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1

Field tests of 2- and 40-tube condensers at the East Mesa Geothermal Test Site  

SciTech Connect

Two water-cooled isobutane condensers, one with 2 tubes and one with 40 tubes, were subjected to field tests at the East Mesa Geothermal Test Site to assess relative heat transfer performance in both surface evaporator and direct-contact evaporator modes. The five groups of tests established that field performance was below earlier laboratory-determined levels and that direct-contact evaporator mode performance was poorer than that for the surface evaporator mode. In all test situations, fluted condenser tubes performed better than smooth condenser tubes. Cooling water quality had no significant effect on performance, but brine preflash in the direct-contact mode did promote some relative performance improvement. Important implications of these results for binary geothermal power plants are that (1) working-fluid-side impurities can significantly degrade heat transfer performance of the power plant condensers and (2) provisions for minimizing such impurities may be required.

Murphy, R.W.; Domingo, N.

1982-05-01

2

East Mesa geothermal pump test facility (EMPTF). Final report  

SciTech Connect

Barber-Nichols has completed the design, fabrication and installation of a geothermal pump test facility at the DOE geothermal site at East Mesa, California which is capable of testing 70 to 750 horsepower downwell pumps in a controlled geothermal environment. The facility consists of a skid-mounted brine control module, a 160 foot below ground test well section, a hydraulic turbine for power recovery, a gantry-mounted hoist for pump handling and a 3-phase, 480 VAC, 1200 amp power supply to handle pump electric requirements. Geothermal brine is supplied to the EMPTF from one of the facility wells at East Mesa. The EMPTF is designed with a great amount of flexibility to attract the largest number of potential users. The 20-inch diameter test well can accommodate a wide variety of pumps. The controls are interactive and can be adjusted to obtain a full complement of pump operation data, or set to maintain constant conditions to allow long-term testing with a minimum of operator support. The hydraulic turbine allows the EMPTF user to recover approximately 46% of the input pump power to help defray the operating cost of the unit. The hoist is provided for material handling and pump servicing and reduces the equipment that the user must supply for pump installation, inspection and removal.

Olander, R.G.; Roberts, G.K.

1984-11-28

3

East Mesa geothermal pump test facility (EMPTF). Final report  

SciTech Connect

The design, fabrication and installation of a geothermal pump test facility (EMPFT) at the DOE geothermal site at East Mesa, California which is capable of testing 70 to 750 horsepower downwell pumps in a controlled geothermal environment were completed. The facility consists of a skid-mounted brine control module, a 160 foot below test well section, a hydraulic turbine for power recovery, a gantry-mounted hoist for pump handling and a 3-phase, 480 VAC, 1200 amp power supply to handle pump electric requirements. Geothermal brine is supplied to the EMPTF from one of the facility wells at East Mesa. The EMPTF is designed with a great amount of flexibility. The 20-inch diameter test well can accommodate a wide variety of pumps. The controls are interactive and can be adjusted to obtain a full complement of pump operation data, or set to maintain constant conditions to allow long-term testing with a minimum of operator support. The hydraulic turbine allows the EMPTF user to recover approximately 46% of the input pump power to help defray the operating cost of the unit. The hoist is provided for material handling and pump servicing and reduces the equipment that the user must supply for pump installation, inspection and removal.

Olander, R.G.; Roberts, G.K.

1984-11-28

4

Tunnel detection using the radio imaging method at the Otay Mesa site  

Microsoft Academic Search

We demonstrated that radio imaging method (RIM) surface-to- surface, borehole-to-surface, and borehole-to-borehole sensing technologies at the Otay Mesa test site east of San Diego, CA could detect and delineate a horizontal 4 X 6-foot (cross- section) tunnel buried at a depth of approximately 45 feet. Utilizing monochromatic, continuous wave electromagnetic signals from a magnetic dipole source operating in the range

Kenneth D. Mahrer; William A. Mondt

1994-01-01

5

Paleostress investigation near Rainier Mesa, Nevada Test Site  

Microsoft Academic Search

Knowledge of the fault-kinematic and paleostress histories in the Rainier Mesa\\/Yucca Flat region can be beneficial to containment scientists in understanding the effects of natural faults on containment of nuclear detonations. Fault-slip data were collected from 444 small-displacement (0.1--10 m) faults cutting 16-11 Ma tuffs and tuffaceous sedimentary rocks in nine areas mainly along the south, east, and northeast flanks

Minor

1989-01-01

6

Recent Changes in Ground Deformation at the East Mesa Geothermal Field, California as Measured by InSAR  

NASA Astrophysics Data System (ADS)

The East Mesa Geothermal Field in East Mesa, Imperial County, California is a series of 6 geothermal power plants with a 57MW capacity that has been in operation since 1987. Previous InSAR studies using ERS-1 and ERS-2 data (1992-2001) have observed ongoing subsidence at rates between -32 to -43 mm/yr. The observed subsidence at this site was thought to be caused by reservoir compaction since there was a negative net production of water during that time period. However, even though net production remained negative, more recent Envisat data reveal a shift in the subsidence signal towards the north and onset of relative uplift in the south portion of the geothermal field starting in 2006. We examine three datasets over East Mesa, including 57 descending ERS-1 and ERS-2 SAR images as well as 35 ascending and 48 descending Envisat SAR acquisitions, to create more than 900 interferograms over the 18 year time period (1992-2010). This dense temporal coverage is valuable for evaluating variations in deformation patterns and minimizing the contribution from the atmosphere. A modified version of the small baseline subset (SBAS) method is used to generate time series of ground displacements and average velocities. ERS data are consistent with previous studies showing rates between -30 and -40 mm/year in the line-of-sight while the Envisat time series' show line-of-sight rates of -20 mm/yr and 12 mm/yr for maximum subsidence and uplift. Net production at the East Mesa Geothermal Field is calculated using production and injection data provided by the California Department of Conservation. The average net production is estimated as -383,000 metric tons per month over the time span of Envisat data and remained negative even during the onset of relative uplift.

Taylor, H.; Pritchard, M. E.; Lohman, R. B.

2013-12-01

7

Geothermal Reservoir Energy Recovery : A Three-Dimensional Simulation Study of the East Mesa Field  

Microsoft Academic Search

A description is given of the reservoir simulation model developed for East Mesa field properties and summarizes the reservoir engineering evaluation of the reserves and field performance. Geothermal reservoirs should be evaluated in terms of efficient ''energy mining'' rather than fluid recovery. The results indicate the behavior of the field under various scenarios of development designed to operate a 64-MW

Charles Morris; Don Campbell

1981-01-01

8

Land subsidence caused by the East Mesa geothermal field, California, observed using SAR interferometry  

Microsoft Academic Search

Interferometric combination of pairs of synthetic aperture radar (SAR) images acquired by the ERS-1 satellite maps the deformation field associated with the activity of the East Mesa geothermal plant, located in southern California. SAR interferometry is applied to this flat area without the need of a digital terrain model. Several combinations are used to ascertain the nature of the phenomenon.

Didier Massonnet; Thomas Holzer; Hélène Vadon

1997-01-01

9

New fusulinids from Lower Permian turbidites at Conglomerate Mesa, southeastern inyo Mountains, east-central California  

USGS Publications Warehouse

Seven previously unrecognized fusulinid species from Lower Permian (Wolfcampian and Leonardian) turbidites near Conglomerate Mesa in east-central California, four of which are named as new species, are here described and figured. The four new species are Schwagerina merriami, S. wildei, Parafusulina mackevetti, and Skinnerella rossi. These fusulinid species have close affinities to similar taxa in Texas and northeastern Nevada, and they are distinct from some other faunas of slightly different age in the Conglomerate Mesa area that are dominated by endemic species and other species with Eastern Klamath Mountains affinities.

Stevens, C.H.; Stone, P.

2009-01-01

10

Actinide Sorption in Rainier Mesa Tunnel Waters from the Nevada Test Site  

Microsoft Academic Search

The sorption behavior of americium (Am), plutonium (Pu), neptunium (Np), and uranium (U) in perched Rainier Mesa tunnel water was investigated. Both volcanic zeolitized tuff samples and groundwater samples were collected from Rainier Mesa, Nevada Test Site, NV for a series of batch sorption experiments. Sorption in groundwater with and without the presence of dissolved organic matter (DOM) was investigated.

P Zhao; M Zavarin; R Leif; B Powell; M Singleton; R Lindvall; A Kersting

2007-01-01

11

Nature and extent of lava-flow aquifers beneath Pahute Mesa, Nevada Test Site  

SciTech Connect

Work is currently underway within the Underground Test Area subproject of the US Department of Energy/Nevada Operations Office Environmental Restoration Program to develop corrective action plans in support of the overall corrective action strategy for the Nevada Test Site as established in the Federal Facility Agreement and Consent Order (FFACO, 1996). A closure plan is currently being developed for Pahute Mesa, which has been identified in the FFACO as consisting of the Western and Central Pahute Mesa Corrective Action Units. Part of this effort requires that hydrogeologic data be compiled for inclusion in a regional model that will be used to predict a contaminant boundary for these Corrective Action Units. Hydrogeologic maps have been prepared for use in the model to define the nature and extent of aquifers and confining units that might influence the flow of contaminated groundwater from underground nuclear tests conducted at Pahute Mesa. Much of the groundwater flow beneath Pahute Mesa occurs within lava-flow aquifers. An understanding of the distribution and hydraulic character of these important hydrogeologic units is necessary to accurately model groundwater flow beneath Pahute Mesa. This report summarizes the results of a study by Bechtel Nevada geologists to better define the hydrogeology of lava-flow aquifers at Pahute Mesa. The purpose of this study was twofold: (1) aid in the development of the hydrostratigraphic framework for Pahute Mesa, and (2) provide information on the distribution and hydraulic character of lava-flow aquifers beneath Pahute Mesa for more accurate computer modeling of the Western and Central Pahute Mesa Corrective Action Units.

Prothro, L.B.; Drellack, S.L. Jr.

1997-09-01

12

Land subsidence caused by the East Mesa geothermal field, California, observed using SAR interferometry  

USGS Publications Warehouse

Interferometric combination of pairs of synthetic aperture radar (SAR) images acquired by the ERS-1 satellite maps the deformation field associated with the activity of the East Mesa geothermal plant, located in southern California. SAR interferometry is applied to this flat area without the need of a digital terrain model. Several combinations are used to ascertain the nature of the phenomenon. Short term interferograms reveal surface phase changes on agricultural fields similar to what had been observed previously with SEASAT radar data. Long term (2 years) interferograms allow the study of land subsidence and improve prior knowledge of the displacement field, and agree with existing, sparse levelling data. This example illustrates the power of the interferometric technique for deriving accurate industrial intelligence as well as its potential for legal action, in cases involving environmental damages. Copyright 1997 by the American Geophysical Union.

Massonnet, D.; Holzer, T.; Vadon, H.

1997-01-01

13

Pollen analysis of Anasazi sites at Black Mesa, Arizona  

E-print Network

etation Most of the study area is composed of a mosaic of pinyon pine (Pi ss d lis) and ) incr (p f ily ~dani r s ~steps er ) t nds on rock and mineral soil ridges and higher ground, together comprising the pinyon-juniper woodland vegetation zone. A... for species other than pine and juniper are currently unavailable for most of the samples in this study. The pine and juni per ratios from Dead Juniper Wash, along with geomorphological, hydrological and tree 2I ring data from Black Mesa have been...

Murry, Robert Earl

2012-06-07

14

Internal Technical Report, Hydrothermal Injection Program - East Mesa 1983-84 Test Data  

SciTech Connect

This report presents a test data index and a data plots for a series of 12 drawdown and tracer injection-withdrawal tests in porous-media aquifers at the East Mesa Geothermal Field located in the Imperial Valley near El Centro, California. Test and instrumentation summaries are also provided. The first 10 of these tests were completed during July and August 1983. The remaining 2 tests were completed in February 1984, after a 6-month quiescent period, in which tracers were left in the reservoir. The test wells used were 56-30 and 56-19, with 38-30 supplying water for the injection phase and 52-29 used as a disposal well during the backflowing of the test wells. Six other wells in the surrounding area were measured periodically for possible hydrologic effects during testing. It is not the intent of this report to supply analyzed data, but to list the uninterpreted computer stored data available for analysis. The data have been examined only to the extent to ensure that they are reasonable and internally consistent. This data is stored on permanent files at the Idaho National Engineering Laboratory (INEL) Cyber Computer Complex. The main processors for this complex are located at the Computer Science Center (CSC) in Idaho Falls, Idaho. The Hydrothermal Injection Test program, funded by the Department of Energy, was a joint effort between EG and G Idaho, Inc., the University of Utah Research Institute (UURI) and Republic Geothermal, Inc. (RGI) of Santa Fe Springs, California.

Freiburger, R.M.

1984-09-01

15

New permian fusulinids from conglomerate mesa, southeastern inyo Mountains, east-central california  

USGS Publications Warehouse

In the Conglomerate Mesa area in the southeastern Inyo Mountains, east-central California, a series of distinctive fusulinid assemblages ranging in age from late Artinskian to Kungurian or Roadian was developed in units 7-10 of the sedimentary rocks of Santa Rosa Flat (part of the Owens Valley Group). The fauna of unit 7 shows some eastern Klamath Mountains affinity, but most of the species in unit 7 and the lower half of unit 8 are highly endemic and comprise three new genera with 12 new species, two unusual unassigned forms, and two other new species assigned to previously described genera. New taxa include: Crenulosepta new genus with five new species, C. inyoensis, C. delicata, C. fusiformis, C. rossi, and C. wahlmani; Nigribaccinus new genus with three new species, N. giganteus, N. elegans, and N. ? nestelli; and the new genus Inyoschwagerina with four new species, I. magnified, I. elayeri, I. elongata, and I.? linderae. Cuniculinella Skinner and Wilde, 1965, is represented by one new species, C. parva, and Skinnerella Coogan, 1960 by one new species, S.? mcallisteri. Faunas from the upper half of unit 8, unit 9, and unit 10 have a strong West Texas affinity. New species from these units are Skinnerella davydovi, S. hexagona, Parafusulina cerrogordoensis, P. complexa, P. halli, P. owensensis, and P. ubehebensis. Copyright ?? 2009, The Paleontological Society.

Stevens, C.H.; Stone, P.

2009-01-01

16

Deep Vadose Zone Flow and Transport Behavior at T-Tunnel Complex, Rainier Mesa, Nevada National Security Site  

Microsoft Academic Search

Rainier Mesa, a tuffaceous plateau on the Nevada National Security Site, has been the location of numerous subsurface nuclear tests conducted in a series of tunnel complexes located approximately 450 m below the top of the mesa and 500 m above the regional groundwater flow system. The tunnels were constructed near the middle of an 800 m Tertiary sequence of

R. Parashar; D. M. Reeves

2010-01-01

17

Perched Ground Water in Zeolitized-Bedded Tuff, Rainier Mesa and Vicinity, Nevada Test Site, Nevada  

USGS Publications Warehouse

Rainier Mesa--site of the first series of underground nuclear detonations--is the highest of a group of ridges and mesas within the Nevada Test Site. The mesa is about 9.5 square miles in area and reaches a maximum altitude of 7,679 feet. The mesa is underlain by welded tuff, friable-bedded tuff, and zeolitized-bedded tuff of the Piapi Canyon Group and the Indian Trail Formation of Tertiary age. The tuff--2,000 to 9,000 feet thick--rests unconformably upon thrust-faulted miogeosynclinal rocks of Paleozoic age. Zeolitic-bedded tuff at the base of the tuff sequence controls the recharge rate of ground water to the underlying and more permeable Paleozoic aquifers. The zeolitic tuff--600 to 800 feet thick--is a fractured aquitard with high interstitial porosity, but with very low interstitial permeability and fracture transmissibility. The interstitial porosity ranges from 29 to 38 percent, the interstitial permeability is generally less than 0.009 gpd/ft3, and the fracture transmissibility ranges from 10 to 100 gpd/ft for 900 feet of saturated rock. The tuff is generally fully saturated interstitially hundreds of feet above the regional water table, yet no appreciable volume of water moves through the interstices because of the very low permeability. The only freely moving water observed in miles of underground workings occurred in fractures, usually fault zones.

Thordarson, William

1965-01-01

18

Sourcebook of locations of geophysical surveys in tunnels and horizontal holes including results of seismic-refraction surveys: Rainier Mesa, Aqueduct Mesa, and Area 16, Nevada Test Site  

Microsoft Academic Search

Seismic refraction surveys have been obtained sporadically in tunnels in zeolitized tuff at the Nevada Test Site since the late 1950's. Commencing in 1967 and continuing to date (1982), extensive measurements of shear- and compressional-wave velocities have been made in five tunnel complexes in Rainier and Aqueduct Mesas and in one tunnel complex in Shoshone Mountain. The results of these

R. D. Carroll; J. E. Kibler

1983-01-01

19

Mesa = Table  

NASA Technical Reports Server (NTRS)

10 August 2006 This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows two mesas on the northern plains of Mars. 'Mesa' is the Spanish word for 'table,' and that is a very good description of the two elliptical features captured in this MOC image. In both cases, the mesa tops and the material beneath them, down to the level of the surrounding, rugged plain, are remnants of a once more extensive layer (or layers) of material that has been largely eroded away. The circular feature near the center of the larger mesa is the site of a filled and buried impact crater.

Location near: 53.5oN, 153.5oW Image width: 3 km (1.9 mi) Illumination from: lower left Season: Northern Spring

2006-01-01

20

Bacterial heterogeneity in deep subsurface tunnels at Rainier Mesa, Nevada test site  

Microsoft Academic Search

To characterize the deep subsurface environment of Rainier Mesa, Nevada Test Site, rock samples were taken from tunnels U 12b, U12g, U12p, and U 12n, which varied in depth from 50 m to 450 m and in gravimetric moisture content from 4% to 27%. Values for total count, viable count, biomass, Simpson diversity, equitability, similarity coefficient, and number of distinct

D. L. Haldeman; P. S. Amy

1993-01-01

21

Actinide Sorption in Rainier Mesa Tunnel Waters from the Nevada Test Site  

SciTech Connect

The sorption behavior of americium (Am), plutonium (Pu), neptunium (Np), and uranium (U) in perched Rainier Mesa tunnel water was investigated. Both volcanic zeolitized tuff samples and groundwater samples were collected from Rainier Mesa, Nevada Test Site, NV for a series of batch sorption experiments. Sorption in groundwater with and without the presence of dissolved organic matter (DOM) was investigated. Am(III) and Pu(IV) are more soluble in groundwater that has high concentrations of DOM. The sorption K{sub d} for Am(III) and Pu(IV) on volcanic zeolitized tuff was up to two orders of magnitude lower in samples with high DOM (15 to 19 mg C/L) compared to samples with DOM removed (< 0.4 mg C/L) or samples with naturally low DOM (0.2 mg C/L). In contrast, Np(V) and U(VI) sorption to zeolitized tuff was much less affected by the presence of DOM. The Np(V) and U(VI) sorption Kds were low under all conditions. Importantly, the DOM was not found to significantly sorb to the zeolitized tuff during these experiment. The concentration of DOM in groundwater affects the transport behavior of actinides in the subsurface. The mobility of Am(III) and Pu(IV) is significantly higher in groundwater with elevated levels of DOM resulting in potentially enhanced transport. To accurately model the transport behavior of actinides in groundwater at Rainier Mesa, the low actinide Kd values measured in groundwater with high DOM concentrations must be incorporated in predictive transport models.

Zhao, P; Zavarin, M; Leif, R; Powell, B; Singleton, M; Lindvall, R; Kersting, A

2007-12-17

22

Geologic Surface Effects of Underground Nuclear Testing, Buckboard Mesa, Climax Stock, Dome Mountain, Frenchman Flat, Rainier/Aqueduct Mesa, and Shoshone Mountain, Nevada Test Site, Nevada  

USGS Publications Warehouse

Surface effects maps were produced for 72 of 89 underground detonations conducted at the Frenchman Flat, Rainier Mesa and Aqueduct Mesa, Climax Stock, Shoshone Mountain, Buckboard Mesa, and Dome Mountain testing areas of the Nevada Test Site between August 10, 1957 (Saturn detonation, Area 12) and September 18, 1992 (Hunters Trophy detonation, Area 12). The ?Other Areas? Surface Effects Map Database, which was used to construct the maps shown in this report, contains digital reproductions of these original maps. The database is provided in both ArcGIS (v. 8.2) geodatabase format and ArcView (v. 3.2) shapefile format. This database contains sinks, cracks, faults, and other surface effects having a combined (cumulative) length of 136.38 km (84.74 mi). In GIS digital format, the user can view all surface effects maps simultaneously, select and view the surface effects of one or more sites of interest, or view specific surface effects by area or site. Three map layers comprise the database. They are: (1) the surface effects maps layer (oase_n27f), (2) the bar symbols layer (oase_bar_n27f), and (3) the ball symbols layer (oase_ball_n27f). Additionally, an annotation layer, named 'Ball_and_Bar_Labels,' and a polygon features layer, named 'Area12_features_poly_n27f,' are contained in the geodatabase version of the database. The annotation layer automatically labels all 295 ball-and-bar symbols shown on these maps. The polygon features layer displays areas of ground disturbances, such as rock spall and disturbed ground caused by the detonations. Shapefile versions of the polygon features layer in Nevada State Plane and Universal Transverse Mercator projections, named 'area12_features_poly_n27f.shp' and 'area12_features_poly_u83m.shp,' are also provided in the archive.

Grasso, Dennis N.

2003-01-01

23

Hydraulic Property and Soil Textural Classification Measurements for Rainier Mesa, Nevada Test Site, Nevada  

SciTech Connect

This report presents particle size analysis, field-saturated hydraulic conductivity measurements, and qualitative descriptions of surficial materials at selected locations at Rainier Mesa, Nevada. Measurements and sample collection were conducted in the Rainier Mesa area, including unconsolidated sediments on top of the mesa, an ephemeral wash channel near the mesa edge, and dry U12n tunnel pond sediments below the mesa. Particle size analysis used a combination of sieving and optical diffraction techniques. Field-saturated hydraulic conductivity measurements employed a single-ring infiltrometer with analytical formulas that correct for falling head and spreading outside the ring domain. These measurements may prove useful to current and future efforts at Rainier Mesa aimed at understanding infiltration and its effect on water fluxes and radionuclide transport in the unsaturated zone.

Ebel, Brian A.; Nimmo, John R.

2009-12-29

24

Hydraulic Property and Soil Textural Classification Measurements for Rainier Mesa, Nevada Test Site, Nevada  

USGS Publications Warehouse

This report presents particle size analysis, field-saturated hydraulic conductivity measurements, and qualitative descriptions of surficial materials at selected locations at Rainier Mesa, Nevada. Measurements and sample collection were conducted in the Rainier Mesa area, including unconsolidated sediments on top of the mesa, an ephemeral wash channel near the mesa edge, and dry U12n tunnel pond sediments below the mesa. Particle size analysis used a combination of sieving and optical diffraction techniques. Field-saturated hydraulic conductivity measurements employed a single-ring infiltrometer with analytical formulas that correct for falling head and spreading outside the ring domain. These measurements may prove useful to current and future efforts at Rainier Mesa aimed at understanding infiltration and its effect on water fluxes and radionuclide transport in the unsaturated zone.

Ebel, Brian A.; Nimmo, John R.

2010-01-01

25

The spatial and temporal subsidence variability of the East Mesa Geothermal Field, California, USA, and its potential impact on the All American Canal System  

Microsoft Academic Search

The spatiotemporal variability of subsidence around the East Mesa Geothermal Field (EMGF) near the All American Canal (AAC) has been measured using 30 temporally averaged interferograms from 1992 to 2000. Deformation rate maps from two shorter time periods indicated the maximum subsidence rate of the EMGF was reduced from??43 mm year (1992–1997) to??34 mm year (1996–2000) corresponding to decreasing net

Joo-Yup Han; R. R. Forster; D. E. Moser; A. L. J. Ford; J. Ramírez-Hernández; K. F. Tiampo

2011-01-01

26

Predictions of Long-Term Radionuclide Transport at Rainier Mesa, Nevada National Security Site  

NASA Astrophysics Data System (ADS)

Rainier Mesa, a tuffaceous plateau on the Nevada National Security Site, has been the location of numerous subsurface nuclear tests conducted in a series of tunnel complexes located approximately 400 m below the top of the mesa and 400 m above the regional groundwater flow system. The tunnels were constructed near the middle of an 800 m Tertiary sequence of faulted, low-permeability welded and non-welded bedded, vitric, and zeolitized tuff units. Water levels from wells in the vicinity of both the N- and T-tunnel complexes indicate the presence of two saturated zones. The first saturated zone has an elevation of approximately 1800 m (300 mbgs) and is located 100 m above the T-tunnel complex. Water level measurements during well construction and borehole moisture profiles of matrix saturation suggest this upper zone of saturation extends downward through most of the Tertiary sequence, though data is not available for the lowest Tertiary units. The second saturated zone is located at an elevation of 1300 m (800 mbgs) within a thrust sheet of Paleozoic carbonates and may be hydraulically connected to the Death Valley regional flow system. This study evaluates the potential for downward radionuclide transport associated with six underground tests at the T-tunnel complex over a 1000 year period. A dual-permeability (DKM) model containing spatially discontinuous fault networks within low-permeability tuff units is utilized to simulate complex patterns of variably-saturated flow. A modified random walk particle tracking code for DKM velocity fields is then used to compute radionuclide breakthrough at the regional water table (second saturated zone). Results include calibration of a variably-saturated model to field observations including water discharge history at the tunnel portal, variably-saturated fault fields, water levels in perched intervals and differential saturations in the volcanics and carbonates; and predictions of radionuclide breakthrough at the regional water table given uncertainty in fault network geometry, fault hydraulic properties, recharge and radionuclide adsorption and diffusion.

Reeves, D. M.; Parashar, R.; Pohlmann, K. F.; LaBolle, E. M.; Zhang, Y.; Russell, C. E.; Chapman, J. B.

2011-12-01

27

Sourcebook of locations of geophysical surveys in tunnels and horizontal holes including results of seismic-refraction surveys: Rainier Mesa, Aqueduct Mesa, and Area 16, Nevada Test Site  

SciTech Connect

Seismic refraction surveys have been obtained sporadically in tunnels in zeolitized tuff at the Nevada Test Site since the late 1950's. Commencing in 1967 and continuing to date (1982), extensive measurements of shear- and compressional-wave velocities have been made in five tunnel complexes in Rainier and Aqueduct Mesas and in one tunnel complex in Shoshone Mountain. The results of these surveys to 1980 are compiled in this report. In addition, extensive horizontal drilling was initiated in 1967 in connection with geologic exploration in these tunnel complexes for sites for nuclear weapons tests. Seismic and electrical surveys were conducted in the majority of these holes. The type and location of these tunnel and borehole surveys are indexed in this report. Synthesis of the seismic refraction data indicates a mean compressional-wave velocity near the nuclear device point (WP) of 23 tunnel events of 2430 m/s (7970 f/s) with a range of 1846 to 2753 m/s (6060 to 9030 f/s). The mean shear-wave velocity of 17 tunnel events is 1276 m/s (4190 f/s) with a range of 1140 to 1392 m/s (3740 to 4570 f/s). Experience indicates that these velocity variations are due chiefly to the extent of fracturing and (or) the presence of partially saturated rock in the region of the survey.

Carroll, R.D.; Kibler, J.E.

1983-01-01

28

Shear-wave velocity measurements in volcanic tuff in Rainier Mesa tunnels, Nevada Test Site, Nevada  

Microsoft Academic Search

The identification of shear-wave arrivals on records obtained in the course of seismic surveys in Rainier Mesa tunnels is not generally confirmed using the standard technique of polarization of the waveform by manipulation of the source. Identification of the shear wave is based on recognition of a dominant mode on the record arriving in the shear-wave time window. This requires

1986-01-01

29

Electric logging and electrical properties of rocks in Rainier Mesa area, Nevada Test Site, Nevada  

Microsoft Academic Search

Electric logs obtained in 33 drill holes in the Rainier Mesa region were evaluated. Aside from the usual character correlations associated with densely welded tuffs, correlations over considerable distances in the ash-fall tuffs may be noted at the horizons of tunnel bed subunits 4J and 3D, and at the contact of tunnel bed subunit 3A and the Tub Spring Member

1990-01-01

30

site plan, floor plan, southeast and east elevations, detail showing ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

site plan, floor plan, southeast and east elevations, detail showing original front entrance, interior detail showing fireplace in elevation - Neiman House, 1930 Providence Road, Charlotte, Mecklenburg County, NC

31

Data Report: Meteorological and Evapotranspiration Data from Sagebrush and Pinyon Pine/Juniper Communities at Pahute Mesa, Nevada National Security Site, 2011-2012  

SciTech Connect

Pahute Mesa is a groundwater recharge area at the Nevada National Security Site. Because underground nuclear testing was conducted at Pahute Mesa, groundwater recharge may transport radionuclides from underground test sites downward to the water table; the amount of groundwater recharge is also an important component of contaminant transport models. To estimate the amount of groundwater recharge at Pahute Mesa, an INFIL3.0 recharge-runoff model is being developed. Two eddy covariance (EC) stations were installed on Pahute Mesa to estimate evapotranspiration (ET) to support the groundwater recharge modeling project. This data report describes the methods that were used to estimate ET and collect meteorological data. Evapotranspiration was estimated for two predominant plant communities on Pahute Mesa; one site was located in a sagebrush plant community, the other site in a pinyon pine/juniper community. Annual ET was estimated to be 310±13.9 mm for the sagebrush site and 347±15.9 mm for the pinyon pine/juniper site (March 26, 2011 to March 26, 2012). Annual precipitation measured with unheated tipping bucket rain gauges was 179 mm at the sagebrush site and 159 mm at the pinyon pine/juniper site. Annual precipitation measured with bulk precipitation gauges was 222 mm at the sagebrush site and 227 mm at the pinyon pine/juniper site (March 21, 2011 to March 28, 2012). A comparison of tipping bucket versus bulk precipitation data showed that total precipitation measured by the tipping bucket rain gauges was 17 to 20 percent lower than the bulk precipitation gauges. These differences were most likely the result of the unheated tipping bucket precipitation gauges not measuring frozen precipitation as accurately as the bulk precipitation gauges. In this one-year study, ET exceeded precipitation at both study sites because estimates of ET included precipitation that fell during the winter of 2010-2011 prior to EC instrumentation and the precipitation gauges started collecting data in March 2011.

Jasoni, Richard L [DRI; Larsen, Jessica D [DRI; Lyles, Brad F. [DRI; Healey, John M [DRI; Cooper, Clay A [DRI; Hershey, Ronald L [DRI; Lefebre, Karen J [DRI

2013-04-01

32

In situ stress measured at Rainier Mesa, Nevada, and a few geologic implications  

Microsoft Academic Search

Measurements of the three dimensional stress field were obtained in tunnels driven in Tertiary ash fall tuff under Rainier Mesa at the Nevada Test Site. The sites are distributed under an area of 17 sq km and are at an average depth of 389 m. Whereas maximum compression during late Precambrian to Tertiary time remained essentially east-west, a complete reversal

J. R. Ege

1977-01-01

33

Development of Phenomenological Models of Underground Nuclear Tests on Pahute Mesa, Nevada Test Site - BENHAM and TYBO  

SciTech Connect

Although it is well accepted that underground nuclear explosions modify the in situ geologic media around the explosion point, the details of these changes are neither well understood nor well documented. As part of the engineering and containment process before a nuclear test, the physical environment is characterized to some extent to predict how the explosion will interact with the in situ media. However, a more detailed characterization of the physical environment surrounding an expended site is needed to successfully model radionuclide transport in the groundwater away from the detonation point. It is important to understand how the media have been altered and where the radionuclides are deposited. Once understood, this information on modified geologic media can be incorporated into a phenomenological model that is suitable for input to computer simulations of groundwater flow and radionuclide transport. The primary goals of this study are to (1) identify the modification of the media at a pertinent scale, and (2) provide this information to researchers modeling radionuclide transport in groundwater for the US Department of Energy (DOE) Nevada Operations Office Underground Test Area (UGTA) Project. Results from this study are most applicable at near-field scale (a model domain of about 500 m) and intermediate-field scale (a model domain of about 5 km) for which detailed information can be maximized as it is incorporated in the modeling grids. UGTA collected data on radionuclides in groundwater during recent drilling at the ER-20-5 site, which is near BENHAM and TYBO on Pahute Mesa at the Nevada Test Site (NTS). Computer simulations are being performed to better understand radionuclide transport. The objectives of this modeling effort include: evaluating site-specific information from the BENHAM and TYBO tests on Pahute Mesa; augmenting the above data set with generalized containment data; and developing a phenomenological model suitable for input to groundwater flow and transport modeling efforts that describes the physical in situ environment after the BENHAM and TYBO nuclear explosions.

Pawloski, G.A.

1999-09-21

34

Site disturbance from intensive forestry practices in East Texas  

E-print Network

as to what effects these practices have on the forest sites. Cne area of concern is the physical site disturbances that occur during logging and site preparation. Tree seedlings must have a favorable physical environ- ment for optimum growth. Water... harvest cut on forest land in East Texas by regeneration system (Blackburn et al. 1981). Estimated acres of East Texas forest land receiving a site preparation treatment annually (Blackburn et al. 1981). Soil series of each watershed and the percent...

Crawley, Walter Wayne

1982-01-01

35

Skirted Mesa  

NASA Technical Reports Server (NTRS)

21 June 2006 This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows a portion of a mesa in eastern Candor Chasma. The mesa appears to be composed of at least two different rock types based on the near-vertical appearance of the scarps which define the top portion of the mesa and the gentler slopes that extend down to where the base of the mesa meets the chasm floor. The uppermost rock unit is more resistant to erosion, and thus is harder.

Location near: 7.6oS, 65.5oW Image width: 2 km (1.2 mi) Illumination from: upper left Season: Southern Summer

2006-01-01

36

The origin of elevated water levels in emplacement boreholes, Pahute Mesa, Nevada Test Site: A numerical study  

SciTech Connect

The origin of elevated water levels in emplacement boreholes at Pahute Mesa, Nevada Test Site, is uncertain. If the water is from naturally perched aquifers, then presumed ``above water table`` weapons tests may directly impact the groundwater quality. The purpose of this study is to determine the probable source of the elevated water in boreholes by comparing modeled seepage of infiltrated drilling fluids, and the seepage from a simulated naturally perched aquifer with the observed water level history. In the model, large volumes of water are infiltrated, yet return flow of fluids back into the hole stops within three days after the end of drilling and is insufficient to produce observed standing water. Return flow is limited for two reasons: (1) the volume of the saturated rock next to the borehole is small; (2) pressure head gradient direct unsaturated flow away from the borehole. Simulation of seepage from a naturally perched aquifer readily reproduces the observed water levels.

Gardner, G.G.; Brikowski, T.H.

1993-12-01

37

Summary of micrographic analysis of fracture coating phases on drill cores from Pahute Mesa, Nevada Test Site. Revision 1  

SciTech Connect

The flow path between Pahute Mesa and the groundwater discharge area in Oasis Valley (approximately 18 miles to the southwest) is of concern due to the relatively short travel distance between a recharge area where underground nuclear testing has been conducted and the off-site water users. Groundwater flow and transport modeling by IT Corporation (IT) has shown rapid tritium transport in the volcanic rock aquifers along this flow path. The resultant estimates of rapid transport were based on water level data, limited hydraulic conductivity data, estimates of groundwater discharge rates in Oasis Valley, assumed porosities, and estimated retardation rates. Many of these parameters are poorly constrained and may vary considerably. Sampling and analytical techniques are being applied as an independent means to determine transport rates by providing an understanding of the geochemical processes that control solute movement along the flow path. As part of these geochemical investigations, this report summarizes the analysis of fracture coating mineral phases from drill core samples from the Pahute mesa area of the Nevada Test Site (NTS). Archived samples were collected based on the presence of natural fractures and on the types and abundance of secondary mineral phases present on those fracture surfaces. Mineral phases present along fracture surfaces are significant because, through the process of water-rock interaction, they can either contribute (as a result of dissolution) or remove (as a result of precipitation or adsorption) constituents from solution. Particular attention was paid to secondary calcite occurrences because they represent a potential source of exchangeable carbon and can interact with groundwater resulting in a modified isotopic signature and apparent water age.

NONE

1998-12-01

38

Value of information analysis for Corrective Action Unit Nos. 101 and 102: Central and western Pahute Mesa, Nevada Test Site, Nevada  

SciTech Connect

The purpose of this report is to describe the basis for and present the results of a value of information analysis (VOIA) for the Pahute Mesa underground test area of the Nevada Test Site (NTS), one of several areas of the Nevada Test Site used for underground nuclear testing in the past. The value of information analysis was used to evaluate and compare potential characterization options at the Pahute Mesa underground test area for site remediation purposes. Thirty six characterization options were evaluated, ranging from a single, inexpensive study using existing data and intended to address a single question or uncertainty, to a forty-million-dollar suite of activities designed to collect and analyze new information to address multiple uncertainties. The characterization options were compared and ranked based on how effective the experts though the information collection would be in reducing uncertainties, how this effected the distance to contaminant boundary, and the cost of the option.

NONE

1998-09-01

39

Database of Ground-Water Levels in the Vicinity of Rainier Mesa, Nevada Test Site, Nye County, Nevada 1957-2005.  

SciTech Connect

More than 1,200 water-level measurements from 1957 to 2005 in the Rainier Mesa area of the Nevada Test Site were quality assured and analyzed. Water levels were measured from 50 discrete intervals within 18 boreholes and from 4 tunnel sites. An interpretive database was constructed that describes water-level conditions for each water level measured in the Rainier Mesa area. Multiple attributes were assigned to each water-level measurement in the database to describe the hydrologic conditions at the time of measurement. General quality, temporal variability, regional significance, and hydrologic conditions are attributed for each water-level measurement. The database also includes hydrograph narratives that describe the water-level history of each well.

Joseph M. Fenelon

2006-08-15

40

Database of Ground-Water Levels in the Vicinity of Rainier Mesa, Nevada Test Site, Nye County, Nevada, 1957-2005  

USGS Publications Warehouse

More than 1,200 water-level measurements from 1957 to 2005 in the Rainier Mesa area of the Nevada Test Site were quality assured and analyzed. Water levels were measured from 50 discrete intervals within 18 boreholes and from 4 tunnel sites. An interpretive database was constructed that describes water-level conditions for each water level measured in the Rainier Mesa area. Multiple attributes were assigned to each water-level measurement in the database to describe the hydrologic conditions at the time of measurement. General quality, temporal variability, regional significance, and hydrologic conditions are attributed for each water-level measurement. The database also includes hydrograph narratives that describe the water-level history of each well.

Fenelon, Joseph M.

2006-01-01

41

The Underground Test Area Project of the Nevada Test Site: Building Confidence in Groundwater Flow and Transport Models at Pahute Mesa Through Focused Characterization Studies  

SciTech Connect

Pahute Mesa at the Nevada Test Site contains about 8.0E+07 curies of radioactivity caused by underground nuclear testing. The Underground Test Area Subproject has entered Phase II of data acquisition, analysis, and modeling to determine the risk to receptors from radioactivity in the groundwater, establish a groundwater monitoring network, and provide regulatory closure. Evaluation of radionuclide contamination at Pahute Mesa is particularly difficult due to the complex stratigraphy and structure caused by multiple calderas in the Southwestern Nevada Volcanic Field and overprinting of Basin and Range faulting. Included in overall Phase II goals is the need to reduce the uncertainty and improve confidence in modeling results. New characterization efforts are underway, and results from the first year of a three-year well drilling plan are presented.

Pawloski, G A; Wurtz, J; Drellack, S L

2009-12-29

42

Stockholm Institute of Transition Economics and East European Economies (SITE)  

NSDL National Science Digital Library

The Stockholm Institute of Transition Economics and East European Economies (SITE/ÃÂstekonomiska Institutet) is an independent research institute at the Stockholm School of Economics. SITE is concerned with the transition from planned to market economies in Eastern Europe and the former Soviet Union. Academic research on-site includes a bibliography of recent working papers (1990-present), with most papers from 1998 available for download [.pdf]. Monthly updates of key indicators discussed in the quarterly SITE publication Russian Economic Trends (RET) are also available [.pdf] in addition to RET subscription information and other discussion channels.

43

Analysis of fractures in volcanic cores from Pahute Mesa, Nevada Test Site  

SciTech Connect

The Nevada Test Site (NTS), located in Nye County, southern Nevada, was the location of 828 announced underground nuclear tests, conducted between 1951 and 1992. Approximately one-third of these tests were detonated near or below the water table. An unavoidable consequence of these testing activities was introducing radionuclides into the subsurface environment, impacting groundwater. Groundwater flows beneath the NTS almost exclusively through interconnected natural fractures in carbonate and volcanic rocks. Information about these fractures is necessary to determine hydrologic parameters for future Corrective Action Unit (CAU)-specific flow and transport models which will be used to support risk assessment calculations for the U.S. Department of Energy, Nevada Operations Office (DOE/NV) Underground Test Area (UGTA) remedial investigation. Fracture data are critical in reducing the uncertainty of the predictive capabilities of CAU-specific models because of their usefulness in generating hydraulic conductivity values and dispersion characteristics used in transport modeling. Specifically, fracture aperture and density (spacing) are needed to calculate the permeability anisotropy of the formations. Fracture mineralogy information is used qualitatively to evaluate diffusion and radionuclide retardation potential in transport modeling. All these data can best be collected through examination of core samples.

Drellack, S.L. Jr.; Prothro, L.B.; Roberson, K.E. [and others

1997-09-01

44

Remedial actions at the former Climax Uranium Company, Uranium Mill site, Grand Junction, Mesa County, Colorado. Volume 1, Text: Final environmental impact statement  

SciTech Connect

This statement evaluates and compares the environmental impacts associated with the remedial actions of the residual radioactive materials remaining at the inactive uranium processing site and associated vicinity properties at Grand Junction, Mesa County, Colorado. This statement is also intended to aid the BLM in amending their management framework plans and final resource management plan, as well as assisting in compliance with the withdrawal application as appropriate. The site is a 114-acre tract of private and state owned land which contains approximately 3.1 million cubic yards of tailings and associated contaminated soils. The vicinity properties are homes, businesses, public buildings, and vacant lots which may have been contaminated during construction by the use of tailings as building material. An estimated 3465 vicinity properties would be cleaned up during remedial action of the tailings pile. The tailings were produced by the former Climax Uranium Company which processed uranium ore, which it sold to the US Atomic Energy Commission from 1951 to 1966 and to private sources from 1966 to 1970. This statement evaluates six alternatives for stabilization and disposal of the tailings and other contaminated materials: (1) No action. (2) Stabilization at the Grand Junction site. (3) Disposal at the Cheney Reservoir site with truck transport. (4) Disposal at the Cheney Reservoir site with train and truck transport. (5) Disposal at the Two Road site with truck transport. (6) Disposal at the Two Road site with train and truck transport. All of the alternatives except no action include remedial action at an estimated 3465 vicinity properties. Alternative 3 is DOE`s preferred alternative.

None

1986-12-01

45

Estimation of Unsaturated Zone Traveltimes for Rainier Mesa and Shoshone Mountain, Nevada Test Site, Nevada, Using a Source-Responsive Preferential-Flow Model  

USGS Publications Warehouse

Traveltimes for contaminant transport by water from a point in the unsaturated zone to the saturated zone are a concern at Rainier Mesa and Shoshone Mountain in the Nevada Test Site, Nevada. Where nuclear tests were conducted in the unsaturated zone, contaminants must traverse hundreds of meters of variably saturated rock before they enter the saturated zone in the carbonate rock, where the regional groundwater system has the potential to carry them substantial distances to a location of concern. The unsaturated-zone portion of the contaminant transport path may cause a significant delay, in addition to the time required to travel within the saturated zone, and thus may be important in the overall evaluation of the potential hazard from contamination. Downward contaminant transport through the unsaturated zone occurs through various processes and pathways; this can lead to a broad distribution of contaminant traveltimes, including exceedingly slow and unexpectedly fast extremes. Though the bulk of mobile contaminant arrives between the time-scale end members, the fastest contaminant transport speed, in other words the speed determined by the combination of possible processes and pathways that would bring a measureable quantity of contaminant to the aquifer in the shortest time, carries particular regulatory significance because of its relevance in formulating the most conservative hazard-prevention scenarios. Unsaturated-zone flow is usually modeled as a diffusive process responding to gravity and pressure gradients as mediated by the unsaturated hydraulic properties of the materials traversed. The mathematical formulation of the diffuse-flow concept is known as Richards' equation, which when coupled to a solute transport equation, such as the advection-dispersion equation, provides a framework to simulate contaminant migration in the unsaturated zone. In recent decades awareness has increased that much fluid flow and contaminant transport within the unsaturated zone takes place as preferential flow, faster than would be predicted by the coupled Richards' and advection-dispersion equations with hydraulic properties estimated by traditional means. At present the hydrologic community has not achieved consensus as to whether a modification of Richards' equation, or a fundamentally different formulation, would best quantify preferential flow. Where the fastest contaminant transport speed is what needs to be estimated, there is the possibility of simplification of the evaluation process. One way of doing so is by a two-step process in which the first step is to evaluate whether significant preferential flow and solute transport is possible for the media and conditions of concern. The second step is to carry out (a) a basic Richards' and advection-dispersion equation analysis if it is concluded that preferential flow is not possible or (b) an analysis that considers only the fastest possible preferential-flow processes, if preferential flow is possible. For the preferential-flow situation, a recently published model describable as a Source-Responsive Preferential-Flow (SRPF) model is an easily applied option. This report documents the application of this two-step process to flow through the thick unsaturated zones of Rainier Mesa and Shoshone Mountain in the Nevada Test Site. Application of the SRPF model involves distinguishing between continuous and intermittent water supply to preferential flow paths. At Rainier Mesa and Shoshone Mountain this issue is complicated by the fact that contaminant travel begins at a location deep in the subsurface, where there may be perched water that may or may not act like a continuous supply, depending on such features as the connectedness of fractures and the nature of impeding layers. We have treated this situation by hypothesizing both continuous and intermittent scenarios for contaminant transport to the carbonate aquifer and reporting estimation of the fastest speed for both of th

Ebel, Brian A.; Nimmo, John R.

2009-01-01

46

Estimation of unsaturated zone traveltimes for Rainier Mesa and Shoshone Mountain, Nevada Test Site, Nevada, using a source-responsive preferential-flow model  

SciTech Connect

Traveltimes for contaminant transport by water from a point in the unsaturated zone to the saturated zone are a concern at Rainier Mesa and Shoshone Mountain in the Nevada Test Site, Nevada. Where nuclear tests were conducted in the unsaturated zone, contaminants must traverse hundreds of meters of variably saturated rock before they enter the saturated zone in the carbonate rock, where the regional groundwater system has the potential to carry them substantial distances to a location of concern. The unsaturated-zone portion of the contaminant transport path may cause a significant delay, in addition to the time required to travel within the saturated zone, and thus may be important in the overall evaluation of the potential hazard from contamination. Downward contaminant transport through the unsaturated zone occurs through various processes and pathways; this can lead to a broad distribution of contaminant traveltimes, including exceedingly slow and unexpectedly fast extremes. Though the bulk of mobile contaminant arrives between the time-scale end members, the fastest contaminant transport speed, in other words the speed determined by the combination of possible processes and pathways that would bring a measureable quantity of contaminant to the aquifer in the shortest time, carries particular regulatory significance because of its relevance in formulating the most conservative hazard-prevention scenarios. Unsaturated-zone flow is usually modeled as a diffusive process responding to gravity and pressure gradients as mediated by the unsaturated hydraulic properties of the materials traversed. The mathematical formulation of the diffuse-flow concept is known as Richards' equation, which when coupled to a solute transport equation, such as the advection-dispersion equation, provides a framework to simulate contaminant migration in the unsaturated zone. In recent decades awareness has increased that much fluid flow and contaminant transport within the unsaturated zone takes place as preferential flow, faster than would be predicted by the coupled Richards' and advection-dispersion equations with hydraulic properties estimated by traditional means. At present the hydrologic community has not achieved consensus as to whether a modification of Richards' equation, or a fundamentally different formulation, would best quantify preferential flow. Where the fastest contaminant transport speed is what needs to be estimated, there is the possibility of simplification of the evaluation process. One way of doing so is by a two-step process in which the first step is to evaluate whether significant preferential flow and solute transport is possible for the media and conditions of concern. The second step is to carry out (a) a basic Richards' and advection-dispersion equation analysis if it is concluded that preferential flow is not possible or (b) an analysis that considers only the fastest possible preferential-flow processes, if preferential flow is possible. For the preferential-flow situation, a recently published model describable as a Source-Responsive Preferential-Flow (SRPF) model is an easily applied option. This report documents the application of this two-step process to flow through the thick unsaturated zones of Rainier Mesa and Shoshone Mountain in the Nevada Test Site. Application of the SRPF model involves distinguishing between continuous and intermittent water supply to preferential flow paths. At Rainier Mesa and Shoshone Mountain this issue is complicated by the fact that contaminant travel begins at a location deep in the subsurface, where there may be perched water that may or may not act like a continuous supply, depending on such features as the connectedness of fractures and the nature of impeding layers. We have treated this situation by hypothesizing both continuous and intermittent scenarios for contaminant transport to the carbonate aquifer and reporting estimation of the fastest speed for both of these end members.

Brian A. Ebel; John R. Nimmo

2009-09-11

47

Site Characterization at a Tidal Energy Site in the East River, NY (usa)  

NASA Astrophysics Data System (ADS)

A comprehensive tidal energy site characterization is performed using ADV measurements of instantaneous horizontal current magnitude and direction at the planned hub centerline of a tidal turbine over a two month period, and contributes to the growing data base of tidal energy site hydrodynamic conditions. The temporal variation, mean current statistics, and turbulence of the key tidal hydrodynamic parameters are examined in detail, and compared to estimates from two tidal energy sites in Puget Sound. Tidal hydrodynamic conditions, including mean annual current (at hub height), the speed of extreme gusts (instantaneous horizontal currents acting normal to the rotor plane), and turbulence intensity (as proposed here, relative to a mean current of 2 m s-1) can vary greatly among tidal energy sites. Comparison of hydrodynamic conditions measured in the East River tidal straight in New York City with those reported for two tidal energy sites in Puget Sound indicate differences of mean annual current speeds, difference in the instantaneous current speeds of extreme gusts, and differences in turbulence intensities. Significant differences in these parameters among the tidal energy sites, and with the tidal resource assessment map, highlight the importance of conducting site resource characterization with ADV measurements at the machine scale. As with the wind industry, which adopted an International Electrotechnical Commission (IEC) wind class standard to aid in the selection of wind turbines for a particular site, it is recommended that the tidal energy industry adopt an appropriate standard for tidal current classes. Such a standard requires a comprehensive field campaign at multiple tidal energy sites that can identify the key hydrodynamic parameters for tidal current site classification, select a list of tidal energy sites that exhibit the range of hydrodynamic conditions that will be encountered, and adopt consistent measurement practices (standards) for site classification.

Gunawan, B.; Neary, V. S.; Colby, J.

2012-12-01

48

Addendum for the Groundwater Flow Model of Corrective Action Units 101 and 102: Central and Western Pahute Mesa, Nevada Test Site, Nye County, Nevada, Revision 0 (page changes)  

SciTech Connect

This document, which makes changes to Groundwater Flow Model of Corrective Action Units 101 and 102: Central and Western Pahute Mesa, Nevada Test Site, Nye County, Nevada, S-N/99205--076, Revision 0 (June 2006) was prepared to address review comments of this final document by the Nevada Division of Environmental Protection (NDEP) in a letter dated July 19, 2006. The document includes revised pages that address NDEP review comments and comments from other document users. Change bars are included on these pages to identify where the text was revised. In addition to the revised pages, the following clarifications are made: • On Plate 1 (inserted in the back of the document), the ET Unit legend has been revised. The revised Plate 1 is included and replaces the original Plate 1. • Some of the Appendix D perturbation sensitivity analysis plots included on the CD for Sections D.3.1 and D.3.2 were not properly aligned. A revised CD is provided with all plots properly aligned.

John McCord

2007-05-01

49

76 FR 30152 - East Calloway County Middle School Mercury Spill Site, Murray, Calloway County, KY; Notice of...  

Federal Register 2010, 2011, 2012, 2013

...FRL-9310-4] East Calloway County Middle School Mercury Spill Site, Murray, Calloway County...the East Calloway County Middle School Mercury Spill Site located in Murray, Calloway...County [[Page 30153

2011-05-24

50

Mesa Verde Archaeoastronomy  

NASA Astrophysics Data System (ADS)

Mesa Verde archaeoastronomy has been studied for over 100 years through academic research. Investigators have excavated, stabilized, and documented the major dwellings in Mesa Verde National Park. Evidence for astronomical orientation and alignment was found in Cliff Palace and Sun Temple. The level of documentation increased with each new research project. With good documentation practices, together, the research has shown that the cultures of the Mesa Verde were advanced in their social organization and use of astronomy. Consultation with Native American tribal leaders will add significant background to the depth of knowledge that their ancestors possessed.

Munson, Gregory E.

