检索结果-南通市图书馆

Optimum Operation on Electric Vehicles Considering Battery Degradation in V2G System 36

在线全文

学校读者我要写书评

暂无评论

Optimum Operation on Electric Vehicles Considering Battery D...

Effective age of information in real-time wireless feedback control systems

第36届中国控制会议

作者： Qi li Jianxiao Zou liying li School of Automation Engineering University of Electronic Science and Technology of China

ISBN: (纸本)9781538629185

In vehicle-to-grid system（V2G）, a great number of electric vehicles（EVs） can form a massive energy storage to perform the operation of charging, discharging and providing frequency regulation for the grid. This process may lead to battery degradation of the EVs. In this paper, we propose to optimize the operation of EVs in each hour to maximize the user’s total revenue, where lithium battery is used for the EVs and the battery degradation is considered. Here, battery degradation includes two parts, one is the degradation caused by battery temperature during EVs’ charging and discharging;another is the degradation caused by the depth of discharge（DoD）. Considering the real-time electricity price, the optimum operation of each hour, i.e.,charging, discharging or frequency regulation, can be obtained by V2G control center. Simulation results are provided to demonstrate that an optimum operation in each hour can be obtained to maximize the users profit. It also shows that large charging or discharging rate, and DoD reduces the battery’s capacity and life cycle, which finally leads to the loss of user’s benefit.

关键词： Battery degradation electric vehicles(EVs) frequency regulation lithium battery optimum operation vehicle-to-grid system(V2G)

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2021年第2期64卷 86-99页

作者： Bo CHANG Burak KIZILKAYA liying li Guodong ZHAO Zhi CHEN Muhammad Ali IMRAN School of Engineering University of Glasgow National Key Laboratory on Communications University of Electronic Science and Technology of China (UESTC) Department of Mathematics Physics and Electrical EngineeringNorthumbria University

Ultra-reliable and low-latency communication（URLLC） is one of the most important scenarios in forthcoming fifth generation（5 G） cellular networks to ensure timely exchange of information and realize real-time wireless control. In URLLC, timely information update needs to be guaranteed since control performance, e.g., control cost and stability, is directly determined by timely control information *** this paper, we introduce an effective age of information（EAoI） to evaluate the timeliness of information update in control process. We consider the control process with two phases: sensor to controller phase and controller to actuator phase. We adopt first-generate-first-serve（FGFS） M/M/1/1 → M/M/1/2 and FGFS M/M/1/1;→ M/M/1/2;tandem queuing models to represent control process and we use finitestate Markov chains to describe control information updates. By studying state transitions, we calculate the average EAoI for both tandem queuing models. More importantly, we analyze throughput of wireless control systems and its relationship with average EAoI, which provides a guideline for URLLC system design in real-time feedback control systems. Simulation results show the advantage of using EAoI.

关键词： age of information communications feedback control queuing throughput URLLC

Basic fibroblast growth factor improves learning and memory deficits in a mouse model of vascular dementia: Associated with the role of free radicals clearance?

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2010年第13期5卷 1015-1019页

作者： Xian Qu Chunying li Chang Su Bing li liying Wang Basic Medical College of Beihua University Jilin 132013 Jilin Province China

BACKGROUND： Basic fibroblast growth factor （bFGF） exhibits neuroprotective functions, but the possible mechanisms of bFGF on vascular dementia remain unclear. OBJECTIVE： To explore the neuroprotective effects of bFGF on a mouse model of vascular dementia, with focus on oxidative damage. DESIGN, TIME AND SETTING： A randomized, controlled, animal experiment was performed at the Medical College of Beihua University from March to December 2008. MATERIALS： bFGF was purchased from Peprotech, USA. METHODS： A total of 80 healthy, Kunming mice were randomly assigned to control, sham-surgery, model, and bFGF groups. The model and bFGF groups were used to establish vascular dementia models by repetitive cerebral ischemia-reperfusion in a conscious state. In addition, bFGF group mice were intraperitoneally injected with bFGF （100 pg/kg） following model establishment, once a day for 7 consecutive days. MAIN OUTCOME MEASURES： The Morris water maze was used to determine the influence of bFGF on learning and memory abilities in vascular dementia mice. The pathomorphological changes in hippocampal CA1 neurons were observed by Nissl staining. Superoxide dismutase and malondialdehyde changes were analyzed using biochemical analysis methods. Annexin V-FITC/PI-double-labeled flow cytometry was used to detect neuronal apoptosis. RESULTS： Learning and memory functions in model mice significantly decreased, as characterized by prolonged latency and reduced time and number of platform crossings （P 〈 0.01, P 〈 0.05）. Superoxide dismutase activity was significantly reduced, malondialdehyde content was significantly increased （P 〈 0.01）, and hippocampal neuronal apoptosis was increased （P 〈 0.01） following vascular dementia, bFGF increased superoxide dismutase activity, decreased malondialdehyde content, and reduced hippocampal neuronal apoptosis （P 〈 0.01）, which resulted in improved learning and memory in mice with vascular dementia. CONCLUSION： bFGF improved learning and memory deficits in

