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Sample records for appendix vi calculation

  1. 40 CFR Appendixes Vi-Vii to Part 600 - [Reserved

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 29 2010-07-01 2010-07-01 false VI Appendixes VI-VII to Part 600 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) ENERGY POLICY FUEL ECONOMY AND CARBON-RELATED EXHAUST EMISSIONS OF MOTOR VEHICLES Appendixes VI-VII to Part 600...

  2. Reactor safety study. An assessment of accident risks in U.S. commercial nuclear power plants. Appendix VI. Calculation of reactor accident consequences

    International Nuclear Information System (INIS)

    Information is presented concerning the radioactive releases from the containment following accidents; radioactive inventory of the reactor core; atmospheric dispersion; reactor sites and meteorological data; radioactive decay and deposition from plumes; finite distance of plume travel; dosimetric models; health effects; demographic data; mitigation of radiation exposure; economic model; and calculated results with consequence model

  3. Reactor safety study. An assessment of accident risks in U. S. commercial nuclear power plants. Appendix VI. Calculation of reactor accident consequences. [PWR and BWR

    Energy Technology Data Exchange (ETDEWEB)

    1975-10-01

    Information is presented concerning the radioactive releases from the containment following accidents; radioactive inventory of the reactor core; atmospheric dispersion; reactor sites and meteorological data; radioactive decay and deposition from plumes; finite distance of plume travel; dosimetric models; health effects; demographic data; mitigation of radiation exposure; economic model; and calculated results with consequence model.

  4. MCNP (trademark) ENDF/B-VI iron benchmark calculations

    Science.gov (United States)

    Court, J. D.; Hendricks, J. S.

    Four iron shielding benchmarks have been calculated for, we believe the first time, with MCNP4A and its new ENDF/B-VI library. These calculations are part of the Hiroshima/Nagasaki dose re-evaluation for the National Academy of Sciences and the Defense Nuclear Agency. We believe these calculations are significant because they validate MCNP and the new ENDF/B-VI libraries. These calculations are compared to ENDF/B-V, experiment, and in some cases the recommended MCNP data library (a T-2 evaluation) and ENDF/IV.

  5. 34 CFR Appendix B to Part 300 - Proportionate Share Calculation

    Science.gov (United States)

    2010-07-01

    ... 34 Education 2 2010-07-01 2010-07-01 false Proportionate Share Calculation B Appendix B to Part... CHILDREN WITH DISABILITIES Pt. 300, App. B Appendix B to Part 300—Proportionate Share Calculation Each LEA... early intervening activities in § 300.226). The following outlines the calculations for the example...

  6. 34 CFR Appendix A to Part 300 - Excess Costs Calculation

    Science.gov (United States)

    2010-07-01

    ... 34 Education 2 2010-07-01 2010-07-01 false Excess Costs Calculation A Appendix A to Part 300 Education Regulations of the Offices of the Department of Education (Continued) OFFICE OF SPECIAL EDUCATION... CHILDREN WITH DISABILITIES Pt. 300, App. A Appendix A to Part 300—Excess Costs Calculation Except...

  7. Final report from VFL Technologies for the pilot-scale thermal treatment of Lower East Fork Poplar Creek floodplain soils. LEFPC appendices. Volume 6. Appendix VI-X

    International Nuclear Information System (INIS)

    This final report from VFL Technologies for the pilot-scale thermal treatment of lower East Fork Poplar Creek floodplain soils dated September 1994 contains LEFPC Appendices, Volume 6, Appendix VI - X. These appendices cover the following areas: chain of custody, miscellaneous process calculations (residence time and orifice plate calculations), waste management (mercury and radiation confirmatory testing before and after final verification run), health and safety (training, respirator fit test and radiation work permits), and transportation (soil receipt documentation)

  8. KENO-VI Primer: A Primer for Criticality Calculations with SCALE/KENO-VI Using GeeWiz

    Energy Technology Data Exchange (ETDEWEB)

    Bowman, Stephen M [ORNL

    2008-09-01

    using SCALE/KENO-VI for criticality analyses; the SCALE/KENO-VI manual provides information on the use of SCALE/KENO-VI and all its modules. The primer also contains an appendix with sample input files.

  9. 40 CFR Appendix Vi to Part 265 - Compounds With Henry's Law Constant Less Than 0.1 Y/X

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 25 2010-07-01 2010-07-01 false Compounds With Henry's Law Constant... TREATMENT, STORAGE, AND DISPOSAL FACILITIES Pt. 265, App. VI Appendix VI to Part 265—Compounds With Henry's Law Constant Less Than 0.1 Y/X Compound name CAS No. Acetaldol 107-89-1 Acetamide 60-35-5...

  10. 20 CFR Appendix Vi to Subpart C of... - Percentage of Automatic Increases in Primary Insurance Amounts Since 1978

    Science.gov (United States)

    2010-04-01

    ... Insurance Amounts Since 1978 VI Appendix VI to Subpart C of Part 404 Employees' Benefits SOCIAL SECURITY ADMINISTRATION FEDERAL OLD-AGE, SURVIVORS AND DISABILITY INSURANCE (1950- ) Computing Primary Insurance Amounts... Primary Insurance Amounts Since 1978 Effective date Percentage increase 06/79 9.9 06/80 14.3 06/81 11.2...

  11. 40 CFR Appendix Vi to Part 264 - Political Jurisdictions 1 in Which Compliance With § 264.18(a) Must Be Demonstrated

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 25 2010-07-01 2010-07-01 false Political Jurisdictions 1 in Which Compliance With § 264.18(a) Must Be Demonstrated VI Appendix VI to Part 264 Protection of Environment...—Political Jurisdictions 1 in Which Compliance With § 264.18(a) Must Be Demonstrated Alaska Aleutian...

  12. 43 CFR Appendix A to Part 418 - Calculation of Efficiency Equation

    Science.gov (United States)

    2010-10-01

    ... 43 Public Lands: Interior 1 2010-10-01 2010-10-01 false Calculation of Efficiency Equation A Appendix A to Part 418 Public Lands: Interior Regulations Relating to Public Lands BUREAU OF RECLAMATION.... 418, App. A Appendix A to Part 418—Calculation of Efficiency Equation ER18DE97.008 ER18DE97.009...

  13. 10 CFR Appendix to Part 474 - Sample Petroleum-Equivalent Fuel Economy Calculations

    Science.gov (United States)

    2010-01-01

    ... 10 Energy 3 2010-01-01 2010-01-01 false Sample Petroleum-Equivalent Fuel Economy Calculations..., DEVELOPMENT, AND DEMONSTRATION PROGRAM; PETROLEUM-EQUIVALENT FUEL ECONOMY CALCULATION Pt. 474, App. Appendix to Part 474—Sample Petroleum-Equivalent Fuel Economy Calculations Example 1: An electric vehicle...

  14. 40 CFR Appendix II to Part 600 - Sample Fuel Economy Calculations

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 29 2010-07-01 2010-07-01 false Sample Fuel Economy Calculations II... FUEL ECONOMY AND CARBON-RELATED EXHAUST EMISSIONS OF MOTOR VEHICLES Pt. 600, App. II Appendix II to Part 600—Sample Fuel Economy Calculations (a) This sample fuel economy calculation is applicable...

  15. 12 CFR Appendix A to Part 230 - Annual Percentage Yield Calculation

    Science.gov (United States)

    2010-01-01

    ... 12 Banks and Banking 3 2010-01-01 2010-01-01 false Annual Percentage Yield Calculation A Appendix... Yield Calculation The annual percentage yield measures the total amount of interest paid on an account... percentage yield calculations for account disclosures and advertisements, while Part II discusses...

  16. 40 CFR Appendix III to Part 600 - Sample Fuel Economy Label Calculation

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 29 2010-07-01 2010-07-01 false Sample Fuel Economy Label Calculation III Appendix III to Part 600 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) ENERGY POLICY FUEL ECONOMY AND CARBON-RELATED EXHAUST EMISSIONS OF MOTOR VEHICLES Pt. 600, App....

  17. Calculation of 235U(n,n') cross sections for ENDF/B-VI

    International Nuclear Information System (INIS)

    Cross sections for neutron-induced reactions on 235U between 0.01 and 20 MeV have been calculated in a preliminary analysis for the ENDF/B-VI evaluation with particular emphasis on neutron inelastic scattering. A deformed optical model potential that fits total, elastic, inelastic, and low-energy average resonance data is used to calculate direct (n,n') cross sections and transmission coefficients for a Hauser-Feshbach statistical theory analysis using a multiple fission barrier representation. Direct cross sections for higher-lying vibrational states are provided from DWBA calculations, normalized using B(E/ital l/) values determined from (d,d') and Coulomb excitation data. Initial fission barrier parameters and transition state density enhancements appropriate to the compound systems involved were obtained from previous analyses, especially fits to charged-particle fission probability data. Further modifications to fit 235U(n,f) data were small, and the final fission parameters are generally consistent with published values. The results from this preliminary analysis are compared with the ENDF/B-V evaluation as well as with experimental data. 26 refs., 5 figs., 3 tabs

  18. 34 CFR Appendix C to Subpart B of... - 90/10 Revenue Calculation

    Science.gov (United States)

    2010-07-01

    ... 34 Education 3 2010-07-01 2010-07-01 false 90/10 Revenue Calculation C Appendix C to Subpart B of Part 668 Education Regulations of the Offices of the Department of Education (Continued) OFFICE OF... Revenue Calculation ER29OC09.006 ER29OC09.007 ER29OC09.008 ER29OC09.009...

  19. 45 CFR Appendix C to Part 1356 - Calculating Sample Size for NYTD Follow-Up Populations

    Science.gov (United States)

    2010-10-01

    ... 45 Public Welfare 4 2010-10-01 2010-10-01 false Calculating Sample Size for NYTD Follow-Up... REQUIREMENTS APPLICABLE TO TITLE IV-E Pt. 1356, App. C Appendix C to Part 1356—Calculating Sample Size for NYTD... applied when the sample is drawn from a population of one to 5,000 youth, because the sample is more...

  20. The calculational VVER burnup Credit Benchmark No.3 results with the ENDF/B-VI rev.5 (1999)

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez Gual, Maritza [Centro de Tecnologia Nuclear, La Habana (Cuba). E-mail: mrgual@ctn.isctn.edu.cu

    2000-07-01

    The purpose of this papers to present the results of CB3 phase of the VVER calculational benchmark with the recent evaluated nuclear data library ENDF/B-VI Rev.5 (1999). This results are compared with the obtained from the other participants in the calculations (Czech Republic, Finland, Hungary, Slovaquia, Spain and the United Kingdom). The phase (CB3) of the VVER calculation benchmark is similar to the Phase II-A of the OECD/NEA/INSC BUC Working Group benchmark for PWR. The cases without burnup profile (BP) were performed with the WIMS/D-4 code. The rest of the cases have been carried with DOTIII discrete ordinates code. The neutron library used was the ENDF/B-VI rev. 5 (1999). The WIMS/D-4 (69 groups) is used to collapse cross sections from the ENDF/B-VI Rev. 5 (1999) to 36 groups working library for 2-D calculations. This work also comprises the results of CB1 (obtained with ENDF/B-VI rev. 5 (1999), too) and CB3 for cases with Burnup of 30 MWd/TU and cooling time of 1 and 5 years and for case with Burnup of 40 MWd/TU and cooling time of 1 year. (author)

  1. 49 CFR Appendix A to Part 531 - Example of Calculating Compliance Under § 531.5(c)

    Science.gov (United States)

    2010-10-01

    ... FUEL ECONOMY STANDARDS Pt. 531, App. A Appendix A to Part 531—Example of Calculating Compliance Under... automobiles in MY 2012 as follows: Appendix A, Table 1 Model type Group Carline name Basic engine(L) Transmission class Description Actualmeasured fuel economy (mpg) Volume 1 PC A FWD 1.8 A5 2-door sedan 34.0...

  2. Structural Investigation of Methanol {6-[(2-oxidopropyliminomethyl] phenolato} dioxidomolybdenum(VI by X-Ray Crystallography and DFT Calculations

    Directory of Open Access Journals (Sweden)

    Iran SHEIKHSHOAIE

    2012-09-01

    Full Text Available This article presents the computational calculations of a cis-dioxomolybdenum(VI complex by using density functional theory (DFT with a DZP basis set (double zeta polarized basis set. The Schiff base 2-((E-(2-hydroxypropyliminomethyl-6-methoxyphenol was treated with MoO2(acac2 in dry methanol to produce the mononuclear complex methanol{2-methoxy-6-[(2-oxidopropyl iminomethyl]phenolato} dioxidomolybdenum(VI, whose structure has been solved and successfully refined in the monoclinic space group P21/c, with a = 6.755 Å, b = 15.835 Å, c = 13.119 Å, V = 1388.79 Å3, and Z = 4.

  3. Intercomparison of delayed neutron summation calculations among JEF2.2, ENDF/B-VI and JNDC-V2

    Energy Technology Data Exchange (ETDEWEB)

    Sagisaka, Mitsuyuki [Nagoya Univ. (Japan); Oyamatsu, K.; Kukita, Y.

    1998-03-01

    We perform intercomparison of delayed neutron activities calculated with JEF2.2, ENDF/B-VI and JNDC-V2 with a simple new method. Significant differences are found at t < 20 (s) for major fissioning systems. The differences are found to stem from fission yields or decay data of several nuclides. The list of these nuclides are also given for the future experimental determination of these nuclear data. (author)

  4. 49 CFR Appendix A to Part 533 - Example of Calculating Compliance Under § 533.5 Paragraph (g)

    Science.gov (United States)

    2010-10-01

    ... ECONOMY STANDARDS Pt. 533, App. A Appendix A to Part 533—Example of Calculating Compliance Under § 533.5... 2012 as follows: Appendix A, Table 1 Model type Group Carline name Basic engine(L) Transmission class Description Actualmeasured fuel economy (mpg) Volume 1 Pickup A 2WD 4 A5 Reg cab, MB 27.1 800 2 Pickup B 2WD...

  5. Radiation cooling and gain calculation for C VI 182 A line in C/Se plasma

    International Nuclear Information System (INIS)

    A model is developed which is capable of describing the evolution of gain resulting from both rapid radiative and expansion cooling of a recombining, freely expanding plasma. It is demonstrated for the particular case of a carbon/selenium plasma that the cooling rate which leads to optimal gain can be achieved by adjusting the admixture of an efficiently radiating material (selenium) in the gain medium (carbon). Comparison is made to a recent observation of gain in a recent NRL/Rochester experiment with carbon/selenium plasma for the n = 3 → 2 transition in C VI occurring at 182 A. The predicted maximum gain is approx.10 cm-1, as compared to observation of 2 to 3 cm-1

  6. 34 CFR Appendix to Subpart K of... - Determinations Under Section 8009 of the Act-Methods of Calculations for Treatment of Impact Aid...

    Science.gov (United States)

    2010-07-01

    ... 34 Education 1 2010-07-01 2010-07-01 false Determinations Under Section 8009 of the Act-Methods of Calculations for Treatment of Impact Aid Payments Under State Equalization Programs Appendix to Subpart K of... Act Pt. 222, Subpt. K, App. Appendix to Subpart K of Part 222—Determinations Under Section 8009 of...

  7. Actinide partitioning-transmutation program final report. VI. Short-term risk analysis of reprocessing, refabrication, and transportation: appendix

    International Nuclear Information System (INIS)

    The Chemical Technology Division of the Oak Ridge National Laboratory has prepared a set of documents that evaluate a Partitioning-Transmutation (PT) fuel cycle relative to a Reference cycle employing conventional fuel-material recovery methods. The PT cycle uses enhanced recovery methods so that most of the long-lived actinides are recycled to nuclear power plants and transmuted to shorter-lived materials, thereby reducing the waste toxicity. This report compares the two fuel cycles on the basis of the short-term radiological and nonradiological risks they present to the public and to workers. The accidental radiological risk to the public is analyzed by estimating the probabilities of sets of accidents; the consequences are calculated using the CRAC code appropriately modified for the material composition. Routine radiological risks to the public are estimated from the calculated release amounts; the effects are calculated using the CRAC code. Radiological occupational risks are determined from prior experience, projected standards, and estimates of accident risk. Nonradiological risks are calculated from the number of personnel involved, historical experience, and epidemiological studies. The result of this analysis is that the short-term risk of PT is 2.9 times greater than that of the Reference cycle, primarily due to the larger amount of industry. This conclusion is strongly dominated by the nonradiological risk, which is about 150 times greater than the radiological risk. The absolute risk as estimated for the fuel cycle portions considered in this report is 0.91 fatalities/GWe-year for the PT cycle and 0.34 fatalities/GWe-year for the Reference cycle. This should be compared with Inhaber's estimate of 1.5 for nuclear and 150 for coal. All of the risks assumed here are associated with the production of one billion watts of electricity (GWe) per year

  8. Actinide partitioning-transmutation program final report. VI. Short-term risk analysis of reprocessing, refabrication, and transportation: appendix

    Energy Technology Data Exchange (ETDEWEB)

    Fullwood, R.R.; Jackson, R.

    1980-01-01

    The Chemical Technology Division of the Oak Ridge National Laboratory has prepared a set of documents that evaluate a Partitioning-Transmutation (PT) fuel cycle relative to a Reference cycle employing conventional fuel-material recovery methods. The PT cycle uses enhanced recovery methods so that most of the long-lived actinides are recycled to nuclear power plants and transmuted to shorter-lived materials, thereby reducing the waste toxicity. This report compares the two fuel cycles on the basis of the short-term radiological and nonradiological risks they present to the public and to workers. The accidental radiological risk to the public is analyzed by estimating the probabilities of sets of accidents; the consequences are calculated using the CRAC code appropriately modified for the material composition. Routine radiological risks to the public are estimated from the calculated release amounts; the effects are calculated using the CRAC code. Radiological occupational risks are determined from prior experience, projected standards, and estimates of accident risk. Nonradiological risks are calculated from the number of personnel involved, historical experience, and epidemiological studies. The result of this analysis is that the short-term risk of PT is 2.9 times greater than that of the Reference cycle, primarily due to the larger amount of industry. This conclusion is strongly dominated by the nonradiological risk, which is about 150 times greater than the radiological risk. The absolute risk as estimated for the fuel cycle portions considered in this report is 0.91 fatalities/GWe-year for the PT cycle and 0.34 fatalities/GWe-year for the Reference cycle. This should be compared with Inhaber's estimate of 1.5 for nuclear and 150 for coal. All of the risks assumed here are associated with the production of one billion watts of electricity (GWe) per year.

  9. Structures of Plutonium(IV) and Uranium(VI) with N,N-Dialkyl Amides from Crystallography, X-ray Absorption Spectra, and Theoretical Calculations.

    Science.gov (United States)

    Acher, Eléonor; Hacene Cherkaski, Yanis; Dumas, Thomas; Tamain, Christelle; Guillaumont, Dominique; Boubals, Nathalie; Javierre, Guilhem; Hennig, Christoph; Solari, Pier Lorenzo; Charbonnel, Marie-Christine

    2016-06-01

    The structures of plutonium(IV) and uranium(VI) ions with a series of N,N-dialkyl amides ligands with linear and branched alkyl chains were elucidated from single-crystal X-ray diffraction (XRD), extended X-ray absorption fine structure (EXAFS), and theoretical calculations. In the field of nuclear fuel reprocessing, N,N-dialkyl amides are alternative organic ligands to achieve the separation of uranium(VI) and plutonium(IV) from highly concentrated nitric acid solution. EXAFS analysis combined with XRD shows that the coordination structure of U(VI) is identical in the solution and in the solid state and is independent of the alkyl chain: two amide ligands and four bidentate nitrate ions coordinate the uranyl ion. With linear alkyl chain amides, Pu(IV) also adopt identical structures in the solid state and in solution with two amides and four bidentate nitrate ions. With branched alkyl chain amides, the coordination structure of Pu(IV) was more difficult to establish unambiguously from EXAFS. Density functional theory (DFT) calculations were consequently performed on a series of structures with different coordination modes. Structural parameters and Debye-Waller factors derived from the DFT calculations were used to compute EXAFS spectra without using fitting parameters. By using this methodology, it was possible to show that the branched alkyl chain amides form partly outer-sphere complexes with protonated ligands hydrogen bonded to nitrate ions. PMID:27171842

  10. Development Program of LOCA Licensing Calculation Capability with RELAP5-3D in Accordance with Appendix K of 10 CFR 50.46

    International Nuclear Information System (INIS)

    In light water reactors, particularly the pressurized water reactors, the severity of loss-of-coolant accidents (LOCAs) will limit how high the reactor power can extend. Although the best-estimate LOCA methodology can provide the greatest margin on the peak cladding temperature (PCT) evaluation during LOCA, it will take many more resources to develop and to get final approval from the licensing authority. Instead, implementation of evaluation models required by Appendix K of the Code of Federal Regulations, Title 10, Part 50 (10 CFR 50), upon an advanced thermal-hydraulic platform can also gain significant margin on the PCT calculation. A program to modify RELAP5-3D in accordance with Appendix K of 10 CFR 50 was launched by the Institute of Nuclear Energy Research, Taiwan, and it consists of six sequential phases of work. The compliance of the current RELAP5-3D with Appendix K of 10 CFR 50 has been evaluated, and it was found that there are 11 areas where the code modifications are required to satisfy the requirements set forth in Appendix K of 10 CFR 50. To verify and assess the development of the Appendix K version of RELAP5-3D, nine kinds of separate-effect experiments and six sets of integral-effect experiments will be adopted. Through the assessments program, all the model changes will be verified

  11. Single event upsets calculated from new ENDF/B-VI proton and neutron data up to 150 MeV

    Energy Technology Data Exchange (ETDEWEB)

    Chadwick, M.B. [Los Alamos National Lab., NM (United States). Theoretical Div.; Normand, E. [Boeing Military Aircraft and Missile Systems, Seattle, WA (United States)

    1999-06-01

    Single-event upsets (SEU) in microelectronics are calculated from newly-developed silicon nuclear reaction recoil data that extend up to 150 MeV, for incident protons and neutrons. Calculated SEU cross sections are compared with measured data.

  12. [Project PEACH: A Prescriptive Educational Approach for Children with Handicaps. E.S.E.A. - Title VI-B. 1976-1977, and Appendix]. Report #77154.

    Science.gov (United States)

    Scheiner, Louis

    The School District of Philadelphia, through its Prescriptive Educational Approach to Children with Handicaps (PEACH) Project, funded under E.S.E.A. Title VI-B, provided diagnostic, referral, and prescriptive educational services for preschool children (between 3 and 4.7 years). Priority was given to those children most severely handicapped and…

  13. Density functional theory calculations of the redox potentials of actinide(VI)/actinide(V) couple in water

    International Nuclear Information System (INIS)

    The measured redox potential of an actinide at an electrode surface involves the transfer of a single electron from the electrode surface on to the actinide center. Before electron transfer takes place, the complexing ligands and molecules of solvation need to become structurally arranged such that the electron transfer is at its most favorable. Following the electron transfer, there is further rearrangement to obtain the minimum energy structure for the reduced state. As such, there are three parts to the total energy cycle required to take the complex from its ground state oxidized form to its ground state reduced form. The first part of the energy comes from the structural rearrangement and solvation energies of the actinide species before the electron transfer or charge transfer process; the second part, the energy of the electron transfer; the third part, the energy required to reorganize the ligands and molecules of solvation around the reduced species. The time resolution of electrochemical techniques such as cyclic voltammetry is inadequate to determine to what extent bond and solvation rearrangement occurs before or after electron transfer; only for a couple to be classed as reversible is it fast in terms of the experimental time. Consequently, the partitioning of the energy theoretically is of importance to obtain good experimental agreement. Here we investigate the magnitude of the instantaneous charge transfer through calculating the fast one electron reduction energies of AnO2(H2O)n2+, where An = U, Np, and Pu, for n = 4-6, in solution without inclusion of the structural optimization energy of the reduced form. These calculations have been performed using a number of DFT functionals, including the recently developed functionals of Zhao and Truhlar. The results obtained for calculated electron affinities in the aqueous phase for the AnO2(H2O)52+/+ couples are within 0.04 V of accepted experimental redox potentials, nearly an order of magnitude

  14. Detection of the nanomolar level of total Cr[(iii) and (vi)] by functionalized gold nanoparticles and a smartphone with the assistance of theoretical calculation models

    Science.gov (United States)

    Chen, Wenwen; Cao, Fengjing; Zheng, Wenshu; Tian, Yue; Xianyu, Yunlei; Xu, Peng; Zhang, Wei; Wang, Zhuo; Deng, Ke; Jiang, Xingyu

    2015-01-01

    We report a method for rapid, effective detection of both Cr(iii) and Cr(vi) (in the form of Cr3+ and Cr2O72-, the main species of chromium in the natural environment) by making use of meso-2,3-dimercaptosuccinic acid (DMSA)-functionalized gold nanoparticles (Au NPs). The limit of detection (LOD) is 10 nM with the naked eye and the assay can be applied in detecting chromium in polluted soil from Yun-Nan Province in Southwest China. We use density functional theory to calculate the change of the Gibbs free energy (ΔG) of the interactions between the DMSA-Au NP system and various metal ions, which shows that DMSA-Au NPs have high specificity for both Cr3+ and Cr2O72-.We report a method for rapid, effective detection of both Cr(iii) and Cr(vi) (in the form of Cr3+ and Cr2O72-, the main species of chromium in the natural environment) by making use of meso-2,3-dimercaptosuccinic acid (DMSA)-functionalized gold nanoparticles (Au NPs). The limit of detection (LOD) is 10 nM with the naked eye and the assay can be applied in detecting chromium in polluted soil from Yun-Nan Province in Southwest China. We use density functional theory to calculate the change of the Gibbs free energy (ΔG) of the interactions between the DMSA-Au NP system and various metal ions, which shows that DMSA-Au NPs have high specificity for both Cr3+ and Cr2O72-. Electronic supplementary information (ESI) available: ΔG of the interactions between the DMSA-AuNPs and various metal ions, models of the metal ions (Mn+) and six water molecules, DLS results for DMSA-Au NPs before and after adding Cr3+, Cr2O72-, Cr3+ and Cr2O72- mixtures, comparison of the performance of different sensors. See DOI: 10.1039/c4nr06726f

  15. Mucopolysaccharidosis VI

    OpenAIRE

    Harmatz Paul; Nicely Helen; Valayannopoulos Vassili; Turbeville Sean

    2010-01-01

    Abstract Mucopolysaccharidosis VI (MPS VI) is a lysosomal storage disease with progressive multisystem involvement, associated with a deficiency of arylsulfatase B leading to the accumulation of dermatan sulfate. Birth prevalence is between 1 in 43,261 and 1 in 1,505,160 live births. The disorder shows a wide spectrum of symptoms from slowly to rapidly progressing forms. The characteristic skeletal dysplasia includes short stature, dysostosis multiplex and degenerative joint disease. Rapidly ...

  16. Pressure-induced phonon freezing in the ZnSeS II–VI mixed crystal: phonon–polaritons and ab initio calculations

    Science.gov (United States)

    Hajj Hussein, R.; Pagès, O.; Polian, A.; Postnikov, A. V.; Dicko, H.; Firszt, F.; Strzałkowski, K.; Paszkowicz, W.; Broch, L.; Ravy, S.; Fertey, P.

    2016-05-01

    Near-forward Raman scattering combined with ab initio phonon and bond length calculations is used to study the ‘phonon–polariton’ transverse optical modes (with mixed electrical–mechanical character) of the II–VI ZnSe1‑x S x mixed crystal under pressure. The goal of the study is to determine the pressure dependence of the poorly-resolved percolation-type Zn–S Raman doublet of the three oscillator [1  ×  (Zn–Se), 2  ×  (Zn–S)] ZnSe0.68S0.32 mixed crystal, which exhibits a phase transition at approximately the same pressure as its two end compounds (~14 GPa, zincblende  →  rocksalt), as determined by high-pressure x-ray diffraction. We find that the intensity of the lower Zn–S sub-mode of ZnSe0.68S0.32, due to Zn–S bonds vibrating in their own (S-like) environment, decreases under pressure (Raman scattering), whereas its frequency progressively converges onto that of the upper Zn–S sub-mode, due to Zn–S vibrations in the foreign (Se-like) environment (ab initio calculations). Ultimately, only the latter sub-mode survives. A similar ‘phonon freezing’ was earlier evidenced with the well-resolved percolation-type Be–Se doublet of Zn1‑x Be x Se (Pradhan et al 2010 Phys. Rev. B 81 115207), that exhibits a large contrast in the pressure-induced structural transitions of its end compounds. We deduce that the above collapse/convergence process is intrinsic to the percolation doublet of a short bond under pressure, at least in a ZnSe-based mixed crystal, and not due to any pressure-induced structural transition.

  17. Pressure-induced phonon freezing in the ZnSeS II-VI mixed crystal: phonon-polaritons and ab initio calculations.

    Science.gov (United States)

    Hajj Hussein, R; Pagès, O; Polian, A; Postnikov, A V; Dicko, H; Firszt, F; Strzałkowski, K; Paszkowicz, W; Broch, L; Ravy, S; Fertey, P

    2016-05-25

    Near-forward Raman scattering combined with ab initio phonon and bond length calculations is used to study the 'phonon-polariton' transverse optical modes (with mixed electrical-mechanical character) of the II-VI ZnSe1-x S x mixed crystal under pressure. The goal of the study is to determine the pressure dependence of the poorly-resolved percolation-type Zn-S Raman doublet of the three oscillator [1  ×  (Zn-Se), 2  ×  (Zn-S)] ZnSe0.68S0.32 mixed crystal, which exhibits a phase transition at approximately the same pressure as its two end compounds (~14 GPa, zincblende  →  rocksalt), as determined by high-pressure x-ray diffraction. We find that the intensity of the lower Zn-S sub-mode of ZnSe0.68S0.32, due to Zn-S bonds vibrating in their own (S-like) environment, decreases under pressure (Raman scattering), whereas its frequency progressively converges onto that of the upper Zn-S sub-mode, due to Zn-S vibrations in the foreign (Se-like) environment (ab initio calculations). Ultimately, only the latter sub-mode survives. A similar 'phonon freezing' was earlier evidenced with the well-resolved percolation-type Be-Se doublet of Zn1-x Be x Se (Pradhan et al 2010 Phys. Rev. B 81 115207), that exhibits a large contrast in the pressure-induced structural transitions of its end compounds. We deduce that the above collapse/convergence process is intrinsic to the percolation doublet of a short bond under pressure, at least in a ZnSe-based mixed crystal, and not due to any pressure-induced structural transition. PMID:27114448

  18. Calculations of Maxwellian-averaged Cross Sections and Astrophysical Reaction Rates Using the ENDF/B-VII.0, JEFF-3.1, JENDL-3.3 and ENDF/B-VI.8 Evaluated Nuclear Reaction Data Libraries

    OpenAIRE

    Pritychenko, B.; Mughaghab, S. F.; Sonzogni, A. A.

    2009-01-01

    We calculated the Maxwellian-averaged cross sections (MACS) and astrophysical reaction rates of the stellar nucleosynthesis reactions (n,$\\gamma$), (n,fission), (n,p), (n,$\\alpha$) and (n,2n) using the ENDF/B-VII.0-, JEFF-3.1-, JENDL-3.3-, and ENDF/B-VI.8-evaluated nuclear-data libraries. Four major nuclear reaction libraries were processed under the same conditions for Maxwellian temperatures ({\\it kT}) ranging from 1 keV to 1 MeV. We compare our current calculations of the {\\it s}-process n...

  19. 40 CFR Appendix Xvi to Part 86 - Pollutant Mass Emissions Calculation Procedure for Gaseous-Fueled Vehicles and for Vehicles...

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 19 2010-07-01 2010-07-01 false Pollutant Mass Emissions Calculation... Mass Emissions Calculation Procedure for Gaseous-Fueled Vehicles and for Vehicles Equipped With...-Fueled Vehicle Pollutant Mass Emission Calculation Procedure. (1) For all TLEVs, LEVs, and ULEVs,...

  20. Mucopolysaccharidosis VI

    Directory of Open Access Journals (Sweden)

    Harmatz Paul

    2010-04-01

    Full Text Available Abstract Mucopolysaccharidosis VI (MPS VI is a lysosomal storage disease with progressive multisystem involvement, associated with a deficiency of arylsulfatase B leading to the accumulation of dermatan sulfate. Birth prevalence is between 1 in 43,261 and 1 in 1,505,160 live births. The disorder shows a wide spectrum of symptoms from slowly to rapidly progressing forms. The characteristic skeletal dysplasia includes short stature, dysostosis multiplex and degenerative joint disease. Rapidly progressing forms may have onset from birth, elevated urinary glycosaminoglycans (generally >100 μg/mg creatinine, severe dysostosis multiplex, short stature, and death before the 2nd or 3rd decades. A more slowly progressing form has been described as having later onset, mildly elevated glycosaminoglycans (generally ARSB gene, located in chromosome 5 (5q13-5q14. Over 130 ARSB mutations have been reported, causing absent or reduced arylsulfatase B (N-acetylgalactosamine 4-sulfatase activity and interrupted dermatan sulfate and chondroitin sulfate degradation. Diagnosis generally requires evidence of clinical phenotype, arylsulfatase B enzyme activity ®, clinical management was limited to supportive care and hematopoietic stem cell transplantation. Galsulfase is now widely available and is a specific therapy providing improved endurance with an acceptable safety profile. Prognosis is variable depending on the age of onset, rate of disease progression, age at initiation of ERT and on the quality of the medical care provided.

  1. Sulfur K-edge X-ray Absorption Spectroscopy and Density Functional Calculations on Mo(IV) and Mo(VI)=O Bis-dithiolenes: Insights into the Mechanism of Oxo Transfer in DMSO Reductase and Related Functional Analogues

    OpenAIRE

    Tenderholt, Adam L.; Wang, Jun-Jieh; Szilagyi, Robert K.; Holm, Richard H.; Hodgson, Keith O.; Hedman, Britt; Solomon, Edward I.

    2010-01-01

    Sulfur K-edge X-ray absorption spectroscopy (XAS) and density functional theory (DFT) calculations have been used to determine the electronic structures of two Mo bis-dithiolene complexes, [Mo(OSi)(bdt)2]1− and [MoO(OSi)(bdt)2]1− where OSi = [OSiPh2tBu]1− and bdt = benzene-1,2-dithiolate(2−), that model the Mo(IV) and Mo(VI)=O states of the DMSO reductase family of molybdenum enzymes. These results show that the Mo(IV) complex undergoes metal-based oxidation unlike the Mo(IV) tris-dithiolene ...

  2. Appendix Cancer

    Science.gov (United States)

    ... are here Home > Types of Cancer > Appendix Cancer Appendix Cancer This is Cancer.Net’s Guide to Appendix Cancer. Use the menu below to choose the ... social workers, and patient advocates. Cancer.Net Guide Appendix Cancer Introduction Statistics Risk Factors Symptoms and Signs ...

  3. Appendix (image)

    Science.gov (United States)

    The appendix is near the junction of the small bowel and the colon. On occasion, it may become infected. ... It is treated by surgical removal of the appendix (appendectomy). Recovery time for uncomplicated appendicitis is usually ...

  4. Customization of ENDF/B-VI and JENDL3.2 basic data for MCNP calculation and measurements on neutron cross section at INST, AERE, Savar

    Energy Technology Data Exchange (ETDEWEB)

    Bhuiyan, S.I.; Molla, N.I.; Chakrobortty, T.K.; Huda, M.Q.; Mondal, M.A.W. [Institute of Nuclear Science and Technology (INST), Atomic Energy Research Establishment, Savar, Dhaka (Bangladesh)

    2000-03-01

    The NJOY94.10{sup +}, a version of NJOY, has been installed in a VAX computer under Open VMS operating system. ENDF/B-VI, latest release of ENDF data, has been also implemented in the same system. A data library has been processed using the modules RECONR, BROADR and ACER of NJOY code. MCNP4B2 computer code has been used to validate the prepared data library for some benchmark experiments. The results obtained have been found to be in good agreement with the experimental results. Excitation function have been measured for {sup 81}Br(n,alpha){sup 78}As, {sup 79}Br(n,alpha){sup 76}As, {sup 73}Ge(n,p){sup 73}Ga, {sup 72}Ge(n,p){sup 72}Ga, {sup 64}Zn(n,p){sup 64}Cu, {sup 68}Zn(n,alpha){sup 65}Ni, and {sup 70}Zn(n,2n){sup 69m}Zn reactions in the neutron energy range 13.57-14.71 MeV via Activation technique. (author)

  5. Augmentation of ENDF/B fission product gamma-ray spectra by calculated spectra

    International Nuclear Information System (INIS)

    Gamma-ray spectral data of the ENDF/B-V fission product decay data file have been augmented by calculated spectra. The calculations were performed with a model using beta strength functions and cascade gamma-ray transitions. The calculated spectra were applied to individual fission product nuclides. Comparisons with several hundred measured aggregate gamma spectra after fission were performed to confirm the applicability of the calculated spectra. The augmentation was extended to a preliminary ENDF/B-VI file, and to beta spectra. Appendix C provides information on the total decay energies for individual products and some comparisons of measured and aggregate values based on the preliminary ENDF/B-VI files. 15 refs., 411 figs

  6. Cu vi parolas Esperante?

    Institute of Scientific and Technical Information of China (English)

    Andrzej; Pettyn

    1999-01-01

    LA DEKDUA LECIONOu vi longe atendis min?—Danuta:Saluton,Banjo!—Barbara:Saluton!—D:Cu vi longe atendis min?—B:Tute ne.Mi jus venis i tien.—D:Mi esperas,ke nun vi estas libera.—B:Mi estas tute libera,do ni povas iriien,kien vi deziras.—D:Bone.Mi proponas do,ke unue niiru al magazenoj fari aetojn kaj

  7. Cu vi parolas Esperante?

    Institute of Scientific and Technical Information of China (English)

    Andrzej; Pettyn

    1999-01-01

    LA DEKA LECIONOKiom da mono vi bezonas?—Barbara:Mi foriras aeti ion pormani.u vi deziras ion de mi?—Sinjoro Petro(la edzo de Barbara):Aetu por mi skatolon da cigaredoj aǔeble...aetu por mi du skatolojn dacigaredoj kaj unu skatolon da alume-toj.—B:Bone.u vi ankoraǔ deziras ion?—P:Ne,dankon.Estasio.u vihavas monon?

  8. Monte Carlo Eigenvalue Calculations with ENDF/B-VI.8, JEFF-3.0, and JENDL-3.3 Cross Sections for a Selection of International Criticality Safety Benchmark Evaluation Project Handbook Benchmarks

    International Nuclear Information System (INIS)

    Continuous-energy Monte Carlo eigenvalue calculations have been performed for a selection of HEU-MET-FAST, IEU-MET-FAST, HEU-SOL-THERM, LEU-COMP-THERM, and LEU-SOL-THERM benchmarks using ENDF/B (primarily VI.8), JEFF-3.0, and JENDL-3.3 cross sections. These benchmarks allow for testing the cross-section data for both common reactor nuclides such as 1H, 16O, and 235,238U and structural and shielding elements such as Al, Ti, Fe, Ni, and Pb. The latest cross-section libraries yield near-unity eigenvalues for unreflected or water-reflected HEU-SOL-THERM and LEU-SOL-THERM systems. Near-unity eigenvalues are also obtained for bare HEU-MET-FAST and IEU-MET-FAST systems, but small deviations from unity are observed in both FAST and THERM benchmarks as a function of nonhydrogenous reflector material and thickness. The long-standing problem of lower eigenvalues in water-reflected low-enriched-uranium fuel lattice systems remains, regardless of cross-section library

  9. Population inversion and gain calculations for 4p54d-4p55p and 4p55s - 4p55p Kr-like transitions in Y IV, Zr V, Nb VI and Mo VII

    International Nuclear Information System (INIS)

    We present calculations of the quasi-steady state gain coefficient for the 4p54d 1P-4p55p 1/2[1/2]0 transition in Kr-like Y IV, Zr V, Nb VI and Mo VII ions. Gain coefficients which can lead to FUV-VUV (∝260 to 60 nm) lasing are found in all ions. Large gain coefficients are found for each ion at temperatures in excess of the ion's equilibrium temperature; realizing lasing in these systems will require a transient excitation mechanism. The density at which the maximal gain coefficient obtains increases for increasing ionization state. The 4p55s 1/2[1/2]1-4p55p 1/2[1/2]0 and 4p55s 3/2[3/2]1-4p55p 1/2[1/2]0 transitions also show population inversion and modest gain coefficients. Attractive features of these ions as potential lasents are the large ratio between the energy of the lasing transition and the excitation energy of the upper level of the lasing transition as well as the case with which they are produced in a low temperature, table-top scale plasma source. (orig.)

  10. Predictive calculations to assess the long-term effect of cementitious materials on the pH and solubility of uranium(VI) in a shallow land disposal environment

    International Nuclear Information System (INIS)

    One proposed method of low-level radioactive waste (LLW) disposal is to mix the radioactive waste streams with cement, place the mixture in steel barrels, and dispose of the barrels in near-surface unsaturated sediments. Cement or concrete is frequently used in burial grounds, because cement porewaters are buffered at high pH values and lanthanides and actinides; are very insoluble in highly alkaline environments. Therefore, leaching of these contaminants from the combined cement/low-level radioactive waste streams will at least initially be retarded. The calculations performed in this study demonstrate that the pH of cement porewaters will be maintained at a value greater than 10 for 10,000 years under Hanford specific hydrogeochemical conditions. Ten thousand years is the period generally studied in longterm performance assessments per regulatory guidance. The concentrations of dissolved hexavalent uranium [U(VI)], the valence form of dissolved U usually present in oxidizing surface and groundwaters, are also constrained by the high pH and predicted solution compositions over the 10,000-year period, which is favorable from a long-term performance perspective

  11. Cu vi parolas Esperante?

    Institute of Scientific and Technical Information of China (English)

    Andrzej; Pettyn

    2000-01-01

    LA DEKKVARA LEOIONOMi havas por vi surprizon—Barbara:Bonan matenon!—Petro:Bonan matenon,mia kara!—B Mi havas pot vi surprizon.—P:Viiam havas pot mi surprizojn.—B:Sed hodiaǔ mi parolas treserioze."Okaze de via naskitago ak-

  12. Appendix section

    International Nuclear Information System (INIS)

    These appendixes present a paper on the interaction of X and gamma radiation with matter. Some examples of manual and several worksheets for maintenance from weekly to annually, a worksheet for radiometric survey and 2 articles are also presented

  13. Investigations on the molecular structure of water dissolved and hematite-sorbed uranium(VI) complexes with aliphatic (hydroxo-) carboxylic acids. Combination of several spectroscopic techniques with factor analysis and quantum chemical calculations; Untersuchungen zur Struktur von wassergeloesten und an Haematit sorbierten Uran(VI)-Komplexen mit aliphatischen (Hydroxy-) Carbonsaeuren. Kombination verschiedener spektroskopischer Methoden mit Faktorenanalyse und quantenchemischen Berechnungen

    Energy Technology Data Exchange (ETDEWEB)

    Lucks, Christian

    2013-04-23

    This study is focussed on throwing light on the structures of uranium(VI) complexes with aliphatic (hydroxy-) carboxylic acids and on the structures of the sorption complexes on the iron mineral hematite in presence and absence of organic acids. The ternary system of hematite, uranium(VI), and organic ligand is very complicated, thus it is necessary to decompose it in binary systems. The results within these binary systems are used to better understand the complicated ternary system. Based on the comprehensive investigations on the aqueous uranium(VI) complexes, it is now possible to draw inferences from the structure of the carboxylic acid about the structure of the formed uranium(VI) complex in dependence of the pH. At first it has to be mentioned that uranium(VI) commonly gives pentagonal bipyramidal complexes. The pentaaquauranylion is formed by two axial oxygen atoms (O{sub ax}) at a distance of 1.76 Aa and five equatorial oxygen atoms (O{sub eq}) at 2.40 Aa stemming from coordinated water molecules. Due to complexation with organic ligands water is replaced by the ligand, thus the interatomic distances change. The results gained during all these investigations can help to better understand the interaction of uranium(VI) and carboxylic acids, and beyond that the sorption of uranium(VI) on hematite in the presence of carboxylic acids. Structures of the aqueous and sorption complexes are proposed. All these findings support the ongoing research on the transport behaviour of radioactive matter and may lead to more reliable risk assessment in connection with the permanent disposal of nuclear waste and the residues of uranium mining.

  14. Cranial mononeuropathy VI

    Science.gov (United States)

    ... may reduce the risk by controlling their blood sugar. Alternative Names Abducens paralysis; Abducens palsy; Lateral rectus palsy; Vith nerve palsy; Cranial nerve VI palsy Images Central nervous system and peripheral nervous system References Rucker JC. Cranial ...

  15. RCC-RMX appendix A16 methodology for the analytical J calculation under thermal and combined thermal plus mechanical loadings for pipes and elbows and related assessment tool MJSAM

    International Nuclear Information System (INIS)

    RCC-MRx code provides flaw assessment methodologies and related tools for Nuclear Power Plant cracked components. An important work has been made in particular to develop a large set of compendia for the calculation of the parameter J for various components (plates, pipes, elbows,...) and various defect geometries. Also, CEA in the frame of collaborations with IRSN, developed a methodology for J analytical calculation for cracked pipes and elbows submitted to thermal and combined mechanical and thermal loadings. This paper presents first the development of this methodology and an overview of the validation strategy, based on reference 2D and 3D F.E. calculations. The second part of the paper presents the last version of the MJSAM tools which is based on the 2010 version of the appendix A16 of the RCC-MRx code. All compendia (for KI, J and C* calculation) and all defect assessment procedures have been implemented in the tool: It covers crack initiation and propagation under fatigue, creep, creep-fatigue and ductile tearing situations. Sensitivity and probabilistic analyses can also been performed with this tool, directly linked to Microsoft Excel software for the results exploitation. (authors)

  16. Descriptions of reference LWR facilities for analysis of nuclear fuel cycles. Appendixes

    International Nuclear Information System (INIS)

    The appendixes present the calculations that were used to derive the release factors discussed for each fuel cycle facility in Volume I. Appendix A presents release factor calculations for a surface mine, underground mine, milling facility, conversion facility, diffusion enrichment facility, fuel fabrication facility, PWR, BWR, and reprocessing facility. Appendix B contains additional release factors calculated for a BWR, PWR, and a reprocessing facility. Appendix C presents release factors for a UO2 fuel fabrication facility

  17. Appendix C

    DEFF Research Database (Denmark)

    Christensen, F. A.; Henriksen, M. S.; Brincker, Rune

    1999-01-01

    In this appendix a model is formulated for the rotational capacity of reinforced concrete beams assuming rebar tension failure. The model is based on a classical approach and establishes the load-deflection curve of a reinforced concrete beam. The rotational capacity is then obtained as the area ...

  18. Appendix A

    DEFF Research Database (Denmark)

    Henriksen, M. S.; Brincker, Rune; Heshe, Gert

    In this appendix a brief summary of experiments on reinforced concrete beams in three-point bending performed at Aalborg University is given. The aim of the investigation is to determine the full load-deflection curves for different beam sizes, different types of concrete and different amounts and...

  19. Appendix B

    DEFF Research Database (Denmark)

    Christensen, F. A.; Brincker, Rune

    1999-01-01

    In this appendix the failure behaviour of lightly reinforced concrete beams is investigated. A numerical model based on the fictitious crack approach according to Hillerborg [1] is established in order to estimate the load-deflection curve for lightly reinforced concrete beams. The debonding betw...

  20. New generation ion-imprinted nanocarrier for removal of Cr(VI) from wastewater

    Energy Technology Data Exchange (ETDEWEB)

    Uygun, Murat, E-mail: muygun@adu.edu.tr [Adnan Menderes University, Kocarl Latin-Small-Letter-Dotless-I Vocational and Training School (Turkey); Feyzioglu, Esra; Oezcal Latin-Small-Letter-Dotless-I skan, Emir; Caka, Mueserref; Ergen, Aygen; Akgoel, Sinan [Ege University, Department of Biochemistry, Faculty of Science (Turkey); Denizli, Adil [Hacettepe University, Department of Chemistry, Faculty of Science (Turkey)

    2013-08-15

    The purpose of this study was to prepare a novel ion-imprinted nanoparticle to remove Cr(VI) ions from waste water. For this, Cr(VI) ions were complexed with 2-methacryloylamido histidine (MAH) and then Cr(VI)-imprinted poly(HEMAH) nanoparticles were synthesized by surfactant-free emulsion polymerization technique. The templates, Cr(VI) ions, were removed from the nanoparticles using 0.1 M of HNO{sub 3} solution. The specific surface area of the Cr(VI)-imprinted poly(HEMAH) nanoparticles was found to be 1,397.85 m{sup 2}/g, and the particle size was calculated as 155.3 nm. These Cr(VI)-imprinted nanoparticles were used for the adsorption/desorption of Cr(VI) ions from its aqueous solutions. The effects of initial Cr(VI) concentration and medium pH on the Cr(VI) adsorption capacity were also studied. The maximum adsorbed amount of Cr(VI) on the imprinted nanoparticles was found to be 3,830.58 mg/g nanoparticle in pH 4.0. In order to investigate the selectivity of the imprinted nanoparticle, adsorption studies were repeated using Cr(III) ions. The selectivity results demonstrated that Cr(VI)-imprinted poly(HEMAH) nanoparticles showed high affinity for the Cr(VI) ions than Cr(III). The Cr(VI)-imprinted nanoparticles were used several times without decreasing their Cr(VI) adsorption capacities.

  1. Skal vi danse apokalypso?

    DEFF Research Database (Denmark)

    Hansen, Kim Toft

    2009-01-01

    Den danske forfatter Lene Andersen satte sig for år tilbage for at sætte verden stævne. Det er siden blevet til storværket Baade Og, der nu tager de sidste skridt hen mod sin afslutning. Værket er skrevet under pseudonymet Jesper Knallhatt, og det næstsidste bind Torsdag er netop udkommet. De før...... formaningerne, ender nytestamentelige dommedagsprofetier med at gå i opfyldelse. Skal vi danse apokalypso, eller skal vi rent faktisk tage de verdslige problemer seriøst op til overvejelse?...

  2. Electron-Ion Recombination Rate Coefficients and Photoionization Cross Sections for Astrophysically Abundant Elements. VII. Relativistic calculations for O VI and O VII for UV and X-ray modeling

    CERN Document Server

    Nahar, S N; Nahar, Sultana N.; Pradhan, Anil K.

    2003-01-01

    Aimed at ionization balance and spectral analysis of UV and X-ray sources, we present self-consistent sets of photoionization cross sections, recombination cross sections, and rate coefficients for Li-like O VI and He-like O VII. Relativistic fine structure is considered through the Breit-Pauli R-matrix (BPRM) method in the close coupling approximation, implementing the unified treatment for total electron-ion recombination subsuming both radiative and di-electronic recombination processes. Self-consistency is ensured by using an identical wavefunction expansion for the inverse processes of photoionization and photo-recombination. Radiation damping of resonances, important for H-like and He-like core ions, is included. Compared to previous LS coupling results without radiative decay of low-n (<= 10) resonances, the presents results show significant reduction in O VI recombination rates at high temperatures. In addition to the total rates, level-specific photoionization cross sections and recombination rate...

  3. Electron-Ion Recombination Rate Coefficients and Photoionization Cross Sections for Astrophysically Abundant Elements. VII. Relativistic calculations for O VI and O VII for UV and X-ray modeling

    OpenAIRE

    Nahar, Sultana N.; Pradhan, Anil K.

    2003-01-01

    Aimed at ionization balance and spectral analysis of UV and X-ray sources, we present self-consistent sets of photoionization cross sections, recombination cross sections, and rate coefficients for Li-like O VI and He-like O VII. Relativistic fine structure is considered through the Breit-Pauli R-matrix (BPRM) method in the close coupling approximation, implementing the unified treatment for total electron-ion recombination subsuming both radiative and di-electronic recombination processes. S...

  4. Genetics Home Reference: mucopolysaccharidosis type VI

    Science.gov (United States)

    ... Understand Genetics Home Health Conditions mucopolysaccharidosis type VI mucopolysaccharidosis type VI Enable Javascript to view the expand/ ... boxes. Print All Open All Close All Description Mucopolysaccharidosis type VI (MPS VI), also known as Maroteaux- ...

  5. 12 CFR Appendix G to Part 225 - Capital Adequacy Guidelines for Bank Holding Companies: Internal-Ratings-Based and Advanced...

    Science.gov (United States)

    2010-01-01

    ... company that uses 12 CFR part 225, appendix G, to calculate its risk-based capital requirements. (2) Any... (FFIEC) 009 Country Exposure Report); (iii) Is a subsidiary of a depository institution that uses 12 CFR part 3, appendix C, 12 CFR part 208, appendix F, 12 CFR part 325, appendix D, or 12 CFR part...

  6. u vi parolas Esperante?

    Institute of Scientific and Technical Information of China (English)

    Andrzej; Pettyn

    1999-01-01

    LA DEKTRIA LECIONOMi preferas bonan glaciaonBarbara kaj Danuta faris aetojnkaj nun ili estas en kafejo kaj interparo-las.—Danuta:Kion vi trinkos, Banjo?—Barbara:Mi ankoraǚ ne scias. Sedmi tre soifas kaj ankaǚ malsatas.—D:Mi ankaǚ devas ion mani. Sed itie en la menuo ne estas manajoj...

  7. II-VI semiconductor compounds

    CERN Document Server

    1993-01-01

    For condensed matter physicists and electronic engineers, this volume deals with aspects of II-VI semiconductor compounds. Areas covered include devices and applications of II-VI compounds; Co-based II-IV semi-magnetic semiconductors; and electronic structure of strained II-VI superlattices.

  8. 47 CFR Appendix - Technical Appendix 2

    Science.gov (United States)

    2010-10-01

    ... 47 Telecommunication 5 2010-10-01 2010-10-01 false Technical Appendix 2 Telecommunication NATIONAL TELECOMMUNICATIONS AND INFORMATION ADMINISTRATION, DEPARTMENT OF COMMERCE DIGITAL-TO-ANALOG CONVERTER BOX COUPON PROGRAM Waiver of household eligibility. Pt. 301, App. 2 Technical Appendix 2 TECHNICAL APPENDIX...

  9. The chemistry of uranium (VI), neptunium (VI), and plutonium (VI) in aqueous carbonate solutions

    International Nuclear Information System (INIS)

    The dynamic behavior of carbonate ion as a ligand that interacts with the hexavalent actinyl ions of U, Np, and Pu was examined by 13C NMR spectroscopy. The first-order rate parameter, k, that describes the exchange between bulk solution and bound carbonate decreases with increasing pH. At a pH of 10.0, and 25 degrees C, the respective values of k for the U(VI), Np(VI) complexes are 27.1 ± 0.3, 64.7 ± 3.3, and 706 ± 29. The variation of k with temperature was used to calculate the values of activation enthalpy ΔH double-dagger = 53 and 42 kJ mol-1; and activation entropy ΔS double-dagger = - 40 and - 71 J mol-1 K-1 for the uranyl and neptunyl systems, respectively. In this paper a plausible reaction scheme for the exchange reaction is considered. The influence of these slow carbonate-exchange reactions on selected electron-transfer reactions is noted

  10. Uranium(VI) uptake by synthetic calcium silicate hydrates

    International Nuclear Information System (INIS)

    The immobilization of U(VI) by C-S-H phases under conditions relevant for the cementitious near field of a repository for radioactive waste has been investigated. C-S-H phases have been synthesized using two different procedures: the 'direct reaction' method and the 'solution reaction' method. The stabilities of alkaline solutions of U(VI) (presence of precipitates or colloidal material) were studied prior to sorption and co-precipitation tests in order to determine the experimental U(VI) solubility limits. These U(VI) solubility limits were compared with the U(VI) solubilities obtained from thermodynamic speciation calculations assuming the presence of combinations of different solid U(VI) phases. The solid phase controlling U(VI) solubility in the present experiments was found to be CaUO4s). The U(VI) uptake kinetics and sorption isotherms on C-S-H phases with different C:S ratios were determined under various chemical conditions; e.g., sorption and co-precipitation experiments and different pH's. U(VI) was found to sorb fast and very strongly on C-S-H phases with distribution ratios (Rd values) ranging in value between 103 L kg-1 and 106 L kg-1. Both sorption and co-precipitation experiments resulted in Rd values which were very similar, thus indicating that no additional sorption sites for U(VI) were generated in the co-precipitation process. Furthermore, C-S-H synthesis procedures did not have a significant influence on U(VI) uptake. The U(VI) sorption isotherms were found to be non-linear, and further, increasing Ca concentrations resulted in increasing U(VI) uptake. The latter observation suggests that U(VI) uptake is controlled by a solubility-limiting process, while the former observation further indicates that pure Ca-uranate is not the solubility-limiting phase. It is proposed that a solid solution containing Ca and UO22+ could control U(VI) uptake by C-S-H phases. (authors)

  11. Remedial Action Plan and Site Design for stabilization of the inactive Uranium Mill Tailings sites at Slick Rock, Colorado: Appendix C to Attachment 3, Calculations. Final

    International Nuclear Information System (INIS)

    This volume contains calculations for: Slick Rock processing sites background ground water quality; Slick Rock processing sites lysimeter water quality; Slick Rock processing sites on-site and downgradient ground water quality; Slick Rock disposal site background water quality; Burro Canyon disposal site, Slick Rock, Colorado, average hydraulic gradients and average liner ground water velocities in the upper, middle, and lower sandstone units of the Burro Canyon formation; Slick Rock--Burro Canyon disposal site, Burro Canyon pumping and slug tests--analyses; water balance and surface contours--Burro Canyon disposal cell; and analytical calculation of drawdown in a hypothetical well completed in the upper sandstone unit of the Burro Canyon formation

  12. Remedial Action Plan and Site Design for stabilization of the inactive Uranium Mill Tailings sites at Slick Rock, Colorado: Appendix C to Attachment 3, Calculations. Final

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1995-09-01

    This volume contains calculations for: Slick Rock processing sites background ground water quality; Slick Rock processing sites lysimeter water quality; Slick Rock processing sites on-site and downgradient ground water quality; Slick Rock disposal site background water quality; Burro Canyon disposal site, Slick Rock, Colorado, average hydraulic gradients and average liner ground water velocities in the upper, middle, and lower sandstone units of the Burro Canyon formation; Slick Rock--Burro Canyon disposal site, Burro Canyon pumping and slug tests--analyses; water balance and surface contours--Burro Canyon disposal cell; and analytical calculation of drawdown in a hypothetical well completed in the upper sandstone unit of the Burro Canyon formation.

  13. u vi parolas Esperante?

    Institute of Scientific and Technical Information of China (English)

    Abdrzej; Pettyn

    2000-01-01

    LA DEKSESA LECIONO Oni povas ci tie bone babili Ni trovigas en la restoracio "Fabelo", kie okazas nun la naskigtaga festeno de Petro. —Danuta: "Fabelo" estas tre agrabla. —K: Jes, oni povas ci tie bone mangi kaj ankau bone babili, car la orkestro ne estas tro brua. —D: Ec la plej bona orkestro Renas, kiam gi estas tro brua. —K: Vi pravas. Rigardu, tie en la an

  14. Intelsat VI antenna system

    Science.gov (United States)

    Caulfield, M. F.; Lane, S. O.; Taormina, F. A.

    The antenna system design of a series of five new communications satellites known as Intelsat VI is described in detail. Each satellite will utilize 50 transponders operating in the C and K band portions of the frequency spectrum. The transponders are interconnectible using either static switch matrices or a network which provides satellite switched time division multiple access capability. The antenna coverages, characteristics, and special design features are shown and discussed.

  15. The influence of an energy groups number and mesh size on results of reactivity coefficients calculations for BN-600 benchmark core. Appendix 1

    International Nuclear Information System (INIS)

    This document presents the OKBM contribution to the analysis of a benchmark of BN-600 reactor hybrid core with simultaneous loading of uranium fuel and MOX fuel within the framework of the international IAEA Co-ordinated Research Project (CRP) on 'Updated Codes and Methods to Reduce the Calculational Uncertainties of the LMFR Reactivity Effects'. The purpose of the present document is the comparison of some obtained for the Phase 2 results using the different energy groups number and the different mesh point size. The CRP participants at calculation of a benchmark used different planar mesh point sizes. The axial mesh point size was not stipulated, but the mesh sizes were specified for the desired results representation. Therefore in some cases there was possible the application of rather large axial mesh size. The discrepancy in results because the different mesh point size using should be estimated. The results of some participants were obtained using the relatively small energy groups number - 6, 9, and 12. The influence of the energy group number on value of the obtained reactivity coefficients is analyzed in case of the OKBM calculations results. Besides in case of the sodium density reactivity coefficient the OKBM used method of the choice for the few group optimal division of the energy scale is shown. The probable additional uncertainties as the consequence of the baseless group division are estimated by the comparison of the group division schemes applied by different CRP participants

  16. Remedial action plan and site design for stabilization of the inactive uranium processing site at Naturita, Colorado. Appendix A of Attachment 3: Calculations, Final

    Energy Technology Data Exchange (ETDEWEB)

    1994-03-01

    This report contains calculations for: hydraulic gradients for Alluvial Aquifer and Salt Wash Aquifer; slug test analysis to determine hydraulic conductivity for Alluvial Aquifer and Salt Wash Aquifer; average linear groundwater velocity for Alluvial Aquifer and Salt Wash Aquifer; statistical analysis of the extent of existing groundwater contamination; hydraulic gradients for Dakota/Burro Canyon Formation and Salt Wash Aquifer; slug test analysis to determine hydraulic conductivity for Dakota/Burro Canyon Formation and Perched Salt Wash Aquifer; determination of hydraulic conductivity of the Dakota/Burro Canyon Formation from Packer Tests; average linear groundwater velocity for Dakota/Burro Canyon and Salt Wash Aquifer; chemical and mineralogical characterization of core samples from the Dry Flats Disposal Site; and demonstration of low groundwater yield from Uppermost Aquifer.

