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原位接枝改性纳米二氧化硅/聚丙烯复合材料的性能研究

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材料研究与应用 2010年第4期4卷 729-735页

作者：阮文红章明秋周彤辉王跃林容敏智中山大学材料科学研究所聚合物复合材料及功能材料教育部重点实验室广东广州510275 广州吉必时科技实业有限公司广东广州510510

通过熔融共混过程中原位接枝的方法制得聚丙烯酸丁酯接枝改性纳米二氧化硅/聚丙烯复合材料,并探讨了制备复合材料的最佳加工条件,研究了复合材料的机械性能、结晶性能、微观形貌以及动态粘弹行为.结果表明,少量纳米粒子(质量分数≤3%)... 详细信息

通过熔融共混过程中原位接枝的方法制得聚丙烯酸丁酯接枝改性纳米二氧化硅/聚丙烯复合材料,并探讨了制备复合材料的最佳加工条件,研究了复合材料的机械性能、结晶性能、微观形貌以及动态粘弹行为.结果表明,少量纳米粒子(质量分数≤3%)的加入即可对聚丙烯起到同时增强增韧的作用,制备原位接枝改性纳米二氧化硅/聚丙烯复合材料的适宜加工条件为熔融共混温度180℃,共混时间10min,转子转速60r/min.结晶行为的研究表明,除了一些纳米粒子作为成核剂,大部分纳米粒子可能分布在基体的无定形相并起到物理交联的作用.微观形态观察表明,在拉伸和冲击作用下,因与聚合物基体间具有良好的界面结合,改性纳米粒子从基体中脱粘时引发基体发生强烈的塑性变形,从而吸收大量的能量,并阻碍裂纹的扩展,对聚丙烯起到增强和增韧的作用.动态粘弹行为的研究进一步说明改性纳米粒子与基体之间的界面相互作用得到大大加强.

关键词：聚丙烯纳米二氧化硅原位接枝聚丙烯酸丁酯增韧增强

Quantum Information Splitting Based on Current Cavity QED Techniques

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Communications in Theoretical Physics 2008年第5期49卷 1165-1168页

作者： WU Huai-zhi YANG Zhen-Biao SU Wan-Jun ZHONG zhi-rong HUANG Jian-min Department of Electronic Science and Applied Physics Fuzhou University Fuzhou 350002 China

We propose two schemes for quantum information splitting via W-class state. The first scheme is based on the interaction of single atom with single-mode field, while the second scheme is based on the simultaneous interaction of two atoms with single-mode cavity. For the first scheme, the difIiculty of two atoms required to be simultaneously sent through one cavity is avoid. For the second scheme, it is immune to thermal field. Both schemes are experimentally feasible based on current cavity QED techniques.

关键词： resonant interaction thermal field information splitting

New Algorithm for 3D Facial Model Reconstruction and Its Application in Virtual Reality

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Journal of Computer Science & Technology 2004年第4期19卷 501-509页

作者： rong-HuaLiang zhi-GengPan ChunChen CollegeofComputerScience ZhejiangUniversityHangzhou310027P.R.China StateKeyLaboratoryofCADandCG ZhejiangUniversityHangzhou310027P.R.China

3D human face model reconstruction is essential to the generation of facial animations that is widely used in the field of virtual reality (VR). The main issues of 3D facial model reconstruction based on images by vision technologies are in twofold: one is to select and match the corresponding features of face from two images with minimal interaction and the other is to generate the realistic-looking human face model. In this paper, a new algorithm for realistic-looking face reconstruction is presented based on stereo vision. Firstly, a pattern is printed and attached to a planar surface for camera calibration, and corners generation and corners matching between two images are performed by integrating modified image pyramid Lucas-Kanade (PLK) algorithm and local adjustment algorithm, and then 3D coordinates of corners are obtained by 3D reconstruction. Individual face model is generated by the deformation of general 3D model and interpolation of the features. Finally, realistic-looking human face model is obtained after texture mapping and eyes modeling. In addition, some application examples in the field of VR are given. Experimental result shows that the proposed algorithm is robust and the 3D model is photo-realistic.

