检索结果-南通市图书馆

Landslide hazard susceptibility evaluation based on SBAS-InSAR technology and SSA-BP neural network algorithm:A case study of Baihetan Reservoir Area

引用

Journal of Mountain Science 2024年第3期21卷 952-972页

作者： GUO Junqi XI Wenfei yang Zhiquan SHI Zhengtao HUANG Guangcai yang zhengrong yang Dongqing Faculty of Geography Yunnan Normal UniversityKunming 650500China Key Laboratory of Early Rapid Identification Prevention and Control of Geological Diseases in Traffic Corridor of High Intensity Earthquake Mountainous Area of Yunnan ProvinceKunming 650093China Faculty of Public Safety and Emergency Management Kunming University of Science and TechnologyKunming 650093China Key Laboratory of Geological Disaster Risk Prevention and Control and Emergency Disaster Reduction of Ministry of Emergency Management of the People’s Republic of China Kunming University of Science and TechnologyKunming 650093China Guizhou Geological Survey Institute Guiyang 550081China College of Big Data and Intelligent Engineering Southwest Forestry UniversityKunming 650224China

Landslide hazard susceptibility evaluation takes on critical significance in early warning and disaster prevention and reduction.In order to solve the problems of poor effectiveness of landslide data and complex calculation of weights for multiple evaluation factors in the existing landslide susceptibility evaluation models,in this study,a method of landslide hazard susceptibility evaluation is proposed by combining SBAS-InSAR(Small Baseline Subsets-Interferometric Synthetic Aperture Radar)and SSA-BP(Sparrow Search Algorithm-Back Propagation)neural network algorithm.The SBAS-InSAR technology is adopted to identify potential landslide hazards in the study area,update the cataloging data of landslide hazards,and 11 evaluation factors are chosen for constructing the SSA-BP model for training and validation.Baihetan Reservoir area is selected as a case study for validation.As indicated by the results,the application of SBAS-InSAR technology,combined with both ascending and descending orbit data,effectively addresses the incomplete identification of landslide hazards caused by geometric distortion of single orbit SAR data(e.g.,shadow,overlay,and perspective contraction)in deep canyon areas,thereby enabling the acquisition of up-to-date landslide hazard data.Moreover,in comparison to the conventional BP(Back Propagation)algorithm,the accuracy of the model constructed by the SSA-BP algorithm exhibits a significant increase,with mean squared error and mean absolute error reduced by 0.0142 and 0.0607,respectively.Additionally,during the process of susceptibility evaluation,the SSA-BP model effectively circumvents the issue of considerable manual interventions in calculating the weight of evaluation factors.The area under the curve of this model reaches 0.909,surpassing BP(0.835),random forest(0.792),and the information value method(0.699).The risk of landslide occurrence in the Baihetan Reservoir area is positively correlated with slope,surface temperature,and deformation rate,while it is negatively correlated with fault

关键词： Baihetan SBAS-InSAR SSA-BP Landslide hazard susceptibility evaluation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Oral Sexual Behavior Among HIV-Infected Men Who Have Sex with Men--China,February 2021

引用

China CDC weekly 2022年第25期4卷 541-548页

作者： Leiwen Fu Jin Zhao Weiran Zheng Yinghui Sun Tian Tian Bingyi Wang Luoyao yang Xinyi Zhou Yi-Fan Lin zhengrong yang Hui Li Huachun Zou School of Public Health(Shenzhen) Sun Yat-sen UniversityShenzhenGuangdong ProvinceChina Shenzhen Center for Disease Control and Prevention ShenzhenGuangdong ProvinceChina Center for Disease Control and Prevention Shizhong DistrictJinanShandong ProvinceChina

Summary What is already known about this topic?Unprotected oral sex carries a risk of the transmission of sexually transmitted infections(STIs),especially if the individual has poor oral health.What is added by this report?Most human immunodeficiency virus(HIV)infected men who have sex with men(MSM)had never used a condom when giving oral sex(89.30%,718/804)or receiving oral sex(90.32%,709/785).Among MSM with detectable viral loads who had ever received oral sex without a condom,40.00%reported ejaculation in their partner’s mouth.

