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1338篇 您的检索式:作者名="Zhiyuan"
    题名 作者 年代 出处 被引量
1The machinery of macroautophagy显示文摘Autophagy 是一首先发生在所有真核细胞的房间的 degradative 小径。它被用于再循环细胞质在压力条件下面产生 macromolecular 积木和精力,到移开过剩、损坏的细胞器适应改变滋养的条件并且维持细胞的动态平衡。另外, autophagy 由在抗原表示包括侵略微生物和它的参予的消除在免疫的各种各样的方面阻止有毒的蛋白质并且通过它的行动的累积在 cytoprotection 起一个关键作用。autophagy 的最流行的形式是 macroautophagy,并且在这期间处理房间形式扣押的双膜分隔空间称为 phagophore,它成熟进 autophagosome。后面的交货到液泡或 lysosome,货物被降级,产生大分子为复用回来被释放进 cytosol。过去的二十年关于在酵母和另外的优核质被执行的 autophagy 的分子的研究导致了巨大的增加。在对这个话题的兴趣的巨浪的部分由于有包括癌症, myopathies,糖尿病和 neurodegenerative 疾病的大量人的 pathophysiologies 的 autophagy 的连接。然而,仍然有 autophagy 的许多方面仍然保持不清楚包括 phagophore 形成的进程,控制它的正式就职和大多数 autophagy 相关的蛋白质的函数的规章的机制。在这评论,我们集中于 macroautophagy,简短在哺乳动物的房间描述这个过程的发现,有关形成 phagophore 的施主膜讨论当前的看法,并且包括可得到的结构的信息描绘 autophagy 机械。Yuchen Feng Ding He Zhiyuan Yao Daniel J Klionsky 2014Cell Research2014,24,1:150
2H7N9 virulent mutants detected in chickens in China pose an increased threat to humans显示文摘Jianzhong Shi Guohua Deng Huihui Kong Chunyang Gu Shujie Ma Xin Yin Xianying Zeng Pengfei Cui Yan Chen Huanliang Yang Xiaopeng Wan Xiurong Wang Liling Liu Pucheng Chen Yongping Jiang Jinxiong Liu Yuntao Guan Yasuo Suzuki Mei Li Zhiyuan Qu Lizheng Guan Jinkai Zang Wenli Gu Shuyu Han Yangming Song Yuzhen Hu Zeng Wang Linlin Gu Wenyu Yang Libin Liang Hongmei Bao Guobin Tian Yanbing Li Chuanling Qiao Li Jiang Chengjun Li Zhigao Bu Hualan Chen 2017Cell Research2017,27,12:70
3A seven-gene-deleted African swine fever virus is safe and effective as a live attenuated vaccine in pigs显示文摘African swine fever(ASF)is a devastating infectious disease in swine that is severely threatening the global pig industry.An efficacious vaccine is urgently required.Here,we used the Chinese ASFV HLJ/18 as a backbone and generated a series of genedeleted viruses.The virulence,immunogenicity,safety,and protective efficacy evaluation in specific-pathogen-free pigs,commercial pigs,and pregnant sows indicated that one virus,namely HLJ/18-7GD,which has seven genes deleted,is fully attenuated in pigs,cannot convert to the virulent strain,and provides complete protection of pigs against lethal ASFV challenge.Our study shows that HLJ/-18-7GD is a safe and effective vaccine against ASFV,and as such is expected to play an important role in controlling the spread of ASFV.Weiye Chen Dongming Zhao Xijun He Renqiang Liu Zilong Wang Xianfeng Zhang Fang Li Dan Shan Hefeng Chen Jiwen Zhang Lulu Wang Zhiyuan Wen Xijun Wang Yuntao Guan Jinxiong Liu Zhigao Bu 2020Science China(Life Sciences)2020,63,5:72
4R&D and application of voltage sourced converter based high voltage direct current engineering technology in China显示文摘As a new generation of direct current(DC)transmission technology,voltage sourced converter(VSC)based high voltage direct current(HVDC)has been widely developed and applied all over the world.China has also carried out a deep technical research and engineering application in this area,and at present,it has been stepped into a fast growing period.This paper gives a general review over China’s VSC based HVDC in terms of engineering technology,application and future development.It comprehensively analyzes the technical difficulties and future development orientation on the aspects of the main configurations of VSC based HVDC system,topological structures of converters,control and protection technologies,flexible DC cables,converter valve tests,etc.It introduces the applicable fields and current status of China’s VSC based HVDC projects,and analyzes the application trends of VSC based HVDC projects both in China and all over the world according to the development characteristics and demands of future power grids.Guangfu TANG Zhiyuan HE Hui PANG 2014Journal of Modern Power Systems and Clean Energy2014,2,1:55
