检索范围:
排序: 展示方式:
Combined static mixers for high viscous fluids mixing
Zhenhao XI, Weizhen SUN, Ling ZHAO, Zhaoyan LIU
《化学科学与工程前沿(英文)》 2009年 第3卷 第1期 页码 93-96 doi: 10.1007/s11705-009-0112-x
关键词: static mixer Cross-over-Disc pressure drop mixing performance high viscous fluid
RESPONSE OF WHEAT COMPOSITE CROSS POPULATIONS TO DISEASE AND CLIMATE VARIATION OVER 13 GENERATIONS
《农业科学与工程前沿(英文)》 2021年 第8卷 第3期 页码 400-415 doi: 10.15302/J-FASE-2021394
Since the F5 (2005), three winter wheat composite cross populations (CCPs) based on germplasm specifically suitable for low-input conditions were subjected to natural selection under organic and conventional management. In the F6, each CCP was divided into two parallel populations (12 CCPs in total) and maintained continuously until 2018. Commonly used modern cultivars with different disease susceptibilities were grown alongside to assess the agronomic performance of the CCPs. The organically managed CCPs were comparable in yield and foliar disease resistance to two continuously used reference cultivars, Achat and Capo. In contrast, under conventional management the cv. Capo outyielded the CCPs (Achat was not tested), highlighting the importance of parental cultivar choice for specific management systems. The CCPs were found to be moderately resistant to brown rust and even to the newly emerged stripe rust races prevalent in Europe since 2011. Differences between the CCPs were mainly due to parental genetic background and were significant in the first five generations, but were no longer so in the last five generations. In addition, these differences tended to vary depending on the experimental year and the environmental stresses present. In conclusion, the CCPs despite being derived from older cultivars are able to compete with more recently released reference cultivars under organic farming practices and represent a dynamic germplasm resource.
关键词: evolutionary breeding heterogeneous crop population management system
Vibration analysis of blade-disc coupled structure of compressor
WANG Chunjie, SONG Shunguang, ZONG Xiao
《能源前沿(英文)》 2008年 第2卷 第3期 页码 302-305 doi: 10.1007/s11708-008-0064-8
关键词: blade-disc coupling assembly experiment vibration blade-disc structure
Wear mechanism of disc-brake block material for new type of drilling rig
WANG Xinhua, WANG Simin, ZHANG Siwei, WANG Deguo
《机械工程前沿(英文)》 2008年 第3卷 第1期 页码 10-16 doi: 10.1007/s11465-008-0009-2
关键词: asbestos-free frictional Fracture cyclization friction disc-brake
Analysis of load and adaptability of disc cutters during shield tunneling in soft–hard varied strata
《结构与土木工程前沿(英文)》 2023年 第17卷 第4期 页码 533-545 doi: 10.1007/s11709-023-0946-1
关键词: shield tunneling disc cutter load laboratory excavation test numerical calculation soft–hard varied strata
《结构与土木工程前沿(英文)》 页码 1370-1386 doi: 10.1007/s11709-023-0947-0
关键词: tunnel boring machine hard-rock cutting free face disc cutter rock-cutting efficiency
Yidan WANG, Renke KANG, Yan QIN, Qian MENG, Zhigang DONG
《机械工程前沿(英文)》 2021年 第16卷 第2期 页码 285-297 doi: 10.1007/s11465-021-0631-9
关键词: Nomex honeycomb core disc cutter inclined ultrasonic cutting machining quality
Performance of landfill leachate treatment system with disc-tube reverse osmosis units
WANG Baozhen, LIU Shuo, LIU Yanping, LI Xiujin
《环境科学与工程前沿(英文)》 2008年 第2卷 第1期 页码 24-31 doi: 10.1007/s11783-008-0024-x
A. F. D’ Intino,B. de Caprariis,M.L. Santarelli,N. Verdone,A. Chianese
《化学科学与工程前沿(英文)》 2014年 第8卷 第2期 页码 156-160 doi: 10.1007/s11705-014-1427-9
Xudong YU MM, Zengwu SHAO MD, Liming XIONG MD, Weiwei XU MM, Hezhong WANG MM, Huifa XU MM,
《医学前沿(英文)》 2009年 第3卷 第4期 页码 415-420 doi: 10.1007/s11684-009-0072-z
关键词: tissue inhibitor of metalloproteinase-3 intervertebral disc rabbit gene therapy
