These are representative sample records from Science.gov related to your search topic.
For comprehensive and current results, perform a real-time search at Science.gov.
1

NORTHWESTERN UNIVERSITY Pattern Formation in Two-Frequency Forced Faraday Waves  

E-print Network

Pattern Formation in Two-Frequency Forced Faraday Waves Chad Michael Topaz This dissertation investigatesNORTHWESTERN UNIVERSITY Pattern Formation in Two-Frequency Forced Faraday Waves A DISSERTATION OF PHILOSOPHY Field of Applied Mathematics By Chad Michael Topaz EVANSTON, ILLINOIS December 2002 #12;ABSTRACT

Topaz, Chad M.

2

Simplified stratigraphic cross sections of the Eocene Green River Formation in the Piceance Basin, northwestern Colorado  

USGS Publications Warehouse

Thirteen stratigraphic cross sections of the Eocene Green River Formation in the Piceance Basin of northwestern Colorado are presented in this report. Originally published in a much larger and more detailed form by Self and others (2010), they are shown here in simplified, page-size versions that are easily accessed and used for presentation purposes. Modifications to the original versions include the elimination of the detailed lithologic columns and oil-yield histograms from Fischer assay data and the addition of ground-surface lines to give the depth of the various oil shale units shown on the cross section.

Dietrich, John D.; Johnson, Ronald C.

2013-01-01

3

Undrilled Muddy formation (Lower Cretaceous) paleodrainage basin, southwestern Wyoming and northwestern Colorado  

SciTech Connect

The Muddy formation (Lower Cretaceous) of the central and northern Rocky Mountains has produced over 1.5 billion bbl of oil equivalent hydrocarbons. Traps are developed in buried hills, valley fills, and onlapping marine sands associated with subaerial unconformities formed during a sea level drop. At least 10 paleodrainage basins developed at maximum lowstand. Of these, production has been established in seven. One such paleodrainage, herein designated the Washakie/Sand Wash basin (WSW) drainage, is only drilled peripherally and remains essentially untested over nearly 20,000 km/sup 2/. The WSW paleodrainage is productive in Wyoming from local tributary sandstones at Sugar Creek field (Sierra Madre uplift) and Lost Soldier field (Sweetwater uplift). A major through-going trunk drainage network is productive at Brady field (Rock Springs uplift) and in numerous pools on the Axial and Douglas Creek arches of northwestern Colorado. A recent deep wildcat in northwestern Colorado has confirmed subsurface existence of additional valley networks. Ten to fourteen percent porosity at 5800 m and recent deep Muddy equivalent valley fill discoveries on the southern Moxa arch (Wyoming) demonstrate reservoir potential throughout this trend. Future drilling successes will require 3400 to 6000-m deep tests but should result in significant deep gas and condensate production.

Dolson, J.; Leighton, V.

1989-03-01

4

Formation of bottom water and its variability in the northwestern part of the Sea of Japan  

NASA Astrophysics Data System (ADS)

downslope descent of dense shelf water in the northwestern part of the Sea of Japan is investigated from a dynamical point of view, paying attention to the formation of bottom water in the winter of 2001. It is supposed that before 1980, the shelf water in Peter the Great Bay sometimes descended far down the continental slope, at least partly reaching depths in excess of 3000 m (the foot of the continental slope). After 1980, however, the shelf water did not descend as far; it either descended only moderately or not at all. In Winter 2001, however, the dense shelf water again descended to depths greater than 3000 m, resulting in the formation of bottom water. Descents of more than 3000 m are due to low temperatures coupled with high salinities, whereas the moderate descents of the late 20th century were purely related to the low temperature of the shelf water. It is estimated that over the continental slope, the shelf water becomes mixed with the ambient water in a ratio of about 1:9 for deep descents, whereas the ratio is about 1:5 for moderate descents. The formation of bottom water is greatly influenced by interannual atmospheric variability; thus in Winter 2001 a combination of the strengthened Siberian High (especially in its northern part) and the Aleutian Low advected very cold air into northeast Asia, producing dense shelf water and resulting in the formation of bottom water.

Tanaka, Kiyoshi

2014-03-01

5

Sedimentology and petroleum occurrence, Schoolhouse Member, Maroon Formation (Lower Permian), northwestern Colorado  

SciTech Connect

The Lower Permian Schoolhouse Member of the Maroon Formation (formerly considered the Schoolhouse Tongue of the Weber Sandstone) forms a partly exhumed petroleum reservoir in the Eagle basin of northwestern Colorado. The Schoolhouse consists mainly of yellowish gray to gray, low-angle to parallel bedded, very fine to fine-grained sandstone of eolian sand-sheet origin; interbedded fluvial deposits are present in most sections. The sand-sheet deposits of the Schoolhouse Member are sedimentologically and petrologically similar to those in the underlying red beds of the main body of the Maroon Formation, and the Schoolhouse is considered the uppermost sand sheet in the Maroon depositional sequence. The bleached and oil-stained Schoolhouse member is distinguished from the underlying Maroon red beds on the basis of its diagenetic history, which is related to regional hydrocarbon migration and development of secondary porosity. Geological and geochemical data suggest that Schoolhouse Member oils have upper Paleozoic sources, including the intrabasinal Belden Formation. 13 figs., 1 tab.

Johnson, S.Y.; Schenk, C.J.; Anders, D.L.; Tuttle, M.L. (Geological Survey, Denver, CO (USA))

1990-02-01

6

A new herrerasaurid (Dinosauria, Saurischia) from the Upper Triassic Ischigualasto Formation of northwestern Argentina.  

PubMed

Herrerasauridae comprises a basal clade of dinosaurs best known from the Upper Triassic of Argentina and Brazil, which have yielded remains of Herrerasaurus ischigualastensis and Staurikosaurus pricei, respectively. Systematic opinion regarding the position of Herrerasauridae at the base of Dinosauria has varied. Here we describe a new herrerasaurid, Sanjuansaurus gordilloi gen. n., sp. n., based on a partial skeleton from Carnian-age strata of the the Upper Triassic Ischigualasto Formation of northwestern Argentina. The new taxon is diagnosed by numerous features, including long, band-shaped and posterolaterally oriented transverse process on the posterior cervical vertebrae; neural spines of the sixth to eighth dorsal vertebrae, at least, bearing acute anterior and posterior processes; scapula and coracoid with everted lateral margins of the glenoid; and short pubis (63% of the femoral length). Phylogenetic analysis placed Sanjuansaurus within a monophyletic Herrerasauridae, at the base of Theropoda and including Herrerasaurus and Staurikosaurus. The presence of Sanjuansaurus at the base of the Ischigualasto Formation, along with other dinosaurs such as Herrerasaurus, Eoraptor, Panphagia, and Chromogisaurus suggests that saurischian dinosaurs in southwestern Pangea were already widely diversified by the late Carnian rather than increasing in diversity across the Carnian-Norian boundary. PMID:21594020

Alcober, Oscar A; Martinez, Ricardo N

2010-01-01

7

Facies and stratigraphy of the San Andres formation, northern and northwestern shelves of the Midland basin, Texas and New Mexico  

Microsoft Academic Search

The San Andres Formation on the Northern and Northwestern shelves of the Midland Basin is a progradational stratigraphic unit consisting predominantly of carbonate facies. Lithofacies include dolomite, laminated anhydrite and dolomite, massive bedded anhydrite, limestone, salt, and red beds. These lithofacies represent depositional environments that include deep-water outer shelf, shallow-water inner shelf, shallow-water to emergent shoals, and a sabkha complex

P. J. Ramondetta; D. D. Guetzow; R. Dauzat; R. Merritt; J. Garza

1982-01-01

8

Sedimentology and depositional environments of Lower Permian Yeso Formation in northwestern New Mexico  

SciTech Connect

The northwesternmost exposures of the Lower Permian (Leonardian) Yeso Formation are in uplifts that bound the southern half of the San Juan basin in northwestern New Mexico. The Yeso comprises the Meseta Blanca member and overlying San Ysidro Member. The latter is called the Los Vallos Member in the southern part of the study area. The Meseta Blanca consists of cross-stratified and horizontal to wavy-bedded sandstones of eolian-dune, sand-sheet, and sabkha origin. These facies also occur in the San Ysidro (Los Vallos), which additionally includes mud-draped, ripple-laminated sandstones of supratidal mud-flat origin, gypsiferous sandstones and siltstones of sabkha origin, and evaporite-carbonate rocks of intertidal to marine-shelf origin. Paleocurrent analysis indicates that eolian dunes in the Meseta Blanca migrated southward in the northern part of the study area. These dunes may have been extensions of the DeChelly Sandstone erg to the northwest. Dunes in the southern part of the study area shifted under variable north-south winds. This variability may reflect a seasonal onshore/offshore wind regime. Lateral facies changes in the San Ysidro (Los Vallos) indicate a juxtaposition of eolian-dune and sand-dominated sabkha environments in the northern part of the study area, with coastal-sabkha, tidal, and shelf environments in the southern part. Eolian dunes prograded southward over coastal sabkhas at least 12 times during deposition of the Yeso. A northward shift of all facies during middle San Ysidro deposition suggests a marine transgression from the south.

Stanesco, J.D. (Geological Survey, Denver, CO (USA))

1989-09-01

9

Nahcolite Resources in the Green River Formation, Piceance Basin, Northwestern Colorado  

USGS Publications Warehouse

The U.S. Geological Survey (USGS) recently completed an assessment of in-place nahcolite (NaHCO3) resources in the Piceance Basin, northwestern Colorado. Nahcolite is present in the oil shale deposits of the Parachute Creek Member of the Eocene Green River Formation. It occurs as disseminated aggregates, nodules, bedded units of disseminated brown crystals, and white crystalline beds associated with dawsonite (NaAl(OH)2CO3) and halite (NaCl). The nahcolite-bearing facies are divided into an unleached part containing the nahcolite and halite, which is estimated to be as much as 1,130 ft thick, and an upper leached part several hundred feet thick containing minor nahcolite aggregates and nodules. Locally, thick beds of halite and brown fine-grained nahcolite lie in the depocenter of the basin, but thin laterally away from the basin center and grade into beds of white, coarse-grained nahcolite. In the central part of the study area, the top of the nahcolite-bearing rocks range in depth from about 1,300 to 2,000 ft. Dissolution of water-soluble minerals, mostly nahcolite and halite, in the upper part of the nahcolite-bearing facies has created a collapsed leached zone as much as 580 ft thick that consists of laterally continuous units of solution breccia and fractured oil shale containing solution cavities. The top of the leached zone is not yet defined in the basin, but it probably extends into the A groove in the upper part of the Parachute Creek Member.

Brownfield, Michael E.; Johnson, Ronald C.; Self, Jesse G.; Mercier, Tracey J.

2009-01-01

10

Paleopedology of the Chadron Formation of Northwestern Nebraska: implications for paleoclimatic change in the North American midcontinent across the Eocene–Oligocene boundary  

Microsoft Academic Search

The Big Cottonwood Creek Member is a newly recognized lithostratigraphic unit of the Chadron Formation of northwestern Nebraska. I measured 23 superimposed paleosol profiles within 29m of strata exposed 0.4km (0.25mile) east of the type section of the Big Cottonwood Creek Member at Toadstool Park in northwestern Nebraska and recognized four main types of paleosols. The paleosols are all well

2001-01-01

11

Makah Formation; a deep-marginal-basin sequence of late Eocene and Oligocene age in the northwestern Olympic Peninsula, Washington  

USGS Publications Warehouse

The Makah Formation of the Twin River Group crops out in a northwest-trending linear belt in the northwesternmost part of the Olympic Peninsula, Wash. This marine sequence consists of 2800 meters of predominantly thin-bedded siltstone and sandstone that encloses six distinctive newly named members--four thick-bedded amalgamated turbidite sandstone members, an olistostromal shallow-water marine sandstone and conglomerate member, and a thin-bedded water-laid tuff member. A local unconformity of submarine origin occurs within the lower part of the Makah Formation except in the central part of the study area, where it forms the contact between the older Hoko River Formation and the Makah. Foraminiferal faunas indicate that the Makah Formation ranges in age from late Eocene (late Narizian) to late Oligocene (Zemorrian) and was deposited in a predominantly lower to middle bathyal environment. The Makah Formation is part of a deep-marginalbasin facies that crops out in the western part of the Olympic Peninsula, in southwesternmost Washington and coastal embayments in northwestern Oregon, and along the central part of the coast of western Vancouver Island. On the basis of limited subsurface data from exploratory wells, correlative deep-marginal-basin deposits underlie the inner continental shelf of Oregon and the continental shelf (Tofino basin) along the southwestern side of Vancouver Island. Directional structures in the Makah Formation indicate that the predominantly lithic arkosic sandstone that forms the turbidite packets was derived from the northwest. A possible source of the clastic material is the dioritic, granitic, and volcanic terranes in the vicinity of the Hesquiat Peninsula and Barkley Sound on the west coast of Vancouver Island. Vertical and lateral variations of turbidite facies suggest that the four packets of sandstone were formed as depositional lobes on an outer submarine fan. The thin-bedded strata between the turbidite packets have characteristics of basin-plain and outer-fan fringe deposits.

Snavely, Parke Detweiler; Niem, A.R.; MacLeod, N.S.; Pearl, J.E.; Rau, W.W.

1980-01-01

12

Kizilcaören ore-bearing complex with carbonatites (northwestern Anatolia, Turkey): Formation time and mineralogy of rocks  

NASA Astrophysics Data System (ADS)

The results of isotope-geochronological and mineralogical studies of the rocks making up the Kizilcaören fluorite-barite-REE deposit, northwestern Anatolia, Turkey are discussed in the paper. The ore is a constituent of the subvolcanic complex localized in a large fault zone. The complex combines (from earlier to later rocks): (1) phonolite and trachyte stocks, (2) carbonatite and carbonate-silicate dikelike bodies; and (3) fluorite-barite-bastnaesite ore in the form of thick homogeneous veins and cement in breccia. The K-Ar dating of silicate igneous rocks and carbonatites shows that they were formed in the Chattian Age of the Oligocene 25-24 Ma ago. Mineralogical observations show that the ore is the youngest constituent in the rock complex. Supergene alteration deeply transformed ore-bearing rocks, in particular, resulting in leaching of primary minerals, presumably Ca-Mn-Fe carbonates, and in cementation of the residual bastnaesitefluorite framework by Fe and Mn hydroxides. Most of the studied rocks contain pyrochlore, LREE fluorocarbonates, Nb-bearing rutile, Fe-Mg micas, and K-feldspar. The genetic features of the deposit have been considered. In general, the ore-bearing rock complex is compared in the set of rocks and their mineralogy and geochemistry with deposits of the Gallinas Mountains in the United States, the Arshan and Khalyuta deposits in the western Transbaikalia region, and Mushugai-Khuduk deposit in Mongolia. The Kizilcaören deposit represents a variant of postmagmatic mineralization closely related to carbonatite magmatism associated with alkaline and subalkaline intermediate rocks.

Nikiforov, A. V.; Öztürk, H.; Altuncu, S.; Lebedev, V. A.

2014-02-01

13

Reservoir Properties of the Zonguldak Formation, Located in the Western Black Sea Region, Northwestern Turkey  

NASA Astrophysics Data System (ADS)

The Zonguldak Formation (Westfalian-Stefanian), which is situated in the Western Black Sea basin, is considered to have hydrocarbon potential for coalbed methane (Yalcin and Inan 2001). Additionally, the shale levels of the delta environment of Alacaagzi Formation (Namurian), underline the Zonguldak Formation is considered to have a source rock potential (Derman and Iztan 1997; Sahinturk and Ozcelik 1983). The delta plain of the Zonguldak Formation consists of shales, coals and siliciclastic rocks which have deposited in the lake, marsh and river environment, having ranging from 1000 to 1400 m thickness. The coals and siliciclastics which belong to the formation have persistence in both onshore and offshore. Nevertheless, there have not been published data related to the reservoir rock potential of siliciclastic levels of the Zonguldak Formation which is recognized to have CBM potential. Three deep research wells (Gegendere-1, Amasra -1 and Cakraz-1) have been drilled by TPAO on research area of the Western Black Sea Region to determine the hydrocarbon potential of the Zonguldak Formation. The Yilanli, Alacaagzi, Zonguldak, Cakraz, and Yemislicay formations have been penetrated in the wells. Methane was detected during drilling; but there was no economic detection from DST. The lithology of the Zonguldak formation was characterized through the core and cutting samples taken from the three wells and also thin sections. The petrographic studies were conducted on 44 thin sections, taken from core and cutting samples, indicating that they are fine to medium grained, moderate sorted, litharenite, sublitarenite, feldspathic arenite, carbonaceous mudstone, and quartz arenite composition. Cement materials are mainly clay matrix, and slightly calcite and silica. The XRD and SEM analyze show that the clay types are kaolinite, illite, chlorite and smectite, and high API values from GR logs support that siliciclastics levels have high content clay matrix. Petrographic determinations show that porosity ratio is less than 1%. The core plug samples taken from the Amasra-1 were used to better understanding about the petrophysical properties. Porosity and permeability values are 1,7-2,4% and 0.01-0.03 md, respectively. The petrographic, petropysical, minerological and reservoir rocks analyses on the siliciclastic levels of the Zonguldak Formation indicate that the formation has a poor reservoir potential in the studied wells.

Küçükku?, N.; Ayy?ld?z, T.

2012-04-01

14

New data on the Ladoga transgression, the Neva River formation, and agricultural development of northwestern Russia  

Microsoft Academic Search

The geological history of Lake Ladoga, its connection with the Baltic basin, the formation of the Neva River, and the development of the whole region by people have been studied by Russian and Finnish scholars for a long time. Investigations carried out over the last fifteen years [1?4] have made it possible to obtain new data on the problem; nevertheless,

A. L. Aleksandrovskii; Kh. A. Arslanov; N. N. Davydova; P. M. Doluchanov; G. I. Zaitseva; A. N. Kirpichnikov; D. D. Kuznetsov; M. Lavento; A. V. Ludikova; E. N. Nosov; L. A. Savel’eva; T. V. Sapelko; D. A. Subetto

2009-01-01

15

A New Basal Sauropodomorph (Dinosauria: Saurischia) from Quebrada del Barro Formation (Marayes-El Carrizal Basin), Northwestern Argentina  

PubMed Central

Background Argentinean basal sauropodomorphs are known by several specimens from different basins; Ischigualasto, El Tranquilo, and Mogna. The Argentinean record is diverse and includes some of the most primitive known sauropodomorphs such as Panphagia and Chromogisaurus, as well as more derived forms, including several massospondylids. Until now, the Massospondylidae were the group of basal sauropodomorphs most widely spread around Pangea with a record in almost all continents, mostly from the southern hemisphere, including the only record from Antarctica. Methodology/Principal Finding We describe here a new basal sauropodomorph, Leyesaurus marayensis gen. et sp. nov., from the Quebrada del Barro Formation, an Upper Triassic-Lower Jurassic unit that crops out in northwestern Argentina. The new taxon is represented by a partial articulated skeleton that includes the skull, vertebral column, scapular and pelvic girdles, and hindlimb. Leyesaurus is diagnosed by a set of unique features, such as a sharply acute angle (50 degrees) formed by the ascending process of the maxilla and the alveolar margin, a straight ascending process of the maxilla with a longitudinal ridge on its lateral surface, noticeably bulging labial side of the maxillary teeth, greatly elongated cervical vertebrae, and proximal articular surface of metatarsal III that is shelf-like and medially deflected. Phylogenetic analysis recovers Leyesaurus as a basal sauropodomorph, sister taxon of Adeopapposaurus within the Massospondylidae. Moreover, the results suggest that massospondylids achieved a higher diversity than previously thought. Conclusions/Significance Our phylogenetic results differ with respect to previous analyses by rejecting the massospondylid affinities of some taxa from the northern hemisphere (e.g., Seitaad, Sarahsaurus). As a result, the new taxon Leyesaurus, coupled with other recent discoveries, suggests that the diversity of massospondylids in the southern hemisphere was higher than in other regions of Pangea. Finally, the close affinities of Leyesaurus with the Lower Jurassic Massospondylus suggest a younger age for the Quebrada del Barro Formation than previously postulated. PMID:22096511

Apaldetti, Cecilia; Martinez, Ricardo N.; Alcober, Oscar A.; Pol, Diego

2011-01-01

16

Tectonic control on the evolution of the fluvial systems of the Vinchina Formation (Miocene), northwestern Argentina  

NASA Astrophysics Data System (ADS)

The Miocene Vinchina Formation accumulated in a large foreland basin is related to the uplift of the Andes Mountains. This 5100 m thick unit was mostly deposited in fluvial environments, but short episodes of eolian and lacustrine sedimentation also occurred. Low-angle intraformational unconformities and dramatic facies changes define three depositional sequences. Sequence S1 is composed of sandstones and mudstones deposited in anastomosing river systems during a period of tectonic quiescence. Sequence S2, formed by conglomerates and sandstones with scarce intercalations of mudstones, rests on a low-angle erosional surface and represents deposition in fluvial braided systems. S2 probably resulted from progradation of clastic wedges after an episode of uplift of the fold-thrust belt. Sequence S3, dominated by sandstones, mudstones, and sparse intraformational conglomerates, was deposited in ephemeral braided and meandering rivers governed by a complex balance between subsidence and supply. Fluvial styles in the Vinchina Formation allowed the recognition of three major stages in the foreland basin evolution. During the underfilled stage (S1), high subsidence rates favored the development of axial anastomosing rivers with well-preserved floodplain sediments. Early post-tectonic sedimentation marks initial overfilled conditions (S2), characterized by high sediment supply and progradation of clastic wedges as braided rivers deposits. Finally, more advanced overfilled conditions (S3) were reached when sediment supply matched subsidence, giving birth to ephemeral braided and meandering systems.

Limarino, C.; Tripaldi, A.; Marenssi, S.; Net, L.; Re, G.; Caselli, A.

2001-12-01

17

The Kharapeh orogenic gold deposit: geological, structural, and geochemical controls on epizonal ore formation in West Azerbaijan Province, Northwestern Iran  

Microsoft Academic Search

The Kharapeh gold deposit is located along the northwestern margin of the Sanandaj–Sirjan Zone (SSZ) in the West Azerbaijan\\u000a province, Iran. It is an epizonal orogenic gold deposit formed within the deformed zone between central Iran and the Arabian\\u000a plate during the Cretaceous–Tertiary Zagros orogeny. The deposit area is underlain by Cretaceous schist and marble, as well\\u000a as altered andesite

Shojaeddin Niroomand; Richard J. Goldfarb; Farid Moore; Mohammad Mohajjel; Erin E. Marsh

2011-01-01

18

Lithofacies, age, depositional setting, and geochemistry of the Otuk Formation in the Red Dog District, northwestern Alaska  

USGS Publications Warehouse

Complete penetration of the Otuk Formation in a continuous drill core (diamond-drill hole, DDH 927) from the Red Dog District illuminates the facies, age, depositional environment, source rock potential, and isotope stratigraphy of this unit in northwestern Alaska. The section, in the Wolverine Creek plate of the Endicott Mountains Allochthon (EMA), is ~82 meters (m) thick and appears structurally uncomplicated. Bedding dips are generally low and thicknesses recorded are close to true thicknesses. Preliminary synthesis of sedimentologic, paleontologic, and isotopic data suggests that the Otuk succession in DDH 927 is a largely complete, albeit condensed, marine Triassic section in conformable contact with marine Permian and Jurassic strata. The Otuk Formation in DDH 927 gradationally overlies gray siliceous mudstone of the Siksikpuk Formation (Permian, based on regional correlations) and underlies black organic-rich mudstone of the Kingak(?) Shale (Jurassic?, based on regional correlations). The informal shale, chert, and limestone members of the Otuk are recognized in DDH 927, but the Jurassic Blankenship Member is absent. The lower (shale) member consists of 28 m of black to light gray, silty shale with as much as 6.9 weight percent total organic carbon (TOC). Thin limy layers near the base of this member contain bivalve fragments (Claraia sp.?) consistent with an Early Triassic (Griesbachian-early Smithian) age. Gray radiolarian chert dominates the middle member (25 m thick) and yields radiolarians of Middle Triassic (Anisian and Ladinian) and Late Triassic (Carnian-late middle Norian) ages. Black to light gray silty shale, like that in the lower member, forms interbeds that range from a few millimeters to 7 centimeters in thickness through much of the middle member. A distinctive, 2.4-m-thick interval of black shale and calcareous radiolarite ~17 m above the base of the member has as much as 9.8 weight percent TOC, and a 1.9-m-thick interval of limy to cherty mudstone immediately above this contains radiolarians, foraminifers, conodonts, and halobiid bivalve fragments. The upper (limestone) member (29 m thick) is lime mudstone with monotid bivalves and late Norian radiolarians, overlain by gray chert that contains Rhaetian (latest Triassic) radiolarians; Rhaetian strata have not previously been documented in the Otuk. Rare gray to black shale interbeds in the upper member have as much as 3.4 weight percent TOC. At least 35 m of black mudstone overlies the limestone member; these strata lack interbeds of oil shale and chert that are characteristic of the Blankenship, and instead they resemble the Kingak Shale. Vitrinite reflectance values (2.45 and 2.47 percent Ro) from two samples of black shale in the chert member indicate that these rocks reached a high level of thermal maturity within the dry gas window. Regional correlations indicate that lithofacies in the Otuk Formation vary with both structural and geographic position. For example, the shale member of the Otuk in the Wolverine Creek plate includes more limy layers and less barite (as blades, nodules, and lenses) than equivalent strata in the structurally higher Red Dog plate of the EMA, but it has fewer limy layers than the shale member in the EMA ~450 kilometers (km) to the east at Tiglukpuk Creek. The limestone member of the Otuk is thicker in the Wolverine Creek plate than in the Red Dog plate and differs from this member in EMA sections to the east in containing an upper cherty interval that lacks monotids; a similar interval is seen at the top of the Otuk Formation ~125 km to the west (Lisburne Peninsula). Our observations are consistent with the interpretations of previous researchers that Otuk facies become more distal in higher structural positions and that within a given structural level more distal facies occur to the west. Recent paleogeographic reconstructions indicate that the Otuk accumulated at a relatively high paleolatitude with a bivalve fauna typical of the Boreal realm. A suite of ?13Corg (carbon isotopic composition of carbon) data (n=38)

Dumoulin, Julie A.; Burruss, Robert C.; Blome, Charles D.

2013-01-01

19

Morphology and Phylogenetic Position of the Holodipteran Dipnoans of the Upper Devonian Gogo Formation of Northwestern Australia  

Microsoft Academic Search

Holodipterus (Holodipterus) gogoensis was first described by Miles (Zool. J. Linn. Soc. 61, 1-328 (1977)) from eight specimens from the Frasnian Gogo Formation of the Canning Basin, Western Australia. In 1991 H. longi was described by Campbell & Barwick from a single specimen from the same locality. Subsequent collecting has produced two other new species which we assign to two

P. A. Pridmore; K. S. W. Campbell; R. E. Barwick

1994-01-01

20

THE INSTITUTES AT NORTHWESTERN MEDICINE AT NORTHWESTERN  

E-print Network

with complementary providers to offer whole-person care. The center offers integrative medicine consults, primary of Academic Health Centers in Integrative Medicine, a group of 57 highly esteemed national academic centersTHE INSTITUTES AT NORTHWESTERN MEDICINE INNOVATION ENGINES AT NORTHWESTERN MEDICINE OSHER CENTER

Engman, David M.

21

Spatial and stratigraphic distribution of water in oil shale of the Green River Formation using Fischer assay, Piceance Basin, northwestern Colorado  

USGS Publications Warehouse

The spatial and stratigraphic distribution of water in oil shale of the Eocene Green River Formation in the Piceance Basin of northwestern Colorado was studied in detail using some 321,000 Fischer assay analyses in the U.S. Geological Survey oil-shale database. The oil-shale section was subdivided into 17 roughly time-stratigraphic intervals, and the distribution of water in each interval was assessed separately. This study was conducted in part to determine whether water produced during retorting of oil shale could provide a significant amount of the water needed for an oil-shale industry. Recent estimates of water requirements vary from 1 to 10 barrels of water per barrel of oil produced, depending on the type of retort process used. Sources of water in Green River oil shale include (1) free water within clay minerals; (2) water from the hydrated minerals nahcolite (NaHCO3), dawsonite (NaAl(OH)2CO3), and analcime (NaAlSi2O6.H20); and (3) minor water produced from the breakdown of organic matter in oil shale during retorting. The amounts represented by each of these sources vary both stratigraphically and areally within the basin. Clay is the most important source of water in the lower part of the oil-shale interval and in many basin-margin areas. Nahcolite and dawsonite are the dominant sources of water in the oil-shale and saline-mineral depocenter, and analcime is important in the upper part of the formation. Organic matter does not appear to be a major source of water. The ratio of water to oil generated with retorting is significantly less than 1:1 for most areas of the basin and for most stratigraphic intervals; thus water within oil shale can provide only a fraction of the water needed for an oil-shale industry.

Johnson, Ronald C.; Mercier, Tracey J.; Brownfield, Michael E.

2014-01-01

22

Spatial and stratigraphic distribution of water in oil shale of the Green River Formation using Fischer Assay, Piceance Basin, northwestern Colorado  

USGS Publications Warehouse

The spatial and stratigraphic distribution of water in oil shale of the Eocene Green River Formation in the Piceance Basin of northwestern Colorado was studied in detail using some 321,000 Fischer assay analyses in the U.S. Geological Survey oil-shale database. The oil-shale section was subdivided into 17 roughly time-stratigraphic intervals, and the distribution of water in each interval was assessed separately. This study was conducted in part to determine whether water produced during retorting of oil shale could provide a significant amount of the water needed for an oil-shale industry. Recent estimates of water requirements vary from 1 to 10 barrels of water per barrel of oil produced, depending on the type of retort process used. Sources of water in Green River oil shale include (1) free water within clay minerals; (2) water from the hydrated minerals nahcolite (NaHCO3), dawsonite (NaAl(OH)2CO3), and analcime (NaAlSi2O6.H20); and (3) minor water produced from the breakdown of organic matter in oil shale during retorting. The amounts represented by each of these sources vary both stratigraphically and areally within the basin. Clay is the most important source of water in the lower part of the oil-shale interval and in many basin-margin areas. Nahcolite and dawsonite are the dominant sources of water in the oil-shale and saline-mineral depocenter, and analcime is important in the upper part of the formation. Organic matter does not appear to be a major source of water. The ratio of water to oil generated with retorting is significantly less than 1:1 for most areas of the basin and for most stratigraphic intervals; thus water within oil shale can provide only a fraction of the water needed for an oil-shale industry.

Johnson, Ronald C.; Mercier, Tracey J.; Brownfield, Michael E.

2014-01-01

23

Hydrodynamic potential of upper cretaceous Mesaverde group and Dakota formation, San Juan Basin, northwestern New Mexico and southwestern Colorado  

E-print Network

and sandstone. The Fruitland Formation ranges in thickness from zero on the east side of the basin, owing to truncation prior to Paleocene deposition, to about 500 ft (152 m), but averages about 300 ft (91 m) (Fassett and Hinds, 1971). The Kirtland Shale...). The undivided Farmington Sandstone and upper shale member ranges in thickness from zero on the east to 1, 500 ft (457 m) in the northwest part of the basin. The total Kirtland Shale thine from northwest to southeast across the San Juan Basin owing...

Dougless, Thomas Clay

2012-06-07

24

Archean Age Fossils from Northwestern Australia (Approximately 3.3 to 3.5 GA, Warrawoona Group, Towers Formation)  

NASA Technical Reports Server (NTRS)

Archean aged rocks from the Pilbara Block area of western Australia (Warrawoona Group, Towers Formation, -3.3-3.5 Ga) contain microfossils that are composed of various sizes of spheres and filaments. The first descriptions of these microfossils were published in the late 1970's (Dunlop, 1978; Dunlop, et. al., 1978). The authenticity of the microfossils is well established. The small size of the microfossils prevents isotope dating, at least with the present technology. Microbiologists, however, have established guidelines to determine the authenticity of the Archean aged organic remains (Schopf, Walter, 1992).

Smith, Penny A. Morris

1999-01-01

25

Monitoring of Intense Events of Deep Water Formations in the Northwestern Mediterranean over the last five years  

NASA Astrophysics Data System (ADS)

A multi-platforms and integrated monitoring system in the framework of the Mediterranean Ocean Observing System on Environment (MOOSE) enables to monitor the deep water formation processes. Since 2007, it provides high frequency in-situ temperature, salinity vertical profiles, derived from CTD measurements on moorings, ships, and gliders, as well as horizontal and vertical currents from moorings. The aim of this study is to investigate the temporal scales associated to the deep convection phases. We also studied the interannual variability of the deep convection and its implication in the evolution of deep water thermohaline characteristics. Recent measurements from the mooring lines reveal the temporal evolution of the physical processes interfering in the phases of deep convection. Horizontal currents were strongly equivalent barotropic during each deployment and strong currents were also recorded during the different events of deep ocean convection: high frequencies vertical velocities exceeded 10 cm.s-1 during the violent vertical mixing phase and strong mesoscale horizontal currents reached 40cm.s-1 during the spreading/restratification phase. Using a eddy-detection method based on a kinematic model, more than 34 eddies crossing the mooring line were detected between November 2009 and July 2012, 19 cyclones and 15 anticyclones. The radii (resp. velocities) ranging from 1.9 km to 20.0 km (resp. 2.5 cm.s-1 to 25.1 cm.s-1 ). The main mode of the distribution of eddies radii is centered at 4km for the cyclones and 5km for the anticyclones. The apparition of newly-formed deep waters was detected in winter 2009, 2010, 2011 and 2012. In winter 2010, two newly-formed deep waters were detected after the deep convection event, both present a different potential temperature but a similar salinity, suggesting that both might be formed in the cyclonic gyre, but in different locations. In 2012, two new deep waters were detected at the mooring location, one was identified as a result of open-ocean deep convection, while the other seems to be the result of a dense shelf water cascading event that occurred in winter 2012.

Houpert, Loïc; Durrieu de Madron, Xavier; Testor, Pierre; Bosse, Anthony; Mortier, Laurent

2014-05-01

26

NORTHWESTERN UNIVERSITY VETERANS AND  

E-print Network

NORTHWESTERN UNIVERSITY VETERANS AND Individuals WITH Disabilities JOB FAIR Northwestern University is Pleased to Announce its 2nd Annual Veterans and Individuals with Disabilities JOB FAIR! In honor and recognition of Veterans and National Disability Employment Awareness Month, you are invited to come out

Staum, Jeremy

27

Research Computing at Northwestern University  

E-print Network

Advanced Research Computing at Northwestern University 2014­2015 Northwestern University University Library and NUIT have partnered on the development of new research computing consulting space & Proposal Consultation: One-on-one consultation for defining requirements for research computing, authoring

Shahriar, Selim

28

AT NORTHWESTERN SKIN CANCER INSTITUTE  

E-print Network

THE CANCER INSTITUTES AT NORTHWESTERN MEDICINE SKIN CANCER INSTITUTE THE INSTITUTES AT NORTHWESTERN MEDICINE #12;THE INSTITUTES AT NORTHWESTERN MEDICINE "Through the Skin Cancer Institute, we are endeavoring to reverse the growing incidence of all forms of skin cancer by contributing breakthroughs and innovations

Engman, David M.

29

Northwestern University University Police  

E-print Network

Northwestern University University Police 1819 Hinman Avenue Evanston, Illinois 60208-1320 KELLOGG / Publication 3 University Police 4 Crime and Emergency Reporting 4 Campus Security Authorities 5 Timely Prevention Act 21 Sexual Assault Prevention 22 University Police Crime Prevention and Safety Programs 22

Apkarian, A. Vania

30

Northwestern University University Police  

E-print Network

Northwestern University University Police 1201 Davis Street Evanston, Illinois 60208-1320 MEDILL 3 University Police 4 Crime, Emergency Reporting and Response 4 Campus Security Authorities 5 TimelyPoint 24 Campus Sex Crimes Prevention Act 25 SexualViolence Prevention 25 University Police Crime

Shahriar, Selim

31

Northwestern University University Police  

E-print Network

Northwestern University University Police 1201 Davis Street Evanston, Illinois 60208-1320 KELLOGG / Publication 3 University Police 4 Crime, Emergency Reporting and Response 4 Campus Security Authorities 5Point 24 Campus Sex Crimes Prevention Act 25 SexualViolence Prevention 25 University Police Crime

Shahriar, Selim

32

Northwestern University University Police  

E-print Network

Northwestern University University Police 1201 Davis Street Evanston, Illinois 60208-1320 EVANSTON Collection / Publication 3 The Role of the University Police Department 5 Crime, Emergency Reporting) 26 Blue Light Police Emergency Phones 26 Access to Campus Facilities and Building Security 27 Fire

Shahriar, Selim

33

Northwestern University University Police  

E-print Network

Northwestern University University Police 1819 Hinman Avenue Evanston, Illinois 60208-1320 EVANSTON Collection / Publication 3 The Role of the University Police Department 4 Crime and Emergency Reporting 5 Safety in University Residences 21 Safety After Dark (Transportation) 22 Blue Light Police Emergency

Apkarian, A. Vania

34

Northwestern University Transportation Center  

E-print Network

Northwestern University Transportation Center 2011 Business Advisory Committee NUTC #12;#12;I have the pleasure of presenting our Business Advisory Committee members--a distinguished group of transportation industry lead- ers who have partnered with the Transportation Center in advancing the state of knowledge

Bustamante, Fabián E.

35

Zafar Rafii Northwestern University  

E-print Network

/Percussive Separation using Kernel Additive Modelling," 25th IET Irish Signals and Systems Conference, Limerick, Ireland://music.eecs.northwestern.edu EDUCATION 2008-2014 PhD in Computer Science (+ Certificate in Cognitive Science) Thesis: "Source Separation Pardo. "Acoustic Separation System and Method," US Patent No. 20,130,064,379. 14 March 2013. Journal

Pardo, Bryan

36

Discover Northwestern: Chicago Campus  

E-print Network

of the largest and most accessible public transportation systems in the United States. Have you ever calculated- The Northwestern University Chicago campus is located in the heart of downtown Chicago. There are many For convenient commuting, ride the Metra. Metra serves Cook, DuPage, Lake, Will, McHenry, and Kane counties

Shahriar, Selim

37

NORTHWESTERN EDUCATION AND  

E-print Network

such as professor Miriam Sherin's discussion of classroom videos. A new Center for Education Design and Leadership. While new technologies foster these connections, they are being invented and changing at a rate Policy (SESP) at Northwestern University, we embrace the new landscape of not just the "Northwest

Bustamante, Fabián E.

38

Residential Colleges NORTHWESTERN  

E-print Network

the year. #12;3 How did residential colleges start at Northwestern? In the late 1960s, a faculty committee three dozen to 300 students and in focus from science, busi ness, and the arts to the more inclusive. Five residential colleges opened in fall 1972, and since then, the program has continued to grow

Shull, Kenneth R.

39

Welcome to the Northwestern  

E-print Network

: Students begin to realize they will soon be leaving home, family, friends, and the security that each � Northwestern University's office is designed to assist new students in their transition to college and provide! #12;� Phases adapted from Helping your first-year college student succeed: A guide for parents (Hatch

Staum, Jeremy

40

INSTITUTES AT NORTHWESTERN  

E-print Network

drugs and other novel approaches to diagnose and treat cancer, we identify unique windows of opportunityTHE CANCER INSTITUTES AT NORTHWESTERN MEDICINE DEVELOPMENTAL THERAPEUTICS INSTITUTE THE INSTITUTES is having a palpable impact on the lives of those fighting cancer or other life-threatening disorders

Engman, David M.

41

Northwestern University Recombinant DNA  

E-print Network

Northwestern University Recombinant DNA Safety Program Office of Research Safety Office of the Vice deoxyribonucleic acid (DNA) shall comply with the National Institute of Health's "Guidelines for Research Involving Recombinant DNA Molecules" (NIH Guidelines) as published in the Federal Register (www

Shull, Kenneth R.

42

INNOVATION ENGINES AT NORTHWESTERN  

E-print Network

in the treatment of inflammatory arthritis, the Division of Rheumatology at Northwestern University Feinberg School are experts and thought leaders in the treatment of rheumatoid arthritis. In addition, Eric M. Ruderman, MD and translational research and laboratory-based translational studies. Rheumatoid Arthritis Our physicians

Engman, David M.

43

Geohydrology of the aquifers that may be affected by the surface mining of coal in the Fruitland Formation in the San Juan Basin, northwestern New Mexico  

USGS Publications Warehouse

A monitoring network of 50 wells was installed from 1975 to 1979 in the surface-mineable coal area. The purpose of the network was to collect hydrologic data and to establish a data base. The hydrologic data consist of water level measurements, water chemistry, and selected aquifer characteristics. The four aquifers considered in this study are: (1) The Pictured Cliffs Sandstone; (2) coal seams and interbedded lithologic units of the Fruitland Formation; (3) overburden of the Kirtland Shale and Fruitland Formation; and (4) the alluvium along the Chaco River and its eastern and northeastern tributaries. Five sites were selected for study. Four of these sites, Western Coal Company 's lease near Fruitland, Bisti West, Kimbeto, and Ojo Encino, have surface-mineable coal. The Chaco River alluvium was selected because it is downstream from anticipated mining activity. The specific conductances of the representative water samples from selected wells in the 4 aquifers in the 5 study areas ranged from 800 to 23,000 microsiemens/cm at 25 C. The dominant cation in all samples was sodium. The water is brackish in the Pictured Cliffs Sandstone and in the coal seams and interbedded lithologic units of the Fruitland Formation. It is fresh to saline in the overburden of the Fruitland Shale and Fruitland Formation, and fresh to brackish in the Chaco River alluvium. (Author 's abstract)

Myers, R.G.; Villanueva, E.D.

1986-01-01

44

Postdoctoral Positions Available Northwestern University  

E-print Network

of approaches including biochemistry, molecular biology, genetics, genomics, cell culture, electrophysiology, immunofluorescence, Drosophila or mouse genetics is highly preferred but not essential. Northwestern University and highly motivated individuals to join the lab. Postdoctoral positions are available immediately

Allada, Ravi

45

THE INSTITUTES AT NORTHWESTERN MEDICINE THE HEART INSTITUTES  

E-print Network

like heart transplantation and minimally invasive procedures to cure atrial fibrillation, we remainTHE INSTITUTES AT NORTHWESTERN MEDICINE THE HEART INSTITUTES AT NORTHWESTERN MEDICINE #12;THE INSTITUTES AT NORTHWESTERN MEDICINE THE HEART INSTITUTES AT NORTHWESTERN MEDICINE "At the Bluhm

Engman, David M.

46

NORTHWESTERN UNIVERSITY COMMENCEMENT SPEAKERS, 1892-2013 Northwestern University Archives www.library.northwestern.edu/archives/1  

E-print Network

Adolph Maurice Wickman Dean Lake Traxler Owen Lewis Coon Andrew Nedessen Johnson 1916 Joseph James Lemen SPEAKERS, 1892-2013 Northwestern University Archives www.library.northwestern.edu/archives/3 1951 Louis S

Shahriar, Selim

47

Departments | Centers | Institutes Northwestern University Feinberg School of Medicine  

E-print Network

Prosthetics- Orthotics Center Northwestern University Parkinson's Disease and Movement Disorders Center University Interdepartmental Neuroscience Program Northwestern University Prosthetics Research Laboratory

Chisholm, Rex L.

48

Website: www.northwestern.edu/careers Fan UCS @ www.facebook.com/northwesternUCS  

E-print Network

://www.sesp.northwestern.edu/ugrad/opportunities/research/ Weinberg College of Arts & Sciences Chicago Field Studies, CFS Scholars Fund http-491-3700 Funding for Unpaid Internships or Research University Career Services Summer Internship Grant Program://www.communication.northwestern.edu/epics/internships Contact: epics@northwestern.edu Northwestern University University Career Services School of Education

Shull, Kenneth R.

49

Northwestern Engineering Electrical Engineering & Computer Science  

E-print Network

McCormick Northwestern Engineering 1 Electrical Engineering & Computer Science Learning to Group- keng Liao, Alok Choudhary Dept. of Electrical Engineering and Computer Science Center for Ultra.northwestern.edu #12;McCormick Northwestern Engineering 2 Electrical Engineering & Computer Science Introduction

Kuzmanovic, Aleksandar

50

CELESTE WATKINS-HAYES Northwestern University Northwestern University  

E-print Network

, Cells to Society (C2S): The Center on Social Disparities and Health, 2007 - present - Faculty Fellow. of African American Studies 1810 Chicago Avenue 1860 Campus Drive, Crowe 5-128 Evanston, IL 60208 EvanstonBPROFESSIONAL EXPERIENCE Northwestern University, 2003 ­ present Associate Professor of Sociology and African

51

Northwestern University Student Handbook 201314  

E-print Network

on Campus 36 Computer and Telecommunications Equipment, Facilities, and Services 36 Computers and Networks 37 tABLE oF contEntS #12;www.northwestern.edu/studentaffairs 3 Crime and Safety Information 40 and Sorority Recruitment for First-Year Students 46 Gambling 47 Hate Crimes and Bias Incidents/ Respect NU 47

Shahriar, Selim

52

Frances Searle Building Northwestern University  

E-print Network

.northwestern.edu Leslie DeChurch Assistant Professor Organizational Psychology, University of Central Florida If you would, knowledge specialties, geographic locations, and organizational boundaries. Often times the goals these systems face are complex and multifaceted requiring multi- ple distinct teams to coordinate their efforts

Bustamante, Fabián E.

53

Office for RESEARCH Northwestern University  

E-print Network

. Photo by Andrew Campbell. Dorothy Roberts, Kirkland & Ellis Professor of Law, joined Northwestern more about their research on page 21. Photo by Andrew Campbell. Miriam Gamoran Sherin is associate and Treasurer Writers Amanda B. Morris Joan T. Naper Published annually by the Office for Research Jay Walsh

Shahriar, Selim

54

Stratigraphy, Sedimentology, Volcanology and Development of the Archean Manitou Group, Northwestern Ontario, Canada  

Microsoft Academic Search

The Archean Manitou Group occurs as a northeast-southwest trending arcuate belt in the central part of the Wabigoon greenstone belt, northwestern Ontario. The Manitou Group is mainly conglomerate, sandstone, tuff, tuff-breccia, and argillite, with minor lavas (somewhat alkaline), and iron formation. Mapping has established four formations: the Cane Lake, Sunshine Lake, Uphill Lake, and Mosher Bay. The Uphill Lake includes

Philip Rae Teal

1979-01-01

55

A Nearly Modern Amphibious Bird from the Early Cretaceous of Northwestern China  

Microsoft Academic Search

Three-dimensional specimens of the volant fossil bird Gansus yumenensis from the Early Cretaceous Xiagou Formation of northwestern China demonstrate that this taxon possesses advanced anatomical features previously known only in Late Cretaceous and Cenozoic ornithuran birds. Phylogenetic analysis recovers Gansus within the Ornithurae, making it the oldest known member of the clade. The Xiagou Formation preserves the oldest known ornithuromorph-dominated

Hai-lu You; Matthew C. Lamanna; Jerald D. Harris; Luis M. Chiappe; Jingmai O'Connor; Shu-an Ji; Jun-chang Lü; Chong-xi Yuan; Da-qing Li; Xing Zhang; Kenneth J. Lacovara; Peter Dodson; Qiang Ji

2006-01-01

56

Corporate Health Services Northwestern Medical Group  

E-print Network

QUESTIONNAIRE (continued) 10. Please list any history of heart disease, lung disease, chronic liver disease transplantation, sick cell anemia, and spleen injury. None #12; Corporate Health Services Northwestern

Contractor, Anis

57

Middle cretaceous carbonate reservoirs, Fahud Field and northwestern Oman: discussion  

SciTech Connect

A discussion is presented of the Cretaceous formations involved in Fahud field. Along the Trucial Coast, as in northwestern Oman, it is not difficult to date the time of formation of the foredeep. This article provides a stratigraphic correlation chart for the Cretaceous along the Arabian side of the Arabian Gulf. The terminology presented on this correlation chart reflects oil-industry usage in the area, including correlations published by Owen and Nasr, Loutfi and Jaber, Arabian American Oil Company, Beydoun and Dunnington, and Hassan et al.

Brennan, P.

1985-05-01

58

Northwestern University Staff Conflict of Interest  

E-print Network

. This policy establishes a standard of conduct to enhance the reputation of the University and its employees and to protect the financial well-being, reputation, and legal obligations of the University. University staffNorthwestern University Staff Conflict of Interest June 1, 2008 #12;NORTHWESTERN UNIVERSITY Page 1

Chisholm, Rex L.

59

Northwestern University Audiology Clinic 2240 Campus Drive  

E-print Network

Northwestern University Audiology Clinic 2240 Campus Drive Evanston, IL 60208 Phone: 847-491-3165 FAX: 847-467-0410 HEARING AID DISPENSING POLICY EVALUATION: Northwestern University Audiology Clinic offers a comprehensive audiologic program for those individuals who can benefit from hearing aid use

60

Northwestern Engineering Electrical Engineering & Computer Science  

E-print Network

McCormick Northwestern Engineering 1 Electrical Engineering & Computer Science SES: Sentiment, Diana Palsetia, Kathy Lee, Wei-keng Liao, Alok Choudhary Dept. of Electrical Engineering and Computer Mining Vancouver, Canada, December 2011 #12;McCormick Northwestern Engineering 2 Electrical Engineering

Kuzmanovic, Aleksandar

61

Research Data Storage Services at Northwestern University  

E-print Network

researchers and post docs with alternatives for storing and sharing computational data in a scalable, reliable/services/storage/ Quest Cluster Overview: www.it.northwestern.edu/research/services/quest/ Research Computing ServicesResearch Data Storage Services at Northwestern University Research Data Storage services

Chisholm, Rex L.

62

NORTHWESTERN UNIVERSITY Animal Care and Use Committee  

E-print Network

NORTHWESTERN UNIVERSITY Animal Care and Use Committee Reporting Concerns Regarding Animal Treatment All animals used at Northwestern University (NU) must be handled, housed, treated, cared for person having reason to question the treatment of animals at NU is encouraged to report incidents

Shahriar, Selim

63

Middle Cretaceous carbonate reservoirs, Fahud field and northwestern Oman  

SciTech Connect

Reservoir facies in Fahud field and throughout northwestern Oman are in shallow-shelf carbonates of the middle Cretaceous Mishrif and Mauddud Formations. Interparticle porosity formed in the Mishrif as sand aprons of lithoclast and skeletal grainstones surrounding fault-block islands, and less commonly in the Mauddud as biostromes of rudist packstones. Moldic porosity after fine rudist debris is more common than interparticle porosity and occurs in thicker stratigraphic units, interpreted to have formed locally in meteoric-water lenses associated with islands, and regionally during subaerial exposure associated with sea level lows.

