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| 1 | Microstructures and Mechanical Properties of Vacuum Brazed Ti3Al/TiAl Joints Using Two Ti-based Filler Metals显示文摘Vacuum brazing of Ti3Al-based alloy to Ti Al was firstly carried out by Ti—15Cu—15Ni(wt%) filler metal.A continuous Ti3 Al band, Ti2 Ni and Ti2Cu/Cu3 Ti phases formed and the joint showed a shear strength of53.8–112.4 MPa at room temperature. For the improvement of the joint strength, a new Ti—Zr—Cu—Ni—Fe filler alloy was designed, and its wettability on Ti3 Al and Ti Al substrate was studied with the sessile drop method. After holding for 20 min at 1010 °C the Ti—Zr—Cu—Ni—Fe filler showed a low contact angle of20° and 21° on (Ti)_3Al and Ti Al substrate, respectively. The joint brazed with this novel filler mainly consisted of Ti-rich area, (Ti)_3Al reaction layer and residual filler metal. With the increase of the brazing temperature, the amount of residual filler metal decreased and the (Ti)_3 Al reaction layer thickened. The (Ti)_3Al/Ti Al joint brazed with Ti—Zr—Cu—Ni—Fe filler exhibited a lower hardness than that brazed with Ti—Cu—Ni filler. The corresponding joints brazed at 950 °C for 5 min presented the shear strength of257.6 ± 33.6 MPa at room temperature and 304.8 ± 9.9 MPa at 600 °C. | H.S.Ren H.P.Xiong B.Chen S.J.Pang B.Q.Chen L.Ye | 2016 | Journal of Materials Science & Technology2016，32，4： | 12 |
| 2 | Improved mechanical properties in titanium matrix composites reinforced with quasi-continuously networked graphene nanosheets and in-situ formed carbides显示文摘In order to construct quasi-continuously networked reinforcement in titanium(Ti)matrix composites,in this study,Ti-6 Al-4 V spherical powders were uniformly coated with a graphene nanosheet(GNS)layer by high energy ball milling and then consolidated by spark plasma sintering.Results showed that the GNS layer on the powder surface inhibited continuous metallurgy bonding between powders during sintering,which led to the formation of quasi-networked hybrid reinforcement structure consisting of insitu Ti C and remained GNSs.The networked GNSs/Ti64 composite possessed noticeably higher tensile strength but similar ductility to the Ti64 alloy,leading to both better tensile strength and ductility than the GNSs/Ti composite with randomly dispersed GNSs and Ti C.The formation mechanism and the fracture mechanism of the networked hybrid reinforcement were discussed.The results provided a method to fabricate Ti matrix composites with high strength and good ductility. | Q.Yan B.Chen L.Cao K.Y.Liu S.Li L.Jia K.Kondoh J.S.Li | 2022 | Journal of Materials Science & Technology2022，，1： | 8 |
| 3 | Phase-seeded solidification of undercooled Ni-B-Si alloy显示文摘 | L.Q.Xing B.Chen | | 0，，： | 1 |
| 4 | Demographic Determinants of Household Energy Use in the United States显示文摘 | O' Neill B.C B.Chen | | 0，，： | 1 |
| 5 | 查看详情显示文摘 | B.Chen C.Liang J.Yang D.S.Contreras Y.L.Clancy E.B.Lobkovsky O.M.Yaghi and S.Dai | | 0，，09： | 1 |
| 6 | 查看详情显示文摘 | B.Chen C.Liang J.Yang D.S.Contreras Y.L.Clancy E.B.Lobkovsky O.M.Yaghi and S.Dai | | 0，，09： | 1 |
| 7 | Development of Low-carbon City in China:Where Will it Go显示文摘 | M.R.Su B.Chen T.Xing C.Chen Z.F.Yang | | 0，，13： | 1 |
| 8 | A Review of Machine Scheduling:Complexity,Algorithms,and Approximability显示文摘 | B.Chen C.N.potts G.J.Woegiger | | 0，，21： | 1 |
| 9 | Copy number variations of the human histamine H4 receptor gene are associated with systemic lupus erythematosus显示文摘 | B.Yu Y.Shao P.Li J.Zhang Q.Zhong H.Yang X.Hu B.Chen X.Peng Q.Wu Y.Chen M.Guan J.Wan W.Zhang | 2010 | British Journal of Dermatology2010，，5： | 1 |
| 10 | Peristaltic flow with convective mass condition and thermal radiation显示文摘The primary objective of present investigation is to introduce the novel aspects of convective mass condition and thermal radiation in the peristaltic transport of fluid. Magnetohydrodynamic(MHD) fluid was considered in a symmetric channel. Heat and mass transfer characteristics were analyzed in the presence of Soret and Dufour effects, and the results were presented via two forms of thermal radiation. The temperature, concentration and pressure rise per wavelength were examined. It is observed that the velocity slip and magnetic field parameters have opposite effects on the pressure rise per wavelength. Temperature of fluid is a decreasing function of the radiation parameter. Further, the temperature of fluid decreases by increasing the heat transfer Biot number. It is notified that the heat transfer rate at the wall is a decreasing function of radiation parameter. | F.M.Abbasi T.Hayat B.Ahmad B.Chen | 2015 | Journal of Central South University2015，22，6： | 1 |
