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Sample records for californium 252

  1. Historical Review of Californium-252 Discovery and Development

    Science.gov (United States)

    Stoddard, D. H.

    1985-01-01

    This paper discusses the discovery and history of californium 252. This isotope may be synthesized by irradiating plutonium 239, plutonium 242, americium 243, or curium 244 with neutrons in a nuclear reactor. Various experiments and inventions involving Cf conducted at the Savannah River Plant are discussed. The evolution of radiotherapy using californium 252 is reviewed. (PLG)

  2. Production, Distribution, and Applications of Californium-252 Neutron Sources

    Energy Technology Data Exchange (ETDEWEB)

    Balo, P.A.; Knauer, J.B.; Martin, R.C.

    1999-10-03

    The radioisotope {sup 252}Cf is routinely encapsulated into compact, portable, intense neutron sources with a 2.6-year half-life. A source the size of a person's little finger can emit up to 10{sup 11} neutrons/s. Californium-252 is used commercially as a reliable, cost-effective neutron source for prompt gamma neutron activation analysis (PGNAA) of coal, cement, and minerals, as well as for detection and identification of explosives, laud mines, and unexploded military ordnance. Other uses are neutron radiography, nuclear waste assays, reactor start-up sources, calibration standards, and cancer therapy. The inherent safety of source encapsulations is demonstrated by 30 years of experience and by U.S. Bureau of Mines tests of source survivability during explosions. The production and distribution center for the U. S Department of Energy (DOE) Californium Program is the Radiochemical Engineering Development Center (REDC) at Oak Ridge National Laboratory (ORNL). DOE sells The radioisotope {sup 252}Cf is routinely encapsulated into compact, portable, intense neutron sources with a 2.6- year half-life. A source the size of a person's little finger can emit up to 10 neutrons/s. Californium-252 is used commercially as a reliable, cost-effective neutron source for prompt gamma neutron activation analysis (PGNAA) of coal, cement, and minerals, as well as for detection and identification of explosives, laud mines, and unexploded military ordnance. Other uses are neutron radiography, nuclear waste assays, reactor start-up sources, calibration standards, and cancer therapy. The inherent safety of source encapsulations is demonstrated by 30 years of experience and by U.S. Bureau of Mines tests of source survivability during explosions. The production and distribution center for the U. S Department of Energy (DOE) Californium Program is the Radiochemical Engineering Development Center (REDC) at Oak Ridge National Laboratory(ORNL). DOE sells {sup 252}Cf to commercial

  3. Teratogenic effect of Californium-252 irradiation in rats

    Energy Technology Data Exchange (ETDEWEB)

    Satow, Yukio; Lee, Juing-Yi; Hori, Hiroshi; Okuda, Hiroe; Tsuchimoto, Shigeo; Sawada, Shozo; Yokoro, Kenjiro (Hiroshima Univ. (Japan). Research Inst. for Nuclear Medicine and Biology)

    1989-06-01

    The teratogenicity of Californium-252 (Cf-252) irradiation which generates approximately 70% 2.3 MeV fast neutron and 30% gamma rays was evaluated. A single whole body exposure of Cf-252 at various doses was given to pregnant rats on day 8 or 9 of pregnancy, followed by microscopic autopsy of the fetuses at the terminal stage of pregnancy to search for external and internal malformations. For comparison, pregnant rats were irradiated with various doses of Cobalt-60 (Co-60) standard gamma rays at the same dose rate (1 rad/min.). The doses were 20-120 rad of Cf-252 and 80-220 rad of Co-60. Using frequency of radiation induced malformations observed on day 8 of pregnancy as an index, relative biological effectiveness (RBE) of 2.3-2.7 was obtained from the straight line obtained by modifying by the least squares method the frequency curves of malformed fetuses in total implants and in surviving fetuses. The types of malformations induced by Cf-252 and Co-60 irradiation were alike. Using fetal LD/sub 50/ as an index, 2.4 was obtained as RBE when irradiated on day 8 of pregnancy and 3.1 as that when irradiated on day 9. The results showed that Cf-252 had stronger a teratogenic effect than Co-60 gamma rays. (author).

  4. Apparatus for the measurement of total body nitrogen using prompt neutron activation analysis with californium-252.

    Science.gov (United States)

    Mackie, A; Hannan, W J; Smith, M A; Tothill, P

    1988-01-01

    Details of clinical apparatus designed for the measurement of total body nitrogen (as an indicator of body protein), suitable for the critically ill, intensive-care patient are presented. Californium-252 radio-isotopic neutron sources are used, enabling a nitrogen measurement by prompt neutron activation analysis to be made in 40 min with a precision of +/- 3.2% for a whole body dose equivalent of 0.145 mSv. The advantages of Californium-252 over alternative neutron sources are discussed. A comparison between two irradiation/detection geometries is made, leading to an explanation of the geometry adopted for the apparatus. The choice of construction and shielding materials to reduce the count rate at the detectors and consequently to reduce the pile-up contribution to the nitrogen background is discussed. Salient features of the gamma ray spectroscopy system to reduce spectral distortion from pulse pile-up are presented.

  5. Study of the shielding for spontaneous fission sources of Californium-252; Estudio de blindaje para fuentes de fision espontanea de Californio-252

    Energy Technology Data Exchange (ETDEWEB)

    Davila R, I

    1991-06-15

    A shielding study is made to attenuate, until maximum permissible levels, the neutrons radiation and photons emitted by spontaneous fission coming from a source of Californium-252. The compound package by a database (Library DLC-23) and the ANISNW code is used, in it version for personal computer. (Author)

  6. Clinical Report on Californium-252 Neutron Intraluminal Brachytherapy Combined with External Irradiation for Cervical Carcinoma Treatment

    Institute of Scientific and Technical Information of China (English)

    Huanyu Zhao; Keming Wang; Jian Sun; Xin Geng; Weiming Zhang

    2006-01-01

    OBJECTIVE To observe the curative effects and complications of californium-252 (252Cf) neutron intraluminal brachytherapy (IBT) combined with external irradiation (El) for treatment of cervical carcinoma.METHODS From December 2000 to December 2004, 128 cases of cervical carcinoma staged into ⅡA~ⅢB according to the International Federation of Gynecology and Obstetrics (FIGO) standards were treated with 252Cf neutron IBT using 8~10 Gy per fraction, once a week. The total dose at reference A point was 36~40 Gy in 4~5 fractions. From the second day after 252Cf neutron IBT treatment, the whole pelvic cavity was treated with 60Co γ-ray El, applying 2 Gy per fraction, 4 times per week. After 20~25 Gy of El, the center of the whole pelvic field was blocked with 4 cm of lead in width. The total dose of El was 45~50 Gy.RESULTS The short-term therapeutic effects were CR 95.3% and PR 4.7%. The 3 and 5-year local control rates were 93.5% and 87.9%. The overall 3-year survival rate was 87.5% and for Stages Ⅱ and Ⅲ , 90.9%and 81.5% respectively; the overall 5-year survival rate was 70% and for Stages Ⅱ and Ⅲ, 76.2% and 61% respectively. The rate of radiation complications was 4.7% for radiation cystitis, 7.8% for radiation proctitis, 6.3%for vagina contracture and adhesion and 5.5% for protracted radiation proctitis.CONCLUSION An combination of 252Cf neutron IBT with El for treatment of cervical carcinoma can be well-tolerated by cervical carcinoma patients. The rate of local tumor control is high and radiation complications are few.

  7. Application of TSH bioindicator for studying the biological efficiency of neutrons from californium-252 source

    Energy Technology Data Exchange (ETDEWEB)

    Cebulska-Wasilewska, A.; Rekas, K. [Institute of Nuclear Physics, Cracow (Poland); Kim, J.K. [Korea Atomic Energy Research Inst., Taejon (Korea, Republic of)

    1997-12-31

    The effectiveness of neutrons from a Californium-252 source in the induction of various abnormalities in the Tradescantia clone 4430 stamen hair cells (TSH-assay) was studied. The special attention was paid to check whether any enhancement in effects caused by process of boron neutron capture is visible in the cells enriched with boron ions. Two chemicals (borax and BSH) were applied to introduce boron-10 ions into cells. Inflorescence, normal or pretreated with chemicals containing boron, were irradiated in the air with neutrons from a Cf-252 source at KAERI, Taejon, Korea. To estimate the relative biological effectiveness (RBE) in the induction of gene mutations of the neutron beam under the study, Tradescantia inflorescences, without any chemical pretreatment, were irradiated with various doses of X-rays. The ranges of radiation doses used were 0-0.1 Gy in neutrons and 0-0.5 Gy in X-rays. After the time needed to complete the postirradiation repair Tradescantia cuttings were transferred to Cracow, where screening of gene and lethal; mutations, cell cycle alterations in somatic cells have been done, and dose response relationships were figured. The maximal RBE values were estimated in the range of 4.6-6.8. Alterations of RBE value were observed; from 6.8 to 7.8 in the case of plants pretreated with 240 ppm of B-10 from borax, and 4.6 to 6.1 in the case of 400 ppm of B-10 from BSH. Results showed a slight, although statistically insignificant increase in biological efficacy of radiation from the Cf-252 source in samples pretreated with boron containing chemicals. (author)

  8. Long-term effects of an intracavitary treatment with californium-252 on normal tissue. [Swine, /sup 226/Ra

    Energy Technology Data Exchange (ETDEWEB)

    Sullivan, M.F.; Beamer, J.L.; Mahony, T.D.; Cross, F.T.; Lund, J.E.; Endres, G.W.R.

    1976-01-01

    About one hundred fifty swine were exposed to either radium-226 or californium-252 sources in the uterine cervix to determine an RBE for both acute and long-term effects. That value for early changes in the tissues at risk in the treatment of cervical cancer was between 6.2 and 6.8. The incidence of complications increased with time after exposure, especially among animals treated with /sup 252/Cf. Analysis of rectal injury showed that ulceration occurred frequently within a year postexposure at doses between 1600 and 2400 rad calculated at 2 cm lateral to the source midline. Fat necrosis and smooth muscle atrophy, resulting in a local rectal stricture, were delayed changes observed in some animals. The lower ureter was the site for a greater frequency of complications than the GI tract. Ureteral stricture often occurred at doses of 1200 rad from /sup 252/Cf and 7000 rad from /sup 226/Ra. Observation of delayed effects in the uterine-cervix in animals held up to 4 years postexposure indicate that the RBE for /sup 252/Cf may be increased to a value as high as 18, while repair may have even decreased it to about 5.6 in the rectum. Fifty swine are still being observed for long-term effects after doses above 800 rad from /sup 252/Cf and 5000 rad from /sup 226/Ra.

  9. Determination of the optimum-size californium-252 neutron source for borehole capture gamma-ray analysis

    Science.gov (United States)

    Senftle, F.E.; Macy, R.J.; Mikesell, J.L.

    1979-01-01

    The fast- and thermal-neutron fluence rates from a 3.7 ??g 252Cf neutron source in a simulated borehole have been measured as a function of the source-to-detector distance using air, water, coal, iron ore-concrete mix, and dry sand as borehole media. Gamma-ray intensity measurements were made for specific spectral lines at low and high energies for the same range of source-to-detector distances in the iron ore-concrete mix and in coal. Integral gamma-ray counts across the entire spectrum were also made at each source-to-detector distance. From these data, the specific neutron-damage rate, and the critical count-rate criteria, we show that in an iron ore-concrete mix (low hydrogen concentration), 252Cf neutron sources of 2-40 ??g are suitable. The source size required for optimum gamma-ray sensitivity depends on the energy of the gamma ray being measured. In a hydrogeneous medium such as coal, similar measurements were made. The results show that sources from 2 to 20 ??g are suitable to obtain the highest gamma-ray sensitivity, again depending on the energy of the gamma ray being measured. In a hydrogeneous medium, significant improvement in sensitivity can be achieved by using faster electronics; in iron ore, it cannot. ?? 1979 North-Holland Publishing Co.

  10. Design of a homogeneous subcritical nuclear reactor based on thorium with a source of californium 252; Diseno de un reactor nuclear subcritico homogeneo a base de Torio con una fuente de Californio 252

    Energy Technology Data Exchange (ETDEWEB)

    Delgado H, C. E.; Vega C, H. R. [Universidad Autonoma de Zacatecas, Unidad Academica de Estudios Nucleares, Cipres No. 10, Fracc. La Penuela, 98068 Zacatecas, Zac. (Mexico); Sajo B, L., E-mail: ce_delgado89@hotmail.com [Universidad Simon Bolivar, Laboratorio de Fisica Nuclear, Apdo. 89000, 1080A Caracas (Venezuela, Bolivarian Republic of)

    2015-10-15

    Full text: One of the energy alternatives to fossil fuels which do not produce greenhouse gases is the nuclear energy. One of the drawbacks of this alternative is the generation of radioactive wastes of long half-life and its relation to the generation of nuclear materials to produce weapons of mass destruction. An option to these drawbacks of nuclear energy is to use Thorium as part of the nuclear fuel which it becomes in U{sup 233} when capturing neutrons, that is a fissile material. In this paper Monte Carlo methods were used to design a homogeneous subcritical reactor based on thorium. As neutron reflector graphite was used. The reactor core is homogeneous and is formed of 70% light water as moderator, 12% of enriched uranium UO{sub 2}(NO{sub 3}){sub 4} and 18% of thorium Th(NO{sub 3}){sub 4} as fuel. To start the nuclear fission chain reaction an isotopic source of californium 252 was used with an intensity of 4.6 x 10{sup 7} s{sup -1}. In the design the value of the effective multiplication factor, whose value turned out k{sub eff} <1 was calculated. Also, the neutron spectra at different distances from the source and the total fluence were calculated, as well as the values of the ambient dose equivalent in the periphery of the reactor. (Author)

  11. Manganese determination om minerals by activation analysis, using the californium-252 as a neutron source; Determinacao de manganes em minerios, por analise por ativacao, usando californio-252 como fonte de neutrons

    Energy Technology Data Exchange (ETDEWEB)

    Cardoso, Antonio

    1976-07-01

    Neutron Activation Analysis, using a Californium-252 neutron source, has been applied for the determination of manganese in ores such as pyrolusite, rodonite (manganese silicate)' and blending used in dry-batteries The favorable nuclear properties of manganese, such as high thermal neutron cross-section for the reaction {sup 55}Mn (n.gamma){sup 56} Mn, high concentration of manganese in the matrix and short half - life of {sup 56}Mn, are an ideal combination for non-destructive analysis of manganese in ores. Samples and standards of manganese dioxide were irradiated for about 20 minutes, followed by a 4 to 15 minutes decay and counted in a single channel pulse-height discrimination using a NaI(Tl) scintillation detector. Counting time was equal to 10 minutes. The interference of nuclear reactions {sup 56}Fe(n,p){sup 56}Mn and {sup 59} Co (n, {alpha}){sup 56} were studied, as well as problems in connection with neutron shadowing during irradiation, gamma-rays attenuation during counting and influence of granulometry of samples. One sample,was also analysed by wet-chemical method (sodium bismuthate) in order to compare results. As a whole, i t was shown that the analytical method of neutron activation for manganese in ores and blending, is a method simple, rapid and with good precision and accuracy. (author)

  12. Radiological Characterization Technical Report on Californium-252 Sealed Source Transuranic Debris Waste for the Off-Site Source Recovery Project at Los Alamos National Laboratory

    Energy Technology Data Exchange (ETDEWEB)

    Feldman, Alexander [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2014-04-24

    This document describes the development and approach for the radiological characterization of Cf-252 sealed sources for shipment to the Waste Isolation Pilot Plant. The report combines information on the nuclear material content of each individual source (mass or activity and date of manufacture) with information and data on the radionuclide distributions within the originating nuclear material. This approach allows for complete and accurate characterization of the waste container without the need to take additional measurements. The radionuclide uncertainties, developed from acceptable knowledge (AK) information regarding the source material, are applied to the summed activities in the drum. The AK information used in the characterization of Cf-252 sealed sources has been qualified by the peer review process, which has been reviewed and accepted by the Environmental Protection Agency.

  13. Californium Electrodepositions at Oak Ridge National Laboratory

    Energy Technology Data Exchange (ETDEWEB)

    Boll, Rose Ann [ORNL

    2015-01-01

    Electrodepositions of californium isotopes were successfully performed at Oak Ridge National Laboratory (ORNL) during the past year involving two different types of deposition solutions, ammonium acetate (NH4C2H3O2) and isobutanol ((CH3)2CHCH2OH). A californium product that was decay enriched in 251Cf was recovered for use in super-heavy element (SHE) research. This neutron-rich isotope, 251Cf, provides target material for SHE research for the potential discovery of heavier isotopes of Z=118. The californium material was recovered from aged 252Cf neutron sources in storage at ORNL. These sources have decayed for over 30 years, thus providing material with a very high 251Cf-to-252Cf ratio. After the source capsules were opened, the californium was purified and then electrodeposited using the isobutanol method onto thin titanium foils for use in an accelerator at the Joint Institute for Nuclear Research in Dubna, Russia. Another deposition method, ammonium acetate, was used to produce a deposition containing 1.7 0.1 Ci of 252Cf onto a stainless steel substrate. This was the largest single electrodeposition of 252Cf ever prepared. The 252Cf material was initially purified using traditional ion exchange media, such as AG50-AHIB and AG50-HCl, and further purified using a TEVA-NH4SCN system to remove any lanthanides, resulting in the recovery of 3.6 0.1 mg of purified 252Cf. The ammonium acetate deposition was run with a current of 1.0 amp, resulting in a 91.5% deposition yield. Purification and handling of the highly radioactive californium material created additional challenges in the production of these sources.

  14. Keno-Nr a Monte Carlo Code Simulating the Californium -252-SOURCE-DRIVEN Noise Analysis Experimental Method for Determining Subcriticality

    Science.gov (United States)

    Ficaro, Edward Patrick

    The ^{252}Cf -source-driven noise analysis (CSDNA) requires the measurement of the cross power spectral density (CPSD) G_ {23}(omega), between a pair of neutron detectors (subscripts 2 and 3) located in or near the fissile assembly, and the CPSDs, G_{12}( omega) and G_{13}( omega), between the neutron detectors and an ionization chamber 1 containing ^{252}Cf also located in or near the fissile assembly. The key advantage of this method is that the subcriticality of the assembly can be obtained from the ratio of spectral densities,{G _sp{12}{*}(omega)G_ {13}(omega)over G_{11 }(omega)G_{23}(omega) },using a point kinetic model formulation which is independent of the detector's properties and a reference measurement. The multigroup, Monte Carlo code, KENO-NR, was developed to eliminate the dependence of the measurement on the point kinetic formulation. This code utilizes time dependent, analog neutron tracking to simulate the experimental method, in addition to the underlying nuclear physics, as closely as possible. From a direct comparison of simulated and measured data, the calculational model and cross sections are validated for the calculation, and KENO-NR can then be rerun to provide a distributed source k_ {eff} calculation. Depending on the fissile assembly, a few hours to a couple of days of computation time are needed for a typical simulation executed on a desktop workstation. In this work, KENO-NR demonstrated the ability to accurately estimate the measured ratio of spectral densities from experiments using capture detectors performed on uranium metal cylinders, a cylindrical tank filled with aqueous uranyl nitrate, and arrays of safe storage bottles filled with uranyl nitrate. Good agreement was also seen between simulated and measured values of the prompt neutron decay constant from the fitted CPSDs. Poor agreement was seen between simulated and measured results using composite ^6Li-glass-plastic scintillators at large subcriticalities for the tank of

  15. Paired observation of californium-252 neutron intraluminal brachytherapy combined with external-beam radiotherapy with and without lead shielding for cervical cancer%252 Cf中子腔内照射结合挡铅与不挡铅外照射治疗宫颈癌的配对观察

    Institute of Scientific and Technical Information of China (English)

    戴卓捷; 雷新; 陈永红; 刘佳

    2015-01-01

    目的:比较252 Cf中子腔内照射结合挡铅盆腔对穿野和不挡铅箱式四野外照射治疗宫颈癌的治疗结果。方法2004—2007年本院收治的Ⅱa—Ⅲb 期的宫颈鳞癌患者,按照临床分期、年龄、肿瘤大小、贫血程度为配对条件,共筛选出26对(52例)研究对象,分为挡铅盆腔对穿野组(挡铅组)和不挡铅箱式四野组(不挡铅组)。两组患者外照射期间穿插252 Cf中子后装治疗。 Kaplan?Meier法计算5年LC、OS、DFS 并 Logrank 检验差异,晚期并发症发生率差异行 McNemar 法检验。结果挡铅、不挡铅组5年LC 率分别为85%、81%(P=0??014),OS 率分别为89%、73%(P=0??013),DFS 率分别为89%、73%(P=0??013),晚期并发症发生率分别为12%、23%(P=0??008)。结论腔内照射结合外照射治疗宫颈癌时无论采取对穿野还是箱式四野,后程前后野中央均应挡铅。%Objective To compare the efficacy between californium?252 ( 252 Cf ) neutron intraluminal brachytherapy combined with external?beam radiotherapy with lead?shielding pelvic parallel opposing field technique and non?lead?shielding four?field box technique for cervical cancer. Methods A total of 52 patients with stage Ⅱa?Ⅲb cervical squamous cell carcinoma who were admitted to our hospital from 2004 to 2007 were enrolled as subjects and paired by clinical stage, age, tumor size, and degree of anemia. The 26 pairs of patients were divided into lead?shielding pelvic parallel opposing field group (lead?shielding group) and non?lead?shielding four?field box group (non?lead?shielding group). For all patients in both groups, 252 Cf neutron brachytherapy was added in external?beam radiotherapy. The local control (LC), overall survival (OS), and disease?free survival (DFS) rates were calculated using the Kaplan?Meier method and analyzed using the log?rank test. The difference in the incidence of late complications was

  16. Californium Recovery from Palladium Wire

    Energy Technology Data Exchange (ETDEWEB)

    Burns, Jon D. [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

    2014-08-01

    The recovery of 252Cf from palladium-252Cf cermet wires was investigated to determine the feasibility of implementing it into the cermet wire production operation at Oak Ridge National Laboratory’s Radiochemical Engineering Development Center. The dissolution of Pd wire in 8 M HNO3 and trace amounts of HCl was studied at both ambient and elevated temperatures. These studies showed that it took days to dissolve the wire at ambient temperature and only 2 hours at 60°C. Adjusting the ratio of the volume of solvent to the mass of the wire segment showed little change in the kinetics of dissolution, which ranged from 0.176 mL/mg down to 0.019 mL/mg. A successful chromatographic separation of 153Gd, a surrogate for 252Cf, from Pd was demonstrated using AG 50x8 cation exchange resin with a bed volume of 0.5 mL and an internal diameter of 0.8 cm.

  17. Spontaneous Partitioning of Californium from Curium: Curious Cases from the Crystallization of Curium Coordination Complexes

    Energy Technology Data Exchange (ETDEWEB)

    Cary, Samantha K.; Silver, Mark A.; Liu, Guokui; Wang, Jamie C.; Bogart, Justin A.; Stritzinger, Jared T.; Arico, Alexandra A.; Hanson, Kenneth; Schelter, Eric J.; Albrecht-Schmitt, Thomas E.

    2015-12-07

    The reaction of 248CmCl3 with excess 2,6-pyridinedicarboxylic acid (DPA) under mild solvothermal conditions results in crystallization of the tris-chelate complex Cm(HDPA)3·H2O. Approximately half of the curium remains in solution at the end of this process, and evaporation of the mother liquor results in crystallization of the bis-chelate complex [Cm(HDPA)- (H2DPA)(H2O)2Cl]Cl·2H2O. 248Cm is the daughter of the α decay of 252Cf and is extracted in high purity from this parent. However, trace amounts of 249,250,251Cf are still present in all samples of 248Cm. During the crystallization of Cm(HDPA)3·H2O and [Cm(HDPA)(H2DPA)(H2O)2Cl]Cl·2H2O, californium(III) spontaneously separates itself from the curium complexes and is found doped within crystals of DPA in the form of Cf(HDPA)3. These results add to the growing body of evidence that the chemistry of californium is fundamentally different from that of earlier actinides.

  18. Design and Potentials of the Californium-252 Radiation Facility at WES

    Science.gov (United States)

    1975-09-01

    standards, using an Image Quality Indicator (IQI) and also a Beam Purity Indicator (BPI),** shows a relatively good thermal and epithermal neutron ...colli-nated beam of the desired neutron radiation. Consideration of the basic nuclear properties was therefore a necessity in achieving the desired...The upper 6 ft has been designed for use in radiography and neutron counting. The steel tank was prefabricated in two sections. The lower 6-ft

  19. An ECR Charge Breeder for the 252 Cf Fission Source Project (CARIBU) at ATLAS%ATLAS用于CARIBU项目的ECR离子剥离器

    Institute of Scientific and Technical Information of China (English)

    R.C.Pardo; R.Vondrasek; T.Kulevoy; V.Aseev; R.Scott; P.Suominen

    2007-01-01

    A new radioactive beam facility for ATLAS,the Californium Rare Ion Breeder Upgrade(CARIBU),is under construction.The facility will use fission fragments from a 1 Ci 252 Cf source;thermalized and collected into a low-energy beam by a helium gas catcher.In order to reaccelerate these beams.the existing ATLAS ECR-I ion source is being redesigned to function as a charge breeder source.The design and features of this charge breeder configuration is discussed and the project status described.

  20. Test and evaluation results of the /sup 252/Cf shuffler at the Savannah River Plant

    Energy Technology Data Exchange (ETDEWEB)

    Crane, T.W.

    1981-03-01

    The /sup 252/Cf Shuffler, a nondestructive assay instrument employing californium neutron source irradiation and delayed-neutron counting, was developed for measuring /sup 235/U content of scrap and waste items generated at the Savannah River Plant (SRP) reactor fuel fabrication facility. The scrap and waste items include high-purity uranium-aluminum alloy ingots as well as pieces of castings, saw and lathe chips from machining operations, low-purity items such as oxides of uranium or uranium intermixed with flux materials found in recovery operations, and materials not recoverable at SRP such as floor sweepings or residues from the uranium scrap recovery operation. The uranium contains about 60% /sup 235/U with the remaining isotopes being /sup 236/U, /sup 238/U, and /sup 234/U in descending order. The test and evaluation at SRP concluded that the accuracy, safety, reliability, and ease of use made the /sup 252/Cf Shuffler a suitable instrument for routine use in an industrial, production-oriented plant.

  1. 42 CFR 422.252 - Terminology.

    Science.gov (United States)

    2010-10-01

    ... 42 Public Health 3 2010-10-01 2010-10-01 false Terminology. 422.252 Section 422.252 Public Health CENTERS FOR MEDICARE & MEDICAID SERVICES, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICARE... § 422.252 Terminology. Annual MA capitation rate means a county payment rate for an MA local...

  2. Dicty_cDB: SFD252 [Dicty_cDB

    Lifescience Database Archive (English)

    Full Text Available SF (Link to library) SFD252 (Link to dictyBase) - - - Contig-U16471-1 SFD252Z (Link... to Original site) - - SFD252Z 694 - - - - Show SFD252 Library SF (Link to library) Clone ID SFD252 (Link to...ycdb.biol.tsukuba.ac.jp/CSM/SF/SFD2-C/SFD252Q.Seq.d/ Representative seq. ID SFD25...2Z (Link to Original site) Representative DNA sequence >SFD252 (SFD252Q) /CSM/SF/SFD2-C/SFD252Q.Seq.d/ XXXXX...EQLKVIKEFQRQDQQKKQKIQQENDAVYLSDVEKAQLELDAELAKNNKQENQDENLVQEK QQSPDQIKNQLKNIQHEQQIQEQQDKLNQEKNQQLLEQEQNQK*fnhsf

  3. Dicty_cDB: SSC252 [Dicty_cDB

    Lifescience Database Archive (English)

    Full Text Available SS (Link to library) SSC252 (Link to dictyBase) - - - Contig-U16560-1 SSC252Z (Link... to Original site) - - SSC252Z 516 - - - - Show SSC252 Library SS (Link to library) Clone ID SSC252 (Link to...ycdb.biol.tsukuba.ac.jp/CSM/SS/SSC2-C/SSC252Q.Seq.d/ Representative seq. ID SSC25...2Z (Link to Original site) Representative DNA sequence >SSC252 (SSC252Q) /CSM/SS/SSC2-C/SSC252Q.Seq.d/ XXXXX...5-B/SSE525Q.Seq.d/ 898 0.0 SSC252 (SSC252Q) /CSM/SS/SSC2-C/SSC252Q.Seq.d/ 898 0.0 SSC150 (SSC150Q) /CSM/SS/SSC1-C/SSC

  4. 48 CFR 53.301-252 - Standard Form 252, Architect-Engineer Contract.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 2 2010-10-01 2010-10-01 false Standard Form 252, Architect-Engineer Contract. 53.301-252 Section 53.301-252 Federal Acquisition Regulations System FEDERAL..., Architect-Engineer Contract. EC01MY91.035 EC01MY91.036...

  5. 7 CFR 252.2 - Definitions.

    Science.gov (United States)

    2010-01-01

    ... authorities, schools, service institutions, welfare agencies, nutrition programs for the elderly... 7 Agriculture 4 2010-01-01 2010-01-01 false Definitions. 252.2 Section 252.2 Agriculture Regulations of the Department of Agriculture (Continued) FOOD AND NUTRITION SERVICE, DEPARTMENT OF...

  6. 40 CFR 265.252 - Waste analysis.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 25 2010-07-01 2010-07-01 false Waste analysis. 265.252 Section 265... FACILITIES Waste Piles § 265.252 Waste analysis. In addition to the waste analyses required by § 265.13, the... in the pile to which it is to be added. The analysis conducted must be capable of...

  7. 24 CFR 221.252 - Substitute mortgagors.

    Science.gov (United States)

    2010-04-01

    ... Cost Homes § 221.252 Substitute mortgagors. (a) Selling mortgagor. The mortgagee may effect the release... 24 Housing and Urban Development 2 2010-04-01 2010-04-01 false Substitute mortgagors. 221.252... approval of a substitute mortgagor, as provided by this section. (b) Purchasing mortgagor. The...

  8. 48 CFR 252.239-7002 - Access.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Access. 252.239-7002... Clauses 252.239-7002 Access. As prescribed in 239.7411(a), use the following clause: Access (DEC 1991) (a) Subject to military security regulations, the Government shall permit the Contractor access at...

  9. 48 CFR 252.217-7010 - Performance.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Performance. 252.217-7010... Clauses 252.217-7010 Performance. As prescribed in 217.7104(a), use the following clause: Performance (JUL..., scrap or other ship's material of the Government resulting from performance of the work as items...

  10. 7 CFR 252.3 - Administration.

    Science.gov (United States)

    2010-01-01

    ... 7 Agriculture 4 2010-01-01 2010-01-01 false Administration. 252.3 Section 252.3 Agriculture Regulations of the Department of Agriculture (Continued) FOOD AND NUTRITION SERVICE, DEPARTMENT OF AGRICULTURE... Administration. (a) Role of FNS. The Secretary will designate those commodities which will be available under...

  11. Dicty_cDB: SLI252 [Dicty_cDB

    Lifescience Database Archive (English)

    Full Text Available SL (Link to library) SLI252 (Link to dictyBase) sli252 - - Contig-U11535-1 SLI252Z ...(Link to Original site) - - SLI252Z 600 - - - - Show SLI252 Library SL (Link to library) Clone ID SLI252 (Li...nk to dictyBase) Atlas ID sli252 NBRP ID - dictyBase ID - Link to Contig Contig-U11535-1 Original site URL h...ttp://dictycdb.biol.tsukuba.ac.jp/CSM/SL/SLI2-C/SLI252Q.Seq.d/ Representative seq. ID SLI2...52Z (Link to Original site) Representative DNA sequence >SLI252 (SLI252Q) /CSM/SL/SLI2-C/SLI252Q.Se

  12. Dicty_cDB: SSG252 [Dicty_cDB

    Lifescience Database Archive (English)

    Full Text Available SS (Link to library) SSG252 (Link to dictyBase) - - - Contig-U01680-1 | Contig-U01743-1 SSG...252P (Link to Original site) SSG252F 642 SSG252Z 164 SSG252P 806 - - Show SSG252 Library SS (Link to library) Clone ID SSG...80-1 | Contig-U01743-1 Original site URL http://dictycdb.biol.tsukuba.ac.jp/CSM/SS/SSG2-C/SSG...252Q.Seq.d/ Representative seq. ID SSG252P (Link to Original site) Representative DNA sequence >SSG252 (SSG...252Q) /CSM/SS/SSG2-C/SSG252Q.Seq.d/ AAAAAATTAATAATAGTTCTTAAATAGTTTTTAAAATATTAATACAAATATTAAATAAAT

  13. 14 CFR 252.8 - Extent of smoking restrictions.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 4 2010-01-01 2010-01-01 false Extent of smoking restrictions. 252.8... PROCEEDINGS) ECONOMIC REGULATIONS SMOKING ABOARD AIRCRAFT § 252.8 Extent of smoking restrictions. The restrictions on smoking described in §§ 252.3 through 252.7 shall apply to all locations within the aircraft....

  14. Design of a californium-based epithermal neutron beam for neutron capture therapy.

    Science.gov (United States)

    Yanch, J C; Kim, J K; Wilson, M J

    1993-08-01

    The potential of the spontaneously fissioning isotope, 252Cf, to provide epithermal neutrons for use in boron neutron capture therapy (BNCT) has been investigated using Monte Carlo simulation. The Monte Carlo code MCNP was used to design an assembly composed of a 26 cm long, 11 cm radius cylindrical D2O moderator followed by a 64 cm long Al filter. Lithium filters are placed between the moderator and the filter and between the Al and the patient. A reflector surrounding the moderator/filter assembly is required in order to maintain adequate therapy flux at the patient position. An ellipsoidal phantom composed of skull- and brain-equivalent material was used to determine the dosimetric effect of this beam. It was found that both advantage depths and advantage ratios compare very favourably with reactor and accelerator epithermal neutron sources. The dose rate obtainable, on the other hand, is 4.1 RBE cGy min-1, based on a very large (1.0 g) source of 252Cf. This dose rate is two to five times lower than those provided by existing reactor beams and can be viewed as a drawback of using 252Cf as a neutron source. Radioisotope sources, however, do offer the advantage of in-hospital installation.

  15. 27 CFR 25.252 - Records.

    Science.gov (United States)

    2010-04-01

    ... TREASURY LIQUORS BEER Removal of Brewer's Yeast and Other Articles § 25.252 Records. (a) Production. The brewer shall keep records of the production of malt syrup, wort, and other articles which are removed... of brewer's yeast, malt and other articles from the brewery. The record shall include the...

  16. 40 CFR 61.252 - Standard.

    Science.gov (United States)

    2010-07-01

    ... EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS National Emission Standards for Radon Emissions From Operating Mill Tailings § 61.252 Standard. (a) Radon-222 emissions to the ambient air from an existing uranium mill tailings pile shall not exceed 20 pCi/(m2-sec) (1.9 pCi/(ft2-sec)) of radon-222. (b)...

  17. 48 CFR 252.217-7004 - Job orders and compensation.

    Science.gov (United States)

    2010-10-01

    ... compensation. 252.217-7004 Section 252.217-7004 Federal Acquisition Regulations System DEFENSE ACQUISITION... of Provisions And Clauses 252.217-7004 Job orders and compensation. As prescribed in 217.7104(a), use the following clause: JOB ORDERS AND COMPENSATION (MAY 2006) (a) The Contracting Officer shall...

  18. 48 CFR 252.246-7002 - Warranty of construction (Germany).

    Science.gov (United States)

    2010-10-01

    ... (Germany). 252.246-7002 Section 252.246-7002 Federal Acquisition Regulations System DEFENSE ACQUISITION... of Provisions And Clauses 252.246-7002 Warranty of construction (Germany). As prescribed in 246.710(4), use the following clause: Warranty of Construction (Germany) (JUN 1997) (a) In addition to any...

  19. 48 CFR 252.231-7000 - Supplemental cost principles.

    Science.gov (United States)

    2010-10-01

    ... principles. 252.231-7000 Section 252.231-7000 Federal Acquisition Regulations System DEFENSE ACQUISITION... of Provisions And Clauses 252.231-7000 Supplemental cost principles. As prescribed in 231.100-70, use the following clause: Supplemental Cost Principles (DEC 1991) When the allowability of costs...

  20. 14 CFR 252.7 - No-smoking sections.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 4 2010-01-01 2010-01-01 false No-smoking sections. 252.7 Section 252.7... REGULATIONS SMOKING ABOARD AIRCRAFT § 252.7 No-smoking sections. (a) Except as provided in paragraph (b) of... shall provide, at a minimum: (1) A no-smoking section for each class of service; (2) A sufficient...

  1. 46 CFR 252.33 - Hull and machinery insurance.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 8 2010-10-01 2010-10-01 false Hull and machinery insurance. 252.33 Section 252.33... Subsidy Rates § 252.33 Hull and machinery insurance. (a) Subsidy items. The fair and reasonable net premium costs (including stamp taxes) of hull and machinery, increased value, excess general...

  2. Dicty_cDB: AFI252 [Dicty_cDB

    Lifescience Database Archive (English)

    Full Text Available AF (Link to library) AFI252 (Link to dictyBase) - - - Contig-U13401-1 AFI252F (Link... to Original site) AFI252F 545 - - - - - - Show AFI252 Library AF (Link to library) Clone ID AFI252 (Link to dict...yBase) Atlas ID - NBRP ID - dictyBase ID - Link to Contig Contig-U13401-1 Original site URL http://dict...ted Amino Acid sequence kxyn*KRFKXKEGSDYINANYIDGAYPKQFICTQGPLPNTIADFWRMVWENRCRIIVMLS RESENCRIKCDRYWPEQIGGEQF...*hprshstipsvxt*yhksxksnhtiir*kcsnhxxlxxxxx x--- Frame B: kxyn*KRFKXKEGSDYINANYIDGAYPKQFICTQGPLPNTIADFWRMVWEN

  3. Graphite moderated {sup 252}Cf source

    Energy Technology Data Exchange (ETDEWEB)

    Sajo B, L.; Barros, H.; Greaves, E. D. [Universidad Simon Bolivar, Nuclear Physics Laboratory, Apdo. 89000, 1080A Caracas (Venezuela, Bolivarian Republic of); Vega C, H. R., E-mail: fermineutron@yahoo.com [Universidad Autonoma de Zacatecas, Unidad Academica de Estudios Nucleares, Cipres No. 10, Fracc. La Penuela, 98068 Zacatecas (Mexico)

    2014-08-15

    The thorium molten salt reactor is an attractive and affordable nuclear power option for developing countries with insufficient infrastructure and limited technological capability. In the aim of personnel training and experience gathering at the Universidad Simon Bolivar there is in progress a project of developing a subcritical thorium liquid fuel reactor. The neutron source to run this subcritical reactor is a {sup 252}Cf source and the reactor will use high-purity graphite as moderator. Using the MCNP5 code the neutron spectra of the {sup 252}Cf in the center of the graphite moderator has been estimated along the channel where the liquid thorium salt will be inserted; also the ambient dose equivalent due to the source has been determined around the moderator. (Author)

  4. Time Series Analysis For The Californium Source In Sudbury Neutrino Observatory

    CERN Document Server

    Labranche, H

    2004-01-01

    The Sudbury Neutrino Observatory uses a 252Cf source to measure the neutron detection efficiency of its detector. We propose a method, the Time Series Analysis, that uses pairs of time intervals between the detected events to find the neutron detection efficiency, the probability to detect from a fission the prompt γ-rays, the neutron mean life inside the detector, the source fission rate and the residual activity rate from non-fission events. We explain our theoretical model of the source and the procedure to fit the data. With a 2.5 MeV threshold cut on the data, the neutron mean life is 5.281 ± 0.004(stat) msec and the source fission rate at June 12, 2001 is 4.360 ± 0.004(stat) sec −1. At this moment, the Time Series can only be applied to data when the source is near the centre. The technique is also applied with an AmBe source. We also show the latest progress to improve the technique. Finally, we briefly show another method, the Multiplicity Analysis, which was ...

  5. 46 CFR 252.23 - Financial and other reporting requirements.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 8 2010-10-01 2010-10-01 false Financial and other reporting requirements. 252.23... SERVICES Operation § 252.23 Financial and other reporting requirements. (a) Voyage report. The operator... total loss covered by a policy of insurance. (d) Financial statements. The operator shall submit,...

  6. 7 CFR 765.252 - Lease of security.

    Science.gov (United States)

    2010-01-01

    ... 7 Agriculture 7 2010-01-01 2010-01-01 false Lease of security. 765.252 Section 765.252 Agriculture... Lease of security. (a) Real estate leases. The borrower may lease real estate security provided the... leases does not exceed 3 years, or 5 years if the borrower and the lessee are related by blood...

  7. 48 CFR 252.237-7017 - Individual laundry.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Individual laundry. 252... Provisions And Clauses 252.237-7017 Individual laundry. As prescribed in 237.7101(f), use the following clause: Individual Laundry (DEC 1991) (a) The Contractor shall provide laundry service under...

  8. 48 CFR 252.236-7005 - Airfield safety precautions.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Airfield safety precautions. 252.236-7005 Section 252.236-7005 Federal Acquisition Regulations System DEFENSE ACQUISITION... to contract performance might result in vertical projections at or above the...

  9. 48 CFR 252.228-7001 - Ground and flight risk.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Ground and flight risk. 252.228-7001 Section 252.228-7001 Federal Acquisition Regulations System DEFENSE ACQUISITION...) Conventional winged aircraft, as well as helicopters, vertical take-off or landing aircraft,...

  10. 48 CFR 252.217-7015 - Safety and health.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Safety and health. 252.217... Clauses 252.217-7015 Safety and health. As prescribed in 217.7104(a), use the following clause: Safety and Health (DEC 1991) Nothing contained in the Master Agreement or any job order shall relieve the...

  11. Dicty_cDB: VSJ252 [Dicty_cDB

    Lifescience Database Archive (English)

    Full Text Available S/VSJ2-C/VSJ252Q.Seq.d/ Representative seq. ID VSJ252F (Link to Original site) Representative...as ID - NBRP ID - dictyBase ID - Link to Contig - Original site URL http://dictycdb.biol.tsukuba.ac.jp/CSM/V

  12. 48 CFR 252.232-7000 - Advance payment pool.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Advance payment pool. 252... Provisions And Clauses 252.232-7000 Advance payment pool. As prescribed in 232.412-70(a), use the following clause: Advance Payment Pool (DEC 1991) (a) Notwithstanding any other provision of this contract,...

  13. 48 CFR 252.227-7004 - License grant.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false License grant. 252.227... Clauses 252.227-7004 License grant. As prescribed at 227.7009-3(a), insert the following clause in patent releases, license agreements, and assignments: License Grant (AUG 1984) (a) The Contractor hereby grants...

  14. 48 CFR 252.227-7005 - License term.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false License term. 252.227-7005... Clauses 252.227-7005 License term. As prescribed at 227.7009-3(b), insert one of the following clauses in patent releases, license agreements, and assignments: License Term (OCT 2001) Alternate I (AUG 1984)....

  15. 48 CFR 252.235-7002 - Animal welfare.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Animal welfare. 252.235... Clauses 252.235-7002 Animal welfare. As prescribed in 235.072(a), use the following clause: Animal Welfare... contractors with approved Public Health Service Welfare Assurances. (e) The Contractor may...

  16. 14 CFR 252.3 - Smoking ban: air carriers.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 4 2010-01-01 2010-01-01 false Smoking ban: air carriers. 252.3 Section... PROCEEDINGS) ECONOMIC REGULATIONS SMOKING ABOARD AIRCRAFT § 252.3 Smoking ban: air carriers. Air carriers shall prohibit smoking on all scheduled passenger flights....

  17. 14 CFR 252.5 - Smoking ban: foreign air carriers.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 4 2010-01-01 2010-01-01 false Smoking ban: foreign air carriers. 252.5... PROCEEDINGS) ECONOMIC REGULATIONS SMOKING ABOARD AIRCRAFT § 252.5 Smoking ban: foreign air carriers. (a) Foreign air carriers shall prohibit smoking on all scheduled passenger flight segments: (1) Between...

  18. 48 CFR 252.239-7008 - Reuse arrangements.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Reuse arrangements. 252... Provisions And Clauses 252.239-7008 Reuse arrangements. As prescribed in 239.7411(a), use the following clause: Reuse Arrangements (DEC 1991) (a) When feasible, the Contractor shall reuse canceled...

  19. 18 CFR 2.52 - Suspension of rate schedules.

    Science.gov (United States)

    2010-04-01

    ... 18 Conservation of Power and Water Resources 1 2010-04-01 2010-04-01 false Suspension of rate schedules. 2.52 Section 2.52 Conservation of Power and Water Resources FEDERAL ENERGY REGULATORY COMMISSION, DEPARTMENT OF ENERGY GENERAL RULES GENERAL POLICY AND INTERPRETATIONS Statements of General Policy...

  20. Development of electron beam ion source charge breeder for rare isotopes at Californium Rare Isotope Breeder Upgrade

    Energy Technology Data Exchange (ETDEWEB)

    Kondrashev, S.; Dickerson, C.; Levand, A.; Ostroumov, P. N.; Pardo, R. C.; Savard, G.; Vondrasek, R. [Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States); Alessi, J.; Beebe, E.; Pikin, A. [Collider-Accelerator Department, Brookhaven National Laboratory, Upton, New York 11973 (United States); Kuznetsov, G. I.; Batazova, M. A. [Budker Institute of Nuclear Physics, Novosibirsk 630090 (Russian Federation)

    2012-02-15

    Recently, the Californium Rare Isotope Breeder Upgrade (CARIBU) to the Argonne Tandem Linac Accelerator System (ATLAS) was commissioned and became available for production of rare isotopes. Currently, an electron cyclotron resonance ion source is used as a charge breeder for CARIBU beams. To further increase the intensity and improve the purity of neutron-rich ion beams accelerated by ATLAS, we are developing a high-efficiency charge breeder for CARIBU based on an electron beam ion source (EBIS). The CARIBU EBIS charge breeder will utilize the state-of-the-art EBIS technology recently developed at Brookhaven National Laboratory (BNL). The electron beam current density in the CARIBU EBIS trap will be significantly higher than that in existing operational charge-state breeders based on the EBIS concept. The design of the CARIBU EBIS charge breeder is nearly complete. Long-lead components of the EBIS such as a 6-T superconducting solenoid and an electron gun have been ordered with the delivery schedule in the fall of 2011. Measurements of expected breeding efficiency using the BNL Test EBIS have been performed using a Cs{sup +} surface ionization ion source for external injection in pulsed mode. In these experiments we have achieved {approx}70% injection/extraction efficiency and breeding efficiency into the most abundant charge state of {approx}17%.

  1. Development of electron beam ion source charge breeder for rare isotopes at Californium Rare Isotope Breeder Upgrade

    Energy Technology Data Exchange (ETDEWEB)

    Kondrashev S.; Alessi J.; Dickerson, C.; Levand, A.; Ostroumov, P.N.; Pardo, R.C.; Savard, G.; Vondrasek, R.; Beebe, E.; Pikin, A.; Kuznetsov, G.I.; Batazova, M.A.

    2012-02-03

    Recently, the Californium Rare Isotope Breeder Upgrade (CARIBU) to the Argonne Tandem Linac Accelerator System (ATLAS) was commissioned and became available for production of rare isotopes. Currently, an electron cyclotron resonance ion source is used as a charge breeder for CARIBU beams. To further increase the intensity and improve the purity of neutron-rich ion beams accelerated by ATLAS, we are developing a high-efficiency charge breeder for CARIBU based on an electron beam ion source (EBIS). The CARIBU EBIS charge breeder will utilize the state-of-the-art EBIS technology recently developed at Brookhaven National Laboratory (BNL). The electron beam current density in the CARIBU EBIS trap will be significantly higher than that in existing operational charge-state breeders based on the EBIS concept. The design of the CARIBU EBIS charge breeder is nearly complete. Long-lead components of the EBIS such as a 6-T superconducting solenoid and an electron gun have been ordered with the delivery schedule in the fall of 2011. Measurements of expected breeding efficiency using the BNL Test EBIS have been performed using a Cs{sup +} surface ionization ion source for external injection in pulsed mode. In these experiments we have achieved {approx}70% injection/extraction efficiency and breeding efficiency into the most abundant charge state of {approx}17%.

  2. 50 CFR 216.252 - Permissible methods of taking.

    Science.gov (United States)

    2010-10-01

    ... ADMINISTRATION, DEPARTMENT OF COMMERCE MARINE MAMMALS REGULATIONS GOVERNING THE TAKING AND IMPORTING OF MARINE... Mexico § 216.252 Permissible methods of taking. (a) Under Letters of Authorization issued pursuant...

  3. 48 CFR 252.229-7002 - Customs exemptions (Germany).

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Customs exemptions... of Provisions And Clauses 252.229-7002 Customs exemptions (Germany). As prescribed in 229.402-70(b), use the following clause: Customs Exemptions (Germany) (JUN 1997) Imported products required for...

  4. 48 CFR 252.247-7025 - Reflagging or repair work.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Reflagging or repair work... of Provisions And Clauses 252.247-7025 Reflagging or repair work. As prescribed in 247.574(d), use the following clause: Reflagging or Repair Work (JUN 2005) (a) Definition. Reflagging or repair...

  5. 38 CFR 21.252 - Job development and placement services.

    Science.gov (United States)

    2010-07-01

    ... AFFAIRS (CONTINUED) VOCATIONAL REHABILITATION AND EDUCATION Vocational Rehabilitation and Employment Under 38 U.S.C. Chapter 31 Employment Services § 21.252 Job development and placement services. (a) General... Employment Services and the Veterans' Employment and Training Service of the United States Department...

  6. 48 CFR 252.225-7041 - Correspondence in English.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Correspondence in English... of Provisions And Clauses 252.225-7041 Correspondence in English. As prescribed in 225.1103(2), use the following clause: Correspondence in English (JUN 1997) The Contractor shall ensure that...

  7. 40 CFR 264.252 - Action leakage rate.

    Science.gov (United States)

    2010-07-01

    ... 264.252 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) SOLID WASTES (CONTINUED) STANDARDS FOR OWNERS AND OPERATORS OF HAZARDOUS WASTE TREATMENT, STORAGE, AND DISPOSAL FACILITIES Waste... for waste pile units subject to § 264.251(c) or (d). The action leakage rate is the maximum...

  8. 48 CFR 252.234-7002 - Earned Value Management System.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Earned Value Management... of Provisions And Clauses 252.234-7002 Earned Value Management System. As prescribed in 234.203(2), use the following clause: Earned Value Management System (APR 2008) (a) In the performance of...

  9. 48 CFR 252.229-7003 - Tax Exemptions (Italy).

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Tax Exemptions (Italy... of Provisions And Clauses 252.229-7003 Tax Exemptions (Italy). As prescribed in 229.402-70(c), use the following clause: Tax Exemptions (Italy) (JAN 2002) (a) The Contractor represents that...

  10. EMISSION OF PHOTONS IN SPONTANEOUS FISSION OF CF-252

    NARCIS (Netherlands)

    VANDERPLOEG, H; BACELAR, JCS; BUDA, A; LAURENS, CR; VANDERWOUDE, A; GAARDHOJE, JJ; ZELAZNY, Z; VANTHOF, G; KALANTARNAYESTANAKI, N

    1995-01-01

    High energy photon emission accompanying the spontaneous fission of Cf-252 is measured for different mass splits. The photon yields up to an energy of 20 MeV are obtained at several angles relative to the fission direction. Statistical model calculations are used to interpret the data. The photon yi

  11. 30 CFR 252.4 - Summary Report to affected States.

    Science.gov (United States)

    2010-07-01

    ... CONTINENTAL SHELF (OCS) OIL AND GAS INFORMATION PROGRAM § 252.4 Summary Report to affected States. (a) The Director, as soon as practicable after analysis, interpretation, and compilation of oil and gas data and... the onshore impacts of potential OCS oil and gas development and production. The Director...

  12. 48 CFR 252.229-7008 - Relief from import duty (United Kingdom).

    Science.gov (United States)

    2010-10-01

    ... (United Kingdom). 252.229-7008 Section 252.229-7008 Federal Acquisition Regulations System DEFENSE... CLAUSES Text of Provisions And Clauses 252.229-7008 Relief from import duty (United Kingdom). As prescribed in 229.402-70(h), use the following clause: Relief from Import Duty (United Kingdom) (JUN...

  13. 48 CFR 252.229-7006 - Value added tax exclusion (United Kingdom).

    Science.gov (United States)

    2010-10-01

    ... (United Kingdom). 252.229-7006 Section 252.229-7006 Federal Acquisition Regulations System DEFENSE... CLAUSES Text of Provisions And Clauses 252.229-7006 Value added tax exclusion (United Kingdom). As prescribed in 229.402-70(f), use the following clause: Value Added Tax Exclusion (United Kingdom) (JUN...

  14. 48 CFR 252.211-7004 - Alternate preservation, packaging, and packing.

    Science.gov (United States)

    2010-10-01

    ..., packaging, and packing. 252.211-7004 Section 252.211-7004 Federal Acquisition Regulations System DEFENSE... CLAUSES Text of Provisions And Clauses 252.211-7004 Alternate preservation, packaging, and packing. As prescribed in 211.272, use the following provision: Alternate Preservation, Packaging, and Packing (DEC...

  15. 48 CFR 252.216-7001 - Economic price adjustment-nonstandard steel items.

    Science.gov (United States)

    2010-10-01

    ...-nonstandard steel items. 252.216-7001 Section 252.216-7001 Federal Acquisition Regulations System DEFENSE... CLAUSES Text of Provisions And Clauses 252.216-7001 Economic price adjustment—nonstandard steel items. As prescribed in 216.203-4-70(b), use the following clause: Economic Price Adjustment—Nonstandard Steel...

  16. 38 CFR 3.252 - Annual income; pension; Mexican border period and later war periods.

    Science.gov (United States)

    2010-07-01

    ... 38 Pensions, Bonuses, and Veterans' Relief 1 2010-07-01 2010-07-01 false Annual income; pension; Mexican border period and later war periods. 3.252 Section 3.252 Pensions, Bonuses, and Veterans' Relief... Dependency, Income and Estate § 3.252 Annual income; pension; Mexican border period and later war periods....

  17. 48 CFR 252.222-7004 - Compliance with Spanish social security laws and regulations.

    Science.gov (United States)

    2010-10-01

    ... Condition of the Enterprise) from the Ministerio de Trabajo y S.S., Tesoreria General de la Seguridad Social... social security laws and regulations. 252.222-7004 Section 252.222-7004 Federal Acquisition Regulations... PROVISIONS AND CONTRACT CLAUSES Text of Provisions And Clauses 252.222-7004 Compliance with Spanish...

  18. 48 CFR 252.225-7037 - Evaluation of Offers for Air Circuit Breakers.

    Science.gov (United States)

    2010-10-01

    ... Air Circuit Breakers. 252.225-7037 Section 252.225-7037 Federal Acquisition Regulations System DEFENSE... CLAUSES Text of Provisions And Clauses 252.225-7037 Evaluation of Offers for Air Circuit Breakers. As prescribed in 225.7006-4(a), use the following provision: Evaluation of Offers for Air Circuit Breakers...

  19. 48 CFR 252.222-7005 - Prohibition on use of nonimmigrant aliens-Guam.

    Science.gov (United States)

    2010-10-01

    ... nonimmigrant aliens-Guam. 252.222-7005 Section 252.222-7005 Federal Acquisition Regulations System DEFENSE... CLAUSES Text of Provisions And Clauses 252.222-7005 Prohibition on use of nonimmigrant aliens—Guam. As prescribed in 222.7302, use the following clause: Prohibition on Use of Nonimmigrant Aliens—Guam (SEP...

  20. 44 CFR 206.252 - Insurance requirements for facilities damaged by flood.

    Science.gov (United States)

    2010-10-01

    ... facilities damaged by flood. 206.252 Section 206.252 Emergency Management and Assistance FEDERAL EMERGENCY... Assistance Insurance Requirements § 206.252 Insurance requirements for facilities damaged by flood. (a) Where an insurable building damaged by flooding is located in a special flood hazard area identified...

  1. 48 CFR 252.204-7001 - Commercial and Government Entity (CAGE) code reporting.

    Science.gov (United States)

    2010-10-01

    ... Entity (CAGE) code reporting. 252.204-7001 Section 252.204-7001 Federal Acquisition Regulations System... Entity (CAGE) Code Reporting (AUG 1999) (a) The offeror is requested to enter its CAGE code on its offer... AND CONTRACT CLAUSES Text of Provisions And Clauses 252.204-7001 Commercial and Government...

  2. 48 CFR 252.242-7004 - Material management and accounting system.

    Science.gov (United States)

    2010-10-01

    ..., inventory, accounting, or other systems. (2) Valid time-phased requirements means material that is— (i... accounting system. 252.242-7004 Section 252.242-7004 Federal Acquisition Regulations System DEFENSE... CLAUSES Text of Provisions And Clauses 252.242-7004 Material management and accounting system....

