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Discrete element simulation of effects of multicontact loading on single particle crushing

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Particuology 2022年第10期20卷 49-60页

作者： Chuanfeng Fang Zhihong Nie Jian Gong Bo Li wei hu Ashiru Mohammed School of Civil Engineering Central South UniversityChangsha 410075China College of Civil of Engineering and Architecture Guangxi UniversityNanning530004China College of Architecture and Civil Engineering Wenzhou UniversityWenzhou 325035China hunan Province Key Laboratory of Geotechnical Engineering Stability Control and Health Monitoring Hunan University of Science and TechnologyXiangtan411201China

Particle crushing commonly occurs in granular materials and affects their structures and mechanical *** idealized particles in experimental single particle crushing tests with two loading points,natural particles are crushed under multicontact *** date,the criteria and patterns of par-ticle crushing under multicontact conditions are not fully *** using the three-dimensional discrete element method,this report explores the effect of multicontact loading on the crushing criterion of a single particle,the crushing pattern,and the relationship between the particle crushing strength and loading *** particles are modelled as aggregates of glued Voronoi *** numer-ical results indicate that the logarithm of the mean principal stress has a good linear correlation with the coordination *** a specific coordination number,the number of child particles presents a significant normal *** a specific number of child particles,the volumes of child particles can be statistically described as normal or gamma *** typical models are proposed to qual-itatively analyse the relationship between the loading distribution and crushing *** relevant conclusions can be helpful in engineering practice and in further studies on crushable granular materials via the discrete element method.

关键词： DEM Multiple contacts Particle crushing Crushing criterion Crushing pattern Loading distribution

Improving the mechanical property of dissimilar Al/Mg hybrid friction stir welding joint by PIO-ANN

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Journal of Materials Science & Technology 2020年第18期52卷 41-52页

作者： wei hu Zhongwei Ma Shude Ji Qi Song Mingfei Chen Wenhui Jiang College of Aerospace Engineering Shenyang Aerospace UniversityShenyang 110136China Engineering Research Center of Industrial-grade Multi-rotor UAV of Liaoning Province Shenyang 110136China SLZY(Shenyang)High-tech Co LtdShenyang 1101172China

Ultrasonic-stationary shoulder assisted friction stir welding(U-SSFSW)is a novel hybrid welding technique,which reveals promising prospect in joining Al/Mg dissimilar alloys.A thorough understanding of U-SSFSW process is imperative for the further application of this ***-inspired optimization(PIO)is a swarm intelligent optimization algorithm and is proposed in mathematical modeling and process optimization by artificial *** this study,PIO optimized artificial neural network(PIOANN)was firstly established to acquire the relationships between the inputs and output of the Al/Mg welding process by U-SSFSW technique.A reliable PIO-ANN was achieved and the joint with a tensile strength of 161 MPa was acquired under the PIO optimized *** tensile strength is higher than any ever-reported results with the similar welding *** joint formation,microstructure,microhardness and fracture behaviors were systemically investigated based on the reported studies and the confirmation experiment of this study to explore the enhancing mechanism of U-SSFSW Al/Mg joint.

关键词： Hybrid friction stir welding Al/Mg dissimilar alloys Artificial neural network Pigeon-inspired optimization Ultrasonic

A novel seal-flow multi-vortex friction stir lap welding of metal to polymer matrix composites

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Chinese Journal of Aeronautics 2024年第1期37卷 451-462页

作者： Shuaiqiang NIAN Mingshen LI Shude JI wei hu Zhiqing ZHANG Zelin SUN College of Aerospace Engineering Shenyang Aerospace UniversityShenyang 110136China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

The friction stir lap welding(FSLW)of metal to polymer is a challenging work due to the unavoidable polymer *** this problem,a novel seal-flow multi-vortex friction stir lap welding(SM-FSLW)technology based on the subversively-designed multi-step pin was put *** 7075 aluminum alloy and short glass fiber-reinforced polyether ether ketone(PEEK)as research subjects,the welding temperature,material flow,formation and tensile shear strength of dissimilar materials lap joint under the SM-FSLW were studied and compared with those under traditional FSLW based on the conical *** multi-step pin rather than the conical pin effectively hindered the polymer overflowing due to the formation of vortexes by the step,thereby attaining a joint with a smooth *** with traditional FSLW,the SMFSLW obtained the higher welding temperature,the more violent material flow and the larger area with high flow velocity,thereby producing the macro-mechanical and micro-mechanical interlockings and then heightening the joint loading *** tensile shear strength of lap joint under SM-FSLW was 27.8% higher than that under traditional *** SM-FSLW technology using the multi-step pin provides an effective way on obtaining a heterogeneous lap joint of metal to polymer with the excellent formation and high strength.

