发泡促进剂计量供料系统的设计

乳化炸药连续生产中各组分配比的自动控制是微机监控系统的基本功能。文中介绍了一种对敏化工序发泡促进剂的微量供料实现微机监控的途径,包括流量传感器的选定和测量及控制系统的设计。认为采用称重式计量方法的实用性较好。     

稀土复合作用下常温磷化工艺的研究

研究出一种含稀土和淀粉的常温磷化促进剂。探讨了稀土化合物、促进剂、磷化工艺参数如温度、时间和pH值对所得磷化膜外观、膜重和耐蚀性的影响。 结果表明：采用含稀土化合物的磷化促进剂,磷化膜的耐蚀性得到显著提高。     

火场助燃剂残留快速鉴别方法

采用傅立叶红外光谱仪对模拟火场纸张碎片中残留柴油进行测定,将所得的谱图信息结合计算机辅助方法进行一阶导处理-归一化匹配,运用计算机应用软件对特征区域的特征峰与新鲜柴油进行相似度计算,相似度为0．9046,均大于与其他几种助燃剂的匹配相似度,具有专一性和有效性。实验结果表明,傅立叶红外结合计算机辅助技术能够有效快速的鉴别火场残留助燃剂的种类。     

脉冲电浮法在矿物浮选中的应用理论研究

我国低品位难选矿石是重点开发资源。特别是低品位难选矿石,目前通常采用压热氧化、细菌氧化等技术进行选矿,但这些选矿方式多用于浮选精矿。提高浮选回收率是处理低品位难选矿石的第一关。电化学浮选技术作为浮选技术中的新发展方向,它的深入研究和推广将十分有利于低品位难选矿石的开发利用。     

高效异辛酸钒促进剂的研究

本文对异辛酸钒、异辛酸钴和环烷酸钴三种促进剂进行了试验对比,表明异辛酸钒促进剂各方面性能都优于异辛酸钴和环烷酸钴促进剂。     

Influence of liquid accelerant on scaling behavior of stainless steel in fire: An experimental study

Among the commercial materials, stainless steel is widely used in our daily life and can be hardly destroyed by flame or the heat emanating from a fire. In this fundamental work, the formation and development of oxide scale on stainless steel 1Cr11Ni2W2MoV were investigated at 600°C to 800°C in the atmospheres with and without liquid accelerant. The aim of this work is to figure out the influence of accelerant on the oxidation pattern of stainless steel at high temperature that occurs in a fire. The morphology, microstructure, and the growth rate of the oxide scales were characterized by thermogravimetric analysis, visual analysis, scanning electron microscopy, energy‐dispersive spectroscopy, and X‐ray diffraction. The results revealed that the oxide scale formed on the stainless steel 1Cr11Ni2W2MoV was mostly protective in both atmospheres from 600°C to 800°C, except that breakaway oxidation occurred locally that resulted in the formation of intrusion oxide. Both increasing temperature and the presence of kerosene in combustion atmosphere increased the mass gain of stainless steel, which was mainly attributed to the occurrence of local breakaway oxidation. Consequently, the addition of accelerant just increased the formation trend of local intrusion oxide, rather than remarkably affect the scaling behavior. Therefore, careful analysis is needed to identify the presence possibility of accelerant in oxidation atmosphere according to the scaling behavior of stainless steel. Characterization of surface scale and metallurgical analysis of metallic material are expected to be supplementary technique for fire characterization in the future.     

酵母天然自溶促进剂筛选

以酵母为研究对象,采用纸片法筛选抗菌物质,七叶一枝花、桔梗、大黄、牛蒡子、八角茴香、秦皮具有抗菌活性。抗菌物质促进菌体蛋白降解为水溶性蛋白,并提高菌体破坏细胞结构相关酶的活性;对将蛋白质完全水解成氨基酸的相关蛋白酶活性影响小,七叶一枝花还有一定抑制作用。八角茴香用量少时,可溶性蛋白含量随着八角茴香水提液用量增加而增加,桔梗对菌体细胞结构破坏相关酶活性的激活作用容易达到饱和,桔梗、八角茴香药食兼用,适合作为酵母天然自溶促进剂。     

GaAs PHEMT器件高温加速寿命试验及物理分析

GaAs微波器件的退化与金属化稳定性密切相关,实现PHEMT器件功能的金属化主要有栅金属化、欧姆接触金属化和信号传输线金属化。本文针对定制的GaAs PHEMT器件的栅金属接触孔链和欧姆接触金属方块条进行了高温加速应力寿命试验,并对器件金属化失效单机理进行寿命预计,同时对试验后的样品进行物理分析。结果显示栅金属接触孔链在180℃下就发生失效,接触孔链表面的金属化层形变,金属化发生了迁移;而AuGeNi欧姆接触在225℃高温下更易发生电迁移失效,金属向体内扩散并在金属条上形成空洞。     

超声波提取番茄红素新工艺研究

首次研究发现了试剂A促进番茄红素提取效率的新工艺,在此基础上采用超声波提取能进一步提高番茄红素的提取效率和缩短提取时间。在加入0.4%(w/w)的试剂A、pH为6～7、1:1(w/v)的料液比的条件下,采用超声波提取4min,能使番茄红素的一次提取率比不用超声波的提取率高出25.2%,并将提取时间从150min缩短到4min;在采用超声波(80W)提取的条件下,加入试剂A的提取率比不加试剂A的提取率高出31.2%,提取时间从12min减少到4min。试验表明采用超声波和提取促效剂A不仅可以大大提高提取效率,还能极大地缩短提取时间。