  3. Compound dual radiation action theory for 252Cf brachytherapy.

    Science.gov (United States)

    Wang, C K; Zhang, X

    2004-01-01

    The existing dosimetry protocol that uses the concept of RBE for 252Cf brachytherapy contains large uncertainties. A new formula has been developed to correlate the biological effect (i.e. cell survival fraction) resulting from a mixed n + gamma radiation field with two physical quantities and two biological quantities. The formula is based on a pathway model evolved from that of the compound-dual-radiation-action (CDRA) theory, previously proposed by Rossi and Zaider. The new model employs the recently published data on radiation-induced DNA lesions. The new formula is capable of predicting quantitatively the synergistic effect caused by the interactions between neutron events and gamma ray events, and it is intended to be included into a new dosimetry protocol for future 252Cf brachytherapy.

  4. Neutron shielding for a {sup 252} Cf source

    Energy Technology Data Exchange (ETDEWEB)

    Vega C, H.R.; Manzanares A, E.; Hernandez D, V.M. [Unidades Academicas de Estudios Nucleares e Ingenieria Electrica, Universidad Autonoma de Zacatecas, C. Cipres 10, Fracc. La Penuela, 98068 Zacatecas (Mexico); Eduardo Gallego, Alfredo Lorente [Depto. de Ingenieria Nuclear, ETS Ingenieros Industriales, Universidad Politecnica de Madrid, C. Jose Gutierrez Abascal 2, 28006 Madrid (Spain)]. e-mail: fermineutron@yahoo.com

    2006-07-01

    To determine the neutron shielding features of water-extended polyester a Monte Carlo study was carried out. Materials with low atomic number are predominantly used for neutron shielding because these materials effectively attenuate neutrons, mainly through inelastic collisions and absorption reactions. During the selection of materials to design a neutron shield, prompt gamma production as well as radionuclide production induced by neutron activation must be considered. In this investigation the Monte Carlo method was used to evaluate the performance of a water-extended polyester shield designed for the transportation, storage, and use of a {sup 252}Cf isotopic neutron source. During calculations a detailed model for the {sup 252}Cf and the shield was utilized. To compare the shielding features of water extended polyester, the calculations were also made for the bare {sup 252}Cf in vacuum, air and the shield filled with water. For all cases the calculated neutron spectra was utilized to determine the ambient equivalent neutron dose at four sites around the shielding. In the case of water extended polyester and water shielding the calculations were extended to include the prompt gamma rays produced during neutron interactions, with this information the Kerma in air was calculated at the same locations where the ambient equivalent neutron dose was determined. (Author)

  5. Planned Closeout of the Cf-252 Loan/Lease Program

    Energy Technology Data Exchange (ETDEWEB)

    Sherman, Steven R [ORNL; Patton, Bradley D [ORNL

    2012-09-01

    New funding is sought to pursue planned closeout of the Cf-252 Loan Program. The work will be performed in phases. In the initial phase, users will be surveyed to determine whether they wish to take ownership of sources in their possession, or return them. In the second phase, sources will be recalled from non-DOE entities, and source ownership transfers will be performed. In the third phase, the remaining sources from DOE entities will be recalled. Initial funding of $350K is sought to fund the first phase, and to plan execution of the remaining phases given information collected from user surveys.

  6. Material recognition by using a tagged {sup 252}Cf source

    Energy Technology Data Exchange (ETDEWEB)

    Viesti, G. [Dipartimento di Fisica dell Universita di Padova, Via Marzolo 8, I-35131 Padova (Italy); INFN Sezione di Padova, Via Marzolo 8, I-35131 Padova (Italy)], E-mail: viesti@pd.infn.it; Cossutta, L. [Dipartimento di Fisica dell' Universita di Padova, Via Marzolo 8, I-35131 Padova (Italy); Fabris, D. [INFN Sezione di Padova, Via Marzolo 8, I-35131 Padova (Italy); Lunardon, M.; Moretto, S. [Dipartimento di Fisica dell Universita di Padova, Via Marzolo 8, I-35131 Padova (Italy); INFN Sezione di Padova, Via Marzolo 8, I-35131 Padova (Italy); Nebbia, G.; Pesente, S. [INFN Sezione di Padova, Via Marzolo 8, I-35131 Padova (Italy); Pino, F.; Sajo-Bohus, L. [Universidad Simon-Bolivar, Laboratorio Fisica Nuclear, Apartado 8900, 1080 A. Caracas (Venezuela, Bolivarian Republic of)

    2008-08-11

    Material recognition by measuring simultaneously the transmission of neutron and gamma ray produced by a {sup 252}Cf source has been studied, determining the average atomic number resolving power. In addition, it is demonstrated the possibility to derive direct signatures able to identify light elements (C, N, O) using the measured transmission versus neutron time-of-flight. This allows one to determine the relevant elemental ratios (C/O and C/N) normally used to identify threat organic materials such as explosives and drugs.

  7. Terahertz Transmission Imaging with 2.52 THz Continuous Wave

    Institute of Scientific and Technical Information of China (English)

    Xiao-Tong Guan; De-Wei Zheng; Min Hu; Wen-Jie Fu; Yu-Meng Cui; Xiang Fan; Liang Zhang; Ye Yuan; Jing-Yuan Xu; Yuan Li

    2013-01-01

    In this article, two terahertz transmission imaging systems are built with a 2.52 THz continuous wave laser and two types of sensors. One is array scanning system using a 124×124 pyro-electric array camera as the detector; the other is a point-wise scanning system utilizing a Golay cell as the detector. The imaging speed and quality is briefly analyzed. Terahertz (THz) imaging results demonstrate that the array scanning system has higher imaging speed with lower resolution. The point-wise scanning system has higher imaging quality with lower speed.

  8. Termocoagulación facetaria lumbar: Experiencia en 252 pacientes Thermocoagulation of lumbar facet joints: Experience in 252 patients

    OpenAIRE

    2005-01-01

    Se presentan 252 pacientes con el diagnóstico de dolor lumbar facetario a los que se le realizó la técnica quirúrgica de termocoagulación percutánea de la faceta articular. Nuestro propósito principal fue aliviar el dolor en estos pacientes, evaluamos la eficacia de la técnica con un 74,7% de resultados quirúrgicos satisfactorios, así como la descripción de diferentes aspectos como: edad, sexo, causas y la topografía segmentaria del dolor.Two hundred fifty two patients with diagnosis of lumba...

  9. 48 CFR 252.222-7006 - Restrictions on the Use of Mandatory Arbitration Agreements.

    Science.gov (United States)

    2010-10-01

    ... Mandatory Arbitration Agreements. 252.222-7006 Section 252.222-7006 Federal Acquisition Regulations System... Arbitration Agreements. As prescribed in 222.7404, use the following clause: Restrictions on the Use of Mandatory Arbitration Agreements (MAY 2010) (a) Definitions. As used in this clause— Covered...

  10. 48 CFR 252.225-7019 - Restriction on acquisition of anchor and mooring chain.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Restriction on acquisition of anchor and mooring chain. 252.225-7019 Section 252.225-7019 Federal Acquisition Regulations System DEFENSE ACQUISITION REGULATIONS SYSTEM, DEPARTMENT OF DEFENSE CLAUSES AND FORMS SOLICITATION...

  11. 48 CFR 252.209-7005 - Reserve Officer Training Corps and military recruiting on campus.

    Science.gov (United States)

    2010-10-01

    ...: Reserve Officer Training Corps and Military Recruiting on Campus (JAN 2000) (a) Definition. “Institution... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Reserve Officer Training Corps and military recruiting on campus. 252.209-7005 Section 252.209-7005 Federal...

  12. 48 CFR 252.229-7010 - Relief from customs duty on fuel (United Kingdom).

    Science.gov (United States)

    2010-10-01

    ... on fuel (United Kingdom). 252.229-7010 Section 252.229-7010 Federal Acquisition Regulations System... (United Kingdom). As prescribed in 229.402-70(j), use the following clause: Relief from Customs Duty on Fuel (United Kingdom) (JUN 1997) (a) Pursuant to an agreement between the United States Government...

  13. 48 CFR 252.225-7001 - Buy American Act and Balance of Payments Program.

    Science.gov (United States)

    2010-10-01

    ... Balance of Payments Program. 252.225-7001 Section 252.225-7001 Federal Acquisition Regulations System... Payments Program. As prescribed in 225.1101(2), use the following clause: Buy American Act and Balance of... products in the Buy American Act—Balance of Payments Program Certificate provision of the solicitation....

  14. 48 CFR 252.225-7030 - Restriction on Acquisition of Carbon, Alloy, and Armor Steel Plate.

    Science.gov (United States)

    2010-10-01

    ... of Carbon, Alloy, and Armor Steel Plate. 252.225-7030 Section 252.225-7030 Federal Acquisition... Acquisition of Carbon, Alloy, and Armor Steel Plate. As prescribed in 225.7011-3, use the following clause: Restriction on Acquisition of Carbon, Alloy, and Armor Steel Plate (DEC 2006) (a) Carbon, alloy, and...

  15. 8 CFR 252.5 - Special procedures for deserters from Spanish or Greek ships of war.

    Science.gov (United States)

    2010-01-01

    ... Spanish or Greek ships of war. 252.5 Section 252.5 Aliens and Nationality DEPARTMENT OF HOMELAND SECURITY... Greek ships of war. (a) General. Under E.O. 11267 of January 19, 1966 (31 FR 807) and 28 CFR 0.109, and... a ship of war of that government, while in any port of the United States, and on proof by...

  16. 48 CFR 252.227-7038 - Patent Rights-Ownership by the Contractor (Large Business).

    Science.gov (United States)

    2010-10-01

    ... Contractor (Large Business). As prescribed in 227.303(2), use the following clause: Patent Rights—Ownership... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Patent Rights-Ownership by the Contractor (Large Business). 252.227-7038 Section 252.227-7038 Federal Acquisition...

  17. 48 CFR 252.229-7004 - Status of contractors as a direct contractor (Spain).

    Science.gov (United States)

    2010-10-01

    ... direct contractor (Spain). 252.229-7004 Section 252.229-7004 Federal Acquisition Regulations System... contractor (Spain). As prescribed in 229.402-70(d), use the following clause: Status of Contractor as a Director Contractor (Spain) (JUN 1997) (a) “Direct Contractor,” as used in this clause, means an...

  18. 48 CFR 252.225-7038 - Restriction on Acquisition of Air Circuit Breakers.

    Science.gov (United States)

    2010-10-01

    ... of Air Circuit Breakers. 252.225-7038 Section 252.225-7038 Federal Acquisition Regulations System... Circuit Breakers. As prescribed in 225.7006-4(b), use the following clause: Restriction on Acquisition of Air Circuit Breakers (JUN 2005) Unless otherwise specified in its offer, the Contractor shall...

  19. 48 CFR 252.227-7014 - Rights in noncommercial computer software and noncommercial computer software documentation.

    Science.gov (United States)

    2010-10-01

    ... container and each page, or portions thereof, of printed material containing computer software for which... computer software and noncommercial computer software documentation. 252.227-7014 Section 252.227-7014... Rights in noncommercial computer software and noncommercial computer software documentation....

  20. 48 CFR 252.205-7000 - Provision of information to cooperative agreement holders.

    Science.gov (United States)

    2010-10-01

    ... to cooperative agreement holders. 252.205-7000 Section 252.205-7000 Federal Acquisition Regulations... cooperative agreement holders. As prescribed in 205.470, use the following clause: Provision of Information to Cooperative Agreement Holders (DEC 1991) (a) Definition. Cooperative agreement holder means a State or...

  1. 48 CFR 252.225-7023 - Preference for products or services from Iraq or Afghanistan.

    Science.gov (United States)

    2010-10-01

    ... AND CONTRACT CLAUSES Text of Provisions And Clauses 252.225-7023 Preference for products or services... Products or Services from Iraq or Afghanistan (APR 2010) (a) Definitions. Product from Iraq or Afghanistan... solicitation entitled “Requirement for Products or Services from Iraq or Afghanistan” (DFARS 252.225-7024)....

  2. 48 CFR 252.225-7026 - Acquisition Restricted to Products or Services from Iraq or Afghanistan.

    Science.gov (United States)

    2010-10-01

    ... Products or Services from Iraq or Afghanistan. 252.225-7026 Section 252.225-7026 Federal Acquisition... to Products or Services from Iraq or Afghanistan. As prescribed in 225.7703-5(c), use the following clause: Acquisition Restricted to Products or Services From Iraq or Afghanistan (APR 2010)...

  3. 48 CFR 252.203-7002 - Requirement to Inform Employees of Whistleblower Rights.

    Science.gov (United States)

    2010-10-01

    ... Employees of Whistleblower Rights. 252.203-7002 Section 252.203-7002 Federal Acquisition Regulations System... Whistleblower Rights. As prescribed in 203.970, use the following clause: Requirement To Inform Employees of Whistleblower Rights (JAN 2009) The Contractor shall inform its employees in writing of employee...

  4. The Extreme Type I Planetary Nebula M2-52

    Directory of Open Access Journals (Sweden)

    M. Peña

    2002-01-01

    Full Text Available Se presentan los resultados obtenidos a partir de espectroscopía de alta resolución de la parte central de la nebulosa planetaria bipolar M2-52 que muestra un tipo morfológico Br. Hemos confirmado que M2-52 es una nebulosa de Tipo I de Peimbert, con un espectro rico en líneas de alto y bajo grado de ionización y un fuerte enriquecimiento de He y N. La composición química del gas ionizado es: He/H = 0:165 0:010, O/H = (2:6 0:5 x 10_4, N/O = 2:3 0:3, Ne/O = 0:37 0:10, Ar/O = (9:2 2:0 x 10_3 y S/O > 2:0 x 10_3. La velocidad de expansión de la nebulosa es, en promedio, de 20 2 km s_1 y varía ligeramente dependiendo del ión considerado. Los iones de menor grado de ionización, N+ y S+, muestran vexp _ 18 km s_1, O++ y He+ muestran vexp _ 20 km s_1, en tanto que He++ y H+ muestran vexp _ 22 km s_1. Es posible que la zona de N+ y S+ esté siendo frenada por el anillo de material molecular encontrado alrededor de la estrella.

  5. Shielding design studies for a neutron irradiator system based on a 252Cf source.

    Science.gov (United States)

    da Silva, A X; Crispim, V R

    2001-01-01

    This study aims to investigate a shielding design against neutrons and gamma rays from a source of 252Cf, using Monte Carlo simulation. The shielding materials studied were borated polyethylene, borated-lead polyethylene and stainless steel. The Monte Carlo code MCNP4B was used to design shielding for 252Cf based neutron irradiator systems. By normalising the dose equivalent rate values presented to the neutron production rate of the source, the resulting calculations are independent of the intensity of the actual 252Cf source. The results show that the total dose equivalent rates were reduced significantly by the shielding system optimisation.

  6. Prompt Neutron Emission in 252CF Spontaneous Fission

    Science.gov (United States)

    Hambsch, F.-J.; Oberstedt, S.; Zeynalov, Sh.

    2011-10-01

    The prompt neutron emission in spontaneous fission of 252Cf has been investigated applying digital signal electronics. The goal was to compare the results from digital data acquisition and digital signal processing analysis with results of the pioneering work of Budtz-Jørgensen and Knitter. Using a twin Frisch-grid ionization chamber for fission fragment (FF) detection and a NE213-equivalent neutron detector in total about 107 fission fragment-neutron coincidences have been registered. Fission fragment kinetic energy, mass and angular distribution, neutron time-of-flight and pulse shape have been investigated using a 12 bit waveform digitizer. The signal waveforms have been analyzed using digital signal processing algorithms. The results are in very good agreement with literature. For the first time the dependence of the number of emitted neutrons as a function of total kinetic energy (TKE) of the fragments is in very good agreement with theoretical calculations in the range of TKE from 140-220 MeV.

  7. Neutron Spectra, Fluence and Dose Rates from Bare and Moderated Cf-252 Sources

    Energy Technology Data Exchange (ETDEWEB)

    Radev, Radoslav P. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

    2016-04-01

    A new, stronger 252Cf source (serial number SR-CF-3050-OR) was obtained from Oak Ridge National Laboratory (ORNL) in 2014 to supplement the existing 252Cf sources which had significantly decayed. A new instrument positioning track system was designed and installed by Hopewell Designs, Inc. in 2011. The neutron field from the new, stronger 252Cf source in the modified calibration environment needed to be characterized as well as the modified neutron fields produced by the new source and seven different neutron moderators. Comprehensive information about our 252Cf source, its origin, production, and isotopic content and decay characteristics needed to be compiled as well. This technical report is intended to address these issues.

  8. 48 CFR 252.211-7002 - Availability for examination of specifications, standards, plans, drawings, data item...

    Science.gov (United States)

    2010-10-01

    ... examination of specifications, standards, plans, drawings, data item descriptions, and other pertinent... of Provisions And Clauses 252.211-7002 Availability for examination of specifications, standards... the following provision: Availability for Examination of Specifications, Standards, Plans,...

  9. Functional design criteria for project W-252, phase II liquid effluent treatment and disposal. Revision 2

    Energy Technology Data Exchange (ETDEWEB)

    Hatch, C.E.

    1995-05-01

    This document is the Functional Design Criteria for Project W-252. Project W-252 provides the scope to provide BAT/AKART (best available technology...) to 200 Liquid Effluent Phase II streams (B-Plant). This revision (Rev. 2) incorporates a major descoping of the project. The descoping was done to reflect a combination of budget cutting measures allowed by a less stringent regulatory posture toward the Phase II streams

  10. Termocoagulación facetaria lumbar: Experiencia en 252 pacientes Thermocoagulation of lumbar facet joints: Experience in 252 patients

    Directory of Open Access Journals (Sweden)

    J. E. Martínez-Suárez

    2005-10-01

    Full Text Available Se presentan 252 pacientes con el diagnóstico de dolor lumbar facetario a los que se le realizó la técnica quirúrgica de termocoagulación percutánea de la faceta articular. Nuestro propósito principal fue aliviar el dolor en estos pacientes, evaluamos la eficacia de la técnica con un 74,7% de resultados quirúrgicos satisfactorios, así como la descripción de diferentes aspectos como: edad, sexo, causas y la topografía segmentaria del dolor.Two hundred fifty two patients with diagnosis of lumbar facet joint pain underwent the surgical technique of percutaneous thermocoagulation of the facet joint. Our major aim was to relief pain in those patients. We assess the effectiveness of the technique, with 74.7% of surgical success, and we also describe different aspects such as: age, sex, causes and segmentary pain topography.

  11. 78 FR 21567 - Installation of Radiation Alarms for Rooms Housing Neutron Sources

    Science.gov (United States)

    2013-04-11

    ... californium-252 (Cf-252). A licensee's decision to use a specific type of source may depend upon cost, availability, and the dependence upon historical data with which to compare current measurement results. The...

  12. Principles of dosimetric planning in contact therapy with high-energy Cf-252 sources

    Energy Technology Data Exchange (ETDEWEB)

    Chekhonadskij, V.N.; Merkle, K.

    1987-11-01

    In clinical practice, some dosimetric problems of contact therapy with Cf-252 are not yet sufficiently clarified. One possibility to solve these problems is to apply the conception of total photon-equivalent energy dose. This conception serves to calculate clinical guidance values of the RBE of the Cf-252-neutron constituent for late effects in dependence on the total dose rate of the mixed radiation. The correlations indicated are valid for dose rates of 0.05 to 4 Gy/h and 4 to 1.25 . 10/sup 4/ Gy/h. On the basis of these functional correlations and taking into consideration the critical normal tissues of rectum and urinary bladder, the minimum RBE values of the tumors are indicated which allow a therapeutic effect of more than 1 in case of application of Cf-252. The formulas for the RBE dependence of the Cf-252 neutron constituent on the total doses rate permit to take into account any modifications of this value caused by varying source distances in contact therapy. It is concluded from these investigations that in oncologic patients, better results are to be expected from a treatment with high-energy Cf-252 sources than with low-energy sources, if the other treatment conditions are identical.

  13. Synthesis and mixed lineage kinase activity of pyrrolocarbazole and isoindolone analogs of (+)K-252a.

    Science.gov (United States)

    Hudkins, Robert L; Johnson, Neil W; Angeles, Thelma S; Gessner, George W; Mallamo, John P

    2007-02-08

    Structural modification of the indolecarbazole natural product (+)K-252a identified structural requirements for MLK activity and a novel series of potent fused pyrrolocarbazole MLK1/3 inhibitors. The SAR revealed that the lactam regiochemistry, the shape of the heterocycle, and aryl rings B and F are important to MLK activity. Heteroatom and alkyl replacement of the N-12 and/or N-13 indole nitrogen atoms identified the nonplanar dihydronaphthyl[3,4-a]pyrrolo[3,4-c]carbazole-7-one (8) and corresponding 5,7-dione (7) as potent cell-permeable MLK1/3 family-selective leads with in vitro activity comparable to that of (+)K-252a and determined them to be 2- to 3-fold more potent than the aglycone natural product K-252c.

  14. Fluence-to-dose equivalent conversion factors for polyethylene-moderated {sup 252}Cf

    Energy Technology Data Exchange (ETDEWEB)

    Tanner, J.E.; Soldat, K.L.; Stewart, R.D. [Pacific Northwest Lab., Richland, WA (United States); Casson, W.H. [Los Alamos National Lab., NM (United States)

    1994-04-01

    Neutron measurements and calculations were conducted to characterize the polyethylene-moderated {sup 252}Cf source at Oak Ridge National Laboratory`s Radiation Calibration Laboratory (RADCAL). The 12-inch-diameter polyethylene sphere produces a highly scattered neutron spectrum which is more representative of most radiation fields found in the workplace than the D{sub 2}O-moderated {sup 252}Cf neutron spectrum typically used for dosimeter calibration. However, the energy-dependent fluence and dose equivalent must be well known before using such a source for radiation protection purposes. The measurements and calculations were performed as independent checks of the desired quantities which were the flux, the absorbed dose rate, the dose equivalent rate, and the average energy. These quantities were determined for the polyethylene sphere with and without an outer cadmium shell and compared with a D{sub 2}O-moderated {sup 252}Cf source.

  15. Synthesis and biological activity of pyrazole analogues of the staurosporine aglycon K252c.

    Science.gov (United States)

    Esvan, Yannick J; Giraud, Francis; Pereira, Elisabeth; Suchaud, Virginie; Nauton, Lionel; Théry, Vincent; Dezhenkova, Lyubov G; Kaluzhny, Dmitry N; Mazov, Vsevolod N; Shtil, Alexander A; Anizon, Fabrice; Moreau, Pascale

    2016-07-15

    A derivative of the staurosporine aglycon (K252c), in which the lactam ring was replaced by a pyrazole moiety, was synthesized. The resulting indolopyrazolocarbazole (3) inhibited Pim isoforms 1-3 whereas it did not impair the activity of two known targets of K252c, protein kinase C isoforms α and γ. Compound 3 exhibited moderate cytotoxic activity toward human leukemia and colon carcinoma cell lines (K562 and HCT116), strongly suggesting that this new scaffold deserves further investigations for treatment of malignancies associated with Pim activity.

  16. 20 CFR 404.252 - Subsequent entitlement to benefits 12 months or more after entitlement to disability benefits ended.

    Science.gov (United States)

    2010-04-01

    ... or more after entitlement to disability benefits ended. 404.252 Section 404.252 Employees' Benefits SOCIAL SECURITY ADMINISTRATION FEDERAL OLD-AGE, SURVIVORS AND DISABILITY INSURANCE (1950- ) Computing Primary Insurance Amounts Special Computation Rules for People Who Had A Period of Disability §...

  17. 48 CFR 252.229-7009 - Relief from customs duty and value added tax on fuel (passenger vehicles) (United Kingdom).

    Science.gov (United States)

    2010-10-01

    ... and value added tax on fuel (passenger vehicles) (United Kingdom). 252.229-7009 Section 252.229-7009... Relief from customs duty and value added tax on fuel (passenger vehicles) (United Kingdom). As prescribed... (Passenger Vehicles) (United Kingdom) (JUN 1997) (a) Pursuant to an agreement between the United...

  18. 48 CFR 252.232-7005 - Reimbursement of subcontractor advance payments-DoD pilot mentor-protege program.

    Science.gov (United States)

    2010-10-01

    ... subcontractor advance payments-DoD pilot mentor-protege program. 252.232-7005 Section 252.232-7005 Federal... subcontractor advance payments—DoD pilot mentor-protege program. As prescribed in 232.412-70(c), use the following clause: Reimbursement of Subcontractor Advance Payments—DoD Pilot Mentor-Protege Program (SEP...

  19. 48 CFR 252.226-7000 - Notice of historically black college or university and minority institution set-aside.

    Science.gov (United States)

    2010-10-01

    ... black college or university and minority institution set-aside. 252.226-7000 Section 252.226-7000... Notice of historically black college or university and minority institution set-aside. As prescribed in 226.370—9(a), use the following clause: Notice of Historically Black College or University...

  20. 48 CFR 252.209-7001 - Disclosure of ownership or control by the government of a terrorist country.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Disclosure of ownership or control by the government of a terrorist country. 252.209-7001 Section 252.209-7001 Federal Acquisition Regulations System DEFENSE ACQUISITION REGULATIONS SYSTEM, DEPARTMENT OF DEFENSE CLAUSES AND FORMS SOLICITATION PROVISIONS AND CONTRACT...

  1. 48 CFR 252.216-7000 - Economic price adjustment-basic steel, aluminum, brass, bronze, or copper mill products.

    Science.gov (United States)

    2010-10-01

    ...-basic steel, aluminum, brass, bronze, or copper mill products. 252.216-7000 Section 252.216-7000 Federal... adjustment—basic steel, aluminum, brass, bronze, or copper mill products. As prescribed in 216.203-4-70(a... Mill Products (JUL 1997) (a) Definitions. As used in this clause— Established price means a price...

  2. 40 CFR 421.252 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the...

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 28 2010-07-01 2010-07-01 true Effluent limitations guidelines... technology currently available. 421.252 Section 421.252 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) EFFLUENT GUIDELINES AND STANDARDS NONFERROUS METALS MANUFACTURING POINT...

  3. 48 CFR 53.236-2 - Architect-engineer services (SF's 252 and 330).

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 2 2010-10-01 2010-10-01 false Architect-engineer... ACQUISITION REGULATION (CONTINUED) CLAUSES AND FORMS FORMS Prescription of Forms 53.236-2 Architect-engineer services (SF's 252 and 330). The following forms are prescribed for use in contracting for...

  4. 48 CFR 252.219-7004 - Small business subcontracting plan (test program).

    Science.gov (United States)

    2010-10-01

    ... AND CONTRACT CLAUSES Text of Provisions And Clauses 252.219-7004 Small business subcontracting plan... contract or subcontract. (b) The Offeror's comprehensive small business subcontracting plan and its... “Utilization of Small Business Concerns,” or (2) an approved plan required by this clause, shall be a...

  5. 48 CFR 252.227-7006 - License grant-running royalty.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false License grant-running... of Provisions And Clauses 252.227-7006 License grant—running royalty. As prescribed at 227.7009-4(a...—Running Royalty (AUG 1984) (a) The Contractor hereby grants to the Government, as represented by...

  6. 48 CFR 252.227-7007 - License term-running royalty.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false License term-running... of Provisions And Clauses 252.227-7007 License term—running royalty. As prescribed at 227.7009-4(b), insert the following clause in patent releases, license agreements, and assignments: License...

  7. 48 CFR 252.225-7033 - Waiver of United Kingdom levies.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Waiver of United Kingdom... of Provisions And Clauses 252.225-7033 Waiver of United Kingdom levies. As prescribed in 225.1101(9), use the following clause: Waiver of United Kingdom Levies (APR 2003) (a) The U.S. Government...

  8. 48 CFR 252.225-7044 - Balance of Payments Program-Construction Material.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Balance of Payments... AND CONTRACT CLAUSES Text of Provisions And Clauses 252.225-7044 Balance of Payments Program—Construction Material. As prescribed in 225.7503(a), use the following clause: Balance of Payments...

  9. 48 CFR 252.228-7006 - Compliance with Spanish laws and insurance.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Compliance with Spanish... CLAUSES Text of Provisions And Clauses 252.228-7006 Compliance with Spanish laws and insurance. As prescribed at 228.370(e), use the following clause: Compliance with Spanish Laws and Insurance (DEC 1998)...

  10. 48 CFR 252.236-7003 - Payment for mobilization and preparatory work.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Payment for mobilization... CLAUSES Text of Provisions And Clauses 252.236-7003 Payment for mobilization and preparatory work. As prescribed in 236.570(b)(2), use the following clause: Payment for Mobilization and Preparatory Work...

  11. 48 CFR 252.236-7004 - Payment for mobilization and demobilization.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Payment for mobilization... CLAUSES Text of Provisions And Clauses 252.236-7004 Payment for mobilization and demobilization. As prescribed in 236.570(b)(2), use the following clause: Payment for Mobilization and Demobilization (DEC...

  12. Tagging fast neutrons from a 252Cf fission-fragment source

    CERN Document Server

    Scherzinger, Julius; Annand, John; Fissum, Kevin; Hall-Wilton, Richard; Mauritzson, Nicholai; Messi, Francesco; Perrey, Hanno; Rofors, Emil

    2016-01-01

    Coincidence and time-of-flight measurement techniques are employed to tag fission neutrons emitted from a 252Cf source. Fission fragments detected in a gaseous 4He scintillator detector supply the tag. Neutrons are detected in a NE-213 liquid-scintillator detector. The resulting continuous polychromatic beam of tagged neutrons has an energy dependence that agrees qualitatively with expectations.

  13. 46 CFR 252.22 - Substantiality and extent of foreign-flag competition.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 8 2010-10-01 2010-10-01 false Substantiality and extent of foreign-flag competition... WORLDWIDE SERVICES Operation § 252.22 Substantiality and extent of foreign-flag competition. (a) Type and tonnage groupings. Foreign-flag competition shall be determined, as of January 1 of the year...

  14. Yeast Interacting Proteins Database: YBR135W, YBR252W [Yeast Interacting Proteins Database

    Lifescience Database Archive (English)

    Full Text Available bait as prey (0) YBR252W DUT1 dUTPase, catalyzes hydrolysis of dUTP to dUMP and PPi, thereby...ription dUTPase, catalyzes hydrolysis of dUTP to dUMP and PPi, thereby preventing incorporation of uracil in

  15. 48 CFR 252.239-7012 - Title to telecommunication facilities and equipment.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Title to telecommunication... CLAUSES Text of Provisions And Clauses 252.239-7012 Title to telecommunication facilities and equipment. As prescribed in 239.7411(b), use the following clause: Title to Telecommunication Facilities...

  16. LARGE GAMMA ANISOTROPY OBSERVED IN THE CF-252 SPONTANEOUS-FISSION PROCESS

    NARCIS (Netherlands)

    VANDERPLOEG, H; BACELAR, JC; VANDENBERG, T; IACOB, VE; JONGMAN, [No Value; VANDERWOUDE, A

    1992-01-01

    The energy spectrum and the angular dependence relative to the fission direction of photons in the energy region between 2 and 40 MeV have been measured for the spontaneous fission of Cf-252. A large anisotropy was found in the energy region 8 to 12 MeV implying that photons in this region are emitt

  17. STUDY OF THE GAMMA EMISSION PROBABILITY ACCOMPANYING THE SPONTANEOUS FISSION OF CF-252

    NARCIS (Netherlands)

    VANDERPLOEG, H; LAURENS, CR; BACELAR, JCS; BUDA, A; GAARDHOJE, JJ; VANTHOF, G; KALANTARNAYESTANAKI, N; VANDERWOUDE, A; ZELAZNY, Z

    1994-01-01

    A study of the gamma emission accompanying the spontaneous fission process of Cf-252 has been performed. The photon emission probability between 3 and 70 MeV and its angular dependence with respect to the fission direction were measured. These measurements were performed as a function of the mass as

  18. 48 CFR 252.227-7012 - Patent license and release contract.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Patent license and release... of Provisions And Clauses 252.227-7012 Patent license and release contract. As prescribed at 227.7012, insert the following clause in patent releases, license agreements, and assignments: (Contract...

  19. 48 CFR 252.227-7039 - Patents-reporting of subject inventions.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Patents-reporting of... CLAUSES Text of Provisions And Clauses 252.227-7039 Patents—reporting of subject inventions. As prescribed in 227.303(1), use the following clause: Patents—Reporting of Subject Inventions (APR 1990)...

  20. 7 CFR 1710.252 - Construction work plans-power supply borrowers.

    Science.gov (United States)

    2010-01-01

    ... 7 Agriculture 11 2010-01-01 2010-01-01 false Construction work plans-power supply borrowers. 1710... LOANS AND GUARANTEES Construction Work Plans and Related Studies § 1710.252 Construction work plans..., environmental and other studies and plans needed to support the construction of facilities, when such cost...

  1. 48 CFR 252.239-7016 - Telecommunications security equipment, devices, techniques, and services.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Telecommunications... SOLICITATION PROVISIONS AND CONTRACT CLAUSES Text of Provisions And Clauses 252.239-7016 Telecommunications... clause: Telecommunications Security Equipment, Devices, Techniques, and Services (DEC 1991)...

  2. 一种仿252Cf中子源脉冲信号频谱分析的FPGA设计与实现%A Design and Realization of Simulated 252Cf Nuclear Pulse Spectrum Analysis System Based on FPGA

    Institute of Scientific and Technical Information of China (English)

    李鹏程; 魏彪

    2011-01-01

    252Cf自发裂变中子源之裂变中子在时间分布上相互独立的基本原理出发,针对随机核信号在时间上呈泊松分布,在幅度上服从高斯分布的这一特征,开展了基于FPGA技术的仿252Cf中子源随机核信号产生及其频谱分析系统的研究.通过比较仿252Cf中子源核信号与核信号的功率谱趋势,验证了仿252Cf中子源随机信号产生机制的可靠性.研究表明,将FPGA技术运用仿核信号频谱分析是可行的,仿核随机信号的频谱分析研究工作为今后将此技术移植于核信号打下了基础.%From the basic principle of independent distribution on time of spontaneous fission neutrons source 252 Cf and according to the characteristics that nuclear random signal taking on Poisson distribution on time and Gaussian distribution on amplitude, do some researches on simulated 252Cf signal generator and its spectrum analysis based on FPCA. By comparing the power spectrum of simulated nuclear signal and nuclear signal verify that the simulation 252Cf neutron source random signal generation mechanism is reliable. The results show that using of FPCA technology on spectrum analysis of simulated nuclear signal can work, this paper have provided fundamental base for the further research that transplant the technology of spectrum analysis of simulated 252Cf source on 252Cf source random signal.

  3. 利用示踪252Cf中子源的材料鉴别技术%Material Recognition by Using 252Cf Source

    Institute of Scientific and Technical Information of China (English)

    郝昕; L. Sajo-Bohus; 竺礼华; L. Stevanato; D. Fabris; M. Lunardon; S. Moretto; G. Nebbia; S. Pesente; G. Viesti

    2011-01-01

    Non-destructive assay of parcels using a tagged 252Cf source and time of flight technique was studied.The method of material recognition was achieved by measuring simultaneously the transmission of neutron and gamma ray to determine the average atomic number.The automatic tomography was realized with the movement of motors and autostart of the digital acquisition system.With the calibration of the detectors, the average atomic number for each pixel of the sample was determined which allows one to recognize material with this method.%本文叙述了利用252Cf裂变中子源结合飞行时间技术对包裹进行无损检测的可行性研究,通过联合测量中子和伽玛射线的吸收谱确定样品的平均原子序数,完成被测材料的鉴定.实验采用自发裂变的252Cf中子源作为白中子源和伽马射线源,用塑料闪烁探测器探测中子和伽马射线.通过LabVIEW程序控制步进电机运动并整合获取的实验数据,实现了待测样品断层扫描数据采集工作的自动化.在对闪烁探测器进行能量和时间刻度后,对几种典型材料组成的样品进行实验分析,采集数据重建其分布图像,确认了用这项技术对材料无损检测的可行性.

  4. Bacterial community shift in the coastal Gulf of Mexico salt-marsh sediment microcosm in vitro following exposure to the Mississippi Canyon Block 252 oil (MC252)

    KAUST Repository

    Koo, Hyunmin

    2014-07-10

    In this study, we examined the responses by the indigenous bacterial communities in salt-marsh sediment microcosms in vitro following treatment with Mississippi Canyon Block 252 oil (MC252). Microcosms were constructed of sediment and seawater collected from Bayou La Batre located in coastal Alabama on the Gulf of Mexico. We used an amplicon pyrosequencing approach on microcosm sediment metagenome targeting the V3–V5 region of the 16S rRNA gene. Overall, we identified a shift in the bacterial community in three distinct groups. The first group was the early responders (orders Pseudomonadales and Oceanospirillales within class Gammaproteobacteria), which increased their relative abundance within 2 weeks and were maintained 3 weeks after oil treatment. The second group was identified as early, but transient responders (order Rhodobacterales within class Alphaproteobacteria; class Epsilonproteobacteria), which increased their population by 2 weeks, but returned to the basal level 3 weeks after oil treatment. The third group was the late responders (order Clostridiales within phylum Firmicutes; order Methylococcales within class Gammaproteobacteria; and phylum Tenericutes), which only increased 3 weeks after oil treatment. Furthermore, we identified oil-sensitive bacterial taxa (order Chromatiales within class Gammaproteobacteria; order Syntrophobacterales within class Deltaproteobacteria), which decreased in their population after 2 weeks of oil treatment. Detection of alkane (alkB), catechol (C2,3DO) and biphenyl (bph) biodegradation genes by PCR, particularly in oil-treated sediment metacommunity DNA, delineates proliferation of the hydrocarbon degrading bacterial community. Overall, the indigenous bacterial communities in our salt-marsh sediment in vitro microcosm study responded rapidly and shifted towards members of the taxonomic groups that are capable of surviving in an MC252 oil-contaminated environment.

  5. On the use of a (252Cf-3He) assembly for landmine detection by the neutron back-scattering method.

    Science.gov (United States)

    Elsheikh, N; Viesti, G; ElAgib, I; Habbani, F

    2012-04-01

    Experiments were carried out to optimize the performance of the neutron back-scattering (NBS) technique in landmine detection using an assembly consisting of three different layers placed above a (252)Cf neuron source, producing about 10(4)s(-1), in conjunction with a (3)He detector. The assembly was optimized experimentally. The selected assembly configuration was then examined against different (252)Cf stand-off distances and mine burial depths using dummy landmines. Furthermore, Monte Carlo simulations were performed to study the effect of the shield when a (252)Cf source in the range 10(4)-10(7)s(-1) was employed, and to optimize the geometry for future prototypes.

  6. Microbial response to the MC252 Oil and Corexit 9500 in the Gulf of Mexico

    Directory of Open Access Journals (Sweden)

    Romy eChakraborty

    2012-10-01

    Full Text Available The Deepwater Horizon spill released over 4.1 million barrels of crude oil into the Gulf of Mexico. In an effort to mitigate large oil slicks, the dispersant Corexit 9500 was sprayed onto surface slicks and injected directly at the wellhead at water depth of 1,500 meters. Several research groups were involved in investigating the fate of the MC-252 oil using newly advanced molecular tools to elucidate microbial interactions with oil, gases and dispersant. Presented here is a comprehensive overview of the ecogenomics of microbial degradation of MC-252 oil and gases in the water column and shorelines and some insight into the fate of the dispersant Corexit 9500 that was added to aid in oil dispersion process. We also present data that show the dispersant was not toxic to the indigenous microbes at concentrations added, and several bacterial species were able to degrade the various components of Corexit 9500.

  7. Validation of IRDFF in 252Cf Standard and IRDF-2002 Reference Neutron Fields

    Directory of Open Access Journals (Sweden)

    Simakov Stanislav

    2016-01-01

    Full Text Available The results of validation of the latest release of International Reactor Dosimetry and Fusion File, IRDFF-1.03, in the standard 252Cf(s.f. and reference 235U(nth,f neutron benchmark fields are presented. The spectrum-averaged cross sections were shown to confirm IRDFF-1.03 in the 252Cf standard spontaneous fission spectrum; that was not the case for the current recommended spectra for 235U(nth,f. IRDFF was also validated in the spectra of the research reactor facilities ISNF, Sigma-Sigma and YAYOI, which are available in the IRDF-2002 collection. The ISNF facility was re-simulated to remove unphysical oscillations in the spectrum. IRDFF-1.03 was shown to reproduce reasonably well the spectrum-averaged data measured in these fields except for the case of YAYOI.

  8. Dynamics of the tri-nuclear system at spontaneous fission of $^{252}$Cf

    CERN Document Server

    Tashkhodjaev, R B; Alpomeshev, E Kh

    2016-01-01

    To describe of dynamics of ternary fission of $^{252}$Cf an equation of motion of the tri-nuclear system is calculated. The fission of the $^{70}$Ni+$^{50}$Ca+$^{132}$Sn channel was chosen as one of the more probable channels of true ternary fission of $^{252}$Cf. The collinearity of ternary fission has been checked by analyzing results of the equation of motion. The results show that if initially all nuclei are placed collinearly (potential energy of this position is the smallest) and the component of the middle fragment's initial velocity which is perpendicular to this line, is zero then ternary fission is collinear, otherwise the non collinear ternary fission takes place.

  9. Application of 252Cf Ionization Chamber in Nuclear Physics Parameter Measurements%252Cf快电离室在核物理参数测量研究中的应用

    Institute of Scientific and Technical Information of China (English)

    周浩军; 宋凌莉; 李建胜; 金宇

    2007-01-01

    介绍了252Cf快电离室的基本原理和技术水平,描述了它在飞行时间测量、探测器效率标定、瞬发中子衰减常数测量以及252Cf源驱动噪声分析技术等核物理参数测量研究中的应用.

  10. Interfacing Of PIC 18F252 Microcontroller with Real Time Clock via I2C Protocol

    Directory of Open Access Journals (Sweden)

    Arnab G. Samanta

    2014-09-01

    Full Text Available This paper describes a microcontroller based digital clock which can be used in real time systems. The system is constructed using PIC18F252 (microcontroller, DS1307 (real time clock IC and its software program is written with C programming language. A 3v battery backup is provided to real time clock IC. Communication between PIC microcontroller and DS1307 takes place through I²C Bus protocol.

  11. Determination of the subcriticality level using the {sup 252}Cf source-detector method

    Energy Technology Data Exchange (ETDEWEB)

    Baeten, P. [SCK-CEN, Boeretang 200, B-2400 Mol (Belgium); Lafuente, A., E-mail: anlafuente@etsii.upm.e [Universidad Politecnica de Madrid, 28006 Madrid (Spain); Janssens, J.; Kochetkov, A. [SCK-CEN, Boeretang 200, B-2400 Mol (Belgium); Pazsit, I. [Chalmers University of Technology, SE-412 96 Goteborg (Sweden); Van Grieken, G.; Van den Eynde, G. [SCK-CEN, Boeretang 200, B-2400 Mol (Belgium)

    2010-05-15

    Measurement and monitoring of reactivity in a subcritical state, e.g. during the loading of a power reactor, has a clear safety relevance. The methods currently available for the measurement of k{sub eff} in stationary subcritical conditions should be improved as they refer to the critical state. This is also very important in the framework of ADS (accelerator driven systems) where the measurement of a subcritical level without knowledge of the critical state is looked for. An alternative way to achieve this is by mean of the {sup 252}Cf source-detector method. The method makes use of three detectors inserted in the reactor: two 'ordinary' neutron detectors and one {sup 252}Cf source-detector which contains a small amount of {sup 252}Cf that introduces neutrons in the system through spontaneous fission. By observing fissions through the detection system and correlating the signals of the three detectors, the reactivity rho (and hence the multiplication factor k) can be determined. Before the actual measurements took place, a suitable data acquisition system was realized in order to process the signals and compute the auto and cross power spectral densities. The measurements were then performed in the VENUS reactor, using the {sup 252}Cf source-detector and two BF{sub 3} neutron detectors. The multiplication factor was determined using the Cf source method and compared with measurements using other methods and with computational results (Monte Carlo simulations). The Cf method was benchmarked at a UOX core to other experimental methods that used the critical state as reference and to calculations. Afterwards, the Cf source technique was analyzed in a MOX core to study the possible impact of a significant intrinsic source on the results. This benchmarking gives the possibility to validate the Cf method as a reliable technique for the measurement of subcritical levels in steady state and for cores with an intrinsic source like MOX or burnt fuel cores.

  12. Functional design criteria for Project W-252, Phase II Liquid Effluent Treatment and Disposal: Revision 1

    Energy Technology Data Exchange (ETDEWEB)

    Hatch, C.E.

    1994-11-10

    This document provides the functional design criteria required for the Phase 2 Liquid Effluent Treatment and Disposal Project, Project W-252. Project W-252 shall provide new facilities and existing facility modifications required to implement Best Available Technology/All Known, Available, and Reasonable Methods of Prevention, Control, and Treatment (BAT/AKART) for the 200 East Phase II Liquid Effluent Streams. The project will also provide a 200 East Area Phase II Effluent Collection System (PTECS) for connection to a disposal system for relevant effluent streams to which BAT/AKART has been applied. Liquid wastestreams generated in the 200 East Area are currently discharged to the soil column. Included in these wastestreams are cooling water, steam condensate, raw water, and sanitary wastewaters. It is the policy of the DOE that the use of soil columns to treat and retain radionuclides and nonradioactive contaminants be discontinued at the earliest practical time in favor of wastewater treatment and waste minimization. In 1989, the DOE entered into an interagency agreement with Ecology and EPA. This agreement is referred to as the Hanford Federal Facility Agreement and Consent Order (Tri-Party Agreement). Project W-252 is one of the projects required to achieve the milestones set forth in the Tri-Party Agreement. One of the milestones requires BAT/AKART implementation for Phase II streams by October 1997. This Functional Design Criteria (FDC) document provides the technical baseline required to initiate Project W-252 to meet the Tri-Party Agreement milestone for the application of BAT/AKART to the Phase II effluents.

  13. State Waste Discharge Permit application for industrial discharge to land: 200 East Area W-252 streams

    Energy Technology Data Exchange (ETDEWEB)

    1993-12-01

    This document constitutes the WAC 173-216 State Waste Discharge Permit application for six W-252 liquid effluent streams at the Hanford Site. Appendices B through H correspond to Section B through H in the permit application form. Within each appendix, sections correspond directly to the respective questions on the application form. The appendices include: Product or service information; Plant operational characteristics; Water consumption and waterloss; Wastewater information; Stormwater; Other information; and Site assessment.

  14. A Young Eclipsing Binary and its Luminous Neighbors in the Embedded Star Cluster Sh 2-252E

    CERN Document Server

    Lester, Kathryn V; Guo, Zhao

    2016-01-01

    We present a photometric and light curve analysis of an eccentric eclipsing binary in the K2 Campaign 0 field that resides in Sh 2-252E, a young star cluster embedded in an H II region. We describe a spectroscopic investigation of the three brightest stars in the crowded aperture to identify which is the binary system. We find that none of these stars are components of the eclipsing binary system, which must be one of the fainter nearby stars. These bright cluster members all have remarkable spectra: Sh 2-252a (EPIC 202062176) is a B0.5 V star with razor sharp absorption lines, Sh 2-252b is a Herbig A0 star with disk-like emission lines, and Sh 2-252c is a pre-main sequence star with very red color.

  15. Frequency spectrum analysis of 252Cf neutron source based on LabVIEW%基于LabVIEW的252Cf中子源频谱分析

    Institute of Scientific and Technical Information of China (English)

    米德伶; 李鹏程

    2011-01-01

    The frequency spectrum analysis of 252Cf Neutron source is an extremely important method in nuclear stochastic signal processing.Focused on the special “0” and “1” structure of neutron pulse series, this paper proposes a fast-correlation algorithm to improve the computational rate of the spectrum analysis system.And the multi-core processor technology is employed as well as multi-threaded programming techniques of LabVIEW to construct frequency spectrum analysis system of 252 Cf neutron source based on LabVIEW.It not only obtains the auto-correlation and cross correlation results, but also auto-power spectrum,cross-power spectrum and ratio of spectral density.The results show that:analysis tools based on LabVIEW improve the fast auto-correlation and cross correlation code operating efficiency about by 25% to 35%, also verify the feasibility of using LabVIEW for spectrum analysis.%从252 Cf中子源频谱测量系统的基本原理出发,针对中子脉冲序列本身"0,1"数据结构的特点,设计了自、互相关快速算法.采用LabVIEW多核处理器、多线程编程技术构建了基于LabVIEW的"52 Cf中子源频谱分析系统,不仅获得了自、互相关的快速计算结果,而且获得了自、互功率谱及谱密度比.研究结果表明:基于LabVIEW分析工具,既提升了自、互相关算法代码25%-35%的执行效率,又验证了LabVIEW用于进行频谱系统分析的可行性.

  16. 252Cf放射性同位素中子源辐照杀灭炭疽杆菌的理论研究%THEORY STUDY ON GERMICIDAL EFFICACY OF ANTHRAX SPORES BY RADIOISOTOPE Cf- 252 NEUTRON SOURCE

    Institute of Scientific and Technical Information of China (English)

    刘滨; 徐佳梁; 王凯; 胡文超

    2012-01-01

    目的 研究252Cf放射性同位素中子源辐照杀菌的可能性.方法 通过MCNP模拟计算方法,推算其所使用的模型,计算出252Cf中子辐射杀灭炭疽杆菌芽孢的辐照剂量和辐照时间.结果 经MCNP理论模拟研究,建立了MCNP模拟252Cf中子源产生的中子辐射消毒的模型,推演出使用石蜡作为反射材料可取得最好的结果.计算出用252Cf中子辐射杀灭炭疽杆菌芽孢的辐照剂量为1000 Gy,辐照时间为18 min.结论 利用252Cf中子辐射杀灭炭疽杆菌芽孢具有实际应用的可能性.%Objective To study the gerraicidal possibility of anthrax spores by radioisotope Cf - 252 neutron source. Method MCNP simulation calculation method was used to build the suitable model, calculate the radiation dose and radi-ation time required to sterilize the anthrax spores by the radioisotope Cf - 252 neutron source. Results The model was build to sterilize the anthrax spores by the radioisotope Cf - 252 neutron source. Simulation results showed that using paraffin as the reflecting materials in the model was the most effective in sterilization of the anthrax spores. The radiation dose calculated by the model was 1 000 Gy required to sterilize the anthrax spore by the radioisotope Cf - 252 neutron source, and the radiation time was about 18 min. Conclusion It is an effective and economic method to sterilize the anthrax spores by the radioisotope Cf - 252 neutron source in practical applications.

  17. What do comets 252P/LINEAR and P2016 BA14 have in common?

    Science.gov (United States)

    Rudawska, Regina; Vaubaillon, Jeremie; Tóth, Juraj; Raetz, Stefanie

    2016-10-01

    Automated surveys of NEOs continue to discover objects in cometary-like orbits that are likely candidate parent bodies [1]. Some of them unexpectedly produce a comet-like comae and tails [2, 3]. Here, we study one such case, namely asteroid 2016 BA14 recently discovered by the Pan-STARRS survey, which shows cometary appearance and has a Tisserand parameter of 2.8. Moreover, the orbital similarly between P/2016 BA14 and comet 252P/LINEAR was pointed. If those JFCs split in the past, significant dust would have been released. We present a survey of results dealing with investigating the association of comets P/2016 BA14 and 252P/LINEAR with meteor showers observed on Earth. We carry out a further search to investigate the possible genetic relationship between the comets themselves too. To confirm the reality of the relation between a comet and a meteoroid stream it is necessary to investigate the evolution of their orbits. The model of generation and evolution of meteoroid stream in the solar system is taken from Vaubaillon et al. [4]. The ejections of meteoroids from the possible parent body surface took place when it was passing its perihelion between 1700 A.D. and 2016 A.D. Next, the orbits of ejected meteoroids were integrated to year 2079. We will show the similarities and differences of the two streams, and will conclude regarding the possible relationship between P/2016 BA14 and 252P/LINEAR.[1] Jenniskens, P., Meteor Showers and their Parent Comets (Cambridge University Press), 2006[2] Jewitt, D., AJ, 143, 66, 2012[3] Jewitt, D. and Li, J., AJ, 140, 1519, 2010[4] Vaubaillon, J., Colas, F. Jorda, L., A&A, 439, 751, 2005

  18. Characterization of Comet 252P/LINEAR during its 2016 Earth Encounter

    Science.gov (United States)

    Li, Jian-Yang; Samarasinha, Nalin H.; Kelley, Michael S.; Farnocchia, Davide; Mutchler, Maximilian J.

    2016-10-01

    Comet 252P/LINEAR had a close encounter to Earth at 14 lunar distances in March 2016, representing one of the closest encounters of known comets in history and a good opportunity to measure its nucleus size and to resolve its inner coma. Observations from previous apparitions suggested a small nucleus of about or less than 1 km, and very weak activity for this comet. The similarity between the orbits of 252P and P/2016 BA16 suggests that they might be a pair of fragments from one common parent comet. We imaged 252P with the Hubble Space Telescope Wide Field Camera 3 through r'- and V-band filters over ~45 min on March 14 and over ~8 hours on April 4, 2016 at pixel scales down to 1.4 km/pix. The dust coma shows a strong enhancement in the sunward direction within about 1".5 (about 100 km at the comet) for both epochs. Image enhancement with 1/rho normalization shows that the sunward feature moves about the nucleus for ~60 deg in the second epoch, consistent with a ~7.35-hr period. The r'-band partial lightcurve measured in the April 4 images in a 0".2-radius aperture shows variability of about 0.14 mag or larger. This partial lightcurve is not consistent with the 7.35-hr period, but is consistent with a periodicity of ~5.5 hr or its multiples. The r'-band mean value of Afrho is 13 cm for March 14 and 46 cm for April 4 in a 0".2-radius aperture. We will also measure the nucleus size of this comet, and discuss its implications about the evolutionary state of the comet.

  19. Observation of a New (25/2+) Isomer in 121Sb

    Science.gov (United States)

    Kownacki, J.; Kisielinski, M.; Kowalczyk, M.; Droste, Ch.; Morek, T.; Ruchowska, E.; Srebrny, J.; Wolinska-Cichocka, M.; Palacz, M.; Korman, A.; Andrzejewski, J.; KrXf3l, A.; Perkowski, J.; Lieder, R.; Mierzejewski, J.; Sankowska, I.

    2008-02-01

    The beam pulse structure of the HIL cyclotron and thick target gamma -gamma coincidence measurements in the in-beam and off-beam modes have been used to search for isomers in the A approx 120 mass region using heavy-ion reactions. The half-life of the 2721 keV, (25/2+) level in 121Sb was determined in the off-beam mode to be 167 pm 19 mu s. Two deexcitation sequences of this isomer are proposed. The isomeric state is considered to be of 3-quasiparticle nature pi (d5/2)nu (h11/22)10+.

  20. Prompt neutron fission spectrum mean energies for the fissile nuclides and /sup 252/Cf

    Energy Technology Data Exchange (ETDEWEB)

    Holden, N.E.

    1985-01-01

    The international standard for a neutron spectrum is that produced from the spontaneous fission of /sup 252/Cf, while the thermal neutron induced fission neutron spectra for the four fissile nuclides, /sup 233/U, /sup 235/U, /sup 239/Pu, and /sup 241/Pu are of interest from the standpoint of nuclear reactors. The average neutron energies of these spectra are tabulated. The individual measurements are recorded with the neutron energy range measured, the method of detection as well as the average neutron energy for each author. Also tabulated are the measurements of the ratio of mean energies for pairs of fission neutron spectra. 75 refs., 9 tabs. (LEW)

  1. Role of energy cost in the yield of cold ternary fission of 252Cf

    Indian Academy of Sciences (India)

    P V Kunhikrishnan; K P Santhosh

    2013-01-01

    The energy costs in the cold ternary fission of 252Cf for various light charged particle emission are calculated by includingWong's correction for Coulomb potential. Energy cost is found to be higher in cold fission than in normal fission. It is found that energy cost always increases with decrease in experimental yield in all the light charged particle emissions. The higher ground state deformation of the fragments, the odd–even effect and the enhanced yield in the octupole region observed in cold fission are found to be consistent with the concept of energy cost.

  2. Measurement of 235U Fission Yield Induced by 252Cf Fission Neutron

    Institute of Scientific and Technical Information of China (English)

    YANG; Yi; LIU; Shi-long; JIANG; Wen-gang

    2015-01-01

    We measured fission yields of 235U by 252Cf fission neutrons with the directγray spectrometric method.Square sample foils of 15 mm,abundance of 235U is 90.2%,mass of 0.7gram,covered by pure aluminum foil.After irradiations every sample was measured by HPGe spectrometry for about 2months.Based on 140Ba’s fission yield,we get relative fission yields and the results were shown in Fig.1.

