Bilayer Structure and Lipid Dynamics in a Model Stratum Corneum...
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Bilayer Structure and Lipid Dynamics in a Model Stratum Corneum with Oleic Acid. Bilayer Structure and Lipid Dynamics in a Model Stratum Corneum with Oleic Acid. Abstract: The...
Water permeation through stratum corneum lipid bilayers from atomistic simulations
Chinmay Das; Peter D. Olmsted; Massimo G. Noro
2009-07-09T23:59:59.000Z
Stratum corneum, the outermost layer of skin, consists of keratin filled rigid non-viable corneocyte cells surrounded by multilayers of lipids. The lipid layer is responsible for the barrier properties of the skin. We calculate the excess chemical potential and diffusivity of water as a function of depth in lipid bilayers with compositions representative of the stratum corneum using atomistic molecular dynamics simulations. The maximum in the excess free energy of water inside the lipid bilayers is found to be twice that of water in phospholipid bilayers at the same temperature. Permeability, which decreases exponentially with the free energy barrier, is reduced by several orders of magnitude as compared to with phospholipid bilayers. The average time it takes for a water molecule to cross the bilayer is calculated by solving the Smoluchowski equation in presence of the free energy barrier. For a bilayer composed of a 2:2:1 molar ratio of ceramide NS 24:0, cholesterol and free fatty acid 24:0 at 300K, we estimate the permeability P=3.7e-9 cm/s and the average crossing time \\tau_{av}=0.69 ms. The permeability is about 30 times smaller than existing experimental results on mammalian skin sections.
Stratum Approaches to Temporal DBMS Implementation Kristian Torp Christian S. Jensen
Snodgrass, Richard T.
Stratum Approaches to Temporal DBMS Implementation Kristian Torp Christian S. Jensen Department temporal DBMSs have assumed that a temporal DBMS must be built from scratch, employing an integrated a temporal DBMS as a stratum on top of an existing non-temporal DBMS, rendering implementation more feasible
The effect of stratum thickness ratio on crossflow in a stratified petroleum reservoir
Kereluk, Michael Joseph
1966-01-01T23:59:59.000Z
THE EFFECT OF STRATUM THICKNESS RATIO ON CROSSFLOW IN A STRATIFIED PETROLEUM RESERVOIR A Thesis By Michael J. Kereluk Submitted to the Graduate College of the Texas A&M University in partial fulfillment of the requirements for the degree... of MASTER OF SCIENCE May 4966 Major Subject: Petroleum Engineering THE EFFECT OF STRATUM THICKNESS RATIO ON CROSSFLOW IN A STRATIFIED PETROLEUM RESERVOIR A Thesis By Michael I. Kereluk Approved as to style and content by: Chazrma of Com 'ttee...
The effect of stratum thickness ratio on crossflow in a stratified petroleum reservoir
Kereluk, Michael Joseph
1966-01-01T23:59:59.000Z
THE EFFECT OF STRATUM THICKNESS RATIO ON CROSSFLOW IN A STRATIFIED PETROLEUM RESERVOIR A Thesis By Michael J. Kereluk Submitted to the Graduate College of the Texas A&M University in partial fulfillment of the requirements for the degree... of MASTER OF SCIENCE May 4966 Major Subject: Petroleum Engineering THE EFFECT OF STRATUM THICKNESS RATIO ON CROSSFLOW IN A STRATIFIED PETROLEUM RESERVOIR A Thesis By Michael I. Kereluk Approved as to style and content by: Chazrma of Com 'ttee...
CUTANEOUS WATER LOSS AND LIPIDS OF THE STRATUM CORNEUM IN DUSKY ANTBIRDS, A LOWLAND
Williams, Jos. B.
estrato co´rneo, la capa ma´s externa de la epidermis, esta´ formado por ce´lulas aplanadas embebidas en
A study of bias in variance estimation with one unit per stratum
Kieffer, Grace Kloor
1967-01-01T23:59:59.000Z
for a line fit, k = 2, for number of strata, L = 5-15, and for a parabola, k = 3, for number of strata, L ~ 'B-15. i. 5 K 2 C INVERSE 0 IC91379E 02 -0 3568964E 01 -0 ~ 3568964E Cl 0 32198278 Ol -0 29310icE 00 -0. 3448277E-OL 0. 1431034f ol -0.... 5301722E 00 -0 /GH6205E 01 0. 1431034E 01 0 2931D35E-00 -0 3448273f-Ol 0 1603448f Dl -0 3448275E-OI -0 29\\1035E-00 0, 14 3 10 34E 0 I -0 5301722E 00 -0, 344827dE-DL 0. 3219827E Ol -0 3568965E 0 I -0, 40862OSE 01 0, 1431034E Ol -0 ' 293103/E-00 -o...