  17. Vi lever i en verden af ting

    DEFF Research Database (Denmark)

    Helms, Niels Henrik

    2009-01-01

    Vi lever i en verden af ting Vi lever i en verden af ting. Menneskeligt frembragte påvirkninger, konstruktioner og manipulationer af vores natur, hvis det da er vores natur. Vi lever også i et særligt innovations-regime, hvor vi bliver vurderet på og defineret af, hvad og hvordan vi kan bidrage med...

  18. Adsorption Properties of Chromium (VI by Chitosan Coated Montmorillonite

    Directory of Open Access Journals (Sweden)

    Dahe Fan

    2006-01-01

    Full Text Available The adsorption of chromium (VI by Chitosan Coated Montmorillonite (CCM from aqueous solution was studied. To evaluate the adsorption capacity, the effects of pH, initial concentration and temperature on the adsorption were investigated. The isothermal data was applied to Langmuir linear and the Freundlich linear isotherm equation and the thermodynamic parameters (ΔH, ΔG, ΔS were calculated according to the values of binding Langmuir constant, KL. Results indicated that the adsorption between CCM and chromium (VI was significantly physical, the negative ΔH constant at lower temperature confirmed that the more chromium (VI was adsorbed by chitosan coated montmorillonite at lower temperature. The kinetics of the sorption process of chromium (VI on chitosan coated montmorillonite were investigated using the pseudo-first order and pseudo-second order kinetics, results showed that the pseudo-second order equation model provided the best correlation with the experimental results.

  19. Exposition concerning small windmills. Appendix to main report. Volume 1

    International Nuclear Information System (INIS)

    This appendix to the main report entitled ''Exposition Concerning Small Windmills'' includes background information on the report, profiles of the participating companies and of those visited in Denmark and abroad, questionnaires and interview schemes sent to the participating companies, surveys of producers of Danish and foreign producers of small windmills and an appendix to the economical calculations found within the report. (AB)

  20. ViPAR

    DEFF Research Database (Denmark)

    Carter, Kim W; Francis, Richard W; Bresnahan, M; Gissler, M; Grønborg, T K; Gross, R; Gunnes, N; Hammond, G; Hornig, M; Hultman, C M; Huttunen, J; Langridge, A; Leonard, H; Newman, S; Parner, E T; Petersson, G; Reichenberg, A; Sandin, S; Schendel, Diana; Schalkwyk, L; Sourander, A; Steadman, C; Stoltenberg, C; Suominen, A; Surén, P; Susser, E; Sylvester Vethanayagam, A; Yusof, Z

    2015-01-01

    free and open source methods to provide researchers with a web-based platform to analyse datasets housed in disparate locations. METHODS: Database federation permits controlled access to remotely located datasets from a central location. The Secure Shell protocol allows data to be securely exchanged......PAR infrastructure, remote sites manage their own harmonized research dataset in a database hosted at their site, while a central server hosts the data federation component and a secure analysis portal. When an analysis is initiated, requested data are retrieved from each remote site and virtually pooled at the...... central site. The data are then analysed by statistical software and, on completion, results of the analysis are returned to the user and the virtually pooled data are removed from memory. CONCLUSIONS: ViPAR is a secure, flexible and powerful analysis platform built on open source technology that is...

  1. 22 CFR Appendix A to Part 141 - Federal Financial Assistance to Which This Part Applies

    Science.gov (United States)

    2010-04-01

    ... Applies A Appendix A to Part 141 Foreign Relations DEPARTMENT OF STATE CIVIL RIGHTS NONDISCRIMINATION IN FEDERALLY-ASSISTED PROGRAMS OF THE DEPARTMENT OF STATE-EFFECTUATION OF TITLE VI OF THE CIVIL RIGHTS ACT OF.... Mutual understanding between people of the United States and the people of other countries by...

  2. ViFiLite Project

    Data.gov (United States)

    National Aeronautics and Space Administration — ViFiLite is a wireless infrastructure that utilizes the advantages of a V-band technology in supporting data gathering for structural health monitoring as well as...

  3. Electrical installation calculations

    CERN Document Server

    Watkins, AJ

    2006-01-01

    Designed to provide a step by step guide to successful application of the electrical installation calculations required in day to day electrical engineering practice, the Electrical Installation Calculations series has proved an invaluable reference for over forty years, for both apprentices and professional electrical installation engineers alike.Now in its seventh edition, Volume 1 has been fully updated to meet the requirements of the 2330 Level 2 Certificate in Electrotechnical Technology from City & Guilds, and will also prove a vi

  4. Contribution to the study of the redox couple Np(VI)/Np(V) in the presence of uranium(VI) in solutions of nitric acid and nitrous acid

    International Nuclear Information System (INIS)

    The redox behavior of the Np(VI)/Np(V) couple was the subject of a spectrometric study of the Np(VI) reduction reaction in nitric acid solutions (4 to 5 M) containing variable concentrations (1.5 to 3.5 x 10-3 M) of nitrous acid. A low nitrous acid concentration and a high nitric acid concentration were found to favor the stabilization of Np(VI). The stoichiometric coefficients of nitrous acid and nitric acid in the Np(VI) reduction reaction were determined thermodynamically, although only the reaction order with respect to HNO2 could be calculated from a kinetic analysis. Adding nitrate ions to a HNO3/HNO2 solution enhanced the stability of neptunium at oxidation state +VI, but also increased the reduction rate. When uranium(VI) was added to the HNO3/HNO2 solutions, the total quantity of neptunium at oxidation state +V (either free or as a Np(V)-U(VI) complex) remained practically unchanged, as did the Np(VI) reduction rate. The electrochemical behavior of the Np(VI)/Np(V) couple was investigated in a weak acidic medium by voltammetry with an ultra-micro-electrode (UME). The oxidation wave limiting current variation was a linear function of the Np(V) concentration when a gold UME was used, but not with a platinum UME; the reduction wave limiting current variation versus the Np(V) concentration was linear with either gold or platinum UMEs. The presence of the Np(V)-U(VI) complex in the neptunium solutions was characterized by a shift in the normal apparent potential of the Np(VI)/Np(V) couple toward anodic potentials consistent with the previously determined values of the complexation constants. (author)

  5. Superconductivity of calcium in phase VI

    Energy Technology Data Exchange (ETDEWEB)

    Szczesniak, R. [Institute of Physics, Czestochowa University of Technology, Al. Armii Krajowej 19, 42-200 Czestochowa (Poland); Durajski, A.P., E-mail: adurajski@wip.pcz.pl [Institute of Physics, Czestochowa University of Technology, Al. Armii Krajowej 19, 42-200 Czestochowa (Poland)

    2012-01-15

    Thermodynamic parameters of the superconducting state that induces in calcium in phase VI. The high critical temperature and Coulomb pseudopotential. The non BCS value of the ratio 2{Delta}/k{sub B}T{sub C}. The large electron effective mass. The properties of the superconducting state of calcium in phase VI were analyzed. By using the imaginary axis Eliashberg equations it has been shown, that the Coulomb pseudopotential reaches the high value equal to 0.215. In the considered case, the critical temperature is not properly described by the Allen-Dynes formula and it should be calculated with an use of the modified expression. In the paper the exact solutions of the Eliashberg equations on the real axis were also obtained. On this basis it was stated, that the effective potential of the electron-electron interaction is attractive for the frequencies lower or equal to the maximum phonon frequency. Then, the dimensionless parameter 2{Delta}(0)/k{sub B}T{sub C} = 4.10 was calculated. In the last step it has been proven, that the ratio of the electron effective mass to the bare electron mass is high and reaches its maximum equal to 2.36 for the critical temperature.

  6. Remedial action plan and site design for stabilization of the Inactive Uranium Mill Tailings Site, Maybell, Colorado. Final report, Appendixes to attachment 3

    International Nuclear Information System (INIS)

    This document contains supporting appendices to attachment 3 for the remedial action and site stabilization plan for Maybell, Colorado UMTRA site. Appendix A includes the Hydrological Services Calculations and Appendix B contains Ground Water Quality by Location data

  7. Synergistic extraction of uranium (VI), thorium (IV) and cerium (III) by thenoyltri-fluoroacetone and phenanthroline

    International Nuclear Information System (INIS)

    The synergistic extraction of uranium(VI), thorium(IV) and cerium(III) with thenoyltrifluoroacetone (HTTA) and phenanthroline (phen) is studied. The extraction equilibrium constants are calculated and the mechanism of the synergistic extraction has been discussed

  8. The effect of Paecilomyces catenlannulatus on removal of U(VI) by illite

    International Nuclear Information System (INIS)

    The effect of Paecilomyces catenlannulatus (P. catenlannulatus) on removal of U(VI) onto illite as a function of contact time, pH, ionic strength, and solution concentration was conducted by batch techniques. The adsorption kinetics indicated that the removal of U(VI) on illite and illite coated P. catenlannulatus can be fitted by pseudo-second order kinetic model very well. The removal of U(VI) on illite and illite coated P. catenlannulatus increased with increasing pH from 1.0 to 7.0, whereas the decrease of U(VI) adsorption on illite and illite coated P. catenlannulatus was observed at pH > 7.5. The adsorption behavior of U(VI) on illite and illite coated P. catenlannulatus can be simulated by the double diffuse model under various pH conditions. The ionic strength-dependent experiments showed that the removal of U(VI) on illite was outer-sphere surface complexation, whereas the inner-sphere surface complexation predominated the U(VI) adsorption onto illite coated P. catenlannulatus at pH 5.0–7.0. The maximum adsorption capacity of U(VI) on illite and illite coated P. catenlannulatus calculated from Langmuir model at pH 5.0 and T = 298 K was 46.729 and 54.347 mg/g, respectively, revealing enhanced adsorption of U(VI) on illite coated P. catenlannulatus. This paper highlights the effect of microorganism on the removal of radionuclides from aqueous solutions in environmental pollution management. - Highlights: • The removal of U(VI) by illite is strongly influenced by Paecilomyces catenlannulatus. • The removal of U(VI) by illite is an exothermic and spontaneous process. • The removal of U(VI) can be simulated by double diffuse model

  9. Salivary carbonic anhydrase isoenzyme VI

    Science.gov (United States)

    Kivelä, Jyrki; Parkkila, Seppo; Parkkila, Anna-Kaisa; Leinonen, Jukka; Rajaniemi, Hannu

    1999-01-01

    The carbonic anhydrases (CAs) participate in the maintenance of pH homeostasis in various tissues and biological fluids of the human body by catalysing the reversible reaction CO2+ H2O ⇌ HCO3−+ H+ (Davenport & Fisher, 1938; Davenport, 1939; Maren, 1967). Carbonic anhydrase isoenzyme VI (CA VI) is the only secretory isoenzyme of the mammalian CA gene family. It is exclusively expressed in the serous acinar cells of the parotid and submandibular glands, from where it is secreted into the saliva. In this review, we will discuss recent advances in research focused on the physiological role of salivary CA VI in the oral cavity and upper alimentary canal. PMID:10523402

  10. Chromium (VI) adsorption on boehmite

    Energy Technology Data Exchange (ETDEWEB)

    Granados-Correa, F. [Instituto Nacional de Investigaciones Nucleares, Apartado Postal 18-1027 Col., Escandon, Delegacion Miguel Hidalgo, C.P. 11801 Mexico, D.F. (Mexico)], E-mail: fgc@nuclear.inin.mx; Jimenez-Becerril, J. [Instituto Nacional de Investigaciones Nucleares, Apartado Postal 18-1027 Col., Escandon, Delegacion Miguel Hidalgo, C.P. 11801 Mexico, D.F. (Mexico)

    2009-03-15

    Boehmite was synthesized and characterized in order to study the adsorption behavior and the removal of Cr(VI) ions from aqueous solutions as a function of contact time, initial pH solution, amount of adsorbent and initial metal ion concentration, using batch technique. Adsorption data of Cr(VI) on the boehmite were analyzed according to Freundlich, Langmuir and Dubinin-Radushkevich (D-R) adsorption models. Thermodynamic parameters for the adsorption system were determinated at 293, 303, 313 and 323 K temperatures. The kinetic values and thermodynamic parameters from the adsorption process show that the Cr(VI) ions adsorption on boehmite is an endothermic and spontaneous process. These results show that the boehmite could be considered as a potential adsorbent for chromium ions in aqueous solutions.

  11. VI Tallinna arhitektuuritriennaal / Leonhard Lapin

    Index Scriptorium Estoniae

    Lapin, Leonhard, 1947-

    2005-01-01

    15.-17. IX Tallinnas Niguliste kirikus toimuval VI Tallinna arhitektuuritriennaalil esinevad inglise arhitektuurikriitik Peter Davey, šveitsi arhitekt Peter Zumthor, soome arhitekt Juha Leviskä, eesti arhitekt Vilen Künnapu, eesti kunstiajaloolane Juhan Maiste jt. Külastatakse KUMU, tutvutab autor Pekka Vapaavuori

  12. Bliver vi aldrig mætte?

    DEFF Research Database (Denmark)

    Christensen, Toke Haunstrup

    Vi har de sidste 100 år oplevet en utrolig vækst i den materielle levestandard. Mobiltelefoner og IT er eksempler på dette. Men det høje forbrug sætter kloden under pres. Bliver vi aldrig ”mætte” af forbruget? Og har vi et ansvar som enkeltpersoner?...

  13. Protostars and Planets VI

    Science.gov (United States)

    Beuther, Henrik; Klessen, Ralf S.; Dullemond, Cornelis P.; Henning, Thomas

    star and planet formation. They are used by students to dive into new topics, and they are much valued by experienced researchers as a comprehensive overview of the field with all its interactions. We hope that you will enjoy reading (and learning from) this book as much as we do. The organization of the Protostars and Planets conference was carried out in close collaboration between the Max Planck Institute for Astronomy and the Center for Astronomy of the University Heidelberg, with generous support from the German Science Foundation. This volume is a product of effort and care by many people. First and foremost, we want to acknowledge the 250 contributing authors, as it is only due to their expertise and knowledge that such a comprehensive review compendium in all its depth and breadth is possible. The Protostars and Planets VI conference and this volume was a major undertaking, with support and contributions by many people and institutions. We like to thank the members of the Scientific Advisory Committee who selected the 38 teams and chapters out of more than 120 submitted proposals. Similarly, we are grateful to the reviewers, who provided valuable input and help to the chapter authors. The book would also not have been possible without the great support of Renée Dotson and other staff from USRA’s Lunar and Planetary Institute, who handled the detailed processing of all manuscripts and the production of the book, and of Allyson Carter and other staff from the University of Arizona Press. We are also grateful to Richard Binzel, the General Editor of the Space Science Series, for his constant support during the long process, from the original concept to this final product. Finally, we would like to express a very special thank you to the entire conference local organizing committee, and in particular, Carmen Cuevas and Natali Jurina, for their great commitment to the project and for a very fruitful and enjoyable collaboration.

  14. LABORATORY STUDY FOR THE REDUCTION OF CHROME (VI) TO CHROME (III) USING SODIUM METABISULFITE UNDER ACIDIC CONDITIONS

    International Nuclear Information System (INIS)

    This report describes the results from RPP-PLAN-32738, 'Test Plan for the Effluent Treatment Facility to Reduce Chrome(VI) to Chrome(I1I) in the Secondary Waste Stream', using sodium metabisulfite. Appendix A presents the report as submitted by the Center for Laboratory Sciences (CLS) to CH2M HILL Hanford Group, Inc. The CLS carried out the laboratory effort under Contract Number 21065, release Number 30. This report extracts the more pertinent aspects of the laboratory effort

  15. viDA Thereapeutics, Inc. Business Plan

    OpenAIRE

    Lee, Nancy; Lestou, Valia S

    2008-01-01

    viDA Therapeutics Inc. (herein called viDA), with headquarters in Vancouver, British Columbia, was incorporated in April of 2008. viDA is a new specialty biotechnology company focused on the discovery, development and commercialization of first-in-class drugs for the treatment of age-related degenerative processes, such as age related wrinkling and hair loss. viDA has chosen a distinct company strategy, focusing strongly on the development and marketing of specialty products. viDA bases its b...

  16. Critical experiment on FCA Assembly VI-1

    International Nuclear Information System (INIS)

    Mock-up experiment on prototype fast breeder reactor ''MONJU'' has been performed using Fast Critical Facility (FCA), in JAERI. The first partial physics mock-up system is named FCA Assembly VI-1, which is two zoned core system. The inner core of the Assembly is the test region simulating the composition of the outer core of ''MONJU'', and the outer core of the Assembly is the driver region loaded by enriched uranium fuel. The measurements of critical mass, bunching effect, reaction rate ratio at the core center, and the radial distributions of fission rate have been conducted. Preliminary calculational results agree well with the measured values other than the fission rate distribution at the blanket region. (author)

  17. Endometriosis of the Appendix

    OpenAIRE

    Al Oulaqi, Nasser S; Hefny, Ashraf F; Joshi, Sandyia; Salim, Khalid; Abu-Zidan, Fikri M

    2008-01-01

    Endometriosis is a well known cause of infertility. Endometriosis of the appendix is a very rare condition. To highlight this rare entity, we are reporting a case of a young lady who was admitted with recurrent attacks of lower abdominal pain associated with primary infertility. Preoperative diagnosis was acute appendicitis. Histopathological examination of the appendix revealed endometriosis. Endometriosis should be considered in the differential diagnosis of recurrent lower abdominal pain i...

  18. Evaluation of ENDF/B-VI library with WIMS-AECL/RFSP Code system

    International Nuclear Information System (INIS)

    The object of this research is the evaluation of the cross-section charicteristics of ENDF/B-VI WIMS-AECL library against ENDF/B-V library previously used in the validation of WIMS-AECL code. validation of WIMS-AECL code had been carried out through the Phase-B post simulation of Wolsong Units 2, 3 and 4 before. Discrepancies between the calculated and measured values were thought to be mainly from observation errors and partly from the ENDF/B-V library. Till now, there had been various validation calculations for ENDF/B-VI library in the field of PWR but not in CANDU-PHWR. We herein, evaluated the ENDF/B-VI WIMS-AECL library for Wolsong Unit 4 by comparing the results with previous ones of ENDF/B-V for the same reactor unit with same WIMS/RFSP code system. It can be summarized that the Phase-B post simulation results of WIMS/RFSP with ENDF/B-VI are better than those of ENDF/B-V, because of less difference between calculated and measured values. There must be further study with different core conditions, however, for the exact evaluation of ENDF/B-VI WIMS-AECL library including calculations of many other physical parameters and the treatment of isotopes which is not in ENDF/B-VI but in ENDF/B-V

  19. Synthesis, characterization and thermal behaviour of VO(IV), MoO2(VI) and UO2(VI) complexes of hexadentate tetraanionic ligand

    International Nuclear Information System (INIS)

    A new Schiff base ligand 2,4-dihydroxy-5-acetylacetophenone-2-aminothiophenol (H2L) was prepared by condensation of 2,4-dihydroxy-5-acetylacetophenone and 2-aminothiophenol in ethanol-DMF. The complexes of VO(IV), MoO2(VI) and UO2(VI) have been prepared and characterized by elemental analyses, magnetic moment, IR and electronic spectral data and thermogravimetric analysis (TGA). The IR spectral data reveal that the ligand behaves a tetraanionic hexadentate in nature. TGA and IR studies confirm the presence of coordinated water molecule in the complexes. The kinetic analysis of the TG data was performed by using the Coats-Redfern method and activation energy has been calculated. The complexes of MoO2(VI) and UO2(VI) are found to be octahedral while VO(IV) complex is square pyramidal geometry. (author)

  20. 4d photoabsorption in Te V and Te VI

    International Nuclear Information System (INIS)

    The 4d photoabsorption spectra of Cd I-like Te V and the Ag I-like Te VI have been recorded in the 70-102 eV region using the dual-laser plasma technique. Discrete structure due to 4d→6p,nf (4≤n≤8) transitions have been observed in both ion stages. These have been identified with the aid of Hartree-Fock calculations. (author). Letter-to-the-editor

  1. Chemistry of the Colloidal Group II-VI Nanocrystal Synthesis

    International Nuclear Information System (INIS)

    In the last two decades, the field of nanoscience and nanotechnology has witnessed tremendous advancement in the synthesis and application of group II-VI colloidal nanocrystals. The synthesis based on high temperature decomposition of organometallic precursors has become one of the most successful methods of making group II-VI colloidal nanocrystals. This method is first demonstrated by Bawendi and coworkers in 1993 to prepare cadmium chalcogenide colloidal quantum dots and later extended by others to prepare other group II-VI quantum dots as well as anisotropic shaped colloidal nanocrystals, such as nanorod and tetrapod. This dissertation focuses on the chemistry of this type of nanocrystal synthesis. The synthesis of group II-VI nanocrystals was studied by characterizing the molecular structures of the precursors and products and following their time evolution in the synthesis. Based on these results, a mechanism was proposed to account for the 2 reaction between the precursors that presumably produces monomer for the growth of nanocrystals. Theoretical study based on density functional theory calculations revealed the detailed free energy landscape of the precursor decomposition and monomer formation pathway. Based on the proposed reaction mechanism, a new synthetic method was designed that uses water as a novel reagent to control the diameter and the aspect ratio of CdSe and CdS nanorods

  2. 40 CFR Appendix G to Part 58 - Uniform Air Quality Index (AQI) and Daily Reporting

    Science.gov (United States)

    2010-07-01

    ... (SLAMS) or parts of the SLAMS required by 40 CFR 58.10 for each pollutant except PM. For PM, calculate... Daily Reporting G Appendix G to Part 58 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED) AMBIENT AIR QUALITY SURVEILLANCE Pt. 58, App. G Appendix G to Part...

  3. 12 CFR Appendix M1 to Part 226 - Generic Repayment Estimates

    Science.gov (United States)

    2010-01-01

    ... 12 Banks and Banking 3 2010-01-01 2010-01-01 false Generic Repayment Estimates M1 Appendix M1 to... Estimates Effective Date Note: At 74 FR 5441, Jan. 29, 2009, appendix M1 to part 226 was added, effective July 1, 2010. (a) Calculating generic repayment estimates. (1) Definitions. (i) “Retail credit...

  4. 10 CFR Appendix S to Part 50 - Earthquake Engineering Criteria for Nuclear Power Plants

    Science.gov (United States)

    2010-01-01

    ... criteria in Section VI of appendix A to 10 CFR part 100 continue to apply. Paragraphs IV.a.1.i, IV.a.1.ii... license, design approval, or manufacturing license is required by §§ 50.34(a)(12), 50.34(b)(10), or 10 CFR... final standard design for a nuclear power reactor of the type described in 10 CFR 50.22....

  5. Chromium (VI removal from aqueous solutions by purolite base anion-exchange resins with gel structure

    Directory of Open Access Journals (Sweden)

    Balan Catalin

    2013-01-01

    Full Text Available The removal of Cr (VI from aqueous solution using two strong base anionic resins with gel structure, Purolite A-400 (styrene-divinylbenzene matrix and Purolite A-850 (acrylic matrix was investigated in batch technique. The sorption efficiency was determined as a function of phases contact time, solution pH, resin dose, temperature and initial Cr (VI concentration. The percentage of Cr (VI removed reaches maximum values (up to 99 % in the pH range 4 - 5.3 under a resin dose of 6 g/L and of Cr (VI concentration up to 100 mg/L. An increase in temperature has a positive effect on the Cr (VI sorption process. The equilibrium sorption data were fitted with the Freundlich, Langmuir and Dubinin-Radushkevich isotherm models, using both linear and nonlinear regression method. The Langmuir model very well verifies the experimental data and gives the maximum sorption capacity of 120.55 mg Cr (VI/g and 95.82 mg Cr (VI/g for A-400 and A-850 resins, respectively. The thermodynamic study and mean free energy of sorption values calculated using Dubinin-Radushkevich equation indicated the sorption is a chemical endothermic process. The kinetic data were well described by pseudo-second order kinetic equation and the sorption process is controlled by external (film diffusion and intraparticle diffusion.

  6. Rare mycetes of Romania, VI

    Directory of Open Access Journals (Sweden)

    Denes PAZMANY

    1987-08-01

    Full Text Available The paper it's a new contribution to the knowledge of the Macromycetes growing in Romania. There are presented 52 species collected from Central Transylvania, mostly of them new for mycoflora of the whole country. The chorological code used for the localization (MTB is that presented by D. PAZMANY (1986. In the enumeration of the species the paper follows KREISEL's system from "Handbuch fur Pilzfreunde VI" (1975: the species are grouped in 2 classes and 6 orders, mostly of them belongs to the order Agaricales. Ecological, chorological and taxonomical problems are discussed.

  7. IRIS core criticality calculations

    International Nuclear Information System (INIS)

    Three-dimensional Monte Carlo computer code KENO-VI of CSAS26 sequence of SCALE-4.4 code system was applied for pin-by-pin calculations of the effective multiplication factor for the first cycle IRIS reactor core. The effective multiplication factors obtained by the above mentioned Monte Carlo calculations using 27-group ENDF/B-IV library and 238-group ENDF/B-V library have been compared with the effective multiplication factors achieved by HELIOS/NESTLE, CASMO/SIMULATE, and modified CORD-2 nodal calculations. The results of Monte Carlo calculations are found to be in good agreement with the results obtained by the nodal codes. The discrepancies in effective multiplication factor are typically within 1%. (author)

  8. Photon interaction data for ENDF/B-VI

    International Nuclear Information System (INIS)

    The ENDF/B-VI photon interaction library includes data for the elements hydrogen (Z=1) through fermium (Z=100) over the energy range 10 eV to 100 MeV. This library contains data to meet the needs of traditional photon transport methods. However, this library also contains data that can be used to perform much more detailed transport calculations. This paper describes the contents of this library and how it can be used for both traditional and more detailed transport calculations

  9. Kinetic-spectrophotometric determination of molybdenum(VI) and tungsten(VI) in mixtures

    International Nuclear Information System (INIS)

    A simple kinetic-spectrophotometric method is described for the determination of molybdenum(VI) and tungsten(VI) in mixtures, without prior separation. The method is based on the catalytic effect of molybdenum(VI) and tungsten(VI) on the 2,4-diaminophenol dihydrochloride (DAP) by hydrogen peroxide in acidic medium. The reaction was followed spectrophotometrically by measuring the rate of change in absorbance with time at 500 nm. A partial inhibition in the catalytic activity of each catalyst, when the other one is present, at all ratios of Mo(VI):W(VI) mixtures studied was observed. On the other hand, the catalytic activity of tungsten(VI) dropped to zero whilst that of molybdenum(VI) decreased slightly, in the presence of citrate ions. Two sets of experiments were carried out, the first in the absence and the other in the presence of citrate, and the resolution of Mo(VI)/W(VI) mixtures was achieved by solving two simultaneous equations. Various molar ratios of Mo(VI):W(VI), at the 10-6 M level, from 0.2:1 to 5:1 can be determined with satisfactory precision and accuracy. The selectivity of the method was investigated and the method was applied successfully to the determination of molybdenum and tungsten in each other's presence in steel. (authors)

  10. Pu(VI) hydrolysis: further evidence for a dimeric plutonyl hydroxide and contrasts with U(VI) chemistry.

    Science.gov (United States)

    Reilly, Sean D; Neu, Mary P

    2006-02-20

    A significant fraction of plutonium that is soluble in environmental waters and other aqueous solutions can be present as complexes of plutonyl, PuO2(2+). Few thermodynamic data are available for this ion, representing a problematic gap in plutonium chemistry and in the forecasting of radionuclide behavior under contamination and nuclear repository conditions. To address this need and more accurately determine the stoichiometry and stability of the basic hydrolytic products, we completed complimentary potentiometric and spectrophotometric studies of plutonium(VI) hydrolysis over the concentration range of 10(-2) to 10(-5) M Pu(VI). Dinuclear hydroxide species (PuO2)2(OH)2(2+) and (PuO2)2(OH)4(0)(aq) with hydrolysis constants log beta(2,2) = -7.79 +/- 0.20 and log beta(4,2) = -19.3 +/- 0.5 are indicated in all experiments of millimolar Pu(VI), 0.10 M NaNO3 solutions at 25 degrees C. At lower Pu(VI) concentrations, at and below 10(-4) M, the monomeric species PuO2OH+ and PuO2(OH)2(0)(aq) form with hydrolysis constants of log beta(1,1) = -5.76 +/- 0.07 and log beta(2,1) = -11.69 +/- 0.05, respectively. Distinct optical absorbance bands at 842 and 845 nm are reported for the mononuclear and dinuclear first hydrolysis species. Standard hydrolysis constants at zero ionic strength were calculated from the experimentally determined constants using the specific ion interaction theory. The Pu(VI) hydrolysis species and constants are compared with results from previous studies for plutonium and uranium. Major differences between uranyl and plutonyl hydrolysis are described. PMID:16472001

  11. Solubility of plutonium(VI) carbonate in saline solutions

    Science.gov (United States)

    Reilly, Sean D.; Runde, Wolfgang; Neu, Mary P.

    2007-06-01

    Among the plutonium oxidation states found to form in the environment, mobile plutonium(VI) can exist under oxidizing conditions and in waters with high chloride content due to radiolysis effects. We are investigating the solubility and speciation of plutonium(VI) carbonate under conditions relevant to natural waters and brines such as those found near some geologic radioactive waste repositories. The solid Pu(VI) phase PuO 2CO 3(s) was prepared and its solubility was measured in NaCl and NaClO 4 solutions in a CO 2 atmosphere as a function of pH and ionic strength (0.1-5.6 m). The concentration of soluble plutonium in solution was calculated from spectroscopic data and liquid scintillation counting. Spectroscopic measurements also revealed the plutonium oxidation state. The apparent solubility product of PuO 2CO 3(s) was determined at selected electrolyte concentrations to be, log Ks,0 = -13.95 ± 0.07 (0.1 m NaCl), log Ks,0 = -14.07 ± 0.13 (5.6 m NaCl), and log Ks,0 = -15.26 ± 0.11 (5.6 m NaClO 4). Specific ion interaction theory was used to calculate the solubility product at zero ionic strength, logKs,0∘=-14.82±0.05.

  12. Nanostructure, thermoelectric properties, and transport theory of V2VI3 and V2VI3/IV-VI based superlattices and nanomaterials

    International Nuclear Information System (INIS)

    The scope of this work is to review the thermoelectric properties, the microstructures, and their correlation with theoretical calculations and predictions for recent chalcogenide based materials. The main focus is put on thin multilayered Bi2Te3, Sb2Te3 films, and bulk V2VI3/IV-VI mixed systems. For all films a systematic characterization of the thermoelectric properties as well as the micro- and nanostructure was performed. The degree of crystallinity of the multilayered films varied from epitaxial systems to polycrystalline films. Other multilayered thin films revealed promising thermoelectric properties. (SnSe)1.2TiSe2 thin films with rotational disorder yielded the highest Seebeck coefficient published to date for analogous materials. For bulk V2VI3/IV-VI mixed systems insides are given into a complete ''material to module'' process resulting in a high performance thermoelectric generator using (1-x)(GeTe) x(Bi2Se0.2Te2.8) (x = 0.038). Cyclic heating of this system with x = 0.063 resulted in a drastic change of the micro- and nanostructure observed by ex situ and in situ X-ray diffraction (XRD) and transmission electron microscopy (TEM). Consequently a degradation of ZT at 450 C from ∝2.0 to ∝1.0 was observed, while samples with x = 0.038 showed a stable ZT of 1.5. (copyright 2016 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim)

  13. MCNP analysis of the Livermore pulsed spheres with ENDF/B-VI

    International Nuclear Information System (INIS)

    Twenty-five Livermore pulsed sphere experiments have been modeled with the MCNP4A code using ENDF/B-VI cross sections processed by the NJOY nuclear data processing system. These calculations have been compared to an earlier study using ENDF/B-V data using the MCNP4 code. These are the first MCNP4A benchmarks, the first ENDF/B-VI benchmarks with MCNP, and the first analysis of these NJOY-processed data. In general, these results validate the MCNP code, demonstrate that ENDF/B-VI and ENDF/B-V generally agree, and in some cases show that ENDF/B-VI gives better results than ENDF/B-V

  14. 18 CFR Appendix I to Subpart F of... - Procedures for Compliance With the Endangered Species Act of 1973 Under § 157.206(b)(3)(i)

    Science.gov (United States)

    2010-04-01

    ... CFR 402.02. The certificate holder shall be deemed in compliance with § 157.206(b)(2)(vi) of the... appropriate) as determined pursuant to 50 CFR 402.01 for the purpose of initiating informal consultations. 2... Compliance With the Endangered Species Act of 1973 Under § 157.206(b)(3)(i) I Appendix I to Subpart F...

  15. 49 CFR Appendix C to Part 21 - Application of Part 21 to Certain Federal Financial Assistance of the Department of Transportation

    Science.gov (United States)

    2010-10-01

    ... the Secretary of Transportation NONDISCRIMINATION IN FEDERALLY-ASSISTED PROGRAMS OF THE DEPARTMENT OF TRANSPORTATION-EFFECTUATION OF TITLE VI OF THE CIVIL RIGHTS ACT OF 1964 Pt. 21, App. C Appendix C to Part 21... retained for, or incidental to, construction, planning, research, highway safety, engineering,...

  16. 49 CFR Appendix A-I to Part 541 - Lines With Antitheft Devices Which Are Exempted From the Parts-Marking Requirements of This...

    Science.gov (United States)

    2010-10-01

    ... From the Parts-Marking Requirements of This Standard Pursuant to 49 CFR Part 543 A Appendix A-I to Part...-Marking Requirements of This Standard Pursuant to 49 CFR Part 543 Manufacturer Subject lines BMW MINI. X5.... Acura RL. Acura TL. Hyundai Azera. Genesis. VI.1 Isuzu Axiom. Jaguar XK. Kia Amanti. Mazda 2.1 3. 5....

  17. Genetics Home Reference: collagen VI-related myopathy

    Science.gov (United States)

    ... Genetics Home Health Conditions collagen VI-related myopathy collagen VI-related myopathy Enable Javascript to view the ... boxes. Print All Open All Close All Description Collagen VI-related myopathy is a group of disorders ...

  18. ■u vi parolas Esperante?

    Institute of Scientific and Technical Information of China (English)

    Andrzej; Pettyn

    2000-01-01

    LA DEKSEPA LECIONO Cu tio ci estas gripo? Barbara estas malsana kaj nun estas ce si kuracisto —Kuracisto: Bonan tagon! —Barbara: Bonan tagon! —Petro: Bonan tagon, sinjoro! —K: Vi efektive malbone aspektas, Kio estas al vi, sinjorino? —B: Mitre malbone fartas. Miaj kapo kaj gorgo doloras.

  19. Occupational exposure to chromium(VI compounds

    Directory of Open Access Journals (Sweden)

    Jolanta Skowroń

    2015-07-01

    Full Text Available This article discusses the effect of chromium(VI (Cr(VI on human health under conditions of acute and chronic exposure in the workplace. Chromium(VI compounds as carcinogens and/or mutagens pose a direct danger to people exposed to them. If carcinogens cannot be eliminated from the work and living environments, their exposure should be reduced to a minimum. In the European Union the proposed binding occupational exposure limit value (BOELV for chromium(VI of 0.025 mg/m³ is still associated with high cancer risk. Based on the Scientific Commitee of Occupational Exposure Limits (SCOEL document chromium(VI concentrations at 0.025 mg/m³ increases the risk of lung cancer in 2–14 cases per 1000 exposed workers. Exposure to chromium(VI compounds expressed in Cr(VI of 0.01 mg Cr(VI/m3 is responsible for the increased number of lung cancer cases in 1–6 per 1000 people employed in this condition for the whole period of professional activity. Med Pr 2015;66(3:407–427

  20. [Occupational exposure to chromium(VI) compounds].

    Science.gov (United States)

    Skowroń, Jolanta; Konieczko, Katarzyna

    2015-01-01

    This article discusses the effect of chromium(VI) (Cr(VI)) on human health under conditions of acute and chronic exposure in the workplace. Chromium(VI) compounds as carcinogens and/or mutagens pose a direct danger to people exposed to them. If carcinogens cannot be eliminated from the work and living environments, their exposure should be reduced to a minimum. In the European Union the proposed binding occupational exposure limit value (BOELV) for chromium(VI) of 0.025 mg/m³ is still associated with high cancer risk. Based on the Scientific Commitee of Occupational Exposure Limits (SCOEL) document chromium(VI) concentrations at 0.025 mg/m³ increases the risk of lung cancer in 2-14 cases per 1000 exposed workers. Exposure to chromium(VI) compounds expressed in Cr(VI) of 0.01 mg Cr(VI)/m3; is responsible for the increased number of lung cancer cases in 1-6 per 1000 people employed in this condition for the whole period of professional activity. PMID:26325053

  1. Når vi taler om 68

    DEFF Research Database (Denmark)

    Jensen, Henrik; Metz, Georg

    Når vi taler om 68 er en intellektuel samtale mellem to ligeværdige gentlemen og skallesmækkere. En essayistisk dyst om porno, RAF, Pittelkow og livsfilosofi......Når vi taler om 68 er en intellektuel samtale mellem to ligeværdige gentlemen og skallesmækkere. En essayistisk dyst om porno, RAF, Pittelkow og livsfilosofi...

  2. Appendix E: Geology

    Energy Technology Data Exchange (ETDEWEB)

    Reidel, Steve; Chamness, Mickie A.

    2008-01-17

    This appendix provides a detailed description of geology under the Central Plateau of the Hanford Site, emphasizing the areas around tank farms. It is to be published by client CH2M HILL Hanford Group, Inc., as part of a larger, multi-contractor technical report.

  3. Econophys-Kolkata VI Conference

    CERN Document Server

    Chakrabarti, Bikas; Chakraborti, Anirban; Ghosh, Asim

    2013-01-01

    The primary goal of the book is to present the ideas and research findings of active researchers such as physicists, economists, mathematicians and financial engineers working in the field of “Econophysics,” who have undertaken the task of modeling and analyzing systemic risk, network dynamics and other topics. Of primary interest in these studies is the aspect of systemic risk, which has long been identified as a potential scenario in which financial institutions trigger a dangerous contagion mechanism, spreading from the financial economy to the real economy. This type of risk, long confined to the monetary market, has spread considerably in the recent past, culminating in the subprime crisis of 2008. As such, understanding and controlling systemic risk has become an extremely important societal and economic challenge. The Econophys-Kolkata VI conference proceedings are dedicated to addressing a number of key issues involved. Several leading researchers in these fields report on their recent work and al...

  4. Contribution to the study of the redox couple Np(VI)/Np(V) in the presence of uranium(VI) in solutions of nitric acid and nitrous acid; Contribution a l'etude du comportement redox du couple Np(VI)/Np(V) en presence d'uranium VI dans les solutions constituees d'acide nitrique et d'acide nitreux

    Energy Technology Data Exchange (ETDEWEB)

    Arpigny, S. [CEA Marcoule, Dept. de Radiochimie et Procedes, DRP, 30 (France)

    2001-07-01

    The redox behavior of the Np(VI)/Np(V) couple was the subject of a spectrometric study of the Np(VI) reduction reaction in nitric acid solutions (4 to 5 M) containing variable concentrations (1.5 to 3.5 x 10{sup -3} M) of nitrous acid. A low nitrous acid concentration and a high nitric acid concentration were found to favor the stabilization of Np(VI). The stoichiometric coefficients of nitrous acid and nitric acid in the Np(VI) reduction reaction were determined thermodynamically, although only the reaction order with respect to HNO{sub 2} could be calculated from a kinetic analysis. Adding nitrate ions to a HNO{sub 3}/HNO{sub 2} solution enhanced the stability of neptunium at oxidation state +VI, but also increased the reduction rate. When uranium(VI) was added to the HNO{sub 3}/HNO{sub 2} solutions, the total quantity of neptunium at oxidation state +V (either free or as a Np(V)-U(VI) complex) remained practically unchanged, as did the Np(VI) reduction rate. The electrochemical behavior of the Np(VI)/Np(V) couple was investigated in a weak acidic medium by voltammetry with an ultra-micro-electrode (UME). The oxidation wave limiting current variation was a linear function of the Np(V) concentration when a gold UME was used, but not with a platinum UME; the reduction wave limiting current variation versus the Np(V) concentration was linear with either gold or platinum UMEs. The presence of the Np(V)-U(VI) complex in the neptunium solutions was characterized by a shift in the normal apparent potential of the Np(VI)/Np(V) couple toward anodic potentials consistent with the previously determined values of the complexation constants. (author)

  5. Anaerobic bio-removal of uranium (VI) and chromium (VI): Comparison of microbial community structure

    Energy Technology Data Exchange (ETDEWEB)

    Martins, Monica [Centro de Ciencias do Mar, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro (Portugal); Faleiro, Maria Leonor [IBB - Centro de Biomedicina Molecular e Estrutural, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro (Portugal); Chaves, Sandra; Tenreiro, Rogerio [Universidade de Lisboa, Faculdade de Ciencias, Centro de Biodiversidade, Genomica Integrativa e Funcional (BioFIG), Campus de FCUL, Campo Grande 1749-016 Lisboa (Portugal); Santos, Erika [Centro de Ciencias do Mar, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro (Portugal); Costa, Maria Clara, E-mail: mcorada@ualg.pt [Centro de Ciencias do Mar, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro (Portugal)

    2010-04-15

    Several microbial communities, obtained from uranium contaminated and non-contaminated samples, were investigated for their ability to remove uranium (VI) and the cultures capable for this removal were further assessed on their efficiency for chromium (VI) removal. The highest efficiency for removal of both metals was observed on a consortium from a non-contaminated soil collected in Monchique thermal place, which was capable to remove 91% of 22 mg L{sup -1} U(VI) and 99% of 13 mg L{sup -1} Cr(VI). This study revealed that uranium (VI) removing communities have also ability to remove chromium (VI), but when uranium (VI) was replaced by chromium (VI) several differences in the structure of all bacterial communities were observed. TGGE and phylogenetic analysis of 16S rRNA gene showed that the uranium (VI) removing bacterial consortia are mainly composed by members of Rhodocyclaceae family and Clostridium genus. On the other hand, bacteria from Enterobacteriaceae family were detected in the community with ability for chromium (VI) removal. The existence of members of Enterobacteriaceae and Rhodocyclaceae families never reported as chromium or uranium removing bacteria, respectively, is also a relevant finding, encouraging the exploitation of microorganisms with new abilities that can be useful for bioremediation.

  6. Anaerobic bio-removal of uranium (VI) and chromium (VI): Comparison of microbial community structure

    International Nuclear Information System (INIS)

    Several microbial communities, obtained from uranium contaminated and non-contaminated samples, were investigated for their ability to remove uranium (VI) and the cultures capable for this removal were further assessed on their efficiency for chromium (VI) removal. The highest efficiency for removal of both metals was observed on a consortium from a non-contaminated soil collected in Monchique thermal place, which was capable to remove 91% of 22 mg L-1 U(VI) and 99% of 13 mg L-1 Cr(VI). This study revealed that uranium (VI) removing communities have also ability to remove chromium (VI), but when uranium (VI) was replaced by chromium (VI) several differences in the structure of all bacterial communities were observed. TGGE and phylogenetic analysis of 16S rRNA gene showed that the uranium (VI) removing bacterial consortia are mainly composed by members of Rhodocyclaceae family and Clostridium genus. On the other hand, bacteria from Enterobacteriaceae family were detected in the community with ability for chromium (VI) removal. The existence of members of Enterobacteriaceae and Rhodocyclaceae families never reported as chromium or uranium removing bacteria, respectively, is also a relevant finding, encouraging the exploitation of microorganisms with new abilities that can be useful for bioremediation.

  7. Complex molybdates of U(VI) and Np(VI)

    International Nuclear Information System (INIS)

    Double molybdates of uranyl with monovalent cations are known - Na2UO2(MoO4)2.6H2O and K2UO2(MoO4)2 .4H2O, and also with divalent cations - M(UO2)3(MoO4)4 8H2O (M = Mg, Zn). It is established by spectrophotometrical method, that the degree of uranyl complexation in acidified water molybdate solutions is great. The solutions have strong luminescence and are metastable. After several days from them the bright yellow crystal product of composition: Na2UO2(MoO4)2.4H2O is isolated. With change of conditions, for example, temperature and ratio [Mo]:[H+] from acidified solutions of sodium molybdate only the complex of the specified composition is obtained. Neptunyl forms in water solutions of sodium molybdate 1-2M, probably, several complexes because the isobestic points in spectra of Np(VI) at various concentrations of molybdate are absent. From such solutions in time the dark - marsh crystals of composition: Na2NpO2(MoO4)2.4H2O are isolated. From acidified solutions of sodium molybdate the complexes of other structure are formed. With replacement of sodium by cesium the crystals Cs2NpO2(MoO4). 2H2O are formed. The behavior of uranyl and neptunyl differs also in solutions of ammonium paramolybdate: (NH4)2UO2(MoO4).2H2O and (NH4)2NpO2.(MoO4)2.2H2O are formed correspondingly. From sodium molybdate solutions at the presence of some organic solvents was isolated mixed-valent complex of composition: Na6[Np(V)O2]2[Np(VI)O2](MoO4)5.13H2O. The study of thermal and spectral behavior of the synthesized solid complexes also specifies the difference in properties of uranyl and neptunyl in investigated compounds and even in isostructural compounds

  8. 46 CFR Appendix A to Part 154 - Equivalent Stress

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 5 2010-10-01 2010-10-01 false Equivalent Stress A Appendix A to Part 154 Shipping...—Equivalent Stress I. Equivalent stress (σ c) is calculated by the following formula or another formula... normal stress in “x” direction. σy=total normal stress in “y” direction. τxy=total shear stress in...

  9. Cr(VI) retention and transport through Fe(III)-coated natural zeolite.

    Science.gov (United States)

    Du, Gaoxiang; Li, Zhaohui; Liao, Libing; Hanson, Renee; Leick, Samantha; Hoeppner, Nicole; Jiang, Wei-Teh

    2012-06-30

    Cr(VI) is a group A chemical based on the weight of evidence of carcinogenicity. Its transport and retention in soils and groundwater have been studied extensively. Zeolite is a major component in deposits originated from volcanic ash and tuff after alteration. In this study, zeolite aggregates with the particle size of 1.4-2.4mm were preloaded with Fe(III). The influence of present Fe(III) on Cr(VI) retention by and transport through zeolite was studied under batch and column experiments. The added Fe(III) resulted in an enhanced Cr(VI) retention by the zeolite with a capacity of 82mg/kg. The Cr(VI) adsorption on Fe(III)-zeolite followed a pseudo-second order kinetically and the Freundlich adsorption isotherm thermodynamically. Fitting the column experimental data to HYDRUS-1D resulted in a retardation factor of 3 in comparison to 5 calculated from batch tests at an initial Cr(VI) concentration of 3mg/L. The results from this study showed that enhanced adsorption and retention of Cr(VI) may happen in soils derived from volcanic ash and tuff that contains significant amounts of zeolite with extensive Fe(III) coating. PMID:22542779

  10. Learning the vi and Vim Editor

    CERN Document Server

    Robbins, Arnold; Hannah, Elbert

    2008-01-01

    There's nothing that hard-core Unix and Linux users are more fanatical about than their text editor. Editors are the subject of adoration and worship, or of scorn and ridicule, depending upon whether the topic of discussion is your editor or someone else's. vi has been the standard editor for close to 30 years. Popular on Unix and Linux, it has a growing following on Windows systems, too. Most experienced system administrators cite vi as their tool of choice. And since 1986, this book has been the guide for vi. However, Unix systems are not what they were 30 years ago, and neither is this

  11. Impact of the ENDF/B-VI Cross Section on the RPV Fluence Determination

    International Nuclear Information System (INIS)

    The calculations with the broad-group cross-section library Bugle-96, and atom displacement (dpa) cross sections for iron, both derived from ENDF/B-VI data, result in higher calculated fast neutron fluxes, better agreement of calculations with radiometric dosimeter measurements, and significantly slower dpa rate attenuation through pressure vessel walls relative to the results with their predecessors: the Sailor library and ASTM iron dpa cross sections

  12. Trigonal Cu2-II-Sn-VI4 (II = Ba, Sr and VI = S, Se) quaternary compounds for earth-abundant photovoltaics.

    Science.gov (United States)

    Hong, Feng; Lin, Wenjun; Meng, Weiwei; Yan, Yanfa

    2016-02-14

    We propose trigonal Cu2-II-Sn-VI4 (II = Ba, Sr and VI = S, Se) quaternary compounds for earth-abundant solar cell applications. Through density functional theory calculations, we show that these compounds exhibit similar electronic and optical properties to kesterite Cu2ZnSnS4 (CZTS): high optical absorption with band gaps suitable for efficient single-junction solar cell applications. However, the trigonal Cu2-II-Sn-VI4 compounds exhibit defect properties more suitable for photovoltaic applications than those of CZTS. In CZTS, the dominant defects are the deep acceptors, Cu substitutions on Zn sites, which cause non-radiative recombination and limit the open-circuit voltages of CZTS solar cells. On the contrary, the dominant defects in trigonal Cu2-II-Sn-VI4 are the shallow acceptors, Cu vacancies, similar to those in CuInSe2. Our results suggest that the trigonal Cu2-II-Sn-VI4 quaternary compounds could be promising candidates for efficient earth-abundant thin-film solar cell and photoeletrochemical water-splitting applications. PMID:26804024

  13. The Appendix on CT

    Energy Technology Data Exchange (ETDEWEB)

    Whitley, S. [Sunnybrook Health Sciences Center, Toronto, Ontario (Canada); Barts and the Royal London, Royal London Hospital, Whitechapel, London (United Kingdom)], E-mail: siobhanwhitley@yahoo.co.uk; Sookur, P.; McLean, A.; Power, N. [Barts and the Royal London, Royal London Hospital, Whitechapel, London (United Kingdom)

    2009-02-15

    Appendicitis can be a difficult clinical diagnosis to make. A negative appendicectomy rate of 20% has traditionally been accepted as the consequences of appendiceal perforation can be grave. Cross-sectional imaging is increasingly being employed in the investigation of adults with suspected appendicitis. This review will demonstrate the appearance of the normal appendix on computed tomography (CT) and its appearance in a range of inflammatory and neoplastic processes including appendicitis, Crohn's disease, infections, and benign and malignant tumour000.

  14. 17 CFR Appendix B to Part 4 - Adjustments for Additions and Withdrawals in the Computation of Rate of Return

    Science.gov (United States)

    2010-04-01

    ... Withdrawals in the Computation of Rate of Return B Appendix B to Part 4 Commodity and Securities Exchanges... Appendix B to Part 4—Adjustments for Additions and Withdrawals in the Computation of Rate of Return This... trading advisors may calculate the rate of return information required by Rules 4.25(a)(7)(i)(F) and...

  15. The ENDF/B-VI photon interaction library

    International Nuclear Information System (INIS)

    The ENDF/B-VI photon interaction library includes data to describe the interaction of photons with the elements Z = 1 to 100 over the energy range 10 eV to 100 MeV. This library has been designed to meet the traditional needs of users to model the interaction and transport of primary photons. However, this library contains additional information which used in a combination with our other data libraries can be used to perform much more detailed calculations, e.g., emission of secondary fluorescence photons. This paper describes both traditional and more detailed uses of this library

  16. Radiological findings in patients with mucopolysaccharidosis type VI; Manifestacoes radiologicas da mucopolissacaridose tipo VI

    Energy Technology Data Exchange (ETDEWEB)

    Turtelli, Celso Montenegro [Hospital Sao Domingos, Uberaba, MG (Brazil). Servico de Diagnostico por Imagem]. E-mail: celso@mednet.com.br

    2002-10-01

    The radiological findings in two siblings with mucopolysaccharidosis type VI (muco polysaccharide VI) are reported. Conventional radiographs of the skeleton and magnetic resonance imaging examination of the central nervous system were performed. Skeletal abnormalities in patients with mucopolysaccharidosis type VI have already well described by other authors and are generally similar to other mucopolysaccharides. Magnetic resonance imaging of the central nervous system may be helpful in the differential diagnosis, assessment of extension, and follow-up of these diseases. (author)

  17. 19 CFR Annex Vi to Part 351 - Countervailing Investigations Timeline

    Science.gov (United States)

    2010-04-01

    ... 19 Customs Duties 3 2010-04-01 2010-04-01 false Countervailing Investigations Timeline VI Annex VI to Part 351 Customs Duties INTERNATIONAL TRADE ADMINISTRATION, DEPARTMENT OF COMMERCE ANTIDUMPING AND COUNTERVAILING DUTIES Pt. 351, Annex VI Annex VI to Part 351—Countervailing Investigations Timeline ER19MY97.000...

  18. Extraction of U(VI) and Th(IV) in nitric acid medium with N,N,N',N'-tetrahexylsuccinylamide

    International Nuclear Information System (INIS)

    The extraction mechanisms of U(VI) and Th(IV) in nitric acid solutions with N,N,N',N'-tetrahexylsuccinylamide (THSA) were described. The effects of nitric acid concentration, THSA concentration and temperature on the distribution coefficients of U(VI) and Th(IV), and the back extraction behaviours of U(VI) and Th(IV) from organic phase were studied. The compositions of the complex are found to be UO2(NO3)2·THSA and Th(NO3)4·2THSA. The equilibrium constants and thermodynamical functions of the extraction reactions have been calculated

  19. ViSIT: Visitor Survey Information Tool

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — ViSIT is an interactive web tool created by USGS to visualize the data collected as part of the National Wildlife Refuge Visitor Survey. The national survey was...

  20. 40 CFR 1502.18 - Appendix.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 32 2010-07-01 2010-07-01 false Appendix. 1502.18 Section 1502.18 Protection of Environment COUNCIL ON ENVIRONMENTAL QUALITY ENVIRONMENTAL IMPACT STATEMENT § 1502.18 Appendix. If an agency prepares an appendix to an environmental impact statement the appendix shall:...

  1. SaVi: satellite constellation visualization

    CERN Document Server

    Wood, Lloyd

    2012-01-01

    SaVi, a program for visualizing satellite orbits, movement, and coverage, is maintained at the University of Surrey. This tool has been used for research in academic papers, and by industry companies designing and intending to deploy satellite constellations. It has also proven useful for demonstrating aspects of satellite constellations and their geometry, coverage and movement for educational and teaching purposes. SaVi is introduced and described briefly here.

  2. O VI IN THE LOCAL INTERSTELLAR MEDIUM

    International Nuclear Information System (INIS)

    We report the results of a search for O VI absorption in the spectra of 80 hot DA white dwarfs observed by the FUSE satellite. We have carried out a detailed analysis of the radial velocities of interstellar and (where present) stellar absorption lines for the entire sample of stars. In approximately 35% of cases (where photospheric material is detected), the velocity differences between the interstellar and photospheric components were beneath the resolution of the FUSE spectrographs. Therefore, in 65% of these stars the interstellar and photospheric contributions could be separated and the nature of the O VI component unambiguously determined. Furthermore, in other examples, where the spectra were of a high signal-to-noise, no photospheric material was found and any O VI detected was assumed to be interstellar. Building on the earlier work of Oegerle et al. and Savage and Lehner, we have increased the number of detections of interstellar O VI and, for the first time, compared their locations with both the soft X-ray background emission and new detailed maps of the distribution of neutral gas within the local interstellar medium. We find no strong evidence to support a spatial correlation between O VI and SXRB emission. In all but a few cases, the interstellar O VI was located at or beyond the boundaries of the local cavity. Hence, any T ∼ 300,000 K gas responsible for the O VI absorption may reside at the interface between the cavity and surrounding medium or in that medium itself. Consequently, it appears that there is much less O VI-bearing gas than previously stated within the inner rarefied regions of the local interstellar cavity.

  3. The Chernobyl accident. Appendix B

    International Nuclear Information System (INIS)

    In appendix B, the models introduced in chapter 6 are applied to the study of the Chernobyl accident. This event is very important in the teaching of nuclear engineering, and I have included in this Appendix a relatively detailed description of the accident. However, the analysis is limited to the physics of the relevant phenomena. (author)

  4. MCNP trademark ENDF/B-VI validation: Infinite media comparisons of ENDF/B-VI and ENDF/B-V

    International Nuclear Information System (INIS)

    Infinite media calculations have been performed to validate the new MCNP ENDF/B-VI Library, ENDF60. All 124 nuclides have neutron flux and heating tallies compared against ENDF/B-V, as well as the MCNP Recommended Data Sets when these were not ENDF/B-V. For nuclides with photon production, photon flux and heating tallies have also been compared. All significant differences between the new ENDF60 results and those obtained with other data sets are discussed. This report provides a method for data comparison so that a better decision can be made as to the best data set to be used for a particular problem

  5. Extraction of uranium (VI) and thorium (IV) ions from nitric acid solutions by N.N.N'.N'-tetrabutylsuccinylamiide

    International Nuclear Information System (INIS)

    Solvent extraction of U(VI) and Th(IV) from nitric acid medium by N.N.N'.N'-tetrabutylsuccinylamide(TBSA) in a diluent composed of 50% trimethyl benzene (TMB) and 50% kerosene(OK) is described. Extraction coefficients of U(VI) and Th(IV) as a function of aqueous nitric acid concentration, extractant concentration and temperature have been studied. From the data, the compositions of extracted species, equilibrium constants and enthalpies of extraction reaction are also been calculated

  6. Localized energy associated with Bianchi-Type VI universe in $f(R)$ theory of gravity

    CERN Document Server

    Korunur, M

    2016-01-01

    In the present work, focusing on one of the most popular problems in modern gravitation theories, we consider generalized Lanndau-Liftshitz energy-momentum relation to calculate energy distribution of the Bianchi-Type VI spacetime in $f(R)$ gravity. Additionally, the results are specified by using some well-known $f(R)$-gravity models.

  7. VizieR Online Data Catalog: Ge V and Ge VI oscillator strengths (Rauch+, 2012)

    Science.gov (United States)

    Rauch, T.; Werner, K.; Biemont, E.; Quinet, P.; Kruk, J. W.

    2012-08-01

    Calculated HFR oscillator strengths (log gf) and transition probabilities (gA, in 1/s) in Ge V (table2.dat) and Ge VI (table4.dat). CF is the cancellation factor as defined by Cowan (1981, 1981tass.book.....C). In columns 3 and 6, e is written for even and o for odd. (2 data files).

  8. Adsorption of U(VI) from aqueous solutions onto dolomite

    International Nuclear Information System (INIS)

    Full text of publication follows: The release of radioactive substances into aqueous media is a very important subject in the context of high-level nuclear waste geologic repositories. Adsorption onto mineral surfaces is a very important process leading to the reduction of radionuclide concentrations in solution. Uranium is one of the well known radioactive substance whose adsorption behaviour may strongly vary depending on the environmental conditions such as adsorbent type and pH. Dolomite is a major and cheap source of magnesium and calcium. It is generally used in food and pharmaceutical industries, glass and building materials. In some conditions, dolomite can be used as an appropriate adsorbent for removal of some metal ions. Metal removal occurs because of the dual effect of electrostatic and chemical forces between mineral surfaces and ions. Adsorption of U(VI) onto dolomite is investigated by varying parameters such as solid to liquid ratio, contact time, pH and concentration of U(VI). 238U as uranyl nitrate is used for the experiments. The optimum solid to liquid ratio and contact time are found as 0.04 and 1 h, respectively. Formation of insoluble aqueous complexes of the U(VI) at higher pH values (pH>5), may change the mechanism of the adsorption phenomena on dolomite. Precipitation may occur at high pH values at studied uranium concentration (1.10-3 moL-1). The maximum adsorption is observed near pH 3. At this pH value UO22+ is dominant species in the solution. The data obtained from adsorption experiments are fitted to Frumkin, Langmuir and Dubinin-Radushkevich isotherms. The results calculated from adsorption isotherms evaluate the type of the adsorption. The adsorption dependence of uranium on temperature is investigated and thermodynamic parameters ΔHo, ΔSo and ΔGo are calculated. (authors)

  9. Plutonium(VI) accumulation and reduction by lichen biomass: correlation with U(VI).

    Science.gov (United States)

    Ohnuki, Toshihiko; Aoyagi, Hisao; Kitatsuji, Yoshihiro; Samadfam, Mohammad; Kimura, Yasuhiko; William Purvis, O

    2004-01-01

    The uptake of plutonium(VI) and uranium(VI) by lichen biomass was studied in the foliose lichen Parmotrema tinctorum to elucidate the migration behavior of Pu and U in the terrestrial environment. Pu and U uptake by P. tinctorum averaged 0.040+/-0.010 and 0.055+/-0.015 g gdry (-1), respectively, after 96 h incubation with 4.0 x 10(14) mol 1(-1) Pu solutions of pH 3, 4 and 5. SEM observations showed that the accumulated Pu is evenly distributed on the upper and lower surfaces of P. tinctorum, in contrast to U(VI), which accumulated in both cortical and medullary layers. UV/VIS absorption spectroscopy demonstrates that a fraction of Pu(VI) in the solution is reduced to Pu(V) by the organic substances released from P. tinctorum, and the accumulated Pu on the surface is reduced to Pu(IV), while U(VI) keeps the oxidation state of VI. Since the solubility of Pu(IV) hydroxides is very low, reduced Pu(VI) does not penetrate to the medullary layers, but is probably precipitated as Pu(IV) hydroxides on the cortical lichen surface. It is concluded that the uptake and reduction of Pu(VI) by lichens is important to determine the mobilization and oxidation states of Pu in the terrestrial environment. PMID:15381325

  10. Correlations between O VI Absorbers and Galaxies at Low Redshift

    CERN Document Server

    Ganguly, Rajib; Fang, Taotao; Sembach, Kenneth

    2008-01-01

    We investigate the relationship between galaxies and metal-line absorption systems in a large-scale cosmological simulation with galaxy formation. Our detailed treatment of metal enrichment and non-equilibrium calculation of oxygen species allow us, for the first time, to carry out quantitative calculations of the cross-correlations between galaxies and O VI absorbers. We find the following: (1) The cross-correlation strength depends weakly on the absorption strength but strongly on the luminosity of the galaxy. (2) The correlation distance increases monotonically with luminosity from ~0.5-1h^-1 Mpc for 0.1L* galaxies to ~3-5h^-1 Mpc for L* galaxies. (3) The correlation distance has a complicated dependence on absorber strength, with a luminosity-dependent peak. (4) Only 15% of O VI absorbers lie near >=Lz* galaxies. The remaining 85%, then, must arise ``near'' lower-luminosity galaxies, though, the positions of those galaxies is not well-correlated with the absorbers. This may point to pollution of intergala...

