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| 1 | An improved three-dimensional spherical DDA model for simulating rock failure显示文摘In this paper, a discontinuous numerical model, namely SDDARF3D(three-dimensional spherical discontinuous deformation analysis for rock failure), is proposed for simulating the whole process of rock failure. Firstly, within the framework of the classical discontinuous deformation analysis(DDA) method, the formulation of three-dimensional spherical DDA(3D SDDA) is deduced; secondly, a bonding and cracking algorithm is constructed and the SDDARF3 D model is proposed; thirdly, corresponding VC++ calculation code is developed and some verification examples are calculated. The simulated results can intuitively reproduce the failure phenomena of rock mass, indicating that the proposed SDDARF3 D numerical model is correct and effective. | JIAO YuYong HUANG GangHai ZHAO ZhiYe ZHENG Fei WANG Long | 2015 | Science China(Technological Sciences)2015，58，9： | 13 |
| 2 | Improvement in collapsibility of ZrO2 ceramic mould for investment casting of TiAl alloys显示文摘Investment casting has been widely recognized as the best option in producing TiAl components with key benefits of accuracy,versatility and integrity.The collapsibility of ceramic moulds for investment casting is critical in the manufacturing process of TiAl components due to TiAl's intrinsic brittleness at room temperature.The aim of the present research is to provide a method for production of TiAl components by investment casting in ZrO2 ceramic moulds with improved collapsibility.Slurries prepared with high polymer additions were utilized during the preparation of ceramic moulds.The stress/strain curves obtained from green and baked ceramic moulds demonstrate that the green strength was increased with the application of high polymer,while baked strength decreased,thus the collapsibility of ceramic moulds was improved.It is suggested that this result is related to the burn-out of high polymer which left a lot of cavities.The experimental findings were also verified by the investment casting of 'I'-shaped TiAl components. | Chen Yanfei Xiao Shulong Tian Jing Xu Lijuan Kong Fantao Chen Yuyong | 2011 | China Foundry2011，8，1： | 8 |
| 3 | A grey multi-objective programming approach for sustainable land-use in the Miyun Reservoir Basin,China显示文摘Miyun Reservoir is the most important water source to Beijing City. Land-use of the basin plays a great role in the protection of water resources. Hence a sustainable land-use planning is required to optimize land-use structure and protect water resources in the basin. Based on the complete land-use system analysis in Miyun, a grey multi-objective programming to basin land-use(GMOPBLU) model was developed and applied to land-use planning. Two alternatives were produced and analyzed by means of interactive adjustment and scenario analysis. The results showed the GMOPBLU model is a valuable approach for basin land-use planning. | GUOHuai-cheng ZHANGZhen-xing YUYong | 2004 | Journal of Environmental Sciences2004，16，1： | 6 |
| 4 | Effect of cold rolling process on microstructure and mechanical properties of high strength β titanium alloy thin sheets显示文摘The microstructure and mechanical properties of Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe high strength titanium alloy sheets prepared by unidirectional cold rolling and two-step cross cold rolling were investigated. Results showed that the β phase grains were refined significantly by cold rolling followed by solution treatment for a short time.Compared to unidirectional cold rolling, the short time solution treatment after two-step cross rolling could significantly reduce the non-uniformity of the microstructure of the alloy sheets. After aging treatment at 550 ℃,the anisotropy of the mechanical properties still existed in the unidirectional rolled sheets, and the tensile strength was highest along the rolling direction. After solution and aging treatment, the anisotropy of the mechanical properties of the two-step cross rolling process sheet was not obvious than unidirectional cold rolling,and alloy had good strength and plasticity matching. | Yan Ma Zhaoxin Du Xiaoming Cui Jun Cheng Guolong Liu Tianhao Gong Huimin Liu Xiaopeng Wang Yuyong Chen | 2018 | Progress in Natural Science:Materials International2018，28，6： | 6 |
