|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Prediction of urban human mobility using large-scale taxi traces and its applications显示文摘这篇论文在一个城市的出租车交通系统调查人的活动性模式。这个工作集中于预言 humanmobility fromdiscovering 模式在从城市的热点的旅客提取数量(PUQ ) 的数字。这份报纸建议改进 ARIMA 基于预言方法在一个热点预报旅客的空间时间的变化。有 4 000 出租车 GPS 的一个大规模 realworld 数据集合的评估跟踪超过一年表演一个预言错误仅仅 5.8% 。我们也探索预言途径的申请帮助司机发现他们的下位旅客。用历史的真实世界的数据的模拟结果证明与我们的指导,驱动程序能减少花的时间,距离旅行,到发现他们的下位旅客在 37.1% 和 6.4% ,分别地。 | Xiaolong LI Gang PAN Zhaohui WU Guande QI Shijian LI Daqing ZHANG Wangsheng ZHANG Zonghui WANG | 2012 | Frontiers of Computer Science2012，6，1： | 45 |
| 2 | A promising new class of irradiation tolerant materials:Ti_2ZrHfV_(0.5)Mo_(0.2) high-entropy alloy显示文摘Recently, high-entropy alloys(HEAs) or multi-principal-element alloys with unprecedented physical,chemical, and mechanical properties, have been considered as candidate materials used in advanced reactors due to their promising irradiation resistant behavior. Here, we report a new single-phase bodycentered cubic(BCC) structured Ti_2 ZrHfV_(0.5)Mo_(0.2) HEA possessing excellent irradiation resistance, i.e.,scarcely irradiation hardening and abnormal lattice constant reduction after helium-ion irradiation,which is completely different from conventional alloys. This is the first time to report the abnormal XRD phenomenon of metallic alloys and almost no hardening after irradiation. These excellent properties make it to be a potential candidate material used as core components in next-generation nuclear reactors. The particular irradiation tolerance derives from high density lattice vacancies/defects. | Yiping Lu Hefei Huang Xuzhou Gao Cuilan Ren Jie Gao Huanzhi Zhang Shijian Zheng Qianqian Jin Yonghao Zhao Chenyang Lu Tongmin Wang Tingju Li | 2019 | Journal of Materials Science & Technology2019，35，3： | 23 |
| 3 | 关于6A02铝合金板热成型-整体淬火工艺的实验研究显示文摘作为重要的轻质结构材料,铝合金已广泛用于汽车和航空工业。主要用来制造具有高强度,精确尺寸的零件。本文中开发了一种特殊装置,用来研究冷轧6A02铝合金板热成型-整体淬火工艺。用测维氏硬度和拉伸试验来反映强化效果。用扫描电镜(SEM)透射电镜(TEM)、和电子背散射衍射进行显微检测来阐明强化机理。结果表明,随着固溶时间(<50 min)延长维氏硬度增大,强化效应越大。成型零件的维氏硬度能从冷轧态的73 HV或热成型-整体淬火工艺(在520℃固溶50 min,以50°C/s冷却,以160°C/10 h时效)加热后的40 HV增加到106.5 HV。相应的拉伸强度和屈服强度分别是315.6 MPa和253.6 MPa。强化相是未成形的弥散的GP区,约5 nm大小。轧制态的可热处理的铝合金板通常直接用热成型-整体淬火工艺不作任何前处理。 | Fan Xiaobo He Zhubin Yuan Shijian Zheng Kailun | 2013 | 热处理技术与装备2013，34，6： | 19 |
| 4 | Developments and perspectives on the precision forming processes for ultra-large size integrated components显示文摘In order to meet the requirements of high reliability,long-lifetime and lightweight in a new generation of aerospace,aviation,high-speed train,and energy power equipment,integrated components are urgently needed to replace traditional multi-piece,welded components.The applications of integrated components involve in a series of large-size,complex-shaped,highperformance components made of difficult-to-deform materials,which present a huge challenge for forming ultra-large size integrated components.In this paper,the developments and perspectives of several extreme forming technologies are reviewed,including the sheet hydroforming of ultra-large curved components,dieless hydroforming of ellipsoidal shells,radial-axial ring rolling of rings,in situ manufacturing process of flanges,and local isothermal forging of titanium alloy components.The principle and processes for controlling deformation are briefly illustrated.The forming of typical ultra-large size integrated components and industrial applications are introduced,such as the high strength aluminum alloy,3m in diameter,integrated tank dome first formed by using a sheet blank with a thickness the same as the final component,and a 16m diameter,integrated steel ring rolled by using a single billet.The trends for extreme forming of ultra-large size integrated components are discussed with a goal of providing ideas and fundamental guidance for the further development of new forming processes for extreme-size integrated components in the future. | Shijian Yuan Xiaobo Fan | 2019 | International Journal of Extreme Manufacturing2019，1，2： | 12 |