关键词： Friction stir lap welding Metal to polymer Multi-step pin Material flow Tensile shear strength

Manufacturing enterprise collaboration network:An empirical research and evolutionary model

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Chinese Physics B 2020年第8期29卷 553-563页

作者： Ji-wei hu Song Gao Jun-wei Yan Ping Lou Yong Yin School of Information Engineering Wuhan University of TechnologyWuhan 430070China hubei Key Laboratory of Broadband Wireless Communication and Sensor Wuhan University of TechnologyWuhan 430070China

With the increasingly fierce market competition,manufacturing enterprises have to continuously improve their competitiveness through their collaboration and labor division with each other,*** manufacturing enterprise collaborative network(MECN)through their collaboration and labor division is an effective guarantee for obtaining competitive *** explore the topology and evolutionary process of MECN,in this paper we investigate an empirical MECN from the viewpoint of complex network theory,and construct an evolutionary model to reproduce the topological properties found in the empirical ***,large-size empirical data related to the automotive industry are collected to construct an *** analysis indicates that the MECN is not a scale-free network,but a small-world network with ***-world property indicates that the enterprises can respond quickly to the market,but disassortativity shows the risk spreading is fast and the coordinated operation is ***,an evolutionary model based on fitness preferential attachment and entropy-TOPSIS is proposed to capture the features of ***,the evolutionary model is compared with a degree-based model in which only node degree is taken into *** simulation results show the proposed evolutionary model can reproduce a number of critical topological properties of empirical MECN,while the degree-based model does not,which validates the effectiveness of the proposed evolutionary model.

关键词： manufacturing enterprise collaboration network complex network topological properties fitness preferential attachment

Recent advances in electrochemical synthesis of urea via C-N coupling

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Journal of Energy Chemistry 2024年第11期98卷 294-310页

作者： Chen Wang Wenqi Gao wei hu wei Wen Shengfu Wang Xiuhua Zhang Dafeng Yan Bao Yu Xia hubei Key Laboratory for Precision Synthesis of Small Molecule Pharmaceuticals&Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules&College of Chemistry and Chemical Engineering Hubei UniversityWuhan 430062HubeiChina School of Chemistry and Chemical Engineering State Key Laboratory of Materials Processing and Die&Mould TechnologyKey Laboratory of Material Chemistry for Energy Conversion and Storage(Ministry of Education)Hubei Key Laboratory of Material Chemistry and Service FailureWuhan National Laboratory for OptoelectronicsHuazhong University of Science and Technology(HUST)Wuhan 430074HubeiChina

Urea is widely used as fertilizer and is a key substance supporting global food production. However, the traditional industrial synthesis of urea faces the challenges with high energy consumption and serious environmental problems. With the increasing global demand for environmental protection and sustainable development, it is much necessary to develop novel and clean methods for the synthesis of *** provides an efficient and renewable synthesis route that can directly produce urea at room temperature and atmospheric pressure by the coupling of CO_(2) and nitrogenous molecules. In this review, we summarized the most recent advances in electrochemical synthesis of urea via CAN coupling systematically, focusing on the coupling of CO_(2) and different nitrogen sources. And the associated coupling mechanism, catalysts optimization, and electrolyzer design are well discussed. Moreover, the challenges and future directions for electrocatalytic CAN coupling are prospected. This review will provide timely and valuable guidance for others and attract more interests to promote the development of electrochemical synthesis of urea or other valuable chemicals containing CAN bond.

关键词： Electrocatalysis CAN coupling Urea synthesis CO_(2)and N_(2)fixation

Anti-epidermal growth factor receptor monoclonal antibodies in metastatic colorectal cancer: A meta-analysis

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World Journal of Gastroenterology 2015年第14期21卷 4365-4372页

作者： Qi-Bin Song Qi Wang wei-Guo hu Department of Oncology Renmin Hospital of Wuhan University

AIM: To investigate the correlation between Kirsten rat sarcoma viral oncogene homolog(KRAS) status and the therapeutic effects of anti-epidermal growth factor receptor(EGFR) monoclonal antibodies(Mo Abs) in metastatic colorectal cancer(m CRC).METHODS: Randomized controlled trials(RCTs) were identified and the association between KRAS mutation and clinical outcome in m CRC patients treated with anti-EGFR Mo Abs was *** RCTs wereincluded in this ***-free survival and overall survival were used to assess the strength of the relationship between KRAS mutation and clinical ***: In first-line treatment, survival benefit was confined to patients with wild-type *** regimens and angiogenesis inhibitor treatment influenced the results of the *** KRAS m CRC patients did not seem to benefit from oxaliplatin-based chemotherapy(PFS: HR = 0.88, 95%CI: 0.70-1.10; OS: HR = 0.93, 95%CI: 0.82-1.04).Clinical benefit in m CRC patients was limited to therapeutic regimens which included anti-EGFR Mo Abs and fluorouracil-based therapy(PFS: HR = 0.77, 95%CI: 0.69-0.86; OS: HR = 0.85, 95%CI: 0.75-0.95).When anti-EGFR Mo Abs were used as second- or further-line treatment, clinical benefit was still confined to patients with wild-type ***: KRAS status is a potential predictive marker of clinical benefit due to anti-EGFR Mo Ab therapy in m CRC patients.

