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| 1 | An improved algorithm for fluid-structure interaction of high-speed trains under crosswind显示文摘Based on the train-track coupling dynamics and high-speed train aerodynamics,this paper deals with an improved algorithm for fluid-structure interaction of high-speed trains.In the algorithm,the data communication between fluid solver and structure solver is avoided by inserting the program of train-track coupling dynamics into fluid dynamics program,and the relaxation factor concerning the load boundary of the fluid-structure interface is introduced to improve the fluctuation and convergence of aerodynamic forces.With this method,the fluid-structure dynamics of a highspeed train are simulated under the condition that the velocity of crosswind is 13.8 m/s and the train speed is 350 km/h.When the relaxation factor equals 0.5,the fluctuation of aerodynamic forces is lower and its convergence is faster than in other cases.The side force and lateral displacement of the head train are compared between off-line simulation and co-simulation.Simulation results show that the fluid-structure interaction has a significant influence on the aerodynamics and attitude of the head train under crosswind conditions.In addition,the security indexes of the head train worsen after the fluid-structure interaction calculation.Therefore,the fluid-structure interaction calculation is necessary for high-speed trains. | Tian LI Jiye ZHANG Weihua ZHANG | 2011 | Journal of Modern Transportation2011，19，2： | 29 |
| 2 | Trajectory planning and yaw rate tracking control for lane changing of intelligent vehicle on curved road显示文摘The lateral control for lane changing of intelligent vehicle on curved road in automatic highway systems was studied. Based on trapezoidal acceleration profile, considering the curvature difference between starting lane and target lane, a new virtual trajectory planning method for lane changing on curved road was presented, and the calculating formulas for ideal states of vehicle in the inertial coordinate system during a lane changing maneuver were established. Applying the predetermined trajectory, the reference yaw angle and yaw rate for lane changing were generated. On the assumption that the information on yaw rate of vehicle can be measured with on-board sensors and based on the lateral dynamical model of vehicle, the yaw-rate-tracking control law was designed by applying nonsingular terminal sliding mode technology. Based on Lyapunov function method, the finite-time convergence property of the system was obtained from the phase-plane analysis. Simulation results showed that if the curvature difference between starting lane and target lane was not considered, then at the finishing time of lane changing, it was impossible to avoid the deviation of the virtual trajectory panned from the target lane, which increased with the decrease of curvature radius. With the trajectory planning method and yaw rate-tracking control law proposed in this paper and considering the curvature difference between the starting lane and target lane, the desired virtual trajectory for lane changing without deviation was obtained and the expected tracking performance was also verified by the simulation. | REN DianBo ZHANG JiYe ZHANG JingMing CUI ShengMin | 2011 | Science China(Technological Sciences)2011，54，3： | 25 |
