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An experimental study on plunging depth of density currents
Hassan GOLEIJ, Amir Hamzeh HAGHIABI, Abbas PARSAIE
《结构与土木工程前沿(英文)》 2017年 第11卷 第4期 页码 388-395 doi: 10.1007/s11709-017-0417-7
关键词: dense current plunge point Densimetric Froude Number dam reservoirs
STRENGTHENING NON-POINT SOURCE POLLUTION CONTROL TO PROMOTE AGRICULTURAL GREEN DEVELOPMENT
《农业科学与工程前沿(英文)》 2023年 第10卷 第4期 页码 503-509 doi: 10.15302/J-FASE-2023528
STRENGTHENING NON-POINT SOURCE POLLUTION CONTROL TO PROMOTE AGRICULTURAL GREEN DEVELOPMENT
关键词: GREEN AGRICULTURAL PROMOTE POLLUTION SOURCE DEVELOPMENT POINT STRENGTHENING CONTROL
M. NAZEMIZADEH, H. N. RAHIMI, K. AMINI KHOIY
《机械工程前沿(英文)》 2012年 第7卷 第1期 页码 23-28 doi: 10.1007/s11465-012-0304-9
This paper presents an optimal control strategy for optimal trajectory planning of mobile robots by considering nonlinear dynamic model and nonholonomic constraints of the system. The nonholonomic constraints of the system are introduced by a nonintegrable set of differential equations which represent kinematic restriction on the motion. The Lagrange’s principle is employed to derive the nonlinear equations of the system. Then, the optimal path planning of the mobile robot is formulated as an optimal control problem. To set up the problem, the nonlinear equations of the system are assumed as constraints, and a minimum energy objective function is defined. To solve the problem, an indirect solution of the optimal control method is employed, and conditions of the optimality derived as a set of coupled nonlinear differential equations. The optimality equations are solved numerically, and various simulations are performed for a nonholonomic mobile robot to illustrate effectiveness of the proposed method.
关键词: mobile robot trajectory planning nonlinear dynamic optimal control
《机械工程前沿(英文)》 2022年 第17卷 第3期 doi: 10.1007/s11465-022-0686-2
关键词: autonomous excavation unmanned electric shovel point cloud excavation trajectory planning
Room temperature liquid metal: its melting point, dominating mechanism and applications
Junheng FU, Chenglin ZHANG, Tianying LIU, Jing LIU
《能源前沿(英文)》 2020年 第14卷 第1期 页码 81-104 doi: 10.1007/s11708-019-0653-8
关键词: melting point liquid metal crystal thermodynamics molecular dynamics
《农业科学与工程前沿(英文)》 2023年 第10卷 第4期 页码 607-626 doi: 10.15302/J-FASE-2023517
As the common features of agroecosystems, ditches and ponds benefit the irrigation and drainage, as well as intercepting non-point source pollutants. However, most ditch-pond studies have been conducted in lowland areas. To test this source-sink assumption in upland areas, this study made observations on the ecological function of the ditch and pond system in a typical catchment in China. First, the changes in ponds in the catchment were analyzed using high-resolution remote sensing data. Then, the migration of agricultural pollutants in ditches and ponds were analyzed by field sampling and laboratory detection. The results showed that over the past 15 years the length of ditches in the catchment and the number of small ponds (< 500 m2) have increased by 32% and 75%, respectively. The rate of change in nutrient concentrations in the ditches and ponds were mostly from −20% to 20%, indicating ditches and ponds can be both sources and sinks for agricultural pollutants. Lastly, the contributing factors were explored and it was found that ditches and ponds are important sinks in dry season. However, during the rainy season, ditches and ponds become sources of pollutants, with the rapid drainage of ditches and the overflow of ponds in upland areas. The results of this study revealed that the ditches and ponds could be used for ecological engineering in upland catchments to balance drainage and intercept pollutants.
