检索结果-南通市图书馆

Journal of Energy Chemistry 2025年第1期100卷 317-326页

作者： Binglu Deng jie shen Jinxing Lu Chuqiang Huang Zhuoyuan Chen Feng Peng Yunpeng Liu School of Materials Science and Hydrogen Energy Foshan University School of Chemistry and Chemical Engineering Guangzhou University Guangdong Key Laboratory for Hydrogen Energy Technologies

Seawater electrolysis is a promising approach for sustainable energy without relying on precious ***,the large-scale seawater electrolysis is hindered by low catalytic efficiency and severe anode corrosion caused by the harmful *** contrast to the oxygen evolution reaction （OER）and chlorin ion oxidation reaction （ClOR）,glycerol oxidation reaction （GOR） is more thermodynamically and kinetically favorable ***,a Ru doping cobalt phosphide （Ru-CoP2） is proposed as a robust bifunctional electrocatalyst for seawater electrolysis and GOR,for the concurrent productions of hydrogen and value-added *** in situ and ex situ characterization analyses demonstrated that Ru doping featured in the dynamic reconstruction process from Ru-CoP2to Ru-CoOOH,accounting for the superior GOR *** coupling GOR with hydrogen evolution was realized by employing Ru-CoP2as both anode and cathode,requiring only a low voltage of 1.43 V at 100 mA cm-2,which was 250 m V lower than that in alkaline *** work guides the design of bifunctional electrocatalysts for energy-efficient seawater electrolysis coupled with biomass resource upcycling.

关键词： Glycerol electrooxidation Hydrogen evolution Ru doping Cobalt phosphide Bifunctional electrocatalysts

Research on the Algorithm of Avionic Device Fault Diagnosis Based on Fuzzy Expert System

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2007年第3期20卷 223-229页

作者： LI jie shen Shi-tuan School of Electronics and Information Engineering Beijing University of Aeronautics and Astronautics Beijing 100083 China

Based on the fuzzy expert system fault diagnosis theory, the knowledge base architecture and inference engine algorithm are put forward for avionic device fault diagnosis. The knowledge base is constructed by fault query network, of which the basic ele- ment is the test-diagnosis fault unit. Every underlying fault cause＇s membership degree is calculated using fuzzy product inference algorithm, and the fault answer best selection algorithm is developed, to which the deep knowledge is applied. Using some examples the proposed algorithm is analyzed for its capability of synthesis diagnosis and its improvement compared to greater membership degree first principle.

关键词： fuzzy expert system fault query network fault answer best selection algorithm fuzzy theory test-diagnosis fault unit

Simultaneously enhancing the hot workability and room-temperature strength of Ti-6Al-4V alloy via adding Mo and Fe

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2024年第13期180卷 32-44页

作者： jie shen Zhihao Zhang Jianxin Xie Beijing Laboratory of Metallic Materials and Processing for Modern Transportation Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Key Laboratory for Advanced Materials Processing(MOE) University of Science and Technology BeijingBeijing 100083China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China

Reducing the hot working temperature and high-temperature deformation resistance of titanium alloy to improve hot rolling and hot extrusion workability of products with thin walls and complex section shapes has always been an important topic in the field of titanium alloy *** paper proposed a strategy of adding Mo and Fe elements to simultaneously reduce the hot working temperature and high-temperature deformation resistance of Ti-6Al-4V *** effects of Mo and Fe contents on the mi-crostructure,β transus temperature(Tp),and high-temperature flow stress(HFS)of Ti-6Al-4V-xMo-xFe(x=0-5)alloys were *** results showed that adding Mo and Fe can substantially reduce the Tp and HFS of the alloy,and greatly improve its room-temperature *** with com-mercial Ti-6Al-4V samples,the T_(β) of Ti-6Al-4V-2Mo-2Fe and Ti-6Al-4V-3Mo-3Fe samples was decreased by 68-98 ℃,and the HFS at 800-900 ℃ was decreased by 37.8%-46.0%.Compared with hot-rolled Ti-6Al-4V samples,the room-temperature tensile strength of hot-rolled Ti-6Al-4V-2Mo-2Fe samples was increased by about 30%,while the elongation hardly *** increased strength was mainly at-tributed to fine grain strengthening and solid solution *** hot workability and room-temperature strength of Ti-6Al-4V alloy can be significantly improved by adding 2-3 wt.%Mo and Fe simultaneously.

