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| 1 | MICROSTRUCTURE EVALUATION OF SEMI-SOLID STEEL MATERIALS IN ROLLING PROCESS AND THE RESULTING MECHANICAL PROPERTIES显示文摘The experimental study on the familiar 60Si2Mn and lCrl8Ni9Ti materials rolled in the semi-solid state was carried out. Experimental results show that the segregation of liquid occurs when the semi-solid slurry is rolled, which influences the microstructure and mechanics performance of workpiece under room temperature. The globular solid particles don’t present plastic deformation unless high solid fraction. At the same time, the mechanics property of workpiece is pretty good while the semi-solid slurry of 1Cr18Ni9Ti material is rolled by a pass and no other treatment. | R.B. Song, Y.L. Kang, J.L. Sun, A.M. Zhao and W.M. Mao School of Materials Science & Engineering, University of Science & Technology Beijing, Beijing 100083,China | 2001 | Acta Metallurgica Sinica(English Letters)2001，14，5： | 17 |
| 2 | In Search of the Cretaceous-Tertiary Boundary in Heilongjiang River Area of China显示文摘Abstract A new geological section recognized in Baishantou of Jiayin, Heilongjiang Province, China, was studied preliminarily in searching for the K/T boundary. An early Paleocene florule characrerized by abundant Tiliaephyllum tsagajanicum leaves and its associated plants, was collected from the Baishantou Member (new member representing the lower part of the Paleocene Wuyun Formation) overlying the possible K/T boundary. A tuff bed was found from the upper part of the Furao Formation (uppermost Cretaceous) in this section. The new findings imply that the K/T boundary is probable lying in the interval between the base of the Baishantou Member and the tuff bed, based on the correlation of the present strata with the stratotype of the Tsagajan Group spanning the K/T boundary in 'Belaya Gara' of the Bureya Basin, Russia. The early Paleocene florule from the Baishantou Member and the early-middle Maastrichtian dinosaurs found from the Yuliangzi Formation underlying the Furao Formation suggest that the Baishantou section is more promising for searching for the K/T boundary in this area. Further studies of the section is needed, integrating paleontological, biostratigraphic, geochemical, paleomagnetic, and sedimentary research would benefit our understanding the mass extinction event and biotic recovery in the Heilongjiang River area, China, and even all of northeast Asia during the K/T boundary interval. | Sun G. M.Akhmetiev Dong Z.M. A.R.Ashraf Sun Y.W. E.Bugdaeva D.L.Dilcher L.Golovneva I.Harding K.Johnson T.Kezina T.Kodrul LU J.S. V.Markevich H.Nishida H.Okada Park S.O. Sun C.L. Xiong X.Z. Xing Y.L. Zhou Z.L. | 2002 | Global Geology2002，7，2： | 13 |
| 3 | LASER CLADDED TiCN COATINGS ON THE SURFACE OF TITANIUM显示文摘Laser cladded coatings of TiCN were produced on the surface of titanium. To obtain the optimal techniques, several conditions were tested by varying the laser scanning rate. The choice of shielding gas was also studied. The cladded coatings were then evaluated from the surface mechanics point of view based on their microhardness. The microstructure of some interesting samples was investigated by optical micrographs (OM). The results showed that under the condition of fixed pulse frequency and pulse width, the laser scanning rate and the shielding gas are the main factors influencing the components of coatings. TiCN coatings were decompounded and oxidized during the cladding process in the condition of no shielding gas of N2. X-ray diffraction results indicated that the composite coatings