Resource Type

Journal Article 223

Year

2024 1

2023 13

2022 10

2021 16

2020 18

2019 17

2018 11

2017 15

2016 15

2015 8

2014 8

2013 8

2012 5

2011 6

2010 6

2009 13

2008 9

2007 11

2006 8

2005 4

open ︾

Keywords

nonlinear 16

China 4

nonlinear analysis 4

nonlinear vibration 3

AGM 2

Algebraic Method (AGM) 2

Event-triggered control 2

Nonlinear system 2

bearing capacity 2

control 2

decoupling control 2

robustness 2

stability 2

1D seismic site response analysis 1

2-radical expansion 1

2014 Ludian earthquake 1

2016 Kumamoto earthquake 1

2022 Winter Olympics 1

21st-Century Maritime Silk Road 1

open ︾

Search scope:

排序： Display mode:

Highlights of special issue on ‘Agriculture in Water-Limited Areas’

Pute WU

Frontiers of Agricultural Science and Engineering 2017, Volume 4, Issue 2,   Pages 123-125 doi: 10.15302/J-FASE-2017147

HTML PDF Collect

A data envelopment analysis of agricultural technical efficiency of Northwest Arid Areas in China

Yubao WANG, Lijie SHI, Haojie ZHANG, Shikun SUN

Frontiers of Agricultural Science and Engineering 2017, Volume 4, Issue 2,   Pages 195-207 doi: 10.15302/J-FASE-2017153

Abstract: Severe resource shortage and waste of resource in agricultural production make it necessary to assess efficiency to increase productivity with high efficiency and ensure sustainable agricultural development. This paper adopted an input-oriented data envelopment analysis (DEA) method with the assumption of variable returns to scale to evaluate agricultural production efficiency of 100 major irrigation districts in Northwest China in 2010. Major findings of this paper were as follows: firstly, the average value of total technical efficiency, pure technical efficiency and scale efficiency of those irrigation districts in Northwest China were 0.770, 0.825 and 0.931, respectively; secondly, 30% of irrigation districts were technically efficient, while 42% and 32% of them showed pure technical and scale efficiency respectively. Among inefficient decision-making units, total technical efficiency score varied from 0.313 to 0.966, showing significant geographical differences, but geographical differences of pure technical efficiency was more consistent with that of total technical efficiency; thirdly, input redundancy was evident. Inputs of agricultural population, irrigation area, green water, blue water, consumption of fertilizer and agricultural machinery could be reduced by 34.88%, 40.19%, 43.85%, 47.10%, 41.53% and 42.21% respectively without reducing agricultural outputs. Furthermore, irrigation area, green water and blue water had relatively high slack movement though Northwest China which is short of water resources. Based on these results, this paper drew the following conclusions: First, there is huge potential for Northwest China to improve its agricultural production efficiency, and agro-technology not input scale had greater influence on improvement. Second, farmers needed proper guidance in order to reduce agricultural inputs and it is time to centralize agricultural management for overall agricultural inputs regulation and control.

Keywords： agricultural production efficiency     DEA model     input redundancy     irrigation districts     Northwest Arid Areas    

HTML PDF Collect

Local and regional contributions to PM in the Beijing 2022 Winter Olympics infrastructure areas during

Frontiers of Environmental Science & Engineering 2021, Volume 15, Issue 6, doi: 10.1007/s11783-021-1434-2

Abstract:

• Regional transportation contributed more than local emissions during haze episodes.

Keywords： 2022 Winter Olympics     PM2.5     Source apportionment    

HTML PDF Collect

New nonlinear stiffness actuator with predefined torque‒deflection profile

Frontiers of Mechanical Engineering 2023, Volume 18, Issue 1, doi: 10.1007/s11465-022-0721-3

Abstract: A nonlinear stiffness actuator (NSA) could achieve high torque/force resolution in low stiffness range

Keywords： compliant actuator     nonlinear stiffness actuator     nonlinear spring     predefined torque−deflection profile    

HTML PDF Collect

Development and Challenges of Antarctic Marine Protected Areas

Fu Yu

Strategic Study of CAE 2019, Volume 21, Issue 6,   Pages 9-17 doi: 10.15302/J-SSCAE-2019.06.002

Abstract:

The Antarctic marine protected areas (MPAs) have developed rapidly in

Keywords： Antarctic marine protected areas     Antarctic ocean governance and conservation     scientific data    

HTML PDF Collect

Assessment of metals in dry-toilet collected matters from suburban areas of Ulaanbaatar, Mongolia, using

Xuan LIU,Zifu LI,Eric BOSC,Heinz-Peter MANG

Frontiers of Environmental Science & Engineering 2014, Volume 8, Issue 5,   Pages 710-718 doi: 10.1007/s11783-013-0592-2

Abstract: matter (DCM) from traditional dry-toilet pits are a potential health and ecological risk in suburban areasIn this study, the characteristics of metals in DCMs from suburban areas of Ulaanbaatar were surveyed

