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Low velocity impact response and energy absorption behavior on glass fibre reinforced epoxy composites

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Science China(Technological Sciences) 2017年第9期60卷 1339-1346页

作者： SHEN YiOu JIANG bing LI yan JIANG Xu School of Aerospace Engineering and Applied Mechanics Tong/i University Shanghai 200092 China Key Laboratory of Advanced Civil Engineering Materials Ministry of Education Tongji University Shanghai 200092 China Department of Bridge Engineering College of Civil Engineering Tongji University Shanghai 200092 China

A study was undertaken to determine the effects of several key geometry influencing factors on the impact response and energy absorption behavior of the glass fibre reinforced epoxy composites at low and intermediate *** energy-balance model was employed for characterising the energy absorption behavior and it depends strongly on the plate diameter and *** addition,the damage *** and force maps is effective in monitoring damage growth within the composite *** response of the composite laminate configurations characterized by different stacking sequences subjected to low velocity impacts with different impact energies have also been studied to estimate the damage initiation of composites.

关键词： low velocity impact geometry influencing factor stacking sequence energy absorption GFRP composites

Postnatal development of rat retina:a continuous observation and comparison between the organotypic retinal explant model and in vivo development

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Neural Regeneration Research 2025年第3期20卷 900-912页

作者： Baoqi Hu Rui Wang Hanyue Zhang xiou Wang Sijia Zhou Bo Ma yan Luan xin Wang xinlin Chen Zhichao Zhang Qianyan Kang Department of Ophthalmology The First Affiliated Hospital of Xi’an Jiaotong UniversityXi’anShaanxi ProvinceChina Department of Ophthalmology The First Affiliated Hospital of Northwest UniversityXi’anShaanxi ProvinceChina Institute of Neurobiology Xi’an Jiaotong University Health Science CenterXi’anShaanxi ProvinceChina

The organotypic retinal explant culture has been established for more than a decade and offers a range of unique advantages compared with in vivo experiments and cell ***,the lack of systematic and continuous comparison between in vivo retinal development and the organotypic retinal explant culture makes this model controversial in postnatal retinal development ***,we aimed to verify the feasibility of using this model for postnatal retinal development studies by comparing it with the in vivo *** this study,we showed that postnatal retinal explants undergo normal development,and exhibit a consistent structure and timeline with retinas in ***,we used SOX2 and PAX6 immunostaining to identify retinal progenitor *** then examined cell proliferation and migration by immunostaining with Ki-67 and doublecortin,***-67-and doublecortin-positive cells decreased in both in vivo and explants during postnatal retinogenesis,and exhibited a high degree of similarity in abundance and distribution between ***,we used Ceh-10 homeodomain-containing homolog,glutamate-ammonia ligase(glutamine synthetase),neuronal nuclei,and ionized calcium-binding adapter molecule 1 immunostaining to examine the emergence of bipolar cells,Müller glia,mature neurons,and microglia,*** timing and spatial patterns of the emergence of these cell types were remarkably consistent between in vivo and explant *** study showed that the organotypic retinal explant culture model had a high degree of consistency with the progression of in vivo early postnatal retina *** findings confirm the accuracy and credibility of this model and support its use for long-term,systematic,and continuous observation.

关键词： bipolar cells differentiation in vivo microglia Müller glia organotypic retinal explant culture postnatal retina development proliferation retinal progenitor cells

A new method for particle manipulation by combination of dielectrophoresis and field-modulated electroosmotic vortex

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Applied Mathematics and Mechanics(English Edition) 2018年第3期39卷 409-422页

作者： Chuanchuan xiE Bo CHEN bing yan Jiankang WU School of Civil Engineering and Mechanics Huazhong University of Science and Technology Department of Mechanical and Electrical Engineering Wenhua College

A field-modulated electroosmotic flow （FMEOF） in a microchannel can be obtained by applying modulating electric fields in a direction perpendicular to the channel wall. Micro-vortexes are generated around the electrodes along with an EOF due to the surface charge on the modulated wall. When polarizable particles are suspended near the electrodes, they experience dielectrophoretic forces due to a non-uniform electric field. In this paper, micro-vortexes and dielectrophoretic forces are combined to achieve separation and trap different sized particles in a continuous flow. Numerical results indicate that by adjusting the driving electric field parallel to the channel wall and the modulating electric field, the ratio of dielectrophoretic and hydrodynamic forces can be altered. One type of particles can be trapped by micro-vortexes （negative dielectrophoresis （DEP））, and the other particles are transported to the downstream so that the particles are separated. The influence of the electrode length and the channel height on the trapping rate is investigated.