Harris, P.M.; Frost, S.H.

1984-05-01

64

Middle Cretaceous carbonate reservoirs, Fahud field and northwestern Oman  

SciTech Connect

Reservoir facies in Fahud field and throughout northwestern Oman are in shallow-shelf carbonates of the middle Cretaceous Mishrif and Mauddud Formations. Interparticle porosity formed in the Mishrif as sand aprons of lithoclast and skeletal grainstones surrounding fault-block islands and less commonly in the Mauddud as biostromes of rudist packstones. Moldic porosity after fine rudist debris is more common than interparticle porosity and occurs in thicker stratigraphic units, interpreted to have formed locally in meteoric-water lenses associated with islands, and regionally during subaerial exposure associated with sea level lows. 8 references, 9 figures.

Harris, P.M.; Frost, S.H.

1984-05-01

65

The Idaho cobalt belt, northwestern United States --- A metamorphosed Proterozoic exhalative ore district  

Microsoft Academic Search

In the Idaho cobalt belt, originally exhalative, stratiform mineralization within the Proterozoic Yellow-jacket Formation has become increasingly coarse-grained and remobilized toward the northwest in the direction of increasing regional metamorphic grade. The Idaho cobalt belt is located about 40 km west of Salmon, Idaho in the northwestern United States. The most important deposit in the district is the Blackbird mine

J. L. Nold

1990-01-01

66

Geochemistry of the Enjerd Skarn and Its Association with Copper Mineralization, Northwestern Iran  

Microsoft Academic Search

The Enjerd skarn is located 28 km northwest of Ahar in East Azarbaijan Province, northwestern Iran. Based on mineral composition, paragenesis, and mineral relationships, two stages of hydrothermal alteration and related mineralization have been identified. Stage I was produced by early pulses of Fe-rich, magmatically derived fluids coincident with potassic alteration of the main stock. This event caused the formation

Ardeshir Hezarkhani

2006-01-01

67

NORTHWESTERN UNIVERSITY OFFICE OF RESEARCH SAFETY  

E-print Network

NORTHWESTERN UNIVERSITY OFFICE OF RESEARCH SAFETY 2006 GUIDE TO SHIPPING DRY ICE #12;2 TABLE ...............................................................................................................................3 IV. Packaging Dry Ice..............................................................................................8 Appendix A. Record of Training for Dry Ice Shipping

Shull, Kenneth R.

68

NORTHWESTERN UNIVERSITY FEINBERG SCHOOL OF MEDICINE  

E-print Network

care. We will discuss low health literacy in neurology and the importance to adherence. Finally, we will step back to examine access to neurological care and education NORTHWESTERN UNIVERSITY FEINBERG SCHOOL OF MEDICINE DEPARTMENT OF NEUROLOGY

Contractor, Anis

69

NORTHWESTERN UNIVERSITY Department of Art History  

E-print Network

AH_260 NORTHWESTERN UNIVERSITY Department of Art History INTRO TO CONTEMPORARY ART AND ITS (roughly 1960-tomorrow) with a particular emphasis on the social and political engagements that have, institutional critique, popular protest, media accountability, war, migration, corporatization, and urban

70

Departments | Centers | Institutes Northwestern University Feinberg School of Medicine  

E-print Network

Departments | Centers | Institutes Northwestern University Feinberg School of Medicine The Northwestern University Feinberg School of Medicine has many excellent departments, centers, institutes offerings with the creation of the Institute for Public Health & Medicine, which combined interdisciplinary

Chisholm, Rex L.

71

Lauren Mohr Miller Dept. of Mechanical Engineering, Northwestern University  

E-print Network

Engineering Graduate Student Society 2012-2013 Mentor, Northwestern University Society of Women Engineers 2011), IEEE Control Systems Society (CSS), Society of Women Engineers (SWE) Referee: IEEE Transactions, optimal control and estimation Education 2015 Northwestern University Evanston, IL (expected) Ph

Hartmann, Mitra J. Z.

72

The age and tectonic setting of the Puncoviscana Formation in northwestern Argentina: An accretionary complex related to Early Cambrian closure of the Puncoviscana Ocean and accretion of the Arequipa-Antofalla block  

NASA Astrophysics Data System (ADS)

TIMS and SHRIMP U-Pb zircon geochronology of selected parts of the Puncoviscana Formation suggest its deposition took place mainly during the Early Cambrian, coeval with 540-535 Ma calc-alkaline Pampean arc volcanism mainly preserved as tuff beds in the oldest identified parts of this unit. Syn- to post-tectonic plutons constrains the Tilcarian-Pampean orogeny to have occurred between ca. 530 Ma and deposition of the unconformably overlying Middle-Upper Cambrian Meson Group. Deposition of the Puncoviscana Formation continued after the onset of the Tilcarian-Pampean orogeny. We propose that the Puncoviscana Formation rocks older than 530 Ma were deposited in the arc-trench gap of the west-facing Pampean arc and/or the associated trench, whereas the rocks younger than 530 Ma were deposited in a syn-collision foreland basin. The Puncoviscana Formation rocks were progressively assembled into a west-younging accretionary complex, consistent with the style of deformation and low-grade metamorphism. The age of the syn-collision plutons (?530 Ma) suggest the foredeep deposits record the transition from trench to foreland basin, due to arrival of the Arequipa-Antofalla block at the west-facing trench at ca. 530 Ma. Our geochronological and Pb-isotope investigations suggest that the Arequipa-Antofalla terrane was a coherent, ribbon-shaped crustal block that also included the western part of the Pampia terrane. A compilation of existing U-Pb zircon studies suggests that the Pampean arc extended along the length of the proto-Andean margin of West Gondwana, represented by the previously amalgamated Amazonia and Rio de La Plata cratons, and probably was initiated during the late Ediacaran after 600 Ma. Following earlier workers, we reaffirm that the Arequipa-Antofalla block was originally separating Laurentia and Amazonia in Rodinia. It probably rifted from Laurentia during the Ediacaran between 600 and 570 Ma, following an earlier departure of Amazonia (˜650 Ma?). The separation of Arequipa-Antofalla from Amazonia and Laurentia opened the Puncoviscana and Iapetus oceans respectively.

Escayola, Mónica P.; van Staal, Cees R.; Davis, William J.

2011-12-01

73

Middle proterozoic compressional orogen in northwestern Canada  

Microsoft Academic Search

Evidence from seismic reflection profiling, drill holes, potential field measurements and regional geology shows that an east verging Proterozoic thin-skinned thrust and fold belt is situated beneath the Interior Platform of northwestern Canada. Balanced cross sections and associated palinspastic reconstructions provide constraints on the extent of the shortening in the thrust belt and suggest that at least 50-90 km of

Frederick A. Cook

1988-01-01

74

The Politicization of Black Students: Northwestern University  

ERIC Educational Resources Information Center

A discussion of the past and current political context of black college enrollment which focuses on the Northwestern University campus social order and the norms brought to it by blacks, analyzing in detail the politicization process for black students between 1966 and 1969. The objectives are to explain fluctuations in black student political…

Pitts, James P.

1975-01-01

75

THE INSTITUTES AT NORTHWESTERN MEDICINE FOR TRANSLATIONAL  

E-print Network

interrelated missions. Our first mission is to care for patients with neurological diseases that undermine Center offers a unique synthesis of patient care, training, and research in an area of immense importance MEDICINE COGNITIVE NEUROLOGY AND ALZHEIMER'S DISEASE CENTER #12;THE INSTITUTES AT NORTHWESTERN MEDICINE

Engman, David M.

76

NorthwesternUniversity Feinberg School of Medicine  

E-print Network

Professor Department of Physical Therapy and Human Movement Sciences The Department of Physical Therapy". The department has one of the leading physical therapy education programs in the United States, training entryNorthwesternUniversity Feinberg School of Medicine Director of Clinical Education/Assistant

Contractor, Anis

77

Northwestern Hawaiian Islands Coral Reef Ecosystem Reserve  

NSDL National Science Digital Library

This page describes the unique Northwestern Hawaiian Islands (NWHI) Ecosystem Reserve. Provides resources focused on NWHI coral reef ecosystems, and introductions to reef research, management and protection activities. Educational outreach includes: teacher workshops; student activities, and a Discovery Center in Hilo, Hawaii that features exhibits and activities for schools and the public.

2011-04-22

78

NORTHWESTERN UNIVERSITY DEPARTMENT OF MICROBIOLOGY-IMMUNOLOGY  

E-print Network

. Bayar Thimmapaya "Contribution of Merkel Cell Polyomavirus to Merkel Cell Carcinoma" 3-5224 Nov. 26 Restricted T Cells in Autoimmunity" 3-9748 Oct. 1 John Brooks, Northwestern Univ. (DGP) Dr. Mark Mandel. 12 Stephen C. Jameson, Ph.D., Univ. of Minnesota Students & Postdocs "CD8+ T Cell Memory: Exploring

Chisholm, Rex L.

79

Northwestern University Office of Human Resources  

E-print Network

Act (FLSA) Background and Purpose The Fair Labor Standards Act (FLSA) is a U.S. Federal Law enacted child labor Set minimum wage Require overtime pay Require equal pay (prohibit sex based wageNorthwestern University Office of Human Resources 1 Exempt or Not Exempt? The Fair Labor Standards

Shahriar, Selim

80

Lake Trout Movements in Northwestern Lake Michigan  

Microsoft Academic Search

We quantified the distance that lake troutSalvelinus namaycushmoved in northwestern Lake Michigan and examined (1) the directional preference and (2) the effect of population density on movement. Lake trout were captured in spring and fall 1983-1996, tagged with Floy anchor tags, and recaptured during subsequent agency sampling and by commercial fishers and anglers during 1983-1997. Angler recaptures were used to

Patrick J. Schmalz; Michael J. Hansen; Mark E. Holey; Patrick C. McKee; Michael L. Toneys

2002-01-01

81

Northwestern New Mexico Uranium Milling Region  

Microsoft Academic Search

Land distribution statistics in Table 3.5-1 were calculated using the Geographic Information System used to construct the map shown in Figure 3.5-1. The data show that 91 percent of the Northwestern New Mexico Uranium Milling Region is composed of private (surface ownership) land (50 percent), Indian Reservation land (27 percent), and U.S. national forest land (14 percent). Indian Reservation land,

McKinley County

82

Basin development, petrology, and paleogeography - Early Permian carbonates, northwestern Bolivia  

SciTech Connect

Early Permian carbonate rocks of the Yaurichambi Formation in northwestern Bolivia demonstrate in-situ, low-paleolatitude development within a complexly interbedded sequence punctuated by siliciclastics apparently derived from a western source. The Yaurichambi Formation (Copacabana Group) occurs above a regional caliche surface that caps Upper Carboniferous quartzarenites. Lower beds of the formation are characterized by interbedded carbonate and quartz-rich lithologies. This interval is gradationally overlain by a shallowing-upward, carbonate-dominated sequence. Mud-rich wackestones and packstones grade upward to bioclastic packstones and grainstones. Common allochems in bioclastic-rich lithologies include echinoderms, brachiopods, fenestrate bryozoans, intraclasts, and less common corals. Uppermost beds contain abundant siliciclastic interbeds. Where exposed, this carbonate sequence is terminated by the Tiquina Sandstone. Permian rocks were deposited in a northwest-southeast-oriented basin. Siliciclastic flooding from the western and southwestern margin of the basin dominated throughout the Carboniferous and occurred intermittently during the Permian, with apparent shallowing to the south. A low-latitude paleogeographic setting for these rocks is indicated by the carbonate lithologies dominating the Lower Permian sequence. Sedimentary and diagenetic features diagnostic of semi-arid warm-water deposition include penecontemporaneous dolomites, fenestral fabric, and calcretes. Furthermore, the faunas are similar to those found in equivalent strata of the Permian basin area of west Texas, indicating that deposition occurred at relatively low latitudes.

Canter, K.L.; Isaacson, P.E. (Univ. of Idaho, Moscow (USA))

1990-05-01

83

www.law.northwestern.edu www.law.northwestern.edu | 1  

E-print Network

or fewer students. 1L #12;www.law.northwestern.edu | 5 Teamwork and communication skills are strongly, and interact with their counterparts from other nations and different cultures. Strengthening teamwork and communication skills The modern world of legal practice and business is dominated by the use of multifunctional

Apkarian, A. Vania

84

Origin of mafic magmas beneath northwestern Tibet: Constraints from 230  

E-print Network

Origin of mafic magmas beneath northwestern Tibet: Constraints from 230 Th-238 U disequilibria Kari the Ashikule Basin (AKB) in northwestern Tibet provide constraints on the origin of magmas produced within to explain melt generation beneath northern Tibet. The measured 230 Th enrichments are uncharacteristic

Dunbar, Nelia W.

85

Internship Search Survey 2011 Northwestern University Career Services  

E-print Network

Internship Search Survey 2011 Northwestern University Career Services Executive Summary The Internship Search Survey conducted by Northwestern University Career Services (UCS) was formally introduced searching for an internship. The survey was hosted and data was collected from StudentVoice, an online

Shull, Kenneth R.

86

Internship Search Timeline University Career Services Northwestern University  

E-print Network

Internship Search Timeline University Career Services Northwestern University Research your is a general internship search timeline designed to help you organize and conduct an effective internship search. September/October Register with Northwestern's CareerCat and iNet. Sign-up for the Internship

Shull, Kenneth R.

87

Internship Search Survey 2011-2012 Northwestern University Career Services  

E-print Network

Internship Search Survey 2011-2012 Northwestern University Career Services Executive Summary The Internship Search Survey conducted by Northwestern University Career Services (UCS) was formally introduced searching for an internship. The survey was hosted and data was collected from Campus Labs, an online survey

Shull, Kenneth R.

88

Summer Internship Grant Program (SIGP) University Career Services Northwestern University  

E-print Network

Summer Internship Grant Program (SIGP) University Career Services Northwestern University Facebook to develop SIGP to fund stipends for students completing unpaid summer internships. In addition to money of $2500 each for students completing unpaid summer internships. Who is eligible for SIGP? Any Northwestern

Shull, Kenneth R.

89

Internship Search Survey 2010 Northwestern University Career Services  

E-print Network

Internship Search Survey 2010 Northwestern University Career Services Executive Summary The Internship Search Survey conducted by Northwestern University Career Services (UCS) was formally introduced searching for an internship. The survey was hosted and data was collected from StudentVoice, an online

Shull, Kenneth R.

90

PAIN MEDICINE CENTER INSTITUTE FOR TRANSLATIONAL NEUROSCIENCE AT NORTHWESTERN MEDICINE  

E-print Network

PAIN MEDICINE CENTER INSTITUTE FOR TRANSLATIONAL NEUROSCIENCE AT NORTHWESTERN MEDICINE Pain diseases such as diabetes and stroke. The outpatient Pain Medicine Center within the Department of Anesthesiology at Northwestern Medicine offers hope to patients with chronic pain. Starting with a comprehensive

Engman, David M.

91

NorthWestern Energy Community Works Scholarship for Electrical Engineering  

E-print Network

20131030 NorthWestern Energy Community Works Scholarship for Electrical Engineering A special Electrical Engineering, NorthWestern Energy has established a scholarship program administered by the Montana and interests, and how they relate to electrical engineering, energy production, control, and/or transmission

Dyer, Bill

92

NorthWestern Energy Community Works Scholarship for Electrical Engineering  

E-print Network

20121204 NorthWestern Energy Community Works Scholarship for Electrical Engineering A special new Electrical Engineering, NorthWestern Energy has established a scholarship program administered by the Montana, and how they relate to electrical engineering, energy production, control, and/or transmission. Within

Lawrence, Rick L.

93

NORTHWESTERN UNIVERSITY PHYSICAL THERAPY ALUMNI ASSOCIATION ARTICLE I. NAME  

E-print Network

1 NORTHWESTERN UNIVERSITY PHYSICAL THERAPY ALUMNI ASSOCIATION BY-LAWS ARTICLE I. NAME The name of this Association is the Northwestern University Physical Therapy Alumni Association, hereinafter referred therapy graduates and promotes continued interest in, communication with, and support of physical therapy

Chisholm, Rex L.

94

Northwestern researchers discover 'two-faced' cells in colon cancer  

Cancer.gov

Northwestern Medicine researchers have discovered a "two-faced" group of cells at work in human colon cancer, with opposing functions that can suppress or promote tumor growth. These cells are a subset of T-regulatory (Treg) cells, known to suppress immune responses in healthy individuals. Northwestern University is home to the Robert H. Lurie Comprehensive Cancer Center.

95

Feinberg Fact Sheet Northwestern University Feinberg School of Medicine  

E-print Network

medical school and affiliated hospitals uniformly rank highly in national surveys, based on qualityFeinberg Fact Sheet Northwestern University Feinberg School of Medicine The defining mission of Northwestern University Feinberg School of Medicine is to mentor and educate students to become exceptional

Chisholm, Rex L.

96

Feinberg Fact Sheet Northwestern University Feinberg School of Medicine  

E-print Network

school and affiliated hospitals uniformly rank highly in national surveys, based on quality of studentsFeinberg Fact Sheet Northwestern University Feinberg School of Medicine The mission of Northwestern University Feinberg School of Medicine is to mentor and educate students to become exceptional, compassionate

Chisholm, Rex L.

97

Biogeochemistry of a treeline watershed, northwestern Alaska  

USGS Publications Warehouse

Since 1950, mean annual temperatures in northwestern Alaska have increased. Change in forest floor and soil temperature or moisture could alter N mineralization rates, production of dissolved organic carbon (DOC) and organic nitrogen (DON), and their export to the aquatic ecosystem. In 1990, we began study of nutrient cycles in the 800-ha Asik watershed, located at treeline in the Noatak National Preserve, northwestern Alaska. This paper summarizes relationships between topographic aspect, soil temperature and moisture, inorganic and organic N pools, C pools, CO2 efflux, growing season net N mineralization rates, and stream water chemistry. Forest floor (O2) C/N ratios, C pools, temperature, and moisture were greater on south aspects. More rapid melt of the soil active layer (zone of annual freeze-thaw) and permafrost accounted for the higher moisture. The O2 C and N content were correlated with moisture, inorganic N pools, CO2 efflux, and inversely with temperature. Inorganic N pools were correlated with temperature and CO2 efflux. Net N mineralization rates were positive in early summer, and correlated with O2 moisture, temperature, and C and N pools. Net nitrification rates were inversely correlated with moisture, total C and N. The CO2 efflux increased with temperature and moisture, and was greater on south aspects. Stream ion concentrations declined and DOC increased with discharge. Stream inorganic nitrogen (DIN) output exceeded input by 70%. Alpine stream water nitrate (NO-3) and DOC concentrations indicated substantial contributions to the watershed DIN and DOC budgets.

Stottlemyer, R.

2001-01-01

98

Seismicity and seismotectonics of northwestern Libya  

NASA Astrophysics Data System (ADS)

As a result of the relative motion of the African and European plates, Libya has experienced a considerable intraplate tectonism particularly at its northern regions. In this study we investigate the seismic activity and the seismotectonics of northwestern Libya. The northwestern part of Libya has experienced a number of earthquakes including earthquakes of magnitude greater than six. The seismic activity shows three major seismic trends. The first trend is a NW-SE trending cluster of seismicity coinciding with the eastern boarder of the Hun Graben. A second trend is also a NW-SE direction in the offshore area northern of the city of Misuratah. The third cluster was located in the western Gulf of Sirt. The rest of seismicity is diffuse either offshore or in land, with no good correlation with well-mapped faults. Fault plane solution was estimated for 17 earthquakes recorded by the Libyan National Seismograph Network. Fault plain solution for the first area suggests oblique reverse to strike slip faulting with dominant compressional P-axes trending NW-SE and NE-SW. The second area suggests strike-slip to reverse faulting with dominant compressional P-axes trending NW-SE and NE-SW. Fault plain solution for 3 earthquakes located southern Tripoli suggests an oblique normal faulting with dominant compressional P-axes trending E-W to NE-SW. Further west to the Tunisian boarder, fault plain solution suggests oblique normal faulting with dominant compressional P-axes trending NW-SE.

Ben Suleman, Abdunnur; Elmeladi, Abdalla

2014-05-01

99

Origin and microfossils of the oil shale of the Green River Formation of Colorado and Utah  

Microsoft Academic Search

The Green River formation of Colorado and Utah is a series of lakebeds of middle Eocene age that occupy two broad, shallow, simple, structural basins, the Piceance Creek basin in northwestern Colorado and the Uinta basin in northwestern Utah. The ancient lakes apparently were shallow and had a large area, compared with depth. The abundance of organisms and the decaying

1931-01-01

100

Institute for Policy Research: Northwestern University  

NSDL National Science Digital Library

Founded in 1968, the Institute for Policy Research (IPR) at Northwestern University is an interdisciplinary public policy research institute that supports dozens of research projects dealing with a range of issues, including poverty, race, adolescent studies, philanthropy, and community development. The site will be invaluable to persons interested in these fields (especially those interested in the Midwest and Chicago), as complete information is offered about ongoing research programs, affiliated centers (such as the Joint Center for Poverty Research), and a list of staff members and faculty associates. As with many policy research institutes, the publications section contains the most important substantive material, as users may browse working papers, policy briefs, newsletters, and publications from affiliated centers. The IPR Working Paper series extends back until 1995, and contains over 100 reports in total.

101

The variation of morphological features and mineralogical components of biological soil crusts in the Gurbantunggut Desert of Northwestern China  

Microsoft Academic Search

Increasingly complex life forms were found in older biological soil crusts in the Gurbantaunggut Desert in Northwestern China.\\u000a These crusts may play a critical role in mineral erosion and desert soil formation by modifying the weathering environment\\u000a and ultimately affecting mineralogical variance. To test this hypothesis, variations in the morphological features and mineralogical\\u000a components of successional biological soil crusts at

Rongyi Chen; Yuanming Zhang; Yuan Li; Wenshou Wei; Jing Zhang; Nan Wu

2009-01-01

102

Research Scholarship, Collaboration, and Outreach at Northwestern University SPRING 2014  

E-print Network

pipeline Northwestern has created to bridge the gaps in drug discovery between laboratory concepts that colonize ocean-dwelling squid, reading the history of humans from fossils 55 million years old, attacking

Shahriar, Selim

103

Northwestern University Program in Public Health (PPH) Course Syllabus  

E-print Network

William E. Funk, PhD Peter Orris, MD, MPH Assistant Professor Adjunct Professor Preventive Medicine Preventive Medicine Feinberg School of medicine Feinberg School of Medicine Northwestern University Professor Method Development and Applications Branch Preventive Medicine US Environmental Protection Agency

Contractor, Anis

104

53rd Annual www.law.northwestern.edu/cci  

E-print Network

and demand for specialized disclosures �Impact of new guidance regarding proxy voting by advisory firms of Law and Project Co-Director, Center on Wrongful Convictions of Youth, Bluhm Legal Clinic, Northwestern

Staum, Jeremy

105

FACING SOUTH OF LANDSCAPING IN NORTHWESTERN PORTION OF PARK ...  

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

FACING SOUTH OF LANDSCAPING IN NORTHWESTERN PORTION OF PARK - Candler Park Historic District, Roughly bounded by Moreland, Dekalb, McLendon & Harold Avenues, Matthews Street & Clifton Terrace, Atlanta, Fulton County, GA

106

Facies analysis of the lower cycles of the Mesaverde Group (Upper Cretaceous) in northwestern Colorado  

USGS Publications Warehouse

The uppermost 180 m of the Mancos Shale and overlying 390 m of the Iles Formation of the Mesaverde Group in northwestern Colorado were deposited at the west margin of an epicontinental seaway that spanned North America 66-98 million years ago from the circumboreal seaway on the north to the Gulf of Mexico on the south. Sedimentation in the seaway was controlled by uplift in source areas to the west, subsidence in the basin, and eustatic sea level changes. Sedimentation rates were relatively high, averaging about 220m/million years; marine cycles of deposition occurred in northwestern Colorado that correspond to the Claggett, Judith River, and Bearpaw regressions of Montana. The upper Mancos shale and lower Iles Formation can be subdivided into ten facies based on five criteria: (1) Lithology, texture, and thickness relations (geometry); (2) sedimentary structures and contacts; (3) trace and body fossils; (4) paleocurrent data; and (5) adjoining facies (underlying, overlying, and laterally). Each facies has distinct attributes which characterize a specific depositional environment. Environments represented by facies include (A) offshore shoreface transition (prodelta); (B) shallow marine sand bars; (C) destructional delta front; (D) constructional delta front (sheet sands and mouth bars); (E) beach foreshore-shoreface deposits; (F) interdistributary marsh and swamp deposits and fluvial floodplain; (G) distributary channels; (H) crevasse splays; (J) fluvial streams; and (K) tidally influenced distributary channel. Facies analysis of outcrop data shows that transgressions and regressions occurred, some of which are related to major (eustatic) sea level changes and others that reflect only local causes. These events in northwestern Colorado are summarized in following chapters, and an attempt is made to show their relationship to broad regional patterns of sedimentation.

Kiteley, L.W.

1983-01-01

107

MISR Images Wildfires in Northwestern US  

NASA Technical Reports Server (NTRS)

MISR image of smoke plumes from devastating wildfires in the northwestern US. This view of the Clearwater and Salmon River Mountains in Idaho was acquired on August 5, 2000 (Terra orbit 3370). The body of water to the left of image center is the Cascade Reservoir, located about 100 km north of Boise and 80 km east of the Snake River. North is at the top, and the image is approximately 380 km across.

In addition to the huge plumes traversing the mountains in the northern part of the image, smoke accumulating in the lower elevation canyons and plains is visible. This image was generated using data from the MISR camera that looks forward at a steep angle (70.5 degrees). The smoke is far more visible when viewed at this highly oblique angle than it would be in a conventional, straight-downward view. In creating this color composite, data from the blue and green MISR bands, acquired at 1.1-km spatial resolution, were digitally 'sharpened' using 275-m resolution data acquired in the red band.

MISR was built and is managed by NASA's Jet Propulsion Laboratory, Pasadena, CA, for NASA's Office of Earth Science, Washington, DC. The Terra satellite is managed by NASA's Goddard Space Flight Center, Greenbelt, MD. JPL is a division of the California Institute of Technology.

For more information: http://www-misr.jpl.nasa.gov

2000-01-01

108

Northwestern Tharsis Latent Outflow Activity Mars  

NASA Technical Reports Server (NTRS)

Previously defined outflow channels, which are indicated by relict landforms similar to those observed on Earth, signify ancient catastrophic flood events on Mars. These conspicuous geomorphic features are some of the most remarkable yet profound discoveries made by geologists to date. These outflow channels, which debouched tremendous volumes of water into topographic lows such as Chryse, Utopia, Elysium, and Hellas Planitiae, may represent the beginning of warmer and wetter climatic periods unlike the present-day cold and dry Mars. In addition to the previously identified outflow channels, observations permitted by the newly acquired Mars Orbiter Laser Altimeter (MOLA) data have revealed a system of gigantic valleys, referred to as the northwestern slope valleys (NSV), that are located to the northwest of a huge shield volcano, Arsia Mons, western hemisphere of Mars. These features generally correspond spatially to gravity lows similar to the easternmost, circum-Chryse outflow channel systems. Geologic investigations of the Tharsis region suggest that the large valley system pre-dates the construction of Arsia Mons and its extensive associated lava flows of mainly Late Hesperian and Amazonian age and coincides stratigraphically with the early development of the circum-Chryse outflow channel systems that debouch into Chryse Planitia. This newly identified system, the NSV, potentially signifies the largest flood event(s) ever recorded for the solar system. Additional information is contained in original extended abstract.

Dohm, J. M.; Anderson, R. C.; Baker, V. R.; Ferris, J. C.; Hare, T. M.; Strom, R. G.; Rudd, L.; Rice, J. W., Jr.; Scott, D. H.

2000-01-01

109

Meso-scale drivers of forest structure and function in northwestern Amazonia  

NASA Astrophysics Data System (ADS)

Continent-scale studies of Amazonia have found patterns in forest structure and function corresponding to broad-scale patterns in soil properties. Little information exists at finer scales, however, about how patterns in forest structure, biomass, and canopy chemistry are distributed across Amazonian landscapes, and the underlying drivers of these patterns. Here we used airborne LiDAR and imaging spectroscopy to measure variations in forest structure, biomass, and canopy reflectance for more than 600 km2 of forest in northwestern Amazonia. We combined these data with information on plant species composition and soil properties for 78 sites distributed evenly between two underlying geological formations. We found that soil properties and plant species composition individually explained 70-80% of the variation in biomass in these forests. We further found that these variations in soils and species composition corresponded to profound changes in forest vertical structure. We last found that soil variables and plant species composition explained more than 90% of the variation in canopy chemistry as measured by imaging spectroscopy, resulting in distinct patterns in canopy reflectance. We conclude that soil properties and plant species composition are the dominant drivers of structural and functional patterns in northwestern Amazonian forests over scales of 10s to 100s of kilometers, and that these patterns correspond to underlying geological formations. At broader scales, we anticipate that soil properties and underlying geology provide a scaffold for forest structure and function upon which variations due to climate or distance are superimposed.

Higgins, M.; Asner, G. P.; Anderson, C.; Martin, R.; Knapp, D. E.; Perez, E.; Elespuru, N.; Alonso, A.

2013-12-01

110

Slope sedimentation associated with a vertically building shelf, Bone Spring Formation, Mescalero Escarpe Field, southeast New Mexico  

Microsoft Academic Search

Mescalero Escarpe field contains slope strata in the Bone Spring formation which provide insight into development of the Northwestern shelf to the north and the Delaware basin to the south. During the Leonardian (Permian), the Northwestern shelf grew vertically due to regional subsidence and cyclic sedimentation. Slope facies include (1) dolomitized peloid-bioclast packstone, (2) dolomite megabreccia, (3) laminated dolomitic mudstone,

A. H. Saller; J. W. Barton; R. E. Barton

1987-01-01

111

Southwest Monsoon Circulation and Environments of Recent Planktonic Foraminifera in the Northwestern Arabian Sea  

NASA Astrophysics Data System (ADS)

Digital hydrographic data combined with satellite thermal infrared and visible band remote sensing provide a synoptic climatological view of the shallow planktonic environment. This paper uses wind, hydrographic, and ocean remote sensing data to examine southwest monsoon controls on the foraminiferal faunal composition of Recent seafloor sediments of the northwestern Arabian Sea. Ekman pumping resulting in open-ocean upwelling and coastal upwelling create two distinctly different mixed layer plankton environments in the northwestern Arabian Sea during the summer monsoon. Open-sea upwelling to the northwest of the mean July position of the Findlater Jet axis yields a mixed layer environment with temperatures of less than 25°C to about 26.5°C, phytoplankton pigment concentrations between 1.5 and 5.0 mg/m³, and mixed layer depths less than 50 m. Convergence in the Ekman layer in the central Arabian Sea drives the formation of a mixed layer that is greater than 50 m thick, warmer than about 26.5°C, and has phytoplankton pigment concentrations generally below 2.0 mg/m³. Coastal upwelling creates an extremely eutrophic plankton environment that persists over and immediately adjacent to the Omani shelf and undergoes significant offshore transport only within topographically induced coastal squirts. The foraminiferal faunal composition of upper Pleistocene deep-sea sediments of the northwestern Arabian Sea are mainly controlled by vertical nutrient fluxes caused by Ekman pumping, not coastal upwelling. Transfer functions for late Pleistocene mixed layer depth, temperature, and chlorophyll have been obtained through factor analysis and nonlinear multiple regression between late summer mixed layer environment and Recent sediment faunal observations.

Brock, John C.; McClain, Charles R.; Anderson, David M.; Prell, Warren L.; Hay, William W.

1992-12-01

112

Middle Proterozoic compressional orogen in northwestern Canada  

NASA Astrophysics Data System (ADS)

Evidence from seismic reflection profiling, drill holes, potential field measurements and regional geology shows that an east verging Proterozoic thin-skinned thrust and fold belt is situated beneath the Interior Platform of northwestern Canada. Balanced cross sections and associated palinspastic reconstructions provide constraints on the extent of the shortening in the thrust belt and suggest that at least 50-90 km of compression can be accounted for. Although the Proterozoic stratigraphy in the subsurface is not well known, the cross sections are constrained essentially by seismic reflection geometry. Shortening occurred on subhorizontal detachment(s) that lie above the autochthonous (Hudsonian?) basement. Seismic reflection data from the area west of the major thin-skinned thrust structures show that the Proterozoic strata there can be traced for up to 100 km and are characterized by broad, open folds with wavelengths of 10 km or more. Uniform potential field anomalies and subhorizontal seismic reflections further indicate that there are no major crustal boundaries (such as sutures) in the area between the thrust belt and the Campbell uplift near Inuvik, Northwest Territories, that were associated with the thrusting. The detachment(s) that carried the folded and thrust faulted allochthons must therefore extend for a considerable distance to the northwest of the thrust belt. New deep crustal seismic reflection data from the Campbell uplift, however, show evidence for crustalpenetrating Proterozoic structures that dip northwestward and that were probably reactivated during late Paleozoic compression and Mesozoic extension. Taken together, the various data thus indicate that the area from Great Bear Lake to the Campbell uplift (about 400 km) is underlain by a mid-Proterozoic decollement above which the compressional deformation took place, and that the deformation extended to the north side of the present Campbell uplift where steeply north dipping structures indicate that the underlying autochthonous basement is characterized by a ramp structure that was probably associated with the southern edge of a Proterozoic basin.

Cook, Frederick A.

1988-08-01

113

Jurassic platform development, northwestern Gulf of Mexico  

SciTech Connect

Triassic and Early Jurassic rifting set the stage for the subsequent development of carbonate platforms in the Late Jurassic. These platforms formed along the interior margins of salt basins separated from the main ancestral Gulf of Mexico by a series of positive features. A major sea level rise, after deposition of the Louann Salt (late Callovian), drowned the interior salt basins around the margins of the Gulf of Mexico, leading to an anoxic event. Organic-rich sediments of the lower Smackover were deposited as a basin-fill sequence, forming one of the major hydrocarbon source rocks of the region. As sea level rise slowed in the late Oxfordian, carbonate production began to catch up with sea level rise along the basin margins, leading to the initial development of a rimmed carbonate platform. The platform margin was marked by high-energy ooid grainstones, while crustacean pellet muds were deposited in the platform interior. A high-energy ooid-dominated platform (upper Smackover) developed in the late Oxfordian when sea level reached a standstill. During the subsequent Kimmeridgian sea level rise, a second rimmed carbonate platform, the Haynesville, was developed. During the initial rise, grainstones were deposited on the platform margin, while the interior was dominated by evaporites (Buckner) and siliciclastics. As sea level slowed and reached a standstill, the platform margin facies extended shoreward (Gilmer) and a high-energy platform, analogous to the upper Smackover, was formed. The Smackover and Haynesville platforms of the northwestern gulf show a parallel evolution in response to cyclic changes in Upper Jurassic sea level.

Moore, C.H. Jr.

1987-05-01

114

TRANSPORTATION CENTER--NORTHWESTERN UNIVERSITY Aviation Symposium: The Future for Aviation  

E-print Network

TRANSPORTATION CENTER--NORTHWESTERN UNIVERSITY Aviation Symposium: The Future for Aviation April The Transportation Center has organized a special Aviation Symposium focusing on important aviation industry topics, Professor of Transportation at Northwestern University and former Director of the Transportation Center

Bustamante, Fabián E.

115

76 FR 77779 - Availability of Seats for the Northwestern Hawaiian Islands Coral Reef Ecosystem Reserve Advisory...  

Federal Register 2010, 2011, 2012, 2013

...Seats for the Northwestern Hawaiian Islands Coral Reef Ecosystem Reserve Advisory Council...seats on the Northwestern Hawaiian Islands Coral Reef Ecosystem Reserve Advisory Council...SUPPLEMENTARY INFORMATION: The NWHI Coral Reef Ecosystem Reserve is a [[Page...

2011-12-14

116

77 FR 16211 - Availability of Seats for the Northwestern Hawaiian Islands Coral Reef Ecosystem Reserve Advisory...  

Federal Register 2010, 2011, 2012, 2013

...Seats for the Northwestern Hawaiian Islands Coral Reef Ecosystem Reserve Advisory Council...seats on the Northwestern Hawaiian Islands Coral Reef Ecosystem Reserve Advisory Council...SUPPLEMENTARY INFORMATION: The NWHI Coral Reef Ecosystem Reserve is a marine...

2012-03-20

117

Page 1 of 3 Northwestern University Guidelines Regarding Boundaries with Minors  

E-print Network

's "Reporting Suspected Child Abuse and Neglect" policy (http://policies.northwestern.edu/docs/Reporting_Child_Abuse may be abused or neglected, immediately follow all steps set forth in Northwestern University

Shahriar, Selim

118

GPS Investigation of Active Faults in Northwestern Oregon  

NASA Astrophysics Data System (ADS)

Geologic studies indicate that northwestern Oregon contains a system of faults, notably the Portland Hills Fault and Gales Creek Fault, though uncertainty exists regarding their rates of motion. On the larger scale of the northwestern United States, previous work has indicated relative motions as crustal block rotations whose axes of rotation generally fall near the Oregon-Washington-Idaho border and the Idaho Batholith, with regional slip rates predicted across the Portland area of a few mm/yr. We are gathering additional Global Positioning System (GPS) measurements throughout northwestern Oregon to learn about the pattern of deformation and to estimate slip rates of faults in the region. We will present interpretations of the active tectonics of the system based upon these measurements.

Lancaster, M. N.; McCaffrey, R.; King, R. W.

2011-12-01

119

Incidence of narcotic abuse during pregnancy in northwestern Ontario  

PubMed Central

Abstract Objective To document the incidence and outcomes of narcotic use during pregnancy in northwestern Ontario. Design Three-year prospective cohort study. Setting Sioux Lookout and surrounding communities in northwestern Ontario. Participants A total of 1206 consecutive births in a catchment area of 28 000 First Nations patients. Main outcome measures Incidence of narcotic use, and maternal and neonatal outcomes. Results Incidence of narcotic use in pregnancy has risen to 28.6% (P < .001) and incidence of neonatal abstinence syndrome has fallen to 18.0% of narcotic-exposed births (P = .003). Daily intravenous drug use is now a common pattern of abuse. Conclusion Narcotic abuse in pregnancy has dramatically increased in northwestern Ontario. Neonatal outcomes have improved as a result of a family medicine–based prenatal and obstetric program that includes a narcotic replacement and tapering program. PMID:25316764

Kelly, Len; Guilfoyle, John; Dooley, Joe; Antone, Irwin; Gerber-Finn, Lianne; Dooley, Roisin; Brunton, Nicole; Kakegamuck, Kara; Muileboom, Jill; Hopman, Wilma; Cromarty, Helen; Linkewich, Barb; Maki, Jennifer

2014-01-01

120

Alaska Park Science, Volume 8, Issue 2 Recent Notable Floristic Records from Northwestern Alaska  

E-print Network

33 Alaska Park Science, Volume 8, Issue 2 Recent Notable Floristic Records from Northwestern Alaska By Carolyn Parker and Steffi Ickert-Bond Abstract Botanical surveys in northwesternAlaska, including Alaska have been documented for sev- eral rare species that link northwestern Alaska with the circumpolar

Ickert-Bond, Steffi

121

Simulations of Hydrographic Properties in the Northwestern North Atlantic Ocean in Coupled Climate Models  

E-print Network

Simulations of Hydrographic Properties in the Northwestern North Atlantic Ocean in Coupled Climate of the northwestern North Atlantic Ocean, in particular the Labrador and Irminger Seas, has been assessed. This area currents, which play an important role in the northwestern North Atlantic Ocean, cannot be resolved

Drijfhout, Sybren

122

2010 Murphy Society Student Funded Projects: MBECC 2011 Northwestern University Biomedical Engineering Society Student Chapter  

E-print Network

, building, and racing a solar powered vehicle and by expanding public knowledge and interest in alternative programs at local schools and town beautification activities. Northwestern Solar Car Team Rebecca Puttkammer, Treasurer, Northwestern Solar Car Team The mission statement of the Northwestern Solar Car Team

MacIver, Malcolm A.

123

Northwestern researchers develop new way to treat lymphoma without chemotherapy  

Cancer.gov

A new study by Northwestern Medicine researchers shows that synthetic HDL nanoparticles killed B-cell lymphoma, the most common form of the disease, in cultured human cells, and inhibited human B-cell lymphoma tumor growth in mice. The nanoparticle appears to the cancerous lymphoma cell like a preferred meal -- natural HDL. But when the particle engages the cell, it actually plugs it up and blocks cholesterol from entering. Deprived of an essential nutrient, the cell eventually dies. Northwestern is home to the Robert H. Lurie Comprehensive Cancer Center.

124

How does the Amur River discharge flow over the northwestern continental shelf in the Sea of Okhotsk?  

NASA Astrophysics Data System (ADS)

The paths of the Amur River discharge on the continental shelf in the Sea of Okhotsk are still unknown despite their significance in transporting dissolved and particulate iron. In this study, we conduct a coupled ice-ocean simulation for the northern Sea of Okhotsk from June 1998 to September 2000 to answer the question: Does the Amur River discharge deposit materials to the pathway of the dense shelf water? In a series of numerical experiments, we identified two routes (the western and eastern routes) that could transport the river water more than 100 km offshore over the northwestern continental shelf. The two routes share the clockwise gyre in the Sakhalin Gulf and the northeastward flow on the northwestern continental shelf. These features are connected through the westward jet along the slope from the Sakhalin Gulf (the western route) and the northward transport over the shelf break canyon (the eastern route). The river water, the dense shelf water, and the easterly wind are in a fine geophysical balance for those features, and all are required for the formation of the two routes. The model results show that these unique joint effects in the Sea of Okhotsk allow the Amur River discharge to be effectively transported over the northwestern continental shelf, unlike a general river discharge that flows along the coast, and deposit materials into the pathway of the dense shelf water.

Fujisaki, Ayumi; Mitsudera, Humio; Wang, Jia; Wakatsuchi, Masaaki

2014-08-01

125

2012WEEKLY BULLETIN DEPARTMENT OF CHEMISTRY, NORTHWESTERN UNIVERSITY  

E-print Network

-3113 February 4, 2013 CALENDAR FOR THE COMING WEEKS Tuesday, Februrary 5, 2013 Faculty Lunch Seminar Professor with the FDA. Upcoming Events For other upcoming events, please visit http://www.chemistry.northwestern.edu/events/calendar.html. Opportunities Southern Teachers Agency has quite a few chemistry and physical science job listings from schools

Grzybowski, Bartosz A.

126

Grimmia brittoniae, a rare moss endemic to northwestern Montana  

Microsoft Academic Search

The rare moss Grimmia brittoniae Williams Mas recently rediscovered at its type locality and discovered at two additional locations, bringing the total number of known locations to four. This distinct moss is restricted to calcareous rock outcrops at low elevations in northwestern Montana, including areas threatened by past and present development. VA:IBN

H. C. Greven; T. Spribille

1999-01-01

127

The Center for Talent Development at Northwestern University  

ERIC Educational Resources Information Center

During the summer and on weekends, it is not unusual to see many children, the youngest holding their parents' hands, walking to classes amongst the beautiful landscaping and old buildings of Northwestern University on Lake Michigan's shores in Evanston, Illinois. The Center for Talent Development (CTD) has been offering services and programs to…

Olszewski-Kubilius, Paula

2004-01-01

128

Technology-Driven, Highly-Scalable Dragonfly Topology Northwestern University  

E-print Network

Technology-Driven, Highly-Scalable Dragonfly Topology John Kim Northwestern University Evanston, IL an efficient network. In this paper, we introduce the dragonfly topology which uses a group of high minimally routed packet traverses at most one global channel. By reducing global channels, a dragonfly

Tomkins, Andrew

129

Northwestern University Information Technology Your data. Your privacy. Your role.  

E-print Network

adverse publicity, and bolsters the reputation of the University » » » » » » » » » » » #12;SECURE YOURNorthwestern University Information Technology GET SECURE Your data. Your privacy. Your role. #12;Northwestern provides the University community with a robust network and access to a diverse array

Shahriar, Selim

130

Beak deformities in Northwestern Crows: evidence of a multispecies epizootic  

USGS Publications Warehouse

Beak abnormalities are rare among adult birds and, typically, are not widespread in a given population, within a region, or across multiple species. A high concentration of beak deformities was recently documented in Black-capped Chickadees (Poecile atricapillus) and other resident avian species in Alaska. We describe a parallel condition in Northwestern Crows (Corvus caurinus) that signals the emergence of a multispecies epizootic. On the basis of 186 Northwestern Crows captured at six sites in Alaska during 2007 and 2008, we estimated the prevalence of beak deformities in adults to be 16.9 ± 5.3%, the highest rate of gross deformities ever recorded in a wild bird population. Prevalence varied among sites and was as high as 36% on the Kenai Peninsula, which suggests possible epizootic clusters. We also documented beak abnormalities in an additional 148 Northwestern Crows in south-central and southeastern Alaska and in 64 crows near Vancouver, British Columbia, and Puget Sound, Washington, a region where both Northwestern Crows and American Crows (C. brachyrhynchos) occur. The increase in frequency and distribution of crows observed with abnormal beaks throughout the Pacific Northwest since the late 1990s indicates a geographic expansion of this problem. Affected crows exhibited elongated and often crossed beaks that were morphologically similar to deformities documented in Black-capped Chickadees and other species in Alaska over approximately the same period. Additional research is needed to determine the etiology and potential adverse effects on bird populations affected by this disorder.

Van Hemert, Caroline; Handel, Colleen M.

2010-01-01

131

2014 WEEKLY BULLETIN DEPARTMENT OF CHEMISTRY, NORTHWESTERN UNIVERSITY  

E-print Network

.D. is required, preferably in an area of chemistry with an interest in applications to Forensic Chemistry/ biochemistry/ pharmacy, and forensic chemistry programs. WIU is a comprehensive public university offering 572014 WEEKLY BULLETIN DEPARTMENT OF CHEMISTRY, NORTHWESTERN UNIVERSITY EVANSTON, ILLINOIS April 21

Grzybowski, Bartosz A.

132

Late Holocene environments at Lake Mitsinjo, northwestern Madagascar  

Microsoft Academic Search

Two sediment cores from Lake Mitsinjo in northwestern Madagascar were analysed for evidence of past environmental changes. The unconformities in a 503 cm core from the centre of the lake and a 306 cm core from the shore were correlated to identify a hiatus in sedimentation that occurred just before ca. 1000 BP. The 3500-year stratigraphic record was analysed for

Katsumi Matsumotot; David A. Burneyt

1994-01-01

133

Internship Search Survey 2009 Northwestern University Career Services  

E-print Network

Internship Search Survey 2009 Northwestern University Career Services Collected from Student of 2012 91 Class of 2009 46 Class of 2013 2 The Internship Search Approximately, to how many internships did you apply? (N=516) 1-5 Internships 234 45.35% 6-10 Internships 96 18.6% When did you start your

Shull, Kenneth R.

134

LOOSELY COLONIAL NESTING BY WESTERN KINGBIRDS IN NORTHWESTERN TEXAS  

Microsoft Academic Search

The number of Western Kingbirds (Tyrannus verticalis) breeding on a farmstead in northwestern Texas increased from four pairs in 1990 to 13 pairs in 2001. In most cases, nests were located in large planted shade trees at this 0.6-ha farmstead. The earliest resident birds arrived on the mean date of 20 April (n = 12 years), and earliest observed nest

CARROLL D. LrFFLEFIELD

2004-01-01

135

Striving for Social Status NICOLE IMMORLICA, Northwestern University  

E-print Network

University GREG STODDARD, Northwestern University Social comparisons can influence individual decisions on how the status considerations and network structure influences individual outcomes and aggregate of this game form a non-empty complete lattice. Furthermore, sequential best-response dynamics from ei- ther

Fiat, Amos

136

Northwestern University Career Services Twitter Tutorial What is Twitter?  

E-print Network

Northwestern University Career Services Twitter Tutorial What is Twitter? Twitter is an online?" in 140 characters or less ­ also known as a "Tweet." Why Use Twitter? Twitter allows you to follow anyone, and Twitter provides you with a live news feed of Tweets from your followers. Thus, you get constant news

Shull, Kenneth R.

137

Natural gases in mercury deposits of Donbass and Northwestern Caucasus  

SciTech Connect

A short review of information on the composition and genesis of natural gases in the Northwestern Caucasus and Donbass mercury deposits is presented. These differences in gas composition, as well as the distinct predominance of carbon dioxide and hydrogen in hydrothermally altered rocks, may be used for predicting gas-bearing capacity of deposits and for mercury prospecting in new areas. (JMT)

Fridman, A.I.; Makhlova, N.K.; Plotnikov, I.A.

1981-02-01

138

Novel poxvirus in big brown bats, northwestern United States.  

PubMed

A wildlife hospital and rehabilitation center in northwestern United States received several big brown bats with necrosuppurative osteomyelitis in multiple joints. Wing and joint tissues were positive by PCR for poxvirus. Thin-section electron microscopy showed poxvirus particles within A-type inclusions. Phylogenetic comparison supports establishment of a new genus of Poxviridae. PMID:23735421

Emerson, Ginny L; Nordhausen, Robert; Garner, Michael M; Huckabee, John R; Johnson, Steven; Wohrle, Ron D; Davidson, Whitni B; Wilkins, Kimberly; Li, Yu; Doty, Jeffrey B; Gallardo-Romero, Nadia F; Metcalfe, Maureen G; Karem, Kevin L; Damon, Inger K; Carroll, Darin S

2013-06-01

139

Novel Poxvirus in Big Brown Bats, Northwestern United States  

PubMed Central

A wildlife hospital and rehabilitation center in northwestern United States received several big brown bats with necrosuppurative osteomyelitis in multiple joints. Wing and joint tissues were positive by PCR for poxvirus. Thin-section electron microscopy showed poxvirus particles within A-type inclusions. Phylogenetic comparison supports establishment of a new genus of Poxviridae. PMID:23735421

Nordhausen, Robert; Garner, Michael M.; Huckabee, John R.; Johnson, Steven; Wohrle, Ron D.; Davidson, Whitni B.; Wilkins, Kimberly; Li, Yu; Doty, Jeffrey B.; Gallardo-Romero, Nadia F.; Metcalfe, Maureen G.; Karem, Kevin L.; Damon, Inger K.; Carroll, Darin S.