| 11 | Determination of Vapor Pressure of Liquid Copper by Carrier Gas Method显示文摘The relationship between the vapor pressure of liquid copper and the flow rate of carrier gas argon was discussed,when the carrier gas method was used to determine the vapor pressure of liquid copper at 1892 K.The proper argon flow rate range obtained was 150e500 mL/min and enough evidence was provided to verify the vapor pressure-flow rate of carrier gas relationship at the target temperature.Based on the proper flow rate range,the vapor pressure of liquid copper was measured at 1609e1892 K.The relationship of vapor pressureetemperature obtained by the method of regression analysis can be expressed as:ln(p/Pa)(25.470 0.903)(39099.8 1574.5)/T.Further,the thermodynamic properties including the heat of vaporization and the Gibbs free energy of the Cu(l)Cu(g)reaction were calculated by the vapor pressure obtained over the temperature range covered. | Y.J.Duan B.Chen Y.C.Ma M.Gao K.Liu | 2013 | Journal of Materials Science & Technology2013，29，12： | 0 |
| 12 | Improving sampling depth of laser speckle imaging by topical optical clearing:A theoretical and in vivo study显示文摘The effect of optical cleaning method combined with laser speckle imaging(LSI)was discussed to improve the detection depth of LSI due to high scattering characteristics of skin,which limit its clinical application.A double-layer skin tissue model embedded with a single blood vessel was established,and the Monte Carlo method was used to simulate photon propagation under the action of light-permeating agent.808 nm semiconductor and 632.8 nm He–Ne lasers were selected to study the e®ect of optical clearing agents(OCAs)on photon deposition in tissues.Results show that the photon energy deposition density in the epidermis increases with the amount of tissue°uid replaced by OCA.Compared with glucose solution,polyethylene glycol 400(PEG 400)and glycerol can considerably increase the average penetration depth of photons in the skin tissue,thereby raising the sampling depth of the LSI.After the action of glycerol,PEG 400,and glucose,the average photon penetration depth is increased by 51.78%,51.06%,and 21.51%for 808nm,68.93%,67.94%,and 26.67%for 632.8 nm lasers,respectively.In vivo experiment by dorsal skin chamber proves that glycerol can cause a substantial decrease in blood°ow rate,whereas PEG 400 can signicantly improve the capability of light penetration without a®ecting blood velocity,which exhibits considerable potential in the monitoring of blood°ow in skin tissues. | D.Li Y.Zhang B.Chen | 2020 | Journal of Innovative Optical Health Sciences2020，，2： | 0 |
| 13 | Retrospect and prospect of watershed hydrological model显示文摘A brief review is presented of the development of watershed hydrological models. Conventional Hydrological Model, Grey Hydrological Model, Digital Hydrological Model and Intelligent Hydrological Model are analyzed. The frameworks of Fuzzy Cognitive Hydrological Model and Integrated Digital Watershed Hydrological Model are presented. | B.CHEN Z.F.YANG 等 | 2001 | Communications in Nonlinear Science and Numerical Simulation2001，6，3： | 0 |
| 14 | A high-power and high-stability power supply design显示文摘Objective BEPCII is a high-performance collider with a design energy of 2.1 GeV. In order to obtain more physical experimentsand synchrotron radiation applications, BEPCII decided to carry out energy upgrading to 2.5 GeV. Insufficient energyof special magnet power supplies in collision zone is a key factor restricting BEPCII’s operation under 2.5 GeV energy.Therefore, three high-power and high-stability power supplies are designed for BEPCII energy upgrading.Methods The designed power supplies output part adopts high-frequency chopper modules parallel connected and adoptsdigital-analog hybrid control methods. The voltage loop regulator uses high-speed analog control, and current loop regulatoruses digital control which is based on FPGA.Conclusion The experimental data show that the output current stability of the developed power supplies is lower than50 ppm. The output current resolution is lower than 70 ppm. The developed power supplies can well meet the design requirementsof BEPCII energy upgrading. | P.Liu B.Chen P.F.Wei | 2021 | Radiation Detection Technology and Methods2021，5，2： | 0 |
