检索结果-南通市图书馆

硅磁微粒/聚苯胺复合物的制备及其对染料废水的吸附-降解性能

在线全文

学校读者我要写书评

暂无评论

中国科学：化学 2015年第2期45卷 202-210页

作者：丁艳金叶王伟祥李良超孔卫秋浙江师范大学化学与生命科学学院金华321004

通过水热法制备碳微球、共沉淀法制备空心Zn Fe2O4和原位聚合法制备Zn Fe2O4/Si O2/PANI复合物,并表征其结构、形貌、组成和性质.结果表明,Si O2对铁氧体的包覆能提高二元复合物对染料废水的降解性能;铁氧体与二氧化硅物质的量比(nZn Fe... 详细信息

通过水热法制备碳微球、共沉淀法制备空心Zn Fe2O4和原位聚合法制备Zn Fe2O4/Si O2/PANI复合物,并表征其结构、形貌、组成和性质.结果表明,Si O2对铁氧体的包覆能提高二元复合物对染料废水的降解性能;铁氧体与二氧化硅物质的量比(nZn Fe2O4/nSi O2)为1:3的Zn Fe2O4/Si O2复合物对染料废水具有较好的降解作用;Zn Fe2O4/Si O2/PANI复合物对染料废水的光催化降解活性随苯胺质量分数(wAn)的增加而增大,当wAn为50%时,Zn Fe2O4/Si O2/PANI复合物对染料废水去除率高达98%.样品因具有磁性而回收方便,重复使用性能良好.

关键词：铁氧体二氧化硅聚苯胺吸附-降解

WAVES IN PRE-STRETCHED INCOMPRESSIBLE SOFT ELECTROACTIVE CYLINDERS:EXACT SOLUTION

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2012年第5期25卷 530-541页

作者： weiqiu Chen Huihui Dai Soft Matter Research Center (SMRC) Zhejiang University Hangzhou 310027 China Department of Engineering Mechanics Zhejiang University Hangzhou 310027 China Department of Mathematics City University of Hong Kong Kowloon Hong Kong China

This paper studies wave propagation in a soft electroactive cylinder with an under- lying finite deformation in the presence of an electric biasing field. Based on a recently proposed nonlinear framework for electroelastieity and the associated linear incremental theory, the basic equations governing the axisymmetric wave motion in the cylinder, which is subjected to homo- geneous pre-stretches and pre-existing axial electric displacement, are presented when the elec- troactive material is isotropic and incompressible. Exact wave solution is then derived in terms of （modified） Bessel functions. For a prototype model of nonlinear electroactive material, illus- trative numerical results are given. It is shown that the effect of pre-stretch and electric biasing field could be significant on the wave propagation characteristics.

关键词： electroelastic waves finite pre-stretch soft electroactive cylinder dispersion rela-tion

Effects of functionally graded materials on dynamics of molecular bond clusters

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2012年第6期55卷 980-988页

作者： ZHANG WenLiang QIAN Jin YAO HaiMin CHEN weiqiu GAO HuaJian Department of Engineering Mechanics Zhejiang UniversityHangzhou 310027China Soft Matter Research Center Zhejiang UniversityHangzhou 310027China Department of Mechanical Engineering Hong Kong Polytechnic UniversityHong KongChina School of Engineering Brown UniversityProvidenceRI 02912USA

Unlike nonspecific adhesion of conventional hard materials in engineering commonly described by JKR and DMT type models,the molecular adhesion via specific receptor-ligand bonds is stochastic by nature and has the feature that its strength strongly depends on the medium stiffness surrounding the *** this paper,we demonstrate in a stochastic-elasticity framework that a type of materials with linearly graded elastic modulus can be designed to achieve "equal load sharing" and enhanced cooperative rebinding among interfacial molecular *** modulus gradation,multiple molecular bonds can be elastically decoupled but statistically *** general,uniform molecular adhesion can be accomplished by two strategies:homogeneous materials with sufficient stiffness higher than a threshold or heterogeneous materials satisfying the criterion on modulus *** results not only provide a theoretical principle for possible applications of functionally graded materials in quantitatively controlling cell-matrix adhesion,but also have general implications on adhesion between soft materials mediated by specific molecular binding.

关键词： graded material adhesion molecular bond stiffness gradation

Frequency comb in a parametrically modulated micro-resonator

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2022年第11期38卷 79-88页

作者： Xuefeng Wang Qiqi Yang Zhan Shi Ronghua Huan weiqiu Zhu Xingjian Jing Zichen Deng Xueyong Wei Department of Engineering Mechanics MIIT Key Laboratory of Dynamics and Control of Complex SystemsNorthwestern Polytechnical UniversityXi’an710072China Department of Mechanics Key Laboratory of Soft Machines and Smart Devices of Zhejiang ProvinceZhejiang UniversityHangzhou310027China State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’an710049China Department of Mechanical Engineering City University of Hong KongHong Kong999077China

In this paper,we report the frequency comb response experimentally and analytically in a rhombic micro-resonator with parametrical *** the electrostatically actuated rhombic micro-resonator is modulated axially by a low-frequency periodic excitation,a comb-like vibration response with few equidistant positioned fingers in the frequency domain is *** finger spacing of frequency comb response is exactly consistent with modulation frequency and the number and amplitude of the fingers can be tuned by modulation strength.A mixed frequency comb with extra comb fingers is further generated when the resonator is modulated simultaneously by two different low-frequency excitation *** adjusting the relation of the two modulation frequencies,unequal spacing frequency combs are achieved for the first time,which leads to a more flexible tunability of the comb spacing for different *** analysis based on the dynamic model well explains the corresponding observations.

关键词： Micro-resonator Nonlinear dynamics Vibration Parametrical modulation Frequency comb