检索结果-南通市图书馆

Fast efficient photon deceleration in plasmas by using two laser pulses at different frequencies

在线全文

学校读者我要写书评

暂无评论

Matter and Radiation at Extremes 2024年第3期9卷 11-18页

作者： Y.X.wang X.L.Zhu s.M.weng p.Li X.F.Li h.Ai h.R.pan Z.M.sheng Key Laboratory for Laser plasmas(moe) School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center of IFsA Shanghai Jiao Tong UniversityShanghai 200240China Research Center of Laser Fusion of China Academy of Engineering physics MianyangSichuan 621900China state key Laboratory of high Field Laser physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Tsung-dao Lee Institute Shanghai Jiao Tong UniversityShanghai 200240China

The generation of ultrashort high-power light sources in the mid-infrared(mid-IR)to terahertz(Thz)range is of interest for applications in a number of fields,from fundamental research to biology and *** conventional laser technology,photon deceleration in plasma wakes provides an alternative approach to the generation of ultrashort mid-IR or Thz ***,we present a photon deceleration scheme for the efficient generation of ultrashort mid-IR or Thz pulses by using an intense driver laser pulse with a relatively short wavelength and a signal laser pulse with a relatively long *** signal pulse trails the driver pulse with an appropriate time delay such that it sits at the front of the second wake bubble that is driven by the driver *** to its relatively long wavelength,the signal pulse will be subjected to a large gradient of the refractive index in the plasma wake ***,the photon deceleration in the plasma wake becomes faster and more efficient for signal pulses with longer *** greatly enhances the capacity and efficiency of photon deceleration in the generation of ultrashort high-power light sources in the long-wavelength IR and Thz spectral ranges.

关键词： laser ultrashort photon

Insensitivity of a turbulent laser-plasma dynamo to initial conditions

在线全文

学校读者我要写书评

暂无评论

Matter and Radiation at Extremes 2022年第4期7卷 50-64页

作者： A.F.A.Bott L.Chen p.Tzeferacos C.A.J.palmer A.R.Bell R.Bingham A.Birkel D.h.Froula J.Katz M.w.Kunz C.-K.Li h-s.park R.petrasso J.s.Ross B.Reville D.Ryu F.h.séguin T.G.white A.A.schekochihin D.Q.Lamb G.Gregori Department of physics University of OxfordOxfordUnited Kingdom Department of Astrophysical sciences University of PrincetonPrincetonNew Jersey 08544USA Department of physics and Astronomy University of RochesterRochesterNew York 14627USA Laboratory for Laser Energetics University of RochesterRochesterNew York 14623USA school of Mathematics and physics Queens University BelfastBelfastUnited Kingdom Rutherford Appleton Laboratory ChiltonDidcotUnited Kingdom Department of physics University of StrathclydeGlasgowUnited Kingdom Massachusetts Institute of Technology CambridgeMassachusetts 02139USA Lawrence Livermore National Laboratory LivermoreCalifornia 94550USA Max-planck-Institut für Kernphysik HeidelbergGermany Department of physics School of Natural SciencesUNISTUlsanSouth Korea Department of physics University of NevadaRenoNevada 89557USA Department of Astronomy and Astrophysics University of ChicagoChicagoIllinois 60637USA

It has recently been demonstrated experimentally that a turbulent plasma created by the collision of two inhomogeneous,asymmetric,weakly magnetized,laser-produced plasma jets can generate strong stochastic magnetic fields via the small-scale turbulent dynamo mechanism,provided the magnetic Reynolds number of the plasma is sufficiently *** this paper,we compare such a plasma with one arising from two pre-magnetized plasma jets whose creation is identical save for the addition of a strong external magnetic field imposed by a pulsed magnetic field *** investigate the differences between the two turbulent systems using a Thomson-scattering diagnostic,x-ray selfemission imaging,and proton *** Thomson-scattering spectra and x-ray images suggest that the external magnetic field has a limited effect on the plasma dynamics in the *** the external magnetic field induces collimation of the flows in the colliding plasma jets and although the initial strengths of the magnetic fields arising from the interaction between the colliding jets are significantly larger as a result of the external field,the energies and morphologies of the stochastic magnetic fields post-amplification are *** conclude that,for turbulent laser-plasmas with supercritical magnetic Reynolds numbers,the dynamo-amplified magnetic fields are determined by the turbulent dynamics rather than the seed fields or modest changes in the initial flow dynamics of the plasma,a finding consistent with theoretical expectations and simulations of turbulent dynamos.