  11. Comparison of ENDF/B-V and VI cross sections for dosimetry foil reaction rates

    International Nuclear Information System (INIS)

    The objective of this study was to compare calculations of pressure vessel surveillance dosimetry foil reaction rates computed using the ENDF/B-V and ENDF/B-VI cross-section libraries. Reaction rates for dosimetry foils irradiated in the cavity surrounding the pressure vessel of a pressurized water reactor (PWR) were determined using the MCNP4A code with ENDF/B-V and -VI cross sections. The computed reaction rates were compared to measured ones obtained during three fuel cycles of the Arkansas Nuclear One Unit 1 (ANO-1)

  12. Mathematical modeling of the radiation-chemical behavior of Np(VI) in HNO3

    International Nuclear Information System (INIS)

    The literature contains many studies on the radiolytic behavior of Np(VI) in HNO3 solutions. These studies have been partially reviewed in a book. An attempt has been made to examine the mechanism of the radiation-chemical conversion of Np ions. However, the kinetic laws cannot be obtained and the mechanism of the reactions occurring cannot be accurately found without mathematical modeling. Mathematical modeling of the radiation-chemical behavior of Np(VI) in 0.5-6 M HNO3 is reported in the present article. Calculations using a special program were performed on an IBM PC/X5 personal computer

  13. Lattice Dynamics of II-VI materials using adiabatic bond charge model

    OpenAIRE

    Rajput, B. D.; Browne, D. A.

    1995-01-01

    We extend the adiabatic bond charge model, originally developed for group IV semiconductors and III-V compounds, to study phonons in more ionic II-VI compounds with a zincblende structure. Phonon spectra, density of states and specific heats are calculated for six II-VI compounds and compared with both experimental data and the results of other models. We show that the 6-parameter bond charge model gives a good description of the lattice dynamics of these materials. We also discuss trends in ...

  14. Cr(VI) retention and transport through Fe(III)-coated natural zeolite

    International Nuclear Information System (INIS)

    Graphical abstract: Breakthrough curves of Cr(VI) from columns packed with raw zeolite (a) and Fe(III)-zeolite (b). The solid line in (b) is the HYDRUS-1D fit to the observed data with adsorption term only, while the dashed line in (b) includes a reduction term in the HYDRUS-1D fit. Highlights: ► Zeolite modified with Fe(III) could be used for adsorption and retention of Cr(VI). ► The Fe present on zeolite was in an amorphous Fe(OH)3 form. ► A Cr(VI) adsorption capacity of 82 mg/kg was found on Fe(III)-zeolite. ► A Cr(VI) retardation factor of 3 or 5 was determined from column and batch studies. - Abstract: Cr(VI) is a group A chemical based on the weight of evidence of carcinogenicity. Its transport and retention in soils and groundwater have been studied extensively. Zeolite is a major component in deposits originated from volcanic ash and tuff after alteration. In this study, zeolite aggregates with the particle size of 1.4–2.4 mm were preloaded with Fe(III). The influence of present Fe(III) on Cr(VI) retention by and transport through zeolite was studied under batch and column experiments. The added Fe(III) resulted in an enhanced Cr(VI) retention by the zeolite with a capacity of 82 mg/kg. The Cr(VI) adsorption on Fe(III)-zeolite followed a pseudo-second order kinetically and the Freundlich adsorption isotherm thermodynamically. Fitting the column experimental data to HYDRUS-1D resulted in a retardation factor of 3 in comparison to 5 calculated from batch tests at an initial Cr(VI) concentration of 3 mg/L. The results from this study showed that enhanced adsorption and retention of Cr(VI) may happen in soils derived from volcanic ash and tuff that contains significant amounts of zeolite with extensive Fe(III) coating.

  15. Cr(VI) retention and transport through Fe(III)-coated natural zeolite

    Energy Technology Data Exchange (ETDEWEB)

    Du, Gaoxiang [School of Materials Science and Technology, China University of Geosciences, Beijing 100083 (China); Li, Zhaohui, E-mail: li@uwp.edu [School of Materials Science and Technology, China University of Geosciences, Beijing 100083 (China); Geosciences Department, University of Wisconsin-Parkside, Kenosha, WI 53144 (United States); Department of Earth Sciences, National Cheng Kung University, 1 University Road, Tainan 70101, Taiwan (China); Liao, Libing [School of Materials Science and Technology, China University of Geosciences, Beijing 100083 (China); Hanson, Renee; Leick, Samantha; Hoeppner, Nicole [Geosciences Department, University of Wisconsin-Parkside, Kenosha, WI 53144 (United States); Jiang, Wei-Teh [Department of Earth Sciences, National Cheng Kung University, 1 University Road, Tainan 70101, Taiwan (China)

    2012-06-30

    Graphical abstract: Breakthrough curves of Cr(VI) from columns packed with raw zeolite (a) and Fe(III)-zeolite (b). The solid line in (b) is the HYDRUS-1D fit to the observed data with adsorption term only, while the dashed line in (b) includes a reduction term in the HYDRUS-1D fit. Highlights: Black-Right-Pointing-Pointer Zeolite modified with Fe(III) could be used for adsorption and retention of Cr(VI). Black-Right-Pointing-Pointer The Fe present on zeolite was in an amorphous Fe(OH){sub 3} form. Black-Right-Pointing-Pointer A Cr(VI) adsorption capacity of 82 mg/kg was found on Fe(III)-zeolite. Black-Right-Pointing-Pointer A Cr(VI) retardation factor of 3 or 5 was determined from column and batch studies. - Abstract: Cr(VI) is a group A chemical based on the weight of evidence of carcinogenicity. Its transport and retention in soils and groundwater have been studied extensively. Zeolite is a major component in deposits originated from volcanic ash and tuff after alteration. In this study, zeolite aggregates with the particle size of 1.4-2.4 mm were preloaded with Fe(III). The influence of present Fe(III) on Cr(VI) retention by and transport through zeolite was studied under batch and column experiments. The added Fe(III) resulted in an enhanced Cr(VI) retention by the zeolite with a capacity of 82 mg/kg. The Cr(VI) adsorption on Fe(III)-zeolite followed a pseudo-second order kinetically and the Freundlich adsorption isotherm thermodynamically. Fitting the column experimental data to HYDRUS-1D resulted in a retardation factor of 3 in comparison to 5 calculated from batch tests at an initial Cr(VI) concentration of 3 mg/L. The results from this study showed that enhanced adsorption and retention of Cr(VI) may happen in soils derived from volcanic ash and tuff that contains significant amounts of zeolite with extensive Fe(III) coating.

  16. Simultaneous Adsorption of Chromium (VI) and Phosphate by Calcined Mg-Al-CO{sub 3} Layered Double Hydroxides

    Energy Technology Data Exchange (ETDEWEB)

    Song, Xiulan; Wu, Yuhong [Taiyuan Univ. of Technology, Shanxi (China)

    2014-06-15

    The adsorption characteristics of chromium (VI) and phosphate on calcined Mg-Al-CO{sub 3} layered double hydroxides (CLDH) were investigated in single and binary systems. A series of batch experiments were performed to study the influence of various experimental parameters. In this study, CLDH exhibited a high adsorption capacity for Cr (VI) and P in a single system. The experimental data were close to the theoretical adsorption capacity given by the Langmuir isotherm, the calculating adsorption capacities of Cr (VI) and P were up to 70.42 mg/g and 97.09 mg/g, respectively. It was found that the initial pH was approximately 6 and it took 24 h to reach equilibrium when P and Cr (VI) were added simultaneously. The experimental data were best fitted by a pseudo-second-order kinetics model. Competitive adsorption between Cr (VI) and P existed in the binary system. The presence of Cr (VI) had no significant influence on P adsorption. However, the suppression of Cr (VI) adsorption was obvious when the initial concentration of P was up to 10 mg/L with a concentration of 0.5 g/L of CLDH.

  17. Simultaneous Adsorption of Chromium (VI) and Phosphate by Calcined Mg-Al-CO3 Layered Double Hydroxides

    International Nuclear Information System (INIS)

    The adsorption characteristics of chromium (VI) and phosphate on calcined Mg-Al-CO3 layered double hydroxides (CLDH) were investigated in single and binary systems. A series of batch experiments were performed to study the influence of various experimental parameters. In this study, CLDH exhibited a high adsorption capacity for Cr (VI) and P in a single system. The experimental data were close to the theoretical adsorption capacity given by the Langmuir isotherm, the calculating adsorption capacities of Cr (VI) and P were up to 70.42 mg/g and 97.09 mg/g, respectively. It was found that the initial pH was approximately 6 and it took 24 h to reach equilibrium when P and Cr (VI) were added simultaneously. The experimental data were best fitted by a pseudo-second-order kinetics model. Competitive adsorption between Cr (VI) and P existed in the binary system. The presence of Cr (VI) had no significant influence on P adsorption. However, the suppression of Cr (VI) adsorption was obvious when the initial concentration of P was up to 10 mg/L with a concentration of 0.5 g/L of CLDH

  18. 12 CFR Appendix A to Subpart B of... - Risk-Based Capital Stress Test

    Science.gov (United States)

    2010-01-01

    ... 12 Banks and Banking 6 2010-01-01 2010-01-01 false Risk-Based Capital Stress Test A Appendix A to... Appendix A to Subpart B of Part 652— Risk-Based Capital Stress Test 1.0Introduction. 2.0Credit Risk. 2... in the Stress Test. 3.0Interest Rate Risk. 3.1Process for Calculating the Interest Rate Movement....

  19. ViA: a perceptual visualization assistant

    Science.gov (United States)

    Healey, Chris G.; St. Amant, Robert; Elhaddad, Mahmoud S.

    2000-05-01

    This paper describes an automated visualized assistant called ViA. ViA is designed to help users construct perceptually optical visualizations to represent, explore, and analyze large, complex, multidimensional datasets. We have approached this problem by studying what is known about the control of human visual attention. By harnessing the low-level human visual system, we can support our dual goals of rapid and accurate visualization. Perceptual guidelines that we have built using psychophysical experiments form the basis for ViA. ViA uses modified mixed-initiative planning algorithms from artificial intelligence to search of perceptually optical data attribute to visual feature mappings. Our perceptual guidelines are integrated into evaluation engines that provide evaluation weights for a given data-feature mapping, and hints on how that mapping might be improved. ViA begins by asking users a set of simple questions about their dataset and the analysis tasks they want to perform. Answers to these questions are used in combination with the evaluation engines to identify and intelligently pursue promising data-feature mappings. The result is an automatically-generated set of mappings that are perceptually salient, but that also respect the context of the dataset and users' preferences about how they want to visualize their data.

  20. Adsorption and desorption of uranium(VI) by Fe-Mn binary oxide in aqueous solutions

    International Nuclear Information System (INIS)

    The adsorption and desorption behaviors of uranium(VI) by a synthetic Fe/Mn (mass ratio of 57:1) binary oxide (FMBO) has been investigated. The pseudo-second-order kinetic and the Dubinin-Radushkevich isotherm models showed.that the adsorption process involved chemical adsorption. The calculated thermodynamic parameters (ΔHdeg, ΔSdeg, ΔGdeg) indicated that the adsorption process of uranium(VI) onto FMBO was spontaneous and endothermic. The desorption experiments indicated that the high desorption rate of uranium(VI) from FMBO by organic acids would increase the total solubility of uranium (in the exchangeable form), which would in turn enhance bio-absorption of uranium from soil via phytoremediation. (author)

  1. Computing Effect Size Measures with ViSta-The Visual Statistics System

    OpenAIRE

    Nuria Cortada de Kohan; Guillermo Macbeth; Rubén Daniel Ledesma

    2009-01-01

    Effect size measures are recognized as a necessary complement to statistical hypothesis testing because they provide important information that such tests alone cannot offer. In this paper we: a) briefly review the importance of effect size measures, b) describe some calculation algorithms for the case of the difference between two means, and c) provide a new and easy-to-use computer program to perform these calculations within ViSta The Visual Statistics System. A worked example is also prov...

  2. Merilni modul za višino kvadrokopterja nad tlemi

    OpenAIRE

    Klajderič, Aljoša

    2016-01-01

    Tematika diplomske naloge je opis in izdelava višinomera za kvadrokopterje. Višinomer je instrument, ki meri višino objekta nad ravnjo nadmorske višine. Za merjenje višine se uporabljajo metode, ki temeljijo na preletu ultrazvočnega valovanja ter na razliki zračnega tlaka. Merilniški modul meri višino na obeh fizikalnih načelih, torej na preletu ultrazvočnega valovanja, tlačni razliki in na fuzijski ravni oziroma na združitvi obeh fizikalnih načel. Namen diplomske naloge je bilo razumeti omej...

  3. Biosorption characteristics of uranium(VI) from aqueous solution by pummelo peel

    International Nuclear Information System (INIS)

    The biomass pummelo peel was chosen as a biosorbent for removal of uranium(VI) from aqueous solution. The feasibility of adsorption of U(VI) by Pummelo peel was studied with batch adsorption experiments. The effects of contact time, biosorbent dosage and pH on adsorption capacity were investigated in detail. The pummelo peel exhibited the highest U(VI) sorption capacity 270.71 mg/g at an initial pH of 5.5, concentration of 50 μg/mL, temperature 303 K and contacting time 7 h. The adsorption process of U(VI) was found to follow the pseudo-second-order kinetic equation. The adsorption isotherm study indicated that it followed both the Langmuir adsorption isotherm and the Freundlich adsorption isotherm. The thermodynamic parameters values calculated clearly indicated that the adsorption process was feasible, spontaneous and endothermic in nature. These properties show that the pummelo peel has potential application in the removal of the uranium(VI) from the radioactive waste water. (author)

  4. Thermodynamics of U(VI) and Eu(III) complexation by unsaturated carboxylates

    International Nuclear Information System (INIS)

    Highlights: → ΔH and log K determined for U(VI) and Eu(III) complexes with maleate and fumarate. → log K and coordination environment of Eu(III) complexes has been studied by TRFS. → Higher log K of U(VI) complexes than Eu(III) complexes is due to higher entropy. → Plot of log K vs log KP suggest charge polarization in fumarate complexes. → Ab initio calculations support charge polarization in fumarate complexes. - Abstract: The thermodynamic parameters (ΔG, ΔH and ΔS) of complexation of U(VI) and Eu(III) by unsaturated dicarboxylic acids, namely, maleic and fumaric acid, has been determined by potentiometric and microcalorimetric titrations at fixed ionic strength (I = 1.0 M) and temperature (298 K). The results show formation of 1:1 complexes by both the ligands with Eu(III). In the case of U(VI), maleate forms both 1:1 and 1:2 complexes, while only 1:1 complex was formed with fumarate. The fluorescence emission spectra of Eu(III)-dicarboxylate solutions at varying ligand to metal ratio were also used to obtain their stability constants. In addition, the fluorescence lifetimes reveal higher dehydration of Eu(III)-maleate compared to Eu(III)-fumarate which corroborates the ΔS values. The thermodynamic quantities suggest charge polarization effects in the case of U(VI) and Eu(III) complexes of fumarate, which is further corroborated by theoretical calculations. For the same ligand, U(VI) complexes were found to be more stable which was mainly due to higher entropy term.

  5. Comparison of decay and yield data between JNDC2 and ENDF/B-VI

    Energy Technology Data Exchange (ETDEWEB)

    Oyamatsu, K.; Sagosaka, M.; Miyazono, T. [Nagoya Univ. (Japan)

    1997-03-01

    This work is intended to be our first step to solve disagreements of the decay heat powers between measurements and summation calculations. We examine differences between nuclear data libraries to complement our uncertainty evaluation of the decay heat summation calculations only with ENDF/B-VI. The comparison is made mainly between JNDC2 and ENDF/B-VI while JEF2.2 decay data is also discussed. In this study, we propose and use a simple method which is an analogue of the overlap integral of two wave functions in quantum mechanics. As the first step, we compare the whole input nuclear data for the summation calculations as a whole. We find a slight difference of the fission yields especially for high-energy neutron induced fissions between JNDC2 and ENDF/B-VI. As for the decay energies, JNDC2, ENDF/B-VI are quite similar while JEF2.2 is found significantly different from these two libraries. We find substantial differences in the decay constant values among the three libraries. As the second step, we calculate the decay heat powers with FPGS90 using JNDC2 and ENDF/B-VI. The total decay heat powers with the two libraries differ by more than 10% at short cooling times while they agree well on the average at cooling times longer that 100 (s). We also point out nuclides whose contributions are significantly different between the two libraries even though the total decay heats agree well. These nuclides may cause some problems in predicting aggregate spectra of {beta} and {gamma} rays as well as delayed neutrons, and are to be reviewed in the future revision of decay and yield data. (author)

  6. ViHAP3D - Final report

    OpenAIRE

    Scopigno, Roberto

    2005-01-01

    Nearly all of our cultural heritage is inherently three-dimensional. Recent hard- and software developments enabled 3D computer graphics to be one of the most powerful means to represent complex data sets. The ViHAP3D project (ViHAP3D is an acronym for Virtual Heritage - High Quality 3D Acquisition and Presentation) aimed therefore at preserving, presenting, accessing, and promoting cultural heritage using interactive, high-quality 3D graphics. The vision of the project was to create an exact...

  7. Kinetics and Mechanism of the Reaction of a Ruthenium(VI) Nitrido Complex with HSO3 (-) and SO3 (2-) in Aqueous Solution.

    Science.gov (United States)

    Wang, Qian; Zhao, Hong Yan; Man, Wai-Lun; Lam, William W Y; Lau, Kai-Chung; Lau, Tai-Chu

    2016-07-25

    The kinetics and mechanism of the reaction of S(IV) (SO3 (2-) +HSO3 (-) ) with a ruthenium(VI) nitrido complex, [(L)Ru(VI) (N)(OH2 )](+) (Ru(VI) N, L=N,N'-bis(salicylidene)-o-cyclohexyldiamine dianion), in aqueous acidic solutions are reported. The kinetic results are consistent with parallel pathways involving oxidation of HSO3 (-) and SO3 (2-) by Ru(VI) N. A deuterium isotope effect of 4.7 is observed in the HSO3 (-) pathway. Based on experimental results and DFT calculations the proposed mechanism involves concerted N-S bond formation (partial N-atom transfer) between Ru(VI) N and HSO3 (-) and H(+) transfer from HSO3 (-) to a H2 O molecule. PMID:27246832

  8. Sorption of U(VI) on natural sepiolite and sepiolite-agar agar composite adsorbent

    International Nuclear Information System (INIS)

    Adsorption of uranium (VI) ions onto clay minerals is one of the significant reactions affecting the transport of uranium in the environment. The use of composite adsorbents for the removal of metal ions and radionuclide from industrial wastes has attracted great interest to researchers in recent years[1]. In this study, natural sepiolite type clay and an organic compound, agar agar, were chosen as the adsorbent material. Composite adsorbent was prepared from sepiolite and agar agar. Adsorption of uranium (VI) on this composite and on natural sepiolite adsorbent was investigated. Thermodynamic investigations were carried out to get more information about the adsorption of uranium. Adsorption of U (VI) has been studied as a function of solution pH, time, temperature and initial concentration of uranium on natural sepiolite and agar agar composite. The maximum sorption yield of U (VI) on composite and on sepiolite from batch experiments is calculated approximately 89% and 76% respectively in the optimum experimental adsorption condition. The adsorption data were fitted to Freundlich and Dubinin-Radushkevich (D-R) adsorption isotherms. Using the experimental data obtained different temperatures, thermodynamic constants ΔHdegree, ΔSdegree and ΔGdegree were calculated. The results show that the adsorption process on natural sepiolite and sepiolite-agar agar composite are both egzothermic natures. [1] S. M. Hasany, M. M. Saeed, M. Ahmed, J. Radioanal. Nucl. Chem. Vol. 252 (3), 477-484 (2002)

  9. Det øvrige vi nyde

    DEFF Research Database (Denmark)

    Dam, Peder

    persiller, og at vi i dag kan kortlægge disse som egnsspecifikke persiller. Men den samlede størrelse af landgilden, angivet i fællesenheden tønder hartkorn, og de forskellige produkter, som landgilden blev ydet i, persillerne, var ikke en afspejling af produktionen, sådan som flere historikere har tolket...

  10. 29 CFR 1926.1126 - Chromium (VI).

    Science.gov (United States)

    2010-07-01

    ... CFR 1926.51 Where skin contact with chromium (VI) occurs, the employer shall provide washing facilities in conformance with 29 CFR 1926.51. Eating and drinking areas provided by the employer shall also... requirements of the Hazard Communication Standard, 29 CFR 1910.1200. (3) Cleaning and replacement. (i)...

  11. 29 CFR 1910.1026 - Chromium (VI).

    Science.gov (United States)

    2010-07-01

    ... CFR 1910.141. Where skin contact with chromium (VI) occurs, the employer shall provide washing facilities in conformance with 29 CFR 1910.141. Eating and drinking areas provided by the employer shall also... requirements of the Hazard Communication Standard, 29 CFR 1910.1200. (3) Cleaning and replacement. (i)...

  12. 29 CFR 1915.1026 - Chromium (VI).

    Science.gov (United States)

    2010-07-01

    ... CFR 1910.141. Where skin contact with chromium (VI) occurs, the employer shall provide washing facilities in conformance with 29 CFR 1915.97. Eating and drinking areas provided by the employer shall also... requirements of the Hazard Communication Standard, 29 CFR 1910.1200. (3) Cleaning and replacement. (i)...

  13. Thermodynamical analysis of the fission product release in the ORNL VI-3 and VI-5 tests

    International Nuclear Information System (INIS)

    The thermodynamical equilibrium hypothesis has been applied to the tests ORNL (Oak Ridge National Laboratory) VI-3 and VI-5 (Vertical Induction heated), to study fission release products. Irradiated fuel samples were heated under oxidizing (VI-3) and reducing (VI-5) controlled atmosphere. They can be compared to the Vercors 4 and 5 tests. The thermodynamical calculus results of barium and ruthenium fission products release, agree in the lump with measures, whatever the gas phase nature. The strontium release calculus under reducing atmosphere, is largely upper than those measured and correctly evaluated under oxidizing atmosphere. These results confirm those obtained for Vercors 4 and 5 and show the interest of the select model. (A.L.B.)

  14. Quadrant III RFI draft report: Appendix J, Baseline risk assessment

    International Nuclear Information System (INIS)

    In accordance with the Risk Assessment Guidance for Superfund (U. S.EPA 1989), which states that background risk should be calculated separately from site-related risk in order to provide important information to the risk manager, this appendix assesses the human health risks associated with background levels of naturally occurring compounds in soil at the Portsmouth Gaseous Diffusion Plant (PORTS). This appendix is organized as follows: Background Conditions, in which the results of Geraghty ampersand Miller's work on characterizing background levels of naturally occurring compounds in soils is summarized; Identification of Exposure Pathways; Estimation of Environmental Concentrations; Estimation of Human Intake; Toxicity Assessment, and Risk Characterization, in which numerical estimates of carcinogenic and noncarcinogenic risk are calculated for each naturally occurring compound and potential exposure pathway

  15. Reduction of Pu(VI) on Fe surfaces: soft x-ray absorption and resonant inelastic scattering study

    Energy Technology Data Exchange (ETDEWEB)

    Butorin, S.M.; Kvashnina, K.O.; Modin, A.; Nordgren, J. (Dept. of Physics and Materials Science, Uppsala Univ., Uppsala (Sweden)); Guo, J.H. (Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA (United States)); Shuh, D.K. (Chemical Science Div., Lawrence Berkeley National Laboratory, Berkeley, CA (United States)); Werme, L. (Swedish Nuclear Fuel and Waste Management Co., Stockholm (Sweden))

    2009-03-15

    Based on analysis of spectral shapes, their dependence on the energy of incident photons and comparison with model calculations and experimental data from the reference sample we can conclude that plutonium from the Pu(VI) solution sorbed on Fe surfaces is likely to be reduced and Pu species sorbed on the Fe foils are mainly in the form of Pu (IV). Current results correlate with what was observed for for Np (V) and U (VI) in our previous studies. Furthermore, combined analysis of present data with model atomic multiplet calculations of RIXS and XAS spectra suggests that significant presence of Pu(III) on the Fe foils is unlikely

  16. 14 CFR 36.803 - Noise evaluation and calculation.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 1 2010-01-01 2010-01-01 false Noise evaluation and calculation. 36.803 Section 36.803 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION... evaluation and calculation. The noise measurement data required under § 36.801 and obtained under appendix...

  17. ENDF-201, ENDF/B-VI summary documentation supplement 1, ENDF/HE-VI summary documentation

    International Nuclear Information System (INIS)

    The National Nuclear Data Center (NNDC) provides coordination for and serves as the secretariat to the Cross Section Evaluation Working Group (CSWEG). CSEWG is responsible for the oversight of the ENDF/B Evaluated Nuclear Data File. All data are checked and reviewed by CSEWG, and the file is maintained at the NNDC. For a description of the ENDF/B-VI file, see the ENDF-102 Data Formats and Procedures for the Evaluated Nuclear Data File ENDF-6. The purpose of this addendum to the ENDF/B-VI Summary Documentation is to provide documentation of Releases 1, 2, 3, and 4 for the ENDF/B-VI and ENDF/HE-VI evaluated nuclear data libraries. These releases contain many new and revised evaluations for the neutron, photo-atomic interaction, radioactive decay data, spontaneous fission product yield, neutron-induced fission product yield, thermal neutron scattering, proton, deuteron, and triton sublibraries. The summaries have been extracted mainly from the ENDF/B-VI File 1 comments (MT = 451), which have been checked, edited, and may also include supplementary information. Some summaries have been provided by the evaluators in electronic format, while others are extracted from reports on the evaluations. All references have been checked and corrected, or updated where appropriate. A list of the laboratories which have contributed evaluations used in ENDF/B-VI is given

  18. 7 CFR 3402.16 - Appendix.

    Science.gov (United States)

    2010-01-01

    ... 7 Agriculture 15 2010-01-01 2010-01-01 false Appendix. 3402.16 Section 3402.16 Agriculture... FELLOWSHIP GRANTS PROGRAM Preparation of an Application § 3402.16 Appendix. Any additional supporting information deemed essential to enhancing the application should be included in an Appendix and referenced...

  19. Evaluating the Performance of Iron Nano Particle Resin (Liwatit FO36 in Removing Cr (VI from Aqueous Solutions

    Directory of Open Access Journals (Sweden)

    Lida Rafati

    2009-01-01

    Full Text Available Introduction: Chromium (VI can be removed from aqueous solutions using different but expensive methods. In this study a new method using Liwatit exchange resin was developed to remove chromium (VI. Methods: Removing the chromium (VI ion from the aqueous solution was studied via considering the effect of absorbent initial chromium concentration contact time and pH in batch phase. Equilibrium constant which depends on the capacity of change was calculated using Longmuir adsorption isotherm. Results: The Batch ion-exchange process was relatively fast and it reached equilibrium after about 90 minutes of contact. The ion-exchange process which is pH dependent show maximum removal of Cr(VI in the pH range 5.0-8.0 for an initial Cr(VI concentration of 0.5 mg L-1. Lewatit FO 36 shows high bonding constant. The equilibrium related to its ion-exchange capacity and the amount of the ion exchange was obtained by using the plots of the Langmuir adsorption isotherm. It was observed that the maximum ion-exchange capacity of 0.29 mmol of Cr (VI/g for Lewatit FO 36 was achieved at optimum pH value of 6.0. The ion exchange of Cr (VI on this cation-exchange resin followed first-order reversible kinetics. Conclusion: According to the results because of its regeneration characteristic Liwatit FO36 resin can be used as a convenient optimum to reduce the level of Cr(VI from the aqueous solutions in the contaminated places throuhout the country particularly South Khorasan province where the problem of chromium in fresh water is ubiquitous

  20. 40 CFR Appendix Vi to Part 86 - Vehicle and Engine Components

    Science.gov (United States)

    2010-07-01

    ...) Carburetor-idle RPM, mixture ratio. (3) Choke mechanism. (4) Fuel system filter and fuel system lines and.... Lubricant. II. Fuel System. (1) Fuel type. (2) Fuel pump. (3) Fuel filters. (4) Injectors. (5) Governor. III... Components. (1) Carburetor air cleaner filter. (2) Hot air control valve. (b) Diesel Light-Duty......

  1. 15 CFR Appendix A to Part 8 - Federal Financial Assistance Covered by Title VI

    Science.gov (United States)

    2010-01-01

    ... States for restoration and management of sport or recreational species (16 U.S.C. 777-777i; 777k). 11... support establishment of major university centers for marine research, education, training, and...

  2. CERREX Software Application to the Japan Research Reactor No. 2 (JRR-2) Decommissioning Programme. Appendix VI

    International Nuclear Information System (INIS)

    The JRR-2 was a heavy water moderated and cooled CP-5 type research reactor. It used highly enriched uranium fuels to obtain a neutron flux of 1.8 x 1014 n.cm-2.s-1 and achieve 10 MW thermal power. The reactor first went critical in October 1960 and was used for neutron scattering experiments, irradiation tests of nuclear fuels and materials, radioisotope production, boron neutron capture therapy, etc. The JRR-2 was finally shut down owing to degradation of the facility after 36 years of operation. The JRR-2 decommissioning project started in August 1997. The project was divided into four major phases: - Phase 1: Preparation (shutdown related activities). - Phase 2: Isolation of cooling systems and the reactor body. - Phase 3: Tritium decontamination and dismantling of cooling system components. - Phase 4: Removal of the reactor vessel and dismantling of remaining facilities. Activities implemented within Phases 1-3 were completed by 2005. The reactor vessel has been isolated for safe storage until Phase 4 begins. The major activities are listed. The actual expenditures of the contractual work are as follows: - Phase 1: 62 000 000 yen ( Euro 470 000). - Phase 2: 200 000 000 yen ( Euro 1 500 000). - Phase 3: 356 000 000 yen ( Euro 2 700 000)

  3. Appendix VI: KHNP staffing plan of construction site office: ULCHIN 5 and 6 construction project (ROK)

    International Nuclear Information System (INIS)

    KHNP, as an owner/operator organization, is responsible for all project activities including design, procurement, construction, and commissioning, for Korea's nuclear power plant (NPP) construction projects. Four separate functional offices of KHNP are set up to complete the construction management work. These offices are (1) home office, (2) field construction office, (3) field quality assurance office, and (4) field startup/commissioning office. This paper presents a staffing plan for the field construction office starting initial project implementation to final turnover to operations stages. It is recognized that the plan may not be applicable to other utility situations in terms of project management of site activity depending upon how the overall project contract is structured

  4. Examples from Member State Inspection Programmes: United States of America. Appendix VI

    International Nuclear Information System (INIS)

    The Nuclear Regulatory Commission (NRC) inspection programme is its principal process for collecting information about licensee performance. NRC inspectors perform a fundamental role in collecting this information and in determining whether or not licensees operate their plants safely and in accordance with their regulatory requirements and commitments. The NRC has resident inspectors assigned to each plant and construction site and augments the inspections, as appropriate, by sending additional inspectors from NRC regional offices and headquarters. New Nuclear Power Plant Construction Inspection Programme: The construction inspection programme (CIP) for new reactors provides reasonable assurance that the facility has been constructed and will be operated in conformity with the licence and NRC rules and regulations - recognizing that the NRC has finite inspection resources. The CIP for new reactors is based on inspections of the Inspections, Tests, Analyses and Acceptance Criteria (ITAAC) and construction and operational programmes which are identified in the licensee's combined licence (COL). The inspection programme is discussed in greater detail in the NRC Inspection Manual Chapter (IMC) 2503, and IMC 2504. IMC 2503 and 2504 inspections continue until the 10 CFR 52.103(g) finding has been made by the NRC. The ITAAC inspection philosophy contained in IMC 2503 recognizes that several ITAAC are expected to be closely related, thereby providing the NRC with the opportunity to evaluate a group of ITAAC based upon an examination of some representative ITAAC within the group. Such an inspection approach would allow for the efficient use of NRC inspection resources, not only for ITAAC examinations but also for the routine evaluation of the construction processes that result in ITAAC products and completion

  5. Decommissioning of Facilities Containing Disused Sealed Radioactive Sources: Radioisotope Thermoelectric Generators. Appendix VI

    International Nuclear Information System (INIS)

    Orphan sources (abandoned or unused radioactive sources) need to be controlled and decommissioned to avoid unauthorized use or tampering, either of which can present a major health hazard. Orphan sources can have high levels of radioactivity, as in the case of the radioisotope thermoelectric generators (RTGs) used by the Russian Federation and the United States of America. These are safe when under supervision and treated in accordance with normal practice for the management of large sources; however, where they are not under controlled surveillance, they are liable to vandalism or theft. RTGs may often be considered orphan sources and there are similar uncertainties pertaining to the numbers and the locations

  6. Extraction of Mo(VI) and U(VI) by alamine 310 and its mixtures from aq. HCl media

    International Nuclear Information System (INIS)

    Extractions of Mo(VI) and U(VI) by Alamine 310, TBP, DPSO and their mixtures are quantitative in the range 6-8 M, and by Cyanex 301 and its mixtures at lower acidity (∼0.2 M). Quantitative extraction of U(VI) is achieved by mixtures of Alamine 310 and TBP from 1 M HCl in presence of SCN- ion (∼0.2 M). Synergism is marked in the extraction of Mo(VI) by the mixtures of Alamine 310 and TBP/Cyanex 301, and for U(VI) by mixtures of Alamine 310 and DPSO/Cyanex 301. (author). 9 refs

  7. Computing Effect Size Measures with ViSta-The Visual Statistics System

    Directory of Open Access Journals (Sweden)

    Nuria Cortada de Kohan

    2009-03-01

    Full Text Available Effect size measures are recognized as a necessary complement to statistical hypothesis testing because they provide important information that such tests alone cannot offer. In this paper we: a briefly review the importance of effect size measures, b describe some calculation algorithms for the case of the difference between two means, and c provide a new and easy-to-use computer program to perform these calculations within ViSta “The Visual Statistics System”. A worked example is also provided to illustrate some practical issues concerning the interpretation and limits of effect size computation. The audience for this paper includes novice researchers as well as ViSta’s user interested on applying effect size measures.

  8. IV-VI ferromagnetic semiconductors recent studies

    Directory of Open Access Journals (Sweden)

    Dobrowolski W.

    2006-01-01

    Full Text Available In some IV-VI semimagnetic semiconductors, the RKKY interaction can dominate over the standard d-d superexchange and become the driving mechanism for ion-ion coupling. In effect, for low hole concentrations the Mn ion system is in a paramagnetic phase, whereas for higher ones it reveals typical ferromagnetic behavior. In this paper, recent work on IV-VI ferromagnetic (SnMnTe, PbSnMnTe and GeMnTe systems will be presented. In particular, the influence of the presence of two types of magnetic ions (transition metal: Mn and rare earth metal: Eu or Er incorporated into a semiconductor matrix on magnetic properties of resultant semimagnetic semiconductor will be described.

  9. Diagnostic and treatment strategies in mucopolysaccharidosis VI

    Science.gov (United States)

    Vairo, Filippo; Federhen, Andressa; Baldo, Guilherme; Riegel, Mariluce; Burin, Maira; Leistner-Segal, Sandra; Giugliani, Roberto

    2015-01-01

    Mucopolysaccharidosis VI (MPS VI) is a very rare autosomal recessive disorder caused by mutations in the ARSB gene, which lead to deficient activity of the lysosomal enzyme ASB. This enzyme is important for the breakdown of the glycosaminoglycans (GAGs) dermatan sulfate and chondroitin sulfate, which accumulate in body tissues and organs of MPS VI patients. The storage of GAGs (especially dermatan sulfate) causes bone dysplasia, joint restriction, organomegaly, heart disease, and corneal clouding, among several other problems, and reduced life span. Despite the fact that most cases are severe, there is a spectrum of severity and some cases are so attenuated that diagnosis is made late in life. Although the analysis of urinary GAGs and/or the measurement of enzyme activity in dried blood spots are useful screening methods, the diagnosis is based in the demonstration of the enzyme deficiency in leucocytes or fibroblasts, and/or in the identification of pathogenic mutations in the ARSB gene. Specific treatment with enzyme replacement has been available since 2005. It is safe and effective, bringing measurable benefits and increased survival to patients. As several evidences indicate that early initiation of therapy may lead to a better outcome, newborn screening is being considered for this condition, and it is already in place in selected areas where the incidence of MPS VI is increased. However, as enzyme replacement therapy is not curative, associated therapies should be considered, and research on innovative therapies continues. The management of affected patients by a multidisciplinary team with experience in MPS diseases is highly recommended. PMID:26586959

  10. Diagnostic and treatment strategies in mucopolysaccharidosis VI.

    Science.gov (United States)

    Vairo, Filippo; Federhen, Andressa; Baldo, Guilherme; Riegel, Mariluce; Burin, Maira; Leistner-Segal, Sandra; Giugliani, Roberto

    2015-01-01

    Mucopolysaccharidosis VI (MPS VI) is a very rare autosomal recessive disorder caused by mutations in the ARSB gene, which lead to deficient activity of the lysosomal enzyme ASB. This enzyme is important for the breakdown of the glycosaminoglycans (GAGs) dermatan sulfate and chondroitin sulfate, which accumulate in body tissues and organs of MPS VI patients. The storage of GAGs (especially dermatan sulfate) causes bone dysplasia, joint restriction, organomegaly, heart disease, and corneal clouding, among several other problems, and reduced life span. Despite the fact that most cases are severe, there is a spectrum of severity and some cases are so attenuated that diagnosis is made late in life. Although the analysis of urinary GAGs and/or the measurement of enzyme activity in dried blood spots are useful screening methods, the diagnosis is based in the demonstration of the enzyme deficiency in leucocytes or fibroblasts, and/or in the identification of pathogenic mutations in the ARSB gene. Specific treatment with enzyme replacement has been available since 2005. It is safe and effective, bringing measurable benefits and increased survival to patients. As several evidences indicate that early initiation of therapy may lead to a better outcome, newborn screening is being considered for this condition, and it is already in place in selected areas where the incidence of MPS VI is increased. However, as enzyme replacement therapy is not curative, associated therapies should be considered, and research on innovative therapies continues. The management of affected patients by a multidisciplinary team with experience in MPS diseases is highly recommended. PMID:26586959

  11. Nanomaterials based on II-VI Semiconductors

    OpenAIRE

    Cozzarini, Luca

    2012-01-01

    This thesis describes: (i) synthesis and characterization of colloidal nanocrystals of II-VI semiconductor compounds; (II) development of two novel materials using such nanocrystals as “building blocks”: (IIa) a nanocrystals/polymer composite, to be used as phosphor in LED-based lighting devices; (IIb) an inorganic, nano-structured multiphase material, showing a promising geometry as an electronic intermediate band material. Different typologies of nanocrystals (single-phase, alloyed or ...

  12. Waste-Management Education and Research Consortium (WERC) annual progress report, 1991--1992. Appendixes

    Energy Technology Data Exchange (ETDEWEB)

    1992-04-07

    This report contains the following appendices: Appendix A - Requirements for Undergraduate Level; Appendix B - Requirements for Graduate Level; Appendix C - Graduate Degree In Environmental Engineering; Appendix D - Non-degree Certificate Program; Appendix E - Curriculum for Associate Degree Program; Appendix F - Curriculum for NCC Program; Appendix G - Information 1991 Teleconference Series; Appendix H - Information on 1992 Teleconference Series; Appendix I - WERC interactive Television Courses; Appendix J - WERC Research Seminar Series; Appendix K - Sites for Hazardous/Radioactive Waste Management Series; Appendix L- Summary of Technology Development of the Second Year; Appendix M - List of Major Publications Resulting from WERC; Appendix N - Types of Equipment at WERC Laboratories.

  13. [Ecotoxicological effect and soil environmental criteria of the heavy metal chromium(VI)].

    Science.gov (United States)

    Wang, Xiao-Nan; Liu, Zheng-Tao; Wang, Wan-Hua; Zhang, Cong; Chen, Li-Hong

    2014-08-01

    Nowadays, systematic studies about water quality criteria are being carried out in China, but studies on soil environmental criteria are comparatively insufficient. In this study, germination and root growth of 8 terrestrial plants (Triticum aestivum, Lactuca sativa, Cucumis sativus, Zea mays, Brassica pekinensis, Glycine max, Allium tuberosum and Solanum lycopersicum) and growth inhibition of 1 terrestrial animal (Achatina fulica) were used to determine the chronic ecotoxicological effects of chromium (VI) using the agricultural moisture soil of Baoding. In addition, with the native toxicity data selected, the HC5 (hazardous concentration for 5% of species) and the ecological protected soil environmental criteria of chromium (VI) in Baoding moisture soil were calculated using the log-normal species sensitivity distribution (SSD) method. Results showed that the no observed effect concentration (NOEC) values for the growth of the terrestrial plants T. aestivum, L. sativa, C. sativus, Z. mays, B. pekinensis, G. max, A. tuberosum, S. lycopersicum, and the terrestrial invertebrate snail A. fulica were 19.0, 21.0, 28.0, 32.0, 28.0, 32.0, 32.0, 12.0 and 20.0 mg x kg(-1), respectively. The comparison of species toxicity data that were tested in the same conditions showed that the terrestrial plant S. lycopersicum was the most sensitive species to chromium (VI), T. aestivum and L. sativa had the same sensitivity to chromium (VI) exposure, whereas, plants C. sativus, Z. mays, B. pekinensis, G. max and A. tuberosum had the same sensitivity to chromium (VI) exposure. Finally, the HC5 value of chromium (VI) in the moisture soil of Baoding was calculated to be 7.7 (4.1 < CI < 11. 3) mg x kg(-1) using the log-normal SSD method, and the ecological protected soil environmental criteria of chromium (VI) was 1.5-7.7 mg x kg(-1). With the investigation of this work, we expect that it could provide useful information for the study of soil environmental criteria in China. PMID:25338393

  14. Identifying the need for a multidisciplinary approach for early recognition of mucopolysaccharidosis VI (MPS VI).

    Science.gov (United States)

    Choy, Yew Sing; Bhattacharya, Kaustuv; Balasubramaniam, Shanti; Fietz, Michael; Fu, Antony; Inwood, Anita; Jin, Dong-Kyu; Kim, Ok-Hwa; Kosuga, Motomichi; Kwun, Young Hee; Lin, Hsiang-Yu; Lin, Shuan-Pei; Mendelsohn, Nancy J; Okuyama, Torayuki; Samion, Hasri; Tan, Adeline; Tanaka, Akemi; Thamkunanon, Verasak; Thong, Meow-Keong; Toh, Teck-Hock; Yang, Albert D; McGill, Jim

    2015-05-01

    Mucopolysaccharidosis VI (MPS VI, Maroteaux-Lamy syndrome) is caused by deficient activity of the enzyme, N-acetylgalactosamine-4-sulfatase, resulting in impaired degradation of the glycosaminoglycan dermatan sulfate. Patients experience a range of manifestations including joint contractures, short stature, dysostosis multiplex, coarse facial features, decreased pulmonary function, cardiac abnormalities, corneal clouding and shortened life span. Recently, clinicians from institutions in the Asia-Pacific region met to discuss the occurrence and implications of delayed diagnosis and misdiagnosis of MPS VI in the patients they have managed. Eighteen patients (44% female) were diagnosed. The most common sign presented by the patients was bone deformities in 11 patients (65%). Delays to diagnosis occurred due to the lack of or distance to diagnostic facilities for four patients (31%), alternative diagnoses for two patients (15%), and misleading symptoms experienced by two patients (15%). Several patients experienced manifestations that were subtler than would be expected and were subsequently overlooked. Several cases highlighted the unique challenges associated with diagnosing MPS VI from the perspective of different specialties and provide insights into how these patients initially present, which may help to elucidate strategies to improve the diagnosis of MPS VI. PMID:25892708

  15. Interaction between magnetic layers in structures with narrow-gap IV-VI semiconductors

    International Nuclear Information System (INIS)

    The results of calculation of the indirect exchange interaction between magnetic layers are presented for the case of a structure with narrow-gap semiconducting IV-VI quantum wells. The main mechanism is a magnetic polarization of the size quantized electrons and holes inside the well. This type of interactions is suggested for the explanation of recent experiments on Eu/PbS structures. (author)

  16. High-efficient thermoelectric materials: The case of orthorhombic IV-VI compounds

    OpenAIRE

    Ding, Guangqian; Gao, Guoying; Yao, Kailun

    2015-01-01

    Improving the thermoelectric efficiency is one of the greatest challenges in materials science. The recent discovery of excellent thermoelectric performance in simple orthorhombic SnSe crystal offers new promise in this prospect [Zhao et al. Nature 508, 373 (2014)]. By calculating the thermoelectric properties of orthorhombic IV-VI compounds GeS,GeSe,SnS, and SnSe based on the first-principles combined with the Boltzmann transport theory, we show that the Seebeck coefficient, electrical condu...

  17. Determination of thermodynamic parameters of Cr(VI) adsorption from aqueous solution onto Agave lechuguilla biomass

    Energy Technology Data Exchange (ETDEWEB)

    Romero-Gonzalez, J. [Environmental Science and Engineering, University of Texas at El Paso, El Paso, TX 79968 (United States); Peralta-Videa, J.R. [Department of Chemistry, University of Texas at El Paso, El Paso, TX 79968 (United States); Rodriguez, E. [Environmental Science and Engineering, University of Texas at El Paso, El Paso, TX 79968 (United States); Ramirez, S.L. [Department of Chemistry, University of Texas at El Paso, El Paso, TX 79968 (United States); Gardea-Torresdey, J.L. [Environmental Science and Engineering, University of Texas at El Paso, El Paso, TX 79968 (United States) and Department of Chemistry, University of Texas at El Paso, El Paso, TX 79968 (United States)]. E-mail: jgardea@utep.edu

    2005-04-15

    The temperature dependence of the Cr(VI) bioadsorption and its possible reduction to Cr(III) by Agave lechuguilla biomass were studied. The experimental data obtained in batch experiments at different temperatures were fitted to the Langmuir and Freundlich isotherms to obtain the characteristic parameters of each model. The adsorption equilibrium data fitted well with the Freundlich model. The average model parameters calculated from Freundlich's isotherms (adsorption capacity K{sub F} = 4 . 10{sup -2} mol . g{sup -1} and an average adsorption intensity value n = 13.07) showed that A. lechuguilla can be considered as an effective biomaterial for Cr(VI) removal from aqueous solution. Thermodynamic parameters ({delta}G{sup .}, {delta}H{sup .}, and {delta}S{sup .}) for Cr(VI) adsorption determined in the temperature range from (283 to 313) K suggest that a portion of Cr(VI) may be bound to functional groups on the surface of the adsorbent and then reduced to Cr(III). Additionally, the parameters of the Dubinin-Radushkevick equation indicated that the sorption of chromium species onto lechuguilla biomass mainly proceeds through binding surface functional groups.

  18. The adsorption of U(VI) and Hg(II) on Paecilomyces catenlannulatus proteases

    International Nuclear Information System (INIS)

    The adsorption of U(VI) on Paecilomyces catenlannulatus as a function of agitation time, pH and solution concentration was investigated by batch techniques. Hg(II) cation was also employed to compare the adsorption capacity of P. catenlannulatus in this study. The adsorption kinetics indicate that the adsorption of U(VI) and Hg(II) on P. catenlannulatus can be fitted by pseudo-second kinetic model very well. The optimum pH for U(VI) removal was 7.0, whereas the high level of adsorption of Hg(II) was observed at pH >7.0 due to the occurrence of precipitate (i.e., Hg(OH)2(s)). The maximum adsorption capacity of P. catenlannulatus calculated from Langmuir model was 163.93 and 140.85 mg g-1 for U(VI) and Hg(II), respectively. This paper highlights the application of P. catenlannulatus as suitable bio-materials for the preconcentration and removal of radionuclides from aqueous solutions in environmental pollution management. (author)

  19. Determination of thermodynamic parameters of Cr(VI) adsorption from aqueous solution onto Agave lechuguilla biomass

    International Nuclear Information System (INIS)

    The temperature dependence of the Cr(VI) bioadsorption and its possible reduction to Cr(III) by Agave lechuguilla biomass were studied. The experimental data obtained in batch experiments at different temperatures were fitted to the Langmuir and Freundlich isotherms to obtain the characteristic parameters of each model. The adsorption equilibrium data fitted well with the Freundlich model. The average model parameters calculated from Freundlich's isotherms (adsorption capacity KF = 4 . 10-2 mol . g-1 and an average adsorption intensity value n = 13.07) showed that A. lechuguilla can be considered as an effective biomaterial for Cr(VI) removal from aqueous solution. Thermodynamic parameters (ΔG., ΔH., and ΔS.) for Cr(VI) adsorption determined in the temperature range from (283 to 313) K suggest that a portion of Cr(VI) may be bound to functional groups on the surface of the adsorbent and then reduced to Cr(III). Additionally, the parameters of the Dubinin-Radushkevick equation indicated that the sorption of chromium species onto lechuguilla biomass mainly proceeds through binding surface functional groups

  20. Energy levels and radiative rates for transitions in Ti VI

    CERN Document Server

    Aggarwal, KM; Msezane, AZ

    2013-01-01

    We report on calculations of energy levels, radiative rates, oscillator strengths, and line strengths for transitions among the lowest 253 levels of the (1s$^2$2s$^2$2p$^6$) 3s$^2$3p$^5$, 3s3p$^6$, 3s$^2$3p$^4$3d, 3s3p$^5$3d, 3s$^2$3p$^33d^2$, 3s$^2$3p$^4$4s, 3s$^2$3p$^4$4p and 3s$^2$3p$^4$4d configurations of Ti VI. The general-purpose relativistic atomic structure package ({\\sc grasp}) and flexible atomic code ({\\sc fac}) are adopted for the calculations. Radiative rates, oscillator strengths and line strengths are reported for all electric dipole (E1), magnetic dipole (M1), electric quadrupole (E2) and magnetic quadrupole (M2) transitions among the 253 levels, although calculations have been performed for a much larger number of levels. Comparisons are made with existing available results and the accuracy of the data is assessed. Additionally, lifetimes for all 253 levels are listed, although comparisons with other theoretical results are limited to only 88 levels. Our energy levels are estimated to be acc...

  1. Few-layer III-VI and IV-VI 2D semiconductor transistors

    Science.gov (United States)

    Sucharitakul, Sukrit; Liu, Mei; Kumar, Rajesh; Sankar, Raman; Chou, Fang C.; Chen, Yit-Tsong; Gao, Xuan

    Since the discovery of atomically thin graphene, a large variety of exfoliable 2D materials have been thoroughly explored for their exotic transport behavior and promises in technological breakthroughs. While most attention on 2D materials beyond graphene is focused on transition metal-dichalcogenides, relatively less attention is paid to layered III-VI and IV-VI semiconductors such as InSe, SnSe etc which bear stronger potential as 2D materials with high electron mobility or thermoelectric figure of merit. We will discuss our recent work on few-layer InSe 2D field effect transistors which exhibit carrier mobility approaching 1000 cm2/Vs and ON-OFF ratio exceeding 107 at room temperature. In addition, the fabrication and device performance of transistors made of mechanically exfoliated multilayer IV-VI semiconductor SnSe and SnSe2 will be discussed.

  2. Role of anions and reaction conditions in the preparation of uranium(VI), neptunium(VI), and plutonium(VI) borates.

    Science.gov (United States)

    Wang, Shuao; Villa, Eric M; Diwu, Juan; Alekseev, Evgeny V; Depmeier, Wulf; Albrecht-Schmitt, Thomas E

    2011-03-21

    U(VI), Np(VI), and Pu(VI) borates with the formula AnO(2)[B(8)O(11)(OH)(4)] (An = U, Np, Pu) have been prepared via the reactions of U(VI) nitrate, Np(VI) perchlorate, or Pu(IV) or Pu(VI) nitrate with molten boric acid. These compounds are all isotypic and consist of a linear actinyl(VI) cation, AnO(2)(2+), surrounded by BO(3) triangles and BO(4) tetrahedra to create an AnO(8) hexagonal bipyramidal environment. The actinyl bond lengths are consistent with actinide contraction across this series. The borate anions bridge between actinyl units to create sheets. Additional BO(3) triangles and BO(4) tetrahedra extend from the polyborate layers and connect these sheets together to form a three-dimensional chiral framework structure. UV-vis-NIR absorption and fluorescence spectroscopy confirms the hexavalent oxidation state in all three compounds. Bond-valence parameters are developed for Np(VI). PMID:21291194

  3. Nanostructure, thermoelectric properties, and transport theory of V{sub 2}VI{sub 3} and V{sub 2}VI{sub 3}/IV-VI based superlattices and nanomaterials

    Energy Technology Data Exchange (ETDEWEB)

    Dankwort, Torben; Schuermann, Ulrich; Kienle, Lorenz [Institute for Materials Science, Christian Albrechts University Kiel (Germany); Hansen, Anna-Lena; Bensch, Wolfgang [Institute for Inorganic Chemistry, Christian Albrechts University Kiel (Germany); Winkler, Markus; Koenig, Jan D. [Fraunhofer Institute for Physical Measurement Techniques IPM, Freiburg (Germany); Johnson, David C. [Department of Chemistry and Materials Science Institute, University of Oregon, Eugene, OR (United States); Hinsche, Nicki F. [Institute of Physics, Martin Luther University Halle-Wittenberg, Halle/Saale (Germany); Zahn, Peter [Helmholtz-Zentrum Dresden-Rossendorf e.V., Dresden (Germany); Mertig, Ingrid [Institute of Physics, Martin Luther University Halle-Wittenberg, Halle/Saale (Germany); Max Planck Institute of Microstructure Physics, Halle (Germany)

    2016-03-15

    The scope of this work is to review the thermoelectric properties, the microstructures, and their correlation with theoretical calculations and predictions for recent chalcogenide based materials. The main focus is put on thin multilayered Bi{sub 2}Te{sub 3}, Sb{sub 2}Te{sub 3} films, and bulk V{sub 2}VI{sub 3}/IV-VI mixed systems. For all films a systematic characterization of the thermoelectric properties as well as the micro- and nanostructure was performed. The degree of crystallinity of the multilayered films varied from epitaxial systems to polycrystalline films. Other multilayered thin films revealed promising thermoelectric properties. (SnSe){sub 1.2}TiSe{sub 2} thin films with rotational disorder yielded the highest Seebeck coefficient published to date for analogous materials. For bulk V{sub 2}VI{sub 3}/IV-VI mixed systems insides are given into a complete ''material to module'' process resulting in a high performance thermoelectric generator using (1-x)(GeTe) x(Bi{sub 2}Se{sub 0.2}Te{sub 2.8}) (x = 0.038). Cyclic heating of this system with x = 0.063 resulted in a drastic change of the micro- and nanostructure observed by ex situ and in situ X-ray diffraction (XRD) and transmission electron microscopy (TEM). Consequently a degradation of ZT at 450 C from ∝2.0 to ∝1.0 was observed, while samples with x = 0.038 showed a stable ZT of 1.5. (copyright 2016 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim)

  4. Evaluating Compliance with DOE-STD-3009-94 Appendix A Requirements

    International Nuclear Information System (INIS)

    Appendix A, Evaluation Guideline, is a newly-published guidance document to DOE-STD-3009-94, Preparation Guide for U.S. Department of Energy Nonreactor Nuclear Facility Safety Reports (January 2000). In addition to specifying a numerical radiological criterion to be used in the safety-class (SC) System, Structure, and Component (SSC) selection process for existing Department of Energy (DOE) facilities, Appendix A also describes methods and assumptions for calculating doses. Included are standardized dispersion specifications for quantifying doses to the site boundary from postulated accidental releases from the affected facility. While calculations of this nature must be performed at numerous DOE sites and for many facility types, few computer models rigorously comply with the requirements of Appendix A. Moreover, site-specific characteristics must be evaluated that take into account directional distance to the boundary, height of and the duration of the release

  5. Data summary report for fission product release test VI-6

    International Nuclear Information System (INIS)

    Test VI-6 was the sixth test in the VI series conducted in the vertical furnace. The fuel specimen was a 15.2-cm-long section of a fuel rod from the BR3 reactor in Belgium. The fuel had experienced a burnup of ∼42 MWd/kg, with inert gas release during irradiation of ∼2%. The fuel specimen was heated in an induction furnace at 2300 K for 60 min, initially in hydrogen, then in a steam atmosphere. The released fission products were collected in three sequentially operated collection trains designed to facilitate sampling and analysis. The fission product inventories in the fuel were measured directly by gamma-ray spectrometry, where possible, and were calculated by ORIGEN2. Integral releases were 75% for 85Kr, 67% for 129I, 64% for 125Sb, 80% for both 134Cs and 137Cs, 14% for 154Eu, 63% for Te, 32% for Ba, 13% for Mo, and 5.8% for Sr. Of the totals released from the fuel, 43% of the Cs, 32% of the Sb, and 98% of the Eu were deposited in the outlet end of the furnace. During the heatup in hydrogen, the Zircaloy cladding melted, ran down, and reacted with some of the UO2 and fission products, especially Te and Sb. The total mass released from the furnace to the collection system, including fission products, fuel, and structural materials, was 0.57 g, almost equally divided between thermal gradient tubes and filters. The release behaviors for the most volatile elements, Kr and Cs, were in good agreement with the ORNL Diffusion Model

  6. Data summary report for fission product release test VI-6

    Energy Technology Data Exchange (ETDEWEB)

    Osborne, M.F.; Lorenz, R.A.; Travis, J.R.; Webster, C.S.; Collins, J.L. [Oak Ridge National Lab., TN (United States)

    1994-03-01

    Test VI-6 was the sixth test in the VI series conducted in the vertical furnace. The fuel specimen was a 15.2-cm-long section of a fuel rod from the BR3 reactor in Belgium. The fuel had experienced a burnup of {approximately}42 MWd/kg, with inert gas release during irradiation of {approximately}2%. The fuel specimen was heated in an induction furnace at 2300 K for 60 min, initially in hydrogen, then in a steam atmosphere. The released fission products were collected in three sequentially operated collection trains designed to facilitate sampling and analysis. The fission product inventories in the fuel were measured directly by gamma-ray spectrometry, where possible, and were calculated by ORIGEN2. Integral releases were 75% for {sup 85}Kr, 67% for {sup 129}I, 64% for {sup 125}Sb, 80% for both {sup 134}Cs and {sup 137}Cs, 14% for {sup 154}Eu, 63% for Te, 32% for Ba, 13% for Mo, and 5.8% for Sr. Of the totals released from the fuel, 43% of the Cs, 32% of the Sb, and 98% of the Eu were deposited in the outlet end of the furnace. During the heatup in hydrogen, the Zircaloy cladding melted, ran down, and reacted with some of the UO{sub 2} and fission products, especially Te and Sb. The total mass released from the furnace to the collection system, including fission products, fuel, and structural materials, was 0.57 g, almost equally divided between thermal gradient tubes and filters. The release behaviors for the most volatile elements, Kr and Cs, were in good agreement with the ORNL Diffusion Model.

