检索结果-南通市图书馆

A Schrodinger Formulation for Paraxial Light Beam Propagation and Its Application to Propagation through Nonlinear Parabolic-Index Media

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2000年第10期17卷 734-736页

作者： LIU Timon Cheng-yi GUO Hong hu Wei DENG Xi-ming Laboratory of Light Transmission Optics South China Normal UniversityGuangzhou 510631 National Laboratory on High Power Laser and Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800

The Helmholtz equation is reduced to the Schrodinger-like equation and then the quantities representing the gross features for a paraxial optical beam,such as the width,divergence,radius of curvature of the wave front,complex beam parameter,beam quality factor,and the potential function representing beam propagation stability,are studied by using the quantum mechanical *** results derived in other ways previously are rederived by ur formulation in a more systematical and explicit fashion analytically,and some new results are *** general equations for the evolution of these quantities,i.e.,the first-and second-order differential equations with respect to the propagation distance,such as the universal formula for the width and curvature radius,tl~e general formula for the first derivative of the complex beam parameter with respect to the axial coordinate,the general formula for the second derivative of the width with respect to the axial coordinate,and some general criteria for the conservation of the beam quality factor and the existence of a potential well of the potential function,are *** also discuss the application of our formulation to nonlinear parabolic-index media.

关键词： axial beam curvature

Ergodicity recovery of random walk in heterogeneous disordered media

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第5期29卷 165-173页

作者： Liang Luo ming yi Department of Physics Huazhong Agricultural UniversityWuhan 430070China Institute of Applied Physics Huazhong Agricultural UniversityWuhan 430070China School of Mathematics and Physics China University of GeosciencesWuhan 430074China

Significant and persistent trajectory-to-trajectory variance are commonly observed in particle tracking experiments,which have become a major challenge for the experimental data *** this theoretical paper we investigate the ergodicity recovery behavior,which helps clarify the origin and the convergence of trajectory-to-trajectory fluctuation in various heterogeneous disordered *** concepts of self-averaging and ergodicity are revisited in the context of trajectory *** slow ergodicity recovery and the non-Gaussian diffusion in the annealed disordered media are shown as the consequences of the central limit theorem in different *** strange ergodicity recovery behavior is reported in the quenched disordered case,which arises from a localization *** first-passage approach is introduced to the ergodicity analysis for this case,of which the central limit theorem can be employed and the ergodicity is recovered in the length scale of diffusivity correlation.

关键词： anomalous diffusion random walk disordered systems non-Gaussian diffusion

Macrostructure and properties of thin walled copper tubes prepared by the downward continuous unidirectional solidification method

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2010年第1期17卷 63-68页

作者： Xi Shen Hong Zhang Zi-dong Wang hua-fen Lou yi-ming Jia Ping-xia hu School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China CHINALCO Luoyang Copper Co. Ltd. Luoyang 471000 China

The macrostructure and properties of the thin walled copper tube prepared by the downward continuous unidirectional solidification （DCUS） method were studied. The result shows that the macrostructure is closely related to the solid-liquid interface profile, which is influenced by the distance between the cooling water location and the solidification front. The mechanical properties of the thin walled copper tube prepared by the DCUS method are near those of the normal cast copper, and it has good relative density, electrical conductivity, and elongation, which are not greatly affected by casting speed. The thin walled copper tube prepared by the DCUS method also has good processing properties that can be taken to further drawing procedures directly without an intermediate process, and obtains good mechanical properties with the total processing rate of 89.8%.