51

A reconnaissance investigation of hydrogeochemistry and hydrology of Rainier Mesa  

Microsoft Academic Search

Rainier Mesa, in the northern part of the Nevada Test Site, provides a unique opportunity to study unsaturated flow in volcanic tuffs. This was accomplished by sampling soil waters on the mesa top and comparing them with waters in tunnels 200 to 350 meters below the surface. Discharge measurements were also made in the tunnels. The sampling was undertaken as

R. L. Jacobson; M. S. Henne; J. W. Hess

1986-01-01

52

US Geological Survey investigations in the U12n. 03 drift, Rainier Mesa, Area 12, Nevada Test Site, Nevada  

Microsoft Academic Search

The U12n.03 drift was designed for a nuclear test site and mining was started on April 18, 1966, and completed May 22, 1967. The drift was driven along a bearing of N. 26° W. at an elevation of 1849.2 m (6067 ft) to a total length of 660.2 m (2166 ft). The drift lies entirely within tunnel bed 4 of

J. R. Ege; R. D. Carroll; J. E. Magner; D. R. Cunningham

1980-01-01

53

Predevelopment Water-Level Contours for Aquifers in the Rainier Mesa and Shoshone Mountain area of the Nevada Test Site, Nye County, Nevada  

SciTech Connect

Contaminants introduced into the subsurface of the Nevada Test Site at Rainier Mesa and Shoshone Mountain by underground nuclear testing are of concern to the U.S. Department of Energy and regulators responsible for protecting human health and safety. Although contaminants were introduced into low-permeability rocks above the regional flow system, the potential for contaminant movement away from the underground test areas and into the accessible environment is greatest by ground-water transport. The primary hydrologic control on this transport is evaluated and examined through a series of contour maps developed to represent the water-level distribution within each of the major aquifers underlying the area. Aquifers were identified and their extents delineated by merging and analyzing multiple hydrostratigraphic framework models developed by other investigators from existing geologic information. The contoured water-level distribution in each major aquifer was developed from a detailed evaluation and assessment of available water-level measurements. Multiple spreadsheets that accompany this report provide pertinent water-level and geologic data by well or drill hole. Aquifers are mapped, presented, and discussed in general terms as being one of three aquifer types—volcanic aquifer, upper carbonate aquifer, or lower carbonate aquifer. Each of these aquifer types was subdivided and mapped as independent continuous and isolated aquifers, based on the continuity of its component rock. Ground-water flow directions, as related to the transport of test-generated contaminants, were developed from water-level contours and are presented and discussed for each of the continuous aquifers. Contoured water-level altitudes vary across the study area and range from more than 5,000 feet in the volcanic aquifer beneath a recharge area in the northern part of the study area to less than 2,450 feet in the lower carbonate aquifer in the southern part of the study area. Variations in water-level altitudes within any single continuous aquifer range from a few hundred feet in a lower carbonate aquifer to just more than 1,100 feet in a volcanic aquifer. Flow directions throughout the study area are dominantly southward with minor eastward or westward deviations. Primary exceptions are westward flow in the northern part of the volcanic aquifer and eastward flow in the eastern part of the lower carbonate aquifer. Northward flow in the upper and lower carbonate aquifers in the northern part of the study area is possible but cannot be substantiated because data are lacking. Interflow between continuous aquifers is evaluated and mapped to define major flow paths. These flow paths delineate tributary flow systems, which converge to form the regional ground-water flow system. The implications of these tributary flow paths in controlling transport away from the underground test areas at Rainier Mesa and Shoshone Mountain are discussed. The obvious data gaps contributing to uncertainties in the delineation of aquifers and development of water-level contours are identified and evaluated.

Joseph M. Fenelon; Randell J. Laczniak; and Keith J. Halford

2008-06-24

54

Report of drilling and radionuclide migration investigations at UE20n. number sign. 1, Pahute Mesa, Nevada Test Site, 1987  

SciTech Connect

Exploratory hole UE20n{number sign}1 was drilled 305 m down hydraulic gradient of the Cheshire event (U20n) as part of the Radionuclide Migration Program at the Nevada Test Site. The hole was designed to investigate the possibility of groundwater transport of radionuclides from the U20n cavity region. Drilling reached a total depth of 1005.8 m. Composite static water levels in the borehole were measured at approximately 620 m below ground surface. The borehole penetrated about 386 m of saturated zone, which was comprised primarily of rhyolite lava flows of the Upper Rhyolite Lavas, Tuffs, and Rhyolites of Area 20. Evidence from UE20n{number sign}1 suggests the presence of a relatively more permeable zone in the 730 to 750-m depth interval. The neutron log suggests that greater quantities of water were present at depths between 729 and 747 m. Core collected over three depth intervals showed the highest fracture density in a reddish-grey rhyolite lava flow in the 733.8 to 738.1-m core interval. Groundwater flow away from U20n through this permeable zone is suggested by the UE20n{number sign}1 borehole temperature logs. Elevated {sup 3}H activities were observed with the highest activities found near 732 m. The {sup 3}H activities observed in the 732 to 802-m interval in UE20n{number sign}1 were of similar magnitude to those found in the cavity region in the U20n post-shot hole. The activities of {sup 125}Sb and {sup 85}Kr, which are known to be mobile in groundwater, were of similar magnitude to those found near the cavity region, while {sup 137}Cs, which is thought to be adsorbed during transport, was found in activities two to three orders of magnitude lower than near the cavity. These temperature and radioisotope data suggest that radionuclide migration via groundwater flow may be occurring laterally from the U20n rubble chimney through the permeable zone located at the 730 to 750-m depth. 25 refs., 18 figs., 15 tabs.

Erikson, S.J.

1991-04-01

55

The MESA accelerator  

SciTech Connect

The MESA accelerator will operate for particle and nuclear physics experiments in two different modes. A first option is conventional c.w. acceleration yielding 150-200MeV spin-polarized external beam. Second, MESA will be operated as a superconducting multi-turn energy recovery linac (ERL), opening the opportunity to perform experiments with a windowless target with beam current of up to 10 mA. The perspectives for innovative experiments with such a machine are discussed together with a sketch of the accelerator physics issues that have to be solved.

Aulenbacher, Kurt [Institut für Kernphysik, Johannnes-Gutenberg-Universität Mainz (Germany)

2013-11-07

56

Location of a new ice core site at Talos Dome (East Antarctica)  

Microsoft Academic Search

In the frame of glaciology and palaeoclimate research, Talos Dome (72°48lS; 159°06lE), an ice dome on the East Antarctic plateau, represents the new selected site for a new deep ice core drilling. The increasing interest in this re- gion is due to the fact that the ice accumulation is higher here than in other domes in East Antarctica. A new

Stefano Urbini; Lili Cafarella; Achille Zirizzotti; Cesidio Bianchi; Ignazio Tabacco; Massimo Frezzotti; Ardito Desio; S. Maria

2006-01-01

57

Corrective Action Investigation Plan for Corrective Action Unit 99: Rainier Mesa\\/Shoshone Mountain, Nevada Test Site, Nevada, Rev. No. 0  

Microsoft Academic Search

This Corrective Action Investigation Plan (CAIP) was developed for Corrective Action Unit (CAU) 99, Rainier Mesa\\/Shoshone Mountain. The CAIP is a requirement of the ''Federal Facility Agreement and Consent Order'' (FFACO) agreed to by the State of Nevada, the U.S. Department of Energy (DOE), and the U.S. Department of Defense (DoD) (FFACO, 1996). The FFACO addresses environmental restoration activities at

John McCord

2004-01-01

58

An inventory survey at the site of the proposed Kilauea Middle East Rift Zone (KMERZ), Well Site No. 2  

SciTech Connect

At the request of True Mid Pacific Geothermal, Archaeological Consultants of Hawaii, Inc. has conducted an inventory survey at the site of the proposed Kilauea Middle East Rift Zone (KMERZ), Well Site No.2, TMK: 1-2-10:3. The Principal Investigator was Joseph Kennedy M.A., assisted by Jacob Kaio, Field Supervisor and field crew Mark Borrello B.A., Michael O'Shaughnessy B.A., and Randy Adric. This report supercedes all previous reports submitted to the Historic Presentation Section of the Department of Land and Natural Resources. In addition to 100% surface coverage of the 400 x 400 foot well pad itself, 100% surface coverage of a substantial buffer zone was also completed. This buffer zone was established by the Department of Land and Natural Resources, Historic Preservation personnel and extends 1000 feet east and west of the well site and 500 feet north and south of the well site.

Kennedy, Joseph

1991-03-01

59

A conceptual model and preliminary estimate of potential tritium migration from the Benham (U-20c) site, Pahute Mesa, Nevada Test Site  

SciTech Connect

U-20c is the site of a large below-water-table nuclear test near the Nevada Test Site boundary. A conceptual model of potential groundwater migration of tritium from U-20c is constructed and quantitatively evaluated in this report. The lower portion of the collapse chimney at Benham is expected to intersect 200 m of permeable rhyolite lava, overlain by similar thicknesses of low-permeability zeolitized bedded tuff, then permeable welded tuff. Vertical groundwater flow through the chimney is predicted to be minimal, horizontal transport should be controlled by the regional groundwater flow. Analytic solutions treating only advective transport indicate 1 to 2 km of tritium movement (95% confidence interval 0.7--2.5 km) within 5 years after test-related pressure-temperature transients have dissipated. This point lies at the axis of a potentiometric surface trough along the west edge of Area 20, Nevada Test Site. Within 25 years, movement is predicted to extend to 3 km (95% confidence interval 2--5 km) approximately to the intersection of the trough and the Nevada Test Site boundary. Considering the effects of radioactive decay, but not dispersion, plume concentration would fall below Safe Drinking Water Act standards by 204 years, at a predicted distance of 11 km (95% confidence interval 7--31 km). This point is located in the eastern portion of the Timber Mountain Caldera moat within the Nellis Air Force Range (military bombing range).

Brikowski, T.; Mahin, G. [Nevada Univ., Reno, NV (United States). Water Resources Center

1993-08-01

60

18. Tail race of the Hayden Ditch, looking east toward ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

18. Tail race of the Hayden Ditch, looking east toward the Tempe Bridge and Hayden's Butte, the site of Charles Hayden's vision of the Tempe Canal. This ditch, which formerly supplied the San Francisco Canal, has been out of service since the 1950s. Photographer: Mark Durben, June 1989. Source: SRPA - Tempe Canal, South Side Salt River in Tempe, Mesa & Phoenix, Tempe, Maricopa County, AZ

61

Early Agriculture in Primorye, Russian Far East: New Radiocarbon and Pollen Data from Late Neolithic Sites  

Microsoft Academic Search

Russian Far East as a part of Northeast Asia is one of the centres of early plant domestication, particularly with respect to millet. New radiocarbon AMS dates associated with the pollen of cultivated cereals (Cerealia) from Late Neolithic layers on the Boisman 2 and Novoselische 4 sites allow estimates of the beginning of foxtail millet (Setaria italica(L.) Beauv.) cultivation about

Y. V. Kuzmin; A. J. T. Jull; G. A. Jones

1998-01-01

62

Meat-feasting Sites and Cattle Brands: Patterns of Rock-shelter Utilization in East Africa  

Microsoft Academic Search

Dr. Gramly has been working on the origins and development of East Africa's first food-producers. He is presently on the staff of the State University of New York at Stony Brook. In this article he describes excavations at two nineteenth century pastoral Masai sites and suggests an approach for tracing Maa-speaking pastoralists in the archaeological record.

Richard Michael Gramly

1975-01-01

63

Survival of selected pine seed sources with different seedling treatments on droughty sites in East Texas  

E-print Network

1980). Not all mycorrhizae forming fungi are equally beneficial or adapted to the wide range of climatic or soil conditions supporting pine growth (Ruehle and Brendemuehl 1981) . Pisolithus tinctorius is particujarly able to prcmote growth... Mich are adapted to dry sites or seed sources that have been selected for drought resistance can be considered. Zn East Texas shortleaf pine and drought resistant loblolly pine may be considered for dry sites. Shortleaf pine usually does better...

Echols, Ralph James

2012-06-07

64

Mathematics, Engineering, Science Achievement (MESA)  

NSDL National Science Digital Library

California's Mathematics, Engineering, Science Achievement (MESA), founded in 1970, assists students to become highly trained technological professionals by serving educationally disadvantaged students and, to the extent possible by law, emphasizes participation by students from groups with low eligibility rates for four-year colleges. Learn about MESA initiatives such as its Schools Program (MSP), Success Through Collaboration (MESA STC), California Community College Program (CCCP), and Engineering Program (MEP).

2007-09-05

65

Hydrogeologic setting east of a low-level radioactive-waste disposal site near Sheffield, Illinois  

USGS Publications Warehouse

Core samples from 45 test wells and 4 borings were used to describe the glacial geology of the area east of the low-level radioactive-waste disposal site near Sheffield, Bureau County, Illinois. Previous work has shown that shallow ground water beneath the disposal site flows east through a pebbly-sand unit of the Toulon Member of the Glasford Formation. The pebbly sand was found in core samples from wells in an area extending northeast from the waste-disposal site to a strip-mine lake and east along the south side of the lake. Other stratigraphic units identified in the study area are correlated with units found on the disposal site. The pebbly-sand unit of the Toulon Member grades from a pebbly sand on site into a coarse gravel with sand and pebbles towards the lake. The Hulick Till Member, a key bed, underlies the Toulon Member throughout most of the study area. A narrow channel-like depression in the Hulick Till is filled with coarse gravelly sand of the Toulon Member. The filled depression extends eastward from near the northeast corner of the waste-disposal site to the strip-mine lake. (USGS)

Foster, J.B.; Garklavs, George; Mackey, G.W.

1984-01-01

66

Geology Fieldnotes: Mesa Verde National Park, Colorado  

NSDL National Science Digital Library

This National Park Service (NPS) site provides information about Mesa Verde National Park in southwestern Colorado, including geology, visitor information, illustrations, and additional links for more details. This park was home to the Anasazi people who were cliff dwellers in this area. Today you can see artifacts, native dwellings made of sandstone bricks, and learn about the Anasazi way of life, dating back to around 550 AD.

67

Inversion of Gravity Data to Define the Pre-Cenozoic Surface and Regional Structures Possibly Influencing Groundwater Flow in the Rainier Mesa Region, Nye County, Nevada  

USGS Publications Warehouse

A three-dimensional inversion of gravity data from the Rainier Mesa area and surrounding regions reveals a topographically complex pre-Cenozoic basement surface. This model of the depth to pre-Cenozoic basement rocks is intended for use in a 3D hydrogeologic model being constructed for the Rainier Mesa area. Prior to this study, our knowledge of the depth to pre-Cenozoic basement rocks was based on a regional model, applicable to general studies of the greater Nevada Test Site area but inappropriate for higher resolution modeling of ground-water flow across the Rainier Mesa area. The new model incorporates several changes that lead to significant improvements over the previous regional view. First, the addition of constraining wells, encountering old volcanic rocks lying above but near pre-Cenozoic basement, prevents modeled basement from being too shallow. Second, an extensive literature and well data search has led to an increased understanding of the change of rock density with depth in the vicinity of Rainier Mesa. The third, and most important change, relates to the application of several depth-density relationships in the study area instead of a single generalized relationship, thereby improving the overall model fit. In general, the pre-Cenozoic basement surface deepens in the western part of the study area, delineating collapses within the Silent Canyon and Timber Mountain caldera complexes, and shallows in the east in the Eleana Range and Yucca Flat regions, where basement crops out. In the Rainier Mesa study area, basement is generally shallow (< 1 km). The new model identifies previously unrecognized structures within the pre-Cenozoic basement that may influence ground-water flow, such as a shallow basement ridge related to an inferred fault extending northward from Rainier Mesa into Kawich Valley.

Hildenbrand, Thomas G.; Phelps, Geoffrey A.; Mankinen, Edward A.

2006-01-01

68

Inversion of Gravity Data to Define the Pre-Cenozoic Surface and Regional Structures Possibly Influencing Groundwater Flow in the Rainier Mesa Region, Nye County, Nevada.  

SciTech Connect

A three-dimensional inversion of gravity data from the Rainier Mesa area and surrounding regions reveals a topographically complex pre-Cenozoic basement surface. This model of the depth to pre-Cenozoic basement rocks is intended for use in a 3D hydrogeologic model being constructed for the Rainier Mesa area. Prior to this study, our knowledge of the depth to pre-Cenozoic basement rocks was based on a regional model, applicable to general studies of the greater Nevada Test Site area but inappropriate for higher resolution modeling of ground-water flow across the Rainier Mesa area. The new model incorporates several changes that lead to significant improvements over the previous regional view. First, the addition of constraining wells, encountering old volcanic rocks lying above but near pre-Cenozoic basement, prevents modeled basement from being too shallow. Second, an extensive literature and well data search has led to an increased understanding of the change of rock density with depth in the vicinity of Rainier Mesa. The third, and most important change, relates to the application of several depth-density relationships in the study area instead of a single generalized relationship, thereby improving the overall model fit. In general, the pre-Cenozoic basement surface deepens in the western part of the study area, delineating collapses within the Silent Canyon and Timber Mountain caldera complexes, and shallows in the east in the Eleana Range and Yucca Flat regions, where basement crops out. In the Rainier Mesa study area, basement is generally shallow (< 1 km). The new model identifies previously unrecognized structures within the pre-Cenozoic basement that may influence ground-water flow, such as a shallow basement ridge related to an inferred fault extending northward from Rainier Mesa into Kawich Valley.

Thomas G. Hildenbrand; Geoffrey A. Phelps; Edward A. Mankinen

2006-09-21

69

Modeling Approach/Strategy for Corrective Action Unit 99: Rainier Mesa and Shoshone Mountain, Nevada Test Site, Nye County, Nevada, Revision 1, with ROTC-1  

SciTech Connect

This document describes an approach for preliminary (Phase I) flow and transport modeling for the Rainier Mesa/Shoshone Mountain (RMSM) Corrective Action Unit (CAU). This modeling will take place before the planned Phase II round of data collection to better identify the remaining data gaps before the fieldwork begins. Because of the geologic complexity, limited number of borings, and large vertical gradients, there is considerable uncertainty in the conceptual model for flow; thus different conceptual models will be evaluated, in addition to different framework and recharge models. The transport simulations will not be used to formally calculate the Contaminant Boundary at this time. The modeling (Phase II) will occur only after the available data are considered sufficient in scope and quality.

Greg Ruskauff

2008-06-01

70

MODULES FOR EXPERIMENTS IN STELLAR ASTROPHYSICS (MESA)  

SciTech Connect

Stellar physics and evolution calculations enable a broad range of research in astrophysics. Modules for Experiments in Stellar Astrophysics (MESA) is a suite of open source, robust, efficient, thread-safe libraries for a wide range of applications in computational stellar astrophysics. A one-dimensional stellar evolution module, MESAstar, combines many of the numerical and physics modules for simulations of a wide range of stellar evolution scenarios ranging from very low mass to massive stars, including advanced evolutionary phases. MESAstar solves the fully coupled structure and composition equations simultaneously. It uses adaptive mesh refinement and sophisticated timestep controls, and supports shared memory parallelism based on OpenMP. State-of-the-art modules provide equation of state, opacity, nuclear reaction rates, element diffusion data, and atmosphere boundary conditions. Each module is constructed as a separate Fortran 95 library with its own explicitly defined public interface to facilitate independent development. Several detailed examples indicate the extensive verification and testing that is continuously performed and demonstrate the wide range of capabilities that MESA possesses. These examples include evolutionary tracks of very low mass stars, brown dwarfs, and gas giant planets to very old ages; the complete evolutionary track of a 1 M {sub sun} star from the pre-main sequence (PMS) to a cooling white dwarf; the solar sound speed profile; the evolution of intermediate-mass stars through the He-core burning phase and thermal pulses on the He-shell burning asymptotic giant branch phase; the interior structure of slowly pulsating B Stars and Beta Cepheids; the complete evolutionary tracks of massive stars from the PMS to the onset of core collapse; mass transfer from stars undergoing Roche lobe overflow; and the evolution of helium accretion onto a neutron star. MESA can be downloaded from the project Web site (http://mesa.sourceforge.net/).

Paxton, Bill; Bildsten, Lars [Kavli Institute for Theoretical Physics and Department of Physics, Kohn Hall, University of California, Santa Barbara, CA 93106 (United States); Dotter, Aaron; Herwig, Falk [Department of Physics and Astronomy, University of Victoria, P.O. Box 3055, STN CSC, Victoria, BC V8W 3P6 (Canada); Lesaffre, Pierre [LERMA-LRA, CNRS UMR8112, Observatoire de Paris and Ecole Normale Superieure, 24 Rue Lhomond, 75231 Paris Cedex 05 (France); Timmes, Frank [School of Earth and Space Exploration, Arizona State University, P.O. Box 871404, Tempe, AZ 85287-1404 (United States)

2011-01-15

71

76 FR 13182 - Settlement Agreement for Recovery of Past Response Costs; 345 North 700 East, Richfield PCE Site...  

Federal Register 2010, 2011, 2012, 2013

...Agreement for Recovery of Past Response Costs; 345 North 700 East, Richfield...at this Site for Past Response Costs, as those terms are defined in...reimbursement of Past Response Costs. Opportunity for Comment: For thirty...

2011-03-10

72

Characterization of Preferential Flowpaths at the T-Tunnel Complex, Rainier Mesa, Nevada  

Microsoft Academic Search

Rainier Mesa (RM), a tuffaceous plateau on the Nevada Test Site, has been the location of numerous subsurface nuclear tests. The tests were conducted in a series of tunnel complexes located approximately 450 m below the top of the mesa and 1000 m above the regional ground water flow system. The tunnels were constructed near the middle of a 690

D. M. Reeves; R. Schultz; C. Bingham; K. Pohlmann; C. Russell; J. Chapman

2007-01-01

73

Assessing hydraulic connections across a complex sequence of volcanic rocks-Analysis of U-20 WW multiple-well aquifer test, Pahute Mesa, Nevada National Security Site, Nevada  

USGS Publications Warehouse

Groundwater beneath Pahute Mesa flows through a complexly layered sequence of volcanic rock aquifers and confining units that have been faulted into distinct structural blocks. Hydraulic property estimates of rocks and structures in this flow system are necessary to assess radionuclide migration near underground nuclear testing areas. The U.S. Geological Survey (USGS) used a 12 month (October 1, 2008-October 1, 2009) intermittent pumping schedule of well U-20 WW and continuously monitored water levels in observation wells ER-20-6 #3, UE-20bh 1, and U-20bg as a multi-well aquifer test to evaluate hydraulic connections across structural blocks, bulk hydraulic properties of volcanic rocks, and the hydraulic significance of a major fault. Measured water levels were approximated using synthetic water levels generated from an analytical model. Synthetic water levels are a summation of environmental water-level fluctuations and a Theis (1935) transform of the pumping signal from flow rate to water-level change. Drawdown was estimated by summing residual differences between measured and synthetic water levels and the Theis-transformed pumping signal from April to September 2009. Drawdown estimates were used in a three-dimensional numerical model to estimate hydraulic properties of distinct aquifers, confining units, and a major fault. A maximum water-level drawdown of nearly 0.4 foot in well UE-20bh 1, which is more than 1 mile from the pumping well, was detected across a major fault. Drawdown estimates in the observation well nearest to (ER-20-6 #3, less than 1 mile) and within the same structural block as the pumping well were less than detection (-6 per foot, respectively, and transmissivity estimates range from 1,200 to 3,600 feet squared per day. Sensitivity analyses indicate that the major fault is hydraulically similar to the permeable host rock and connects flow between structural blocks.

Garcia, C. Amanda; Fenelon, Joseph M.; Halford, Keith J.; Reiner, Steven R.; Laczniak, Randell J.

2011-01-01

74

Remedial actions at the former Climax Uranium Company, Uranium Mill site, Grand Junction, Mesa County, Colorado. Volume 2, Appendices: Final environmental impact statement  

SciTech Connect

This volume contains Appendix F--hydrology report, and Appendix G--flood plain and wetland assessment. Contents of the hydrology report include: surface water; ground water; potentially affected hydrogeologic environment-processing site; potentially affected hydrogeologic environment-Cheney reservoir site; potentially affected hydrogeologic environment-Two Road site; and conclusions-ground water.

none,

1986-12-01

75

Potential long-term chemical effects of diesel fuel emissions on a mining environment: A preliminary assessment based on data from a deep subsurface tunnel at Rainer Mesa, Nevada test site  

SciTech Connect

The general purpose of the Yucca Mountain Site Characterization Project (YMSCP) Introduced Materials Task is to understand and predict potential long-term modifications of natural water chemistry related to the construction and operation of a radioactive waste repository that may significantly affect performance of the waste packages. The present study focuses on diesel exhaust. Although chemical information on diesel exhaust exists in the literature, it is either not explicit or incomplete, and none of it establishes mechanisms that might be used to predict long-term behavior. In addition, the data regarding microbially mediated chemical reactions are not well correlated with the abiotic chemical data. To obtain some of the required long-term information, we chose a historical analog: the U12n tunnel at Rainier Mesa, Nevada Test Site. This choice was based on the tunnel`s extended (30-year) history of diesel usage, its geological similarity to Yucca Mountain, and its availability. The sample site within the tunnel was chosen based on visual inspection and on information gathered from miners who were present during tunnel operations. The thick layer of dark deposit at that site was assumed to consist primarily of rock powder and diesel exhaust. Surface samples and core samples were collected with an intent to analyze the deposit and to measure potential migration of chemical components into the rock. X-ray diffraction (XRD), x-ray fluorescence (XRF), scanning electron microscopy (SEM) with energy dispersive spectra (EDS) analysis, secondary-ion mass spectrometry (SIMS), and Fourier transform infrared (FTIR) analysis were used to measure both spatial distribution and concentration for the wide variety of chemical components that were expected based on our literature survey.

Meike, A.; Bourcier, W.L.; Alai, M. [and others

1995-09-01

76

Argonne National Laboratory-East site environmental report for calendar year 1998.  

SciTech Connect

This report discusses the results of the environmental protection program at Argonne National Laboratory-East (ANL-E) for 1998. To evaluate the effects of ANL-E operations on the environment, samples of environmental media collected on the site, at the site boundary, and off the ANL-E site were analyzed and compared with applicable guidelines and standards. A variety of radionuclides were measured in air, surface water, on-site groundwater, and bottom sediment samples. In addition, chemical constituents in surface water, groundwater, and ANL-E effluent water were analyzed. External penetrating radiation doses were measured, and the potential for radiation exposure to off-site population groups was estimated. Results are interpreted in terms of the origin of the radioactive and chemical substances (i.e., natural, fallout, ANL-E, and other) and are compared with applicable environmental quality standards. A US Department of Energy dose calculation methodology, based on International Commission on Radiological Protection recommendations and the US Environmental Protection Agency's CAP-88 (Clean Air Act Assessment Package-1988) computer code, was used in preparing this report. The status of ANL-E environmental protection activities with respect to the various laws and regulations that govern waste handling and disposal is discussed, along with the progress of environmental corrective actions and restoration projects.

Golchert, N.W.; Kolzow, R.G.

1999-08-26

77

Argonne National Laboratory-East site environmental report for calendar year 1996  

SciTech Connect

This report discusses the results of the environmental protection program at Argonne National Laboratory-East (ANL-E) for 1996. To evaluate the effects of ANL-E operations on the environment, samples of environmental media collected on the site, at the site boundary, and off the ANL-E site were analyzed and compared to applicable guidelines and standards. A variety of radionuclides were measured in air, surface water, on-site groundwater, soil, grass, and bottom sediment samples. In addition, chemical constituents in surface water, groundwater, and ANL-E effluent water were analyzed. External penetrating radiation doses were measured, and the potential for radiation exposure to off-site population groups was estimated. The results of the surveillance program are interpreted in terms of the origin of the radioactive and chemical substances (natural, fallout, ANL-E, and other) and are compared with applicable environmental quality standards. A US Department of Energy dose calculation methodology, based on International Commission on Radiological Protection recommendations and the CAP-88 version of the EPA-AIRDOSE/RADRISK computer code, is used in this report. The status of ANL-E environmental protection activities with respect to the various laws and regulations that govern waste handling and disposal is discussed. This report also discusses progress being made on environmental corrective actions and restoration projects.

Golchert, N.W.; Kolzow, R.G.

1997-09-01

78

Argonne National Laboratory-East site environmental report for calendar year 1992  

SciTech Connect

This report discusses the results of the Environmental Protection Program at Argonne National Laboratory-East (ANL) for 1992. To evaluate the effects of ANL operations on the environment, samples of environmental media collected on the site, at the site boundary, and off the ANL site were analyzed and compared to applicable guidelines and standards. A variety of radionuclides was measured in air, surface water, groundwater, soil, grass, and bottom sediment samples. In addition, chemical constituents in surface water, groundwater, and ANL effluent water were analyzed. External penetrating radiation doses were measured and the potential for radiation exposure to off-site population groups was estimated. The results of the surveillance program are interpreted in terms of the origin of the radioactive and chemical substances (natural, fallout, ANL, and other) and are compared with applicable environmental quality standards. A US Department of Energy (DOE) dose calculation methodology, based on International Commission on Radiological Protection (ICRP) recommendations and the CAP-88 version of the EPA-AIRDOSE/RADRISK computer code, is used in this report. The status of ANL environmental protection activities with respect to the various laws and regulations which govern waste handling and disposal is discussed.

Golchert, N.W.; Kolzow, R.G.

1993-05-01

79

Argonne National Laboratory-East site environmental report for calendar year 1991  

SciTech Connect

This report discusses the results of the environmental protection program at Argonne National Laboratory-East (ANL) for 1991. To evaluate the effects of ANL operations on the environment, samples of environmental media collected on the site, at the site boundary, and off the ANL site were analyzed and compared to applicable guidelines and standards. A variety of radionuclides was measured in air, surface water, groundwater, soil, grass, and bottom sediment samples. Chemical constituents in surface water, groundwater, and ANL effluent water were analyzed. External penetrating radiation doses were measured and the potential for radiation exposure to off-site population groups was estimated. Results are interpreted in terms of the origin of the radioactive and chemical substances (natural, fallout, ANL, and other) and are compared with applicable environmental quality standards. A US Department of Energy (DOE) dose calculation methodology, based on International Commission on Radiological Protection (ICRP) recommendations and the CAP-88 version of the EPA-AIRDOSE/RADRISK computer code, is used in this report. The status of ANL environmental protection activities with respect to the various laws and regulations which govern waste handling and disposal is discussed. This report also discusses progress being made on environmental corrective actions and restoration projects from past activities.

Golchert, N.W.; Duffy, T.L.; Moos, L.P.

1992-05-01

80

Argonne National Laboratory-East site environmental report for calendar year 1994  

SciTech Connect

This report discusses the results of the environmental protection program at Argonne National Laboratory-East (ANL) for 1994. To evaluate the effects of ANL operations on the environment, samples of environmental media collected on the site, at the site boundary, and off the ANL site were analyzed and compared to applicable guidelines and standards. A variety of radionuclides was measured in air, surface water, groundwater, soil, grass, and bottom sediment samples. In addition, chemical constituents in surface water, groundwater, and ANL effluent water were analyzed. External penetrating radiation doses were measured and the potential for radiation exposure to off-site population groups was estimated. The results of the surveillance program are interpreted in terms of the origin of the radioactive and chemical substances (natural, fallout, ANL, and other) and are compared with applicable environmental quality standards. A US Department of Energy (DOE) dose calculation methodology, based on International Commission on Radiological Protection (ICRP) recommendations and the CAP-88 version of the EPA-AIRDOSE/RADRISK COMPUTER CODE, is used in this report. The status of ANL environmental protection activities with respect to the various laws and regulations which govern waste handling and disposal is discussed. This report also discusses progress being made on environmental corrective actions and restoration projects.

Golchert, N.W.; Kolzow, R.G.

1995-05-01

81

Red Sky with Red Mesa  

SciTech Connect

The Red Sky/Red Mesa supercomputing platform dramatically reduces the time required to simulate complex fuel models, from 4-6 months to just 4 weeks, allowing researchers to accelerate the pace at which they can address these complex problems. Its speed also reduces the need for laboratory and field testing, allowing for energy reduction far beyond data center walls.

None

2011-04-14

82

Edge of the Mesa Alta  

USGS Multimedia Gallery

USGS researcher Craig Allen stands on the edge of Mesa Alta, amid diverse forest and woodland in the uplands of northern New Mexico; note some recently dead ponderosa pine and Douglas-fir in the field of view. Forest drought stress is strongly correlated with tree mortality from poor growth, bark be...

83

Red Sky with Red Mesa  

ScienceCinema

The Red Sky/Red Mesa supercomputing platform dramatically reduces the time required to simulate complex fuel models, from 4-6 months to just 4 weeks, allowing researchers to accelerate the pace at which they can address these complex problems. Its speed also reduces the need for laboratory and field testing, allowing for energy reduction far beyond data center walls.

None

2014-06-23

84

Tank Leak Experiment at the Monk Tank Site, 200 East Area: Electrical Resistance Tomography-Preliminary Results  

SciTech Connect

This report covers the electrical resistance tomography (ERT) work performed at the Mock Tank site, 200 East Area, Hanford Reservation, during the months of July and August, 2001. The work reported herein is to be considered preliminary because it is work in progress. Some of the analyses and interpretation of results are incomplete at this time.

Ramirez, A.; Daily, W.D.; Binley, A.

2001-09-20

85

BA in MIDDLE EAST STUDIES / ARABIC (570141) MAP Sheet International and Area Studies Programs  

E-print Network

language experience.) MESA 201 Introduction to Middle East Studies MESA 250 Introduction to Religion of Islam Pl Sc 200* Political Inquiry Complete the following prereqs for Study Abroad: Arab 201 Second-Year Arabic Arab 202* Intermediate Arabic Geog 271* Middle East IHum 242* Intro to Humanities of Islamic World

Olsen Jr., Dan R.

86

Evaluation of Cesium, Strontium, and Lead Sorption, Desorption, and Diffusion in Cores from Western Pahute Mesa, Nevada Test Site, based on Macroscopic and Spectroscopic Investigations  

SciTech Connect

The interaction of radionuclides and other contaminants with minerals and other aquifer materials controls the rate of migration of these contaminants in groundwater. The stronger these interactions, the more a radionuclide will be retarded. Processes such as sorption and diffusion often control the migration of inorganic compounds in aquifers. These processes are often controlled by the nature of the ions of interest, the nature of the aquifer materials, and the specific geochemical conditions. Parameters describing sorption and diffusion of radionuclides and other inorganic ions on aquifer materials are used in transport codes to predict the potential for migration of these contaminants into the accessible environment. Sorption and diffusion studies can reduce the uncertainty of radionuclide transport modeling on the Nevada Test Site (NTS) and other nuclear testing areas.

Charalambos Papelis; Wooyong Um

2003-03-01

87

Buried-mesa avalanche photodiodes  

Microsoft Academic Search

We have developed a low-cost buried-mesa avalanche photodiode (APD) primarily targeted for 2.5-Gb\\/s lightwave applications. These APDs are made by a simple batch process that produces a robust and reliable device with potentially high yield and thus low cost. The entire base structure of our InGaAs-InP APD is grown in one epitaxial step and the remaining process consists of four

Ghulam Hasnain; Wayne G. Bi; S. Song; John T. Anderson; Nick Moll; Chung-Yi Su; James N. Hollenhorst; Nicholas D. Baynes; I. Athroll; Sean Amos; R. M. Ash

1998-01-01

88

A Hydrostrat Model and Alternatives for Groundwater Flow and Contaminant Transport Model of Corrective Action Unit 99: Rainer Mesa-Shoshone Mountain, Nye County, Nevada  

SciTech Connect

The three-dimensional hydrostratigraphic framework model for the Rainier Mesa-Shoshone Mountain Corrective Action Unit was completed in Fiscal Year 2006. The model extends from eastern Pahute Mesa in the north to Mid Valley in the south and centers on the former nuclear testing areas at Rainier Mesa, Aqueduct Mesa, and Shoshone Mountain. The model area also includes an overlap with the existing Underground Test Area Corrective Action Unit models for Yucca Flat and Pahute Mesa. The model area is geologically diverse and includes un-extended yet highly deformed Paleozoic terrain and high volcanic mesas between the Yucca Flat extensional basin on the east and caldera complexes of the Southwestern Nevada Volcanic Field on the west. The area also includes a hydrologic divide between two groundwater sub-basins of the Death Valley regional flow system. A diverse set of geological and geophysical data collected over the past 50 years was used to develop a structural model and hydrostratigraphic system for the model area. Three deep characterization wells, a magnetotelluric survey, and reprocessed gravity data were acquired specifically for this modeling initiative. These data and associated interpretive products were integrated using EarthVision{reg_sign} software to develop the three-dimensional hydrostratigraphic framework model. Crucial steps in the model building process included establishing a fault model, developing a hydrostratigraphic scheme, compiling a drill-hole database, and constructing detailed geologic and hydrostratigraphic cross sections and subsurface maps. The more than 100 stratigraphic units in the model area were grouped into 43 hydrostratigraphic units based on each unit's propensity toward aquifer or aquitard characteristics. The authors organized the volcanic units in the model area into 35 hydrostratigraphic units that include 16 aquifers, 12 confining units, 2 composite units (a mixture of aquifer and confining units), and 5 intrusive confining units. The underlying pre-Tertiary rocks are divided into six hydrostratigraphic units, including three aquifers and three confining units. Other units include an alluvial aquifer and a Mesozoic-age granitic confining unit. The model depicts the thickness, extent, and geometric relationships of these hydrostratigraphic units ('layers' in the model). The model also incorporates 56 Tertiary normal faults and 4 Mesozoic thrust faults. The complexity of the model area and the non-uniqueness of some of the interpretations incorporated into the base model made it necessary to formulate alternative interpretations for some of the major features in the model. Four of these alternatives were developed so they can be modeled in the same fashion as the base model. This work was done for the U.S. Department of Energy, National Nuclear Security Administration Nevada Site Office in support of the Underground Test Area Subproject of the Environmental Restoration Project.

NSTec Geotechnical Sciences Group

2007-03-01

89

Ages of tuff beds at East African early hominid sites and sediments in the Gulf of Aden  

USGS Publications Warehouse

The early hominids of East Africa were dated by determining the ages of tuff beds at the sites. Despite much research using palaeomagnetic and K/Ar-dating techniques, some of those ages are still controversial 1,2. To obtain independent age estimates for these tephra layers, we have examined cores from DSDP Sites 231 and 232 in the Gulf of Aden (Fig. 1a) which consist mainly of calcareous nannofossil ooze, but also contain rare tephra horizons3 dated by interpolation from the established nannofossil stratigraphy (Fig. 1b). Chemical analysis confirms that the identity and sequence of these horizons is the same as that at the East African sites. We conclude that the age of the Tulu Bor Tuff is <3.4 Myr and hence that the Hadar hominid specimens are also

Sarna-Wojcicki, A. M.; Meyer, C.E.; Roth, P.H.; Brown, F.H.

1985-01-01

90

Earthquake Monitoring at 9° 50'N on the East Pacific Rise RIDGE 2000 Integrated Studies Site  

NASA Astrophysics Data System (ADS)

In the fall of 2003 nine ocean bottom seismometers (OBSs) were deployed from the R/V Keldysh within the `bull's-eye' region of the R2K ISS at 9° 49'N - 9° 51'N on the East Pacific Rise as part of the Ridge 2000 Integrated Studies Site. These instruments were recovered using the R/V Atlantis in April 2004, and twelve more were deployed to take their place for a second year of monitoring (with three years total planned). During the turn-around cruise, two short temporary deployments (~4-8 days), of an additional 3 OBSs each, were accomplished to provide very dense instrument spacing (a few 100 m) around specific vents where in situ chemical monitoring was taking place (Luther et al.). Good data were collected on seven of the nine long deployment and six short deployment OBSs. We will present early results from analysis of these data including an estimate of the level of activity observed through-out the seven month period of the first deployment, and preliminary epicenters. Data will also be shown from the short temporary deployments. Early analysis of these data indicates an event rate of ~8 events per day for events where arrivals are apparent on at least three instruments, and may therefore expect to be located. Also notable in these data are pulses and prolonged periods of what appear to be tremor. This tremor is not generally coherent or synchronous from station to station and is therefore likely a very localized phenomena associated with hydrothermal fluid flow. The exceptionally well characterized and monitored seafloor at this site will allow for unprecedented correlation of observed seismic activity with local biology, geology, geochemical and hydrothermal monitoring. In addition, past and future detailed geophysical imaging of this area will provide an excellent context for observed faulting and fracturing.

Tolstoy, M.; Waldhauser, F.; Kim, W.

2004-12-01

91

Overview from bluff east of facility. Note buildings #35 (left). ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Overview from bluff east of facility. Note buildings #35 (left). #33 (center), and #31 A (right) VIEW WEST - Department of Energy, Grand Junction Office, 2597 B3/4 Road, Grand Junction, Mesa County, CO

92

A geophysical-geological transect of the Silent Canyon caldera complex, Pahute Mesa, Nevada  

SciTech Connect

Revision of lithological logs for boreholes penetrating the volcanic center at Pahute Mesa, Neveda, has led to a thorough review of the volcanic stratigraphy and geologic structure. The authors have combined this review with a compilation of old and newly acquired gravity and seismic travel time data, producing a unified interpretation along a northwest to southeast profile. The analysis supports a new interpretation of the Silent Canyon caldera complex. The caldera is found to be more asymmetric than previously suggested, with the southeastern boundary formed by linear, high-angle normal faults and a more gently sloping northwestern boundary. The total thickness of volcanic units within the caldera complex does not appear to exceed 5 km. The shallow structure at Pahute Mesa could have a profound effect on the seismic response for regional and teleseismic signals from this nuclear test site. The Silent Canyon caldera complex is actually a set of nested calderas first filled by thick (>1 km) postcaldera lavas and subsequently buried by outflow sheets of the Timber Mountain caldera to the south. Thick, postcaldera lavas filled a half-graben structure formed west of the West Greeley fault, dropping the tops of the youngest caldera-forming units to depths in excess of 2 km. Therefore the western boundary of the caldera complex is poorly defined. East of the West Greeley fault, two overlapping calderas are defined, and stratigraphic data suggest the presence of even older calderas. The youngest caldera, the calc-alkaline Area 20 caldera, is well defined from drill hole data. The Area 20 caldera overlaps the 13.6 Ma peralkaline Grouse Canyon caldera, which is less well defined, but apparently collapsed in trap-door style along the Almendro fault. For both these calderas, collapse continued after the main caldera-forming eruption, concurrent with the accumulation of thick (>1 km) lavas within the peripheral collapse zones. 67 refs., 13 figs.

Ferguson, J.F. [Univ. of Texas at Dallas, Richardson, TX (United States)] [Univ. of Texas at Dallas, Richardson, TX (United States); Cogbill, A.H.; Warren, R.G. [Los Alamos National Lab., NM (United States)] [Los Alamos National Lab., NM (United States)

1994-03-10

93

Size-resolved source apportionment of ambient particles by positive matrix factorization at Gosan background site in East Asia  

Microsoft Academic Search

Size- and time-resolved aerosol samples were collected using an eight-stage Davis rotating unit for monitoring (DRUM) sampler from 29 March to 29 May in 2002 at Gosan, Jeju Island, Korea, which is one of the representative background sites in East Asia. These samples were analyzed using synchrotron X-ray fluorescence for 3-h average concentrations of 19 elements consisting of S, Si,

J. S. Han; K. J. Moon; S. J. Lee; Y. J. Kim; S. Y. Ryu; S. S. Cliff; S. M. Yi

2006-01-01

94

Phase I Transport Model of Corrective Action Units 101 and 102: Central and Western Pahute Mesa, Nevada Test Site, Nye County, Nevada with Errata Sheet 1, 2, 3, Revision 1  

SciTech Connect

As prescribed in the Pahute Mesa Corrective Action Investigation Plan (CAIP) (DOE/NV, 1999) and Appendix VI of the Federal Facility Agreement and Consent Order (FFACO) (1996, as amended February 2008), the ultimate goal of transport analysis is to develop stochastic predictions of a contaminant boundary at a specified level of uncertainty. However, because of the significant uncertainty of the model results, the primary goal of this report was modified through mutual agreement between the DOE and the State of Nevada to assess the primary model components that contribute to this uncertainty and to postpone defining the contaminant boundary until additional model refinement is completed. Therefore, the role of this analysis has been to understand the behavior of radionuclide migration in the Pahute Mesa (PM) Corrective Action Unit (CAU) model and to define, both qualitatively and quantitatively, the sensitivity of such behavior to (flow) model conceptualization and (flow and transport) parameterization.

Greg Ruskauff

2009-02-01

95

Orbital forced sea level fluctuations during the Middle Eocene (ODP site 1172, East Tasman Plateau)  

NASA Astrophysics Data System (ADS)

Ocean Drilling Program leg 189 was undertaken to test and refine the hypothesis (by Kennett et al., 1975), that the reconfiguration of continents around Antarctica (e.g.: the opening of the Tasmanian Gateway and Drake passage) led to the onset of the Antarctic Circumpolar Current that, in turn, would cause thermal isolation and hence cooling of Antarctica. This would possibly even cause global cooling, as suggested by the 33.3 Ma Oi1 event. The cores of leg 189, site 1172 on the eastern side of the Tasmanian Gateway provided a nearly complete succession of Eocene and Oligocene sediments. Cyclostratigraphic analysis based on XRF derived Ca and Fe records indicates distinct Milankovitch cyclicity between 40 and 36 Ma. (Röhl et al, in press). In the core-section representing magnetochron 18n-1n, the Ca record shows precession cycles in combination with obliquity, suggested to reflect sea level fluctuations (Röhl et al, in press). New datasets include microfossil data (organic-walled dinoflagellate cysts, pollen/spores and diatoms), loss-on-ignition measurements, magnetic data (environmental magnetics - ARM). Here, we aim to further investigate the proposed relationship between astronomical forcing and sea-level fluctuations. Additionally, we aim to obtain insight in the palaeoecology of the distinct endemic circum-Antarctic late Middle to Late Eocene dinoflagellate cyst assemblages. Results corroborate the concept that the cyclicity recorded by Ca and Fe measurements is the result of sea-level fluctuations. This implies that during late Middle Eocene times, astronomical forcing has modulated sea level - most likely through Antarctic ice buildup and meltdown. In turn, this would indicate the presence of significant, though probably modest, ice masses already ~40 Ma ago, well before the onset of the Antarctic Circumpolar Current. Kennett, J. P., R. E. Houtz, et al. (1975). Development of the circum-Antarctic current. Science 186: 144-147. Röhl, U.; H. Brinkhuis, C.E. Stickley, M. Fuller, S.A. Schellenberg, G. Wefer, G. Williams, Cyclostratigraphy of Middle and Late Eocene sediments from the East Tasman Plateau (site 1172), in press.

Warnaar, J.; Stickley, C.; Jovane, L.; Roehl, U.; Brinkhuis, H.; Visscher, H.

2004-12-01

96

The Impact of Harvesting and Site Preparation on Stormflow and Water Quality in East Texas  

E-print Network

In 1979, nine small forested watersheds were instrumented in East Texas to determine the effect of intensive forest management practices on water quantity and quality. Three replications of three treatments were used: 1) clearcutting - followed...

DeHaven, M. G.; Blackburn, W. H.; Knight, R. W.; Weichert, A. T.

97

Determination of leaf area index of loblolly pine (Pinus taeda L.) and its relationship to site water balance across a large precipitation gradient in East Texas  

E-print Network

The relationship between leaf area index (LAI) and site water balance (SWB) in closed canopy lobiolly pine plantations was analyzed across a natural 50-cm precipitation gradient in East Texas. Six precipitation zones were delineated based upon...

Hebert, Mark Thomas

2012-06-07

98

Seasonal changes in abundances of waterbirds at Sabaki River Mouth (Malindi, Kenya), a key stopover site on the West Asian–East African Flyway  

Microsoft Academic Search

Information on seasonal changes in waterbird numbers in coastal East Africa is limited, but crucial for estimating global flyway populations and targeting conservation efforts. The Sabaki River Mouth is an important site for waterbirds in the region. We counted waterbirds at the site monthly from April 2004 to February 2005. Our counts confirmed the importance of the site for the

Simon Valle; Luigi Boitani

2012-01-01

99

Mars EVA Suit Airlock (MESA)  

NASA Astrophysics Data System (ADS)

The Astrium Space Infrastructure Division has begun an in-house research activity of an Earth-based simulation facility supporting future manned missions to Mars. This research unit will help to prepare and support planned missions in the following ways: 1) to enable the investigation and analysis of contamination issues in advance of a human visit to Mars; 2) as a design tool to investigate and simulate crew operations; 3) to simulate crew operation during an actual mission; 4) to enable on-surface scientific operations without leaving the shirt-sleeve habitation environment ("glove box principle"). The MESA module is a surface EVA facility attached to the main habitation or laboratory module, or mobile pressurized rover. It will be sealed, but not pressurized, and provide protection against the harsh Martian environment. This module will include a second crew airlock for safety reasons. The compartment can also be used to provide an external working bench and experiment area for the crew. A simpler MESA concept provides only an open shelter against wind and dust. This concept does not incorporate working and experimental areas. The principle idea behind the MESA concept is to tackle the issue of contamination by minimizing the decontamination processes needed to clean surface equipment and crew suit surfaces after an EVA excursion prior to the astronaut re-entering the habitable area. The technical solution envisages the use of a dedicated crew suit airlock. This airlock uses an EVA suit which is externally attached by its back-pack to the EVA compartment area facing the Martian environment. The crew donns the suit from inside the habitable volume through the airlock on the back of the suit. The surface EVA can be accomplished after closing the back-pack and detaching the suit. A special technical design concept foresees an extendable suit back-pack, so that the astronaut can operate outside and in the vincinity of the module. The key driver in the investigation is the problem of contamination of the habitable volume by EVA and sampling activities and the transport of Earth-generated contaminants to Mars.

Ransom, Stephen; Böttcher, Jörg; Steinsiek, Frank

100

Completion Report for Well ER-EC-12 Corrective Action Units 101 and 102: Central and Western Pahute Mesa  

SciTech Connect

Well ER-EC-12 was drilled for the U.S. Department of Energy, National Nuclear Security Administration Nevada Site Office in support of the Nevada Environmental Restoration Project at the Nevada National Security Site (formerly known as the Nevada Test Site), Nye County, Nevada. The well was drilled in June and July 2010 as part of the Pahute Mesa Phase II drilling program. The primary purpose of the well was to provide detailed hydrogeologic information in the Tertiary volcanic section in the area between Pahute Mesa and the Timber Mountain caldera complex that will help address uncertainties within the Pahute Mesa–Oasis Valley hydrostratigraphic model. In particular, the well was intended to help define the structural position and hydraulic parameters for volcanic aquifers potentially down-gradient from historic underground nuclear tests on Pahute Mesa. It may also be used as a long-term monitoring well.

NSTec Environmental Management

2011-04-30

101

A New High-Precision Paleomagnetic Reference Vector From Mesa El Burro, Mesa Cartabón, and Mesa El Pinole, Baja California for the Tuff of San Felipe, a Miocene Ignimbrite Marker Bed Exposed in Baja California and Sonora, México  

NASA Astrophysics Data System (ADS)

High precision paleomagnetic vectors from regional ignimbrite markers are valuable for quantifying distributed shear deformation in plate boundary zones. In central Baja California, we measured a new high- precision paleomagnetic reference vector for the 12.50 Ma Tuff of San Felipe (Tsf), a regionally-extensive Miocene ignimbrite deposit which blanketed >4000km2 of present day northeastern Baja California and western Sonora (Oskin and Stock, 2003) prior to the opening of the northern Gulf of California. This new reference location is west of both the main Gulf topographic escarpment and the San Pedro Martír fault that marks the western edge of the Gulf Extensional Province. Because this reference location has remained tectonically stable since the eruption and deposition of Tsf, the paleomagnetic vector measured here is a good estimate of the magnetic field at the time Tsf cooled below the Curie temperature. We selected three mesas capped by Tsf for paleomagnetic sampling: Mesa El Burro 1 km south of El Metate, Mesa Cartabón 9 km southwest of El Metate, and Mesa El Pinole 20 km northwest of El Metate. These mesas are capped by 10-30 m of the Tuff of San Felipe and are amongst the most western exposures of this ignimbrite documented in Baja California. In the area of these mesas, Tsf was deposited on a generally flat landscape with minor paleo-topography incised into 15-110 m of coarse sedimentary rocks. These strata nonconformably overlie a variety of plutonic and metamorphic basement rocks. Locally, Tsf infills westward- draining paleo-drainages carved into the still-horizontal underlying conglomerates. 50 randomly-oriented cores were drilled in Tsf at these three mesas and 48 of these cores together yield a mean direction of 212.4° declination, -3.0° inclination with an ?-95 confidence of 1.33°. This direction lies well off of the expected Miocene paleo-pole position and records an apparent geomagnetic excursion during reversed polarity subchron C5Ar.2r (Stock et al., 1999). This unique magnetic signature strengthens the utility of this ignimbrite as a regional tectonic marker. The declination measured at these mesas is ~6° counter-clockwise of the Mesa Cuadrada Tsf reference site in the Sierra San Felipe. This finding increases the amount of distributed dextral shear recorded by rotation of Tsf on the margins of the Gulf of California.

Bennett, S. E.; Oskin, M. E.

2008-12-01

102

Service Integration in Colorado: Connecting Programs To Provide Better Services in Mesa and El Paso Counties.  

ERIC Educational Resources Information Center

Efforts to integrate the delivery of human service programs (HSP) in Colorado's El Paso County and Mesa County were examined through site visits and meetings with 34 members of HSP staff in both counties. The site visits confirmed that staff and management of HSP in both counties have implemented a series of client-centered processes to provide…

Ragan, Mark

103

Revised Hydrogeology for the Suprabasalt Aquifer System, 200-East Area and Vicinity, Hanford Site, Washington  

SciTech Connect

This study supports the Hanford Groundwater/Vadose integration project objectives to better understand the risk of groundwater contamination and potential risk to the public via groundwater flow paths. The primary objective of this study was to refine the conceptual groundwater flow model for the 200-East Area and vicinity.

Williams, Bruce A.; Bjornstad, Bruce N.; Schalla, Ronald; Webber, William D.

2000-04-20

104

Assessment of the spatio-temporal distribution of soil properties in East Kolkata wetland ecosystem (A Ramsar site: 1208)  

NASA Astrophysics Data System (ADS)

The present investigation was made to characterize spatial and temporal variations in soil properties and to evaluate possible differences that could be dependent on the tannery effluent discharges, municipal sewage discharges, vegetation cover, soil settlement rate, crop rotation, etc. Soil total organic matter (TOM), cations like, Sodium (Na), Ammonium (NH4), Potassium (K), Calcium (Ca) and Magnesium (Mg) contents in the bank soils and bottom sediments were recorded from seven different characteristic sites in East Kolkata wetland ecosystem, a Ramsar site (Ramsar site No. 1208). The profile maps were constructed by geostatistical methods to describe the spatial distribution as well as temporal variations of all the factors to identify the influences of composite wastewaters. The work was initiated to identify causes and consequences of the waste dumping in the concerned region for the past hundred years and thereby to suggest necessary precautionary measures to prevent further loss of soil quality.

Pal, S.; Manna, S.; Aich, A.; Chattopadhyay, B.; Mukhopadhyay, S. K.

2014-06-01

105

The cranial analysis of eight skulls from collective grave of the Early Bronze Age Vucedol site (East Slavonia, Croatia).  

PubMed

The collective grave of the Vucedol culture signed as "grave 3/1985" with skeletons of eight persons, represents the most important burial of this culture on the eponimic site in East Croatia, with several indications of human sacrifice. Anthropological and radiological analysis were performed on crania remains of the individuals, specifically on the skulls of one male and seven females. Nondestructive methods embraced craniometrical analysis, analysis of cranial non-metric traits and multivariate distance analysis, with a help of radiological methods, to detect every distinct anatomical characteristic of the skulls. All methods used in this work tried to present similarities and a possible homogeneity of the analysed individuals. PMID:23697278

Hincak, Zdravka; Cavalli, Fabio; Durman, Aleksandar

2013-03-01

106

Holocene Sites North-East of Lake Turkana: A Preliminary Report  

Microsoft Academic Search

Mr Barthelme is engaged in research for a Ph.D. degree for the University of California at Berkeley. His work, of which this is a preliminary report, has been undertaken under the auspices of the Koobi Fora Research Project of the National Museums of Kenya.SummaryThe area to the north-east of Lake Turkana has proved to be extremely rich in archaeological material.

