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Characterization of the asymmetric evolving yield and flow of 6016-T4 aluminum alloy and DP490 steel

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Journal of Materials Science & Technology 2023年第2期133卷 209-229页

作者： Kai Du shaohui Huang Yong Hou Haibo Wang Yinxiao Wang Wentao Zheng Xiaoguang Yuan School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China Department of Technical Planning Press Shop BMW Brilliance Automotive Ltd.Shenyang 100044China Department of Materials Science and Engineering&RIAM Seoul National UniversitySeoul 08826Republic of Korea School of Mechanical and Materials Engineering North China University of TechnologyBeijing 100144China

6016-T4 aluminum alloy and DP490 steel were systematically tested under 24 proportional loading paths,including uniaxial tensile tests with a 15°increment,uniaxial compressive and simple shear tests with a 45°increment,and biaxial tensile tests using cruciform *** specimens in the rolling/transverse and 45°/135°sampling directions were tested with seven and four different stress ra-tios,*** normal and diagonal planes plastic work contours and the yield stresses under uniaxial tension and compression were measured to investigate the anisotropic ***,the normal and diagonal planes directions of plastic strain rate and the rα-values under uniaxial tension and compression were characterized to confirm the plastic *** existing asymmetric yield crite-ria under the associated and non-associated flow rules were comprehensively evaluated to describe the asymmetric plastic anisotropy of 6016-T4 aluminum alloy and DP490 *** results suggest that in the investigated yield criteria,the non-associated models can predict the tension and compression asym-metry of materials more accurately than the associated models,and the function of stress triaxiality can more effectively describe the asymmetric yield behavior than the first stress *** addition,the pure shear stress states are helpful in assessing the validity and applicability of advanced asymmetric yield stress functions,and the inspection of diagonal plane plastic work contours containing more pure shear stress states should prioritized over that of normal plane plastic work *** evaluation of plastic potential functions should not only consider the prediction accuracy of the normal plane di-rections of plastic strain rate,but also further check the diagonal plane directions of plastic strain *** mechanical properties as a function of equivalent plastic strain to calibrate parameters of the yield criterion allows the continuous capture of anisot

关键词： Proportional loading paths Diagonal plane Asymmetric yield criterion Non-associated flow rule Anisotropic hardening Sheet metal forming

Chemical Scissors Tailored Nano‑Tellurium with High‑Entropy Morphology for Efficient Foam‑Hydrogel‑Based Solar Photothermal Evaporators

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Nano-Micro Letters 2024年第3期16卷 149-168页

作者： Chenyang Xing Zihao Li Ziao Wang shaohui Zhang Zhongjian Xie Xi Zhu Zhengchun Peng State Key Laboratory of Radio FrequencyHeterogeneous Integration Shenzhen UniversityShenzhen 518060People’s Republic of China Center for Stretchable Electronics and NanoSensors College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060People’s Republic of China School of Science and Engineering The Chinese University of Hong KongShenzhenShenzhen 518172People’s Republic of China Institute of Pediatrics Shenzhen Children’s HospitalShenzhen 518038GuangdongPeople’s Republic of China International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060People’s Republic of China

The development of tellurium(Te)-based semiconductor nanomaterials for efficient light-to-heat conversion may offer an effective means of harvesting sunlight to address global energy ***,the nanosized Te(nano-Te)materials reported to date suffer from a series of drawbacks,including limited light absorption and a lack of surface ***,we report the preparation of nano-Te by electrochemical exfoliation using an electrolyzable room-temperature ionic ***,cations,and their corresponding electrolytic products acting as chemical scissors can precisely intercalate and functionalize bulk *** resulting nano-Te has high morphological entropy,rich surface functional groups,and broad light *** also constructed foam hydrogels based on poly(vinyl alcohol)/nano-Te,which achieved an evaporation rate and energy efficiency of 4.11 kg m^(−2)h^(−1)and 128%,respectively,under 1 sun ***,the evaporation rate was maintained in the range 2.5-3.0 kg m^(−2)h^(−1)outdoors under 0.5-1.0 sun,providing highly efficient evaporation under low light conditions.

关键词： Tellurium High entropy Electrochemical modification Solar absorption Evaporation rate

Loading-Balance Relay-Selective Strategy Based on Stochastic Dynamic Program

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Tsinghua Science and Technology 2018年第4期23卷 493-500页

作者： Wei Zhao Lin Zhao Weidong Wu Sigen Chen shaohui Sun Yong Cao Information and Communication Branch Heilongjiang Electric Power Company (LTD) SGCC School of Mathematics Science Heilongjiang University

A Relay-Assisted （RA） network with relay selection is considered as a type of effective technology to improve the spectrum and energy efficiency of a cellular network. However, loading balance of the assisted relay node becomes an inevitable bottleneck in RA network development because users do not follow uniform distribution. Furthermore, the time-varying channel condition of wireless communication is also a major challenge for the RA network with relay selection. To solve these problems and improve the practicability of the RA network, a Loading Balance-Relay Selective （LBRS） strategy is proposed for the RA network in this paper. The proposed LBRS strategy formulates the relay selection of the RA network under imperfect channel state information assumption as a Multistage Decision （MD） problem. An optimal algorithm is also investigated to solve the proposed MD problem based on stochastic dynamic program. Numerical results show that the performance of the LBRS strategy is better than that of traditional greedy algorithm and the former is effective as an exhaustive search-based method.

