检索结果-南通市图书馆

Autonomous-synergic Voltage Security Regions in Bulk Power Systems

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

Journal of Modern Power Systems and Clean Energy 2023年第2期11卷 686-692页

作者： Fan Li Tao Niu Lin Xue Yuxiao Li Tianen Huang zhenjie wu Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqing 400044China Zhejiang University Hangzhou 310058China Grid Hangzhou Power Supply Company Hangzhou 310020China

Determining security/stability boundaries is a common and critical means of preventing cascading failures induced by voltage-related issues,which represents one of the major challenges in bulk power ***,traditional approaches suffer from conservative issues and heavy computational *** address these challenges,the concept of an autonomous-synergic voltage security region(AS-VSR)and the corresponding dynamic constraint coefficient pruning(DCCP)computation method,which fully consider the volt/var characteristics of bulk power systems,are proposed in this *** linearized and nonlinearized robust optimization problems are introduced to obtain accurate *** computational accuracy,time cost,and advantages of autonomous-synergic control are observed in the simulation results.

关键词： Voltage security region cascading failure dynamic constraint coefficient pruning(DCCP) bulk power system robust optimization

A New Species of the Extinct Genus Schizolepis from the Jurassic Daohugou Flora,Inner Mongolia,China with Special Reference to the Fossil Diversity and Evolutionary Implications

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2011年第2期85卷 471-481页

作者： ZHANG Jianwei Ashalata D＇ROZARIO YAO Jianxin wu zhenjie WANG Lijun Institute of Geology Chinese Academy of Geological Science Beijing 100037 China Department of Botany Narasinha Dutt College 129 Bellilious Road Howrah 711 101 India College of Ethnology and Sociology South Central University for Nationalities Wuhan 430074 Hubei China

Schizolepis daohugouensis sp. nov. is described from the Jurassic sediments of Daohugou flora, from Ningcheng County, Inner Mongolia Autonomous Region, China. The female cone is slender, cylindrical in shape, seed scale complexes are loosely and helically arranged on the cone axis at intervals of 3-5 mm. The seed scales are bilobed and divided almost from the base; the scales have no evident petiole but an articulation at the region of attachment to the cone axis. Each lobe of the seed scales is oval in shape, widest at the lower middle part; lobes are obtusely pointed with entire margins. Bract scale is fan shaped. Based on the records of Schizolepis, this is the first report of the occurrence of female cone of Schizolepis with the seed scales, the winged seeds and vegetative branches preserved together in the Jurassic deposits. The new discovery provides evidence that confirms the phylogenetic position of Schizolepis to the extant Pinaceae.

关键词： Daohugou Jurassic Pinaceae Schizolepis China

Experimental study of hysteresis and catastrophe in a cavity-based scramjet combustor

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2022年第10期35卷 118-133页

作者： Xu ZHANG Qifan ZHANG zhenjie wu Lianjie YUE Zhanbiao GAO Weihang LUO Hao CHEN State Key Laboratory of High Temperature Gas Dynamics Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China Innovation Academy for Light-duty Gas Turbine Chinese Academy of SciencesBeijing 100190China

Hystereses and catastrophes were experimentally investigated in a cavity-based scramjet *** inflow Mach number was *** Equivalence Ratio(ER)was continuously regulated with multi-steps to explore influences of historical regulation directions on combustion *** divided hysteresis loops with catastrophes were *** 1-D flow estimations,the first loop occurred with shock-free/separated scramjet mode transitions,while the second kept in the separated scramjet *** breaks through the traditional knowledge that hysteresis and catastrophe were certainly related to ramjet/scramjet mode *** first hysteresis and catastrophes were attributed to flame stabilization mode transitions between the cavity shearlayer stabilized and the jet-wake stabilized,with flow separation establishment/vanishment upstream the *** obvious variations of flame and shock/separation structures meant large wall-pressure changes in the expansive duct,and generated obvious thrust ***,transition ER and catastrophe were larger in historical ER-increasing path because combustion efficiency became obviously larger as flow separation *** of critical transition ERs meant the first *** second hysteresis and catastrophes in the jet-wake stabilized mode were attributed to flame/shock interaction mode transitions between the flame/shock weak interaction mode and intensive interaction *** transition caused slightly stronger/weaker flame interacting with slightly larger/smaller flow separation,which meant small wall-pressure changes in the expansive duct,and thus thrust catastrophe was *** occurred as the critical transition ER was slightly higher in historical ER-increasing path because of slightly lower combustion efficiency under slightly smaller separation.

