检索结果-南通市图书馆

Chemical Research in Chinese Universities 2006年第6期22卷 688-691页

作者： LI Ya-feng ZHANG Li-mei WU Lei-lei WANG Sheng-hai WANG Hai-lian SHANG xuan-xuan College of Chemistry and Molecular Engineering College of Mathematics and Physics Qingdao University of Science ＆ Technology 266042 Qingdao P. R. China

A novel 12-ring network coordination polymer, { [ Cu （ C4 N2 H10 ） 4 ]2 H4 V4 O14 } n （ denoted as QUST-4）, was hydrothermally synthesized and structurally determined by X-ray single-crystal diffraction analysis. QUST-4 was crystallized in a monoelinic system with space group P21/n. The parameters of the unit cell are a = 1. 0497（2） nm, b = 1.6728（3） nm, c=1.2857（3） nm, 3=94. 14（3）°, V=2.2517（8） nm^3, Z=4, Dcal = 1.841 Mg/m^3, R1 = 0. 1071, and wR3 =0. 2703. The largest difference peak and hole were 2284 and - 1040 c/nm^3, respectively. The SBU（ secondary building unit） of QUST-4 was a new cyclo- aggregate of polyoxovanadate cyelo-[ S4V4O14 ]^4 - , different from cyclo-[ V4O12 ]^4-, which was condensed from two tetrahedral and two trigonal bipyramids via ahernate arrangement. Cu（piper） 4 （ piper = piperazine ） group connected the cyclo- [ H4 V4 O14 ] ^4 - anions to form the 12-ring network. The adjacent layers were linked by van der Walls forces.

关键词： Coordination polymer Aggregate of polyoxovanadate Hydrothermal synthesis Network

CURVATURE COMPUTATIONS OF 2-MANIFOLDS IN IR^k

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2003年第5期21卷 681-688页

作者： guo-lian~Xu ChandrajitL.Bajaj AcademyofMathematicsandSystemSciences ChineseAcademyofSciencesBeijing100080China DepartmentofComputerScience UniversityofTexasAustinTX78712

In this paper, we provide simple and explicit formulas for computing Riemannian curvatures, mean curvature vectors, principal curvatures and principal directions for a 2-dimensional Riemannian manifold embedded in IRk... 详细信息

关键词： Riemannian curvature Mean curvature vector Principal curvatures Principal directions.

Parameter identification and state-of-charge estimation approach for enhanced lithium–ion battery equivalent circuit model considering influence of ambient temperatures

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2019年第10期28卷 562-570页

作者： Hui Pang lian-Jing Mou Long guo School of Mechanical and Precision Instrument Engineering Xi’an University of Technology

It is widely accepted that the variation of ambient temperature has great influence on the battery model parameters and state-of-charge(SOC) estimation, and the accurate SOC estimation is a significant issue for developing the battery management system in electric vehicles. To address this problem, in this paper we propose an enhanced equivalent circuit model(ECM) considering the influence of different ambient temperatures on the open-circuit voltage for a lithium-ion battery. Based on this model, the exponential-function fitting method is adopted to identify the battery parameters according to the test data collected from the experimental platform. And then, the extended Kalman filter(EKF) algorithm is employed to estimate the battery SOC of this battery ECM. The performance of the proposed ECM is verified by using the test profiles of hybrid pulse power characterization(HPPC) and the standard US06 driving cycles(US06) at various ambient temperatures, and by comparing with the common ECM with a second-order resistance capacitor. The simulation and experimental results show that the enhanced battery ECM can improve the battery SOC estimation accuracy under different operating conditions.

关键词： lithium-ion battery parameter identification state of charge ambient temperature

Enhanced electroreduction of CO_(2)to C_(2+)fuels by the synergetic effect of polyaniline/CuO nanosheets hybrids

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第7期16卷 9065-9072页

作者： lian Ma Qinghong Geng Longlong Fan Jun-xuan Li Dawei Du Junli Bai Cuiling Li Key Laboratory of Cluster Science Ministry of EducationBeijing Key Laboratory of Photoelectronic/Electrophotonic Conversion MaterialsSchool of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 100081China CAS Key Laboratory of Bio-inspired Materials and Interfacial Science Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China School of Future Technology University of Chinese Academy of SciencesBeijing 100049China Binzhou Institute of Technology Binzhou 256600China