5Linking atmospheric pollution to cryospheric change in the Third Pole region: current progress and future prospects显示文摘The Tibetan Plateau and its surroundings are known as the Third Pole(TP). This region is noted for its high rates of glacier melt and the associated hydrological shifts that affect water supplies in Asia. Atmospheric pollutants contribute to climatic and cryospheric changes through their effects on solar radiation and the albedos of snow and ice surfaces; moreover, the behavior and fates within the cryosphere and environmental impacts of environmental pollutants are topics of increasing concern. In this review, we introduce a coordinated monitoring and research framework and network to link atmospheric pollution and cryospheric changes(APCC) within the TP region. We then provide an up-to-date summary of progress and achievements related to the APCC research framework, including aspects of atmospheric pollution’s composition and concentration, spatial and temporal variations, trans-boundary transport pathways and mechanisms, and effects on the warming of atmosphere and changing in Indian monsoon, as well as melting of glacier and snow cover. We highlight that exogenous air pollutants can enter into the TP’s environments and cause great impacts on regional climatic and environmental changes. At last, we propose future research priorities and map out an extended program at the global scale. The ongoing monitoring activities and research facilitate comprehensive studies of atmosphere–cryosphere interactions, represent one of China’s key research expeditions to the TP and the polar regions and contribute to the global perspective of earth system science.Shichang Kang Qianggong Zhang Yun Qian Zhenming Ji Chaoliu Li Zhiyuan Cong Yulan Zhang Junming Guo Wentao Du Jie Huang Qinglong You Arnico K.Panday Maheswar Rupakheti Deliang Chen Orjan Gustafsson Mark H.Thiemens Dahe Qin 2019National Science Review2019,6,4:35
6FOXP3 + regulatory T cells and their functional regulation显示文摘FOXP3 + 规章的 T (Treg ) 房间在维持免疫系统的有免疫力的忍耐和动态平衡是批评的。位于稳定性,粘性和 Treg 房间的功能的活动下面的分子的机制很在最近的年里被学习了。这里,我们总结这些吸引人的调查结果,并且为自体免疫的疾病, graft-versus-host 疾病(GVHD ) 和癌症的治疗在 Treg 房间治疗期间提供卓见进他们的潜在的使用或操作。Zhiyuan Li Dan Li Andy Tsun Bin Li 2015Cellular & Molecular Immunology2015,12,5:34
7Basic Topology and Key Devices of the Five-Terminal DC Grid显示文摘Due to their high controllability and flexibility,DC power grids have broad application prospects in the fields of networking of renewable energy and the power supply for oceanic archipelagos and future cities.This paper describes the system topology,control strategy,DC breaker configuration,and research,development and testing of converter valves and DC breaker equipment of the Zhoushan multi-terminal DC transmission system.Zhejiang Zhoushan has unique geographical and developmental features to demonstrate the irreplaceable technical advantages of a DC power grid for providing reliable power supply.The experience gained from the Zhoushan DC power grid project can offer valuable insights into the development and utilization of this technology worldwide.Guangfu Tang Zhiyuan He Hui Pang Xiaoming Huang Xiao-Ping Zhang 2015CSEE Journal of Power and Energy Systems2015,1,2:30
8Additive manufacturing of metals:Microstructure evolution and multistage control显示文摘As a revolutionary industrial technology,additive manufacturing creates objects by adding materials layer by layer and hence can fabricate customized components with an unprecedented degree of freedom.For metallic materials,unique hierarchical microstructures are constructed during additive manufacturing,which endow them with numerous excellent properties.To take full advantage of additive manufacturing,an in-depth understanding of the microstructure evolution mechanism is required.To this end,this review explores the fundamental