| 3 | Investigation of the aeroacoustic behavior and aerodynamic noise of a high-speed train pantograph显示文摘As one of the main aerodynamic noise sources of high-speed trains, the pantograph is a complex structure containing many components, and the flow around it is extremely dynamic, with high-level turbulence. This study analyzed the near-field unsteady flow around a pantograph using a large-eddy simulation(LES) with high-order finite difference schemes. The far-field aerodynamic noise from a pantograph was predicted using a computational fluid dynamics(CFD)/Ffowcs Williams-Hawkings(FW-H) acoustic analogy. The surface oscillating pressure data were also used in a boundary element method(BEM) acoustic analysis to predict the aerodynamic noise sources of a pantograph and the far-field sound radiation. The results indicated that the main aerodynamic noise sources of the pantograph were the panhead, base frame and knuckle. The panhead had the largest contribution to the far-field aerodynamic noise of the pantograph. The vortex shedding from the panhead generated tonal noise with the dominant peak corresponding to the vortex shedding frequency and the oscillating lift force exerted back on the fluid around the panhead.Additionally, the peak at the second harmonic frequency was associated with the oscillating drag force. The contribution of the knuckle-downstream direction to the pantograph aerodynamic noise was less than that of the knuckle-upstream direction of the pantograph, and the average sound pressure level(SPL) was 3.4 dBA. The directivity of the noise radiated exhibited a typical dipole pattern in which the noise directivity was obvious at the horizontal plane of θ=0°,the longitudinal plane of θ=120°,and the vertical plane of θ=90°. | ZHANG YaDong ZHANG JiYe LI Tian ZHANG Liang | 2017 | Science China(Technological Sciences)2017，60，4： | 25 |
| 4 | Cucurbitacin B induces rapid depletion of the G-actin pool through reactive oxygen species-dependent actin aggregation in melanoma cells显示文摘Cucurbitacin B (崽) ,从 Cucurbitaceae 植物孤立的 triterpenoid 混合物,作为一个有希望的反癌症代理人被报导了,还它的行动机制仍然是争论的。在这研究,我们在鼠科的 B16F10 黑瘤房间探索了崽的潜在的机制。反增长和反侵略效果在有教养的房间被估计,并且在 vivo 反肿瘤,活动在一个鼠科的下的黑瘤模型被评估。流动 cytometry 被采用分析细胞周期分发和反应的氧种(ROS ) 层次。肌动朊层次被西方的污点分析决定,并且微分表示蛋白质的侧面被一条量的 proteomic 途径识别。结果证明那崽在房间增长,殖民地形成,以及移植和黑瘤房间的侵略潜力上施加了禁止的效果。下的黑瘤的生长显著地在当时,与崽对待的老鼠被禁止与控制相比组。而且,崽治疗引起了快速的房间膜 blebbing 和变丑,并且导致了 G2/M-phase 拘捕和 multiploid 房间的形成。尤其是, G 肌动朊水池很快被弄空,肌动朊总数在崽处理以后快速被形成。很多细胞骨架规章的蛋白质是调整的差别。ROS 生产的阻塞显著地减少了 G 肌动朊弄空能力和崽的反肿瘤活动。这些调查结果显示那崽在黑瘤房间通过 ROS 依赖的肌动朊聚集导致 G 肌动朊水池的快速的弄空,它可以部分至少说明它的反肿瘤活动。 | Yanting Zhang Dongyun Ouyang Lihui Xu Yuhua Ji Qingbing Zha Jiye Cai Xianhui He | 2011 | Acta Biochimica et Biophysica Sinica2011，43，7： | 19 |
| 5 | Effect of RANS Turbulence Model on Aerodynamic Behavior of Trains in Crosswind显示文摘The numerical simulation based on Reynolds time-averaged equation is one of the approved methods to evaluate the aerodynamic performance of trains in crosswind.However,there are several turbulence models,trains may present different aerodynamic performances in crosswind using different turbulence models.In order to select the most suitable turbulence model,the inter-city express 2(ICE2)model is chosen as a research object,6 different turbulence models are used to simulate the flow characteristics,surface pressure and aerodynamic forces of the train in crosswind,respectively.6 turbulence models are the standard k-ε,Renormalization Group(RNG)k-ε,Realizable k-ε,Shear Stress Transport(SST)k-ω,standard k-ωand Spalart-Allmaras(SPA),respectively.The numerical results and the wind tunnel experimental data are compared.The results show that the most accurate model for predicting the surface pressure of the train is SST k-ω,followed by Realizable k-ε.Compared with the experimental result,the error of the side force coefficient obtained by SST k-ωand Realizable k-εturbulence model is less than 1%.The most accurate prediction for the lift force coefficient is achieved by SST k-ω,followed by RNG k-ε.By comparing 6 different turbulence models,the SST k-ωmodel is most suitable for the numerical simulation of the aerodynamic behavior of trains in crosswind. | Tian Li Deng Qin Jiye Zhang | 2019 | Chinese Journal of Mechanical Engineering2019，32，5： | 13 |
