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Deviation correction strategy for the earth pressure balance shield based on shield–soil interactions

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 2, doi: 10.1007/s11465-022-0676-4

Abstract: The additional position change during the shield attitude correction is highlighted.

Keywords： additional position change     deviation correction trajectory     earth pressure balance shield     mechanical    

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Experimental and CFD analysis of nozzle position of subsonic ejector

Xilai ZHANG, Shiping JIN, Suyi HUANG, Guoqing TIAN

Frontiers in Energy 2009, Volume 3, Issue 2,   Pages 167-174 doi: 10.1007/s11708-009-0001-5

Abstract: The influence of nozzle position on the performance of an ejector was analyzed qualitatively with freeExperimental investigations and computational fluid dynamics (CFD) analysis of the nozzle position ofThe results show that there is an optimum nozzle position for the ejector.Moreover, the nozzle position of an ejector is not a fixed value, but is influenced greatly by the flow

Keywords： ejector     nozzle position     ejecting coefficient     CFD    

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Robust energy-efficient train speed profile optimization in a scenario-based position–time–speed network

Frontiers of Engineering Management 2021, Volume 8, Issue 4,   Pages 595-614 doi: 10.1007/s42524-021-0173-1

Abstract: Specifically, we first construct a scenario-based position–time–speed (PTS) network by considering resistance

Keywords： robust train speed profile     percentile reliability model     scenario-based position–time–speed network    

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Strategic position and development prospects of nuclear energy in China

SHEN Wenquan

Frontiers in Energy 2007, Volume 1, Issue 2,   Pages 125-128 doi: 10.1007/s11708-007-0015-9

Abstract: By analyzing the challenges of China s energy supply, an excellent perspective of nuclear power development in the country has been described. Taking into account the near-, mid-, and long-term development requirements, a comprehensive, coordinated and sustainable nuclear power program is proposed. Thus, our national nuclear industry can not only catch up with the world s advanced level in proper time, but also possess enough stamina for sustainability.

Keywords： development     excellent perspective     long-term development     comprehensive     national    

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Air-bearing position optimization based on dynamic characteristics of ultra-precision linear stages

CHEN Xuedong, LI Zhixin

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 4,   Pages 400-407 doi: 10.1007/s11465-008-0060-z

Abstract: characteristics including mode frequency, mode shape, and response amplitude are obviously changed with the positionThe combined optimization method is used to optimize the air-bearings position.The method can be generalized to the connection position of different components in manufacture elementsand to implement the system dynamic characteristics optimization when the connection position can be

Keywords： manufacture     different     interaction     air-bearings     response amplitude    

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Task-space position/attitude tracking control of FAST fine tuning system

QI Lin, ZHANG Hui, DUAN Guanghong

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 4,   Pages 392-399 doi: 10.1007/s11465-008-0056-8

Abstract: This paper addresses the task-space position/attitude tracking control of a suspended parallel robot,the quaternion algebra, a novel model-independent task-space PD controller that ensures end-effector position

Keywords： telescope     five-hundred     end-effector     controller     simulation    

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Climate change and China’s mega urban regions

Chaolin GU, Sunsheng HAN

Frontiers of Structural and Civil Engineering 2010, Volume 4, Issue 4,   Pages 418-430 doi: 10.1007/s11709-010-0075-5

Abstract: China’s mega urban regions are focal points of economic development and environmental concerns. This paper positions four mega urban regions (i.e., the Yangtze River Delta, the Pearl River Delta, the Bohai Bay Area, and the South-eastern Fujian Province) along China’s coast into the national economy and elaborates their development challenges and planning innovations. Mega urban regions in China are spatial consequences of rapid economic transition. They deserve close scrutiny and demands for innovative planning responses in order to maintain their key role in driving economic growth but limiting their greenhouse gas emission.