Tseng, Te-Yu; Yang, Chiu-Sheng; Chen, Yang-Fang [Department of Physics, National Taiwan University, Taipei, Taiwan (China); Tsai, Tsung-Hua [Department of Dermatology, Far Eastern Memorial Hospital, New Taipei City, Taiwan (China); Dong, Chen-Yuan, E-mail: cydong@phys.ntu.edu.tw [Department of Physics, National Taiwan University, Taipei, Taiwan (China); Center for Quantum Science and Engineering, National Taiwan University, Taipei, Taiwan (China); Center for Optoelectronic Biomedicine, National Taiwan University, Taipei, Taiwan (China)
2014-10-20T23:59:59.000Z
In this letter, we propose an efficient methodology of investigating dynamic properties of sulforhodamine B and rhodamine B hexyl ester molecules transporting across ex-vivo human stratum corneum with and without oleic acid enhancement. Three-dimensional, time-lapse fluorescence images of the stratum corneum can be obtained using two-photon fluorescence microscopy. Furthermore, temporal quantifications of transport enhancements in diffusion parameters can be achieved with the use of Fick's second law. Dynamic characterization of solutes transporting across the stratum corneum is an effective method for understanding transient phenomena in transdermal delivery of probe molecules, leading to improved delivery strategies of molecular species for therapeutic purposes.
Method for in situ heating of hydrocarbonaceous formations
Little, William E. (Morgantown, WV); McLendon, Thomas R. (Laramie, WY)
1987-01-01T23:59:59.000Z
A method for extracting valuable constituents from underground hydrocarbonaceous deposits such as heavy crude tar sands and oil shale is disclosed. Initially, a stratum containing a rich deposit is hydraulically fractured to form a horizontally extending fracture plane. A conducting liquid and proppant is then injected into the fracture plane to form a conducting plane. Electrical excitations are then introduced into the stratum adjacent the conducting plate to retort the rich stratum along the conducting plane. The valuable constituents from the stratum adjacent the conducting plate are then recovered. Subsequently, the remainder of the deposit is also combustion retorted to further recover valuable constituents from the deposit. Various R.F. heating systems are also disclosed for use in the present invention.
Ghosh, Saswata
2007-01-01T23:59:59.000Z
The stratum corneum (SC) of the skin functions as a barrier between the body and the environment. Surfactants such as Sodium Dodecyl Sulfate (SDS) are used in skin cleansers and in skin-care formulations because of their ...
Population Reference Bureau Kenneth W. Wachter
Wachter, Kenneth W.
-Recapture Estimates 2. Logistic Regression for Stratum Rates 3. Synthetic Estimation for Small Areas KWW p. 14/2 #12,000 households · American Community Survey: Reverse Record Check KWW p. 20/2 #12;References Bell, Robert and M
Niileksela, Christopher Robert
2012-05-31T23:59:59.000Z
--achievement relations. A three-stratum model of cognitive abilities based on Cattell-Horn-Carroll (CHC) theory was used in the analysis. Results showed that the factor structure and factor loadings of the CHC model were invariant among groups, and SLD group membership...
Copyright 2009 by ASME1 INTRODUCTION
Aguilar, Guillermo
. Cryopneumatic (CPx) is a new technology under development which combines the quick freezing of stratum cornuem-Aldrich Co. (St. Luis, MO). Porcine skin samples with intact SC were obtained from a local meat processor for 60 min. (a) (b) Figure 1. Experimental setup to freeze and stretch porcine skin: (a) R134a spurt; (b
Gupta, Vinay Kumar
12 INFLUENCE OF LIQUEFACTION ON PILE-SOIL INTERACTION IN VERTICAL VIBRATION B.K. Maheshwari*, U.K. Nath** and G. In such soil stratum, pile foundations may undergo substantial shaking while the soil is in a fully liquefied the liquefaction phenomenon. The Winkler soil model has been used to model the pile-soil interaction. Combining
capillary pressure must build up in the non- wetting fluid at the pore entrance; this pressure is given by P is typically much larger than the viscous pressure associated with flow into a pore. Consequently, the flow by balancing the stratum-scale viscous pressure driving the flow with the capillary pressure required to invade
Abstract--We examined the diel ver-tical distribution, concentration, and
than during the day, and there was evidence of larval diel vertical migration. Depth stratum. The 74 depth-stratified samples yielded 1571 fish larvae from 20 taxa, representing 11 families, and 128 increased from the surface to 50 m, then decreased with depth. Larval concentrations were higher at night
Biomass relations for components of five minnesota shrubs. Forest Service research paper
Buech, R.R.; Rugg, D.J.
