检索结果-南通市图书馆

Analytical Solutions for an Isotropic Elastic Half-Plane with Complete Surface Effects Subjected to a Concentrated/Uniform Surface Load

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2024年第3期37卷 371-384页

作者： xia-hui Pan School of Civil Engineering Henan Polytechnic UniversityJiaozuo454003China

Within the context of Gurtin-Murdoch surface elasticity theory,closed-form analytical solutions are derived for an isotropic elastic half-plane subjected to a concentrated/uniform surface *** the effects of residual surface stress and surface elasticity are *** stress function method and Fourier integral transform technique are *** solutions are provided in a compact manner that can easily reduce to special situations that take into account either one surface effect or none at *** results indicate that surface effects generally lower the stress levels and smooth the deformation profiles in the *** elasticity plays a dominant role in the in-plane elastic fields for a tangentially loaded half-plane,while the effect of residual surface stress is fundamentally crucial for the out-of-plane stress and displacement when the half-plane is normally *** the remaining situations,combined effects of surface elasticity and residual surface stress should be *** results for a concentrated surface force serve essentially as fundamental solutions of the Flamant and the half-plane Cerruti problems with surface *** solutions presented in this work may be helpful for understanding the contact behaviors between solids at the nanoscale.

关键词： Surface effects Residual surface stress Surface elasticity Half-plane Analytical solutions

高校专业课程思政建设和思政教学评价机制的设计与实践——以轻化工机械与设备课程为例

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

造纸技术与应用 2025年第1期53卷 46-50页

作者：张恒蓝惠霞青岛科技大学生物工程学院山东青岛266042 青岛科技大学环境与安全工程学院山东青岛266042

探讨了高校专业课程思政建设的理论基础、实践路径及其评价机制的设计与应用.通过对思政教育与专业课程融合的必要性进行分析,明确了课程思政的理论依据和实施价值.研究提出了多维度的思政教学评价指标体系,涵盖认知、情感和行为层面,... 详细信息

探讨了高校专业课程思政建设的理论基础、实践路径及其评价机制的设计与应用.通过对思政教育与专业课程融合的必要性进行分析,明确了课程思政的理论依据和实施价值.研究提出了多维度的思政教学评价指标体系,涵盖认知、情感和行为层面,旨在全面评估学生的思政学习效果.为增强思政教育的实效性和针对性,为高校思想政治教育的不断提高提供参考和借鉴,以轻化工机械与设备课程为例进行案例分析和实践探讨,提出了优化思政教学评价机制的具体策略.

关键词：思政教学设计评价机制反馈

Exploration and progress of high-energy supercapacitors and related electrode materials

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2015年第11期58卷 1851-1863页

作者： YANG Mei xia hui School of Materials Science and Engineering Nanjing University of Science and Technology Herbert Gleiter Institute of Nanoscience Nanjing University of Science and Technology

As one of new electrical energy storage systems, supercapacitors possess higher energy density than conventional capacitors and larger power density than batteries, integrating substantial merits with high energy, large power delivery, long cycle life, obvious safety, and low cost. However, the unsatisfying energy density is the inhabiting issue for the wide commercial applications. As the energy density(E, W h kg?1) is directly proportional to specific capacitance(C, F g?1) and the square of operating voltage(V, V), in this review, we summarize the recent progress in two sections: the exploration of high-performance electrode materials to achieve high specific capacitance and the construction of high-voltage supercapacitor systems for high working voltage. The progressive explorations and developments in supercapacitors could guide the future research towards high-performance, low-cost, and safe energy storage devices.

关键词： electrochemical capacitors high-energy supercapacitors electrode materials energy density energy storage systems

PE-EDD:An efficient peer-effect-based financial fraud detection approach in publicly traded China firms

在线全文

学校读者我要写书评

暂无评论

CAAI Transactions on Intelligence Technology 2022年第3期7卷 469-480页

作者： hui xia hui Ma Ping Cheng School of accounting Chongqing University of TechnologyChongqingChina Chongqing Rural Commercial Bank ChongqingChina

Financial fraud arises from the exaggeration of business interests,and an accurate detection or prediction is a useful tool for both corporate management and capital market systems.A collection of computer technologies has been made on this problem so far,and one of the most important solutions is unsupervised learning *** them,most approaches work by analysing the internal relations in financial data and finding a new description of non-fraud ***,current studies focus a lot on the geometry attribute of financial data,while overlooking the obvious behaviour patterns and peer effects among *** has limited the accuracy of representation and furthermore the detection *** this work,a very general class of functions is allowed to represent firms,constraining them by peer effects between firms and presenting an error-distribution-based financial fraud firm detection *** results have shown great performance of the proposed approach.

