检索结果-南通市图书馆

A Note on the Cartan Type lie Superalgebra S（n） over a Field of Positive Characteristic

在线全文

学校读者我要写书评

暂无评论

Algebra Colloquium 2014年第3期21卷 521-526页

作者： li ren Qiang Mu Mathematical College Sichuan University Chengdu 610064 China School of Mathematical Sciences Harbin Normal University Harbin 150025 China

The main result of this paper is that every derivation of the finite-dimensional simple modular lie superalgebra S（n） is inner, and S（n） has no nonsingular associative form.

关键词： modular lie superalgebra simple lie superalgebra derivation associativeform

Generalized Fresnel operators corresponding to optical Fresnel diffraction and the squeezed states

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2012年第8期55卷 1345-1350页

作者： li HongQi ren TingQi Department of Physics Qufu Normal University Qufu 273165 China Department of Physics Heze University Heze 274015 China

Corresponding to optical Fresnel diffraction, we show that the exponential quadratic operator exp is actually a generalized single-mode Fresnel operator （GFO） in compact form, where [Q,P]=ih. We also demonstrate that exp{iα[（Q1＋Q2）2＋（p1-P2）2]＋iβ[（Q1-Q2）2＋（p1＋p2）2]＋iy（Q1P2＋Q2P1）} is a two-mode GFO. Their disentangling formula and normal ordering form are derived with the use of technique of integration within an ordered product （IWOP） of operators and the coherent state representation. The squeezed states generated by these two GFOs are obtained.

关键词： Fresnel diffraction single-mode Fresnel operator two-mode Fresnel operator IWOP technique

Effect of Temporal Resolution of NDVI on Potential Evapotranspiration Estimation and Hydrological Model Performance

在线全文

学校读者我要写书评

暂无评论

Chinese Geographical Science 2007年第4期17卷 357-363页

作者： li Xianghu ren liliang State Key Laboratory of Hydrology Water Resources and Hydraulic Engineering Hohai University Nanjing 210098 China

Normalized difference vegetation index (NDVI) data, obtained from remote sensing information, are essential in the Shuttleworth-Wallace (S-W) model for estimation of evapotranspiration. In order to study the effect of temporal resolution of NDVI on potential evapotranspiration (PET) estimation and hydrological model performance, monthly and 10-day NDVI data set were used to estimate potential evapotranspiration from January 1985 to December 1987 in Huangnizhuang catchment, Anhui Province, China. The differences of the two calculation results were analyzed and used to drive the block-wise use of the TOPMODEL with the Muskingum-Cunge routing (BTOPMC) model to test the effect on model performance. The results show that both annual and monthly PETs estimated by 10-day NDVI are lower than those estimated by monthly NDVI. Annual PET from the vegetation root zone (PETr) lowers 9.77%-13.64% and monthly PETr lowers 3.28%-17.44% in the whole basin. PET from the vegetation interception (PETi) shows the same trend as PETr. In addition, temporal resolution of NDVI has more effect on PETr in summer and on PETi in winter. The correlation between PETr as estimated by 10-day NDVI and pan measurement (R2= 0.835) is better than that between monthly NDVI and pan measurement (R2 = 0.775). The two potential evapotranspiration estimates were used to drive the BTOPMC model and calibrate parameters, and model performance was found to be similar. In summary, the effect of temporal resolution of NDVI on potential evapotranspiration estimation is significant, but trivial on hydrological model performance.

关键词： NDVI temporal resolution potential evapotranspiration BTOPMC model

An experimental investigation of tribological performance of triangular textures in water lubrication regime

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2014年第2期57卷 273-279页

作者： XIE Yi li YongJian WANG YuMing suo ShuangFu liU XiangFeng State Key Laboratory of Tribology Tsinghua University

Surface texturing has been considered as an effective approach to improve the tribological *** on the consideration of enhancing the tribological performance,the experiments are carried out to investigate tribological performance of triangular textures in water *** textures are generated by the Nd:YAG laser marking system,with an area density of 20%and a depth of 7 m and are distributed uniformly on the surface of the SiC *** with the circular textures,the triangular textures have obvious tribological *** triangular textures in clockwise direction show the best friction reduction effect among the three *** friction reduction mechanisms of the triangular textures in clockwise direction are also analyzed and discussed.

关键词： triangular textures tribological anisotropy friction reduction

Beyond the lab:a nanoimprint metalens arraybased augmented reality

在线全文

学校读者我要写书评

暂无评论

light(Science & Applications) 2024年第5期13卷 801-802页

作者： Chi li Haoran ren School of Physics and Astronomy Monash UniversityMelbourneVICAustralia

A see-through augmented reality prototype has been developed based on an ultrathin nanoimprint metalens array,opening up a full-colour,video-rate,and low-cost 3D near-eye display.

关键词： cost ens imprint

Shell model calculations for the allowed Gamow-Teller β-decays of light nuclei

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2014年第6期57卷 1005-1012页

作者： li HanTao ren ZhongZhou Department of Physics and Key Laboratory of Modern Acoustics Institute of AcousticsNanjing University Joint Center of Nuclear Science and Technology Nanjing University Center of Theoretical Nuclear Physics National Laboratory of Heavy-Ion Accelerator

The allowed Gamow-Teller β-decay information of li, Be, B, C, and N isotopes under the flame work of nuclear shell model is calculated herein. Theoretical results of Q values, half-lives, excitation energies, log ft values, branching fractions, and β-delayed proton/neutron emission probabilities are tabulated and compared with experimental data. The deviations from the observations are also analyzed. The llBe nucleus is well known for its anomaly ground state Jπ=1/2＋. Thus, we compared the theoretical energy levels with the experimental data and the agreements for low excitation states are consistent. The quenching factor is also evaluated and discussed.