2013-01-01

140

Seabird Research and Monitoring Needs in Northwestern México1  

Microsoft Academic Search

Seabird research in northwestern México has increased in the last 20 years, however many areas remain unexplored and seabird colony inventories are badly needed. Coastal wetlands and adjacent islands from southern Sonora through Nayarit host large colonies of pelecaniforme and other seabirds, but surveys of these areas have been limited and localized. Seabird colonies on islands in the Gulf of

Eduardo Palacios; Lucía Alfaro

2005-01-01

141

SKIN CANCER INSTITUTE THE CANCER INSTITUTES AT NORTHWESTERN MEDICINE  

E-print Network

SKIN CANCER INSTITUTE THE CANCER INSTITUTES AT NORTHWESTERN MEDICINE Melanoma The Most Lethal Form advances in nanotechnology to increase our understanding of melanoma and to develop new tools into controllable cells or target them for destruction. Investigators also are using nanotechnology to understand

Engman, David M.

142

BIOMEDICAL RESEARCH BIOMEDICAL RESEARCH BUILDING AT NORTHWESTERN MEDICINE  

E-print Network

benches for our scientists. Floors will house senior principal investigators, technicians, laboratory Research building and the Robert H. Lurie Medical Research Center. #12;Research Laboratory $1.5 million for wet laboratory space and propel Northwestern Medicine's biomedical enterprise in new and exciting

Engman, David M.

143

Emergence of African Swine Fever Virus, Northwestern Iran  

PubMed Central

In 2008, African swine fever was introduced into Georgia, after which it spread to neighboring Armenia, Azerbaijan, and the Russian Federation. That same year, PCR and sequence analysis identified African swine fever virus in samples from 3 dead female wild boars in northwestern Iran. Wild boars may serve as a reservoir. PMID:21122227

Rahimi, Pooneh; Sohrabi, Amir; Ashrafihelan, Javad; Edalat, Rosita; Alamdari, Mehran; Masoudi, Mohammadhossein; Mostofi, Saied

2010-01-01

144

October 34, 2013 | Chicago www.law.northwestern.edu/professionaled  

E-print Network

.m. | Labor and Employment Law: Recent Developments ·EEOC­cyberbullying,backgroundchecks,and leavesofabsencesOctober 3­4, 2013 | Chicago www.law.northwestern.edu/professionaled Designed by and focused School of Law, Chicago Nicholas L. Giampietro, Institute Chair, Executive Vice President, Chief Legal

Shahriar, Selim

145

Basement structure of the north-western Yermak Plateau  

Microsoft Academic Search

The separation of Northeast Greenland and Svalbard was achieved by large strike slip movements in Cenozoic times. Evidence for these movements can be found onshore both on North Greenland and Svalbard. However, the role of the Yermak Plateau in this process is quite speculative. New multichannel seismic (10 km spacing) and aeromagnetic data (7.5 km spacing) across the north-western part

W. Jokat; W. Geissler; M. Voss

2008-01-01

146

Reproductive biology of Black Anglerfish (Lophius budegassa) in the northwestern  

E-print Network

, a demersal fish distributed along the Mediterranean Sea, as well as the northeastern Atlantic from390 Reproductive biology of Black Anglerfish (Lophius budegassa) in the northwestern Mediterranean Mediterranean Sea. Ovaries and testes presented traits common among fishes of the order Lophi- iformes. Spawning

147

New England: 1. Sea scallop -Northwestern Atlantic Coast (2001)  

E-print Network

New England: 1. Sea scallop - Northwestern Atlantic Coast (2001) 2. Silver Hake ­ Gulf of Maine - Southern New England / Mid-Atlantic (2012) 10. Yellowtail flounder - Southern New England / Mid Office of Sustainable Fisheries New England/ Mid-Atlantic 1. Goosefish (Monkfish) - Gulf of Maine

148

New England: 1. Sea scallop -Northwestern Atlantic Coast (2001)  

E-print Network

New England: 1. Sea scallop - Northwestern Atlantic Coast (2001) 2. Silver Hake ­ Gulf of Maine - Southern New England / Mid-Atlantic (2012) 10. Yellowtail flounder - Southern New England / Mid Fisheries New England/ Mid-Atlantic 1. Goosefish (Monkfish) - Gulf of Maine / Northern Georges Bank (2008) 2

149

New England: 1. Sea scallop -Northwestern Atlantic Coast (2001)  

E-print Network

New England: 1. Sea scallop - Northwestern Atlantic Coast (2001) 2. Silver Hake ­ Gulf of Maine - Southern New England / Mid-Atlantic (2012) 10. Yellowtail flounder - Southern New England / Mid and Atmospheric Administration National Marine Fisheries Service Office of Sustainable Fisheries New England/ Mid

150

Epiphyte communities on redwood (Sequoia sempervirens) in northwestern California  

Microsoft Academic Search

We used rope techniques to access epiphyte communities on nine large and structurally complex redwoods (Sequoia sempervirens) occupying old-growth forest reserves of northwestern California. All species of epiphytic lichens, bryophytes and vascular plants were recorded, biomass of dominant vascular epiphytes (Polypodium scouleri and Vaccinium ovatum) was quantified, and tree crowns were mapped to estimate substrate surface areas. We employed a

Cameron B. Williams; Stephen C. Sillett

2007-01-01

151

Summer Research Experience for Undergraduates at Northwestern The Materials Research Science and Engineering Center (MRSEC) at Northwestern  

E-print Network

Science and Engineering Center (MRSEC) at Northwestern University offers a 9-week, paid summer research in science and engineering fields. Research areas include ceramics, polymers, nanocomposites, photonics an undergraduate degree in science or engineering who are US citizens or permanent residents are eligible

Levine, Alex J.

152

Effect of the Spanish Conquest on coastal change in Northwestern Peru.  

PubMed

When Francisco Pizarro and his small band of Spanish conquistadores landed in northern Peru in A.D. 1532 to begin their conquest of the vast Inca Empire, they initiated profound changes in the culture, language, technology, economics, and demography of western South America. They also altered anthropogenically modulated processes of shoreline change that had functioned for millennia. Beginning with the extirpation of local cultures as a result of the Spanish Conquest, and continuing through today, the intersection of demography, economy, and El Niño-driven beach-ridge formation on the Chira beach-ridge plain of Northwestern Peru has changed the nature of coastal evolution in this region. A similar event may have occurred at about 2800 calibrated y B.P. in association with increased El Niño frequency. PMID:24843118

Belknap, Daniel F; Sandweiss, Daniel H

2014-06-01

153

Generalized Geologic evaluation of side looking radar imagery of the Teton Range and Jackson Hole, northwestern Wyoming  

NASA Technical Reports Server (NTRS)

A generalized geologic evaluation of lines, localities, and features of various types that are visible on a series of radar image strips covering the Teton Range and Jackson Hole in northwestern Wyoming, is given. No attempt was made to collate a complete geologic map with the radar image at each locality. Formation names, problems of geologic interpretation, and details of stratigraphy and structure that are not directly pertinent to a study of the imagery are omitted, but reference is made to publications that contain this type of supplementary information.

Love, J. D.

1970-01-01

154

Eocene exhumation and basin development in the Puna of northwestern Argentina  

NASA Astrophysics Data System (ADS)

The Puna is part of the larger Puna-Altiplano Plateau (also known as the Central Andean Plateau), characterized by high elevation, low relief, and aridity, located in the central Andes of Bolivia and Argentina. Tertiary sedimentary rocks preserved within the Puna contain a unique archive of information regarding the paleogeography, depositional environments, and timing of sediment source exhumation during the early stages of Andean mountain building. The Eocene Geste Formation in the Salar de Pastos Grandes area (within the central Puna of northwestern Argentina) consists of deposits that are the result of confined to unconfined flows in a sandy to gravelly, braided fluvial system and alluvial fans proximal to the source terrane. Paleocurrent data document an overall eastward flow direction. Up-section coarsening of the Geste Formation suggests that topographic relief in the source area increased through time, possibly owing to enhanced tectonic activity and source terrane unroofing. Sandstone petrography and conglomerate clast-count data document quartzose and phyllitic compositions typical of Ordovician rocks preserved just west of the Salar de Pastos Grandes area. Paleocene-Eocene detrital apatite fission track age populations (P1: ˜35-52 Ma; P2: ˜52-65 Ma) of the Geste Formation and their consistent trends up-section suggest moderate to rapid (˜0.4 mm/a to >1 mm/a) exhumation of western sediment sources during the early to mid-Tertiary stages of Andean mountain building. Sedimentation rates increase up-section from ˜0.1 mm/a to 1 mm/a. Our data, when combined with other structural, stratigraphic and seismic evidence from surrounding regions, suggest that the Geste Formation was deposited in response to crustal shortening and resulting erosion and sedimentation, which started as early as Cretaceous in the Chilean Cordillera de Domeyko and in the Salar de Pastos Grandes area by Eocene time. The Geste Formation could be interpreted either as a local wedge-top accumulation on the eastward propagating central Andean orogenic wedge, or as a local intermontane basin. The similarities between wedge-top deposits preserved in Bolivia and Eocene deposits in northwestern Argentina, south of ˜25°S, lead us to favor the wedge-top scenario for the Geste Formation. If correct, this implies that the deformation front of the Andean orogenic wedge incorporated both thin- and thick-skinned structures as it migrated, possibly unsteadily, from the Cordillera de Domeyko during the Cretaceous-Paleocene to areas within the Puna and Eastern Cordillera by mid-late Eocene time. Contemporaneously, a regional-scale foreland basin system developed over an along-strike distance of at least 650 km.

Carrapa, B.; Decelles, P. G.

2008-02-01

155

Geology and timing of mineralization at the Cangshang gold deposit, north-western Jiaodong Peninsula, China  

USGS Publications Warehouse

The Cangshang gold deposit of the northwestern Jiaodong Peninsula contains reserves of greater than 50 tonnes (t) and is developed by the largest open pit gold mine in China. This deposit is a Jiaojia-style (i.e. disseminated-and-veinlet) deposit. It is controlled by the San-Cang fault zone, which trends ???040?? and dips 40-75??SE at the mine site. The main (no. 1) orebody lies between a hanging wall of Precambrian metamorphic rocks (mainly amphibolite) of the Fenzishan Group and a footwall composed of the Mesozoic Linglong granitoid. The ore zone is mainly composed of pyritized, sericitized and silicified granitoid, which has undergone variable degrees of cataclasis. SHRIMP U-Pb dating of zircon indicates that the protolith of the hanging wall amphibolite was formed at 2530 ?? 17 Ma and underwent metamorphism at 1852 ?? 37 Ma. The footwall granodiorite has been dated at 166 ?? 4 Ma, whereas zircons from the ore zone yield a younger age of 154 ?? 5 Ma. Cathodoluminescence images of zircons from the granodiorite and ore zone show oscillatory zonation indicative of an igneous origin for both and the ages of these zircons, therefore, are all interpreted to be representative of magmatic crystallization. Dating of sericite by 40Ar-39Ar has been used to directly determine the timing of formation of the Cangshang deposit, providing the first time absolute age on formation of the Jiaojia-style gold deposits. The well-defined age of 121.3 ?? 0.2 Ma provides the precise timing of gold mineralization at the Cangshang deposit. This age is consistent with those of Linglong-style (vein type) gold mineralization, also from the north-western Jiaodong Peninsula, at between 126 and 120 Ma. Therefore, our work indicates that both styles of gold deposits in the Jiaodong Peninsula were formed during the same mineralization event.

Zhang, X.; Cawood, P.A.; Wilde, S.A.; Liu, R.; Song, H.; Li, W.; Snee, L.W.

2003-01-01

156

Pit Distribution in Titan's Equatorial Region. Kimberly Adams and Donna M. Jurdy, Northwestern University, Department of Earth and Planetary Sciences, Evanston, IL 60208 (kadams@earth.northwestern.edu).  

E-print Network

Pit Distribution in Titan's Equatorial Region. Kimberly Adams and Donna M. Jurdy, Northwestern@earth.northwestern.edu). Introduction: Cassini's Radar [1,2] imaged the surface of Titan through its thick atmosphere. Using of the T8 im- age, between two mountains [4]. The pits range in size up to 2 km in diameter. Pits on Titan

Jurdy, Donna M.

157

Heat flow from eastern Panama and northwestern Colombia  

USGS Publications Warehouse

Heat flows were determined at 12 sites in four distinct areas between longitude 77?? and 80??W in eastern Panama and northwestern Colombia. Evidently, most of the region is underlain by mafic oceanic crust so that the crustal radiogenic component of heat flow is very small (??? 0.1 ??cal cm-2 sec-1). Low heat-flow values (??? 0.7 ??cal cm-2 sec-1) in northwestern Colombia may reflect thermal transients associated with shallow subduction. The normal values (??? 1) at about 78??W are consistent with the mean heat flow from the western Caribbean and the Gulf of Mexico. At 80??W, a fairly high value of 1.8 may define the easterly limit of thermal transients due to Cenozoic volcanic activity in Central America. ?? 1974.

Sass, J.H.; Munroe, R.J.; Moses, T.H., Jr.

1974-01-01

158

Geological mapping in northwestern Saudi Arabia using LANDSAT multispectral techniques  

NASA Technical Reports Server (NTRS)

Various computer enhancement and data extraction systems using LANDSAT data were assessed and used to complement a continuing geologic mapping program. Interactive digital classification techniques using both the parallel-piped and maximum-likelihood statistical approaches achieve very limited success in areas of highly dissected terrain. Computer enhanced imagery developed by color compositing stretched MSS ratio data was constructed for a test site in northwestern Saudi Arabia. Initial results indicate that several igneous and sedimentary rock types can be discriminated.

Blodget, H. W.; Brown, G. F.; Moik, J. G.

1975-01-01

159

The Heroic Age: A Journal of Early Medieval Northwestern Europe  

NSDL National Science Digital Library

Published since 1998, this free, peer-reviewed online journal is "dedicated to the study of Northwestern Europe from the Late Roman Empire to the advent of the Norman Empire." To date, four issues have been published, all of which are available online. In addition to articles, each issue contains a forum, Website and book reviews, and a digest of recent archaeological news. The main site also offers a collection of related links.

1998-01-01

160

Benthic fluxes of nutrients in the northwestern Black Sea  

Microsoft Academic Search

The exchange of O2, NH4+, Si(OH)4, ortho-phosphate, Fe2+, Mn2+ and H2S between the sediment and the overlying water (benthic flux) was determined at 6 locations on the northwestern shelf of the Black Sea using an in situ benthic lander. Oxygen consumption by the sediments ranged from 0 to 33 mmol m?2 d?1 depending mostly on the initial oxygen concentration in

Gabriela Friedl; Christian Dinkel; Bernhard Wehrli

1998-01-01

161

Winter Prey Selection of Canada Lynx in Northwestern Montana  

Microsoft Academic Search

ABSTRACT The roles that diet and prey abundance,play in habitat selection of Canada,lynx (Lynx canadensis) in the contiguous,United States is poorly understood. From 1998–2002, we back-tracked radiocollared lynx (6 F, 9 M) for a distance of 582 km and we located 86 kills in northwestern Montana, USA. Lynx preyed on 7 species that included blue grouse (Dendragapus obscurus), spruce grouse

JOHN R. SQUIRES; LEONARD F. RUGGIERO

2007-01-01

162

Palaeontology and Zooarchaeology of Mezmaiskaya Cave (Northwestern Caucasus, Russia)  

Microsoft Academic Search

Over 6000 large mammal and numerous small vertebrate remains have been recovered from preliminary excavations at Mezmaiskaya Cave, situated at 1300–1350m above sea level in the northwestern foothills of the Caucasus Mountains. Most remains were recovered from layers containing Mousterian artefacts that date to the late Middle Pleniglacial (35,000bpand older). The faunal assemblage reflects a very low degree of weathering,

Robin L. Burgess

1996-01-01

163

Seroprevalence of bovine respiratory viruses in North-Western Turkey  

Microsoft Academic Search

Bovine respiratory disease complex is a very important health problem around the world. Present study describes serological\\u000a distribution of bovine major respiratory viruses in non -vaccinated cattle population of Marmara region in north-western Turkey.\\u000a Neutralising antibodies specific to bovine viral diarrhoea virus (BVDV), bovine herpesvirus 1 (BHV-1), bovine respiratory\\u000a syncytial virus (BRSV), bovine parainfluenza virus 3 (PI-3), bovine adenovirus serotype

Kadir Ye?ilba?; Burak Güngör

2008-01-01

164

Dynamics, Patterns and Causes of Fires in Northwestern Amazonia  

PubMed Central

According to recent studies, two widespread droughts occurred in the Amazon basin, one during 2005 and one during 2010. The drought increased the prevalence of climate-driven fires over most of the basin. Given the importance of human-atmosphere-vegetation interactions in tropical rainforests, these events have generated concerns over the vulnerability of this area to climate change. This paper focuses on one of the wettest areas of the basin, Northwestern Amazonia, where the interactions between the climate and fires are much weaker and where little is known about the anthropogenic drivers of fires. We have assessed the response of fires to climate over a ten-year period, and analysed the socio-economic and demographic determinants of fire occurrence. The patterns of fires and climate and their linkages in Northwestern Amazonia differ from the enhanced fire response to climate variation observed in the rest of Amazonia. The highest number of recorded fires in Northwestern Amazonia occurred in 2004 and 2007, and this did not coincide with the periods of extreme drought experienced in Amazonia in 2005 and 2010. Rather, during those years, Northwestern Amazonia experienced a relatively small numbers of fire hotspots. We have shown that fire occurrence correlated well with deforestation and was determined by anthropogenic drivers, mainly small-scale agriculture, cattle ranching (i.e., pastures) and active agricultural frontiers (including illegal crops). Thus, the particular climatic conditions for air convergence and rainfall created by proximity to the Andes, coupled with the presence of one of the most active colonisation fronts in the region, make this region differently affected by the general drought-induced fire patterns experienced by the rest of the Amazon. Moreover, the results suggest that, even in this wet region, humans are able to modify the frequency of fires and impact these historically well preserved forests. PMID:22523580

Armenteras, Dolors; Retana, Javier

2012-01-01

165

Dynamics, patterns and causes of fires in Northwestern Amazonia.  

PubMed

According to recent studies, two widespread droughts occurred in the Amazon basin, one during 2005 and one during 2010. The drought increased the prevalence of climate-driven fires over most of the basin. Given the importance of human-atmosphere-vegetation interactions in tropical rainforests, these events have generated concerns over the vulnerability of this area to climate change. This paper focuses on one of the wettest areas of the basin, Northwestern Amazonia, where the interactions between the climate and fires are much weaker and where little is known about the anthropogenic drivers of fires. We have assessed the response of fires to climate over a ten-year period, and analysed the socio-economic and demographic determinants of fire occurrence. The patterns of fires and climate and their linkages in Northwestern Amazonia differ from the enhanced fire response to climate variation observed in the rest of Amazonia. The highest number of recorded fires in Northwestern Amazonia occurred in 2004 and 2007, and this did not coincide with the periods of extreme drought experienced in Amazonia in 2005 and 2010. Rather, during those years, Northwestern Amazonia experienced a relatively small numbers of fire hotspots. We have shown that fire occurrence correlated well with deforestation and was determined by anthropogenic drivers, mainly small-scale agriculture, cattle ranching (i.e., pastures) and active agricultural frontiers (including illegal crops). Thus, the particular climatic conditions for air convergence and rainfall created by proximity to the Andes, coupled with the presence of one of the most active colonisation fronts in the region, make this region differently affected by the general drought-induced fire patterns experienced by the rest of the Amazon. Moreover, the results suggest that, even in this wet region, humans are able to modify the frequency of fires and impact these historically well preserved forests. PMID:22523580

Armenteras, Dolors; Retana, Javier

2012-01-01

166

Floristic characterisation of alkali soils in northwestern India  

Microsoft Academic Search

Summary  Floristic composition studied in a 40 hectares representative site of alkali soils in the Indo-gangetic plains of Northwestern\\u000a India revealed a remarkably restricted spectrum of natural vegetation. Soil analysis of specific niches, occupied by aggregations\\u000a of different species, was employed to identify alkali halophytes. Response functions of eight prominent species to increasing\\u000a levels of soil alkalinity, studied in pot culture,

R. S. Rana; V. Parkash

1987-01-01

167

Factors affecting waterfowl use of constructed wetlands in northwestern Minnesota  

Microsoft Academic Search

Waterfowl pair and brood use of constructed wetlands was evaluated during 1980–81 on 4 Wildlife Management Areas in northwestern\\u000a Minnesota. Weekly ground counts of waterfowl were made at each of 109 wetlands during the April to mid-July nesting season\\u000a and correlated with physical, vegetative, and limnological characteristics. The number of pairs of the 10 most common waterfowl\\u000a species using the

Douglas A. Leschisin; Gary L. Williams; Milton W. Weller

1992-01-01

168

Geophysical evidence of an impact crater in northwestern South America  

Microsoft Academic Search

A prominent positive terrain correlated free-air gravity anomaly over regionally depressed topography may identify a mascon centered on (4.15 N, 69.5W) in the Vichada plain, Guiana Shield in Northwestern South America. The topographic depression was recognized by LANDSAT images, showing a complex crater with two rings of 30 km and 50 km of diameter. Being one third of the size

O. Hernandez; R. R. von Frese; S. Khurama

2007-01-01

169

Phylogenetic reconstruction within Mycobacterium tuberculosis Beijing genotype in northwestern Russia  

Microsoft Academic Search

A selection of genetic markers was used to study the evolution of Mycobacterium tuberculosis Beijing family strains in northwestern Russia. A total of 221 of 434 epidemiologically unlinked isolates studied in 1996–2001 belonged to the Beijing family as determined by standard spoligotyping (signals 35–43). Ninety-six percent of these Beijing isolates (“typical”) were closely related in IS6110-RFLP (D > 0.85) while 9 remaining

Igor Mokrousov; Olga Narvskaya; Tatiana Otten; Anna Vyazovaya; Elena Limeschenko; Lidia Steklova; Boris Vyshnevskyi

2002-01-01

170

Spatial relationships between swift foxes and coyotes in northwestern Texas  

Microsoft Academic Search

Abstract: Interspecific competition,among,canids can result in mortalities and spatial displacement,of smaller canids by larger canids. To investigate mortalities and spatial relationships of swift foxes ( Vulpes velox) and coyotes (Canis latrans), we captured and radio-tracked both species at Rita Blanca National Grasslands in northwestern Texas. At least 89% of swift fox mortalities were caused by coyotes, resulting in a relatively

Jan F. Kamler; Warren B. Ballard; Rickey L. Gilliland; Kevin Mote

2003-01-01

171

A southwest monsoon hydrographic climatology for the northwestern Arabian Sea  

NASA Astrophysics Data System (ADS)

This paper provides a detailed hydrographic climatology for the shallow northwestern Arabian Sea prior to and during the southwest monsoon, presented as multiple-year composite vertical hydrographic sections based on National Oceanographic Data Center historical ocean station data. Temperature and salinity measurements are used to infer the water masses present in the upper 500 m. The hydrographic evolution depicted on bimonthly sections is inferred to result from wind-driven physical processes. In the northwestern Arabian Sea the water mass in the upper 50 m is the Arabian Sea Surface Water. Waters from 50 to 500 m are formed by mixing of Arabian Sea Surface Water with Antarctic and Indonesian intermediate waters. The inflow of Persian Gulf Water does not significantly influence the hydrography of the northwestern Arabian Sea along the Omani coast. Nitrate has a high inverse correlation with temperature and oxygen in the premonsoon thermocline in the depth interval 50-150 m. During the southwest monsoon, coastal upwelling off Oman and adjacent offshore upward Ekman pumping alter the shallow hydrography.

Brock, John C.; McClain, Charles R.; Hay, W. W.

1992-06-01

172

A southwest monsoon hydrographic climatology for the Northwestern Arabian Sea  

NASA Technical Reports Server (NTRS)

This paper provides a detailed hydrographic climatology for the shallow northwestern Arabian Sea prior to and during the southwest monsoon, presented as multiple-year composite vertical hydrographic sections based on National Oceanographic Data Center historical ocean station data. Temperature and salinity measurements are used to infer the water masses present in the upper 500 m. The hydrographic evolution depicted on bimonthly sections is inferred to result from wind-driven physical processes. In the northwestern Arabian Sea the water mass in the upper 50 m is the Arabian Sea Surface Water. Waters from 50 to 500 m are formed by mixing of Arabian Sea Surface Water with Antarctic and Indonesian intermediate waters. The inflow of Persian Gulf Water does not significantly influence the hydrography of the northwestern Arabian Sea along the Omani coast. Nitrate has a high inverse correlation with temperature and oxygen in the premonsoon thermocline in the depth interval 50-150 m. During the southwest monsoon, coastal upwelling off Oman and adjacent offshore upward Ekman pumping alter the shallow hydrography.

Brock, John C.; Mcclain, Charles R.; Hay, W. W.

1992-01-01

173

Food habits of pumas in northwestern Sonora, Mexico  

USGS Publications Warehouse

It is questionable whether food-habits studies of pumas conducted in the southwestern United States can be extrapolated to northwestern Mexico, because of differences in management, distribution, and abundance of wildlife. We determined food habits of pumas (Puma concolor) in the Sonoran Desert of northwestern Sonora, Mexico. Based on studies in the western United States, we hypothesized that desert mule deer (Odocoileus hemionus) were the major food source of pumas in Sonoran Desert habitats of Mexico. The study area supports populations of desert mule deer, white-tailed deer (Odocoileus virginianus), lagomorphs (Lepus spp. and Sylvilagus audubonii), collared peccary (Pecari tajacu), and the largest population (???300 individuals) of desert bighorn sheep (Ovis canadensis) in Sonora. Based on pugmark characteristics, we recorded 3 different adult resident pumas in approximately 90 km2. We analyzed 60 puma fecal samples collected September 1996-November 1998. Primary prey items based on frequency of occurrence and estimated biomass consumed were desert bighorn sheep (40% and 45%, respectively), lagomorphs (33%, 19%), deer (17%, 17%), and collared peccary (15%, 11%). The high percentage of desert bighorn sheep in puma diets may be due to high abundance relative to mule deer, which declined in number during our study. No differences were found in puma diets between seasons (??22=2.4526, P=0.2934). Fluctuations in mule deer populations in northwestern Sonora may influence prey selection by pumas.

Rosas-Rosas, O. C.; Valdez, R.; Bender, L.C.; Daniel, D.

2003-01-01

174

Hydrogeologic factors affecting cavern morphology within rocks of Mississippian age in northwestern Arkansas  

SciTech Connect

Cavern development within rocks of Mississippian age in northwestern Arkansas is associated with two Pleistocene erosional features, the Boston Mountains Plateau and the Springfield Plateau. Each plateau is characterized by a distinct stratigraphic sequence with unique lithologies. Cavern morphology (both cross-sectional and planimetric) in each plateau is the result of the complex interaction of numerous hydrogeologic factors. Four of the most dominant factors which affect cavern morphology appear to be: (1) composition and continuity of the confining units; (2) percentage of noncarbonate components in rocks of the cavern-forming interval; (3) nature and distribution of ground-water recharge to the cavern-forming interval; and (4) nature and distribution of fractures within the cavern-forming interval. Network maze patterns typically develop in the Pitkin Limestone, the formation in which most caverns form beneath the Boston Mountains Plateau. The Pitkin, a bioclastic limestone, is confined above by siltstones of the Cane Hill member of the Hale Formation and below by shales of the Fayetteville Formation. The maze pattern indicates that these caverns probably were formed by dissolution of the rock matrix by diffuse recharge moving vertically through leaky confining units. Single rooms are the dominant cavern morphology in the chert-dominated Boone Formation of the Springfield Plateau. Where the concentration of chert is greater than 50 percent, the Boone lacks structural integrity and fails to develop well-integrated conduit networks. Point recharge features in outcrop areas of the Boone Formation are not visible in most of the Springfield Plateau because the insoluble residuum masks the upper bedrock surface. Where the Boone Formation is less than 7 meters thick, surface karst features are more prevalent.

Fanning, B.J. (Univ. of Arkansas, Fayetteville, AR (United States). Dept. of Geology); Brahana, J.V. (Univ. of Arkansas , Fayetteville, AR (United States). Geological Survey)

1993-02-01

175

Judd A. and Marjorie Weinberg College of Arts and Sciences, Northwestern University Introducing the Weinberg  

E-print Network

and World Report annual survey consistently ranks Northwestern among the best undergraduate programs Planetarium, and the Museum of Science and Industry; renowned architecture and architectural tours; zoos

Mohseni, Hooman

176

Habitat selection by American martens (Martes americana) in coastal northwestern California.  

E-print Network

??The Humboldt marten, Martes americana humboldtensis, has undergone a dramatic decline throughout its historical distribution in coastal Northwestern California. There is currently only one known… (more)

Slauson, Keith M.

2003-01-01

177

Cross-shelf exchange in the northwestern Black Sea  

NASA Astrophysics Data System (ADS)

transports of water, heat, and salt between the northwestern shelf and deep interior of the Black Sea are investigated using a high-resolution three-dimensional primitive equation model. From April to August 2005, both onshore and offshore cross-shelf break transports in the top 20 m were 0.24 Sv on average, which is equivalent to the replacement of 60% of the volume of surface shelf waters (0-20 m) per month. Two main exchange mechanisms are studied: Ekman transport, and transport by mesoscale eddies and associated meanders of the Rim Current. The Ekman drift causes nearly uniform onshore or offshore flow over a large section of the shelf break, but it is confined to the upper layers. In contrast, eddies and meanders penetrate deep down to the bottom, but they are restricted laterally. During the strong wind events of 15-22 April and 1-4 July, some 0.66 × 1012 and 0.44 × 1012 m3 of water were removed from the northwestern shelf, respectively. In comparison, the single long-lived Sevastopol Eddy generated a much larger offshore transfer of 2.84 × 1012 m3 over the period 23 April to 30 June, which is equivalent to 102% of the volume of northwestern shelf waters. Over the study period, salt exchanges increased the average density of the shelf waters by 0.67 kg m-3 and reduced the density contrast between the shelf and deep sea, while lateral heat exchanges reduced the density of the shelf waters by 0.16 kg m-3 and sharpened the shelf break front.

Zhou, Feng; Shapiro, Georgy; Wobus, Fred

2014-04-01

178

Argonne is a partner in the Argonne-Northwestern Solar Energy Research Center led by Northwestern University. Argonne is a partner in the Center for Emergent Superconductivity led by Brookhaven National Laboratory.  

E-print Network

Argonne is a partner in the Argonne-Northwestern Solar Energy Research Center led by Northwestern Conductivity (CES) W. Kwok (MSD) Argonne-Northwestern Solar Energy Research (ANSER) M. Pellin (MSD) #12; Administrative Support J. Hogan and G. Cutinello Chemical Sciences & Engineering (CSE) E.E. Bunel High Energy

Kemner, Ken

179

PAGE 1 Northwestern University Health Service 633 Emerson Street Evanston, IL. 60208 | Phone: 847-491-8100 | Fax: 847-491-8699 rev.3/2013 lat Northwestern University Health Service  

E-print Network

PAGE 1 Northwestern University Health Service ­ 633 Emerson Street ­ Evanston, IL. 60208 | Phone. Mail to: Northwestern University Health Service, Health Information Management Services, 633 Emerson St will be applied to your account. #12;PAGE 2 Northwestern University Health Service ­ 633 Emerson Street ­ Evanston

Chisholm, Rex L.

180

Contemporary radioecological state of the North-western Black Sea and the problems of environment conservation.  

PubMed

Review is devoted to the analysis of a radioecological situation in the North-western Black Sea and concerns the levels of contamination of the components of an ecosystem by the main artificial radioactive isotopes ((90)Sr, (137)Cs, (239,240)Pu). The long-term accumulation trends of these radionuclides were analyzed in components of the Black Sea ecosystem after the Chernobyl nuclear power plant accident. Zones that have an increased ability to accumulate these radioisotopes were revealed. The assessment of irradiation dose rates formed by (90)Sr, (137)Cs and (239,240)Pu in Black Sea hydrobionts was obtained. The strategy for biodiversity conservation and sustainable management of natural resources should include monitoring of the radioecological state of the marine ecosystems, and the formation of a complex of biogeochemical criteria for assessment of an ecological situation in the sea. This approach is important for marine protected areas, since it allows the formation of a basis for scientific and practical function. PMID:24461697

Tereshchenko, N N; Mirzoyeva, N Yu; Gulin, S B; Milchakova, N A

2014-04-15

181

Regional correlation of deposition sequences in the southern Mesozoic marine province, northwestern Nevada  

SciTech Connect

Strata of the Mesozoic marine province of a northwestern Nevada, deposited in subaerial to deep marine environment in a backarc basin, underwent severe deformation during the late Mesozoic. Restoration of stratigraphic relations among constituent volcanic, volcanogenic, carbonate, and continentally-derived siliciclastic rocks has been hampered by sparse biostratigraphic age control. Regional correlation of coeval facies is made possible by coupling depositional sequences with biostratigraphic control in the southwestern Gabbs Valley Range, the southern Shoshone Mountains, and the southern Clan Alpine Mountains, which serve as reference sections for Late Triassic and Early Jurassic ammonite zonation of western North America. Differentiation between regionally significant sequence boundaries and those of limited areal extent is possible only by linking the biostratigraphy and physical stratigraphic relations, such as abrupt vertical transitions in lithology corresponding to large facies changes. Physical stratigraphic relations alone are not adequate for correlation ad indicated by the diachronous initiation of Early to Middle( ) Jurassic deposition in half-graben basins (Dunlap Formation) which locally cloaks eustatically( ) controlled depositional sequences. Within these limitations, three regionally extensive sequences are recognized in the reference sections and have lower boundaries at the base of Upper Triassic shallow marine to deltaic carbonate-clastic rocks (Luning Formation) and at the base and within subtidal to offshore-marine carbonate and clastic rocks (Triassic and Jurassic Volcano Peak Group).

Satterfield, J.I.; Oldow, J.S. (Rice Univ., Houston, TX (United States). Dept. of Geology and Geophysics)

1993-04-01

182

Finite frequency tomography fort the northwestern Pacific region  

NASA Astrophysics Data System (ADS)

We constructed a new P-wave tomographic model of the whole mantle with a focus on the northwestern Pacific region using more than ten millions of travel time data. The subducted slabs in the northwestern Pacific region show a complicated morphology; the slabs subducted from the south Kurile, Japan, Izu-Bonin arcs tend to be trapped in the mantle transition region, while to the north beneath the north Kurile and to the south beneath Mariana the slabs tend to penetrate the 660-km seismic discontinuity. To understand the relationship between such different behaviors of the subducted slabs, broadband seismic networks in the western Pacific Ocean and in the Russian Far East were deployed along with the Stagnant Slab Project (Japan) from 2005 to 2007. We collected other broadband seismograms in the northwestern Pacific region including Japan, China and the islands in the region. We picked the onsets of the first arrivals on the unfiltered seismograms if possible. The background noise level of the broadband ocean bottom seismogram is, in general, high in the periods less than 5 second due to the microseisms (pressure variations on the ocean floor induced by ocean waves) and in the periods around 100sec due to the infragravity waves. However the noise level takes a minimum and is comparable to that of the land stations in the periods in between. Therefore we measured P-wave differential times between two stations by applying the band-pass filter at the corners 0.03 and 0.08 Hz. We also measured PP-P differential times on the broadband seismograms of the global stations in around 0.1Hz frequency band. Finite frequency kernels were calculated at the corresponding frequency band for these differential travel time data. The finite frequency effect was also taken into account for the handpicked and the ISC data by calculating finite frequency kernels at 2 Hz instead of the ray theory. Such treatment for the handpicked data helps to reduce the artificial structures in the less resolved regions when the tomographic model constructed from the high frequency handpicked data and the lower frequency differential traveltime data simultaneously. The resolution of the obtained model become much better along the northwestern Pacific trenches than our previous model. The transition between the slab stagnation and penetration along the Izu-Bonin to Mariana trenches are well resolved.

Obayashi, M.; Yoshimitsu, J.; Nolet, G.; Fukao, Y.; Shiobara, H.; Sugioka, H.; Kasahara, M.; Gao, Y.

2012-12-01

183

African Oral Traditions: Riddles Among The Haya of Northwestern Tanzania  

NASA Astrophysics Data System (ADS)

This study argues for the integration of African oral traditions and other elements of traditional learning into the modern school curriculum. It thus contributes to supporting the increased relevance of education to local communities. In particular, using the example of riddles collected from one of the main ethnic groups in Northwestern Tanzania, the Haya people, the present study challenges the views of those social and cultural anthropologists who hold that African riddles have no substantially meaningful educational value. Instead, it is maintained that riddles make an important contribution to children's full participation in the social, cultural, political, and economic life of African communities, especially by fostering critical thinking and transmitting indigenous knowledge.

Ishengoma, Johnson M.

2005-05-01

184

The Center for Talent Development at Northwestern University: An Example of Replication and Reformation  

ERIC Educational Resources Information Center

This article describes implementation of the talent search model developed by Julian Stanley at the Center for Talent Development of Northwestern University. While remaining true to the basic components of the talent search, the talent center at Northwestern has emphasized using talent search as a means to influence programming in local schools…

Olszewski-Kubilius, Paula

2005-01-01

185

IMPACTS OF A HIGHWAY EXPANSION PROJECT ON WOLVES IN NORTHWESTERN WISCONSIN  

E-print Network

IMPACTS OF A HIGHWAY EXPANSION PROJECT ON WOLVES IN NORTHWESTERN WISCONSIN (Preliminary Findings the impacts of upgrading 71 km of US Highway 53 (US 53) from 2-lanes into 4-lanes on wolves (Canis lupus) in northwestern Wisconsin. Our main objectives were to assess the impacts of the highway project on resident

Gehring, Thomas M.

186

Northwestern University Archives Evanston, Illinois Ernest Samuels (1903-1996) Papers, 1918-1995  

E-print Network

wrote a thesis on Henry David Thoreau's literary reputation, he received a Master of Arts in English literature, and accordingly, his dissertation topic was, "The Early Career of Henry Adams." Samuels received at Northwestern Samuels continued his research on the career of Henry #12;Northwestern University Archives

187

Effects of partial cutting on the ectomycorrhizae of Picea glauca forests in northwestern Alberta  

E-print Network

Effects of partial cutting on the ectomycorrhizae of Picea glauca forests in northwestern Alberta) on ectomycorrhizae (ECM) associated with white spruce (Picea glauca (Moench) Voss) in northwestern Alberta, Canada'épinette blanche (Picea glauca (Moench) Voss) dans le nord-ouest de l'Alberta, au Canada. Les traitements

Macdonald, Ellen

188

POPULATIONS OF HORSESHOE CRABS, LIMULUS POLYPHEMUS, ON THE NORTHWESTERN ATLANTIC CONTINENTAL SHELF  

E-print Network

POPULATIONS OF HORSESHOE CRABS, LIMULUS POLYPHEMUS, ON THE NORTHWESTERN ATLANTIC CONTINENTAL SHELF ofhorseshoe crabs, Limu/u8 polyphemus CL.l. on the Middle Atlantic continental shelf. based on Northeast distributions of horseshoe crabs on the northwestern Atlantic continental shelf. North- east Fisheries Center

189

NORTHWESTERN SALAMANDER (AMBYSTOMA GRACILE) OVIPOSITION SITES AND HATCHING SUCCESS IN THE CASCADE MOUNTAINS OF SOUTHERN WASHINGTON  

Microsoft Academic Search

Reproductive success of amphibians is influenced by choice of oviposition sites, including Northwestern Salamanders (Ambystoma gracile) whose egg masses are fixed to vegetation. During summers of 1999-2002, I surveyed 33 permanent ponds in a 26 ha wetland (935 m elevation) for Northwestern Salamander egg masses, quantified oviposition site characteristics, and tracked embryonic development and survival. The number of egg masses

JAMES G. MACCRACKEN

2007-01-01

190

Northwestern University Archives Evanston, Illinois WOMEN'S SELF-GOVERNMENT ASSOCIATION SCRAPBOOK, 1926-1931  

E-print Network

, these organizations had little to do with the governance of women students. In 1906, the Women's League was formedNorthwestern University Archives · Evanston, Illinois WOMEN'S SELF-GOVERNMENT ASSOCIATION SCRAPBOOK, 1926-1931 Series 30/14 Box 1 (dropfront box) History Northwestern University's Women's Self

191

Five species of sea turtles in the northwestern Atlantic Ocean are  

E-print Network

671 Five species of sea turtles in the northwestern Atlantic Ocean are protected under the U in the sea scallop (Placopecten magellanicus) dredge fishery in two areas of the northwestern Atlantic Ocean Service (NMFS) opened two areas in the northwest- ern Atlantic Ocean that had been previously closed

192

Last Interglacial marine environments in the White Sea region, northwestern Russia  

E-print Network

, northwestern Russia. Boreas, Vol. 35, pp. 493Á520. Oslo. ISSN 0300-9483. Marine sediments from river sections in the Mezen River drainage, northwest Russia, have been analysed for dinoflagellate cysts, foraminifersLast Interglacial marine environments in the White Sea region, northwestern Russia KARI GR�SFJELD

Ingólfsson, �lafur

193

Vegetational and climatic significance of modern pollen rain in northwestern Tibet  

Microsoft Academic Search

In northwestern Tibet, an atmospheric pollen sampling was performed weekly during one year (August 1989 to August 1990). Moreover, 18 dust flux samples were obtained in the same region which covers three geographical units: the western margin of the Taklimakan desert, the northern Karakorum and the northwestern Kunlun mountains. The atmospheric pollen results show that the annual pollen frequency is

P Cour; Z Zheng; D Duzer; M Calleja; Z Yao

1999-01-01

194

Paleoseismicity of the Southern End of the Cascadia Subduction Zone, Northwestern California  

E-print Network

Paleoseismicity of the Southern End of the Cascadia Subduction Zone, Northwestern California Abstract The southern end of the Cascadia subduction zone (CSZ) in northwestern California poses a high) and Atwater (1987), the earthquake and tsunami threat along the Cascadia subduction zone (CSZ) was classified

Keller, Ed

195

Important Notice from Northwestern University About Your Prescription Drug Coverage and Medicare  

E-print Network

Important Notice from Northwestern University About Your Prescription Drug Coverage and Medicare the current prescription drug coverage available through Northwestern University and about your options under Medicare's prescription drug coverage. This information can help you decide whether or not you want to join

Shahriar, Selim

196

Marine geology and tectonic evolution of the northwestern margin of the California continental borderland  

Microsoft Academic Search

The geology and history of the northwestern margin of the California continental borderland are examined using data from seismic-reflection profiling and bottom sampling. It is suggested that the northwestern margin of the borderland along with the western Transverse Ranges was rifted from an original tectonic setting off northern Baja California begining about 18 m.y. ago. During the rifting event, the

J. K. Crouch

1979-01-01

197

NORTHWESTERN NATURALIST 88:147154 WINTER 2007 A COMPARISON OF GROUND-BASED AND TREE-BASED  

E-print Network

-BASED POLYVINYL CHLORIDE PIPE REFUGIA FOR CAPTURING PSEUDACRIS REGILLA IN NORTHWESTERN CALIFORNIA CALE H MYERS the Pacific Treefrog (Pseudacris regilla) in northwestern California. We recorded a total of 464 P. regilla: Pacific Treefrog, Hyla regilla, Pseudacris regilla, polyvinyl chloride, pipe refugia, northwestern

Johnson, Matthew

198

Geochemical study of products associated with spontaneous oxidation of coal in the Cerro Pelado Formation, Venezuela  

Microsoft Academic Search

The aim of this research work is a geochemical, mineralogical, and textural characterization of spontaneously smouldered coal-derived products in northwestern Venezuela (Cerro Pelado Formation, some 10km from Pedregal city). Several solid samples were collected from this formation, six of unweathering coal, an other six of resulting unmelted rocks forming on a surface coal bed, and the last four of mineralizations

M. Martínez; G. Márquez; F. J. Alejandre; J. J. Del Río; A. Hurtado

2009-01-01

199

Great Earthquakes and Tsunamis of the Northwestern Aceh Coast, Sumatra  

NASA Astrophysics Data System (ADS)

The 2004 Andaman Aceh earthquake occasioned coseismic coastal subsidence in the range of 0.5 to 2.0 m on the northwestern Aceh coast. This coastal lowland contains stratigraphic evidence of previous great earthquakes and tsunamis on the Sunda megathrust that affected the coastline for hundreds of kilometers. We focused our research at three coastal sites in northwestern Aceh province. We conclude that three subduction zone earthquakes occurred in the early to mid Holocene (4500-7000 years ago) with an average recurrence of approximately 1000 years during conditions of relative sea level rise. Detailed investigations of lithology and micro- and macrofossil assemblages reveal regionally extensive buried mangrove soils that were coseismically subsided during the earthquakes and abruptly overlain by thin sand deposits of tsunami origin. The sands are covered by a sequence of intertidal muds. Tsunami deposits are inconsistently preserved, whereas the coseismic signal from buried soils is ubiquitously preserved. There is no stratigraphic record of subsidence in the late Holocene (4500 years to present) along the same coastal reach. In this time interval, far field locations such as Sumatra record stable or falling relative sea levels, which precludes coastal weltand progradation that leads to preservation of buried soils. In this younger, late Holocene time interval, the search for unique depocenters that preserve tsunami deposits provides a promising, alternative approach to constructing a paleoseimic record for the Aceh portion of the Sunda subduction zone.

Kelsey, H. M.; Horton, B. P.; Rubin, C. M.; Daly, P.; Grand Pre, C.; Hawkes, A.; Daryono, M.; Ismail, N.

2011-12-01

200

Stratigraphic Analysis of Upper Cretaceous Rocks in the Mahajanga Basin, Northwestern Madagascar: Implications for Ancient and Modern Faunas.  

PubMed

Upper Cretaceous strata of the Mahajanga Basin, northwestern Madagascar, yield some of the most significant and exquisitely preserved vertebrate fossils known from Gondwana. The sedimentology of these strata and their stratigraphic relations have been the focus of renewed geological investigations during the course of five expeditions since 1993. We here designate stratotypes and formalize the terrestrial Maevarano Formation, with three new members (Masorobe, Anembalemba, Miadana), and the overlying marine Berivotra Formation. The Maevarano Formation accumulated on a broad, semiarid alluvial plain bounded to the southeast by crystalline highlands and to the northwest by the Mozambique Channel. The Berivotra Formation was deposited in an open marine setting that evolved from a clastic- to a carbonate-dominated shelf, resulting in deposition of the overlying Betsiboka limestone of Danian age. New stratigraphic data clearly indicate that the Maevarano Formation correlates, at least in part, with the Maastrichtian Berivotra Formation, and this in turn indicates that the most fossiliferous portions of the Maevarano Formation are Maastrichtian in age, rather than Campanian as previously reported. This revised age for the Maevarano vertebrate assemblage indicates that it is approximately contemporaneous with the vertebrate fauna recovered from the Deccan basalt volcano-sedimentary sequence of India. The comparable age of these two faunas is significant because the faunas appear to be more similar to one another than either is to those from any other major Gondwanan landmass. The revised age of the Maevarano Formation, when considered in the light of our recent fossil discoveries, further indicates that the ancestral stocks of Madagascar's overwhelmingly endemic modern vertebrate fauna arrived on the island in post-Mesozoic times. The basal stocks of the modern vertebrate fauna are conspicuously absent in the Maevarano Formation. Finally, the revised age of the Maevarano Formation serves to expand our global perspective on the K/T event by clarifying the age of a diverse, and arguably the best preserved, sample of Gondwanan vertebrates from the terminal Cretaceous. PMID:10769157

Rogers; Hartman; Krause

2000-05-01

201

Geogenic sources of local arsenic enrichment in groundwater from northwestern Thuringia, Germany  

NASA Astrophysics Data System (ADS)

Aqueous fluids migrating in the Earth's crust interact with the host rocks and partially take up their geochemical signatures. Mineralization and sometimes geogenic contamination of the groundwater may be the consequence: The aquifer systems of the Lower Triassic Buntsandstein Formation, an important source of drinking water in north-western Thuringia, and the Rotliegend Formation are locally affected by elevated arsenic concentrations. Data from water wells locally show arsenic concentrations above the limit value for drinking water (10 ?g/L). The regional distribution as well as lack of secondary vein mineralizations or anthropogenic sources within this area point to a geogenic stratibound source of arsenic. The average concentration of the toxic, carcinogenic trace element arsenic in rocks of Phanerozoic rocks in Germany range from 5 to 12 ?g/g for different lithologies, being generally higher in Variscan rocks. However, it can be several times enriched in certain sedimentary lithologies such as pelites and even more so in coal beds. In our present study we investigate all sequences of the Buntsandstein and Rotliegend Formation with their different lithologies in order to identify the relevant carriers of arsenic. Geochemical analyses on samples from selected drill cores and outcrops show arsenic of >50 ?g/g especially in carbonaceous sediment sections as well as in primarily gray-green lacustrine clay stones. Elevated arsenic concentrations seem to be related to lithofacies of lacustrine origin in the Buntsandstein and carbonaceous sediment sections in the Rotliegend. Aim of the current study is now to identify the appropriate synsedimentary mineral phases that incorporate arsenic and to identify the processes and conditions under which arsenic is mobilized from these phases and transferred into the groundwater.

Abratis, Michael; Viereck, Lothar

2014-05-01

202

Investigation of Salt Loss from the Bonneville Salt Flats, Northwestern Utah  

USGS Publications Warehouse

The Bonneville Salt Flats study area is located in the western part of the Great Salt Lake Desert in northwestern Utah, about 110 miles west of Salt Lake City. The salt crust covers about 50 square miles, but the extent varies yearly as a result of salt being dissolved by the formation and movement of surface ponds during the winter and redeposited with the evaporation of these ponds during the summer. A decrease in thickness and extent of the salt crust on the Bonneville Salt Flats has been documented during 1960-88 (S. Brooks, Bureau of Land Management, written commun., 1989). Maximum salt-crust thickness was 7 feet in 1960 and 5.5 feet in 1988. No definitive data are available to identify and quantify the processes that cause salt loss. More than 55 million tons of salt are estimated to have been lost from the salt crust during the 28-year period. The Bureau of Land Management needs to know the causes of salt loss to make appropriate management decisions.