| 5 | Effect of controlled low central venous pressure on renal function in major liver resection显示文摘Objective: To investigate the effects of low central venous pressure (LVCP) on blood loss and evaluate its influ- ence on renal function in patients undergoing hepatectomy. Methods: Forty-six patients, ASA classification I–III, undergoing liver resection were randomized into LCVP group (n = 23) and control group (n = 23). In LCVP group, CVP was maintained at 2–4 mmHg and MBP above 60 mmHg during hepatectomy, while in control group hepatectomy was performed routinely without lowering CVP. Volume of blood loss during hepatectomy, volume of blood transfusion, and changes of renal functions were compared between the two groups. Results: There were no significant differences in demographics, ASA score, type of hepatectomy, duration of inflow occlusion, operation time, weight of resected liver tissues, and renal functions between the two groups. LCVP group had a significantly lower volume of total intraoperative blood loss (P < 0.01) and RBC transfusion (P < 0.05). Conclusion: Lowering the CVP to less than 5 mmHg is a simple and effective technique to reduce blood loss and blood infusion during liver resection, and has no detrimental effects on renal functions. | Yuyong Liu Mingxue Cai Shan'e Duan Xuemei Peng Yong Lai Yalan Li | 2008 | The Chinese-German Journal of Clinical Oncology2008，7，1： | 5 |
| 6 | Influence of Voids on the Tensile Performance of Carbon/epoxy Fabric Laminates显示文摘This paper aims at investigating the effect of voids on the tensile properties of [(±45)4/(0,90)/(±45)2] S and [(±45)/0 4/(±45)(0,90)] S composites.Specimens with void contents in the range of 0.4% to 9.0% were fabricated from carbon/epoxy fabric.The void content was determined by ultrasonic attenuation and optical image analysis,and microscopic inspection was also used to analyze the shape and size of the voids.The influence of voids on the tensile strength and modulus of both stacking sequence is compared in terms of the size and the shape of the voids.The effect of voids on the initiation and propagation of tensile failure of both stacking sequence composite was investigated. | Hongyan Zhu Baochang Wu Dihong Li Dongxing Zhang Yuyong Chen | 2011 | Journal of Materials Science & Technology2011，27，1： | 5 |
| 7 | Characterization of zirconia-based slurries with different binders for titanium investment casting显示文摘The materials and physical properties of primary slurry are crucial to the surface quality of the finished castings,especially for high reactivity titanium alloys.The aim of this study is to investigate the influence of different binders on the physical properties of primary slurry for titanium alloy investment casting.The zirconia-based slurries with different binders were evaluated by comparing the parameters:viscosity,bulk density,plate weight, suspensibility,gel velocity and strength.The results indicate that a higher viscosity of binder leads to a higher viscosity and suspensibility of slurry with the same powder/binder ratio.The retention rate and thickness of primary layer increase with an increase in the viscosity of the slurry,and a higher retention rate is associated with a thicker primary layer.The gel velocity of the slurry is correlated with the gel velocity of the binder.The green strength and the baked strength of the primary layer are determined by the properties of the binder after gel and by the production of the binder after fired,respectively. | Zhao Ertuan Kong Fantao Chen Yanfei Chen Ruirun Chen Yuyong | 2012 | China Foundry2012，9，2： | 4 |
| 8 | Effect of V and Nb additions on microstructure,properties,and deformability of Ti-45Al-9 (V,Nb,Y) alloy显示文摘Ti-45Al-9(V, Nb, Y) alloys with four different x=V/Nb (atomic ratio x = 1, 1.5, 2 and 3.5) have been prepared, and the microstructures, properties and hot deformation behaviors were investigated. SEM, XRD and TEM results showed that Ti-45Al-9(V, Nb, Y) alloys were mainly composed of γ, α 2 , and β phase, and the volume fraction of β phase increased with the increase of the atomic ratio of V/Nb. The alloys were featured with lamellar microstructure with β and γ phases locating at the colony boundaries, and some β precipitates appearing at γ/γ interfaces. It was found that the colony size decreased with the increase of x. The alloys exhibited moderate mechanical properties at room temperature, with a yield strength of over 600 MPa, and fractures showed mainly translamellar character. The alloy with x=3.5 exhibited the best deformability at elevated temperature and that with x=1 had superior oxidation resistance at 800 ℃. | Yang Fei Kong Fantao Chen Yuyong Xiao Shulong | 2010 | China Foundry2010，7，4： | 3 |