关键词： unidirectional solidification copper tube short process macrostructure mechanical properties

Integrated Planning of an Active Distribution Network and DG Integration in Clusters Considering a Novel Formulation for Reliability Assessment

在线全文

学校读者我要写书评

暂无评论

CSEE Journal of Power and Energy Systems 2023年第2期9卷 561-576页

作者： Di hu Lei Sun ming Ding School of Electrical Engineering and Automation Hefei University of TechnologyHefei 230009China Anhui Provincial Laboratory of Renewable Energy Utilization and Energy Saving Hefei University of TechnologyHefei 230009China

The concept of DG clusters is introduced with highly penetrated integration of distributed generation(DG)into active distribution networks(ADNs).DG clusters are referred to as parts of an ADN,including DGs,distribution lines and *** formation of DG clusters helps to optimally dispatch DG outputs within *** this regard,an integrated planning strategy of ADNs and DGs in cluster(IPNDGC)is *** order to guarantee that the planning strategy meets the reliability requirements,a reliability assessment is considered in the proposed ***,reliability assessment is generally accomplished according to a fixed network topology and known DG allocation,which makes it difficult to integrate reliability into planning *** deal with this difficulty,a novel formulation method for reliability assessment is proposed considering the network topology uncertainties and isolated operating probabilities of DG *** reliability index(RI)represented by expected customer interruption cost(ECOST)is employed in the proposed planning *** planning model is formulated as a mixed integer second order conic programming planning *** actual distribution system is employed to illustrate the accuracy and efficiency of the proposed planning model.

关键词： DG cluster distribution network planning reliability

Efficient ID-based TPM key loading scheme for trusted platform

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2010年第4期17卷 74-79页

作者： SONG Cheng LIU Bing hu Zheng-ming XIN Yang YANG yi-xian yiN Han Information Security Center State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China Key Laboratory of Network and Information Attack and Defense Technology of Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China National Engineering Laboratory for Disaster Backup and Recovery Beijing University of Posts and Telecommunications Beijing 100876 China Beijing Safe-Code Technology Co. Ltd Beijing 100876 China huawei Technology Ltd Beijing 100093 China

One important function in trusted computing is protected storage, which can protect unlimited amount of data and keys. In the existing trusted platform module （TPM） key loading scheme for trusted platform, a computing platform with TPM as its trusted anchor, the total times of loading operation is the same as the number of the loaded target object＇s ancestors, resulting in low efficiency of loading a TPM key which has many ancestors. To improve efficiency, an identity-based TPM key loading scheme is proposed. In this scheme, the times of loading operation is only two when any TPM key is loaded into TPM. Therefore, the required time cost for loading a TPM key can be reduced, especially for complex TPM key storage hierarchy. By analyzing the correctness, security, efficiency and feasibility, the proposed scheme has the better theoretical and application value.

关键词： trusted computing trusted platform module protected storage ID-based

Mitochondrial DNA-triggered innate immune response:mechanisms and diseases

在线全文

学校读者我要写书评

暂无评论

Cellular & Molecular Immunology 2023年第12期20卷 1403-1412页

作者： ming-ming hu Hong-Bing Shu Department of Infectious Diseases Medical Research InstituteZhongnan Hospital of Wuhan UniversityFrontier Science Center for Immunology and MetabolismTaikang Center for Life and Medical SciencesCollege of Life SciencesWuhan UniversityResearch Unit of Innate Immune and Inflammatory DiseasesChinese Academy of Medical SciencesWuhan430072China Research Unit of Innate Immune and Inflammatory Diseases Chinese Academy of Medical SciencesWuhan430072China

Various cellular stress conditions trigger mitochondrial DNA(mtDNA)release from mitochondria into the *** released mtDNA is sensed by the cGAS-MITA/STING pathway,resulting in the induced expression of type I interferon and other effector *** processes contribute to the innate immune response to viral infection and other stress *** deregulation of these processes causes autoimmune diseases,inflammatory metabolic disorders and ***,the cGAS-MITA/STING pathway is a potential target for intervention in infectious,inflammatory and autoimmune diseases as well as *** this review,we focus on the mechanisms underlying the mtDNA-triggered activation of the cGAS-MITA/STING pathway,the effects of the pathway under various physiological and pathological conditions,and advances in the development of drugs that target cGAS and MITA/STING.