Mason, James L.; Kipp, Kenneth L., Jr

1997-01-01

203

A trace of Au-rich coal in Tuha Basin on northwestern China  

SciTech Connect

A series of samples, collected from Jurassic coal in Tuha Basin of northwestern China, is analyzed qualitatively by secondary ion mass spectrometry (SIMS) and quantitatively by inductively coupled plasma mass spectrometry (ICP/MS). Gold (Au), silver (Ag) and the rare earth elements (REE) are detected with unusually high content (positive difference) in the original coals in some seams, such as Au about 43{plus_minus}0.32 ppm, Ag 542{plus_minus}4.8ppm, Lu 31{plus_minus}0.33 ppm, Tl 7.1{plus_minus}0.74ppm and Cu 40{plus_minus}3.7 ppm. The data also show that gold absorbs more in the organic phase than in pyrite in the coal and a with very low content (negative difference) both in bed roofs (clay rock) and in bed plates (seat earth) such as Au 0.57 ppb for the later. It is evident that the weathering mechanism probably corresponds to formation of the Au-rich coal.

Liang, H. [China Univ. of Mining and Technology, Beijing (China)

1997-12-31

204

Field methods to evaluate effects of pesticides on wildlife of the northwestern United States  

USGS Publications Warehouse

Field .methods used to evaluate the impact of organochlorine and organophosphate pesticides on wildlife populations in the Pacific Northwest are reviewed. Five field studies, presented in a CASE HISTORY format, illustrate study designs .and thetypes of information collected. The pesticides investigated included DDT, heptachlor, endr1n, and famphur, and the species studied included the American kestrel (Falco sparverius), Canada goose (Branta canadensis}, black--crowned night-heron (Nycticorax nycticorac), and black-billed magpie (Pica pica). Wildlife biologists conducting field studies of pesticides encounter a variety of design and logistics problems. However, a number of procedures are now available to the researcher for field evaluations. The three principa1 types of insecticides (organochlorines (OC's), organophosphates (OP's) and carbamates (CB's) require different field approaches. In this paper, five field studies, conducted by my colleagues and me between 1974 and 1982, in the northwestern portion of the United States (Washington, Oregon, Idaho, and northern Nevada), are reviewed to illustrate procedures for evaluating the effects of these insecticides.on wildlife populations. Althought most OC pesticides were banned in the United States during the 1970's (.for review, see F1eming et al. 1983), we studied several OC applications, including the last major DDT spray project in 1974. Use of OP's and CB's increased during the 1970's and 1980s as the OC's were phased out.

Henny, C.J.

1987-01-01

205

Previously unrecognized ornithuromorph bird diversity in the Early Cretaceous Changma Basin, Gansu Province, northwestern China.  

PubMed

Here we report on three new species of ornithuromorph birds from the Lower Cretaceous Xiagou Formation in the Changma Basin of Gansu Province, northwestern China: Yumenornis huangi gen. et sp. nov., Changmaornis houi gen. et sp. nov., and Jiuquanornis niui gen. et sp. nov.. The last of these is based on a previously published but unnamed specimen: GSGM-05-CM-021. Although incomplete, the specimens can be clearly distinguished from each other and from Gansus yumenensis Hou and Liu, 1984. Phylogenetic analysis resolves the three new taxa as basal ornithuromorphs. This study reveals previously unrecognized ornithuromorph diversity in the Changma avifauna, which is largely dominated by Gansus but with at least three other ornithuromorphs. Body mass estimates demonstrate that enantiornithines were much smaller than ornithuromorphs in the Changma avifauna. In addition, Changma enantiornithines preserve long and recurved pedal unguals, suggesting an arboreal lifestyle; in contrast, Changma ornithuromorphs tend to show terrestrial or even aquatic adaptions. Similar differences in body mass and ecology are also observed in the Jehol avifauna in northeastern China, suggesting niche partitioning between these two clades developed early in their evolutionary history. PMID:24147058

Wang, Ya-Ming; O'Connor, Jingmai K; Li, Da-Qing; You, Hai-Lu

2013-01-01

206

Perched groundwater at the northwestern coast of Egypt: a case study of the Fuka Basin  

NASA Astrophysics Data System (ADS)

Perched groundwater resources on the northwestern coast of Egypt have thus far been little studied. However, if replenished by rainwater, they can provide a considerable amount of renewable water, i.e., for sustainable irrigation. These resources are limited, show different salinity contents and are endangered by overuse, pollution and by the sea level rising in the context of global warming. This paper presents new climatic data, geomorphologic, geologic, geochemical and hydrological researches in combination with remote sensing and GIS applications from Fuka Basin. Fuka constitutes a special synclinal basin where the interbedded limestone and clays have been folded into gentle synclinal structures. Fractured Middle Miocene limestone represents the bearing formation for the perched groundwater. According to the hydrogeochemical analysis and the PHREEQC model, the aquifer is recharged during the winter season by rainwater from the surrounding tableland and the chemical evolution of the perched water is attributed to water-rock interaction and mixing of fresh water with sea water. The salinity of the perched water ranges from 2,126 to 2,644 mg/L whereas for the deep groundwater it reaches 9,800 mg/L. The study explores origin and potential of the perched groundwater of Fuka Basin and gives recommendations for a future sustainable use and further investigations.

Yousif, Mohamed; Bubenzer, Olaf

2012-03-01

207

Previously Unrecognized Ornithuromorph Bird Diversity in the Early Cretaceous Changma Basin, Gansu Province, Northwestern China  

PubMed Central

Here we report on three new species of ornithuromorph birds from the Lower Cretaceous Xiagou Formation in the Changma Basin of Gansu Province, northwestern China: Yumenornis huangi gen. et sp. nov., Changmaornis houi gen. et sp. nov., and Jiuquanornis niui gen. et sp. nov.. The last of these is based on a previously published but unnamed specimen: GSGM-05-CM-021. Although incomplete, the specimens can be clearly distinguished from each other and from Gansus yumenensis Hou and Liu, 1984. Phylogenetic analysis resolves the three new taxa as basal ornithuromorphs. This study reveals previously unrecognized ornithuromorph diversity in the Changma avifauna, which is largely dominated by Gansus but with at least three other ornithuromorphs. Body mass estimates demonstrate that enantiornithines were much smaller than ornithuromorphs in the Changma avifauna. In addition, Changma enantiornithines preserve long and recurved pedal unguals, suggesting an arboreal lifestyle; in contrast, Changma ornithuromorphs tend to show terrestrial or even aquatic adaptions. Similar differences in body mass and ecology are also observed in the Jehol avifauna in northeastern China, suggesting niche partitioning between these two clades developed early in their evolutionary history. PMID:24147058

Wang, Ya-Ming; O'Connor, Jingmai K.; Li, Da-Qing; You, Hai-Lu

2013-01-01

208

Biostratigraphy of a Middle Miocene-Pliocene sequence from Cumarebo area, Falcon State, northwestern Venezuela  

SciTech Connect

The southern Caribbean region offers little in the way of continuous sequences for the late Neogene. An upward facies shallowing trend unfavorable for planktonic foraminifers and erosional truncation seems to be almost a rule for such sediments. A fairly complete sedimentary sequence mainly represented by clays, silts, and carbonate rocks from the Cumarebo region, Falcon State, northwestern Venezuela, was chosen to study the biostratigraphy of the late Neogene using foraminifers. More than one hundred surface samples were analyzed throughout. The study of foraminiferal fossil assemblages and other microfossils was also used to define paleoenvironments of deposition. Four formations are involved in this work. From base to top they are the Socorro, Caujarao, El Veral, and Tucupido. From the study of planktonic foraminifers, six biostratigraphic zones were recognized: Globorotalia mayeri Zone, Globorotalia menardii Zone, Globorotalia acostaensis Zone, Globorotalia humerosa Zone, Globorotalia margaritae Zone, and Globorotalia miocenica Zone. These zones indicate that the age of the sequence ranks from late middle Miocene to middle Pliocene. Generally speaking, with some variations, the paleoenvironments of the sequence show a shallowing trend from marine upper-middle bathyal to middle neritic. These results make an important contribution to the stratigraphy and geologic history of the Cumarebo area, which is related to the Agua Salada basin, and may help clarify the paleogeography and paleotectonic evolution of this region for petroleum exploration.

Giffuni, G. (INTEVEP, S.A., Caracas (Venezuela))

1991-03-01

209

Intoxication of nontarget wildlife with rodenticides in northwestern Kansas.  

PubMed

The perception of prairie dogs (Cynomys spp.) both as a nuisance species and a keystone species presents a significant challenge to land, livestock, and wildlife managers. Anticoagulant and nonanticoagulant rodenticides are commonly employed to control prairie dog populations throughout their range. Chlorophacinone, and to a lesser extent zinc phosphide, are widely used in northwestern Kansas for controlling black-tailed prairie dog (Cynomys ludovicianus) populations. Although zinc phosphide poisoning of gallinaceous birds is not uncommon, there are few published accounts of nontarget chlorophacinone poisoning of wildlife. We report three mortality events involving nontarget rodenticide poisoning in several species, including wild turkeys (Meleagris gallopavo), a raccoon (Procyon lotor), and an American badger (Taxidea taxus). This includes the first documentation of chlorophacinone intoxication in wild turkeys and an American badger in the literature. The extent of nontarget poisoning in this area is currently unknown and warrants further investigation. PMID:21270011

Ruder, Mark G; Poppenga, Robert H; Bryan, John A; Bain, Matt; Pitman, Jim; Keel, M Kevin

2011-01-01

210

Floods of January 15-17, 1974, in Northwestern Montana  

USGS Publications Warehouse

Introduction Rain and snowmelt caused several streams in northwestern Montana to flood during January 15-17, 1974. The flooding was caused by a major rainstorm that extended from Montana through Idaho and Washington. The most damage occurred in the Kootenai River drainage, centering around the town of Libby. Also unusually high flows occurred on some streams in the Clark Fork basin. Throughout the area, ice jams contributed to much of the overbank flooding. Both the towns of Troy and Libby were partly flooded, but damage was greatest in and near Libby. Flood damage was estimated to be $4.9 million. No flood fatalities were listed. Most of the smaller streams equaled or exceeded a 50-year flood. A summary of flood stages and discharges for 24 sites in the Kootenai River drainage and 8 sites in the Clark Fork drainage is tabulated. A map shows the extent of flooding in the Libby area. (Woodard-USGS)

Johnson, M.V.; Omang, R.J.

1974-01-01

211

Geophysical interpretations of the Libby thrust belt, northwestern Montana  

USGS Publications Warehouse

Interpretations of gravity and aeromagnetic anomaly data, supplemented by results from two seismic reflection profiles and five magnetotelluric soundings, were used to study buried structure and lithology of the Libby thrust belt of northwestern Montana. The gravity anomaly data show a marked correlation with major structures. The Purcell anticlinorium and the Sylvanite anticline are very likely cored by stacks of thrust slices of dense crystalline basement rocks that account for the large gravity highs across these two structures. Gravity anomaly data for the Cabinet Mountains Wilderness show a string of four broad highs. The principal magnetic anomaly sources are igneous intrusive rocks, major fault zones, and magnetite-bearing sedimentary rocks of the Ravalli Group. The most important magnetic anomalies in the principal study area are five distinct positive anomalies associated with Cretaceous or younger cupolas and stocks.

Kleinkopf, M. Dean; with sections by Harrison, Jack Edward; Stanley, W. D.

1997-01-01

212

Ankylosaur remains from the early cretaceous (valanginian) of northwestern Germany.  

PubMed

A fragmentary cervico-pectoral lateral spine and partial humerus of an ankylosaur from the Early Cretaceous (early Valanginian) of Gronau in Westfalen, northwestern Germany, are described. The spine shows closest morphological similarities to the characteristic cervical and pectoral spines of Hylaeosaurus armatus from the late Valanginian of England. An extensive comparison of distal humeri among thyreophoran dinosaurs supports systematic differences in the morphology of the distal condyli between Ankylosauria and Stegosauria and a referral of the Gronau specimen to the former. The humerus fragment indicates a rather small individual, probably in the size range of H. armatus, and both specimens are determined herein as ?Hylaeosaurus sp.. A short overview of other purported ankylosaur material from the Berriasian-Valanginian of northwest Germany shows that, aside from the material described herein, only tracks can be attributed to this clade with confidence at present. PMID:23560099

Sachs, Sven; Hornung, Jahn J

2013-01-01

213

Sinking velocity of particulate radiocesium in the northwestern North Pacific  

NASA Astrophysics Data System (ADS)

particles (SP) were collected by time series sediment traps at two depths in the northwestern Pacific before and after the Fukushima Daiichi Nuclear Power Plant accident, and accident-derived particulate radiocesium was measured. Radiocesium (137Cs) was first detected at 500 m (4810 m) about 2 weeks (1 month) after the accident. 137Cs of SP collected over 1 year revealed that the time lag between two depths was larger than that for the first 137Cs detection (about 2 weeks). We estimated the transient sinking velocity (SV) from the cumulative temporal 137Cs flux and the time lags at the two depths. Although the SV of SP collected in very early period was large, the estimated SV of most particulate 137Cs (about 80%) was about 50 m d-1. Based on comparison of 137Cs concentration in total SP with that in SP without organic materials, we suspect that most of the 137Cs was likely incorporated into aluminosilicates.

Honda, Makio C.; Kawakami, Hajime

2014-06-01

214

Hydrologic investigations and data-collection network in strippable coal-resource areas in northwestern New Mexico  

USGS Publications Warehouse

This report presents hydrologic investigations and data collections conducted by the U.S. Geological Survey in the strippable coal areas of northwestern New Mexico. Streamflow, ground-water, and quality-of-water data were collected to provide information about baseline or prevailing hydrologic conditions. A network of hydrologic data-collection sites in the strippable coal areas of the Fruitland Formation was designed to meet the need of detailed investigations, including site-specific studies, and to provide hydrologic data in support of the expanding mining activity. The network consists of 34 continuous-record streamflow-gaging stations (32 included water-quality sampling), 20 miscellaneous water quality of streamflow stations, 12 annual maximum discharge stations, 27 observation wells completed in strata associated with the strippable coal seams, and 24 observation wells completed in channel alluvium downstream from strippable coal areas. (USGS)

Hejl, H.R.

1982-01-01

215

Estimating salinity to complement observed temperature: 2.Northwestern Atlantic  

NASA Astrophysics Data System (ADS)

This paper addresses the problem of estimating salinity for a large region in the Atlantic Ocean containing the Gulf Stream and its recirculation. Together with Part 1 [Thacker, W.C., 2007-this issue. Estimating salinity to complement observed temperature: 1. Gulf of Mexico. Journal of Marine Systems. doi:10.1016/j.jmarsys.2005.06.008.] dealing with the Gulf of Mexico, this reports on the first efforts of a project for developing world-wide capability for estimating salinity to complement expendable-bathythermograph (XBT) data. Such estimates are particularly important for this region, where the strong frontal contrasts render the task of assimilating XBT data into numerical models more sensitive to the treatment of salinity. Differences in salinity's co-variability with temperature and with longitude, latitude, and day-of-year from the northwestern part of the region with the Gulf Stream to the southeastern part more characteristic of the Sargasso sea suggested that the region be partitioned to achieve more accurate salinity estimates. In general, accuracies were better in the southeastern sub-region than in the more highly variable northwestern sub-region with root-mean-square estimation errors of 0.15 psu at 25 dbar and 0.02 psu at 300 dbar as compared with 0.35 psu and 0.50 psu, respectively, but in the southeast there was an unexpected error maximum around 1000 dbar where estimates were slightly less accurate than in the northwest. For pressures greater than 1400 dbar root-mean-square errors in both sub-regions were less than 0.02 psu.

Thacker, W. C.; Sindlinger, L.

2007-03-01

216

Isotopic evidence of pollutant lead sources in Northwestern France  

NASA Astrophysics Data System (ADS)

Ratios of stable lead isotopes ( 204Pb, 206Pb, 207Pb, 208Pb) are used to characterize both spatial and temporal variations in anthropogenic emissions of industrial lead aerosols to the atmosphere of northwestern France. Differences in isotopic compositions of aerosols collected from a rural area (Wimereux) in the Nord-Pas de Calais region along the English Channel in 1982-1983 ( 206Pb/ 207Pb=1.108±0.005) and 1994 ( 206Pb/ 207Pb=1.148±0.003) are paralleled by similar variations in urban aerosols within France during the same period (e.g., 206Pb/ 207Pb=1.115±0.008 from 1981-1989 and 1.143±0.006 from 1992-1995). These results correlate well with recent findings in the Mediterranean basin (Alleman, 1997) where this radiogenicity increase is clearly associated with industrial sources other than leaded gasoline that has remained relatively constant during its phasing out ( 206Pb/ 207Pb=1.08-1.11). Here we used archived data, air mass trajectories and aerosol diameters combined with isotopic signatures to confirm this trend at a regional scale. Indeed, the main industrial signatures from lead smelting ( 206Pb/ 207Pb=1.133±0.001) and steel metallurgy ( 206Pb/ 207Pb=1.196±0.015) in northwestern France appear more radiogenic than that of leaded gasoline. The shift in isotopic compositions also conform with the systematic change in the mean size (diameter) of aerosols at Wimereux, which ranged from 0.30 to 0.61 ?m in 1982-1984 and from 0.70 to 0.89 ?m in 1994.

Véron, Alain; Flament, Pascal; Bertho, Marie Laure; Alleman, Laurent; Flegal, Russell; Hamelin, Bruno

217

Paleomagnetism of late paleozoic rocks in the Tianshan, northwestern China  

NASA Astrophysics Data System (ADS)

A paleomagnetic study of late Paleozoic rocks in two areas of northwestern China helps to constrain the timing of collision between Tarim and the Junggar part of Eurasia along Tianshan. A primary Late Permian direction (D/I=198/-59, K=24, A95=12.6) is deirved from seven sites (53 samples) from the Heavenly Lake (Tianzhi) section in northern Tianshan that has both normal and reversed polarities and passes a fold test at the 99% confidence level. This result gives a latitude of 39°N in the Late Permian for southern Junggar. Twenty-two sites (144 samples) from the Devonian and Caroniferous rocks across Tianshan reveal postfolding remagnetizations some of which are interpreted as being acquired in the Permian due to the Tarim-Eurasia collision. The Late Permian paleomagnetic pole from the Heavenly Lake section is statistically indistinguishable from three published Late Permian poles from Tarim indicating closure of the Tianshan ocean and suturing of Tarim and Junggar before that time. These apelomagnetic poles from northwestern China are, however, significantly different from those of stable Eurasia, suggesting substantial later relative motion that can be partly accounted for by the progressive closure of the Mongolo-Okhotsk ocean and associated tectonic rotations. The absence of a discernable Permian ocean record west of the Khangay highland in central Mongolia requires that the rotations be accomodated within a diffusive plate boundary in the Eurasian continent. A Late Permian continental plate reconstruction is presented that takes into consideration these new paleomagnetic results and other geological constraints.

Shangyou, Nie; Rowley, David B.; Van der Voo, Rob; Maosong, Li

218

Structure and chemistry in the northwestern condensation of the Serpens molecular cloud core  

NASA Technical Reports Server (NTRS)

We present single-dish and interferometric observations of gas and dust in the core of the Serpens molecular cloud, focusing on the northwestern condensation. Single-dish molecular line observations are used to probe the structure and chemistry of the condensation while high-resolution images of CS and CH30H are combined with continuum observations from lambda = 1.3 mm to lambda = 3.5 cm to study the subcondensations and overall distribution of dust. For the northwestern condensation, we derive a characteristic density of 3 x 10(exp 5)/ cu cm and an estimated total mass of approximately 70 solar mass. We find compact molecular emission associated with the far-infrared source S68 FIRS 1, and with a newly detected subcondensation named S68 N. Comparison of the large-and small-scale emission reveals that most of the material in the northwest condensation is not directly associated with these compact sources, suggesting a youthful age for this region. CO J = 1 approaches 0 observations indicate widespread outflow activity. However, no unique association of embedded objects with outflows is possible with our observations. The SiO emission is found to be extended with the overall emission centered about S68 FIRS 1; the offset of the peak emission from all of the known continuum sources and the coincidence between the blueshifted SiO emission and blueshifted high-velocity gas traced by CO and CS is consistent with formation of SiO in shocks. Derived abundances of CO and HCO(+) are consistent with quiescent and other star-forming regions while CS, HCN, and H2CO abundances indicate mild depletions within the condensation. Spectral energy distribution fits to S68 FIRS 1 indicate a modest luminosity (50-60 solar luminosity), implying that it is a low-mass (0.5-3 solar mass) young stellar object. Radio continuum observations of the triple source toward S68 FIRS 1 indicate that the lobe emission is varying on timescales less than or equal to 1 yr while the central component is relatively constant over approximately 14 yr. The nature of a newly detected compact emission region, S68 N, is less certain due to the absence of firm continuum detections; based on its low luminosity (less than 5 solar luminosity) and strong molecular emission, S68 N may be prestellar subcondensation of gas and dust.

Mcmullin, Joseph P.; Mundy, Lee G.; Wilking, Bruce A.; Hezel, T.; Blake, Geoff A.

1994-01-01

219

The Idaho cobalt belt, northwestern United States — A metamorphosed Proterozoic exhalative ore district  

NASA Astrophysics Data System (ADS)

In the Idaho cobalt belt, originally exhalative, stratiform mineralization within the Proterozoic Yellow-jacket Formation has become increasingly coarse-grained and remobilized toward the northwest in the direction of increasing regional metamorphic grade. The Idaho cobalt belt is located about 40 km west of Salmon, Idaho in the northwestern United States. The most important deposit in the district is the Blackbird mine which produced copper-cobalt ore sporadically from the early 1900's until about 1960. The Iron Creek deposit at the southeast end of the belt has undergone greenschist fades, biotite zone metamorphism; zones of disseminated, veinlet and massive sulfides lie more or less parallel to bedding of quartzites and phyllites. The main ore minerals are chalcopyrite and cobaltiferous pyrite. Toward the northwest at the Blackpine mine, remobilization has concentrated most of the mineralization into relatively thin concordant and discordant veins containing chalcopyrite, pyrite and arsenopyrite. The cobalt is reported to occur within arsenopyrite. Further northwest at the Blackbird mine where the Yellowjacket formation has been metamorphosed to the lower amphibolite facies, zones of disseminated and coarse-grained vein ores lie approximately along the same stratigraphic zone. Chalcopyrite, cobaltite, arsenopyrite, pyrite and pyrrhotite are the dominant ore minerals. Up to 0.22 oz. Au/ton was present in some of the ore. In addition, tourmaline-bearing sedimentary rocks (tourmalinites) are associated with some of the Blackbird ores. The Salmon Canyon deposit at the northwest end of the belt has undergone upper amphibolite facies, sillimanite zone metamorphism. In these garnet-sillimanite gneisses, chalcopyrite is found as coarse blebs and cobaltite as large porphyroblastic crystals. Gold occurs in amounts up to 0.02 oz. Au/ton. Elsewhere in the world the two most similar districts are the cobalt-bearing portion of the Zambian-Zairian Copperbelt of central Africa where Proterozoic Roan sedimentary rocks contain stratiform copper-cobalt ore-bodies over a distance of more than 500 kilometers, and the Sheep Creek district of Meagher County, Montana, which contains strata-bound copper-cobalt mineralization. The Idaho cobalt belt is a strata-bound copper-cobalt district hosted by the Proterozoic Yellowjacket Formation and located in east-central Idaho within Lemhi County, approximately 40 kilometers west of Salmon, Idaho, northwestern United States (Fig. 1). Of the four main deposits described here (from southeast to northwest, the Iron Creek, Blackpine, Blackbird, and the Salmon Canyon deposits), the Blackbird mine is the most important in the district. It was discovered in 1893 and sporadically produced copper and cobalt until about 1960. The Yellowjacket Formation has undergone an increasing degree of metamorphism toward the northwest. The deposits are largely strata-bound in a belt over 50 km in length, strongly suggesting a syngenetic mode of origin. However, the proximity of the district to satellitic granitic plutons of the Idaho batholith has prompted many investigators to suggest an epigenetic hydrothermal origin (Anderson 1947 and Purdue 1975). Remobilization of some of the mineralization into veins at the Blackbird mine, where most of the previous work has been concentrated, has also suggested an epigenetic origin. A more district-wide view of the mineralization points to a strong degree of stratigraphic control.

Nold, J. L.

1990-07-01

220

Evidence for bimodal hybrid zones between two species of char (Pisces: Salvelinus) in northwestern North America  

E-print Network

) and bull trout (Salvelinus confluentus) have widely overlapping, but largely parapatric ranges in waterEvidence for bimodal hybrid zones between two species of char (Pisces: Salvelinus) in northwestern; reproductive isolation; salmonidae; speciation. Abstract Dolly Varden (Salvelinus malma, Pisces: Salmonidae

Taylor, Eric B. "Rick"

221

[High energy physics research]: Annual performance report, December 1, 1991--November 30, 1992. [Northwestern Univ  

SciTech Connect

The various segments of the Northwestern University high energy physics research program are reviewed. Work is centered around experimental studies done primarily at FNAL; associated theoretical efforts are included.

Rosen, J.; Block, M.; Buchholz, D.; Gobbi, B.; Schellman, H.; Buchholz, D.; Rosen, J.; Miller, D.; Braaten, E; Chang, D; Oakes, R.; Schellman, H.

1992-01-01

222

Northwestern University Archives Evanston, Illinois EVA REYNOLDS (1885-?) SCRAPBOOK, 1905-1908  

E-print Network

Cottage). Reynolds was a member of the Women's Union and attended Young Women's Christian Association of a commercially produced scrapbook, she used a book of printed photographs entitled An Art Souvenir: Northwestern

223

Topographically controlled grassland soils in the Boreal Cordillera ecozone, northwestern Canada  

E-print Network

Topographically controlled grassland soils in the Boreal Cordillera ecozone, northwestern Canada 2009, accepted 16 October 2009. Sanborn, P. 2010. Topographically controlled grassland soils relationships of grassland soils were examined at three widely separated sites (Stikine River Valley, British

Sanborn, Paul

224

Overwintering Physiology and Hibernacula Microclimates of Blanchard's Cricket Frogs at Their Northwestern Range Boundary  

E-print Network

Overwintering Physiology and Hibernacula Microclimates of Blanchard's Cricket Frogs at Their Northwestern Range Boundary David L. Swanson1 and Seth L. Burdick1 Blanchard's Cricket Frogs (Acris crepitans freezing tolerance, glucose mobilization during freezing, and hibernacula microclimates of cricket frogs

Swanson, David L.

225

NORTHWESTERN UNIVERSITY Automated Monitoring and Inverse Analysis of a Deep Excavation in Seattle  

E-print Network

NORTHWESTERN UNIVERSITY Automated Monitoring and Inverse Analysis of a Deep Excavation in Seattle #12;ii ABSTRACT Automated Monitoring and Inverse Analysis of a Deep Excavation in Seattle Miltiadis Langousis Performance monitoring of deep excavations typically includes slope inclinometers, optical

226

RESOURCES FOR DOCTORAL STUDENTS AT NORTHWESTERN UNIVERSITY Student advising on Evanston and Chicago campuses  

E-print Network

Center for Teaching Excellence workshops and resources · Services for Students with Disabilities and financial accommodations for eligible students · Graduate student community space · Chicago Transit RESOURCES FOR DOCTORAL STUDENTS AT NORTHWESTERN UNIVERSITY ACADEMIC · Student advising

Amaral, Luis A.N.

227

Title: Biologically Inspired MEMS Sensors for Medical Applications Professor Chang Liu, Northwestern University  

E-print Network

Title: Biologically Inspired MEMS Sensors for Medical Applications Professor Chang Liu, Northwestern University Abstract: Today's engineering systems, such as machines, vehicles, robots, medical devices, home appliances and entertainment devices, are often sensor deficient. Biological systems

Van Veen, Barry D.

228

ATMOSPHERIC VOLATILE HYDROCARBON COMPOSITION AT FIVE REMOTE SITES IN NORTHWESTERN NORTH CAROLINA  

EPA Science Inventory

The results of a study to measure the volatile hydrocarbon composition of the atmosphere at several sites in the southern Appalachian Mountains of northwestern North Carolina are presented. Ambient air was sampled repeatedly at five geographically and botanically different remote...

229

Interim Summary: Nesting Counts of Ospreys and Brown Pelicans in Northwestern Mexico, 2006.  

National Technical Information Service (NTIS)

The distribution and abundance of nesting populations of California brown pelicans (Pelecanus occidentalis californicus) and ospreys (Pandion haliaetus) were documented in 2006 in northwestern Mexico. For ospreys only, the 2006 data were compared to popul...

C. J. Henny, D. W. Anderson

2007-01-01

230

NOTIS-3 (Northwestern On-Line Total Integrated System): Technical Services Applications.  

ERIC Educational Resources Information Center

Northwestern University Library's locally developed automated support system, NOTIS, operational since 1970-71, is described in terms of its technical services aspects. Internal applications and relevance to projected national networking developments are considered. (Author)

Horny, Karen L.

1978-01-01

231

Geographic Patterns for Foraging Dispersion of Hawaiian Monk Seals ('Monachus schauinslandi') in the Northwestern Hawaiian Islands.  

National Technical Information Service (NTIS)

Hawaiian monk seals (Monachus schauinslandi) are endemic to the Hawaiian Island Archipelago with most of the metapopulation living at six relatively remote atolls and islands in the Northwestern Hawaiian Islands, though increasing numbers of seals and bir...

B. S. Stewart

2004-01-01

232

Chromosomal variation in Peromyscus Maniculatus from Northcentral and Northwestern United States  

E-print Network

CHROMOSOMAL VARIATION IN PEROMYSCUS MAN ICULATUS FROM NORTHCENTRAL AND NORTHWESTERN UNITED STATES A Thesis by KATHLEEN PATRICIA FUXA Submitted to the Graduate College of Texas ASM University in partial fulfillment of the reqirements... for the degree of MASTER OF SCIENCE May 1985 Major Subject: Zoology CHROMOSOMAL VARIATION IN PEROMYSCUS MAN ICULATUS FROM NORTHCENTRAL AND NORTHWESTERN UNITED STATES A Thesis by KATHLEEN PATRICIA FUXA Approved as to style and content by: ra F. (Chair a...

Fuxa, Kathleen Patricia

2012-06-07

233

Tycoons and contraband: informal cross-border trade in West Nile, north-western Uganda  

Microsoft Academic Search

This article presents ethnographic evidence on the activities of the “tycoons” – large-scale cross-border contraband traders in north-western Uganda. It shows how engagement with state officials, but also integration in the broader community are two crucial aspects which explain the functioning of informal cross-border trade or “smuggling” in north-western Uganda. In doing so, it shows how, although there is a

Kristof Titeca

2012-01-01

234

A volumetric temperature-salinity census for the continental shelf of the northwestern Gulf of Mexico  

E-print Network

A VOLUMETRIC TEMPERATURE-SALINITY CENSUS FOR THE CONTINENTAL SHELF OF THE NORTHWESTERN GULF OF MEXICO A Thesis by WILLIAM FRANCIS ULM Submitted to the Graduate College of Texas A&M University in partxal fulfillment of the requirements... for the degree of MASTER OF SCIENCE December 19B3 Major Subject: Oceanography A VOLUMETRIC TEMPERATURE-SALINITY CENSUS FOR THE CONTINENTAL SHELF OF THE NORTHWESTERN GULF OF MEXICO A Thesis by WILLIAM FRANCIS ULM Approved as to style and content by: John...

Ulm, William Francis

2012-06-07

235

Life-history traits and potential invasiveness of introduced pumpkinseed Lepomis gibbosus populations in northwestern Europe  

Microsoft Academic Search

To evaluate the potential invasiveness of pumpkinseed Lepomis gibbosus introduced to northwestern European inland waters, growth and reproduction traits were examined in ten populations along\\u000a a trajectory spanning northwestern Europe (Norway, England, Holland, Belgium and France) and evaluated in light of published\\u000a dataset from Europe. In the 848 pumpkinseed captured, maximum age was 3–4 years, with a sex ratio near unity

Julien Cucherousset; Gordon H. Copp; Michael G. Fox; Erik Sterud; Hein H. van Kleef; Hugo Verreycken; Eva Záhorská

2009-01-01

236

A diminutive pelecinid wasp from the Eocene Kishenehn Formation of northwestern Montana (Hymenoptera: Pelecinidae)  

E-print Network

. tubuliforme in middle Eocene Baltic amber (Brues, 1933; Engel, 2002) and a frag- mentary specimen in Paleocene amber from Sakhalin Island (Johnson, 1998). Here we describe a second Paleogene fossil of Pelecinidae based on a single male collected from...

Greenwalt, Dale; Engel, Michael S.

2014-07-01

237

Biogeomorphic processes and archaeological site formation in Absaroka Mountains of northwestern Wyoming.  

E-print Network

??Archaeologists frequently associate Thomomys talpoides, the Northern Pocket Gopher, with the loss of stratigraphic integrity (Bocek 1986; Morin 2006). Disturbance from subsurface burrowing and the… (more)

Bechberger, Jillian M.

2010-01-01

238

Brittle tectonics within the Jurassic formations of the Ouarsenis culminating area, northwestern Algeria  

NASA Astrophysics Data System (ADS)

Brittle structures within the Ouarsenis culminating zone were studied in order to characterize the polyphased tectonics. Field observations revealed that the dominant structures are highly tilted. They are represented by faults and joints, shears, reverse or curvilinear, locally associated with gypsum intrusions. Field data analysis shows that large scale shear faults are localized within the limits of the structural entities. Two main tectonic phases, having affected the Ouarsenis culminating zone were identified: (i) A NW-SE oriented compressive phase, represented by the contacts marked out by in-depth reverse faults and folding, mainly located in the westernmost part of Sra Abdelkader, Rokba Atba and in the western part of Batha, Fartas and Belkeiret (thrusts), respectively. This phase was also identified in reverse and sinistral faulting within Sidi Djber at the easternmost part of Sra Abdelkader, and the Grand Pic and the southern massif of Belkheiret respectively. (ii) A NNE-SSW oriented compressive phase, characterized by dextral strike-slips, is located in the easternmost part of Sra Abdelkader and Rokba Atba. North of the Grand Pic, a sinistral ?N120° oriented shearing occurred, with a lateral slip reaching ?2 km. The examination and the data analysis show a major N110-120° oriented fault with a sinistral signature. This movement would be responsible for block rotations and tilts. Counterclockwise rotations of the paleostress of ?38° and ?43° from west to east of the Sra Abdelkader massif and from Belkeiret to Batha, Fartas blocks were recorded, respectively. This local change of the stress field is mainly due to a deformation controlled by the regional post-Miocene geodynamic system, possibly explained by the proposed model.

Aïfa, Tahar; Zaagane, Mansour

2014-08-01

239

The carbon-isotopic composition of Proterozoic carbonates: Riphean successions from northwestern Siberia (Anabar Massif, Turukhansk Uplift)  

NASA Technical Reports Server (NTRS)

Thick carbonate-dominated successions in northwestern Siberia document secular variations in the C-isotopic composition of seawater through Mesoproterozoic and early Neoproterozoic (Early to early Late Riphean) time. Mesoproterozoic dolomites of the Billyakh Group, Anabar Massif, have delta 13C values that fall between 0 and -1.9 permil versus PDB, with values in the upper part of the succession (Yusmastakh Formation) consistently higher than those of the lower (Ust'-Il'ya and Kotuikan formations). Consistent with available biostratigraphic and radiometric data, delta 13C values for Billyakh carbonates compare closely with those characterizing early Mesoproterozoic carbonates (about 1600-1200 Ma) worldwide. In contrast, late Mesoproterozoic to early Neoproterozoic limestones and dolomites in the Turukhansk Uplift exhibit moderate levels of secular variation. Only the lowermost carbonates in the Turukhansk succession (Linok Formation) have delta 13C values that approximate Billyakh values. Higher in the Turukhansk succession, delta 13C values vary from -2.7 to +4.6 permil (with outliers as low as -5.0 permil interpreted as diagentically altered). Again, consistent with paleontological and radiometric data, these values compare well with isotopic values from 1200 to 850 Ma successions elsewhere. Five sections measured in different parts of the Turukhansk basin show nearly identical patterns of variation, confirming that carbonate delta 13C correlates primarily with time and not facies. The Siberian sections illustrate the potential of integrated biostratigraphic and chemostratigraphic data in the intra- and interbasinal correlation of Mesoproterozoic and early Neoproterozoic rocks.

Knoll, A. H.; Kaufman, A. J.; Semikhatov, M. A.

1995-01-01

240

Reservoir Model of the Jacksonburg-Stringtown Oil Field; Northwestern West Virginia: Potential for Miscible Carbon Dioxide Enhanced Oil Recovery  

NASA Astrophysics Data System (ADS)

Located in northwestern West Virginia, the Jacksonburg-Stringtown field has produced over 22 million barrels of oil (MMBO) since its discovery in 1895. The primary producing interval within the field is the Late Devonian Gordon Stray. Log analysis shows this formation to represent an estuarine depositional system. Four subunits within the formation are defined based on depositional framework: barrier sand, central bay shale, estuarine channels, and fluvial channel subunits. RHOmaa/Umaa lithological composition plots support the conclusion of a marine-influenced estuarine depositional framework. Structural and isopach maps generated with data from 73 local wells reveal a northeast-southwest trending sand deposit of 15-35 foot thickness, which is interpreted as the depocenter for the incised valley of the Gordon Stray. Analysis of formation horizon maps shows that the reservoir is synclinal and, as a result, contains a stratigraphic trap as opposed to the more common structural traps found in the immediate area. Porosity and pore-feet distribution maps indicate high porosity regions in southern regions of the field and high pore volume in northern areas. A miscible CO2 flood model estimates that an additional 7.3 MMBO could be recovered from the high porosity regions in the southern half of the field. The Jacksonburg-Stringtown field is well-suited for enhanced oil recovery and/or geologic CO2 sequestration.

Bergerud, Blake

241

Hydrogeologic framework of the Maku area basalts, northwestern Iran  

NASA Astrophysics Data System (ADS)

The Maku area in northwestern Iran is characterized by young lava flows which erupted from Mount Ararat in Turkey. These fractured volcanic rocks overlie alluvium associated with pre-existing rivers and form a good basalt-alluvium aquifer over an area of 650 km2. Groundwater discharge occurs from 12 large springs, ranging from 20 to 4,000 L s-1, and from some extraction wells. Permian and Oligo-Miocene age limestones along the northern boundary of the Bazargan and Poldasht Plains basalts are intensively karstified and groundwater from these high lands easily enters the basalt-alluvium aquifers. The transmissivity of the basalt-alluvium aquifer ranges from 24 to 870 m2 d-1, indicating heterogeneity. Groundwater of the aquifer is a sodium-bicarbonate and mixed cation-bicarbonate type and the concentration of fluoride is higher than the universal maximum admissible concentrations for drinking. In order to determine the chemical composition and identify the source of the high fluoride concentrations in the groundwater of the basaltic area, water samples from the springs, wells and rivers were analyzed. The results indicate that the high fluoride water enters the study area from the Sari Su River.

Asghari Moghaddam, Asghar; Fijani, Elham

2009-06-01

242

Northwestern song sparrow populations show genetic effects of sequential colonization.  

PubMed

Two genetic consequences are often considered evidence of a founder effect: substantial loss in genetic diversity and rapid divergence between source and founder populations. Single-step founder events have been studied for these effects, but with mixed results, causing continued controversy over the role of founder events in divergence. Experiments of serial bottlenecks have shown losses of diversity, increased divergence, and rapid behavioural changes possibly leading to reproductive isolation between source and final populations. The few studies conducted on natural, sequentially founded systems show some evidence of these effects. We examined a natural vertebrate system of sequential colonization among northwestern song sparrows (Melospiza melodia). This system has an effectively linear distribution, it was probably colonized within the last 10,000 years, there are morphological and behavioural differences among populations, and the westernmost populations occur in atypical habitats for the species. Eight microsatellite loci from eight populations in Alaska and British Columbia (n = 205) showed stepwise loss of genetic diversity, genetic evidence for strong population bottlenecks, and increased population divergence. The endpoint population on Attu Island has extremely low diversity (H(E) = 0.18). Our study shows that sequential bottlenecks or founder events can have powerful genetic effects in reducing diversity, possibly leading to rapid evolutionary divergence. PMID:15813781

Pruett, Christin L; Winker, Kevin

2005-04-01

243

Geomorphic surfaces in the northwestern Klamath Mountains, California and Oregon  

SciTech Connect

Thick, residual, colluvial and alluvial soils derived from ophiolitic rocks mantle at least four geomorphic surfaces in the Siskiyou and marble mountains, in northwestern California and Illinois Valley, in southwestern Oregon. Analysis of digital elevation data provides constraints on the distribution and origin of these surfaces. Because of the geomorphic expression and soil mechanical properties of the surfaces, a map of slope gradients less than 22 degrees closely approximates the distribution of geomorphic surfaces as they are known from field observations. Preliminary definition of individual surfaces is based upon classification of the slop-map by elevation ranges. The Klamath Peneplain'' of Diller (1902) and associated soils, recently referred to as Klamath Saprolite'', are recognized near summit elevation (1,500 meters) across the area. Regional uplift and erosion has resulted in extensive, large earthflow landslides derived from these soils. Alluvial and residual deposits on the floor of the Illinois Valley occur at the same elevation (300 meters) as incised alluvial and colluvial terrace deposits along the Klamath River and tributary streams. At least two additional surfaces have been identified in the Siskiyou and Marble Mountains at approximately elevation 750 and 1,000 meters. Analysis of digital elevation data, combined with the map of earthflow landslides, allows rapid preliminary mapping of geomorphic surfaces in this terrain.

Baldwin, K.S. (Forest Service, Happy Camp, CA (United States)); Ricks, C.L. (Forest Service, Gold Beach, OR (United States))

1993-04-01

244

Drought induces spruce beetle (Dendroctonus rufipennis) outbreaks across northwestern Colorado.  

PubMed

This study examines influences of climate variability on spruce beetle (Dendroctonus rufipennis) outbreak across northwestern Colorado during the period 1650 2011 CE. Periods of broad-scale outbreak reconstructed using documentary records and tree rings were dated to 1843-1860, 1882-1889, 1931-1957, and 2004-2010. Periods of outbreak were compared with seasonal temperature, precipitation, vapor pressure deficit (VPD), the Palmer Drought Severity Index (PDSI), and indices of ocean-atmosphere oscillation that include the El Niño Southern Oscillation (ENSO), Pacific Decadal Oscillation (PDO), and Atlantic Multidecadal Oscillation (AMO). Classification trees showed that outbreaks can be predicted most successfully from above average annual AMO values and above average summer VPD values, indicators of drought across Colorado. Notably, we find that spruce beetle outbreaks appear to be predicted best by interannual to multidecadal variability in drought, not by temperature alone. This finding may imply that spruce beetle outbreaks are triggered by decreases in host tree defenses, which are hypothesized to occur with drought stress. Given the persistence of the AMO, the shift to a positive AMO phase in the late 1990s is likely to promote continued spruce beetle disturbance. PMID:24933812

Hart, Sarah J; Veblen, Thomas T; Eisenhart, Karen S; Jarvis, Daniel; Kulakowski, Dominik

2014-04-01

245

Rangewide landscape genetics of an endemic Pacific northwestern salamander.  

PubMed

A species' genetic structure often varies in response to ecological and landscape processes that differ throughout the species' geographic range, yet landscape genetics studies are rarely spatially replicated. The Cope's giant salamander (Dicamptodon copei) is a neotenic, dispersal-limited amphibian with a restricted geographic range in the Pacific northwestern USA. We investigated which landscape factors affect D. copei gene flow in three regions spanning the species' range, which vary in climate, landcover and degree of anthropogenic disturbance. Least cost paths and Circuitscape resistance analyses revealed that gene flow patterns vary across the species' range, with unique combinations of landscape variables affecting gene flow in different regions. Populations in the northern coastal portions of the range had relatively high gene flow, largely facilitated by stream and river networks. Near the southeastern edge of the species' range, gene flow was more restricted overall, with relatively less facilitation by streams and more limitation by heat load index and fragmented forest cover. These results suggested that the landscape is more difficult for individuals to disperse through at the southeastern edge of the species' range, with terrestrial habitat desiccation factors becoming more limiting to gene flow. We suggest that caution be used when attempting to extrapolate landscape genetic models and conservation measures from one portion of a species' range to another. PMID:23293948

Trumbo, Daryl R; Spear, Stephen F; Baumsteiger, Jason; Storfer, Andrew

2013-03-01

246

Northwestern University Schizophrenia Data and Software Tool (NUSDAST).  

PubMed

The schizophrenia research community has invested substantial resources on collecting, managing and sharing large neuroimaging datasets. As part of this effort, our group has collected high resolution magnetic resonance (MR) datasets from individuals with schizophrenia, their non-psychotic siblings, healthy controls and their siblings. This effort has resulted in a growing resource, the Northwestern University Schizophrenia Data and Software Tool (NUSDAST), an NIH-funded data sharing project to stimulate new research. This resource resides on XNAT Central, and it contains neuroimaging (MR scans, landmarks and surface maps for deep subcortical structures, and FreeSurfer cortical parcellation and measurement data), cognitive (cognitive domain scores for crystallized intelligence, working memory, episodic memory, and executive function), clinical (demographic, sibling relationship, SAPS and SANS psychopathology), and genetic (20 polymorphisms) data, collected from more than 450 subjects, most with 2-year longitudinal follow-up. A neuroimaging mapping, analysis and visualization software tool, CAWorks, is also part of this resource. Moreover, in making our existing neuroimaging data along with the associated meta-data and computational tools publically accessible, we have established a web-based information retrieval portal that allows the user to efficiently search the collection. This research-ready dataset meaningfully combines neuroimaging data with other relevant information, and it can be used to help facilitate advancing neuroimaging research. It is our hope that this effort will help to overcome some of the commonly recognized technical barriers in advancing neuroimaging research such as lack of local organization and standard descriptions. PMID:24223551

Wang, Lei; Kogan, Alex; Cobia, Derin; Alpert, Kathryn; Kolasny, Anthony; Miller, Michael I; Marcus, Daniel

2013-01-01

247

The Relation between Seismicity and Active Faults in Northwestern Taiwan  

NASA Astrophysics Data System (ADS)

Northwestern Taiwan is a major economical, transportation and cultural center in our country. Geologically, this region is covered by red soil terraces. These terraces are displaced by several active faults. Seismicity reveals potential of strong ground motion in this region. We deploy a microearthquake network to locate the active faults in the region. The aim of our study is to find the characteristics of seismicity in the Taoyuan, Hsinchu, and Miaoli region, and the relation between seiemicity and active faults. The Central Weather Bureau (CWB) in Taiwan has deployed a short period seismic network in whole Taiwan. Many earthquakes were located by the CWB seismic network, but many small mircoearthquakes occurred in the local area can not be detected. Thus we deploy a temporary seismic network in the area since 2001. Ten stations were deployed. Each station includes an accelerograph with GPS and three component velocity-type sensors. The sampling rate is 200 points/sec. There are two ways to increase the accuracy of the earthquake location. One is to increase the seismic stations in the study area. The other way is to improve the location method. We locate the earthquakes by using the data of both CWB seismic network and our seismic network. The results show most earthquakes occurred in the mountain area in the southeast part of the seismic network. After we relocate the earthquakes, the focal depth changes significantly. Most focal depths are less than fifteen kilometers and become densely clustered.

Lee, C.; Tsai, Y.

2004-12-01

248

Northwestern University Schizophrenia Data and Software Tool (NUSDAST)  

PubMed Central

The schizophrenia research community has invested substantial resources on collecting, managing and sharing large neuroimaging datasets. As part of this effort, our group has collected high resolution magnetic resonance (MR) datasets from individuals with schizophrenia, their non-psychotic siblings, healthy controls and their siblings. This effort has resulted in a growing resource, the Northwestern University Schizophrenia Data and Software Tool (NUSDAST), an NIH-funded data sharing project to stimulate new research. This resource resides on XNAT Central, and it contains neuroimaging (MR scans, landmarks and surface maps for deep subcortical structures, and FreeSurfer cortical parcellation and measurement data), cognitive (cognitive domain scores for crystallized intelligence, working memory, episodic memory, and executive function), clinical (demographic, sibling relationship, SAPS and SANS psychopathology), and genetic (20 polymorphisms) data, collected from more than 450 subjects, most with 2-year longitudinal follow-up. A neuroimaging mapping, analysis and visualization software tool, CAWorks, is also part of this resource. Moreover, in making our existing neuroimaging data along with the associated meta-data and computational tools publically accessible, we have established a web-based information retrieval portal that allows the user to efficiently search the collection. This research-ready dataset meaningfully combines neuroimaging data with other relevant information, and it can be used to help facilitate advancing neuroimaging research. It is our hope that this effort will help to overcome some of the commonly recognized technical barriers in advancing neuroimaging research such as lack of local organization and standard descriptions. PMID:24223551

Wang, Lei; Kogan, Alex; Cobia, Derin; Alpert, Kathryn; Kolasny, Anthony; Miller, Michael I.; Marcus, Daniel

2013-01-01

249

Strain rates in northwestern Italy from spatially smoothed seismicity  

NASA Astrophysics Data System (ADS)

This work presents seismic strain rate maps for the Western Alps and Northern Apennines (northern Italy) as derived from an earthquake catalog collecting both historical and instrumental data. Strain rates are calculated on the basis of the rate of seismic moment release using the Anderson method. Unlike previous applications, which determined the total strain rate associated with specific seismogenic sources, we have employed an innovative zoneless approach based on a spatially smoothed seismicity method. In addition, a Monte Carlo simulation procedure is applied to allow for uncertainty in the input data (e.g., magnitude to moment conversion, seismogenic thickness, maximum earthquake magnitude). Strain rate maps are developed by summing the moments of the earthquakes reported in the catalog and by using two different earthquake recurrence relations. Our results indicate that deformation rates are quite high, ranging from about 2 to 12 × 10-9 yr-1 in the Northern Apennines and from 0.5 to 6 × 10-9 yr-1 in the Western Alps. These values, however, are ˜1 order less than those derived from Global Positioning System measurements, suggesting that a portion of the recent deformation in northwestern Italy is related to aseismic processes. The discrepancies between seismic and geodetic strain rates may also indicate that the record of seismicity may not provide a sufficient time window for assessment of secular rates of moment release (or secular deformation rates) and rates of recurrence of large magnitude earthquakes in the study area.

