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methane/air mixtures with multiple orifices in a large bore constant volume chamber: effect of air-fuel equivalenceratio and pre-mixed pressure

Xiang LI, Wenzheng ZHANG, Zhong HUANG, Dehao JU, Li HUANG, Mingzhi FENG, Xingcai LU, Zhen HUANG

Frontiers in Energy 2019, Volume 13, Issue 3,   Pages 483-493 doi: 10.1007/s11708-019-0631-1

Abstract: To investigate the effect of air-fuel equivalence ratio and pre-mixed pressure on pre-chamber TJI ofDifferent initial pressures and air-fuel equivalence ratios were considered to analyze the characteristics

Keywords： marine engine     natural gas     methane     turbulent jet ignition (TJI)     pre-chamber    

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Experimental evaluation of a 35 kVA downdraft gasifier

Ashok Jayawant Rao KECHE, Gaddale AMBA PRASAD RAO

Frontiers in Energy 2013, Volume 7, Issue 3,   Pages 300-306 doi: 10.1007/s11708-013-0247-9

Abstract: The optimum value of equivalence ratio was observed to be 0.3134 for achieving the maximum gas conversion

Keywords： biomass     gasification     producer gas     equivalence ratio     total particulate matter     conversion efficiency of    

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The calculation of equivalence factor for ecological footprints in China: a methodological note

Moucheng LIU,Wenhua LI,Dan ZAHNG,Ning SU

Frontiers of Environmental Science & Engineering 2015, Volume 9, Issue 6,   Pages 1015-1024 doi: 10.1007/s11783-014-0670-0

Abstract: Thus, this article calculates equivalence factors on the national and provincial levels in China basedbuilt-up land has an equivalence factor of 1.71, forest and fossil energy land has a factor of 1.41,pasture has a factor of 0.44 and water/fishery 0.35; Finally, the equivalence factor of 6 land areaThe NPP of each ecosystem type varies along with the equivalence factor in different provinces.However, the ranking of the equivalence factors in different provinces remain the same, with that of

Keywords： ecological footprint     equivalence factor     net primary production     biological capacity     land types    

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Laminar-to-Turbulence Transition Revealed Through a Reynolds Number Equivalence Article

Xiao Dong Chen

Engineering 2019, Volume 5, Issue 3,   Pages 576-579 doi: 10.1016/j.eng.2018.09.013

Abstract: In this work, a local Reynolds number equivalence γ (ratio

Keywords： Local Reynolds number equivalence     Flow transition from laminar to turbulent mode     Universal law of the    

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Hydraulic Pressure Extremes Ratio & Extremes Ratio Efficiencies

Qi Maolin

Strategic Study of CAE 2001, Volume 3, Issue 4,   Pages 73-75

Abstract: applies basic formula to the calculation of a relationship between the hydraulic pressure extremes ratioof hydraulic system and the extremes ratio efficiencies.This relationship shows that the greater the hydraulic pressure extremes ratio is, the lower the extremesratio efficiencies are.The article holds that the hydraulic pressure extremes ratio can be designed and chosen.

Keywords： hydraulic pressure extremes ratio     extremes ratio efficiencies     hydraulic system    

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Controlling interstory drift ratio profiles via topology optimization strategies

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 2,   Pages 165-178 doi: 10.1007/s11709-022-0892-3

Abstract: proposed approach involves solving a min–max optimization problem to suppress the maximum interstory drift ratioThe proposed methodology can shape the interstory drift ratio profiles into inverted triangular or quadratic

Keywords： interstory drift ratio     aggregation function     bound formulation     min–max problem     topology optimization    

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Fast emergency control strategy calculation based on dynamic equivalence and integral sensitivity Research Articles

Yi-fan GAO, Jian-quan WANG, Tan-nan XIAO, Dao-zhuo JIANG

Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 8,   Pages 1119-1132 doi: 10.1631/FITEE.1700389

Abstract: real-time emergency control, a fast transient stability simulation algorithm based on real-time dynamic equivalence

Keywords： Emergency control     Transient stability     Numerical integration     Dynamic equivalence     Integral sensitivity    

