一种新型钛合金半固态锻造后的断裂行为研究

以新型钛合金Ti14为对象,对比研究常规和半固态锻造合金经不同时间热暴露后的室温拉伸性能,探讨热暴露后的断裂行为及其断裂机制。结果表明,半固态锻造试样热暴露后的强度均明显高于常规锻造试样,而塑性略低于常规锻造试样。常规锻造试样宏观断口三要素清晰可见,断口由细小的韧窝组成,韧窝密度较大;半固态锻造试样纤维区模糊,剪切唇区较大,断口为韧窝和解理的混合型断口,并伴随少量二次裂纹的出现。析出相的尺寸、形态、分布的差异是导致两种锻造态合金热暴露后断裂机制改变的主要原因。     

含La或Sm的BaNd_(2-y)R_yTi_(4+x)O_(12+2x)瓷的结构与性能

ＢａＯ－Ｎｄ２Ｏ３－ＴｉＯ２系富钛区含Ｌａ或Ｓｍ的陶瓷,ＸＲＤ、ＳＥＭ显微结构分析表明,其主晶相为Ｒ（Ｒ＝Ｌａ或Ｓｍ）取代Ｎｄ固溶体ＢａＮｄ２－ｙＲｙＴｉ５Ｏ１４和ＢａＮｄ２－ｙＲｙＴｉ４Ｏ１２,均属斜方晶系,并存在少量的次晶相Ｒ２Ｔｉ２Ｏ７、ＢａＴｉ４Ｏ９、Ｂａ２Ｔｉ９Ｏ２０等。富钛区ＢａＮｄ２Ｔｉ４＋ｘＯ１２＋２ｘ（ｘ＝０～１．４００）组分和含Ｌａ或Ｓｍ的ＢａＮｄ２－ｙＲｙＴｉ５Ｏ１４组分所组成的瓷料,介质损耗显著地降低,介电常数和电容温度系数遵从李赫涅德凯对数混合定律。     

焊接热输入对近焊缝区组织性能的影响

采用焊接热模拟技术模拟不同焊接热输入条件下,峰值温度为1 350℃时对应近焊缝区的组织和性能,并对母材进行宏观力学特性测试;对比分析不同焊接热输入条件下所得近焊缝区的组织和性能。结果表明:经过3种不同焊接热输入所得近焊缝区的组织均由板条状贝氏体和少量碳化物组成;随着焊接热输入的增加,近焊缝区组织晶粒变大,贝氏体板条束变粗变厚,析出的碳化物数量增多,并且强度降低、韧性增强,但总体上跟母材的性能基本一致;当焊接线能量为12 kJ/cm时近焊缝区达到最佳的强韧性匹配。     

C60 LB单分子膜的电光Pockels效应

用电光调制衰减全反射光谱技术研究了Ｃ６０与花生酸混合的ＬＢ单分子膜的Ｐｏｃｋｅｌｓ（普克尔）效应。测量得到Ｃ６０ＬＢ膜的二阶非线性光学系数χ（２）（－ω;ω,０）＝０．５×１０－１２ｍ／Ｖ（１．３×１０－９ｅｓｕ）。这一结果与用光学二次产生测量Ｃ６０热蒸发膜的χ（２）（－２ω;ω,ω）同一数量级。并利用单分子层模型计算了Ｃ６０分子的超极化率为β＝１．１×１０－３０ｅｓｕ。     

一种低成本城市停车诱导系统中区域性Zigbee网络的设计

为降低城市级停车诱导系统的建设、运营成本,提出一种无需建立管理控制中心的系统架构,采用LPC11C14和CC2530作为核心芯片设计了系统中的重要组成部分——区域性Zigbee网络。通过所开发出的测试系统的实验,表明该Zigbee网络可准确接收用户手机发出的停车请求,并能根据停车场内车位状态向用户反馈最佳车位信息,从用户发送请求到收到反馈信息的时间不超过10s。     

Development of CRT＇s corner cutting repair systems

CRT Corner cutting tube is considered as a definitive reject and will be sent to reclaim at all times. It caused lots of material loss. In this paper, a novel technology used to save CRTs corner cutting tube is presented firstly. A set of repair system has been successfully developed to repair CRTs corner cutting tube. Then, the process technology for corner cutting repair has been excogitated by empirical studies. Finally, the correlative performances of repaired tube are evaluated. The experimental results show that the quality of repaired tube has no difference with that of normal product. The repair yield has reached above 97 percent. This new technology has contributed to improving the production yield, reducing the material consumption and decreasing the cost of color CRT production.     

NdFeB永磁靶材溅射模拟

运用SRIM2006软件对Nd2Fe14B靶溅射过程进行了模拟,并就入射离子的入射能量和角度进行了分析,得到溅射产额与入射离子能量、入射角度以及溅射靶材的一般规律:1)溅射产额随着入射离子能量的增加而增加,在低能量区域增加很快,到了高能量区域增加变缓;2)溅射产额随着入射离子入射角度的增大逐渐增大,且在70°~80°出现极大值,如当入射离子的入射角度为75°,入射离子能量为7 keV时,溅射产额可达4.398(原子.离子–1);3)溅射原子的摩尔比与靶材原子摩尔比存在一定偏差,导致薄膜成分与靶材成分不一致。     

Optically synaptic films using spiropyran J-aggregates

Spiropyran SP1822 J-aggregate LB films show a non-linear photochromic response with a threshold against the incident light intensity of a CW dye laser. Using two laser beams operating below the threshold level intensity, the logic ‘AND’ function was found to be optically stored as an overlapping region of two incident patterns. We proposed the adoption of an LB film of spiropyran J-aggregates to store the memory matrix T_ijkl as an overlapping region of learning input pattern V_ij and multi-image input pattern V_kl in order to construct an optical neural network system based on Hopfield model.