  7. Interactions between U(VI) and bovine serum albumin

    International Nuclear Information System (INIS)

    Interest in bio-toxicology of uranium resulting from its radioactive heavy metal property has been growing enormously in recent years. The interactions between uranium(VI) [U(VI)] and bovine serum albumin (BSA) at physiological pH were studied by spectroscopic methods. Fluorescence results revealed the formation of BSA-U(VI) complex, the binding constants as well as the number of binding sites were determined. In particular, the effects of U(VI) binding on the secondary structures of BSA were examined by means of Fourier transformation infrared spectroscopy equipped with attenuated total reflection (FT-IR/ATR). It was found that the α-helix component of BSA decreased gradually with increasing concentration of U(VI). In contrast, the β-sheets, turns, and random coil structures all increased correspondingly. Our work would shed light on the possible interaction mechanism between U(VI) and proteins in aqueous solutions. (author)

  8. Full-core pin-power calculations using Monte Carlo codes

    International Nuclear Information System (INIS)

    Pin wise calculations of core power distribution have been performed for a criticality mock up installation that models a WWER-1000 reactor. Two Monte Carlo codes have been applied for solving of this problem: the MCNP4B code and the KENO-VI code from the SCALE 4.4 system. The codes use different kinds of neutron cross section data: pointwise continuous-energy ENDF/B-VI data and multigroup ENDF/B-V data. Comparisons of calculated results show that the MCNP4B and KENO-VI results are in good agreement. (authors)

  9. Extraction of U(VI) and Th(IV) from nitric acid solutions with N,N,N',N'-tetrahexylsuccinylamide

    International Nuclear Information System (INIS)

    A new diamide N,N,N',N'-tetrahexylsuccinylamide (THSA) was synthesized, characterised and used for the extraction of U(V) and Th(IV) from nitric acid solutions in a diluent composed of 50% 1,2,4-trimethylbenzene (TMB) and 50% kerosene (OK). Extraction distribution coefficients of U(VI) and Th(IV) as a function of aqueous nitric acid concentration, extractant concentration and temperature have been studied. The composition of extracted species, equilibrium constants and enthalpies of extraction reactions have also been calculated. The IR spectra of saturated extraction of U(VI) and Th(IV) were recorded. (author)

  10. Enhanced Transport of U(Vi) and Th(IV) Through Cation Exchange Membrane Using Electric Field

    International Nuclear Information System (INIS)

    Transport of ionic species through ion exchange membrane found several applications for water effluents purification and metal ion separation. To enhance the transport performance, the effect of electric field was introduced in this work. The transport of U (Vi) and Th(IV) species in nitric acid solutions across cation exchange membrane was investigated. In this concern, different parameters affecting the transport were studied. These parameters include; nitric acid concentration in the feed solution, stripping solution concentration and applied electric field. From the results obtained the permeability coefficient of U(Vi) and Th(IV) were calculated. Based on these information, a process for separation of thorium from uranium is developed

  11. Effects of organophosphorus donors in the extraction of Uranium(VI) with N-acetyl benzamide in chloroform

    International Nuclear Information System (INIS)

    The liquid-liquid extraction of Uranium(VI) from aqueous nitrate solution by a mixture of N-acetyl benzamide and Organophosphorus donors in chloroform is reported. Concentration of the metal was measured by fluorescence technique and synergism was observed in the extraction of Uranium(VI). Stoichiometries of extracted species in both individual and mixed extraction were ascertained by slope ratio analysis. From the extraction data, overall equilibrium constants for binary and ternary extractions were calculated. Thermodynamic parameters controlling the nature of extraction were also evaluated. (author)

  12. MEMS Calculator

    Science.gov (United States)

    SRD 166 MEMS Calculator (Web, free access)   This MEMS Calculator determines the following thin film properties from data taken with an optical interferometer or comparable instrument: a) residual strain from fixed-fixed beams, b) strain gradient from cantilevers, c) step heights or thicknesses from step-height test structures, and d) in-plane lengths or deflections. Then, residual stress and stress gradient calculations can be made after an optical vibrometer or comparable instrument is used to obtain Young's modulus from resonating cantilevers or fixed-fixed beams. In addition, wafer bond strength is determined from micro-chevron test structures using a material test machine.

  13. Radiological findings in patients with mucopolysaccharidosis type VI

    International Nuclear Information System (INIS)

    The radiological findings in two siblings with mucopolysaccharidosis type VI (muco polysaccharide VI) are reported. Conventional radiographs of the skeleton and magnetic resonance imaging examination of the central nervous system were performed. Skeletal abnormalities in patients with mucopolysaccharidosis type VI have already well described by other authors and are generally similar to other mucopolysaccharides. Magnetic resonance imaging of the central nervous system may be helpful in the differential diagnosis, assessment of extension, and follow-up of these diseases. (author)

  14. Cr(VI) Generation and Stability in Drinking Water

    OpenAIRE

    Chittaladakorn, Kathita

    2014-01-01

    The current US Environmental Protection Agency (USEPA) maximum contaminant level (MCL) for total chromium of 100 ppb is under revision to consider a specific level for Cr(VI), which has a proposed MCL of 10 ppb in California. Cr(VI) is a suspected carcinogen, and interconverts with the other most commonly found chromium species, Cr(III). To regulate and further understand the behavior of Cr(VI) in water systems, appropriate sample preservation methods are essential for accurate measurements. ...

  15. Removal of chromium(VI) from saline wastewaters by

    OpenAIRE

    AKSU, Zümriye

    2002-01-01

    Some industrial wastewaters contain higher quantities of salts besides chromium(VI) ions so the effect of these salts on the biosorption of chromium(VI) should be investigated. The biosorption of chromium (VI) from saline solutions on two strains of living Dunaliella algae were tested under laboratory conditions as a function of pH, initial metal ion and salt (NaCl) concentrations in a batch system. The biosorption capacity of both Dunaliella strains strongly de...

  16. DBC solvent extraction of U(VI) from thiocyanate medium

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    The extraction behavior of uranium(VI) from thiocyanate medium with dibenzo-18-crown-6 (DBC) in nitrobenzene and the effects of alkali cations on the extraction were investigated. The results showed that the uranium (VI) can be effectively extracted in the presence of potassium cation, uranium (VI) is extracted as complex anionic species UO2(SCN)-3, and the stoichiometry of the extracted complex is KUO2(SCN)32DBC(o).

  17. Uranium(VI) diffusion in low-permeability subsurface materials

    International Nuclear Information System (INIS)

    Uranium(VI) diffusion was investigated in a fine-grained saprolite sediment that was collected from U.S. Department of Energy (DOE) Oak Ridge site, TN, where uranium contamination in groundwater is a major environmental concern. U(VI) diffusion was studied in a diffusion cell with one cell end in contact with a large, air-equilibrated electrolyte reservoir. The pH, carbonate and U(VI) concentrations in the reservoir solution were varied to investigate the effect of solution chemical composition and uranyl speciation on U(VI) diffusion. The rates of U(VI) diffusion were evaluated by monitoring the U(VI) concentration in the reservoir solution as a function of time; and by measuring the total concentration of U(VI) extracted from the sediment as a function of time and distance in the diffusion cells. The estimated apparent rate of U(VI) diffusion varied significantly with pH, with the slowest rate observed at pH 7 as a result of strong adsorptive retardation. The estimated retardation factor was generally consistent with a surface complexation model. Numerical simulations indicated that a species-based diffusion model that incorporated both aqueous and surface complexation reactions was required to describe U(VI) diffusion in the low permeability material under variable geochemical conditions. Our results implied that low permeability materials will play an important role in storing U(VI) and attenuating U(VI) plume migration at circumneutral pH conditions, and will serve as a long-term source for releasing U(VI) back to the nearby aquifer during and after aquifer decontamination. (orig.)

  18. Biosorption of uranium(VI) by free and entrapped Chlamydomonas reinhardtii. Kinetic, equilibrium and thermodynamic studies

    International Nuclear Information System (INIS)

    Biosorption of uranium from aqueous solution onto the free and entrapped algae, 'Chlamydomonas reinhardtii' in carboxymethyl cellulose (CMC) beads was investigated in a batch system using bare CMC beads as a control system. CMC can be a potential natural biosorbent for radionuclide removal as it contains carboxyl groups. However, limited information is available with the biosorption of uranium by CMC, when adsorption isotherm, kinetics and thermodynamics parameters are concerned. The biosorbent preparations were characterized by swelling tests, FTIR, and surface area studies. The effects of pH, temperature, ionic strength, biosorbent dosage, and initial uranium concentrations on uranium biosorption were investigated. Freely suspended algae exhibited the highest uranium uptake capacity with an initial uranium ion concentration of 1,000 mg/L at pH of 4.5 and at 25 deg C. The removal of U(VI) ion from the aqueous solution with all the tested biosorbents increased as the initial concentration of U(VI) ion increased in the medium. Maximum biosorption capacities for free algal cells, entrapped algal cells, and bare CMC beads were found to be 337.2, 196.8, and 153.4 mg U(VI)/g, respectively. The kinetic studies indicated that the biosorption of U(VI) ion was well described by the pseudo-second order kinetic model. The variations in enthalpy and entropy for the tested biosorbent were calculated from the experimental data. The algal cells entrapped beads were regenerated using 10 mM HNO3, with up to 94 % recovery. Algal cells entrapped CMC beads is a low cost and a potential composite biosorbent with high biosorption capacity for the removal of U(VI) from waters. (author)

  19. Enhanced removal of Cr(VI) from aqueous solutions using polypyrrole wrapped oxidized MWCNTs nanocomposites adsorbent.

    Science.gov (United States)

    Bhaumik, Madhumita; Agarwal, Shilpi; Gupta, Vinod Kumar; Maity, Arjun

    2016-05-15

    Polypyrrole wrapped oxidized multiwalled carbon nanotubes nanocomposites (PPy/OMWCNTs NCs) were prepared via in situ chemical polymerization of pyrrole (Py) monomer in the presence of OMWCNTs using FeCl3 as oxidant for the effective removal of hexavalent chromium [Cr(VI)]. The as-prepared PPy/OMWCNTs NCs were characterized by FE-SEM, HR-TEM, ATR-FTIR, XRD, XPS and BET method. Characterization results suggested that PPy was uniformly covered on the OMWCNTs surface and resulted in enhanced specific surface area. Adsorption experiments were carried out in batch sorption mode to investigate the effect of pH, dose of adsorbent, contact time, concentration of Cr(VI) and temperature. The adsorption of Cr(VI) on the nanocomposite surface was highly pH dependent and the kinetics of the adsorption followed the pseudo-second-order model. The adsorption isotherm data were in good conformity with the Langmuir isothermal model. The maximum adsorption capacity of the PPy/OMWCNTs NCs for Cr(VI) was 294mg/g at 25°C. The calculated values of the thermodynamic parameters such as ΔG(0) (-0.237kJ/mol), ΔH(0) (13.237kJ/mol) and ΔS(0) (0.0452kJ/mol/K) revealed that the adsorption process is spontaneous, endothermic and marked with an increase in randomness at the solid-liquid interface. The presence of co-existing ions slightly affected the Cr(VI) removal efficiency of the PPy/OMWCNTs. PMID:26962976

  20. Influence of mass measurements at FSR-ESR on r-process calculations. Report on the work performed under contract ''4500047689 / 23.09.2004'' in the frame of the HGF Virtual Institute VH VI-061 ''Struktur der Kerne und Astrophysik (VISTARS)''

    International Nuclear Information System (INIS)

    The aim of the study is to examine the influence of direct mass measurements performed at the FRS-ESR of the GSI on the calculations of isotopic abundances in the astrophysical r-process. In addition, persepectives for measurements with the future Facility for Antiproton and Ion Research FAIR are shown. (orig.)

  1. Phytoremediation potential and nutrient status of Barringtonia acutangula Gaerth. Tree seedlings grown under different chromium (CrVI) treatments.

    Science.gov (United States)

    Kumar, Dharmendra; Tripathi, Durgesh Kumar; Chauhan, Devendra Kumar

    2014-02-01

    To investigate the effect of different chromium (CrVI) treatments on seedlings of semi-aquatic plant Barringtonia acutangula, hydroponic experiments were conducted. Results revealed that B. acutangula could tolerate much higher CrVI concentration accumulated about 751-2,703 mg kg(-1) dry weight in roots and 50-1,101 mg kg(-1) dry weight in shoots, respectively, under 1.0, 2.0, 3.0, 4.0, and 5.0 mM chromium treatments. CrVI exposure at 1.0-4.0 mM does not exhibit toxicity signs; however, up to 4.0 mM CrVI exposure causes significant decline in growth parameters. Content of macronutrients such as Ca and K decreased under different Cr treatments in roots and shoots, while Mg content of roots and shoots did not influence at the range of 1.0-4.0 mM Cr; however, significant decrease at 5.0 mM Cr, besides P content, significantly shows increasing trends, respectively. Interestingly, sulfur content of roots and shoots show increasing trends at 1.0-2.0 mM Cr; however, severe decrease of up to 3.0-5.0 mM is shown in CrVI treatments. Furthermore, micronutrients content were enhanced under CrVI treatments excluding Cu and Fe since they show significant reduction in shoots as well as in roots. Bioaccumulation factor were also calculated on the basis of results obtained which shows the value of >1 without viewing chromium toxicity symptoms. This study demonstrated that B. acutangula could tolerate CrVI concentrations up to 1.0-4.0 mM Cr which may be useful in chromium phytoremediation programs. PMID:24399023

  2. Voltammetry of Os(VI)-modified polysaccharides

    Czech Academy of Sciences Publication Activity Database

    Trefulka, Mojmír; Paleček, Emil

    2010-01-01

    Roč. 22, č. 16 (2010), s. 1837-1845. ISSN 1040-0397 R&D Projects: GA AV ČR(CZ) GPP301/10/P548; GA MŠk(CZ) LC06035 Grant ostatní: GA AV ČR(CZ) KAN400310651 Institutional research plan: CEZ:AV0Z50040507; CEZ:AV0Z50040702 Keywords : chemical modification of polysaccharides * electroactive labels * osmium(VI) complexes Subject RIV: BO - Biophysics Impact factor: 2.721, year: 2010

  3. Reduction U(VI) using jones reductor

    International Nuclear Information System (INIS)

    Reduction of dissolved oxide uranium in sulfuric acid use of reductor Jones Zn (Hg) was carried out. The reduced uranium sulfate solution was analyzed its U(IV) by measuring its absorbance on 652 nm and compared to oxidation U(IV) solution with KMnO4 solution. It was found that the comparison was in a good agreement. However, measuring of absorbance of U(VI) solution on 429 nm result of oxidation U(IV) with KMnO4 solution was not change. (author)

  4. Farvel til globaliseringen som vi kendte den

    DEFF Research Database (Denmark)

    Böss, Michael

    2009-01-01

    Vi er endt med en krise, som rækker langt ud over det globale monetære system, fordi den ideologiske ortodoksi, der skabte den, har ført til udflytning af millioner af arbejdspladser, tæring af nationalstaternes sammenhængskraft og overgreb på naturen. Kronikken refererer bl.a. til John Maynard...... Keynes og en artikel af økonomen Robert Skidelsky i The American Prospect. Udgivelsesdato: 12. januar 2009...

  5. Environmental Survey in Region VI, Haltenbanken, 2009. Summary report; Miljoeundersoekelse i Region VI, Haltenbanken, 2009. Sammendragsrapport

    Energy Technology Data Exchange (ETDEWEB)

    Mannvik, Hans-Petter; Wasbotten, Ingar Halvorsen

    2010-07-01

    An environmental survey of Region VI, Haltenbanken, has been carried out. This report presents the results from the analyses carried out on samples from a total of 316 stations at 16 fields and 15 regional stations. A status of the environmental conditions in the region is given at the end of the report. (Author)

  6. Environmental survey of Region VI, Haltenbanken, 2009; Miljoeundersoekelse i Region VI, Haltenbanken, 2009

    Energy Technology Data Exchange (ETDEWEB)

    Holm, May-Helen; Cochrane, Sabine; Mannvik, Hans-Petter; Wasbotten, Ingar Halvorsen

    2010-07-01

    There has been an environmental investigation in Region VI Halten Bank. This report presents the results of the chemical and biological assays performed on samples from a total of 316 stations in 16 fields and 15 regional stations. A status of environmental conditions in the region is given at the end of the report. (AG)

  7. Total Reducing Capacity in Aquifer Minerals and Sediments: Quantifying the Potential to Attenuate Cr(VI) in Groundwater

    Energy Technology Data Exchange (ETDEWEB)

    Sisman, S. Lara [Univ. of Virginia, Charlottesville, VA (United States); Savannah River Site (SRS), Aiken, SC (United States). Savannah River National Lab. (SRNL)

    2015-07-20

    Hexavalent chromium, Cr(VI), is present in the environment as a byproduct of industrial processes. Due to its mobility and toxicity, it is crucial to attenuate or remove Cr(VI) from the environment. The objective of this investigation was to quantify potential natural attenuation, or reduction capacity, of reactive minerals and aquifer sediments. Samples of reduced-iron containing minerals such as ilmenite, as well as Puye Formation sediments representing a contaminated aquifer in New Mexico, were reacted with chromate. The change in Cr(VI) during the reaction was used to calculate reduction capacity. This study found that minerals that contain reduced iron, such as ilmenite, have high reducing capacities. The data indicated that sample history may impact reduction capacity tests due to surface passivation. Further, this investigation identified areas for future research including: a) refining the relationships between iron content, magnetic susceptibility and reduction capacity, and b) long term kinetic testing using fresh aquifer sediments.

  8. Surface complexation modeling of U(VI) sorption on TiO{sub 2} in the presence of fulvic acid

    Energy Technology Data Exchange (ETDEWEB)

    Ye, Yuanlv [Ministry of Environmental Protection, Beijing (China). Nuclear and Radiation Safety Center; Univ. Lanzhou (China). Radiochemistry Lab.; Qiao, Yahua; Wang, Liang; Liu, Fudong; Zhang, Chunming [Ministry of Environmental Protection, Beijing (China). Nuclear and Radiation Safety Center; Guo, Zhijun; Wu, Wangsuo [Univ. Lanzhou (China). Radiochemistry Lab.

    2016-05-01

    In this work, experiments and modeling for the interactions between uranyl ion and TiO{sub 2} in the presence of fulvic acid are presented. The results demonstrated that FA is strongly bound to TiO{sub 2}, and these molecules have a very large effect on the U(VI) sorption, and vice versa. The results also demonstrated that U(VI) sorption to TiO{sub 2} in the presence and absence of sorbed FA can be well predicted with the SCD model (surface and complex distribution). According to the model calculations, the nature of the interactions between FA with U(VI) at TiO{sub 2} surface is mainly surface complex and electrostatic potential.

  9. Total Reducing Capacity in Aquifer Minerals and Sediments: Quantifying the Potential to Attenuate Cr(VI) in Groundwater

    International Nuclear Information System (INIS)

    Hexavalent chromium, Cr(VI), is present in the environment as a byproduct of industrial processes. Due to its mobility and toxicity, it is crucial to attenuate or remove Cr(VI) from the environment. The objective of this investigation was to quantify potential natural attenuation, or reduction capacity, of reactive minerals and aquifer sediments. Samples of reduced-iron containing minerals such as ilmenite, as well as Puye Formation sediments representing a contaminated aquifer in New Mexico, were reacted with chromate. The change in Cr(VI) during the reaction was used to calculate reduction capacity. This study found that minerals that contain reduced iron, such as ilmenite, have high reducing capacities. The data indicated that sample history may impact reduction capacity tests due to surface passivation. Further, this investigation identified areas for future research including: a) refining the relationships between iron content, magnetic susceptibility and reduction capacity, and b) long term kinetic testing using fresh aquifer sediments.

  10. Comparison of {sup 235}U fission cross sections in JENDL-3.3 and ENDF/B-VI

    Energy Technology Data Exchange (ETDEWEB)

    Kawano, Toshihiko [Kyushu Univ., Fukuoka (Japan); Carlson, Allan D. [National Institute of Standards and Technology (United States); Matsunobu, Hiroyuki [Data Engineering, Inc., Fujisawa, Kanagawa (Japan); Nakagawa, Tsuneo; Shibata, Keiichi [Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Tokai Research Establishment; Talou, Patrick; Young, Philip G.; Chadwick, Mark B. [Los Alamos National Laboratory, Los Alamos, NM (United States)

    2002-01-01

    Comparisons of evaluated fission cross sections for {sup 235}U in JENDL-3.3 and ENDF/B-VI are carried out. The comparisons are made for both the differential and integral data. The fission cross sections as well as the fission ratios are compared with the experimental data in detail. Spectrum averaged cross sections are calculated and compared with the measurements. The employed spectra are the {sup 235}U prompt fission neutron spectrum, the {sup 252}Cf spontaneous fission neutron spectrum, and the neutron spectrum produced by a {sup 9}Be(d, xn) reaction. For {sup 235}U prompt fission neutron spectrum, the ENDF/B-VI evaluation reproduces experimental averaged cross sections. For {sup 252}Cf and {sup 9}Be(d, xn) neutron spectra, the JENDL-3.3 evaluation gives better results than ENDF/B-VI. (author)

  11. Chromium(VI) adsorption from aqueous solution onto Moroccan Al-pillared and cationic surfactant stevensite.

    Science.gov (United States)

    Benhammou, Abdelaziz; Yaacoubi, Abdelrani; Nibou, Lahbib; Tanouti, Boumediane

    2007-02-01

    Batch adsorption of the chromium(VI) onto Moroccan stevensite pillared by Keggin aluminium hydroxypolycation (Al-stevensite) and cationic surfactant cetyltrimethylammoniumbromide (CTA-stevensite) was investigated. The results showed that the CTA-stevensite has a higher affinity than that of Al-stevensite for chromium(VI) adsorption. The adsorption capacities for natural stevensite, Al-stevensite and CTA-stevensite calculated according to the Dubinin-Kaganer-Radushkevich isotherm (DKR) are 13.7, 75.4 and 195.6mmolkg(-1), respectively. The study of the pH effect showed that the optimal range corresponding to the Cr(VI) maximum adsorption on Al-stevensite is pH 3.5-6 and that on CTA-stevensite is pH 2-6. The adsorption rates evaluated according to the pseudo-second-order model are 7.2, 207.2 and 178.5mmolkg(-1)min(-1) for the natural stevensite, Al-stevensite and CTA-stevensite, respectively. The low values of the adsorption energy calculated by (DKR) suggest that anion exchange is the main mechanism that governs the chromate adsorption. PMID:16876943

  12. Liquid-liquid extraction of chromium (VI) from sulfuric acid solutions using tri-n-dodecylamine/kerosene

    International Nuclear Information System (INIS)

    Extraction of chromium (VI) from sulfuric acid solutions with tri-n-dodecylamine containing octanol-1 as a modifier in kerosene was investigated. All parameters influencing the extraction of chromium (VI) (time of agitation, concentrations of chromium (VI), sulfuric acid, tri-n-dodecylamine and temperature) were studied. Forst of all, tri-n-dodecylamine reacts with sulfuric acid to form tri-n-dodecylamine sulfate and bisulfate salts, then, dichromate ions is extracted by amine bisulfate. The mathematical treatment of the obtained date enabled us to calculate the formation of equilibrium constant of (TDAH)2SO4 TDAHHSO4 and (TDAH)2 Cγ2O7 at 25 Centigrade and have been found to be K1=109.642(14/mol4), K2= 10-0.899(L/mol) and Kex 1010.55 respectively. Stripping of more than 99% of chromium (VI) from the organic phase of tri-n-dodecylamine/kerosene can be easily achieved in two stages using 0.05 M sodium carbonate solution. The synergistic effect of tri-n-butylphosphate and tri-n-octylphosphine oxide on the extraction of chromium (VI) were also studied. (author)

  13. Extraction of U(VI) and Pu(VI) from HClO4 by HDEHP and synergism with TOPO

    International Nuclear Information System (INIS)

    The extraction behaviour of U(VI) and Pu(VI) by di-2-ethylhexylphosphoric acid (HDEHP) from perchloric acid was investigated. The actinide species were extracted as MO2(HY2)2, where HY-2 represents the anion of the dimeric HDEHP(H2Y2). Addition of tri-n-octylphosphine oxide (TOPO) to H2Y2 enhanced the extraction of both U(VI) and Pu(VI). This behaviour is attributed to the adduct MO2(HY2)2 . TOPO and due to the mixed complex MO2ClO4(HY2) . TOPO containing anion from the aqueous perchloric acid. (orig.)

  14. Biosorption of Cr (VI) ion from aqueous solution by maize husk: isothermal, kinetics and thermodynamic study

    International Nuclear Information System (INIS)

    The kinetics, equilibrium and thermodynamic of the biosorption of Cr (VI) ion onto maize husk biomass from aqueous solution were investigated. The effects of contact time, initial metal concentration, pH, temperature as well as modification with oxalic acid on biosorption capacity were studied. The maximum biosorption capacity of the untreated corn shaft biomass (UTCS) was found to be 28.49 mg g-1 which slightly increased to 29.33 mg g/sup -1/ when treated with oxalic acid treated corn shaft biomass (ATCS). The kinetics studies showed that the biosorption process of the metal ion fitted well with second order model. The calculated thermodynamic parameters (delta Go, delta Ho and delta S') showed that the biosorption of Cr (VI) ion onto the biomass maize husk is feasible, spontaneous and exothermic in nature. (author)

  15. The effect of temperature on the extraction of uranium (VI) and thorium (IV) from nitric Acid by Tri-n-Butyl phosphate

    International Nuclear Information System (INIS)

    Experimental studies have been carried out on the effect temperature on the extraction of U(VI) and Th(IV) from 3 molar nitric acid media by 20% tri-n-butyl phosphate (TBP) in kerosene, measured as a function of the metal concentration at 25, 45, and 65-+1degree. The results indicated that the extraction enthalpy of both the U(VI) and Th(IV) is exothermic. The distribution coefficients of both U(VI) and Th(IV) decreased with the increase in temperature. The data available made an effort to calculate the equilibrium constants, the Gibbs energy change and the entropy change of the extraction reaction. The obtained promising results can be used for designing and achieving extraction of both U(VI) and Th(IV) from radioactive waste solutions in the treatment process before disposal

  16. N,N,N',N'-tetrabutylsuccinylamide as a new extractant in n-dodecane for extraction of uranium(VI) and thorium(IV) ions

    International Nuclear Information System (INIS)

    N,N,N',N'-tetrabutylsuccinylamide (TBSA) was synthesized, characterised and used for the extraction of U(VI) and Th(IV) from nitric acid solutions into n-dodecane. Extraction distribution coefficients of U(VI) and Th(IV) as a function of aqueous nitric acid concentration, extractant concentration and temperature have been measured and found that n-dodecane as diluent was superior to 50% 1,2,4-trimethlyl benzene (TMB) and 50% kerosene (OK) system for extraction of U(VI) and Th(IV). The compositions of extracted species, equilibrium constants and enthalpies of extraction reactions have also been calculated. The formation of the 1:2:1 complex of uranyl(II) ion or the 1:4:1 complex of thorium(IV) ion, nitrate ion and TBSA and extracted species was further confirmed by the IR spectra of saturated extract of U(VI) and Th(IV). (author)

  17. Synthesis and characterization of N,N,N',N'-tetrabutylsuccinamide as extractant for uranium(VI) and thorium(IV) ions from nitric acid solution

    International Nuclear Information System (INIS)

    Synthesis and characterization of N,N,N',N'-tetrabutylsuccinamide (TBSA) was carried out and used for the extraction of U(VI) and Th(IV) from nitric acid solutions. Toluene was found to be the most suitable diluent for TBSA compared with the other diluents tested. Extraction distribution ratios (D) of U(VI) and Th(IV) have been studied as a function of aqueous HNO3 concentrations, NO3- ion concentration, TBSA concentration and temperature. The results obtained indicated that U(VI) and Th(IV) are mainly extracted as UO2(NO3)2 x 2TBSA and Th(NO3)4 x TBSA, respectively, and the IR spectra of the extracted species have been investigated. The values of thermodynamic functions have been calculated. Back-extraction of U(VI) and Th(IV) from organic phases was also studied. (author)

  18. Diagnostic and treatment strategies in mucopolysaccharidosis VI

    Directory of Open Access Journals (Sweden)

    Vairo F

    2015-10-01

    Full Text Available Filippo Vairo,1–3 Andressa Federhen,1,3,4 Guilherme Baldo,1,2,5–7 Mariluce Riegel,1,6 Maira Burin,1 Sandra Leistner-Segal,1,8 Roberto Giugliani1,5,6,81Medical Genetics Service, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil; 2Department of Genetics, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil; 3Clinical Research Group on Medical Genetics, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil; 4Post-Graduate Program in Child and Adolescent Health, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil; 5Gene Therapy Center, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil; 6Post-Graduate Program in Genetics and Molecular Biology, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil; 7Department of Physiology, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil; 8Post-Graduate Program in Medical Sciences, Universidade Federal do Rio Grande do Sul, Porto Alegre, BrazilAbstract: Mucopolysaccharidosis VI (MPS VI is a very rare autosomal recessive disorder caused by mutations in the ARSB gene, which lead to deficient activity of the lysosomal enzyme ASB. This enzyme is important for the breakdown of the glycosaminoglycans (GAGs dermatan sulfate and chondroitin sulfate, which accumulate in body tissues and organs of MPS VI patients. The storage of GAGs (especially dermatan sulfate causes bone dysplasia, joint restriction, organomegaly, heart disease, and corneal clouding, among several other problems, and reduced life span. Despite the fact that most cases are severe, there is a spectrum of severity and some cases are so attenuated that diagnosis is made late in life. Although the analysis of urinary GAGs and/or the measurement of enzyme activity in dried blood spots are useful screening methods, the diagnosis is based in the demonstration of the enzyme deficiency in leucocytes or fibroblasts, and/or in the identification of pathogenic mutations in the ARSB gene

  19. Reliability Calculations

    DEFF Research Database (Denmark)

    Petersen, Kurt Erling

    1986-01-01

    probabilistic approaches have been introduced in some cases for the calculation of the reliability of structures or components. A new computer program has been developed based upon numerical integration in several variables. In systems reliability Monte Carlo simulation programs are used especially in analysis...... of very complex systems. In order to increase the applicability of the programs variance reduction techniques can be applied to speed up the calculation process. Variance reduction techniques have been studied and procedures for implementation of importance sampling are suggested....

  20. Thermoelectric properties of IV–VI-based heterostructures and superlattices

    Energy Technology Data Exchange (ETDEWEB)

    Borges, P.D., E-mail: pabloborges@ufv.br [Instituto de Ciências Exatas e Tec., Universidade Federal de Viçosa, Rio Paranaíba, MG (Brazil); Department of Physics, Texas State University, San Marcos, TX 78666 (United States); Petersen, J.E.; Scolfaro, L. [Department of Physics, Texas State University, San Marcos, TX 78666 (United States); Leite Alves, H.W. [Departamento de Ciências Naturais, Universidade Federal de São João Del Rei, Caixa Postal 110, São João Del Rei 36300-000, MG (Brazil); Myers, T.H. [Department of Physics, Texas State University, San Marcos, TX 78666 (United States)

    2015-07-15

    Doping in a manner that introduces anisotropy in order to reduce thermal conductivity is a significant focus in thermoelectric research today. By solving the semiclassical Boltzmann transport equations in the constant scattering time (τ) approximation, in conjunction with ab initio electronic structure calculations, within Density Functional Theory, we compare the Seebeck coefficient (S) and figure of merit (ZT) of bulk PbTe to PbTe/SnTe/PbTe heterostructures and PbTe doping superlattices (SLs) with periodically doped planes. Bismuth and Thallium were used as the n- and p-type impurities, respectively. The effects of carrier concentration are considered via chemical potential variation in a rigid band approximation. The impurity bands near the Fermi level in the electronic structure of PbTe SLs are of Tl s- and Bi p-character, and this feature is independent of the doping concentration or the distance between impurity planes. We observe the impurity bands to have a metallic nature in the directions perpendicular to the doping planes, yet no improvement on the values of ZT is found when compared to bulk PbTe. For the PbTe/SnTe/PbTe heterostructures, the calculated S presents good agreement with recent experimental data, and an anisotropic behavior is observed for low carrier concentrations (n<10{sup 18} cm{sup −3}). A large value of ZT{sub ||} (parallel to the growth direction) of 3.0 is predicted for n=4.7×10{sup 18} cm{sup −3} and T=700 K, whereas ZT{sub p} (perpendicular to the growth direction) is found to peak at 1.5 for n=1.7×10{sup 17} cm{sup −3}. Both electrical conductivity enhancement and thermal conductivity reduction are analyzed. - Graphical abstract: Figure of merit for PbTe/SnTe/PbTe heterostructure along the [0 0 1] direction, P.D. Borges, J.E. Petersen, L. Scolfaro, H.W. Leite Alves, T.H. Myers, Improved thermoelectric properties of IV–VI-based heterostructures and superlattices. - Highlights: • Thermoelectric properties of IV–VI

  1. Procedure for plutonium determination using Pu(VI) spectra

    International Nuclear Information System (INIS)

    This document describes a simple spectrophotometric method for determining total plutonium in nitric acid solutions based on the spectrum of Pu(VI). Plutonium samples in nitric acid are oxidized to Pu(VI) with Ce(IV) and the net absorbance at the 830 nm peak is measured

  2. Extraction of uranium (VI) sulphate complexes by Adogen amines

    International Nuclear Information System (INIS)

    The distribution of U(VI) between aqueous H2 So4 solutions and organic phases of adogen-368 has been described. The dependence of extraction on acidity, diluent type, metal and extractant concentrations was investigated. The possible extraction mechanism is discussed in the light of results obtained. The separation of U(VI) from rare earths is suggested. 5 figs., 1 tab

  3. Type VI Collagen Regulates Dermal Matrix Assembly and Fibroblast Motility.

    Science.gov (United States)

    Theocharidis, Georgios; Drymoussi, Zoe; Kao, Alexander P; Barber, Asa H; Lee, David A; Braun, Kristin M; Connelly, John T

    2016-01-01

    Type VI collagen is a nonfibrillar collagen expressed in many connective tissues and implicated in extracellular matrix (ECM) organization. We hypothesized that type VI collagen regulates matrix assembly and cell function within the dermis of the skin. In the present study we examined the expression pattern of type VI collagen in normal and wounded skin and investigated its specific function in new matrix deposition by human dermal fibroblasts. Type VI collagen was expressed throughout the dermis of intact human skin, at the expanding margins of human keloid samples, and in the granulation tissue of newly deposited ECM in a mouse model of wound healing. Generation of cell-derived matrices (CDMs) by human dermal fibroblasts with stable knockdown of COL6A1 revealed that type VI collagen-deficient matrices were significantly thinner and contained more aligned, thicker, and widely spaced fibers than CDMs produced by normal fibroblasts. In addition, there was significantly less total collagen and sulfated proteoglycans present in the type VI collagen-depleted matrices. Normal fibroblasts cultured on de-cellularized CDMs lacking type VI collagen displayed increased cell spreading, migration speed, and persistence. Taken together, these findings indicate that type VI collagen is a key regulator of dermal matrix assembly, composition, and fibroblast behavior and may play an important role in wound healing and tissue regeneration. PMID:26763426

  4. 77 FR 64399 - Order of Succession for HUD Region VI

    Science.gov (United States)

    2012-10-19

    ... URBAN DEVELOPMENT Order of Succession for HUD Region VI AGENCY: Office of Field Policy and Management, HUD. ACTION: Notice of Order of Succession. SUMMARY: In this notice, the Assistant Deputy Secretary... Succession for the Fort Worth Regional Office and its Field Offices (Region VI). This Order of...

  5. Kandinsky's "Composition VI": Heideggerian Poetry in Noah's Ark

    Science.gov (United States)

    Hall, Joshua M.

    2012-01-01

    The author will begin his investigation of Wassily Kandinsky's painting "Composition VI" with Kandinsky's own commentary on the painting. He will then turn to the analysis of Kandinsky and the "Compositions" in John Sallis's book "Shades." Using this analysis as his point of departure, the author will consider how "Composition VI" resonates with…

  6. Comparison between measured and calculated neutron spectra in FCA assemblies

    International Nuclear Information System (INIS)

    The neutron spectra measured in FCA Assembly VI-2, VI-1 and V-2 are discussed, and are compared with the results by calculation. The data were obtained by measurements of proton-recoil counter and double scintillator methods. Calculations were made with cell-program SP-2000 and fine-group cross section library AGRI/2, and the spectra with 1950 groups and broadened 64 and 26 group were derived. The measured spectra in the energy range of 5 keV to 6 MeV were effectively compared with the calculational results, by using C/E values. There are large differences between the measured and the calculated spectra near the 430 keV oxygen and 29 keV iron resonances. The experimental and the calculated central fission rate ratios were also compared. (author)

  7. Biosorption of uranium (VI) by immobilized Aspergillus fumigatus beads

    International Nuclear Information System (INIS)

    Biosorption of uranium (VI) ions by immobilized Aspergillus fumigatus beads was investigated in a batch system. The influences of solution pH, biosorbent dose, U (VI) concentration, and contact time on U (VI) biosorption were studied. The results indicated that the adsorption capacity was strongly affected by the solution pH, the biosorbent dose and initial U (VI) concentration. Optimum biosorption was observed at pH 5.0, biosrobent dose (w/v) 2.5%, initial U (VI) concentration 60 mg L-1. Biosorption equilibrium was established in 120 min. The adsorption process conformed to the Freunlich and Temkin isothermal adsorption models. The dynamic adsorption model conformed to pseudo-second order model.

  8. Behaviour of chromium(VI) in stormwater soil infiltration systems

    DEFF Research Database (Denmark)

    Cederkvist, Karin; Ingvertsen, Simon T.; Jensen, Marina B.;

    2013-01-01

    mm in 2 h) and extreme (100 mm in 3 h) rain events. The objectives were to understand the behaviour of the anionic and toxic Cr(VI) in soil at neutral pH and to asses treatment efficiency towards Cr(VI). During normal rain events Cr(VI) was largely retained (more than 50, even though pH was neutral......, while under extreme rain events approximately 20% of Cr(VI) was retained. In both cases effluent concentrations of Cr(VI) would exceed the threshold value of 3.4 mu g/L if the infiltrated water were introduced to freshwater environments. More knowledge on the composition of the stormwater runoff, and...

  9. 40 CFR Appendix C to Part 66 - Computer Program

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 15 2010-07-01 2010-07-01 false Computer Program C Appendix C to Part...) ASSESSMENT AND COLLECTION OF NONCOMPLIANCE PENALTIES BY EPA Pt. 66, App. C Appendix C to Part 66—Computer Program Note: For text of appendix C see appendix C to part 67....

  10. SPEI Calculator

    OpenAIRE

    Beguería, Santiago; Vicente Serrano, Sergio M.

    2009-01-01

    [EN] *Objectives: The program calculates time series of the Standardised Precipitation-Evapotransporation Index (SPEI). *Technical Characteristics: The program is executed from the Windows console. From an input data file containing monthly time series of precipitation and mean temperature, plus the geographic coordinates of the observatory, the program computes the SPEI accumulated at the time interval specified by the user, and generates a new data file with the SPEI time serie...

  11. Burnout calculation

    International Nuclear Information System (INIS)

    Reviewed is the effect of heat flux of different system parameters on critical density in order to give an initial view on the value of several parameters. A thorough analysis of different equations is carried out to calculate burnout is steam-water flows in uniformly heated tubes, annular, and rectangular channels and rod bundles. Effect of heat flux density distribution and flux twisting on burnout and storage determination according to burnout are commended

  12. Schwannoma of the appendix: a case report

    International Nuclear Information System (INIS)

    Schwannoma is a benign neurogenic tumor arising from the nerve sheath, and it presents as a well defined mass. Isolated gastrointestinal schwannoma is a relatively rare finding and schwannoma of the appendix is extremely rare. We report here on a case of schwannoma that arose from the appendix, and this lesion was pathologically confirmed

  13. 31 CFR Appendixes to Chapter V - Note

    Science.gov (United States)

    2010-07-01

    ... 31 Money and Finance: Treasury 3 2010-07-01 2010-07-01 false Note Appendixes to Chapter V Money... CONTROL, DEPARTMENT OF THE TREASURY Ch. V, Nt. Appendixes to Chapter V—Note Notes: The alphabetical lists.... References to regulatory parts in chapter V or other authorities: : Western Balkans Stabilization...

  14. Alpha-benzoinoxime. Extracting agent for uranium(VI), tungsten(VI), molybdenum(VI) and some transition metals of the iron family

    International Nuclear Information System (INIS)

    The effect of pH on the percent extraction of vanadium(V), iron(II), cobalt(II), nickel(II), copper(II), molybdenum(VI), tungsten(VI) and uranium(VI) by α-benzoinoxime in different solvents has been studies. The maximum recovery is not appreciably affected by the nature of the solvent, but occurs at different pH values for different metals. The pH corresponding to maximum extraction increases with increasing hydrolysis pK of the species in aqueous solution, and decreases with increasing stability constant of the complexes formed. Alpha-benzoinoxime allows the separation of these metal ions into three groups: V(V), Mo(VI) and W(VI) are extracted at pH=2, U(VI) at pH=5, Fe(II), Cu(II), Co(II) and Ni(II) at around pH=10. (author) 13 refs.; 2 figs.; 1 tab

  15. Cranial nerves III, IV and VI

    International Nuclear Information System (INIS)

    Because of advances in CT and MR imaging, accurate identification and evaluation of cranial nerve lesions is now possible. Cranial nerves III, IV, and VI, providing motor and sensory control of the eye, can be evaluated as a unit. In this paper, the authors present an overview of the anatomy and pathology of these cranial nerves. We first illustrate their normal anatomic pathways from the brain stem to the orbit. This is followed by clinical examples of patients with a variety of isolated and complex palsies of these three cranial nerves. This is accomplished by inclusion of ocular photographs, correlative imaging studies, and the use of diagrams. Knowledge of the gross and imaging anatomy and the ophthalmologic manifestations of pathology affecting these three cranial nerves permits a tailored approach to their evaluation

  16. VI. Los Matusalenes de la Sierra

    OpenAIRE

    Ordinaire, Olivier

    2015-01-01

    *** Vi en Jauja algunos compatriotas que habían venido de Lima, o incluso de París, para curarse en ese valle de enfermedades del pecho; y debo decir que si bien no alabaron los atractivos del lugar, fueron unánimes en proclamar los efectos saludables de éste. En una palabra, preferían morir de aburrimiento en Jauja que de una tisis galopante en otra parte. Se cita al Perú como el país donde, en relación a la cifra de su población, hay más centenarios; y es en los valles altos de la Sierra do...

  17. Ion–Cyclotron Resonance Frequency Interval Dependence on the O VI Ion Number Density in the North Polar Coronal Hole 1.5–3 Region

    Indian Academy of Sciences (India)

    Özgür Gültekin; Emine Rızaoǧlu; K. Gediz Akdeniz

    2013-12-01

    The frequency intervals in which O VI ions get in resonance with ion–cyclotron waves are calculated using the kinetic model, for the latest six values found in literature on O VI ion number densities in the 1.5–3 region of the NPCH. It is found that the common resonance interval is 1.5 kHz to 3 kHz. The -variations of wave numbers necessary for the above calculations are evaluated numerically, solving the cubic dispersion relation with the dielectric response derived from the quasi-linear Vlasov equation for the left-circularly polarized ion-cyclotron waves.

  18. Six-fold Coordinated Carbon Dioxide VI

    Energy Technology Data Exchange (ETDEWEB)

    Iota, V; Yoo, C; Klepeis, J; Jenei, Z

    2006-03-01

    Under standard conditions, carbon dioxide (CO{sub 2}) is a simple molecular gas and an important atmospheric constituent while silicon dioxide (SiO{sub 2}) is a covalent solid, and represents one of the fundamental minerals of the planet. The remarkable dissimilarity between these two group IV oxides is diminished at higher pressures and temperatures as CO{sub 2} transforms to a series of solid phases, from simple molecular to a fully covalent extended-solid V, structurally analogous to SiO{sub 2} tridymite. Here, we present the discovery of a new extended-solid phase of carbon dioxide (CO{sub 2}): a six-fold coordinated stishovite-like phase VI, obtained by isothermal compression of associated CO{sub 2}-II above 50GPa at 530-650K. Together with the previously reported CO{sub 2}-V and a-carbonia, this new extended phase indicates a fundamental similarity between CO{sub 2}--a prototypical molecular solid, and SiO{sub 2}--one of Earth's fundamental building blocks. The phase diagram suggests a limited stability domain for molecular CO{sub 2}-I, and proposes that the conversion to extended-network solids above 40-50 GPa occurs via intermediate phases II, III, and IV. The crystal structure of phase VI suggests strong disorder along the caxis in stishovite-like P4{sub 2}/mnm, with carbon atoms manifesting an average six-fold coordination within the framework of sp{sup 3} hybridization.

  19. Six-fold coordinated carbon dioxide VI

    Energy Technology Data Exchange (ETDEWEB)

    Iota, Valentin; Yoo, Choong-Shik; Klepeis, Jae-Hyun; Jenei, Zsolt; Evans, William; Cynn, Hyunchae (LLNL)

    2008-06-16

    Under standard conditions, carbon dioxide (CO{sub 2}) is a simple molecular gas and an important atmospheric constituent, whereas silicon dioxide (SiO{sub 2}) is a covalent solid, and one of the fundamental minerals of the planet. The remarkable dissimilarity between these two group IV oxides is diminished at higher pressures and temperatures as CO{sub 2} transforms to a series of solid phases, from simple molecular to a fully covalent extended-solid V, structurally analogous to SiO{sub 2} tridymite. Here, we present the discovery of an extended-solid phase of CO{sub 2}: a six-fold coordinated stishovite-like phase VI, obtained by isothermal compression of associated CO{sub 2}-II above 50 GPa at 530-650 K. Together with the previously reported CO{sub 2}-V and a-carbonia, this extended phase indicates a fundamental similarity between CO{sub 2} (a prototypical molecular solid) and SiO{sub 2} (one of Earth's fundamental building blocks). We present a phase diagram with a limited stability domain for molecular CO{sub 2}-I, and suggest that the conversion to extended-network solids above 40-50 GPa occurs via intermediate phases II, III and IV. The crystal structure of phase VI suggests strong disorder along the c axis in stishovite-like P4{sub 2}/mnm, with carbon atoms manifesting an average six-fold coordination within the framework of sp{sup 3} hybridization.

  20. Six-fold coordinated carbon dioxide VI.

    Science.gov (United States)

    Iota, Valentin; Yoo, Choong-Shik; Klepeis, Jae-Hyun; Jenei, Zsolt; Evans, William; Cynn, Hyunchae

    2007-01-01

    Under standard conditions, carbon dioxide (CO2) is a simple molecular gas and an important atmospheric constituent, whereas silicon dioxide (SiO2) is a covalent solid, and one of the fundamental minerals of the planet. The remarkable dissimilarity between these two group IV oxides is diminished at higher pressures and temperatures as CO2 transforms to a series of solid phases, from simple molecular to a fully covalent extended-solid V, structurally analogous to SiO2 tridymite. Here, we present the discovery of an extended-solid phase of CO2: a six-fold coordinated stishovite-like phase VI, obtained by isothermal compression of associated CO2-II (refs 1,2) above 50 GPa at 530-650 K. Together with the previously reported CO2-V (refs 3-5) and a-carbonia, this extended phase indicates a fundamental similarity between CO2 (a prototypical molecular solid) and SiO2 (one of Earth's fundamental building blocks). We present a phase diagram with a limited stability domain for molecular CO2-I, and suggest that the conversion to extended-network solids above 40-50 GPa occurs via intermediate phases II (refs 1,2), III (refs 7,8) and IV (refs 9,10). The crystal structure of phase VI suggests strong disorder along the c axis in stishovite-like P42/mnm, with carbon atoms manifesting an average six-fold coordination within the framework of sp3 hybridization. PMID:17160005

  1. REVISED AND EXTENDED ANALYSIS OF FIVE TIMES IONIZED XENON, Xe VI

    Energy Technology Data Exchange (ETDEWEB)

    Gallardo, M.; Raineri, M.; Reyna Almandos, J. [Centro de Investigaciones Opticas (CIOp), CC 3, 1897, Gonnet, La Plata (Argentina); Pagan, C. J. B.; Abrahão, R. A., E-mail: monicar@ciop.unlp.edu.ar, E-mail: cesarpagan@fee.unicamp.br [School of Electrical and Computer Engineering, University of Campinas (UNICAMP), 13083-852, Campinas, SP (Brazil)

    2015-01-01

    A capillary discharge tube was used to record the Xe spectrum in the 400-5500 Å  region. A set of 243 lines of the Xe VI spectrum was observed, and 146 of them were classified for the first time. For all known lines, we calculated the weighted oscillator strengths (gf) and weighted transition probabilities (gA) using the configuration interaction in a relativistic Hartree-Fock approach. The energy matrix was calculated using energy parameters adjusted to fit the experimental energy levels. Core polarization effects were taken into account in our calculations. Experimental energy values and calculated lifetimes are also presented for a set of 88 levels. From these levels, 32 were classified for the first time and 33 had their values revised. Our analysis of the 5s5p5d and 5s5p6s configurations was extended in order to clarify discrepancies among previous works.

  2. The reduction of Np(VI) and Pu(VI) by organic chelating agents

    International Nuclear Information System (INIS)

    The reduction of NpO2+ and PuO22+ by oxalate. citrate, and ethylenediaminetetraacetic acid (EDTA) was investigated in low ionic strength media and brines. This was done to help establish the stability of the An(VI) oxidation state in the presence of organic complexants. The stability of the An(VI) oxidation state depended on the pH and relative strength of the various oxidation state-specific complexes. At low ionic strength and pH 6, NpO2O2+ was rapidly reduced to form NpO2+ organic complexes. At longer times, Np(IV) organic complexes were observed in the presence of citrate. PuO22+ was predominantly reduced to Pu4+, resulting in the formation of organic complexes or polymeric/hydrolytic precipitates. The relative rates of reduction to the An(V) complex were EDTA > citrate > oxalate. Subsequent reduction to An(IV) complexes, however, occurred in the following order: citrate > EDTA > oxalate because of the stability of the An(V)-EDTA complex. The presence of organic complexants led to the rapid reduction of NpO22+ and PuO2P2+ in G-seep brine at pHs 5 and 7. At pHs 8 and 10 in ERDA-6 brine, carbonate and hydrolytic complexes predominated and slowed down or prevented the reduction of An(VI) by the organics present

  3. Surface catalysis of uranium(VI) reduction by iron(II)

    Science.gov (United States)

    Liger, Emmanuelle; Charlet, Laurent; Van Cappellen, Philippe

    1999-10-01

    Colloidal hematite (α-Fe2O3) is used as model solid to investigate the kinetic effect of specific adsorption interactions on the chemical reduction of uranyl (UVIO22+) by ferrous iron. Acid-base titrations and Fe(II) and uranyl adsorption experiments are performed on hematite suspensions, under O2- and CO2-free conditions. The results are explained in terms of a constant capacitance surface complexation model of the hematite-aqueous solution interface. Two distinct Fe(II) surface complexes are required to reproduce the data: (≡FeIIIOFeII)+ (or ≡FeIIIOFeII(OH2)n+) and ≡FeIIIOFeIIOH0 (or ≡FeIIIOFeII(OH2)n-1OH0). The latter complex represents a significant fraction of total adsorbed Fe(II) at pH > 6.5. Uranyl binding to the hematite particles is characterized by a sharp adsorption edge between pH 4 and pH 5.5. Because of the absence of competing aqueous carbonate complexes, uranyl remains completely adsorbed at pH > 7. A single mononuclear surface complex accounts for the adsorption of uranyl over the entire range of experimental conditions. Although thermodynamically feasible, no reaction between uranyl and Fe(II) is observed in homogeneous solution at pH 7.5, for periods of up to three days. In hematite suspensions, however, surface-bound uranyl reacts on a time scale of hours. Based on Fourier Transformed Infrared spectra, chemical reduction of U(VI) is inferred to be the mechanism responsible for the disappearance of uranyl. The kinetics of uranyl reduction are quantified by measuring the decrease with time of the concentration of U(VI) extractable from the hematite particles by NaHCO3. In the presence of excess Fe(II), the initial rate of U(VI) reduction exhibits a first-order dependence on the concentration of adsorbed uranyl. The pseudo-first-order rate constant varies with pH (range, 6-7.5) and the total (dissolved + adsorbed) concentration of Fe(II) (range, 2-160 μM). When analyzing the rate data in terms of the calculated surface speciation, the

  4. Speedup and fracturing of George VI Ice Shelf, Antarctic Peninsula

    Directory of Open Access Journals (Sweden)

    T. O. Holt

    2013-05-01

    Full Text Available George VI Ice Shelf (GVIIS is located on the Antarctic Peninsula, a region where several ice shelves have undergone rapid breakup in response to atmospheric and oceanic warming. We use a combination of optical (Landsat, radar (ERS 1/2 SAR and laser altimetry (GLAS datasets to examine the response of GVIIS to environmental change and to offer an assessment on its future stability. The spatial and structural changes of GVIIS (ca. 1973 to ca. 2010 are mapped and surface velocities are calculated at different time periods (InSAR and optical feature tracking from 1989 to 2009 to document changes in the ice shelf's flow regime. Surface elevation changes are recorded between 2003 and 2008 using repeat track ICESat acquisitions. We note an increase in fracture extent and distribution at the south ice front, ice-shelf acceleration towards both the north and south ice fronts and spatially varied negative surface elevation change throughout, with greater variations observed towards the central and southern regions of the ice shelf. We propose that whilst GVIIS is in no imminent danger of collapse, it is vulnerable to ongoing atmospheric and oceanic warming and is more susceptible to breakup along its southern margin in ice preconditioned for further retreat.

  5. II-VI wide band gap semiconductors under hydrostatic pressure

    International Nuclear Information System (INIS)

    We set an analytical expression for the gap as a function of hydrostatic deformation, Eg(ε), by diagonalizing in Γ the corresponding Empirical Tight-binding Hamiltonian (ETBH). In our ETBH we use the well known d-2 Harrison Scaling Law (HSL) to adjust the TB parameter (TBP) to the changes in interatomic distances. We do not consider cation-anion charge transfer. We calculate Eg(ε) for wide band gap II-VI semiconductors with zincblende crystal structure for deformations under pressure up to -5%. Our results are in quite good agreement with experiment for the compounds of lower ionicity but deviate as the ionicity of the compound increases. This is due to the neglect of charge transfer which should be included self-consistently as done, for example, by Bertho et al. starting from an Empirical Tight-binding description of the bands similar as the one presented here. They sometimes get nevertheless a negative second derivative of Eg(ε) with respect to ε which is never gotten in the experiments. Within our approximation we always find a positive sing independently of the material. It seems that the procedure in which self-consistency is achieved is the source of this wrong sign. Furthermore, the inclusion of deviations from HSL appear to be unimportant to this problem. (author). 15 refs, 4 figs, 2 tabs

  6. Selective removal of Cr(VI) from aqueous solution by polypyrrole/2,5-diaminobenzene sulfonic acid composite.

    Science.gov (United States)

    Kera, Nazia H; Bhaumik, Madhumita; Ballav, Niladri; Pillay, Kriveshini; Ray, Suprakas Sinha; Maity, Arjun

    2016-08-15

    A polypyrrole/2,5-diaminobenzenesulfonic acid (PPy/DABSA) composite, synthesised by the in situ oxidative polymerization of pyrrole in the presence of DABSA, was studied as an adsorbent for the removal of Cr(VI) from aqueous solution. The structure and morphology of the composite were investigated by ATR-FTIR, FE-SEM, EDX, TGA, XRD and XPS studies. The adsorption of Cr(VI) by PPy/DABSA composite was highly pH dependent and optimum removal was achieved at pH 2. Adsorption of Cr(VI) was confirmed by EDX and XPS studies. The isotherm data fitted the linear Langmuir model well, with a maximum adsorption capacity of 303mg/g at 25°C. Thermodynamic parameters (ΔG°, ΔH° and ΔS°) were calculated using isotherm data and confirmed that the adsorption process was spontaneous and endothermic. Adsorption kinetics was best described by the pseudo-second-order model. The activation energy of the adsorption process suggested that Cr(VI) was chemisorbed by PPy/DABSA composite. PPy/DABSA composite could be used for three consecutive adsorption-desorption cycles without loss of its original adsorption capacity. Highly selective removal of Cr(VI) was observed even when co-existing ions such as Cu(2+), Zn(2+), Ni(2+), Cl(-), SO4(2)(-) and NO3(-) were present in the solution. In summary, the potential of PPy/DABSA composite for remediating industrial wastewater contaminated by Cr(VI) has been demonstrated. PMID:27209399

  7. Neptunium (VI) and neptunium (VI/V) mixed valence cluster compounds

    Energy Technology Data Exchange (ETDEWEB)

    May, Iain [Los Alamos National Laboratory

    2008-01-01

    Neptunium has three readily accessible oxidation states, IV, V and VI, which can coexist under certain conditions, with the aqueous soluble neptunyl(V) moiety, {l_brace}NpO{sub 2}{r_brace}{sup +}, of most environmental relevance. Careful control of Np chemistry is required during actinide separation processes. In addition, the long half life of the major alpha emitting isotope ({sup 237}Np, t{sub 1/2} = 2.144 x 10{sup 6} years) renders Np a major contributor to the radiotoxicity of nuclear waste as a function of time. Significant quantities of neptunium are generated in nuclear reactors and the current surge in interest in nuclear power will lead to an increase in our need to further understand the chemistry of this element. It is clearly of importance that Np chemistry is well understood and there have been several recent investigations into the structural, spectroscopic and magnetic properties of Np compounds. However, the vast majority of this chemistry has been performed in aqueous solution, prohibiting the use of air and moisture sensitive ligands. This is in stark contrast to uranium and thorium where inert atmosphere chemistry with moisture sensitive donor ligands has flourished, yielding greater insight into the structural and electronic properties of these early actinides. For the uranyl(VI) moiety, {l_brace}UO{sub 2}{r_brace}{sup 2+}, UO{sub 2}Cl{sub 2}(thf){sub 3} (and the desolvated dimer [UO{sub 2}Cl{sub 2}(thf)]{sub 2}) have proven to be excellent moisture-free reagents for inert atmosphere uranyl chemistry. These starting reagents have been used extensively within our group to study soft donor ligand coordination in the uranyl equatorial plane and oxo-activation to Lewis acid coordination. However, until now the absence of such a starting reagent for Np has limited our ability to extend this chemistry any further across the actinide series, which is required if we are to gain a more complete understanding of 5f element chemistry. The synthesis of [Np

  8. Cr(VI) reduction in aqueous solutions by siderite.

    Science.gov (United States)

    Erdem, Mehmet; Gür, Faruk; Tümen, Fikret

    2004-09-10

    Hexavalent chromium is a common and toxic pollutant in soils and wastewaters. Reduction of the mobile Cr(VI) to less mobile and less toxic Cr(III) is a solution for decontamination of industrial effluents. In this study, the reduction of hexavalent chromium in aqueous solutions by siderite was investigated. The influences of amount of acid, contact time, siderite dosage, initial Cr(VI) concentration, temperature and particle size of siderite have been tested in batch runs. The process was found to be acid, temperature and concentration dependent. The amount of acid is the most effective parameter affecting the Cr(VI) reduction since carbonaceous gangue minerals consume acid by side reactions. The highest Cr(VI) reduction efficiency (100%) occurred in the 50 mg/l Cr(VI) solution containing two times acid with respect to stoichiometric amount of Cr(VI) and at the conditions of siderite dosage 20 g/l, contact time 120 min and temperature 25 degrees C. Reduction efficiency increased with increase in temperature and decrease in particle size. The reduction capacity of siderite was found to be 17 mg-Cr(VI)/g. PMID:15363534

  9. Calculator calculus

    CERN Document Server

    McCarty, George

    1982-01-01

    How THIS BOOK DIFFERS This book is about the calculus. What distinguishes it, however, from other books is that it uses the pocket calculator to illustrate the theory. A computation that requires hours of labor when done by hand with tables is quite inappropriate as an example or exercise in a beginning calculus course. But that same computation can become a delicate illustration of the theory when the student does it in seconds on his calculator. t Furthermore, the student's own personal involvement and easy accomplishment give hi~ reassurance and en­ couragement. The machine is like a microscope, and its magnification is a hundred millionfold. We shall be interested in limits, and no stage of numerical approximation proves anything about the limit. However, the derivative of fex) = 67.SgX, for instance, acquires real meaning when a student first appreciates its values as numbers, as limits of 10 100 1000 t A quick example is 1.1 , 1.01 , 1.001 , •••• Another example is t = 0.1, 0.01, in the functio...

  10. Reliability calculations

    International Nuclear Information System (INIS)

    Risk and reliability analysis is increasingly being used in evaluations of plant safety and plant reliability. The analysis can be performed either during the design process or during the operation time, with the purpose to improve the safety or the reliability. Due to plant complexity and safety and availability requirements, sophisticated tools, which are flexible and efficient, are needed. Such tools have been developed in the last 20 years and they have to be continuously refined to meet the growing requirements. Two different areas of application were analysed. In structural reliability probabilistic approaches have been introduced in some cases for the calculation of the reliability of structures or components. A new computer program has been developed based upon numerical integration in several variables. In systems reliability Monte Carlo simulation programs are used especially in analysis of very complex systems. In order to increase the applicability of the programs variance reduction techniques can be applied to speed up the calculation process. Variance reduction techniques have been studied and procedures for implementation of importance sampling are suggested. (author)

  11. Wavelengths and energy levels of I V and I VI

    International Nuclear Information System (INIS)

    The spectra of iodine were photographed in the 139--1500-Aat;O region on various spectrographs. Earlier analyses of I V and I VI were revised and extended. For I V 26 lines were classified, and for I VI 35 lines were classified. Ionization energies have been estimated to be 415 510 atm≅ 300 cm-1 (51.52 atm≅ 0.04 eV) and 599 800 atm≅ 3 000 cm-1 (74.37 atm≅ 0.37 eV) for I V and I VI, respectively

  12. Synthesis and Structural Studies of 1-Deoxybaccatin VI Derivatives

    Institute of Scientific and Technical Information of China (English)

    LIN,Hai-Xia; WANG,Dian-Long; CHEN,Jian-Min; CHEN,Min-Qin

    2008-01-01

    Synthesis and crystal structures of 1-deoxybaccatin VI derivatives, and the influence of C(9), C(10), and C(13) substituents of the tetracyclic moiety on molecular conformations were investigated. Comparison of conformations of 1-deoxybaccatin VI derivatives reveals subtle conformational variations in the tetracyclic ring system due to deacetylation at C(10) and C(13), and 9,10-acetonide. Additionally, C(2)-benzoyl group exhibits an unexpected conformational flexibility in 1-deoxybaccatin VI derivatives, which may be relevant to the bioactivity of taxanes.

