机械加工技术中的数控加工运用分析

随着人们生活水平不断提升,对于各个行业的技术内容也有着更高的要求,在进行机械设备的加工过程中往往存在一系列影响因素,此类因素最终会影响到整体的加工质量。对于相关行业内的从事人员来说就需要采取一定的技术手段和策略来对其进行处理和解决,从而有效提高机械教工的质量和效率。目前可以应用数控技术来达到这样的效果,数控技术也是当前机械设备发展转型的一个重要因素。     

Peptide Assembly of Al/CuO Nanothermite for Enhanced Reactivity of Nanoaluminum Particles

Biological self-assembly procedures, which are generally carried out in an aqueous solution, have been found to be the most promising method for directing the fabrication of diverse nanothermites, including Al/CuO nanothermite. However, the aqueous environment in which Al nanoparticles self-assemble has an impact on their stability. We show that using a peptide to self-assemble Al or CuO nanoparticles considerably improves their durability in phosphate buffer aqueous solution, with Al and CuO nanoparticles remaining intact in aqueous solution for over 2 weeks with minimal changes in the structure. When peptide-assembled Al/CuO nanothermite was compared with a physically mixed sample in phosphate buffer for 30 min, the energy release of the former was higher by 26%. Furthermore, the energy release of peptide-assembled Al/CuO nanocomposite in phosphate buffer showed a 6% reduction by Day 7, while that of the peptide-assembled Al/CuO nanocomposite in ultrapure water was reduced by 75%. Taken together, our study provides an easy method for keeping the thermal activity of Al/CuO nanothermite assembled in aqueous solution.     

柴达木盆地油泉子储油构造分析

通过对野外露头、地震反射剖面和钻井资料的综合分析,查明柴达木盆地油泉子储油构造为共轭膝褶带夹持的不对称半箱状背斜,具有北北东倾的平直转折端,北翼为一宽超过800m的大型膝褶带,高角度倾向南南西,带内岩层产状直立。带内岩层的旋转指示南侧沿膝褶带向北逆向剪切。南翼发育四条规模较小的膝褶带,向南逆冲剪切,导致该翼呈阶梯状产出,总体南南西倾,倾角约20°。沿南北两翼膝褶带边界仅见小型高角逆断层,膝褶带内裂隙发育,主要为顺层张裂隙,其次为与层理近垂直的张裂隙(主要出现在坚硬的钙质粉砂岩中),偶尔见有小型低角逆冲断层。这些断裂普遍被纤维状石膏充填,并见少量油迹,表明这些断裂为高流体压力下的产物。鉴于膝褶带及相关背斜高点为裂隙发育带,具有油气运移和聚集的双重功能,在缺乏足够理想的岩性储集层的情况下,为寻找裂隙型油气藏提供了新途径。     

Occurrence and characteristics of Vibrio vulnificus in retail marine shrimp in China

Vibrio vulnificus is a gram-negative bacterium that naturally occurs in estuarine waters and marine environment. Consumption of seafood contaminated with V. vulnificus or exposure to the contaminated water causes septicemia, gastroenteritis or wound infections in humans. This study aimed at identifying the prevalence of V. vulnificus in shrimps in Chinese seafood market. From June to September 2009, 239 samples encompassing six shrimp species were collected from ten cities in China. To quantify the prevalence and the levels of V. vulnificus in shrimps, the most probable number (MPN) method was used combining with the polymerase chain reaction (PCR) which was used to classify the isolates by detecting V. vulnificus hemolysin gene (vvhA). One hundred and forty out of 239 samples were positive for V. vulnificus, with the geometric mean level at 153.3 MPN/g. The prevalence and levels of V. vulnificus in shrimps varied in different geographic areas, with the values for the samples in the South cities (179.6 MPN/g) remarkably higher than that in the North cities (7.6 MPN/g). In addition, we found that 61.7% (79/128) of the V. vulnificus positive samples contained C-type (Clinical) strains and 8 contained E-type (Environmental) strains. The antimicrobial susceptibility of the isolates to 12 antibiotics was tested as well. Most of the 169 isolates remained susceptible to the majority of antimicrobials tested, whereas some strains tend to be less sensitive to amikacin, ampicillin, tetracycline and gentamicin. In conclusion, V. vulnificus is commonly found in retail marine shrimp in Chinese seafood market, and most of the shrimp samples contained C-type strains, which may pose a potential threat to human health.     

健美操教学中美感教育的频数统计分析

健美操的产生与发展是一个渐进的过程,它起源于人类对人体健与美的追求,健美操的发展史与人类审美观的形成是密切相关的,而美感是健美操教学和研究中与美的本质紧密相关的一个重要的问题。文中从美感的定义出发,从美学、教育方法论等多个角度详细阐述了健美操教学中的美感教育,并进行了丰富的实践统计。     

Enhancing Physicochemical Properties and Indium Leachability of Indium-Bearing Zinc Ferrite Mechanically Activated Using Tumbling Mill

The synthetic indium-bearing zinc ferrite (IBZF) was activated mechanically using a tumbling mill under different rotation speeds, milling times, media fillings, and ball-to-material ratios. Subsequently, the changes in the physicochemical properties and leaching behavior of IBZF induced by mechanical activation were studied by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectra (FT-IR), M?ssbauer spectrometry, particle size analysis, and leaching tests in sulfuric acid. The results showed that different milling conditions could form different particle size distribution, morphologies, and crystal structures, which influenced indium extraction differently. In addition, the indium extractions from various activated samples were related closely to the changes of physicochemical properties induced by mechanical activation. The strengthening effect of mechanical activation in IBZF decomposition lies mainly in the damage of crystal structure besides the decrease of the particle size because the indium-leaching efficiencies increased significantly with the increase of the damage of the crystal structure when the particle size is kept constant.     

新型环氧树脂泡沫塑料制备及其性能研究

采用两步法制备环氧(EP)树脂泡沫塑料,并对其结构和性能进行了表征。结果表明,EP固化完全,观察不到827cm-1处环氧基的特征峰。所得的EP泡沫塑料为闭孔结构,泡孔均匀,密度最低可达0.14g/cm3,玻璃化转变温度为107℃,起始分解温度为352.5℃。     

学习实践科学发展观的思考

以上海市政工程设计研究总院为例,论述了与时俱进,增强科学发展需要解决的认识问题;分析了转变发展方式,谋求更大发展空间的工作重点;提出了加大政策引导和资源整合力度,抓好基层党建工作和企业文化建设的措施。     

频谱分析仪在测量过程中的优化使用

为了在测量中高效使用频谱分析仪,需要对其进行优化设置。主要阐述了如何在测量过程中根据测试目的优化设置频谱分析仪相关参数和状态,以获得高的测量精度、快的测量速度和大的动态范围从而达到优化使用频谱分析仪、提高测量效能的目的。     

一种新型高压可控电抗器的特性与应用

介绍了一种磁阀式结构设计、低压直流控制新型高压可控电抗器的特性,详细说明由新型可控电抗器组成的静止补偿装置的应用。