Science.gov

Sample records for reworks

  1. Reworking professional nursing identity.

    PubMed

    MacIntosh, Judith

    2003-10-01

    In spite of professional socialization through nursing education programs, new graduates experience stress as they become working professionals. This grounded theory study explores experienced nurses' perceptions of how they became professional. The central problem for nurses was dissonance between expectations and experiences; they addressed this through an iterative, three-stage process of reworking professional identity. The stages of this process are assuming adequacy, realizing practice, and developing a reputation. Iterations of this process occur as new discrepancies are noticed, enhanced awareness dawns, practice changes, learning is undertaken, or experienced nurses become relative novices in another work area. Nurses move through stages more quickly and at different levels with each iteration. Three contextual factors influence the process: expectation; perception of the status accorded by others to nursing; and supportiveness by acceptance, assistance, and advocacy from others in the workplace. These findings expand knowledge about professional socialization and how nurses themselves understand developing professional identity.

  2. Reworking Seventeenth-Century Saltpetre.

    PubMed

    Robertson, Haileigh

    2016-05-01

    In the early modern period, saltpetre was perhaps best known for its role as one of the three components of gunpowder. For natural philosophers in seventeenth-century England, saltpetre also had important uses in chymistry and medicine. While some factories did successfully produce saltpetre in early modern England, the domestic industry was not on the whole a great success. Intellectuals who were keen to apply their knowledge in the real world saw this as an opportunity, and proposed a variety of new and improved methods that they claimed would produce this vital material more efficiently and in abundance. Yet their proposals remained on the page and their efforts fell flat. To understand the challenges and experiences faced by both scholars and artisan saltpetre-makers, I 'reworked' early modern methods of saltpetre-making with the Medieval Gunpowder Research Group. Reworking revealed procedural challenges and complexities that explain why, even with the best intentions, seventeenth-century natural philosophers struggled to get to grips with this important material.

  3. 7 CFR 29.3053 - Rework.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 7 Agriculture 2 2010-01-01 2010-01-01 false Rework. 29.3053 Section 29.3053 Agriculture Regulations of the Department of Agriculture AGRICULTURAL MARKETING SERVICE (Standards, Inspections, Marketing... Rework. Any lot of Type 31 tobacco which needs to be restored or otherwise rearranged to prepare...

  4. 7 CFR 29.2293 - Rework.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 7 Agriculture 2 2010-01-01 2010-01-01 false Rework. 29.2293 Section 29.2293 Agriculture Regulations of the Department of Agriculture AGRICULTURAL MARKETING SERVICE (Standards, Inspections, Marketing..., including: (a) Tobacco which is so mixed that it cannot be classified properly in any grade of the...

  5. 7 CFR 29.2545 - Rework.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 7 Agriculture 2 2010-01-01 2010-01-01 false Rework. 29.2545 Section 29.2545 Agriculture Regulations of the Department of Agriculture AGRICULTURAL MARKETING SERVICE (Standards, Inspections, Marketing...) Tobacco which is so mixed that it cannot be classified properly in any grade of the type, because the...

  6. 7 CFR 29.3542 - Rework.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 7 Agriculture 2 2010-01-01 2010-01-01 false Rework. 29.3542 Section 29.3542 Agriculture Regulations of the Department of Agriculture AGRICULTURAL MARKETING SERVICE (Standards, Inspections, Marketing..., including: (a) Tobacco which is so mixed that it cannot be classified properly in any grade of the type...

  7. 7 CFR 983.152 - Failed lots/rework procedure.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... procedure for aflatoxin. If inshell rework is selected as a remedy to meet the aflatoxin regulations of this... product shall be reported to the committee. The reworked lot shall be sampled and tested for aflatoxin as... the lot has been reworked and tested, it fails the aflatoxin test for a second time, the lot may be...

  8. 7 CFR 983.152 - Failed lots/rework procedure.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... procedure for aflatoxin. If inshell rework is selected as a remedy to meet the aflatoxin regulations of this... product shall be reported to the committee. The reworked lot shall be sampled and tested for aflatoxin as... the lot has been reworked and tested, it fails the aflatoxin test for a second time, the lot may...

  9. 7 CFR 983.152 - Failed lots/rework procedure.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... procedure for aflatoxin. If inshell rework is selected as a remedy to meet the aflatoxin regulations of this... product shall be reported to the committee. The reworked lot shall be sampled and tested for aflatoxin as... the lot has been reworked and tested, it fails the aflatoxin test for a second time, the lot may...

  10. 7 CFR 983.152 - Failed lots/rework procedure.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... procedure for aflatoxin. If inshell rework is selected as a remedy to meet the aflatoxin regulations of this... product shall be reported to the committee. The reworked lot shall be sampled and tested for aflatoxin as... the lot has been reworked and tested, it fails the aflatoxin test for a second time, the lot may...

  11. Column Grid Array Rework for High Reliability

    NASA Technical Reports Server (NTRS)

    Mehta, Atul C.; Bodie, Charles C.

    2008-01-01

    Due to requirements for reduced size and weight, use of grid array packages in space applications has become common place. To meet the requirement of high reliability and high number of I/Os, ceramic column grid array packages (CCGA) were selected for major electronic components used in next MARS Rover mission (specifically high density Field Programmable Gate Arrays). ABSTRACT The probability of removal and replacement of these devices on the actual flight printed wiring board assemblies is deemed to be very high because of last minute discoveries in final test which will dictate changes in the firmware. The questions and challenges presented to the manufacturing organizations engaged in the production of high reliability electronic assemblies are, Is the reliability of the PWBA adversely affected by rework (removal and replacement) of the CGA package? and How many times can we rework the same board without destroying a pad or degrading the lifetime of the assembly? To answer these questions, the most complex printed wiring board assembly used by the project was chosen to be used as the test vehicle, the PWB was modified to provide a daisy chain pattern, and a number of bare PWB s were acquired to this modified design. Non-functional 624 pin CGA packages with internal daisy chained matching the pattern on the PWB were procured. The combination of the modified PWB and the daisy chained packages enables continuity measurements of every soldered contact during subsequent testing and thermal cycling. Several test vehicles boards were assembled, reworked and then thermal cycled to assess the reliability of the solder joints and board material including pads and traces near the CGA. The details of rework process and results of thermal cycling are presented in this paper.

  12. Reworking Exams to Teach Chemistry Content and Reinforce Student Learning

    ERIC Educational Resources Information Center

    Risley, John M.

    2007-01-01

    One meaningful approach to demonstrate to students the value of reworking exams is to offer an incentive to do so. This paper describes the strategy and effects of offering partial credit to students who rework answers originally answered incorrectly on an exam. This has proved largely successful for the last 10 years in several classes at the…

  13. Improving Naval Shipbuilding Project Efficiency through Rework Reduction

    DTIC Science & Technology

    2007-09-01

    rigidity of the design and construction process as major sources of rework. Recommendations include improving change management, optimizing the...the rigidity of the design and construction process as major sources of rework. Recommendations include improving change management, optimizing the...2. The Shipbuilding Design and Construction Process – Too Rigid for Design Changes

  14. Welding rework data acquisition and automation

    NASA Technical Reports Server (NTRS)

    Romine, Peter L.

    1996-01-01

    Aluminum-Lithium is a modern material that NASA MSFC is evaluating as an option for the aluminum alloys and other aerospace metals presently in use. The importance of aluminum-lithium is in it's superior weight to strength characteristics. However, aluminum-lithium has produced many challenges in regards to manufacturing and maintenance. The solution to these problems are vital to the future uses of the shuttle for delivering larger payloads into earth orbit and are equally important to future commercial applications of aluminum-lithium. The Metals Processes Branch at MSFC is conducting extensive tests on aluminum-lithium which includes the collection of large amounts of data. This report discusses the automation and data acquisition for two processes: the initial weld and the repair. The new approach reduces the time required to collect the data, increases the accuracy of the data, and eliminates several types of human errors during data collection and entry. The same material properties that enhance the weight to strength characteristics of aluminum-lithium contribute to the problems with cracks occurring during welding, especially during the repair/rework process. The repairs are required to remove flaws or defects discovered in the initial weld, either discovered by x-ray, visual inspection, or some other type of nondestructive evaluation. It has been observed that cracks typically appear as a result of or beyond the second repair. MSFC scientists have determined that residual mechanical stress introduced by the welding process is a primary cause of the cracking. Two obvious solutions are to either prevent or minimize the stress introduced during the welding process, or remove or reduce the stress after the welding process and MSFC is investigating both of these.

  15. 66. BUILDING NO. 554, REWORK POWDER GRINDING ROUSE, PULVERIZING, WATER ...

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

    66. BUILDING NO. 554, REWORK POWDER GRINDING ROUSE, PULVERIZING, WATER DRY HOUSE, LOOKING NORTH (DEMOLITION IN PROGRESS). - Picatinny Arsenal, 500 Area, Powder Factory & Power House, State Route 15 near I-80, Dover, Morris County, NJ

  16. 65. BUILDING NO. 554, REWORK POWDER GRINDING HOUSE, PULVERIZING, WATER ...

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

    65. BUILDING NO. 554, REWORK POWDER GRINDING HOUSE, PULVERIZING, WATER DRY HOUSE, LOOKING SOUTH AT NORTH SIDE (DEMOLITION IN PROGRESS) OF BUILDING ONCE USED FOR REWORK POWDER GRINDING AND PULVERIZING (SEE NJ-36-C-33 FOR DIAGRAM OF THIS RECLAMATION PROCESS). THIS BUILDING ALSO SERVED AS A WATER DRY HOUSE. - Picatinny Arsenal, 500 Area, Powder Factory & Power House, State Route 15 near I-80, Dover, Morris County, NJ

  17. Lacie phase 1 Classification and Mensuration Subsystem (CAMS) rework experiment

    NASA Technical Reports Server (NTRS)

    Chhikara, R. S.; Hsu, E. M.; Liszcz, C. J.

    1976-01-01

    An experiment was designed to test the ability of the Classification and Mensuration Subsystem rework operations to improve wheat proportion estimates for segments that had been processed previously. Sites selected for the experiment included three in Kansas and three in Texas, with the remaining five distributed in Montana and North and South Dakota. The acquisition dates were selected to be representative of imagery available in actual operations. No more than one acquisition per biophase were used, and biophases were determined by actual crop calendars. All sites were worked by each of four Analyst-Interpreter/Data Processing Analyst Teams who reviewed the initial processing of each segment and accepted or reworked it for an estimate of the proportion of small grains in the segment. Classification results, acquisitions and classification errors and performance results between CAMS regular and ITS rework are tabulated.

  18. The Automated Aircraft Rework System (AARS): A system integration approach

    NASA Technical Reports Server (NTRS)

    Benoit, Michael J.

    1994-01-01

    The Mercer Engineering Research Center (MERC), under contract to the United States Air Force (USAF) since 1989, has been actively involved in providing the Warner Robins Air Logistics Center (WR-ALC) with a robotic workcell designed to perform rework automated defastening and hole location/transfer operations on F-15 wings. This paper describes the activities required to develop and implement this workcell, known as the Automated Aircraft Rework System (AARS). AARS is scheduled to be completely installed and in operation at WR-ALC by September 1994.

  19. 7 CFR 983.152 - Failed lots/rework procedure.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... 7 Agriculture 8 2011-01-01 2011-01-01 false Failed lots/rework procedure. 983.152 Section 983.152 Agriculture Regulations of the Department of Agriculture (Continued) AGRICULTURAL MARKETING SERVICE (Marketing Agreements and Orders; Fruits, Vegetables, Nuts), DEPARTMENT OF AGRICULTURE PISTACHIOS GROWN IN...

  20. 7 CFR 983.52 - Failed lots/rework procedure.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... 7 Agriculture 8 2011-01-01 2011-01-01 false Failed lots/rework procedure. 983.52 Section 983.52 Agriculture Regulations of the Department of Agriculture (Continued) AGRICULTURAL MARKETING SERVICE (Marketing Agreements and Orders; Fruits, Vegetables, Nuts), DEPARTMENT OF AGRICULTURE PISTACHIOS GROWN IN...

  1. 7 CFR 983.52 - Failed lots/rework procedure.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    .... Each lot of substandard pistachios may be reworked to meet aflatoxin or quality requirements. The... reporting. If a lot fails to meet the aflatoxin and/or the quality requirements of this part, a failed lot.... This form must be completed and submitted to the committee each time a lot fails either aflatoxin or...

  2. 7 CFR 983.52 - Failed lots/rework procedure.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    .... Each lot of substandard pistachios may be reworked to meet aflatoxin or quality requirements. The... reporting. If a lot fails to meet the aflatoxin and/or the quality requirements of this part, a failed lot.... This form must be completed and submitted to the committee each time a lot fails either aflatoxin...

  3. 7 CFR 983.52 - Failed lots/rework procedure.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    .... Each lot of substandard pistachios may be reworked to meet aflatoxin or quality requirements. The... reporting. If a lot fails to meet the aflatoxin and/or the quality requirements of this part, a failed lot.... This form must be completed and submitted to the committee each time a lot fails either aflatoxin...

  4. 7 CFR 983.52 - Failed lots/rework procedure.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    .... Each lot of substandard pistachios may be reworked to meet aflatoxin or quality requirements. The... reporting. If a lot fails to meet the aflatoxin and/or the quality requirements of this part, a failed lot.... This form must be completed and submitted to the committee each time a lot fails either aflatoxin...

  5. Reworking Exams To Teach Chemistry Content and Reinforce Student Learning

    NASA Astrophysics Data System (ADS)

    Risley, John M.

    2007-09-01

    One meaningful approach to demonstrate to students the value of reworking exams is to offer an incentive to do so. This paper describes the strategy and effects of offering partial credit to students who rework answers originally answered incorrectly on an exam. This has proved largely successful for the last 10 years in several classes at the collegiate level. In the grading scheme used, the average percentage of the regrade on the final course grade is approximately 2 3%. While the regrade makes little difference in the final course grade for the majority of students, students are very appreciative of the opportunity afforded them, and this often changes their perspective of the class and the morale to a more positive attitude. Teachers in high school and in other disciplines may benefit from this approach.

  6. Study on thermally reworkable underfills for flip chip, BGA, and CSP applications

    NASA Astrophysics Data System (ADS)

    Wang, Lejun

    Underfill is a polymeric material used in the flip-chip devices that fills the gap between an integrated circuit (IC) chip and an organic printed wiring board (PWB), and encapsulates the solder interconnects. This underfill material dramatically enhances the reliability of the flip-chip devices as compared to the non-underfilled devices. Current underfills are mainly epoxy-based materials that are not reworkable after curing, which places an obstacle in Flip-Chip on Board (FCOB) technology developments. Thermally reworkable underfill is not only the key material to address the non-reworkability of the FCOB packages, but it can also be used to enhance the board-level reliability of ball grid array (BGA) and chip scale package (CSP) devices without losing their good reworkability feature. In this work, three approaches for developing thermally reworkable underfills including syntheses of thermally degradable epoxies, incorporation of special additives into standard epoxy matrix, and utilization of thermoplastic-thermoset copolymers/blends are studied. Based on these studies, reworkable underfills are then developed. Reworkable underfills developed in-house and from commercial sources are then evaluated for their reworkability and reliability to the encapsulation of FCOB, BGA, and CSP. To begin with, various thermal degradable epoxies containing carbonate or carbamate linkdage are synthesized and characterized. Among them, two diepoxides that decompose around solder reflow temperature and have good overall properties are selected and formulated into reworkable underfills for conventional capillary-flow underfilling process. A group of additives named chemical blowing agents are identified to have the capability to make the epoxy removable under certain conditions when they are incorporated into a standard epoxy matrix. Interactions between the additives and the typical epoxy formulation are thoroughly studied for the purpose of identifying good additives that provide

  7. Natural Reworking of Tsunami Evidence in Chandipur Beach, India

    NASA Astrophysics Data System (ADS)

    Ghosh, T.; Mukhopadhyay, A.

    2010-12-01

    In a particular tide- or wave- dominated environment the flow energy is best understood by the size of the sand grains deposited at the respective bar or beach or the depositional platform. Though the flow energy is generally fluctuating in this kind of dynamic environment, the overall set up can represent a particular domain of energy regime. A particular range of grain size is supposed to be deposited laterally and vertically as well. A specific trend of variation in grain size is also expected and can be estimated from both the hydrodynamic and aerodynamic interplay or in combination. Hence, whenever any stratum with an extra ordinary grain size is observed, that usually stimulates to think about some sudden and extraordinary energy regime, indicate a catastrophic event. In the year 2005, on Chandipur beach (Orissa, India) such a stratum found with an unusual grain size, which was much coarser than the usual grains¬ extended along the beach and outer flank of the main bar, exhibited many unusual features in its morphology and mineralogy indicated a possible deposit due to the great Indian Ocean tsunami of 2004. In the contrary, the same deposit is exhibiting the definite reworking due to the normal beach process in 2008. It’s a definite signature of gap of information in a dynamic environment and a challenge for the palaeo-tsunami researchers. Key words: Tsunami deposit; Beach dynamics; Natural reworking

  8. Occupational disease surveillance of an aircraft rework facility.

    PubMed

    Fung, F; Bundy, M; Kennon, R

    1990-11-01

    Analysis of the 1987-1988 morbidity data of an aircraft rework facility's 6,672 employees identified 118 patients with occupational diseases. In our study, 61 cases (52%) involved eye and skin conditions. This was comparable to the State of California occupational diseases report. However, systemic conditions appeared to be higher (24% vs. 7%) in the study group, and this finding may need further investigation to clarify its significance. Patients employed as craftworkers accounted for nearly half of all reported occupational diseases. Federal workers in this facility appeared to have a higher percentage (70%) of "no time lost" when compared with that of the State of California report (54%). The utility of morbidity data in the prevention of occupational diseases is discussed.

  9. In situ reworking /gardening/ of the lunar surface - Evidence from the Apollo cores

    NASA Technical Reports Server (NTRS)

    Morris, R. V.

    1978-01-01

    The in situ reworking (gardening) of the lunar surface by impacting projectiles creates an in situ reworking zone extending horizontally over the entire regolith surface and extending vertically from the surface to a depth which varies from place-to-place on the moon. On the basis of available evidence, the 'high-maturity' zones observed at the top of the lunar cores have resulted from the in situ reworking of the present-day lunar surface. The temporal variation of the in situ reworking depth was investigated using depths inferred from maturity I sub s/FeO and Al-26 profiles of Apollo cores. The observed temporal variation of the in situ reworking depth in units of centimeters is equal to 2.2 times the time (in units of million years) to the 0.45th power.

  10. Reworked nannofossils from the Lower Miocene deposits in the Magura Nappe (Outer Western Carpathians, Poland)

    NASA Astrophysics Data System (ADS)

    Oszczypko-Clowes, Marta

    2012-11-01

    Studies, based on calcareous nannofossils, proved that the level of reworked microfossils had so far been underestimated. More recently detailed quantitative studies of calcareous nannoplankton of the Magura, Malcov, Zawada and Kremna formations from the Magura Nappe in Poland documented a degree of nannofossil recycling among those formations. In the Late Eocene-Early Oligocene pelagic Leluchów Marl Member of the Malcov Formation the level of redeposition is very low (0-3.80 %), however, in the flysch deposits of the Malcov Formation reworking increased to 31.4 %. Late Oligocene through Early Miocene “molasse” type deposits of the Zawada and Kremna formations contain 43.7-69.0 % of reworked nannofossils. Quantitative analyses of the reworked assemblages confirmed the domination of Paleogene nannofossil species over Cretaceous ones. The most abundant, reworked assemblages belong to the Early- Middle Eocene age.

  11. Rework of the ERA software system: ERA-8

    NASA Astrophysics Data System (ADS)

    Pavlov, D.; Skripnichenko, V.

    2015-08-01

    The software system that has been powering many products of the IAA during decades has undergone a major rework. ERA has capabilities for: processing tables of observations of different kinds, fitting parameters to observations, integrating equations of motion of the Solar system bodies. ERA comprises a domain-specific language called SLON, tailored for astronomical tasks. SLON provides a convenient syntax for reductions of observations, choosing of IAU standards to use, applying rules for filtering observations or selecting parameters for fitting. Also, ERA includes a table editor and a graph plotter. ERA-8 has a number of improvements over previous versions such as: integration of the Solar system and TT xA1 TDB with arbitrary number of asteroids; option to use different ephemeris (including DE and INPOP); integrator with 80-bit floating point. The code of ERA-8 has been completely rewritten from Pascal to C (for numerical computations) and Racket (for running SLON programs and managing data). ERA-8 is portable across major operating systems. The format of tables in ERA-8 is based on SQLite. The SPICE format has been chosen as the main format for ephemeris in ERA-8.

  12. Model for reworked deltaic sands - Example from South Lake Arthur, Bayou Gentily, and Bayou Lery Fields

    SciTech Connect

    Saxena, R.S. )

    1990-09-01

    Reworked deltaic sands are beach-barrier sand bodies that are produced by the reworking of abandoned deltaic lobes. The facies association of these sand bodies makes them ideal reservoirs, and although abundant hydrocarbons are trapped in this type of sandstone, their genesis is seldom understood in the petroleum world. Criteria and models are developed for the recognition of reworked deltaic sand bodies from the subsurface by comparing a Holocene analog from the eastern periphery of the modern Mississippi delta with an ancient example from the Carboniferous of the northern Appalachian plateau. A simulated seismic model and several subsurface examples are presented.

  13. Sediment reworking rates in deep sediments of the Mediterranean Sea.

    PubMed

    Barsanti, M; Delbono, I; Schirone, A; Langone, L; Miserocchi, S; Salvi, S; Delfanti, R

    2011-07-01

    Different pelagic areas of the Mediterranean Sea have been investigated in order to quantify physical and biological mixing processes in deep sea sediments. Herein, results of eleven sediment cores sampled at different deep areas (> 2000 m) of the Western and Eastern Mediterranean Sea are presented. ²¹⁰Pb(xs) and ¹³⁷Cs vertical profiles, together with ¹⁴C dating, are used to identify the main processes characterising the different areas and, finally, controlling mixing depths (SML) and bioturbation coefficients (D(b)). Radionuclide vertical profiles and inventories indicate that bioturbation processes are the dominant processes responsible for sediment reworking in deep sea environments. Results show significant differences in sediment mixing depths and bioturbation coefficients among areas of the Mediterranean Sea characterised by different trophic regimes. In particular, in the Oran Rise area, where the Almeria-Oran Front induces frequent phytoplankton blooms, we calculate the highest values of sediment mixing layers (13 cm) and bioturbation coefficients (0.187 cm² yr⁻¹), and the highest values of ²¹⁰Pb(xs) and ¹³⁷Cs inventories. Intermediate values of SML and D(b) (~6 cm and ~0.040 cm² yr⁻¹, respectively) characterise the mesothrophic Algero-Balearic basin, while in the Southern Tyrrhenian Sea mixing parameters (SML of 3 cm and D(b) of 0.011 cm² yr⁻¹ are similar to those calculated for the oligotrophic Eastern Mediterranean (SML of 2 cm and D(b) of ~0.005 cm² yr⁻¹).

  14. Trinity shoal: a reworked deltaic barrier on Louisiana continental shelf

    SciTech Connect

    Suter, J.R.; Penland, S.; Moslow, T.F.

    1985-02-01

    Abandonment and reworking of deltaic complexes of the Holocene Mississippi River have produced a series of sandy shoals on the muddy Louisiana continental shelf. Trinity shoal, one of these transgressive deposits, is located 30 km offshore of Atchafalaya Bay and the Point Au Fer-March Island shell reefs. Approximately 1000 km of high-resolution uniboom and 3.5 kHz subbottom-profile seismic data, taken in this area in 1983 and 1984, provide the data base for this study. Trinity shoal, associated with the abandoned Maringouin delta complex, is a lunate shore-parallel feature approximately 36 km long and 5-10 km wide. Relief on the shoal ranges from 2 to 3 m, and minimum water depths over the shoal vary from -5 to -2 m. The shoal sand body is from 5 to 7 m thick and is composed largely of parallel to low-angle clinoform reflectors. Several levels of buried fluvial channels, ranging in age from early Wisconsinian to Holocene, are associated with the shoal deposit. The occurrence of channel features within the shoal sand itself suggests the presence of tidal inlets, indicating a possible barrier-island origin for the shoal. The underlying deltaic sediments reach approximately 15 m in thickness and are made up of low-angle clinoform reflectors dipping to the southwest. Distributary, bay-fill, estuarine, and buried oyster-reef deposits can be recognized, making these similar to modern Atchafalaya delta deposits. Continued progradation of the Atchafalaya delta will probably result in burial of the Trinity shoal and Maringouin delta deposits by fine-grained sediments, giving these shoal deposits a high-preservation potential and creating an excellent stratigraphic trap.

  15. East Louisiana continental shelf sediments: a product of delta reworking

    USGS Publications Warehouse

    Brooks, Gregg R.; Kingdinger, Jack L.; Penland, Shea; Williams, S. Jeffress

    1995-01-01

    Data from 77 vibracores were integrated with 6,700 line-km of high- resolution seismic reflection profiles collected off the eastern Louisiana coast in the region of the St. Bernard Delta, the first of the Holocene highstand deltas of the Mississippi River. Seismic fades and sediment facies were integrated in order to establish the stratigraphic details within this relict delta. Results provide a regional geologic framework from which comparisons can be made with other areas. Holocene deposits in the study area overlie a heavily dissected surface interpreted to represent a lowstand erosional surface. Resting on this surface is a thin unit of relatively clean, quartz sand interpreted to have been deposited during early transgression. This unit is overlain by sediments of the St. Bernard Delta, a seaward-prograding, coarsening-upward wedge of sands and muds that contain vertically-stacked units of deltaic succession. Two or more prograding units separated by an unconformity, delineated from regional seismic profiles, may represent laterally shifting subdelta lobes. Surficial sediments consist of a thin unit of sands and muds derived from and reflecting the individual subenvirons of the underlying delta. Holocene inner-shelf development off eastern Louisiana has been controlled by relative sea-level rise and sediment supply. Sediment supply and deposition are a product of delta progradation and delta-lobe switching. The modern shelf configuration and surficial sediment distribution patterns reflect reworking of underlying deltaic deposits. The lack of modern sediment input helps to maintain the imprint of this ancient delta on the modern shelf surface.

  16. Reworked palynomorphs and their use in the determination of sedimentary cycles

    NASA Astrophysics Data System (ADS)

    Eshet, Yoram; Druckman, Yehezkeel; Cousminer, Harold L.; Habib, Daniel; Drugg, Warren S.

    1988-07-01

    The Permian-Triassic sequence in the subsurface of Israel was deposited" "near the margin of the Arabian craton, which was a major source for both" "reworked organic and inorganic detritus. Three major depositional cycles" "are identified in this sequence, each consisting of a transgressive interval" "and a regressive interval. Analysis of the stratigraphic variation in the" "amounts of reworked palynomorphs indicates that they are most abundant in" "regressive intervals. This is considered to be a result of changes in the" "extent of exposed land, which was the source for the reworked palynomorphs," "or of changes in the transportational regime. Stratigraphic variation in the" "abundance of reworked organic detritus may be useful for identifying depositional" "cycles that are not otherwise evident in the rock record.

  17. Sediment reworking by a polychaete, Perinereis aibuhitensis, in the intertidal sediments of the Gomso Bay, Korea

    NASA Astrophysics Data System (ADS)

    Koo, Bon Joo; Seo, Jaehwan

    2017-06-01

    Bioturbation, especially sediment reworking by the activities of macroinvertebrates, such as feeding and burrowing, is one of the major processes that affect the physical, chemical, and biological characteristics of marine sediments. Given the importance of sediment reworking, this study was designed to evaluate the sediment reworking rate of a polychaete, Perinereis aibuhitensis, which is dominant in the upper tidal flats on the west coast of Korea, based on quantification of pellet production during spring and fall surveys. The density of individuals was higher in fall than in spring, whereas, due to a difference in the proportion of adults between the two seasons, the morphometric dimensions of the worm and its pellets were significantly longer and heavier in the spring. Hourly pellet production per inhabitant and density were closely related, with pellet production gradually decreasing as density increased. Daily pellet production was much higher in spring than in fall, mostly due to an increase in daytime production. The sediment reworking rate of Perinereis was similar in the two seasons in which observations were made and depended on its density and the sediment reworking rate per individual. The overall sediment reworking rate of Perinereis was 31 mm yr-1 based on its density in the study area.

  18. Semi-Automated Diagnosis, Repair, and Rework of Spacecraft Electronics

    NASA Technical Reports Server (NTRS)

    Struk, Peter M.; Oeftering, Richard C.; Easton, John W.; Anderson, Eric E.

    2008-01-01

    capacity and skill demands from exceeding crew time and training limits, the CLEAR project is examining options provided by non-real time tele-operations, robotics, and a new generation of diagnostic equipment. This paper outlines a strategy to create an effective repair environment where, with the support of ground based engineers, crewmembers can diagnose, repair and test flight electronics in-situ. This paper also discusses the implications of successful tele-robotic repairs when expanded to rework and reconfiguration of used flight assets for building Constellation infrastructure elements.

  19. Life testing of reflowed and reworked advanced CCGA surface mount packages in harsh thermal environments

    NASA Astrophysics Data System (ADS)

    Ramesham, Rajeshuni

    2013-03-01

    Life testing/qualification of reflowed (1st reflow) and reworked (1st reflow, 1st removal, and then 1st rework) advanced ceramic column grid array (CCGA) surface mount interconnect electronic packaging technologies for future flight projects has been studied to enhance the mission assurance of JPL-NASA projects. The reliability of reworked/reflowed surface mount technology (SMT) packages is very important for short-duration and long-duration deep space harsh extreme thermal environmental missions. The life testing of CCGA electronic packages under extreme thermal environments (for example: -185°C to +125°C) has been performed with reference to various JPL/NASA project requirements which encompass the temperature range studied. The test boards of reflowed and reworked CCGA packages (717 Xilinx package, 624, 1152, and 1272 column Actel Packages) were selected for the study to survive three times the total number of expected temperature cycles resulting from all environmental and operational exposures occurring over the life of the flight hardware including all relevant manufacturing, ground operations, and mission phases or cycles to failure to assess the life of the hardware. Qualification/life testing was performed by subjecting test boards to the environmental harsh temperature extremes and assessing any structural failures, mechanical failures or degradation in electrical performance solder-joint failures due to either overstress or thermal cycle fatigue. The large, high density, high input/output (I/O) electronic interconnect SMT packages such as CCGA have increased usage in avionics hardware of NASA projects during the last two decades. The test boards built with CCGA packages are expensive and often require a rework to replace a reflowed, reprogrammed, failed, redesigned, etc., CCGA packages. Theoretically speaking, a good rework process should have similar temperature-time profile as that used for the original manufacturing process of solder reflow. A

  20. Optimization of a Multi–Product Intra-Supply Chain System with Failure in Rework

    PubMed Central

    2016-01-01

    Globalization has created tremendous opportunities, but also made business environment highly competitive and turbulent. To gain competitive advantage, management of present-day transnational firms always seeks options to trim down various transaction and coordination costs, especially in the area of controllable intra-supply chain system. This study investigates a multi–product intra-supply chain system with failure in rework. To achieve maximum machine utilization, multiple products are fabricated in succession on a single machine. During the process, production of some defective items is inevitable. Reworking of nonconforming items is used to reduce the quality cost in production and achieving the goal of lower overall production cost. Because reworks are sometimes unsuccessful, failures in rework are also considered in this study. Finished goods for each product are transported to the sales offices when the entire production lot is quality assured after rework. A multi-delivery policy is used, wherein fixed quantity n installments of the finished lot are transported at fixed intervals during delivery time. The objective is to jointly determine the common production cycle time and the number of deliveries needed to minimize the long–term expected production–inventory–delivery costs for the problem. With the help of a mathematical model along with optimization technique, the optimal production–shipment policy is obtained. We have used a numerical example to demonstrate applicability of the result of our research. PMID:27918588

  1. Production inventory policies for defective items with inspection errors, sales return, imperfect rework process and backorders

    NASA Astrophysics Data System (ADS)

    Jaggi, Chandra K.; Khanna, Aditi; Kishore, Aakanksha

    2016-03-01

    In order to sustain the challenges of maintaining good quality and perfect screening process, rework process becomes a rescue to compensate for the imperfections present in the production system. The proposed model attempts to explore the existing real-life situation with a more practical approach by incorporating the concept of imperfect rework as this occurs as an unavoidable problem to the firm due to irreparable disorders even in the reworked items. Hence, a production inventory model is formulated here to study the combined effect of imperfect quality items, faulty inspection process and imperfect rework process on the optimal production quantity and optimal backorder level. An analytical method is employed to maximize the expected total profit per unit time. Moreover, the results of several previous research articles namely Chiu et al (2006), Chiu et al (2005), Salameh and Hayek (2001), and classical EPQ with shortages are deduced as special cases. To demonstrate the applicability of the model, and to observe the effects of key parameters on the optimal replenishment policy, a numerical example along with a comprehensive sensitivity analysis has been presented. The pertinence of the model can be found in most of the manufacturing industries like textile, electronics, furniture, footwear, plastics etc. A production lot size model has been explored for defectives items with inspection errors and an imperfect rework process.

  2. Optimization of a Multi-Product Intra-Supply Chain System with Failure in Rework.

    PubMed

    Chiu, Singa Wang; Chen, Shin-Wei; Chang, Chih-Kai; Chiu, Yuan-Shyi Peter

    2016-01-01

    Globalization has created tremendous opportunities, but also made business environment highly competitive and turbulent. To gain competitive advantage, management of present-day transnational firms always seeks options to trim down various transaction and coordination costs, especially in the area of controllable intra-supply chain system. This study investigates a multi-product intra-supply chain system with failure in rework. To achieve maximum machine utilization, multiple products are fabricated in succession on a single machine. During the process, production of some defective items is inevitable. Reworking of nonconforming items is used to reduce the quality cost in production and achieving the goal of lower overall production cost. Because reworks are sometimes unsuccessful, failures in rework are also considered in this study. Finished goods for each product are transported to the sales offices when the entire production lot is quality assured after rework. A multi-delivery policy is used, wherein fixed quantity n installments of the finished lot are transported at fixed intervals during delivery time. The objective is to jointly determine the common production cycle time and the number of deliveries needed to minimize the long-term expected production-inventory-delivery costs for the problem. With the help of a mathematical model along with optimization technique, the optimal production-shipment policy is obtained. We have used a numerical example to demonstrate applicability of the result of our research.

  3. Debris flow deposition and reworking by the Colorado River in Grand Canyon, Arizona

    NASA Astrophysics Data System (ADS)

    Yanites, Brian J.; Webb, Robert H.; Griffiths, Peter G.; Magirl, Christopher S.

    2006-11-01

    Flow regulation by large dams affects downstream flow competence and channel maintenance. Debris flows from 740 tributaries in Grand Canyon, Arizona, transport coarse-grained sediment onto debris fans adjacent to the Colorado River. These debris fans constrict the river to form rapids and are reworked during river flows that entrain particles and transport them downstream. Beginning in 1963, flood control operations of Glen Canyon Dam limited the potential for reworking of aggraded debris fans. We analyzed change in debris fans at the mouths of 75-Mile and Monument Creeks using photogrammetry of aerial photography taken from 1965 to 2000 and supplemented with ground surveys performed from 1987 to 2005. Our results quantify the debris fan aggradation that resulted from debris flows from 1984 to 2003. Volume, area, and river constriction increased at both debris fans. Profiles of the two debris fans show that net aggradation occurred in the middle of debris fans at stages above maximum dam releases, and surface shape shifted from concave to convex. Dam releases above power plant capacity partially reworked both debris fans, although reworking removed much less sediment than what was added by debris flow deposition. Large dam releases would be required to create additional reworking to limit the rate of debris fan aggradation in Grand Canyon.

  4. Reworking of Cretaceous dinosaurs into Paleocene channel deposits, upper Hell Creek Formation, Montana

    SciTech Connect

    Lofgren, D.L. ); Hotton, C.L. ); Runkel, A.C. )

    1990-09-01

    Dinosaur teeth from Paleocene channel fills have been interpreted as indicating dinosaur survival into the Paleocene. However, enormous potential for reworking exists because these records are restricted to large channel fills that are deeply incised into Cretaceous strata. Identification of reworked fossils is usually equivocal. This problem is illustrated by the Black Spring Coulee channel fill, a dinosaur-bearing Paleocene deposit in the upper Hell Creek Formation of eastern Montana. In this example, the reworked nature of well-preserved dinosaur bones is apparent only after detailed sedimentological and palynological analysis. Because of the potential for reworking, dinosaur remains derived from Paleocene fluvial deposits should not be assigned a Paleocene age unless the (1) are found in floodplain deposits, (2) are articulated, (3) are in channels that do not incise Cretaceous strata, or (4) are demonstrably reworked from Paleocene deposits. To date, reports of Paleocene dinosaurs do not fulfill any of these criteria. Thus, the proposal that dinosaurs persisted into the Paleocene remains unsubstantiated.

  5. Debris flow deposition and reworking by the Colorado River in Grand Canyon, Arizona

    USGS Publications Warehouse

    Yanites, B.J.; Webb, R.H.; Griffiths, P.G.; Magirl, C.S.

    2006-01-01

    Flow regulation by large dams affects downstream flow competence and channel maintenance. Debris flows from 740 tributaries in Grand Canyon, Arizona, transport coarse-grained sediment onto debris fans adjacent to the Colorado River. These debris fans constrict the river to form rapids and are reworked during river flows that entrain particles and transport them downstream. Beginning in 1963, flood control operations of Glen Canyon Dam limited the potential for reworking of aggraded debris fans. We analyzed change in debris fans at the mouths of 75-Mile and Monument Creeks using photogrammetry of aerial photography taken from 1965 to 2000 and supplemented with ground surveys performed from 1987 to 2005. Our results quantify the debris fan aggradation that resulted from debris flows from 1984 to 2003. Volume, area, and river constriction increased at both debris fans. Profiles of the two debris fans show that net aggradation occurred in the middle of debris fans at stages above maximum dam releases, and surface shape shifted from concave to convex. Dam releases above power plant capacity partially reworked both debris fans, although reworking removed much less sediment than what was added by debris flow deposition. Large dam releases would be required to create additional reworking to limit the rate of debris fan aggradation in Grand Canyon.

  6. Characterizing and Modeling the Cost of Rework in a Library of Reusable Software Components

    NASA Technical Reports Server (NTRS)

    Basili, Victor R.; Condon, Steven E.; ElEmam, Khaled; Hendrick, Robert B.; Melo, Walcelio

    1997-01-01

    In this paper we characterize and model the cost of rework in a Component Factory (CF) organization. A CF is responsible for developing and packaging reusable software components. Data was collected on corrective maintenance activities for the Generalized Support Software reuse asset library located at the Flight Dynamics Division of NASA's GSFC. We then constructed a predictive model of the cost of rework using the C4.5 system for generating a logical classification model. The predictor variables for the model are measures of internal software product attributes. The model demonstrates good prediction accuracy, and can be used by managers to allocate resources for corrective maintenance activities. Furthermore, we used the model to generate proscriptive coding guidelines to improve programming, practices so that the cost of rework can be reduced in the future. The general approach we have used is applicable to other environments.

  7. A family of reworkable polymer networks by the incorporation of sterically hindered urea linkages

    NASA Astrophysics Data System (ADS)

    Malik, Jitendra

    2002-01-01

    Crosslinked polymer networks are excellent materials for multiple applications. However, while their crosslinked structure gives the networks many positive attributes, it also makes them essentially intractable after the covalent crosslinks are formed. Therefore, it is exceedingly difficult to reprocess polymer networks once crosslinked without exposure to extreme degradation conditions. The first part of this work focuses in creating crosslinked networks that could show controlled disassembly upon stimulus. It was found that a controlled network disassembly process could be invoked by the incorporation of sterically hindered urea linkages into the polymer network. This network was shown to disassemble upon exposure to heat, whereas in the absence of heat, the network was found to maintain its crosslinked structure. The disassembly temperature could be varied by careful selection of the cleaving agent based on controllable considerations. This work focuses on showing controlled network disassembly of a crosslinked polymer matrix. Herein, we describe the factors that control the disassembly temperature and conclude with a possible mechanism for the disassembly process based on experimental data. Once disassembly could be shown to occur using sterically hindered urea linkages, polymer molecules were incorporated directly into the reworkable network. The presence of the polymer was found to significantly effect the reworkable behavior and these effects were detailed and an explanation for the behavior was provided. The work then focused on the effects of sterics along the length of the reworkable crosslinker. It was found that sterics along the length of the chain did have an effect. Specifically, as the steric hindrance increased around the urea linkage the rework temperature was found to decrease. Our focus then shifted to study the effects of changing the number of reworkable linkages per crosslinker. As the number per crosslinker changed from two to one the

  8. Characterizing and Modeling the Cost of Rework in a Library of Reusable Software Components

    NASA Technical Reports Server (NTRS)

    Basili, Victor R.; Condon, Steven E.; ElEmam, Khaled; Hendrick, Robert B.; Melo, Walcelio

    1997-01-01

    In this paper we characterize and model the cost of rework in a Component Factory (CF) organization. A CF is responsible for developing and packaging reusable software components. Data was collected on corrective maintenance activities for the Generalized Support Software reuse asset library located at the Flight Dynamics Division of NASA's GSFC. We then constructed a predictive model of the cost of rework using the C4.5 system for generating a logical classification model. The predictor variables for the model are measures of internal software product attributes. The model demonstrates good prediction accuracy, and can be used by managers to allocate resources for corrective maintenance activities. Furthermore, we used the model to generate proscriptive coding guidelines to improve programming, practices so that the cost of rework can be reduced in the future. The general approach we have used is applicable to other environments.

  9. The optimal manufacturing batch size with rework under time-varying demand process for a finite time horizon

    NASA Astrophysics Data System (ADS)

    Musa, Sarah; Supadi, Siti Suzlin; Omar, Mohd

    2014-07-01

    Rework is one of the solutions to some of the main issues in reverse logistic and green supply chain as it reduces production cost and environmental problem. Many researchers focus on developing rework model, but to the knowledge of the author, none of them has developed a model for time-varying demand rate. In this paper, we extend previous works and develop multiple batch production system for time-varying demand rate with rework. In this model, the rework is done within the same production cycle.

  10. 30 CFR 556.70 - Extension of lease by drilling or well reworking operations.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 30 Mineral Resources 2 2013-07-01 2013-07-01 false Extension of lease by drilling or well reworking operations. 556.70 Section 556.70 Mineral Resources BUREAU OF OCEAN ENERGY MANAGEMENT, DEPARTMENT OF THE INTERIOR OFFSHORE LEASING OF SULPHUR OR OIL AND GAS IN THE OUTER CONTINENTAL SHELF...

  11. 30 CFR 556.70 - Extension of lease by drilling or well reworking operations.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 30 Mineral Resources 2 2012-07-01 2012-07-01 false Extension of lease by drilling or well reworking operations. 556.70 Section 556.70 Mineral Resources BUREAU OF OCEAN ENERGY MANAGEMENT, DEPARTMENT OF THE INTERIOR OFFSHORE LEASING OF SULPHUR OR OIL AND GAS IN THE OUTER CONTINENTAL SHELF...

  12. 30 CFR 556.70 - Extension of lease by drilling or well reworking operations.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 30 Mineral Resources 2 2014-07-01 2014-07-01 false Extension of lease by drilling or well reworking operations. 556.70 Section 556.70 Mineral Resources BUREAU OF OCEAN ENERGY MANAGEMENT, DEPARTMENT OF THE INTERIOR OFFSHORE LEASING OF SULPHUR OR OIL AND GAS IN THE OUTER CONTINENTAL SHELF...

  13. 30 CFR 256.70 - Extension of lease by drilling or well reworking operations.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 30 Mineral Resources 2 2011-07-01 2011-07-01 false Extension of lease by drilling or well reworking operations. 256.70 Section 256.70 Mineral Resources BUREAU OF OCEAN ENERGY MANAGEMENT, REGULATION, AND ENFORCEMENT, DEPARTMENT OF THE INTERIOR OFFSHORE LEASING OF SULPHUR OR OIL AND GAS IN THE...

  14. Evidence of reworked Cretaceous fossils and their bearing on the existence of Tertiary dinosaurs

    SciTech Connect

    Eaton, J.G. ); Kirkland, J.I. ); Doi, K. )

    1989-06-01

    The Paleocene Shotgun fauna of Wyoming includes marine sharks as well as mammals. It has been suggested that the sharks were introduced from the Cannonball Sea. It is more likely that these sharks were reworked from a Cretaceous rock sequence that included both marine and terrestrial deposits as there is a mixture of marine and freshwater taxa. These taxa have not been recorded elsewhere after the Cretaceous and are not known from the Cannonball Formation. Early Eocene localities at Raven Ridge, Utah, similarly contain teeth of Cretaceous marine and freshwater fish, dinosaurs, and Eocene mammals. The Cretaceous teeth are well preserved, variably abraded, and serve to cast doubts on criteria recently used to claim that dinosaur teeth recovered from the Paleocene of Montana are not reworked. Another Eocene locality in the San Juan Basin has produced an Eocene mammalian fauna with diverse Cretaceous marine sharks. Neither the nature of preservation nor the degree of abrasion could be used to distinguish reworked from contemporaneous material. The mixed environments represented by the fish taxa and recognition of the extensive pre-Tertiary extinction of both marine and freshwater fish were employed to recognize reworked specimens.

  15. 30 CFR 256.70 - Extension of lease by drilling or well reworking operations.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ..., DEPARTMENT OF THE INTERIOR OFFSHORE LEASING OF SULPHUR OR OIL AND GAS IN THE OUTER CONTINENTAL SHELF Assignments, Transfers, and Extensions § 256.70 Extension of lease by drilling or well reworking operations... 30 Mineral Resources 2 2012-07-01 2012-07-01 false Extension of lease by drilling or...

  16. 30 CFR 256.70 - Extension of lease by drilling or well reworking operations.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ..., DEPARTMENT OF THE INTERIOR OFFSHORE LEASING OF SULPHUR OR OIL AND GAS IN THE OUTER CONTINENTAL SHELF Assignments, Transfers, and Extensions § 256.70 Extension of lease by drilling or well reworking operations... 30 Mineral Resources 2 2013-07-01 2013-07-01 false Extension of lease by drilling or...

  17. 30 CFR 256.70 - Extension of lease by drilling or well reworking operations.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ..., DEPARTMENT OF THE INTERIOR OFFSHORE LEASING OF SULPHUR OR OIL AND GAS IN THE OUTER CONTINENTAL SHELF Assignments, Transfers, and Extensions § 256.70 Extension of lease by drilling or well reworking operations... 30 Mineral Resources 2 2014-07-01 2014-07-01 false Extension of lease by drilling or...

  18. 30 CFR 256.70 - Extension of lease by drilling or well reworking operations.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... INTERIOR OFFSHORE LEASING OF SULPHUR OR OIL AND GAS IN THE OUTER CONTINENTAL SHELF Assignments, Transfers, and Extensions § 256.70 Extension of lease by drilling or well reworking operations. The term of a... 30 Mineral Resources 2 2010-07-01 2010-07-01 false Extension of lease by drilling or...

  19. The role of radiogenic heat in prolonged intraplate reworking: The Capricorn Orogen explained?

    NASA Astrophysics Data System (ADS)

    Korhonen, Fawna J.; Johnson, Simon P.

    2015-10-01

    Links between intraplate crustal deformation and the thermal regime of the lithosphere have been investigated using numerical models, but these conceptual models must be tested using well-constrained natural systems. The Proterozoic Capricorn Orogen of Western Australia is ideally suited for such a study; after arc accretion, it records a protracted history of intracrustal differentiation and over one billion years of subsequent tectonic reworking. The early addition of juvenile arc material initially reduced the heat production of the crust, whereas subsequent recycling of the deep crust ultimately produced radiogenic granites in the shallow crust. Using whole rock and magmatic zircon compositions, we show that the shallow crust of the Capricorn Orogen has been progressively enriched in heat-producing elements with time. The high heat production is mainly controlled by thorium, concentrated in LREE-enriched phosphates that grew during the late stages of crystallization of crustally-derived granites. Using a numerical model, we investigate the thermal effects of this evolved crustal stratification and compare them with quantitative data on the pressure-temperature-time evolution of a non-magmatic Mesoproterozoic reworking event. The results provide new information concerning the process by which the thermal conditions necessary for the reworking of orogenic crust are generated and sustained for prolonged timescales (>110 Ma). Furthermore, we demonstrate that perturbations to the radiogenic crust lead to warmer geotherms and consequent lithospheric weakening, which has a fundamental control on intraplate reworking of long-lived orogens.

  20. Reworked Coursework: A Study of the Effect of Offering an Academic Second Chance.

    ERIC Educational Resources Information Center

    Cowan, John

    1980-01-01

    Undergraduate engineering students were required to write research papers and present them to the class, which would prepare appraisals and discuss the work. The original authors would then rework their papers. An analysis of this approach is presented and indicates that it is a useful educational strategy. (Author/JMD)

  1. Model Specification for Rework of Aircraft Engine, Power Transmission, and Accessory/Auxiliary Ball and Roller Bearings

    NASA Technical Reports Server (NTRS)

    Zaretsky, Erwin V.; Branzai, Emanuel V.