  13. The mechanism study of trace Cr(VI) removal from water using Fe{sup 0} nanorods modified with chitosan in porous anodic alumina

    Energy Technology Data Exchange (ETDEWEB)

    Sun, Li, E-mail: sunli@wtu.edu.cn [School of Mechanical Engineering and Automation, Wuhan Textile University, Wuhan 430073 (China); Yuan, Zhigang, E-mail: zgyuan@mail.ustc.edu.cn [School of Mechanical Engineering and Automation, Wuhan Textile University, Wuhan 430073 (China); Gong, Wenbang [School of Mechanical Engineering and Automation, Wuhan Textile University, Wuhan 430073 (China); Zhang, Lide [Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031 (China); Xu, Zili; Su, Gongbing; Han, Donggui [School of Mechanical Engineering and Automation, Wuhan Textile University, Wuhan 430073 (China)

    2015-02-15

    Highlights: • PAA can limit the size, disperse Fe{sup 0} nanorods and protect them from oxidation. • PAA and chitosan act as bridges between Fe{sup 0} and Cr(VI) by the surface charges. • The adsorption capacity calculated (118.76 mg g{sup −1}) agreed with the measured one. • Trace Cr(VI) removal was a spontaneous adsorption reduction process. - Abstract: Fe{sup 0} nanorods modified with chitosan in porous anodic alumina (PAA) were prepared as adsorbent. Adsorption of trace Cr(VI) onto adsorbent was tested as a function of solution pH value, initial Cr(VI) concentration and adsorption time. The results showed that PAA can limit the size, disperse Fe{sup 0} nanorods and protect them from oxidation. In the adsorption process, it was found that both PAA and chitosan can supply bridges between Fe{sup 0} nanorods and Cr(VI) through the surface electrostatic attraction, and a small amount of PAA was etched. The optimum adsorption capacity obtained from the Langmuir model is 118.76 mg g{sup −1} which agrees with the experimental value at pH 5.0. X-ray photoelectron spectroscopy revealed that Cr(VI) was reduced to Cr(III) on the adsorbent surface. The adsorption behavior of Cr(VI) onto adsorbent was fitted well with the Langmuir model. The adsorption process followed the pseudo-second-order kinetic model, which implied that the adsorption process was chemisorptions. Intraparticle diffusion study shows that the internal diffusion of adsorbent is not the sole rate-controlling step. The Gibbs free energy change (ΔG° < 0) indicated that the process of Cr(VI) onto adsorbent was spontaneous. Besides, the aluminum sheets could be regenerated and be anodized to produce PAA.

  14. Cinética e equilíbrio de adsorção dos oxiânions Cr (VI, Mo (VI e Se (VI pelo sal de amônio quaternário de quitosana Kinetics and equilibrium of adsorption of oxyanions Cr (VI, Mo (VI and Se (VI by quaternary ammonium chitosan salt

    Directory of Open Access Journals (Sweden)

    Viviane A. Spinelli

    2005-07-01

    Full Text Available O sal quaternário de quitosana foi sintetizado com cloreto de glicidil trimetil amônio. A modificação química foi caracterizada por espectrometria no IV, RMN de 13C e ¹H, e mmol/g de grupos quaternários presentes na matriz polimérica por condutimetria. A remoção de Cr (VI, Mo (VI e Se (VI, em meio aquoso, foi investigada em processo de batelada. A adsorção mostrou ser dependente do pH para o Cr (VI e Se (VI, com um pH ótimo de adsorção, entre 4,0 a 6,0. Para o Mo (VI a adsorção manteve-se quase constante no intervalo de pH entre 4,0 e 11,5. O modelo de isoterma de Langmuir descreveu melhor os dados de equilíbrio na faixa de concentração investigada. No presente estudo, um grama do sal quaternário de quitosana reticulado com glutaraldeído adsorveu 68,3 mg de Cr, 63,4 mg de Mo e 90,0 mg de Se. A velocidade de adsorção, no processo, segue a equação cinética de pseudo segunda-ordem, sendo que o equilíbrio para os três íons foi alcançado próximo aos 200 minutos. A análise dispersiva de raios-X para o Cr (VI mostrou que o principal mecanismo de adsorção é a troca iônica entre os íons Cl- da superfície do polímero pelos oxiânions. O trocador aniônico apresentou a seguinte ordem de seletividade: Cr (VI > Mo (VI > Se (VI.Quaternary chitosan salt was synthesized in the presence of glycidyl trimetyl ammonium chloride. The polymer was characterized by spectroscopic techniques: infrared, 13C and ¹H NMR, while the amount of quaternary ammonium groups was obtained by condutimetry. The removal of Cr (VI, Mo (VI and Se (VI from aqueous solutions was carried out in batch adsorption processes. The process seemed to be pH dependent for Cr (VI and Se (VI with an optimum pH ranging from 4.0 to 6.0; while for Mo (VI the adsorption remained almost constant within the range between 4.0 and 11.5. The Langmuir isotherm model provided the best fit of the equilibrium data over the whole concentration investigated. In the experiment

  15. Update of WIMS-D libraries using JENDL-3.2, ENDF/B-VI.5 and JEF-2.2

    International Nuclear Information System (INIS)

    The WIMS-D5 Libraries based on JENDL-3.2, ENDF/B-VI.5, and JEF-2.2 have been prepared and are being tested against the benchmark problems. Several sensitivity calculations for stabililty confirmation of the libraries were carried out such as the fission spectrum dependency, the self shielding effects of the elastic scattering cross sections, the self shielding effects of Pu -240 and Pu -242 capture cross sections below 4.0 eV, etc. The results of benchmark calculations with the libraries based on JENDL-3.2, ENDF/B-VI.5, JEF-2.2, and the '1986 library were intercompared. The predictions of criticalities and isotopic compositions with the updated libraries show good agreements with the measurements or the reference results. The multiplication factors with the library based on JENDL-3.2 are slightly higher than those of ENDF/B-VI.5 and JEF-2.2

  16. Thermoelectric conversion efficiency in IV-VI semiconductors with reduced thermal conductivity

    Directory of Open Access Journals (Sweden)

    Akihiro Ishida

    2015-10-01

    Full Text Available Mid-temperature thermoelectric conversion efficiencies of the IV-VI materials were calculated under the Boltzmann transport theory of carriers, taking the Seebeck, Peltier, and Thomson effects into account. The conversion efficiency was discussed with respect to the lattice thermal conductivity, keeping other parameters such as Seebeck coefficient and electrical conductivity to the same values. If room temperature lattice thermal conductivity is decreased up to 0.5W/mK, the conversion efficiency of a PbS based material becomes as high as 15% with the temperature difference of 500K between 800K and 300K.

  17. Theoretical Prediction of Topological Insulators in Thallium-based III-V-VI$_2$ Ternary Chalcogenides

    OpenAIRE

    Yan, Binghai; Liu, Chao-Xing; Zhang, Hai-Jun; Yam, Chi-Yung; Qi, Xiao-Liang; Frauenheim, Thomas; Zhang, Shou-Cheng

    2010-01-01

    We predict a new class of three dimensional topological insulators in thallium-based III-V-VI$_2$ ternary chalcogenides, including TlBiQ$_2$ and TlSbQ$_2$ (Q = Te, Se and S). These topological insulators have robust and simple surface states consisting of a single Dirac cone at the $\\Gamma$ point. The mechanism for topological insulating behavior is elucidated using both first principle calculations and effective field theory models. Remarkably, one topological insulator in this class, TlBiTe...

  18. Deformation potentials of some II-VI semiconductors at K=O states

    International Nuclear Information System (INIS)

    We present a tight-binding calculation of the deformation potentials for three II-VI compounds: CdTe, ZnTe and HgTe by very simple strain modifications of nondiagonal tight-binding parameters and compare them with experimental values. The agreement is good for both kinds of deformation potentials: the hydrostatic one which depends on the nondiagonal matrix elements and the uniaxial one which is mainly a measure of the diagonal interactions and thus depend directly on the tight-binding parameters used. (author). 18 refs, 1 fig., 2 tabs

  19. Polarographic study of dioxo-uranium(VI)-8-hydroxyquinoline-succinate system and thermodynamic parameters

    International Nuclear Information System (INIS)

    The dioxo-uranium(VI)-8-hydroxyquinoline-succinate system has been studied polarographically at constant ionic strength (μ = 0.6 M KCl) in aqueous alcohol (7:3) at different temperatures. The reduction of the simple and mixed complexes is reversible and diffusion controlled. The DeFord-Hume and Schaap-McMaster methods have been applied in the determination of composition and stability constants of the simple and mixed complexes respectively. The thermodynamic parameters ΔG, ΔH and ΔS have also been calculated. (author)

  20. Detached-eddy simulation of flow around the NREL phase VI blade

    DEFF Research Database (Denmark)

    Johansen, Jeppe; Sørensen, Niels N.; Michelsen, J.A.;

    2002-01-01

    The detached-eddy simulation model implemented in the computational fluid dynamics code EllipSys3D is used to calculate the flow around the non-rotating NREL Phase VI wind turbine blade. Results are presented for flow around a parked blade at fixed angle of attack and a blade pitching along......-eddy simulation show considerably more three-dimensional flow structures compared to conventional two-equation Reynolds-averaged Navier–Stokes turbulence models, but no particular improvements are seen in the global blade characteristics. Copyright © 2002 John Wiley & Sons, Ltd....

  1. Analysis of the PROTEUS reaction rate experiments with the ENDF/B-VI library

    International Nuclear Information System (INIS)

    The analysis of the PROTEUS Core 1 reaction rates with ENDF/B-VI show that there have been good progress concerning plutonium isotopes nuclear data (mainly Pu 239). In addition to that, there has been an excellent agreement of the parameter C8 which demonstrate the good quality of the U-238 (n, γ) nuclear data as well as the methodology used in this work. The analysis of the two-rod heterogeneity factor indicates the necessity of the introduction of the calculational methodologies which treats the geometric aspect exactly as MCNP. (author). 15 refs, 2 figs, 5 tabs

  2. Semiempirical construction of LCAO parameters for II-VI compound semiconductors

    International Nuclear Information System (INIS)

    A set of semiempirical expressions for the two-center integrals which show the explicit dependence of these quantities on the atomic characteristics, on the dielectric constant, on the ionicity of the solid, and also on the interatomic separations is constructed for the II-VI compound semiconductors. The Slater-Koster parameters are then constructed from these expressions for the two-center integrals. The band structures of various zinc and cadmium compounds are obtained and are compared with other theoretical calculations and with experimental photoemission results. (author)

  3. Modeling of Structure, Thermodynamic Properties and Phase Transition Temperaturesof II-VI Crystals

    Directory of Open Access Journals (Sweden)

    T.O. Parashchuk

    2016-06-01

    Full Text Available The work is devoted to the theoretical calculations and experimental study of important thermodynamic parameters of II-VI crystals. Cubic sphalerite and hexagonal wurtzite cluster models of polymorphs for stoichiometric II-VI crystals (ZnX, CdX; X = S, Se, Te have been proposed. In the work one carried out the calculations of thermodynamic parameters under normal conditions and defined the analytical expressions of temperature dependences for energy ΔE, enthalpy ΔH, Gibbs free energy ΔG, entropy ΔS for sphalerite phase stoichiometric crystals of zinc and cadmium chalcogenides. Using the results of DFT-calculations according to equality of Gibbs free energy for sphalerite and wurtzite phases (ΔGS = ΔGW of zinc chalcogenides crystals we defined phase transition "sphalerite-wurtzite" temperatures, which decreased in the line ZnS (1454 K – ZnSe (1427 K – ZnTe (1382 K and was found the specified region of stability for these polymorphs.

  4. Validation of KENO V.a using ENDF/B-VI and ENDF/B-VII for criticality safety applications

    International Nuclear Information System (INIS)

    An upper subcritical limit (USL), which includes allowance for bias and bias uncertainty in the calculated keff, needs to be established for all criticality safety code calculations. In this paper, the bias and bias uncertainty associated with keff values computed using KENO V.a are evaluated based on benchmark experiments for 235U, 233U, 239Pu and MOX systems. The code validation is performed using the 238-group ENDF/B-VI and ENDF/B-VII cross-section libraries provided in the SCALE code package. The evaluation suggests that the ENDF/B-VII library performs better than the ENDF/B-VI, with biases less than 2 mk for most systems. (author)

  5. A modelling exercise on the importance of ternary alkaline earth carbonate species of uranium(VI) in the inorganic speciation of natural waters

    International Nuclear Information System (INIS)

    Highlights: • The U(VI) speciation in natural waters has been modelled through a modelling exercise. • The results evidence the importance of alkaline earth U(VI) carbonate complexes. • Possible solubility-controlling phases were reported and discussed. • The differences were related to the choice and reliability of thermodynamic data. • Databases need to be improved for reliable U(VI) speciation calculations. - Abstract: Predictive modelling of uranium speciation in natural waters can be achieved using equilibrium thermodynamic data and adequate speciation software. The reliability of such calculations is highly dependent on the equilibrium reactions that are considered as entry data, and the values chosen for the equilibrium constants. The working group “Speciation” of the CETAMA (Analytical methods establishment committee of the French Atomic Energy commission, CEA) has organized a modelling exercise, including four participants, in order to compare modellers’ selections of data and test thermodynamic data bases regarding the calculation of U(VI) inorganic speciation. Six different compositions of model waters were chosen so that to check the importance of ternary alkaline earth carbonate species of U(VI) on the aqueous speciation, and the possible uranium solid phases as solubility-limiting phases. The comparison of the results from the participants suggests (i) that it would be highly valuable for end-users to review thermodynamic constants of ternary carbonate species of U(VI) in a consistent way and implement them in available speciation data bases, and (ii) stresses the necessary care when using data bases to avoid biases and possible erroneous calculations

  6. Appendix resonances on a simple graph

    International Nuclear Information System (INIS)

    We study the scattering problem on a graph consisting of a line with a finite-length appendix. The two parts are coupled through boundary conditions depending on three parameters; the motion on the line is free while the appendix supports a potential. The appendix bound states give rise to a ladder of resonances; we construct the resolvent and solve the corresponding pole condition for a weak coupling. In general, the condition only admits an analytic solution in particular cases. We find the pole positions numerically for a linear potential and show that the poles eventually return to the real axis when the coupling strength increases. (author)

  7. BIOSORPTION OF CR (VI BY RESTING CELLS OF ASPERGILLUS SP.

    Directory of Open Access Journals (Sweden)

    M. Sen , M. Ghosh Dastidar

    2007-01-01

    Full Text Available Biosorption of Cr(VI from aqueous solution was studied in a batch bioreactor using the resting cells of filamentous fungal biomass (Aspergillus sp. isolated from industrial wastewaters. The specific Cr(VI removal (mg/g of dried biomass decreased with increase in pH and increased with increase in initial Cr(VI concentration, upto 500 mg/L. By increasing biomass concentration from 2.4 to 5.2 g/L, the specific metal removal remained almost constant. The studies carried out by using the resting cells from various stages of growth indicated maximum Cr(VI removal of 34.8 mg/g using the biomass from the beginning of the stationary phase. The adsorption equilibrium constants Qº (42.9 mg/g and b (0.0091/mg were obtained from the Langmuir adsorption isotherm model.

  8. Mechanism of uranium (VI) removal by two anaerobic bacterial communities

    Energy Technology Data Exchange (ETDEWEB)

    Martins, Monica [Centro de Ciencias do Mar, Universidade do Algarve, FCT-DQF (edificio 8), Campus de Gambelas, 8005-139 Faro (Portugal); Faleiro, Maria Leonor [IBB - Centro de Biomedicina Molecular e Estrutural, Universidade do Algarve, FCT, Campus de Gambelas, 8005-139 Faro (Portugal); Costa, Ana M. Rosa da [Centro de Investigacao em Quimica do Algarve, Universidade do Algarve, FCT, DQF, Campus de Gambelas, 8005-139 Faro (Portugal); Chaves, Sandra; Tenreiro, Rogerio [Universidade de Lisboa, Faculdade de Ciencias, Centro de Biodiversidade, Genomica Integrativa e Funcional (BioFIG), Campus de FCUL, Campo Grande, 1749-016 Lisboa (Portugal); Matos, Antonio Pedro [Servico de Anatomia Patologica, Hospital Curry Cabral, Lisboa (Portugal); Costa, Maria Clara, E-mail: mcorada@ualg.pt [Centro de Ciencias do Mar, Universidade do Algarve, FCT-DQF (edificio 8), Campus de Gambelas, 8005-139 Faro (Portugal)

    2010-12-15

    The mechanism of uranium (VI) removal by two anaerobic bacterial consortia, recovered from an uncontaminated site (consortium A) and other from an uranium mine (consortium U), was investigated. The highest efficiency of U (VI) removal by both consortia (97%) occurred at room temperature and at pH 7.2. Furthermore, it was found that U (VI) removal by consortium A occurred by enzymatic reduction and bioaccumulation, while the enzymatic process was the only mechanism involved in metal removal by consortium U. FTIR analysis suggested that after U (VI) reduction, U (IV) could be bound to carboxyl, phosphate and amide groups of bacterial cells. Phylogenetic analysis of 16S rRNA showed that community A was mainly composed by bacteria closely related to Sporotalea genus and Rhodocyclaceae family, while community U was mainly composed by bacteria related to Clostridium genus and Rhodocyclaceae family.

  9. Thermodynamical analysis of the fission product release in the ORNL VI-3 and VI-5 tests; Analyse thermodynamique du relachement des produits de fission dans les essais ORNL VI-3 et VI-5

    Energy Technology Data Exchange (ETDEWEB)

    Defoort, J.; Froment, K

    1998-06-01

    The thermodynamical equilibrium hypothesis has been applied to the tests ORNL (Oak Ridge National Laboratory) VI-3 and VI-5 (Vertical Induction heated), to study fission release products. Irradiated fuel samples were heated under oxidizing (VI-3) and reducing (VI-5) controlled atmosphere. They can be compared to the Vercors 4 and 5 tests. The thermodynamical calculus results of barium and ruthenium fission products release, agree in the lump with measures, whatever the gas phase nature. The strontium release calculus under reducing atmosphere, is largely upper than those measured and correctly evaluated under oxidizing atmosphere. These results confirm those obtained for Vercors 4 and 5 and show the interest of the select model. (A.L.B.)

  10. ALTERATION OF U(VI)-PHASES UNDER OXIDIZING CONDITIONS

    Energy Technology Data Exchange (ETDEWEB)

    A.P. Deditius; S. Utsunomiya; R.C. Ewing

    2006-02-21

    Uranium-(VI) phases are the primary alteration products of the UO{sub 2} in spent nuclear fuel and the UO{sub 2+x}, in natural uranium deposits. The U(VI)-phases generally form sheet structures of edge-sharing UO{sub 2}{sup 2+} polyhedra. The complexity of these structures offers numerous possibilities for coupled-substitutions of trace metals and radionuclides. The incorporation of radionuclides into U(VI)-structures provides a potential barrier to their release and transport in a geologic repository that experiences oxidizing conditions. In this study, we have used natural samples of UO{sub 2+x}, to study the U(VI)-phases that form during alteration and to determine the fate of the associated trace elements.

  11. Mechanism of uranium (VI) removal by two anaerobic bacterial communities

    International Nuclear Information System (INIS)

    The mechanism of uranium (VI) removal by two anaerobic bacterial consortia, recovered from an uncontaminated site (consortium A) and other from an uranium mine (consortium U), was investigated. The highest efficiency of U (VI) removal by both consortia (97%) occurred at room temperature and at pH 7.2. Furthermore, it was found that U (VI) removal by consortium A occurred by enzymatic reduction and bioaccumulation, while the enzymatic process was the only mechanism involved in metal removal by consortium U. FTIR analysis suggested that after U (VI) reduction, U (IV) could be bound to carboxyl, phosphate and amide groups of bacterial cells. Phylogenetic analysis of 16S rRNA showed that community A was mainly composed by bacteria closely related to Sporotalea genus and Rhodocyclaceae family, while community U was mainly composed by bacteria related to Clostridium genus and Rhodocyclaceae family.

  12. Extraction behavior of uranium(VI) with polyurethane foam

    International Nuclear Information System (INIS)

    The extraction of uranium(VI) from aqueous solution with polyether-based polyurethane (PU) foam was studied. The effects of the kinds and concentrations of nitrate salts, uranium(VI) concentration, temperature, nitric acid concentration, pH, the content of poly(ethylene oxide) in the polyurethane foam, and the ratio of PU foam weight and solution volume on the extraction of uranium(VI) were investigated. The interferences of fluoride and carbonate ions on the extraction of uranium(VI) were also examined, and methods to overcome both interferences were suggested. It was found that no uranium was extracted in the absence of a nitrate salting-out agent, and the extraction behaviors of uranium(IV) with polyurethane foam could be explained in terms of an etherlike solvent extraction mechanism. In addition, the percentage extraction of a multiple stage was also estimated theoretically

  13. Sorption of uranium(VI) onto schwertmannite - EXAFS investigations

    International Nuclear Information System (INIS)

    In acid mine drainage conditions uranium(VI) adsorbs on goethite and schwertmannite, forming surface complexes with the ferric iron polyhedra and sulfate, respectively. The structure of these surface species was identified by EXAFS. (orig.)

  14. Polarography of uranium(VI)-salicylic acid system

    International Nuclear Information System (INIS)

    Uranium(VI)-salicylic acid system has been studied polarographically in perchloric acid medium. Varying concentrations of HClO4 and salicylic acid have been used. The nature of the polarographic waves is irreversible. (author)

  15. 40 CFR 75.83 - Calculation of Hg mass emissions and heat input rate.

    Science.gov (United States)

    2010-07-01

    ... heat input rate. 75.83 Section 75.83 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY... Calculation of Hg mass emissions and heat input rate. The owner or operator shall calculate Hg mass emissions and heat input rate in accordance with the procedures in sections 9.1 through 9.3 of appendix F...

  16. Vi behøver innovation

    DEFF Research Database (Denmark)

    McAloone, Tim C.

    2007-01-01

    . Især hvad angår vores forbrugsmønstre. Her er der behov for at kongeriget Danmark med sine 13 ton CO2-emission pr. person om året lytter. I landet hvor kraftvarmeproduk­tion, vindturbiner og industrial ecology i form af Kalundborg eksperimentet blev født, bør vi ikke også ride på denne nye miljøbølge......? Den amerikanske videnskabsmand Jeremy Rifkin beskriver i sin seneste bog, The European Dream, hvordan europæisk energipolitik, -forskning, -udvikling og relateret industri kan hjælpe os til at bremse vores for øjeblikket eksponentielt stigende CO2-produktion - og hvordan vores globaliseringstankegang...... rent faktisk kan fremme denne indsats. Den eneste udfordring er, at nogen skal igangsætte en økonomisk/industriel revolution, for at drømmen går i opfyldelse. Hvem skal tage ansvar for at sætte denne revolution i gang, og hvordan skal den opnås? Rifkin's patentløsning er inspirerende. Den er kort...

  17. Biosorption of Chromium (VI) from Aqueous Solutions onto Fungal Biomass

    OpenAIRE

    Ismael Acosta R.; Xöchitl Rodríguez; Conrado Gutiérrez; Ma. de Guadalupe Moctezuma

    2004-01-01

    The biosorption of chromium (VI) on eighteen different natural biosorbents: Natural sediment, chitosan, chitin, Aspergillus flavus I-V, Aspergillus fumigatus I-ll, Helmintosporium sp, Cladosporium sp, Mucor rouxii mutant, M. rouxii IM-80, Mucor sp-I and 2, Candida albicans and Cryptococcus neoformans was studied in this work. It was found that the biomass of C. neoformans, natural sediment, Helmintosporium sp and chitosan was more efficient to remove chromium (VI) (determined spectrophotometr...

  18. Plan of propagation and communication experiments using ETS-VI

    Science.gov (United States)

    Ohmori, Shingo

    1988-01-01

    In 1992, an Engineering Test Satellite VI is scheduled to be launched by an H-II rocket. The missions of ETS-VI are to establish basic technologies of inter-satellite communications using millimeter waves and optical beams and fix satellite communications using multibeam antenna on board the satellite. Several kinds of frequency bands will be used for the communications missions. However, these frequencies can be used for propagation experiments.

  19. Green Chemical Synthesis of II-VI Semiconductor Quantum Dots

    OpenAIRE

    Shahid, Robina

    2012-01-01

    Nanotechnology is the science and technology of manipulating materials at atomic and molecular scale with properties different from bulk. Semiconductor QDs are important class of nanomaterials with unique physical and chemical properties owing to the quantum confinement effect. Size dependent optical properties make research on semiconductor QDs more attractive in the field of nanotechnology. Semiconductor QDs are usually composed of combination of elements from groups II–VI, III–V, or IV–VI ...

  20. Robotics Vision for a Scouting Rover - PRoViScout

    Science.gov (United States)

    Paar, G.; Woods, M.; Pullan, D.; Proviscout Team

    2011-10-01

    The FP7-SPACE Project ProViScout (Planetary Robotics Vision Scout, scheduled from April 2010 to September 2012) aims to demonstrate the feasibility of vision-based autonomous sample identification & selection in combination with vision-based navigation for a long range scouting/exploration mission on a terrestrial planet along with the robotic elements required. The paper gives an overview of the PRoViScout technical and scientific objectives, envisaged solutions and achievements so far.

  1. Mucopolysaccharidosis VI (Case Report) Brain MRI and MR Spectroscopy Findings

    OpenAIRE

    Fuldem Donmez

    2013-01-01

    Mucopolysaccharidosis VI or Maroteaux-Lamy syndrome is an autosomal recessive lysosomal storage disorder with multisystem involvement which is determined by mutations in the arylsulfatase B (ARSB) gene. Herein, we report the radiological findings of a case of Mucopolysaccharidosis VI which showed progression of periventricular lesions on follow-up magnetic resonance imaging (MRI) and slight elevation of myoinositole and no other significant pathological peak on magnetic resonance (MR) spectro...

  2. Development and Application of MCNP5 and KENO-VI Monte Carlo Models for the Atucha-2 PHWR Analysis

    OpenAIRE

    O. Mazzantini; F. D'Auria; M. Pecchia; Parisi, C

    2011-01-01

    The geometrical complexity and the peculiarities of Atucha-2 PHWR require the adoption of advanced Monte Carlo codes for performing realistic neutronic simulations. Core models of Atucha-2 PHWR were developed using both MCNP5 and KENO-VI codes. The developed models were applied for calculating reactor criticality states at beginning of life, reactor cell constants, and control rods volumes. The last two applications were relevant for performing successive three dimensional neutron kinetic ana...

  3. Neutronic parameters characterization of the TRIGA IPR-R1 using scale 6.0 (KENO VI)

    International Nuclear Information System (INIS)

    KENO-VI is a Monte Carlo based transport code used to obtain the criticality of a nuclear system. A model built using this code in the SCALE6.0 software system was developed for the characterization of neutronic parameters of the IPR-R1 TRIGA research reactor. A comparison with experimental values and those calculated with a MCNP code model could be then attained with the purpose to validate this methodology. (author)

  4. A novel modified graphene oxide/chitosan composite used as an adsorbent for Cr(VI) in aqueous solutions.

    Science.gov (United States)

    Zhang, Li; Luo, Hanjin; Liu, Peipei; Fang, Wei; Geng, Junjie

    2016-06-01

    A novel adsorbent for removal of hexavalent chromium (Cr(VI)) from aqueous solutions has been successfully prepared by modifying graphene oxide/chitosan composite with disodium ethylenediaminetetraacetate (EDTA-2Na) (GEC). This modified composite was characterized by various technologies; including scanning electron microscopy (SEM), Transmission Electron Microscopy (TEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). Batch adsorption experiments were carried out to evaluate the adsorption of Cr(VI) by GEC under different conditions. The results indicate that the adsorption of Cr(VI) on GEC was highly pH-dependent, with the highest adsorption capacity (86.17mg/g) occurring at pH 2. The kinetics of adsorption exhibited pseudo-second-order behavior. The adsorption data were well described by the Freundlich isotherm model. The adsorption capacity increased with increasing temperature. The calculated thermodynamic parameters indicate that the adsorption is a spontaneous, endothermic and feasible process. The further regeneration experiments showed the adsorption capacity of GEC for Cr(VI) decreased 5% after 7 times reuse, indicating the potential of the as-prepared material for practical application. PMID:26993532

  5. Error analysis of equilibrium studies for the almond shell activated carbon adsorption of Cr(VI) from aqueous solutions

    International Nuclear Information System (INIS)

    In this study, the preparation of activated carbon from almond shell with H2SO4 activation and its ability to remove toxic hexavalent chromium from aqueous solutions are reported. The influences of several operating parameters such as pH, particle size and temperature on the adsorption capacity were investigated. Adsorption of Cr(VI) is found to be highly pH, particle size and temperature dependent. Four adsorption isotherm models namely, Langmuir, Freundlich, Tempkin and Dubinin-Radushkevich were used to analyze the equilibrium data. The Langmuir isotherm provided the best correlation for Cr(VI) onto the almond shell activated carbon (ASC). Adsorption capacity was calculated from the Langmuir isotherm as 190.3 mg/g at 323 K. Thermodynamic parameters were evaluated and the adsorption was endothermic showing monolayer adsorption of Cr(VI). Five error functions were used to treat the equilibrium data using non-linear optimization techniques for evaluating the fit of the isotherm equations. The highest correlation for the isotherm equations in this system was obtained for the Freundlich isotherm. ASC is found to be inexpensive and effective adsorbent for removal of Cr(VI) from aqueous solutions

  6. Removal of Cr(VI) from aqueous solutions by low-cost biosorbents: Marine macroalgae and agricultural by-products

    Energy Technology Data Exchange (ETDEWEB)

    Wang Xuesong [Department of Chemical Engineering, Huaihai Institute of Technology, Lianyungang, Jiangsu 222005 (China)], E-mail: snowpine1969@yahoo.com.cn; Li Zhizhong [Department of Chemical Engineering, Huaihai Institute of Technology, Lianyungang, Jiangsu 222005 (China); Sun Cheng [School of the Environment, Nanjing University, Nanjing, Jiangsu 210093 (China)

    2008-05-30

    In this study, adsorption of Cr(VI) onto the four low-cost biosorbents (Laminaria japonica, P. yezoensis Ueda, rice bran and wheat bran) was investigated depending on solution pH, contact time, adsorbent concentration and adsorption isotherms by employing batch adsorption technique. The adsorption capacities were significantly influenced by solution pH, with lower pH favoring higher Cr(VI) removal for various biosorbents. The ionic strength of NaCl was also observed to have a significant impact on the Cr(VI) adsorption due to the competition of Cl{sup -} in the aqueous solutions. The batch equilibrium data were correlated to Langmuir and Freundlich isotherms and the data fitted better to the Freundlich isotherm equation. The apparent thermodynamic parameters were calculated for each of the four biosorbents and the obtained numerical values showed that the Cr(VI) adsorption onto the various low-cost biosorbents is spontaneous, entropy-driven and endothermic processes. The batch kinetic data were correlated to the pseudo-first order and pseudo-second order models and the data fitted better to the pseudo-second order equation. An intraparticle diffusion model was applied to investigate the adsorption mechanisms. The adsorption capacities for various biosorbents studied in this work were inversely proportional to the adsorbent concentrations.

  7. Rooftop Unit Comparison Calculator User Manual

    Energy Technology Data Exchange (ETDEWEB)

    Miller, James D. [Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

    2015-04-30

    This document serves as a user manual for the Packaged rooftop air conditioners and heat pump units comparison calculator (RTUCC) and is an aggregation of the calculator’s website documentation. Content ranges from new-user guide material like the “Quick Start” to the more technical/algorithmic descriptions of the “Methods Pages.” There is also a section listing all the context-help topics that support the features on the “Controls” page. The appendix has a discussion of the EnergyPlus runs that supported the development of the building-response models.

  8. Vi har intet lært - hvornår lærer vi det?

    DEFF Research Database (Denmark)

    Sodemann, Morten

    2016-01-01

    WHO anså fra i går ikke længere ebola for at være en trussel mod global folkesundhed, så fra i dag er kameraerne slukket i Vestafrika og vi er tilbage hvor vi startede. SDG målene skal have et dansk udtryk, men hvad er de danske kompetencer på globalt plan når sundhed ikke længere er en kerneakti......WHO anså fra i går ikke længere ebola for at være en trussel mod global folkesundhed, så fra i dag er kameraerne slukket i Vestafrika og vi er tilbage hvor vi startede. SDG målene skal have et dansk udtryk, men hvad er de danske kompetencer på globalt plan når sundhed ikke længere er en...

  9. Stellar Laboratories: New GeV and Ge VI Oscillator Strengths and their Validation in the Hot White Dwarf RE0503-289

    Science.gov (United States)

    Rauch, T.; Werner, K.; Biemont, E.; Quinet, P.; Kruk, J. W.

    2013-01-01

    State-of-the-art spectral analysis of hot stars by means of non-LTE model-atmosphere techniques has arrived at a high level of sophistication. The analysis of high-resolution and high-S/N spectra, however, is strongly restricted by the lack of reliable atomic data for highly ionized species from intermediate-mass metals to trans-iron elements. Especially data for the latter has only been sparsely calculated. Many of their lines are identified in spectra of extremely hot, hydrogen-deficient post-AGB stars. A reliable determination of their abundances establishes crucial constraints for AGB nucleosynthesis simulations and, thus, for stellar evolutionary theory. Aims. In a previous analysis of the UV spectrum of RE 0503-289, spectral lines of highly ionized Ga, Ge, As, Se, Kr, Mo, Sn, Te, I, and Xe were identified. Individual abundance determinations are hampered by the lack of reliable oscillator strengths. Most of these identified lines stem from Ge V. In addition, we identified Ge VI lines for the first time. We calculated Ge V and Ge VI oscillator strengths in order to reproduce the observed spectrum. Methods. We newly calculated Ge V and Ge VI oscillator strengths to consider their radiative and collisional bound-bound transitions in detail in our non-LTE stellar-atmosphere models for the analysis of the Ge IV-VI spectrum exhibited in high-resolution and high-S/N FUV (FUSE) and UV (ORFEUS/BEFS, IUE) observations of RE 0503-289. Results. In the UV spectrum of RE 0503-289, we identify four Ge IV, 37 Ge V, and seven Ge VI lines. Most of these lines are identified for the first time in any star. We can reproduce almost all Ge IV, GeV, and Ge VI lines in the observed spectrum of RE 0503-289 (T(sub eff) = 70 kK, log g = 7.5) at log Ge = -3.8 +/- 0.3 (mass fraction, about 650 times solar). The Ge IV/V/VI ionization equilibrium, that is a very sensitive T(sub eff) indicator, is reproduced well. Conclusions. Reliable measurements and calculations of atomic data are a

  10. Organophosphinic, phosphonic acids and their binary mixtures as extractants for molybdenum(VI) and uranium(VI) from aqueous HCl media

    International Nuclear Information System (INIS)

    Extraction studies of uranium(VI) and molybdenum(VI) with organophosphoric, phosphinic acid and its thiosubstituted derivatives have been carried out from 0.1-1.0M HCl solutions. The extracted species are proposed to be UO2R2 and MoO2CIR on the basis of slope analysis for uranium(VI) and molybdenum(VI), respectively. The extraction efficiencies of PC-88A, Cyanex 272, Cyanex 301 and Cyanex 302 in the extraction of molybdenum(VI) and uranium(VI) are compared. Synergistic effects have been studied with binary mixtures of extractants. Separation of molybdenum(VI) from uranium(VI) is feasible by Cyanex 301 from 1M HCl, the separation factor logβ being 2.3. (author) 20 refs.; 5 figs.; 14 tabs

  11. Diverse anaerobic Cr(VI) tolerant bacteria from Cr(VI)-contaminated 100H site at Hanford

    Science.gov (United States)

    Chakraborty, R.; Phan, R.; Lam, S.; Leung, C.; Brodie, E. L.; Hazen, T. C.

    2007-12-01

    Hexavalent Chromium [Cr(VI)] is a widespread contaminant found in soil, sediment, and ground water. Cr(VI) is more soluble, toxic, carcinogenic, and mutagenic compared to its reduced form Cr(III). In order to stimulate microbially mediated reduction of Cr(VI), a poly-lactate compound HRC was injected into the chromium contaminated aquifers at site 100H at Hanford. Based on the results of the bacterial community composition using high-density DNA microarray analysis of 16S rRNA gene products, we recently investigated the diversity of the dominant anaerobic culturable microbial population present at this site and their role in Cr(VI) reduction. Positive enrichments set up at 30°C using specific defined anaerobic media resulted in the isolation of an iron reducing isolate strain HAF, a sulfate reducing isolate strain HBLS and a nitrate reducing isolate, strain HLN among several others. Preliminary 16S rDNA sequence analysis identifies strain HAF as Geobacter metallireducens, strain HLN as Pseudomonas stutzeri and strain HBLS as a member of Desulfovibrio species. Strain HAF isolated with acetate as the electron donor utilized propionate, glycerol and pyruvate as alternative carbon sources, and reduced metals like Mn(IV) and Cr(VI). Growth was optimal at 37°C, pH of 6.5 and 0% salinity. Strain HLN isolated with lactate as electron donor utilized acetate, glycerol and pyruvate as alternative carbon sources, and reduced metals like Mn(IV) and Cr(VI). Optimal growth was observed at 37°C, at a pH of 7.5 and 0.3% salinity. Anaerobic active washed cell suspension of strain HLN reduced almost 95 micromolar Cr(VI) within 4 hours relative to controls. Further, with 100 micromolar Cr(VI) as the sole electron acceptor, cells of strain HLN grew to cell numbers of 4.05X 107/ml over a period of 24hrs after an initial lag, demonstrating direct enzymatic Cr(VI) reduction by this species. 10mM lactate served as the sole electron donor. These results demonstrate that Cr(VI

  12. Síntese eletroquímica do ion ferrato(VI) Eletrochemical synthesis of iron(VI) ferrate

    OpenAIRE

    Maria Augusta de Luca; Sérgio João de Luca; Maria Alice Santana

    2003-01-01

    The optimization of ferrate(VI) ion generation has been studied due to its favorable characteristics for application in several fields, including environmental quality control. The paper presents the best conditions for electrolytic generation of ferrate(VI) in alkaline media. An appropriate electrolyte was NaOH, 10 mol/L. Circulation of the electrolyte solution was important to avoid acidification close to the anode surface. An anode pre-cleaning with 10% HCl was more efficient than a cathod...

  13. Oxocomplexes of Mo(VI) and W(VI) with 8-hydroxyquinoline-5-sulfonate in solution: structural studies and the effect of the metal ion on the photophysical behaviour.

    Science.gov (United States)

    Ramos, M Luísa; Justino, Licínia L G; Abreu, Paulo E; Fonseca, Sofia M; Burrows, Hugh D

    2015-11-28

    Multinuclear ((1)H, (13)C, (95)Mo and (183)W) NMR spectroscopy, combined with DFT calculations, provides detailed information on the complexation between the Mo(VI) and W(VI) oxoions and 8-hydroxyquinoline-5-sulfonate (8-HQS) in aqueous solution. Over the concentration region studied, Mo(VI) and W(VI) oxoions form three homologous complexes with 8-HQS in water in the pH range 2-8. Two of these, detected at pH complex, dominant at slightly higher pH values (5-8) for solutions with a 1 : 1 metal : ligand molar ratio, has a binuclear M2O5(2+) centre coordinated to two 8-HQS ligands. The two metal atoms are bridged by three oxygen atoms, two coming from 8-HQS, together with the M-O-M bridge of the bimetallic centre. We show that the long-range exchange corrected BOP functional with local response dispersion (LCBOPLRD), together with explicit solvent molecules, leads to geometries that readily converge to equilibrium structures having realistic bridging O8-HQS-M bonds. Previous attempts to calculate the structures of such binuclear complexes using DFT with the B3LYP functional have failed due to difficulties in treating the weak interaction in these bridged structures. We believe that the LCBOPLRD method may be of more general application in theoretical studies in related binuclear metal complexes. UV/visible absorption and luminescence spectra of all the complexes have also been recorded. The complex between Mo(vi) and 8-HQS is only weakly luminescent, in contrast to what has been observed with this ligand and many other metal ions. We suggest that this is due to the presence of low-lying ligand-to-metal charge transfer (LMCT) states close to the emitting ligand-based level which quench the emission. However, with W(VI), DFT calculations show that the LMCT states are now much higher in energy than the ligand based levels, leading to a marked increase in fluorescence. PMID:26498366

  14. I. Synthesis and characterization of volatile uranium(V) and uranium(VI) alkoxides. II. Isotope selective infrared photochemistry of uranium(VI) hexamethoxide

    International Nuclear Information System (INIS)

    I. A number of uranium(V) and uranium(VI) alkoxides were prepared and characterized, with particular attention to volatility and vibrational spectroscopy. Volatility data and x-ray crystallography implied the uranium(V) complexes to be associated as dimers or higher polymers. The uranium(VI) alkoxides were determined to be monomeric through similar considerations. A detailed discussion of uranium hexamethoxide vibrational data is given, with regard to its suitability for infrared laser photolysis with a CO2-TEA laser. II. Infrared laser photolysis of uranium hexamethoxide was shown to selectively dissociate the 238U containing species, when irradiated with a CO2-TEA laser. Wavelength and fluence dependencies were measured, yielding an optimum 235U enrichment factor (for the unreacted material) of 1.0335 on the P(38)/10.6 μ laser transition at 3.2 J/cm2. A selectivity of 1.5 was calculated from dissociation yield experiments. The photolysis products were analyzed, and the initial reaction was determined to be methoxy radical elimination. Secondary reaction products, in the form of polymethoxy ethers, appear to be the result of intramolecuar reactions (on the uranium substrate) initiated by collisional processes. Several mechanisms are proposed

  15. Temperature effect on the retention of U(VI) by SrTiO3

    International Nuclear Information System (INIS)

    The purpose of this research was the study of the interaction mechanisms between U(VI) ions and SrTiO3 surfaces versus pH and temperature: 25, 50, 75 and 90 C. Firstly, a physicochemical characterization was realized (DRX, MEB, FTIR) and the surface site density was determined. The potentiometric titration data were simulated, for each temperature, using the constant capacitance model and taking into account bath protonation of the ≡Sr-OH surface sites and deprotonation of the ≡Ti-OH ones (one pKa model). Both enthalpy and entropy changes, corresponding to the surface acid-base reactions, were evaluated using the van't Hoff relation. U(VI) was sorbed onto SrTiO3 powder in the pH range 0.5-5.0 with an U(VI) initial concentration 1.10-4 M. By TRLIFS two U(VI) complexes were detected associated with two lifetime values (60 ± 5 and 12 ± 2 μs at 25 C). The sorption edges were simulated using FITEQL 4.0 software. The surface complexation constants of the system SrTiO3/U(VI) between 25 and 90 C temperature range were thus obtained with the constant capacitance model considering two reactive surface sites. It reveals that two types of surface complex, namely [(≡SrOH)(≡TiOH)UO2]2+ and [(≡TiOH)(≡TiO)UO2+]2+, are needed to properly describe the experimental observations. By application of the van't Hoff equation, DeltaRS0 and DeltaRH0 were obtained, which indicated an endothermic sorption process. Finally, an energy transfer study was realised by TRLIFS. The energy transfer between Tb3+ and Eu3+ ions sorbed onto SrTiO3 powders were investigated. The results showed that the energy transfer between Tb3+ and Eu3+ is a non-radiative process and follows a dipole-dipole type interaction. A formalism based on the Dexter and the Inokuti-Hirayama theories was used to calculate the distances (2,7-3,4 Angstroms between Tb3+ and Eu3+ onto SrTiO3 surface. (author)

  16. Use of Digital Images and Principal Component Analysis for the Identification of Cr (VI Levels in Soil Samples [Uso de Imagens Digitais e Análise de Componentes Principais na Identificação dos Níveis de Cr (VI em Amostras de Solos

    Directory of Open Access Journals (Sweden)

    Amanda M. D. Jesus

    2013-03-01

    Full Text Available The proposition of simple and rapid methods for the identification of Cr (VI levels in soil samples is desirable to guide remediation strategies. The aim of the present study was to develop a method for soils samples identification with Cr (VI concentrations exceeding the values specified by international legislations. A soil sample was spiked with Cr (VI concentrations varying from 0 to 20 mg.kg-1 (total of 61 fortifications and subsequently submitted to an alkaline extraction. The extracts were deposited in Petri plates and diphenylcarbazide 0.2 % (m.v-1 as colorimetric reagent and H2SO4(5 mol.L-1 for pH adjustment were added. After color development, the plates were placed in a commercial scanner and images oftheir bottom part were acquired. The images were treated withcomputer programs to calculate the following color descriptors: R, G, B, H, S, V, r, g, b, L and an analysis by PCA (Principal Component Analysis was performed. There was a good separation between values above and below the Italian legislation, which specifies a maximum value of 2.0 mg.kg-1 for Cr (VI. Also were used the Cr (VI values set by legislation of Canada and Sweden were used and, in general, the images allowed the identification of levels of Cr (VI for these countries. Furthermore, through the visual analysis of PCA it is possible to state that digital images have potential to be used for the proposition of classification models.

  17. Magnetic chitosan for removal of uranium (VI)

    International Nuclear Information System (INIS)

    The chitosan, an aminopolysaccharide formed for repeated units of D-glucosamine, is a deacetylation product of chitin. It presents favorable ionic properties acting as chelant, being considered a removing ionic of contaminants from water effluents. It has ample bioactivity, that is, is biocompatible, biodegradable, bioadhesive and biosorbent. The chitosan interacts for crosslinked by means of its active groups with other substances, can still coat superparamagnetic materials as magnetite nanoparticles producing one conjugated polymer-magnetite. Superparamagnetic materials are susceptible for the magnetic field, thus these particles can be attracted and grouped by a magnetic field and as they do not hold back the magnetization, they can be disagrouped and reused in processes for removal of contaminants from industrial effluents and waste water. The present work consisted of preparing coated magnetic magnetite particles with chitosan (PMQ). The PMQ powder has showed a magnetic response of intense attraction in the presence of a magnetic field without however becoming magnetic, a typical behavior of superparamagnetic material. It was characterized by Fourier transform infrared spectrometry and measurements of magnetization. Its performance of Uranium (VI) adsorption as uranyl species, U022+, was evaluated with regard to the influence of adsorbent dose, speed of agitation, pH, the contact time and had studied the isotherms of adsorption as well as the behavior of desorption using ions of carbonate and oxalate. The optimal pH to the best removal occurred in pH 5 and that the increase of the dose increases the removal, becoming constant above of 20 g.L-1. In the kinetic study the equilibrium was achieved after 20 minutes. The results of equilibrium isotherm agreed well with the Langmuir model, being the maximum adsorption capacity equal 41.7 mg.g-1. In the desorption studies were verified 94% of U022+ recovered with carbonate ion and 49.9% with oxalate ion. (author)

  18. Nuclear Data Processing for Reactor Physics Calculation

    International Nuclear Information System (INIS)

    Nuclear data processing for reactor physics calculation has been done. Raw nuclear data cross-sections on file ENDF should be prepared and processed before it used in neutronic calculation. The processing code system such as NJOY-PC code has been used from linearization of nuclear cross-sections data and background contribution of resonance parameter (MF2) using RECONR module (0K) with energy range from 10-5 to 107 eV. Afterward, the neutron cross-sections data should be processed and broadened to desire temperature (i.e. 293K) by using BROADR module. The Grouper and Therma modules will be applied for multi-groups calculation which suitable for WIMS/D4 (69 groups) and thermalization of nuclear constants. The final stage of processing nuclear cross-sections is updating WIMS/D4 library. The WIMSR module in NJOY-PC and WILLIE code will be applied in this stage. The evaluated nuclear data file, especially for 1H1 isotope, was taken from JENDL-3.2 and ENDF/B-VI for preliminary study. The results of nuclear data processing 1H1 shows that the old-WIMS (WIMS-lama) library have much discrepancies comparing with JENDL-3.2 or ENDF/B-VI files, especially in energy around 5 keV

  19. 12 CFR Appendix C to Subpart A of... - Appendix C to Subpart A of Part 327

    Science.gov (United States)

    2010-01-01

    ... 12 Banks and Banking 4 2010-01-01 2010-01-01 false Appendix C to Subpart A of Part 327 C Appendix C to Subpart A of Part 327 Banks and Banking FEDERAL DEPOSIT INSURANCE CORPORATION REGULATIONS AND... degree of vulnerability to adverse economic, industry, market, and liquidity events. Examples include:...

  20. 40 CFR Appendix I to Subpart B of... - Appendix I to Subpart B of Part 205

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 24 2010-07-01 2010-07-01 false Appendix I to Subpart B of Part 205 I Appendix I to Subpart B of Part 205 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) NOISE ABATEMENT PROGRAMS TRANSPORTATION EQUIPMENT NOISE EMISSION CONTROLS Medium and Heavy Trucks...

  1. Molecular evolution of type VI intermediate filament proteins

    Directory of Open Access Journals (Sweden)

    Vincent Michel

    2007-09-01

    Full Text Available Abstract Background Tanabin, transitin and nestin are type VI intermediate filament (IF proteins that are developmentally regulated in frogs, birds and mammals, respectively. Tanabin is expressed in the growth cones of embryonic vertebrate neurons, whereas transitin and nestin are found in myogenic and neurogenic cells. Another type VI IF protein, synemin, is expressed in undifferentiated and mature muscle cells of birds and mammals. In addition to an IF-typical α-helical core domain, type VI IF proteins are characterized by a long C-terminal tail often containing distinct repeated motifs. The molecular evolution of type VI IF proteins remains poorly studied. Results To examine the evolutionary history of type VI IF proteins, sequence comparisons, BLAST searches, synteny studies and phylogenic analyses were performed. This study provides new evidence that tanabin, transitin and nestin are indeed orthologous type VI IF proteins. It demonstrates that tanabin, transitin and nestin genes share intron positions and sequence identities, have a similar chromosomal context and display closely related positions in phylogenic analyses. Despite this homology, fast evolution rates of their C-terminal extremity have caused the appearance of repeated motifs with distinct biological activities. In particular, our in silico and in vitro analyses of their tail domain have shown that (avian transitin, but not (mammalian nestin, contains a repeat domain displaying nucleotide hydrolysis activity. Conclusion These analyses of the evolutionary history of the IF proteins fit with a model in which type VI IFs form a branch distinct from NF proteins and are composed of two major proteins: synemin and nestin orthologs. Rapid evolution of the C-terminal extremity of nestin orthologs could be responsible for their divergent functions.

  2. Thermal stabilization of chromium(VI) in kaolin.

    Science.gov (United States)

    Wei, Yu-Ling; Chiu, Shu-Yuan; Tsai, Hsien-Neng; Yang, Yaw-Wen; Lee, Jyh-Fu

    2002-11-01

    Reduction of Cr(VI) by heating may be a useful detoxification mechanism for thermal immobilization. Using X-ray absorption spectroscopy, the change of speciation of chromium in 105 degrees C dried 3.7% Cr(VI)-sorbed kaolin further heated at 500, 900, or 1100 degrees C was studied. The 105 degrees C dried 3.7% Cr(VI)-sorbed kaolin sample was prepared by mixing 1.5 L of 0.257 M CrO3 solution (pH 0.71) with 0.5 kg of kaolin powder for 48 h, and then the slurry was heated (dried) at 105 degrees C until a constant weight was reached. The toxicity characteristic leaching procedure method was used to determine the percentage of leached chromium from all heated samples. In all 500-900 degrees C heated Cr(VI)-sorbed kaolin samples, Cr2O3 transformed from the hydrated Cr(VI) by a 4-h heat application was identified by the X-ray absorption near edge structure and extended X-ray absorption fine structure (EXAFS) spectroscopy as the key species that is leaching-resistant due to its low solubility. For the 1100 degrees C heated Cr(VI)-sorbed kaolin sample, the Fourier transform of its EXAFS spectrum indicates that the intensity of the peaks at 2.45 (Cr-Cr shell of Cr2O3) and 5.00 A (Cr-Cr and Cr-O shells of Cr2O3) without phase shift correction is either relatively smaller or disappearing, compared with that of the 500-900 degrees C heated Cr(VI)-sorbed kaolin samples. It is suggested that chromium octahedra were bridged to silica tetrahedra and incorporated in minerals formed at 1100 degrees C, such as mullite or sillimanite, since these phases were detected by XRD. Cr of this form is not easily leached. PMID:12433175

  3. The band gap of II-Vi ternary alloys in a tight-binding description

    Energy Technology Data Exchange (ETDEWEB)

    Olguin, Daniel; Blanquero, Rafael [Instituto Politecnico Nacional, Mexico, D.F (Mexico); De Coss, Romeo [Instituto Politecnico Nacional, Yucatan (Mexico)

    2001-02-01

    We present tight-binding calculations for the band gap of II-Vi pseudobinary ternary alloys. We use an sp{sup 3} s* tight-binding Hamiltonian which include spin-orbit coupling. The band gap composition dependence is calculated using a extended version of the virtual crystal approximation, which introduce an empirical correction factor that takes into account the non-linear dependence of the band gap with the composition. The results compare quite well with the experimental data, both for the ternary alloys with wide band gap and for the narrow band gap ones. [Spanish] Presentamos el calculo de la banda de energia prohibida de aleaciones ternarias de compuestos II-VI. El calculo, que incluye interaccion espin-orbita, se hace con el metodo de enlace fuerte, utilizando una base ortogonal de cinco orbitales atomicos por atomo (sp{sup 3} s*), en conjunto con la aproximacion del cristal virtual. En la aproximacion del cristal virtual, incluimos un factor de correccion que toma en cuenta la no linealidad de la banda de energia prohibida como funcion de la concentracion. Con esta correccion nuestros resultados reproducen aceptablemente los datos experimentales hallados en la literatura.

  4. 12 CFR Appendix C to Part 3 - Capital Adequacy Guidelines for Banks: Internal-Ratings-Based and Advanced Measurement Approaches

    Science.gov (United States)

    2010-01-01

    ... CFR part 225, appendix G, to calculate its risk-based capital requirements. (2) Any bank may elect to... CFR 3.12. (2) Specific risk-weighted asset amounts. (i) If the OCC determines that the risk-weighted.... Business environment and internal control factors means the indicators of a bank's operational risk...

  5. 12 CFR Appendix D to Part 325 - Capital Adequacy Guidelines for Banks: Internal-Ratings-Based and Advanced Measurement Approaches

    Science.gov (United States)

    2010-01-01

    ... CFR part 225, appendix G, to calculate its risk-based capital requirements. (2) Any bank may elect to... response procedures in 12 CFR 325.6(c). (2) Specific risk-weighted asset amounts. (i) If the FDIC.... Business environment and internal control factors means the indicators of a bank's operational risk...

  6. 12 CFR Appendix C to Part 567 - Risk-Based Capital Requirements-Internal-Ratings-Based and Advanced Measurement Approaches

    Science.gov (United States)

    2010-01-01

    ... CFR part 225, appendix G, to calculate its risk-based capital requirements. (2) Any savings..., Restructuring, and Improvement Act and under 12 CFR 567.1 (definition of “qualifying residential construction... association's underlying business risk factors and internal control environment. Carrying value means,...

  7. Radioactive wastes. Management prospects. Appendixes

    International Nuclear Information System (INIS)

    These appendixes complete the article BN3661 entitled 'Radioactive wastes. Management prospects'. They develop the principles of the different separation processes under study and make a status of the conditioning matrices that are envisaged: 1 - principles of advanced separation (separation of U, Np, Pu, Tc and I; separation of Am and Cm in two extraction steps (Diamex and Sanex processes); separation of Am and Cm in a single extraction step (Paladin process); separation of Am and Cm (Sesame process); separation of Cs (Calixarene process); 2 - principles of separation in pyro-chemistry: separation under inert atmosphere (non-oxidizing); separation in oxidizing conditions; 3 - conditioning matrices under study for separate elements: objectives and methodology, matrices for iodine, for cesium and for actinides. (J.S.)

  8. Solvent extraction of U(VI) and Th(IV) ions with N,N,N',N'-tetrabutylsuccinylamide from nitric acid solutions

    International Nuclear Information System (INIS)

    The solvent extraction of U(VI) and Th(IV) from nitric acid medium by N,N,N',N'-tetrabutylsuccinylamide (TBSA) in a diluent composed of 0.5 volume fraction trimethyl benzene (TMB) and 0.5 volume fraction kerosene (OK) has been studied. The distribution ratios of U(VI) and Th(IV) as a function of aqueous HNO3 concentration, extractant concentration and temperature have been measured. From the data, the composition of extracted species, equilibrium constants and enthalpies of extraction reaction are also calculated

  9. Resolving resonances in R-matrix calculations

    International Nuclear Information System (INIS)

    We present a technique to obtain detailed resonance structures from R-matrix calculations of atomic cross sections for both collisional and radiative processes. The resolving resonances (RR) method relies on the QB method of Quigley-Berrington (Quigley L, Berrington K A and Pelan J 1998 Comput. Phys. Commun. 114 225) to find the position and width of resonances directly from the reactance matrix. Then one determines the symmetry parameters of these features and generates an energy mesh whereby fully resolved cross sections are calculated with minimum computational cost. The RR method is illustrated with the calculation of the photoionization cross sections and the unified recombination rate coefficients of Fe XXIV, O VI, and Fe XVII. The RR method reduces numerical errors arising from unresolved R-matrix cross sections in the computation of synthetic bound-free opacities, thermally averaged collision strengths and recombination rate coefficients. (author)

  10. A novel strategy for Cr(III) and Cr(VI) analysis in dietary supplements by speciated isotope dilution mass spectrometry.

    Science.gov (United States)

    Unceta, Nora; Astorkia, Maider; Abrego, Zuriñe; Gómez-Caballero, Alberto; Goicolea, M Aránzazu; Barrio, Ramón J

    2016-07-01

    In recent years, Cr speciation in dietary supplements has become decisive in the evaluation of their health risks. Despite being an beneficial micronutrient, Cr(III) can be toxic at living organisms at high concentrations, while Cr(VI) is known to be highly toxic and carcinogenic. The main objective of this work was to optimize an analytical methodology for the extraction and accurate quantification of Cr(III) and Cr(VI) in dietary supplements. The extraction of Cr species was carried out with 50mM EDTA solution on a hotplate under optimized conditions. Special attention was paid to bidirectional species transformations. No noticeable oxidation of Cr(III) into Cr(VI) was observed and the reduction to Cr(III) only occurred at very high Cr(VI) concentrations. Cr(III) as Cr(EDTA)(-) complex was chromatographically separated from Cr(VI), retained as CrO4(2-), on an anion exchange column coupled to inductively coupled plasma mass spectrometry (LC-ICP-MS). The limit of quantification (0.08µgg(-1)) was below the limit established for Cr enriched yeasts by the European Union. Eleven dietary supplements were analyzed and Cr(III) and Cr(VI) quantification was carried out by external calibration monitoring (52)Cr isotope and by speciated isotope dilution mass spectrometry (SIDMS) adding (50)Cr(III) and (53)Cr(VI) spikes. Total Cr was also quantified by ICP-MS and mass balance between total Cr and the sum of Cr(III) and Cr(VI) was achieved. In eight of the eleven tested supplements Cr(III) calculated amounts were higher than those indicated by the manufacturer, but only one of them exceeded the 250µgday(-1) recommended by World Health Organization (WHO). In contrast, it is worth noting that Cr(VI) amounts beyond the recommendations of the European Union for Cr enriched yeasts were found in five supplements. These results revealed that more accurate and rigorous quality assurance protocols should be applied to the testing of the final products, including the analysis of both

  11. Reproducibility of the uptake of U(VI) onto degraded cement pastes and calcium silicate hydrate phases

    International Nuclear Information System (INIS)

    The U(VI) uptake in degraded cement pastes was undertaken in the laboratories of CEA/L3MR and SUBATECH in order to check the reproducibility of the study. Two well hydrated cement pastes, CEM I (ordinary portland cement, OPC) and CEM V (blast furnace slag (BFS) and fly ash added to OPC) were degraded using similar protocols. Equilibrium solutions and solid materials were characterised for three degradation states for each paste. All samples are free of portlandite and the pH of the equilibrated cement solutions vary in the range 9.8-12.2. Three calcium silicate hydrate phases (C-S-H) were synthesised in order to compare the sorption properties of degraded cement pastes and of hydrate phases in similar pH conditions. In order to avoid precipitation processes, the operational solubility limit was evaluated before batch experiments. These solubility values vary significantly in the pH range [9-13] with a 2.4 x 10-7 mol L-1 minimum at pH close to 10.5. In batch sorption experiments, the distribution ratio Rd values are high: 3 x 104 - 1.5 x 105 mL g-1. The uptake of U(VI) increases when comparing the least and the most degraded cement pastes whereas the initial composition of cement has relatively insensitive effect. Sorption isotherms, expressed as a log [U(VI)solid]/log[U(VI)solution] plots are linear. A slope of 1 is calculated indicating the predominance of sorption processes. As sorption and desorption values are close, the uptake mechanism seems reversible. The Rd values measured in C-S-H suspensions are in good agreement with Rd values of degraded cement pastes, and C-S-H materials could be one of the cementitious phases which control U(VI) uptake in cement pastes. (orig.)

  12. Appendix A: Word Parts and What They Mean

    Science.gov (United States)

    ... https://www.nlm.nih.gov/medlineplus/appendixa.html Appendix A: Word Parts and What They Mean To ... at the end of a medical word. This appendix supplements the MedlinePlus Understanding Medical Words tutorial. General ...

