检索结果-南通市图书馆

P-and SV-wave dispersion and attenuation in saturated microcracked porous rock with aligned penny-shaped fractures

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2024年第1期21卷 143-161页

作者： sheng-Qing Li Wen-Hao Wang Yuan-Da Su Jun-xin guo Xiao-Ming Tang School of Geosciences China University of Petroleum(East China)Qingdao 266580ShandongChina Laoshan National Laboratory Qingdao 266071ShangdongChina Guangdong Provincial Key Laboratory of Geophysical High-resolution Imaging Technology Southern University of Science and TechnologyShenzhen 518055GuangdongChina Department of Earth and Space Sciences Southern University of Science and TechnologyShenzhen 518055GuangdongChina

P-and SV-wave dispersion and attenuation have been extensively investigated in saturated poroelastic media with aligned ***,there are few existing models that incorporate the multiple wave attenuation mechanisms from the microscopic scale to the macroscopic ***,in this work,we developed a unified model to incorporate the wave attenuation mechanisms at different scales,which includes the microscopic squirt flow between the microcracks and pores,the mesoscopic wave-induced fluid flow between fractures and background(FB-WIFF),and the macroscopic Biot's global flow and elastic scattering(ES)from the *** Tang's modified Biot's theory and the mixed-boundary conditions,we derived the exact frequency-dependent solutions of the scattering problem for a single penny-shaped fracture with oblique incident P-and *** then developed theoretical models for a set of aligned fractures and randomly oriented fractures using the Foldy *** results indicated that microcrack squirt flow considerably influences the dispersion and attenuation of P-and SV-wave *** coupling effects of microcrack squirt flow with the FB-WIFF and ES of fractures cause much higher velocity dispersion and attenuation for P waves than for SV *** oriented fractures substantially reduce the attenuation caused by the FB-WIFF and ES,particularly for the ES attenuation of SV *** a comparison with existing models in the limiting cases and previous experimental measurements,we validated our model.

关键词： Aligned fractures P-and SV-wave Dispersion and attenuation Microcracked porous background FB-WIFF Elastic scattering Squirt flow

红细胞免疫黏附调节因子对焦虑症诊断及疗效的预测价值

在线全文

学校读者我要写书评

暂无评论

临床心身疾病杂志 2024年第2期30卷 1-6页

作者：王贵贤王慧颖陈永新郭新胜杨焦峰新乡医学院第二附属医院河南新乡453002

目的探讨焦虑症患者红细胞免疫黏附调节因子表达及其对临床疗效的预测价值。方法选取180例焦虑症患者设为观察组,180名健康志愿者设为对照组。两组受试者均进行红细胞免疫黏附调节因子检测,比较两组检测结果。同时比较不同疗效患者红... 详细信息

目的探讨焦虑症患者红细胞免疫黏附调节因子表达及其对临床疗效的预测价值。方法选取180例焦虑症患者设为观察组,180名健康志愿者设为对照组。两组受试者均进行红细胞免疫黏附调节因子检测,比较两组检测结果。同时比较不同疗效患者红细胞免疫黏附调节因子水平。绘制受试者工作特征(ROC)曲线分析红细胞免疫黏附调节因子对焦虑症诊断价值及对临床疗效的预测价值。结果观察组受试者红细胞免疫抑制因子、免疫黏附促因子、循环免疫复合物、β-内啡肽水平及红细胞-免疫复合植物花环率均高于对照组,酵母花环率低于对照组(P<0.01)。ROC曲线分析显示,6种红细胞免疫黏附调节因子诊断焦虑症的曲线下面积(AUC)分别为0.770、0.747、0.698、0.729、0.722、0.863,6项指标联合诊断焦虑症的AUC为0.991,高于单项诊断效能(Z=4.266、4.760、5.742、4.106、4.022、4.464,P<0.05或0.01)。180例患者中,疗效良好144例,疗效较差36例;疗效良好患者5种红细胞免疫黏附调节因子水平均低于疗效较差患者,酵母花环率高于疗效较差患者,差异有统计学意义(P<0.01)。6种红细胞免疫黏附调节因子预测焦虑症治疗无效的AUC分别为0.786、0.845、0.777、0.866、0.745、0.902,6项指标联合预测焦虑症治疗无效的AUC为0.990,高于单项预测效能(Z=2.880、2.286、3.049、2.662、3.049、2.182,P<0.01)。结论焦虑症患者红细胞免疫黏附调节因子表达异常,且与预后关系密切,检测该指标能为焦虑症诊断和临床疗效评估提供科学依据。