    2007-01-01

    This document provides a model specification for the rework and/or repair of bearings used in aircraft engines, helicopter main power train transmissions, and auxiliary bearings determined to be critical by virtue of performance, function, or availability. The rolling-element bearings to be processed under the provisions of this model specification may be used bearings removed after service, unused bearings returned from the field, or certain rejected bearings returned for reinspection and salvage. In commercial and military aircraft application, it has been a practice that rolling-element bearings removed at maintenance or overhaul be reworked and returned to service. Depending on the extent of rework and based upon theoretical analysis, representative life factors (LF) for bearings subject to rework ranged from 0.87 to 0.99 the lives of new bearings. Based on bearing endurance data, 92 percent of the bearing sets that would be subject to rework would result in L(sub 10) lives equaling and/or exceeding that predicted for new bearings. The remaining 8 percent of the bearings have the potential to achieve the analytically predicted life of new bearings when one of the rings is replaced at rework. The potential savings from bearing rework varies from 53 to 82 percent of that of new bearings depending on the cost, size, and complexity of the bearing

  2. Architectural Dependency Analysis to Understand Rework Costs for Safety Critical Systems

    DTIC Science & Technology

    2014-06-07

    Architectural Dependency Analysis to Understand Rework Costs for Safety-Critical Systems Robert L. Nord , Ipek Ozkaya Software Engineering...generalized from observing the evolution of safety-critical systems. Section 4 revisits the architecture using knowledge of behavior and design...assumptions.  Resource behavior (R): For B to execute correctly, the resource behavior of A must be consistent with B’s assumptions about resource

  3. Erosion and reworking of Pacific sediments near the Eocene-Oligocene boundary

    NASA Astrophysics Data System (ADS)

    Moore, Ted C.

    2013-06-01

    The Eocene-Oligocene (E/O) boundary interval marks one of the largest and most rapid changes in climate during the last 50 Myr. Because of a very shallow calcium carbonate compensation depth in the Eocene, as well as the reworking of sediments and hiatuses in the boundary zone, it has also been one of the most difficult stratigraphic boundaries to study in deep water marine sections, especially in the Pacific Ocean. Recently, three drill sites have recovered complete sections of the E/O boundary interval in the tropical Pacific. A detailed study of these sections shows a series of pulses of reworked older radiolarians in the upper Eocene and lowermost Oligocene. The two largest pulses are coincident with the two sharp steps in carbon and oxygen isotope values that bracket the E/O boundary. Several smaller peaks in reworked material precede these two maxima. It is proposed that immixing of the older radiolarian species results from erosion and redeposition, possibly linked to pulses of new bottom water formation and the formation of a deep pycnocline.

  4. Storm-reworked shallow-marine fans in the Middle Triassic Baise area, South China

    NASA Astrophysics Data System (ADS)

    Wang, Jiahao; Xie, Xinong; Pang, Xiong; Liu, Baojun

    2017-03-01

    Shallow-marine fans have been analyzed for sedimentary characteristics and genetic mechanisms far less commonly than deep-marine fans. Based on outcrop observations, this study reveals that large-scale submarine fans in the Middle Triassic Baise area, south China, consisted of a braided channel-levee facies complex in the inner fans; sinuous channel-levee facies complex, overbank facies and crevasse splay facies in the medial fans; and sand sheet facies in the outer fans, which present different lithology assemblages and depositional successions. The lithofacies of dominant massive sandstone, secondary graded sandstone and laminated sandstone from bottom to top is similar to the Bouma sequence, indicative of gravity flow processes. However, the laminated sandstones mostly bear sedimentary structures of gutter casts, wave-generated ripple marks, hummocky cross-bedding, wave-generated cross-bedding and ripple bedding, and were thus attributed to frequent storm reworking processes. Moreover, discontinuous deposition recorded by abrupt sediment grain-size changes, distinct interfaces and divergent paleocurrent orientations occurred between the laminated sandstones and the underlying massive (or graded) sandstones. Accordingly, storm reworking processes together with abundant fossils of Daonella, Ammonite and Crinoidea indicate a shallow-marine paleo-environment. As a whole, this study provides a good example of large-scale shallow-marine fans and laminated sandstones resulted from storm reworking.

  5. Coral-rubble ridges as dynamic coastal features - short-term reworking and weathering processes

    NASA Astrophysics Data System (ADS)

    Spiske, Michaela

    2016-02-01

    A coral-rubble ridge built by storm waves at Anegada (British Virgin Islands) underwent remarkable changes in shape and weathering in a 23-month period. The ridge is located along the island's north shore, in the lee of a fringing reef and a reef flat. This coarse-clast ridge showed two major changes between March 2013, when first examined, and February 2015, when revisited. First, a trench dug in 2013, and intentionally left open for further examination, was found almost completely infilled in 2015, and the ridge morphology was modified by slumping of clasts down the slope and by reworking attributable to minor storm waves. In size, composition and overall condition, most of the clasts that filled the trench resemble reworked clasts from the ridge itself; only a small portion had been newly brought ashore. Second, a dark gray patina formed on the whitish exteriors of the carbonate clasts that had been excavated in 2013. These biologically weathered, darkened clasts had become indistinguishable from clasts that had been at the ridge surface for a much longer time. The findings have two broader implications. First, coastal coarse-clast ridges respond not solely to major storms, but also to tropical storms or minor hurricanes. The modification and reworking of the ridge on Anegada most probably resulted from hurricane Gonzalo which was at category 1-2 as it passed about 60 km north of the island in October 2014. Second, staining of calcareous clasts by cyanobacteria in the supralittoral zone occurs within a few months. In this setting, the degree of darkening quickly saturates as a measure of exposure age.

  6. Benthic macrofauna and sediment reworking quantification in contrasted environments in the Thau Lagoon

    NASA Astrophysics Data System (ADS)

    Duport, E.; Gilbert, F.; Poggiale, J.-C.; Dedieu, K.; Rabouille, C.; Stora, G.

    2007-04-01

    As part of the Microbent-PNEC Program: "Biogeochemical processes at the water-sediment interface in eutrophicated environment", the aim of this work was to specifically investigate and quantify the relationships between macrobenthos and sediment reworking in the Thau Lagoon in order to provide information on the potential contaminant distribution and movements at the water-sediment interface. In order to achieve this, three cores were sampled at two stations (in the central part of the Thau Lagoon and near the shellfish farming zone) in the Thau Lagoon, in December 2001, April 2002, August 2002, January 2003 and May 2003. On the basis of quantification of macrobenthos and sediment reworking, evidence is provided of: (1) similar sediment mixing intensities for different species composition at the two stations; (2) the major role of functional bioturbation groups (e.g., biodiffusors and gallery-diffusors) modulated by seasonal variability on sediment mixing; (3) an increase of intensity in summer suggesting potentially different patterns of redistribution, bioaccumulation and chemical fate (e.g., speciation) of deposited contaminants.

  7. Sand wave fields beneath the Loop Current, Gulf of Mexico: Reworking of fan sands

    USGS Publications Warehouse

    Kenyon, Neil H.; Akhmetzhanov, A.M.; Twichell, D.C.

    2002-01-01

    Extensive fields of large barchan-like sand waves and longitudinal sand ribbons have been mapped by deep-towed SeaMARC IA sidescan sonar on part of the middle and lower Mississippi Fan that lies in about 3200 m of water. The area is beneath the strongly flowing Loop Current. The bedforms have not been adequately sampled but probably consist of winnowed siliciclastic-foraminiferal sands. The size (about 200 m from wingtip to wingtip) and shape of the large barchans is consistent with a previously observed peak current speed of 30 cm/s, measured 25 m above the seabed. The types of small-scale bedforms and the scoured surfaces of chemical crusts, seen on nearby bottom photographs, indicate that near-bed currents in excess of 30 cm/s may sometimes occur. At the time of the survey the sand transport direction was to the northwest, in the opposite direction to the Loop Current but consistent with there being a deep boundary current along the foot of the Florida Escarpment. Some reworking of the underlying sandy turbidites and debris flow deposits is apparent on the sidescan sonar records. Reworking by deep-sea currents, resulting in erosion and in deposits characterised by coarsening upwards structures and cross-bedding, is a process that has been proposed for sand found in cores in shallower parts of the Gulf of Mexico. This process is more widespread than hitherto supposed. 

  8. Mathematical modeling of a multi-product EMQ model with an enhanced end items issuing policy and failures in rework.

    PubMed

    Chiu, Yuan-Shyi Peter; Sung, Peng-Cheng; Chiu, Singa Wang; Chou, Chung-Li

    2015-01-01

    This study uses mathematical modeling to examine a multi-product economic manufacturing quantity (EMQ) model with an enhanced end items issuing policy and rework failures. We assume that a multi-product EMQ model randomly generates nonconforming items. All of the defective are reworked, but a certain portion fails and becomes scraps. When rework process ends and the entire lot of each product is quality assured, a cost reduction n + 1 end items issuing policy is used to transport finished items of each product. As a result, a closed-form optimal production cycle time is obtained. A numerical example demonstrates the practical usage of our result and confirms a significant savings in stock holding and overall production costs as compared to that of a prior work (Chiu et al. in J Sci Ind Res India, 72:435-440 2013) in the literature.

  9. Viable School Improvement Requires a Developmental Strategy that Moves beyond the Skewed Wish List and Reworks Operational Infrastructure. A Center Brief

    ERIC Educational Resources Information Center

    Center for Mental Health in Schools at UCLA, 2011

    2011-01-01

    factors affecting learning and teaching and how the operational infrastructure is reworked to enable strategic and effective development of essential interventions. This is especially so for schools that…

  10. Middle Miocene reworked turbidites in the Baiyun Sag of the Pearl River Mouth Basin, northern South China Sea margin: Processes, genesis, and implications

    NASA Astrophysics Data System (ADS)

    Gong, Chenglin; Wang, Yingmin; Zheng, Rongcai; Hernández-Molina, F. Javier; Li, Yun; Stow, Dorrik; Xu, Qiang; Brackenridge, Rachel E.

    2016-10-01

    Our understanding of reworked turbidites is still in its infancy, and their flow processes and genesis still remain understudied. Core data from the middle Miocene Zhujiang Formation in the Pearl River Mouth Basin allow us to differentiate reworked turbidites, yielding two main contributions. Firstly, reworked turbidites are distinguished from turbidites by the association of traction structures and tidal signatures, which occur in discrete units rather than forming a classic "Bouma Sequence" for turbidites. Sedimentological characteristics of reworked turbidites proposed here will help to obtain a robust set of diagnostic criteria for the recognition of deep-water non-turbidite deepwater units as reservoirs. Secondly, our results suggest that, in the down-slope direction, classic detritus carried in turbidity flows would synchronously be bidirectionally reworked by internal tides and waves, resulting in tidal signatures seen in the interpreted reworked turbidites. In the along-slope direction, upper parts of dilute turbidity currents would mix vertically with seawater, and muddy fines would be winnowed away by contour currents, whereas lower parts of dilute turbidity currents would probably drop their coarse particles, resulting in traction structures recognized in the documented reworked turbidites. Our work highlights the influence of bottom currents on the development and modification of turbidites and suggests that reworked turbidites were created by the combined action of down-slope transport and reworking and along-slope winnowing and sorting, helping to better understand flow processes and genesis of non-turbidite reservoirs with a great economic interest.

  11. Debris-flow dominance of alluvial fans masked by runoff reworking and weathering

    NASA Astrophysics Data System (ADS)

    de Haas, Tjalling; Ventra, Dario; Carbonneau, Patrice E.; Kleinhans, Maarten G.

    2014-07-01

    Arid alluvial fan aggradation is highly episodic and fans often comprise active and inactive sectors. Hence the morphology and texture of fan surfaces are partly determined by secondary processes of weathering and erosion in addition to primary processes of aggradation. This introduces considerable uncertainty in the identification of formative processes of terrestrial and Martian fans from aerial and satellite imagery. The objectives of this study are (i) to develop a model to describe the sedimentological and morphological evolution of inactive fan surfaces in arid settings, and (ii) to assess the relative importance of primary processes of aggradation and secondary processes of weathering and reworking for surface morphology and sedimentology and for the stratigraphic record. We studied an alluvial fan characterized by a recently active sector and a long-abandoned, inactive sector along the coast of the hyperarid Atacama Desert. Here, rates of primary geomorphic activity are exceptionally low because of extreme aridity, while weathering rates are relatively high because of the effects of coastal fogs. Long-term processes of fan aggradation and reworking were determined through sedimentological facies analysis of stratigraphic sections. Ground surveys for textural and morphological patterns at the fan surface were integrated with remote-sensing by an Unmanned Airborne Vehicle (UAV). Discharges and sediment-transport capacities were calculated to estimate the efficiency of secondary runoff in reshaping the inactive fan sector. Stratigraphic sections reveal that the fan was dominantly aggraded by debris flows, whereas surface morphology is dominated by debris-flow signatures in the active sector and by weathering and runoff on the inactive sector. On the latter, rapid particle breakdown prevents the formation of a coarse desert pavement. Furthermore, relatively frequent local runoff events erode proximal debris-flow channels on the inactive sector to form local lag

  12. Reworking of muddy intertidal sediments in the severn estuary, Southwestern U.K.—A preliminary survey

    NASA Astrophysics Data System (ADS)

    Allen, J. R. L.

    1987-03-01

    The estuary is a large, macrotidal system that faces the prevailing winds. Consequently, it is swept by vigorous tidal currents and is somewhat stormy. The muddy intertidal sediments, ranging in age from the early Flandrian to the present day, are predisposed to reworking chiefly because of (a) the presence of silt and sand laminae, which promotes splitting along the bedding, and (b) the development during the spring and summer of deep, ramifying drying cracks in response to seasonal changes in the tidal and weather regimes. The chief mechanisms and processes of reworking are various kinds of mass movement after failure, wave impact and current shear, and scouring by water-born tools. The chief expressions of reworking are: (1) mud cliffs associated with either an apron or strew of fallen masses of sediment; (2) rip-up clasts; (3) extensive scoured surfaces; (4) ridges and furrows of various scales parallel with tidal currents; (5) ridges and furrows at right-angles to shore shaped by incident waves; and (6) sediment sheets and trains of bedforms composed of either mud clasts (granule- to pebble-sized) or siderite-clay mineral concretions (sand- to granule-sized). Reworking in the estuary occurs on tidal, seasonal and longer time scales. Since the mid Flandrian, when peats with mature trees accumulated throughout the area, the Severn Estuary has retreated up the Severn Vale, the muddy sediments being extensively reworked in the process. During this retreat, the minimum annual turnover of fine sediment through reworking may have amounted to between 7 and 70% of the annual fluvial supply.

  13. Crustal reworking at Nanga Parbat, Pakistan: Metamorphic consequences of thermal-mechanical coupling facilitated by erosion

    NASA Astrophysics Data System (ADS)

    Zeitler, Peter K.; Koons, Peter O.; Bishop, Michael P.; Chamberlain, C. Page; Craw, David; Edwards, Michael A.; Hamidullah, Syed; Jan, M. Qasim; Khan, M. Asif; Khattak, M. Umar Khan; Kidd, William S. F.; Mackie, Randall L.; Meltzer, Anne S.; Park, Stephen K.; Pecher, Arnaud; Poage, Michael A.; Sarker, Golam; Schneider, David A.; Seeber, Leonardo; Shroder, John F.

    2001-10-01

    Within the syntaxial bends of the India-Asia collision the Himalaya terminate abruptly in a pair of metamorphic massifs. Nanga Parbat in the west and Namche Barwa in the east are actively deforming antiformal domes which expose Quaternary metamorphic rocks and granites. The massifs are transected by major Himalayan rivers (Indus and Tsangpo) and are loci of deep and rapid exhumation. On the basis of velocity and attenuation tomography and microseismic, magnetotelluric, geochronological, petrological, structural, and geomorphic data we have collected at Nanga Parbat we propose a model in which this intense metamorphic and structural reworking of crustal lithosphere is a consequence of strain focusing caused by significant erosion within deep gorges cut by the Indus and Tsangpo as these rivers turn sharply toward the foreland and exit their host syntaxes. The localization of this phenomenon at the terminations of the Himalayan arc owes its origin to both regional and local feedbacks between erosion and tectonics.

  14. An EMQ inventory model for defective products involving rework and sales team's initiatives-dependent demand

    NASA Astrophysics Data System (ADS)

    Priyan, S.; Uthayakumar, R.

    2015-07-01

    This paper investigates the issue of an economic manufacturing quantity model for defective products involving imperfect production processes and rework. We consider that the demand is sensitive to promotional efforts/sales teams' initiatives as well as the setup cost can be reduced through further investment. It also assumes that fixed quantity multiple installments of the finished batch are delivered to customers at a fixed interval of time. The long-run average cost function is derived and its convexity is proved via differential calculus. An effective iterative solution procedure is developed to achieve optimal replenishment lot-size, setup cost and the initiatives of sales teams so that the total cost of system is minimized. Numerical and sensitivity analyses are performed to evaluate the outcome of the proposed solution procedure presented in this research.

  15. The connection between crustal reworking and petrological diversity in the deep crust: clues from migmatites

    NASA Astrophysics Data System (ADS)

    Carvalho, Bruna B.; Sawyer, Edward W.; de Assis Janasi, Valdecir

    2016-04-01

    The deep levels of the continental crust have been extensively reworked as result of crustal differentiation. Migmatites are widespread in these high-grade metamorphic terrains, and provide valuable information on how processes such as partial melting, segregation of the melt from the residue and subsequent chemical exchanges lead to the petrological diversity found in the deep crust. This study investigates processes that transformed a largely uniform, metagranodiorite protolith into a very complex migmatite that contains three varieties of diatexites (grey, schlieren and homogenous diatexites) and several types of leucosomes. The Kinawa Migmatite is part of the Archean TTG crust in the São Francisco Craton (Brazil), which has been reworked in a shear zone environment at upper amphibolite facies conditions (<730°C and 5-6 kbar); thus it may be typical of crustal reworking in the interior of old cratons [1]. Grey diatexites are residual rocks formed by the extraction of a water-fluxed melt created via the reaction Pl + Kfs + Qz + H2O = melt. Diversity within the grey diatexites arises from different degrees of melt segregation (maximum ~40% melt). Schlieren diatexites are very heterogeneous rocks in which residuum-rich domains alternate with leucocratic quartzo-feldspathic domains where melt accumulated. Homogeneous diatexites are coarse-grained leucocratic rocks and represent larger bodies of anatectic melt with minor amounts (<20%) of entrained residuum. Leucosomes display a wide range of compositions from tonalitic to alkali-feldspar granite. Leucosomes, homogeneous diatexites and the quartzo-feldspathic domains in the schlieren diatexites all show a sequence of microstructural stages from plagioclase-dominated to K-feldspar-dominated frameworks many of which show evidence for tectonic compaction. Thus, further segregation of melt from solids occurred during crystallization. Minor amphibolite dykes in the metagranodiorite did not melt. They occur as angular to

  16. Drill site geohazard identification facilitated by rework of suitable existing 3D seismic data volumes

    SciTech Connect

    Cowlard, A.P.

    1996-12-31

    3D seismic volumes are increasingly being used to assist in the mapping and identification of drilling hazards. A method of reworking the 3D volume, termed the Short Offset method, is proposed which offers the benefit of optimized resolution in the shallow section and therefore provides the interpreter with an enhanced image of the near surface geology. The processing sequence contrasts markedly with conventional 3D processing and involves the inclusion of only near normal incidence traces. Two case histories are described which illustrate the application of the Short Offset method and its robustness even in conditions not conducive to enhancing frequency bandwidth. In summary, Short Offset reprocessing results in a product which offers considerably improved resolution when compared to a conventional 3D volume and far finer areal sampling when compared to a traditional 2D site survey thus providing the industry with a valuable tool for drilling hazard investigation.

  17. Maximising profits for an EPQ model with unreliable machine and rework of random defective items

    NASA Astrophysics Data System (ADS)

    Pal, Brojeswar; Sankar Sana, Shib; Chaudhuri, Kripasindhu

    2013-03-01

    This article deals with an economic production quantity (EPQ) model in an imperfect production system. The production system may undergo in 'out-of-control' state from 'in-control' state, after a certain time that follows a probability density function. The density function varies with reliability of the machinery system that may be controlled by new technologies, investing more costs. The defective items produced in 'out-of-control' state are reworked at a cost just after the regular production time. Occurrence of the 'out-of-control' state during or after regular production-run time is analysed and also graphically illustrated separately. Finally, an expected profit function regarding the inventory cost, unit production cost and selling price is maximised analytically. Sensitivity analysis of the model with respect to key parameters of the system is carried out. Two numerical examples are considered to test the model and one of them is illustrated graphically.

  18. [Support for Adult ASD in Medical Rework Program: Mutual Communication Program and Psychodrama].

    PubMed

    Yokoyama, Motonori

    2015-01-01

    While carrying out the Medical Rework Program, we realized the necessity for a supplementary medical treatment program aimed at adult ASD. Consequently, we started the Mutual Communication Program, which consists of standard SST and the new element of psychodrama. As a result, 32 participants have returned to their workplace in the three-year period, and the rate of successfully continuing to work was 93.8% at the time of the investigation. Various psychological tests also indicated significant improvement. In this article, we present a case study, explain psychodrama techniques employed in the program, and discuss their usefulness. The results suggest that psychodrama is a very effective assistive technique when the characteristics of ASD are taken into consideration.

  19. Carbonate dissolution in nearshore terrigenous muds: the role of physical and biological reworking

    SciTech Connect

    Aller, R.C.

    1982-01-01

    Because shallow marine sediments generally underlie waters which are saturated with respect to aragonite and calcite, physical-chemical dissolution of carbonate in these environments is sometimes discounted. The present investigation, shows such an assumption to be unwarranted. In this case, study of terrigenous mud deposits for Long Island Sound, USA demonstrates extensive dissolution of molluscan shell debris near the sediment-water interface. Net buildup of carbonate varies significantly between different regions of the Sound despite fairly uniform production of shell debris and similar total sedimentation rates. Aside from this apparent discrepancy between rate of supply and net carbonate sedimentation, evidence for carbonate dissolution comes from the pitting of shells, elevated Ca/sup + +/ levels in pore water, and calculated undersaturation of pore waters with respect to carbonate minerals. Maximum shell preservation occurs in regions where physical disturbances cause poorly developed bottom communities, while only minimal preservation occurs where benthic communities are best developed and biogenic reworking is greatest.

  20. Migrant labor takes a holiday. Reworking modernity and marginality in contemporary Thailand.

    PubMed

    Mills, M B

    1999-03-01

    This paper examines the practice of working-class group excursions in Thailand, organized by and for rural labor migrants in Bangkok. These trips involve traditional forms of Buddhist ceremonial as well as more self-consciously "modern" sightseeing activities in distant regions of the country. More than just a welcome respite from the drudgery and discipline of factory jobs, these excursions allow labor migrants to make important claims about their experiences as members of the Thai nation-state. As tourist-consumers, migrant workers appropriate powerful signs and symbols of modern Thai identity and status, in doing so they contest (and at least partly rework) their material and ideological marginalization within contemporary Thai society.

  1. Economic production quantity model for items with continuous quality characteristic, rework and reject

    NASA Astrophysics Data System (ADS)

    Tsou, Jia-Chi; Hejazi, Seyed Reza; Rasti Barzoki, Morteza

    2012-12-01

    The economic production quantity (EPQ) model is a well-known and commonly used inventory control technique. However, the model is built on an unrealistic assumption that all the produced items need to be of perfect quality. Having relaxed this assumption, some researchers have studied the effects of the imperfect products on the inventory control techniques. This article, thus, attempts to develop an EPQ model with continuous quality characteristic and rework. To this end, this study assumes that a produced item follows a general distribution pattern, with its quality being perfect, imperfect or defective. The analysis of the model developed indicates that there is an optimal lot size, which generates minimum total cost. Moreover, the results show that the optimal lot size of the model equals that of the classical EPQ model in case imperfect quality percentage is zero or even close to zero.

  2. New residence times of the Holocene reworked shells on the west coast of Bohai Bay, China

    NASA Astrophysics Data System (ADS)

    Shang, Zhiwen; Wang, Fu; Li, Jianfen; Marshall, William A.; Chen, Yongsheng; Jiang, Xingyu; Tian, Lizhu; Wang, Hong

    2016-01-01

    Shelly cheniers and shell-rich beds found intercalated in near-shore marine muds and sandy sediments can be used to indicate the location of ancient shorelines, and help to estimate the height of sea level. However, dating the deposition of material within cheniers and shell-rich beds is not straightforward because much of this material is transported and re-worked, creating an unknown temporal off-set, i.e., the residence time, between the death of a shell and its subsequent entombment. To quantify the residence time during the Holocene on a section of the northern Chinese coastline a total 47 shelly subsamples were taken from 17 discrete layers identified on the west coast of Bohai Bay. This material was AMS 14C dated and the calibrated ages were systematically compared. The subsamples were categorized by type as articulated and disarticulated bivalves, gastropod shells, and undifferentiated shell-hash. It was found that within most individual layers the calibrated ages of the subsamples got younger relative to the amount of apparent post-mortem re-working the material had been subject to. For examples, the 14C ages of the bivalve samples trended younger in this order: shell-hash → split shells → articulated shells. We propose that the younger subsample age determined within an individual layer will be the closest to the actual depositional age of the material dated. Using this approach at four Holocene sites we find residence times which range from 100 to 1260 cal yrs, with two average values of 600 cal yrs for the original 14C dates older than 1 ka cal BP and 100 cal yrs for the original 14C dates younger than 1 ka cal BP, respectively. Using this semi-empirical estimation of the shell residence times we have refined the existing chronology of the Holocene chenier ridges on the west coast of Bohai Bay.

  3. Evaluating the Effects of Sediment Reworking on the Sulfur Isotopic Composition of Aqueous and Mineral Sulfides

    NASA Astrophysics Data System (ADS)

    Johnson, D.; Rose, C.; Fike, D. A.

    2014-12-01

    The sulfur isotopic compositions of sulfide minerals preserved in the rock record are widely used in reconstructions of past ocean and atmospheric chemistry, but little is known about how syn- and post-depositional processes may affect these compositions. Furthermore, recent discoveries of pyrite more enriched in 34S than coeval sulfate in the rock record (e.g., Ries et al., 2009) and in modern deltaic sediments (e.g., Aller et al., 2010) have indicated a need to develop a better understanding of the controls on isotopic fractionation during sulfur cycling in natural environments. Here, we report the results of a controlled laboratory experiment designed to simulate the repeated oxidative reworking of sediments using a series of sediment columns constructed with bulk carbonate mud from Florida Bay, Florida. A rapid decline in [H2S] was observed in reworked sediments during the first 12 weeks of the experiment. Decreases in the δ34S of sulfide phases and increases in Δ34SSO4-H2S (i.e., the difference between the δ34S of sulfate, δ34SSO4, and that of hydrogen sulfide, δ34SH2S, at a given depth) were also documented across all columns. These results indicate a decline in labile organic matter concentrations within the sediments and a corresponding decrease in MSR rates with time. Complete reoxidation did not generate superheavy pyrite in this study, but did stimulate biological activity through the generation of sharp redox boundaries. Partial oxidation of aqueous sulfide and an associated increase in residual δ34SH2S must thus be key if oxidation itself is important to superheavy pyrite formation. These findings further suggest that organic matter lability may have played a more fundamental role than [SO42-] in regulating MSR fractionation throughout Earth history and provide motivation for future research.

  4. Effect of physical sediments reworking on hydrocarbon degradation and bacterial community structure in marine coastal sediments.

    PubMed

    Duran, Robert; Bonin, Patricia; Jezequel, Ronan; Dubosc, Karine; Gassie, Claire; Terrisse, Fanny; Abella, Justine; Cagnon, Christine; Militon, Cecile; Michotey, Valérie; Gilbert, Franck; Cuny, Philippe; Cravo-Laureau, Cristiana

    2015-10-01

    The present study aimed to examine whether the physical reworking of sediments by harrowing would be suitable for favouring the hydrocarbon degradation in coastal marine sediments. Mudflat sediments were maintained in mesocosms under conditions as closer as possible to those prevailing in natural environments with tidal cycles. Sediments were contaminated with Ural blend crude oil, and in half of them, harrowing treatment was applied in order to mimic physical reworking of surface sediments. Hydrocarbon distribution within the sediment and its removal was followed during 286 days. The harrowing treatment allowed hydrocarbon compounds to penetrate the first 6 cm of the sediments, and biodegradation indexes (such as n-C18/phytane) indicated that biodegradation started 90 days before that observed in untreated control mesocosms. However, the harrowing treatment had a severe impact on benthic organisms reducing drastically the macrofaunal abundance and diversity. In the harrowing-treated mesocosms, the bacterial abundance, determined by 16S rRNA gene Q-PCR, was slightly increased; and terminal restriction fragment length polymorphism (T-RFLP) analyses of 16S rRNA genes showed distinct and specific bacterial community structure. Co-occurrence network and canonical correspondence analyses (CCA) based on T-RFLP data indicated the main correlations between bacterial operational taxonomic units (OTUs) as well as the associations between OTUs and hydrocarbon compound contents further supported by clustered correlation (ClusCor) analysis. The analyses highlighted the OTUs constituting the network structural bases involved in hydrocarbon degradation. Negative correlations indicated the possible shifts in bacterial communities that occurred during the ecological succession.

  5. Fact Sheets and Questions and Answers for the Final Air Toxics Rules for the Aerospace Manufacturing and Rework Industry

    EPA Pesticide Factsheets

    This page contains the July 1995 final rule fact sheet and the January 2015 proposed rule fact sheet that contains information on the National Emission Standards for Aerospace Manufacturing and Rework Facilities, as well as a 2001 Q&A document on the rule

  6. An economic production model for deteriorating items and time dependent demand with rework and multiple production setups

    NASA Astrophysics Data System (ADS)

    Uthayakumar, R.; Tharani, S.

    2017-04-01

    Recently, much emphasis has given to study the control and maintenance of production inventories of the deteriorating items. Rework is one of the main issues in reverse logistic and green supply chain, since it can reduce production cost and the environmental problem. Many researchers have focused on developing rework model, but few of them have developed model for deteriorating items. Due to this fact, we take up productivity and rework with deterioration as the major concern in this paper. In this paper, a production-inventory model with deteriorative items in which one cycle has n production setups and one rework setup (n, 1) policy is considered for deteriorating items with stock-dependent demand in case 1 and exponential demand in case 2. An effective iterative solution procedure is developed to achieve optimal time, so that the total cost of the system is minimized. Numerical and sensitivity analyses are discussed to examine the outcome of the proposed solution procedure presented in this research.

  7. 43 CFR 3137.112 - What happens if I am prevented from performing actual or constructive drilling or reworking...

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 43 Public Lands: Interior 2 2014-10-01 2014-10-01 false What happens if I am prevented from... prevented from performing actual or constructive drilling or reworking operations? (a) If you demonstrate to BLM that reasons beyond your control prevent you, despite reasonable diligence, from starting actual...

  8. Reworked loess and Yellow River sediment as the main sources of the Chinese Loess Plateau

    NASA Astrophysics Data System (ADS)

    Licht, Alexis; Pullen, Alex; Kapp, Paul; Abell, jordan; Giesler, Dominique

    2016-04-01

    The Quaternary aeolian dust deposits of the Chinese Loess Plateau have been attributed to spring and winter monsoonal storms sweeping clastic material from the deserts of the Asian interior into central China. Recent U-Pb geochronological studies of aeolian zircons have emphasized the existence of two major wind pathways: from the north, throughout the Tengger, and Mu Us deserts during interglacials, and from the west, through the Qaidam Basin during glacials. Others have emphasized the importance of Yellow River supply in the Loess Plateau sediment budget. However, tracking dust source regions through U-Pb dating is particularly complex, given the paucity of data in many potential sources regions and the similar ages peak in the age probability distributions of western and Northern deserts in central China. Here, we present an extended dataset of U-Pb ages covering all the potential provenance areas for the aeolian dust in central Asia and including 2400 new ages from loess, paleosols, modern sand dunes and fluvial deposits. We then propose a new mixture modeling technique to statistically address the contribution of these different sources to the Loess Plateau sedimentary budget. Our contribution estimates indicate that aeolian supply is dominated (60-70 %) by reworking of Yellow River sediment. Moreover, evidence of Qaidam Basin sourced zircons (15-20 %) in both loess (glacial) and paleosols (interglacial) layers corroborates the existence of an erosive wind pathway from the west during glacials and implies that a substantial portion of the interglacial dust is recycled from older glacial loess. We propose that sediment reworking of Yellow River sediment and older loesses by wind homogenizes aeolian zircon populations on the Chinese Loess Plateau toward a glacial provenance due to higher dust accumulation rates during glacials. These findings indicate that the Loess Plateau has evolved as a more dynamic landform than previous thought where wind deflation

  9. Study of thermally reworkable epoxy materials and thermal conductivity enhancement using carbon fiber for electronics packaging

    NASA Astrophysics Data System (ADS)

    Li, Haiying

    Epoxy resins are widely used as the underfill materials for the integrated circuit (IC) chips for the reliability enhancement and as the binder of electrically conductive adhesives (ECA). However, cured epoxy materials are infusible and insoluble networks which is a problem for the repair of a printed circuit board assembly packaged with epoxy materials. In this study, six diepoxides containing aromatic moieties and low temperature degradable linkages, secondary and tertiary benzoates, and carbonates, were synthesized and characterized. Underfills based on four of these epoxides were developed and evaluated respect to their properties and reworkabilility. One of the reworkable underfills was evaluated with the 85°C/85% relative humidity test as the underfill of several ball-grid-array components on a organic board, which showed a high enhanced reliability. Underfill materials based on a synthesized bisphenol-A diepoxide were developed for the no-flow underfill process and were evaluated regarding the application on both tin/lead and lead-free solders. The latent curing mechanism of the catalyst and the influence of fluxing agents were studied. The reworkable underfills showed satisfying overall properties on both Sn/Pb and Sn/Ag/Cu solders. A unique approach for solving the problem of low reliability of ECAs was demonstrated. Small amount of sacrificial metal and alloy powders were added in silver flake based ECA and applied on six pad surfaces. The aging of bulk resistivity and contact resistance of ECA/metal surface pairs were studied and two alloys stabilized the contact resistance on all tested metal surfaces. The internal heat generation of IC devices quickly increases which leads to deteriorated performance and low reliability. The thermally insulating property of polymeric underfills make this even worse with slow heat dissipation. In this study, a carbon fiber of high thermal conductivity was used together with silica in epoxy underfill materials and a 300

  10. Disturbance of benthic infauna by sediment-reworking activities of the lugworm Arenicola marina

    NASA Astrophysics Data System (ADS)

    Flach, E. C.

    The influence of the lugworm Arenicola marina on the abundance of other benthic species was studied in the westernmost part of the Wadden Sea. Small squares (1 m 2) within depopulated 144-m 2 plots were recolonized with various (naturally-occurring) lugworm densities (0-10-20-40-80 and 0-25-50-75-100 per m 2). These plots were sampled during the summer. Lugworms were found to have a strongly negative effect on the densities of C. volutator. At 0-density lugworms, the numbers of C. volutator were high. These were halved at 17 lugworms per m 2 ( i.e. the mean density on the tidal flats of the Dutch Wadden Sea), and were further reduced at higher lugworm densities ( e.g. 20% remained at 40 lugworms per m 2). Laboratory observations of Corophium behaviour in the presence of Arenicola suggest that sediment-reworking lugworms stimulate Corophium to emigrate. Effects of lugworms on other benthic species were also studied in the same way. Lugworms were found to have strongly negative effects on the juvenile densities of various worm and bivalve species ( Nereis diversicolor, Nephtys hombergii, Heteromastus filiformis, Scoloplos armiger, Pygospio elegans, Capitella capitata and Mya arenaria, Cerastoderma edule, Macoma balthica, Angulus tenuis, respectively).

  11. Early Cretaceous extensional reworking of the Triassic HP-UHP metamorphic orogen in Eastern China

    NASA Astrophysics Data System (ADS)

    Lin, W.; Ji, W.; Faure, M.; Wu, L.; Li, Q. L.; Shi, Y.; Scharer, U.; Wang, F.; Wang, Q.

    2015-12-01

    Corresponding to the Early Mesozoic continental subduction between the North China Block (NCB) and the South China Block (SCB), the Tongbaishan-Hong'an-Dabieshan-Sulu massifs are famous for their HP-UHP metamorphism. More than 50% of the HP-UHP Orogenic Belt was significantly reworked by Early Cretaceous extensional tectonics. This Early Cretaceous event with a fast cooling period, at 130-120 Ma, superimposed on the Early Mesozoic HP-UHP orogenic belt and intensively changed the architecture of this orogen. Each individual segment documents different Early Cretaceous extensional structures, namely the central Tongbaishan domain is a metamorphic core complex (MCC) represented by an A-type non-cylindrical antiform; the central Dabieshan domain is a typical Cordilleran-type migmatite-cored MCC; the Southern Sulu UHP domain is a "wedge-shaped" structure exhumed by a simple detachment fault. These late stage extensional structures expose the previous HP-UHP orogenic belt as fragments along the NCB-SCB boundary. The geodynamic setting of this Early Cretaceous extensional tectonics along the HP-UHP orogen is a part of a 1000 km-scale crustal extension belt that is widespread in eastern Eurasia continent from Trans-Baikal to the central part of the South China Block. Convective erosion or delamination of the mantle lithosphere might be considered as a possible mechanism for mantle removal.

  12. Early Cretaceous extensional reworking of the Triassic HP-UHP metamorphic orogen in Eastern China

    NASA Astrophysics Data System (ADS)

    Lin, Wei; Ji, Wenbin; Faure, Michel; Wu, Lin; Li, Qiuli; Shi, Yonghong; Scharer, Urs; Wang, Fei; Wang, Qingchen

    2015-11-01

    Corresponding to the Early Mesozoic continental subduction between the North China Block (NCB) and the South China Block (SCB), the Tongbaishan-Hong'an-Dabieshan-Sulu massifs are famous for their HP-UHP metamorphism. More than 50% of the HP-UHP Orogenic Belt was significantly reworked by Early Cretaceous extensional tectonics. This Early Cretaceous event with a fast cooling period, at 130-120 Ma, superimposed on the Early Mesozoic HP-UHP orogenic belt and intensively changed the architecture of this orogen. Each individual segment documents different Early Cretaceous extensional structures, namely the central Tongbaishan domain is a metamorphic core complex (MCC) represented by an A-type non-cylindrical antiform; the central Dabieshan domain is a typical Cordilleran-type migmatite-cored MCC; the Southern Sulu UHP domain is a "wedge-shaped" structure exhumed by a simple detachment fault. These late stage extensional structures expose the previous HP-UHP orogenic belt as fragments along the NCB-SCB boundary. The geodynamic setting of this Early Cretaceous extensional tectonics along the HP-UHP orogen is a part of a 1000 km-scale crustal extension belt that is widespread in eastern Eurasia continent from Trans-Baikal to the central part of SCB. Convective erosion or delamination of the mantle lithosphere might be considered as a possible mechanism for mantle removal.

  13. A new quantitative approach to identify reworking in Eocene to Miocene pollen records from offshore Antarctica using red fluorescence and digital imaging

    NASA Astrophysics Data System (ADS)

    Strother, Stephanie L.; Salzmann, Ulrich; Sangiorgi, Francesca; Bijl, Peter K.; Pross, Jörg; Escutia, Carlota; Salabarnada, Ariadna; Pound, Matthew J.; Voss, Jochen; Woodward, John

    2017-04-01

    Antarctic palaeoclimate evolution and vegetation history after the formation of a continent-scale cryosphere at the Eocene-Oligocene boundary, 33.9 million years ago, has remained a matter of controversy. In particular, the reconstruction of terrestrial climate and vegetation has been strongly hampered by uncertainties in unambiguously identifying non-reworked as opposed to reworked sporomorphs that have been transported into Antarctic marine sedimentary records by waxing and waning ice sheets. Whereas reworked sporomorph grains over longer non-successive geological timescales are easily identifiable within younger sporomorph assemblages (e.g. Permian sporomorphs in Pliocene sediments), distinguishing non-reworked from reworked material in palynological assemblages over successive geological time periods (e.g. Eocene sporomorphs in Oligocene sediments) has remained problematic. This study presents a new quantitative approach to identifying non-reworked pollen assemblages in marine sediment cores from circum-Antarctic waters. We measured the fluorescence colour signature, including red, green, and blue fluorescence; brightness; intensity; and saturation values of selected pollen and spore taxa from Eocene, Oligocene, and Miocene sediments from the Wilkes Land margin Site U1356 (East Antarctica) recovered during Integrated Ocean Drilling Program (IODP) Expedition 318. Our study identified statistically significant differences in red-fluorescence values of non-reworked sporomorph taxa against age. We conclude that red fluorescence is a reliable parameter for identifying the presence of non-reworked pollen and spores in Antarctic marine sediment records from the circum-Antarctic realm that are influenced by glaciation and extensive reworking. Our study provides a new tool to accurately reconstruct Cenozoic terrestrial climate change on Antarctica using fossil pollen and spores.

  14. Evidence for large-scale reworking of Campanian sediments into the Upper Maastrichtian Peedee formation at Burches Ferry, South Carolina

    USGS Publications Warehouse

    ,; Christopher, R.A.; Prowell, D.C.

    2002-01-01

    A 44-ft-deep corehole (FLO-311) was drilled at Burches Ferry, Florence County, S.C., in order to document the lithologic and paleontologic characteristics of the boundary between the upper Campanian Donoho Creek Formation and the upper Maastrichtian Peedee Formation. Palynomorph and calcareous nannofossil data provide detailed age control for these sediments. Examination of calcareous nannofossil assemblages shows that sediments from the type locality of the Peedee Formation consist largely of reworked Campanian materials. Robust Campanian species such as Reinhardtites anthophorus, Reinhardtites levis, and Stoverius asymmetricus commonly are found reworked into the Maastrichtian Peedee Formation in its entirety. Therefore, identification of lower upper Maastrichtian sediments is based on the presence of background assemblages rather than on the more traditional marker species. The presence of species restricted to the latest Campanian at the Donoho Creek-Peedee contact in outcrop indicates that the entire sedimentary package represented by calcareous nannofossil Zones CC23 and CC24 has been removed.

  15. Micro-trace fossils reveal pervasive reworking of Pliocene sapropels by low-oxygen-adapted benthic meiofauna.

    PubMed

    Löhr, S C; Kennedy, M J

    2015-03-12

    Animal burrowers leave an indelible signature on the sedimentary record in most marine environments, with the seeming exception of low-oxygen environments. In modern sedimentary settings, however, sub-millimetre-sized benthic animals (meiofauna) are adapted to low oxygen and even sulfidic conditions. Almost nothing is known about their impact on ancient marine sediments because they leave few recognizable traces. Here we show, in classic Pliocene-aged anoxic facies from the Mediterranean, the first reported trace fossil evidence of meiofaunal activity and its relation to changing oxygenation. A novel approach utilizing electron imaging of ion-polished samples shows that meiofauna pervasively reworked sediment under oxygen-depleted conditions that excluded macrofauna, fragmenting organic laminae and emplacing 15- to 70-μm-diameter faecal pellets without macroscopically influencing the fabric. The extent of reworking raises the question: how pervasively altered are other sediments presently assumed to lack animal influence and how far into the geological record does this influence extend?

  16. Brachyuran crab community structure and associated sediment reworking activities in pioneer and young mangroves of French Guiana, South America

    NASA Astrophysics Data System (ADS)

    Aschenbroich, Adélaïde; Michaud, Emma; Stieglitz, Thomas; Fromard, François; Gardel, Antoine; Tavares, Marcos; Thouzeau, Gérard

    2016-12-01

    This study in French Guiana evaluates the changes of crab assemblages and their bioturbation activities between mangrove early stages (pioneer and young mangrove) and within stages by taking their spatial heterogeneity (tidal channels, flat areas, pools) into account. The results show differences in crab assemblage structure between and within the early stages of mangrove in relation to microhabitat and sediment characteristics. The sediment reworking rates are a function of the biomass or density of particular species (Ucides cordatus, Uca cumulanta) and burrower functional groups. Crab species or functional interactions mediate changes in sediment reworking rates suggesting the need to consider entire benthic communities rather than single species. This study suggests that the role of the microhabitat in determining the biologically-induced sediment reworking rates depends on the age of the mangrove. Feeding activity results in a sediment turnover of 11.7 ± 9.7 gdw m-2 day-1 and 6.8 ± 3.0 gdw m-2 day-1 in the pioneer and young mangroves, respectively. Burrow maintenance excavates 40.5 ± 7.4 gdw m-2 day-1 and 251.3 ± 419.7 gdw m-2 day-1 in the pioneer and young mangroves, respectively. Upscaling to the studied area (Sinnamary estuary: 6 km2), shows that 500 tons.day-1 and 20 tons.day-1 of sediments could be excavated and pelletized, respectively, during the spring tides of the dry season. Thus, biological sediment reworking would greatly contribute to the sedimentary dynamics of the Guianese mangroves under Amazonian influence.

  17. Barrier island evolution and reworking by inlet migration along the Mississippi-Alabama gulf coast

    SciTech Connect

    Rucker, J.B.; Snowden, J.O. )

    1990-09-01

    The five barrier islands along the Mississippi-Alabama coast are located 10 to 14 mi (16 to 23 km) offshore and separate Mississippi Sound from the Gulf of Mexico. The barrier islands in the chain are, from east to west: Dauphin Island, Petit Bois Island, Horn Island, Ship Island, and Cat Island. The islands are low sand bodies situated on a relatively broad Holocene sand platform that extends 70 mi (113 km) from Dauphin Island on the east to Cat Island on the west. The platform varies in thickness from 25 to 75 ft (7.6 to 23 m) and rests on Holocene marine clays or on Pleistocene sediments. The barrier island chain predates the St. Bernard lobe of the Mississippi delta complex, which began to prograde about 3,000 years ago, and continued until it was abandoned approximately 1,500 years ago. In contrast to the other islands, Cat Island at the western down-drift end of the Mississippi-Alabama barrier island chain is characterized by more than 12 prominent east west-oriented progradational linear ridges. The ridge system of Cat Island is interpreted as a relict of an earlier stage in the life cycle of the barrier platform when there was a more robust littoral drift system and an abundant sediment supply During the Pre-St. Bernard Delta period of vigorous sedimentation, all of the islands in the barrier chain probably exhibited progradational ridges similar to those now found only on Cat Island. Presently, only vestigial traces of these progradational features remain on the islands to the east of Cat Island. Unlike Cat Island, which has been protected and preserved by the St. Bernard Delta, the other barrier islands have been modified and reworked during the past 1,500 years by processes of island and tidal inlet migration, accompanied by a general weakening of the littoral drift and a reduction of the available sediment supply.

  18. Hillslope failure and paraglacial reworking of sediments in response to glacier retreat, Fox Valley, New Zealand.

    NASA Astrophysics Data System (ADS)

    McColl, Samuel T.; Fuller, Ian C.; Anderson, Brian; Tate, Rosie

    2017-04-01

    Climate and glacier fluctuations influence sediment supply to glacier forelands, which in turn influences down-valley hazards to infrastructure and tourism within glacier forelands. At Fox Glacier, one of New Zealand's most iconic and popular glaciers, rapid retreat has initiated a range of hillslope and valley floor responses, that present a cascade of hazards and changes that need to be carefully managed. Fox Glacier has retreated many kilometres historically, with 2.6 km of retreat since the mid-20th century, and a phase of rapid retreat of 50-340 m per year since 2009. To study the system response to past and ongoing glacial retreat at the Fox valley, morphological changes are being observed using time-lapse photography and the annual collection of high-resolution digital elevation models (DEMs) and orthophoto mosaics. The DEMs are being produced using Structure from Motion photogrammetry from UAV/RPAS and helicopter platforms, and are being used, along with manual ground surveying, to produce ground surface change models (DoDs; DEMs of Difference) and sediment budgets for the valley. Results from time-lapse photography and DoDs show that glacial retreat has initiated destabilisation and (mostly chronic) mass movement of surficial glacial sediments on the valley slopes near the glacier terminus. Alluvial fans farther down valley are actively growing, reworking glacial and landslide sediments from tributary catchments. These paraglacial sediments being delivered to the proglacial river from the glacier terminus and alluvial fans are driving aggradation of the valley floor of decimetres to metres per year and maintaining a highly dynamic braid plain. Valley floor changes also include the melting of buried dead ice, which are causing localised subsidence at the carpark and one of the alluvial fans. The unstable slopes and active debris fans, aggrading and highly active river channel, ground subsidence, add to the spectacle but also the hazards of the Fox valley

  19. A mid to late Holocene history of floodplain and terrace reworking along the middle Delaware River valley, USA

    NASA Astrophysics Data System (ADS)

    Stinchcomb, Gary E.; Driese, Steven G.; Nordt, Lee C.; Allen, Peter M.