  13. Transport of U(VI) from sulphuric acid medium across supported liquid membrane (SLM) containing di-(2-ethylhexyl) phosphoric acid (D2EHPA)/n-dodecane as a carrier

    International Nuclear Information System (INIS)

    This paper reports on the supported liquid membrane (SLM) based transport studies of U(VI) from sulphate medium using di-(2-ethylhexyl) phosphoric acid/n-dodecane as carrier. Polytetrafluoroethylene membrane was used as solid support and H2SO4 as receiver phase. The effects of various parameters such as receiver phase concentration, feed acidity, carrier concentration, U(VI) concentration, membrane thickness and membrane pore size on U(VI) transport had been investigated. With increase in H2SO4 concentrations and pH of feed solution there is an increase in U(VI) transport across the SLM. Similarly with increase in membrane thickness the U(VI) transport decrease whereas in case of pore size variation reverse results are obtained. The membrane thickness variation results showed that the U(VI) transport across the SLM is entirely diffusion controlled and the diffusion coefficient the D(o) was calculated as 1.36 × 10-7 cm2 s-1. Based on optimized condition, a scheme had been tested for selective recovery of U(VI) from ore leach solution containing a large number of other metal ions. (author)

  14. Guideline for external radiation and protection. Risk calculation for protection and/or encapsulated sources and surface contamination

    International Nuclear Information System (INIS)

    In this guideline an overview is given of the calculation methods that can be or have to be applied for several installations and situations. The starting points of this guideline are conform the amended Decree Radiation Protection as formulated in the Dutch Nuclear Energy Law. In appendix 1 the weakening of ionizing radiation by means of transmission through matter is described. Appendix 2 illustrates the problemacy of the shielding of parallel and diverging bundles of photons on the basis of Monte Carlo simulation

  15. TRLFS Studies on Indirect Determination of U(IV) in Biological Samples Containing Mixed U(IV/VI) Species

    International Nuclear Information System (INIS)

    . The strategy is based on the measurement of U(VI) luminescence (LM) signals and the comparison of calculated U(VI) concentration before and after the oxidation of U(IV) species present in sample solution. Preliminary results using a standard addition method showed that the higher concentration of U(VI) after H2O2 oxidation was estimated in the given media samples indicating the presence of U(IV) before oxidation (see below). In addition, the influence of individual chemical component in the culture media on the LM intensity and decay lifetime was examined in detail

  16. Spectroscopic investigations of Np(V/VI) redox speciation in hyperalkaline TMA-(OH, Cl) solutions

    Energy Technology Data Exchange (ETDEWEB)

    Gaona, X.; Dardenne, K.; Liu, X.; Rothe, J.; Denecke, M.A.; Altmaier, M. [Karlsruhe Institute of Technology (KIT), Karlsruhe (Germany). Inst. fuer Nukleare Entsorgung; Tits, J.; Wieland, E. [Paul Scherrer Institut (PSI), Villigen (Switzerland). Lab. for Waste Management

    2012-07-01

    The redox chemistry of Np(V/VI) was investigated in {proportional_to} 0.6 M tetramethylammonium hydroxide/chloride (TMA-(OH, Cl)) solutions with 9 {<=} -log [H{sup +}] {<=} 13.5. Redox conditions were defined by the absence or presence of ClO{sup -} as oxidizing agent (Na-salt, 5 x 10{sup -3} M and 5 x 10{sup -2} M). The high total Np concentration ([Np]{sub tot} {proportional_to} 2 x 10{sup -3} M) led to the precipitation of solid phases in some of the samples. The carbonate concentration (as impurity of TMA-OH) was 2-3 x 10{sup -3} M. UV-vis/NIR spectra obtained from the supernatant in TMA-(OH, Cl) solutions and absence of ClO{sup -} showed clear Np(V) features, identified as NpO{sub 2}{sup +}, NpO{sub 2}CO{sub 3}{sup -} and (NpO{sub 2}){sub x}(CO{sub 3}){sub y}(OH){sub z}{sup x-2y-z}. No NIR features were observed within 800 nm {<=} {lambda} {<=} 1300 nm for samples with ClO{sup -}. XANES edge energies and features of these samples confirmed the predominance of Np(V) in the absence of ClO{sup -} and Np(VI) in the presence of ClO{sup -}, by comparison to XANES reference spectra of Np(III/IV/V/VI) prepared within the present work by in-situ electrolysis. A similar Np redox distribution was observed for the solid phases based on XANES and EXAFS measurements. EXAFS spectra indicative of Np{sup V}O{sub 2}OH(s) and Np{sup VI}O{sub 3} . xH{sub 2}O(s) were obtained for samples in absence and presence of ClO{sup -}, respectively. The formation of a Na-Np(VI) phase in 5 x 10{sup -2} M ClO{sup -} and -log [H{sup +}] {proportional_to} 12 was also indicated from the EXAFS, chemical analysis and SEM-EDS. These results indicate that Np(VI) aqueous species and solid compounds prevail far below the oxidation border of water in alkaline solutions and also far below the E{sub H} border calculated with the current NEA data selection [1]. These observations are further supported by correlations of literature thermodynamic data for actinides (U, Np, Pu and Am), which predict the

  17. Treatment of combined sewer overflows using ferrate (VI).

    Science.gov (United States)

    Gandhi, Rohan; Ray, Ajay K; Sharma, Virender K; Nakhla, George

    2014-11-01

    This paper presents the results of a study conducted on the treatment of combined sewer overflows using ferrate (VI) [Fe (VI)]. At a Fe (VI) dose of 0.24 mg/L, total chemical oxygen demand (TCOD), soluble chemical oxygen demand (SCOD), total biochemical oxygen demand (TBOD5), soluble biochemical oxygen demand (SBOD5), total suspended solids (TSS), volatile suspended solids (VSS), total phosphorus (TP), total nitrogen (TN), and soluble TN removal efficiencies of 71, 75, 69, 68, 72, 83, 64, 38, and 36%, respectively, were achieved. Kinetic studies revealed that a contact time of only 15 minutes is sufficient to achieve secondary effluent criteria. An innovative technique of using primary sludge (PS) and thickened waste activated sludge as a source for the in situ synthesis of ferrate was developed. A comparative study of treatment efficiencies achieved by Fe (VI) generated from different sources was done. At 0.1 mg/L dose of Fe (VI) synthesized from PS, TCOD, SCOD, TSS, VSS, TP, and TN removal efficiencies of 60, 62, 63, 67, 30, and 25%, respectively, were achieved. PMID:25509525

  18. ADHD : einkenni og viðbrögð

    OpenAIRE

    Ásdís Emilía Gunnlaugsdóttir; Katla Guðlaugsdóttir

    2009-01-01

    Í þessari ritgerð fjöllum við um helstu einkenni ADHD, algengar fylgiraskanir, greiningu, meðferð og hvernig ADHD hefur áhrif á allt fjölskyldulífið. Við teljum að þörf sé á að auka þekkingu á einkennum ADHD til að hægt sé að mæta þörfum þessara barna á viðeigandi hátt. Með aukinni þekkingu minnka fordómar og skilningur eykst. Við vonum að þessi ritgerð sé gott innlegg í fræðslu um ADHD, sem grunnupplýsingar um helstu einkenni barna með ADHD og einnig fjöllum við um meðferðarleiðir og ráð sem...

  19. Organomolybdenum (VI) and lithium Organomolybdate (VI) and (V) Complexes with C,N-Chelating Aminoaryl Ligands

    OpenAIRE

    van Koten, G.; Brandts, J.A.M.; Leur, M. de; Gossage, R. A.; Spek, A.L.

    1999-01-01

    The synthesis and characterization of new, five-coordinate molybdenum bis(imidoaryl) complexes [Mo(NAr)2(C-N)X] (Ar = C6H3i-Pr2-2,6; C-N = [C6H4(CH2NMe2)-2]-; X = Cl (1), Me (2), Et (3), Bu (4), CH2SiMe3 (5), (p-tolyl) (6), (C-N) (7)) is reported. The solid-state structure of 2 has been elucidated by single-crystal X-ray analysis. Compounds 2, 3, 4, 5, and 6 react with alkyl- or aryllithium compounds to form lithium molybdate(VI) derivatives, of which [Li(DME)Mo(NAr)2(C-N)(Me)(p-tolyl)] (10),...

  20. Characterization of ZrP2O7 modified with oxalic acid and thermodynamic analysis associated to the uranyl (Vi) sorption

    International Nuclear Information System (INIS)

    Several physical and chemical tests were carried out to evaluate the influence of the oxalic acid in the uranium (Vi) sorption on the surface of the zirconium diphosphate. The physical analyses consist of atomic force microscopy (AFM) and total organic coal, and the chemists are the calculation of the reaction heat for the hydrate and sorption processes, the reaction speed constant and the sorption yield in the sodium perchlorate systems and of oxalic acid; these tests allow to corroborate that the oxalic acid influences positively in the uranium (Vi) sorption forming a ternary system of ZrP2O7/(C2O4)/U(Vi), with a single configuration along the ph interval studied. (Author)

  1. Theory of anomalous resistivity associated with structural phase transitions in IV-VI compounds

    Science.gov (United States)

    Katayama, S.; Mills, D. L.

    1980-07-01

    A theoretical description of electrical-resistivity anomalies associated with structural phase transitions of IV-VI compound semiconductors is presented, taking account of interband electron-soft-TO-phonon scattering. The sublattice displacement and rhombohedral strain in the low-temperature phase are calculated within the framework of a self-consistent mean-field theory, with emphasis on the effect of electron-phonon couplings. The resistivity due to the scattering of free carriers from acoustic phonons and optic phonons is examined, including the carrier transfer among the four valleys due to valley splitting below the transition temperature (Tc). The theoretical calculations of electrical resistivity as well as order parameters are in good accord with data on p-type SnTe at the quantitative level.

  2. Appendix

    DEFF Research Database (Denmark)

    Friis, Ib; Thulin, Mats

    2009-01-01

    A taxonomic and floristic account of all the additional or new species in Etyhiopia and/or Eritrea that have been discovered while Vols 2 - 7 of the Flora of Ethiopia and Eritrea were being published....

  3. Appendix.

    Science.gov (United States)

    Yaple, Ross A; O'Loughlin, Kerry; Hudziak, Jim

    2016-04-01

    This article is designed to serve as a reference for researchers and clinicians interested in extant evidence-based programs designed to promote healthy youth development. This article begins with a review of 2 freely available online registries of evidence-based youth development programs. Both registries compile information on healthy youth development programs and rate such programs on pre-established criteria. This article also outlines several specific model programs, which intervene on a variety of targets to promote healthy youth development. Lastly, this article also outlines emerging youth development programs. The model and emerging programs reviewed have resulted in myriad positive outcomes. PMID:26980133

  4. Kinetics, thermodynamics and surface heterogeneity assessment of uranium(VI) adsorption onto cation exchange resin derived from a lignocellulosic residue

    International Nuclear Information System (INIS)

    A new cation exchange resin (PGTFS-COOH) having a carboxylate functional group at the chain end was prepared by grafting poly(hydroxyethylmethacrylate) onto tamarind fruit shell, TFS (a lignocellulosic residue) using potassium peroxydisulphate-sodium thiosulphate redox initiator, and in the presence of N,N'-methylenebisacrylamide (MBA) as a crosslinking agent, followed by functionalisation. The adsorbent was characterized with the help of FTIR, XRD, scanning electron micrographs (SEM), and potentiometric titrations. The kinetic and isotherm data, obtained at optimum pH value 6.0 at different temperatures could be fitted with pseudo-second-order equation and Sips isotherm model, respectively. An increase in temperature induces positive effect on the adsorption process. The calculated activation energy of adsorption (Ea, 18.67 kJ/mol) indicates that U(VI) adsorption was largely due to diffusion-controlled process. The values of adsorption enthalpy, Gibbs free energy, and entropy were calculated using thermodynamic function relationships. The decrease in adsorption enthalpy with increasing U(VI) uploading on the adsorbent, reflects the surface energetic heterogeneity of the adsorbent. The isosteric heat of adsorption was quantitatively correlated with the fractional loading for the U(VI) ions adsorption onto PGTFS-COOH. The results showed that the PGTFS-COOH possessed heterogeneous surface with sorption sites having different activities.

  5. 40 CFR Appendix A to Part 63 - Test Methods

    Science.gov (United States)

    2010-07-01

    ....2.1A clearly written test method, preferably in the format of 40 CFR part 60, appendix A Test... reference from other methods in appendix A to 40 CFR part 60. Therefore, to obtain reliable results, persons... 40 Protection of Environment 14 2010-07-01 2010-07-01 false Test Methods A Appendix A to Part...

  6. 49 CFR Appendix to Part 38 - Guidance Material

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 1 2010-10-01 2010-10-01 false Guidance Material Appendix to Part 38... SPECIFICATIONS FOR TRANSPORTATION VEHICLES Pt. 38, App. Appendix to Part 38—Guidance Material This appendix....5. A research project sponsored by the Architectural and Transportation Barriers Compliance...

  7. 14 CFR Appendix C to Part 147 - Airframe Curriculum Subjects

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 3 2010-01-01 2010-01-01 false Airframe Curriculum Subjects C Appendix C... Appendix C to Part 147—Airframe Curriculum Subjects This appendix lists the subjects required in at least 750 hours of each airframe curriculum, in addition to at least 400 hours in general...

  8. 14 CFR Appendix D to Part 147 - Powerplant Curriculum Subjects

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 3 2010-01-01 2010-01-01 false Powerplant Curriculum Subjects D Appendix D... Appendix D to Part 147—Powerplant Curriculum Subjects This appendix lists the subjects required in at least 750 hours of each powerplant curriculum, in addition to at least 400 hours in general...

  9. Simulation of fires based on flow calculation

    International Nuclear Information System (INIS)

    The fire simulation based on flow calculation is described in the publication, and the calculated result is compared with the results obtained from fire tests. The tests have been made in Germany in a nuclear power plant removed from service. The simulation describes the flow field of the entire building, the main features of the construction effecting on it and the edge conditions. The fire is described as a given source, the value of which varies as a function of time. Heat transfer into the constructions is described using a separate heat transfer program. The result obtained from calculation describes the flow and temperature fields formed in a fire generally correctly. Due to the used sparse calculation network the results contain locally large deviations. The discrete-transfer radiation calculation method used for calculation of burning and heat transfer, and testing of it are described in the appendix. The method describes the heat radiation propagating diagonally to the calculation network better than the six-flux method used before

  10. Preparation and characterization of surface imprinted polymer for selective sorption of uranium(VI)

    International Nuclear Information System (INIS)

    A new surface ion-imprinted polymer for the selective sorption of U(VI) from aqueous solution was prepared by copolymerization of a binary complex of U(VI) with methacrylic acid. The adsorption behavior of U(VI) onto the imprinted polymer was investigated by batch experiments and the results demonstrated that the maximum adsorption capacity of U(VI)-imprinted and non-imprinted polymers was found to be 35.92 and 22.58 mg g-1, respectively. The selectivity study revealed that the U(VI)-imprinted polymer exhibited excellent selectivity and affinity toward U(VI) in the presence of competitive metal ions. (author)

  11. Synthesis, characterization and properties of ethylenediamine-functionalized Fe3O4 magnetic polymers for removal of Cr(VI) in wastewater.

    Science.gov (United States)

    Zhao, Yong-Gang; Shen, Hao-Yu; Pan, Sheng-Dong; Hu, Mei-Qin

    2010-10-15

    A series of ethylenediamine (EDA)-functionalized magnetic polymers (EDA-MPs) have been prepared via suspension polymerization with the usage amount of the functional monomer glycidylmethacrylate (GMA) varied during the suspension polymerization procedure. The EDA-MPs were characterized by transmission electron microscopy (TEM), vibrating sample magnetometer (VSM), X-ray diffractometer (XRD), thermogravimetry and differential thermogravimetry analysis (TG-DTA), Fourier-transformed infrared spectroscopy (FTIR) and elementary analyzer (EA). The adsorption properties of the EDA-MPs for the removal of Cr(VI) in wastewater were deeply studied. The results showed the adsorption efficiency was highly pH dependent and decreased with the increasing of initial concentration of Cr(VI). The adsorption data taken at the optimized condition, i.e., 35 degrees C and pH of 2.5 were well fitted with the Langmuir isotherm. The maximum adsorption capacities (q(m)) of EDA-MPs to Cr(VI) were highly related to the contents of EDA-MPs, i.e., the q(m) of EDA-MPs to Cr(VI) calculated from the Langmuir isotherm increased from 32.15 to 61.35 mg g(-1) with the increasing of the usage amount of GMA. The adsorption kinetic data were modeled by the pseudo-second-order rate equation, and the adsorption of Cr(VI) by all the present EDA-MPs reached equilibrium in 60 min. PMID:20621418

  12. Two benchmarks for qualification of pressure vessel fluence calculational methodology

    International Nuclear Information System (INIS)

    Two benchmarks for the qualification of the pressure vessel fluence calculational methodology were formulated and are briefly described. The Pool Critical Assembly (PCA) benchmark is based on the experiments performed at the PCA in Oak Ridge. The measured quantities to be compared against the calculated values are the equivalent fission fluxes at several locations in front, behind, and inside the pressure-vessel wall simulator. This benchmark is particularly suitable to test the capabilities of the calculational methodology and cross-section libraries to predict in-vessel gradients because only a few approximations are necessary in the analysis. The HBR-2 benchmark is based on the data for the H.B. Robinson-2 plant, which is a 2,300 MW (thermal) pressurized light-water reactor. The benchmark provides the reactor geometry, the material compositions, the core power distributions, and the power historical data. The quantities to be calculated are the specific activities of the radiometric monitors that were irradiated in the surveillance capsule and in the cavity location during one fuel cycle. The HBR-2 benchmark requires modeling approximations, power-to-neutron source conversion, and treatment of time dependant variations. It can therefore be used to test the overall performance and adequacy of the calculational methodology for power-reactor pressure-vessel flux calculations. Both benchmarks were analyzed with the DORT code and the BUGLE-96 cross-section library that is based on ENDF/B-VI evaluations. The calculations agreed with the measurements within 10%, and the calculations underpredicted the measurements in all the cases. This indicates that the ENDF/B-VI cross sections resolve most of the discrepancies between the measurements and calculations. The decrease of the CIM ratios with increased thickness of iron, which was typical for pre-ENDF/B-VI libraries, is almost completely removed

  13. Nitrate Enhanced Microbial Cr(VI) Reduction-Final Report

    Energy Technology Data Exchange (ETDEWEB)

    John F. Stolz

    2011-06-15

    A major challenge for the bioremediation of radionuclides (i.e., uranium, technetium) and metals (i.e., Cr(VI), Hg) is the co-occurrence of nitrate as it can inhibit metal transformation. Denitrification (nitrate reduction to dinitrogen gas) is considered the most important ecological process. For many metal and metalloid reducing bacteria, however, ammonia is the end product through respiratory nitrate reduction (RNRA). The focus of this work was to determine how RNRA impacts Cr(VI) transformation. The goal was to elucidate the specific mechanism(s) that limits Cr(VI) reduction in the presence of nitrate and to use this information to develop strategies that enhance Cr(VI) reduction (and thus detoxification). Our central hypothesis is that nitrate impacts the biotransformation of metals and metalloids in three ways 1) as a competitive alternative electron acceptor (inhibiting transformation), 2) as a co-metabolite (i.e., concomitant reduction, stimulating transformation), and 3) as an inducer of specific proteins and pathways involved in oxidation/reduction reactions (stimulating transformation). We have identified three model organisms, Geobacter metallireducens (mechanism 1), Sulfurospirillum barnesii, (mechasism 2), and Desulfovibrio desulfuricans (mechanisms 3). Our specific aims were to 1) investigate the role of Cr(VI) concentration on the kinetics of both growth and reduction of nitrate, nitrite, and Cr(VI) in these three organisms; 2) develop a profile of bacterial enzymes involved in nitrate transformation (e.g., oxidoreductases) using a proteomic approach; 3) investigate the function of periplasmic nitrite reductase (Nrf) as a chromate reductase; and 4) develop a strategy to maximize microbial chromium reduction in the presence of nitrate. We found that growth on nitrate by G. metallireducens was inhibited by Cr(VI). Over 240 proteins were identified by LC/MS-MS. Redox active proteins, outer membrane heavy metal efflux proteins, and chemotaxis sensory

  14. John Prados, La guerre du Viêt-nam

    OpenAIRE

    Cadeau, Ivan

    2012-01-01

    Si les écrits ayant pour objet la guerre d’Indochine sont abondants, les ouvrages de référence relatifs à la guerre américaine du Viêt-nam se révèlent plutôt rares dans l’historiographie française. La récente parution du livre de John Prados, La guerre du Viêt-nam, vient combler cette lacune. Cette publication, qui aurait pu aussi bien s’appeler Histoire politique de la guerre du Viêt-nam tant elle se focalise sur une approche analytique des événements politiques au détriment de l’étude des o...

  15. Benchmark analysis of MCNP trademark ENDF/B-VI iron

    International Nuclear Information System (INIS)

    The MCNP ENDF/B-VI iron cross-section data was subjected to four benchmark studies as part of the Hiroshima/Nagasaki dose re-evaluation for the National Academy of Science and the Defense Nuclear Agency. The four benchmark studies were: (1) the iron sphere benchmarks from the Lawrence Livermore Pulsed Spheres; (2) the Oak Ridge National Laboratory Fusion Reactor Shielding Benchmark; (3) a 76-cm diameter iron sphere benchmark done at the University of Illinois; (4) the Oak Ridge National Laboratory Benchmark for Neutron Transport through Iron. MCNP4A was used to model each benchmark and computational results from the ENDF/B-VI iron evaluations were compared to ENDF/B-IV, ENDF/B-V, the MCNP Recommended Data Set (which includes Los Alamos National Laboratory Group T-2 evaluations), and experimental data. The results show that the ENDF/B-VI iron evaluations are as good as, or better than, previous data sets

  16. The solvent extraction of Am(VI) using centrifugal contactors

    International Nuclear Information System (INIS)

    An engineering-scale centrifugal contactor test bed was built at Idaho National Laboratory to perform solvent extraction testing for the partitioning of hexavalent americium. The raffinate simulant feed was spiked with 243Am and 139Ce and treated with sodium bismuthate to oxidize americium to Am(VI), filtered and contacted with 1 M DAAP/dodecane using centrifugal contactors. Extraction efficiency comparable to batch contacts was obtained, indicating for the first time that Am(VI) can be maintained under process conditions. Contrary to expectations, stripping was not as effective as expected. However, this result may actually be advantageous to process design, since a scrub step, previously thought to be impossible due to rapid Am(VI) reduction, may now be considered for future flowsheet tests. (author)

  17. Surface stability and the selection rules of substrate orientation for optimal growth of epitaxial II-VI semiconductors

    International Nuclear Information System (INIS)

    The surface structures of ionic zinc-blende CdTe (001), (110), (111), and (211) surfaces are systematically studied by first-principles density functional calculations. Based on the surface structures and surface energies, we identify the detrimental twinning appearing in molecular beam epitaxy (MBE) growth of II-VI compounds as the (111) lamellar twin boundaries. To avoid the appearance of twinning in MBE growth, we propose the following selection rules for choosing optimal substrate orientations: (1) the surface should be nonpolar so that there is no large surface reconstructions that could act as a nucleation center and promote the formation of twins; (2) the surface structure should have low symmetry so that there are no multiple equivalent directions for growth. These straightforward rules, in consistent with experimental observations, provide guidelines for selecting proper substrates for high-quality MBE growth of II-VI compounds

  18. Cohesive energy of zincblende (A$^{III}$ B$^{V}$ and A$^{II}$B$^{VI}$) structured solids

    Indian Academy of Sciences (India)

    A S Verma; B K Sarkar; V K Jindal

    2010-05-01

    In this paper we present an expression relating the cohesive energy (coh in kcal/mol) of A$^{III}$B$^{V}$ and A$^{II}$ B$^{VI}$ semiconductors with the product of ionic charges ($Z_{1}Z_{2}$) and nearest-neighbour distance d (Å). The cohesive energy values of these solids exhibit a linear relationship when plotted on a log–log scale against the nearest-neighbour distance (Å), but fall on different straight lines according to the ionic charge product of the solids. A good agreement has been found between the experimental and calculated values of the cohesive energy of A$^{III}$B$^{V}$ and A$^{II}$B$^{VI}$ semiconductors.

  19. Surface stability and the selection rules of substrate orientation for optimal growth of epitaxial II-VI semiconductors

    Energy Technology Data Exchange (ETDEWEB)

    Yin, Wan-Jian [National Renewable Energy Laboratory, Golden, Colorado 80401 (United States); Department of Physics & Astronomy, and Wright Center for Photovoltaics Innovation and Commercialization, The University of Toledo, Toledo, Ohio 43606 (United States); Yang, Ji-Hui; Zaunbrecher, Katherine; Gessert, Tim; Barnes, Teresa; Wei, Su-Huai, E-mail: Suhuai.Wei@nrel.gov [National Renewable Energy Laboratory, Golden, Colorado 80401 (United States); Yan, Yanfa [Department of Physics & Astronomy, and Wright Center for Photovoltaics Innovation and Commercialization, The University of Toledo, Toledo, Ohio 43606 (United States)

    2015-10-05

    The surface structures of ionic zinc-blende CdTe (001), (110), (111), and (211) surfaces are systematically studied by first-principles density functional calculations. Based on the surface structures and surface energies, we identify the detrimental twinning appearing in molecular beam epitaxy (MBE) growth of II-VI compounds as the (111) lamellar twin boundaries. To avoid the appearance of twinning in MBE growth, we propose the following selection rules for choosing optimal substrate orientations: (1) the surface should be nonpolar so that there is no large surface reconstructions that could act as a nucleation center and promote the formation of twins; (2) the surface structure should have low symmetry so that there are no multiple equivalent directions for growth. These straightforward rules, in consistent with experimental observations, provide guidelines for selecting proper substrates for high-quality MBE growth of II-VI compounds.

  20. A relativistic study of the photochemistry of the uranyl(VI) ion in aqueous solution

    Energy Technology Data Exchange (ETDEWEB)

    Real, F.; Wahlgren, U. [Alballova University Center, Stockholm University, Fysikum, 104-91 Stockholm, (Sweden); Vallet, V. [Laboratoire PhLAM, Universite des Sciences et Technologies de Lille 1 CNRS UMR8523, 59655 Villeneuve d Ascq Cedex, (France); Marian, C. [Institut fur Theoretische Chemie und Computerchemie Heinrich-Heine-Universitat Universitatsstr. 40225 Dusseldorf (Georgia); Grenthe, I. [KTH Royal Institute of Technology, Inorganic Chemistry Se-10044 Stockholm, (Sweden)

    2007-07-01

    Complete text of publication follows: The U-O bond in the uranyl(VI) ion is in general considered to be kinetically inert in thermal reactions, such as isotope exchange reactions. However, a fast isotope exchange can take place in photochemical reactions under UV irradiation as exemplified by the reaction: U{sup 17}O{sub 2}(H{sub 2}O){sub 5}{sup 2+} + H{sub 2}*0 {yields} U{sup 17}O{sub 2}(H{sub 2}O){sub 5}{sup 2+} + H{sub 2}O (1) Under daylight, no exchange takes place, or the rate of exchange is very slow. This suggests that the reaction involves the excited-states of the uranyl(VI). 1) A comparison between wave-function theory and density-functional theory: The first part of this talk will discuss benchmark calculations of the excited states of the bare uranyl(VI) ion so that we can choose the computational cost effective ab initio method for the study of the photochemistry of actinide compounds. Before exploring the mechanism of exchange it is necessary to have information on the chemistry of the excited states and their electronic structure. It seems reasonable to assume that 'yl'-isotope exchange is related to the U-O{sub yl} stretching modes and following the work of Pierloot and van Besien [1] we have therefore studied the a{sub g}- and a{sub u}-modes of the U-O{sub yl} bond using different methods such as CASPT2, TD-DFT and DFT-MRCI and different basis set and description of the heavy-element. The scalar-relativistic effects were included using either the Douglas-Kroll Hamiltonian in the case of all-electron calculations or an RECP small core from the Stuttgart Library. The {sup 3}{gamma}{sub g} state seems to be a good candidate for the photochemically 'active' state where the increase of the U-O{sub yl} localizes the wave function and gives distant 'yl' oxygen attains radical character. 2) Photochemistry of the uranyl(VI) in aqueous solution: In the case of the photochemistry of the uranyl(VI), we suggest that the first step

  1. Manifestações radiológicas da mucopolissacaridose tipo VI Radiological findings in patients with mucopolysaccharidosis type VI

    Directory of Open Access Journals (Sweden)

    Celso Montenegro Turtelli

    2002-10-01

    Full Text Available O autor relata as alterações radiológicas da mucopolissacaridose tipo VI (mucopolissacárides VI observadas em dois irmãos. Foram realizadas radiografias convencionais do esqueleto e estudo por ressonância magnética do sistema nervoso central. As alterações osteoarticulares são bem conhecidas e em geral semelhantes às das outras mucopolissacárides. O estudo por ressonância magnética do sistema nervoso central pode colaborar no diagnóstico diferencial dessas doenças, avaliar a extensão das lesões e ajudar no controle evolutivo.The author reports the radiological findings in two siblings with mucopolysaccharidosis type VI (mucopolysaccharide VI. Conventional radiographs of the skeleton and magnetic resonance imaging examination of the central nervous system were performed. Skeletal abnormalities in patients with mucopolysaccharidosis type VI have already been well described by other authors and are generally similar to other mucopolysaccharides. Magnetic resonance imaging of the central nervous system may be helpful in the differential diagnosis, assessment of extension, and follow-up of these diseases.

  2. Extraction of Mo(VI) and U(VI) by alamine 310 and its mixtures from HCl solution

    International Nuclear Information System (INIS)

    Studies on the extraction of molybdenum(VI) and uranium(VI) from HCl solution by triisodecyl amine (Alamine 310), tri-n-butyl phosphate (TBP), di-n-pentylsulphoxide (DPSO) and their mixtures in benzene, in the range of 1-10 M aq. HCl, show that extractions are quantitative in most cases in the higher acidity range 6-8 M. Extraction by bis(2,4,4-trimethyl pentyl) dithiophosphinic acid (Cyanex 301) and its mixtures studied in the range of 0.2-1 M aq. HCl shows quantitative extraction for both the metals by Cyanex 301 and Alamine 310 mixtures only at lower acidity (∼0.2 M). The SCN- ion has a profound influence on the extraction of uranium(VI) by mixtures of 5% (v/v) Alamine 310 and 5% (v/v) TBP from 1 M HCl and the extraction is ∼95% at ∼0.2 M SCN- concentration. Synergism is marked in the extraction of molybdenum(VI) for the mixtures of Alamine 310 and TBP, Alamine 310 and Cyanex 301, and for uranium(VI), by mixtures of Alamine 310 and DPSO as well as Alamine 310 and Cyanex 301. (orig.)

  3. Committee VI.1. Extreme Hull Girder Loading

    DEFF Research Database (Denmark)

    Jensen, Jørgen Juncher

    2000-01-01

    Committee Mandate. Evaluate and develop direct calculation procedures for extreme wawe loads on ship hull girders. Due consideration shall be given to stochastic and non-linear effects. The procedures shall be assessed by comparison with in-service experiences, model tests and more refined...

  4. cromo (VI en cultivos primarios de neuronas y astrocitos de rata

    Directory of Open Access Journals (Sweden)

    V Uroz Martínez

    2008-01-01

    Full Text Available El presente estudio pretende comparar la concentración letal 50 (CL , dosis que causa la muerte del 50% de las células de 50 metilmercurio, cadmio (II y cromo (VI en cultivos primarios de corteza de rata. Se emplearon hemisferios cerebrales de rata para preparar los cultivos primarios. Los cultivos primarios de neuronas fueron realizados a partir de ratas Wistar de 14-16 días de gestación, usando el medio Eagle modificado por Dulbecco. Para los cultivos primarios de astrocitos se emplearon ratas de un día de vida y el medio de cultivo de Waymouth. Se emplearon las tinciones de azul de metileno y azul tripano para cuantificar la muerte neuronal mediante citometría. La CL para neuronas y astrocitos se calculó mediante el 50 método de Reed-Muench. En cultivos de 24 horas, la CL para las 50 -6 -6 neuronas fue de 5 x 10 M para el metilmercurio, 3,7 x 10 M para el -6 cadmio (II y 5,34 x 10 M para el cromo (VI. En el caso de los -5 astrocitos, las CL en los cultivos de 24 horas fue de 1,46 x 10 M para 50 -5 -5 el metilmercurio, 3,73 x 10 M para el cadmio (II y 2,46 x 10 M para el cromo (VI. Estos resultados muestran una resistencia diez veces mayor aproximadamente de los astrocitos con respecto a las neuronas para estos tres compuestos.

  5. Bio sorption process for uranium (VI) by using algae-yeast-silica gel composite adsorbent

    International Nuclear Information System (INIS)

    Many yeast, algae, bacteria and various aquatic flora are known to be capable of concentrating metal species from dilute aqueous solution. Many researcher have found that non-living biomaterials can be used to accumulate metal ions from environment. In recent studies, mainly two process are used in biosorption experiments. These are the use of free cells and the use of immobilized cells on a solid support. A variety of inert supports have been used to immobilize biomaterials either by adsorption or physical entrapment. This uptake is often considerable and frequently selective, and occurs via a variety of mechanisms including active transport, ion exchange or complexation, and adsorption or inorganic precipitation. Biosorbent may be used as an ion exchange material. Adsorption occurs through interaction of the metal ions with functional groups that are found in the cell wall biopolymers of either living or dead organisms. In this study, the algae-yeast-silica gel composite adsorbent was tested for its ability to recover U(VI) from diluted aqueous solutions. Macro marine algae (Jania rubens.), yeast (Saccharomyces cerevisiae) and silica gel were used to prepare composite adsorbent. The ability of the composite biosorbent to adsorb uranium (VI) from aqueous solution has been studied at different optimized conditions of pH, concentration of U(VI), temperature, contact time and matrix ion effect was also investigated. The adsorption patterns of uranium on the composite biosorbent were investigated by the Langmuir, Freundlich and Dubinin-Radushkhevic isotherms. The thermodynamic parameters such as variation of enthalpy ΔH, variation of entropy ΔS and variation of Gibbs free energy ΔG were calculated. The results suggested that the macro algae-yeast-silica gel composite sorbent is suitable as a new biosorbent material for removal of uranium ions from aqueous solutions

  6. 34 CFR Appendix B to Subpart B of... - Appendix I, Standards for Audit of Governmental Organizations, Programs, Activities, and...

    Science.gov (United States)

    2010-07-01

    ... 34 Education 3 2010-07-01 2010-07-01 false Appendix I, Standards for Audit of Governmental... Programs Pt. 668, Subpt. B, App. B Appendix B to Subpart B of Part 668—Appendix I, Standards for Audit of... in grant programs where authorizing agencies frequently want assurance in the auditor's report...

  7. Bethlem myopathy and engineered collagen VI triple helical deletions prevent intracellular multimer assembly and protein secretion.

    Science.gov (United States)

    Lamandé, S R; Shields, K A; Kornberg, A J; Shield, L K; Bateman, J F

    1999-07-30

    Mutations in the genes that code for collagen VI subunits, COL6A1, COL6A2, and COL6A3, are the cause of the autosomal dominant disorder, Bethlem myopathy. Although three different collagen VI structural mutations have previously been reported, the effect of these mutations on collagen VI assembly, structure, and function is currently unknown. We have characterized a new Bethlem myopathy mutation that results in skipping of COL6A1 exon 14 during pre-mRNA splicing and the deletion of 18 amino acids from the triple helical domain of the alpha1(VI) chain. Sequencing of genomic DNA identified a G to A transition in the +1 position of the splice donor site of intron 14 in one allele. The mutant alpha1(VI) chains associated intracellularly with alpha2(VI) and alpha3(VI) to form disulfide-bonded monomers, but further assembly into dimers and tetramers was prevented, and molecules containing the mutant chain were not secreted. This triple helical deletion thus resulted in production of half the normal amount of collagen VI. To further explore the biosynthetic consequences of collagen VI triple helical deletions, an alpha3(VI) cDNA expression construct containing a 202-amino acid deletion within the triple helix was produced and stably expressed in SaOS-2 cells. The transfected mutant alpha3(VI) chains associated with endogenous alpha1(VI) and alpha2(VI) to form collagen VI monomers, but dimers and tetramers did not form and the mutant-containing molecules were not secreted. Thus, deletions within the triple helical region of both the alpha1(VI) and alpha3(VI) chains can prevent intracellular dimer and tetramer assembly and secretion. These results provide the first evidence of the biosynthetic consequences of structural collagen VI mutations and suggest that functional protein haploinsufficiency may be a common pathogenic mechanism in Bethlem myopathy. PMID:10419498

  8. Mucopolysaccharidosis VI (Case Report Brain MRI and MR Spectroscopy Findings

    Directory of Open Access Journals (Sweden)

    Fuldem Donmez

    2013-10-01

    Full Text Available Mucopolysaccharidosis VI or Maroteaux-Lamy syndrome is an autosomal recessive lysosomal storage disorder with multisystem involvement which is determined by mutations in the arylsulfatase B (ARSB gene. Herein, we report the radiological findings of a case of Mucopolysaccharidosis VI which showed progression of periventricular lesions on follow-up magnetic resonance imaging (MRI and slight elevation of myoinositole and no other significant pathological peak on magnetic resonance (MR spectroscopy. MR spectroscopy as well as the clinical findings helped us to exclude some of the diseases in the differential diagnosis.

  9. Die Virtuelle Fachbibliothek Technik, ViFaTec

    OpenAIRE

    Bömeke, Martin

    2002-01-01

    Die Virtuelle Fachbibliothek Technik, ViFaTec wird kurz dargestellt. Die 5 Module, der Fachinformationsführer, die Suchmaschine Technik, die Metasuchmaschine, der Dokumentenlieferdienst TIBORDER und das Volltextsystem GetInfo werden erläutert. Über den derzeitigen Sachstand der ViFaTec, u.a. die Durchführung von Maßnahmen zur Bekanntmachung der Website wird berichtet. Die neue Suchmaschine Technik bzw. die Veränderungen bei der Suchmaschine Technik werden erläutert. Hier sind die Leistungsang...

  10. Mechanisms of U(VI) retention on montmorillonite and hectorite

    International Nuclear Information System (INIS)

    Complete text of publication follows: Introduction: Al- and Mg-smectites can retain significant amounts of U(VI) in soils, sediments, or glass weathered layers, and this sorption property can control the fate of this element in nuclear waste repositories. Possible retention mechanisms vary as a function of solution physico-chemical conditions, but also of the sorbate crystallo-chemistry. This study shows how distinct mechanisms can be observed for U(VI) sorption on montmorillonite and hectorite under similar conditions. Materials and methods: Suspensions of purified clay minerals (2 g/L hectorite or montmorillonite) were reacted in 0.5 M NaCl at pH 7.17 (hectorite) and 6.61 (montmorillonite) with 10 and 15 μM U(VI), respectively. Self-supporting films of reacted clay minerals were obtained by draining suspension aliquots on cellulose nitrate filters. Uranium L3-edge Polarized EXAFS (P-EXAFS) spectra of the self-supporting films were collected in fluorescence mode on the FAME beamline (ESRF, France). P-EXAFS data were reduced, and analyzed using standard procedures. Results and interpretation: Angular dependence of EXAFS spectra was observed for U(VI)-sorbed hectorite, but not montmorillonite. Sorbed U(VI) retained the uranyl conformation for both sorbates, with Oyl at 1.79 and 1.82 Angstroms on montmorillonite and hectorite, respectively. The equatorial Oeq shell was split in two subshells at 2.29 and 2.47 Angstroms for montmorillonite, and 2.35 and 2.53 Angstroms for hectorite, ruling out fully hydrated UO22+(aq). On montmorillonite, U(VI) was surrounded by ∼0.5 Al/Si at 3.30 Angstroms. This shell and the negligible angular dependence point to the formation of edge surface complexes, in line with previous studies [1, 2]. In contrast, for U(VI) on hectorite, only ∼0.2 Mg/Si near 3.2 Angstroms could be modelled, and no EXAFS contribution was observed beyond 3.6 Angstroms. This, and the significant spectral anisotropy suggest that U(VI) either sorbs to hectorite

  11. Dr. Lorenzo Dojmi Di Delupis - Viški "Gepard"

    OpenAIRE

    Jamnicki Dojmi, Mirko

    2011-01-01

    Dr. Lorenzo Dojmi di Delupis (1845.–1927.) odvjetak je ugledne viške grane plemićke obitelji Dojmi di Delupis. Sin je Petra Dojmija di Delupisa (1809.–1886.), pravnika, umjerenoga dalmatinskog autonomaša talijanske provenijencije, dugogodišnjega viškog načelnika i Margherite Siminiati. Kao tek završeni liječnik, s diplomom Medicinskog fakulteta u Grazu (1870.), Lorenzo Dojmi di Delupis krenuo je na dvogodišnji put kao liječnik turske vojske dospjevši čak do Bagdada i Basre. O toj dramatičnoj ...

  12. VI Congreso Universidad y Cooperación al Desarrollo

    OpenAIRE

    Universitat Politècnica de València - Centro de Cooperación al Desarrollo

    2013-01-01

    La presente publicación recoge los trabajos presentados al VI Congreso Universidad y Cooperación para el Desarrollo, celebrado en Valencia. El congreso está organizado por el Comité Universitario Valenciano de Relaciones internacionales y Cooperación, que integra a las cinco universidades valencianas Universitat Politècnica de València - Centro de Cooperación al Desarrollo (2013). VI Congreso Universidad y Cooperación al Desarrollo. Editorial Universitat Politècnica de València. http://hdl...

  13. Neutron cross section standards evaluations for ENDF/B-VI

    International Nuclear Information System (INIS)

    The neutron cross section standards are now being evaluated as the initial phase in the development of the new ENDF/B-VI file. These standards evaluations are following a somewhat different process compared with that used for earlier versions of ENDF. The primary effort is concentrated on a simultaneous evaluation using a generalized least squares program, R-matrix evaluations, and a procedure for combining the results of these evaluations. The ENDF/B-VI standards evaluation procedure is outlined, and preliminary simultaneous evaluation and R-matrix results are presented. 16 refs., 7 figs

  14. Apollonius de Perge, Coniques tome 4, livres VI et VII

    CERN Document Server

    Rashed, Roshdi

    2009-01-01

    Book VI of the Konika is essentially devoted to the question of the identity and similarity of two conic sections, or two parts of conic sections. In Book VII Apollonius deals with the various relationships between the lengths of diameters and conjugate diameters. The results are applied to the exposition of a number of problems, as well as to some problems which Apollonius indicates will be demonstrated and solved in Book VIII, which was lost in Antiquity. Books VI and VII have only survived in an Arabic translation, and are presented here in a critical edition, together with a faithful trans

  15. Benchmark calculations of 150-group cross section library for LMR's

    International Nuclear Information System (INIS)

    For the purpose of diversification of selection of cross section library for neutron calculation of LMR, the 150 multi-group cross section library was generated from ENDF-VI release. The set was then examined by analyzing measured reactivity quantities such as control rod worth, Doppler effect and sodium void effect for BFS critical assemblies that we obtained through the critical experiment plan for developing the KALIMER core design. The calculated results based on 9 group structure using the new set were also compared with those of JEF set based on the same group structure and compared with those of the same set based on 25 group structure to find the proper group structure. ENDF-VI-based set shows a small deviation in predicting measured integral quantities in comparison with the previous set and a small group effect

  16. Selectivity enhancement of phosphate based functional polymeric gels towards Uranium(VI) using ion imprinting

    International Nuclear Information System (INIS)

    The imprinting of gel containing polymer chains of ethylene glycol methacrylate phosphate (EGMP) for U(VI) ions were carried out. The U(VI) imprinting has been carried out in pure EGMP and in EGMP: poly(ethylene glycol) methacrylate (PEGMA) = 1:9 composition. Complexation of the monomer with template (U(VI)) followed by polymerization have been used to imprint the U(VI) onto the polymer chains. The comparison of uptake studies of U(VI) and Pu(IV) at 3 M HNO3 shows increased selectivity of U(VI) relative to Pu(IV) for both the gel compositions. The less uptake of U(VI) for imprinted EGMP:PEGMA gel relative to pure imprinted EGMP gel at tracer level can be possibly due to the requirement of two EGMP units in the vicinity for U(VI) complexation. (author)

  17. Fe(III), Cr(VI), and Fe(III) mediated Cr(VI) reduction in alkaline media using a Halomonas isolate from Soap Lake, Washington.

    Science.gov (United States)

    VanEngelen, Michael R; Peyton, Brent M; Mormile, Melanie R; Pinkart, Holly C

    2008-11-01

    Hexavalent chromium is one of the most widely distributed environmental contaminants. Given the carcinogenic and mutagenic consequences of Cr(VI) exposure, the release of Cr(VI) into the environment has long been a major concern. While many reports of microbial Cr(VI) reduction are in circulation, very few have demonstrated Cr(VI) reduction under alkaline conditions. Since Cr(VI) exhibits higher mobility in alkaline soils relative to pH neutral soils, and since Cr contamination of alkaline soils is associated with a number of industrial activities, microbial Cr(VI) reduction under alkaline conditions requires attention.Soda lakes are the most stable alkaline environments on earth, and contain a wide diversity of alkaliphilic organisms. In this study, a bacterial isolate belonging to the Halomonas genus was obtained from Soap Lake, a chemically stratified alkaline lake located in central Washington State. The ability of this isolate to reduce Cr(VI) and Fe(III) was assessed under alkaline (pH = 9), anoxic, non-growth conditions with acetate as an electron donor. Metal reduction rates were quantified using Monod kinetics. In addition, Cr(VI) reduction experiments were carried out in the presence of Fe(III) to evaluate the possible enhancement of Cr(VI) reduction rates through electron shuttling mechanisms. While Fe(III) reduction rates were slow compared to previously reported rates, Cr(VI) reduction rates fell within range of previously reported rates. PMID:18401687

  18. The effectiveness of four organic matter amendments for decreasing resin-extractable Cr(VI) in Cr(VI)-contaminated soils.

    Science.gov (United States)

    Chiu, Chien-Chih; Cheng, Chia-Jung; Lin, Tzu-Huei; Juang, Kai-Wei; Lee, Dar-Yuan

    2009-01-30

    This paper compared the effectiveness of four organic materials for decreasing the amounts of soil extractable Cr(VI) in Cr(VI)-contaminated soils using the DOWEX M4195 resin-extraction method. Organic matters were added into Cr(VI)-spiked soils [500 mg Cr(VI)(kgsoil)(-1)] in the form of sugarcane dregs compost (SCDC), cattle-dung compost (CDC), soybean meal (SBM) and rice bran (RB), in the amounts of 0, 1%, and 2% by dry weight, respectively. The results indicated that adding only 1% organic matter to the studied soils could effectively decrease the amount of soil resin-extractable Cr(VI) after 12 days of incubation. The decrease of resin-extractable Cr(VI) by organic materials was mainly the result from the reduction of Cr(VI) to Cr(III) supported by the XANES spectroscopy. Among the four tested organic materials, SBM and RB had higher effectiveness in decreasing soil resin-extractable Cr(VI) than CDC and SCDC. This result may be due to the fact that SBM and RB have more dissolved organic carbon (DOC) and protein than CDC and SCDC. Therefore, it was concluded that the contents of DOC and protein are the main factors that determine the effectiveness of organic materials for decreasing the amounts of soil available Cr(VI) in Cr(VI)-contaminated soils. PMID:18524481

  19. Counter-current extraction and separation of U(VI) from a mixture of U(VI)-Th(IV)-Y(III) using tris-2-ethyl hexyl phosphate (TEHP)

    International Nuclear Information System (INIS)

    Evaluation of tris-2-ethyl hexyl phosphate (TEHP) for counter-current extraction and separation of U(VI) from a mixture of U(VI)-Th(IV)-Y(III) from nitric acid medium was carried out under wide experimental conditions. Batch extraction studies were carried out to investigate the effect of nitric acid concentration in feed solution, U(VI)/Th(IV) ratio and extractant concentration and the results were compared with established solvent such as tri-n-butyl phosphate (TBP) for separation of U(VI) from nitric acid medium. McCabe-Thiele diagrams for extraction as well as stripping of U(VI) were constructed under simulated conditions. Based on batch experiments, six stage counter-current extraction studies were conducted under various TEHP concentration and it was observed that 0.1 M TEHP/n-paraffin was most suitable for selective recovery of U(VI) from a mixture of U(VI)-Th(IV). An optimized condition, 0.1 M TEHP/n-paraffin, 2 M HNO3 in feed and six number of stages was evaluated for selective extraction and stripping of U(VI) from a solution containing mixture of U(VI)-Th(IV)-Y(III) in nitric acid medium. The U(VI) in strip solution was precipitated using 30 % H2O2 at pH ∼3. Average particle size of the final precipitate was found to be ∼33 μm. (author)

  20. Adsorption Properties of Bentonite with In Situ Immobilized Polyaniline Towards Anionic Forms of Cr(VI), Mo(VI), W(VI), V(V)

    OpenAIRE

    Kateryna RYABCHENKO; Elina YANOVSKA; Mariya MELNYK; Dariusz STERNIK; Olga KYCHKIRUK; Valentun TERTYKH

    2016-01-01

    A new composite material bentonite-PANI was synthesized by in situ immobilization of polyaniline (PANI) on the surface of natural mineral bentonite. It was established as a result of the modification of bentonite a surface area and an interlayer distance of mineral decrease and particles of bentonite transformed of irregular shape with different porosity on irregularly shaped particles of smaller size. It has been found that the total Cr(VI) ions extraction took place under the acid condition...

  1. DIST: a computer code system for calculation of distribution ratios of solutes in the purex system

    Energy Technology Data Exchange (ETDEWEB)

    Tachimori, Shoichi [Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Tokai Research Establishment

    1996-05-01

    Purex is a solvent extraction process for reprocessing the spent nuclear fuel using tri n-butylphosphate (TBP). A computer code system DIST has been developed to calculate distribution ratios for the major solutes in the Purex process. The DIST system is composed of database storing experimental distribution data of U(IV), U(VI), Pu(III), Pu(IV), Pu(VI), Np(IV), Np(VI), HNO{sub 3} and HNO{sub 2}: DISTEX and of Zr(IV), Tc(VII): DISTEXFP and calculation programs to calculate distribution ratios of U(IV), U(VI), Pu(III), Pu(IV), Pu(VI), Np(IV), Np(VI), HNO{sub 3} and HNO{sub 2}(DIST1), and Zr(IV), Tc(VII)(DITS2). The DIST1 and DIST2 determine, by the best-fit procedures, the most appropriate values of many parameters put on empirical equations by using the DISTEX data which fulfill the assigned conditions and are applied to calculate distribution ratios of the respective solutes. Approximately 5,000 data were stored in the DISTEX and DISTEXFP. In the present report, the following items are described, 1) specific features of DIST1 and DIST2 codes and the examples of calculation 2) explanation of databases, DISTEX, DISTEXFP and a program DISTIN, which manages the data in the DISTEX and DISTEXFP by functions as input, search, correction and delete. and at the annex, 3) programs of DIST1, DIST2, and figure-drawing programs DIST1G and DIST2G 4) user manual for DISTIN. 5) source programs of DIST1 and DIST2. 6) the experimental data stored in the DISTEX and DISTEXFP. (author). 122 refs.

  2. Effect of high ionic strength on the extraction of uranium(VI ions

    Directory of Open Access Journals (Sweden)

    M.K. Nazal

    2014-01-01

    Full Text Available Preparation and characterization of didodecylphosphoric acid (HDDPA as an extractant in toluene was carried. Mass spectroscopy showed that the monomer peak at 457.4 amu [M–Na+] is double that of the dimer at 891.9 amu [M–M–Na+] and the monomer molecules concentration dominate the dimer molecules in toluene. HDDPA was used as an extractant for the extraction of U(VI ion from perchlorate and nitrate media that have ionic strength (1.00, 3.00, 5.00, 7.00 M. The effect of HDDPA concentration, pcH, ionic strength of supporting electrolytes, and temperature in the range 15–45 °C on the extraction process have been studied. The stoichiometry of the extraction of U(VI ion, the free energy change (ΔG, the enthalpy change (ΔH, the entropy change (ΔS, and Kex at different ionic strength have been calculated. The formula of the complexes, which were formed has been established to be UO2(X(R2(HR2 at pcH equal 2.00 and UO2(X(R2(HR2 and UO2(X(R2 at pcH = 1.00, where (X isClO4- orNO3- and (HR2 is didodecylphosphoric acid monomer, (R2 is the deprotonated didodecylphosphoric acid, where R is the dodecyl group.

  3. Uranium (VI)Bis(imido) chalcogenate complexes:synthesis and density functional theory analysis

    International Nuclear Information System (INIS)

    Bis(imido) uranium(VI) trans- and cis-dichalcogenate complexes with the general formula U(NtBu)2(EAr)2(OPPh3)2 (EAr = O-2-tBuC6H4, SPh, SePh, TePh) and U(NtBu)2(EAr)2(R2bpy) (EAr = SPh, SePh, TePh) (R2bpy = 4,4'-disubstituted-2,2'-bipyridyl, R = Me, tBu) have been prepared. This family of complexes includes the first reported monodentate selenolate and tellurolate complexes of uranium(VI). Density functional theory calculations show that covalent interactions in the U-E bond increase in the trans-dichalcogenate series U(NtBu)2(EAr)2(OPPh3)2 as the size of the chalcogenate donor increases and that both 5f and 6d orbital participation is important in the M-E bonds of U-S, U-Se, and U-Te complexes.

  4. Extraction of Uranium (VI) Nitrate Complexes By Adogen 464. Vol. 3

    International Nuclear Information System (INIS)

    Long-chain amines are frequently used for the extraction of actinides and offer several advantages for their use in the reprocessing of high burn-up nuclear fuels. The present investigation was undertaken to obtain some information on the extraction of Uranium (VI)by adogen 464 from nitrate medium. Extraction parameters studied include: acidity, salting agent, metal and extractant concentrations, diluent type, and temperature. Extraction mechanism was proposed on the basis of results obtained. Best results were attained at 6 M H N O3 and sodium nitrate was found to increase appreciably the extraction. It was infrared that extraction was dominated by solvation, and ion exchange reaction mechanisms at lower (<6 M) and higher acidities, respectively. As far as diluents are concerned, the dielectric constant, solvation power and donor characteristics were used to explain the variation in the extraction efficiency of the diluents. Kerosene, the most economic particularly when used on industrial scale, was recommended as optimal diluent. Extractability decreases markedly with rise of temperature, suggesting that the extraction behaviour is exothermic; the thermodynamic functions were also calculated and discussed. A method for the separation of uranium (VI) from some fission products existing in high liquid waste was outlined. 3 figs., 2 tabs

  5. Uranium (VI)Bis(imido) chalcogenate complexes:synthesis and density functional theory analysis

    Energy Technology Data Exchange (ETDEWEB)

    Spencer, Liam P [Los Alamos National Laboratory; Batista, Enrique R [Los Alamos National Laboratory; Boncella, James M [Los Alamos National Laboratory; Yang, Ping [Los Alamos National Laboratory; Scott, Brian L [Los Alamos National Laboratory

    2009-01-01

    Bis(imido) uranium(VI) trans- and cis-dichalcogenate complexes with the general formula U(NtBu)2(EAr)2(OPPh3)2 (EAr = O-2-tBuC6H4, SPh, SePh, TePh) and U(NtBu)2(EAr)2(R2bpy) (EAr = SPh, SePh, TePh) (R2bpy = 4,4'-disubstituted-2,2'-bipyridyl, R = Me, tBu) have been prepared. This family of complexes includes the first reported monodentate selenolate and tellurolate complexes of uranium(VI). Density functional theory calculations show that covalent interactions in the U-E bond increase in the trans-dichalcogenate series U(NtBu)2(EAr)2(OPPh3)2 as the size of the chalcogenate donor increases and that both 5f and 6d orbital participation is important in the M-E bonds of U-S, U-Se, and U-Te complexes.

  6. Interactions of U(VI) with cement alteration products in highly saline solutions

    International Nuclear Information System (INIS)

    The retention of radionuclides in a repository system for cemented low and intermediate level waste (LLW / ILW) strongly depends on the interaction of the cement products with potentially contacting solutions. The present study focuses on interaction of LLW simulates with MgCl2-rich brines and the consecutive U(VI) release, which are relevant to final disposal of LLW / ILW in German rock salt formations. Results of corrosion experiments with full-scale LLW simulates, conducted for more than 20 years, and of laboratory experiments with cement products are combined with thermodynamic simulations. Aqueous U concentrations in the studied systems are solubility controlled and significantly lower than those reported in literature for dilute cementitious systems. In corroded LLW simulate samples U(VI) rich aggregates with a size of > 20 μm have diuranate like structure according to Raman micro-spectroscopy. Thermodynamic simulations are in agreement with experimentally determined pH and Ca, Mg, Na, K, Cl- and SO42- concentrations. Measured U concentrations match both calculated solubilities of diuranate and uranophane. (authors)

  7. Adsorption Properties of Bentonite with In Situ Immobilized Polyaniline Towards Anionic Forms of Cr(VI, Mo(VI, W(VI, V(V

    Directory of Open Access Journals (Sweden)

    Kateryna RYABCHENKO

    2016-05-01

    Full Text Available A new composite material bentonite-PANI was synthesized by in situ immobilization of polyaniline (PANI on the surface of natural mineral bentonite. It was established as a result of the modification of bentonite a surface area and an interlayer distance of mineral decrease and particles of bentonite transformed of irregular shape with different porosity on irregularly shaped particles of smaller size. It has been found that the total Cr(VI ions extraction took place under the acid conditions (pH=1 – 2 and W(VI ions have been well adsorbed in the pH range from 1 to 8 by the composite bentonite-PANI unlike the initial mineral. Whereas adsorption of oxo anions of V(V and Mo(VI made up some 50%. It is proved that the in situ immobilization of bentonite by polyaniline leads to increasing the value of adsorption capacity towards the investigated ions compared with the initial mineral. It was established that the adsorption properties of the synthesized composite with respect to the studied oxo ions were worse than the adsorption properties of composite vermiculite-PANI, similar to the composite Sokyryntsyy clinoptilolite-PANI and better than composites of polyaniline with Podilskyy saponite and Karelian shungite.DOI: http://dx.doi.org/10.5755/j01.ms.22.2.6976

  8. Targeted disruption of the arylsulfatase B gene results in mice resembling the phenotype of mucopolysaccharidosis VI.

    OpenAIRE

    Evers, M.; Saftig, P.; Schmidt, P.; Hafner, A.; McLoghlin, D B; Schmahl, W; Hess, B; von Figura, K; Peters, C.

    1996-01-01

    Mucopolysaccharidosis VI (MPS VI) is a lysosomal storage disease with autosomal recessive inheritance caused by a deficiency of the enzyme arylsulfatase B (ASB), which is involved in degradation of dermatan sulfate and chondroitin 4-sulfate. A MPS VI mouse model was generated by targeted disruption of the ASB gene. Homozygous mutant animals exhibit ASB enzyme deficiency and elevated urinary secretion of dermatan sulfate. They develop progressive symptoms resembling those of MPS VI in humans. ...

  9. Distribution of type VI collagen expression in synovial tissue and cultured synoviocytes: relation to fibronectin expression.

    OpenAIRE

    Wolf, J; Carsons, S E

    1991-01-01

    Type VI collagen has recently been shown to be an important component of connective tissue. Double label immunofluorescence procedures were used to immunolocalize type VI collagen in normal and rheumatoid synovium and its distribution was compared with that of fibronectin. In normal synovium type VI collagen is expressed in the synovial membrane but not in the interstitium of the villus. In rheumatoid synovium, however, type VI collagen is extensively deposited in both the interstitial connec...

  10. Cr(VI) speciation in foods by HPLC-ICP-MS: investigation of Cr(VI)/food interactions by size exclusion and Cr(VI) determination and stability by ion-exchange on-line separations.

    Science.gov (United States)

    Vacchina, Véronique; de la Calle, Inmaculada; Séby, Fabienne

    2015-05-01

    A method has been developed for the specific and sensitive determination of Cr(VI) in foods. First, the interactions between Cr(VI) and the matrices were investigated by size-exclusion HPLC-ICP-MS (SEC-ICP-MS). Evidence was found for the complexation of Cr(VI) potentially present with the ligands. For quantification of Cr(VI), the method was based on an alkaline extraction (NH4OH solution at pH 11.5) followed by Cr(VI) determination by anion-exchange HPLC-ICP-MS. Analytical performances of the method were satisfactory in terms of linearity, specificity, accuracy, repeatability, and intermediate precision. Detection limits ranged from 1 to 10 μg/kg, depending on the matrices investigated. The method was then applied for the determination of Cr(VI) in several products (dairy products, flour, chocolate, vegetables, fruits, meat, fish, eggs, and beverages) from different brands and origins. Cr(VI) was found in none of the samples investigated. To further investigate the reason for this absence, a stability study of spiked Cr(VI) was therefore conducted. A semi-skimmed cow milk was selected for this study. Cr(VI) was shown to be unstable in this matrix with a degradation rate increasing with the temperature. PMID:25772568

  11. Laboratory Evaluation of In Situ Chemical Oxidation for Groundwater Remediation, Test Area North, Operable Unit 1-07B, Idaho National Engineering and Environmental Laboratory, Volume Four - Appendix G

    Energy Technology Data Exchange (ETDEWEB)

    Cline, S.R.; Denton, D.L.; Giaquinto, J.M.; McCracken, M.K.; Starr, R.C.

    1999-04-01

    This appendix supports the results and discussion of the laboratory work performed to evaluate the feasibility of in situ chemical oxidation for Idaho National Environmental and Engineering Laboratory's (INEEL) Test Area North (TAN) which is contained in ORNL/TM-13711/V1. This volume contains Appendix G. Appendix G is a presentation of VOC chromatography data collected during the study. Information on the calibration curves and calibration checks used as well as the sample GC reports themselves are included here. The concentration values presented on the GC reports are calculation using the data from the applicable calibration curve and any necessary dilutions which were made.

