检索结果-南通市图书馆

Efficiency Comparison and influencing factor Analysis of Dairy Farms over/at Different Scales:Based on the Survey Data of 263 Scale Farms in 22 Provinces of China

引用

Asian Agricultural Research 2021年第7期13卷 1-8页

作者： Jing WANG Xiaoxia DONG Hua PENG Jing ZHANG Chao ZHANG Hao LIU Institute of Agricultural Information Chinese Academy of Agricultural Sciences Beijing 100081 China School of Agriculture and Food Sciences the University of Queensland Brisbane 4072 Australia

China's dairy farming has presented a striking development in recent *** the dual constraints of environment and resources,it is of practical significance to increase the output of dairy farming and ensure the healthy and stable development of the dairy industry,by accurately comparing the differences in the farming efficiency of dairy farms at different scales and grasping key factors influencing the farming *** study,through the cost analysis of 263 scale farms across 23 provinces and regions of China in 2019,reaches a result that the cost of a single cow in a certain scale farm increases with the enlargement of the scale,and shows an inverted-U shaped curve with the relatively large scales(1001-2000 cows)at the highest *** measures the farming efficiency of dairy farms at different scales through the data envelopment analysis and finds that the scale efficiency and allocation efficiency of scale farms in China are relatively high,while the technology efficiency and cost efficiency are relatively *** efficiency of different scale farms is obviously different,where the cost efficiency,allocation efficiency and scale efficiency show a U-shaped curve as the scale enlarges(with the relatively large scale as the lowest point),while the technology efficiency gradually decreases as the scale *** is concluded that for the scale farms,feed conversion ratio and forage-to-concentrate ratio have a significantly negative impact on the scale efficiency,while the labor cost,number of employees,and depreciation of fixed assets are negatively correlated to the technology efficiency and cost efficiency of dairy farming.

关键词： Data envelopment analysis Farming efficiency influencing factor Scale farm

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

Spatiotemporal characteristics and influencing factors of vegetation water use efficiency on the Tibetan Plateau in 2001–2020

引用

Journal of Geographical Sciences 2025年第1期35卷 39-64页

作者： HE Chenyang WANG Yanjiao YAN Feng LU Qi School of Ecological and Environmental Science East China Normal UniversityShanghai200241China Institute of Ecological Conservation and Restoration Chinese Academy of ForestryBeijing100091China National Climate Center China Meteorological AdministrationBeijing100081China

Water use efficiency(WUE),as a pivotal indicator of the coupling degree within the carbon–water cycle of ecosystems,holds considerable importance in assessment of the carbon–water balance within terrestrial ***,in the context of global warming,WUE evolution and its primary drivers on the Tibetan Plateau remain *** study employed the ensemble empirical mode decomposition method and the random forest algorithm to decipher the nonlinear trends and drivers of WUE on the Tibetan Plateau in 2001–*** indicated an annual mean WUE of 0.8088 gC/mm·m^(2)across the plateau,with a spatial gradient reflecting decrease from the southeast toward the *** manifesting monotonous trends of increase or decrease in WUE accounted for 23.64%and 9.69%of the total,***,66.67%of the region exhibited trend reversals,i.e.,39.94%of the area of the Tibetan Plateau showed transition from a trend of increase to a trend of decrease,and 26.73%of the area demonstrated a shift from a trend of decrease to a trend of *** factors accounted for 70.79%of the variability in *** leaf area index and temperature served as the major driving forces of WUE variation.

关键词： water use efficiency spatiotemporal characteristic influencing factor Tibetan Plateau

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

influencing factors and solution strategies of chimeric antigen receptor T-cell therapy(CAR–T)cell immunotherapy

引用

Oncology Research 2024年第9期32卷 1479-1516页

作者： ZHENGYI WANG LIANG ZHOU XIAOYING WU Department of Institute of Laboratory Animal Sciences Sichuan Provincial People’s HospitalUniversity of Electronic Science and Technology of ChinaChengduChina Ministry of Education and Training Chengdu Second People’s HospitalChengduChina

Chimeric antigen receptor T-cesll therapy(CAR–T)has achieved groundbreaking advancements in clinical application,ushering in a new era for innovative cancer ***,the challenges associated with implementing this novel targeted cell therapy are increasingly *** in the clinical management of solid tumors,obstacles such as the immunosuppressive effects of the tumor microenvironment,limited local tumor infiltration capability of CAR–T cells,heterogeneity of tumor targeting antigens,uncertainties surrounding CAR–T quality,control,and clinical adverse reactions have contributed to increased drug resistance and decreased compliance in tumor *** factors have significantly impeded the widespread adoption and utilization of this therapeutic *** this paper,we comprehensively analyze recent preclinical and clinical reports on CAR–T therapy while summarizing crucial factors influencing its ***,we aim to identify existing solution strategies and explore their current research *** this review article,our objective is to broaden perspectives for further exploration into CAR–T therapy strategies and their clinical applications.

