检索结果-南通市图书馆

维普期刊数据库博看期刊

Influence of channel/back-barrier thickness on the breakdown of AlGaN/GaN MIS-HEMTs

在线全文

学校读者我要写书评

暂无评论

Journal of Semiconductors 2018年第9期39卷 29-33页

作者： Jie Zhao Yanhui Xing Kai Fu Peipei zhang Liang Song Fu Chen Taotao Yang Xuguang Deng sen zhang Baoshun zhang Key Laboratory of Opto-Electronics Technology Ministry of Education Beijing University of Technology Beijing 100124China Key Laboratory of Nano Devices and Applications Suzhou Institute of Nano-Tech and Nano-Bionics CAS Suzhou 215123China Key Laboratory of RF Circuit and System Education Ministry Hangzhou Dianzi University Hangzhou 310018 China Tang Optoelectronics Equipment Co. Ltd Shanghai 201203 China Suzhou Powerhouse Electronics Co. Ltd Suzhou 215123 China

The leakage current and breakdown voltage of AlGaN/GaN/AlGaN high electron mobility transistors on silicon with different GaN channel thicknesses were *** results showed that a thin GaN channel was beneficial for obtaining a high breakdown voltage,based on the leakage current path and the acceptor traps in the AlGaN *** breakdown voltage of the device with an 800 nm-thick GaN channel was 926 V@1 m A/mm,and the leakage current increased slowly between 300 and 800 ***,the raising conduction band edge of the GaN channel by the AlGaN back-barrier lead to little degradation for sheet 2-D electron gas density,especially,in the thin GaN *** transfer and output characteristics were not obviously deteriorated for the samples with different GaN channel *** optimizing the GaN channel thickness and designing the Al GaN back-barrier,the lower leakage current and higher breakdown voltage would be possible.

关键词： AlGaN/GaN high electronic mobility transistors AlGaN back-barrier breakdown characteristics leakage current path Si substrate

A slotted floor acquisition multiple access based MAC protocol for underwater acoustic networks with RTS competition

在线全文

学校读者我要写书评

暂无评论

Frontiers of Information Technology & Electronic Engineering 2015年第3期16卷 217-226页

作者： Liang-fang QIAN sen-lin zhang Mei-qin LIU College of Electrical Engineering Zhejiang University

Long propagation delay, limited bandwidth, and high bit error rate pose great challenges in media access control （MAC） protocol design for underwater acoustic networks. A MAC protocol called slotted floor acquisition multiple access （slotted-FAMA） suitable for underwater acoustic networks is proposed and analyzed. This FAMA based protocol adds a time slot mechanism to avoid DATA packet collisions. However, slotted-FAMA is not suitable for dense networks since the multiple request-to-send （RTS） attempts problem in dense networks is serious and greatly limits the network throughput. To overcome this drawback, this paper proposes a slotted-FAMA based MAC protocol for underwater acoustic networks, called RC-SFAMA. RC-SFAMA introduces an RTS competition mechanism to keep the network from high frequency of backoff caused by the multiple RTS attempts problem. Via the RTS competition mechanism, useful data transmission can be completed successfully when the situation of multiple RTS attempts occurs. Simulation results show that RC-SFAMA increases the network throughput efficiency as compared with slotted-FAMA, and minimizes the energy consumption.

关键词： Underwater acoustic networks Medium access control (MAC) Request-to-send (RTS) competition Throughput Energy consumption

Mobile population dynamics and malaria vulnerability:a modelling study in the China-Myanmar border region of Yunnan Province,China

在线全文

学校读者我要写书评

暂无评论

Infectious Diseases of Poverty 2018年第1期7卷 355-365页

作者： Tian-Mu Chen Shao-sen zhang Jun Feng Zhi-Gui Xia Chun-Hai Luo Xu-Can Zeng Xiang-Rui Guo Zu-Rui Lin Hong-Ning Zhou Shui-sen Zhou Department of Malaria National Institute of Parasitic DiseasesChinese Center for Disease Control and Prevention207 Rui Jin Er RoadShanghai 200025People’s Republic of China WHO Collaborating Centre for Tropical Diseases 207 Rui Jin Er RoadShanghai 200025People’s Republic of China National Center for International Research on Tropical Diseases Ministry of Science and Technology207 Rui Jin Er RoadShanghai 200025People’s Republic of China Key Laboratory of Parasite and Vector Biology Ministry of Health207 Rui Jin Er RoadShanghai 200025People’s Republic of China Yunnan Institute of Parasitic Diseases PuerPeople’s Republic of China Yingjiang County Center for Disease Control and Prevention DehongPeople’s Republic of China