关键词: ditches ponds non-point source pollution mountainous areas nitrogen phosphorus
Chu-hua HUANG,Dong-ming LU,Chang-yu DIAO
《信息与电子工程前沿(英文)》 2016年 第17卷 第5期 页码 422-434 doi: 10.1631/FITEE.1500316
关键词: Multi-view video Free-viewpoint video Point-pair Multiscale-contour-based interpolation Spatio-temporal-contour Consistency Time-varying point cloud sequence
Haiyan Yang, Shangping Xu, Derek E. Chitwood, Yin Wang
《环境科学与工程前沿(英文)》 2020年 第14卷 第5期 doi: 10.1007/s11783-020-1254-9
关键词: Point-of-use water treatment Ceramic water filter Bacterial removal Surface modification Water quality
Artificial bee colony optimization for economic dispatch with valve point effect
Yacine LABBI,Djilani Ben ATTOUS,Belkacem MAHDAD
《能源前沿(英文)》 2014年 第8卷 第4期 页码 449-458 doi: 10.1007/s11708-014-0316-8
关键词: artificial bee colony (ABC) algorithm economic dispatch (ED) valve-point effect optimization
Removal of non-point pollutants from bridge runoff by a hydrocyclone using natural water head
Jianghua YU, Yeonseok KIM, Youngchul KIM
《环境科学与工程前沿(英文)》 2013年 第7卷 第6期 页码 886-895 doi: 10.1007/s11783-012-0449-0
关键词: first flush hydrocyclone non-point pollution removal efficiency stormwater runoff
FULL TIME-SPACE GOVERNANCE STRATEGY AND TECHNOLOGY FOR CROPLAND NON-POINT POLLUTION CONTROL IN CHINA
《农业科学与工程前沿(英文)》 2023年 第10卷 第4期 页码 593-606 doi: 10.15302/J-FASE-2023522
Ensuring food safety while reducing agricultural non-point source pollution is quite challenging, especially in developing and underdeveloped countries. Effective systematic strategies and comprehensive technologies need to be developed for agricultural non-point source pollution control at the watershed scale to improve surface water quality. In this review, a proposal is made for a full time-space governance strategy that prioritizes source management followed by endpoint water pollution control. The 4R chain technology system is specifically reviewed, including source reduction, process retention, nutrient reuse and water restoration. The 4R chain technology system with the full time-space governance strategy was applied at the scale of an administrative village and proved to be a feasible solution for reducing agricultural non-point source pollution in China. In the future, a monitoring system needs to be established to trace N and P transport. Additionally, new smart fertilizer and intelligent equipment need to be developed, and relevant governance standards and supportive policies need to be set to enhance the efficacy of agricultural non-point source pollution control.
关键词: 4R chain technology system agricultural non-point source pollution case study full time-space governance strategy
Phase change effect of low melting point metal for an automatic cooling of USB flash memory
Haoshan GE, Jing LIU
《能源前沿(英文)》 2012年 第6卷 第3期 页码 207-209 doi: 10.1007/s11708-012-0204-z
C. RENNO, A. PERONE
《能源前沿(英文)》 2021年 第15卷 第2期 页码 384-395 doi: 10.1007/s11708-020-0717-9
关键词: CPV system point-focus experimental model energy and economic analysis
HUANG Jinliang, HONG Huasheng, ZHANG Luoping
《环境科学与工程前沿(英文)》 2008年 第2卷 第3期 页码 333-339 doi: 10.1007/s11783-008-0035-7
标题 作者 时间 类型 操作
An experimental study on plunging depth of density currents
Hassan GOLEIJ, Amir Hamzeh HAGHIABI, Abbas PARSAIE
期刊论文
Trajectory planning of mobile robots using indirect solution of optimal control method in generalized point-to-point
M. NAZEMIZADEH, H. N. RAHIMI, K. AMINI KHOIY
期刊论文
Toward autonomous mining: design and development of an unmanned electric shovel via point cloud-based
期刊论文
Room temperature liquid metal: its melting point, dominating mechanism and applications
Junheng FU, Chenglin ZHANG, Tianying LIU, Jing LIU
期刊论文
DITCHES AND PONDS CAN BE THE SOURCES OR SINKS OF NON-POINT SOURCE POLLUTION: OBSERVATIONS IN AN UPLAND
期刊论文
A multiscale-contour-based interpolation framework for generating a time-varying quasi-dense point cloud
Chu-hua HUANG,Dong-ming LU,Chang-yu DIAO
期刊论文
Ceramic water filter for point-of-use water treatment in developing countries: Principles, challenges
Haiyan Yang, Shangping Xu, Derek E. Chitwood, Yin Wang
期刊论文
Artificial bee colony optimization for economic dispatch with valve point effect
Yacine LABBI,Djilani Ben ATTOUS,Belkacem MAHDAD
期刊论文
Removal of non-point pollutants from bridge runoff by a hydrocyclone using natural water head
Jianghua YU, Yeonseok KIM, Youngchul KIM
期刊论文
FULL TIME-SPACE GOVERNANCE STRATEGY AND TECHNOLOGY FOR CROPLAND NON-POINT POLLUTION CONTROL IN CHINA
期刊论文
Phase change effect of low melting point metal for an automatic cooling of USB flash memory
Haoshan GE, Jing LIU
期刊论文
Energy and economic analysis of a point-focus concentrating photovoltaic system when its installation
C. RENNO, A. PERONE
期刊论文