关键词：红细胞免疫黏附调节因子焦虑症表达疗效

All-fluorinated electrolyte for non-flammable batteries with ultra-high specific capacity at 4.7 V

在线全文

学校读者我要写书评

暂无评论

Green Energy & Environment 2024年第10期9卷 1601-1609页

作者： Zhe Wang Zhuo Li Jialong Fu sheng Zheng Rui Yu Xiaoyan Zhou Guanjie He xin guo State Key Laboratory of Material Processing and Die&Mould Technology Laboratory of Solid State IonicsSchool of Materials Science and EngineeringHuazhong University of Science and Technology Electrochemical Innovation Lab Department of Chemical EngineeringUniversity College London

Li metal batteries （LMBs） with Li Ni0.8Mn0.1Co0.1O2（NMC811） cathodes could release a specific energy of >500 Wh kg-1by increasing the charge ***,high-nickel cathodes working at high voltages accelerate degradations in bulk and at interfaces,thus significantly degrading the cycling lifespan and decreasing the specific ***,we rationally design an all-fluorinated electrolyte with addictive tri（2,2,2-trifluoroethyl） borate （TFEB）,based on 3,3,3-fluoroethylmethylcarbonate （FEMC） and fluoroethylene carbonate （FEC）,which enables stable cycling of high nickel cathode (Li Ni0.8Co0.1Mn0.1O2,NMC811) under a cut-off voltage of 4.7 V in Li metal *** electrolyte not only shows the fire-extinguishing properties,but also inhibits the transition metal dissolution,the gas production,side reactions on the cathode ***,the NMC811||Li cell demonstrates excellent performance by using limited Li and high-loading cathode,delivering a specific capacity>220 m A h g-1,an average Coulombic efficiency >99.6% and capacity retention >99.7% over 100 cycles.

关键词： Fluorinated electrolyte Li metal batteries Solid electrolyte interphase Cathode electrolyte interphase Coulombic efficiency

Highly Transparent Fire-resistant Coatings with Intumescent Three-source Integration

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 Polymer Science 2024年第7期42卷 907-915,I0005页

作者： Xiao-Liang Zeng xin-sheng Lan Yan Wang Lin Zhang De-Ming guo Hai-Bo Zhao State Grid Sichuan Electric Power Research Institute Chengdu610041China The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials(Ministry of Education) National Engineering Laboratory of Eco-Friendly Polymeric Materials(Sichuan)State Key Laboratory of Polymer Materials EngineeringCollege of ChemistrySichuan UniversityChengdu610064China

Wood,a readily available and sustainable natural resource,has found widespread use in construction and ***,its inherent flammability poses a potential fire *** intumescent fire-retardant coatings effectively mitigate this risk,achieving high transparency in such coatings presents a significant *** our approach,we employed a cross-linked network of phytic acid anion and N-[3-(trimethoxysilyl)propyl]-N,N,N-trimethylammonium cation to create a transparent"three-in-one"intumescent *** collaborative P/N/Si flame-retardant effect markedly improved the intumescent char-forming capability,preventing the wood from rapid *** resulted in a substantial reduction in heat release(13.9%decrease in THR)and an increased limiting oxygen index(LOI)value of 35.5%.Crucially,the high transparency of the coating ensured minimal impact on the wood's appearance,allowing the natural wood grains to remain clearly *** innovative approach provides a straightforward method for developing transparent intumescent flame-retardant coatings suitable for wooden *** potential applications extend to preserving ancient buildings and heritage conservation efforts.