Barani, Simone; Scafidi, Davide; Eva, Claudio

2010-07-01

250

Caribbean basin framework, 4: Maracaibo basin, northwestern Venezuela  

SciTech Connect

The Maracaibo basin is presently located in a topographic depression on the Maracaibo block, a triangular, fault-bounded block within the Caribbean-South America plate boundary of northwestern Venezuela. Intense oil exploration over the last 50 years has produced a large amount of seismic and well data that can be used to constrain four Jurassic to Recent tectonic and depositional events that affected the region: (1). Late Jurassic rift phase and subsidence along normal faults striking north-northeast across the floor of the basin; (2) Cretaceous to early Eocene subsidence recorded by shallow to deep marine carbonate and clastic rocks that thicken from south to north and completely cover Permian rocks of the Merida arch; (3) Eocene folding, thrusting, and initial reactivation of Jurassic normal faults as convergent strike-slip and reverse faults. Eocene clastic sediments are thickest in a narrow northwest-trending foredeep on the northeastern margin of the basin; (4) Late Miocene to Recent northwest-southeast convergence is marked by continued reactivation of Jurassic normal faults as reverse and left-lateral strike-slip faults, uplift of mountain ranges bordering the basin, and deposition of up to 10 km of clastic sediment.

Lugo, J. (Univ. of Texas, Austin (United States))

1991-03-01

251

Antimicrobial activity of Northwestern Mexican plants against Helicobacter pylori.  

PubMed

Helicobacter pylori is the major etiologic agent of such gastric disorders as chronic active gastritis and gastric carcinoma. Over the past few years, the appearance of antibiotic-resistant bacteria has led to the development of better treatments, such as the use of natural products. This study evaluated the anti-H. pylori activity of 17 Mexican plants used mainly in the northwestern part of Mexico (Sonora) for the empirical treatment of gastrointestinal disorders. The anti-H. pylori activity of methanolic extracts of the plants was determined by using the broth microdilution method. The 50% minimum inhibitory concentrations ranged from less than 200 to 400 ?g/mL for Castella tortuosa, Amphipterygium adstringens, Ibervillea sonorae, Pscalium decompositum, Krameria erecta, Selaginella lepidophylla, Pimpinella anisum, Marrubium vulgare, Ambrosia confertiflora, and Couterea latiflora and were greater than 800??g/mL for Byophyllum pinnatum, Tecoma stans linnaeus, Kohleria deppena, Jatropha cuneata, Chenopodium ambrosoides, and Taxodium macronatum. Only Equisetum gigantum showed no activity against H. pylori. This study suggests the important role that these plants may have in the treatment of gastrointestinal disorders caused by H. pylori. The findings set the groundwork for further characterization and elucidation of the active compounds responsible for such activity. PMID:21663492

Robles-Zepeda, Ramón E; Velázquez-Contreras, Carlos A; Garibay-Escobar, Adriana; Gálvez-Ruiz, Juan C; Ruiz-Bustos, Eduardo

2011-10-01

252

Missing shortening in the thick-skinned retroarc thrust belt of the central Andes, northwestern Argentina, ~25°S  

NASA Astrophysics Data System (ADS)

A very large discrepancy exists among estimated retroarc shortening magnitudes in the thin-skinned thrust belt of Bolivia and the thick-skinned thrust belt of northwestern Argentina. Fieldwork and structural analysis from this study at ~25°S latitude in northwestern Argentina confirm the presence of a mainly west verging, thick-skinned style of shortening in the region which, taken together with thermochronological data ((U-Th)/He in zircon and apatite and published apatite fission track results), imply up to 10 km of rapid, Miocene exhumation. Although these results suggest that significant exhumation occurred in the region, displacements on mapped, discrete faults are insufficient in magnitude (by ~15-20%) to generate the observed ~58 km thick crust (Yuan et al., 2002). We suggest that additional, unrecognized shortening or crustal addition is required in the region to explain the thick crust and occurred by 1) crustal flow from neighboring regions of thickened crust; 2) passive roof thrusting whereby major, likely mid-crustal shortening was fed to higher structural levels; 3) tectonic underplating of trench or forearc rocks; and/or 4) significant penetrative strain not accommodated by through going faults. We do not discard other mechanisms of crustal thickening and/or addition in the region, but magnitudes of upper crustal shortening required by excess area calculations are best explained by penetrative deformation within rheologically weak metaturbidites of the Neoproterozoic to Cambrian Puncoviscana Formation. Although penetrative strain was generally not considered in cross section restorations in the retroarc of Bolivia, a relative lack of these rheologically weak rocks there probably precludes penetrative deformation as a significant mode of deformation and may partially reconcile the discrepancy in along-strike shortening magnitudes. Significant shortening has been accommodated by penetrative strain in other orogens worldwide, including western North America (e.g., Mitra, 1994; Duebendorfer and Meyer, 2002) and southwestern China (e.g., Burchfiel et al., 2007), and may reflect an often overlooked yet fundamental style of crustal deformation.

Pearson, D. M.; Kapp, P. A.; Decelles, P. G.; Reiners, P. W.

2010-12-01

253

Community Problems in Eight Northwestern Counties. Report No. 1 of a Series on Quality of Life and Development in Northwestern Wisconsin, January 1976.  

ERIC Educational Resources Information Center

As part of a study of the quality of life in northwestern Wisconsin, questions re: important problems, public services, and environmental concerns were asked of a sample of 150 people in each of 5 counties (Bayfield, Douglas, Price, Taylor, and Washburn) in 1974. Responses to similar questions asked in a 1973 study of Ashland, Burnett, and Rusk…

Lambert, Virginia

254

Origin and microfossils of the oil shale of the Green River formation of Colorado and Utah  

Microsoft Academic Search

The Green River formation of Colorado and Utah is a series of lakebeds of middle Eocene age that occupy two broad, shallow, simple, structural basins--the Piceance Creek basin in northwestern Colorado and the Uinta basin in northeastern Utah. The ancient lakes served as a basin for the accumulation of tremendous quantities of aquatic organisms. The predominance of microscopic fresh-water algae

1931-01-01

255

Proterocara argentina, a new fossil cichlid from the Lumbrera Formation, Eocene of Argentina  

Microsoft Academic Search

The Lumbrera Formation is the uppermost unit of the Santa Bárbara Subgroup of the Salta Group, exposed in northwestern Argentina. It consists of fine clastic sediments of characteristic brick red color with an intercalation of green mudstone levels, which are called Faja Verde. The specimen described here was collected from the middle part of the Faja Verde II at the

Maria C. Malabarba; Oscar Zuleta; Cecilia Del Papa

2006-01-01

256

Subduction of the Eastern Panama Basin and seismotectonics of northwestern South America  

NASA Astrophysics Data System (ADS)

Spreading along the Cocos-Nazca plate boundary since the breakup of the Farallon plate in the Miocene has resulted in the formation of the Panama basin and a complex interaction of plates in and near northwestern South America. Current plate boundaries have been defined, and segments of subducted lithosphere identified through selection of hypocentral locations of earthquakes, considering only well-located events, and through focal mechanism determinations. The existence of relict plate boundaries, bathymetric features, and the Panamanian isthmus has affected the subduction process of the Nazca plate beneath South America and determined the present-day configuration of the subducting lithospheric plate. There is no single triple junction separating the Caribbean, South American, and Nazca plates. Instead, the Panamanian isthmus and surrounding areas are accommodating east-west compression (and a lesser degree of north-south compression) along a series of thrust faults striking NW to NE, and the Andean ranges of Ecuador, Colombia, and Venezeula are moving as a block NNE relative to the rest of the South American plates, along a system of faults following the front of the Eastern Cordillera. The subducted portions of the Panama basin and old Farallon plate have become segmented into three pieces recognized in this study. From north to south, they are (1) a `Bucaramanga' segment continuous with the Caribbean seafloor northwest of Colombia, (2) a `Cauca' segment continuous with oceanic crust (Nazca plate) currently being subducted beneath South America at the Colombia-Ecuador trench, and (3) an `Ecuador' segment at the northern end of the subducted lithospheric plate which is dipping at a small angle to the east beneath northern Peru. The segmentation of the subducted plate can be explained by the buoyancy of bathymetric features which have been partially subducted.

Pennington, Wayne D.

1981-11-01

257

Evolutionary models of structural transfer zone in onshore and offshore areas, northwestern Taiwan  

NASA Astrophysics Data System (ADS)

Structural transfer zones in the frontal part of a fold-and-thrust belt mark the end of segments of major thrusts and represent the lateral variation in magnitude of displacement, slip direction and style of fault-related structure. On the other hand, in the frontal part of a fold-and-thrust belt of in-sequence and ongoing development, all fault-related structures represent the initial features of the following structural evolution. During the latest stage of the Penglai orogeny in northwestern Taiwan, two sets of fault system developed separately as a series of NW-SE fold-thrust belts and E-W high-angle thrusts. In this study, we demonstrate three evolutionary models of structural transfer zone during the initial stage of different thrust development, in-sequence development of thrust-related folding, interaction between normal fault reactivation and in-sequence development of thrusts, and normal fault reactivation resulting in the inversion structures. We use a grid of seismic profile and well bore data to interpret subsurface structural geometry, build a three-dimensional structural mode, and integrate trishear modeling to analyze the structural evolution. On the whole, three types of structural transfer zone can be identified based on their distinct development: 1. formation of the structural transfer zones in the inversion tectonic belt were controlled by the arrangement and linkage of early normal faults; 2. the continuity of fold geometry was first influenced by lateral variation in dip angle of low-angle thrust and in turn broken by high-angle transcurrent faulting, forming segmented fold structures during the late compression; and 3. slip along two parallel thrusts with opposite vergence and decreasing dip angle toward the transfer zone formed complex fault-related folds. The variation of P/S ratio along the strike of some thrusts also plays important role in shaping the features of the transfer zone.

Yang, Kenn Ming; Hsieh, Ching Yun; Iuan Chung, Bo; Ben Wang, Jar; Ting, Hsin Hsiu; Chuang, Hui Ju; Jie Lee, Chang

2014-05-01

258

Clastic dikes of Heart Mountain fault breccia, northwestern Wyoming, and their significance  

USGS Publications Warehouse

Structural features in northwestern Wyoming indicate that the Heart Mountain fault movement was an extremely rapid, cataclysmic event that created a large volume of carbonate fault breccia derived entirely from the lower part of the upper plate. After fault movement had ceased, much of the carbonate fault breccia, here called calcibreccia, lay loose on the resulting surface of tectonic denudation. Before this unconsolidated calcibreccia could be removed by erosion, it was buried beneath a cover of Tertiary volcanic rocks: the Wapiti Formation, composed of volcanic breccia, poorly sorted volcanic breccia mudflows, and lava flows, and clearly shown in many places by inter lensing and intermixing of the calcibreccia with basal volcanic rocks. As the weight of volcanic overburden increased, the unstable water-saturated calcibreccia became mobile and semifluid and was injected upward as dikes into the overlying volcanic rocks and to a lesser extent into rocks of the upper plate. In some places the lowermost part of the volcanic overburden appears to have flowed with the calcibreccia to form dike like bodies of mixed volcanic rock and calcibreccia. One calcibreccia dike even contains carbonized wood, presumably incorporated into unconsolidated calcibreccia on the surface of tectonic denudation and covered by volcanic rocks before moving upward with the dike. Angular xenoliths of Precambrian rocks, enclosed in another calcibreccia dike and in an adjoining dikelike mass of volcanic rock as well, are believed to have been torn from the walls of a vent and incorporated into the basal part of the Wapiti Formation overlying the clastic carbonate rock on the fault surface. Subsequently, some of these xenoliths were incorporated into the calcibreccia during the process of dike intrusion. Throughout the Heart Mountain fault area, the basal part of the upper-plate blocks or masses are brecciated, irrespective of the size of the blocks, more intensely at the base and in places extending upward for several tens of meters. North of Republic Mountain a small 25-m-high upper-plate mass, brecciated to some degree throughout, apparently moved some distance along the Heart Mountain fault as brecciated rock. Calcibreccia dikes intrude upward from the underlying 2 m of fault breccia into the lower part of the mass and also from its top into the overlying volcanic rocks; an earthquake-related mechanism most likely accounts for the observed features of this deformed body. Calcibreccia dikes are more common within the bedding-plane phase of the Heart Mountain fault but also occur in its transgressive and former land-surface phases. Evidence that the Wapiti Formation almost immediately buried loose, unconsolidated fault breccia that was the source of the dike rock strongly suggests a rapid volcanic deposition over the area in which clastic dikes occur, which is at least 75 km long. Clastic dikes were injected into both the upper-plate and the volcanic rocks at about the same time, after movement on the Heart Mouuntain fault had ceased, and therefore do not indicate a fluid-flotation mechanism for the Heart Mountain fault. The difference between contacts of the clastic dikes with both indurated and unconsolidated country rock is useful in field mapping at localities where it is difficult to distinguish between volcanic rocks of the Cathedral Cliffs and Lamar River Formations, and the Wapiti Formation. Thus, calcibreccia dikes in the Cathedral Cliffs and Lamar River Formations show a sharp contact because the country rock solidified prior to fault movement, whereas calcibreccia dikes in the Wapiti Formation in many instances show a transitional or semifluid contact because the country rock was still unconsolidated or semifluid at the time of dike injection.

Pierce, W. G.

1979-01-01

259

Development and mapping of seleniferous soils in northwestern India.  

PubMed

Periodic surveys were undertaken to identify and characterize Se-contaminated soils in northwestern India. Total Se content varied from 0.023 to 4.91mgkg(-1) in 0-15cm surface soil and 0.64-515.0mgkg(-1) in samples of vegetation. Selenium-contaminated land occupying an area of 865ha was classified into different categories based on total Se content of soils as moderately contaminated (0.5-2.0mg Sekg(-1)) and highly contaminated (>2.0mg Sekg(-1)). The normal soils contained <0.5mg Sekg(-1). The soil map was prepared using village level cadastral maps. Se-contaminated soils were silty loam to silty clay loam in texture and tested pH 7.9-8.8, electrical conductivity 0.3-0.7dSm(-1), calcium carbonate 0.1-4.1% and organic carbon 0.4-1.0%. Selenium was present throughout the soil profile up to 2m depth; 0-15cm surface soil layer contained 1.5 to 6.0 times more Se than in subsurface layers. Selenium content in rock samples collected from lower and upper Shiwalik sub-Himalayan ranges varied from 1864 to 2754 and 11 to 847?gkg(-1), respectively. The sediments transported through seasonal rivulets linking the Shiwalik ranges to affected sites contained 0.57-2.89mg Sekg(-1). The underground water containing 2.5-69.5?g SeL(-1) used for irrigating transplanted rice grown in Se-contaminated area resulted in a net Se addition in soil up to 881gha(-1)y(-1); possibly further aggravating the Se-toxicity problem. Presence of substantial amount of Se in rock samples and sediments of seasonal rivulets suggests that Se-rich materials are being transported from Shiwalik hills and deposited in regions where seasonal rivulets end up. PMID:24210553

Dhillon, Karaj S; Dhillon, Surjit K

2014-03-01

260

Comparative phylogeography in marginal seas of the northwestern Pacific.  

PubMed

The maturation of marine phylogeography depends on integration of comparative information across different regions globally. The northwestern Pacific, characterized by unique tectonic setting, however, is still underrepresented. This study seeks to highlight its phylogeographical history based on the available population data, focusing on three seas: the East China Sea (ECS), the South China Sea (SCS) and the Sea of Japan (SOJ). We first conducted a literature survey to evaluate current research efforts and then reanalysed the population structure, historical demography and genealogy for two selections of studies (namely ‘the ECS category’ and ‘the multiple-sea category’) to elucidate the evolutionary processes within and across the seas, respectively. For the ECS category, the meta-analyses revealed most studies displayed a shallow phylogeny, indicating a single origin from the sea. Significant population structure was commonplace, particularly in molluck and crustacean studies, with proportions of 89% and 80%, respectively. Nearly all studies selected showed signals of population expansion: the times estimated were closely linked to a period of ~120-140 Kya rather than the last glacial maximum. For the latter category, divergent intraspecific lineages appeared among seas and overlapped in the adjacent regions, a pattern implying each sea had served as an independent refugium during glaciations. The genetic splits, however, were estimated to arise from separate events dating from late Miocene to middle Pleistocene. As phylogeography is still in its infancy in the region, more effort is needed to test and complement the general rules abstracted here. Finally, challenges and prospects were discussed to accelerate further research. PMID:24600706

Ni, Gang; Li, Qi; Kong, Lingfeng; Yu, Hong

2014-02-01

261

Determinants of fish assemblage structure in Northwestern Great Plains streams  

USGS Publications Warehouse

Prairie streams are known for their harsh and stochastic physical conditions, and the fish assemblages therein have been shown to be temporally variable. We assessed the spatial and temporal variation in fish assemblage structure in five intermittent, adventitious northwestern Great Plains streams representing a gradient of watershed areas. Fish assemblages and abiotic conditions varied more spatially than temporally. The most important variables explaining fish assemblage structure were longitudinal position and the proportion of fine substrates. The proportion of fine substrates increased proceeding upstream, approaching 100% in all five streams, and species richness declined upstream with increasing fine substrates. High levels of fine substrate in the upper reaches appeared to limit the distribution of obligate lithophilic fish species to reaches further downstream. Species richness and substrates were similar among all five streams at the lowermost and uppermost sites. However, in the middle reaches, species richness increased, the amount of fine substrate decreased, and connectivity increased as watershed area increased. Season and some dimensions of habitat (including thalweg depth, absolute distance to the main-stem river, and watershed size) were not essential in explaining the variation in fish assemblages. Fish species richness varied more temporally than overall fish assemblage structure did because common species were consistently abundant across seasons, whereas rare species were sometimes absent or perhaps not detected by sampling. The similarity in our results among five streams varying in watershed size and those from other studies supports the generalization that spatial variation exceeds temporal variation in the fish assemblages of prairie and warmwater streams. Furthermore, given longitudinal position, substrate, and stream size, general predictions regarding fish assemblage structure and function in prairie streams are possible. ?? American Fisheries Society 2011.

Mullen, J. A.; Bramblett, R. G.; Guy, C. S.; Zale, A. V.; Roberts, D. W.

2011-01-01

262

Benthic-Pelagic coupling in the Black Sea northwestern shelf  

NASA Astrophysics Data System (ADS)

A new approach for modeling the benthic compartment in 3D ocean models is applied to analyze the benthic-pelagic coupling in the Black Sea northwestern shelf (BS-NWS) and to review the contribution of sedimentary diagenesis to the BS-NWS biogeochemical cycles (nitrogen, oxygen and carbon). This approach combines an explicit representation of sediment organic matter deposition and resuspension, controlled by the bottom shear stress, and a parameterization of mineralization pathways control by bottom environmental properties. The model reproduces the magnitude and inter-regional and seasonal variability depicted by in situ benthic fluxes estimates obtained by benthic chambers and sediment cores incubations. The model illustrates how this observed variability results from both variable sedimentation rate and variable diagenetic pathways in the sediment layer. Three distinct areas are identified based on the analysis of the simulated seasonal cycle of bottom environmental conditions, benthic-pelagic fluxes and diagenetic processes. These areas extend along a gradient from the land-ocean interface to the open sea boundary and are each characterized by a particular diagenetic pathway, in a way similar as they succeed vertically in a sediment profile. (1) In the hypoxic zone, high remineralization rates lead to a seasonal peak in anoxic diagenesis and under certain conditions to hydrogen sulphide effluxes from the sediment, (2) in the denitrification zone, benthic denitrification rates are maximal and (3) in the oxic zone, where organic matter accumulation are low, oxic diagenesis prevails and seasonality is less marked. This study underlines that representing resuspension and deposition processes in coupled benthic-pelagic models is essential to realistically describe the horizontal distribution of benthic-pelagic fluxes and the export from the shelf region to the deep sea.

Capet, Arthur; Akoumianaki, Ionna; Meysman, Filip; Soetaert, Karline; Grégoire, Marilaure

2014-05-01

263

Hydrogeochemistry and simulated solute transport, Piceance Basin, northwestern Colorado  

USGS Publications Warehouse

Oil-shale mining activities in Piceance basin in northwestern Colorado could adversely affect the ground- and surface-water quality in the basin. This study of the hydrology and geochemistry of the area used ground-water solute-transport-modeling techniques to investigate the possible impact of the mines on water quality. Maps of the extent and structure of the aquifer were prepared and show that a saturated thickness of 2,000 feet occurs in the northeast part of the basin. Ground-water recharge in the upland areas in the east, south, and west parts of the basin moves down into deeper zones in the aquifer and laterally to the discharge areas along Piceance and Yellow Creeks. The saline zone and the unsaturated zone provide the majority of the dissolved solids found in the ground water. Precipitation, ion-exchange, and oxidation-reduction reactions are also occuring in the aquifer. Model simulations of ground-water pumpage in tracts C-a and C-b indicate that the altered direction of ground-water movement near the pumped mines will cause an improvement in ground-water quality near the mines and a degradation of water quality downgradient from the tracts. Model simulations of mine leaching in tract C-a and C-b indicate that equal rates of mine leaching in the tracts will produce much different effects on the water quality in the basin. Tract C-a, by virtue of its remote location from perennial streams, will primarily degrade the ground-water quality over a large area to the northeast of the tract. Tract C-b, by contrast, will primarily degrade the surface-water quality in Piceance Creek, with only localized effects on the ground-water quality. (USGS)

Robson, S.G.; Saulnier, G.J., Jr.

1981-01-01

264

Hydrogeochemistry and simulated solute transport, Piceance Basin, northwestern Colorado  

USGS Publications Warehouse

Oil-shale mining activities in Piceance basin in northwestern Colorado could adversely affect the ground- and surface-water quality in the basin. This study of the hydrology and geochemistry of the area used groundwater solute-transport-modeling techniques to investigate the possible impact of the mines on water quality. Maps of the extent and structure of the aquifer were prepared and show that a saturated thickness of 2,000 feet occurs in the northeast part of the basin. Ground-water recharge in the upland areas in the east, south, and west parts of the basin moves down into deeper zones in the aquifer and laterally to the discharge areas along Piceance and Yellow Creeks. The saline zone and the unsaturated zone provide the majority of the dissolved solids found in the ground water. Precipitation, ion-exchange, and oxidation-reduction reactions are also occurring in the aquifer. Model simulations of groundwater pumpage in tracts C-a and C-b indicate that the altered direction of groundwater movement near the pumped mines will cause an improvement in groundwater quality near the mines and a degradation of water quality downgradient from the tracts. Model simulations of mine leaching in tract C-a and C-b indicate that equal rates of mine leaching in the tracts will produce much different effects on the water quality in the basin. Tract C-a, by virtue of its remote location from perennial streams, will primarily degrade the groundwater quality over a large area to the northeast of the tract. Tract C-b, by contrast, will primarily degrade the surface-water quality in Piceance Creek, with only localized effects on the groundwater quality. (USGS)

Robson, Stanley G.; Saulnier, George J.

1980-01-01

265

Mesozoic stratigraphy of northwestern Australian and northern Himalayan margins  

SciTech Connect

The Mesozoic stratigraphies of the Himalayan margin, the Argo abyssal plain, and the Exmouth Plateau exhibit marked contrasts in their sedimentation histories. The sedimentary sequence on the northeastern Exmouth Plateau off Australia includes a Carnian to Rhaetian sequence of fluviodeltaic and marine clastics and carbonates, capped by a shallowing-upward sequence of platform carbonates overlain, with a major unconformity, by marine Aptian sediments deposited during rapid subsidence of the plateau. Argo abyssal plain basement is overlain by red-brown, bioturbated, inoceramid-rich quartzose claystones, bentonites, and quartz siltstones, dated by radiolarians and benthic foraminifera as lowest Cretaceous. This is overlain by red and green claystones and nannofossil chalks. The basal age indicates that sea-floor spreading began in the earliest Cretaceous, not Oxfordian as had been thought. In the Thakkola region of Nepal, uppermost Triassic through Lower Jurassic shelf and carbonate platform facies are capped by a ferruginous oolite deposit of latest Bathonian to earliest Callovian age. Sedimentation resumed in the middle Oxfordian with deposition of Berriasian( ) deep-water black organic-rich mud. Following a valanginian regression and progradation of terrigenous clastics, Aptian black shales were deposited. In geological studies of the northwestern Australian margin, the ubiquitous hiatus within the Callovian-Oxfordian has been termed the breakup unconformity. Existence of a similar-aged hiatus in the Himalayas on a margin which formed during the late Paleozoic, absence of any Jurassic on the Exmouth Plateau, and the apparent initiation of spreading in the Argo basin during the earliest Cretaceous suggest that this widespread unconformity is not associated with a continental breakup in these regions.

Ogg, J.; Kopaskamerkel, D.C.

1989-03-01

266

A soil catena on schist in northwestern California  

USGS Publications Warehouse

Soil characteristics in a small steepland watershed underlain by schist in a rainy, tectonically active area in northwestern California show close associations with drainage-basin position and slope characteristics. Five soil-topography units based on these associations are defined in the study watershed. Spatial relationships of soil series, and patterns of soil development as indicated by B-horizon clay content and redness, reflect interactions between pedogenesis and erosion. General soil-topography patterns include: (1) decreases in soil-development moving from low-order to higher-order stream vallyes; and (2) more developed soils on north-facing as opposed to south-facing slopes. Decreases in soil-profile development moving from slopes near low-order streams to slopes near higher-order streams approximately correlate with increases in gradient, vertical relief, and drainage density, and reflect a more vigorous stripping of regolith by erosion on the slopes near the higher-order streams. The larger percentage of area covered by the more developed soils on north-facing as opposed to south-facing slopes appears to reflect a contrast in the way dominant erosional processes interact with pedogenic processes. Roadcuts on middle and upper slopes show soil discontinuities indicative of disturbance by block slides or slumps or both. Roadcuts on lower slopes show disrupted soils in small bedrock hollows that could have been created by rapid, shallow landslides or by the pulled-up root wads of toppled trees. Soil-profile characteristics and soil-topography patterns in the study area demonstrate that both erosional and pedogenic processes need to be considered when interpreting characteristics of hillslope soils. ?? 1986.

Marron, D. C.; Popenoe, J. H.

1986-01-01

267

The earliest evidence for anatomically modern humans in northwestern Europe.  

PubMed

The earliest anatomically modern humans in Europe are thought to have appeared around 43,000-42,000 calendar years before present (43-42 kyr cal BP), by association with Aurignacian sites and lithic assemblages assumed to have been made by modern humans rather than by Neanderthals. However, the actual physical evidence for modern humans is extremely rare, and direct dates reach no farther back than about 41-39 kyr cal BP, leaving a gap. Here we show, using stratigraphic, chronological and archaeological data, that a fragment of human maxilla from the Kent's Cavern site, UK, dates to the earlier period. The maxilla (KC4), which was excavated in 1927, was initially diagnosed as Upper Palaeolithic modern human. In 1989, it was directly radiocarbon dated by accelerator mass spectrometry to 36.4-34.7 kyr cal BP. Using a Bayesian analysis of new ultrafiltered bone collagen dates in an ordered stratigraphic sequence at the site, we show that this date is a considerable underestimate. Instead, KC4 dates to 44.2-41.5 kyr cal BP. This makes it older than any other equivalently dated modern human specimen and directly contemporary with the latest European Neanderthals, thus making its taxonomic attribution crucial. We also show that in 13 dental traits KC4 possesses modern human rather than Neanderthal characteristics; three other traits show Neanderthal affinities and a further seven are ambiguous. KC4 therefore represents the oldest known anatomically modern human fossil in northwestern Europe, fills a key gap between the earliest dated Aurignacian remains and the earliest human skeletal remains, and demonstrates the wide and rapid dispersal of early modern humans across Europe more than 40 kyr ago. PMID:22048314

Higham, Tom; Compton, Tim; Stringer, Chris; Jacobi, Roger; Shapiro, Beth; Trinkaus, Erik; Chandler, Barry; Gröning, Flora; Collins, Chris; Hillson, Simon; O'Higgins, Paul; FitzGerald, Charles; Fagan, Michael

2011-11-24

268

Reclamation studies on oil shale lands in northwestern Colorado  

SciTech Connect

The overall objective of this project is to study the effects of various reclamation practices on above- and belowground ecosystem development associated with disturbed oil shale lands in northwestern Colorado. Plant growth media that are being used in field test plots include retorted shale, soil over retorted shale, subsoil materials, and surface disturbed topsoils. Some of the more significant results are: (1) a soil cover of at least 61 cm in conjunction with a capiallary barrier provided the best combination of treatments for the establishment of vegetation and a functional microbial community, (2) aboveground production values for native and introduced species mixtures are comparable after three growing seasons, (3) cover values for native species mixtures are generally greater than for introduced species, (4) native seed mixtures, in general, allow greater invasion to occur, (5) sewage sludge at relatively low rates appears to provide the most beneficial overall effect on plant growth, (6) cultural practices, such as irrigated and mulching have significant effects on both above- and belowground ecosystem development, (7) topsoil storage after 1.5 years does not appear to significantly affect general microbial activities but does reduce the mycorrhizal infection potential of the soil at shallow depths, (8) populations of mycorrhizal fungi are decreased on severely disturbed soils if a cover of vegetation is not established, (9) significant biological differences among ecotypes of important shrub species have been identified, (10) a vegetation model is outlined which upon completion will enable the reclamation specialist to predict the plant species combinations best adapted to specific reclamation sites, and (11) synthetic strains of two important grass species are close to development which will provide superior plant materials for reclamation in the West.

Cook, C.W.; Redente, E.F.

1980-02-01

269

Assessing impacts of unconventional natural gas extraction on microbial communities in headwater stream ecosystems in Northwestern Pennsylvania  

PubMed Central

Hydraulic fracturing and horizontal drilling have increased dramatically in Pennsylvania Marcellus shale formations, however the potential for major environmental impacts are still incompletely understood. High-throughput sequencing of the 16S rRNA gene was performed to characterize the microbial community structure of water, sediment, bryophyte, and biofilm samples from 26 headwater stream sites in northwestern Pennsylvania with different histories of fracking activity within Marcellus shale formations. Further, we describe the relationship between microbial community structure and environmental parameters measured. Approximately 3.2 million 16S rRNA gene sequences were retrieved from a total of 58 samples. Microbial community analyses showed significant reductions in species richness as well as evenness in sites with Marcellus shale activity. Beta diversity analyses revealed distinct microbial community structure between sites with and without Marcellus shale activity. For example, operational taxonomic units (OTUs) within the Acetobacteracea, Methylocystaceae, Acidobacteriaceae, and Phenylobacterium were greater than three log-fold more abundant in MSA+ sites as compared to MSA? sites. Further, several of these OTUs were strongly negatively correlated with pH and positively correlated with the number of wellpads in a watershed. It should be noted that many of the OTUs enriched in MSA+ sites are putative acidophilic and/or methanotrophic populations. This study revealed apparent shifts in the autochthonous microbial communities and highlighted potential members that could be responding to changing stream conditions as a result of nascent industrial activity in these aquatic ecosystems. PMID:25408683

Trexler, Ryan; Solomon, Caroline; Brislawn, Colin J.; Wright, Justin R.; Rosenberger, Abigail; McClure, Erin E.; Grube, Alyssa M.; Peterson, Mark P.; Keddache, Mehdi; Mason, Olivia U.; Hazen, Terry C.; Grant, Christopher J.; Lamendella, Regina

2014-01-01

270

Borrelia crocidurae in Ornithodoros ticks from northwestern Morocco: a range extension in relation to climatic change?  

PubMed

Tick-borne relapsing fever (TBRF) is caused by Borrelia spirochetes transmitted to humans by Argasid soft ticks of the genus Ornithodoros. We investigated the presence of Ornithodoros ticks in rodent burrows in nine sites of the Gharb region of northwestern Morocco where we recently documented a high incidence of TBRF in humans. We assessed the Borrelia infection rate by nested PCR and sequencing. All sites investigated were colonized by ticks of the Ornithodoros marocanus complex and a high proportion of burrows (38.4%) were found to be infested. Borrelia infections were observed in 6.8% of the ticks tested. Two Borrelia species were identified by sequencing: B. hispanica and B. crocidurae. The discovery in northwestern Morocco of Ornithodoros ticks infected by B. crocidurae represents a 350 km range extension of this Sahelo-Saharan spirochete in North Africa. The spread of B. crocidurae may be related to the increasing aridity of northwestern Morocco in relation to climate change. PMID:25424260

Souidi, Yassine; Boudebouch, Najma; Ezikouri, Sayeh; Belghyti, Driss; Trape, Jean-François; Sarih, M'hammed

2014-12-01

271

Range-wide phylogeographic analysis of the spotted frog complex ( Rana luteiventris and Rana pretiosa) in northwestern North America  

Microsoft Academic Search

The dynamic geological and climatic history of northwestern North America has made it a focal region for phylogeography. We conducted a range-wide phylogeographic analysis of the spotted frog complex (Rana luteiventris and Rana pretiosa) across its range in northwestern North America to understand its evolutionary history and the distribution of clades to inform conservation of R. pretiosa and Great Basin

W. Chris Funk; Christopher A. Pearl; Hope M. Draheim; Michael J. Adams; Thomas D. Mullins; Susan M. Haig

2008-01-01

272

Experimental evidence that oral secretions of northwestern ring-necked snakes ( Diadophis punctatus occidentalis) are toxic to their prey  

Microsoft Academic Search

Ring-necked snakes (Diadophis punctatus) are suspected of being venomous because their Duvernoy's gland secretions have high levels of phospholipase activity, which is characteristic of many viperid and elapid venoms, and because anecdotal reports of feeding behavior are consistent with the use of a venom. We tested the toxicity of northwestern ring-necked snake oral secretions to a natural prey species, northwestern

Ryan P. O’Donnell; Kevin Staniland; Robert T. Mason

2007-01-01

273

Late quaternary pollen records from the Kobuk and Noatak river drainages, northwestern Alaska  

NASA Astrophysics Data System (ADS)

Pollen diagrams from Joe and Niliq Lakes date to ca. 28,000 and 14,000 yr B.P., respectively. Mesic shurb tundra grew near Joe Lake ca. 28,000 to 26,000 yr B.P. with local Populus populations prior to ca. 27,000 yr B.P. Shrub communities decreased as climate changed with the onset of Itkillik II glaciation (25,000 to 11,500 yr B.P.), and graminoid-dominated tundra characterized vegetation ca. 18,500 to 13,500 yr B.P. Herb tundra was replaced by shrub Betula tundra near both sites ca. 13,500 yr B.P. with local expansion of Populus ca. 11,000 to 10,000 yr B.P. and Alnus ca. 9000 yr B.P. Mixed Picea glauca/P. mariana woodland was established near Joe Lake ca. 6000 yr B.P. These pollen records when combined with others from northern Alaska and northwestern Canada indicate (1) mesic tundra was more common in northwestern Alaska than in northeastern Alaska or northwestern Canada during the Duvanny Yar glacial interval (25,000 to 14,000 yr B.P.); (2) with deglaciation, shrub Betula expanded rapidly in northwestern Alaska but slowly in areas farther east; (3) an early postglacial thermal maximum occurred in northwestern Alaska but had only limited effect on vegetation; and (4) pollen patterns in northern Alaska and northwestern Canada suggest regional differences in late Quaternary climates.

Anderson, Patricia M.

1988-05-01

274

Dense shelf water cascades in two northwestern Mediterranean submarine canyon heads during winters 2007 and 2008  

NASA Astrophysics Data System (ADS)

Submarine canyons incised in continental margins are considered to be preferential pathways for the exchange of water and particles between the coastal area and the open sea. Hydrodynamics and sediment transport processes in submarine canyons depend upon several forcing conditions in the region such as general circulation, seafloor morphology and atmospheric regime. The off-shelf sediment transport trough submarine canyons, due to storms and river floods, can be significant and recently dense shelf-water cascading (DSWC) has been also identified as an important transport mechanism able to generate high sediment fluxes in submarine canyons. DSWC is seasonal, resulting from the formation of dense water by cooling and/or evaporation over the shelf, and occurs on both high- and low latitude continental margins. The Palamós and the Cap de Creus submarine canyon heads were instrumented during two consecutive winters to study their respective role in the dynamics of the sediment transport on the northwestern Mediterranean Sea. The Cap de Creus submarine canyon has been intensively studied during the past years as it acts as a major transport conduit during storms and DSWC events. On the contrary, little information exists about the sediment transport processes operating within the Palamós submarine canyon during winter conditions. Observational work during this study consisted of a series of field measurements carried out with instrument moorings during winters 2007 and 2008 at the heads of both submarine canyons, at around 300 m depth. These moorings were equipped with a current meter with temperature, conductivity, pressure and turbidity sensors, placed at 5 m above the seafloor. Multibeam bathymetry from both canyon heads was also acquired and used to determine the canyon axis morphology, which was considered to compute down-canyon fluxes. Forcing conditions were obtained from oceanographic buoys and gaps in the wave height and peak period time series were filled with models outputs. Daily river discharges from nearby rivers were also analyzed. Sediment transport events during winters 2007 and 2008 were quite similar, and several DSWC events were identified and compared among them. Down-canyon current velocities of > 60 cm/s were detected in the Cap de Creus Canyon, and velocities of > 40 cm/s in the Palamós Canyon. Increases in current speed were associated with subtle drops in temperature (~ 1 °C) related to DSWC, and peaks of suspended sediment concentration. Values up to 170 mg/l were recorded during both studied winters at the Cap de Creus canyon head coinciding with the first DSWC event concurrent with an eastern storm. During both study periods no relation was found between sediment transport events and nearby river discharges. The amount of sediment transported during DSWC events at the Cap de Creus Canyon was one order of magnitude greater than the one observed at the Palamós Canyon. This corroborates the fact that most of the off-shelf sediment transport in the northwestern Mediterranean during DSWC events occurs at the southwestern end of the Gulf of Lions, through the Cap de Creus submarine canyon.

Ribo, Marta; Puig, Pere; Palanques, Albert; Lo Iacono, Claudio

2010-05-01

275

Epidemiology of pleural mesothelioma in North-western Italy (Piedmont)  

PubMed Central

Rubino, G. F., Scansetti, G., Donna, A., and Palestro, G. (1972).Brit. J. industr. Med.,29, 436-442. Epidemiology of pleural mesothelioma in North-western Italy (Piedmont). Fifty-four cases of mesothelioma of the pleura admitted to the Chest Surgery Centre or to the Department of Medicine of the University of Turin from 1960 to 1970 are reported. Thoracotomy was performed in 22. In the other 32 the diagnosis was based on the clinical, radiographic, and cytological findings and on the results of biopsy. In 50 cases (18 women and 32 men), the majority of whom had always or mostly lived in Piedmont, it was possible to ascertain the family history, previous residence, and occupation, mainly with the aid of information given by the patient's relatives. A similar investigation was made by the same interviewers into 50 other patients of the same sex and age admitted to the same institutions, using an identical technique. In the group with mesothelioma (only two of whom survived more than two years after the diagnosis had been made) occupational exposure to asbestos was demonstrated unequivocally in five men. Three other patients, including one woman, had lived with persons employed in the asbestos industry (16%). Exposure for occupational reasons seemed very likely in another patient, who had been a fireman in the Turin Arsenal for 40 years. One man in the control group had worked for two years in a cement-asbestos manufacturing company (2%). A re-appraisal of the histological sections and examination of new preparations made in the 22 cases operated on was done in the Department of Pathological Anatomy of the University of Turin, also with the purpose of confirming the diagnosis. This re-appraisal revealed the presence of asbestos bodies in the mesothelioma in one case, a woman who had never been exposed to asbestos for occupational or domestic reasons but who had always lived in one of the two regions of the Province of Turin with the highest number of asbestos industries. Images PMID:4636663

Rubino, G. F.; Scansetti, G.; Donna, A.; Palestro, G.

1972-01-01

276

Molecular identification of Theileria parasites of northwestern Chinese Cervidae  

PubMed Central

Background Theileria and Babesia protozoan parasites are transmitted mainly by tick vectors. These parasites cause heavy economic losses to the live-stock industry, as well as affecting the health of wild animals in parasite-endemic areas. Identification of infectious agents in wild animals is not only crucial for species preservation, but also provides valuable information on parasite epidemiology. Here, we conducted a molecular surveillance study in Northwestern China to assess the prevalence of blood pathogens in cervids. Methods PCR analysis and microscopic evaluation of blood smears to detect Theileria- and Babesia-related diseases in Cervidae were conducted, in which 22 blood samples from red deer (n?=?22) in Qilian Mountain and 20 from sika deer (n?=?20) in Long Mountain were collected and tested for the presence of Theileria and Babesia. The 18S rRNA gene was amplified, and selected polymerase chain reaction (PCR)-positive samples were sequenced for species identification. Results PCR revealed that 9.1% of the Qilian Mountain samples and 20% of the Long Mountain samples were positive for Theileria uilenbergi; 90.09% of the Qilian Mountain samples (n?=?22) were positive for T. capreoli, but all of the Long Mountain samples (n?=?20) were negative for T. capreoli; no other Theileria or Babesia species were found. PCR showed that T. uilenbergi and T. capreoli were present in red deer in Qilian Mountain, while only T. uilenbergi was found in sika Deer in Long Mountain. The 18S rRNA gene sequences were aligned against the corresponding GenBank sequences of known isolates of Theileria and Babesia and subjected to phylogenetic analysis. The phylogenetic tree showed that the newly isolated Theileria spp. could be classified as belonging to two clades: one group belonged to the same clade as T. uilenbergi, the other to a clade containing T. capreoli. Conclusions Our results provide important data to increase understanding of the epidemiology of Cervidae theileriosis, and will assist with the implementation of measures to control theileriosis transmission to Cervidae and small ruminants in central China. PMID:24885179

2014-01-01

277

Deformation of Northwestern South America from GPS Geodesy  

NASA Astrophysics Data System (ADS)

The North Andes block (NAB) is a hypothesized tectonic block that migrates (escapes) north-northeast relative to a stable South American reference frame. The motion of this block is thought-to-be derived by the collision of the Carnegie Ridge in southern Ecuador and/or by oblique convergence and high degrees of interplate coupling north of the ridge (i.e., strain partitioning). At the latitude of Ecuador, the NAB is defined by transpressional deformation accommodating east-northeastward motion along its boundary with South America. In southern to central Colombia, the NAB is dissected by several mapped and prominent regional shear zones. At these latitudes the NAB may be bound to the west by the Choco block and the transpressional Atrato-Uraba fault system and to the east by the Guayaquil-Algeciras fault system. And in northern Colombia the Caribbean - South America plate boundary is defined by the NAB and proposed Maracaibo and Guajira blocks. We investigate the deformation of northwestern South America, including the kinematics of NAB utilizing a new velocity field based on continuous GPS and existing episodic GPS data in Ecuador, Colombia, Venezuela and Panama. We reference these new velocities to a newly estimated Euler vector for the South America plate based on inversion of cGPS data from stations east of the Andes. The new velocity field and published earthquake slip vectors are inverted to solve for the Euler vectors of the NAB, Choco, Panama, Maracaibo and Guajira blocks and interseismic elastic strain accumulation (interseismic coupling) on block-bounding faults using a block modeling approach. We test a suite of block models to investigate the tectonic nature of the NAB along strike and the style of faulting in the upper plate accommodating block motion. Through the estimation of elastic strain accumulation on all block-bounding faults, we improve the understanding of interseismic coupling along a convergent margin capable of producing M>8 earthquakes and faults in the upper plate capable of generating M>6 earthquakes.

Mora-Paez, H.; La Femina, P. C.; Mothes, P. A.; Ruiz, A. G.; Fernandes, R. M.

2013-12-01

278

Changing Coastal oceanography of the Black Sea. I: Northwestern Shelf  

NASA Astrophysics Data System (ADS)

This article describes the hydrography of the Northwestern Shelf (NWS), of the Black Sea emphasizing the changes induced by water management in the Dniejer and Dniester river basins. The existing literature and previously unpublished data have been reviewed and synthesized to describe water property fields and transport mechanisms of the NWS and the Dnieper and Dniester estuaries before the early 1960s, or the so-called precontrol period, when the effect of artificial river flow control upon the coastal waters was insignificant. After the hydroenergy complexes and water withdrawal and disposal systems on rivers became fully operational in the early 1970s (the so-called postcontrol period), the annual river discharge from the Dnieper and Dniester had noticeably decreased and seasonal river flow patterns had been artificially modified. Instead of a powerful and short early spring flood, typical for the natural conditions in the Dnieper river, the hydrographs in the postcontrol period exhibit two smaller peaks of river discharge of much longer period. One of them (winter-early spring) is caused by intense hydroenergy generation and weir discharges through the cascade of storage reservoirs. Another is associated with spring flood, modified by intense water consumption and storage in this period. High average river discharge in late May-early June strengthened the summer pycnocline which inhibits vertical mixing in the estuaries and coastal waters. Owing to a slow summer circulation, the rate of natural purification of the entire coastal system has been reduced. This coupled with the increased nutrient, organic and pollutant transport, decreased the dissolved-oxygen concentration and led to anoxic events and mass mortalities of marine organisms in the previously productive regions. These effects have primarily plagued the benthic communities along the entire western coast of the NWS since 1973. Winter convective overturn in the Black Sea reaches its maximum depth at the southern boundary of the NWS. Thus, the NWS waters descend beneath the seasonal and main thermoclines in the open sea and are spread by the prevailing currents across the entire sea in the cold intermediate layer (CIL). By this dynamic mechanism the projected man-made modifications in the riverine-estuarine systems of the NWS will affect and change the large-scale thermohaline structure and marine life of the Black Sea.

Tolmazin, D.

279

Sedimentation of the Triassic–Jurassic Adigrat Sandstone Formation, Blue Nile (Abay) Basin, Ethiopia  

Microsoft Academic Search

Exploration of oil and gas deposits in the Blue Nile Basin targeted the Adigrat Sandstone Formation as a reservoir objective. Conglomerates, gravely sandstones, coarse to medium-grained sandstones, very fine-grained cross-bedded sandstones, siltstones and mudstones of the Adigrat Sandstone Formation were deposited in semi-arid to arid climates. The North-western highlands are the main source for the sedimentation. The poorly-sorted, crudely-bedded conglomerates

A. Wolela

2008-01-01

280

Syntectonic sedimentation in the Proterozoic upper Belt Supergroup, northwestern Montana  

SciTech Connect

Deepening environments in the Proterozoic Libby Formation record a tectonically induced style of sedimentation distinctly different from that of older Belt rocks. Facies associations and sedimentary structures indicate that deposition in the lower Libby Formation occurred above fair-weather wave base. Thick, widespread hummocky cross-stratified quartzite in the upper Libby Formation lacks the association of shallow-water features present in the lower Libby Formation, suggesting that upper Libby deposition occurred below fair-weather wave base and above storm wave base. Independent evidence for tectonism during deposition of the Belt Supergroup exists but is plagued by poor age control. The angular unconformity that occurs between Libby-equivalent rocks and the overlying Windermere Supergroup indicates tectonic activity between deposition of the Belt-Purcell and Windermere Supergroups. The interpreted subsidence or rise in basin water level combined with newly uplifted source areas as recorded in the upper Libby Formation and Garnet Range Formation could have been an early manifestation of movements that produced this unconformity.

Kidder, D.L.

1988-07-01

281

Aspects of the ecology of coastal tundra raised beach ridges in Northwestern Ontario  

Microsoft Academic Search

The structure of lichen dominated vegetation is described within a series of raised beach ridges found along the strip of coastal tundra in northwestern Ontario. The patterns of distribution of the most abundant species correlated with the topographic influences of individual beach ridges more than with the influences of the general developmental sequence of vegetation from the coast of Hudson

Douglas William Larson

1975-01-01

282

PREGNANCy HEALTH AND OUTCOME IN TWO CITIES IN THE KOLA PENINSULA, NORTHWESTERN RUSSIA  

Microsoft Academic Search

Objectives. The aims of the study were to compare the prevalence of selected maternal and lifestyle factors as well as the reproductive outcome of working women in two cities in Northwestern Russia (Mon?egorsk and Apatity), and to assess the quality of pregnancy-outcome data obtained in an inter- view with registered information. Study design. A retrospective questionnaire study in an interview

Ljudmila Vasiljevna Talykova; Arild Vaktskjold; Natalja Jurievna Strelkovskaja; Valerij Petrovitsj Chashchin; Jon Øyvind Odland; Vladimir Bykov; Evert Nieboer

2007-01-01

283

Northwestern scientists develop new drug that prevents spread of human prostate cancer cells in mice  

Cancer.gov

A new drug developed by Northwestern Medicine scientists prevented human prostate cancer cells transplanted into mice from spreading to other tissues without any toxic effects to normal cells or tissues. The drug turns off the "go" switch in the cancer cells and immobilizes them.

284

OLIGOCENE TERRESTRIAL STRATA OF NORTHWESTERN ETHIOPIA: A PRELIMINARY REPORT ON PALEOENVIRONMENTS AND PALEONTOLOGY  

Microsoft Academic Search

The Paleogene record of Afro-Arabia is represented by few fossil localities, most of which are coastal. Here we report sedimentological and paleontological data from continental Oligocene strata in northwestern Ethiopia. These have produced abundant plant fossils and unique assemblages of vertebrates, thus filling a gap in what is known of Paleogene interior Afro-Arabia. The study area is approximately 60 km

Bonnie F. Jacobs; Neil Tabor; Mulugeta Feseha; Aaron Pan; John Kappelman; Tab Rasmussen; William Sanders; Michael Wiemann; Jeff Crabaugh; Juan Leandro Garcia Massini

2005-01-01

285

Attracting a New Market to Northwestern's Undergraduate Programs: Older Women Living on the North Shore.  

ERIC Educational Resources Information Center

Women over age 25 represent a substantial age group that may be recruited to bolster undergraduate student recruitment efforts at Northwestern University and similar institutions of higher education. By 1990, the number of recruitable 18-year-olds will fall by 20 percent nationwide, causing financial hardship for many private colleges and…

Fox, Karen F. A.

