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132篇 您的检索式:作者名="Yixin Yu"
    题名 作者 年代 出处 被引量
1Thick-skinned Contractional Salt Structures in the Kuqa Depression,the Northern Tarim Basin:Constraints from Physical Experiments显示文摘摘要:脸皮厚的 contractional 盐结构广泛地在西方的 Kuqa 消沉被开发,北 Tarim 盆。为了理解管理这些的发展的机制,组织,物理实验被进行,结果证明他们被地下室差错并且形成 paleo 高举和地下室斜坡的活动大部分管理。在这研究的模型材料是干燥的沙,矿脂和 plasticene (或难泡沫) ,分别地模仿 suprasalt,盐,和 subsalt 层。实验证明由于地下室差错并且形成 paleo 高举的活动,盐身体通常在被预先退出的边界差错抑制的 paleo 高举的中间的顶上显著地积累并且变厚。大规模戳差错和盐越过水坝落下的水的发展被地下室赞成与更大的剧降泼出。实验也断定因为盐层的存在,那微分结构的变丑能发生在 subsalt 和 suprasalt 层之间。他们的几何学和结构的高度的地点是不同的,尽管有高举的区域的大类似。穿透的盐挤入构造没在实验被观察,它显示弄短的 contractional 有效地不加速盐挤入构造的发展。YU Yixin TANG Liangjie YANG Wenjing JIN Wenzheng PENG Gengxin LEI Ganglin 2008Acta Geologica Sinica(English Edition)2008,82,2:15
2Probabilistic steady-state and dynamic security assessment of power transmission system显示文摘Two-level system model based probabilistic steady-state and dynamic security assessment model is introduced in this paper.Uncertainties of nodal power injection caused by wind power and load demand,steady-state and dynamic security constraints and transitions between system configurations in terms of failure rate and repair rate are considered in the model.Time to insecurity is used as security index.The probability distribution of time to insecurity can be obtained by solving a linear vector differential equation.The coefficients of the differential equation are expressed in terms of configuration transition rates and security transition probabilities.The model is implemented in complex system successfully for the first time by using the following effective measures:firstly,calculating configuration transition rates effectively based on component state transition rate matrix and system configuration array;secondly,calculating the probability of random nodal power injection belonging to security region effectively according to practical parts of critical boundaries of security region represented by hyper-planes;thirdly,locating non-zero elements of coefficient matrix and then implementing sparse storage of coefficient matrix effectively;finally,calculating security region off-line for on-line use.Results of probabilistic security assessment can be used to conduct operators to analyze system security effectively and take preventive control.Test results on New England 10-generators and 39-buses power system verify the reasonableness and effectiveness of the method.LIU YanLi YU YiXin 2013Science China(Technological Sciences)2013,56,5:13
3Security value based expansion planning of power system with integration of large-scale wind power显示文摘Concerning the integration of large-scale wind power,an integrated model of generation and transmission expansion planning is proposed based on the assessment of the value of steady state and dynamic security.In the assessment of security value,the unit commitment simulation based on the predicted hourly load and wind power output data in the planning horizon is used to evaluate the costs of preventive control,emergency control and social losses due to the uncertainty of load and wind power.The cost of preventive control consists of the fuel cost of power generation,the environmental cost and the load shedding cost.This not only provides a systematic method of security assessment of power system expansion planning schemes,but also broadens the perspective of power system planning from the technology and economic assessment to the measure of the whole social value.In the assessment process,the preventive control and emergency control of cascading failures are also presented,which provides a convincing tool for cascading failure analysis of planning schemes and makes the security assessment more comprehensive and reasonable.The proposed model and method have been demonstrated by the assessment of two power system planning schemes on the New England 10-genarator 39-bus System.The importance of considering the value of security and simulating hourly system operation for the planning horizon,in expansion planning of power system with integration of large-scale wind power,has been confirmed.YU YIXin WANG JingRan LV XiaoYang 2012Science China(Technological Sciences)2012,55,7:11