composed of TiCN, TiC, Ti2N, and TiO2 were produced using appropriate techniques. The results indicated that the best condition in terms of the surface microhardness is obtained when the scanning rate is 1.5mm / s, the pulse frequency is 15Hz, the pulse width is 3.0ms, and N2 is chosen as the shielding gas. The microhardness of the composite coatings is about 1331kg · mm - 2, which is about 4 times that of the substrate. The optical micrographs indicated that the cladding zone is made up of TiCN, TiO2, and some interdendritic Ti, but the diffusion zone mainly consists of the dendrites phase, and the cladded depth is about 80m, which is more than 2 times that of the laser nitrided sample. There were no microcracks or air bubbles in the cladded sample, which was cladded using the above optimal techniques. | Y.L. Yang D. Zhang H.S. Kou C. S. Liu | 2007 | Acta Metallurgica Sinica(English Letters)2007，20，3： | 13 |
| 4 | DIFFERENCE SCHEMES WITH NONUNIFORM MESHES FOR NONLINEAR PARABOLIC SYSTEM显示文摘The boundary value problem for the nonlinear parabolic system is solved bythe finite difference method with nonuniform meshes. The existence and a prioriestemates of the discrete vector solutions for the general difference schemes withunequal meshsteps are established by the fixed point technique. The absolute andrelative convergence of the discrete vector solution are justified by a series of apriori estimates. The analysis of mentioned problems are based on the assumptionof heuristic character concerning the existence of the unique smooth solution forthe original problem of the nonlinear parabolic system. | Y.L. Zhou(Laboratory of Computational Physics, Centre for Nonlinear Studies, Institute of AppliedPhysics and Computational Mathematics, Beijing, China) | 1996 | Journal of Computational Mathematics1996，14，4： | 12 |
| 5 | DESIGN AND PREPARATION OF SILICON NITRIDE COMPOSITE WITH HIGH FRACTURE TOUGHNESS AND NACRE STRUCTURE显示文摘DESIGNANDPREPARATIONOFSILICONNITRIDECOMPOSITEWITHHIGHFRACTURETOUGHNESSANDNACRESTRUCTUREYHuang;H.NHao;Y.L.ChenandB.L.Zhou(1)De... | Y Huang H.N Hao Y.L. Chen and B.L.Zhou (1)Department of Materials Science and Engineering, Tsinghua University,Beijing 100084, China 2)Institute of Metal Research, Chinese Academy of Sciences,Shenyang 110015, China ) | 1996 | Acta Metallurgica Sinica(English Letters)1996，9，6： | 12 |
| 6 | Molecular Mapping of Three Loci Conferring Resistance to Maize (Zea mays L.) Rough Dwarf Disease显示文摘Maize rough dwarf disease (MRDD) is a viral disease that is widely distributed in the world and causes great losses in grain yield. During the past three decades, considerable progress has been made in the | F. Wang Y.S. Zhang Y.L. Zhuang G.Z. Qin J.R. Zhang | 2007 | 分子植物育种2007，5，2： | 10 |
| 7 | MECHANICAL PROPERTIES OF LONGITUDINAL SUBMERGED ARC WELDED STEEL PIPES USED FOR GAS PIPELINE OF OFFSHORE OIL显示文摘自从发展近海油和煤气的、增加的海底的油和煤气的管道被安装。因为全面性质的严格的要求,海底的管道的所有早钢管子取决于进口,例如,耐蚀,等等迫使的抵抗。研究并且发展为海底的管道使用的国内钢管子,管子用钢盘子做的焊接的纵缝接的沉没的弧( LSAW )由 JCOE 和 UOE 从铺平的热卷的卷切了(在的形成的过程象信一样的板“ J ”,“ C ”,“ O ”或“ U ”形状,然后扩大)形成过程。而且,管子碱金属的机械性质和焊接金属被测试,并且结果根据相应管子说明 API 说明 5L 或 DNV-OS-F101,它证明国内 LSAW 管子能被用于海底的油和煤气的管道。 | Z.Z. Yang W. Tian Q.R. Ma Y.L. Li J.K. Li J.Z. Gao H.B. Zhang Y.H. Yang | 2008 | Acta Metallurgica Sinica(English Letters)2008，21，2： | 9 |
