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Higher-order approximate solutions of fractional stochastic point kinetics equations in nuclear reactor dynamics

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Nuclear science and Techniques 2019年第3期30卷 114-126页

作者： s.singh s.saha Ray Department of Mathematics National Institute of Technology Rourkela

stochastic point kinetics equations(sPKEs) are a system of Ito? stochastic differential equations whose solution has been obtained by higher-order *** this study, a fractional model of sPKEs has been analyzed. The efficiency of the proposed higher-order approximation scheme has been discussed in the results section. The solutions of sPKEs in the presence of Newtonian temperature feedback have also been provided to further discuss the physical behavior of the fractional model.

关键词： Fractional stochastic point reactor kinetics equations Fractional calculus Higher-order approximation Caputo derivative Neutron population

Finite deformation analysis of crack tip fields in plastically compressible hardening–softening–hardening solids

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Acta Mechanica sinica 2017年第1期33卷 148-158页

作者： D.Khan s.singh A.Needleman Mechanical Engineering Department Indian Institute of Technology Banaras Hindu University Department of Materials science & Engineering Texas A&M University College Station

Crack tip fields are calculated under plane strain small scale yielding conditions. The material is characterized by a finite strain elastic-viscoplastic constitutive relation with various hardening-softening-hardening hardness functions. Both plastically compressible and plastically incompressible solids are considered. Displacements corresponding to the isotropic linear elastic mode I crack field are prescribed on a remote boundary. The initial crack is taken to be a semi-circular notch and symmetry about the crack plane is imposed. Plastic compressibility is found to give an increased crack opening displacement for a given value of the applied loading. The plastic zone size and shape are found to depend on the plastic compressibility, but not much on whether material softening occurs near the crack tip. On the other hand, the near crack tip stress and deformation fields depend sensitively on whether or not material softening occurs. The combination of plastic compressibility and softening (or softening-hardening) has a particularly strong effect on the near crack tip stress and deformation fields.

关键词： Plasticity Crack tip fields Fracture Compressible solids Material softening

Metrology for sub-Rayleigh-length target positioning in~10^(22)W/cm^(2)laser-plasma experiments

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High Power Laser science and Engineering 2024年第3期12卷 90-105页

作者： E.A.Vishnyakov A.sagisaka K.Ogura T.Zh.Esirkepov B.Gonzalez-Izquierdo C.D.Armstrong T.A.Pikuz s.A.Pikuz W.Yan T.M.Jeong s.singh P.Hadjisolomou O.Finke G.M.Grittani M.Nevrkla C.M.Lazzarini A.Velyhan T.Hayakawa Y.Fukuda J.K.Koga M.Ishino K.Kondo Y.Miyasaka A.Kon M.Nishikino Y.V.Nosach D.Khikhlukha I.P.Tsygvintsev D.Kumar J.Nejdl D.Margarone P.V.sasorov s.Weber M.Kando H.Kiriyama Y.Kato G.Korn K.Kondo s.V.Bulanov T.Kawachi A.s.Pirozhkov ELI Beamlines Facility The Extreme Light Infrastructure ERICDolníBrežanyCzech Republic Kansai Institute for Photon science(KPsI) QSTKyotoJapan Central Laser Facility Rutherford Appleton LaboratorySTFCHarwell OxfordDidcotUK Institute for Open and Transdisciplinary Research Initiatives Osaka UniversityOsakaJapan HB11 Energy Holdings FreshwaterAustralia Key Laboratory for Laser Plasmas(Ministry of Education) School of Physics and AstronomyShanghai Jiao Tong UniversityShanghaiChina Collaborative Innovation Center of IFsA Shanghai Jiao Tong UniversityShanghaiChina Institute of Plasma Physics AsCR PragueCzech Republic FZU-Institute of Physics AsCR PragueCzech Republic Czech Technical University in Prague FNSPEPragueCzech Republic Institute of Laser Engineering Osaka UniversityOsakaJapan Institute of Physics National Academy of Sciences of UkraineKyivUkraine IsTEQ AR YerevanArmenia

