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effect of Annealing Temperature and Strain Rate on Mechanical Property of a Selective Laser Melted 316L Stainless Steel

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Acta Metallurgica Sinica(english Letters) 2022年第5期35卷 773-789页

作者： Hua-Zhen Jiang Zheng-Yang Li Tao Feng Peng-Yue Wu Qi-Sheng Chen Shao-Ke Yao Jing-Yu Hou School of engineering Science University of Chinese Academy of SciencesBeijing100190China Institute of Mechanics Chinese Academy of SciencesBeijing100190China Beijing e-Plus-3d Technology Co. LTDBeijing102299China

In the present work,316 L stainless steel specimens are fabricated by selective laser melting(SLM)via optimized laser process *** effects of two extrinsic factors,i.e.,strain rate and annealing temperature,on the mechanical performance of SLM-processed parts are *** two intrinsic factors,namely strain rate sensitivity m and work hardening exponent n,which control the tensile properties of the as-built samples,are *** structure characterizations show that cellular structure and crystalline grain exhibit apparently different thermal stability at 873 *** testing reveals that the yield strength decreases from 584±16 MPa to 323±2 MPa,while the elongation to failure increases from(46±1)%to(65±2)%when annealing temperature varies from 298 K to 1328 *** n value increases from 0.13 to 0.33 with the increase in annealing *** to the presence of fine cellular structures and high relative density achieved in as-printed 316 L samples,a strong dependence between tensile yield strength and strain rate is *** addition,the strain rate sensitivity of the SLM-produced 316 L part(m=0.017)is much larger than that of conventional coarse-grained part(m=0.006),whereas the n value increases slightly from 0.097 to 0.14 with increasing strain rate.

关键词： Selective laser melting 316L stainless steel Heat treatment Strain hardening behaviors Mechanical property

Rock engineering design of post-tensioned anchors for dams - A review

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Journal of Rock Mechanics and Geotechnical engineering 2015年第1期7卷 1-13页

作者： e.T. Brown Golder Associates Ply ltd. PO Box 1734 Milton Queensland 4064 Australia

High-capacity, post-tensioned anchors have found wide-spread use, originally in initial dam design and construction, and more recently in the strengthening and rehabilitation of concrete dams to meet modern design and safety standards. despite the advances that have been made in rock mechanics and rock engineering during the last 80 years in which post-tensioned anchors have been used in dam en- gineering, some aspects of the rock engineering design of high-capacity rock anchors for dams have changed relatively little over the last 30 or 40 years. This applies, in particular, to the calculations usually carried out to establish the grouted embedment lengths required for deep, post-tensioned anchors. These calculations usually make simplified assumptions about the distribution and values of rock-grout interface shear strengths, the shape of the volume of rock likely to be involved in uplift failure under the influence of a system of post-tensioned anchors, and the mechanism of that failure. The resulting designs are generally conservative. It is concluded that these aspects of the rock engineering design of large, post- tensioned rock anchors for dams can be significantly improved by making greater use of modern, comprehensive, numerical analyses in conjunction with three-dimensional （3d） models of the rock mass structure, realistic rock and rock mass properties, and the results of prototype anchor tests in the rock mass concerned.

关键词： dam engineering Post-tensioned anchorsRock engineering designGrout-tendon bondRock-grout bondRock mass uplift failure

Tissue-engineered Products for Skin Regenerative Medicine

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Open Journal of Regenerative Medicine 2016年第3期5卷 61-84页

作者： Yoshimitsu Kuroyanagi R & d Center Skin Regenerative Medicine Technosurg Ltd. Sagamihara Japan

In a general wound healing process, foreign bodies and tissue detritus have to be broken down and then a new tissue is produced. However, the new tissue formation sometimes fails to proceed under the impaired conditions such as burn injury and intractable skin ulcer. A major obstruction to wound healing is infection. Another obstruction to wound healing is deficiency of growth factors. The endogenous levels of growth factors are reduced in some chronic wounds. To improve these wound conditions, researchers have been trying to create several types of artificial skins. The tissue-engineered products include three prime constituents, i.e., cells, growth factors, and materials. In this review, the practical design of tissue-engineered products for skin regenerative medicine is introduced. The first design makes it possible to release silver sulfadiazine (AgSd) from a wound dressing. The second design makes it possible to release epidermal Growth Factor (eGF) from a wound dressing or a skin care product composed of hyaluronic acid spongy sheet containing bioactive ingredients. The third design makes it possible to release several types of growth factors from allogeneic fibroblasts within cultured dermal substitute. This tissue-engineered product is prepared by seeding allogeneic fibroblasts into a collagen and hyaluronic acid spongy sheet. Although allogeneic cells are rejected gradually in immune system, they are able to release some types of growth factors, thereby regenerating a damaged tissue. The clinical study demonstrates that these tissue-engineered products are promising for the treatment of burn injury and intractable skin ulcer.