关键词： Chimeric antigen receptor T-cell therapy(CAR-T) Tumor targeting therapy influencing factor Solution strategies

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

influencing factors for Erectile Dysfunction of Young Adults with No Response to PDE5i

引用

Current Medical Science 2021年第3期41卷 529-534页

作者： Jin WANG Yan-li WANG Yao HE Sen LI You-peng ZHANG Yong-biao CHENG Jia-lun GUO Lin SUN Yu XIN Yong TANG Zhao-hui ZHU Han-qing ZENG Department of Urology Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022China

Erectile dysfunction(ED)is a common male *** orally-administered phosphodiesterase type 5 inhibitors(PDE5 inhibitors)are now recognized as the primary pharmacological treatment method for ED,20%-30%of the patients treated with PDE5 inhibitors exhibit no significant *** study aims to investigate the influencing factors of ED in young adults with no response to PDE5 *** patients who would take PDE5 inhibitors were included and investigated with a *** with no response to PDE5 inhibitors(tadalafil and sildenafil)served as study group,and those with response to PDE5 inhibitors as control *** Chi square test and logistic regression analysis were applied to find the potential influencing *** total,378 ED patients were ***-three(24.6%)cases were non-responsive to PDE5 inhibitors,and the remaining 285(75.4%)responded to PDE5 *** multiple logistic regression analysis,we found that history of drinking(OR=3.152;95%CI 1.672-6.975),spousal noncooperation(OR=2.994;95%CI 1.589-5.638),number of fixed sex partners(OR=0.358;95%CI 0.132-0.651),duration of ED(OR=3.356;95%CI 1.352-8.333),and depression(OR=3.689;95%CI 1.579-8.979)could be the influencing factors for ED patients’non-response to PDE5 *** conclusion,history of drinking,spousal noncooperation,number of fixed sex partner,long duration of ED,and depression could be the influencing factors for ED patients'non-response to PDE5 *** and doctors should pay attention to these factors.

关键词： erectile dysfunction PDE5 inhibitors influencing factor

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

influencing factors of infrared surveying in roadway

引用

Journal of Coal Science & Engineering(China) 2006年第1期12卷 49-51页

作者：蔡康旭郭达 College of Resource and Safety Engineering Hunan University of Science and Technology Xiangtan 411201 China Kailuan Group Limited Responsibility Company Tangshan 063018 China

The main factors that affect infrared surveying in roadway include that property of rock, electromechanical equipments running, environmental temperature, hydrogeology and support material etc. This paper sums up the expression features of these disturbing factor through theoretical analysis and actual measurement contrasts and considers that some tunnel section does not suit to go on infrared survey, for instance, soft rock meets water to expanse, and surround rock has obviously pouring water. The basic methods had made evading disturbing of electromechanical equipments, environmental temperature and protect material etc to become possible. It is helpful that offers infrared surveying technical service for production safety better in roadway.

关键词： roadway infrared survey influencing factor analysis

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

Prototype observation and influencing factors of environmental vibrationinduced by flood discharge

引用

Water Science and Engineering 2017年第1期10卷 78-85页

作者： Xin Wang Ya-an Hu Shao-ze Luo Lu-chen Zhang Bo Wu Hydraulic Engineering Department Nanjing Hydraulic Research InstituteNanjing 210029China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Nanjing Hydraulic Research InstituteNanjing 210029China Key Laboratory of Navigation Structure Construction Technology of Ministry of Transport Nanjing Hydraulic Research InstituteNanjing 210029China

