检索结果-南通市图书馆

An applicable calorimetric method for measuring AC losses of 2G HTS wire using optical FBG

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2015年第3期58卷 545-550页

作者： WANG YinShun ZHOU WeiWei DAI jingshu State Key Laboratory of New Energy Power System North China Electric Power University Institute of Electrical Engineering Chinese Academy of Sciences Beijing Key Laboratory of High Voltage & Electromagnetic Compatibility North China Electric Power University

We present a new calorimetric method for measuring alternative current(AC)losses of high-temperature superconducting(HTS)tapes by optical fiber Bragg grating(FBG),which is particularly well suited for the AC loss measurement of Re BCO wires,so-called the second generation(2G)HTS *** with conventional calorimetric methods,the suggested method is both free of electromagnetic disturbance,magnetic field,and fast as well as ***-field AC losses are measured by the optical FBG method and the conventional lock-in-amplifier(LIA)technique,*** results show that the measured AC loss is in good agreement with those measured by the electric method,thus the presented calorimetric method would be available for measuring the AC loss of 2G wire and is expected to be generalized for the measurement of AC loss or thermal performances of HTS bulk.

关键词： AC losses calorimetric method 2G HTS wire calibration optical fiber Bragg grating(FBG)

Silicon nanophotonics for on-chip light manipulation

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2018年第10期27卷 46-57页

作者： jingshu Guo Daoxin Dai Center for Optical and Electromagnetic Research State Key Laboratory for Modern Optical InstrumentationCollege of Optical Science and EngineeringZhejiang UniversityHangzhou 310058China

The field of silicon nanophotonics has attracted considerable attention in the past decade because of its unique advantages,including complementary metal–oxide–semiconductor（CMOS） compatibility and the ability to achieve an ultra-high integration density. In particular, silicon nanophotonic integrated devices for on-chip light manipulation have been developed successfully and have played very import roles in various applications. In this paper, we review the recent progress of silicon nanophotonic devices for on-chip light manipulation, including the static type and the dynamic type. Static onchip light manipulation focuses on polarization/mode manipulation, as well as light nanofocusing, while dynamic on-chip light manipulation focuses on optical modulation/switching. The challenges and prospects of high-performance silicon nanophotonic integrated devices for on-chip light manipulation are discussed.

关键词： silicon nanophotonics polarization mode manipulation nanoplasmonics optical modulator optical switch.

IUKF neural network modeling for FOG temperature drift

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2013年第5期24卷 838-844页

作者： Feng Zha Jiangning Xu jingshu Li Hongyang He Department of Navigation Engineering Naval University of Engineering

A novel neural network based on iterated unscented Kalman filter （IUKF） algorithm is established to model and com- pensate for the fiber optic gyro （FOG） bias drift caused by temperature. In the network, FOG temperature and its gradient are set as input and the FOG bias drift is set as the expected output. A 2-5-1 network trained with IUKF algorithm is established. The IUKF algorithm is developed on the basis of the unscented Kalman filter （UKF）. The weight and bias vectors of the hidden layer are set as the state of the UKF and its process and measurement equations are deduced according to the network architecture. To solve the unavoidable estimation deviation of the mean and covariance of the states in the UKF algorithm, iterative computation is introduced into the UKF after the measurement update. While the measure- ment noise R is extended into the state vectors before iteration in order to meet the statistic orthogonality of estimate and mea- surement noise. The IUKF algorithm can provide the optimized estimation for the neural network because of its state expansion and iteration. Temperature rise （-20-20℃） and drop （70-20℃） tests for FOG are carried out in an attemperator. The temperature drift model is built with neural network, and it is trained respectively with BP, UKF and IUKF algorithms. The results prove that the proposed model has higher precision compared with the back- propagation （BP） and UKF network models.

关键词： fiber optic gyro (FOG) temperature drift neural net- work iterated unscented Kalman filter (IUKF).

Synthesis and Crystal Structure of 4-Salicyli deneamino-3-methyl-1,2,4-triazol-5-thione

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2003年第5期22卷 529-532页

作者： WENLi-Rong LIGuo-Qiang LIMing jingshu-Xia ZHANGShu-Sheng CollegeofLifeScienceandPharmacenticalEngineering NanjingUniversityofTechnologyNanjing210009China CollegeofChemistryandMoleculeEngineering QingdaoUniversityofScienceandTechnologyQingdao266042China NationalLaboratoryofAppliedOrganicChemistry LanzhouUniversityLanzhou730000China

The crystal structure of 4-salicylideneamino-3-methyl-1,2,4-triazol-5-thione 1 (C10H10N4OS, Mr = 234.28) has been determined by single-crystal X-ray diffraction method. The crystal belongs to monoclinic, space group P21/n with a = 12.697(3), b = 7.4072(15), c = 12.750(3) , b = 117.68(3), V = 1061.85(4) 3, Z = 4, Dc = 1.465 g/cm3, m = 0.288 mm-1 and F(000) = 488. R = 0.0584 and wR = 0.1642 for 2660 unique reflections with 2130 observed ones (I > 2s(I)). The results confirmed that the configuration of the title compound at the azomethine C=N bond is E and 1 can be assigned as the thione tautomeric form. All atoms of the title compound are essentially coplanar.