Methods and applications of DEA cross-efficiency: Review and future perspectives
Jie WU, Jiasen SUN, Liang LIANG
《工程管理前沿(英文)》 2021年 第8卷 第2期 页码 199-211 doi: 10.1007/s42524-020-0133-1
关键词: cross-efficiency evaluation efficiency secondary goal model aggregation review
null
《医学前沿(英文)》 2015年 第9卷 第1期 页码 100-107 doi: 10.1007/s11684-014-0372-9
This study aims to explore the prevalence and determinations of physical inactivity among hospital employees in Shanghai, China. A cross-sectional study of 4612 employees aged 19 to 68 years was conducted through stratified cluster sampling from different classes of Shanghai hospitals in 2011. The total physical activity was evaluated using the metabolic equivalent according to the Global Physical Activity Questionnaire. Among the participants, 38.5%, 32.3%, and 64.6% of the employees are inactive at work, commuting, and taking leisure time, respectively. Up to 41.8% of the men and 37.8% of the women (P = 0.012) are physically inactive. When the age and educational level are adjusted, male doctors and medical technicians show a higher percentage of physical inactivity than male workers in logistics (P = 0.001). Among females, employees who are working in second- and third-class hospitals show a higher proportion of physical inactivity than those who are working in community health care centers. Logistic regression analyses show that the odds ratios (ORs) of leisure-time physical inactivity associated with the intensity of physical activity at work are 2.259, 2.897, and 4.266 for men (P<0.001) and 2.456, 3.259, and 3.587 for women (P<0.001), respectively. The time during commuting activities is significantly associated with leisure-time physical inactivity in either sex (OR= 2.116 for men and 2.173 for women, P<0.001). Hospital employees, particularly doctors and medical technicians, show a higher proportion of physical inactivity than other inhabitants in Shanghai. The time and intensity of activity at work and commuting are associated with leisure-time activities.
关键词: prevalence determination employee public hospital cross-sectional study physical inactivity
周武,林明森,李延民,王振占,黄磊
《中国工程科学》 2013年 第15卷 第7期 页码 75-80
本文研究了海洋二号(HY-2A)扫描微波辐射计冷空定标方法和数据反演算法。针对HY-2A扫描微波辐射计对地观测和定标扫描的设计原理和观测几何,基于微波辐射计的对地观测数据修正进入冷空反射器的地球信号,建立地面观测亮温的冷空反射器权重系数矩阵修正冷空观测信号;基于海面温度、海面风速、水汽含量和云液态含量的微波辐射计辐射传输模型,计算HY-2A扫描微波辐射计不同条件下的各频率极化方式下的理论亮温,建立线性回归模型,拟合不同地球物理参数的反演系数,采用多元线性回归算法反演HY-2A微波扫描辐射计地球物理参数,对比国外成熟微波辐射计数据,得到产品精度。
River Chief System (RCS): An experiment on cross-sectoral coordination of watershed governance
Longfei Wang, Jiaxin Tong, Yi Li
《环境科学与工程前沿(英文)》 2019年 第13卷 第4期 doi: 10.1007/s11783-019-1157-9
The trans-regional characteristics of watershed governance produce more problems beyond the capacity of each individual water-related department, leading to the fragmentation of watershed management. The River Chief System (RCS) has experienced swift developments over the past decade in China by appointing the local government heads as river chiefs. RCS works efficiently in the short-term due to its superiority in the inclusion of clear responsibility, authority, and multi-sectoral collaboration. However, the characteristics of the authority-based vertical coordination of the hierarchical system remain unchanged, and therefore the problems of organizational logic and the responsibility dilemma still exist. Tasks including perfecting of laws, integrated watershed management, and public participation still need to be completed. RCS reflects the routine and characteristics of the migration of national governance, and as such provides new insights for other developing countries in the design of river management systems.
