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Computation of rolling resistance caused by rubber hysteresis of truck radial tire

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第5期8卷 778-785页

作者： MA Gai-ling XU Hong cui Wen-yong College of Mechanical and Electrical Engineering Beijing University of Chemical Technology Beijing 100029 China

Applying the results of stress and strain calculated by 3D finite element model of truck radial tire 11.00R20, a MATLAB program used to compute rolling resistance of the tire caused by hysteresis rolling resistance (HRR) is worked out. The HRR distribution on different part of tire section, and the effects of speed, load, internal pressure and the width of the rim on HRR are analyzed. The analysis results showed that energy loss produced by tread rubber contributes the most part to HRR of the whole tire, and that to decrease the HRR, the hysteresis factor of the tread rubber should be reduced, and the distribution of the stress and strain on the section be optimized.

关键词： Truck radial tire Hysteresis rolling resistance (HRR) Finite element analysis (FEA) Hysteresis factor Tire structuredesign

Biomimetic transformation of gentiopicroside to erythrocentaurin

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Chinese Chemical Letters 2009年第2期20卷 150-152页

作者： cui ling Wang Jian Li Liu Zhu Lan Liu Xin Sheng Li xiao Yong Cao School of Life Science Northwest University Xi'an 710069 China Department of Biology Shaanxi University of Technology Hanzhong 723001 China

Biomimetic transformation of gentiopicroside was carded out by β-glucosidase at pH 7.0 for 3 days at 37 ℃. Two products, erythrocentaurin and 5,6-dihydro-5-formyl-6-methyl-1H,3H-pyrano[3,4-c]pyran-1-one were isolate... 详细信息

关键词： Gentiopicroside Biomimetic transformation β-Glucosidase Erythrocentaurin 5,6-Dihydro-5-formyl-6-methyl-1H,3H-pyrano[3,4-c]pyran-1-one

Wheel-rail Profiles Matching Design Considering Railway Track Parameters

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Chinese Journal of Mechanical Engineering 2010年第4期23卷 410-417页

作者： cui Dabin LI Li JIN Xuesong LI ling School of Mechanical Engineering Southwest Jiaotong University Chengdu 610031 China State Key Laboratory of Traction Power Southwest Jiaotong University Chengdu 610031 China

The profile of wheel/rail has great concern with the vehicle running safety, the wheel/rail wear and the rolling contact fatigue between wheel and rail, due to its severer impact on the dynamic behavior of both the railway vehicle/track, and the wheel/rail rolling contact status. However, recent studies in this respect are mainly explored in reverse methods, where track parameters are predetermined and invariable during the optimizing process. This paper attempts to propose a wheel-rail profiles matching design method considering multi-parameter, through optimizing wheel/rail profile under different rail cants and track gauges, based on the existed optimization technology for the normal gap of wheel/rail. The method presented in this paper can also, compared with the prior reverse methods, be called ＂forward solution method＂ in which the riding comfort, wheel unloading rate and wheel/rail contact stress of the speed-up railway passenger car are calculated by means of a vehicle-track coupling dynamic model, with the range of the rail cant varying from 1/20 to 1/40 and the rail gauge from 1 433 mm to 1 441 mm. These results show that the distribution status of the pairs of contact points can be obviously improved and the contact stress can be reduced significantly; a great influence is exposed by the rail cant and track gauge on the dynamic behavior of the high speed passenger car, and an optimal vehicle dynamics behavior are obtained with the optimized wheel/rail profile when the rail cant is 1/30 and the track gauge is 1 435 mm. This research can provide important references for the investigation of the wheel-rail profiles matching design method considering multi-parameter.

