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Impact of introducing a herb pasture area into a New Zealand sheep and beef hill country farm system:

Cécile DURANTON, Cory MATTHEW

Frontiers of Agricultural Science and Engineering 2018, Volume 5, Issue 1,   Pages 87-97 doi: 10.15302/J-FASE-2018202

Abstract: These farm systems are continually evolving for increased efficiency, in part through the use of metabolicenergy modeling tools by farmers and farm consultants to explore alternative farm system configurationssystem, and to analyze the impact of the introduction of an area of plantain.Herbage production, animal performance and financial results for a base farm scenario created from theThe system configuration of the base farm stockpiles surplus autumn feed for release to animals in winter

Keywords： farm system configuration     herb pasture     metabolic energy budgeting     plantain     sheep and beef farming    

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Framework design of a hybrid energy system by combining wind farm with small gas turbine power plants

Nengsheng BAO, Weidou NI,

Frontiers in Energy 2010, Volume 4, Issue 2,   Pages 205-210 doi: 10.1007/s11708-009-0073-2

Abstract: a negative impact on power grid when a large-scale wind farm is connected to a power grid.It is very difficult to overcome this impact only by wind farm itself.A novel power system called wind-gas turbine hybrid energy system was discussed, and the framework designThe hybrid energy system combines wind farm with several small gas turbine power plants to form an integratedfor the output fluctuation from the wind farm for the firm output from the whole power system.

Keywords： framework design     hybrid energy system     wind farm     gas turbine power plants    

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Evaluation and Recombination of Property Right Configuration for Urban Water Supply System

Xiao Wen,Ouyang Fangrui,Wang Xianjia

Strategic Study of CAE 2004, Volume 6, Issue 7,   Pages 48-52

Abstract:

In this paper, two basic models of recombination of property right configuration for urban water supplysystem are proposed.The evaluation index and methodology of property right configuration for urban water supply system aredeveloped using the theory of system economics and management science.The characteristics of the two property right configuration models and actions of different benefit bodies

Keywords： urban water supply system     property right configuration     recombination of property right     evaluation of    

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NEW ZEALAND DAIRY FARM SYSTEMS AND KEY ENVIRONMENTAL EFFECTS

Frontiers of Agricultural Science and Engineering 2021, Volume 8, Issue 1,

Abstract:

• NZ dairy farming systems are based on year-round grazing of perennial pasture (ryegrass/white clover).

• Milk production per hectare has increased by about 29% with increased use of externally-sourced feeds over the last two decades.

• Externally-sourced feeds with a low protein concentration can potentially reduce N2O emissions and N leaching per unit of production.

• Systems analysis is important for evaluating mitigations to minimize trade-offs between environmental impacts.

 

This paper provides an overview of the range of dairy pasture grazing systems used in New Zealand (NZ), the changes with increased inputs over time and associated key environmental effects including nitrogen (N) leaching and greenhouse gas (GHG) emissions. NZ dairy farming systems are based on year-round grazing and seasonal milk production on perennial ryegrass/clover pasture where cows are rotationally grazed in paddocks. There was an increase in stocking rate on NZ dairy farms from 2.62 cows ha−1 in 2000/2001 to 2.84 cows ha−1 in 2015/2016. During the same period annual milk solids production increased from 315 to 378 kg·yr−1 per cow. This performance has coincided with an increase in N fertilizer use (by ~ 30%) and a twofold increase in externally-sourced feeds. Externally-sourced feeds with a low protein concentration (e.g., maize silage) can increase the efficiency of N utilization and potentially reduce N losses per unit of production. Off-paddock facilities (such as standoff or feed pads) are often used to restrict grazing during very wet winter conditions. A systems analysis of contrasting dairy farms in Waikato (largest NZ dairying region) indicates that the increased input would result in an increase in per-cow milk production but little change in efficiency of milk production from a total land use perspective. This analysis also shows that the increased inputs caused an 11% decrease in N footprint (i.e., N emissions per unit of milk production) and a 2% increase in C footprint (i.e., greenhouse gas (GHG) emissions per unit of milk production).jiafa.luo@agresearch.co.nz

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NEW ZEALAND DAIRY FARM SYSTEMS AND KEY ENVIRONMENTAL EFFECTS

Jiafa LUO, Stewart LEDGARD

Frontiers of Agricultural Science and Engineering 2021, Volume 8, Issue 1,   Pages 148-158 doi: 10.15302/J-FASE-2020372