| 5 | Fundamentals and Processes of Fluid Pressure Forming Technology for Complex Thin-Walled Components显示文摘A new generation of fluid pressure forming technology has been developed for the three typical structures of tubes,sheets,and shells,and hard-to-deform material components that are urgently needed for aerospace,aircraft,automobile,and high-speed train industries.in this paper,an over all review is introduced on the state of the art in fundamentals and processes for lower-pressure hydroforming of tubular components,double-sided pressure hydroforming of sheet components,die-less hydroforming of ellipsoidai shells,and dual hardening hot medium forming af hard-to-deform materiais Particular attention is paid to deformation behavior,stress state adjustment,defect prevention,and typical applications.In addition,future development directions of fluid pressure forming technology are discussed,including hyper lower-loading forming for ultra-large non-uniform components,precision for ming for intermetallic compound and high-entropy alloy components,intelligent process and equipment,and precise finite element simulation of inhomogeneous and strong anisotropic thin shells. | Shijian Yuan | 2021 | Engineering2021，7，3： | 11 |
| 6 | Effect of Strontium Addition to Platinum Catalyst for Propane Dehydrogenation显示文摘PtSnSr/HZSM-5 catalysts with different amounts of strontium were prepared by sequential impregnation method,and characterized by BET analysis,TEM,NH3-TPD,H2-TPR,TPO and TG techniques.The results showed that the addition of strontium could modify the characteristics and properties of both acid function and metal function of Pt-Sn-based catalysts.In this case,PtSnSr/HZSM-5 catalyst with an appropriate amount of Sr(1.2%) showed higher catalytic activity and lower amount of coke deposits than PtSn/HZSM-5 catalyst.However,excessive loading of Sr could facilitate the reduction of Sn,which was unfavorable to the reaction.Afterwards,1.0 m% of Na was added into the PtSnSr(1.2%)/HZSM-5 catalyst to improve the catalytic performance in propane dehydrogenation,and this catalyst displayed the best catalytic performance during our experiments.After having been subjected to reaction for 5h,the PtSnNa(1.0%)Sr(1.2%)/HZSM-5 catalyst had achieved a higher than 95% selectivity towards propene along with a corresponding propane conversion rate of 32.2%. | Huang Li Zhou Shijian Zhou Yuming Zhang Yiwei Zhang Shaobo Xu Jun | 2012 | China Petroleum Processing & Petrochemical Technology2012，14，3： | 11 |
| 7 | Effects of smartphone icon background shapes and figure/background area ratios on visual search performance and user preferences显示文摘 | Shijian LUO Yuxiao ZHOU | 2015 | Frontiers of Computer Science2015，9，5： | 10 |
| 8 | High-efficiency forming processes for complex thin-walled titanium alloys components: state-of-the-art and perspectives显示文摘Complex thin-walled titanium alloy components play a key role in the aircraft,aerospace and marine industries,offering the advantages of reduced weight and increased thermal resistance.The geometrical complexity,dimensional accuracy and in-service properties are essential to fulfill the high-performance standards required in new transportation systems,which brings new challenges to titanium alloy forming technologies.Traditional forming processes,such as superplastic forming or hot pressing,cannot meet all demands of modern applications due to their limited properties,low productivity and high cost.This has encouraged industry and research groups to develop novel high-efficiency forming processes.Hot gas pressure forming and hot stamping-quenching technologies have been developed for the manufacture of tubular and panel components,and are believed to be the cut-edge processes