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Target fabrication for the POLAR experiment on the Orion laser facility

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High Power Laser Science and Engineering 2015年第1期3卷 70-75页

作者： C.Spindloe D.Wyatt D.Haddock i.East J.E.Cross C.N.Danson E.Falize J.m.Foster m.Koenig G.Gregori Target Fabrication Group Central Laser Facility Rutherford Appleton Laboratory Harwell Science and Innovation Campus Atomic and Laser Physics Clarendon Laboratory University of Oxford AWE CEA-DAm-DiF Laboratoire pour l’Utilisation Des Laser intense UMR 7605 CNRS-CEA-Ecole Polytechnique-Université Paris VI

This article describes the fabrication of a suite of laser targets by the Target Fabrication group in the Central Laser Facility(CLF), STFC Rutherford Appleton Laboratory for the first academic-access experiment on the Orion laser facility(Hopps et al., Appl. Opt. 52, 3597–3601(2013)) at Atomic Weapons Establishment(AWE). This experiment, part of the POLAR project(Falize et al., Astrophys. Space Sci. 336, 81–85(2011); Busschaert et al., New J. Phys. 15, 035020(2013)),studied conditions relevant to the radiation-hydrodynamic processes occurring in a remarkable class of astrophysical star systems known as magnetic cataclysmic variables. A large number of complex fabrication technologies and research and development activities were required to field a total of 80 high-specification targets. Target design and fabrication procedures are described and initial alignment and characterization data are discussed.

关键词： astrophysics microtargets

Study of Current Sheath Velocity and its Distribution Using Tridimensional magnetic Probe in Sahand Plasma Focus

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Plasma Science and Technology 2015年第5期17卷 353-357页

作者： m.A.mOHAmmADi S.HEDYEH Department of Atomic and molecular Physics Faculty of PhysicsUniversity of Tabriz Research Center of Astrophysics and Applied Physics University of Tabriz

The current sheath velocity in 0.25 Torr gas pressure of Filippov type plasma focus is studied experimentally. By using two tridimensional magnetic probes on top of the anode surface, the current sheath velocity is measured for argon, oxygen and nitrogen. Additionally, the effect of charging voltage on the current sheath velocity is studied in both axial and radial phases. We found that, the maximum current sheath velocities at both radial and axial phases are respectively 4.33 ± 0.28 （cm/μs） and 3.92 ± 0.75 （cm/μs） with argon as the working gas at 17 kV. Also, the minimum values of current sheath velocity are 1.48 ± 0.15 （cm/μs） at the radial phase and 1.14 ± 0.09 （cm/μs） at the axial phase with oxygen at 12 kV. The current sheath velocity at the radial phase is higher than that at the axial phase for all gases and voltages. in this study, variation of the full width half maximum （FWHm） of magnetic probe signals with voltage is investigated for different gases at radial and axial phases.

关键词： plasma focus tridimensional magnetic probe current sheath dynamics

Using a mach–Zehnder interferometer to deduce nitrogen density mapping

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Chinese Physics B 2015年第7期24卷 336-340页

作者： F.Boudaoud m.Lemerini Department of Physics University Abou Bekr Belkaid

This work presents an optical method using the mach–Zehnder interferometer. We especially diagnose a pure nitrogen gas subjected to a point to plane corona discharge, and visualize the density spatial map. The interelectrode distance equals6 mm and the variation of the optical path has been measured at different pressures： 220 Torr, 400 Torr, and 760 *** interferograms are recorded with a CCD camera, and the numerical analysis of these interferograms is assured by the inverse Abel transformation. The nitrogen density is extracted through the Gladstone–Dale relation. The obtained results are in close agreement with values available in the literature.

关键词： mach–Zehnder interferometer Gladstone–Dale equation Abel inversion corona discharge

Reliable Field Distortion Spark Gap for Plasma Focus

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Plasma Science and Technology 2007年第4期9卷 504-507页

作者： S.HUSSAiN m.ZAKAULLAH Department of Physics University of Sargodha40100 SargodhaPakistan Department of Physics Quaid-i-Azam University45320 IslamabadPakistan

A simple, low cost, easily maintained, and reliable field distortion spark gap has been developed to operate at a voltage up to 30 kV. The header construction necessary to attach the spark gap switch to a single 12.5 μF, 40 kV （10 k J） capacitor is described. The main features of the spark gap are its wide range of voltage operation, high current capacity, low inductance and long lifetime. The performance of spark gap has been tested in a plasma focus and results are presented in this report.