关键词： salicylideneamino-3-methyl-1,2,4-triazol-5-thione crystal structure synthesis

On the Fractional Derivatives with an Exponential Kernel

在线全文

学校读者我要写书评

暂无评论

Communications on Applied Mathematics and Computation 2023年第4期5卷 1655-1673页

作者： Enyu Fan jingshu Wu Shaoying Zeng Department of Mathematics Shanghai UniversityShanghai200444China

The present article mainly focuses on the fractional derivatives with an exponential kernel(“exponential fractional derivatives”for brevity).First,several extended integral transforms of the exponential fractional derivatives are proposed,including the Fourier transform and the Laplace ***,the L2 discretisation for the exponential Caputo derivative with a∈(1,2)is *** estimation of the truncation error and the properties of the coefficients are *** addition,a numerical example is given to verify the correctness of the derived L2 discrete formula.

关键词： Exponential fractional derivative Integral transform L2 discretisation Truncation error

Efficient Preference Clustering via Random Fourier Features

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

Big Data Mining and Analytics 2019年第3期2卷 195-204页

作者： jingshu Liu Li Wang Jinglei Liu College of Data Science Taiyuan University of TechnologyJinzhong 030600China School of Computer and Control Engineering Yantai UniversityYantai 264005China

Approximations based on random Fourier features have recently emerged as an efficient and elegant method for designing large-scale machine learning *** approaches using the Nystr?m method,which randomly samples the training examples,we make use of random Fourier features,whose basis functions(i.e.,cosine and sine)are sampled from a distribution independent from the training sample set,to cluster preference data which appears extensively in recommender ***,we propose a two-stage preference clustering *** this framework,we make use of random Fourier features to map the preference matrix into the feature matrix,soon afterwards,utilize the traditional k-means approach to cluster preference data in the transformed feature *** with traditional preference clustering,our method solves the problem of insufficient memory and greatly improves the efficiency of the *** on movie data sets containing 100000 ratings,show that the proposed method is more effective in clustering accuracy than the Nystr?m and k-means,while also achieving better performance than these clustering approaches.

关键词： random Fourier features matrix decomposition similarity matrix Nystrom method preference clustering

PROTECTION OF MALE SEXUAL RIGHTS IN THE CRIME OF RAPE

在线全文

学校读者我要写书评

暂无评论

Frontiers of Law in China-Selected Publications from Chinese Universities 2014年第2期9卷 252-275页

作者： DONG jingshu WANG Zhendong School of Law Renmin University of China Beijing China School of Law Renmin University of China Beijing China

Crimes relevant to sexual offence in the current Criminal Law of the PRC, such as the crime of rape, the crime of forcible molestation and humiliation of women, the crime of indecency with a child, establish a relatively close net for protecting female sexual rights. However, the protection of male sexual rights is surprisingly neglected or disregarded. In current China, sexual offences against males （including sexual offence against a male by male and sexual offence against a male by female） are getting worse. Unfortunately, male victims of sexual offences cannot seek for legal remedy due to the lack of legal provisions. In theory, the Criminal Law needs to bring in the protection of male sexual rights. This thesis will focus on the issue relevant to sexual offences against males on the crime of rape. The authors will present increasing evidence of sexual offences against males and explore the reasons. We will analyze the necessity of amending the provisions of the crime of rape based on theoretical and practical research, and learn from the advantages of legislations of different times and places in China and other countries. We will conclude with suggestions for amending the current Criminal Law about the crime of rape in order to fill up the gap in legal protection of male sexual rights in China.

关键词：

A preliminary application of dental cementum incremental analysis to determine the season-of-death of equids from the Xujiayao site,China

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

Science China Earth Sciences 2017年第6期60卷 1183-1188页

作者： LI jingshu ZHANG ShuangQuan Henry T. BUNN Akshay SARATHI GAO Xing Key Laboratory of Vertebrate Evolution and Human Origins Institute of Vertebrate Paleontology and Paleoanthropology Chinese Academy of Sciences Beijing 100044 China University of Chinese Academy of Sciences Beijing 100049 China University of Wisconsin-Madison Department of Anthropology Madison WI53706 United States

Seasonality study of Paleolithic archaeological faunal assemblages is important for reconstructing modes of animal death and ancient hominin strategies for prey acquisition. The dental cementum of animal teeth records the season of an individual animal in which it died, providing the necessary evidence for determining any patterns in season of death. This article presents the procedure and preliminary results of the application of cementum incremental analysis to equid teeth, which comprise the dominant component of the fauna from the Xujiayao Site—an early Late Pleistocene archaeological site in China. Results show multi-seasonal use in both the upper and lower layers of this site. Furthermore, attention is given to the method's future application in seasonality studies at Paleolithic archaeological sites in China.

关键词： Cementum Analysis Seasonality Paleolithic Xujiayao site Zooarchaeology

SILENT CHANGES： TRANSSEXUALS＇ RIGHT TO MARRY IN CHINA＇S MAINLAND AND HONG KONG

在线全文

学校读者我要写书评

暂无评论

Frontiers of Law in China-Selected Publications from Chinese Universities 2016年第3期11卷 433-444页

作者： GUO Xiaofei ZHU jingshu School of Law China University of Political Science and Law Beijing 100088 China Grotius Center of International Legal Studies Leiden University Leiden the Netherlands

In comparison to the arduous process of rights advocacy in Hong Kong, transsexuals in China＇s mainland achieved their right to marry via some ＂silent changes＂ there was no legal activism from transsexual communities, no debates or hearings in the legislature, and no landmark judgments made by the judiciary. From a perspective of comparative law, transsexuals＇ right It endeavors to dis this article attempts to analyze the legal changes regarding to marry in China＇s mainland in light of the struggles in Hong Kong. cuss to what extent the seemingly ＂smooth＂ and ＂unintended＂ way of opening up marriage to transsexuals in China＇s mainland could be beneficial to trans rights and equality in general.

关键词： transgender rights sex reassignment surgery same-sex marriage comparativelaw colonization of lifeworld