Tight focusing with very small f-numbers is necessary to achieve the highest at-focus ***,tight focusing imposes strong demands on precise target positioning in-focus to achieve the highest on-target irradiance We describe several near-infrared,visible,ultraviolet and soft and hard X-ray diagnostics employed in a~10^(22)W/cm^(2)laser±plasma *** used nearly 10 J total energy femtosecond laser pulses focused into an approximately1.3-μm focal spot on 5±20μm thick stainless-steel *** discuss the applicability of these diagnostics to determine the best in-focus target position with approximately 5μm accuracy(i.e.,around half of the short Rayleigh length)and show that several diagnostics(in particular,3ωreflection and on-axis hard X-rays)can ensure this *** demonstrated target positioning within several micrometers from the focus,ensuring over 80%of the ideal peak laser intensity *** approach is relatively fast(it requires 10±20 laser shots)and does not rely on the coincidence of low-power and high-power focal planes.

关键词： laser-plasma interaction precise target positioning spectroscopy ultra-high intensity X-rays

Copper-Induced Changes in the Urea Uptake and Urease Activity in the Cyanobacteria Anabaena doliolum and Anacystis nidulans:Interaction With sulphur Containing Amino Acids

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Biomedical and Environmental sciences 1995年第2期8卷 158-163页

作者： s.singh B.B.singh 等 DepartmentofMicrobiology NorthMaharashtraUniversityJalgaon－425001India DepartmentofMicrobiology Nor

Copper-induced changes in the urea uptake and urease activity have been investigated in the cyanobacteria Anabaena doliolum and Anacystis nidulans. Copper, at and above 5 μmol/L concentration, inhibited urea uptake and urease activity systems in both the cyanobacteria in a concentration dependent manner. However, the urea uptake and urease activity systems in A. nidulans appeared slightly more tolerant to copper than that of ***. The inhibitory effect of copper on urea uptake and urease activity was mitigated by sulphur containing amino acids (cystine and cysteine), however, methionine could not do so, indicating the involvement of sulfhydryl (-sH) groups in the assimilation of urea in cyanobacteria

关键词： Activity HEPEs Copper-Induced Changes in the Urea Uptake and Urease Activity in the Cyanobacteria Anabaena doliolum and Anacystis nidulans

Radioisotope production using lasers:From basic science to applications

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Matter and Radiation at Extremes 2024年第3期9卷 31-44页

作者： M.R.D.Rodrigues A.Bonasera M.scisciò J.A.Pérez-Hernández M.Ehret F.Filippi P.L.Andreoli M.Huault H.Larreur D.singappuli D.Molloy D.Raffestin M.Alonzo G.G.Rapisarda D.Lattuada G.L.Guardo C.Verona Fe.Consoli G.Petringa A.McNamee M.La Cognata s.Palmerini T.Carriere M.Cipriani G.Di Giorgio G.Cristofari R.De Angelis G.A.P.Cirrone D.Margarone L.Giuffrida D.Batani P.Nicolai K.Batani R.Lera L.Volpe D.Giulietti s.Agarwal M.Krupka s.singh Fa.Consoli Cyclotron Institute Texas A&M UniversityCollege StationTexas 77840USA Laboratori Nazionali del sud Istituto Nazionale di Fisica Nucleare(LNS-INFN)CataniaItaly ENEA Fusion and Technologies for Nuclear Safety and Security Department-CFrascatiItaly Centro de Láseres Pulsados(clpu) VillamayorSpain Universidad de salamanca SalamancaSpain Centre Lasers Intenses et Applications(CELIA) Universitéde BordeauxCNRSCEATalenceFrance HB11 Energy Holdings Pty FreshwaterNew South WalesAustralia school of Mathematics and Physics Queen’s University BelfastBelfastUnited Kingdom Dipartimento di Fisica e Astronomia“E.Majorana ”Università di CataniaCataniaItaly Facoltàdi Ingegneria e Architettura Universitàdegli Studi di Enna“Kore”EnnaItaly Dipartimento di Ingegneria Industriale Universitàdi Roma“Tor Vergata”RomaItaly Dipartimento di Fisica e Geologia Universitàdegli Studi di PerugiaPerugiaItaly Istituto Nazionale di Fisica Nucleare Sezione di PerugiaPerugiaItaly ELI Beamlines Facility the Extreme Light Infrastructure ERICDolni BrezanyCzech Republic ETsIA Universidad Politécnica de MadridMadridSpain Dipartimento Fisica “E.Fermi”Universitàdi Pisa and INFNPisaItaly FZU–Institute of Physics of Czech Academy of sciences PragueCzech Republic Institute of Plasma Physics of Czech Academy of sciences PragueCzech Republic