Abstract: This paper provides an overview of the range of dairy pasture grazing systems used in New Zealand (NZ), the changes with increased inputs over time and associated key environmental effects including nitrogen (N) leaching and greenhouse gas (GHG) emissions. NZ dairy farming systems are based on year-round grazing and seasonal milk production on perennial ryegrass/clover pasture where cows are rotationally grazed in paddocks. There was an increase in stocking rate on NZ dairy farms from 2.62 cows ha in 2000/2001 to 2.85 cows ha in 2015/2016. During the same period annual milk solids production increased from 315 to 378 kg·yr per cow. This performance has coincided with an increase in N fertilizer use (by 30%) and a twofold increase in externally-sourced feeds. Externally-sourced feeds with a low protein concentration (e.g., maize silage) can increase the efficiency of N utilization and potentially reduce N losses per unit of production. Off-paddock facilities (such as standoff or feed pads) are often used to restrict grazing during very wet winter conditions. A systems analysis of contrasting dairy farms in Waikato (largest NZ dairying region) indicates that the increased input would result in an increase in per-cow milk production but little change in efficiency of milk production from a total land use perspective. This analysis also shows that the increased inputs caused an 11% decrease in N footprint (i.e., N emissions per unit of milk production) and a 2% increase in C footprint (i.e., greenhouse gas (GHG) emissions per unit of milk production).

Keywords： dairy farms     environmental impacts     grazing systems     intensification     mitigation    

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considerations for redesigning sustainable cropping systems: the value of data-mining large and detailed farmdata sets at the cropping system level

Nicolas MUNIER-JOLAIN, Martin LECHENET

Frontiers of Agricultural Science and Engineering 2020, Volume 7, Issue 1,   Pages 21-27 doi: 10.15302/J-FASE-2019292

Abstract: such methods to analyze the crop management strategies affecting pesticide use and their effect on farminvestment in the development of large data sets that can support future research programs on farming system

Keywords： data mining     holistic     Integrated Pest Management     economics     DEPHY network.    

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Effects of green roof damping and configuration on structural seismic response

Frontiers of Structural and Civil Engineering   Pages 1133-1144 doi: 10.1007/s11709-023-0959-9

Abstract: Sustainable structures are critical for addressing global climate change. Hence, their structural resilience or ability to recover from natural events must be considered comprehensively. Green roofs are a widely used sustainable feature that improve the environment while providing excellent occupant amenity. To expand their usage, their inherent damping and layout sensitivity to seismic performance are investigated in this study. The soil of a green roof can serve as a damper to dissipate the energy generated by earthquakes or other dynamic events. Results of preliminary analysis show that a green roof soil can increase localized damping by 2.5% under both dry and saturated conditions. Based on these findings, nonlinear time-history analyses are conducted on a three-story building in SAP2000 to monitor the structural behavior with and without a green roof. The increased damping in the green roof soil is beneficial to the structural performance, i.e., it reduces the building displacement and acceleration by 10% and 12%, respectively. Additionally, certain configurations are more effective and beneficial to the structural response than others, which suggests the possibility of design optimization. Based on the findings of this study, new methods of modeling and considering green roofs in structural design are established.

Keywords： green infrastructure     green roof     structural resilience     seismic design    

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Network-based optimization techniques for wind farm location decisions

Jorge Ignacio CISNEROS-SALDANA, Seyedmohammadhossein HOSSEINIAN, Sergiy BUTENKO

Frontiers of Engineering Management 2018, Volume 5, Issue 4,   Pages 533-540 doi: 10.15302/J-FEM-2018025

Abstract: High wind speeds are required to obtain the maximum possible power output of a wind farm.

Keywords： wind energy     wind farm location     network analysis     optimization     clique     s-plex    

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Energy storage resources management: Planning, operation, and business model

Frontiers of Engineering Management   Pages 373-391 doi: 10.1007/s42524-022-0194-4

Abstract: complex demand-side loads, how to maintain the stable, reliable, and efficient operation of the power systemOne of the feasible solutions is deploying the energy storage system (ESS) to integrate with the energysystem to stabilize it.However, considering the costs and the input/output characteristics of ESS, both the initial configurationFirst of all, in terms of planning and configuration, it is investigated from capacity planning, location

Keywords： energy storage system     energy storage resources management     planning configuration     operational management    

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Tianrun Xia County phase III 99.5 MW wind power engineering technology and green innovation

Xiaobo WANG

Frontiers of Engineering Management 2019, Volume 6, Issue 1,   Pages 131-137 doi: 10.1007/s42524-019-0012-9

Abstract:

Keywords： low carbon design     green standard system     environmental protection     sustainable development     Tianrun SijiaoTown wind farm    

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Effect of cutterhead configuration on tunnel face stability during shield machine maintenance outages

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 4,   Pages 522-532 doi: 10.1007/s11709-023-0930-9

Abstract: Owing to long-distance advancement or obstacles, shield tunneling machines are typically shut down for maintenance. Engineering safety during maintenance outages is determined by the stability of the tunnel face. Pressure maintenance openings are typically used under complicated hydrogeological conditions. The tunnel face is supported by a medium at the bottom of the excavation chamber and compressed air at the top. Owing to the high risk of face failure, the necessity of support pressure when cutterhead support is implemented and a method for determining the value of compressed air pressure using different support ratios must to be determined. In this study, a non-fully chamber supported rotational failure model considering cutterhead support is developed based on the upper-bound theorem of limit analysis. Numerical simulation is conducted to verify the accuracy of the proposed model. The results indicate that appropriately increasing the specific gravity of the supporting medium can reduce the risk of collapse. The required compressed air pressure increases significantly as the support ratio decreases. Disregarding the supporting effect of the cutterhead will result in a tunnel face with underestimated stability. To satisfy the requirement of chamber openings at atmospheric pressure, the stratum reinforcement strength and range at the shield end are provided based on different cutterhead aperture ratios.

