检索结果-南通市图书馆

Vehicle actuation based short-term traffic flow prediction model for signalized intersections

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2012年第1期19卷 287-298页

作者： SUN Jian zhang lun Transportation Research Center School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China School of Transportation Engineering Tongji UniversityShanghai 201804China

Traffic flow prediction is an important component for real-time traffic-adaptive signal control in urban arterial *** exploring available detector and signal controller information from neighboring intersections,a dynamic data-driven flow prediction model was *** model consists of two prediction components based on the signal states(red or green) for each movement at an upstream *** characteristics of each signal state were carefully examined and the corresponding travel time from the upstream intersection to the approach in question at the downstream intersection was *** an online turning proportion estimation method,along with the predicted travel times,the anticipated vehicle arrivals can be forecasted at the downstream *** model performance was tested at a set of two signalized intersections located in the city of Gainesville,Florida,USA,using the CORSIM microscopic simulation *** results show that the model agrees well with empirical arrival data measured at 10 s intervals within an acceptable range of 10%-20%,and show a normal *** is reasonably believed that the model has potential applicability for use in truly proactive real-time traffic adaptive signal control systems.

关键词： adaptive signal control least-squared estimation microscopic simulation travel flow prediction urban arterials

Interlayer material technology of manganese phosphate toward and beyond electrochemical pseudocapacitance over energy storage application

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2021年第12期71卷 109-128页

作者： Xu Bao Wei-Bin zhang Qiang zhang lun zhang Xue-Jing Ma Jianping Long College of Materials and Chemistry&Chemical Engineering Chengdu University of TechnologyChengdu 610059China

Manganese phosphates have shown excellent performances and great potential in electrochemical energy storage,which are demonstrated by research works published in recent *** manganese phosphates,the open-framework structures with large channels and cavities endow them with good ion conductivity and charge storage *** this review,we present the recent progress on manganese phosphates,by focusing on their advantages/disadvantages and potential applications as a new class of electrode materials in *** structural characteristics,synthesis methods,and mineral sources to prepare these manganese phosphates are investigated,together with the modification,as they strongly affect the electrochemical energy storage *** are paid to those hybrid-type materials,where strong synergistic effects *** the summary,interlayer engineering for the manganese phosphates and hybrid-types are proposed and discussed.

关键词： Manganese phosphate Layer structure Interlayer technology Pseudocapacitance Supercapacitor Energy storage

Aggregation of CeAlO_(3) inclusions in heavy ingot of a steel containing 0.007% aluminum

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2024年第8期31卷 1960-1972页

作者： Qiu-yue Zhou Jun-tao Ba lun zhang Wei Chen Ying Ren Li-feng zhang School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004HebeiChina School of Mechanical and Materials Engineering North China University of TechnologyBeijing 100144China

The distribution of inclusions at the bottom of a Ce-treated heavy steel ingot was detected and *** three-dimensional morphology and spatial distribution of CeAlOs clusters were characterized using the electrolytic extraction and Micro-CT detection.A model of inclusion collision to predict the aggregation of CeAlO_(3) inclusions in the ingot was established and validated by measured *** were mainly CeAlO_(3) and a small amount of Ce_(2)O_(2)S in the tundish after cerium *** collision and aggregation of inclusions led to the formation of large clusters in the ingot during the solidification *** slag entrainment inclusions,large CeAO_(3) clusters and small CeAlO_(3) particles were observed from the center to the edge of the ingot *** inclusions were mainly concentrated at the *** number density of inclusions larger than 200μm was 0.21 mm^(-3).The maximum diameter of CeA1O_(3) clusters was 1340μ*** the edge to the radial center and from the bottom to the top,the average diameter of inclusions gradually increased due to the longer solidification time of the ingot.

关键词： Inclusion Heavy ingot Cerium treatment Collision

Boosting the energy density of sulfide-based all-solid-state batteries at low temperatures by charging to high voltages up to 6 V

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2023年第8期16卷 10966-10975页

作者： lun zhang Xuedong zhang Zhaoyu Rong Tao Wang Zhenyu Wang Zaifa Wang Longchen zhang Qiao Huang Lingyun Zhu Liqiang zhang Yongfu Tang Jianyu Huang Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education School of Materials Science and EngineeringXiangtan UniversityXiangtan 411105China Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China Guilin Electrical Equipment Scientific Research Institute Co. LtdGuilin 541004China GRINM(Guangdong)Institute for Advanced Materials and Technology Foshan 528000China Hebei Key Laboratory of Applied Chemistry College of Environmental and Chemical EngineeringYanshan UniversityQinhuangdao 066004China School of Materials Science&Engineering Anhui UniversityHefei 230601China