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Numerical analysis and experimental investigation of modal properties for the gearbox in wind turbine

Pengxing YI,Peng HUANG,Tielin SHI

Frontiers of Mechanical Engineering 2016, Volume 11, Issue 4,   Pages 388-402 doi: 10.1007/s11465-016-0404-z

Abstract:

Wind turbine gearbox (WTG), which functions as an accelerator, ensures the performance and service life of wind turbine systems. This paper examines the distinctive modal properties of WTGs through finite element (FE) and experimental modal analyses. The study is performed in two parts. First, a whole system model is developed to investigate the first 10 modal frequencies and mode shapes of WTG using flexible multi-body modeling techniques. Given the complex structure and operating conditions of WTG, this study applies spring elements to the model and quantifies how the bearings and gear pair interactions affect the dynamic characteristics of WTGs. Second, the FE modal results are validated through experimental modal analyses of a 1.5 WM WTG using the frequency response function method of single point excitation and multi-point response. The natural frequencies from the FE and experimental modal analyses show favorable agreement and reveal that the characteristic frequency of the studied gearbox avoids its eigen-frequency very well.

Keywords： wind turbine gearbox     modal analysis     finite element analysis     modal frequency     bearing equivalence    

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A methodology of implementing target mixing ratio for asphalt mixture

Yucheng HUANG, Lun JI, Rui WEN, Ming ZHANG

Frontiers of Structural and Civil Engineering 2017, Volume 11, Issue 3,   Pages 308-314 doi: 10.1007/s11709-017-0405-y

Abstract: of hot mix asphalt adequately during the construction process, the significance of objective mixing ratioThe results show that the set of methods can not only implement the objective mixing ratio of hot mix

Keywords： asphalt mixture     target mixing ratio     mix design implementation     batching & mixing plant debugging    

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Diagnostic evaluation of plasma aldosterone concentration to plasma renin activity ratio in primary aldosteronism

ZHANG Huilan, WANG Daowen

Frontiers of Medicine 2008, Volume 2, Issue 1,   Pages 11-14 doi: 10.1007/s11684-008-0003-4

Abstract: Using the plasma aldosterone concentration to plasma renin activity ratio (PAC/PRA ratio) as the screeninghypertensive patients, we studied the clinical characteristics and the diagnostic value of PAC/PRA ratioOne hundred and twenty-six suspected primary aldosteronism patients whose PAC/PRA ratio was > 25 ng/dLThe PAC/PRA ratio can be considered as a routine screening test in hypertensives, especially resistanthypertensive patients and a high PAC/PRA ratio is an invaluable index in primary aldosteronism diagnosis
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Enhancing the efficiency of nitrogen removing bacterial population to a wide range of C:N ratio (1.5:

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 8, doi: 10.1007/s11783-022-1522-y

Abstract:

• Simultaneous C & N removal in Methammox occurs at wide C:N ratio.

Keywords： Methanogens     Biological Nitrogen Removal (BNR)     Simultaneous     Methammox     C:N ratio    

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Experimental study of structural damage identification based on modal parameters and decay ratio of acceleration

Zhigen WU, Guohua LIU, Zihua ZHANG

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 1,   Pages 112-120 doi: 10.1007/s11709-010-0069-3

Abstract: A novel damage assessment method based on the decay ratio of acceleration signals (DRAS) was proposed

Keywords： damage assessment     decay ratio of acceleration signals (DRAS)     wavelet transform (WT)     modal analysis     reinforced    

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The influence of the NCO/OH ratio and the 1,6-hexanediol/dimethylol propionic acid molar ratio on the

Jiao Feng, Qiuhao Lu, Weimin Tan, Kequan Chen, Pingkai Ouyang

Frontiers of Chemical Science and Engineering 2019, Volume 13, Issue 1,   Pages 80-89 doi: 10.1007/s11705-018-1763-2

Abstract: indicate that the degree of hydrogen bonding and the numbers of urea groups increase as the NCO/OH ratioand HDO/DMPA molar ratio increase.Furthermore, the phase separation increases and the thermal stability decreases as the NCO/OH ratio increasesor the HDO/DMPA molar ratio decreases.

