检索结果-南通市图书馆

Optomechanical ratchet resonators

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2022年第3期65卷 19-25页

作者： Wenjie Nie Leqi Wang yu Wu Aixi Chen yueheng lan Department of Applied Physics East China Jiaotong UniversityNanchang 330013China Department of Physics Zhejiang Sci-Tech UniversityHangzhou 310018China Department of Physics Beijing University of Posts and TelecommunicationsBeijing 100876China

We describe an optomechanical ratchet scheme to realize nonreciprocal transmission of a light field, which is based on the bias of the optical cavity’s frequency spectrum caused by mechanical ratchet interactions. This approach to break the time-reversal symmetry of light propagation is universally valid in various optomechanical systems with ratchet-oscillator structures. We discuss specifically the implementation of an on-chip Casimir-ratchet optomechanical protocol and demonstrate the optical nonreciprocity with an extremely high isolation ratio and flexible controllability, which does not require external additional optical engineering. Our study opens a door for manipulating flexibly light propagation by using mechanical ratchet resonators, and has potential applications in the on-chip integration of nonreciprocal devices and harness of lateral Casimir forces.

关键词： optomechanics nonreciprocal transmission Casimir effect ratchet effect

同方期刊数据库

Wide-ranging Force Responsive Composites based on 1,2-Dioxetane and ZnS as Luminescent Probes in Polyurethanes

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2023年第8期41卷 1162-1168,I0005页

作者： Jin-Hui Zhang Shuang Liu yuan yuan yu-lan Chen Department of Chemistry Tianjin Key Laboratory of Molecular Optoelectronic ScienceTianjin UniversityTianjin 300354Chin State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun 130012Chin

Combining the advantages of mechanochemiluminescence from 1,2-dioxetane and elastico-mechanoluminescence from ZnS particles,a new kind of mechanoluminescent polymer composites are *** can emit bright luminescence with two distinct colors at different strains,empowering a verstaile mechanochemical strategy for force sensing and damage detection at a wider force responsive range.

关键词： Mechanochemiluminescence 1,2-Dioxetane Elastico-mechanoluminescence ZnS Polymer composites

Effect of amnion membrane transplantation on corneal neovascularization in 10 patients with alkali burn

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2011年第1期4卷 110-111页

作者： lan Yin yu-Li Pi Department of Ophthalmology the First Affiliated Hospital of General Hospital of PLA Beijing 100048 China

By observing clinical cases, we studied the curative effect of amnion membrane transplantation on decreasing corneal neovascularization (CNV). It was a non-randomized retrospective case-control study. Among 17 cases (21 eyes) of third-degree alkali burns from 2007 to 2010, 10 cases (12 eyes) were performed with amnion membrane transplantation operation, and others were not. Amnion membrane transplantation was performed at the 3rd day after burn in the treatment group. Areas of CNV in double groups were measured at the 14th day and 60th day after burn. Area of CNV in the treatment group was (66.207±7.251)mm2 at the 14th day after burn, and was 18.27% lower than that in the control group. Area of CNV in the treatment group was (120.046±13.812)mm2 at the 60th day after burn, and was 11.35% lower than that in the control group. There was both statistical significance (Plantation operation can inhibit the growth of corneal neovascularization induced by alkali burn.

关键词： amnion transplantation eye burn corneal neovascularization

黔北正安地区安场向斜奥陶系五峰组—志留系龙马溪组页岩气富集规律

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

岩性油气藏 2025年第1期37卷 182-193页

作者：吴松冯冰于继良蓝宝锋李龙王胜沈家宁李刚权贵州乌江能源投资有限公司贵州页岩气勘探开发有限责任公司贵州能源集团有限公司贵州能源产业研究院有限公司

四川盆地外缘黔北地区具有良好的页岩气勘探开发前景。基于测井、录井及分析化验等资料，对黔北正安地区安场向斜奥陶系五峰组—志留系龙马溪组页岩气储层特征及富集规律进行了分析。研究结果表明：（1）黔北正安地区安场向斜奥陶系五... 详细信息