    2012-10-01

    This study tests and refines the traditional floodplain development model for the partly confined middle Delaware River valley, which has shown that the main channel was relatively stable and flanked by a 6000-8000 year old, vertically accreting alluvial terrace. The Holocene alluvial processes and history presented here in 6 fluvial phases were reconstructed using morphostratigraphy, 36 profile descriptions, 332 grain size analyses, and 82 14C ages from soil trenches, auger borings, and archaeological excavations. Fluvial phases I-III largely validate previous reconstructions showing a late Pleistocene (I: > 10.7 ka) braided stream transition into an early Holocene wandering stream with prolonged floodplain stability (II: 10.7-8 ka), followed by early-middle Holocene erosion and then deposition (III: 8-5 ka). The early and middle Holocene changes in alluvial stratigraphy and sedimentology broadly correlate with climatically derived Holocene subdivisions, suggesting climate change partly controls alluvial response along the middle Delaware River valley. This study documents for the first time a middle Holocene episode of channel incision occurring sometime between 6.0 and 5.0 ka. Although the results reconfirm that the majority of alluvial landforms are composed of vertical accretion deposits, we present here new evidence of oblique, abandoned channel, and lateral accretion deposits inset to similar landforms with different formation histories (i.e., polycyclic terrace development), depicting a river valley that has experienced floodplain and terrace reworking. The majority of floodplain and terrace reworking occurs during the late-middle and late Holocene phases IV-VI (5.5-0 ka), following the middle Holocene incision event. These phases demonstrate floodplain reworking processes in the form of channel abandonment, stripping, flood channeling, and convex bank erosion. The subsequent space filled rapidly with evidence of multistory soil formation, and eventually

  20. Left Behind: Effects of marine reworking and sea-level rise on deltas of the 21st century (Invited)

    NASA Astrophysics Data System (ADS)

    Ashton, A. D.; Nienhuis, J.; Ortiz, A. C.; Lorenzo Trueba, J.; Giosan, L.

    2013-12-01

    The 21st century will represent a time of punctuated change for the morphology of the world's deltas as they face the doubled-edged impacts of sediment reduction during reservoir infilling and submergence by rising sea levels. This research focuses on the controls on the evolution of deltas strongly affected by marine processes, namely wind waves, with a particular emphasis on reworking. Our objective is to apply process-based quantitative means to advance our observational knowledge of how changes in sediment supply and accommodation growth through sea-level rise manifest through delta reworking and the delta cycle. Building upon previous research highlighting how the angle of approaching waves can leave a fingerprint on a delta's shape, we investigate how the coastal conditions prior to sediment cessation can be used to predict the morphologic shape of the ensuing reworked shore along and adjacent to the former delta, including the potential for forming spits and other features indicative of lobe abandonment. In general, reworking results in rapid retreat near the mouth, but tends to be mass conservative, with eroded shoreface-compatible sediment deposited distally along the shoreline. Sediment cessation stops growth, but does not necessarily mean a delta plain will shrink. This marine reworking can be better understood using analogues of wave-influenced delta lobes that have been subjected to large-scale avulsions over the late Holocene, such as the Ebro, Danube, and Volta deltas. While the effects of sediment reduction will tend to be focused around active river mouths, a rising sea will, in a manner, 'sink all coasts'. Although models of stratigraphic delta evolution typically focus on the active depositional phase of profile evolution, with the wave-affected shoreface acting as a conduit of sediment basinwards, passive coasts demonstrate that coastal systems can remain intact during rising sea level and without sediment sources. As such, passive margin

  1. National Emission Standards for Aerospace Manufacturing and Rework Facilities: Summary of Requirements for Implementing the National Emission Standards for Hazardous Air Pollutants (NESHAP)

    EPA Pesticide Factsheets

    This summary of implementation requirements document for the Aerospace Manufacturing and Rework facilties NESHAP was originally prepared in August 1997, but it was updated in January 2001 with a new amendments update.

  2. Reworking of structural inheritance at strike-slip restraining-bends: templates from sandbox analogue models

    NASA Astrophysics Data System (ADS)

    Nestola, Yago; Storti, Fabrizio; Cavozzi, Cristian; Magistroni, Corrado; Meda, Marco; Piero Righetti, Fabrizio

    2016-04-01

    Structural inheritance plays a fundamental role during crustal deformation because pre-existing fault and shear zones typically provide weakness zone suitable to fail again when affected by a new regional stress field. Re-activation of structural inheritance is expected to unavoidably increase the complexity of structural architectures, whose geometric and kinematic patterns can significantly deviate from what expected in newly deformed crustal sectors. Availability of templates from analogue models can provide a very effective tool to help unraveling such a structural complexity. For this purpose, we simulated the reworking of a set of basement hosted pre-existing fault zones at strike-slip restraining fault bends. In the models, the mechanical stratigraphy consists of a basement, made of a mixture of dry kaolin and sand to slightly increase cohesion, and a sedimentary cover made by pure dry sand. Inherited fault zones are confined to the basement and coated by a thin veneer of silicone putty. In the experimental programme, the geometry of the left-lateral restraining bend is maintained the same, with a bending angle of 30° of the restraining fault segment. The strike of the inherited fault zones, measured counterclockwise with respect to that of the master strike-slip fault zone outside the restraining bend, was 0°, 30°, and 60° in different experiments, respectively. An end member experiment without inheritance was also run for comparison. Our experimental results show that the angle that the inherited fault zones make with the restraining bend plays a fundamental role in governing the deformation pattern. When structural inheritance is near parallel to the master strike-slip fault zone, synthetic shears form and severely compartmentalize the transpressional pop-up anticline growing on top of the restraining bend. Fault-bounded blocks undergo sinistral escape during transpression. On the other hand, when structural inheritance makes a high angle to the

  3. Reworked planktonic Foraminifera from the Late Rupelian of the southern Upper Rhine Graben and their palaeogeographic and biostratigraphic implications

    NASA Astrophysics Data System (ADS)

    Pirkenseer, C.; Spezzaferri, S.; Berger, J.-P.

    2009-04-01

    During the Late Rupelian the widespread second transgression (corresponding to international Ru2-3 transgressions; BERGER et al. 2005) affected the whole Upper Rhine Graben basin and led to the deposition of the several hundred meters thick marine "Série grise". An abrupt transition (erosion surface) between the uppermost "Série grise" and Niederroedern Formation indicates the change to fluviatile and lacustrine conditions throughout the basin close to the Late Rupelian / Early Chattian boundary. Abundant reworked Middle to Late Cretaceous (e.g., Marginotruncana pseudolinneiana) and Late Paleocene to Late Eocene (e.g., Acarinina bullbrooki, Morozovella subbotinae, Turborotalia cocoaensis) ranging planktonic Foraminifera occur in the "Série Grise" and equivalent lithological units of the Upper Rhine Graben and the Mainz Basin (e.g., FISCHER 1965, PIRKENSEER 2007, SCHÄFER & KUHN 2004). At least Late Cretaceous, Ypresian, Lutetian and Priabonian ages of source sediments are indicated by the overlapping biostratigraphic ranges of the reworked specimens. Abundant reworked material first appears in the lower "Couches à Mélettes" and reaches its acme in the increasingly "Marnes à Cyrènes" (terminal "Série grise"). Only sparse records are documented from the subsequent terrestrial Niederroedern Formation. These reworking events are linked to intervals of increased clastic input throughout the "Série grise". The planktonic Foraminifera are proposed to be reworked from related alpine deposits (later Helvetikum?) via a northwards trending fluviatile system, as no autochthonous Cretaceous and Early to Middle Eocene marine sediments were deposited within the graben basin. Furthermore other possible source areas (e.g., Paris Basin) were either not connected to the Upper Rhine Graben or were not subject to erosion in the Late Rupelian. This accords with the proposition (ROUSSÉ 2006) of a vast northwards prograding delta-system that was located close to the southern

  4. Pan-African granulite facies reworking along Moyar shear zone, south India: Implications for Gondwanaland assembly

    NASA Astrophysics Data System (ADS)

    Bhadra, Subhadip; Nasipuri, Pritam

    2014-05-01

    ER: Fe-Bt + Mg-Grt → Mg-Bt + Fe-Grt) equilibria. Mineral and isopleth thermobarometry constrain the peak metamorphic condition at 900 oC, 9.5 kbar implying high pressure granulite facies metamorphism. ReNTR and ReER equilibria were constrained to be closed respectively at 740 oC, 8 kbar and 650 oC, 7 kbar. Geo-speedometric analyses reveal very rapid cooling in the order of >150 oC/Ma, at least during the initial stages of retrograde metamorphism. This estimate is commensurate with strong Mn kick up near the garnet rim along Fe+Mg-Ca+Mn+profiles and absence of any symplectectic phases through break down of porphyroblastic garnet. High-P granulite facies metamorphism and subsequent cooling decompression path, documented in this study, in conjugation with reported Neoproterozoic Sm-Nd garnet ages (624-591 Ma) from the quartzo-feldspathic gneiss bear semblance with Pan-African HT-UHT reworking along Palghat-Cauvery Shear Zone (521 Ma) that was culminated with the closure of Paleo-Mozambique ocean during east and west Gondwanaland assembly. We envisaged that peak granulite facies metamorphism in MSZ marks the onset of paleo-Mozambique ocean closure in the northern part of SGT. Rapid exhumation along MSZ was possibly engineered by early Paleozoic tectonic extrusion related processes during final assembly of the Gondwanaland.

  5. Removal of highly crosslinked resists and hybrid polymers for single micro parts fabrication and nanoimprint stamp rework

    NASA Astrophysics Data System (ADS)

    Voigt, Anja; Engelke, Rainer; Ahrens, Gisela; Bullerjahn, Franziska; Schleunitz, Arne; Klein, Jan J.; Grützner, Gabi

    2014-03-01

    Thick photoresists, e.g. up to 1 mm layer thickness, are widely used for the manufacture of high aspect ratio microstructures, e.g. as mould for the fabrication of metallic micro parts. Such resists or materials exhibit high mechanical and chemical stability to non-deformably withstand a pattern transfer process, e.g. by electroplating. After the pattern transfer a solvent based removal is difficult or not possible in many cases. A selective mould removal - without the damage of electroplated metal structures - is required for the fabrication of single micro parts. As second application example UV curable and strongly crosslinkable inorganic-organic hybrid polymers such as OrmoComp ® and OrmoStamp ® are used in UV moulding. The cleaning and rework of these moulds or also of stamps for nanoimprint lithography (NIL) is a challenging task with increasing importance. The life time of an expensive master mould or stamp as well as of the replicated working stamps is important, and therefore the ability to rework such stamps without any defect or decreased resolution. Hence, we demonstrate the application of a plasma-assisted removal using the STP 2020 etching tool from MUEGGE [1] for remote dry etching of strongly crosslinked materials, i.e. the development of processes for the isotropical etching of highly crosslinked photoresists and hybrid polymer materials will be presented. In combination with this specific etching tool this technique shows a high potential to make plasma-assisted removal ready for industrial production.

  6. Episodic Mesozoic thickening and reworking of the North China Archean lower crust correlated to the fast-spreading Pacific plate

    NASA Astrophysics Data System (ADS)

    Zhang, Jun-Bo; Ling, Wen-Li; Liu, Yong-Sheng; Duan, Rui-Chun; Gao, Shan; Wu, Yuan-Bao; Yang, Hong-Mei; Qiu, Xiao-Fei; Zhang, Yong-Qing

    2014-02-01

    A central target in Earth sciences is to understand the processes controlling the stabilization and destruction of Archean continents. The North China craton (NCC) has in part lost its dense crustal root after the Mesozoic, and thus it is a key region to test models of crust-mantle differentiation and subsequent evolution of the continental crust. However, the timing and mechanisms responsible for its crustal thickening and reworking have been long debated. Here we report the Early Cretaceous Yinan (eastern NCC) adakitic granites, for which major/trace elemental models demonstrate that they are complementary to the analogy of the documented eclogitic relicts within the NCC. Based on their Late Archean inherited zircons, depleted mantle Nd model ages of ˜2.8 Ga, large negative ɛNd(t) values (-36.7 to -25.3) and strongly radiogenic initial 87Sr/86Sr ratios (0.7178-0.7264), we suggest that the Yinan adakitic granites were potentially formed by the dehydration melting of a thickened Archean mica-bearing mafic lower crust during the Early Cretaceous (ca. 124 Ma), corresponding to a major period (117-132 Ma) of the NCC Mesozoic intrusive magmatism. Combined previous results, it is shown that the thickening and reworking of the North China Archean lower crust occurred largely as two short-lived episodes at 155-180 Ma and 117-132 Ma, rather than a gradual, secular event. These correlated temporally with the superfast-spreading Pacific plate during the Mesozoic. The synchroneity of these events suggests rapid plate motion of the Pacific plate driving the episodic NCC crustal thickening and reworking, resulting in dense eclogitic residues that became gravitationally unstable. The onset of lithospheric delamination occurred when upwelling asthenosphere heated the base of lower crust to form coeval felsic magmas with or without involvement of juvenile mantle material. Collectively, the circum-Pacific massive crustal production could be attributed to the unusually rapid

  7. Method for reworkable packaging of high speed, low electrical parasitic power electronics modules through gate drive integration

    SciTech Connect

    Passmore, Brandon; Cole, Zach; Whitaker, Bret; Barkley, Adam; McNutt, Ty; Lostetter, Alexander

    2016-08-02

    A multichip power module directly connecting the busboard to a printed-circuit board that is attached to the power substrate enabling extremely low loop inductance for extreme environments such as high temperature operation. Wire bond interconnections are taught from the power die directly to the busboard further enabling enable low parasitic interconnections. Integration of on-board high frequency bus capacitors provide extremely low loop inductance. An extreme environment gate driver board allows close physical proximity of gate driver and power stage to reduce overall volume and reduce impedance in the control circuit. Parallel spring-loaded pin gate driver PCB connections allows a reliable and reworkable power module to gate driver interconnections.

  8. Effect of 3,4,3',4'-tetrachlorobiphenyl on the reworking behavior of Lumbriculus variegatus exposed to contaminated sediment.

    PubMed

    Landrum, Peter F; Leppänen, Matti; Robinson, Sander D; Gossiaux, Duane C; Burton, G Allen; Greenberg, Marc; Kukkonen, Jussi V K; Eadie, Brian J; Lansing, Margaret B

    2004-01-01

    The reworking response (bioturbation) of the oligochaete Lumbriculus variegatus was measured by following the burial rate and spread of a 137Cs marker layer translating worm activity into a biological burial rate (Wb) and a biological diffusion rate constant (Db) for surficial sediment mixing. Reworking was measured at 10 and 22 degrees C in two sediments: a reference site sediment dosed with 3,4,3',4'-tetrachlorobiphenyl (TCBP) and a field-collected sediment from a polychlorinated biphenyl (PCB)-contaminated site in Dicks Creek (DCC, Middletown, OH, USA). The body residue associated with response to TCBP also was determined. Reduction in the temperature from 22 to 10 degrees C reduced both Wb and Db by a factor of approximately two. The internal TCBP concentration to reduce the Wb by 50% was 96 nmol/g (95% CI 45-225 nmol/g) and 124 nmol/g (40-547 nmol/g) (28 and 36 microg/g) wet weight at 22 and 10 degrees C, respectively, and was independent of temperature. The Wb for the DCC sediment was lower than observed for the highest TCBP treatment. The internal body residue for total PCB for worms exposed to DCC sediment was 20-fold lower than TCBP in worms exposed to the lowest TCBP treatment on a molar basis. Comparing body residues of total PCB to TCBP assumes that the PCB congeners act additively on a molar basis. The DCC site contained a higher proportion of coarse material and a lower organic carbon concentration. The difference in sediment characteristics was assumed to be responsible for differences in the Wb.

  9. Late Quaternary floodplain reworking and the preservation of alluvial sedimentary archives in unconfined and confined river valleys in the eastern interior of South Africa

    NASA Astrophysics Data System (ADS)

    Keen-Zebert, A.; Tooth, S.; Rodnight, H.; Duller, G. A. T.; Roberts, H. M.; Grenfell, M.

    2013-03-01

    In this study, geomorphological, sedimentological, and geochronological work was conducted on unconfined and confined reaches of three rivers in the eastern interior of South Africa in order to quantify the relative rates of floodplain reworking and alluvial preservation along river courses with variable valley confinement and lithology. Using optically stimulated luminescence (OSL) dating techniques, new chronologies for the Schoonspruit and Mooi River were created and the existing Klip River chronology was expanded. The results suggest that floodplains in both unconfined and confined reaches preserve complex spatial and temporal patterns of alluviation, although differences in boundary conditions lead to variation in the processes and rates of floodplain construction and reworking. On the Klip and Mooi Rivers where local base levels are stable, channels in unconfined reaches rework floodplain sediments through slow lateral migration punctuated by local erosion during avulsion events. On the Schoonspruit where base level has lowered, the channel in the unconfined reach is incised, the floodplain is abandoned, and a large gully has formed. In the confined reaches of all three rivers, the narrow floodplains are reworked by scour and fill activity and limited lateral migration. The OSL results suggest that unconfined reaches preserve relatively continuous alluvial records that extend into the Pleistocene, while the floodplains in the confined reaches preserve relatively discontinuous alluvial records biased toward the late Holocene. The alluvial geochronologic records in these systems preserve signals of changes in local base level controlled by variation in lithology and incision rather than climate change. By defining the processes, rates, and patterns of floodplain reworking in reaches with different degrees of valley confinement and channel incision, the findings contribute to understanding how rivers build, modify, and preserve alluvial sedimentary archives.

  10. Early Mesozoic deep-crust reworking beneath the central Lhasa terrane (South Tibet): Evidence from intermediate gneiss xenoliths in granites

    NASA Astrophysics Data System (ADS)

    Zhou, Xiang; Zheng, Jian-Ping; Xiong, Qing; Yang, Jing-Sui; Wu, Yuan-Bao; Zhao, Jun-Hong; Griffin, William L.; Dai, Hong-Kun

    2017-03-01

    Understanding the rheological behavior of the Tibetan Plateau and its response to geodynamic processes requires a clear knowledge of the composition, evolution and lithological properties of the deep crust. Here we present U-Pb-Hf isotopes of zircons, bulk-rock geochemistry and mineral compositions for seven intermediate gneiss xenoliths and their host Early Mesozoic granites (205 ± 6 Ma) in the central Lhasa terrane to probe the deep crust beneath Southern Tibet. The xenoliths contain plagioclase, amphibole, titanite, allanite, quartz, biotite and muscovite, with accessory Fe-Ti oxides, apatite and zircon. Bulk-rock and mineral geochemistry suggests that these xenoliths have a magmatic origin and experienced deformation and amphibolite-facies metamorphism (equilibration at pressures of 0.46-0.83 GPa and temperatures of 650 °C), before they were captured by the host granite at 205 Ma. Zircons in these xenoliths show complex microstructures, including inherited cores, magmatic or metamorphic bands, and high U-Th hydrothermal rims. Inherited zircon cores record U-Pb ages from 2277 Ma to 517 Ma. Igneous zircons show a range of concordant U-Pb ages, suggesting a protracted magmatism from 236 Ma to 203 Ma. Metamorphic zircon zones record the timing of amphibolite-facies metamorphism from 224 to 192 Ma, while the high U-Th hydrothermal rims show a subsequent fluid activity until 150 Ma. Unradiogenic Hf isotopic compositions of both xenoliths and host granites [xenolith εHf(t) = - 11.2 to 0; host granite εHf(t) = - 17.3 to - 3.3] indicate that the Early Mesozoic deep crust in the central Lhasa terrane originated mainly from ancient (i.e., Proterozoic) crust, with little or no interaction with juvenile magmas. This study suggests a possible continental differentiation mechanism during crustal reworking; progressive melting may initiate from the lower mafic crust (at ca. 236 Ma) and gradually migrate into the sediment-rich upper crust (until ca. 203 Ma). The reworking

  11. LA-ICP-MS analysis of isolated phosphatic grains indicates selective rare earth element enrichment during reworking and transport processes

    NASA Astrophysics Data System (ADS)

    Auer, Gerald; Reuter, Markus; Hauzenberger, Christoph A.; Piller, Werner E.

    2016-04-01

    water chemistry under certain well constrained circumstances of primary authigenesis. Are these conditions not met, REE patterns are more likely to reflect complex enrichment processes that likely already started to occur during reworking over geologically relatively short time frames. Similarities in the REE patterns of clearly detrital and biogenic phosphate further suggest that the often observed 'hat-shaped' pattern in biogenic phosphates can easily result from increased middle REE (Neodymium to Holmium) scavenging during taphonomic processes prior to final deposition. Finally, cluster analysis coupled with sedimentological considerations proved a valuable tool for the characterization of REE patterns of phosphates in terms of their formation conditions and depositional history, such as the distinction of phosphates formed in situ from reworked and transported phosphate grains.

  12. Spatial and Temporal Variations of the K/T Boundary Record: Implications Concerning Possible Megaseiche in the Reworking Processes

    NASA Astrophysics Data System (ADS)

    Maurrasse, F. J.; Lamolda, M. A.

    2004-05-01

    Major physical disruptions characterize the sedimentary record of the K/T boundary (KTB) layer from different sites in the Southern Peninsula of Haiti as well as in diverse areas of the world. These disturbances are most important within the vicinity of the crater at Chicxulub, Yucatan, Mexico, and 65 million years ago that can be chronologically correlated with the bolide impact postulated by Alvarez et al (1981). At all sites the KTB layer shows spatial and temporal differences even within short distances, and the complexity of its characteristic signals includes serious micropaleontological inconsistencies with mixed biotic assemblages that perpetuate divergence of interpretations, thereby they raise doubts on the timing and real causal mechanisms of the biotic turnover that characterizes the boundary. Indeed, often the biostratigraphic signals are difficult to resolve because of hiatuses, or sediments are highly reworked, and distinct taxonomic successions are not clearly defined. Well defined as well as cryptic primary sedimentary structures within the boundary layer are constant at all outcrops, and they indicate complex, multiphase, subaqueous flow processes that affected sedimentation of the KTB layer at different times. The structures are known to characterize oscillatory wave processes that affect cohesionless sediments, and such water motion is only known to be associated with seiche as a modern analog that may have generated the amalgamation recorded at the KTB layer. We believe that "Megaseiche" associated with the KT impact event and its subsequent effects provides a plausible unifying mechanism to explain how various levels of the water column in different large basins can oscillate to develop the structures observed. Because of the magnitude of the bolide impact that generated initial tsunamis and large seismic waves worldwide, megaseiches of different frequencies and nodal modes must have developed in the oceans worldwide to leave different

  13. Lithospheric reworking at the Proterozoic-Phanerozoic transition of Australia imaged using AusLAMP Magnetotelluric data

    NASA Astrophysics Data System (ADS)

    Robertson, Kate; Heinson, Graham; Thiel, Stephan

    2016-10-01

    Seventy-four stations from the long-period Australia-wide AusLAMP (Australian Lithospheric Architecture Magnetotelluric Project) dataset were used to image the electrical resistivity beneath the Neoproterozoic Ikara-Flinders Ranges and adjacent Palaeo-Mesoproterozoic Curnamona Province. Results from 3D inversions using ModEM software show a relatively resistive Ikara-Flinders Ranges, with two parallel arcuate conductors at 20 to 80 km depth in the Nackara Arc. There is a good correlation of diamondiferous kimberlites occurring over conductors, which we interpret as evidence for these conductors to be residing on large lithospheric structures that have been conduits for partial melt and volatile movement in the Jurassic. The Curnamona Province is remarkably conductive for a region that is thought to have a cratonic core, with Delamerian reworking only at its edges. The conductor covers most of the province at depths of 10-40 km, and its presence at lower crustal depths suggests that conductive sediments can not entirely explain it. Fluids associated with subduction may have pervasively modified the crust in the past, resulting in an enrichment of carbon, enhancing the conductivity. Additionally, we conclude that the notion of a single continuous arcuate Flinders Conductivity Anomaly is unlikely and that the anomalous response observed is instead a result of the combined response of three separate anomalies; the Curnamona Province Conductor and the two Nackara Arc Conductors.

  14. Thermomechanical Fatigue Performance of Lead-Free Chip Scale Package Assemblies with Fast Cure and Reworkable Capillary Flow Underfills

    NASA Astrophysics Data System (ADS)

    Shi, Hongbin; Tian, Cuihua; Ueda, Toshitsugu

    2012-05-01

    In this paper, we present the results of temperature cycling test for full and partial capillary flow underfilled lead-free chip scale packages (CSPs), the tests were carried out on the basis of JEDEC standard. Two kinds of representative fast cure and reworkable underfill materials are used in this study, and CSPs without underfills were also tested for comparison. The test results show that the two underfill materials reduce the thermomechanical fatigue performance of CSP assemblies. The underfill with high Tg and storage modulus yielded better performance; indeed, the coefficient of thermal expansion (CTE) is also very critical to the thermomechanical fatigue performance, but its effects is not so obvious in this study owing to the similar CTEs of the underfills used. In addition, the negative effect of a partial underfill pattern is smaller than that of a full underfill pattern. Failure analysis shows that the dominant failure mode observed is solder cracking near the package and/or printed circuit board pads.

  15. Producer-retailer integrated EMQ system with machine breakdown, rework failures, and a discontinuous inventory issuing policy.

    PubMed

    Chiu, Singa Wang; Chen, Shin-Wei; Chiu, Yuan-Shyi Peter; Li, Ting-Wei

    2016-01-01

    This study develops two extended economic manufacturing quantity (EMQ)-based models with a discontinuous product issuing policy, random machine breakdown, and rework failures. Various real conditions in production processes, end-product delivery, and intra-supply chains such as a producer-retailer integrated scheme are examined. The first model incorporates a discontinuous multi-delivery policy into a prior work (Chiu et al. in Proc Inst Mech Eng B J Eng 223:183-194, 2009) in lieu of their continuous policy. Such an enhanced model can address situations in supply chain environments, where finished products are transported to outside retail stores (or customers). The second model further combines retailer's stock holding costs into the first model. This extended EMQ model is applicable in situations in present-day manufacturing firms where finished products are distributed to company's own retail stores (or regional sales offices) and stocked there for sale. Two aforementioned extended EMQ models are investigated, respectively. Mathematical modeling along with iterative algorithms are employed to derive the optimal production run times that minimize the expected total system costs, including the costs incurred in production units, transportation, and retail stores, for these integrated EMQ systems. Numerical examples are provided to demonstrate the practical application of the research results.

  16. Estimation of relative rate of copper dissolution in wave soldering and through-hole rework process by designing an experiment for soldering parameters and PCB features

    NASA Astrophysics Data System (ADS)

    Nair, Vineethkumar R.

    The thesis details the study of influence of factors such as surface finish of PCB, copper content in PCB barrel, PCB thickness, type of solder alloy, type and process parameters of through-hole soldering process in determining the rates of copper dissolution in different through-hole soldering processes. The research was designed to conduct experiment in two phases. The first phase was to measure the copper dissolution that occurs during machine-based wave soldering processes and analyze the factors influencing it. The second phase was to measure the copper dissolution that occurs during a solder pot rework process and analyze the factors influencing it. The results from the experiment are used to identify the significance and magnitude of influence that each of the factors has on the rate of copper dissolution. These measurements are further used to estimate the rates of copper dissolution during through-hole rework process.

  17. The Use of Computer Simulation of Merged Variation to Predict Rework Levels on Ship’s Hull Blocks (The National Shipbuilding Research Program)

    DTIC Science & Technology

    1987-08-01

    INNOVATION MARINE INDUSTRY STANDARDS WELDING INDUSTRIAL ENGINEERING EDUCATION AND TRAINING THE NATIONAL SHIPBUILDING RESEARCH PROGRAM August 1987 NSRP 0281...National Shipbuilding Research Program 1987 Ship Production Symposium Paper No.4: The Use of Computer Simulation of Merged Variation to Predict Rework...Levels on Ship’s Hull Blocks 5a. CONTRACT NUMBER 5b. GRANT NUMBER 5c. PROGRAM ELEMENT NUMBER 6. AUTHOR(S) 5d. PROJECT NUMBER 5e. TASK NUMBER 5f

  18. Surficial geology of the Kennebec River paleodelta: A product of Pleistocene deposition, modification by Holocene transgression, and modern sediment reworking

    SciTech Connect

    Barnhardt, W.A.; Belknap, D.F. . Dept. of Geolofical Sciences); Kelley, J.T.; Dickson, S.M. )

    1993-03-01

    Large sandy lithosomes, interpreted as paleodeltas, are reported seaward of several major rivers entering the western Gulf of Maine. The lobate, smooth-topped morphology of the Kennebec River paleodelta smothers high-relief bedrock ridges on the inner continental shelf of south-central Maine. Since 1991, 488 km of side-scan sonar records and 116 km of high-resolution seismic reflection profiles were collected in this recently glaciated region. Coupled with 120 previously collected bottom samples and observations from numerous submersible dives, these data were used to map the surficial geology of the area and elucidate its relationship to the late Quaternary stratigraphy. The Kennebec paleodelta formed approximately 12--10 ka when sea level fell to a depth of 60 m and abundant sandy material was delivered to the lowstand shoreline. Subsequent marine transgression with reduced sediment input greatly modified the former delta, creating a patchwork of palimpsest deltaic and relict shoreline features overprinted by younger coastal and shelf processes. As barrier beach and estuarine systems transgressed from the lowstand shoreline to their position at the present coast, shoreface erosion exhumed underlying units, exposing a variety of textural facies across the delta surface. In adjacent areas 15--30 m deep and along much of the seaward margin, elongate bands of rippled gravel are oriented perpendicular to shore, indicating modern sediment reworking and cross-shelf transport. These rippled scour depressions often coincide with older glacial marine sediments cropping out on the surface. Vibracores and current meter measurements collected in 1992 will help resolve many questions concerning the past evolution of the paleodelta and the effects of modern processes on the distribution of surficial sediments.

  19. Google Wave: Collaboration Reworked

    ERIC Educational Resources Information Center

    Rethlefsen, Melissa L.

    2010-01-01

    Over the past several years, Internet users have become accustomed to Web 2.0 and cloud computing-style applications. It's commonplace and even intuitive to drag and drop gadgets on personalized start pages, to comment on a Facebook post without reloading the page, and to compose and save documents through a web browser. The web paradigm has…

  20. Google Wave: Collaboration Reworked

    ERIC Educational Resources Information Center

    Rethlefsen, Melissa L.

    2010-01-01

    Over the past several years, Internet users have become accustomed to Web 2.0 and cloud computing-style applications. It's commonplace and even intuitive to drag and drop gadgets on personalized start pages, to comment on a Facebook post without reloading the page, and to compose and save documents through a web browser. The web paradigm has…

  1. Rethink, Rework, Recycle.

    ERIC Educational Resources Information Center

    Wrhen, Linda; DiSpezio, Michael A.

    1991-01-01

    Information about the recycling and reuse of plastics, aluminum, steel, glass, and newspapers is presented. The phases of recycling are described. An activity that allows students to separate recyclable materials is included. The objectives, a list of needed materials, and procedure are provided. (KR)

  2. Rework the workload.

    PubMed

    O'Bryan, Linda; Krueger, Janelle; Lusk, Ruth

    2002-03-01

    Kindred Healthcare, Inc., the nation's largest full-service network of long-term acute care hospitals, initiated a 3-year strategic plan to re-evaluate its workload management system. Here, follow the project's most important and difficult phase--designing and implementing the patient classification system.

  3. Rethink, Rework, Recycle.

    ERIC Educational Resources Information Center

    Wrhen, Linda; DiSpezio, Michael A.

    1991-01-01

    Information about the recycling and reuse of plastics, aluminum, steel, glass, and newspapers is presented. The phases of recycling are described. An activity that allows students to separate recyclable materials is included. The objectives, a list of needed materials, and procedure are provided. (KR)

  4. Sediment provenance, reworking and transport processes in the Indus River by U-Pb dating of detrital zircon grains

    NASA Astrophysics Data System (ADS)

    Alizai, Anwar; Carter, Andrew; Clift, Peter D.; VanLaningham, Sam; Williams, Jeremy C.; Kumar, Ravindra

    2011-03-01

    We present new major and trace element data, together with U-Pb ages for zircon sand grains from the major tributaries of the Indus River, as well as the adjacent Ghaggar and Yamuna Rivers and from bedrocks within the Sutlej Valley, in order to constrain the origin of the sediment reaching the Arabian Sea. Zircon grains from the upper Indus are generally younger than 200 Ma and contrast with those from the eastern tributaries eroded from Himalayan sources. Grains younger than 15 Ma, which typify the Nanga Parbat Massif, comprise no more than 1-2% of the total, even in the upper Indus, showing that this terrain is not a major sediment producer, in contrast with the Namche Barwe Massif in the eastern Himalayan syntaxis. The Sutlej and Yamuna Rivers in particular are very rich in Lesser Himalayan-derived 1500-2300 Ma zircons, while the Chenab is dominated by 750-1250 Ma zircons, mostly eroded from the Greater Himalaya. The upper Indus, Chenab and Ravi yield zircon populations broadly consistent with the outcrop areas, but the Jhelum and the Sutlej contain many more 1500-2300 Ma zircons than would be predicted from the area of Lesser Himalayan rock within their drainages. A significant population of grains younger than 200 Ma in the sands of the Thar Desert indicates preferential eolian, monsoon-related transport from the Indus lower reaches, rather than reworking from the local rivers. Modelling of observed zircon ages close to the delta contrasts with modern water discharge. The delta is rich in zircons dating 1500-2300 Ma, while discharge from modern rivers carrying such grains is low. The modest size of the Sutlej, the richest source of these materials in the modern system, raises the possibility that the compositionally similar Yamuna used to flow westwards in the recent past. Our data indicate a non-steady state river with zircon transport times of 5-10 k.y. inferred from earlier zircon dating of delta sands. The modern delta zircons image an earlier, likely

  5. Late Quaternary aeolian sand deposition sustained by fluvial reworking and sediment supply in the Hexi Corridor - An example from northern Chinese drylands

    NASA Astrophysics Data System (ADS)

    Nottebaum, Veit; Lehmkuhl, Frank; Stauch, Georg; Lu, Huayu; Yi, Shuangwen

    2015-12-01

    Aeolian deposits are frequently used for palaeoenvironmental change studies. Their formation depends on an array of requirements: the supply of material suitable for aeolian transport and favorable conditions of sediment availability and wind strength. In order to infer palaeoenvironmental information from aeolian sand deposits these factors need to be carefully evaluated. We present a study from northern Chinese Hexi Corridor, based on 11 optically stimulated luminescence (OSL) dated sediment sections. These represent interchanging aeolian and alluvial deposits under gravel surfaces and aeolian sand in dune fields interrupted by interdunal flood deposits. Investigations in two subareas reveal contrasting geomorphologic and sedimentary histories: (1) sediment deposition during the Pleistocene-Holocene transition (~ 12 ka) followed by deflation during the Holocene and (2) frequent sediment recycling revealed by a wide spectrum of ages throughout the Holocene. The late glacial sediment pulse recorded in the western Hexi Corridor is attributed to high sediment supply, generated by efficient (peri-)glacial sediment production during glacial times in the adjacent Qilian Shan (< 5700 m asl) and a moisture increase inducing the reworking of those (glacio-)fluvial deposits during the Pleistocene-Holocene transition. The absence of a powerful reworking agent preserved these late glacial deposits in the western Hexi Corridor in contrast to moister eastern parts where Holocene sediment reworking prevailed. Geomorphological and hydrological preconditions of the subareas are discussed and reveal the controlling influence of fluvial processes on sand supply for the aeolian system. While a perennial drainage is missing in the drier western part, the Hei River drainage is fed by higher monsoonal precipitation in the central Hexi Corridor. It maintains a sediment recycling system and has ensured a sufficient sediment supply throughout the Holocene. The study promotes closer

  6. Depositional processes of primary to reworked volcaniclastics on an alluvial plain; an example from the Lower Pliocene Ohta tephra bed of the Tokai Group, central Japan

    NASA Astrophysics Data System (ADS)

    Nakayama, Katsuhiro; Yoshikawa, Shusaku

    1997-01-01

    A change from primary to reworked volcaniclastic deposits in the Lower Pliocene Ohta tephra bed has been identified, using facies analysis. The Ohta tephra bed is a widespread marker-tephra, distributed over a distance of more than 130 km. The source volcano of this tephra is inferred to lie 50 to 100 km north of the most proximal Ohta tephra bed. The Ohta tephra bed shows a change in volcaniclastic facies in distal areas. Eight sedimentary facies are recognized. These are interpreted as pyroclastic fall, pyroclastic flow, and reworked (mudflow, flood flow, channel fill, swamp or backswamp, lacustrine and ephemeral pond) deposits. In underlying and overlying non-volcaniclastic beds, four sedimentary facies are recognized, indicating a fluvio (-lacustrine) depositional system on an alluvial plain. From the successions of volcaniclastic sedimentary facies, deposition of the Ohta tephra bed can be divided into stages I to VI. Each depositional stage is intimately related to volcanic activity. Stage I is the first eruption, during which only the northern part of the study area was covered with fallout ash. The second eruption stage of stage II involved fallout ash distributed over all the study area. These two fallout ash beds are derived from precursor eruptions. Stage III reflects a period of volcanic quiescence and development of widespread lacustrine conditions. The fallout ash may have destroyed vegetation, and prompted greater discharge to form the large lacustrine deposits of stage III. A pyroclastic flow stage in stage IV is associated with an explosive eruption, and resulted in pyroclastic flow deposits reaching the northern part of the study area. Stage V is characterized by mudflow deposits. Widespread mudflow deposits also originated from high water and clastics discharge on the unvegetated surface. Mudflows extend more than 180 km from the source volcano. Abundant supply of volcaniclastic material and high water and clastic discharge enhanced a rapid

  7. Organic-looking' carbon and nitrogen isotope compositions in mantle derived diamondites: Mantle fractionation vs. re-worked crustal organics?

    NASA Astrophysics Data System (ADS)

    Mikhail, Sami; Dubosi, Gabor; Verchovsky, Sahsa; Jones, Adrian; Kurat, Gero

    2010-05-01

    composition (5). There are two ways in which these diamondites could have been formed based on their carbon and nitrogen isotope compositions: (1) Reworking (either recycling via remobilisation of the lower lithosphere or subduction) could have provided the carbon and nitrogen which have preserved their ‘organic-like' signatures; or (2) the loss of 13C rich oxidised carbon from the system by carbonisation of olivine (explaining the lack of olivine inclusions in diamondites) during diamondite crystallisation would result in increasing of the N/C ratio (≈ N ppm) and a drives the carbon isotopic value lighter. The small increase in nitrogen isotopes to more heavy values (at this early stage) is thought to be a function of a small loss of nitrogen from the substrate. This is followed by continuous diamond formation where oxidised carbon is lost via silicate carbonisation and the formation of carbonates (13C enrichment in the source) and nitrogen is removed from the source by being partitioned into the crystallising diamonds (15N enrichment in the source). During such progressive crystallisation of diamondites the carbon and nitrogen isotope compositions can be fractionated to extremely ‘organic-like' values. We find that both models warrant sufficient discussion for this data set. 1.G. Dobosi, G. Kurat, Mineralogy and Petrology 76, 21 (2002). 2.G. Kurat, G. Dobosi, Mineralogy and Petrology 69, 143 (2000). 3.R. Burgess, L. H. Johnson, D. P. Mattey, J. W. Harris, G. Turner, Chemical Geology 146, 205 (1998). 4.M. Honda, D. Phillips, J. W. Harris, I. Yatsevich, Chemical Geology 203, 347 (2004). 5.T. Maruoka, G. Kurat, G. Dobosi, C. Koeberl, Geochimica Et Cosmochimica Acta 68, 1635 (2004). 6.D. A. Shelkov, A. B. Verchovsky, H. J. Milledge, C. T. Pillinger, Chemical Geology 149, 109 (1998). 7.C. Gautheron, P. Cartigny, M. Moreira, J. W. Harris, C. J. Allègre, Earth and Planetary Science Letters 240, 559 (2005). 8.D. E. Jacob, K. S. Viljoen, N. Grassineau, E. Jagoutz, Science 289

  8. The U-Pb, Hf and O isotopic record of ancient detrital zircons in Zimbabwean sediments - formation, reworking and nature of early Archaean crust

    NASA Astrophysics Data System (ADS)

    Bolhar, Robert; Hofmann, Axel; Kemp, Anthony I. S.; Whitehouse, Martin J.; Wind, Sandra; Feng, Yuexing

    2014-05-01

    Hafnium and oxygen isotopic compositions measured in-situ on U-Pb dated zircon from different Archaean sedimentary successions belonging to the 2.9-2.8 Ga Belingwean/Bulawayan Groups and undated Sebakwian Group are presented to better define the crustal evolution of the Zimbabwe Craton prior to 3.0 Ga. Textural and compositional criteria were employed to minimize effects arising from Pb loss, metamorphic overprinting and interaction with low temperature fluids. 207Pb/206Pb age spectra (concordance > 90%) reveal prominent peaks at 3.8, 3.6, 3.5, and 3.35 Ga, corresponding to documented geological events both globally and within the Zimbabwe craton. O isotope compositions of ~ 4 - 10 opoint to both derivation from magmas in equilibrium with mantle and the assimilation of supracrustal material or interaction with metamorphic fluids. In ɛHf-time space, 3.8-3.6 Ga grains define an array consistent with derivation from a mafic to intermediate source reservoir (Lu/Hf ~0.015) that separated from chondritic mantle at ~ 3.9 Ga. Crustal domains formed after 3.6 Ga depict a more complex evolution, involving contribution from juvenile mantle sources and reworking of pre-existing crust. Importantly, initial Hf isotopic compositions document a protracted history of remelting, without evidence for significant mantle depletion prior to 3.35 Ga. This suggests that production of earliest crust in the Zimbabwe Craton did not cause complementary enriched and depleted reservoirs, possibly because heterogeneous mantle was effectively remixed by rapid convection due to higher temperatures in the early Archaean or the volume of crust was too small in volume to influence the isotopic mantle evolution. Similar Hf-O-time relationships observed in southern West Greenland were used as a basis to propose a transition in geodynamics 3.2 Ga ago. The absence of detrital zircons with crystallization ages > 3.8 Ga, along with a simple ɛHf-time array consistent with reworking of a mafic protolith

  9. National emission standards for hazardous air pollutants (NESHAP) for the aerospace manufacturing and rework industry: Background information for promulgated standards -- Addendum. Final report

    SciTech Connect

    1998-07-01

    On September 1, 1995, the US Environmental Protection Agency (EPA) promulgated national emission standards for hazardous air pollutant (NESHAP) emissions from major sources in the aerospace industry. These final standards implemented Section 112(d) of the Clean Air Act as amended in 1990 (the Act). Amendments to the final rule were promulgated on March 27, 1998. Also on March 27, 1998, the EPA proposed additional amendments to the final rule. Nineteen comment letters were submitted by representatives from fifteen companies or organizations, consisting of general aviation rework and manufacturing facilities, paint arrestor and filtration product manufacturers, filter testing laboratories, major aerospace (equipment) manufacturers, and industry trade associations. This document is an addendum to volume 2 of National Emission Standard for Hazardous Air Pollutants (NESHAP) for the Aerospace Industry -- Background Information for Promulgated Standards, July 1995.

  10. Growth of continental crust and its episodic reworking over >800 Ma: evidence from Hf-Nd isotope data on the Pietersburg block (South Africa)

    NASA Astrophysics Data System (ADS)

    Laurent, Oscar; Zeh, Armin; Moyen, Jean-François; Doucelance, Régis; Martin, Hervé

    2014-05-01

    The formation and evolution of the continental crust during the Precambrian, and in particular during the Archaean eon (4.0-2.5 Ga), is still a matter of debate. In particular, it is not yet clear in which tectonic environment the genesis of crust took place and how the large volume of granitoid rocks that form ~70% of the Archaean crust were extracted from the mantle. Many studies highlighted that radiogenic isotope systems, especially Lu-Hf and Sm-Nd, are powerful tools to unravel the respective extent of crustal growth and recycling in Archaean terranes. This work presents coupled Hf and Nd isotope data (analyzed both in situ in accessory minerals and in whole rock samples) of Meso- to Neoarchaean granitoids, applied to unravel the processes of crust formation and evolution of the Pietersburg crustal block in South Africa. This crustal segment, the northermost one of the Archaean Kaapvaal Craton, is separated from older crust (3.65-3.10 Ga) by a large-scale suture zone, and the processes related to amalgamation of both blocks and their subsequent evolution are still unclear. The Pietersburg block is made up of a wide range of Archaean granitoid rocks, including tonalite-trondhjemite-granodiorite (TTG) series, high-K monzogranites as well as (grano)diorites belonging to the so-called "sanukitoid" group [1], all intruded by late Paleoproterozoic alkaline complexes. Age determinations highlighted two stages of granitoid formation: (1) TTG magmatism took place episodically over >400 Ma between 3.34 and 2.89 Ga, with a major pulse at 2.97-2.90 Ga; while (2) all the other (high-K) granitoid types emplaced subsequently between 2.84 and 2.69 Ga before a long magmatic shutdown until the intrusion of alkaline complexes at ~2.00 Ga [2-3]. Isotope systematics reveal that these two stages are related to juvenile crust formation and crust reworking, respectively. Indeed, all Hf-Nd isotope data from TTG gneisses are suprachondritic, pointing to a juvenile origin and precluding

  11. Debris Flow Initiation and Fan Reworking in the Green River Canyons of the Eastern Uinta Mountains: The Limited Role of Wildfire and the Significance of Low-Magnitude Floods

    NASA Astrophysics Data System (ADS)

    Larsen, I. J.; Schmidt, J. C.; Pederson, J. L.; Martin, J. A.

    2003-12-01

    The primary determinant on channel organization of the Green River in the canyons of the eastern Uinta Mountains is the occurrence and frequency of debris flows in tributary watersheds. The frequency of these debris flows appears to be related to climatic factors, not factors related to wildfire. Debris flows in the eastern Uinta Mountains occur by a process known as the firehose effect, wherein overland flow generated on bedrock slopes cascades down steep cliffs and saturates and impacts colluvium stored in bedrock hollows. The colluvium fails, initiating debris flows that travel downslope to the Green River. The dry climate and high-strength bedrock cause hillslopes to be weathering-limited, prohibiting the formation of extensive regolith and vegetative cover. This reduces the degree vegetation regulates geomorphic processes and, in turn, causes wildfire to have little influence on debris flow initiation; slight increases in watershed runoff do not appear to alter the likelihood of this process occurring. A secondary determinant on channel organization in debris fan-dominated canyons are the magnitude of mainstem discharges and the degree to which they rework debris flow deposits; in this case flows are regulated by Flaming Gorge Dam. Substantial reworking of debris flow deposits can be accomplished by mainstem floods with discharges greater than 75%\\ of the pre-dam two year flood, whereas floods with magnitudes less than 40%\\ of the pre-dam 2-year flood do little reworking.

  12. Reworked pre-Grenville crust and timing of Grenville orogenesis in the southeastern Llano Uplift, Texas: Results from U-Pb geochronometry

    SciTech Connect

    Reese, J.F.; Roback, R.C.; Walker, N.W. . Geological Sciences)

    1992-01-01

    Zircon geochronometry of metaigneous units in the southeastern Llano Uplift (1) show that 1355-1215 Ma rocks were tectonically reworked during the Grenville orogeny, (2) further constrain the timing of Grenville orogenesis along the southern margin of North America, and (3) necessitate revision of previously proposed stratigraphic and structural relations within the Llano Supergroup. Multigrain, abraded zircon fractions from a sample of quartzofeldspathic Valley Spring Gneiss (VSG) define a discordia trajectory with an upper intercept of 1355 [plus minus] 3 Ma, interpreted as the igneous crystallization age of the protolith. This age is the oldest thus far documented for Llano Supergroup protoliths and is substantially older than a recently reported age (1232 [plus minus]4 Ma) from a different part of the VSG. The lithologic and chronometric similarities of the old VSG to rocks to the Mid-continent Granite-Rhyolite terrane raise the possibility of genetic relations between these units. Thus components of the VSG are tentatively interpreted to represent a deformed and metamorphosed part of the southernmost Mid-Continent Granite-Rhyolite terrane. Alternatively, this rock could be part of an ensialic arc built upon the margin of southern North America and later deformed during the Grenville orogeny. Analyses from four abraded zircon fractions from a quartzofeldspathic gneiss in the structurally overlying Packsaddle Schist yield an upper intercept of 1215 [plus minus] 3 Ma, interpreted as the igneous protolith crystallization age. This age is the youngest yet determined for a polydeformed metamorphic rock in the Llano Uplift and more tightly brackets the timing of Grenville deformation in the southeastern Llano Uplift to post-1215 Ma and pre-1098 Ma.