  3. {sup 252}Cf plasma desorption and laser desorption mass spectrometry for the determination of molecular weight distribution of coal derivatives

    Energy Technology Data Exchange (ETDEWEB)

    Johnson, B.R.; Bartle, K.D.; Ross, A.B.; Herod, A.A.; Kandiyoti, R.; Larsen, J.W. [University of Leeds, Leeds (United Kingdom). School of Chemistry

    1999-11-01

    A detailed knowledge of the molecular mass (MM) distribution in coal and its derived products is essential for a fundamental understanding of coal structure, and of the processes occurring during coal conversion. Fractionation using size exclusion chromatography (s.e.c.) using N-methyl-2-pyrrolidinone as the mobile phase has been applied to such materials and has provided improved MM distributions. Absolute calibration has been provided using matrix assisted laser desorption ionisation mass spectrometry (MAl.d.I.-m.s.). An alternative method of volatilising and ionising large molecules for mass spectrometry (m.s.) is {sup 252}Cf plasma desorption ({sup 252}Cf p.d.-m.s.). This involves the use of energetic fission fragments from the decay of {sup 252}Cf and produces mass spectra consisting predominantly of molecular ions from a range of polymers and biomolecules. This has been used by other workers to determine the molecular weight distribution of heavy distillation residues obtained from coal liquefaction processes either unfractionated or fractionated into broad fractions. Generally, a good agreement was obtained between values of MM determined by {sup 252}Cf p.d.-m.s. and s.e.c. A comparison is reported of MM distribution determined by {sup 252}Cf p.d.-m.s. and laser desorption mass spectrometry (l.d.-m.s.) for narrower fractions separated by s.e.c. from a coal tar pitch. 19 refs., 4 figs., 1 tab.

  4. Young stellar population and ongoing star formation in the HII complex Sh2-252

    CERN Document Server

    Jose, Jessy; Samal, M R; Ojha, D K; Ogura, K; Kim, J S; Kobayashi, N; Goyal, A; Chauhan, N; Eswaraiah, C

    2013-01-01

    In this paper an extensive survey of the star forming complex Sh2-252 has been undertaken with an aim to explore its hidden young stellar population as well as to understand the structure and star formation history. This complex is composed of five embedded clusters associated with the sub-regions A, C, E, NGC 2175s and Teu 136. Using 2MASS-NIR and Spitzer-IRAC, MIPS photometry we identified 577 young stellar objects (YSOs), of which, 163 are Class I, 400 are Class II and 14 are transition disk YSOs. Spatial distribution of the candidate YSOs shows that they are mostly clustered around the sub-regions in the western half of the complex, suggesting enhanced star formation activity towards its west. Using the spectral energy distribution and optical colour-magnitude diagram based age analyses, we derived probable evolutionary status of the sub-regions of Sh2-252. Our analysis shows that the region A is the youngest (~ 0.5 Myr), the regions B, C and E are of similar evolutionary stage (~ 1-2 Myr) and the cluster...

  5. Half-lives of several states in isotopes produced in the SF of ^252Cf

    Science.gov (United States)

    Hwang, J. K.; Ramayya, A. V.; Hamilton, J. H.; Fong, D.; Beyer, C. J.; Gore, P. M.; Jones, E. F.; Teran, E.; Oberacker, V. E.; Umar, A. S.; Luo, Y. X.; Rasmussen, J. O.; Zhu, S. J.; Wu, S. C.; Lee, I. Y.; Fallon, P.; Stoyer, M. A.; Asztalos, S. J.; Ginter, T. N.; Cole, J. D.; Ter-Akopian, G. M.; Donangelo, R.

    2003-10-01

    Half-lives (T_1/2) of 15 states in isotopes produced in the SF of ^252Cf have been determined using a new technique. The ^252Cf source was placed inside the Gammasphere, and triple and higher fold coincidence events were recorded. The half-lives and quadrupole deformations of ^104Zr, ^152Ce, and ^158Sm are determined for the first time. Except for ^102Sr, ^104Zr(β_2=0.45(4)) and ^158Sm(β_2=0.46(5)) are the most deformed among medium and heavy nuclei. Large deformation could have its origin in the high spin down-sloping orbitals near Z=38,40,62 and N=40,64,96. These large prolate deformations at ^104Zr and ^158Sm are confirmed by Hartree-Fock-Bogoliubov calculations carried out in the present work. Further, an excited rotational band including seven new γ transitions in ^97Sr was also identified. The band head energy of the 829.8 keV state in ^97Sr has an half-life of 265(27) nsec.

  6. Neutron dose rate for {sup 252} Cf AT source in medical applications

    Energy Technology Data Exchange (ETDEWEB)

    Paredes, L.; Balcazar, M. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico); Azorin, J. [UAM-I, 09340 Mexico D.F. (Mexico); Francois, J.L. [FI-UNAM, 04510 Mexico D.F. (Mexico)

    2006-07-01

    The AAPM TG-43 modified protocol was used for the calculation of the neutron dose rate of {sup 252}Cf sources for two tissue substitute materials, five normal tissues and six tumours. The {sup 252}Cf AT source model was simulated using the Monte Carlo MCNPX code in spherical geometry for the following factors: a) neutron air kerma strength conversion factor, b) dose rate constant, c) radial dose function, d) geometry factor, e) anisotropy function and f) neutron dose rate. The calculated dose rate in water at 1 cm and 90 degrees from the source long axis, using the Watt fission spectrum, was D{sub n}(r{sub 0}, {theta}{sub 0})= 1.9160 cGy/h-{mu}g. When this value is compared with Rivard et al. calculation using MCNP4B code, 1.8730 cGy/h-{mu}g, a difference of 2.30% is obtained. The results for the reference neutron dose rate in other media show how small variations in the elemental composition between the tissues and malignant tumours, produce variations in the neutron dose rate up to 12.25%. (Author)

  7. Multi-modal fission in collinear ternary cluster decay of 252Cf(sf, fff

    Directory of Open Access Journals (Sweden)

    W. von Oertzen

    2015-06-01

    Full Text Available We discuss the multiple decay modes of collinear fission in 252Cf(sf, fff, with three fragments as suggested by the potential energy surface (PES. Fission as a statistical decay is governed by the phase space of the different decay channels, which are suggested in the PES-landscape. The population of the fission modes is determined by the minima in the PES at the scission points and on the internal potential barriers. The ternary collinear decay proceeds as a sequential process, in two steps. The originally observed ternary decay of 252Cf(sf into three different masses (e.g. 132–140Sn, 52–48Ca, 68–72Ni, observed by the FOBOS group in the FLNR (Flerov Laboratory for Nuclear Reactions of the JINR (Dubna the collinear cluster tripartition (CCT, is one of the ternary fission modes. This kind of “true ternary fission” of heavy nuclei has often been predicted in theoretical works during the last decades. In the present note we discuss different ternary fission modes in the same system. The PES shows pronounced minima, which correspond to several modes of ternary fragmentations. These decays have very similar dynamical features as the previously observed CCT-decays. The data obtained in the experiments on CCT allow us to extract the yields for different decay modes using specific gates on the measured parameters, and to establish multiple modes of the ternary fission decay.

  8. GEANT4 and PHITS simulations of the shielding of neutrons from $^{252}$Cf source

    CERN Document Server

    Shin, Jae Won

    2014-01-01

    Neutron shielding simulations by using GEANT4 and PHITS code are performed. As a neutron source, $^{252}$Cf is considered and the energy distribution of the neutrons emitted from $^{252}$Cf is assumed the Watt fission spectrum. The neutron dose equivalent rates with and without the shield are estimated for shielding materials such as graphite, iron, polyethylene, NS-4-FR and KRAFTON-HB. For the neutron shielding simulations by using GEANT4, high precision (G4HP) model with G4NDL 4.2 based on ENDF-VII data are used. And for PHITS simulations, JENDL-4.0 library are used for the same purpose. It is found that differences between the shielding calculations by using GEANT4 with G4NDL 4.2 and PHITS with JENDL-4.0 library are not significant for all cases considered in this work. We investigate the accuracy of the neutron dose equivalent rates obtained from GEANT4 and PHITS by comparing our simulation results with experimental data and other values calculated earlier. Calculated neutron dose equivalent rates agree w...

  9. On the use of a ({sup 252}Cf-{sup 3}He) assembly for landmine detection by the neutron back-scattering method

    Energy Technology Data Exchange (ETDEWEB)

    Elsheikh, N., E-mail: nassreldeen.elsheikh@yahoo.com [College of Applied and Industrial Science, Department of Physics, University of Juba, Khartoum, P.O. Box 12327/1 (Sudan); Viesti, G. [Dipartimento di Fisica ed Astronomia dell' Universita di Padova, Via Marzolo 8, I-35131 Padova (Italy); ElAgib, I. [College of Science, King Saud University, P.O. Box 2455 (Saudi Arabia); Habbani, F. [Faculty of Science, Physics Department, University of Khartoum, Khartoum, P.O. Box 321 (Sudan)

    2012-04-15

    Experiments were carried out to optimize the performance of the neutron back-scattering (NBS) technique in landmine detection using an assembly consisting of three different layers placed above a {sup 252}Cf neuron source, producing about 10{sup 4} s{sup -1}, in conjunction with a {sup 3}He detector. The assembly was optimized experimentally. The selected assembly configuration was then examined against different {sup 252}Cf stand-off distances and mine burial depths using dummy landmines. Furthermore, Monte Carlo simulations were performed to study the effect of the shield when a {sup 252}Cf source in the range 10{sup 4}-10{sup 7} s{sup -1} was employed, and to optimize the geometry for future prototypes. - Highlights: Black-Right-Pointing-Pointer A suitable shielded ({sup 252}Cf-{sup 3}He) assembly for landmine detection was developed. Black-Right-Pointing-Pointer Experimental tests and MCNP simulations were performed for a {sup 252}Cf of (10{sup 4}-10{sup 7})s{sup -1}. Black-Right-Pointing-Pointer Experimental and MCNP results for {sup 252}Cf of 10{sup 4}s{sup -1} supports the use of the shield. Black-Right-Pointing-Pointer MCNP Results recommends {sup 252}Cf of 10{sup 6}s{sup -1} for hand-held detection system. Black-Right-Pointing-Pointer MCNP Results recommends {sup 252}Cf of 10{sup 7}s{sup -1} for a robotic detection system.

  10. 47 CFR 51.807 - Arbitration and mediation of agreements by the Commission pursuant to section 252(e)(5) of the Act.

    Science.gov (United States)

    2010-10-01

    ... 47 Telecommunication 3 2010-10-01 2010-10-01 false Arbitration and mediation of agreements by the Commission pursuant to section 252(e)(5) of the Act. 51.807 Section 51.807 Telecommunication FEDERAL... Implementation of Section 252 of the Act § 51.807 Arbitration and mediation of agreements by the...

  11. 48 CFR 252.209-7004 - Subcontracting with firms that are owned or controlled by the government of a terrorist country.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Subcontracting with firms that are owned or controlled by the government of a terrorist country. 252.209-7004 Section 252.209-7004 Federal Acquisition Regulations System DEFENSE ACQUISITION REGULATIONS SYSTEM, DEPARTMENT OF DEFENSE CLAUSES AND FORMS SOLICITATION...

  12. Variability of stalagmite-inferred Indian monsoon precipitation over the past 252,000 y.

    Science.gov (United States)

    Cai, Yanjun; Fung, Inez Y; Edwards, R Lawrence; An, Zhisheng; Cheng, Hai; Lee, Jung-Eun; Tan, Liangcheng; Shen, Chuan-Chou; Wang, Xianfeng; Day, Jesse A; Zhou, Weijian; Kelly, Megan J; Chiang, John C H

    2015-03-10

    A speleothem δ(18)O record from Xiaobailong cave in southwest China characterizes changes in summer monsoon precipitation in Northeastern India, the Himalayan foothills, Bangladesh, and northern Indochina over the last 252 kyr. This record is dominated by 23-kyr precessional cycles punctuated by prominent millennial-scale oscillations that are synchronous with Heinrich events in the North Atlantic. It also shows clear glacial-interglacial variations that are consistent with marine and other terrestrial proxies but are different from the cave records in East China. Corroborated by isotope-enabled global circulation modeling, we hypothesize that this disparity reflects differing changes in atmospheric circulation and moisture trajectories associated with climate forcing as well as with associated topographic changes during glacial periods, in particular redistribution of air mass above the growing ice sheets and the exposure of the "land bridge" in the Maritime continents in the western equatorial Pacific.

  13. Beta decay of 252Cf on the way to scission from the exit point

    CERN Document Server

    Pomorski, K; Quentin, P

    2015-01-01

    Upon increasing significantly the nuclear elongation, the beta-decay energy grows. This paper investigates within a simple yet partly microscopic approach, the transition rate of the beta decay of the 252Cf nucleus on the way to scission from the exit point for a spontaneous fission process. A rather crude classical approximation is made for the corresponding damped collective motion assumed to be one dimensional. Given these assumptions, we only aim in this paper at providing the order of magnitudes of such a phenomenon. At each deformation the energy available for beta decay, is determined from such a dynamical treatment. Then, for a given elongation, transition rates for the allowed (Fermi) beta decay are calculated from pair correlated wave functions obtained within a macroscopic-microscopic approach and then integrated over the time corresponding to the whole descent from exit to scission. The results are presented as a function of the damping factor (inverse of the characteristic damping time) in use in...

  14. An algorithm for 252Cf-Source-Driven neutron signal denoising based on Compressive Sensing

    Institute of Scientific and Technical Information of China (English)

    李鹏程; 魏彪; 冯鹏; 何鹏; 米德伶

    2015-01-01

    As photoelectrically detected 252Cf-source-driven neutron signals always contain noise, a denoising algorithm is proposed based on compressive sensing for the noised neutron signal. In the algorithm, Empirical Mode Decomposition (EMD) is applied to decompose the noised neutron signal and then find out the noised Intrinsic Mode Function (IMF) automatically. Thus, we only need to use the basis pursuit denoising (BPDN) algorithm to denoise these IMFs. For this reason, the proposed algorithm can be called EMDCSDN (Empirical Mode Decomposition Compressive Sensing Denoising). In addition, five indicators are employed to evaluate the denoising effect. The results show that the EMDCSDN algorithm is more effective than the other denoising algorithms including BPDN. This study provides a new approach for signal denoising at the front-end.

  15. Biogeochemical characterization of MC252 oil:sand aggregates on a coastal headland beach.

    Science.gov (United States)

    Urbano, Marilany; Elango, Vijaikrishnah; Pardue, John H

    2013-12-15

    MC252 oil:sand aggregates, termed surface residue balls (SRBs), were sampled for physical, chemical and microbial characteristics from different tidal zones on a coastal headland beach in Louisiana, USA. Supratidal SRBs were smaller, had low moisture content, and salinities that were <2 ppt. Intertidal SRBs were hypersaline and had higher N and sulfate concentrations, consistent with regular tidal inundation. Crude oil components were highest in the intertidal "oil mat" SRBs with C1- and C2-phenanthrenes, C2- and C3-dibenzothiophenes comprising the majority of the PAH concentrations. In the other SRB categories, PAHs and alkanes were depleted and profiles were skewed toward higher molecular weight compounds. Oxygen microelectrode measurements demonstrated that saturated O2 is present immediately after wetting, but O2 consumption in the interior of the aggregate occurs after a few days. Microbial populations varied with position on the beach but sequences similar to known PAH-degrading taxa (Mycobacterium sp. and Stenotrophomonas sp.) were observed.

  16. Characterization of core clinical phenotypes associated with recurrent proximal 15q25.2 microdeletions.

    Science.gov (United States)

    Burgess, Trent; Brown, Natasha J; Stark, Zornitza; Bruno, Damien L; Oertel, Ralph; Chong, Belinda; Calabro, Vanessa; Kornberg, Andrew; Sanderson, Christine; Kelly, Julian; Howell, Katherine B; Savarirayan, Ravi; Hinds, Rupert; Greenway, Anthea; Slater, Howard R; White, Susan M

    2014-01-01

    A recurrent proximal microdeletion at 15q25.2 with an approximate 1.5 megabase smallest region of overlap has recently been reported in seven patients and is proposed to be associated with congenital diaphragmatic hernia (CDH), mild to moderate cognitive deficit, and/or features consistent with Diamond-Blackfan anemia. We report on four further patients and define the core phenotypic features of individuals with this microdeletion to include mild to moderate developmental delay or intellectual disability, postnatal short stature, anemia, and cryptorchidism in males. CDH and structural organ malformations appear to be less frequent associations, as is venous thrombosis. There is no consistent facial dysmorphism. Features novel to our patient group include dextrocardia, obstructive sleep apnea, and cleft lip.

  17. Molecular Collective Vibrations in the Ternary Neutronless Fission of $^{252}Cf$

    CERN Document Server

    Misicu, S; Sandulescu, A; Greiner, W

    1999-01-01

    Based on a recent experimental finding which may suggest the existence of a tri-nuclear molecular structure before the cold ternary fragmentation of $^{252}$Cf takes place, we solved the eigenvalue problem of a certain class of vibrations which are very likely to occur in these molecules. These oscillations are the result of the joined action of rotations of the heavier fragments and the transversal vibrations of the lighter spherical cluster with respect to the fission axis. In the calculation of the interaction between the heavier fragments we took into account higher multipole deformations, including the hexadecupole one, and introduced a repulsive nuclear part to insure the creation of a potential pocket in which a few molecular states can be accommodated. The possibility to observe the de-excitation of such states is discussed in connection with the molecular life-time.

  18. A physics investigation of deadtime losses in neutron counting at low rates with Cf252

    Energy Technology Data Exchange (ETDEWEB)

    Evans, Louise G [Los Alamos National Laboratory; Croft, Stephen [CANBERRA INDUSTRIES, INC.

    2009-01-01

    {sup 252}Cf spontaneous fission sources are used for the characterization of neutron counters and the determination of calibration parameters; including both neutron coincidence counting (NCC) and neutron multiplicity deadtime (DT) parameters. Even at low event rates, temporally-correlated neutron counting using {sup 252}Cf suffers a deadtime effect. Meaning that in contrast to counting a random neutron source (e.g. AmLi to a close approximation), DT losses do not vanish in the low rate limit. This is because neutrons are emitted from spontaneous fission events in time-correlated 'bursts', and are detected over a short period commensurate with their lifetime in the detector (characterized by the system die-away time, {tau}). Thus, even when detected neutron events from different spontaneous fissions are unlikely to overlap in time, neutron events within the detected 'burst' are subject to intrinsic DT losses. Intrinsic DT losses for dilute Pu will be lower since the multiplicity distribution is softer, but real items also experience self-multiplication which can increase the 'size' of the bursts. Traditional NCC DT correction methods do not include the intrinsic (within burst) losses. We have proposed new forms of the traditional NCC Singles and Doubles DT correction factors. In this work, we apply Monte Carlo neutron pulse train analysis to investigate the functional form of the deadtime correction factors for an updating deadtime. Modeling is based on a high efficiency {sup 3}He neutron counter with short die-away time, representing an ideal {sup 3}He based detection system. The physics of dead time losses at low rates is explored and presented. It is observed that new forms are applicable and offer more accurate correction than the traditional forms.

  19. 48 CFR 252.236-7011 - Overseas architect-engineer services-Restriction to United States firms.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Overseas architect... SOLICITATION PROVISIONS AND CONTRACT CLAUSES Text of Provisions And Clauses 252.236-7011 Overseas architect... provision: Overseas Architect-Engineer Services—Restriction to United States Firms (JAN 1997) (a)...

  20. 75 FR 51943 - Safety Zone; DEEPWATER HORIZON at Mississippi Canyon 252 Outer Continental Shelf MODU in the Gulf...

    Science.gov (United States)

    2010-08-24

    ... SECURITY Coast Guard 33 CFR Part 147 RIN 1625-AA00 Safety Zone; DEEPWATER HORIZON at Mississippi Canyon 252... temporary safety zone around the riser for the DEEPWATER HORIZON, a Mobile Offshore Drilling Unit (MODU), at... zone around the riser for the DEEPWATER HORIZON, a Mobile Offshore Drilling Unit (MODU), which...

  1. 48 CFR 252.225-7007 - Prohibition on Acquisition of United States Munitions List Items from Communist Chinese Military...

    Science.gov (United States)

    2010-10-01

    ... Regulation in 22 CFR Part 121. (b) Any supplies or services covered by the United States Munitions List that... of United States Munitions List Items from Communist Chinese Military Companies. 252.225-7007 Section... Chinese Military Companies. As prescribed in 225.1103(4), use the following clause: Prohibition...

  2. 48 CFR 252.222-7001 - Right of first refusal of employment-Closure of military installations.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Right of first refusal of... SOLICITATION PROVISIONS AND CONTRACT CLAUSES Text of Provisions And Clauses 252.222-7001 Right of first refusal...: Right of First Refusal of Employment—Closure of Military Installations (APR 1992) (a) The...

  3. 48 CFR 252.227-7018 - Rights in noncommercial technical data and computer software-Small Business Innovation Research...

    Science.gov (United States)

    2010-10-01

    ... Clauses 252.227-7018 Rights in noncommercial technical data and computer software—Small Business... the Rights in Noncommercial Technical Data and Computer Software—Small Business Innovative Research... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Rights in...

  4. 48 CFR 252.247-7003 - Pass-Through of Motor Carrier Fuel Surcharge Adjustment To The Cost Bearer.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Pass-Through of Motor... SOLICITATION PROVISIONS AND CONTRACT CLAUSES Text of Provisions And Clauses 252.247-7003 Pass-Through of Motor...: PASS-THROUGH OF MOTOR CARRIER FUEL SURCHARGE ADJUSTMENT TO THE COST BEARER (SEP 2010) (a) This...

  5. 48 CFR 252.226-7001 - Utilization of Indian organizations, Indian-owned economic enterprises, and native Hawaiian small...

    Science.gov (United States)

    2010-10-01

    ... of a subcontract or by the failure to award a subcontract. Native Hawaiian small business concern... organizations, Indian-owned economic enterprises, and native Hawaiian small business concerns. 252.226-7001... Hawaiian small business concerns. As prescribed in 226.104, use the following clause: Utilization of...

  6. The sup 252 Cf-source-driven noise measurements of unreflected uranium hydride cylinder subcriticality

    Energy Technology Data Exchange (ETDEWEB)

    Mihalczo, J.T.; Pare, V.K.; Blakeman, E.D. (Oak Ridge National Lab., TN (United States))

    1991-01-01

    Subcritical neutron multiplication factors have been measured by the {sup 252}Cf-source-driven noise analysis method for unreflected, 15.0-cm-diam uranium hydride cylinders of varying heights. Because of the difficulty and cost of controlling the H/U ratio in damp uranium (93.2 wt% {sup 235}U) oxide power and fabricating sufficient material for experiments, few experiments have been performed with materials of low H/U ratios. These measurements may provide alternate information that can be used for verifying calculational methods since the H/U ratio for this material is 3.00. These measurements, which are the first application of this method to uranium hydride, were performed at the Los Alamos National Laboratory Critical Experiments Facility in 1989. These measurements were used to demonstrate the capability of this measurement method for this type of material and to provide a benchmark experiment for calculational methods with slightly moderated systems. Previous experiments by this method were for a wide variety of well-moderated systems or unmoderated uranium metal cylinders.

  7. Structures of the neutron-rich nuclei observed in fission of {sup 252}Cf

    Energy Technology Data Exchange (ETDEWEB)

    Ramayya, A. V.; Hamilton, J. H.; Goodin, C. J.; Brewer, N. T.; Hwang, J. K. [Department of Physics, Vanderbilt University, Nashville, Tennessee 37235 (United States); Luo, Y. X. [Department of Physics, Vanderbilt University, Nashville, Tennessee 37235 USA and Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Liu, S. H. [Department of Physics, Vanderbilt University, Nashville, Tennessee 37235 USA and UNRIB/Oak Ridge Associated Universities, Oak Ridge, Tennessee 37831 (United States); Rasmussen, J. O.; Lee, I. Y. [Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Stone, N. J. [Department of Physics, Oxford University, Oxford OX1 3PU (United Kingdom); Daniel, A. V. [Flerov Laboratory of Nuclear Reactions, JINR, Dubna (Russian Federation); Zhu, S. J. [Department of Physics, Tsinghua University, Beijing 100084 (China)

    2014-08-14

    Analysis of high statistics triple coincidence fission γ data from {sup 252}Cf at Gammasphere including angular correlations yielded well-expanded high-spin level schemes with more complete and reliable spin/parity assignments for {sup 82}Ge, {sup 118,120,122}Cd and {sup 114,115}Rh. Both the quasi-particle/hole couplings and quasi-rotational degrees of freedom are implied to play roles in these Cd isotopes. Evidence for triaxial shapes and octupole components in the Cd isotopes is presented. These Cd isotopes may have triaxial deformations. High-spin level schemes of {sup 114,115}Rh have been established for the first time. The existence of a relatively large signature splitting and an yrare band shows typical features of a triaxially deformed nucleus. Possible excited deformed rotational bands are observed, for the first time, in {sup 82}Ge. From the multipole mixing ratio measurement, the ground state configurations of {sup 109,111}Ru, as well as excited states in {sup 103,107}Mo and {sup 111}Ru were determined.

  8. Sensitivity of 252Cf(sf) Neutron Observables to FREYA Inputs

    Science.gov (United States)

    Vogt, Ramona; Randrup, Jorgen; Talou, Patrick

    2016-09-01

    Within the framework of the fission event generator FREYA , (Fission Reaction Event Yield Algorithm) we have studied the sensitivity of various neutron observables to the yield distribution Y (A , Z , TKE) used as input to the code. Concentrating on the spontaneous fission of 252Cf, we generate a large number of different input yield distributions by performing simultaneous variations in the mass and charge yields as well as the kinetic energy distribution, governed by yield covariance matrices established from experimental data sets. For each of these input yield distributions, we then use FREYA to generate a large sample of complete fission events from which we extract various neutron observables, in particular the neutron multiplicity distribution, and the neutron spectrum associated with each multiplicity. On this basis, we are able to determine the sensitivity of those observables to the uncertainties in the input yield distribution obtained experimentally. This kind of study can be applied to any other case of interest and the information obtained can help to establish any needs and target accuracies required for further measurements to ensure reliable data validation. The work of J.R. was performed under the auspices of the U.S. Dept. of Energy by Lawrence Berkeley National Laboratory under Contract DE-AC02-05CH11231. The work of P.T. was performed under the auspices of the National Nuclear Security Administration.

  9. Regional heat loss in resting man during immersion in 25.2 degrees C water.

    Science.gov (United States)

    Wade, C E; Dacanay, S; Smith, R M

    1979-06-01

    Five male subjects having a wide range of relative body fat, 9.2-20.2%, were studied during total body immersion in water at 25.2 degrees C. The regional surface area of each subject was calculated from anthropometric data utilizing a segmental geometric model. Skin temperatures (Tsk) and regional skin heat loss were measured prior to and during 30 min immersion at 13 sites. During immersion, mean Tsk was 25.9 degrees C and remained significantly higher than the water temperature. A measurable temperature gradient for heat flow was observed from all body segments. Segimental temperature in water ranged from 26.7-25.4 degrees C, being warmest at the neck and coolest at the foot. Heat the flow per regional area was highest in the neck, 187 W/m2, and least at the foot, 12 W/m2. Heat flow from each body region was dependent on regional Tsk. Skinfold thickness was a minor factor in altering regional heat flow in the foot, hand, lower arm, upper arm, thigh, and calf; in the torso, neck, and head regions it was of major importance in detering heat loss.

  10. Measurements in support of the Deepwater Horizon (MC-252) oil spill response

    Science.gov (United States)

    Crout, Richard L.

    2011-06-01

    The explosion of the Deepwater Horizon (MC-252) drilling platform on 20 April 2010 began a long response by the United Area Command. Previous responses to oil spills were limited in time due to the amount of oil spilled and were generally confined to the surface. Some of the oil from the Deepwater Horizon wellhead in 1500 meters of water broke into smaller droplets, whose density caused much of the oil to stay within a zone from 1000 to 1300 meters depth. The remainder of the oil rose to the surface. The two primary locations of oil required a broad collection of remote sensing techniques to locate and monitor the oil spill. Surface oil was monitored primarily from the air using aircraft and satellite assets. Satellite visible, infra-red, and radar satellite imagery helped to locate oil in the northern Gulf of Mexico and help predict its movement away from the spill site. Daily over-flights by aircraft provided higher spatial and temporal resolution data that were assimilated into daily products. These remote sensing assets were able to track the surface oil, but the subsurface oil required different techniques. In addition to salinity and temperature profiles to determine the subsurface structure, fluorometry and dissolved oxygen measurements provided information related to oil and its consumption by microorganisms. Water samples collected from CTD casts were analyzed on-board and returned to on-shore laboratories.

  11. Induction of external abnormalities in offspring of male mice irradiated with [sup 252]Cf neutron

    Energy Technology Data Exchange (ETDEWEB)

    Kurishita, Akihiro; Ono, Tetsuya; Mori, Yuriko (Tohoku University School of Medicine, Sendai (Japan). Department of Radiation Research); Okada, Shigefumi (Kyoto University (Japan). Radiation Biology Center); Sawada, Syozo (Hiroshima Univ. (Japan). Research Inst. for Nuclear Medicine and Biology)

    1992-08-01

    To assess the genetic effects of fission neutron, the induction of external malformations was studied in F[sub 1] fetuses after F[sub 0] male mice were irradiated. Male mice of the ICR:MCH strain were irradiated with [sup 252]Cf neutron at doses of 0.238, 0.475, 0.95 and 1.9 Gy. They were mated with non-irradiated female mice at 71-120 days after irradiation. Pregnant females were autopsied on day 18 of gestation and their fetuses were examined for deaths and external abnormalities. No increases of pre- and post-implantation losses were noted at any dose. External abnormalities were observed at rates of 1.40% in the 0.238 Gy, 2.23% in the 0.475 Gy, 3.36% in the 0.95 and 3.26% in the 1.9 Gy groups; the rate in the control group was 1.65%. The dose-response curve was linear up to 0.95 Gy, and then flattened out; the induction rate of external abnormalities was 2.7x10[sup -4]/gamete/cGy based on the linear regression. These results indicated that fission neutron effectively induces external abnormalities in F[sub 1] fetuses after spermatogonial irradiation. (author). 29 refs.; 1 fig.; 2 tabs.

  12. Neutron dosimetry for low dose rate Cf-252 AT sources and adherence to recent clinical dosimetry protocol for brachytherapy

    Energy Technology Data Exchange (ETDEWEB)

    Rivard, M.J.; Wierzbicki, J.G.; Van den Heuvel, F. [Wayne State Univ., Detroit, MI (United States). Dept. of Radiation Oncology; Martin, R.C. [Oak Ridge National Lab., TN (United States). Chemical Technology Div.

    1997-12-01

    In 1995, the American Association of Physicists in Medicine Task Group 43 (AAPM TG-43) published a protocol obsoleting all mixed-field radiation dosimetry for Cf-252. Recommendations for a new brachytherapy dosimetry formalism made by this Task Group favor quantification of source strength in terms of air kerma rather than apparent Curies or other radiation units. Additionally, representation of this dosimetry data in terms of radial dose functions, anisotropy functions, geometric factors, and dose rate constants are in an angular and radial (spherical) coordinate system as recommended, rather than the along-away dosimetry data (Cartesian coordinate system) currently available. This paper presents the initial results of calculated neutron dosimetry in a water phantom for a Cf-252 applicator tube (AT) type medical source soon available from Oak Ridge National Laboratory (ORNL).

  13. Radioactive Beams from 252CF Fission Using a Gas Catcher and an ECR Charge Breeder at ATLAS

    CERN Document Server

    Pardo, Richard C; Hecht, Adam; Moore, Eugene F; Savard, Guy

    2005-01-01

    An upgrade to the radioactive beam capability of the ATLAS facility has been proposed using 252Cf fission fragments thermalized and collected into a low-energy particle beam using a helium gas catcher. In order to reaccelerate these beams an existing ATLAS ECR ion source will be reconfigured as a charge breeder source. A 1Ci 252Cf source is expected to provide sufficient yield to deliver beams of up to ~106 far from stability ions per second on target. A facility description, the expected performance and the expected performance will be presented in this paper. This work is supported by the U.S. Department of Energy, Office of Nuclear Physics, under contract W-31-109-ENG-38.

  14. Biodegradation of MC252 oil in oil:sand aggregates in a coastal headland beach environment

    Directory of Open Access Journals (Sweden)

    Vijaikrishnah eElango

    2014-04-01

    Full Text Available Biodegradation potential of MC252 in oil:sand aggregates, termed surface residue balls (SRBs, was examined using multiple lines of evidence on a heavily-impacted coastal headland beach in Louisiana, USA. SRBs were sampled over a 16-month period on the supratidal beach environment where reasonable control existed on the residence time of the aggregates on the beach surface. PAH and alkane concentration ratios were measured including PAH/C30-hopane, C2/C3 phenanthrenes, C2/C3 dibenzothiophenes and alkane/C30-hopane and demonstrated unequivocally that biodegradation was occurring in SRBs in the supratidal. These biodegradation reactions occurred over time frames relevant to the coastal processes moving SRBs off the beach. In contrast, submerged oil mat (SOM samples did not demonstrate chemical changes consistent with biodegradation. Review and analysis of additional biogeochemical parameters suggested the existence of a moisture and N-limited biodegradation regime on the supratidal beach environment. At this location, SRBs possess moisture contents < 2% and molar C:N ratios from 131-323, well outside of optimal values for biodegradation in the literature. Despite these limitations, biodegradation of PAHs and alkanes proceeded at relevant rates (2-8 year-1 due in part to the presence of degrading populations, i.e., Mycobacterium sp., adapted to these conditions. For SOM samples in the intertidal, an oxygen and salinity-impacted regime is proposed that severely limits biodegradation of alkanes and PAHs in this environment. These results support the hypothesis that SRBs deposited at different locations on the beach have different biogeochemical characteristics (e.g., moisture; salinity; terminal electron acceptors; nutrient; and oil composition due, in part, to their location on the landscape.

  15. Biodegradation of MC252 oil in oil:sand aggregates in a coastal headland beach environment.

    Science.gov (United States)

    Elango, Vijaikrishnah; Urbano, Marilany; Lemelle, Kendall R; Pardue, John H

    2014-01-01

    Unique oil:sand aggregates, termed surface residue balls (SRBs), were formed on coastal headland beaches along the northern Gulf of Mexico as emulsified MC252 crude oil mixed with sand following the Deepwater Horizon spill event. The objective of this study is to assess the biodegradation potential of crude oil components in these aggregates using multiple lines of evidence on a heavily-impacted coastal headland beach in Louisiana, USA. SRBs were sampled over a 19-month period on the supratidal beach environment with reasonable control over and knowledge of the residence time of the aggregates on the beach surface. Polycyclic aromatic hydrocarbons (PAHs) and alkane concentration ratios were measured including PAH/C30-hopane, C2/C3 phenanthrenes, C2/C3 dibenzothiophenes and alkane/C30-hopane and demonstrated that biodegradation was occurring in SRBs in the supratidal. These biodegradation reactions occurred over time frames relevant to the coastal processes moving SRBs off the beach. In contrast, submerged oil mat samples from the intertidal did not demonstrate chemical changes consistent with biodegradation. Review and analysis of additional biogeochemical parameters suggested the existence of a moisture and nutrient-limited biodegradation regime on the supratidal beach environment. At this location, SRBs possess moisture contents biodegradation in the literature. Despite these limitations, biodegradation of PAHs and alkanes proceeded at relevant rates (2-8 year(-1)) due in part to the presence of degrading populations, i.e., Mycobacterium sp., adapted to these conditions. For submerged oil mat samples in the intertidal, an oxygen and salinity-impacted regime is proposed that severely limits biodegradation of alkanes and PAHs in this environment. These results support the hypothesis that SRBs deposited at different locations on the beach have different biogeochemical characteristics (e.g., moisture, salinity, terminal electron acceptors, nutrient, and oil

  16. Clinical observation of external irradiation combined with 252Cf brachytherapy on advanced cardiac carcinoma%外照射加252Cf中子腔内治疗中晚期贲门癌临床观察

    Institute of Scientific and Technical Information of China (English)

    古力米拉木·艾热提; 阿依古丽·依布拉音; 杨杰; 热伊拉·买买提伊民

    2014-01-01

    目的 观察外照射结合252Cf中子腔内治疗中晚期贲门癌患者近期疗效及不良反应.方法 收集2005年3月至2010年12月间收治的48例均经病理检查证实的贲门癌患者,其中腺癌39例,鳞状细胞癌5例,印戒细胞癌4例.全部患者Karnofsky评分≥80分,无远处转移,均为首程放疗,放疗采用体外照射结合腔内治疗.体外照射:采用6 MV-X线直线加速器治疗,2 Gy/次,5次/周,总剂量38~45 Gy.腔内照射:采用ZH-1000型252Cf中子后装治疗机治疗,参考点为:距离放射源中心10 mm,照射范围:病灶上端各延长1~2 cm,3.5~4.0 Gy/次,1次/周,共3~4次,总剂量12~16 Gy.结果 进食哽噎症状明显改善,Ⅰ级18例,Ⅱ级26例,Ⅲ级4例;近期疗效评价有效率(CR+PR) 91.7%(44/48);生存率1年以上者39.6%,2年以上者6.3%;25例(52.1%)患者出现恶心、呕吐、食欲不佳等不良反应,骨髓抑制:Ⅰ级21例(43.8%),Ⅱ级3例(6.3%).结论 体外照射结合252Cf中子治疗为中晚期贲门癌患者提供了一种新的安全可靠且无痛苦的有效治疗方法.%Objective To observe the efficacy and the toxicity of external irradiation combined with 252Cf brachytherapy on advanced cardiac carcinoma.Methods 48 patients with advanced cardiac carcinoma hospitalized during March 2007 to December 2010 were recruited,in which 39 cases were adenocarcinoma,5 patients were squamous carcinoma and 4 cases were signet-ring cell carcinoma.All cases had a Kamofsky above 80,no metastasis and received radiotherapy sequenced external and internal irradiation.The external irradiation was conducted under a 6MV X linear accelerator,and a dose of 38-45 Gy (2 Gy/22 f).The type ZH-1000 252Cf neutron breach-loading machine was used for brachytherapy with a dose of 12-16 Gy.Results Dysphagia cleared in all cases.The short-term efficacy (PR+CR) rate was 91.7 % (44/48).One and two year survival rate were,respectively,39.6 % and 6.3 %.25 (52.1%) patients had

  17. LW15-252型断路器气动回路的改进研究与实施%Improvement of Pneumatic Circuit for LW15-252 Circuit Breaker

    Institute of Scientific and Technical Information of China (English)

    郭夫; 贾明月; 刘树新; 蒋晓刚

    2011-01-01

    笔者介绍了一种关于LW15-252型断路器气动回路改进方案.在分析气动回路组成及运行原理基础上,详细研究了进口电磁阀、气水分离器结构及动作原理,改进设计了电磁阀活塞和气水分离器滤芯,解决电磁阀活塞容易断裂和气水分离器因锈蚀影响正常工作的问题.从根本上解决了气动回路故障频发的难题,提高了该型断路器稳定运行水平,同时打破了国外技术垄断,也为改造同类断路器提供了借鉴.%This paper introduced an improvement scheme for the pneumatic circuit of the LW15-252 circuit breaker. By analyzing the composition and running principle of the apneumatic circuit, we investigated the basic structures and action principles of the inlet solenoid valve and moisture separator, redesigned the piston of the valve and the filter element of the moisture separator to preven the piston from break and the moisture separator from corrosion. Thus, the frequent failures of the pneumatic circuit disappeared, and the level of stable operation of the LW15-252 circuit breaker was greatly improved. In addition, this study has broken the monopolization of the foreign technology in China, and provides a good reference for updating the similar breakers with pneumatic mechanism.

  18. The Influence of K252a on Drug Resistance of Neuroblastoma that Expresses TrkB%K252a对表达TrkB的NB细胞耐药性的影响

    Institute of Scientific and Technical Information of China (English)

    张继红; 李爱敏; 滕绍春; 张可仞; 张锦华

    2005-01-01

    目的:使用全反式维甲酸(ATRA)诱导SH-SY5Y NB(SY5Y)细胞的TrkB表达,加入BDNF激活TrkB/BDNF信号传导通路使TrkB磷酸化,然后用特异性酪氨酸激酶抑制剂K252a阻断该通路,观察NB细胞对化疗药物-顺铂(CDDP)敏感性的变化.方法:用ATRA诱导SY5Y细胞的TrkB高表达后,用BDNF、CDDP和TrkB信号传导通路的特异性阻断剂-K252a处理,MTT法检测细胞的存活率变化;流式细胞技术(FCM)检测细胞凋亡率;应用免疫组化法检测细胞磷酸化TrkB(p-TrkB)的表达水平.结果:ATRA能特异性诱导TrkB的表达,加入BDNF后可激活TrkB/BDNF信号传导通路并能引起TrkB的自动磷酸化;K252a能够阻断TrkB的磷酸化和TrkB/BDNF信号传导通路;经CDDP处理的SY5Y细胞的存活率下降、凋亡率上升.结论:阻断TrkB/BDNF信号传导通路可提高共表达TrkB/BDNF的NB细胞的化疗敏感性.因此,应用TrkB的抑制剂治疗NB有望提高该病的临床治愈率.

  19. 252例儿童急性化脓性中耳炎菌群分布及药敏结果%Discussion of 252 pediatric cases of acute otitis media and appropriate treatment

    Institute of Scientific and Technical Information of China (English)

    马天宝; 韩光辉; 刘燕

    2006-01-01

    目的分析儿童急性化脓性中耳炎菌群分布及药敏结果,寻找有效的抗生素进行治疗.方法对252例0-1 2岁(252耳)经临床诊断为急性化脓性中耳炎患儿的耳道分泌物及鼓膜穿孔前期经鼓膜刺激取分泌物进行细菌培养,同时对培养阳性菌株的种类及药物敏感试验结果进行统计.结果252份分泌物共分离出病原菌260株,总阳性率为95.9%,8例检出2种菌株.其中G+球菌188株(占72.3%);G杆菌19株(占23.5%);真菌11株(占4.2%).结论;G+球菌是本地区儿童急性化脓性中耳炎的主要致病菌,对青霉素及红霉素均有较高的耐药性.提示,临床用药不能仅凭经验,而应根据细菌培养结果和药敏结果用药,以获得理想疗效,减少转化为慢性病程的可能.

  20. Replacing a 252Cf source with a neutron generator in a shuffler - a conceptual design performed with MCNPX

    Energy Technology Data Exchange (ETDEWEB)

    Schear, Melissa A [Los Alamos National Laboratory; Tobin, Stephen J [Los Alamos National Laboratory

    2009-01-01

    The {sup 252}Cf shuffler has been widely used in nuclear safeguards and radioactive waste management to assay fissile isotopes, such as {sup 235}U or {sup 239}Pu, present in a variety of samples, ranging from small cans of uranium waste to metal samples weighing several kilograms. Like other non-destructive assay instruments, the shuffler uses an interrogating neutron source to induce fissions in the sample. Although shufflers with {sup 252}Cf sources have been reliably used for several decades, replacing this isotopic source with a neutron generator presents some distinct advantages. Neutron generators can be run in a continuous or pulsed mode, and may be turned off, eliminating the need for shielding and a shuffling mechanism in the shuffler. There is also essentially no dose to personnel during installation, and no reliance on the availability of {sup 252}Cf. Despite these advantages, the more energetic neutrons emitted from the neutron generator (141 MeV for D-T generators) present some challenges for certain material types. For example when the enrichment of a uranium sample is unknown, the fission of {sup 238}U is generally undesirable. Since measuring uranium is one of the main uses of a shuffler, reducing the delayed neutron contribution from {sup 238}U is desirable. Hence, the shuffler hardware must be modified to accommodate a moderator configuration near the source to tailor the interrogating spectrum in a manner which promotes sub-threshold fissions (below 1 MeV) but avoids the over-moderation of the interrogating neutrons so as to avoid self-shielding. In this study, where there are many material and geometry combinations, the Monte Carlo N-Particle eXtended (MCNPX) transport code was used to model, design, and optimize the moderator configuration within the shuffler geometry. The code is then used to evaluate and compare the assay performances of both the modified shuffler and the current {sup 252}Cf shuffler designs for different test samples. The

  1. Detailed Study of the Angular Correlations in the Prompt Neutron Emission in Spontaneous Fission of 252Cf

    Science.gov (United States)

    Kopatch, Yu.; Chietera, A.; Stuttgé, L.; Gönnenwein, F.; Mutterer, M.; Gagarski, A.; Guseva, I.; Chernysheva, E.; Dorvaux, O.; Hambsch, F.-J.; Hanappe, F.; Mezentseva, Z.; Telezhnikov, S.

    An experiment has been performed at IPHC Strasbourg, aimed at the detailed investigation of angular correlations in the neutron emission from spontaneous fission of 252Cf. Fission fragments were measured by the angle-sensitive double ionization chamber CODIS while neutrons were detected by a set of 60 DEMON scintillator counters. The main aim of the experiment is the observation of the correlation between the fragment spins and neutron emission anisotropy. Preliminary results, based on the Monte-Carlo simulations, as well as the preliminary analysis of the experimental data are shown.

  2. OER by survival time for Cf-252, low dose rate Cs-137 and acute Co-60 for LSA lymphoma

    Energy Technology Data Exchange (ETDEWEB)

    Maruyama, Y.; Feola, J.M.; Magura, C.; Onomura, C.I.; Beach, J.L.

    1986-01-01

    RBE and OER were determined for LSA tumor by survival time assay. The RBE/sub n/ of Cf vs. Cs-137 was 5.8 and the OER was --1.4 by experiments performed in vitro and assayed in vivo. When tumor was irradiated in an advanced state in the living mouse, the RBE/sub n/ was determined to be 5.2 vs. Cs-137. The RBE for hypoxic tumor is larger than for the oxic tumor for Cf-252 neutron irradiation.

  3. Identification of new neutron-rich rare-earth nuclei produced in /sup 252/Cf spontaneous fission

    CERN Document Server

    Greenwood, R C; Gehrke, R J; Meikrantz, D H

    1981-01-01

    A program of systematic study of the decay properties of neutron-rich rare-earth nuclei with 30 s252/Cf spontaneous fission, is currently underway using the Idaho ESOL (Elemental Separation On Line) Facility. The chemistry system used for the rare-earth elemental separations consists of two high-performance chromatography columns connected in series and coupled to the /sup 252 /Cf fission source via a helium gas-jet transport arrangement. The time delay for separation and initiation of gamma -ray counting with results which have been obtained to date with this system include the identification of a number of new neutron-rich rare-earth isotopes including /sup 155/Pm (t/sub 1/2/=48+or-4 s) and /sup 163/Gd (t/sub 1 /2/=68+or-3 s), in addition to 5.51 min /sup 158/Sm which was identified in an earlier series of experiments. (11 refs).

  4. The emission probabilities of long range alpha particles from even-even 244-252Cm isotopes

    CERN Document Server

    Santhosh, K P; Priyanka, B

    2014-01-01

    The alpha accompanied cold ternary fission of even-even 244Cm, 246Cm, 248Cm, 250Cm and 252Cm isotopes have been studied by taking the interacting barrier as the sum of Coulomb and proximity potential with the fragments in equatorial configuration. The favorable fragment combinations are obtained from the cold reaction valley plot and by calculating the relative yield for the charge minimized fragments. In the alpha accompanied ternary fission of 244Cm isotope, the highest yield is found for the fragment combination 110Ru+4He+130Sn, which possess near doubly magic nuclei 130Sn. For the ternary fission of 246Cm, 248Cm, 250Cm and 252Cm isotopes with 4He as light charged particle, the highest yield is obtained for the fragment combination with doubly magic nuclei 132Sn as the heavier fragment. The emission probabilities and kinetic energies of long range alpha particle have been computed for the 242,244,246,248Cm isotopes and are found to be in good agreement with the experimental data. The relative yields for th...

  5. RECONCEPTUALIZAREA INCRIMINĂRII TORTURII, TRATAMENTULUI INUMAN SAU DEGRADANT PRIN LEGEA NR.252 DIN 08.11.2012

    Directory of Open Access Journals (Sweden)

    Ursu Daniela

    2016-11-01

    Full Text Available Prezentul studiu este destinat identificării raţiunilor legiuitorului Republicii Moldova de a incrimina cu titlu de nomen iuris faptele de tortură, tratament inuman sau degradant în Capitolul III al Părţii Speciale a Codului penal – „Infracţiuni contra libertăţii, cinstei şi demnităţii persoanei”. Această preocupare este dictată îndeosebi de diferenţele care se impun, în latura amplasării într-un anumit capitol, între actualul model incriminator în materie şi cel care în vigoare până la in­tervenţia Legii Republicii Moldova pentru modificarea şi completarea unor acte legislative, nr.252 din 08.11.2012, prin aceasta revenindu-se la concepţia anterioară de categorisire a torturii, adică la cea consacrată în legea penală în re­dacţia din 1961. Graţie analizei comparative a reglementărilor penale ale Republicii Moldova şi ale altor state referitoare la răspunderea pentru tortură, tratament inuman sau degradant, pe de o parte, şi sintetizării jurisprudenţei CtEDO în materie, pe de altă parte, a fost ilustrată natura juridică şi socială a acestor fapte prejudiciabile, din care s-au putut desprinde explicaţiile de rigoare ce au stat la baza remanierilor legislative intervenite prin Legea Republicii Moldova pentru modi­ficarea şi completarea unor acte legislative, nr.252 din 08.11.2012.RECONSIDERING THE CRIMINALISATION OF TORTURE, INHUMAN OR DEGRADING TREATMENT BY LAW NR.252 OF 8/11/2012This study is dedicated to identification of the rationalities of the Moldovan legislator to criminalise the title of nomen juris the facts of torture, inhuman or degrading treatment in Chapter III of the Special Part of the Criminal Code - "Crimes against freedom, honor and dignity". This concern is dictated particularly by differences that impose a particular side of location in the Chapter, between the current incriminatory model and the matters which operated until the intervention to the Law of the Republic

  6. UV-violet emission properties of 2F(2)5/2 energy level of Nd3+ ions in ZBLAN glass

    Science.gov (United States)

    Klimczak, M.; Piramidowicz, R.

    2012-03-01

    In this work the short-wavelength emission properties are investigated for the highest observed 4f metastable energy level 2F(2)5/2 of Nd3+ ions in fluorozirconate ZBLAN glass. Various dopant concentrations, ambient temperatures and excitation conditions have been considered throughout the study. Distinct spectral features were observed under pulsed and cw excitation at 514 nm. In particular, pulsed pumping enabled recording of 2F(2)5/2 emission spectra, not observable under CW excitation, as well as the level's fluorescence decay dynamics and its evolution with temperature and dopant concentration. According to the best of the authors' knowledge, neither the fluorescence lifetime of 2F(2)5/2 of Nd3+ in ZBLAN, nor its concentration dependent evolution were reported before.

  7. Importance of the neutrons kerma coefficient in the planning of Brachytherapy treatments with Cf-252 sources; Importancia del coeficiente de kerma de neutrones en la planeacion de tratamientos de Braquiterapia con fuentes de Cf-252

    Energy Technology Data Exchange (ETDEWEB)

    Paredes G, L.; Balcazar G, M. [ININ, 52045 Ocoyocac, Estado de Mexico (Mexico); Azorin N, J. [Universidad Autonoma Metropolitana, 09000 Mexico D.F. (Mexico); Francois L, J.L. [UNAM, 04500 Mexico D.F. (Mexico)]. e-mail: lpg@nuclear.inin.mx

    2006-07-01

    The Cf-252 is a fast neutrons emitting radioisotope by spontaneous fission that can be used as sealed source in medicine applications, industry and research. Commercially its offer sources of different sizes, compact and with a fast neutrons emission of the order of 10{sup 6} n/s-{mu}g and an energy spectra that presents respectively maxim and average energy in 2.1 MeV and 0.7 MeV. In medicine new applications are being developed for the treatment of patient with hypoxic and voluminous tumors, where the therapy with photons has not given positive results, as well as for the protocols of therapy treatment by boron neutron capture, where very small sources of Cf-252 will be used with the interstitial brachytherapy technique of high and low dose rate. In this work an analysis of how the small differences that exist in the elementary composition of 4 wicked tumors, 4 ICRU healthy tissues and 3 substitute materials of ICRU tissue used in dosimetry are presented, its generate changes in the neutrons kerma coefficient in function of the energy and consequently in the absorbed dose in the interval of 11 eV to 29 MeV. These differences can produce maximum variations of the neutron kerma coefficients ratio for E{sub n} > 1 keV of the one: 15% tumor/ICRU guest healthy tissue, 12% ICRU tumor/muscle, 12% ICRU healthy tissues ICRU/ICRU muscle, 22% substitutes tissue/tumor and 22% ICRU substitutes tissue/muscle. Also, it was found that the average value of the neutrons kerma coefficient for the 4 wicked tumors is from 6% to 7% smaller that the average value for the soft tissue in the interval energy of interest for therapy with fast neutrons with E{sub n} > 1 MeV. These results have a special importance during the planning process of brachytherapy treatments with sources of {sup 252}Cf, to optimize and to individualize the patients treatments. (Author)

  8. The Software Design for252Cf Neutron Activation Fuel Rod 235U Enrichment Inspecting Equipment%252Cf中子活化核燃料棒235U富集度检测设备的软件设计

    Institute of Scientific and Technical Information of China (English)

    张雷; 刘明; 马金波

    2013-01-01

    It introduces the software design for 252Cf neutron activation fuel red235U enrichment inspecting equipment.It used multithread technique to control Advantech PCI-1780 counter/timer card,and collect γ-ray signal from the six-path detectors.Process and analyze the collected data can exactly check the actual 235U enrichment and abnormal pellets in the nuclear fuel rods.The software can measure the actual 235U enrichment and judge whether there are abnormal pellets in the nuclear fuel rods accurately,and send customizing messages to PLC which complete automatic sorting,at 6 m/min detection speed.Now the software is used on nondestructive test equipment in Nuclear Fuel Element Factory.%介绍了252Cf中子活化核燃料棒235U富集度检测设备的软件设计,该软件采用多线程技术控制研华PCI-1780采集卡定时采集六路探测器输出的经252Cf中子活化后235U裂变产物的γ射线信号,针对采集数据的特性,进行相应的处理和分析,可以检测出核燃料棒的实际235U富集度以及有无异常芯块.该软件经过实验验证在检测速度为6时,能够准确测量核燃料棒的实际235U富集度值并判断棒中是否混有异常芯块,同时向PLC发送相应信号实现自动分选.目前已应用在核燃料元件厂的核燃料棒235U富集度无损检测设备上.

  9. Numerical Simulation of Gas Flow During Arcing Process for 252 kV Puffer Circuit Breakers%Numerical Simulation of Gas Flow During Arcing Process for 252 kV Puffer Circuit Breakers

    Institute of Scientific and Technical Information of China (English)

    吴军辉; 王小华; 马志瀛; 荣命哲; 闫静

    2011-01-01

    A numerical simulation model for 252 kV puffer circuit breaker is constructed, by using a proven commercial computational fluid dynamics (CFD) package, PHOENICS. The model takes into account the moving parts in the circuit breaker, turbulence enhanced momentum and energy transport, radiation transport. The arcing process in a SF6 puffer circuit breaker with two hollow contacts is simulated under different conditions, and the simulation results are verified with experimental results. Through simulation, the pressure, temperature and velocity in the arc quenching chamber can be obtained. The simulation model is also capable of predicting the influence of design parameters variations on breaker performance, and can thus help to reduce the number of short-circuit tests during the design stage.

  10. Magnetic behavior of the oxide spinels: Li0.5Fe2.5-2AlCrO4

    Indian Academy of Sciences (India)

    U N Trivedi; K B Modi; H H Joshi

    2002-05-01

    In order to study the effect of substitution of Fe3+ by Al3+ and Cr3+ in Li0.5Fe2.5O4 on its structural and magnetic properties, the spinel system Li0.5AlCrFe2.5-2O4 ( = 0.0, 0.2, 0.4, 0.5, 0.6 and 0.8) has been characterized by X-ray diffraction, high field magnetization, low field ac susceptibility and 57Fe Mössbauer spectroscopy. Contrary to the earlier reports, about 50% of Al3+ is found to occupy the tetrahedral sites. The system exhibits canted spin structure and a central paramagnetic doublet was found superimposed on magnetic sextet in the Mössbauer spectra ( > 0.5).