The discovery of chirped pulse amplification has led to great improvements in laser technology,enabling energetic laser beams to be compressed to pulse durations of tens of femtoseconds and focused to a few *** with energies of tens of MeV can be accelerated using,for instance,target normal sheath acceleration and focused on secondary *** such conditions,nuclear reactions can occur,with the production of radioisotopes suitable for medical *** use of high-repetition lasers to produce such isotopes is competitive with conventional methods mostly based on *** this paper,we study the production of^(67)Cu,^(63)Zn,^(18)F,and^(11)C,which are currently used in positron emission tomography and other *** the same time,we study the reactions^(10)B(p,α)^(7)Be and^(70)Zn(p,4n)^(67)Ga to put further constraints on the proton distributions at different angles,as well as the reaction^(11)B(p,α)^(8)Be relevant for energy *** experiment was performed at the 1 PW laser facility at VegaⅢin salamanca,*** distributions of radioisotopes in the forward(with respect to the laser direction)and backward directions were measured using a high purity germanium *** results are in reasonable agreement with numerical estimates obtained following the approach of Kimura and Bonasera[*** ***.,sect.A 637,164–170(2011)].

关键词： purity estimates backward

Influence of Vitamin E on Preventive or Therapeutic Effect of MFA and DTPA in Cadmium Toxicity

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Biomedical and Environmental sciences 1995年第1期8卷 59-64页

作者： s.K.TANDON s.singh IndustrialToxicologyResearchCentre PostBoxNo.80MahatmaGnadhiMargLucknow226001India IndustrialToxic

The influence of vitamin E supplementation on the ability of α-mercapto-β(2-furyl)acrylic acid (MFA) or calcium trisodium dicthylenetriamine pentaacetate (DTPA) to reduce body burden of cadmium and reverse Cd-induced biochemical alterations was investigated in Cd-exposed rats. The treatment with MFA-vitamin E or CaNa3 DTPAvitandn E was more effective than either vitamin E or chelating agent alone, in depleting blood and tissue Cd. However, the combined treatment showed only limited advantage over the individuals in restoring Cd-induced biochemical changes. Further, the treatment with chelator-vitamin E concomitantly with the exposure to Cd was more effective than post-Cd exposure treatment.

关键词： DTPA MFA

Renal Toxicity of Nickel,sodium Lauryl sulphate and Their Combination after Dermal Application in Guinea Pigs

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Biomedical and Environmental sciences 1993年第3期6卷 231-236页

作者： A.K.MATHUR B.N.GUPTA A.singh s.singh RAVIsHANKER Industrial IndustrialIndustrialIndustrialIndustrial Toxicology Research CentreP.B.No80Mahatoma Gandhi MargLucknow-226001IndiaToxicology Research CentreP.B.No80Mahatoma Gandhi MargLucknow-226001IndiaToxicology Research CentreP.B.No80Mahatoma Gandhi MargLucknow-226001IndiaToxicology Research CentreP.B.No80Mahatoma Gandhi MargLucknow-226001IndiaToxicology Research CentreP.B.No80Mahatoma Gandhi MargLucknow-226001India