1995-08-31T23:59:59.000Z
The tall shrub stratum is an important component of upland forests in the Lake States, especially of deciduous forest communities. The prevalance of tall shrubs has produced a recurring research interest in this stratum both in ecological studies and wildlife habitat surveys within the region. For such purposes, estimates of the biomass of tall shrubs or their component parts are often needed. The authors examine goodness of fit of two predictor variables (shrub height and stem diameter class) in three relations. The authors provide equations that use stem diameter class or stem diameter class and height to estimate biomass of six components of five shrub species, as well as generalized equations derived from a composite of all five species. Finally, the authors provide the information needed to construct standard errors for biomass estimates.
Barnhart, Kirstin Faye
2005-11-01T23:59:59.000Z
al, 2003; Paramio and Jorcano, 2002) and apoptosis (Dinsdale et al, 2004) and organization of cellular organelles (Kumemura et al, 2004) As with all intermediate filaments, keratins share a basic homologous structure that consists of a 310 amino... and 10 predominate in the normal suprabasal epidermis and stratum corneum (Steinert et al, 1993). To date, 49 different keratins (25 type I and 24 type II) have been identified (Coulombe and Omary, 2002). Type I and type II keratins were initially...
Davis, Ernest Edwin
1971-01-01T23:59:59.000Z
, Therefore, to get an overall indication of the sampled population's preferences, a weighting procedur'e was necessary. Those sampled persons returning the mailed questionnaire were considered as the responding stratum. Those sampled persons not returning... in the report, and determining what information should be presented in the interpretation column of the report. The data was collected by the use of a mail questionnaire sent to a random sample of 5, 112 readers of tbe Texas Livestock Narket News. Telephone...
Brooks, S.; Elswick, B.; Elliott, R. N.
2006-01-01T23:59:59.000Z
Efficiency and CHP Portfolio Standard that requires electric suppliers to obtain a percentage of their output from energy conservation services and CHP generation. Next, it abolished Back-up Power Rates for customers who develop customer-sited DER... four-tier stratum with regard to utility operations and friendliness toward the adoption of CHP. BACKGROUND CHP systems, also known as cogeneration, generate electricity and thermal energy in a single, integrated system (Elliott and Spurr 1999...
A BASIS FOR MODIFYING THE TANK 12 COMPOSITE SAMPLING DESIGN
Shine, G.
2014-11-25T23:59:59.000Z
The SRR sampling campaign to obtain residual solids material from the Savannah River Site (SRS) Tank Farm Tank 12 primary vessel resulted in obtaining appreciable material in all 6 planned source samples from the mound strata but only in 5 of the 6 planned source samples from the floor stratum. Consequently, the design of the compositing scheme presented in the Tank 12 Sampling and Analysis Plan, Pavletich (2014a), must be revised. Analytical Development of SRNL statistically evaluated the sampling uncertainty associated with using various compositing arrays and splitting one or more samples for compositing. The variance of the simple mean of composite sample concentrations is a reasonable standard to investigate the impact of the following sampling options. Composite Sample Design Option (a). Assign only 1 source sample from the floor stratum and 1 source sample from each of the mound strata to each of the composite samples. Each source sample contributes material to only 1 composite sample. Two source samples from the floor stratum would not be used. Composite Sample Design Option (b). Assign 2 source samples from the floor stratum and 1 source sample from each of the mound strata to each composite sample. This infers that one source sample from the floor must be used twice, with 2 composite samples sharing material from this particular source sample. All five source samples from the floor would be used. Composite Sample Design Option (c). Assign 3 source samples from the floor stratum and 1 source sample from each of the mound strata to each composite sample. This infers that several of the source samples from the floor stratum must be assigned to more than one composite sample. All 5 source samples from the floor would be used. Using fewer than 12 source samples will increase the sampling variability over that of the Basic Composite Sample Design, Pavletich (2013). Considering the impact to the variance of the simple mean of the composite sample concentrations, the recommendation is to construct each sample composite using four or five source samples. Although the variance using 5 source samples per composite sample (Composite Sample Design Option (c)) was slightly less than the variance using 4 source samples per composite sample (Composite Sample Design Option (b)), there is no practical difference between those variances. This does not consider that the measurement error variance, which is the same for all composite sample design options considered in this report, will further dilute any differences. Composite Sample Design Option (a) had the largest variance for the mean concentration in the three composite samples and should be avoided. These results are consistent with Pavletich (2014b) which utilizes a low elevation and a high elevation mound source sample and two floor source samples for each composite sample. Utilizing the four source samples per composite design, Pavletich (2014b) utilizes aliquots of Floor Sample 4 for two composite samples.