  13. Burial of Emperor Augustus' villa at Somma Vesuviana (Italy) by post-79 AD Vesuvius eruptions and reworked (lahars and stream flow) deposits

    NASA Astrophysics Data System (ADS)

    Perrotta, Annamaria; Scarpati, Claudio; Luongo, Giuseppe; Aoyagi, Masanori

    2006-11-01

    A new archaeological site of Roman Age has been recently found engulfed in the products of Vesuvius activity at Somma Vesuviana, on the northern flank of the Somma-Vesuvius, 5 km from the vent. A 9 m deep, 30 by 35 m trench has revealed a monumental edifice tentatively attributed to the Emperor Augustus. Different than Pompeii and Herculaneum sites which were completely buried in the catastrophic eruption of 79 AD, this huge roman villa survived the effects of the 79 AD plinian eruption as suggested by stratigraphic and geochronologic data. It was later completely engulfed in the products of numerous explosive volcanic eruptions ranging from 472 AD to 1631 AD, which were separated by reworked material and paleosols. The exposed burial sequence is comprised of seven stratigraphic units. Four units are composed exclusively of pyroclastic products each emplaced during a unique explosive event. Two units are composed of volcaniclastic material (stream flow and lahars) emplaced during quiescent periods of the volcano. Finally, one unit is composed of both pyroclastic and volcaniclastic deposits. One of the more relevant volcanological results of this study is the detailed reconstruction of the destructive events that buried the Emperor Augustus' villa. Stratigraphic evidence shows the absence of any deposit associated with the 79 AD eruption at this site and that the building was extensively damaged (sacked) before it was engulfed by the products of subsequent volcanic eruptions and lahars. The products of the 472 AD eruption lie directly on the roman structures. They consist of scoria fall layers intercalated with massive and stratified pyroclastic density current deposits that caused limited damage to the structure. The impact on the building of penecontemporaneous lahars was more important; these caused the collapse of some structures. The remaining part of the building was subsequently entombed by the products of explosive eruptions (e.g. 512/536 eruption, 1631

  14. Mountain building at northeastern boundary of Tibetan Plateau and craton reworking at Ordos block from joint inversion of ambient noise tomography and receiver functions

    NASA Astrophysics Data System (ADS)

    Guo, Zhen; Chen, Yongshun John

    2017-04-01

    We have obtained a high resolution 3-D crustal and uppermost mantle velocity model of the Ordos block and its surrounding areas by joint inversion of ambient noise tomography and receiver functions using seismic recordings from 320 stations. The resulting model shows wide-spread low velocity zone (Vs ≤ 3.4 km/s) in the mid-to-lower crust beneath northeastern Tibet Plateau, which may favor crustal ductile flow within the plateau. However, our model argues against the eastward crustal ductile flow beneath the Qinling belt from the Tibetan Plateau. We find high velocities in the middle part of Qinling belt which separate the low velocities in the mid-to-lower crust of the eastern Qinling belt from the low velocity zone in eastern Tibetan Plateau. More importantly, we observe significant low velocities and thickened lower crust at the Liupanshan thrust belt as the evidence for strong crustal shortening at this boundary between the northeastern Tibetan Plateau and Ordos block. The most important finding of our model is the upper mantle low velocity anomalies surrounding the Ordos block, particularly the one beneath the Trans North China Craton (TNCO) that is penetrating into the southern margin of the Ordos block for ∼100 km horizontally in the depth range of ∼70 km and at least 100 km. We propose an on-going lithospheric mantle reworking at the southernmost boundary of the Ordos block due to complicated mantle flow surrounding the Ordos block, that is, the eastward asthenospheric flow from the Tibet Plateau proposed by recent SKS study and mantle upwelling beneath the TNCO from mantle transition zone induced by the stagnant slabs of the subducted Pacific plate.

  15. Crustal structure of the late-Archean to Proterozoic Glenburgh Terrane in the Western Australian Craton: roles of a micro-continent in craton formation and reworking

    NASA Astrophysics Data System (ADS)

    Yuan, H.; Johnson, S.; Dentith, M. C.; Murdie, R.; Gessner, K.; Korhonen, F. J.; Bodin, T.

    2016-12-01

    The Capricorn Orogen records the Paleoproterozoic amalgamation of the Archean Pilbara and Yilgarn cratons to form the Western Australian Craton. Regional surveys involving geological mapping, geochemistry, and geophysics have revealed a prolonged tectonic history in craton assembly and subsequent intracratonic reworking, which have significantly re-shaped the orogenic crust. Augmenting the recent geophysical efforts to characterize the crustal architecture, a high-density passive-source seismic study has targeted the Glenburgh Terrane, an exotic late-Archean to Paleoproterozoic crustal element which differs structurally and isotopically from the surrounding Archean units. New seismic results show prominent signals of the Moho and intracrustal discontinuities, replicating the overall trend and depth range in the previous high-resolution deep crustal reflection image. The Terrane is imaged as a distinct felsic block which is consistent with a small Vp/Vs ratio ( 1.70) and a slow velocity mid- to lower crust. Available magnetotelluric measurements also indicate a resistive shallow and middle crust. At the margins the crust is thickened with a fast velocity lower crust, and changes to more intermediate to mafic composition, which may be related to paleo-subduction and terrane collision that initiated the assembly of the Western Australian Craton. These results confirm that the Glenburgh Terrane is a compositionally distinct micro continent formed in the Archean. Isotope studies have shown that significant post-cratonization magmatism differentiated the crust, which may account for the slow velocity mid-crust and fast shallow crustal layer that correlate with the voluminous granite batholiths in the region. Our results illustrate that multi-disciplinary datasets bring complementary resolution and therefore may put tighter constraints on the tectonic processes that have affected the crust.

  16. Hybrid Microcircuit Rework Procedures Evaluation.

    DTIC Science & Technology

    1980-08-01

    collect. Careful selection of materials and process control can reduce the work stage tempera- tures to 200°C or less; actual work stage temperatures are...ULTRASONIC DIE BONDELNON-DEST WRUCIV IOD - WIRE BOND CLEAN CURE SEMICONODUCTOR ETICA WIRE BOND V SEMICONDUCTOR SUBSTRATE ADHESIVE CHIPS TO TTI N I CHIPS...data were normalized to reflect the actual number of hybrids produced. The percentages of travelers examined varied from 5 to 50 percent of the total

  17. Integrated Nd isotopic and U-Pb detrital zircon systematics of clastic sedimentary rocks from the Slave Province, Canada: evidence for extensive crustal reworking in the early- to mid-Archean

    NASA Astrophysics Data System (ADS)

    Yamashita, Katsuyuki; Creaser, Robert A.; Villeneuve, Mike E.

    2000-01-01

    A combined U-Pb geochronology and Nd isotopic analysis of clastic metasedimentary rocks from the Archean Slave Province, Northwest Territories, Canada is presented. A series of clastic sedimentary rocks with deposition age of ˜3.13 Ga to ˜2.58 Ga was collected from the west-central Slave Province. These samples include conglomerates as well as finer sedimentary rocks such as greywacke, arkose and quartzite. Although it is generally agreed that the Nd model age ( TDM) of clastic sedimentary rocks represents the average sedimentary provenance age, TDM of samples studied here is generally older than the average U-Pb age of detrital zircons extracted from the same sample. Rather, there seems to be a better ˜1:1 relationship between the TDM and U-Pb age of the oldest zircon from each sample. A simple model relationship between U-Pb geochronology and TDM suggests that such correlation is a result of Archean crustal evolution of the Slave Province being dominated by crustal reworking (i.e. intracrustal processes) rather than addition of juvenile materials from the mantle. One exception is the period between ˜3.1 and ˜3.2 Ga, during which period a significant portion of detrital zircons have U-Pb ages exceeding the TDM, indicating a large input of juvenile material and/or decreasing level of crustal reworking. An alternative explanation for the U-Pb vs. TDM trend may be a mixing of older mafic juvenile crust (containing no zircon) and younger felsic juvenile crust. However, the general lack of extensive pre-2.8 Ga mafic crust in the Slave Province makes this scenario unlikely. The results of this study cannot constrain the change in the volume of continental crust at any given period of time, since the addition of juvenile crust may always be counterbalanced by recycling of crustal material back into the mantle. However, a dominance of crustal reworking during the early- to mid-Archean strongly implies that a large part of ancient crust was lost during the younger

  18. Crustal reworking during a long-lived magma pulse: 11 m.y. isotopic record from the Aucanquilcha Volcanic Cluster, central Andes

    NASA Astrophysics Data System (ADS)

    Walker, B. A.; Grunder, A.

    2010-12-01

    likely results from the tapping of these two different (and probably stacked) crustal Pb reservoirs. Trends in the Sr and Nd (and to a lesser extent, O) isotopic ratios suggest an increase in the crustal influence (or changing crustal source) with progressive magmatism at the AVC. Increasing Dy/Yb and Sm/Yb (MREE/HREE) ratios through time indicate an increasing role of garnet in the residuum of crustal melting, suggesting an increasing crustal thickness with time. Despite the overall trend toward more crustally contaminated compositions through time, there is a focusing of the isotopic values (at ~low Sr and ~high Nd) during the eruptive flare-up from ~5-2.5 Ma. During this time of high mantle flux, the crustal isotopic signature is likely being diluted in the lavas by mantle components. As the influx from the mantle wanes, the crustal signature becomes more pronounced with successive eruptions. In this sense, the balance between mantle power and thermal maturity of the crust, in addition to crustal character, bears heavily on the compositions of the lavas and the reworked arc crust.

  19. Metamorphic and age constraints on tectono-thermal reworking in the western H.U. Sverdrupfjella: A new crustal evolution model for Western Dronning Maud Land, Antarctica

    NASA Astrophysics Data System (ADS)

    Grosch, Eugene; Frimmel, Hartwig; Abu-Alam, Tamer; Košler, Jan

    2014-05-01

    -African thrust, which was subsequently reactivated during Gondwana break-up. These new results are integrated with published regional age (e.g. Frimmel, 2004) and geochemical (Grosch et al., 2007) data to propose a new geodynamic evolution model for Western Dronning Maud Land, with implications for Rodinia and Gondwana reconstructions. The revised Mesoproterozoic to Pan-African crustal evolution model for western Dronning Maud Land, proposes that the Maud Belt initially formed as a continental volcanic arc on the southeastern Grunehogna Craton margin, and not as an independent, Mesoproterozoic juvenile oceanic island arc. It follows that the PJD does not represent a Mesoproterozoic suture zone between a juvenile island arc and the Grunehogna Craton, but more likely a continental, Mesoproterozoic-Pan-African back-arc thrust zone. It is proposed herein, that large parts of the southeastern Kalahari-Grunehogna Craton margin (that included the Maud continental volcanic arc crust), experienced major tectonic reworking at eclogite to upper amphibolite facies conditions during Gondwana assembly. As such the new data from Western Dronning Maud Land has important implications for the extension of the Mozambique Belt into Antarctica and the location of the main suture zone between East and West Gondwana.

  20. Late Carboniferous to early Permian partial melting of the metasedimentary rocks and crustal reworking in the Central Asian Orogenic Belt: Evidence from garnet-bearing rhyolites in the Chinese South Tianshan

    NASA Astrophysics Data System (ADS)

    Cheng, Zhiguo; Zhang, Zhaochong; Santosh, M.; Zhao, Zhenyu; Chen, Lili

    2017-06-01

    Peraluminous granitic rocks provide important insights on crustal reworking processes. Here we study the garnet-bearing rhyolites of the Early Permian Xiaotikanlike Formation exposed in the Heiyingshan region located in the South Tianshan region in Xinjiang, NW China. Two layers of garnet-bearing rhyolites were recognized, which discordantly overlie the strongly deformed Late Carboniferous strata. The rocks generally display porphyritic texture with alkali-feldspar, quartz, plagioclase, biotite and garnet as the major phenocryst phases. Zircon LA-ICP-MS U-Pb analyses yield ages of 281.5 ± 0.7 Ma for the upper layer of rhyolite (ULR) and 299.9 ± 1.9 Ma for the lower layer (LLR). The ULR shows SiO2 in narrow range of 71.08 to 72.39 wt.%, and Fe2O3 from 0.99 to 1.69 wt.% with Fe2O3/FeO ranging from 1.68 to 2.68. The normalized trace element patterns are characterized by prominent troughs for Nb, Ta, Sr, P and Ti and relatively sloping rare earth element patterns. They have radioactive Sr-Nd isotopic compositions [(87Sr/86Sr)i = 0.7128 to 0.7179 and εNd = - 13.09 to - 12.44] and negative εHf(t) values of - 9.97 to - 1.27. The LLR exhibits similar trace and rare earth element patterns, εNd (- 12.68 to - 11.70) and εHf(t) values (- 7.56 to - 2.6) to the ULR, but have higher (87Sr/86Sr)i = 0.7166-0.7269 and lower Fe2O3/FeO ratios (0.17-1.73). Geochemical and isotopic characteristics indicate that these rhyolites are dominantly alkali-calcic and strongly peraluminous, which were most likely derived from muscovite dehydration melting of metagreywacke. We correlate this with the tectonic processes following the collision between the Central Tianshan-Yili Block and the Tarim Craton. Both the Zr saturation temperatures and Al2O3/TiO2 ratios suggest an increase in temperature of the source during 300 Ma to 280 Ma, which may be attributed to heat input from the underplating of mantle-derived basaltic magmas. The field relation between the rhyolite and the Late

  1. Archaean and Palaeoproterozoic gneisses reworked during a Neoproterozoic (Pan-African) high-grade event in the Mozambique belt of East Africa: Structural relationships and zircon ages from the Kidatu area, central Tanzania

    NASA Astrophysics Data System (ADS)

    Vogt, M.; Kröner, A.; Poller, U.; Sommer, H.; Muhongo, S.; Wingate, M. T. D.

    2006-06-01

    crustal remnants that were reworked during the Neoproterozoic Pan-African orogeny.

  2. 7 CFR 29.3542 - Rework.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... INSPECTION Standards Official Standard Grades for Dark Air-Cured Tobacco (u.s. Types 35, 36, 37 and Foreign... separated by sorting; (b) Tobacco which contains an abnormally large quantity of foreign matter or an...

  3. 7 CFR 29.3542 - Rework.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... INSPECTION Standards Official Standard Grades for Dark Air-Cured Tobacco (u.s. Types 35, 36, 37 and Foreign... separated by sorting; (b) Tobacco which contains an abnormally large quantity of foreign matter or an...

  4. 7 CFR 29.3542 - Rework.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... INSPECTION Standards Official Standard Grades for Dark Air-Cured Tobacco (u.s. Types 35, 36, 37 and Foreign... separated by sorting; (b) Tobacco which contains an abnormally large quantity of foreign matter or an...

  5. 7 CFR 29.3542 - Rework.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... INSPECTION Standards Official Standard Grades for Dark Air-Cured Tobacco (u.s. Types 35, 36, 37 and Foreign... separated by sorting; (b) Tobacco which contains an abnormally large quantity of foreign matter or an...

  6. Robust, Rework-able Thermal Electronic Packaging: Applications in High Power TR Modules for Space

    NASA Technical Reports Server (NTRS)

    Hoffman, James Patrick; Del Castillo, Linda; Hunter, Don; Miller, Jennifer

    2012-01-01

    The higher output power densities required of modern radar architectures, such as the proposed DESDynI [Deformation, Ecosystem Structure, and Dynamics of Ice] SAR [Synthetic Aperture Radar] Instrument (or DSI) require increasingly dense high power electronics. To enable these higher power densities, while maintaining or even improving hardware reliability, requires improvements in integrating advanced thermal packaging technologies into radar transmit/receive (TR) modules. New materials and techniques have been studied and are now being implemented side-by-side with more standard technology typically used in flight hardware.

  7. Robust, Rework-able Thermal Electronic Packaging: Applications in High Power TR Modules for Space

    NASA Technical Reports Server (NTRS)

    Hoffman, James Patrick; Del Castillo, Linda; Hunter, Don; Miller, Jennifer

    2012-01-01

    The higher output power densities required of modern radar architectures, such as the proposed DESDynI [Deformation, Ecosystem Structure, and Dynamics of Ice] SAR [Synthetic Aperture Radar] Instrument (or DSI) require increasingly dense high power electronics. To enable these higher power densities, while maintaining or even improving hardware reliability, requires improvements in integrating advanced thermal packaging technologies into radar transmit/receive (TR) modules. New materials and techniques have been studied and are now being implemented side-by-side with more standard technology typically used in flight hardware.

  8. Reworking Industrial Models, Exploring Contemporary Ideas, and Fostering Teacher Leadership

    ERIC Educational Resources Information Center

    Steel, Christopher; Craig, Elizabeth

    2006-01-01

    If the culture of teaching is to change from one of isolation and professional limitations to one of collaboration and empowerment, administrators must change how they view and interact with teachers. Mr. Steel and Ms. Craig offer specific recommendations for how school leaders can support and facilitate teachers' growth. (Contains 9 endnotes.)

  9. Lesson Plans Are Being Reworked To Stretch Construction Dollars.

    ERIC Educational Resources Information Center

    Rubin, Debra K.; Rosta, Paul; Gonchar, Joann; Illia, Tony

    2002-01-01

    Discusses the search by school systems and construction professionals for new efficiencies in the face of economic pressures. Some are shrinking or stretching out construction programs and demanding better economies. Others are seeking new financial partners and non-traditional funding methods, or deciding that creating new school space does not…

  10. Archean evolution of the Leo Rise and its Eburnean reworking

    NASA Astrophysics Data System (ADS)

    Thiéblemont, Denis; Goujou, Jean Christian; Egal, Emmanuel; Cocherie, Alain; Delor, Claude; Lafon, Jean Michel; Fanning, C. Mark

    2004-06-01

    Recent geological mapping in southeastern Guinea, supported by zircon dating, has called into question traditional understanding concerning the evolution of the Leo Rise. Gneiss dated at about 3540 Ma appears to constitute the earliest evidence for continental accretion within the Leo Rise. The existence of a Leonian depositional cycle at about 3000 Ma is confirmed, marked by volcanic and sedimentary rocks that can be correlated with the Loko Group in Sierra Leone. The span of ages (3244-3050 Ma) suggests that the Leonian cycle comprises different episodes whose respective chronology is as yet uncertain. Clearly distinct from the Leonian cycle, the Liberian cycle (˜2900-2800 Ma) is represented in Guinea by granite and migmatite (˜2910-2800 Ma), reflecting remobilization of the ancient Archean basement and deformation of the Leonian rocks; no deposition is associated with this cycle. After the Liberian, the Nimba and Simandou successions, containing Liberian detrital zircons, are assigned to the Birimian (˜2200-2000 Ma). Finally, Eburnean tectonism caused intense deformation of the Archean craton, accompanied by high-grade metamorphism and the intrusion of granite and syenite with ages between 2080 and 2020 Ma. The evolution of the Kénéma-Man domain, attributed to the cumulated effect of the Leonian and Liberian cycles, is thus in part Eburnean. We can suppose, therefore, that the NNE-SSW-trending structures attributed to the Liberian in Sierra Leone are, in fact, Eburnean. The Kambui Supergroup, also affected by this tectonism, should thus be assigned to the Birimian rather than the Liberian, which would explain its similarities with the Nimba and Simandou successions.

  11. Reworking Industrial Models, Exploring Contemporary Ideas, and Fostering Teacher Leadership

    ERIC Educational Resources Information Center

    Steel, Christopher; Craig, Elizabeth

    2006-01-01

    If the culture of teaching is to change from one of isolation and professional limitations to one of collaboration and empowerment, administrators must change how they view and interact with teachers. Mr. Steel and Ms. Craig offer specific recommendations for how school leaders can support and facilitate teachers' growth. (Contains 9 endnotes.)

  12. Hospital employs TQM principles to rework its evaluation system.

    PubMed

    Burda, D

    1992-02-24

    One Kansas hospital has taken the traditional employee evaluation process--with all its performance criteria, point systems and rankings--and turned it on its head. The new system employs total quality management principles and promotes personal development, education and teamwork. And everyone gets the same raise.

  13. The effect of rainfall events with changing frequency and magnitude on reworking conditions of proglacial moraines

    NASA Astrophysics Data System (ADS)

    Dusik, Jana-Marie; Heckmann, Tobias; Neugirg, Fabian; Hilger, Ludwig; Haas, Florian; Becht, Michael

    2014-05-01

    The consequences of the ongoing temperature rise in alpine regions force glaciers to rapid melting and thus new surfaces are exposed to generate numerous geomorphic processes. Steep Little Ice Age (LIA) moraines and other glacial depositional landforms contain huge masses of sediments, that are subject to progressive (re-)mobilization by gullying, slope wash, debris flows and other mass movements. The material is frequently re-deposited in secondary storage landforms; these storages themselves are then subject to depletion. Increased morphodynamics with a maximum shortly after deglaciation, and a slow decrease afterwards, are predicted by the conceptual model of paraglacial response. In addition to these "self-organising" changes following deglaciation, our study area has been experiencing changes in precipitation and (meltwater) discharge for decades; these climatic factors are known to influence morphodynamics, e.g. by triggering mass movements and by driving slope wash and fluvial erosion. While overall precipitation appears to decrease, heavy rainfall events become more intense, and discharge rates of glacial melt water channels show a significant increase. The PROSA joint project (High-resolution measurements of morphodynamics in rapidly changing PROglacial Systems of the Alps) uses terrestrial and airborne LiDAR data and digital Photogrammetry to monitor surface changes in the Upper Kaunertal, Austrian Central Alps (64 km²). These are related to the deglaciation since the end of the LIA and to changes in hydrometeorological parameters since several decades ago. The aim of this study is to investigate a possible relationship between climate change signals and erosion rates in the proglacial area of the Gepatschferner. The morphodynamics of steep LIA moraines are assessed on multiple temporal scales: Long-term changes are analyzed based on multitemporal airborne images dating back to 1953. The recent development is measured using digital elevation models (DEM) generated from multitemporal airborne (2006, July 2012, September 2012) and terrestrial (July 2010, August 2010, September 2011, July 2012, September 2012) LiDAR surveys. Seasonal climate data of more than 40 years are analyzed to detect trends. Precipitation and discharge data of two extreme events in 2011 and 2012 that triggered slope-type debris flows are examined in detail. The moved sediment masses are quantified and related to the precipitation record.

  14. Reworking or Reaffirming Practice? Perceptions of Professional Learning in Alternative and Flexible Education Settings

    ERIC Educational Resources Information Center

    Plows, Vicky

    2017-01-01

    The success of alternative and flexible education settings, serving young people for whom mainstream schooling has not worked well, rests on the practices of their staff. This paper explores interview and survey data on the professional learning experiences and perceptions of staff working in flexible learning programmes across Victoria,…

  15. Bacterial reworking of terrigenous and marine organic matter in estuarine water columns and sediments

    NASA Astrophysics Data System (ADS)

    Bourgoin, Luc-Henri; Tremblay, Luc

    2010-10-01

    Amino acids and the bacterial biomarkers muramic acid and D-amino acids were quantified in the ultrafiltered dissolved, particulate and sedimentary organic matter (UDOM, POM and SOM) of the St. Lawrence system (Canada). The main objectives were to better describe the fate of terrigenous and marine organic matter (OM) in coastal zones and to quantify the bacterial contributions to OM composition and diagenesis. Regardless of their origin, the carbon (C) content of the particles substantially decreased with depth, especially near the water-sediment interface. Major diagenetic transformations of organic nitrogen (N) were revealed and important differences were observed between terrigenous and marine OM. Amino acid contents of particles decreased by 66-93% with depth and accounted for 12-30% of the particulate C losses in marine locations. These percentages were respectively 18-56% and 7-11% in the Saguenay Fjord where terrigenous input is important. A preferential removal of particulate N and amino acids with depth or during transport was measured, but only in marine locations and for N-rich particles. This leads to very low amino acid yields in deep marine POM. However, these yields then increased to a level up to three times higher after deposition on sediments, where SOM showed lower C:N ratios than deep POM. The associated increase of bacterial biomarker yields suggests an active in situ resynthesis of amino acids by benthic bacteria. The N content of the substrate most likely determines whether a preferential degradation or an enrichment of N and amino acid are observed. For N-poor OM, such as terrigenous or deep marine POM, the incorporation of exogenous N by attached bacteria can be measured, while the organic N is preferentially used or degraded in N-rich OM. Compared to the POM from the same water samples, the extracted UDOM was poor in N and amino acids and appeared to be mostly made of altered plant and bacterial fragments. Signs of in situ marine production of UDOM were observed in the most marine location. The POM entering the St. Lawrence Upper Estuary and the Saguenay Fjord appeared made of relatively fresh vascular plant OM mixed with highly altered bacterial debris from soils. In contrast, the POM samples from the more marine sites appeared mostly made of fresh planktonic and bacterial OM, although they were rapidly degraded during sinking. Based on biomarker yields, bacterial OM represented on average ˜20% of bulk C and approximately 40-70% of bulk N in POM and SOM, with the exception of deep marine POM exhibiting approximately two times lower bacterial contributions.

  16. The Volumetric Impact of Biogenic Sediment Reworking on the Geomorphology and Shallow Stratigraphy of Barrier Islands

    NASA Astrophysics Data System (ADS)

    Grimes, Z. T.; Buynevich, I. V.; Darrow, J. S.; Seminack, C. T.; Griffis, N.

    2010-12-01

    In addition to physical processes operating along the dynamic, sand-dominated coastal landforms, biogenic activity affects their unconsolidated surfaces in a variety of ways, displacing large volumes of sediment and partially modifying their morphological elements. This is particularly well pronounced on isolated coastal landforms, such as several barrier islands along the U.S. Mid-Atlantic Coast and Sable Island (Canada), where populations of native and introduced organisms have a confined range of activity. Diverse communities of vertebrates (ungulates, carnivores, wading birds, and reptiles) produce well-pronounced trails (trampled areas) or extend into regions of mobile fine-to-coarse sand. Large ungulates, such as horses, deer, and wild boar not only leave deep hoofprint structures in sand (1-5 cm, depending on substrate properties), but can easily penetrate and dislocate substantial portions of thin soil horizons. For example, beyond their grazing impact on vegetation, several hundred feral horses on Assateague Island (Maryland-Virginia, USA) disturb sections of beach, dune, and shallow saltmarsh through compaction and displacement of surface sediment. Given hoofprint diameters of 8-12 cm, partial track and trackway overlap, and an uninterrupted activity period of only 1 hour/day, anywhere from 100 to more than 1200 m3 of sand may be affected by this population on a daily basis. The compaction alters the geomechanical properties of the sediment, particularly along partially saturated intertidal areas. On steeply sloping dunes, which may be traversed numerous times by several individuals, grainflows are common, often leading to partial collapses of the dune slope. In addition to vertebrate trampling and burrowing (e.g., turtle nests), large invertebrates produce distinct bioturbation structures in the upper 0.5-1.0 m of barrier sands. A single ghost crab burrow in the backshore region may attain 4-5 cm in diameter, resulting in the removal and shifting of 3,500 cm3 of sand. Such biogenic structures not only affect the primary physical formations along beach, dune, and washover sequences, but also create interference patterns on high-resolution geophysical images. Due to a dielectric contrast between air-filled cavities (~1) and the surrounding sediment (~5-30), such techniques as ground-penetrating radar are being increasingly applied to identify and map biogenic structures in order to assess the impact of the biota on substrate integrity and slope stability in terrestrial and coastal settings.

  17. It's time to Rework the Blueprints: Building a Science for Clinical Psychology

    ERIC Educational Resources Information Center

    Millon, Theodore

    2003-01-01

    The aims in this article are to connect the conceptual structure of clinical psychological science to what the author believes to be the omnipresent principles of evolution, use the evolutionary model to create a deductively derived clinical theory and taxonomy, link the theory and taxonomy to comprehensive and integrated approaches to assessment,…

  18. The "Rebbe" Reworked: An Inquiry into the Persistence of Inherited Traditions of Teaching.

    ERIC Educational Resources Information Center

    Pomson, Alex

    2002-01-01

    Examines the strength of teaching archetypes, highlighting accounts from Jewish day school teachers about their lives and work to investigate the strength of traditional conceptions of teaching. Results illustrate how a teacher draws on a strong tradition of Jewish teaching even as she transforms her enactment of that tradition to accommodate new…

  19. Decentring poverty, reworking government: social movements and states in the government of poverty.

    PubMed

    Bebbington, A J; Mitlin, D; Mogaladi, J; Scurrah, M; Bielich, C

    2010-01-01

    The significance of social movements for pro-poor political and social change is widely acknowledged. Poverty reduction has assumed increasing significance within development debates, discourses and programmes - how do social movement leaders and activists respond? This paper explores this question through the mapping of social movement organisations in Peru and South Africa. We conclude that for movement activists 'poverty' is rarely a central concern. Instead, they represent their actions as challenging injustice, inequality and/or development models with which they disagree, and reject the simplifying and sectoral orientation of poverty reduction interventions. In today's engagement with the poverty-reducing state, their challenge is to secure resources and influence without becoming themselves subject to, or even the subjects of, the practices of government.

  20. The Ages of Consent: Re-Working Consensual Frameworks in Postmodern Times

    ERIC Educational Resources Information Center

    Loveridge, Judith; Cornforth, Sue

    2014-01-01

    The processes of gaining consent for educational and social research with children and young people have become increasingly complex. A variety of influences contribute to this complexity. In this paper, we use post-structural concepts to focus on the influence of three co-existing and interweaving perspectives: protectionist, participatory and…

  1. Recent research on the Chesapeake Bay impact structure, USA - Impact debris and reworked ejecta

    USGS Publications Warehouse

    Horton, J.W.; Aleinikoff, J.N.; Kunk, M.J.; Gohn, G.S.; Edwards, L.E.; ,; Powars, D.S.; Izett, G.A.

    2005-01-01

    Four new coreholes in the western annular trough of the buried, late Eocene Chesapeake Bay impact structure provide samples of shocked minerals, cataclastic rocks, possible impact melt, mixed sediments, and damaged microfossils. Parautochthonous Cretaceous sediments show an upward increase in collapse, sand fluidization, and mixed sediment injections. These impact-modifi ed sediments are scoured and covered by the upper Eocene Exmore beds, which consist of highly mixed Cretaceous to Eocene sediment clasts and minor crystalline-rock clasts in a muddy quartz-glauconite sand matrix. The Exmore beds are interpreted as seawater-resurge debris flows. Shocked quartz is found as sparse grains and in rock fragments at all four sites in the Exmore, where these fallback remnants are mixed into the resurge deposit. Crystalline-rock clasts that exhibit shocked quartz or cataclastic fabrics include felsites, granitoids, and other plutonic rocks. Felsite from a monomict cataclasite boulder has a sensitive high-resolution ion microprobe U-Pb zircon age of 613 ?? 4 Ma. Leucogranite from a polymict cataclasite boulder has a similar Neoproterozoic age based on muscovite 40Ar/39Ar data. Potassium-feldspar 40Ar/39Ar ages from this leucogranite show cooling through closure (???150 ??C) at ca. 261 Ma without discernible impact heating. Spherulitic felsite is under investigation as a possible impact melt. Types of crystalline clasts, and exotic sediment clasts and grains, in the Exmore vary according to location, which suggests different provenances across the structure. Fractured calcareous nannofossils and fused, bubbled, and curled dinofl agellate cysts coexist with shocked quartz in the Exmore, and this damage may record conditions of heat, pressure, and abrasion due to impact in a shallow-marine environment. ?? 2005 Geological Society of America.

  2. E3 Success Story -Reducing Rework With the Lean and Green Advantage: Metal Finishing Technologies, Inc

    EPA Pesticide Factsheets

    Green Suppliers Network representatives Judy Wlodarczyk and Bill Caplan, of CONNSTEP, Inc., trained the MFT review team, and together they completed current and future state value stream maps for the zinc plating line.

  3. Implications of (reworked) aeolian sediments and paleosols for Holocene environmental change in Western Mongolia

    NASA Astrophysics Data System (ADS)

    Klinge, Michael; Lehmkuhl, Frank; Schulte, Philipp; Hülle, Daniela; Nottebaum, Veit

    2017-09-01

    In the semi-arid to semi-humid regions of western Mongolia four different geomorphological aeolian and fluvial archives were investigated in order to gain environmental information of landscape evolution during the late glacial and the Holocene. These archives, which contain aeolian deposits, fluvial sediments, and paleosols, are situated upon glacial moraines, fluvial terraces, floodplains, or mountain slopes. While radiometric dating provides information about the age of the sediment and paleosols, grain size and element distribution provide information about the sediment source and soil development. Extensive aeolian sediment transport occurred from 17 to 10 ka during the late glacial when climate was cold and dry. Since that period the developing steppe and alpine meadow vegetation served as a dust trap. During the warm and wet early to mid-Holocene sediment transport was reduced under a dense vegetation cover. All paleosols of the investigated archives show late Holocene ages which point to an environmental turning point around 3 ka. Since then, the Neoglacial period started with cooler climate conditions and periglacial processes intensified again. Recognizable glacier advances occurred during the Little Ice Age several centuries ago. Since then, global climate change leads to warmer and more arid conditions. During the late Holocene, a new period of strong geomorphological activity started and huge quantities of aeolian, colluvial and fluvial sediment accumulated. These intensified soil relocation processes cannot be explained exclusively by climate change because there are no explicit indications found in the palynological and lacustrine records of Mongolia. This discrepancy suggests that the additional factor of human impact has to be considered, which amplified the climate signal on the landscape. Simultaneously, when the enhanced geomorphological processes occurred, the prehistoric people changed from hunting and gathering to livestock husbandry. A first extensive population growth of the Scythian nomadic tribes is documented for the beginning of the Bronze Age in Central Asia. This temporal concurrence supports the finding of a first extensive human impact on landscape development.

  4. Reworking of School Principals' Roles in the Context of Educational Privatization: A View from Ukraine

    ERIC Educational Resources Information Center

    Kovalchuk, Serhiy; Shchudlo, Svitlana

    2014-01-01

    Educational privatization created new arrangements for funding, provision, and regulation of educational systems and their various stakeholders worldwide. This qualitative study examines the driving forces of privatization in the public education of Ukraine, focusing specifically on the professional roles of school principals who have been…

  5. Ancient impactor components preserved and reworked in martian regolith breccia Northwest Africa 7034

    NASA Astrophysics Data System (ADS)

    Goderis, Steven; Brandon, Alan D.; Mayer, Bernhard; Humayun, Munir

    2016-10-01

    Northwest Africa (NWA) 7034 and paired stones represent unique samples of martian polymict regolith breccia. Multiple breccia subsamples characterized in this work confirm highly siderophile element (HSE: Re, Os, Ir, Ru, Pt, Pd) contents that are consistently elevated (e.g., Os ∼9.3-18.4 ppb) above indigenous martian igneous rocks (mostly <5 ppb Os), equivalent to ∼3 wt% of admixed CI-type carbonaceous chondritic material, and occur in broadly chondrite-relative proportions. However, a protracted history of impactor component (metal and sulfide) breakdown and redistribution of the associated HSE has masked the original nature of the admixed meteorite signatures. The present-day 187Os/188Os ratios of 0.119-0.136 record a wider variation than observed for all major chondrite types. Combined with the measured 187Re/188Os ratios of 0.154-0.994, the range in Os isotope ratios indicates redistribution of Re and Os from originally chondritic components early in the history of the regolith commencing at ∼4.4 Ga. Superimposed recent Re mobility reflects exposure and weathering at or near the martian and terrestrial surfaces. Elevated Os concentrations (38.0 and 92.6 ppb Os), superchondritic Os/HSE ratios, and 187Os/188Os of 0.1171 and 0.1197 measured for two subsamples of the breccia suggest the redistribution of impactor material at ∼1.5-1.9 Ga, possibly overlapping with a (partial) resetting event at ∼1.4 Ga recorded by U-Pb isotope systematics in the breccia. Martian alteration of the originally chondritic HSE host phases, to form Os-Ir-rich nuggets and Ni-rich pyrite, implies the influence of potentially impact-driven hydrothermal systems. Multiple generations of impactor component admixture, redistribution, and alteration mark the formation and evolution of the martian regolith clasts and matrix of NWA 7034 and paired meteorites, from the pre-Noachian until impact ejection to Earth.

  6. Reworking of School Principals' Roles in the Context of Educational Privatization: A View from Ukraine

    ERIC Educational Resources Information Center

    Kovalchuk, Serhiy; Shchudlo, Svitlana

    2014-01-01

    Educational privatization created new arrangements for funding, provision, and regulation of educational systems and their various stakeholders worldwide. This qualitative study examines the driving forces of privatization in the public education of Ukraine, focusing specifically on the professional roles of school principals who have been…

  7. Managing Spaces: (Re)working Relations of Strategy and Spatiality in Vocational Education and Training

    ERIC Educational Resources Information Center

    Mulcahy, Dianne

    2007-01-01

    The adoption of a more "open" national training market in vocational education and training (VET) in Australia has led to considerable changes in VET organizations and considerable challenges for VET managers. Recent research has established the critical role that 'strategy' plays in leading and managing these organizations and the…

  8. Water as Rural Heritage: Reworking Modernity through Resource Conflict in Edwards County, Kansas

    ERIC Educational Resources Information Center

    Solis, Patricia

    2005-01-01

    Conflicts over changing uses of natural resources are familiar within communities of the Western US and are usually resolved through legal processes. This paper analyzes resource conflict through juxtaposing impact analyses often used in their juridical resolution with discourse analyses of affected rural communities. The purchase of property by a…

  9. Reworked old crust-derived shoshonitic magma: The Guarany pluton, Northeastern Brazil

    NASA Astrophysics Data System (ADS)

    Ferreira, Valderez P.; Sial, Alcides N.; Pimentel, Marcio M.; Armstrong, Richard; Guimarães, Ignez P.; da Silva Filho, Adejardo F.; de Lima, Mariucha Maria C.; da Silva, Thyego R.

    2015-09-01

    The 572 Ma Guarany stock consists of magmatic epidote-bearing hornblende monzodiorite to biotite granite that intruded Paleoproterozoic orthogneisses about 10 km inland from the coast in northeastern Brazil. Co-magmatic diorite enclaves and dikes are abundant throughout the pluton. The monzodiorite-granite pluton and diorite enclaves are shoshonitic and display continuous trends in variation diagrams. They display chemical and isotopic characteristics of crustal melts, such as enrichment in incompatible elements, high back-calculated initial 87Sr/86Sr ratios (avg. 0.71253), negative εNd (0.57Ga) values (avg. - 14.58), as well as high and variable (+ 9.1 to + 11.1‰VSMOW) δ18O (zircon) values. Correlations between O-isotope and whole-rock silica contents, as well as initial 87Sr/86Sr ratios with 1/Sr concentrations, suggest hybridization of a lower continental crustal melt with more felsic crustal rocks, concomitant with fractional crystallization. Amphibole chemistry and whole rock Zr, TiO2 and P2O5 contents suggest magma solidification at a pressure 7 kbar and near liquidus temperature 900 °C. The parental magma was likely formed by partial melting of old (tDM = 2.0 Ga) amphibolitic lower continental crustal rocks, in a post-collisional setting, probably triggered by underplating of mantle-derived mafic magma during the period of relaxation after collision.

  10. No Work Like Rework: Issues in the Design of a Math Test Sign-Up Application

    ERIC Educational Resources Information Center

    Alkadi, Ghassan; Beaubouef, Theresa

    2012-01-01

    This paper introduces a test sign-up application developed for a math department at a university. The requirements, design, and final software product are presented, along with one very important unexpected problem that arose after completion of the work--the system to be implemented and maintained by the client was not compatible with the…

  11. Norway`s development prospect list grows through old field reworkings and new finds

    SciTech Connect

    Knott, D.

    1998-08-17

    The list of Norwegian offshore fields under development or lined up for development has grown considerably in the last year. Wood Mackenzie Consultants Ltd., Edinburgh, says fields likely to be brought on stream in the next 5 years have total reserves of 6.4 billion bbl of oil and 25.7 tcf of gas. The analyst attributes growth in the developments list to several factors: development delays on current projects due to construction or technical problems; delays forced on operators by the Norwegian government; the award of a number of gas sales allocations by the GFU (Gas Negotiating Committee); the planned exploitation of older finds previously considered uncommercial for technical or logistical reasons; and the continuing normal progression of discoveries through to the development stage following a sustained period of successful exploration.

  12. It's time to rework the blueprints: building a science for clinical psychology.

    PubMed

    Millon, Theodore

    2003-11-01

    The aims in this article are to connect the conceptual structure of clinical psychological science to what the author believes to be the omnipresent principles of evolution, use the evolutionary model to create a deductively derived clinical theory and taxonomy, link the theory and taxonomy to comprehensive and integrated approaches to assessment, and outline a framework for an integrative synergistic model of psychotherapy. These foundations also provide a framework for a systematic approach to the subject realms of personology and psychopathology. Exploring nature's deep principles, the model revives the personologic concept christened by Henry Murray some 65 years ago; it also parallels the interface between human social functioning and evolutionary biology proposed by Edward Wilson in his concept of sociobiology.

  13. It's time to Rework the Blueprints: Building a Science for Clinical Psychology

    ERIC Educational Resources Information Center

    Millon, Theodore

    2003-01-01

    The aims in this article are to connect the conceptual structure of clinical psychological science to what the author believes to be the omnipresent principles of evolution, use the evolutionary model to create a deductively derived clinical theory and taxonomy, link the theory and taxonomy to comprehensive and integrated approaches to assessment,…

  14. Reworking the science curriculum: A case study in the interdependence between introductory biology and multiculturalism

    NASA Astrophysics Data System (ADS)

    Persell, Roger

    1994-12-01

    Multiculturalism has emerged as the major influence in revising science curricula and teaching, yet misunderstanding about the history and theoretical underpinnings of multiculturalism has made the separation of political and education reform contentious and difficult. Within the context of a new college-wide pluralism and diversity requirement, a large introductory biology course at Hunter College of the City University of New York is now the testing ground for an interdependent model of multicultural education. The implications for multiculturalism, science pedagogy, and the pivotal role of introductory courses are discussed.

  15. CEBAF energy upgrade program including re-work of CEBAF cavities

    SciTech Connect

    Joseph Preble

    2008-02-12

    The Thomas Jefferson National Accelerator Facility, Jefferson Lab, is planning an upgrade of the CEBAF accelerator from a maximum energy of 6 GeV to 12 GeV and from 3 to 4 experimental halls. This paper will discuss the plans for upgrading the energy of the machine which requires improvements of the existing Super Conducting Radio Frequency (SRF) cryomodules and the additions of ten newly designed high performance SRF cryomodules.

  16. The Ages of Consent: Re-Working Consensual Frameworks in Postmodern Times

    ERIC Educational Resources Information Center

    Loveridge, Judith; Cornforth, Sue

    2014-01-01

    The processes of gaining consent for educational and social research with children and young people have become increasingly complex. A variety of influences contribute to this complexity. In this paper, we use post-structural concepts to focus on the influence of three co-existing and interweaving perspectives: protectionist, participatory and…

  17. Reworking or Reaffirming Practice? Perceptions of Professional Learning in Alternative and Flexible Education Settings

    ERIC Educational Resources Information Center

    Plows, Vicky

    2017-01-01

    The success of alternative and flexible education settings, serving young people for whom mainstream schooling has not worked well, rests on the practices of their staff. This paper explores interview and survey data on the professional learning experiences and perceptions of staff working in flexible learning programmes across Victoria,…

  18. Managing Spaces: (Re)working Relations of Strategy and Spatiality in Vocational Education and Training

    ERIC Educational Resources Information Center

    Mulcahy, Dianne

    2007-01-01

    The adoption of a more "open" national training market in vocational education and training (VET) in Australia has led to considerable changes in VET organizations and considerable challenges for VET managers. Recent research has established the critical role that 'strategy' plays in leading and managing these organizations and the…

  19. Last millennium gravity reworking processes in the western Gulf of Corinth: correlations with historical seismicity and indication of earthquake clusters

    NASA Astrophysics Data System (ADS)

    Beckers, Arnaud; Beck, Christian; Hubert-Ferrari, Aurélia; Papatheodorou, George; Reyss, Jean-Louis

    2016-04-01

    The western tip of the Corinth Rift is considered as the most active within this major extensional structure, as evidenced by: seismicity, GPS kinematics, and INSAR data (Bernard et al., 2006). Within the frame of a multidisciplinary project dedicated to seismic hazards assessment for this region, two offshore surveys - high resolution seismic reflection and gravity coring - were conducted in this area. They were dedicated to the Late Quaternary sedimentary fill as the latter was expected to record both long term deformation (Beckers et al., 2015) and sedimentary "events" related to major earthquakes and/or tsunamis. Seismic reflection imaging displays the time and geographical distributions of large submarine landslides (MTDs) during the last 100 kyr. Based on a morpho-sedimentary map and the active fault pattern, up to 2 m-long cores were selected to detect and characterize the possible impact of historical events. The chronological control is based on AMS 14C dating and four detailed 210Pb and 137Cs profiles. Sedimentation (components, sources, transport and settling mechanisms) was analysed through textural, chemical, and mineralogical parameters. Turbidites could be clearly separated from the hemipelagic deposits. Our attempt to correlate identified sedimentary "events" with historical data greatly benefited from a recently elaborated catalog (Albini et al., 2014) with precisely re-located epicentral areas. Cable breaks were also taken into account. Attenuation models (Papazachos & Papaioannou's, 1997) were used to discuss paleo-intensities vs. distance form epicentral areas. From the whole set of cores, the following results may be underlined: - the correlations between cores from the different sites are not complete, including for a few neighbouring sites belonging to the same morpho-sedimentary unit; we relate these discrepancies to the complex bottom morphology and/or to bottom currents responsible for local erosion; - for several well-documented earthquakes and tsunamis, we could not find a clearly recorded sedimentary impact; - non earthquake-triggered MTDs (as the 1963 event) produced specific layers identical to the major earthquakes impacts. At the difference, for a few cores from the deep axial floor, several sandy or silty turbidites permit to establish correlations: i) between coring sites, ii) with earthquakes which stroke two different areas, respectively east and west of the concerned part of the Gulf. Furthermore, the sedimentary events show a particular time distribution for the last 600 yr: - two intervals with short recurrences: a recent one (~1900 AD-Present or ~1750 AD-Present) and an older one (~1550 AD-1700 AD or ~1450 AD-1800 AD); these time distributions differ from each coring site; - a long "quiet" period (150 to 200 yr). From these results, we tentatively consider this sedimentary record as an indicator of a migration of seismogenic faulting activity. Ref.: Albini, P., et al., 2014. Techn. Rep. I.N.G.V. Roma. Beckers, A., et al., 2015. Marine Geology, 360:55-69 Bernard, P., et al., 2006. Tectonophysics, 426:7-30. Papazachos, C., Papaioannou, C., 1997. Journal of Seismology, 1:181-201.

  20. The Triassic reworking of the Yunkai massif (South China): EMP monazite and U-Pb zircon geochronologic evidence

    NASA Astrophysics Data System (ADS)

    Chen, Cheng-Hong; Liu, Yung-Hsin; Lee, Chi-Yu; Sano, Yuji; Zhou, Han-Wen; Xiang, Hua; Takahata, Naoto

    2017-01-01

    Geohistory of the Yunkai massif in South China Block is important in understanding the geodynamics for the build-up of this block during the Phanerozoic orogenies. To investigate this massif, we conduct EMP monazite and U-Pb zircon geochronological determinations on mineral inclusions and separate for seventeen samples in four groups, representing metamorphic rocks from core domain, the Gaozhou Complex (amphibolite facies, NE-striking) and the Yunkai Group (greenschist facies, NW-striking) of this massif and adjacent undeformed granites. Some EMP monazite ages are consistent with the NanoSIMS results. Monazite inclusions, mostly with long axis parallel to the cleavage of platy and elongated hosts, give distinguishable age results for NW- and NE-trending deformations at 244-236 Ma and 236-233 Ma, respectively. They also yield ages of 233-230 Ma for core domain gneissic granites and 232-229 Ma for undefomed granites. Combining U-Pb zircon ages of the same group, 245 Ma and 230 Ma are suggested to constrain the time of two phases of deformation. Aside from ubiquity of Triassic ages in studied rocks, ages of detrital monazite in the meta-sandstone match the major U-Pb zircon age clusters of the metamorphic rock that are largely concentrated at Neoproterozoic (1.0-0.9 Ga) and Early Paleozoic (444-431 Ma). Based on these geochronological data, Triassic is interpreted as representing the time for recrystallization of these host minerals on the Early Paleozoic protolith, and the also popular Neoproterozoic age is probably inherited. With this context, Yunkai massif is regarded as a strongly reactivated Triassic metamorphic terrain on an Early Paleozoic basement which had incorporated sediments with Neoproterozoic provenances. Triassic tectonic evolution of the Yunkai massif is suggested to have been controlled by converging geodynamics of the South China and Indochina Blocks as well as mafic magma emplacement related to the Emeishan large igneous province (E-LIP).

  1. Simulation and Animation of the Cherry Point, North Carolina Naval Aviation Depot Proposed Engine Blade and Vane Rework Facility

    DTIC Science & Technology

    1988-11-10

    ins igqt tcl ths rspcins5*ib le fo-r the many dec isaions that need to be made in such an ur"Wirt akin A linI-ear ’pi g rrn i ing model had previously...been created and ,!S ni--- Lhe ing tor’I protvide detf rrmiin ist ic model inrg o-f the presen.. farcili ty. tiln interactive dat-a base. editor used...in conj unicti on wi th t ht- linear program leads the user through the crention of the data f iles required to run the LP models . B~uiliding upo~n th

  2. Investigation of Airborne Chemical Concentrations in Certain Work Areas of Naval Air Rework Facility at North Island, California

    DTIC Science & Technology

    1976-12-01

    and leading edge abrasive strips, etc. In the process of doing these jobs, it is necessary to strip and clean surfaces and to prepare them for...cyanide sump i3 another possible source of hydrogen cyanide. The possibility of "accidents" or human failure could lead to conditions where appreciable...termining concentrations of toxic gases and vapors. It has been proven through extensive use by leading industrial companies and government agencies

  3. Documentation and Evaluation of Depot Maintenance Cost Accumulation and Reporting at the Naval Air Rework Facility, Jacksonville, Florida.

