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Xiang LI, Wenzheng ZHANG, Zhong HUANG, Dehao JU, Li HUANG, Mingzhi FENG, Xingcai LU, Zhen HUANG
《能源前沿(英文)》 2019年 第13卷 第3期 页码 483-493 doi: 10.1007/s11708-019-0631-1
关键词: marine engine natural gas methane turbulent jet ignition (TJI) pre-chamber
Experimental evaluation of a 35 kVA downdraft gasifier
Ashok Jayawant Rao KECHE, Gaddale AMBA PRASAD RAO
《能源前沿(英文)》 2013年 第7卷 第3期 页码 300-306 doi: 10.1007/s11708-013-0247-9
关键词: biomass gasification producer gas equivalence ratio total particulate matter conversion efficiency of gasifier
The calculation of equivalence factor for ecological footprints in China: a methodological note
Moucheng LIU,Wenhua LI,Dan ZAHNG,Ning SU
《环境科学与工程前沿(英文)》 2015年 第9卷 第6期 页码 1015-1024 doi: 10.1007/s11783-014-0670-0
关键词: ecological footprint equivalence factor net primary production biological capacity land types
通过一个等价雷诺数揭示层流到湍流的转捩区域 Article
陈晓东
《工程(英文)》 2019年 第5卷 第3期 页码 576-579 doi: 10.1016/j.eng.2018.09.013
Flow transition from laminar to turbulent mode (and vice versa)—that is, the initiation of turbulence—is one of the most important research subjects in the history of engineering. Even for pipe flow, predicting the onset of turbulence requires sophisticated instrumentation and/or direct numerical simulation, based on observing the instantaneous flow structure formation and evolution. In this work, a local Reynolds number equivalence γ (ratio of local inertia effect to viscous effect) is seen to conform to the Universal Law of the Wall, where γ = 1 represents a quantitative balance between the abovementioned two effects. This coincides with the wall layer thickness (y+ = 1, where y+ is the dimensionless distance from the wall surface defined in the Universal Law of the Wall). It is found that the characteristic of how the local derivative of γ against the local velocity changes with increasing velocity determines the onset of turbulence. For pipe flow, γ ≈ 25, and for plate flow, γ ≈ 151.5. These findings suggest that a certain combination of γ and velocity (nonlinearity) can qualify the source of turbulence (i.e., generate turbulent energy). Similarly, a re-evaluation of the previous findings reveals that only the geometrically narrow domain can act locally as the source of turbulence, with the rest of the flow field largely being left for transporting and dissipating. This understanding will have an impact on the future large-scale modeling of turbulence.
齐茂林
《中国工程科学》 2001年 第3卷 第4期 页码 73-75
文章应用基础公式,推导液压系统油压极值比与极值比效率之间的关系式。该式说明,油压极值比越大,极值比效率就越低。提出了油压极值比是可以设计和选择的。
Controlling interstory drift ratio profiles via topology optimization strategies
《结构与土木工程前沿(英文)》 2023年 第17卷 第2期 页码 165-178 doi: 10.1007/s11709-022-0892-3
关键词: interstory drift ratio aggregation function bound formulation min–max problem topology optimization
基于动态等值及数值积分灵敏度的快速紧急控制策略计算 Research Articles
Yi-fan GAO, Jian-quan WANG, Tan-nan XIAO, Dao-zhuo JIANG
《信息与电子工程前沿(英文)》 2019年 第20卷 第8期 页码 1119-1132 doi: 10.1631/FITEE.1700389
Pengxing YI,Peng HUANG,Tielin SHI
《机械工程前沿(英文)》 2016年 第11卷 第4期 页码 388-402 doi: 10.1007/s11465-016-0404-z
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.
关键词: wind turbine gearbox modal analysis finite element analysis modal frequency bearing equivalence
A methodology of implementing target mixing ratio for asphalt mixture
Yucheng HUANG, Lun JI, Rui WEN, Ming ZHANG
《结构与土木工程前沿(英文)》 2017年 第11卷 第3期 页码 308-314 doi: 10.1007/s11709-017-0405-y
关键词: asphalt mixture target mixing ratio mix design implementation batching & mixing plant debugging
ZHANG Huilan, WANG Daowen
《医学前沿(英文)》 2008年 第2卷 第1期 页码 11-14 doi: 10.1007/s11684-008-0003-4
《环境科学与工程前沿(英文)》 2022年 第16卷 第8期 doi: 10.1007/s11783-022-1522-y
• Simultaneous C & N removal in Methammox occurs at wide C:N ratio.