Stewart, Milton David
2001-01-01T23:59:59.000Z
GE) on Days 14 and 15 of the estrous cycle (Silvia and Raw, 1993; Charpigny et al. , 1997; Gray et al. , 2000). The sGE is the GE within the stratum compactum of the endometrium that is phenotypically identical to the LE. Pulsatile secretion of PGF.../or IRFs to suppress ERa and OTR expression in the LE and sGE. Although IFN~ suppresses ERa and OTR expression in the LE and sGE, it does not induce ISG expression in these cell types (Choi et al. , 2001). Instead, IFN~ induces ISG expression solely...
A study of possible trade routes between Egypt and Mesopotamia, ca. 3500-3100 B.C.
Mark, Samuel
1993-01-01T23:59:59.000Z
, Ilan, and M. Sebbane, "Copper Metallurgy, Trade, and the Urbanization of Southern Canaan in the Chalcolithic and Early Bronze Age, " in P. de Miroschedji, ed. , L' r ni ' n 1 P 1 'n ' 1' z n i n (Oxford 1989) 143; R. Gonen, "The Chalcolithic Period..., ed. , P in ' 1' This presence is reflected by stratum V at Tel Erani, See, Weinstein (supra n. 52) 63-64; Brandl (supra n. 52) 365. W, Ward, "Early Contacts Between Egypt, Canaan, and Sinai: Remarks on the Paper by Amnon Ben-Tor, " ~R 281 (1991) 14...
Instrumental Variable Analysis with a Nonlinear Exposure–Outcome Relationship
Burgess, Stephen; Davies, Neil M.; Thompson, Simon G.
2014-08-27T23:59:59.000Z
this merely reflects reverse causation (sick people lose weight) or confounding (underweight individuals dif- fer in other risk factors from those of average weight) or whether there is a causal effect of low BMi on increased mortality.3 in a randomized... as the sample size increases. either stratum- specific or sliding window estimates can equally be estimated with a binary outcome by using a log-linear or logistic analy- sis model to estimate a relative risk or odds ratio parameter. a localized average causal...
Moore, William
2015-07-24T23:59:59.000Z
testing of site 41NV670 was performed to determine the research potential of this unique site which consisted of a bison bone bed approximately 15 feet below the surface of a relict flood plain and within a heavy clay mantle. This investigation... was performed using shovel testing, excavation of two 1 x 1 meter test units, one backhoe trench, surface inspection of creek exposures, and an evaluation by a geomorphologist. Site 41NV670 consists of a stratum of bison bone identified as modern bison (Bison...
Armstrong, John G.; Gillham, Charles M. [Department of Radiation Oncology, St. Luke's Hospital, Dublin (Ireland); Dunne, Mary T., E-mail: mary.dunne@slh.ie [Clinical Trials Resource Unit, St. Luke's Hospital, Dublin (Ireland); Fitzpatrick, David A. [Department of Radiation Oncology, St. Luke's Hospital, Dublin (Ireland); Finn, Marie A.; Cannon, Mairin E. [Clinical Trials Resource Unit, St. Luke's Hospital, Dublin (Ireland); Taylor, Judy C. [Department of Nursing, St. Luke's Hospital, Dublin (Ireland); O'Shea, Carmel M. [Clinical Trials Resource Unit, St. Luke's Hospital, Dublin (Ireland); Buckney, Steven J. [Department of Physics, St. Luke's Hospital, Dublin (Ireland); Thirion, Pierre G. [Department of Radiation Oncology, St. Luke's Hospital, Dublin (Ireland)
2011-09-01T23:59:59.000Z
Purpose: To examine the long-term outcomes of a randomized trial comparing short (4 months; Arm 1) and long (8 months; Arm 2) neoadjuvant hormonal therapy before radiotherapy for localized prostate cancer. Methods and Materials: Between 1997 and 2001, 276 patients were enrolled and the data from 261 were analyzed. The stratification risk factors were prostate-specific antigen level >20 ng/mL, Gleason score {>=}7, and Stage T3 or more. The intermediate-risk stratum had one factor and the high-risk stratum had two or more. Staging was done from the bone scan and computed tomography findings. The primary endpoint was biochemical failure-free survival. Results: The median follow-up was 102 months. The overall survival, biochemical failure-free survival. and prostate cancer-specific survival did not differ significantly between the two treatment arms, overall or at 5 years. The cumulative probability of overall survival at 5 years was 90% (range, 87-92%) in Arm 1 and 83% (range, 80-86%) in Arm 2. The biochemical failure-free survival rate at 5 years was 66% (range, 62-71%) in Arm 1 and 63% (range, 58-67%) in Arm 2. Conclusion: No statistically significant difference was found in biochemical failure-free survival between 4 months and 8 months of neoadjuvant hormonal therapy before radiotherapy for localized prostate cancer.
