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Analytical and numerical analysis on the torsional performance of elliptically deformed tunnels in the longitudinal direction

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Underground Space 2023年第5期12卷 183-201页

作者： Yingbin Liu shaoming Liao Mengbo Liu Lisheng Chen Zhiyi Li Department of Geotechnical Engineering Tongji UniversityShanghai 200092China Shanghai Urban Construction Municipal Engineering Co. LtdShanghai 200065China

Segmental lining structures constructed by shields/tunnel boring machines are often subjected to uneven longitudinal cross-section torsion as a result of eccentric external loads,which is extremely adverse to tunnel safety but has not received sufficient attention for a long *** figure out the torsional performance of segmental tunnels,it is essential to assess the longitudinal torsional stiffness and active-torsion-rejection capability of a segmented *** aim of the paper is to derive an analytical solution to the longitudinal torsional stiffness of a segmental tunnel with existing elliptical *** longitudinal torsional stiffness under different internal force combinations is deduced considering the longitudinal axial force and bending moment based on the equivalent continuous model and force balance *** validity of the analytical solution is verified by comparing it with finite element method ***,a parametric analysis,using the new analytical solution,is included to investigate the effect of the key parameters on torsional behaviors,including the segment size,the bolt size and the transverse bending stiffness,*** is found that:(1)the longitudinal torsional stiffness efficiency(LTSE)of the segmental tunnel decreases with the rise of segment thickness to diameter ratio but increases with the ring width to diameter ratio;(2)the LTSE reduces with the increase of the effective shear length but rises with the diameter of bolts;(3)the LTSE increases rapidly with the ratio of compression-torsion or ***,the envelope curve of the critical load(N0,M0)for a tunnel to actively resist a certain internal torque is *** proposed solution can be easily utilized to determine the longitudinal torsional stiffness of segmental tunnels and is an effective tool for tunnel design and maintenance.

关键词： Segmental tunnel Torsional deformation Longitudinal equivalent continuous model Longitudinal torsional stiffness Transverse bending stiffness

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Measurement and correlation of phase equilibrium data of the mixtures consisting of water, resorcinol, mesityl oxide at different temperatures

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Chinese Journal of Chemical Engineering 2018年第12期26卷 2573-2580页

作者： Youchang Wang shaoming Zhou Jinhui Tang Yun Chen Libo Li Key Laboratory of heat Transfer Enhancement and Energy Conservation of Ministry of Education School of Chemistry and Chemical Engineering South China University of Technology

Liquid–liquid equilibrium(LLE) data were measured for the ternary system of water + resorcinol + mesityl oxide under atmospheric pressure at temperatures of(298.2, 323.2, 333.2, 343.2 and 353.2) K. The reliability of the experimental data was verified by the Hand and Bachman equations. The distribution coefficient and selectivity were calculated from the experimental LLE data, which showed high efficiency of mesityl oxide extracting resorcinol from the aqueous solution. The NRTL and UNIQUAC models were employed to fit the measured experimental LLE data and yield corresponding binary interaction parameters.

关键词： Liquid-liquid equilibrium Mesityl oxide Resorcinol NRTL UNIQUAC

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Synergy methodology for multi-objective operational control of reservoirs in Yellow River basin

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Science China(Technological Sciences) 2004年第Z1期47卷 212-223页

作者： HUANG Qiang CHANG Jianxia WANG Yimin PENG shaoming Hydraulic and Hydrauelectric Institute Xi'an University of Technology Xi'an 710048 China Hydraulic and Hydrauelectric Institute Xi'an University of Technology Xi'an 710048 China Hydraulic and Hydrauelectric Institute Xi'an University of Technology Xi'an 710048 China Hydraulic and Hydrauelectric Institute Xi'an University of Technology Xi'an 710048 China

This paper presents an application of synergy methodology to a multi- objective operational control of reservoirs. This methodology enables a comprehensive consideration of multi-objectives which may be conflicting and non commensurate such as municipal and industrial water supply, flood protection, and hydroelectric power generation etc. On the basis of the synergy theory, a harmony degree model of sub- system was established to describe the coordination magnitude. Combined with information entropy, a harmony degree entropy was proposed to determine the water resources evolvement direction. While implementing the control, an initial scheme for reservoir operation was obtained from simulation first, then control was carried out according to the harmony degree and harmony degree entropy by applying synergy theory. The application of the methodology to reservoir system in the Yellow River was reported in this paper through a case study.