关键词： relay-assisted network relay selection stochastic dynamic program

Treatment of drilling wastewater using a weakly basic resin

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Petroleum Science 2008年第3期5卷 275-279页

作者： Lu Rongh Mu Bo Zhang Hongyan Guo shaohui School of Chemical Science ＆ Engineering China University of Petroleum Beijing 102249 China

Macroporous weak basic anion exchanger （D301R） was used to remove organic substances from drilling wastewater. The effect of pH, temperature and contact time on adsorption behavior was investigated in batch experiments, which indicated that the COD （Chemical Oxygen Demand） removal ratio of drilling wastewater was approximately 90%, and the COD of treated wastewater was below 70 mg/L under appropriate operating conditions. A mixed liquor of NaOH and NaCI was selected as desorbent because of its better elution performance. The results of column dynamic adsorption and regeneration showed that the COD of wastewater could be efficiently removed by D301R resin, and the resin was easily regenerated by the selected desorbent.

关键词： Ion-exchange drilling wastewater weak basic anion resin wastewater treatment

Isolation and Characteristics of a Microbial Consortium for Effectively Degrading Phenanthrene

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Petroleum Science 2007年第3期4卷 68-75页

作者： Wang Jing Xu Hongke Guo shaohui School of Chemical Science ＆ Engineering China University of Petroleum Beijing 102249 China

A microbial consortium （named W4） capable of aerobic biodegradation of solid phenanthrene as the sole source of carbon and energy was isolated by selective enrichment from petroleum-contaminated soil in the Henan oilfield, China. The strains of the consortium were identified as Sphingomonas cloacae, Rhizobium sp., Pseudomonas aeruginosa and Achromobacter xylosoxidans respectively by means of genetic methods. The major metabolites of phenanthrene were analyzed by gas chromatography-mass spectrometry （GC-MS）. The biodegradation percentage of solid phenanthrene at 200 mg/L in liquid medium after 7 days of growth was greater than 99%. The degradation of phenanthrene was compared between individual predominant strains and the microbial consortium in different treatment processes. The microbial consortium showed a significant improvement of phenanthrene degradation rates in either static or shaking culture. The degradation percentage of phenanthrene by the consortium W4 decreased to some degree when C 16 coexisted, however it was hardly affected by C30. Furthermore, the ability of consortium W4 to remediate oil sludge from the Dagang oil refinery was studied by composting, and it was found that the consortium W4 could obviously remove polycyclic aromatic hydrocarbons （PAils） and paraffinic hydrocarbons. All the results indicated that the microbial consortium W4 had a promising application in bioremediation of oil-contaminated environments and could be potentially used in microbial enhanced oil recovery （MEOR）.

关键词： Phenanthrene consortium biodegradation bioremediation

HPLC determination of glyoxal in aldehyde solution with 3-methyl-2-benzothiazolinone hydrazone

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Frontiers of Chemical Science and Engineering 2011年第1期5卷 117-121页

作者： Yamei ZHU Xiaoli YAO shaohui CHEN Qun CUI Haiyan WANG College of Chemistry and Chemical Engineering Nanjing University of TechnologyNanjing 210009China Yangzi Institute Sinopec Yangzi Petrochemical Company Ltd.Nanjing 210048China

Based on the absorption property of a diazine that can be formed by reaction of glyoxal and 3-methyl-2-benzothiazolinone hydrazone(MBTH)in the Ultravioletvisible(UV-vis)spectral region,a HPLC method was developed for the determination of glyoxal in acetaldehyde *** was derivatised from MBTH and the derivatives(diazine)were analyzed by HPLC for identification and *** determination was performed on a ZORBAX Eclipse XDB-C18 column(4.6250 mm,5 mm)at 35℃ with an injection volume of 10 mL,using a mixture of acetonitrile-water solvent(99∶5,v∶v)as a mobile phase with a flow rate of 0.8 mL·min^(–1).The proper derivative reaction conditions were the temperature of 70℃,MBTH to carbonyl molar ratio of 12,and reaction time of 110 *** glyoxal diazine was a yellow dye with a maximum molar absorptivity at 401 nm and its retention time was 5.2 min under optimal HPLC *** standard curve for glyoxal had a strong linear relationship with a regression coefficient(R2=0.999)in the range of 0.002–0.020 g·L^(–1).The analysis of glyoxal in an oxidising solution gave accurate results with a relative standard deviation(RSD)value of 0.55%.The average relative recovery was 102%.This efficient HPLC technique is also proposed for detecting other dicarbonyl compounds besides glyoxal.