| 15 | Development of high-precision DC power supply prototype for HEPS-TF显示文摘Purpose This power supply prototype is developed for the quadrupole magnets in the storage ring of HEPS.The project requires a high current stability of these power supplies,in order to master the key technology of this type of power supply in advance,a prototype is made in the project of HEPS test facility.Methods Modularization is used in the prototype’s topology and a combination of digital and analog control is adopted in the closed-loop control.Three control loops are used to improve the output current’s quality.In order to improve the current stability,the key devices in the circuit are under thermostatical controlled.Results The acceptance test results for the NDRC are given in details,which show that all the parameters are better than the design indexes.Conclusions After a lot of experiments and tests,all the parameters of this prototype passed the acceptance test.Among the results,the stability of this prototype achieved 5.2 ppm,the repeatability is 3.2 ppm,and the low-frequency voltage ripples are lower than the requirements of Physicists.The success of this prototype means that the requirements of power supplies in physical design can be met. | X.L.Guo F.L.Long B.Chen P.Liu | 2019 | Radiation Detection Technology and Methods2019，3，2： | 0 |
| 16 | Development of dipole magnet power supply for BEPC-II energy upgrading project显示文摘Purpose In order to make BEPC-II to run at a higher energy,the Institute of High Energy Physics undertook an upgrading project.One of the important factors limiting the energy boost is the power and performance of the dipole magnet power supplies;therefore,these four magnet power supplies are developed for the BEPC-II upgrading.Methods The power supplies adopt topologies of thyristor rectifiers to realize a high-power output.In the control unit of each power supply,a digital current closed loop is adopted,and the key components in the feedback loop are thermostatically controlled.In order to improve the performances of the power supplies,analog voltage regulators are added to the inner control loops.Results These four power supplies have been tested and have already been officially used in BEPC-II,and their powers have reached the requirements of the upgrading.The test results of the current stability are described and shown in this paper,which testifies that the stabilities meet the design parameters.Conclusions A digital control is applied to each SCR rectifier control.The performances of the power supplies are improved by the combination of digital current control loops and the analog voltage control loops,which makes the performances of the dipole magnet power supplies meet the requirements of the upgrading project. | X.L.Guo B.Chen C.Han Y.Gao | 2019 | Radiation Detection Technology and Methods2019，3，2： | 0 |
| 17 | 柔性救援机器人的开发和混合力/位置控制显示文摘灾难发生后,在废墟中执行搜救任务需要具有细长和柔韧结构的救援机器人,以适应废墟下的复杂结构。本文介绍了一种具有细长和灵活体型的新型腱鞘驱动的柔性救援机器人的结构设计和系统组成。本文提出的机器人可以钻入救援人员和传统的刚性机器人无法进入的狭窄空间或有毒环境。本文分析讨论了带有集成定位和施力监视能力的柔性夹持器的自传感校准、动态建模和混合力/位置控制轨迹。为了在运行过程中调节夹持器的位移和夹紧力,本文提出了一种基于级联比例—积分—微分(PID)控制器和模糊滑模控制器(FSMC)的混合力/位置控制策略。建立了主要由伺服电机、腱鞘传动部件、柔性夹持器和实时控制系统组成的实验装置,用于校准应变式传感器并识别动态模型参数。开展了涉及力跟踪实验、位置跟踪实验和目标抓取实验的进一步实验研究。实验结果证明了所开发的自传感方法和控制策略在救援行动中的有效性。 | Q.C.Wu X.S.Wang B.Chen H.T.Wu Z.Y.Shao 张孟怡(译) 王萍(译) 李悦(译) 李万金(校) | 2020 | 世界地震译丛2020，51，3： | 0 |
| 18 | Deciphering the molecular and physiological connections between obesity and breast cancer显示文摘Obesity is associated with the higher risk of breast cancer in postmenopausal women.The leptin signaling pathway is recognized to primarily regulate energy balance and associated with breast cancer.Furthermore,the estrogen signaling pathway plays a critical role in breast carcinogenesis.In this review,we discuss how obesity is linked to breast cancer via cross-talk of leptin and estrogen pathways. | Zhao HE Andy B.CHEN Gen-Sheng FENG | 2011 | Frontiers in Biology2011，6，3： | 0 |