| 8 | Sequence assembly using next generation sequencing data —challenges and solutions显示文摘Sequence assembling is an important step for bioinformatics study.With the help of next generation sequencing(NGS)technology,high throughput DNA fragment(reads)can be randomly sampled from DNA or RNA molecular sequence.However,as the positions of reads being sampled are unknown,assembling process is required for combining overlapped reads to reconstruct the original DNA or RNA sequence.Compared with traditional Sanger sequencing methods,although the throughput of NGS reads increases,the read length is shorter and the error rate is higher.It introduces several problems in assembling.Moreover,paired-end reads instead of single-end reads can be sampled which contain more information.The existing assemblers cannot fully utilize this information and fails to assemble longer contigs.In this article,we will revisit the major problems of assembling NGS reads on genomic,transcriptomic,metagenomic and metatranscriptomic data.We will also describe our IDBA package for solving these problems.IDBA package has adopted several novel ideas in assembling,including using multiple k,local assembling and progressive depth removal.Compared with existence assemblers,IDBA has better performance on many simulated and real sequencing datasets. | CHIN Francis Y.L. LEUNG Henry C.M. YIU S.M. | 2014 | Science China(Life Sciences)2014，57，11： | 8 |
| 9 | Core Collection Based Backcrossing: An Eff icient Approach for Breeding, Germplasm Enhacement and Gene Discovery显示文摘Plant germplasm underpins much of crop development. Millions of germplasm accessions have been collected and conserved ex situ, and the major challenge is now how to exploit and utilize this abundant resource. | J.Z. Jia R.H. Zhou X.Y. Zhang L. Zhang Y.L. Li J. Wang X.Z. Liu L.F. Gao S.B. Liu | 2007 | 分子植物育种2007，5，2： | 8 |
| 10 | ELECTROCHEMICAL NOISE ANALYSIS OF PURE ALUMINUM IN SODIUM CHLORIDE SOLUTION WITH WAVELET TRANSFORM TECHNIQUE显示文摘Wavelet transforms (WT) are proposed as an alternative tool to overcome the limitations of Fourier transforms (FFT) in the analysis of electrochemical noise (EN) data. The most relevant feature of this method of analysis is its capability of decomposing electrochemical noise records into different sets of wavelet coefficients, which contain information about the time scale characteristic of the associated corrosion event. In this context, the potential noise fluctuations during the free corrosion of pure aluminum in sodium chloride solution was recorded and analyzed with wavelet transform technique. The typical results showed that the EN signal is composed of distinct type of events, which can be classified according to their scales, i.e. their time constants. Meanwhile, the energy distribution plot (EDP) can be used as 'fingerprints' of EN signals and can be very useful for analyzing EN data in the future. | Z. Zhang, Q.D. Zhong, J.Q. Zhang, Y.L. Cheng, F.H. Cao, J.M. and C.N. CaoDepartment of Chemistry, Zhejiang University, Hangzhou 310027, ChinaElectrochemical Research Group, Shanghai University of Electric Power, Shanghai 200090, ChinaState Key Laboratory | 2002 | Acta Metallurgica Sinica(English Letters)2002，15，3： | 7 |
| 11 | Bilayer expurgated LDPC codes with uncoded relaying显示文摘 | Md. Noor-A-Rahim Nan Zhang Sk. Md. Rabiul Islam Y.L. Guan | 2017 | Digital Communications and Networks2017，3，3： | 6 |