关键词： HPLC glyoxal 3-methyl-2-benzothiazolinone hydrazone diazine dicarbonyl compounds

A New Microwave-millimeterwave Amplitude-phase Measurement System And Applications 3

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A New Microwave-millimeterwave Amplitude-phase Measurement S...

Dynamic response analysis of a multiple-beam structure subjected to a moving load

2002 3rd International Conference on Microwave and Millimeter Wave Technology

作者： Quan shaohui He Guoyu Xu Yongbin E.E.Dept. Beijing University of Aeronautics and Astronautics

ISBN: (纸本)078037486X

＜正＞A new microwave-millimeterwave amplitude-phase measurement system and its typical applications are proposed in this *** with traditional system,it is typical of novel principle, simple construction,easy frequency band expansibility and convenient *** system configuration and two expanded applications,remote testing and local testing are *** far,this system has been applied in many fields successfully, such as CATR electric performance testing,antenna pattern measurement and RCS measurement,with the frequency band from 1 GHz to *** system has been patented and appraised by government.

关键词： microwave amplitude-phase measurement system microwave receiver antenna measurement CATR RCS

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Earthquake Engineering and Engineering Vibration 2022年第3期21卷 769-784页

作者： Zhang Yuntai Jiang Lizhong Zhou Wangbao Liu shaohui Feng Yulin Liu Xiang Lai Zhipeng School of Civil Engineering Central South UniversityChangsha 410075China National Engineering Laboratory for High Speed Railway Construction Changsha 410075China School of Civil Engineering and Architecture East China Jiaotong UniversityNanchang 330013China

In this study,the dynamic response of an elastically connected multi-beam structure subjected to a moving load with elastic boundary conditions is *** boundary conditions and properties of each beam vary,and the difficulty of solving the motion equation is reduced by using a Fourier series plus three special *** examining a high-speed railway(HSR)with mixed boundary conditions,the rationality for the newly proposed method is verified,the difference in simulated multiple-beam models with different beam numbers is explored,and the influence of material parameters and load speed on the dynamic response of multiple-beam structures is *** suggest that the number of beams in the model should be as close to the actual beam number as *** with an appropriate beam number can be used to describe in detail the dynamic response of the *** the track-structure can overestimate the resonant speed of a high-speed railway,simply-supported beam *** effective interval of foundation stiffness(EIFS)can provide a reference for future engineering designs.

关键词： multiple-beam dynamic analysis moving load mixed boundary conditions

Experimental study on the influences of cutter geometry and material on scraper wear during shield TBM tunnelling in abrasive sandy ground

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Journal of Rock Mechanics and geotechnical Engineering 2024年第2期16卷 410-425页

作者： shaohui Tang Xiaoping Zhang Quansheng Liu Qi Zhang Xinfang Li Haojie Wang Key Laboratory of Safety for geotechnical and Structural Engineering of Hubei Province School of Civil EngineeringWuhan UniversityWuhan430072China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan430072China

When shield TBM tunnelling in abrasive sandy ground,the rational design of cutter parameters is critical to reduce tool wear and improve tunnelling ***,the influence mechanism of cutter parameters on scraper wear remains unclear due to the lack of a reliable test *** and material optimisation are often based on subjective experience,which is unfavourable for improving scraper geological *** the present study,the newly developed WHU-SAT soil abrasion test was used to evaluate the variation in scraper wear with cutter geometry,material and *** influence mechanism of cutter parameters on scraper wear has been revealed according to the scratch characteristics of the scraper *** geometry and material parameters have been optimised to reduce scraper *** results indicate that the variation in scraper wear with cutter geometry is related to the cutting resistance,frictional resistance and stress *** appropriate increase in the front angle(or back angle)reduces the cutting resistance(or frictional resistance),while an excessive increase in the front angle(or back angle)reduces the edge angle and causes stress *** optimal front angle,back angle and edge angle for quartz sand samples areα=25°,β=10°andγ=55°,*** wear resistance of the modelled scrapers made of different metal materials is related to the chemical elements and *** wear resistances of the modelled scrapers made of 45#,06Cr19Ni10,42CrMo4 and 40CrNiMoA are 0.569,0.661,0.691 and 0.728 times those made of WC-Co,*** the alloy hardness is less than 47 HRC(or greater than 58 HRC),scraper wear decreases slowly with increasing alloy hardness as the scratch depth of the particle asperity on the metal surface stabilizes at a high(or low)***,when the alloy hardness is between 47 HRC and 58 HRC,scraper wear decreases rapidly with increasing alloy hardness as the scratch depth transitions

关键词： Shield TBM Scraper wear Cutter shape Metal material Alloy hardness