4Tectonic Evolution of the Middle Frontal Area of the Longmen Mountain Thrust Belt,Western Sichuan Basin,China显示文摘由分析平衡的生气的节和 Longmen 山戳带的沉淀历史,中国,我们断定它经历了五个构造阶段:(1 ) 形成阶段(T 3 x ) Longmen 的缩影,山,早 Indosinian 运动,和 Anxian 构造运动创造了 Longmen 山;(2 ) 稳定的构造阶段(更弱的构造运动导致了 Longmen 山戳带的 J 1) 稍微正在被高举并且稍微减退低岬盆;(3 ) 强烈构造阶段(J2.3 ) ,也就是早 Yanshan 运动;(4 ) 连续构造运动(K-E ) ,也就是迟了的 Yanshan 运动和早喜玛拉雅的运动;并且(5 ) Longmen 山(N-Q ) 的形成,也就是晚喜玛拉雅的运动。在那些构造变丑阶段期间, Anxian 运动和喜玛拉雅的运动在 Longmen 山的形成起了重要作用。喜玛拉雅的运动影响了 Longmen 山大多数;阶层强烈地推进了并且严重地被侵蚀。因为一些越过水坝落下的水被推,在 Longmen 山戳带的中间的部分有某 klippes 在以后向东南构造变丑。JIN Wenzheng TANG Liangjie YANG Keming WAN Guimei Lü Zhizhou YU Yixin 2009Acta Geologica Sinica(English Edition)2009,83,1:10
5Theory and Method of Power System Integrated Security Region Irrelevant to Operation States:An Introduction显示文摘How to comprehensively consider the power flow constraints and various stability constraints in a series of power system optimization problems without affecting the calculation speed is always a problem.The computational burden of probabilistic security assessment is even more unimaginable.In order to solve such problems,a security region(SR)methodology is proposed,which is a brand-new methodology developed on the basis of the classical point-wise method.Tianjin University has been studying the SR methodology since the 1980s,and has achieved a series of original breakthroughs that are described in this paper.The integrated SR introduced in this paper is mainly defined in the power injection space,and includes SRs to ensure steady-state security,transient stability,static voltage stability,and smalldisturbance stability.These SRs are uniquely determined for a given network topology(as well as location and clearing process for transient faults)and given system component parameters,and are irrelevant to operation states.This paper presents 11 facts and related remarks to introduce the basic concepts,composition,dynamics nature,and topological and geometric characteristics of SRs.It also provides a practical mathematical description of SR boundaries and fast calculation methods to determine them in a concise and systematic way.Thus,this article provides support for the systematic understanding,future research,and applications of SRs.The most critical finding on the topological and geometric characteristics of SRs is that,within the scope of engineering concern,the practical boundaries of SRs in the power injection space can be approximated by one or a few hyperplanes.Based on this finding,the calculation time for power system probabilistic security assessment(i.e.,risk analysis)and power system optimization with security constraints can be decreased by orders of magnitude.Yixin Yu Yanli Liu Chao Qin Tiankai Yang 2020Engineering2020,6,7:10
61-Neighbour knapsack problem and prospective greedy algorithm of intentional islanding in active distribution network显示文摘A connected and undirected graph model of active distribution networks with considering the function of interconnecting switches is constructed in this paper.Based on this model,the island partition problem of active distribution networks can be described as a 1-neighbour knapsack problem.An effective heuristic algorithm named prospective greedy algorithm is then proposed to solve this problem.Case studies on PG&E 69-bus network show the validity of the proposed model and algorithm.YU YiXin MA ShiQian 2014Science China(Technological Sciences)2014,57,3:9
7Challenges and R&D opportunities of smart distribution grids in China显示文摘In this paper,5 investigations on the current states of power distribution grids in China have been introduced that cover the surveys of the practical distribution asset utilization,the simultaneity factor of feeder loading,the load compositions and characteristics,the urban reliability and the integration of distributed generations of renewable resources.Based on the survey results in the investigations,12 Facts are clearly presented.It shows that the challenges to modernize the distribution grids in China are to improve the asset utilization rates,the electricity efficiencies and the reliability of distribution systems,as well as to integrate increasing amount of variable distributed renewable resources.Furthermore based on the challenges,8 R&D opportunities have been identified.YU YiXin ZENG Yuan LIU Hong SUN Bing 2014Science China(Technological Sciences)2014,57,8:8