Keywords： climate change     mega urban region     urban planning    

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Resource evaluation，position and distribution of tight sandstone gas in China

Zhang Guosheng ,Deng Songtao

Strategic Study of CAE 2012, Volume 14, Issue 6,   Pages 87-93

Abstract:

Based on the reservoir forming condition research of tight sandstone gas in Ordos Basin, Sichuan Basin and Tarim Basin, the authors give two types of tight sandstone gas reservoirs,sloped lithologic type and structural type which are the main of tight sandstone gas reservoir. The favorable gas region is predicted with multi-factor overlay method. And based on the existed tight sandstone gas reservoir analysis, the authors get the main parameters such as reservoir abundance, gas-bearing area coefficient which are necessary for gas resource calculation of the large basin through analogism method. According to the result of this resource evaluation, the tight sandstone gas geological recoverable resource in China is 9.2×1012～13.4×1012 m3 which is widely distributed over coal measure basins. The tight sandstone gas is the most realistic source in present. Due to the support of government policies and the motivation of technological progress, it might become one of the pillar sources in natural gas development in 10 to 20 years.

Keywords： tight sandstone gas     distribution feature     resource potential     development position    

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Tackling climate change and promoting the energy revolution

Xiangwan DU

Frontiers in Energy 2018, Volume 12, Issue 3,   Pages 338-343 doi: 10.1007/s11708-018-0535-5

Abstract: China’s international responsibility to combat climate change is consistent with the inherent sustainable

Keywords： climate change     Paris Agreement     low-carbon transition     energy revolution    

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Large Scale Infrastructure Projects: The Art of Project or Change Management?

Geert Letens,Kurt Verweire,Peter De Prins

Frontiers of Engineering Management 2016, Volume 3, Issue 3,   Pages 197-202 doi: 10.15302/J-FEM-2016033

Abstract: Although it is generally understood that change is a fundamental component of managing projects in theFor this purpose, this work looks at change through the eyes of a framework of six batteries of changethat seem essential to charge an organization’s capabilities for change.Assessing the six batteries of change in this context can help organizations to develop capabilitiesfor change that build change energy by balancing formal/rational methods with informal/emotional interventions

Keywords： large scale project management     organization development and change     batteries of change model    

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Initial position estimation strategy for a surface permanent magnet synchronous motor used in hybrid Article

Bing TIAN,Qun-tao AN,Li SUN,Dong-yang SUN,Jian-dong DUAN

Frontiers of Information Technology & Electronic Engineering 2016, Volume 17, Issue 8,   Pages 803-813 doi: 10.1631/FITEE.1500298

Abstract: model for surface permanent magnet synchronous motors (SPMSMs) is adopted to estimate the initial rotor positionUsually, the accuracy of initial rotor position estimation for SPMSMs relies on magnetic saturation.identified with the aid of the saturation evaluation function, based on which an estimation of the positionprocedure, a special demodulation is suggested to extract signals of iron core saturation and rotor position

Keywords： Surface permanent magnet synchronous motor (SPMSM)     Initial position estimation     Nonlinear model     Hybridinjection     Position observer    

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Planet position errors in planetary transmission: Effect on load sharing and transmission error

Miguel IGLESIAS, Alfonso FERNáNDEZ, Ana DE-JUAN, Ramón SANCIBRIáN, Pablo GARCíA

Frontiers of Mechanical Engineering 2013, Volume 8, Issue 1,   Pages 80-87 doi: 10.1007/s11465-013-0362-7

Abstract: gear transmissions developed by the authors is used to study the influence of carrier planet pin hole positionThe influence of carrier planet pin hole position errors on the planet load sharing is studied, and severalTangential and radial planet pin hole position errors are considered independently, and the effect of

Keywords： gear     planetary     epicyclic     transmission     load sharing     transmission error    

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Prospects and Strategic Position on Unconventional Natural Gas Development & Utilization in China

The Project Team of “China Unconventional Natural Gas Development & Utilization Strategic Research

Strategic Study of CAE 2015, Volume 17, Issue 9,   Pages 6-10

Abstract:

The unconventional natural gas resources is abundant in China but with low degree of development and utilization. Moreover, there is advanced technology and experiences from outside China can be learned. It is of great strategic significance to accelerate the development and utilization of unconventional natural gas resources for economic and social development as well as the energy security. Based on the evaluation of the potential and exploitation trends of four types of unconventional natural gas resources, some strategies and measures were recommended in this paper. The studies suggested that the grand total technically recoverable resources of shale gas, tight gas and coal-bed methane in China is approximately 3.1×1013 m3, which is 1.5 times that of conventional natural gas resources. Both technological innovation and policy support from the government are the key to achieve the large-scale development and utilization of unconventional natural gas resources. A three-step strategy can be applied in the development and utilization of unconventional natural gas in China. The output of unconventional natural gas is predicted to draw equal with that of the conventional natural gas around 2020; it is expected to reach approximately 3×1011 m3 around 2030, accounting for 2/3 of the national total. It will be the main contributor for the sustainable and sound development of China’s natural gas industry.