| 9 | A Glycal Approach to the Synthesis of Pregnane Glycoside P57显示文摘Pregnane glycoside P57 is known as an active component of Hoodia gordonii, which has long been used as a diet with appetite suppressantproperty. Chemical synthesis of P57 demands installation of β-cymarosyl linkage onto the steroid aglycone. The stereoselective formation of this specia1 2-deoxy-β-glycosidic linkage has previously been proven to be difficult and thus a limiting step in the synthesis of P57 and its congeners. Herein, we reportthe glycosylation reactions with glycals as donors and TPHB (triphenylphosphine hydrobromide) as promoter and a convergent synthesis of P57 via a β-selective glycosylation with a trisaccharide glycal donor. | Chao Liu Yuyong Ma Chengfeng Pei Wei Li Biao Yu | 2018 | Chinese Journal of Chemistry2018，36，11： | 3 |
| 10 | PREPARATION AND MICROSTRUCTURE OF NANO-SIZED Cu PARTICLES BY MECHANOCHEMICAL REACTION显示文摘1INTRODUCTIONThemetalparticlewithsizeof1~1000nmiscaledsuperfinemetalparticle.Sincethesuperfinemetalparticleshavesignificantp... | Wu Nianqiang, Su Lizhi, Yuan Mingyong , Liu Yuyong, Wu Jinming and Li Zhizhang Department of Materials Science and Engineering Center of Measure and Analysis, Zhejiang University, Hangzhou 310027, P. R. China | 1998 | 中国有色金属学会会刊:英文版1998，8，4： | 3 |
| 11 | Improvement of contact calculation in spherical discontinuous deformation analysis显示文摘Discontinuous deformation analysis solve(DDA)method is a newly developed the discrete element method which employs deal the implicit time-integration scheme to the governing equations low.and open-close spherical iteration(OCI)based method to with contact problem,its computational which efficiency very is relatively However,element has discontinuous deformation In analysis(SDDA),SDDA,uses simple contact type like point-to-point calculation contact,higher removing calculation speed.scheme the framework of the this paper presents a very simple(MDI).contact approach by the OCI that and by adopting maximal and displacement increment Through some verification obtained.examples,it is proved the proposed method is correct effective,and a higher computational efficiency | WANG Long JIAO YuYong HUANG GangHai ZHENG Fei ZHAO ZhiYe TAN Fei | 2017 | Science China(Technological Sciences)2017，60，5： | 2 |
| 12 | Experimental study on the influence of temperature cycle on low-rank coal permeability显示文摘The formation temperature is a key factor affecting coalbed methane(CBM)migration in reservoirs.Both the prediction of CBM production and prevention of mine gas disasters require the understanding on the controlling mechanism of temperature on coal permeability.We experimentally examined the evolution of permeability for natural low-rank coal samples under various stresses and cyclic temperature conditions.Apparent permeability and intrinsic permeability decrease significantly when the temperature increases and they only partially recover after the temperature returns.The permeability loss decreases greatly with the increasing number of temperature cycles.The permeability loss due to the rising temperature and the irreversible permeability loss for a whole temperature cycle decrease prominently with increasing confining stress.The impacts of swelling/shrinking of coal matrix,roughness of surface,pore compressibility and weakly bound water in coal on temperature sensitivity of coal permeability are investigated. | ZOU JunPeng JIAO YuYong RATHNAWEERA T D WANG Hao | 2020 | Science China(Technological Sciences)2020，63，6： | 2 |