John Barthelme

1977-01-01

107

Source identification and apportionment of halogenated compounds observed at a remote site in East Asia.  

PubMed

The sources of halogenated compounds in East Asia associated with stratospheric ozone depletion and climate change are relatively poorly understood. High-precision in situ measurements of 18 halogenated compounds and carbonyl sulfide (COS) made at Gosan, Jeju Island, Korea, from November 2007 to December 2011 were analyzed by a positive matrix factorization (PMF). Seven major industrial sources were identified from the enhanced concentrations of halogenated compounds observed at Gosan and corresponding concentration-based source contributions were also suggested: primary aluminum production explaining 37% of total concentration enhancements, solvent usage of which source apportionment is 25%, fugitive emissions from HCFC/HFC production with 11%, refrigerant replacements (9%), semiconductor/electronics industry (9%), foam blowing agents (6%), and fumigation (3%). Statistical trajectory analysis was applied to specify the potential emission regions for seven sources using back trajectories. Primary aluminum production, solvent usage and fugitive emission sources were mainly contributed by China. Semiconductor/electronics sources were dominantly located in Korea. Refrigerant replacement, fumigation and foam blowing agent sources were spread throughout East Asian countries. The specified potential source regions are consistent with country-based consumptions and emission patterns, verifying the PMF analysis results. The industry-based emission sources of halogenated compounds identified in this study help improve our understanding of the East Asian countries' industrial contributions to halogenated compound emissions. PMID:24298975

Li, Shanlan; Kim, Jooil; Park, Sunyoung; Kim, Seung-Kyu; Park, Mi-Kyung; Mühle, Jens; Lee, Gangwoong; Lee, Meehye; Jo, Chun Ok; Kim, Kyung-Ryul

2014-01-01

108

Mesa VerdeMesa Verde Pueblo II AD 900 to 1150  

E-print Network

· On Mesa Verde itself h l f l ki· Much larger, formal masonry kivas · Planned roomblock architecture roomblocksBigger roomblocks · Full masonry architecture by late 1000s f f li i· Large front rooms for living living area · Late PII ­ masonry lined, with pilasters & benches · "Keyhole" shaped kiva in Mesa Verde

Wolverton, Steve

109

Modelling soil moisture for a grassland and a woodland site in south-east England Hydrology and Earth System Sciences, 6(1), 3947 (2002) EGS  

E-print Network

Modelling soil moisture for a grassland and a woodland site in south-east England 39 Hydrology and Earth System Sciences, 6(1), 39­47 (2002) © EGS Modelling soil moisture for a grassland and a woodland at Wallingford (1995-1997). Detailed soil moisture measurements were available at a grassland site and a woodland

Paris-Sud XI, Université de

110

EAST AFRICA EAST AFRICA  

E-print Network

EAST AFRICA #12;EAST AFRICA Investment Invested in research and student programs in East Africa $2.7+million SHARCNET Access granted to all partner universities in East Africa CIDA UPCD project, Rebuilding of The Africa Institute at The University of Western Ontario (2011) #12;EAST AFRICA Recruitment and Building

Denham, Graham

111

In-Situ Air Permeability Measurements Using the Cone Permeameter at the 200 East Area of the Hanford Site  

SciTech Connect

This report documents the field demonstration of the Cone Permeameter{trademark} (CPer) conducted at the Immobilization Low-Activity Waste (ILAW) site in the 200 East area of the Department of Energy's (DOE) Hanford facility. The demonstration was conducted using the Hanford Site Cone Penetration Platform (CPP) shown in Figure 1.1. The purpose of the technology demonstration was to (1) gather baseline data and evaluate the CPer's ability to measure air permeability in arid sands, silts and gravels; and (2) to determine the system's ability to replicate permeability profiles with multiple pushes in close proximity. The demonstration was jointly conducted by Applied Research Associates, Inc. (ARA) and Science and Engineering Associates (SEA). This report satisfies the requirements of ARA's contract No.2075 to Lockheed Martin Hanford Company. The report is organized into six major sections. This first section presents an introduction and outline to the report. Section 2 contains a discussion of the technologies used for the demonstration. Section 3 contains a brief description of the site where the demonstration was conducted. Section 4 describes the testing methodology and chronology. Section 5 presents the results obtained during the field test program. Comparisons between these results and existing site data are developed and discussed in Section 5. A conclusion and recommendation section is presented in Section 6 of the report.

TROYER, G.L.

1999-03-31

112

Survey of radon and radon daughter concentrations in selected Rainier Mesa tunnels  

Microsoft Academic Search

A survey of radon and radon daughter concentrations (RDCs) in selected tunnels on Rainier Mesa at the Nevada Test Site (NTS) was conducted as a part of the underground testing program at NTS. Measurements were taken in three tunnels, N, T, and G. Results of preliminary measurements indicate that N and T Tunnels have low RDCs, i.e., 0.01 WL (working

Fauver

1987-01-01

113

Wet deposition of black carbon at a remote site in the East China Sea  

NASA Astrophysics Data System (ADS)

concentrations of black carbon (BC) in air (MBC) and rainwater (CBC) in the East China Sea were measured at Hedo on Okinawa Island, Japan, from April 2010 to March 2013. The monthly averaged MBC and CBC showed marked seasonal variations, being highest in spring (0.32 ± 0.13 µg m-3 and 92 ± 76 µg L-1, respectively) and lowest in summer (0.06 ± 0.03 µg m-3 and 8.0 ± 4.1 µg L-1, respectively). The high MBC and CBC in spring were associated with transport of air masses from the Asian continent by northwesterly winds. The BC wet deposition flux (FBC), estimated as the product of CBC and precipitation amount, also showed a distinct seasonal variation. The monthly average FBC during the four spring seasons (16.8 ± 6.7 mg m-2 month-1) was about 3 times higher than the annual average FBC (5.5 ± 9.9 mg m-2 month-1) owing to the high CBC and precipitation amount in spring. As a result, about 76% of the annual BC deposition occurred in spring on average. The FBC in spring is comparable to the average BC net flux in North China, indicating the importance of precipitation over the East China Sea as a sink of BC transported from North China. In summer, CBC values were correlated with MBC for rain events associated with local convective activity, as identified by the convective available potential energy. A one-dimensional thermodynamic model successfully explained the relation between CBC and MBC.

Mori, T.; Kondo, Y.; Ohata, S.; Moteki, N.; Matsui, H.; Oshima, N.; Iwasaki, A.

2014-09-01

114

Soil-site relationships for natural stands of longleaf pine (Pinus palustris Mill.) in east Texas  

E-print Network

the longleaf pine forest is reduced to about one-third its original acreage as a result of overcutting, fire pro- tection, grazing of young stands by hogs, and brown-spot needle disease in seedlings (Wahlenberg, 1946). Longleaf pine, a fire subclimax..., 1956; and Vincent, 1961) . These assumptions include: (1) the entire range of sites within each age class must be sampled, (2) site difference effects upon height growth must be the same at all ages, and (3) growth curves between good and bad sites...

Larson, Eric Hays

1971-01-01

115

Addendum to the East Tennessee Technology Park Site-Wide Residual Contamination Remedial Investigation Work Plan Oak Ridge, Tennessee  

SciTech Connect

The East Tennessee Technology Park Site-Wide Residual Contamination Remedial Investigation Work Plan (DOE 2004) describes the planned fieldwork to support the remedial investigation (RI) for residual contamination at the East Tennessee Technology Park (ETTP) not addressed in previous Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA) decisions. This Addendum describes activities that will be conducted to gather additional information in Zone 1 of the ETTP for groundwater, surface water, and sediments. This Addendum has been developed from agreements reached in meetings held on June 23, 2010, August 25, 2010, October 13, 2010, November 13, 2010, December 1, 2010, and January 13, 2011, with representatives of the U. S. Department of Energy (DOE), U. S. Environmental Protection Agency (EPA), and Tennessee Department of Environment and Conservation (TDEC). Based on historical to recent groundwater data for ETTP and the previously completed Sitewide Remedial Investigation for the ETTP (DOE 2007a), the following six areas of concern have been identified that exhibit groundwater contamination downgradient of these areas above state of Tennessee and EPA drinking water maximum contaminant levels (MCLs): (1) K-720 Fly Ash Pile, (2) K-770 Scrap Yard, (3) Duct Island, (4) K-1085 Firehouse Burn/J.A. Jones Maintenance Area, (5) Contractor's Spoil Area (CSA), and (6) Former K-1070-A Burial Ground. The paper presents a brief summary of the history of the areas, the general conceptual models for the observed groundwater contamination, and the data gaps identified.

SAIC

2011-04-01

116

13. VIEW OF WESTERN CANAL EAST OF CARRIAGE LANE IN ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

13. VIEW OF WESTERN CANAL EAST OF CARRIAGE LANE IN TEMPE, SHOWING DROP STRUCTURE AND GROUNDWATER PUMP. THIS IS THE LAST OF FOUR PUMPS WHICH FEED DIRECTLY INTO THE CANAL BETWEEN ALMA SCHOOL ROAD AND PRICE ROAD. ON THIS DAY, ALL FOUR PUMPS, OPERATING AT FULL OUTPUT, HAVE CONSIDERABLY SWELLED THE FLOW TO THE CANAL. NOTE THE OLD FASHIONED BRICKWORK ON THE NORTH BANK. - Western Canal, South side of Salt River between Tempe, Phoenix & Mesa, Mesa, Maricopa County, AZ

117

Vertebrate fossils excavated from the Bol'shoj Naryn site, East Siberia  

Microsoft Academic Search

Located at approximately 53°N, 103°E, the Bol'shoj Naryn site lies on the hills facing Osa Bay, in the Bratsk Reservoir. The authors started excavating this site in 2003. By 2005, we had found 337 stone tools and flakes, and more than 600 animal fossils, from the paleosol layers (14C dating: from 25,000 to 32,000yrBP) deposited in the second half of

Takao Sato; Fedora Khenzykhenova; Kunio Yoshida; Dai Kunikita; Kenji Suzuki; Ekaterina Lipnina; German Medvedev; Hirofumi Kato

2008-01-01

118

Discovery of Off-Axis Melt Lenses at the RIDGE-2000 East Pacific Rise Integrated Studies Site  

NASA Astrophysics Data System (ADS)

The first multi-streamer 3D seismic reflection experiment conducted aboard the R/V Marcus Langseth was carried out in July-August 2008 at the RIDGE-2000 Integrated Studies Site at the East Pacific Rise between 9°37'N and 9°57'N. One of the major findings of this cruise is the presence of at least three regions with prominent near-axis crustal reflectors that we interpret as off-axis melt lenses (OAML) injected at mid-crustal levels to both the east and west of the ridge crest. In some instances these regions are associated with subtle topographic expressions of seafloor volcanism. The first set of OAML reflections was discovered near 9° 54'N at distances from the ridge axis that range from ~4 to ~7 km, and extending ~6.3 km in the ridge-parallel direction. Two-way travel times from the seafloor to the OAML are 750-830 ms, which correspond to depths of ~1,800-2,000 m (assuming an average upper crustal velocity of 4.7 km/s), although in some cases there is evidence for deeper (~1,420 ms, or ~3,330 m) reflections farther off-axis forming a staircase-like system of melt lenses. A second set of OAML reflections was discovered further south near 9° 39'N also within 3-6 km east of the spreading axis, and extending ~3.3 km in the ridge-parallel direction. Crustal travel times to these OAML reflections are 710-830 ms (1,700-2,000 m below seafloor). In this region the OAML is locally underlain by deeper reflections at depths of 1,300 ms (~3,100 m) that could indicate off-axis melt sill intrusions at multiple levels. A smaller OAML was found within 2 km west of the axis near 9° 52'N. In this paper we present preliminary cross-sections of this dataset to evaluate the extent and general characteristics of these off-axis events, which highlight the importance of off-axis magmatism in crustal accretion along this section of the East Pacific Rise.

Canales, J.; Carbotte, S. M.; Mutter, J. C.; Nedimovi?, M. R.; Carton, H.; Xu, M.; Newman, K.; Aghaei, O.; Marjanovi?, M.; Stowe, L.

2008-12-01

119

Establishment of control site baseline data for erosion studies using radionuclides: a case study in East Slovenia.  

PubMed

The aim of the present study was to establish a reference site and its soil characteristics for use of fallout radionuclides in erosion studies in Slovenia. Prior to this study, no reference site and baseline data existed for Slovenia for this purpose. In the agricultural area of Goricko in East Slovenia, an undisturbed forest situated in Salamenci (46 degrees 44'N, 16 degrees 7'E), was selected to establish the inventory value of fallout 137Cs and to establish a baseline level of multi-elemental fingerprint (major, minor, trace elements including heavy metals) and naturally occurring radionuclides in soils. A total of 20 soil profiles were collected at four 10 cm depth increments for evaluation of baseline level of 137Cs inventory. An exponential distribution for 137Cs was found and the baseline level inventory was established at 7300 +/- 2500 Bq m-2 with a coefficient of variation of 34%. Of this mean present-day inventory, approximately 45% is due to the Chernobyl contribution. The physical degradation of soils through erosion is linked with biochemical degradation. This study introduces an approach to establishment of the naturally occurring radionuclide and elemental fingerprints baseline levels at a reference site which can provide comparative data to those from neighbouring agricultural fields for assessment of soil redistribution magnitude using fallout radionuclides. In addition, this information will be used to determine the impact of soil erosion processes and agricultural practices on soil quality and redistribution within agricultural landscapes in Slovenia. PMID:20687248

Mabit, Lionel; Martin, Paul; Jankong, Patcharin; Toloza, Arsenio; Padilla-Alvarez, Roman; Zupanc, Vesna

2010-10-01

120

Establishment of control site baseline data for erosion studies using radionuclides: a case study in East Slovenia.  

PubMed

The aim of the present study was to establish a reference site and its soil characteristics for use of fallout radionuclides in erosion studies in Slovenia. Prior to this study, no reference site and baseline data existed for Slovenia for this purpose. In the agricultural area of Gori?ko in East Slovenia, an undisturbed forest situated in Šalamenci (46°44'N, 16°7'E), was selected to establish the inventory value of fallout (137)Cs and to establish a baseline level of multi-elemental fingerprint (major, minor, trace elements including heavy metals) and naturally occurring radionuclides in soils. A total of 20 soil profiles were collected at four 10 cm depth increments for evaluation of baseline level of (137)Cs inventory. An exponential distribution for (137)Cs was found and the baseline level inventory was established at 7300 ± 2500 Bq m(-2) with a coefficient of variation of 34%. Of this mean present-day inventory, approximately 45% is due to the Chernobyl contribution. The physical degradation of soils through erosion is linked with biochemical degradation. This study introduces an approach to establishment of the naturally occurring radionuclide and elemental fingerprints baseline levels at a reference site which can provide comparative data to those from neighbouring agricultural fields for assessment of soil redistribution magnitude using fallout radionuclides. In addition, this information will be used to determine the impact of soil erosion processes and agricultural practices on soil quality and redistribution within agricultural landscapes in Slovenia. PMID:20965104

Mabit, Lionel; Martin, Paul; Jankong, Patcharin; Toloza, Arsenio; Padilla-Alvarez, Roman; Zupanc, Vesna

2010-06-01

121

THE ERUPTIVE MECHANISM OF THE PEFUDOT MESA VENT,  

E-print Network

Laboratory, Los Alamos, NM 87545 Figure 1 . Location map of Peridot Mesa and road log for the field trip INTRODUCTION the vent are of great interest and will be discussed as two The Peridot Mesa Vent belongs diatreme-like vents of which Peridot Mesa is the best studied. The vents erupted tuff rings of pyroclastic

122

Changes in Nematode Communities in Different Physiographic Sites of the Condor Seamount (North-East Atlantic Ocean) and Adjacent Sediments  

PubMed Central

Several seamounts are known as ‘oases’ of high abundances and biomass and hotspots of biodiversity in contrast to the surrounding deep-sea environments. Recent studies have indicated that each single seamount can exhibit a high intricate habitat turnover. Information on alpha and beta diversity of single seamount is needed in order to fully understand seamounts contribution to regional and global biodiversity. However, while most of the seamount research has been focused on summits, studies considering the whole seamount structure are still rather poor. In the present study we analysed abundance, biomass and diversity of nematodes collected in distinct physiographic sites and surrounding sediments of the Condor Seamount (Azores, North-East Atlantic Ocean). Our study revealed higher nematode biomass in the seamount bases and values 10 times higher in the Condor sediments than in the far-field site. Although biodiversity indices did not showed significant differences comparing seamount sites and far-field sites, significant differences were observed in term of nematode composition. The Condor summit harboured a completely different nematode community when compared to the other seamount sites, with a high number of exclusive species and important differences in term of nematode trophic diversity. The oceanographic conditions observed around the Condor Seamount and the associated sediment mixing, together with the high quality of food resources available in seamount base could explain the observed patterns. Our results support the hypothesis that seamounts maintain high biodiversity through heightened beta diversity and showed that not only summits but also seamount bases can support rich benthic community in terms of standing stocks and diversity. Furthermore functional diversity of nematodes strongly depends on environmental conditions link to the local setting and seamount structure. This finding should be considered in future studies on seamounts, especially in view of the potential impacts due to current and future anthropogenic threats. PMID:25541988

Zeppilli, Daniela; Bongiorni, Lucia; Serrão Santos, Ricardo; Vanreusel, Ann

2014-01-01

123

Changes in nematode communities in different physiographic sites of the condor seamount (north-East atlantic ocean) and adjacent sediments.  

PubMed

Several seamounts are known as 'oases' of high abundances and biomass and hotspots of biodiversity in contrast to the surrounding deep-sea environments. Recent studies have indicated that each single seamount can exhibit a high intricate habitat turnover. Information on alpha and beta diversity of single seamount is needed in order to fully understand seamounts contribution to regional and global biodiversity. However, while most of the seamount research has been focused on summits, studies considering the whole seamount structure are still rather poor. In the present study we analysed abundance, biomass and diversity of nematodes collected in distinct physiographic sites and surrounding sediments of the Condor Seamount (Azores, North-East Atlantic Ocean). Our study revealed higher nematode biomass in the seamount bases and values 10 times higher in the Condor sediments than in the far-field site. Although biodiversity indices did not showed significant differences comparing seamount sites and far-field sites, significant differences were observed in term of nematode composition. The Condor summit harboured a completely different nematode community when compared to the other seamount sites, with a high number of exclusive species and important differences in term of nematode trophic diversity. The oceanographic conditions observed around the Condor Seamount and the associated sediment mixing, together with the high quality of food resources available in seamount base could explain the observed patterns. Our results support the hypothesis that seamounts maintain high biodiversity through heightened beta diversity and showed that not only summits but also seamount bases can support rich benthic community in terms of standing stocks and diversity. Furthermore functional diversity of nematodes strongly depends on environmental conditions link to the local setting and seamount structure. This finding should be considered in future studies on seamounts, especially in view of the potential impacts due to current and future anthropogenic threats. PMID:25541988

Zeppilli, Daniela; Bongiorni, Lucia; Serrão Santos, Ricardo; Vanreusel, Ann

2014-01-01

124

A craniometrical analysis of the Early Bronze Age dogs from Vucedol site (East Slavonia, Croatia).  

PubMed

During archaeological campaigne on Vucedol site 7 crania and cranial fragments together with 10 halfs of lower jaws were found. Due to existance of crania and lower jaws damages and therefore lack of preserved craniometrical points, it was not possible to measure the same craniometrical lengths on all the samples. Apart from craniometrical measurements, 6 craniometrical indices and ratios were calculated. Comparison of calculated values and values of craniometrical indices and ratios identify dog's crania from Vucedol site as dolichocephalic cranial type. Mutual comparison of all analyzed craniometrical values for crania and lower jaws of dog's crania don't show a significant difference in size and ratios of individual measures, nor significant deviation in value of the samples of other Vucedol culture sites. This point out on type of dogs with similar appearance which tallness and form respond to smaller dog's breed, in the first place a type of Croatian sheepdog or Hungarian Mudi. PMID:23697279

Miheli?, Damir; Pavi?, Mirela; Hincak, Zdravka

2013-03-01

125

Muskox site fidelity and group cohesion in Jameson Land, East Greenland  

Microsoft Academic Search

Increasing hunting pressure in Greenland demands improved knowledge on muskox ( Ovibos moschatus) biology in general, and movement and grouping behaviour in particular, to ensure their proper management. Improving the exchange of information between hunters and managers is also necessary. Muskox site fidelity and group cohesion was examined over a 16-year period using 477 earmarked individuals tagged in 1982 and

Peter Aastrup

2003-01-01

126

A geophysical-geological transect of the Silent Canyon caldera complex, Pahute Mesa, Nevada  

NASA Astrophysics Data System (ADS)

Revision of lithological logs for boreholes penetrating the volcanic center at Pahute Mesa, Nevada, has led to a thorough review of the volcanic stratigraphy and geologic structure. We have combined this review with a compilation of old and newly acquired gravity and seismic travel time data, producing a unified interpretation along a northwest to sutheast profile. The analysis supports a new interpretation of the Silent Canyon caldera complex. The caldera is found to be more asymmetric than previously suggested, with the southeastern boundary formed by linear, high-angle normal faultsand a more gently sloping northwestern boundary. The total thickness of volcanic units within the caldera complex does not appear to exceed 5 km. The shallow structure at Pahute Mesa could have a profound effect on the seismic response for regional and teleseismic signals from this nuclear test site. The Silent Canyon caldera complex is actually a set of nested calderas first filled by thick (greater than 1 km) postcaldera lavas and subsequently buried by outflow sheets of the Timber Mountain caldera to the south. Thick, postcaldera lavas filled a half-graben structure formed west of the West Greeley fault, dropping the tops of the youngest caldera-forming units to depths in excess of 2 km. Therefore the western boundary of the caldera complex is poorly defined. East of the West Greeley fault, two overlapping calderas are defined, and stratigraphic data suggest the presence of even older calderas. The youngest caldera, the calc-alkaline Area 20 caldera, is well defined from drill hole data. The Area 20 caldera overlaps the 13.6 Ma peralkaline Grouse Canyon caldera, which is less well defined, but apparently collapsed in trap-door style along the Almendro fault. For both these calderas, collapse continued after the main caldera-forming eruption, concurrent with the accumulation of thick (greater than 1 km) lavas within the peripheral collapse zones. The geophysical interpretation indicates that the major structural boundary of the caldera complex corresponds to the NNE trending Scrugham Peak and Almendro faults, which offset the pre-Tertiary contact more than 1 km but have less than 200 m offset in rocks of 11 Ma age. Drill hole data show that offsets along these faults increase systematically within older (up to 15 Ma) units, which are commonly rotated eastward in a style similar to units at the surface. Abrupt changes in the subsurface thickness of the caldera-forming units occur across the faults, indicating that these linear features served as caldera boundaries.

Ferguson, John F.; Cogbill, Allen H.; Warren, Richard G.

1994-03-01

127

USGS Researcher at Mesa Alta, New Mexico  

USGS Multimedia Gallery

USGS researcher Craig Allen stands on the edge of Mesa Alta, amid diverse forest and woodland in the uplands of northern New Mexico; note some recently dead ponderosa pine and Douglas-fir in the field of view. Forest drought stress is strongly correlated with tree mortality from poor growth, bark be...

128

A newly identified splice site mutation in ZMPSTE24 causes restrictive dermopathy in the Middle East.  

PubMed

Restrictive dermopathy (RD) is a severe neonatal inherited skin syndrome of which children die shortly after birth. Clinical features include intrauterine growth retardation, taut translucent and easily eroded skin, multiple joint ankylosis and distinct facial features. RD is usually caused by homozygous or compound heterozygous mutations in ZMPSTE24, predicted to cause loss of function of the encoded zinc metalloproteinase STE24. ZMPSTE24 is essential for the processing of the nuclear intermediate filament protein prelamin A. We report two distantly related children from the United Arab Emirates with RD. Remarkably, they lived up to 2 months, suggesting some residual function of the mutant protein. We sought to confirm the diagnosis by thorough microscopic analysis of patient skin, to identify the causative mutation and to study its functional consequences. A skin biopsy was obtained and processed for light and electron microscopy. Peripheral blood leucocytes were used for DNA and RNA isolation, and detection of prelamin A by immunofluorescence. Analysis of the skin confirmed the earlier reported densely packed collagen bundles and lack of elastin fibres. In both patients a homozygous splice site mutation c.627+1G>C in ZMPSTE24 was identified. Analysis of the ZMPSTE24 mRNA revealed an in-frame exon 5 skipping. Accumulation of prelamin A could be detected at the nuclear envelope of patient blood lymphocytes. We thus report the first splice site mutation in ZMPSTE24, which is likely to be a founder mutation in the United Arab Emirates. The accumulation of prelamin A at the nuclear periphery is consistent with defective ZMPSTE24 function. Interestingly, a regular blood sample can be used to investigate prelamin A accumulation. PMID:18671782

Sander, C S; Salman, N; van Geel, M; Broers, J L V; Al-Rahmani, A; Chedid, F; Hausser, I; Oji, V; Al Nuaimi, K; Berger, T G; Verstraeten, V L R M

2008-09-01

129

Characterization of nutrients in the atmospheric wet and dry deposition observed at the two monitoring sites over Yellow Sea and East China Sea  

Microsoft Academic Search

To investigate the atmospheric deposition of nutrients into the coastal and shelf regions of the northwest Pacific Ocean,\\u000a observation sites were established upon Qianliyan Island (within the Yellow Sea) and the Shengsi Archipelago (within the East\\u000a China Sea), respectively. Nutrient concentrations, including $$ {\\\\text{NH}}^{ + }_{4} ,{\\\\text{NO}}^{ - }_{3} ,{\\\\text{NO}}^{ - }_{2} ,{\\\\text{PO}}^{{3 - }}_{4} {\\\\text{ and SiO}}^{{2 - }}_{3}

Guosen Zhang; Jing Zhang; Sumei Liu

2007-01-01

130

Spatial and temporal variability of snow accumulation in Dronning Maud Land, East Antarctica, including two deep ice coring sites at Dome Fuji and EPICA DML  

Microsoft Academic Search

To better understand the spatio-temporal variability of the glaciological environment in Dronning Maud Land (DML), East Antarctica, investigations were carried out along the 2800-km-long Japanese-Swedish IPY 2007\\/2008 traverse. The route covers ice sheet ridges and two deep ice coring sites at Dome Fuji and EPICA DML. The surface mass balance (SMB) distribution was derived based on analysis of isochrones within

S. Fujita; P. Holmlund; I. Andersson; I. Brown; H. Enomoto; Y. Fujii; K. Fujita; K. Fukui; T. Furukawa; M. Hansson; K. Hara; Y. Hoshina; M. Igarashi; Y. Iizuka; S. Imura; S. Ingvander; T. Karlin; H. Motoyama; F. Nakazawa; H. Oerter; L. E. Sjöberg; S. Sugiyama; S. Surdyk; J. Ström; R. Uemura; F. Wilhelms

2011-01-01

131

Time-Series Chemical and Temperature Habitat Characterization of Diffuse-Flow Hydrothermal Sites at 9°50'N East Pacific Rise Using an Autonomous Analyzer  

Microsoft Academic Search

Sulfide, oxygen and temperature were monitored during 6 deployments of an in-situ electrochemical analyzer between December 2003 and January 2007 in diffuse-flow sites at the 9°50'N East Pacific Rise hydrothermal vent field for up to two weeks at a time. Sensors were placed near the mussel Bathymodiolus thermophilus, and the tubeworms Riftia pachyptila and Tevnia jerichonana to monitor the physical

T. S. Moore; D. B. Nuzzio; T. M. Shank; G. W. Luther

2008-01-01

132

Tank Leak Experiment at the Mock Tank Site, 200 East Area: Electrical Resistance Tomography-Preliminary Results  

SciTech Connect

Electrical resistance measurements were used to monitor several releases of brine from the Mock Tank Test site at the 200 East Area. Three different methods were used to analyze the data: (1) a simple average of the raw data was used as an indicator of the presence/absence of a leak, (2) tomography of the region beneath the tank using data from steel-cased borehole, and (3) tomography of the region beneath the tank using data from vertical electrode arrays. Each of these methods was able to detect the presence of what appeared to be conductive plumes forming beneath the tank. The results suggest the following: (1) The minimum detectable leak volume is of the Order of a few hundred gallons. (2) procedure involving the use of reciprocal data can be used to evaluate the reliability of the results and minimize the potential for false-positive and false-negative conclusions; (3) The dry wells may be used as long electrodes to obtain 2D images of the plume under the tank. (4) 3D electrical resistance tomography (ERT) images provide information that can be used to determine the released volume, the speed and direction of plume movement, the regions of the soil that are being contaminated, and the approximate location of the hole in the tank. (5) It may be possible to map pre-existing plumes when no pre-spill data exists. (6) A ''quick look'' calculation can be used in the field can reliably detect the occurrence of a leak.

Ramirez, A; Daily, W; Binley, A

2002-01-18

133

A Historical Evaluation of the U12t Tunnel, Nevada Test Site, Nye County, Nevada, Volume 6 of 6  

SciTech Connect

This report presents a historical evaluation of the U12t Tunnel on the Nevada Test Site in southern Nevada. The work was conducted by the Desert Research Institute at the request of the U.S. Department of Energy, National Nuclear Security Administration Nevada Site Office and the U.S. Department of Defense, Defense Threat Reduction Agency (DTRA). The U12t Tunnel is one of a series of tunnels used for underground nuclear weapons effects tests on the east side of Rainier and Aqueduct Mesas. Six nuclear weapons effects tests, Mint Leaf, Diamond Sculls, Husky Pup, Midas Myth/Milagro, Mighty Oak, and Mission Ghost, and one high explosive test, SPLAT, were conducted within the U12t Tunnel from 1970 to 1987. All six of the nuclear weapons effects tests and the high explosive test were sponsored by DTRA. Two conventional weapons experiments, Dipole Knight and Divine Eagle, were conducted in the tunnel portal area in 1997 and 1998. These experiments were sponsored by the Defense Special Weapons Agency. The U12t Tunnel complex is composed of the Portal and Mesa Areas and includes an underground tunnel with a main access drift and nine primary drifts, a substantial tailings pile fronting the tunnel portal, a series of discharge ponds downslope of the tailings pile, and two instrumentation trailer parks and 16 drill holes on top of Aqueduct Mesa. A total of 89 cultural features were recorded: 54 at the portal and 35 on the mesa. In the Portal Area, cultural features are mostly concrete pads and building foundations; other features include the portal, rail lines, the camel back, ventilation and cooling system components, communication equipment, and electrical equipment. On the mesa are drill holes, a few concrete pads, a loading ramp, and electrical equipment.

Harold Drollinger; Robert C. Jones; and Thomas F. Bullard; Desert Research Institute, Laurence J. Ashbaugh, Southern Nevada Courier Service and Wayne R. Griffin, Stoller-Navarro Joint Venture

2009-02-01

134

A Historical Evaluation of the U12t Tunnel, Nevada Test Site, Nye County, Nevada, Volume 4 of 6  

SciTech Connect

This report presents a historical evaluation of the U12t Tunnel on the Nevada Test Site in southern Nevada. The work was conducted by the Desert Research Institute at the request of the U.S. Department of Energy, National Nuclear Security Administration Nevada Site Office and the U.S. Department of Defense, Defense Threat Reduction Agency (DTRA). The U12t Tunnel is one of a series of tunnels used for underground nuclear weapons effects tests on the east side of Rainier and Aqueduct Mesas. Six nuclear weapons effects tests, Mint Leaf, Diamond Sculls, Husky Pup, Midas Myth/Milagro, Mighty Oak, and Mission Ghost, and one high explosive test, SPLAT, were conducted within the U12t Tunnel from 1970 to 1987. All six of the nuclear weapons effects tests and the high explosive test were sponsored by DTRA. Two conventional weapons experiments, Dipole Knight and Divine Eagle, were conducted in the tunnel portal area in 1997 and 1998. These experiments were sponsored by the Defense Special Weapons Agency. The U12t Tunnel complex is composed of the Portal and Mesa Areas and includes an underground tunnel with a main access drift and nine primary drifts, a substantial tailings pile fronting the tunnel portal, a series of discharge ponds downslope of the tailings pile, and two instrumentation trailer parks and 16 drill holes on top of Aqueduct Mesa. A total of 89 cultural features were recorded: 54 at the portal and 35 on the mesa. In the Portal Area, cultural features are mostly concrete pads and building foundations; other features include the portal, rail lines, the camel back, ventilation and cooling system components, communication equipment, and electrical equipment. On the mesa are drill holes, a few concrete pads, a loading ramp, and electrical equipment.

Harold Drollinger; Robert C. Jones; and Thomas F. Bullard; Desert Research Institute, Laurence J. Ashbaugh, Southern Nevada Courier Service and Wayne R. Griffin, Stoller-Navarro Joint Venture

2009-02-01

135

CHARACTERIZATION OF MERCURY CONTAMINATION AT THE EAST FORK POPLAR CREEK SITE, OAK RIDGE, TENNESSEE: A CASE STUDY  

EPA Science Inventory

Historic accidental release of mercury-contaminated material associated with nuclear weapons production at East Fork Poplar Creek (EFPC) resulted in stream and floodplain contamination. he EFPC is designated as an Oak Ridge Reservation (ORR) operable unit under the Comprehensive ...

136

Chemical composition and mass size distribution of PM1 at an elevated site in central east China  

NASA Astrophysics Data System (ADS)

Size-resolved aerosol chemical compositions were measured continuously for 1.5 years from June 2010 to January 2012 with an aerosol mass spectrometer (AMS) to characterize the mass and size distributions (MSDs) of major chemical components in submicron particles (approximately PM1) at Mountain Tai (Mt. Tai), an elevated site in central east China. The annual mean mass concentrations of organic, sulfate, nitrate, ammonium, and chloride were 11.2, 9.2, 7.2, 5.8, and 0.95 ?g m-3, respectively, which are much higher than those at most mountain sites in the USA and Europe, but lower than those at the nearby surface rural sites in China. A clear seasonality was observed for all major components throughout the study, with low concentration in fall and high in summer, and is believed to be caused by seasonal variations in planetary boundary layer (PBL) height, near surface pollutant concentrations and regional transport processes. Air masses were classified into categories impacted by PBL, lower free troposphere (LFT), new particle formation (NPF), in-cloud processes, and polluted aerosols. Organics dominated the PM1 mass during the NPF episodes, while sulfate contributed most to PM1 in cloud events. The average MSDs of particles between 30 and 1000 nm during the entire study for organics, sulfate, nitrate, and ammonium were approximately log-normal with mass median diameters (MMDs) of 539, 585, 542, and 545 nm, respectively. These values are slightly larger than those observed at ground sites within the North China Plain (NCP), likely due to the relative aged and well-mixed aerosol masses at Mt. Tai. There were no obvious differences in MMDs during the PBL, LFT, in-cloud and polluted episodes, but smaller MMDs, especially for organics, were observed during the NPF events. During the PBL, NPF, and polluted episodes, organics accounted for major proportions at smaller modes, and reached 70% at 100-200 nm particles in the polluted events. In cloud episodes, inorganics contributed 70% to the whole size range dominated by sulfate, which contributed 40% to small particles (100-200 nm), while organics occupied 20%, indicating that sulfate is a critical chemical component in cloud formation. Seven clusters of air masses were classified based on 72 h back-trajectory analysis. The majority of the regionally dispersed aerosols were found to be contributed from short distance mixed aerosols, mostly originated from the south with organics and sulfate as major components. Air masses from long range transport always brought clean and dry aerosols which resulted in low concentrations at Mt. Tai. AMS-PMF (positive matrix factorization) was employed to resolve the subtype of organics. Oxygenic organics aerosols (OAs) occupied 49, 56, 51, and 41% of OAs in the four seasons respectively, demonstrating that most OA were oxidized in summer due to strong photochemical reactions. Biomass burning OAs (BBOAs) accounted for 34% of OA in summer, mainly from field burning of agriculture residues, and coal combustion OAs (CCOAs) accounted for 22% of OA in winter from heating.

Zhang, Y. M.; Zhang, X. Y.; Sun, J. Y.; Hu, G. Y.; Shen, X. J.; Wang, Y. Q.; Wang, T. T.; Wang, D. Z.; Zhao, Y.

2014-11-01

137

Origin of elevated water levels encountered in Pahute Mesa emplacement boreholes: Preliminary investigations  

SciTech Connect

The presence of standing water well above the predicted water table in emplacement boreholes on Pahute Mesa has been a recurring phenomenon at the Nevada Test Site (NTS). If these levels represent naturally perched aquifers, they may indicate a radionuclide migration hazard. In any case, they can pose engineering problems in the performance of underground nuclear tests. The origin of these elevated waters is uncertain. Large volumes of water are introduced during emplacement drilling, providing ample source for artificially perched water, yet elevated water levels can remain constant for years, suggesting a natural origin instead. In an effort to address the issue of unexpected standing water in emplacement boreholes, three different sites were investigated in Area 19 on Pahute Mesa by Desert Research Institute (DRI) staff from 1990-93. These sites were U-19az, U-19ba, and U-19bh. As of this writing, U-19bh remains available for access; however, nuclear tests were conducted at the former two locations subsequent to this investigations. The experiments are discussed in chronological order. Taken together, the experiments indicate that standing water in Pahute Mesa emplacement holes originates from the drainage of small-volume naturally perched zones. In the final study, the fluids used during drilling of the bottom 100 m of emplacement borehole U-19bh were labeled with a chemical tracer. After hole completion, water level rose in the borehole, while tracer concentration decreased. In fact, total mass of tracer in the borehole remained constant, while water levels rose. After water levels stabilized in this hole, no change in tracer mass was observed over two years, indicating that no movement of water out of the borehole is taking place (as at U- 19ba). Continued labeling tests of standing water are recommended to confirm the conclusions made here, and to establish their validity throughout Pahute Mesa.

Brikowski, T.; Chapman, J.; Lyles, B.; Hokett, S.

1993-11-01

138

Relations between groundwater levels and anthropogenic and meteorological stressors at selected sites in east-central Florida, 1995-2007  

USGS Publications Warehouse

Multivariate linear regression analyses were used to define the relations of water levels in the Upper Floridan aquifer (UFA) and surficial aquifer system (SAS) to anthropogenic and meteorological stressors between 1995 and 2007 at two monitoring well sites (Charlotte Street and Lake Oliver) in east-central Florida. Anthropogenic stressors of interest included municipal and agricultural groundwater withdrawals, and application of reclaimed-water to rapid-infiltration basins (source of aquifer recharge). Meteorological stressors included precipitation and potential evapotranspiration. Overall, anthropogenic and meteorological stressors accounted for about 40 to 89 percent of the variance in UFA and SAS groundwater levels and water-level changes. While mean monthly water levels were better correlated with monthly stressor values, changes in UFA and SAS water levels were better correlated with changes in stressor values. Water levels and water-level changes were influenced by system persistence as the moving-averaged values of both stressor types, which accounted for the influence of the previous month(s) conditions, consistently yielded higher adjusted coefficients of determination (R2 adj) values than did single monthly values. While monthly water-level changes tend to be influenced equally with both stressors across the hydrologically averaged 13-year period, changes were more influenced by one stressor or the other seasonally and during extended wet and dry periods. Seasonally, UFA water-level changes tended to be more influenced by anthropogenic stressors than by meteorological stressors, while changes in SAS water levels tended to be more influenced by meteorological stressors. During extended dry periods (12 months or greater), changes in UFA water levels at Charlotte Street were more affected by anthropogenic stressors than by meteorological stressors, while changes in SAS levels were more affected by meteorological stressors. At Lake Oliver, changes in both UFA and SAS water levels were better correlated with meteorological stressors for all but the wet period between April 1995 and April 1996. Interestingly, changes in both UFA and SAS water levels at Charlotte Street were also better correlated with anthropogenic stressors during a similar wet period between April 1995 and June 1996 when substantive reductions in groundwater withdrawals resulted in appreciable recovery of both UFA and SAS water levels. The regional effects of anthropogenic stressors had limited influence on water-level changes at Charlotte Street and virtually no influence on changes at Lake Oliver. When regressed against the 2.2 Mgal/d (million gallons per day) of municipal withdrawals located within 2 miles of the Charlotte Street site, water-level changes were influenced solely by precipitation and potential evapotranspiration. At a radius of 2.5 miles, however, where cumulative withdrawals totaled about 9.5 Mgal/d, water-level changes were equally influenced by both anthropogenic and meteorological stressors. Withdrawals located at distances of greater than 3 miles from this site had no appreciable effect on relations between water-level changes and these stressors. At Lake Oliver, changes in UFA water levels were equally influenced by both stressors regardless of distance, while changes in SAS levels were more influenced by meteorological stressors at all distances.

Murray, Louis C., Jr.

2010-01-01

139

Detectors for dark photon search with MESA  

SciTech Connect

The predictions of the standard model for the anomalous magnetic momentum of the muon, deviates from the direct measurements by 3,6 ?. A gauge boson of a new U(1)-Interaction, the so called dark photon, is predicted in many expansions of the standard model and could explain those deviations. In order to search for such a dark photon, a dedicated experiment is scheduled at the planned low energy accelerator MESA in Mainz. In order to detect dark photons this experiment needs a high resolution detector with a suitable acceptance.

Molitor, Matthias [Johannes-Gutenberg University Mainz (Germany)

2013-11-07

140

Reliability of direct mesa flip-chip bonded VCSELs  

Microsoft Academic Search

We have demonstrated flip chip bonded vertical cavity surface emitting lasers (VCSELs) that have been bonded directly to the mesa. We have seen that flip chip bonding to the mesa has given lowered thermal impedance compared to side flip-chip and die bonded VCSELs. An array of devices has been run for 1600 hours without failure.

M. Teitelbaum; K. W. Goossen

2004-01-01

141

Survey of Critical Wetlands and Riparian Areas in Mesa County  

E-print Network

Survey of Critical Wetlands and Riparian Areas in Mesa County Colorado Natural Heritage Program, Colorado 80523 #12;Survey of Critical Wetlands and Riparian Areas in Mesa County Prepared for: Colorado to the landowners who gave us permission to survey their property. We enjoyed meeting them, and in some cases hiking

142

How To Start a MESA Center at a Community College.  

ERIC Educational Resources Information Center

Between September 1990 and December 1991, Cabrillo College implemented the Math, Engineering, and Science Achievement (MESA) program to increase the number of underrepresented minority students enrolling in scientific disciplines at Cabrillo and subsequently transferring to four-year colleges. The initial program was targeted to 200 MESA members…

Claire, Susan

143

Mathematics, Engineering, Science Achievement Program PG&E / MESA Scholarship  

E-print Network

? · To what extent has your involvement with MESA helped you to better define your academic or personal goals of academic opportunities. The scholarships of $500- $1500 will be awarded to Sonoma State MESA students who demonstrate academic merit, financial need, and outstanding leadership in the engineering and science

Ravikumar, B.

144

Overview of the Grand Junction Office from Bluff east of ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Overview of the Grand Junction Office from Bluff east of facility. Note Buildings #35. #33 and #31A in lower left of photograph. VIEW WEST - Department of Energy, Grand Junction Office, 2597 B3/4 Road, Grand Junction, Mesa County, CO

145

The Laramide Mesa formation and the Ojo de Agua caldera, southeast of the Cananea copper mining district, Sonora, Mexico  

USGS Publications Warehouse

The Mesa Formation extends from Cananea, Mexico, southeast to the Sonora River and is the main host rock of Laramide porphyry copper deposits in the Cananea District and at the Alacran porphyry prospect to the east. The Mesa consists of two members-a lower andesite and an upper dacite. The lowest part of the dacite member is a crystal tuff about 100 m thick. This tuff is the outfall of a caldera centered near the village of Ojo de Agua, dated by 40Ar/39Ar at 65.8 Ma ?0.4. The Ojo de Agua Caldera is about 9 km in diameter and is filled by a light gray biotite dacite tuff with abundant flattened pumice fragments. The volume of the caldera is estimated to be 24 km3.

Cox, Dennis P.; Miller, Robert J.; Woodbourne, Keith L.

2006-01-01

146

Feasibility Study of Biopower in East Helena, Montana. A Study Prepared in Partnership with the Environmental Protection Agency for the RE-Powering America's Land Initiative: Siting Renewable Energy on Potentially Contaminated Land and Mine Sites  

SciTech Connect

The U.S. Environmental Protection Agency (EPA) developed the RE-Powering America's Land initiative to reuse contaminated sites for renewable energy generation when aligned with the community's vision for the site. The former American Smelting and Refining Company (Asarco) smelter in East Helena, Montana, was selected for a feasibility study under the initiative. Biomass was chosen as the renewable energy resource based on the wood products industry in the area. Biopower was selected as the technology based on Montana's renewable portfolio standard (RPS) requiring utilities to purchase renewable power.

Moriarty, K.

2013-02-01

147

Completion Report for Well ER-12-4, Corrective Action Unit 99: Rainier Mesa - Shoshone Mountain (includes Errata Sheet)  

SciTech Connect

Well ER-12-4 was drilled for the U.S. Department of Energy, National Nuclear Security Administration Nevada Site Office, in support of the Nevada Environmental Restoration Project at the Nevada Test Site, Nye County, Nevada. This well was drilled in May 2005, as part of a hydrogeologic investigation program for the Rainier Mesa-Shoshone Mountain Corrective Action Unit in the north-central portion of the Nevada Test Site. The well is located on Rainier/Aqueduct Mesa, northwest of Yucca Flat, within Area 12 of the Nevada Test Site. The well provided information regarding the radiological and physical environment near underground nuclear tests conducted in U12t Tunnel, information on the pre-Tertiary rocks in the area, and depth to the regional water table.

U.S. Department of Energy, National Nuclear Security Administration Nevada Site Office; Bechtel Nevada

2006-05-01

148

Mesa Top Photovoltaic Array SyStem SpecificationS  

E-print Network

Mesa Top Photovoltaic Array SyStem SpecificationS System size: 750 kW (DC, estimated) Characteristics: Single axis tracker photovoltaics, ground mounted Annual output: 1,200 MWh Location: Top of South

149

Paleocene Sepultura Formation: submarine canyon at La Mesa, Baja California, Mexico  

SciTech Connect

The Paleocene Sepultura Formation has been interpreted as the result of both deposition in a basin that varied in depth from strandline to at least 30-40 fathoms, and to widely distributed fluvial deposition. At La Mesa, east of Puerto Santa Catarina, Baja California, an excellent exposure exhibits canyon-fed sediments not reported in other places for this formation. The sediments at La Mesa consist of a sequence of alternating clastics and resedimented carbonate materials. The sequence begins with fine sandstone cut by channels, which indicates gravity-induced catastrophic sedimentation, such as debris flows. The channels are filled with massive nodular algal limestone with rip-up clasts of sandstone, some of them 1 m wide, with abundant Turritella pachecoensis and Venericardia sp. The massive limestone is overlain by clastic sediments that, in places, exhibit slumping and laminar bedding with limestone rip-ups. Apparently this unit is an upper-fan deposit. The nodular limestone grades laterally into thin-bedded calcarenites. These allodapic limestones exhibit A and B divisions of the Bouma sequence, similar to overbank levee deposits.

Tellez-Duarte, M.A.; Navarro-Fuentes, J.C.; Valdez-Noriega, M.A.

1988-03-01

150

Genesis and continuity of quaternary sand and gravel in glacigenic sediment at a proposed low-level radioactive waste disposal site in east-central Illinois  

USGS Publications Warehouse

The Illinois Department of Nuclear Safety has characterized the Martinsville Alternative Site (MAS) for a proposed low-level radioactive waste disposal facility. The MAS is located in east-central Illinois approximately 1.6 km (1 mi) north of the city of Martinsville. Geologic investigation of the 5.5-km2 (1380-acre) site revealed a sequence of chiefly Illinoian glacigenic sediments from 6 to 60 m (20-200 ft) thick overlying two major bedrock valleys carved in Pennsylvanian strata. Relatively permeable buried units include basal, preglacial alluvium; a complex of intraglacial and subglacial sediment; englacial deposits; and supraglacial fluvial deposits. Postglacial alluvium underlies stream valleys on and adjacent to the site. In most areas, the buried sand units are confined by low-permeability till, lacustrine sediment, colluvium, and loess. The distribution and thickness of the most extensive and continuous buried sand units have been modified considerably by subglacial erosion, and their distributions have been influenced by the buried bedrock valleys. The most continuous of the various sand units were deposited as preglacial and postglacial alluvium and are the uppermost and lowermost stratigraphic units at the alternative site. Sand units that were deposited in englacial or ice-marginal environments are less continuous. Aquifer pumping tests, potentiometric head data, and groundwater geochemistry analyses indicate minimal interaction of groundwater across localized interconnections of the permeable units. ?? 1991 Springer-Verlag New York Inc.

Troost, K.G.; Curry, B.B.

1991-01-01

151

Varying depositional environments across the Oligocene-Miocene boundary and their relevance for East Antarctic ice sheet history: IODP Site U1356, Wilkes Land margin  

NASA Astrophysics Data System (ADS)

IODP Expedition 318 drilled seven sites in two transects across the Wilkes Land (WL) margin of Antarctica. The objective was to obtain a long-term record of the Cenozoic Antarctic glaciation in response to climatic changes, including major transitions. Our work focuses on the study of nearly 300 meters of Oligocene-early Miocene sediments from Site 1356 (cores 42R to 72R) located on a channel levee in the lower continental rise. Shipboard core descriptions reported these sediments to consist of strongly bioturbated claystone and calcareous claystone with Zoophycos or Nereites ichnofacies. Subordinate lithofacies include: 1) laminated silty claystones, 2) convoluted claystones, sandstones and conglomerates; 3) mudstones and sandstones, with a few dispersed to common clasts; and 4) graded or cross-laminated siltstones and sandstones. Based on our study of facies associations in the cores, we differentiate 3 major sedimentary phases, representing important changes in the depositional environments off the WL margin. During the early-late Oligocene, sediments record deposition in a deep-water setting, with bottom currents reworking hemipelagic sediments. Late Oligocene sedimentary processes are dominated by successive fine- to coarse-grained debris-flow mass transport deposits. In the early Miocene, turbidites and hemipelagic sedimentation, characteristic of levee deposition, dominate. With this interpretation of sedimentary environments, plus the correlation between Site U1356 and seismic reflection profiles at the site and vicinity, we can begin to link the relation between along-slope and down-slope processes to the evolution of the East Antarctic Ice Sheet.

Salabarnada, Ariadna; Escutia, Carlota; Nelson, Hans; Damuth, John E.; Brinkhuis, Henk

2014-05-01

152

National Wind Technology Center Site Environmental Assessment: Bird and Bat Use and Fatalities -- Final Report; Period of Performance: April 23, 2001 -- December 31, 2002  

SciTech Connect

This study was conducted to ascertain actual and potential impacts of wind turbines on populations of birds and bats at the National Wind Technology Center (NWTC) in northern Jefferson County, Colorado. The NWTC, which is part of the U.S. Department of Energy's National Renewable Energy Laboratory (NREL), is located on a mesa dominated by ungrazed grassland with isolated patches of ponderosa pine. Similar lands to the north and west are part of the city of Boulders open space system. Areas to the east and south are part of the Rocky Flats Environmental Technology Site.

Schmidt, E.; Piaggio, A. J.; Bock, C. E.; Armstrong, D. M.

2003-01-01

153

MESA: Mercator scheduler and archive system  

NASA Astrophysics Data System (ADS)

We have developed an observing scheduling and archive system for the 1.2 meter Mercator Telescope. The goal was to optimize the specific niche of this modern small telescope in observational astrophysics: the building-up of long-term time series of photometric or high-resolution spectroscopic data with appropriate sampling for any given scientific program. This system allows PIs to easily submit their technical requirements and keep track of the progress of the observing programmes. The scheduling system provides the observer with an optimal schedule for the night which takes into account the current observing conditions as well as the priorities and requirements of the programmes in the queue. The observer can conveniently plan an observing night but also quickly adapt it to changing conditions. The archiving system automatically processes new files as they are created, including reduced data. It extracts the metadata and performs the normalization. A user can query, inspect and retrieve observing data. The progress of individual programmes, including timeline and reduced data plots can be seen at any time. Our MESA project is based on free and open source software (FOSS) using the Python programming language. The system is fully integrated with the Mercator Observing Control System1 (MOCS).

Merges, Florian; Prins, Saskia; Pessemier, Wim; Raskin, Gert; Perez Padilla, Jesus; Van Winckel, Hans; Aerts, Conny

2012-09-01

154

Fiscal year 1996 decontamination and decommissioning activities photobriefing book for the Argonne National Laboratory-East Site, Technology Development Division, Waste Management Program, Decontamination and Decommissioning Projects Department  

SciTech Connect

The Photobriefing Book describes the Decontamination and Decommissioning (D and D) Program at the Argonne National Laboratory-East Site (ANL-E) near Lemont, Illinois. This book summarizes current D and D projects, reviews fiscal year (FY) 1996 accomplishments, and outlines FY 1997 goals. A section on D and D Technology Development provides insight on new technologies for D and D developed or demonstrated at ANL-E. Past projects are recapped and upcoming projects are described as Argonne works to accomplish its commitment to, ``Close the Circle on the Splitting of the Atom.`` Finally, a comprehensive review of the status and goals of the D and D Program is provided to give a snap-shot view of the program and the direction it`s taking as it moves into FY 1997. The D and D projects completed to date include: Plutonium Fuel Fabrication Facility; East Area Surplus Facilities; Experimental Boiling Water Reactor; M-Wing Hot Cell Facilities; Plutonium Gloveboxes; and Fast Neutron Generator.

NONE

1996-12-31

155

Effect of Forest Site Preparation and Livestock Grazing on Stormflow and Water Quality in the South East  

E-print Network

of Texas. However, little is known about the influence of intensive forest practices or livestock grazing on water quality, yield or site productivity in Texas. This is the only instrumented watershed study in Texas or Louisiana that is currently evaluating...

Hunter, T. K.; Blackburn, W. H.; Weichert, A. T.; Dobrowolski, J. P.

156

Assessment of Stormflow and Water Quality from Undisturbed and Site Prepared Forest Land in East Texas (Final Report)  

E-print Network

by shearing and windrowing, 2) clearcutting - followed by roller chopping and 3) undisturbed control. Following treatment, the sheared and windrowed sites exposed 57% of the surface soil compared to 16% for the chopped watersheds. During 1981, the first year...

DeHaven, M. G.; Blackburn, W. H.; Nieber, J. L.; Crawley, W. W.; Weichert, A. T.