Keywords： unconventional natural gas     resource potential     development and utilization     strategic position    

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SEQUESTERING ORGANIC CARBON IN SOILS THROUGH LAND USE CHANGE AND AGRICULTURAL PRACTICES: A REVIEW

Frontiers of Agricultural Science and Engineering 2023, Volume 10, Issue 2,   Pages 210-225 doi: 10.15302/J-FASE-2022474

Abstract:

● Either increasing C input to or reducing C release from soils can enhance soil C sequestration.

Keywords： agroecosystems     climate change     negative emissions technology     net zero    

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Assessment of future climate change impacts on water-heat-salt migration in unsaturated frozen soil using

Hanli Wan, Jianmin Bian, Han Zhang, Yihan Li

Frontiers of Environmental Science & Engineering 2021, Volume 15, Issue 1, doi: 10.1007/s11783-020-1302-5

Abstract: . • Freeze–thaw cycles and future climate change can exacerbate salinization.mechanisms of water, heat, and salt in unsaturated frozen soil, as well as its response to future climate changerepresentative concentration pathway (RCP) scenarios were simulated to analyze the effects of future climate changeClimate change will shorten the freeze–thaw period, advance the soil melting time from April to Marchmeasures should be taken to prevent the salinization of unsaturated frozen soils and address climate change

Keywords： Soil salinization     Climate change     Unsaturated frozen soil     Water-heat-salt balance     Soil environment change    

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Title Author Date Type Operation

Deviation correction strategy for the earth pressure balance shield based on shield–soil interactions

Journal Article

Experimental and CFD analysis of nozzle position of subsonic ejector

Xilai ZHANG, Shiping JIN, Suyi HUANG, Guoqing TIAN

Journal Article

Robust energy-efficient train speed profile optimization in a scenario-based position–time–speed network

Journal Article

Strategic position and development prospects of nuclear energy in China

SHEN Wenquan

Journal Article

Air-bearing position optimization based on dynamic characteristics of ultra-precision linear stages

CHEN Xuedong, LI Zhixin

Journal Article

Task-space position/attitude tracking control of FAST fine tuning system

QI Lin, ZHANG Hui, DUAN Guanghong

Journal Article

Climate change and China’s mega urban regions

Chaolin GU, Sunsheng HAN

Journal Article

Resource evaluation，position and distribution of tight sandstone gas in China

Zhang Guosheng ,Deng Songtao

Journal Article

Tackling climate change and promoting the energy revolution

Xiangwan DU

Journal Article

Large Scale Infrastructure Projects: The Art of Project or Change Management?

Geert Letens,Kurt Verweire,Peter De Prins

Journal Article

Initial position estimation strategy for a surface permanent magnet synchronous motor used in hybrid

Bing TIAN,Qun-tao AN,Li SUN,Dong-yang SUN,Jian-dong DUAN

Journal Article

Planet position errors in planetary transmission: Effect on load sharing and transmission error

Miguel IGLESIAS, Alfonso FERNáNDEZ, Ana DE-JUAN, Ramón SANCIBRIáN, Pablo GARCíA

Journal Article

Prospects and Strategic Position on Unconventional Natural Gas Development & Utilization in China

The Project Team of “China Unconventional Natural Gas Development & Utilization Strategic Research

Journal Article

SEQUESTERING ORGANIC CARBON IN SOILS THROUGH LAND USE CHANGE AND AGRICULTURAL PRACTICES: A REVIEW

Journal Article

Assessment of future climate change impacts on water-heat-salt migration in unsaturated frozen soil using

Hanli Wan, Jianmin Bian, Han Zhang, Yihan Li

Journal Article