  11. Comparative dosimetry in intracavitary balloon catheter brachytherapy with I-125 and in Cf-252 brachytherapy combined with BNCT for brain tumors

    Energy Technology Data Exchange (ETDEWEB)

    Brandao, Samia de Freitas, E-mail: samiabrandao@gmail.com [Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG (Brazil). Departamento de Engenharia Nuclear; Campos, Tarcisio Passos Ribeiro de [Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG (Brazil)

    2013-06-15

    Objective: comparative analysis of dosimetry in intracavitary balloon catheter brachytherapy with I-125 and in Cf-252 brachytherapy combined with BNCT for treatment of brain tumors. Materials and methods: simulations of intracavitary balloon catheter brachytherapy with I-125 and in Cf-252 brachytherapy combined with BNCT were performed with the MCNP5 code, modeling the treatment of a brain tumor on a voxel computational phantom representing a human head. Absorbed dose rates were converted into biologically weighted dose rates. Results: intracavitary balloon catheter brachytherapy with I-125 produced biologically weighted mean dose rates of 3.2E-11, 1.3E-10, 1.9E-11 and 6.9E-13 RBE.Gy.h{sup -1}.p{sup -1}.s, respectively, on the healthy tissue, on the balloon periphery and on the /{sub 1} and /{sub 2} tumor infiltration zones. On the other hand, Cf-252 brachytherapy combined with BNCT produced a biologically weighted mean dose rate of 5.2E-09, 2.3E-07, 8.7E-09 and 2.4E-09 RBE.Gy.h{sup -1}.p{sup -1}.s, respectively on the healthy tissue, on the target tumor and on the /{sub 1} and /{sub 2} infiltration zones. Conclusion: Cf-252 brachytherapy combined with BNCT delivered a selective irradiation to the target tumor and to infiltration zones, while intracavitary balloon catheter brachytherapy with I-125 delivered negligible doses on the tumor infiltration zones. (author)

  12. Maximum Alpha to Minimum Fission Pulse Amplitude for a Parallel-Plate and Hemispherical Cf-252 Ion-Chamber Instrumented Neutron Source

    Energy Technology Data Exchange (ETDEWEB)

    Oberer, R.B.

    2000-12-07

    In an instrumented Cf-252 neutron source, it is desirable to distinguish fission events which produce neutrons from alpha decay events. A comparison of the maximum amplitude of a pulse from an alpha decay with the minimum amplitude of a fission pulse shows that the hemispherical configuration of the ion chamber is superior to the parallel-plate ion chamber.

  13. 30 CFR 252.3 - Oil and gas data and information to be provided for use in the OCS Oil and Gas Information Program.

    Science.gov (United States)

    2010-07-01

    ... 30 Mineral Resources 2 2010-07-01 2010-07-01 false Oil and gas data and information to be provided... PROGRAM § 252.3 Oil and gas data and information to be provided for use in the OCS Oil and Gas Information... production of, oil and gas on the OCS shall provide the Director access to all data and information......

  14. Influence of gain-of-function mutation (Ser252Trp in fibroblast growth factor receptor 2 gene on long bone development

    Directory of Open Access Journals (Sweden)

    Peng CHEN

    2013-07-01

    Full Text Available Objective To observe the early postnatal long bone development in Fgfr2+/S252W mutant mice and littermate wild-type (WT mice, and explore the effect of continued function enhancement of fibroblast growth factor receptor 2 (FGFR2 gene on endochondral ossification. Methods A mouse model of Fgfr2+/S252W simulated human Apert syndrome was reproduced by knock-in technique, and then the gain-of-function mutation Fgfr2+/S252W mice and littermate WT mice were obtained after breeding and identification. Three Fgfr2+/S252W and same number of WT mice were sacrificed at 7, 10, 14 and 28 postnatal days respectively, and the morphology of long bone was examined with X-ray and Micro CT, the structure of bone and cartilage was observed by HE staining, and the expression of gene in growth plate was observed by immunohistochemical analysis. Results Fgfr2+/S252W mouse model exhibited typical craniosynostosis and brachycephalium of Apert syndrome, accompanied by short stature, growth retardation of long bone, delayed appearance of secondary ossification center, decrease of bone density and trabecula number. HE staining showed noticeable shortened zones of proliferation and hypertrophic chondrocytes, irregularity of cell arrangement, and small hypertrophic chondrocytes in the growth plates of the mutant mice. Immunohistochemical analysis revealed that the expression of genes related to chondrocytes proliferation and differentiation was decreased in mutant mice. Conclusions Gain-of-function mutation in FGFR2 may lead to abnormal development of long bone in mice. FGFR2 may have the function of regulating the development both of osteoblast and chondrocyte lineages, and play an important role in the process of skeletal development.

  15. 脑源性神经营养因子/酪氨酸激酶受体B信号通路抑制剂K252a逆转丙戊酸引起的神经元过度生长%BDNF/TrkB pathway inhibitor K252a reverses the neuronal overgrowth induced by valproic acid in vitro

    Institute of Scientific and Technical Information of China (English)

    王中平; 熊小琴; 崔卫刚; 张应花; 李瑞锡

    2013-01-01

    目的:探讨脑源性神经营养因子(BDNF)/酪氨酸激酶受体B(TrkB)信号通路抑制剂K252a是否对丙戊酸引起的神经元过度生长有逆转作用.方法:用丙戊酸及K252a分别或共处理大鼠大脑皮层原代培养神经元,定量RT-PCR及免疫印迹检测BDNF/TrkB通路蛋白BDNF及TrkB的表达变化,同时以免疫荧光技术观测神经元形态变化.结果:丙戊酸处理后,显著增加神经元BDNF mRNA的表达,TrkB mRNA的表达则未见明显变化;丙戊酸处理也导致BDNF蛋白表达上调.而用K252a处理后,神经元BDNF及TrkB表达与对照组相比,无明显变化.形态学结果显示,丙戊酸处理后,神经元过度生长,表现为神经元突起数目及总长度显著增加;而K252a处理后,丙戊酸引起的神经元突起过度生长受到明显抑制.结论:BDNF/TrkB通路抑制剂K252a可逆转丙戊酸导致的神经元过度生长.该结果为丙戊酸及K252a应用于临床治疗某些神经发育与退行性疾病如自闭症及阿尔茨海默病等提供了实验依据.%Objective:To investigate the reverse effect of K252a, an inhibitor of BDNF/TrkB pathway which plays an important role in the neuronal proliferation, differentiation and neurite growth, on the neuronal overgrowth induced by valproic acid (VPA). Methods: The primary cultured neurons from the rat cortex were exposed to VPA, VPA plus K252a or the control. The expressions of BDNF and TrkB were tested by quantitative RT-PCR and Western blotting, and the morphological changes of the neurons were observed by immunofluorescence. Results: VPA exposure, in comparison with the control, increased the expression of both mRNA and protein of BDNF, but not of TrkB. However, K252a treatment did not affect the expression of BDNF and TrkB in the cultured neurons. The results also showed that VPA treatment promoted neuronal growth, manifesting as a significant increment of the number of the neurite branches and total neurite length. Furthermore, the

  16. Nuclear isomerism in fission fragments produced by the spontaneous fission of {sup 252}Cf; Isomerisme nucleaire dans les fragments de fission produits dans la fission spontanee du {sup 252}Cf

    Energy Technology Data Exchange (ETDEWEB)

    Gautherin, C

    1997-09-01

    This thesis is devoted to the study of the nuclear structure of neutron-rich nuclei, via the search of isomeric nuclear states. Neutron-rich nuclei were produced in the spontaneous fission of {sup 252}Cf. The experimental study of isomeric states in these nuclei was performed with the {gamma}-array EUROGAM II, coupled to an additional and original fission fragment detector composed by photovoltaic cells, SAPhIR. The photovoltaic cells are well adapted to detect low energy heavy ions and have good energy and time resolutions to obtain a good fission fragment detection. This experiment led to the discovery of new isomeric states in {sup 135}Xe, {sup 104}Mo, {sup 146,147,148}Ce and {sup 152,154,156}Nd, with lifetimes between 60 ns and 2 {mu}s. Level schemes of these nuclei have been completed. An interpretation of the isomeric states in the nuclei {sup 154,156}Nd and {sup 156,158}Sm was performed by Hartree-Fock-Bogolyubov calculations using the DIS Gogny force with two quasi-particles excitations. The confrontation with the experimental results led to an interpretation of these isomeric states as K-isomers. (author)

  17. Effects of Exposure of Pink Shrimp, Farfantepenaeus duorarum, Larvae to Macondo Canyon 252 Crude Oil and the Corexit Dispersant

    Directory of Open Access Journals (Sweden)

    Susan Laramore

    2016-03-01

    Full Text Available The release of oil into the Gulf of Mexico (GOM during the Deepwater Horizon event coincided with the white and pink shrimp spawning season. To determine the potential impact on shrimp larvae a series of static acute (24–96 h toxicity studies with water accommodated fractions (WAFs of Macondo Canyon (MC 252 crude oil, the Corexit 9500A dispersant, and chemically enhanced WAFS (CEWAFs were conducted with nauplii, zoea, mysid, and postlarval Farfantepenaeus duorarum. Median lethal concentrations (LC50 were calculated and behavior responses (swimming, molting, light sensitivity evaluated. Impacts were life stage dependent with zoea being the most sensitive. Behavioral responses for all stages, except postlarvae, occurred at below LC50 values. Dispersants had the greatest negative impact while WAFs had the least. No short-term effects (survival, growth were noted for nauplii exposed to sub-lethal CEWAFs 39 days post-exposure. This study points to the importance of evaluating multiple life stages to assess population effects following contaminant exposure and further, that the use of dispersants as a method of oil removal increases oil toxicity.

  18. Measurement of the energy spectrum of {sup 252}Cf fission fragments using nuclear track detectors and digital image processing

    Energy Technology Data Exchange (ETDEWEB)

    Espinosa, G.; Golzarri, J. I. [UNAM, Instituto de Fisica, Circuito Exterior, Ciudad Universitaria, 04510 Mexico D. F. (Mexico); Castano, V. M. [UNAM, Centro de Fisica Aplicada y Tecnologia Avanzada, Boulevard Juriquilla 3001, Santiago de Queretaro, 76230 Queretaro (Mexico); Gaso, I. [ININ, Carretera Mexico-Toluca s/n, Ocoyoacac 52750, Estado de Mexico (Mexico); Mena, M.; Segovia, N. [UNAM, Instituto de Geofisica, Circuito de la Investigacion Cientifica, Ciudad Universitaria, 04510 Mexico D. F. (Mexico)

    2010-02-15

    The energy spectrum of {sup 252}Cf fission fragments was measured using nuclear track detectors and digital image analysis system. The detection material was fused silica glass. The detectors were chemically etched in an 8% HF solution. After experimenting with various etching time, it was found that the best resolution of the track diameter distribution was obtained after 30 minutes of etching. Both Gaussian and Lorentzian curves were fit to the track diameter distribution histograms and used to determine the basic parameters of the distribution of the light (N{sub L}) and heavy (N{sub H}) formed peaks and the minimum of the central valley (N{sub V}). Advantages of the method presented here include the fully-automated analysis process, the low cost of the nuclear track detectors and the simplicity of the nuclear track method. The distribution resolution obtained by this method is comparable with the resolution obtained by electronic analysis devices. The descriptive variables calculated were very close to those obtained by other methods based on the use of semiconductor detectors. (Author)

  19. Determining the neutron spectrum of 241Am-Be and 252Cf sources using bonner sphere spectrometer

    Directory of Open Access Journals (Sweden)

    M.A Varshabi

    2016-06-01

    Full Text Available Bonner spheres system is one of the ways of measuring neutron energy distribution which is often applied in spectrometry and neutron dosimetry. This system includes a thermal neutron detector, being located in the center of several polyethylene spheres, and it is still workable due to the isotropic response of the system which in turn is derived from the spherical symmetry of moderators and the broad measurable range of the energy. In order to practically use this spectrometer, it is necessary to calibrate this system using standard neutron sources. This research aimed to determine the calibration factor of Bonner spheres spectrometry system and energy spectrum of two standard 241Am-Be and 252Cf sources in the atomic energy organization. Calibration and experimental measurement were done via the two standard sources. The response vector of each detector was derived by using MCNPX simulation code, based on the Monte Carlo method. The spectra unfolding of this system was performed through iterative method using the SPUNIT code done in software NSDUAZ6LiI and BUMS. 

  20. A cumulative analysis of odontogenic cysts from major dental institutions of Bangalore city: A study of 252 cases

    Directory of Open Access Journals (Sweden)

    Prashanth Ramachandra

    2011-01-01

    Full Text Available Background: The objective of this study was to perform a cumulative analysis of odontogenic cysts obtained from the data of major dental institutions of Bangalore city, as well as to evaluate their distribution during a 5-year period and compare the results with other international studies. Materials and Methods: Data for the study were obtained from the reports of patients diagnosed with odontogenic cysts between 2005 and 2010 from different dental institutions of Bangalore. Case records of patients that fit the histological classification of the World Health Organization (WHO (2005 were included in the study and the following variables were analyzed: age, gender, anatomic location, and histological type. Results: In a total of 252 cyst specimens diagnosed, 79.76% were odontogenic cysts and 20.24% were nonodontogenic cysts. Among the odontogenic cysts most frequent lesions were radicular cysts (50.25%, followed by keratocysts (27.36% and dentigerous cysts (22.39%. Conclusions: Our study provides a cumulative data of odontogenic cysts in the population of Bangalore city. The results of our study showed a similar frequency of odontogenic cysts as compared to other populations of the world, with radicular cyst being identified as the most frequent odontogenic cyst. Keratocyst was the second most common cyst followed by dentigerous cyst.

  1. Gamma-ray multiplicity measurement of the spontaneous fission of {sup 252}Cf in a segmented HPGe/BGO detector array

    Energy Technology Data Exchange (ETDEWEB)

    Bleuel, D.L., E-mail: bleuel1@llnl.go [Lawrence Livermore National Laboratory, Livermore, CA 94551 (United States); Bernstein, L.A.; Burke, J.T. [Lawrence Livermore National Laboratory, Livermore, CA 94551 (United States); Gibelin, J. [Lawrence Berkeley National Laboratory, Berkeley, CA 94720 (United States); Heffner, M.D. [Lawrence Livermore National Laboratory, Livermore, CA 94551 (United States); Mintz, J. [Nuclear Engineering Department, University of California, Berkeley, CA 94720 (United States); Norman, E.B. [Lawrence Livermore National Laboratory, Livermore, CA 94551 (United States); Lawrence Berkeley National Laboratory, Berkeley, CA 94720 (United States); Nuclear Engineering Department, University of California, Berkeley, CA 94720 (United States); Phair, L. [Lawrence Berkeley National Laboratory, Berkeley, CA 94720 (United States); Scielzo, N.D.; Sheets, S.A.; Snyderman, N.J.; Stoyer, M.A. [Lawrence Livermore National Laboratory, Livermore, CA 94551 (United States); Wiedeking, M. [Lawrence Livermore National Laboratory, Livermore, CA 94551 (United States); Lawrence Berkeley National Laboratory, Berkeley, CA 94720 (United States)

    2010-12-21

    Coincident {gamma} rays from a {sup 252}Cf source were measured using an array of six segmented high-purity germanium (HPGe) Clover detectors each enclosed by 16 bismuth-germanate (BGO) detectors. The detectors were arranged in a cubic pattern around a 1{mu}Ci{sup 252}Cf source to cover a large solid angle for {gamma}-ray measurement with a reasonable reconstruction of the multiplicity. Neutron multiplicity was determined in certain cases by identifying the prompt {gamma} rays from individual fission fragment pairs. Multiplicity distributions from previous experiments and theoretical models were convolved with the response function of the array and compared to the present results. These results suggest a {gamma}-ray multiplicity spectrum broader than previous measurements and models, and provide no evidence of correlation with neutron multiplicity.

  2. Gamma-ray multiplicity measurement of the spontaneous fission decay of 252Cf in a segmented HPGe/BGO detector array

    Energy Technology Data Exchange (ETDEWEB)

    Bleuel, D L; Bernstein, L A; Burke, J T; Gibelin, J; Heffner, M D; Mintz, J; Norman, E B; Phair, L; Scielzo, N D; Sheets, S A; Snyderman, N J; Stoyer, M A; Wiedeking, M

    2008-04-23

    Coincident {gamma} rays from a {sup 252}Cf source were measured using an array of six segmented high-purity germanium (HPGe) Clover detectors each enclosed by 16 bismuth-germanate (BGO) detectors. The detectors were arranged in a cubic pattern around a 1 {micro}Ci {sup 252}Cf source to cover a large solid angle for {gamma}-ray measurement with a reasonable reconstruction of the multiplicity. Neutron multiplicity was determined in certain cases by identifying the prompt {gamma} rays from individual fission fragment pairs. Multiplicity distributions from previous experiments and theoretical models were convolved with the response function of the array and compared to the present results. These results suggest a {gamma}-ray multiplicity spectrum broader than previous measurements and models, and provide no evidence of correlation with neutron multiplicity.

  3. Residues 248-252 and 300-304 of the cardiac Na+/Ca2+ exchanger are involved in its regulation by phospholemman.

    Science.gov (United States)

    Zhang, Xue-Qian; Wang, JuFang; Song, Jianliang; Ji, Angi M; Chan, Tung O; Cheung, Joseph Y

    2011-10-01

    Using split cardiac Na(+)/Ca(2+) exchangers (NCX1), we previously demonstrated that phospholemman (PLM) regulates NCX1 by interacting with the proximal linker domain (residues 218-358) of the intracellular loop of NCX1. With the use of overlapping loop deletion mutants, interaction sites are localized to two regions spanning residues 238-270 and residues 300-328 of NCX1. In this study, we used alanine (Ala) linker scanning to pinpoint the residues in the proximal linker domain involved in regulation of NCX1 by PLM. Transfection of human embryonic kidney (HEK)293 cells with wild-type (WT) NCX1 or its Ala mutants but not empty vector resulted in NCX1 current (I(NaCa)). Coexpression of PLM with WT NCX1 inhibited I(NaCa). Mutating residues 248-252 (PASKT) or 300-304 (QKHPD) in WT NCX1 to Ala resulted in loss of inhibition of I(NaCa) by PLM. By contrast, inhibition of I(NaCa) by PLM was preserved when residues 238-242, 243-247, 253-257, 258-262, 263-267, 305-309, 310-314, 315-319, 320-324, or 325-329 were mutated to Ala. While mutating residue 301 to alanine completely abolished PLM inhibition, mutation of any single residue 250-252, 300, or 302-304 resulted in partial reduction in inhibition. Mutating residues 248-252 to Ala resulted in significantly weaker association with PLM. The NCX1-G503P mutant that lacks Ca(2+)-dependent activation retained its sensitivity to PLM. We conclude that residues 248-252 and 300-304 in the proximal linker domain of NCX1 were involved in its inhibition by PLM.

  4. Generation of the V4.2m5 and AMPX and MPACT 51 and 252-Group Libraries with ENDF/B-VII.0 and VII.1

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Kang Seog [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Consortium for Advanced Simulation of LWRs (CASL)

    2016-12-12

    The evaluated nuclear data file (ENDF)/B-7.0 v4.1m3 MPACT 47-group library has been used as a main library for the Consortium for Advanced Simulation of Light Water Reactors (CASL) neutronics simulator in simulating pressurized water reactor (PWR) problems. Recent analysis for the high void boiling water reactor (BWR) fuels and burnt fuels indicates that the 47-group library introduces relatively large reactivity bias. Since the 47- group structure does not match with the SCALE 6.2 252-group boundaries, the CASL Virtual Environment for Reactor Applications Core Simulator (VERA-CS) MPACT library must be maintained independently, which causes quality assurance concerns. In order to address this issue, a new 51-group structure has been proposed based on the MPACT 47- g and SCALE 252-g structures. In addition, the new CASL library will include a 19-group structure for gamma production and interaction cross section data based on the SCALE 19- group structure. New AMPX and MPACT 51-group libraries have been developed with the ENDF/B-7.0 and 7.1 evaluated nuclear data. The 19-group gamma data also have been generated for future use, but they are only available on the AMPX 51-g library. In addition, ENDF/B-7.0 and 7.1 MPACT 252-g libraries have been generated for verification purposes. Various benchmark calculations have been performed to verify and validate the newly developed libraries.

  5. Optical and Near-infrared survey of the stellar contents associated with the star-forming Complex Sh2-252

    CERN Document Server

    Jose, Jessy; Ogura, K; Samal, M R; Ojha, D K; Bhatt, B C; Chauhan, N; Eswaraiah, C; Mito, H; Kobayashi, N; Yadav, R K; 10.1111/j.1365-2966.2012.21175.x

    2013-01-01

    We present the analyses of the stellar contents associated with the HII region Sh2-252 using UBVRI photometry, slit and slitless spectroscopy along with the NIR data from 2MASS for an area ~1 degree x 1 degree. We studied the sub-regions of Sh2-252 which includes four compact-HII (CHII) regions, namely A, B, C and E and two clusters NGC 2175s and Teutsch 136 (Teu 136). Of the fifteen spectroscopically observed bright stars, eight have been identified as massive members of spectral class earlier than B3. From the spectro-photometric analyses, we derived the average distance of the region as 2.4+/-0.2 kpc and the reddening of the massive members is found to vary between 0.35 to 2.1 mag. We found that NGC 2175s and Teu 136, located towards the eastern edge of the complex are the sub-clusters of Sh2-252. The stellar surface density distribution in K-band shows clustering associated with the regions A, C, E, NGC 2175s and Teu 136. We have also identified the candidate ionizing sources of the CHII regions. 61 H_alp...

  6. Shielding evaluation of a medical linear accelerator vault in preparation for installing a high-dose rate 252Cf remote afterloader.

    Science.gov (United States)

    Melhus, C S; Rivard, M J; Kurkomelis, J; Liddle, C B; Massé, F X

    2005-01-01

    In support of the effort to begin high-dose rate 252Cf brachytherapy treatments at Tufts-New England Medical Center, the shielding capabilities of a clinical accelerator vault against the neutron and photon emissions from a 1.124 mg 252Cf source were examined. Outside the clinical accelerator vault, the fast neutron dose equivalent rate was below the lower limit of detection of a CR-39 etched track detector and below 0.14 +/- 0.02 muSv h(-1) with a proportional counter, which is consistent, within the uncertainties, with natural background. The photon dose equivalent rate was also measured to be below background levels (0.1 muSv h(-1)) using an ionisation chamber and an optically stimulated luminescence dosemeter. A Monte Carlo simulation of neutron transport through the accelerator vault was performed to validate measured values and determine the thermal-energy to low-energy neutron component. Monte Carlo results showed that the dose equivalent rate from fast neutrons was reduced by a factor of 100,000 after attenuation through the vault wall, and the thermal-energy neutron dose equivalent rate would be an additional factor of 1000 below that of the fast neutrons. Based on these findings, the shielding installed in this facility is sufficient for the use of at least 5.0 mg of 252Cf.

  7. Biological, chemical and other data collected aboard the THOMAS G. THOMPSON during cruise TN252 in the Coastal Waters of SE Alaska and North Pacific Ocean from 2010-07-26 to 2010-08-23 (NODC Accession 0104356)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NODC accession 0104356 includes biological, chemical, optical, physical and underway data collected aboard the THOMAS G. THOMPSON during cruise TN252 in the Coastal...

  8. 252例老年颅内肿瘤术后并发症的相关因素分析%Risk factors related to surgical complications in 252 elderly brain tumors

    Institute of Scientific and Technical Information of China (English)

    陈晓霖; 赵元立; 王硕; 叶迅; 赵继宗

    2013-01-01

    目的 分析与老年颅内肿瘤术后并发症相关的因素.方法 对北京天坛医院2005年1月至2007年12月252例手术治疗的老年颅内肿瘤相关资料进行回顾性研究.分析诸多临床因素与老年颅内肿瘤患者术后发生并发症的关系.应用SPSS 13.0软件进行单因素分析和多因素Logistic 回归分析.结果 单因素分析显示,术前患者卡氏评分(KPS)、肿瘤部位、术中出血量、麻醉时间、手术时间等与术后并发症的发生有关.多因素分析显示,术前患者KPS评分和肿瘤部位是术后并发症的主要影响因素.结论 术前KPS小于90分和肿瘤位于幕下等是术后并发症的主要影响因素.术中出血量、麻醉时间以及手术时间等因素也与术后并发症发生率有一定相关.而年龄、性别、肿瘤切除程度和术前美国麻醉师协会评分(ASA)等在本研究中显示不是术后并发症的主要影响因素.%Objective To investigate the factors associated with surgical complications.Methods A consecutive series of 252 surgeries performed from January 2005 to December 2007 were retrospectively analyzed.Age,sex,preoperative Karnofsky scale (KPS),American Society of Anesthesiologists (ASA) status,anatomic localization,extent of tumor resection,bleeding volume,anesthesia time and duration of the whole operation were evaluated.Results In multivariate analysis,only pre-operative KPS (P =0.001) and infratentorial tumors (P =0.019) showed the significant association with post-operative complications.Conclusion It shows that the preoperative KP5 and infratentorial location are the factors related to post-operative complications,whereas age,sex,ASA status,extent of tumor resection,the bleeding volume,anesthesia time and duration of the whole operation are not the risk factors.

  9. 252 Cases of Trace Elements in Peripheral Blood of Children and Correlation Analysis Results%252例儿童末梢血微量元素的检测结果及相关性分析

    Institute of Scientific and Technical Information of China (English)

    汪玥

    2012-01-01

      Objective In order to understand our city children aged 0 to 7,trace elements intake, clinical guidance, selective reasonable to add trace elements for children. Methods The children randomly selected pediatric patient health cards and children aged 0 to 7 252 cases, using Beijing Optoelectronic Technology Co,Ltd. Bo Hui innovative products BH5100T type five-channel atomic absorption spectrometry for zinc, iron, calcium, magnesium, copper 5 Detection of trace elements, and do statistical analysis. Results The children in our city there are different levels of trace element deficiency, including zinc, iron, calcium deficiency is the most serious, rates were 48.4%,50.8% and 47.6%, lack of magnesium and lack of copper lower incidences of 7.1 per cent, respectively with 9.5%;the results show that various micronutrient deficiencies in the gender difference was not statistically significant(P>0.05). Conclusion The results show that the intake of trace elements in our city children can not be optimistic,reasonable to add trace elements, can effectively prevent children from lack of trace elements, trace elements to prevent the abuse of excessive complement blindness.%  目的为了解我市0~7岁儿童微量元素摄入情况,指导临床,有选择性的给儿童合理补充微量元素.方法随机抽查儿保健卡和儿科门诊的0~7岁儿童252例,利用北京博晖创新光电技术股份有限公司生产的 BH5100T 型五通道原子吸收光谱仪进行锌、铁、钙、镁、铜五种微量元素的检测,并做统计学分析.结果我市儿童存在不同程度的微量元素缺乏情况,其中锌、铁、钙缺乏情况最为严重,发生率分别为48.4%、50.8%和47.6%,缺镁和缺铜的发生率较低,分别为7.1%和9.5%;分析发现各种微量元素缺乏在性别上差异无显著性(P>0.05).结论分析结果表明我市儿童的微量元素摄入不均衡,合理补充微量元素,可以有效的防止儿童微量元

  10. Effect of Macondo Prospect 252 Oil on Microbiota Associated with Pelagic Sargassum in the Northern Gulf of Mexico.

    Science.gov (United States)

    Torralba, Manolito G; Franks, James S; Gomez, Andres; Yooseph, Shibu; Nelson, Karen E; Grimes, D Jay

    2017-01-01

    The environmental impact of major oil spills on marine microorganisms has yet to be thoroughly investigated using molecular biology techniques. The Deepwater Horizon (DWH) drilling rig explosion of 2010 affected an approximately 176,000 km(2) surface area of the Gulf of Mexico (GOM) when an estimated 210 million gallons of oil from the Macondo Prospect spilled into the environment. Pelagic Sargassum, a complex of two surface drifting species (Sargassum natans and Sargassum fluitans) of marine brown macroalgae and a critically important habitat in the GOM ecosystem, was suffused by Macondo Prospect 252 oil released during the DWH event. Using 16S rRNA PCR and Roche 454 pyrosequencing, the effect of the oil on the bacterial population associated with pelagic Sargassum and contiguous waters was examined by comparing sequence data generated from samples collected from oiled and non-oiled locations in the northern GOM. Sequence data showed similar microbial composition in Sargassum regardless of exposure to oil primarily dominated by five phyla; Proteobacteria, Bacteroidetes, Actinobacteria, Verrucomicrobia, and unclassified bacteria. The microbial composition in water samples was significantly less diverse than for Sargassum and consisted primarily of Proteobacteria, Firmicutes, and Bacteroidetes. Due to the evenly distributed abundance of microbial species on oiled and non-oiled pelagic Sargassum, study findings indicate that DWH spilled oil had minimal effect on the composition and diversity of the microbial community associated with Sargassum and contiguous waters. However, higher abundances of Sulfitobacter and one species of Psychrobacter were found in oiled water samples when compared to non-oiled water samples indicating some effect of DHW oil in the microbial composition of seawater. Though there are a number of marine studies using molecular biology approaches, this is the first molecular examination of the impact of the DWH oil spill on bacterial communities

  11. Figure of Merit for Chlorine Measurement in Reinforced Concrete Using {sup 252}Cf-Based Nondestructive Testing Method

    Energy Technology Data Exchange (ETDEWEB)

    Habeeb H. Saleh; Richard A. Livington

    2000-11-12

    The objective of this study is to design, fabricate, and evaluate a portable system for nondestructive determination of chloride concentration in reinforced portland cement concrete (PCC) structures. The need for such an instrument arises from the massive deterioration of the reinforced PCC, which has been used to construct a major part of the highway infrastructure. This deterioration of PCC is due to corrosion of the reinforcing steel, which is greatly promoted by the chloride ions. The sources of chloride include deicing salts, set accelerator, and seawater, either in the form of concrete-mixing water or as airborne droplets from ocean spray. The system consists of a high-purity germanium detector for gamma-ray detection and a portable {sup 252}Cf neutron source. Tradeoffs in the design of the neutron source include data quality, operational efficiency, and radiation safety. The number of photons detected in the germanium detector is directly proportional to the neutron source strength and the chloride nuclei concentration in the sample under testing. Therefore, assuming a uniform distribution of chloride, the figure of merit of the number of photons detected in the detector can be expressed as F = C/SN, where C = number of (6111) keV gamma rays detected per second, N = concentration of chloride nuclei, and S = neutron source strength (n/s). Under the assumption that the neutron source strength is fixed, the figure of merit in this case can have at least two uses. One is to optimize the thermalization efficiency of the neutron moderator. The second is to evaluate how effective the detector configuration is in detecting the gamma rays generated in the concrete. Using the figure-of-merit approach, it is possible to find an optimum size of moderator. This is important for a portable system. Other variables such as source/detector separation or detector gamma-ray shielding can also be evaluated.

  12. Microarray analysis of DNA damage repair gene expression profiles in cervical cancer cells radioresistant to 252Cf neutron and X-rays

    Directory of Open Access Journals (Sweden)

    Yang Zhen-Zhou

    2010-02-01

    Full Text Available Abstract Background The aim of the study was to obtain stable radioresistant sub-lines from the human cervical cancer cell line HeLa by prolonged exposure to 252Cf neutron and X-rays. Radioresistance mechanisms were investigated in the resulting cells using microarray analysis of DNA damage repair genes. Methods HeLa cells were treated with fractionated 252Cf neutron and X-rays, with a cumulative dose of 75 Gy each, over 8 months, yielding the sub-lines HeLaNR and HeLaXR. Radioresistant characteristics were detected by clone formation assay, ultrastructural observations, cell doubling time, cell cycle distribution, and apoptosis assay. Gene expression patterns of the radioresistant sub-lines were studied through microarray analysis and verified by Western blotting and real-time PCR. Results The radioresistant sub-lines HeLaNR and HeLaXR were more radioresisitant to 252Cf neutron and X-rays than parental HeLa cells by detecting their radioresistant characteristics, respectively. Compared to HeLa cells, the expression of 24 genes was significantly altered by at least 2-fold in HeLaNR cells. Of these, 19 genes were up-regulated and 5 down-regulated. In HeLaXR cells, 41 genes were significantly altered by at least 2-fold; 38 genes were up-regulated and 3 down-regulated. Conclusions Chronic exposure of cells to ionizing radiation induces adaptive responses that enhance tolerance of ionizing radiation and allow investigations of cellular radioresistance mechanisms. The insights gained into the molecular mechanisms activated by these "radioresistance" genes will lead to new therapeutic targets for cervical cancer.

  13. Fine frequency tuning in sum-frequency generation of continuous-wave single-frequency coherent light at 252 nm with dual-wavelength enhancement.

    Science.gov (United States)

    Kumagai, Hiroshi

    2007-01-01

    Fine frequency tuning of the deep-ultraviolet single-mode coherent light at 252 nm was conducted through the PID feedback system automatically by changing the temperature of a beta-BaB(2)O(4) (BBO) crystal in a doubly resonant external cavity for the sum-frequency mixing of 373 and 780 nm light. The temperature-dependent frequency tuning rate is 19.3 MHzK(-1), which is sufficiently fine to realize the laser cooling of neutral silicon atoms because the natural width of the laser cooling transition is 28.8 MHz.

  14. 纤丽的时尚——明基Joyhub La Vie E252台式机

    Institute of Scientific and Technical Information of China (English)

    壹分

    2008-01-01

    Joyhub La Vie系列台式机主要以外观设计作为最大卖点,E252自然也是如此。从整体上来看,无论是主机箱、显示器还是键盘鼠标,E252在配色上均选择了白色作为主色,并在机箱上辅以色带作为装饰。目前厂商提供浅蓝和粉红两种色带装饰的机型可供选择,分别以男孩和女孩作为面向对象。为了更加突出色带的装饰效果,明基特别在机箱前面板的中部和底部色带内添置了LED灯设计,在开机状态下可让用户有更为丰富的视觉享受。

  15. Rapid Evolution to Blast Crisis Associated with a Q252H ABL1 Kinase Domain Mutation in e19a2 BCR-ABL1 Chronic Myeloid Leukaemia

    Directory of Open Access Journals (Sweden)

    Sarah L. McCarron

    2013-01-01

    Full Text Available A minority of chronic myeloid leukaemia (CML patients express variant transcripts of which the e19a2 BCR-ABL1 fusion is the most common. Instances of tyrosine kinase inhibitor (TKI resistance in e19a2 BCR-ABL1 CML patients have rarely been reported. A case of e19a2 BCR-ABL1 CML is described in whom imatinib resistance, associated with a Q252H ABL1 kinase domain mutation, became apparent soon after initiation of TKI therapy. The patient rapidly transformed to myeloid blast crisis (BC with considerable bone marrow fibrosis and no significant molecular response to a second generation TKI. The clinical course was complicated by comorbidities with the patient rapidly succumbing to advanced disease. This scenario of Q252H-associated TKI resistance with rapid BC transformation has not been previously documented in e19a2 BCR-ABL1 CML. This case highlights the considerable challenges remaining in the management of TKI-resistant BC CML, particularly in the elderly patient.

  16. Development of a novel near-infrared fluorescent theranostic combretastain A-4 analogue, YK-5-252, to target triple negative breast cancer.

    Science.gov (United States)

    Kong, Yali; Smith, Jacqueline; Li, Kongwen; Cui, Jake; Han, John; Hou, Shujie; Brown, Milton L

    2017-04-01

    The treatment of triple negative breast cancer (TNBC) is a significant challenge to cancer research. The lack of hormone receptors limits the treatment options available to patients with this diagnosis, forcing them to endure prolonged radiation and chemotherapy. Anti-angiogenesis is a chemotherapeutic strategy that targets the vasculature of tumors. Combretastatin A-4 (CA-4) is a well-known vasculature-disrupting agent, which has been shown to effectively kill a variety of cancers through inhibition of tubulin polymerization. Due to its toxicity, small molecule analogues of CA-4 have been sought out. We have designed a novel dual action CA-4 prodrug, YK-5-252, which releases the drug through a disulfide bond cleavage mechanism and contains a near-infrared (NIR) fluorophore, which allows fluorescence monitoring of cleavage. This disulfide linkage causes CA-4 to become effective only when released by glutathione (GSH) reducing the toxicity of the drug while simultaneously releasing the NIR fluorophore. Therefore the prodrug, YK-5-252, represents a novel CA-4 analogue which has reduced toxicity and can be used for theranostics imaging.

  17. Equilibration in the reaction of 175 and 252 MeV /sup 20/Ne with /sup 197/Au. [Energy, element, and angular distributions

    Energy Technology Data Exchange (ETDEWEB)

    Moulton, J.B.

    1978-06-01

    The highly inelastic nuclear reaction of /sup 197/Au with /sup 20/Ne at 175 and 252 MeV laboratory energies is studied. Energy-, elemental-, and angular- distributions for atomic numbers 5 to 30 (175 MeV) or 34 (252 MeV) are presented. The means and widths of the kinetic energy spectra for detected elements are compared with a theoretical calculation. The calculation postulates thermalization of the incident projectile kinetic energy, and includes one sha(e-vibrational degree of freedom and rigid rotation of the reaction complex. The effect of particle evaporation is considered. Good agreement of the expurimental mean energies with the theory is obtained. Poorer agreement of the kinetic energy widths with the theory may be due to a low-temperature quantal effect. The relative elemental yields are analyzed for their degree of equilibration, based on a model of diffusive nucleon exchange as described by the master equation. A similar degree of equilibration is observed for both reaction energies. The absolute elemental yields are reproduced qualitatively by employing an advanced diffusion code, coupled with calculation of the subsequent fission of heavy reaction products, including the compound nucleus. The angular distributions are analyzed with a simple model, to estimate the reaction lifetime of selected elements.

  18. Biogeochemical Controls on Biodegradation of MC252 Oil:Sand Aggregates on a Rapidly Eroding Coastal Headland Beach

    Science.gov (United States)

    Pardue, J.; Elango, V.; Urbano, M.; Lemelle, K.

    2012-12-01

    The research described below was conducted on Fourchon Beach, a coastal headland consisting of nine miles of fairly pristine sandy beaches and dunes, backed by wetlands and tidal channels, located between Belle Pass tidal inlet on the west and Elmer's Island on the east in Lafourche Parish, Louisiana. MC252 oil first arrived in large quantities on Fourchon Beach on or around May 20, 2010. A unique oil form created under these conditions was an aggregate of sand and emulsified oil, typically 0.1-10 cm in diameter, termed small surface residue balls (SSRBs). The work from this project made critical measurements on the factors controlling biodegradability of these SSRB aggregates. SSRB aggregates were sampled across transects perpendicular to the beach from the intertidal to the supratidal. Areas in the supratidal that were sampled initially were set aside for research purposes and not altered by any clean-up activities. Chemical composition of SSRBs was measured including concentrations of n-alkanes, PAHs, hopanes, nutrients (nitrate, nitrite, ammonium and orthophosphate measured on water extracts of SSRBs), and electron acceptor concentrations (O2 microprofiles measured on intact SSRBs and sulfate). Physical characterization of the SSRBs including length and area dimensions, mass, density, porosity, moisture content, and salinity using standard methods. Microbial characterization of SSRBs was also conducted using denaturing gradient gel electrophoresis and sequencing of dominant bands. SSRBs were sampled from various locations across the beach profile deposited by 2 significant tropical events in 2010; Hurricane Alex and TS Bonnie, and one event in 2011, TS Lee. Sampling focused on comparing and contrasting impacts of biogeochemistry on weathering of oil stranded in three beach microenvironments; supratidal surface; subtidal subsurface which is permanently inundated and intertidal subsurface samples which are intermittently inundated. The three types of oil are

  19. A new shipping container for an intense neutron emitter

    Energy Technology Data Exchange (ETDEWEB)

    Bigelow, J.E.; Alexander, C.W.; Pace, J.V. III; Simmons, C.M.

    1994-06-01

    Californium-252 is an intense neutron emitter (2.34 {times} 10{sup 12} n/s{center_dot}g) used in medicine, research, and industry. The western world`s sole source of this rare radioisotope is the Californium Facility at Oak Ridge National Laboratory`s Radiochemical Engineering Development Center (REDC). A project has been initiated at the REDC to design a new Type B Californium Shipping Container. This effort is essential for future transportation of californium to meet the needs of users all over the world. The shipping container must meet all requirements for transport by motor freight, air, vessel, and rail, both domestic and foreign. There are unique problems in the design, fabrication, and licensing of a new Type B shipping container that will accommodate up to 60 milligrams of californium-252. One of the first challenges in the design phase of the project is the selection of a material to shield the high neutron flux. The more stringent safety precautions of today`s world impel us to consider more exotic materials for such a purpose. The candidate materials must be examined not just for their neutron shielding properties, but also in conjunction with other properties such as thermal and structural requirements to withstand the hypothetical accident conditions. The design and building of such a container is a formidable task requiring much planning. The licensing process, with the complex, interactive federal codes, is a special challenge and may be the biggest on the project in terms of time and money.

  20. Effects of low dose rate 60Co γ ray combined with 252Cf neutron irradiation on hematopoietic and antioxidation systems in rats%低剂量率60Co γ射线和252Cf裂变中子混合照射对大鼠造血及抗氧化系统的影响

    Institute of Scientific and Technical Information of China (English)

    莫琳芳; 何颖; 侯登勇; 钱甜甜; 蒋定文; 王岩; 刘玉明; 李珂娴; 王庆蓉

    2013-01-01

    Objective To study the effects of low dose rate 60Co γ ray combined with 252Cf neutron irradiation on hematopoietic and antioxidation systems in rats.Methods Sixteen SD male rats were randomly divided into the irradiation group and the control group,each consisting of 8 rats.The irradiation group was exposed to whole-body 60 Co γray (with daily dose rate of 0.072 Gy) for 1 hour and to 252 Cf neutron (with daily dose rate of 0.085 mGy/h) for 20 hours,for a total of 7 successive days.Peripheral blood cell counts,main organ indices,bone marrow DNA contents,SOD activity and MDA content of rats were monitored,at day 8 after irradiation.Results Compared with those of the control group [(6.2 ± 2.4) × 109/L],WBC of the irradiation group decreased significantly following irradiation [(3.4 ± 1.2) × 109/L],(P < O.05),but no statistical significance could be noted in the changes of various organ indices (P > O.05).Bone marrow DNA contents and serum SOD activity all decreased significantly (P < 0.05),while organ indices and MDA contents seemed to increase,but without statistical significance (P > 0.05).Conclusions 60 Co γirradiation combined with 252Cf neutron irradiation could obviously damage the hemopoietic and anti-oxidation systems of rats.%目的 探讨低剂量率60Co γ射线与252Cf裂变中子混合照射对大鼠的生物效应.方法 16只雄性SD大鼠按数字表法随机分成实验组和对照组,每组8只.实验组每天依次暴露于60Co γ射线1h(剂量率为0.072 Gy/h),252Cf裂变中子20 h(剂量率为0.085 mGy/h),连续7d.照后第8天检测大鼠外周血细胞计数、主要脏器指数、骨髓DNA含量、血清超氧化物歧化酶(SOD)活力及丙二醛(MDA)含量.结果 与对照组[(6.2 ±2.4)×109/L]相比,实验组大鼠外周血白细胞数[(3.4±1.2)×109/L](WBC)显著降低(P<0.05),各项脏器指数变化组间差异无统计学意义(P>0.05),骨髓DNA含量显著降低(P<0.05);血清SOD活力显著降低(P<0

  1. Depletion and biodegradation of hydrocarbons in dispersions and emulsions of the Macondo 252 oil generated in an oil-on-seawater mesocosm flume basin.

    Science.gov (United States)

    Brakstad, Odd G; Daling, Per S; Faksness, Liv-G; Almås, Inger K; Vang, Siv-H; Syslak, Line; Leirvik, Frode

    2014-07-15

    Physically and chemically (Corexit 9500) generated Macondo 252 oil dispersions, or emulsions (no Corexit), were prepared in an oil-on-seawater mesocosm flume basin at 30-32 °C, and studies of oil compound depletion performed for up to 15 days. The use of Corexit 9500 resulted in smaller median droplet size than in a physically generated dispersion. Rapid evaporation of low boiling point oil compounds (C⩽15) appeared in all the experiments. Biodegradation appeared to be an important depletion process for compounds with higher boiling points in the dispersions, but was negligible in the surface emulsions. While n-alkane biodegradation was faster in chemically than in physically dispersed oil no such differences were determined for 3- and 4-ring PAH compounds. In the oil dispersions prepared by Corexit 9500, increased cell concentrations, reduction in bacterial diversity, and a temporary abundance of bacteria containing an alkB gene were associated with oil biodegradation.

  2. Regional assignment of the human uroporphyrinogen III synthase (UROS) gene to chromosome 10q25.2----q26.3.

    Science.gov (United States)

    Astrin, K H; Warner, C A; Yoo, H W; Goodfellow, P J; Tsai, S F; Desnick, R J

    1991-05-01

    Uroporphyrinogen III synthase [UROS; hydroxymethylbilane hydro-lyase (cyclizing), EC 4.2.1.75] is the fourth enzyme in the human heme biosynthetic pathway. The recent isolation of the cDNA encoding human UROS facilitated its chromosomal localization. Human UROS sequences were specifically amplified by the polymerase chain reaction (PCR) from genomic DNA of two independent panels of human-rodent somatic cell hybrids. There was 100% concordance for the presence of the human UROS PCR product and human chromosome 10. For each of the other chromosomes, there was 19%-53% discordance with human UROS. The chromosomal assignment was confirmed by Southern hybridization analysis of DNA from somatic cell hybrids with the full-length UROS cDNA. Using human-rodent hybrids containing different portions of human chromosome 10, we assigned the UROS gene to the region 10q25.2----q26.3.

  3. Large molecular mass materials in coal derived liquids by {sup 252}Cf-plasma and matrix assisted laser desorption mass spectrometry

    Energy Technology Data Exchange (ETDEWEB)

    Domin, M. [School of Pharmacy, London (United Kingdom). Dept. of Pharmaceutical and Biological Chemistry; Li, S.; Herod, A.A.; Larsen, J.W. [Lehigh Univ., Bethlehem, PA (United States). Dept. of Chemistry; Lazaro, M.J.; Kandiyoti, R. [Imperial College, London (United Kingdom). Dept. of Chemical Engineering and Chemical Technology

    1997-12-31

    A Point of Ayr coal extract, its hydrocracked product and the pyridine solubles/insolubles of a coal tar pitch have been examined using {sup 252}Cf-plasma desorption-mass spectrometry (PDMS) and matrix assisted laser desorption-mass spectrometry (MALDI-MS). Comparison of molecular masses (MMs) between the coal extract and its hydrocracked product by PDMS indicated ranges of masses in the product to be considerably smaller, with number and weight average MMs reduced by approximately a factor of two. MALDI-mass spectra of the same samples indicated a greater reduction in mass. Similar comparison of the pyridine soluble/insoluble fractions of the coal tar pitch showed smaller differences by PD-MS than by MALDI-MS. (orig.)

  4. Comparative analysis of bacterial community-metagenomics in coastal Gulf of Mexico sediment microcosms following exposure to Macondo oil (MC252).

    Science.gov (United States)

    Koo, Hyunmin; Mojib, Nazia; Thacker, Robert W; Bej, Asim K

    2014-11-01

    The indigenous bacterial communities in sediment microcosms from Dauphin Island (DI), Petit Bois Island (PB) and Perdido Pass (PP) of the coastal Gulf of Mexico were compared following treatment with Macondo oil (MC252) using pyrosequencing and culture-based approaches. After quality-based trimming, 28,991 partial 16S rRNA sequence reads were analyzed by rarefaction, confirming that analyses of bacterial communities were saturated with respect to species diversity. Changes in the relative abundances of Proteobacteria, Bacteroidetes and Firmicutes played an important role in structuring bacterial communities in oil-treated sediments. Proteobacteria were dominant in oil-treated samples, whereas Firmicutes and Bacteroidetes were either the second or the third most abundant taxa. Tenericutes, members of which are known for oil biodegradation, were detected shortly after treatment, and continued to increase in DI and PP sediments. Multivariate statistical analyses (ADONIS) revealed significant dissimilarity of bacterial communities between oil-treated and untreated samples and among locations. In addition, a similarity percentage analysis showed the contribution of each species to the contrast between untreated and oil-treated samples. PCR amplification using DNA from pure cultures of Exiguobacterium,  Pseudoalteromonas,  Halomonas and Dyadobacter, isolated from oil-treated microcosm sediments, produced amplicons similar to polycyclic aromatic hydrocarbon-degrading genes. In the context of the 2010 Macondo blowout, the results from our study demonstrated that the indigenous bacterial communities in coastal Gulf of Mexico sediment microcosms responded to the MC252 oil with altered community structure and species composition. The rapid proliferation of hydrocarbonoclastic bacteria suggests their involvement in the degradation of the spilt oil in the Gulf of Mexico ecosystem.

  5. Comparative analysis of bacterial community-metagenomics in coastal Gulf of Mexico sediment microcosms following exposure to Macondo oil (MC252)

    KAUST Repository

    Koo, Hyunmin

    2014-09-10

    The indigenous bacterial communities in sediment microcosms from Dauphin Island (DI), Petit Bois Island (PB) and Perdido Pass (PP) of the coastal Gulf of Mexico were compared following treatment with Macondo oil (MC252) using pyrosequencing and culture-based approaches. After quality-based trimming, 28,991 partial 16S rRNA sequence reads were analyzed by rarefaction, confirming that analyses of bacterial communities were saturated with respect to species diversity. Changes in the relative abundances of Proteobacteria, Bacteroidetes and Firmicutes played an important role in structuring bacterial communities in oil-treated sediments. Proteobacteria were dominant in oil-treated samples, whereas Firmicutes and Bacteroidetes were either the second or the third most abundant taxa. Tenericutes, members of which are known for oil biodegradation, were detected shortly after treatment, and continued to increase in DI and PP sediments. Multivariate statistical analyses (ADONIS) revealed significant dissimilarity of bacterial communities between oil-treated and untreated samples and among locations. In addition, a similarity percentage analysis showed the contribution of each species to the contrast between untreated and oil-treated samples. PCR amplification using DNA from pure cultures of Exiguobacterium,  Pseudoalteromonas,  Halomonas and Dyadobacter, isolated from oil-treated microcosm sediments, produced amplicons similar to polycyclic aromatic hydrocarbon-degrading genes. In the context of the 2010 Macondo blowout, the results from our study demonstrated that the indigenous bacterial communities in coastal Gulf of Mexico sediment microcosms responded to the MC252 oil with altered community structure and species composition. The rapid proliferation of hydrocarbonoclastic bacteria suggests their involvement in the degradation of the spilt oil in the Gulf of Mexico ecosystem.

  6. Some characteristics of two azoreductase systems in rat liver. Relevance to the activity of 2-[4'-di(2"-bromopropyl)-aminophenylazo]benzoic acid (CB10-252), a compound possessing latent cytotoxic activity

    DEFF Research Database (Denmark)

    1975-01-01

    monoxide, phenobarbitone (PB), or 3-methylcholanthrene (MC) pretreatment. Enhancement of the activity by ferrous ions and FAD indicated that at least part of the reduction system could involve a flavoprotein with FAD as the prosthetic group. The activity of CB10-252-azoreductase and methylred...

  7. Liver support therapy with molecular adsorbents recirculating system in liver failure:a summary of 252 cases from 14 centers in China

    Institute of Scientific and Technical Information of China (English)

    WANG Min-min; HU Xiao-bin; LUO Hong-tao; LIU Yi-he; WANG Wen-ya; CHEN Shi-jun; YE Qi-fa; YANG Yi-jun; CHEN Shi-bin; ZHOU Xin-min; GUO Li-min; ZHANG Yue-xin; DING Xiao-qiang

    2008-01-01

    Background A liver support therapy,named molecular adsorbents recirculating system (MARS),has been used for more than 700 liver failure patients in China.We made here a summary to evaluate the effects of MARS treatment in different applications with emphasis on hepatitis B virus (HBV) based liver failure.Methods This report analyzed data of 252 patients (mean age (44.9±12.7) years) in three groups:acute severe hepatitis (ASH),subacute severe hepatitis (SSH) and chronic severe hepatitis (CSH).The largest group was CSH (156 patients,61.9%),and 188 patients (74.6%,188/252) were infected with HBV.Results MARS treatments were associated with significant reduction of albumin bound toxins and water-soluble toxins.Most of the patients showed a positive response with a significant improvement of multiple organ function substantiated by a significant increase in prothrombin time activity (PTA) and median arterial pressure (MAP).There was a decrease in hepatic encephalopathy (HE) grade and Child-Turcotte-Pugh (CTP) scale.Thirty-nine of 188 HBV patients (20.7%) dropped out of the commendatory consecutive therapy ending with lower survival of 43.6% while the rest of the 149 patients had a survival rate of 62.4%.Survival within the ASH and SSH groups were 81.2% and 75.0%,respectively.In the CSH group,end stage patients were predominant (65/151,43%),whereas the early and middle stage patients had a better prognosis:early stage survival,including orthotopic liver transplantation (OLT) survival of 91.7%,middle stage survival of 75%,end stage survival of 33.8%.Conclusions MARS continues to be the most favorable extracorporeal treatment for liver support therapy in China for a wide range of conditions,including the majority of hepatitis B related liver failure conditions.The appropriate application of MARS for the right indications and stage of hepatic failure,as well as the fulfillment of prescribed treatments,will lead to the optimal therapeutic result.

  8. Fissible Deposit Characterization at the Former Oak Ridge K-25 Gaseous Diffusion Plant by {sup 252}CF-Source-Driven Measurements

    Energy Technology Data Exchange (ETDEWEB)

    Hannon, T.F.; Mihalczo, J.T.; Mullens, J.A.; Uckan, T.; Valentine, T.E.; Wyatt, M.S.

    1998-05-01

    Laboratory (ORNL) characterize the two largest deposits with the {sup 252}Cf-source-driven transmission (CFSDT) technique, an active neutron interrogation method developed for use at the Oak Ridge Y-12 Plant to identify nuclear weapons components in containers. The active CFSDT measurement technique uses CFSDT time-of-flight measurements of prompt neutrons and gamma rays from an externally introduced {sup 252}Cf source.

  9. Standard test method for nondestructive assay of nuclear material in scrap and waste by passive-Active neutron counting using 252Cf shuffler

    CERN Document Server

    American Society for Testing and Materials. Philadelphia

    2008-01-01

    1.1 This test method covers the nondestructive assay of scrap and waste items for U, Pu, or both, using a 252Cf shuffler. Shuffler measurements have been applied to a variety of matrix materials in containers of up to several 100 L. Corrections are made for the effects of matrix material. Applications of this test method include measurements for safeguards, accountability, TRU, and U waste segregation, disposal, and process control purposes (1, 2, 3). 1.1.1 This test method uses passive neutron coincidence counting (4) to measure the 240Pu-effective mass. It has been used to assay items with total Pu contents between 0.03 g and 1000 g. It could be used to measure other spontaneously fissioning isotopes such as Cm and Cf. It specifically describes the approach used with shift register electronics; however, it can be adapted to other electronics. 1.1.2 This test method uses neutron irradiation with a moveable Cf source and counting of the delayed neutrons from the induced fissions to measure the 235U equiva...

  10. In Plant Measurement and Analysis of Mixtures of Uranium and Plutonium TRU-Waste Using a {sup 252}Cf Shuffler Instrument

    Energy Technology Data Exchange (ETDEWEB)

    Hurd, J.R.

    1998-11-02

    The active-passive {sup 252}Cf shuffler instrument, installed and certified several years ago in Los Alamos National Laboratory's plutonium facility, has now been calibrated for different matrices to measure Waste Isolation Pilot Plant (WIPP)-destined transuranic (TRU)-waste. Little or no data currently exist for these types of measurements in plant environments where sudden large changes in the neutron background radiation can significantly distort the results. Measurements and analyses of twenty-two 55-gallon drums, consisting of mixtures of varying quantities of uranium and plutonium in mostly noncombustible matrices, have been recently completed at the plutonium facility. The calibration and measurement techniques, including the method used to separate out the plutonium component, will be presented and discussed. Calculations used to adjust for differences in uranium enrichment from that of the calibration standards will be shown. Methods used to determine various sources of both random and systematic error will be indicated. Particular attention will be directed to those problems identified as arising from the plant environment. The results of studies to quantify the aforementioned distortion effects in the data will be presented. Various solution scenarios will be outlined, along with those adopted here.

  11. Characterization of pKP-M1144, a Novel ColE1-Like Plasmid Encoding IMP-8, GES-5, and BEL-1 β-Lactamases, from a Klebsiella pneumoniae Sequence Type 252 Isolate.

    Science.gov (United States)

    Papagiannitsis, Costas C; Dolejska, Monika; Izdebski, Radoslaw; Dobiasova, Hana; Studentova, Vendula; Esteves, Francisco J; Derde, Lennie P G; Bonten, Marc J M; Hrabák, Jaroslav; Gniadkowski, Marek

    2015-08-01

    IMP-8 metallo-β-lactamase was identified in Klebsiella pneumoniae sequence type 252 (ST252), isolated in a Portuguese hospital in 2009. blaIMP-8 was the first gene cassette of a novel class 3 integron, In1144, also carrying the blaGES-5, blaBEL-1, and aacA4 cassettes. In1144 was located on a ColE1-like plasmid, pKP-M1144 (12,029 bp), with a replication region of limited nucleotide similarity to those of other RNA-priming plasmids, such as pJHCMW1. In1144 and pKP-M1144 represent an interesting case of evolution of resistance determinants in Gram-negative bacteria.