8A novel optimization method of transient stability emergency control based on practical dynamic security region (PDSR) of power systems显示文摘This paper proposes a novel optimization method of transient stability emergency control based on a new concept of the so-called extended practical dynamic security region (EPDSR) defined in this paper and four experiential laws about the EPDSRs found from a number of studies in real power systems. In this method, the effect of a control action is represented by the displacement of EPDSRs critical hyper-plane boundary in the direction of its outer normal vector. If an unstable contingency occurs, appropriate emergency control actions are triggered so that the enlarged EPDSR can cover the current operating point. Based on these ideas, a mathematics model of emergency control strategy is developed for minimizing its total cost and guaranteeing power system transient stability. The simulation results on the 10-generator, 39-bus New-England Test System as well as other real power systems have shown the validity of this method.YU Yixin LIU Hui ZENG Yuan 2004Science China(Technological Sciences)2004,47,3:7
9Differential Tectonic Deformation of the Longmen Mountain Thrust Belt,Western Sichuan Basin,China显示文摘地调查和地震的节解释证明 Longmen 山戳带有明显的微分变丑:带状配列,分割和层化。带状配列意味着那,从 NW 到 NE, Longmen 山戳带能被划分成 Songpan-Garz ê构造的带,可锻的变丑带,基础深奥的戳带,正面的褶层戳带,和低岬消沉。它能向南向北被划分成五个片断从到的分割工具:北片断, Anxian 转移地区,中心片断, Guanxian 转移地区和南部的片断。层化意味着分开层在侧面划分结构的式样。在 Longmen 山戳带的分开层能被分类进三个范畴:深水平的分开层包括外壳披风系统分开层, intracrustal 分开层,和 Presinian 系统基础分开层;中间级的分开层包括寒武纪奥陶纪的分开层,志留纪分开层,等等;并且浅水平的分开层,包括的上面的三叠纪的 Xujiahe 形成分开层和侏罗记分开层。多水平分开层在塑造和 Longmen 山戳带的进化上有很重要的效果。TANG Liangjie YANG Keming JIN Wenzheng WAN Guimei LüZhizhou YU Yixin 2009Acta Geologica Sinica(English Edition)2009,83,1:6
10A calculation method for a power user's CIC under specific conditions in smart distribution grid显示文摘This paper presents a practical method for calculating a power user’s customer interruption costs(CIC)under specific conditions.This novel method has been developed,based on the CIC results predicted by Lawrence Berkeley National Laboratory(LBNL),so that the key factors,such as customer type,customer size,interruption occurrence time and interruption duration can be considered.As compared to the LBNL method,the method proposed here is easy to understand and easy to execute with an acceptable error.It lays a solid foundation for further investigation of distributed generators and demand response in assessing reliability value of smart distribution grid(SDG).The effectiveness of the proposed method is confirmed through the assessment of RBTS-Bus2.SUN Bing YU YiXin 2015Science China(Technological Sciences)2015,58,7:6
11CD26 upregulates proliferation and invasion in keloid fibroblasts through an IGF-1-induced PI3K/AKT/mTOR pathway显示文摘Background:Keloid is a fibrotic dermal disease characterized by an abnormal increase in fibroblast proliferation and invasion.These pathological behaviours may be related to the heterogeneity of keloid fibroblasts(KFs);however,because of a lack of effective biomarkers for KFs it is difficult to study the underlying mechanism.Our previous studies revealed that the expansion of CD26+KFs was responsible for increased keloid proliferation and invasion capabilities;the intrinsic relationship and mechanism between CD26 and keloid is therefore worthy of further investigation.The aim of this studywas to explore molecular mechanisms in the process of CD26 upregulated KFs proliferation and invasion abilities,and provide more evidence for CD26 as an effective biomarker of keloid and a new clinical therapeutic target.Methods:Flow cytometry was performed to isolate CD26+/CD26−fibroblasts from KFs and normal fibroblasts.To generate stably silenced KFs for CD26 and insulin-like growth factor-1 receptor(IGF-1R),lentiviral particles encoding shRNA targeting CD26 and IGF-1R were used for transfection.Cell proliferations were analysed by cell counting kit-8 