关键词： Infect protected infected

来源：

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

Integrative Self-Organizing Map—A Mean Pattern Model

引用

Engineering（科研） 2013年第10期5卷 244-249页

作者： Zihua yang zhengrong yang School of Biosciences University of Exeter Devon UK Wolfson Institute of Preventive Medicine University of Queen Mary London UK

We propose an integrative self-organizing map (iSOM) for exploring differential expression patterns across multiple microarray experiments. The algorithm is based on the assumption that observed differential expressions are random samples of a mean pattern model which is unknowna priori. The learning mechanism of iSOM is similar to the conventional SOM. The mean pattern model which underlies the proposed iSOM models mean differential expressions using a one-dimension of mean differential expressions for the mean differential expressions. The feature map of an iSOM model can be used to reveal correlation between multiple medically/biologically related disease types or multiple platform experiments for one disease. We illustrate applications of iSOM using simulated data and real data.

关键词： Integrative Study of Microarrays Pattern Discovery Differential Expressions Self-Organizing Map

来源：

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

深圳市男男性行为者HIV暴露后预防的使用:一项系列横断面研究

引用

中国艾滋病性病 2024年第1期30卷 18-22页

作者：戴德磊杨梓杰张燕谭唯杨峥嵘刘少础谢炜卫兰李思美袁苑袁小洪唐虎朱悦赵锦汕头大学公共卫生学院广东汕头515063 深圳市疾病预防控制中心广东深圳518000 北京大学北京100083 中山大学公共卫生学院广州510080 山西医科大学公共卫生学院山西太原030607 南方医科大学广州510515

目的分析2020-2022年深圳市MSM的nPEP使用情况及其影响因素。方法2020年1月至2022年12月,在深圳市通过与社会组织合作招募MSM开展问卷调查,收集人口学、行为学以及nPEP使用等信息。采用χ2检验和Logistic回归分析nPEP使用的影响因素。... 详细信息

目的分析2020-2022年深圳市MSM的nPEP使用情况及其影响因素。方法2020年1月至2022年12月,在深圳市通过与社会组织合作招募MSM开展问卷调查,收集人口学、行为学以及nPEP使用等信息。采用χ2检验和Logistic回归分析nPEP使用的影响因素。结果共2900名研究对象纳入分析,2020-2022年深圳市MSM中三年的nPEP使用率依次为7.00%(55/787)、5.00%(59/1183)和5.59%(52/930)。多因素Logistic回归结果显示:有药物滥用(aOR=1.720,95%CI:1.242~2.381)、近一年在诊所或男同场所接受艾滋病相关服务(aOR=1.741,95%CI:1.068~2.836)、有启动PrEP的意愿(aOR=3.299,95%CI:2.256~4.832)、过去一年确诊患有性传播疾病(aOR=1.849,95%CI:1.139~3.000)、有做包皮环切术的历史(aOR=1.591,95%CI:1.029~2.459)的MSM使用nPEP的概率更高,而有固定性伴侣的MSM(aOR=0.532,95%CI:0.375~0.755)、有套肛交性行为(aOR=0.377,95%CI:0.230~0.619)使用nPEP的概率更低。结论2020-2022年深圳市MSM的nPEP使用率不高,有必要开展针对性的教育宣传,重点关注有固定性伴侣和有套肛交性行为的人群,提高nPEP使用率。

关键词：艾滋病病毒非职业暴露后预防男男性行为者影响因素

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

保护播种对苜蓿当年生产性能及根系特征的影响

引用

中国饲料 2024年第13期 155-161页

作者：郭天斗常生龙杨正荣陈永岗柴锦隆马晓东王飞李东琴郭长辉朱帆李刚甘肃亚盛农业研究院有限公司甘肃兰州730030 甘肃亚盛实业(集团)股份有限公司农业农村部耕地保育技术重点实验室甘肃兰州730030 甘肃亚盛田园牧歌草业集团有限责任公司甘肃酒泉735000 甘肃亚盛实业(集团)股份有限公司黄花分公司甘肃玉门735218 甘肃亚盛实业(集团)股份有限公司饮马分公司甘肃玉门735218

