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Analytical modelling of the expansion of a solid obstacle interacting with a radiative shock

High Power Laser science and Engineering 2018年第2期6卷 123-132页

作者： Th.Michel E.Falize B.Albertazzi G.rigon Y.sakawa T.sano H.shimogawara r.Kumar T.Morita C.Michaut A.Casner r Barroso P.Mabey Y.Kuramitsu s.Laffite L.Van Box som G.Gregori r.Kodama N.Ozaki P.Tzeferacos D.Lamb M.Koenig luli-cnrs ecole polytechniquecea:universite paris-saclayupmc univ paris 06:sorbonne universites-f-91128 palaiseau cedexFrance cea damdifF-91297 ArpajonFrance cea saclay dsm/irfu/service d'astrophysiqueF-91191 Gif-sur-YvetteFrance institute of laser engineering osaka universitySuitaOsaka 565-0871Japan faculty of engineering sciences kyushu university6-1 Kasuga-KoenKasugaFukuoka 816-8580Japan luth observatoire de parispsl research universitycnrsuniversite paris diderotSorbonne Paris Cite92190 MeudonFrance universite de bordeaux-cnrs-cea celia UMR 5107F-33405 TalenceFrance gepi observatoire de parispsl research universitycnrsuniversite paris diderotSorbonne Paris Cite75014 ParisFrance graduate school of engineering osaka universitySuitaOsaka 565-0871Japan lerma observatoire de parispsl research universitycnrssorbonne universitesUPMC Univ.Paris 06F-75005 ParisFrance clarendon laboratory university of oxfordParks RoadOxford OX1 3PUUK flash center for computational science university of chicagoIL 60637USA

In this paper, we present a model characterizing the interaction of a radiative shock(rs) with a solid material, as described in a recent paper(Koenig et al., Phys. Plasmas, 24, 082707(2017)), the new model is then related to recent experiments performed on the GEKKO XII laser facility. The rs generated in a xenon gas cell propagates towards a solid obstacle that is ablated by radiation coming from the shock front and the radiative precursor, mimicking processes occurring in astrophysical phenomena. The model presented here calculates the dynamics of the obstacle expansion,which depends on several parameters, notably the geometry and the temperature of the shock. All parameters required for the model have been obtained from experiments. Good agreement between experimental data and the model is found when spherical geometry is taken into account. As a consequence, this model is a useful and easy tool to infer parameters from experimental data(such as the shock temperature), and also to design future experiments.

关键词： high energy density physics laser–plasmas interaction modelling plasmas astrophysics plasma physics radiative hydrodynamics radiative shock

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中奥陶统有机质组合及其对奥陶系派生原油的影响

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国外油气勘探 1991年第1期 1-9页

作者： s.r.Jacobson 胡望水

在衣阿华州,热未成熟到边际成熟的生油岩中,存在两种偏向生油的独特中奥陶世有机质组合。显然更易于生油的A组合产生独有的"奥陶系石油"指纹,与微化石Gloeocapsamorpha prisca的有机壳有关。B组合则产生了更加常见的标记。这两类组合在... 详细信息

在衣阿华州,热未成熟到边际成熟的生油岩中,存在两种偏向生油的独特中奥陶世有机质组合。显然更易于生油的A组合产生独有的"奥陶系石油"指纹,与微化石Gloeocapsamorpha prisca的有机壳有关。B组合则产生了更加常见的标记。这两类组合在北美许多奥陶系沉积中混合或交替出现,可以解释来自奥陶系生油岩的多种原油类型。这种混合物也有助于解释***的化学性质。化验了衣阿华州三口井中钻入Decorah组古登堡段向下到***砂岩的原生碳酸盐岩层序的岩心样品。对生油岩的沥青抽提物和附近的石油进行显微镜、roc-Eval热解和毛细管气相色层分离分析,用来评价两类组合。A组合占优势的岩石中溶剂抽提物有鉴别奥陶系的气相色谱标记,在C11—C19正构烷烃范围内存在奇数碳优势、较重正构烷烃含量低、实质上缺失包含姥鲛烷和植烷在内的类异戊二烯。尽管A组合只出现在极薄层中,仍有生油潜力,以致几英寸厚的岩层可能很重要。含B组合占优势的岩石抽提物显示了奇数碳优势减小、正构烷烃的全剖面特征以及明显地存在包括姥鲛烷和植烷的类异戊二烯。在北美、欧州波罗的海地区、澳大利亚大多数古生代盆地所见到的中奥陶生油岩中,衣阿华州的这些岩样具代表性。因此,从衣阿华州这些中奥陶岩石样品得出的结论,给在其它许多地区发现的奥陶系石油多样解释提供了依据。

