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A Novel Method for Measuring Photo-Induced Birefringence of Photosensitive Fibers

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光学学报 2003年第S1期23卷 53-54页

作者： li Jiang, Dongsheng Zhang, lijun li, Shuzhong Yuan, Xiaoyi Dong (Institute of Modern Optics, Nankai University, Tianjin City, China, 300071 Institute of Modern Optics Nankai University Tianjin City China 300071

In this paper, we report a novel method for accurately measuring the photo-induced birefringence of photosensitive fiber by using Mach-Zehnder interferometer. The results indicate that the normalized birefringence can... 详细信息

关键词： for it in as of A Novel Method for Measuring Photo-Induced Birefringence of Photosensitive Fibers MZI

Investigation on the electrochemical behaviours of Mg_(2-x)Cr_xNi negative electrode

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Rare Metals 2003年第2期22卷 144-149页

作者： XUE Jianshe, WANG lijun, LUO Yuanhui, li Guoxun, DU Jun, HU Guangyong, and WANG ChaoqunGeneral Research Institute for Non-ferrous Metals, Beijing 100088, China (Received 2002-09-01) Generald Research Institute for Non-ferrous Metals 北京 100088

A series of Mg_(2-x)Cr_xNi alloy powder has been produced by combination ofsolid-state diffusion with mechanical grinding (MG). X-ray diffraction patterns show that the alloypowders have an amorphous structure and great increase in the specific surface. Electrochemicaldetection results indicate that the partial substitution of Mg by Cr in Mg_2Ni alloy improves thecycle life of this alloy greatly, which gets up to 100 cycles at 200 mA/g mass discharge current,keeping its mass discharge capacity over 200 mA.h/g. In the meanwhile, partial replacement of Mg byCr also increases the mass discharge capacity compared with Mg_2Ni alloy. With the increasing ofmass discharge current and content of Cr in Mg_(2-x)Cr_xNi, the cycle life of the alloys areincreased and the decay of mass discharge capacity slows down.

关键词： electrochemistry hydrogen storage alloy Ni-MH battery mechanicalgrinding Mg_2Ni

Sino-foreign Comparative Analysis of Environmental Compensation System

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Sino-foreign Comparative Analysis of Environmental Compensat...

Dual-Schottky-junctions coupling device based on ultra-longβ-Ga_(2)O_(3)single-crystal nanobelt and its photoelectric properties

The 2011 International Symposium on Applied Economics, Business and Development (ISAEBD 2011)

作者： Yanli li lijun li Jinghui Hu School of Economics and Management Shijiazhuang Tiedao University

This paper want to introduce the situations of environmental compensation in western countries, so that China can do it better. This paper compared and analysed the concept, theory, understanding and practice of environmental compensation in China and western countries. We consider that the western Payment for Environmental Services generally had more solid theoretical foundation and legal basis, and domestic research has made a series of achievements, compared with the international research on the mechanism of the environmental compensation, the studies in China should do much more.

关键词： environmental compensation ecological payment comparative analysis environmental capacity

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Journal of Semiconductors 2024年第5期45卷 90-98页

作者： Haifeng Chen Xiaocong Han Chenlu Wu Zhanhang liu Shaoqing Wang Xiangtai liu Qin Lu Yifan Jia Zhan Wang Yunhe Guan lijun li Yue Hao Key Laboratory of Advanced Semiconductor Devices and Materials School of Electronic EngineeringXi’an University of Posts andT elecommunicationsXi’an 710121China State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology School of MicroelectronicsXidian UniversityXi'an 710071China

High qualityβ-Ga_(2)O_(3)single crystal nanobelts with length of 2−3 mm and width from tens of microns to 132μm were synthesized by carbothermal reduction *** on the grown nanobelt with the length of 600μm,the dual-Schottky-junctions coupling device(DSCD)was *** to the electrically floating Ga_(2)O_(3)nanobelt region coupling with the double Schottky-junctions,the current I_(S2)increases firstly and rapidly reaches into saturation as increase the voltage V_(S2).The saturation current is about 10 pA,which is two orders of magnitude lower than that of a single *** the case of solar-blind ultraviolet(UV)light irradiation,the photogenerated electrons further aggravate the coupling physical mechanism in device.I_(S2)increases as the intensity of UV light *** the UV light of 1820μW/cm^(2),I_(S2)quickly enters the saturation *** V_(S2)=10 V,photo-to-dark current ratio(PDCR)of the device reaches more than 104,the external quantum efficiency(EQE)is 1.6×10^(3)%,and the detectivity(D*)is 7.5×10^(12)*** addition,the device has a very short rise and decay times of 25−54 ms under different positive and negative *** shows unique electrical and optical control characteristics,which will open a new way for the application of nanobelt-based devices.

