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| 1 | Brazing of C/C composite and Ti-6Al-4V with graphene strengthened AgCuTi filler:Effects of graphene on wettability,microstructure and mechanical properties显示文摘Graphene nanosheets(GNSs) strengthened AgCuTi composite filler(AgCuTi_G) was used to braze C/C composite and Ti-6Al-4V. The effects of GNSs on the wettability of AgCuTi_G filler on the C/C composite surface and the interfacial microstructure and mechanical properties of brazed joints were investigated. The results indicate that the addition of GNSs reduced the wettability of AgCuTi_G. The interfacial microstructure of brazed joints evolved with the addition of GNSs, where Ti_3Cu_4 and TiCu_4 were converted to TiCu and the thickness of the reaction layer adjacent to the base material decreased. The maximum shear strength of joints brazed at 0.3 wt% GNSs was 23.3 MPa(880℃/10 min). Further adding GNSs deteriorated the shear strength of the joints. Fracture of the joints occurred in the C/C composite substrate and the TiC layer adjacent to C/C composite. | Duo LIU Yanyu SONG Yinghao ZHOU Xiaoguo SONG Wei FU Jicai FENG | 2018 | Chinese Journal of Aeronautics2018，31，7： | 11 |
| 2 | Mechanical Properties and Microstructure of 6082-T6 Aluminum Alloy Joints by Self-support Friction Stir Welding显示文摘The majority of this research has concentrated on developing the self-support friction stir welding(SSFSW) tool which consists of a big concave upper shoulder and a small convex lower shoulder, and procedures for making reliable welds in aluminum hollow extrusion. The 5-mm-thick 6082-T6 aluminum alloy was self-support friction stir welded at a constant tool rotation speed of 800 r/min. The effect of welding speed on microstructure and mechanical properties was investigated. The results of transverse tensile test indicated that the tensile strength of joints increased and the elongation decreased with increasing welding speed. The whole values of microhardness of SSFSW joints increased with increasing welding speed from 10 to 200 mm/min. The defectfree joints were obtained at lower welding speeds and the tensile fracture was located at the heat-affected zone(HAZ) adjacent to the thermo-mechanically affected zone(TMAZ) on the advancing side. The investigation of the flow pattern of the softened metal around the SSFSW tool revealed that the flow pattern of the softened metal was driven by two shoulders and the stir pin. The failure of specimens in tension presented the ductile fracture mode. | Long Wan Yongxian Huang Weiqiang Guo Shixiong Lv Jicai Feng | 2014 | Journal of Materials Science & Technology2014，30，12： | 10 |
| 3 | Vacuum brazing of GH99 superalloy using graphene reinforced BNi-2 composite filler显示文摘A novel graphene reinforced BNi-2 composite filler was developed for brazing GH99 superalloy. The interfacial microstructure of brazed joints was analyzed by field emission scanning electron microscope and a transmission electron microscope. The effects of graphene addition on the microstructure evolution and mechanical properties of brazed joints were investigated, and the strengthening mechanism of graphene was analyzed. The results revealed that due to the addition of graphene, M23(C,B)6 compounds were synthesized in the solid solution and brittle boride precipitates near the brazing seam decreased.Graphene was effective in retarding solute atoms diffusion thus impeding the precipitation of borides.Furthermore, the low coefficient of thermal expansion(CTE) of graphene was conducive to relieve stress concentration of the brazed joints during the cooling process. The shear strengths of brazed joints were significantly improved by exerting the strengthening effect of graphene. The maximum shear strengths of the brazed joints were 410.4 MPa and 329.7 MPa at room temperature and 800?C, respectively. | Duo Liu Yanyu Song Bin Shi Qi Zhang Xiaoguo Song Hongwei Niu Jicai Feng | 2018 | Journal of Materials Science & Technology2018，34，10： | 10 |