Background:The China-Myanmar border region presents a great challenge in malaria elimination in China,and it is essential to understand the relationship between malaria vulnerability and population mobility in this ***:A community-based,cross-sectional survey was performed in five villages of Yingjiang county during September ***-prick blood samples were obtained to identify asymptomatic infections,and imported cases were identified in each village(between January 2013 and September 2016).A stochastic simulation model(SSM)was used to test the relationship between population mobility and malaria vulnerability,according to the mechanisms of malaria ***:Thirty-two imported cases were identified in the five villages,with a 4-year average of 1 case/year(range:0-5 cases/year).No parasites were detected in the 353 blood samples from *** median density of malaria vulnerability was 0.012(range:0.000-0.033).The average proportion of mobile members of the study population was 32.56%(range:28.38-71.95%).Most mobile individuals lived indoors at night with mosquito *** SSM model fit the investigated data(χ2=0.487,P=0.485).The average probability of infection in the members of the population that moved to Myanmar was 0.011(range:0.0048-0.1585).The values for simulated vulnerability increased with greater population mobility in each ***:A high proportion of population mobility was associated with greater malaria vulnerability in the China-Myanmar border *** population-specific measures should be used to decrease the risk of malaria re-establishment in China.

关键词： Malaria Importation Vulnerability Mobile population Individual-based model

Analysis of Prognosis of 122 Colorectal Cancer Patients with Concurrent Liver Metastasis

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

Clinical oncology and cancer researeh 2009年第3期6卷 214-220页

作者： Jihui Luo Feng Gao sen zhang Lisheng Chen Jianfeng Yang Department of Colorectal Surgery the First Affiliated Hospital of Guangxi Medical University Nanning 530021 Guangxi Province China

OBJECTIVE To explore prognostic factors and treatmentchoices for colorectal cancer (CRC) patients with concurrent livermetastases (CLM).METHODS The data of the 122 CRC patients with CLM, whowere treated in our hospital from January 2000 to December 2005,were collected. Overall survival rate of the patients in our groupwas analyzed using Kaplan-Meier method, and the univariateand multivariate analyses of the 18 factors affecting the survivalrate, including clinicopathologic factors and treatment methods,were conducted using Log-rank test and Cox regression model(SPSS13.0).RESULTS The median survival time of the 122 patients withCRC was 13 months. The 1, 2, 3 and 5-year survival rate was52.46%, 24.59%, 12.30% and 3.28%, respectively. Univariateanalysis combined with Kaplan-Meier curve revealed that thefactors of prognosis included the size of the primary tumor, thelevels of differentiation, lymphatic status, cancerous ileus (CI),the number, size and distribution of liver metastases, extrahepaticinvolvement, the serum CEA level at diagnosis, treatmentmodality, the extent of primary resection, chemotherapeuticmodality and regimen. Multivariate analysis showed that CI,differentiation levels, serum CEA value at diagnosis and treatmentmodality were the independent prognostic factors of CRC patientswith *** For the CRC patients with CLM, poordifferentiation of the tumor and CI, as well as a high CEAlevel indicate an unfavorable prognosis. Treatment choice is ofspecial significance in treating the CRC patients with CLM, soactive radical excision of the primary tumor and liver metastasisis strongly recommended in the CRC patients with hepaticmetastasis alone. Interventional chemotherapy has advantagescompared with the whole-body chemotherapy via peripheral vein,and the regimen of systemic chemotherapy containing oxaliplatinis preferred.

关键词： colorectal cancer/primary synchronous liver metastases prognosis multivariate analysis univariate analysis.