guaranteeing dimensional accuracy,microstructure and mechanical properties.This article intends to provide a critical review of high-efficiency titanium alloy forming processes,concentrating on latest investigations of controlling dimensional accuracy,microstructure and properties.The advantages and limitations of individual forming process are comprehensively analyzed,through which,future research trends of high-efficiency forming are identified including trends in process integration,processing window design,full cycle and multi-objective optimization.This review aims to provide a guide for researchers and process designers on the manufacture of thin-walled titanium alloy components whilst achieving high dimensional accuracy and satisfying performance properties with high efficiency and low cost. | Kehuan Wang Liliang Wang Kailun Zheng Zhubin He Denis J Politis Gang Liu Shijian Yuan | 2020 | International Journal of Extreme Manufacturing2020，2，3： | 10 |
| 9 | Effects of Loading Paths on Hydrodynamic Deep Drawing with Independent Radial Hydraulic Pressure of Aluminum Alloy Based on Numerical Simulation显示文摘为了为低粘性材料和大高度直径比率遇见形成的要求,分开,有独立光线的水力的压力的深绘画的水动力学(HDD ) 的一个新过程被建议。调查与独立光线的水力的压力在 HDD 上装载路径的效果, 5A06 铝合金的形成的过程有一个半球的底部的圆柱的杯被数字模拟学习。由基于 LS-DYNA3D 采用动态明确的分析软件 ETA/Dynaform,在表厚度分发和表面质量上装载路径的效果被分析。在形成的限制图(FLD ) 上装载路径和部分的种类地位的光线的水力的压力的相应关系也被讨论。结果显示一个声音在液体房间压力之间匹配,独立光线的水力的压力能制止在半球底部的严肃的变瘦并且能通过调整光线的水力的压力减少光线的张力的种类并且改变种类路径。因此,铝的绘画限制有一个半球的底部的圆柱的杯能显著地被增加。 | Xiaojing LIU Yongchao XU Shijian YUAN | 2008 | Journal of Materials Science & Technology2008，24，3： | 10 |
| 10 | Denitrification and phosphorus uptake by DPAOs using nitrite as an electron acceptor by step-feed strategies显示文摘把亚硝酸根用作一个电子领受人的从的磷积累有机体(DPAO ) 能减少更多的精力。然而,亚硝酸根被报导了在从上有抑制磷移动。在这研究,步喂策略被建议完成低亚硝酸根集中,它能避免或减轻亚硝酸根抑制。结果证明那 denitrification 率,磷举起率和到亚硝酸根的磷 uptaken 的比率从(缺氧的 P/N 比率) 当亚硝酸根集中是 15 mg 时。 | Bin MA Shuying WANG Guibing ZHU Shijian GE Junmin WANG Nanqi Ren Yongzhen PENG | 2013 | Frontiers of Environmental Science & Engineering2013，7，2： | 8 |
| 11 | Effect of aluminum modification on catalytic properties of PtSn-based catalysts supported on SBA-15 for propane dehydrogenation显示文摘The catalytic properties of PtSn-based catalysts supported on siliceous SBA-15 and Al-modified SBA-15, such as Al-incorporated SBA-15 (AlSBA-15) and alumina-modified SBA-15 (Al2O3/SBA-15), for propane dehydrogenation were investigated. Al2O3/SBA-15 was prepared either by an impregnation method using aluminum nitrate aqueous solution, or by the treatment of SBA-15 with a Al(OC3H7)3 solution in anhydrous toluene. N2-physisorption, FT-IR spectroscopy, solid-state 27Al MAS NMR spectroscopy, hydrogen chemisorption, XRF, NH3 temperature-programmed desorption, X-ray photoelectron spectroscopy and TPO were used to characterize these samples. Among these catalysts, the PtSn-based catalyst supported on Al2O3/SBA-15, which was grafted with Al(OC3H7)3, exhibited the best catalytic performance in terms of activity and stability The possible reason was due to the high Pt metal dispersion and/or the strong interactions among Pt, Sn, and the support. | Yongzheng Duan Yuming Zhou Yiwei Zhang Xiaoli Sheng Shijian Zhou Zewu Zhang | 2012 | Journal of Natural Gas Chemistry2012，21，2： | 6 |
| 12 | High He-ion irradiation resistance of CrMnFeCoNi high-entropy alloy revealed by comparison study with Ni and 304SS显示文摘High entropy alloys(HEAs) have presented potential applications in nuclear power plants owing to their novel atomic structure based high irradiation resistance. However, understanding of He-ion irradiation of HEAs is still lacking. In this work, we reveal He-ion irradiation resistance of HEA CrMnFeCoNi by comparison study with a pure Ni and a 304 stainless steel(304SS). It is found that the damage structure in the three materials can be characterized with He bubbles and stacking faults/stacking fault tetrahedrons((SFs/SFTs), which