| 6 | Outline of Uranium Resources Characteristics and Metallogenetic Regularity in China显示文摘Uranium,as one of twenty-six kinds of important minerals in China,is strategic resource and energy mineral,which has been thoroughly investigated in the project of National Potential Evaluation of Uranium Resource.During the implementation of this project,the authors summarized the metallogenic regularity of uranium resource in China systematically,through the researches of geological characteristics of uranium resource,uranium deposits type(genetic and prediction type),temporal and spatial distribution,and metallogenic series.Based on the investigation of present situation and progress in uranium exploration,this paper proposes the uranium deposits in China should be divided into 4 classes,9 types,21 subtypes in genetic,and 50 types in prediction;suggests to divide China into 29 uranium metallogenic belts and 20 uranium prospective area,and constructs 20uranium-polymetallic metallogenic series,through summarizing temporal and spatial distribution characteristics and metallogenic regularity of uranium deposits in China.The above research is beneficial to the comprehensive understanding of regional uranium metallogenic regularity,and will direct the uranium exploration in the future. | CAI Yuqi ZHANG Jindai LI Ziying GUO Qingyin SONG Jiye FAN Honghai LIU Wusheng QI Fucheng ZHANG Minglin | 2015 | Acta Geologica Sinica(English Edition)2015，89，3： | 11 |
| 7 | Research progress in ZnO single-crystal:growth, scientific understanding, and device applications显示文摘Zinc oxide,a wide band-gap semiconductor,has shown extensive potential applications in high-efficiency semiconductor photoelectronic devices,semiconductor photocatalysis,and diluted magnetic semiconductors.Due to the undisputed lattice integrity,ZnO single crystals are essential for the fabrication of high-quality ZnO-based photoelectronic devices,and also believed to be ideal research subjects for understanding the underlying mechanisms of semiconductor photocatalysis and diluted magnetic semiconductors.This review,which is organized in two main parts,introduces the recent progress in growth,basic characterization,and device development of ZnO single crystals,and some related works in our group.The first part begins from the growth of ZnO single crystal,and summarizes the fundamental and applied investigations based on ZnO single crystals.These works are composed of the fabrication of homoepitaxial ZnO-based photoelectronic devices,the research on the photocatalysis mechanism,and dilute magnetic mechanism.The second part describes the fabrication of highly thermostable n-type ZnO with high mobility and high electron concentration through intentional doping.More importantly,in this part,a conceptual approach for fabricating highly thermostable p-type ZnO materials with high mobility through an integrated three-step treatment is proposed on the basis of the preliminary research. | Feng Huang Zhang Lin Wenwen Lin Jiye Zhang Kai Ding Yonghao Wang Qinghong Zheng Zhibing Zhan Fengbo Yan Dagui Chen Peiwen Lv Xian Wang | 2014 | Chinese Science Bulletin2014，59，12： | 11 |
| 8 | Poly(methyl methacrylate) bone cement composited with mineralized collagen for osteoporotic vertebral compression fractures in extremely old patients显示文摘To examine the clinical effects of a new bone cement composed of poly(methyl methacrylate)(PMMA)and mineralized collagen(MC)compared with pure PMMA bone cement in treating osteoporotic vertebral compression fractures(OVCFs)in patients aged over 80.In all,32 cases using pure PMMA bone cement and 31 cases using MC-modified PMMA(MC-PMMA)bone cement for OVCFs between June 2014 and March 2016 were screened as PMMA group and MC-PMMA group,respectively,with an average age of over 80.The operation duration,intraoperative blood loss,hospital stay,oswestry disability index(ODI),visual analogue scale(VAS),anterior vertebral height(AVH),intermediate vertebral height(IVH)and posterior vertebral height(PVH)of injured vertebrae,vertebral computed tomography value,re-fracture rate of adjacent vertebrae,correction rate of spinal kyphotic angle and wedge-shaped vertebra angle and surgical complications were compared between the two groups.In the early post-operative period,the VAS,ODI,AVH and IVH in MC-PMMA group were comparable to those in the traditional PMMA group.Moreover,the MC-PMMA group showed better effects compared with the PMMA group 12months after surgery.Thus,this new bone cement has superior clinic effects in the long term. | Kefeng Luo Guoqiang Jiang Jinjin Zhu Bin Lu Jiye Lu Kai Zhang Xiumei Wang Fu-Zhai Cui | 2020 | Regenerative Biomaterials2020，7，1： | 8 |