157

Comparison of mosquito control programs in seven urban sites in Africa, the Middle East, and the Americas  

PubMed Central

Mosquito control programs at seven urban sites in Kenya, Egypt, Israel, Costa Rica, and Trinidad are described and compared. Site-specific urban and disease characteristics, organizational diagrams, and strengths, weaknesses, obstacles and threats (SWOT) analysis tools are used to provide a descriptive assessment of each mosquito control program, and provide a comparison of the factors affecting mosquito abatement. The information for SWOT analysis is collected from surveys, focus group discussions, and personal communication. SWOT analysis identified various issues affecting the efficiency and sustainability of mosquito control operations. The main outcome of our work was the description and comparison of mosquito control operations within the context of each study site’s biological, social, political, management, and economic conditions. The issues identified in this study ranged from lack of inter-sector collaboration to operational issues of mosquito control efforts. A lack of sustainable funding for mosquito control was a common problem for most sites. Many unique problems were also identified, which included lack of mosquito surveillance, lack of law enforcement, and negative consequences of human behavior. Identifying common virtues and shortcomings of mosquito control operations is useful in identifying “best practices” for mosquito control operations, thus leading to better control of mosquito biting and mosquito-borne disease transmission. PMID:17316882

Impoinvil, Daniel E.; Ahmad, Sajjad; Troyo, Adriana; Keating, Joseph; Githeko, Andrew K.; Mbogo, Charles M; Kibe, Lydiah; Githure, John I.; Gad, Adel M.; Hassan, Ali N.; Orshan, Laor; Warburg, Alon; Calderón-Arguedas, Olger; Sánchez-Loría, Victoria M.; Velit-Suarez, Rosanna; Chadee, Dave D.; Novak, Robert J.; Beier, John C.

2007-01-01

158

Upper Crustal Structure above Off-axis Magma Lenses at RIDGE-2000 East Pacific Rise Integrated Study Site from 3D Multichannel Seismic Reflection Data  

NASA Astrophysics Data System (ADS)

The 2008 multi-streamer 3D seismic reflection experiment conducted aboard the R/V Marcus Langseth at the RIDGE-2000 East Pacific Rise Integrated Study Site reveals prominent near-axis crustal reflectors on both the east and west flanks of the ridge crest which are interpreted as off-axis melt lenses (OAML) injected at mid-crustal levels. These OAML are probable sites of off-axis volcanism and provide potential heat sources for localized hydrothermal circulation on the ridge flanks, which we speculate may affect off-axis upper crustal structure. To investigate the effect of OAML on the upper crustal structure, we choose two across-axis lines above a prominent OAML on the east flank of the ridge that is present in the southernmost part of our study area: Line 1428P across the middle part of the OAML near 9° 38’N and Line 1476P across the northern end of this OAML near 9° 39’N. Initial analysis includes 2D processing to produce seismic reflection images for each line and 1D travel time modeling on CMP super gathers to characterize Layer 2A and upper Layer 2B velocity structure. Comparison of seismic reflection images and upper crustal velocity structure for the two lines shows a decrease in Layer 2A thickness by 150m and a decrease in the uppermost 2B velocity by 10-20% above the central portion of OAML. We attribute these local anomalies to alteration associated with off-axis hydrothermal circulation driven by the OAML where enhanced precipitation of alteration minerals may seal porosity within lowermost Layer 2A, converting it to lower velocity uppermost Layer 2B. To further constrain the velocity structure of Layer 2A and Layer 2B, we conduct 2D P-wave tomography with downward continued shot gathers along the studied lines (Harding et al, 2007). The downward continued shot gathers simulate seismic sources and receivers located near the seafloor, and therefore provide travel time information from near-offset refractions that are normally obscured by the seafloor reflection. Layer 2A and 2B arrivals from the downward continued shot gathers are picked and a regularized non-linear inversion is conducted with FAST software (Zelt & Barton, 1998). We present the tomography results as well as associated 3D seismic reflection images that encompass the OAML. With this analysis we aim to better constrain the spatial extent of altered upper crust associated with the OAML. The results have implications for the processes of the crustal formation and off-axis hydrothermal activity on fast-spreading mid-ocean ridges.

Han, S.; Carbotte, S. M.; Carton, H. D.; Newman, K. R.; Canales, J.; Nedimovic, M. R.

2010-12-01

159

Preliminary numerical modeling for the G-Tunnel welded tuff mining experiment; Yucca Mountain site characterization project  

Microsoft Academic Search

Yucca Mountain, located in Southern Nevada, is to be considered as a potential site for a nuclear waste repository. Located in Rainier Mesa on the Nevada Test Site, G-Tunnel has been the site of a series of experiments, part of whose purpose is to evaluate measurement techniques for rock mechanics before testing in the Exploratory Shaft. Rainier Mesa is composed

R. L. Johnson; S. J. Bauer

1991-01-01

160

Food Habits of the Northern Spotted Owl (Strix occidentalis caurina) at Six Nest Sites in Washington's East Cascades  

Microsoft Academic Search

This paper reports on 245 pellet samples containing 479 identified prey items collected at six Northern Spotted Owl (Strix occidentalis caurina) breeding sites in the eastern portion of its range. The majority of prey (biomass) came from four species; northern flying squirrels (Glaucomys sabrinus), bushy-tailed woodrats (Neotoma cinerea), northern pocket gopher (Thomomys talpoides), and pika (Ochotona princeps). Flying squirrels were

Kenneth R. Bevis; Jo Ellen Richards; Gina M. King; Eric E. Hanson

161

Long-range transport of particulate polycyclic aromatic hydrocarbons at Cape Hedo remote island site in the East China Sea between 2005 and 2008  

E-print Network

BeP Reference East China Sea Okinawa, Japan Okinawa, JapanJapan (1,800 km from Beijing) in the East China Sea (Fig.Japan- Korea-Russia (JKR) and the Pa- cific Ocean (PO)] Beijing JKR Jeju China CH The East China Sea

2008-01-01

162

Assessing the water quality response to an alternative sewage disposal strategy at bathing sites on the east coast of Ireland.  

PubMed

A three-dimensional model is used to assess the bathing water quality of Bray and Killiney bathing sites in Ireland following changes to the sewage management system. The model, firstly calibrated to hydrodynamic and water quality data from the period prior to the upgrade of the Wastewater Treatment Works (WwTW), was then used to simulate Escherichia coli (E. coli) distributions for discharge scenarios of the periods prior to and following the upgrade of the WwTW under dry and wet weather conditions. E. coli distributions under dry weather conditions demonstrate that the upgrade in the WwTW has remarkably improved the bathing water quality to a Blue Flag status. The new discharge strategy is expected to drastically reduce the rainfall-related incidents in which environmental limits of the Bathing Water Directive are breached. However, exceedances to these limits may still occur under wet weather conditions at Bray bathing site due to storm overflows that may still be discharged through two sea outfalls offshore of Bray bathing site. PMID:25577474

Bedri, Zeinab; O'Sullivan, John J; Deering, Louise A; Demeter, Katalin; Masterson, Bartholomew; Meijer, Wim G; O'Hare, Gregory

2015-02-15

163

Deep Sea Drilling Project Site 612 bolide event: New evidence of a late Eocene impact-wave deposit and a possible impact site, U. S. east coast  

SciTech Connect

A remarkable >60-m-thick, upward-fining, polymictic, marine boulder bed is distributed over >15,000 km[sup 2] beneath Chesapeake Bay and the surrounding Middle Atlantic Coastal Plain and inner continental shelf. The wide varieties of clast lithologies and microfossil assemblages were derived from at least seven known Cretaceous, Paleocene, and Eocene stratigraphic units. The supporting pebbly matrix contains variably mixed assemblages of microfossils from the same seven stratigraphic units, along with trace quantities of impact ejecta (tektite glass and shocked quartz). The youngest microfossils in the boulder bed are of early-late Eocene age. On the basis of its unusual characteristics and its stratigraphic equivalence to a layer of impact ejecta at Deep Sea Drilling Project (DSDP) Site 612 (New Jersey continental slope), the authors postulate that this boulder bed was formed by a powerful bolide-generated wave train that scoured the ancient inner shelf and coastal plain of southeastern Virginia. The most promising candidate for the bolide impact site (identified on seismic reflection profiles) is 40 km north-northwest of DSDP Site 612 on the New Jersey outer continental shelf.

Poag, C.W.; Poppe, L.J.; Folger, D.W. (Geological Survey, Woods Hole, MA (United States)); Powars, D.S.; Mixon, R.B.; Edwards, L.E. (Geological Survey, Reston, VA (United States)); Bruce, S. (State Water Control Board, Richmond, VA (United States))

1992-09-01

164

Temporal trajectories of wet deposition across hydro-climatic regimes: Role of urbanization and regulations at U.S. and East Asia sites  

NASA Astrophysics Data System (ADS)

Dominant global patterns of urbanization and industrialization contribute to large-scale modification of the drivers for hydrologic and biogeochemical processes, as evident in Asia, Africa, and South America which are experiencing rapid population and economic growth. One manifestation of urbanization and economic development is decreases in air quality, increases in dry/wet deposition fluxes, and growing adverse impacts on public health and ecosystem integrity. We examined available long-term (1980-2010) observational data, gathered at weekly intervals, for wet deposition at 19 urban sites in the U.S., and monitoring data (2000-2009) available for 17 urban sites at a monthly scale in East Asia. Our analyses are based on data for four constituents (SO42-, NO3-, Ca2+, and Mg2+); differences in atmospheric chemistry and terrestrial sources of these constituents enabled a robust comparative analysis. We examined intra-annual variability and the long-term temporal trajectories of wet deposition fluxes to discern the relative role of anthropogenic and stochastic hydro-climatic forcing. Here, we show that: (1) temporal variability in wet deposition fluxes follows an exponential probability density function at all sites, evidence that stochasticity of rainfall is the dominant control of wet deposition variability; (2) the mean wet deposition flux, ?? (ML-2T-1), has decreased in the U.S. over time since enactment of the Clean Air Act, with ?? having become homogenized across varying hydro-climatic regimes; and (3) in contrast, ?? values for East Asian cities are 3-10 times higher than U.S. cities, attributed to lax regulatory enforcement. Based on the observed patterns, we suggest a stochastic model that generates ellipses within which the ?? temporal trajectories are inscribed. In the U.S., anthropogenic forcing (regulations) is dominant in the humid regions, while variability in hydro-climatic forcing explains inter-annual variability in arid regions. Our stochastic analysis facilitates projections of the temporal trajectory shifts in wet deposition fluxes as a result of urbanization and other land-use changes, climate change, and regulatory enforcement.

Park, Jeryang; Gall, Heather E.; Niyogi, Dev; Rao, P. Suresh C.

2013-05-01

165

A synthesis of the "Ecological Effects of Reservoir Operations at Blue Mesa Reservoir" Project  

E-print Network

A synthesis of the "Ecological Effects of Reservoir Operations at Blue Mesa Reservoir" Project RESERVOIR AND FOOD WEB DYNAMICS AT BLUE MESA RESERVOIR, COLORADO, 1993-2002 U.S. Department of the Interior June 2005 #12;2 RECLAMATION A synthesis of the "Ecological Effects of Reservoir Operations at Blue Mesa

166

78 FR 34554 - Establishment of Class E Airspace; Blue Mesa, CO  

Federal Register 2010, 2011, 2012, 2013

...13-ANM-9] Establishment of Class E Airspace; Blue Mesa, CO AGENCY: Federal Aviation Administration...action establishes Class E airspace at Blue Mesa VHF Omni-Directional Radio Range/Distance Measuring Equipment (VOR/DME), Blue Mesa, CO, to facilitate vectoring...

2013-06-10

167

78 FR 18268 - Proposed Establishment of Class E Airspace; Blue Mesa, CO  

Federal Register 2010, 2011, 2012, 2013

...Proposed Establishment of Class E Airspace; Blue Mesa, CO AGENCY: Federal Aviation Administration...proposes to establish Class E airspace at the Blue Mesa VHF Omni-Directional Radio Range/Distance Measuring Equipment (VOR/DME), Blue Mesa, CO to facilitate vectoring of...

2013-03-26

168

Geometry of the Trachyte Mesa intrusion, Henry Mountains, Utah: Implications for the emplacement of small melt  

E-print Network

Geometry of the Trachyte Mesa intrusion, Henry Mountains, Utah: Implications for the emplacement, Florida 33620, USA [1] The Trachyte Mesa intrusion is one of several small satellite bodies to the larger that Trachyte Mesa is blister shaped and intruded into flat and gently NW dipping strata. In this study we

Wetmore, Paul H.

169

2007 GSA Annual meeting in Denver, CO GEOMETRY OF THE TRACHYTE MESA INTRUSION, HENRY  

E-print Network

2007 GSA Annual meeting in Denver, CO GEOMETRY OF THE TRACHYTE MESA INTRUSION, HENRY MOUNTAINS of Southern California, Los Angeles, CA 89009 The Trachyte Mesa intrusion is one of several small satellite.B. Hunt identified Trachyte Mesa as a laccolith, a lens-shaped intrusion with a domed roof. Recent studies

Wetmore, Paul H.

170

Aegean Dendrochronology Project December 2002 Progress Report This year we have a mini-sensation of sorts to report in the site of Poggiomarino, about 18 kms east of  

E-print Network

-sensation of sorts to report in the site of Poggiomarino, about 18 kms east of Mt. Vesuvius on the south bank below the A.D. 79 Vesuvius eruption debris. #12;2 In a change from our usual format we enclose reduced

Manning, Sturt

171

Enhanced concentrations of citric acid in spring aerosols collected at the Gosan background site in East Asia  

NASA Astrophysics Data System (ADS)

In order to investigate water-soluble dicarboxylic acids and related compounds in the aerosol samples under the Asian continent outflow, total suspended particle (TSP) samples ( n = 32) were collected at the Gosan site in Jeju Island over 2-5 days integration during 23 March-1 June 2007 and 16-24 April 2008. The samples were analyzed for water-soluble dicarboxylic acids, ketocarboxylic acids, and ?-dicarbonyls using a capillary gas chromatography technique. We found elevated concentrations of atmospheric citric acid (range: 20-320 ng m -3) in the TSP samples during mid- to late April of 2007 and 2008. To specify the sources of citric acid, dicarboxylic acids and related compounds were measured in the pollen sample collected at the Gosan site (Pollen_Gosan), authentic pollen samples from Japanese cedar ( Cryptomeria) (Pollen_cedar) and Japanese cypress ( Chamaecyparis obtusa) (Pollen_cypress), and tangerine fruit produced from Jeju Island. Citric acid (2790 ng in unit mg of pollen mass) was found as most abundant species in the Pollen_Gosan, followed by oxalic acid (2390 ng mg -1). Although citric acid was not detected in the Pollen_cedar and Pollen_cypress as major species, it was found as a dominant species in the tangerine juice while malic acid was detected as major species in the tangerine peel, followed by oxalic and citric acids. Since Japanese cedar trees are planted around tangerine farms to prevent strong winds from the Pacific Ocean, citric acid that may be directly emitted from tangerine is likely adsorbed on pollens emitted from Japanese cedar and then transported to the Gosan site. Much lower malic/citric acid ratios obtained under cloudy condition than clear condition suggest that malic acid may rapidly decompose to lower molecular weight compounds such as oxalic and malonic acids (

Jung, Jinsang; Kawamura, Kimitaka

2011-09-01

172

East Tennessee Technology Park 3-1 3. East Tennessee Technology Park  

E-print Network

East Tennessee Technology Park 3-1 3. East Tennessee Technology Park The ETTP was originally built to environmental management and restoration operations, and the name was changed to the East Tennessee Technology, the K-25 Site was named the "East Tennessee Technology Park" to reflect its new mission

Pennycook, Steve

173

East Tennessee Technology Park 3-1 3. East Tennessee Technology Park  

E-print Network

East Tennessee Technology Park 3-1 3. East Tennessee Technology Park ETTP was originally built to the East Tennessee Technology Park. Environmental management and remediation operations consist, the K-25 Site was renamed the "East Tennessee Technology Park" to reflect its new mission. Figure 3

Pennycook, Steve

174

East Tennessee Technology Park 3-1 3. East Tennessee Technology Park  

E-print Network

East Tennessee Technology Park 3-1 3. East Tennessee Technology Park The East Tennessee Technology was changed to the East Tennessee Technology Park. Environmental management and remediation operations consist Tennessee Technology Park (ETTP), originally known as the K-25 site, began in 1943 as part of the World War

Pennycook, Steve

175

East Tennessee Technology Park 3-1 3. East Tennessee Technology Park  

E-print Network

1 East Tennessee Technology Park 3-1 3. East Tennessee Technology Park ETTP was originally built to the "East Tennessee Technology Park." Environmental management and remediation operations consist the start of D&D activities. In 1997, the K-25 Site was renamed the "East Tennessee Technology Park

Pennycook, Steve

176

1 Greet the metal turtles at the Mesa Public Library.  

E-print Network

d 1 Greet the metal turtles at the Mesa Public Library. 2 Take a tour of public art. 3 Start from stranger. 41 Feed a worm to Elf the Turtle or pet Foxxy the Hognose snake at PEEC. 42 Dream about the cars

177

Experience with processes and monitors in Mesa (Summary)  

Microsoft Academic Search

In early 1977 we began to design the concurrent programming facilities of Pilot, a new operating system for a personal computer [5]. Pilot is a fairly large program itself (25,000 lines of Mesa code). In addition, it supports some large applications, ranging from data base management to internetwork message transmission, which are heavy users of concurrency (our experience with some

Butler W. Lampson; David D. Redell

1979-01-01

178

M.A.P.S.: Mesa Action Planning System.  

ERIC Educational Resources Information Center

This report describes implementation of a districtwide planning model in the Mesa, Arizona, Public Schools. Figures illustrate planning processes throughout the report. Intended as an implementive framework, the planning system's purposes are to assist decision making about resource allocation, program direction, progress measurement, and district…

Larson, Elizabeth J. Hunt

179

Reducing Anchor Loss in MEMS Resonators Using Mesa Isolation  

Microsoft Academic Search

In microelectromechanical systems resonators, dissipation of energy through anchor points into the substrate adds to resonator energy loss, contributing to low values of Q. A design for improving Q based on the reflection of anchor-generated surface acoustic waves is presented here. In this design, the resonator is surrounded by a trench, or a mesa, that partially reflects the wave energy

Manoj Pandey; Robert B. Reichenbach; Alan T. Zehnder; Amit Lal; Harold G. Craighead

2009-01-01

180

A Very High Order, Adaptable MESA Implementation for Aeroacoustic Computations  

NASA Technical Reports Server (NTRS)

Since computational efficiency and wave resolution scale with accuracy, the ideal would be infinitely high accuracy for problems with widely varying wavelength scales. Currently, many of the computational aeroacoustics methods are limited to 4th order accurate Runge-Kutta methods in time which limits their resolution and efficiency. However, a new procedure for implementing the Modified Expansion Solution Approximation (MESA) schemes, based upon Hermitian divided differences, is presented which extends the effective accuracy of the MESA schemes to 57th order in space and time when using 128 bit floating point precision. This new approach has the advantages of reducing round-off error, being easy to program. and is more computationally efficient when compared to previous approaches. Its accuracy is limited only by the floating point hardware. The advantages of this new approach are demonstrated by solving the linearized Euler equations in an open bi-periodic domain. A 500th order MESA scheme can now be created in seconds, making these schemes ideally suited for the next generation of high performance 256-bit (double quadruple) or higher precision computers. This ease of creation makes it possible to adapt the algorithm to the mesh in time instead of its converse: this is ideal for resolving varying wavelength scales which occur in noise generation simulations. And finally, the sources of round-off error which effect the very high order methods are examined and remedies provided that effectively increase the accuracy of the MESA schemes while using current computer technology.

Dydson, Roger W.; Goodrich, John W.

2000-01-01

181

Black Mesa Community School: Ten Years Later. A Progress Report.  

ERIC Educational Resources Information Center

The Black Mesa Community School, serving elementary school children in an isolated district of the Arizona Navajo reservation, represents the first step in Indian self-determination for area Navajos. The school is the result of community efforts begun in 1972 with a petition to operate a full-time school program for grades K-4 at Kitsilee.…

Black Mesa Community School Board, Inc., Chinle, AZ.

182

40Ar 39Ar age constraints on neogene sedimentary beds, Upper Ramparts, half-way Pillar and Canyon village sites, Porcupine river, east-central Alaska  

USGS Publications Warehouse

40Ar 39Ar ages of volcanic rocks are used to provide numerical constraints on the age of middle and upper Miocene sedimentary strata collected along the Porcupine River. Intercalated sedimentary rocks north of latitude 67??10???N in the Porcupine terrane of east-central Alaska contain a rich record of plant fossils. The fossils are valuable indicators of this interior region's paleoclimate during the time of their deposition. Integration of the 40Ar 39Ar results with paleomagnetic and sedimentological data allows for refinements in estimating the timing of deposition and duration of selected sedimentary intervals. 40Ar 39Ar plateau age spectra, from whole rock basalt samples, collected along the Upper Ramparts and near Half-way Pillar on the Porcupine River, range from 15.7 ?? 0.1 Ma at site 90-6 to 14.4 ?? 0.1 Ma at site 90-2. With exception of the youngest basalt flow at site 90-2, all of the samples are of reversed magnetic polarity, and all 40Ar 39Ar age spectrum results are consistent with the deposition of the entire stratigraphic section during a single interval of reversed magnetic polarity. The youngest flow at site 90-2 was emplaced during an interval of normal polarity. With age, paleomagnetic and sedimentological data, the ages of the Middle Miocene sedimentary rocks between the basalt flows at sites 90-1 and 90-2 can be assigned to an interval within the limits of analytical precision of 15.2 ?? 0.1 Ma; thus, the sediments were deposited during the peak of the Middle Miocene thermal maximum. Sediments in the upper parts of sites 90-1 and 90-2 were probably deposited during cooling from the Middle Miocene thermal maximum. 40Ar 39Ar results of plagioclase and biotite from a single tephra, collected at sites 90-7 and 90-8 along the Canyon Village section of the Porcupine River, indicate an age of 6.57 ?? 0.02 Ma for its time of eruption and deposition. These results, together with sedimentological and paleomagnetic data, suggest that all of the Upper Miocene lacustrine sedimentary rocks at these sites were deposited during a single interval of reversed magnetic polarity and may represent a duration of only about 40,000 years. The age of this tephra corresponds with a late late Miocene warm climatic interval. The results from the Upper Ramparts and Half-way Pillar sites are used to estimate a minimum interval of continental flood basalt activity of 1.1-1.5 million years, and to set limits for the timing and duration of Tertiary extensional tectonic activity in the Porcupine terrane. Our data indicate that the oroclinal flexure that formed before the deposition of the basalts at the eastern end of the Brooks Range was created prior to 15.7 ?? 0.1 Ma. ?? 1994.

Kunk, M.J.; Rieck, H.; Fouch, T.D.; Carter, L.D.

1994-01-01

183

Preliminary stratigraphic and hydrostratigraphic correlation of four deep coreholes east of the Savannah River Site in Allendale, Barnwell, and Aiken Counties, South Carolina  

SciTech Connect

Preliminary paleontologic, lithologic, and geophysical data from four deep coreholes east of the Savannah River Site in Allendale, Barnwell and Aiken Counties in South Carolina indicate the presence of four Upper Cretaceous formations and seven Tertiary formations in a dip-oriented geologic section. Hydrologic and lithologic data have been used to delineate three aquifer systems along the same section. The Cretaceous units are composed mainly of sand and clay with minor amounts of carbonates. The lowermost unit is correlative with the Cape Fear Formation. The upper three Cretaceous units are correlative with the Lumbee Group (Middendorf, Black Creek, Peedee). Updip units of the Tertiary section are mainly sand and clay, becoming increasingly calcareous downdip. The lower two Tertiary units are correlative with the Black Mingo Group (Ellenton, Williamsburg). Two middle units are correlative with the Orangeburg Group (Congaree, Santee) and the upper three units correlate with the Barnwell Group (Clinchfield, Dry Branch, Tobacco Road). Hydrologic and lithologic data are used to delineate three regional aquifer systems at the downdip terminus of the section; two in the Cretaceous and one in the Tertiary. Updip where the Cretaceous clays cease to act as an effective confining unit, the two aquifer systems coalesce resulting in one Cretaceous and one Tertiary aquifer system. Farther updip the Tertiary confining system pinches out and the entire sedimentary sequence acts as a single aquifer system.

Gellici, J.A.; Logan, W.R. (South Carolina Water Resources Commission, Columbia, SC (United States))

1993-03-01

184

Shrinking and swelling clays under droughts: measurements at the Mormoiron test-site and first analyses (Vaucluse, South-East of France)  

NASA Astrophysics Data System (ADS)

In France, exceptional periods of rainfall deficit (1976, 1989 to 1991 and 1996 to 1997) have caused damages to houses due to their vulnerability to shrinking and swelling clays phenomenon. Between 1998 and 2010, BRGM has been producing a national hazard map related to shrinking and swelling clays, built by crossing geological data and information on density of damages for each geological formation (methodology developed since 1995). The intense drought of summer 2003 has pointed out the necessity of a better understanding of this phenomenon. At the request of the French Ministry of Environment, BRGM has developed a new method for measuring the moisture evolution with depth in order to study its impact on the swelling capacity of clayed soil. The site of Mormoiron (Vaucluse, South-East of France) has then been instrumented for that purpose, with moisture sensors (since December 2004) and extensometers (since March 2009) at different depths. These data have been used to test and improve existing empirical models which are supposed to assess settlements and swellings, depending on the soil water content. Compilations of different measurements have shown, after basic processing made on the data (filtering, resampling, etc.), evident correlations between rain and surface displacements. The model finally obtained gives quite good dependence between these two quantities for the uppermost soil layers (0.2m and 0.5m). More research are being undertaken to physically explain this relationship, particularly for deeper layers. These results should lead to propose a calibrated model for predicting soil deformations from climatic data.

Gourdier, Sébastien; Vandromme, Rosalie; Grandjean, Gilles

2013-04-01

185

A Hydrostratigraphic Model of the Pahute Mesa - Oasis Valley Area, Nye County, Nevada  

SciTech Connect

A 3-D hydrostratigraphic framework model has been built for the use of hydrologic modelers who are tasked with developing a model to determine how contaminants are transported by groundwater flow in an area of complex geology. The area of interest includes Pahute Mesa, a former nuclear testing area at the Nevada Test Site (NTS), and Oasis Valley, a groundwater discharge area down-gradient from contaminant source areas on Pahute Mesa. To build the framework model, the NTS hydrogeologic framework was integrated with an extensive collection of drill-hole data (stratigraphic, lithologic, and alteration data); a structural model; and several recent geophysical, geological, and hydrological studies to formulate a hydrostratigraphic system. The authors organized the Tertiary volcanic units in the study area into 40 hydrostratigraphic units that include 16 aquifers, 13 confining units, and 11 composite units. The underlying pre-Tertiary rocks were divided into six hydrostratigraphic units, including two aquifers and four confining units. The model depicts the thickness, extent, and geometric relationships of these hydrostratigraphic units (''layers'' in the model) along with all the major structural features that control them, including calderas and faults. The complexity of the model area and the non-uniqueness of some of the interpretations incorporated into the base model made it necessary to address alternative interpretations for some of the major features in the model. Six of these alternatives were developed so they could be modeled in the same fashion as the base model.

S. L. Drellack, Jr.; L. B. Prothro; J. L. Gonzales

2001-12-01

186

East Timor  

NSDL National Science Digital Library

This Week's In the News examines the escalation of violence and the proposal for autonomy in the Indonesian province of East Timor. Last weekend, anti-independence militiamen killed dozens of separatist activists in Dili, the East Timorese capital, intensifying the fierce bloodshed and political tumult in the province. The recent massacre is just one of several brutal episodes that have plagued East Timor in the past quarter-century. The people of the embattled island have suffered numerous human rights violations, have endured economic collapse, and have been decimated by guerrilla warfare, famine, and disease. Over 200,000 East Timorese -- or nearly one-fourth of the population -- have died in the troubles, which began in 1975 when Portugal abruptly abandoned East Timor after 400 years of colonial rule. Unstable and vulnerable, the newly independent East Timor was quickly invaded, occupied, and annexed in 1976 by Indonesia, a stronger nation that quashed all subsequent separatist movements. Last January, after years of political oppression, Indonesia's parliament finally succumbed to international pressure and announced that it would grant East Timor either full independence or autonomy within the Indonesian state. The United Nations, although it has never officially recognized Indonesia's sovereignty over East Timor, plans to supervise a vote, tentatively scheduled for July, wherein the East Timorese will determine whether they want full independence or provincial autonomy. Later this week, Foreign Ministers Ali Alatas of Indonesia and Jaime Gama of Portugal are meeting in New York with UN Secretary-General Kofi Annan to discuss the East Timorese autonomy option and plan for the pending UN-monitored poll. However, the recent resurgence of violence between anti- and pro-independence factions in and around Dili threatens the viability of the proposed poll and endangers the stability of East Timor's self-determination. The nine resources discussed offer background information, the latest news, political analysis, and social commentary.

Osmond, Andrew.

1999-01-01

187

Upper Crustal Structure above Off-axis Magma Lenses at RIDGE-2000 East Pacific Rise Integrated Study Site from 2008 3D Multichannel Seismic Reflection Data  

NASA Astrophysics Data System (ADS)

During the 2008 multi-streamer 3D seismic reflection experiment conducted aboard the R/V Marcus Langseth at the RIDGE-2000 Integrated Study Site at the East Pacific Rise between 9°37'N and 9°57'N, three regions with prominent near-axis crustal reflectors (near 9° 54'N, 9° 52’N, 9° 39’N) were discovered and interpreted as off-axis melt lenses (OAML) injected at mid-crustal levels to both the east and west of the ridge crest. To study the effects of OAML on upper crustal structure, we applied 2-D processing on two across-axis lines of a small 3D grid that crosses part of the southernmost OAML: Line 1428P (9° 38’N) across the middle part of the OAML and line 1476P (9° 39’N) across the northern end of this OAML. The preliminary results show that the OAML reflections are clear and bright on profile 1428P whereas a weak OAML reflection is imaged on 1476P. The axial magma lens reflections on both lines are at similar depths of 620 ms twtt. The OAML reflection on 1428P is at 700 ms twtt while the OAML reflection on 1476P lies 200 ms twtt deeper, indicating it may be the diffraction from the northern edge of the OAML. Continuous layer 2A events are seen on both 1428P and 1476P profiles with layer 2A thickness approximately 150 ms twtt on-axis and 300 ms off-axis. On 1428P, optimal stacking velocities for layer 2A above the OAML on the eastern flank are about 50 m/s lower than the velocities for layer 2A on the western flank. However, on 1476P, no differences in layer 2A velocities between the western and eastern flank are evident. These observations of layer 2A structure indicate that the presence of OAML is accompanied by changes in upper crustal structure, which may reflect off-axis magmatism and alteration associated with off-axis hydrothermal circulation. One-dimensional forward modeling of CMP gathers will be conducted to further characterize layer 2A and upper 2B velocity structure.

Han, S.; Carbotte, S. M.; Carton, H. D.; Mutter, J. C.; Canales, J.; Nedimovic, M. R.

2009-12-01

188

37. PRATER CANYON AND CIVILIAN CONSERVATION CORPS CAMP SITE FROM ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

37. PRATER CANYON AND CIVILIAN CONSERVATION CORPS CAMP SITE FROM PRATER GRADE, FACING E. SAME CAMERA LOCATION AS No. 35 AND No. 36. - Mesa Verde National Park Main Entrance Road, Cortez, Montezuma County, CO

189

The Pleistocene evolution of the East Antarctic Ice Sheet in the Prydz bay region: Stable isotopic evidence from ODP Site 1167  

USGS Publications Warehouse

Ocean Drilling Program Leg 188, Prydz Bay, East Antarctica is part of a larger initiative to explore the Cenozoic history of the Antarctic Ice Sheet through direct drilling and sampling of the continental margins. In this paper, we present stable isotopic results from Ocean Drilling Program (ODP) Site 1167 located on the Prydz Channel Trough Mouth Fan (TMF), the first Antarctic TMF to be drilled. The foraminifer-based ??18O record is interpreted along with sedimentary and downhole logging evidence to reconstruct the Quaternary glacial history of Prydz Bay and the adjacent Lambert Glacier Amery Ice Shelf System (LGAISS). We report an electron spin resonance age date of 36. 9 ?? 3.3 ka at 0.45 m below sea floor and correlate suspected glacial-interglacial cycles with the global isotopic stratigraphy to improve the chronology for Site 1167. The ??18O record based on planktonic (Neogloboquadrina pachyderma (s.)) and limited benthic results (Globocassidulina crassa), indicates a trend of ice sheet expansion that was interrupted by a period of reduced ice volume and possibly warmer conditions during the early-mid-Pleistocene (0.9-1.38 Ma). An increase in ?? 18O values after ??? 900 ka appears to coincide with the mid-Pleistocene climate transition and the expansion of the northern hemisphere ice sheet. The ??18O record in the upper 50 m of the stratigraphic section indicates as few as three glacial-interglacial cycles, tentatively assigned as marine isotopic stages (MIS) 16-21, are preserved since the Brunhes/Matuyama paleomagnetic reversal (780 ka). This suggests that there is a large unconformity near the top of the section and/or that there may have been few extreme advances of the ice sheet since the mid-Pleistocene climate transition resulting in lowered sedimentation rates on the Prydz Channel TMF. The stable isotopic record from Site 1167 is one of the few available from the area south of the Antarctic Polar Front that has been linked with the global isotopic stratigraphy. Our results suggest the potential for the recovery of useful stable isotopic records in other TMFs. ?? 2003 Elsevier B.V. All rights reserved.

Theissen, K.M.; Dunbar, R.B.; Cooper, A. K.; Mucciarone, D.A.; Hoffmann, D.

2003-01-01

190

Subsurface structure of a submarine hydrothermal system in ocean crust formed at the East Pacific Rise, ODP/IODP Site 1256  

NASA Astrophysics Data System (ADS)

ODP/IODP Hole 1256D penetrates an in situ section of ocean crust formed at the East Pacific Rise, through lavas and sheeted dikes and ˜100 m into plutonic rocks. We use mineralogy, oxygen isotopes, and fluid inclusions to understand hydrothermal processes. The lavas are slightly altered at low temperatures (<150°C) to phyllosilicates and iron oxyhydroxides, with a stepwise increase in grade downward to greenschist minerals in the upper dikes. This resulted from generally upwelling hydrothermal fluids in the dikes mixing with cooler seawater solutions in the lavas, also producing minor metal sulfide mineralization in the upper dikes. Alteration grade increases downward in the dikes, with increasing recrystallization to amphibole and loss of metals at higher temperatures (>350°C up to ˜600°C). Intrusion of gabbro bodies into the lower dikes resulted in contact metamorphism to granoblastic hornfels at 850°C-900°C, representing a thermal boundary layer between the axial melt lens and the overlying hydrothermal system. Downward penetration of hydrothermal fluids led to rehydration of granoblastic dikes and plutonic rocks at ˜800°C down to <300°C. Fluid inclusion and oxygen isotope data show that vein quartz formed at ˜300°C to >450°C from hydrothermal fluids that were affected by supercritical phase separation. Fluids had variable salinities and were enriched in 18O (+0.4‰ to +3.5‰) relative to seawater, similar to seafloor vent fluids. Dike margins are brecciated and mineralized, suggesting hydrothermal activity coeval with magmatism. Anhydrite formed mainly in the upper dikes when partly reacted seawater fluids were heated as they penetrated deeper into the system. Low-temperature alteration of the volcanic section continued as cold seawater penetrated along fluid pathways, forming minor iron oxyhydroxides in the rocks. Hydrothermal processes at Site 1256 fit with current models whereby greenschist alteration of dikes at low water/rock ratios is overprinted by fracture-controlled alteration and mineralization by upwelling hydrothermal fluids, a conductive boundary layer above gabbroic intrusions, leaching of metals from dikes and gabbros in the deep "root zone," and stepped thermal and alteration gradients in the basement. The Site 1256 section, however, is intact and retains recharge effects (anhydrite), allowing an integrated view of processes in the subsurface.

Alt, Jeffrey C.; Laverne, Christine; Coggon, Rosalind M.; Teagle, Damon A. H.; Banerjee, Neil R.; Morgan, Sally; Smith-Duque, Christopher E.; Harris, Michelle; Galli, Laura

2010-10-01

191

The Middle East Institute  

NSDL National Science Digital Library

Dedicated to "keeping the public objectively informed about the Middle East," the Middle East Institute provides a number of resources to this end. Visitors to the site can access the table of contents, abstracts, and some complete articles from The Middle East Journal; read online policy briefs about current events in the region; review descriptions of the Institute's published monographs; and consult an online searchable catalog of over 2,400 scholarly works in Middle Eastern studies published in the 1990s. The XML-based catalog can be searched by keyword, title, author, or any of the cataloged fields. Two online texts are also posted here: An Introduction to Islam (see the September 3, 1999 Scout Report) and, in the rare books section of the library, Mehemet the Kurd and Other Tales by Charles Wells (requires multidoc pro to view TEI (SGML)).

2001-01-01

192

Completion Report for Well ER-12-3 Corrective Action Unit 99: Rainier Mesa - Shoshone Mountain  

SciTech Connect

Well ER-12-3 was drilled for the U.S. Department of Energy, National Nuclear Security Administration Nevada Site Office, in support of the Nevada Environmental Restoration Project at the Nevada Test Site, Nye County, Nevada. The well was drilled in March and April 2005 as part of a hydrogeologic investigation program for the Rainier Mesa-Shoshone Mountain Corrective Action Unit. The overall purpose of the well was to gather subsurface data to better characterize the hydrogeology of central Rainier Mesa, especially in the older Tertiary volcanic rocks and Paleozoic sedimentary rocks. The main 47.0-centimeter hole was drilled to a depth of 799.2 meters and cased with 33.97-centimeter casing to 743.1 meters. The hole diameter was then decreased to 31.1 centimeters, and the well was drilled to a total depth of 1,496.0 meters. The completion string consisted of 13.97-centimeter stainless steel casing, with two slotted intervals open to the lower carbonate aquifer, suspended from 19.37-centimeter carbon steel casing. A piezometer string was installed outside the 33.97-centimeter casing to a depth of 467.1 meters to monitor a zone of perched water within the Tertiary volcanic section. Data gathered during and shortly after hole construction include composite drill cuttings samples collected every 3 meters (extra cuttings samples were collected from the Paleozoic rocks for paleontological analyses), sidewall core samples from 35 depths, various geophysical logs, and water level measurements. These data indicate that the well penetrated 674.2 meters of Tertiary volcanic rocks and 821.7 meters of Paleozoic dolomite and limestone. Forty-nine days after the well was completed, but prior to well development and testing, the water level inside the main hole was tagged at the depth of 949.1 meters, and the water level inside the piezometer string was tagged at 379.9 meters.

U.S. Department of Energy, National Nuclear Security Administration Nevada Site Office; Bechtel Nevada Corporation

2006-05-01

193

Coal slurry pipelines: Blach Mesa and future projects  

SciTech Connect

Most people in the mining industry have some familiarity with pipelining of minerals in slurry form, however, many may not realize the extent that mineral slurry pipeline transport is used throughout the world. The author is referring to the shipment of the minerals in the raw or concentrate form, not tailings pipelines which are also commonplace in the minerals industry. There are over forty mineral pipelines around the world. The list covers a wide range of minerals, including copper ore concentrate, iron ore concentrate, limestone, phosphate concentrate, kaolin, Gilsonite and gold ore, with only eleven of the mineral pipelines located in the USA. It should be noted that one of the earliest slurry pipelines was a 108 mile coal slurry pipeline in Ohio, which started up in 1957. The pipeline only operated until 1963 when a railroad company literally bought out the transportation contract. This really was the beginning of the unit train concept. Each mineral has specific physical and chemical characteristics to be considered when evaluating transport by pipeline. The processing required at the pipeline origin, as well as at the pipeline termination, are also important factors in determining slurry pipeline feasibility. Transport distance, annual volume, and continuity of shipments are other important factors. One of the most difficult minerals to transport as a slurry is coal because the specific gravity is closer to water than most other minerals. Thus, the fine balance of creating enough fine particles to serve as a carrier for the coarser material, while at the same time having a material that can be economically dewatered is very sensitive and technical designs will vary with types of coal. Additionally, since coal is purchased for its thermal value, excess surface moisture can lower the value of the coal to the customer. One of the most successful slurry pipeline operations, and the only current operating long-distance coal slurry pipeline is the Black Mesa Pipeline System. The Black Mesa Pipeline is a 273 mile (439 km) long, 18-inch (457 mm) coal/water slurry pipeline, originating on the Black Mesa in the Northeastern part of Arizona, USA. The system delivers coal from the Peabody Coal Company`s Black Mesa open pit mine to the Mohave Generating Station which is a 1580 MW steam powered electric generating plant located in Laughlin, Nevada. Black Mesa Pipeline began commercial operation in November, 1970 and has transported in excess of 110,000,000 tons (99,800,000 metric tons) of coal with an availability factor of 99%.

Brolick, H.J. [Williams Technologies Inc. (United States)

1998-12-31

194

Availability, Sustainability, and Suitability of Ground Water, Rogers Mesa, Delta County, Colorado - Types of Analyses and Data for Use in Subdivision Water-Supply Reports  

USGS Publications Warehouse

The population of Delta County, Colorado, like that in much of the Western United States, is forecast to increase substantially in the next few decades. A substantial portion of the increased population likely will reside in rural subdivisions and use residential wells for domestic water supplies. In Colorado, a subdivision developer is required to submit a water-supply plan through the county for approval by the Colorado Division of Water Resources. If the water supply is to be provided by wells, the water-supply plan must include a water-supply report. The water-supply report demonstrates the availability, sustainability, and suitability of the water supply for the proposed subdivision. During 2006, the U.S. Geological Survey, in cooperation with Delta County, Colorado, began a study to develop criteria that the Delta County Land Use Department can use to evaluate water-supply reports for proposed subdivisions. A table was prepared that lists the types of analyses and data that may be needed in a water-supply report for a water-supply plan that proposes the use of ground water. A preliminary analysis of the availability, sustainability, and suitability of the ground-water resources of Rogers Mesa, Delta County, Colorado, was prepared for a hypothetical subdivision to demonstrate hydrologic analyses and data that may be needed for water-supply reports for proposed subdivisions. Rogers Mesa is a 12-square-mile upland mesa located along the north side of the North Fork Gunnison River about 15 miles east of Delta, Colorado. The principal land use on Rogers Mesa is irrigated agriculture, with about 5,651 acres of irrigated cropland, grass pasture, and orchards. The principal source of irrigation water is surface water diverted from the North Fork Gunnison River and Leroux Creek. The estimated area of platted subdivisions on or partially on Rogers Mesa in 2007 was about 4,792 acres of which about 2,756 acres was irrigated land in 2000. The principal aquifer on Rogers Mesa consists of alluvial-fan deposits that overlie shale and, locally, sandstone. Maps of the base of the aquifer, the water table, and the saturated thickness of the aquifer were prepared from data from the well files of the Colorado Division of Water Resources. The base of the aquifer generally is topographically higher than the valleys of the North Fork Gunnison River and Leroux Creek, and direct hydraulic connection of the aquifer to North Fork Gunnison River and Leroux Creek is limited. The aquifer is recharged primarily by infiltration of surface water diverted for irrigation. Ground water discharges to seeps and springs and through slope deposits at the boundaries of the aquifer. Data from the well files also were used to estimate the specific capacity of wells and to estimate the transmissivity and hydraulic conductivity of the aquifer. A water budget was used to estimate recharge to and discharge from the aquifer. Although storage within the aquifer likely varies seasonally and from year to year, it was assumed that there were no long-term changes in ground-water storage. Estimated average annual recharge to and discharge from the aquifer during November 1998 through October 2006 were about 30,767 acre-feet per year. Although sufficient ground water is available on Rogers Mesa for additional domestic water supplies, conversion of irrigated land to residential land use likely would reduce recharge to the aquifer, affecting the sustainability of ground-water supplies on Rogers Mesa. Stream-depletion analyses indicate that the ground water in the aquifer likely would be considered tributary ground water and additional uses of ground water to supply new subdivisions likely would require implementation of augmentation plans. Although sufficient ground water is available on Rogers Mesa for additional domestic water supplies, conversion of irrigated land to residential land use likely would reduce recharge to the aquifer, affecting the sustainability

Watts, Kenneth R.

2008-01-01

195

East Timor Referendum  

NSDL National Science Digital Library

The East Timorese capital Dili was once again the scene of protest and violence this week, just days before a UN-supervised referendum. On Monday, East Timor's 800,000 residents will choose whether to remain part of Indonesia as an autonomous province or to establish an independent nation. A Portuguese colony for 400 years, East Timor was independent for about a year before it was invaded and annexed by Indonesia in 1976. After decades of military repression and civil strife (see the April 20, 1999 Scout Report for Social Sciences), the post-Suharto Indonesian government announced it would allow the East Timorese to decide their own political fate. In their strongest showing so far, pro-independence advocates organized a rally of up to 10,000 people in the capital on Wednesday. A counter-rally the next day resulted in the worst violence since April, when dozens were killed by anti-independence militias. Despite the violence and continued threats by these militias, United Nations Secretary-General Kofi Annan has made it clear that the twice-postponed vote will be held on Monday as scheduled. The sites listed provide information about East Timor and this historic referendum.

De Nie, Michael W.

196

Deep reflection structure imaged by the 2008 3D seismic reflection Survey at the RIDGE- 2000 East Pacific Rise Integrated Studies Site  

NASA Astrophysics Data System (ADS)

The first multi-source and multi-streamer 3D seismic reflection experiment carried out using academic resources was done aboard the R/V Marcus G. Langseth in Summer 2008 during cruise MGL0812. The targeted area was the RIDGE-2000 Integrated Studies Site at the East Pacific Rise. Our primary 3D survey grid extends from about 9° 57'N to 9° 42'N, with a smaller grid just to the south covering approximately from 9° 40'N to 9° 37.5'N. Additionally, about 1 and 0.5 km wide across-ridge-axis swaths of data were collected at 9° 36'N and 9°30'N respectively, as well as an along-ridge-axis swath about 1 km wide and extending from 10° 05'N to 9° 40'N. We here focus on a preliminary analysis of the reflection structure imaged within the lower crust and uppermost mantle. Moho reflection arrivals are imaged through much of the investigated area. The character of Moho reflection events varies from simple, single reflection wavelet to more complex arrivals indicating spatial changes in structure within the Moho transition zone. Particularly strong Moho reflections are observed in the southern half of the main 3D grid. In places, Moho reflection event appears to extend across the ridge axis potentially suggesting "zero-age" Moho development. Weak Moho arrivals are found at the north end of the main 3D box and within the smaller box to the south. Most notable place lacking Moho reflections is the Lamont seamount area where Moho is not observed on either side of the ridge axis, although the area lacking Moho reflections is wider on the western ridge flank. Further south, along the across-ridge-axis swaths, Moho reflections again become more pronounced. A suit of what mostly appear to be reflection events is recognized between the AMC and Moho. Many of them do not appear to be multiples, and their origin is not well understood. Possible origins for these events include: lower boundary of the AMC, S-converted waves, and lower crustal melt lenses. Along sections of the two 3D grids, possible subhorizontal, low signal-to-noise ratio mantle reflections are identified 1-2 s after the Moho reflection. Arrivals potentially originating from lower crustal melt sills, zero-age Moho, and mantle reflections are all of critical importance for understanding fast spreading centers. In the years to follow, we will put significant effort to analyze the identified arrivals in order to determine their origin and find where they fit within the crustal accretionary puzzle.

Nedimovi?, M. R.; Carbotte, S. M.; Mutter, J. C.; Canales, P. J.; Carton, H.; Aghaei, O.; Marjanovi?, M.; Newman, K. R.; Hu, M.; Stowe, L.

2008-12-01

197

Geology of the Wilkes land sub-basin and stability of the East Antarctic Ice Sheet: Insights from rock magnetism at IODP Site U1361  

NASA Astrophysics Data System (ADS)

IODP Expedition 318 drilled Site U1361 on the continental rise offshore of Adélie Land and the Wilkes subglacial basin. The objective was to reconstruct the stability of the East Antarctic Ice Sheet (EAIS) during Neogene warm periods, such as the late Miocene and the early Pliocene. The sedimentary record tells a complex story of compaction, and erosion (thus hiatuses). Teasing out the paleoenvironmental implications is essential for understanding the evolution of the EAIS. Anisotropy of magnetic susceptibility (AMS) is sensitive to differential compaction and other rock magnetic parameters like isothermal remanence and anhysteretic remanence are very sensitive to changes in the terrestrial source region. In general, highly anisotropic layers correspond with laminated clay-rich units, while more isotropic layers are bioturbated and have less clay. Layers enriched in diatoms are associated with the latter, which also have higher Ba/Al ratios consistent with higher productivity. Higher anisotropy layers have lower porosity and moisture contents and have fine grained magnetic mineralogy dominated by maghemite, the more oxidized form of iron oxide, while the lower anisotropy layers have magnetic mineralogies dominated by magnetite. The different magnetic mineralogies support the suggestion based on isotopic signatures by Cook et al. (2013) of different source regions during low productivity (cooler) and high productivity (warmer) times. These two facies were tied to the coastal outcrops of the Lower Paleozoic granitic terranes and the Ferrar Large Igneous Province in the more inland Wilkes Subglacial Basin respectively. Here we present evidence for a third geological unit, one eroded at the boundaries between the high and low clay zone with a “hard” (mostly hematite) dominated magnetic mineralogy. This unit likely outcrops in the Wilkes subglacial basin and could be hydrothermally altered Beacon sandstone similar to that detected by Craw and Findlay (1984) in Taylor Valley or the equivalent to the Elatina Formation in the Adelaide Geosyncline in Southern Australia (Schmidt and Williams, 2013). Correlation of the “hard” events with global oxygen isotope stacks of Zachos et al. (2001) and Lisiecki and Raymo (2005) suggest that the source region was eroded during times with higher global ice volume.

Tauxe, L.; Sugisaki, S.; Jiménez-Espejo, F.; Escutia, C.; Cook, C. P.; van de Flierdt, T.; Iwai, M.

2015-02-01

198

TYBO/BENHAM: Model Analysis of Groundwater Flow and Radionuclide Migration from Underground Nuclear Tests in Southwestern Pahute Mesa, Nevada  

SciTech Connect

Recent field studies have led to the discovery of trace quantities of plutonium originating from the BENHAM underground nuclear test in two groundwater observation wells on Pahute Mesa at the Nevada Test Site. These observation wells are located 1.3 km from the BENHAM underground nuclear test and approximately 300 m from the TYBO underground nuclear test. In addition to plutonium, several other conservative (e.g. tritium) and reactive (e.g. cesium) radionuclides were found in both observation wells. The highest radionuclide concentrations were found in a well sampling a welded tuff aquifer more than 500m above the BENHAM emplacement depth. These measurements have prompted additional investigations to ascertain the mechanisms, processes, and conditions affecting subsurface radionuclide transport in Pahute Mesa groundwater. This report describes an integrated modeling approach used to simulate groundwater flow, radionuclide source release, and radionuclide transport near the BENHAM and TYBO underground nuclear tests on Pahute Mesa. The components of the model include a flow model at a scale large enough to encompass many wells for calibration, a source-term model capable of predicting radionuclide releases to aquifers following complex processes associated with nonisothermal flow and glass dissolution, and site-scale transport models that consider migration of solutes and colloids in fractured volcanic rock. Although multiple modeling components contribute to the methodology presented in this report, they are coupled and yield results consistent with laboratory and field observations. Additionally, sensitivity analyses are conducted to provide insight into the relative importance of uncertainty ranges in the transport parameters.

Andrew Wolfsberg; Lee Glascoe; Guoping Lu; Alyssa; Olson; Peter Lichtner; Maureen McGraw; Terry Cherry; ,; Guy Roemer

2002-09-01

199

Preliminary Map of Landslide Deposits in the Mesa Verde National Park Area, Colorado  

USGS Publications Warehouse

This report presents a preliminary map of landslide deposits in the Mesa Verde National Park area (see map sheet) at a compilation scale of 1:50,000. Landslide is a general term for landforms produced by a wide variety of gravity-driven mass movements, including various types of flows, slides, topples and falls, and combinations thereof produced by the slow to rapid downslope transport of surficial materials or bedrock. The map depicts more than 200 landslides ranging in size from small (0.01 square miles) earthflows and rock slumps to large (greater than 0.50 square miles) translational slides and complex landslides (Varnes, 1978). This map has been prepared to provide a regional overview of the distribution of landslide deposits in the Mesa Verde area, and as such constitutes an inventory of landslides in the area. The map is suitable for regional planning to identify broad areas where landslide deposits and processes are concentrated. It should not be used as a substitute for detailed site investigations. Specific areas thought to be subject to landslide hazards should be carefully studied before development. Many of the landslides depicted on this map are probably stable as they date to the Pleistocene (approximately 1.8-0.011 Ma) and hence formed under a different climate regime. However, the recognition of these landslides is important because natural and human-induced factors can alter stability. Reduction of lateral support (by excavations or roadcuts), removal of vegetation (by fire or development), or an increase in pore pressure (by heavy rains) may result in the reactivation of landslides or parts of landslides.

Carrara, Paul E.

2009-01-01

200

MESAFace, a graphical interface to analyze the MESA output  

PubMed Central

MESA (Modules for Experiments in Stellar Astrophysics) has become very popular among astrophysicists as a powerful and reliable code to simulate stellar evolution. Analyzing the output data thoroughly may, however, present some challenges and be rather time-consuming. Here we describe MESAFace, a graphical and dynamical interface which provides an intuitive, efficient and quick way to analyze the MESA output. Nature of problem: Find a way to quickly and thoroughly analyze the output of a MESA run, including all the profiles, and have an efficient method to produce graphical representations of the data. Solution method: We created two scripts (to be run consecutively). The first one downloads all the data from a MESA run and organizes the profiles in order of age. All the files are saved as tables or arrays of tables which can then be accessed very quickly by Mathematica. The second script uses the Manipulate function to create a graphical interface which allows the user to choose what to plot from a set of menus and buttons. The information shown is updated in real time. The user can access very quickly all the data from the run under examination and visualize it with plots and tables. Unusual features: Moving the slides in certain regions may cause an error message. This happens when Mathematica is asked to read nonexistent data. The error message, however, disappears when the slides are moved back. This issue does not preclude the good functioning of the interface. Additional comments: The program uses the dynamical capabilities of Mathematica. When the program is opened, Mathematica prompts the user to ”Enable Dynamics”. It is necessary to accept before proceeding. Running time: Depends on the size of the data downloaded, on where the data are stored (hard-drive or web), and on the speed of the computer or network connection. In general, downloading the data may take from a minute to several minutes. Loading directly from the web is slower. For example, downloading a 200MB data folder (a total of 102 files) with a dual-core Intel laptop, P8700, 2 GB of RAM, at 2.53 GHz took about a minute from the hard-drive and about 23 minutes from the web (with a basic home wireless connection). PMID:24563547

Giannotti, M.; Wise, M.; Mohammed, A.

