检索结果-南通市图书馆

Minimum-Modified Debye-Hückel Theory for Size-Asymmetric Electrolyte Solutions with Moderate Concentrations

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2023年第5期36卷 553-560,I0001,I0002页

作者： Tiejun Xiao yun zhou Guizhou Provincial Key Laboratory of Computational Nano-Material Science Guizhou Synergetic Innovation Center of Scientific Big Data for Advanced Manufacturing TechnologyGuizhou Education UniversityGuiyang 550018China

A minimum-modified Debye-Hückel(DH)theory for electrolytes with size asymmetry is ***-pared with the conventional DH theory,the minimum-modified DH theory only introduces an extra surface charge density to capture the electrostatic effect of the size asymmetry of the electrolytes and hence facilitates a boundary element method for electrostatic potential *** theory can distinguish the electrostat-ic energies and excess chemical potentials of ions with the same sizes but opposite charges,and is applied to a binary primitive electrolyte solution with moderate electrostatic *** with the hyper-netted chain theory,the validity of this modified DH theory demonstrates significant improvement over the conventional DH theory.

关键词： Electrolyte solution Size-asymmetry Debye-Hückel theory Electrostatic ener-gy Chemical potential

Convergence Theorems for λ-strict Pseudo-contractions in q-uniformly Smooth Banach Spaces

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2010年第4期26卷 743-758页

作者： Hai yun zhou College of Mathematics and Information Science Hebei Normal University Shijiazhuang 050016 P. R. China Department of Mathematics Shijiazhuang Mechanical Engineering College Shijiazhuang 050003 P. R. China

In this paper, we continue to discuss the properties of iterates generated by a strict pseudo- contraction or a finite family of strict pseudo-contractions in a real q-uniformly smooth Banach space. The results presented in this paper are interesting extensions and improvements upon those known ones of Marino and Xu [Marino, G., Xu, H. K.： Weak and strong convergence theorems for strict pseudo-contractions in Hilbert spaces. J. Math. Anal. Appl., 324, 336-349 （2007）]. In order to get a strong convergence theorem, we modify the normal Mann＇s iterative algorithm by using a suitable convex combination of a fixed vector and a sequence in C. This result extends a recent result of Kim and Xu [Kim, T. H., Xu, H. K.： Strong convergence of modified Mann iterations. Nonl. Anal., 61, 51- 60 （2005）] both from nonexpansive mappings to λ-strict pseudo-contractions and from Hilbert spaces to q-uniformly smooth Banach spaces.

关键词： convergence theorem λ-strict pseudo-contraction the normal Mann iteration the Ishika- wa-like iteration q-uniformly smooth Banach spaces

Weak Convergence Theorems for Strict Pseudo-contractions in Banach Spaces

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2014年第5期30卷 755-766页

作者： Hai yun zhou Department of Mathematics Shijiazhuang Mechanical Engineering College

In this paper, it is shown that there is a gap in the paper [Chidume, C. E., Shahzad, N.： Weak convergence theorems for a finite family of strict pseudo-contractions. Nonlinear Anal., 72, 1257–1265（2010）], consequently, the main results of the paper do not hold in uniformly smooth Banach spaces. Meanwhile, it is also shown that the main results（Lemma 3.4, Theorems 3.5–3.6, 3.8–3.9） in the paper [Cholamjiak, P., Suantai, S.： Weak convergence theorems for a countable family of strict pseudo-contractions in Banach spaces. Fixed Point Theory Appl., 2010, Article ID 632137, 16 pages（2010）] do not hold in Lpfor p 〉 3. Finally, some modified results are presented in the setting of uniformly smooth and uniformly convex Banach spaces which include Lpfor p ≥ 2 as special cases. Furthermore, our arguments are also different from the ones given by the authors above.