关键词： Tissue engineering Wound dressing Cultured Skin Substitute Antimicrobial Agent Growth Factor

Recent Advances in Holey Fibers and Their Applications

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光学学报 2003年第S1期23卷 1-2页

作者： T.Hasegawa T.Saitoh d.Nishioka T.Hosoya e.Sasaoka Sumitomo electric Industries Ltd. 1 Taya-cho Sakae-ku Yokohama 244-8588 JapanSumitomo Electric Industries Ltd. 1 Taya-cho Sakae-ku Yokohama 244-8588 JapanSumitomo Electric Industries Ltd. 1 Taya-cho Sakae-ku Yokohama 244-8588 JapanSumitomo Electric Industries Ltd. 1 Taya-cho Sakae-ku Yokohama 244-8588 JapanSumitomo Electric Industries Ltd. 1 Taya-cho Sakae-ku Yokohama 244-8588 Japan

Transmission loss of holey fiber is found to depend on its structure, and to be caused by Rayleigh scattering at glass surface. Under this loss dependence, most promising is optical wiring application, for which fiber... 详细信息

关键词： in be on mode Recent Advances in Holey Fibers and Their Applications of PdI length than high

Correction to:effect of Process Parameters on defects,Melt Pool Shape,Microstructure,and Tensile Behavior of 316L Stainless Steel Produced by Selective Laser Melting

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Acta Metallurgica Sinica(english Letters) 2021年第4期34卷 511-513页

作者： Hua-Zhen Jiang Zheng-Yang Li Tao Feng Peng-Yue Wu Qi-Sheng Chen Yun-Long Feng Long-Fei Chen Jing-Yu Hou He-Jian Xu School of engineering Science University of Chinese Academy of SciencesBeijing100190China Institute of Mechanics Chinese Academy of SciencesBeijing100190China Beijing e-Plus-3d Technology Co. LTDBeijing102299China

In the Original Publication of the article,some reference numbers in the Figs.1,5,14 and Appendixes B,C,d are *** corrected reference numbers in the figures and appendixes are given below.

关键词： Microstructure defects 316L

Influence of the electroplating pretreatment on corrosion mechanism of NdFeB magnets

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Journal of Rare earths 2016年第2期34卷 152-157页

作者：周巧英李刚刘壮郭帅闫阿儒李东李建忠 Key Laboratory of Magnetic Materials and devices Ningbo Institute of Material Technology and Engineering Chinese Academy of Sciences Ningbo Permanent Magnetics Co. Ltd.

The electroplating pretreatment of NdFeB magnets was simulated in this study, and the effect of the pickling process on element, matrix morphology and texture was discussed. The results showed that in the ordinary circumstance the acid solution con-centration should be below 4 mol/L and the pickling time was within 120 s. However the concentration was lower than 1 mol/L and the time was about 30 s in the ultrasonic environment. The precoating technology sequentially was studied. The results revealed that there were two main reactions of the corrosion and displacement in the precoating process, and these two reactions were more obvi-ous in the grain boundary. The electrochemical analysis illustrated that the corrosion and displacement reactions were affected obvi-ously by the current density and the precoating solution temperature, usually the current density was controlled about 0.3 A/dm2, and the temperature was about 318 K in the precoating process.