关键词： basic fibroblast growth factor vascular dementia Morris water maze superoxide dismutase malondialdehyde neurodegenerative disease neural regeneration

Effect of groove shapes on mechanical properties of welded joints of ASTM4130 steel

在线全文

学校读者我要写书评

暂无评论

China Welding 2016年第2期25卷 40-46页

作者： li liying Han Tao College of Mechanical and Electronic Engineering China University of Petroleum Qingdao 26658

The 30 mm thick ASTM4130 steel pipe was fabricated by gas tungsten arc welding and shielded metal arc welding under quenched and tempered conditions. Whereafier, the mechanical properties of welded joints of both V groove and combination double V groove were measured, while the microstructure feature and fracture morphology of both welded joints were investigated. Moreover, the effect of groove shapes on the properties of welded joints was explored. The results show that the welding efficiency of the combination double V groove joint is as two times as that of the V groove joint. But the hardness and toughness of the heat-affected zone （HAZ） with combination double V groove can not satisfy the requirements. Also, the coarse grain heat-affected zone （CGHAZ） of the cap layer is mainly composed of granular bainite, tempered martensite and a small amount of carbon-free bainite, and the fractured swface of the fusion line is entirely dominated by the quasi-cleavage mode. That the mechanical properties of the combination double V groove are lower than that of the V groove lie in the penetration ratio, welding heat input, and the areas and distribution feature of brittle zones. The combination double V groove is not suitable for the fabricating of ASTM4130 steel.

关键词： ASTM4130 steel groove shape mechanical properties microstructure

The role of roof plate-specific spondins in liver homeostasis and disease

在线全文

学校读者我要写书评

暂无评论

liver Research 2022年第3期6卷 139-145页

作者： Le Yang Wenhui Yue Hang Zhang Yue Gao lin Yang liying li Department of Cell Biology Municipal Laboratory for Liver Protection and Regulation of RegenerationCapital Medical UniversityBeijingChina

As evolutionarily conserved signals,roof plate-specific spondins(R-spondins;RSPOs)are a family with four members(RSPO1e4)exerting distinctly different *** have five receptors and correlate with different signaling pathways through these receptors and then perform various ***,their best-known molecular function is the capacity to enhance WNT signaling pathways,which play critical roles in several processes.A recent study shows that RSPOs not only potentiate the WNT/beta(b)-catenin signaling pathway but are also involved in the WNT/planar cell polarity signaling *** influence liver homeostasis and the development of multiple liver ***1 increases cell proliferation,protects hepatocytes from injury,improves liver regenerative potential,and affects liver metabolic ***2 not only regulates proliferation-associated genes and promotes differentiation in the liver but also participates in liver fibrosis through the WNT/b-catenin signaling ***3 is a key determinant of proper liver function,such as promoting hepatocyte regeneration and maintaining liver ***3 is upregulated in liver fibrosis and livers of patients with nonalcoholic ***,RSPO2 and RSPO3 are confirmed as oncogenes and involved in the occurrence of liver *** role of RSPO4 in the liver remains *** this review,the structural and biochemical properties of RSPOs and their receptors and their roles in liver homeostasis and disease are summarized.