show a similar depth distribution after He-ion irradiation at both RT and 450℃.Although the He bubbles have a similar size about 2nm after irradiation at RT, the He bubble sizes of the HEA, 304SS, and Ni increase to 4.0±0.9,5.3±1.0 and 6.7 ±1.0 nm after irradiation at 450℃, respectively. Moreover, the density of SFs/SFTs displays in an order of Ni < 304 SS < HEA at both RT and 450℃.The He-ion irradiation at RT causes significant hardness enhancement for the three materials, however,compared to RT, after irradiation at 450℃, the Ni presents softening, while the 304SS, especially the HEA,shows further hardening. Thus, the HEA CrMnFeCoNi possesses the smallest He bubble size, the densest SFs/SFTs, and the highest hardening, indicating the best structural stability, as well as the best He-ion irradiation resistance, which can be attributed to its low mobility of He atoms and point defects. | Lixin Yang Hualong Ge Jian Zhang Ting Xiong Qianqian Jin Yangtao Zhou Xiaohong Shao Bo Zhang Zhengwang Zhu Shijian Zheng Xiuliang Ma | 2019 | Journal of Materials Science & Technology2019，35，3： | 5 |
| 13 | Small molecular non-fullerene electron acceptors for P3HT-based bulk-heterojunction solar cells显示文摘Three small molecules with the same arms and different cores of perylene diimide(PDI)or indaceno[2,1-b:6,5-b']dithiophene(IDT)were designed and synthesized as the acceptor materials for P3HT-based bulk-heterojunction(BHJ)solar cells.The impacts of the different cores on the optical absorption,electrochemical properties,electron mobility,film morphology,photoluminescene characteristics,and solar cell performance were thoroughly studied.The three compounds possess a broad absorption covering the wavelength range of 400–700 nm and relatively low lowest unoccupied molecular orbital(LUMO)energy levels of?3.86,?3.81 and?3.99 eV.The highest power conversion efficiency of 0.82%was achieved for the BHJ solar cells based on SM3 as the acceptor material,the compound with a PDI core. | LIU Xin CAI Ping CHEN DongChen CHEN JunWu SU ShiJian CAO Yong | 2014 | Science China Chemistry2014，57，7： | 5 |
| 14 | Numerical Simulation and Experiments of Hydroforming of Rectangular-section Tubular Component显示文摘In order to reduce high calibration pressure in hydroforming of components with too small radii, a method wasproposed to manufacture automotive hollow components with rectangular shape by relatively lower pressure. Theprocess is simulated and analyzed. It is thought that the friction force between the die surface and tube is a mainreason that high pressure is needed to form small radii. Using the method proposed in this paper, a petal-like sectionshape is first preformed so that the central zones of the four sides of the preform section do not contact with the diesides, thus the tube metal is easy to flow into the transition radii area in calibration stage. Moreover, a positive forcealong the sides is produced by the internal pressure, which is beneficial to overcome the friction force and push thematerial into the radii. Therefore, the pressure for forming the transition radii is greatly reduced and the componentswith small radii can be formed with relatively lower pressure. For the experimental case conducted in this paper, theforming pressure is reduced by about 28.6% than the estimated forming pressure. | Shijian YUAN Gang LIU Xianwei TIAN Z.R.WANG | 2003 | Journal of Materials Science & Technology2003，19，z1： | 5 |