  12. Subtyping of Non-Small Cell Lung Carcinoma in Fine Needle Aspiration Specimens: A Study of 252 Patients with Surgical Correlations

    Directory of Open Access Journals (Sweden)

    Beyhan Varol Mollamehmetoğlu

    2016-12-01

    Full Text Available Objective: Fine-needle aspiration (FNA cytology performed by either transthoracic or transbronchial procedures is an important approach to obtain tumor tissue for histological diagnosis. We investigated the accuracy of FNA in differentiating NSCLCs of adenocarcinoma from squamous cell carcinoma histological types to correlate cytological findings with histological features and immunohistochemistry confirmation in some cases. Methods: From 2010 to 2015, a total of 635 transbronchial needle aspirations or transthoracic needle aspirations were performed. 332 cases were diagnosed as NSCLC, with or without an indication of a specific subtype, while 303 cases were not diagnosed as NSCLC. Out of 332 cases diagnosed as NSCLC, 252 had a histological follow-up. Subsequently, histological samples included 161 surgical resections and 91 biopsies. In cases with histopathological diagnosis accompanied by FNA cytology, an immunohistochemical study was carried out and the diagnostic results of the two methods were compared to each other. Results: The specific subtype of NSCLC was provided in 217 cases (86% based on cytomorphology which included 115 adenocarcinomas (46% and 102 squamous cell carcinomas (40%. The diagnosis NSCLC-NOS by FNA was set in 35 cases. At histology, 251 cases (99.6% were sub-classified: 122 adenocarcinomas (48%, 104 squamous cell carcinomas (41%, 11 large cell carcinomas (4% , and 14 adenosquamous carcinomas (6%. Agreement between cytological and histological typing was found in 181 of 197 cases (92% (K=0.837; p<0.001. Conclusion: Our study proved that most NSCLC can be sub-classified as adenocarcinoma or squamous cell carcinoma by FNA through cytomorphology and the application of immunocytochemistry.

  13. Large molecular mass materials in coal-derived liquids by {sup 252}Cf-plasma and matrix-assisted laser desorption mass spectrometry

    Energy Technology Data Exchange (ETDEWEB)

    Domin, M.; Li, S.; Lazaro, M.-J.; Herod, A.A.; Larsen, J.W.; Kandiyoti, R. [School of Pharmacy, London (United Kingdom). Dept. of Parmaceutical and Biological Chemistry

    1998-05-01

    The paper compares responses of {sup 252}Cf-plasma desorption MS (PD-MS) and matrix-assisted laser desorption (MALDI) MS to identical samples. The two pairs of samples selected for the comparison were known from previous work to differ significantly in their high mass contents. MALDI-MS showed large differences in MM distributions within both pairs of samples. The PD-MS data showed a degree of similarity between one pair of samples (pyridine soluble/insoluble fractions of a coal tar pitch); for the second pair (a coal extract and its hydrocracked product), trends from the two MS techniques agreed closely. The MM range observed by PD-MS was somewhat narrower, extending to between 3000 and 5000 u. Significant differences within pairs of samples were observed by SEC and by UV-fluorescence spectroscopy, providing somewhat closer agreement with the MALDI spectra. The two MS instruments differ in two important respects: the ionization system (i.e., plasma vs laser desorption) and the maximum available ion extraction voltage: 30 kV for the MALDI-MS instrument and 15 kV for the PD-MS. The comparison of plasma vs laser desorption mass spectroscopy could not therefore take place at high ion extraction voltages. Work at up to 30 kV in the MALDI instrument indicated better sensitivity to high-mass materials at higher ion extraction voltages. The qualitative similarity of results from the two MS techniques is nevertheless apparent; the range of MMs observed in PD-MS as well as in MALDI-MS were, furthermore, far larger than those reported by any MS technique, to date. 38 refs., 6 figs., 1 tab.

  14. In silico analysis of clumping factors ClfA and ClfB of multidrug-resistant Staphylococcus aureus MRSA 252 strain

    Directory of Open Access Journals (Sweden)

    Shilpa M. Deodurg

    2016-09-01

    Full Text Available Infectious diseases cause millions of deaths every year and several gram-positive bacteria such as Staphylococcus aureus, Streptococcus pyogenes and Mycobacterium tuberculosis are the main cause of severe illnesses. S. aureus is a major cause of infection in both healthcare and community settings. S. aureus is equipped with a great variety of virulence factors and carries numerous surface proteins named “microbial surface components recognizing adhesive matrix molecules” (MSCRAMMs that mediate attachment to host tissues exclusively to the gamma-chain of human fibrinogen which induces formation of bacterial clumps and initiate colonization leading to an infection. In the present investigation, in silico analysis of adhesins such as clumping factors A & B (ClfA and ClfB of MRSA 252 was carried out. Primary protein sequence analysis reveals that Clf A & B proteins were acidic in nature having pI value 3.47 & 3.89 respectively. The secondary structure analysis by SOPMA revealed that Clf A & B have less percent of alpha helix than beta sheets and more number of random coils and these proteins belong to serine-aspartate repeat containing protein (SDr family. The domain analysis by SMART showed that ClfA contains YSIRK type signal peptide and SdrG_C_C domain and ClfB contains YSIRK type signal peptide, SdrG_C_C and Gram_pos_anchor domains. Antigenicity of ClfA and ClfB were 1.2023 and 1.0931 respectively was predicted by Vaxijen 2.0 server. The homology modeling of ClfA & B built by SWISS-MODEL was validated using PROCHECK that showed 92.9% and 91.0% model quality respectively. The detailed analysis of function and mechanisms of action of each virulence factor could open the way to control infectious diseases by using specific inhibitors and may be helpful for the development of novel therapies for S. aureus diseases.

  15. 妊娠期高血压疾病252例分析%Analysis of 25 Cases Patient on with Hypertension During Pregnancy

    Institute of Scientific and Technical Information of China (English)

    王秀艳

    2006-01-01

    目的:通过对252例妊娠期高血压疾病分类比较分析,了解新诊断标准的意义及本病对母儿的影响.方法:对2005年1月1日~2006年7月1日在我院住院分娩的孕妇诊断妊娠期高血压疾病,按新诊断标准分类分组:妊娠高血压组、子痫前期轻度组、子痫前期重度组.比较三组间母儿发生早产、胎盘早剥、产后出血、胎儿窘迫、胎儿生长受限(FGR)、新生儿窒息等情况.结果:妊娠高血压组早产、胎儿窘迫的发生率显著低于轻度组,轻度组孕产妇并发症、FGR、围产儿死亡及病率的发生率显著低于重度组(P<0.01).妊娠期高血压组产后出血的发生率低于轻度组,轻度组早产、产后出血、胎儿窘迫、新生儿窒息低于重度组(P<0.05).结论:加强孕期保健,早发现、早治疗,以改善母儿不良结局.

  16. Design of shielding-performance testing-device for reactors construction shielding-material based on 252Cf source%基于252Cf 源的反应堆结构屏蔽材料屏蔽性能测试装置设计

    Institute of Scientific and Technical Information of China (English)

    贺丹; 宋英明; 邹树梁; 徐守龙; 王晓冬; 朱志超; 谭桢干; 何志锋; 王新林

    2015-01-01

    Background: New material for the reactor shielding structure is one type of cast-steel impurity doping actinide elements have been adopted. The design parameters of the shielding performance testing device for the various parts of reactor can be obtained by Monte Carlo method. Purpose: This study aims to test the shielding performance of the shielding material of reactor. Methods: First of all, the testing device model was built based on a 252Cf neutron source. Three kinds of models (the thicknesses of the moderation layer, the protective layers of the neutron and gamma ray) are calculated respectively using the MCNP program for the shielding performance testing device. The GEANT4 program was used for the key moderation layer to verify the results obtained by the MCNP program. Results: Through the analysis of simulation results, we obtained optimal shielding materials and the thicknesses of material layer: moderator layer material is paraffin wax, which having a thickness of 8 cm, neutron shielding material is polyethylene, which having a thickness of 38 cm, and γ protective layer material is iron, which having a thickness of 11 cm. Conclusion: Simulation results show that the proposed shielding performance testing device can meet the requirements of neutron moderator, neutron protection and photon protection.%基于252Cf 中子源,构建了反应堆结构屏蔽材料屏蔽性能测试装置设计模型。采用 MCNP 程序建立了测试模型,并逐次模拟计算屏蔽性能测试装置慢化层、中子防护层、γ光子防护层厚度。对于关键的慢化层,采用 Geant4程序进一步验证 MCNP 程序的计算结果。通过分析模拟计算获得了最优屏蔽材料及厚度分别为:慢化层材料为石蜡,厚度为8 cm;中子防护层材料为聚乙烯,厚度为38 cm;γ防护层材料为铁,厚度为11 cm。模拟实验结果表明,所设计屏蔽性能测试装置能够满足中子慢化以及中子、光子防护的需要。

  17. 1987 Neutron and gamma personnel dosimeter intercomparison study using a D/sub 2/O-moderated /sup 252/Cf source

    Energy Technology Data Exchange (ETDEWEB)

    Swaja, R.E.; West, L.E.; Sims, C.S.; Welty, T.J.

    1989-05-01

    The thirteenth Personnel Dosimetry Intercomparison Study (i.e., PDIS 13) was conducted during April 1987 as a joint effort by Oak Ridge National Laboratory's (ORNL) Dosimetry Applications Research Group and the Southwest Radiation Calibration Center at the University of Arkansas. A total of 48 organizations (34 from the US and 14 from abroad) participated in PDIS 13. Participants submitted a total of 1,113 neutron and gamma dosimeters for this mixed field study. The dosimeters were transferred by mail and were handled by experimental personnel at ORNL and the University of Arkansas. The type of neutron dosimeter and the percentage of participants submitting that type are as follows: TLD-albedo (49%), direct interaction TLD (31%), CR-39 (17%), film (3%). The type of gamma dosimeter and the percentage of participants submitting that type are as follows: Li/sub 2/B/sub 4/O/sub 7/, alone or in combination with CaSO/sub 4/, (69%), /sup 7/LiF (28%), natural LiF (3%). Radiation exposures in PDIS 13 were limited to 0.5 and 1.5 mSv from /sup 252/Cf moderated by 15-cm of D/sub 2/O. Traditional exposures using the Health Physics Research Reactor (HPRR) were not possible due to the fact that all reactors at ORNL, including the HPRR, were shutdown by order of the Department of Energy at the time the intercomparison was performed. Planned exposures using a /sup 238/PuBe source were negated by a faulty timing mechanism. Based on accuracy and precision, direct interaction TLD dosimeters exhibited the best performance in PDIS 13 neutron measurements. They were followed, in order of best performance, by CR-39, TLD albedo, and film. The Li/sub 2/B/sub 4/O/sub 7/ type TLD dosimeters exhibited the best performance in PDIS 13 gamma measurements. They were followed by natural LiF, /sup 7/LiF, and film. 12 refs., 1 fig., 5 tabs.

  18. Distinct difference in relative biological effectiveness of {sup 252}Cf neutrons for the induction of mitotic crossing over and intragenic reversion of the white-ivory allele in Drosophila melanogaster

    Energy Technology Data Exchange (ETDEWEB)

    Yoshikawa, Isao [Department of Genetics, Nagasaki University School of Medicine, Nagasaki (Japan); Hoshi, Masaharu [International Radiation Information Center, Research Institute for Nuclear Medicine and Biology, Hiroshima University, Hiroshima (Japan); Ikenaga, Mituo [Radiation Biology Center, Kyoto University, Kyoto (Japan)

    1996-10-25

    The relative biological effectiveness (RBE) of {sup 252}Cf neutrons was determined for two different types of somatic mutations, i.e., loss of heterozygosity for wing-hair mutations and reversion of the mutant white-ivory eye-color, in Drosophila melanogaster. Loss of heterozygosity for wing-hair mutations results predominantly from mitotic crossing over induced in wing anlage cells of larvae, while the reverse mutation of eye-color is due to an intragenic structural change in the white locus on the X-chromosome. For a quantitative comparison of RBE values for these events, we have constructed a combined mutation assay system so that induced mutant wing-hair clones as well as revertant eye-color clones can be detected simultaneously in the same individuals. Larvae were irradiated at the age of 80{+-}4 h post-oviposition with {sup 252}Cf neutrons or {sup 137}Cs {gamma}-rays, and male adult flies were examined under the microscope for the presence of the two types of clonal mosaic spots appearing. The induction of wing-hair spots per dose unit was much greater for {sup 252}Cf neutrons than for {sup 137}Cs {gamma} -rays, whereas the frequencies of eye-color reversion were similar for neutrons and {gamma}-rays. The estimated RBE values of neutrons were 8.5 and 1.2 for the induction of mutant wing-hair spots and revertant eye-color spots, respectively. These results indicate that the RBE of neutrons is much greater for mitotic crossing over in comparison to the intragenic white-ivory reversion events. Possible causes for the difference in RBE are discussed.

  19. LW10B-252型断路器机构油压对同期性及分、合闸时间的影响%Mechanism Oil-pressure's Effect on Closing/opening Simultaneityand Time of LW10B-252 Circuit Breaker

    Institute of Scientific and Technical Information of China (English)

    石锋杰; 郭琳; 李芳

    2012-01-01

    Non-simultaneous opening or closing of the three phases of circuit breaker can lead to a short time open-phase operation in power system, and perhaps causes neutral point voltage displacement or overvoltage, prolong thereclosing time delay, and is disadvantage to the stability of power system. This paper analyses the relationship betweenoil-pressures in the latching range of hydraulic system and closing/opening time, and the effect on the opening or closingsimultaneity.%分、合闸不同期,将使系统在短时间内处于非全相运行,可能会引起中性点电压位移、过电压、加大重合闸时间,对系统稳定性不利.本文对LW 10B-252型断路器进行试验,分析了液压系统油压在闭锁范围内和分合闸时间的关系以及对同期性分合闸的影响.

  20. Measurement of the ambient gamma dose equivalent and kerma from the small 252Cf source at 1 meter and the small 60Co source at 2 meters

    Energy Technology Data Exchange (ETDEWEB)

    Carl, W. F. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

    2015-07-30

    NASA Langley Research Center requested a measurement and determination of the ambient gamma dose equivalent rate and kerma at 100 cm from the 252Cf source and determination of the ambient gamma dose equivalent rate and kerma at 200 cm from the 60Co source for the Radiation Budget Instrument Experiment (Rad-X). An Exradin A6 ion chamber with Shonka air-equivalent plastic walls in combination with a Supermax electrometer were used to measure the exposure rate and free-in-air kerma rate of the two sources at the requested distances. The measured gamma exposure, kerma, and dose equivalent rates are tabulated.

  1. Measurement of the energy spectra of fission fragments using nuclear track detectors and digital image processing

    Energy Technology Data Exchange (ETDEWEB)

    Espinosa, Guillermo; Golzarri, Jose I. [Instituto de Fisica, Universidad Nacional Autonoma de Mexico, A.P. 20-364, Mexico D.F. 01000 (Mexico); Castano, Victor M., E-mail: castano@fata.unam.m [Centro de Fisica Aplicada y Tecnologia Avanzada, Universidad Nacional Autonoma de Mexico, Boulevard Juriquilla 3001, Santiago de Queretaro, Queretaro 76230 (Mexico)

    2010-08-15

    Energy spectra of fission fragments were determined using a Nuclear Track Methodology (NTM) supported by digital image analysis and numerical data processing using a standard personal computer. The analysis of a californium ({sup 252}Cf) spectrum with this approach shows improvement compared with the values reported previously using the standard procedure, in terms of resolution and accuracy. This new method adds full automation to the technical advantages and cost effectiveness of an NTM.

  2. Mutation analysis of KRAS, NRAS, BRAF and PIK3CA genes in 252 cases of colorectal cancer tissues%252例结直肠癌组织中KRAS、NRAS、 BRAF、PIK3CA的基因突变分析

    Institute of Scientific and Technical Information of China (English)

    刘影; 郑细闰; 朱亚珍; 何青莲; 郑广娟

    2016-01-01

    目的 分析结直肠癌(colorectal cancer,CRC)组织中KRAS、NRAS、BRAF和PIK3CA基因的常见突变类型及其与临床病理指标的关系.方法 对252例CRC石蜡包埋组织进行DNA提取,采用Sanger测序法对KRAS、NRAS、BRAF和PIK3CA基因进行检测,分析各个基因的突变率与临床病理特征的关系,并统计各个基因的突变类型.结果 252例CRC中,KRAS、BRAF、NRAS和PIK3CA突变发生率在性别、年龄、肿瘤部位、病理分期和有无淋巴结转移上差异均无统计学意义(P>0.05);检测阳性突变共140例(55.5%),其中KRAS 113例(44.8%),NRAS 1例(0.4%),BRAF 19例(7.5%),PIK3CA 28例(11.1%),包括PIK3 CA与KRAS、NRAS、BRAF基因发生双突变21例(8.3%);KRAS的主要突变类型包括G12A、G12C、G12D、G12R、G12S、G12V、G13D、T20M、A59T、Q61H、Q61L、Q61P;NRAS仅有1例突变为G12D;BRAF的主要突变类型为V600E、D594G、K601E;PIK3CA的主要突变类型包括E542K、E545K、Q546K、Q546P、Q546R、M1043I、H1047R.PIK3CA与KRAS、NRAS、BRAF之间会发生交叉突变,但KRAS、NRAS、BRAF三者之间基本不存在交叉突变.结论 CRC中KRAS阳性突变率居高,PIK3CA次之,BRAF、NRAS突变率最低,且PIK3CA常与KRAS、NRAS、BRAF发生交叉突变.对CRC患者行KRAS、NRAS、BRAF、PIK3CA等多基因检测,可正确指导并选择抗EGFR单抗药,从而实现真正意义上的个体化靶向治疗.

  3. 252株肺炎克雷伯菌耐药率与抗菌药物使用强度相关性分析%Correlation between Drug-Resistant Rates in 252 Strains of Klebsiella pneumoniae and An-tibacterial Use Density

    Institute of Scientific and Technical Information of China (English)

    忻志鸣; 叶根深; 牛洪敏

    2014-01-01

    Objective To investigate the correlation between the drug-resistant rates of Klebsiella pneumoniae(Kp)and antibacterial use density(AUD)to provide the basis for the reasonable use of antibacterial drugs in clinic. Methods The drug-resistant rates of Kp in de-tected 252 strains of Kp during 2012 were summarized and statistically analyzed,which was combined with contemporaneous AUD for ana-lyzing the correlation between them;the difference of resistant rates of Kp to different categories of antibacterial drugs was statistically ana-lyzed. Results The drug-resistant rate of Kp exhibited extremely significant positive correlation with AUD. The resistant rates of Kp to dif-ferent categories of antibacterial drugs were different,the difference of resistant rate to aminoglycosides and fluoroquinolones had no statistical significance,the resistant rate to broad spectrum penicillins was highest and which to carbapenems and cephalosporins containing enzyme in-hibitors was lowest. Conclusion The drug-resistant rate of Kp is correlated with AUD. Clinic may give preference to cephalosporins con-taining enzyme inhibitors,aminoglycosides,fluoroquinolones and carbapenems and suspends the use of broad-spectrum penicillins.%目的:探讨医院肺炎克雷伯菌耐药率与抗菌药物使用强度的相关性,为临床合理使用抗菌药物提供依据。方法统计医院2012年检出的252株肺炎克雷伯菌的耐药率,结合同期抗菌药物使用强度,分析两者相关性;分析肺炎克雷伯菌对不同类别抗菌药物耐药率的差异。结果肺炎克雷伯菌的耐药率与抗菌药物的使用强度呈极显著线性正相关关系;对不同类别抗菌药物的耐药率不尽相同,对氨基苷类和喹诺酮类的耐药率差异无显著性,对广谱青霉素类的耐药率最高,对碳青霉烯类、含酶抑制剂头孢类的耐药率最低。结论肺炎克雷伯菌耐药率与抗菌药物的使用强度有关,临床可酌情优选含酶

  4. Response function and relative efficiency measurements of the BC501A scintillator by using a 252 Cf fast fission chamber%利用252Cf快裂变室测量BC501A液闪探测器的相对探测效率和响应函数

    Institute of Scientific and Technical Information of China (English)

    言杰; 李澄; 刘荣; 蒋励; 鹿心鑫; 王玫

    2011-01-01

    The response function and relative efficiency of a φ50.8 mm × 50.8 mm BC501A scintillator has been measured by using a252Cf fast fission chamber.In this method, a multi-parameter data acquisition system is employed to take the time-of-flight (TOF) ,pulse shape discrimination (PSD) and recoil energy (RE.note: fission neutron induces recoil proton while the prompt gamma ray induces Compton recoil electron) of the fission neutron and prompt gamma ray in an event-by-event mode with a TOF gate.The off-line data analysis method for separating the prompt gamma ray from the fission neutron as well as its contribution to the TOF spectrum and RE spectrum to obtain the relative efficiency and response function is discussed in detail.An accurate calibration of the effective neutron detection threshold is carried out by a linear extrapolation of the section around the point of infiexion in the relative efficiency plots using neutron energy directly.The relative efficiency with 0.51 MeV effective neutron detection threshold agrees with the Monte Carlo calculation result of NEFF.The response function from 0.5 MeV to 5 MeV generally agrees with the published experimental result of the NE213 scintillator of the same size.%本文利用252Cf快裂变室和多参数数据采集系统,逐事例的同时记录了自发裂变中子和瞬发伽马的飞行时间(TOF),脉冲形状甄别(PSD)和反冲能量(RE,裂变中子是通过测量反冲质子;瞬发伽马是通过测量康普顿反冲电子)三维信息.详细介绍了通过离线数据分析完全扣除三维信息中的伽马事例贡献,以获得φ50.8 mm×50.8 mm的BC501A液闪探测器的相对探测效率和响应函数的方法.在不通过探测器响应函数进行数据转换的条件下,利用中子的能量直接确定了中子的有效测量阈值.得到的中子有效测量阈值为0.51 MeV的相对探测效率实验结果与NEFF程序计算的结果一致.探测器在0.5-5 MeV的响应函数也与

  5. Advanced development of the spectrum sciences Model 5005-TF, single-event test fixture

    Energy Technology Data Exchange (ETDEWEB)

    Ackermann, M.R.; Browning, J.S. (Sandia National Labs., Albuquerque, NM (USA)); Hughlock, B.W. (Boeing Aerospace and Electronics Co., Seattle, WA (USA)); Lum, G.K. (Lockheed Missiles and Space Co., Sunnyvale, CA (USA)); Tsacoyeanes, W.C. (Draper (Charles Stark) Lab., Inc., Cambridge, MA (USA)); Weeks, M.D. (Spectrum Sciences, Inc., Santa Clara, CA (USA))

    1990-09-01

    This report summarizes the advanced development of the Spectrum Sciences Model 5005-TF, Single-Event Test Fixture. The Model 5005-TF uses a Californium-252 (Cf-252) fission-fragment source to test integrated circuits and other devices for the effects of single-event phenomena. Particle identification methods commonly used in high-energy physics research and nuclear engineering have been incorporated into the Model 5005-TF for estimating the particle charge, mass, and energy parameters. All single-event phenomena observed in a device under test (DUT) are correlated with an identified fission fragment, and its linear energy transfer (LET) and range in the semiconductor material of the DUT.

  6. Measurement of Inclusive ep Cross Sections at High Q2 at sqrt(s) = 225 and 252 GeV and of the Longitudinal Proton Structure Function FL at HERA

    CERN Document Server

    Andreev, V.; Baghdasaryan, S.; Begzsuren, K.; Belousov, A.; Belov, P.; Boudry, V.; Brandt, G.; Brinkmann, M.; Brisson, V.; Britzger, D.; Buniatyan, A.; Bylinkin, A.; Bystritskaya, L.; Campbell, A.J.; Cantun Avila, K.B.; Ceccopieri, F.; Cerny, K.; Chekelian, V.; Contreras, J.G.; Dainton, J.B.; Daum, K.; De Wolf, E.A.; Diaconu, C.; Dobre, M.; Dodonov, V.; Dossanov, A.; Dubak, A.; Eckerlin, G.; Egli, S.; Elsen, E.; Favart, L.; Fedotov, A.; Feltesse, J.; Ferencei, J.; Fleischer, M.; Fomenko, A.; Gabathuler, E.; Gayler, J.; Ghazaryan, S.; Glazov, A.; Goerlich, L.; Gogitidze, N.; Gouzevitch, M.; Grab, C.; Grebenyuk, A.; Greenshaw, T.; Grindhammer, G.; Habib, S.; Haidt, D.; Henderson, R.C.W.; Herbst, M.; Hildebrandt, M.; Hladky, J.; Hoffmann, D.; Horisberger, R.; Hreus, T.; Huber, F.; Jacquet, M.; Janssen, X.; Jung, A.W.; Jung, H.; Kapichine, M.; Kiesling, C.; Klein, M.; Kleinwort, C.; Kogler, R.; Kostka, P.; Kretzschmar, J.; Kruger, K.; Landon, M.P.J.; Lange, W.; Laycock, P.; Lebedev, A.; Levonian, S.; Lipka, K.; List, B.; List, J.; Lobodzinski, B.; Lubimov, V.; Malinovski, E.; Martyn, H.U.; Maxfield, S.J.; Mehta, A.; Meyer, A.B.; Meyer, H.; Meyer, J.; Mikocki, S.; Morozov, A.; Muller, K.; Naumann, Th.; Newman, P.R.; Niebuhr, C.; Nowak, G.; Nowak, K.; Olivier, B.; Olsson, J.E.; Ozerov, D.; Pahl, P.; Pascaud, C.; Patel, G.D.; Perez, E.; Petrukhin, A.; Picuric, I.; Pirumov, H.; Pitzl, D.; Placakyte, R.; Pokorny, B.; Polifka, R.; Radescu, V.; Raicevic, N.; Raspereza, A.; Ravdandorj, T.; Reimer, P.; Rizvi, E.; Robmann, P.; Roosen, R.; Rostovtsev, A.; Rotaru, M.; Rusakov, S.; Salek, D.; Sankey, D.P.C.; Sauter, M.; Sauvan, E.; Schmitt, S.; Schoeffel, L.; Schoning, A.; Schultz-Coulon, H.C.; Sefkow, F.; Shushkevich, S.; Soloviev, Y.; Sopicki, P.; South, D.; Spaskov, V.; Specka, A.; Steder, M.; Stella, B.; Straumann, U.; Sykora, T.; Thompson, P.D.; Traynor, D.; Truol, P.; Tsakov, I.; Tseepeldorj, B.; Turnau, J.; Valkarova, A.; Vallee, C.; Van Mechelen, P.; Vazdik, Y.; Wegener, D.; Wunsch, E.; Zacek, J.; Zhang, Z.; Zlebcik, R.; Zohrabyan, H.; Zomer, F.

    2014-01-01

    Inclusive ep double differential cross sections for neutral current deep inelastic scattering are measured with the H1 detector at HERA. The data were taken with a lepton beam energy of 27.6 GeV and two proton beam energies of Ep = 460 and 575 GeV corresponding to centre-of-mass energies of 225 and 252 GeV, respectively. The measurements cover the region of 6.5 *10^{-4}<=x<= 0.65 for 35<=Q^2<=800 GeV^2 up to y = 0.85. The measurements are used together with previously published H1 data at Ep = 920 GeV and lower Q2 data at Ep = 460, 575 and 920 GeV to extract the longitudinal proton structure function FL in the region 1.5<=Q^2 <=800 GeV^2.

  7. In 252 Cf neutron brachytherapy for uterine cervical cancer: the comparison of absorbed dose at anterior rectal wall with shielding by barium enema or lead marker%252Cf中子后装治疗宫颈癌直肠钡灌肠与插铅丝监测直肠前壁受量的差异

    Institute of Scientific and Technical Information of China (English)

    雷新; 单锦露; 赵可伟

    2005-01-01

    目的观察宫颈癌锎(252Cf)中子后装治疗过程中直肠钡灌肠与插铅丝两种方法监测直肠前壁受量时的差异,分析直肠前壁受量的高低与急性期放射性直肠炎发生率的关系.方法30例宫颈癌用直肠插铅丝和钡灌肠的办法监测直肠前壁受量(各15例),分别拍摄等中心正交片.A点剂量均给予10Gy,分别计算直肠前壁和膀胱后壁最大受量以及按ICRU38号报告设定的直肠剂量参考点(R)的剂量,量取直肠前壁和膀胱后壁最大剂量点与官腔管中心的距离.统计所有病例及其中直肠前壁受量>4Gy病例的急性放射性直肠炎的发生率.结果钡灌肠组直肠前壁最大剂量点与宫腔管中心的平均距离明显低于插铅丝组,钡灌肠组直肠前壁最大剂量点受量则明显高于插铅丝组,ICRU直肠剂量参考点(R)的剂量明显高于钡灌肠组,但其剂量的高低与钡灌肠时直肠前壁最大剂量点受量的高低无明显关系.而膀胱后壁最大剂量点与宫腔管中心的平均距离及膀胱后壁最大剂量点受量,两组均无明显差别.直肠前壁受量>4 Gy病例的急性放射性直肠炎的发生率明显高于其他病例.结论宫颈癌中子后装治疗时直肠钡灌肠比插铅丝更能准确显示宫颈、阴道与直肠前壁的解剖关系,更能准确反映直肠前壁的真正受量.根据钡灌肠时直肠前壁最大剂量点受量的高低可大致预测宫颈癌放疗期间急性放射性直肠炎的发生率,且直肠钡灌肠对乙状结肠变异可起诊断作用.

  8. Measurement of inclusive ep cross sections at high Q{sup 2} at √(s) = 225 and 252 GeV and of the longitudinal proton structure function F{sub L} at HERA

    Energy Technology Data Exchange (ETDEWEB)

    Andreev, V.; Belousov, A.; Fomenko, A.; Gogitidze, N.; Lebedev, A.; Malinovski, E.; Rusakov, S.; Vazdik, Y. [Lebedev Physical Institute, Moscow (Russian Federation); Baghdasaryan, A.; Baghdasaryan, S.; Zohrabyan, H. [Yerevan Physics Institute, Yerevan (Armenia); Begzsuren, K.; Ravdandorj, T.; Tseepeldorj, B. [Institute of Physics and Technology of the Mongolian Academy of Sciences, Ulaanbaatar (Mongolia); Belov, P.; Brinkmann, M.; Britzger, D.; Campbell, A.J.; Dodonov, V.; Eckerlin, G.; Elsen, E.; Fleischer, M.; Gayler, J.; Ghazaryan, S.; Glazov, A.; Gouzevitch, M.; Grebenyuk, A.; Habib, S.; Haidt, D.; Kleinwort, C.; Krueger, K.; Levonian, S.; Lipka, K.; List, B.; List, J.; Lobodzinski, B.; Meyer, A.B.; Meyer, J.; Niebuhr, C.; Olsson, J.E.; Ozerov, D.; Pahl, P.; Petrukhin, A.; Pirumov, H.; Pitzl, D.; Placakyte, R.; Radescu, V.; Raspereza, A.; Schmitt, S.; Sefkow, F.; Shushkevich, S.; South, D.; Steder, M.; Wuensch, E. [DESY, Hamburg (Germany); Boudry, V.; Specka, A. [LLR, Ecole Polytechnique, CNRS/IN2P3, Palaiseau (France); Bradt, G. [Oxford University, Department of Physics, Oxford (United Kingdom); Brisson, V.; Jacquet, M.; Pascaud, C.; Zhang, Z.; Zomer, F. [LAL, Universite Paris-Sud, CNRS/IN2P3, Orsay (France); Buniatyan, A.; Huber, F.; Sauter, M.; Schoening, A. [Universitaet Heidelberg, Physikalisches Institut, Heidelberg (Germany); Bylinkin, A.; Bystritskaya, L.; Fedotov, A.; Rostovtsev, A. [Institute for Theoretical and Experimental Physics, Moscow (Russian Federation); Cantun Avila, K.B.; Contreras, J.G. [CINVESTAV, Departamento de Fisica Aplicada, Merida, Yucatan (Mexico); Ceccopieri, F.; Wolf, E.A. de; Favart, L.; Hreus, T.; Janssen, X.; Roosen, R.; Mechelen, P. van [Brussels and Universiteit Antwerpen, Inter-University Institute for High Energies ULB-VUB, Antwerp (Belgium); Cerny, K.; Pokorny, B.; Polifka, R.; Salek, D.; Valkarova, A.; Zacek, J.; Zlebcik, R. [Charles University, Faculty of Mathematics and Physics, Prague (Czech Republic); Chekelian, V.; Grindhammer, G.; Kiesling, C.; Olivier, B. [Max-Planck-Institut fuer Physik, Munich (Germany); Dainton, J.B.; Gabathuler, E.; Greenshaw, T.; Klein, M.; Kretzschmar, J.; Laycock, P.; Maxfield, S.J.; Mehta, A.; Patel, G.D. [University of Liverpool, Department of Physics, Liverpool (United Kingdom); Daum, K.; Meyer, H. [Universitaet Wuppertal, Fachbereich C, Wuppertal (Germany); Diaconu, C.; Hoffmann, D.; Sauvan, E.; Vallee, C. [CPPM, Aix-Marseille Univ, CNRS/IN2P3, Marseille (France); Dobre, M.; Rotaru, M. [National Institute for Physics and Nuclear Engineering (NIPNE), Bucharest (Romania); Dossanov, A. [Universitaet Hamburg, Institut fuer Experimentalphysik, Hamburg (Germany); Max-Planck-Institut fuer Physik, Munich (Germany); Dubak, A. [Max-Planck-Institut fuer Physik, Munich (Germany); University of Montenegro, Faculty of Science, Podgorica (Montenegro); Egli, S.; Hildebrandt, M.; Horisberger, R. [Paul Scherrer Institut, Villigen (Switzerland); Feltesse, J.; Perez, E.; Schoeffel, L. [CEA, DSM/Irfu, CE-Saclay, Gif-sur-Yvette (France); Ferencei, J. [Slovak Academy of Sciences, Institute of Experimental Physics, Kosice (Slovakia); Goerlich, L.; Mikocki, S.; Nowak, G.; Sopicki, P.; Turnau, J. [Institute for Nuclear Physics, Cracow (Poland); Grab, C. [ETH, Institut fuer Teilchenphysik, Zurich (Switzerland); Henderson, R.C.W. [University of Lancaster, Department of Physics, Lancaster (United Kingdom); Herbst, M.; Jung, A.W.; Schultz-Coulon, H.C. [Universitaet Heidelberg, Kirchhoff-Institut fuer Physik, Heidelberg (Germany); Hladka, J.; Reimer, P. [Academy of Sciences of the Czech Republic, Institute of Physics, Prague (Czech Republic); Jung, H. [Brussels and Universiteit Antwerpen, Inter-University Institute for High Energies ULB-VUB, Antwerp (Belgium); DESY, Hamburg (Germany); Kapichine, M.; Morozov, A.; Spaskov, V. [Joint Institute for Nuclear Research, Dubna (RU); Kogler, R.; Nowak, K. [Universitaet Hamburg, Institut fuer Experimentalphysik, Hamburg (DE); Kostka, P.; Lange, W.; Naumann, T. [DESY, Zeuthen (DE); Landon, M.P.J.; Rizvi, E.; Traynor, D. [University of London, School of Physics and Astronomy, Queen Mary, London (GB); Lubimov, V. [Institute for Theoretical and Experimental Physics, Moscow (RU); Martyn, H.U. [I. Physikalisches Institut der RWTH, Aachen (DE); Mueller, K.; Robmann, P.; Straumann, U.; Truoel, P. [Physik-Institut der Universitaet Zuerich, Zurich (CH); Newman, P.R.; Thompson, P.D. [School of Physics and Astronomy, University of Birmingham, Birmingham (GB); Picuric, I.; Raicevic, N. [University of Montenegro, Faculty of Science, Podgorica (ME); Sankey, D.P.C. [STFC, Rutherford Appleton Laboratory, Oxfordshire (GB); Soloviev, Y. [DESY, Hamburg (DE); Lebedev Physical Institute, Moscow (RU); Stella, B. [Universita di Roma Tre (IT); INFN Roma 3, Dipartimento di Fisica, Rome (IT); Sykora, T. [Brussels and Universiteit Antwerpen, Inter-University Institute for High Energies ULB-VUB, Antwerp (BE); Charles University, Faculty of Mathematics and Physics, Prague (CZ); Tsakov, I. [Institute for Nuclear Research and Nuclear Energy, Sofia (BG); Wegener, D. [Institut fuer Physik, TU Dortmund, Dortmund (DE); Collaboration: H1 Collaboration

    2014-04-15

    Inclusive ep double differential cross sections for neutral current deep inelastic scattering are measured with the H1 detector at HERA.The data were taken with a lepton beam energy of 27.6 GeV and two proton beam energies of E{sub p} = 460 and 575 GeV corresponding to centre-of-mass energies of 225 and 252 GeV, respectively. The measurements cover the region of 6.5 x 10{sup -4} ≤ x ≤ 0.65 for 35 ≤ Q{sup 2} ≤ 800 GeV{sup 2} up to y = 0.85. The measurements are used together with previously published H1 data at E{sub p} = 920 GeV and lower Q{sup 2} data at E{sub p} = 460, 575 and 920 GeV to extract the longitudinal proton structure function F{sub L} in the region 1.5 ≤ Q{sup 2} ≤ 800 GeV{sup 2}. (orig.)

  9. 15 CFR 25.2 - Definitions.

    Science.gov (United States)

    2010-01-01

    ... context otherwise requires, anything of value, including but not limited to any advantage, preference.... Statement means any representation, certification, affirmation, document, record, or accounting...

  10. 17 CFR 230.252 - Offering statement.

    Science.gov (United States)

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    ..., language and pagination. The requirements for offering statements are the same as those specified in § 230... Officer, a majority of the members of its board of directors or other governing body, and each selling... that contains the following language: This offering statement shall become qualified on the...

  11. 7 CFR 764.252 - Eligibility requirements.

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    2010-01-01

    ... exception. (d) And in the case of an entity, the entity must be: (1) Controlled by farmers engaged primarily... anyone who will sign the promissory note is a beginning farmer. (2) This limitation does not apply if the... security instruments subject to the jurisdiction of an Indian tribe, and commercial credit is generally...

  12. 18 CFR 25.2 - Hearings.

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    2010-04-01

    ... classified as power sites, such reservation or classification being made solely because such lands are either... be established and such permits and leases for grazing permits issued subject to the following conditions: (1) That the establishment of the grazing district or the issuance of the grazing permit or...

  13. 7 CFR 252.6 - Miscellaneous provisions.

    Science.gov (United States)

    2010-01-01

    ... verification sample to the total NCP sales reported by the processor. (d) Sanctions. Any processor or recipient... the Department, be disqualified from further participation in the NCP Program. Reinstatement may be... misapplies, steals, or obtains by fraud commodities donated for use in the NCP Program, or any funds,...

  14. 6 CFR 25.2 - Definitions.

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    2010-01-01

    ... “OSAI” means the office within the Department of Homeland Security's Directorate of Science and... Science and Technology, SAFETY Act/room 4320, Department of Homeland Security, Washington, DC 20528... information and projections, actuarial calculations, liability estimates, insurance quotations, and...

  15. Reference: 252 [Arabidopsis Phenome Database[Archive

    Lifescience Database Archive (English)

    Full Text Available s were modestly sensitive to exogenous Ca2+ and also displayed a 22% reduction in vacuolar H+-ATPase activit...y. cax1/cax3 double mutants displayed a severe reduction in growth, including leaf tip and flower necrosis a...y addition of exogenous Mg2+. The double mutant displayed a 42% decrease in vacuo...e modestly perturbed, the cax1/cax3 lines displayed increased PO4(3-), Mn2+, and Zn2+ and decreased Ca2+ and

  16. BDML Metadata: 252 [SSBD[Archive

    Lifescience Database Archive (English)

    Full Text Available b0-5fef-4e7a-ae16-30a1dc42b18a 0.105 x 0.105 x 0.5 (micrometer), 40 (second) http://ssbd.qbic.riken.jp/data/...source/Ce_KK_P002/RNAi_Y43F4B.6_061214_03/ http://ssbd.qbic.riken.jp/data/bdml/Ce..._KK_P002/RNAi_Y43F4B.6_061214_03.bdml0.15.xml http://ssbd.qbic.riken.jp/data/pdpml/Ce_KK_P002.pdpml0.05.xml ...http://ssbd.qbic.riken.jp/search/f9cae7b0-5fef-4e7a-ae16-30a1dc42b18a/ http://ssbd.qbic.riken.jp/omero/webclient/?show=dataset-206 ...

  17. 36 CFR 25.2 - License.

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    2010-07-01

    ... desire a shortened tour, to arrange for such service as may suit their convenience. 8. (a) Not to operate... motor vehicle operator's license issued by the State in which the national military park is located....

  18. 29 CFR 1910.252 - General requirements.

    Science.gov (United States)

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    ....133(b)(1). (iii) Protection from arc welding rays. Where the work permits, the welder should be... is incorporated by reference as specified in § 1910.6. (vii) X-ray inspection. The use of X-rays and... American National Standard Safety Standard for Non-Medical X-ray and Sealed Gamma-Ray Sources, ANSI...

  19. 40 CFR 25.2 - Scope.

    Science.gov (United States)

    2010-07-01

    ... Environment ENVIRONMENTAL PROTECTION AGENCY GENERAL PUBLIC PARTICIPATION IN PROGRAMS UNDER THE RESOURCE... informational materials, such as citizen guides or handbooks, which are expected to be used over several years... concerning public participation. These are found elsewhere in this chapter in provisions which apply to...

  20. NONDESTRUCTIVE IDENTIFICATION OF CHEMICAL WARFARE AGENTS AND EXPLOSIVES BY NEUTRON GENERATOR-DRIVEN PGNAA

    Energy Technology Data Exchange (ETDEWEB)

    T. R. Twomey; A. J. Caffrey; D. L. Chichester

    2007-02-01

    Prompt gamma-ray neutron activation analysis (PGNAA) is now a proven method for the identification of chemical warfare agents and explosives in military projectiles and storage containers. Idaho National Laboratory is developing a next-generation PGNAA instrument based on the new Ortec Detective mechanically-cooled HPGe detector and a neutron generator. In this paper we review PGNAA analysis of suspect chemical warfare munitions, and we discuss the advantages and disadvantages of replacing the californium-252 radioisotopic neutron source with a compact accelerator neutron generator.

  1. Optical transitions in highly charged californium ions with high sensitivity to variation of the fine-structure constant.

    Science.gov (United States)

    Berengut, J C; Dzuba, V A; Flambaum, V V; Ong, A

    2012-08-17

    We study electronic transitions in highly charged Cf ions that are within the frequency range of optical lasers and have very high sensitivity to potential variations in the fine-structure constant, α. The transitions are in the optical range despite the large ionization energies because they lie on the level crossing of the 5f and 6p valence orbitals in the thallium isoelectronic sequence. Cf(16+) is a particularly rich ion, having several narrow lines with properties that minimize certain systematic effects. Cf(16+) has very large nuclear charge and large ionization energy, resulting in the largest α sensitivity seen in atomic systems. The lines include positive and negative shifters.

  2. Alternative synthetic route for the heterometallic CO-releasing [Sb@Rh12(CO)27]3-icosahedral carbonyl cluster and synthesis of its new unsaturated [Sb@Rh12(CO)24]4-and dimeric [{Sb@Rh12Sb(CO)25}2Rh(CO)2PPh3]7-derivatives

    Institute of Scientific and Technical Information of China (English)

    Cristina Femoni; Iacopo Ciabatti; Maria Carmela Iapalucci; Silvia Ruggieri; Stefano Zacchini

    2016-01-01

    The hetero-metallic [Sb@Rh12(CO)27]3−cluster has been known as for over three decades thanks to Vidal and co-workers, and represents the first example of an E-centered (E=heteroatom) icosahedral rhodium carbonyl cluster. However, its synthesis required high temperature (140–160 °C) and elevated CO pressure (400 atm). Applying the redox condensation method for cluster preparation, we herein report a new synthetic, high-yield route for preparing [Sb@Rh12(CO)27]3−under much milder conditions of temperature and pressure. Notably, when the same synthesis was carried out under N2 instead of CO atmosphere, the new isostructural but unsaturated derivative [Sb@Rh12(CO)24]4− was obtained, for which we report the full X-ray structural characterization. This species represents one of the few examples of an icosahedral cluster disobeying the electron-counting Wade-Mingos rules, possessing less than the expected 170 cluster valence electrons (CVEs). Judging from IR monitoring, the two species can be obtained one from the other by switching between N2 and CO atmosphere, making [Sb@Rh12(CO)27]3− a spontaneous CO-releasing molecule. Finally, the study of the chemical reactivity of [Sb@Rh12(CO)27]3− with PPh3 allowed us to obtain the new [{Sb@Rh12Sb(CO)25}2Rh(CO)2PPh3]7− dimeric compound, for which we herein report the full X-ray structural and 31P NMR analyses.

  3. Alternative synthetic route for the heterometallic CO-releasing [Sb@Rh12(CO27]3− icosahedral carbonyl cluster and synthesis of its new unsaturated [Sb@Rh12(CO24]4− and dimeric [{Sb@Rh12Sb(CO25}2Rh(CO2PPh3]7− derivatives

    Directory of Open Access Journals (Sweden)

    Cristina Femoni

    2016-10-01

    Full Text Available The hetero-metallic [Sb@Rh12(CO27]3− cluster has been known as for over three decades thanks to Vidal and co-workers, and represents the first example of an E-centered (E=heteroatom icosahedral rhodium carbonyl cluster. However, its synthesis required high temperature (140–160 °C and elevated CO pressure (400 atm. Applying the redox condensation method for cluster preparation, we herein report a new synthetic, high-yield route for preparing [Sb@Rh12(CO27]3− under much milder conditions of temperature and pressure. Notably, when the same synthesis was carried out under N2 instead of CO atmosphere, the new isostructural but unsaturated derivative [Sb@Rh12(CO24]4− was obtained, for which we report the full X-ray structural characterization. This species represents one of the few examples of an icosahedral cluster disobeying the electron-counting Wade-Mingos rules, possessing less than the expected 170 cluster valence electrons (CVEs. Judging from IR monitoring, the two species can be obtained one from the other by switching between N2 and CO atmosphere, making [Sb@Rh12(CO27]3− a spontaneous CO-releasing molecule. Finally, the study of the chemical reactivity of [Sb@Rh12(CO27]3− with PPh3 allowed us to obtain the new [{Sb@Rh12Sb(CO25}2Rh(CO2PPh3]7− dimeric compound, for which we herein report the full X-ray structural and 31P NMR analyses.

  4. Insufficient medications for atrial fibrillation and cardiac dysfunction in elderly hospitalized patients by comparison with related guidelines%252例老年心房纤颤合并心力衰竭的药物治疗与相关指南的差距

    Institute of Scientific and Technical Information of China (English)

    徐军; 缪东培; 包知达; 肖继明; 吕磊; 殷宇刚; 张凯

    2009-01-01

    目的:了解在住院的老年心房纤颤(简称房颤)合并心力衰竭的患者中β受体阻滞剂(Beta blocker)、血管紧张素转换酶抑制剂(ACEI)或血管紧张素Ⅱ受体拮抗剂(ARB)以及抗凝药物的应用现状,探讨与相关指南的差距.方法:通过回顾性分析,对在2004年2月至2007年12月期间住院的252例老年心房纤颤合并心力衰竭的患者进行调查.记录和统计有关的资料. 结果:入院时Beta-blocker、ACEI或ARB和抗凝治疗分别达到85.0%,78.2%,96.4%;但出院时减少至50.4%,54.8%,77.0%,仅8.7%的患者服华法林钠.各种药物的剂量均低于指南的要求,停药或减量的主要原因是药物相关的副作用和对治疗的不依从性. 结论:在住院的老年房颤合并心力衰竭患者中,Beta-blocker、ACEI或ARB以及抗凝药物的应用不足,主要与药物的副作用有关.

  5. Improved charge breeding efficiency of light ions with an electron cyclotron resonance ion source

    Energy Technology Data Exchange (ETDEWEB)

    Vondrasek, R.; Kutsaev, Sergey [Argonne National Laboratory, Argonne, Illinois 60439 (United States); Delahaye, P.; Maunoury, L. [Grand Accelerateur National d' Ions Lourds (GANIL), CEA/DSM-CNRS/IN2P3, Blvd Henri Becquerel, 14076 Caen (France)

    2012-11-15

    The Californium Rare Isotope Breeder Upgrade is a new radioactive beam facility for the Argonne Tandem Linac Accelerator System (ATLAS). The facility utilizes a {sup 252}Cf fission source coupled with an electron cyclotron resonance ion source to provide radioactive beam species for the ATLAS experimental program. The californium fission fragment distribution provides nuclei in the mid-mass range which are difficult to extract from production targets using the isotope separation on line technique and are not well populated by low-energy fission of uranium. To date the charge breeding program has focused on optimizing these mid-mass beams, achieving high charge breeding efficiencies of both gaseous and solid species including 14.7% for the radioactive species {sup 143}Ba{sup 27+}. In an effort to better understand the charge breeding mechanism, we have recently focused on the low-mass species sodium and potassium which up to present have been difficult to charge breed efficiently. Unprecedented charge breeding efficiencies of 10.1% for {sup 23}Na{sup 7+} and 17.9% for {sup 39}K{sup 10+} were obtained injecting stable Na{sup +} and K{sup +} beams from a surface ionization source.

  6. Dicty_cDB: VSI252 [Dicty_cDB

    Lifescience Database Archive (English)

    Full Text Available AGCTAATCTTTAATAGNATTAACAAACCC sequence update 2001. 3.22 Translated Amino Acid sequence ltk**milkkrlttlvll*l...VSSMEAKSMTW*rfryrtwfiifs kknktlklkyenkik*s*slixltn Frame B: ltk**milkkrlttlvll*lhflfqnln*rnsqsnkklylpntlqklv...yri*qrslsqkn *ilp*kklkii*kiltdlaeqii*kllvffkkrfhlwrlnl*lgkdlgielgslfflkki kh*n*nmkik*NKANHLIVINKPSLYVKLKKK--- ---ltk**milk

  7. 48 CFR 252.211-7003 - Item identification and valuation.

    Science.gov (United States)

    2010-10-01

    ... Defense Logistics Information System (DLIS) Commercial and Government Entity (CAGE) Code). Issuing agency... commercial use and has been recognized by DoD. All DoD recognized unique identification equivalents...

  8. 48 CFR 252.225-7013 - Duty-free entry.

    Science.gov (United States)

    2010-10-01

    ...) Scrap or salvage; or (ii) Competitive sale made, directed, or authorized by the Contracting Officer. (d... shipment under 19 CFR part 142 and notify Commander, Defense Contract Management Agency (DCMA) New York... Contractor's name, address, and Commercial and Government Entity (CAGE) code; (2) Prime contract number...

  9. 48 CFR 252.229-7005 - Tax exemptions (Spain).

    Science.gov (United States)

    2010-10-01

    ... following excise, luxury, and transaction taxes: (1) Derechos de Aduana (Customs Duties). (2) Impuesto de... Transfer Tax). (4) Impuesto Sobre el Lujo (Luxury Tax). (5) Actos Juridocos Documentados (Legal...

  10. 24 CFR 983.252 - PHA information for accepted family.

    Science.gov (United States)

    2010-04-01

    ... 24 Housing and Urban Development 4 2010-04-01 2010-04-01 false PHA information for accepted family... family. (a) Oral briefing. When a family accepts an offer of PBV assistance, the PHA must give the family... of how the program works; and (2) Family and owner responsibilities. (b) Information packet. The...

  11. 48 CFR 252.225-7020 - Trade Agreements Certificate.

    Science.gov (United States)

    2010-10-01

    ... country end product, nondesignated country end product, qualifying country end product, and U.S.-made end... are U.S.-made, qualifying country, or designated country end products unless— (i) There are no offers... identification of country of origin. (1) For all line items subject to the Trade Agreements clause of......

  12. 7 CFR 252.5 - Recipient agency responsibilities.

    Science.gov (United States)

    2010-01-01

    ... arise from the operation of the distribution program. (c) Refunds. A recipient agency purchasing end... if the total anticipated refund due for all purchases of end product from that processor during the... AGRICULTURE GENERAL REGULATIONS AND POLICIES-FOOD DISTRIBUTION NATIONAL COMMODITY PROCESSING PROGRAM §...

  13. Dicty_cDB: VSB252 [Dicty_cDB

    Lifescience Database Archive (English)

    Full Text Available 0. 4. 6 Translated Amino Acid sequence ---rliqqiiklkcllniipivklwirqkhylivvskws*VSMNLEVNKIEKVVITVRIN VVKIEINK...i*kkk ks*kkkikk Translated Amino Acid sequence (All Frames) Frame A: ---rliqqiiklkcllniipivklwir

  14. 46 CFR 252.31 - Wages of officers and crews.

    Science.gov (United States)

    2010-10-01

    ... OPERATORS OPERATING-DIFFERENTIAL SUBSIDY FOR BULK CARGO VESSELS ENGAGED IN WORLDWIDE SERVICES Calculation of... of the new base period by an index compiled by the Bureau of Labor Statistics. This index shall... publication, “International Financial Statistics”, published monthly by the International Monetary Fund....

  15. 48 CFR 252.229-7001 - Tax relief.

    Science.gov (United States)

    2010-10-01

    ... following paragraph (d) to the basic clause: (d) Tax relief will be claimed in Germany pursuant to the provisions of the Agreement Between the United States of America and Germany Concerning Tax Relief to be Accorded by Germany to United States Expenditures in the Interest of Common Defense. The Contractor...

  16. 48 CFR 252.215-7002 - Cost estimating system requirements.

    Science.gov (United States)

    2010-10-01

    ...(2), use the following clause: Cost Estimating System Requirements (DEC 2006) (a) Definitions..., totaling $50 million or more for which cost or pricing data were required; or (2) In its fiscal year... more (but less than $50 million) for which cost or pricing data were required; and (ii) Was notified...

  17. Dicty_cDB: AFH252 [Dicty_cDB

    Lifescience Database Archive (English)

    Full Text Available i*kilaiilkkllfnhqkkqlql*ynkilmilkq*hhh* sqnplvavlvkinhhhhhhvvvvviklkknknqvvvvvvkvnhhhhvvvviiinlkknkn qvvveem...ikrvlk le*kllkiryw*chqrvvlvnqqfhpcyhmvfqreiitppkyly*mlifavrqfqs*wvl inckl*iqsmvgfhqrcnkqimilk...CSSCPGQNACKSQADNPDKKSIEI RMKVIKNKILVMSSKGGVGKSTVSSLLSYGFSKRNNNTTKVSVLDVDICGPSIPKLMGVD KLQIINSEYGWIPPKVQQANHDIKVMSV--- ---rcnkqimilk...IPPKVQQANHDIKVMSV--- ---KVQQANHDIKVMSVGFLLGTPDAPVIWKGPRKTTMIRRFLKDTFWGKQDYLIIDTPP GTSDEHLSIINSLKSCNPDGAVLVTT...hhqsicirc*ylrsvnskangc* *ianykfrvwldstkgatsks*y*shvc--- ---KVQQANHDIKVMSVGFLLGTPDAPVIWKGPRKTTMIR

  18. 7 CFR 252.4 - Application to participate and agreement.

    Science.gov (United States)

    2010-01-01

    ... butter, cheese, corn grits, cornmeal, flour, macaroni, nonfat dry milk, peanut butter, peanut granules... produce the end product. In instances in which concentrated skim milk is substituted for nonfat dry milk, the processor shall draw down donated nonfat dry milk inventory only in an amount equal to the...

  19. 7 CFR 252.1 - Purpose and scope.

    Science.gov (United States)

    2010-01-01

    ... processing of commodities designated by the Secretary of Agriculture and the minimum requirements which NCP...) Eligible recipient agencies. Recipient agencies shall be eligible to participate in the NCP Program to the extent of their eligibility to receive the food involved in the NCP Program, pursuant to § 250.8 and...

  20. 48 CFR 252.225-7021 - Trade agreements.

    Science.gov (United States)

    2010-10-01

    ... (Australia, Bahrain, Canada, Chile, Costa Rica, Dominican Republic, El Salvador, Guatemala, Honduras, Mexico..., Belgium, Bulgaria, Canada, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany,...

  1. Dicty_cDB: SFC252 [Dicty_cDB

    Lifescience Database Archive (English)

    Full Text Available BD083792 |BD083792.1 Nucleic acid sequence characterized in that expression is potentiated in human neuroblastoma with good prognosi...s, in comparion between human neuroblastoma with good prognosis and human neuroblastoma with bad prognosis

  2. 42 CFR 84.252 - Gas masks; requirements and tests.

    Science.gov (United States)

    2010-10-01

    ... penetration after six hours of testing according to paragraph (b)(3) of this section shall not exceed 1 ppm... than four hours, the period of time for testing for vinyl chloride penetration will be performed at 150... penetration after nine hours of testing shall not exceed 1 ppm vinyl chloride.)...