| 13 | Genetic diversity and differentiation of masu salmon(Oncorhynchus masou masou) between and within cultured populations inferred from microsatellite DNA analysis显示文摘Masu salmon,Oncorhynchus masou masou,is one of the most valuable fishery species that has been introduced to China,though to date no studies on the genetic diversity and genetic relationship among hatchery populations has been performed with molecular markers.We undertook such a study and sampled 120 individuals from three hatchery stocks and analyzed 20 microsatellite loci.All loci were polymorphic and a total of 91 alleles were detected.A relatively low level of genetic diversity was revealed with effective number of allele of 3.1094,3.3299 and 3.1894 and expected heterozygosity of 0.6600,0.6648 and 0.6638 in the three stocks,respectively.Deviations from Hardy-Weinberg equilibrium were found due to heterozygote deficit.Accordingly,evidence of genetic bottlenecks were found in the three stocks.An individual assignment test demonstrated that 85% of individuals were correctly assigned into their original stocks.Pairwise Fst revealed that significant differentiation occurred between these three stocks.The results of the study indicated that disequilibrium of genetic structure and differentiation has occurred in all three stocks.This information collectively provides a basis for measures to avoid of loss of genetic diversity and introgression in Chinese aquaculture. | Zhiying JI Yuyong ZHANG Shuqiang CHEN Lianyu SHI | 2012 | Zoological Research2012，33，4： | 2 |
| 14 | Fabricating of Open-cell Porous Al-Si Alloy with Pressure Penetration Casting显示文摘Open-cell porous Al alloy was fabricated by pressure penetration casting. The fabrication ofpreform was studied in detail. When forming temperature is about 700℃ and binder contentis about 10%, preform with high compressive strength is obtained. Good porous Al alloy withpore size (0.5-1.6 mm) and porosity (60%-80%) can be obtained under 100℃ superheatingof liquid metal and about 1.0 MPa applied pressure. The size of the largest sample is up to100 mm in diameter and 100 mm in height. With the help of SEM it was found that the obtainedmaterial is a three-dimension open-cell porous structure with well-distributed and connected witheach other pores. Finally theoretical analysis was carried out to explain the efect of fabricatingprocess. | Xu, Qingyan Chen, Yuyong Li, Qingchun
| 1999 | Journal of Materials Science & Technology1999，15，1： | 2 |
| 15 | FLIGHT/THRUST INTEGRATED CONTROL USINGH∞SYNTHESIS IN AUTOMATIC CARRIER LANDING显示文摘The landing task of an aircraft under low aerodynamic pressure on carrier requires precise airplane control,A flight/thrust integrated control system(FTICS)with constant ad,actual angle of attack,is developed using LMI-based H∞synthesis.The typical single input/outputspecifications are translated into the weighting functions of an H∞output-feedback synthesis problem.The motiva-tion of the work is to improve the key performance of dy-namic tracking and air disturbance attenuation.The FTICS can keep the attitude andgle and the path angle un-changeable as the airplane is passing through the ramp at which the tracking radar doesnot work and the guidance signal is terminated.For engineering application,an or-der-reduction method of the H∞controller is also pro-posed,Simulational results indicate that the system satis-fies the design requirements quite well. | YuYong YangYidong DaiShijun | 2002 | Transactions of Nanjing University of Aeronautics and Astronautics2002，19，1： | 2 |
| 16 | Numerical modeling of the effects of joint orientation on rock fragmentation by TBM cutters显示文摘 | Gong QiuMing Zhao Jian Jiao YuYong | 2005 | Tunneling and Underground Space Technology2005，20，2： | 1 |
| 17 | Effect of yttrium on microstructure and mold filling capacity of a near-α high temperature titanium alloy显示文摘The addition of rare earth yttrium(Y) can improve the performances of high temperature titanium alloys,such as the tensile ductility,thermal stability and creep property,etc.However,few studies on the effect of Y on the castability of titanium alloys have been carried out,which is significant to fabrication of thin-walled complex titanium castings by investment casting.In this study,the microstructure and mold filling capacity of a Ti-1100 alloy with different Y additions(0,0.1wt.%,0.3wt.%,0.5wt.% and 1.0wt.