    DTIC Science & Technology

    1984-06-01

    range of budgeting and accounting services including the formula- tion, presentation and execution of the NIF Operating Budget , Funding Budget and A-li... Budget (long-range, 3 year budget ), development of improved financial management systems for effective control of production and overhead costs and...personnel administration, includ- ing review of position classifications and descriptions, pro- viding advice and assistance in the development of

  4. Burning peat and reworking loess contribute to the formation and evolution of a large Carolina-bay basin

    NASA Astrophysics Data System (ADS)

    Rodriguez, Antonio B.; Waters, Matthew N.; Piehler, Michael F.

    2012-01-01

    Carolina bays are nearly ubiquitous along ~ 1300 km of the North American Atlantic Coastal Plain, but relatively few bays have been examined in detail, making their formation and evolution a topic of controversy. The Lake Mattamuskeet basin, eastern North Carolina, USA, is a conglomeration of multiple Carolina bays that form a > 162 km2 lake. The eastern shoreline of the lake is made up of a 2.9-km-wide plain of parabolic ridges that recorded rapid shoreface progradation. The lower shoreface deposit contains abundant charcoal beds and laminae dated 6465-6863 cal yr BP, corresponding with initiation of a lacustrine environment in the eastern part of the lake. A core from the western part of the lake sampled a 1541-1633 cal yr BP charcoal bed at the base of the lacustrine unit, indicating formation of this part of the basin postdates the eastern basin. Lake Mattamuskeet has no relationship to the Younger Dryas or a linked impact event because rim accretion significantly postdates 12,000 cal yr BP. The shoreline progradation, and association of charcoal beds with the oldest lake sediment in both main parts of the basin, suggest that fire and subsequent hydrodynamic processes were associated with initial formation of these Carolina bays.

  5. Half a billion years of reworking of Hadean mafic crust to produce the Nuvvuagittuq Eoarchean felsic crust

    NASA Astrophysics Data System (ADS)

    O'Neil, Jonathan; Boyet, Maud; Carlson, Richard W.; Paquette, Jean-Louis

    2013-10-01

    The Nuvvuagittuq greenstone belt is dominated by mafic rocks, called the Ujaraaluk unit, that are mostly composed of cummingtonite-plagioclase-biotite with variable amounts of garnet. While the oldest zircons contained in thin intrusive trondhjemitic bands are ∼3.8 Ga, 146Sm-142Nd systematics suggest that the Ujaraaluk unit is as old as 4.4 Ga. The Nuvvuagittuq greenstone belt is surrounded by Eoarchean TTGs that have geochemical and isotopic compositions consistent with their derivation by partial melting of a source similar in composition and age to the Ujaraaluk unit. New zircon dates reported here show the Nuvvuagittuq TTGs to consist at least of four distinct age units of 3.76 Ga, 3.66 Ga, 3.5-3.4 Ga and 3.35 Ga. The Hf isotopic compositions of zircons from the TTG are consistent with derivation from Hadean mafic crust. The 3.66 Ga to 3.35 Ga TTGs appear to have been formed primarily from melting of a source compositionally similar to the 4.4 Ga Ujaraaluk unit, whereas the more radiogenic Hf of the zircons from the 3.76 Ga TTGs may suggest derivation from melting of a source compositionally similar to 4.1 Ga intrusive gabbros. Alternatively, the distinct rare earth element patterns of the 3.76 Ga and 3.66 Ga TTGs suggest their derivation from sources with variable amounts of residual garnet and hence formation at different depths. The composition of the older TTGs is indicative of a deeper source that may have involved a greater interaction between the melt and the mantle to explain the more radiogenic Hf isotopic compositions of their zircons. Sources compositionally similar to the Ujaraaluk unit and intrusive gabbros appear to be the most likely candidates for the Hadean precursor of the Nuvvuagittuq TTGs.

  6. Retracted: Using genetic algorithm approach to solve a multi-product EPQ model with defective items, rework, and constrained space

    NASA Astrophysics Data System (ADS)

    Hafshejani, Kiamars Fathi; Valmohammadi, Changiz; Khakpoor, Alireza

    2012-12-01

    The Economic Production Quantity (EPQ) model is often used in the manufacturing sector to assist firms in determining the optimal production lot size that minimizes overall production-inventory costs. There are some assumptions in the EPQ model that restrict this model for real-world applications. Some of these assumptions are (1) infinite space of warehouse, (2) all of the produced items are perfect, and (3) only one type of goods is produced. In this paper, we develop the EPQ model by assuming that each produced lot contains some imperfect items and scraps. In addition, we have more than one kind of products along with warehouse space limitations. Under these conditions, we formulate the problem as a non-linear programming model and propose a genetic algorithm to solve it. At the end, we present a numerical example to illustrate the applications of the proposed methodology and identify the optimal value of the parameters of the genetic algorithm.

  7. A Parametric Analysis of Three Models for Direct Delivery by a Naval Supply Center to a Naval Air Rework Facility.

    DTIC Science & Technology

    1981-03-01

    L-c ! nez r :a ::e ti44 Assccia~te -ro N3 b .J-I ty C t rn dt- rrna r(ds ir tne fi -5t irs An t leas’, on’e derarA in tne peoa ricds 4 1 -j~ ’H - (1-p...t i s tt’e-t: e .. wren it :s rnc;, tne ait ’eri:,es e 0O i eo are i . veen e a pe n4l7 .c !.CC rp C. (j C :: p(4a 5s V.. r e ve ry i t e ’o ’or so

  8. River discharge controlling a tidal delta: the interplay between monsoon input and tidal reworking in SW Bangladesh

    NASA Astrophysics Data System (ADS)

    Hale, R. P.; Goodbred, S. L., Jr.; Bain, R. L.; Wilson, C.; Best, J.; Reed, M. J.

    2015-12-01

    The Ganges-Brahmaputra-Meghna River system (GBM) is among the world's largest in terms of both annual water and sediment discharge. The subaerial delta (110,000 km2) is home to ~160 million people, in addition to the ecologically and economically critical Sundarbans National Forest (SNF). Recent sediment budgets suggest that ~15% of the 1 x 109 t yr-1 sediment load carried by the GBM is subsequently advected along shore and inland via tidal activity, to the otherwise-abandoned SW portion of the delta. A unit-scale estimate based on observed offshore suspended sediment concentrations (SSC) >1.0 g L-1 suggests that sufficient sediment is available in the system to maintain the elevation of the subaerial delta plain, even under current relative sea-level-rise rates. Recent work measuring sedimentation within SNF corroborates this finding, and understanding these sediment delivery dynamics will be critical for protecting the future of nearby regions that are heavily populated, but drastically altered by human activities. Cross-channel hydrodynamic surveys were conducted to estimate what fraction of the water (and sediment) is diverted from the major tidal channels toward the SNF interior. Measurements including profiles of velocity and SSC were collected on spring and neap tides during the dry and monsoon seasons, along transects bracketing major conduit channels into the SNF. During the dry season, we observe water flux at the southern end of the study area to be in approximate equilibrium regardless of tidal range, with SSC <0.3 g L-1 during neap tides, and <1.0 g L-1 during spring tides. North of the SNF conduit channels, we observe equilibrium water discharge and similarly low SSC during neap tides, but a modest ebb dominance and surface SSC >1.0 g L-1 during spring tides. This suggests the possibility of additional inputs of water and sediment from an adjacent tidal channel, as well as a potential source for the deposition observed on the Sundarbans platform during spring-tide flooding. Within channels in SNF, near-bed SSC increase by >5x from neap to spring tides, to a peak of ~1.0 g L-1. Sediment grab samples collected in a distributary channel show a moderate fining trend with distance from the major conduit, which has implications for the sedimentation rates observed on the tidal delta plain.

  9. Reworking Practice through an AfL Project: An Analysis of Teachers' Collaborative Engagement with New Assessment Guidelines

    ERIC Educational Resources Information Center

    Hermansen, Hege; Nerland, Monika

    2014-01-01

    In recent years, the concept of Assessment for Learning (AfL) has travelled across countries, giving rise to a range of educational policy initiatives and school development projects. While researchers have focused on issues such as how formative assessment can support student learning and lead to more efficient classroom practices, less attention…

  10. Reworking Practice through an AfL Project: An Analysis of Teachers' Collaborative Engagement with New Assessment Guidelines

    ERIC Educational Resources Information Center

    Hermansen, Hege; Nerland, Monika

    2014-01-01

    In recent years, the concept of Assessment for Learning (AfL) has travelled across countries, giving rise to a range of educational policy initiatives and school development projects. While researchers have focused on issues such as how formative assessment can support student learning and lead to more efficient classroom practices, less attention…

  11. Productivity Enhancement Program (PEP) for the Power Plant Division, Naval Air Rework Facility, North Island, San Diego. Preliminary Data Required.

    DTIC Science & Technology

    1984-02-01

    wished to call a "step" in describing a process. However, responses do provide a rough indicator for the shop comparisons. RESULTS PPD Function...performing each task called for by the proceses, recording their performances (see Figure 5), and analyzing results. When the pilot team agrees on the...maintenance manuals used in the shops, officially called a local engineering change (LEC). These LECs, which, in turn, result in changes to the relevant

  12. The Precambrian of Transangaria, Yenisei Ridge (Siberia): Neoproterozoic microcontinent, Grenville-age orogen, or reworked margin of the Siberian craton?

    NASA Astrophysics Data System (ADS)

    Kuzmichev, Alexander B.; Sklyarov, Eugene V.

    2016-01-01

    The Yenisei Ridge was traditionally perceived as an uplifted segment of the western Siberian craton affected by Neoproterozoic collision events. However, the suggestions for Archaean or Palaeoproterozoic ('Siberian') basement in Transangaria have not been confirmed by reliable geochronological data. A new view regards most of the Ridge, namely, its Transangarian segment, to be an exotic Neoproterozoic terrane that collided with Siberia in the late Neoproterozoic. This paper presents new U-Pb SHRIMP zircon ages demonstrating that Archaean rocks (2611 ± 12 Ma) actually exist in this territory. We also provide a review of published U-Pb zircon ages for igneous and metamorphic rocks of Transangaria together with our new age data. This geochronological dataset clarifies the geology of the Yenisei Ridge and leads to new conclusions, as follows. (1) It is likely that Transangaria was originally underlain by an Archaean-Palaeoproterozoic basement, similar to that of the Siberian craton. (2) Geochronological data do not confirm the idea of widespread "Greenvillian age" granitoides in Transangaria. (3) The Neoproterozoic evolution of the Yenisei Ridge segment of the Siberian craton margin includes the following events. (i) Collision of an unidentified terrane with the western margin (in recent coordinates) of the Siberian craton during 900-855 Ma. The colliding terrane is no longer present in the current structure. (ii) Dextral shearing during 830-800 Ma may have been caused by counter-clockwise rotation of the Siberian craton. (iii) Extensional conditions prevailed during 800-700 Ma. The Isakovka oceanic basin formed at this time interval. (iv) Thrusting of the Isakovka island arc and accretionary prism onto the Siberian margin occurred during the late Neoproterozoic (650-630 Ma) and caused high-pressure metamorphism.

  13. A two-dimensional, time-dependent model of suspended sediment transport and bed reworking for continental shelves

    USGS Publications Warehouse

    Harris, C.K.; Wiberg, P.L.

    2001-01-01

    A two-dimensional, time-dependent solution to the transport equation is formulated to account for advection and diffusion of sediment suspended in the bottom boundary layer of continental shelves. This model utilizes a semi-implicit, upwind-differencing scheme to solve the advection-diffusion equation across a two-dimensional transect that is configured so that one dimension is the vertical, and the other is a horizontal dimension usually aligned perpendicular to shelf bathymetry. The model calculates suspended sediment concentration and flux; and requires as input wave properties, current velocities, sediment size distributions, and hydrodynamic sediment properties. From the calculated two-dimensional suspended sediment fluxes, we quantify the redistribution of shelf sediment, bed erosion, and deposition for several sediment sizes during resuspension events. The two-dimensional, time-dependent approach directly accounts for cross-shelf gradients in bed shear stress and sediment properties, as well as transport that occurs before steady-state suspended sediment concentrations have been attained. By including the vertical dimension in the calculations, we avoid depth-averaging suspended sediment concentrations and fluxes, and directly account for differences in transport rates and directions for fine and coarse sediment in the bottom boundary layer. A flux condition is used as the bottom boundary condition for the transport equation in order to capture time-dependence of the suspended sediment field. Model calculations demonstrate the significance of both time-dependent and spatial terms on transport and depositional patterns on continental shelves. ?? 2001 Elsevier Science Ltd. All rights reserved.

  14. Potential Geothermal Energy Use at the Naval Air Rework Facilities, Norfolk, Va., and Jacksonville, Fla., and at the Naval Shipyard, Charleston, S.C.

    DTIC Science & Technology

    1984-05-01

    9 quartzite i 10 basalt/ diabase (Triassic?) Richards (1954) 11 red shale/basalt (Triassic?) Richards (1954) 12 felsic lithic/crys~al metatuff...therein consist of basalts and rhyolites, diabases , and continental clastic sediments. Beneath the Coastal Plain sediments, the pre-Cretaceous ’V basement

  15. Upwelling-driven reworking of a MTD's fine-grained plume: an example at the Cariaco Basin/Cariaco Gulf connection.

    NASA Astrophysics Data System (ADS)

    Aguilar, Iliana; Beck, Christian; Audemard, Franck; Crouzet, Christian; Sabatier, Pierre; Develle, Anne-Lise; Boussafir, Mohammed; Campos, Corina

    2016-04-01

    The Cariaco Basin is a 1400 m-deep and 90 km-wide pull-apart basin, in the south-eastern corner of the Caribbean Sea. To the East, it is connected to the Cariaco Gulf, a 60 km-long, 15 km-wide, and 90 m-deep appendix. Both are E-W elongated and developed upon the south-eastern transform boundary of the Caribbean Plate, an active limit here mainly represented by the El Pilar Fault. The Gulf of Cariaco entrance is a 55 m-deep, and 5 km-wide sill mainly controlled by the large Manzanares River delta, which western foreset slope is facing the Basin's eastern edge. Within this connection area, two particular sedimentary processes have been previously documented: 1) strong seasonal upwelling responsible for the transfer of deep particulate organic matter from the Basin into the Gulf; 2) the recent occurrence, in the Basin, of a fine-grained suspension related to a submarine landslide; this event was detected after the 1997 Cariaco earthquake (Thunell et al., 1999; Lorenzoni et al., 2012) and was related to a slope failure of the Manzanares delta western foreset. From short gravity cores retrieved in the Gulf, we analysed the last millennium of sedimentation (components, transport and settling processes) using classical proxies and physical properties. All parameters led to underline: - a permanent mixed provenance of particulate Organic Matter in the main part of the Gulf: i) in situ and ii) allochtonous; - the occurrence of coarse siliciclastic layers related to flooding from the southern edge of the Gulf; - the occurrence of one peculiar fine-grained siliciclastic layer with a widespread distribution, dated around 1850 AD; - an abrupt increase of open marine influence just after the above-mentioned layer. Concerning the "background" permanent sedimentation, these results confirm the importance of upwelling through the connection between the Gulf and the Basin (transfer of the "allochtonous" O.M.). For the fine-grained silicilastic "event", we could discard a consequence of flooding from the Manzanares River. We rather envisage an upwelling-driven suspension brought from the Basin and dispersed into the Gulf. We tentatively relate the genesis of this peculiar load to a mechanism similar to what was described for the 1997 event. A major earthquake-triggered tsunami occurred in 1853 in the concerned area, related to a MTD. We thus propose to correlate this peculiar layer with the 1853 event. Due to this earthquake and the associated tsunami, the upwelling transported fined-grained siliciclastics removed from the western slope of the Manzanares delta. Such a combination of a MTD-generated plume with the permanent upwelling may have occurred several times since the establishment of the connection during the post-MIS2 sea-level rise (Van Daele et al., 2011). The resulting specific layers may thus be used for paleo-earthquakes/paleo-tsunamis detection; furthermore, several major MTDs were imaged on high resolution seismic profiles across the concerned connecting area (Aguilar et al., 2015). Ref.: Aguilar, I., et al., 2015. Comptes Rendus Geoscience, in press. Lorenzoni, L., et al., 2012. Marine Geology, 307:105-110. Thunell, R., 1999. Nature, 398:233-236. Van Daele, M., et al., 2011, Marine Geology 279:37-51.

  16. Analysis of reworked sediments as a basis of the Palaeogene-Neogene palaeogeography reinterpretation: Case study of the Roztocze region (SE Poland)

    NASA Astrophysics Data System (ADS)

    Margielewski, Włodzimierz; Jankowski, Leszek; Krąpiec, Marek; Garecka, Małgorzata; Hałas, Stanisław; Urban, Jan

    2017-05-01

    Radiometric K/Ar dating of glauconite and nanno- and micropaleontologic analyses of calcareous nannoplankton, foraminifers and dinoflagellates isolated from the Miocene rocks in the Polish part of the Roztocze region, a northeastern part of the fore-bulge of the Carpathian Foreland Basin System - CFBS), SE Poland, reveal that these strata contain numerous microfossils and glauconite grains of the Upper Eocene and Lower Oligocene age. Such occurrences clearly indicate that these materials were redeposited from the Upper Eocene and Lower Oligocene marine rocks that must have originally covered most of the Roztocze and the surrounding area. It is therefore proposed herein that the geographical extent of the boreal, epi-continental basin during the Eocene-Oligocene was much greater than previously considered. Moreover, it appears that this basin was connected with the back-bulge zone of the warm Carpathian Basin (originally a northern part of the Tethys Basin which since Eocene/Oligocene boundary remained isolated as the Paratethys Basin). Hence, it is unlikely that the Roztocze region was uplifted during the Palaeogene as part of the Meta-Carpathian Swell, as it was earlied hypothesized. Instead, the Roztocze Swell formed during the Sarmatian, in the last stage of the development of the fore-bulge structure in the foreland of the up-thrust Carpathian orogenic belt. Multiple redeposition of sediments is the reason that the absolute dating (K/Ar) of glauconite, as well as incomprehensive palaeontological analysis could result in erroneous stratigraphic and palaeogeographic interpretations.

  17. Tectono-metamorphic evolution of the internal zone of the Pan-African Lufilian orogenic belt (Zambia): Implications for crustal reworking and syn-orogenic uranium mineralizations

    NASA Astrophysics Data System (ADS)

    Eglinger, Aurélien; Vanderhaeghe, Olivier; André-Mayer, Anne-Sylvie; Goncalves, Philippe; Zeh, Armin; Durand, Cyril; Deloule, Etienne

    2016-01-01

    The internal zone of the Pan-African Lufilian orogenic belt (Zambia) hosts a dozen uranium occurrences mostly located within kyanite micaschists in a shear zone marking the contact between metasedimentary rocks attributed to the Katanga Neoproterozoic sedimentary sequence and migmatites coring domes developed dominantly at the expense of the pre-Neoproterozoic basement. The P-T-t-d paths reconstructed for these rocks combining field observations, microstructural analysis, metamorphic petrology and thermobarometry and geochronology indicate that they have recorded burial and exhumation during the Pan-African orogeny. Both units of the Katanga metasedimentary sequence and pre-Katanga migmatitic basement have underwent minimum peak P-T conditions of 9-11 kbar and 640-660 °C, dated at ca. 530 Ma by garnet-whole rock Lu-Hf isochrons. This suggests that this entire continental segment has been buried up to a depth of 40-50 km with geothermal gradients of 15-20 °C.km- 1 during the Pan-African orogeny and the formation of the West Gondwana supercontinent. Syn-orogenic exhumation of the partially molten root of the Lufilian belt is attested by isothermal decompression under P-T conditions of 6-8 kbar at ca. 530-500 Ma, witnessing an increase of the geothermal gradients to 25-30 °C·km- 1. Uranium mineralizations that consist of uraninite and brannerite took place at temperatures ranging from 600 to 700 °C, and have been dated at ca. 540-530 Ma by U-Pb ages on uraninite. The main uranium deposition thus occurred at the transition from the syn-orogenic burial to the syn-orogenic exhumation stages and has been then partially transposed and locally remobilized during the post-orogenic exhumation accommodated by activation of low-angle extensional detachment.

  18. Constraints from zircon geochronology on the tectonic evolution of the Borborema Province (NE Brazil): Widespread intracontinental Neoproterozoic reworking of a Paleoproterozoic accretionary orogen

    NASA Astrophysics Data System (ADS)

    Neves, Sérgio Pacheco

    2015-03-01

    U-Pb zircon ages of igneous and metaigneous rocks in orogenic belts provide important information concerning the occurrence and duration of magmatic and metamorphic events whereas detrital zircon ages of metasedimentary sequences place constrains on the sources and deposition ages of supracrustal rocks. With these data, it is possible to compare and establish correlations between different provinces or between domains of the same province. A sufficiently large dataset of U-Pb ages is now available from the Borborema Province, northeastern Brazil, allowing the use of statistical methods to identify age peaks. 210 U-Pb crystallization ages from magmatic rocks and ca. 2300 U-Pb zircon ages of detrital grains from metasedimentary rocks were compiled. The igneous age spectrum shows two large age clusters. The first spans about 300 Ma, from 2.25 Ga to 1.97 Ga. Orthogneissic complexes in the Rio Grande do Norte Domain have ages mainly between 2.22 and 2.15 Ga whereas in the remainder of the province they more commonly range from 2.18 to 2.0 Ga. The long duration of this magmatism is comparable to that of Neoproterozoic and Phanerozoic accretionary/collisional orogens and is inferred to have resulted from amalgamation of preexisting crustal blocks and juvenile material to the active margin of the Rio Grande do Norte Domain. The other large cluster of ages is much narrower, from 650 Ma to 550 Ma, which is more consistent with the duration of orogenesis in collisional belts. Orogenic granitoids older than 600 Ma were not yet identified in the Rio Grande do Norte Domain, perhaps reflecting a thicker lithosphere that delayed initiation of the Brasiliano Orogeny. In contrast with the igneous rock-zircon record, the detrital zircon record requires sources with ages that span almost the whole Proterozoic eon. The presence of zircons ages in the 1.5-1.0 Ga and 0.85-0.65 Ga intervals, which contrasts with their absence, in the first case, or rarity, in the second case, amongst the igneous rocks, may be explained by derivation from igneous sources as yet undiscovered or removed by erosion, and/or by provenance from distal sources. The occurrence of 2.15-2.05 Ga-old detrital zircons in the Rio Grande do Norte Domain and of Tonian zircons in this domain and in the Ceará Central and Médio Coreaú domains imply the inexistence of physical barriers separating the northern and southern domains of the Borborema Province during the Neoproterozoic. The results are consistent with deposition in an intracratonic setting that became the site of lithospheric extension in response to far-field stresses. The ages of the youngest detrital zircons (650-630 Ma) indicate that deposition ended just before or at the beginning of the Brasiliano Orogeny.

  19. Potential geothermal energy use at the Naval Air Rework Facilities, Norfolk, Virginia and Jacksonville, Florida, and at the naval shipyard, Charleston, South Carolina

    SciTech Connect

    Costain, J.K.; Glover, L. III; Newman, R.W.

    1984-05-01

    The feasibility of geothermal energy use at naval installations in Norfolk, VA, Jacksonville, FL, and Charleston, SC was assessed. Geophysical and geological studies of the above areas were performed. Engineering and economic factors, affecting potential energy use, were evaluated. The Norfolk and Jacksonville facilities are identified as candidates for geothermal systems. System costs are predicted. Economic benefits of the proposed geothermal systems are forecast, using the net present value method of predicting future income.

  20. The Bir Safsaf Precambrian inlier of South West Egypt revisited. A model for ~ 1.5 Ga T DM late Pan-African granite generation by crustal reworking

    NASA Astrophysics Data System (ADS)

    Bea, F.; Montero, P.; Anbar, M. Abu; Molina, J. F.; Scarrow, J. H.

    2011-08-01

    Bir Safsaf is one of the four Precambrian inliers of the southern Egyptian Western Desert; it is located midway between the juvenile crust of the Arabian-Nubian Shield and the Archean terranes of Gebel Kamil, near the Libyan border. Contrary to previous belief, Bir Safsaf is exclusively composed of late Pan-African granitoids, with U/Pb SHRIMP ages between 627 Ma and 595 Ma. The presence of pre-Pan-African materials is limited to scarce inherited zircons with ~ 2.1 Ga and ~ 2.7 Ga, ages that are well-represented in the pre-Pan-African terranes of the neighboring Gebel Kamil inlier. Early Pan-African inherited zircons with ages of ~ 640-650 Ma and ~ 750 Ma are also found. The granitoids of Bir Safsaf show a large geochemical variability, with an overall composition similar to subduction-related granites, but they lack the inter-elemental correlations characteristic of magmatic differentiation, magma mixing or hybridization. This chemically heterogeneous set of granitoids has, nonetheless, nearly uniform initial 87Sr/ 86Sr and 143Nd/ 144Nd, and a ~ 1.5 Ga Nd model age (T DM) despite no new crust being formed at that time in northeast Africa. To reconcile the large chemical variability, the isotopic homogeneity, and the "mixed" Nd model age, we propose that these granitoids were derived from a lithologically heterogeneous pre-Pan African source that, prior to melting, was thoroughly homogenized with respect to Sr and Nd isotopes by convective metasomatism caused by juvenile hydrothermal fluids probably released from a subduction zone.

  1. Reactivation versus reworking of the active continental margin during the Zagros collision: Mahallat-Muteh-Laybid complexes, Sanandaj-Sirjan zone, Iran

    NASA Astrophysics Data System (ADS)

    Aflaki, Mahtab; Shabanian, Esmaeil; Davoodi, Zeinab; Mohajjel, Mohammad

    2017-06-01

    Reactivation of long-lived basement faults has significant influences on further deformation of collision zones. Three major inherited pre-collisional NW-, N- and NE-trending basement discontinuities have played important roles on the structural and tectono-sedimentary evolution of the Iranian micro-continent in the northeastern part of the Gondwana super-continent. Sanandaj-Sirjan zone (SSZ), known as the metamorphic belt of the Zagros orogeny, marks the SW margin of the Central Iran. SSZ is formed as a result of the Arabia-Eurasia collision and its general trend of deformation coincides with the NW structural trend of the collision. The NE-trending Mahallat, Muteh and Laybid complexes in the middle part of the NW-trending SSZ are the exception and have a trend almost normal to the NW-trending Zagros. A combined methodology of remote sensing, geometric and kinematics analyses complemented by field work was used to reconstruct the history of deformation in the Zagros hinterland since the earlier stages of collision to the present-day. Our results reveal the key role of the preexisting discontinuities of the Iranian basement in both the kinematics and structural pattern of the middle part of the SSZ. These basement faults have acted as main boundary conditions changing the collisional fabric perpendicular to its overall trend. Progressive deformation and the related changes during collision have caused drastic changes in the kinematics of the boundary faults. The establishment of dextral transtension in the SSZ has had secondary influences on the pattern of deformation by local clockwise rotation and localized dextral shear in the southern parts of the area of interest. This study highlights the significance of long-lived pre-existing structures in the deformation of collision zones. Such basement faults are capable to change both the pattern and kinematics of deformation of the adjacent areas involved in a continental collision.

  2. Geothermal energy development in the eastern United States: technical assistance report no. 5. Geothermal space heating-naval air rework facility, Norfolk, Virginia. [Aircraft hangers

    SciTech Connect

    Hill, F.K.; Henderson, R.W.

    1980-06-01

    The electronic integration hangar, designated LP-167, was selected for study, as it was a single-story building with a large floor area. Because of the high ceiling and the sliding doors necessary to admit aircraft, the heat loss rate, based on floor area, was about twice that of commercial buildings. It was furnished with an oil-fired hot water heating system capable of high thermal output to meet heating requirements in the coldest weather. On the basis of the known characteristics of geothermal sources for the Atlantic Coastal Plain, and wells drilled and assayed in the Norfolk area, a reasonable estimate of the parameters of a well drilled at NARF was made. This included a low temperature output from the well of only 107/sup 0/F, so that direct transfer of warm water between the wellhead heat exchanger (HX) and the hot water radiating system in the building was not practical. Four design options are explored and calculations are presented on each one.

  3. A Preliminary Analysis of TF34-100/400 Jet Engine Rework Data in Support of the MRP System Implementation at NARF Alameda.

    DTIC Science & Technology

    1981-12-01

    requisitions and generating replace- ment probability factors . This information is then used with stock cost projections in a proposed Repair Parts...historical demand 12 data and the effects of utilizing the proposed Repair Parts Inventory Model. The major factors that should be considered in...phase [Ref. 5]. To facilitate the understanding of this code, the TF34 engine will be used as an example. Because of external factors , the material

  4. 75 FR 59710 - Agency Information Collection Activities; Submission to OMB for Review and Approval; Comment...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-09-28

    ... Manufacturing and Rework Industry Information Collection AGENCY: Environmental Protection Agency (EPA). ACTION... . Title: Aerospace Manufacturing and Rework Industry Information Collection ICR number: EPA ICR Number... ICR was developed specifically for aerospace manufacturing and rework facilities and has been...

  5. Industrial Processes to Reduce Generation of Hazardous Waste at DoD Facilities. Phase III Report. Appendix B. Workshop Manual Innovative Hard Chrome Plating, Pensacola Naval Air Rework Facility, Pensacola, Florida.

    DTIC Science & Technology

    1985-12-01

    dermatitis, skin ulcers, and na- sures above 0.05 mg/m 3 TWA. In a later criteria sat irritation varying from rhinitis to perforation of the nasal ...6.4.1 %10 Pensacola NA RF, Spray Rinse 1.0 1.0 1.0 1.0 1.0 10.0 S * 5.4.4 *26 Pensacola NAR F, Dry Paint Strip 1.0 1.0 1.0 1.0 1.0 10.0 S * 3.4.3 5...Technology Elegant In its Simplicity * Plastic Media Paint Stripping % o Solvent Recovery Stills * Vehicle Wash & Maintenance * Spray Rinse System 1-19 W

  6. Zircon Lu-Hf isotopes and granite geochemistry of the Murchison Domain of the Yilgarn Craton: Evidence for reworking of Eoarchean crust during Meso-Neoarchean plume-driven magmatism

    NASA Astrophysics Data System (ADS)

    Ivanic, Timothy J.; Van Kranendonk, Martin J.; Kirkland, Christopher L.; Wyche, Stephen; Wingate, Michael T. D.; Belousova, Elena A.

    2012-09-01

    New in situ Lu-Hf data on zircons from GSWA geochronology samples has provided a unique isotopic dataset with a high temporal resolution for the Murchison Domain of the Yilgarn Craton in Western Australia. These data identify extended periods of juvenile mantle input (positive ɛHf values) into the crust firstly at c. 2980 Ma and then from c. 2820 Ma to c. 2640 Ma with significant pulses of crustal recycling at c. 2750 Ma and c. 2620 Ma (highly negative ɛHf values). Geochemical data from well-characterised granitic suites of the Murchison Domain provide additional constraints on the crustal evolution of the area and indicate a prolonged period of crustal melting and remelting at progressively shallower depths from c. 2750 to c. 2600 Ma. At c. 2760-2753 Ma, widespread calc-alkaline, intermediate to silicic volcanic rocks of the Polelle Group were erupted, accompanied by intrusion of felsic to intermediate melts derived from a variety of crustal sources that likely formed by partial mixing with basaltic melts. The intrusive rocks include a wide geochemical array of rocks in the Cullculli and Eelya suites that were sourced over a wide range of crustal depths. At this time a major departure to negative ɛHf values (<-5) occurred, indicating sampling of c. 3.80 Ga model aged source rocks as well as continued juvenile input. Post-volcanic granitic rocks emplaced between c. 2710 and c. 2600 Ma show geochemical evidence for progressive fractionation through time and derivation from an evolving crustal source. We interpret the driving force for this protracted history of mantle and crustal melting to be two mantle plumes at 2.81 and 2.72 Ga. These data document the process of cratonization through progressive melt depletion of the lower crust, progressively fractionating and shallower melts, culminating with a final phase of crustal recycling (ɛHf < - 5) and the cessation of juvenile input at c. 2630-2600 Ma during intrusion of the Bald Rock Supersuite, resulting in cratonization of this part of the Yilgarn Craton.

  7. Beyond Work First: How To Help Hard-To-Employ Individuals Get Jobs and Succeed in the Workforce. A How-To Guide. ReWORKing Welfare: Technical Assistance for States and Localities.

    ERIC Educational Resources Information Center

    Brown, Amy

    This guide distills lessons from an extensive body of research into practical advice for policymakers and practitioners concerned with helping hard-to-employ individuals find jobs and succeed in the work force. Part 1 examines the following topics: characteristics of the hard-to-employ; the prevalence of various barriers to employment; and the…

  8. In-situ zircon U-Pb age and Hf-O isotopic constraints on the origin of the Hasan-Robat A-type granite from Sanandaj-Sirjan zone, Iran: implications for reworking of Cadomian arc igneous rocks

    NASA Astrophysics Data System (ADS)

    Honarmand, Maryam; Li, Xian-Hua; Nabatian, Ghasem; Neubauer, Franz

    2017-01-01

    The Lower Permian Hasan-Robat syenogranite occurs as a single pluton and intruded the Upper Carboniferous-Lower Permian sandstones and dolomitic limestones in the central part of the Sanandaj-Sirjan zone. This syenogranitic intrusion shows A-type granitic affinity and is a good representative of Early Permian igneous activity in Iran. SIMS U-Pb zircon analyses indicate a crystallization age of 294.2 ± 2.5 Ma for the Hasan-Robat A-type granite. In-situ Lu-Hf and oxygen isotope analyses of magmatic zircons were carried out to infer the magma sources and evolution of the Hasan-Robat A-type syenogranite. The Hf-O zircon isotopic compositions are relatively homogeneous, with nearly chondritic ɛHf(t) values of -0.8 to +2.4 corresponding to two-stage zircon Hf model ages of 1.15-1.36 Ga. The δ18O values of zircon range from +7.6 to +8.6‰. The Hf model ages of the Hasan-Robat zircons is within the range of those reported from the Cadomian granitoids in Iran. The isotopic features of the Hasan-Robat syenogranite are in good agreement with Hf isotopic values and Hf and Nd model ages reported from the Cadomian arc magmatic suites in Iran. Thus, partial melting of these Cadomian igneous rocks would be the favorite source for the Hasan-Robat syenogranitic magma during the opening of the Neotethys Ocean and separation of Iranian terranes from the northern margin of Gondwana.

  9. Maintenance Engineering Contract Requirements Study.

    DTIC Science & Technology

    1980-10-01

    ILSP Engrg Change Sprt Sect G NA G S UDI-E-21065 Plan, ILSP Depot & Inter Rework Sprt G NA G S Sect UDI-L- 21069 Candidate List, Analytical Rework NA...UDI-L- 21069 Candidate List, Ana- 120 days prior to start of As changes occur lytical Rework Pro- MEI gram (ARP) UDI-R-21131 Report, Reliability 60 DARO

  10. 43 CFR 3135.1-5 - Extension of lease.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... when drilling is commenced on the adjacent or adjoining lands for the purpose of directional drilling..., drilling or reworking of any such directional well shall be considered production or drilling or reworking... capable of being produced in paying quantities from the lease; or (3) So long as drilling or reworking...

  11. Value-Driven Incremental Development (Poster)

    DTIC Science & Technology

    2014-10-27

    rework during development. Multi-dimensional Analysis What is the design implication of a release decision? Architecting for Incremental Assurance...measures are needed to make good release decisions? Selected FY14 Results • Improved rework analysis by making architectural dependency information...studies and surveys with organizations revealed architectural rework occurs in such context and can be managed by better quantification of technical

  12. Processes Controlling Transfer of Fine-Grained Sediment within and Between Channels and Flats on Intertidal Flats

    DTIC Science & Technology

    2010-09-30

    through channel bed reworking with less transfer between channels and surrounding flats. Figure 5. Uncalibrated...surface elevation, current magnitude, and bed elevation. There is an approximately 2 cm reworking of the channel seabed when the tide is low and flow...within the braided tidal-channel system act to deliver, rework and rapidly export sand and mud to the seaward edge of the flat. Hydrodynamic

  13. 48 CFR 17.103 - Definitions.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... AND CONTRACT TYPES SPECIAL CONTRACTING METHODS Multiyear Contracting 17.103 Definitions. As used in... equipment, preproduction engineering, initial spoilage and rework, and specialized work force training...

  14. 77 FR 8811 - Takes of Marine Mammals Incidental to Specified Activities; St. George Reef Light Station...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-02-15

    ... Activities Restoration activities would include the removal of peeling paint and plaster, restoration of interior plaster and paint, refurbishing structural and decorative metal, reworking original metal support...

  15. NASA-DoD Lead-Free Electronics Project

    NASA Technical Reports Server (NTRS)

    Kessel, Kurt

    2007-01-01

    The primary technical objective of the project is to undertake comprehensive testing to generate information on failure modes/criteria to better understand the reliability of: Packages (e.g., TSOP, BGA, PDIP) assembled and reworked with lead-free alloys Packages (e.g., TSOP, BGA, PDIP) assembled and reworked with mixed (lead/lead-free) alloys.

  16. Recommended Processes and Best Practices for Nondestructive Inspection (NDI) of Safety-Of-Flight Structures

    DTIC Science & Technology

    2008-10-01

    could include hidden fasteners or welds in metallic structures or even sudden ply drop-offs in composite laminates Affectivity A list of the...altered in some way so they cannot be mistakenly re-installed. 56 One problem is that most parts are reworked until the rework limits are reached

  17. Acid Test For Annealing Of Welds

    NASA Technical Reports Server (NTRS)

    Deese, Gary E.; Ellgass, Joseph P.

    1989-01-01

    Solution changes color if heat-treated condition lost. Simple test indicates whether welded joint retained its postweld heat-treated condition after reworking including rewelding and grinding. Test used instead of Rockwell or Brinell hardness tests when reworked surface inaccessible to hardness-testing apparatus or when small surface imperfections created by apparatus unacceptable.

  18. Speaking Habermas to Gramsci: Implications for the Vocational Preparation of Community Educators

    ERIC Educational Resources Information Center

    Bamber, John; Crowther, Jim

    2012-01-01

    Re-working the Gramscian idea of the "organic" intellectual from the cultural-political sphere to Higher Education (HE), suggests the need to develop critical and questioning "counter hegemonic" ideas and behaviour in community education students. Connecting this reworking to the Habermasian theory of communicative action, suggests that these…

  19. 75 FR 16685 - Airworthiness Directives; Airbus Model A300-600 and A310 Airplanes

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-04-02

    ... confirmed that the defects were the result of de-bonding between the skin and honeycomb core. Such reworks were also performed on some rudders fitted on A310 and A300-600 aeroplanes. An extended de-bonding, if... reworked in production. The investigation confirmed that the defects were the result of de-bonding...

  20. Reduction of construction wastes by improving construction contract management: a multinational evaluation.

    PubMed

    Mendis, Daylath; Hewage, Kasun N; Wrzesniewski, Joanna

    2013-10-01

    The Canadian construction industry generates 30% of the total municipal solid waste deposited in landfills. Ample evidence can be found in the published literature about rework and waste generation due to ambiguity and errors in contract documents. Also, the literature quotes that disclaimer clauses in contract documents are included in the contractual agreements to prevent contractor claims, which often cause rework. Our professional practice has also noted that there are several disclaimer clauses in standard contract documents which have the potential to cause rework (and associated waste). This article illustrates a comparative study of standard contractual documents and their potential to create rework (and associated waste) in different regions of the world. The objectives of this study are (1) to analyse standard contractual documents in Canada, the USA and Australia in terms of their potential to generate rework and waste, and (2) to propose changes/amendments to the existing standard contract documents to minimise/avoid rework. In terms of construction waste management, all the reviewed standard contract documents have deficiencies. The parties that produce the contract documents include exculpatory clauses to avoid the other party's claims. This approach tends to result in rework and construction waste. The contractual agreements/contract documents should be free from errors, deficiencies, ambiguity and unfair risk transfers to minimise/avoid potential to generate rework and waste.

  1. Acid Test For Annealing Of Welds

    NASA Technical Reports Server (NTRS)

    Deese, Gary E.; Ellgass, Joseph P.

    1989-01-01

    Solution changes color if heat-treated condition lost. Simple test indicates whether welded joint retained its postweld heat-treated condition after reworking including rewelding and grinding. Test used instead of Rockwell or Brinell hardness tests when reworked surface inaccessible to hardness-testing apparatus or when small surface imperfections created by apparatus unacceptable.

  2. 77 FR 36224 - Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Airplanes

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-06-18

    ... aluminum sheets; modifying the lights assembly on the tail boom rear movable fairing; and replacing the....] * * * * * The required actions include installing or reworking, as applicable, metallic diverters and aluminum..., whichever occurs first: Install or rework, as applicable, metallic diverters and aluminum sheets; modify...

  3. 75 FR 54869 - Agency Information Collection Activities; Submission to OMB for Review and Approval; Comment...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-09-09

    ... Request; NESHAP for Aerospace Manufacturing and Rework Facilities (Renewal), EPA ICR Number 1687.08, OMB... for Aerospace Manufacturing and Rework Facilities (Renewal) ICR Numbers: EPA ICR Number 1687.08, OMB... National Emission Standards for Hazardous Air Pollutants (NESHAP) for Aerospace Manufacturing and...

  4. Speaking Habermas to Gramsci: Implications for the Vocational Preparation of Community Educators

    ERIC Educational Resources Information Center

    Bamber, John; Crowther, Jim

    2012-01-01

    Re-working the Gramscian idea of the "organic" intellectual from the cultural-political sphere to Higher Education (HE), suggests the need to develop critical and questioning "counter hegemonic" ideas and behaviour in community education students. Connecting this reworking to the Habermasian theory of communicative action, suggests that these…

  5. 78 FR 65163 - Airworthiness Directives; Sikorsky Aircraft Corporation-Manufactured (Sikorsky) Model Helicopters...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-10-31

    ... required inspecting and reworking the main gearbox (MGB) assembly second stage lower planetary plate (plate..., September 12, 1997), which required inspecting and reworking the MGB assembly plate. Since AD 97-19-10 was... gearbox second stage lower planetary plate and second stage planetary plate assembly assuming...

  6. An effective and optimal quality control approach for green energy manufacturing using design of experiments framework and evolutionary algorithm

    NASA Astrophysics Data System (ADS)

    Saavedra, Juan Alejandro

    Quality Control (QC) and Quality Assurance (QA) strategies vary significantly across industries in the manufacturing sector depending on the product being built. Such strategies range from simple statistical analysis and process controls, decision-making process of reworking, repairing, or scraping defective product. This study proposes an optimal QC methodology in order to include rework stations during the manufacturing process by identifying the amount and location of these workstations. The factors that are considered to optimize these stations are cost, cycle time, reworkability and rework benefit. The goal is to minimize the cost and cycle time of the process, but increase the reworkability and rework benefit. The specific objectives of this study are: (1) to propose a cost estimation model that includes energy consumption, and (2) to propose an optimal QC methodology to identify quantity and location of rework workstations. The cost estimation model includes energy consumption as part of the product direct cost. The cost estimation model developed allows the user to calculate product direct cost as the quality sigma level of the process changes. This provides a benefit because a complete cost estimation calculation does not need to be performed every time the processes yield changes. This cost estimation model is then used for the QC strategy optimization process. In order to propose a methodology that provides an optimal QC strategy, the possible factors that affect QC were evaluated. A screening Design of Experiments (DOE) was performed on seven initial factors and identified 3 significant factors. It reflected that one response variable was not required for the optimization process. A full factorial DOE was estimated in order to verify the significant factors obtained previously. The QC strategy optimization is performed through a Genetic Algorithm (GA) which allows the evaluation of several solutions in order to obtain feasible optimal solutions. The GA

  7. Effect of Rolling Bearing Refurbishment and Restoration on Bearing Life and Reliability

    NASA Technical Reports Server (NTRS)

    Zaretsky, Erwin V.; Branzai, Emanuel V.

    2005-01-01

    For nearly four decades it has been a practice in commercial and military aircraft application that rolling-element bearings removed at maintenance or overhaul be reworked and returned to service. The work presented extends previously reported bearing life analysis to consider the depth (Z(45)) to maximum shear stress (45) on stressed volume removal and the effect of replacing the rolling elements with a new set. A simple algebraic relationship was established to determine the L(10) life of bearing races subject to bearing rework. Depending on the extent of rework and based upon theoretical analysis, representative life factors (LF) for bearings subject to rework ranged from 0.87 to 0.99 the lives of new bearings. Based on bearing endurance data, 92 percent of the bearing sets that would be subject to rework would result in L(10) lives equaling and/or exceeding that predicted for new bearings with the remaining 8 percent having the potential to achieve the analytically predicted life of new bearings when one of the rings is replaced at rework.. The potential savings from bearing rework varies from 53 to 82 percent that of new bearings depending on the cost, size and complexity of the bearing.

  8. The Coastal Dynamics of Heterogeneous Sedimentary Environments: Numerical Modeling of Nearshore Hydrodynamics and Sediment Transport

    DTIC Science & Technology

    2010-05-10

    currents are present, the same volume of sediment is redeposited repeatedly ( reworked ) with no net erosion or deposition. When a mean flow exists...response to erosion and deposition, wave reworking extends below the bed to a depth which is HE HD HR HD HR HR HE HR HD HRHE HR HE HR HD HR HR HD 8 in...also defined in Figure 5. The apparent erosion depth ZA is the maximum reworking depth during a time interval. The reference elevation ZR is the

  9. Mud, Macrofauna and Microbes: An ode to benthic organism-abiotic interactions at varying scales

    EPA Science Inventory

    Benthic environments are dynamic habitats, subject to variable sources and rates of sediment delivery, reworking from the abiotic and biotic processes, and complex biogeochemistry. These activities do not occur in a vacuum, and interact synergistically to influence food webs, bi...

  10. Documenting Fine-Sediment Import and Export for Two Contrasting Mesotidal Flats

    DTIC Science & Technology

    2009-01-01

    reworking , bioturbation) impacting seabed characteristics. Researchers analyzing boundary- layer processes also utilize these data to determine...PUBLICATIONS Boldt, K., Nittrouer, C.,and Ogston, A. (2009) Linking sediment transport processes to laminated seabed deposits in a fine-grained

  11. 77 FR 71033 - Notice of Applications for Modification of Special Permit

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-11-28

    ... Defense Wilson, NC. 175.3. authorize a rework procedure to allow fire extinguishers which were ``steel... special Riverside, CA. 173.302(a)(1), permit by replacing the 173.304(a) and current CFFC gunfire...

  12. Late Quaternary stratigraphy and depositional history of the Long Island Sound basin

    USGS Publications Warehouse

    Lewis, Ralph S.; Stone, Janet R.

    1991-01-01

    Where quiet waters prevail, marine mud generally less than 15 m thick blankets the older deposits of the Basin. Elsewhere, especially in eastern LIS, tidal currents are actively reworking and transporting glacial and postglacial deposits.

  13. Granular Microbial Habitats Built from Iron Sulfides: Alternative Microbial Lifestyles?

    NASA Astrophysics Data System (ADS)

    Schieber, J.

    2005-03-01

    Concentrically zoned pyrite grains grew as granular microbial colonies. They stayed in the surface layer during long history of reworking and accretion and consist of marcasite and pyrite cortices with sulfide mineralized microbial remains.

  14. 78 FR 68054 - Information Collection Request Submitted to OMB for Review and Approval; Comment Request; NESHAP...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-11-13

    ... for Aerospace Manufacturing and Rework Facilities (Renewal) AGENCY: Environmental Protection Agency (EPA). ACTION: Notice. SUMMARY: The Environmental Protection Agency has submitted an information....gov , or by mail to: EPA Docket Center, Environmental Protection Agency, Mail Code 28221T,...

  15. Mud, Macrofauna and Microbes: An ode to benthic organism-abiotic interactions at varying scales

    EPA Science Inventory

    Benthic environments are dynamic habitats, subject to variable sources and rates of sediment delivery, reworking from the abiotic and biotic processes, and complex biogeochemistry. These activities do not occur in a vacuum, and interact synergistically to influence food webs, bi...

  16. 76 FR 12728 - Agency Information Collection Activities OMB Responses

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-03-08

    ... 2395.01; Aerospace Manufacturing And Rework Industry Information Collection; was approved on 02/03/2011... change. EPA ICR Number 2398.02; Regulation of Fuels and Fuel Additives: 2011 Renewable Fuel...

  17. Internal auditing of the revenue cycle: are you getting your fair share?

    PubMed

    Egusquiza, Day

    2007-02-01

    Internal auditing of the revenue cycle begins with the collection of data regarding areas of risk, including: Rework. Rejected claims. Multiple "touches" to submit a clean claim. Lost revenue. Patient complaints. Poor or incomplete documentation.

  18. A Time for Flexible Donor Agreements.

    ERIC Educational Resources Information Center

    Fischer, Gerald B.

    2003-01-01

    Discusses why volatile markets and new donor expectations make now a good time to rework payout rates and gift agreements to bolster financial and strategic performance. Suggests seven options for action. (EV)

  19. Building America Top Innovations 2013 Profile – Quality Management System Guidelines

    SciTech Connect

    none,

    2013-09-01

    This Top Innovation profile describes quality management system tools that were customized for residential construction by BSC, IBACOS, and PHI, for use by builders, trades, and designers to help eliminate mistakes that would require high-cost rework.