关键词: Methanogens Biological Nitrogen Removal (BNR) Simultaneous Methammox C:N ratio
Zhigen WU, Guohua LIU, Zihua ZHANG
《结构与土木工程前沿(英文)》 2011年 第5卷 第1期 页码 112-120 doi: 10.1007/s11709-010-0069-3
关键词: damage assessment decay ratio of acceleration signals (DRAS) wavelet transform (WT) modal analysis reinforced concrete beam beat phenomenon
Jiao Feng, Qiuhao Lu, Weimin Tan, Kequan Chen, Pingkai Ouyang
《化学科学与工程前沿(英文)》 2019年 第13卷 第1期 页码 80-89 doi: 10.1007/s11705-018-1763-2
1,5-Pentamethylene diisocyanate, a novel aliphatic diisocyanate formed from bio-based 1,5-pentamethylenediamine, has been used as a hard segmented material to synthesize polyurethane. In this study, several waterborne polyurethane (WPU) dispersions have been successfully prepared by a prepolymer process from 1,5-pentamethylene diisocyanate poly(polyether) with different NCO/OH ratios and 1,6-hexanediol (HDO)/dimethylol propionic acid (DMPA) molar ratios. The Fourier transform infrared (FTIR) spectra, thermogravimetric analysis, differential scanning calorimetry, X-ray diffraction, and a mechanical tensile test were used to investigate the structures, thermal stability, phase separation, crystallinity, mechanical properties, and adhesive performance of the WPU dispersions. The FTIR results indicate that the degree of hydrogen bonding and the numbers of urea groups increase as the NCO/OH ratio and HDO/DMPA molar ratio increase. Furthermore, the phase separation increases and the thermal stability decreases as the NCO/OH ratio increases or the HDO/DMPA molar ratio decreases. Finally, WPU3.0-2.4 (NCO/OH=3, HDO/DMPA=2.4) exhibits a maximum tensile strength and shear strength, pointing to its possible use as an adhesive. These results could provide a very valuable reference for industrial applications of WPU.
关键词: 1 5-pentamethylene diisocyanate polyurethane water based
Jingwei YING; Feiming SU; Shuangren CHEN
《结构与土木工程前沿(英文)》 2022年 第16卷 第3期 页码 302-315 doi: 10.1007/s11709-022-0803-7
关键词: recycled concrete beam the replacement rate of recycled coarse aggregate water–cement ratio digital image correlation
Influence of nozzle height to width ratio on ignition and NO
Liutao SUN, Yonghong YAN, Rui SUN, Zhengkang PENG, Chunli XING, Jiangquan WU
《能源前沿(英文)》 2021年 第15卷 第2期 页码 431-448 doi: 10.1007/s11708-021-0726-3
关键词: rectangular jet burner nozzle height to width ratio ignition characteristics pyrolyzed semicoke (SC) and bituminous blend NOx formation
标题 作者 时间 类型 操作
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
期刊论文
Experimental evaluation of a 35 kVA downdraft gasifier
Ashok Jayawant Rao KECHE, Gaddale AMBA PRASAD RAO
期刊论文
The calculation of equivalence factor for ecological footprints in China: a methodological note
Moucheng LIU,Wenhua LI,Dan ZAHNG,Ning SU
期刊论文
Numerical analysis and experimental investigation of modal properties for the gearbox in wind turbine
Pengxing YI,Peng HUANG,Tielin SHI
期刊论文
A methodology of implementing target mixing ratio for asphalt mixture
Yucheng HUANG, Lun JI, Rui WEN, Ming ZHANG
期刊论文
Diagnostic evaluation of plasma aldosterone concentration to plasma renin activity ratio in primary aldosteronism
ZHANG Huilan, WANG Daowen
期刊论文
Enhancing the efficiency of nitrogen removing bacterial population to a wide range of C:N ratio (1.5:
期刊论文
Experimental study of structural damage identification based on modal parameters and decay ratio of acceleration
Zhigen WU, Guohua LIU, Zihua ZHANG
期刊论文
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
期刊论文
Long term performance of recycled concrete beams with different water–cement ratio and recycled aggregate
Jingwei YING; Feiming SU; Shuangren CHEN
期刊论文