复合捕收剂在铁矿石反浮选中的协同作用

为提升齐大山铁矿浮选指标,研制出一种高效既含N-H又含O-H基团的新型捕收剂DJW-II,用于齐大山铁矿磁选混合精矿反浮选脱硅研究,并考察了JW系列辅助捕收剂对浮选效果的影响。结果显示：在浮选温度21 ℃,pH值为9.0,捕收剂DJW-II粗选用量125 g/t、精选用量50 g/t,辅助捕收剂 JW-4用量0.6 g/t,抑制剂羧甲基淀粉钠用量250 g/t的条件下,采用1粗1精的浮选流程得到产率50.98%、精矿铁品位68.08%、铁回收率69.85%的精矿。添加辅助捕收剂可以改善浮选过程所产生泡沫的体积、半衰期及泡沫黏度,进而提高浮选指标。构建了所采用辅助捕收剂JW-4的主要成分、水分子及Ca2+离子、Cl-离子的结构,通过Materials Studio软件构建泡沫膜结构的分子模型,并采用Forcite模块,对构建的分子模型进行结构优化及动力学计算。结果表明,加入辅助捕收剂后,捕收剂分子的活性基团与中间的水分子的吸附更为紧密,与气泡性能测试中加入辅助捕收剂后泡沫黏度变大的结果相吻合。     

Application and Kinetics of Ozone in Food Preservation

Ozone is activated oxygen and it is referred to as a triatomic form of oxygen. It is a natural agent and has a broad antimicrobial property, which together with an oxidation potential, make it an attractive option for the food industry. This article focuses on the use of ozone for preservation of vegetables, fruits and fruit juices, and highlights the inactivation mechanism of microorganisms. The application of ozone in grain storage and the quality of ozone treated grains is discussed, along with the reaction kinetics of ozone in grains.     

Study on factors enhancing photobleaching effect of fluorescent dye

With unique capability of biomedical diagnosis and chemical analysis, microfluidics has received worldwide applications in various fields. Multiple methods have been proposed to measure velocity profile of flow in microchannels, among which the laser induced fluorescence photobleaching anemometer (LIFPA) provides great performance with not only high spatial resolution but also superior temporal resolution compared with former systems. The measurement sensitivity and temporal resolution of LIFPA system is largely determined by the speed of fluorescence photobleaching effect, meaning that a half-life decay time as short as possible is required to achieve superior temporal resolution. In this paper, several experiments are done to investigate the influence over the half-life decay time by several factors, including incident laser power, dye concentration, buffer concentration and fluidic pH value. Based on the experimental results, a certain dye solution is specially designed, which demonstrates an extremely fast photobleaching effect with a half-life decay time of about 55 μs. Fluorescent dye solution with such a fast photobleaching effect is potentially applicable in the analysis of transient flows, such as the rise time of electroosmotic flow, where high temporal resolution is required.     

放化法测定^126Sn的半衰期

＾１２６Ｓｎ的半衰期值迄今有准确测量过，文献值 约１０＾５ａ。用放化法从反应堆辐照过的＾２３５Ｕ靶中分离出＾１２６Ｓｎ，用ＨＰＧｅ－Ｓ９０多道分析器测量它的活度；以裂变监测核＾９０Ｓｒ、＾１３７Ｃｓ计算Ｕ靶中发生的裂变数。     

生物可溶性耐火纤维的研究进展

综述了生物可溶性耐火纤维的研究进展,介绍了可溶性耐火纤维的组成和性能,总结了可溶性耐火纤维生物性能的测试方法。具体介绍了可溶性耐火纤维的化学组成对生物持久性的影响,纤维的溶解常数、欧盟指数和半消失期之间的关系,以及这类纤维的应用。     

利用加速器质谱学中的入射离子X射线方法测定79Se的半衰期

利用加速器质谱学中的入射离子X射线方法(PX-AMS)对79Se的半衰期进行了测定.用这一直接测量79Se原子数的方法得到新的79Se半衰期为(2.80±0.36)×105a.利用同样的方法也测定了75Se的半衰期,75Se半衰期的测定结果显示利用PX-AMS方法对79Se半衰期的测定结果是可靠的.     

k0-NAA相关核参数(97Zr半衰期)的精确测定

以三种不同脉冲处理原理的测量系统测定了用于k0-NAA中热/超热中子注量率比计算的97Zr半衰期.结果为(16.755±0.013)h.澄清了目前国际上常用的两个值16.744 h和16.90 h之间的分歧.对使用不同测量系统时各种死时间校正方法的有效性进行了评价.对放射性强度跨越1000倍动态范围(10个半衰期)的跟踪测量中影响相对峰计数率精确测定的因素进行了讨论.     

濮城油田泡沫优化的研究

本文探讨利用泡沫分散稳定剂改善泡沫体系,解决用联合站污水配制泡沫时产生沉淀以及单剂溶解较慢的问题,并优化选取一种起泡性能好,半衰期长的抗高温、高矿化度的泡沫体系。     

镀银纤维功能性织物的性能分析与优化设计

探究镀银纤维试制功能性纺织品的设计要点.选择锦纶基镀银纤维、棉纤维、涤纶纤维、锦纶纤维等多种材料,通过对经纬纱线的线密度、捻度、捻向、纤维成分、颜色及织物经纬密度、组织等进行系统设计,试制出了10种织物,并测试了这10种织物的防静电、导电、电磁屏蔽和防紫外线性能.测试结果表明,所试制的织物均具有良好的防静电性、导电性和电磁屏蔽性.指出,锦纶基镀银纤维织物的防静电、防紫外线、电磁屏蔽性能优良;对于防紫外线、电磁屏蔽性能而言,股线织物优于单纱织物,轻薄型织物优于中厚型织物,深色织物优于浅色织物.     

静电衰减时间常数测试仪的原理与设计

比较了国内外常用的静电衰减时间测试仪器的优缺点，在此基础上提出新的测试方法，介绍了一种基于单片机的静电衰减时间测试仪器的研制过程。并对其测试结果作了分析讨论。