Reverse Transcription Recombinase Polymerase Amplification Assays for Rapid Detection of Tick-Borne Encephalitis Virus Infection

在线全文

学校读者我要写书评

暂无评论

Virologica Sinica 2019年第3期34卷 338-341页

作者： Jia Jia Yuchang Li Xiaoyan Wu sen zhang Yi Hu Jing Li Tao Jiang Xiaoping Kang State Key Laboratory of Pathogen and Biosecurity Beijing Institute of Microbiology and EpidemiologyBeijing 100071China Center for Disease Control and Prevention of Shunyi District Beijing 101300China Graduate School Anhui Medical UniversityHefei 230032China

Dear Editor,Tick-borne encephalitis virus(TBEV)belongs to the genus Flavivirus within the family Flaviviridae and includes three subtypes:Siberian,European,and Far *** infects humans via tick bites;indeed,at least 10,000 human cases of encephalitis caused by TBEV are reported annually in Russia,China,and European countries(Banzhoff et al.2008;Carletti et al.2017).

关键词： Dear Editor Virus Infection Rapid Detection

The Life Course of a Long-Lasting Affection Medium:A Fieldwork Based on the Communication Practice of the Rural Loudspeakers in North China

在线全文

学校读者我要写书评

暂无评论

Cultural and Religious Studies 2022年第10期10卷 545-556页

作者： zhang sen QIU Qian China University of Political Science and Law BeijingChina

The loudspeakers played a crucial role in rural community during the COVID-19 pandemic,and had returned to the public with the help of short video ***,with the continued popularity of digital media,is the revival of the loudspeakers which belong to traditional media just a flash in the pan?What the historic process of return has the loudspeakers undergone?Based on these questions,the paper applies Bourdieu’s sense of practice theory,focuses on“habit”throughout,adopts the research methods of online ethnography and fieldwork,and conducts participant observation and targeted in-depth interviews in a village in North China for about nine *** study found that:(1)There is the lag of habit in the state’s handling of social relations in *** on rational habit,village cadres used the loudspeakers to manifest their physical presence and restructure their authority;the villagers,operating under perceptual habit,rationalized the presence of the loudspeakers through using the key words such as elders,nostalgia,and homesickness;(2)the loudspeakers was maintained under the habit of village cadres and ordinary villagers,and the outbreak of the epidemic made the loudspeakers as an habit truly“appearing”;(3)the young village cadres,on the other hand,acquired this habit through imitation,transposed the loudspeakers into the short video platform,and carried out different forms of experimentation and innovation,thus surpassing the previous forms of loudspeakers *** return of the loudspeakers is the result of the game of different *** a long-lasting affection medium,the loudspeakers,on the one hand,has become an important media scene and memory field indispensable to rural community,and on the other hand,the people living on this land have a deep attachment to the loudspeakers,which is indirectly transformed into the bearer of *** brings new inspiration for us to rethink the relationship between the traditional media and the new

关键词： loudspeakers sense of practice long-lasting affection medium life course

维普期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

混沌时间序列全局预测新方法——连分式法

物理学报 2005年第11期54卷 5062-5068页

作者：张森肖先赐电子科技大学电子工程学院

拓展了多项式逼近理论,利用连分式法建立了混沌时间序列非线性全局预测模型,此模型替代混沌序列的动力学方程,实现对其动力学特性分析,达到预测目的.理论分析和仿真实验表明,连分式法能够有效预测一些混沌序列,该方法预测精度高,并且能... 详细信息

拓展了多项式逼近理论,利用连分式法建立了混沌时间序列非线性全局预测模型,此模型替代混沌序列的动力学方程,实现对其动力学特性分析,达到预测目的.理论分析和仿真实验表明,连分式法能够有效预测一些混沌序列,该方法预测精度高,并且能得到显式的预测表达式.

