基于UHF RFID的钻井传感器信息管理系统设计

现有的钻井传感器信息管理采用纸质报告、条形码、磁条识别等传统方式,可靠性低,效率不高,针对这些问题,研制基于UHF(Ultra High Frequency,UHF)RFID(Radio Frequency Identification,RFID)的钻井传感器信息管理系统,该系统将RFID技术、数据管理、信息网络化等技术综合应用到钻井传感器信息管理系统中,通过网络通报传感器的各项信息,为钻井传感器的管理、维护、检修等提供数据依据和技术支持,提高了钻井传感器信息现代化管理水平。     

基于EBSD系统的工业纯铁微观结构观测方法

简述了电子背散射衍射(EBSD)的技术原理和试样的制备工艺,简要说明了工业纯铁EBSD试样的制备过程和测试参数选择等。利用EBSD技术分析表征了未发生塑性变形的工业纯铁、发生塑性变形的工业纯铁以及塑性变形后回复再结晶的工业纯铁。通过数据处理分析,研究讨论了三种不同处理条件下的工业纯铁的组织变化规律,包括晶粒尺寸、晶粒取向、晶粒取向差和晶界特征等信息。通过实例进一步表明EBSD是材料微观组织结构表征中一种非常有效的分析手段。     

UHP在食品加工中的应用

超高压技术（Ultra High Pressure,uHP）是目前国际上最热门的食品加工技术之一,本文综述了超高压技术在肉品加工、水果加工、蔬菜加工、食品保藏中的应用,以及目前超高压技术存在的问题及展望。     

强激光冲击锻铝薄板的实验

进行了锻铝合金(LD31)薄板试样在短脉冲强激光冲击下的实验研究.结果表明:在强激光冲击下,试样发生显著的塑性变形,变形后轴截面形状为类圆锥形;试样塑性变形量随激光能量的增加而增加,随着试样的厚度增加而减小;在其他工艺参数相同的情况下,圆形试样比正方形试样更容易发生塑性变形;试样冲击变形区正反二面表面粗糙度值下降,表面光洁度得到明显提高;试样冲击区的硬度没有得到显著提高,这和冲击强化有着很大不同;当激光能量的增加或者试样厚度减薄到一定程度时,试样将发生层裂,从其断口的形貌来看,其断裂方式属于韧性断裂.     

高内涵筛选NF-kB信号通路的技术体系建立

NF-KB是参与免疫调节、炎症反应、肿瘤发生等过程重要的转录因子,在TNFa、IL-1β、LPS等因子诱导下NF-KB发生核转位并渺活其转录活性.尝试利用高内涵筛选(High Content Screerung,HCS)和RNA干扰(RNA interference,RNAi)技术建立NF-KB核转位高通量筛选体系,该体系的应用将有助于发现新的NF-KB信号通路调节因子,为免疫与肿瘤的机制研究提供线索.     

三杆桁架的弹粘塑性分析

对图1所示三杆桁架承受载荷P=P_0H(t)的弹粘塑性平衡问题进行了分析,结果表明桁架的变形可分为弹性变形、约束粘塑性变形、约束-自由粘塑性变形、自由粘塑性变形等四个阶段.     

第二届高分辨率对地观测学术年会征稿启事

1会议背景及主题高分辨率对地观测学术年会(China High Resolution Earth Observation Conference)是一个开放的学术交流平台.旨在交流思想观点,分享研究成果,营造学术氛围,进一步开拓思路,发现人才,推动理论创新和技术进步,促进产学研合作与交流,支持我国高分辨率对地观测事业持续健康发展.年会主题:精确感知、创新应用.     

Mg-Zn系高强度镁合金的研究进展

简单介绍了Mg-Zn系高强度镁合金的特性和发展历史,着重分析Mg-Zn二元合金组织研究的争论焦点,并阐述了Mg-Zn系多元合金的最新研究进展;讨论了塑性成形和热处理的研究热点:大比率挤压、大塑性变形(SPD)和快速凝固(RS)等塑性变形工艺大大提高了Mg-Zn系合金的力学性能,是扩大应用的关键;双级时效的低温预时效阶段会形成大量G.P.区,为后续时效析出相的析出提供形核核心,进而显著提高合金的力学性能等;最后指出Mg-Zn系合金时效强化机理研究、研发含稀土Mg-Zn系合金、研发新型廉价高强度镁合金和塑性变形工艺是将来研究的重点方向。     

塑性变形工艺在变形镁合金晶粒细化中的应用

综述了热挤压、轧制、大塑性变形挤压等不同塑性变形工艺在变形镁合金晶粒细化中的应用研究进展,认为目前变形镁合金发展的主要瓶颈是低加工速率导致相关产品的成本居高不下,未来将通过大尺寸半连续铸锭的多外场晶粒细化和细晶镁合金快速加工技术等予以解决。     

小鼠胚胎冷冻技术的研究进展

传统胚胎冷冻技术如OPS、冷冻环、冷冻帽、冷冻膜等,在胚胎复苏率和囊胚形成率、技术可行性、温度适用范围、冰冻和解冻速率等方面各具有其特定优缺点,在实际推广和应用中存在一定局限性。本文就新型微滴式玻璃化(Modified droplet vitrification,MDV)胚胎冷冻技术和高重量渗透摩尔浓度玻璃化(High osmolality vitrification,HOV)两种新型胚胎冷冻保存技术进行概述,并阐明胚胎冷冻保存及复苏发育过程中所受温度、饮食中植物雌激素、N-乙酰半胱苷酸等参数的影响。     

Toward the development of Mg alloys with simultaneously improved strength and ductility by refining grain size via the deformation process

Magnesium(Mg) alloys, as the lightest metal engineering materials, have broad application prospects.However, the strength and ductility of traditional Mg alloys are still relativity low and difficult to improve simultaneously.Refining grain size via the deformation process based on the grain boundary strengthening and the transition of deformation mechanisms is one of the feasible strategies to prepare Mg alloys with high strength and high ductility.In this review, the effects of grain size on the strength and ductility of Mg alloys are summarized, and fine-grained Mg alloys with high strength and high ductility developed by various severe plastic deformation technologies and improved traditional deformation technologies are introduced.Although some achievements have been made, the effects of grain size on various Mg alloys are rarely discussed systematically and some key mechanisms are unclear or lack direct microscopic evidence.This review can be used as a reference for further development of high-performance fine-grained Mg alloys.     