为探究适宜于阿旗地区种植的燕麦与苜蓿最佳混播比例,以单播苜蓿(CK)为对照,研究了5、6、7 kg(YM5、YM6、YM7)燕麦亩播量与苜蓿保护播种对苜蓿当年生产性能及根系特征的影响。结果表明:在第二茬牧草中,CK株高显著高于其他处理组(P20 cm... 详细信息

为探究适宜于阿旗地区种植的燕麦与苜蓿最佳混播比例,以单播苜蓿(CK)为对照,研究了5、6、7 kg(YM5、YM6、YM7)燕麦亩播量与苜蓿保护播种对苜蓿当年生产性能及根系特征的影响。结果表明:在第二茬牧草中,CK株高显著高于其他处理组(P20 cm土层之间地下生物量无显著差异外(P>0.05),其余同一处理不同土层之间均存在显著差异(P20 cm土层地下生物量最大的均为YM5。综合评价表明,保护播种可有效提高苜蓿生产性能,改善苜蓿根系特征,从第二茬苜蓿生产性能来看,保护播种组合以YM7最佳;从苜蓿根系特征来看,保护播种组合以燕麦YM5最佳,因此,为考虑新播苜蓿高效返青与可持续利用,最适宜于阿旗地区推广种植的组合为YM5。

关键词：保护播种苜蓿燕麦生产性能根系特征综合评价

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Online task planning method of anti-ship missile based on rolling optimization

引用

Journal of Systems Engineering and Electronics 2024年第3期35卷 720-731页

作者： LU Faxing DAI Qiuyang yang Guang JIA zhengrong College of Weaponry Engineering Naval University of EngineeringWuhan 430033China

Based on the wave attack task planning method in static complex environment and the rolling optimization framework, an online task planning method in dynamic complex environment based on rolling optimization is proposed. In the process of online task planning in dynamic complex environment,online task planning is based on event triggering including target information update event, new target addition event, target failure event, weapon failure event, etc., and the methods include defense area reanalysis, parameter space update, and mission re-planning. Simulation is conducted for different events and the result shows that the index value of the attack scenario after re-planning is better than that before re-planning and according to the probability distribution of statistical simulation method, the index value distribution after re-planning is obviously in the region of high index value, and the index value gap before and after re-planning is related to the degree of posture change.

关键词： target allocation of anti-ship missile defense area rolling optimization task re-planning

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Optimal Initialization and Starting Approach of Synchronous Condenser Integrated Power Grid

引用

CSEE Journal of Power and Energy Systems 2024年第1期10卷 248-260页

作者： Puyu Wang Xing Liu Qingwen Mou Tao Yuan Tianming Gu Hemin yang Xiao-Ping Zhang zhengrong Xiang Chunyi Guo School of Automation Nanjing University of Science and TechnologyNanjing 210094China NARI Group Corporation/State Grid EPRI and also with NARI Technology Co.Ltd. Nanjing 211106China School of Engineering University of BirminghamBirminghamB152TTUnited Kingdom State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China

Synchronous condensers(SCs)are generally used at the receiving-end stations of ultra-high-voltage direct current(UHVDC)transmission systems due to their strong reactive power support and flexible regulation of reactive power according to the interconnected grids operating conditions.In this paper,different starting control schemes of a SC integrated power grid are investigated providing four main contributions:1)The principle of reactive power support of the SC on the interconnected power grid is analytically studied,providing the establishment of mathematical models.2)Four different starting control schemes are developed for the initialization and SC integration,i.***.in Scheme 1,a preset initial falling speed is directly utilized without initialization;in Scheme 2,a black start sequential control approach with a static frequency converter(SFC)is proposed;in Scheme 3,PI/PD/PID controllers are respectively applied for the excitation device at the speed-falling stage;in Scheme 4,a pre-insertion approach of an energy absorption component with R/L/RL is utilized to suppress the surges at the SC integration instant.3)The dynamic behaviors of four different starting schemes at specific operating stages are evaluated.4)The success rate of SC integration is analyzed to evaluate starting control performance.Performance of the SC interconnected system with four different starting control schemes is evaluated in the timedomain simulation environment PSCAD/EMTDC^(TM).The results prove the superiority of the proposed starting control approach in Scheme 4.