286

Cost-Efficient Dragonfly Topology for Large-Scale Systems Northwestern University  

E-print Network

Cost-Efficient Dragonfly Topology for Large-Scale Systems John Kim Northwestern University Evanston network. In this paper, we introduce the dragonfly topology which uses a group of high-radix routers routed packet traverses at most one global channel. By reducing global channels, a dragonfly reduces cost

Tomkins, Andrew

287

NorthWestern Energy Community Works Scholarship for Native American Students in Engineering  

E-print Network

NorthWestern Energy Community Works Scholarship for Native American Students in Engineering A special new scholarship opportunity for Native American students! In order to encourage and support Native competitively to Native American students who meet the qualifications based on submission of an application

Dyer, Bill

288

The Areal Pattern of Burned Tree Vegetation in the Subarctic Region of Northwestern Canada  

Microsoft Academic Search

Vegetation and terrain analyses of 1312 air photos spanning the subarctic, low arctic, and portions of the adjacent high boreal region of northwestern Canada permitted geographic characterization of the areal pattern of burned forest and forest-tundra vegetation. In terms of its lower areal extent of burns, and lower frequency of air photos showing burns, the forest-tundra is distinct from both

K. P. TIMONEY; ROSS W. WEIN

1991-01-01

289

Atmospheric input of dissolved and particulate metals to the northwestern Mediterranean  

Microsoft Academic Search

Concentrations of trace elements (Al, Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb and Zn) were determined for aerosols, dry deposition, precipitation and total deposition samples collected from five stations on islands and in the coastal zone of the northwestern Mediterranean. Average concentrations of metals are very homogeneous over the sampled area, in particular at the three coastal sites. Cd

C. Guieu; R. Chester; M. Nimmo; J.-M. Martin; S. Guerzoni; E. Nicolas; J. Mateu; S. Keyse

1997-01-01

290

Forest fires, woodland caribou and land use policies in northwestern Ontario (Rangifer tarandus)  

Microsoft Academic Search

Woodland caribou (Rangifer tarandus caribou) are a threatened species in Ontario's boreal forest. Caribou require habitat that supports appropriate forage, including large areas of lichen rich forests. This research examines two dynamics that influence woodland caribou habitat in northwestern Ontario. These dynamics are forest fires and land use policies. The effects of forest fires are assessed quantitatively at both the

Brian Frederick Kutas

2004-01-01

291

Forest landscape change in the northwestern Wisconsin Pine Barrens from pre-European  

E-print Network

forests in the North disappeared. These changes, especially the increase in forest cover, are ecologicallyForest landscape change in the northwestern Wisconsin Pine Barrens from pre-European settlementth century and related it to the vegetation cover in 1987 as depicted in a Landsat satellite forest

Mladenoff, David

292

Review of Gizzard Shad Population Dynamics at the Northwestern Edge of Its Range  

Microsoft Academic Search

Gizzard shad Dorosoma cepedianum is widely distributed in North America, and South Dakota marks the northwestern edge of its native range. To date, most research regarding population dynamics of gizzard shad has been con- ducted in more southerly waters. We reviewed the dynamics and biology of giz- zard shad populations in South Dakota and compared this information with that reported

Melissa R. Wuellne R; W. Willis

293

Three-dimensional seismic velocity structure of the northwestern United States  

E-print Network

Zone. A model explaining the regional tectonomagmatic history consistent with the imaged seismic. Introduction [2] The Cascadia subduction zone of northwestern North America, notably the descending Juan de the migrating silicic volcanism across most of the western U.S. in the Paleogene, known as the ignimbrite sweep

Fouch, Matthew J.

294

Late quaternary vegetational change in the Kotzebue sound area, northwestern Alaska  

SciTech Connect

Two sediment cores from Kaiyak and Squirrel lakes in northwestern Alaska yielded pollen records that date to ca. 39,000 and 27,000 yr B.P., respectively. Between 39,000 and 14,000 yr B.P., the vegetation around these lakes was dominated by Gramineae and Cyperaceae with some Salix and possibly Betula nana/glandulosa forming a local, shrub component of the vegetation. Betula pollen percentages increased about 14,000 yr B.P., indicating the presence of a birch-dominated shrub tundra. Alnus pollen appeared at both sites between 9000 and 8000 yr B.P., and Picea pollen (mostly P. mariana) arrived at Squirrel Lake about 5000 yr B.P. The current forest-tundra mosaic around Squirrel Lake was established at this time, whereas shrub tundra existed near Kaiyak Lake throughout the Holocene. When compared to other pollen records from northwestern North America, these cores (1) represent a meadow component of lowland, Beringian tundra between 39,000 and 14,000 yr B.P., (2) demonstrate an early Holocene arrival of Alnus in northwestern Alaska that predates most other Alnus horizons in northern Alaska or northwestern Canada, and (3) show an east-to-west migration of Picea across northern Alaska from 9000 to 5000 yr B.P.

Anderson, P.M.

1985-01-01

295

Evidence for bimodal hybrid zones between two species of char (Pisces: Salvelinus) in northwestern North America  

Microsoft Academic Search

Dolly Varden (Salvelinus malma, Pisces: Salmonidae) and bull trout (Salvelinus confluentus) have widely overlapping, but largely parapatric ranges in water- sheds in northwestern North America from Washington State to northern British Columbia. Genetic analysis of natural populations using diagnostic molecular markers revealed widespread local sympatry and hybridization with hybrids comprising 0-25% of the local samples. In a detailed analysis of

Z. Redenbach; E. B. Taylor

2003-01-01

296

Northwestern University Chicago Campus Martin Luther King Commemoration Art Contest Entry Form  

E-print Network

and pertain to Dr. King's statement that "Anyone can be great because anyone can serve." We encourage art work that expresses what Dr. King's legacy of service means to the artist. 6. A completed, legible entry form mustNorthwestern University Chicago Campus Martin Luther King Commemoration Art Contest Entry Form 2013

Chisholm, Rex L.

297

OH and HO 2 radical chemistry in a forested region of north-western Greece  

Microsoft Academic Search

This paper explores several aspects of the chemistry of a forested region in north-western Greece, from data collected during the AEROBIC97 campaign. An observationally constrained box model has been constructed to enable comparisons between modelled concentrations of OH and HO2 and those determined by the fluorescence assay by gas expansion (FAGE) technique. These results represent the first comparison of measured

N Carslaw; D. J Creasey; D Harrison; D. E Heard; M. C Hunter; P. J Jacobs; M. E Jenkin; J. D Lee; A. C Lewis; M. J Pilling; S. M Saunders; P. W Seakins

2001-01-01

298

December 1, 2013 To all attendees of the World AIDS Day Symposium at Northwestern,  

E-print Network

to have an HIV-free world, as we mark this 25th Anniversary of World AIDS Day history of the AIDS pandemic whose sole mission is to find a Cure for HIV, the Northwestern HIV Translational Research Center, and the AIDS Foundation of Chicago. I

Engman, David M.

299

Using algal indicators to diagnose nutrient enrichment in the Northwestern Glaciated Plains  

Microsoft Academic Search

The relationships among nutrients, benthic algal community, and aquatic plant biomass were examined in 21 different streams in Montana's Hi-line region, in the Northwestern Glaciated Plains ecoregion. We examined habitat, physical and chemical characteristics, aquatic macrophytes, and benthic algae in the stream segments. Based on multiple lines of evidence, nitrogen was the primary limiting nutrient in the Hi-line region. Correlation

L. Zheng; M. Suplee; J. Gerritsen; V. Watson

2005-01-01

300

Is the Northwestern Decision a Wake-Up Call for Higher Ed Institutions?  

ERIC Educational Resources Information Center

The recent decision by a regional director of the National Labor Relations Board (NLRB) that Northwestern University football players on scholarship are "employees" entitled to unionize under the National Labor Relations Act (NLRA) should serve as a wake-up call for higher education administrators. Part of a trend in which both the NLRB…

Ambash, Joseph W.

2014-01-01

301

Identifying changing climate responses of boreal forest trees in northwestern Canada  

E-print Network

to examine the extent to which apparent divergence of Picea glauca growth in northwestern boreal Canada may of this ongoing research. [1]. Picea glauca growth has an ubiquitous response to summer moisture balance Acknowledgments Tree-ring processing Introduction A network of 32 tree-ring width sites of Picea glauca located

Feigon, Brooke

302

Settling, dissolution and burial of biogenic silica in the sediments off Somalia (northwestern Indian Ocean)  

Microsoft Academic Search

Particle fluxes of biogenic silica through the water column, silica burial fluxes into the sediments, and the flux of dissolved silica across the sediment-water interface estimated from pore water profiles are used to assess the behaviour of biogenic silica at two stations 80 and 270 km offshore along a transect off the Somali coast in the northwestern Indian Ocean. Particulate

Erica Koning; Geert-Jan Brummer; Wim Van Raaphorst; Johan Van Bennekom; Willem Helder; Jolanda Van Iperen

1997-01-01

303

The ventilation of near-bottom shelf waters in the North-Western Black Sea  

E-print Network

The ventilation of near-bottom shelf waters in the North-Western Black Sea Georgy Shapiro, Fred.wobus@plymouth.ac.uk) The state of the Black Sea ecosystem is subject to both anthropogenic and natural impacts and stronger. Ventilation of the Black Sea pycnocline on seasonal and interannual time scales. Mediterr. Mar. Sci., 1/2, 61

Shapiro, Georgy

304

Clinical and epidemiologic observations of bovine viral diarrhea virus in the northwestern United States  

Microsoft Academic Search

Retrospective analyses of cases from which bovine viral diarrhea virus (BVDV) was isolated from 1980 to 2000 were conducted. These cases originated from the northwestern US and included both beef and dairy cattle. The results indicated that there was a shift in diseases associated with BVDV infection and in the animal age at onset of disease. Comparative results from the

James F Evermann; Julia F Ridpath

2002-01-01

305

A possible bedrock source for obsidian found in archeological sites in northwestern Alaska  

USGS Publications Warehouse

Recently discovered deposits of obsidian in the Koyukuk valley may be the long-sought-for source of obsidian found in archeological sites in northwestern Alaska. Obsidian from these deposits compares favorably in physical characteristics and sodium-manganese ratio with the archeological obsidian, and there is evidence that the deposits have been "mined" in the past.

Patton, W.W., Jr.; Miller, T.P.

1970-01-01

306

Upper Mantle Composition Beneath the Petit-Spot Area in Northwestern Pacific: Insights From Electrical Conductivity  

Microsoft Academic Search

The mantle composition beneath the petit-spot area, where is about 500 km offshore from Japan Trench in northwestern Pacific, is discussed through electrical conductivity obtained by seafloor magnetotelluric (MT) survey. The seafloor MT data were collected using ocean bottom electromagnetometers (OBEMs) at four sites with the spacing of 100-150 km, between May and August, 2005. The survey was conducted as

K. Baba; M. Ichiki; N. Abe; N. Hirano

2007-01-01

307

Evidence of uranium biomineralization in sandstone-hosted roll-front uranium deposits, northwestern China  

E-print Network

in the world. D 2004 Elsevier B.V. All rights reserved. Keywords: Roll-front uranium deposit; SandstoneEvidence of uranium biomineralization in sandstone-hosted roll-front uranium deposits, northwestern Available online 25 January 2005 Abstract We show evidence that the primary uranium minerals, uraninite

Fayek, Mostafa

308

BREEDING BIOLOGY OF THE GREAT GRAY OWL IN SOUTHEASTERN IDAHO AND NORTHWESTERN WYOMING  

Microsoft Academic Search

In this study, I documented the existence of a breeding population of Great Gray Owls (Strix nebulosa) in southeastern Idaho and northwestern Wyoming and recorded aspects of this species' breeding biology between 1980 and 1983. Thirty-eight pairs were found; 25 fledged young at least once. Fifteen nests were documented; 40% in old stick nests and 60% on tops of broken-top

ALAN B. FRANKLIN

309

Secondary succession in disturbed and reclaimed sagebrush communities of northwestern Colorado  

Microsoft Academic Search

The objective of this dissertation was the study of natural and induced secondary succession and soil biological activity in disturbed lands and reclaimed areas of a big sagebrush community (Artemisia tridentata) in northwestern Colorado. Four types of treatments were utilized to study soil disturbance effects in secondary succession: 1) vegetation was scraped off with as much topsoil left as possible,

Biondini

1984-01-01

310

NORTHWESTERN UNIVERSITY SystemLevel Optimizations for High Performance DSM Circuits  

E-print Network

NORTHWESTERN UNIVERSITY System­Level Optimizations for High Performance DSM Circuits A DISSERTATION Performance DSM Circuits Jia Wang Process scaling has enabled the production of integrated circuits advances in design automation of high performance DSM circuits for the above challenges. We investigate

Zhou, Hai

311

Agriculture adjustment, land-use transition and protected areas in Northwestern Argentina  

Microsoft Academic Search

Land-use change is the main component of regional environmental change, while protected areas represent a direct land use policy to prevent its potentially negative effects on biodiversity and environmental services. We combined an analysis of trends in land use and human demography with trends in creation of protected areas during the last three decades in northwestern Argentina, a subtropical region

Andrea E. Izquierdo; H. Ricardo Grau

2009-01-01

312

EGG PREDATION BY NORTHWESTERN CROWS: ITS ASSOCIATION WITH HUMAN AND BALD EAGLE ACTIVITY  

Microsoft Academic Search

Predation by Northwestern Crows (Corvus caurinus) on the eggs of Double- crested Cormorants (Phalacrocorax auritus), Pelagic Cormorants (P. pelagicus), Glaucous- winged Gulls (Larus glaucescens), and Pigeon Guillemots (Cepphus columba) was studied in the summers of 1976-1980. Crows took eggs to specific sites on their territories where they ate them and where we counted the shells. In 1980, the crows took

NICOLAAS A. M. VERBELK

313

Natal philopatry and recruitment of willow ptarmigan in north central and northwestern Canada  

Microsoft Academic Search

Natal philopatry and recruitment were measured in two populations of willow ptarmigan; one near Churchill, Manitoba and the other in northwestern British Columbia. We examined the return of tagged offspring in subsequent years with respect to geographical area, annual variation, their age when tagged, their sex, their body weight, age and number of their parents, and time of hatch (first

K. Martin; S. J. Hannon

1987-01-01

314

Northwestern University Archives Evanston, Illinois RAYMOND CARHART (1912-1975) PAPERS, 1938-1975  

E-print Network

in Butler, Pennsylvania until 1946. He then returned to Northwestern where he became Professor of Audiology the post of Head of the Audiology Program from 1953 until shortly before his death. Carhart combined. It was in audiology that Carhart made his major contribution. He popularized the word itself (although he did not coin

315

VISUALIZATION TOOLS FOR AGENT-BASED MODELING IN NETLOGO D. KORNHAUSER,* Northwestern University, IL  

E-print Network

1 VISUALIZATION TOOLS FOR AGENT-BASED MODELING IN NETLOGO D. KORNHAUSER,* Northwestern University technologies in the NetLogo ABM toolkit that improves its design of model visualizations. First, we present primitives and dialogs to improve and expand color handling in NetLogo. After that, we show two feature

Wilensky, Uri

316

DYNAMICS OF HABITAT USE BY SHOREBIRDS IN ESTUARINE AND AGRICULTURAL HABITATS IN NORTHWESTERN CALIFORNIA  

Microsoft Academic Search

We examined shorebird use of mudflats, marsh islands, and nearby agricultural fields near Humboldt Bay in northwestern California between September 1988 and April 1989. Most species used fields for both foraging and roosting, including some species usually considered to be mudflat specialists. After seasonal rains began in late fall, Dunlins (Calidris alpina), Least Sandpipers (Calidris minutilla), Long-billed Curlews (Numenius americanus),

LINDA L. LONG; C. JOHN RALPH

2001-01-01

317

Education, Employment and Empowerment: The Case of a Young Woman in Northwestern China  

ERIC Educational Resources Information Center

As a marginalized region of the world, the rural Gansu Province of northwestern China provides an informative canvas on which to examine and understand the ways in which education contributes to the lives of local Muslim women and supports their goals for work. Specifically, this article highlights the role education plays in the life of one young…

Maslak, Mary Ann

2011-01-01

318

Soil morphological variations on the Taoyuan Terrace, Northwestern Taiwan: Roles of topography and groundwater  

Microsoft Academic Search

To understand whether soils on the same geomorphic surface have similar properties, this study examines the morphology of soils developed on the 30-kyr-old Taoyuan Terrace, Northwestern Taiwan. Relationships among soil morphology, variations in the groundwater table, and soil forming processes were established based on field investigations and previously published datasets. The soil series in the study area can be grouped

Yu-Shih Lin; Yue-Gau Chen; Zueng-Sang Chen; Meng-Long Hsieh

2005-01-01

319

Mortality in Northwestern Bohemia in Periods of High and Low Air Pollution  

Microsoft Academic Search

Air pollution was higher in the industrial area of Northwestern Bohemia during the years 1982 - 1990 than from 1991 to 2000. The aim of the study was to determine whether daily total, cardiovascular (CVD) or respiratory mortality in this area was significantly different during the years 1982 - 1990 compared to the period 1991 - 2000. Poisson regression analyses

Jiri Skorkovsky; Frantisek Kotesovec

320

The effect of plate stresses and shallow mantle temperatures on tectonics of northwestern Europe  

Microsoft Academic Search

Northwestern Europe is tectonically more active, in terms of seismicity, vertical motions and volcanism, than would be expected from its location far from any plate boundaries. In the context of the Netherlands Earth System Dynamics Initiative, we investigated the implications of two recent modeling efforts, of Eurasian plate forces and European mantle structure, for our understanding of the dynamics of

S. Goes; J. J. P. Loohuis; M. J. R. Wortel; R. Govers

2000-01-01

321

Malcolm A. MacIver Department of Biomedical Engineering maciver@northwestern.edu  

E-print Network

, Northwestern University, Evanston IL 2009-present Science consultant for movie and TV industry. Partial list Galactica Prequel series Caprica on SyFy (2010), Tron Legacy (2010) . 2003-2010 Assistant Professor Symposium speaker for American Association for the Advancement of Science session on biologically inspired

Hartmann, Mitra J. Z.

322

Relationship of Sea Surface Temperature Isotherm Patterns off Northwestern Mexico to the Catch of Striped Marlin,  

E-print Network

Relationship of Sea Surface Temperature Isotherm Patterns off Northwestern Mexico to the Catch the distribution of striped marlin and sea surface temperature. Many researchers have reviewed the migration. SST Climatology vs. Striped Marlin Catch Uda (1957) provided a range of sea surface temperatures

323

Global Positioning System (GPS) estimates of crustal deformation in the Marmara Sea region, Northwestern Anatolia  

Microsoft Academic Search

In the Marmara Sea region the relative motion between the Anatolian and Eurasian lithosphere has been measured by means of the modern techniques of space geodesy using the Global Positioning System (GPS). In order to resolve in detail the kinematic field within the active earthquake belts of Northwestern Anatolia, two GPS campaigns were carried out across a dense network consisting

Christian Straub; Hans-Gert Kahle

1994-01-01

324

Research Scholarship, Collaboration, and Outreach at Northwestern University SpRiNg 2012 Centerpiece  

E-print Network

the biomedical sciences as one of Northwestern's focus areas within the Discovery pillar. Because the biomedical--collaboration and interdisciplinarity were key to scientific discovery. #12;CenterPiece | Spring 2012 1 CenterpieceVolume 11, Number 2 develops Alzheimer's disease, the neurons are attacked inside and outside of the cell walls. Abnormal

Shahriar, Selim

325

EVIDENCE FOR 2.45 GA TECTONISM RECORDED in THE NORTH CARIBOU GREENSTONE BELT, NORTHWESTERN ONTARIO  

E-print Network

EVIDENCE FOR 2.45 GA TECTONISM RECORDED in THE NORTH CARIBOU GREENSTONE BELT, NORTHWESTERN ONTARIO.0 Ga to 2.7 Ga, and magmatism is broadly coeval with pervasive deformation and metamorphism. The North Mine are 2.45 Ga. These ages correspond to crustal cooling or a 400-500°C thermal pulse, nearly 300 m

326

American Association of Stratigraphic Palynologists, Inc. Miospores from Upper Cretaceous-Paleocene Strata in Northwestern Bolivia  

E-print Network

-Paleocene Strata in Northwestern Bolivia Author(s): Vivi Vajda-Santivanez Source: Palynology, Vol. 23 (1999), pp VIVIVAJDA-SANTIVANEZ Departmentof Geology Division of HistoricalGeology andPaleontology Lund.Therefore,inordertocontributetothelittle known Cretaceous-Paleocenepalynology of Bolivia, a preliminarystudyof theEslab6nand

Vajda, Vivi

327

The fate and transport of nitrate in shallow groundwater in northwestern Mississippi, USA  

E-print Network

The fate and transport of nitrate in shallow groundwater in northwestern Mississippi, USA Heather L- icals have been presumed minimal. To determine the factors controlling transport of nitrate irrigation well. Nitrate was detected within 4.4 m of the water table but was absent in deeper waters

328

Social and ecological factors influencing vigilance by northwestern crows, Corvus caurinus  

Microsoft Academic Search

Vigilance behaviour is thought to be largely controlled by the threat of predation on foragers. In addition, an inverse relationship between group size and vigilance has been documented repeatedly and is known as the group size effect. We suggest that groups of beach-foraging northwestern crows are vigilant for predators and for opportunities to steal (‘scrounge’) from conspecifics. We collected data

Renee L. Robinette; James C. Ha

2001-01-01

329

Impacts of logging and wildfire on an upland black spruce community in northwestern Ontario  

Microsoft Academic Search

Plant species composition and community structure were compared among four sites in an upland black spruce community in northwestern Ontario. One site had remained undisturbed since the 1930s and three had been disturbed by either logging, fire, or both logging and fire. Canonical correspondence ordination analyses indicated that herbaceous species composition and abundance differed among the disturbance types while differences

M. H. Johnston; J. A. Elliott

1996-01-01

330

CNT-based nanoelectromechanical systems (NEMS) see reliability boost at Northwestern  

E-print Network

for Integrated Nanotechnologies at Sandia and Los Alamos National Laboratories, and Binghamton University have used metal, thin-film electrodes. The Northwestern University group in collaboration with SANDIA reported devices," said Owen Loh, a graduate student in Espinosa's lab. "In this way, we hope the results

Espinosa, Horacio D.

331

Bacillus thuringiensis in caterpillars and associated materials collected from protected tropical forests in northwestern Costa Rica  

Microsoft Academic Search

Bacillus thuringiensis (Bt) synthesizes crystalline inclusions that are toxic to caterpillars (Lepidoptera) and other orders of invertebrates. Materials associated with 37 caterpillars from 16 species, collected while feed- ing on 15 different species of host plants in dry, cloud and rain forests located in the Área de Conservación Guanacaste in northwestern Costa Rica, were examined for the presence of Bt.

César Rodríguez-Sánchez; Ana Sittenfeld; Daniel H. Janzen; Ana M. Espinoza

2006-01-01

332

A STUDY OF THE GOALS AND CHARACTERISTICS OF EXTENSION CREDIT STUDENTS IN NORTHWESTERN MICHIGAN.  

ERIC Educational Resources Information Center

AN ANALYSIS WAS MADE OF THE GOALS AND CHARACTERISTICS OF STUDENTS ENROLLED IN EXTENSION CREDIT COURSES OFFERED BY MICHIGAN STATE UNIVERSITY IN NORTHWESTERN MICHIGAN DURING THE FALL OF 1959. ALSO CONSIDERED WERE DATA ON STUDENT PROBLEMS AND ON CONTACTS AND RELATIONSHIPS WITH THE UNIVERSITY. GROUP ADMINISTERED QUESTIONNAIRES WERE USED TO COLLECT…

HAGELBERG, MILTON JOHN

333

Distribution of cadmium, zinc, copper, and lead in soils of industrial northwestern Indiana  

Microsoft Academic Search

Five undisturbed locations of sandy Oakville and Plainfield soils under oak forest in the heavily industrialized region of northwestern Indiana were sampled at four depths, to assess the nature and extent of Cd, Zn, Cu, and Pb contamination. The litter layer and top 2.5 cm of soil at a site within 5 km of the center of the industrial complex

W. P. Miller; W. W. McFee

1983-01-01

334

Groundwater flow analysis using different geothermal constraints: The case study of Acqui Terme area, northwestern Italy  

Microsoft Academic Search

We review some analytical techniques that use underground thermal data as tracers of groundwater flow. These techniques allow the evaluation of the Darcy velocity in shallow aquifers of mid-low permeability and the evaluation of heat gain\\/loss by conduction in deeper aquifers. Examples of application are then given for the Acqui Terme hydrothermal system, located in the Tertiary Piedmont Basin (northwestern

Vincenzo Pasquale; Massimo Verdoya; Paolo Chiozzi

2011-01-01

335

NORTHWESTERN UNIVERSITY System Design and Verification of the Precession Electron Diffraction Technique  

E-print Network

in series within a circuit, and can be modeled in feedback theory as a single-pole system Pcoil in the series configuration, for example: (A.1) Pcoil = 1 s + 5 . A pole is a factor of s contained withinNORTHWESTERN UNIVERSITY System Design and Verification of the Precession Electron Diffraction

Shull, Kenneth R.

336

Hydrology and water-quality monitoring considerations, Jackpile uranium mine, northwestern New Mexico  

Microsoft Academic Search

The Jackpile Uranium Mine, which is on the Pueblo of Laguna in northwestern New Mexico was operated from 1953 to 1980. The small storage coefficients determined from three aquifer tests indicate that the Jackpile sandstone is a confined hydrologic system throughout much of the mine area. Sediment from the Rio Paguate has nearly filled the Paguate Reservoir near Laguna since

Zehner

1985-01-01

337

Diagnosis of Annosus Root Disease in Mixed Conifer Forests in the Northwestern United States1  

E-print Network

Diagnosis of Annosus Root Disease in Mixed Conifer Forests in the Northwestern United States1 Craig States forests is discussed. Field diagnosis can be made by observing characteristic stand patterns to confirm field diagnosis. Annosus root disease, which is caused by Heterobasidion annosum (Fr.) Bref

Standiford, Richard B.

338

Turin, the main city of the Piedmont region, north-western Italy TEACH ENGLISH  

E-print Network

Turin, the main city of the Piedmont region, north-western Italy TEACH ENGLISH IN ITALY (PIEDMONT is offering a work experience as an intern in Italy to teach English in local high schools. The period varies the opportunity to study in Italy � courses of Italian or in Italian � at the Universita' del Piemonte Orientale

Marques, Oge

339

Carex of Northeastern Illinois and Northwestern Indiana, USA Sedges (Carex spp.) of the Chicago Region  

E-print Network

Carex of Northeastern Illinois and Northwestern Indiana, USA Sedges (Carex spp.) of the Chicago spike tipped w/... 2b. C. pellita BROAD-LEAVED WOOLLY SEDGE: [= C. lanuginosa] plants rhizomatous hairs. Usually dry open woods (e.g. oak savannas). WEB VERSION #12;Carex of Northeastern Illinois

Hipp, Andrew

340

The early impact of adjacent clearcutting and forest re on riparian zone vegetation in northwestern Ontario  

E-print Network

in northwestern Ontario Eric G. Lamba,* , Azim U. Mallika , Robert W. Mackerethb a Department of Biology, Lakehead et al., 1991; Naiman and De�camps, 1997). Riparian zones ®lter and buffer runoff, reducing the volume of sediments, pollutants, and excess nutrients entering the stream (Norris, 1993; Naiman and De�camps, 1997

Mallik, Azim U.

341

BIOMEDICAL ENGINEERING AT NORTHWESTERN Christina Enroth-Cugell, Lyle F. Mockros, and Robert A. Linsenmeier  

E-print Network

BIOMEDICAL ENGINEERING AT NORTHWESTERN 1969-1999 Christina Enroth-Cugell, Lyle F. Mockros, and Robert A. Linsenmeier The seeds for biomedical engineering were planted in the 1950s by the pioneering. In the beginning of the 1960's the University administration had supported biomedical engineering in the form

MacIver, Malcolm A.

342

GENETIC STRUCTURE OF SENSITIVE AND ENDANGERED NORTHWESTERN BADGER POPULATIONS (TAXIDEA TAXUS TAXUS AND T. T. JEFFERSONII)  

Microsoft Academic Search

American badgers (Taxidea taxus) are semifossorial carnivores present in many arid regions of central and western North America. Negative demographic trends have prompted recent discussion concerning their conservation status in the northwestern portion of their range. As such, further information regarding the metapopulation structure of this species and factors affecting dispersal is needed. To provide a preliminary assessment of genetic

Christopher J. Kyle; Richard D. Weir; Nancy J. Newhouse; Helen Davis; Curtis Strobeck

2004-01-01

343

Paleogeography of the Norwegian-Greenland and Northwestern European Sea Basins in the Paleogene  

Microsoft Academic Search

Published and original data on the lithology and fauna (mainly foraminifers) of the Paleogene Norwegian-Greenland and Northwestern European Sea Basins are generalized in this article. Their paleogeographic evolution and the character of development of connections with the North Atlantic, Mesotetis, and the Arctic Ocean are established from the moment of generation to their disappearance. It is shown that the paleogeographic

G. S. Kharin; N. P. Lukashina

2010-01-01

344

Wind prospecting study for Western Massachusetts and Northwestern Connecticut. Phase III. Volume I  

Microsoft Academic Search

Summaries of a wind energy project cover the March 1, 1981 to January 31, 1983 data on wind speed for several sites in Northwestern Connecticut and Western Massachusetts. There is also an extensive analysis describing the manner in which wind speed increases with height above ground level (wind shear) at two sites. The project examined wind shear as a function

F. C. Kaminsky; R. H. Kirchhoff

1983-01-01

345

Implementation of a siting methodology for utility size WECS in western Massachusetts and northwestern Connecticut  

Microsoft Academic Search

This paper describes a long term research project by Northeast Utilities and the University of Massachusetts to identify candidate sites for utility size wind energy systems in Western Massachusetts and Northwestern Connecticut. A generalized methodology is described for identifying the candidate sites. This methodology includes the use of biological wind prospecting, data collection with TALA kites, computerized wind mapping with

R. H. Kirchhoff; F. C. Kaminsky

1981-01-01

346

Wind prospecting study for Western Massachusetts and Northwestern Connecticut. Final report. Phase II  

Microsoft Academic Search

The final report on Phase II of the study continues the effort to develop and test a way to identify sites in Western Massachusetts and Northwestern Connecticut that have a high potential for generating electrical energy from a wind energy conversion system. The data cover January 1, 1980 to March 1, 1981, and concentrates on four major areas: the establishment

F. C. Kaminsky; R. H. Kirchhoff

1981-01-01

347

Trends in streamflow and rainfall in tropical South America: Amazonia, eastern Brazil, and northwestern Peru  

Microsoft Academic Search

Long hydrological records, from the Amazon Basin, northeastern Brazil, and northwestern Peru spanning most of this century, are examined for trends in rainfall (three wettest months) and runoff (three months of highest flow) or stage, where no rating curves exist. Trends are tested for significance using the Mann-Kendall statistic. In basins where large soil, aquifer, or man-made reservoirs give rise

José A. Marengo; Javier Tomasella; Cintia R. Uvo

1998-01-01

348

Production of carbonate particles by phytobenthic communities on the Mallorca-Menorca shelf, northwestern Mediterranean Sea  

Microsoft Academic Search

In this paper the carbonate content and production, both at the species level and at the community level, is quantified in four areas of the Mallorca-Menorca shelf, northwestern Mediterranean Sea. Eight benthic communities are identified, each living at specific depth ranges and preferentially colonising either rocky or sedimented soft bottoms: (1) Photophilic algae, (2) Hemisciaphilic algae, (3) Coralligenous algal-dominated, (4)

M. Canals; E. Ballesteros

1997-01-01

349

Memory Consolidation: Systems K A Paller, Northwestern University, Evanston, IL, USA  

E-print Network

Memory Consolidation: Systems K A Paller, Northwestern University, Evanston, IL, USA ã 2009 Elsevier Ltd. All rights reserved. The Consolidation of a Memory At the moment when we perceive an event, the jour- ney of memory storage begins. In a sense, such an event may exist for many years before finally

Paller, Ken

350

Nitrate, non-sea-salt sulfate, and mineral aerosol over the northwestern Indian Ocean  

Microsoft Academic Search

Bulk aerosol data collected from January 14-June 1, 1979 aboard three ships in the northwestern Indian Ocean are examined in order to calculate the atmospheric concentrations of nitrate, nonsea-salt sulfate (NSS), mineral aerosol, and NSS calcium. The samples are divided into three sets based on geographical location, mineral aerosol concentration, and wind regime. The relation between nitrate and NSS sulfate

D. L. Savoie; J. M. Prospero; R. T. Nees

1987-01-01

351

DEPARTMENT OF PHYSICAL THERAPY AND HUMAN MOVEMENT SCIENCES NORTHWESTERN UNIVERSITY FEINBERG SCHOOL OF MEDICINE  

E-print Network

DEPARTMENT OF PHYSICAL THERAPY AND HUMAN MOVEMENT SCIENCES NORTHWESTERN UNIVERSITY FEINBERG SCHOOL OF MEDICINE Benefits for Physical Therapy Clinical Educators To recognize the contribution of clinical evidence. The Department of Physical Therapy and Human Movement Sciences (PTHMS) will reimburse the Center

Contractor, Anis

352

Reproductive Ecology of Pseudemys floridana and Trachemys scripta (Testudines: Emydidae) in Northwestern Florida  

Microsoft Academic Search

The Cooter, Pseudemys floridana, and the Pond Slider, Trachemys scripta, are two abundant freshwater turtles in the southeastern United States, but little is known of their reproductive ecology in northwestern Florida. I studied their nesting phenology and behavior, clutch size and frequency, rates of nest predation, and hatchling overwintering behavior from 2001-2003 at Lake Jackson, Leon County, Florida. Both species

Matthew J. Aresco

2004-01-01

353

Transition in the Cause of Fever from Malaria to Dengue, Northwestern Ecuador, 1990-2011  

PubMed Central

In tropical areas, the predominant cause of fever has historically been malaria. However by 2011, among febrile patients in northwestern Ecuador, dengue was identified in 42% and malaria in none. This finding suggests a transition in the cause of fever from malaria to other illnesses, such as dengue. PMID:24047566

Cifuentes, Sara G.; Trostle, James; Trueba, Gabriel; Milbrath, Meghan; Baldeon, Manuel E.; Coloma, Josefina

2013-01-01

354

CURRICULUM VITAE History Department, Northwestern University, 1881 Sheridan Rd. #202, Evanston, IL 60208  

E-print Network

, Providence, Rhode Island, A.B., Modern Culture & Media; History SELECTED GRANTS AND FELLOWSHIPS ACLS War History, 56, no. 2 (June 2010), 117-144. "Civil, Political, and Social Equality: A ParadigmCURRICULUM VITAE KATE MASUR History Department, Northwestern University, 1881 Sheridan Rd. #202

Mohseni, Hooman

355

SEASONAL AND SPATIAL CHANGES IN FLEA COMMUNITIES OF BLACK-TAILED PRAIRIE DOGS OF NORTHWESTERN MEXICO  

E-print Network

SEASONAL AND SPATIAL CHANGES IN FLEA COMMUNITIES OF BLACK-TAILED PRAIRIE DOGS OF NORTHWESTERN, but was scarcer in wetter/cooler seasons (Fig. 3) Abstract. Plague is often referred to as one of the main causes of mortality in prairie dog populations. In Mexico, plague has never been reported in prairie dogs despite

Nacional Autónoma de México, Universidad

356

Origin and pathways of Winter Intermediate Water in the Northwestern Mediterranean Sea using observations and numerical simulation  

NASA Astrophysics Data System (ADS)

The study of water masses worldwide (their formation, spreading, mixing, and impact on general circulation) is essential for a better understanding of the ocean circulation and variability. In this paper, the formation and main pathways of Winter Intermediate Water (WIW) in the Northwestern Mediterranean Sea (NWMED) are investigated during the winter-spring 2011 using observations and numerical simulation. The main results show that the WIW, formed along the continental shelves of the Gulf of Lion and Balearic Sea, circulates southward following five preferential pathways depending on the WIW formation site location and the oceanic conditions. WIW joins the northeastern part of the Balearic Sea, or flows along the continental shelves until joining the Balearic Current (maximum of 0.33 Sv in early-April) or further south until the Ibiza Channel entrance. Two additional trajectories, contributing to water mass exchanges with the southern part of the Western Mediterranean Sea, bring the WIW through the Ibiza and Mallorca Channels (maxima of 0.26 Sv in late-March and 0.1 Sv in early-April, respectively). The circulation of WIW over the NWMED at 50-200 m depth, its mixing and spreading over the Western Mediterranean Sea (reaching the south of the Balearic Islands, the Algero-Provencal basin, the Ligurian and the Alboran Seas) suggest that the WIW may have an impact on the ocean circulation by eddy blocking effect, exchange of water masses between north and south subbasins of Western Mediterranean Sea through the Ibiza Channel or modification of the ocean stratification.

Juza, Mélanie; Renault, Lionel; Ruiz, Simon; Tintoré, Joaquin

2013-12-01

357

Canopy storage capacity of xerophytic shrubs in Northwestern China  

NASA Astrophysics Data System (ADS)

SummaryThe capacity of shrub canopy water storage is a key factor in controlling the rainfall interception. Thus, it affects a variety of hydrological processes in water-limited arid desert ecosystems. Vast areas of revegetated desert ecosystems in Northwestern China are occupied by shrub and dwarf shrub communities. Yet, data are still scarce regarding their rainwater storage capacity. In this study, simulated rainfall tests were conducted in controlled conditions for three dominant xerophytic shrub types in the arid Tengger Desert. Eight rainfall intensities varying from 1.15 to 11.53 mm h-1 were used to determine the canopy water storage capacity. The simulated rainfall intensities were selected according to the long-term rainfall records in the study area. The results indicate that canopy storage capacity (expressed in water storage per leaf area, canopy projection area, biomass, and volume of shrub respectively) increased exponentially with increase in rainfall intensity for the selected shrubs. Linear relationships were found between canopy storage capacity and leaf area (LA) or leaf area index (LAI), although there was a striking difference in correlation between storage capacity and LA or LAI of Artemisia ordosica compared to Caragana korshinskii and Hedysarum scoparium. This is a result of differences in biometric characteristics, especially canopy morphology between the shrub species. Pearson correlation coefficient indicated that LA and dry biomass are better predictors as compared to canopy projection area and volume of samples for precise estimation of canopy water storage capacity. In terms of unit leaf area, mean storage capacity was 0.39 mm (range of 0.24-0.53 mm), 0.43 mm (range of 0.28-0.60 mm), and 0.61 mm (range of 0.29-0.89 mm) for C. korshinskii, H. scoparium, and A. ordosica, respectively. Correspondingly, divided per unit dry biomass, mean storage capacity was 0.51 g g-1 (range of 0.30-0.70 g g-1), 0.41 g g-1 (range of 0.26-0.57 g g-1), and 0.73 g g-1 (range of 0.38-1.05 g g-1) for C. korshinskii, H. scoparium, and A. ordosica, respectively, when the rainfall intensities ranged from 1.15, 2.31, 3.46, 4.61, 6.92, 9.23 to 11.53 mm h-1. The needle-leaved species A. ordosica had a higher canopy water storage capacity than the ovate-leaved species C. korshinskii and H. scoparium at the same magnitude of rainfall intensity, except for C. korshinskii when it was expressed in unit of canopy projection area. Consequently, A. ordosica will generate higher interception losses as compared to C. korshinskii and H. scoparium. This is especially the case as it often forms dense dwarf shrub communities despite its small size.

Wang, Xin-ping; Zhang, Ya-feng; Hu, Rui; Pan, Yan-xia; Berndtsson, Ronny

2012-08-01

358

Cenozoic orogenic phases in the northwestern framing of the Pacific  

NASA Astrophysics Data System (ADS)

Several Cenozoic orogenic phases marked by deformations and rearrangement of geological structures, by unconformities and hiatuses, and by the cyclicity of ancient sedimentary and volcanic formations are distinguished in the vast territory of a transitional zone between Northeast Asia and the Pacific, from Sakhalin in the south to Chukotka in the north.

Gladenkov, Yu. B.

2013-07-01

359

The Corossol structure: A possible impact crater on the seafloor of the northwestern Gulf of St. Lawrence, Eastern Canada  

NASA Astrophysics Data System (ADS)

We report on a 4.1 (±0.2) km diameter and 185 m deep circular submarine structure exposed on the seabed in >40 m water depths in the northwestern Gulf of St. Lawrence (Eastern Canada) from the analysis of high-resolution multibeam bathymetric and seismic data. The presence of a circular form characterized by a central uplift and concentric rings resembles the morphology and geometry of complex meteorite impact structures. Also, other origins, such as kimberlites, intrusions, karsts, or diapirs, can be eliminated on geological criteria. A single 4 cm long breccia fragment recovered from the central uplift has numerous glassy droplets of fluorapatite composition, assumed to be impact melts, and a single quartz grain with planar intersection features thought to be shock-induced planar deformation features (PDFs). The absolute age of this possible impact structure is unknown, but its geological setting indicates that it was formed long after the Mid-Ordovician and before regional pre-Quaternary sea-level lowstands. Present results outline the need for further examination to confirm an impact origin and to precisely date the formation of the structure.

Lajeunesse, Patrick; St-Onge, Guillaume; Locat, Jacques; Duchesne, Mathieu J.; Higgins, Michael D.; Sanfaçon, Richard; Ortiz, Joseph

2013-12-01

360

Hiatus-related processes: Paleokarst, paleosol, and a transgressive rocky shore from the Mississippian-Pennsylvanian unconformity in northwestern Arkansas  

SciTech Connect

Unconformities are often considered only as stratigraphic gaps or sequence boundaries despite the evidence of climate- and paleogeography-linked hiatus processes that they may preserve. In northwestern Arkansas, progressively older Paleozoic strata are truncated to the north and west by the Mississippian-Pennsylvanian unconformity. In southern Washington County, Arkansas, the partly truncated Chesterian Pitkin Limestone is unconformably overlain by the Cane Hill Member of the Morrowan Hale Formation. The top of the Pitkin Limestone locally consists of cryptokarst with abundant solution pipes and lithoclasts formed by dissolution fragmentation. These lithoclasts, and surrounding clay dissolution residue, form regolith that is increasingly altered by pedogenic calcretization towards the top. The basal conglomerate of the overlying Cane Hill Member is interpreted as a transgressive boulder shore deposit. Conglomerate clasts consist of Pitkin cobbles and boulders that were derived from the erosion of local Pitkin highs.'' Most clasts are heavily bored on all sides by a variety of Trypanites and acrothoracian barnacle borings. Encrusting bryozoans and the encrusting tabulate coral, Michelinia, complete the rocky shore fauna. Preservation of paleokarst and poorly-indurated paleosol in low-lying areas around the eroded Pitkin highs,'' suggests that: (1) the vast majority of missing Pitkin was removed from the section by karstification during the hiatus, and not by erosion during the subsequent transgression; (2) transgression was too rapid to effectively scour the transgressed surface to bed rock; and (3) the net nearshore sediment transport direction was shoreward as the sea transgressed.

Webb, G.E. (Texas A and M Univ., College Station, TX (United States). Dept. of Geology)

1992-01-01

361

A deep water turbidity origin for the Altuda Formation (Capitanian, Permian), Northwest Glass Mountains, Texas  

USGS Publications Warehouse

The Altuda Formation (Capitanian) in the northwestern Glass Mountains is comprised of thin, even bedded limestones, dolostones, mixed clastic-carbonates, and silt/sandstones interbedded with basin-ward dipping wedge-shaped clinoforms of the Captian Limestone. The formation is characterized by graded bedding, planar laminations, flame structures, contorted/convolute bedding, horizontal branching burrows, and shelf-derived normal marine fauna. A detailed study of the Altuda Formation north of Old Blue Mountain, Glass Mountains, reveals that the formation in this area was deposited by turbidity currents in slope to basinal settings.

Haneef, Mohammad; Rohr, D.M.; Wardlaw, B.R.

2000-01-01

362

33 CFR 165.1301 - Puget Sound and Adjacent Waters in Northwestern Washington-Regulated Navigation Area.  

Code of Federal Regulations, 2013 CFR

33 Navigation and Navigable Waters 2 2013-07-01 2013-07-01 false Puget Sound and Adjacent Waters in Northwestern Washington-Regulated...165.1301 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF...

2013-07-01

363

33 CFR 165.1301 - Puget Sound and Adjacent Waters in Northwestern Washington-Regulated Navigation Area.  

Code of Federal Regulations, 2011 CFR

33 Navigation and Navigable Waters 2 2011-07-01 2011-07-01 false Puget Sound and Adjacent Waters in Northwestern Washington-Regulated...165.1301 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF...

2011-07-01

364

33 CFR 165.1301 - Puget Sound and Adjacent Waters in Northwestern Washington-Regulated Navigation Area.  

33 Navigation and Navigable Waters 2 2014-07-01 2014-07-01 false Puget Sound and Adjacent Waters in Northwestern Washington-Regulated...165.1301 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF...

2014-07-01

365

33 CFR 165.1301 - Puget Sound and Adjacent Waters in Northwestern Washington-Regulated Navigation Area.  

Code of Federal Regulations, 2012 CFR

33 Navigation and Navigable Waters 2 2012-07-01 2012-07-01 false Puget Sound and Adjacent Waters in Northwestern Washington-Regulated...165.1301 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF...

2012-07-01

366

"Northwestern brings together some of the most talented students in the nation, and that makes every day a  

E-print Network

tutoring children in the local schools, will find encouragement at Northwestern to feed every dimension characterize the undergraduate student body, the word we use most often is diverse. Our undergraduates come

367

Northwestern University Archives Evanston, Illinois Melvin A. Pingree (1845-1866) Photograph Album, circa 1865-1866  

E-print Network

secretary to James Harlan, then Andrew Johnson's Secretary of the Interior. Pingree died of yellow fever of typhoid fever on July 10, 1864, barely two months after enlisting. 6 Unknown Unmarked N/A #12;Northwestern

368

A quantitative study of fish populations associated with a platform within Buccaneer Oil Field, northwestern Gulf of Mexico  

E-print Network

A QUANTITATIVE STUDY OF FISH POPULATIONS ASSOCIATED WITH A PLATFORM WITHIN BUCCANEER OIL FIELD, NORTHWESTERN GULF OF MEXICO A Thesis by RUSSELL EUGENE PUTT, JR. Submitted to the Graduate College of Texas A&M University in partial fulfillment... of the requirement for the degree of MASTER OF SCIENCE August 1982 Major Subject: Oceanography A QUANTITATIVE STUDY OF FISH POPULATIONS ASSOCIATED WITH A PLATFORM WITHIN BUCCANEER OIL FIELD, NORTHWESTERN GULF OF MEXICO A Thesis by RUSSELL EUGENE PUTT, JR...

Putt, Russell Eugene

2012-06-07

369

The Hei River Basin in northwestern China - tectonics, sedimentary processes and pathways  

NASA Astrophysics Data System (ADS)

The Hei River Basin (catchment area of c. 130,000 km²) is situated at the transition between the northern margin of the Tibetan Plateau and the southern slopes of Gobi-Tien-Shan. As part of the northwestern Chinese deserts, the Ejina Basin (Gaxun Nur Basin) constitutes the endorheic erosion base of the drainage system. The basin - hosting the second largest continental alluvial fans in the world, is tectonically strongly shaped by the Gobi belt of left-lateral transpression. The tectonic setting in combination with competing climatic driving forces (Westerlies and summer/winter monsoon currents) has supported the formation of a valuable long-time sediment archive comprises at least the last 250,000 yrs. of deposition. It is composed by the interplay of eolian, fluvial and lacustrine sedimentation cycles and today is dominated by widespread (gravel) gobi surfaces, insular dune fields and shallow evaporitic playa areas. Thus, it provides excellent conditions to investigate tectonic evolution and Quaternary environmental changes. Recently, geomorphological, geophysical, neotectonic and mineralogical studies have enhanced the understanding of the environmental history and the modern depositional environment. Moreover, the role of the Hei River Basin as an important source area of silt particles which were later deposited on the Chinese Loess Plateau is evaluated. Therefore, a 230 m long drill core, sediment sections and ca. 700 surface samples throughout the whole catchment and basin were analyzed. Instrumental and historical seismicity are very low, but the proximity to active fault zones and dating irregularities in earlier publications indicate evidence for deformation in the study area. Despite flat topography, indications of active tectonics such as fault-related large-scale lineations can be observed. Seismically deformed unconsolidated lacustrine deposits (seismites), presumably of Holocene age, are evident and must be related to the nearby faults. The upper catchment is represented by the Qilian Shan mountain range and its immediate foreland. Here, a tripartite altitudinal distribution of terrestrial sediment archives is evident, which is representative of catchment-wide sedimentological processes. Insights into their formation mechanisms, therefore, add valuable perspective regarding the reconstruction of sedimentological and paleoenvironmental conditions in the depositional area of the Hei River Basin. For the characterization of provenance and dispersal of Quaternary sediments in relation to the modern depositional environment, over 200 surface samples from the whole catchment were analyzed using XRD and XRF measurements on the clay fractions, heavy minerals and bulk sediments. The clay mineral results in-particular show that it is possible to discriminate between the chlorite rich metamorphic sediments originating from greenschist bearing rocks in the Qilian Shan Mountain Range in the south, and the more intrusive rocks from the Bei Shan Mountain Range west of the Hei River Basin. Additionally, these two main sources reflect different transportation processes; the Qilian Shan sediments are mainly transported by the rivers Heihe and Beida He, and the deposition of the Bei Shan sediments is mainly driven by wind or local runoff. Grain size results of primary loess deposits indicate different eolian transport pathways, i.e., far-travelled dust input (medium silty) vs. local deflation from active fluvial channels (fine sandy). Along the altitudinal transect, the varying geomorphological settings exert a significant influence on the grain size composition showing an increased contribution of far-travelled dust at higher altitudes.

Rudersdorf, Andreas; Nottebaum, Veit; Schimpf, Stefan; Yu, Kaifeng; Hartmann, Kai; Stauch, Georg; Wünnemann, Bernd; Reicherter, Klaus; Diekmann, Bernhard; Lehmkuhl, Frank

2014-05-01

370

Seasonal gravity wave drags on the upper stratosphere due to the northwestern pacific typhoons  

NASA Astrophysics Data System (ADS)

In a recent study of the first author and his co-authors (Zeyu Chen, Peter Preusse, Michael Jarisch, Manfred Ern, and Dirk Offermann, 2003), it has been revealed that a northwestern Pacific typhoon can generate stratospheric gravity waves with the horizontal scales ranging from 500 km ˜ 1000 km, and carrying a magnitude of ˜ 0.001 Pascal of momentum flux into the upper stratosphere Statistics indicates that the annual mean number of typhoon in the northwestern Pacific is about 32, most of them happen in summer. In this presentation, we show that a parameterization scheme is developed to derive the magnitude of the momentum flux of the waves from operational satellite observations that can scale the intensity of a typhoon (e.g. the brightness temperature observations from the GMS-5 satellite), and operational meteorological data analysis. The seasonal effect of the Gravity Wave Drags due to the typhoons in the area is derived.