关键词： detection financial fraud NMF peer effect

Synthesis and application of bilayer-surfactant-enveloped Fe_3O_4 nanoparticles: water-based bilayer-surfactant-enveloped ferrofluids

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 Minerals,Metallurgy and Materials 2016年第2期23卷 234-240页

作者： Bai-yi Chen Jian-hui Qiu hui-xia Feng Department of Machine Intelligence and Systems Engineering Faculty of Systems Engineering Akita Prefectural University College of Petrochemical Technology Lanzhou University of Technology

Superparamagnetic carbon-coated Fe3O4 nanoparticles with high magnetization（85 emu·g-（-1）） and high crystallinity were synthesized using polyethylene glycol-4000（PEG（4000）） as a carbon ***3O4 water-based bilayer-surfactant-enveloped ferrofluids were subsequently prepared using sodium oleate and PEG（4000） as *** using X-ray photoelectron spectroscopy,X-ray diffraction,and Fourier-transform infrared spectroscopy indicate that the Fe3O4 nanoparticles with a bilayer surfactant coating retain the inverse spinel-type structure and are successfully coated with sodium oleate and PEG（4000）.Transmission electron microscopy,vibrating sample magnetometry,and particle-size analysis results indicate that the coated Fe3O4 nanoparticles also retain the good saturation magnetization of Fe3O4（79.6 emu·g^-1） and that the particle size of the bilayer-surfactant-enveloped Fe3O4 nanoparticles is 42.97 nm,which is substantially smaller than that of the unmodified Fe3O4 nanoparticles（486.2 nm）.UV-vis and zeta-potential analyses reveal that the ferrofluids does not agglomerate for 120 h at a concentration of 4 g·L^-1,which indicates that the ferrofluids are highly stable.

关键词： magnetic fluids iron oxides nanoparticles bilayers sodium oleate polyethylene glycol

Lagrangian Bonnet Problems in Complex Space Forms

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2019年第8期35卷 1357-1366页

作者： hui xia HE hui MA Er xiao WANG School of Mathematics and Systems Science Beihang University LIMB of the Ministry of Education Beijing 100083 P. R. China Department of Mathematical Sciences Tsinghua University Beijing 100084 P. R. China Department of Mathematics Hong Kong Univ of Sci. and Tech. Clear Water Bay Kowloon Hong Kong P. R. China

In this note we consider Lagrangian Bonnet problem for Lagrangian surfaces in complex space forms. We first give a Bonnet type theorem for conformal Lagrangian surfaces in complex space forms, then we show that any compact Lagrangian surface in the complex space form admits at most one other global isometric Lagrangian surface with the same mean curvature form, unless the Maslov form is conformal. These two Lagrangian surfaces are then called Lagrangian Bonnet pairs. We also studied Lagrangian Bonnet surfaces in complex space forms, and obtain some characterizations of such surfaces.

关键词： Lagrangian submanifolds complex space forms. Bonnet pairs

Electrochemical properties of MnO_(2)/CNT nanocomposite in neutral aqueous electrolyte as cathode material for asymmetric supercapacitors

在线全文

学校读者我要写书评

暂无评论

International Journal of Smart and Nano Materials 2011年第4期2卷 283-291页

作者： hui xia Chao Huo School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjingJiangsu 210094P.R.China National Institute of Metrology China Bei San Huan Dong Road 18Beijing 100013P.R.China

A MnO_(2)/carbon nanotube(CNT)nanocomposite was synthesised using a simple hydrothermal *** nanocomposite exhibits a CNT core/MnO_(2)porous sheath hierarchy architecture,which makes it promising as an electrode material for *** asymmetric supercapacitor based on activated carbon(AC)as anode,MnO_(2)/CNT nanocomposite as cathode and 1M Na_(2)SO_(4)solution as electrolyte was assembled in a Swagelok *** full cell exhibits excellent power capability,cycling stability and a high energy density of 23 W h/kg at a power density of 330 W/kg based on the total mass of the active electrode *** AC//MnO_(2)/CNT asymmetric supercapacitor is promising for high-power applications due to its high energy density and power density.

关键词： supercapacitor carbon nanotube nanocomposite

Adversarial attacks against dynamic graph neural networks via node injection

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

High-Confidence Computing 2024年第1期4卷 43-51页

作者： Yanan Jiang hui xia School of Computer Science and Technology Ocean University of ChinaQingdao 266100China

Dynamic graph neural networks(DGNNs)have demonstrated their extraordinary value in many practical ***,the vulnerability of DNNs is a serious hidden danger as a small disturbance added to the model can markedly reduce its *** the same time,current adversarial attack schemes are implemented on static graphs,and the variability of attack models prevents these schemes from transferring to dynamic *** this paper,we use the diffused attack of node injection to attack the DGNNs,and first propose the node injection attack based on structural fragility against DGNNs,named Structural Fragility-based Dynamic Graph Node Injection Attack(SFIA).SFIA firstly determines the target time based on the period ***,it introduces a structural fragile edge selection strategy to establish the target nodes set and link them with the malicious node using serial ***,an optimization function is designed to generate adversarial features for malicious *** on datasets from four different fields show that SFIA is significantly superior to many comparative *** the graph is injected with 1%of the original total number of nodes through SFIA,the link prediction Recall and MRR of the target DGNN link decrease by 17.4%and 14.3%respectively,and the accuracy of node classification decreases by 8.7%.

关键词： Dynamic graph neural network Adversarial attack Malicious node Vulnerability

Resonant Activation Induced by Four-Value Noise

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2008年第2期49卷 385-390页

作者： HAN Yin-xia LI Jing-hui P.O. Box 58 Faculty of Science Ningbo University Ningbo 315211 China

The phenomenon of the resonant activation （RA） of a particle over a fluctuating potential barrier with a four-value noise is investigated. It is shown that the mean first passage time （MFPT） displays six minima as the function of the transition rates γ1, γ2, γ3, γ4, γ5, and 76 of the four-value noise, respectively. In addition, the effect of other parameters of the system, such as the noise strength D of the additive Gaussian white noise and the parameter value a, b, c, and d of the four-value noise, on the RAs is also investigated.

关键词： resonant activation four-value noise mean first passage time