  20. NASA-DoD Lead-Free Electronics Project

    NASA Technical Reports Server (NTRS)

    Kessel, Kurt R.

    2009-01-01

    The primary technical objective of this project is to undertake comprehensive testing to generate information on failure modes/criteria to better understand the reliability of: (1) Packages (e.g., Thin Small Outline Package [TSOP], Ball Grid Array [BGA], Plastic Dual In-line Package [PDIP]) assembled and reworked with lead-free alloys, (2) Packages (e.g., TSOP, BGA, PDIP) assembled and reworked with mixed (lead/lead-free) alloys.

  1. NASA DOD Lead Free Electronics Project

    NASA Technical Reports Server (NTRS)

    Kessel, Kurt R.

    2008-01-01

    The primary'technical objective of this project is to undertake comprehensive testing to generate information on failure modes/criteria to better understand the reliability of: Packages (e.g., Thin Small Outline Package [TSOP], Ball Grid Array [BGA], Plastic Dual In-line Package [PDIPD assembled and reworked with lead-free alloys Packages (e.g., TSOP, BGA, PDIP) assembled and reworked with mixed (lead/lead-free) alloys.

  2. Documenting Fine-Sediment Import and Export for Two Contrasting Mesotidal Flats

    DTIC Science & Technology

    2010-09-30

    muds, no thick or extensive mud deposits have been found buried within the tidal flats. Thin (~1-2 cm) lamine are found in vibracores (Fig. 3), and...studies (by Ogston), tidal reworking of the flat is documented to resuspend regularly the upper 2-3 cm of the flat surface and consequently wash out most...projects. Those studying the seabed incorporate radiochemical and textural data to document the processes (e.g., physical reworking , bioturbation

  3. Technology Requirements and Development for Affordable High-Temperature Distributed Engine Controls

    DTIC Science & Technology

    2012-06-04

    not lend itself to rework . This section focuses on the need to change from the ceramic module with “brazed” parts, to a more conventional PWB...technology that uses more conventional form of soldering. Ceramic brazed modules are expensive, brittle, and difficult to manufacture and rework ...High Temp extreme) Low Temp extreme Delta Temperature (worst case) Conventional PWB are typically built using laminate materials manufactured by

  4. Total Quality Management Guide. A Two Volume Guide for Defense Organizations. Volume 1. Key Features of the DoD Implementation

    DTIC Science & Technology

    1990-02-15

    inefficiency, cost growth, Total Quality %anagement waste , repair and rework. It lacked the necessary emphasis on building quality into every process that...culture of the DoD establishment, its contractors and their principal subcontractors. TQM is not just another program. TQM seeks to raise a collective ...Strategy 0 Reduce Chronic Waste CUMULATIVEMATERIAL * SCRAP * EXCESS INVENTORY PEOPLE’S TIME * INSPECTION -REWORK EQUIPMENT INSPECT!ON LOST SALES • TEST

  5. A Prolog Implementation of Pattern Search to Optimize Software Quality Assurance

    DTIC Science & Technology

    1990-03-01

    interact with the outside environment. - Inference Engine --uses deductive reasoning to drive the system towards a conclusion. - Knowledge Base...reverse engineering , and case tools have all lead to improvements in the production of software. Yet, the research community credited with these...34detected" errors are then passed to the rework sector for correction. Any "undetected" errors, that escape QA and rework, filter through to the testing

  6. Lightweight Tool Grinds Back-Side Weld Beads

    NASA Technical Reports Server (NTRS)

    Gallagher, Robert L.

    1994-01-01

    Air-powered grinder enables high-quality rework of welds. Tool removes excess material from back side of weld in preparation for reworking. Used on workpiece while workpiece still mounted in welding fixture or welding machine. Then rewelded in original position, so full process control maintained. Used for grinding material in spaces to which access limited, such as in pressure vessels and in hulls of ships. Also used to grind materials other than metals.

  7. Fossils out of sequence: Computer simulations and strategies for dealing with stratigraphic disorder

    SciTech Connect

    Cutler, A.H.; Flessa, K.W. )

    1990-06-01

    Microstratigraphic resolution is limited by vertical mixing and reworking of fossils. Stratigraphic disorder is the degree to which fossils within a stratigraphic sequence are not in proper chronological order. Stratigraphic disorder arises through in situ vertical mixing of fossils and reworking of older fossils into younger deposits. The authors simulated the effects of mixing and reworking by simple computer models, and measured stratigraphic disorder using rank correlation between age and stratigraphic position (Spearman and Kendall coefficients). Mixing was simulated by randomly transposing pairs of adjacent fossils in a sequence. Reworking was simulated by randomly inserting older fossils into a younger sequence. Mixing is an inefficient means of producing disorder; after 500 mixing steps stratigraphic order is still significant at the 99% to 95% level, depending on the coefficient used. Reworking disorders sequences very efficiently: significant order begins to be lost when reworked shells make up 35% of the sequence. Thus a sequence can be dominated by undisturbed, autochthonous shells and still be disordered. The effects of mixing-produced disorder can be minimized by increasing sample size at each horizon. Increased spacing between samples is of limited utility in dealing with disordered sequences: while widely separated samples are more likely to be stratigraphically ordered, the smaller number of samples makes the detection of trends problematic.

  8. A change in the geodynamics of continental growth 3 billion years ago.

    PubMed

    Dhuime, Bruno; Hawkesworth, Chris J; Cawood, Peter A; Storey, Craig D

    2012-03-16

    Models for the growth of continental crust rely on knowing the balance between the generation of new crust and the reworking of old crust throughout Earth's history. The oxygen isotopic composition of zircons, for which uranium-lead and hafnium isotopic data provide age constraints, is a key archive of crustal reworking. We identified systematic variations in hafnium and oxygen isotopes in zircons of different ages that reveal the relative proportions of reworked crust and of new crust through time. Growth of continental crust appears to have been a continuous process, albeit at variable rates. A marked decrease in the rate of crustal growth at ~3 billion years ago may be linked to the onset of subduction-driven plate tectonics.

  9. The role of the Asian monsoon in controlling erosion, weathering and the flux of sediment to the ocean

    NASA Astrophysics Data System (ADS)

    Clift, Peter

    2013-04-01

    The summer monsoon dominates the rainfall of South and SE Asia and is anticipated to be the primary control on continental erosion and weathering during the Quaternary when tectonic processes do not vary significantly except at local scales. Periods of strong monsoon generally correlate with interglacial, sealevel highstands. Such periods are recognized as times of enhanced reworking of stored sediment from flood plains or fluvial terraces within mountains, resulting in fast sedimentation being recorded in delta systems. Rising sealevels usually prevent large sediment volumes being reworked on to the continental slope, but what is deposited during periods of intensifying monsoon is more altered than sediment deposited prior to that time. In the South China Sea sedimentation on to the slope is largely driven by reworking of older weathered materials from the shelf, rather than directly from productive sources, such as Taiwan. Enhanced reworking is only curtailed by rising sealevels drowning the continental slope and shifting erosion further back onshore. While hotter, wetter conditions favor faster chemical weathering, the more weathered nature of sediment deposited at that time represents reworking of older stored sediment, not an immediate response to changing environmental conditions. New OSL dates from the Indus Basin support the idea of valley filling during time of strengthening monsoon followed by subsequent incision and reworking. Landslide damming caused by heavy summer rains may be a dominant process in this sediment buffering process, which results in lag times between initial erosion and delivery to the ocean on the order of 5-15 k.y. for finer grained sediment and potentially longer for dense detrital phases, such as zircon. Recognizing these lags is important when correlating marine erosion records with terrestrial climate records derived from lakes or caves if we are to understand the response of landscape to climate change.

  10. Dynamic monitoring of avalanches and barchan dune morphology change at different timescales

    NASA Astrophysics Data System (ADS)

    Nield, Joanna; Wiggs, Giles; Baddock, Matthew; Hipondoka, Martin

    2016-04-01

    Aeolian dune morphology responds dynamically to changing wind conditions. The lee slope avalanche dynamics of dunes are particularly sensitive to prior morphological conditions as well as the varying intensity and duration characteristics of sand transport events. Here we use terrestrial laser scanning (TLS) to measure dune surface change over minutes, hours, a week and a year during conditions of variable approach flow resulting in considerable lee slope reworking. Several different avalanche patterns are recognised that can be related to slope characteristics, wind direction and slope reworking. We find that during oblique winds, horn reworking can reduce the lee slope angle. When the dominant, formative winds of the barchan return, the reworked lee slope, perpendicular to the prior oblique wind, takes longer to start avalanching. In the central region of the dune, avalanche frequency and the extent of lee slope reworking depends on wind speed. Under high winds from the dominant direction, there is continual erosion near the dune brink central area, due to the exceedance of a critical angle of repose, whilst under weaker winds the frequency of grainfall sedimentation and avalanches diminishes and net deposition in the brink area is more common. During the week of measurements, changes to the crest-brink area and lee slope form are considerable, based on the reworking of the slope by avalanche events, and this ultimately influences the dune migration rate. Over the course of a year, we demonstrate that the shape of the barchan stoss and lee slopes can change significantly, whilst the overall dune size and general planform is maintained. Our findings help elucidate dune mobility mechanics and pattern modifications at the wind storm event scale.

  11. Delidding and resealing hybrid microelectronic packages

    NASA Astrophysics Data System (ADS)

    Luce, W. F.

    1982-05-01

    The objective of this single phase MM and T contract was to develop the manufacturing technology necessary for the precision removal (delidding) and replacement (resealing) of covers on hermetically sealed hybrid microelectronic packages. The equipment and processes developed provide a rework technique which does not degrade the reliability of the package of the enclosed circuitry. A qualification test was conducted on 88 functional hybrid packages, with excellent results. A petition will be filed, accompanied by this report, requesting Mil-M-38510 be amended to allow this rework method.

  12. Pain, sympathy and the medical encounter between the mid eighteenth and the mid twentieth centuries.

    PubMed

    Bourke, Joanna

    2012-08-01

    Witnessing people in pain inevitably elicits anxiety in physicians and other caregivers. Physicians are often required to inflict certain types of discomforts in order to alleviate other, more destructive, pains. Accusations that physicians lacked sympathy can be heard throughout the centuries. This article explores the diverse medical responses to such claims between the eighteenth and twentieth centuries. It interrogates changing definitions of clinical sympathy. The concept of sympathy was continually being reworked for each generation of medical professional. Crucially, in this reworking, philosophers (such as Adam Smith) and physicians came into dialogue. Cultures of sympathy were understood in both physiological and metaphorical terms, and were tied to changing notions of professionalization.

  13. Pain, sympathy and the medical encounter between the mid eighteenth and the mid twentieth centuries

    PubMed Central

    Bourke, Joanna

    2014-01-01

    Witnessing people in pain inevitably elicits anxiety in physicians and other caregivers. Physicians are often required to inflict certain types of discomforts in order to alleviate other, more destructive, pains. Accusations that physicians lacked sympathy can be heard throughout the centuries. This article explores the diverse medical responses to such claims between the eighteenth and twentieth centuries. It interrogates changing definitions of clinical sympathy. The concept of sympathy was continually being reworked for each generation of medical professional. Crucially, in this reworking, philosophers (such as Adam Smith) and physicians came into dialogue. Cultures of sympathy were understood in both physiological and metaphorical terms, and were tied to changing notions of professionalization PMID:24489439

  14. How Reuse Influences Productivity in Object-Oriented Systems

    NASA Technical Reports Server (NTRS)

    Basili, Victor R.; Briand, Lionel C.; Melo, Walcelio L.

    1997-01-01

    Although reuse is assumed to be especially valuable in building high quality software as well as in Object Oriented (OO) development, limited empirical evidence connects reuse with productivity and quality gains. The author's eight system study begins to define such benefits in an OO framework, most notably in terms of reduce defect density and rework as well as in increased productivity.

  15. Developing a Network of and for Geometric Reasoning

    ERIC Educational Resources Information Center

    Mamolo, Ami; Ruttenberg-Rozen, Robyn; Whiteley, Walter

    2015-01-01

    In this article, we develop a theoretical model for restructuring mathematical tasks, usually considered advanced, with a network of spatial visual representations designed to support geometric reasoning for learners of disparate ages, stages, strengths, and preparation. Through our geometric reworking of the well-known "open box…

  16. 30 CFR 256.72 - Compensatory payments as production.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... Section 256.72 Mineral Resources BUREAU OF OCEAN ENERGY MANAGEMENT, REGULATION, AND ENFORCEMENT, DEPARTMENT OF THE INTERIOR OFFSHORE LEASING OF SULPHUR OR OIL AND GAS IN THE OUTER CONTINENTAL SHELF... or gas in paying quantities or by other approved drilling or reworking operations, such...

  17. 30 CFR 556.37 - Lease term.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... Resources BUREAU OF OCEAN ENERGY MANAGEMENT, DEPARTMENT OF THE INTERIOR OFFSHORE LEASING OF SULPHUR OR OIL... or gas is produced from the lease in paying quantities, or drilling or well reworking operations as... and so long thereafter as sulphur is produced from the leasehold in paying quantities, or...

  18. 30 CFR 556.68 - Effect of assignment of a particular tract.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ....68 Section 556.68 Mineral Resources BUREAU OF OCEAN ENERGY MANAGEMENT, DEPARTMENT OF THE INTERIOR OFFSHORE LEASING OF SULPHUR OR OIL AND GAS IN THE OUTER CONTINENTAL SHELF Assignments, Transfers, and... drilling or well reworking operations as approved by the Secretary are conducted. (c) For those...

  19. 30 CFR 556.37 - Lease term.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... Resources BUREAU OF OCEAN ENERGY MANAGEMENT, DEPARTMENT OF THE INTERIOR OFFSHORE LEASING OF SULPHUR OR OIL... or gas is produced from the lease in paying quantities, or drilling or well reworking operations as... and so long thereafter as sulphur is produced from the leasehold in paying quantities, or...

  20. 30 CFR 556.72 - Compensatory payments as production.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 30 Mineral Resources 2 2012-07-01 2012-07-01 false Compensatory payments as production. 556.72 Section 556.72 Mineral Resources BUREAU OF OCEAN ENERGY MANAGEMENT, DEPARTMENT OF THE INTERIOR OFFSHORE... or by other approved drilling or reworking operations, such payments shall be considered as...

  1. 30 CFR 556.68 - Effect of assignment of a particular tract.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ....68 Section 556.68 Mineral Resources BUREAU OF OCEAN ENERGY MANAGEMENT, DEPARTMENT OF THE INTERIOR OFFSHORE LEASING OF SULPHUR OR OIL AND GAS IN THE OUTER CONTINENTAL SHELF Assignments, Transfers, and... drilling or well reworking operations as approved by the Secretary are conducted. (c) For those...

  2. 30 CFR 556.72 - Compensatory payments as production.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 30 Mineral Resources 2 2014-07-01 2014-07-01 false Compensatory payments as production. 556.72 Section 556.72 Mineral Resources BUREAU OF OCEAN ENERGY MANAGEMENT, DEPARTMENT OF THE INTERIOR OFFSHORE... or by other approved drilling or reworking operations, such payments shall be considered as...

  3. 30 CFR 556.72 - Compensatory payments as production.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 30 Mineral Resources 2 2013-07-01 2013-07-01 false Compensatory payments as production. 556.72 Section 556.72 Mineral Resources BUREAU OF OCEAN ENERGY MANAGEMENT, DEPARTMENT OF THE INTERIOR OFFSHORE... or by other approved drilling or reworking operations, such payments shall be considered as...

  4. 30 CFR 556.68 - Effect of assignment of a particular tract.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ....68 Section 556.68 Mineral Resources BUREAU OF OCEAN ENERGY MANAGEMENT, DEPARTMENT OF THE INTERIOR OFFSHORE LEASING OF SULPHUR OR OIL AND GAS IN THE OUTER CONTINENTAL SHELF Assignments, Transfers, and... drilling or well reworking operations as approved by the Secretary are conducted. (c) For those...

  5. 30 CFR 556.37 - Lease term.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... Resources BUREAU OF OCEAN ENERGY MANAGEMENT, DEPARTMENT OF THE INTERIOR OFFSHORE LEASING OF SULPHUR OR OIL... or gas is produced from the lease in paying quantities, or drilling or well reworking operations as... and so long thereafter as sulphur is produced from the leasehold in paying quantities, or...

  6. Measures of Success: Cruel Optimism and the Paradox of Academic Women's Participation in Australian Higher Education

    ERIC Educational Resources Information Center

    Lipton, Briony

    2017-01-01

    This paper examines the reworking of gender in the measured university and the impact this has on gender equality in academia. Neoliberal market rationalities and measurements embedded in academic publishing, funding and promotion have transformed Australian higher education and impacts upon the careers of academic women in ways that are gendered.…

  7. 77 FR 32064 - Airworthiness Directives; The Boeing Company Model 747 Airplanes

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-05-31

    ... fittings for corrosion, and rework if necessary; and ultrasonic inspections for cracks of the outboard end... reports of corrosion damage to the end fittings of the WLG support beams, and one report of subsequent... outboard end fitting of the left and right WLG support beams for cracks and corrosion, and...

  8. 77 FR 60891 - Airworthiness Directives; The Boeing Company Airplanes

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-10-05

    ...) beam outboard end fittings for corrosion, and rework if necessary; and ultrasonic inspections for... beams for cracks and corrosion, and corrective actions if necessary. This AD was prompted by new reports of corrosion damage to the end fittings of the WLG support beams, and one report of...

  9. "Cirque du Freak."

    ERIC Educational Resources Information Center

    Rivett, Miriam

    2002-01-01

    Considers the marketing strategies that underpin the success of the "Cirque du Freak" series. Describes how "Cirque du Freak" is an account of events in the life of schoolboy Darren Shan. Notes that it is another reworking of the vampire narrative, a sub-genre of horror writing that has proved highly popular with both adult and…

  10. Hybrid Doctoral Program: Innovative Practices and Partnerships

    ERIC Educational Resources Information Center

    Alvich, Dori; Manning, JoAnn; McCormick, Kathy; Campbell, Robert

    2012-01-01

    This paper reflects on how one mid-Atlantic University innovatively incorporated technology into the development of a hybrid doctoral program in educational leadership. The paper describes a hybrid doctoral degree program using a rigorous design; challenges of reworking a traditional syllabus of record to a hybrid doctoral program; the perceptions…

  11. "Without Contraries Is No Progression": Dust as an All-Inclusive, Multifunctional Metaphor in Philip Pullman's "His Dark Materials."

    ERIC Educational Resources Information Center

    Bird, Anne-Marie

    2001-01-01

    Draws on Milton's "Paradise Lost" and on motifs found within Gnostic mythology and the poetry of William Blake to explore how Philip Pullman reworks the Judeo-Christian myth of the Fall in his trilogy, "His Dark Materials." Finds at its center "Dust": a conventional metaphor for human physicality in which good and evil, and spirit and matter…

  12. Removing Bonded Integrated Circuits From Boards

    NASA Technical Reports Server (NTRS)

    Rice, John T.

    1989-01-01

    Small resistance heater makes it easier, faster, and cheaper to remove integrated circuit from hybrid-circuit board, package, or other substrate for rework. Heater, located directly in polymeric bond interface or on substrate under integrated-circuit chip, energized when necessary to remove chip. Heat generated softens adhesive or solder that bonds chip to substrate. Chip then lifted easily from substrate.

  13. Race Moves: Following Global Manifestations of New Racisms in Intimate Space

    ERIC Educational Resources Information Center

    Mishra Tarc, Aparna

    2013-01-01

    This article makes tentative links between abstract global forces and the affective and material reworking of race in intimate spaces of culture and community. Using postcolonial and psychoanalytic resources the article follows enduring manifestations of race as racism surfaces and is mobilized through global shifts of people, ideas and capital.…

  14. 170. GENERAL VIEW DOWN WASP STREET. VIEW SOUTHSOUTHEAST DOWN WASP ...

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

    170. GENERAL VIEW DOWN WASP STREET. VIEW SOUTH-SOUTHEAST DOWN WASP ST. FROM 4TH AVE. SHOWING, FROM LEFT TO RIGHT, BUILDING D-180, 60 (AIR REWORK FACILITY), 458, 419, 418, 416, AND 19-20. - Quonset Point Naval Air Station, Roger Williams Way, North Kingstown, Washington County, RI

  15. Designing an Australian Indigenous Studies Curriculum for the Twenty-First Century: Nakata's "Cultural Interface", Standpoints and Working beyond Binaries

    ERIC Educational Resources Information Center

    Carey, Michelle; Prince, Michael

    2015-01-01

    We discuss the recent reworking of Murdoch University's Australian Indigenous Studies major. For the discipline to realise its charter of decolonising knowledges about Indigenous peoples, it is necessary to move Indigenous Studies beyond the standard reversalist and unsustainable tropes that valorise romanticised notions of Indigeneity and…

  16. Electrochemical Machining Removes Deep Obstructions

    NASA Technical Reports Server (NTRS)

    Catania, Mark J.

    1987-01-01

    Electrochemical machining (ECM) is effective way of removing obstructing material between two deep holes supposed to intersect but do not because of misalignment of drilling tools. ECM makes it possible to rework costly castings otherwise scrapped. Method fast even for tough or hard alloys and complicated three-dimensional shapes.

  17. Research Teaching and Learning in Higher Education. Staff and Educational Development Series.

    ERIC Educational Resources Information Center

    Smith, Brenda, Ed.; Brown, Sally, Ed.

    This collection of 18 essays are based on sessions and keynote speeches at the Staff and Educational Development Association (SEDA) Conference held at Dyffrwn House, Cardiff (Wales) in November 1993. They represent the reworked and distilled thoughts of the presenters after they had had the experience of leading a workshop on a related topic. The…

  18. Tales of Recombinant Femininity: "The Reincarnation of Golden Lotus," the "Chin P'ing Mei," and the Politics of Melodrama in Hong Kong.

    ERIC Educational Resources Information Center

    Fore, Steve

    1993-01-01

    Examines the film "The Reincarnation of Golden Lotus" and the text upon which it is loosely based, the "Chin P'ing Mei," and the relationship between it and modern Chinese culture. States that the film's screenplay is much less an adaptation of the source novel than it is a female-centered reworking of a particular narrative…

  19. Evaluation of Organizational Self-Assessment Tools and Methodologies to Measure Continuous Process Improvement for the Naval Aviation Enterprise

    DTIC Science & Technology

    2006-09-01

    Mapping Process Example (From Deputy Secretary of Defense, 2006).............................................................................51 Figure 10...with the goal of creating value. “Waste” has many examples , especially in manufacturing, but the concepts are also applicable to service...organizations. Activities that absorb resources but create no value are examples of waste, i.e., mistakes requiring fixing or rework, production of unneeded

  20. Action Research and the Assemblage: Engaging Deleuzian Pedagogy and Inquiry beyond the Constraints of the Individual and the Group in Education Settings

    ERIC Educational Resources Information Center

    Gale, Ken

    2014-01-01

    Drawing upon the author's previous attempts to engage the work of Deleuze and Deleuze and Guattari with contemporary pedagogic practices and research, this paper offers a conceptually tentative reworking of the theory and practice of action research, both as a means of challenging antecedent positions and as a way of proposing a volatile and…

  1. Fabricated Childhoods: Uncanny Encounters with the More-than-Human

    ERIC Educational Resources Information Center

    Blaise, Mindy

    2016-01-01

    This article is based on uncanny encounters with Julia deVille's exhibit, "Phantasmagoria". Inspired by Deleuzian-informed research practices, the author experiments with provoking practices to defy dominant developmental notions of childhood. This article reworks a humanist ontology by bringing together the discursive, the material, the…

  2. NPS CubeSat Launcher Design, Process and Requirements

    DTIC Science & Technology

    2009-06-01

    Lithography (SLA) • Laminated Object Manufacturing • Electron Beam Melting Each of these technologies varies dramatically by materials used, price...Like many engineering projects there are often re-designs or mistakes requiring rework , so it was impractical to plan on building only ten P-POD

  3. Analysis and Testing of a Tapered End Connection for Laser Welded Steel Sandwich Panels

    DTIC Science & Technology

    2009-08-15

    reduced distortion lessens or eliminates the need for straightening and rework . Cost-effective, and weight efficient designs are the result. As with...Structural Engineering Vol 67, pp. 159-166. 26. Vel, S.S., Caccese, V., Zhao.,H, 2005, Elastic coupling effects in tapered sandwich panels with laminated

  4. Department of the Defense Agency Financial Report for Fiscal Year 2009

    DTIC Science & Technology

    2009-11-16

    effectiveness, enhanced personnel safety/security, reduced likelihood of loss of funds or erroneous payments, less rework , and better cost visibility and...Joint Contingency Contracting Handbook that provides essential tools (critical action checklists, laminated foldout charts, etc.) and training for

  5. Preliminary evaluation of hermetic JT/LJT/R P connector socket contact design

    SciTech Connect

    Baca, J.R.F.

    1991-10-01

    This report presents a precursory examination of a number of issues pertaining to socket contacts in hermetic connectors. The principal issues addressed are high-contact resistance and contact chatter (circuit discontinuities). Efforts examining the characteristics of the existing socket contact design, the possibility of connector/contact rework, quick-fix solutions, and contact redesigns are summarized.

  6. Showdown Shapes Up Over Pollution Laws

    ERIC Educational Resources Information Center

    Chemical and Engineering News, 1974

    1974-01-01

    Discusses technological, legislative, and administrative problems facing the implementation of the 1972 air and water pollution control acts. Indicates that a congressional reworking on the pollution laws appears to be in the offing which could lead to a softening of environmental deadlines and a change in spending for pollution controls. (CC)

  7. Developing a Network of and for Geometric Reasoning

    ERIC Educational Resources Information Center

    Mamolo, Ami; Ruttenberg-Rozen, Robyn; Whiteley, Walter

    2015-01-01

    In this article, we develop a theoretical model for restructuring mathematical tasks, usually considered advanced, with a network of spatial visual representations designed to support geometric reasoning for learners of disparate ages, stages, strengths, and preparation. Through our geometric reworking of the well-known "open box…

  8. Effects of bioturbation on seagrasses: Implications for management and restoration

    EPA Science Inventory

    Marine and estuarine fauna can diminish or enhance seagrass condition simply as a result of their burrowing, excavating, re-working, and feeding activities (e.g., bioturbation). We present the first comprehensive review of the effects of bioturbators on seagrasses and associated ...

  9. Fabricated Childhoods: Uncanny Encounters with the More-than-Human

    ERIC Educational Resources Information Center

    Blaise, Mindy

    2016-01-01

    This article is based on uncanny encounters with Julia deVille's exhibit, "Phantasmagoria". Inspired by Deleuzian-informed research practices, the author experiments with provoking practices to defy dominant developmental notions of childhood. This article reworks a humanist ontology by bringing together the discursive, the material, the…

  10. The Implicit Construction of "Children at Risk": On the Dynamics of Practice and Programme in Development Screenings in Early Childhood

    ERIC Educational Resources Information Center

    Bollig, Sabine; Kelle, Helga

    2013-01-01

    This article presents findings from an ethnographic study on preventive paediatric check-ups in Germany. In accordance with system-theoretical and governmentality approaches (referencing Foucault), preventive check-ups are conceptualised as fields where risk concepts related to children's development are applied, produced and reworked. In order to…

  11. A GENERATIVE SKETCH OF BURMESE.

    ERIC Educational Resources Information Center

    BURLING, ROBBINS

    ASSUMING THAT A GENERATIVE APPROACH PROVIDES A FAIRLY DIRECT AND SIMPLE DESCRIPTION OF LINGUISTIC DATA, THE AUTHOR TAKES A TRADITIONAL BURMESE GRAMMAR (W. CORNYN'S "OUTLINE OF BURMESE GRAMMAR," REFERRED TO AS OBG THROUGHOUT THE PAPER) AND REWORKS IT INTO A GENERATIVE FRAMEWORK BASED ON A MODEL BY CHOMSKY. THE STUDY IS DIVIDED INTO FIVE SECTIONS,…

  12. Race Moves: Following Global Manifestations of New Racisms in Intimate Space

    ERIC Educational Resources Information Center

    Mishra Tarc, Aparna

    2013-01-01

    This article makes tentative links between abstract global forces and the affective and material reworking of race in intimate spaces of culture and community. Using postcolonial and psychoanalytic resources the article follows enduring manifestations of race as racism surfaces and is mobilized through global shifts of people, ideas and capital.…

  13. FIPSE Interactive Physics Project (October 1989-August 1993). Final Report.

    ERIC Educational Resources Information Center

    Laws, Priscilla W.; Thornton, Ronald K.

    This project focused on encouraging instructors at large universities to take advantage of the curricular materials and computer tools developed for two related programs funded originally by FIPSE. In particular, it involved reworking and integrating materials developed for the previously funded Workshop Physics and Tools for Scientific Thinking…

  14. Developing and Validating Test Items for First-Year Computer Science Courses

    ERIC Educational Resources Information Center

    Vahrenhold, Jan; Paul, Wolfgang

    2014-01-01

    We report on the development, validation, and implementation of a collection of test items designed to detect misconceptions related to first-year computer science courses. To this end, we reworked the development scheme proposed by Almstrum et al. ("SIGCSE Bulletin" 38(4):132-145, 2006) to include students' artifacts and to…

  15. Braze/Rebraze process for CRES steel

    NASA Technical Reports Server (NTRS)

    Silverman, C. E.

    1976-01-01

    Using induction brazing process with 8.5-Au/16.5-Cu/2.0-Ni braze alloy, joints in 21-6-9 CRES steel tubing can be reworked up to seven times, thus significantly reducing cost of fabrication, repair, and part replacement.

  16. Technology's Impact on the Creative Potential of Youth

    ERIC Educational Resources Information Center

    Rubin, Jim

    2012-01-01

    The importance of educating students to think critically and creatively was recognized over 2,000 years ago by Socrates, reworked in the 1950s by Benjamin Bloom, and reinforced by many modern-day educators. With changes in lifestyle brought on by innovations in digital technology, teachers, administrators, and parents alike are questioning the…

  17. Standpoints: Researching and Teaching English in the Digital Dimension

    ERIC Educational Resources Information Center

    Kirkland, David E.

    2009-01-01

    David E. Kirkland argues that our understanding of literate practice in relation to space needs to be radically reworked to account for new digital dimensions that are dispersed, discontinuous, and yet deeply woven into everyday and institutional worlds. His account highlights the way these digital spaces pepper the official landscape of…

  18. 30 CFR 256.72 - Compensatory payments as production.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 30 Mineral Resources 2 2010-07-01 2010-07-01 false Compensatory payments as production. 256.72....72 Compensatory payments as production. If an oil and gas lessee makes compensatory payments and if... by other approved drilling or reworking operations, such payments shall be considered as the...

  19. Teaching the Topography of Gretel Ehrlich's Grammar.

    ERIC Educational Resources Information Center

    Gessell, Donna A.

    When writing, few students have any concept that word placement affects the content of their writing. They seldom rework their papers at the sentence level in order to assure that their grammar reflects and enhances their content. Recognizing the relationship of grammar to meaning, composition researchers are reasserting the place of grammar in…

  20. Creating the New Profession: The Human Services

    ERIC Educational Resources Information Center

    Sunderland, Stephen C.

    1975-01-01

    A demand is issued for the establishment of a new profession of human services, outlining its assumptions based on a client/consumer/citizen model of service delivery. The reworking of cherished myths concerning concepts of unique professional knowledge, practictioner autonomy, and ideal models of service are illustrated with examples drawn from…

  1. Global Education Inc.: New Policy Networks and the Neoliberal Imaginary

    ERIC Educational Resources Information Center

    Ball, Stephen J.

    2012-01-01

    Do private and philanthropic solutions to the problems of education signal the end of state education in its "welfare" form? Education policy is being reformed and re-worked on a global scale. Policies are flowing and converging to produce a singular vision of "best practice" based on the methods and tenets of the "neo-liberal imaginary".…

  2. Laser geodynamic satellite thermal/optical/vibrational analyses and testing, volume 2, book 1 technical report. [retroreflector performance

    NASA Technical Reports Server (NTRS)

    1975-01-01

    The results are presented of a retroreflector performance improvement program. The following areas of the program are discussed: retroreflector dimensional verification, initial optical performance analysis, LAGEOS test retroreflector rework, final optical performance analysis, optical performance tests, evaluations and conclusions, and laser wavelength evaluation and dihedral angle selection. Data tables, diagrams, graphs, and photographs are included.

  3. How Reuse Influences Productivity in Object-Oriented Systems

    NASA Technical Reports Server (NTRS)

    Basili, Victor R.; Briand, Lionel C.; Melo, Walcelio L.

    1997-01-01

    Although reuse is assumed to be especially valuable in building high quality software as well as in Object Oriented (OO) development, limited empirical evidence connects reuse with productivity and quality gains. The author's eight system study begins to define such benefits in an OO framework, most notably in terms of reduce defect density and rework as well as in increased productivity.

  4. A SYSTEM FOR THE DEVELOPMENT OF SPEAKING IN THE TEACHING OF RUSSIAN TO FOREIGNERS.

    ERIC Educational Resources Information Center

    BITEKHTIN, G.A.; BOCKMAN, JOHN F.

    WHILE EVERY OTHER ASPECT OF LANGUAGE TEACHING IS TODAY SUBORDINATE TO THE DEVELOPMENT OF SPEAKING, PROBLEMS WILL DEVELOP UNLESS THERE IS AN ESSENTIAL REWORKING OF METHODOLOGY AND AN ESTABLISHMENT OF A SYSTEM FOR DEVELOPING EFFECTIVE ORAL FACILITY. CONSCIOUSNESS OF GRAMMATICAL PHENOMENA IS INDISPENSABLE FOR RAPID MASTERY OF SPOKEN RUSSIAN. THE…

  5. Expansion of Discovery of Sound in the Sea (DOSITS) Content and Outreach FY11-FY12

    DTIC Science & Technology

    2012-09-30

    management system • Reworked navigation issue: Decreased the length and number of subtitles within DOSITS 2. Maintain and develop the Discovery of...Licensing • Addition of scientific names to DOSITS: added scientific names to DOSITS within the structure available through the website’s content

  6. Quality Management for Educational Technology Services: A Guide to Application of the Deming Management Method for District, University and Regional Media and Technology Centers.

    ERIC Educational Resources Information Center

    Richie, Mark L.

    This book shows how the quality management approach pioneered in Japan by Dr. W. Edwards Deming allows educational service centers to expand services and be more flexible by reducing waste and rework. Deming's method shows how to change from reactive management to a dynamic system of continuous improvement that restores worker pride, increases…

  7. 75 FR 13682 - Airworthiness Directives; Bombardier, Inc. Model DHC-8-400 Series Airplanes

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-03-23

    ... and a rework of the weight on wheel (WOW) proximity sensor cover to provide clearance for the re... exist or develop on other products of the same type design. Differences Between This AD and the MCAI or... (WOW) proximity sensor cover to provide clearance for the re-oriented retention bolt. Actions...

  8. New Tales for Old: Folktales as Literary Fictions for Young Adults.

    ERIC Educational Resources Information Center

    de Vos, Gail; Altmann, Anna E.

    Focusing on reworkings of tales from the European oral folk tradition, this book shows educators how to use these tales effectively in the high school and middle school curriculum. The first chapter of the book, "Folktales and Literary Fictions" looks at the nature of folktales, their place in contemporary North American culture, and the…

  9. Records as Genre.

    ERIC Educational Resources Information Center

    Schryer, Catherine F.

    1993-01-01

    Reworks the concept of genre from rhetorical, dialectical, and dialogic perspectives. Redefines genre as a stabilized-for-now site of social and ideological action. Applies this definition (in a six-month ethnographic study) to a specific literary practice--medical record keeping--evolving in a specific context--a veterinary college. (SR)

  10. Adorno and the Borders of Experience: The Significance of the Nonidentical for a "Different" Theory of "Bildung"

    ERIC Educational Resources Information Center

    Thompson, Christiane

    2006-01-01

    In this essay Christiane Thompson discusses the systematic outcomes of Theodor Adorno's philosophical work for a reworked theory of "Bildung" (an important term in the German tradition of philosophy and history of education). In his essay "Theory of 'Halbbildung,'" Adorno revealed the inevitable failure of "Bildung,"…

  11. The Learning-Focused Transformation of Biology and Physics Core Courses at the U.S. Air Force Academy

    ERIC Educational Resources Information Center

    Sagendorf, Kenneth; Noyd, Robert K.; Morris, D. Brent

    2009-01-01

    An institution-wide focus on deep learning has made significant changes in the biology and physics core course curriculum at the U.S. Air Force Academy. The biology course director has reworked course objectives to reflect the learning-focused approach to teaching, while the physics curriculum has adopted new learning outcomes and ways to…

  12. Accounts receivable cash management: it all happens at the point-of-service.

    PubMed

    Hajny, T

    2000-01-01

    If your accounts receivable is not generating the cash your practice needs in a timely and effective manner, look first at your front-end processes. Nine times out of ten, this is where the system is failing. The improvements suggested here will not only generate cash quicker, but also will enhance customer service and lower overall costs by reducing the need for rework.

  13. Research Teaching and Learning in Higher Education. Staff and Educational Development Series.

    ERIC Educational Resources Information Center

    Smith, Brenda, Ed.; Brown, Sally, Ed.

    This collection of 18 essays are based on sessions and keynote speeches at the Staff and Educational Development Association (SEDA) Conference held at Dyffrwn House, Cardiff (Wales) in November 1993. They represent the reworked and distilled thoughts of the presenters after they had had the experience of leading a workshop on a related topic. The…

  14. Grinding Away Microfissures

    NASA Technical Reports Server (NTRS)

    Booth, Gary N.; Malinzak, R. Michael

    1990-01-01

    Treatment similar to dental polishing used to remove microfissures from metal parts without reworking adjacent surfaces. Any variety of abrasive tips attached to small motor used to grind spot treated. Configuration of grinding head must be compatible with configurations of motor and workpiece. Devised to eliminate spurious marks on welded parts.

  15. The Living and the Dead in Education: Commentary on Julian Williams

    ERIC Educational Resources Information Center

    Jones, Peter E.

    2011-01-01

    Jean Lave and Ray McDermott (2002) did a service with their powerful reading of Marx's 1844 essay on "Estranged Labour" (Marx, 1964). In reworking Marx's critique of "alienated labour" in terms of "alienated learning," they reminded everyone of Marx's own impassioned revolt against the inhumanity of the capitalist order and found a novel way of…

  16. Exploring Collective Mathematical Creativity in Elementary School

    ERIC Educational Resources Information Center

    Levenson, Esther

    2011-01-01

    This study combines theories related to collective learning and theories related to mathematical creativity to investigate the notion of collective mathematical creativity in elementary school classrooms. Collective learning takes place when mathematical ideas and actions, initially stemming from an individual, are built upon and reworked,…

  17. Showdown Shapes Up Over Pollution Laws

    ERIC Educational Resources Information Center

    Chemical and Engineering News, 1974

    1974-01-01

    Discusses technological, legislative, and administrative problems facing the implementation of the 1972 air and water pollution control acts. Indicates that a congressional reworking on the pollution laws appears to be in the offing which could lead to a softening of environmental deadlines and a change in spending for pollution controls. (CC)

  18. 26 CFR 1.263A-8 - Requirement to capitalize interest.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... must include anticipated expense and time for delay, rework, change orders, and technological, design... equipment, grain storage bins and silos. For purposes of this section, affixation to real property may be... essentially an item of machinery or equipment is not an inherently permanent structure and is not real...

  19. Educational Renovation in a South African "Township on the Move": A Social-Spatial Analysis

    ERIC Educational Resources Information Center

    Fataar, Aslam

    2007-01-01

    This article presents an account of the ways education reform has been mediated in one South African township. It suggests that the normative policy intentions of the reforming post-apartheid state have been reworked in light of the specific social configuration of the township and its schools. It employs social-spatial lenses to understand the…

  20. "Without Contraries Is No Progression": Dust as an All-Inclusive, Multifunctional Metaphor in Philip Pullman's "His Dark Materials."

    ERIC Educational Resources Information Center

    Bird, Anne-Marie

    2001-01-01

    Draws on Milton's "Paradise Lost" and on motifs found within Gnostic mythology and the poetry of William Blake to explore how Philip Pullman reworks the Judeo-Christian myth of the Fall in his trilogy, "His Dark Materials." Finds at its center "Dust": a conventional metaphor for human physicality in which good and evil, and spirit and matter…

  1. Designing an Australian Indigenous Studies Curriculum for the Twenty-First Century: Nakata's "Cultural Interface", Standpoints and Working beyond Binaries

    ERIC Educational Resources Information Center

    Carey, Michelle; Prince, Michael

    2015-01-01

    We discuss the recent reworking of Murdoch University's Australian Indigenous Studies major. For the discipline to realise its charter of decolonising knowledges about Indigenous peoples, it is necessary to move Indigenous Studies beyond the standard reversalist and unsustainable tropes that valorise romanticised notions of Indigeneity and…

  2. Turbine blade root design concept promises superior alignment

    NASA Technical Reports Server (NTRS)

    King, O. D.

    1966-01-01

    Blade-to-hub mounting concept assures excellent alignment integrity and results in elimination of some welding problems associated with designs. With this design, if rework is required, blade removal and replacement may be readily accomplished without damage to blade positioning media on the wheel hub.

  3. 40 CFR 63.759 - Implementation and enforcement.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... (CONTINUED) NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS FOR SOURCE CATEGORIES (CONTINUED) National Emission Standards for Aerospace Manufacturing and Rework Facilities § 63.759 Implementation and... authority to a State, local, or Tribal agency, then that agency, in addition to the U.S. EPA, has the...

  4. 40 CFR 63.759 - Implementation and enforcement.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... (CONTINUED) NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS FOR SOURCE CATEGORIES (CONTINUED) National Emission Standards for Aerospace Manufacturing and Rework Facilities § 63.759 Implementation and... authority to a State, local, or Tribal agency, then that agency, in addition to the U.S. EPA, has the...

  5. How Does Education Support the Formation and Establishment of Individual Identities?

    ERIC Educational Resources Information Center

    Latchem, Johannah

    2006-01-01

    This article examines how education could support the formation and establishment of identities. It focuses on museum education and in particular artist interrogations of museum narratives. These interventions into museum pedagogy are critical reworkings of the presentation of cultural histories in dominant narratives. The aim of this research is…

  6. 75 FR 18446 - Airworthiness Directives; The Boeing Company Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-04-12

    ..., and 747SP Series Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice of..., and 747SP series airplanes. This proposed AD would require reworking or replacing certain duct... assemblies in the ECS with burned Boeing Material Specification (BMS) 8-39 polyurethane foam insulation....

  7. Dancing Composition: Pedagogy and Philosophy as Experience

    ERIC Educational Resources Information Center

    Gould, Elizabeth

    2006-01-01

    For philosopher Gilles Deleuze, the work of philosophy consists of affirmatively and artistically creating and reworking concepts in response to real-life problems in an ongoing process that invites new perspectives and ways of thinking. Carol Matthews's music composition pedagogical practices reflect these processes, arguing that they demonstrate…

  8. Alternative Ways of Expressing and Reading Identity

    ERIC Educational Resources Information Center

    Higgins, Jane; Nairn, Karen; Sligo, Judith

    2009-01-01

    This paper explores the use of an "anti-CV" (anti-Curriculum Vitae), or identity portfolio, as a data collection instrument in research with young people. We analyse four visually based anti-CVs created by participants in a project on youth transitions, exploring their use of symbolism and space to show how these young people reworked public…

  9. Braze/Rebraze process for CRES steel

    NASA Technical Reports Server (NTRS)

    Silverman, C. E.

    1976-01-01

    Using induction brazing process with 8.5-Au/16.5-Cu/2.0-Ni braze alloy, joints in 21-6-9 CRES steel tubing can be reworked up to seven times, thus significantly reducing cost of fabrication, repair, and part replacement.

  10. Women who lead.

    PubMed

    Silver, A L

    1996-03-01

    This essay reviews aspects of historical and cultural changes that now permit women increasing opportunities to lead both women and men. Women assuming leadership responsibilities undergo psychic reorganization, reworking their personal histories and their modes of interaction. The author challenges women who inhibit their leadership potential to scrutinize their attitudes and to consider the implications for the next generation of women.

  11. Georgia on Our Minds

    ERIC Educational Resources Information Center

    Skophammer, Karen

    2011-01-01

    Oil pastels offer many advantages. They come in a large range of hues, intensities and values, and they lend themselves to blending and shading in a unique way that no other art medium offers. They can be worked and reworked from day to day by the students without the large mess and cleanup time that oil paints require. An artist whose works are a…

  12. Irradiation stratigraphy and depositional history of the Apollo 16 double drive tube 60009/10

    NASA Technical Reports Server (NTRS)

    Blanford, G. E.; Blanford, J.; Hawkins, J. A.

    1979-01-01

    We report track density frequency distributions, the fraction of high density grains and minimum track densities for 63, 1 mm wide locations in the Apollo 16 double drive tube 60009/10. From these data we conclude that there are seven irradiation strata in the core. Only one buried reworking zone extending from 50-52 cm was found and it was exposed near the surface from 4.5-9 times 10 to the 6th y with a most probable exposure period of 6 times 10 to the 6th y. There is lack of conclusive data that this zone represents a reworking zone in which case the material below 52 cm most probably was exposed in situ for 4.5 times 10 to the 6th y and developed a reworking zone approximately less than 0.5 cm. The present surface of the core has a reworking zone of 12-13 cm which was exposed from 1.3 times 10 to the 7th to 2.5 times 10 to the 8th y. The best estimate for this exposure period remains the value of approximately less than 1.25 times 10 to the 8th y determined by Bogard and Hirsch (1976). The other strata in the core appear to contain mixtures of various soil types and are not related to in situ depositional events.

  13. Girlhood, Sexual Violence, and Agency in Francesca Lia Block's "Wolf"

    ERIC Educational Resources Information Center

    Marshall, Elizabeth

    2009-01-01

    This essay examines the representation of adolescent girlhood, sexual violence and agency in Francesca Lia Block's contemporary fairy tale collection "The Rose and The Beast." Focusing specifically on the tale "Wolf," the author provides a literary analysis of how Block draws on and reworks traditional Western fairy tale variants to reintroduce…

  14. Developing a New Computer Game Attitude Scale for Taiwanese Early Adolescents

    ERIC Educational Resources Information Center

    Liu, Eric Zhi-Feng; Lee, Chun-Yi; Chen, Jen-Huang

    2013-01-01

    With ever increasing exposure to computer games, gaining an understanding of the attitudes held by young adolescents toward such activities is crucial; however, few studies have provided scales with which to accomplish this. This study revisited the Computer Game Attitude Scale developed by Chappell and Taylor in 1997, reworking the overall…

  15. Mathematical and Computational Framework for Virtual Fabrication Environment for Aircraft Components

    DTIC Science & Technology

    2008-03-01

    computational aspects of a knowledge base needed for the creation of a virtual fabrication environment for aircraft components manufactured from 7050 ...T7451 aluminum plate stock so that the incidence of re-working and scrapping of partially or fully manufactured parts can be substantially reduced.

  16. Morphology and sedimentation on open-coast intertidal flats of the Changjiang Delta, China

    USGS Publications Warehouse

    Fan, D.; Li, C.; Wang, D.; Wang, P.; Archer, A.W.; Greb, S.F.

    2004-01-01

    On many intertidal flats, lateral aggradation and reworking by large tidal channels is the dominant sedimentary process. On the open-coast intertidal flats of the Changjiang Delta large laterally migrating tidal channels are absent. Instead, numerous shallow tidal creeks cut across the intertidal flats. On these flats, vertical rather than lateral migration dominates sedimentation. Observations over semidiurnal tidal cycles show that both flood and ebb tides have the potential to deposit their own mud-sand couplets, but four couplets per day are rarely preserved. Reworking by tidal currents and/or weak waves results in loss of tidal couplets or amalgamation of two or more thin couplets into a single thick couplet. Measurements of preserved couplets show that they can represent a single flooding or ebbing event (half day) to a period of several neap-spring cycles. Diastems within amalgamated couplets are generally not distinguishable. The key agent for reworking open-coast intertidal flat deposits is not tidal creek migration but seasonal storm waves. Seasonal storm deposits consist of a basal scour and sand-dominant laminae with mud pebbles, grading upward to mud-dominated layers of fair-weather deposits. Sand-dominated layers are also reworked.

  17. Georgia on Our Minds

    ERIC Educational Resources Information Center

    Skophammer, Karen

    2011-01-01

    Oil pastels offer many advantages. They come in a large range of hues, intensities and values, and they lend themselves to blending and shading in a unique way that no other art medium offers. They can be worked and reworked from day to day by the students without the large mess and cleanup time that oil paints require. An artist whose works are a…

  18. The Mosque Project: Collective Drawings

    ERIC Educational Resources Information Center

    Erwin, Douglas B.

    2013-01-01

    Teaching the author's fifth-graders about Islam through art was a challenge. Remembering a colleague's "Collective Architecture" project, he reworked the concept using mosque architecture as the basis for a new project. The goal was to introduce Islam and its basic tenets using the visual arts, with the hope of enhancing cultural tolerance and…

  19. "Cirque du Freak."

