基于DSP E1-16XS的硬件开发平台设计

介绍数字信号处理器E1-16XS开发平台的设计；详细说明该处理器和存储器的连接以及I／O的扩展方法，并配合相关的电路图加以说明，使读者能够快速了解该处理器平台的设计方法。最后针对PCB的布线问题提出一些建议。目前该开发板运行正常可靠。     

两株海洋聚球蓝细菌(Synechococcus spp.)的16s rDNA系统发生及生理生态特征分析

利用流式细胞仪分析了黄海近海水样中聚球蓝细菌(Synechococcus)种群的组成,发现主要由藻红蛋白含量不同的两个类群组成.流式细胞仪分选后,用SN培养基培养纯化得到两株聚球蓝细菌IOCAS0401和IOCAS0402.荧光显微镜下镜检,两株菌在蓝色激发光(450～490nm)下发橘红色荧光,并且IOCAS0401的荧光较IOCAS0402强.扫描电镜观察发现IOCAS0401呈椭圆形,长轴大约1.2μm;IOCAS0402近似球形,直径约0.6μm.吸收光谱的检测表明,两者都有叶绿素a和藻红蛋白的特征吸收峰.其中IOCAS0401有藻尿胆素(PUB)和藻红胆素(PEB)吸收锋,而IOCAS0402只有PEB的吸收峰,两者均无藻蓝蛋白(PC)吸收锋.通过16s rDNA测序分析,结果表明两株菌都位于MC-A中的clade II类群,与从日本海域分离获得的MBIC10224菌株有较高的亲缘关系,虽然这三株菌都归为clade II,但单独成一分支,表明它们带有明显的西太平洋特色.     

Investigations of ferritic/martensitic super heat resistant 11‐12 %Cr steels for 650 °C power plants

The investigations of advanced ferritic/martensitic 11–12 %Cr steels for 650 °C power plant components focus on the improvement of high‐temperature creep properties with respect to chemical composition. The claim of the DFG research work was the development of new heat‐resistant 12 %Cr ferritic‐martensitic steels with sufficient creep and oxidation resistance for a 650 °C application by using basic principles and concepts of physical metallurgy on the basis of the state of art and to overcome the usual trial and error industrial alloy development. Efforts are focussed on a 100,000h creep strength of 100MPa at 650 °C in combination with a sufficient corrosion resistance by a Cr content of 12 % with contents 4‐5 %W, 3.4‐5,5 %Co, V, B and 1 %Cu as well as the choice of Ta or Ti instead of Nb. The results demonstrate that the aim is not to realize with the used alloying concept. In the long term range all 12 %Cr melts have a lower creep rupture strength than the advanced 9 %Cr piping steel P92. A high creep strength could be reached with a 0.06 % Ta alloyed 11 %Cr melt, which is in addition alloyed with a higher C and B content and as well as with lower W and Co portions. The results indicate in accordance with the finding of other steel researcher that a lower Cr content allows more effectiveness for the alloying partners respectively for the generation of more stable precipitates.     

钒氮钢中铁素体等温形核规律的试验研究

采用Geeble 3500热模拟试验机，对比研究了钒氮钢、钒钢的等温相变特征。结果表明，在相变过程中，钒氮钢中铁素体形核总量和晶内铁素体形核数量都明显高于钒钢，分析认为，这与钒氮钢中V（C，N）的析出造成了铁素体形核位置的改变，同时也增加了形核位置密度有关，尝试用一种新的形核方式对此进行了描述。     

Effects of various environments on fatigue crack growth in Laser formed and IM Ti–6Al–4V alloys

The fatigue crack growth behaviors of Laser formed and ingot metallurgy (IM) Ti–6Al–4V alloys were studied in three environments: vacuum, air and 3.5% NaCl solution. Taking the Unified Fatigue Damage Approach, the fatigue crack growth data were analyzed with two intrinsic parameters, stress intensity amplitude ΔK and maximum stress intensity K_max, and their limiting values ΔK^* and . Fatigue crack growth rates da/dN were found increase with stress ratio R, highest in 3.5% NaCl solution, somewhat less in air and lowest in vacuum, and higher in IM alloy than in Laser formed one. In 3.5% NaCl solution, stress corrosion cracking (SCC) was superimposed on fatigue at R=0.9 for where K_max>K_ISCC, the threshold stress intensity for SCC. This and environment-assisted fatigue crack growth were evidenced by the deviation in fatigue crack growth trajectory (ΔK^* vs. curve) from the pure fatigue line where . Furthermore, the fractographic features, identified along the trajectory path, reflected the fatigue crack growth behaviors of both alloys in a given environment.     

CAV424倾角传感器的检测系统设计

在实验的基础上,提出一种设计差动电容传感器调理电路的新方法,引入AMG公司开发的将电容信号转换成电压信号的集成电路CAV424,以及CAV424在倾角传感器中的应用。另外,结合实例给出系统各部分的详细硬件原理图。     

The recovery and recrystallization of cold rolled V-W-Ti alloys

Several V-W-Ti alloys with about 50% reduction in thickness by cold rolling were isochronally annealed at temperatures from 100 to 1100 °C. Hardness was measured after the annealing. By comparison with V4Cr4Ti and V4Ti alloys, the V6WTi alloy was found to begin recovery at a temperature about 100 °C higher, while the full recrystallization temperature was around 900 °C for all of the alloys. Hardness decreased successively above 500 °C in V8W, as is the case in pure V. Impurity induced hardening was observed around 300 °C only in the alloys without Ti. Precipitation and the interaction between interstitial impurities and dislocations were supposed to be the main contributors to the different recovery and recrystallization behaviors of the alloys.     

基于无线数据传输的钢丝绳张力监测系统

介绍了一种用PICl6C73单片机控制的钢丝绳张力监测系统，由于矿井提升机工作环境的特殊性，检测的数据需要进行无线传输。给出了控制系统组成和工作原理．重点介绍了发送系统控制部分，给出了设计流程。该系统实现了低压无电缆线环境下的压力监测，提高了信号传输的可靠性和灵活性。它只需更换传感器和修改控制软件，就可以扩展到其他监控系统中。     

橡塑磁条在永磁音像微特电机中的应用

本文简述了橡塑磁条的制造工艺及在永磁音像电机规模生产中的应用，与铁氧体烧结磁环进行比较，阐述了橡塑磁条在音像微特电机中使用的优势。     

99Tcm(V)-DMSA与99Tcm-MIBI亲肿瘤显像在诊断甲状腺髓样癌中的对比

对62例甲状腺髓样癌(MTC)患者手术前行SPECT亲肿瘤显像,其中99Tcm(V)-DMSA显像组32例,99Tcm-MIBI显像组30例;并对两组患者早期和延迟影像的定性和半定量分析结果进行比较.结果显示两种显像方法对MTC原发灶诊断的阳性率无显著性差异(P＞0.05),但半定量分析结果显示99Tcm(V)-DMSA对原发灶显像的早期摄取比、延迟摄取比、滞留指数明显高于99Tcm-MIBI显像,差异有显著性(P＜0.001),提示99Tcm(V)-DMSA显像更具有优越性.