  3. Mass Distribution Measurement of 252Cf Spontaneous Fission

    Institute of Scientific and Technical Information of China (English)

    LIU; Shi-long; YANG; Yi; ZHANG; Chun-li; HAN; Hong-yin

    2015-01-01

    The E-v method of measuring the kinetic energy(E)and velocity(v)of outgoing fission products has been utilized,with the goal of measuring the mass resolution better than 1atomic mass units(amu),and could identify every mass for light fission products of unsymmetrical fission.This work measured mass yield distribution

  4. Dicty_cDB: SHA252 [Dicty_cDB

    Lifescience Database Archive (English)

    Full Text Available estivum cDNA clone G750108G22, mRNA sequence. 44 3.8 1 CD453775 |CD453775.1 WHE2108_D02_H04ZT CS wheat salt-stressed crown...BQ487459.1 WHE2108_D02_H04ZY Wheat salt-stressed crown cDNA library Triticum aestivum cDNA clone WHE2108_D02

  5. Dicty_cDB: CHP252 [Dicty_cDB

    Lifescience Database Archive (English)

    Full Text Available deum elongation factor 2 mRNA, complete cds. 561 0.0 3 CK811111 |CK811111.1 Rasgsc6510 Salivary Gland 4th instar 3rd period (spinning....1 Rasgsc0236 Salivary Gland 4th instar 3rd period (spinning cocoon) Rhynchosciar...a americana cDNA, mRNA sequence. 84 2e-12 2 CK808524 |CK808524.1 Rasgsc1215 Salivary Gland 4th instar 3rd period (spinning...38 Salivary Gland 4th instar 3rd period (spinning cocoon) Rhynchosciara americana cDNA, mRNA sequence. 84 2e...-12 2 CK808525 |CK808525.1 Rasgsc1216 Salivary Gland 4th instar 3rd period (spinning

  6. 48 CFR 252.211-7006 - Radio Frequency Identification.

    Science.gov (United States)

    2010-10-01

    ... supply, as defined in DoD 4140.1-R, DoD Supply Chain Materiel Management Regulation, AP1.1.11: (A... immediate, automatic, and accurate identification of any item in the supply chain of any company, in any..., organizational tool kits, hand tools, and administrative and housekeeping supplies and equipment. (C) Class...

  7. Deepwater Horizon MC252 - Oil Spill: Oil Trajectories Maps

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Trajectory maps are produced using GNOME (General NOAA Operational Modeling Environment), which is an oil spill trajectory model developed by OR and academic...

  8. 40 CFR 60.252 - Standards for thermal dryers.

    Science.gov (United States)

    2010-07-01

    ...)(i) through (iii) of this section, as applicable to the affected facility. (i) For each thermal dryer...)(i) or (b)(3)(ii) of this section, as applicable to the affected facility. (i) For each thermal dryer... limits of this section. (c) Thermal dryers receiving all of their thermal input from an affected...

  9. Table of radionuclides (Vol. 4 - A = 133 to 252)

    Energy Technology Data Exchange (ETDEWEB)

    Be, M.M.; Chiste, V.; Dulieu, Ch. [CEA Saclay, Laboratoire National Henri Becquerel (LNHB), 91 - Gif-sur-Yvette (France); Browne, E. [Lawrence Berkeley National Lab., CA (United States); Chechev, V.; Kuzmenko, N. [Khlopin Radium Institute (KRI) (Russian Federation); Kondev, F.G. [Argonne National Lab., IL (United States); Luca, A. [Horia Hulubei National Institute of Physics and Nuclear Engineering (IFIN-HH) (Romania); Galan, M. [Ciemat, Lab. de Metrologia de Radiaciones Ionizantes (Spain); Pearce, A. [National Physical Laboratory (NPL) (United Kingdom); Huang, X. [China Institute of Atomic Energy (CIAE) (China)

    2008-07-01

    This monograph is one of several published in a series by the Bureau International des Poids et Mesures (BIPM) on behalf of the Comite Consultatif des Rayonnements Ionisants (CCRI), previously known as the Comite Consultatif pour les Etalons de Mesure des Rayonnements Ionisants (CCEMRI). The aim of this series of publications is to review topics that are of importance for the measurement of ionizing radiation and especially of radioactivity, in particular those techniques normally used by participants in international comparisons. It is hoped that these publications will prove to be useful reference volumes both for those who are already engaged in this field and for those who are approaching such measurements for the first time. The purpose of this monograph, number 4 in the series, is to present the recommended values of nuclear and decay data for a wide range of radionuclides. Activity measurements for more than fifty-five of these radionuclides have already been the subject of comparisons under the auspices of Section II (dedicated to the Measurement of radionuclides) of the CCRI. The material for this monograph is now covered in four volumes. The first two volumes contain the primary recommended data relating to half-lives, decay modes, x-rays, gamma-rays, electron emissions; alpha- and beta-particle transitions and emissions, and their uncertainties for a set of sixty-eight radionuclides, Volume I for those radionuclides with mass number up to and including 150 and Volume 2 for those radionuclides with mass number over 150. Volume 3 contains the equivalent data for twenty-six additional radionuclides as listed and reevaluations for {sup 125}Sb and {sup 153}Sm while Volume 4 contains the data for a further thirty-one radionuclides with re-evaluation for {sup 226}Ra. The data have been collated and evaluated by an international working group (Decay Data Evaluation Project) led by the LNE-LNHB. The evaluators have agreed on the methodologies to be used and the CD-ROM included with this monograph contains the evaluators' comments for each radionuclide in addition to the data tables included in the monograph. The work involved in evaluating nuclear data is on-going and the recommended values are updated on the LNHB web site at http://www.nucleide.org/DDEP{sub W}G/DDEPdata.htm. The publication of further volumes of Monograph 5 is envisaged as and when necessary to add new radionuclide data or re-evaluations in a more permanent format that can be referenced easily. Although other data sets may still be used when evaluating radionuclide activity, use of this common, recommended data set should help to reduce the uncertainties in activity evaluations and lead to more coherent results for comparisons. In order to update the data of the nuclides already present and to add new evaluations, the Laboratoire National Henri Becquerel (LNHB, France) and the Physikalisch-Technische Bundesanstalt (PTB, Germany) established a cooperative agreement; they were then joined by the Idaho National Engineering and Environmental Laboratory (INEEL, USA), the Lawrence Berkeley National Laboratory (LBNL, USA) and the Khlopin Radium Institute (KRI, Russia). This international collaboration is base d on an informal agreement, the initial work of this group was to discuss and to agree on a methodology t o be used in these evaluations. The data and associated uncertainties were evaluated from all available experiments and taking into account theoretical considerations. The main steps for the evaluation of the data and their uncertainties are: - a critical analysis of all available original publications in order to accept or not each value and it s uncertainty reduced to the combined standard uncertainty; - the determination of the best value which is either the weighted or the unweighted average of the retained values, this is decided after examination of the reduced {chi}{sup 2} value. For a weighted average of discrepant data, each weight is limited to 50 %, and the uncertainty, designated u,, is the larger of the internal or external uncertainty values, which may be expanded to cover the most precise input value. A value given without an uncertainty is considered questionable. It is provided for information and often its order of magnitude is estimated from the decay scheme.

  10. 7 CFR 25.2 - Objective and purpose.

    Science.gov (United States)

    2010-01-01

    ... departments, including Empowerment Zone and Enterprise Community Social Services Block Grant (EZ/EC SSBG... Office of the Secretary of Agriculture RURAL EMPOWERMENT ZONES AND ENTERPRISE COMMUNITIES General... Empowerment Zones and Enterprise Communities in rural areas in order to facilitate the empowerment of...

  11. 48 CFR 252.246-7001 - Warranty of data.

    Science.gov (United States)

    2010-10-01

    ...) Remedies. The following remedies shall apply to all breaches of the warranty, whether the Contractor... exceed ten percent of the total contract price. (ii) If the breach of the warranty is with respect to the..., DEPARTMENT OF DEFENSE CLAUSES AND FORMS SOLICITATION PROVISIONS AND CONTRACT CLAUSES Text of Provisions...

  12. Reliability of semiconductor and gas-filled diodes for over-voltage protection exposed to ionizing radiation

    Directory of Open Access Journals (Sweden)

    Stanković Koviljka

    2009-01-01

    Full Text Available The wide-spread use of semiconductor and gas-filled diodes for non-linear over-voltage protection results in a variety of possible working conditions. It is therefore essential to have a thorough insight into their reliability in exploitation environments which imply exposure to ionizing radiation. The aim of this paper is to investigate the influence of irradiation on over-voltage diode characteristics by exposing the diodes to californium-252 combined neutron/gamma radiation field. The irradiation of semiconductor over-voltage diodes causes severe degradation of their protection characteristics. On the other hand, gas-filled over-voltage diodes exhibit a temporal improvement of performance. The results are presented with the accompanying theoretical interpretations of the observed changes in over-voltage diode behaviour, based on the interaction of radiation with materials constituting the diodes.

  13. Environmental assessment of the thermal neutron activation explosive detection system for concourse use at US airports

    Energy Technology Data Exchange (ETDEWEB)

    Jones, C.G.

    1990-08-01

    This document is an environmental assessment of a system designed to detect the presence of explosives in checked airline baggage or cargo. The system is meant to be installed at the concourse or lobby ticketing areas of US commercial airports and uses a sealed radioactive source of californium-252 to irradiate baggage items. The major impact of the use of this system arises from direct exposure of the public to scattered or leakage radiation from the source and to induced radioactivity in baggage items. Under normal operation and the most likely accident scenarios, the environmental impacts that would be created by the proposed licensing action would not be significant. 44 refs., 19 figs., 18 tabs.

  14. Accurate determination of Curium and Californium isotopic ratios by inductively coupled plasma quadrupole mass spectrometry (ICP-QMS) in 248Cm samples for transmutation studies

    Energy Technology Data Exchange (ETDEWEB)

    Gourgiotis, A.; Isnard, H.; Aubert, M.; Dupont, E.; AlMahamid, I.; Cassette, P.; Panebianco, S.; Letourneau, A.; Chartier, F.; Tian, G.; Rao, L.; Lukens, W.

    2011-02-01

    The French Atomic Energy Commission has carried out several experiments including the mini-INCA (INcineration of Actinides) project for the study of minor-actinide transmutation processes in high intensity thermal neutron fluxes, in view of proposing solutions to reduce the radiotoxicity of long-lived nuclear wastes. In this context, a Cm sample enriched in {sup 248}Cm ({approx}97 %) was irradiated in thermal neutron flux at the High Flux Reactor (HFR) of the Laue-Langevin Institute (ILL). This work describes a quadrupole ICP-MS (ICP-QMS) analytical procedure for precise and accurate isotopic composition determination of Cm before sample irradiation and of Cm and Cf after sample irradiation. The factors that affect the accuracy and reproducibility of isotopic ratio measurements by ICP-QMS, such as peak centre correction, detector dead time, mass bias, abundance sensitivity and hydrides formation, instrumental background, and memory blank were carefully evaluated and corrected. Uncertainties of the isotopic ratios, taking into account internal precision of isotope ratio measurements, peak tailing, and hydrides formations ranged from 0.3% to 1.3%. This uncertainties range is quite acceptable for the nuclear data to be used in transmutation studies.

  15. Moderator design studies for a new neutron reference source based on the D–T fusion reaction

    Energy Technology Data Exchange (ETDEWEB)

    Mozhayev, Andrey V.; Piper, Roman K.; Rathbone, Bruce A.; McDonald, Joseph C.

    2016-06-01

    The radioactive isotope Californium-252 (252Cf) is relied upon internationally as a neutron calibration source for ionizing radiation dosimetry because of its high specific activity. The source may be placed within a heavy-water (D2O) moderating sphere to produce a softened spectrum representative of neutron fields common to commercial nuclear power plant environments, among others. Due to termination of the U.S. Department of Energy loan/lease program in 2012, the expense of obtaining 252Cf sources has undergone a significant increase, rendering high output sources largely unattainable. On the other hand, the use of neutron generators in research and industry applications has increased dramatically in recent years. Neutron generators based on deuterium-tritium (D-T) fusion reaction provide high neutron fluence rates and, therefore, could possibly be used as a replacement for 252Cf. To be viable, the 14.6 MeV D-T output spectrum must be significantly moderated to approximate common workplace environments. This paper presents the results of an effort to select appropriate moderating materials and design a configuration to reshape the primary neutron field toward a spectrum approaching that from a nuclear power plant workplace. A series of Monte-Carlo (MCNP) simulations of single layer high- and low-Z materials are used to identify initial candidate moderators. Candidates are refined through a similar series of simulations involving combinations of 2 to 5 different materials. The simulated energy distribution using these candidate moderators are rated in comparison to a target spectrum. Other properties, such as fluence preservation and/or enhancement, prompt gamma production and other characteristics are also considered.

  16. A review of neutron scattering correction for the calibration of neutron survey meters using the shadow cone method

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Sang In; Kim, Bong Hwan; Kim, Jang Lyul; Lee, Jung Il [Health Physics Team, Korea Atomic Energy Research Institute, Daejeon (Korea, Republic of)

    2015-12-15

    The calibration methods of neutron-measuring devices such as the neutron survey meter have advantages and disadvantages. To compare the calibration factors obtained by the shadow cone method and semi-empirical method, 10 neutron survey meters of five different types were used in this study. This experiment was performed at the Korea Atomic Energy Research Institute (KAERI; Daejeon, South Korea), and the calibration neutron fields were constructed using a {sup 252}Californium ({sup 252}Cf) neutron source, which was positioned in the center of the neutron irradiation room. The neutron spectra of the calibration neutron fields were measured by a europium-activated lithium iodide scintillator in combination with KAERI's Bonner sphere system. When the shadow cone method was used, 10 single moderator-based survey meters exhibited a smaller calibration factor by as much as 3.1 - 9.3% than that of the semi-empirical method. This finding indicates that neutron survey meters underestimated the scattered neutrons and attenuated neutrons (i.e., the total scatter corrections). This underestimation of the calibration factor was attributed to the fact that single moderator-based survey meters have an under-ambient dose equivalent response in the thermal or thermal-dominant neutron field. As a result, when the shadow cone method is used for a single moderator-based survey meter, an additional correction and the International Organization for Standardization standard 8529-2 for room-scattered neutrons should be considered.

  17. Deepwater Horizon MC252 - Oil Spill: Ocean Imaging Corp.'s Aerial Multispectral Oil Mapping System

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Ocean Imaging Corp.'s Aerial Multispectral Oil Mapping System employs a customizable 4-spectral channel system and IR imager integrated to allow simultaneous data...

  18. 48 CFR 252.246-7003 - Notification of Potential Safety Issues.

    Science.gov (United States)

    2010-10-01

    ... Administrative Contracting Officer (ACO) and the Procuring Contracting Officer (PCO) as soon as practicable, but... notification to the ACO and the PCO within 5 working days that includes— (i) A summary of the defect or... ACO and the PCO, if the subcontractor is aware of the ACO and the PCO for the contract. (End of clause)...

  19. Calculated neutron air kerma strength conversion factors for a generically encapsulated Cf-252 brachytherapy source

    CERN Document Server

    Rivard, M J; D'Errico, F; Tsai, J S; Ulin, K; Engler, M J

    2002-01-01

    The sup 2 sup 5 sup 2 Cf neutron air kerma strength conversion factor (S sub K sub N /m sub C sub f) is a parameter needed to convert the radionuclide mass (mu g) provided by Oak Ridge National Laboratory into neutron air kerma strength required by modern clinical brachytherapy dosimetry formalisms indicated by Task Group No. 43 of the American Association of Physicists in Medicine (AAPM). The impact of currently used or proposed encapsulating materials for sup 2 sup 5 sup 2 Cf brachytherapy sources (Pt/Ir-10%, 316L stainless steel, nitinol, and Zircaloy-2) on S sub K sub N /m sub C sub f was calculated and results were fit to linear equations. Only for substantial encapsulation thicknesses, did S sub K sub N /m sub C sub f decrease, while the impact of source encapsulation composition is increasingly negligible as Z increases. These findings are explained on the basis of the non-relativistic kinematics governing the majority of sup 2 sup 5 sup 2 Cf neutron interactions. Neutron kerma and energy spectra resul...

  20. 48 CFR 252.204-7004 - Alternate A, Central Contractor Registration.

    Science.gov (United States)

    2010-10-01

    ... information required for the conduct of business with the Government. “Commercial and Government Entity (CAGE) code” means— (1) A code assigned by the Defense Logistics Information Service (DLIS) to identify a commercial or Government entity; or (2) A code assigned by a member of the North Atlantic Treaty...

  1. 48 CFR 252.225-7022 - Trade agreements certificate-inclusion of Iraqi end products.

    Science.gov (United States)

    2010-10-01

    ... products: (Country of Origin) (Line Item Number) (End of provision) ... Certificate—Inclusion of Iraqi End Products (SEP 2008) (a) Definitions. Designated country end product, Iraqi end product, nondesignated country end product, qualifying country end product, and U.S.-made...

  2. 48 CFR 252.225-7000 - Buy American Act-Balance of Payments Program Certificate.

    Science.gov (United States)

    2010-10-01

    ... Item Number) (Country of Origin) (3) The following end products are other foreign end products... definition of “domestic end product”: (Line Item Number) (Country of Origin (If known)) (End of provision) ... end product,” “qualifying country,” “qualifying country end product,” and “United States” have...

  3. 48 CFR 252.219-7003 - Small business subcontracting plan (DoD contracts).

    Science.gov (United States)

    2010-10-01

    ... subcontracting goal. (e) A mentor firm, under the Pilot Mentor-Protege Program established under Section 831 of... awarded— (1) Protege firms which are qualified organizations employing the severely handicapped; and (2) Former protege firms that meet the criteria in Section 831(g)(4) of Pub. L. 101-510. (f) The master...

  4. 48 CFR 252.203-7000 - Requirements Relating to Compensation of Former DoD Officials.

    Science.gov (United States)

    2010-10-01

    ... TO COMPENSATION OF FORMER DOD OFFICIALS (JAN 2009) (a) Definition. Covered DoD official, as used in... evaluation team for a contract in an amount in excess of $10 million. (b) The Contractor shall not...

  5. 48 CFR 252.247-7021 - Returnable containers other than cylinders.

    Science.gov (United States)

    2010-10-01

    ...) Returnable container, as used in this clause, includes reels, spools, drums, carboys, liquid petroleum gas... day the containers are delivered to the Contractor (if the original delivery was f.o.b. origin) or...

  6. 48 CFR 252.247-7023 - Transportation of supplies by sea.

    Science.gov (United States)

    2010-10-01

    ...; construction materials; and components of the foregoing. (7) U.S.-flag vessel means a vessel of the United... shall use U.S.-flag vessels if— (i) This contract is a construction contract; or (ii) The supplies being... this contract a representation that to the best of its knowledge and belief— (1) No...

  7. 48 CFR 252.227-7015 - Technical data-Commercial items.

    Science.gov (United States)

    2010-10-01

    ... REGULATIONS SYSTEM, DEPARTMENT OF DEFENSE CLAUSES AND FORMS SOLICITATION PROVISIONS AND CONTRACT CLAUSES Text... information, regardless of the form or method of recording, of a scientific or technical nature (including... without restrictions on use, modification, reproduction, release, or further disclosure other than...

  8. 48 CFR 252.227-7024 - Notice and approval of restricted designs.

    Science.gov (United States)

    2010-10-01

    ... structures, machines, products, materials, construction methods, and equipment that are readily available through Government or competitive commercial channels, or through standard or proven production techniques, methods, and processes. Unless approved by the Contracting Officer, the Contractor shall not produce...

  9. Investigations of short half-life states from SF of {sup 252}Cf

    Energy Technology Data Exchange (ETDEWEB)

    Fong, D.; Hwang, J.K.; Ramayya, A.V.; Hamilton, J.H.; Beyer, C.J.; Li, K.; Gore, P.M.; Jones, E.F.; Luo, Y.X. [Vanderbilt University, Physics Department, Nashville, TN (United States); Rasmussen, J.O.; Wu, S.C.; Lee, I.Y.; Fallon, P.; Ginter, T.N. [Lawrence Berkeley National Laboratory, Berkeley, CA (United States); Zhu, S.J. [Tsinghua University, Department of Physics, Beijing (China); Stoyer, M.A.; Asztalos, S.J. [Lawrence Livermore National Laboratory, Livermore, CA (United States); Cole, J.D. [Idaho National Engineering and Environmental Laboratory, Idaho Falls, ID (United States); Ter-Akopian, G.M.; Daniel, A. [Joint Institute for Nuclear Research, Flerov Laboratory for Nuclear Reactions, Dubna (Russian Federation)

    2005-09-01

    By using different time-gated triple {gamma} coincidence data, the half-lives (T{sub 1/2}) of several short lived states in neutron-rich nuclei have been studied. The first excited states in the ground state bands often decay by delayed {gamma} emission. By creating triple {gamma} coincidence spectra with time windows of 8, 16, 20, 28, and 48 ns, we have studied states with half-lives below 10 ns. The estimated half-lives of {sup 102}Zr, {sup 137}Xe, and {sup 143}Ba are in reasonable agreement with previously reported values. We extract the first estimates of the half lives of the 2{sup +} states in {sup 104}Zr and {sup 152}Ce. (orig.)

  10. Alicia Poderti, Diccionario del peronismo, Buenos Aires, Editorial Biblos, 2010, 252 p.

    OpenAIRE

    Cristiá, Moira

    2011-01-01

    La editorial Biblios acaba de lanzar dentro de su línea “Lexicon” este diccionario que reúne expresiones, fechas, personajes y conceptos ligados al fenómeno peronista. Mientras que este género de obras suelen presentarse como aportes colectivos, aquí Alicia Poderti asume enteramente el trabajo. Extendiendo y profundizando aquellas reflexiones publicadas en 2005 en el artículo “Peronismo/antiperonismo y el diccionario de los argentinos (1945-1976)”, la doctora en Ciencias Sociales y Humanidade...

  11. 50 CFR 14.252 - What definitions do I need to know?

    Science.gov (United States)

    2010-10-01

    ... wildlife species means a specimen of any of the following eight species: Lion (Panthera leo), tiger (Panthera tigris), leopard (Panthera pardus), snow leopard (Uncia uncia), clouded leopard (Neofelis nebulosa), jaguar (Panthera onca), cheetah (Acinonyx jubatus), and cougar (Puma concolor) or any hybrids...

  12. 24 CFR 92.252 - Qualification as affordable housing: Rental housing.

    Science.gov (United States)

    2010-04-01

    ... established by HUD under 24 CFR 888.111; or (2) A rent that does not exceed 30 percent of the adjusted income... certificate or voucher holder under 24 CFR part 982—Section 8 Tenant-Based Assistance: Unified Rule for Tenant... amount that exceeds the market rent for comparable, unassisted units in the neighborhood. (j) Fixed...

  13. 48 CFR 252.247-7016 - Contractor liability for loss or damage.

    Science.gov (United States)

    2010-10-01

    ... Services, or delivered under Schedule II, Inbound Services— (1) If notified within one year after delivery..., the liability is for the full cost of satisfactory repair or for the current replacement value of the...) The Contractor's liability shall be for the full cost of satisfactory repair, or for the...

  14. 48 CFR 252.217-7005 - Inspection and manner of doing work.

    Science.gov (United States)

    2010-10-01

    ... Shipping, the U.S. Coast Guard, and the Institute of Electrical and Electronic Engineers, in effect at the... accordance with Occupational Safety and Health Administration regulations (29 CFR 1915.14) before any hot... shall at all times keep the site of the work on the vessel free from accumulation of waste material...

  15. 48 CFR 252.235-7000 - Indemnification under 10 U.S.C. 2354-fixed price.

    Science.gov (United States)

    2010-10-01

    ... or direction of— (i) All or substantially all of the Contractor's business; (ii) All or substantially... Contractor shall buy and maintain, to the extent available, insurance against unusually hazardous risks in... papers and the like, between the Contractor and the subcontractor, as exist between the Government...

  16. 48 CFR 252.225-7045 - Balance of Payments Program-Construction Material Under Trade Agreements.

    Science.gov (United States)

    2010-10-01

    ... (Aruba, Austria, Belgium, Bulgaria, Canada, Cyprus, Czech Republic, Denmark, Estonia, Finland, France...); (2) A Free Trade Agreement country (Australia, Bahrain, Canada, Chile, Costa Rica, Dominican Republic, El Salvador, Guatemala, Honduras, Mexico, Morocco, Nicaragua, Peru, or Singapore); (3) A...

  17. 48 CFR 252.225-7006 - Quarterly reporting of actual contract performance outside the United States.

    Science.gov (United States)

    2010-10-01

    ... of DD Form 2139 from the Contracting Officer or via the Internet at http://www.dtic.mil/whs...) Definition. United States, as used in this clause, means the 50 States, the District of Columbia,...

  18. 48 CFR 252.211-7005 - Substitutions for military or Federal specifications and standards.

    Science.gov (United States)

    2010-10-01

    ... via the Internet at http://guidebook.dcma.mil/20/guidebook_process.htm (paragraph 4.2). (c) An offeror..., but is not yet listed at the Internet site specified in paragraph (b) of this clause, submit...: Substitutions For Military or Federal Specifications and Standards (NOV 2005) (a) Definition. “SPI process,”...

  19. Pressure and Arc Voltage Measurement in a 252 kV SF6 Puffer Circuit Breaker

    Science.gov (United States)

    Zhong, Jianying; Guo, Yujing; Zhang, Hao

    2016-05-01

    The pressure distribution in an arcing chamber is critically important for the SF6 puffer circuit breaker design. In this paper, the pressure variation of four locations in the nozzle was measured by piezoresistive and fiber optical pressure sensors at two current levels of 10 kA and 50 kA. An arc voltage measurement was also taken. The results demonstrate that using either type of sensor with a connecting tube is able to detect the fast pressure variation in circuit breakers, however the possible distortion and delay to the pressure transient caused by the tube need further study.

  20. 48 CFR 252.223-7002 - Safety precautions for ammunition and explosives.

    Science.gov (United States)

    2010-10-01

    ... component part of an explosive, an ammunition or explosive end item, or of a weapon system— (i) Inert...) Oxidizers; (v) Powdered metals; or (vi) Other materials having fire or explosive characteristics. (b)...

  1. 40 CFR 81.252 - Northwest Kansas Intrastate Air Quality Control Region.

    Science.gov (United States)

    2010-07-01

    ..., Cheyenne County, Decatur County, Ellis County, Gove County, Graham County, Logan County, Ness County..., Sheridan County, Sherman County, Smith County, Thomas County, Trego County, Wallace County....

  2. 48 CFR 252.225-7009 - Restriction on Acquisition of Certain Articles Containing Specialty Metals.

    Science.gov (United States)

    2010-10-01

    ... particles in circuits, using interconnections of electrical devices such as resistors, inductors, capacitors... of the following elements: Aluminum, chromium, cobalt, molybdenum, nickel, niobium (columbium...., a special reinforced handle made of specialty metal is added to a COTS item). (C) If two or...

  3. 48 CFR 252.209-7007 - Prohibited Financial Interests for Lead System Integrators.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Prohibited Financial... Financial Interests for Lead System Integrators (JUL 2009) (a) Definitions. As used in this clause— (1) Lead... system responsibility. Unless an exception is granted, the Contractor shall not have any direct...

  4. Wide Structure of High Energy Gamma Ray Spectrum in Spontaneous Fission of252Cf

    Institute of Scientific and Technical Information of China (English)

    1996-01-01

    WideStructureofHighEnergyGammaRaySpectruminSpontaneousFissionof252CfHanHongyin;HuangZhengde;LiAnli;HouLong;WangYihuaBacSha?..

  5. Pressure and Arc Voltage Measurement in a 252 kV SF6 Puffer Circuit Breaker

    Institute of Scientific and Technical Information of China (English)

    ZHONG Jianying; GUO Yujing; ZHANG Hao

    2016-01-01

    The pressure distribution in an arcing chamber is critically important for the SF6 puffer circuit breaker design.In this paper,the pressure variation of four locations in the nozzle was measured by piezoresistive and fiber optical pressure sensors at two current levels of 10 kA and 50 kA.An arc voltage measurement was also taken.The results demonstrate that using either type of sensor with a connecting tube is able to detect the fast pressure variation in circuit breakers,however the possible distortion and delay to the pressure transient caused by the tube need further study.

  6. 48 CFR 252.225-7012 - Preference for certain domestic commodities.

    Science.gov (United States)

    2010-10-01

    ... Germany Greece Israel Italy Luxembourg Netherlands Norway Portugal Spain Sweden Switzerland Turkey United... Columbia, and outlying areas. (5) U.S.-flag vessel means a vessel of the United States or belonging to the... fabric in Federal Supply Group 83, Textile/leather/furs/apparel/findings/ tents/flags, or Federal...

  7. 48 CFR 252.225-7024 - Requirement for products or services from Iraq or Afghanistan.

    Science.gov (United States)

    2010-10-01

    ... products or services from Iraq or Afghanistan. As prescribed in 225.7703-5(b), use the following clause: Requirement for Products or Services From Iraq or Afghanistan (SEP 2008) (a) Definitions. As used in this... shall provide only products from Iraq or Afghanistan or services from Iraq or Afghanistan under...

  8. Modifications of benzene myelotoxicity and metabolism by phenobarbital, SKF-252A and 3-methylcholanthrene

    Energy Technology Data Exchange (ETDEWEB)

    Gill, D.P.; Kempen, R.R.; Nash, J.B.; Ellis, S.

    1979-11-05

    It has recently been suggested that the primary myelotoxic species generated from benzene is not produced directly from the parent compound, but from phenol or an even later metabolite. Several compounds that alter the activities of microsomal oxidative and conjugating enzymes were studied for their effects on benzene's myelotoxicity and metabolism. Phenobarbital (PB) protected animals from leucopnia and increased both to total amount of phenol as well as the amount of unconjugated phenol excreted in the urine. SKF-525A had no effect on the leucopenia, whereas it reduced the conversion of benzene to phenol without changing the excretion of unconjugated phenol. 3-Methylcholanthrene also did not prevent the leucopenia, but it did increase the conversion of benzene to phenol and the amount of unconjugated phenol excreted during the first days of the experiment. These data indicate that the early phases of benzene's metabolism may be modulated by the drug pretreatments employed, but myelotoxicity was abated only by PB. We conclude that the marrow effect of benzene is due to a metabolic product other than phenol and, furthermore that the formation of this toxic principle is not strictly dependent on the rate of phenol production.

  9. γ -soft Ba146 and the role of nonaxial shapes at N90

    Energy Technology Data Exchange (ETDEWEB)

    Mitchell, A. J.; Lister, C. J.; McCutchan, E. A.; Albers, M.; Ayangeakaa, A. D.; Bertone, P. F.; Carpenter, M. P.; Chiara, C. J.; Chowdhury, P.; Clark, J. A.; Copp, P.; David, H. M.; Deo, A. Y.; DiGiovine, B.; D' Olympia, N.; Dungan, R.; Harding, R. D.; Harker, J.; Hota, S. S.; Janssens, R. V. F.; Kondev, F. G.; Liu, S. H.; Ramayya, A. V.; Rissanen, J.; Savard, G.; Seweryniak, D.; Shearman, R.; Sonzogni, A. A.; Tabor, S. L.; Walters, W. B.; Wang, E.; Zhu, S.

    2016-01-01

    Low-spin states in the neutron-rich, N=90 nuclide Ba146 were populated following β decay of Cs146, with the goal of clarifying the development of deformation in barium isotopes through delineation of their nonyrast structures. Fission fragments of Cs146 were extracted from a 1.7-Ci Cf252 source and mass selected using the CAlifornium Rare Ion Breeder Upgrade (CARIBU) facility. Low-energy ions were deposited at the center of a box of thin β detectors, surrounded by a highly efficient high-purity Ge array. The new Ba146 decay scheme now contains 31 excited levels extending up to ~2.5 MeV excitation energy, double what was previously known. These data are compared to predictions from the interacting boson approximation (IBA) model. It appears that the abrupt shape change found at N=90 in Sm and Gd is much more gradual in Ba and Ce, due to an enhanced role of the γ degree of freedom.

  10. Production of Medical Radioisotopes in the ORNL High Flux Isotope Reactor (HFIR) for Cancer Treatment and Arterial Restenosis Therapy after PTCA

    Science.gov (United States)

    Knapp, F. F. Jr.; Beets, A. L.; Mirzadeh, S.; Alexander, C. W.; Hobbs, R. L.

    1998-06-01

    The High Flux Isotope Reactor (HFIR) at the Oak Ridge National Laboratory (ORNL) represents an important resource for the production of a wide variety of medical radioisotopes. In addition to serving as a key production site for californium-252 and other transuranic elements, important examples of therapeutic radioisotopes which are currently routinely produced in the HFIR for distribution include dysprosium-166 (parent of holmium-166), rhenium-186, tin-117m and tungsten-188 (parent of rhenium-188). The nine hydraulic tube (HT) positions in the central high flux region permit the insertion and removal of targets at any time during the operating cycle and have traditionally represented a major site for production of medical radioisotopes. To increase the irradiation capabilities of the HFIR, special target holders have recently been designed and fabricated which will be installed in the six Peripheral Target Positions (PTP), which are also located in the high flux region. These positions are only accessible during reactor refueling and will be used for long-term irradiations, such as required for the production of tin-117m and tungsten-188. Each of the PTP tubes will be capable of housing a maximum of eight HT targets, thus increasing the total maximum number of HT targets from the current nine, to a total of 57. In this paper the therapeutic use of reactor-produced radioisotopes for bone pain palliation and vascular brachytherapy and the therapeutic medical radioisotope production capabilities of the ORNL HFIR are briefly discussed.

  11. Production of medical radioisotopes in the ORNL High Flux Isotope Reactor (HFIR) for cancer treatment and arterial restenosis therapy after PTCA

    Energy Technology Data Exchange (ETDEWEB)

    Knapp, F.F. Jr.; Beets, A.L.; Mirzadeh, S.; Alexander, C.W.; Hobbs, R.L.

    1998-06-01

    The High Flux Isotope Reactor (HFIR) at the Oak Ridge National Laboratory (ORNL) represents an important resource for the production of a wide variety of medical radioisotopes. In addition to serving as a key production site for californium-252 and other transuranic elements, important examples of therapeutic radioisotopes which are currently routinely produced in the HFIR for distribution include dysprosium-166 (parent of holmium-166), rhenium-186, tin-117m and tungsten-188 (parent of rhenium-188). The nine hydraulic tube (HT) positions in the central high flux region permit the insertion and removal of targets at any time during the operating cycle and have traditionally represented a major site for production of medical radioisotopes. To increase the irradiation capabilities of the HFIR, special target holders have recently been designed and fabricated which will be installed in the six Peripheral Target Positions (PTP), which are also located in the high flux region. These positions are only accessible during reactor refueling and will be used for long-term irradiations, such as required for the production of tin-117m and tungsten-188. Each of the PTP tubes will be capable of housing a maximum of eight HT targets, thus increasing the total maximum number of HT targets from the current nine, to a total of 57. In this paper the therapeutic use of reactor-produced radioisotopes for bone pain palliation and vascular brachytherapy and the therapeutic medical radioisotope production capabilities of the ORNL HFIR are briefly discussed.

  12. Compensated bismuth-loaded plastic scintillators for neutron detection using low-energy pseudo-spectroscopy

    Energy Technology Data Exchange (ETDEWEB)

    Dumazert, Jonathan, E-mail: jonathan.dumazert@cea.fr [CEA, LIST, Laboratoire Capteurs Architectures Electroniques, 91191 Gif-sur-Yvette (France); Coulon, Romain; Bertrand, Guillaume H.V.; Normand, Stéphane [CEA, LIST, Laboratoire Capteurs Architectures Electroniques, 91191 Gif-sur-Yvette (France); Méchin, Laurence [CNRS, UCBN, Groupe de Recherche en Informatique, Image, Automatique et Instrumentation de Caen, 14050 Caen (France); Hamel, Matthieu [CEA, LIST, Laboratoire Capteurs Architectures Electroniques, 91191 Gif-sur-Yvette (France)

    2016-05-21

    Gadolinium-covered modified plastic scintillators show a high potential for the deployment of cost-effective neutron detectors. Taking advantage of the low-energy photon and electron signature of thermal neutron captures in gadolinium-155 and gadolinium-157 however requires a background correction. In order to display a trustable rate, dual compensation schemes appear as an alternative to Pulse Shape Discrimination. This paper presents the application of such a compensation scheme to a two-bismuth loaded plastic scintillator system. A detection scintillator interacts with incident photon and fast neutron radiations and is covered with a gadolinium converter to become thermal neutron-sensitive as well. In the meantime, an identical compensation scintillator, covered with terbium, solely interacts with the photon and fast neutron part of incident radiations. After the acquisition and the treatment of the counting signals from both sensors, a hypothesis test determines whether the resulting count rate after subtraction falls into statistical fluctuations or provides a robust image of neutron activity. A laboratory prototype is tested under both photon and neutron radiations, allowing us to investigate the performance of the overall compensation system. The study reveals satisfactory results in terms of robustness to a cesium-137 background and in terms of sensitivity in presence of a californium-252 source.

  13. Fast neutron tomography with real-time pulse-shape discrimination in organic scintillation detectors

    Science.gov (United States)

    Joyce, Malcolm J.; Agar, Stewart; Aspinall, Michael D.; Beaumont, Jonathan S.; Colley, Edmund; Colling, Miriam; Dykes, Joseph; Kardasopoulos, Phoevos; Mitton, Katie

    2016-10-01

    A fast neutron tomography system based on the use of real-time pulse-shape discrimination in 7 organic liquid scintillation detectors is described. The system has been tested with a californium-252 source of dose rate 163 μSv/h at 1 m and neutron emission rate of 1.5×107 per second into 4π and a maximum acquisition time of 2 h, to characterize two 100×100×100 mm3 concrete samples. The first of these was a solid sample and the second has a vertical, cylindrical void. The experimental data, supported by simulations with both Monte Carlo methods and MATLAB®, indicate that the presence of the internal cylindrical void, corners and inhomogeneities in the samples can be discerned. The potential for fast neutron assay of this type with the capability to probe hydrogenous features in large low-Z samples is discussed. Neutron tomography of bulk porous samples is achieved that combines effective penetration not possible with thermal neutrons in the absence of beam hardening.

  14. X-ray Measurements of a Thermo Scientific P385 DD Neutron Generator

    Energy Technology Data Exchange (ETDEWEB)

    E.H. Seabury; D.L. Chichester; A.J. Caffrey; J. Simpson; M. Lemchak; C.J. Wharton

    2001-08-01

    Idaho National Laboratory is experimenting with electrical neutron generators, as potential replacements for californium-252 radioisotopic neutron sources in its PINS prompt gamma-ray neutron activation analysis (PGNAA) system for the identification of military chemical warfare agents and explosives. In addition to neutron output, we have recently measured the x-ray output of the Thermo Scientific P385 deuterium-deuterium neutron generator. X-rays are a normal byproduct from a neutron generator and depending on their intensity and energy they can interfere with gamma rays from the object under test, increase gamma-spectrometer dead time, and reduce PGNAA system throughput. The P385 x-ray energy spectrum was measured with a high-purity germanium (HPGe) detector, and a broad peak is evident at about 70 keV. To identify the source of the x-rays within the neutron generator assembly, it was scanned by collimated scintillation detectors along its long axis. At the strongest x-ray emission points, the generator also was rotated 60° between measurements. The scans show the primary source of x-ray emission from the P385 neutron generator is an area 60 mm from the neutron production target, in the vicinity of the ion source. Rotation of the neutron generator did not significantly alter the x-ray count rate, and the x-ray emission appears to be axially symmetric within the neutron generator.

  15. Compensated bismuth-loaded plastic scintillators for neutron detection using low-energy pseudo-spectroscopy

    Science.gov (United States)

    Dumazert, Jonathan; Coulon, Romain; Bertrand, Guillaume H. V.; Normand, Stéphane; Méchin, Laurence; Hamel, Matthieu

    2016-05-01

    Gadolinium-covered modified plastic scintillators show a high potential for the deployment of cost-effective neutron detectors. Taking advantage of the low-energy photon and electron signature of thermal neutron captures in gadolinium-155 and gadolinium-157 however requires a background correction. In order to display a trustable rate, dual compensation schemes appear as an alternative to Pulse Shape Discrimination. This paper presents the application of such a compensation scheme to a two-bismuth loaded plastic scintillator system. A detection scintillator interacts with incident photon and fast neutron radiations and is covered with a gadolinium converter to become thermal neutron-sensitive as well. In the meantime, an identical compensation scintillator, covered with terbium, solely interacts with the photon and fast neutron part of incident radiations. After the acquisition and the treatment of the counting signals from both sensors, a hypothesis test determines whether the resulting count rate after subtraction falls into statistical fluctuations or provides a robust image of neutron activity. A laboratory prototype is tested under both photon and neutron radiations, allowing us to investigate the performance of the overall compensation system. The study reveals satisfactory results in terms of robustness to a cesium-137 background and in terms of sensitivity in presence of a californium-252 source.

  16. Measurement of neutron dose and spectra at light-water reactors

    Energy Technology Data Exchange (ETDEWEB)

    Soldat, K.L.; Endres, G.W.R.; Cummings, F.M.

    1982-08-01

    In choosing one dosimeter over another, both sensitivity and precision must be addressed. It has been determined that dosimeters employing NTA film lack adequate sensitivity for use inside containment of nuclear plants. From this study, it is apparent that CR-39 and polycarbonate track etch films used without radiators are also inadequate. The rest of the dosimeters tested displayed adequate sensitivity. The two general types of dosimeters which comprise that group are: (1) TLDs and (2) the polycarbonate track etch which was used in conjunction with (n, ..cap alpha..) radiators. The precision of the TLD dosimeter depends on the calibration technique and response correction technique. TLD dosimeters calibrated to D/sub 2/O-moderated californium-252 or corrected based on 9- to 3-in. sphere response rates seemed to function best inside reactor containment. Polycarbonate track etch film with (n, ..cap alpha..) radiators was found to be sensitive enough for use inside reactor containment; however, the standard deviation for the results was roughly twice the value of the most precise TLD albedo dosimeters. Also, several of the polycarbonate dosimeters saturated, rendering any evaluation impossible.

  17. Neutron activation determination of gold in technogenic raw materials with different mineral composition

    Directory of Open Access Journals (Sweden)

    Yudakov Aleksandr A.

    2015-01-01

    Full Text Available The methods used to determine the gold content in the technogenic objects of gold mining were analyzed regarding their non-homogeneity and complexity of chemical and mineral compositions. A possible application of the neutron activation analysis with the use of the californium source of neutrons for determining the content of fine-grained and extra-fine-grained gold in the technogenic objects, including the bottom-ash waste of energy providers, is considered. It was demonstrated that the chemical composition of the sample affects the neuron flux distribution in the sample, which can essentially distort the results of the neutron activation analysis. In order to eliminate possible systematic errors investigations of the effect of the sample mineral composition on the results of the gold determination using the neutron activation analysis were carried out. Namely, a large mass of rock (3-5 kg was loaded into an activation zone using four matrix types such as silicate, carbon-containing, iron-containing, and titanium magnetite. It was shown that there wereno significant difference between the dispersal of the fluxes of thermal and resonance neutrons emitted from 252Cf during activation of the gold-containing technogenic samples with different mineral compositions.

  18. Blend Down Monitoring System Fissile Mass Flow Monitor Implementation at the ElectroChemical Plant, Zelenogorsk, Russia

    Energy Technology Data Exchange (ETDEWEB)

    Uckan, T.

    2005-11-11

    The implementation plans and preparations for installation of the Fissile Mass Flow Monitor (FMFM) equipment at the ElectroChemical Plant (ECP), Zelenogorsk, Russia, are presented in this report. The FMFM, developed at Oak Ridge National Laboratory, is part of the Blend Down Monitoring System (BDMS), developed for the U.S. Department of Energy Highly Enriched Uranium (HEU) Transparency Implementation Program. The BDMS provides confidence to the United States that the Russian nuclear facilities supplying the lower-assay ({approx}4%) product low enriched uranium (P-LEU) to the United States from down-blended weapons-grade HEU are meeting the nonproliferation goals of the government-to-government HEU Purchase Agreement, signed between the Russian Federation and the United States in 1993. The first BDMS has been operational at Ural Electrochemical Integrated Plant, Novouralsk, since February 1999 and is successfully providing HEU transparency data to the United States. The second BDMS was installed at ECP in February 2003. The FMFM makes use of a set of thermalized californium-252 ({sup 252}Cf) spontaneous neutron sources for a modulated fission activation of the UF{sub 6} gas stream for measuring the {sup 235}U fissile mass flow rate. To do this, the FMFM measures the transport time of the fission fragments created from the fission activation process under the modulated source to the downstream detectors by detecting the delayed gamma rays from the fission fragments. The FMFM provides unattended, nonintrusive measurements of the {sup 235}U mass flow in the HEU, LEU blend stock, and P-LEU process legs. The FMFM also provides the traceability of the HEU flow to the product process leg. This report documents the technical installation requirements and the expected operational characteristics of the ECP FMFM.

  19. Charge breeding results and future prospects with electron cyclotron resonance ion source and electron beam ion source (invited).

    Science.gov (United States)

    Vondrasek, R; Levand, A; Pardo, R; Savard, G; Scott, R

    2012-02-01

    The Californium Rare Ion Breeder Upgrade (CARIBU) of the Argonne National Laboratory ATLAS facility will provide low-energy and reaccelerated neutron-rich radioactive beams for the nuclear physics program. A 70 mCi (252)Cf source produces fission fragments which are thermalized and collected by a helium gas catcher into a low-energy particle beam with a charge of 1+ or 2+. An electron cyclotron resonance (ECR) ion source functions as a charge breeder in order to raise the ion charge sufficiently for acceleration in the ATLAS linac. The final CARIBU configuration will utilize a 1 Ci (252)Cf source to produce radioactive beams with intensities up to 10(6) ions∕s for use in the ATLAS facility. The ECR charge breeder has been tested with stable beam injection and has achieved charge breeding efficiencies of 3.6% for (23)Na(8+), 15.6% for (84)Kr(17+), and 13.7% for (85)Rb(19+) with typical breeding times of 10 ms∕charge state. For the first radioactive beams, a charge breeding efficiency of 11.7% has been achieved for (143)Cs(27+) and 14.7% for (143)Ba(27+). The project has been commissioned with a radioactive beam of (143)Ba(27+) accelerated to 6.1 MeV∕u. In order to take advantage of its lower residual contamination, an EBIS charge breeder will replace the ECR charge breeder in the next two years. The advantages and disadvantages of the two techniques are compared taking into account the requirements of the next generation radioactive beam facilities.

  20. Analytical development of the sup 252 Cf-plasma desorption mass spectroscopy for the structure analysis of biopolymers and synthetic polymers. Analytische Entwicklung der sup 252 Cf-Plasmadesorptions-Massenspektrometrie zur Strukturanalyse von Biopolymeren und synthetischen Polymeren

    Energy Technology Data Exchange (ETDEWEB)

    Schneider, K.

    1991-01-01

    The dissertation had the following aims: A systematic, analytical development of the plasma desorption method, and applications of the plasma desorption mass spectroscopy (PDMS) in primary structure investigations of polypeptides and proteins, and for the determination of the molecular weight of synthetic polymers. For the analytical development of the PDMS, aspects of main interest were the preparation and characterization techniques, and systematic model investigations of the analytical sensitivity, reproducibility and accuray of the molecular weight determination, as well as of the mixture analysis. The objective in the second part of the dissertation was to show application potentials and limits of the PDMS within the framework of analytical tasks of a primary structure characterization of polypeptides and proteins, as well as with regard to the determination of molecular weight and molecular weight distribution of synthetic polymers. (orig.).

  1. 48 CFR 252.225-7035 - Buy American Act-Free Trade Agreements-Balance of Payments Program Certificate.

    Science.gov (United States)

    2010-10-01

    ... Item Number)(Country of Origin) (iii) The following supplies are other foreign end products, including... definition of “domestic end product”: (Line Item Number) (Country of Origin (If known)) (End of provision...,” “component,” “domestic end product,” “Free Trade Agreement country,” “Free Trade Agreement country...

  2. SU-E-T-252: On the Evaluation of Patient Specific IMRT QA Using EPID, Dynalog Files and Patient Anatomy

    Energy Technology Data Exchange (ETDEWEB)

    Defoor, D; Stathakis, S; Mavroidis, P; Papanikolaou, N [University of Texas Health Science Center, UTHSCSA, San Antonio, TX (United States); Vazquez Quino, L [Midsouth Radation Physics, Little Rock, AR (United States)

    2014-06-01

    Purpose: This research, investigates the viability of using the Electronic portal imaging device (EPID) coupled with the treatment planning system (TPS), to calculate the doses delivered and verify agreement with the treatment plan. The results of QA analysis using the EPID, Delta4 and fluence calculations using the multi-leaf collimator (MLC) dynalog files on 10 IMRT patients are presented in this study. Methods: EPID Fluence Images in integrated mode and Dynalog files for each field were acquired for 10 IMRT (6MV) patients and processed through an in house MatLab program to create an opening density matrix (ODM) which was used as the input fluence for dose calculation with the TPS (Pinnacle3, Philips). The EPID used in this study was the aSi1000 Varian on a Novalis TX linac equipped with high definition MLC. The resulting dose distributions were then exported to VeriSoft (PTW) where a 3D gamma was calculated using 3mm-3% criteria. The Scandidos Delta4 phantom was also used to measure a 2D dose distribution for all 10 patients and a 2D gamma was calculated for each patient using the Delta4 software. Results: The average 3D gamma for all 10 patients using the EPID images was 98.2% ± 2.6%. The average 3D gamma using the dynalog files was 94.6% ± 4.9%. The average 2D gamma from the Delta4 was 98.1% ± 2.5%. The minimum 3D gamma for the EPID and dynalog reconstructed dose distributions was found on the same patient which had a very large PTV, requiring the jaws to open to the maximum field size. Conclusion: Use of the EPID, combined with a TPS is a viable method for QA of IMRT plans. A larger ODM size can be implemented to accommodate larger field sizes. An adaptation of this process to Volumetric Arc Therapy (VMAT) is currently under way.

  3. Characterization of epibenthic and demersal megafauna at Mississippi Canyon 252 shortly after the Deepwater Horizon Oil Spill.

    Science.gov (United States)

    Valentine, Marla M; Benfield, Mark C

    2013-12-15

    The Deepwater Horizon Oil Spill resulted in the release of a large quantity of oil and gas into the northern Gulf of Mexico from a bathypelagic source. Due to a lack of pre-spill quantitative data the baseline condition of the communities near the spill site is unknown. This makes it difficult to determine the impact of the spill on deepwater megafauna. Remotely operated vehicles were used to quantify megafauna at five study sites during August and September 2010:2000 m north, west, south, and east, and 500 m north of the Macondo well. Comparisons of animal abundances indicated that 2000 m-N and 2000 m-W had the greatest taxonomic richness and highest abundances while 2000 m-E had slightly lower values. In contrast 500 m-N and 2000 m-S had the lowest taxonomic richness and abundances. Our study also suggests that certain taxa were potentially more resistant or sensitive to the spill.

  4. 75 FR 32273 - Safety Zone; DEEPWATER HORIZON at Mississippi Canyon 252 Outer Continental Shelf MODU in the Gulf...

    Science.gov (United States)

    2010-06-08

    ... collisions, oil spills, and releases of natural gas, and thereby protect the safety of life, property, and... request, the Coast Guard explored relevant safety factors and considered several criteria, including but... extending to the limits of the Exclusive Economic Zone (EEZ) ] contiguous to the territorial sea of...

  5. 75 FR 26091 - Safety Zone; Riser for DEEPWATER HORIZON at Mississippi Canyon 252 Outer Continental Shelf MODU...

    Science.gov (United States)

    2010-05-11

    ... of natural gas, and thereby protect the safety of life, property, and the environment. Oil response... operating vehicles. In evaluating the need for the safety zone, the Coast Guard explored relevant safety...) contiguous to the territorial sea of the United States and extending to a distance up to 200 nautical...

  6. 48 CFR 252.225-7043 - Antiterrorism/force protection policy for defense contractors outside the United States.

    Science.gov (United States)

    2010-10-01

    ... foreign government; or (3) A foreign corporation wholly owned by a foreign government. (d) Information and... contract, shall— (1) Affiliate with the Overseas Security Advisory Council, if the Contractor...

  7. SU-E-T-252: Developing a Pencil Beam Dose Calculation Algorithm for CyberKnife System

    Energy Technology Data Exchange (ETDEWEB)

    Liang, B [Image processing center, Beihang University, Beijing (China); Duke University Medical Center, Durham, NC (United States); Liu, B; Zhou, F [Image processing center, Beihang University, Beijing (China); Xu, S [Chinese PLA General Hospital, Beijing (China); Wu, Q [Duke University Medical Center, Durham, NC (United States)

    2015-06-15

    Purpose: Currently there are two dose calculation algorithms available in the Cyberknife planning system: ray-tracing and Monte Carlo, which is either not accurate or time-consuming for irregular field shaped by the MLC that was recently introduced. The purpose of this study is to develop a fast and accurate pencil beam dose calculation algorithm which can handle irregular field. Methods: A pencil beam dose calculation algorithm widely used in Linac system is modified. The algorithm models both primary (short range) and scatter (long range) components with a single input parameter: TPR{sub 20}/{sub 10}. The TPR{sub 20}/{sub 20}/{sub 10} value was first estimated to derive an initial set of pencil beam model parameters (PBMP). The agreement between predicted and measured TPRs for all cones were evaluated using the root mean square of the difference (RMSTPR), which was then minimized by adjusting PBMPs. PBMPs are further tuned to minimize OCR RMS (RMSocr) by focusing at the outfield region. Finally, an arbitrary intensity profile is optimized by minimizing RMSocr difference at infield region. To test model validity, the PBMPs were obtained by fitting to only a subset of cones (4) and applied to all cones (12) for evaluation. Results: With RMS values normalized to the dmax and all cones combined, the average RMSTPR at build-up and descending region is 2.3% and 0.4%, respectively. The RMSocr at infield, penumbra and outfield region is 1.5%, 7.8% and 0.6%, respectively. Average DTA in penumbra region is 0.5mm. There is no trend found in TPR or OCR agreement among cones or depths. Conclusion: We have developed a pencil beam algorithm for Cyberknife system. The prediction agrees well with commissioning data. Only a subset of measurements is needed to derive the model. Further improvements are needed for TPR buildup region and OCR penumbra. Experimental validations on MLC shaped irregular field needs to be performed. This work was partially supported by the National Natural Science Foundation of China (61171005) and the China Scholarship Council (CSC)

  8. Corrigendum to "Galoisian obstruction to the integrability of general dynamical systems" [J. Differ. Equ. 252 (10) (2012) 5518-5534

    Science.gov (United States)

    Li, Wenlei; Shi, Shaoyun

    2017-02-01

    We are very sorry that the statement "the identity component G10 of G1 has at most n - m - 1 generators" in Theorem 7 of our paper mentioned in the title of this Corrigendum, is in general not correct, which leads to incorrectness of the last two statements in Theorem 7. The mistake leading to this is in the proof of Theorem 7, lines 7 and 8, i.e., "the tangent space of Hc is an (n - m - 1)-dimensional space containing linear vector fields { T (x) | T ∈G1 }", which is not correct in fact, since the space does not contain, but is tangent to, these linear vector fields. By more discussion, we have modified our proof and obtained some similar results, which we think, is also interesting, and can be surely applied to illustrate all the example of our paper. Now we give the modified theorem and its proof for Theorem 7. In the present erratum, all numbers for equations and systems are referred to those in the original paper.

  9. 48 CFR 252.251-7001 - Use of Interagency Fleet Management System (IFMS) vehicles and related services.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Use of Interagency Fleet... Fleet Management System (IFMS) vehicles and related services. As prescribed in 251.205, use the following clause: Use of Interagency Fleet Management System (IFMS) Vehicles and Related Services (DEC...

  10. 48 CFR 252.225-7036 - Buy American Act-Free Trade Agreements-Balance of Payments Program.

    Science.gov (United States)

    2010-10-01

    ... Agreement country means Australia, Bahrain, Canada, Chile, Costa Rica, Dominican Republic, El Salvador, Guatemala, Honduras, Mexico, Morocco, Nicaragua, Peru, or Singapore; (8) Free Trade Agreement country end...) Canadian end product means an article that— (i) Is wholly the growth, product, or manufacture of Canada;...

  11. 48 CFR 252.225-7004 - Report of Intended Performance Outside the United States and Canada-Submission after Award.

    Science.gov (United States)

    2010-10-01

    ... and Canada—Submission After Award (OCT 2010) (a) Definition. United States, as used in this clause... DD Form 2139; and (2) May obtain copies of DD Form 2139 from the Contracting Officer or via the Internet at http://www.dtic.mil/whs/directives/infomgt/forms/formsprogram.htm. (End of clause)...