Toward the development of Mg alloys with simultaneously improved strength and ductility by refining grain size via the deformation process

Magnesium(Mg) alloys, as the lightest metal engineering materials, have broad application prospects.However, the strength and ductility of traditional Mg alloys are still relativity low and difficult to improve simultaneously.Refining grain size via the deformation process based on the grain boundary strengthening and the transition of deformation mechanisms is one of the feasible strategies to prepare Mg alloys with high strength and high ductility.In this review, the effects of grain size on the strength and ductility of Mg alloys are summarized, and fine-grained Mg alloys with high strength and high ductility developed by various severe plastic deformation technologies and improved traditional deformation technologies are introduced.Although some achievements have been made, the effects of grain size on various Mg alloys are rarely discussed systematically and some key mechanisms are unclear or lack direct microscopic evidence.This review can be used as a reference for further development of high-performance fine-grained Mg alloys.     

铝合金强变形固溶及其时效特性的研究进展

介绍了强变形固溶现象及其研究发展过程、铝合金强变形固溶研究中有待解决的基本问题和强变形固溶铝合金的时效特性．同时,指出了铝合金强变形固溶的应用前景．     

亚共晶白口铸铁热塑性变形的试验研究

本文采用高温压缩，高温扭转试验方法，研究了亚共晶白口铸铁的高温塑性变形能力：测定了温度与极限变形率以及温度与变形抗力的关系曲线，对热塑性变形后的组织进行了观察与分析。结果表明：亚共晶白口铸铁在８５０～１０００℃具有良好的塑性变形能力，热塑性变形后碳化物由网状变成断网状，孤立块状，从而可使亚共晶白口铸铁的韧性得到提高。     

Investigations of a nanostructured FeMnSi shape memory alloy produced via severe plastic deformation

Low-cost iron-based shape memory alloys (SMAs) show great potential for engineering applications. The developments of new processing techniques have recently enabled the production of nanocrystalline materials with improved properties. These developments have opened avenues for newer applications for SMAs. The influence of severe plastic deformation induced by the high-speed high-pressure torsion (HSHPT) process on the microstructural evolution of an Fe–Mn–Si–Cr alloy was investigated. Transmission electron microscopic analysis of the alloy revealed the existence of nanoscale grains with an abundance of stacking faults. The high density of dislocations characteristic of severe plastic deformation was not observed in this alloy. X-ray diffraction studies revealed the presence of ε-martensite with an HCP crystal structure and γ-phase with an FCC structure.     

Surface grain refinement mechanism of SMA490BW steel cross joints by ultrasonic impact treatment

Ultrasonic impact treatment (UIT) is a postweld technique for improving the fatigue strength of welded joints. This technique makes use of ultrasonic vibration to impact and plastically deform a weld toe and can achieve surface grain refinement of the weld toe, which is considered as the main reason for the improvement of fatigue strength. In this paper, the microstructure of the surface of a treated weld toe was observed by metallographic microscopy and transmission electron microscopy (TEM). The results show that UIT could produce severe plastic deformation on the surface layer of the weld toe and the maximum depth of plastic deformation extended to approximately 260 μm beneath the treated surface. Repeated processing could exacerbate the plastic deformation on the surface layer, resulting in finer grains. We can conclude that the surface grain refinement mechanism of SMA490BW welded joints is related to the high density of dislocation tangles and dislocation walls.     

钢/聚丙烯/钢复合板拉深中钢板变形有限元分析

用弹塑性大变形有限元方法模拟钢／聚丙烯／钢复合层板的拉深成形过程，揭示了两层钢板的塑性应变发展过程，分析了不同变形区域的塑性变形特征。对内层钢板，从板料中心沿径向依次处于非塑性变形状态、径向伸长类变形、周向压缩类变形状态。而对外层钢板，从板料中心沿径向则依次处于非塑性变形状态、周向压缩类变形状态、径向伸长类变形状态、周向压缩类变形状态。     

Deformation behavior during nanoindentation in Ce-based bulk metallic glasses

Recently, bulk metallic glasses (BMGs) have at- tracted a great deal of attention due to their extremely high strength, improved wear resistance and excellent corrosion resistance[1-7]. However, it is known that their structural applications are currently…     

基于分子动力学的纳米压痕形变过程模拟

采用分子动力学方法模拟了金刚石压头压入Fe基体的纳米压痕全过程．研究了加载和卸载时基体的原子组态、载荷一位移曲线以及位错的发射和变化．分析了基体的塑性形变机理．发现压人深度为0．69nm时出现位错．随压入深度的增加位错长大成环,基体塑性形变加剧．卸载过程中位错环不断减小,当压头恢复到起始位置后,基体中心残留有位错环,产生了永久塑性形变,位错环的存在是基体产生永久塑性形变的关键因素．