| 4 | Synthesis of graphene on a Ni film by radio-frequency plasma-enhanced chemical vapor deposition显示文摘Large-area single-or multilayer graphene of high quality is synthesized on Ni films by radio-frequency plasma-enhanced chemical vapor deposition (RF-PECVD) at a relatively low temperature (650℃).In the deposition process,a trace amount of CH4 gas (2-8 sccm (sccm denotes standard cubic centimeter per minute at STP)) is introduced into the PECVD chamber and only a short deposition time (30-60 s) is used.Single-or multilayer graphene is obtained because carbon atoms from the discharging CH4 diffuse into the Ni film and then segregate out at its surface.The layer number of the obtained graphene increases when the deposition time or CH4 gas flow rate is increased.This investigation shows that PECVD is a simple,low-cost,and effective technique to synthesize large-area single-or multilayer graphene,which has potential for application as electronic devices. | QI JunLei ZHANG LiXia CAO Jian ZHENG WeiTao WANG Xin FENG JiCai | 2012 | Chinese Science Bulletin2012，57，23： | 8 |
| 5 | Analysis of Tianchi volcano activity in Changbai Mountain,NE China显示文摘Changbaishan volcano is the largest potential eruptive volcano in China.In this paper,seismic activity,horizontal displacement,vertical displacement and the fluid geochemistry data acquiring from Changbaishan Tianchi Volcano Observatory(TVO) in recent years are analyzed.The authors discussed the ability for the Changbaishan volcanic seismic monitoring and active level of Changbaishan volcano in recent years based on the fundamental monitoring results.The results show that Changbaishan volcano has experienced an unrest episode from 2002 to 2005,but its active level recovers to the background now. | LIU Guoming YANG Jingkui WANG Lijuan SUN Jicai | 2011 | Global Geology2011，14，1： | 7 |
| 6 | Springback Prediction and Optimization of Variable Stretch Force Trajectory in Three-dimensional Stretch Bending Process显示文摘Most of the existing studies use constant force to reduce springback while researching stretch force. However, variable stretch force can reduce springback more efficiently. The current research on springback prediction in stretch bending forming mainly focuses on artificial neural networks combined with the finite element simulation. There is a lack of springback prediction by support vector regression(SVR). In this paper, SVR is applied to predict springback in the three-dimensional stretch bending forming process, and variable stretch force trajectory is optimized. Six parameters of variable stretch force trajectory are chosen as the input parameters of the SVR model. Sixty experiments generated by design of experiments(DOE) are carried out to train and test the SVR model. The experimental results confirm that the accuracy of the SVR model is higher than that of artificial neural networks. Based on this model, an optimization algorithm of variable stretch force trajectory using particle swarm optimization(PSO) is proposed. The springback amount is used as the objective function. Changes of local thickness are applied as the criterion of forming constraints. The objection and constraints are formulated by response surface models. The precision of response surface models is examined. Six different stretch force trajectories are employed to certify springback reduction in the optimum stretch force trajectory, which can efficiently reduce springback. This research proposes a new method of springback prediction using SVR and optimizes variable stretch force trajectory to reduce springback. | TENG Fei ZHANG Wanxi LIANG Jicai GAO Song | 2015 | Chinese Journal of Mechanical Engineering2015，28，6： | 6 |
| 7 | Interfacial Microstructure and Mechanical Properties of Al/Mg Butt Joints Made by MIG Welding Process with Zn-Cd Alloy as Interlayer显示文摘Butt joints between Mg alloy AZ31 B and pure Al 1 060 sheets were produced via metal inert gas welding process with Zn-Cd alloy foil. Crack-free Al/Mg butt joints between AZ31 B Mg alloy and pure Al 1060 sheets were obtained. Intermetallic compound layer 1 and layer 2 had formed in fusion zone/Mg alloy and the average thickness of the layer 1 was about 50 μm. The intermetallic compound layer 1 consisted of Al12Mg17 and Mg2Si phases while layer 2 consisted of Al12Mg17, Mg2Si and Mg Zn2 phases. The crack started from the IMC layer at the bottom of the joint and propagated along the brittle IMC layer, then expanded into weld metal during the SEM in situ tensile test. The highest tensile strength of the dissimilar metal butt joints could reach 46.8 MPa and the effect ofinterfacial IMC layer on mechanical property of the joint was discussed in detail in the present study. | 张洪涛 DAI Xiangyu FENG Jicai | 2014 | Journal of Wuhan University of Technology(Materials Science)2014，29，6： | 4 |