Due to a wide range of field vibration problems caused by flood discharge at the Xiangjiaba Hydropower Station, vibration characteristics and influencing factors were investigated based on prototype observation. The results indicate that field vibrations caused by flood discharge have distinctive characteristics of constancy, low frequency, small amplitude, and randomness with impact, which significantly differ from the common high-frequency vibration characteristics. Field vibrations have a main frequency of about 0.5-3.0 Hz and the characteristics of long propagation distance and large-scale impact. The vibration of a stilling basin slab runs mainly in the vertical direction. The vibration response of the guide wall perpendicular to the flow is significantly stronger than it is in other directions and decreases linearly downstream along the guide wall. The vibration response of the underground turbine floor is mainly caused by the load of unit operation. Urban environmental vibration has particular distribution characteristics and change patterns, and is greatly affected by discharge, scheduling modes, and geological conditions. Along with the increase of the height of residential buildings, vibration responses show a significant amplification effect. The horizontal and vertical vibrations of the 7th floor are, respectively, about 6 times and 1.5 times stronger than the corresponding vibrations of the 1st floor. The vibration of a large-scale chemical plant presents the combined action of flood discharge and working machines. Meanwhile, it is very difficult to reduce the low-frequency environmental vibrations. Optimization of the discharge scheduling mode is one of the effective measures of reducing the flow impact loads at present. Choosing reasonable dam sites is crucial.

关键词： Flood discharge Environmental vibration Vibration characteristics influencing factor Prototype observation

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

Indoor air particles in research vessel from Shanghai to Antarctic: Characteristics, influencing factors, and potential controlling pathway

引用

Journal of Environmental Sciences 2023年第4期126卷 784-793页

作者： Xudong Wu Fange Yue Jiancheng Wang Xiawei Yu Hongwei Liu Weihua Gu Mingming Han Juan Li Zhouqing Xie Anhui Key Laboratory of Polar Environment and Global Change Department of Environmental Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026China Department of Anesthesiology the First Affiliated Hospital of University of Science and Technology of ChinaHefei 230001China Center for Excellence in Urban Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China

Despite millions of seafarers and passengers staying on ships each year, few studies have been conducted on the indoor air quality inside ship hulls. In this study, we investigated the levels and size distribution of indoor particulate matter during two cruises of the research vessel “Xuelong” from Shanghai to Antarctica. The results showed that the particle size less than 2.5 μm(PM_(2.5)), and particle size less than 10 μm(PM_(10)) concentrations in different rooms of the ship widely varied. We observed high particulate matter(PM) levels in some of the rooms. The mass concentration distribution was dominated by 1–4 μm particles, which may have been caused by the hygroscopic growth of fine particles. The dominant factors influencing PM concentrations were indoor temperature, relative humidity, and human activity. We quantified contributions of these factors to the levels of indoor particles using a generalized additive model. In clean rooms, the levels of indoor particles were controlled by temperature and relative humidity, whereas in polluted rooms, the levels of indoor particles were mainly influenced by temperature and human activity, which implied that controlling temperature and human activity would efficiently reduce the levels of indoor particles.

关键词： Indoor air Ship influencing factor Generalized additive model(GAM) Quantification Controlling pathway

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

Spatial-temporal Characteristics of Green Development Efficiency and influencing factors in Restricted Development Zones:A Case Study of Jilin Province,China

引用

Chinese Geographical Science 2020年第4期30卷 736-748页

作者： LI Ping TONG Lianjun GUO Yanhua GUO Fuyou Northeast Institute of Geography and Agroecology Chinese Academy of SciencesChangchun 130102China University of Chinese Academy of Sciences Beijing 100049China Urban Development Institute Jilin Province Academy of Social SciencesChangchun 130000China College of Geographical Science Northeast Normal UniversityChangchun 130024China College of Geography and Tourism Qufu Normal UniversityRizhao 276826China

Green development is an important issue of sustainable development in *** to the relatively backward economy and the fragile ecological environment,restricted development zones need to embrace green *** 38 counties in Jilin Province as the empirical research objects,and based on cross-sectional data for each county in 2005,2010,and 2015,we accurately depicted the spatiotemporal evolutionary characteristics of green development efficiency(GDE)in restricted development zones of Jilin Province using the slacks-based measure-data envelope analysis(SBM-DEA)***,the factors that influence GDE were further analyzed using the Tobit *** found that:first,GDE showed a V-shaped trend in restricted development zones of Jilin *** differences in GDE in the eastern,central,and western Jilin Province increased ***,76%of counties in the restricted development zones had high or higher *** resource-based cities were the main areas with low or lower ***,the economic development level was the core factor affecting *** level had a significant negative effect on GDE in the restricted development *** effect of technological innovation level on GDE fluctuated,and we found that a‘backward mechanism’of technological innovation was beginning to *** structure and environmental governance had no significant effects on GDE.