关键词： turbulent initial stochastic

规模化沼气工程总挥发酸与碳酸氢盐自动滴定装置

在线全文

学校读者我要写书评

暂无评论

农业机械学报 2015年第9期46卷 217-222,166页

作者：吴树彪陈新颖刘良郭建斌董仁杰中国农业大学农业部可再生能源清洁化利用技术重点实验室北京100083

为及时有效地监测和预警厌氧发酵系统的运行稳定性,根据Nordmann滴定法的原理,设计了一种沼气工程厌氧发酵液总挥发酸(VFA)质量浓度和碳酸氢盐(TIC)质量浓度自动滴定装置。本装置以Lab VIEw为平台,可精确测定厌氧发酵液的VFA质量浓度和... 详细信息

为及时有效地监测和预警厌氧发酵系统的运行稳定性,根据Nordmann滴定法的原理,设计了一种沼气工程厌氧发酵液总挥发酸(VFA)质量浓度和碳酸氢盐(TIC)质量浓度自动滴定装置。本装置以Lab VIEw为平台,可精确测定厌氧发酵液的VFA质量浓度和TIC质量浓度,并能够实现p h计自动标定、自动滴定与补液、生成实时滴定曲线、数据处理与存储等功能。利用该装置对人工配制的混合模拟样品溶液和实际沼气工程的猪粪厌氧发酵液进行滴定试验,结果表明:测定混合模拟样品溶液和实际厌氧发酵液VFA质量浓度和TIC质量浓度的相对标准偏差均在5%以内,结果重复性好,准确度和精密度均比手动滴定法高,可有效避免手动滴定人为误差,提高工作效率,降低劳动强度;装置在连续运行15 h条件下测定结果稳定,运行性能良好,该装置在沼气工程监测和预警方面具有推广价值。

关键词：沼气工程厌氧发酵挥发性脂肪酸碳酸氢盐自动滴定

Effect of Active Mineral Filler on Rutting performance and Fatigue properties of Granite Asphalt Concrete

在线全文

学校读者我要写书评

暂无评论

武汉理工大学学报 2010年第17期32卷 55-58,82页

作者： ZhU Z h wU s p LI w T hUANG X Key Laboratory of silicate Materials science and Engineering Wuhan University of TechnologyWuhan 430070China hubei provincial Building science Research & Design Institute Wuhan 430070China

Granite is well known as an acid aggregate. An active mineral filler produced in the laboratory is first used as an anti-stripping filler in the granite asphalt concrete. Four aggregate gradations were chosen in this study,and the effects of the active mineral filler and aggregates on the rutting resistance performance and fatigue properties of granite asphalt concrete were investigated by means of rutting test and four-point bending fatigue test. The results indicate that the dynamic stability of granite asphalt concrete increase significantly with the addition of active mineral filler and the fatigue properties can also be improved especially at lower strain level. Meanwhile,the results demonstrate that granite asphalt concrete has better rutting resistance performance and fatigue properties than limestone asphalt concrete.

关键词： granite asphalt concrete active mineral filler rutting resistance performance fatigue properties

Numerical estimation of bank-propeller-hull interaction effect on ship manoeu-vring using CFD method

在线全文

学校读者我要写书评

暂无评论

Journal of hydrodynamics 2017年第1期29卷 154-167页

作者： s.Kaidi h.smaoui p.sergent CEREMA-DtecEMF 60280 Margny-les-CompiegneFrance sorbonne universites Universite de technologie de Compiegnelaboratoire Roberval60203 Compiegne cedexFrance

This paper presents a numerical investigation of ship manoeuvring under the combined effect of bank and propeller. The incompressible turbulent flow with free surface around the self-propelled hull form is simulated using a commercial CFD software （ANsYs-FLUENT）. In order to estimate the influence of the bank-propeller effect on the hydrodynamic forces acting on the ship, volume forces representing the propeller are added to Navier-stokes equations. The numerical simulations are carried out using the equivalent of experiment conditions. The validation of the CFD model is performed by comparing the numerical results to the availa- ble experimental data. For this investigation, the impact of ship-Bank distance and ship speed on the bank effect are tested with and without propeller. An additional parameter concerning the advance ratio of the propeller is also tested.

关键词： Viscous fluid flow simulation (CFD) bank effect bank-propeller-hull interaction hydrodynamic forces estimations,advance ratio

在线全文

学校读者我要写书评

暂无评论

水解蛋白质化学改性(英文)

四川大学学报（工程科学版） 2002年第6期34卷 1-8页

作者：陈武勇 Brown E M Taylor M M Cooke p h Marmer w N 四川大学皮革化学与工程教育部重点实验室四川成都610065 美国农业部东部地区研究中心皮革室

从含铬废弃物提取的水解蛋白质与不同量的戊二醛 ,在不同的温度下反应。用聚酰胺凝胶电泳法 (sDs -pAGE)分析了改性蛋白质的分子量及分子量分布。用CanonManning粘度法测定了改性产物的粘度。实验表明改性产物的分子量随戊二醛的用量增... 详细信息

