检索结果-南通市图书馆

Graphene Aerogel Composites with Self‑Organized Nanowires‑Packed Honeycomb Structure for Highly Efficient Electromagnetic Wave Absorption

引用

Nano-Micro Letters 2025年第2期17卷 533-547页

作者： Xiao You Huiying Ouyang Ruixiang Deng Qiuqi Zhang Zhenzhong Xing Xiaowu Chen Qingliang Shan Jinshan Yang Shaoming Dong State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050People’s Republic of China Key Laboratory of Inorganic Coating Materials CAS Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050People’s Republic of China Structural Ceramics and Composites Engineering Research Center Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050People’s Republic of China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049People’s Republic of China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210People’s Republic of China School of Materials Science and Engineering Zhejiang Sci-Tech UniversityHangzhou 310018People’s Republic of China university of Chinese Academy of Sciences Beijing 100039People’s Republic of China

With vigorous developments in nanotechnology,the elaborate regulation of microstructure shows attractive potential in the design of electromagnetic wave ***,a hierarchical porous structure and composite heterogeneous interface are constructed successfully to optimize the electromagnetic loss *** macro–micro-synergistic graphene aerogel formed by the ice template‑assisted 3D printing strategy is cut by silicon carbide nanowires(SiC_(nws))grown in situ,while boron nitride(BN)interfacial structure is introduced on graphene *** unique composite structure forces multiple scattering of incident EMWs,ensuring the combined effects of interfacial polarization,conduction networks,and magnetic-dielectric ***,the as-prepared composites present a minimum reflection loss value of−37.8 dB and a wide effective absorption bandwidth(EAB)of 9.2 GHz(from 8.8 to 18.0 GHz)at 2.5 ***,relying on the intrinsic high-temperature resistance of SiC_(nws) and BN,the EAB also remains above 5.0 GHz after annealing in air environment at 600℃ for 10 h.

关键词： Hierarchical porous structure Interface High-temperature resistance Graphene aerogel composites Electromagnetic wave absorption

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Dynamics of optical rogue waves in inhomogeneous nonlinear waveguides

引用

Chinese Physics B 2013年第5期22卷 330-334页

作者：张解放金美贞何纪达楼吉辉戴朝卿 zhejiang university of Media and Communications Institute of Nonlinear Physics Zhejiang Normal University School of Sciences Zhejiang Agriculture and Forestry University

We propose a unified theory to construct exact rogue wave solutions of the （2＋1）-dimensional nonlinear Schr6dinger equation with varying coefficients. And then the dynamics of the first- and the second-order optical rogues are investigated. Finally, the controllability of the optical rogue propagating in inhomogeneous nonlinear waveguides is discussed. By properly choosing the distributed coefficients, we demonstrate analytically that rogue waves can be restrained or even be annihilated, or emerge periodically and sustain forever. We also figure out the center-of-mass motion of the rogue waves.

关键词： rogue wave (2+ 1)-dimensional nonlinear Schrodinger equation inhomogeneous nonlinear waveg-uides

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Investigation of the dynamic characteristics of a dual rotor system and its start-up simulation based on finite element method

引用

Journal of zhejiang university-Science A(Applied Physics & Engineering) 2013年第4期14卷 268-280页

作者： Zhong-xiu FEI Shui-guang TONG Chao WEI Institute of Chemical Machinery Engineering Zhejiang University Mechanical Design Institute Zhejiang University Institute of Thermal Engineering and Power Systems Zhejiang University

Recently,the finite element method(FEM) has been commonly applied in the engineering analysis of rotor *** moments,rotary inertia,transverse shear deformation and gravity can be included in computational models of rotor-bearing *** this paper,a finite element model and its solution method are presented for the calculation of the dynamics of dual rotor systems.A typical structure with two rotor shafts is discussed and the procedure for obtaining the coupling motion equations of the subsystems is illustrated.A computer program is developed to solve critical speeds and to simulate the transient *** influence of gyroscopic moments on co-rotation and counter-rotation is analyzed,and the effect of the speed ratio on critical speed is *** dynamic characteristics under different conditions of increasing speed during start-up are demonstrated by comparison with transient nodal *** presented model provides a complete foundation for further investigation of the dynamics of dual rotor systems.