| 8 | Multi-agent systems for simulating traffic behaviors显示文摘Multi-agent systems allow the simulation of complex phenomena that cannot be easily described analytically. As an efficient tool, the agent-oriented traffic models have emerged to investigate vehicular traffic behaviors. In this article, a new agent-based traffic simulation model is proposed for solving the traffic simulation problems. A vehicle with the driver is represented as a composite autonomous agent in this model. Different from the classical car-following principles, vehicle-agent moving approaches are pro- posed instead of particle-hopping techniques. This model defines reasonable acceleration and deceleration rates at any certain condition. In this simulation, this can offer a natural, even cognitive way to follow the leader and switch lane. The simulation results have verified that this model has achieved more realistic results without loss of accuracy than those obtained from the cel- lular automata traffic models. This model can provide better simulation performance than the traditional vehicle-following models which are used to investigate the nonequilibrium traffic flow. A comparison of the real flow with the simulated freeway flow and lane capacity highlights the validness of this model. | DAI JiCai LI Xia | 2010 | Chinese Science Bulletin2010，55，3： | 4 |
| 9 | Different effects of foliar application of silica sol on arsenic translocation in rice under low and high arsenite stress显示文摘Foliar application of Si can generally reduce As translocation from roots to shoots in rice;however, it does not always work, particularly under high As stress. Here, the effects of foliar application of nanoscale silica sol on As accumulation in rice were investigated under low(2 μmol/L) and high(8 μmol/L) arsenite stress. The results revealed that foliar Si application significantly decreased the As concentration in shoots under low arsenite stress, but showed different effects under high arsenite stress after 7 days of incubation. The reduction in root-to-shoot As translocation under the 2 As + Si treatment was related to the down-regulation of Os Lsi1 and Os Lsi2 expression and up-regulation of Os ABCC1 expression in roots. In the 8 As + Si treatment, the expressions of Os Lsi1, Os Lsi2, and Os ABCC1 were significantly promoted, which resulted in substantially higher As accumulation in both the roots and shoots. In the roots, As predominantly accumulated in the symplasts(90.6%–98.3%), in which the majority of As was sequestered in vacuoles(79.0%–94.0%) under both levels of arsenite stress. Compared with that of the 8 As treatment, the 8 As + Si treatment significantly increased the As concentration in cell walls, but showed no difference in the vacuolar As concentration, which remained constant at approximately 69.1–71.7 mg/kg during days 4–7. It appeared that the capacity of root cells to sequester As in the vacuoles had a threshold, and the excess As tended to accumulate in the cell walls and transfer to the shoots via apoplasts under high arsenite stress. This study provides a better understanding of the different effects of foliar Si application on As accumulation in rice from the view of arseniterelated gene expression and As subcellular distribution in roots. | Dandan Pan Chuanping Liu Jicai Yi Xiaomin Li Fangbai Li | 2021 | Journal of Environmental Sciences2021，33，7： | 3 |
| 10 | Microstructure characterization of electron beam welded joints of Ti_3Al after post-weld heat treatment显示文摘The effect of post-weld heat treatment on the microstructure characterization of electron beam welded(EBW) joints of Ti3Al-Nb was investigated.The results show that the microstructure of the weld is predominantly metastable,the columnar crystal metastructure of B2 phase.The microstructure morphology of the weld is significantly influenced by the method of the heat treatment.The microstructure of the weld is laminar structure(Widmanstaten structure) consisted of interphase α2 and B2 after post-weld heat treatment of 1000 ℃/2 h.The mechanism of the post-weld heat treatment makes the hardness distribution of joints homogeneous,but makes the whole joint somehow softened. | HE Jingshan,WU Qingsheng,ZHANG Binggang,LIU Wei,and FENG Jicai State Key Laboratory of Advanced Welding Production Technology,Harbin Institute of Technology,Harbin 150001,China | 2007 | Rare Metals2007，26，S1： | 3 |