关键词： Colorectal neoplasm Kirsten rat sarcoma viral onco

Granulosa cell proliferation differentiation and its role in follicular development

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Chinese Science Bulletin 2005年第23期50卷 2665-2671页

作者： LU Cuiling YANG wei hu Zhaoyuan LIU Yixun State Key Laboratory of Reproductive Biology Institute of ZoologyChinese Academy of Sciences Beijing 100080 China

Granulosa cells (GCs) are the most important cells in the ovary that undergo serious changes morphologi- cally and physiologically during the processes of follicular proliferation, differentiation, ovulation, lutenization and atresia. Oocyte (OC) directs GC proliferation and differen- tiation, while GCs influence OC maturation. Many ovarian factors are involved in the regulation of these processes via different molecular mechanisms and signal pathways. P38 MAPK can selectively regulate steroidogenesis in GCs con- trolled by FSH; Transcript factors LRH-1 and DAX-1 play an important role in this process; FSH induces GC prolifera- tion and differentiation by stimulating PCNA and StAR ex- pression and steroidogenesis. Activated ERK1/2 signal pathway may be involved in the FSH-regulated GC prolif- eration and differentiation. Therefore,GC is an ideal model for studying cell proliferation, differentiation and interaction as well as signal transduction. This review briefly summa- rizes the latest data in the literature, including the results achieved in our laboratory.

关键词：粒细胞卵母细胞细胞增殖卵泡发育信号转换

An Iterative Thresholding Method for the Minimum Compliance Problem

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Communications in Computational Physics 2023年第4期33卷 1189-1216页

作者： Luyu Cen wei hu Dong Wang Xiaoping Wang Department of Mathematics Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina The Program in Applied and Computational Mathematics Princeton UniversityPrincetonNew JerseyUSA School of Science and Engineering The Chinese University of Hong KongShenzhenGuangdong 518172China Shenzhen International Center for Industrial and Applied Mathematics Shenzhen Research Institute of Big DataGuangdong 518172China

In this paper,we propose a simple energy decaying iterative thresholding algorithm to solve the two-phase minimum compliance *** material domain is implicitly represented by its characteristic function,and the problem is formulated into a minimization problem by the principle of minimum complementary *** prove that the energy is decreasing in each *** effective continuation schemes are proposed to avoid trapping into the local *** results on 2D isotropic linear material demonstrate the effectiveness of the proposed methods.

关键词： Minimum compliance convolution thresholding linear elasticity

Ultrafine particle emission characteristics of diesel engine by on-board and test bench measurement

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Journal of Environmental Sciences 2012年第11期24卷 1972-1978页

作者： Cheng huang Diming Lou Zhiyuan hu Piqiang Tai Di Yao wei hu Peng Li Jin Ren Changhong Chen School of Automobile Studies Tongji UniversityShanghai 201804China Shanghai Academy of Environmental Sciences Shanghai 200233China

This study investigated the emission characteristics of *** particles based on test bench and on-board measurements. The bench test results showed the ultrafine particle number concentration of the diesel engine to be in the range of （0.56-8.35）×10^8 cm^-3. The on-board measurement results illustrated that the ultra_fine particles were strongly correlated with changes in real-world driving cycles. The particle number concentration was down to 2.0 ×10^6 cm^-3 and 2.7 ×10^7 cm^-3 under decelerating and idling operations and as high as 5.0×10^8 cm^-3 under accelerating operation. It was also indicated that the particle number measured by the two methods increased with the growth of engine load at each engine speed in both cases. The particle number presented a ＂U＂ shaped distribution with changing speed at high engine load conditions, which implies that the particle number will reach its lowest level at medium engine speeds. The particle sizes of both measurements showed single mode distributions. The peak of particle size was located at about 50-80 nm in the accumulation mode particle range. Nucleation mode particles will significantly increase at low engine load operations like idling and decelerating caused by the high concentration of unburned organic compounds.

关键词： ultrafine particle emission emission factor diesel engine on-board emission measurement TSI EEPS