从含铬废弃物提取的水解蛋白质与不同量的戊二醛 ,在不同的温度下反应。用聚酰胺凝胶电泳法 (sDs -pAGE)分析了改性蛋白质的分子量及分子量分布。用CanonManning粘度法测定了改性产物的粘度。实验表明改性产物的分子量随戊二醛的用量增加而增加。最佳的戊二醛用量约为水解胶原质量的 12 % ,反应温度大于 6 0℃。同时 ,用改性产物做了皮革的填充实验 ,用萤光标记改性胶原 ,通过扫描电镜研究了填充皮革的纤维结构。研究结果表明 ,改性产物具有较好的填充性能 ,采用适当的应用工艺 ,改性产物可能用作皮革填充剂。

关键词：化学改性填充性能戊二醛水解蛋白质聚酰胺凝胶电泳法分子量粘度皮革填充剂

OBJECT-ORIENTED TEChNOLOGY :

在线全文

学校读者我要写书评

暂无评论

First-principles Calculation Assisted Thermodynamic Modeling of Ti-Co-Cu Ternary system

2005年

作者： CURTIs h.K. TsANG CLARENCE s.w. LAU YING K. LEUN

Includes bibliographical references (p. 434-437).

ISBN: (数字)0071240462

ISBN: (纸本)9780071240468

Includes bibliographical references (p. 434-437).

关键词： UML (Computer science)

来源：畅想之星图书光盘版（南... 评论

在线全文

畅想之星图书光盘版（南通市图书馆镜像）

学校读者我要写书评

暂无评论

Journal of Materials science & Technology 2010年第4期26卷 317-326页

作者： Y.J. Yang X.M. Tao w.J. Zhu Z.h. Long h.s. Liu Z.p. Jin school of Materials science and Engineering Central South University Changsha 410083 China Key Lab of Non-ferrous Metal science and Engineering Ministry of Education Changsha 410081 China

Thermodynamic assessment of Ti-Co-Cu ternary system has been carried out by combining first-principle calculation and CALphAD method. Firstly, formation enthalpies of stable and hypothesized compounds were calculated by first-principles method. Then, based on reported experimental information, a thermodynamic description of the Ti-Co-Cu ternary system was performed. solution phases were treated as substitutional solutions of which excess Gibbs energies were formulated by Redlich-Kister polynomial, and the intermediate phases were described with sublattice models. All measured isothermal sections were reasonably reproduced. In addition, liquidus projection of this ternary system was further calculated, which may be useful for relevant materials processing.

关键词： First-principle CALphAD Thermodynamic modeling

利水消臌膏联合肝病治疗仪治疗乙肝肝硬化顽固性腹水的临床疗效

在线全文

学校读者我要写书评

暂无评论

中国实验方剂学杂志 2022年第22期28卷 123-130页

作者：王岗朱琦陈新岳仁宋车德亚成都中医药大学附属医院成都610075 自贡市第一人民医院四川自贡643000

目的:观察利水消臌膏外敷联合肝病治疗仪治疗乙肝后肝硬化顽固性腹水的疗效。方法:按随机数字表法把120例乙肝后肝硬化顽固性腹水患者分为对照组、观察组,每组各60例。对照组予以DsG-Ⅲ肝病治疗仪和常规西医基础治疗,观察组在对照组基... 详细信息

目的:观察利水消臌膏外敷联合肝病治疗仪治疗乙肝后肝硬化顽固性腹水的疗效。方法:按随机数字表法把120例乙肝后肝硬化顽固性腹水患者分为对照组、观察组,每组各60例。对照组予以DsG-Ⅲ肝病治疗仪和常规西医基础治疗,观察组在对照组基础上加利水消臌膏肝区及腹部外敷。连续治疗4周,对比分析两组患者治疗前后体质量、腹围、24 h尿量、临床症状量化积分、肝功能、内皮素-1(ET-1)、一氧化氮(NO)、γ干扰素(IFN-γ)的变化情况,并用彩色多普勒超声评估治疗前后门静脉血流动力学变化情况。结果:两组患者经治疗4周后,观察组治疗总有效率为87.72%(50/57),高于对照组的67.9%(38/56),差异具有统计学意义(χ^(2)=6.411,ph尿量均优于本组治疗前(ppppsT)、白蛋白/球蛋白(AGR)、ET-1、NO、IFN-γ各指标组内比较标均优于本组治疗前(pppv))、最大血流速度(V_(max)),门脉血流量(Q)均有明显改善(ppv)、V_(max)、Q改善程度优于对照组(p<0.05)。结论:利水消臌膏外敷联合肝病治疗仪可显著提高乙肝后肝硬化顽固性腹水的有效率,作用机制可能与减少NO、ET-1水平,增加IFN-γ水平和改善门静脉血流动力学有关。

关键词：乙肝后肝硬化顽固性腹水利水消臌膏中药外敷肝病治疗仪