四川盆地外缘黔北地区具有良好的页岩气勘探开发前景。基于测井、录井及分析化验等资料，对黔北正安地区安场向斜奥陶系五峰组—志留系龙马溪组页岩气储层特征及富集规律进行了分析。研究结果表明：（1）黔北正安地区安场向斜奥陶系五峰组—志留系龙马溪组岩性主要为硅质页岩与硅质岩，孔隙类型主要为有机孔隙及粒间孔、粒内溶孔、晶间孔等无机孔隙与页理缝和构造缝及微裂缝等。岩石中总有机碳（TOC）为0.34%～6.65%，平均为3.69%，纵向上自下而上总体呈先增大后减小的趋势，平面上在向斜核部的TOC含量较高，呈环带状向四周降低。岩心含气的质量体积为1.6～6.2 m3/t，平均为3.9 m3/t，龙马溪组总含气量垂向上随着深度的增加而增加，平面上从向斜中部向南北两端逐渐降低，从向斜核部向两翼逐渐降低。矿物脆性指数总体较高，具有很好的可压裂性。（2）研究区五峰组—龙马溪组为“陆棚边缘、改造残留、向斜浅埋”的独特地质背景，其有利的沉积环境及古生产力为页岩气富集成藏奠定了基础，良好的保存条件避免了页岩储层中天然气的大量逸散，上覆的新滩组盖层与下伏的宝塔组底板形成了“上盖下堵”的封堵组合。（3）盆外残余向斜页岩气在向斜中心明显富集，核部是页岩气聚集的有利位置，两翼低角度逆断层遮挡处也是页岩气的有利富集部位，微裂缝的发育有利于页岩气的聚集与稳产，因此中浅层残余向斜的井位部署应重点考虑“宽、缓、深”的核心部位。

关键词：页岩气储层特征脆性指数上盖下堵断层遮挡核部富集奥陶系五峰组—志留系龙马溪组安场向斜黔北地区

维普期刊数据库博看期刊

同方期刊数据库

Simultaneous anaerobic-aerobic biodegradation of halogenated phenolic compound under oxygen-limited conditions

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2005年第5期17卷 873-875页

作者： CHEN yuan-cai lan Hui-xia ZHAN Huai-yu FU Shi-yu State Key Laboratory of Pulp and Paper Engineering South China University of Technology Guangzhou 510641 China Laboratory of Cellulose and Liguocellulosics Chemistry Chinese Academy of Sciences Guangzhou 510650 China

The successful application of co-immobilized aerobic-anaerobic biomass under limited aeration in wastewater treatment systems would eliminate the problems associated with the intermediates mono-chlorophenol（MCP） and di-chlorophenol（DCP） accumulations. With low initial pentachlorophenol（PCP） concentration, all PCP could be completely removed under oxygen-limited strict anaerobic conditions, and the removal efficiencies with different initial headspace oxygen percentage（IHOP） were not obviously different from each other. While at high initial PCP concentration, under strictly anaerobic conditions PCP and their intermediates were clearly higher than that under other conditions, and produced obvious accumulation, the highest PCP reduction was achieved by the system receiving 30 IHOP, oxygen-limited system also exhibited lower residual TOC concentration and lower concentration of metabolic intermediates MCP and DCP. These results suggested that under strictly anaerobic condition the reductive dechlorination of low chlorinated compounds became rate limiting in the reductive dechlorination pathway, less chlorinated compounds be more amenable to aerobic degradation, and the aerobes of outer layers could function under limited oxygen. The co-immobilized aerobic-anaerobic biomass for methanogenesis under limited-aeration for chlorophenol degradation might be an attractive and efficient alternative for the sequential anaerobic/aerobic system to achieve mineralization of a broad range of recalcitrance highly chlorinated organics and low final TOC concentrations.

关键词： PCP oxygen-limited immobilized cellr

Isogeometric Analysis and Shape Optimization of Holed Structures via the Patch Removing Technique

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2020年第9期124卷 787-806页

作者： Daoyuan yu Shouyu Cai Wenya Fan lan Zhang School of Mechanics and Safety Engineering Zhengzhou UniversityZhengzhou450001China