关键词： electroosmotic dielectrophoretic micro-vortex particle separation

New design of large fully-steerable radio telescope reflector based on homogenized mesh structure

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Research in Astronomy and Astrophysics 2021年第10期21卷 27-36页

作者： Li-De yan Fei Zheng xi Rui School of Mechano-Electronic Engineering Xidian UniversityXi'an 710071China

The self-weight of a large fully-steerable radio telescope is one of the important factors affecting its *** the existing reflector system scheme,the problem of surface accuracy caused by its large and heavy structure has seriously restricted the application and implementation of large radio ***,a new mesh structure scheme for a large fully-steerable radio telescope reflector is proposed in this *** scheme is based on a homogenized mesh back-up structure in the form of a quasi-geodesic grid and regular quasi-tri-prism or tetrahedron,which can significantly reduce the structural complexity and self-weight of the reflector under the condition that the reflector can meet the desired performance ***,the feasibility and rationality of the scheme are evaluated by numerical simulation analysis,which has significant advantages and provides a new design for the reflector of a large fullysteerable radio telescope.

关键词： telescopes techniques:radar astronomy methods:data analysis

Peroxisome proliferator-activated receptor γ ligands suppress liver carcinogenesis induced by diethylnitrosamine in rats

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World Journal of Gastroenterology 2004年第23期10卷 3419-3423页

作者： yan-TongGuo xi-ShengLeng TaoLi Jing-MingZhao xi-HouLin DeoartmentofGeneralSurgery BeijingJishuitanHospitaltheForthClinicalMedicalCollegeofPekingUniversityBeijing100035China DepartmentofGeneralSurgery PeopleHospitalofPekingUniversityBeijing100044China

AIM: Peroxisome proliferator-activated receptor γ (PPARγ) is known to regulate growbh arrest and terminal differentiation of adipocytes and is used clinically as a new class of antidiabetic drugs. Recently, several studies have reported that treatment of cancer cells with PPARγ ligands could induce cell differentiation and apoptosis, suggesting a potential application as chemopreventive agents against carcinogenesis. In the present study, 3 different kinds of PPARγ ligands were subjected to the experiments to confirm their suppressive effects on liver ***: Three PPARy ligands, pioglitazone (Pio) (200 ppm),rosiglitazone (Rosi) (200 ppm), and troglitazone (Tro) (1 000 ppm) were investigated on the induction of the placental form of rat glutathione S-transferase (rGST P) positive foci, a precancerous lesion of the liver,and liver cancer formation using a diethylnitrosamine-induced liver cancer model in Wistar rats, and dose dependency of a PPART ligand was also ***: PPART ligands reduced the formation of rGST P-positive foci by diethylnitrosamine and induction of liver cancers was also markedly suppressed by a continuous feeding of Pio at 200 ***: PPART ligands are potential chemoprevenvea gents for liver carcinogenesis.

关键词：过氧化物酶体增殖刺激受体 γ配合体基因表达肝脏致癌作用二乙基亚硝胺老鼠抑制作用

Stabilization and trajectory tracking of autonomous airship's planar motion

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Journal of Systems Engineering and Electronics 2008年第5期19卷 974-981页

作者： Zhang yan Qu Weidong xi Yugeng Cai Zili Dept. of Automation Shanghai Jiaotong Univ. Shanghai 200240 P. R. China GE (China) Research and Development Center Co. Ltd Shanghai 201203 P. R. China

The stabilization and trajectory tracking problems of autonomous airship＇s planar motion are studied. By defining novel configuration error and velocity error, the dynamics of error systems are derived. By applying Lyapunov stability method, the state feedback control laws are designed and the close-loop error systems are proved to be uniformly asymptotically stable by Matrosov theorem. In particular, the controller does not need knowledge on system parameters in the case of set-point stabilization, which makes the controller robust with respect to parameter uncertainty. Numerical simulations illustrate the effectiveness of the controller designed.

