检索结果-南通市图书馆

Weight distribution of Preparata codes over Z_4 and the construction of 3-designs

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2014年第6期57卷 1155-1162页

作者： li weixia SHEN Hao School of Mathematical Sciences Qingdao University Department of Mathematics Shanghai Jiao Tong University

In this paper,we calculate the number of the codewords(with Hamming weight 7)of each type in the Preparata codes over Z4,then give the parameter sets of 3-designs constructed from the supports of the codewords of each ***,we prove that the first two families of 3-designs are simple and the third family of the 3-designs has repeated blocks.

关键词： t-designs weight distribution Preparata codes over Z4

Safety Analysis of the Eco-Approach and Departure Application at a Signalized Corridor

在线全文

学校读者我要写书评

暂无评论

Tsinghua Science and Technology 2018年第2期23卷 157-171页

作者： weixia li Guoyuan Wu Yi Zhang Matthew J. Barth Department of Automation Tsinghua University Beijing 100084 China. Bourns College of Engineering-Center for Environmental Research and Technology (CE-CERT) University of California Riverside CA 92507 USA.

Various intelligent transportation systems and strategies for reducing vehicle fuel consumption and emissions have been developed. Energy and emissions could be reduced with the compromise of travel time in some environment-focused Connected Vehicle(CV) applications, which highlighted performance measures in terms of mobility and sustainability. Nevertheless, few studies have focused on safety assessment of such CV applications. In this study, a CV-based eco-driving application, namely, Eco-Approach and Departure(EAD), is selected as an example. A microscopic safety analysis tool, Surrogate Safety Assessment Model(SSAM), is utilized to assess the safety influence of EAD application in multiple scenarios. Further analysis is performed from two perspectives:(1) application users, i.e., EAD-equipped vehicles versus unequipped vehicles; and(2) traffic operators, i.e., overall traffic performance with and without the introduction of EAD. For each perspective, conflict statistics(e.g., frequency, time-to-collision distribution), overall and by type, are analyzed. Results indicate EAD is beneficial in improving the safety performance of equipped vehicles. The influence of EAD on overall traffic is scenario dependent, and a high penetration rate shows positive effects on network-wide safety benefits for most scenarios.

关键词： Eco-Approach and Departure(EAD) Surrogate Safety Assessment Model(SSAM) safety analysis conflict type Time-To-Collision(TTC)

Influence of Temperature and Humidity on the Incidence of Pulmonary Tuberculosis in Hainan,China,2004-2018

在线全文

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 2024年第9期37卷 1080-1085页

作者： weixia li Xiaodan Wang Bo Bi Jingjing Lu Zhengyuan li li Cao Hao Zhang School of Public Health Hainan Medical UniversityHaikou 571199Hainan China Tourism School Hainan Normal UniversityHaikou 571158Hainan China

According to the World Health Organization’s Global Tuberculosis Report 2023,there were 10.6 million cases of tuberculosis(TB)worldwide in 2022,an increase of 2.8%over 2021,and 1.3 million people had already died of the *** report also indicated that approximately 748,000 new cases occurred in China in 2022,accounting for 7.1%of the global total,with an incidence of 52/100,000.

关键词： Tuberculosis cases Incidence

MicroRNA encoded by the HSV-1 latency-associated transcript anti-apoptotic function in human mesenchymal stem cells

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2008年第11期53卷 1691-1698页

作者： ZHANG Jing li YongMei DU WenCai li GuangMing li weixia ZHU Ze Department of Medical Microbiolgy Tianjin Key Laboratory of Cellular and Molecular Immunology '13anjin Medical University Tianjin300070 China

Human mesenchymal stem cells (HMSCs) have emerged as a promising cell type for tissue repopulat-ing and for use as ex vivo gene delivery vehicles. Herpes simplex virus-1 (HSV-1) possesses many vector features, which make it especially suitable for HMSC applications. Here we performed real-time RT-PCR to detect the level of mature microRNA encoded by the HSV-1 latency-associated transcript (microRNA-LAT) in HMSCs cytoplasm with a specific stem loop reverse primer. Three small interfering RNAs (siRNAs) were chemically synthesized towards microRNA-LAT, TGF-β1 and SMAD3. The results demonstrate that HSV-1 and microRNA-LAT prevented HMSCs from undergoing cisplatin-induced apoptosis. In comparison with cells only treated with cisplatin, the apoptosis phenomenon with HSV-1 and microRNA-LAT were markedly reduced. The apoptosis rates of these two groups were both lower (Pling pathway components were by these means knocked down. Moreover, the levels of the mature microRNA-LAT were decreased in cis-platin-treated HMSCs. In conclusion, HSV-1 and microRNA-LAT exert their anti-apoptotic effect on HMSCs by down-regulation of the TGF-β signalling pathway. Thus HSV-1, having anti-apoptotic effect naturally encoded in its microRNA-LAT, is a good candidate to be developed for HMSC vector.