In this study,a patch removing based Isogeometric analysis(PR-IGA)method is proposed to conduct the holed structural analysis with only one parametric domain,in which there are also no trimmed *** theoretical foundation of this novel patch removing approach is that any holed structure can be obtained by removing sub-patches(i.e.,the holes)from an intact base *** the parametric domains of these patches are all meshed by rectangular grids,the elements in the resulted holed structural parametric domain could all be untrimmed rectangles under certain mapping *** achieve the special condition,a systematic technique consisting of T-spline local refinement and control points substitution/adjustment is *** to the intactness of parametric elements,the analysis procedure of holed structures based on the proposed PRIGA is quite simplified and efficient compared to traditional multi-patch and trimming ***,after the deduction of analytical sensitivities related to structural mass and mechanical responses,the PR-IGA is directly employed in the holed structural shape optimization to successfully eliminate the need for model transformation during modeling,analysis and optimization *** examples involving analysis and shape optimization of complex holed structures are presented to demonstrate the effectiveness of the proposed method.

关键词： Isogeometric analysis patch removing shape optimization holed structure

Comparison of Algorithms for an Electronic Nose in Identifying Liquors

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2008年第3期5卷 253-257页

作者： Zhi-biao Shi Tao yu Qun Zhao Yang Li yu-bin lan School of Energy Resources and Mechanical Engineering Northeast Dianli University Jilin 132012 P. R. China School of Chemistry Engineering Northeast Dianli University Jilin 132012 P. R. China School of Electrical Engineering Northeast Dianli University Jilin 132012 P. R. China Aerial Application Technlogy usDA-ARS-SPARC-APMRU Co）lege Station TX 77845 USA

When the electronic nose is used to identify different varieties of distilled liquors, the pattern recognition algorithm is chosen on the basis of the experience, which lacks the guiding principle. In this research, the different brands of distilled spirits were identified using the pattern recognition algorithms （principal component analysis and the artificial neural network）. The recognition rates of different algorithms were compared. The recognition rate of the Back Propagation Neural Network （BPNN） is the highest. Owing to the slow convergence speed of the BPNN, it tends easily to get into a local minimum. A chaotic BPNN was tried in order to overcome the disadvantage of the BPNN. The convergence speed of the chaotic BPNN is 75.5 times faster than that of the BPNN.

关键词： electronic nose liquor algorithm principal component analysis

Novel high-resolution DOA estimation using subspace projection method

在线全文

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2012年第4期19卷 110-116页

作者： SI Wei-jian lan Xiao-yu ZOU Yan College of Information and Communication Engineering Harbin Engineering University Harbin 150001 China No. 91404 Army Qinhuangdao 066000 China

The performance of multiple signal classification （MUSIC） algorithm with regard to solving closely spaced direction of arrivals （DOAs） depends strongly upon the signal-to-noise ratio （SNR） and snapshots. In order to solve this problem, a method by reconstructing the spatial spectrum function with both noise subspace and signal subspace is presented in this paper. The key idea is to apply the full information contained in covariance matrix and change the projection weights of steering vector on the noise and signal subspace by their revised eigenvalues, respectively. Comparing with the MUSIC algorithm, it does not increase any computational complexity either, and remarkably, it has the advantages of simultaneously reducing noise and keeping the high-resolution ability under low SNR and small sample sized scenarios. Simulation and experiment results are included to demonstrate the superior performance of the proposed algorithm.

关键词： direction &arrival (DOA) multiple signal classification low SNR resolution subspace projection

Rapidly growing primary anal canal lymphoma:a case report and literature review

在线全文

学校读者我要写书评

暂无评论

Gastroenterology Report 2023年第1期11卷 582-584页

作者： yu Kyung chung Su Bum Park Department of Internal Medicine Pusan National University School of Medicine and Research Institute for Convergence of Biomedical Science and TechnologyPusan National University Yangsan HospitalYangsanRepublic of Korea

Introduction Anal cancer is a rare cancer accounting for2%of all gastrointestinal tract malignancies[1].Among anal cancers,squamous cell cancer(SCC)is the most common and lymphoma is one of the least *** gastrointestinal tract is the most common site for extranodal non-Hodgkin’s lymphoma(NHL),and diffuse large B-cell lymphoma(DLBCL)is the most common histologic ***,primary colorectal lymphoma accounts for only 0.3%of all large intestinal malignancies and3%of all gastrointestinal lymphomas[2].Anal canal SCC and lymphomas are treated differently;thus,accurate diagnosis is crucial.

关键词： lymphoma gastrointestinal diagnosis