Sulfide electrolyte-based all-solid-state batteries(ASSBs)are potential next generation energy storage technology due to the high ionic conductivity of sulfide electrolytes and potentially improved energy density and ***,the performance of ASSBs at/below subzero temperatures has not been explored ***,low temperature(LT)performance of LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)|Li_(9.54)Si_(1.74)P_(1.44)S11.7Cl_(0.3)(LiSPSCl)|Li_(4)Ti_(5)O_(12)(LTO)ASSBs was *** charging the ASSB to 6 V at−40℃,a capacity of 100.7 mAh∙g^(−1)at 20 mA∙g^(−1)was achieved,which is much higher than that charged to 4.3 V(4.6 mAh∙g^(−1))at−40℃.Moreover,atomic resolution microscopy revealed that the NCM811 remained almost intact even after being charged to 6 *** contrast,NCM811 was entirely destructed when charged to 6 V at room *** sharp difference arises from the large internal charge transfer resistance at LT which requires high voltage to ***,such high voltage is not harmful to the active material but beneficial to extracting most energy out of the ASSBs at *** also demonstrated that thinner electrolyte is favorable for LT operation of ASSBs due to the reduced ion transfer *** work provides new strategies to boost the capacity and energy density of sulfide-based ASSBs at LT for dedicated LT applications.

关键词： all-solid-state lithium batteries sulfide solid electrolyte low temperature Li_(4)Ti_(5)O_(12)(LTO)

Turbulent heat fluxes in the North Water Polynya and ice estimated based on ASRv2 data and their impact on cloud

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Climate Change Research 2024年第5期15卷 798-814页

作者： Hai-Yi REN Mohammed SHOKR Tian-Yu zhang Zhi-lun zhang Feng-Ming HUI Xiao CHENG School of Geospatial Engineering and Science Sun Yat-sen UniversitySouthern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Zhuhai 519082China Key Laboraory of Comprehensive Obseration of Polar Environment(Sun Yat-en University)Minisry of Education Zhuhai 519082 China State Key Laboratory of Remote Sensing Science Faculty of Geographical ScienceBeijing Normal UniversityBeijing 100875China State Key Laboratory of Space-Ground Integrated Information Technology Beijing Institute of Satllite Information Engineering Beijing 100086China Science and Technology Branch Environment CanadaToronto Ontario M3H5T4Canada

The presence or absence of sea ice introduces a substantial perturbation to surface-atmosphere energy *** the effect of varying sea ice cover on surface-atmosphere interactions is an important consideration for understanding the Arctic climate *** recurring North Water Polynya(NOW)serves as a natural laboratory for isolating cloud responses to a rapid,near-step perturbation in sea *** this study,we employed high-resolution Arctic System Reanalysis version 2(ASRv2)data to estimate turbulent heat fluxes over the NOW and nearby sea ice(NSI)area between 2005/2006 and 2015/*** results indicate that the average turbulent heat fluxes in the polynya are about 87%and 86%higher than in the NSI area over the 10 years during the entire duration of the polynya and during polar night,*** turbulent heat fluxes from the polynya tend to produce more low-level *** relationship between the polynya and low cloud in winter was examined based on Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations(CALIPSO).The low-cloud fraction(0-2 km)was about 7%-34%larger over the polynya than the NSI area,and the ice water content below 200 m was about 250%-413%higher over the former than the *** correlation between cloud fraction and turbulent heat fluxes in the polynya peaks around the altitude of 200-300 *** results suggest that the NOW affects the Arctic boundary layer cloudiness and structure in ***,higher horizontal resolution reanalysis data can advance our understanding of the cloud-polynya response.

关键词： The North Water Polynya Turbulent heat fluxes Cloud cover Ice water content ASRv2 CALIPSO

CeO_(2)-clay composites for ultra-long cycle life electrochemical capacitive energy storage application

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 Rare Earths 2023年第5期41卷 728-739,I0004页

作者： Shan-Shan Chai Wei-Bin zhang Jing-Lei Yang lun zhang Xiong-Wei Han Myat Myintzu Theint Xue-Jing Ma College of Materials and Chemistry&Chemical Engineering Chengdu University of TechnologyChengdu 610059China Mineral Development Section for the International Relation Department of MinesMinistry of Natural Resources and Environmental ConversationNay Pyi Taw15011Myanmar

The lattice expansion caused by the reduction of Ce(Ⅳ)to Ce(Ⅲ)impeded the development of the CeO_(2)as an effective electrode material for electrochemical ***,we prepared CeO_(2)-clay composites through a one-step hydrothermal *** interlayer structures of clays efficiently accommodate volume changes induced by crystal lattice expansion to achieve ultra-long cycle *** 60000 charge-discharge cycles,the capacitance retention rate of the assembled asymmetric supercapacitors is as high as~-100%.The key findings of this work reveal the potential application of clays in achieving ultralong cycle stability of the CeO_(2)electrode material,paving the way for further application of the CeO_(2)in electrochemical energy storage.