关键词： stereo vision image PLK algorithm 3D reconstruction texture mapping virtual reality

Image feature optimization based on nonlinear dimensionality reduction

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第12期10卷 1720-1737页

作者： rong ZHU min YAO School of Computer Science and Technology Zhejiang University Hangzhou 310027 China School of lnformation Engineering Jiaxing University Jiaxing 314001 China State Key Laboratory for Novel Software Technology Nanjing University Nanjing 210093 China

Image feature optimization is an important means to deal with high-dimensional image data in image semantic understanding and its applications. We formulate image feature optimization as the establishment of a mapping between highand low-dimensional space via a five-tuple model. Nonlinear dimensionality reduction based on manifold learning provides a feasible way for solving such a problem. We propose a novel globular neighborhood based locally linear embedding (GNLLE) algorithm using neighborhood update and an incremental neighbor search scheme, which not only can handle sparse datasets but also has strong anti-noise capability and good topological stability. Given that the distance measure adopted in nonlinear dimensionality reduction is usually based on pairwise similarity calculation, we also present a globular neighborhood and path clustering based locally linear embedding (GNPCLLE) algorithm based on path-based clustering. Due to its full consideration of correlations between image data, GNPCLLE can eliminate the distortion of the overall topological structure within the dataset on the manifold. Experimental results on two image sets show the effectiveness and efficiency of the proposed algorithms.

关键词： Image feature optimization Nonlinear dimensionality reduction Manifold learning Locally linear embedding (LLE)

Coherent Operation of the Collective Atomic Modes in the Coupled Cavity System

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Chinese Physics Letters 2013年第8期30卷 25-29页

作者： ZHONG zhi-rong Department of Physics Fuzhou UniversityFuzhou 350002

We study the dynamics of a coupled cavity system composed of three cavities,and propose a scheme for the coherent manipulation of two collective atomic modes by a control *** the scheme,the control atom and two atomic ensembles interact with the local cavity mode,while the control atom is externally driven by a laser *** show that under certain conditions,the dynamics of the whole system are reduced to an effective coherent coupling between the control atom and two collective atomic modes,while the cavity fields are only virtually *** also study the dynamics of the entanglement generation of the two distant collective atomic *** scheme provides a potential application for quantum-state engineering and quantum control.

关键词： field collective scheme

Topological Confinement in Reversibly Interlocked Polymer Networks

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Chinese Journal of Polymer Science 2024年第2期42卷 133-140,I0004页

作者： Wan-Ting Dai Zhen-Hua Xie Yu-Bin Ke Yang You min-zhi rong ming-Qiu Zhang Key Laboratory for Polymeric Composite and Functional Materials of ministry of Education GD HPPC LabIGCMESchool of ChemistrySun Yat-sen UniversityGuangzhou510275China Spallation Neutron Source Science Center China Spallation Neutron SourceDongguan523803China Institute of High Energy Physics Chinese Academy of SciencesBeijing100049China College of Materials and Metallurgy Guizhou UniversityGuiyang550025China

Recently, we reported a series of reversibly interlocked polymer networks(RILNs), whose mechanical robustness and functionalities improvement was believed to be derived from topological interlocking of two sub-networks, although the direct evidence for the deduction is still lacking. Herein, a specially-designed RILNs system, in which the inter-component hydrogen bonds can be shielded as needed, was prepared and used to study the micro-structures of RILNs, aiming to verify the existence of mechanical interlocking in RILNs. By changing the pH of the swelling solvent, the effect exerted by the inter-component non-covalent bonds was eliminated, so detailed information of the networks structure was exposed. The small angle X-ray scattering(SAXS) and small-angle neutron scattering(SANS) results indicated that swelling-induced structural evolution of the two sub-networks mutually affected each other, even when the inter-component hydrogen bonds were absent, proving the presence of topological interlocking. The findings may help to draw a more accurate physical image and reveal the detailed structureproperty relationship of RILNs.