关键词： Fire-resistant coating Flame retardancy Wood Transparency

Salp Swarm Incorporated Adaptive Dwarf Mongoose Optimizer with Lévy Flight and Gbest-Guided Strategy

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2024年第4期21卷 2110-2144页

作者： Gang Hu Yuxuan guo Guanglei sheng Department of Applied Mathematics Xi’an University of TechnologyXi’an710054People’s Republic of China School of Computer Science and Engineering Xi’an University of TechnologyXi’an710048People’s Republic of China Department of Electronics and Information Engineering Bozhou UniversityBozhou236800People’s Republic of China

In response to the shortcomings of Dwarf Mongoose Optimization(DMO)algorithm,such as insufficient exploitation capability and slow convergence speed,this paper proposes a multi-strategy enhanced DMO,referred to as ***,we propose an improved solution search equation that utilizes the Gbest-guided strategy with different parameters to achieve a trade-off between exploration and exploitation(EE).Secondly,the Lévy flight is introduced to increase the diversity of population distribution and avoid the algorithm getting stuck in a local *** addition,in order to address the problem of low convergence efficiency of DMO,this study uses the strong nonlinear convergence factor Sigmaid function as the moving step size parameter of the mongoose during collective activities,and combines the strategy of the salp swarm leader with the mongoose for cooperative optimization,which enhances the search efficiency of agents and accelerating the convergence of the algorithm to the global optimal solution(Gbest).Subsequently,the superiority of GLSDMO is verified on CEC2017 and CEC2019,and the optimization effect of GLSDMO is analyzed in *** results show that GLSDMO is significantly superior to the compared algorithms in solution quality,robustness and global convergence rate on most test ***,the optimization performance of GLSDMO is verified on three classic engineering examples and one truss topology optimization *** simulation results show that GLSDMO achieves optimal costs on these real-world engineering problems.

关键词： Dwarf mongoose optimization algorithm Gbest-guided Lévy flight Adaptive parameter Salp swarm algorithm Engineering optimization Truss topological optimization

Recent progress of Pt-based oxygen reduction reaction catalysts for proton exchange membrane fuel cells

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

Rare Metals 2024年第6期43卷 2444-2468页

作者： Feng Zhan Kun-Song Hu Jin-Hua Mai Li-sheng Zhang Zhen-guo Zhang Huan He xin-Hua Liu School of Resources Environment and MaterialsGuangxi UniversityNanning530004China School of Transportation Science and Engineering Beihang UniversityBeijing 102206China IDTECH(Suzhou)Co.Ltd Suzhou 215217China Dyson School of Design Engineering Imperial College LondonLondon SW72AZUK

With the increasing consumption of fossil fuels,proton exchange membrane fuel cells(PEMFCs)have attracted considerable attention as green and sustainable energy conversion *** slow kinetics of the cathodic oxygen reduction reaction(ORR)has a major impact on the performance of PEMFCs,and although platinum(Pt)can accelerate the reaction rate of the ORR,the scarcity and high cost of Pt resources still limit the development of ***,the development of low-cost high-performance ORR catalysts is essential for the commercial application and development of *** paper reviews the research progress of researchers on Pt-based ORR catalysts in recent years,including Pt/C catalysts,Pt-based alloy catalysts,Pt-based intermetallic compounds,and Pt-based single-atom catalysts(SACs),with a focus on Pt-based alloy catalysts with different *** described in detail the difficulties and solutions in the research process of various ORR catalysts and explained the principle of their activity enhancement with density functional theory(DFT).In addition,an outlook on the development of Pt-based catalysts is given,and reducing the amount of Pt used and improving the performance of catalysts are the directions to work on in the coming period.