关键词： wheel profile optimization dynamic behavior rail cant track gauge

Study of hydraulic transport characteristics and erosion wear of twisted four-lobed pipe based on CFD-DEM

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Particuology 2024年第12期95卷 356-369页

作者： Chunya Sun Zhifang Xu Yanqiu xiao Guangzhen cui Zhengdong xiao Wanbin cui Pengpeng Wang Lianhui Jia Henan Collaborative Innovation Center of Intelligent Tunnel Boring Machine Zhengzhou University of Light IndustryZhengzhou450000China College of Mechanical and Electrical Engineering Zhengzhou University of Light IndustryZhengzhou450001China China Railway Engineering Equipment Group Co Ltd.Zhengzhou450016China

Pipeline hydraulic transportation is extensively utilized across diverse sectors,with enhancing the performance of pipeline hydrodynamic transport and minimizing erosion wear on the pipeline walls being essential for ensuring the stability of pipeline *** paper introduces a methodology for the hydraulic transport of a twisted four-lobed pipe,employing a numerical and erosion model developed through the CFD-DEM(computational fluid dynamics and discrete element method)coupling *** experimental circulating flow platform is constructed for validation *** performance of the pipe is assessed by analyzing key indices including fluid velocity,pressure drop,particle trajectory,and erosion *** results indicate that twisted four-lobed pipe enhances fluid flow rates,facilitating particle discharge and mitigating accumulation,with reduced wear compared to the twin twist triangle spiral *** analysis of structural parameters’impact on hydraulic conveyance is also *** findings offer theoretical insights for optimizing pipeline performance in hydraulic conveyance while minimizing wear.

关键词： Hydraulic transport CFD-DEM Twisted four-lobed pipe Erosion wear

Inverse Coefficient Problems for Elliptic Hemivariational Inequalities

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Chinese Annals of Mathematics,Series B 2010年第4期31卷 473-480页

作者： cui＇e xiao Zhenhai LIU School of Mathematical Sciences and Computing Technology Central South University Changsha 410075 China Department of Mathematics and Computation Sciences Hunan City University Yiyang 413000 Hunan China School of Mathematics and Computer Science Guangxi University for Nationalities Nanning 530006 China

This paper is devoted to a class of inverse coefficient problems for nonlinear elliptic hemivariational inequalities. The unknown coefficient of elliptic hemivariational inequalities depends on the gradient of the solution and belongs to a set of admissible coefficients. It is shown that the nonlinear elliptic hemivariational inequalities are uniquely solvable for the given class of coefficients. The result of existence of quasisolutions of the inverse problems is obtained.

关键词： Elliptic hemivariational inequality Inverse coefficient problem Existence of quasisolution

In situ anchor of magnetic Fe304 nanoparticles onto natural maifanite as efficient heterogeneous Fenton-like catalyst

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Frontiers of Materials Science 2016年第3期10卷 300-309页

作者： Hang ZHAO ling WENG Wei-Wei cui xiao-Rui ZHANG Huan-Yan XU Li-Zhu LIU School of Materials Science and Engineering Harbin University of Science and Technology Harbin 150040 China

In situ anchor of magnetic Fe304 nanoparticles （NPs） onto the surface of natural maifanite was realized by chemical oxidation coprecipitation in hot alkaline solution. The Fe304/maifanite composites were characterized by XRD, FTIR, SEM, and TEM. These results indicated that polycrystalline Fe304 NPs with inverse spinel structure were formed and tightly dispersed on maifanite surface. Based on the measurement of surface Zeta potential of maifanite at different medium pHs, the possible combination mechanism between natural maifanite and Fe304 NPs was proposed. Then, the as- obtained composites were developed as highly efficient heterogeneous Fenton-like catalyst for the discoloration of an azo dye, Methyl Orange （MO）. The comparative tests on MO discoloration in different systems revealed that Fe304/maifanite composite exhibited much higher Fenton-like catalytic activity than Fe304 NPs and the heterogeneous Fenton- like reaction governed the discoloration of MO. Kinetic results clearly showed that MO discoloration process followed the second-order kinetic model. Fe304/maifanite compo- sites exhibited the typical ferromagnetic property detected by VSM and could be easily separated from solution by an external magnetic field.