2014-01-01

201

The Evolution of ONeMg Cores with MESA  

NASA Astrophysics Data System (ADS)

We present calculations of the evolution of degenerate cores composed primarily of oxygen, neon, and magnesium which are undergoing compression. We make use of the state-of-the-art MESA stellar evolution code, with updated weak reaction rates from Martinez-Pinedo et al. (2014). We perform a detailed parameter study of the effects a number of quantities, including the accretion rate, magnesium mass fraction, and initial core temperature. We discuss the final fate of these ONeMg cores, focusing on cores formed as a result of the merger of two carbon-oxygen white dwarfs.

Schwab, Josiah; Quataert, Eliot; Bildsten, Lars

2015-01-01

202

MESA: Making Excellent Science Requires More Than Just Scientists  

NASA Astrophysics Data System (ADS)

Supporting successful astronomical missions requires more than brighter minds with a vision. It requires a strong team from a wide variety of disciplines working together towards a common goal: support the Space Telescope Science Institute (STScI) missions and excel while doing it. Here I present the main steps we have taken to meet the challenges ahead, with special attention to the combined effort between scientists and developers, along with an overview of the projects currently under the purview of the Mission Engineering and Science Analysis (MESA) group at the STScI.

Diaz, R.

2014-05-01

203

MESA Models of Classical Nova Outbursts Novae are cataclysmic variables driven by  

E-print Network

MESA Models of Classical Nova Outbursts Novae are cataclysmic variables driven by accretion of H (http://mesa.sourceforge.net) to construct multi-cycle evolution sequences of novae with CO WD cores. We-envelope interface. In the first case, which is commonly accepted in 1D nova simulations, the CBM was mimicked

Herwig, Falk

204

The MESA Way: A Success Story of Nurturing Minorities for Math/Science-Based Careers.  

ERIC Educational Resources Information Center

Significant steps have been taken by the Mathematics, Engineering, Science Achievement (MESA) project since its formation in 1970. The founders of MESA began a campaign, first in high schools, and later in middle and elementary schools, to convince educators, parents, and students of the importance of raising standards for the minority children…

Somerton, Wilbur H.; And Others

205

MESA/MEP at American River College: Year One Evaluation Report.  

ERIC Educational Resources Information Center

In 1989, the Mathematics, Engineering, and Science Achievement (MESA)/Minority Engineering Program (MEP) was initiated at American River College. The MESA/MEP program recruits Black, Hispanic, and Native American students and provides assistance, encouragement, and enrichment programs to help them succeed in the fields of mathematics, engineering,…

Lee, Beth S.; And Others

206

Ethnographic Evaluation of the MESA Program at a South-Central Phoenix High School.  

ERIC Educational Resources Information Center

MESA (Mathematics, Engineering, and Science Achievement) is a program designed to increase the number of underrepresented ethnic groups in professions related to mathematics, engineering, and the physical sciences. This paper describes and evaluates the MESA program at Jarama High School, Phoenix (Arizona), using informal interviews and…

Jaramillo, James A.

207

Gravity and magnetic study of the Pahute Mesa and Oasis Valley region, Nye County, Nevada  

USGS Publications Warehouse

Regional gravity and aeromagnetic maps reveal the existence of deep basins underlying much of the southwestern Nevada volcanic field, approximately 150 km northwest of Las Vegas. These maps also indicate the presence of prominent features (geophysical lineaments) within and beneath the basin fill. Detailed gravity surveys were conducted in order to characterize the nature of the basin boundaries, delineate additional subsurface features, and evaluate their possible influence on the movement of ground-water. Geophysical modeling of gravity and aeromagnetic data indicates that many of the features may be related to processes of caldera formation. Collapse of the various calderas within the volcanic field resulted in dense basement rocks occurring at greater depths within caldera boundaries. Modeling indicates that collapse occurred along faults that are arcuate and steeply dipping. There are indications that the basement in the western Pahute Mesa - Oasis Valley region consists predominantly of granitic and/or fine-grained siliceous sedimentary rocks that may be less permeable to groundwater flow than the predominantly fractured carbonate rock basement to the east and southeast of the study area. The northeast-trending Thirsty Canyon lineament, expressed on gravity and basin thickness maps, separates dense volcanic rocks on the northwest from less dense intracaldera accumulations in the Silent Canyon and Timber Mountain caldera complexes. The source of the lineament is an approximately 2-km wide ring fracture system with step-like differential displacements, perhaps localized on a pre-existing northeast-trending Basin and Range fault. Due to vertical offsets, the Thirsty Canyon fault zone probably juxtaposes rock types of different permeability and, thus, it may act as a barrier to ground-water flow and deflect flow from Pahute Mesa along its flanks toward Oasis Valley. Within the Thirsty Canyon fault zone, highly fractured rocks may serve also as a conduit, depending upon the degree of alteration and its effect on porosity and permeability. In the Oasis Valley region, other structures that may influence ground-water flow include the western and southern boundaries of the Oasis Valley basin, where the basement abruptly shallows.

Mankinen, Edward A.; Hildenbrand, Thomas G.; Dixon, Gary L.; McKee, Edwin H.; Fridrich, Christopher J.; Laczniak, Randell J.

1999-01-01

208

Gravity and magnetic study of the Pahute Mesa and Oasis Valley region, Nye County, Nevada  

SciTech Connect

Regional gravity and aeromagnetic maps reveal the existence of deep basins underlying much of the southwestern Nevada volcanic field, approximately 150 km northwest of Las Vegas. These maps also indicate the presence of prominent features (geophysical lineaments) within and beneath the basin fill. Detailed gravity surveys were conducted in order to characterize the nature of the basin boundaries, delineate additional subsurface features, and evaluate their possible influence on the movement of ground water. Geophysical modeling of gravity and aeromagnetic data indicates that many of the features may be related to processes of caldera formation. Collapse of the various calderas within the volcanic field resulted in dense basement rocks occurring at greater depths within caldera boundaries. Modeling indicates that collapse occurred along faults that are arcuate and steeply dipping. There are indications that the basement in the western Pahute Mesa - Oasis Valley region consists predominantly of granitic and/or fine-grained siliceous sedimentary rocks that may be less permeable to ground-water flow than the predominantly fractured carbonate rock basement to the east and southeast of the study area. The northeast-trending Thirsty Canyon lineament, expressed on gravity and basin thickness maps, separates dense volcanic rocks on the northwest from less dense intracaldera accumulations in the Silent Canyon and Timber Mountain caldera complexes. The sources of the lineament is an approximately 2-km wide ring fracture system with step-like differential displacements, perhaps localized on a pre-existing northeast-trending Basin and Range fault. Due to vertical offsets, the Thirsty Canyon faults zone probably juxtaposes rock types of different permeability and, thus, it may act as a barrier to ground-water flow and deflect flow from Pahute Mesa along its flanks toward Oasis Valley. Within the Thirsty Canyon fault zone, highly fractured rocks may serve also as a conduit, depending upon the degree of alteration and its effect on porosity and permeability. In the Oasis Valley region, other structures that may influence ground-water flow include the western and southern boundaries of the Oasis Valley basin, where the basement abruptly shallows.

Dixon, G.L.; Fridrich, C.J.; Hildenbrand, T.G.; Laczniak, R.J.; Mankinen, E.A.; McKee, E.H.

1999-08-31

209

MODULES FOR EXPERIMENTS IN STELLAR ASTROPHYSICS (MESA): PLANETS, OSCILLATIONS, ROTATION, AND MASSIVE STARS  

SciTech Connect

We substantially update the capabilities of the open source software package Modules for Experiments in Stellar Astrophysics (MESA), and its one-dimensional stellar evolution module, MESA star. Improvements in MESA star's ability to model the evolution of giant planets now extends its applicability down to masses as low as one-tenth that of Jupiter. The dramatic improvement in asteroseismology enabled by the space-based Kepler and CoRoT missions motivates our full coupling of the ADIPLS adiabatic pulsation code with MESA star. This also motivates a numerical recasting of the Ledoux criterion that is more easily implemented when many nuclei are present at non-negligible abundances. This impacts the way in which MESA star calculates semi-convective and thermohaline mixing. We exhibit the evolution of 3-8 M{sub Sun} stars through the end of core He burning, the onset of He thermal pulses, and arrival on the white dwarf cooling sequence. We implement diffusion of angular momentum and chemical abundances that enable calculations of rotating-star models, which we compare thoroughly with earlier work. We introduce a new treatment of radiation-dominated envelopes that allows the uninterrupted evolution of massive stars to core collapse. This enables the generation of new sets of supernovae, long gamma-ray burst, and pair-instability progenitor models. We substantially modify the way in which MESA star solves the fully coupled stellar structure and composition equations, and we show how this has improved the scaling of MESA's calculational speed on multi-core processors. Updates to the modules for equation of state, opacity, nuclear reaction rates, and atmospheric boundary conditions are also provided. We describe the MESA Software Development Kit that packages all the required components needed to form a unified, maintained, and well-validated build environment for MESA. We also highlight a few tools developed by the community for rapid visualization of MESA star results.

Paxton, Bill; Cantiello, Matteo; Bildsten, Lars [Kavli Institute for Theoretical Physics, University of California, Santa Barbara, CA 93106 (United States); Arras, Phil [Department of Astronomy, University of Virginia, P.O. Box 400325, Charlottesville, VA 22904-4325 (United States); Brown, Edward F. [Department of Physics and Astronomy, National Superconducting Cyclotron Laboratory, and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, MI 48864 (United States); Dotter, Aaron [Research School of Astronomy and Astrophysics, The Australian National University, Weston, ACT 2611 (Australia); Mankovich, Christopher [Department of Physics, University of California, Santa Barbara, CA 93106 (United States); Montgomery, M. H. [Department of Astronomy and McDonald Observatory, University of Texas, Austin, TX 78712 (United States); Stello, Dennis [Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney, NSW 2006 (Australia); Timmes, F. X. [School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287 (United States); Townsend, Richard, E-mail: matteo@kitp.ucsb.edu [Department of Astronomy, University of Wisconsin-Madison, Madison, WI 53706 (United States)

2013-09-15

210

East Africa  

NASA Technical Reports Server (NTRS)

This image shows the East African nations of Ethiopia, Eritrea, and Somalia, as well as portions of Kenya, Sudan, Yemen, and Saudi Arabia. Dominating the scene are the green Ethiopian Highlands. With altitudes as high as 4,620 meters (15,157 feet), the highlands pull moisture from the arid air, resulting in relatively lush vegetation. In fact, coffee-one of the world's most prized crops-originated here. To the north (above) the highlands is Eritrea, which became independent in 1993. East (right) of Ethiopia is Somalia, jutting out into the Indian Ocean. The Sea-viewing Wide Field-of-view Sensor (SeaWiFS) captured this true-color image on November 29, 2000. Provided by the SeaWiFS Project, NASA/Goddard Space Flight Center, and ORBIMAGE

2002-01-01

211

Middle East  

SciTech Connect

Petroleum production in Middle East countries during 1980 totaled 6,747,719,000 bbl or an average rate of 18,436,390,000 bbl/d, down 13.9% from 1979. Increases were in Saudi Arabia and Syria. Significant decreases occurred in Iraq, Iran, Kuwait, and Turkey. New discoveries were made in Abu Dhabi, Iran, Saudi Arabia, Sharjah, and Oman. New areas were explored in Bahrain, Oman, Syria, and Yemen. 9 figures, 16 tables.

Hemer, D.O. (Mobil Oil Corp., New York, NY); Mason, J.F.; Hatch, G.C.

1981-10-01

212

Expansion of the geographic distribution of a novel lineage of ?-Proteobacteria to a hydrothermal vent site on the Southern East Pacific Rise  

Microsoft Academic Search

The diversity associated with a microbial mat sample collected from a deep-sea hydrothermal vent on the Southern East Pacific Rise was determined using a molecular phylogenetic approach based on the comparison of sequences from the small subunit ribosomal RNA gene (16S rDNA). The DNA was extracted from the sample and the 16S rDNA was amplified by PCR. Sixteen different phylotypes

Krista Longnecker; Anna-Louise Reysenbach

2001-01-01

213

Geology, geochronology, and geochemistry of basaltic flows of the Cat Hills, Cat Mesa, Wind Mesa, Cerro Verde, and Mesita Negra, central New Mexico  

USGS Publications Warehouse

The geochronology, geochemistry, and isotopic compositions of basaltic flows erupted from the Cat Hills, Cat Mesa, Wind Mesa, Cerro Verde, and Mesita Negra volcanic centres in central New Mexico indicate that each of these lavas had unique origins and that the predominant mantle involved in their production was an ocean-island basalt type. The basalts from Cat Hills (0.11 Ma) and Cat Mesa (3.0 Ma) are similar in major and trace element composition, but differences in MgO contents and Pb isotopic values are attributed to a small involvement of a lower crustal component in the genesis of the Cat Mesa rocks. The Cerro Verde rock is comparable in age (0.32 Ma) to the Cat Hills lavas, but it is more radiogenic in Sr and Nd, has higher MgO contents, and has a lower La/Yb ratio. This composition is explained by the melting of an enriched mantle source, but the involvement of another crustal component cannot be disregarded. The Wind Mesa rock is characterized by similar age (4.01 Ma) and MgO contents, but it has enriched rare-earth element contents compared with the Cat Mesa samples. These are attributed to a difference in the degree of partial melting of the Cat Mesa source. The Mesita Negra rock (8.11 Ma) has distinctive geochemical and isotopic compositions that suggest a different enriched mantle and that large amounts of a crustal component were involved in generating this magma. These data imply a temporal shift in magma source regions and crustal involvement, and have been previously proposed for Rio Grande rift lavas. ?? 2006 NRC Canada.

Maldonado, F.; Budahn, J.R.; Peters, L.; Unruh, D.M.

2006-01-01

214

Site Alias None Network of Conservation Areas (NCA) NCA Site ID NCA Site Name NCA Site Code - No Data Site Relations Contained in Pagosa Springs (S.USCOHP*27036)  

Microsoft Academic Search

The San Juan River is a major tributary to the Colorado River in the southwest United States, whose headwaters begin in Mineral and Archuleta counties in Colorado. Within the site, the river flows 7.5 miles generally north to south, passing through canyon, mesa and foothill topography in the south-central part of Archuleta County. Several miles below the site to the

2009-01-01

215

MESAFace, a graphical interface to analyze the MESA output  

NASA Astrophysics Data System (ADS)

MESA (Modules for Experiments in Stellar Astrophysics) has become very popular among astrophysicists as a powerful and reliable code to simulate stellar evolution. Analyzing the output data thoroughly may, however, present some challenges and be rather time-consuming. Here we describe MESAFace, a graphical and dynamical interface which provides an intuitive, efficient and quick way to analyze the MESA output. Catalogue identifier: AEOQ_v1_0 Program summary URL:http://cpc.cs.qub.ac.uk/summaries/AEOQ_v1_0.html Program obtainable from: CPC Program Library, Queen’s University, Belfast, N. Ireland Licensing provisions: Standard CPC licence, http://cpc.cs.qub.ac.uk/licence/licence.html No. of lines in distributed program, including test data, etc.: 19165 No. of bytes in distributed program, including test data, etc.: 6300592 Distribution format: tar.gz Programming language: Mathematica. Computer: Any computer capable of running Mathematica. Operating system: Any capable of running Mathematica. Tested on Linux, Mac, Windows XP, Windows 7. RAM: Recommended 2 Gigabytes or more. Supplementary material: Additional test data files are available. Classification: 1.7, 14. Nature of problem: Find a way to quickly and thoroughly analyze the output of a MESA run, including all the profiles, and have an efficient method to produce graphical representations of the data. Solution method: We created two scripts (to be run consecutively). The first one downloads all the data from a MESA run and organizes the profiles in order of age. All the files are saved as tables or arrays of tables which can then be accessed very quickly by Mathematica. The second script uses the Manipulate function to create a graphical interface which allows the user to choose what to plot from a set of menus and buttons. The information shown is updated in real time. The user can access very quickly all the data from the run under examination and visualize it with plots and tables. Unusual features: Moving the slides in certain regions may cause an error message. This happens when Mathematica is asked to read nonexistent data. The error message, however, disappears when the slides are moved back. This issue does not preclude the good functioning of the interface. Additional comments: The program uses the dynamical capabilities of Mathematica. When the program is opened, Mathematica prompts the user to “Enable Dynamics”. It is necessary to accept before proceeding. Running time: Depends on the size of the data downloaded, on where the data are stored (hard-drive or web), and on the speed of the computer or network connection. In general, downloading the data may take from a minute to several minutes. Loading directly from the web is slower. For example, downloading a 200 MB data folder (a total of 102 files) with a dual-core Intel laptop, P8700, 2 GB of RAM, at 2.53 GHz took about a minute from the hard-drive and about 23 min from the web (with a basic home wireless connection).

Giannotti, M.; Wise, M.; Mohammed, A.

2013-04-01

216

Groundwater, surface-water, and water-chemistry data, Black Mesa area, northeastern Arizona—2009–10  

USGS Publications Warehouse

The Navajo (N) aquifer is an extensive aquifer and the primary source of groundwater in the 5,400-square-mile Black Mesa area in northeastern Arizona. Availability of water is an important issue in northeastern Arizona because of continued water requirements for industrial and municipal use by a growing population and because of low precipitation in the arid climate of the Black Mesa area. Precipitation in the area is typically between 6 and 14 inches per year. The U.S. Geological Survey water-monitoring program in the Black Mesa area began in 1971 and provides information about the long-term effects of groundwater withdrawals from the N aquifer for industrial and municipal uses. This report presents results of data collected as part of the monitoring program in the Black Mesa area from January 2009 to September 2010. The monitoring program includes measurements of (1) groundwater withdrawals, (2) groundwater levels, (3) spring discharge, (4) surface-water discharge, and (5) groundwater chemistry. In 2009, total groundwater withdrawals were 4,230 acre-ft, industrial withdrawals were 1,390 acre-ft, and municipal withdrawals were 2,840 acre-ft. Total withdrawals during 2009 were about 42 percent less than total withdrawals in 2005 because of Peabody Western Coal Company's discontinued use of water in a coal slurry used for transporting coal. From 2008 to 2009 total withdrawals increased by 3 percent and industrial withdrawals increased by approximately 15 percent, but total municipal withdrawals decreased by 2 percent. From 2009 to 2010, annually measured water levels in the Black Mesa area declined in 7 of 16 wells that were available for comparison in the unconfined areas of the N aquifer, and the median change was 0.1 foot. Water levels declined in 12 of 18 wells measured in the confined area of the aquifer. The median change for the confined area of the aquifer was -0.3 foot. From the prestress period (prior to 1965) to 2010, the median water-level change for 34 wells in both the confined and unconfined area was -13.9 feet. Also, from the prestress period to 2009, the median water-level changes were -0.8 foot for 16 wells measured in the unconfined areas and -38.7 feet for 18 wells measured in the confined area. Spring flow was measured at four springs in 2010. Flow fluctuated during the period of record, but a decreasing trend was apparent at Moenkopi School Spring and Pasture Canyon Spring. Discharge at Burro Spring and Unnamed Spring near Dennehotso has remained relatively constant since they were first measured in the 1980s. Continuous records of surface-water discharge in the Black Mesa area were collected from streamflow-gaging stations at the following sites: Moenkopi Wash at Moenkopi 09401260 (1976 to 2009), Dinnebito Wash near Sand Springs 09401110 (1993 to 2009), Polacca Wash near Second Mesa 09400568 (1994 to 2009), and Pasture Canyon Springs 09401265 (2004 to 2009). Median winter flows (November through February) of each water year were used as an index of the amount of groundwater discharge at the above-named sites. For the period of record of each streamflow-gaging station, the median winter flows have generally remained constant, which suggests no change in groundwater discharge. In 2010, water samples collected from 11 wells and 4 springs in the Black Mesa area were analyzed for selected chemical constituents, and the results were compared with previous analyses. Concentrations of dissolved solids, chloride, and sulfate have varied at all 11 wells for the period of record, but neither increasing nor decreasing trends over time were found. Dissolved-solids, chloride, and sulfate concentrations increased at Moenkopi School Spring during the more than 12 years of record at that site. Concentrations of dissolved solids, chloride, and sulfate at Pasture Canyon Spring have not varied much since the early 1980s, and there is no increasing or decreasing trend in those data. Concentrations of dissolved solids, chloride, and sulfate at Burro Spring and Unnamed Spring near Dennehotso have varied for the period of

Macy, Jamie P.; Brown, Christopher R.

2011-01-01

217

Evolution of Lacustrine Environments on Mars and Their Significance: The Case for the Brazos Lakes and East Terra Meridiani Basins as Landing Sites for Surveyor 2001  

NASA Technical Reports Server (NTRS)

Ancient Martian lacustrine environments must be considered as primary targets to explore on Mars. Terrestrial studies show that lakes are exceptional sites to keep the record of the evolution of climate, geology, water and life. Finding this record is also the principal objective of the Mars Surveyor Program. This record encompasses changes at local, regional and global scales. Lacustrine sediments provide critical information about all events occurring in the lake catchment area. They are also a locus of complex chemical processes, concentration for life and favorable sites for fossilization processes to take place. We proposed two candidate-sites in the Schiaparelli Crater region responding to this high-priority scientific objective at the June 1999 meeting in Buffalo, NY. The two sites are located in the Sinus Sabeus quadrangle, are well documented by MOC images, and are among the best evidence yet of a Martian past lacustrine activity. We develop their case as high-priority sites for the 01' mission.

Cabrol, N. A.; Grin, E. A.

1999-01-01

218

40 CFR 81.173 - Grand Mesa Intrastate Air Quality Control Region.  

...1857h(f) geographically located within the outermost boundaries of the area so delimited): In the State of Colorado: Delta County, Eagle County, Garfield County, Gunnison County, Hinsdale County, Mesa County, Montrose County, Ouray County,...

2014-07-01

219

40 CFR 81.173 - Grand Mesa Intrastate Air Quality Control Region.  

Code of Federal Regulations, 2013 CFR

...1857h(f) geographically located within the outermost boundaries of the area so delimited): In the State of Colorado: Delta County, Eagle County, Garfield County, Gunnison County, Hinsdale County, Mesa County, Montrose County, Ouray County,...

2013-07-01

220

40 CFR 81.173 - Grand Mesa Intrastate Air Quality Control Region.  

Code of Federal Regulations, 2011 CFR

...1857h(f) geographically located within the outermost boundaries of the area so delimited): In the State of Colorado: Delta County, Eagle County, Garfield County, Gunnison County, Hinsdale County, Mesa County, Montrose County, Ouray County,...

2011-07-01

221

78 FR 46312 - Spruce Beetle Epidemic and Aspen Decline Management Response; Grand Mesa, Uncompahgre and...  

Federal Register 2010, 2011, 2012, 2013

...DEPARTMENT OF AGRICULTURE Forest Service Spruce Beetle Epidemic and Aspen Decline...Grand Mesa, Uncompahgre and Gunnison National Forests (GMUG), Colorado AGENCY: Forest Service, USDA. ACTION: Notice of intent...

2013-07-31

222

Overview of the Multiscale Epidemiologic/Economic Simulation and Analysis (MESA) Decision Support System  

SciTech Connect

The Multiscale Epidemiologic/Economic Simulation and Analysis (MESA) Decision Support System (DSS) is the product of investments that began in FY05 by the Department of Homeland Security (DHS) Science and Technology Directorate and continue today with joint funding by both DHS and the US Department of Agriculture (USDA). The DSS consists of a coupled epidemiologic/economic model, a standalone graphical user interface (GUI) that supports both model setup and post-analysis, and a Scenario Bank archive to store all content related to foreign animal disease (FAD) studies. The MESA epi model is an object-oriented, agent-based, stochastic, spatio-temporal simulator that parametrically models FAD outbreaks and response strategies from initial disease introduction to conclusion over local, regional, and national scales. Through its output database, the epi model couples to an economic model that calculates farm-level impacts from animal infections, responsive control strategies and loss of trade. The MESA architecture contains a variety of internal models that implement the major components of the epi simulation, including disease introduction, intra-herd spread, inter-herd spread (direct and indirect), detection, and various control strategies (movement restrictions, culling, vaccination) in a highly configurable and extensible fashion. MESA development was originally focused to support investigations into the economic and agricultural industry impacts associated with Foot-and-Mouth Disease (FMD outbreaks). However, it has been adapted to other FADs such has Highly Pathogenic Avian Influenza (HPAI), Classical Swine Fever (CSF) and Exotic Newcastle Disease (END). The MESA model is highly parameterized and employs an extensible architecture that permits straightforward addition of new component models (e.g., alternative disease spread approaches) when necessary. Since its inception, MESA has been developed with a requirement to enable simulation of the very large scale, nationwide disease outbreaks that are of special interest to DHS. MESA has been developed at Lawrence Livermore National Laboratory (LLNL) and has benefited from the world-class experience in supercomputing application development held by LLNL staff as well as the best-in-class high performance computing infrastructure in place at LLNL. MESA incorporates novel architectural features that permit it to make efficient use of available compute cycles by dynamically increasing the fidelity of the simulation in spatial (geopolitical) regions where relevant activity is occurring and keeping other regions aggregated into a computationally simpler representation. In addition to the MESA epi and economic models, the MESA DSS incorporates other key components. Integral to the parametric approach MESA employs to setup and define disease outbreak scenarios is a GUI that enables the MESA user to efficiently manage the thousands of parameters required by the simulator. The GUI provides individual parameter editors for groups of variables that support a common high level function, such as disease introduction, spread, control strategies, etc. It also provides a capability to browse through multiple study projects and develop n-additional outbreak scenarios per project through successive refinement of existing scenarios. Finally, the MESA GUI links post-processing applications that permit extraction of key data from MESA raw output, generation of spreadsheets, and geospatial mapping of simulation results. The MESA GUI is a standalone application that normally runs on the user's desktop, although its Java source code is portable and can execute under virtually any modern operating system. The final major component of the MESA DSS is the Scenario Bank, which is a web-served archive of unclassified FAD study content. The Scenario Bank implements a hierarchy of spaces, structured primarily along organizational lines (e.g., 'USDA', 'LLNL', etc), that permits participants to store simulator inputs, outputs, analysis results, reports, etc. and explicitly control who among Bank users may

Speck, D E

2008-04-28

223

Mesa Verde Pueblo IIIMesa Verde Pueblo III AD 1150 to 1300  

E-print Network

of investment in the Mesa Verde region www.nps.gov · In the context of another drought ­ Technological protective ­ Inaccessible · PII, mesatop, open villages on prime farmland #12;PII, Albert PorterPII, Albert

Wolverton, Steve

224

Formation of Step-Free Surfaces on Diamond (111) Mesas by Homoepitaxial Lateral Growth  

NASA Astrophysics Data System (ADS)

We present a technique for the array formation of atomically step-free diamond surfaces on diamond (111) substrates by microwave plasma-enhanced chemical vapor deposition. With an appropriate choice of plasma conditions, the atomic steps initially present on each mesa surface move by lateral growth, and then, atomically step-free surfaces are successfully formed on diamond (111) mesas by microwave plasma-enhanced chemical vapor deposition. The lateral growth of diamond (111) films results in the formation of step-free surfaces with device dimensions up to 100 µm square on diamond (111) mesas. A limiting factor in scaling up the size and yield of the step-free mesas is the density of screw dislocations in the diamond substrate.

Tokuda, Norio; Makino, Toshiharu; Inokuma, Takao; Yamasaki, Satoshi

2012-09-01

225

77 FR 2242 - Radio Broadcasting Services; Ehrenberg, First Mesa, Kachina Village, Wickenburg, and Williams, AZ...  

Federal Register 2010, 2011, 2012, 2013

...Ehrenberg, First Mesa, Kachina Village, Wickenburg, and Williams, AZ, and Needles, CA AGENCY: Federal Communications Commission...DC 20554. FOR FURTHER INFORMATION CONTACT: Rolanda F. Smith or Andrew J. Rhodes, Media Bureau, (202)...

2012-01-17

226

Ground-Water, Surface-Water, and Water-Chemistry Data, Black Mesa Area, Northeastern Arizona-2005-06  

USGS Publications Warehouse

The N aquifer is the major source of water in the 5,400 square-mile Black Mesa area in northeastern Arizona. Availability of water is an important issue in northeastern Arizona because of continued water requirements for industrial and municipal use and the needs of a growing population. Precipitation in the Black Mesa area averages about 6 to 14 inches per year. The water monitoring program in the Black Mesa area began in 1971 and is designed to provide information about the long-term effects of ground-water withdrawals from the N aquifer for industrial and municipal uses. This report presents results of data collected for the monitoring program in the Black Mesa area from January 2005 to September 2006. The monitoring program includes measurements of (1) ground-water pumping, (2) ground-water levels, (3) spring discharge, (4) surface-water discharge, (5) ground-water chemistry, and (6) periodic testing of ground-water withdrawal meters. In 2005, ground-water withdrawals in the Black Mesa area totaled 7,330 acre-feet, including ground-water withdrawals for industrial (4,480 acre-feet) and municipal (2,850 acre-feet) uses. From 2004 to 2005, total withdrawals increased by less than 2 percent, industrial withdrawals increased by approximately 3 percent, and total municipal withdrawals increased by 0.35 percent. From 2005 to 2006, annually measured water levels in the Black Mesa area declined in 10 of 13 wells in the unconfined areas of the N aquifer, and the median change was -0.5 foot. Measurements indicated that water levels declined in 12 of 15 wells in the confined area of the aquifer, and the median change was -1.4 feet. From the prestress period (prior to 1965) to 2006, the median water-level change for 29 wells was -8.5 feet. Median water-level changes were -0.2 foot for 13 wells in the unconfined areas and -46.6 feet for 16 wells in the confined area. Ground-water discharges were measured once in 2005 and once in 2006 at Moenkopi School Spring and Burro Spring. Discharge decreased by 3.5 percent at Moenkopi School Spring and by 15 percent at Burro Spring. During the period of record at each spring, discharges fluctuated; a decreasing trend was apparent. Continuous records of surface-water discharge in the Black Mesa area have been collected from streamflow gages at the following sites: Moenkopi Wash (1976 to 2005), Dinnebito Wash (1993 to 2005), Polacca Wash (1994 to 2005), Pasture Canyon Spring (August 2004 to December 2005), and Laguna Creek (1996 to 2005). Median flows during November, December, January, and February of each water year were used as an index of the amount of ground-water discharge to the above named sites. For the period of record at each streamflow-gaging station, the median winter flows have decreased for Moenkopi Wash, Dinnebito Wash, and Polacca Wash. There is not a long enough period of record for Pasture Canyon Spring and Laguna Creek was discontinued at the end of December 2005. In 2006, water samples were collected from 6 wells and 2 springs in the Black Mesa area and analyzed for selected chemical constituents. Dissolved-solids concentrations ranged from 111 to 588 milligrams per liter. Water samples from 5 of the wells and both of the springs had less than 500 milligrams per liter of dissolved solids. Trends in the chemistry of water samples from the 6 wells show the Pi?on NTUA 1 and Peabody 9 wells increasing in dissolved solids, Forest Lake NTUA 1 and Peabody 2 wells decreasing in dissolved solids, and Kykotsmovi PM2 and Keams Canyon PM2 wells show a steady trend. Increasing trends in dissolved-solids, chloride, and sulfate concentrations were evident from the more than 11 years of data for the 2 springs.

Truini, Margot; Macy, J.P.

2007-01-01

227

Nest-Site Characteristics of Red-bellied and Red-headed Woodpeckers and Northern Flickers in East-Central Ohio1  

Microsoft Academic Search

ABSTRACT. In order to understand more ,clearly what factors limit the reproductive success of primary cavity-nesting birds, it is important to examine and compare the nest-site characteristics of sympatric species in a variety of forest and woodland,habitats. To add to the data already available on various woodpecker species in eastern and central North America, several nest-site and habitat characteristics were

Danny J. Ingold

228

Factors Controlling Pre-Columbian and Early Historic Maize Productivity in the American Southwest, Part 2: The Chaco Halo, Mesa Verde, Pajarito Plateau/Bandelier, and Zuni Archaeological Regions  

USGS Publications Warehouse

Chemical and nutrient analyses of 471 soil samples from 161 sites within four archaeological regions (Pajarito Plateau/Bandelier, Zuni, Mesa Verde, and the Chaco Halo) were combined with historical climate data in order to evaluate the agricultural productivity of each region. In addition, maize productivity and field-life calculations were performed using organic-nitrogen (N) values from the upper 50 cm of soil in each region and a range (1-3%/year) of N-mineralization rates. The endmember values of this range were assumed representative of dry and wet climate states. With respect to precipitation and heat, the Pajarito Plateau area has excellent agricultural potential; the agricultural potentials of the Zuni and Mesa Verde regions are good; and the agricultural potential of the Chaco Halo is poor. Calculations of N mineralization and field life indicate that Morfield Valley in Mesa Verde should be able to provide 10 bu/ac of maize for decades (without the addition of N) when organic N-mineralization rates exceed 2%. Productivity and field-life potential decrease in the following order: Zuni, Mesa Verde, Bandelier, Chaco Halo. The Chaco Halo is very unproductive; e. g., 10 bushels per acre can be achieved within the Halo only from soils having the highest organic N concentration (third quartile) and which undergo the highest rate (3%) of N mineralization. ?? 2010 US Government.

Benson, L.V.

2011-01-01

229

Analysis of tracer responses in the BULLION Forced-Gradient Experiment at Pahute Mesa, Nevada  

SciTech Connect

This report presents an analysis of the tracer data from the BULLION forced-gradient experiment (FGE) conducted on Pahute Mesa at the Nevada Test Site from June 2, 1997 through August 28, 1997, for the Underground Test Area (UGTA) Program. It also serves to document the polystyrene microsphere data from the FGE. The FGE involved the injection of solute and colloid tracers into wells ER-20-6 No. 1 and ER-20-6 No. 2 while ER-20-6 No. 3 was pumped at approximately 116 gallons per minute (gpm). The experimental configuration and test design are described briefly in this report; more details are provided elsewhere (IT, 1996, 1997, 1998). The tracer responses in the various wells yielded valuable information about transport processes such as longitudinal dispersion, matrix diffusion and colloid transport in the hydrogeologic system in the vicinity of the BULLION nuclear test cavity. Parameter values describing these processes are derived from the semi-analytical model interpretations presented in this report. A companion report (IT, 1998) presents more detailed numerical modeling interpretations of the solute tracer responses.

Paul W. Reimus; Marc J. Haga

1999-10-01

230

The Council on East Asian Libraries (CEAL)  

NSDL National Science Digital Library

The Council on East Asian Libraries maintains a page directed to the needs of librarians who must deal with the growing volume of Asian electronic information and should be useful for anyone interested in East Asia or in Asian studies. The site includes pointers to specific resources, such as the largest internet site for Chinese software, and links grouped by area: Japan, China, Taiwan, Hong Kong, Macau, South Korea, North Korea, and the Asia/Pacific Basin.

1997-01-01

231

Mesa-sidewall gate leakage in InAlAs\\/InGaAs heterostructure field-effect transistors  

Microsoft Academic Search

InAlAs\\/InGaAs HFETs fabricated by conventional mesa isolation have a potential parasitic gate-leakage path where the gate metallization overlaps the exposed channel edge at the mesa sidewall. The existence of this path has been proven by fabricating special heterojunction diodes with different mesa-sidewall gate-metal overlap lengths. It is found that sidewall leakage is a function of the crystallographic orientation of the

Sandeep R. Bahl; Michael H. Leary; Jesds A. del Alamo

1992-01-01

232

Site use by dark-bellied brent geese Branta bernicla bernicla on the Russian tundra as recorded by satellite telemetry: implications for East Atlantic flyway conservation  

Microsoft Academic Search

In 1999, seven dark-bellied brent geese Branta bemicla bemicla were followed during spring migration from western Europe to Arctic Russia using satellite telemetry. For six of the birds we were also able to monitor their summer stay at the Taimyr Peninsula, and for five birds part of their autumn migration was recorded. In this article, we report on site use

Martin Green; Thomas Alerstam; Preben Clausen; Rudi Drent; Barwolt S. Ebbinge

2002-01-01

233

Mobilization of actinides by dissolved organic compounds at the Nevada Test Site  

Microsoft Academic Search

The effect of dissolved organic matter (DOM) on Am(III), Pu(IV), Np(V), and U(VI) sorption was investigated with natural water (pH ?8) and zeolitized tuff samples collected from the Rainier Mesa tunnel system, Nevada Test Site, where the USA detonated underground nuclear tests prior to 1992. Perched vadose zone water at Rainier Mesa has high levels of DOM as a result

Pihong Zhao; Mavrik Zavarin; Roald N. Leif; Brian A. Powell; Michael J. Singleton; Rachel E. Lindvall; Annie B. Kersting

2011-01-01

234

Eruptive vents for the Burro Mesa Rhyolite, Big Bend National Park, Trans-Pecos Texas  

SciTech Connect

Detailed mapping of field relations and flow direction of the Burro Mesa Rhyolite (BMR) have identified vent localities at Burro Mesa, Kit Mountain, Cerro Castellan, Trap Mountain, and Goat Mountain, and the suggest the presence of additional, as yet unlocated, centers of eruption. This work confirms recent interpretations that BMR rocks were not erupted from the Pine Canyon caldera, but were instead erupted from isolated feeder localities in the Burro Mesa-Cerro Castellan area. At the Burro Mesa locality, the BMR contains a lower sparsely-porphyritic lava, a central porphyritic ash-flow tuff, and an upper abundantly-porphyritic lava. At all other mapped localities, only sparsely-porphyritic lava and Wasp Springs Flow Breccia (WSFB) are present. Two vents at Burro Mesa represent sources for separate BMR flows, as well as WSFB, which consists of numerous surge deposits with interbedded ash-flow tuff. Flow directional data suggests a third unlocated vent for abundantly-porphyritic lava in the SE region of Burro Mesa. Flow direction data also suggest that the SW end of Kit Mountain was a source for sparsely-porphyritic lava. A feeder dike at Cerro Castellan cuts up through the WSFB, flaring near the top into a volcanic dome of sparsely-porphyritic lava at the top of the mountain. This cross-cutting relationship was present at most vent localities. Mapping and flow direction data of BMR from vents and other localities suggest that the BMR consists of a discontinuous belt of individual domes, which trend in a southwesterly direction from Burro Mesa to Cerro Castellan.

Holt, G.S.; Parker, D.F. (Baylor Univ., Waco, TX (United States). Dept. of Geology)

1993-02-01

235

4. East elevation, facing west (Note: B/W scale on east ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. East elevation, facing west (Note: B/W scale on east elevation in 1/2 ft increments) - Nevada Test Site, Reactor Maintenance & Disassembly Complex, Junior Hot Cell, Jackass Flats, Area 25, South of intersection of Roads F & G, Mercury, Nye County, NV

236

Core lithologies and their constraints on gas-hydrate occurrence in the East Sea, offshore Korea: Results from the site UBGH1-9  

Microsoft Academic Search

Drilling at the site UBGH1-9, offshore Korea in 2007, revealed varied gas-hydrate saturation with depth and a wide variety of core litholgies, demonstrating how the variations in the lithology are linked with those in gas-hydrate saturation and morphology. Discrete excursions to low chlorinity values from in situ background chlorinity level occur between 63 and 151 mbsf. In this occurrence zone, gas-hydrate

Jang-Jun Bahk; In-Kwon Um; Melanie Holland

2011-01-01

237

M.E.S.A, not Just a Seat at the Table: a Chicano Geology Student's Experience with Investigative Field Research  

NASA Astrophysics Data System (ADS)

The MESA (math, engineering, science achievement) program in California engages educationally disadvantaged students, primarily minority groups, providing the opportunity to excel in math and science and graduate with math-based degrees. MESA at East Los Angeles Community College selected me, a returning 24 year-old Chicano student, for the SCEC (Southern California Earthquake Center) summer internship at Utah State University (USU). The project coordinators assigned me to a group with three other undergraduate geology students from across the continent and from a variety of socioeconomic backgrounds to investigate geothermal systems in the Salton Trough and northern Utah. The peer-driven field work transformed student to investigator by forcing each participant to be responsible for the success of the entire group. In this environment, I rose to expectations along with my fellow interns managing a detailed field notebook, sampling, planning routes, level logger maintenance, and x-ray diffractometer analysis interpretation, among other things. Mentorship from and challenges proposed by the USU project advisor further built on this scaffolding of field experience. First hand fieldwork provides a battery of beneficial skills that many undergraduate geology students, especially at the two- year college level, rarely get an opportunity to participate in. The advantage of including non-traditional students from two- year colleges allows for a dynamic research network nationwide. Key sample collection by the East Los Angeles College (ELAC) Geology Club, a student- run club at an inner city community college, facilitated ongoing examination by collecting mud samples from gryphons and mudpots in the Salton Trough and testing temperature, pH levels, electrical conductivity, and total dissolved solids in the field. The samples were sent back to students at USU for further analysis. This collaborative effort is symbiotic as sharing the sampling responsibility allowed USU to save funds and provided ELAC students with the opportunity to gain field- sampling experience. The collaboration that took place allowed community college students to gain confidence in new sampling skills, and students based out of Utah to continue an ongoing study. By sharing the opportunity to conduct fieldwork more students are able to engage in the learning process and contribute to scientific discovery. This feeling of contribution is extremely important to the retention of students in the geosciences. Ultimately, thanks to MESA, this Chicano geology-major gained the confidence and background knowledge necessary to ask critical questions and understand complex concepts that will be the basis for the successful completion of a least a Bachelor of Science degree in geology, and the pursuit of further education.

Ponce-Zepeda, M. M.

2011-12-01

238

Phytoremediation of Pb, Zn, Fe, and Mg with 25 wetland plant species from a paper mill contaminated site in North East India.  

PubMed

In order to assess the potential of wetland plants to remediate metals from a paper mill effluent contaminated wetland site in Northeast India, 25 abundant plant species belonging to 15 different families, soil, and water samples from the sites were tested for Pb, Zn, Mg, and Fe by atomic absorption spectrophotometer. The results showed that metal accumulation by wetland plants differed among species and tissues. Plants thrived in high Pb, Zn, Mg, and Fe which indicated their tolerance. According to the criteria used for selecting plants for phytoremediation such as high metal tolerance, short life cycle, wide distribution, large shoot biomass and translocation factor (TF) >1; five species each were Mg and Fe accumulators, nine species were Pb accumulators and, eight species were Zn accumulators and the rest were excluders. Alternanthera sessilis was the only plant species that had TF?>?1 for all the four metals. The study indicated great promise for phytoremediation, as these accumulators could be used in future for practical phytoremediation approaches and reduction of the risk from harmful metals to human health. PMID:25103945

Mazumdar, Kisholay; Das, Suchismita

2015-01-01

239

Name E-Mail Office Phone Fee Tutoring Mesa, Camilo camilo.mesa@colorado.edu Math 312 303-815-6949 $30/hr H.S. and all undergraduate except Math 1300  

E-print Network

Name E-Mail Office Phone Fee Tutoring Mesa, Camilo camilo.mesa@colorado.edu Math 312 303-815-6949 $30/hr H.S. and all undergraduate except Math 1300 Andrews, Scott scott.andrews@colorado.edu Math 362 978-460-3347 $40/hr H.S. and All Undergrad except Math 1300 Migler, Joseph joseph

Stowell, Michael

240

Mountainous Ecosystem Sensor Array (MESA): a mesh sensor network for climate change research in remote mountainous environments  

NASA Astrophysics Data System (ADS)

Developing sensor networks robust enough to perform unattended in the world's remote regions is critical since these regions serve as important benchmarks that lack anthropogenic influence. Paradoxically, the factors that make these remote, natural sites challenging for sensor networking are often what make them indispensable for climate change research. The MESA (Mountainous Ecosystem Sensor Array) project has faced these challenges and developed a wireless mesh sensor network across a 660 m topoclimatic gradient in a wilderness area in central Idaho. This sensor array uses advances in sensing, networking, and power supply technologies to provide near real-time synchronized data covering a suite of biophysical parameters used in ecosystem process models. The 76 sensors in the network monitor atmospheric carbon dioxide concentration, humidity, air and soil temperature, soil water content, precipitation, incoming and outgoing shortwave and longwave radiation, snow depth, wind speed and direction, and leaf wetness at synchronized time intervals ranging from two minutes to two hours and spatial scales from a few meters to two kilometers. We present our novel methods of placing sensors and network nodes above, below, and throughout the forest canopy without using meteorological towers. In addition, we explain our decision to use different forms of power (wind and solar) and the equipment we use to control and integrate power harvesting. Further, we describe our use of the network to sense and quantify its own power use. Using examples of environmental data from the project, we discuss how these data may be used to increase our understanding of the effects of climate change on ecosystem processes in mountainous environments. MESA sensor locations across a 700 m topoclimatic gradient at the University of Idaho Taylor Wilderness Research Station.

Robinson, P. W.; Neal, D.; Frome, D.; Kavanagh, K.; Davis, A.; Gessler, P. E.; Hess, H.; Holden, Z. A.; Link, T. E.; Newingham, B. A.; Smith, A. M.

2013-12-01

241

Women Now Nearly Half of San Diego Mesa Community College's Geographic Information Systems (GIS) Program  

NSDL National Science Digital Library

This brief case study highlights San Diego's Mesa Community College's Geographic Information Systems program, and the strategies that program has adopted to recruit and retain female students. The program took part in the CalWomen Tech Project, which was a collaborative effort by several colleges to increase enrollment of female students in technical areas of study. Some of the strategies that worked for Mesa Community College are outlined here, including: -Identifying female role models in GIS and taking their photos for marketing collateral to be developed by IWITTS and:-Distributing recruitment posters, flyers, brochures and a CalWomenTech College Website section featuring female role models.This narrative, and the lessons that can be learned from the success of Mesa Community College in this area, would be useful for other community college and technical programs looking to increase their numbers of female students.

242

Botanical prospecting for uranium on La Ventana Mesa, Sandoval County, New Mexico  

USGS Publications Warehouse

A botanical sampling program has been completed by the U.S. Geological Survey on La Ventana Mesa, Sandoval County, N. Mex. A uranium-bearing coal in the Allison-Gibson members of the Cretaceous Mesaverde formation crops out in erosional remnants of the mesa.The coal is capped by a well-fractured 65-foot sandstone bed through which roots of a pinyon-juniper forest penetrate. Samples of several hundred branches of trees growing on top of the mesa were collected and analyzed for uranium. The assays ranged from 0.1 part per million to 2.3 ppm uranium in the wood ash. Dead branches, which were found to contain more uranium in the ash than live branches, were sampled where possible. The results have been contoured to indicated probable areas of mineralized coal. Parts of the north butte are recommended as favorable for physical exploration.

Starrett, Wm. H.; Cannon, Helen L.

1954-01-01

243

77 FR 40354 - Mesa de Los Carros Hydro, LLC; Notice of Preliminary Permit Application Accepted for Filing and...  

Federal Register 2010, 2011, 2012, 2013

...No. 13316-001] Mesa de Los Carros Hydro, LLC; Notice of Preliminary Permit...On April 3, 2012, Mesa De Los Carros Hydro, LLC filed an application, pursuant to section 4(f) of the Federal Power Act (FPA), proposing to study...

2012-07-09

244

Effect of dissolution of volcanic glass on the water chemistry in a tuffaceous aquifer, Rainier Mesa, Nevada  

Microsoft Academic Search

Geochemistry of ground water associated with the Tertiary tuffs with in Rainier Mesa, southern Nevada, was investigated to determine the relative importance of glass dissolution in controlling water chemistry. Water samples were obtained both from interstitial pores in core sections and from free-flowing fractures. Cation compositions showed that calcium and magnesium decreased as a function of depth in the mesa,

A. F. White; H. C. Claassen; L. V. Benson

1980-01-01

245

Felsic segregation during crystallization of a subaqueous lava field (ODP-IODP Site 1256, East Pacific Rise): Inferences from structure and petrography  

NASA Astrophysics Data System (ADS)

Massive basalt flows have been mainly observed and studied in subaerial environments, but data collected during sonar surveys and drilling cruises in ocean highlighted that thick lava fields (up to 70 m in thickness) are widespread in the oceanic crust produced along fast spreading ridges. Most of the thickest lava flows include felsic differentiates consisting of Na-plagioclase + quartz. Drilling at ODP-IODP Site 1256 encountered a > 30 m and > 70 m-tick massive lava flow near the top of the basement in Holes 1256C and D respectively. Rare (1 to 3%) late magmatic veins (LMVs) and late magmatic domains (LMDs) of felsic material occur within this very thick lava flow. LMVs and LMDs occur in a range of different orientations, attitudes and textures and cut the basalt magmatic assemblage inducing a deformation ranging from brittle to ductile. Fine-scale structural, microstructural, and petrographic analyses from the giant lava flow suggest that segregation and migration of felsic melt through host basalt were strictly related to the cooling and crystallization of the lava flow, which represents a single stage magmatic event.

Panseri, Matteo; Tartarotti, Paola; Crispini, Laura

2010-09-01

246

The Colorado MESA Program and CU-LASP: A Model for After School Program/Research Institution Collaboratives  

NASA Astrophysics Data System (ADS)

Colorado MESA is an after school program operating throughout the state with a long track record in promoting science, math and engineering education to largely underserved K-12 student populations. Currently, 81 percent of MESA students are from groups underrepresented in the math/science careers, and 85 percent of MESA students come from low- and moderate-income families. Through a combination of weekly student programs, field trips to universities and industry partners, family orientations, individual academic counseling and required curriculum, Colorado MESA offers an opportunity for students to explore STEM subjects and careers that they might not otherwise have access to - with tangible results. In the Colorado MESA Class of 2003, 97 percent of students planned on entering college this fall, with 86 percent indicating that they will enroll in math/science-based majors. In the last year, the University of Colorado's Laboratory for Atmospheric and Space Physics, a large space and earth sciences institute, has relied on the Colorado MESA program as its primary K-12 partner in Education and Public Outreach. LASP incorporates MESA into its proposal writing opportunities, from E/PO additions to individual research proposals to mission-level educational programs. In addition to funding opportunities, LASP provides scientists and engineers in a variety of contexts and content areas, while MESA works to incorporate those resources into their after school programs. The interface between the after school programs and the research institution requires ongoing communication and coordination in order to evaluate and fine-tune curriculum and activities based on feedback from MESA advisors and teachers. Currently, the MESA/LASP partnership has funded programs in astrobiology, planetary sciences and engineering.

Nelson, G.; Cobabe-Ammann, E.

2004-12-01

247

Seasonal variations of stable carbon isotopic composition of bulk aerosol carbon from Gosan site, Jeju Island in the East China Sea  

NASA Astrophysics Data System (ADS)

This study explores the usefulness of stable isotopic composition (?13C) along with other chemical tracers and air mass trajectory to identify the primary and secondary sources of carbonaceous aerosols. Aerosol samples (n = 84) were collected continuously from April 2003 to April 2004 at Gosan site in Jeju Island, South Korea. The concentrations of total carbon (TC), HCl fumed carbonate-free total carbon (fumed-TC) and their ?13C were measured online using elemental analyzer interfaced to isotope ratio mass spectrometer (EA-IRMS). Similar concentrations of TC and fumed-TC and their similar ?13C values suggest the insignificant contribution of inorganic carbon to Gosan aerosols. The monthly averaged ?13CTC showed the lowest in April/May (-24.2 to -24.4‰), which is related with the highest concentrations of oxalic acid (a secondary tracer). The result indicates an enhanced contribution of TC from secondary sources. The monthly averaged ?13CTC in July/August (-23.0 to -22.5‰) were similar to those in January/February (-23.1‰ to -22.7‰). However, chemical tracers and air mass transport pattern suggest that the pollution source regions in January/February are completely different from those in July/August. Higher ?13C values in July/August are aligned with higher concentration ratios of marine tracers (azelaic acid/TC and methanesulfonate/TC), suggesting an enhanced contribution of marine organic matter to the aerosol loading. Higher ?13C values in January/February are associated with higher concentrations of phthalic acid and K+/TC, indicating more contributions of carbonaceous aerosols from fossil fuel and C4-plant biomass combustion. This study demonstrates that ?13CTC, along with other chemical tracers and air mass trajectory, can be used as a tracer to understand the importance of primary versus secondary pollution sources of carbonaceous aerosols in the atmosphere.

Kundu, Shuvashish; Kawamura, Kimitaka

2014-09-01

248

The Confluence of Gangis and Eos Chasmas (5-12 deg S, 31-41 deg W): Geologic, Hydrologic, and Exobiologic Considerations for Landing Site at the East End of Valles Marineris  

NASA Astrophysics Data System (ADS)

Over its 3,500 km length, Valles Marineris exhibits an enormous range of geologic and environmental diversity. At its western end, the canyon is dominated by the tectonic complex of Noctis Labyrinthus; while in the east it grades into an extensive region of chaos where scoured channels and streamlined islands provide evidence of catastrophic floods that spilled into the northern plains. In the central portion of the system, debris derived from the massive interior layered deposits of Candor and Ophir Chasmas spills into the central trough. In other areas, 6 km-deep exposures of Hesperian and Noachian-age canyon wall stratigraphy have collapsed in massive landslides that extend many tens of kilometers across the canyon floor. Ejecta from interior craters, aeolian sediments, and possible volcanics emanating from structurally controlled vents along the base of the scarps, further contribute to the canyon's geologic complexity. Following the initial rifting that gave birth to Valles Marineris, water appears to have been a principal agent in the canyon's geomorphic development an agent whose significance is given added weight by its potential role in both sustaining and preserving evidence of past life. In this regard, the interior layered deposits of Candor, Ophir, and Hebes Chasmas, have been identified as possible lucustrine sediments that may have been laid down in long-standing ice-covered lakes. The potential survival and growth of native organisms in such an environment, or in the aquifers whose disruption gave birth to the chaotic terrain and outflow channels to the north and east of the canyon, raises the possibility that fossil indicators of life may be present in the local sediment and rock. Because of the enormous distances over which these diverse environments occur, identifying a single landing site that maximizes the opportunity for scientific return is not a simple task. However, given the fluvial history and narrow geometry of the canyon, the presence of a single exit at its eastern end provides an opportunity for sampling that appears unequaled elsewhere in the system.

George, J. A.; Clifford, S. M.

