车削工件表面粗糙度在机视觉测量的照明技术

照明技术对车削工件表面粗糙度在机视觉测量具有重要意义,不同的照明方法会得到不同的测量结果。为寻求最合适的照明方法,分别用不同颜色和不同角度的光源为工件提供照明进行实验,并对获取的图像进行二值化处理。最后,通过对处理结果进行对比分析,得出较为合适的照明方法,为车削工件表面粗糙度在机视觉测量提供照明方案。     

精密薄壳塑件注射模设计

分析了学习电脑电池盒盖薄壳塑件的成型工艺,并设计了成型该塑件的注射模.模具结构紧凑、动作可靠、操作简单、生产效率高,有效地解决了薄壳塑件成型中易起皱易翘曲的难题,为同类塑件的成型提供了一定的参考.     

基于AB 1756系列PLC的高炉煤气净化系统

介绍了高炉煤气净化除尘系统的特点,以及为高炉配套的煤气净化自动控制系统的组成、特点、保证的功能。自动控制系统利用罗克韦尔1756系列PLC,设计了功能强大、操作简便的自动化控制系统,实现了工业生产的安全可靠运行。     

汽车覆盖件模具设计与制作

概述了汽车覆盖件模具设计与制造的发展现状,重点阐述了 CAD/CAE /CAM 设计技术、汽车覆盖件模具设计制造的并行工程和汽车覆盖件模具设计制造的逆向工程     

交联型醋丙乳液用于汽车滤纸的增强

使用共聚和交联共用的方法对汽车滤纸用醋丙乳液增强剂进行改性,研究了体系中甲基丙烯酸甲酯(MMA)、丙烯酸(AA)、N-羟甲基丙烯酰胺(NMA)和三聚氰胺甲醛树脂(MF)用量对浸渍后滤纸强度性能的影响。结果表明,在MMA用量20%(质量分数,下同)、AA用量3%、NMA用量5%、MF用量4%时,改性醋丙乳液可赋予滤纸优良的强度性能,同时保持滤纸优良的孔隙结构和透气性。     

Polyphenol compounds in artichoke plant tissues and varieties

Polyphenol compounds, particularly caffeoylquinic acids and flavonoids, were measured in different tissues and developmental stages of 6 artichoke varietal types diffused in the Mediterranean region. Flower heads were subdivided into external, intermediate, internal bracts, and receptacle, while leaves were collected at the vegetative and productive stages. The main polyphenols detected were chlorogenic acid, cynarin, luteolin 7-O-rutinoside, and luteolin 7-O-glucoside. "Violet de Provence" artichoke proved to retain the highest content of total phenols. Single polyphenols accumulated preferentially in specific parts of capitula. In leaves, most polyphenols were detected in the productive stage of the plant. Altogether, results provide useful indications for the promotion of artichoke as nutraceutical food and for the extraction of health-promoting substances in particular tissues/stages of the artichoke plant. PRACTICAL APPLICATION: We describe the content of phenolic compounds in various artichoke tissues, developmental stages, and varieties. Results indicate that artichoke leaves represent an important source of these health-promoting compounds, also useful for phytopharmaceutical applications. A wider utilization of specific artichoke types should be strongly encouraged not only as a food for the fresh market, as they are now used, but also for the pharmaceutical industry, since the content of phenolic compounds is abundant both in the heads and in the leaves.     

Silicate-based polymer-nanocomposite membranes for polymer electrolyte membrane fuel cells

Proton-exchange membrane fuel cells have emerged as a promising emission free technology to fulfill the existing power requirements of the 21st century. Nafion^® is the most widely accepted and commercialized membrane to date and possesses excellent electrochemical properties below 80 °C, under highly humidified conditions. However, a decrease in the proton conductivity of Nafion^® above 80 °C and lower humidity along with high membrane cost has prompted the development of new membranes and techniques. Addition of inorganic fillers, especially silicate-based nanomaterials, to the polymer membrane was utilized to partially overcome the aforementioned limitations. This is because of the lower cost, easy availability, high hydrophilicity and higher thermal stability of the inorganic silicates. Addition of silicates to the polymer membrane has also improved the mechanical, thermal and barrier properties, along with water uptake of the composite membranes, resulting in superior performance at higher temperature compared to that of the virgin membrane. However, the degrees of dispersion and interaction between the organic polymer and inorganic silicates play vital roles in improving the key properties of the membranes. Hence, different techniques and solvent media were used to improve the degrees of nanofiller dispersion and the physico-chemical properties of the membranes. This review focuses mainly on the techniques of silicate-based nanocomposite fabrication and the resulting impact on the membrane properties.     

汽车点火器用厚膜电路制造工艺探究

叙述了汽车点火器用厚膜电路生产工艺的开发与试制过程,确定了汽车点火器用厚膜电路的生产工艺,为实现汽车点火器的国产化奠定了基础。     

圆筒件展开公式的反向推导

冲压拉深圆筒件的展开公式,原是以圆筒件表面积和圆板坯料面积相等为原则,由圆筒体分解成几个简单几何图形并计算其面积之和推导出来的,称为正向推导。引入林政武先生提出的"环料基本面积消化率"的概念,并从这个拉深变形新概念推导出圆筒件的展开公式,称之为反向推导。     

宁夏菜心不同部位发酵理化品质及挥发性风味物质的分析

为探究宁夏菜心湿态发酵的可行性,该研究通过对宁夏菜心基部茎、顶端茎、叶子以及菜心整体进行乳酸菌接种发酵,解析发酵前后微生物、有机酸、亚硝酸盐、抗氧化能力、生物胺以及挥发性风味物质的变化规律。研究表明,发酵后菜心各部位总有机酸含量升高、亚硝酸盐含量降低、抗氧化能力降低和生物胺含量降低,基部茎、叶子、整颗菜心的挥发性性风味物质种类含量均升高;菜心叶子经发酵后亚硝酸盐含量和生物胺含量分别降解了0.30和22.78 mg/kg,DPPH自由基清除率62.06%,总有机酸含量3 212.70 mg/100 g,挥发性风味物质种类丰富,检出48种化合物,相对含量为123.68 g/g。与其他发酵组相比,叶子发酵组的理化指标和挥发性风味物质含量均处于较优水平。以上研究表明宁夏菜心可作为泡菜发酵的原材料,且较优发酵部位是叶子,该研究为菜心的湿态发酵奠定基础。