关键词：生油岩有机质组合奥陶系正构烷烃溶解抽提热解抽提

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GAs sOrPTION AND TrANsPOrT IN POLY (PHENYLENE OXIDE)(PPO)AND ArYL-BrOMINATED PPO MEMBrANEs

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Chinese Journal of Polymer science 1989年第4期7卷 306-314页

作者：贾连达 F. r. sHEU r.T.CHErN H.B.HOPFENBErG Changchun Institute of Applide Chemistry Academia SinicaChangchunPRC Department of Chemical Engineering North Carolina State UniversityRaleighNC 27695USA

The apparent solubility (s), concentration-average diffusivity (D), and permeability (P), for C0_2, CH_4 and N_2 through PPO and aryl-brominated PPO at 35℃ for pressure ranging from 1 to 26 atm are reported. It is found that P, D, and s of the membranes to all the three gases vary with the extent of bromination. s increases with the increase of the percent of bromine in each case, but D to CO_2 increases remarkably only at higher degree of brominafion, and therefore, P to CO_2 is increased by more than 100% over a wide range ofpressure in the case. The solubility data are well described by the dual mode sorption model. It is found that the gas molecules sorbed by the Langmuir mode are relatively more immobilized and the contribution of the nonequilibrinm character of the polymer to gas permeation increases obviously for CO_2 and is hardly changed for CH_4 with increasing bromine content. These observations are interpreted in terms of changes in specific free volume (sFV)and the cohesive energy density (CED) of the polymers.

关键词： Poly (Phenylene Oxide) (PPO) Bromination Membrane Permeability.

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可靠性理论与实务

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丛书名：中兴经理管理丛书

1984年

作者： s.r.Calabro 褚昆成译

是台北中兴管理顾问公司1984年版的影印本。

关键词：数理科学和化学数学概率论与数理统计

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A High Order Formula to Approximate the Caputo Fractional Derivative

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Communications on Applied Mathematics and Computation 2020年第1期2卷 1-29页

作者： r.Mokhtari F.Mostajeran Department of Mathematical sciences Isfahan University of TechnologyIsfahan 84156-83111Iran

We present here a high-order numerical formula for approximating the Caputo fractional derivative of order𝛼for 0<α<*** new formula is on the basis of the third degree Lagrange interpolating polynomial and may be use... 详细信息

We present here a high-order numerical formula for approximating the Caputo fractional derivative of order𝛼for 0rmula is on the basis of the third degree Lagrange interpolating polynomial and may be used as a powerful tool in solving some kinds of fractional ordinary/partial diff erential *** comparison with the previous formulae,the main superiority of the new formula is its order of accuracy which is 4−α,while the order of accuracy of the previous ones is less than *** must be pointed out that the proposed formula and other existing formulae have almost the same computational *** eff ectiveness and the applicability of the proposed formula are investigated by testing three distinct numerical ***,an application of the new formula in solving some fractional partial diff erential equations is presented by constructing a fi nite diff erence scheme.A PDE-based image denoising approach is proposed to demonstrate the performance of the proposed scheme.

关键词： Caputo fractional derivative Fractional partial differential equation Finite difference scheme

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Analytic study of Magnetohydrodynamic Flow and Boundary Layer Control Over a Wedge

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Acta Mathematicae Applicatae sinica 2008年第4期24卷 541-552页

作者： M.Chandrasekar s.Baskaran Department of Mathematics Anna UniversityChennai-600 025India Department of Mathematics S.S.N.College of EngineeringKalavakkamChennai-603 110India

A genuine variational principle developed by Gyarmati, in the field of thermodynamics of irreversible processes unifying the theoretical requirements of technical, environmental and biological sciences is employed to study the effects of uniform suction and injection on MHD flow adjacent to an isothermal wedge with pressure gradient in the presence of a transverse magnetic field. The velocity distribution inside the boundary layer has been considered as a simple polynomial function and the variational principle is formulated. The Euler-Lagrange equation is reduced to a simple polynomial equation in terms of momentum boundary layer thickness. The velocity profiles, displacement thickness and the coefficient of skin friction are calculated for various values of wedge angle parameter m, magnetic parameter ξ and suction/injection parameter H. The present results are compared with known available results and the comparison is found to be satisfactory. The present study establishes high accuracy of results obtained by this variational technique.