| 11 | Image recognition and empirical application of desert plant species based on convolutional neural network显示文摘In recent years,deep convolution neural network has exhibited excellent performance in computer vision and has a far-reaching impact.Traditional plant taxonomic identification requires high expertise,which is time-consuming.Most nature reserves have problems such as incomplete species surveys,inaccurate taxonomic identification,and untimely updating of status data.Simple and accurate recognition of plant images can be achieved by applying convolutional neural network technology to explore the best network model.Taking 24 typical desert plant species that are widely distributed in the nature reserves in Xinjiang Uygur Autonomous Region of China as the research objects,this study established an image database and select the optimal network model for the image recognition of desert plant species to provide decision support for fine management in the nature reserves in Xinjiang,such as species investigation and monitoring,by using deep learning.Since desert plant species were not included in the public dataset,the images used in this study were mainly obtained through field shooting and downloaded from the Plant Photo Bank of China(PPBC).After the sorting process and statistical analysis,a total of 2331 plant images were finally collected(2071 images from field collection and 260 images from the PPBC),including 24 plant species belonging to 14 families and 22 genera.A large number of numerical experiments were also carried out to compare a series of 37 convolutional neural network models with good performance,from different perspectives,to find the optimal network model that is most suitable for the image recognition of desert plant species in Xinjiang.The results revealed 24 models with a recognition Accuracy,of greater than 70.000%.Among which,Residual Network X_8GF(RegNetX_8GF)performs the best,with Accuracy,Precision,Recall,and F1(which refers to the harmonic mean of the Precision and Recall values)values of 78.33%,77.65%,69.55%,and 71.26%,respectively.Considering the demand factors of hardware equipment and inference time,Mobile NetworkV2 achieves the best balance among the Accuracy,the number of parameters and the number of floating-point operations.The number of parameters for Mobile Network V2(MobileNetV2)is 1/16 of RegNetX_8GF,and the number of floating-point operations is 1/24.Our findings can facilitate efficient decision-making for the management of species survey,cataloging,inspection,and monitoring in the nature reserves in Xinjiang,providing a scientific basis for the protection and utilization of natural plant resources. | LI Jicai SUN Shiding JIANG Haoran TIAN Yingjie XU Xiaoliang | 2022 | Journal of Arid Land2022，14，12： | 2 |
| 12 | The effects of two free-floating plants (Eichhornia crassipes and Pistia stratiotes) on the burrow morphology and water quality characteristics of pond loach (Misgurnus anguillicaudatus) habitat显示文摘Loach exhibit conspicuous drilling behaviors in the mud of shallow waters,yet their burrow morphology and the factors affecting this behavior have received little attention.We characterized the burrow morphology and water quality of the pond loach Misgurnus anguillicaudatus in three scenarios:in tanks without plants,tanks with the free-floating plant water hyacinth Eichhornia crassipes,and tanks with water lettuce Pistia stratiotes.Water hyacinth effectively removed water TN,COD,NO3-N and NH4-N,and water lettuce removed water TP and NH4-N.Water hyacinth and water lettuce markedly reduced water turbidity and DO,increased TOC and EC.Water hyacinth purified water more effectively than water lettuce,providing a suitable habitat for loach feeding,living and burrowing.The burrow structures were V-shaped,Y-shaped,inverted L-shaped,or complicated dendritic networks composed of multiple V shapes.The hyacinth treatment was characterized by the greatest burrow volume,length,depth,and structural complexity,but the opening size was reduced by dense root mat coverage.Burrows in the water lettuce treatment were characterized by intermediate volume,length,branches and sinuosity,but they had the largest opening and pit size.The control treatment had a flat bottom with the smallest,shortest burrows.This study indicates that free-floating plants improve habitat suitability and change burrow morphology and may be used to improve loach breeding methods。 | Jinqing Wang Guihua Fu Weiyue Li Ying Shi Jicai Pang Qiang Wang Weiguang Lü Change Liu Jiansheng Liu | 2018 | Aquaculture and Fisheries2018，3，1： | 2 |