| 19 | DEVELOPMENT OF A DECISION SUPPORT SYSTEM FOR MANAGING PESTICIDE LOSSES IN AGRICULTURAL WATERSHEDS显示文摘In this study, a decision support system for managing pesticides losses in agricultural watersheds, based on a number of simulation, GIS and RS technologies was developed. The system allows acquisition of information through not only on-site survey but also RS technologies. Aerial photographs were used to generate DEM, and a set of terrain analysis methods were employed to calculate hydrological parameters that are needed for the pesticide loss model. The system also facilitates convenient management and presentation of vast amounts of modeling inputs and outputs through user interfaces. A case study in the Kintore Creek Watershed, Ontario, Canada was undertaken to provide bases for environmental management in the watershed and to demonstrate practical applicability of the developed DSS. The modeling outputs were verified through monitoring data, demonstrating reasonable prediction accuracy. The result indicated that the model provides an effective means for forecasting pesticide losses from agriculture lands. Especially, incorporation of GIS and remote sensing with the pesticides losses model provide a powerful tool for system simulation and environmental management. The major contribution of this study is the development of a new integrated modeling system for simulating fate of pesticides in agricultural lands, as well as its application to a real Canadian case study. In detail, a dynamic simulation model was developed, a solution algorithm was implemented, and the modeling results were verified. The developed simulator was also enhanced through incorporation of GIS and RS technologies within its framework to facilitate effective data acquisition and management, as well as input/output presentation. DEVELOPMENT OF A DECISION SUPPORT SYSTEM FOR MANAGING PESTICIDE LOSSES IN AGRICULTURAL WATERSHEDS Y.-F. LI1, Y. R. LI2, G. H. HUANG2, J. STRUGER3, J. D. FISCHER4, Xinzhu WANG5, B. CHEN2, J. B. LI2 and X. H. NIE2 ABSTRACT In this study, a decision support system for managing pesticides losses in agricultural watersheds, based on a number of simulation, GIS and RS technologies was developed. The system allows acquisition of information through not only on-site survey but also RS technologies. Aerial photographs were used to generate DEM, and a set of terrain analysis methods were employed to calculate hydrological parameters that are needed for the pesticide loss model. The system also facilitates convenient management and presentation of vast amounts of modeling inputs and outputs through user interfaces. A case study in the Kintore Creek Watershed, Ontario, Canada was undertaken to provide bases for environmental management in the watershed and to demonstrate practical applicability of the developed DSS. The modeling outputs were verified through monitoring data, demonstrating reasonable prediction accuracy. The result indicated that the model provides an effective means for forecasting pesticide losses from agriculture lands. Especially, incorporation of GIS and remote sensing with the pesticides losses model provide a powerful tool for system simulation and environmental management. The major contribution of this study is the development of a new integrated modeling system for simulating fate of pesticides in agricultural lands, as well as its application to a real Canadian case study. In detail, a dynamic simulation model was developed, a solution algorithm was implemented, and the modeling results were verified. The developed simulator was also enhanced through incorporation of GIS and RS technologies within its framework to facilitate effective data acquisition and management, as well as input/output presentation. Key Words: Agriculture, Decision, GIS, Nonpoint source, Pesticide, Rainfall, Remote sensing, Runoff, Simulation, | Y.-F.LI Y.R.LI G.H.HUANG J.STRUGER J.D.FISCHER B.CHEN J.B.LI X.H.NIE | 2003 | International Journal of Sediment Research2003，18，1： | 0 |
| 20 | Kinetics of Al Evaporation from Liquid U-Al Alloys in Vacuum Induction Melting显示文摘A research on kinetics of Al evaporation from liquid U—Al alloys was made in a vacuum induction melting(VIM) furnace at 1673—1843 K.The evaporation rate of Al was found to be first order with respect to Al content in the melt.The overall mass transfer coefficient of Al was determined and it was found that the evaporation rate of Al increased with increasing temperatures.The apparent activation energy of Al evaporation at 1673-1843 K was 171.5 kJ mol^(-1).The value of mass transfer coefficient of Al in the liquid phase was estimated to be 3.77 × 10^(-6),7.41×10^(-6),and 9.40 × 10^(-6) m s^(-1) at 1673,1753,and 1843 K,respectively.Meanwhile,rate determining steps were discussed and it was concluded that the evaporation rate of Al is mainly controlled by liquid phase mass transfer. | Y.J.Duan B.Chen Y.C.Ma K.Liu | 2015 | Journal of Materials Science & Technology2015，31，4： | 0 |
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