Chen, Zeyu; Lu, Daren

371

Immunity to diphtheria among children in Northern Norway and North-Western Russia  

Microsoft Academic Search

In 1990, diphtheria re-emerged in Russia and during the following four-year period the resulting epidemic reached all the Newly Independent States (NIS) of the former Soviet Union. Several neighbouring countries of NIS, Norway included, have experienced sporadic imported cases. A sero-epidemiological study among children in Northern Norway and North-Western Russia was performed in order to evaluate protection against diphtheria and

Vegard Skogen; Pål A. Jenum; Elena Danilova; Vera N. Koroleva; Dag S. Halvorsen; Haakon Sjursen

2000-01-01

372

The oceanic crustal structure of the Northwestern Subbasin in the South China Sea  

NASA Astrophysics Data System (ADS)

The oceanic crustal structure of the Northwestern Sub-basin (NWSB) area in the South China Sea (SCS) was inverted using wide-angle seismic survey line data across the entire region and on both sides of its bounding continental margin. The survey line extended 484 km in length. A total of 14 Ocean Bottom Seismometers (OBS) were deployed at intervals of 30 km, with a volume of the combined gun array of 5160 in3. The crustal velocity structure of the northwestern sub-basin area was acquired through integration of multi-channel seismic data. OBS data were processed and modeled initially using ray tracing inversion techniques. Results indicate that crustal thickness under the continental slope decreases from 21 km to 11 km, crustal thickness of NWSB is 7.7 km, and the depth to the Moho ascends from 21 km under the upper continental slope to 11 km under the middle basin. The oceanic crustal structure of NWSB is similar to that the Eastern Sub-basin (ESB). This oceanic structure has a thicker layer 1 (sedimentary layer) and thinner layer 2. These characteristics are especially clear in ESB, which differs somewhat from typical oceanic crustal structure. Because the seafloor spreading period of the northwestern sub-basin was short, layer 2 might have experienced asymmetrical basalt magma flows, which may have blurred the magnetic anomaly lineations of the northwestern sub-basin. By comparing with the oceanic crustal structure of the OBS survey line near Liyue Bank, we suggest that these two lines could be conjugate pair. Acknowledgements This study was supported by the National Key Basic Research Project of China (Grant No. 2007CB411701), Scientific Research Fund of the Second Institute of Oceanography, SOA(Grant No. JT1101), Key Laboratory of Marginal Sea Geology, Chinese Academy of Sciences (Grant No.MSGL09-07).

Wu, Z.; Li, J.; Ruan, A.; Ding, W.; Zhang, T.; Niu, X.

2011-12-01

373

Methane-derived carbonates and authigenic pyrite from the northwestern Black Sea  

Microsoft Academic Search

Methane seeps in the northwestern Black Sea are accompanied by carbonate and pyrite precipitates. Sediments were sampled at locations on the Romanian (120m depth) and Ukrainian (180–200m depth) shelf and slope. Layered carbonate crusts are formed of (i) carbonate-cemented siliciclastic sediment containing dreissenoid bivalves, (ii) microcrystalline high-Mg-calcite or aragonite, and (iii) aragonitic cement. The Dreissena sediment is subrecent and was

J Peckmann; A Reimer; U Luth; C Luth; B. T Hansen; C Heinicke; J Hoefs; J Reitner

2001-01-01

374

NEST-SITE CHARACTERISTICS OF HAMMOND'S AND PACIFIC SLOPE FLYCATCHERS IN NORTHWESTERN CALIFORNIA1  

Microsoft Academic Search

Thirty nests of Hammond's (Empidonax hammondii) and 88 nests of Pacific- slope (E. difficilis) Flycatchers were located in different-aged Douglas-fir (Pseudotsuga men- ziesii)\\/tanoak (Lithocarpus densiflorus) dominated forests at 12 study sites in northwestern California during the breeding seasons of 1984, 1985, 1987, and 1988. In contrast to Pacific- slope Flycatchers, Hammond's used nest trees that averaged two to three times

HOWARD F. SAKAI; BARRY R. NOON

375

DDT and its metabolites in western gull eggs from Southern California and Northwestern Baja California  

Microsoft Academic Search

Historically, islands off the Northwestern coast of Baja California hosted large breeding colonies of seabirds. Three decades ago DDT and DDE achieved such high levels in the region as to cause reproductive failure of brown pelicans (Pelecanus occidenta\\/is; Jehl 1973, Anderson et el. 1975) and double-crested cormorants (Phalacrocorax auritus; Gress et el. 1973). In 1981-82 pintails (Anas acute) collected in

C. Jimenez-Castro; E. Mellink; J. Villaescusa-Celaya

1995-01-01

376

Children, adolescents and young adults suicide data from Epirus, northwestern Greece  

Microsoft Academic Search

The aim of this study was to evaluate suicide trends among individuals ? 24 years of age in the region of Epirus, northwestern\\u000a Greece, from January 1998 to December 2008. Twenty-one cases were classified as suicides out of 242 total deaths (8.7%). The\\u000a male to female suicide ratio was 4.25 (17 males and 4 females). The preferred suicide method for those aged ? 19 years involved

Theodore Vougiouklakis; Christina Tsiligianni; Vassiliki A. Boumba

2009-01-01

377

Danube River Sediment Input and its Interaction with the North-western Black Sea  

Microsoft Academic Search

The influence of the river Danube is determinant to the sedimentation of the north-western and western Black Sea area. After 1970, following the building of the Iron Gates dam, the Danube River sediment discharge diminished to 30–40% of its previous value. After a 12000-year evolution, marked by active progradation, the Danube delta has become mainly inactive over the last few

N. Panin; D. Jipa

2002-01-01

378

Geology of Sedimentary Rock-Hosted Disseminated Gold Deposits in Northwestern Sichuan, China  

Microsoft Academic Search

Sixteen sedimentary rock-hosted disseminated gold deposits (e.g., Dongbeizhai, Qiuluo, Manaoke, Laerma, Gala and Lianhecun) and about 50 prospects have been discovered in northwestern Sichuan Province, China since the late 1970s. They are hosted in complex rock series such as fine-grained clastic rocks, subvolcanic rocks, and ophiolitic melange, mainly of Triassic age. Mineral associates include pyrite, arsenopyrite, marcasite, realgar, orpiment, stibnite,

Xiao-Chun Wang; Zhe-Ru Zhang

2001-01-01

379

Morphological analysis of alpine communities of the north-western Caucasus  

Microsoft Academic Search

The species composition of four alpine communities in the north-western Caucasus was subjected to a morphological analysis.\\u000a The communities are an alpine lichen heath type (ALH), aFestuca varia grassland type (FVG), aGeranium-Hedysarum meadow type (GHM) and a snowbed community (SBC). Eighty-two species were studied, using the following morphological parameters:\\u000a vegetative mobility, presence of rosettes, architectural model, life form according toRaunkiaer

Galina A. Pokarzhevskaya

1995-01-01

380

Iodine speciation in the northwestern Mediterranean Sea, method and vertical profile  

Microsoft Academic Search

Iodine speciation analysis was carried out upon seawater samples collected in July 1993 at the Dyfamed station (43 °25?N, 7 °52?E) located in the northwestern Mediterranean Sea. Dissolved iodate and iodide were directly determined by differential pulse polarography and cathodic stripping square wave voltammetry, respectively, and organically bound iodine was estimated by wet-chemical oxidation with sodium hypochlorite.Iodate is the predominant

R. C. Tian; E. Nicolas

1995-01-01

381

Seasonal Variations in Currents and Water Properties in Northwestern Baffin Bay, 1978-1979  

Microsoft Academic Search

Year-long records of current speed and direction, temperature and conductivity were obtained from five current meter moorings in northwestern Baffin Bay. Significant seasonal changes in all these parameters were found, which closely followed the seasonal cycle of sea-ice cover. A general winter weakening of the near-surface currents (by a factor of 2 or more) was observed. Deeper currents exhibited a

D. D. LEMON; D. B. FISSEL

382

Spicing up life in northwestern Europe: exotic food plant imports in the Roman and medieval world  

Microsoft Academic Search

This research investigates the introduction and trade of numerous exotic food plants across northwestern Europe during the\\u000a Roman and medieval periods. Data were collected from all available archaeobotanical records on taxa that cannot grow in the\\u000a study area or which require considerable efforts for their cultivation, together with relevant archaeological information\\u000a (date, site type, context, status) to put the results

Alexandra Livarda

2011-01-01

383

The Evolution of the Perdido Fold Belt, Northwestern Gulf of Mexico - Insights from Numerical Modeling  

Microsoft Academic Search

The Perdido Fold Belt (PFB) in the northwestern Gulf of Mexico is a large deep-water salt-tectonic structure. It is located above the seaward limit of the Jurassic Louann salt and lies within the compressional domain of a salt tectonic continental margin system. The PFB is well documented in several geophysical surveys and deep-water hydrocarbon discoveries associated with this structure have

S. Gradmann; C. Beaumont

2007-01-01

384

Population genetic structure of the point-head flounder, Cleisthenes herzensteini , in the Northwestern Pacific  

Microsoft Academic Search

Intraspecific phylogenies can provide useful insights into how populations have been shaped by historical and contemporary\\u000a processes. To determine the population genetic structure and the demographic and colonization history of Cleisthenes herzensteini in the Northwestern Pacific, one hundred and twenty-one individuals were sampled from six localities along the coastal regions\\u000a of Japan and the Yellow Sea of China. Mitochondrial DNA

Yongshuang Xiao; Yan Zhang; Takashi Yanagimoto; Jun Li; Zhizhong Xiao; Tianxiang Gao; Shihong Xu; Daoyuan Ma

2011-01-01

385

Identification and molecular characterization of Theileria sp. infecting red deer ( Cervus elaphus ) in northwestern Poland  

Microsoft Academic Search

Piroplasms from Theileria genus were detected in blood and spleen of red deer Cervus elaphus culled during the months of September 2004–January 2005 in northwestern Poland. The polymerase chain reaction revealed the\\u000a presence of Theileria deoxyribonucleic acid in 88% (36 of 41) of the animals examined. Molecular characterization of the parasites based on large\\u000a piece of 18S ribosomal ribonucleic acid

Marek Sawczuk; Agnieszka Maciejewska; Bogumi?a Skotarczak

2008-01-01

386

Time-series observation of POC fluxes estimated from 234Th in the northwestern North Pacific  

Microsoft Academic Search

Time-series measurements of 234Th activities and particulate organic carbon (POC) concentrations were made at time-series stations (K1, K2, K3, and KNOT) in the northwestern North Pacific from October 2002 to August 2004. Seasonal changes in POC export fluxes from the surface layer (?100m) were estimated using 234Th as a tracer. POC fluxes varied seasonally from approximately 0 to 180mgCm?2d?1 and

Hajime Kawakami; Makio C. Honda

2007-01-01

387

Population genetic structure of the neon damselfish ( Pomacentrus coelestis ) in the northwestern Pacific Ocean  

Microsoft Academic Search

The population genetic structure of the neon damselfish (Pomacentrus coelestis) in the northwestern Pacific Ocean was revealed by the hypervariable control region of the mitochondrial gene (343 bp). In\\u000a total, 170 individuals were sampled from 8 localities distributed between Taiwan and Japan, and 71 haplotypes were obtained\\u000a through sequence alignment. High haplotype diversity (h = 0.956 ± 0.008) with low nucleotide diversity (? = 0.010 ± 0.006) was observed,

Shang-Yin V. Liu; Tomoyuki Kokita; Chang-Feng Dai

2008-01-01

388

“Berry Patch” As a Kind of Place—the Ethnoecology of Black Huckleberry in Northwestern Canada  

Microsoft Academic Search

The Gitksan and Wet’suwet’en of Northwestern British Columbia formerly used landscape burning to manage patches of black huckleberry\\u000a (Vaccinium membranaceum), the most important plant resource of their seasonal round. In view of its significance one might postulate that managed\\u000a sites would conform to a biophysical or ecological type to maximize return for effort. However, a survey of a number of

Scott Trusler; Leslie Main Johnson

2008-01-01

389

The flavonoid glycosides of Cornus canadensis L. and its allies in Northwestern North America  

Microsoft Academic Search

Summary The flavonoid glycoside profile ofCornus canadensis L. and its allies in Northwestern North America has been determined; quercetin 3-O-glucoside, 3-O-galactoside, 3-O-sophoroside and 3-O-gentiobioside; kaempferol 3-O-glucoside and 3-O-arabinoside. The discontinuity in distribution pattern of quercetin 3-O-gentiobioside within these taxa, associated with the phytogeography and historical factors affecting plant distribution in this area, indicates a possible polytopic and polychronistic origin of

J. F. Bain; K. E. Denford

1979-01-01

390

Neotectonic and paleoseismicity studies on the Urumaco Fault, northern Falcón Basin, northwestern Venezuela  

Microsoft Academic Search

The northern Falcón Basin in northwestern Venezuela is affected by several small active faults, subordinated to the major right-lateral east–west-trending Oca–Ancón Fault System. A set of prominent NW–SE right-lateral faults — synthetic shears — such as the Urumaco, R??o Seco, Lagarto and La Soledad faults, stands out among those. The Urumaco Fault, located between the Lagarto and Mitare rivers (in

Franck A. Audemard; Jean-Claude Bousquet; José A. Rodr??guez

1999-01-01

391

Was the Coppermine Homocline of northwestern Canada uplifted as part of a Middle Proterozoic forebulge  

SciTech Connect

Application of the principles of elastic plate bending to subsurface geometric information and outcrop in northwestern Canada suggests that Proterozoic crust was loaded and deflected during orogenic activity between about 1.6 and 1.1 Ga. Exposed Hudsonian (ca. 1.8-2.0 Ga) basement separating younger but coeval stratigraphic sequences in the Coppermine Homocline on the west and Bathurst Inlet on the east can be explained as a forebulge associated with the loading.

Cook, F.A. (Univ. of Calgary, Alberta (Canada))

1991-01-01

392

Satellite observations and estimates of surface flow in the northwestern Gulf of Mexico  

E-print Network

circulation in the northwestern Gulf of Mexico. Infrared (IR) satellite imagery reveals regions of contrasting sea surface tem- perature and has been used to illustrate mesoscale features of the Gulf surface circulation. Vukovich et al. (1979) used very... IR satel- lite observations near a strong thermal front. These previous efforts have not used IR satellite imagery to study short term variability in mesoscale flow, to provide comparisons with simultaneous drifter observations, or to estimate high...

Barron, Charlie Nelms

2012-06-07

393

Reconstruction and climatic interpretation of a late Pleistocene peat deposit in northwestern Oregon  

Microsoft Academic Search

Summary 1 Climatic models predict that postglacial conditions in the Pacific Northwest of North America (between 11'000 and 10'000 years BP) were about 2-3 °C cooler than at present. These models were tested by examining plant macrofossils and insect remains in a late Pleistocene peat deposit in northwestern Oregon. 2 Stratigraphy in trenches (540 cm depth) revealed peat from 225

GEORGE O. POINAR; ROBSON BONNICHSEN; CLIFFORD HEDLUND

394

The fate and transport of nitrate in shallow groundwater in northwestern Mississippi, USA  

Microsoft Academic Search

Agricultural contamination of groundwater in northwestern Mississippi, USA, has not been studied extensively, and subsurface\\u000a fluxes of agricultural chemicals have been presumed minimal. To determine the factors controlling transport of nitrate-N into\\u000a the Mississippi River Valley alluvial aquifer, a study was conducted from 2006 to 2008 to estimate fluxes of water and solutes\\u000a for a site in the Bogue Phalia

Heather L. Welch; Christopher T. Green; Richard H. Coupe

395

Paleogeography of the Norwegian-Greenland and Northwestern European Sea Basins in the Paleogene  

Microsoft Academic Search

Published and original data on the lithology and fauna (mainly foraminifers) of the Paleogene Norwegian-Greenland and Northwestern\\u000a European Sea Basins are generalized in this article. Their paleogeographic evolution and the character of development of connections\\u000a with the North Atlantic, Mesotetis, and the Arctic Ocean are established from the moment of generation to their disappearance.\\u000a It is shown that the paleogeographic

G. S. Kharin; N. P. Lukashina

2010-01-01

396

Forest productivity of the Altay and Tianshan Mountains in the dryland, northwestern China  

Microsoft Academic Search

Biomass and net primary productivity (NPP) of coniferous forests in the Altay Mountains (AM) and Tianshan Mountains (TM), which are located in the dryland of northwestern China, were estimated using intensive data derived from a national forest inventory. Conifer forests in these two mountains have total biomass of 9.1–771.7tha?1 (mean = 312.6) and total NPP of 2.2–18.3tha?1year?1 (mean = 9.6)

Jian Ni

2004-01-01

397

Forest productivity of the Altay and Tianshan Mountains in the dryland, northwestern China  

Microsoft Academic Search

Biomass and net primary productivity (NPP) of coniferous forests in the Altay Mountains (AM) and Tianshan Mountains (TM), which are located in the dryland of northwestern China, were estimated using intensive data derived from a national forest inventory. Conifer forests in these two mountains have total biomass of 9.1-771.7 t ha1 (mean = 312.6) and total NPP of 2.2- 18.3

Jian Nia

398

An assessment of restoration success to forests planted for ecosystem restoration in loess plateau, Northwestern China  

Microsoft Academic Search

Using ecosystem attributes identified by the Society of Ecological Restoration International, we assessed three restoration\\u000a projects in the loess plateau, northwestern China, including planting Larix principis-rupprechtii (LS) and Pinus tabulaeformis (PS) on shrubland, and planting L. principis-rupprechtii on open forest land (LO). The reestablishment of native species in LS and PS was poorer than LO because of the excessive\\u000a stand

Zhanbiao Yang; Hongxi Jin; Gang Wang

2010-01-01

399

Anthropogenic air pollution observed near dust source regions in northwestern China during springtime 2008  

Microsoft Academic Search

Trace gases and aerosols were measured in Zhangye (39.082°N, 100.276°E, 1460 m a.s.l.), a rural site near the Gobi deserts in northwestern China during spring 2008. Primary trace gases (CO: 265 ppb; SO2: 3.4 ppb; NOy*: 4.2 ppb; hereafter results given as means of hourly data) in the area were lower than in eastern China, but still indicative of marked

Si-Chee Tsay; Joshua S. Fu; Russell R. Dickerson; Qiang Ji; Shaun W. Bell; Yang Gao; Wu Zhang; Jianping Huang; Zhanqing Li; Hongbin Chen

2010-01-01

400

Newly found submerged reefs on the Miyako-Sone platform, Ryukyu Arc, northwestern Pacific  

NASA Astrophysics Data System (ADS)

Bathymetric mapping and observations of the seafloor using a remotely operated vehicle were carried out on the top of the Miyako-Sone submarine platform, northeast of Miyako-jima, Ryukyu Islands, northwestern Pacific. The high-resolution bathymetric map provides a detailed geomorphology and spatial distribution of submerged reefs and terraces on the platform. Our observations show that a submerged reef occurs at a water depth of ca. 55 m as a barrier reef that are up to 500 m across (from east to west) and 1,000 m lonng (from north to south) with a prominent ridge structure (reef crest). The submerged reef deepens westward from the crest along which spurs and grooves are well developed. A shallow lagoon extends on the east of the crest. Submersible observations confirm that the submerged reef now serves a hard substrate on which soft corals and algae grow. Terraces form at a water depth of ca. 110 m around a submerged reef on the northwestern Miyako-Sone platform. Submersible observations show the terrace surface is extensivbely covered with modern rhodoliths and living larger benthic foraminifers. Well-preserved coral-reef topography likely indicates limited sediment transportion from Miyako-jima and Okinwa-jima islands to the Miyako-Sone submarine platform. We plan to provide chronological constraint by direct sampling from the submerged reef and terraces, which enable to delineate a global deglacial sea-level history especially during early deglacial times in the northwestern Pacific.

Arai, K.; Matsuda, H.; Sasaki, K.; Machiyama, H.; Inoue, T.; Iryu, Y.

2013-12-01

401

A late Jurassic pterosaur (Reptilia, Pterodactyloidea) from northwestern Patagonia, Argentina  

NASA Astrophysics Data System (ADS)

A small to medium-sized pterodactyloid pterosaur (wingspan approximately 1.10 m) from the Upper Jurassic (middle-late Tithonian) marine deposits of the Vaca Muerta Formation of Patagonia (Los Catutos area, central Neuquén Province, Argentina) is reported. The specimen lacks the skull but constitutes a nearly complete postcranial skeleton, which includes cervical and dorsal vertebrae; a few thoracic ribs; both pectoral girdles; the left pelvic girdle; a proximal right wing (humerus, ulna, and radius) and metacarpal IV; a left wing that lacks only wing phalanx four; and both hindlimbs, the right one without the foot. Ontogenetic features suggest that the new fossil corresponds to a relatively mature individual, probably a subadult. Observed characters support its assignment to the Archaeopteroactyloidea, a basal clade within the Pterodactyloidea. This specimen is the second pterosaur from Los Catutos and the most complete Jurassic pterosaur so far known from South America.

Codorniú, Laura; Gasparini, Zulma; Paulina-Carabajal, Ariana

2006-03-01

402

El Alisal: a new locality with trace fossils of the Puncoviscana Formation (late Precambrian-early Cambrian) in Salta Province. Argentina  

Microsoft Academic Search

The Puncoviscana, Suncho and Las Aguaditas\\/Negro Peinado formations represent a thick siliciclastic folded succession that crops out on a strip about 800 km long and 150 km wide in northwestern Argentina (Jujuy, Salta, Tucumán, Catamarca and La Rioja provinces). These sequences are lithologically characterized by very lowgrade metamorphic sediments grading from slates to schists; turbidites, pelagic clays, limestones and volcanic

Guillermo F. Aceñolaza; Marcelo Franco Tortello

2003-01-01

403

Detailed Cross Sections of the Eocene Green River Formation along the North and East Margins of the Piceance Basin, Western Colorado Using Measured Sections and Drill Hole Information.  

National Technical Information Service (NTIS)

The Eocene Green River Formation was deposited in Lake Uinta, a long-lived saline lake that covered much of the Piceance Basin in northwestern Colorado and the Uinta Basin in eastern Utah. This report presents 2 detailed cross sections of the Eocene Green...

R. C. Johnson

2014-01-01

404

Numerical simulation of the High Plains regional aquifer, northwestern Oklahoma  

USGS Publications Warehouse

The High Plains aquifer consists of the Tertiary Ogallala Formation and overlying Quaternary alluvium and terrace deposits together with parts of underlying rocks. Before extensive irrigation in the 1960's, recharge from precipitation was balanced by natural discharge. Baseflow was estimated as approximately 118 cubic feet per second in 1980. A finite-difference digital model simulated flow in the aquifer. Recharge was adjusted so that 1980 baseflow was 118 cubic feet per second. Recharge in the eastern half of the modeled area was 0.45 inch per year and one-half this value in the western half. Three hydraulic conductivity zones were used: 19.3 feet per day in the east; 16.2 feet per day in the center; and 8.28 feet per day in the west. A specific yield of 14.7 percent was used. The calibrated model gave a mean difference between predevelopment modeled and measured heads of -0.044 foot. Using 1980 pumping rates, the model was used to predict 1993 and 2020 water in storage and saturated thickness. The calculated water in storage , in million acre-feet, in 1941 (predevelopment) was 135.2; in 1980, 121.9; in 1993, 112.7; and in 2020, 96.2. (USGS)

Havens, J.S.; Christenson, S.C.

1984-01-01

405

Costs of Nutrient Losses in Priceless Soils Eroded From the Highlands of Northwestern Ethiopia  

NASA Astrophysics Data System (ADS)

Soils formation is a geomorphic process that takes place through the interaction of soil forming factors in several hundreds and thousands of years. However, land degradation and soil erosion is consistently taking place in the horn of Africa washing away this priceless product in short period of time. The scale of the problem dramatically increased due to the increase in deforestation, overgrazing, over-cultivation, inappropriate farming practices, and increasing human population. Several research results were published in the region showing the extent of land degradation and soil loss. However, little attempt has been done to estimate the nutrient loss in monitory terms which made it difficult for policy makers to properly understand the extent of the problem. A study was, therefore, conducted in 2011 to estimate soil and nutrient losses caused by water erosion and predict nutrient replacement costs on different land use types and slope classes at Harfetay watershed, Northwestern Ethiopia. The revised soil loss equation (RUSLE) was used to estimate the soil loss from the different land uses and slope classes in watershed. Moreover, nutrient loss from similar units was calculated by multiplying the in situ nutrient concentration of soil samples by the estimated soil loss using RUSLE. The replacement costs of nutrient losses were calculated by multiplying the nutrient loss with the price of available nutrients in urea and diammonium phosphate. The estimate of the RUSLE indicated that the average soil losses in the study watershed were 119 tons ha-1 year-1 for non-conserved crop land, 23 tons for conserved farmlands, 23 tons for forest and shrub lands, 19 tons for grazing lands, and 6 tons for plantation forest. The mean soil loss for lower slope classes (<15%), middle slope classes (15-30%) and upper slope classes (>30%) were 30.11, 48.09 and 57.22 tons ha-1 year-1, respectively. The highest losses of total nitrogen (154.7 kg ha-1 year-1), available phosphorus (1.84 kg ha-1 year-1), and organic matter (1677.9 kg ha-1 year-1) were obtained from non-conserved cropland. Conversely, the lowest values of the same parameters were registered from the land covered with plantation forest. Comparing slope classes for non conserved cropland, organic matter and nutrient losses were higher in upper slope classes followed by middle and lower ones. The replacement cost of available N and available P for non-conserved cropland, conserved cropland, forest/shrub lands, grazing lands and plantations were 121, 36, 27, 32 and 13 Birr ha-1 year-1, respectively (1USD = 19 Birr); and the weighted mean replacement cost in the watershed was estimated to be 98 Birr ha-1 year-1 which is about 20% of the cost of fertilizer applied per individual farmers in the watershed. From the study it was possible to conclude that conversion of forest lands and plantation forests to cropland causes serious soil and nutrient losses. Construction of conservation structures on cropland, however, will reduce soil and nutrient losses. To halt soil and nutrient loss and ensure sustainable land management and agricultural development in the Harfetay watershed and similar watersheds, policy and development interventions including increasing awareness of farmers on of soil and nutrient losses, enforcing land use policies and expanding bio-physical soil conservation practices are required.

Gebreselassie, Yihenew; Belay, Yihenew

2014-05-01

406

Late Cretaceous to Middle Eocene Geological Evolution of the Northwestern Caribbean - Constraints from Cuban Data  

NASA Astrophysics Data System (ADS)

Cuba acts as the northwestern boundary of the Caribbean Sea. However it is not part of the Caribbean plate, its geological development is deeply related to the plate history. In fact, its Cretaceous volcanic arc rocks tightly correlate with coeval sections in Hispaniola and Puerto Rico, and the same probably occurs with the ophiolites. The early Palaeogene events in Cuba were also involved in the Caribbean plate history. In general, two principal structural levels can be distinguished in the geological structure of Cuba. The rocks belonging to the upper level (Eocene to Quaternary) are little disturbed and can be referred to as the cover. Below it occurs the great complex of the Cuban orogenic belt, which consists mainly of rocks of Jurassic to Eocene age. In addition, small outcrops of Proterozoic metamorphic rocks also occur in north central Cuba. The Palaeocene-Eocene section contains volcanic arc sequences in SE Cuba and northward thrusted piggy back and foreland basins in central and western Cuba. The Mesozoic rocks lies unconformably below. The contacts between the major Mesozoic elements are always tectonic. With the exception of the rocks of the passive Mesozoic margin of North America in northern Cuba, the remaining units represent tectonostratigraphic terranes extending parallel to the axis of the present main island of Cuba. The northernmost unit is the Mesozoic passive continental margin of North America. It consists of a Jurassic- Cretaceous mainly marine sedimentary sequence now exposed as a thrust and fold belt along the northern edge of the Cuban mainland. The other units are, from north to south: the Northern Ophiolitic Belt, the Volcanic Arc Terrane and the Southern Metamorphic Terranes. The ophiolites and the Cretaceous volcanic arc terranes belong to the Proto-Caribbean plate and were accreted to the palaeomargin during Late Cretaceous and early Palaeogene episodes. Some constrains to Caribbean plate origin and evolution according to data from Cuba: Ophiolites: 1- The age of the rocks of the northern ophiolite belt is Upper Jurassic-Albian. Oceanic lithosphere formation, at least in the "Cuban" Proto-Caribbean, ended in the Albian. Cretaceous volcanic arcs: 2- At least two volcanic arc Cretaceous sections are present in Cuba, separated in several regions by a mainly sedimentary Albian-Cenomanian section. The lower arc is probably of Aptian-Albian age. The Cenomanian (or Turonian?) -Campanian upper arc is calcalkalic and contains abundant sedimentary marine interbeds. 3- Some thin tuff beds are present in the southernmost deep water deposits of the North American palaeomargin in western and central Cuba in the Aptian-Cenomanian. This fact could be explained by a volcanic arc located several hundred km to the south of the NA palaeomargin. 4- Cretaceous volcanism ended during the early Campanian all along Cuba. Sedimentary upper Campanian and Maastrichtian sections rest on top of the older Cretaceous sections. Volcanism is only reassumed in SE Cuba (Turquino volcanic arc) late in the Danian. Southern metamorphic terranes: 5- The southern metamorphic terranes are a main feature in the geology of Cuba. They are continental blocks sharing many stratigraphic features with the NA palaeomargin of western Cuba (Guaniguanico mountains). As the last one area seems related to the Yucatan (Maya) block, some authors consider the metamorphic terranes as fragments of the Maya block that travelled to the west.

Cobiella, J.; Hueneke, H.; Meschede, M.; Sommer, M.

2006-05-01

407

Paleozoic-early Mesozoic gold deposits of the Xinjiang Autonomous Region, northwestern China  

USGS Publications Warehouse

The late Paleozoic-early Mesozoic tectonic evolution of Xinjiang Autonomous Region, northwestern China provided a favorable geological setting for the formation of lode gold deposits along the sutures between a number of the major Eastern Asia cratonic blocks. These sutures are now represented by the Altay Shan, Tian Shan, and Kunlun Shan ranges, with the former two separated by the Junggar basin and the latter two by the immense Tarim basin. In northernmost Xinjiang, final growth of the Altaid orogen, southward from the Angara craton, is now recorded in the remote mid- to late Paleozoic Altay Shan. Accreted Early to Middle Devonian oceanic rock sequences contain typically small, precious-metal bearing Fe-Cu-Zn VMS deposits (e.g. Ashele). Orogenic gold deposits are widespread along the major Irtysh (e.g. Duyolanasayi, Saidi, Taerde, Kabenbulake, Akexike, Shaerbulake) and Tuergen-Hongshanzui (e.g. Hongshanzui) fault systems, as well as in structurally displaced terrane slivers of the western Junggar (e.g. Hatu) and eastern Junggar areas. Geological and geochronological constraints indicate a generally Late Carboniferous to Early Permian episode of gold deposition, which was coeval with the final stages of Altaid magmatism and large-scale, right-lateral translation along older terrane-bounding faults. The Tian Shan, an exceptionally gold-rich mountain range to the west in the Central Asian republics, is only beginning to be recognized for its gold potential in Xinjiang. In this easternmost part to the range, northerly- and southerly-directed subduction/accretion of early to mid-Paleozoic and mid- to late Paleozoic oceanic terranes, respectively, to the Precambrian Yili block (central Tian Shan) was associated with 400 to 250 Ma arc magmatism and Carboniferous through Early Permian gold-forming hydrothermal events. The more significant resulting deposits in the terranes of the southern Tian Shan include the Sawayaerdun orogenic deposit along the Kyrgyzstan border and the epithermal and replacement deposits of the Kanggurtag belt to the east in the Chol Tagh range. Gold deposits of approximately the same age in the Yili block include the Axi hot springs/epithermal deposit near the Kazakhstan border and a series of small orogenic gold deposits south of Urumqi (e.g. Wangfeng). Gold-rich porphyry copper deposits (e.g. Tuwu) define important new exploration targets in the northern Tian Shan of Xinjiang. The northern foothills of the Kunlun Shan of southern Xinjiang host scattered, small placer gold deposits. Sources for the gold have not been identified, but are hypothesized to be orogenic gold veins beneath the icefields to the south. They are predicted to have formed in the Tianshuihai terrane during its early Mesozoic accretion to the amalgamated Tarim-Qaidam-Kunlun cratonic block.

Rui, Z.; Goldfarb, R. J.; Qiu, Y.; Zhou, T.; Chen, R.; Pirajno, F.; Yun, G.

2002-01-01

408

Geochemical, U-Pb zircon, and Nd isotope investigations of the Neoproterozoic Ghawjah Metavolcanic rocks, Northwestern Saudi Arabia  

NASA Astrophysics Data System (ADS)

New geochemical, Nd-isotope and U-Pb zircon data from Neoproterozoic volcanic rocks from Wadi Sawawin in northwestern Saudi Arabia provide important constraints on the evolution of the crust in this part of the Arabian-Nubian Shield (ANS). The Ghawjah volcanic rocks range from tholeiitic to calc-alkaline and are metamorphosed to greenschist facies. U-Pb zircon analyses for Ghawjah andesite yield a weighted mean 206Pb/ 238U age of 763 ± 25 Ma, indicating that these are some of the oldest rocks of the Midyan terrane. Ghawjah volcanic rocks are mostly moderately fractionated, as indicated by Mg-numbers between 28 and 67, Cr between 5 to 537 ppm and Ni from 4 to 175 ppm, REE patterns are slightly fractionated [(La/Yb)N = 1.2 to 4.0], and multi-element diagrams show Ba, Sr, Rb and K enrichments and Nb and Ta depletions, typical of modern convergent-margin igneous rocks. Ghawjah volcanic rocks have positive ?Nd (+ 5.4 to + 8.2) and a mean model age of 0.71 Ga. Ghawjah volcanic rocks are similar to the "Younger Volcanic" rocks from the Central Eastern Desert (CED) of Egypt, in terms of stratigraphic relations, chemical compositions, Nd-isotopic compositions, and U-Pb zircon ages (~ 750 Ma), indicating that both were generated by partial melting of subduction-modified depleted mantle. The Ghawjah volcanic rocks are interpreted to have formed at ~ 750 Ma in an arc setting during an important episode of crust formation.

Ali, Kamal A.; Stern, Robert J.; Manton, William I.; Kimura, Jun-Ichi; Whitehouse, Martin J.; Mukherjee, Sumit K.; Johnson, Peter R.; Griffin, William R.

2010-12-01

409

Climate change increases deoxynivalenol contamination of wheat in north-western Europe.  

PubMed

Climate change will affect the development of cereal crops and the occurrence of mycotoxins in these crops, but so far little research has been done on quantifying the expected effects. The aim of this study was to assess climate change impacts on the occurrence of deoxynivalenol in wheat grown in north-western Europe by 2040, considering the combined effects of shifts in wheat phenology and climate. The study used climate model data for the future period of 2031-2050 relative to the baseline period of 1975-1994. A weather generator was used for generating synthetic series of daily weather data for both the baseline and the future periods. Available models for wheat phenology and prediction of deoxynivalenol concentrations in north-western Europe were used. Both models were run for winter wheat and spring wheat, separately. The results showed that both flowering and full maturation of wheat will be earlier in the season because of climate change effects, about 1 to 2 weeks. Deoxynivalenol contamination was found to increase in most of the study region, with an increase of the original concentrations by up to 3 times. The study results may inform governmental and industrial risk managers to underpin decision-making and planning processes in north-western Europe. On the local level, deoxynivalenol contamination should be closely monitored to pick out wheat batches with excess levels at the right time. Using predictive models on a more local scale could be helpful to assist other monitoring measures to safeguard food safety in the wheat supply chain. PMID:22742589

van der Fels-Klerx, H J; Olesen, J E; Madsen, M S; Goedhart, P W

2012-01-01

410

Molecular sex identification of dry human teeth specimens from Sokoto, Northwestern Nigeria  

PubMed Central

Background: The advent of molecular techniques has revolutionized the ability of scientists to estimate the sex of individuals. Forensic odontology plays an important role in establishing the sex of victims with bodies mutilated beyond recognition due to major disaster. The genetic difference between males and females is defined by the presence or absence of the Y-chromosome. The use of alphoid-repeat primers in sex estimation was first applied on dried blood. Generally, the X, Y alphoid repeats blind test attest to the accuracy of genetic testing, and also point the potential for occasional error in morphometric sexing. Aim: To estimate genetic sex of dry human teeth specimens from Sokoto, Northwestern Nigeria, using polymerase chain reaction (PCR). Materials and Methods: A single-blind study of DNA analysis for sex estimation of nine dry human teeth specimens from Sokoto, Northwestern Nigeria, through PCR, using alphoid repeats primers, was undertaken. Results: The genetic sex of each group of the teeth samples were accurately (100%) identified. For each group of teeth, PCR Sensitivity = 100%, Specificity = 0%, Predictive value of positive test = 100%, Predictive value of negative test = 0%, False positive rate = 0%, False negative rate = 0%, Efficiency of test = 100%. Fisher's exact probability test P = 1. Z-test: z- and P values were invalid. Conclusion: This study has demonstrated the successful use of alphoid-repeat primers in genetic sex identification of human dry teeth samples from Sokoto, Northwestern Nigeria. This is the first known study estimating the sex of human dry teeth specimens by means of PCR in Nigeria. There is need for further studies in Nigeria to complement the findings of this study. PMID:25125922

Zagga, AD; Ahmed, H. OON; Ismail, SM; Tadros, AA

2014-01-01

411

Hydrologic data from Naval Oil Shale Reserves, Parachute Creek basin, northwestern Colorado, 1980-81  

USGS Publications Warehouse

Two years (water yr 1980 and 1981) of data collected by the U.S. Geological Survey for the U.S. Department of Energy, Naval Petroleum and Oil Shale Reserves, in the Parachute Creek drainage basin of northwestern Colorado are tabulated. Data were obtained from five surface water gages, two automatic sediment samplers, and two water quality monitors. Climate data include maximum, minimum, and average temperature and relative humidity, average wind speed and wind direction, and total daily solar radiation. Daily total precipitation is reported for three stations, and snow-course data reported for one site. (Author 's abstract)

Galyean, K.C.; Adams, D.B.; Collins, D.L.

1985-01-01

412

Fukushima-derived radiocesium in the northwestern Pacific Ocean in February 2012.  

PubMed

We measured radiocesium ((134)Cs and (137)Cs) in seawaters collected at stations in the northwestern Pacific Ocean in February 2012. Activity concentration of Fukushima-derived radiocesium was highest in the transition area between the subarctic and subtropical regions, which was due to the direct discharge. The direct discharged radiocesium was transported southwardly across the Kuroshio Extension along isopycnal mixing. More than 80% of the Fukushima-derived radiocesium at stations both in the transition area and subtropical region was derived from the direct discharge. PMID:23582498

Kumamoto, Yuichiro; Murata, Akihiko; Kawano, Takeshi; Aoyama, Michio

2013-11-01

413

Chlorophyll-specific absorption coefficients and pigments of phytoplankton off Sanriku, northwestern North Pacific  

Microsoft Academic Search

The variety in shape and magnitude of thein vivo chlorophyll-specific absorption spectra of phytoplankton was investigated in relation to differences in pigment composition\\u000a off Sanriku, northwestern North Pacific. Site-to-site variations of the absorption coefficients,a\\u000a \\u000a ph\\u000a \\u000a * (?), and pigment composition were clearly observed. At warm-streamer stations, higher values ofa\\u000a \\u000a ph\\u000a \\u000a * (440) anda\\u000a ph\\u000a * (650) were found with relatively

Koji Suzuki; Motoaki Kishino; Kousei Sasaoka; Sei-Ichi Saitoh; Toshiro Saino

1998-01-01

414

Characteristics of extreme rainfall events in northwestern Peru during the 1982-1983 El Nino period  

NASA Technical Reports Server (NTRS)

Histograms and contour maps describing the daily rainfall characteristics of a northwestern Peru area most severely affected by the 1982-1983 El Nino event were prepared from daily rainfall data obtained from 66 stations in this area during the El Nino event, and during the same 8-month intervals for the two years preceding and following the event. These data were analyzed, in conjunction with the anlysis of visible and IR satellite images, for cloud characteristics and structure. The results present a comparison of the rainfall characteristics as a function of elevation, geographic location, and the time of year for the El Nino and non-El Nino periods.

Goldberg, R. A.; Tisnado, G. M.; Scofield, R. A.

1987-01-01

415

Infection of Myxobolus galaxii (Myxozoa) in Galaxias maculatus (Osmeriformes: Galaxiidae) from northwestern Patagonian Andean lakes (Argentina).  

PubMed

The infection of Myxobolus galaxii Szidat, 1953, from the musculature and abdominal organs of northwestern Patagonian Galaxias maculatus is described. Plasmodia are histozoic and intercellular. Spores are pyriform in valvar view and biconvex in sutural view, with 4-9 edge notches in the sutural line, varying in shape within the same plasmodium. Myxobolus galaxii was detected in fish from 7 of 17 Andean Patagonian lakes, with prevalences ranging between 2 and 17%. A repeating pattern of summer increment in prevalence was observed, which could be explained by the ontogenetic migratory movements of the fish in Lake Gutiérrez. Also, accumulation of plasmodia through the life span of fish was detected. PMID:17539428

Flores, Verónica; Viozzi, Gustavo

2007-04-01

416

Transcript: NUIT Information Security News Podcast, September 6, 2011 Hello, I'm Roger Safian, a senior data security analyst here at Northwestern University, and  

E-print Network

, a senior data security analyst here at Northwestern University, and you're listening to a special Welcome to Campus information security new podcast brought to you by the Northwestern University Information Technology website. Just go to the Download section and you'll find a free copy and you can download

Shahriar, Selim

417

Aquifers in the Sokoto basin, northwestern Nigeria, with a description of the general hydrogeology of the region  

USGS Publications Warehouse

The Sokoto Basin of northwestern Nigeria lies in the sub-Saharan Sudan belt of west Africa in a zone of savannah-type vegetation. Rainfall, averaging about 30 inches annually in much of the basin, occurs chiefly in a wet season which lasts from May to October. A prolonged dry season extending from October to April is dominated by dusty harmattan winds from the northeast. April and May are the hottest months, when temperatures occasionally reach 105?F. Flow in streams of the Sokoto Basin is mostly overland runoff. Only in a few reaches, fed by ground-water discharge from the sedimentary rocks, are streams perennial. In the River Zamfara basin, ground-water discharge contributes almost 1 inch of the average 3.33 inches of total annual runoff. In the vicinity of Sokoto, the River Rima flows throughout the year sustained by spring discharge from perched ground water in limestone of the Kalambaina Formation. On the crystalline terrane where most of the streams rise, total annual runoff may exceed 5 inches, very little of which is ground-water discharge. The sedimentary rocks of the basin range in age from Cretaceous to Tertiary and are composed mostly of interbedded sand, clay, and some limestone; the beds dip gently toward the northwest. Alluvium of Quaternary age underlies the lowlands of the River Sokoto (now Sokoto) and its principal tributaries. These rocks contain three important artesian aquifers, in addition to regional unconfined ground-water bodies in all the principal outcron areas, and a perched water body in the outcrop of the Kalambaina Formation. Artesian aquifers occur at depth in the Gundumi Formation, the Rima Group, and the Gwandu Formation and are separated from one another by clay beds in the lower part of the Rima Group and the Dange Formation. In outcrop, clay in the Dange Formation also supports the perched water of the Kalambaina Formation. The Gundumi Formation, resting on the basement complex, is composed of varicolored clay, sand, and gravel and attains a thickness of 800 to 1,000 feet in its downdip extensions. Most of the formation is thin bedded and clayey and therefore does not yield large quantities of water to boreholes; the average yield is 2,700 gph (gallons per hour). (All gallons are imperial gallons.) Nevertheless, the upper part of the formation is sandy and more permeable and forms a regional artesian aquifer from which yields of as much as 6,600 gph are obtained from single boreholes. Clay in the lower part of the Rima Group confines the Gundumi aquifer downdip, so that at Rabah and Sokoto, for example, in the River Sokoto fadama (valley floor), artesian flow is found in boreholes screened in the Gundumi. Aquifer tests indicate low transmissivities, ranging from 300 to 5,000 gpd per ft (gallons per day per foot) in the lower part of the Gundumi Formation; but in the upper sandy zone the transmissivities are much higher, reaching 66,000 gpd per ft. In the western part of the Sokoto Basin, more productive aquifers with higher heads usually lie above the Gundumi aquifer so that it is not attractive for development, except in the River Sokoto fadama where artesian flow is possible. The Illo Group, which is in part contemporaneous with the Gundumi Formation, includes interbedded varicolored clay and grit in the southern part of the Sokoto Basin. The upper part of the Illo is known to be water-bearing; however, except for the test borehole at Mungadi, little is known of its subsurface extent and water-yielding potential. Overlying the Gundumi Formation in the central and northern part of the Sokoto Basin are interbedded fine gray sand and dark gray clay of the Wurno and Taloka Formations, separated in the extreme north by clay shale of the Dukamaje Formation. Collectively known as the Rima Group, these sediments attain a thickness of more than 1,000 feet near the Niger border. At depth and downdip the clayey beds practically disappear; the sandy beds become thicker and coar

Anderson, H.R.; Ogilbee, William

1973-01-01

418

Aerosols properties during dust-storm episodes over Jaipur, Northwestern India  

NASA Astrophysics Data System (ADS)

Continuous routine aerosol measurements have been carried out at Jaipur (Rajasthan, Northwestern India) since April 2009 with a CIMEL sun photometer integrated in the global Aerosols Robotic Network (AERONET) program. The present study investigates the aerosol properties during dust storm episodes over Jaipur, Northwestern India. A series of high dust storms were identified as indicated by high values of aerosols optical thickness (AOT) with a significant drop in angstrom exponent values (nearly zero and negative). Consequently, a progressive increase in Single Scattering Albedo (SSA440 nm = 0.89, SSA675 nm = 0.95, SSA870 nm = 0.97, SSA1020 nm = 0.976) suggests more scattering nature of regional aerosols associated with abundant dust loading. Trajectories back in time showed that the air collected in Jaipur during dust period originated from desert regions in the western part of India. Additionally, a comparative analysis of the mean AOT derived from satellite data and Potential Source Contribution Function (PSCF) analysis helped to understand the source region of these particles.

Payra, Swagata; Verma, Sunita; Prakash, Divya; Kumar, Pramod; Soni, Manish; Holben, Brent

2013-05-01

419

Profundulus kreiseri, a new species of Profundulidae (Teleostei, Cyprinodontiformes) from northwestern Honduras  

PubMed Central

Abstract A new species of Profundulus, Profundulus kreiseri (Cyprinodontiformes: Profundulidae), is described from the Chamelecón and Ulúa Rivers in the northwestern Honduran highlands. Based on a phylogenetic analysis using cytochrome b and the presence of synapomorphic characters (dark humeral spot, a scaled preorbital region and between 32-34 vertebrae), this new species is placed in the subgenus Profundulus, which also includes Profundulus (Profundulus) oaxacae, Profundulus (Profundulus) punctatus and Profundulus (Profundulus) guatemalensis. Profundulus kreiseri can be distinguished from other members of the subgenus Profundulus by having less than half of its caudal fin densely scaled. Profundulus kreiseri can further be differentiated from Profundulus (Profundulus) oaxacae and Profundulus (Profundulus) punctatus by the absence of rows of dark spots on its flanks. The new species can further be differentiated from Profundulus (Profundulus) guatemalensis by the presence of fewer caudal- and pectoral-fin rays. The new species is distinguished from congeners of the profundulid subgenus Tlaloc (viz., Profundulus (Tlaloc) hildebrandi, Profundulus (Tlaloc) labialis, Profundulus (Tlaloc) candalarius and Profundulus (Tlaloc) portillorum) by having a scaled preorbital region and a dark humeral spot. Profundulus kreiseri and Profundulus portillorum are the only two species of Profundulus that are endemic to the region south of the Motagua River drainage in southern Guatemala and northwestern Honduras. PMID:23166464

Matamoros, Wilfredo A.; Schaefer, Jacob F.; Hernandez, Carmen L.; Prosanta Chakrabarty

2012-01-01

420

Forest site-quality estimation using Forest Ecosystem Classification in Northwestern Ontario.  

PubMed

Site index for jack pine, black spruce and trembling aspen was found to be poorly related to soil types described in the Northwestern Ontario Forest Ecosystem Classification (NWO FEC). Statistical analyses showed that average site indices for most soil types and groupings of soil types were not significantly different from each other.Site index varies greatly within presently defined NWO FEC soil types because certain soil and topographic features that are closely related to site index vary greatly within soil types or are not well described by the NWO FEC soil types. These critical soil features have been identified by soil-site studies that show features most closely related to site index usually are surface soil features found within the effective rooting zone of forest trees. These critical features include depth to bedrock, depth to root restricting soil layers, and coarse fragment content and texture of surface soil horizons.Site-quality research in Northwestern Ontario is closely integrated with the NWO FEC program, thus future NWO FEC soil classifications probably will use results from our soil-site research as a basis for soil type revisions. The result will be future soil types that are more closely related to forest site quality and thus to the capability of forest land to produce tree growth. PMID:24198025

Carmean, W H

1996-01-01

421

Contemporary horizontal crustal movement estimation for northwestern Vietnam inferred from repeated GPS measurements  

NASA Astrophysics Data System (ADS)

We present a horizontal velocity field determined from a GPS network with 22 sites surveyed from 2001 to 2012 in northwestern Vietnam. The velocity is accurately estimated at each site by fitting a linear trend to each coordinate time series, after accounting for coseismic displacements caused by the 2004 Sumatra and the 2011 Tohoku earthquakes using static fault models. Considering the coseismic effects of the earthquakes, the motion of northwestern Vietnam is 34.3 ± 0.7 mm/yr at an azimuth of N108° ± 0.7°E in ITRF2008. This motion is close to, but slightly different from, that of the South China block. The area is in a transition zone between this block, the Sundaland block, and the Baoshan sub-block. At the local scale, a detailed estimation of the crustal deformation across major fault zones is geodetically revealed for the first time. We identify a locking depth of 15.3 ± 9.8 km with an accumulating left-lateral slip rate of 1.8 ± 0.3 mm/yr for the Dien Bien Phu fault, and a shallow locking depth with a right-lateral slip rate of 1.0 ± 0.6 mm/yr for the Son La and Da River faults.