| 15 | Microstructure and mechanical properties of CoCrNi-Mo medium entropy alloys:Experiments and first-principle calculations显示文摘The effect of Mo additions on the microstructures and mechanical properties of CoCrNi alloys was investigated,meanwhile,ab initio calculations are performed to quantitatively evaluate the lattice distortion and stacking fault energy(SFE).The yield strength,ultimate tensile strength,and elongation of(CoCrNi)_(97)Mo_(3)alloy are 475 MPa,983 MPa and 69%,respectively.The yield strength is increased by~30%and high ductility is maintained,in comparison with CoCrNi alloy.Besides the nano-twins and dislocations,the higher density of stacking faults is induced during the tensile deformation for(CoCrNi)_(97)Mo_(3)alloy.Ab initio calculation results indicate the mean square atomic displacement(MSAD)and SFE value of(CoCrNi)_(97)Mo_(3)alloy is 42.6 pm^(2)and-40.4 mJ/m^(2)at 0 K,respectively.The relationship between mechanical properties and MSAD,SFE for various multiple principal element alloys is discussed. | Ruobin Chang Wei Fang Jiaohui Yan Haoyang Yu Xi Bai Jia Li Shiying Wang Shijian Zheng Fuxing Yin | 2021 | Journal of Materials Science & Technology2021，，3： | 5 |
| 16 | Rheological Behavior of Semi-Solid AZ91D Alloy显示文摘The rheological behavior and microstructure of semi-solid AZ91D was studied using a Couette type viscometer. The results show that the apparent viscosity of semi-solid AZ91D increases with the cooling rate increasing when it is continuously cooled and mechanically stirred and the empiric relation of the apparent viscosity with the cooling rate and solid fraction at shearing rate 93.7 s-1 is expressed as η=[0.66 - 0.63e(-ε/3.01)]e(fs/0.14), and with the shearing rate and solid fraction at cooling rate 4℃/min is shown as η=0.55e(fs/0.11-γ/87.59), as well as the cooling rate and shearing rate have an important effect on the microstructure of the semi-solid AZ91D alloy slurry, and decreasing the cooling rate and increasing the shearing rate are favorable to the nondendritic evolution of the primary grains. | Weimin MAO, Zisheng ZHEN, Shijian YAN and Xueyou ZHONGSchool of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China | 2004 | Journal of Materials Science & Technology2004，20，5： | 4 |
| 17 | Degradation of phenol in industrial wastewater over the F–Fe/TiO_2 photocatalysts under visible light illumination显示文摘F–Fe/TiO_2 composite photocatalyst was synthesized by a facile one-step hydrothermal method and then characterized by XRD, XPS and UV–Vis DRS. The catalyst of F–Fe/TiO_2 exhibited the highest photodegradation rate for phenol as compared with pure TiO_2, F/TiO_2, Fe/TiO_2, F0.38–Fe0.13–TiO_2 and Fe(III)/F-TiO_2 under visible light irradiation. The simulated conditions of industrial phenolic wastewater including initial phenol concentration,visible light intensity, p H and different anions were investigated in the presence of F–Fe/TiO_2 photocatalyst. In addition, as expected, the F–Fe/TiO_2 photocatalyst displayed excellent stability, showing a potential industrial application for the treatment of phenolic wastewater. | Yandong Liu Shijian Zhou Fu Yang Hua Qin Yan Kong | 2016 | Chinese Journal of Chemical Engineering2016，24，12： | 4 |
| 18 | Ecotoxicological effects of waterborne PFOS exposure on swimming performance and energy expenditure in juvenile goldfish (Carassius auratus)显示文摘The potential risks of perfluorooctane sulfonate (PFOS) are of increasing ecological concern. Swimming performance is linked to the fitness and health of fish. However, the impacts of PFOS on swimming performance remain largely unknown. We investigated the ecotoxicological effects of acute exposure to PFOS on the swimming performance and energy expenditure of juvenile goldfish (Carassius auratus). The fish were exposed to a range of PFOS concentrations (0, 0.5, 2, 8 and 32 mg/L) for 48 hr. The spontaneous swimming activity, fast-start swimming performance, critical swimming speed (Ucrit) and active metabolic rate (AMR) of the goldfish were examined after exposure to PFOS. PFOS exposure resulted in remarkable effects on spontaneous activity. Motion distance was reduced, and the proportion of motionless time increased with increasing concentrations of PFOS. However, no significant alterations in the fast-start performance-related kinematic parameters, such