关键词： NdFeB magnet pickling precoating corrosion pretreatment rare earths

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利用铸坯表层组织控制预防横向裂纹发生

利用铸坯表层组织控制预防横向裂纹发生

SYNdIOSPeCIFIC POLYMeRIZATION OF STYReNe WITH Ar[O,O/NH]Cp ~*TiCl ACTIVATed WITH MMAO

2005中国钢铁年会

作者： Toru KATO Noriaki BABA Yoshiki ITO Akihiro YAMANAKA corporate R＆d Labs. Sumitomo Metal Industries Ltd. Japan Kashima Steel Works Sumitomo Metal IndustriesLtd.Japan corporate R＆d Labs. Sumitomo Metal IndustriesLtd.Japan corporate R＆d Labs. Sumitomo Metal IndustriesLtd.Japan

板坯的表面横裂多发现于连铸的弯曲或矫直处,并与γ-α相变温度区域的热延性有关。许多研究表明,裂纹是由于晶界处片层状铁素体的应变集中所导致的。在传统流程中的弯曲矫直期间,板坯的表面温度主要考虑来避开脆化温度区的。在该研究中... 详细信息

板坯的表面横裂多发现于连铸的弯曲或矫直处,并与γ-α相变温度区域的热延性有关。许多研究表明,裂纹是由于晶界处片层状铁素体的应变集中所导致的。在传统流程中的弯曲矫直期间,板坯的表面温度主要考虑来避开脆化温度区的。在该研究中,提出了一个新的概念:利用铸坯表层微观组织控制来预防横向裂纹。通过板坯表层组织控制（SSC）能够抑制晶界处片层状铁素体的形成,方法有二冷区初期的强冷却和随后的潜热引起的再加热。现场的凝固高温拉伸试验证明,通过微观结构控制可以消除脆性极限。SSC对裂纹敏感性的影响已经通过半工业化连铸机在试验上得到了验证。在浇铸之后进行的是弯曲。在钢坯表面上的慢冷使横裂纹在实验上再现,即传统冷却方式可以产生具有片层状铁素体的正常微观结构。通过表层组织控制（SSC）裂纹是可以预防的。传统连铸也可采用这些操作方法。

关键词：连铸横裂纹二次冷却微观结构热延性析出物低合金钢

来源： cnki会议评论

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Chinese Journal of Polymer Science 2009年第5期27卷 659-665页

作者：陈劼 Haerbin Institute of Technology Postdoctoral Station of School of Materials Science and engineering daqing Oilfield Company ltd. Exploration and Development of Research Institute

A series of titanium complexes Ar[O,e]Cp~*TiCl(Cp~*=C_5Me_5,Ar=1,2-phenylene,e=NH(1a);Ar=1,2- phenylene,e=O(1b);Ar=2.2'-diphenylene,e=O(1c);Ar=2,2'-dinaphthalene,e=O(1d)) has been prepared by the reaction of corresponding phenol derivatives with Cp~*TiCl_3 in the presence of excessive *** the conditions of low Al/Ti molar ratio(e.g.500) and high reaction temperatures(>70℃),all the titanium complexes display higher catalytic activities towards the syndiospecific polymerization of styrene,in t...

关键词： Ziegler-Natta polymerization Catalysts Syndiotactic Polystyrene.

Optical experimental solution for the multiway number partitioning problem and its application to computing power scheduling

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Science China(Physics,Mechanics & Astronomy) 2023年第9期66卷 15-22页

作者： Jingwei Wen Zhenming Wang Zhiguo Huang dunbo Cai Bingjie Jia Chongyu Cao Yin Ma Hai Wei Kai Wen Ling Qian China Mobile(Suzhou)Software Technology Company Limited Suzhou 215163China Beijing QBoson Quantum Technology Co. Ltd.Beijing 100015China

Quantum computing is an emerging technology that is expected to realize an exponential increase in computing power. Recently,its theoretical foundation and application scenarios have been extensively researched and explored. In this work, we propose efficient quantum algorithms suitable for solving computing power scheduling problems in the cloud-rendering domain, which can be viewed mathematically as a generalized form of a typical NP-complete problem, i.e., a multiway number partitioning *** our algorithm, the matching pattern between tasks and computing resources with the shortest completion time or optimal load balancing is encoded into the ground state of the Hamiltonian;it is then solved using the optical coherent Ising machine, a practical quantum computing device with at least 100 qubits. The experimental results show that the proposed quantum scheme can achieve significant acceleration and save 97% of the time required to solve combinatorial optimization problems compared with classical algorithms. This demonstrates the computational advantages of optical quantum devices in solving combinatorial optimization problems. Our algorithmic and experimental work will advance the utilization of quantum computers to solve specific NP problems and will broaden the range of possible applications.

关键词： quantum algorithm coherent Ising machine multiway number partitioning problem