关键词： reservoir system, operational control, synergy theory, harmony degree, harmony degree entropy.

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Controlling the Diameter of Single-Walled Carbon Nanotubes by Improving the Dispersion of the Uniform Catalyst Nanoparticles on Substrate

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Nano-Micro Letters 2015年第4期7卷 353-359页

作者： Junjun Chen Xiangju Xu Lijie Zhang shaoming Huang Nanomaterials and Chemistry Key Laboratory Wenzhou University

To have uniform nanoparticles individually dispersed on substrate before single-walled carbon nanotubes(SWNTs)growth at high temperature is the key for controlling the diameter of the *** this letter,a facile approach to control the diameter and distribution of the SWNTs by improving the dispersion of the uniform Fe/Mo nanoparticles on silicon wafers with silica layer chemically modified by 1,1,1,3,3,3-hexamethyldisilazane under different conditions is *** is found that the dispersion of the catalyst nanoparticles on Si wafer surface can be improved greatly from hydrophilic to hydrophobic,and the diameter and distribution of the SWNTs depend strongly on the dispersion of the catalyst on the substrate *** dispersion of the catalyst results in relatively smaller diameter and narrower distribution of the SWNTs due to the decrease of aggregation and enhancement of dispersion of the catalyst nanoparticles before *** is also found that the diameter of the superlong aligned SWNTs is smaller with more narrow distribution than that of random nanotubes.

关键词： Single-walled carbon nanotube Diameter control Chemical modification Chemical vapor deposition Catalyst nanoparticles

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Factor graph aided multiple hypothesis tracking

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Science China(Information Sciences) 2013年第10期56卷 284-289页

作者： WANG Huan SUN JinPing LU SongTao WEI shaoming School of Electronic and Information Engineering Beihang University Department of Electrical and Computer Engineering Iowa State University

Since closely moving targets exist extensively in the ground moving target tracking,the uncertainty of data association greatly increases making the measurement-to-track association more ***,traditional multiple hypothesis tracking(MHT)has high false tracking rate and track *** paper frst investigates the measurement based factor graph in data association,and gives the corresponding message passing ***,a factor graph aided multiple hypothesis tracking(FGA-MHT)method is proposed,which introduces factor graph based m-best hypothesis producing technique and exploits factor graph based probability refnement algorithm to reduce the uncertainty of measurement-to-track *** results demonstrate that FGA-MHT reduces times of track swap and increases the correct data association rate in closely moving target tracking.

关键词： multiple hypothesis tracking(MHT) data association factor graph message passing algorithm sum-product algorithm factor graph aided multiple hypothesis tracking(FGA-MHT

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Time optimal quantum control of two-qubit systems

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Science China(Physics,Mechanics & Astronomy) 2013年第11期56卷 2116-2121页

作者： LI Bin YU ZuHuan FEI shaoming LI-JOST XianQing School of Mathematical Sciences Capital Normal University School of Mathematics and Statistics Northeast Normal University Max-Planck-Institute for Mathematics in the Sciences

We study the optimal quantum control of heteronuclear two-qubit systems described by a Hamiltonian containing both nonlocal internal drift and local control *** derive an explicit formula to compute the minimum time required to steer the system from an initial state to a specified final *** applications the minimal time to implement Controlled-NOT gate,SWAP gate and Controlled-U gate is calculated in *** experimental realizations of these quantum gates are explicitly presented.