关键词： Titanium alloy High-temperature flow stress Hot workability Room-temperature strength

Energy Stable Schemes for Cahn-Hilliard Phase-Field Model of Two-Phase Incompressible Flows

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

Chinese Annals of Mathematics,Series B 2010年第5期31卷 743-758页

作者： jie shen Xiaofeng YANG Department of Mathematics Purdue University West Lafayette IN 47907 USA. Department of Mathematics University of South Carolina Columbia SC 29208 USA.

Numerical approximations of Cahn-Hilliard phase-field model for the two-phase incompressible flows are considered in this *** efficient and energy stable time discretization schemes for the coupled nonlinear Cahn-Hilliard phase-field system for both the matched density case and the variable density case are constructed,and are shown to satisfy discrete energy laws which are analogous to the continuous energy laws.

关键词： Phase-field Two-phase flow Navier-Stokes Cahn-Hilliard Energy stable

Increased Preoperative Glucose Variability Is Associated with Adverse Perioperative Outcomes Following Orthopedic Surgery in Patients with Type 2 Diabetes Mellitus

在线全文

学校读者我要写书评

暂无评论

Current Medical Science 2020年第3期40卷 523-529页

作者： Si-jie YUAN jie shen Department of Endocrinology and Metabolic Diseases The Third Affiliated HospitalSouthern Medical UniversityGuangzhou510630China

The association between glucose variability(GV)and adverse perioperative outcomes in type 2 diabetes mellitus(T2DM)patients undergoing orthopedic surgery was investigated.A retrospective cohort study was performed by analyzing data on T2DM patients receiving continuous blood glucose(BG)monitoring and continuous subcutaneous insulin infusion treatment due to poorly controlled preoperative BG prior to orthopedic *** was assessed with coefficient of variation(CV).Postoperative and perioperative CV,hypoglycemia cases,and other perioperative outcomes(diabetes preparation time[DPT],length of stay[LOS],and perioperative and infective complication cases)were *** showed that a total of 168 patients were grouped into preoperative CV tertiles:1st(n=56):0–0.2921,2nd(n=58):0.2922–0.3779,and 3rd(n=54):0.3780–*** blood glucose(FBG),perioperative CV,rate of hypoglycemia cases(OR:5.53,95%CI:2.43–12.59)(all P<0.001)and DPT(P=0.024)were higher in the 3rd than in the 1st *** adjustments of covariates,regression analysis indicated that the 3rd tertile was associated with increased perioperative CV(adjusted coefficient=0.515,P<0.001),DPT(adjusted coefficient=0.169,P=0.073),rate of hypoglycemia cases(OR:6.72,95%CI:2.69−16.82,P<0.001)and perioperative complication cases(OR:2.50,95%CI:0.90−7.01,P=0.080).In conclusion,preoperative GV is associated with increased perioperative GV and adverse perioperative outcomes including longer DPT and higher rates of hypoglycemia and perioperative complications.

关键词： glycemic variability orthopedics perioperative period type 2 diabetes mellitus

Intra-layer synchronization in duplex networks

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

Chinese Physics B 2018年第10期27卷 245-251页

作者： jie shen Longkun Tang Fujian Province University Key Laboratory of Computation Science School of Mathematical SciencesHuaqiao UniversityQuanzhou 362021China Department of Mathematics ＆ Statistics Georgia State UniversityAtlanta 30303USA

This paper explores the intra-layer synchronization in duplex networks with different topologies within layers and different inner coupling patterns between, within, and across layers. Based on the Lyapunov stability method, we prove theoretically that the duplex network can achieve intra-layer synchronization under some appropriate conditions, and give the thresholds of coupling strength within layers for different types of inner coupling matrices across layers. Interestingly,for a certain class of coupling matrices across layers, it needs larger coupling strength within layers to ensure the intra-layer synchronization when the coupling strength across layers become larger, intuitively opposing the fact that the intra-layer synchronization is seemly independent of the coupling strength across layers. Finally, numerical simulations further verify the theoretical results.