关键词： field distortion spark gap plasma focus

Synthesis of Thermoresponsive Poly( diethyleneglycol methacrylate-co-6-Ovinyladipoyl-D-glucopyranose) Glycopolymer via RAFT Polymerization

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Journal of Donghua University(English Edition) 2014年第4期31卷 515-519页

作者：孙衎徐慕儒 SYEDA Um-i-Zahra 聂华丽权静朱利民 College of Chemistry Chemical Engineering and BiotechnologyDonghua University

The monomer 6-O-vinyladipoyl-D-glucopyranose( VAG)was synthesized by lipase catalyzed trans-esterification of divinyladipate with D-glucopyranose. A novel double hydrophilic glycopolymer poly( diethyleneglycol methacrylate-co-6-Ovinyladipoyl-D-glucopyranose)( P( DEGmA-co-VAG)) with narrow polydispersity( PDi) and thermosensitivity was prepared by reversible addition-fragmentation chain transfer( RAFT)polymerization. P( DEGmA-co-VAG) was characterized by1 H NmR,FTiR and gel permeation chromatography( GPC). The characterization of UV-visible spectroscopy showed that the micelles from glycopolymer P( DEGmA-co-VAG) were thermo-responsive and the low critical solution temperature( LCST) could be controlled by the molar ratio of monomers. When the molar ratio of DEGmA and VAG was 2∶ 1,the LCST of P( DEGmA-co-VAG) was36 ℃ in aqueous solution,which could form nano micelles in the human body environment. it was found that P( DEGmA-co-VAG)was non-toxic at 0. 1-1 mg / m L concentrations when incubated with pig iliac endothelial cells( PiECs) for 24 h. Thus,the synthesized glycopolymers has great potential as drug delivery carriers.

关键词： thermoresponsive glycopolymer reversible additionfragmentation chain transfer(RAFT) polymerization non-toxic

Generalised Chain Conditions,Prime ideals,and Classes of Locally Finite Lie Algebras

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Algebra Colloquium 2021年第1期28卷 63-86页

作者： Falih A.m.Aldosray ian Stewart Department of mathematics Umm Al-Qura UniversityP.O.Box 56199MakkahSaudi Arabia mathematics institute University of WarwickCoventry CV47ALUK

A Noetherian(Artinian)Lie algebra satisfies the maximal(minimal)condition for *** include quasi-Noetherian and quasi-Artinian Lie *** study conditions on prime ideals relating these *** prove that the radical of any ideal of a quasi-Artinian Lie algebra is the intersection of finitely many prime ideals,and an ideally finite Lie algebra is quasi-Noetherian if and only if it is *** properties are equivalent to *** also prove a structure theorem for serially finite Artinian Lie algebras.

关键词： Lie algebra chain condition prime ideal radical locally finite

Simulation and calibration of granules using the discrete element method

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Particuology 2014年第1期12卷 40-43页

作者： Peter müller Jürgen Tomas institute of Process Engineering Mechanical Process EngineeringOtto-von-Guericke University MagdeburgUniversitätsplatz 239106 MagdeburgGermany

The discrete element method （DEm）, developed by Cundall and 5track to solve geomecnamcai problems, is used to simulate the mechanical behavior of granules. According to the DEm, an individ ual granule can be modeled as a realistic mechanical system consisting of primary particles bonded by interaction forces. Cranulometric properties of the model material, zeolite 4A, have been measured to determine their macro properties. To investigate the compression behavior, a compression test was performed using a strength tester on single granules between two pistons. A modeled granule consisting of more than 22,000 primary particles was generated. The micro properties of the modeled granule have been precisely set to allow its macro properties to be equivalent to the macro properties of zeolite 4A granules. To calibrate the mechanical properties, diametrical compression was simulated using two rigid walls stressed at a constant stressing velocity, The force-displacement curve of the modeled granule at compression has been calibrated by the experimental curve of zeolite 4A.

关键词： Discrete element method material behavior Granulation

Effects of an Electric Field on the Cylindrical Dust Acoustic Wave in magnetized Complex Plasmas

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Chinese Physics Letters 2012年第7期29卷 184-186页

作者： B.Farokhi m.Eghbali Department of Physics Faculty of ScienceArak UniversityArak 38156-8-8349Iran

Stability of a dust acoustic wave in cylindrical complex plasmas is *** of a static magnetic field (axial) and an electric field (radial) on the propagation of a low frequency wave are *** linear dispersion relations of rotational modes and breathing modes are *** a dusty plasma is confined in a finite region,the void behavior is observed at high speed *** structures of different-mode-number solutions are illustrated.

关键词： wave cylindrical illustrated

Thermal Conductivity of Ce Doped Bi-2212 Superconductors

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Chinese Physics Letters 2004年第7期21卷 1337-1339页

作者： LiBo WUBai-mei m.Ausloos StructuralResearchLaboratory DepartmentofPhysicsUniversityofScienceandTechnologyofChinaHefei230026 SUPRATECS B5UniversitedeLiegeB-4000LiegeBelgium

The temperature dependence of the thermal conductivity in Bi2Sr2Ca1-xCexCu2Oy x = 0.1, 0.2, 0.3, 0.4 is presented. With increasing Ce-doping level, the thermal conductivity peak under Tc is suppressed then disappears, while another peak appears at low temperatures for the non-superconducting compounds. The numerical analysis shows that the thermal conductivity peak under Tc can be well described by the normal electron relaxation-time contribution model, and the phonon-induced thermal conductivity peak could be well described within the Debye approximation of the phonon spectrum. The existence and variation of these two thermal conductivity peaks indicate the adjustability between the superconducting and insulating components in the samples with different Ce-doping levels.

关键词： Superconductivity