关键词： time optimal quantum control heteronuclear two-spin system local invariants

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Computer comparisons in the presence of performance variation

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Frontiers of Computer Science 2020年第1期14卷 21-41页

作者： Samuel IRVING Bin LI shaoming CheN Lu PENG Weihua ZHANG Lide DUAN Louisiana State University Baton RougeLA 70803USA Shanghai Institute of Intelligent Electronics&Systems Shanghai 201203China Software School Fudan UniversityShanghai 201203China Shanghai Key Laboratory of Data Science Fudan UniversityShanghai 200433China University of Texas at San Antonio San AntonioTX 78249USA

Performance variability,stemming from nondeterministic hardware and software behaviors or deterministic behaviors such as measurement bias,is a well-known phenomenon of computer systems which increases the difficulty of comparing computer performance metrics and is slated to become even more of a concern as interest in Big Data analytic *** methods use various measures(such as geometric mean)to quantify the performance of different benchmarks to compare computers without considering this variability which may lead to wrong *** this paper,we propose three resampling methods for performance evaluation and comparison:a randomization test for a general performance comparison between two computers,bootstrapping confidence estimation,and an empirical distribution and five-number-summary for performance *** results show that for both PARSEC and highvariance BigDataBench benchmarks 1)the randomization test substantially improves our chance to identify the difference between performance comparisons when the difference is not large;2)bootstrapping confidence estimation provides an accurate confidence interval for the performance comparison measure(e.g.,ratio of geometric means);and 3)when the difference is very small,a single test is often not enough to reveal the nature of the computer performance due to the variability of computer *** further propose using empirical distribution to evaluate computer performance and a five-number-summary to summarize computer *** use published SPEC 2006 results to investigate the sources of performance variation by predicting performance and relative variation for 8,236 *** achieve a correlation of predicted performances of 0.992 and a correlation of predicted and measured relative variation of ***,we propose the utilization of a novel biplotting technique to visualize the effectiveness of benchmarks and cluster machines by *** illustrate the results and concl

关键词： performance of systems variation performance attributes measurement evaluation modeling simulation of multiple-processor systems experimental design Big Data

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PREPARATION OF ROUND BILLETS BY SPRAY FORMING TECHNOLOGY

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中国有色金属学会会刊：英文版 1999年第2期9卷 98-102页

作者： Xiong, Baiqing Zhang, Yong'an Lin, Yaojun Zhang, shaoming Shi, Likai Beijing General Research Inst for Nonferrous Metals Beijing China

１ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｓｐｒａｙｆｏｒｍｉｎｇｔｅｃｈｎｏｌｏｇｙｉｓａｎｅｗｔｅｃｈｎｏｌｏｇｙｆｏｒｍａｋｉｎｇｍａｔｅｒｉａｌｓ．Ｉｔｈａｓｂｅｅｎｄｅｖｅｌｏｐｅｄｏｎｔｈｅｂａｓｉｓｏｆｔｈｅｃ... 详细信息

１ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｓｐｒａｙｆｏｒｍｉｎｇｔｅｃｈｎｏｌｏｇｙｉｓａｎｅｗｔｅｃｈｎｏｌｏｇｙｆｏｒｍａｋｉｎｇｍａｔｅｒｉａｌｓ．Ｉｔｈａｓｂｅｅｎｄｅｖｅｌｏｐｅｄｏｎｔｈｅｂａｓｉｓｏｆｔｈｅｃｏｎｖｅｎｔｉｏｎａｌｒａｐｉｄｓ...

关键词： spray forminground billetsnumerical methodratio of gas flux to melt flux

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不同能量和蛋白质水平对骡鸭生产性能的影响

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上海农业学报 2004年第2期20卷 102-105页

作者：沈洪民殷勤郁怀丹龚绍明何大乾夏来发朱祖明许洪泉上海市农业科学院畜牧兽医研究所上海201106

采用CR71公番鸭×M14奥百星母鸭杂交产生的骡鸭雏苗 36 0羽 ,初生重为 (5 1.6± 3.11)g ,进行能量、蛋白质 2× 3因子试验。日粮ME设 12 .12MJ/kg和 12 .5 4MJ/kg两个水平 ,CP设 2 1.0 %、19.0 %和 17.0 %三个水平共六个处理 (添加剂均... 详细信息