  12. SU-E-J-252: Reproducibility of Radiogenomic Image Features: Comparison of Two Semi-Automated Segmentation Methods

    Energy Technology Data Exchange (ETDEWEB)

    Lee, M; Woo, B; Kim, J [Seoul National University, Seoul (Korea, Republic of); Jamshidi, N; Kuo, M [UCLA School of Medicine, Los Angeles, CA (United States)

    2015-06-15

    Purpose: Objective and reliable quantification of imaging phenotype is an essential part of radiogenomic studies. We compared the reproducibility of two semi-automatic segmentation methods for quantitative image phenotyping in magnetic resonance imaging (MRI) of glioblastoma multiforme (GBM). Methods: MRI examinations with T1 post-gadolinium and FLAIR sequences of 10 GBM patients were downloaded from the Cancer Image Archive site. Two semi-automatic segmentation tools with different algorithms (deformable model and grow cut method) were used to segment contrast enhancement, necrosis and edema regions by two independent observers. A total of 21 imaging features consisting of area and edge groups were extracted automatically from the segmented tumor. The inter-observer variability and coefficient of variation (COV) were calculated to evaluate the reproducibility. Results: Inter-observer correlations and coefficient of variation of imaging features with the deformable model ranged from 0.953 to 0.999 and 2.1% to 9.2%, respectively, and the grow cut method ranged from 0.799 to 0.976 and 3.5% to 26.6%, respectively. Coefficient of variation for especially important features which were previously reported as predictive of patient survival were: 3.4% with deformable model and 7.4% with grow cut method for the proportion of contrast enhanced tumor region; 5.5% with deformable model and 25.7% with grow cut method for the proportion of necrosis; and 2.1% with deformable model and 4.4% with grow cut method for edge sharpness of tumor on CE-T1W1. Conclusion: Comparison of two semi-automated tumor segmentation techniques shows reliable image feature extraction for radiogenomic analysis of GBM patients with multiparametric Brain MRI.

  13. A Senior High School Social Studies Unit on Africa South of the Sahara. World History Series, Bulletin No. 252.

    Science.gov (United States)

    Kelly, Harry; And Others

    This secondary level curriculum guide provides a program and identifies materials for the study of the history and culture of Africa south of the Sahara. The primary purpose of this course is to stimulate thought and to encourage students to make valid generalizations and intelligent assessments of the forces and events that have and are shaping…

  14. The Response of an Albedo Neutron Dosimeter to Moderated AmBe and 252(Cf) Neutron Sources.

    Science.gov (United States)

    2014-09-26

    neutrons is deter- mined by making multiple integrations on the glow curves from the detectors [41, or by computer analysis of the glow curves [5-61...Falk, "A Personnel Neutron Dosimeter Using Lithium Fluoride Thermoluminescent Dosim- eters," Report No. RFP-1581, Dow Chemical Co., Golden CO (1971...Addison Wesley, Reading, MA, 1953). 18. D.E. Hankins, "Factors Affecting the Design of Albedo Neutron Dosimeters Containing Lithium Fluoride

  15. 47 CFR 25.252 - Special requirements for ancillary terrestrial components operating in the 2000-2020 MHz/2180...

    Science.gov (United States)

    2010-10-01

    ..., including takeoff and landing paths. (5) Exceed an aggregate power flux density of −51.8 dBW/m2 in a 1.23... 2200-2290 MHz band. (7) Generate EIRP density, averaged over any two millisecond active transmission... measure wideband EIRP density for purposes of this rule, and narrowband EIRP shall be measured with a...

  16. Health-hazard evaluation report No. HETA 90-252-2167, Northland Terrace Nursing and Rehabilitation Center, Columbus, Ohio

    Energy Technology Data Exchange (ETDEWEB)

    Hanley, K.W.; Deitchman, S.

    1991-12-01

    In response to a request from management at the Northland Terrace Nursing and Rehabilitation Center (SIC-8051), Columbus, Ohio, a study was undertaken of headaches in workers in the laundry facility and upper respiratory infections associated with delivering Attends diapers. The study included employee interviews, environmental monitoring, and an assessment of the adequacy of the design and performance of the heating, ventilating, and air conditioning system. Northland Terrace was a nursing and rehabilitation center. Employees who work in the laundry facility reported that they experience headache while present in this area which was renovated in 1989. Carbon-dioxide (124389) concentrations exceeded 1000 parts per million. Biologically significant carbon-monoxide (630080) concentrations were not observed. Temperatures in the laundry rooms ranged from 86 to 92 degrees-F. Relative humidities ranged from 48 to 56%. A possible reaction to the dust or the fragrance associated with Attends diapers was not followed to completion as the nursing facility stopped using this product during the study. The authors conclude that there was an inadequate supply of outside air in the laundry and basement areas. The authors recommend measures to improve the ventilation system and reduce the potential for heat stress in the laundry.

  17. Production of medical radioisotopes in the ORNL high flux isotope reactor (HFIR) for cancer treatment and arterial restenosis therapy after PICA

    Science.gov (United States)

    Knapp, F. F.; Beets, A. L.; Mirzadeh, S.; Alexander, C. W.; Hobbs, R. L.

    1999-01-01

    The High Flux Isotope Reactor ( HFIR) at the Oak Ridge National Laboratory ( ORNL) represents an important resource for the production of a wide variety of medical radioisotopes. First beginning operation in 1965, the high thermal neutron flux (2.5×1015 neutrons/cm2/sec at 85 MW) and versatile target irradiation and handling facilities provide the opportunity for production of a wide variety of neutron-rich medical radioisotopes of current interest for therapy. In addition to serving as a key production site for californium-252 and other transuranic elements, important examples of therapeutic radioisotopes which are currently routinely produced in the HFIR for distribution include dysprosium-166 (parent of holmium-166), rhenium-186, tin-117 m and tungsten-188 (parent of rhenium-188). The nine hydraulic tube ( HT) positions in the central high flux region permit the insertion and removal of targets at any time during the operating cycle (22-24 days) and have traditionally represented a major site for production of medical radioisotopes. To increase the irradiation capabilities of the HFIR, special target holders have recently been designed and fabricated which will be installed in the six Peripheral Target Positions ( PTP), which are also located in the high flux region. These positions are only accessible during reactor refueling and will be used for long-term irradiations, such as required for the production of tin-117 m and tungsten-188. Each of the PTP tubes will be capable of housing a maximum of eight HT targets, thus increasing the total maximum number of HT targets from the current nine, to a total of 57. In this paper the therapeutic use of reactor-produced radioisotopes for bone pain palliation and vascular brachytherapy and the therapeutic medical radioisotope production capabilities of the ORNL HFIR are briefly discussed.

  18. Monte Carlo modeling and analyses of YALINA-booster subcritical assembly part 1: analytical models and main neutronics parameters.

    Energy Technology Data Exchange (ETDEWEB)

    Talamo, A.; Gohar, M. Y. A.; Nuclear Engineering Division

    2008-09-11

    This study was carried out to model and analyze the YALINA-Booster facility, of the Joint Institute for Power and Nuclear Research of Belarus, with the long term objective of advancing the utilization of accelerator driven systems for the incineration of nuclear waste. The YALINA-Booster facility is a subcritical assembly, driven by an external neutron source, which has been constructed to study the neutron physics and to develop and refine methodologies to control the operation of accelerator driven systems. The external neutron source consists of Californium-252 spontaneous fission neutrons, 2.45 MeV neutrons from Deuterium-Deuterium reactions, or 14.1 MeV neutrons from Deuterium-Tritium reactions. In the latter two cases a deuteron beam is used to generate the neutrons. This study is a part of the collaborative activity between Argonne National Laboratory (ANL) of USA and the Joint Institute for Power and Nuclear Research of Belarus. In addition, the International Atomic Energy Agency (IAEA) has a coordinated research project benchmarking and comparing the results of different numerical codes with the experimental data available from the YALINA-Booster facility and ANL has a leading role coordinating the IAEA activity. The YALINA-Booster facility has been modeled according to the benchmark specifications defined for the IAEA activity without any geometrical homogenization using the Monte Carlo codes MONK and MCNP/MCNPX/MCB. The MONK model perfectly matches the MCNP one. The computational analyses have been extended through the MCB code, which is an extension of the MCNP code with burnup capability because of its additional feature for analyzing source driven multiplying assemblies. The main neutronics parameters of the YALINA-Booster facility were calculated using these computer codes with different nuclear data libraries based on ENDF/B-VI-0, -6, JEF-2.2, and JEF-3.1.

  19. Questions to the radiological protection in the Universidad Nacional Autonoma de Mexico; Cuestionamientos a la proteccion radiologica en la Universidad Nacional Autonoma de Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Salas M, B., E-mail: salasmarb@yahoo.com.mx [UNAM, Facultad de Ciencias, Departamento de Fisica, Circuito exterior s/n, Ciudad Universitaria, 04510 Mexico D. F. (Mexico)

    2014-08-15

    In the Physics Department of the Sciences Faculty of the Universidad Nacional Autonoma de Mexico (UNAM) exist at least 3 sites where radioactive sources and generating equipment s of ionizing radiation are managed: The Modern Physics Laboratory, the Radiological Analysis of Environmental Samples Workshop and the Collisions Workshop; the first of them has two neutron sources, in addition to other emitted sources of gamma and beta radiation. The neutron sources are of Americium 241-Beryllium and other of Californium-252 which have been operated outside of the control of the Comision Nacional de Seguridad Nuclear y Salvaguardias (CNSNS) that is the regulator organ in Mexico in nuclear matter, because the Operation License No. 183/85, with file number 657 that protected them, lost their validity from August 13, 1987 (25 years behind), what motivated to that the CNSNS assured them. Later to the closing of the Radiological Analysis of Environmental Samples Workshop was believed that a Barium-133 source had been extracted in an illegal way; an investigation realized by the CNSNS determined that the radioactive source was always inside of the detection systems and radiation measurement, for what this source was never lost. In the Collisions Workshop operated an Experimental Accelerator of Particles that the CNSNS prohibited its operation for not having the corresponding license. These examples can be considered as bad practices of radiological protection that should be pointed out to eradicate their promotion and to avoid this way the exposure to the radiation of the occupational exposed personnel and people in general, being also avoided dose of unnecessary radiation. The Instituto Federal de Acceso a la Informacion Publica y Proteccion de Datos (IFAI) in Mexico was a key factor to obtain the information that allowed the realization of this work that was carried out in the Sciences Faculty of the UNAM. (Author)

  20. Temporal and Spatial Characterization of Macondo 252 Signatures in Gulf of Mexico Shelf and Slope Sediments: Evidence for Weathering, Biodegradation, and Transport

    Science.gov (United States)

    Woodruff, O. P.; Yeager, K. M.; Wade, T.; Louchouarn, P.; Bonner, S.; Rutledge, M. H.

    2014-12-01

    The long-term fate of hydrocarbons in the Gulf of Mexico (GOMx) following the 2010 Deepwater Horizon oil spill has yet to be fully characterized. Elemental (% C and % N), stable isotopes (δ13Corganic), and polycyclic aromatic hydrocarbon (PAH) molecular signatures were investigated in shelf and slope sediments collected in October 2010 and 2011 to gain insight into processes affecting the distribution and fate of spilled Macondo oil. Particulate organic carbon (POC) ranged between 1.55 and 2.22 wt. % in 2010, and between 0.55 and 2.06 % in 2011, while the corresponding δ13Corganic ranges were from -23.37 to -20.77 ‰ (vs. PDB (Pee Dee Belemnite)) in 2010, and -22.68 to -20.75 ‰ (vs. PDB) in 2011. Ranges of total polycyclic aromatic hydrocarbon (TPAH) concentrations were from 72.57 to 7,543.53 ng/g in 2010 and 25.55 to 16,582.77 ng/g in 2011.The significant findings of this study are: a) sediments in 2010 and 2011 both display a deviation from the background signature of GOMx seafloor sediments through elevated POC concentrations, elevated OC:N ratios, depleted δ13Corganic, elevated TPAH concentrations, and a PAH signature dominated by petrogenic source materials, b) sediments collected 19 months after the Deepwater Horizon event display evidence of biodegraded and weathered oil, through decreased POC concentrations and OC:N, enriched δ13Corganic values, decreased TPAH concentrations, and alkyl homologue distributions characteristic of a biodegraded or weathered petrogenic source of PAHs, and c) physical processes that have distributed Macondo oil as indicated by the strong relationship of δ13Corganic (in 2010 and 2011) with longitude, in accordance with previous investigations that have characterized a west, southwest trending subsurface hydrocarbon plume that extended west from the Macondo well.

  1. Genome-wide association analysis of self-reported events in 6135 individuals and 252 827 controls identifies 8 loci associated with thrombosis

    DEFF Research Database (Denmark)

    Hinds, David A; Buil, Alfonso; Ziemek, Daniel

    2016-01-01

    A2, ILF3 and AP1M2 as the three most plausible candidate genes for the chromosome 19 locus, our only genome-wide significant thrombosis-related locus that does not harbor likely coagulation-related genes. In addition, we present data showing that this locus also acts as a novel risk factor...... locus near SLC44A2 In addition, our study reports for the first time a genome-wide significant association between rs114209171, located upstream of the F8 structural gene, and thrombosis risk. Analyses of expression profiles and expression quantitative trait loci across different tissues suggested SLC44...... for stroke and coronary artery disease (CAD). In conclusion, our study reveals novel common genetic risk factors for VTE, stroke and CAD and provides evidence that self-reported data on blood clots used in a GWAS yield results that are comparable with those obtained using clinically diagnosed VTE...

  2. Dispersants as used in response to the MC252-spill lead to higher mobility of polycyclic aromatic hydrocarbons in oil-contaminated Gulf of Mexico sand.

    Directory of Open Access Journals (Sweden)

    Alissa Zuijdgeest

    Full Text Available After the explosion of the Deepwater Horizon oil rig, large volumes of crude oil were washed onto and embedded in the sandy beaches and sublittoral sands of the Northern Gulf of Mexico. Some of this oil was mechanically or chemically dispersed before reaching the shore. With a set of laboratory-column experiments we show that the addition of chemical dispersants (Corexit 9500A increases the mobility of polycyclic aromatic hydrocarbons (PAHs in saturated permeable sediments by up to two orders of magnitude. Distribution and concentrations of PAHs, measured in the solid phase and effluent water of the columns using GC/MS, revealed that the mobility of the PAHs depended on their hydrophobicity and was species specific also in the presence of dispersant. Deepest penetration was observed for acenaphthylene and phenanthrene. Flushing of the columns with seawater after percolation of the oiled water resulted in enhanced movement by remobilization of retained PAHs. An in-situ benthic chamber experiment demonstrated that aromatic hydrocarbons are transported into permeable sublittoral sediment, emphasizing the relevance of our laboratory column experiments in natural settings. We conclude that the addition of dispersants permits crude oil components to penetrate faster and deeper into permeable saturated sands, where anaerobic conditions may slow degradation of these compounds, thus extending the persistence of potentially harmful PAHs in the marine environment. Application of dispersants in nearshore oil spills should take into account enhanced penetration depths into saturated sands as this may entail potential threats to the groundwater.

  3. 48 CFR 252.211-7007 - Reporting of Government-Furnished Equipment in the DoD Item Unique Identification (IUID) Registry.

    Science.gov (United States)

    2010-10-01

    ... for sale, and does not ordinarily lose its identity or become a component part of another article when...). (iv) Added or removed code/flag. (v) Marker code (designates which code is used in the...

  4. Dispersants as used in response to the MC252-Spill Lead to higher mobility of polycyclic aromatic hydrocarbons in oil-contaminated Gulf of Mexico sand

    NARCIS (Netherlands)

    Zuijdgeest, A.; Huettel, M.

    2012-01-01

    After the explosion of the Deepwater Horizon oil rig, large volumes of crude oil were washed onto and embedded in the sandy beaches and sublittoral sands of the Northern Gulf of Mexico. Some of this oil was mechanically or chemically dispersed before reaching the shore. With a set of laboratory-colu

  5. Oil-material fractionation in Gulf deep water horizontal intrusion layer: Field data analysis with chemodynamic fate model for Macondo 252 oil spill.

    Science.gov (United States)

    Melvin, A T; Thibodeaux, L J; Parsons, A R; Overton, E; Valsaraj, K T; Nandakumar, K

    2016-04-15

    Among the discoveries of the Deepwater Horizon blowout was the so-called "sub-surface plume"; herein termed the "oil-trapping layer". Hydrocarbons were found positioned at ~1100-1300m with thickness ~100-150m and moving horizontally to the SW in a vertically stratified layer at the junction of the cold abyssal water and the permanent thermocline. This study focuses on its formation process and fate of the hydrocarbons within. The originality of this work to the field is two-fold, first it provides a conceptual framework which places layer origin in the context of a horizontal "intrusion" from the near-field, vertical, blow-out plume and second, it offers a theoretical model for the hydrocarbon chemicals within the horizontal layer as it moves far-afield. The model quantifies the oil-material fractionation process for the soluble and fine particle. The classical Box model, retrofitted with an internal gradient, the "G-Box", allows an approach that includes turbulent eddy diffusion coupled with droplet rise velocity and reactive decay to produce a simple, explicit, transparent, algebraic model with few parameters for the fate of the individual fractions. Computations show the soluble and smallest liquid droplets moving very slowly vertically through the layer appearing within the trapping layer at low concentration with high persistence. The larger droplets move-through this trapping zone quickly, attain high concentrations, and eventually form the sea surface slick. It impacts the field of oil spill engineering science by providing the conceptual idea and the algorithms for projecting the quantities and fractions of oil-material in a deep water, horizontal marine current being dispersed and moving far afield. In the field of oil spill modeling this work extends the current generation near-field plume source models to the far-field. The theory portrays the layer as an efficient oil-material trap. The model-forecasted concentration profiles for alkanes and aromatics against the available field data support the proposed theory and the resulting model.

  6. Maria Victoria Navas Sánchez-Élez, Romancero y cancionero de los Navalmorales (toledo), Los Navalmorales, Vientos del Pueblo, 2002, 252 pp.

    OpenAIRE

    González, Raúl Eduardo

    2007-01-01

    Los Navalmorales es una comunidad agrícola de alrededor de 2695 habitantes ubicada en el suroeste de la provincia de Toledo, España, en la comunidad autónoma de Castilla-La Mancha, cerca de los límites con Extremadura. En el volumen aquí reseñado se publica un rico panorama del acervo de romances y cantos cultivados en la localidad, aprovechando la labor previa de algunos recopiladores locales de romances, canciones y coplas, como el trabajo de campo emprendido por María Victoria Navas Sán...

  7. Characterization of surface oil thickness distribution patterns observed during the Deepwater Horizon (MC-252) oil spill with aerial and satellite remote sensing.

    Science.gov (United States)

    Svejkovsky, Jan; Hess, Mark; Muskat, Judd; Nedwed, Tim J; McCall, Jenifer; Garcia, Oscar

    2016-09-15

    Knowledge of the spatial distribution of oil thickness patterns within an on-water spill is of obvious importance for immediate spill response activities as well as for subsequent evaluation of the spill impacts. For long-lasting continuous spills like the 2010 3-month Deepwater Horizon (DWH) event in the Gulf of Mexico, it is also important to identify changes in the dominant oil features through time. This study utilized very high resolution (≤5m) aerial and satellite imagery acquired during the DWH spill to evaluate the shape, size and thickness of surface oil features that dominated the DWH slick. Results indicate that outside of the immediate spill source region, oil distributions did not encompass a broad, varied range of thicknesses. Instead, the oil separated into four primary, distinct characterizations: 1) invisible surface films detectable only with Synthetic Aperture Radar imaging because of the decreased surface backscatter, 2) thicker sheen & rainbow areas (oil (>1mm) that were consistently hundreds of meters long but most commonly only 10-50m wide. Where present within the slick footprint, each of the three distinct visible oil thickness classes maintained its shape characteristics both spatially (at different distances from the source and in different portions of the slick), and temporally (from mid-May through July 2010). The region over the source site tended to contain a more continuous range of oil thicknesses, however, our results indicate that the continuous injection of subsurface dispersants starting in late May significantly altered (lowered) that range. In addition to characterizing the oil thickness distribution patterns through the timeline of one of the world's largest oil spills, this paper also details the extension of using high resolution aerial imagery to calibrate medium resolution satellite data sources such as USA's Thematic Mapper (30m) to provide larger-scale spatial views of major spills, and discusses implications for utilizing such data for oil spill characterizations and spill response.

  8. Antidepressant use and risk for mortality in 121,252 heart failure patients with or without a diagnosis of clinical depression

    DEFF Research Database (Denmark)

    Brouwers, Corline; Christensen, Stefan B; Damen, Nikki L

    2016-01-01

    of clinical depression were independently associated with antidepressant use. Patients using no antidepressants with clinical depression and patients using antidepressants, with or without clinical depression, had a significantly higher risk for all-cause mortality (HR, 1.25; 95% CI, 1.15-1.36; HR, 1.24; 95....... CONCLUSION: Patients with HF taking antidepressants had an increased risk for all-cause and CV-mortality, irrespectively of having clinical depression. These results highlight the importance of further examining the antidepressant prescription pattern in patients with HF, as this may be crucial......BACKGROUND: Depression is a risk factor for mortality in patients with heart failure (HF), however, treating depression with antidepressant therapy does not seem to improve survival. We examined the prevalence of antidepressant use in HF patients, the correlates of antidepressant use subsequent...

  9. The 1-way on-line coupled model system MECO(n) - Part 4: Chemical evaluation (based on MESSy v2.52)

    Science.gov (United States)

    Mertens, Mariano; Kerkweg, Astrid; Jöckel, Patrick; Tost, Holger; Hofmann, Christiane

    2016-10-01

    For the first time, a simulation incorporating tropospheric and stratospheric chemistry using the newly developed MECO(n) model system is performed. MECO(n) is short for MESSy-fied ECHAM and COSMO models nested n times. It features an online coupling of the COSMO-CLM model, equipped with the Modular Earth Submodel System (MESSy) interface (called COSMO/MESSy), with the global atmospheric chemistry model ECHAM5/MESSy for Atmospheric Chemistry (EMAC). This online coupling allows a consistent model chain with respect to chemical and meteorological boundary conditions from the global scale down to the regional kilometre scale. A MECO(2) simulation incorporating one regional instance over Europe with 50 km resolution and one instance over Germany with 12 km resolution is conducted for the evaluation of MECO(n) with respect to tropospheric gas-phase chemistry. The main goal of this evaluation is to ensure that the chemistry-related MESSy submodels and the online coupling with respect to the chemistry are correctly implemented. This evaluation is a prerequisite for the further usage of MECO(n) in atmospheric chemistry-related studies. Results of EMAC and the two COSMO/MESSy instances are compared with satellite, ground-based and aircraft in situ observations, focusing on ozone, carbon monoxide and nitrogen dioxide. Further, the methane lifetimes in EMAC and the two COSMO/MESSy instances are analysed in view of the tropospheric oxidation capacity. From this evaluation, we conclude that the chemistry-related submodels and the online coupling with respect to the chemistry are correctly implemented. In comparison with observations, both EMAC and COSMO/MESSy show strengths and weaknesses. Especially in comparison to aircraft in situ observations, COSMO/MESSy shows very promising results. However, the amplitude of the diurnal cycle of ground-level ozone measurements is underestimated. Most of the differences between COSMO/MESSy and EMAC can be attributed to differences in the dynamics of both models, which are subject to further model developments.

  10. 48 CFR 252.225-7040 - Contractor Personnel Authorized to Accompany U.S. Armed Forces Deployed Outside the United States.

    Science.gov (United States)

    2010-10-01

    ... planning activities; and (C) Identify ways to utilize safety and security personnel and other resources... Tracker (SPOT) web-based system, at http://www.dod.mil/bta/products/spot.html, to enter and maintain...

  11. Parlar Dal Emel (éd., La politique turque en question - Entre imperfections et adaptations, Paris, L’Harmattan, 2012, 252 p.

    Directory of Open Access Journals (Sweden)

    Laurent Mallet

    2014-06-01

    Full Text Available Cet ouvrage collectif part de l’hypothèse selon laquelle l’interpénétration et l’interdépendance des enjeux de politique intérieure et de politique extérieure auraient connu un «accroissement considérable» depuis l’arrivée au pouvoir de l’AKP en 2002. L’objet du livre est donc d'interroger cette «zone grise» de la politique turque autour d’enjeux domestiques comprenant une dimension externe, définissant ainsi un espace « intermestique », contraction d’international et de domestique que l’on d...

  12. Roussillon Alain, Identité et modernité. Les voyageurs égyptiens au Japon (xixe - xxe siècle, Arles, Actes Sud, 2005, 252 p.

    Directory of Open Access Journals (Sweden)

    Thomas Brisson

    2009-11-01

    Full Text Available On pourrait appliquer au livre d’Alain Roussillon le principe que celui-ci voit à l’œuvre chez les voyageurs égyptiens au Japon : l’éloignement est manière de faire retour vers soi. Ainsi, alors que l’auteur aborde un objet nouveau, Identité et Modernité poursuit en réalité les questionnements plus anciens qui ont traversé son œuvre : le mouvement réformiste arabe/musulman, les transformations sociales qu’il accompagne, la part qu’y prennent les intellectuels. C’est bien, ici, du monde arabe,...

  13. Effects of ISS equivalent ionizing radiation dose on Human T-lymphocytes

    Science.gov (United States)

    Meloni, Maria Antonia; Pani, Giuseppe; Benotmane, Rafi; Mastroleo, Felice; Aboul-El-Ardat, Khalil; Janssen, Ann; Leysen, Liselotte; Vanhavere, Filip; Leys, Natalie; Galleri, Grazia; Pippia, Proto; Baatout, Sarah

    One of the objectives of the current international space programs is to investigate the effects of cosmic environment on Humans. It is known that during a long exposure to the space conditions, including ionizing radiations and microgravity, the immune system of the astronauts is impaired. In past years several experiments were performed to identify responsible factors of in vitro mitogenic activation process in human T-lymphocytes under simulated microgravity effect and during dedicated space missions. It come out that the lack of immune response in microgravity occurs at the cellular and molecular level. In order to evaluate effects on pure primary T-lymphocytes from peripheral blood exposed to International Space Station (ISS)-like ionizing radiation, we applied a mixture of Cesium-137, as representative of low energy particles, and Californium-252, as representative of hight energy particles, with rate similar to those monitored inside the ISS during previous space mission (Goossens et all. 2006). This facility is available at SCK•CEN (Belgium) (Mastroleo et al., 2009). Although the dose received by the cells was relatively low, flow cytometry analysis 24 hours after irradiation showed a decrease in cell viability coupled with the increase of the caspase-3 activity. However, Bcl-2 activity did not seem to be affected by the radiation. Furthermore, activation of cells induced an increase of the cell size and alteration of cellular morphology. Cell cycle as well as 8-oxo-G were also modified upon radiation and activation. Gene expression analysis shows a modulation of genes rather as a consequence of exposure than with the activation status. 330 genes have been identified to be significantly modulated in function of the time and have been grouped in four different cluster representing significant expression profiles. Preliminary functional analysis shows mainly genes involved in the immune response and inflammatory diseases as well as oxidative stress and

  14. Robotics Use in Source Recovery at the Savannah River Site

    Energy Technology Data Exchange (ETDEWEB)

    Lewis, C.W.

    2001-01-10

    The Department of Energy's Savannah River Site (SRS) in Aiken South Carolina has a state of the art Instrument Calibrations facility that supports calibration and repair of an inventory of approximately 8000 portable radiological monitoring instruments. The Instrument Calibrations facility began operations in 1996. The Low Scatter Irradiator (LSI) system is a key part of the facility. The LSI room is a shielded 40-foot by 40-foot by 40-foot room designed to minimize radiation scatter during calibrations and evaluations. Aluminum floor grating with one-inch spacing is part of the design to minimize scatter. A shielded source storage carousel is used to select calibration sources via a computer-controlled system. The carousel has eight source slots with seven sources used providing a selection of 60Cobalt, 137Cesium, and 252Californium sources of different intensities. One slot is used for a dummy source for system function testing. Sources are contained in an aluminum container known as the source rabbit. Air pressure is used to blow the selected source through a transfer tube to the top of the tube where it is held in place by a suction cup and a maintained air vacuum. During calibrations, instruments are placed on four LSI tracks that move instruments to the proper distance from the source for the desired calibrated exposure rate. Sources are returned to the carousel using gravity with multiple interlocks and safeguards built into the system to ensure that the source has dropped before entry into the LSI after a source exposure. Two room radiation monitors provide a remote reading to the operator from the computer console as another indicator of the source status. Due to the design of the LSI, it was assumed that a source could not become lodged in the transfer tube. That proved to be a false assumption when in May 2000, a source did not return to its home position. At this time, the LSI was being tested due to some apparent difficulties in sources being held

  15. 78 FR 12252 - Energy Efficiency Program for Commercial and Industrial Equipment: Public Meeting and...

    Science.gov (United States)

    2013-02-22

    ...Detail;dct=FR%252BPR%252BN%252BO%252BSR%252BPS;rpp=25;po=0;D=EER E-2012-BT-STD-0029. This Web page... Standard 90.1- 1999. 73 FR 58772 (Oct. 7, 2008). Section 305 of the Energy Independence and Security Act...

  16. Characterization of the occupational exposure and air transported particles using the techniques of PIXE {sup 252}Cf PMDS and alpha spectrometry; Caracterizacao da exposicao ocupacional e particulas transportadas pelo ar utilizando as tecnicas de PIXE {sup 252}Cf PDMS e espectrometria alfa

    Energy Technology Data Exchange (ETDEWEB)

    Carneiro, Luana Gomes

    2008-07-01

    The risk for human health due to exposure to aerosols depends on the intake pattern, the mass concentration and the speciation of the elements present in airborne particles. In this work PDMS (Plasma Desorption Mass Spectrometry) was used as complementary technique to the PIXE (Particle Induced X ray Emission) technique to characterize aerosols samples collected in the environment. The PIXE technique allows the identification of the elements present in the sample and to determine their mass concentrations. The mass spectrometry (PDMS) was used to identify the speciation of these elements present in the samples. The aerosol samples were collected using a six stage cascade impactor in three sites. The Mass Median Aerodynamic Diameter (MMAD) measured indicated that the airborne particulate were in the fine fraction of the aerosols. The theoretical uranium concentration in urine samples using ICRP lung model parameters suggest that the elemental mass concentration in respirable fraction of aerosol and the chemical speciation are important factors to determine the uranium concentration in urine and that the determination of specific solubility parameters for each compound is the most important factor to calculate the uranium concentration in urine. PIXE allows to identify and quantify the elements heavier than Na (Z=11) while PDMS allows to identify the organic and inorganic compounds present in the samples. As these techniques are used as complementary techniques they provide important information about the aerosols characterization. (author)

  17. 48 CFR 204.1202 - Solicitation provision and contract clause.

    Science.gov (United States)

    2010-10-01

    ...) 252.209-7005, Reserve Officer Training Corps and Military Recruiting on Campus. (ii) 252.212-7000..., Secondary Arab Boycott of Israel. (vii) 252.225-7035, Buy American Act—Free Trade Agreements—Balance...

  18. Physics division annual report 2005.

    Energy Technology Data Exchange (ETDEWEB)

    Glover, J.; Physics

    2007-03-12

    This report highlights the research performed in 2005 in the Physics Division of Argonne National Laboratory. The Division's programs include operation of ATLAS as a national user facility, nuclear structure and reaction research, nuclear theory, medium energy nuclear research and accelerator research and development. The mission of Nuclear Physics is to understand the origin, evolution and structure of baryonic matter in the universe--the matter that makes up stars, planets and human life itself. The Division's research focuses on innovative new ways to address this mission and 2005 was a year of great progress. One of the most exciting developments is the initiation of the Californium Rare Ion Breeder Upgrade, CARIBU. By combining a Cf-252 fission source, the gas catcher technology developed for rare isotope beams, a high-resolution isobar separator, and charge breeding ECR technology, CARIBU will make hundreds of new neutron-rich isotope beams available for research. The cover illustration shows the anticipated intensities of low-energy beams that become available for low-energy experiments and for injection into ATLAS for reacceleration. CARIBU will be completed in early 2009 and provide us with considerable experience in many of the technologies developed for a future high intensity exotic beam facility. Notable results in research at ATLAS include a measurement of the isomeric states in {sup 252}No that helps pin down the single particle structure expected for superheavy elements, and a new low-background measurement of {sup 16}N beta-decay to determine the {sup 12}C({alpha},{gamma}){sup 16}O reaction rate that is so important in astrophysical environments. Precise mass measurements shed new light on the unitarity of the quark weak-mixing matrix in the search for physics beyond the standard model. ATLAS operated for 4686 hours of research in FY2005 while achieving 95% efficiency of beam delivery for experiments. In Medium-Energy Physics, radium

  19. 76 FR 30089 - Submission for OMB Review; Comment Request

    Science.gov (United States)

    2011-05-24

    ... Application, FNS-252-C, Corporate Supplemental Application, and FNS 252-R, Supplemental Nutrition Assistance... reduced ability to effectively monitor accountability for program compliance and to detect fraud and...

  20. Discovery of Isotopes of the Transuranium Elements with 93 <= Z <= 98

    CERN Document Server

    Fry, C

    2012-01-01

    One hundred and five isotopes of the transuranium elements neptunium, plutonium, americium, curium, berkelium and californium have so far been observed; the discovery of these isotopes is discussed. For each isotope a brief summary of the first refereed publication, including the production and identification method, is presented.

  1. 76 FR 58140 - Defense Federal Acquisition Regulation Supplement; Annual Representations and Certifications...

    Science.gov (United States)

    2011-09-20

    ... Government of a Terrorist Country. (ii) 252.209-7005, Reserve Officer Training Corps and Military Recruiting...) 252.209-7005, Reserve Officer Training Corps and Military Recruiting on Campus. Applies to all.... (viii) 252.225-7031, Secondary Arab Boycott of Israel. (ix) 252.225-7035, Buy American Act--Free...

  2. AcEST: DK951559 [AcEST

    Lifescience Database Archive (English)

    Full Text Available agment) OS=Physcomi... 241 3e-62 tr|Q8H252|Q8H252_COCNU Retinoblastoma-like protein OS=Cocos nuci... 238 3e-...---------GFLSPAKDRPSA 667 >tr|Q8H252|Q8H252_COCNU Retinoblastoma-like protein OS=Cocos

  3. Comparison between effectiveness of a low-viscosity glass ionomer and a resin-based glutaraldehyde containing primer in treating dentine hypersensitivity--a 25.2-month evaluation.

    NARCIS (Netherlands)

    Polderman, R.N.; Frencken, J.E.F.M.

    2007-01-01

    OBJECTIVES: The null-hypothesis tested was; there is no difference in effectiveness between a new low-viscosity glass ionomer and a resin-based glutaraldehyde containing primer in treating hypersensitive teeth after 2 years. METHODS: Using a split-mouth design, hypersensitive teeth in 14 adult patie

  4. Corrigendum to "Crater functions for compound materials: A route to parameter estimation in coupled-PDE models of ion bombardment" [Nucl. Instr. Meth. Phys. Res. B 318B (2014) 245-252

    Science.gov (United States)

    Norris, Scott A.; Samela, Juha; Vestberg, Matias; Nordlund, Kai; Aziz, Michael J.

    2015-04-01

    Because Eq. (1) is independent of the details of the crater function Δh, updated formulae for { A, C,A‧,C‧ } that account for the curvature dependence are obtained simply by inserting Harrison and Bradley's expressions (2) into Eq. (1). As those authors show, at normal incidence the added terms are expected to have positive values, increasing estimates of C (which is a sum of SX,YZ, type terms), while producing a less noticable effect on the value of C‧ (which is a difference of SX,YZ, type terms). These modifications therefore do not alter the primary physical conclusions of our study, which are that for the GaSb system both C and (A‧ C -C‧ A) appear to be positive.

  5. Carcaça e não-componentes da carcaça de cordeiros recebendo polpa cítrica úmida prensada em substituição à silagem de milho - DOI: 10.4025/actascianimsci.v29i1.252 Carcass and non-carcass components of lambs fed with pressed citrus pulp replacing corn silage - DOI: 10.4025/actascianimsci.v29i1.252

    Directory of Open Access Journals (Sweden)

    Lina Yumi Noro

    2007-11-01

    Full Text Available O objetivo deste trabalho foi avaliar a substituição da silagem de milho pela polpa cítrica úmida prensada (PCUP sobre as características de carcaça e dos não-componentes da carcaça de cordeiros da raça Santa Inês. Vinte quatro cordeiros com idade média de 90 dias e peso vivo inicial médio de 18 kg foram confinados durante 67 dias, alimentados com dietas contendo níveis crescentes de PCUP em substituição à silagem de milho (0, 25, 50, 75% da MS. Não foi verificada diferença (p>0,05 para peso vivo ao abate (32,8 kg, rendimento de carcaça quente (44,7%, rendimento verdadeiro (50,3% e não-componentes da carcaça. Em relação aos rendimentos dos cortes, apenas o rendimento de lombo foi afetado (pThe objective of this study was to evaluate the replacement of corn silage by pressed citrus pulp (PCP on carcass characteristics and non-carcass components of Santa Ines lambs. Twenty-four lambs with average age of 90 days and initial weight of 18 kg were maintained in feedlot for 67 days, fed with increasing levels of PCP replacing corn silage (0, 25, 50, 75%, DM basis. There was no difference (p>0.05 for live weight at slaughter (32.8 kg, hot carcass yield (44.7%, true yield (50.3% and non-carcass components. In relation to cut yields, only loin yield was affected (p<0.05 by the diet, which showed quadratic response. For the carcass measurements, only the arm length was affected by the diet, showing quadratic behavior. The percentage of fat and muscle showed quadratic behavior according to replacement levels. The results suggest that pressed citrus pulp can substitute corn silage for lambs in feedlot without affecting the carcass characteristics and the non-carcass components.

  6. Dicty_cDB: Contig-U10543-1 [Dicty_cDB

    Lifescience Database Archive (English)

    Full Text Available ery: 193 aataatggggccnataataataattcanccagtggaatcattggtggttcaacaatttct 252 ||||||||||||||||||||||||||||||||||...|||||||||||||||||||||||||| Sbjct: 193 aataatggggccnataataataattcanccagtggaatcattg...gtggttcaacaatttct 252 Query: 253 ggtgaaaaggttaaaccaggggnatttgaaaaatatgtaaaagaaaagggnaatattcan 312 ||||||||||...|||||||||||||||||||||||||||||||||||||||||||||||||| Sbjct: 253 ggtgaaaaggttaaaccaggggnatttgaaaaatatgtaaaagaaaagggnaatattcan...||||||| ||||||||| Sbjct: 414 atttttcaaa-acaatataaaatgtggttctctggtttaaatatgtttagtttagaaatg 472 Query: 193 aataatggggccnataataataattcan

  7. Dicty_cDB: Contig-U14577-1 [Dicty_cDB

    Lifescience Database Archive (English)

    Full Text Available 1 gtggtntncaaccactgtgctcacatanttactactgtgtggttcagactanctgcgtcc 70 ||||||||||||||||||||||||||||||||||||||||||...|||||||||||||||||| Sbjct: 11 gtggtntncaaccactgtgctcacatanttactactgtgtggttcagactan...(204), Expect = e-109 Identities = 252/252 (100%) Strand = Plus / Minus Query: 12 tggtntncaaccactgtgctcacatan...3 tggtntncaaccactgtgctcacatanttactactgtgtggttcagactanctgcgtccc 194 Query: 72 nanc...ttactactgtgtggttcagactanctgcgtccc 71 |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Sbjct: 25

  8. 77 FR 4631 - Defense Federal Acquisition Regulation Supplement: New Designated Country-Armenia (DFARS Case...

    Science.gov (United States)

    2012-01-30

    ... ``designated country'' at DFARS 252.225-7021, Trade Agreements, and 252.225-7045, Balance of Payments Program... ``Designated country'', revise paragraph (1) to read as follows: 252.225-7045 Balance of Payments Program..., Estonia, Finland, France, Germany, Greece, Hong Kong, Hungary, Iceland, Ireland, Israel, Italy,...

  9. Some Physical Properties of Enamels Developed for Use at High Temperatures on Several Nonstrategic Steels

    Science.gov (United States)

    1951-10-01

    stainless-clad steel, the molybdenum steel and the titanium -boron steel were sand- blasted. The other metals were pickled satisfactorily according to...252-4t, 252-4ah, 252-4as, 252-4au, and 252-4av. The metals were Ingot Iron, 1010 steel, a molybdenum steel, two high manganese steels, a titanium -boron...steel, a titanium -bearing enameling steel "Ti-Namel", and a stainless-clad steel. The enameled specimens were subjected to adherence and thermal

  10. Comment on Spracklandus Hoser, 2009 (Reptilia, Serpentes, ELAPIDAE): request for confirmation of availability of the generic name and for the nomenclatural validation of the journal in which it was published (Case 3601; BZN 70:234–237; 71:30–38; 133-135,181-182 ,252-253)

    Science.gov (United States)

    Rhodin, Anders G.J.; Kaiser, Hinrich; van Dijk, Peter Paul; Wüster, Wolfgang; O’Shea, Mark; Archer, Michael; Auliya, Mark; Boitani, Luigi; Bour, Roger; Clausnitzer, Viola; Contreras-MacBeath, Topiltzin; Crother, Brian I.; Daza, Juan M.; Driscoll, Carlos A.; Flores-Villela, Oscar; Frazier, Jack; Fritz, Uwe; Gardner, Alfred L.; Gascon, Claude; Georges, Arthur; Glaw, Frank; Grazziotin, Felipe G.; Groves, Colin P.; Haszprunar, Gerhard; Havaš, Peter; Hero, Jean-Marc; Hoffmann, Michael; Hoogmoed, Marinus S.; Horne, Brian D.; Iverson, John B.; Jäch, Manfred; Jenkins, Christopher L.; Jenkins, Richard K.B.; Kiester, A. Ross; Keogh, J. Scott; Lacher, Thomas E.; Lovich, Jeffrey E.; Luiselli, Luca; Mahler, D. Luke; Mallon, David P.; Mast, Roderic; McDiarmid, Roy W.; Measey, John; Mittermeier, Russell A.; Molur, Sanjay; Mosbrugger, Volker; Murphy, Robert W.; Naish, Darren; Niekisch, Manfred; Ota, Hidetoshi; Parham, James F.; Parr, Michael J.; Pilcher, Nicolas J.; Pine, Ronald H.; Rylands, Anthony B.; Sanderson, James G.; Savage, Jay M.; Schleip, Wulf; Scrocchi, Gustavo J.; Shaffer, H. Bradley; Smith, Eric N.; Sprackland, Robert; Stuart, Simon N.; Vetter, Holger; Vitt, Laurie J.; Waller, Tomás; Webb, Grahame; Wilson, Edward O.; Zaher, Hussam; Thomson, Scott

    2015-01-01

    In Case 3601 Raymond Hoser has asked the Commission to validate for the purposes of nomenclature the name Spracklandus Hoser, 2009, and ‘the journal in which it was published,’ issue 7 of the Australasian Journal of Herpetology (AJH). We note that the entire run of AJH has been written, edited, and published solely by Hoser. Although his requests to the Commission were presented as narrow and, in his words, ‘routine matters,’ we are convinced that they represent an important tipping-point with broad implications of major concern for zoological taxonomy and nomenclature as a whole and, by extension, the greater scientific community. Since Hoser’s actions and works have failed to follow scientific best practices (e.g. Turtle Taxonomy Working Group, 2007, 2014; Kaiser et al., 2013; Kaiser, 2014) and both the Commission’s general Recommendations and Code of Ethics in Appendix A, the global herpetological community has widely rejected his taxonomic decisions and resultant nomenclature. This has unfortunately caused a confusing dual nomenclature to develop in the herpetological community, with most boycotting or ignoring Hoser’s 700+ new names coined in the AJH, while he and a few personal followers actively promote their usage. We believe that suppression of the name Spracklandus, and all issues of AJH, is the only effective way to bring this contentious and confusing issue to resolution. The plenary power available under Article 81.1 of the Code exist specifically to allow the Commission to make rulings in individual cases that disturb stability and cause confusion, whether the works are Code-compliant or not. We maintain that it is in the interest of nomenclatural stability, not only for herpetology, but for all of zoological taxonomy, that the plenary power be invoked to declare the works in AJH unavailable, regardless of any narrow interpretation of their technical Code-compliance. We present our arguments for rejection of the validity of AJH in the following commentary. In view of the wide-reaching implications of this case for all of zoology, and reflecting the deep and broad-based community concern over these issues, our contributing authors include 70 global scientific leaders and accomplished amateurs from a wide variety of zoological disciplines.

  11. Synthesis and Crystal Structure of One Mixed- ligand Coordination Polymer Based on the Novel Terphenyl-2,5,2',5'-tetracarboxylic Acid Ligand%Synthesis and Crystal Structure of One Mixed- ligand Coordination Polymer Based on the Novel Terphenyl-2,5,2',5'-tetracarboxylic Acid Ligand

    Institute of Scientific and Technical Information of China (English)

    ZHANG Xiu-Tang; ZHANG Lu-Qing; ZHANG Liang-Dong; FAN Li-Ming; WEI Pei-Hai; ZHANG Shu-Xiang

    2012-01-01

    Solvothermal reaction of aromatic terphenyl-2,5,2',5'-tetracarboxylic acid (Hnqptc) ligand and the transitional metal cation of Mn11 in the presence of 3-(2-pyridyl)pyrazole (pp) affords one new coordination polymer, [Mn(qptc)0.5(pp)2]n·n(H2O) (1). The structure has been determined by single-crystal X-ray diffraction analyses and further characterized by elemental analyses, IR, TGA, and magnetism. The carboxyl groups of qptc4 exhibit a μ1-η1:η0 coordination mode, and the qptc4- acts as a H-shaped ligand linking the Mn11 centers together to form a 2D polymeric [Mn(qptc)0.5]n layer. The crystal of 1 crystallizes in orthorhombic, space group Pbca with a = 9.3119(12), b = 20.848(3), c = 26.134(3) A, V= 5073.4(11) A3, Z= 8, C27HIgMnN6O5,Mr=562.42, Dc = 1.473 g/cm3, F(000) = 2304 and μ(MoKa) = 0.571 mm-1. The final R = 0.0468 and wR = 0.1196 for 4429 observed reflections with I 〉 2σ(I) and R = 0.0797 and wR = 0.1383 for all data.

  12. Gudrun Stenglein, Condición femenina y delincuencia: Estudio comparado hispano-alemán y una propuesta sistémica europea, AV Akademikerverlag GmbH & Co. KG, EAE, Saarbrücken, 2012, 252 págs.

    Directory of Open Access Journals (Sweden)

    Manuel J. Peláez

    2013-03-01

    Full Text Available Wenn über Kriminalität gesprochen wird, scheint es sich um ein reines Männerthema zu handeln. Sind die Frauen wirklich weniger straffällig als die Männer? Die Frau als Straftäterin wird in der Literatur vernachlässigt. In der modernen Kriminologie erscheint die Frau fast nur in der Opferrolle. Die angeführte Studie befaßt sich mit den Fragen, die sich aus dieser Problematik ergeben. Die Straffälligkeit der Frauen wird einer multidisziplinären Analyse unterzogen, traditionelle und moderne Erklärungsansätze werden systematisiert und in Verbindung zueinander gebracht. Anhand von Statistiken werden sowohl die Anzahl der Straftäterinnen als auch die Delikte, die scheinbar frauentypisch sind, untersucht und zwischen den Modellen der mediterranen und nordeuropäischen Länder verglichen. Es überrascht, dass es so gut wie keine internationalen oder nationalen Programme zur Verbrechensvorbeugung bezüglich der Frauenkrimialität gibt. Scheint es doch so, dass der Staat als einzige Antwort auf dieses Phänomen die Strafverfolgung kennt (traditionelles Strafrecht. Untersuchungen in Strafanstalten zeigen aber, dass die Frauen in den meisten Fällen aufgrund ihres sozialen Umfelds und ihrer geringeren Chancen auf Ausbildung und Ausübung eines Berufes zur Straftäterin werden. Eine effiziente Kriminalpolitik müsste mit der Ungleichbehandlung der Frauen aufräumen und eine adäquate Sozialisierung für die Frauen schaffen, die oft auf sich gestellt und mit der Versorgung ihrer Familie überfordert sind. Es stellt sich heraus, dass, wenn über ein vereintes Europa gesprochen wird, die Wirklichkeit einer gemeinsamen europäischen Kriminalpolitik noch weit entfernt ist. Außerdem wird die Ernsthaftigkeit dieses Vorhabens bezweifelt, da zuviele Unterschiede, Differenzen und Vorbehalte unter den europäischen Mitgliedsstaaten bestehen. Es handelt sich eher um ein fadenscheiniges Agieren der Politiker.

  13. Dietary exposure to benzoates (E210-E213), parabens (E214-E219), nitrites (E249-E250), nitrates (E251-E252), BHA (E320), BHT (E321) and aspartame (E951) in children less than 3 years old in France.

    Science.gov (United States)

    Mancini, F R; Paul, D; Gauvreau, J; Volatier, J L; Vin, K; Hulin, M

    2015-01-01

    This study aimed to estimate the exposure to seven additives (benzoates, parabens, nitrites, nitrates, BHA, BHT and aspartame) in children aged less than 3 years old in France. A conservative approach, combining individual consumption data with maximum permitted levels, was carried out for all the additives. More refined estimates using occurrence data obtained from products' labels (collected by the French Observatory of Food Quality) were conducted for those additives that exceeded the acceptable daily intake (ADI). Information on additives' occurrence was obtained from the food labels. When the ADI was still exceeded, the exposure estimate was further refined using measured concentration data, if available. When using the maximum permitted level (MPL), the ADI was exceeded for benzoates (1.94 mg kg(-1) bw day(-1)), nitrites (0.09 mg kg(-1) bw day(-1)) and BHA (0.39 mg kg(-1) bw day(-1)) in 25%, 54% and 20% of the entire study population respectively. The main food contributors identified with this approach were current foods as these additives are not authorised in specific infant food: vegetable soups and broths for both benzoates and BHA, delicatessen and meat for nitrites. The exposure estimate was significantly reduced when using occurrence data, but in the upper-bound scenario the ADI was still exceeded significantly by the age group 13-36 months for benzoates (2%) and BHA (1%), and by the age group 7-12 months (16%) and 13-36 months (58%) for nitrites. Measured concentration data were available exclusively for nitrites and the results obtained using these data showed that the nitrites' intake was below the ADI for all the population considered in this study. These results suggest that refinement of exposure, based on the assessment of food levels, is needed to estimate the exposure of children to BHA and benzoates for which the risk of exceeding the ADI cannot be excluded when using occurrence data.

  14. Abu Sada Caroline, ONG palestiniennes et construction étatique. L'expérience de Palestinian Agricultural Relief Committees (PARC dans les Territoires occupés palestiniens, 1983-2005, Institut Français du Proche-Orient, Beyrouth, 2007, 252 p.

    Directory of Open Access Journals (Sweden)

    Vincent Romani

    2009-09-01

    Full Text Available For more than one reason, Caroline Abu Sada's book is seminal. First of all, her work studies the re-shaping of polity inside the Palestinian society since the second Intifada. Based on the authors' PhD dissertation, this book contributes to the limited works on political sociology addressing post-Oslo Palestine (after 2000. This book is also promising in terms of methodology, claiming to conduct a ''bottom-up'' approach looking at a society still over-analyzed in terms of polemology, elites...

  15. 78 FR 16443 - Energy Efficiency Program for Consumer Products: Energy Conservation Standards for Ceiling Fans...

    Science.gov (United States)

    2013-03-15

    ... to the docket Web page can be found at: www.regulations.gov/#!docketDetail ;dct=FR%252BPR%252BN%252BO... light kits in the CFR at 10 CFR 430.32(s). 70 FR 60407, 60413. An additional final rule technical... sockets other than medium-screw base or pin-based fluorescent lamps in the CFR. 72 FR 1270. In a...

  16. TOWARD AN IMPROVED UNDERSTANDING OF STRUCTURE AND MAGNETISM IN NEPTUNIUM AND PLUTONIUM PHOSPHONATES AND SULFONATES

    Energy Technology Data Exchange (ETDEWEB)

    Albrecht-Schmitt, Thomas

    2012-03-01

    This grant supported the exploratory synthesis of new actinide materials with all of the actinides from thorium to californium with the exceptions of protactinium and berkelium. We developed detailed structure-property relationships that allowed for the identification of novel materials with selective ion-exchange, selective oxidation, and long-range magnetic ordering. We found novel bonding motifs and identified periodic trends across the actinide series. We identified structural building units that would lead to desired structural features and novel topologies. We also characterized many different spectroscopic trends across the actinide series. The grant support the preparation of approximately 1200 new compounds all of which were structurally characterized.

  17. Detection of rare earth elements in Powder River Basin sub-bituminous coal ash using laser-induced breakdown spectroscopy (LIBS)

    Energy Technology Data Exchange (ETDEWEB)

    Tran, Phuoc [National Energy Technology Lab. (NETL), Pittsburgh, PA, (United State; Mcintyre, Dustin [National Energy Technology Lab. (NETL), Pittsburgh, PA, (United State

    2015-10-01

    We reported our preliminary results on the use of laser-induced breakdown spectroscopy to analyze the rare earth elements contained in ash samples from Powder River Basin sub-bituminous coal (PRB-coal). We have identified many elements in the lanthanide series (cerium, europium, holmium, lanthanum, lutetium, praseodymium, promethium, samarium, terbium, ytterbium) and some elements in the actinide series (actinium, thorium, uranium, plutonium, berkelium, californium) in the ash samples. In addition, various metals were also seen to present in the ash samples

  18. Method for measuring multiple scattering corrections between liquid scintillators

    Science.gov (United States)

    Verbeke, J. M.; Glenn, A. M.; Keefer, G. J.; Wurtz, R. E.

    2016-07-01

    A time-of-flight method is proposed to experimentally quantify the fractions of neutrons scattering between scintillators. An array of scintillators is characterized in terms of crosstalk with this method by measuring a californium source, for different neutron energy thresholds. The spectral information recorded by the scintillators can be used to estimate the fractions of neutrons multiple scattering. With the help of a correction to Feynman's point model theory to account for multiple scattering, these fractions can in turn improve the mass reconstruction of fissile materials under investigation.

  19. PROCEEDINGS OF THE SYMPOSIUM COMMEMORATING THE 25th ANNIVERSARY OF ELEMENTS 97 and 98 HELD ON JAN. 20, 1975

    Energy Technology Data Exchange (ETDEWEB)

    Seaborg, Glenn T.; Street Jr., Kenneth; Thompson, Stanley G.; Ghiorso, Albert

    1976-07-01

    This volume includes the talks given on January 20, 1975, at a symposium in Berkeley on the occasion of the celebration of the 25th anniversary of the discovery of berkelium and californium. Talks were given at this symposium by the four people involved in the discovery of these elements and by a number of people who have made significant contributions in the intervening years to the investigation of their nuclear and chemical properties. The papers are being published here, without editing, in the form in which they were submitted by the authors in the months following the anniversary symposium, and they reflect rather faithfully the remarks made on that occasion.

  20. 78 FR 76067 - Defense Federal Acquisition Regulation Supplement: Item Unique Identifier Update (DFARS Case 2011...

    Science.gov (United States)

    2013-12-16

    ... of paper material inspection and receiving reports. Response: The purpose of the 252.211-7003(d) and... International Standards Organization (ISO)/International Electrotechnical Commission (IEC) 16022. * * * * *...

  1. 78 FR 37980 - Defense Federal Acquisition Regulation Supplement: Solicitation Provisions and Contract Clauses...

    Science.gov (United States)

    2013-06-25

    ... has retained in the final rule the language at 252.244-7000(b), which is the same as FAR 52.244-6(c)(2... Comments Several respondents had editorial comments as to the language within the rule. Comment: One... the clause at 252.225-7008, Restriction on Acquisition of Specialty Metals, as prescribed in...

  2. 76 FR 33166 - Defense Federal Acquisition Regulation Supplement (DFARS); Warranty Tracking of Serialized Items...

    Science.gov (United States)

    2011-06-08

    ...-alone note under the table. 252.211-7003(a), Item Identification and Valuation--the definition of... benefits (including potential economic, environmental, public health and safety effects, distributive.... * * * * * (5)(i) In addition to 252.211-7003, Item Identification and Valuation, which is prescribed in...

  3. Musik som analogi og metafor

    DEFF Research Database (Denmark)

    2014-01-01

    Indeholder underkapitlerne: 2.5.1 Musik som analogi 2.5.2 Musik som metafor 2.5.3 Musikkens psykologiske funktioner - en taxonomi og metaforisk lytning til fire baroksatser......Indeholder underkapitlerne: 2.5.1 Musik som analogi 2.5.2 Musik som metafor 2.5.3 Musikkens psykologiske funktioner - en taxonomi og metaforisk lytning til fire baroksatser...

  4. 75 FR 32635 - Defense Acquisition Regulations System; Defense Federal Acquisition Regulation Supplement...

    Science.gov (United States)

    2010-06-08

    ... Regulation Supplement; Balance of Payments Program Exemption for Commercial Information Technology... implement in the clauses at 252.225-7044, Balance of Payments Program--Construction Material, and 252.225-7045, Balance of Payments Program--Construction Material under Trade Agreements, the exemption from...

  5. 40 CFR 52.1920 - Identification of plan.

    Science.gov (United States)

    2010-07-01

    .../2001 12/29/2008, 73 FR 79400 NOT in SIP: in the first sentence, the phrase “under 252:100-11” and the.../1999 12/29/2008, 73 FR 79400 252:100-39-44 Manufacture of pneumatic rubber tires 6/11/1999...