关键词： Cerium dioxide Clay mineral Cycle life Electrochemical supercapacitor Rareearths

Sixty-four-slice computed tomography in surgical strategy of portal vein cavernous transformation

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2011年第38期17卷 4334-4338页

作者： Ming-Man zhang Cong-lun Pu Ying-Cun Li Chun-Bao Guo Department of Hepatobiliary Surgery Children＇s hospitalChongqing Medical University Chongqing 400014 China

AIM:To investigate the role of 64-slice computed tomography(CT) in portal vein cavernous transformation to determine surgical ***:The site of lesions and extent of collateral circulation in 12 pediatric cases of cavernous transformation of the portal vein with surgical treatment were ***:Eleven of 12 children had esophageal varices and were treated with lower esophageal and gastric devascularization and splenectomy,and the other case was only treated with *** were eight cases with spontaneous spleen/stomach-renal shunt,four with Retzius vein opening,which was reserved during *** cases of lesions involving the intrahepatic portal vein(PV) were treated with living donor liver *** patient died from PV thrombosis after liver transplantation,and the rest had no significant ***:The PV,its branches and collateral circulation were clearly seen by 64-slice spiral CT angiography,which helped with preoperative surgical planning.

关键词： Cavernous transformation Portal vein Co4-slicecomputed tomography Liver transplantation Portal hyper-tension Esophageal devascularization Gastric devascularization

Multi-physical fields distribution in billet during helical electromagnetic stirring:A numerical simulation research

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Foundry 2024年第1期21卷 51-59页

作者： Dong Pan Qing-tao Guo Kai-lun zhang Fu-zhi Yu Yu-ying Li Yu-bao Xiao State Key Laboratory of Metal Materials for Marine Equipment and Application Anshan 114009LiaoningChina Ansteel Beijing Research Institute Co. Ltd.Beijing 102200China

Electromagnetic stirring is one of the widely applied techniques to modify the quality of casting *** from conventional rotate stirring,the helical stirring is more professional in assisting multi-dimensional flow of molten metal and eliminating solidification *** this study,the single-winding helical stirring(SWHS)was introduced,offering advantages such as smaller volume and lower electromagnetic shielding compared to traditional helical stirring *** a comprehensive numerical simulation,the stirring parameters of SWHS were adjusted to yoke inclination angle of 43°and frequency of 12 *** higher electromagnetic force and flow velocity in drawing direction,as well as the lower temperature gradient induced by the SWHS,are positive factors for homogeneous solidification of *** experimental results on Al-8%Si alloy and 0.4%C-1.1%Mn steel demonstrate that compared to rotate stirring,the SWHS process can induce better billet quality and is more effective in accelerating the equiaxed expansion and reducing element *** SWHS process can enhance the equiaxed ratio of the billet by 58.3%and reduce segregation degree of carbon element by 10.97%.Consequently,SWHS holds great promise as a potential approach for improving the quality of continuous casting billets.

关键词： billet electromagnetic stirring helical solidification element segregation numerical simulation

Diagnostic Accuracy of Computerized Bowel Sound Analysis with Non-Invasive Devices for Irritable Bowel Syndrome:A Systematic Review and Meta-Analysis

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Sciences Journal 2024年第2期39卷 122-130页

作者： Xia-Xiao Yan Yue-lun zhang Yu-Pei zhang Ying-Yun Yang Dong Wu Department of Gastroenterology State Key Laboratory of Complex Severe and Rare DiseasesPeking Union Medical College HospitalChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100730China Eight-Year Medical Doctor Program Chinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100730China Medical Research Center Peking Union Medical College HospitalChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100730China

Objective To assess the diagnostic accuracy of bowel sound analysis for irritable bowel syndrome(IBS)with a systematic review and *** We searched MEDLINE,Embase,the Cochrane Library,Web of Science,and IEEE Xplore databases until September ***-sectional and case-control studies on diagnostic accuracy of bowel sound analysis for IBS were *** estimated the pooled sensitivity,specificity,positive likelihood ratio,negative likeli-hood ratio,and diagnostic odds ratio with a 95% confidence interval(CI),and plotted a summary receiver operat-ing characteristic curve and evaluated the area under the *** Four studies were *** pooled diagnostic sensitivity,specificity,positive likelihood ratio,nega-tive likelihood ratio,and diagnostic odds ratio were 0.94(95%CI,0.87‒0.97),0.89(95%CI,0.81‒0.94),8.43(95%CI,4.81‒14.78),0.07(95%CI,0.03‒0.15),and 118.86(95%CI,44.18‒319.75),respectively,with an area under the curve of 0.97(95%CI,0.95‒0.98).Conclusions Computerized bowel sound analysis is a promising tool for ***,limited high-quality data make the results'validity and applicability *** is a need for more diagnostic test accuracy studies and better wearable devices for monitoring and analysis of IBS.

关键词： irritable bowel syndrome bowel sound analysis diagnostic accuracy systematic review meta-analysis