procedures of additive manufacturing,that is,the formation and binding of melt pools.A comprehensive processing map is proposed that integrates melt pool energy-and geometry-related process parameters together.Based on it,additively manufactured microstructures are developed during and after the solidification of constituent melt pool.The solidification structures are composed of primary columnar grains and fine secondary phases that form along the grain boundaries.The post-solidification structures include submicron scale dislocation cells stemming from internal residual stress and nanoscale precipitates induced by intrinsic heat treatment during cyclic heating of adjacent melt pool.Based on solidification and dislocation theories,the formation mechanisms of the multistage microstructures are thoroughly analyzed,and accordingly,multistage control methods are proposed.In addition,the underlying atomic scale structural features are briefly discussed.Furthermore,microstructure design for additive manufacturing through adjustment of process parameters and alloy composition is addressed to fulfill the great potential of the technique.This review not only builds a solid microstructural framework for metallic materials produced by additive manufacturing but also provides a promising guideline to adjust their mechanical properties.Zhiyuan Liu Dandan Zhao Pei Wang Ming Yan Can Yang Zhangwei Chen Jian Lu Zhaoping Lu 2022Journal of Materials Science & Technology2022,,5:27
9Performance of a quantum heat engine cycle working with harmonic oscillator systems显示文摘A cycle model of an irreversible heat engine working with harmonic systems is established in this paper. Based on the equation of motion of an operator in the Heisenberg picture and semi-group approach, the first law of thermodynamics for a harmonic system and the time evolution of the system are obtained. The general expressions for several important parameters, such as the work, efficiency, power output, and rate of entropy production are derived. By means of numerical analysis, the optimally operating regions and the optimal values of performance parameters of the cycle are determined under the condition of maximum power output. At last, some special cases, such as high temperature limit and frictionless case, are dis-cussed in brief.WANG JianHui HE JiZhou MAO ZhiYuan 2007Science China(Physics,Mechanics & Astronomy)2007,50,2:25
10Mining the interests of Chinese microbloggers via keyword extraction显示文摘Microblogging 为在网用户之中传达并且分享信息提供一个新平台。用户们能用 microblogs 表示意见和记录日报生活。被用户张贴的 Microblogs 显示他们的兴趣到某程度。我们从 microblogs 经由关键词抽取瞄准到矿用户兴趣。传统的关键词抽取方法通常为象新闻文章或科学报纸那样的正式文件被设计。然而, microblogging 用户张贴的消息通常新词吵闹、完整,它是为关键词抽取的挑战。在这份报纸,我们为关键词抽取把一个基于翻译的方法与一个基于频率的方法相结合。在我们的实验,我们在中国从最大的 microblogging 网站为 microblog 用户提取关键词, Sina Weibo。结果证明我们的方法能精确地并且高效地识别用户兴趣。Zhiyuan LIU Xinxiong CHEN Maosong SUN 2012Frontiers of Computer Science2012,6,1:26
11The value of vegetation ecosystem services:a case of Qinling-Daba Mountains显示文摘According to differences in vegetation types and their coverage, combining the latest research, using theory and method on the value of vegetation ecosystem services, this paper not only calculated goods produced by different types of vegetation but also estimated the value of various vegetation ecosystem services and set up database, GIS and eco-account of vegetation ecosystem. The result was as follows: the value of vegetation’s primary productivity, soil and fertility conservation, water conservation, CO 2 fixation and O 2 release was 199.6 billion yuan/a, 22.64 billion yuan/a, 22.66 billion yuan/a, 352.24 billion yuan/a and 374.19 billion yuan/a, respectively. The total value of ecosystem services was 968.33 billion yuan/a. The temperate deciduous broad-leaved forest had the highest contribution rate, accounting for 16.42%. The result of value can reflect regional reality more exactly.REN Zhiyuan,ZHANG Yanfang,LI Jing(College of Tourism and Environment, Shaanxi Normal University, Xi’an 710062, China) 2003Journal of Geographical Sciences2003,13,2:20