关键词：间叶细胞干细胞组织再生单纯疱疹病毒1 基因转录

The Signless Dirichlet Spectral Radius of Unicyclic Graphs

在线全文

学校读者我要写书评

暂无评论

Journal of Mathematical Research with Applications 2017年第3期37卷 262-266页

作者： Guangjun ZHANG weixia li School of Mathematics and Physics Qingdao University of Science and Technology School of Mathematics and Statistics Qingdao University

Let G be a simple connected graph with pendant vertex set ?V and nonpendant vertex set V;. The signless Laplacian matrix of G is denoted by Q（G）. The signless Dirichlet eigenvalue is a real number λ such that there exists a function f ≠ 0 on V（G） such that Q（G）f（u） = λf（u） for u ∈ V;and f（u） = 0 for u ∈ ?V. The signless Dirichlet spectral radiusλ（G） is the largest signless Dirichlet eigenvalue. In this paper, the unicyclic graphs with the largest signless Dirichlet spectral radius among all unicyclic graphs with a given degree sequence are characterized.

关键词： signless Dirichlet spectral radius unicyclic graph degree sequence

Differentiation of Hepatocellular Carcinoma from Hepatic Hemangioma and Focal Nodular Hyperplasia using Computed Tomographic Spectral Imaging

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Clinical and Translational Hepatology 2021年第3期9卷 315-323页

作者： weixia li Ruokun li Xiangtian Zhao Xiaozhu lin Yixing Yu Jing Zhang Kemin Chen Weimin Chai Fuhua Yan Department of Radiology Ruijin Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghaiChina Department of Radiology Guangdong General HospitalGuangdong Academy of Medical SciencesGuangzhouGuangdongChina Department of Nuclear Medicine Ruijin Hospital affiliated to Shanghai Jiao Tong University School of MedicineShanghaiChina Department of Radiology The First Affiliated Hospital of Soochow UniversitySuzhouJiangsuChina

Background and Aims:Hepatocellular carcinoma(HCC)is the most common primary hepatic *** study was designed to investigate the value of computed tomography(CT)spectral imaging in differentiating HCC from hepatic hemangioma(HH)and focal nodular hyperplasia(FNH).Methods:This was a retrospective study of 51 patients who underwent spectral multiple-phase CT at 40–140 keV during the arterial phase(AP)and portal venous phase(PP).Slopes of the spectral curves,iodine density,water density derived from iodine-and water-based material decomposition images,iodine uptake ratio(IUR),normalized iodine concentration,and the ratio of iodine concentration in liver lesions between AP and PP were measured or ***:As energy level decreased,the CT values of HCC(n=31),HH(n=17),and FNH(n=7)increased in both AP and *** were significant differences in IUR in the AP,IUR in the PP,normalized iodine concentration in the AP,slope in the AP,and slope in the PP among HCC,HH,and *** CT values in AP,IUR in the AP and PP,normalized iodine concentration in the AP,slope in the AP and PP had high sensitivity and specificity in differentiating HH and HCC from *** CT spectral data had higher sensitivity and specificity than conventional qualitative CT image analysis during the combined ***:Mean CT values at low energy(40–90 keV)and quantitative analysis of CT spectral data(IUR in the AP)could be helpful in the differentiation of HCC,HH,and FNH.

关键词： Hepatocellular carcinoma Hepatic hemangioma Focal nodular hyperplasia Computed tomography spectral imaging Spectral curve

Eco-budget-A Model of Urban Environmental Management

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

Ecological Economy 2005年第4期1卷 13-17页

作者： Hao weixia Teng li Wang Ziyan Research Center of Development in 21^st Century Dalian （Jniuersit） of Technology Dalian 116023 PR.China

In this paper, a new model of urban environmental resource management is introduced. The article analyzes the gap between urban environmental management and the management of economy and human resources. The significa... 详细信息

关键词： environmental management eco-budget

非蒸散型吸气剂维持红外焦平面探测器杜瓦组件工作真空度的性能与应用

在线全文

学校读者我要写书评

暂无评论

红外与激光工程 2018年第10期47卷 112-120页

作者：李建林李惟夏徐世春昆明物理研究所云南昆明650223 中国科学院大学北京100049

实漏、虚漏、出气和渗透等气体源引起封离真空杜瓦腔体压力升高,活性气体H_2、H_2O、CO占的份额较大,H_2的份额可达80%以上,NEG抽出活性气体获得和维持红外焦平面探测器杜瓦组件工作真空度。封离真空杜瓦寿命周期内产生的气体量与设计... 详细信息

实漏、虚漏、出气和渗透等气体源引起封离真空杜瓦腔体压力升高,活性气体H_2、H_2O、CO占的份额较大,H_2的份额可达80%以上,NEG抽出活性气体获得和维持红外焦平面探测器杜瓦组件工作真空度。封离真空杜瓦寿命周期内产生的气体量与设计制造技术水平和真空获得工艺能力有关,不正确使用St 172将导致NEG不能发挥最大效能。根据文献和工程实践经验,分析探讨在特定使用工况下NEG的抽气性能参数和激活与再激活条件对真空维持性能的影响,指出大多数用户不允许电再激活NEG修理、必须正确使用无颗粒St 172/NP和注意相关的问题。

关键词：非蒸散型吸气剂红外焦平面探测器封离真空杜瓦瓶激活可靠性

Unusual image findings of Wilson's disease with MSCT

在线全文

学校读者我要写书评

暂无评论

Unusual image findings of Wilson's disease with MSCT