Keywords： tunnel face stability     cutterhead configuration     aperture ratio     pressure gradient     support ratio    

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Optimizing the configuration of a clearwell by integrating pilot and full-scale tracer testing

LIU Wenjun, DU Zhipeng, JIN Junwei

Frontiers of Environmental Science & Engineering 2007, Volume 1, Issue 3,   Pages 270-275 doi: 10.1007/s11783-007-0045-x

Abstract: confirmed that the installation of baffles within clearwells is an efficient way to optimize their configuration
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Manufacturing system modeling and performance evaluation based on improved stochastic statechart

ZHANG Guojun, HE Jiabing, ZHU Haiping, CHEN Xuan

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 4,   Pages 453-458 doi: 10.1007/s11465-007-0078-7

Abstract: can streamline the modeling process, a stochastic statechart is improved by using the abstract sub-systemand general system chart to express the comparability and integrity of a stochastic statechart respectivelycan be obtained by using a continuous-time Markov chain, which is transformed from a manufacturing systemeffectively simplify the modeling and performance evaluation process and the results are useful to the configurationand optimization of a manufacturing system.

Keywords： performance evaluation     different     configuration     improved     continuous-time    

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The influence analysis of foundation scouring on dynamic characteristics of the tower supporting systemof offshore wind farm

Yan Genhua,Gu Hua,Lu Zhongmin,Lin Yifeng

Strategic Study of CAE 2011, Volume 13, Issue 1,   Pages 69-73

Abstract: the paper establishes 3D finite element numerical model to get dynamic characteristics of supporting system

Keywords： scour     offshore wind farm     supporting system     dynamic characteristics     3D finite element    

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Tracing the impact of stack configuration on interface resistances in reverse electrodialysis by in situ

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 4, doi: 10.1007/s11783-021-1480-9

Abstract:

• RED performance and stack resistance were studied by EIS and LSV.

Keywords： Reverse electrodialysis     Electrochemical impedance spectroscopy     Concentration polarization     Spacer shadow effect    

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Title Author Date Type Operation

Impact of introducing a herb pasture area into a New Zealand sheep and beef hill country farm system:

Cécile DURANTON, Cory MATTHEW

Journal Article

Framework design of a hybrid energy system by combining wind farm with small gas turbine power plants

Nengsheng BAO, Weidou NI,

Journal Article

Evaluation and Recombination of Property Right Configuration for Urban Water Supply System

Xiao Wen,Ouyang Fangrui,Wang Xianjia

Journal Article

NEW ZEALAND DAIRY FARM SYSTEMS AND KEY ENVIRONMENTAL EFFECTS

Journal Article

NEW ZEALAND DAIRY FARM SYSTEMS AND KEY ENVIRONMENTAL EFFECTS

Jiafa LUO, Stewart LEDGARD

Journal Article

considerations for redesigning sustainable cropping systems: the value of data-mining large and detailed farmdata sets at the cropping system level

Nicolas MUNIER-JOLAIN, Martin LECHENET

Journal Article

Effects of green roof damping and configuration on structural seismic response

Journal Article

Network-based optimization techniques for wind farm location decisions

Jorge Ignacio CISNEROS-SALDANA, Seyedmohammadhossein HOSSEINIAN, Sergiy BUTENKO

Journal Article

Energy storage resources management: Planning, operation, and business model

Journal Article

Tianrun Xia County phase III 99.5 MW wind power engineering technology and green innovation

Xiaobo WANG

Journal Article

Effect of cutterhead configuration on tunnel face stability during shield machine maintenance outages

Journal Article

Optimizing the configuration of a clearwell by integrating pilot and full-scale tracer testing

LIU Wenjun, DU Zhipeng, JIN Junwei

Journal Article

Manufacturing system modeling and performance evaluation based on improved stochastic statechart

ZHANG Guojun, HE Jiabing, ZHU Haiping, CHEN Xuan

Journal Article

The influence analysis of foundation scouring on dynamic characteristics of the tower supporting systemof offshore wind farm

Yan Genhua,Gu Hua,Lu Zhongmin,Lin Yifeng

Journal Article

Tracing the impact of stack configuration on interface resistances in reverse electrodialysis by in situ

Journal Article