assay and 5-ethynyl-2-deoxyuridine(EdU)incorporation assay.Scratching assay and transwell assay were used to assess cell migration and invasion abilities.To further quantify the regulatory role of CD26 expression in the relevant signalling pathway,RT-qPCR,western blot,ELISA,PI3K activity assay and immunofluorescence were used.Results:Aberrant expression of CD26 in KFs was proven to be associated with increased proliferation and invasion of KFs.Furthermore,the role of the IGF-1/IGF-1 receptor axis was also studied in CD26 and was found to upregulate KF proliferation and invasion.The PI3K/protein kinase B(AKT)/mammalian target of rapamycin(mTOR)pathway was shown to affect CD26-regulated KF proliferation and invasion by increasing phosphorylation levels of S6 kinase and 4E-binding protein.Conclusions:CD26 can be the effective biomarker for KFs,and its expression is closely related to proliferation and invasion in keloids through the IGF-1-induced PI3K/AKT/mTOR pathway.This work provides a novel perspective on the pathological mechanisms affecting KFs and therapeutic strategies against keloids.Yu Xin Peiru Min Heng Xu Zheng Zhang Yan Zhang Yixin Zhang 2020Burns & Trauma2020,8,1:5
12Advances and prospects of PVDF based polymer electrolytes显示文摘Exploring highly foldable batteries with no safety hazard is a crucial task for the realization of portable,wearable,and implantable electric devices.Given these concerns,developing solid-state batteries is one of the most promising routes to achieve this aspiration.Because of the excellent flexibility and processability,polyvinylidene fluoride(PVDF) based electrolytes possess great potential to pack high energy density flexible batteries,however,suffers the various intrinsic shortcomings such as inferior ionic conductivity,a high degree of crystallinity,and lack of reactive groups.Clearing the progress of the present state and concluding the specific challenges faced by PVDF based electrolytes will help to develop PVDF based polymer batteries.In this review,we summarize the recent progress of gel polymer electrolytes and all solid polymer electrolytes based on PVDF.The ion transport mechanisms and preparation methods of PVDF based electrolytes are briefly introduced.Meanwhile,the current design principle and properties of electrolytes are highlighted and systematically discussed.Some peculiar modified strategies performed in lithium-sulfur batteries and lithium-oxygen batteries are also included.Finally,this review describes the challenges and prospects of some solid-state electrolytes to provide strategies for manufacturing high-performance PVDF electrolytes aimed at practical application with flexible requirements.Yixin Wu Yu Li Yang Wang Qian Liu Qingguo Chen Minghua Chen 2022Journal of Energy Chemistry2022,31,1:5
13Security region based security-constrained unit commitment显示文摘As the issues of security and stability of power systems are becoming increasingly significant,it is necessary to consider the constraints of the static voltage stability and transient stability,which are closely related to the active power dispatch of power systems,in the daily power dispatch,i.e.the unit commitment.However,due to the complexity of these constraints and limitation of the existing analysis methods,there has been no unit commitment model reported so far that can deal with these security constraints.On the other hand,as lack of effective measures to evaluate the security margin of dispatch schemes,it is difficult for power system operators to integrate both the security and economy of power systems in unit commitment.To resolve the above-mentioned issues,a security region based security-constrained unit commitment model is presented in the paper,which gives consideration to both the security and economy of power systems.For the first time,the active power flow constraint,the static voltage stability constraint and the transient stability constraint are taken into account in unit commitment at the same time.The model presented in the paper takes the operating cost,the branch transmission capacity margin,the static voltage stability margin and the transient stability margin as sub-objectives.By adjusting the weighting factors of sub-objectives,it is convenient to adjust the preference on the security and economy of power systems and reach a balance.The IEEE RTS-24 test system is adopted to validate the correctness and the efficiency of the proposed model.YU YiXin QIN Chao 2013Science China(Technological Sciences)2013,56,11:5