12shRNA targeting HDGF suppressed cell growth and invasion of squamous cell lung cancer显示文摘导出 Hepatoma 的生长因素(HDGF ) ,有 mitogenic 的原子蛋白质和 angiogenic 活动,被报导了主要涉及 tumorigenesis 和非小的房间肺癌症的前进。在这研究, HDGF 表示被 specific-shRNA 与在肺指向 HDGF 的 lentivirus 表示向量击倒有鳞的房间癌 520 房间。shRNA 击倒的 HDGF 在 vitro 并且在由 MTT,板克隆和移植肿瘤模型试金显示了的 vivo 显著地压制了房间增长。另外, HDGF 的组合式的表达式也禁止了出现在 transwell 和 Boyden 实验的房间移植和侵略。因为参予有鳞的房间肺癌症的致病的 oncogene,和 HDGF 可以是为非小的房间肺癌症的一个关键治疗学的目标,我们断定 HDGF 行动。Jie Meng Wei Xie Liming Cao Chengping Hu Zhiyuan Zhen 2010Acta Biochimica et Biophysica Sinica2010,42,1:19
13A Hybrid Forecasting Framework Based on Support Vector Regression with a Modified Genetic Algorithm and a Random Forest for Traffic Flow Prediction显示文摘The ability to perform short-term traffic flow forecasting is a crucial component of intelligent transportation systems. However, accurate and reliable traffic flow forecasting is still a significant issue due to the complexity and variability of real traffic systems. To improve the accuracy of short-term traffic flow forecasting, this paper presents a novel hybrid prediction framework based on Support Vector Regression(SVR) that uses a Random Forest(RF) to select the most informative feature subset and an enhanced Genetic Algorithm(GA) with chaotic characteristics to identify the optimal forecasting model parameters. The framework is evaluated with real-world traffic data collected from eight sensors located near the I-605 interstate highway in California. Results show that the proposed RFCGASVR model achieves better performance than other methods.Lizong Zhang Nawaf R Alharbe Guangchun Luo Zhiyuan Yao Ying Li 2018Tsinghua Science and Technology2018,23,4:19
14Energy-Optimal and Delay-Bounded Computation Offloading in Mobile Edge Computing with Heterogeneous Clouds显示文摘By Mobile Edge Computing(MEC), computation-intensive tasks are offloaded from mobile devices to cloud servers, and thus the energy consumption of mobile devices can be notably reduced. In this paper, we study task offloading in multi-user MEC systems with heterogeneous clouds, including edge clouds and remote clouds. Tasks are forwarded from mobile devices to edge clouds via wireless channels, and they can be further forwarded to remote clouds via the Internet. Our objective is to minimize the total energy consumption of multiple mobile devices, subject to bounded-delay requirements of tasks. Based on dynamic programming, we propose an algorithm that minimizes the energy consumption, by jointly allocating bandwidth and computational resources to mobile devices. The algorithm is of pseudo-polynomial complexity. To further reduce the complexity, we propose an approximation algorithm with energy discretization, and its total energy consumption is proved to be within a bounded gap from the optimum. Simulation results show that, nearly 82.7% energy of mobile devices can be saved by task offloading compared with mobile device execution.Tianchu Zhao Sheng Zhou Linqi Song Zhiyuan Jiang Xueying Guo Zhisheng Niu 2020China Communications2020,17,5:18