关键词： Magnetohydrodynamics suction/injection skin friction Gyarmati's variational principle wedge parameter

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simulation of Variable Viscosity and Jeffrey Fluid Model for Blood Flow Through a Tapered Artery with a stenosis

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Communications in Theoretical Physics 2012年第1期57卷 133-140页

作者： Noreen sher Akbar s.Nadeem Department of Mathematics Quaid-i-Azam University 45320Islamabad 44000Pakistan Department of Mathematics&Natural sciences Prince Mohammad Bin Fahd UniversityP.O.Box 1664Al Khobar 31952Kingdom of Saudi Arabia

Non-Newtonian fluid model for blood flow through a tapered artery with a stenosis and variable viscosity by modeling blood as Jeffrey fluid has been studied in this paper. The Jeffrey fluid has two parameters, the relaxation time A1 and retardation time A2. The governing equations are simplified using the case of mild stenosis. Perturbation method is used to solve the resulting equations. The effects of non-Newtonian nature of blood on velocity profile, temperature profile, wall shear stress, shearing stress at the stenotsis throat and impedance of the artery are discussed. The results for Newtonian fluid are obtained as special case from this model.

关键词： Jeffrey two constant fluid model blood flow tapered artery stenosis variable viscosity analyticalsolution

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Wear characteristics of copper-based surface-level microcomposites and nanocomposites prepared by friction stir processing

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Friction 2016年第1期4卷 39-49页

作者： s.CArTIGUEYEN K.MAHADEVAN Department of Mechanical Engineering Pondicherry Engineering College Pondicherry 605014 India

In this study, microsized and nanosized silicon carbide particles (siCps) were successfully incorporated into commercial pure copper to form a surface metal matrix composite by friction stir processing (FsP) at low-heat-input conditions. A cluster of blind holes on a copper plate was used as particle deposition technique during the fabrication of the composite. Pin-on-disc testing was performed under dry sliding conditions to determine the wear characteristics of prepared composite surfaces. The homogeneity of particle distribution both inside the copper matrix and in the wear scar was determined via microstructural observations. It was observed that both microsized and nanosized siCps were well distributed and homogenous in a stir zone; particles observed were without defects, and good bonding was observed between siCps and the copper matrix. Comparisons between Cu/siCp composite layers and friction stir processed (FsPed) Cu and as-received Cu showed that Cu/siCp nanocomposite layers exhibited superior microhardness and dry sliding wear characteristics.

关键词： friction stir processing surface engineering surface metal matrix composites microstructure hardness wear characteristics

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BENDING BEHAVIOr OF EMPTY AND FOAM-FILLED ALUMINUM TUBEs WITH DIFFErENT CrOss-sECTIONs

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Acta Mechanica solida sinica 2012年第6期25卷 616-626页

作者： M. H. shojaeifard H. r. Zarei r. Talebitooti M. Mehdikhanlo school of Automotive Engineering Iran University of Science and Technology Faculty of Aerospace Engineering Aeronautical University of Science and Technology

In this paper, the energy absorption mechanism of empty and foam-filled aluminum tubes with different cross-sections （circular, square and elliptic） under bending load is investigated numerically. The load-displacement curves of the present simulations are in very good agreement with those of published experimental data. Here, the existing analytical formulations are reviewed and compared with experimental results. In addition, the effects of different cross-sections and wall thicknesses on the energy absorption capacity and specific energy absorption of these tubes are fully investigated. The results indicate that the energy absorption of an elliptic foam-filled tube with 1.5 mm and 2 mm thicknesses increases about 45% and 73% in comparison with a square one, respectively.

关键词： plastic bending foam filled energy absorption

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施氮对香稻某些生理效应的研究

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华南农业大学学报 1997年第3期18卷 13-17页

作者：李之林 r.s.sarkar s.K.Nayak I.ravi 华南农业大学农学系印度中央水稻研究所植物生理系

用１个非香稻品种Ｒａｔｎａ和３个香稻品种ＨＫＲ２２８，Ｂａｓｍａｔｉ３７０及ＣＢⅡ施氮和不施氮处理对比试验结果，施氮可使稻株光合作用、呼吸作用、植株含氮量提高。但是，施氮对光合作用的促进作用未达差异显著水平。对比非香... 详细信息

用１个非香稻品种Ｒａｔｎａ和３个香稻品种ＨＫＲ２２８，Ｂａｓｍａｔｉ３７０及ＣＢⅡ施氮和不施氮处理对比试验结果，施氮可使稻株光合作用、呼吸作用、植株含氮量提高。但是，施氮对光合作用的促进作用未达差异显著水平。对比非香稻品种Ｒａｔｎａ和香稻品种ＨＫＲ２２８，施氮对叶片呼吸作用的促进作用前者大于后者。植株幼穗分化和抽穗期，呼吸作用和植株含氮量发生明显变化。抽穗后，稻株各部分含氮水平为叶片＞穗＞叶鞘＞茎。Ｂａｓｍａｔｉ３７０茎秆纤细，植株偏高，施氮对株高的促进率明显大于其他３个品种。这是妨碍Ｂａｓｍａｔｉ型香稻品种进一步提高产量的重要生理原因。

关键词：水稻香稻品种生理效应氮肥施肥

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