Cozart, George Davis
1975-01-01T23:59:59.000Z
oz z Cn+ O ooe ? z g XO Q V) z&+ J o O o~~ i&Q LIGHT GRAY LOOSE SILTY SAND SM 13. 4 12. 6 1043 13. 4 13. 8 106$ SM 16. 3 26. 0 111. 6 I BX) Il 5. 0 IO TAN FIRM SILTY CLAY FIG. 4. -LOG OF BORING 2 SITE A - STATE HIGHWAY 30. (Ift ?. 305m...', I pcf ?16. 0lkg/m ) o w w X z 0 1- 8 DESCRIPTION OF STRATUM c( O w~ wm Z 0 z i Dol- 8 I-~c, Ou) ~) a&n +w 40. zv) w1 pww e1-o I c( E9 &wit I-3 L' CX zm 2 6. 7 E BROWN LOOSE SILTY SAND SM 15. 0 5. 1 98. 7 10. 9 6. 0 103. 9 6...
Hsu, Bertrand D. (Erie, PA); Leonard, Gary L. (Schenctady, NY)
1988-01-01T23:59:59.000Z
A fuel injection system particularly adapted for injecting coal slurry fuels at high pressures includes an accumulator-type fuel injector which utilizes high-pressure pilot fuel as a purging fluid to prevent hard particles in the fuel from impeding the opening and closing movement of a needle valve, and as a hydraulic medium to hold the needle valve in its closed position. A fluid passage in the injector delivers an appropriately small amount of the ignition-aiding pilot fuel to an appropriate region of a chamber in the injector's nozzle so that at the beginning of each injection interval the first stratum of fuel to be discharged consists essentially of pilot fuel and thereafter mostly slurry fuel is injected.
Detailed Studies of Hydrocarbon Radicals: C2H Dissociation
Wittig, Curt
2014-10-06T23:59:59.000Z
A novel experimental technique was examined whose goal was the ejection of radical species into the gas phase from a platform (film) of cold non-reactive material. The underlying principle was one of photo-initiated heat release in a stratum that lies below a layer of CO2 or a layer of amorphous solid water (ASW) and CO2. A molecular precursor to the radical species of interest is deposited near or on the film's surface, where it can be photo-dissociated. It proved unfeasible to avoid the rampant formation of fissures, as opposed to large "flakes." This led to many interesting results, but resulted in our aborting the scheme as a means of launching cold C2H radical into the gas phase. A journal article resulted that is germane to astrophysics but not combustion chemistry.
Statistical Analysis Of Tank 5 Floor Sample Results
Shine, E. P.