关键词： Dual rotor system Critical speed Transient response Finite element method(FEM)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Design, Synthesis and Pregnancy-Terminating Activity of 2-Aryl Imidazo[2,1-a]isoquinolines

引用

Chinese Journal of Chemistry 2004年第3期22卷 315-320页

作者：商志才胡桂香吴天星方瑞英俞庆森 Department of Chemistry Zhejiang University Hangzhou Zhejiang 310027 China Ningbo Institute of Technology Zhejiang University Ningbo Zhejiang 315104 China Department of Pharmacology Zhejiang University Hangzhou Zhejiang 310031 China

In order to clarify the structural requirement of pregnancy-terminating drugs, the quantitative structure-activity relationship (QSAR) of 2-aryl imidazo[2,1-a]isoquinolines was studied on the basis of quantum mechanical calculation and multiple regression analysis. A Good correlation equation was obtained (r2=0.925, q2=0.871). Some new compounds were designed according to the equation. Two of them, compounds 21 and 22, were synthesized and evaluated in NIH mice. The results showed that the difference of activity between 21 (median effective dose ED50=0.943 mg/kg/day) and 22 (ED50=1.099 mg/kg/day) was small and both of them were potent. It is also agreed with the computational results. Compared with L14105 which is the most potent pregnancy-terminating agent, these two compounds possess high activity. The evaluation of the anti-implanting activity showed that they were 100% effective at tested dosage 50.0, 25.0, 12.5 mg/kg/day×3 days in oral administration, which proved the both of them had anti-implanting activity and low first-pass effects.

关键词： 2-aryl imidazo[2,1-a]isoquinolines quantitative structure-activity relationship (QSAR) pregnancy- terminating activity anti-implanting first-pass effect

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Application of samarium reagents in organic synthesis

引用

Chinese Journal of Chemistry 1999年第1期17卷 4-15,1页

作者：余明新张永敏包伟良 Department of Chemistry Zhejiang University Hangzhou Zhejiang 310028 China

Application of samarium diiodide, samarium triiodide, Sm0/auxiliary system and organosamarium reagents in organic synthesis was reviewed.

关键词： Samarium reagents synthetic applications

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Adjusting the local solvation structures and hydrogen bonding networks for stable aqueous batteries with reduced cost

引用

Journal of Energy Chemistry 2022年第5期31卷 411-419页

作者： Canfu Zhang Binbin Chen Haoran Cai Renzhi Huang Yingchun Liu Huilin Pan Department of Chemistry Zhejiang UniversityHangzhou 310027ZhejiangChina

Exploring low-cost and effective approaches to extend the potentials of aqueous electrolytes is highly ***,it is found that the activity of H_(2)O in aqueous electrolytes could be intensively manipulated by introducing small urea and long-chain polyethylene glycol(PEG)molecules into Li TFSI-H_(2)O electrolyte systems without super salt *** urea and PEG molecules could exclude partial coordinated H_(2)O out of the inner solvation shell of Li_(4) and reconstruct hydrogen-bonding network between H_(2)O and PEG molecules outside the solvation sheaths with restricted H_(2)O activity and extended electrochemical *** bonding competitions in aqueous electrolytes and their correlation to the electrochemical performance of full cells are *** the occurrence probability of H_(2)O around Li_(4)is lower than 40%,stable cycling of 3.1 V LiMn_(2)O_(4)-Li_(4)Ti_(5)O_(12) full cell is achieved,showing 73%capacity retention after 200 cycles at 1 C rate in optimal *** work provides new avenues to understand the role of H_(2)O and explore low-cost and effective approaches for the development of nextgeneration aqueous lithium-ion batteries.

关键词： Solvation sheath H_(2)O activity Aqueous electrolytes Lithium-ion batteries

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Kinematic modeling and control of a novel pneumatic soft robotic arm

引用

Chinese Journal of Aeronautics 2022年第7期35卷 310-319页

作者： Hongwei LI Yan XU Chao ZHANG Huxiao YANG School of Aeronautics and Astronautics Zhejiang UniversityHangzhouZhejiangChina

A novel soft robotic arm(SRA)composed of two soft extensible arms(SEAs)and a soft bendable joint(SBJ)for space capture systems is presented in this paper.A diamond origami pattern was applied in the design of the SEAs,and large deformations of the SEAs in positive pressure were simulated using the nonlinear finite element method.A kinematic model of the SRA using the Denavit–Hartenberg method based on the assumption of constant curvatures was proposed.A closed-loop model-free control system based on a PID controller was developed using real-time data from a vision sensor *** kinematic model and closed-loop model-free control system are experimentally evaluated on an SRA prototype by four *** experimental results demonstrate that the derived kinematic model can finely describe the movement of the SRA and that the closed-loop control system can control the SRA to reach the desired destination or trajectory within an acceptable error and performs well in long-term repeated operations.