The guinea pigs were dermally exposed to nickel (Ni), sodium lauryl sulphate (sLs) and in their combination for 7 and 14 days. The exposure to Ni and sLs produced changes in enzymes and lipid peroxidation in kidney. The exposure to Ni or sLs depicted slight changes while combined exposure to Ni plus sLs exhibited more degenerative changes in kidney. The result of the study suggests that industrial workers and/or populations exposed simultaneously to Ni and sLs produces more damage to kidney.

关键词： sLs Ni Renal Toxicity of Nickel,sodium Lauryl sulphate and Their Combination after Dermal Application in Guinea Pigs

Dermal Toxicity of Paraphenylenediamine

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Biomedical and Environmental sciences 1992年第4期5卷 321-324页

作者： A.K.MATHUR B.N.GUPTA s.singh A.singh s.NARANG Industrial Toxicology Research Centre P.B. 80 Mahatama Gandhi MargIndustrial Toxicology Research Centre P.B. 80 Mahatama Gandhi MargIndustrial Toxicology Research Centre P.B. 80 Mahatama Gandhi MargIndustrial Toxicology Research Centre P.B. 80 Mahatama Gandhi MargIndustrial Toxicology Research Centre P.B. 80 Mahatama Gandhi Marg Lucknow 226001 IndiaLucknow 226001 IndiaLucknow 226001 IndiaLucknow 226001 IndiaLucknow 226001 India

The guinea pigs were dermally exposed to paraphenylenediamine (PPD) and in presence of an oxidising agent hydrogen peroxide for 15 and 30 d to assess their effects on some enzymes, lipid peroxidation and histamine contents in the skin. The activities of acid and alkaline phosphatases, β-glucuronidase, gamma glutamyl transpeptidase, histidase and tyrosinase were enhanced after application of either PPD or PPD plus hydrogen peroxide. The lipid peroxidation and histamine contents also showed marked elevation following exposure to the chemicals.

关键词： PPD Dermal Toxicity of Paraphenylenediamine

Computational simulations of near-continuum gas flow using Navier-stokes-Fourier equations with slip and jump conditions based on the modal discontinuous Galerkin method

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Advances in Aerodynamics 2020年第1期2卷 145-181页

作者： T.Chourushi A.Rahimi s.singh R.s.Myong school of Mechanical and Aerospace Engineering and ACTRC&ReCAPT Gyeongsang National UniversityJinjuGyeongnam 52828South Korea school of Physical and Mathematical sciences Nanyang Technological University21 Nanyang LinkSingapore 637371Singapore

Blunt-body configurations are the most common geometries adopted for non-lifting re-entry *** re-entry vehicles experience different flow regimes during flight due to drastic changes in atmospheric *** conventional Navier-stokes-Fourier equations with no-slip and no-jump boundary conditions may not provide accurate information regarding the aerothermodynamic properties of blunt-bodies in flow regimes away from the *** addition,direct simulation Monte Carlo method requires significant computational resources to analyze the near-continuum flow *** overcome these shortcomings,the Navier-stokes-Fourier equations with slip and jump conditions were numerically solved.A mixed-type modal discontinuous Galerkin method was employed to achieve the appropriate numerical *** computational simulations were conducted for different blunt-body configurations with varying freestream Mach and Knudsen *** results show that the drag coefficient decreases with an increased Mach number,while the heat flux coefficient *** the other hand,both the drag and heat flux coefficients increase with a larger Knudsen ***,for an Apollo-like blunt-body configuration,as the flow enters into non-continuum regimes,there are considerable losses in the lift-to-drag ratio and stability.

关键词： Near-continuum flow Discontinuous Galerkin method slip and jump conditions