关键词： light nuclei Gamow-Teller β-decay nuclear shell model

S-polar sets of super-Brownian motions and solutions of nonlinear differential equations

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2005年第12期48卷 1683-1695页

作者： li Qiuyue ren Yanxia LMAM School of Mathematical SciencesPeking UniversityBeijing 100871China LMAMSchool of Mathematical SciencesPeking UniversityBeijing 100871China

This paper gives probabilistic expressions of theminimal and maximal positive solutions of the partial differential equation -1/2△v(x) + γ(x)v(x)α = 0 in D, where D is a regular domain in Rd(d ≥ 3) such that its complement Dc is compact, γ(x) is a positive bounded integrable function in D, and 1 ＜α≤ 2. As an application, some necessary and sufficient conditions for a compact set to be S-polar are presented.

关键词： super-Brownian motion,nonlinear differential equation,minimal positive solutions,maximal positive solutions,S-polar sets.

阿戈美拉汀缓解APP/PS1转基因小鼠焦虑及抑郁样行为的机制

在线全文

学校读者我要写书评

暂无评论

中国组织工程研究 2025年第6期29卷 1176-1182页

作者：李甜任俞桦高艳萍苏强山西医科大学基础医学院生理学系细胞生理学教育部重点实验室细胞生理学山西省重点实验室山西省太原市030001 山西医科大学汾阳学院医学检验系山西省汾阳市032200

背景:阿戈美拉汀在临床上用于治疗焦虑、抑郁等相关精神行为异常。前期研究证实,阿戈美拉汀能够有效缓解阿尔茨海默病模型小鼠的认知行为、海马突触可塑性及脑病理特征,然而阿戈美拉汀能否改善阿尔茨海默病模型小鼠的焦虑和抑郁样行为... 详细信息

背景:阿戈美拉汀在临床上用于治疗焦虑、抑郁等相关精神行为异常。前期研究证实,阿戈美拉汀能够有效缓解阿尔茨海默病模型小鼠的认知行为、海马突触可塑性及脑病理特征,然而阿戈美拉汀能否改善阿尔茨海默病模型小鼠的焦虑和抑郁样行为仍不清楚。目的:探究阿戈美拉汀对APP/PS1(阿尔茨海默病)转基因小鼠焦虑和抑郁样行为的改善效应及分子机制。方法:①将18只APP/PS1转基因小鼠随机分为模型对照组(n=9)、模型干预组(n=9),将18只野生型小鼠随机分为对照组(n=9)、干预组(n=9),模型干预组与干预组小鼠腹腔注射阿戈美拉汀10 mg/(kg·d),连续注射31 d后进行高架十字迷宫、强迫游泳行为学实验与海马组织mRNA测序。②取小鼠海马神经元细胞株(HT22)、脑微血管内皮细胞株(bEnd.3),分别分4组培养:空白组不加入任何药物,药物组加入20µmol/L阿戈美拉汀,模型组加入10µmol/Lβ-淀粉样蛋白1-42,实验组加入10µmol/Lβ-淀粉样蛋白1-42+20µmol/L阿戈美拉汀,培养24 h后,免疫印迹检测HT22细胞S416p-tau和S9p-GSK3β的蛋白表达,免疫印迹检测bEnd.3细胞低密度脂蛋白受体相关蛋白1、糖基化终产物受体的蛋白表达。结果与结论:①在高架十字迷宫实验中,模型对照组小鼠的探索开放臂时间与开放臂进入次数均少于对照组(P<0.05),模型干预组小鼠的探索开放臂时间与开放臂进入次数均多于模型对照组(P<0.05);在强迫游泳测试中,模型对照组小鼠的不动时间长于对照组(P<0.05),模型干预组小鼠的不动时间短于模型对照组(P<0.05);海马组织mRNA测序显示,阿戈美拉汀可以增强APP/PS1小鼠海马区低密度脂蛋白受体相关蛋白1的表达。②免疫印迹检测显示,模型组HT22细胞S416p-tau蛋白表达高于空白组(P<0.05),实验组HT22细胞S416p-tau蛋白表达低于模型组(P<0.05),药物组HT22细胞S9p-GSK3β蛋白表达高于空白组(P<0.05),实验组HT22细胞S9p-GSK3β蛋白表达高于模型组(P<0.05),实验组bEnd.3细胞低密度脂蛋白受体相关蛋白1蛋白表达高于模型组(P<0.05)。③结果表明,阿戈美拉汀可通过促进脑内β-淀粉样蛋白和tau的清除来缓解阿尔茨海默病小鼠的焦虑和抑郁样行为。

关键词：阿尔茨海默病阿戈美拉汀 APP/PS1转基因小鼠焦虑抑郁

HEAVY BALL FLEXIBLE GMRES METHOD FOR NONSYMMETRIC liNEAR SYSTEMS

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2022年第5期40卷 711-727页

作者： Mei Yang ren-Cang li School of Mathematical Sciences Shanghai Jiao Tong UniversityShanghai 200240China Department of Mathematics University of Texas at ArlingtonArlingtonTXUSA

Flexible GMRES(FGMRES)is a variant of preconditioned GMRES,which changes preconditioners at every Arnoldi *** often has to be restarted in order to save storage and reduce orthogonalization cost in the Arnoldi *** restarted GMRES,FGMRES may also have to be restarted for the same reason.A major disadvantage of restarting is the loss of convergence *** this paper,we present a heavy ball flexible GMRES method,aiming to recoup some of the loss in convergence speed in the restarted flexible GMRES while keep the benefit of limiting memory usage and controlling orthogonalization *** tests often demonstrate superior performance of the proposed heavy ball FGMRES to the restarted FGMRES.

关键词： GMRES Flexible GMRES Heavy ball GMRES Preconditioner linear system.