Duong, N. A.; Sagiya, T.; Kimata, F.; To, T. D.; Hai, V. Q.; Cong, D. C.; Binh, N. X.; Xuyen, N. D.

2013-12-01

422

Statistical distributions of trace metal concentrations in the northwestern Mediterranean atmospheric aerosol.  

PubMed

The concentrations of 11 crustal and anthropogenic trace metals (Li, Al, V, Mn, Fe, Co, Ni, Cu, Zn, Cd, Pb) were measured from 2006 to 2008 in the atmospheric aerosol at a northwestern Mediterranean coast (station of Cap Ferrat, situated on the southeastern coast of France). Statistical models (lognormal, Weibull, and gamma) that best represented the trace metal distribution for this environment are described. The lognormal model was selected for the distributions of (in decreasing strength of the fit) Al, Co, Li, Zn, Mn, Cu, Pb, and Cd, i.e., metals that are introduced into the atmospheric aerosol by pulses inducing temporal variability in their concentrations. The gamma model was associated with Fe, i.e., metals that exhibit less inter-annual variability than the former trace metals. The third mode (Weibull) represented the distribution of the concentrations of V and Ni. The statistical approach presented in this study contributed to better define and constrain the distribution of the 11 trace metals of the atmospheric aerosol from the northwestern Mediterranean coast. In a close future, knowledge of these statistical distributions will allow using convolution models to separate their natural and anthropogenic contributions, therefore increasing our ability to study anthropogenic emissions of trace metals and their impact on the environment. PMID:23685929

Robin, Thomas; Guidi, Lionel; Dufour, Aurélie; Migon, Christophe

2013-11-01

423

Indexes of hydrologic data from selected coal-mining areas in northwestern Colorado  

USGS Publications Warehouse

Currently (1988), data from hydrologic studies related to coal mining that have been done in northwestern Colorado since the early 1970 's are stored in the files of private companies and government offices and in various computer systems. To compile these data for additional research, a trip to each office would have to be made to determine the availability and acceptability of the data. The U.S. Geological Survey, in cooperation with the U.S. Bureau of Land Management and the Colorado Mined Land Reclamation Division, has created a database (COALDATA) that includes stream discharge, groundwater levels, and chemical analysis of water samples that were collected by private companies and government agencies other than the U.S. Geological Survey in and near selected coal mines in northwestern Colorado. Indexes in this report list 93 surface water sites and 95 groundwater sites where hydrologic data are available in the COALDATA data base. The indexes also list 62 surface water sites and 480 groundwater sites in the U.S. Geological Survey data base, which is separate from the COALDATA data base and contains only data collected by the U.S. Geological Survey. The combined output of the COALDATA data base and the U.S. Geological Survey data base provides surface water and groundwater data that include most of the study area. (USGS)

Gaggiani, N.G.

1989-01-01

424

Northwestern Argentina: a center of genetic diversity of lemon verbena (Aloysia citriodora PALÁU, Verbenaceae).  

PubMed

The aerial parts of lemon verbena (Aloysia citriodora PALÁU) are worldwide used due to their medicinal and aromatic properties. The essential-oil and acteoside contents have been proposed as the main quality markers for their pharmacological and organoleptic features. The northwestern region of Argentina has been repeatedly proposed as the place of origin for this species. For this reason, the essential-oil yields and chemical compositions of leaves of 25 populations of lemon verbena from both wild collections and experimental crops from this region were studied. Plants from six different collections were subsequently grown on the same experimental parcel located at Cerrillos, Salta province, during more than seven years. In addition, the acteoside contents determined in all the samples collected in 2010 showed significant variations (from 0.5 to 4.0%). Large differences were observed in the essential-oil composition and yields, which ranged from 0.4 to 2.1% (v/w). Nevertheless, most of the samples complied with the European Pharmacopoeia specifications. A remarkable chemical diversity with at least four clearly defined chemotypes was detected in this region. Therefore, it would be urgent to encourage actions to protect these genotypes of lemon verbena in the northwestern Argentina. PMID:23418172

Di Leo Lira, Paola; van Baren, Catalina M; López, Simon; Molina, Ana; Heit, Cecilia; Viturro, Carmen; de Lampasona, Marina P; Catalán, Cesar A; Bandoni, Arnaldo

2013-02-01

425

Soil, environmental, and watershed measurements in support of carbon cycling studies in northwestern Mississippi  

USGS Publications Warehouse

Measurements including soil respiration, soil moisture, soil temperature, and carbon export in suspended sediments from small watersheds were recorded at several field sites in northwestern Mississippi in support of hillslope process studies associated with the U.S. Geological Survey's Mississippi Basin Carbon Project (MBCP). These measurements were made to provide information about carbon cycling in agricultural and forest ecosystems to understand the potential role of erosion and deposition in the sequestration of soil organic carbon in upland soils. The question of whether soil erosion and burial constitutes an important net sink of atmospheric carbon dioxide is one hypothesis that the MBCP is evaluating to better understand carbon cycling and climate change. This report contains discussion of methods used and presents data for the period December 1996 through March 1998. Included in the report are ancillary data provided by the U.S. Department of Agriculture (USDA) ARS National Sedimentation Laboratory and U.S. Forest Service (USFS) Center for Bottomland Hardwoods Research on rainfall, runoff, sediment yield, forest biomass and grain yield. Together with the data collected by the USGS these data permit the construction of carbon budgets and the calibration of models of soil organic matter dynamics and sediment transport and deposition. The U.S. Geological Survey (USGS) has established cooperative agreements with the USDA and USFS to facilitate collaborative research at research sites in northwestern Mississippi.

Huntington, T.G.; Harden, J.W.; Dabney, S.M.; Marion, D.A.; Alonso, C.; Sharpe, J.M.; Fries, T.L.

1998-01-01

426

20th-century glacier recession and regional hydroclimatic changes in northwestern Patagonia  

NASA Astrophysics Data System (ADS)

This paper documents the occurrence of significant glacier and hydroclimatic changes in northwestern Patagonia during the past century. Drastic, widespread glacier recession is documented by repeat photography of some of the earliest glacier images from southern South America. Linear trends in regionally-averaged annual and seasonal temperature and precipitation records indicate significant warming and decreasing precipitation over the 1912-2002 interval. A climatic index is developed, based on winter precipitation and summer temperature records, that mimics glacier mass balance relationships and shows a strong negative trend which agrees with the drastic glacier recession shown by the photographic comparisons. Short positive periods of this climatic index broadly correspond with known evidence of glacier advances in the region. Regionally-averaged mean annual streamflow records east of the mountains were used in an independent verification check of the climatic series used in this study. This regional runoff record shows a strong negative trend, remarkable similarities with the climatic index, and highly significant positive (negative) correlations with the regional precipitation (temperature) series. This highlights the existence of a strong, regionally coherent hydroclimatic signal across this region and supports the utility of these records as environmental indicators for northwestern Patagonia between ca. 38° and 45°S. Given the significant socio-economic importance of rivers and glaciers in this area, further research is needed to evaluate the full range of natural hydroclimate variability and improve understanding of potential impacts of the future warmer and drier climates projected for this region.

Masiokas, Mariano H.; Villalba, Ricardo; Luckman, Brian H.; Lascano, Marcelo E.; Delgado, Silvia; Stepanek, Petr

2008-01-01

427

Seroprevalence of Toxoplasma gondii infection in dairy goats in Shaanxi Province, Northwestern China  

PubMed Central

Background Toxoplasma gondii is an important zoonotic pathogen causing significant human and animal health problems. Infection in dairy goats not only results in significant reproductive losses, but also represents an important source of human infection due to consumption of infected meat and milk. In the present study we report for the first time seroprevalence of T. gondii infection in Guanzhong and Saanen dairy goats in Shaanxi province, Northwestern China. Results Sera from 751 dairy goats from 9 farms in 6 counties were examined for T. gondii antibodies with an indirect haemagglutination (IHA) test. Antibodies to T. gondii were detected in 106 (14.1%) serum samples, with antibody titres ranging from 1:64 to 1:1024. Seropositive goats were found in all 9 farms and seroprevalences in Guanzhong (16.3%, 75/461) and Saanen (10.7%, 31/290) dairy goats were not statistically significantly different. All the factors (sex, age and location) reported in the present study affected prevalence of infection, and seroprevalence increased with age, suggesting postnatal acquisition of T. gondii infection. Conclusions The results of the present survey indicate that infection by T. gondii is widely prevalent in dairy goats in Shaanxi province, Northwestern China, and this has implications for prevention and control of toxoplasmosis in this province. PMID:21457538

2011-01-01

428

Fire Regimes and Forest Structure in the Mountains of Northwestern Mexico and Southern California  

NASA Astrophysics Data System (ADS)

In contrast to a few isolated forests in northern Mexico, most forests in the western Untied States have been significantly modified by fire suppression, harvesting, and livestock grazing. The culmination of these past management activities has produced over 20 million ha of US forests with high fire hazards and many of these areas are in need of restoration. Understanding reference conditions is challenging because we have few intact forests functioning under the continuing influence of climate variation, insects, diseases, and frequent fires. This presentation summarizes information from reference sites in northwestern Mexico and contrasts it to current forest structure and fire regimes in southern California forests. Heterogeneity is common in the intact forests of northwestern Mexico. Restoration targets across similar forests in the United States and elsewhere should incorporate variation and not manage for average characteristics at the stand level, replicated for all stands across very large spatial scales. Conservation of the forests in the northwester Mexico is critical because it is the last landscape-scale, old-growth mixed conifer forest in western North America with a relatively intact frequent fire regime.

Stephens, S. L.

2004-12-01

429

Fire cue effects on seed germination of six species of northwestern Patagonian grasslands  

NASA Astrophysics Data System (ADS)

Postfire recruitment of seedlings has been attributed to a stimulation of germination by fire-related cues. The germination response to heat shock (80 °C - 5 min), smoke (60 min), the combination of both factors and no heat no smoke (control) was studied in six native species (two dominant grasses, two dominant shrubs and two annual fugitive herbs) of northwestern Patagonian grasslands. Seeds of the grasses Festuca pallescens and Stipa speciosa and the shrub Senecio bracteolatus (Asteraceae) germinated when they were exposed to heat shock, whereas seeds of the other shrub, Mulinum spinosum (Apiaceae), were killed by this fire cue. In grasses, probably the glume of caryopsis protected embryos from heat. Possibly, the seed size could explain the different responses of the two shrubs. Heat combined with smoke reduced seed germination for S. speciosa and S. bracteolatus. The heat could have scarified seeds and the longer exposure to smoke could have been toxic for embryos. The same treatment increased germination of the annual fugitive herb Boopis gracilis (Calyceraceae). We concluded that fire differentially affects the seedling recruitment of the studied species in the northwestern Patagonian grasslands.

Gonzalez, S. L.; Ghermandi, L.

2012-09-01

430

Benefits of collecting local data on breast cancer and mammography practices in northwestern Pennsylvania.  

PubMed Central

The use of local data on cancer incidence and mortality and on risk-related behaviors to help communities set priorities and guide program planning is an important facet of the National Cancer Institute's Program, "Data-Based Intervention Research for Public Health Agencies." As a participant in this program, the Pennsylvania Department of Health has developed a "breast cancer profile" for a seven-county, predominantly rural region of northwestern Pennsylvania. Community hospitals in the area are collaborating with the health department to develop interventions to enhance screening mammography. The availability of the profiles allowed hospitals to compare local breast cancer risk and screening activities with those of the State and nation, to target interventions, and to establish a baseline to measure changes over time. The data generated great interest among health professionals in northwestern Pennsylvania because, contrary to their expectations, the region was quite similar to the State and nation. While the proportion of women ages 40 and older who had ever had a mammogram was relatively high (66 percent), the proportion with more than one mammogram was considerably lower (43 percent), suggesting that hospitals focus on promoting regular mammography. Although it is feasible to develop data-based interventions for local areas, the effort is not trivial. State and national agencies must cooperate to ensure comparability of data collection and reports so that comparisons of local, State, and national data can be produced routinely. PMID:8497579

Norman, S A; Weinberg, G B; Krampe, B R; Finnegan, E T

1993-01-01

431

Genetic structuring of remnant forest patches in an endangered medicinal tree in North-western Ethiopia  

PubMed Central

Background Habitat loss and fragmentation may have detrimental impacts on genetic diversity, population structure and overall viability of tropical trees. The response of tropical trees to fragmentation processes may, however, be species, cohort or region-specific. Here we test the hypothesis that forest fragmentation is associated with lower genetic variability and higher genetic differentiation in adult and seedling populations of Prunus africana in North-western Ethiopia. This is a floristically impoverished region where all but a few remnant forest patches have been destroyed, mostly by anthropogenic means. Results Genetic diversity (based on allelic richness) was significantly greater in large and less-isolated forest patches as well as in adults than seedlings. Nearly all pairwise FST comparisons showed evidence for significant population genetic differentiation. Mean FST values were significantly greater in seedlings than adults, even after correction for within population diversity, but varied little with patch size or isolation. Conclusions Analysis of long-lived adult trees suggests the formerly contiguous forest in North-western Ethiopia probably exhibited strong spatial patterns of genetic structure. This means that protecting a range of patches including small and isolated ones is needed to conserve the extant genetic resources of the valuable forests in this region. However, given the high livelihood dependence of the local community and the high impact of foreign investors on forest resources of this region, in situ conservation efforts alone may not be helpful. Therefore, these efforts should be supported with ex situ gene conservation actions. PMID:24602239

2014-01-01

432

Distribution of trace elements in the Mississippi River plume and the Northwestern Gulf of Mexico  

SciTech Connect

The fate of 55 trace and rare earth elements in the Mississippi River plume and coastal waters of the Northwestern Gulf of Mexico is being investigated as part of a large-scale physical oceanographic study. Trace element speciation and transport in (2O L) seawater samples are being investigated in a three-phase model in which samples are separated into a particulate (>400 nm), colloidal (1--400 nm) and dissolved phases (<1 nm) prior to elemental analysis by ICP/MS. Data were obtained on four discrete cruises in 1992--93. Detection limits were 0.1 ng/ml for the dissolved and colloidal phases and {approximately} 1 ng/g for suspended particulates and bedded sediment samples. All analysis data were corrected for blanks and isotopic interferences. All elements were detected in all samples at trace levels or above. Riverine inputs from the Mississippi and Atchafalaya Rivers were identified in coastal waters. Inputs from the Calcasieu, Sabine and Galveston Rivers were also detected. Suspended particulate concentrations were highly correlated with surficial bedded sediment concentrations. Element ratioing techniques demonstrated that several elements were preferentially bound to colloidal phase fraction. Dilution of dissolved phase riverine sources using salinity data yielded good correlations. Estimates of the flux of each element are presented in a simple box model of the northwestern Gulf waters.

Means, J.C.; McMillin, D.J.; Reily, L.A. [Louisiana State Univ., Baton Rouge, LA (United States)

1994-12-31

433

To get started, point your browser to http://www.northwestern.edu/hr/jobs . 1. If you are a staff member, faculty member, or a student that is paid click on the Current Northwestern  

E-print Network

To get started, point your browser to http://www.northwestern.edu/hr/jobs . 1. If you are a staff to search for regular staff or temporary jobs. You will be brought to the Self Service sign in page where links. Self Service > Recruiting/Job Openings > Apply for Jobs. This will automatically sign you

Shahriar, Selim

434

Planet formation  

Microsoft Academic Search

Models of planetary formation are developed using the present single example of a planetary system, supplemented by limited astrophysical observations of star-forming regions and circumstellar disks. The solar nebula theory and the planetesimal hypothesis are discussed. The latter is found to provide a viable theory of the growth of the terrestrial planets, the cores of the giant planets, and the

Jack J. Lissauer

1993-01-01

435

Northwestern Agricultural  

E-print Network

to work independently and as part of a team Good communication skills Valid Montana drivers' license, near Creston 4570 MT Hwy 35, Kalispell, MT 59901 Time: Approx. mid-May to end of August, flexible faculty and staff with crop production research in both field and laboratory settings. Field work includes

Maxwell, Bruce D.

436

Reference Services to Police Officer Students at the School of Police Staff and Command, Traffic Institute, Northwestern University  

Microsoft Academic Search

This paper focuses on the reference services provided by librarians at the Transportation Library for the police officer students enrolled in the School of Police Staff and Command, Traffic Institute, Northwestern University (Evanston, Illinois). Although this program is unique, the wealth of experience gained over several years can be useful for others who are planning and implementing services for adult

Hema Ramachandran

2001-01-01

437

Range-wide phylogeographic analysis of the spotted frog complex (Rana luteiventris and Rana pretiosa) in northwestern North America  

E-print Network

Range-wide phylogeographic analysis of the spotted frog complex (Rana luteiventris and Rana complex (Rana luteiventris and Rana pretiosa) across its range in northwestern North America to understand March 2008 Revised 9 May 2008 Accepted 27 May 2008 Available online 4 June 2008 Keywords: Rana Spotted

Funk, W. Chris

438

The Northwestern University Sandhouse Gang and the Chicago Chapter of the Transportation Research Forum (TRF) are proud to present......  

E-print Network

The Northwestern University Sandhouse Gang and the Chicago Chapter of the Transportation Research Meeting (Coffee, tea, pop and water will be provided) Location: DePaul University, College of Law Lewis of the Transportation Center, and he also has an MBA from Kellogg and a BA from Harvard. #12;

Bustamante, Fabián E.

439

Introgressive hybridization and population genetic diversity between rusty-necklaced partridge and chukar partridge in northwestern China  

Microsoft Academic Search

Introgressive hybridization is a common feature of the contact zone between divergent partridges of the genus Alec- toris . The rusty-necklaced partridge ( Alectoris magna ) is paralleled with the chukar partridge ( A. chukar ) along the Liupan Moun- tain in northwestern China, and hybridization between the two species has been detected in the contact zone within this region.

Zuhao Huang; Zhisong Yang; Jiao Zhang; Naifa Liu

2009-01-01

440

Mitochondrial DNA variation in bull trout (Salvelinus confluentus) from northwestern North America: implications for zoogeography and conservation  

Microsoft Academic Search

Bull trout, Salvelinus confluentus (Salmonidae), are distributed in northwestern North America from Nevada to Yukon Territory, largely in interior drainages. The species is of conservation concern owing to declines in abundance, particularly in southern portions of its range. To investigate phylogenetic structure within bull trout that might form the basis for the delineation of major conservation units, we conducted a

Eric B. Taylor; Susan Pollard; Derek Louie

1999-01-01

441

Subscriber access provided by Northwestern Univ. Library Journal of the American Chemical Society is published by the American Chemical  

E-print Network

Subscriber access provided by Northwestern Univ. Library Journal of the American Chemical Society is published by the American Chemical Society. 1155 Sixteenth Street N.W., Washington, DC 20036 Communication for metal-organic framework chemistry.6 CH2BrCl was chosen as the parent solvent for each of the studies

442

Subscriber access provided by Northwestern Univ. Library Journal of the American Chemical Society is published by the American Chemical  

E-print Network

Subscriber access provided by Northwestern Univ. Library Journal of the American Chemical Society is published by the American Chemical Society. 1155 Sixteenth Street N.W., Washington, DC 20036 Communication and computational studies, it has become increasingly clear that the presence of coordinatively unsaturated metal

443

Subscriber access provided by Northwestern Univ. Library Journal of the American Chemical Society is published by the American Chemical  

E-print Network

Subscriber access provided by Northwestern Univ. Library Journal of the American Chemical Society is published by the American Chemical Society. 1155 Sixteenth Street N.W., Washington, DC 20036 Communication computational studies or single-crystal X-ray structural studies.5 Furthermore, they can differ substantially

444

I N D E X . STREAMS AND L A D S OF WESTERN MONTANA AND NORTHWESTERN WYOMING.  

E-print Network

of fishes obtained iu Montana nnd Wyoming ........................................... 41-5: Aster CreekI N D E X . STREAMS AND L A D S OF WESTERN MONTANA AND NORTHWESTERN WYOMING. Page Annotated list........................................... 20, 21 Atlantio Creek........................................ 26, 21 Beaver Dam Creek

445

THE INFLUENCE OF LOCAL AND REGIONAL OCEANOGRAPHIC PROCESSES ON PHYTOPLANKTON DISTRIBUTION IN CONTINENTAL SHELF WATERS OFF NORTH-WESTERN IRELAND  

Microsoft Academic Search

The distribution of phytoplankton is related to local and regional oceanographic features off the north-western coast of Ireland. A thermohaline front known as the Irish Shelf Front (ISF) that separates coastal and oceanic water was observed in the study area. Phytoplankton biomass levels, as indicated by chlorophyll concentrations, were higher on the coastal side of the frontal boundary. Inshore of

S. O'Boyle; R. Raine

2007-01-01

446

Detailed three-dimensional shear wave velocity structure of the northwestern United States from Rayleigh wave tomography  

E-print Network

known as the Blue Mountain Province (BMP) collided with Nevada during the mid to late JurassicDetailed three-dimensional shear wave velocity structure of the northwestern United States from a Department of Geological Sciences, University of North Carolina-Chapel Hill, Chapel Hill, NC, United States b

Fouch, Matthew J.

447

Thematic Mapper analysis to identify geomorphologic and sediment texture of El Tineh plain, north-western coast of Sinai, Egypt  

Microsoft Academic Search

Thematic Mapper data combined with field inspection are successfully applied to detect a wide variety of texture analysis of sediments and geomorphologic variability along the coastal plain of El Tineh bay at the north-western part of Sinai. Processing techniques used in this study include: image enhancement, principal component analysis (PCA), TM band ratios and supervised classification. The analysis of colour

K. H. M. DEWIDAR; O. E. Frihy

2003-01-01

448

An exceptionally well-preserved short-snouted bandicoot (Marsupialia; Peramelemorphia) from Riversleigh's Oligo-Miocene deposits, northwestern Queensland, Australia  

Microsoft Academic Search

We describe Galadi speciosus, gen. et sp nov., the second peramelemorphian (Yarala burchfieldi being the first) to be described from Oligo-Miocene deposits of Riversleigh World Heritage Property, northwestern Queensland. G. speciosus is represented by relatively complete craniodental material, including an exceptionally well-preserved skull. This taxon exhibits several apomorphies that clearly place it in the order Peramelemorphia, but it appears to

K. J. TRAVOUILLON; Y. GUROVICH; R. M. D. BECK; J. MUIRHEAD

2010-01-01

449

Expansion of Phragmites australis (Cav.) Trin. ex Steud. (Common Reed) into Typha spp. (Cattail) Wetlands in Northwestern Indiana, USA  

Microsoft Academic Search

Expansion of Phragmites australis (Cav.) Trin. ex Steud. (common reed) into stands of Typha spp. (cattail; Typha australis L. and T. x glauca) is common in the wetlands of northwestern Indiana (USA). To understand this phenomenon better, we investigated the production\\u000a of shoot sprouts and proportional allocation of biomass as well as a potential role for the water table in

Young-Moon Chun; Young D. Choi

2009-01-01

450

EMPIRICAL EVALUATION OF MODEL-DERIVED STABILITY LIMITS James L. Patton, Department of Biomedical Engineering, Northwestern University  

E-print Network

EMPIRICAL EVALUATION OF MODEL-DERIVED STABILITY LIMITS James L. Patton, Department of Biomedical Engineering, Northwestern University patton@nwu.edu> Yi-Chung Pai, Programs in Physical Therapy empirical trajectories in which balance is preserved. While Pai and Patton (1997) showed that some

Patton, James

451

The Nature of Organic Matter in the Danube River Particles and North-western Black Sea Sediments  

Microsoft Academic Search

Suspended matter and sediments from the Danube River and the adjacent north-western Black Sea were analysed for organic carbon, nitrogen and biogenic carbonate and silica, as well as for different fractions of organic matter such as amino acids and carbohydrates. In addition, the nitrogen isotopic composition of surficial sediments of the NW Black Sea was examined. Particulate organic carbon (POC)

S. Reschke; V. Ittekkot; N. Panin

2002-01-01

452

Potential impacts of northeastern Eurasian snow cover on generation of dust storms in northwestern China during spring  

NASA Astrophysics Data System (ADS)

The effects of the northeastern Eurasian snow cover on the frequency of spring dust storms in northwestern China have been examined for the period 1979-2007. Averaged over all 43 stations in northwestern China, a statistically significant relationship has been found between dust-storm frequency (DSF) and Eurasian snow-water equivalent (SWE) during spring: mean DSF of 7.4 and 3.3 days for years of high- and low SWE, respectively. Further analyses reveal that positive SWE anomalies enhance the meridional gradients of the lower tropospheric temperatures and geopotential heights, thereby strengthening westerly jets and zonal wind shear over northwestern China and western Inner Mongolia of China, the regions of major dust sources. The anomalous atmospheric circulation corresponding to the Eurasian SWE anomalies either reinforces or weakens atmospheric baroclinicity and cyclogenesis, according to the sign of the anomaly, to affect the spring DSF. This study suggests that Eurasian SWE anomalies can be an influential factor of spring DSF in northwestern China and western Inner Mongolia of China.

Lee, Yun Gon; Ho, Chang-Hoi; Kim, Jhoon; Kim, Jinwon

2013-08-01

453

Econometrics of Models with Strategic Interaction Presenter: Elie Tamer (Northwestern) Fee: HE delegates: 90; other delegates: 720  

E-print Network

Econometrics of Models with Strategic Interaction Presenter: Elie Tamer (Northwestern) Fee: HE of the econometrics questions that arise when analyzing models with multiple decision makers interacting a set of econometric theorists, applied economists and economic theorists that will share their views

Saunders, Mark

454

General patterns of circulation, sediment fluxes and ecology of the Palamós (La Fonera) submarine canyon, northwestern Mediterranean  

Microsoft Academic Search

Currents, particle fluxes and ecology were studied in the Palamós submarine canyon (also known as the Fonera canyon), located in the northwestern Mediterranean. Seven mooring arrays equipped with current meters and sediment traps were deployed along the main canyon axis, on the canyon walls and on the adjacent slope. Additionally, local and regional hydrographic cruises were carried out. Current data

Albert Palanques; Emilio García-Ladona; Damià Gomis; Jacobo Martín; Marta Marcos; Ananda Pascual; Pere Puig; Josep-Maria Gili; Mikhail Emelianov; Sebastià Monserrat; Jorge Guillén; Joaquín Tintoré; Mariona Segura; Antoni Jordi; Simón Ruiz; Gotzon Basterretxea; Dolors Blasco; Francesc Pagès

2005-01-01

455

Vegetation and fire dynamics in different geological settings since the last ice age, Klamath Mountains, northwestern, CA  

Microsoft Academic Search

The Klamath Mountains of northwestern California are a floristic hotspot and their diversity likely results from a combination of geological, ecological and historical factors (e.g., long-term climate change). To evaluate how climate change has influenced past composition, structure, and disturbance regime of the Klamath forests in different geological settings, vegetation and fire histories from four sites, Bolan (1), Sanger (in

C. Briles; C. Whitlock; P. Bartlein

2006-01-01

456

Major changes in ice stream dynamics during deglaciation of the north-western margin of the Laurentide Ice Sheet  

Microsoft Academic Search

Victoria Island lies at the north-western limit of the former North American (Laurentide) Ice Sheet in the Canadian Arctic Archipelago and displays numerous cross-cutting glacial lineations. Previous work suggests that several ice streams operated in this region during the last (Wisconsinan) glaciation and played a major role in ice sheet dynamics and the delivery of icebergs into the Arctic Ocean.

Chris R. Stokes; Chris D. Clark; Robert Storrar

2009-01-01

457

BEAM LOSS MONITORING AT THE CLIC TEST FACILITY 3 T. Lefvre, M. Velasco, M. Wood, Northwestern University, Evanston, USA  

E-print Network

W average beam power, the CLIC test facility 3 (CTF3) is a machine where the control of beam losses of the third test facility, named CTF3 [3]. As a prototype of the CLIC Drive Beam, CTF3 is built with the aim of demonstrating the feasibility of the project. Northwestern University, as a member of the CTF3 collaboration [4

458

In Preparation for Northwestern Students Study Abroad in South Africa Feb 2, 2011 International Program Development (IPD)  

E-print Network

newspapers, not just politics but sports and entertainment news. If you are interested in health care, find.ipd.northwestern.edu Interview with Kathryn Mathers, Visiting Scholar, Department of Cultural Anthropology, Duke University is understood in relation to other Americans and to diversity at home rather than between Americans and citizens

Shahriar, Selim

459

Empirical ground-motion prediction equations for northwestern Turkey using the aftershocks of the 1999 Kocaeli earthquake  

Microsoft Academic Search

We present ground motion models for northwestern Turkey using the aftershocks of the Mw 7.4, 1999 Kocaeli earthquake. We consider 4047 velocity and acceleration records for each component of motion, from 528 earthquakes recorded by stations belonging to regional networks. The ground motion models obtained provide peak ground velocity, peak ground acceleration, and spectral accelerations for 8 different frequencies between

D. Bindi; S. Parolai; H. Grosser; C. Milkereit; E. Durukal

2007-01-01

460

Responses of deep-water shrimp populations to intermediate nepheloid layer detachments on the Northwestern Mediterranean continental margin  

Microsoft Academic Search

A clear link between the distribution of intermediate nepheloid layer detachments on the Northwestern Mediterranean continental margin and the population structure of five congeneric megafaunal species of deep-water benthic shrimps inhabiting different depth ranges between 100 and 1100m was found. The results of the multidisciplinary approach presented in this study provide evidence for the ecological conditions that affect the spatial

Pere Puig; Francesc Sardà; Albert Palanques

2001-01-01

461

[Digenea of Haliaeetus albicilla (Linnaeus, 1758) and Pandion haliaetus (Linnaeus, 1758) from middle and north-western Poland].  

PubMed

In 2003-2008 eight white-tailed eagles and two ospreys from middle and north-western Poland were examined for the presence of parasites. Nine birds were infected with 5 digenean species: Conodiplostomum perlatum, Paracoenogonimus ovatus, Strigeafalconis, Metorchis crassiusculus and Nematostrigea serpens. M. crassiusculus was found for the first time in an eagle from Poland. PMID:19338229

Kalisi?ska, Elzbieta; Rzad, Izabella; Sitko, Jilji; Kavetska, Katarzyna M; Królaczyk, Katarzyna; Budis, Halina

2008-01-01

462

Crustal thickness estimates of Northwestern South America and their relation to the presence of batholithic bodies of economy interest  

Microsoft Academic Search

A new model for the crustal evolution of northwestern South America (-8 S to 23.5 N, -90 W to -58.5 W) was developed from gravity derived MOHO depth estimates and tectonic features interpreted from correlative geopotential anomalies and seismic data. Crustal thickness estimates provide important constraints on the distribution of volcanic and seismic hazards, and mineral and energy deposits. Crustal

O. Hernandez; R. R. von Frese; L. M. Potts

2007-01-01

463

Keeanga-Yamahtta Taylor Phone: 773-616-0230 E-Mail: keeanga@u.northwestern.edu  

E-print Network

Keeanga-Yamahtta Taylor Phone: 773-616-0230 E-Mail: keeanga@u.northwestern.edu Education Ph Knopp. 2012. Education and capitalism: struggles for learning and liberation. Chicago, Illinois, Latinos and the New Civil Rights Movement." Counterpunch Magazine, May 8, 2006. "Poverty USA

464

Possible Vector Dissemination by Swift Foxes following a Plague Epizootic in Black-tailed Prairie Dogs in Northwestern Texas  

Microsoft Academic Search

To determine whether swift foxes (Vulpes velox) could facilitate transmission of Yersinia pestis to uninfected black-tailed prairie dog (Cynomys ludovicianus) colonies by ac- quiring infected fleas, ectoparasite and sero- logic samples were collected from swift foxes living adjacent to prairie dog towns during a 2004 plague epizootic in northwestern Texas, USA. A previous study (1999-2001) indicated that these swift foxes

Brady K. McGee; Matthew J. Butler; Danny B. Pence; James L. Alexander; Janet B. Nissen

465

An association between urinary cadmium and urinary stone disease in persons living in cadmium-contaminated villages in northwestern Thailand: A population study  

SciTech Connect

Excessive urinary calcium excretion is the major risk of urinary stone formation. Very few population studies have been performed to determine the relationship between environmental cadmium exposure and urinary stone disease. This population-based study examined an association between urinary cadmium excretion, a good biomarker of long-term cadmium exposure, and prevalence of urinary stones in persons aged 15 years and older, who lived in the 12 cadmium-contaminated villages in the Mae Sot District, Tak Province, northwestern Thailand. A total of 6748 persons were interviewed and screened for urinary cadmium and urinary stone disease in 2009. To test a correlation between urinary excretion of cadmium and calcium, we measured urinary calcium content in 1492 persons, who lived in 3 villages randomly selected from the 12 contaminated villages. The rate of urinary stones significantly increased from 4.3% among persons in the lowest quartile of urinary cadmium to 11.3% in the highest quartile. An increase in stone prevalence with increasing urinary cadmium levels was similarly observed in both genders. Multiple logistic regression analysis revealed a positive association between urinary cadmium levels and stone prevalence, after adjusting for other co-variables. The urinary calcium excretion significantly increased with increasing urinary cadmium levels in both genders, after adjusting for other co-variables. Elevated calciuria induced by cadmium might increase the risk of urinary stone formation in this environmentally exposed population. - Research highlights: {yields} Excessive calciuria is the major risk of urinary stone formation. {yields} We examine cadmium-exposed persons for urinary cadmium, calcium, and stones. {yields} The rate of urinary stones increases with increasing urinary cadmium. {yields} Urinary calcium excretion increases with increasing urinary cadmium. {yields} Elevated calciuria induced by cadmium may increase the risk of urinary stones.

Swaddiwudhipong, Witaya, E-mail: swaddi@hotmail.com [Department of Community and Social Medicine, Mae Sot General Hospital, Tak 63110 (Thailand)] [Department of Community and Social Medicine, Mae Sot General Hospital, Tak 63110 (Thailand); Mahasakpan, Pranee [Department of Community and Social Medicine, Mae Sot General Hospital, Tak 63110 (Thailand)] [Department of Community and Social Medicine, Mae Sot General Hospital, Tak 63110 (Thailand); Limpatanachote, Pisit; Krintratun, Somyot [Department of Internal Medicine, Mae Sot General Hospital, Tak 63110 (Thailand)] [Department of Internal Medicine, Mae Sot General Hospital, Tak 63110 (Thailand)

2011-05-15

466

Origin of the Early Permian zircons in Keping basalts and magma evolution of the Tarim Large Igneous Province (northwestern China)  

NASA Astrophysics Data System (ADS)

The Tarim continental flood basalts (CFBs) provide important clues about the genesis and magmatic evolution of the Early Permian Tarim Large Igneous Province (Tarim LIP) in northwestern China. Here we present results of LA-MC-ICPMS Lu-Hf isotope analysis on Early Permian (ca. 290 Ma) zircons extracted from the Tarim CFBs in the Keping area, northwest of the Tarim Basin. Zircons from two sub-groups of Keping basalts (Groups 1a and 1b) have similar Lu-Hf isotopic compositions and exhibit a relatively large range of 176Hf/177Hf ratios between 0.282422 and 0.282568. Their negative ?Hf(t) values (- 6.8-- 1.4) are generally lower than the whole-rock ?Hf(t) values of their host basalts (- 2.8-2.1), and are distinct from other known intrusive rocks (- 0.3-7.1) in the Tarim LIP and their hosted zircons (4.9-8.8). Systematic studies of Hf isotopic data from Tarim and its adjacent regions reveal that these zircons are probably xenocrysts, sourced from coeval igneous rocks in the South Tianshan Orogen (e.g., the Lower Permian Xiaotikanlike Formation volcanic and pyroclastic rock suite). This, together with the presence of Precambrian zircons in Keping basalts, clearly indicates crustal contamination during their eruptions and provides hints about the potential contaminant sources. Geochemical modeling further suggests that the earlier erupted Group 1b basalts experienced more contamination, predominantly by some high Th-U-Pb rock components, most likely from the South Tianshan Orogen. The later erupted Group 1a basalts in the Keping area have been less contaminated with mainly the Tarim Precambrian rocks. Another group of the Tarim CFBs in the Northern Tarim Uplift (Group 2) appears to have undergone negligible crustal contamination but possesses evidence for variable source compositions. The modeling also indicates that the uncontaminated parental magmas of various Tarim LIP rocks (from the picrites and basalts to ultramafic-mafic and syenitic intrusive rocks) exhibit a wide range of ?Nd(t) values (ca. - 5-5), reflecting source isotopic heterogeneity, which may be a consequence of plume-lithosphere interaction during the generation of the Tarim LIP.

Li, Yin-Qi; Li, Zi-Long; Yu, Xing; Langmuir, Charles H.; Santosh, M.; Yang, Shu-Feng; Chen, Han-Lin; Tang, Zhong-Li; Song, Biao; Zou, Si-Yuan

2014-09-01

467

Galaxy formation  

PubMed Central

It is argued that within the standard Big Bang cosmological model the bulk of the mass of the luminous parts of the large galaxies likely had been assembled by redshift z ? 10. Galaxy assembly this early would be difficult to fit in the widely discussed adiabatic cold dark matter model for structure formation, but it could agree with an isocurvature version in which the cold dark matter is the remnant of a massive scalar field frozen (or squeezed) from quantum fluctuations during inflation. The squeezed field fluctuations would be Gaussian with zero mean, and the distribution of the field mass therefore would be the square of a random Gaussian process. This offers a possibly interesting new direction for the numerical exploration of models for cosmic structure formation. PMID:9419326

Peebles, P. J. E.

1998-01-01

468

ANTIBODY FORMATION  

PubMed Central

The suppression of antibody formation by passively administered antibody is influenced by the dose and nature of the antigen, type of immunization procedure, ratio of antibody to antigen, species origin and characteristics of the antiserum used, as well as the species selected for immunization. In guinea pigs, diphtheria antitoxin formation can be effectively suppressed by an intravenous injection of excess homologous or heterologous antitoxin as long as 5 days after toxoid immunization and after delayed-type hypersensitivity to toxoid has developed. Following the period of antibody suppression which lasts 2 to 7 weeks, serum antibody can usually be demonstrated. It is proposed that this delayed immunization results from dissociation of antigen, since diphtheritic paralysis and death can be produced in guinea pigs and rabbits by the intravenous injection of toxin-antitoxin precipitates formed in antitoxin excess. This syndrome is prevented by injection of excess horse antitoxin 1 hour after injection of the toxin-antitoxin complexes. PMID:13779027

Uhr, Jonathan W.; Baumann, Joyce B.

1961-01-01

469

Cloud Formation  

NASA Astrophysics Data System (ADS)

Cloud formation is crucial to the heritage of modern physics, and there is a rich literature on this important topic. In 1927, Charles T.R. Wilson was awarded the Nobel Prize in physics for applications of the cloud chamber.2 Wilson was inspired to study cloud formation after working at a meteorological observatory on top of the highest mountain in Scotland, Ben Nevis, and testified near the end of his life, "The whole of my scientific work undoubtedly developed from the experiments I was led to make by what I saw during my fortnight on Ben Nevis in September 1894."3 To form clouds, Wilson used the sudden expansion of humid air.4 Any structure the cloud may have is spoiled by turbulence in the sudden expansion, but in 1912 Wilson got ion tracks to show up by using strobe photography of the chamber immediately upon expansion.5 In the interim, Millikan's study in 1909 of the formation of cloud droplets around individual ions was the first in which the electron charge was isolated. This study led to his famous oil drop experiment.6 To Millikan, as to Wilson, meteorology and physics were professionally indistinct. With his meteorological physics expertise, in WWI Millikan commanded perhaps the first meteorological observation and forecasting team essential to military operation in history.7 But even during peacetime meteorology is so much of a concern to everyone that a regular news segment is dedicated to it. Weather is the universal conversation topic, and life on land could not exist as we know it without clouds. One wonders then, why cloud formation is never covered in physics texts.

Graham, Mark Talmage

2004-05-01

470

Fossil formation  

NSDL National Science Digital Library

The National Science Education Standards Life Science Content Standard mentions that fossils indicate extinct species and contribute to an understanding of evolution and diversity. The Earth and Space Sciences Content Standard tells us they provide clues about past environments. But what is a fossil? How does it form? The processes can be complex. An understanding of fossil formation will enable accurate student conceptions of related science concepts including methods of science in geology, paleontology, and evolution.

University, Staff A.

2008-03-07

471

New records of Cantharellus species from the northwestern Himalayas of India  

PubMed Central

This study investigated several collections of the genus Cantharellus (Cantharellaceae) from the northwestern Himalayas, India, on the basis of morphology and molecular data. Phylogenetic relationships and species limits were investigated by using nuclear ribosomal large subunit sequences (LSU). We recognized 13 species: Cantharellus appalachiensis Petersen, C. cibarius Fries, C. lateritius (Berk) Singer, C. miniatescens Heinem, C. minor Peck, C. pseudoformosus and seven species, C. applanatus sp. nov., C. elongatipes sp. nov., C. fibrillosus sp. nov., C. himalayensis sp. nov., C. indicus sp. nov., C. natarajanii sp. nov., and C. umbonatus sp. nov., as new to science. All these species are described and their taxonomy and ecology are discussed. In addition, a key is provided to all the recognized species. The phylogenetic analysis recovered 10 major supported clades of Cantharellus species. PMID:24587961

Deepika, Kumari; Reddy, M. Sudhakara; Upadhyay, Ramesh C.

2014-01-01

472

Upper Triassic spongiomorph and coral association dredged off the northwestern Australian shelf  

NASA Astrophysics Data System (ADS)

Upper Triassic corals and spongiomorphs dredged during BMR Cruise 95 from the Rowley Terrace, offshore Canning Basin of northwestern Australia, indicate possible new occurrences of reef facies. These are comparable to counterparts known from the Norhtern Limestone Alps of central Europe. A branching spongiomorph, represented by the genus Spongiomorpha sp. and two coral taxa, Pamiroseris rectilamellosa (Winkler) and Retiophyllia tellae (Stoppani), are reported herein. Collectively, these fossils indicate a Late Triassic (Noria-Rhaetian) age. Although different in taxonomic composition, the fauna compares with one previously reported from a Late Triassic Ocean Drilling Project reef site (site 764) on the Wombat Plateau, some 350 km to the west. The Rowley Terrace occurrences may represent an eastward extension of the Wombat reefs, developed along the rifted margin of Gondwana.

Stanley, G. D.

473

Holocene vegetation histories from three sites in the Tundra of Northwestern Quebec, Canada  

SciTech Connect

Two pollen diagrams from lakes north of treeline in northwestern Quebec indicate that Picea never extended north of its present-day limit during the past 6000 yr BP. Alnus crispa was slightly more abundant around 5000 BP, but there are few major changes in the vegetation of the region during the Holocene. A third site in the tundra along Hudson Bay has a slightly longer sequence (7000 yr BP) which indicates more open conditions in the early and recent part of the record. Picea may have been more abundant locally around 3000 BP. Few major changes in these diagrams can be unequivocally attributed to local changes in plant abundance; changes in tree and shrub pollen abundance parallel those seen south of treeline.

Gajewski, K. (Univ. d'Ottawa, Ontario (Canada)); Garralla, S.

1992-11-01

474

Determination of the trophic situation in Gheshlagh reservoir (North-Western Iran).  

PubMed

'Trophic state' is often used to classify aquatic ecosystems according to biotic productivity. Carlson trophic state indices were used to assess the trophic situation in Gheshlagh reservoir (North-Western Iran), on which a dam was constructed three decades ago. Using data from a one-year surface sampling, a comparison of the trophic state index (TSI), between four sampling points in the reservoir and one sampling point under the dam, was performed. The results of the TSI calculated based on chlorophyll a (chl. a) concentration and Secchi depth showed that the aquatic environment in the reservoir is eutrophied (50 < TSI < 80), while it is mesotrophic (40 < TSI < 50) under the dam. Moreover, the measured concentrations of chl. a and phosphate were consistent with the available data ranges on eutrophication. In addition, it was shown that algal biomass bloom occurred at the end of spring, all over the sampling points. PMID:22629625

Rezaei, Fariba; Zadeh, Hamed Ghader; Van Damme, Patrick

2012-01-01

475

Mercury levels in raccoons (Procyon lotor) from the Warta Mouth National Park, northwestern Poland.  

PubMed

This is the first report on mercury (Hg) levels in the liver, kidney, skeletal muscle, and brain of raccoon in Europe. It studied Hg concentration in 24 raccoons from the Warta Mouth National Park, northwestern Poland by atomic absorption spectroscopy (AAS). The highest total Hg concentrations in the raccoon were found in the liver (maximum, 18.45 mg/kg dry weight), while the lowest in the brain (maximum, 0.49 mg/kg dw). In adult raccoons, Hg concentrations in the liver, kidney, and brain were higher than in immature individuals (p<0.001), while similar in skeletal muscle in both age groups. Our results are consistent with studies by other authors conducted in North America in areas with similar environmental conditions. PMID:24736978

Lanocha, Natalia; Kalisinska, Elzbieta; Kosik-Bogacka, Danuta I; Budis, Halina; Podlasinska, Joanna; Jedrzejewska, Ewa

2014-06-01

476

Ecological niche of three teuthophageous odontocetes in the northwestern Mediterranean Sea  

NASA Astrophysics Data System (ADS)

In the northwestern Mediterranean Sea, sperm whales, pilot whales and Risso's dolphins prey on cephalopods exclusively or preferentially. In order to evaluate their competition, we modelled their habitat suitability with the Ecological Niche Factor Analysis (ENFA) and compared their ecological niche using a discriminant analysis. We used a long term (1995-2005) small boat data set, with visual and acoustic (sperm whale) detections. Risso's dolphin had the shallowest and the more spatially restricted principal habitat, mainly located on the upper part of the continental slope (640 m mean depth). With a wider principal habitat, at 1750 m depth in average, the sperm whale used a deeper part of the slope as well as close offshore waters. Finally, the pilot whale has the most oceanic habitat (2500 m mean depth) mainly located in the central Ligurian Sea and Provençal basin. Therefore, potential competition for food between these species may be reduced by the differentiation of their ecological niches.

Praca, E.; Gannier, A.

2007-10-01

477

Ecological niches of three teuthophageous odontocetes in the northwestern Mediterranean Sea  

NASA Astrophysics Data System (ADS)

In the northwestern Mediterranean Sea, sperm whales, pilot whales and Risso's dolphins prey exclusively or preferentially on cephalopods. In order to evaluate their competition, we modelled their habitat suitability with the Ecological Niche Factor Analysis (ENFA) and compared their ecological niches using a discriminant analysis. We used a long term (1995-2005) small boat data set, with visual and acoustic (sperm whale) detections. Risso's dolphin had the shallowest and the more spatially restricted principal habitat, mainly located on the upper part of the continental slope (640 m mean depth). With a wider principal habitat, at 1750 m depth in average, the sperm whale used a deeper part of the slope as well as the closest offshore waters. Finally, the pilot whale has the most oceanic habitat (2500 m mean depth) mainly located in the central Ligurian Sea and Provençal basin. Therefore, potential competition for food between these species may be reduced by the differentiation of their habitats.

Praca, E.; Gannier, A.

2008-02-01

478

Parasitological survey on wild carnivora in north-western Tohoku, Japan.  

PubMed

In the winter of 1997-1998, we collected parasitological data from 60 wild carnivora in the north-western part of Tohoku region, Japan. These included 7 foxes (Vulpes vulpes japonica), 20 raccoon dogs (Nyctereutes procyonoides viverrinus), 29 martens (Martes melampus melampus), 3 weasels (two Mustela sibirica itatsi and one M. nivalis namiyei), and one Japanese badger (Meles meles anakuma). Roundworms (Toxocara canis in foxes and Toxocara tanuki in raccoon dogs), hookworms (Ancylostoma kusimaense and Arthrostoma miyazakiense) and Molineus sp. in the small intestine were the most prevalent in foxes and raccoon dogs. In martens, Aonchotheca putorii in the stomach, Concinnum ten in the pancreatic duct, Molineus sp. and Euryhelmis costaricensis in the small intestine were the most prevalent. Collected parasites include some new helminth species for this region or Japan; the strobilar stage of Taenia polyacantha from foxes, Pygidliopsis summa from a raccoon dog, Eucoleus aerophilus, A. putorii, and Soholiphyme baturini from martens. PMID:10535507

Sato, H; Inaba, T; Ihama, Y; Kamiya, H

1999-09-01

479

Determination of six metals in galician red wines (in northwestern Spain) by capillary electrophoresis.  

PubMed

A simple technique is described for the routine simultaneous capillary electrophoretic determination of 6 cations in wine. Separation was achieved on a fused silica capillary column with a UV-Cat-1, alpha-hydroxysobutyric acid and 18-crown-6-ether buffer at pH 4.5 and indirect UV detection at 214 nm. The content of magnesium, sodium, potassium, calcium, manganese, and lithium was determined. The method is quantitative, with recoveries in the 92-102% range, and linear over more than one order of magnitude. The precision is better than 2.5-3.4%. The method is sensible, with detection limits between 0.01 and 0.06 mg/L. Twenty-five red wines with a Certified Brand of Origin from Galicia (north-western Spain) were analyzed by the proposed method. Various wines showed very similar electrophoretic profiles, but significant quantitative differences were observed. PMID:10693019

Núñez, M; Peña, R M; Herrero, C; García, S

2000-01-01

480

Microscale strain partitioning? Differential quartz lattice preferred orientation development in micaceous phyllite, Hindu Kush, northwestern Pakistan  

NASA Astrophysics Data System (ADS)

Spatially referenced quartz c axis fabrics demonstrate the preservation of multiple, distinct fabrics in a specimen collected from northwestern Pakistan. The overall fabric yielded by the specimen is dominated by a single population of quartz grains, while the fabric signatures of two other unique, spatially distinct populations are overwhelmed. It is these minor fabrics, however, that provide information on temperature of deformation (403 ± 50 °C), differential stress (8.6 + 2.6/-1.5 MPa to 15.0 +3.8/-2.5 MPa), strain rate (10-16 s-1 to 10-15 s-1), and strain partitioning recorded by the specimen. This work highlights the potential importance of using spatially referenced data when conducting lattice preferred orientation analyses.

Larson, K. P.; Lamming, J. L.; Faisal, S.

2014-09-01

First Page Previous Page 1 2 3 4 5 6 7 8 9 10