  12. Stellar laboratories. V. The Xe VI ultraviolet spectrum and the xenon abundance in the hot DO-type white dwarf RE0503-289

    CERN Document Server

    Rauch, T; Quinet, P; Gallardo, M; Raineri, M

    2015-01-01

    For the spectral analysis of high-resolution and high-signal-to-noise (S/N) spectra of hot stars, state-of-the-art non-local thermodynamic equilibrium (NLTE) model atmospheres are mandatory. These are strongly dependent on the reliability of the atomic data that is used for their calculation. Reliable Xe VI oscillator strengths are used to identify Xe lines in the ultraviolet spectrum of the DO-type white dwarf RE0503-289 and to determine its photospheric Xe abundance. Based on a recently measured Xe VI laboratory line spectrum, newly calculated oscillator strengths were published. These were used to consider their radiative and collisional bound-bound transitions in detail in our NLTE stellar-atmosphere models for the analysis of Xe VI lines exhibited in high-resolution and high-S/N UV observations of RE0503-289. We identified three hitherto unknown Xe VI lines in the ultraviolet spectrum of RE0503-289 and confirmed its previously measured photospheric Xe abundance (-4.2 +/- 0.6 by mass). Reliable measuremen...

  13. AM(VI) PARTITIONING STUDIES: FY14 FINAL REPORT

    Energy Technology Data Exchange (ETDEWEB)

    Bruce J Mincher

    2014-10-01

    The use of higher oxidation states of americium in partitioning from the lanthanides is under continued investigation by the sigma team. This is based on the hypothesis that Am(VI) can be produced and remain stable in irradiated first cycle raffinate solution long enough to perform solvent extraction for separations. The stability of Am(VI) to autoreduction was measured using millimolar americium concentrations in a 1-cm cell with a Cary 6000 UV/Vis spectrophotometer for data acquisition. At millimolar americium concentrations, Am(VI) is stable enough against its own autoreduction for separations purposes. A second major accomplishment during FY14 was the hot test. Americium oxidation and extraction was performed using a centrifugal contactor-based test bed consisting of an extraction stage and two stripping stages. Sixty-three percent americium extraction was obtained in one extraction stage, in agreement with batch contacts. Promising electrochemical oxidation results have also been obtained, using terpyridine ligand derivatized electrodes for binding of Am(III). Approximately 50 % of the Am(III) was oxidized to Am(V) over the course of 1 hour. It is believed that this is the first demonstration of the electrolytic oxidation of americium in a non-complexing solution. Finally, an initial investigation of Am(VI) extraction using diethylhexylbutyramide (DEHBA) was performed.

  14. ViPiA: A Project for European Entrepreneurship

    Science.gov (United States)

    Folinas, Dimitris; Manthou, Vicky; Vlachopoulou, Maro

    2006-01-01

    The Virtual Pre-Incubator Accelerator (ViPiA) is a two-year project funded by the European Commission. The main goal of the programme is to create a training package for would-be entrepreneurs to assist them in developing their new venture concepts to a level at which they become attractive to potential investors. This paper describes and…

  15. Chromatographic separation of Te(IV) and Te(VI)

    International Nuclear Information System (INIS)

    Valence separation of Te(IV) from Te(VI) by circular paper chromatography employing a number of solvent systems including pyridine is described. The differential migrations of the two ions are explained on the basis of differential solubilization, complexation and precipitation. The separated ions are estimated polarographically. (author)

  16. Vi har beskæftigelseskrise, ikke uddannelseskrise

    DEFF Research Database (Denmark)

    Grindsted, Thomas Skou; Skou Grindsted, Louise

    2014-01-01

    Universiteterne er for dårlige, og kandidaternes kompetencer er forkerte, derfor ender mange i arbejdsløshed, mener Danmarks Akkrediteringsinstitution, Produktivitetskommissionen og DI. Men for få år siden var der mangel på højtuddannet arbejdskraft, så måske har vi et beskæftigelsesproblem snare...

  17. Synthesis and characterization of uranium(VI) chloride fluorides

    International Nuclear Information System (INIS)

    Uranium (VI) chloride fluorides were synthesized by the reaction of liquid HCl and solid UF6 between -80 and -114 deg C. These dark red compounds are unstable above -40 to -60 deg C. The simplest formulas derived from compositional analysis are UF5Cl and UF4Cl2. (author)

  18. vi-Strauss, Caduveo Body Painting and the Readymade

    DEFF Research Database (Denmark)

    Wiseman, Boris Nicholas Daniel

    2008-01-01

    of various forms of avant-garde art, from Duchamp's readymades, to Anthony Caro's abstract sculptures and assemblages by the Nouveau Réaliste artist Arman.  Although these forms of art would no doubt constitute, for Lévi-Strauss, instances of what he calls, pejoratively, an ‘academism of the...

  19. Chemistry of the Colloidal Group II-VI Nanocrystal Synthesis

    Energy Technology Data Exchange (ETDEWEB)

    Liu, Haitao

    2007-05-17

    In the last two decades, the field of nanoscience andnanotechnology has witnessed tremendous advancement in the synthesis andapplication of group II-VI colloidal nanocrystals. The synthesis based onhigh temperature decomposition of organometallic precursors has becomeone of the most successful methods of making group II-VI colloidalnanocrystals. This method is first demonstrated by Bawendi and coworkersin 1993 to prepare cadmium chalcogenide colloidal quantum dots and laterextended by others to prepare other group II-VI quantum dots as well asanisotropic shaped colloidal nanocrystals, such as nanorod and tetrapod.This dissertation focuses on the chemistry of this type of nanocrystalsynthesis. The synthesis of group II-VI nanocrystals was studied bycharacterizing the molecular structures of the precursors and productsand following their time evolution in the synthesis. Based on theseresults, a mechanism was proposed to account for the 2 reaction betweenthe precursors that presumably produces monomer for the growth ofnanocrystals. Theoretical study based on density functional theorycalculations revealed the detailed free energy landscape of the precursordecomposition and monomerformation pathway. Based on the proposedreaction mechanism, a new synthetic method was designed that uses wateras a novel reagent to control the diameter and the aspect ratio of CdSeand CdS nanorods.

  20. Chemistry of the Colloidal Group II-VI Nanocrystal Synthesis

    Energy Technology Data Exchange (ETDEWEB)

    Liu, Haitao

    2007-05-17

    In the last two decades, the field of nanoscience andnanotechnology has witnessed tremendous advancement in the synthesis andapplication of group II-VI colloidal nanocrystals. The synthesis based onhigh temperature decomposition of organometallic precursors has becomeone of the most successful methods of making group II-VI colloidalnanocrystals. This methodis first demonstrated by Bawendi and coworkersin 1993 to prepare cadmium chalcogenide colloidal quantum dots and laterextended by others to prepare other group II-VI quantum dots as well asanisotropic shaped colloidal nanocrystals, such as nanorod and tetrapod.This dissertation focuses on the chemistry of this type of nanocrystalsynthesis. The synthesis of group II-VI nanocrystals was studied bycharacterizing the molecular structures of the precursors and productsand following their time evolution in the synthesis. Based on theseresults, a mechanism was proposed to account for the 2 reaction betweenthe precursors that presumably produces monomer for the growth ofnanocrystals. Theoretical study based on density functional theorycalculations revealed the detailed free energy landscape of the precursordecomposition and monomerformation pathway. Based on the proposedreaction mechanism, a new synthetic method was designed that uses wateras a novel reagent to control the diameter and the aspect ratio of CdSeand CdS nanorods.

  1. ENDF-201: ENDF/B-VI summary documentation

    International Nuclear Information System (INIS)

    Responsibility for oversight of the ENDF/B Evaluated Nuclear Data file lies with the Cross Section Evaluation Working Group (CSEWG), which is comprised of representatives from various governmental and industrial laboratories in the United States. Individual evaluations are provided by scientists at several US laboratories, including significant contributions by scientists from all over the world. In addition, ENDF/B-VI includes for the first time complete evaluations for three materials that were provided from laboratories outside the US. All data are checked and reviewed by CSEWG, and the data file is maintained and issued by the National Nuclear Data Center at Brookhaven National Laboratory. The previous version of the library, ENDF/B-V, was issued in 1979, and two revisions to the data file were provided in subsequent years, the latest occurring in 1981. A total of 75 new or extensively modified neutron sublibrary evaluations are included in ENDF/B-VI, and are summarized in this document. One incident proton sublibrary is described for Fe56. The remaining evaluations in ENDF/B-VI have been carried over from earlier versions of ENDF, and have been updated to reflect the new formats. The release of ENDF/B-VI was carried out between January and June of 1990, with groups of materials being released on ''tapes.'' Table 1 is an index to the evaluation summaries, and includes the material identification or MAT number, the responsible laboratory, and the ''tape'' number. These evaluations have been released without restrictions on their distribution or use

  2. Museu del vi de Vilafranca del Penedès

    OpenAIRE

    Soler Solà, Jordi

    2006-01-01

    Ampliació del Museu del Vi de Vilafranca per tal que es doti d'eines, de recursos i de programes que li permetin adquirir una identitat pròpia i treballar en les funcions que li han de ser pròpies: la conservació, la recerca i la restitució del coneixement a la ciutadania.

  3. Osteogenesis Imperfecta Type VI in Individuals from Northern Canada.

    Science.gov (United States)

    Ward, Leanne; Bardai, Ghalib; Moffatt, Pierre; Al-Jallad, Hadil; Trejo, Pamela; Glorieux, Francis H; Rauch, Frank

    2016-06-01

    Osteogenesis imperfecta (OI) type VI is a recessively inherited form of OI that is caused by mutations in SERPINF1, the gene coding for pigment-epithelium derived factor (PEDF). Here, we report on two apparently unrelated children with OI type VI who had the same unusual homozygous variant in intron 6 of SERPINF1 (c.787-10C>G). This variant created a novel splice site that led to the in-frame addition of three amino acids to PEDF (p.Lys262_Ile263insLeuSerGln). Western blotting showed that skin fibroblasts with this mutation produced PEDF but failed to secrete it. Both children were treated with intravenous bisphosphonates, but the treatment of Individual 1 was switched to subcutaneous injections of denosumab (dose 1 mg per kg body weight, repeated every 3 months). An iliac bone sample obtained after 5 denosumab injections (and 3 months after the last injection) showed no change in the increased osteoid parameters that are typical of OI type VI, but the number of osteoclasts in trabecular bone was markedly increased. This suggests that the effect of denosumab on osteoclast suppression is of shorter duration in children with OI type VI than what has previously been reported on adults with osteoporosis. PMID:26815784

  4. Selective Chromium(VI) Ligands Identified Using Combinatorial Peptoid Libraries

    Science.gov (United States)

    Knight, Abigail S.; Zhou, Effie Y.; Pelton, Jeffrey G.; Francis, Matthew B.

    2013-01-01

    Hexavalent chromium (Cr(VI)) is a world-wide water contaminant that is currently without cost-effective and efficient remediation strategies. This is in part due to a lack of ligands that can bind it amid an excess of innocuous ions in aqueous solution. We present herein the design and application of a peptoid-based library of ligand candidates for toxic metal ions. A selective screening process was used to identify members of the library that can bind to Cr(VI) species at neutral pH and in the presence of a large excess of spectator ions. Eleven sequences were identified, and their affinities were compared using titrations monitored with UV-Vis spectroscopy. To identify the interactions involved in coordination and specificity, we evaluated the effects of sequence substitutions and backbone variation in the highest affinity structure. Additional characterization of the complex formed between this sequence and Cr(VI) was performed using NMR spectroscopy. To evaluate the ability of the developed sequences to remediate contaminated solutions, the structures were synthesized on a solid-phase resin and incubated with environmental water samples that contained simulated levels of chromium contamination. The synthetic structures demonstrated the ability to reduce the amount of toxic chromium to levels within the range of the EPA contamination guidelines. In addition to providing some of the first selective ligands for Cr(VI), these studies highlight the promise of peptoid sequences as easily-prepared components of environmental remediation materials. PMID:24195610

  5. 14 CFR Appendix F to Part 151 - Appendix F to Part 151

    Science.gov (United States)

    2010-01-01

    ...) AIRPORTS FEDERAL AID TO AIRPORTS Pt. 151, App. F Appendix F to Part 151 There is set forth below an.... Transformer or generator vaults. 11. Control panels for field lighting. 12. Control equipment for...

  6. Investigations on photoelectrocatalytic reduction of Cr(VI) over titanium dioxide anode and metal cathode

    International Nuclear Information System (INIS)

    Photocatalytic and photoelectrocatalytic (PEC) reductions of Cr(VI) based on TiO2 thin films were investigated under various conditions. Photogenerated electrons transferred from TiO2 thin film to cathode can contribute to PEC reduction of Cr(VI) only when the Fermi level of cathode lies above the chemical potential of Cr(VI), almost independent on the applied voltage of the direct current. In addition, the TiO2-coated anode is the major site that accommodates the PEC reduction of Cr(VI) with hole scavenger citric acid, regardless of the Fermi level of the cathode. Although electron transfer from TiO2 to Cr(VI) is an exothermic process, the photogenerated holes in TiO2 can markedly hamper Cr(VI) reduction over the TiO2 thin film by oxidizing the lower-valence Cr back to Cr(VI), which may be counteracted by the citric acid. This research provides some in-depth insights on developing photocatalysts which enable highly efficient PEC reduction of Cr(VI) in the future. - Highlights: • Cr(VI) reduction on TiO2 photoanode is dominant with the addition of citric acid. • Cr(VI) is reduced on photocathode with Fermi level above Cr(VI) chemical potential. • Photogenerated holes can hamper Cr(VI) photoreduction over TiO2

  7. Synergetic Transformations of Multiple Pollutants Driven by Cr(VI)-Sulfite Reactions.

    Science.gov (United States)

    Jiang, Bo; Liu, Yukun; Zheng, Jingtang; Tan, Minghui; Wang, Zhaohui; Wu, Mingbo

    2015-10-20

    Reduction of Cr(VI) is often deemed necessary to detoxify chromium contaminants; however, few investigations utilized this reaction for the purpose of treating other industrial wastewaters. Here a widely used Cr(VI)-sulfite reaction system was upgraded to simultaneously transform multiple pollutants, namely, the reduction of Cr(VI) and oxidation of sulfite and other organic/inorganic pollutants in an acidic solution. As(III) was selected as a probe pollutant to examine the oxidation capacity of a Cr(VI)-sulfite system. Both (•)OH and SO4(•-) were considered as the primary oxidants for As(III) oxidation, based on the results of electron spin resonance, fluorescence spectroscopy, and specific radicals quenching. As(III)-scavenging, oxidative radicals greatly accelerated Cr(VI) reduction and simultaneously consumed less sulfite. In comparison with a Cr(VI)-H2O2 system with 50 μM Cr(VI), Cr(VI), the sulfite system had excellent performance for both As(III) oxidation and Cr(VI) reduction at pH 3.5. Moreover, in this escalated process, less sulfite was required to reduce Cr(VI) than the traditional Cr(VI) reduction by sulfite process. This effectively improves the environmental compatibility of this Cr(VI) detoxification process, alleviating the potential for SO2 release and sulfate ion production in water. Generally, this study provides an excellent example of a "waste control by waste" strategy for the detoxification of multiple industrial pollutants. PMID:26384045

  8. Characterization of ZrP{sub 2}O{sub 7} modified with oxalic acid and thermodynamic analysis associated to the uranyl (Vi) sorption; Caracterizacion de ZrP{sub 2}O{sub 7} modificado con acido oxalico y analisis termodinamico asociado a la sorcion de uranilo (VI)

    Energy Technology Data Exchange (ETDEWEB)

    Garcia G, N.; Ordonez R, E. [ININ, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico); Solis C, D. A. [Universidad Autonoma del Estado de Mexico, Facultad de Quimica, Paseo Colon y Paseo Tollocan, 50120 Toluca, Estado de Mexico (Mexico); Simoni, E.; Drot, R.; Jeanson, A., E-mail: eduardo.ordonez@inin.gob.mx [Universite Paris-Sud, Institut de Physique Nucleaire, Georges Clemenceau No. 15, Orsay (France)

    2013-10-15

    Several physical and chemical tests were carried out to evaluate the influence of the oxalic acid in the uranium (Vi) sorption on the surface of the zirconium diphosphate. The physical analyses consist of atomic force microscopy (AFM) and total organic coal, and the chemists are the calculation of the reaction heat for the hydrate and sorption processes, the reaction speed constant and the sorption yield in the sodium perchlorate systems and of oxalic acid; these tests allow to corroborate that the oxalic acid influences positively in the uranium (Vi) sorption forming a ternary system of ZrP{sub 2}O{sub 7}/(C{sub 2}O{sub 4})/U(Vi), with a single configuration along the ph interval studied. (Author)

  9. The PRoViDE framework for the quantitative geologic analysis of reconstructed Martian terrain and outcrops

    Science.gov (United States)

    Traxler, Christoph; Hesina, Gerd; Barnes, Robert; Gupta, Sanjeev; Paar, Gerhard

    2016-04-01

    The EU-FP7 project PRoViDE (Planetary Robotics Vision Data Exploitation) assembled a major portion of the imaging data gathered so far from planetary surface missions into a unique 3D database, brought them into a spatial context and provides access to a complete set of 3D vision products. The processing chain (PRoViP) is able to generate novel 3D fusion products between HiRISE orbiter and multiple-station rover stereo imagery from NASA's Mars Exploration Rover - MER (Pancam, Navcam), and Mars Science Laboratory Curiosity - MSL (Mastcam). An important tool of the PRoViDE framework, using PRoViP multi-resolution 3D vision processing products, is called PRo3D. It is an interactive virtual environment for the scientific exploration and analysis of reconstructed Martian terrain and digital outcrop models. Data fusion is supported so that multiple models with different scales and geometric resolutions can be combined in one 3D scene. This allows studying both the large geological context, which usually is reconstructed from orbiter imagery, and small outcrop details originating from rover camera imagery. PRo3D allows the user to fluently move around and zoom to investigate features at different scales and perspectives, as well as providing various interactive analysis tools. Interpretations can be digitised directly onto the 3D surface, and simple measurements can be taken of the dimensions of the outcrop and sedimentary features. The 3D data allows for incorporation of the geometrical features of the sedimentary layers into the measurements to obtain the true dimensions of those features. Dip and strike is calculated within PRo3D from mapped bedding contacts and fracture traces, through which a best fit plane is created to derive the dip and strike vectors. Scientists can organize measurements and annotations according to their geological context in a hierarchical way. These tools have been tested on two case studies; Victoria Crater and Shaler. Victoria Crater, in the

  10. Effect of Phosphate on U(VI) Sorption to Montmorillonite: Ternary Complexation and Precipitation Barriers

    Energy Technology Data Exchange (ETDEWEB)

    Troyer, Lyndsay D.; Maillot, Fabien; Wang, Zheming; Wang, Zimeng; Mehta, Vrajesh; Giammar, Daniel; Catalano, Jeffrey G.

    2016-02-15

    Phosphate addition is a potential treatment method to lower the solubility of U(VI) in soil and groundwater systems by causing U(VI) phosphate precipitation as well as enhancing adsorption. Previous work has shown that iron oxide surfaces may facilitate the nucleation of U(VI) phosphate minerals and, that under weakly acidic conditions, phosphate also enhances U(VI) adsorption to such phases. Like iron oxides, clays are important reactive phases in the subsurface but little is known about the interaction of U(VI) and phosphate with these minerals. The effect of aqueous phosphate on U(VI) binding to Wyoming montmorillonite (SWy-2) in air-equilibrated systems was investigated. Equilibrium U(VI) uptake to montmorillonite was determined at pH 4, 6 and 8 at discrete initial phosphate concentrations between 0 and 100 μM. The observed behavior of U(VI) indicates a transition from adsorption to precipitation with increasing total uranium and phosphate concentrations at all pH values. At the highest phosphate concentration examined at each pH value, a barrier to U(VI) phosphate nucleation is observed. At lower concentrations, phosphate has no effect on macroscopic U(VI) adsorption. To assess the mechanisms of U(VI)-phosphate interactions on smectite surfaces, U(VI) speciation was investigated under selected conditions using laser-induced fluorescence spectroscopy (LIFS) and extended X-ray absorption fine-structure (EXAFS) spectroscopy. Samples above the precipitation threshold display EXAFS and LIFS spectral signatures consistent with the autunite family of U(VI) phosphate minerals. However, at lower U(VI) concentrations, changes in LIFS spectra upon phosphate addition suggest that U(VI)-phosphate ternary surface complexes form on the montmorillonite surface at pH 4 and 6 despite the lack of a macroscopic effect on adsorption. The speciation of solid-associated U(VI) below the precipitation threshold at pH 8 is dominated by U(VI)-carbonate surface complexes. This work

  11. Effect of phosphate on U(VI) sorption to montmorillonite: Ternary complexation and precipitation barriers

    Science.gov (United States)

    Troyer, Lyndsay D.; Maillot, Fabien; Wang, Zheming; Wang, Zimeng; Mehta, Vrajesh S.; Giammar, Daniel E.; Catalano, Jeffrey G.

    2016-02-01

    Phosphate addition is a potential treatment method to lower the solubility of U(VI) in soil and groundwater systems by causing U(VI) phosphate precipitation as well as enhancing adsorption. Previous work has shown that iron oxide surfaces may facilitate the nucleation of U(VI) phosphate minerals and, that under weakly acidic conditions, phosphate also enhances U(VI) adsorption to such phases. Like iron oxides, clays are important reactive phases in the subsurface but little is known about the interaction of U(VI) and phosphate with these minerals. The effect of aqueous phosphate on U(VI) binding to Wyoming montmorillonite (SWy-2) in air-equilibrated systems was investigated. Equilibrium U(VI) uptake to montmorillonite was determined at pH 4, 6 and 8 at discrete initial phosphate concentrations between 0 and 100 μM. The observed behavior of U(VI) indicates a transition from adsorption to precipitation with increasing total uranium and phosphate concentrations at all pH values. At the highest phosphate concentration examined at each pH value, a barrier to U(VI) phosphate nucleation is observed. At lower concentrations, phosphate has no effect on macroscopic U(VI) adsorption. To assess the mechanisms of U(VI)-phosphate interactions on smectite surfaces, U(VI) speciation was investigated under selected conditions using laser-induced fluorescence spectroscopy (LIFS) and extended X-ray absorption fine-structure (EXAFS) spectroscopy. Samples above the precipitation threshold display EXAFS and LIFS spectral signatures consistent with the autunite family of U(VI) phosphate minerals. However, at lower U(VI) concentrations, changes in LIFS spectra upon phosphate addition suggest that U(VI)-phosphate ternary surface complexes form on the montmorillonite surface at pH 4 and 6 despite the lack of a macroscopic effect on adsorption. The speciation of solid-associated U(VI) below the precipitation threshold at pH 8 is dominated by U(VI)-carbonate surface complexes. This work

  12. Interaction of aerobic soil bacteria with plutonium(VI)

    International Nuclear Information System (INIS)

    We studied the interaction of Pu(VI) with Pseudomonas stutzeri ATCC 17588 and Bacillus sphaericus ATCC 14577, representatives of the main aerobic groups of soil bacteria present in the upper soil layers. The biosorption studies have shown that these soil bacteria accumulate high amounts of Pu(VI). The relative sorption efficiency toward Pu(VI) related to the amount of biomass used decreased with increasing biomass concentration due to increased agglomeration of the bacteria resulting in a decrease of the number of available complexing groups. Spores of Bacillus sphaericus showed a higher biosorption than the vegetative cells at low biomass concentration which decreased significantly with increasing biomass concentration. At higher biomass concentrations (> 0.7 g/L), the vegetative cells of both strains and the spores of B. sphaericus showed comparable sorption efficiencies. Investigations on the pH dependency of the biosorption and extraction studies with 0.01 M EDTA solution have shown that the biosorption of plutonium is a reversible process and the plutonium is bound by surface complexation. Optical absorption spectroscopy showed that one third of the initially present Pu(VI) was reduced to Pu(V) after 24 hours. Kinetic studies and solvent extraction to separate different oxidation states of Pu after contact with the biomass provided further information on the yield and the kinetics of the bacteria-mediated reduction. Long-term studies showed that also 16% of Pu(IV) was formed after one month. The slow kinetics of this process indicate that under our experimental conditions the Pu(IV) was not a produced by microbial reduction but seemed to be rather the result of the disproportionation of the formed Pu(V) or autoreduction of Pu(VI). (orig.)

  13. HENRY'S LAW CALCULATOR

    Science.gov (United States)

    On-Site was developed to provide modelers and model reviewers with prepackaged tools ("calculators") for performing site assessment calculations. The philosophy behind OnSite is that the convenience of the prepackaged calculators helps provide consistency for simple calculations,...

  14. A study of solid-liquid phase equilibria of Pu(VI) and U(VI) in aqueous carbonate systems

    International Nuclear Information System (INIS)

    Solubility products of PuO2CO3(s) and UO2CO3(s) are determined in 0.1 M NaClO4 at 22 ± 1 C under 100%, 1% and 0.03% CO2. The carbonate precipitates of Pu(VI) and U(VI), prepared under 100% CO2 at neutral pH, are characterized by powder diffraction measurement, IR spectroscopy and UV spectroscopy. The solubility experiment is carried out in different CO32-concentrations and pH. The speciation of PuO22+ and UO22+ in equilibrium solutions is made by UV spectroscopy and the total concentrations of Pu(VI) and U(VI) are determined by liquid scintillation spectrometry and ICP-AES, respectively. The concentration correlation of [MO22+] vs. [CO32-] gives a slope of negative unity, while [MO22+] vs. pH shows a slope of -2 irrespective of CO2 partial pressure. The fact concludes that the present experiment comprises solid-liquid phase equilibrium reactions with only MO2CO3(s). The solubility products converted to zero ionic strength are found to be logKspo = -14.84 ± 0.10 for PuO2CO3(s) and logKspo = -14.22 ± 0.14 for UO2CO3(s). (orig.)

  15. Novel metal containing polymers: characterization, radiation chemistry, and evaluation of utility for electron lithography. [Polymeric dicarboxylato-dioxouranium (VI) species

    Energy Technology Data Exchange (ETDEWEB)

    Hardiman, C.J.

    1985-01-01

    Polymeric dicarboxylato-dioxouranium(VI) species have been synthesized by two different methods. An equilibrium controlled solution relation has been devised where bis(acetato)dioxouranium(VI) undergoes an acid interchange reaction with a simple dicarboxylic acid. The materials synthesized in this manner have been characterized by several methods. An end group analysis is possible by high resolution nuclear magnetic resonance detection of the acetate reactant fragment. The concentration of acetate relative to bridging ligand can be used to calculate number average molecular weights. The gel permeation chromatographic method has been calibrated with poly((3,3-dimethylpentanedioato)(dimethylsulfoxide)dioxouranium(VI)) and gives a simple relation of molecular weight versus milliliters of retention volume. Inclusion of the respective intrinsic viscosities and a comparison to the universal calibration curve, based on polystyrene, shows no significant difference. The net radiation chemistry of the polymeric materials has been evaluated with gel permeation chromatography. Solid samples were irradiated with TXCs gamma radiation and the change in molecular weight with dose determined. These studies indicate that many of the uranium containing polymers possess unusually high sensitivities to radiation.

  16. Solid phase extraction of chromium(VI) using Aliquat336 immobilized on a thin film of multiwall carbon nanotubes

    International Nuclear Information System (INIS)

    We report on a novel and selective method for the preconcentration and determination of Cr(VI) in aqueous samples. Cr(VI) is adsorbed - in a 'batch mode' - on multiwalled carbon nanotubes covered with Aliquat 336 and then determined directly, i.e., on the solid, by X-ray fluorescence spectrometry. This reduces the number of reagents and minimizes sample handling. The method combines the advantages of solid-phase extraction with the benefits of the XRF method in that the large areas required by the carbon nanotubes make them a promising solid sorbent for preconcentration. The enrichment factor was calculated after considering that the thin film obtained from the 10 mL solution of 1 mg L-1 of Cr(VI) has a real thickness of 0.04 mm and a final diameter of 16.7 mm, so that the volume deposited on the pellet is 0.0088 cm3 and the preconcentration factor is 1000. (author)

  17. Solvent extraction of nitric acid, uranium (VI) and thorium (IV) by N, N, N', N'-tetrahexylsuccinylamide

    International Nuclear Information System (INIS)

    A new kind of diamide N,N,N',N'-tetrahexylsuccinylamide (THSA) was synthesized, characterized and used for the extraction of HNO3, U(VI) and Th(IV) in a diluent composed of 0.5 volume fraction 1,2,4-trimethyl benzene (TMB) and 0.5 volume fraction kerosene (OK). Extraction distribution coefficients of U(VI) and Th(IV) as functions of aqueous nitric acid concentration, extractant concentration, temperature and salting-out agent (LiNO3) have been studied, and it is found that THSA as an extractant is superior to TBP for extraction of U(VI) and Th(IV). Back extraction was also studied. At low acidity, the main adduct of THSA and HNO3 is HNO3·THSA. THSA·(HNO3)2 and THSA·(HNO3)3 are also found at high acidity. The compositions of extracted species, apparent equilibrium constants and enthalpies of extraction reactions have also been calculated

  18. Efficacy of mangrove leaf powder for bioremediation of chromium (VI) from aqueous solutions: kinetic and thermodynamic evaluation

    Science.gov (United States)

    Sathish, Thadikamala; Vinithkumar, N. V.; Dharani, G.; Kirubagaran, R.

    2014-03-01

    Biosorption of heavy metals by bio-materials has been posited as a potential alternative to the existing physicochemical technologies for detoxification and recovery of toxic and valuable metals from wastewaters. In this context, the role of mangrove leaf powder (MLP) as biosorbent for chromium removal was investigated. In the present study, the effect of process parameters such as particle size, solution pH, initial concentration of Cr(VI) ion and adsorbent dose on chromium removal by MLP was investigated. The maximum sorption was observed at particle size 0.5 mm and pH 2.0. The adsorption data follow the pseudo second-order kinetics model. The isotherms denote that Langmuir model is the best fitted than Freundlich model. The maximum adsorption capacity (Q 0) of 60.24 mg/g of Cr(VI) at 30 min on MLP was determined using the Langmuir model. The adsorption isotherm model indicates that the chromium is adsorbing as monolayer on the surface of MLP with heterogeneous energetic distribution of active sites. Various thermodynamic parameters, such as Gibb's free energy (∆G °), enthalpy (∆H °) and entropy (∆S °) have been calculated. The thermodynamic data revealed that the adsorption of chromium ions onto MLP is endothermic in nature and a spontaneous process. The results of the present study suggest that MLP is an effective bioremediation measure for removal of high concentration of Cr(VI) in waste waters.

  19. Carbonic Anhydrase VI Gene Polymorphism rs2274327 Relationship Between Salivary Parameters and Dental-Oral Health Status in Children.

    Science.gov (United States)

    Sengul, Fatih; Kilic, Munevver; Gurbuz, Taskin; Tasdemir, Sener

    2016-08-01

    The aim of this study was to research carbonic anhydrase (CA) VI one single-nucleotide polymorphism (SNP) and its potential association with dental-oral health status (dental caries, Plaque Index (PI) and Gingival Index (GI)) and salivary parameters (salivary buffering capacity, salivary flow rate (SFR)) in children. A total of 178 children were divided into two groups: non-carious (n = 70, 34 boys and 36 girls) and carious (n = 108, 47 boys and 61 girls). The clinical evaluations were performed according to the decayed, missing, and filled teeth (dmft/DMFT) index by a specialist. Clinical parameters including PI, GI, and simplified oral hygiene index (OHI-S) were recorded. Salivary pH (SpH) was measured using pH paper. Blood samples and unstimulated whole saliva were collected, and SFR was calculated. The CA VI rs2274327 polymorphism was determined by a LightSNiP assay on the realtime PCR system. The frequencies of rs2274327 were not significant between groups (p > 0.05). There was a positive correlation between OHI-S and SpH in the carious and non-carious groups (p  0.05). CA VI SNP (rs2274327) had no statistically significant association with OHI-S, PI, GI, SFR, and SpH in the children. PMID:27100223

  20. The interplay between thiol-compounds against chromium (VI) in the freshwater green alga Monoraphidium convolutum: Toxicology, photosynthesis, and oxidative stress at a glance

    International Nuclear Information System (INIS)

    In this paper, the multifaceted Cr(VI) toxicity over the freshwater green alga Monoraphidium convolutum was assessed by concomitantly monitoring thiol-dependent redox balances, photosynthesis activity and growth-survival scores. Control group showed exponential growth rate at (5.78 ± 0.29) division/day until 8th day with linear increasing chlorophyll a/protein ratios (CHLa/PROT) throughout the period. Cultures of M. convolutum were exposed for 5 days to Cr(VI) concentrations from 0 up to 100 mg/L showing that CHLa/PROT ratios were sensibly affected, in agreement to the calculated LC50,48h (5.38 ± 0.72) mg/L from the concentration-response curve of cell mortality after 48 h. Regarding photosynthesis effects, Cr(VI) concentrations >1.0 mg/L showed significant increases in short-term (after 2 h) electron transfer rates (ETR) and quantum yields of photosystem II (ΦPSII), followed by subsequent decline of both parameters after 48 and 72 h. Biochemical analyses showed that maximal GSH concentrations in algal cultures were observed upon 1 mg Cr(VI)/L and higher dichromate concentrations dramatically increased the activity of antioxidant GSH-dependent enzymes ascorbate peroxidase and glutathione reductase. However, no variation was observed in the cellular GSH levels, whereas GSSG and lipid peroxidation indexes abruptly increased upon 10 mg Cr(VI)/L exposure. Altogether, plant physiology, photosynthesis and biochemical data suggest that the GSH-dependent antioxidant system is capable to sustain M. convolutum viability through efficient photosynthesis activity and adequate antioxidant responses up to Cr(VI) concentrations of 1.0 mg/L, when redox unbalances were first evidenced.

  1. Reaction of chromium(VI) with glutathione or with hydrogen peroxide: identification of reactive intermediates and their role in chromium(VI)-induced DNA damage.

    OpenAIRE

    Aiyar, J; Berkovits, H J; Floyd, R A; Wetterhahn, K E

    1991-01-01

    The types of reactive intermediates generated upon reduction of chromium(VI) by glutathione or hydrogen peroxide and the resulting DNA damage have been determined. In vitro, reaction of chromium(VI) with glutathione led to formation of two chromium(V) complexes and the glutathione thiyl radical. When chromium(VI) was reacted with DNA in the presence of glutathione, chromium-DNA adducts were obtained, with no DNA strand breakage. The level of chromium-DNA adduct formation correlated with chrom...

  2. Science and society test VI: Energy economics

    Science.gov (United States)

    Hafemeister, David W.

    1982-01-01

    Simple numerical estimates are developed in order to quantify a variety of energy economics issues. The Verhulst equation, which considers the effect of finite resources on petroleum production, is modified to take into account supply and demand economics. Numerical and analytical solutions to these differential equations are presented in terms of supply and demand elasticity functions, various finite resources, and the rate of increase in fuel costs. The indirect cost per barrel of imported oil from OPEC is shown to be about the same as the direct cost. These effects, as well as those of discounted benefits and deregulation, are used in a calculation of payback periods for various energy conserving devices. A phenomenological model for market penetration is developed along with the factors for future energy growth rates. A brief analysis of the economic returns of the ''house doctor'' program to reprofit houses for energy conservation is presented.

  3. 13 CFR Appendix A to Part 112 - Appendix A to Part 112

    Science.gov (United States)

    2010-01-01

    ...—economic injury Small Business Act, sec. 7(b)(4). Other Federal Financial Assistance Women's business... FEDERALLY ASSISTED PROGRAMS OF SBA-EFFECTUATION OF TITLE VI OF THE CIVIL RIGHTS ACT OF 1964 Pt. 112, App....

  4. 76 FR 30250 - Share Insurance and Appendix

    Science.gov (United States)

    2011-05-25

    ... regarding noninterest-bearing transaction accounts. 75 FR 80367 (December 22, 2010). The following... ADMINISTRATION 12 CFR Part 745 RIN 3133-AD79 Share Insurance and Appendix AGENCY: National Credit Union... transaction account. Although this insurance coverage is self- implementing, and therefore already in...

  5. Energy 21. Preconditions and results. Appendix

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1998-03-01

    This appendix comprises the following 5 scenarios: Reference scenario for electricity and district heating supply; Action plan scenario for electricity and district heat supply; Energy balances for reference and action plan scenarios; Investments and operating costs for user installations; Projection of CO{sub 2} emissions from the transport sector. (EG)

  6. The environmental survey manual: Appendix D

    International Nuclear Information System (INIS)

    The purpose of this manual is to provide guidance to the Survey and Sampling and Analysis teams that conduct the one-time Environmental Survey of the major US Department of Energy operating facilities. This appendix contains procedures for chemical analysis of organics, inorganics, and radioisotopes

  7. Mucocele of the appendix. Radiological findings

    International Nuclear Information System (INIS)

    Radiological findings of CT and MRI were evaluated in 11 cases of mucocele of the appendix. Mucocele is a rare disease entity and preoperative diagnosis is very important. The radiological findings were a well defined cystic mass with a wall of variable thickness. Nodular lesion in the wall of the mucocele may be a suggestive finding of malignant case of mucocele. (author)

  8. Appendix B: Methodology. [2014 Teacher Prep Review

    Science.gov (United States)

    Greenberg, Julie; Walsh, Kate; McKee, Arthur

    2014-01-01

    The "NCTQ Teacher Prep Review" evaluates the quality of programs that provide preservice preparation of public school teachers. This appendix describes the scope, methodology, timeline, staff, and standards involved in the production of "Teacher Prep Review 2014." Data collection, validation, and analysis for the report are…

  9. Appendix to Power Dissipation in Division

    DEFF Research Database (Denmark)

    Liu, Wei; Nannarelli, Alberto

    This document is an appendix to the paper: Wei Liu and Alberto Nannarelli, ”Power Dissipation in Division”, Proc. of 42nd Asilomar Conference on Signals, Systems, and Computers, October 2008. The purpose of the document is to provide the necessary information for the implementation of the...

  10. Primary lymphoma of appendix: Ultrasound finding

    International Nuclear Information System (INIS)

    We present an uncommon case of primary lymphoma of the appendix in a patient who complained of discomfort in lower right quadrant. The findings revealed by ultrasound, barium enema and CT scan are reported and the diagnostic aspects of this appendiceal tumor and others are discussed. (Author) 6 refs

  11. Energy levels and radiative rates for transitions in Fe V, Co VI and Ni VII

    CERN Document Server

    Aggarwal, K M; Keenan, F P; Kisielius, R

    2016-01-01

    Energy levels, Land\\'{e} $g$-factors and radiative lifetimes are reported for the lowest 182 levels of the 3d$^4$, 3d$^3$4s and 3d$^3$4p configurations of Fe~V, Co~VI and Ni~VII. Additionally, radiative rates ($A$-values) have been calculated for the E1, E2 and M1 transitions among these levels. The calculations have been performed in a quasi-relativistic approach (QR) with a very large {\\em configuration interaction} (CI) wavefunction expansion, which has been found to be necessary for these ions. Our calculated energies for all ions are in excellent agreement with the available measurements, for most levels. Discrepancies among various calculations for the radiative rates of E1 transitions in Fe~V are up to a factor of two for stronger transitions ($f \\geq 0.1$), and larger (over an order of magnitude) for weaker ones. The reasons for these discrepancies have been discussed and mainly are due to the differing amount of CI and methodologies adopted. However, there are no appreciable discrepancies in similar ...

  12. Influence of Mass Transfer on Bioavailability and Kinetic Rate of Uranium(VI) Biotransformation

    International Nuclear Information System (INIS)

    In contaminated subsurface sediments, U(VI) resides in both interparticle (where active water flow occurs) and intraparticle domains (where static water resides). Dissimilatory metal reducing bacteria (DMRB) can reduce aqueous (interparticle) U(VI) to U(IV) under anoxic conditions yielding an insoluble precipitate [U(IV)O2]. Intraparticle U(VI) can only be reduced by DMRB if it dissolves and diffuses to the interparticle domain populated by microbiota, or if the DMRB release, or dispose of electron to soluble compounds that can diffuse to, and react with intraparticle U(VI) precipitates. At DOE Hanford site, recent characterization of U(VI) speciation and physical location in 30-year contaminated sediments demonstrated that U(VI) resides as a U(VI)-silicate microprecipitates in small fractures and cleavages within sediment particle grains exhibiting pore sizes of a few microns or less. The U(VI) microprecipitates dissolved slowly into undersaturated pore water, but the dissolution kinetics and diffusive rate of U(VI) transport from intraparticle regions was slow when compared to the reduction rate of aqueous U(VI) by DMRB. These results indicated that: (1) a majority of the sorbed U(VI) pool was not physically accessible to DMRB due to size restrictions of the grain porosity, and (2) the bioavailability and overall rates of microbial U(VI) reduction in the sediments could be limited by the mass transfer rates of U(VI) from intraparticle regions. This research is focused on the bioavailability and kinetic rates of microbial reduction of U(VI) associated with intraparticle regions. The understanding of the influence of mass transfer on microbial reduction of U(VI) is needed not only at the Hanford site, but also at Oak Ridge FRC, where a critical issue is the long term diffusion of U(VI) from fine-grained saprolite matrix that is physically inaccessible to DMRB. The objectives are: (1) Develop approaches to characterize microscopic properties of mass transfer

  13. Voltammetric behaviour of uranium(VI) in sulfuric acid solutions containing pyridine

    International Nuclear Information System (INIS)

    It was shown that 8.8 x 10-5 to 4.4 x 10-3 M uranium(VI) solutions in sulfuric acid containing pyridine give a clearly defined cathodic peak with a height proportional to uranium(VI) concentration. Under the specified conditions, the electroreduction of uranium(VI) is irreversible and involves one electron, the limiting current of uranium(VI) is diffusion- and kinetically controlled. The kinetic parameters of the process under study were determined, and the effect of associated elements on the voltammetric behavior of uranium(VI) in pyridine-containing sulfuric acid supporting electrolytes was estimated

  14. Research of thermodynamic and kinetics in preparing U(IV) by reducing and catalyzing U(VI) with hydrazine

    Energy Technology Data Exchange (ETDEWEB)

    Xia, Liangshu; Xiao, Yiqun [South China Univ., Hengyang (China). School of Nuclear Science and Technology; Hu, Si-Si; Peng, Anguo; Xiao, Jingshui [South China Univ., Hengyang (China). School of Chemistry and Chemical Engineering; He, Hui; Li, Bin [China Institute of Atomic Energy, Beijing (China)

    2015-09-01

    The effect of concentration of U(VI), hydrazine, nitric acid and the amount of catalyst, and the thermodynamics and kinetics of the reaction in preparing U(IV) by catalyzing and reducing U(VI) are studied in catalytic reduction of U(VI) with hydrazine as reductant and Pt as catalyst. The comparison of calculated theoretical reaction heat value and practical value is also given. The result shows that with the increase of density of U(VI) and hydrazine, increase of amount of catalyst and decrease of nitric acid, reaction rate slows down. The reaction kinetic rate equation is as follow: -dC(UO{sub 2}{sup 2+})/dt = kC{sup 1.11}(UO{sub 2}{sup 2+})C{sup 1.42}(N{sub 2}H{sub 5}{sup +})C{sup -0.72}(H{sup +}), and the reaction rate constant is 1.3 x 10{sup -3} (mol/L){sup -0.81}/min when r{sub S/L} is 0.008 kg/L at 50 C. The theoretical reaction equation of unit volume is as follows: Q = aΔ{sub f}H{sub m,1} {sup direct} {sup difference} + Δ{sub f}H{sub m,2} {sup direct} {sup difference} [C(N{sub 2}H{sub 4}) - C(UO{sub 2}{sup 2+})a/2 - β]/3. The comparison shows the coincidence in 1 h of theoretical value and practical value.

  15. Hexavalent chromium [Cr(VI)] removal by acid modified waste activated carbons.

    Science.gov (United States)

    Ghosh, Pranab Kumar

    2009-11-15

    Fresh activated carbon (AC) and waste activated carbon (WAC) were pretreated by heating with mineral acids (sulfuric acid and nitric acid) at high temperature to prepare several grades of adsorbents to evaluate their performance on Cr(VI) removal from aqueous phase. Effects of temperature, agitation speed and pH were tested, and optimum conditions were evaluated. Kinetic study was performed under optimum conditions with several grades of modified adsorbents to know the rates of adsorption. Batch adsorption equilibrium data followed both, Freuindlich and Langmuir isotherms. Maximum adsorption capacity (q(max)) of the selected adsorbents treated with sulfuric acid (MWAC 1) and nitric acid (MWAC 2), calculated from Langmuir isotherm are 7.485 and 10.929 mg/g, respectively. Nitric acid treated adsorbent (MWAC 2) was used for column study to determine the constants of bed depth service time (BDST) model for adsorption column design. PMID:19553008

  16. Pressure-dependent dynamical properties of Zn-based II-VI semiconductors

    International Nuclear Information System (INIS)

    The effect of pressure on optical phonons and polaron properties in ZnS, ZnSe, and ZnTe II-VI compound semiconductors has been investigated. The calculations are performed in the framework of ab initio pseudopotential approach based on the density functional perturbation theory. At zero pressure, a reasonable degree of agreement is generally found between our results and data available in the literature. It is found that when pressure is increased the phonon modes at Γ in the Brillouin zone are shifted towards high energies. The pressure dependence of features such as Fröhlich coupling parameter, the Debye temperature of the longitudinal optical phonon frequency and the polaron effective mass showed that the polaron properties are sensitive to the pressure effect.

  17. Form factor expansions in the 2D Ising model and Painleve VI

    International Nuclear Information System (INIS)

    We derive a Toda-type recurrence relation, in both high- and low-temperature regimes, for the λ-extended diagonal correlation functions C(N,N;λ) of the two-dimensional Ising model, using an earlier connection between diagonal form factor expansions and tau-functions within Painleve VI (PVI) theory, originally discovered by Jimbo and Miwa. This greatly simplifies the calculation of the diagonal correlation functions, particularly their λ-extended counterparts. We also conjecture a closed form expression for the simplest off-diagonal case C±(0,1;λ) where a connection to PVI theory is not known. Combined with the results for diagonal correlations these give all the initial conditions required for the λ-extended version of quadratic difference equations for the correlation functions discovered by McCoy, Perk and Wu. The results obtained here should provide a further potential algorithmic improvement in the λ-extended case, and facilitate other developments.

  18. Form factor expansions in the 2D Ising model and Painleve VI

    Energy Technology Data Exchange (ETDEWEB)

    Mangazeev, Vladimir V., E-mail: Vladimir.Mangazeev@anu.edu.a [Department of Theoretical Physics, Research School of Physics and Engineering, Australian National University, Canberra, ACT 0200 (Australia); Guttmann, Anthony J., E-mail: tonyg@ms.unimelb.edu.a [ARC Centre of Excellence for Mathematics and Statistics of Complex Systems, Department of Mathematics and Statistics, The University of Melbourne, Victoria 3010 (Australia)

    2010-10-21

    We derive a Toda-type recurrence relation, in both high- and low-temperature regimes, for the {lambda}-extended diagonal correlation functions C(N,N;{lambda}) of the two-dimensional Ising model, using an earlier connection between diagonal form factor expansions and tau-functions within Painleve VI (PVI) theory, originally discovered by Jimbo and Miwa. This greatly simplifies the calculation of the diagonal correlation functions, particularly their {lambda}-extended counterparts. We also conjecture a closed form expression for the simplest off-diagonal case C{sup {+-}}(0,1;{lambda}) where a connection to PVI theory is not known. Combined with the results for diagonal correlations these give all the initial conditions required for the {lambda}-extended version of quadratic difference equations for the correlation functions discovered by McCoy, Perk and Wu. The results obtained here should provide a further potential algorithmic improvement in the {lambda}-extended case, and facilitate other developments.

  19. Form factor expansions in the 2D Ising model and Painlevé VI

    Science.gov (United States)

    Mangazeev, Vladimir V.; Guttmann, Anthony J.

    2010-10-01

    We derive a Toda-type recurrence relation, in both high- and low-temperature regimes, for the λ-extended diagonal correlation functions C(N,N;λ) of the two-dimensional Ising model, using an earlier connection between diagonal form factor expansions and tau-functions within Painlevé VI (PVI) theory, originally discovered by Jimbo and Miwa. This greatly simplifies the calculation of the diagonal correlation functions, particularly their λ-extended counterparts. We also conjecture a closed form expression for the simplest off-diagonal case C(0,1;λ) where a connection to PVI theory is not known. Combined with the results for diagonal correlations these give all the initial conditions required for the λ-extended version of quadratic difference equations for the correlation functions discovered by McCoy, Perk and Wu. The results obtained here should provide a further potential algorithmic improvement in the λ-extended case, and facilitate other developments.

  20. Extractive and spectrophotometric determination of U(VI) using novel chromogenic reagent

    International Nuclear Information System (INIS)

    A simple spectrophotometric method for the determination of U (VI) using 1,8-dihydroxy-2-(phenol-3 phenolyl azo)- napthalene-3,6-disulphonic acid or phenolyl- azo -chromotropic acid (PACA) is developed. The reagent was synthesized and used for extraction of uranium. At pH 7.8-10.5 uranium forms a Orange colored complex with PACA which was then quantitatively extracted in chloroform showing maximum absorbance at wavelength of 480 nm. The proposed method obeys Beer's law in the range of 1.0-16.0 ppm. Molar absorptivity and Sandelson's sensitivity of extracted species were calculated to be 1.250x104 lmol-1 cm-1 and 7.9 x10-5 mg cm-2 respectively. The method was applied for the determination of uranium in synthetic and plant samples. It was found that the newly developed method is competent to those of standard methods. (author)

  1. Energy levels and radiative rates for Cr-like Cu VI and Zn VII

    CERN Document Server

    Aggarwal, K M; Keenan, F P; Kisielius, R

    2016-01-01

    Energy levels and radiative rates (A-values) for transitions in Cr-like Cu~VI and Zn~VII are reported. These data are determined in the quasi-relativistic approach (QR), by employing a very large {\\em configuration interaction} (CI) expansion which is highly important for these ions. No radiative rates are available in the literature to compare with our results, but our calculated energies are in close agreement with those compiled by NIST and other available theoretical data, for a majority of the levels. The A-values (and resultant lifetimes) are listed for all significantly contributing E1, E2 and M1 radiative transitions among the energetically lowest 322 levels of each ion.

  2. Intensity enhancement of O VI ultraviolet emission lines in solar spectra due to opacity

    CERN Document Server

    Keenan, F P; Madjarska, M S; Rose, S J; Bowler, L A; Britton, J; McCrink, L; Mathioudakis, M

    2014-01-01

    Opacity is a property of many plasmas, and it is normally expected that if an emission line in a plasma becomes optically thick, its intensity ratio to that of another transition that remains optically thin should decrease. However, radiative transfer calculations undertaken both by ourselves and others predict that under certain conditions the intensity ratio of an optically thick to thin line can show an increase over the optically thin value, indicating an enhancement in the former. These conditions include the geometry of the emitting plasma and its orientation to the observer. A similar effect can take place between lines of differing optical depth. Previous observational studies have focused on stellar point sources, and here we investigate the spatially-resolved solar atmosphere using measurements of the I(1032 A)/I(1038 A) intensity ratio of O VI in several regions obtained with the Solar Ultraviolet Measurements of Emitted Radiation (SUMER) instrument on board the Solar and Heliospheric Observatory (...

  3. Bianchi VI{sub 0} and III models: self-similar approach

    Energy Technology Data Exchange (ETDEWEB)

    Belinchon, Jose Antonio, E-mail: abelcal@ciccp.e [Departamento de Fisica, ETS Arquitectura, UPM, Av. Juan de Herrera 4, Madrid 28040 (Spain)

    2009-09-07

    We study several cosmological models with Bianchi VI{sub 0} and III symmetries under the self-similar approach. We find new solutions for the 'classical' perfect fluid model as well as for the vacuum model although they are really restrictive for the equation of state. We also study a perfect fluid model with time-varying constants, G and LAMBDA. As in other studied models we find that the behaviour of G and LAMBDA are related. If G behaves as a growing time function then LAMBDA is a positive decreasing time function but if G is decreasing then LAMBDA{sub 0} is negative. We end by studying a massive cosmic string model, putting special emphasis in calculating the numerical values of the equations of state. We show that there is no SS solution for a string model with time-varying constants.

  4. Determination of U(VI) using novel reagent by extractive spectrophotometry

    International Nuclear Information System (INIS)

    A simple and spectrophotometric method for the determination of U(VI) using a 5-(4-pyridyl azo)-8-quinolinol (PAQ) is developed the reagent was synthesized and used for extraction of uranium. At pH 7.0 ±0.2 uranium forms a yellowish orange colored complex with PAQ, which was then quantitatively extracted from chloroform showing maximum absorbance at wavelength of 485 nm. The proposed method obeys Beer's law in the range of 0.2-10.0 μg ml-1. Molar absorptivity and Sandelson's sensitivity of extracted species was calculated to be 1.325x104 lmol-1 cm-1 and 0.421 x10-4 μg cm-2 respectively. The method was applied for the determination of uranium in food and plant samples. It was found that the newly developed method is competent to those of standard methods. (author)

  5. [Evaluating the performance of the UCLA method for spatially downscaling soil moisture products using three Ts/VI indices].

    Science.gov (United States)

    Ling, Zi-Wei; He, Long-Bin; Zeng, Hui

    2014-02-01

    Soil moisture products derived from microwave remote sensing data are commonly used in the studies of large-scale water resources or climate change. However, the spatial resolutions of these products are usually too coarse to be used in regional- or watershed-scale studies. Therefore, it is necessary to spatially downscale the coarse-resolution soil moisture products for use in regional- or watershed-scale studies. The UCLA method is one of the methods for spatially downscaling soil moisture products. In this method, the spatial indices (Ts/VI indices) calculated from land surface temperature and vegetation index are used as auxiliary variables for spatial downscaling. In this paper, we compared the performance of the UCLA method for spatially downscaling the coarse-resolution AMSR-E soil moisture products, using three Ts/VI indices as auxiliary variables, i. e., the soil wetness index (SW), temperature vegetation dryness index (TVDI), and vegetation temperature condition index (VTCI). These auxiliary variables were calculated from the products of MODIS land surface temperature (MYD11A1) and MODIS vegetation index (MYD13A2). The downscaled results using the three Ts/VI indices were all reasonable. However, the downscaled results using TVDI and VTCI were better than using SW. Therefore, we concluded that TVDI and VTCI are more suitable than SW to be used as the auxiliary variable when applying the UCLA method for downscaling soil moisture products. Finally, we discussed the error sources of applying the UCLA method, such as measurement errors of coarse resolution soil products, calculation errors from spatial indices, and errors from the UCLA method itself, and we also discussed the potential improvements of future research. PMID:24830256

  6. An evaluation of the Nb-93(n,n')Nb-93m dosimeter reaction for ENDF/B-VI

    International Nuclear Information System (INIS)

    The Nb-93(n,n')Nb-93m reaction plays an important role in nuclear energy applications. Because of its low threshold energy and relatively long half-life, it is a desirable reaction for long-term neutron fluence dosimetry in nuclear fission reactors. An evaluation of the differential cross section for this reaction was completed in 1985 by this laboratory as part of a comprehensive effort involving all neutron cross sections for niobium. The objective was to provide input for ENDF/B-VI. It was difficult to produce a reliable evaluation for this reaction in 1985 because the information available then was sparse and quite uncertain. In fact, that evaluation was based entirely on nuclear model calculations. The evaluated cross sections below 0.7 MeV were derived from calculations carried out in this laboratory, while the higher energy values were obtained from the work of Strohmaier and co-workers. In 1985 there was only one published experimental differential cross section value to consider for this reaction. Even the half-life of Nb-93m was in serious doubt. During the five years between the completion of the earlier evaluation and the finalization of ENDF/B-VI there have been some significant improvements and additions to the experimental database for this reaction. Also, new model calculations have been performed. Therefore, it was considered worthwhile to produce a new evaluation of Nb-93(n,n')Nb-93m for ENDF/B-VI which would supplant the one that had been completed in 1985

  7. Cr(VI) removal from aqueous solution by dried activated sludge biomass

    International Nuclear Information System (INIS)

    Batch experiments were conducted to remove Cr(VI) from aqueous solution using activated sludge biomass. The effects of acid pretreatment of the biomass, initial pH, biomass and Cr(VI) concentrations on Cr(VI) removal efficiency were investigated. Proton consumption during the removal process and the reducing capacity of sludge biomass were studied. The results show that acid pretreatment could significantly improve Cr(VI) removal efficiency and increase Cr(VI) reducing capacity by 20.4%. Cr(VI) removal was remarkably pH-dependent; lower pH (pH = 1, 2) facilitated Cr(VI) reduction while higher pH (pH = 3, 4) favored sorption of the converted Cr(III). Lower Cr(VI) concentration as well as higher biomass concentration could accelerate Cr(VI) removal. Cr(VI) reduction was not the only reason for proton consumption in the removal process. Pseudo-second-order adsorption kinetic model could successfully simulate Cr(VI) removal except under higher pH conditions (pH = 3, 4).

  8. Electrochemical preparation of solid ferrates(VI

    Directory of Open Access Journals (Sweden)

    Nikolić-Bujanović Ljiljana N.

    2012-01-01

    Full Text Available The electrochemical methodologies for synthesis of BaFeO4 and Ag2FeO4 are presented in this article. The first step was to prepare a solution of the K2FeO4 as starting reagent by anodic dissolution in the transpassive potential region of the electrical steel in 10M KOH. The current density applied was fixed at 20 mA/cm2 at 55°C. Solid BaFeO4 and Ag2FeO4 were precipitated from K2FeO4 solution by the addition of Ba(OH2 8H2O and AgNO3 solutions, respectively. The yield of solid salt synthesized was calculated by the hromitne titration, while their phase composition was determined by XRD analysis. Significant decomposition for BaFeO4 stored in dry conditions was not observed. Solid phase synthesized Ag2FeO4 is less stable than BaFeO4 due to its high sensitivity to light and susceptibility in such conditions to degradation to Ag2O, and AgO.

  9. Sorption behavior of U(VI), 234U(VI) and 238U(VI) onto fracture-filling clays in Beishan granite, Gansu: Application to selecting the site of high-level radwaste repository in China

    Institute of Scientific and Technical Information of China (English)

    MIN; Maozhong; LUO; Xingzhang; WANG; Ju; JIN; Yuanxin; WAN

    2005-01-01

    The first results of sorption experiments of U(VI), 234U(VI) and 238U(VI) onto original (unpurified) fracture-filling clays from No.1 monzonitic granite intrusion, Beishan area, Gansu Province, China are reported. The monzonitic granite intrusion is a potential location for a high-level radwaste (HLW) repository in China. The present experimental results show that the maximum U(VI) sorption reached 92% at near-neutral Ph and the distribution coefficient (Kd) was 1226 Ml/g. A high sorption capacity of the fracture-filling clays in host rock on radioactive elements is necessary for HLW deep geological disposal repository. No preferential sorption of 234U onto the clays was found. Finally, the sorption of U(VI) onto the clays was also modeled using a surface complexation model.

  10. Comparisons of the MCNP criticality benchmark suite with ENDF/B-VI.8, JENDL-3.3, and JEFF-3.0

    International Nuclear Information System (INIS)

    A comparative study has been performed with the latest evaluated nuclear data libraries ENDF/B-VI.8, JENDL-3.3, and JEFF-3.0. The study has been conducted through the benchmark calculations for 91 criticality problems with the libraries processed for MCNP4C. The calculation results have been compared with those of the ENDF60 library. The self-shielding effects of the unresolved-resonance (UR) probability tables have also been estimated for each library. The χ2 differences between the MCNP results and experimental data were calculated for the libraries. (author)

  11. Chromium (VI) ion adsorption features of chitosan film and its chitosan/zeolite conjugate 13X film

    OpenAIRE

    Maria Teresa Tavares; Galba M. de Campos-Takaki; Villanueva, Emílio R.; Rosa Valéria S. Amorim; Anabelle C. L. Batista

    2011-01-01

    This research evaluated the importance of the adsorption properties of chitosan a chitosan/zeolite conjugate film for the removal of Cr(VI) ions from solutions in the 5–260 mg/L concentration range, when the pH was adjusted to 4.0 and 6.0. The uptake capacities of the films formed by chitosan and by the chitosan/zeolite conjugate were calculated by mass balance. The equilibrium isotherms were fitted to the Langmuir, Freundlich and Redlich-Peterson models. The chitosan film seems to be a good ...

  12. VI-14, a novel flavonoid derivative, inhibits migration and invasion of human breast cancer cells

    International Nuclear Information System (INIS)

    It has been well characterized that flavonoids possess pronounced anticancer potentials including anti-angiogenesis, anti-metastasis, and pro-apoptosis. Herein, we report, for the first time, that VI-14, a novel flavonoid derivative, possesses anti-cancer properties. The purpose of this study is to investigate the anti-migration and anti-invasion activities of VI-14 in breast cancer cells. Our data indicate that VI-14 inhibits adhesion, migration and invasion of MDA-MB-231 and MDA-MB-435 human breast cancer cells. MDA-MB-231 cells treated with VI-14 display reduced activities and expressions of ECM degradation-associated proteins including matrix metalloproteinase 2 (MMP-2) and 9 (MMP-9) at both the protein and mRNA levels. Meanwhile, VI-14 treatment induces an up-regulated expression of tissue inhibitor of metalloproteinase 1 (TIMP-1) and 2 (TIMP-2) in MDA-MB-231 cells. Western blotting results show that phosphorylation levels of critical components of the MAPK signaling pathway, including ERK, JNK and P38, are dramatically decreased in VI-14-treated MDA-MB-231 cells. Furthermore, treatment of VI-14 significantly decreases the nuclear levels and the binding ability of nuclear factor-kappa B (NF-κB) and activator protein-1 (AP-1). Taken together, our data suggest that VI-14 treatment suppresses migration and motility of breast cancer cells, and VI-14 may be a potential compound for cancer therapy. Highlights: ► We report for the first time that VI-14 possesses anti-cancer properties. ► VI-14 weakens the adhesion, migration and invasion of human breast cancer cells. ► VI-14 decreases the activities and expressions of MMP-2/9. ► VI-14 suppresses the phosphorylation levels of the MAPK signaling pathway. ► VI-14 decreases the nuclear levels and the binding ability of NF-κB and AP-1.