| 9 | Aerodynamic performances and vehicle dynamic response of high-speed trains passing each other显示文摘Based on the aerodynamics and vehicle dynamics,the aerodynamic performances and vehicle dynamic characteristics of two high-speed trains passing each other on the ground,embankment and bridge are studied.Firstly,a train aerodynamic model and a vehicle dynamic model are established.Through the simulation of the two models,the pressure waves,aerodynamic forces,and vehicle dynamic responses are obtained.Then,the pressure waves and aerodynamic forces on different foundations are compared.The results show that the variation trends of pressure wave and aerodynamic forces of trains passing each other on different foundations are almost similar.The peak-to-peak differences in pressure wave and aerodynamic force are below 4% and 3% in three cases in open air.Besides,the differences of security indexes,including coefficient of derailment,wheel unloading rate,the wheelset lateral force,and the wheelrail vertical force,are below 2% among the three cases;the differences of comfort indexes,including the lateral acceleration and the vertical acceleration,are also below 2%.It is concluded that the dynamic performances of trains passing each other are influenced little by different foundations in open air. | Yinghui ZHAO Jiye ZHANG Tian LI Weihua ZHANG | 2012 | Journal of Modern Transportation2012，20，1： | 7 |
| 10 | Crosswind Stability Evaluation of High-Speed Train Using Different Wind Models显示文摘Different wind models are being used for the operational safety evaluation of a high-speed train exposed to crosswinds. However, the methodology for simulating natural wind is of substantial importance in the wind-train system, and different simplified forms of natural wind result in different levels of accuracy. The purpose of the research in this paper is to investigate the effects of different wind models on the operational safety evaluation of high-speed trains. First, three wind models, namely, steady wind model, gust wind model, and turbulent wind model, are constructed. Following this, the algorithms for computing the aerodynamic loads using the wind models are described. A multi-body dynamic model of a vehicle is then set up using the commercial software 'Simpack' for investigating the dynamic behavior of a railway vehicle exposed to wind loads. The rollover risks corresponding to each wind model are evaluated by applying the definition of characteristic wind curves (CWC). The results indicate that the CWC computed using the gust wind model is marginally higher than that computed using the turbulent wind model;the difference is less than 1%. With regard to the steady wind model, the assurance coefficient substantially affects the final CWC. A reasonable agreement of CWC between the steady wind model and turbulent wind model can be obtained by applying an 'appropriate value' of the assurance coefficient. This study included a systematic analysis of the operational safety evaluation results using different wind models;the analysis can serve as a reference basis for different engineering accuracy requirements. | Mengge Yu Rongchao Jiang Qian Zhang Jiye Zhang | 2019 | Chinese Journal of Mechanical Engineering2019，32，3： | 7 |