2012-08-01T23:59:59.000Z
Sampling has been completed for the characterization of the residual material on the floor of Tank 5 in the F-Area Tank Farm at the Savannah River Site (SRS), near Aiken, SC. The sampling was performed by Savannah River Remediation (SRR) LLC using a stratified random sampling plan with volume-proportional compositing. The plan consisted of partitioning the residual material on the floor of Tank 5 into three non-overlapping strata: two strata enclosed accumulations, and a third stratum consisted of a thin layer of material outside the regions of the two accumulations. Each of three composite samples was constructed from five primary sample locations of residual material on the floor of Tank 5. Three of the primary samples were obtained from the stratum containing the thin layer of material, and one primary sample was obtained from each of the two strata containing an accumulation. This report documents the statistical analyses of the analytical results for the composite samples. The objective of the analysis is to determine the mean concentrations and upper 95% confidence (UCL95) bounds for the mean concentrations for a set of analytes in the tank residuals. The statistical procedures employed in the analyses were consistent with the Environmental Protection Agency (EPA) technical guidance by Singh and others [2010]. Savannah River National Laboratory (SRNL) measured the sample bulk density, nonvolatile beta, gross alpha, and the radionuclide, elemental, and chemical concentrations three times for each of the composite samples. The analyte concentration data were partitioned into three separate groups for further analysis: analytes with every measurement above their minimum detectable concentrations (MDCs), analytes with no measurements above their MDCs, and analytes with a mixture of some measurement results above and below their MDCs. The means, standard deviations, and UCL95s were computed for the analytes in the two groups that had at least some measurements above their MDCs. The identification of distributions and the selection of UCL95 procedures generally followed the protocol in Singh, Armbya, and Singh [2010]. When all of an analyte's measurements lie below their MDCs, only a summary of the MDCs can be provided. The measurement results reported by SRNL are listed in Appendix A, and the results of this analysis are reported in Appendix B. The data were generally found to follow a normal distribution, and to be homogenous across composite samples.
STATISTICAL ANALYSIS OF TANK 5 FLOOR SAMPLE RESULTS
Shine, E.
2012-03-14T23:59:59.000Z
Sampling has been completed for the characterization of the residual material on the floor of Tank 5 in the F-Area Tank Farm at the Savannah River Site (SRS), near Aiken, SC. The sampling was performed by Savannah River Remediation (SRR) LLC using a stratified random sampling plan with volume-proportional compositing. The plan consisted of partitioning the residual material on the floor of Tank 5 into three non-overlapping strata: two strata enclosed accumulations, and a third stratum consisted of a thin layer of material outside the regions of the two accumulations. Each of three composite samples was constructed from five primary sample locations of residual material on the floor of Tank 5. Three of the primary samples were obtained from the stratum containing the thin layer of material, and one primary sample was obtained from each of the two strata containing an accumulation. This report documents the statistical analyses of the analytical results for the composite samples. The objective of the analysis is to determine the mean concentrations and upper 95% confidence (UCL95) bounds for the mean concentrations for a set of analytes in the tank residuals. The statistical procedures employed in the analyses were consistent with the Environmental Protection Agency (EPA) technical guidance by Singh and others [2010]. Savannah River National Laboratory (SRNL) measured the sample bulk density, nonvolatile beta, gross alpha, radionuclide, inorganic, and anion concentrations three times for each of the composite samples. The analyte concentration data were partitioned into three separate groups for further analysis: analytes with every measurement above their minimum detectable concentrations (MDCs), analytes with no measurements above their MDCs, and analytes with a mixture of some measurement results above and below their MDCs. The means, standard deviations, and UCL95s were computed for the analytes in the two groups that had at least some measurements above their MDCs. The identification of distributions and the selection of UCL95 procedures generally followed the protocol in Singh, Armbya, and Singh [2010]. When all of an analyte's measurements lie below their MDCs, only a summary of the MDCs can be provided. The measurement results reported by SRNL are listed in Appendix A, and the results of this analysis are reported in Appendix B. The data were generally found to follow a normal distribution, and to be homogeneous across composite samples.
Statistical Analysis of Tank 5 Floor Sample Results
Shine, E. P.
2013-01-31T23:59:59.000Z
Sampling has been completed for the characterization of the residual material on the floor of Tank 5 in the F-Area Tank Farm at the Savannah River Site (SRS), near Aiken, SC. The sampling was performed by Savannah River Remediation (SRR) LLC using a stratified random sampling plan with volume-proportional compositing. The plan consisted of partitioning the residual material on the floor of Tank 5 into three non-overlapping strata: two strata enclosed accumulations, and a third stratum consisted of a thin layer of material outside the regions of the two accumulations. Each of three composite samples was constructed from five primary sample locations of residual material on the floor of Tank 5. Three of the primary samples were obtained from the stratum containing the thin layer of material, and one primary sample was obtained from each of the two strata containing an accumulation. This report documents the statistical analyses of the analytical results for the composite samples. The objective of the analysis is to determine the mean concentrations and upper 95% confidence (UCL95) bounds for the mean concentrations for a set of analytes in the tank residuals. The statistical procedures employed in the analyses were consistent with the Environmental Protection Agency (EPA) technical guidance by Singh and others [2010]. Savannah River National Laboratory (SRNL) measured the sample bulk density, nonvolatile beta, gross alpha, and the radionuclide1, elemental, and chemical concentrations three times for each of the composite samples. The analyte concentration data were partitioned into three separate groups for further analysis: analytes with every measurement above their minimum detectable concentrations (MDCs), analytes with no measurements above their MDCs, and analytes with a mixture of some measurement results above and below their MDCs. The means, standard deviations, and UCL95s were computed for the analytes in the two groups that had at least some measurements above their MDCs. The identification of distributions and the selection of UCL95 procedures generally followed the protocol in Singh, Armbya, and Singh [2010]. When all of an analyte's measurements lie below their MDCs, only a summary of the MDCs can be provided. The measurement results reported by SRNL are listed, and the results of this analysis are reported. The data were generally found to follow a normal distribution, and to be homogenous across composite samples.