关键词： Roof plate-specific spondin(RSPO) Leucine-rich repeat-containing G-proteincoupled receptor(LGR) Zinc and ring finger 3(ZNRF3) Ring finger protein 43(RNF43) WNT signaling pathway liver homeostasis liver fibrosis liver cancer

SYNTHESIS OF NANOPOROUS SIliCA WITH INTERIOR COMPOSITE CELLS WITH SYNTHETIC BLOCK COPOLYPEPTIDE AS TEMPLATE

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 Science Bulletin 2006年第4期51卷 493-497页

作者： liU Yuping ZHOU Huijing SHEN Zhurui li liying ZHOU Xingdi SUN Pingchuan YUAN Zhongyong CHEN Tiehong li Baohui DING Datong Department of Materials Chemistry Key Laboratory of FunctionalPolymer Materials of Ministry of Education College of ChemistryNankai University Tianjin 300071 China College of Physics Nankai University Tianjin 300071 China

Nanoporous silica with unusual interior composite cells was synthesized with synthetic block copolypeptide Phe20-b-PBLG50 as template for the first time. Anilino-methyl triethoxy silane (AMTS) was used as an intermedium to interact with block co-polypeptide Phe20-b-PBLG50 through π-π interaction between the phenyl groups of block copolypeptide and those of AMTS. Meanwhile, AMTS co-condenses together with tetraethoxylsilane (TEOS) after hy-drolysis. The structure of composite vesicles due to the self-assembly of block copolypeptide in the or-ganic solvent was immobilized and transcribed by the formation of silica. The formation of nanopores could be ascribed to the secondary structure of block co-polypeptide and small molecular amine. Our results provide a new avenue to synthesize porous oxide materials with novel interior structures templated by the copolypeptide self-assembly under ambient con-ditions.

关键词：纳米多孔硅合成模板法 π-π交互作用自组装多肽

The Impacts of Highly Resourced Vocational Schools on Student Outcomes in China

在线全文

学校读者我要写书评

暂无评论

China & World Economy 2020年第6期28卷 125-150页

作者： Guirong li Jiajia Xu liying li Zhaolei Shi Hongmei Yi James Chu Elena Kardanova Yanyan li Prashant Loyalka Scott Rozelle International Center for Action Research on Education School of EducationHenan UniversityChina Henan University of Engineering China Freeman Spogli Institute Stanford UniversityUSA School of Advanced Agricultural Sciences Peking UniversityChina Higher School of Economics National Research UniversityRussia School of Education Henan UniversityChin Graduate School of Education Stanford UniversityUSA

Policymakers in developing countries have prioritized the mass expansion of vocational education and training(VET).This study examines whether the quality of VET in developing countries increases by investing greater resources per *** achieve this goal,we examine the impacts of attending model schools(which have far more resources per student)on a range of student cognitive,non-cognitive,and behavioral *** representative data from a survey of approximately 12,000 VET students from China,multivariate regression and propensity score matching analyses show that attending model vocational high schools do not benefit student outcomes,despite their substantially greater resources.

关键词： non-cognitive skills school expenditure student achievement vocational education and training

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

提前期可控下的供应链交易信用协调模型

计算机集成制造系统 2016年第8期22卷 2046-2052页

作者：李莉英王勇重庆交通大学理学院重庆400074 重庆大学经济与工商管理学院重庆400044

为研究可控提前期对供应链最优决策的影响,基于交易信用契约,研究了由单个供应商与单个零售商组成的两级供应链库存协调问题。假设补货提前期可控,得到分散式、集中式和协调模型中供应商与零售商的最优策略组合。研究表明:基于交易信用... 详细信息

为研究可控提前期对供应链最优决策的影响,基于交易信用契约,研究了由单个供应商与单个零售商组成的两级供应链库存协调问题。假设补货提前期可控,得到分散式、集中式和协调模型中供应商与零售商的最优策略组合。研究表明:基于交易信用和批发价格溢价的协调机制共同作用不但提高了整个供应链的绩效水平,而且实现了额外利润在供应商与零售商之间的合理分配;协调的批发价格随着零售商资金机会成本的增加而增加,随着供应商资金机会成本的增加而减少;交易信用契约的协调区间随着零售商资金机会成本的增加而增大,随着供应商资金机会成本的增加而减小。通过算例分析考察了需求标准差和单位缺货成本对供应链最优策略与系统利润的影响,结果表明,该模型不但提高了整个供应链的绩效水平,而且实现了额外利润在供应商与零售商之间的合理分配。

关键词：交易信用批发价格溢价提前期供应链协调

Reform Attempts in Teaching Methods on Metallurgical Technology Professional English

在线全文

学校读者我要写书评

暂无评论

Reform Attempts in Teaching Methods on Metallurgical Technol...