Keywords： 1     5-pentamethylene diisocyanate     polyurethane     water based    

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Long term performance of recycled concrete beams with different water–cement ratio and recycled aggregate

Jingwei YING; Feiming SU; Shuangren CHEN

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 3,   Pages 302-315 doi: 10.1007/s11709-022-0803-7

Abstract: service performance of recycled aggregate concrete (RAC) components for different values of water−cement ratiorequirements when changing the replacement rate of RCA, it is necessary to change the water−cement ratiodeformation properties of reinforced concrete beams were tested respectively by changing water−cement ratioreduced more effectively by adjusting the replacement rate of RCA than by adjusting the water−cement ratioThe water−cement ratio has an evident influence on the axial compressive strength and early creep of

Keywords： recycled concrete     beam     the replacement rate of recycled coarse aggregate     water–cement ratio     digital    

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Influence of nozzle height to width ratio on ignition and NO

Liutao SUN, Yonghong YAN, Rui SUN, Zhengkang PENG, Chunli XING, Jiangquan WU

Frontiers in Energy 2021, Volume 15, Issue 2,   Pages 431-448 doi: 10.1007/s11708-021-0726-3

Abstract: The combustion tests indicate that the flame stability, ignition performance, and fuel burnout ratioFurthermore, the ratio (denoted by / ) of the strong reduction zone area to the combustion reaction

Keywords： rectangular jet burner     nozzle height to width ratio     ignition characteristics     pyrolyzed semicoke (SC)    

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Title Author Date Type Operation

methane/air mixtures with multiple orifices in a large bore constant volume chamber: effect of air-fuel equivalenceratio and pre-mixed pressure

Xiang LI, Wenzheng ZHANG, Zhong HUANG, Dehao JU, Li HUANG, Mingzhi FENG, Xingcai LU, Zhen HUANG

Journal Article

Experimental evaluation of a 35 kVA downdraft gasifier

Ashok Jayawant Rao KECHE, Gaddale AMBA PRASAD RAO

Journal Article

The calculation of equivalence factor for ecological footprints in China: a methodological note

Moucheng LIU,Wenhua LI,Dan ZAHNG,Ning SU

Journal Article

Laminar-to-Turbulence Transition Revealed Through a Reynolds Number Equivalence

Xiao Dong Chen

Journal Article

Hydraulic Pressure Extremes Ratio & Extremes Ratio Efficiencies

Qi Maolin

Journal Article

Controlling interstory drift ratio profiles via topology optimization strategies

Journal Article

Fast emergency control strategy calculation based on dynamic equivalence and integral sensitivity

Yi-fan GAO, Jian-quan WANG, Tan-nan XIAO, Dao-zhuo JIANG

Journal Article

Numerical analysis and experimental investigation of modal properties for the gearbox in wind turbine

Pengxing YI,Peng HUANG,Tielin SHI

Journal Article

A methodology of implementing target mixing ratio for asphalt mixture

Yucheng HUANG, Lun JI, Rui WEN, Ming ZHANG

Journal Article

Diagnostic evaluation of plasma aldosterone concentration to plasma renin activity ratio in primary aldosteronism

ZHANG Huilan, WANG Daowen

Journal Article

Enhancing the efficiency of nitrogen removing bacterial population to a wide range of C:N ratio (1.5:

Journal Article

Experimental study of structural damage identification based on modal parameters and decay ratio of acceleration

Zhigen WU, Guohua LIU, Zihua ZHANG

Journal Article

The influence of the NCO/OH ratio and the 1,6-hexanediol/dimethylol propionic acid molar ratio on the

Jiao Feng, Qiuhao Lu, Weimin Tan, Kequan Chen, Pingkai Ouyang

Journal Article

Long term performance of recycled concrete beams with different water–cement ratio and recycled aggregate

Jingwei YING; Feiming SU; Shuangren CHEN

Journal Article

Influence of nozzle height to width ratio on ignition and NO

Liutao SUN, Yonghong YAN, Rui SUN, Zhengkang PENG, Chunli XING, Jiangquan WU

Journal Article