关键词： Fr′echet differentiable Banach spaces Reich's inequality a countable family of λ-strict pseudo-contractions normal Mann iteration algorithm weak convergence theorems

The Ergodicity of a Class of Almost Anosov Systems

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2013年第1期29卷 193-198页

作者： yun Hua zhou College of Mathematics and Statistics Chongqing University

In this paper, we prove that some volume-preserving almost Anosov systems are ergodic if they are essentially accessible. The key idea is that there are stable and unstable manifolds with uniform size on the orbits Of... 详细信息

关键词： Ergodicity almost Anosov essential accessibility

Effects of single lance configuration on coal combustion process in tuyere from viewpoint of coal plume

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2021年第7期28卷 785-798页

作者： yun-hua zhou Ping zhou Jia-yun Dan Hong-jie Yan Dong-ling Wu Valin Xiangtan Iron and Steel Corporation Xiangtan 411101HunanChina School of Energy Science and Engineering Central South UniversityChangsha 410083HunanChina

Pulverized coal utilization in the blast furnace is decided by the particle flow and combustion behaviors in the *** a specific operating condition,these behaviors are directly related to the lance configuration in the upstream tuyere *** on single straight lance,six types of single lance configurations were designed by assembling four parameters in different *** four parameters are the lance diameter,lance insertion angle,and the horizontal and vertical distances from the lance tip to the tuyere *** different lance configuration schemes applied,the pulverized coal combustion process in the lance-blowpipe-tuyere zone was *** simulation results regarding particle diffusion and combustion behaviors were characterized by three indicators from the viewpoint of a coal *** are the plume diffusion angle,diffusion uniformity,and the average plume temperature at the tuyere *** promote coal utilization,the values of these indicators under different configurations were analyzed,yielding two optimal *** first one is to reduce the lance length immersed in the blowpipe-tuyere by 100 *** other is to increase the horizontal distance from the lance tip to the tuyere outlet by 50 mm,and the insertion angle to 11° with the lance tip located at the tuyere *** findings can enhance the understanding of the influence mechanism of lance con-figuration on the coal utilization and provide guidelines for the design of new lance configurations.

关键词： Pulverized coal plume Particle dispersion Lance configuration Blast furnace

Multi-time Collaborative Restoration for Integrated Electrical-gas Distribution Systems Based on Rolling Optimization

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CSEE Journal of Power and Energy Systems 2024年第2期10卷 660-671页

作者： Jingyang yun Zheng Yan yun zhou Peichao Zhang Weidong Hu Key Laboratory of Control of Power Transmission and Conversion of Ministry of Education Department of Electrical EngineeringShanghai Jiao Tong University

This paper proposes a multi-time collaborative restoration model for integrated electricity-gas distribution sys-tems(IEGDSs)considering multiple resources after extreme weather *** on the linearized power flow constraints of the unbalanced electrical distribution system(EDS)and gas distribution system(GDS),this problem can be formulated as a mixed-integer linear programming(MILP)*** improve the efficiency and veracity of the solution,a rolling optimiza-tion based two-stage method is developed with the first stage solved by a linear approximation model,and the second stage solved by real-time updated rolling *** solving the MILP problem using rolling optimization,the proposed model and solution method achieve efficient and reliable collaborative restoration of IEGDS considering multiple resources and unbal-anced operation characteristics of *** effectiveness of the proposed model and method is validated by using an IEGDS made of a 37-bus unbalanced EDS and 11-node *** Terms-Electricity-gas system,mix-integer linear programming,power system restoration.

关键词： Electricity-gas system mix-integer linear programming power system restoration

Castleman disease and TAFRO syndrome:To improve the diagnostic consciousness is the key

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2022年第5期10卷 1536-1547页

作者： Qian-yun zhou Department of Critical Care Medicine Peking University Shougang HospitalBeijing 100144China