15A DC Grid Benchmark Model for Studies of Interconnection of Power Systems显示文摘Reducing carbon emissions in the power sector is critical for transitioning to a sustainable and low-carbon future.Estimating carbon efficiency of demand side response(DSR)in the power system is an important step towards realizing potential environmental benefits.Marginal emission factor(MEF)is an effective tool for estimating incremental changes in carbon emissions as a result of a change in demand.However,estimation methods currently used for evaluating MEF can be improved upon,specifically,by factoring in the ramp-rate constraint of generators in the fuel cost based merit order dispatch.In this paper is described a new method for MEF assessment under ramp-rate constraints;the method is then compared with two conventional estimations in a British power system.Three fuel price scenarios are used to conduct a sensitivity analysis of MEFs to fuel prices.Conclusions are drawn that can pave the way for future improvements in estimating MEF in power systems.Ting An Xiaoxin Zhou Congda Han Yanan Wu Zhiyuan He Hui Pang Guangfu Tang 2015CSEE Journal of Power and Energy Systems2015,1,4:17
16Annular multiphase flow behavior during deep water drilling and the effect of hydrate phase transition显示文摘It is very important to understand the annular multiphase flow behavior and the effect of hydrate phase transition during deep water drilling.The basic hydrodynamic models,including mass,momentum,and energy conservation equations,were established for annular flow with gas hydrate phase transition during gas kick.The behavior of annular multiphase flow with hydrate phase transition was investigated by analyzing the hydrate-forming region,the gas fraction in the fluid flowing in the annulus,pit gain,bottom hole pressure,and shut-in casing pressure.The simulation shows that it is possible to move the hydrate-forming region away from sefloor by increasing the circulation rate.The decrease in gas volume fraction in the annulus due to hydrate formation reduces pit gain,which can delay the detection of well kick and increase the risk of hydrate plugging in lines.Caution is needed when a well is monitored for gas kick at a relatively low gas production rate,because the possibility of hydrate presence is much greater than that at a relatively high production rate.The shut-in casing pressure cannot reflect the gas kick due to hydrate formation,which increases with time.Wang Zhiyuan Sun Baojiang 2009Petroleum Science2009,6,1:17
17Discovery and preliminary study of the high tungsten and lithium contents in the Dazhuyuan bauxite deposit, Guizhou, China显示文摘Bauxite in China remains an urgently needed resource largely dependent on imports. Based on the study of the newly-discovered Dazhuyuan bauxite deposit in northeastern Guizhou, we have found new enrichment of tungsten and lithium in bauxite, with the highest WO 3 content up to 0.33% and the highest Li 2 O content up to 0.58%. The present paper reports the initial result, and the spatial distribution feature of W and Li in the ore body (with Li enriched mostly in the north part of the west limb of the Liyuan syncline, whereas W enriched mostly in the central part of the east limb). The results suggest that it is necessary to delineate lithium and tungsten ore body independently, discuss the feasibility of its industrial utilization, and point out the new direction of synthetic appraisal for such kinds of traditional mineral resources, in order to forecast and assess bauxite resources in the region.WANG DengHong LI PeiGang QU WenJun YIN LiJuan ZHAO Zhi LEI ZhiYuan WEN ShenFu 2013Science China Earth Sciences2013,56,1:16
18High salt primes a specific activation state of macrophages, M(Na)显示文摘Wu-Chang Zhang Xiao-Jun Zheng Lin-Juan Du Jian-Yong Sun Zhu-Xia Shen Chaoji Shi Shuyang Sun Zhiyuan Zhang Xiao-qing Chen Mu Qin Xu Liu Jun Tao Lijun Jia Heng-yu Fan Bin Zhou Ying Yu Hao Ying Lijian Hui Xiaolong Liu Xianghua Yi Xiaojing Liu Lanjing Zhang Sheng-Zhong Duan 2015Cell Research2015,25,8:15