as latency time, maximum linear velocity, maximum linear acceleration or escape distance during the first 120 msec after stimulus, were observed after PFOS exposure. Unexpectedly, although PFOS exposure had marked influences on the swimming oxygen consumption rates and AMR of goldfish, the U crit of the goldfish was not significantly affected by PFOS. This may result in a noteworthy increase in the energetic cost of transport. The overall results indicate that, in contrast to spontaneous activity, underlying swimming capabilities are maintained in goldfish after short-term exposure to PFOS, but energy expenditure during the process of swimming is dramatically aggravated. | Jigang Xia Shijian Fu Zhendong Cao Jianglan Peng Jing Peng Tingting Dai Lili Cheng | 2013 | Journal of Environmental Sciences2013，25，8： | 4 |
| 19 | Protecting healthcare personnel from 2019-nCoV infection risks:lessons and suggestions显示文摘The outbreak of a novel coronavirus disease(COVID-19,caused by the 2019-nCoV infection)in December 2019 is one of the most severe public health emergencies since the founding of People’s Republic of China in 1949.Healthcare personnel(HCP)nationwide are facing heavy workloads and high risk of infection,especially those who care for patients in Hubei Province.Sadly,as of February 20,2020,over two thousand COVID-19 cases are confirmed among HCP from 476 hospitals nationwide,with nearly 90%of them from Hubei Province.Based on literature search and interviews with some HCP working at Wuhan,capital city of Hubei,we have summarized some of the effective measures taken to reduce infection among HCP,and also made suggestions for improving occupational safety during an infectious disease outbreak.The experience and lessons learned should be a valuable asset for international health community to contain the ongoing COVID-19 epidemic around the world. | Zhiruo Zhang Shelan Liu Mi Xiang Shijian Li Dahai Zhao Chaolin Huang Saijuan Chen | 2020 | Frontiers of Medicine2020，14，2： | 4 |
| 20 | Highly efficient pure white polymer light-emitting devices based on poly(N-vinylcarbazole) doped with blue and red phosphorescent dyes显示文摘Efficient white-polymer-light-emitting devices (WPLEDs) have been fabricated with a single emitting layer containing a hole-transporting host polymer,poly(N-vinylcarbzole),and an electron-transporting auxiliary,1,3-bis[(4-tert-butylphenyl)-1,3,4-oxadiazolyl]-phenylene,codoped with two phosphorescent dyes:Iridium(III)bis (2-(4,6-difluorophenyl)-pyridinato-N,C2') picolinate (FIrpic) and home-made Ir-G2 for blue and red emission,respectively.With the structure of ITO/PEDOT:PSS 4083(40 nm)/emission layer(80 nm)/Ba(4 nm)/Al(120 nm),the device showed a maximal luminous efficiency (LE) of 13.5 cd A-1(corresponding to an external quantum efficiency (EQE) of 6.8%),and a peak power efficiency (PE) of 6.5 lm W-1 at 6.0 V.Meanwhile,the device exhibited pure white emission with Commission Internationale de l'Eclairage (CIE) coordinates of (0.34,0.35) at a current density of 12 mA cm-2,which is very close to the equi-energy white point with CIE coordinates of (0.33,0.33).The device performance can be further optimized when more balanced hole/electron injection is achieved by incorporating a lower conducting type anode buffer layer (PEDOT:PSS) and incorporating poly[(9,9-bis(3'-(N,N-dimethylamino)propyl)-2,7-fluorenene)-alt-2,7-(9,9-dioctyfluorene)] (PFN) as an electron injection layer at the cathode.The optimized device showed an LE of 24.6 cd A-1 (with an EQE of 14.1%),while the peak power efficiency reached 12.66 lm W-1.Moreover,the WPLEDs showed good electroluminescence (EL) stability over a wide range of operating current density and luminance. | HU SuJun ZOU JianHua ZHOU GuiJiang LI DongYun WU HongBin SU ShiJian WONG Wai-Yeung YANG Wei PENG JunBiao CAO Yong | 2011 | Science China Chemistry2011，54，4： | 4 |
您所在的机构暂未开通此部分的功能，请联系管理员