关键词：混沌时间序列,全局预测,连分式混沌时间序列预测模型连分式力学特性分析混沌序列动力学方程逼近理论仿真实验预测精度

FRUCTOKINASE-LIKE PROTEIN 1 interacts with TRXz to regulate chloroplast development in rice

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2018年第2期60卷 94-111页

作者： Lei He sen zhang Zhennan Qiu Juan Zhao Wendan Nie Haiyan Lin Zhengge Zhu Dali Zeng Qian Qian Li Zhu State Key Laboratory of Rice Biology China National Rice Research Institute Hebei Key Laboratory of Molecular and Cellular Biology Hebei Normal University

Chloroplast genes are transcribed by the plastidencoded RNA polymerase（PEP） or nucleus-encoded RNA polymerase. FRUCTOKINASE-LIKE PROTEINS（FLNs） are phosphofructokinase-B（Pfk B）-type carbohydrate kinases that act as part of the PEP complex; however, the molecular mechanisms underlying FLN activity in rice remain ***, we identified and characterized a heat-stress sensitive albino（hsa_1） mutant in rice. Map-based cloning revealed that HSA_1 encodes a putative OsFLN_2. Here, we further demonstrated that knockdown or knockout of the OsFLN_1, a close homolog of HSA_1/OsFLN_2, considerably inhibits chloroplast biogenesis and the fln_1 knockout mutants, created by clustered regularly interspaced short palindromic repeats（CRISPR） and CRISPR-associate protein_9, exhibit severe albino phenotype and seedling lethality. Moreover, OsFLN_1 localizes to the *** two-hybrid, pull-down and bimolecular fluorescencecomplementation experiments revealed that OsFLN_1 and HSA_1/OsFLN_2 interact with THIOREDOXINZ（OsTRXz） to regulate chloroplast development. In agreement with this,knockout of OsTRXz resulted in a similar albino and seedling lethality phenotype to that of the fln_1 mutants. Quantitative reverse transcription polymerase chain reaction and immunoblot analysis revealed that the transcription and translation of PEP-dependent genes were strongly inhibited in fln_1 and trxz mutants, indicating that loss of OsFLN_1, HSA_1/OsFLN_2, or OsTRXz function perturbs the stability of the transcriptionally active chromosome complex and PEP activity. These results show that OsFLN_1 and HSA_1/OsFLN_2 contribute to chloroplast biogenesis and plant growth.

关键词： FLN FRUCTOKINASE-LIKE PROTEIN 1 interacts with TRXz to regulate chloroplast development in rice HSA PEP

CoFe_(2)O_(4) decorated graphene/C_(18)-functionalized mesoporous silica nanocomposites prepared for magnetic enrichment and electrochemical detection of promethazine in beef

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第3期35卷 208-213页

作者： Xingdong Yang Shi-Ming Ying sen zhang Jinxia Dai Wei Gao Tian-Qi Wang Jun-Qin Qiao Hong-Zhen Lian Li Mao State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry&Chemical Engineering and Centre of Materials AnalysisNanjing UniversityNanjing 210023China Ministry of Education(MOE)Key Laboratory of Modern Toxicology School of Public HealthNanjing Medical UniversityNanjing 211166China

Promethazine(PHZ)is used as a sedative in veterinary medicine,and its residue can threaten the health of *** electrochemical detection of PHZ is suitable method for application in the ***,the traditional electroanalysis is difficult to perform directly in meat samples due to matrix *** work integrates magnetic solid-phase extraction and differential pulse voltammetry for highly sensitive and selective determination of PHZ in beef and beef liver for the first ***_(2)O_(4)/graphene coated with C_(18)-functionalized mesoporous silica(MG@mSiO_(2)-C_(18))is synthesized as dispersed magnetic adsorbent to extract *** glassy carbon electrode modified with nitrogen-doped hollow carbon microspheres(HCM)attracts the MG@mSiO_(2)-C_(18)with PHZ,and directly detects the PHZ without elution ***@mSiO_(2)-C_(18)can separate PHZ to avoid the interference of impurities on following detection,and also concentrate PHZ on magnetic ***,the electrode modification with HCM can amplify the electrochemical signal of ***,the integrated PHZ determination method exhibits a wide linear range from 0.08μmol/L to 300μmol/L with a low limit of detection of 9.8 nmol/*** beef sample analysis presents excellent recovery,demonstrating that this protocol is promising for the rapid and onsite detection of PHZ in real meat samples。

关键词： Promethazine(PHZ) Drug residue Magnetic solid phase extraction Electrochemical detection Beef