关键词： Arm control Kinematics Repeated precision Soft robotic arm Trajectory tracking

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A method of shadow puppet figure modeling and animation

引用

Frontiers of Information Technology & Electronic Engineering 2015年第5期16卷 367-379页

作者： Xiao-fang HUANG Shou-qian SUN Ke-jun ZHANG Tian-ning XU Jian-feng WU Bin ZHU College of Computer Science and Technology Zhejiang University School of Art Zhejiang University of Technology College of Information Science and Technology Zhejiang Shuren University

To promote the development of the intangible cultural heritage of the world, shadow play, many studies have focused on shadow puppet modeling and interaction. Most of the shadow puppet figures are still imaginary,spread by ancients, or carved and painted by shadow puppet artists, without consideration of real dimensions or the appearance of human bodies. This study proposes an algorithm to transform 3D human models to 2D puppet figures for shadow puppets, including automatic location of feature points, automatic segmentation of 3D models, automatic extraction of 2D contours, automatic clothes matching, and animation. Experiment proves that more realistic and attractive figures and animations of the shadow puppet can be generated in real time with this algorithm.

关键词： Shadow play Shadow puppet figure 3D human body Data processing 2D modeling

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Novel structural designs of 3D-printed osteogenic graft for rapid angiogenesis

引用

Bio-Design and Manufacturing 2023年第1期6卷 51-73页

作者： Weiying Lu Yang Shi Zhijian Xie Stomatology Hospital School of StomatologyZhejiang University School of MedicineZhejiang UniversityHangzhou 310006China Key Laboratory of Oral Biomedical Research of zhejiang Province Zhejiang UniversityHangzhou 310006China Cancer Center Zhejiang UniversityHangzhou 310006China zhejiang Provincial Clinical Research Center for Oral Diseases Zhejiang UniversityHangzhou 310006China

Large bone defect regeneration has always been recognized as a challenging clinical problem due to the difficulty of *** treatments exhibit certain inherent disadvantages(e.g.,secondary injury,immunization,and potential infections).However,three-dimensional(3D)printing technology as an emerging field can serve as an effective approach to achieve satisfactory revascularization while making up for the above limitations.A wide variety of methods can be used to facilitate blood supply during the design of a 3D-printed ***,the scaffold structure lays a foundation for the entire printing object;any method to promote angiogenesis can be effective only if it is based on well-designed *** this review,different designs related to angiogenesis are summarized by collecting the literature from recent *** 3D-printed scaffolds are classified into four major categories and discussed in detail,from elementary porous scaffolds to the most advanced bone-like ***,structural design suggestions to achieve rapid angiogenesis are proposed by analyzing the above *** review can provide a reference for organizations or individual academics to achieve improved bone defect repair and regeneration using 3D printing.

关键词： 3D printing Angiogenesis Bone regeneration Tissue engineering Biomimetic scaffolds

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Preferential Oxidation of CO in Excess Hydrogen over CuO-CeO_2 Catalyst Prepared by Chelating Method

引用

Journal of Natural Gas Chemistry 2007年第2期16卷 167-172页

作者： Zhigang Liu Renxian Zhou Xiaoming Zheng Institute of Catalysis Zhejiang University Hangzhou 310028 Zhejiang China

The CuO-CeO2 catalyst prepared by chelating method has a superior catalytic performance for the preferential oxidation of CO in rich hydrogen, compared with the CuO-CeO2 catalyst prepared by coprecipitation method. The CO conversions over these catalysts, at 120 ℃ and 120000 ml/（g-h） in the absence of CO2 and H2O, are 99.6% and 88.6%, respectively, and the selectivity of O2 over these catalysts is very close （i.e. 51.3% and 55.8%, respectively）. The influence of certain factors such as hydrogen concentration, carbon monoxide concentration, H2O, O2/CO ratios, and space velocity on the catalytic performance of CuO-CeO2 catalyst prepared by chelating method is also studied. The results show that the addition of hydrogen and H2O has a negative effect on the catalytic performance of CuO-CeO2 catalyst, however, the variation of space velocity and the O2/CO ratio causes a comparatively slight influence.

关键词： CuO-CeO2 chelating method preferential oxidation CO hydrogen

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：