| 11 | Numerical Study on Aerodynamic Performance of High-Speed Pantograph with Double Strips显示文摘Pantograph is a critical component of the high-speed train.It collects power through contact with catenary,which significantly affects the running safety of the train.Pantograph with double collector strips is one common type.The aerodynamic performance of the collector strips may affect the current collection of the pantograph.In this study,the aerodynamic performance of the pantograph with double strips is investigated.The numerical results are consistent with the experimental ones.The error in the aerodynamic drag force of the pantograph between numerical and experimental results is less than 5%.Three different conditions of the strips are studied,including the front strip,the rear strip,and the double strips.Results show that the presence of the front strip will affect the lift force of the rear strip,and reduce the resistance of the rear strip under the opening condition.Meanwhile,the rear strip has few effects on the front strip under the opening operation condition.The law of the resistance for the interaction between two strips under the closing condition is similar to the opening one. | Zhiyuan Dai Tian Li Weihua Zhang Jiye Zhang | 2020 | Fluid Dynamics & Materials Processing2020，16，1： | 5 |
| 12 | Influence of pantograph fixing position on aerodynamic characteristics of high-speed trains显示文摘To study the influence of the pantograph fixing position on aerodynamic characteristics of high-speed trains, the aerodynamic models of high-speed trains with eight cars were established based on the theory of computational fluid dynamics, and eight cases with pantographs fixed on different positions and in different operational orientations were considered. The pantographs were fixed on the front or the rear end of the first middle car or fixed on the front or the rear end of the last middle car. The external flow fields of the high-speed trains were numerically simulated using the software STAR-CCM+. The results show that the pantograph fixing position has little effect on the aerodynamic drag force of the head car and has a large effect on the aerodynamic drag force of the tail car. The influences of the pantograph fixing position on the aerodynamic lift forces of the head car, tail car and pantographs are obvious. Among the eight cases, considering the total aerodynamic drag force of the train and the aerodynamic lift force of the lifted pantograph, when the pantographs are fixed on the rear end of the last middle car and the lifted pantograph is in the knuckle-upstream orientation, the aerodynamic performance of the high-speed train is the best. | Liang Zhang Jiye Zhang Tian Li Weihua Zhang | 2017 | Journal of Modern Transportation2017，25，1： | 5 |
| 13 | Alterations in gut microbiota and metabolites associated with altitude-induced cardiac hypertrophy in rats during hypobaric hypoxia challenge显示文摘The gut microbiota is involved in host responses to high altitude.However,the dynamics of intestinal microecology and their association with altitude-related illness are poorly understood.Here,we used a rat model of hypobaric hypoxia challenge to mimic plateau exposure and monitored the gut microbiome,short-chain fatty acids(SCFAs),and bile acids(BAs)over 28 d.We identified weight loss,polycythemia,and pathological cardiac hypertrophy in hypoxic rats,accompanied by a large compositional shift in the gut microbiota,which is mainly driven by the bacterial families of Prevotellaceae,Porphyromonadaceae,and Streptococcaceae.The aberrant gut microbiota was characterized by increased abundance of the Parabacteroides,Alistipes,and Lactococcus genera and a larger Bacteroides to Prevotella ratio.Trans-omics analyses showed that the gut microbiome was significantly correlated with the metabolic abnormalities of SCFAs and BAs in feces,suggesting an interaction network remodeling of the microbiome-metabolome after the hypobaric hypoxia challenge.Interestingly,the transplantation of fecal microbiota significantly increased the diversity of the gut microbiota,partially inhibited the increased abundance of the