关键词： β-Ga_(2)O_(3)nanobelt carbothermal reduction UV light dual-Schottky coupling device

Quantization of the band at the surface of charge density wave material 2H-TaSe_(2)

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Chinese Physics B 2021年第4期30卷 106-112页

作者： Man li Nan Xu Jianfeng Zhang Rui Lou Ming Shi lijun li Hechang Lei Cedomir Petrovic Zhonghao liu Kai liu Yaobo Huang Shancai Wang Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices Renmin University of ChinaBeijing 100872China Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201204China Institute of Advanced Studies Wuhan UniversityWuhan 430072China Swiss light Source Paul Scherrer InstituteCH-5232 VilligenSwitzerland Chongqing Technology and Busineee University Chongqing 400067China Condensed Matter Physics and Materials Science Department Brookhaven National LaboratoryUptonNY 11973USA State Key Laboratory of Functional Materials for Informatics and Center for Excellence in Superconducting Electronics SIMITChinese Academy of SciencesShanghai 200050China

By using angle-resolvea photoemission spectroscopy(ARPES) combined with the first-principies electronic structure calculations,we report the quantized states at the surface of a single crystal 2 H-TaSe_(2).We have observed sub-bands of quantized states at the three-dimensional Brillouin zone center due to a highly dispersive band with light effective mass along k_(z) *** quantized sub-bands shift upward towards E_(F) while the bulk band at Γ shifts downward with the decrease of temperature across charge density wave(CDW) *** band shifts could be intimately related to the *** neither the two-dimensional Fermi-surface nesting nor purely strong electron-phonon coupling can explain the mechanism of CDW in 2 H-TaSe_(2),our experiment may ignite the interest in understanding the CDW mechanism in this family.

关键词： angle-resolved photoemission spectroscopy transition metal dichalcogenide TaSe_(2)

The evolution of resistance gene in plants

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Journal of Northeast Agricultural University(English Edition) 2007年第1期14卷 43-48页

作者： BEN Haiyan liU Xuemin li lijun liU li College of Agriculture Northeast Agricultural University Harbin 150030 China Institute for the Control of Agro-chemicals of Heilongjiang Harbin 150090 China Determination Centre for the Agro-products Quality of Heilongjiang Harbin 150090 China

Resistance genes enable plants to fight against plant pathogens. Plant resistance genes （R gene） are organized complexly in genome. Some resistance gene sequence data enable an insight into R gene structure and gene evolution. Some sites like Leucine-Rich Repeat （LRR） are of specific interest since homologous recombination can happen. Crossing over, transposon insertion and excision and mutation can produce new specificity. Three models explaining R gene evolution were discussed. More information needed for dissection of R gene evolution though some step can be inferred from genetic and sequence analysis.

关键词： resistance genes evolution models resistance gene structure

Clinical implications and prognostic value of single and combined biomarkers in endometrial carcinoma

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Chinese Medical Journal 2014年第8期127卷 1459-1463页

作者： li Mingzhu Zhao lijun Shen Danhua li Xiaoping Wang Jianliu Wei lihui Department of Obstetrics and Gynecology Peking University People's Hospital Beijing 100044 China

Background Endometrial carcinoma is one of the most common gynecological cancers and the incidence has been increasing. This study was to identify the relationship of estrogen receptor （ER）, progestrone receptor （PR）, P53 protein, Ki-67 and phosphatase and tensin homolog deleted on chromosome ten （PTEN） with endometrial carcinoma, the assessment of these biomarkers and their association with clinicopathological parameters was performed. Methods A total of 198 cases of primary endometrial carcinoma were investigated for ER, PR, Ki-67, P53, and PTEN antigens by imrnunohistochemical methods. The association of these markers with age, menopause status, histological type, FIGO stage, grading, depth of invasion, lymph node involvement and serum tumor marker was examined. Results The percentages of Ki-67- and P53-negative endometrial tumors were significantly higher in ER-positive compared with ER-negative tumors （both P=0.000）. The same trend was evident with PR status. The percentage of PTEN-positive tumors was significantly higher in PR-positive compared with PR-negative tumors （P=0.021）, but was no difference in tumors with different ER status. There was no clear association between PTEN positivity and clinicopathological parameters except more relevance with endometrioid histotype （P=0.013）. There was a statistically significant difference in the distribution of the different combined biological factors examined in disease-free survival. Conclusions ER and PR status were significant predictors with staging, grading and recurrence. P53 and Ki-67 expression were inversely correlated with both ER and PR expression and have more aggressive clinicopathological features. PTEN expression was inversely correlated with PR expression but not with ER expression. The combined type of ER＋PR＋P53-PTEN＋ was in the majority in endometrial cancer and seemed to be related to better clinical outcome. The combination of ER-PR-P53＋PTEN- represented the worst disease-free survival and was s

关键词： endometrial carcinoma immunohistochemistry clinical factors biomarkers

Discussion on the Self-maintenance and Support mode of Training Equipment in Higher Vocational Colleges

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International Journal of Technology Management 2013年第3期 11-13页

作者： Bingyi Huang lijun li Hongxiu Meng Xingtai Polytechnic College XingtaiHebei054035 China

University teaching and research equipment maintenance costs, rising with the rapid development of the school. Equipment as a teaching resource, should give full play to its role in the efficiency at the same time, from quality improve equipment management, reduce material consumption, two aspects of efforts to reduce maintenance costs, reduce maintenance expenses. This article by the necessity of self- maintenance, feasibility analysis and establish a competitive mechanism, and that this is a feasible way out equipment maintenance work of vocational colleges need to adapt to the situation.

关键词： Higher Vocational Colleges Self-maintenance Training Equipment

Discussion on the Self-maintenance and Support mode of Training Equipment in Higher Vocational Colleges

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International Journal of Technology Management 2014年第9期 23-25页

作者： Bingyi Huang lijun li Hongxiu Meng Xingtai Polytechnic College XingtaiHebei054035 China

关键词： Higher Vocational Colleges Self-maintenance Training Equipment