关键词： Mitostress Virus Innate immunity Disease MITA/STING

Effect of Carbon Content on Stacking Fault Energy of Fe-20Mn-3Cu TWIP Steel

维普期刊数据库评论

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 Iron and Steel Research International 2014年第1期21卷 116-120页

作者： Xian PENG Ding-yi Zhu Zhen-ming hu ming-jie WANG Long-long LIU Hai-jun LIU College of Materials Science and Engineering Fuzhou University Chengdu Aircraft Industrial(Group)Co. Ltd.AVIC Fujian San ming Iron and Steel Group Co. Ltd. College of Materials Science and Engineering Fujian University of Technology

The influence of carbon content on the stacking fault energy （SFE） of Fe-20Mn-3Cu twinning-induced plasticity （TWIP） steel was investigated by means of X-ray diffraction peak-shift method and thermodynamic modeling. The experimental result indicated that the stacking fault probability decreases with increasing carbon addition, the SFE increases linearly when the carbon content in mass percent is between 0.23 M and 1.41%. The thermody namic calculation results showed that the SFE varied from 22.40 to 29.64 mJ ~ m 2 when the carbon content in mass percent changes from 0.23 % to 1.41%. The XRD analysis revealed that all steels were fully austenitic before and after deformation, which suggested that TWIP effect is the predominant mechanism during the tensile deformation process of Fe-20Mn-3Cu-XC steels.

关键词： stacking fault energy carbon content peak-shift method thermodynamic modeling TWIP steel

A new metabonomics method for simultaneous determination of EFAs and NEFAs in plasma using GC-MS and its application

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2009年第9期20卷 1103-1106页

作者： Li Da Han Qiong Lin Liang yi ming Wang Ping hu Guo An Luo School of Pharmaceutics East-China University of Science & Technology Shanghai 200237 China Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education) Department of Chemistry Tsinghua University Beijing 100084 China

A new metabonomics method was developed for simultaneous qualitative and quantitative analysis on esterified and nonesterified fatty acids （EFAs and NEFAs） in plasma. Merely 10 μL of plasma was required. The pretreatment of the sample was simple without disposing the protein. After simple extraction and derivation, 15 FAs in plasma were precisely quantified. Gas chromatography tandem mass spectrometry （GC-MS） was used in the study and the quantities of the analytes, which varied in abundance over three orders of magnitude. The established method showed good accuracy. The curve correlation coefficients were all above 0.997. The RSDs of precision for all compounds were below 15% and recoveries were all between 80 and 110%. PLS-DA modal was used in the data management. 2009 Guo An Luo. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

关键词： Metabonomics Fatty acids Quantification GC-MS PLS-DA

Synthesis and Drug Release Properties of Thermosensitive Poly(N-vinylacetamide-co-vinylacetate) Hydrogels

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2011年第2期27卷 334-338页

作者： YANG Li-he Chu Hong CHEN ming-qing hu Na ZHAO yi-fan School of Chemical and Material Engineering Jiangnan University Wuxi 214122 P. R. China

Thermosensitive poly[N-vinylacetamide-co-vinylacetate][P（NVA-co-VAc）] hydrogels were prepared via free radical copolymerization from hydrophilic NVA and hydrophobic VAc in the presence of butylenes-bis （N-vinylacetamide）（Bis-NVA） as crosslinker. Scanning electron microscopy（SEM） images reveal that the as-prepared hydrogels were of three-dimensional network with irregular cave structure. The prepared hydrogels with more NVA in the feed swelled faster and the swelling ratio of the hydrogels gradually decreased with temperature increasing from 10 °C to 60 °C. The dynamic swelling studies indicate that the swelling process of the hydrogels was controlled by diffusion of water molecules considered as Fickian-controlled case. The adsorption amount of model drug, sodium salicylate（SS） was higher in the hydrogels containing more NVA units, whose corresponding release could reach equilibrium in about 6 h.

关键词： Poly(N-vinylacetamide-co-vinylacetate) Therrnosensitive hydrogel Drug release