14Imaging energetic electron spectrometer onboard a Chinese navigation satellite in the inclined GEO orbit显示文摘The energetic electron measurement is one of the most important issues to understand dynamics in space physics and the applications for space weather. In this study, the principle and functional components of the imaging energetic electron spectrometer(IES) onboard a Chinese navigation satellite in the inclined GEO orbit(IGSO) was introduced. The IES instrument is developed by the team in Peking University(BeiDa), thus it is named as BD-IES. Based on the pin-hole technique, the instrument can measure 50–600 keV electrons incident from 9 directions over a range of 180° in polar angle. With pulse height analysis(PHA), the spectrum can be determined for each direction. The energy and angular calibrations were performed, which show the good energy and angular characteristics of BD-IES. Monte Carlo simulations show that the anti-proton design of BDIES can effectively decrease the proton contamination on the electron measurements in the inclined GEO orbit. The primary results of BD-IES verify the successful design of this instrument.ZOU Hong YE YuGuang ZONG QiuGang CHEN HongFei ZOU JiQing CHEN Jiang SHI WeiHong YU XiangQian ZHONG WeiYing WANG YongFu ZHOU XuZhi HAO YiXin CHEN XingRan JIA XiangHong XU Feng SHAO SiPei WANG Bo HAO XiaoYun ZHANG XiaoXin 2018Science China(Technological Sciences)2018,61,12:5
15Main Structural Styles and Deformation Mechanisms in the Northern Sichuan Basin,Southern China显示文摘摘要:三叠纪的 Jialingjiang 形成和 Leikoupo 形成被厚盐层描绘。三个 tectono-stratigraphic 序列能在北四川盆根据降低中间的三叠纪的盐床的分开层被识别,即亚盐顺序 Sinian 创作了到更低的三叠纪的 Feixianguan 形成,更低的三叠纪的 Jialingjiang 形成的盐顺序和中间三叠纪的 Leikoupou 形成,并且在上盐顺序上面三叠纪的 Xujiahe 形成,侏罗记和白垩纪的大陆人 clastics 创作了。一系列特定的结构的式样例如包含地下室的使成鳞状的戳带的强烈地使变形的带,包含地下室、分开盐的附加的使变形的带,埋葬的盐相关的分开的带,双,堆三角地区和弹出式,在北四川盆发展了。相对薄的盐床,与北四川盆的结构的变丑联系了,可能充当大 decollement 层。在北四川盆的变丑机制包括了地区性的压缩和弄短的、塑料流动和分开,构造 upwelling 和侵蚀,重力的滑动并且传播。在北四川盆的来源岩石是位于盐层下面的阶层,例如寒武纪,志留纪并且二叠。与三叠纪的盐有关的结构的变丑为烃控制了陷井的式样。在北四川盆的烃陷井的形成和发展可能有一在对烃累积和保藏有利的降低中间的三叠纪的盐序列之上适用。盐层在降低中间三叠纪形成了主要帽子摇并且为烃的累积和保藏是有利的。TANG Liangjie GUO Tonglou JIN Wenzheng YU Yixin LI Rufeng 2008Acta Geologica Sinica(English Edition)2008,82,3:5
16Small signal stability region of power systems with DFIG in injection space显示文摘The modal analysis method is utilized to study the influence of doubly-fed induction generator(DFIG)on electromechanical oscillations.On this basis,the small signal stability region(SSSR)of power systems with DFIG in injection space is evaluated and the corresponding relationship between SSSR boundary and electromechanical oscillations is analyzed.The effects of the locations of DFIG on SSSR are considered.It is found that the boundary of SSSR consists of several smooth surfaces,which can be approximated with hyper-planes in engineering application.With the integration of DFIG,SSSR becomes smaller,thus indicating the deterioration of the small signal stability of the system.The 11-bus system with four generators is used to illustrate the proposed method.Chao QIN Yixin YU 2013Journal of Modern Power Systems and Clean Energy2013,1,2:5
17Rapid health transition in China, 1990–2010: findings from the Global Burden of Disease Study 2010显示文摘Gonghuan Yang Yu Wang Yixin Zeng George F Gao Xiaofeng Liang Maigeng Zhou Xia Wan Shicheng Yu Yuhong Jiang Mohsen Naghavi Theo Vos Haidong Wang Alan D Lopez Christopher JL Murray 2013The Lancet . 2013 (9882)2013,,9882:4