BACKGROUND Castleman disease(CD)and TAFRO syndrome are very rare in clinical *** clinicians,especially non-hematological clinicians,do not know enough about the two diseases,so it often leads to misdiagnosis or missed *** To explore the clinical features and diagnosis of CD and TAFRO *** We retrospectively collected the clinical and laboratory data of 39 patients who were diagnosed with CD from a single medical *** Clinical classification identified 18 patients(46.15%)with unicentric Castleman disease(UCD)and 21 patients(53.85%)with multicentric Castleman disease(MCD),the latter is further divided into 13 patients(33.33%)with idiopathic multicentric Castleman disease-not otherwise specified(iMCD-NOS)and 8 patients(20.51%)with TAFRO *** and iMCD are significantly different in clinical manifestations,treatment,and ***,a few patients with MCD were diagnosed as UCD in their early *** was a correlation between two of Thrombocytopenia,anasarca and elevated creatinine,which were important components of TAFRO *** UCD group,the pathologies of lymph modes were mostly hyaline vascular type(13/18,72.22%),however plasma cell type or mixed type could also *** iMCD-NOS group and TAFRO syndrome group,the pathologies of lymph mode shown polarity of plasma cell type and hyaline vascular type *** with patients with TAFRO syndrome,patients with iMCD-NOS were diagnosed more *** The clinical and pathological types of CD are not completely separate,there is an intermediate situation or mixed characteristics between two ends of clinical and pathological *** clinical manifestations of patients with CD are determined by their pathological *** syndrome is a special subtype of iMCD with unique clinical manifestations.

关键词： Castleman disease Diagnosis Lymph node biopsy TAFRO syndrome

Fabrication and magnetic properties of NiFe-ZnO nano-granular films

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2013年第3期32卷 269-272页

作者： Xue-yun zhou Dong-Sheng Yao Faculty of Science Jiujiang University Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology Tianjin University

Excellent soft magnetic and high frequency prop- erties were obtained successfully in the （Ni75Fe25）x（ZnO）1-x granular films fabricated on the glass substrate by RF magnetron oblique sputtering. The microstructure, mag- netic and high frequency properties were investigated systematically. High resolution transmission electron micrographs show that the film consists of fcc Ni75Fe25 particles uniformly embedded in an amorphous insulating matrix ZnO with particle size a few nanometers. The （Ni75Fe25）x（ZnO）1-x films exhibit excellent soft magnetic properties in a widex range from 0.50 to 0.80 with coer- civity not exceeding 5 × 10^-4 T, which is ascribed to the exchange coupling between magnetic particles. Especially for the sample with x = 0.64, coercivities in hard and easy axes are 5.0 ×10^-5 and 3.6 × 10^-4 T, respectively, and the electric resistivity ρ reaches 1,790 μΩ.cm. The dependence of complex permeability u = u′- ju″on frequency f shows that the real part u′ is more than 130 below 500 MHz, and the ferromagnetic resonance fre- quency fr reaches 1.32 GHz, implying the promising for high frequency application.

关键词： Soft magnetic property Nano-granular thinfilms High frequency application

Field measurements for calibration of simplified models of the stiffening effect of infill masonry walls in high-rise RC framed and shear-wall buildings

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2020年第1期19卷 87-104页

作者： zhou yun Pei Yilin zhou Yi Hyeon-Jong Hwang Yi Weijian College of Civil Engineering Hunan UniversityChangsha 410082China Hunan Provincial Key Lab on Damage Diagnosis for Engineering Structures Hunan UniversityChangsha 410082China Key Laboratory for Green&Advanced Civil Engineering Materials and Application Technology of Hunan Province Hunan UniversityChangsha 410082China

As a type of nonstructural component, infill walls play a significant role in the seismic behavior of high-rise buildings. However, the stiffness of the infill wall is generally either ignored or considered by simplified empirical criteria that lead to a period shortening. The difference can be greatly decreased by using a structural identification methodology. In this study, an ambient vibration test was performed on four on-site reinforced concrete high-rise buildings, and the design results were compared with the PKPM models using corresponding finite element(FE) models. A diagonal strut model was used to simulate the behavior of the infill wall, and the identified modal parameters measured from the on-site test were employed to calibrate the parameters of the diagonal strut in the FE models. The SAP2000 models with calibrated elastic modulus were used to evaluate the seismic response in the elastic state. Based on the load-displacement relationship of the infill wall, nonlinear dynamic analysis models were built in PERFORM-3 D and calibrated using the measured modal periods. The analysis results revealed that the structural performance under small/large earthquake records were both strengthened by infill walls, and the contribution of infill walls should be considered for better accuracy in the design process.

关键词： high-rise building ambient vibration test model calibration infi ll wall seismic performance nonlinear dynamic analysis