Keywords： heavy metals     suburban areas     dry-toilet     risk assessment    

HTML PDF Collect

Integrated river basin management in rapidly urbanizing areas: a case of Shenzhen, China

Lei LIU, Xiaoming MA

Frontiers of Environmental Science & Engineering 2011, Volume 5, Issue 2,   Pages 243-254 doi: 10.1007/s11783-010-0276-0

Abstract: The rapid urbanization of China is causing a burden on their water resources and hindering their sustainable development. This paper analyzes effective methods to integrated river basin management (IRBM) using Longgang River basin of Shenzhen as an example, which is the city with the fastest rate of urbanization in China and even the whole world. Over the past 20 years, China has undergone a population boom due to the increase of immigrant workers and rapid development of labor-intensive industries, which led to the sharp increase of water consumption and sewage discharge. However, the construction of the water infrastructure is still lagging far behind the environmental and social development, with only 32.7% of sewage in the district being treated. Currently, every water quality indicator of the Longgang River basin was unable to meet the required corresponding environmental standards, which further aggravated the water shortages of the region. Thus, an analytical framework is proposed to address the IRBM of the study area. The problems with the current management system include the lack of decentralization in decision-making, lack of enforcement with redundant plans, weak management capacity, financial inadequacy, and a poor system of stakeholder participation. In light of the principles of IRBM and the situation of the region, corresponding measures are put forward, including an increase of power given to sub-district offices, fewer but more feasible plans, capacity building among stakeholders, a combination of planning and marketing for overcoming financial inadequacy, and profound reform in the public participation system. The framework and institutional suggestions could inform similar processes in other representative river basins.

Keywords： integrated river basin management (IRBM) model     Longgang River basin     Shenzhen     decentralization     stakeholder participation    

HTML PDF Collect

The Exploration and Practice of the Development of Green Eco-Urban Areas in Guangzhou International Financial

Jia-meng Chen,Peng Liu

Frontiers of Engineering Management 2016, Volume 3, Issue 1,   Pages 87-96 doi: 10.15302/J-FEM-2016003

Abstract: Active exploration has been carried out to determine a pattern for developing green eco-urban areas inresearch, development of green technologies at home and abroad, and indicator systems of green urban areas

Keywords： Guangzhou International Financial City     green eco-urban area     indicator system     case verification    

HTML PDF Collect

Mean wind load induced incompatibility in nonlinear aeroelastic simulations of bridge spans

Zhitian ZHANG

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 3,   Pages 605-617 doi: 10.1007/s11709-018-0499-x

Abstract: Mean wind response induced incompatibility and nonlinearity in bridge aerodynamics is discussed, where the mean wind and aeroelastic loads are applied simultaneously in time domain. A kind of incompatibility is found during the simultaneous simulation of the mean wind and aeroelastic loads, which leads to incorrect mean wind structural responses. It is found that the mathematic expectations (or limiting characteristics) of the aeroelastic models are fundamental to this kind of incompatibility. In this paper, two aeroelastic models are presented and discussed, one of indicial-function-denoted (IF-denoted) and another of rational-function-denoted (RF-denoted). It is shown that, in cases of low wind speeds, the IF-denoted model reflects correctly the mean wind load properties, and results in correct mean structural responses; in contrast, the RF-denoted model leads to incorrect mean responses due to its nonphysical mean properties. At very high wind speeds, however, even the IF-denoted model can lead to significant deviation from the correct response due to steady aerodynamic nonlinearity. To solve the incompatibility at high wind speeds, a methodology of subtraction of pseudo-steady effects from the aeroelastic model is put forward in this work. Finally, with the method presented, aeroelastic nonlinearity resulted from the mean wind response is investigated at both moderate and high wind speeds.

Keywords： bridge     aerodynamics     nonlinear     aeroelastic model     Pseudo-steady     mean wind loads    

HTML PDF Collect

General expression for linear and nonlinear time series models

Ren HUANG, Feiyun XU, Ruwen CHEN

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 1,   Pages 15-24 doi: 10.1007/s11465-009-0015-z

Abstract: However, some nonlinear factors are within the practical system; thus, it is difficult to fit the modelThis paper proposes a general expression for linear and nonlinear auto-regressive time series modelsexperiments show that the GNAR model can accurately approximate to the dynamic characteristics of the most nonlinear

Keywords： linear and nonlinear     autoregressive model     system identification     time series analysis    

HTML PDF Collect

Evaluation of transmissibility for a class of nonlinear passive vibration isolators

Z. K. PENG, Z. Q. LANG, G. MENG

Frontiers of Mechanical Engineering 2012, Volume 7, Issue 4,   Pages 401-409 doi: 10.1007/s11465-012-0349-9

Abstract: concept of Output Frequency Response Functions (OFRFs) is applied to represent the transmissibility of nonlinearcharacteristic parameters is derived for a wide class of nonlinear isolators that have nonlinear anti-symmetricdamping characteristics and a comprehensive pattern about how the nonlinear damping characteristic parametersThese conclusions are of significant importance in the analysis and design of the nonlinear vibrationisolators with nonlinear anti-symmetric damping.