Electrochemically converting CO_(2)to value-added multi-carbon(C_(2+))fuels and chemicals is a favorable way to achieve carbon ***,polyaniline/CuO nanosheets(PANI/CuO NSs)hybrid electrocatalysts are developed in order to achieve superior C_(2+)selectivity by imparting PANI functional component to the CuO *** decorated PANI nanoparticles(NPs)can effectively stabilize the*CO intermediates and increase their coverage on the active Cu sites,which facilitates the C-C coupling to form multi-carbon *** from the synergetic effect of PANI and CuO NSs,best Faradaic efficiency(FE)for C_(2+)product up to 66.4%at-1.6 V *** hydrogen electrode(RHE)in a H-cell measurement and 60.0%at 400 mA·cm^(-2) in a flow cell measurement are demonstrated by PANI/CuO NSs-25 *** importantly,the C_(2+)selectivity keeps stable even in a continuous measurement time period of 92 h in H-cell *** present study may provide more insights for designing efficient hybrid materials toward superior C_(2+)production from electrocatalytic CO_(2)reduction.

关键词： electrochemical CO_(2)reduction CuO nanosheets(NSs) electrocatalysis polyaniline(PANI) C_(2+)selectivity

Wideband mid-infrared thermal emitter based on stacked nanocavity metasurfaces

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

International Journal of Extreme Manufacturing 2022年第1期4卷 133-141页

作者： Tun Cao Meng lian Kuan Liu Xianchao Lou Yaoming guo Dongming guo School of Optoelectronic Engineering and Instrumentation Science Dalian University of TechnologyDalianPeople’s Republic of China Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education Dalian University of TechnologyDalianPeople’s Republic of China

Efficient thermal radiation in the mid-infrared(M-IR)region is of supreme importance for many applications including thermal imaging and sensing,thermal infrared light sources,infrared spectroscopy,emissivity coatings,and *** ability to control light makes metasurfaces an attractive platform for infrared ***,different metamaterials have been proposed to achieve high thermal *** date,broadening the radiation bandwidth of a metasurface emitter(meta-emitter)has become a key goal to enable extensive *** experimentally demonstrate a broadband M-IR thermal emitter using stacked nanocavity metasurface consisting of two pairs of circular-shaped dielectric(Si;N;)–metal(Au)stacks.A high thermal radiation can be obtained by engineering the geometry of nanocavity *** a meta-emitter provides wideband and broad angular absorptance of both p-and s-polarized light,offering a wideband thermal radiation with an average emissivity of more than 80%in the M-IR atmospheric window of 8–14μ*** experimental illustration together with the theoretical framework establishes a basis for designing broadband thermal emitters,which,as anticipated,will initiate a promising avenue to M-IR sources.

关键词： mid-infrared wideband perfect thermal radiation surface plasmon resonance metasurface nanocavity

Dynamical complexity of Anosov systems driven by a quasi-periodic force

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2025年第1期 89-136页

作者： Wen Huang Zeng lian Kening Lu Department of Mathematics University of Science and Technology of China School of Mathematics Sichuan University

Consider C2Anosov systems on a compact manifold driven by a quasi-periodic *** study their dynamical complexity on various levels from the perspectives of both path-wise dynamics and stochastic *** that these systems are non-wandering（i.e.,every point in the phase space is nonwandering）,we prove a set of results:（1） the existence of abundance of random periodic points;（2） a random Liv?ic theorem;（3） a random Ma?é-Bousch-Conze-Guivarc'h lemma;（4） the existence of strong random ***,a concrete example constructed on a 2-dimensional torus is also given to uncover some interesting phenomena of the systems.

关键词：

Simulation methodology development for rotating blade containment analysis

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2012年第4期13卷 239-259页

作者： Qing HE Hai-jun xuan lian-fang LIAO Wei-rong HONG Rong-ren WU High-Speed Rotating Machinery Laboratory Institute of Chemical MachineryZhejiang UniversityHangzhou 310027China Department of Automation Zhejiang UniversityHangzhou 310027China

An experimental and numerical investigation on the aeroengine blade/case containment analysis is presented. Blade out containment capability analysis is an essential step in the new aeroengine design, but containment tests are time-consuming and incur significant costs; thus, developing a short-period and low-cost numerical method is warranted. Using explicit nonlinear dynamic finite element analysis software, the present study numerically investigated the high-speed impact process for simulated blade containment tests which were carried out on high-speed spin testing facility. A number of simulations were conducted using finite element models with different mesh sizes and different values of both the contact penalty factor and the friction coefficient. Detailed comparisons between the experimental and numerical results reveal that the mesh size and the friction coefficient have a considerable impact on the results produced. It is shown that a finer mesh will predict lower containment capability of the case, which is closer to the test data. A larger value of the friction coefficient also predicts lower containment capability. However, the contact penalty factor has little effect on the simulation results if it is large enough to avoid false penetration.