Bacteroides and Alistipes genera,restored the decrease of plasma propionate,and moderately ameliorated cardiac hypertrophy in hypoxic rats.Our results provide an insight into the longitudinal changes in intestinal microecology during the hypobaric hypoxia challenge.Abnormalities in the gut microbiota and microbial metabolites contribute to the development of high-altitude heart disease in rats. | Zhiyuan Pan Yichen Hu Zongyu Huang Ni Han Yan Li Xiaomei Zhuang Jiye Yin Hui Peng Quansheng Gao Wenpeng Zhang Yong Huang Yujun Cui Yujing Bi Zhenjiang Zech Xu Ruifu Yang | 2022 | Science China(Life Sciences)2022，65，10： | 5 |
| 14 | Association of TNF-α promoter polymorphisms with the outcome of persistent HBV infection in a northeast Chinese Han population显示文摘肿瘤坏死因素 --(TNF-) 在致病和长期的肝炎 B 的临床的结果起一个重要作用病毒(HBV ) 感染。这研究的目的是在一张东北汉语汉人口评估在 TNF- 的功能的多型性和坚持的 HBV 感染的不同结果之间的关系。这里, 189 HBV 自发地恢复了题目(SR ) ,包括 180 长期的肝炎 B (CHB ) 的 571 个感染 HBV 的病人, 196 肝肝硬化(LC ) ,和 195 hepatocellular 癌(HCC ) 个人在这研究被注册。所有样品用聚合酶链反应限制碎片长度多型性方法是为 TNF- 857C/T 和 863C/A 的 genotyped。857CC 遗传型的频率与 SR 题目的相比在 CHB 和 LC 个人是显著地更高的(P= 0.03,或 = 1.57, 95% CI 1.042.39 和 P= 0.03,或 = 1.57, 95% CI 1.042.35,分别地) 。在等位基因 857C 的分发的重要差别为 CHB 对 SR 被观察(P= 0.01,或 = 1.52, 95% CI 1.082.13 ) 并且 LC 对 SR (P= 0.02,或 = 1.47, 95% CI 1.062.04 ) 队。另外, 863AA 遗传型的频率比 SR 题目的在 CHB 和 LC 病人是显著地更高的( P= 0.01 ,或= 3.90 ,95% CI 1.3511.23 和 P= 0.01 ,或= 3.83 ,95% CI 1.3410.96 ,分别地),并且等位基因 863A 频率是显著地在比 SR 控制的 CHB , LC ,和 HCC 队更普通( P= 0.004 ,或= 1.72 ,95% CI 1.192.50 ;P= 0.001,或 = 1.81, 95% CI 1.262.61 和 P= 0.001,或 = 1.90, 95% CI 1.332.73,分别地) 。我们的数据也表明 haplotype CA 强烈与坚持的 HBV 感染被联系。这些结果在学习人口建议在 TNF- 倡导者变体和坚持的 HBV 感染的不同结果之间的一个协会。 | Bing Qiui Xi Wang Peiyi Zhang Chunlin Shi Jiye Zhang Wenliang Qiu Wenduo Wang Dongfu Li | 2012 | Acta Biochimica et Biophysica Sinica2012，44，8： | 4 |
| 15 | Postoperative Complications and Survival Analysis of Surgical Resection for Hilar Cholangiocarcinoma:A Retrospective Study of Fifty-Nine Consecutive Patients显示文摘Objective Hilar cholangiocarcinoma(HC)is invariably fatal without surgical resection.The primary aim of the current study was to determine the safety of variable surgical resections for patient with HC and their survival after surgical resection.In addition,prognostic factor for the overall survival was also evaluated.Methods The study included 59 consecutive patients who were newly diagnosed with HC and underwent surgical resections with curative intend between February 2009 and February 2017.Patients were followed up at 3-6 months intervals after hospital discharge.Postoperative complications and overall survival were determined.Associations of clinicopathologic and surgeon-related factors with overall survival were evaluated through univariate analysis and Cox regression analysis.Results Of patients with Bismuth and Corlette(B&C)type HI(n=19)and IV(n=25)HC lesions,33(55.9%)were treated with hilar resection combined with major liver resection(MLR),while the other 11 patients with type HI and IV,and those with type I(n=8)and II(n=7)HC lesions were treated with hilar resection.The overall surgical mortality was 5.1%and surgical morbidity was 35.6%.There was no statistical difference in the mortality between MLR group and hilar resection group(6.1%vs.3.8%;X2=0.703,P=0.145).The median follow-up period was 18 months(range,1-94 months).The 1-,3-,5-year survival rate was 59.3%,36.5%,and 17.7%,respectively.The overall survival after resections was 18 months.In HC patients with B&C type III and IV lesions,the median survival was 23 months for hilar resection with MLR and 8 months for hilar resection alone;the 1-,3-,5-year cumulative survival rate was 63.9%,23.3%,and 15.5%,respectively for hilar resection with MLR,and 11.1%,0,and 0,respectively for hilar resection alone,with significant diflerene observed(HR,9.902;95%CI,2.636-19.571,P=0.001).Four factors were independently associated with overall survival:preoperative serum Cal9-9(HR,7.039;95%CI,2.803-17.678,P<0.001),histopathologic grade(HR,4.964;95%CI,1.046-23.552,?