关键词： Catastrophe Cavity-based scramjet Flame stabilization Flame/shock interaction Hysteresis

Conodont Biostratigraphy and Age Determination of the Lower-Middle Triassic Boundary in South Guizhou Province,China

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2011年第2期85卷 408-420页

作者： YAO Jianxin JI Zhansheng WANG Liting WANG Yanbin wu zhenjie LIU Dunyi wu Guichun ZHANG Jianwei LI Suping Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China Guizhou Bureau of Geology and Mineral Resources Guiyang 550004 China

The demarcation of the Lower-Middle Triassic boundary is a disputed problem in global stratigraphic research. Lower-Middle Triassic strata of different types, from platform to basin facies,are well developed in Southwest China. This is favorable for the study of the Olenekian-Anisian boundary and establishing a stratotype for the Qingyan Stage. Based on research at the Ganheqiao section in Wangmo county and the Qingyan section in Guiyang city, Guizhou province, six conodont zones have been recognized, which can be correlated with those in other regions, in ascending order as follows： 1, Neospathodus cristagalli Interval-Zone; 2, Neospathodus pakistanensis Interval-Zone; 3,Neospathodus waageni Interval-Zone; 4, Neospathodus homeri-N, triangularis Assemblage-Zone; 5,Chiosella timorensis Interval-Zone; and 6, Neogongdolella regalis Range-Zone. An evolutionary series of the Early-Middle Triassic conodont genera Neospathodus-Chiosella-Neogongdolella discovered in the Ganheqiao and Qingyan sections has an intermediate type named Neospathodus qingyanensis that appears between Neospathodus homeri and Chiosella timorensis in the upper part of the Neospathodus homeri-N, triangularis Zone, showing an excellent evolutionary relationship of conodonts near the Lower-Middle Triassic boundary. The Lower-Middle Triassic boundary is located at 1.5 m below the top of the Ziyun Formation, where Chiosella timorensis Zone first appears in the Qingyan section,whereas this boundary is located 0.5 m below the top of the Ziyun Formation, where Chiosella timorensis Zone first appears in the Ganheqiao section. There exists one nearly 6-m thick vitric tuff bed at the bottom of the Xinyuan Formation in the Ganheqiao section, which is usually regarded as a lithologic symbol of the Lower-Middle Triassic boundary in South China. Based on the analysis of high -precision and high-sensitivity Secondary Ion Mass Spectrum data ,the zircon age of this tuff has a weighted mean 206Pb/238U age of 239.0±2.9

关键词： L-M Triassic Qingyan Stage conodont biostratigraphy isotope chronology South China

Distribution of the Permian Monodiexodina in Karakorum and Kunlun and its Geological Significance

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2009年第2期83卷 229-237页

作者： YAO Jianxin WANG Naiwen XIAO Xuchang JI Zhansheng wu Guichun wu zhenjie LI Boqin WANG Jun WANG Yong ZHAI Qingguo Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China Chang＇an University Xi＇an Shaanxi 712000 China

The Permian fusulinoidean genus Monodiexodina is widely distributed in east Tethys. The genus might be an important indicator for the northern margin of Gondwana in northwestern China, but this is disputed. Monodiexodina-bearing areas can be restored as in either northern or southern middle latitudes with a symmetrical distribution between a high latitudinal, cool/cold water climatic realm and a paleotropical, warm water realm. Permian strata bearing Monodiexodina in Karakorum, Muztag Pear, and Buka Daban Pear of the east Kunlun Mountains can be correlated with each other. Faunal analyses and the stratigraphical position of Monodiexodina-bearing strata indicate that both Karakorum, east Kunlun, and the Pamirs were formed in a cool temperate sea area of the northern hemisphere in middle latitudes during the Permian, rather than at the Gondwana margin.