| 12 | Superelasticity and Tunable Thermal Expansion across a Wide Temperature Range显示文摘Materials that undergo a reversible change of crystal structure through martensitic transformation(MT)possess unusual functionalities including shape memory, superelasticity, and low/negative thermal expansion. These properties have many advanced applications, such as actuators, sensors, and energy conversion, but are limited typically in a narrow temperature range of tens of Kelvin. Here we report that, by creating a nano-scale concentration modulation via phase separation, the MT can be rendered continuous by an in-situ elastic confinement mechanism. Through a model titanium alloy, we demonstrate that the elastically confined continuous MT has unprecedented properties, such as superelasticity from below 4.2 K to 500 K, fully tunable and stable thermal expansion, from positive, through zero, to negative, from below 4.2 K to 573 K, and high strength-to-modulus ratio across a wide temperature range.The elastic tuning on the MT, together with a significant extension of the crystal stability limit, provides new opportunities to explore advanced materials. | Y.L. Hao H.L. Wang T. Li J.M. Cairney A.V. Ceguerra Y.D. Wang Y. Wang D. Wang E.G. Obbard S.J. Li R. Yang | 2016 | Journal of Materials Science & Technology2016，32，8： | 6 |
| 13 | 采用半主动摩擦阻尼器进行建筑结构综合振动控制和健康监测:第二部分——数值分析显示文摘在第一部分中提出的模型修正及采用半主动摩擦阻尼器进行建筑结构振动控制和损伤监测的综合程序的基础上,对所提程序的可行性和应用问题进行数值研究。首次在建筑案例中采用模型修正计划确定结构参数。对影响模型修正的噪声测量、不完全测量信息和阻尼器刚度进行评估。通过与具有相同局部反馈控制策略但没有Kalman过滤器以及具有全部反馈控制策略情况的对比,评估了带有Kalman过滤器,由局部反馈策略控制的半主动摩擦阻尼器建筑物地震响应的控制性能。确定适宜修正和振动控制模型的最优阻尼器刚度。最后,对不同损坏程度和有无噪声污染区域提出了两种破坏情形,以确保损伤监测方案的精确性。另外,对所提出的损伤监测方案与传统的敏感性方法进行对比,数值结果证明了综合程序的可行性。 | B. Chen and Y.L. Xu | 2008 | 钢结构2008，23，9： | 5 |
| 14 | Influence of Re on the Properties of a NiCoCrAlY Coating Alloy显示文摘MCrAlY can serve as stand-alone overlay coatings or bond coats in thermal barrier coating systems, and its properties play a vital role in determining the performance of these coating systems. In order to further understand the behavior of MCrAlY coatings, several NiCoCrAlY model alloys with different levels of Re (0.3 wt%, 6 wt%, and 9 wt%) were investigated. Microstructural observation showed the addition of Re promoted the precipitation of Cr-rich phases, such as α-Cr and σ. The presence of α-Cr lowered the coecient of thermal expansion (CTE) of the coating alloys, which could reduce the CTE mismatch at the scale-metal interface. The solid solution strengthening effect of Re is responsible for an increase in Rockwell hardness of the coating alloys. But the isothermal oxidation resistance at 1100oC was deteriorated due to the precipitation of brittle α-Cr phase, a phase of inferior oxidation resistance compared with β-NiAl and γ-Ni. | J.J. Liang H. We Y.L. Zhu X.F. Sun Z.Q. Hu M.S. Dargusch X.D. Yao | 2011 | Journal of Materials Science & Technology2011，27，5： | 5 |
| 15 | STUDY ON VERTICAL WATER TEMPERATURE MODEL FOR MIYUN RESERVOIR显示文摘According to the characters of the Miyun reservoir located in northeast Beijing, one dimensional method is used to establish the mathematical model of temperature for the reservoir. In this model the heat exchange between water surface and atmosphere, effective diffusion, inflows, outflows, and thermal advection are considered comprehensively. The effective diffusion coefficient, decay coefficient of short wave in water, etc. are calibrated based on the observed stratification data of 1991 in the reservoir. The mathematical model is verified well with the data of 1992. This model can be used to predict the temperature distribution along the vertical direction for the Miyun reservoir and other similar reservoir. | Li, Y.L. Chen, Y.C. Zhang, B.X. | 2000 | Journal of Hydrodynamics2000，12，4： | 5 |
| 16 | Elastic deformation behaviour of Ti–24Nb–4Zr–7.9Sn for biomedical applications显示文摘 | Y.L. Hao S.J. Li S.Y. Sun C.Y. Zheng R. Yang | 2006 | Acta Biomaterialia2006，，2： | 5 |