  6. Gclust Server: 66666 [Gclust Server

    Lifescience Database Archive (English)

    Full Text Available 66666 TET_252.m00029 Cluster Sequences - 2114 Kinesin motor domain containing prote...in chr_0_8254447_252; no annotation 1 1.00e+00 0.0 11.11 0.0 0.0 0.0 0.0 Show 66666 Cluster ID 66666 Sequenc

  7. NCBI nr-aa BLAST: CBRC-CBRE-01-0523 [SEVENS

    Lifescience Database Archive (English)

    Full Text Available CBRC-CBRE-01-0523 ref|YP_040542.1| hypothetical protein SAR1129 [Staphylococcus aureus subsp. aureus... MRSA252] emb|CAG40132.1| putative membrane protein [Staphylococcus aureus subsp. aureus MRSA252] YP_040542.1 8e-04 25% ...

  8. 77 FR 19128 - Defense Federal Acquisition Regulation Supplement: Separation of Combined Provisions and Clauses...

    Science.gov (United States)

    2012-03-30

    ... grammatical changes to paragraph (a) of 252.229-7005, Tax Exemptions (Spain). III. Executive Orders 12866 and... proposed rule in the Federal Register at 76 FR 71922 on November 21, 2011, to separate provisions and... (Spain)... 252.229-7013, Tax Exemptions (Spain)--Representation. Conforming changes are also required...

  9. Occupational Survey Report. Missile Systems Maintenance AFSC 411XOA

    Science.gov (United States)

    1992-10-01

    TASKS PERFORMING E252 ISSUE JOB CONTROL NUMBERS 100 E220 COMPLETE AFTO FORMS 349-3 (MAINTENANCE DATA COLLECTION RECORD (AUTOMATED)) 87 E209 COMPLETE AF...MONTHS PERCENTAGE OF TOTAL SAMPLE: 4% PERCENT MEMBERS TASKS PERFORMING E252 ISSUE JOB CONTROL NUMBERS 100 B38 ADJUST DAILY MAINTENANCE PLANS TO MEET

  10. Disaster Preparedness Utilization Field/Disaster Preparedness Career Ladder, AFSCs 05XX/242X0

    Science.gov (United States)

    1988-11-01

    STG219, N=12) PERCENT MEMBERS TASKS PERFORMING E285 TYPE CORRESPONDENCE, SUCH AS REPORTS OR RECORDS 100 E252 MAINTAIN DISASTER PREPAREDNESS (DP...TECHNICAL ORDER FILES 67 E252 MAINTAIN DISASTER PREPAREDNESS (DP) OFFICE ADMINISTRATIVE FILES 56 A9 TABLE AlO REPRESENTATIVE TASKS PLRFORMED BY CONTROL

  11. Procedimento de fiscalização : pneus reformados

    OpenAIRE

    2010-01-01

    Estabelece os critérios e padroniza o procedimento para fiscalização de pneus reformados quanto ao cumprimento da Portaria Inmetro nº Portarias Inmetro 227 e 252/2006. Portarias INMETRO 227 e 252/2006

  12. EST Table: BP123184 [KAIKOcDNA[Archive

    Lifescience Database Archive (English)

    Full Text Available BP123184 epV30682 10/09/28 34 %/252 aa ref|XP_002097124.1| fau [Drosophila yakuba] gb|EDW96836.1| fau... [Drosophila yakuba] 10/08/29 34 %/252 aa FBpp0269678|Dyakfau-PA 10/08/28 n.h 10/09/10 low

  13. Dicty_cDB: AFO251 [Dicty_cDB

    Lifescience Database Archive (English)

    Full Text Available ) Pyrocystis lunula actin mRNA, comp... 252 3e-66 AY221950_1( AY221950 |pid:none) Pseudo-nitzschia multise...ries actin... 252 3e-66 protein update 2009. 4.26 PSORT psg: 0.84 gvh: 0.59 alm: 0.

  14. 48 CFR 52.212-5 - Contract Terms and Conditions Required To Implement Statutes or Executive Orders-Commercial Items.

    Science.gov (United States)

    2010-10-01

    ...). ___(2) 52.203-13, Contractor Code of Business Ethics and Conduct (APR 2010)(Pub. L. 110-252, Title VI... required by the clause— (i) 52.203-13, Contractor Code of Business Ethics and Conduct (APR 2010) (Pub. L... Business Ethics and Conduct (APR 2010) (Pub. L. 110-252, Title VI, Chapter 1 (41 U.S.C. 251 note)). (B)...

  15. 48 CFR 235.072 - Additional contract clauses.

    Science.gov (United States)

    2010-10-01

    ... involving research on live vertebrate animals. (b) Use the clause at 252.235-7003, Frequency Authorization... 252.235-7011, Final Scientific or Technical Report, in solicitations and contracts for research and... SYSTEM, DEPARTMENT OF DEFENSE SPECIAL CATEGORIES OF CONTRACTING RESEARCH AND DEVELOPMENT CONTRACTING...

  16. Lack of Training and a Self-Service Environment Leaves Staff and Users Uncertain About Health Information in a Public Library Setting. A Review of: Harris, R., Henwood, F., Marshall, A., & Burdett, S. (2010. “I'm not sure if that's what their job is." Consumer health information and emerging "healthwork" roles in the public library. Reference and User Services Quarterly, 49(3, 239-252.

    Directory of Open Access Journals (Sweden)

    Kate Kelly

    2012-03-01

    Full Text Available Objective – To explore the role and expectations of patrons and staff about the role of a public library in enabling citizens’ “health information work.” This involves helping citizens take responsibility for their own health care by finding and using health information.Design – Case study.Setting – A single, UK public library with a self-service delivery model based in a city centre in the spring of 2006. Self-service also applies to reference services and is designed to “empower users to locate and use information on their own.”Subjects – 202 library visitors who came to the library specifically to find health information completed a questionnaire, 15 of these visitors were later interviewed; 19 library staff (10 librarians, 6 library officers and 3 senior managers.Methods – Mixed quantitative and qualitative methods. A print questionnaire was administered to adult library users (age 18 and over. Semi-structured interviews were conducted with fifteen randomly selected library users who completed the questionnaire, sixteen library staff who worked directly with library users, and with three librarians in senior management positions in the library. Descriptive statistics were calculated from the questionnaire, recorded interviews were transcribed, and the text analyzed to identify recurring themes.Main Results – While all respondents came to the library to seek health information results from the questionnaire found that half (50% of respondents came to the library to look for information on a specific health problem; 37% of respondents had tried finding information elsewhere before coming to the library; 40% usually searched the Internet when they needed health information or advice although only 32% reported trusting the Internet somewhat or completely; 67% intended to borrow books; only 4% indicated that they had planned to ask library staff for help; and 59% reported finding what they were looking for by themselves.Results from the interviews found users, front line staff, and managers in general agreement about the role of the library as a starting point for health information, and that the library was a neutral and non-threatening environment. There was also agreement among the three groups interviewed that the public library fills a gap when health care providers, particularly doctors, are unable to meet the information needs of some of their patients. Library staff were concerned about interpreting information as well as the impact of a self-service philosophy on the quality and length of interactions with users, and seemed unclear about their role in relation to health information provision. Library staff had no training in supporting health information and limited or no knowledge of authoritative online health resources and how to use them, and their approach to Internet searching was similar to users. This lack of training and expertise appeared obvious to library users. Users did not identify interpretation of information by librarians as an issue but did reference the impact of self-service and the Internet on the role and morale of the library staff. Neither library users nor library staff identified librarians as a resource to be used when seeking health information. The value of the library for users was the book collection and they saw the library as second only to physicians as a source of trustworthy information.Conclusion – Uncertainty about the role of librarians in health information provision was evinced by both librarians and library users. Both groups were also uncertain about the relationship between self-service and technology, and the way in which librarians and their work are almost invisible. Health policies emphasize personal responsibility for health yet individuals are not enabled to find answers to their questions. The absence of health knowledgeable front line staff in public libraries is “worrisome.” The obvious trust users have in the library suggests that efforts to develop consumer health information in these settings continue to be a worthwhile response to the “pressures on citizens to take responsibility for their health”.

  17. Wisconsin statutes regarding HIV testing in primary care: frequent questions and answers.

    Science.gov (United States)

    Vergeront, J M; Reiser, W J; Druckenmiller, J K; Krchnavek, K A; Davis, J P

    1998-12-01

    The authors review Wisconsin statutes related to human immunodeficiency virus (HIV) testing in primary care, including the areas of written informed consent, documentation of consent, testing without consent, testing of minors, disclosure of test results without the consent of the test subject, reporting requirements, discrimination, access by insurance companies and third-party payors to HIV test results, and civil liabilities and criminal penalties associated with violation of HIV-related state statutes. During the course of the HIV epidemic in Wisconsin, many individuals (service providers, legislators, consumers and advocates) supported the enactment of HIV-related legislation. Today, Wisconsin has some of the nation's most comprehensive HIV legislation. These laws have set a legal framework that balances the rights of individuals with protection of public's health. The relatively low seroprevalence of HIV infection in Wisconsin can be attributed, in part, to the state's HIV-related legislation. While Wisconsin HIV legislation is broadly focused, much of it is concerned with HIV testing. This article examines common questions as they pertain to HIV testing in primary care and to the following areas addressed by state statutes: counseling and referral for health and support services [Wisconsin statute s. 252 14(3)] informed consent for testing or disclosure [Wisconsin statute s. 252.15(2)] written consent to disclose [Wisconsin statute s. 252.15(3) & (4)] testing without consent of the test subject [Wisconsin statute s. 252.15(2)] confidentiality of an HIV test [Wisconsin statute s. 252.15(5)] reporting of positive test results [Wisconsin statute s. 252.15(7)] discrimination [Wisconsin statute s. 252.14(2)] civil and criminal liabilities [Wisconsin statute s. 252.14(4); 252.15(8) & (9)].

  18. Public Health (AFSC 43HX)

    Science.gov (United States)

    1994-06-01

    D238 Write training reports 1.41 3 D234 Score tests .65 16 0014 3. Occupational Health E252 Maintain Environmental Protection Agency (EPA) reference...hazard reports 2.22 9 E252 Maintain Environmental Protection Agency (EPA) reference files 1.59 6 0024 3j. Industrial Case files B B 131 Update shop...0048 3bb. Indoor Air Quality B E252 Maintain Environmental Protection Agency (EPA) reference files 1.59 6 0050 4a. Food Inspection Program B E242

  19. Triton and alpha-particle contribution from LiF converter for neutron dosimeter

    CERN Document Server

    Camacho, M E; Balcazar, M

    1999-01-01

    A personnel neutron dosimeter prototype based on chemical and electrochemical etched CR-39 detector, combined with LiF converter, has been calibrated using an ICRP-like phantom, under a heavy-water moderated Californium source neutron spectra; A conversion factor of 1.052+-126 spots cm sup - sup 2 mSv sup - sup 1 was obtained. The sealing properties of the detector holder showed a ten-fold reduction in radon background when it was tested in a high radon atmosphere. A convenient mechanical shock resistance was achieved in LiF converters by sintering to 11 tons pressure LiF powder at 650 deg. C, during one hour.

  20. First results from the CARIBU facility: mass measurements on the r-process path.

    Science.gov (United States)

    Van Schelt, J; Lascar, D; Savard, G; Clark, J A; Bertone, P F; Caldwell, S; Chaudhuri, A; Levand, A F; Li, G; Morgan, G E; Orford, R; Segel, R E; Sharma, K S; Sternberg, M G

    2013-08-09

    The Canadian Penning Trap mass spectrometer has made mass measurements of 33 neutron-rich nuclides provided by the new Californium Rare Isotope Breeder Upgrade facility at Argonne National Laboratory. The studied region includes the 132Sn double shell closure and ranges in Z from In to Cs, with Sn isotopes measured out to A=135, and the typical measurement precision is at the 100 ppb level or better. The region encompasses a possible major waiting point of the astrophysical r process, and the impact of the masses on the r process is shown through a series of simulations. These first-ever simulations with direct mass information on this waiting point show significant increases in waiting time at Sn and Sb in comparison with commonly used mass models, demonstrating the inadequacy of existing models for accurate r-process calculations.

  1. Nuclear fission and the transuranium elements

    Energy Technology Data Exchange (ETDEWEB)

    Seaborg, G.T.

    1989-02-01

    Many of the transuranium elements are produced and isolated in large quantities through the use of neutrons furnished by nuclear fission reactions: plutonium (atomic number 94) in ton quantities; neptunium (93), americium (95), and curium (96) in kilogram quantities; berkelium (97) in 100 milligram quantities; californium (98) in gram quantities; and einsteinium (99) in milligram quantities. Transuranium isotopes have found many practical applications---as nuclear fuel for the large-scale generation of electricity, as compact, long-lived power sources for use in space exploration, as means for diagnosis and treatment in the medical area, and as tools in numerous industrial processes. Of particular interest is the unusual chemistry and impact of these heaviest elements on the periodic table. This account will feature these aspects. 9 refs., 5 figs.

  2. Production of highly pure einsteinium and fermium preparations

    Energy Technology Data Exchange (ETDEWEB)

    Andreev, O.I.; Tarasov, V.A.; Zotov, E.A.; Baranov, A.Yu. [Federal State Unitary Enterprise ' ' State Scientific Center of Russian Federation Research Institute of Atomic Reactors' ' (Russian Federation)

    2004-07-01

    Highly pure einsteinium and fermium preparations are in increased demand due to the progress of the following fields of modern sciences: Fundamental and applied nuclear physics. Heavy actinides are necessary for detailed study of structure and decay of a nucleus, as well as initial material both for nuclear synthesis of new superheavy elements and for manufacturing radioactive radiation sources. Fundamental and applied radiochemistry. Einsteinium and fermium preparations are required to investigate chemical properties of these hard-to-obtain elements and to improve technology of their recovery and purification. Nuclear medicine. Biologically active compounds labeled with alpha- emitting einsteinium and fermium may be applied in prospect for a radioimmunotherapy of oncological diseases. The principal method of einsteinium and fermium production is irradiation of curium or californium isotopes in a high-flux nuclear reactor. Large-scale production of transplutonium elements at RIAR enables also to produce regularly significant quantities of einsteinium and fermium. (orig.)

  3. Beta-delayed neutron spectroscopy using ion traps

    Science.gov (United States)

    Wang, Barbara; Czeszumska, A.; Siegl, K.; Caldwell, S.; Aprahamian, A.; Burkey, M.; Clark, J.; Levand, A.; Marley, S.; Morgan, G.; Norman, E.; Nystrom, A.; Orford, R.; Padgett, S.; Perez Galvan, A.; Savard, G.; Scielzo, N.; Sharma, K.; Strauss, S.

    2017-01-01

    Trapped radioactive ions suspended in vacuum allow for a new way to perform beta-delayed neutron spectroscopy. Decay branching ratios and energy spectra of the emitted neutrons are inferred from a measurement of the nuclear recoil, thereby circumventing the many limitations associated with direct neutron detection. Beta-delayed neutron measurements were carried out for 137-138,140I, 134-136Sb, and 144-145Cs at the Californium Rare Isotope Breeder Upgrade (CARIBU) facility at Argonne National Laboratory. The data collected are needed in many fields of basic and applied science such as nuclear energy, nuclear astrophysics, and stockpile stewardship. Results for the isotopes 135-136Sb and 140I will be presented. Supported by NSF under PHY-1419765, and U.S. DOE under NEUP 13-5485, DE-AC02-06CH11357 (ANL), DE-AC52-07NA27344 (LLNL), and DE-NA0000979 (NNSA).

  4. TRIGA-TRAP: A penning trap mass spectrometer at the research reactor TRIGA Mainz

    Energy Technology Data Exchange (ETDEWEB)

    Smorra, Christian [Physikalisches Institut, Universitaet Heidelberg (Germany); Institut fuer Kernchemie, Universitaet Mainz (Germany); Blaum, Klaus [Physikalisches Institut, Universitaet Heidelberg (Germany); Max-Planck-Institut fuer Kernphysik, Heidelberg (Germany); Block, Michael; Herfurth, Frank [GSI, Helmholtzzentrum fuer Schwerionenforschung GmbH, Darmstadt (Germany); Eberhardt, Klaus [Institut fuer Kernchemie, Universitaet Mainz (Germany); Eibach, Martin; Ketelaer, Jens; Ketter, Jochen; Knuth, Konstantin; Repp, Julia [Institut fuer Physik, Universitaet Mainz (Germany); Nagy, Szilard [Max-Planck-Institut fuer Kernphysik, Heidelberg (Germany)

    2009-07-01

    Nuclear masses represent the binding energies and, therefore, the sum of all interactions in the nucleus. They provide an important input parameter to nuclear structure models. Presently, a tremendous interest in masses of very exotic neutron-rich nuclides exists to support theoretical models for the nucleosynthesis via the rapid neutron capture process. The research reactor TRIGA Mainz provides access to a large variety of neutron-rich nuclides produced by thermal-neutron induced fission of an actinide target. The double-Penning trap mass spectrometer TRIGA-TRAP will perform high-precision mass measurements in this region of the nuclear chart as well as on actinides from uranium to californium. It also serves as a test facility for the development of new techniques that will be implemented in future facilities like MATS at FAIR (GSI, Darmstadt). The layout of TRIGA-TRAP as well as recent mass measurements are presented.

  5. Populations of selected microbial and fungal species growing on the surface of rape seeds following treatment with desiccants or plant growth regulators.

    Science.gov (United States)

    Frac, Magdalena; Jezierska-Tys, Stefania; Tys, Jerzy

    2010-01-01

    The aim of this study was to determine the effects of desiccants and plant growth regulators on selected microbial species affecting rape seeds, with special emphasis on the growth of fungi and identification of the genus and species composition. The experimental material in the study was seeds of winter rape cv. Californium that were collected from the field during combine harvest. The chemical agents applied, both desiccants and growth regulators, generally decreased the populations of bacteria occurring on the surface of rape seeds. The responses of fungi depended upon the type of agent applied and were manifested as either stimulation or inhibition of the growth of the fungal species. The fungi isolated from the surface of rape seeds were characteristic of those found in the field environment (Cladosporium and Penicillium) and typical for those present on the surface of rape seeds (Alternaria).

  6. Measurements of the neutron capture cross sections and incineration potentials of minor-actinides in high thermal neutron fluxes: Impact on the transmutation of nuclear wastes; Mesures des sections efficaces de capture et potentiels d'incineration des actinides mineurs dans les hauts flux de neutrons: Impact sur la transmutation des dechets

    Energy Technology Data Exchange (ETDEWEB)

    Bringer, O

    2007-10-15

    This thesis comes within the framework of minor-actinide nuclear transmutation studies. First of all, we have evaluated the impact of minor actinide nuclear data uncertainties within the cases of {sup 241}Am and {sup 237}Np incineration in three different reactor spectra: EFR (fast), GT-MHR (epithermal) and HI-HWR (thermal). The nuclear parameters which give the highest uncertainties were thus highlighted. As a result of fact, we have tried to reduce data uncertainties, in the thermal energy region, for one part of them through experimental campaigns in the moderated high intensity neutron fluxes of ILL reactor (Grenoble). These measurements were focused onto the incineration and transmutation of the americium-241, the curium-244 and the californium-249 isotopes. Finally, the values of 12 different cross sections and the {sup 241}Am isomeric branching ratio were precisely measured at thermal energy point. (author)

  7. 77 FR 20688 - 29th Meeting: RTCA Special Committee 206, Aeronautical Information and Meteorological Data Link...

    Science.gov (United States)

    2012-04-05

    ... Status. Discuss previously proposed TOR changes and DO-252 Revision. Discuss TOR changes for the June PMC... release to the PMC. Agree upon TOR changes for June PMC meeting. Other business. Adjourn--1...

  8. 76 FR 58138 - Defense Federal Acquisition Regulation Supplement (DFARS); Alternative Line Item Structure (DFARS...

    Science.gov (United States)

    2011-09-20

    ... regulatory approaches that maximize net benefits (including potential economic, environmental, public health...). (C) Use the clause at 252.211-7003, Item Identification and Valuation, as prescribed in 211.274-4....

  9. 76 FR 21847 - Defense Federal Acquisition Regulation Supplement (DFARS), Alternative Line-Item Structure (DFARS...

    Science.gov (United States)

    2011-04-19

    ... economic, environmental, public health and safety effects, distributive impacts, and equity). Executive... Identification and Valuation, as prescribed in 211.274-4. (D) Use the clause at 252.211-7006, Radio...

  10. 48 CFR 247.572 - Policy.

    Science.gov (United States)

    2010-10-01

    ...) DoD contractors must transport supplies, as defined in the clause at 252.247-7023, Transportation of... Army determines that the proposed freight charges are excessive or unreasonable in accordance with...

  11. HOME Rent Limits

    Data.gov (United States)

    Department of Housing and Urban Development — In accordance with 24 CFR Part 92.252, HUD provides maximum HOME rent limits. The maximum HOME rents are the lesser of: The fair market rent for existing housing for...

  12. Population genetics provides an efficient tool to quantify fragmentation impact in forest ecosystems

    Directory of Open Access Journals (Sweden)

    2005-01-01

    Full Text Available A method in population genetics (Dutech et al., Am. J. Bot. 92 (2, 252-261, February 2005 is described and discussed as an interesting tool for investigating the effects of fragmentation in forest ecosystems.

  13. Gclust Server: 34444 [Gclust Server

    Lifescience Database Archive (English)

    Full Text Available CTED: similar to Amphiregulin precursor (AR) (Colorectum cell-derived growth factor) (CRDGF) ; no annotation...e length 252 Representative annotation XP_001125684.1 PREDICTED: similar to Amphiregulin precursor (AR) (Color

  14. 76 FR 33359 - Notice of Reopening the Call for Nominations for Certain Resource Advisory Councils

    Science.gov (United States)

    2011-06-08

    ... Jeff Fontana, Eagle Lake Field Office, BLM, 2950 Riverside Drive, Susanville, California 96130, (530) 252-5332. Northwestern California RAC Jeff Fontana, Eagle Lake Field Office, BLM, 2950 Riverside...

  15. 48 CFR 229.402-70 - Additional clauses.

    Science.gov (United States)

    2010-10-01

    ... Germany, use the clause with its Alternate I. (b) Use the clause at 252.229-7002, Customs Exemptions (Germany), in solicitations and contracts requiring the import of U.S. manufactured products into...

  16. Genetic and bibliographic information: PLEKHG4 [GenLibi

    Lifescience Database Archive (English)

    Full Text Available > Cerebellar Ataxia (C10.228.140.252.190) Nervous System Diseases (C10) > Neurolog...0.597.350.090.500) Pathological Conditions, Signs and Symptoms (C23) > Signs and Symptoms (C23.888) > Neurolog

  17. Aerodynamic Performance and Particle Image Velocimetery of Piezo Actuated Biomimetic Manduca Sexta Engineered Wings Towards the Design and Application of a Flapping Wing Flight Vehicle

    Science.gov (United States)

    2013-12-01

    2.5.1 Powerplant & Drive Train . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 2.5.2 The AFIT FWMAV Design...51 Ftrans force due to translation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 f wave ...36 ϕ signal wave phase shift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186 ψf feather angle

  18. 77 FR 43905 - Endangered and Threatened Wildlife and Plants; Endangered Status for the Diamond Darter and...

    Science.gov (United States)

    2012-07-26

    ... Ohio and the Ohio River (Mishne 2008, p. 1; Trautman 1981, p. 646). Pearson and Krumholtz (1984, p. 252... (Fulk et al. 2003, p. iv). In addition, that study noted a significant correlation between the number...

  19. Herstellung von Bio-Fleisch- und Wurstwaren ohne Einsatz von Pökelstoffen

    OpenAIRE

    2008-01-01

    Bei der ökologischen Herstellung von Fleisch- und Wurstwaren werden vielfach auf die in der konventionellen Wurstherstellung verwendeten Konservierungsstoffe E 250 (Natriumnitrit) bzw. E 252 (Kaliumnitrat) verzichtet oder reduzierte Zugabemengen der Zusatzstoffe verwendet.

  20. Data of evolutionary structure change: 1MBQA-2TGDA [Confc[Archive

    Lifescience Database Archive (English)

    Full Text Available 1MBQA-2TGDA 1MBQ 2TGD A A IVGGYECKAYSQPHQVSLNSGYHFCGGSLVNENWVVSAA...CNNSYPGMITNAMFCAGYLEGGKDSCQGDSGGPVVCNGELQGVVSWGYGCAEPGNPGVYAKVCIFNDWLTSTMA-- -VGGYTCGANTVPYQVSL...VASISLPTSCASAGTQCLISGWGNTKSSGTSYPDVLKCLKAPILSDSSCKSAYPGQITSNMFCAGYLEGGKDSCQGDSGGPVVCSGKLQGIVSWGSGCAQKNKPGVYT...P CA 252 LYS CA 335 ASN CA 345 2TGD... A 2TGDA NTK

  1. 77 FR 31640 - Notice of Public Meeting: Northwest California Resource Advisory Council

    Science.gov (United States)

    2012-05-29

    ..., (530) 224-2160; or Joseph J. Fontana, public affairs officer, (530) 252-5332. SUPPLEMENTARY INFORMATION... accommodations, should contact the BLM as provided above. Dated: May 14, 2012. Joseph J. Fontana, Public...

  2. 76 FR 81962 - Notice of Public Meeting: Joint Session of Northeast California Resource Advisory Council and...

    Science.gov (United States)

    2011-12-29

    ... Joseph J. Fontana, BLM public affairs officer, (530) 252-5332. SUPPLEMENTARY INFORMATION: These councils... accommodations, should contact the BLM as provided above. Dated: December 9, 2011. Joseph J. Fontana,...

  3. 75 FR 11555 - Notice of Public Meeting: Northeast California Resource Advisory Council and Subcommittee

    Science.gov (United States)

    2010-03-11

    ... Affairs Officer Joseph J. Fontana, (530) 252-5332. SUPPLEMENTARY INFORMATION: The 15-member council... reasonable accommodations, should contact the BLM as provided above. Dated: February 26, 2010. Joseph J. Fontana, Public Affairs Officer. BILLING CODE 4310-40-P...

  4. 78 FR 4871 - Notice of Public Meeting: Northwest California Resource Advisory Council

    Science.gov (United States)

    2013-01-23

    ... Joseph J. Fontana, public affairs officer, (530) 252-5332. SUPPLEMENTARY INFORMATION: The 12-member... above. Dated: January 15, 2013. Joseph J. Fontana, Public Affairs Officer. BILLING CODE 4310-40-P...

  5. 75 FR 3246 - Notice of Public Meeting: Northeast California Resource Advisory Council

    Science.gov (United States)

    2010-01-20

    ... California District manager, (530) 221-1743; or BLM Public Affairs Officer Joseph J. Fontana, (530) 252-5332... accommodations, should contact the BLM as provided above. Dated: January 12, 2010. Joseph J. Fontana,...

  6. 75 FR 27579 - Notice of Public Meeting: Northwest California Resource Advisory Council

    Science.gov (United States)

    2010-05-17

    ...-1743; or BLM Public Affairs Officer Joseph J. Fontana, (530) 252-5332. SUPPLEMENTARY INFORMATION: The... as provided above. Dated: May 6, 2010. Joseph J. Fontana, Public Affairs Officer. BILLING CODE...

  7. Designing Learning Networks for Lifelong Learners

    NARCIS (Netherlands)

    Koper, Rob

    2005-01-01

    Koper, R. (2005). Designing Learning Networks for Lifelong Learners. In: Koper, R. & Tattersall, C., Learning Design: A Handbook on Modelling and Delivering Networked Education and Training (pp. 239-252). Berlin-Heidelberg: Springer Verlag.

  8. 76 FR 3536 - Defense Federal Acquisition Regulation Supplement; Technical Amendments

    Science.gov (United States)

    2011-01-20

    .... 252.212-7001. Corrects a clause number in (b)(11)(iii) and reverses the order of two clauses in... Defense Logistics Agency--the Office of Counsel; (5) For the National Security Agency--the General...

  9. Lactobacilli vs antibiotics to prevent urinary tract infections: A randomized, double-blind, noninferiority trial in postmenopausal women

    NARCIS (Netherlands)

    M.A.J. Beerepoot (Mariëlle); G. ter Riet; S. Nys (Sita); W. van der Wal (Willem); C.A. de Borgie (Corianne); T.M. de Reijke (Theo); J.M. Prins (Jan); J. Koeijers (Jeanne); A. Verbon (Annelies); E.E. Stobberingh (Ellen); S.E. Geerlings (Suzanne)

    2012-01-01

    textabstractBackground: Growing antibiotic resistance warrants studying nonantibiotic prophylaxis for recurrent urinary tract infections (UTIs). Use of lactobacilli appears to be promising. Methods: Between January 2005 and August 2007, we randomized 252 postmenopausal women with recurrent UTIs taki

  10. 76 FR 75523 - Vessel Monitoring Systems; Approved Mobile Transmitting Units and Communications Service...

    Science.gov (United States)

    2011-12-02

    ... Kelly Spalding, VMS Management Analyst, phone (301) 427-2300; fax (301) 427-0049. For questions... with MDA version 2.52, April 27, 2007, Comrod AV-57, May 2005 VHF antenna, SA-700 GPS antenna,...

  11. Data of evolutionary structure change: 1ADIB-1DJ3A [Confc[Archive

    Lifescience Database Archive (English)

    Full Text Available 1ADIB-1DJ3A 1ADI 1DJ3 B A -------GNNVVVLGTQWGDEGKGKIVDLLTERAKYVVR...KVARRGLRVGDLFDKETFAEKLKEVMEYHNFQLVNYYKAEAVDYQKVLDDTMAVADILTSMVVDVSDLLDQARQRGDFVMFEGAQGTLLDIDHGTYPYVTSSNTTAGG... 0 1ADI B 1ADIB TLVIN-GEKTVTYR CA 252 1ADI B 1ADI

  12. Most Recent Sampling Results for Annex III Building

    Science.gov (United States)

    Contains email from Scott Miller, US EPA to Scott Kramer. Subject: Most Recent Sampling Results for Annex III Building. (2:52 PM) and Gore(TM) Surveys Analytical Results U.S. Geological Survey, Montgomery, AL.

  13. Review: Franklin Obeng-Odoom, Oiling the Urban Economy: Land, Labour, Capital, and the State in Sekondi-Takoradi, Ghana (2014

    Directory of Open Access Journals (Sweden)

    Nelson Oppong

    2015-01-01

    Full Text Available Review of the monograph: Franklin Obeng-Odoom, Oiling the Urban Economy: Land, Labour, Capital, and the State in Sekondi-Takoradi, Ghana, New York: Routledge, 2014, ISBN 9780415744096, 252 pages

  14. Dicty_cDB: Contig-U13016-1 [Dicty_cDB

    Lifescience Database Archive (English)

    Full Text Available tntgntg 72 Query: 73 atttngatccnaaaccnttcntttgtaaaactgcngctgntgtttcngttggngttgctg 132 ||||||||||||||||||||||...|||||||||||||||||||||||||||||||||||||| Sbjct: 73 atttngatccnaaaccnttcntttgtaaaactgcngctgntgtttcngttggngttgct...gtntttatttttgnnggnaanaaag 192 Query: 193 gttatgacttntggaaancnagtcaaggngntncnatggccccntcnaatgccnatcccc 252 ||...|||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Sbjct: 193 gttatgacttntggaaancnagtcaaggngntncnatggccccntcnaatgccna...e-30 Identities = 165/186 (88%) Strand = Plus / Plus Query: 71 tgatttngatccnaaaccnttcntttgtaaaactgcngctgntgt

  15. Workshop on the Road to Room Temperature Superconductivity

    Science.gov (United States)

    1993-01-14

    Road to Room Temperature Superconductivity A workshop was held October 19-2 1, 1992, in Bodega Bay, California, to discuss possibilities for attaining...Appendix I RTS WORKSHOP PARTICIPANTS BODEGA BAY LODGE OCTOBER 19-21, 1992 Cava, Dr. R. J. AT&T Bell Laboratories Mat’ls Sci & Engr Res Div 1T304 600 Mountain...708-252-3464 1 Attendance inderendently supported Fax:708-252-4993 Appendix 2 - Agenda THE SEARCH FOR ROOM TEMPERATURE SUPERCONDUCTIVITY Bodega Bay

  16. 78 FR 79620 - Defense Federal Acquisition Regulation Supplement; Trade Agreements Thresholds (DFARS Case 2013...

    Science.gov (United States)

    2013-12-31

    ... prescriptions at DFARS 225.1101, 225.7017-3, 225.7503 and in the clauses at 252.225-7017 and 252.225- 7018... place. 0 3. Section 225.7017-3 is amended in paragraphs (b) and (c)(2), by removing ``$202,000'' and... ``$10,335,931'' in its place. 0 c. In paragraph (b)(3) by removing ``$10,074,262'' and adding...

  17. Stores Interface Data Handling Analysis - Phase 2. Volume 2. Appendixes

    Science.gov (United States)

    1975-01-01

    DM-0U6 DM-OU? DM-0U8 DM-OU9 DM-050 DM-O5I DM-O52 DM-053 DM-05U DM~055 DM-O56 (Ai+02- E252 ) - Aircraft bomb rack release logic is not...NO. E252 DEFIN] ’!■.■; Specifies the type of aircraft bomb rack function that is compatible with the equipment circuit. lARACTERISTIC BLOCK

  18. Radio Frequency Emitter Geolocation Using Cubesats

    Science.gov (United States)

    2014-03-27

    35 2.5.1 Cramer Rao Lower Bound . . . . . . . . . . . . . . . . . . . . . . 35 2.5.2 Dilution of Precision ( DOP ...between sr and θ. 2.5.2 Dilution of Precision ( DOP ). An important factor to consider in geolocation accuracy is the geometry between the satellites and the...considered for the algorithms that are investigated in this research. The DOP is related to the CRLB [40]. If the estimator is efficient, then the

  19. Muscling out malaria

    DEFF Research Database (Denmark)

    Hughes, David Peter; Boomsma, Jacobus Jan

    2006-01-01

    of the pathogenic fungi concerned. There is a long history of using Metarhizium and Beauveria in insect biocontrol [6] with ‘Green Muscle', a broad consortium set up to control locusts using Metarhizium, as an excellent example (for more information, see http://www.sciencedirect.com/science?_ob=RedirectURL&_method=externObjLink&_locator=url......&_cdi=6081&_plusSign=%2B&_targetURL=http%253A%252F%252Fwww.lubilosa.org%252F ). Green Muscle developed from the initial conception that spores could be suspended in oil to facilitate germination in arid regions [7] , which made infecting mosquitoes feasible [4] . However, failures in biocontrol have been...... surveying as part of interdisciplinary programs, comparable to expeditions organised by the British Mycological Society ( http://www.sciencedirect.com/science?_ob=RedirectURL&_method=externObjLink&_locator=url&_cdi=6081&_plusSign=%2B&_targetURL=http%253A%252F%252Fwww.britmycolsoc.org.uk%252F [14] ). Finally...

  20. Relative biological effectiveness of fission neutrons for producing micronuclei in the root-tip cells of onion seedlings after irradiation as dry seeds

    Energy Technology Data Exchange (ETDEWEB)

    Zhang, W.; Ishikawa, Masayori; Hoshi, Masaharu [Hiroshima Univ. (Japan). Research Inst. for Radiation Biology and Medicine; Endo, Satoru [Hiroshima Univ., Higashi-Hiroshima (Japan). Graduate School of Engineering; Ikeda, Hideo [Hiroshima Univ., Higashi-Hiroshima (Japan). Faculty of Education

    2002-12-01

    The relative biological effectiveness (RBE) of mixed neutron and gamma-ray radiation emitted at a {sup 252}Cf source at the Research Institute for Radiation Biology and Medicine, Hiroshima University, compared with {sup 60}Co gamma-ray radiation was determined. The tissue-absorbed dose contribution of the accompanying gamma radiation was about 35.7% to the total tissue-absorbed dose from the {sup 252}Cf mixed radiation. The {sup 252}Cf mixed radiation and {sup 60}Co gamma rays produced approximate linear changes in the frequency of micronuclei induced in root-tip cells of Allium cepa L. onion seedlings after irradiation as dry dormant seeds with varying absorbed doses in onion seeds. Therefore, the RBE for radiation-induced micronuclei was calculated as the ratio of the slopes for the {sup 252}Cf mixed radiation and the {sup 60}Co gamma rays. The deduced RBE value of {sup 252}Cf mixed radiation of {sup 60}Co gamma rays to induce micronuclei in dry dormant onion seed cells was about 90.5{+-}3.6 ({+-}1{sigma}); the RBE of neutrons from the {sup 252}Cf mixed radiation was about 150{+-}6 ({+-}1{sigma}). Furthermore, the sensitivity ratio of the induction rate of micronuclei in dry dormant seeds to that in seedlings by neutrons from {sup 252}Cf mixed radiation was significantly different from that by {sup 60}Co gamma rays. From these results, we concluded that the repair efficiency of DNA damage induced by neutrons may be different from that by gamma rays. (author)

  1. Protein tyrosine kinase inhibitors modify kainic acid-induced epileptiform activity and mossy fiber sprouting but do not protect against limbic cell death

    Directory of Open Access Journals (Sweden)

    C.M. Queiroz

    2008-05-01

    Full Text Available Intrahippocampal administration of kainic acid (KA induces synaptic release of neurotrophins, mainly brain-derived neurotrophic factor, which contributes to the acute neuronal excitation produced by the toxin. Two protein tyrosine kinase inhibitors, herbimycin A and K252a, were administered intracerebroventricularly, in a single dose, to attenuate neurotrophin signaling during the acute effects of KA, and their role in epileptogenesis was evaluated in adult, male Wistar rats weighing 250-300 g. The latency for the first Racine stage V seizure was 90 ± 8 min in saline controls (N = 4 which increased to 369 ± 71 and 322 ± 63 min in animals receiving herbimycin A (1.74 nmol, N = 4 and K252a (10 pmol, N = 4, respectively. Behavioral alterations were accompanied by diminished duration of EEG paroxysms in herbimycin A- and K252a-treated animals. Notwithstanding the reduction in seizure severity, cell death (60-90% of cell loss in KA-treated animals in limbic regions was unchanged by herbimycin A and K252a. However, aberrant mossy fiber sprouting was significantly reduced in the ipsilateral dorsal hippocampus of K252a-treated animals. In this model of temporal lobe epilepsy, both protein kinase inhibitors diminished the acute epileptic activity triggered by KA and the ensuing morphological alterations in the dentate gyrus without diminishing cell loss. Our current data indicating that K252a, but not herbimycin, has an influence over KA-induced mossy fiber sprouting further suggest that protein tyrosine kinase receptors are not the only factors which control this plasticity. Further experiments are necessary to elucidate the exact signaling systems associated with this K252a effect.

  2. Thermionic System Evaluation Test: Ya-21U System Topaz International Program

    Science.gov (United States)

    1996-07-01

    43.7kW P2=52kW P2=43.7kW P2=52kW 0 C P2=52kW P,=49kW PI=34. lkW PI=OkW p,-52kW PR=nkW 500 General Outgassin/ " Repeat General Outgassing 400 A P2- 2kW...P,=43kW P00 =22.4kW 1=16.4W M ~P=~W p~k200 - 2=.. A-•=8, | /• •-- •kW U P,=OkW 100 /p 2 .12. lkW / P2=OkW il P2=11.2kW -j0 r--P2=25kW 0 r ) O -JP 2

  3. Investigations of shield effect and type of soil on landmine detection

    Energy Technology Data Exchange (ETDEWEB)

    Elsheikh, Nassreldeen, E-mail: nassreldeen.elsheikh@yahoo.com [College of Applied and Industrial Science, Department of Physics, University of Juba, Khartoum, P.O. Box 12327/1 (Sudan); Habbani, Farouk [Faculty of Science, Physics Department, University of Khartoum, Khartoum, P.O. Box 321 (Sudan); ElAgib, Ibrahim [College of Applied and Industrial Science, Department of Physics, University of Juba, Khartoum, P.O. Box 12327/1 (Sudan); College of Science, King Saud University, P.O. Box 2455 (Saudi Arabia)

    2011-10-01

    This paper investigates the possibility of optimizing the performance of the neutron backscattering method in landmine detection by designing a suitable shield around a {sup 252}Cf neutron source to reduce the background due to soil and the neutrons emitted from the source that hit the detector directly. A series of Monte Carlo simulations were performed to improve the source shield thickness and to study the elastically backscattered (EBS) {sup 252}Cf neutrons from the buried explosive material TNT in the soil; the optimal configuration was examined against different soil types and source heights. The results obtained in terms of performance of the relative (EBS) neutrons confirmed that the proposed source shield has significantly improved the signal to background ratio. Higher signal-to-background ratio was observed using {sup 252}Cf neutron source as compared to Pu-Be source.

  4. Investigations of shield effect and type of soil on landmine detection

    Science.gov (United States)

    Elsheikh, Nassreldeen; Habbani, Farouk; ElAgib, Ibrahim

    2011-10-01

    This paper investigates the possibility of optimizing the performance of the neutron backscattering method in landmine detection by designing a suitable shield around a 252Cf neutron source to reduce the background due to soil and the neutrons emitted from the source that hit the detector directly. A series of Monte Carlo simulations were performed to improve the source shield thickness and to study the elastically backscattered (EBS) 252Cf neutrons from the buried explosive material TNT in the soil; the optimal configuration was examined against different soil types and source heights. The results obtained in terms of performance of the relative (EBS) neutrons confirmed that the proposed source shield has significantly improved the signal to background ratio. Higher signal-to-background ratio was observed using 252Cf neutron source as compared to Pu-Be source.

  5. [Immune protection against rubella in a group of women in Latium].

    Science.gov (United States)

    Fischetti, M; Melino, C; Venza, F

    1991-02-15

    This paper reports data concerning the immune status of 252 pregnant women with regard to rubella infection. The inverse haemagglutination was used to titrate rubella virus-antibodies and it was carried out for each pregnant woman on two blood samples, collected at three weeks' interval. Thirty-nine of the 252 pregnant women (15.50%) contracted the infection in the first trimester of pregnancy. Fifty-seven women (22.60%) showed a low degree of protection against the infection while only forty-five women had a protective rubella virus-antibody titre. Finally, 111 of the 252 (44.60%) pregnant women were rubella virus seronegative and therefore susceptible to the infection.

  6. Equivalent properties of single event burnout induced by different sources

    Institute of Scientific and Technical Information of China (English)

    YANG Shi-Yu; CAO Zhou; DA Dao-An; XUE Yu-Xiong

    2009-01-01

    The experimental results of single event burnout induced by heavy ions and 252Cf fission fragments in power MOSFET devices have been investigated. It is concluded that the characteristics of single event burnout induced by 252Cf fission fragments is consistent to that in heavy ions. The power MOSFET in the "turn-off" state is more susceptible to single event burnout than it is in the "turn-on" state. The thresholds of the drain-source voltage for single event burnout induced by 173 MeV bromine ions and 252Cf fission fragments are close to each other, and the burnout cross section is sensitive to variation of the drain-source voltage above the threshold of single event burnout. In addition, the current waveforms of single event burnouts induced by different sources are similar. Different power MOSFET devices may have different probabilities for the occurrence of single event burnout.

  7. Exxon Valdez to Deepwater Horizon: comparable toxicity of both crude oils to fish early life stages.

    Science.gov (United States)

    Incardona, John P; Swarts, Tanya L; Edmunds, Richard C; Linbo, Tiffany L; Aquilina-Beck, Allisan; Sloan, Catherine A; Gardner, Luke D; Block, Barbara A; Scholz, Nathaniel L

    2013-10-15

    The 2010 Deepwater Horizon disaster in the Gulf of Mexico was the largest oil spill in United States history. Crude oils are highly toxic to developing fish embryos, and many pelagic fish species were spawning in the northern Gulf in the months before containment of the damaged Mississippi Canyon 252 (MC252) wellhead (April-July). The largest prior U.S. spill was the 1989 grounding of the Exxon Valdez that released 11 million gallons of Alaska North Slope crude oil (ANSCO) into Prince William Sound. Numerous studies in the aftermath of the Exxon Valdez spill defined a conventional crude oil injury phenotype in fish early life stages, mediated primarily by toxicity to the developing heart. To determine whether this type of injury extends to fishes exposed to crude oil from the Deepwater Horizon - MC252 incident, we used zebrafish to compare the embryotoxicity of ANSCO alongside unweathered and weathered MC252 oil. We also developed a standardized protocol for generating dispersed oil water-accommodated fractions containing microdroplets of crude oil in the size range of those detected in subsurface plumes in the Gulf. We show here that MC252 oil and ANSCO cause similar cardiotoxicity and photo-induced toxicity in zebrafish embryos. Morphological defects and patterns of cytochrome P450 induction were largely indistinguishable and generally correlated with polycyclic aromatic compound (PAC) composition of each oil type. Analyses of embryos exposed during different developmental windows provided additional insight into mechanisms of crude oil cardiotoxicity. These findings indicate that the impacts of MC252 crude oil on fish embryos and larvae are consistent with the canonical ANSCO cardiac injury phenotype. For those marine fish species that spawned in the northern Gulf of Mexico during and after the Deepwater Horizon incident, the established literature can therefore inform the assessment of natural resource injury in the form of potential year-class losses.

  8. Synthesis of a functionalized europium complex and deposition of luminescent Langmuir-Blodgett (LB) films

    OpenAIRE

    Adati, Renata D.; Pavinatto, Felippe José; Monteiro, Jorge H.S.K. [UNESP; Marian R. Davolos; Jafelicci, Miguel, Jr.; Oliveira Junior, Osvaldo Novais de

    2012-01-01

    The synthesis, characterization and formation of Langmuir-Blodgett (LB)films for the luminescent [(C12H25)(2)(CH3)(2)N][Eu(tta)(4)] complex, where [(C12H25)(2)(CH3)(2)](N+) is didodecyldimethylammonium and the tta ligand is thenoyltrifluoroacetone, are reported. The coordination of tta ligands to the Eu3+ ion was confirmed by FTIR spectroscopy and the emission spectrum comprised bands corresponding to D-5(0) -> F-7(0-4) transitions. The lifetime (tau) from the emission state (D-5(0))was 0....

  9. Modeling Robot Dynamic Performance for Endpoint Force Control

    Science.gov (United States)

    1988-08-01

    Task Dynamics 55 2.5.1 The Dynamic Workpiece Model 55 2.5.2 Adding Robot Dynamics 56 2.5.3 Adding Actuator Dynamics 56 Tabie I o iiau 6 2.6 Grip...motion control system. Robot dynamics couple with the task dynamics in a very complex way. When the robot makes contact with the environment, the impact...robot flexibility or actuator dynamics. 2.5.2 Adding Robot Dynamics Figure 2.29 shows the robot now represented by two lumped masses, as in the robot

  10. Drug: D00512 [KEGG MEDICUS

    Lifescience Database Archive (English)

    Full Text Available D00512 Drug Phenytoin (JP16/USP/INN); Dilantin (TN) C15H12N2O2 252.0899 252.268 D00...here is a strong association between the risk of developing SJS/TEN with Phenytoin treatment and the presenc...ystem 113 Antiepileptics 1132 Hydantoins D00512 Phenytoin (JP16/USP/INN) Anatomic...PTICS N03AB Hydantoin derivatives N03AB02 Phenytoin D00512 Phenytoin (JP16/USP/INN) USP drug classification ...[BR:br08302] Anticonvulsants Sodium Channel Agents Phenytoin D00512 Phenytoin (JP

  11. Gclust Server: 114438 [Gclust Server

    Lifescience Database Archive (English)

    Full Text Available 114438 CEL_H14A12.4_17553886 Cluster Sequences Related Sequences(46) 252 mls-1: Mesodermal Lineage Specifica...ences Related Sequences(46) Sequence length 252 Representative annotation mls-1: Mesodermal Lineage Specif...ication family member (mls-1) Number of Sequences 1 Homologs 1 Clustering threshold...tion family member (mls-1) 1 1.00e-22 0.0 0.0 0.0 0.0 0.0 12.5 Show 114438 Cluster

  12. NEUTRON ACTIVATION ANALYSIS APPLICATIONS AT THE SAVANNAH RIVER SITE USING AN ISOTOPIC NEUTRON SOURCE

    Energy Technology Data Exchange (ETDEWEB)

    Diprete, D; C Diprete, C; Raymond Sigg, R

    2006-08-14

    NAA using {sup 252}Cf is used to address important areas of applied interest at SRS. Sensitivity needs for many of the applications are not severe; analyses are accomplished using a 21 mg {sup 252}Cf NAA facility. Because NAA allows analysis of bulk samples, it offers strong advantages for samples in difficult-to-digest matrices when its sensitivity is sufficient. Following radiochemical separation with stable carrier addition, chemical yields for a number methods are determined by neutron activation of the stable carrier. In some of the cases where no suitable stable carriers exist, the source has been used to generate radioactive tracers to yield separations.

  13. Transport Efficiency of Gas-jet Tape Transport System

    Institute of Scientific and Technical Information of China (English)

    WandXudong; MaRuichang; XieYuanxiang; XingYebin; XuShuwei; LiZhankui

    2003-01-01

    The Gas-jet Tape Transport System (GTTS) was used in several on-line experiments. The transport efficiency of GTTS was studied with three different inorganic salts, PbI2, PbC12 and NaC1, by using a 252 Cf source. The fission fragments of 252Cf were transported and collected by the GTTS before measurement. Nitrogen gas was used as a substitute of cxpensive Helium gas, in consideration of longer stopping range of fragments. The fragments were also directly collected on Aluminum foils with thickness of 50μm for original yield measurement.

  14. Reproductive biology of the masked triggerfish Sufflamen fraenatus

    Digital Repository Service at National Institute of Oceanography (India)

    Sahayak, S.

    and line landings at Tuticorin. The sample consisted of 289 males and 252 females of total length (tip of snout to tip of upper caudal lobe) rang- ing from 175-358 mm. Data on total length (TL), weight, sex and appearance of go- nads were noted from... diameter of ova from middle of the ovary was taken in further studies. Length at first maturity Gonads of 252 females of length range 166 mm to 290 mm were studied to de- termine the size at first maturity. The 72 Satish Sahayak Table 1. Maturity stages...

  15. Investigation on Preventing SF6 Gas Liquefaction For Gas Insulated Metal-enclosed Switchgear in Alpine Regin%严寒地区防止全封闭组合电器SF6气体液化的方案探讨

    Institute of Scientific and Technical Information of China (English)

    李强

    2015-01-01

    阐述了252kV GIS在户外严寒地区运行时,为防止SF6气体液化所采取的措施.设计了三种不同结构的加热器,并分别计算了加热器的功率,用试验验证了加热器的效果,解决了252kVGIS在高寒地区SF6气体液化的问题.

  16. Angular response performance study of a new Harshaw neutron albedo TLD

    Energy Technology Data Exchange (ETDEWEB)

    Liu, J.C.; Sims, C.S. (Oak Ridge National Lab., TN (USA)); West, L.; Welty, T. (Arkansas Univ., Fayetteville, AK (USA). Southwest Radiation Calibration Center)

    1990-01-01

    The angular response of a new Harshaw albedo neutron TLD was studied with two sources: a bare {sup 252}Cf source and a {sup 252}Cf source moderated by a 15 cm D{sub 2}O sphere covered with a cadmium shell. The effect of photon angular dependence on the neutron response of the albedo TLD was examined with {sup 137}Cs and X rays. The angular response performance of the albedo TLD was also evaluated in terms of the directional dose equivalent quantity. The results of these studies are presented and discussed. (author).

  17. Neutron Detector Signal Processing to Calculate the Effective Neutron Multiplication Factor of Subcritical Assemblies

    Energy Technology Data Exchange (ETDEWEB)

    Talamo, Alberto [Argonne National Lab. (ANL), Argonne, IL (United States). Nuclear Engineering Division; Gohar, Yousry [Argonne National Lab. (ANL), Argonne, IL (United States). Nuclear Engineering Division

    2016-06-01

    This report describes different methodologies to calculate the effective neutron multiplication factor of subcritical assemblies by processing the neutron detector signals using MATLAB scripts. The subcritical assembly can be driven either by a spontaneous fission neutron source (e.g. californium) or by a neutron source generated from the interactions of accelerated particles with target materials. In the latter case, when the particle accelerator operates in a pulsed mode, the signals are typically stored into two files. One file contains the time when neutron reactions occur and the other contains the times when the neutron pulses start. In both files, the time is given by an integer representing the number of time bins since the start of the counting. These signal files are used to construct the neutron count distribution from a single neutron pulse. The built-in functions of MATLAB are used to calculate the effective neutron multiplication factor through the application of the prompt decay fitting or the area method to the neutron count distribution. If the subcritical assembly is driven by a spontaneous fission neutron source, then the effective multiplication factor can be evaluated either using the prompt neutron decay constant obtained from Rossi or Feynman distributions or the Modified Source Multiplication (MSM) method.

  18. On-line charge breeding using ECRIS and EBIS

    Science.gov (United States)

    Vondrasek, Richard

    2016-06-01

    The efficient and rapid production of a high-quality, pure beam of highly charged ions is at the heart of any radioactive ion beam facility. Whether an electron cyclotron resonance (ECR) ion source or an electron beam ion source (EBIS) is used to produce these highly charged ions, their operating characteristics will set the boundaries on the range of experiments which can be performed. In addition, time structure and duty cycle have to be considered when defining the operating parameters of the accelerator system as a whole. At Argonne National Laboratory (ANL), an ECR charge breeder was developed as part of the Californium Rare Ion Breeder Upgrade (CARIBU) program. The charge breeding efficiency and high charge state production of the source is at the forefront of ECR charge breeders, but its overall performance as part of the accelerator system is limited by pervasive background and relatively long breeding times. As such, an EBIS charge breeder has been developed and is running in an off-line configuration. It has already demonstrated good breeding efficiencies, shorter residence times, and reduced background and is scheduled to replace the ECR charge breeder in late 2015. The resultant change in duty cycle and time structure necessitates changes to the overall operation of the facility. The experiences with these breeders, as well as from several other facilities which already utilize an ECR or EBIS for charge breeding, help to define the operational characteristics of each technology - their strengths, their weaknesses, and the possible paths to improvement.

  19. Significant relationships among frost tolerance and net photosynthetic rate, water use efficiency and dehydrin accumulation in cold-treated winter oilseed rapes.

    Science.gov (United States)

    Urban, Milan Oldřich; Klíma, Miroslav; Vítámvás, Pavel; Vašek, Jakub; Hilgert-Delgado, Alois Albert; Kučera, Vratislav

    2013-12-15

    Five winter oilseed rape cultivars (Benefit, Californium, Cortes, Ladoga, Navajo) were subjected to 30 days of cold treatment (4 °C) to examine the effect of cold on acquired frost tolerance (FT), dehydrin (DHN) content, and photosynthesis-related parameters. The main aim of this study was to determine whether there are relationships between FT (expressed as LT50 values) and the other parameters measured in the cultivars. While the cultivar Benefit accumulated two types of DHNs (D45 and D35), the other cultivars accumulated three additional DHNs (D97, D47, and D37). The similar-sized DHNs (D45 and D47) were the most abundant; the others exhibited significantly lower accumulations. The highest correlations were detected between LT50 and DHN accumulation (r=-0.815), intrinsic water use efficiency (WUEi; r=-0.643), net photosynthetic rate (r=-0.628), stomatal conductance (r=0.511), and intracellular/intercellular CO2 concentration (r=0.505). Those cultivars that exhibited higher Pn rate in cold (and further a significant increase in WUEi) had higher levels of DHNs and also higher FT. No significant correlation was observed between LT50 and E, PRI, or NDVI. Overall, we have shown the selected physiological parameters to be able to distinguish different FT cultivars of winter oilseed rape.

  20. Studies of Beta-Delayed Neutron Emission using Trapped Ions

    Science.gov (United States)

    Siegl, Kevin; Aprahamian, A.; Scielzo, N. D.; Savard, G.; Clark, J. A.; Levand, A. F.; Burkey, M.; Caldwell, S.; Czeszumska, A.; Hirsh, T. Y.; Kolos, K.; Marley, S. T.; Morgan, G. E.; Norman, E. B.; Nystrom, A.; Orford, R.; Padgett, S.; Pérez Galván, A.; Sh, K. S.; Strauss, S. Y.; Wang, B. S.

    2017-01-01

    Using a radio-frequency quadrupole ion trap to confine radioactive ions allows indirect measurements of beta-delayed neutron (BDN) emission. By determining the recoil energy of the beta-decay daughter ions it is possible to study BDN emission, as the neutron emission can impart a significantly larger nuclear recoil than from beta-decay alone. This method avoids most of the systematic uncertainties associated with direct neutron detection but introduces dependencies on the specifics of the decay and interactions of the ion with the RF fields. The decays of seven BDN precursors were studied using the Beta-decay Paul Trap (BPT) to confine fission fragments from the Californium Rare Isotope Breeder Upgrade (CARIBU) facility at Argonne National Laboratory. The analysis of these measurements and results for the branching ratios and neutron energy spectra will be presented. Supported by the NSF under grant PHY-1419765, and the U.S. DOE under the NEUP project 13-5485, contracts DE-AC02-06CH11357 (ANL) and DE-AC52-07NA27344 (LLNL), and award DE-NA0000979 (NNSA).