关键词： Black start dynamic behaviors excitation system pre-insertion of energy absorption components starting control schemes static frequency converter(SFC) success rate of integration synchronous condenser(SC)

来源：

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

Phenology of different types of vegetation and their response to climate change in the Qilian Mountains,China

引用

Journal of Mountain Science 2024年第2期21卷 511-525页

作者： ZHAO Kaixin LI Xuemei ZHANG zhengrong LIU Xinyu Faculty of Geomatics Lanzhou Jiaotong UniversityLanzhou 730070China National-Local Joint Engineering Research Center of Technologies and Applications for National Geographic State Monitoring Lanzhou 730070China Gansu Provincial Engineering Laboratory for National Geographic State Monitoring Lanzhou 730070China

The Qilian Mountains(QM)possess a delicate vegetation ecosystem,amplifying the evident response of vegetation phenology to climate change.The relationship between changes in vegetation growth and climate remains complex.To this end,we used MODIS NDVI data to extract the phenological parameters of the vegetation including meadow(MDW),grassland(GSD),and alpine vegetation(ALV))in the QM from 2002 to 2021.Then,we employed path analysis to reveal the direct and indirect impacts of seasonal climate change on vegetation phenology.Additionally,we decomposed the vegetation phenology in a time series using the trigonometric seasonality,Box-Cox transformation,ARMA errors,and Trend Seasonal components model(TBATS).The findings showed a distinct pattern in the vegetation phenology of the QM,characterized by a progressive shift towards an earlier start of the growing season(SOS),a delayed end of the growing season(EOS),and an extended length of the growing season(LOS).The growth cycle of MDW,GSD,and ALV in the QM species is clearly defined.The SOS for MDW and GSD occurred earlier,mainly between late April and August,while the SOS for ALVs occurred between mid-May and mid-August,a one-month delay compared to the other vegetation.The EOS in MDW and GSD were concentrated between late August and April and early September and early January,respectively.Vegetation phenology exhibits distinct responses to seasonal temperature and precipitation patterns.The advancement and delay of SOS were mainly influenced by the direct effect of spring temperatures and precipitation,which affected 19.59%and 22.17%of the study area,respectively.The advancement and delay of EOS were mainly influenced by the direct effect of fall temperatures and precipitation,which affected 30.18%and 21.17%of the area,respectively.On the contrary,the direct effects of temperature and precipitation in summer and winter on vegetation phenology seem less noticeable and were mainly influenced by indirect effects.The indirect effect of winter precipitation is the main fac

关键词： Vegetation phenology Time series decomposition Path Analysis Climate change

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The Effects of Thickness and Location of PCMon the Building’s Passive Temperature-Control–A Numerical Study

引用

Energy Engineering 2024年第3期121卷 681-702页

作者： zhengrong Shi JieRen Tao Zhang Yanming Shen College of Energy and Mechanical Engineering Shanghai University of Electric PowerShanghai201306China Research and Development Center Heatmate New Energy Technology Co.Ltd.Shanghai200090China Shanghai Non-Carbon Energy Conversion and Utilization Institute Shanghai Jiao Tong UniversityShanghai200240China