1999-06-01

249

The Confluence of Gangis and Eos Chasmas (5-12 deg S, 31-41 deg W): Geologic, Hydrologic, and Exobiologic Considerations for Landing Site at the East End of Valles Marineris  

NASA Technical Reports Server (NTRS)

Over its 3,500 km length, Valles Marineris exhibits an enormous range of geologic and environmental diversity. At its western end, the canyon is dominated by the tectonic complex of Noctis Labyrinthus; while in the east it grades into an extensive region of chaos where scoured channels and streamlined islands provide evidence of catastrophic floods that spilled into the northern plains. In the central portion of the system, debris derived from the massive interior layered deposits of Candor and Ophir Chasmas spills into the central trough. In other areas, 6 km-deep exposures of Hesperian and Noachian-age canyon wall stratigraphy have collapsed in massive landslides that extend many tens of kilometers across the canyon floor. Ejecta from interior craters, aeolian sediments, and possible volcanics emanating from structurally controlled vents along the base of the scarps, further contribute to the canyon's geologic complexity. Following the initial rifting that gave birth to Valles Marineris, water appears to have been a principal agent in the canyon's geomorphic development an agent whose significance is given added weight by its potential role in both sustaining and preserving evidence of past life. In this regard, the interior layered deposits of Candor, Ophir, and Hebes Chasmas, have been identified as possible lucustrine sediments that may have been laid down in long-standing ice-covered lakes. The potential survival and growth of native organisms in such an environment, or in the aquifers whose disruption gave birth to the chaotic terrain and outflow channels to the north and east of the canyon, raises the possibility that fossil indicators of life may be present in the local sediment and rock. Because of the enormous distances over which these diverse environments occur, identifying a single landing site that maximizes the opportunity for scientific return is not a simple task. However, given the fluvial history and narrow geometry of the canyon, the presence of a single exit at its eastern end provides an opportunity for sampling that appears unequaled elsewhere in the system.

George, J. A.; Clifford, S. M.

1999-01-01

250

Geological site characterization for the proposed Mixed Waste Disposal Facility, Los Alamos National Laboratory  

SciTech Connect

This report presents the results of geological site characterization studies conducted from 1992 to 1994 on Pajarito Mesa for a proposed Los Alamos National Laboratory Mixed Waste Disposal Facility (MWDF). The MWDF is being designed to receive mixed waste (waste containing both hazardous and radioactive components) generated during Environmental Restoration Project cleanup activities at Los Alamos. As of 1995, there is no Resource Conservation and Recovery Act (RCRA) permitted disposal site for mixed waste at the Laboratory, and construction of the MWDF would provide an alternative to transport of this material to an off-site location. A 2.5 km long part of Pajarito Mesa was originally considered for the MWDF, extending from an elevation of about 2150 to 2225 m (7060 to 7300 ft) in Technical Areas (TAs) 15, 36, and 67 in the central part of the Laboratory, and planning was later concentrated on the western area in TA-67. The mesa top lies about 60 to 75 m (200 to 250 ft) above the floor of Pajarito Canyon on the north, and about 30 m (100 ft) above the floor of Threemile Canyon on the south. The main aquifer used as a water supply for the Laboratory and for Los Alamos County lies at an estimated depth of about 335 m (1100 ft) below the mesa. The chapters of this report focus on surface and near-surface geological studies that provide a basic framework for siting of the MWDF and for conducting future performance assessments, including fulfillment of specific regulatory requirements. This work includes detailed studies of the stratigraphy, mineralogy, and chemistry of the bedrock at Pajarito Mesa by Broxton and others, studies of the geological structure and of mesa-top soils and surficial deposits by Reneau and others, geologic mapping and studies of fracture characteristics by Vaniman and Chipera, and studies of potential landsliding and rockfall along the mesa-edge by Reneau.

Reneau, S.L.; Raymond, R. Jr. [eds.

1995-12-01

251

The Mesa Unified School District Advanced Placement Program--Perspectives of Former Students. Research Report 52.  

ERIC Educational Resources Information Center

Graduates of the Mesa Public Schools Advanced Placement (A/P) program were surveyed to determine: (1) their attitudes toward their experience in the program; (2) college credits received for their A/P classes; and (3) their suggestions for A/P program improvement. A/P courses, offered within the regular curriculum, have grown significantly since…

Troidl, Robert; DeGracie, James S.

252

Round Mesas on the Floor of Ravi Vallis, Mars - Are they Igneous Intrusions?  

NASA Astrophysics Data System (ADS)

Three round mesas have been discovered on the floor of Ravi Vallis. They may be an evolved form of the streamlined islands seen elsewhere in channels. Other evidence suggests they may be the flood-eroded remnants of igneous intrusive bodies (stocks) in the Noachian crust.

Coleman, N.

2008-03-01

253

Thermal management in large Bi2212 mesas used for terahertz sources.  

SciTech Connect

We present a thermal analysis of a patterned mesa on a Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} (Bi2212) single crystal that is based on tunneling characteristics of the c-axis stack of {approx}800 intrinsic Josephson junctions in the mesa. Despite the large mesa volume (e.g., 40 times 300 times 1.2 mum{sup 3}) and power dissipation that result in self-heating and backbending of the current-voltage curve (I-V), there are accessible bias conditions for which significant polarized THz-wave emission can be observed. We estimate the mesa temperature by equating the quasiparticle resistance, R{sub qp}(T), to the ratio V/I over the entire I-V including the backbending region. These temperatures are used to predict the unpolarized black-body radiation reaching our bolometer and there is substantial agreement over the entire I-V. As such, backbending results from the particular R{sub qp}(T) for Bi2212, as first discussed by Fenton, rather than a significant suppression of the energy gap. This model also correctly predicts the observed disappearance of backbending above {approx}60 K.

Kurter, C.; Gray, K. E.; Zasadzinski, J. F.; Ozyuzer, L.; Koshelev, A. E.; Li, Q.; Yamamoto, T.; Kadowaki, K.; Kwok, W.-K.; Tachiki, M.; Welp, U.; Materials Science Division; Izmir Inst. of Tech.; Illinois Inst. of Tech.; Univ. Tsukuba; Univ. Tokyo

2009-06-01

254

Mesa Verde: A Study of Man in an Agricultural Setting. Student Manual.  

ERIC Educational Resources Information Center

This student manual contains information and guides to assist the secondary student in functioning as an archeologist. Included are fables, pictures for analysis, a time line and description of the pre-history of Mesa Verde, Colorado. The manual concludes with artifact identification word sheets. A related document is ED 001 722. (AWW)

Community Health Service (DHEW/PHS), Bethesda, MD.

255

Women's Self-Efficacy Perceptions in Mathematics and Science: Investigating USC-MESA Students  

ERIC Educational Resources Information Center

Higher education institutions have struggled with the underrepresentation of female students in the STEM majors. The authors investigate the USC-MESA program and the role of women's self-efficacy perceptions in mathematics and science. It is crucial to understand the theory of self-efficacy in examining historically underrepresented populations in…

Hong, Rebecca C.; Jun, Alexander

2012-01-01

256

Portland Mathematics, Engineering, Science Achievement (MESA) Evaluation Report, 1986-1987.  

ERIC Educational Resources Information Center

The Portland Mathematics, Engineering, Science Achievement (MESA) program was designed to remedy the underrepresentation of particular ethnic groups in mathematics and science-based careers and professions. It provides enrichment instruction on a weekly basis in eight middle schools and three high schools to enhance mathematics and science skills…

Grice, Michael

257

Geohydrologic data and models of Rainier Mesa and their implications to Yucca Mountain  

Microsoft Academic Search

The geohydrologic data collected at Rainier Mesa provide the only extensive observations in tunnels presently available on flow and transport in tuff units similar to those of a potential nuclear waste repository at Yucca Mountain. This information can, therefore, be of great value in planning the Exploratory Studies Facility (ESF) testing in underground drifts at Yucca Mountain. In this paper,

J. S. Y. Wang; N. G. W. Cook; H. A. Wollenberg; C. L. Carnahan; I. Javandel; C. F. Tsang

1993-01-01

258

Mass transport in vitric tuffs of Rainier Mesa, Nye County, Nevada  

Microsoft Academic Search

Chemical and physical analyses of reactant and product phases found in subaerially-exposed vitric tuffs of Rainier Mesa, Nevada, indicate that diagenetic alteration is occurring today. Variations in the composition of the fluid phase with depth suggest a predominantly vertical transport process whereby the dissolution of metastable glass drives the sequential precipitation of montmorillonite, clinoptilolite and possibly analcime. Mordenite was found

1976-01-01

259

Influence of the Blue Mesa Reservoir on the Red Creek Landslide, Colorado  

E-print Network

Influence of the Blue Mesa Reservoir on the Red Creek Landslide, Colorado SCOTT R. WALKER URS Engineering, Colorado School of Mines, Golden, CO 80401 Key Terms: Landslide, Paleolandslide, Rapid Draw- down analyses support the theory that the active Red Creek Landslide is the partial reactivation of a larger

260

Emplacement of multiple magma sheets and wall rock deformation: Trachyte Mesa intrusion, Henry Mountains, Utah  

Microsoft Academic Search

A detailed structural and rock magnetic study of the Trachyte Mesa intrusion and deformed sedimentary wall rocks, Henry Mountains, Utah, indicates that the intrusion grew vertically and horizontally by the accumulation of multiple horizontal magma sheets. 2–3cm thick shear zones recognized by intensely cataclasized plagioclase phenocrysts define the contact between sheets. Sheets have bulbous and \\/ or steep frontal terminations

Sven Morgan; Amy Stanik; Eric Horsman; Basil Tikoff; Michel de Saint Blanquat; Guillaume Habert

2008-01-01

261

UN News Centre: The Middle East  

NSDL National Science Digital Library

The Middle East is a vastly complex region, both in terms of its cultural history and the very intricate political economy that is in flux throughout the area. The UN News Centre area dedicated to the Middle East will help interested parties keep abreast of developments in the area, along with providing them access to information about the UN's activities and initiatives in the region. The site organizes the material into a number of sections, such as those that contain press remarks and statements from the Secretary General, resolutions from the Secretary Council, and documents from the General Assembly relating to the Middle East. The homepage also contains specific information on the UN peace missions in such locales as Lebanon and the Golan Heights. As with most sites offered by the UN, the materials on this site are available in Arabic, French, Russian, Spanish, and Chinese.

262

Completion Report for Well ER-16-1 Corrective Action Unit 99: Rainier Mesa - Shoshone Mountain  

SciTech Connect

Well ER-16-1 was drilled for the U.S. Department of Energy, National Nuclear Security Administration Nevada Site Office, in support of the Nevada Environmental Restoration Project at the Nevada Test Site, Nye County, Nevada. The well was drilled in June and July 2005 as part of a hydrogeologic investigation program for the Rainier Mesa-Shoshone Mountain Corrective Action Unit, Number 99. The overall purpose of the well was to gather subsurface data to better characterize the hydrogeology of the Shoshone Mountain area, especially in the older Tertiary and pre-Tertiary strata. The main 46.99-centimeter hole was drilled to a depth of 702.9 meters and cased with 33.97-centimeter casing to 663.7 meters. The hole diameter was then decreased to 31.1 centimeters, and the well was drilled to total depth of 1,220.7 meters. A completion string set at the depth of 1,162.4 meters consisted of 13.97-centimeter stainless-steel casing, with one continuous slotted interval open to the lower carbonate aquifer. The fluid level in the borehole soon dropped, so the borehole was deepened in July 2006. To deepen the borehole, the slotted section was cemented and a 12.1-centimeter hole was drilled through the bottom of the completion string to the new total depth of 1,391.7 meters, which is 171.0 meters deeper than the original borehole. A string of 6.03-centimeter carbon-steel tubing with one continuous slotted interval at 1,361.8 to 1,381.4 meters, and open to the lower carbonate aquifer, was installed in the well with no gravel packing or cement, to serve as a monitoring string. Data gathered during and shortly after hole construction include composite drill cuttings samples collected every 3 meters (extra cuttings samples were collected from the Paleozoic rocks for paleontological analyses), sidewall core samples from 37 depths, various geophysical logs, and water level measurements. These data indicate that the well penetrated 646.8 meters of Tertiary volcanic rocks and 744.9 meters of Paleozoic dolomite, quartzite, shale, and limestone. Three weeks after the monitoring string was installed, the water level was tagged at the drill hole depth of 1,271.9 meters, which equates to an estimated elevation of 761.7 meters, accounting for the borehole angle.

NSTec Geology Services

2006-12-01

263

Stochastic source comparisons between nuclear and chemical explosions detonated at Rainier Mesa, Nevada Test Site  

SciTech Connect

The focus of this study is the understanding of the time function effects for chemical and nuclear explosion sources detonated in a spherical geometry. Information developed here in combination with similar studies for earthquakes and mining explosions will be used to improve current discriminants, address the transportability of the discriminants to new regions and suggest new discriminants utilizing current data sources. The quantification of the seismic source time function for nuclear and chemical explosions provides the basis for identifying source differences that may develop as a function of yield as well as explosive type (chemical or nuclear). The yield effects are useful in yield determination as well as assessing detection and identification capabilities if seismic monitoring of such sources is important. Source effects attributable to yield can be used to establish new or verify existing scaling relations.

Stump, B.W.; Pearson, D.C. [Los Alamos National Lab., NM (United States). Geophysics Group; Reinke, R.E. [Field Command Defense Nuclear Agency, Kirtland AFB, NM (United States)

1994-07-01

264

LONG-TERM EFFECTS OF LAND APPLICATION OF DOMESTIC WASTEWATER; MESA, ARIZONA: IRRIGATION SITE  

EPA Science Inventory

This report presents the results of an assessment of the long-term impacts on crops, soils, and groundwater resulting from irrigation with secondary-treated municipal effluent. The concentrations of pathogens, nutrients, heavy metals, and salts in soils, groundwater, and crops ir...

265

Final design, installation and baseline testing of 500 kW direct contact pilot plant at East Mesa  

SciTech Connect

The pilot plant was configured to accomplish two objectives - first to evaluate the overall performance potential of direct contact powerplants and second to develop design criteria and parameters for full-scale direct contact plants. The pilot plant includes all of the process functions that would be incorporated in a full-scale plant. Incoming brine is treated to remove undissolved gases, pumped through the direct contact heat exchanger (DCHX), and then sent to a recovery system for removal of the dissolved working fluid. The chosen working fluid is isobutane (IC/sub 4/). The working fluid loop includes a radial inflow turbine with generator, condensers, hot-well reservoir, and a feed pump. A downwell pump was installed in the geothermal well to supply the plant with unflashed brine. (MHR)

Hlinak, A.; Lobach, J.; Nichols, K.; Olander, R.; Werner, D.

1980-05-30

266

Final phase testing and evaluation of the 500 kW direct contact pilot plant at East Mesa  

SciTech Connect

The testing performed during the last phase of the geothermal direct contact heat exchanger program utilizing the 500 kW pilot plant provided more insight into the capabilities and limits of the direct contact approach and showed that more work needs to be done to understand the inner workings of a large direct contact heat exchanger if they are to be modeled analytically. Testing of the column demonstrated that the performance was excellent and that the sizing criteria is conservative. The system operated smoothly and was readily controlled over a wide range of operating conditions. Performance evaluation showed pinch differentials of 4/sup 0/F or less and better than predicted heat transfer capability. Testing during this final phase was directed towards establishing the limits of the column to transfer heat. The working column height was shortened progressively to approximately 16 feet from a design length of 28 feet. The short column performed as well as a full length column and there are indications that the column could have been shortened even more without affecting its ability to transfer heat. The column's ability to perform as well with shortened lengths indicates that the heat transfer coefficients and criteria derived from the small scale tests are very conservative.

Olander, R.; Oshmyansky, S.; Nichols, K.; Werner, D.

1983-12-01

267

14. View of interior, north and east walls featuring sink, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

14. View of interior, north and east walls featuring sink, facing east (Note: B/W scale on wall in foreground is in 1/2 ft increments) - Nevada Test Site, Reactor Maintenance & Disassembly Complex, Junior Hot Cell, Jackass Flats, Area 25, South of intersection of Roads F & G, Mercury, Nye County, NV

268

East Tennessee AgResearch & Education Center Organic Crops Unit  

E-print Network

East Tennessee AgResearch & Education Center Organic Crops Unit 7315 Government Farm Road Farm Road on the site of the former Small Grains Unit of the East Tennessee AgResearch and Education of Tennessee is an EEO/AA/Title VI/ Title IX/ Section 504/ADA/ADEA institution in the provision of its

Grissino-Mayer, Henri D.

269

Counterclockwise rotations in the Late Eocene-Oligocene volcanic fields of San Luis Potosí and Sierra de Guanajuato (eastern Mesa Central, Mexico)  

NASA Astrophysics Data System (ADS)

We used paleomagnetic and structural data to investigate the late Eocene-Oligocene tectonic evolution of the Mesa Central area in Mexico. The Mesa Central was affected by NW-trending faults (Tepehuanes-San Luis fault system) coeval with a Late Eocene-Oligocene ignimbrite flare-up and by post-27 Ma NNE-trending grabens related to the Basin and Range. We obtained reliable paleomagnetic directions from 61 sites within the Late Eocene-Oligocene volcanic series (~ 30 to ~ 27 Ma) of the San Luis Potosí volcanic field and Sierra de Guanajuato. For each site we also measured the anisotropy of magnetic susceptibility (AMS). Tilt corrections were made using AMS data for 33 sites where in situ bedding measurements were not available. Paleomagnetic directions indicate counterclockwise rotations of about 10° with respect to stable North America after 30-25 Ma. Structural data suggest that the volcanic succession was mainly affected by normal faults. However, we also found evidences for oblique or horizontal striae showing a left-lateral component along NW-trending faults and a right lateral component along NE-trending faults. Both motions are consistent with a N-S extension oblique to the Tepehuanes-San Luis fault system. Previous paleomagnetic studies in northern and southern Mexico show the prevalence of minor left-lateral shear components along regional-scale transpressional and transtensional lineaments. Our paleomagnetic data may reflect thus small vertical-axis rotations related to a minor shear component coeval with the Oligocene intra-arc extension in central Mexico.

Andreani, Louis; Gattacceca, Jerôme; Rangin, Claude; Martínez-Reyes, Juventino; Demory, François

2014-12-01

270

Effect of mesa overgrowth on low-frequency noise in planar separate absorption, grading, charge, and multiplication avalanche photodiodes  

Microsoft Academic Search

The purpose of this paper is to present a detailed comparison of the low-frequency noise in single-growth and mesa overgrown planar separate absorption, grading, charge, and multiplication (SAGCM) avalanche photodiodes (APD's) passivated with SiNx. It was found that existing models did not explain the bias dependence of the low-frequency noise in the mesa overgrown devices. We have found that a

Serguei An; M. Jamal Deen; A. S. Vetter; W. R. Clark; J.-P. Noel; F. R. Shepherd

1999-01-01

271

15. VIEW LOOKING EAST, SHOWING RETAINING WALL ON EAST SIDE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

15. VIEW LOOKING EAST, SHOWING RETAINING WALL ON EAST SIDE OF PARK, SOUTH OF ENGINE HOUSE (4' X 5' negative) - Fairmount Waterworks, East bank of Schuylkill River, Aquarium Drive, Philadelphia, Philadelphia County, PA

272

55. LOOKING EAST FROM HEAD OF PLANE 2 EAST. POWER ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

55. LOOKING EAST FROM HEAD OF PLANE 2 EAST. POWER HOUSE AND FLUME VISIBLE TO RIGHT, TAILRACE RUNNING THROUGH CENTER OF PHOTOGRAPH. CRADLE TO INCLINED PLANE 3 EAST IS VISIBLE IN BACKGROUND TO LEFT. - Morris Canal, Phillipsburg, Warren County, NJ

273

5. SOUTH AND EAST SIDES, NOTE DISTRIBUTION LINES FROM EAST ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

5. SOUTH AND EAST SIDES, NOTE DISTRIBUTION LINES FROM EAST WALL; VIEW TO NORTHWEST. - Cape Canaveral Air Station, Launch Complex 17, Facility 28422, East end of Lighthouse Road, Cape Canaveral, Brevard County, FL

274

Evaluation of Pleistocene groundwater flow through fractured tuffs using a U-series disequilibrium approach, Pahute Mesa, Nevada, USA  

USGS Publications Warehouse

Groundwater flow through fractured felsic tuffs and lavas at the Nevada National Security Site represents the most likely mechanism for transport of radionuclides away from underground nuclear tests at Pahute Mesa. To help evaluate fracture flow and matrix–water exchange, we have determined U-series isotopic compositions on more than 40 drill core samples from 5 boreholes that represent discrete fracture surfaces, breccia zones, and interiors of unfractured core. The U-series approach relies on the disruption of radioactive secular equilibrium between isotopes in the uranium-series decay chain due to preferential mobilization of 234U relative to 238U, and U relative to Th. Samples from discrete fractures were obtained by milling fracture surfaces containing thin secondary mineral coatings of clays, silica, Fe–Mn oxyhydroxides, and zeolite. Intact core interiors and breccia fragments were sampled in bulk. In addition, profiles of rock matrix extending 15 to 44 mm away from several fractures that show evidence of recent flow were analyzed to investigate the extent of fracture/matrix water exchange. Samples of rock matrix have 234U/238U and 230Th/238U activity ratios (AR) closest to radioactive secular equilibrium indicating only small amounts of groundwater penetrated unfractured matrix. Greater U mobility was observed in welded-tuff matrix with elevated porosity and in zeolitized bedded tuff. Samples of brecciated core were also in secular equilibrium implying a lack of long-range hydraulic connectivity in these cases. Samples of discrete fracture surfaces typically, but not always, were in radioactive disequilibrium. Many fractures had isotopic compositions plotting near the 230Th-234U 1:1 line indicating a steady-state balance between U input and removal along with radioactive decay. Numerical simulations of U-series isotope evolution indicate that 0.5 to 1 million years are required to reach steady-state compositions. Once attained, disequilibrium 234U/238U and 230Th/238U AR values can be maintained indefinitely as long as hydrological and geochemical processes remain stable. Therefore, many Pahute Mesa fractures represent stable hydrologic pathways over million-year timescales. A smaller number of samples have non-steady-state compositions indicating transient conditions in the last several hundred thousand years. In these cases, U mobility is dominated by overall gains rather than losses of U.

Paces, James B.; Nichols, Paul J.; Neymark, Leonid A.; Rajaram, Harihar

2013-01-01

275

Investigations on the Structure Tectonics, Geophysics, Geochemistry, and Hydrocarbon Potential of the Black Mesa Basin, Northeastern Arizona  

SciTech Connect

The U.S. Department of Energy (DOE) has instituted a basin-analysis study program to encourage drilling in underexplored and unexplored areas and increase discovery rates for hydrocarbons by independent oil companies within the continental United States. The work is being performed at the DOE's National Institute for Petroleum and Energy Research (NIPER) in Bartlesville, Oklahoma, by the Exploration and Drilling Group within BDM-Oklahoma (BDM), the manager of the facility for DOE. Several low-activity areas in the Mid-Continent, west, and southwest were considered for the initial study area (Reeves and Carroll 1994a). The Black Mesa region in northwestern Arizona is shown on the U.S. Geological Survey 1995 oil and gas map of the United States as an undrilled area, adapted from Takahashi and Gautier 1995. This basin was selected by DOE s the site for the initial NIPER-BDM survey to develop prospects within the Lower-48 states (Reeves and Carroll 1994b).

Barker, Colin; Carroll, Herbert; Erickson, Richard; George, Steve; Guo, Genliang; Reeves,T.K.; Sharma, Bijon; Szpakiewicz, Michael; Volk, Len

1999-04-27

276

Characterization of room temperature AlGaAs soft X-ray mesa photodiodes  

NASA Astrophysics Data System (ADS)

Results characterising a set of nine prototype Al0.8Ga0.2As p+-i-n+ mesa photodiodes (400 ?m diameter, 1.7 ?m i layer) are presented. The results show the performance of the devices as room temperature spectroscopic photon counting soft X-ray detectors. The responses of the photodiodes to illumination with an 55Fe radioisotope X-ray source were measured using a low noise charge sensitive preamplifier; the energy resolutions measured with the devices were consistent with each other and had a mean FWHM at 5.9 keV of 1.27 keV. The devices are the thickest (highest detection efficiency) AlGaAs X-ray spectroscopic mesa photodiodes reported in the literature to date. They also have better energy resolution than all previously reported non-avalanche AlGaAs X-ray detectors of the same area.

Barnett, A. M.; Lioliou, G.; Ng, J. S.

2015-02-01

277

Imaging of local temperature distributions in mesas of high-Tc superconducting terahertz sources  

NASA Astrophysics Data System (ADS)

Stacks of intrinsic Josephson junctions in high-Tc superconductors are a promising source of intense, continuous, and monochromatic terahertz waves. In this paer, we establish a fluorescence-based temperature imaging system to directly image the surface temperature on a Bi2Sr2CaCu2O8+? mesa sample. Intense terahertz emissions are observed in both high- and low-bias regimes, where the mesa voltage satisfies the cavity resonance condition. In the high- bias regime, the temperature distributions are shown to be inhomogeneous with a considerable temperature rise. In contrast, in the low-bias regime, the distributions are rather uniform and the local temperature is close to the bath temperature over the entire sample.

Tsujimoto, M.; Kambara, H.; Maeda, Y.; Yoshioka, Y.; Nakagawa, Y.; Kakeya, I.

2014-12-01

278

Mesa-isolated InGaAs avalanche photodiode damage by ionizing radiation  

NASA Astrophysics Data System (ADS)

InGaAs avalanche photodiodes (APDs) fabricated from epitaxial material by etching detector mesas and encapsulating the etched mesas under bisbenzocyclobutene (BCB) resin were irradiated by Co-60 gamma-rays to assess their sensitivity to a total ionizing dose of 200 krad(Si). A low-excess-noise APD design with a multi-stage avalanche gain region was tested. Ninety-six identical 20-?m-diameter APDs were characterized to assess the response of the design to ionizing radiation. The APDs were not under bias during irradiation. Damage to the APDs was characterized by measuring the change in room temperature dark current following irradiation, at a reverse bias for which the average avalanche gain is M=10. No significant increase of dark current was observed following gamma irradiation: the average increase was 5% and the standard deviation for the measurement was 10%.

Huntington, Andrew S.; Sellsted, Leah A.; Compton, Madison A.; Taylor, Edward W.

2011-09-01

279

East Jerusalem: Mount of Olives Jewish Cemetary  

Microsoft Academic Search

The Jewish Cemetary on the Mount of Olives has been active for over 2000 years. The site is desirable for those of Jewish faith as a Bible verse (Zech. 14:4) claims that the resurrection will begin here when the messiah arrives. The Mount of Olives is a mountain ridge in East Jerusalem whose name dates back thousands of years when

Chet Smolski

1980-01-01

280

Coal and coalbed methane resources of Cretaceous rocks of the Black Mesa Basin, northeastern Arizona  

SciTech Connect

Cretaceous rocks of the Black Mesa basin of northeastern Arizona were deposited from Late Cenomanian to Santonian time near the western depositional limit of the transgressive-regressive Greenhorn and Niobrara cyclothems. Coal-bearing rocks of the sequence (including the Dakota Formation, Toreva Formation and Wepo Formation) are preserved in the Black Mesa structural basin of Laramide age. These rocks of the Black Mesa basin are the object of an NSF-sponsored research project to evaluate their coal resources and potential for coalbed methane occurrence. Forty-five measured sections and descriptions of Cretaceous rocks around the eastern margin of the basin have been incorporated into a data base in the software program LOGGER, and have been used to construct a series of stratigraphic cross-sections across the basin using the software program MacSection. These include coal beds and carbonaceous shales that are potential sources of methane as well as reservoirs, and sandstone bodies that are potential secondary reservoirs of methane (and possibly petroleum hydrocarbons from the Mancos Shale). In order to trace the facies changes between measured sections, aerial videography and 35 mm slides have been taken along the entire eastern margin of Black Mesa, a distance of 70 miles. These were digitized to provide detailed lithofacies analyses of the stratigraphic sections along the north-trending cliff line. Trends of thickness variations within these facies are interpreted from isopach maps and known shoreline trends, in order to predict the areas of greatest probability of coalbed methane generation and accumulation. These predictions are also based on the locations of anticlinal and monoclinal fold axes where they cross the thickest coal trends, due to likely enhancement of permeability by cleat and butt fractures in the coal and shale reservoir rocks.

Nations, J.D.; Haven, H.W.; Swift, R.L. [Northern Arizona Univ., Flagstaff, AZ (United States)

1995-06-01

281

Differential Sensitivity Theory applied to the MESA2D code for multi-material problems  

Microsoft Academic Search

The technique called Differential Sensitivity Theory (DST) is extended to the multi-component system of equations solved by the MESA2D hydrocode. DST uses adjoint techniques to determine exact sensitivity derivatives, i.e., if R is a calculation result of interest (response R) and alphai is a calculation input (parameter alphai), then ?R\\/?alphai is defined as the sensitivity. The advantage of using DST

R. J. Henninger; P. J. Maudlin; E. N. Harstad

1996-01-01

282

256??1 doped-InGaAs mesa infrared focal plane array  

Microsoft Academic Search

We have made 256x1 front-illuminated mesa doped-InGaAs infrared focal plane array (FPA) with two CTIA-structure L128 read out integrate circuit at two sides. The mean peak detectivity of the detectors is 1.33x1012 cmHz1\\/2W-1 at 278 K. The un uniformity of response is 19.3% at room temperature.

Yanqiu Lv; Bing Han; Yunhua Xu; Xiaoli Wu; Xue Li; Haimei Gong

2006-01-01

283

Variation in the annual average radon concentration measured in homes in Mesa County, Colorado  

SciTech Connect

The purpose of this study is to examine the variability in the annual average indoor radon concentration. The TMC has been collecting annual average radon data for the past 5 years in 33 residential structures in Mesa County, Colorado. This report is an interim report that presents the data collected up to the present. Currently, the plans are to continue this study in the future. 62 refs., 3 figs., 12 tabs.

Rood, A.S.; George, J.L.; Langner, G.H. Jr.

1990-04-01

284

Historical and recent fire regimes in Piñon–Juniper woodlands on Mesa Verde, Colorado, USA  

Microsoft Academic Search

The fire history of Piñon–Juniper (Pinus edulis–Juniperus osteosperma) woodlands in much of the southwestern United States is poorly understood, and as a result, fire management decisions are being made without a rigorous ecological underpinning. We investigated the historic fire regimes in Piñon–Juniper woodlands on the Mesa Verde cuesta utilizing stand and age structures. All Piñon trees in eight stands were

M. Lisa Floyd; David D. Hanna; William H. Romme

2004-01-01

285

Mineral resources of the Dominguez Canyon Wilderness Study Area, Delta, Mesa, and Montrose counties, Colorado  

SciTech Connect

The Dominguez Canyon Wilderness Study Area in Delta, Mesa, and Montrose counties, Colorado, contains flat-lying sedimentary rocks of Triassic to Cretaceous age underlain by Proterozoic crystalline rocks. Investigations by the US Geological Survey and US Bureau of Mines revealed that the wilderness study area has low mineral resource potential for metals, including uranium, oil and gas, coal, and geothermal energy. No identified resources are present.

Toth, M.I.; Patterson, C.G.; Kulik, D.M.; Schreiner, R.A.

1987-01-01

286

Exploring Stellar Evolution Models of sdB Stars Using MESA With Convective Overshoot  

NASA Astrophysics Data System (ADS)

We have used MESA (Modules for Experiments in Stellar Astrophysics) to explore how well stellar evolutionary theory reproduces observational data on sdB stars. We investigate two problems. First, asteroseismological analyses of g-mode pulsators suggest He-CO cores of the order of 0.25 M?, i.e. 40-50% of the total stellar mass. Conventional stellar evolution, using MLT theory without convective overshoot, produces significantly smaller cores (˜0.1 M?). We have produced evolutionary sequences with varying amounts of overshoot. A sufficiently high value of convective overshoot does produce He-CO core masses comparable to those suggested by the asteroseismological analyses. The large amount of overshooting required gives rise to a second stage of helium-core burning for some of our models. This may not be physically realistic, since evolution following initial core helium exhaustion with large convective overshoot appears to strain some of the current modules in MESA (with regard to convective boundary layers and composition gradients, for example). The second problem is that surface gravities and effective temperatures determined from optical spectra and asteroseismology do not match very well the evolutionary paths calculated by MESA (or other stellar evolutionary codes). The more extreme overshooting needed to produce more massive He-CO cores has little effect on the effective temperatures and surface gravities.

Schindler, J.; Green, E.; Arnett, D.

2014-04-01

287

Mesa corrosion attack in carbon steel and 0.5% chromium steel  

SciTech Connect

Local breakdown of protective corrosion films may result in rapid local attack or mesa corrosion attack during CO{sub 2} corrosion of carbon steel. The factors affecting formation and local breakdown of protective corrosion films were studied in a series of flow loop experiments performed at 40--80 C with pH 5.8, 1.8 bar CO{sub 2} partial pressure, high iron content in the water and flow rates 0.1--7 m/s. Carbon steels with or without chromium and nickel additions up to 1% were tested. Addition of 0.5% chromium in the steel was found to reduce the tendency for severe mesa attack in carbon steels during CO{sub 2} corrosion significantly. Deep mesa attack did not occur in steels with 0.5--1% Cr in experiments at 80 C and pH 5.8. Protective corrosion films reform more easily in the chromium containing steels, making localized attack less dangerous in chromium containing steels than in unalloyed carbon steels.

Nyborg, R.; Dugstad, A. [Inst. for Energy Technology, Kjeller (Norway)

1998-12-31

288

17. INTERIOR NORTH BAY DETAIL VIEW, FACING EAST. TRACKS FOR ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

17. INTERIOR NORTH BAY DETAIL VIEW, FACING EAST. TRACKS FOR MOVEMENT OF MATERIALS, STORAGE BINS ABANDONED ON SITE. - NASA Industrial Plant, Missile Research Laboratory, 12214 Lakewood Boulevard, Downey, Los Angeles County, CA

289

Detail view to the east of the Antenna Array ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Detail view to the east of the Antenna Array - Over-the-Horizon Backscatter Radar Network, Christmas Valley Radar Site Transmit Sector Six Antenna Array, On unnamed road west of Lost Forest Road, Christmas Valley, Lake County, OR

290

View of EPA Farm metal weather tower, facing east, showing ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

View of EPA Farm metal weather tower, facing east, showing thirty-acre irrigated field - Nevada Test Site, Environmental Protection Agency Farm, Weather Tower, Area 15, Yucca Flat, 10-2 Road near Circle Road, Mercury, Nye County, NV

291

2. VIEW OF OFFICE (FEATURE 11), FACING EAST, SOUTHEAST. MILL ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. VIEW OF OFFICE (FEATURE 11), FACING EAST, SOUTHEAST. MILL SITE IS SHOWN IN THE UPPER LEFT CORNER OF PHOTOGRAPH. - Copper Canyon Camp of the International Smelting & Refining Company, Office, Copper Canyon, Battle Mountain, Lander County, NV

292

5. TIP TOP MINE. EAST SIDE OF STRUCTURE WITH COLLAPSED ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

5. TIP TOP MINE. EAST SIDE OF STRUCTURE WITH COLLAPSED ADIT. CAMERA POINTED WEST. - Florida Mountain Mining Sites, Tip Top Mine, West face Florida Mountain, approximately 150 feet below summit, Silver City, Owyhee County, ID

293

3. UPPER NOTTINGHAM MINE, COLLAPSED ADIT. CAMERA IS POINTED EAST. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. UPPER NOTTINGHAM MINE, COLLAPSED ADIT. CAMERA IS POINTED EAST. - Florida Mountain Mining Sites, Upper Nottingham Mine, West face of Florida Mountain, head of Jacobs Gulch, Silver City, Owyhee County, ID

294

2. TIP TOP MINE. NORTH AND EAST SIDE OF HOUSE. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. TIP TOP MINE. NORTH AND EAST SIDE OF HOUSE. CAMERA POINTED SOUTH. - Florida Mountain Mining Sites, Tip Top Mine, West face Florida Mountain, approximately 150 feet below summit, Silver City, Owyhee County, ID

295

16. VIEW OF FIRST FLOOR EAST OPERATING GALLERY. NOTE THE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

16. VIEW OF FIRST FLOOR EAST OPERATING GALLERY. NOTE THE SERIES OF MANIPULATOR ARMS ALONG THE LEFT WALL. - Nevada Test Site, Engine Maintenance Assembly & Disassembly Facility, Area 25, Jackass Flats, Mercury, Nye County, NV

296

15. INTERIOR VIEW TO THE EAST OF ROOM 102, A ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

15. INTERIOR VIEW TO THE EAST OF ROOM 102, A MACHINE SHOP ADJACENT TO ASSEMBLY BAY NO. 1. - Nevada Test Site, Reactor Maintenance Assembly & Dissassembly Facility, Area 25, Jackass Flats, Junction of Roads F & G, Mercury, Nye County, NV

297

4. EXTERIOR VIEW TO THE EAST OF THE WEST ELEVATION ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. EXTERIOR VIEW TO THE EAST OF THE WEST ELEVATION OF THE COLD ASSEMBLY AREA. - Nevada Test Site, Reactor Maintenance Assembly & Dissassembly Facility, Area 25, Jackass Flats, Junction of Roads F & G, Mercury, Nye County, NV

298

10. VIEW WITHIN THE EAST OPERATING GALLERY OF WORK STATION ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

10. VIEW WITHIN THE EAST OPERATING GALLERY OF WORK STATION WITH MANIPULATOR ARMS. - Nevada Test Site, Engine Maintenance Assembly & Disassembly Facility, Area 25, Jackass Flats, Mercury, Nye County, NV

299

8. EXTERIOR VIEW TO THE WEST OF THE EAST ELEVATION ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

8. EXTERIOR VIEW TO THE WEST OF THE EAST ELEVATION OF THE HOT DISASSEMBLY AREA. - Nevada Test Site, Reactor Maintenance Assembly & Dissassembly Facility, Area 25, Jackass Flats, Junction of Roads F & G, Mercury, Nye County, NV

300

28. ELEVATION LOOKING EAST, ORIGINAL MARCONI ANTENNA POLES WERE 300' ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

28. ELEVATION LOOKING EAST, ORIGINAL MARCONI ANTENNA POLES WERE 300' TALL (AT LEAST TWICE THE HEIGHT OF THOSE APPEARING IN PICTURE). - Marconi Radio Sites, Transmitting, Point Reyes Station, Marin County, CA

301

Stratigraphic revision and depositional environments of the Upper Cretaceous Toreva Formation in the northern Black Mesa area, Navajo and Apache counties, Arizona  

SciTech Connect

Two units previously included in the upper part of the Toreva Formation in northern Black Mesa have been assigned new stratigraphic names. One unit previously assigned to the Toreva is reassigned to the Wepo Formation. This report describes the sedimentology of the Toreva Formation and these new units and the depositional history of the Black Mesa area during middle Turonian through early Santonian time. Correlations are made among these units on Black Mesa and Cretaceous sequences in southern Utah and western New Mexico.

Franczyk, K.J.

1988-01-01

302

Shallow and Deep Current Variability in the Southwestern Japan/East Sea D. Randolph Watts  

E-print Network

Shallow and Deep Current Variability in the Southwestern Japan/East Sea D. Randolph Watts Graduate of the mesoscale circulation in the Japan/East Sea, with our efforts focusing on the southwestern region where Basin of the Japan / East Sea. Yellow diamonds designate PIES sites (P­) and magenta dots designate CM

Rhode Island, University of

303

Shallow and Deep Current Variability in the Southwestern Japan/East Sea D. Randolph Watts  

E-print Network

Shallow and Deep Current Variability in the Southwestern Japan/East Sea D. Randolph Watts Graduate://po.gso.uri.edu/dynamics/jes/index.html LONG-TERM GOALS We seek to understand the physics of the mesoscale circulation in the Japan/East Sea of the Japan / East Sea. Yellow diamonds designate PIES sites (labeled Pj_k) and magenta dots designate CM

Rhode Island, University of

304

Traditional Architecture of East Asia  

NSDL National Science Digital Library

Designed by graduate students in architecture at Yale and the University of Virginia, this Website presents an online collection of East Asian architectural photos, featuring China, Japan, North and South Korea, Cambodia, and Thailand. The site currently offers over 1,400 photographs covering interior, exterior, close-up, and long-shot views of 115 architectural sites, including such places as China's Forbidden City and the Great Wall, Japan's Kyoto Imperial Palace and Osaka Castle, South Korea's Munmyo Confucian Shrine and selected streets of Seoul, North Korea's War Cemetery, Cambodia's Angor Wat Temple, and many more. The pictures come in thumbnail and full-frame sizes and have brief, descriptive captions. (Some proceed in a manner that creates a kind of "virtual tour"; others are somewhat more haphazard.)

305

Metolachlor metabolite (MESA) reveals agricultural nitrate-N fate and transport in Choptank River watershed.  

PubMed

Over 50% of streams in the Chesapeake Bay watershed have been rated as poor or very poor based on the index of biological integrity. The Choptank River estuary, a Bay tributary on the eastern shore, is one such waterway, where corn and soybean production in upland areas of the watershed contribute significant loads of nutrients and sediment to streams. We adopted a novel approach utilizing the relationship between the concentration of nitrate-N and the stable, water-soluble herbicide degradation product MESA {2-[2-ethyl-N-(1-methoxypropan-2-yl)-6-methylanilino]-2-oxoethanesulfonic acid} to distinguish between dilution and denitrification effects on the stream concentration of nitrate-N in agricultural subwatersheds. The ratio of mean nitrate-N concentration/(mean MESA concentration * 1000) for 15 subwatersheds was examined as a function of percent cropland on hydric soil. This inverse relationship (R(2)=0.65, p<0.001) takes into consideration not only dilution and denitrification of nitrate-N, but also the stream sampling bias of the croplands caused by extensive drainage ditch networks. MESA was also used to track nitrate-N concentrations within the estuary of the Choptank River. The relationship between nitrate-N and MESA concentrations in samples collected over three years was linear (0.95 ? R(2) ? 0.99) for all eight sampling dates except one where R(2)=0.90. This very strong correlation indicates that nitrate-N was conserved in much of the Choptank River estuary, that dilution alone is responsible for the changes in nitrate-N and MESA concentrations, and more importantly nitrate-N loads are not reduced in the estuary prior to entering the Chesapeake Bay. Thus, a critical need exists to minimize nutrient export from agricultural production fields and to identify specific conservation practices to address the hydrologic conditions within each subwatershed. In well drained areas, removal of residual N within the cropland is most critical, and practices such as cover crops which sequester the residual N should be strongly encouraged. In poorly drained areas where denitrification can occur, wetland restoration and controlled drained structures that minimize ditch flow should be used to maximize denitrification. PMID:24388901

McCarty, Gregory W; Hapeman, Cathleen J; Rice, Clifford P; Hively, W Dean; McConnell, Laura L; Sadeghi, Ali M; Lang, Megan W; Whitall, David R; Bialek, Krystyna; Downey, Peter

2014-03-01

306

19. VIEW OF CRUDE ORE BINS FROM EAST. EAST CRUDE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

19. VIEW OF CRUDE ORE BINS FROM EAST. EAST CRUDE ORE BIN IN FOREGROUND WITH DISCHARGE TO GRIZZLY AT BOTTOM OF VIEW. CONCRETE RETAINING WALL TO LEFT (SOUTH) AND BOTTOM (EAST EDGE OF EAST BIN). - Bald Mountain Gold Mill, Nevada Gulch at head of False Bottom Creek, Lead, Lawrence County, SD

307

EAST ARMENIAN READER.  

ERIC Educational Resources Information Center

THIS EAST ARMENIAN READER CONSISTS OF MATERIAL WRITTEN IN MESROPIAN SPELLING. AN INTRODUCTION (WRITTEN IN ENGLISH) PROVIDES A HISTORICAL REVIEW OF THE ARMENIAN LANGUAGE. GLOSSARIES (ARMENIAN-ENGLISH) AND RULES FOR ABBREVIATIONS, SPELLING, AND WORD COMPOSITION ARE INCLUDED. (GC)

ESSABAL, PAUL

308

The Middle East Institute at Columbia University  

NSDL National Science Digital Library

Founded in 1954, the Middle East Institute of Columbia University has offered a multidisciplinary approach to studying the Middle East, with a particular emphasis on the 19th and 20th century. Currently under the direction of Professor Rashid Khalidi, the Institute sponsors a number of conferences and talks each year, and also functions as a clearinghouse for information on the region. Alongside detailed information about various public programs for scholars and the general public, the institute's site also provides some helpful educational materials, such as a Research Projects section. Here visitors can download materials on educational outreach for Muslim sensitivity, and peruse other documents on researching Middle East topics on the Internet. The e-Resources section is also worth a look, as it contains a number of archived lectures on very topical themes, including Iran and Israeli and Palestinian nationalism.

309

Saban Center for Middle East Policy  

NSDL National Science Digital Library

Launched in May 2002, the Saban Center for Middle East Policy performs original research surveys and studies in order "to promote a better understanding of the policy choices facing American decisionmakers in the Middle East." Visitors to the site will note that the homepage contains four primary sections, including "Research", "Events", and "Experts". "Research" includes dozens of topical reports and policy briefs organized into thematic categories such as "Middle East Democracy and Development" and "Terrorism". The "Events" area includes information both about upcoming talks and symposia sponsored by the Center and brief synopses of those events that have already occurred. Finally, the "Experts" section provides information on various scholars and fellows who are affiliated with the Center.

310

Middle East Research and Information Project  

NSDL National Science Digital Library

Established 32 years ago, the Middle East Research and Information Project (MERIP) is a non-profit, non-governmental organization based in Washington, DC. The Project has been quite successful over the past few decades due to its commitment to providing a broad range of perspectives on the Middle East not generally found in some of the mainstream media and press coverage. While the organization's primary publication, the Middle East Report, is not available for free on the site (although some of its editorial pieces are), visitors will want to take a close look at the Middle East Report Online, which is available here. Recent features within the online report deal with the future of Middle East studies in American universities, ethnic unrest in Iraq, and the long-standing dispute over Western Sahara. For visitors interested in a particular subject, there is a subject index of articles, and a feature that allows interested parties to sign up to receive the online reports via email.

311

77 FR 41807 - New Gear Process, a Division of Magna Powertrain, Including On-Site Leased Workers From ABM...  

Federal Register 2010, 2011, 2012, 2013

...Janitorial Service Northeast, Inc., East Syracuse, NY; Amended Certification Regarding...a Division of Magna Powertrain, East Syracuse, New York. The workers produce automotive...were employed on-site at the East Syracuse, New York location of New Process...

2012-07-16

312

A preliminary guidebook for identifying stratigraphic contacts at the Nevada Test Site  

SciTech Connect

Lithologic variation, regional depositional trends, and the lack of written guidelines have resulted in inconsistencies in the recognition of stratigraphic contacts in drill holes at the Nevada Test Site (NTS). Stratigraphic identification, based on mineralogy of discrete samples, can be augmented by geophysical logs and downhole movies to more accurately and consistently locate contacts between units. Criteria are established for locating the base of the Pahute Mesa ash-flow tuff, the top of the Ammonia Tanks ash-flow tuff, the top of the Ammonia Tanks bedded tuff, and the top and the base of the Rainier Mesa Tuff.

Pawloski, G.A.; McKague, H.L.; Wagoner, J.L. [Lawrence Livermore National Lab., CA (United States); McKinnis, W.B. [Lawrence Livermore National Lab., Mercury, NV (United States)

1992-01-01

313

Cutoff-mesa isolated rib optical waveguide for III-V heterostructure photonic integrated circuits  

DOEpatents

A cutoff mesa rib waveguide provides single-mode performance regardless of any deep etches that might be used for electrical isolation between integrated electrooptic devices. Utilizing a principle of a cutoff slab waveguide with an asymmetrical refractive index profile, single mode operation is achievable with a wide range of rib widths and does not require demanding etch depth tolerances. This new waveguide design eliminates reflection effects, or self-interference, commonly seen when conventional rib waveguides are combined with deep isolation etches and thereby reduces high order mode propagation and crosstalk compared to the conventional rib waveguides. 7 figs.

Vawter, G.A.; Smith, R.E.

1998-04-28

314

Magnetotelluric study of the Pahute Mesa and Oasis Valley regions, Nye County, Nevada  

USGS Publications Warehouse

Magnetotelluric data delineate distinct layers and lateral variations above the pre-Tertiary basement. On Pahute Mesa, three resistivity layers associated with the volcanic rocks are defined: a moderately resistive surface layer, an underlying conductive layer, and a deep resistive layer. Considerable geologic information can be derived from the conductive layer which extents from near the water table down to a depth of approximately 2 km. The increase in conductivity is probably related to zeolite zonation observed in the volcanic rock on Pahute Mesa, which is relatively impermeable to groundwater flow unless fractured. Inferred faults within this conductive layer are modeled on several profiles crossing the Thirsty Canyon fault zone. This fault zone extends from Pahute Mesa into Oasis Valley basin. Near Colson Pond where the basement is shallow, the Thirsty Canyon fault zone is several (~2.5) kilometers wide. Due to the indicated vertical offsets associated with the Thirsty Canyon fault zone, the fault zone may act as a barrier to transverse (E-W) groundwater flow by juxtaposing rocks of different permeabilities. We propose that the Thirsty Canyon fault zone diverts water southward from Pahute Mesa to Oasis Valley. The electrically conductive nature of this fault zone indicates the presence of abundant alteration minerals or a dense network of open and interconnected fractures filled with electrically conductive groundwater. The formation of alteration minerals require the presence of water suggesting that an extensive interconnected fracture system exists or existed at one time. Thus, the fractures within the fault zone may be either a barrier or a conduit for groundwater flow, depending on the degree of alteration and the volume of open pore space. In Oasis Valley basin, a conductive surface layer, composed of alluvium and possibly altered volcanic rocks, extends to a depth of 300 to 500 m. The underlying volcanic layer, composed mostly of tuffs, fills the basin with about 3-3.5 km of relief on basement. A fault zone, related to the southern margin of the basin, appears to extend up to a depth of about 500 m. The path of groundwater encountering this fault zone is uncertain but may be either to the southwest towards Beatty or to the south towards Crater Flat.

Schenkel, Clifford J.; Hildenbrand, Thomas G.; Dixon, Gary L.

1999-01-01

315

Continuity and change, an archaeobotanical assessment of Tsosie Shelter, Black Mesa, Arizona  

E-print Network

are represented at the highest el evat iona in the deeply entrenched sandstone canyons near the northeast rim of Black Mesa. Colorado pinyon (Pinus edulis), ponderosa pine (Pinus 2 d t, " g ? ' (~dt ' -*' ) f dep ending on the e&posure of the slope. Douglas... by stream 15 i'd+ r 1 ( I 0 sV A V Ai J . 0 . r ( . ". . - , ig ( C. =i c E S . E . V A T 4 0 . 5mr. Adapted from U. S. G. S. 75 mmute quadrangle LONG HOUSE VALLEY, ARIZONA KEY ~ Tsosle Shelter ID:7:20851 ~ Control Shelter ID:7:2085a 1...

Ruppe?, Patricia A

2012-06-07

316

The MESA polarimetry chain and the status of its double scattering polarimeter  

SciTech Connect

We plan to have two independent polarimetry systems at MESA based on totally different physical processes. A first one tries to minimize the systematic uncertainties in double polarized Mo/ller scattering, which is to be achieved by stored hydrogen atoms in an atomic trap (Hydro-Mo/ller-Polarimeter). The other one relies on the equality of polarizing and analyzing power which allows to measure the effective analyzing power of a polarimeter with very high accuracy. Since the status of Hydro-Mo/ller is presented in a separate paper we concentrate on the double scattering polarimeter in this article.

Aulenbacher, K.; Bartolomé, P. Aguar; Molitor, M.; Tioukine, V. [Institut für Kernphysik, Johannnes-Gutenberg-Universität Mainz (Germany)

2013-11-07

317

Cutoff-mesa isolated rib optical waveguide for III-V heterostructure photonic integrated circuits  

DOEpatents

A cutoff mesa rib waveguide provides single-mode performance regardless of any deep etches that might be used for electrical isolation between integrated electrooptic devices. Utilizing a principle of a cutoff slab waveguide with an asymmetrical refractive index profile, single mode operation is achievable with a wide range of rib widths and does not require demanding etch depth tolerances. This new waveguide design eliminates reflection effects, or self-interference, commonly seen when conventional rib waveguides are combined with deep isolation etches and thereby reduces high order mode propagation and crosstalk compared to the conventional rib waveguides.

Vawter, Gregory A. (Albuquerque, NM); Smith, Robert E. (Albuquerque, NM)

1998-01-01

318

Optical measurement of surface recombination in InGaAs quantum well mesa structures  

NASA Astrophysics Data System (ADS)

Surface recombination of optically created electron-hole plasma in InGaAs/InP quantum well mesa structures formed by chemical beam epitaxy followed by anisotropic plasma etching is observed optically by a picosecond pump-probe method. The exponential carrier lifetime in 3.3-micron-diam structures is reduced from 31 ns as measured for large diameters to 5.5 ns. This reduction is ascribed to a surface recombination velocity of 12,000 cm/s. The surface recombination velocity is about two orders of magnitude smaller than those reported for bulk GaAs layers exposed to air.

Tai, K.; Hayes, T. R.; McCall, S. L.; Tsang, W. T.

1988-07-01

319

A macrofossil analysis of materials recovered from Hovenweep National Monument, Cajon Mesa, Colorado and Utah  

E-print Network

Chenopookum Crrsium Cleome CucurhIta Datura Descuraima Hehanthus Lyc rum Mirahura Oryxopsis Physahs Pmus SphaeralCea So lanum CHARCOAL Fraxmus Jumperus P I I1u s POpuluS Salrx Other Zea Mays Figure 4, Relative Frequencies of Species... Mirabilis Oryzopsis Ph'rsalis P I flux Pc pulus Sails SphaeralCea Sclanum Pxlus tea Mays Figure S. Percentage of Species Recovered Relative to Time 35 percentage of a given sample, adding all percentages from all samples from the mesa...

Chapman, Donna Ruth

2012-06-07

320

Thoughts Regarding the Dimensions of Faults at Rainier and Aqueduct Mesas, Nye County, Nevada, Based on Surface and Underground Mapping  

SciTech Connect

The geologic setting and history, along with observations through 50 years of detailed geologic field work, show that large-displacement (i.e., greater than 30 meters of displacement) syn- to post-volcanic faults are rare in the Rainier Mesa area. Faults observed in tunnels and drill holes are mostly tight, with small displacements (most less than 1.5 meters) and small associated damage zones. Faults are much more abundant in the zeolitized tuffs than in the overlying vitric tuffs, and there is little evidence that faults extend downward from the tuff section through the argillic paleocolluvium into pre-Tertiary rocks. The differences in geomechanical characteristics of the various tuff lithologies at Rainier Mesa suggest that most faults on Rainer Mesa are limited to the zeolitic units sandwiched between the overlying vitric bedded tuffs and the underlying pre-Tertiary units (lower carbonate aquifer–3, lower clastic confining unit–1, and Mesozoic granite confining unit).

Drellack, S.L.; Prothro, L.B.; Townsend, M.J.; Townsend, D.R.

2011-02-01

321

Evaluation of the Junior MESA Program: A Report to the Legislature in Response to Assembly Bill 610 (Hughes) of 1985 [Commission Report 89-30].  