关键词： multi-layer network intra-layer synchronization Lyapunov stability method

Efficient linear and unconditionally energy stable schemes for the modified phase field crystal equation

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2022年第10期65卷 2201-2218页

作者： Xiaoli Li jie shen School of Mathematics Shandong UniversityJinan 250100China Department of Mathematics Purdue UniversityWest LafayetteIN 47907USA

In this paper,we construct efficient schemes based on the scalar auxiliary variable block-centered finite difference method for the modified phase field crystal equation,which is a sixth-order nonlinear damped wave *** schemes are linear,conserve mass and unconditionally dissipate a pseudo *** prove rigorously second-order error estimates in both time and space for the phase field variable in discrete *** also present some numerical experiments to verify our theoretical results and demonstrate the robustness and accuracy.

关键词： modified phase field crystal scalar auxiliary variable energy stability error estimate numerical experiments

Efficient splitting schemes for magneto-hydrodynamic equations

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2016年第8期59卷 1495-1510页

作者： CHOI Heejun shen jie Department of Mathematics Purdue University

We present in this paper several efficient numerical schemes for the magneto-hydrodynamic(MHD)equations. These semi-discretized(in time) schemes are based on the standard and rotational pressure-correction schemes for the Navier-Stokes equations and do not involve a projection step for the magnetic field. We show that these schemes are unconditionally energy stable, present an effective algorithm for their fully discrete versions and carry out demonstrative numerical experiments.

关键词： magneto-hydrodynamic (MHD) incompressible stability error analysis spectral method

Operators with the Lipschitz bounded approximation property

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2023年第7期66卷 1545-1554页

作者： Rui Liu jie shen Bentuo Zheng School of Mathematical Sciences and LPMC Nankai UniversityTianjin 300071China Department of Mathematics The University of MemphisMemphisTN 38152USA

We show that if a bounded linear operator can be approximated by a net(or sequence)of uniformly bounded finite rank Lipschitz mappings pointwisely,then it can be approximated by a net(or sequence)of uniformly bounded finite rank linear operators under the strong operator *** an application,we deduce that a Banach space has an(unconditional)Lipschitz frame if and only if it has an(unconditional)Schauder *** immediate consequence of our result recovers the famous Godefroy-Kalton theorem(Godefroy and Kalton(2003))which says that the Lipschitz bounded approximation property and the bounded approximation property are equivalent for every Banach space.

关键词： bounded approximation property Lipschitz bounded approximation property Lipschitz frame

同方期刊数据库

An Efficient Spectral Method for Acoustic Scattering from Rough Surfaces

在线全文

学校读者我要写书评

暂无评论

Communications in Computational Physics 2007年第1期2卷 54-72页

作者： Dongbin Xiu jie shen Department of Mathematics Purdue UniversityWest LafayetteIN 47907USA.

An efficient and accurate spectral method is presented for scattering problems with rough surfaces.A probabilistic framework is adopted by modeling the surface roughness as random *** improved boundary perturbation technique is employed to transform the original Helmholtz equation in a random domain into a stochastic Helmholtz equation in a fixed *** generalized polynomial chaos(gPC)is then used to discretize the random space;and a Fourier-Legendre method to discretize the physical *** result in a highly efficient and accurate spectral algorithm for acoustic scattering from rough *** examples are presented to illustrate the accuracy and efficiency of the present algorithm.

关键词： Acoustic scattering spectral methods,stochastic inputs,differential equations,uncertainty quantification.