Keywords： nonlinear vibration     volterra series     Output Frequency Response Functions (OFRFs)     nonlinear damping     vibration    

HTML PDF Collect

Model-free adaptive control for three-degree-of-freedom hybrid magnetic bearings Article

Ye YUAN, Yu-kun SUN, Qian-wen XIANG, Yong-hong HUANG, Zhi-ying ZHU

Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 12,   Pages 2035-2045 doi: 10.1631/FITEE.1700324

Abstract: auxiliary bearings with different inner diameters, and two kinds of operation situations (linear and nonlinearareas) are present to analyze the validity of MFAC in detail.

Keywords： Model-free adaptive control     Hybrid magnetic bearings     Nonlinear areas     Faster response     Higher stability    

HTML PDF Collect

FOR USE IN AGROECOSYSTEM IMPROVEMENT IN SEMI-ARID AREAS WITH A FOCUS ON CENTRAL ANATOLIA, TURKEY

Frontiers of Agricultural Science and Engineering 2021, Volume 8, Issue 4,   Pages 568-582 doi: 10.15302/J-FASE -2019270

Abstract: Increasing arboreal vegetation in these areas through agroforestry is an important strategy to conserveCasuarina have been evaluated for their potential use in agroecosystem improvement in semi-arid areas

Keywords： actinorrhizal trees / agroforestry / climate change / ecosystem restoration    

HTML PDF Collect

Numerical analysis of nonlinear dynamic behavior of earth dams

Babak EBRAHIMIAN

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 1,   Pages 24-40 doi: 10.1007/s11709-010-0082-6

Abstract: The numerical investigation employs a fully nonlinear dynamic finite difference analysis incorporating

Keywords： earth dam     numerical     nonlinear response     dynamic analysis     earthquake     dam height    

HTML PDF Collect

government investment for air pollution control in city clusters: A case from the Beijing–Tianjin–Hebei areas

Frontiers of Engineering Management   Pages 612-624 doi: 10.1007/s42524-023-0269-x

Abstract: Air pollution poses a significant threat to human health, particularly in urban areas with high levelsSpecifically, we focused on the Beijing–Tianjin–Hebei areas as a case study, as the investment primarilytargeted industrial activities in urban areas with the goal of improving living conditions for urban

Keywords： investment efficiency     government investment     air pollution control     three-stage DEA-Malmquist model    

HTML PDF Collect

Title Author Date Type Operation

Highlights of special issue on ‘Agriculture in Water-Limited Areas’

Pute WU

Journal Article

A data envelopment analysis of agricultural technical efficiency of Northwest Arid Areas in China

Yubao WANG, Lijie SHI, Haojie ZHANG, Shikun SUN

Journal Article

Local and regional contributions to PM in the Beijing 2022 Winter Olympics infrastructure areas during

Journal Article

New nonlinear stiffness actuator with predefined torque‒deflection profile

Journal Article

Development and Challenges of Antarctic Marine Protected Areas

Fu Yu

Journal Article

Assessment of metals in dry-toilet collected matters from suburban areas of Ulaanbaatar, Mongolia, using

Xuan LIU,Zifu LI,Eric BOSC,Heinz-Peter MANG

Journal Article

Integrated river basin management in rapidly urbanizing areas: a case of Shenzhen, China

Lei LIU, Xiaoming MA

Journal Article

The Exploration and Practice of the Development of Green Eco-Urban Areas in Guangzhou International Financial

Jia-meng Chen,Peng Liu

Journal Article

Mean wind load induced incompatibility in nonlinear aeroelastic simulations of bridge spans

Zhitian ZHANG

Journal Article

General expression for linear and nonlinear time series models

Ren HUANG, Feiyun XU, Ruwen CHEN

Journal Article

Evaluation of transmissibility for a class of nonlinear passive vibration isolators

Z. K. PENG, Z. Q. LANG, G. MENG

Journal Article

Model-free adaptive control for three-degree-of-freedom hybrid magnetic bearings

Ye YUAN, Yu-kun SUN, Qian-wen XIANG, Yong-hong HUANG, Zhi-ying ZHU

Journal Article

FOR USE IN AGROECOSYSTEM IMPROVEMENT IN SEMI-ARID AREAS WITH A FOCUS ON CENTRAL ANATOLIA, TURKEY

Journal Article

Numerical analysis of nonlinear dynamic behavior of earth dams

Babak EBRAHIMIAN

Journal Article

government investment for air pollution control in city clusters: A case from the Beijing–Tianjin–Hebei areas

Journal Article