%) were investigated systematically through investment casting experiments,and the casting experiments were carried out in a centrifugal titanium casting machine.The microstructures of the alloy were observed via the optical microscopy,scanning electron microscopy and transmission electron microscopy.The mold filling capacity was tested by using of a grid pattern and was evaluated by the number of segments completely filled by the cast alloy.The results indicate that the grain size is decreased and the mold filling capacity is improved significantly with increasing the addition of Y from 0 to 1.0wt.%.The average primary grain size of Ti-1100 alloy is reduced from 250 μm to 50 μm and the mold filling capacity is increased from 61.5% to 100%.Considering the potential harmful effect on tensile properties of titanium alloys due to high concentrations of Y,it is suggested that Y addition should be about 0.3wt.%. | Zhao Ertuan Chen Yuyong Kong Fantao Zhang Changjiang Xiao Shulong | 2012 | China Foundry2012，9，4： | 1 |
| 18 | Latest advances in discontinuous deformation analysis method显示文摘Discontinuous deformation analysis (DDA) method, proposed firstly by Shi [1] in 1988, is a novel numerical approach to simulate the discontinuous deformation behaviors of blocky rock structures. In DDA, the domain of interest is represented as an assemblage of discrete blocks and the joints are treated as interfaces between blocks. The governing equations of DDA are derived from Newton’s Second Law of Motion and the Principle of Minimum Potential Energy. In the calculation, the large displacement solution of a block is obtained through the procedure of time-step integration, and accordingly, the collapse process of a block system | JIAO YuYong ZHAO Qiang ZHENG Fei WANG Long | 2017 | Science China(Technological Sciences)2017，60，6： | 1 |
| 19 | Symptom characteristics and prevalence of qi deficiency syndrome in people of varied health status and ages: A multicenter cross-sectional study显示文摘Objective:Aging caused by a deficiency syndrome can be found in ancient and modern traditional Chinese medicine literature.Qi deficiency syndrome(QDS)is a vital factor in the aging process.This study aimed to establish a full-scale trial to evaluate the prevalence,symptom severity,frequency,and distribution of QDS in different age groups and varying health status to elucidate the role of qi deficiency in the aging process and deterioration of health.Methods:This cross-sectional study was conducted in four hospitals in China,and data from 1220 participants were included.The participants,aged between 20 and 79 years,completed questionnaires that recorded prevalence of QDS and severity or frequency of relevant symptoms,then were interviewed by investigators.We used frequency analysis and chi-squared tests to perform comparative analysis of prevalence in different age and health groups;we used a ranksum tests for quantitative analysis of symptoms severity and frequency scores;we performed a regression analysis of correlation between syndrome occurrence and potential factors using nonconditional binary logistic stepwise regression of numerical variables.P<0.05 was considered statistically significant.Results:Prevalence,symptom severity and frequency scores of QDS showed a rising trend when physical condition worsened,rather than when age increased.Health status,fatigue,shortness of breath or no desire to talk,spontaneous sweating,swollen tongue with teeth marks on side,and deficient and weak pulse,rather than increasing age were contributing factors to this syndrome.Distribution of QDS in certain health and age stages showed remarkable irregularities.Conclusions:Qi deficiency may be a contributing factor for sub-health(sub-optimal health)and chronic diseases rather than aging.It may play a crucial role in chronic disease pathogenesis of young and middle-aged people,and in sub-health pathogenesis of older adults.Recognition of the warning signs and symptoms of QDS may lead to early intervention and prevention of subhealth,and chronic diseases. | Yin Zhang Li Zhang Xia Zhao Yue Liu Shiyu Du Jian Li Ting Liu Fusheng Liu Zeqi Su Yuyong Jiang Xia Ding | 2015 | Journal of Traditional Chinese Medical Sciences2015，2，3： | 1 |
| 20 | Tribological behavior study on Ti–Nb–Sn/hydroxyapatite composites in simulated body fluid solution显示文摘 | Yuyong Chen Xiaopeng Wang Lijuan Xu Zhiguang Liu Kee Do Woo | 2012 | Journal of the Mechanical Behavior of Biomedical Materials2012，，： | 1 |
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