关键词： Monodiexodina middle latitude symmetric distribution cool temperate sea area,Karakorum east Kunlun northern hemisphere

DSC analyses of static and dynamic precipitation of an Al–Mg–Si–Cu aluminum alloy

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2015年第2期25卷 153-158页

作者： Manping Liu zhenjie wu Rui Yang Jiangtao Wei Yingda Yu P?l C. Skaret Hans J. Roven School of Materials Science and Engineering Jiangsu Province Key Laboratory of Materials Tribology Jiangsu University Department of Materials Science and Engineering Norwegian University of Science and Technology (NTNU)

In the present investigation, both static and dynamic precipitations of an Al–Mg–Si–Cu aluminum alloy after solid-solution treatment(SST)were comparatively analyzed using differential scanning calorimetry(DSC). Dynamic aging was performed in the SST alloy through equal channel angular pressing(ECAP) at different temperatures of room temperature, 110, 170, 191 and 300 1C. For comparison, static artificial aging was conducted in the SST alloy at 191 1C with two aging times of 4 and 10 h. The DSC analyses reveal that the dynamic precipitation has occurred in the ECAPed samples, while the activation energies associated with the strengthening precipitates in the dynamic samples are considerably higher than the energies in the SST and static aged samples. The higher activation energies are probably attributed to the smaller grains and higher dislocation density developed after ECAP. The results in the present investigation allow the prediction of the type of the dynamic precipitates to influence the strength of the ultrafine grained alloy during ECAP at various temperatures.

关键词： Differential scanning calorimetry Al–Mg–Si–Cu aluminum alloy Dynamic aging Precipitation behaviors Equal channel angular pressing Severe plastic deformation

Status of Stratigraphy Research in China

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2016年第4期90卷 1069-1081页

作者： YAO Jianxin BO Jingfang HOU Hongfei WANG Zejiu MA Xiulan LIU Fengshan HU Guangxiao JI Zhansheng wu Guichun wu zhenjie LI Suping GUO Caiqing LI Ya Key Laboratory of Stratigraphy and Paleontology Ministry of Land and Resources Institute of GeologyChinese Academy of Geological Sciences Beijing 100037 China Chinese Academy of Geological Sciences Beijing 100037 China China Geological Survey Beijing 100037 China

Scientific research and productive practice for earth history are inseparable from the accurate stratigraphic framework and time framework. Establishing the globally unified, precise and reliable chronostratigraphic series and geological time series is the major goal of the International Commission on Stratigraphy （ICS）. Under the leadership of the ICS, the countries around the world have carried out research on the Global Standard Stratotype-section and Points （GSSPs） for the boundaries of chronostratigraphic systems. In the current International Chronostratigraphic Chart （ICC）, 65 GSSPs have been erected in the Phanerozoic Eonothem, and one has yet been erected in the Precambrian Eonothem. Based on the progress of research on stratigraphy especially that from its subcommissions, the ICS is constantly revising the ICC, and will publish a new International Stratigraphic Guide in 2020. After continual efforts and broad international cooperation of Chinese stratigraphers, 10 GSSPs within the Phanerozoic Eonothem have been approved and ratified to erect in China by the ICS and IUGS. To establish the standards for strafigraphic division and correlation of China, with the support from the Ministry of Science and Technology, the National Natural Science Foundation of China and the China Geological Survey, Chinese stratigraphers have carried out research on the establishment of Stages in China. A total of 102 stages have been defined in the ＂Regional Chronostratigraphic Chart of China （geologic time）＂, in which 59 stages were studied in depth. In 2014, the ＂Stratigraphic Chart of China＂ was compiled, with the essential contents as follows： the correlation between international chronostratigraphy and regional chronostratigraphy of China （geologic time）, the distributive status of lithostratigraphy, the characteristics of geological ages, the biostratigraphic sequence, the magnetostratigraphy, the geological events and eustatic sea-level change during every geological stage.