关键词： airship planar motion stabilization trajectory tracking robustness Lyapunov stability Matrosov theorem.

Analyses for specific defects in Android applications:a survey

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Frontiers of Computer Science 2019年第6期13卷 1210-1227页

作者： Tianyong WU xi DENG Jun yan Jian ZHANG State Key Laboratory of Computer Science Institute of SoftwareChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Technology Center of Software Engineering Institute of SoftwareChinese Academy of SciencesBeijing 100190China

Android applications(APPS)are in widespread use and have enriched our *** ensure the quality and security of the apps,many approaches have been proposed in recent years for detecting bugs and defects in the apps,of which program analysis is a major *** paper mainly makes an investigation of existing works on the analysis of Android *** summarize the purposes and proposed techniques of existing approaches,and make a taxonomy of these works,based on which we point out the trends and challenges of research in this *** our survey,we sum up four main findings:(1)program analysis in Android security field has gained particular attention in the past years,the fields of functionality and performance should also gain proper attention;the infrastructure that supports detection of various defects should be enriched to meet the industry’s need;(2)many kinds of defects result from developers’misunderstanding or misuse of the characteristics and mechanisms in Android system,thus the works that can systematically collect and formalize Android recommendations are in demand;(3)various program analysis approaches with techniques in other fields are applied in analyzing Android apps;however,they can be improved with more precise techniques to be more applicable;(4)The fragmentation and evolution of Android system blocks the usability of existing tools,which should be taken into consideration when developing new approaches.

关键词： Android apps program analysis security functionality performance

A novel epoxy methacrylate resin containing phthalazinone moiety for UV coatings

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Chinese Chemical Letters 2007年第5期18卷 598-600页

作者： yan Kou Jin yan Wang xi Gao Jian Department of Polymer Science and Materials Dalian University of TechnologyLiaoning High Performance Resin Engineering Research Center Dalian 116012 China

A novel ohthalazinone modified epoxy acrylate resin for the high temperature resistant ultravioet （UV） curable *** *** methacrylated epoxy resins obtained were utilized to UV radiation curing by taking 2.5% （wt%） of photoinitiator in combination with 20% （wt%） of diluent, and generated the interpenetraring polymer networks. The cured film had good thermal and chemical stability.

关键词： UV curable Epoxy acrylate Phthalazione Crosslinking

THE SOLVABILITY CONDITIONS FOR THE INVERSE PROBLEM OF BISYMMETRIC NONNEGATIVE DEFINITE MATRICES

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Journal of Computational Mathematics 2000年第6期18卷 597-608页

作者： Dong-xiu xie Lei Zhang xi-yan Hu Department of Applied Mathematics Dalian University of TechnologyDalian 116023China Department of Applied Mathematics Hunan UniversityChangsha 410082China Hunan Computing Center Changsha 410012China

A = (a[sub ij]) ∈ R[sup n×n] is termed bisymmetric matrix if a[sub ij] = a[sub ji] = a[sup n ? j + 1, n ? i + 1], i, j = 1, 2 ··· n. We denote the set of all n x n bisymmetric matrices by BSR[sup n x n]. This paper is mainly concerned with solving the following two problems: Problem I. Given X, B ∈ R[sup n×m], find A ∈ P[sub n] such that AX = B, where P[sub n] = {A ∈ BSR[sup n×n]| x[sup T] Ax ≥ 0, ?x ∈ R[sup n]}. Problem II. Given A[sup *] ∈ R[sup n×n], find ? ∈ S[sub E] such that ||A[sup *] - ?||[sub F] = ... ||A[sup *] - A||[sub F] where || · ||[sub F] is Frobenius norm, and S[sub E] denotes the solution set of problem I. The necessary and sufficient conditions for the solvability of problem I have been studied. The general form of S[sub E] has been given. For problem II the expression of the solution has been provided. [ABSTRACT FROM AUTHOR]

关键词： Frobenius norm bisymmetric matrix the optimal solution