18Calculation of Depth to Detachment and Its Significance in the Kuqa Depression显示文摘The depth to detachment level is a critical factor affecting the quality of structural modeling in fold and thrust belts. There are several detachment levels developed in the Kuqa depression. Based on the excess-area diagram, this paper concerns mainly the calculation of the depth to detachment in the Kuqa depression. The result demonstrates that the detachment levels are situated in different strata in varying zones, such as the Paleogene Kugeliemu Formation, the Paleozoic and the crystalline basement. The calculated depth to detachment level is very helpful for testing whether a structural interpretation is reasonable and for defining the depth of deeper detachment levels which were not discerned in seismic profiles.Yu Yixin Tang Liangjie Yin Jinyin Wang Qinghua Yang Wenjing Peng Gengxin 2006Petroleum Science2006,3,2:4
19Protective effect of Chushizi(Fructus Broussonetiae)on acetaminophen-induced rat hepatitis by inhibiting the Toll-like receptor 3/c-Jun N-terminal kinase/c-jun/c-fos/janus protein tyrosine kinase/activators of transcription 3 pathway显示文摘OBJECTIVE:To observe the intervention of Chushizi(Fructus Broussonetiae)(CSZ)on drug-induced liver injury(DILI)in rats,as well as indicators of liver function,serum levels of inflammatory cytokines,and expression of proteins and m RNA associated with toll-like receptor 3(TLR3)and the signal transducer and activator of transcription 3(STAT3)pathway in the liver[TLR3,janus protein tyrosine kinase 2(JAK2),c-jun,c-fos,c-Jun N-terminal kinase 2(JNK2),and STAT3].METHODS:Forty specified pathogen free grade Sprague-Dawley rats were randomly divided into the control group,the model group,the silybin group and the CSZ group.Rats were given acetaminophen(APAP)to trigger DILI.Histopathology of the liver was observed by hematoxylin-eosin staining.The levels of alanine aminotransferase(ALT),aspartate transaminase(AST),direct bilirubin(DBIL),and total bilirubin(TBIL)in serum were detected by a semi-automatic biochemical instrument.Content of tumor necrosis factor alpha(TNF-α),interleukin(IL)-6,IL-13,and IL-22 in serum were detected by the enzyme-linked immunosorbent assay,the expression of TLR3,phosphorylation of JAK2(p-JAK2),while c-jun and c-fos proteins in the liver were determined by immunohistochemistry;expression of JNK2,and STAT3 in the liver were assayed by Western blot and real-time quantitative polymerase chain reaction.P-JNK2 and p-STAT3 in the liver were assayed by Western blot.RESULTS:After treatment,the activity of ALT,AST,and concentrations of TBIL,DBIL,TNF-α,IL-6,as well as IL-13 in serum,were lower than those in the model group,and expression of p-JAK2,TLR3,c-jun,c-fos,p-STAT3,and p-JNK2 could be downregulated.CONCLUSION:Our findings suggest that CSZ is a valid medicine to alleviate APAP-induced DILI,while its partial mechanism may regulate the TLR3/JNK/c-jun/c-fos/JAK/STAT3 pathway.Zhang Yandong Biao Yaning Chu Xinqiao Hao Lei Shi Cheng Liu Yu Zhang Yixin Wang Xi 2020Journal of Traditional Chinese Medicine2020,40,6:4
20Influence of acupuncture with exercise training on learning and memory functions, as well as microtubule-associated protein-2 and synaptophysin expression in the hippocampal CA3 region, in a rat model of cerebral infarction显示文摘The present study was designed to determine microtubule-associated protein-2 and synaptophysin expression in the hippocampal CA3 region in a rat model of middle cerebral artery occlusion. The rats were treated with acupuncture at Baihui (GV 20), Qubin (GB 7), and Qianding (GV 21) points, in addition to exercise training. Results were compared with rats undergoing exercise training only. The Y-maze method and immunohistochemistry revealed decreased error frequency of passing through Y-maze, as well as significantly increased microtubule-associated protein-2 and synaptophysin expression, in the acupuncture with exercise training group compared with the model and exercise training groups after 5 weeks. Microtubule-associated protein-2 and synaptophysin expressions negatively correlated with error frequency of passing through the Y-maze. These results suggested that acupuncture combined with exercise training improved learning and memory functions in a rat model of cerebral infarction. The mechanisms of action were hypothesized to be associated with dendritic or synaptic plasticity in the ipsilateral hippocampal CA3 region.Wei Jiang Liubing Li Min Yang Yanzhen Bi Kehui Hu Peng Zhang Yixin Shen Qian Yu 2011Neural Regeneration Research2011,6,27:4
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