  13. Kinetic desorption and sorption of U(VI) during reactive transport in a contaminated Hanford sediment.

    Science.gov (United States)

    Qafoku, Nikolla P; Zachara, John M; Liu, Chongxuan; Gassman, Paul L; Qafoku, Odeta S; Smith, Steven C

    2005-05-01

    Column experiments were conducted to investigate U(VI) desorption and sorption kinetics in a sand-textured, U(VI)-contaminated (22.7 micromol kg(-1)) capillary fringe sediment from the U.S. Department of Energy (DOE) Hanford site. Saturated column experiments were performed under mildly alkaline conditions representative of the Hanford site where uranyl-carbonate and calcium-uranyl-carbonate complexes dominate aqueous speciation. A U(VI)-free solution was used to study contaminant U(VI) desorption in columns where different flow rates were applied. Sorbed, contaminant U(VI) was partially labile (11.8%), and extended leaching times and water volumes were required for complete desorption of the labile fraction. Uranium-(VI) sorption was studied after the desorption of labile, contaminant U(VI) using different U(VI) concentrations in the leaching solution. Strong kinetic effects were observed for both U(VI) sorption and desorption, with half-life ranging from 8.5 to 48.5 h for sorption and from 39.3 to 150 h for desorption. Although U(VI) is semi-mobile in mildly alkaline, subsurface environments, we observed substantial U(VI) adsorption, significant retardation during transport, and atypical breakthrough curves with extended tailing. A distributed rate model was applied to describe the effluent data and to allow comparisons between the desorption rate of contaminant U(VI) with the rate of shortterm U(VI) sorption. Desorption was the slower process. We speculate that the kinetic behavior results from transport or chemical phenomena within the phyllosilicate-dominated fine fraction present in the sediment. Our results suggest that U(VI) release and transport in the vadose zone and aquifer system from which the sediment was obtained are kinetically controlled. PMID:15926566

  14. VI-14, a novel flavonoid derivative, inhibits migration and invasion of human breast cancer cells

    Energy Technology Data Exchange (ETDEWEB)

    Li, Fanni; Li, Chenglin; Zhang, Haiwei; Lu, Zhijian [State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Carcinogenesis and Intervention, China Pharmaceutical University, 24 Tongjiaxiang, Nanjing 210009 (China); Li, Zhiyu; You, Qidong [Department of Medicinal Chemistry, China Pharmaceutical University, Nanjing 210009 (China); Lu, Na [State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Carcinogenesis and Intervention, China Pharmaceutical University, 24 Tongjiaxiang, Nanjing 210009 (China); Guo, Qinglong, E-mail: anticancer_drug@yahoo.com.cn [State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Carcinogenesis and Intervention, China Pharmaceutical University, 24 Tongjiaxiang, Nanjing 210009 (China)

    2012-06-01

    It has been well characterized that flavonoids possess pronounced anticancer potentials including anti-angiogenesis, anti-metastasis, and pro-apoptosis. Herein, we report, for the first time, that VI-14, a novel flavonoid derivative, possesses anti-cancer properties. The purpose of this study is to investigate the anti-migration and anti-invasion activities of VI-14 in breast cancer cells. Our data indicate that VI-14 inhibits adhesion, migration and invasion of MDA-MB-231 and MDA-MB-435 human breast cancer cells. MDA-MB-231 cells treated with VI-14 display reduced activities and expressions of ECM degradation-associated proteins including matrix metalloproteinase 2 (MMP-2) and 9 (MMP-9) at both the protein and mRNA levels. Meanwhile, VI-14 treatment induces an up-regulated expression of tissue inhibitor of metalloproteinase 1 (TIMP-1) and 2 (TIMP-2) in MDA-MB-231 cells. Western blotting results show that phosphorylation levels of critical components of the MAPK signaling pathway, including ERK, JNK and P38, are dramatically decreased in VI-14-treated MDA-MB-231 cells. Furthermore, treatment of VI-14 significantly decreases the nuclear levels and the binding ability of nuclear factor-kappa B (NF-κB) and activator protein-1 (AP-1). Taken together, our data suggest that VI-14 treatment suppresses migration and motility of breast cancer cells, and VI-14 may be a potential compound for cancer therapy. Highlights: ► We report for the first time that VI-14 possesses anti-cancer properties. ► VI-14 weakens the adhesion, migration and invasion of human breast cancer cells. ► VI-14 decreases the activities and expressions of MMP-2/9. ► VI-14 suppresses the phosphorylation levels of the MAPK signaling pathway. ► VI-14 decreases the nuclear levels and the binding ability of NF-κB and AP-1.

  15. O vi Emission Imaging of a Galaxy with the Hubble Space Telescope: a Warm Gas Halo Surrounding the Intense Starburst SDSS J115630.63+500822.1

    Science.gov (United States)

    Hayes, Matthew; Melinder, Jens; Östlin, Göran; Scarlata, Claudia; Lehnert, Matthew D.; Mannerström-Jansson, Gustav

    2016-09-01

    We report results from a new Hubble Space Telescope campaign that targets the O vi λ λ 1032,1038 Å doublet in emission around intensely star-forming galaxies. The program aims to characterize the energy balance in starburst galaxies and gas cooling in the difficult-to-map coronal temperature regime of 2{--}5× {10}5 K. We present the first resolved image of gas emission in the O vi line. Our target, SDSS J115630.63+500822.1, is very compact in the continuum but displays O vi emission to radii of 23 kpc. The surface brightness profile is well fit by an exponential with a scale length of 7.5 kpc. This is 10 times the size of the photoionized gas, and we estimate that about 1/6 the total O vi luminosity comes from resonantly scattered continuum radiation. Spectroscopy—which closely resembles a stacked sample of archival spectra—confirms the O vi emission, and determines the column density and outflow velocity from blueshifted absorption. The combination of measurements enables a large number of calculations with few assumptions. The O vi regions fill only ∼ {10}-3 of the volume. By comparing the cooling time with the cloud sound-crossing time, the cooling distance with the size, and the pressure in the O vi and nebular gas, we conclude that the O vi-bearing gas cannot have been lifted to the scale height at this temperature, and must be cooling in situ through this coronal temperature regime. The coronal phase contains ∼1% of the ionized mass, and its kinetic energy at a given instant is ∼1% of the budget set by supernova feedback. However, a much larger amount of the gas must have cooled through this phase during the star formation episode. The outflow exceeds the escape velocity and the gas may become unbound, but it will recombine before it escapes and become visible to Lyman (and O i) spectroscopy. The mapping of this gas represents a crucial step in further constraining galaxy formation scenarios and guiding the development of future astronomical

  16. Applications of ENDF/B-VI and JENDL-3.1 iron data to reactor pressure vessel fluence analysis using continuous energy Monte Carlo code MCNP

    International Nuclear Information System (INIS)

    A comparison is made of results obtained from neutron transmissions analysis of RPV performed by MCNP with ENDF/B-VI and JENDL-3.1 iron data. At first, a one-dimensional discrete ordinates transport calculation using VITAMIN-C fine-group library based on ENDF/B-IV was performed for a cylindrical model of a PWR to generate the source spectrum at the front of the RPV. And then, the transmission of neutrons through RPV was calculated by MCNP with the moderated fission spectrum incident on the vessel face. For these ENDF/B-IV, -VI and JENDL-3.1 iron data were processed into continuous energy point data form by NJOY91.91. The fast neutron fluxes and dosimeter reaction rates through RPV using each iron data were intercompared

  17. FTIR Spectroscopic Characterization Of II-VI Semiconductors

    Science.gov (United States)

    Perry, G. L. E.; Szofran, F. R.

    1991-01-01

    Combination of commercial Fourier-transform infrared (FTIR) spectrometer with computer and special-purpose software constitutes highly automated facility for acquisition and processing of infrared transmission or reflection spectral image data. Intended principally to acquire transmission spectra of some compounds of elements in groups II and VI of periodic table. System used to characterize specimens of II/VI alloy semiconductors grown by directional solidification and quenching. Transmission-edge maps helpful in studies of flows, gradients of temperature, and coefficients of diffusion in solidifying melts. Data acquired by system include optical characteristics, and they both verify and complement data obtained by such other techniques as measurements of density and x-ray-dispersion analysis.

  18. O VI and H_2 Lines in Sunspots

    CERN Document Server

    Labrosse, N; Habbal, S R; Brown, D; Labrosse, Nicolas; Morgan, Huw; Habbal, Shadia Rifai; Brown, Daniel

    2006-01-01

    Sunspots are locations on the Sun where unique atmospheric conditions prevail. In particular, the very low temperatures found above sunspots allow the emission of H_2 lines. In this study we are interested in the radiation emitted by sunspots in the O VI lines at 1031.96 A and 1037.60 A. We use SOHO/SUMER observations of a sunspot performed in March 1999 and investigate the interaction between the O VI lines and a H_2 line at 1031.87 A found in the Werner band. The unique features of sunspots atmospheres may very well have important implications regarding the illumination of coronal O+5 ions in the low corona, affecting our interpretation of Doppler dimming diagnostics.

  19. Upper Limits on O VI Emission from Voyager Observations

    Indian Academy of Sciences (India)

    Jayant Murthy

    2002-03-01

    We have examined 426 Voyager fields distributed across the sky for O VI ( 1032/1038 Å) emission from the Galactic diffuse interstellar medium. No such emission was detected in any of our observed fields. Our most constraining limit was a 90% confidence upper limit of 2600 photons cm-2 sr-1 s-1 on the doublet emission in the direction (l, b) = (117.3, 50.6). Combining this with an absorption line measurement in nearly the same direction allows us to place an upper limit of 0.01 cm-3 on the electron density of the hot gas in this direction. We have placed 90% confidence upper limits of less than or equal to 10,000 photons cm-2 sr-1 s-1 on the O VI emission in 16 of our 426 observations.

  20. Plan of advanced satellite communications experiment using ETS-VI

    Science.gov (United States)

    Shiomi, Tadashi

    1988-01-01

    Communications Research Laboratory (CRL, Ministry of Posts and Telecommunications, Japan) has been engaged in development of three advanced satellite communication payloads aiming at experiments by Japan's 2-ton class Engineering Test Satellite VI (ETS-VI) which is to be launched in H-II rocket by NASDA in August 1992. CRL's three experimental systems are: (1) S-band inter-satellite communications; (2) millimeter-wave inter-satellite and personal-satellite communications; and (3) optical inter-satellite communications. CRL develops experimental optical communication system with telescope of 75 mm diameter which has gimbal mirror beam pointing/tracking mechanism. The onboard system has fundamental optical communication functions with laser diode transmitter of wavelength 0.83 micron, laser beam point-ahead mechanism, receiver of wavelength 0.51 micron, modulation/demodulation subsystem, and so on.

  1. Uranium (Vi) sorption onto zirconium diphosphate chemically modified

    International Nuclear Information System (INIS)

    This work deals with the uranium (Vi) speciation after sorption onto zirconium diphosphate (ZrP2O7) surface, hydrated and in a surface modified with organic acids. Oxalic and citric acids were chosen to modify the ZrP2O7 surface because they have poly carboxylic groups and they mimic the organic matter in nature. Thus the interest of this work is to evaluate the uranium (Vi) sorption edge at different s ph values in natural and modified surfaces. The luminescence technique (fluorescence and phosphorescence, respectively) was used for the quantification and speciation of uranyl sorbed at the zirconium diphosphate interface. The fluorescence experiment, showed that adsorption of uranyl on surface of zirconium diphosphate tends to 100%. The speciation shows that there are different complexes in surface which were formed between zirconium diphosphate and uranyl, since it is produced a displacement of wavelength in fluorescence spectra of each system. (Author)

  2. TORSION OF THE VERMIFORM APPENDIX: A CASE REPORT

    Directory of Open Access Journals (Sweden)

    Dr. Imtiaz Wani

    2009-07-01

    Full Text Available Torsion of the vermiform appendix is a rare condition with few cases reported in the literature. Various factors predispose to torsion. Various factors predispose to torsion. We report a case of primary torsion of the vermiform appendix. The clinical presentation was indistinguishable from acute appendicitis and the diagnosis was made at operation. Appendix was preileal in position and the direction of torsion was anticlockwise. There was intrinsic torsion with no obvious factor for torsion identified. Appendectomy was performed.

  3. Endometriosis of the Appendix Resulting in Perforated Appendicitis

    OpenAIRE

    Hasegawa, Toru; Yoshida, Koichi; Matsui, Kazuhiro

    2007-01-01

    Endometriosis is a relatively common disease among women of reproductive age. However, gastrointestinal endometriosis is rare and endometriosis of the appendix resulting in perforated appendicitis is even rarer. We experienced a case of endometriosis of the appendix manifesting as panperitonitis caused by perforation of the appendix. The patient was a 35-year-old woman who was hospitalized with an acute abdomen. She was diagnosed with panperitonitis and underwent urgent laparotomy. When perfo...

  4. ENDF-201: ENDF/B-VI summary documentation

    Energy Technology Data Exchange (ETDEWEB)

    Rose, P.F. (comp.)

    1991-10-01

    Responsibility for oversight of the ENDF/B Evaluated Nuclear Data file lies with the Cross Section Evaluation Working Group (CSEWG), which is comprised of representatives from various governmental and industrial laboratories in the United States. Individual evaluations are provided by scientists at several US laboratories, including significant contributions by scientists from all over the world. In addition, ENDF/B-VI includes for the first time complete evaluations for three materials that were provided from laboratories outside the US. All data are checked and reviewed by CSEWG, and the data file is maintained and issued by the National Nuclear Data Center at Brookhaven National Laboratory. The previous version of the library, ENDF/B-V, was issued in 1979, and two revisions to the data file were provided in subsequent years, the latest occurring in 1981. A total of 75 new or extensively modified neutron sublibrary evaluations are included in ENDF/B-VI, and are summarized in this document. One incident proton sublibrary is described for Fe{sup 56}. The remaining evaluations in ENDF/B-VI have been carried over from earlier versions of ENDF, and have been updated to reflect the new formats. The release of ENDF/B-VI was carried out between January and June of 1990, with groups of materials being released on tapes.'' Table 1 is an index to the evaluation summaries, and includes the material identification or MAT number, the responsible laboratory, and the tape'' number. These evaluations have been released without restrictions on their distribution or use.

  5. ENDF-201: ENDF/B-VI summary documentation

    Energy Technology Data Exchange (ETDEWEB)

    Rose, P.F. [comp.

    1991-10-01

    Responsibility for oversight of the ENDF/B Evaluated Nuclear Data file lies with the Cross Section Evaluation Working Group (CSEWG), which is comprised of representatives from various governmental and industrial laboratories in the United States. Individual evaluations are provided by scientists at several US laboratories, including significant contributions by scientists from all over the world. In addition, ENDF/B-VI includes for the first time complete evaluations for three materials that were provided from laboratories outside the US. All data are checked and reviewed by CSEWG, and the data file is maintained and issued by the National Nuclear Data Center at Brookhaven National Laboratory. The previous version of the library, ENDF/B-V, was issued in 1979, and two revisions to the data file were provided in subsequent years, the latest occurring in 1981. A total of 75 new or extensively modified neutron sublibrary evaluations are included in ENDF/B-VI, and are summarized in this document. One incident proton sublibrary is described for Fe{sup 56}. The remaining evaluations in ENDF/B-VI have been carried over from earlier versions of ENDF, and have been updated to reflect the new formats. The release of ENDF/B-VI was carried out between January and June of 1990, with groups of materials being released on ``tapes.`` Table 1 is an index to the evaluation summaries, and includes the material identification or MAT number, the responsible laboratory, and the ``tape`` number. These evaluations have been released without restrictions on their distribution or use.

  6. Spectrophotometric study of neptunium (VI) complexation by nitrate ions

    International Nuclear Information System (INIS)

    Neptunium(VI) complexation by nitrate ions was investigated by visible and near-infrared spectrophotometry, a technique suitable for observing the appearance and evolution of the species in solution. In the absence of reference spectra for Np(VI) nitrate- complexes, mathematical (factor analysis) tools were used to interpret the spectra. These chemo-metric techniques were first tested and validated on a simpler chemical system: Np(VI)complexation by the SiW11O398- anion. The test media used to investigate Np(VI) nitrate- complexes generally contain nitrate and perchlorate salts at high concentrations (high ionic strength). Media effects arising from the presence of cations, acidity or the perchlorate ion concentration are therefore significant, and no doubt account for the scattered values of the complexation constants published in the literature. The evolution of the neptunium spectra according to the parameters of the reaction medium illustrated these effects and allowed them to be quantified by a global 'perturbation constant'. In order to minimize the spectrum modifications due to media effects, the neptunium nitrate-complexes were studied at constant ionic strength in weak acidic media (2 mol.kg-1H2O) in the presence of sodium salts. The bulk formation constants and the spectrum of the NpO2(NO3)+ complex were determined for ionic strength values of 2.2, 4, 6 and 8 mol.kg-1H2O. The constants remained on the same order of magnitude regardless of the ionic strength; the thermodynamic constant β10 determined from them according to specific interaction theory is thus probably of little significance. Conversely, the bulk constants can be corrected for the effects of the perchlorate ions by taking the global 'perturbation constant' into account. (author)

  7. Morphological Heterogeneity of Layer VI Neurons in Mouse Barrel Cortex

    OpenAIRE

    Chen, Chia-Chien; Abrams, Svetlana; Pinhas, Alex; Brumberg, Joshua C.

    2009-01-01

    Understanding the basic neuronal building blocks of the neocortex is a necessary first step toward comprehending the composition of cortical circuits. Neocortical layer VI is the most morphologically diverse layer and plays a pivotal role in gating information to the cortex via its feedback connection to the thalamus and other ipsilateral and callosal corticocortical connections. The heterogeneity of function within this layer is presumably linked to its varied morphological composition. Howe...

  8. Voltammetry of Os(VI)-modified polysaccharides at carbon electrodes

    Czech Academy of Sciences Publication Activity Database

    Trefulka, Mojmír; Paleček, Emil

    2009-01-01

    Roč. 21, č. 15 (2009), s. 1763-1766. ISSN 1040-0397 R&D Projects: GA ČR(CZ) GA301/07/0490; GA MŠk(CZ) LC06035 Institutional research plan: CEZ:AV0Z50040507; CEZ:AV0Z50040702 Keywords : chemical modification of polysaccharides * Os(VI)L-polysaccharide adducts * pyrolytic graphite electrodes Subject RIV: BO - Biophysics Impact factor: 2.630, year: 2009

  9. ViSQOL: an objective speech quality model

    OpenAIRE

    Kokaram, Anil; KOKARAM, ANIL CHRISTOPHER; Harte, Naomi; HINES, ANDREW

    2015-01-01

    PUBLISHED Export Date: 27 August 2015 This paper presents an objective speech quality model, ViSQOL, the Virtual Speech Quality Objective Listener. It is a signal-based, full-reference, intrusive metric that models human speech quality perception using a spectro-temporal measure of similarity between a reference and a test speech signal. The metric has been particularly designed to be robust for quality issues associated with Voice over IP (VoIP) transmission. This paper describes the a...

  10. Interaction of aerobic soil bacteria with plutonium(VI)

    International Nuclear Information System (INIS)

    We studied the interaction of Pu(VI) with Pseudomonas stutzeri ATCC 17588 and Bacillus sphaericus ATCC 14577, representatives of the main aerobic groups of soil bacteria present in the upper soil layers. The accumulation studies have shown that these soil bacteria accumulate high amounts of Pu(VI). The sorption efficiency toward Pu(VI) decreased with increasing biomass concentration due to increased agglomeration of the bacteria resulting in a decreased total surface area and number of available complexing groups. Spores of Bacillus sphaericus showed a higher biosorption than the vegetative cells at low biomass concentration which decreased significantly with increasing biomass concentration. At higher biomass concentrations (> 0.7 g/L), the vegetative cells of both strains and the spores of B. sphaericus showed comparable sorption efficiencies. Investigations on the pH dependency of the biosorption and extraction studies with 0.01 M EDTA solution have shown that the biosorption of plutonium is a reversible process and the plutonium is bound by surface complexation. Optical absorption spectroscopy showed that one third of the initially present Pu(VI) was reduced to Pu(V) after 24 hours. Kinetic studies and solvent extraction to separate different oxidation states of Pu after contact with the biomass provided further information on the yield and the kinetics of the bacteria-mediated reduction. Long-term studies showed that also 16% of Pu(IV) was formed after one month. The comparison of the amount of Pu(IV) formed during that time period with literature data of the Pu(V) disproportionation, indicated that the Pu(IV) seemed to be rather the result of the disproportionation of the formed Pu(V) than of a further microbial reduction

  11. Characterization of uranium(VI) sorption by organobentonite

    International Nuclear Information System (INIS)

    The U(VI) sorption on the bentonite modified by hexadecyltrimethylammonium bromide (HDTMA) was studied in the concentration range: 0.0001-0.001 mol/dm3 in the aqueous phase and in the pH range: 3-10. The experiments concerning the pH influence on the molar absorption coefficient cb of U(VI) in the bentonite phase showed that the species: UO22+, UO2(OH)+, UO2(OH)2 UO2(OH)3-, UO2(OH)42-, (UO2)3(OH)5+, (UO2)3(OH)7-, present in the aqueous phase, are responsible for uranium sorption. Their sorption parameters K were determined and it is evident that for higher concentrations of HDTMA+ cations in the bentonite phase, i.e. for b96-b157 bentonite, the presence of anionic species: UO2(OH)3-, UO2(OH)42-, and (UO2)3(OH)7- in the aqueous phase results in the increase of U(VI) molar absorption coefficient cb in the sorbent phase.

  12. Skal vi have reklame-TV i Danmark?

    Directory of Open Access Journals (Sweden)

    Ole Prehn

    1989-08-01

    Full Text Available Under stor ståhej fik vi reklamer i 1987 (TV-Syd og året efter kom turen til næsten resten af Danmark. Seertallene lever endnu ikke op til lovens forudsætninger, og reklamesel- skabet (TVR har derfor blandet sig uhørt kraftigt i den offentlige debat om reklamernes placering og programlægningen. Dette stemmer ikke særlig godt med de vandtætte skodder mellem reklamer og programlægning, som politikerne havde lovet os. Hvilke yderligere løftebrud er nødvendige i frem- tiden, hvis vi skal have TV betalt via reklamer? Ole Prehn gennemgår de politiske forudsætninger, beregninger af de så- kaldte kontaktpriser for TV-reklame og seertallene. Han når frem til, at reklamestrukturen i TV langt fra har nået sit endelige udviklingsstade i Danmark. Vi har endnu reklame-TV til gode.

  13. Thermal detoxification and bloating of chromium(VI) with bentonite

    International Nuclear Information System (INIS)

    This study stabilizes and bloats Cr(VI)-sorbed bentonite by heating at high temperature. Cr leaching decreases with increasing temperatures. Heating the sample at 1100 oC results in a non-detectable Cr concentration in the leachate, equivalent to a Cr leaching percent less than 0.001% (i.e., Cr TCLP concentration -1 of leachate). Morphology observed with a scanning electron microscopy indicates the occurrence of sintering of the sample heated at 1100 oC. The heated samples also show the occurrence of a vesicant process at 1100 oC. X-ray absorption spectroscopy results indicate that heating at 500 oC for 4 h can convert approximately 87% Cr(VI) into Cr(III) that is negligibly toxic; Cr2O3 was detected to be the most abundant Cr species. After heating at higher temperatures, namely 900-1100 oC, almost all doped Cr(VI) is reduced to Cr(III) as inferred from the height of the pre-edge peak of XANES spectra and/or from XANES simulation.

  14. Specific extraction of chromium(VI) using supercritical fluid extraction.

    Science.gov (United States)

    Foy, G P; Pacey, G E

    2000-02-01

    In some situations, it is no longer sufficient to give a total concentration of a metal. Instead, what is required to understand the potential toxicity of a sample is the concentration of metal species or oxidation state. When developing species specific methods, the major concern is that the integrity of the species ratio is not changed. In other words, the sample preparation or the analytical method will not convert metal ions from one oxidation state to another. Normal extraction techniques and chromatography methods have shown some tendencies to change species ratios. An ideal extraction method would extract the metal efficiently while retaining the metal's oxidation state. The properties of supercritical fluids should approach the ideal of retention of oxidation states. For example, the need for speciation of chromium is obvious since Cr(III) is considered an essential element while Cr(VI) is thought to be toxic and carcinogenic. This paper presents the results of a species specific extraction of Cr(VI) using two different carbamate derivatives as the chelator. Supercritical fluid extraction (SFE) coupled with a fluorinated dithiocarbamate and a methanol modifier allows extraction of 1 ppm Cr(VI) from a solid matrix with a recovery level of 88.4+/-2.57% using the NIST standard sample. The optimized conditions using the HP 7680 supercritical fluid extractor were: 0.1 ml of methanol, 0.05 ml of pure water, and 0.01 g of chelate via a saturation chamber. PMID:18967865

  15. Nopalea cochenillifera, a potential chromium (VI) hyperaccumulator plant.

    Science.gov (United States)

    Adki, Vinayak S; Jadhav, Jyoti P; Bapat, Vishwas A

    2013-02-01

    Hexavalant chromium [Cr(VI)] tolerance and accumulation in in vitro grown Nopalea cochenillifera Salm. Dyck. plants was investigated. A micropropagation protocol was establish for a rapid multiplication of N. cochenillifera and [Cr(VI)] tolerance and accumulation was studied in in vitro grown cultures. Cr concentration was estimated by atomic absorption spectroscopy in roots and shoots to confirm plant's hyperaccumulation capacity. Plants showed tolerance up to 100 μM K(2)Cr(2)O(7) without any significant changes in root growth after 16 days treatment; whereas, chlorophyll content in plants treated with 1 and 10 μM K(2)Cr(2)O(7) were not so different than the control plant. The levels of lipid peroxidation and protein oxidation increased significantly (p 100 μM) inhibited the activities of CAT and SOD. Roots accumulated a maximum of 25,263.396 ± 1,722.672 mg Cr Kg(-1) dry weight (DW); while the highest concentration of Cr in N. cochenillifera shoots was 705.714 ± 32.324 mg Cr Kg(-1) DW. N. cochenillifera could be a prospective hyperaccumulator plant of Cr(VI) and a promising candidate for phytoremediation purposes. PMID:22914913

  16. Study of the biosorption of chromium (VI) on crosslinked-quaternary chitosan for their application on the bioremediation of waster waters

    International Nuclear Information System (INIS)

    In this work, the stoichiometric amounts of the amino-quaternaries and cross-linker were studied to produce the most stable cross-linked quaternary Chitosan (QC2). Preliminary assays were carried out to test the improvement in their mechanical and chemical properties (extreme conditions, surface area and thermogravimetry). Then, the adsorption of chromium (VI) on the QC2 was studied at changing experimental conditions like: pH, adsorbent dose, initial chromium concentration and ionic strength. Moreover, the kinetics of the process was also evaluated as well as the optimization, the desorption of chromium (VI) from the adsorbent for metal recovery and adsorbent recycling. Finally, was characterized by using instrumental techniques such as FTIR, SEM. These tools allowed us to investigate the adsorption mechanism. The calculated parameters indicate a high adsorbent/adsorbato affinity for QC2 with a maximum adsorption capacity of 208 mg g-1 for Cr (VI), elucidating its potential use for the removal of chromium from aqueous solutions. Also showed a pseudo-second order adsorption kinetics with a velocity constant of 0.289 g.mg-1.min-1. Desorption of chromium was efficiently accomplish with a mixture of 1M of NaCl and NaOH, reaching a recovery up to 99.78% of the initial metal concentration at pH 4.5. Finally, high ionic strength shows an effect on the adsorption of chromium (VI) onto the studied adsorbents. (author)

  17. Characterization and determination of the thermodynamic and kinetic properties of the adsorption of molybdenum (VI) onto microcrystalline anthracene modified with 8-hydroxyquinoline

    International Nuclear Information System (INIS)

    A reliable and effective method for the determination of trace molybdenum in effluents is proposed. Molybdenum (VI) is analyzed by Microwave Plasma Torch Optical Emission Spectrometry (MPT-OES) based on the adsorption collection onto microcrystalline anthracene modified with 8-hydroxyquinoline. The possible reaction mechanism was discussed in detail and the optimum conditions for adsorption of Mo (VI) were confirmed. The experimental data were fitted well with the pseudo-second-order kinetic model and Langmuir model at all studied temperatures. The calculated thermodynamic parameters (ΔGT, ΔHT and ΔST) showed that the adsorption of molybdenum onto microcrystalline anthracene was feasible, spontaneous and endothermic at 280-320 K. The recovery of this method is in the range of 96.5%-103.3% with preconcentration factor of 100 and the limit detection after preconcentration is 0.078 μg L-1. The proposed method has been successfully applied to the determination of trace Mo (VI) in environmental water samples with satisfactory results. Highlights: → The preparation of the sorbent, MICRO-AN-8-hydroxyquinoline, is relatively simple. → Excellent properties of the sorbent have been illustrated in detail. → Exhaustive data concerning Mo(VI) adsorption behavior are provided. → Adsorption mechanism is firstly discussed from the view of ion-exchange reaction. → Offer reference for the studies on other metal ions adsorption onto the sorbent.

  18. Characterization and determination of the thermodynamic and kinetic properties of the adsorption of molybdenum (VI) onto microcrystalline anthracene modified with 8-hydroxyquinoline

    Energy Technology Data Exchange (ETDEWEB)

    Wang Xu [College of Chemistry and Environmental Science, Henan Normal University, Henan Key Laboratory for Environmental Pollution Control, Xinxiang, Henan 453007 (China); Zhang Yan [College of Chemistry and Chemical Engineering, Henan Institute of Science and Technology, Xinxiang, Henan 453003 (China); Li Quanmin, E-mail: mercury6068@hotmail.com [College of Chemistry and Environmental Science, Henan Normal University, Henan Key Laboratory for Environmental Pollution Control, Xinxiang, Henan 453007 (China)

    2011-12-01

    A reliable and effective method for the determination of trace molybdenum in effluents is proposed. Molybdenum (VI) is analyzed by Microwave Plasma Torch Optical Emission Spectrometry (MPT-OES) based on the adsorption collection onto microcrystalline anthracene modified with 8-hydroxyquinoline. The possible reaction mechanism was discussed in detail and the optimum conditions for adsorption of Mo (VI) were confirmed. The experimental data were fitted well with the pseudo-second-order kinetic model and Langmuir model at all studied temperatures. The calculated thermodynamic parameters ({Delta}G{sup T}, {Delta}H{sup T} and {Delta}S{sup T}) showed that the adsorption of molybdenum onto microcrystalline anthracene was feasible, spontaneous and endothermic at 280-320 K. The recovery of this method is in the range of 96.5%-103.3% with preconcentration factor of 100 and the limit detection after preconcentration is 0.078 {mu}g L{sup -1}. The proposed method has been successfully applied to the determination of trace Mo (VI) in environmental water samples with satisfactory results. Highlights: {yields} The preparation of the sorbent, MICRO-AN-8-hydroxyquinoline, is relatively simple. {yields} Excellent properties of the sorbent have been illustrated in detail. {yields} Exhaustive data concerning Mo(VI) adsorption behavior are provided. {yields} Adsorption mechanism is firstly discussed from the view of ion-exchange reaction. {yields} Offer reference for the studies on other metal ions adsorption onto the sorbent.

  19. N,N,N',N'-tetrahexylsuccinylamide as a new extractant for the extraction of nitric acid, uranium(VI) and thorium(IV) ions

    International Nuclear Information System (INIS)

    N,N,N',N'-tetrahexylsuccinylamide (THSA) was used for the extraction of U(VI) and Th(IV) ions from nitric acid media into n-dodecane. Extraction distribution ratios of U(VI) and Th(IV) as a function of nitric acid concentration, extractant concentration and temperature have been studied. It was found that THSA as a new extractant is superior in some aspects to TBP for extraction of U(VI) and Th(IV). The extraction of nitric acid was also investigated. At low acidity, the main adduct of THSA and HNO3 is THSA x HNO3. THSA x (HNO3)2 and THSA x (HNO3)3 also formed at high acidity. The composition of the species, equilibrium constants and enthalpies of the extraction reactions have also been calculated. The suggested formation of the 1:2:1 ratio of uranyl(IV) ion and the 1:4:2 ratio of thorium(IV) ion, nitrate ion and THSA as the extracted species was further confirmed by the IR spectra of U(VI) and Th(IV) extracts. (author)

  20. Solvent extraction of uranium(VI) and thorium(IV) by N,N'-di-p-tolylpyridine-2,6-dicarboxamide from nitric acid solution

    International Nuclear Information System (INIS)

    Synthesis and characterization of N,N′-di-p-tolylpyridine-2,6-dicarboxamide (DTPDA) was carried out and used for extraction of U(VI) and Th(IV) from nitric acid solutions. The processes of extraction were determined by the slope analysis and by analyzing a function that allows the simultaneous treatment of all the experimental points obtained in different conditions. The different factors affecting the extraction distribution ratio(D) of U(VI) and Th(IV) (extraction concentration, concentrations of nitric acid, salting-out agent NaNO3 concentration, equilibration time and temperature) were investigated. The results obtained indicated that the extraction species of U(VI) and Th(IV) are mainly extracted as UO2(NO3)2 · 1.5DTPDA and Th(NO3)4 · 1.5DTPDA. The related thermodynamic functions were calculated. Back-extraction of U(VI) and Th(IV) from organic phases was also studied. (author)

  1. A spectroscopic study of the effect of ligand complexation on the reduction of uranium(VI) by anthraquinone-2,6-disulfonate (AH2DS)

    International Nuclear Information System (INIS)

    In this paper, the reduction rate of uranyl complexes with hydroxide, carbonate, EDTA, and desferriferrioxamine B (DFB) by anthraquinone-2,6-disulfonate (AH2DS) is studied by stopped-flow kinetic technique under anoxic atmosphere. The apparent reaction rates varied with ligand type, solution pH, and U(VI) concentration. For each ligand, a single largest pseudo-1st order reaction rate constant, kobs, within the studied pH range was observed, suggesting the influence of pH-dependent speciation on the U(VI) reduction rate. The maximum reaction rate found in each case followed the order of OH- > CO32- > EDTA > DFB, in reverse order of the trend of the thermodynamic stability of the uranyl complexes and ionic sizes of the ligands. The pH-dependent rates were modeled using a second-order rate expression that was assumed to be dependent on a single U(VI) complex and an AH2DS species. By quantitatively comparing the calculated and measured apparent rate constants as a function of pH, species AHDS3- was suggested as the primary reductant in all cases examined. Species UO2CO3(aq), UO2HEDTA-, and (UO2)2(OH)22+ were suggested as the principal electron acceptors among the U(VI) species mixture in each of the carbonate, EDTA, and hydroxyl systems, respectively. (orig.)

  2. Characteristics of potential repository wastes. Volume 3, Appendix 3A, ORIGEN2 decay tables for immobilized high-level waste; Appendix 3B, Interim high-level waste forms

    Energy Technology Data Exchange (ETDEWEB)

    1992-07-01

    This appendix presents the results of decay calculations using the ORIGEN2 code to determine the radiological properties of canisters of immobilized high-level waste as a function of decay time for decay times up to one million years. These calculations were made for the four HLW sites (West Valley Demonstration Project, Savannah River Site, Hanford Site, and Idaho National Engineering Laboratory) using the composition data discussed in the HLW section of this report. Calculated ({alpha},n) neutron production rates are also shown.

  3. CT appearance of the normal appendix in adults

    Energy Technology Data Exchange (ETDEWEB)

    Tamburrini, Stefania [Universita' di Napoli Federico II, Dip. Sc. Biomorfologiche e Funzionali, Naples (Italy); UCSD Medical Center, Department of Radiology, San Diego, CA (United States); Brunetti, Arturo [Universita' di Napoli Federico II, Dip. Sc. Biomorfologiche e Funzionali, Naples (Italy); Brown, Michele; Sirlin, Claude B.; Casola, Giovanna [UCSD Medical Center, Department of Radiology, San Diego, CA (United States)

    2005-10-01

    The aims of this study were to identify (1) the normal range of the appendix on computed tomography (CT), (2) the correlation of patient age and sex with the visibility and appearance of the appendix on CT, and (3) the normal variations in wall thickness, intraluminal content, and location of the appendix. Three hundred seventy-two outpatients underwent abdominopelvic CT. The scans were reviewed on the picture archiving and communication system and appendiceal outer-to-outer wall diameter, wall thickness, location, content and its correlation with appendix diameter were analyzed. The appendix was visualized in 305/372 patients. Its location relative to the cecum was highly variable. The diameter range was 3-10 mm; in 42% of cases the diameter was greater than 6 mm. When the intraluminal content (185/305) was visualized, the diameter was slightly superior to the mean (p=0.0156). In 329 CT scans in which oral contrast material was given, the appendix was filled by contrast material in 74/329 patients. The appendix wall thickness was measurable in 22/305 patients (average 0.15 cm). There is significant overlap between the normal and abnormal CT appearance of the appendix. Consequently the diagnosis of acute appendicitis should be based not only on the appearance of the appendix but also on the presence of secondary signs. (orig.)

  4. CT appearance of the normal appendix in adults

    International Nuclear Information System (INIS)

    The aims of this study were to identify (1) the normal range of the appendix on computed tomography (CT), (2) the correlation of patient age and sex with the visibility and appearance of the appendix on CT, and (3) the normal variations in wall thickness, intraluminal content, and location of the appendix. Three hundred seventy-two outpatients underwent abdominopelvic CT. The scans were reviewed on the picture archiving and communication system and appendiceal outer-to-outer wall diameter, wall thickness, location, content and its correlation with appendix diameter were analyzed. The appendix was visualized in 305/372 patients. Its location relative to the cecum was highly variable. The diameter range was 3-10 mm; in 42% of cases the diameter was greater than 6 mm. When the intraluminal content (185/305) was visualized, the diameter was slightly superior to the mean (p=0.0156). In 329 CT scans in which oral contrast material was given, the appendix was filled by contrast material in 74/329 patients. The appendix wall thickness was measurable in 22/305 patients (average 0.15 cm). There is significant overlap between the normal and abnormal CT appearance of the appendix. Consequently the diagnosis of acute appendicitis should be based not only on the appearance of the appendix but also on the presence of secondary signs. (orig.)

  5. Analytical applications of N-phenyl-n-butyro hydroxamic and N-p-tolyl-n-butyro hydroxamic acids towards chromium (VI), copper (II), iron (III) and uranium (VI)

    International Nuclear Information System (INIS)

    Two aliphatic hydroxamic acids were prepared; N-phenyl-n-butyro hydroxamic acid and N-p-tolyl-n-butyro hydroxamic acid, by the reaction of β-phenylhydroxylamine and p-tolyl hydroxylamine with n-butyryl chloride. The acids were identified by: their melting points, characteristic reactions with acidic solutions of vanadium (V) and iron (III), infrared spectroscopy, nitrogen content and molecular weight determination. The extractability of these acids towards Cr (VI), Cu (II), Fe (III) and U (VI) were investigated at different pH values and molar acid concentrations. N-phenyl-n- butyro hydroxamic acid has a maximum extraction (98.80%) for Cr (VI) at 4 M H2SO4, (83.25%) for Cu (II) at pH 6, (99.17%) for Fe (III) at pH 5 and (99.76%) at 4 M HNO3 for U (VI) respectively. N-p-tolyl-n-butyro hydroxamic acid has a maximum extraction (98.40%) for Cr (VI)at 4 M H2 SO4, (81.30%) for Cu (II) at pH 6, (92.80%) for Fe (III) at pH 5 and (99.64%) for U (VI) at 4 M HNO3, respectively. The ratios of the metal to ligands were determined by job method (continuous variation method) and were found to be 1:2 for Cr (VI) and U (VI). (Author)

  6. 40 CFR Appendix Xviii to Part 86 - Statistical Outlier Identification Procedure for Light-Duty Vehicles and Light Light-Duty Trucks...

    Science.gov (United States)

    2010-07-01

    ..., Subpart R XVIII Appendix XVIII to Part 86 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY... Light-Duty Vehicles and Light Light-Duty Trucks Certifying to the Provisions of Part 86, Subpart R... calculate the residual at the deleted point, denoted as (yi − yi′). Obtain a statistic by dividing (yi −...

  7. Temperature effect on the retention of U(VI) by SrTiO{sub 3}; Effet de la temperature sur la retention de U(VI) par SrTiO{sub 3}

    Energy Technology Data Exchange (ETDEWEB)

    Garcia Rosales, G

    2007-11-15

    The purpose of this research was the study of the interaction mechanisms between U(VI) ions and SrTiO{sub 3} surfaces versus pH and temperature: 25, 50, 75 and 90 C. Firstly, a physicochemical characterization was realized (DRX, MEB, FTIR) and the surface site density was determined. The potentiometric titration data were simulated, for each temperature, using the constant capacitance model and taking into account bath protonation of the {identical_to}Sr-OH surface sites and deprotonation of the {identical_to}Ti-OH ones (one pK{sub a} model). Both enthalpy and entropy changes, corresponding to the surface acid-base reactions, were evaluated using the van't Hoff relation. U(VI) was sorbed onto SrTiO{sub 3} powder in the pH range 0.5-5.0 with an U(VI) initial concentration 1.10{sup -4} M. By TRLIFS two U(VI) complexes were detected associated with two lifetime values (60 {+-} 5 and 12 {+-} 2 {mu}s at 25 C). The sorption edges were simulated using FITEQL 4.0 software. The surface complexation constants of the system SrTiO{sub 3}/U(VI) between 25 and 90 C temperature range were thus obtained with the constant capacitance model considering two reactive surface sites. It reveals that two types of surface complex, namely [({identical_to}SrOH)({identical_to}TiOH)UO{sub 2}]{sup 2+} and [({identical_to}TiOH)({identical_to}TiO)UO{sup 2+}]{sup 2+}, are needed to properly describe the experimental observations. By application of the van't Hoff equation, Delta{sub R}S{sup 0} and Delta{sub R}H{sup 0} were obtained, which indicated an endothermic sorption process. Finally, an energy transfer study was realised by TRLIFS. The energy transfer between Tb{sup 3+} and Eu{sup 3+} ions sorbed onto SrTiO{sub 3} powders were investigated. The results showed that the energy transfer between Tb{sup 3+} and Eu{sup 3+} is a non-radiative process and follows a dipole-dipole type interaction. A formalism based on the Dexter and the Inokuti-Hirayama theories was used to calculate the

  8. IR Fingerprints of U(VI) Nitrate Monoamides Complexes: A Joint Experimental and Theoretical Study

    International Nuclear Information System (INIS)

    Infrared spectra or 0. 5 mol. L-1 uranium(VI) nitrate monoamide complexes in toluene have been recorded and compared with infrared spectra calculated by DFT. The investigated monoamides were N, N-dimethylformamide (DMF), N, N-dibutyl-formamide (DBF), and N, N-dicyclohexyl-formamide (DeHF). The validity of DFT calculations for describing uranium nitrate monoamide complexes has been confirmed as a fair agreement between experimental and calculated spectra was obtained. Furthermore, a topological analysis of the electron density has been carried out to characterize monoamide-uranium interactions. From this work, it appears that the increase of stability of uranyl-monoamide complexes may be directly linked to the degree of polarization of the ligands in interaction with uranyl-nitrate. Among the investigated monoamides, the most stable complex is UO2(NO3)2.2DcHF. This complex is characterized by a high positive charge delocalization in the outer part or the ligand molecule, which leads to a more concentrated positive charge close to the uranyl cation (UO22+), thus strengthening the electrostatic interaction between the metal and the ligand. (authors)

  9. Spectrum and energy levels of five-times ionized zirconium (Zr VI)

    Science.gov (United States)

    Reader, Joseph; Lindsay, Mark D.

    2016-02-01

    We carried out a new analysis of the spectrum of five-times-ionized zirconium Zr VI. For this we used sliding-spark discharges together with normal- and grazing-incidence spectrographs to observe the spectrum from 160 to 2000 Å. These observations showed that the analysis of this spectrum by Khan et al (1985 Phys. Scr. 31 837) contained a significant number of incorrect energy levels. We have now classified ˜420 lines as transitions between 23 even-parity levels 73 odd-parity levels. The 4s24p5, 4s4p6, 4s24p44d, 5s, 5d, 6s configurations are now complete, although a few levels of 4s24p45d are tentative. We determined Ritz-type wavelengths for ˜135 lines from the optimized energy levels. The uncertainties range from 0.0003 to 0.0020 Å. Hartree-Fock calculations and least-squares fits of the energy parameters to the observed levels were used to interpret the observed configurations. Oscillator strengths for all classified lines were calculated with the fitted parameters. The results are compared with values for the level energies, percentage compositions, and transition probabilities from recent ab initio theoretical calculations. The ionization energy was revised to 777 380 ± 300 cm-1 (96.38 ± 0.04 eV).

  10. Cr (VI) remediation by indigenous bacteria in soils contaminated by chromium-containing slag

    International Nuclear Information System (INIS)

    Hexavalent chromium (Cr) is a toxic element causing serious environmental threat. Recently, more and more attention is paid to the bio-remediation of Cr (VI) in the contaminated soils. Cr (VI) remediation by indigenous bacteria in soils contaminated by chromium-containing slag at a steel-alloy factory in Hunan Province, China, was investigated in the present study. The results showed that when sufficient nutrients were amended into the contaminated soils, total Cr (VI) concentration declined from the initial value of 462.8 to 10 mg kg-1 at 10 days and the removal rate was 97.8%. Water soluble Cr (VI) decreased from the initial concentration of 383.8 to 1.7 mg kg-1. Exchangeable Cr (VI) and carbonates-bound Cr (VI) were removed by 92.6% and 82.4%, respectively. Meanwhile, four Cr (VI) resistant bacterial strains were isolated from the soil under the chromium-containing slag. Only one strain showed a high ability for Cr (VI) reduction in liquid culture. This strain was identified as Pannonibacter phragmitetus sp. by gene sequencing of 16S rRNA. X-ray photoelectron spectroscope (XPS) analysis indicated that Cr (VI) was reduced into trivalent chromium. The results suggest that indigenous bacterial strains have potential application for Cr (VI) remediation in the soils contaminated by chromium-containing slag.

  11. Cr (VI) remediation by indigenous bacteria in soils contaminated by chromium-containing slag.

    Science.gov (United States)

    Chai, Liyuan; Huang, Shunhong; Yang, Zhihui; Peng, Bing; Huang, Yan; Chen, Yuehui

    2009-08-15

    Hexavalent chromium (Cr) is a toxic element causing serious environmental threat. Recently, more and more attention is paid to the bio-remediation of Cr (VI) in the contaminated soils. Cr (VI) remediation by indigenous bacteria in soils contaminated by chromium-containing slag at a steel-alloy factory in Hunan Province, China, was investigated in the present study. The results showed that when sufficient nutrients were amended into the contaminated soils, total Cr (VI) concentration declined from the initial value of 462.8 to 10 mg kg(-1) at 10 days and the removal rate was 97.8%. Water soluble Cr (VI) decreased from the initial concentration of 383.8 to 1.7 mg kg(-1). Exchangeable Cr (VI) and carbonates-bound Cr (VI) were removed by 92.6% and 82.4%, respectively. Meanwhile, four Cr (VI) resistant bacterial strains were isolated from the soil under the chromium-containing slag. Only one strain showed a high ability for Cr (VI) reduction in liquid culture. This strain was identified as Pannonibacter phragmitetus sp. by gene sequencing of 16S rRNA. X-ray photoelectron spectroscope (XPS) analysis indicated that Cr (VI) was reduced into trivalent chromium. The results suggest that indigenous bacterial strains have potential application for Cr (VI) remediation in the soils contaminated by chromium-containing slag. PMID:19246154

  12. Cr (VI) remediation by indigenous bacteria in soils contaminated by chromium-containing slag

    Energy Technology Data Exchange (ETDEWEB)

    Chai Liyuan; Huang Shunhong [School of Metallurgical Science and Engineering, Central South University, Changsha 410083 (China); Yang Zhihui, E-mail: yangzh@mail.csu.edu.cn [School of Metallurgical Science and Engineering, Central South University, Changsha 410083 (China); Peng Bing; Huang Yan; Chen Yuehui [School of Metallurgical Science and Engineering, Central South University, Changsha 410083 (China)

    2009-08-15

    Hexavalent chromium (Cr) is a toxic element causing serious environmental threat. Recently, more and more attention is paid to the bio-remediation of Cr (VI) in the contaminated soils. Cr (VI) remediation by indigenous bacteria in soils contaminated by chromium-containing slag at a steel-alloy factory in Hunan Province, China, was investigated in the present study. The results showed that when sufficient nutrients were amended into the contaminated soils, total Cr (VI) concentration declined from the initial value of 462.8 to 10 mg kg{sup -1} at 10 days and the removal rate was 97.8%. Water soluble Cr (VI) decreased from the initial concentration of 383.8 to 1.7 mg kg{sup -1}. Exchangeable Cr (VI) and carbonates-bound Cr (VI) were removed by 92.6% and 82.4%, respectively. Meanwhile, four Cr (VI) resistant bacterial strains were isolated from the soil under the chromium-containing slag. Only one strain showed a high ability for Cr (VI) reduction in liquid culture. This strain was identified as Pannonibacter phragmitetus sp. by gene sequencing of 16S rRNA. X-ray photoelectron spectroscope (XPS) analysis indicated that Cr (VI) was reduced into trivalent chromium. The results suggest that indigenous bacterial strains have potential application for Cr (VI) remediation in the soils contaminated by chromium-containing slag.

  13. Microstructural analyses of Cr(VI) speciation in chromite ore processing Residue (COPR)

    Energy Technology Data Exchange (ETDEWEB)

    CHRYSOCHOOU, MARIA; FAKRA, SIRINE C .; Marcus, Matthew A.; Moon, Deok Hyun; Dermatas, Dimitris

    2010-03-01

    The speciation and distribution of Cr(VI) in the solid phase was investigated for two types of chromite ore processing residue (COPR) found at two deposition sites in the United States: gray-black (GB) granular and hard brown (HB) cemented COPR. COPR chemistry and mineralogy were investigated using micro-X-ray absorption spectroscopy and micro-X-ray diffraction, complemented by laboratory analyses. GB COPR contained 30percent of its total Cr(VI) (6000 mg/kg) as large crystals(>20 ?m diameter) of a previously unreported Na-rich analog of calcium aluminum chromate hydrates. These Cr(VI)-rich phases are thought to be vulnerable to reductive and pH treatments. More than 50percent of the Cr(VI) was located within nodules, not easily accessible to dissolved reductants, and bound to Fe-rich hydrogarnet, hydrotalcite, and possibly brucite. These phases are stable over a large pH range, thus harder to dissolve. Brownmilleritewasalso likely associated with physical entrapment of Cr(VI) in the interior of nodules. HB COPR contained no Cr(VI)-rich phases; all Cr(VI) was diffuse within the nodules and absent from the cementing matrix, with hydrogarnet and hydrotalcite being the main Cr(VI) binding phases. Treatment ofHBCOPRis challenging in terms of dissolving the acidity-resistant, inaccessible Cr(VI) compounds; the same applies to ~;;50percent of Cr(VI) in GB COPR.

  14. Synthesis and physico-chemical characteristics of some dioxouranium (VI) complexes of N-isonicotinamido-3-methoxy-4-hydroxy benzalaldimine and n-isonicotinamidocinnamalaldimine

    International Nuclear Information System (INIS)

    A series of 12 new complexes of dioxouranium (VI) with hydrazones of isonicotinic acid hydrazide, viz., N-isonicotinamido- cinnamalal-dimine (INH-CIN) and N-isonicotinamido-3-methoxy-4-hydroxy benazaldimine (INH-VAN) having the general composition UO2X2.nl (X=Br-,I-,CH3COOH-, NO3-,NCS-,n=2;X=ClO-4-,n=3;L=INH-VAN or INH-CIN) were prepared in non-aqueous media and characterized on the basis of elemental analyses, electrical conductivity, magnetic moment and IR spectral studies. In all the complexes these ligands act as neutral bidentate (N,O) ligands. In all dioxouranium (VI) complexes, the υ1 and υ3 modes are assigned in the 845-825 cm1 and 930-910 cm1 resp. Wilson's G-F matrix method was used to determine the stretching and interaction force-constants from which the U-O bond distances were calculated using Badger's formula. The calculated data shows that U-O bond length decreases with increase in the value of symmetric stretching frequency (υ1). A plot of (υ1+υ3) vs. force constants gave a straight line. The calculated values of the U-O bond distances in the present complexes are close to 1.73-1.74 A. The probable coordination number U (VI) is 8 or 10, depending on the nature of anions. Thermal properties are also discussed. (author)

  15. Mucopolysaccharidosis VI in cats - clarification regarding genetic testing.

    Science.gov (United States)

    Lyons, Leslie A; Grahn, Robert A; Genova, Francesca; Beccaglia, Michela; Hopwood, John J; Longeri, Maria

    2016-01-01

    The release of new DNA-based diagnostic tools has increased tremendously in companion animals. Over 70 different DNA variants are now known for the cat, including DNA variants in disease-associated genes and genes causing aesthetically interesting traits. The impact genetic tests have on animal breeding and health management is significant because of the ability to control the breeding of domestic cats, especially breed cats. If used properly, genetic testing can prevent the production of diseased animals, causing the reduction of the frequency of the causal variant in the population, and, potentially, the eventual eradication of the disease. However, testing of some identified DNA variants may be unwarranted and cause undo strife within the cat breeding community and unnecessary reduction of gene pools and availability of breeding animals. Testing for mucopolysaccharidosis Type VI (MPS VI) in cats, specifically the genetic testing of the L476P (c.1427T>C) and the D520N (c.1558G>A) variants in arylsulfatase B (ARSB), has come under scrutiny. No health problems are associated with the D520N (c.1558G>A) variant, however, breeders that obtain positive results for this variant are speculating as to possible correlation with health concerns. Birman cats already have a markedly reduced gene pool and have a high frequency of the MPS VI D520N variant. Further reduction of the gene pool by eliminating cats that are heterozygous or homozygous for only the MPS VI D520N variant could lead to more inbreeding depression effects on the breed population. Herein is debated the genetic testing of the MPS VI D520N variant in cats. Surveys from different laboratories suggest the L476P (c.1427T>C) disease-associated variant should be monitored in the cat breed populations, particularly breeds with Siamese derivations and outcrosses. However, the D520N has no evidence of association with disease in cats and testing is not recommended in the absence of L476P genotyping. Selection

  16. Synergistic effect of HBMPPT with PSO, DOSO and TBP on the extraction of U(VI) and on the separation of U(VI) and Th(IV)

    International Nuclear Information System (INIS)

    Some popular neutral extractants (PSO-petroleum sulfoxide, DOSO-di-n-octyl sulfoxide, TBP-tributylphosphate etc.) were chosen as synergist to study the synergistic effect on the extraction reaction with HBMPPT (4-benzoyl-2,4-dihydro-5-methyl-2-phenyl-3H-pyrazol-3-thione) for U(VI), and the synergistic separation ability of HBMPPT for U(VI) and Th(IV). The synergistic extraction ability shown by the studied systems for U(VI) is as follows: PSO > DOSO > TBP, and the same sequence was also verified for the separation coefficient of U(VI) and Th(IV). The synergistic complexes may be presented as: UO2NO3 x BMPPT x S and UO2(BMPPT)2 x S for U(VI) (S is PSO, DOSO or TBP). (author)

  17. Distillation Calculations with a Programmable Calculator.

    Science.gov (United States)

    Walker, Charles A.; Halpern, Bret L.

    1983-01-01

    Describes a three-step approach for teaching multicomponent distillation to undergraduates, emphasizing patterns of distribution as an aid to understanding the separation processes. Indicates that the second step can be carried out by programmable calculators. (A more complete set of programs for additional calculations is available from the…

  18. ENDF/B VI iron validation onpca-replica (H2O/FE) shielding benchmark experiment

    Energy Technology Data Exchange (ETDEWEB)

    Pescarini, M. [ENEA, Bologna (Italy). Centro Ricerche Energia `E. Clementel` - Area Energia e Innovazione

    1994-05-01

    The PCA-REPLICA (H2O/Fe) neutron shielding benchmark experiment is analysed using the SN 2-D DOT 3.5 code and the 3-D-equivalent flux synthesis method. This engineering benchmark reproduces the ex-core radial geometry of a PWR, including a mild steel reactor pressure vessel (RPV) simulator, and is dsigned to test the accuracy of the calculation of the in-vessel neutron exposure parameters (fast fluence and iron displacement rates). This accuracy is strongly dependent on the quality of the iron neutron cross section used to describe the nuclear reactions within the RPV simulator. In particular, in this report, the cross sections based on the ENDF/B VI iron data files are tested, through a comparison of the calculated integral and spectral results with the corresponding experimental data. In addition, the present results are compared, on the same benchmark experiment, with those of a preceding ENEA (Italian Agency for Energy, New Technologies and Environment)-Bologna validation of the JEF-2.1 iron cross sections. The integral result comparison indicates that, for all the thresold detectors considered (Rh-103 (n,n) Rh-103m, In-115 (n,n) In-115 (n,n) In-115m and S-32 (n.p) P-32), the ENDF/B VI iron data produce better results than the JEF-2.1 iron data. In particular, in the ENDF/B VI calcultaions, an improvement of the in-vessel C/E (Calculated/Experimental) activity ratios for the lower energy threshold detectors, Rh-103 and In-115, is observed. This improvement becomes more evident with increasing neutron penetration depth in the vessel. This is probably attributable to the fact that the inelastic scattering cross section values of the ENDF/B VI Fe-56 data file, approximately in the 0.86 - 1.5 MeV energy range, are lower then the corresponding values of the JEF-2.1 data file.

  19. Qualification and improvement of iron ENDF/B-VI and JEF-2 evaluations by interpretation of the Aspis Benchmark

    International Nuclear Information System (INIS)

    The aim of the present study is to contribute to the validation of the new evaluated nuclear data files like ENDF/B-VI or JEF-2.2. The new cross-section evaluation for iron isotopes are of particular interest for the nuclear community, since it is well known that the ENDF/B-IV data underestimate the neutron flux on deep penetration problems. The performances of the new nuclear data libraries are compared with those of ENDF-B-IV. The ASPIS benchmark, where the neutron transports through more than one meter iron plate, was chosen for this study. The cross-section libraries were produced by the THEMIS/NJOY (ref 1) processing system and the transport calculations were carried out using the 3D Monte-Carlo code TRIPOLI. The influence of different multigroup cross-section representations was investigated. Finally, sensitivity, uncertainty and data adjustment analyses were carried out to obtain some additional informations about the quality of the cross-section data in ENDF/B-VI files. The analyses were performed using the code package set up of different modules, either developed at CEA or obtained from the NEA Data Bank. The adjustment indicated that some modifications have to be introduced to the neutron cross-sections of iron and the whole calculations were repeated with the adjusted set of cross sections. The comparison of the results of the uncertainty and the adjustment analyses applied to ENDF/B-IV and ENDF/B-VI iron data permits to establish the progress made and gives some indications about the state-of-the-art of the cross-section data

  20. On the uptake and binding of uranium (VI) by the green alga Chlorella Vulgaris; Zur Aufnahme und Bindung von Uran(VI) durch die Gruenalge Chlorella Vulgaris

    Energy Technology Data Exchange (ETDEWEB)

    Vogel, Manja

    2011-07-01

    Uranium could be released into the environment from geogenic deposits and from former mining and milling areas by weathering and anthropogenic activities. The elucidation of uranium behavior in geo- and biosphere is necessary for a reliable risk assessment of radionuclide migration in the environment. Algae are widespread in nature and the most important group of organisms in the aquatic habitat. Because of their ubiquitous occurrence in nature the influence of algae on the migration process of uranium in the environment is of fundamental interest e.g. for the development of effective and economical remediation strategies for contaminated waters. Besides, algae are standing at the beginning of the food chain and play an economically relevant role as food and food additive. Therefore the transfer of algae-bound uranium along the food chain could arise to a serious threat to human health. Aim of this work was the quantitative and structural characterization of the interaction between U(VI) and the green alga Chlorella vulgaris in environmental relevant concentration and pH range with special emphasis on metabolic activity. Therefore a defined medium was created which assures the survival/growth of the algae as well as the possibility to predict the uranium speciation. The speciation of uranium in the mineral medium was calculated and experimentally verified by time-resolved laser-induced fluorescence spectroscopy (TRLFS). The results of the sorption experiments showed that both metabolic active and inactive algal cells bind uranium in significant amounts of around 14 mg U/g dry biomass and 28 mg U/g dry biomass, respectively. Another interesting observation was made during the growth of Chlorella cells in mineral medium at the environmental relevant uranium concentration of 5 {mu}M. Under these conditions and during ongoing cultivation a mobilization of the algae-bound uranium occurred. At higher uranium concentrations this effect was not observed due to the die off