    ERIC Educational Resources Information Center

    Rivett, Miriam

    2002-01-01

    Considers the marketing strategies that underpin the success of the "Cirque du Freak" series. Describes how "Cirque du Freak" is an account of events in the life of schoolboy Darren Shan. Notes that it is another reworking of the vampire narrative, a sub-genre of horror writing that has proved highly popular with both adult and…

  20. Assessment of Robust Learning with Educational Data Mining

    ERIC Educational Resources Information Center

    Baker, Ryan S.; Corbett, Albert T.

    2014-01-01

    Many university leaders and faculty have the goal of promoting learning that connects across domains and prepares students with skills for their whole lives. However, as assessment emerges in higher education, many assessments focus on knowledge and skills that are specific to a single domain. Reworking assessment in higher education to focus on…

  1. Tales of Recombinant Femininity: "The Reincarnation of Golden Lotus," the "Chin P'ing Mei," and the Politics of Melodrama in Hong Kong.

    ERIC Educational Resources Information Center

    Fore, Steve

    1993-01-01

    Examines the film "The Reincarnation of Golden Lotus" and the text upon which it is loosely based, the "Chin P'ing Mei," and the relationship between it and modern Chinese culture. States that the film's screenplay is much less an adaptation of the source novel than it is a female-centered reworking of a particular narrative…

  2. 75 FR 16689 - Airworthiness Directives; Airbus Model A318, A319, A320, and A321 Series Airplanes

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-04-02

    ... investigation confirmed that the defects were a result of de-bonding between the skin and honeycomb core. An extended de-bonding, if not detected and corrected, may degrade the structural integrity of the rudder. The... reworked in production. The investigation confirmed that the defects were a result of de- bonding...

  3. Girlhood, Sexual Violence, and Agency in Francesca Lia Block's "Wolf"

    ERIC Educational Resources Information Center

    Marshall, Elizabeth

    2009-01-01

    This essay examines the representation of adolescent girlhood, sexual violence and agency in Francesca Lia Block's contemporary fairy tale collection "The Rose and The Beast." Focusing specifically on the tale "Wolf," the author provides a literary analysis of how Block draws on and reworks traditional Western fairy tale variants to reintroduce…

  4. Cultural Resources Management Plan: Coralville Lake, Iowa.

    DTIC Science & Technology

    1987-05-01

    burned and bulldozed remnants of a modern farm outbuilding. Neither site is eligible for the National *Register of Historic Places. No additional...FLOOOPLAIN LT- LOWt TERRACE MIXED LATERAL & VERTICLE ACCRETION DEPOSITS (LATE HOLOCENE) IT- INTERMEDIATE TERRACE- THIN (% IM) REWORKED EOLIAN

  5. The Mosque Project: Collective Drawings

    ERIC Educational Resources Information Center

    Erwin, Douglas B.

    2013-01-01

    Teaching the author's fifth-graders about Islam through art was a challenge. Remembering a colleague's "Collective Architecture" project, he reworked the concept using mosque architecture as the basis for a new project. The goal was to introduce Islam and its basic tenets using the visual arts, with the hope of enhancing cultural tolerance and…

  6. Schools, Discipline and Community: Diary-writing and Schoolgirl Culture in Late Nineteenth-Century France.

    ERIC Educational Resources Information Center

    Rogers, Rebecca

    1995-01-01

    Maintains that 19th-century French boarding school culture used the idea of community to transmit feminine but not necessarily domestic values. These included obedience, selflessness, and interdependence. Students, however, transformed and reworked these messages to fit their individual needs, as revealed by one young woman's diary. (MJP)

  7. "We Could Think of Things That Could Be Science": Girls' Re-Figuring of Science in an Out-Of-School-Time Club

    ERIC Educational Resources Information Center

    Gonsalves, Allison; Rahm, Jrène; Carvalho, Alice

    2013-01-01

    Grounded in sociocultural theory, this study explores how the figured world of science is reworked through a series of multi-media activities that were introduced into a girls-only conversation club in an after school program for Teens. The study is part of a multi-sited ethnography in which we explored youths' engagement with science within…

  8. 78 FR 22178 - Airworthiness Directives; The Boeing Company Airplanes

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-04-15

    ... was prompted by reports indicating that certain crew oxygen mask stowage box units were possibly... label certain crew oxygen mask stowage box units that have already been inspected and reworked by the supplier, and allows operators to install new or serviceable crew oxygen mask stowage box units,...

  9. Computer program for definition of transonic axial-flow compressor blade rows

    NASA Technical Reports Server (NTRS)

    Crouse, J. E.

    1975-01-01

    Particular type of blade element used has two segments which have centerlines and surfaces described by constant change of angle with path distance on cone. Program is result of rework of earlier program to give major gains in accuracy, reliability and speed. It also covers more steps of overall compressor design procedure.

  10. Electrochemical Machining Removes Deep Obstructions

    NASA Technical Reports Server (NTRS)

    Catania, Mark J.

    1987-01-01

    Electrochemical machining (ECM) is effective way of removing obstructing material between two deep holes supposed to intersect but do not because of misalignment of drilling tools. ECM makes it possible to rework costly castings otherwise scrapped. Method fast even for tough or hard alloys and complicated three-dimensional shapes.

  11. How States Can Promote Local Innovation, Options, and Problem-Solving in Public Education. Linking State and Local School Improvement

    ERIC Educational Resources Information Center

    Posamentier, Jordan; Lake, Robin; Hill, Paul

    2017-01-01

    State policy plays a critical role in determining whether and how well local education improvement strategies can be implemented. As states rework their education policies under the Every Student Succeeds Act (ESSA), state and local leaders need a way to assess their current policy environment and identify the changes needed to encourage local…

  12. Carbonate reservoirs at the Mesozoic-Tertiary unconformity, northeast Spain

    SciTech Connect

    Esteban, M.

    1988-08-01

    Carbonates at the Mesozoic-Tertiary unconformity in northeast Spain show four types/stages of evolution of reservoir properties: karstification, coastal reworking, Miocene organic buildups, and Pliocene burial. Subaerial exposure during Paleogene-early Miocene rifting developed a complex fracture-controlled paleokrast facies, showing up to three evolution levels with well-developed cavern and vuggy porosity (1). During the Miocene, the paleokrast profile was intensively reworked into a variety of breccias, conglomerates, and calcarenites in both alluvial and coastal depositional settings. Gravitational displacement of largely karstified hillsides was common. These reworked paleokarst deposits (2) present excellent reservoir properties. The Miocene formations onlap the karstified Mesozoic and the reworked facies; these formations include coral reefs and foramalgal buildups (3) with primary and secondary porosity. Finally, a late fracture event (attributed to the Pliocene) affected the buried and lithified paleokarst deposits and lower-middle Miocene formations (4). This fracture event is associated with vuggy corrosion, dolomitization, ore mineralization, and leaching of Mesozoic to middle Miocene carbonates. Several horizons with chalky microporosity are also tentatively related to this Pliocene event. These four phases of reservoir evolution are also recognized in northern Morocco and southern Italy.

  13. A Chance to Be Like Lance

    ERIC Educational Resources Information Center

    Prouty, Anne

    2004-01-01

    The authors' seventh-grade science curriculum includes a study of nutrition, anatomy, and physiology. Over several years, the authors' teaching partner and herself reworked the nine-week unit to include the Tour de France and the exploits of Lance Armstrong. What makes this unit so engaging for middle school students is that it provides an…

  14. A Chance to Be Like Lance

    ERIC Educational Resources Information Center

    Prouty, Anne

    2004-01-01

    The authors' seventh-grade science curriculum includes a study of nutrition, anatomy, and physiology. Over several years, the authors' teaching partner and herself reworked the nine-week unit to include the Tour de France and the exploits of Lance Armstrong. What makes this unit so engaging for middle school students is that it provides an…

  15. Effects of bioturbation on seagrasses: Implications for management and restoration

    EPA Science Inventory

    Marine and estuarine fauna can diminish or enhance seagrass condition simply as a result of their burrowing, excavating, re-working, and feeding activities (e.g., bioturbation). We present the first comprehensive review of the effects of bioturbators on seagrasses and associated ...

  16. 77 FR 58761 - Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Airplanes

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-09-24

    ... installing or reworking, as applicable, metallic diverters and aluminum sheets; modifying the light assembly... diverters and aluminum sheets; modifying the light assembly on the tail boom rear movable fairing; and... aluminum sheets; modify the light assembly on the tail boom rear movable fairing; and replace the...

  17. 7 CFR 29.3042 - No grade.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... 7 Agriculture 2 2014-01-01 2014-01-01 false No grade. 29.3042 Section 29.3042 Agriculture... INSPECTION Standards Official Standard Grades for Burley Tobacco (u.s. Type 31 and Foreign Type 93) § 29.3042 No grade. A designation applied to a lot of tobacco which is classified as offtype, rework, semicured...

  18. 7 CFR 29.3042 - No grade.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... 7 Agriculture 2 2013-01-01 2013-01-01 false No grade. 29.3042 Section 29.3042 Agriculture... INSPECTION Standards Official Standard Grades for Burley Tobacco (u.s. Type 31 and Foreign Type 93) § 29.3042 No grade. A designation applied to a lot of tobacco which is classified as offtype, rework, semicured...

  19. 7 CFR 29.3042 - No grade.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... 7 Agriculture 2 2011-01-01 2011-01-01 false No grade. 29.3042 Section 29.3042 Agriculture... INSPECTION Standards Official Standard Grades for Burley Tobacco (u.s. Type 31 and Foreign Type 93) § 29.3042 No grade. A designation applied to a lot of tobacco which is classified as offtype, rework, semicured...

  20. 7 CFR 29.3042 - No grade.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 7 Agriculture 2 2010-01-01 2010-01-01 false No grade. 29.3042 Section 29.3042 Agriculture... INSPECTION Standards Official Standard Grades for Burley Tobacco (u.s. Type 31 and Foreign Type 93) § 29.3042 No grade. A designation applied to a lot of tobacco which is classified as offtype, rework, semicured...

  1. 7 CFR 29.2284 - No grade.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... 7 Agriculture 2 2011-01-01 2011-01-01 false No grade. 29.2284 Section 29.2284 Agriculture... INSPECTION Standards Official Standard Grades for Virginia Fire-Cured Tobacco (u.s. Type 21) § 29.2284 No grade. A designation applied to a lot of tobacco classified as nested, offtype, rework, semicured, or...

  2. 7 CFR 29.2284 - No grade.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... 7 Agriculture 2 2013-01-01 2013-01-01 false No grade. 29.2284 Section 29.2284 Agriculture... INSPECTION Standards Official Standard Grades for Virginia Fire-Cured Tobacco (u.s. Type 21) § 29.2284 No grade. A designation applied to a lot of tobacco classified as nested, offtype, rework, semicured, or...

  3. 7 CFR 29.2284 - No grade.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... 7 Agriculture 2 2014-01-01 2014-01-01 false No grade. 29.2284 Section 29.2284 Agriculture... INSPECTION Standards Official Standard Grades for Virginia Fire-Cured Tobacco (u.s. Type 21) § 29.2284 No grade. A designation applied to a lot of tobacco classified as nested, offtype, rework, semicured, or...

  4. 7 CFR 29.2284 - No grade.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 7 Agriculture 2 2010-01-01 2010-01-01 false No grade. 29.2284 Section 29.2284 Agriculture... INSPECTION Standards Official Standard Grades for Virginia Fire-Cured Tobacco (u.s. Type 21) § 29.2284 No grade. A designation applied to a lot of tobacco classified as nested, offtype, rework, semicured, or...

  5. Developing and Validating Test Items for First-Year Computer Science Courses

    ERIC Educational Resources Information Center

    Vahrenhold, Jan; Paul, Wolfgang

    2014-01-01

    We report on the development, validation, and implementation of a collection of test items designed to detect misconceptions related to first-year computer science courses. To this end, we reworked the development scheme proposed by Almstrum et al. ("SIGCSE Bulletin" 38(4):132-145, 2006) to include students' artifacts and to…

  6. Measuring Quality, Framing What We Know: A Critical Discourse Analysis of the Common Inspection Framework

    ERIC Educational Resources Information Center

    Dennis, Carol

    2011-01-01

    In "Measuring quality: framing what we know" I offer a critique of "Success in Adult Literacy, Numeracy and ESOL provision (Success in ALNE)"--a contextualised reworking of the common inspection framework. This document offers a government-sponsored account of what quality means when applied to the teaching of adult language, literacy and…

  7. Action Research and the Assemblage: Engaging Deleuzian Pedagogy and Inquiry beyond the Constraints of the Individual and the Group in Education Settings

    ERIC Educational Resources Information Center

    Gale, Ken

    2014-01-01

    Drawing upon the author's previous attempts to engage the work of Deleuze and Deleuze and Guattari with contemporary pedagogic practices and research, this paper offers a conceptually tentative reworking of the theory and practice of action research, both as a means of challenging antecedent positions and as a way of proposing a volatile and…

  8. Goodbye to Camelot.

    ERIC Educational Resources Information Center

    Young, Carol C.

    1985-01-01

    Reviews Rosemary Sutcliffe's "The Sword and the Circle," a contemporary reworking of the Arthurian legend. Suggests that it fails by comparison with the versions of Tennyson and Malory because it depicts Arthur as a pawn of magicians rather than a duly elected leader working with his subjects to create a just society. (RBW)

  9. Technology's Impact on the Creative Potential of Youth

    ERIC Educational Resources Information Center

    Rubin, Jim

    2012-01-01

    The importance of educating students to think critically and creatively was recognized over 2,000 years ago by Socrates, reworked in the 1950s by Benjamin Bloom, and reinforced by many modern-day educators. With changes in lifestyle brought on by innovations in digital technology, teachers, administrators, and parents alike are questioning the…

  10. Imagination as a Vehicle for Comprehension Instruction

    ERIC Educational Resources Information Center

    Villarreal, Lorena A.

    2013-01-01

    Imagination has been described as a cognitive endeavor that serves as a catalyst for creative actions and aids in the development of comprehension skills. Studies show that incorporating imagination into classroom practice builds on children's lived experiences and encourages the creative reworking of elements that enable the generation of new…

  11. How Inconvenient Assumptions Affect Preservice Teachers' Uptake of New Interactional Patterns in Mathematics: Analysis and Aspiration through a Bifocal Lens

    ERIC Educational Resources Information Center

    Klein, Mary

    2012-01-01

    In this paper, I highlight the inadequacies of contemporary theoretical and philosophical orthodoxies to fully address pedagogic change. The required change is in mathematics education, and it has to do with enabling preservice teachers, upon graduation, to rework extant power relations in implementing new interactional patterns that centre the…

  12. Adorno and the Borders of Experience: The Significance of the Nonidentical for a "Different" Theory of "Bildung"

    ERIC Educational Resources Information Center

    Thompson, Christiane

    2006-01-01

    In this essay Christiane Thompson discusses the systematic outcomes of Theodor Adorno's philosophical work for a reworked theory of "Bildung" (an important term in the German tradition of philosophy and history of education). In his essay "Theory of 'Halbbildung,'" Adorno revealed the inevitable failure of "Bildung,"…

  13. Grinding Away Microfissures

    NASA Technical Reports Server (NTRS)

    Booth, Gary N.; Malinzak, R. Michael

    1990-01-01

    Treatment similar to dental polishing used to remove microfissures from metal parts without reworking adjacent surfaces. Any variety of abrasive tips attached to small motor used to grind spot treated. Configuration of grinding head must be compatible with configurations of motor and workpiece. Devised to eliminate spurious marks on welded parts.

  14. 77 FR 61542 - Airworthiness Directives; The Boeing Company Airplanes

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-10-10

    ... aft end of each inboard flap track of the wing outboard flap, and corrective actions, if necessary... attachments of each outboard flap, and corrective action, if necessary. That AD also requires, for certain... flange of the inboard track at the rear spar attachment of each outboard flap, and eventual rework of the...

  15. New 40Ar/39Ar laser single-grain ages of muscovites from mylonitic schists in the Rodna Mountains, Eastern Carpathians, Romania: correlations with microstructure

    NASA Astrophysics Data System (ADS)

    Culshaw, Nicholas; Mosonyi, Emilia; Reynolds, Peter

    2012-01-01

    The Rodna Mountains afford the most internal structural window into the crystalline units of the Eastern Carpathians in Romania. The Rodna Mountains consist of Variscan metamorphic nappes that were restacked in the Alpine phase of Carpathian development forming the Subbucovinian and Infrabucovinian nappes. In order to evaluate age of deformation, ten samples were taken from the zone of greenschist facies mylonitic schist that marks the Alpine tectonic boundary between the Subbucovinian and Infrabucovinian nappes and 40Ar/39Ar laser single-grain ages determined for schistosity-forming muscovite. Microstructural assessment of quartz and muscovite distinguished two deformation events. Single-grain ages from the microstructurally most strongly reworked samples (four samples) give a tight clustering of ages at ca. 95 Ma. The least reworked schists have a broader clustering of ages spanning ca. 200-280 Ma with a late Permian peak and some samples showing outlier ages in the range 200-100 Ma. The relative development of the outliers, which correlates with evidence for increased microstructural reworking, is interpreted to mark progressive isotopic resetting. The ca. 95 Ma ages for the most reworked schists are estimates for the age of the Alpine nappe stacking. The ca. 200-280 Ma ages are similar to those of magmatism, metamorphism, and sedimentation thought to mark post-Variscan-pre-Alpine rifting and ocean basin formation in parts of the Alps and may be the thermal imprint of a related event in the Eastern Carpathians.

  16. "We Could Think of Things That Could Be Science": Girls' Re-Figuring of Science in an Out-Of-School-Time Club

    ERIC Educational Resources Information Center

    Gonsalves, Allison; Rahm, Jrène; Carvalho, Alice

    2013-01-01

    Grounded in sociocultural theory, this study explores how the figured world of science is reworked through a series of multi-media activities that were introduced into a girls-only conversation club in an after school program for Teens. The study is part of a multi-sited ethnography in which we explored youths' engagement with science within…

  17. 40 CFR 63.742 - Definitions.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... means any facility that produces, reworks, or repairs in any amount any commercial, civil, or military... that: (1) Is large enough and so configured that an employee can bodily enter and perform assigned work... (GA) means that segment of civil aviation that encompasses all facets of aviation except air carriers...

  18. Government Projects and Teaching the Technical Proposal.

    ERIC Educational Resources Information Center

    Butler, Douglas R.

    1987-01-01

    Describes a technical proposal writing assignment modeled after the conditions in industry. Provides a paradigm of government project proposals and then outlines the stages of the assignment that allow student to rework and revise, thereby discouraging students from writing formulaic and superficial proposals. (SRT)

  19. The Nervous System.

    ERIC Educational Resources Information Center

    Miller, Richard E.

    1996-01-01

    Attempts to step outside the debate about personal writing in academic discourse and rework its configurations. Suggests that academics think anew about writing as a place where the personal and the academic, the private and the public, the individual and the institutional, are always inextricably interwoven. (TB)

  20. Making Learning Happen: Strategies for an Interactive Classroom.

    ERIC Educational Resources Information Center

    Golub, Jeffrey N.

    This is a book about "conscious learning," the kind of learning that enables students to assess the current level and quality of their language performance and then work to improve that performance deliberately, enthusiastically, and with commitment. The book takes complex, sophisticated understandings and reworks them into ready-to-use…

  1. Spinning New Tales from Traditional Texts: Donna Jo Napoli and the Rewriting of Fairy Tale.

    ERIC Educational Resources Information Center

    Crew, Hilary S.

    2002-01-01

    Demonstrates how Donna Jo Napoli changes generic conventions and reworks discursive formations in order to retell tradition tales. Discusses the narrative strategies she uses in telling her stories, her representation of male and female characters in regard to gender and gendered relationships, and the way she renegotiates ideologies and value…

  2. A Task Group Practitioner's Response to Waldo and Bauman's Article on Regrouping the Categorization of Group Work.

    ERIC Educational Resources Information Center

    Keel, Linda P.

    1998-01-01

    Argues that Waldo and Bauman's Goals and Process (GAP) matrix does not include task/work groups. Claims that it is not in the best interest of group work to undo or rework the Association for Specialists in Group Work's four core groups as a model. States that the field of group work needs a commonly shared framework/categorization from which to…

  3. More Than Pushing a Broom

    ERIC Educational Resources Information Center

    Ward, James E.

    1976-01-01

    A course in building maintenance (at the Voc Tech Department of Pensacola Junior College, Florida) teaches students to maintain, repair, and rework existing facilities under the CETA program. The daily schedule includes one hour of classroom work covering related academic subjects and five hours spent working on a variety of projects. (LH)

  4. Missed Opportunities: The Subordination of Children in Philip Pullman's "His Dark Materials"

    ERIC Educational Resources Information Center

    Moruzi, Kristine

    2005-01-01

    In the "His Dark Materials" trilogy, Pullman reworks the fall of humanity into an ascent and suggests that ascent into adulthood through sexual experience is the desired goal for children. Although this ascent is accompanied by a radical reconceptualization of life and death, Pullman fails to offer any genuinely new ideas of the world with respect…

  5. Introducing Social Stratification and Inequality: An Active Learning Technique.

    ERIC Educational Resources Information Center

    McCammon, Lucy

    1999-01-01

    Summarizes literature on techniques for teaching social stratification. Describes the three parts of an exercise that enables students to understand economic and political inequality: students are given a family scenario, create household budgets, and finally rework the national budget with their family scenario groups. Discusses student…

  6. New Beginnings: Ensuring Quality Bilingual/ESL Instruction in New York City Public Schools. Executive Summary [and] Report of the Chancellor's Bilingual/ESL Education Practitioners' Workgroup and Policy/Research Panels.

    ERIC Educational Resources Information Center

    New York City Board of Education, Brooklyn, NY. Office of Bilingual Education.

    The report presents a conceptual framework and related strategies designed to help policymakers and practitioners re-examine, and when necessary, rework the basic assumptions and practices defining the educational experiences of bilingual/English-as-a-Second-Language (ESL) learners in New York City (New York) public schools. The report consists of…

  7. How Inconvenient Assumptions Affect Preservice Teachers' Uptake of New Interactional Patterns in Mathematics: Analysis and Aspiration through a Bifocal Lens

    ERIC Educational Resources Information Center

    Klein, Mary

    2012-01-01

    In this paper, I highlight the inadequacies of contemporary theoretical and philosophical orthodoxies to fully address pedagogic change. The required change is in mathematics education, and it has to do with enabling preservice teachers, upon graduation, to rework extant power relations in implementing new interactional patterns that centre the…

  8. For all the right reasons. Approaching CPOE from a patient safety and care quality perspective is the first critical step toward success.

    PubMed

    Hagland, Mark

    2009-09-01

    True CPOE success is about facilitating improved patient safety, care quality, and efficiency in a multidisciplinar environment, and on an ongoing basis. CPOE implementation forces clinician leaders to examine and rework long-ingrained care delivery processes, especially as they build or adapt order sets. The likelihood that CPOE will be a requirement of meaningful use could compel a rapid acceleration in implementation.

  9. ITEM RESPONSE ANALYSES OF THE EDUCATIONAL OPPORTUNITIES SURVEY 9TH GRADE STUDENT QUESTIONNAIRE.

    ERIC Educational Resources Information Center

    WEINFELD, FREDERIC D.; AND OTHERS

    THIS REPORT PRESENTS THE ANALYSIS OF QUESTIONNAIRE ITEM RESPONSES FROM THE NINTH-GRADE STUDENT QUESTIONNAIRE ADMINISTERED AS PART OF THE EDUCATIONAL OPPORTUNITIES SURVEY. THE ANALYSES WERE PERFORMED TO DOCUMENT SOME OF THE BASIC DATA FROM THE SURVEY, TO MAKE THEM AVAILABLE TO INTERESTED EDUCATIONAL RESEARCHERS, AND TO REWORK THE BASIC DATA FOR…

  10. Cowboys and Indians: Perceptions of Western Films among American Indians and Anglos.

    ERIC Educational Resources Information Center

    Shively, JoEllen

    1992-01-01

    Presents the results of a study of how minorities participate in and rework the central myths of the dominant culture. The responses of 20 Anglo White males versus 20 American Indian males to a western film showed that the meaning imputed to cultural works varies over social space. (JB)

  11. Dancing a Story: Myth and Movement for Children.

    ERIC Educational Resources Information Center

    Swaim, Salome

    1997-01-01

    Outlines a method of storytelling and movement whereby the teacher tells a story and the children rework and dance the story. Describes supporting scholarly and philosophical concepts; classic myths of many cultures are noted as most appropriate for this process. Suggests that this method enhances cognitive function, stimulates imagination,…

  12. Records as Genre.

    ERIC Educational Resources Information Center

    Schryer, Catherine F.

    1993-01-01

    Reworks the concept of genre from rhetorical, dialectical, and dialogic perspectives. Redefines genre as a stabilized-for-now site of social and ideological action. Applies this definition (in a six-month ethnographic study) to a specific literary practice--medical record keeping--evolving in a specific context--a veterinary college. (SR)

  13. Writing (for) Survival: Continuity and Change in Four Contemporary Native American Women's Autobiographies.

    ERIC Educational Resources Information Center

    de Hernandez, J. Browdy

    1994-01-01

    Reviews four autobiographical texts by Native American women: "Talking Indian: Reflections on Survival and Writing" (Anna Lee Walters), "Storyteller" (Leslie Marmon Silko), "The Ways of My Grandmothers" (Beverly Hungry Wolf), and "Saanii Dahataal/The Women Are Singing" (Lucy Tapahonso). All rework the…

  14. Teaching the Topography of Gretel Ehrlich's Grammar.

    ERIC Educational Resources Information Center

    Gessell, Donna A.

    When writing, few students have any concept that word placement affects the content of their writing. They seldom rework their papers at the sentence level in order to assure that their grammar reflects and enhances their content. Recognizing the relationship of grammar to meaning, composition researchers are reasserting the place of grammar in…

  15. The Nuts and Bolts of USMC Fasteners

    DTIC Science & Technology

    2012-08-28

    Dry Film Thickness – Torque-Tension – Porosity • Develop better process to procure fasteners in the USMC ...despite the fact that they were of the recommended “brand.” • The investigation and subsequent reworking of these vehicles was expensive

  16. Coating Requirements & Projects for USMC Vehicles (Briefing Charts)

    DTIC Science & Technology

    2011-02-08

    be inspected for surface imperfections, total film thickness and adhesion. The minimum dry film thickness (DFT) shall be the sum of the minimum...Database Review Overall Design Document Programming Phase Design and Usability Review Modifications / Redesigns Design and Usability Review 2 Modifications and Reworks Final Product Release X

  17. 262. SENIOR OFFICER'S QUARTERS A, 194041. GEORGE A FULLER AND ...

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

    262. SENIOR OFFICER'S QUARTERS A, 1940-41. GEORGE A FULLER AND CO., DESIGNERS OF THE REWORKING OF A C. 1939 SUMMER COTTAGE INTO THIS NEOCOLONIAL RESIDENCE--THE LARGEST AND FOCAL ELEMENT IN THE SENIOR OFFICERS HOUSING AREA. VIEW FROM THE WEST SHOWING THE ENTRANCE ELEVATION OF QUARTERS A. - Quonset Point Naval Air Station, Roger Williams Way, North Kingstown, Washington County, RI

  18. 77 FR 52270 - Airworthiness Directives; Agusta S.p.A. Helicopters

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-08-29

    ... assembly and two main rotor (M/R) blades. This proposed AD would require reworking or replacing the top cable-cutter assembly to increase clearance between the WSPS and the M/ R blades. The proposed AD actions are intended to prevent damage to the M/R blades and subsequent loss of helicopter control....

  19. Global Education Inc.: New Policy Networks and the Neoliberal Imaginary

    ERIC Educational Resources Information Center

    Ball, Stephen J.

    2012-01-01

    Do private and philanthropic solutions to the problems of education signal the end of state education in its "welfare" form? Education policy is being reformed and re-worked on a global scale. Policies are flowing and converging to produce a singular vision of "best practice" based on the methods and tenets of the "neo-liberal imaginary".…

  20. Developing a New Computer Game Attitude Scale for Taiwanese Early Adolescents

    ERIC Educational Resources Information Center

    Liu, Eric Zhi-Feng; Lee, Chun-Yi; Chen, Jen-Huang

    2013-01-01

    With ever increasing exposure to computer games, gaining an understanding of the attitudes held by young adolescents toward such activities is crucial; however, few studies have provided scales with which to accomplish this. This study revisited the Computer Game Attitude Scale developed by Chappell and Taylor in 1997, reworking the overall…

  1. The Living and the Dead in Education: Commentary on Julian Williams

    ERIC Educational Resources Information Center

    Jones, Peter E.

    2011-01-01

    Jean Lave and Ray McDermott (2002) did a service with their powerful reading of Marx's 1844 essay on "Estranged Labour" (Marx, 1964). In reworking Marx's critique of "alienated labour" in terms of "alienated learning," they reminded everyone of Marx's own impassioned revolt against the inhumanity of the capitalist order and found a novel way of…

  2. Indianapolis Plan Suggests Blueprint for Other Districts

    ERIC Educational Resources Information Center

    Samuels, Christina A.

    2012-01-01

    An Indianapolis-based nonprofit organization has crafted a sweeping plan for reworking the 33,000-student Indianapolis school system that would place the district under the control of the city's mayor, pare down the money spent in central administration, and give principals broad authority to hire and fire teachers. The reform plan created by the…

  3. "People in Stockholm Are Smarter than Countryside Folks"--Reproducing Urban and Rural Imaginaries in Film and Life

    ERIC Educational Resources Information Center

    Eriksson, Madeleine

    2010-01-01

    This article explores the celebrated film "The Hunters" (Swedish title: "Jagarna") within the context of the discourse of "Internal Orientalism." By juxtaposing a contemporary Swedish film with historical accounts and contemporary news media, I demonstrate how the film reworks and (re)produces representations of the…

  4. Dancing Composition: Pedagogy and Philosophy as Experience

    ERIC Educational Resources Information Center

    Gould, Elizabeth

    2006-01-01

    For philosopher Gilles Deleuze, the work of philosophy consists of affirmatively and artistically creating and reworking concepts in response to real-life problems in an ongoing process that invites new perspectives and ways of thinking. Carol Matthews's music composition pedagogical practices reflect these processes, arguing that they demonstrate…

  5. Hybrid Doctoral Program: Innovative Practices and Partnerships

    ERIC Educational Resources Information Center

    Alvich, Dori; Manning, JoAnn; McCormick, Kathy; Campbell, Robert

    2012-01-01

    This paper reflects on how one mid-Atlantic University innovatively incorporated technology into the development of a hybrid doctoral program in educational leadership. The paper describes a hybrid doctoral degree program using a rigorous design; challenges of reworking a traditional syllabus of record to a hybrid doctoral program; the perceptions…

  6. Total Quality development of Material Control Accountability software: LANMAS

    SciTech Connect

    Woychick, M.R.; Yearsley, D.; McRae, L.P.

    1993-07-01

    Changing US Department of Energy (DOE) guidelines require Material Control & Accountability (MC&A) software to meet Total Quality certification requirements. Some MC&A software has met site quality standards, but only after extensive documentation rework. Mandating Total Quality methods during development virtually guarantees MC&A software certification.

  7. Measuring Quality, Framing What We Know: A Critical Discourse Analysis of the Common Inspection Framework

    ERIC Educational Resources Information Center

    Dennis, Carol

    2011-01-01

    In "Measuring quality: framing what we know" I offer a critique of "Success in Adult Literacy, Numeracy and ESOL provision (Success in ALNE)"--a contextualised reworking of the common inspection framework. This document offers a government-sponsored account of what quality means when applied to the teaching of adult language, literacy and…

  8. CH Stands for Cheese, Right? A Swiss Culture Class and the National Standards

    ERIC Educational Resources Information Center

    Seidlitz, Lisa

    2012-01-01

    Culture has always been a part of foreign language learning. However, in recent years, more and more language professors advocate placing culture at the center of our classes. The question of just how to teach culture remains a topic of debate. This paper describes the reworking of a traditional German grammar and reading course into a class that…

  9. The Quest for Holism in Education for Sustainable Development.

    ERIC Educational Resources Information Center

    Stables, Andrew; Scott, William

    2002-01-01

    Sustainable development can remain a regulative ideal for environmental educators with the acknowledgement that it has no absolute legitimation and that human reflexivity remains capable of reworking the cultural traditions that have shaped it. Claims that the quest for holism remains one voice in a continuing dialogue about the environment and…

  10. Indianapolis Plan Suggests Blueprint for Other Districts

    ERIC Educational Resources Information Center

    Samuels, Christina A.

    2012-01-01

    An Indianapolis-based nonprofit organization has crafted a sweeping plan for reworking the 33,000-student Indianapolis school system that would place the district under the control of the city's mayor, pare down the money spent in central administration, and give principals broad authority to hire and fire teachers. The reform plan created by the…

  11. Cultivating Disruptive Subjectivities: Interrupting the New Professionalism

    ERIC Educational Resources Information Center

    Herr, Kathryn

    2015-01-01

    This paper explores the everyday enactments of new public management in our professional lives utilizing principles of self-ethnography. Drawing on the reworking of an Action Research class, I explore the possibilities of a contextual analysis of the workplace to make more transparent the enactment of new public management. Little is known…

  12. A Jester's Guide to Creative See[k]ing across Disciplines

    ERIC Educational Resources Information Center

    Rosen, Diane

    2012-01-01

    For many centuries and in many cultures, jesters recited tales of heroic exploits, but they did more than simply recount past events--they amused, cajoled, and spun tales that transported listeners to the edge of mysterious, unmapped territories. Through the transformative power of play and the imagination, they reworked what was already…

  13. 16 CFR 1115.20 - Voluntary remedial actions.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... a document, signed by a subject firm, which sets forth the remedial action which the firm will... has been taken to eliminate the alleged substantial product hazard. The firm should indicate whether... returned to a subject firm, the corrective action plan should indicate their disposition (e.g., reworked...

  14. Advanced manufacturing development of a composite empennage component for L-1011 aircraft. Phase 4: Full scale ground test

    NASA Technical Reports Server (NTRS)

    Jackson, A. C.; Dorwald, F.

    1982-01-01

    The ground tests conducted on the advanced composite vertical fin (ACVF) program are described. The design and fabrication of the test fixture and the transition structure, static test of Ground Test Article (GTA) No. 1, rework of GTA No. 2, and static, damage tolerance, fail-safe and residual strength tests of GTA No. 2 are described.

  15. The Business Case for Systems Engineering Study: Detailed Response Data

    DTIC Science & Technology

    2012-11-01

    customers Subject matter experts to monitor supplier development TPMs16, KPPs Trend data for getting work accomplished System maturity User evaluations...reports, defect detection profiles, work product inspections, QA18 assessments, discrepancy report data , rework measures) Customer measures... customer comments, work product acceptance / rejection data , formal and informal customer satisfaction inquiries, customer evaluation of SE efforts

  16. 30 CFR 250.1151 - How often must I conduct well production tests?

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... obtained. This must be submitted within 45 days after the end of the calendar half-year. (b) You may... reworked well completions within 30 days of the date of first continuous production, Form BSEE-0126, Well Potential Test Report, along with the supporting data as listed in the table in § 250.1167, within 15 days...

  17. 30 CFR 250.1151 - How often must I conduct well production tests?

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... obtained. This must be submitted within 45 days after the end of the calendar half-year. (b) You may... reworked well completions within 30 days of the date of first continuous production, Form BSEE-0126, Well Potential Test Report, along with the supporting data as listed in the table in § 250.1167, within 15 days...

  18. 30 CFR 250.1151 - How often must I conduct well production tests?

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... obtained. This must be submitted within 45 days after the end of the calendar half-year. (b) You may... reworked well completions within 30 days of the date of first continuous production, Form BSEE-0126, Well Potential Test Report, along with the supporting data as listed in the table in § 250.1167, within 15 days...

  19. "People in Stockholm Are Smarter than Countryside Folks"--Reproducing Urban and Rural Imaginaries in Film and Life

    ERIC Educational Resources Information Center

    Eriksson, Madeleine

    2010-01-01

    This article explores the celebrated film "The Hunters" (Swedish title: "Jagarna") within the context of the discourse of "Internal Orientalism." By juxtaposing a contemporary Swedish film with historical accounts and contemporary news media, I demonstrate how the film reworks and (re)produces representations of the…

  20. The Implicit Construction of "Children at Risk": On the Dynamics of Practice and Programme in Development Screenings in Early Childhood

    ERIC Educational Resources Information Center

    Bollig, Sabine; Kelle, Helga

    2013-01-01

    This article presents findings from an ethnographic study on preventive paediatric check-ups in Germany. In accordance with system-theoretical and governmentality approaches (referencing Foucault), preventive check-ups are conceptualised as fields where risk concepts related to children's development are applied, produced and reworked. In order to…

  1. 77 FR 5730 - Airworthiness Directives; Bombardier, Inc. Airplanes

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-02-06

    ... inspection of the main landing gear (MLG) shock strut assemblies for part and serial numbers; for certain MLG shock strut assemblies, a one-time inspection of the torque link apex joint, and corrective actions if necessary; and, for certain MLG shock strut assemblies, replacement or rework of the apex nut. Since we...

  2. The Learning-Focused Transformation of Biology and Physics Core Courses at the U.S. Air Force Academy

    ERIC Educational Resources Information Center

    Sagendorf, Kenneth; Noyd, Robert K.; Morris, D. Brent

    2009-01-01

    An institution-wide focus on deep learning has made significant changes in the biology and physics core course curriculum at the U.S. Air Force Academy. The biology course director has reworked course objectives to reflect the learning-focused approach to teaching, while the physics curriculum has adopted new learning outcomes and ways to…

  3. CH Stands for Cheese, Right? A Swiss Culture Class and the National Standards

    ERIC Educational Resources Information Center

    Seidlitz, Lisa

    2012-01-01

    Culture has always been a part of foreign language learning. However, in recent years, more and more language professors advocate placing culture at the center of our classes. The question of just how to teach culture remains a topic of debate. This paper describes the reworking of a traditional German grammar and reading course into a class that…

  4. THR ROLE OF SEABED DYNAMICS IN STRUCTURING A MESOHALINE MACROBENTIC INFAUNAL COMMUNITY

    EPA Science Inventory

    Estuaries are dynamic physical environments. The stability of the sediment-water interface is influenced by sources and rates of sediment delivery and reworking of sediments by currents, tides, waves and biology, but effects of disruption of this interface on benthic biology are...

  5. Burrow-generated false facies and phantom sequences

    SciTech Connect

    Wanless, H.R.; Tagett, M.

    1986-05-01

    Callianassa (=Ophiomorpha) and other burrowers deeply rework shallow marine sequences. Through in-situ reworking, they create false sedimentary facies and stratigraphic sequences. Callianassa's key to effectiveness is that it expels sand and mud from burrow excavations but concentrates coarse material at the base of the burrow complex. Coarse material can be derived by falling into the burrow entrance, by reworking the existing sediment sequence, or by a combination of both. Examples come from shallow marine carbonate environments of south Florida and the Turks and Caicos Islands, British West Indies. Many mudbanks in south Florida are formed as stacks of layered mudstone units 20-100 cm thick. Between events, seagrasses may recolonize, and a burrowing benthic community may repopulate the substrate. The layered mudstone beneath older areas of mudbank flats can gradually be converted to a bioturbated skeletal wackestone by the deep burrowing community. Burrowing also causes mixing of faunal assemblages. On Caicos Bank, an extensive carbonate tidal flat (3-4 m thick) is slowly being transgressed. About 1 m of tidal-flat sequence is eroded at the shoreline. The remaining 2-3 m could be preserved as part of the transgressive sequence. Callianassa burrowing, however, quickly reworks the sequence, replacing tidal-flat sands and muds with marine peloidal and skeletal sediment. Within 100 m of the shoreline, the only evidence of the tidal-flat sequence is a concentration of high-spired gastropods in Calliannassa burrows at the base of the Holocene sequence and a few patches of tidal-flat sediment that burrowers missed. What looks like a basal transgressive lag is in fact a biogenic concentrate from in-situ reworking of a now phantom sequence.

  6. Diamonds from the Espinhaço Range (Minas Gerais, Brazil) and their redistribution through the geologic record

    NASA Astrophysics Data System (ADS)

    Chaves, M. L. S. C.; Karfunkel, J.; Hoppe, A.; Hoover, D. B.

    2001-07-01

    Diamond-bearing deposits from the Espinhaço Range are associated with three distinct periods in the geologic record. During a Precambrian magmatic period (≥1.75 Ga), diamondiferous rocks were introduced into the crust; the location of these rocks remains an enigma. During a second period, diamonds were eroded from the primary rocks and deposited in the Mesoproterozoic Espinhaço basin (≅1.75-1.70 Ga), where several generations of reworking and diagenisis are suggested. The third period is the Phanerozoic, during which several more episodes of reworking occurred. The first was during the Eocretaceous uplift of the range, when Precambrian conglomerates were partially eroded and diamonds redeposited in fluvial systems. These deposits have little economic significance because of overlying Tertiary laterites. Renewed upheaval at the Neogene formed diamondiferous fanglomeratic deposits as a result of the pronounced relief. Quaternary climate cycling developed colluvial deposits on earlier formed occurrences. Fanglomeratic and colluvial deposits are worked where the adjacent Proterozoic or Cretaceous sources produced widespread diamond-bearing gravels. Finally, recent river systems have reworked all the earlier sources to produce economic gravels in some places. Although these recent gravels are low grade, they are a major diamond source because of the large reserves. The mineralogical characteristics of these diamonds reflect the long history and repeated reworking of the source deposits, and the geologic history of the region points towards an extra-basinal source area, probably to the west within the São Francisco Craton. This repeated reworking has resulted in a natural selection of the diamonds that eliminated low-quality stones in the journey to their final resting place.

  7. Mass-wasting triggered by the end-Triassic mass-extinction

    NASA Astrophysics Data System (ADS)

    van de Schootbrugge, Bas; Vecoli, Marco; Strother, Paul; Lindstrom, Sofie; Oschmann, Wolfgang

    2014-05-01

    The end-Triassic dieback of tree-forming vegetation across NW Europe and the proliferation of a low-growing herbaceous pioneer vegetation composed of ferns and fern allies, likely had a major impact on weathering and erosion of emerged land masses. In a recently drilled core from northern Germany (Schandelah), palynological analyses provide evidence for this scenario. The uppermost Rhaetian Triletes Beds show increasing amounts of reworked Palaeozoic acritarchs and prasinophytes of up to 30% of the palynomorph fraction. Most of the acritarchs are singletons and can be assigned to Ordovician and Silurian species, such as Ankyrotrochus crispum, Oppilatala eoplanktonica, and Evittia spp. The average age of the reworked acritarch assemblages is observed to increase during the latest Rhaetian, leading to an inverted stratigraphy among Palaeozoic species. Further North, in the Stenlille cores from the Danish Basin, reworked Palaeozoic palynomorphs appear to constitute mainly sphaeromorphic prasinophytes and other Palaeozoic microfossils such as chitinozoans and carboniferous spores. Further south, at Mingolsheim (S Germany) the Triletes Beds contain a clear sign of soil reworking, including mycorrhizal fungal remains and cysts from probable soil organisms. These peculiar changes in palynological assemblages go hand-in-hand with important changes in sedimentology. The reworking of soil and bedrock is occurring in an interval that also contains evidence for earthquake activity in the form of widespread seismites. All these observations may be attributed to a number of mutually non-exclusive mechanisms, including decreased plant cover, an intensified hydrological cycle due to greenhouse warming, and the doming of the Central Atlantic Magmatic Province leading to continental-scale tectonic steepening of basin margins.

  8. Gold-silver-tellurium mineral assemblages in different ore styles of the Southern Urals VHMS deposits

    NASA Astrophysics Data System (ADS)

    Maslennikov, V. V.; Zaykov, V. V.; Maslennikova, S. P.; Tesalina, S. G.; Herrington, R. J.; Buschmann, B.; Becker, K.; Petersen, S.; Orgeval, J. J.; Leistel, M.

    2003-04-01

    VMS deposits of the South Urals generally show a continuum in degradation and reworking ranging from pristine steep-sided hydrothermal sulphide mounds to deposits dominated by layered strata of clastic sulphides. Four different deposits with varying degrees of degradation in order of increased reworking: (Yaman-Kasy longrightarrow Molodezhnoe longrightarrow Alexandrinskoe longrightarrow Balta-Tau) have been ranged. The influence of sulphide mound destruction and of sea-floor alteration on mineral assemblages was investigated In the pristine Yaman-Kasy sulphide mound gold and silver occur as altaite+tellurium+hessite-stuetzite+sylvanite and later galena+native gold+pyrite assemblages in chalcopyrite+isocubanite-rich linings of former chimney conduits. Chalcopyrite-dominated conduit fragments in clastic ore facies contain native tellurium+gold intergrowths. In the weakly reworked Molodezhnoe deposit gold-silver assemblages only occur in sea-floor altered clastic sulphides on the slope of massive sulphide mounds in bornite- and tennantite-rich ores in association with Cu-Ag sulfides such as jalpaite, mckinstryite, and stromeyerite and rare Au-Ag-tellurides (petzite). The Alexandrinskoe deposit is dominated by clastic ores and here native gold and rare hessite occur together with galena in tennantite-sphalerite-dominated veins of the footwall as well as in drusy sphalerite forming conduits of vent chimneys. An assemblage of electrum+galena+tennantite was observed in secondary chalcopyrite in the outer walls of chimneys. Native gold+stromeyerite are common in bornite-rich clastic sulphides while an assemblage of Ag-sulphosalts+electrum is common in barite-rich ores. In the reworked Balta-Tau deposit Ag-sulphosalts+electrum-kustelite occur often together with tennantite+galena+barite banded ores. Gold-silver-telluride mineralisation in these VMS deposits changes with degree of reworking from Au-tellurides, and native gold+galena+pyrite in pristine sulphide mounds to

  9. NASA-DoD Lead-Free Electronics Project

    NASA Technical Reports Server (NTRS)

    Kessel, Kurt R.

    2009-01-01

    In response to concerns about risks from lead-free induced faults to high reliability products, NASA has initiated a multi-year project to provide manufacturers and users with data to clarify the risks of lead-free materials in their products. The project will also be of interest to component manufacturers supplying to high reliability markets. The project was launched in November 2006. The primary technical objective of the project is to undertake comprehensive testing to generate information on failure modes/criteria to better understand the reliability of: - Packages (e.g., TSOP, BOA, PDIP) assembled and reworked with solder interconnects consisting of lead-free alloys - Packages (e.g., TSOP, BOA, PDIP) assembled and reworked with solder interconnects consisting of mixed alloys, lead component finish/lead-free solder and lead-free component finish/SnPb solder.

  10. NASA-DoD Lead-Free Electronics Project

    NASA Technical Reports Server (NTRS)

    Kessel, Kurt R.

    2009-01-01

    In response to concerns about risks from lead-free induced faults to high reliability products, NASA has initiated a multi-year project to provide manufacturers and users with data to clarify the risks of lead-free materials in their products. The project will also be of interest to component manufacturers supplying to high reliability markets. The project was launched in November 2006. The primary technical objective of the project is to undertake comprehensive testing to generate information on failure modes/criteria to better understand the reliability of: - Packages (e.g., TSOP, BGA, PDIP) assembled and reworked with solder interconnects consisting of lead-free alloys - Packages (e.g., TSOP, BGA, PDIP) assembled and reworked with solder interconnects consisting of mixed alloys, lead component finish/lead-free solder and lead-free component finish/SnPb solder.

  11. Thermal management of a high power multichip module in a space environment

    SciTech Connect

    Coogan, S.A.; Maynard, J.; Stoklosa, M.; Gilmour, D.

    1996-03-01

    As multichip module (MCM) power increases, thermal management becomes more challenging. A radiation hardened, 32 bit (RH-32) computer multichip module (MCM) is being developed under the MILSATCOM program using aluminum nitride (AlN) as the MCM package material. This state-of-the-art use of AlN provides excellent heat spreading and thermal management. The result is an MCM virtually without hot-spots. Unfortunately, use of AlN complicates a number of the standard MCM assembly and rework processes. This paper will discuss the use of AlN, present the results of a detailed thermal analysis and the work done to fine tune MCM assembly and rework processes. {copyright} {ital 1996 American Institute of Physics.}

  12. Deterministic polishing from theory to practice

    NASA Astrophysics Data System (ADS)

    Hooper, Abigail R.; Hoffmann, Nathan N.; Sarkas, Harry W.; Escolas, John; Hobbs, Zachary

    2015-10-01

    Improving predictability in optical fabrication can go a long way towards increasing profit margins and maintaining a competitive edge in an economic environment where pressure is mounting for optical manufacturers to cut costs. A major source of hidden cost is rework - the share of production that does not meet specification in the first pass through the polishing equipment. Rework substantially adds to the part's processing and labor costs as well as bottlenecks in production lines and frustration for managers, operators and customers. The polishing process consists of several interacting variables including: glass type, polishing pads, machine type, RPM, downforce, slurry type, baume level and even the operators themselves. Adjusting the process to get every variable under control while operating in a robust space can not only provide a deterministic polishing process which improves profitability but also produces a higher quality optic.