采用CR71公番鸭×M14奥百星母鸭杂交产生的骡鸭雏苗 36 0羽 ,初生重为 (5 1.6± 3.11)g ,进行能量、蛋白质 2× 3因子试验。日粮ME设 12 .12MJ/kg和 12 .5 4MJ/kg两个水平 ,CP设 2 1.0 %、19.0 %和 17.0 %三个水平共六个处理 (添加剂均相同 )。结果表明 ,六个处理中 0～ 3周龄增重以 2组最高 ,ME 12 .12MJ/kg高于 12 .5 4MJ/kg (P 0 .0 5 )。饲料转化率ME间无显著差异 (P >0 .0 5 ) ,CP2 1.0 %和 19.0 %显著高于 17.0 % (P 0 .0 5 )。饲料转化率ME 12 .12MJ/kg高于 12 .5 4MJ/kg (P 0 .0 5 )。结果显示 ,0～ 7周龄骡鸭生长日粮能量皆不宜过高 ,以 12 .12MJ/kg为宜 ,蛋白质 0～ 3周龄 19.0 %、4～ 7周龄 17.0 %即可获得理想的效果。

关键词：骡鸭生产性能能量蛋白质代谢能日粮

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Competing reduction induced homogeneous oxygen doping to unlock MoS_(2)basal planes for faster polysulfides conversion

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Journal of Energy Chemistry 2022年第10期31卷 26-34,I0002页

作者： Da Lei Wenzhe Shang Xu Zhang Yongpeng Li Xiaoshan Shi shaoming Qiao Qian Wang Qiang Zhang Ce Hao Hui Xu Guohua Chen Gaohong he Fengxiang Zhang State Key Laboratory of Fine Chemicals Dalian University of TechnologyDalian 116024LiaoningChina School of Chemical Engineering Dalian University of TechnologyPanjin 124221LiaoningChina Shenzhen ApogeeTec Greenergy Co.Ltd. Shenzhen 518000GuangdongChina Department of Mechanical Engineering Research Institute for Smart EnergyThe Hong Kong Polytechnic UniversityKowloonHong Kong 999077China

The parasitic polysulfides shuttle effect greatly hinders the practical application of lithium sulfur batteries,and this issue can be addressed by promoting polysulfides conversion with catalytic materials such as Mo S_(2).However,the catalytic activity of Mo S_(2)mainly relies on edge sites,but is limited by inert basal *** herein report a novel,facile,ethylene glycol enabled competing reduction strategy to dope Mo S_(2)homogeneously with oxygen atoms so that its inert basal planes can be *** glycol works as a reducing agent and competes with thiourea to react with ammonium molybdate,leading to insufficient sulfuration of Mo,and consequent formation of O-Mo S_(2).Our theoretical and experimental investigations indicate that the homogeneously distributed O dopants can create abundant adsorption/-catalytic sites in the Mo S_(2)basal planes,enlarge the inter-plane distance to promote ion transport,and thus enhance the catalytic conversion of *** oxygen doped Mo S_(2)(O-Mo S_(2))is supported on carbon nanosheets(CNS)and the composite(O-Mo S_(2)/CNS)is employed to modify the separator of Li-S *** gives the battery an initial discharge capacity of 1537 m Ah g-1at 0.2 C,and the battery retains a discharge capacity of 545 m Ah g-1after ultra-long 2000 cycles at 1 C,corresponding to a very small cyclic decay rate of 0.0237%.Even under a raising sulfur loading of 8.2 mg cm^(-2),the Li-S battery also delivers a high discharge capacity(554 m Ah g^(-1))with outstanding cycle stability(84.6%capacity retention)after 100 cycles at 0.5 *** work provides a novel,facile approach to fabricate highly catalytically active oxygen-doped Mo S_(2)for advanced Li-S batteries.

关键词： Competing reduction One-pot Oxygen-doped MoS_(2) Unlocked basal plane Li-S batteries

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