| 17 | Application of artificial neural networks for predicting the impact of rolling dynamic compaction using dynamic cone penetrometer test results显示文摘Rolling dynamic compaction(RDC),which involves the towing of a noncircular module,is now widespread and accepted among many other soil compaction methods.However,to date,there is no accurate method for reliable prediction of the densification of soil and the extent of ground improvement by means of RDC.This study presents the application of artificial neural networks(ANNs) for a priori prediction of the effectiveness of RDC.The models are trained with in situ dynamic cone penetration(DCP) test data obtained from previous civil projects associated with the 4-sided impact roller.The predictions from the ANN models are in good agreement with the measured field data,as indicated by the model correlation coefficient of approximately 0.8.It is concluded that the ANN models developed in this study can be successfully employed to provide more accurate prediction of the performance of the RDC on a range of soil types. | R.A.T.M. Ranasinghe M.B. Jaksa Y.L. Kuo F. Pooya Nejad | 2017 | Journal of Rock Mechanics and Geotechnical Engineering2017，9，2： | 5 |
| 18 | A study of the corrosion of aluminum alloy 2024-T3 under thin electrolyte layers显示文摘 | Y.L. Cheng Z. Zhang F.H. Cao J.F. Li J.Q. Zhang J.M. Wang C.N. Cao | 2003 | Corrosion Science2003，，7： | 4 |
| 19 | IMPROVING THE SURFACE PROPERTY OF TC4 ALLOY BY LASER NITRIDING AND ITS MECHANISM显示文摘激光和激烈的氮的混合技术被使用改进钛合金(TC4 ) 的表面坚硬。样品是有 6.5 × 1 的激光力量密度的 nitrided 0 5 W · c m −2, 从 100 各种各样的扫描速度到在 −1 的 500mm · m。氮气体被预热到 300 ° C 加速 nitriding 过程。一些感兴趣的样品与 XRD 方法(X 光检查衍射) 被测试分析氮化物的作文,并且 HV 的表面坚硬被测量。结果显示出那听和 Ti 2 N 与合适的 nitriding 参数在 Ti 合金的表面上被形成,但是锡是主要作文。表面坚硬到三次增加了,它从 269 的原来的价值到 794kg · m m −2 。混合技术的机制被激光力量和加速了 nitriding 过程的预热过程主要氮的激活考虑。nitridation 过程能被看作详细给的六步。由分析改进 TiAl 合金的表面性质的机制的结果由于二个因素显示出表面性质的改进:第一个原因是激光退火的结果,并且第二是锡的形成。 | Y.L. Yang G.J. Zhao D. Zhang C.S. Liu | 2006 | Acta Metallurgica Sinica(English Letters)2006，19，2： | 4 |
| 20 | CALCULATION OF 3-D TRANSIENT TEMPERATURE FIELD DURING LASER TRANSFORMATION HARDENING PROCESS显示文摘A three-dimensional transient heat transfer model for laser transformation hardening process has been developed in this paper. The finite size of the laser treated sample, the surface heat loss of the sample, the latent heat of phase transformation and the temperature dependence of thermal properties of materials were considered. The heat source was considered as a moving Gaussian heat flux with a constant velocity. Three-dimension unequally spatial grid explicit finite difference equations, alternating direction implicit finite difference equations and implicit finite difference equations were deduced respectively. Three programs to calculate the temperature field were developed using Fortran language. The transient temperature fields of C22, 42CrMo, C60 steel samples during laser transformation hardening process were calculated using these programs, and the widths and depths of laser transformation hardening zones were also predicted. C22, 42CrMo, C60 steel samples were treated by CO2 laser,the widths and depths of laser transformation hardening zones of these samples were also measured experimentally. The calculated widths and depths of laser transformation hardening zones are in good agreement with the experimental results. | L. W Zhang, R.S. Wang, J. Th.M.De Hosson, Y.L. Xia and F. G. Wang 1) The State Key Lab. for Materials Modification by Laser, Ion and Electron Beams, Dalian University of Technology, Dalian 116023, China 2) Department of Applied Physics, University of Gro | 2000 | Acta Metallurgica Sinica(English Letters)2000，13，2： | 4 |
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