关键词： Reversibly interlocked polymer networks Small angle X-ray scattering Small-angle neutron scattering Topological confinement

A Parallel Genetic Algorithm Based on Spark for Pairwise Test Suite Generation

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Journal of Computer Science & Technology 2016年第2期31卷 417-427页

作者： rong-zhi Qi zhi-Jian Wang Shui-Yan Li College of Computer and Information Hohai University Nanjing 211106 China CoUege of Science Hohai University Nanjing 211106 China

Pairwise testing is an effective test generation technique that requires all pairs of parameter values to be by at least one test case. It has been proven that generating minimum test suite is an NP-complete problem covered Genetic algorithms have been used for pairwise test suite generation by researchers. However, it is always a time-consuming process, which leads to significant limitations and obstacles for practical use of genetic algorithms towards large-scale test problems. Parallelism will be an effective way to not only enhance the computation performance but also improve the quality of the solutions. In this paper, we use Spark, a fast and general parallel computing platform, to parallelize the genetic algorithm to tackle the problem. We propose a two-phase parallelization algorithm including fitness evaluation parallelization and genetic operation parallelization. Experimental results show that our algorithm outperforms the sequential genetic algorithm and competes with other approaches in both test suite size and computational performance. As a result, our algorithm is a promising improvement of the genetic algorithm for pairwise test suite generation.

关键词： pairwise testing parallel genetic algorithm Spark test generation

Efficacy and safety of low-dose thalidomide combined with mesalazine in the treatment of refractory ulcerative colitis in adults

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Gastroenterology Report 2022年第1期10卷 653-655页

作者： Jun-rong Chen Lei Mai Jia-Chen Sun Xiang Peng min Zhang min zhi Department of General Practice The Sixth Affiliated HospitalSun Yat-sen UniversityGuangzhouGuangdongP.R.China Department of Gastroenterology The Fifth Affiliated HospitalSun Yat-sen UniversityZhuhaiGuangdongP.R.China Department of Gastrointestinal Endoscopy The Sixth Affiliated HospitalSun Yat-sen UniversityGuangzhouGuangdongP.R.China Department of Gastroenterology The Sixth Affiliated HospitalSun Yat-sen UniversityGuangzhouGuangdongP.R.China

Introduction Inducing and maintaining clinical remission and mucosal healing is essential in the treatment of ulcerative colitis(UC),a nonspecific chronic recurrent inflammatory disorder[1].Mesalazine(5-ASA)is commonly prescribed as a first-line drug for *** the short-term efficacy of ciclosporin and infliximab,some patients may develop methylprednisolone resistance or dependence[2].

关键词： healing clinical treatment

Development of a first-order kinetics-based model for the adsorption of nickel onto peat

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mining Science and Technology 2009年第2期19卷 230-234页

作者： LIU zhi-rong CHEN Xiao-song ZHOU Li-min WEI Peng Department of Applied Chemistry East China University of Technology Fuzhou Jiangxi 344000 China

The use of peat for the removal of nickel from aqueous solutions has been investigated at various pH values by means of static conditions. The present research shows that the ability of Ni to bind to peat increases as the pH value increases. The solutions reach adsorption equilibrium rapidly. A reasonable kinetic model, first-order in nickel concentration, has been developed and fitted to the adsorption of nickel （Ⅱ） onto peat. The first-order model provides a good correlation to the experimental data. The characteristic parameters of the Langmuir isotherm were determined at various temperatures. The relationship between kinetics and equilibrium isotherms was established through the forward- and backward-rate-constants, k~ and k2, and the equilibrium constant, K.

关键词： peat nickel adsorption first-order rate model pH isotherm