ERIC Educational Resources Information Center

The Mathematics, Engineering, Science Achievement (MESA) Program was established in 1970 to increase the number of American Indian, Black, Mexican-American, and Puerto Rican students who graduate from a California university prepared to enter mathematics-based careers. Developed initially with an exclusive focus on high school students, MESA

California State Postsecondary Education Commission, Sacramento.

322

4. OVERALL VIEW OF MINE SITE, SHOWING MINE CAR TRACKS, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. OVERALL VIEW OF MINE SITE, SHOWING MINE CAR TRACKS, SNOWSHEDS AND TIPPLE (LEFT BACKGROUND). VIEW TO EAST. - Park Utah Mining Company: Keetley Mine Complex, 1 mile East of U.S. 40 at Keetley, Heber City, Wasatch County, UT

323

INTERIM GEOLOGICAL INVESTIGATIONS IN THE U12b.08 TUNNEL, NEVADA TEST SITE, NYE COUNTY, NEVADA  

Microsoft Academic Search

The Ul2b.08 tunnel is a part of the Ul2b tunnel system, which was driven ; southwestward beneath Rainier Mesa in the northern part of the Nevada Test Site. ; The tunnel was driven in nonwelded vitric tuff of the Survey Butte Member of the ; Oak Spring Formation of Miocene(?) or younger age. Vertical and minimum cover ; over the

W. L. Emerick; F. N. Houser

1962-01-01

324

Attributes and characteristics of the Mathematics, Engineering, Science, Achievement (MESA) high school program for first-generation Latino students  

NASA Astrophysics Data System (ADS)

This study used a web-based survey collected data from 28 first-generation Latino engineers who participated in the Mathematics, Engineering, Science, Achievement (MESA) program during their high school years. From the set of 28 respondents, 5 volunteered to participate in an optional telephone interview. The purpose of this study was to describe the critical attributes and characteristics of the MESA program that lead to success at both the high school and college levels for first-generation Latino students. Success at the high school level was operationally defined as successfully graduating with a high school diploma. Success at the college level was operationally defined here as college graduation with an engineering degree. Using a mixed-methods technique, the researcher attempted to secure consensus of opinion from a sample population of 28 first-generation Latino engineers. The mixed-methods technique was chosen since it allowed the researcher to draw on the strengths of quantitative and qualitative approaches. According to the findings, the typical respondent felt that mentoring was the attribute of the MESA program that most prepared him to graduate from high school. The respondents felt that the following MESA attributes most helped them transition into an undergraduate engineering program: Academic and University Advising; Enrichment Activities; Career Advising; Field Trips; Mentoring; Scholarship Incentive Awards; and Speakers. The respondents viewed study groups as the MESA attribute that best prepared them to graduate college with an engineering degree. This study was purposefully designed as a descriptive study. Future research is required to extend this work into an evaluative study. This would allow for the generalization of the critical attributes to the general student population serviced by the MESA program.

Flores, Ramon

325

28. AERIAL VIEW LOOKING EAST AT THE WEST GATE IN ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

28. AERIAL VIEW LOOKING EAST AT THE WEST GATE IN 1978. SHOWN IS BUILDING 100, THE MAIN ENTRANCE POINT TO THE SITE FROM 1969 UNTIL 1985. DURING THIS TIME EACH AUTOMOBILE THAT ENTERED THE SITE WAS SEARCHED. IN 1985, BUILDING 120 WAS BUILT AT THE OUTERMOST WEST EDGE OF THE SITE. THERE WERE 29 FACILITIES AROUND THE SITE DEDICATED TO SECURITY (5/4/78). - Rocky Flats Plant, Bounded by Indiana Street & Routes 93, 128 & 72, Golden, Jefferson County, CO

326

British Museum: Middle East  

NSDL National Science Digital Library

This website from the British Museum lets visitors explore the Middle East in an online tour. The main page of the Middle East section allows the visitor to explore the Middle East via the themes of "Agatha Christie and archaeology", "The kingdoms of ancient South Arabia", "The Queen of Sheba", and "Iran before Islam: The Sasanians". After the visitor clicks on a theme, they will see thumbnails of artifacts to click on, which when chosen, will be accompanied by an explanation of the artifact. Related photos, drawings, charts, etc. may also appear below the photo of the artifact, and can be enlarged by clicking on it directly. Visitors should not miss the "Queen of Sheba" theme to see some works of art that have depicted this austere leader throughout recorded history.

327

The Effectiveness of the Mathematics, Engineering, Science Achievement (MESA) Program's Administrative and Policy-Making Processes. A Report to the Legislature in Response to Assembly Bill 610 (1985). Commission Report 89-4.  

ERIC Educational Resources Information Center

The Mathematics, Engineering, Science Achievement (MESA) Program was established in 1970 to increase the number of minority students in college programs. This paper reports the MESA administrative operations and policy-making processes. Part 1 summarizes the background of this study. Part 2 describes MESA's administrative operations and provides…

California State Postsecondary Education Commission, Sacramento.

328

Completion Report for Well ER-EC-11 Corrective Action Units 101 and 102: Central and Western Pahute Mesa  

SciTech Connect

Well ER-EC-11 was drilled for the U.S. Department of Energy, National Nuclear Security Administration Nevada Site Office, in support of the Nevada Environmental Restoration Project at the Nevada National Security Site (formerly Nevada Test Site), Nye County, Nevada. The well was drilled in September and October 2009 as part of the Pahute Mesa Phase II drilling program. A main objective was to investigate radionuclide migration down-gradient from Well Cluster ER-20-5 and Well ER-20-7 and across the northern Timber Mountain moat structural zone into the area referred to as the Bench, between Pahute Mesa and the Timber Mountain caldera complex. A secondary purpose of the well was to provide detailed hydrogeologic information for the shallow- to intermediate-depth Tertiary volcanic section in the Bench area. This well also provided detailed hydrogeologic information in the Tertiary volcanic section to reduce uncertainties within the Pahute Mesa-Oasis Valley hydrostratigraphic framework model (Bechtel Nevada, 2002). The main 52.1-centimeter hole was drilled to a depth of 507.5 meters and then opened to a diameter of 66.0 centimeters. It was cased with 50.8-centimeter casing to 504.9 meters. The hole diameter was then decreased to 47.0 centimeters, and drilling continued to a total depth of 979.3 meters. It was then cased with 34.0-centimeter casing set at 965.5 meters. The hole diameter was then decreased to 31.1 centimeters and the borehole was drilled to a total depth of 1,264.3 meters. The completion casing string, set to the depth of 1,262.5 meters, consists of 19.4-centimeter stainless-steel casing hanging from 19.4-centimeter carbon-steel casing. The stainless-steel casing has two slotted intervals open to the Tiva Canyon and Topopah Spring aquifers. Four piezometer strings were installed in Well ER-EC-11. A string of carbon-steel 6.0-centimeter tubing with one slotted interval was inserted outside the 50.8-centimeter casing, within the 66.0-centimeter borehole for access to the Timber Mountain aquifer, and landed at 475.3 meters. A second string of 6.0-centimeter tubing with one slotted interval was inserted outside the 34.0-centimeter casing, within the 47.0-centimeter borehole for access to the Benham aquifer, and landed at 911.7 meters. A third piezometer string consists of 7.3-centimeter stainless-steel tubing that hangs from 6.0-centimeter carbon-steel tubing via a crossover sub. This string was landed at 1,029.5 meters to monitor the Tiva Canyon aquifer. The deepest string of 7.3-centimeter tubing was landed at 1,247.8 meters to monitor the Topopah Spring aquifer. Data collected during and shortly after hole construction include composite drill cuttings samples collected every 3.0 meters, 67 percussion gun and rotary sidewall core samples, various geophysical logs, fluid samples (for groundwater chemistry analysis and tritium measurements), and water-level measurements. The well penetrated 1,264.3 meters of Tertiary volcanic rock, including three saturated welded-tuff aquifers and one saturated lava-flow aquifer. A water level was measured in the Timber Mountain aquifer at 449.6 meters, during open-hole geophysical logging on September 20, 2009. The fluid level measured after the total depth was reached and the upper aquifer was cased off was 450.0 meters when measured in the open borehole on October 17, 2009. Measurements on samples taken from the undeveloped well indicated that tritium levels averaging approximately 12,430 picocuries per liter (less than Safe Drinking Water Act levels) were encountered within the Benham aquifer. Tritium was below the minimum detectable activity concentration for samples collected from the Tiva Canyon aquifer and the Topopah Spring aquifer.

NSTec Environmental Management

2010-12-01

329

United States East Coast  

NASA Technical Reports Server (NTRS)

Snowy to the north and west and cloudy to the east, this MODIS image from February 28, 2002, shows the eastern U.S. Piedmont, a region of relatively low-lying, rolling plateau that runs between New Jersey to the north and Alabama to the south. Bounded on the west by the Appalachians and on the east by the Atlantic Coastal Plain, the Piedmont is fertile agricultural land, and appears to be greening up in (from bottom left) Georgia, South Carolina, and parts of North Carolina, while winter has left its snowy mark on West Virginia (left of center), and to the northeast in Pennsylvania, New York, and New England.

2002-01-01

330

29. SECOND FLOOR EAST SIDE APARTMENT EAST BEDROOM INTERIOR. ALUMINUMFRAME ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

29. SECOND FLOOR EAST SIDE APARTMENT EAST BEDROOM INTERIOR. ALUMINUM-FRAME SLIDING-GLASS WINDOWS ARE REPLACEMENTS. VIEW TO NORTHEAST. - Lee Vining Creek Hydroelectric System, Triplex Cottage, Lee Vining Creek, Lee Vining, Mono County, CA

331

35. EAST FRONT OF POWERHOUSE AND CAR BARN: East front ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

35. EAST FRONT OF POWERHOUSE AND CAR BARN: East front of powerhouse and car barn. 'Annex' is right end of building. - San Francisco Cable Railway, Washington & Mason Streets, San Francisco, San Francisco County, CA

332

12. Detail from east river bank, showing east abutment and ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

12. Detail from east river bank, showing east abutment and pylons and truss geometry under roadway, looking upward and northeast - French King Bridge, Spanning Connecticut River on State Highway 2, Erving, Franklin County, MA

333

Detail east panel of east truss showing rollling panels and ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Detail east panel of east truss showing rollling panels and counter weights. View south - New York, New Haven & Hartford Railroad, Fort Point Channel Rolling Lift Bridge, Spanning Fort Point Channel, Boston, Suffolk County, MA

334

3. East side, details of north half of east web; ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. East side, details of north half of east web; also details of roadway, railing and overhead bracing; looking northeast - Dodd Ford Bridge, County Road 147 Spanning Blue Earth River, Amboy, Blue Earth County, MN

335

27. EAST (CANADIAN) APPROACH TO BRIDGE, FROM EAST ABUTMENT (LEFT). ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

27. EAST (CANADIAN) APPROACH TO BRIDGE, FROM EAST ABUTMENT (LEFT). VIEW TO NORTHWEST. - Blue Water Bridge, Spanning St. Clair River at I-69, I-94, & Canadian Route 402, Port Huron, St. Clair County, MI

336

24. EAST (CANADIAN) APPROACH TO BRIDGE, LOOKING TOWARD EAST ABUTMENT. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

24. EAST (CANADIAN) APPROACH TO BRIDGE, LOOKING TOWARD EAST ABUTMENT. VIEW TO NORTHEAST. - Blue Water Bridge, Spanning St. Clair River at I-69, I-94, & Canadian Route 402, Port Huron, St. Clair County, MI

337

VIEW EAST, EAST ELEVATION OF ECCENTRIC HOUSE, NOTE ROD LINES ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

VIEW EAST, EAST ELEVATION OF ECCENTRIC HOUSE, NOTE ROD LINES EXITING THE BUILDING AND ROD LINES WITH SUPPORTS IN FOREGROUND LEFT. - South Penn Oil Company, G. M. Mead Lot 492 Lease, Morrison Run Field, Clarendon, Warren County, PA

338

INTERIOR VIEW OF EAST SIDE WALL AND DOOR, FACING EAST. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

INTERIOR VIEW OF EAST SIDE WALL AND DOOR, FACING EAST. - Douglas Aircraft Company Long Beach Plant, Aircraft Wing & Fuselage Assembly Building, 3855 Lakewood Boulevard, Long Beach, Los Angeles County, CA

339

2. EAST END PLANT 5 POWERHOUSE AND EAST TAILRACE. STONE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. EAST END PLANT 5 POWERHOUSE AND EAST TAILRACE. STONE RETAINING WALLS BEHIND POWERHOUSE DELINEATE FORMER RESIDENTIAL AREA. VIEW TO WEST ACROSS PLANT 6 INTAKE. - Bishop Creek Hydroelectric System, Plant 5, Bishop Creek, Bishop, Inyo County, CA

340

Digital Geologic Map of the Nevada Test Site and Vicinity, Nye, Lincoln, and Clark Counties, Nevada, and Inyo County, California  

USGS Publications Warehouse

This digital geologic map of the Nevada Test Site (NTS) and vicinity, as well as its accompanying digital geophysical maps, are compiled at 1:100,000 scale. The map compilation presents new polygon (geologic map unit contacts), line (fault, fold axis, metamorphic isograd, dike, and caldera wall) and point (structural attitude) vector data for the NTS and vicinity, Nye, Lincoln, and Clark Counties, Nevada, and Inyo County, California. The map area covers two 30 x 60-minute quadrangles-the Pahute Mesa quadrangle to the north and the Beatty quadrangle to the south-plus a strip of 7.5-minute quadrangles on the east side-72 quadrangles in all. In addition to the NTS, the map area includes the rest of the southwest Nevada volcanic field, part of the Walker Lane, most of the Amargosa Desert, part of the Funeral and Grapevine Mountains, some of Death Valley, and the northern Spring Mountains. This geologic map improves on previous geologic mapping of the same area (Wahl and others, 1997) by providing new and updated Quaternary and bedrock geology, new geophysical interpretations of faults beneath the basins, and improved GIS coverages. Concurrent publications to this one include a new isostatic gravity map (Ponce and others, 1999) and a new aeromagnetic map (Ponce, 1999).

Slate, Janet L.; Berry, Margaret E.; Rowley, Peter D.; Fridrich, Christopher J.; Morgan, Karen S.; Workman, Jeremiah B.; Young, Owen D.; Dixon, Gary L.; Williams, Van S.; McKee, Edwin H.; Ponce, David A.; Hildenbrand, Thomas G.; Swadley, W.C.; Lundstrom, Scott C.; Ekren, E. Bartlett; Warren, Richard G.; Cole, James C.; Fleck, Robert J.; Lanphere, Marvin A.; Sawyer, David A.; Minor, Scott A.; Grunwald, Daniel J.; Laczniak, Randell J.; Menges, Christopher M.; Yount, James C.; Jayko, Angela S.

1999-01-01

341

1 East Asian Languages and Literatures EAST ASIAN LANGUAGES AND  

E-print Network

://bulletin.gwu.edu/arts-sciences/east-asian- languages-literatures/ba-japanese) Minors · Minor in Chinese language and literature (http:// bulletin.gwu.edu/arts-sciences/east-asian-languages- literatures/minor-chinese) · Minor in Japanese language and literature (http:// bulletin.gwu.edu/arts-sciences/east-asian-languages- literatures/minor-japanese) · Minor in Korean language and literature (http:// bulletin.gwu.edu/arts-sciences/east-asian-languages

Vertes, Akos

342

Predicted Geology of the Pahute Mesa-Oasis Valley Phase II Drilling Initiative  

SciTech Connect

Pahute Mesa–Oasis Valley (PM-OV) Phase II drilling will occur within an area that encompasses approximately 117 square kilometers (45 square miles) near the center of the Phase I PM-OV hydrostratigraphic framework model area. The majority of the investigation area lies within dissected volcanic terrain between Pahute Mesa on the north and Timber Mountain on the south. This area consists of a complex distribution of volcanic tuff and lava of generally rhyolitic composition erupted from nearby calderas and related vents. Several large buried volcanic structural features control the distribution of volcanic units in the investigation area. The Area 20 caldera, including its structural margin and associated caldera collapse collar, underlies the northeastern portion of the investigation area. The southern half of the investigation area lies within the northwestern portion of the Timber Mountain caldera complex, including portions of the caldera moat and resurgent dome. Another significant structural feature in the area is the west-northwest-trending Northern Timber Mountain moat structural zone, which bisects the northern portion of the investigation area and forms a structural bench. The proposed wells of the UGTA Phase II drilling initiative can be grouped into four generalized volcanic structural domains based on the stratigraphic distribution and structural position of the volcanic rocks in the upper 1,000 meters (3,300 feet) of the crust, a depth that represents the approximate planned total depths of the proposed wells.

NSTec Environmental Restoration

2009-04-20

343

Constructing Mass-radius Relationships of Low Mass Gaseous Exoplanets with MESA  

NASA Astrophysics Data System (ADS)

To date, over 3500 exoplanets and planetary candidates have been discovered. This astonishing feat allows us to answer a cornerstone question in astronomy and planetary science: what are these 'other worlds' in the solar neighborhood like? Apart from characterization efforts based on observations, a good avenue to explore is to use computer simulations to model the planets' atmospheres and interiors under the influence of stellar irradiation. We present a prescription to extend the stellar evolution code MESA (Modules for Experimental Stellar Astrophysics) to model the thermal evolution of low mass exoplanets having hydrogen-helium envelopes. With the addition of routines treating the planet core luminosity, heavy element enrichment, and mass loss due to hydrodynamic winds, the evolutionary pathways of planets with diverse properties are accurately constrained. Using these dynamic models, we construct mass-radius relationships of planets from 1 to 300 MEarth with varying ages, energy flux received, envelope metallicity and opacity. These relations are benchmarked against previous theoretical studies and the current census of observed planets. In doing so, we demonstrate MESA's ability to incorporate these planetary phenomena in its 1D numerical computations. We anticipate that this versatile, user-friendly code will see widespread applications in complementing future exoplanetary surveys such as K-2, TESS, and PLATO.

Chen, Howard; Rogers, Leslie

2015-01-01

344

Exploration for uranium deposits in the Atkinson Mesa area, Montrose County, Colorado  

USGS Publications Warehouse

The U.S. Geological Survey explored the Atkinson Mesa area for uranium- and vanadium-bearing deposits from July 2, 1951, to June 18, 1953, with 397 diamond-drill holes that totaled 261,251 feet. Sedimentary rocks of Mesozoic age are exposed in the Atkinson Mesa area. They are: the Brushy Basin member of the Upper Jurassic Morrison formation, the Lower Cretaceous Burro Canyon formation, and the Upper and Lower Cretaceous Dakota sandstone. All of the large uranium-vanadium deposits discovered by Geological Survey drilling are in a series of sandstone lenses in the upper part of the Salt Wash member of the Jurassic Morrison formation. The deposits are mainly tabular and blanket-like, but some elongate pod-shaped masses, locally called "rolls" may be present. The mineralized material consists of sandstone impregnated with a uranium mineral which is probably coffinite, spme carnotite, and vanadium minerals, thought to be mainly corvusite and montroseite. In addition,, some mudstone and carbonaceous material is similarly impregnated. Near masses of mineralized material the sandstone is light gray or light brown, is generally over 40 feet thick, and usually contains some carbonaceous material and abundant disseminated pyrite or limonite stain. Similarly, the mudstone in contact with the ore-bearing sandstone near bodies of mineralized rock is commonly blue gray, as compared to its dominant red color away from ore deposits. Presence and degree of these features are useful guides in exploring for new deposits.

Brew, Daniel Allen

1954-01-01

345

Monitoring Volcanic Gases on Kilauea's East Rift Zone  

USGS Multimedia Gallery

Hawaiian Volcano Observatory Geochemist Jeff Sutton and CSAV international volcanology students visit a continuous gas monitoring site on Kilauea's east rift zone during field studies portion of the summer training course. Instrumentation at this site measures ambient concentration of noxious sulfur...

346

Monitoring Volcanic Gases on Kilauea's East Rift Zone II  

USGS Multimedia Gallery

Hawaiian Volcano Observatory Geochemist Jeff Sutton and CSAV international volcanology students visit a continuous gas monitoring site on Kilauea's east rift zone during field studies portion of the summer training course. Instrumentation at this site measures ambient concentration of noxious su...

347

10. VIEW OF BRIDGE, LOOKING EAST. THE EAST TOWER IS ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

10. VIEW OF BRIDGE, LOOKING EAST. THE EAST TOWER IS SEEN AT THE CENTER OF THE PHOTOGRAPH ON THE SKYLINE, AND THE EAST WALKWAY ABUTMENT IS SEEN AT THE LEFT OF THE VIEW. THE VERTICAL CABLE RUNS FROM THE EYEBOLT TO THE MAIN SUSPENSION CABLE SPACER. February 1987 - Verde River Sheep Bridge, Spanning Verde River (Tonto National Forest), Cave Creek, Maricopa County, AZ

348

4. Engine room, east end looking east toward engine #4 ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. Engine room, east end looking east toward engine #4 (Enterprise Diesel; reduction gear in foreground; in left rear, two D.C. generators with Ames Ironworks horizontal engine and sturtevant vertical engine - East Boston Pumping Station, Chelsea Street at Chelsea Creek, Boston, Suffolk County, MA

349

Test Well, East River  

USGS Multimedia Gallery

USGS test well 10 34h363 in the East River, Brunswick, Ga. The U.S. Geological Survey drilled this test well in the early 1970's and at the time it was on the edge of the marsh at Andrews Island. It is now only accessible by boat or canoe at high tide. Despite being surrounded by saltwater the artes...

350

Understanding the Middle East.  

ERIC Educational Resources Information Center

This nine-week unit on the Middle East for sixth graders was developed as part of a series by the Public Education Religion Studies Center at Wright State University. A major objective is to help students understand and appreciate sacred times and sacred places within this cultural setting. They learn how beliefs and practices cause the people to…

Owen, Evelyn C.

351

East Anglia Travel Plan  

E-print Network

University Of East Anglia Travel Plan #12;Contents Foreword, Professor David Eastwood, Vice of available building space whilst maintaining the quality of our surroundings. However, the volume of traffic and grow. There are many reasons to consider ways of reducing the number of cars that travel to and from

Everest, Graham R

352

Russian and East European Studies  

E-print Network

complementary for Russian, political science, economics, history, geography, journalism, global studiesRussian and East European Studies Certificate About Us The Russian and East European Studies (REES) Certificate program develops students' knowledge of the language, history, culture, and con- temporary

Saldin, Dilano

353

Middle East Respiratory Syndrome (MERS)  

MedlinePLUS

Middle East Respiratory Syndrome Coronavirus; MERS-CoV; Novel coronavirus; nCoV ... Middle East Respiratory Syndrome (MERS) is a severe respiratory illness. It causes fever, coughing, and shortness of breath. About 30% of ...

354

Ground-water, surface-water, and water-chemistry data, Black Mesa area, northeastern Arizona--2003-04  

USGS Publications Warehouse

The N aquifer is the major source of water in the 5,400-square-mile area of Black Mesa in northeastern Arizona. Availability of water is an important issue in this area because of continued industrial and municipal use, a growing population, and precipitation of about 6 to 14 inches per year. The monitoring program in the Black Mesa area has been operating since 1971 and is designed to determine the long-term effects of ground-water withdrawals from the N aquifer for industrial and municipal uses. The monitoring program includes measurements of (1) ground-water pumping, (2) ground-water levels, (3) spring discharge, (4) surface-water discharge, (5) ground-water chemistry, and (6) periodic testing of ground-water withdrawal meters. In 2003, total ground-water withdrawals were 7,240 acre-feet, industrial withdrawals were 4,450 acre-feet, and municipal withdrawals were 2,790 acre-feet. From 2002 to 2003, total withdrawals decreased by 10 percent, industrial withdrawals decreased by 4 percent, and municipal withdrawals decreased by 20 percent. Flowmeter testing was completed for 24 municipal wells in 2004. The median difference between pumping rates for the permanent meter and a test meter for all the sites tested was -2.9 percent. Values ranged from -10.9 percent at Forest Lake NTUA 1 to +7.8 percent at Rough Rock NTUA 2. From 2003 to 2004, water levels declined in 6 of 12 wells in the unconfined part of the aquifer, and the median change was -0.1 foot. Water levels declined in 7 of 11 wells in the confined part of the aquifer, and the median change was -2.7 feet. From the prestress period (prior to 1965) to 2003, the median water-level change for 26 wells was -23.2 feet. Median water-level change were -6.1 feet for 14 wells in the unconfined parts of the aquifer and and -72.1 feet for 12 wells in the confined part. Discharges were measured once in 2003 and once in 2004 at four springs. Discharge stayed the same at Pasture Canyon Spring, increased 9 percent at Moenkopi Spring, decreased 26 percent at an unnamed spring near Dennehotso, and decreased 50 percent at Burro Spring. For the past 12 years, discharges from the four springs have fluctuated; however, an increasing or decreasing trend is not apparent. Continuous records of surface-water discharge have been collected from 1976 to 2003 at Moenkopi Wash, 1996 to 2003 at Laguna Creek, 1993 to 2003 at Dinnebito Wash, and 1994 to 2003 at Polacca Wash. Median flows for November, December, January, and February of each water year were used as an index of ground-water discharge to those streams. Since 1995, the median winter flows have decreased for Moenkopi Wash, Dinnebito Wash, and Polacca Wash. Since the first continuous record of surface-water discharge in 1997, there is no consistent trend in the median winter flow for Laguna Creek. In 2004, water samples were collected from 12 wells and 4 springs and analyzed for selected chemical constituents. Dissolved-solids concentrations ranged from 100 to 649 milligrams per liter. Water samples from 11 of the wells and from all the springs had less than 500 milligrams per liter of dissolved solids. There are no appreciable time trends in the chemistry of water samples from 7 wells and 2 springs; increasing trends in dissolved-solids and chloride concentrations were evident from the more than 10 years of data for 2 springs.

Truini, Margot; Macy, Jamie P.; Porter, Thomas J.

2005-01-01

355

Use of east Texas reservoirs by wintering bald eagles  

E-print Network

Creek Reservoir dam in Henderson County in east Texas in January 1976, but it was in disrepair and blew down later that year. Nest'ing sites are currently concentrated between Refugio on the south and Orange on the north (in extreme southeastern Texas... Texas 65 LIST OF FIGURES Figure Page 1 The study area in east Texas following county lines . 2 The 8 major river basins within the study area 3 The major reservoirs within the study area in east Texas 15 16 4 The vegetational areas encompassing...

Russell, Sandra Joy

1982-01-01

356

14. VIEW LOOKING WEST AT THE EAST SIDE OF BUILDING ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

14. VIEW LOOKING WEST AT THE EAST SIDE OF BUILDING 81 UNDER CONSTRUCTION IN 1952. THE GROUND RISES IN ELEVATION TOWARD THE CENTER OF THE SITE FROM THE NORTH, EAST, AND SOUTH. BUILDINGS 71, 91, AND 81 WERE BUILT INTO HILLSIDES SO THAT IN THE EVENT OF A SOVIET ATTACK, ALL THREE PLANTS WOULD NOT BE DESTROYED (1952). - Rocky Flats Plant, Bounded by Indiana Street & Routes 93, 128 & 72, Golden, Jefferson County, CO

357

East Coast -Suez Canal 15 East Coast -Strait of Hormuz 24  

E-print Network

Bases Places Crossroads East Coast - Suez Canal 15 East Coast - Strait of Hormuz 24 East Coast deployed (Avg Last 90 Days) 8 Sep 14 ~190 ships #12;Bases Places Crossroads East Coast - Suez Canal 15 East

358

Faculty Position in East Africa  

E-print Network

Faculty Position in East Africa Carnegie Mellon University is embarking on an exciting opportunity to transform graduate education in East Africa by introducing new models of education, research and development.Striving to become the technology hub for East Africa,Rwanda is investing heavily in infrastructure and capacity

McGaughey, Alan

359

Coal petrographic genetic units in deltaic-plain deposits of the Campanian Mesa Verde Group (New Mexico, USA)  

E-print Network

stratigraphy; Coal; Maceral analysis; Microlithotype Abstract The Campanian rocks of the Mesa Verde Group. The results reveal the existence of internal sequences in the coal seam, corresponding to recurrent patterns of a palaeogeographical model proposed for a littoral domain. The authors interpret this coal sequence as the record

Paris-Sud XI, Université de

360

Common base amplifier with 7 - dB gain at 176 GHz in InP mesa DHBT technology  

NASA Technical Reports Server (NTRS)

We report a single stage tunded amplifier that exhibits 7 dB small signal gain at 176 GHz. Common Base topology is chosen as it has the best maximum stable gain (MSG) in this frequency band when compared to common emitter and common collector topologies. The amplifiers are designed and fabricated in InP mesa double heterojunction bipolar transistor (DHBT) technology.

Samoska, Lorene; Paidi, V.; Griffith, Z.; Dahlstrom, M.; Wei, Y.; Urteaga, M.; Rodell, M. J. W.; Fung, A.

2004-01-01

361

A neglected magma: constraining the volatile content and pre-eruptive conditions of the Peridot Mesa basanite  

Microsoft Academic Search

Peridot Mesa, famous for its xenoliths of spinel-bearing peridotite (Frey and Prinz, 1978) and gem quality peridot (Wrucke et al. 2004), is located in the Basin and Range province, near the San Carlos Reservation in south-eastern Arizona. While the literature abounds with studies of the mantle xenoliths, little is understood of the monogenetic eruption and basanitic lava that brought these

A. L. Gullikson; G. M. Moore; K. Roggensack

2010-01-01

362

The effect of dissolution of volcanic glass on the water chemistry in a tuffaceous aquifer, Rainier Mesa, Nevada  

USGS Publications Warehouse

Geochemistry of ground water associated with the Tertiary tuffs within Rainier Mesa, southern Nevada, was investigated to determine the relative importance of glass dissolution in controlling water chemistry. Water samples were obtained both from interstitial pores in core sections and from free-flowing fractures. Cation com- positions showed that calcium and magnesium decreased as a function of depth in the mesa, as sodium increased. The maximum effect occurs within alteration zones containing clinoptilolite and montmorillonite, suggesting these minerals effectively remove bivalent cations from the system. Comparisons are made between compositions of ground waters found within Rainier Mesa that apparently have not reacted with secondary minerals and compositions of waters produced by experimental dissolution of vitric and crystalline tufts which comprise the principal aquifers in the area. The two tuff phases have the same bulk chemistry but produce aqueous solutions of different chemistry. Rapid parabolic dissolution of sodium and silica from, and the retention of, potassium within the vitric phase verify previous predictions concerning water compositions associated with vitric volcanic rocks. Parabolic dissolution of the crystalline phase results in solutions high in calcium and magnesium and low in silica. Extrapolation of the parabolic dissolution mechanism for the vitric tuff to long times successfully reproduces, at com- parable pH, cation ratios existing in Rainier Mesa ground water. Comparison of mass- transfer rates of the vitric and crystalline tuffs indicates that the apparent higher glass-surface to aqueous-volume ratio associated with the vitric rocks may account for dominance of the glass reaction.

White, Art F.; Claassen, H.C.; Benson, Larry V.

1980-01-01

363

A COMPARISON OF THE MESA-PUGET SOUND OIL SPILL MODEL WITH WIND AND CURRENT OBSERVATIONS FROM AUGUST 1978  

EPA Science Inventory

This report compares the winds and currents observed in August, 1978 in the Strait of Juan de Fuca with simulated wind and current fields taken from the MESA-Puget Sound oil spill model. This model is described in a companion report, Pease (1980). A method is developed for relati...

364

Development of a StrengthsQuest-based Online Orientation Course for the Mathematics Engineering Science Achievement (MESA) Program  

NASA Astrophysics Data System (ADS)

MESA Programs have been established in over 30 community colleges in California. A critical component of the Program is the development of a course that helps new students in the community college and MESA environment to adjust to both college life and begin preparing for a professional career in the math- or science-based fields. To date, programs have developed an eclectic mix of courses to orient their students to their programs and to the college. This includes actual college courses that are credit or non-credit, usually 1 or 2 college units, as well as others that are offered only from within their MESA program that meet several times during the students’ first semester in the MESA Program. At College of the Desert (COD), a one unit orientation course was developed and approved by the Curriculum committee and was offered for the first time in Fall 2001. This class met once per week and consisted of several activities to help the student succeed and provided an opportunity for them to investigate future careers.. A StrengthsQuest assessment was added to this course in Fall 2004 and more and more of the course was impacted by the knowledge that the students gained about themselves from the assessment. One ongoing problem that was experienced with this course was scheduling a time so most of the new students could attend this important class at the beginning of their participation in the MESA Program. A pilot program to offer an online orientation course has been implemented at COD for the past two semesters that utilizes the StrengthsQuest as the initial student assessment and provides several experiences that build on those results. An outline of the components of the course will be presented and its potential will be discussed.

Farmer, J.

2009-12-01

365

East Asian Journal  

NASA Astrophysics Data System (ADS)

Astronomical research in Asian Pacific region has been growing rapidly in recent years. However, most important papers have been published in well established existing journals in US and Europe because we do not have high impact international journals in this region. I review the current trends of the local journals of East Asian countries and propose to establish a new regional journal by combining domestic journals.

Lee, Hyung Mok

2005-06-01

366

FINNIGAN WAY EAST BOULEVARD  

E-print Network

URRAY HILL ADELBERT C E D A R EUCLI D H EIGHTS EDGEHILL CORN ELL MAYFIELD PARK LANE E.107 E.105 E.101 ETrack SOUTH RESIDENTIAL VILLAGE Wyant Field House (Opens 2014) Triangle Apartments DIRECTORY A B C D E F G 1 2FINNIGAN WAY WADE PARK MAGNOLIA EAST BOULEVARD WA DE O VAL J E P T H A EASTBOULEVARD JUNIPE R FORD

Rollins, Andrew M.

367

Influenza in East Africa  

PubMed Central

Very little information is available concerning the frequency of influenza in East Africa. Following recent outbreaks of influenza in Uganda, that were due to the A2/Hong Kong/68 virus, it was considered useful to obtain information relating to the prevalence of infection due to this virus and to the current strain of influenza B virus, not only in Uganda but also in the neighbouring territories of Kenya and Tanzania. The results of serological testing of sera showed that widespread outbreaks of influenza A2/Hong Kong/68 infection had occurred recently in all three territories, while there was evidence of sporadic infection in all territories by the current influenza B strain. Despite the favourable climate of East Africa, it is evident that widespread outbreaks of influenza can occur, and these may arise during the period of the year when influenza is rare in countries with temperate climates. Influenza can easily spread to other countries via air travellers to and from East Africa. PMID:5312523

Montefiore, D.; Drozdov, S. G.; Kafuko, G. W.; Fayinka, O. A.; Soneji, A.

1970-01-01

368

East Asian observations  

NASA Astrophysics Data System (ADS)

East Asian observations are of established importance in Applied Historical Astronomy. The earliest astronomical records from this part of the world (China, Japan and Korea) originate from China. These observations, mainly of lunar eclipses, are recorded on oracle bones from the period ca. 1300 - 1050 BC. Virtually all later Chinese and other East Asian astronomical records now exist only in printed copies. The earliest surviving series of solar eclipse observations from any part of the world is contained in the Chunqiu (722 - 481 BC), a chronicle of the Chinese state of Lu. However, not until after 200 BC, with the establishment of a stable empire in China, do detailed astronomical records survive. These are mainly contained in specially compiled astrological treatises in the official dynastic histories. Such records, following the traditional style, extend down to the start of the present century. All classes of phenomena visible to the unaided eye are represented: solar and lunar eclipses, lunar and planetary movements among the constellations, comets, novae and supernovae, meteors, sunspots and the aurora borealis. Parallel, but independent series of observations are recorded in Japanese and Korean history, especially after about AD 800. Sources of Japanese records tend to be more diverse than their Chinese and Korean counterparts, but fortunately Kanda Shigeru (1935) and Ohsaki Shyoji (1994) have made extensive compilations of Japanese astronomical observations down to the 1860s. Throughout East Asia, dates were expressed in terms of a luni-solar calendar.

Stephenson, F. R.

369

The myosin mesa and a possible unifying hypothesis for the molecular basis of human hypertrophic cardiomyopathy.  

PubMed

No matter how many times one explores the structure of the myosin molecule, there is always something new to discover. Here, I describe the myosin mesa, a structural feature of the motor domain that has the characteristics of a binding domain for another protein, possibly myosin-binding protein C (MyBP-C). Interestingly, many well-known hypertrophic cardiomyopathy (HCM) mutations lie along this surface and may affect the putative interactions proposed here. A potential unifying hypothesis for the molecular basis of human hypertrophic cardiomyopathy is discussed here. It involves increased power output of the cardiac muscle as a result of HCM mutations causing the release of inhibition by myosin binding protein C. PMID:25619247

Spudich, James A

2015-02-01

370

Rectangular symmetrical mesa beams and their comparison with flattened Gaussian and multi-Gaussian beams  

NASA Astrophysics Data System (ADS)

A two-component analytical model describing 1D, paraxial, rectangular symmetrical mesa beams of arbitrary fractional orders is proposed. Such beams possess a plane wavefront and flat-topped intensity profiles at their waists. It is shown that they are reasonably well matched with 1D flattened Gaussian and generalized multi-Gaussian beams described by more complicated models in the form of finite superpositions of an on-axis fundamental Gaussian mode mixed, respectively, either with on-axis, 1D, elegant Hermite-Gaussian modes of higher orders or with off-axis fundamental Gaussian modes. A procedure of exact optimization fitting, the main propagation characteristics and the modal content of all the above beams are considered in detail. The proposed model is shown to have the most compact and convenient mathematical description of the beams and their characteristics.

Sedukhin, Andrey G.

2015-01-01

371

Core drilling provides information about Santa Fe Group aquifer system beneath Albuquerque's West Mesa  

USGS Publications Warehouse

Core samples from the upper ???1500 ft of the Santa Fe Group in the Albuquerque West Mesa area provide a first-hand look at the sediments and at subsurface stratigraphic relationships in this important part of the basin-fill aquifer system. Two major hydrostratigraphic subunits consisting of a lower coarse-grained, sandy interval and an overlying fine-grained, interbedded silty sand and clay interval lie beneath the water table at the 98th St core hole. Borehole electrical conductivity measurements reproduce major textural changes observed in the recovered cores and support subsurface correlations of hydrostratigraphic units in the Santa Fe Group aquifer system based on geophysical logs. Comparison of electrical logs from the core hole and from nearby city wells reveals laterally consistent lithostratigraphic patterns over much of the metropolitan area west of the Rio Grande that may be used to delineate structural and related stratigraphic features that have a direct bearing on the availability of ground water.

Allen, B.D.; Connell, S.D.; Hawley, J.W.; Stone, B.D.

1998-01-01

372

Radioelements and their occurrence with secondary minerals in heated and unheated tuff at the Nevada Test Site  

Microsoft Academic Search

Samples of devitrified welded tuff near and away from the site of a heater test in Rainier Mesa were examined with regard to whole-rock radioelement abundances, microscopic distribution of U, and oxygen isotope ratios. Wholerock U averages between 4 and 5 ppM, and U is concentrated at higher levels secondary opaque minerals as well as in accessory grains. U in

S. Flexser; H. A. Wollenberg

1992-01-01

373

Oceanography of East Madagascar  

NASA Astrophysics Data System (ADS)

During six week survey (August - September 2008) in Southern and Eastern coast of Madagascar, the R/V 'Dr. Fridtjof Nansen' has carried out a study of the pelagic ecosystem. In collaboration with Agulhas & Somali Current Large Marine Ecosystems project (ASCLME) and South West Indian Ocean Fisheries Project (SWIOFP), the aim of the survey was to establish the physical, chemical and biological characteristics of the Western Madagascar shelf region as a whole. A total of 102 CTD stations were conducted along selected hydrographical transects and ranged to a maximum of 3000 m depth. Water samples were also collected with Niskin bottles at predefined depths. A Seabird 911plus CTD was used to obtain vertical profiles of temperature, salinity and oxygen. As results, the first section between latitude 25o-26oS showed sea surface temperature values ranging between 25oC to 15oC upper 250m depth. As part of the south-west, the shelf is narrow and widen slightly along the tip south of the Island coast. In contrast of the west coast, in all transects performed along the south and the east coast, in most cases, the isotherms showed non stratified waters from the coast to offshore. The presence of the upwelling system in the south-east coast modifies drastically the patterns of all measured parameters. Fluorescence had a maximum values (0.25 µg/l) at surface near the coast in 2nd to 5th transects. Inversely, low temperature values were observed along the south and south-east with minimum values in the range of 18. 5oC-11oC at 50-250 m depth. These conditions were consistent along and between the 2nd to 5th transects, with more variation observed at transect 5. The salinity values (5 m depth) decreased from 35.7 psu in the south to 34.5 psu in the east. The horizontal distribution of oxygen showed non homogenous conditions with values between 5 ml/l (south) and 2.5 ml/l (south-east). Also starting from the coast to offshore, surface temperatures and surface salinities, surface fluorescence and dissolved oxygen showed non homogenous patterns.

Bemiasa, John

2014-05-01

374

Naturally weathered feldspar surfaces in the Navajo Sandstone aquifer, Black Mesa, Arizona: Electron microscopic characterization  

USGS Publications Warehouse

Naturally weathered feldspar surfaces in the Jurassic Navajo Sandstone at Black Mesa, Arizona, was characterized with high-resolution transmission and analytical electron microscope (HRTEM-AEM) and field emission gun scanning electron microscope (FEG-SEM). Here, we report the first HRTEM observation of a 10-nm thick amorphous layer on naturally weathered K-feldspar in currently slightly alkaline groundwater. The amorphous layer is probably deficient in K and enriched in Si. In addition to the amorphous layer, the feldspar surfaces are also partially coated with tightly adhered kaolin platelets. Outside of the kaolin coatings, feldspar grains are covered with a continuous 3-5 ??m thick layer of authigenic smectite, which also coats quartz and other sediment grains. Authigenic K-feldspar overgrowth and etch pits were also found on feldspar grains. These characteristics of the aged feldspar surfaces accentuate the differences in reactivity between the freshly ground feldspar powders used in laboratory experiments and feldspar grains in natural systems, and may partially contribute to the commonly observed apparent laboratory-field dissolution rate discrepancy. At Black Mesa, feldspars in the Navajo Sandstone are dissolving at ???105 times slower than laboratory rate at comparable temperature and pH under far from equilibrium condition. The tightly adhered kaolin platelets reduce the feldspar reactive surface area, and the authigenic K-feldspar overgrowth reduces the feldspar reactivity. However, the continuous smectite coating layer does not appear to constitute a diffusion barrier. The exact role of the amorphous layer on feldspar dissolution kinetics depends on the origin of the layer (leached layer versus re-precipitated silica), which is uncertain at present. However, the nanometer thin layer can be detected only with HRTEM, and thus our study raises the possibility of its wide occurrence in geological systems. Rate laws and proposed mechanisms should consider the possibility of this amorphous layer on feldspar surface. ?? 2006 Elsevier Inc. All rights reserved.

Zhu, C.; Veblen, D.R.; Blum, A.E.; Chipera, S.J.

2006-01-01

375

High resolution seismic imaging of Rainier Mesa using surface reflection and surface to tunnel tomography  

SciTech Connect

In the interpretation of seismic data to infer properties of an explosion source, it is necessary to account for wave propagation effects. In order to understand and remove these propagation effects, it is necessary to have a model. An open question concerning this matter is the detail and accuracy which must be present in the velocity model in order to produce reliable estimates in the estimated source properties. While it would appear that the reliability of the results would be directly related to the accuracy of the velocity and density models used in the interpretation, it may be that certain deficiencies in these models can be compensated by the and amount of seismic data which is used in the inversion. The NPE provided an opportunity to test questions of this sort. In August 1993, two high resolution seismic experiments were performed in N-Tunnel and on the surface of Rainier Mesa above it. The first involved a surface-to-tunnel imaging experiment with sources on the surface and receivers in tunnel U12n.23 about 88 meters west of the NPE. It was possible to estimate the apparent average velocity between the tunnel and the surface. In a separate experiment, a high resolution reflection experiment was performed in order to image the lithology in Rainier Mesa. Good quality, broad band, reflections were obtained from depths extending into the Paleozoic basement. A high velocity layer near the surface is underlain by a thick section of low velocity material, providing a nonuniform but low average velocity between the depth of the NPE and the surface.

Majer, E.L.; Johnson, L.R.; Karageorgi, E.K.; Peterson, J.E.

1994-06-01

376

4. CONTEXTUAL VIEW OF DITCH OVERLOOKING THE GOULD RANCH SITE, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. CONTEXTUAL VIEW OF DITCH OVERLOOKING THE GOULD RANCH SITE, HIGHWAY 50'S OVERPASS FOR THE R/R & OLD PLACERVILLE ROAD ON LEFT. EAST BIDWELL STREET APPROACHES TO HIGHWAY 50 ON RIGHT; VIEW TO SOUTH. - Keefe-McDerby Mine Ditch, East of East Bidwell Street between Clarksville Road & Highway 50, Folsom, Sacramento County, CA

377

1884, 1889 & 1893 Site Maps Brookland Site Development ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1884, 1889 & 1893 Site Maps - Brookland Site Development Study, Brookland, bounded by B&O Railroad Tracks, Rhode Island & Brentwood Avenues on the south, 18th Street & South Dakota Avenue on the east, and Michigan Avenue on the North, Washington, District of Columbia, DC

378

1863, 1880 & 1884 Site Maps Brookland Site Development ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1863, 1880 & 1884 Site Maps - Brookland Site Development Study, Brookland, bounded by B&O Railroad Tracks, Rhode Island & Brentwood Avenues on the south, 18th Street & South Dakota Avenue on the east, and Michigan Avenue on the North, Washington, District of Columbia, DC

379

Hydrologic Data for the Groundwater Flow and Contaminant Transport Model of Corrective Action Units 101 and 102: Central and Western Pahute Mesa, Nye County, Nevada, Revision 0  

SciTech Connect

This report documents the analysis of the available hydrologic data conducted in support of the development of a Corrective Action Unit (CAU) groundwater flow model for Central and Western Pahute Mesa: CAUs 101 and 102.

Drici, Warda

2004-02-01

380

Contaminant Transport Parameters for the Groundwater Flow and Contaminant Transport Model of Corrective Action Units 101 and 102: Central and Western Pahute Mesa, Nye County, Nevada, Revision 0  

SciTech Connect

This report documents the analysis of the available transport parameter data conducted in support of the development of a Corrective Action Unit (CAU) groundwater flow model for Central and Western Pahute Mesa: CAUs 101 and 102.

Drici, Warda

2003-08-01

381

A study of the mineralogy and lithology of cuttings from the U.S. Bureau of Reclamation MESA 6-2 Drillhole, Imperial County, California, including comparisons with MESA 6-1 Drillhole  

USGS Publications Warehouse

The Mesa 6-2 drillhole penetrates 6,000 feet of sediments in Imperial County, California. The cuttings material from the upper part of the drillhole is chiefly unconsolidated mud and silt. Soft siltstone fragments occur at about 1,400 feet and increase in amount down to 2,400 feet. Some pebbles are found above 2,400 feet, but the pebble-rich horizons are less distinctive than the pebble zone in the Mesa 6-1 drillhole. Below 2,400 feet, cuttings ape composed of about two-thirds siltstone and one-third sandstones, ranging from very fine to very coarse sand, plus loose Sand grains. Although below 2,400 feet there is no systematic change in color of siltstones, grain size, or cementation with depth, horizons composed predominantly of loose sand are more common at deeper levels. Fragments of igneous and metamorphic rocks are less common than in the Mesa 6-1 drillhole. Quartz, calcite, K-feldspar, plagioclase (albite), illite, and mixed layer clays are identified by X-ray diffractograms of whole-rock samples throughout the hole. Chlorite occurs in all samples from below 2,100 feet, and probably also occurs at shallower depths. In most siltstones, montmorillonite occurs only down to the interval 2,200-2,300 feet, but in the buff siltstone it is found to the bottom of the drillhole. Kaolinite occurs at least down to 4,700 feet. Dolomite is found down to at least 5,970 feet, but is generally absent from horizons composed mostly of loose sand. Pyrite occurs in many samples. No zeolites, ankerite, or amorphous sulfur were detected. Theme is no horizon that may be used fop conclusive correlation with the Mesa 6-1 drillhole.

Fournier, R.B.

1976-01-01

382

Radiological survey and evaluation of the fallout area from the Trinity test: Chupadera Mesa and White Sands Missile Range, New Mexico  

SciTech Connect

Current radiological conditions were evaluated for the site of the first nuclear weapons test, the Trinity test, and the associated fallout zone. The test, located on White Sands Missile Range, was conducted as part of the research with nuclear materials for the World War II Manhattan Engineer District atomic bomb project. Some residual radioactivity attributable to the test was found in the soils of Ground Zero on White Sands Missile Range and the areas that received fallout from the test. The study considered relevant information including historical records, environmental data extending back to the 1940s, and new data acquired by field sampling and measurements. Potential exposures to radiation were evaluated for current land uses. Maximum estimated doses on Chupadera Mesa and other uncontrolled areas are less than 3% of the DOE Radiation Protection Standards (RPSs). Radiation exposures during visits to the US Army-controlled Ground Zero area are less than 1 mrem per annual visit or less than 0.2% of the RPS for a member of the public. Detailed data and interpretations are provided in appendixes. 14 figs., 45 tabs.

Hansen, W.R.; Rodgers, J.C.

1985-06-01

383

Tropospheric ozone in east Asia  

SciTech Connect

An analysis of the observed data for the tropospheric ozone at mid latitudes in east Asia is done. There are three ways by which the tropospheric ozone is calculated, namely: (1) Ozonesonde measurements, (2) Fishman`s method of Residual Ozone and (3) TOMS measurements - an indirect method of calculating tropospheric ozone. In addition the surface ozone values at the network sites in Japan is also considered. The analysis of data is carried out for a period of twelve years from 1979 to 1991. In general it is observed that the tropospheric ozone is more in summer than winter, obviously because of the larger tropopause height in summer. On an average for the period of the analysis, the ozone values are at a high of about 60 DU (dobson units). While in winter the values go down to around 30 DU. Also a time series analysis shows an increasing trend in the values over the years. The ozonesonde values are correlated more to the TOMS tropospheric ozone values. For the stations analyzed in Japan, the TOMS tropospheric ozone values are generally greater than the ozonesonde values. The analysis of the average monthly surface ozone in Japan shows highs in spring and lows in summer. This can be attributed to movement of pollutant laden fronts towards Japan during spring. The highs for surface ozone are about 50 DU while the lows are around 20 DU.

Phadnis, M.J. [Univ. of Iowa, Iowa City, IA (United States)

1996-12-31

384

VIEW SOUTHWEST, NORTH AND EAST SIDE OF OFFICE BUILDING, EAST ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

VIEW SOUTHWEST, NORTH AND EAST SIDE OF OFFICE BUILDING, EAST SIDE OF FOSTER HANGAR AND FRANCIS HANGAR, AND NORTH SIDE OF DAVIS HANGAR AND METAL STORAGE HANGAR - Capital City Airport, Francis Aviation, North side of Grand River Avenue, Lansing, Ingham County, MI

385

Surface Characterization of 3C-SiC Mesa Heterofilms: Evidence for Growth by Edge/Corner Nucleation Mechanism  

NASA Technical Reports Server (NTRS)

This paper presents the first detailed observations of unique surface morphologies of 3C-Sic films grown on 4W6H-SIC mesas by the step-free surface heteroepitaxy technique. The top surfaces of 3C-Sic films were extensively studied by optical microscopy and atomic force microscopy (AFM) as both film thickness (i.e,, growth time) and growth temperature (i.e., terrace nucleation rate) were varied following complete coverage of each 4W6H mesa by an initial 3C-Sic film. Almost all surface steps observed by AFM were 0.25 nm, the height of a single Si-C bilayer. However, strikingly different step patterns were observed, suggesting that radically different processes dominate the nucleation of new 3C-Sic bilayers on top of existing 3C-Sic film surfaces.

Trunek, Andrew J.; Neudeck, Philip G.; Spry, David J.; Powell, J. Anothny

2003-01-01

386

Large-area broad band saturable Bragg reflectors using oxidized AlAs in the circular and inverted mesa geometries  

NASA Astrophysics Data System (ADS)

A semiconductor Saturable Bragg Reflector (SBR) is a mirror structure comprising alternating layers of high and low refractive index materials with an incorporated saturable absorber. SBRs can be used to initiate and sustain ultra-short pulses in various laser systems. In order to form ultra-short pulses, SBRs with high reflectivity over a broad wavelength range are required. Furthermore, large-area SBRs facilitate easy integration in a laser cavity. One of the key elements for the realization of broad band SBRs is the development of the thermal oxidation process that creates buried low-index AlxOy layers over large areas. The design, fabrication, characterization, and implementation of broad band, high index contrast III-V/AlxOy SBRs in the form of circular mesas, as well as inverted mesa structures, is presented.

Nabanja, Sheila P.; Kolodziejski, Leslie A.; Petrich, Gale S.; Sander, Michelle Y.; Morse, Jonathan L.; Shtyrkova, Katia; Ippen, Erich P.; Kärtner, Franz X.

2013-04-01

387

East Tennessee Technology Park 3-1 3. East Tennessee Technology Park  

E-print Network

East Tennessee Technology Park 3-1 3. East Tennessee Technology Park ETTP was originally built to the East Tennessee Technology Park. Environmental management and remediation operations consist the "East Tennessee Technology Park" to

Pennycook, Steve

388

United Nations Transitional Administration in East Timor: UNTAET  

NSDL National Science Digital Library

This new site from the United Nations offers a large collection of primary documents related to the history and future of East Timor. A June 11, 1999 Security Council Resolution (1246) established the United Nations Mission in East Timor (UNAMET), which is charged with organizing and conducting a "popular consultation" (scheduled for August 8) to determine the territory's future status. At the site, users can read the full text of the agreement between Indonesia and Portugal that set the groundwork for this consultation, as well as the official UN documents concerning East Timor (reports, resolutions, discussions), press briefings and releases (1996-99). Fifteen audio reports from UN Radio are also provided, although several were unavailable at time of writing.