19Study on the photosynthetic performances of Enteromorpha prolifera collected from the surface and bottom of the sea of Qingdao sea area显示文摘In this work, the photosynthetic performances of Enteromorpha prolifera thalli collected from the sur- face and bottom of the sea of Qingdao sea area were studied with chlorophyll fluorescence and oxy- graph technology. The samples with the highest photosynthetic activity among their kinds, the floating thalli from the sea surface of the south of the Qingdao Olympic Sailing Center and the sedimentary thalli from the mud surface of the bottom Tuandao bay, were chosen as representatives of surface thalli and bottom thalli, respectively. The results showed that the maximal PSII quantum yield of the floating thalli was significantly lower than the normal level although their photosynthetic activities were relatively high; the photosynthetic potential of the thalli form the mud surface was extremely low. Thus, it is indicated that the floating thalli are seriously stressed by their environment and the thalli from the mud surface are already dead or are dying. On the other hand, the results of the laboratory cultivation showed that the sedimentary thalli cannot regain normal photosynthetic activity even under normal illumination condi- tions. Thus, the thalli from the mud surface cannot become reproductive source of the alga even if they can reach sea surface again. Therefore, a preliminary conclusion can be reached that, up to mid-July 2008, the environmental conditions of the Qingdao sea area are not suitable for the growth of the alga E. prolifera and for this reason the biomass of E. prolifera, in the area, could be declining.LIN APeng WANG Chao QIAO HongJin PAN GuangHua WANG GuangCe SONG LiYun WANG ZhiYuan SUN Song ZHOU BaiCheng 2009Chinese Science Bulletin2009,54,3:14
20Diversity and high nitrogenase activity of endophytic diazotrophs isolated from Oryza rufipogon Griff.显示文摘Diversity and nitrogenase activity of endophytic diazotrophs colonized in the wild rice Oryza rufipogon Griff grown in Boluo, Huilai County in Guangdong Province and Lingshui County in Hainan Province were studied. Thirty-seven isolates obtained from Oryza rufipogon were identified as putative endophytic nitrogen-fixing bacteria by ARA (acetylene reduction assay) test and further confirmed by PCR amplification of nifH gene fragments. All obtained strains have ARA activity and the same sized nifH gene fragments. Above the similarity level of 80%, the obtained isolates were assigned as Group Ⅰ to Ⅷ by the clustering of IS-PCR fingerprints. The SDS-PAGE whole-cell protein patterns were similar to those of IS-PCR fingerprints. Components and contents of fatty acid methyl esters (FAMEs) were used to differentiate the representative strains (Ls13, Ls8, BL1, BL12, HL6, Ls4) from Group Ⅰ to Group Ⅵ. The six representative strains showed significant difference in contents and components of cellular fatty acid methyl ester. 16S rDNA sequencing analysis showed that strains of Group Ⅰ to Ⅶ were located in Enterobacteraceae (γ-proteobacteria). Strains of Group Ⅰ and Group II were closely related to Klebsiella sp.; Strain Ls8 of Group Ⅱ was a little far away from the genus of Pantoea (homology level 96% with Pantoea agglomerans), which may represent a new species or genus in Enterobacteraceae; Strains of Groups IV and V belonged to different Enterobacter sp.; Strain Ls4 and Ls 9 representing Group Ⅵ were close to Citrobacter amalonaticus with 98% sequence similarity; Strain Ls15 of Group Ⅶ showed 98% sequence identity with Pantoea sp.; Strains of Group Ⅷ were assigned to the genus Ideonella (β-proteobacteria). Based on the above results, endophytic diazotrophs isolated from O. rufipogon showed great diversity and some diazotrophs showed high nitrogenase activity with 42.52 μmol/mL·h C2H4. Inoculation to rice tests indicated that the isolated endophytic diazotrophs significantly promoted the rice growth.TAN ZhiYuan PENG GuiXiang XU PeiZhi AI ShaoYing TANG ShuanHu ZHANG GuoXia ZENG FengYun 2009Chinese Science Bulletin2009,54,16:14
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