The landscape of G-structures in eight-manifold compactifications of M-theory
Babalic, Elena Mirela
2015-01-01T23:59:59.000Z
We consider spaces of "virtual" constrained generalized Killing spinors, i.e. spaces of Majorana spinors which correspond to "off-shell" $s$-extended supersymmetry in compactifications of eleven-dimensional supergravity based on eight-manifolds $M$. Such spaces naturally induce two stratifications of $M$, called the chirality and stabilizer stratification. For the case $s=2$, we describe the former using the canonical Whitney stratification of a three-dimensional semi-algebraic set ${\\cal R}$. We also show that the stabilizer stratification coincides with the rank stratification of a cosmooth generalized distribution ${\\cal D}_0$ and describe it explicitly using the Whitney stratification of a four-dimensional semi-algebraic set $\\mathfrak{P}$. The stabilizer groups along the strata are isomorphic with $\\mathrm{SU}(2)$, $\\mathrm{SU}(3)$, $\\mathrm{G}_2$ or $\\mathrm{SU}(4)$, where $\\mathrm{SU(2)}$ corresponds to the open stratum, which is generically non-empty. We also determine the rank stratification of a lar...
The landscape of G-structures in eight-manifold compactifications of M-theory
Elena Mirela Babalic; Calin Iuliu Lazaroiu
2015-05-09T23:59:59.000Z
We consider spaces of "virtual" constrained generalized Killing spinors, i.e. spaces of Majorana spinors which correspond to "off-shell" $s$-extended supersymmetry in compactifications of eleven-dimensional supergravity based on eight-manifolds $M$. Such spaces naturally induce two stratifications of $M$, called the chirality and stabilizer stratification. For the case $s=2$, we describe the former using the canonical Whitney stratification of a three-dimensional semi-algebraic set ${\\cal R}$. We also show that the stabilizer stratification coincides with the rank stratification of a cosmooth generalized distribution ${\\cal D}_0$ and describe it explicitly using the Whitney stratification of a four-dimensional semi-algebraic set $\\mathfrak{P}$. The stabilizer groups along the strata are isomorphic with $\\mathrm{SU}(2)$, $\\mathrm{SU}(3)$, $\\mathrm{G}_2$ or $\\mathrm{SU}(4)$, where $\\mathrm{SU(2)}$ corresponds to the open stratum, which is generically non-empty. We also determine the rank stratification of a larger generalized distribution ${\\cal D}$ which turns out to be integrable in the case of compactifications down to $\\mathrm{AdS}_3$.
Sampling Plan for Assaying Plates Containing Depleted or Normal Uranium
Ivan R. Thomas
2011-11-01T23:59:59.000Z
This paper describes the rationale behind the proposed method for selecting a 'representative' sample of uranium metal plates, portions of which will be destructively assayed at the Y-12 Security Complex. The total inventory of plates is segregated into two populations, one for Material Type 10 (depleted uranium (DU)) and one for Material Type 81 (normal [or natural] uranium (NU)). The plates within each population are further stratified by common dimensions. A spreadsheet gives the collective mass of uranium element (and isotope for DU) and the piece count of all plates within each stratum. These data are summarized in Table 1. All plates are 100% uranium metal, and all but approximately 60% of the NU plates have Kel-F{reg_sign} coating. The book inventory gives an overall U-235 isotopic percentage of 0.22% for the DU plates, ranging from 0.19% to 0.22%. The U-235 ratio of the NU plates is assumed to be 0.71%. As shown in Table 1, the vast majority of the plates are comprised of depleted uranium, so most of the plates will be sampled from the DU population.