389

3. East and north elevations, facing southwest (Note: B/W scale ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. East and north elevations, facing southwest (Note: B/W scale on east elevation in 1/2 ft increments) - Nevada Test Site, Reactor Maintenance & Disassembly Complex, Junior Hot Cell, Jackass Flats, Area 25, South of intersection of Roads F & G, Mercury, Nye County, NV

390

Diarrhoea and effects of different water sources, sanitation and hygiene behaviour in East Africa  

Microsoft Academic Search

published studies on domestic water use and environmental health in East Africa, based on direct observations or other reliable research methods. The objective of this study was to carry out a repeat analysis of domestic water use and environmental health in East Africa based on DOW I. The study was conducted in the same sites as DOW I. Field assistants

James K. Tumwine; John Thompson; Munguti Katua-Katua; Mark Mujwajuzi; Nick Johnstone; Elizabeth Wood; Ina Porras

2002-01-01

391

Biogeochemical cycles of Fe and Mn in the southwestern East Sea (Sea of Japan)  

Microsoft Academic Search

Biogeochemical cycles of Fe and Mn were studied for the southwestern East Sea (Sea of Japan) with a particular emphasis on the early diagenetic processes occurring in the upper part of sediments. In a cruise on October, 1995, we obtained 6 box core sediments from the southwestern part of the East Sea. The sampling sites cover continental slope areas and

H. Cha; C. Lee; B. Kim

2003-01-01

392

Effects of Wildfires on Riparian Restoration Sites  

E-print Network

, Limestone Canyon and East Cedar Creek, on the White Mountain Apache Reservation in Arizona starting. Prior to the fire, the geology and geomorphology of the East Cedar Creek site had facilitated luxuriant-central Arizona. The fire burned throughout the watershed of Limestone Canyon, including the treated reach itself

393

High external efficiency (36 percent) 5-micron mesa isolated GaAs quantum well laser by organometallic vapor phase epitaxy  

Microsoft Academic Search

High external power efficiencies of 36 percent are obtained from 5-micron mesa isolated graded-index separate-confinement heterostructure single quantum well lasers grown by organometallic vapor phase epitaxy. Threshold currents of 21 mA are reported for a 5 x 96 micron cavity laser with differential quantum efficiencies of as high as 80 percent at 6 mW\\/facet. In addition, high facet power densities

D. F. Welch; C. F. Schaus; J. R. Shealy

1985-01-01

394

Thoughts Regarding the Dimensions of Faults at Rainier and Aqueduct Mesas, Nye County, Nevada, Based on Surface and Underground Mapping  

Microsoft Academic Search

The geologic setting and history, along with observations through 50 years of detailed geologic field work, show that large-displacement (i.e., greater than 30 meters of displacement) syn- to post-volcanic faults are rare in the Rainier Mesa area. Faults observed in tunnels and drill holes are mostly tight, with small displacements (most less than 1.5 meters) and small associated damage zones.

S. L. Drellack; L. B. Prothro; M. J. Townsend; D. R. Townsend

2011-01-01

395

Travelers in the Middle East Archive  

NSDL National Science Digital Library

As Edward Said demonstrated in his landmark work, Orientalism, the ways in which the Middle East has been represented by outsiders (particularly those in the West) has had a tremendous influence on how this region of the world has been viewed by others. For anyone with an interest in Western interactions with the Middle East, this fascinating and engaging online digital archive includes travel guides written by Western visitors, photographic and hand-drawn images of Egypt, and some interactive GIS maps of both Egypt and Cyprus. With funding from the Institute of Museum and Library Services, the Travelers in the Middle East Archive (TIMEA) includes over 15,000 pages of text, 800 images, and 150 historical maps. Visitors with an interest in how such projects are created and maintained will also appreciate their papers and presentations section, which includes pieces on their work. Along with other materials included here, one of the highlights of the site must certainly be a first-hand account of travels through Palestine and environs written by H. Rider Haggard, who is probably best known for his series of late 19th century adventure novels set in Africa.

396

Some cooperative activities in East Asia  

NASA Astrophysics Data System (ADS)

We report the activity of continued and sequential cooperation among Asian countries/regions, especially in East Asia. Such efforts started in 1990 from a small-size China-Korea-Japan meeting on starforming regions. Being aware of the importance of cooperation among those neighboring countries, participants agreed to hold sequential "East Asian Meetings for Astronomy (EAMA)". The 1992 meeting entitled "Millimeter-Wave and Infrared Astronomy" was held in Japan, and the 1999 meeting entitled "Observational Astrophysics in Asia and its Future" was held in China. These meetings achieved quite high activity with 100-200 participants, each. An important product of those meetings was active exchange between young astronomers, including graduate students. The primary aim of these meetings/activities was to promote small but practical cooperation in the field of astronomical instrumentation, as well as to widen the contact among Asian astronomers. An East-Asian co-experiment to search for good sites for a possible "Asian Observatory" was among such efforts. The close cooperation between Japan, China (Peoples' Republic and Taipei) and Korea, on millimeter and sub-millimeter wave technology is another good example of joint developments of new instruments.

Kaifu, Norio

397

East Candor Chasma  

NASA Technical Reports Server (NTRS)

During its examination of Mars, the Viking 1 spacecraft returned images of Valles Marineris, a huge canyon system 5,000 km long, up to 240 km wide, and 6.5 km deep, whose connected chasma or valleys may have formed from a combination of erosional collapse and structural activity. The view shows east Candor Chasma, one of the connected valleys of Valles Marineris; north toward top of frame; for scale, the impact crater in upper right corner is 15 km (9 miles) wide. The image, centered at latitude 7.5 degrees S., longitude 67.5 degrees, is a composite of Viking 1 Orbiter high-resolution (about 80 m/pixel or picture element) images in black and white and low-resolution (about 250 m/pixel) images in color. The Viking 1 craft landed on Mars in July of 1976.

East Candor Chasma occupies the eastern part of the large west-northwest-trending trough of Candor Chasma. This section is about 150 km wide. East Candor Chasma is bordered on the north and south by walled cliffs, most likely faults. The walls may have been dissected by landslides forming reentrants; one area on the north wall shows what appears to be landslide debris. Both walls show spur-and-gully morphology and smooth sections. In the lower part of the image northwest-trending, linear depressions on the plateau are younger graben or fault valleys that cut the south wall.

Material central to the chasma shows layering in places and has been locally eroded by the wind to form flutes and ridges. These interior layered deposits have curvilinear reentrants carved into them, and in one locale a lobe flows away from the top of the interior deposit. The lobe may be mass-wasting deposits due to collapse of older interior deposits (Lucchitta, 1996, LPSC XXVII abs., p. 779- 780); this controversial idea requires that the older layered deposits were saturated with ice, perhaps from former lakes, and that young volcanism and/or tectonism melted the ice and made the material flow.

1997-01-01

398

East German women in management  

Microsoft Academic Search

Purpose – To address the research gap on East German women managers and to examine some of the experiences of post-socialist East German women who entered management positions during 1990s. The discussion focuses on the nature of women's commitment to career and organisation. Design\\/methodology\\/approach – The study presented adopts a methodology based on a qualitative approach, the grounded theory approach

Katja Loderstedt

2005-01-01

399

18. View from East Rock, c. 1920 Photocopied from a ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

18. View from East Rock, c. 1920 Photocopied from a print from glass negative no. 6476 by Thomas S. Bronson, NHCHSL. An aerial view of the armory site evidently after the row of stone houses for married employees had been torn down. - Eli Whitney Armory, West of Whitney Avenue, Armory Street Vicinity, Hamden, New Haven County, CT

400

OVERVIEW OF NUCLEAR PHYSICS LABORATORY (IMMEDIATELY EAST OF SPSE REACTOR ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

OVERVIEW OF NUCLEAR PHYSICS LABORATORY (IMMEDIATELY EAST OF SP-SE REACTOR ROOM), LEVEL -15?, LOOKING SOUTHWEST. NOTE SLIDING STEEL PLATE DOOR BETWEEN LABORATORY AND REACTOR ROOM - Physics Assembly Laboratory, Area A/M, Savannah River Site, Aiken, Aiken County, SC

401

A Plio-Pleistocene hominid from Dmanisi, East Georgia, Caucasus  

Microsoft Academic Search

ARCHAEOLOGICAL excavations at the mediaeval site of Dmanisi (East Georgia) revealed that the town was built on a series of deposits yielding Late Villafranchian mammalian fossils and led to the discovery in late 1991 of a well preserved early human mandible. Dmanisi, where excavations are being carried out by a joint expedition of the Archaeological Research Centre of the Georgian

L. Gabunia; A. Vekua

1995-01-01

402

1. VIEW OF SILVER CITY WITH EAST SIDE OF FLORIDA ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. VIEW OF SILVER CITY WITH EAST SIDE OF FLORIDA MOUNTAIN IN BACKGROUND. CAMERA POINTED WEST. (THE SNOW BANK IN THE SADDLE SERVES AS AN ORIENTATION/RELATIONSHIP POINT AND IS INCLUDED IN PHOTOGRAPH ID-31-G-1.) - Florida Mountain Mining Sites, Silver City, Owyhee County, ID

403

17. INTERIOR VIEW TO THE EAST OF ROOM 215, A ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

17. INTERIOR VIEW TO THE EAST OF ROOM 215, A SECOND FLOOR OFFICE ABOVE ROOM 137 IN THE COLD ASSEMBLY AREA. - Nevada Test Site, Reactor Maintenance Assembly & Dissassembly Facility, Area 25, Jackass Flats, Junction of Roads F & G, Mercury, Nye County, NV

404

20. INTERIOR VIEW TO THE EAST OF THE ACCESS RAMP ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

20. INTERIOR VIEW TO THE EAST OF THE ACCESS RAMP TO THE HOT DISASSEMBLY AREA FROM THE COLD ASSEMBLY AREA. - Nevada Test Site, Reactor Maintenance Assembly & Dissassembly Facility, Area 25, Jackass Flats, Junction of Roads F & G, Mercury, Nye County, NV

405

17. Photocopy of photograph. VIEW OF WORKERS IN EAST OPERATING ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

17. Photocopy of photograph. VIEW OF WORKERS IN EAST OPERATING GALLERY USING MANIPULATOR ARMS AT STATION E-108. Photographer unknown, ca. 1965, original photograph and negative on file at the Remote Sensing Laboratory, Department of Energy, Nevada Operations Office. - Nevada Test Site, Engine Maintenance Assembly & Disassembly Facility, Area 25, Jackass Flats, Mercury, Nye County, NV

406

13. VIEW OF EAST OPERATING GALLERY ALONG THE POSTMORTEM CELLS. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

13. VIEW OF EAST OPERATING GALLERY ALONG THE POST-MORTEM CELLS. A NUMBER OF MANIPULATOR ARMS COVERED WITH PLASTIC ARE ON THE LEFT WALL. - Nevada Test Site, Engine Maintenance Assembly & Disassembly Facility, Area 25, Jackass Flats, Mercury, Nye County, NV

407

9. Closeup of open doors on west elevation, facing east ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

9. Close-up of open doors on west elevation, facing east (Note: B/W scale in doorway is in 1/2 ft increments) - Nevada Test Site, Reactor Maintenance & Disassembly Complex, Junior Hot Cell, Jackass Flats, Area 25, South of intersection of Roads F & G, Mercury, Nye County, NV

408

VIEW OF EAST BANK OF ?SAFETY ROD PACKAGE,? INCLUDING SAFETY ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

VIEW OF EAST BANK OF ?SAFETY ROD PACKAGE,? INCLUDING SAFETY ROD MOTOR DRIVES (B AND C), DRUMS, AND CLUTCHES, IN A THREE-TIERED RACK IN THE PDP ROOM AT LEVEL +27?, LOOKING SOUTHEAST - Physics Assembly Laboratory, Area A/M, Savannah River Site, Aiken, Aiken County, SC

409

10. VIEW EAST (93 DEGREES) OF RCA COMMUNICATION RECEIVING STATION. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

10. VIEW EAST (93 DEGREES) OF RCA COMMUNICATION RECEIVING STATION. WOOD FRAMING SUPPORTED STANDOFF INSULATORS AND ANTENNA WIRES COMING FROM THE FIELD INTO THE BUILDING. BOLT ON FOUNDATION POLES SUPPORTED SATELLITE ANTENNAS, METAL CAP AND POSTS AT LEFT PROTECTED CONDUIT SUPPLYING POWER TO SATELLITE ANTENNA MOTORS. - Marconi Radio Sites, Receiving, Point Reyes Station, Marin County, CA

410

New Aerogeophysical exploration of the Gamburtsev Province (East Antarctica)  

Microsoft Academic Search

The enigmatic Gamburstev Subglacial Mountains (GSM) in the interior of East Antarctica, have remained the least understood mountain range on earth, since their discovery some 50 years ago. An improved knowledge of the GSM region is however essential to underpin reconstructions of the Antarctic cryosphere and climate evolution. The GSM are a key nucleation site for the inception of the

F. Ferraccioli; R. E. Bell; M. Studinger; D. Damaske; T. A. Jordan; H. Corr; D. A. Braaten; P. S. Gogineni; M. A. Fahnestock; C. Finn; K. Rose

2009-01-01

411

16. John and James Dobson Carpet Mill, East and West ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

16. John and James Dobson Carpet Mill, East and West parcels, site plan-right, and western environs, 1908. Smith, Elvino Victor. Atlas of the 38th and Part of the 37th Ward of the City of Philadelphia, Philadelphia, Pennsylvania: Elvino V. Smith, 1908, Plate 24. - John & James Dobson Carpet Mill (West Parcel), 4041-4055 Ridge Avenue, Philadelphia, Philadelphia County, PA

412

1. VIEW, LOOKING FROM THE EAST, OF THE GOLD KNOLL ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. VIEW, LOOKING FROM THE EAST, OF THE GOLD KNOLL SITE. MILL FOUNDATIONS ARE AT CENTER, WITH REMAINS OF THE TRESTLE ABOVE. WASTE DUMP FROM THE SHAFT IS AT LEFT - Gold Knoll Mill, Southern Edge of Salt Spring Valley, Copperopolis, Calaveras County, CA

413

34. LOW OBLIQUE AERIAL VIEW LOOKING EAST OVER THE FUTURE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

34. LOW OBLIQUE AERIAL VIEW LOOKING EAST OVER THE FUTURE SITE OF THE NAVAL SUPPLY CENTER TO DOWNTOWN OAKLAND. THE FEDERAL CHANNEL IS AT THE RIGHT. No date, probably mid 1930's. Clyde Sunderland, photographer. Original print on file at the Port of Oakland, California. - Oakland Harbor Training Walls, Mouth of Federal Channel to Inner Harbor, Oakland, Alameda County, CA

414

46. HISTORIC AERIAL VIEW LOOKING EAST AT THE REDSTONE TEST ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

46. HISTORIC AERIAL VIEW LOOKING EAST AT THE REDSTONE TEST SITE, SHOWING THE TEST STAND, SUPPORT EQUIPMENT, SERVICE AREA AND THE OBSERVATION TANKS BURIED BENEATH THE EARTH MOUND IN THE BACKGROUND. - Marshall Space Flight Center, Redstone Rocket (Missile) Test Stand, Dodd Road, Huntsville, Madison County, AL

415

6. INTERIOR VIEW TO THE EAST OF SOUTHEAST CORNER OF ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

6. INTERIOR VIEW TO THE EAST OF SOUTHEAST CORNER OF THE HOT BAY. A LARGE MANIPULATOR ARM AND HORIZONTAL TRACKING SYSTEM IS SHOWN ABOVE SMALLER MANIPULATOR ARM WORK STATIONS. ASSOCIATED WITH THE WORK STATIONS ARE OBSERVATION WINDOWS. - Nevada Test Site, Engine Maintenance Assembly & Disassembly Facility, Area 25, Jackass Flats, Mercury, Nye County, NV

416

East Pacific Rise: Hot Springs and Geophysical Experiments  

Microsoft Academic Search

Hydrothermal vents jetting out water at 380 degrees ± 30 degrees C have been discovered on the axis of the East Pacific Rise. The hottest waters issue from mineralized chimneys and are blackened by sulfide precipitates. These hydrothermal springs are the sites of actively forming massive sulfide mineral deposits. Cooler springs are clear to milky and support exotic benthic communities

F. N. Spiess; Ken C. MacDonald; T. Atwater; R. Ballard; A. Carranza; D. Cordoba; C. Cox; V. M. Diaz Garcia; J. Francheteau; J. Guerrero; J. Hawkins; R. Haymon; R. Hessler; T. Juteau; M. Kastner; R. Larson; B. Luyendyk; J. D. MacDougall; S. Miller; W. Normark; J. Orcutt; C. Rangin

1980-01-01

417

1. Aerial view, looking east towards Rose Island and mouth ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. Aerial view, looking east towards Rose Island and mouth of Narraganset Bay. Fort Adams is in background. The "dumplings" are to the right. Fort Wolcott was to the left. These four sites worked together to guard the entrance to Narraganset Bay and Newport Harbor. - Fort Hamilton, Rose Island, Newport, Newport County, RI

418

East Asian astronomical records  

NASA Astrophysics Data System (ADS)

Chinese, Japanese and Korean celestial observations have made major contributions to Applied Historical Astronomy, especially in the study of supernovae, comets, Earth's rotation (using eclipses) and solar variability (via sunspots and aurorae). Few original texts now survive; almost all extant records exist only in printed versions, often with the loss of much detail. The earliest Chinese astronomical observations extend back to before 1000 BC. However, fairly systematic records are only available since 200 BC - and even these have suffered losses through wars, etc. By around AD 800, many independent observations are available from Japan and Korea and these provide a valuable supplement to the Chinese data. Throughout East Asia dates were expressed in terms of a luni-solar calendar and conversion to the Julian or Gregorian calendar can be readily effected.

Stephenson, F. Richard

419

Why (not) go east? Comparison of findings from FDA Investigational New Drug study site inspections performed in Central and Eastern Europe with results from the USA, Western Europe, and other parts of the world  

PubMed Central

Since the mid-1990s, investigational sites in the countries of Central and Eastern Europe (CEE) have been increasingly utilized by pharmaceutical companies because of their high productivity in terms of patient enrolment into clinical trials. Based on the FDA’s publicly accessible Clinical Investigator Inspection List, we present an analysis of findings and outcome classifications from FDA inspections during Investigational New Drug (IND) studies and compare the results for the CEE region to those from Western European countries and the USA. Data from all 5531 FDA clinical trials inspections that occurred between 1994 (when the FDA first performed inspections in CEE) and the end of 2010 were entered into the database for comparative analysis. Of these, 4865 routine data audit (DA) inspections were analyzed: 401 from clinical trials performed in Western Europe, 230 in CEE, 3858 in the USA, and 376 in other countries. The average number of deficiencies per inspection ranged between 0.99 for CEE and 1.97 in Western Europe. No deficiencies were noted during 16.6%, 39.0%, and 21.5% of the inspections in Western Europe, CEE and USA, respectively. The percentages of inspections after which no follow-up action was indicated were 36.9% for Western Europe, 55.7% for CEE, and 44.3% for US sites. CEE was also the region with the lowest percentage of inspections that required official or voluntary action. On the basis of FDA inspection data, the high productivity of CEE sites appears to be accompanied by regulatory compliance as well as by data quality standards that are not inferior to those in Western regions. PMID:22563236

Caldron, Paul H; Gavrilova, Svetlana I; Kropf, Siegfried

2012-01-01

420

Simple estimation of minimum unsaturated contaminant travel times at Rainier Mesa and Shoshone Mountain, Nevada Test Site  

Microsoft Academic Search

In the unsaturated zone the fastest travel times frequently occur via preferential flow that bypasses the soil\\/rock matrix. Experimental data provide compelling evidence that minimum solute travel times through preferential paths depend primarily on whether water supply is continuous versus non-continuous in time, with little influence from matrix hydraulic properties. We employ a simple model based on this \\

B. A. Ebel; J. R. Nimmo

2008-01-01

421

15. VIEW LOOKING EAST AT UNDERGROUND VAULT, BUILDING 997, UNDER ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

15. VIEW LOOKING EAST AT UNDERGROUND VAULT, BUILDING 997, UNDER CONSTRUCTION. THE VAULTS WERE USED TO STORE TRIGGERS AWAITING OFF-SITE SHIPMENT, OR RETURNED TRIGGERS AWAITING TO BE TRANSPORTED TO A BUILDING FOR RECOVERY OF THE PLUTONIUM. THE VAULT WALLS WERE CONSTRUCTED 14.5 FEET THICK. BUILDING 991, IN THE BACKGROUND, WAS THE FIRST OPERATIONAL BUILDING ON SITE (2/1/52). - Rocky Flats Plant, Bounded by Indiana Street & Routes 93, 128 & 72, Golden, Jefferson County, CO

422

View to the east of the Antenna Array OvertheHorizon ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

View to the east of the Antenna Array - Over-the-Horizon Backscatter Radar Network, Christmas Valley Radar Site Transmit Sector Six Antenna Array, On unnamed road west of Lost Forest Road, Christmas Valley, Lake County, OR

423

3. View of Japanese village, type C structure, facing eastsoutheast ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. View of Japanese village, type C structure, facing east-southeast - Nevada Test Site, Japanese Village, Type C Structure, Area 4, Yucca Flat, 4-04 Road near Rainier Mesa Road, Mercury, Nye County, NV

424

3. View of collapsed structure (type A) next to type ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. View of collapsed structure (type A) next to type B structure, facing east-northeast - Nevada Test Site, Japanese Village, Area 4, Yucca Flat, 4-04 Road near Rainier Mesa Road, Mercury, Nye County, NV

425

INTERIM GEOLOGICAL INVESTIGATIONS IN THE U12b.09 AND U12b.07 TUNNELS, NEVADA TEST SITE, NYE COUNTY, NEVADA  

Microsoft Academic Search

The U12b.09 and U12b.07 tuunels are a part of the U12b tunnel system ; which was driven northwestward beneath Rainier Mesa in the northern part of the ; Nevada Test Site. The rocks penetrated by the tunnel complex are bedded tuff, ; welded tuff, and tuffaceous sandstone of the Indian Trail and Piapi Canyon ; Formation of Eocene to Pliocene

D. D. Dickey; W. L. Emerick; C. M. Bunker

1962-01-01

426

THERMOLUMINESCENCE OF SOME DOLOMITE, TUFF, AND GRANITIC ROCK SAMPLES FROM THE NORTH-CENTRAL PART OF THE NEVADA TEST SITE, NYE COUNTY, NAVADA--A PROGRESS REPORT  

Microsoft Academic Search

Thermoluminescence was determined for tuff from Rainier Mesa, dolomite ; and a quartz vein from Dolomite Hill, and granitic rock from the climax stock in ; the northern part of the nevada Test Site, Nye County, Nev. The study was made ; to determine which rocks are thermoluminescent, to explore the possibility of ; using thermoluminescence as an aid in

Dickey

1960-01-01

427

Validation of the abbreviated Radon Progeny Integrating Sampling Unit (RPISU) method for Mesa County, Colorado  

SciTech Connect

The US Department of Energy (DOE) Office of Remedial Action and Waste Technology established the Technical Measurements Center at the DOE Grand Junction, Colorado, Projects Office to standardize, calibrate, and compare measurements made in support of DOE remedial action programs. Indoor radon-daughter concentration measurements are made to determine whether a structure is in need of remedial action. The Technical Measurements Center conducted this study to validate an abbreviated Radon Progeny Integrated Sampling Unit (RPISU) method of making indoor radon-daughter measurements to determine whether a structure has a radon-daughter concentration (RDC) below the levels specified in various program standards. The Technical Measurements Center established a criterion against which RDC measurements made using the RPISU sampling method are evaluated to determine if sampling can be terminated or whether further measurements are required. This abbreviated RPISU criterion was tested against 317 actual sets of RPISU data from measurements made over an eight-year period in Mesa County, Colorado. The data from each location were tested against a standard that was assumed to be the same as the actual annual average RDC from that location. At only two locations was the criterion found to fail. Using the abbreviated RPISU method, only 0.6% of locations sampled can be expected to be falsely indicated as having annual average RDC levels below a given standard.

Langner, G.H. Jr.

1987-06-01

428

Characterization of GaAs mesa photodiodes with X-ray and ?-ray photons  

NASA Astrophysics Data System (ADS)

Results characterizing the performance of prototype thin (3 ?m i layer) GaAs p+-i-n+ mesa photodiodes (one 200 ?m diameter and one 400 ?m diameter device) are presented showing the spectral performance of the devices at photon energies from 4.95 keV (V K?1 X-ray fluorescence) to 59.5 keV (241Am ?-ray emission). The devices were operated uncooled at +33.3 °C. The energy resolution (full width half maximum) was measured to vary from 780 eV at 4.95 keV to 950 eV at 59.5 keV for the 200 ?m diameter diode, and from 1.08 keV at 4.95 keV to 1.33 keV at 59.5 keV for the 400 ?m diameter diode. The increased broadening of FWHM with increasing photon energy was found to be greater than can be explained by the expected energy dependence of the Fano noise, but the peak charge output from the devices varied linearly (R2200 ?m=0.99998, R2400 ?m=0.999998) with incident photon energy.

Barnett, A. M.

2014-08-01

429

Geology of drill hole UE18t and Area 18, Timber Mountain Caldera Moat, Nevada Test Site  

Microsoft Academic Search

Drill hole UE18t, located in the northeastern part of the Timber Mountain Caldera Moat (Area ft Nye County, Nevada, was sited to obtain chemical and physical data of the caldera-fill deposits and to extend knowledge of the geologic and hydrologic environment of the Nevada Test Site. Caldera-fill deposits in the area of subsidence related to eruption of the Rainier Mesa

F. M. Jr. Byers; W. L. Hawkins; D. C. Muller

1981-01-01

430

Flood control in East Pakistan  

E-print Network

of the river. Ths Oovernmsnt of East Bengal (East pakistan) has recently secured a good number of dredgers of both bucket and suction type which could be profitably utilised in the operation of this project, Since sufficient hydrologic snd other data ars...&19RARv 6 A N CutiE&& OF ~ PLOOD CONTROL EAST PAKISTAN A Thesis By H. R. S, R. K, EUSVPZAI Submitted to the Craduate School of the Agricultural and Mechanical College of Texas in partial fulfillment of the requirements for the degree...

Eusufzai, Mohammad Hossain Sekandar Hayat Khan

1956-01-01

431

Toward the East Asian Observatory  

NASA Astrophysics Data System (ADS)

I report here about the future direction of cooperation of astronomy in East Asia region, which has been a long-years subject of the EAMA since 1990. During this EAMA-6 we had many positive discussions and remarkable progress toward the promotion of our cooperation. We also had an ``East Asian Observatory'' WG meeting yesterday with many attendants, and actively discussed this important subject in some detail. The following report is to summarize the fruitful products we had in the EAMA-6 discussions and in past EAMA activities, and to propose a direction and some action items toward the bright future of astronomy in East Asia.

Kaifu, Norio

2005-06-01

432

Sumo: East and West  

NSDL National Science Digital Library

Often misrepresented outside of its home country, the physically intense sport of sumo is revered by the Japanese and is also a part of the Shinto religion. The sport and its changing traditions come under the documentary lens of filmmakers Ferne Pearlstein and Robert Edwards as they spent four years examining the sport for the Independent Lens series on PBS. Visitors to the site can learn about the different wrestlers profiled in the film, the transformation of the sport as bigger, heavier American sumo wrestlers from Hawaii have entered the field, and the promotion of sumo wrestling in the United States. One particularly nice feature of the site is an area entitled Sumo Style which allows users to learn more about the sumo wrestler, his garb, and his movements. The site is rounded out by a trailer for the film and a good selection of related websites, such as the American Sumo Association.

433

Interim long-term surveillance plan for the Cheney disposal site near, Grand Junction, Colorado  

SciTech Connect

This interim long-term surveillance plan (LTSP) describes the U.S. Department of Energy`s (DOE) long-term care program for the Uranium Mill Tailings Remedial Action (UMTRA) Project Cheney Disposal Site in Mesa County near Grand Junction, Colorado. This LSTP describes the long-term surveillance program the DOE will implement to ensure the Cheney disposal site performs as designed and is cared for in a manner that protects the public health and safety and the environment. Before each disposal site is licensed for custody and long-term care, the Nuclear Regulatory Commission (NRC) requires the DOE to submit such a site-specific LTSP.

NONE

1997-08-01

434

East Tennessee State University Web Privacy Statement  

E-print Network

East Tennessee State University Web Privacy Statement A Note to Children and Parents East Tennessee. Parents: East Tennessee State University recommends that parents take an active role in their children of their personal information while using the Internet. Commitment to Privacy East Tennessee State University values

Karsai, Istvan

435

MESA and NuGrid Simulations of Classical Nova Outbursts and Nucleosynthesis  

NASA Astrophysics Data System (ADS)

Classical novae are the results of surface thermonuclear explosions of hydrogen accreted by white dwarfs (WDs) from their low-mass main-sequence or red-giant binary companions. Chemical composition analysis of their ejecta shows that nova outbursts occur on both carbon-oxygen (CO) and more massive oxygen-neon (ONe) WDs, and that there is cross-boundary mixing between the accreted envelope and underlying WD. We demonstrate that the state-of-the-art stellar evolution code MESA and post-processing nucleosynthesis tools of NuGrid can successfully be used for modeling of CO and ONe nova outbursts and nucleosynthesis. The convective boundary mixing (CBM) in our 1D numerical simulations is implemented using a diffusion coefficient that is exponentially decreasing with a distance below the bottom of the convective envelope. We show that this prescription produces maximum temperature evolution profiles and nucleosynthesis yields in good agreement with those obtained using the commonly adopted 1D nova model in which the CBM is mimicked by assuming that the accreted envelope has been pre-mixed with WD's material. In a previous paper, we have found that 3He can be produced in situ in solar-composition envelopes accreted with slow rates (? < 10-10 M?/yr) by cold (TWD<107 K) CO WDs, and that convection is triggered by 3He burning before the nova outburst in this case. Here, we confirm this result for ONe novae. Additionally, we find that the interplay between the 3He production and destruction in the solar-composition envelope accreted with an intermediate rate, e.g. ? = 10-10 M?/yr, by the 1.15 M? ONe WD with a relatively high initial central temperature, e.g. TWD =15×106 K, leads to the formation of a thick radiative buffer zone that separates the bottom of the convective envelope from the WD surface.

Denissenkov, P.; Herwig, F.; Pignatari, M.; Truran, J. W.

2014-12-01

436

Automatic analysis of cardiac repolarization morphology using Gaussian mesa function modeling.  

PubMed

A novel fully automated method for wave identification and extraction from electrocardiogram (ECG) waveforms is presented. This approach implements the combined use of a new machine-learning algorithm and of specified parameterized functions called Gaussian mesa functions (GMFs). Individual cardiac cycle waveforms are broken up into GMFs using a generalized orthogonal forward regression algorithm; each individual GMF is subsequently identified (wave labeling) and analyzed for feature and morphologic extraction. The GMF associated with the repolarization waveform of the main vector lead, based on principal components analysis, was analyzed, and a set of morphologic parameters were derived under 2 experimental settings: first, in 100 digital 12-lead ECG Holter recordings acquired during three 24-hour periods (baseline and after 160 and 320 mg of sotalol) from 38 healthy subjects; second, in drug-free 12-lead resting ECGs from 100 genotyped long QT syndrome (LQTS) patients (50 each with LQT1 and LQT2). QT-interval duration was measured using an on-screen method applied to the global representative beats and reviewed by a senior cardiologist. QTci (individual correction) was used for analysis. All parameters in the sotalol test showed highly significant differences between the time of peak plasma concentration (Tmax) and baseline ECGs; however, the dynamic pattern of individual parameters followed different patterns. The LQTS test confirmed the results of the sotalol test, showing that GMF-based repolarization parameters were strongly modified as compared with healthy controls. In particular, T-wave width and descending phase of repolarization were more prolonged in LQT2 compared to LQT1. PMID:18954609

Badilini, Fabio; Vaglio, Martino; Dubois, Rémi; Roussel, Pierre; Sarapa, Nenad; Denjoy, Isabelle; Extramiana, Fabrice; Maison-Blanche, Pierre

2008-01-01

437

Development of Site-Specific Irrigation Research under Linear Move Systems  

Microsoft Academic Search

An off-the-shelf PLC-based control system has been developed and field tested to enable site- specific irrigation of multiple 50 ft X 80 ft research plots using either mid-elevation spray heads (MESA) and low energy precision application (LEPA) irrigation methods on linear move sprinkler systems. Both methods were installed on one machine to cover the same areas whereas the second system

Montana Sidney; Robert G Evans; W. Bart Stevens; William M. Iversen

438

INTERIM GEOLOGICAL INVESTIGATIONS IN THE U12e.04 TUNNEL, NEVADA TEST SITE, NYE COUNTY, NEVADA  

Microsoft Academic Search

ABS>The U12e.04 tunnel is a part of the U12e tunnel system, which has ; been driven southwestward beneath Rainier Mesa in the northern part of the Nevada ; Test Site. The U12e.04 tunnel was driven about S. 15 deg W. in zeolitic tuff of ; subunits E and F of Tunnel Bed 4 near the top of the lower member

W. L. Emerick; D. D. Dickey; F. A. McKeown

1962-01-01

439

Occupational Risk Factors for COPD Phenotypes in the Multi-Ethnic Study of Atherosclerosis (MESA) Lung Study  

PubMed Central

Introduction The contribution of occupational exposure to the risk of chronic obstructive pulmonary disease COPD in population-based studies is of interest. We compared the performance of self-reported exposure to a newly developed JEM in exposure-response evaluation. Methods We used cross-sectional data from Multi-Ethnic Study of Atherosclerosis (MESA), a population-based sample of 45–84 year olds free of clinical cardiovascular disease at baseline. MESA ascertained the most recent job and employment, and the MESA Lung Study measured spirometry, and occupational exposures for 3686 participants. Associations between health outcomes (spirometry defined airflow limitation and Medical Research Council-defined chronic bronchitis) and occupational exposure [self-reported occupational exposure to vapor-gas, dust, or fumes (VGDF), severity of exposure, and a job-exposure matrix (JEM)-derived score] were evaluated using logistic regression models adjusted for non-occupational risk factors. Results The prevalence of airflow limitation was associated with self-reported exposure to vapor-gas (OR 2.6, 95%CI 1.1–2.3), severity of VGDF exposure (P-trend<0.01), and JEM dust exposure (OR 2.4, 95%CI 1.1–5.0), and with organic dust exposure in females; these associations were generally of greater magnitude among never smokers. The prevalence of chronic bronchitis and wheeze was associated with exposure to VGDF. The association between airflow limitation and the combined effect of smoking and VGDF exposure showed an increasing trend. Self-reported vapor-gas, dust, fumes, years and severity of exposure were associated with increased prevalence of chronic bronchitis and wheeze (P<0.001). Conclusions Airflow limitation was associated with self-reported VGDF exposure, its severity, and JEM-ascertained dust exposure in smokers and never-smokers in this multiethnic study. PMID:24568208

Doney, Brent; Hnizdo, Eva; Graziani, Monica; Kullman, Greg; Burchfiel, Cecil; Baron, Sherry; Fujishiro, Kaori; Enright, Paul; Hankinson, John L.; Stukovsky, Karen Hinckley; Martin, Christopher J.; Donohue, Kathleen M.; Barr, R. Graham

2014-01-01

440

1. GENERAL VIEW OF OBSERVATION BUNKERS TO THE EAST OF ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. GENERAL VIEW OF OBSERVATION BUNKERS TO THE EAST OF TEST STAND 1-A: IN FOREGROUND, BUILDING 8769, A TWO WINDOW DESIGN (NOT ON SITE PLAN); IN THE MIDDLE DISTANCE, BUILDING 8768, A ONE WINDOW DESIGN "OBSERVATION AND CAMERA BUILDING NO. 2" ON SITE PLAN; IN THE DISTANCE, AT FAR LEFT, BUILDING 8767, A FOUR WINDOW DESIGN "MASTER OBSERVATION AND CAMERA BUILDING NO. 1" ON SITE PLAN. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Observation Bunkers for Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

441

Determination of the optimum massive hydraulic fracturing design for the stimulation of the Wasatch and Mesa Verde formations. Annual report  

SciTech Connect

The MHF project in the Natural Buttes Unit, Bitter Creek Field, Utah has progressed through five of the eight phases of the scheduled program. The last three phases of the program are in progress. Two of the three remaining phases should be finished by 10-1-78, with the testing of CIGE 21-15-10-22 to continue until approximately 1-1-79. Results from this project indicate that MHF stimulations of low permeability sands such as the Mesa Verde--Wasatch are economically high risk. The technology necessary to perform an MHF is adequate; however, the results anticipated must be carefully evaluated with respect to economics.

Merrill, R.G.

1978-07-01

442

Strontium Isotopic Composition of Paleozoic Carbonate Rocks in the Nevada Test Site Vicinity, Clark, Lincoln, and Nye Counties, Nevada, and Inyo County, California  

USGS Publications Warehouse

Ground water moving through permeable Paleozoic carbonate rocks represents the most likely pathway for migration of radioactive contaminants from nuclear weapons testing at the Nevada Test Site, Nye County, Nevada. The strontium isotopic composition (87Sr/86Sr) of ground water offers a useful means of testing hydrochemical models of regional flow involving advection and reaction. However, reaction models require knowledge of 87Sr/86Sr data for carbonate rock in the Nevada Test Site vicinity, which is scarce. To fill this data gap, samples of core or cuttings were selected from 22 boreholes at depth intervals from which water samples had been obtained previously around the Nevada Test Site at Yucca Flat, Frenchman Flat, Rainier Mesa, and Mercury Valley. Dilute acid leachates of these samples were analyzed for a suite of major- and trace-element concentrations (MgO, CaO, SiO2, Al2O3, MnO, Rb, Sr, Th, and U) as well as for 87Sr/86Sr. Also presented are unpublished analyses of 114 Paleozoic carbonate samples from outcrops, road cuts, or underground sites in the Funeral Mountains, Bare Mountain, Striped Hills, Specter Range, Spring Mountains, and ranges east of the Nevada Test Site measured in the early 1990's. These data originally were collected to evaluate the potential for economic mineral deposition at the potential high-level radioactive waste repository site at Yucca Mountain and adjacent areas (Peterman and others, 1994). Samples were analyzed for a suite of trace elements (Rb, Sr, Zr, Ba, La, and Ce) in bulk-rock powders, and 87Sr/86Sr in partial digestions of carbonate rock using dilute acid or total digestions of silicate-rich rocks. Pre-Tertiary core samples from two boreholes in the central or western part of the Nevada Test Site also were analyzed. Data are presented in tables and summarized in graphs; however, no attempt is made to interpret results with respect to ground-water flow paths in this report. Present-day 87Sr/86Sr values are compared to values for Paleozoic seawater present at the time of deposition. Many of the samples have 87Sr/86Sr compositions that remain relatively unmodified from expected seawater values. However, rocks underlying the northern Nevada Test Site as well as rocks exposed at Bare Mountain commonly have elevated 87Sr/86Sr values derived from post-depositional addition of radiogenic Sr most likely from fluids circulating through rubidium-rich Paleozoic strata or Precambrian basement rocks.

Paces, James B.; Peterman, Zell E.; Futo, Kiyoto; Oliver, Thomas A.; Marshall, Brian D.

2007-01-01

443

Department of Arts Outreach Claire Trevor School of the Arts, UC Irvine 213 Mesa Arts Building, Irvine, CA 92697 (949) 824-8976 artsoutreach@uci.edu 14-15 CC Intern Application Rev. 6/17/14  

E-print Network

Department of Arts Outreach Claire Trevor School of the Arts, UC Irvine 213 Mesa Arts Building and graduate students majoring in the arts at UC Irvine's Claire Trevor School of the Arts. Interns) #12;Department of Arts Outreach Claire Trevor School of the Arts, UC Irvine 213 Mesa Arts Building

Mease, Kenneth D.

444

Holocene paleomagnetic secular variation from East China Sea and a PSV stack of East Asia  

NASA Astrophysics Data System (ADS)

Paleomagnetic secular variation (PSV) provides information on the mechanisms of the geodynamo and can also be used for stratigraphic correlation on a regional scale. In this study, we constructed PSV curves of relative rapidly deposited Holocene marine sequence from East China Sea. Results show that the dominant magnetic carriers are pseudo-single domain (PSD) to multidomain (MD) magnetites. Paleomagnetic directions are preserved by coarse-grained magnetite, even affected by post-depositional diagenetic alteration. The PSV record of core MD06-3040 exhibits six major inclination peaks and five declination swings during the Holocene. The periodicities for inclination are about 2000 and 550 years, and for declination are about 1400 and 500 years. The PSV of MD06-3040 is comparable to archeomagnetic and historic results for the last 2500 years and to PSV results from lake sediments in southern China and Japan during the Holocene. A PSV stack of East Asia is constructed by sedimentary and archeological PSV results, which can be used as an important reference curve for a large region, and the PSV correlation between sites can be applied for relative dating of East Asia.

Zheng, Yan; Zheng, Hongbo; Deng, Chenglong; Liu, Qingsong

2014-11-01

445

Site and Operations Overview 1-1 1. Site and Operations Overview  

E-print Network

Site and Operations Overview 1-1 1. Site and Operations Overview Setting The Oak Ridge Reservation Ridge Y-12 Plant, Oak Ridge National Laboratory, and East Tennessee Technology Park (formerly the K-25 Ridge Reservation Annual Site Environmental Report and Environmental Monitoring on the Oak Ridge

Pennycook, Steve

446

Texas Historic Sites Atlas  

NSDL National Science Digital Library

Most everything is a bit bigger down around the Rio Grande, and the Texas Historic Sites Atlas fits neatly into that bit of folk wisdom about things in the Lone Star state. All told, the Atlas contains close to 300,000 historic and archaeological site records documenting Texas history. As all of this information is linked up to mapping software, visitors can find a historic site's location and its current condition. To give users a sense of what they can locate here, the database includes records for Texas Historical Markers, county courthouses, cemeteries, and even the fabled East Texas sawmills. For persons with a penchant for historic preservation, cultural geography, or just the state of Texas, this site is a real treat.

447

Assessment of potential migration of radionuclides and trace elements from the White Mesa uranium mill to the Ute Mountain Ute Reservation and surrounding areas, southeastern Utah  

USGS Publications Warehouse

In 2007, the Ute Mountain Ute Tribe requested that the U.S. Environmental Protection Agency and U.S. Geological Survey conduct an independent evaluation of potential offsite migration of radionuclides and selected trace elements associated with the ore storage and milling process at an active uranium mill site near White Mesa, Utah. Specific objectives of this study were (1) to determine recharge sources and residence times of groundwater surrounding the mill site, (2) to determine the current concentrations of uranium and associated trace elements in groundwater surrounding the mill site, (3) to differentiate natural and anthropogenic contaminant sources to groundwater resources surrounding the mill site, (4) to assess the solubility and potential for offsite transport of uranium-bearing minerals in groundwater surrounding the mill site, and (5) to use stream sediment and plant material samples from areas surrounding the mill site to identify potential areas of offsite contamination and likely contaminant sources. The results of age-dating methods and an evaluation of groundwater recharge temperatures using dissolved-gas samples indicate that groundwater sampled in wells in the surficial aquifer in the vicinity of the mill is recharged locally by precipitation. Tritium/helium age dating methods found a "modern day" apparent age in water samples collected from springs in the study area surrounding the mill. This apparent age indicates localized recharge sources that potentially include artificial recharge of seepage from constructed wildlife refuge ponds near the mill. The stable oxygen isotope-ratio, delta oxygen-18, or ?(18O/16O), known as ?18O, and hydrogen isotope-ratio, delta deuterium, or ?(2H/1H), known as ?D, data indicate that water discharging from Entrance Spring is isotopically enriched by evaporation and has a similar isotopic fingerprint as water from Recapture Reservoir, which is used as facilities water on the mill site. Water from Recapture Reservoir also is used to irrigate fields surrounding the town of Blanding and infiltration of this irrigated water also could contribute to the enriched isotopic fingerprint observed for Entrance Spring. Similarities in the delta sulfur-34sulfate values in water samples from the wildlife ponds and tailings cells indicate a potential contaminant linkage between the tailings cells and the refuge ponds that could be related to wind carried (eolian) transport of aerosols from the tailings cells. To date (2010), neither the delta sulfur-34sulfate nor the delta oxygen-18sulfate values measured in the wells and springs surrounding the uranium mill site have an isotopic signature characteristic of water from the tailings cells. Except for Entrance Spring and Mill Spring, all groundwater samples collected at down-gradient sample sites during this study had dissolved-uranium concentrations in the range expected for naturally-occurring uranium. The uranium-isotope data indicate that the mill is not a source of uranium in the groundwater in the unconfined-aquifer at any site monitored during the study, with the possible exception of Entrance Spring. The uranium-234 to uranium-238 concentration activity ratios measured in water samples collected at Entrance Spring, and the decrease in this ratio associated with an increase in the concentration of dissolved uranium indicate potential mixing of uranium ore with groundwater at the spring through eolian transport of small particles from ore-storage pads and uncovered ore trucks, with subsequent deposition in the Entrance Spring drainage, followed by dissolution in the unconfined groundwater. The isotopic values of uranium found in other water samples collected during the study do not appear to be related to uranium ore deposits. Water samples collected from Entrance Spring contained the highest median uranium concentrations relative to water samples collected from the other wells and springs monitored during the study. Water samples collected from Entrance Spring also contained elevated concentrations of selen

Naftz, David L.; Ranalli, Anthony J.; Rowland, Ryan C.; Marston, Thomas M.

2011-01-01

448

Deep Resistivity Structure of Mid Valley, Nevada Test Site, Nevada  

USGS Publications Warehouse

The U.S. Department of Energy (DOE) and the National Nuclear Security Administration (NNSA) at their Nevada Site Office (NSO) are addressing ground-water contamination resulting from historical underground nuclear testing through the Environmental Management (EM) program and, in particular, the Underground Test Area (UGTA) project. From 1951 to 1992, 828 underground nuclear tests were conducted at the Nevada Test Site northwest of Las Vegas (DOE UGTA, 2003). Most of these tests were conducted hundreds of feet above the ground-water table; however, more than 200 of the tests were near, or within, the water table. This underground testing was limited to specific areas of the Nevada Test Site including Pahute Mesa, Rainier Mesa/Shoshone Mountain (RM-SM), Frenchman Flat, and Yucca Flat. One issue of concern is the nature of the somewhat poorly constrained pre-Tertiary geology and its effects on ground-water flow in the area subsequent to a nuclear test. Ground-water modelers would like to know more about the hydrostratigraphy and geologic structure to support a hydrostratigraphic framework model that is under development for the Rainier Mesa/Shoshone Mountain (RM-SM) Corrective Action Unit (CAU) (National Security Technologies, 2007). During 2003, the U.S. Geological Survey (USGS), in cooperation with the DOE and NNSA-NSO collected and processed data at the Nevada Test Site in and near Yucca Flat (YF) to help define the character, thickness, and lateral extent of the pre-Tertiary confining units. We collected 51 magnetotelluric (MT) and audio-magnetotelluric (AMT) stations for that research (Williams and others, 2005a, 2005b, 2005c, 2005d, 2005e, and 2005f). In early 2005 we extended that research with 26 additional MT data stations (Williams and others, 2006) located on and near Rainier Mesa and Shoshone Mountain (RM-SM). The new stations extended the area of the hydrogeologic study previously conducted in Yucca Flat, further refining what is known about the pre-Tertiary confining units. In particular, a major goal was to define the extent of the upper clastic confining unit (UCCU). The UCCU is composed of late Devonian to Mississippian siliciclastic rocks assigned to the Eleana Formation and Chainman Shale (National Security Technologies, 2007). The UCCU underlies the Yucca Flat area and extends southwestward toward Shoshone Mountain, westward toward Buckboard Mesa, and northwestward toward Rainier Mesa. Late in 2005 we collected data at an additional 14 MT stations in Mid Valley, CP Hills, and northern Yucca Flat. That work was done to better determine the extent and thickness of the UCCU near the boundary between the southeastern RM-SM CAU and the southwestern YF CAU, and also in the northern YF CAU. The MT data have been released in a separate U.S. Geological Survey report (Williams and others, 2007). The Nevada Test Site magnetotelluric data interpretation presented in this report includes the results of detailed two-dimensional (2-D) resistivity modeling for each profile and inferences on the three-dimensional (3-D) character of the geology within the region.

Wallin, Erin L.; Rodriguez, Brian D.; Williams, Jackie M.

2009-01-01

449

Petrology and Geochemistry of the Trachyte Mesa Magma Sheets, Henry Mountains, Utah.  

NASA Astrophysics Data System (ADS)

Trachyte Mesa (TM) is a satellite laccolithic intrusion peripheral to the Mount Hillers intrusive center in the Henry Mountains of south-central Utah. The TM outcrops are characteristically composed of plagioclase- hornblende porphyry which contain rare mafic crustal xenoliths. On the basis of geophysical evidence, Morgan and others (GSA Annual Meeting Field Guide, 2005) have suggested that the Mount Hillers center fed TM via several "magma fingers" as opposed to dikes. Moreover, on the basis of outcrop relationships, they proposed that the TM developed its laccolithic shape through inflation related to successive emplacement of several magma "sheets." Given the well-exposed nature of the TM sheets, numerous samples were collected and analyzed to evaluate geochemical characteristics and potential compositional variations within and among the sheets. Our preliminary results indicate that the analyzed sheets are compositionally classified as dacite, and fall within the range of values published by other authors for laccolithic rocks of the Henry Mountains (e.g. Nelson and Davidson, 1997). The TM samples are characterized by the following compositional ranges: SiO2=62.5-65.5%; TiO2=.44-.53%; Al2O3 =17.5-19%; Fe2O3=3.4-4.7%; MnO=.05-.15%; MgO=0.4-1.5%; CaO=4.8-7%; Na2O=3.5-4.3%; K2O=2-2.6%; P2O5=.19-.23%; Nb=4-9ppm; Zr=120-160ppm; Y=14-18ppm; Sr=650-950ppm; Rb=25-40ppm; Pb=12-25ppm; V=53-77ppm; and Ba=950-1100ppm. Within individual sheets, the observed compositional variation of major and trace elements is relatively small, with no obvious evidence of systematic geochemical change. Similarly, among various sheets, the compositional variation of most major and trace elements also appears to be small, however, our existing data do not preclude the possibility of real but subtle geochemical variations between individual sheets. At present, however, our data and observations suggest that the TM laccolith was formed from a rather homogeneous magma characterized by a lack of significant geochemical differentiation. Consequently, it may be inferred that the emplacement of the TM was a relatively rapid as opposed to a prolonged and/or episodic event.

Matty, D. J.; Student, J. J.; Morgan, S. S.

2006-12-01

450

Stability and predictors of change in salivary cortisol measures over six years: MESA.  

PubMed

A major challenge in characterizing features of the daily cortisol curve is variability in features over time. Few studies have examined the stability of daily features of the cortisol curve over long periods or the predictors of long term changes. Repeated salivary cortisol measures on 580 adults from the MESA Stress study were used to examine the stability of various features of the daily cortisol curve (wakeup value, the cortisol awakening response (CAR), the early and late decline slope and the area under the curve (AUC)), over short periods (several days) and long periods (approximately 6-years) and to investigate the association of demographic factors with the changes. Intraclass correlation coefficients (ICCs) were used to estimate the short and long term stability. Piecewise linear mixed models were used to assess factors associated with changes in features over time. For most features, short term stability (ICCs: 0.17-0.74) was higher than long term stability (ICCs: 0.05-0.42), and long term stability was highest when several days were averaged for each time point. The decline over the day showed the highest long term stability: when several days for each wave were averaged the stability of the daily decline slope across 6 years was similar (or higher) than the stability across short periods. AUC had high stability over short periods (ICCs: 0.65-0.74) but much lower stability across long periods (ICC: 0.05). All features of daily cortisol curve investigated changed significantly over the approximately 6 year follow-up period. The wakeup cortisol became higher; the CAR became smaller; both the early and late decline became flatter; and the AUC became larger. Hispanics experienced significantly larger increases in the wakeup value; and African-Americans and Hispanics showed less flattening over time of the early decline slope than Non-Hispanic Whites. Our findings have implications for characterization of features in studies linking cortisol to health outcomes. The presence of variability over time suggests opportunities for future investigation of the predictors of changes over time as well as the links between these changes and health outcomes. PMID:25137485

Wang, Xu; Sánchez, Brisa N; Golden, Sherita Hill; Shrager, Sandi; Kirschbaum, Clemens; Karlamangla, Arun S; Seeman, Teresa E; Roux, Ana V Diez

2014-11-01

451

Application of Geographic Information System Methods to Identify Areas Yielding Water that will be Replaced by Water from the Colorado River in the Vidal and Chemehuevi Areas, California, and the Mohave Mesa Area, Arizona  

USGS Publications Warehouse

Relations between the elevation of the static water level in wells and the elevation of the accounting surface within the Colorado River aquifer in the vicinity of Vidal, California, the Chemehuevi Indian Reservation, California, and on Mohave Mesa, Arizona, were used to determine which wells outside the flood plain of the Colorado River are presumed to yield water that will be replaced by water from the Colorado River. Wells that have a static water-level elevation equal to or below the elevation of the accounting surface are presumed to yield water that will be replaced by water from the Colorado River. Geographic Information System (GIS) interpolation tools were used to produce maps of areas where water levels are above, below, and near (within ? 0.84 foot) the accounting surface. Calculated water-level elevations and interpolated accounting-surface elevations were determined for 33 wells in the vicinity of Vidal, 16 wells in the Chemehuevi area, and 35 wells on Mohave Mesa. Water-level measurements generally were taken in the last 10 years with steel and electrical tapes accurate to within hundredths of a foot. A Differential Global Positioning System (DGPS) was used to determine land-surface elevations to within an operational accuracy of ? 0.43 foot, resulting in calculated water-level elevations having a 95-percent confidence interval of ? 0.84 foot. In the Vidal area, differences in elevation between the accounting surface and measured water levels range from -2.7 feet below to as much as 17.6 feet above the accounting surface. Relative differences between the elevation of the water level and the elevation of the accounting surface decrease from west to east and from north to south. In the Chemehuevi area, differences in elevation range from -3.7 feet below to as much as 8.7 feet above the accounting surface, which is established at 449.6 feet in the vicinity of Lake Havasu. In all of the Mohave Mesa area, the water-level elevation is near or below the elevation of the accounting surface. Differences in elevation between water levels and the accounting surface range from -0.2 to -11.3 feet, with most values exceeding -7.0 feet. In general, the ArcGIS Triangulated Irregular Network (TIN) Contour and Natural Neighbor tools reasonably represent areas where the elevation of water levels in wells is above, below, and near (within ? 0.84 foot) the elevation of the accounting surface in the Vidal and Chemehuevi study areas and accurately delineate areas around outlying wells and where anomalies exist. The TIN Contour tool provides a strict linear interpolation while the Natural Neighbor tool provides a smoothed interpolation. Using the default options in ArcGIS, the Inverse Distance Weighted (IDW) and Spline tools also reasonably represent areas above, below, and near the accounting surface in the Vidal and Chemehuevi areas. However, spatial extent of and boundaries between areas above, below, and near the accounting surface vary among the GIS methods, which results largely from the fundamentally different mathematical approaches used by these tools. The limited number and spatial distribution of wells in comparison to the size of the areas, and the locations and relative differences in elevation between water levels and the accounting surface of wells with anomalous water levels also influence the contouring by each of these methods. Qualitatively, the Natural Neighbor tool appears to provide the best representation of the difference between water-level and accounting-surface elevations in the study areas, on the basis of available well data.

Spangler, Lawrence E.; Angeroth, Cory E.; Walton, Sarah J.

2008-01-01