关键词： maifanite Fe304 NPs mechanism Fenton-like catalyst Methyl Orange (MO)

Continuous high-temperature rapid nanomanufacturing of electrocatalysts

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Nano Research 2025年第1期18卷 225-235页

作者： xiaoyang Wang Ziyi Luo Baihua cui Ziqi Fu Yanchang Liu Weidi Liu Jia Ding Jianrong Zeng Yanan ChenWenbin Hu School of Materials Science and Engineering Tianjin UniversityTianjin 300350China Australian Institute for Bioengineering and Nanotechnology The University of QueenslandSt.LuciaBrisbane 4072Australia Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China

Encapsulating metal nanoparticles in carbon shells(Metal@C)to enhance catalytic activity and stability has been certified ***,most existing methods for preparing Metal@C are complex,time-consuming,and lack of *** this study,a novel method that couples the high-temperature shock(HTS)with ultrasonic spray pyrolysis is reported,which can realize facile and scalable production of various Metal@C through the pyrolysis of glucose and metal chloride *** proposed HTS ultrasonic spray pyrolysis offers several advantages,including compact size,short reaction time(~120 ms),and uniform *** the Ni@C-40 nanocomposite as an example,the ultrasmall Ni nanoparticles(~10 nm)with thin carbon protective shells(~2 nm)are uniformly dispersed in the carbon matrix and applied for oxygen evolution reaction(OER)in alkaline *** Ni@C-40 optimized by tuning the thickness of carbon shell exhibits significantly enhanced OER activity with low overpotential of 242 mV at 10 mA·cm^(-2) and stability,which is attributed to the optimized interactions between Ni nanoparticles and carbon *** method also shows promise for continuous pyrolysis synthesis of various extreme materials at ultra-high temperatures using alternative electric heating materials.

关键词： ultrasonic spray pyrolysis high-temperature shock carbon shell oxygen evolution reaction Metal@C nanocomposite

Accumulation of 1-deoxynojirimycin in silkworm,Bombyx mori L.

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2010年第4期11卷 286-291页

作者： Hao YIN Xin-qin SHI Bo SUN Jing-jing YE Zu-an DUAN xiao-ling ZHOU Wei-zheng cui xiao-feng WU Key Laboratory of Agricultural Ecology and Environment College of Forestry Shandong Agricultural University Taian 2 71018 China Institute of Sericultural Sciences of Siehuan Province Nanchong 637000 China College of Animal Science Zhejiang University Hangzhou 310029 China

1-deoxynojirimycin (1-DNJ) contents in the silkworm,Bombyx mori,at different developmental stages and tissues were investigated by using reverse-phase high-performance liquid chromatography. The 1-DNJ contents of silkworm larvae change significantly with their developmental stages. The male larvae showed higher accumulation efficiency of 1-DNJ than the females and also a significant variation was observed among the silkworm strains. The present results show that tissue distribution of 1-DNJ was significantly higher in blood,digestive juice,and alimentary canal,but no 1-DNJ was observed in the silkgland. Moreover,1-DNJ was not found in silkworms fed with artificial diet that does not contain mulberry leaf powder. This proves that silkworms obtain 1-DNJ from mulberry leaves; they could not synthesize 1-DNJ by themselves. The accumulation and excretion of 1-DNJ change periodically during the larval stage. There was no 1-DNJ in the newly-hatched larvae and 1-DNJ was mainly accumulated during the early and middle stages of every instar,while excreted at later stages of larval development. Further,it is possible to extract 1-DNJ from the larval feces and it is optimal to develop the 1-DNJ related products for diabetic auxiliary therapy.

关键词： Silkworm 1-deoxynojirimycin (1-DNJ) Accumulation Bombyx mori

Laparoscopic hepaticoplasty using gallbladder as a subcutaneous tunnel for hepatolithiasis

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World Journal of Gastroenterology 2014年第12期20卷 3350-3355页

作者： Long cui Zhi Xu xiao-Feng ling Li-Xin Wang Chun-Sheng Hou Gang Wang xiao-Si Zhou Department of General Surgery Peking University Third Hospital

AIM: To investigate the feasibility, efficacy and safety of laparoscopic hepaticoplasty using gallbladder as subcutaneous tunnel and sphincter-of-Oddi preservation for hepatolithiasis.

关键词： Hepatolithiasis Laparoscopy Hepaticoplasty Minimally invasive surgery Subcutaneous tunnel