Building energy consumption and building carbon emissions both account for more than 20%of their total national values in China.Building employing phase change material(PCM)for passive temperature control shows a promising prospect in meeting the comfort demand and reducing energy consumption simultaneously.However,there is a lack of more detailed research on the interaction between the location and thickness of PCM and indoor natural convection,as well as indoor temperature distribution.In this study,the numerical model of a passive temperature-controlled building integrating the developed PCM module is established with the help of ANSYS.In which,the actual weather condition of Beijing city is set as the boundary conditions and the indoor natural convection is simulated with the consideration of radiation model.The effects of PCM’s thickness and location on the internal temperature field are analyzed and discussed.The results show that the room could maintain within the human comfort temperature range with the longest ratio of 94.10%and the shortest ratio of 51.04%as integrating PCM.In comparison,the value is only 26.70%without PCM.The room’s maximum temperature fluctuation can also be improved;it could be lowered by 64.4%compared to the normal condition.When the quantity of PCM is sufficient,further increasing the PCM amount results in a temperature fluctuation reduction of less than 0.1°C and does not increase the comfort time.Placing PCM on the wall induces an apparent variation in indoor temperature along the vertical direction.Conversely,placing PCM on the roof can lead to a heat transfer rate difference of up to seven times.The optimal placement of PCM depends on the difference between the environmental and phase change temperatures.If the difference is positive,placing PCM on the roof is more effective;conversely,the opposite holds.According to the results over the entire cycle,PCM application on vertical walls yields better performance.The significant difference in natural convection caused by the same t

关键词： Phase change materials passive temperature regulation numerical simulation temperature field

来源：

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

A CMIP6-based assessment of regional climate change in the Chinese Tianshan Mountains

引用

Journal of Arid Land 2024年第2期16卷 195-219页

作者： LIU Xinyu LI Xuemei ZHANG zhengrong ZHAO Kaixin LI Lanhai Faculty of Geomatics Lanzhou Jiaotong UniversityLanzhou 730070China National-Local Joint Engineering Research Center of Technologies and Applications for National Geographic State Monitoring Lanzhou 730070China Gansu Provincial Engineering Laboratory for National Geographic State Monitoring Lanzhou 730070China State Key Laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China Research Center for Ecology and Environment of Central Asia Chinese Academy of SciencesUrumqi 830011China

Climate warming profoundly affects hydrological changes,agricultural production,and human society.Arid and semi-arid areas of China are currently displaying a marked trend of warming and wetting.The Chinese Tianshan Mountains(CTM)have a high climate sensitivity,rendering the region particularly vulnerable to the effects of climate warming.In this study,we used monthly average temperature and monthly precipitation data from the CN05.1 gridded dataset(1961-2014)and 24 global climate models(GCMs)of the Coupled Model Intercomparison Project Phase 6(CMIP6)to assess the applicability of the CMIP6 GCMs in the CTM at the regional scale.Based on this,we conducted a systematic review of the interannual trends,dry-wet transitions(based on the standardized precipitation index(SPI)),and spatial distribution patterns of climate change in the CTM during 1961-2014.We further projected future temperature and precipitation changes over three terms(near-term(2021-2040),mid-term(2041-2060),and long-term(2081-2100))relative to the historical period(1961-2014)under four shared socio-economic pathway(SSP)scenarios(i.e.,SSP1-2.6,SSP2-4.5,SSP3-7.0,and SSP5-8.5).It was found that the CTM had experienced significant warming and wetting from 1961 to 2014,and will also experience warming in the future(2021-2100).Substantial warming in 1997 was captured by both the CN05.1 derived from interpolating meteorological station data and the multi-model ensemble(MME)from the CMIP6 GCMs.The MME simulation results indicated an apparent wetting in 2008,which occurred later than the wetting observed from the CN05.1 in 1989.The GCMs generally underestimated spring temperature and overestimated both winter temperature and spring precipitation in the CTM.Warming and wetting are more rapid in the northern part of the CTM.By the end of the 21st century,all the four SSP scenarios project warmer and wetter conditions in the CTM with multiple dry-wet transitions.However,the rise in precipitation fails to counterbalance the drought induced by escalating temperatu

关键词： climate change Coupled Model Intercomparison Project Phase 6(CMIP6) global climate models(GCMs) shared socio-economic pathway(SSP)scenarios standardized precipitation index(SPI) Chinese Tianshan Mountains

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：