关键词： Aeroengine Blade containment Simulation methodology Mesh size Contact penalty factor Friction coefficient

New Approach to Differential Equations with Countable Impulses

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2011年第2期27卷 255-262页

作者： Hong-Kun Zhang Jin-guo lian Jiong Sun Department of Mathematics and Statistics University of Massachusetts Amherst MA 01003 USA Department of Mathematics Inner Mongolia University Hohhot Inner Mongolia 010021 China

This paper provides a new approach to study the solutions of a class of generalized Jazobi equations associated with the linearization of certain singular flows on Riemannian manifolds with dimension n ＋ 1. A new class of generalized differential operators is defined. We investigate the kernel of the corresponding maximal operators by applying operator theory. It is shown that all nontrivial solutions to the generalized Jacobi equation are hyperbolic, in which there are n dimension solutions with exponential-decaying amplitude.

关键词： countable impulses differential operator hyperbolic Jacobi fields hyperbolicity differential operators

A case-based reasoning approach for task-driven spatial-temporally aware geospatial data discovery through geoportals

在线全文

学校读者我要写书评

暂无评论

International Journal of Digital Earth 2017年第11期10卷 1146-1165页

作者： Ming Li Wei guo lian Duan Xinyan Zhu Institute of Space Science and Technology Nanchang UniversityNanchangPeople’s Republic of China State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan UniversityWuhanPeople’s Republic of China Collaborative Innovation Center of Geospatial Technology WuhanPeople’s Republic of China Key Laboratory of Environment Change and Resources Use in Beibu Gulf(Guangxi Teachers Education University) Ministry of EducationGuangxiPeople’s Republic of China Guangxi Key Laboratory of Earth Surface Processes and Intelligent Simulation(Guangxi Teachers Education University) GuangxiPeople’s Republic of China

There is a critical need to develop a means for fast,task-driven discovery of geospatial data found in *** geoportals,however,only provide metadata-based means for discovery,with little support for task-driven discovery,especially when considering spatial–temporal *** address this gap,this paper presents a Case-Based Reasoning-supported Geospatial Data Discovery(CBR-GDD)method and implementation that accesses geospatial data by *** advantages of the CBR-GDD approach is that it builds an analogue reasoning process that provides an internal mechanism bridging tasks and geospatial data with spatial–temporal awareness,thus providing solutions based on past *** CBR-GDD approach includes a set of algorithms that were successfully implemented via three components as an extension of geoportals:ontology-enhanced knowledge base,similarity assessment model,and case retrieval nets.A set of experiments and case studies validate the CBR-GDD approach and application,and demonstrate its efficiency.

关键词： Case-based reasoning geospatial data discovery ontology geoportals spatial–temporal awareness

Isogeometric Boundary Element Analysis for 2D Transient Heat Conduction Problem with Radial Integration Method

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

Computer Modeling in Engineering & Sciences 2021年第1期126卷 125-146页

作者： Leilei Chen Kunpeng Li xuan Peng Haojie lian Xiao Lin Zhuojia Fu College of Architecture and Civil Engineering Xinyang Normal UniversityXinyang464000China Department of Mechanical Engineering Suzhou University of Science and TechnologySuzhou215009China Key Laboratory of In-Situ Property-ImprovingMining of Ministry of Education Taiyuan University of TechnologyTaiyuan030024China Institute for Computational Engineering Faculty of ScienceTechnology and CommunicationUniversity of LuxembourgLuxembourg The York Management School University of YorkYorkYO105GDUK College of Mechanics andMaterials Hohai UniversityNanjing211100China

This paper presents an isogeometric boundary element method(IGABEM)for transient heat conduction *** Non-Uniform Rational B-spline(NURBS)basis functions,which are used to construct the geometry of the structures,are employed to discretize the physical unknowns in the boundary integral formulations of the governing *** extraction technique is employed to accelerate the evaluation of NURBS basis *** adopt a radial integration method to address the additional domain *** numerical examples demonstrate the advantage of IGABEM in dimension reduction and the seamless connection between CAD and numerical analysis.

关键词： Isogeometric analysis NURBS boundary element method heat conduction radial integration method