关键词： green development efficiency spatiotemporal evolution influencing factor restricted development zones Jilin Province

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

Value and influencing factors of valid Traditional Chinese Medicine compound prescription patents for mammary gland hyperplasia

引用

Journal of Traditional Chinese Medicine 2022年第6期42卷 1012-1018页

作者： YANG Xujie PEI Xiaohua Department of Traditional Chinese Medical History Documents Hebei University of Chinese MedicineShijiazhuang 050200China Surgical Department Xiamen Hospital Affiliated to Beijing University of Chinese MedicineXiamen 361009China

OBJECTIVE: To explore the value and factors influencing the maintenance of valid Traditional Chinese Medicine compound prescription patents for the management of mammary gland hyperplasia. METHODS: The State Intellectual Property Office Patents Database, China Patent Information Center Patents Database, Soopat Patent Search Platform, and CNIPR Search Platform of Chinese and Foreign Patent Database were searched to identify Traditional Chinese Medicine compound prescription patents for mammary gland hyperplasia that had been maintained for at least 5 years. Logistic regression analysis was used to detect the factors influencing the maintenance of valid patents. RESULTS: From 1 January 1993 to 31 December 2019, a total of 1228, Traditional Chinese Medicine compound prescription patents for mammary gland hyperplasia were authorized. Of these applications, 381 patents were granted and only 176 patents were maintained for more than 5 years. The five independent variables assessed in this study all had significant explanatory functions. CONCLUSIONS: The maintenance of valid patents for Traditional Chinese Medicine compound prescriptions for treating mammary gland hyperplasia is of great importance. The maintenance of such patents depends on many factors, such as the concentration of effective herbs, number of dependent claims, provision of new dosage forms and detailed experimental data, and transfer of patent rights.

关键词： logistic models mammary glands human hyperplasia patent Traditional Chinese Medicine compound prescription influencing factor

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

Spatial Distribution Pattern and influencing factors of Physical Bookstores of Large Cities:A Case Study of Three National Central Cities in Western China

引用

Chinese Geographical Science 2023年第6期33卷 1082-1094页

作者： LIU Ruikuan LI Jiuquan CHANG Fang MA Jiayao College of Urban and Environmental Sciences Northwest UniversityXi’an710127China School of Tourism&Research Institute of Human Geography Xi’an International Studies UniversityXi’an710128China

As cultural facilities,physical bookstore is an important part of urban *** by the development of social economy and the internet,physical bookstores also have become a combination of cultural space and tourism *** this case,it is necessary to explore the spatial characteristics and influencing factors of physical *** study uses Density-Based Spatial Clustering of Applications with Noise(DBSCAN),spatial analysis and geographical detectors to calculate the spatial distribution pattern and factors influencing physical bookstores in national central cities/municipality(hereafter using cities)in western *** on spatial data,population density,road density and other data,this study constructed a data set of the influencing factors of physical bookstores,consisting of 11 factors along 6 dimensions for 3 national central cities in western *** results are as follows:first,the spatial distribution pattern of physical bookstores in Xi’an,Chengdu,and Chongqing is *** spatial distribution of physical bookstores in Xi’an and Chongqing is from southwest to northeast and are relatively clustered,while those in Chengdu are relatively ***,the spatial distribution pattern of physical bookstores has been formed under the influence of different *** intensity and significance of influencing factors differ in the case ***,in general,the social factor,business factor,the density of research facilities,tourism factor and road density are the main driving factors in the three *** is a synergistic relationship between public libraries and physical ***,the explanatory power becomes stronger after the interaction between various *** Xi’an and Chengdu,the density of communities and the density of research facilities have stronger explanatory power for the dependent variable after interacting with other ***,in Chongqing,the traffic factors have stronger expl

关键词： spatial characteristics physical bookstores influencing factor Density-Based Spatial Clustering of Applications with Noise(DBSCAN) geographical detectors Xi’an Chengdu Chongqing

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：