| 13 | The CMT short-circuiting metal transfer process and its use in thin aluminium sheets welding显示文摘 | Jicai Feng Hongtao Zhang Peng He | 2008 | Materials and Design2008，，5： | 2 |
| 14 | Influence of Surface Condition on Expulsion in Spot Welding AZ31B Magnesium Alloy显示文摘Experiments were carried out to study the influence of surface condition on expulsion during the spot welding ofAZ31B Mg alloy. A general electrical contact resistance theory for conductive rough surfaces and the relation betweenmaximum temperature Tm in the contact and voltage-drop V across interface of two surfaces were employed tounderstand the reason of expulsion in Mg alloy spot welding. The main reason of expulsion is that the high electricalcontact resistance induced by large roughness of the surface and oxide film covered on the surface leads to localmelting of metal in the interface of two surfaces, and liquid metal of the local area ejected from the specimen underelectrode force forms expulsion. | Yarong WANG, Jicai FENG and Zhongdian ZHANGState Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin 150001, China | 2005 | Journal of Materials Science & Technology2005，21，5： | 2 |
| 15 | Additive manufacturing of a high-strength ZrC-SiC and TC4 gradient structure based on a combination of laser deposition technique and brazing显示文摘A ZrC-SiC and TC4 gradient structure(ZTGS)was additively manufactured through the laser deposition technique and brazing process.The research results indicated that SiC-reinforced TC4-based gradient layers could be obtained on the TC4 surface by laser deposition.ZrC-SiC and TC4 coated with gradient layers were brazed using an AgCuTi filler to fabricate the ZTGS.The effects of the gradient structure and brazing parameters on the ZTGS strength were investigated.With an increase in Layer II and Layer III thickness,the ZTGS shear strength increased.The brazing temperature and holding time affected the ZTGS shear strength by controlling the formation and distribution of the Cu4Ti phase in the brazing zone.The strengthening mechanism of the ZTGS was revealed by analyzing the residual stress distribution in the ZTGS.Compressive residual stress was formed in ZrC-SiC adjacent to the TC4 substrate or the deposited gradient layer,which was found to negatively affect the properties of the ZTGS.The increase in gradient layer thickness reduced the maximum residual stress in ZrC-SiC,and the effect of Layer III on the residual stress was more significant than that of Layer II.The calculated residual stress evolution matched the ZTGS property values well,revealing the strengthening mechanism. | Qian Wang Junmiao Shi Lixia Zhang Jiangtao Xiong Jinglong Li Ninshu Ma Jicai Feng | 2021 | Journal of Materiomics2021，7，4： | 2 |
| 16 | Vacuum diffusion bonding of TiB2 cermet to TiAl-based alloys 显示文摘 | Li Zhuoran Feng Jicai Cao Jian | 2004 | Materials Science and Technology2004，20，12： | 1 |
| 17 | Influence of dif- ferent filler metals on electron beam welding of titanium al- loy to stainless steel显示文摘 | Wang Ting Zhang Binggang Feng Jicai | 2014 | Trans Nonferrous Met Soc China2014，24，： | 1 |
| 18 | Acetone butanol ethanol (ABE) recovery by pervaporation using silicalite-silicone composite membrane from fed-batch reactor of Clostridium acetobutylicum 显示文摘 | Qureshi N Meagher M M Huang Jicai | 2001 | Journal of Membrane Science2001，187，1： | 1 |
| 19 | Ag-Cu-alloy for brazing TiC cermet/steel 显示文摘 | ZHANG Lixia FENG Jicai ZHENG Baoyou | 2005 | Materials Letters2005，59，1： | 1 |
| 20 | Friction stir welding characteristics of different heat-treated-state 2219 aluminum alloy plates显示文摘 | Chen Yingchun Liu Hui jie Feng Jicai | 2006 | Materials Science and Engineering2006，420，1： | 1 |
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