关键词: River Chief System Watershed governance Cross-sectoral coordination Environmental protection
Air bearing center cross gap of neutron stress spectrometer sample table support system
Yang LI,Yunxin WU,Hai GONG,Xiaolei FENG
《机械工程前沿(英文)》 2016年 第11卷 第4期 页码 403-411 doi: 10.1007/s11465-016-0405-y
A support system is the main load-bearing component of sample table for neutron stress spectrometer, and air bearing is an important element of a support system. The neutron stress spectrometer sample table was introduced, and the scheme for air bearing combination was selected. To study the performance of air bearing center cross gap, finite element models (FEMs) were established based on air motion and Reynolds equations, effects of air supply pressure, and gap parameters on the overturning moment and bearing capacity of air bearing center cross gap were analyzed. Results indicate that the width, depth, and height differences of the marble floor gap played important roles in the performance of the air bearing. When gap width is lesser than 1 mm and gap depth is lower than 0.4 mm, bearing capacity and overturning moment would vary rapidly with the variation of the width and depth. A gap height difference results in the bearing capacity dropping rapidly. The FEM results agree well with experimental results. Further, findings of the study could guide the design of the support system and marble floor.
关键词: neutron stress spectrometer sample table support system air bearing center cross gap simulation experiment
标题 作者 时间 类型 操作
Combined static mixers for high viscous fluids mixing
Zhenhao XI, Weizhen SUN, Ling ZHAO, Zhaoyan LIU
期刊论文
RESPONSE OF WHEAT COMPOSITE CROSS POPULATIONS TO DISEASE AND CLIMATE VARIATION OVER 13 GENERATIONS
期刊论文
Vibration analysis of blade-disc coupled structure of compressor
WANG Chunjie, SONG Shunguang, ZONG Xiao
期刊论文
Wear mechanism of disc-brake block material for new type of drilling rig
WANG Xinhua, WANG Simin, ZHANG Siwei, WANG Deguo
期刊论文
Analysis of load and adaptability of disc cutters during shield tunneling in soft–hard varied strata
期刊论文
Field and laboratory experimental studies on hard-rock tunnel excavation based on disc cutter coupled
期刊论文
Effects of inclination angles of disc cutter on machining quality of Nomex honeycomb core in ultrasonic
Yidan WANG, Renke KANG, Yan QIN, Qian MENG, Zhigang DONG
期刊论文
Performance of landfill leachate treatment system with disc-tube reverse osmosis units
WANG Baozhen, LIU Shuo, LIU Yanping, LI Xiujin
期刊论文
Best operating conditions to produce hydroxyapatite nanoparticles by means of a spinning disc reactor
A. F. D’ Intino,B. de Caprariis,M.L. Santarelli,N. Verdone,A. Chianese
期刊论文
Adenovirus-mediated tissue inhibitor of metalloproteinase-3 gene transfection inhibits rabbit intervertebral disc
Xudong YU MM, Zengwu SHAO MD, Liming XIONG MD, Weiwei XU MM, Hezhong WANG MM, Huifa XU MM,
期刊论文
Methods and applications of DEA cross-efficiency: Review and future perspectives
Jie WU, Jiasen SUN, Liang LIANG
期刊论文
Prevalence and determinations of physical inactivity among public hospital employees in Shanghai, China: a cross-sectional
null
期刊论文
River Chief System (RCS): An experiment on cross-sectoral coordination of watershed governance
Longfei Wang, Jiaxin Tong, Yi Li
期刊论文