=0.044),surgical margins(P=0.031),andAJCC staging(P=0.015).Conclusions R0 resection is efficacious in surgical treatment of HC.MLR in combination with caudate lobe resection may increase the chance of R0 resection and improve survival of HC patients with B&C type IK and IV lesions.Preoperatively prepared for biliary drainage may ensure the safety of MLR in most HC patients.Novel adjuvant therapies are needed to improve the survival of HC patients with poor prognostic factors. | Weihua Zhu Wenyong Xie Zhedong Zhang Shu Li Dafang Zhang Yijun Liu Jiye Zhu Xisheng Leng | 2020 | Chinese Medical Sciences Journal2020，35，2： | 4 |
| 16 | Optimization on the Crosswind Stability of Trains Using Neural Network Surrogate Model显示文摘Under the influence of crosswinds,the running safety of trains will decrease sharply,so it is necessary to optimize the suspension parameters of trains.This paper studies the dynamic performance of high-speed trains under cross-wind conditions,and optimizes the running safety of train.A computational fluid dynamics simulation was used to determine the aerodynamic loads and moments experienced by a train.A series of dynamic models of a train,with different dynamic parameters were constructed,and analyzed,with safety metrics for these being determined.Finally,a surrogate model was built and an optimization algorithm was used upon this surrogate model,to find the minimum possible values for:derailment coefficient,vertical wheel-rail contact force,wheel load reduction ratio,wheel lateral force and overturning coefficient.There were 9 design variables,all associated with the dynamic parameters of the bogie.When the train was running with the speed of 350 km/h,under a crosswind speed of 15 m/s,the benchmark dynamic model performed poorly.The derailment coefficient was 1.31.The vertical wheel-rail contact force was 133.30 kN.The wheel load reduction rate was 0.643.The wheel lateral force was 85.67 kN,and the overturning coefficient was 0.425.After optimization,under the same running conditions,the metrics of the train were 0.268,100.44 kN,0.474,34.36 kN,and 0.421,respectively.This paper show that by combining train aerodynamics,vehicle system dynamics and many-objective optimization theory,a train’s stability can be more comprehensively analyzed,with more safety metrics being considered. | Le Zhang Tian Li Jiye Zhang Ronghuan Piao | 2021 | Chinese Journal of Mechanical Engineering2021，34，4： | 4 |
| 17 | High Thermoelectric Performance of Cu-Doped PbSe-PbS System Enabled by High-Throughput Experimental Screening显示文摘Recent advances in high-throughput(HTP)computational power and machine learning have led to great achievements in exploration of new thermoelectric materials.However,experimental discovery and optimization of thermoelectric materials have long relied on the traditional Edisonian trial and error approach.Herein,we demonstrate that ultrahigh thermoelectric performance in a Cu-doped PbSe-PbS system can be realized by HTP experimental screening and precise property modulation.Combining the HTP experimental technique with transport model analysis,an optimal Se/S ratio showing high thermoelectric performance has been efficiently screened out.Subsequently,based on the screened Se/S ratio,the doping content of Cu has been subtly adjusted to reach the optimum carrier concentration.As a result,an outstanding peak zT~1:6 is achieved at 873 K for a 1.8 at%Cu-doped PbSe_(0.6)S_(0.4) sample,which is the superior value among the n-type Te-free lead chalcogenides.We anticipate that current work will stimulate large-scale unitization of the HTP experimental technique in the thermoelectric field,which can greatly accelerate the research and development of new high-performance thermoelectric materials. | Li You Zhili Li Quanying Ma Shiyang He Qidong Zhang Feng Wang Guoqiang Wu Qingyi Li Pengfei Luo Jiye Zhang Jun Luo | 2020 | Research2020，，1： | 4 |