  13. Experimental investigation of thermoelastic deformation in turbojet-engine bearings under maintenance inspection

    SciTech Connect

    Kochevar, A.J.; Bert, C.W.

    1995-04-01

    The present investigation examined the vertical and horizontal thermoelastic changes in the outside diameter of a turbojet-engine roller bearing. Thermal loads were imparted to the bearing by the hands of a bearing technician during a rework operation. A worst-case analysis was examined by assuming a three-minute dwell time and diametrically symmetric thermal loading. Contact temperature was experimentally determined and used in conjunction with a numerical model to simulate thermal propagation throughout the bearing outer ring. Diametric deflection data, obtained using the contact temperature in conjunction with analytic and finite elements, have been shown for comparative purposes. Experimental diametric expansions of the bearing outer ring were determined and compared with the predicted results. Assuming a worst-case scenario, this investigation yielded vertical expansions in the bearing outer ring`s diameter, which would be problematic for some bearings during the rework operation; appropriate corrective action was discussed.

  14. End-point process development for low-volume, high reliability tungsten CMP

    SciTech Connect

    Merkle, P.B.; Myers, T.L.

    1997-12-01

    A temperature end point method was developed for tungsten CMP (WCMP) processing in the Sandia Microelectronics Development Laboratory (MDL), a facility which develops and prototypes a variety of silicon based devices including ASIC, memory, radiation hardened CMOS and microelectromechanical systems. A large product variety and small production lot size prevents process recipe optimization or standardization for each mask level and product. Rigorous product reliability requirements and prohibitively expensive hardware qualifications essentially require that a single process and consumable set be established for all products, with minimal opportunity for adjustment. A timed process was not suitable without significant potential for manual inspections and rework. Over several weeks of processing on an IPEC 472, the temperature end point method gave a 7.7% 1-sigma end point time distribution. This enabled a 50% reduction in daily process qualification wafers, and allowed minimization of yield loss, rework, and oxide erosion.

  15. Cretaceous pollen in Pliocene rocks: Implications for Pliocene climate in the southwestern United States

    NASA Astrophysics Data System (ADS)

    Farley Fleming, R.

    1994-09-01

    Pliocene rocks of the Imperial and Palm Spring Formations in southern California contain reworked Cretaceous pollen that helps determine the timing of erosion of Cretaceous rocks on the Colorado Plateau. The stratigraphic distribution of reworked pollen in the Imperial and Palm Spring Formations suggests that erosion of Cretaceous rocks in the southern part of the Colorado Plateau began by 4.5 Ma. Erosion of Cretaceous rocks in the northern part of the plateau began at 3.9 Ma. This erosional history indicates that rapid and extensive erosion of the Colorado Plateau occurred during the Pliocene and supports the hypothesis that much of the Grand Canyon was cut during the Pliocene, rather than earlier in the Tertiary. Rapid erosion and transport from the Colorado Plateau require the climate in that region during the Pliocene to have been significantly wetter than it is today.

  16. Regolith stratigraphy at the Chang'E-3 landing site as seen by lunar penetrating radar

    NASA Astrophysics Data System (ADS)

    Fa, Wenzhe; Zhu, Meng-Hua; Liu, Tiantian; Plescia, Jeffrey B.

    2015-12-01

    The Chang'E-3 lunar penetrating radar (LPR) observations at 500 MHz reveal four major stratigraphic zones from the surface to a depth of ~20 m along the survey line: a layered reworked zone (<1 m), an ejecta layer (~2-6 m), a paleoregolith layer (~4-11 m), and the underlying mare basalts. The reworked zone has two to five distinct layers and consists of surface regolith. The paleoregolith buried by the ejecta from a 500 m crater is relatively homogenous and contains only a few rocks. Population of buried rocks increases with depth to ~2 m at first, and then decreases with depth, representing a balance between initial deposition of the ejecta and later turnover of the regolith. Combining with the surface age, the LPR observations indicate a mean accumulation rate of about 5-10 m/Gyr for the surface regolith, which is at least 4-8 times larger than previous estimation.

  17. Stratification in the lunar regolith - A preliminary view

    NASA Technical Reports Server (NTRS)

    Duke, M. B.; Nagle, J. S.

    1975-01-01

    Although our knowledge of lunar regolith stratification is incomplete, several categories of thick and thin strata have been identified. Relatively thick units average 2 to 3 cm in thickness, and appear surficially to be massive. On more detailed examination, these units can be uniformly fine-grained, can show internal trends, or can show internal variations which apparently are random. Other thick units contain soil clasts apparently reworked from underlying units. Thin laminae average approximately 1 mm in thickness; lenticular distribution and composition of some thin laminae indicates that they are fillets shed from adjacent rock fragments. Other dark fine-grained well-sorted thin laminae appear to be surficial zones reworked by micrometeorites. Interpretations of stratigraphic succession can be strengthened by the occurrence of characteristic coarse rock fragments and the orientation of large spatter agglutinates, which are commonly found in their original depositional orientation.

  18. Fluidized muds: a novel setting for the generation of biosphere diversity through geologic time.

    PubMed

    Aller, J Y; Aller, R C; Kemp, P F; Chistoserdov, A Y; Madrid, V M

    2010-06-01

    Reworked and fluidized fine-grained deposits in energetic settings are a major modern-day feature of river deltas and estuaries. Similar environments were probably settings for microbial evolution on the early Earth. These sedimentary systems act as efficient biogeochemical reactors with high bacterial phylogenetic diversity and functional redundancy. They are temporally rather than spatially structured, with repeated cycling of redox conditions and successive stages of microbial metabolic processes. Intense reworking of the fluidized bed entrains bacteria from varied habitats providing new, diverse genetic materials to contribute to horizontal gene transfer events and the creation of new bacterial ecotypes. These vast mud environments may act as exporters and promoters of biosphere diversity and novel adaptations, potentially on a globally important scale.

  19. Large Area Crop Inventory Experiment (LACIE). LACIE phase 1 and phase 2 accuracy assessment. [Kansas, Texas, Minnesota, Montana, and North Dakota

    NASA Technical Reports Server (NTRS)

    1978-01-01

    The author has identified the following significant results. The initial CAS estimates, which were made for each month from April through August, were considerably higher than the USDA/SRS estimates. This was attributed to: (1) the practice of considering bare ground as potential wheat and counting it as wheat; (2) overestimation of the wheat proportions in segments having only a small amount of wheat; and (3) the classification of confusion crops as wheat. At the end of the season most of the segments were reworked using improved methods based on experience gained during the season. In particular, new procedures were developed to solve the three problems listed above. These and other improvements used in the rework experiment resulted in at-harvest estimates that were much closer to the USDA/SRS estimates than those obtained during the regular season.

  20. Discrimination of eolian and pyroclastic-surge processes in the generation of cross-bedded tuffs, Jemez Mountains volcanic field, New Mexico

    SciTech Connect

    Smith, G.A.; Katzman, D. )

    1991-05-01

    Discrimination of pyroclastic deposits emplaced by volcanic processes and reworked pyroclastic sediments is a primary objective of studies in volcaniclastic strata. Cross-bedded tuffs of both eolian and pyroclastic-surge origins are identified within the late Miocene Peralta Tuff Member of the Bearhead Rhyolite, in north-central New Mexico. Distribution, paleoflow directions, grain-size characteristics, and depositional structures permit discrimination of these similar facies. Eolian tuffs exhibits structures diagnostic of eolian sands, are relatively well sorted, and lack both the fine ash and coarse lapilli and bombs typically found in surge deposits. Discrimination between eolian reworked and primary surge pyroclastic deposits is critical for volcanic hazard studies near modern volcanoes and for correct interpretation of proximity to vents in ancient volcaniclastic sequences.

  1. Electro-deposition painting process improvement of cab truck by Six Sigma concept

    NASA Astrophysics Data System (ADS)

    Kawitu, Kitiya; Chutima, Parames

    2017-06-01

    The case study company is a manufacturer of trucks and currently facing a high rework cost due to the thickness of the electro-deposited paint (EDP) of the truck cab is lower than standard. In addition, the process capability is very low. The Six Sigma concept consisting of 5 phases (DMAIC) is applied to determine new parameter settings for each significant controllable factor. After the improvement, EDP thickness of the truck cab increases from 17.88μ to 20μ (i.e. standard = 20 ± 3μ). Moreover, the process capability indexes (Cp and Cpk) are increased from 0.9 to 1.43, and from 0.27 to 1.43, respectively. This improvement could save the rework cost about 1.6M THB per year.

  2. Thermally Conductive-Silicone Composites with Thermally Reversible Cross-links.

    PubMed

    Wertz, J T; Kuczynski, J P; Boday, D J

    2016-06-08

    Thermally conductive-silicone composites that contain thermally reversible cross-links were prepared by blending diene- and dienophile-functionalized polydimethylsiloxane (PDMS) with an aluminum oxide conductive filler. This class of thermally conductive-silicones are useful as thermal interface materials (TIMs) within Information Technology (IT) hardware applications to allow rework of valuable components. The composites were rendered reworkable via retro Diels-Alder cross-links when temperatures were elevated above 130 °C and required little mechanical force to remove, making them advantageous over other TIM materials. Results show high thermal conductivity (0.4 W/m·K) at low filler loadings (45 wt %) compared to other TIM solutions (>45 wt %). Additionally, the adhesion of the material was found to be ∼7 times greater at lower temperatures (25 °C) and ∼2 times greater at higher temperatures (120 °C) than commercially available TIMs.

  3. The nature of rays and sources of highland material in Mare Crisium

    NASA Technical Reports Server (NTRS)

    Maxwell, T. A.; El-Baz, F.

    1978-01-01

    Although highland fragments are rare in the Luna 24 core, they should provide an important source of information on the sequence of formation and lithology of lunar east-limb basins. The numerous rays that cross the Crisium basin suggest several sources of highland materials. Both deposition of primary ejecta and reworking of local material were most likely responsible for the formation of ray systems in Mare Crisium. In addition to the fact that Luna 24 landed near the uprange end of a Giordano Bruno ray, incomplete sampling of the uppermost layer and formation of the ray by reworking of in situ regolith suggest that its materials may be scarce or not present in the core. Highland fragments present are most likely to be representative of several highland sources.

  4. The Precambrian terranes of Yemen and their correlation with those of Saudi Arabia and Somalia: Implications for the accretion of Gondwana

    USGS Publications Warehouse

    Windley, B.F.; Whitehouse, M.J.; Stoeser, D.B.; Al-Khirbash, S.; Ba-Bttat, M. A. O.; Al-Ghotbah, A.

    2001-01-01

    Most of the basement of Yemen consists of early Precambrian continental high-grade terranes and Neoproterozoic low-grade island arcs that were accreted together to form an arc-continent collage during the Pan-African orogeny (Windley et al., 1996; Whitehouse et al., 1998; Whitehouse et al., in press). The suture zones between the arc and gneiss terranes are major crustal- scale tectonic boundaries. The terranes are situated east of the Nabitah suture and of the collage of low-grade, mainly island arc terranes of the Arabian Shield, but they have been reworked by a Neoproterozoic event associated with island arc accretion. Further east in Yemen are mostly unconformable, very weakly deformed and very low-grade or unmetamorphosed sediments. Thus Yemen provides key information on the broad zone of Neoproterozoic reworking associated with the collisional boundary between western and eastern Gondwana. 

  5. U-series dating and stable isotope records of speleothem records from the Scladina Cave (Belgium)

    NASA Astrophysics Data System (ADS)

    van der Lubbe, Jeroen; Bonjean, Dominique; Hellstrom, John; Verheyden, Sophie; Vonhof, Hubert

    2015-04-01

    The Scladina cave, situated in the village of Sclayn (Ardennes, Belgium) at the southern bank of the Meuse, is famous for its Neanderthal fossils and artefacts. The infilling of the cave consists of a succession of flowstone layers interbedded with reworked loess sediment from outside the cave. The younger flowstone layers correspond to interglacials MIS 5 and the Holocene, while the reworked loess sediments represent cooler conditions. By careful diagenetic screening, well-preserved speleothem material was selected for U-series dating and stable isotope analysis of calcite and fluid inclusions. The results provide important new constraints on the age of Neanderthal fossils and artefacts, and bracket the time periods with a hydroclimate favorable for speleothem growth. The combination of fluid inclusion and calcite isotope analysis documents climate variability in the interglacials at high temporal resolution.

  6. NASA-DoD Lead-Free Electronics Project

    NASA Technical Reports Server (NTRS)

    Kessel, Kurt

    2009-01-01

    In response to concerns about risks from lead-free induced faults to high reliability products, NASA has initiated a multi-year project to provide manufacturers and users with data to clarify the risks of lead-free materials in their products. The project will also be of interest to component manufacturers supplying to high reliability markets. The project was launched in November 2006. The primary technical objective of the project is to undertake comprehensive testing to generate information on failure modes/criteria to better understand the reliability of: (1) Packages (e.g., Thin Small Outline Package [TSOP], Ball Grid Array [BGA], Plastic Dual In-line Package [PDIP]) assembled and reworked with solder interconnects consisting of lead-free alloys (2) Packages (e.g., TSOP, BGA, PDIP) assembled and reworked with solder interconnects consisting of mixed alloys, lead component finish/lead-free solder and lead-free component finish/SnPb solder

  7. The failure analysis, redesign, and final preparation of the Brilliant Eyes Thermal Storage Unit for flight testing

    NASA Technical Reports Server (NTRS)

    Lamkin, T.; Whitney, Brian

    1995-01-01

    This paper describes the engineering thought process behind the failure analysis, redesign, and rework of the flight hardware for the Brilliant Eyes Thermal Storage Unit (BETSU) experiment. This experiment was designed to study the zero-g performance of 2-methylpentane as a suitable phase change material. This hydrocarbon served as the cryogenic storage medium for the BETSU experiment which was flown 04 Mar 94 on board Shuttle STS-62. Ground testing had indicated satisfactory performance of the BETSU at the 120 Kelvin design temperature. However, questions remained as to the micro-gravity performance of this unit; potential deviations in ground (1 g) versus space flight (0 g) performance, and how the unit would operate in a realistic space environment undergoing cyclical operation. The preparations and rework performed on the BETSU unit, which failed initial flight qualification, give insight and lessons learned to successfully develop and qualify a space flight experiment.

  8. Holocene evolution of the merrimack embayment, northern massachusetts, interperted from shallow seismic stratigraphy

    USGS Publications Warehouse

    Hein, C.J.; FitzGerald, D.M.; Barnhardt, W.A.

    2007-01-01

    Recent multi-beam, backscatter, and bottom sediment data demonstrate that a large sand sheet was formed in the inner shelf by the reworking of the Merrimack River lowstand delta and braid plain (12 kya) during the Holocene transgression. Seismic data reveal the presence of widespread channel cut-and-fill structures landward of the delta suggesting that much of the sand sheet consists of braided stream deposits. These features map into several sets of cut-and-fill structures, indicating the avulsion of the primary river channels, which creates the lobes of the paleo-delta. Truncations of these, cut-and-fill structures suggest that the braid plain deposits were probably reworked during the Holocene transgression and may have contributed sand to developing barriers that presently border the Merrimack Embayment.

  9. An Acquisition Perspective on Product Evaluation

    DTIC Science & Technology

    2011-10-01

    and rework. Current practice emphasizes testing as the principal means of determining whether a product meets specified customer needs and quality...provides the capabilities that a customer needs [Boehm 2001, Bennett 2005]. Much of the evaluation effort during product development is indirect...consistency and completeness relative to perceived customer needs rather than whether the product is a best fit to those needs given development

  10. Final report on Technical Demonstration and Economic Validation of Geothermally-Produced Electricity from Coproduced Water at Existing Oil/Gas Wells in Texas

    SciTech Connect

    Luchini, Chris B.

    2015-06-01

    The initial geothermal brine flow rate and temperature from the re-worked well were insufficient, after 2.5 days of flow testing, to justify advancing past Phase I of this project. The flow test was terminated less than 4 hours from the Phase I deadline for activity, and as such, additional flow tests of 2+ months may be undertaken in the future, without government support.

  11. Evolution and stratigraphy of a sandy tidal-flat complex within a Mesotidal embayment

    SciTech Connect

    McCants, C.Y.; Zarillo, G.A.

    1985-02-01

    Sand-dominated intertidal environments in St. Helena Sound, South Carolina, a mesotidal estuarine system, can be divided into a continuum of barlike deposits dominated by tidal flows and sheetlike deposits of sandy tidal flats that are influenced by both waves and currents. A large sand flat attached to a marsh-island complex in the central interior of St. Helena Sound resembles a large flood-tidal delta and has been reworked by waves and migrating ebb-dominated tidal channels. The lower tidal flat (flood ramp) is composed of coarse to medium sand mixed with shell material. Large-scale planar cross-beds are formed by flood-oriented sand waves. Middle tidal-flat deposits consist of fine to very fine sand where burrowing by intertidal fauna disrupts structures of intermediate to small-scale bed forms generated by both waves and tidal currents. The muddy, fine-grained sands of the upper tidal flat are reworked by wave-generated small-scale ripples and are partially bioturbated. A salt marsh-chenier complex, landward of the upper tidal flat, has prograded over older portions of the sand flat during earlier regressive phases. Evolution of the St. Helena Sound sand flats began with a transgressive phase marked by a transgressive lag deposit dated at 4200 yr B.P., overlying Pleistocene estuarine, mud-flat, and salt-marsh deposits. Sediment for buildup of the sand flats was derived from reworking of surrounding barrier-island sands by migrating tidal channels. Sand was introduced into the lower tidal flat by swash-bar accumulation or strong flood-tidal currents. Building of the sand-flat sequence and development of the overlying salt marsh-chenier complex occurred episodically due to minor fluctuations in sea level. At present, the sand-flat sequence is in a transgressive phase and is being reworked by migrating tidal channels and the seawardmost chenier is subject to frequent overwashing.

  12. Improving Acquisition From Within: Suggestions From Our PEOs

    DTIC Science & Technology

    2016-08-01

    communicated well, and this often creates much rework, further delaying approval and impacting pro­ gram cost and schedule. • The vast majority of our...improved. I’ve re­ ceived very positive feedback on the learning value of these sessions and encouraged my subordinates to replicate the process at lower... gram and how these considerations shape acquisition strat­ egy, contract type, contract incentives, and source selec­ tion approaches. To date, I have

  13. Rate Training manual and Nonresident Career Course. Aviation Machinist’s Mate 1 & C

    DTIC Science & Technology

    1984-01-01

    reworking by what type of inspection? 1. Visual 2. Dye penetrant 3. Magnaflux 4. X - ray 12 2-49. When a complete replacement of 2-54. Combustion liners...aintenance ................................... 4-1 5. Jet Engine Testing and Operation ......................... 5-1 IN D E X ...are assembled. Figure 2-2 shows drawings and diagrams, refer to the rate training a cutaway drawing and figure 2-3 shows an manual, Blueprint Reading

  14. Arctic Alaska’s Lower Cretaceous (Hauterivian and Barremian) mudstone succession - Linking lithofacies, texture, and geochemistry to marine processes: Chapter B in Studies by the U.S. Geological Survey in Alaska, vol. 15

    USGS Publications Warehouse

    Keller, Margaret A.; Macquaker, Joe H.S.

    2015-01-01

    Our results document the variation in facies and textures of the Hauterivian and Barremian Lower Cretaceous mudstone succession of Arctic Alaska. Comparison of these characteristics to the products of modern processes on the North Slope of Alaska, in the Beaufort Sea, and elsewhere suggest that this succession formed primarily from depositional processes related to seasonal sea ice with intermittent fluvial-sourced sediment deposited by density currents and episodic erosion and reworking by storms and other currents.

  15. CrossTalk: The Journal of Defense Software Engineering. Volume 25, Number 1, January/February 2012

    DTIC Science & Technology

    2012-02-01

    Engineering” Addison-Wesley, 1995. 6. Kaplan , R., Norton , D., “The Balanced Scorecard ”, Harvard Business School Press, 1996. 7. IEEE Computer Society, “ IEEE...Improve continuously and forever. 5. Tracking the Improvement: the AIS Balanced Scorecard We used the Balanced Scorecard (BSC) method [6] to commu...solutions (inno- vation). Reduced rework and predictable development schedules lead to work/life balance . High performance jelled team environ- ment

  16. Dos and Donts for Conditional Acceptance of Nonconforming Supplies or Services

    DTIC Science & Technology

    2016-06-01

    have quite a few options in dealing with this prob-lem, including conditional acceptance. The purpose of this article is, first, to share a personal ...accom- modate that request. Out of all the choices (reject, rework at no additional cost, replacement or terminate for default) avail- able under FAR...sub-part 46.407 to the government, conditional acceptance was probably thought to be the easiest and most expeditious choice . But for whom

  17. Remarks on the determination of the fraction of excimer sites in macromolecules

    NASA Astrophysics Data System (ADS)

    Sienicki, K.; Bojarski, C.

    1985-02-01

    A mathematical model taking into consideration excitation energy migration has been proposed in order to determine the fraction of excimer sites (FES) in synthetic macromolecules. Data for polystyrene and iso- and atactic poly(ar-methyl styrene0 of varying molecular mass have been taken from the work of Ishii, Handa and Matsunaga and re-worked in terms of the proposed model. The FES obtained are compared with those determined from other models.

  18. The impact of high-resolution biostratigraphy on reservoir prediction and basin history - A Barents Sea case study

    SciTech Connect

    Husmo, T. ); Hochuli, P. )

    1991-08-01

    The Hammerfest Basin is bounded by the Troms-Finnmark Platform to the south and the Loppa High to the north. Twenty-seven exploration wells have been drilled in the basin since 1980. The objective for most of these wells was Middle Jurassic fault blocks. Until recently little attention has been paid to the Upper Jurassic to Lower Cretaceous synrift sequence. The first well drilled on Block 7120/10 tested a rotated Jurassic fault block. This well, together with two wells in an adjacent block, penetrated thin Lower Cretaceous sands near the distal pinch-outs of fault wedges. Seismic data indicated that a basinal wedge of equivalent age was present on Block 7120/10. High risk was put on the presence of sand in this basinal wedge, and a detailed biostratigraphic analysis was performed on wells along the basin margin in order to determine the timing of erosion on the margin and whether the Jurassic-Triassic coarse clastics were present in the provenance area. The analysis separated reworked from in-situ palynomorph assemblages in the synrift succession in the analyzed wells. A clear inverted stratigraphy was displayed by the reworked palynomorphs. Furthermore, a dramatic increase in reworked palynomorphs. Furthermore, a dramatic increase in reworked palynomorphs was observed in all wells at the onset of Valanginian. In particular the presence of Nannoceratopsis gracilis suggested that shallow marine Jurassic clastics were eroded at this time. Sand presence was predicted for the basinal wedge. The understanding of the basin history was also improved. Well 71Z0/10-2 drilled summer 1990 proved the success of the reservoir prediction and hence the usefulness of incorporating biostratigraphy in the assessment.

  19. The Birth, Life and Death of the CNT: Imaging Carbon Nanotube Growth

    DTIC Science & Technology

    2010-04-22

    synthesis of BN nanotubes • Boron nitride nanotubes have invariant electronic properties and high oxidation resistance. • Synthesis using borazine...reworking of the TEM vacuum and gas manifold systems to yield conditions for controlled nanotube synthesis . At the end of the grant period, we were...code) 04-22-2010 Final 09-01-07 to 05-31-08 The Birth, Life and Death of the CNT: Imaging Carbon Nanotube Growth W911NF-07-0550 NA NA

  20. Archaeological Survey of 73 Artillery Firing Points: Fort Bragg Training Area, Cumberland and Hoke Counties, North Carolina

    DTIC Science & Technology

    2006-03-01

    diagnostic shoulder area and distal tip remain (Figure 17). The drill appears to be a reworked/resharpened projectile point made from aphyric rhyolite ...reduction flakes and two quartz flake fragments were recovered. One metavolcanic flake is of aphyric rhyolite , while the remaining three are of a...porphyritic rhyolite material. All of the metavolcanic materials show evidence of weathering. The two quartz flakes are of a semi-translucent-to-white

  1. Manufacturing Methods and Technology Project Summary Reports.

    DTIC Science & Technology

    1980-12-01

    threshold. Work on the hybrid package included substitution of a welded lid for a soldered lid. This change would permit delidding, rework and resealing . A...the rigid requirements of tracked vehicles. This effort was conducted in two phases. In phase I of this effort, a weld-deposited hard-face aluminum...develop- ment. Initial efforts were concentrated on fabricating three types of pack sintered preforms: a simple cross-shaped preform which would require

  2. Documenting Fine-Sediment Import and Export for Two Contrasting Mesotidal Flats

    DTIC Science & Technology

    2011-09-30

    these channels. This suggests a mechanism by which sediment temporarily stored in winter channel deposits is subsequently reworked before and during...accretes over longer time scales in equilibrium with the space provided. The preservation of laminated deposits (65-90 cm thick) buried 155-230 cm...from the banks and flats (upper tier) were collected in July 2009, and show (from left to right) mottled sediment away from channels, and laminated

  3. Designing an Electronics Data Package for Printed Circuit Boards (PCBs)

    DTIC Science & Technology

    2013-08-01

    package to help avoid errors and rework . II. PCB DATA PACKAGE REQUIREMENTS LIST The technical data package is comprised of documentation including an...Memory Card International Association)  IPC-6015 MCM-L (Multi-Chip Module – Laminated )  IPC-6016 HDI (High Density Interconnect)  IPC-6018...Interconnect ICT In Circuit Tester IPC Association Connecting Electronics Industries MCM-L Multi-Chip Module – Laminated MIL Military NEMA National

  4. Improved Design Process Part of the Ship Producibility Program of the National Shipbuilding Research Program

    DTIC Science & Technology

    1977-04-01

    B7, B8, B9 and B10 , as indicated by the annotations. Item B5 illustrates a good structural design for producibility. Various developments and possible... burner to specific areas aboard ship. Late data or changes may result in damaging completed coating systems causing significant rework. Reductions in...NC burner (52 percent) and all other holes field cut at assembly, no revisions. Based on these factors and the cost data tabulated, the estimated cost

  5. A Proposed Material Requirements Planning System for NARF Alameda.

    DTIC Science & Technology

    1980-03-01

    in general and stock availability in particular is a vital part of the plan. Demand forecasting by workload driven material requirements planning (MRP...CATION OFr THIS PAGIt (b DNe ,,w UNCLASSIFIED fOCMVv CLISIJlOICATION ev Too$$ wasOfI¢ e Meoe 9.00" means to improve stock availability. This thesis...Oakland. Improving supply support of the Naval Air Rework Facility Alameda in general and stock availability in particular is a vital part of the plan

  6. Ruggedized Spectrometers Are Built for Tough Jobs

    NASA Technical Reports Server (NTRS)

    2015-01-01

    The Mars Curiosity Chemistry and Camera instrument, or ChemCam, analyzes the elemental composition of materials on the Red Planet by using a spectrometer to measure the wavelengths of light they emit. Principal investigator Roger Wiens worked with Ocean Optics, out of Dunedin, Florida, to rework the company's spectrometer to operate in cold and rowdy conditions and also during the stresses of liftoff. Those improvements have been incorporated into the firm's commercial product line.

  7. Controlling Arc Length in Plasma Welding

    NASA Technical Reports Server (NTRS)

    Iceland, W. F.

    1986-01-01

    Circuit maintains arc length on irregularly shaped workpieces. Length of plasma arc continuously adjusted by control circuit to maintain commanded value. After pilot arc is established, contactor closed and transfers arc to workpiece. Control circuit then half-wave rectifies ac arc voltage to produce dc control signal proportional to arc length. Circuit added to plasma arc welding machines with few wiring changes. Welds made with circuit cleaner and require less rework than welds made without it. Beads smooth and free of inclusions.

  8. 23. Photocopied 1983, from original drawing (DP24800), Picatinny Arsenal, January ...

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

    23. Photocopied 1983, from original drawing (DP-24800), Picatinny Arsenal, January 27, 1937. BUILDING NO. 520, 'INSTALLATION OF CENTRIFUGALS FOR REWORKED SMOKELESS POWER, BUILDING NO. 520. JUDGING FROM THE BUILDING FABRIC INDICATED IN THE 'PLAN,' THIS EQUIPMENT WAS LOCATED IN THE EXTREME NORTHWEST CORNER OF BUILDING NO. 520 (COMPARE TO LOWER LEFT CORNER OF 'SECOND FLOOR PLAN' IN NJ-36-C-21). - Picatinny Arsenal, 500 Area, Powder Factory & Power House, State Route 15 near I-80, Dover, Morris County, NJ

  9. 33. Photocopied 1983, from original drawing (DP49484), Picatinny Arsenal, November ...

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

    33. Photocopied 1983, from original drawing (DP-49484), Picatinny Arsenal, November 29, 1948. 'SMOKELESS POWDER Area: REWORK POWDER PROCESS FLOW DIAGRAM.' THE PROCESS DETAILED IN THIS DIAGRAM FROM THE POACHING HOUSE TO THE PACK HOUSE IS SUBSTANTIALLY THE SAME AS THE ONE FOR PRODUCING NEW POWDER FROM NITRATED COTTON. - Picatinny Arsenal, 500 Area, Powder Factory & Power House, State Route 15 near I-80, Dover, Morris County, NJ

  10. Highly efficient method for production of radioactive silver seed cores for brachytherapy.

    PubMed

    Cardoso, Roberta Mansini; de Souza, Carla Daruich; Rostelato, Maria Elisa Chuery Martins; Araki, Koiti

    2017-02-01

    A simple and highly efficient (shorter reaction time and almost no rework) method for production of iodine based radioactive silver seed cores for brachytherapy is described. The method allows almost quantitative deposition of iodine-131 on dozens of silver substrates at once, with even distribution of activity per core and insignificant amounts of liquid and solid radioactive wastes, allowing the fabrication of cheaper radioactive iodine seeds for brachytherapy.

  11. Tooling Converts Stock Bearings To Custom Bearings

    NASA Technical Reports Server (NTRS)

    Fleenor, E. N., Jr.

    1983-01-01

    Technique for reworking stock bearings saves time and produces helicopter-rotor bearings ground more precisely. Split tapered ring at one end of threaded bolt expands to hold inside of inner race bearing assembly; nut, at other end of bolt, adjusts amount of spring tension. Piece of hardware grasps bearing firmly without interfering with grinding operation. Operation produces bearing of higher quality than commercially available bearings.

  12. Aeolian Processes and Landforms in River Valleys of Central Russian Plain in MIS 2

    NASA Astrophysics Data System (ADS)

    Matlakhova, Ekaterina

    2015-04-01

    Late Pleistocene terraces in river valleys of Central Russian Plain were subject to aeolian reworking after the alluvial sedimentation had finished. Severe natural conditions of LGM (cold and dry climate, scarce vegetation) contributed activation of aeolian processes. Ground water lowering because of deep pre-LGM incision of rivers made deep aeolian reworking possible at low hypsometric levels of valley bottom. We studied lithological structure of terraces in river valleys of Central Russian Plain. The key sites were located in Seim (the middle Dnieper catchment) and Khoper (the middle Don catchment) river valleys. Field data was combined with quartz grains morphoscopy technique (study of texture of sediment particles using scanning electron microscope). Wide participation of aeolian sediments in terrace deposits was detected. During this study a new technique of the distinguishing of short-term aeolian reworking of alluvial deposits using quartz grains morphoscopy technique was developed. The main problem of interpretation the results of quartz grains morphoscopy is that aeolian signals are sometimes not clear due to short duration of wind action over alluvial sands. However, detailed studies of the quartz grains surfaces under scanning electron microscope helped to solve this problem. We used scanning electron microscope JEOL JSM-661 LV and worked with magnification from ×160 to ×400 for whole grains and up to ×1800 for some parts of grains. Deep aeolian reworking of Late Pleistocene terrace alluvium in river valleys of Central Russian Plain during LGM led to the formation of aeolian covers on the terrace surfaces. Also there are many relict dunes on Late Pleistocene river terrace surfaces. Sometimes the development of aeolian processes could led to more significant changes in the shape of the valley and formation of aeolian aprons. The thickness of aeolian covers can reach 3-5 m or more. Due to this reason morphology and topography of river terraces could

  13. Agile Mythbusting

    DTIC Science & Technology

    2015-01-01

    Waterfall (HW-centric) and Agile Development (SW-centric) Have Risks Assess the impact of: • delivered capabilities • cost of delay, rework to...determine efficient increments. Focus on Integrated Approach Waterfall Cost of over analysis, up-front requirements, design delays capabilities delivered...Agile or Waterfall —you can’t do both You can’t use Earned Value Management on Agile Software Developments 29 Agile Myths, Picatinny Arsenal Lapham

  14. Bridging a High School Science Fair Experience with First Year Undergraduate Research: Using the E-SPART Analyzer to Determine Electrostatic Charge Properties of Compositionally Varied Rock Dust Particles as Terrestrial Analogues to Mars Materials

    NASA Technical Reports Server (NTRS)

    Scott, A. G.; Williams, W. J. W.; Mazumder, M. K.; Biris, A.; Srirama, P. K.

    2005-01-01

    NASA missions to Mars confirm presence of surficial particles, as well as dramatic periods of aeolian reworking. Dust deposition on, or infiltration into, exploration equipment such as spacecraft, robotic explorers, solar panel power supplies, and even spacesuits, can pose significant problems such as diminished power collection, short circuits / discharges, and added weight. We report results conducted initially as a science fair project and a study now part of a first year University undergraduate research experience.

  15. Source and dispersal of silt on northern Gulf of Mexico Continental Shelf

    SciTech Connect

    Peterson, M.; Mazzullo, J.

    1988-02-01

    The surficial sediment on the continental shelf of the northern Gulf of Mexico is characterized by abundant silty clay which was deposited during the late Pleistocene lowstand and reworked during and after the Holocene transgression. The purposes of this study were to determine the sources of the silt fraction in this surficial sediment by quartz grain roundness and surface texture analysis, and to determine the effects of modern shelf currents upon the distribution of silt.

  16. Protective Coatings for Steel Structures: Laboratory and Field Evaluation and Development of a Model Coating Guide Specification.

    DTIC Science & Technology

    1980-01-01

    developed as a part of this project, will help coatings specifiers select proper coat-. FORM, , DD I JAN 73 1473 EDITION O I NOV S5 IS OBSOLETE JNCLASSIFICi...inspection, both of materials and workmanship, will be closely monitored. Failure to comply with any phase of the material application could result in the...contractor reworking and reapplying the material. Upon completion of the contract, the contractor will furnish a written unconditional 20 g arantee

  17. Biological and related chemical research concerning subseabed disposal of high level nuclear waste

    NASA Astrophysics Data System (ADS)

    Mullin, M. M.; Gomez, L. S.

    1981-10-01

    This report contains: recommendations (research on radionuclide movement processes, research on radionuclide transport processes, administration and policy); abstracts of plenary talks (Large-Scale Distributions of Deep-Sea Benthic Organisms, Transfer Processes Between Water Column and Benthos, Particle Reworking and Biogeochemistry of Sediments, and radioecological Aspects of Deep-Sea Waste Disposal of Radionuclides. Summaries of subgroup discussions (geochemistry and microbiology, benthic biology, pelagic biology, radioecology); and appendices (model of physical biological transfers, and participants and institutional affiliations) are also presented.

  18. Crustal evolution in the East African Orogen: a neodymium isotopic perspective

    NASA Astrophysics Data System (ADS)

    Stern, Robert J.

    2002-05-01

    The East African Orogen (EAO) is one of Earth's great collision zones, where East and West Gondwana collided to form the supercontinent `Greater Gondwana' or `Pannotia' at the end of Neoproterozoic time. There is now sufficient Nd isotopic data for basement rocks of the EAO to yield a useful summary. A total of 449 samples were gleaned from the literature, recalculated to a common value for the La Jolla Nd standard, and entered in Excel spreadsheets. This data set was filtered to exclude samples with 147Sm/ 144Nd> 0.165, considered to yield unreliable model ages, leaving 413 suitable data. The crust of the Arabian-Nubian Shield, including Egypt east of the Nile, Sudan east of the Keraf suture, Sinai, Israel, Jordan, most of Arabia, Eritrea, and northern Ethiopia yields overwhelmingly Neoproterozoic model ages. Crust to the east, in the Afif terrane of Arabia, Yemen, Somalia, and Eastern Ethiopia yields much older model ages, averaging 2.1 Ga, demonstrating an abundance of reworked ancient crust. This provides an isotopic link with Madagascar (mean age of 2.4 Ga), which in pre-Jurassic reconstructions lies on the southern extension of this older, remobilized tract. Crust in the far southern extreme of the EAO in Tanzania also yields ancient model ages, averaging 2.3 Ga. The central EAO, in southern Ethiopia and Kenya, yields intermediate ages (mean 1.1-1.2 Ga), interpreted to indicate extensive mixing between Neoproterozoic mantle-derived melts and ancient crust. The Nd isotope data indicate that the northern EAO is composed of juvenile Neoproterozoic crust sandwiched between reworked older crust, whereas the EAO farther south is progressively dominated by ancient crust reworked during Neoproterozoic time. The distribution of juvenile and reworked ancient crust suggests that the most intense collision between East and West Gondwana occurred in the southern part of the EAO.

  19. New Method for Updating Mean Time Between Failure for ISS Orbital Replaceable Units Consultation Report

    NASA Technical Reports Server (NTRS)

    Parsons, Vickie S.

    2009-01-01

    A request to conduct a peer review of the International Space Station (ISS) proposal to use Bayesian methodology for updating Mean Time Between Failure (MTBF) for ISS Orbital Replaceable Units (ORU) was submitted to the NASA Engineering and Safety Center (NESC) on September 20, 2005. The results were requested by October 20, 2005 in order to be available during the process of reworking the current ISS flight manifest. The results are included in this report.

  20. Research Notes - Openness and Evolvability - Standards Assessment

    DTIC Science & Technology

    2016-08-01

    scope of the openness assessment. Note that if a standard (or group of standards) is encapsulated entirely within a granule (i.e. not part of an...infrastructure or interface definition used by the granule ) and is not visible to other granules within the architecture, then the standard does not...substantial number of different) granule vendors to rework their implementation, the migration is unlikely to be a realistic option. 2.1.15 Have changes to

  1. Test and Evaluation of a Pilot Two-Stage Precipitator for Jet Engine Test Cell Exhaust Gas Cleaning

    DTIC Science & Technology

    1976-04-01

    then available for emission control . A two- stage electrostatic precipitator was recommended as .j he most viable alternative to a concept then being...TEST AND EVALUATION OF A "PILOT TWO* STAGE PRECIPITATOR FOR JET ENGINE TEST CELL 0 EXHAUST GA, S CLEANING C44 NAVAL AIR REWORK FACILITY NAVAL AIR...is the release you requested in your telephone conversation of 20 July 1976 with the undersigned. Yourn very tru~ly, Head Specifications Branch a 21

  2. Gaseous Emissions from Aircraft Engines. A Handbook for the Calculation of Emission Indexes and Gaseous Emissions from Aircraft Engines

    DTIC Science & Technology

    1987-09-01

    corresponded to intervals of stable engine operation, as specified by the operators of the engine. Each laboratory reported emission indexes for the read ...period. The test established 50 read periods for gaseous emissions. Tabl, 5-1 gives the emission indexes at idle, high idle, approach, cruise and...emission indexes from a T58-GE-8F engine Test Cell - 12 Location - Naval Air Rework Facility, North Island IDLE Date Time Reading Prior Emission index

  3. Statistical process control applications in the metal working industry

    SciTech Connect

    Powers, H.G.

    1985-01-01

    Purpose of this paper is to describe those activities considered to be essential for continual improvements in the state of control over processes and to present basic concepts for structuring those activities. An effective process control function provides for improvements in both product quality and productivity. Quality increases because improved control over the process results in greater product uniformity. Productivity improves because costs related to removal of defective product, rework, repair, scrap, and customer dissatisfaction are minimized or eliminated.

  4. Investigation of a fossil geothermal system, Hamblin-Cleopatra Volcano, Clark County, Nevada. Final technical report

    SciTech Connect

    Barker, D.S.

    1986-07-28

    The Hamblin-Cleopatra volcano, selected for study because erosion and fault displacement have exposed the entire volcanic succession, the intrusive core, a radial dike systems, and sedimentary and volcanic rocks that predate and postdate the volcano, was investigated to estimate the proportions of igneous materials forming lava flows, pyroclastic deposits, intrusive bodies, and reworked debris. Chemical changes in the magma throughout the active period of the volcano were documented. The geothermal system active within the pile after activity ceased was reconstructed. (ACR)

  5. Controls on the composition of fluvial sands from a tropical weathering environment: sands of the Orinoco River drainage basin, Venezuela and Colombia

    USGS Publications Warehouse

    Johnsson, M.J.; Stallard, R.F.; Lundberg, N.

    1991-01-01

    On the alluvial plains of the western Llanos, storage of orogenically derived sediment allows time for substantial chemical weathering. Through reworking of the alluvial sequences, freshly eroded sediment is exchanged for older, compositionally more mature material. The chemically weathered component increases as rivers cross the Llanos, resulting in an increase in overall compositional maturity of bed-load sand away from the orogenic terranes. -from Authors

  6. Cost Effective Applications of High Integrity Software Processes

    DTIC Science & Technology

    2011-05-18

    Inspections/ peer reviews • Checklists • Programming Languages and Coding Standards • Static Code Analysis C d l it• o e comp ex y • Unit Testing...rom their own perspective © 2011 Lockheed Martin Corporation AER201103026 Inspection/ Peer Reviews • Reduce costly rework − Focus on defect removal... peer reviews ) to remove up to 80 percent of their defects • It doesn’t have to be hard − Reviews can be of many different types (very formal

  7. Biological and related chemical research concerning subseabed disposal of high-level nuclear waste: report of a workshop at Jackson Hole, Wyoming, January 12-16, 1981

    SciTech Connect

    Mullin, M.M.; Gomez, L.S.

    1981-10-01

    Following the introduction, this report contains: recommendations (research on radionuclide movement processes, research on radionuclide transport processes, administration and policy); abstracts of plenary talks (Large-Scale Distributions of Deep-Sea Benthic Organisms, Transfer Processes Between Water Column and Benthos, Particle Reworking and Biogeochemistry of Sediments, radioecological Aspects of Deep-Sea Waste Disposal of Radionuclides); summaries of subgroup discussions (geochemistry and microbiology, benthic biology, pelagic biology, radioecology); and appendices (model of physical-biological transfers, participants and institutional affiliations). (ATT)

  8. Integrated Mlitary-Civilian Workforce Analysis and Planning

    DTIC Science & Technology

    1976-08-01

    temporary personnel. This occurs most frequently in NIF (Naval Industrial Fund) related activities such as Naval Air Rework Facilities (NARF’s) and...squadrons. They also often lead to more reasonable estimates of attainable workforce size and structure, expecially for Navy Industrial Fund ( NIF ) activities...techniques. This policy is specifically important when adaressing the Naval Industrial Funded ( NIF ) activities."[18] The ADP support for linking the

  9. Microcomputer Checks Butt-Weld Accuracy

    NASA Technical Reports Server (NTRS)

    Clisham, W.; Garner, W.; Cohen, C.; Beal, J.; Polen, R.; Lloyd, J.

    1982-01-01

    Electrical gage and microcomputer eliminate time-consuming manual measurements. Alinement and angle of plates on either side of butt weld are measured and recorded automatically by hand-held gage and desk-top microcomputer. Gage/micro-computer quickly determine whether weld is within dimensional tolerances or whether reworking is needed. Microcomputer prints out measurements while operator moves gage from point to point along weld. Out-of-tolerance measurements are marked by an asterisk on printout.

  10. Source Inspection Scheduling Calendar

    NASA Technical Reports Server (NTRS)

    Hollis, Brayden

    2011-01-01

    Quality is an essential component for creating flight hardware travelling through space since the hardware is extremely expensive and cannot be reworked or repaired once launched. An important step in this process is ensuring the quality of hardware procured from Jet Propulsion Laboratory's (JPL) suppliers. An important element of determining supplier quality is source inspection. Source inspections are performed at suppliers' facilities by JPL employeesto ensure that hardware characteristics are acceptable before being covered up and/or delivered to JPL.

  11. Catalog of Existing Small Tools for Surface Preparation and Support Equipment for Blasters and Painters

    DTIC Science & Technology

    1977-05-01

    Mobile Blasting Machine 3.2.3.4 Texstar, Inc. Automatic Descaling Equipment 3.2.3.5 Future Development SPECIAL APPLICATIONS ABRASIVES 3.2.5.1...4220). A Cleco-Dresser horizontal grinder, Model 15 GEL -180, equipped with a Black & Decker 4" radial-type brush (Catalog No. 23201) can be useful in...Texstar’s Magstar machine performed ef- fectively, descaling mild rust and removing in- organic shop primer from the LNG. Some rework of the heavier

  12. Metrication of U.S. Shipbuilding - The Challenges and the Opportunities

    DTIC Science & Technology

    1993-10-01

    industry and consumers. These 1982 findings are summarized on the following page. Some of the Board’s functions were continued on a very limited scale...rework, and to the continuous conversions Hard technical and economic data concerning metrication on an industry -wide scale is very limited in its...SUPPLEMENTARY NOTES 14. ABSTRACT 15. SUBJECT TERMS 16. SECURITY CLASSIFICATION OF: 17. LIMITATION OF ABSTRACT SAR 18. NUMBER OF PAGES 216 19a. NAME

  13. Dimpled ball grid array process development for space flight applications

    NASA Technical Reports Server (NTRS)

    Barr, S. L.; Mehta, A.

    2000-01-01

    A 472 dimpled ball grid array (D-BGA) package has not been used in past space flight environments, therefore it was necessary to develop a process that would yield robust and reliable solder joints. The process developing assembly, inspection and rework techniques, were verified by conducting environmental tests. Since the 472 D-BGA packages passed the above environmental tests within the specifications, the process was successfully developed for space flight electronics.

  14. Implications of Fail-Forward in an Online Environment under Alternative Grading Schemes

    ERIC Educational Resources Information Center

    Patron, Hilde; Smith, William J.

    2011-01-01

    The concept of fail-forward can be used as a teaching technique to motivate students to learn from their mistakes. For example, when students are allowed to re-work incorrect responses on a test for a partial grade they are failing-forward. In this paper we look at the effects of failing-forward on student effort in online learning environments.…

  15. The revenue cycle: what it is, how it works, and how to enhance it.

    PubMed

    Niedzwiecki, Marilyn Hart

    2006-10-01

    Understanding the revenue cycle process helps perioperative personnel and managers improve health care charging practices and enables them to make informed policy decisions. Integrating knowledge of the revenue cycle processes throughout an organization can improve reimbursement, improve compliance with reporting requirements, reduce payer denials, and decrease rework by staff members. This article provides information to develop a basic understanding of the revenue cycle and makes suggestions on how to improve this process in health care organizations.

  16. Leading-Edge "Pop-Up" Spoiler For Airfoil

    NASA Technical Reports Server (NTRS)

    Wilson, John C.; Lance, Michael B.

    1991-01-01

    New concept places spoiler in leading edge of airfoil, hinged along its trailing edge, so airflow helps to deploy it and force it against mechanical stop. Deployed "pop-up" spoiler quickly eliminates almost all aerodynamic lift of stabilator. Designed to be added to leading edge of existing stabilator, without major rework. Though initial application to be on helicopter stabilators, equally applicable to wings or winglike components.

  17. Total quality development of material control and accountability software -- LANMAS

    SciTech Connect

    Yearsley, D.; McRae, L.P.

    1993-12-31

    Changing US Department of Energy (DOE) guidelines require Material Control and Accountability (MC and A) software to meet Total Quality certification requirements. Some MC and A software has met site quality standards, but only after extensive documentation rework. Mandating Total Quality methods during development virtually guarantees MC and A software certification. Throughout this discussion, the development of LANMAS will be used to illustrate the Total Quality software development process.

  18. Laser Rewelding of 304L Stainless Steel.

    SciTech Connect

    Maguire, Michael Christopher; Rodelas, Jeffrey

    2016-11-01

    Laser welding of 304L stainless steel during component fabrication has been found to alter the chemical composition of the steel due to material evaporation. During repair or rework, or during potential reuse/ rewelding of certain components, the potential exists to alter the composition to the extent that the material becomes prone to solidification cracking. This work aims to characterize the extent of this susceptibility in order to make informed decisions regarding rewelding practice and base metal chemistry allowances.

  19. Air Force Technical Objective Document, Aerospace Medical Division, FY 1987

    DTIC Science & Technology

    1986-01-01

    using digital subtrac- tion angiography and the accomplishment of a Holter monitoring data base will contribute to this goal. State-of-the-art...problems requiring both hard- ware and software re-work do not come to light until the flight test phase of development. This leads to significant...weapons, automation concepts, and technologies have been developed. These applications are digitally intense, software controlled and lead to the

  20. Forty Years of Research and Development at Griffiss Air Force Base, June 1951-June 1991

    DTIC Science & Technology

    1991-06-01

    Broadband Tee Sections Sperry Gyroscope Co. developed and constructed tees for all standard waveguide sizes for the frequency range 2600 to 40,000...Co. for rework, since it did not conform to Air Force specifications. Broadband Transmission Line Adapters RADC accepted delivery of two waveguide-to...type "N" adapters from Microwave Development Laboratory. The broadband transmission line adapter series developed under this program would cover the