关键词： Stratigraphy research process status China.

Research on Software Design of Image Copyright Protection in the Field of Education

在线全文

学校读者我要写书评

暂无评论

International Journal of Communications, Network and System Sciences 2022年第4期15卷 43-52页

作者： Yu Huang Zhengyue Han zhenjie wu Hanyue Zhang Rong wu Jinan University Guangzhou China

Nowadays, image copyright protection is one of the key points of information security in the field of education. Based on the transient property of human vision, the anti-theft and copyright protection strategies are proposed based on the idea of animation synthesis. In this paper, experiments are designed and compared from multiple perspectives. The results show that the strategy based on animation synthesis can not only ensure the browsing effect of images, but also effectively achieve the purpose of preventing interception via screenshot and protecting the legitimate rights of the original images.

关键词： Copyright Protection Image Anti-Theft Screenshot Animation Synthesis

Definition and verification of novel metastasis and recurrence related signatures of ccRCC: A multicohort study

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

Cancer Innovation 2022年第2期1卷 146-167页

作者： Aimin Jiang Qingyang Pang Xinxin Gan Anbang Wang zhenjie wu Bing Liu Peng Luo Le Qu Linhui Wang Department of Urology Changhai HospitalNaval Medical University(Second Military Medical University)ShanghaiChina Department of Urology Changzheng HospitalNaval Medical University(Second Military Medical University)ShanghaiChina Department of Urology The Third Affiliated HospitalNaval Medical University(Second Military Medical University)ShanghaiChina Department of Oncology Zhujiang HospitalSouthern Medical UniversityGuangzhouChina Department of Urology Affiliated Jinling HospitalMedical School of Nanjing UniversityNanjingChina

Background:Cancer metastasis and recurrence remain major challenges in renal carcinoma patient *** are limited biomarkers to predict the metastatic probability of renal cancer,especially in the early-stage ***,our study applied robust machine-learning algorithms to identify metastatic and recurrence-related signatures across multiple renal cancer cohorts,which reached high accuracy in both training and testing ***:Clear cell renal cell carcinoma(ccRCC)patients with primary or metastatic site sequencing information from eight cohorts,including one outhouse cohort,were enrolled in this *** robust machine-learning algorithms were applied to identify metastatic ***,two distinct metastatic-related subtypes were identified and verified;matrix remodeling associated 5(MXRA5),as a promising diagnostic and therapeutic target,was investigated in vivo and in ***:We identified five stable metastasis-related signatures(renin,integrin subunit beta-like 1,MXRA5,mesenchyme homeobox 2,and anoctamin 3)from multicenter ***,we verified the specificity and sensibility of these signatures in external and out-house cohorts,which displayed a satisfactory *** to these metastatic signatures,patients were grouped into two distinct and heterogeneous ccRCC subtypes named metastatic cancer subtype 1(MTCS1)and type 2(MTCS2).MTCS2 exhibited poorer clinical outcomes and metastatic tendencies than *** addition,MTCS2 showed higher immune cell infiltration and immune signature expression but a lower response rate to immune blockade therapy than *** MTCS2 subgroup was more sensitive to saracatinib,sunitinib,and several molecular targeted *** addition,MTCS2 displayed a higher genome mutation burden and ***,we constructed a prognosis model based on subtype biomarkers,which performed well in training and validation ***,MXRA5,as a promising biomarker,significant

关键词： clear cell renal cell carcinoma metastasis recurrence machine learning multiple omics single‐cell sequencing