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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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Design and characteristics of electric supercharger for diesel engine acceleration by additional rapid

YAO Chun-de, ZHOU Hong-xiu

Frontiers of Mechanical Engineering 2006, Volume 1, Issue 4, Pages 409-412 doi: 10.1007/s11465-006-0048-5

Abstract: The ES (electric supercharger) driven by a high-speed brushless motor was developed to solve the problem of smoke caused by the turbocharger s sluggish response during acceleration. Its rotation speed was from 6 000 r/min to 24 000 r/min, and the maximum flux was 0.1 kg/s. The structural design of the electric supercharger is novel, which makes it easier to set the lubricating installation and to assemble. The velocity distribution at the outlet of the electric supercharger is determined by hot-wire anemometry under various rotation speeds in steady state. Furthermore, the trends of the flux and charge rate with various speeds were analyzed. In addition, the transient response was detected from the motor setup to smooth running within 10 s, 15 s, 20 s and 25 s respectively, and the characteristic of the transient flux is under pilot study. Research results indicate that the electric supercharger can respond rapidly with the great flux, and it is independent of the operating conditions of a diesel engine. Therefore, it is a feasible way to reduce smoke emission and improve the acceleration performance.

Keywords： acceleration velocity distribution high-speed brushless turbocharger electric supercharger

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Unlocked disinfection by-product formation potential upon exposure of swimming pool water to additional

Alvyn P. Berg, Ting-An Fang, Hao L. Tang

Frontiers of Environmental Science & Engineering 2019, Volume 13, Issue 1, doi: 10.1007/s11783-019-1098-3

Abstract:

• Swimming pool water was studied for DBPs upon exposure to additionalitemcontent>

• Urine led to a massive formation of chloroform with additional

Keywords： Trihalomethanes Haloacetic acids Chloroform Residual chlorine Anthropogenic organics Swimming pool water

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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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The clinicopathologic features of intraductal papillary mucinous neoplasms of the pancreas

QIN Xinyu, LIU Fenglin

Frontiers of Medicine 2007, Volume 1, Issue 2, Pages 121-125 doi: 10.1007/s11684-007-0023-5

Abstract: The additional existence of large mural nodules increases the possibility of malignancy in all types.

Keywords： available additional existence necessitate intraductal papillary non-invasive

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Modified Bishop method for stability analysis of weakly sloped subgrade under centrifuge model test

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 3, Pages 727-741 doi: 10.1007/s11709-021-0730-z

Abstract: the weakly sloped subgrade was considered in the proposed method using the “influential force” and “additionalThe “additional force” reflected the weight effect of the embankment fill, whereas the “influential force

Keywords： weakly sloped subgrade stability analysis additional force influential force modified Bishop method

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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