关键词： Pt-based catalysts PEMFCs Pt-based intermetallic compounds Single-atom catalysts

Configuration Synthesis and Grasping Performance Analysis of Multi-Loop Coupling Capture Mechanism for Launch and Recovery of Torpedo-Shaped Autonomous Underwater Vehicle

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2024年第3期38卷 453-466页

作者： ZHANG guo-xing XIA xin-lu guo Jin-wei School of Mechanical Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China

Research of capture mechanisms with strong capture adaptability and stable grasp is important to solve the problem of launch and recovery of torpedo-shaped autonomous underwater vehicles(AUVs).A multi-loop coupling capture mechanism with strong adaptability and high retraction rate has been proposed for the launch and recovery of torpedo-shaped AUVs with different morphological ***,the principle of capturing motion retraction is described based on the appearance characteristics of torpedo-shaped AUVs,and the configuration synthesis of the capture mechanism is carried out using the method of constrained chain ***,the screw theory is employed to analyze the degree of freedom(DoF)of the capture ***,the 3D model of the capture mechanism is established,and the kinematics and dynamics simulations are carried *** with the capture orientation requirements of the capture mechanism,the statics and vibration characteristics analyses are carried ***,considering the capture process and the underwater working environment,the motion characteristics and hydraulics characteristics of the capture mechanism are ***,a principle prototype is developed and the torpedo-shaped AUVs capture experiment is *** work provides technical reserves for the research and development of AUV capture special equipment.

关键词： capture mechanism torpedo-shaped AUVs configuration synthesis launch and recovery grasping performance analysis

Restraining growth of Zn dendrites by poly dimethyl diallyl ammonium cations in aqueous electrolytes

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第8期43卷 3735-3747页

作者： Xiang-xin Zhang Yuan-Qiang Chen Chang-xin Lin Yuan-sheng Lin guo-Lin Hu Yong-Chuan Liu Xi-Lai Xue Su-Jing Chen Zhan-Lin Yang Bai-sheng Sa Yi-Ning Zhang Key Laboratory of Optoelectronic Materials Chemistry and Physics Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Helmholtz Institute Ulm(HIU) 89081 UlmGermany Karlsruhe Institute of Technology(KIT) 76021 KarlsruheGermany College of Materials Science and Engineering Fuzhou UniversityFuzhou350108China

Metallic zinc is an excellent anode material for Zn-ion batteries,but the growth of Zn dendrite severely hinders its practical ***,an efficient and economical cationic additive,poly dimethyl diallyl ammonium(PDDA) was reported,used in aqueous Zn-ion batteries electrolyte for stabilizing Zn *** growth of zinc dendrites can be significantly restrained by benefiting from the pronounced electrostatic shielding effect from PDDA on the Zn metal ***,the PDDA is preferentially absorbed on Zn(002) plane,thus preventing unwanted side reactions on Zn *** to the introduction of a certain amount of PDDA additive into the common ZnSO_(4)-based electrolyte,the cycle life of assembled Zn‖Zn cells(1 mA·cm^(-2) and 1 mAh·cm^(-2)) is prolonged to more than 1100 *** response to the perforation issue of Zn electrodes caused by PDDA additives,the problem can be solved by combining foamy copper with zinc *** real application,Zn-ion hybrid supercapacitors and MnO_(2)‖Zn cells were assembled,which exhibited excellent cycling stability with PDDA *** work provides a new solution and perspective to cope with the dendrite growth problem of Zn anode.

关键词： PDDA Electrostatic shielding effect Zn anode Zn dendrites

Composition operators on weighted Bergman spaces induced by doubling weights

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2024年第7期67卷 1571-1598页

作者： xin guo Maofa Wang School of Mathematics and Statistics Wuhan UniversityWuhan430072China

Given a doubling weightωon the unit disk D,let A_(ω)^(p) be the space of all the holomorphic functions f,where∥f∥A_(ω)^(p):=(∫_(D)|f(z)|_(p)ω(z)dA(z))^(1/p)<∞.We completely characterize the topological connectedness of the set of composition operators on A_(ω)^(p).As an application,we construct an interesting example which reveals that two composition operators on A_(α)^(p) in the same path component may fail to have a compact difference and give a negative answer to the Shapiro-Sundberg question in the(standard)weighted Bergman *** addition,we completely describe the central compactness of any finite linear combinations of composition operators on A_(ω)^(p) in three terms:a Julia-Carathéodory-type function-theoretic characterization,a power-type characterization,and a Carleson-type measure-theoretic characterization.

关键词： composition operator linear combination linearly connected weighted Bergman space doubling weight