| 18 | Understanding the forces acting in self-assembly and the implications for constructing three-dimensional (3D) supercrystals显示文摘进称为 supercrystals 或上层建筑的订的结构的 nanocrystals 的集会由于象相关那样的众多的有用应用成为了枢轴的边疆在宏观的晶体的原子的安排并且调节集体性质遇见各种各样的应用的要求。在这篇文章,在 nanocrystals 的三维的超点阵的准备的最近的进步被构画出,与在有序的汇编以外的驱动力和进化线路上的一个特别重音。首先,带或内部并且外部地管理三维的 supercrystals 的形成的斥力系统地在三维的组织工会关于他们的起源和功能被识别并且讨论。然后,基于象微滴蒸发和一个液体 / 液体接口那样的生长情形自己组装的 nanocrystal 的通常应用的工具的摘要的介绍与特定的盒子被介绍并且详细说明了分析。最后,为这块地的存在挑战和前景简短被加亮。 | Chenyu wang1 Carrie Siu Jun Zhang Jiye Fang | 2015 | Nano Research2015，8，8： | 3 |
| 19 | Numerical Simulation of the Aeroacoustic Performance of the DSA380 High-Speed Pantograph Under the Influence of a Crosswind显示文摘The object of research of this paper is the DSA380 high-speed pantograph.The near-field unsteady flow around the pantograph was investigated using large eddy simulation(LES)while the far-field aerodynamic noise was analysed in the frame of the Ffowcs Williams-Hawkings(FW-H)acoustic analogy.According to the results,the contact strip,base frame and knuckle are the main aerodynamic noise sources,with vortex shedding,flow separation and recombination around the pantograph being related key physical factors.The aerodynamic noise radiates outwards in the form of spherical waves when the distance of the noise receiving point is farther than 8 m.The sound pressure level(SPL)grows approximately as the 6th power of pantograph operating speed.The aerodynamic noise energy is mainly concentrated in the region of 400-1000 Hz,and the frequency band is wider with crosswind than without crosswind.The peak frequency displays a linear relationships with the operating speed and crosswind velocity,respectively.The aerodynamic and aeroacoustic generation from the knuckle-downstream orientation of the pantograph is superior to those of the knuckle-upstream orientation model.This finding may be used for the optimal design of future pantograph configurations in the presence of crosswind. | Yadong Zhang Jiye Zhang | 2020 | Fluid Dynamics & Materials Processing2020，16，1： | 3 |
| 20 | Numerical simulation and optimization of aerodynamic uplift force of a high-speed pantograph显示文摘Aiming at the problem that aerodynamic uplift forces of the pantograph running in the knuckle-downstream and knuckle-upstream conditions are inconsistent,and their magnitudes do not satisfy the corresponding standard, the aerodynamic uplift forces of pantographs with baffles are numerically investigated, and an optimization method to determine the baffle angle is proposed. First, the error between the aerodynamic resistances of the pantograph obtained by numerical simulation and wind tunnel test is less than 5%, which indicates the accuracy of the numerical simulation method. Second, the original pantograph and pantographs equipped with three different baffles are numerically simulated to obtain the aerodynamic forces and moments of the pantograph components.Three different angles for the baffles are-17°, 0° and 17°.Then the multibody simulation is used to calculate the aerodynamic uplift force of the pantograph, and the optimal range for the baffle angle is determined. Results show that the lift force of the baffle increases with the increment of the angle in the knuckle-downstream condition, whereas the lift force of the baffle decreases with the increment of the angle in the knuckle-upstream condition. According to the results of the aerodynamic uplift force, the optimal angle of the baffle is determined to be 4.75° when the running speed is 350 km/h, and pantograph–catenary contact forces are 128.89 N and 129.15 N under the knuckledownstream and knuckle-upstream operating conditions,respectively, which are almost equal and both meet the requirements of the standard EN50367:2012. | Zhiyuan Dai Tian Li Ning Zhou Jiye Zhang Weihua Zhang | 2022 | Railway Engineering Science2022，30，1： | 3 |
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