Niger delta deepwater region petroleum potential assessment
Thomas, D. [Thomas and Associates, Hastings (United Kingdom)
1995-12-18T23:59:59.000Z
On behalf of the Nigerian Ministry of Petroleum and Natural Resources some 23,000 km of high quality 192 channel, 96 fold seismic, and associated gravity and magnetic data were acquired by TGSI-Mabon Geophysical Co. and made available to the industry in 1991. These data were collected over all deepwater blocks in conjunction with the planned 1993 license round. Later, during 1993 and 1994 TGSI with Mabon Ltd. and Stratum Petroleum Services extended the program onto the shelf (7,000 km) and into the ultra deepwater areas (6,400 km), making possible modern studies of the entire offshore delta complex. In assessing the petroleum potential of an undrilled region, it is useful to refer to analogous basins or provinces already with histories of hydrocarbon exploration and discovery. With this in mind, and using limited data from the already drilled areas of Nigeria offshore, the adjacent West Africa salt basin and Brazil in particular, an attempt is made to discuss the hydrocarbon habitat of the undrilled Niger delta deepwater offshore sedimentary sequences.
Response of South American ecosystems to precipitation variability
Ganguly, Auroop R [ORNL; Erickson III, David J [ORNL; Bras, Rafael L [ORNL
2009-12-01T23:59:59.000Z
The Ecosystem Demography Model 2 is a dynamic ecosystem model and land surface energy balance model. ED2 discretizes landscapes of particular terrain and meteorology into fractional areas of unique disturbance history. Each fraction, defined by a shared vertical soil column and canopy air space, contains a stratum of plant groups unique in functional type, size and number density. The result is a vertically distributed representation of energy transfer and plant dynamics (mortality, productivity, recruitment, disturbance, resource competition, etc) that successfully approximates the behaviour of individual-based vegetation models. In previous exercises simulating Amazonian land surface dynamics with ED2, it was observed that when using grid averaged precipitation as an external forcing the resulting water balance typically over-estimated leaf interception and leaf evaporation while under estimating through-fall and transpiration. To investigate this result, two scenario were conducted in which land surface biophysics and ecosystem demography over the Northern portion of South America are simulated over {approx}200 years: (1) ED2 is forced with grid averaged values taken from the ERA40 reanalysis meteorological dataset; (2) ED2 is forced with ERA40 reanalysis, but with its precipitation re-sampled to reflect statistical qualities of point precipitation found at rain gauge stations in the region. The findings in this study suggest that the equilibrium moisture states and vegetation demography are co-dependent and show sensitivity to temporal variability in precipitation. These sensitivities will need to be accounted for in future projections of coupled climate-ecosystem changes in South America.
Statistical techniques for characterizing residual waste in single-shell and double-shell tanks
Jensen, L., Fluor Daniel Hanford
1997-02-13T23:59:59.000Z
A primary objective of the Hanford Tank Initiative (HTI) project is to develop methods to estimate the inventory of residual waste in single-shell and double-shell tanks. A second objective is to develop methods to determine the boundaries of waste that may be in the waste plume in the vadose zone. This document presents statistical sampling plans that can be used to estimate the inventory of analytes within the residual waste within a tank. Sampling plans for estimating the inventory of analytes within the waste plume in the vadose zone are also presented. Inventory estimates can be used to classify the residual waste with respect to chemical and radiological hazards. Based on these estimates, it will be possible to make decisions regarding the final disposition of the residual waste. Four sampling plans for the residual waste in a tank are presented. The first plan is based on the assumption that, based on some physical characteristic, the residual waste can be divided into disjoint strata, and waste samples obtained from randomly selected locations within each stratum. The second plan is that waste samples are obtained from randomly selected locations within the waste. The third and fourth plans are similar to the first two, except that composite samples are formed from multiple samples. Common to the four plans is that, in the laboratory, replicate analytical measurements are obtained from homogenized waste samples. The statistical sampling plans for the residual waste are similar to the statistical sampling plans developed for the tank waste characterization program. In that program, the statistical sampling plans required multiple core samples of waste, and replicate analytical measurements from homogenized core segments. A statistical analysis of the analytical data, obtained from use of the statistical sampling plans developed for the characterization program or from the HTI project, provide estimates of mean analyte concentrations and confidence intervals on the mean. In addition, the statistical analysis provides estimates of spatial and measurement variabilities. The magnitude of these sources of variability are used to determine how well the inventory of the analytes in the waste have been estimated. This document provides statistical sampling plans that can be used to estimate the inventory of the analytes in the residual waste in single-shell and double-shell tanks and in the waste plume in the vadose zone.