焙烧预处理过程中硫的转化对浸金的影响

以贵州某卡林型金矿为悁究对象,采用XRD、化恘分析等方法,探索了焙烧预处理过程中焙烧温度、焙烧时间对硫转化率与金浸出率之间相互影响规律。结果表明,在700℃温度下,焙烧1.5~2 h,可以充分打开金的硫化物包裹,浸出率近90%;硫转化率由83.01%升高至91.02%,金浸出率与硫转化率基本呈线性正相关关系,相关系数r=0.93517。     

曲边介质波导的有限元分析

本文应用曲边有限元方法有效地计算了曲边质波导的色散特性，编制了相应的计算程序,应用本文方法计算得到的椭圆旬质波导和组合椭圆介质波导的主模和高次模的色散曲线与文献[2],[3]的结果相当吻合。     

光阑对部分相干光束模式的影响

本文从 Wolf 的相干理论出发,把部分相干光束的交叉谱密度函数展开为空间完全相干模的叠加:进而讨论光阑对部分相干光束模式的影响。     

乙烯与1-癸烯共聚及其共聚物微观结构

采用合成的2种限制几何茂金属催化剂A(2 四甲基环戊二烯基 6 叔丁基苯氧基二氯化钛)、B(2-四甲基环戊二烯基-4,6-二叔丁基苯氧基二氯化钛)分别和助剂Al(iBu)3/［Ph3C］+［B (C6F5)4］-组成体系催化乙烯与1-癸烯共聚反应,并对共聚物微观结构的序列分布和链增长基元反应概率统计进行分析,探讨了该体系下的共聚机理和共聚物结构。结果表明：(1)共聚物主链上共聚单体1-癸烯质量分数在14.3%~67.2%之间;(2)共聚物链增长机理符合一级Markovian模型链增长机理;(3)所得共聚物结构更趋向于聚乙烯共聚物,1-癸烯更容易配位或插入到{共聚物主链-1-癸烯-1癸烯-催化剂}序列,乙烯更容易配位或插入到{共聚物主链-乙烯-乙烯-催化剂}序列;(4)随着1-癸-烯浓度的增加,乙烯与1-癸烯共聚物更趋向嵌段结构;(5)1-癸烯更容易插入到催化剂B上。     

Viscosity reduction of acidic heavy oil through emulsification: effects of salinity and pH

In this research, sodium dodecyl sulfonate (SDS) was selected as emulsifying viscosity reducer through a great number of laboratory experiments and then the effects of salinity and pH on viscosity reduction effects were evaluated. The result showed that higher salinity would result in emulsion viscosity enhancement. Compared with neutral pH conditions (pH =7), both acidic and basic conditions would promote emulsion viscosity reduction. When pH >7, generated O/W emulsions were much more stable than all other emulsions. Detailed compositional characterization of petroleum acid through a high resolution mass spectrometer (FT-ICR MS) proved that carboxylic acid and phenols inside petroleum acid would react with OH^- at basic conditions and produce some natural surfactants. Theses natural surfactants could work synergistically with SDS and further improve emulsion stability.     

Effect of oil-solubility catalysts on the low-temperature oxidation of heavy crude oil

Due to low oil recovery factor in heavy oil reservoir, air injection with catalyst becomes a competitive technology to effectively reduce viscosity of crude oil as a result of the low cost and small environment pollution. This paper determined the feasibility of air injection with catalyst in a heavy oil reservoir through static and dynamic experiments. The results indicated that under the effect of catalyst, oxidation between heavy oil and air could significantly reduce the viscosity of crude oil. The optimal catalyst contained 0.7?wt. % oil-solubility organic acid copper and 0.5?wt. % sodium hydroxide. With the oxidation time increasing, viscosity of crude oil decreased and oil recovery factor increased. With temperature increasing, viscosity of crude oil decreased sharply and oil recovery factor increased. The oil recovery factor of air huff-n-puff process was 30.2%. Air injection with catalyst in the reservoir is a promising technology.     

导弹姿态控制系统中校正网络的改进

校正网络是导弹姿态控制系统中变换放大器的重要组成部分.根据某导弹改型前后校正网络传递函数的变化,分析了网络变化的原因,介绍了陷波器消除结构谐振的补偿原理,并给出了此类有源陷波器的设计方法.     

固定化酵母薯干原料酒精发酵中试研究

本文论述了固定化酵母薯干原料带渣酒精发酵的中试结果。中试生物反应器容积为１０００Ｌ，采用改性海藻酸钙凝胶为固定化酵母细胞的载体。中试研究中设计了较合理的中试工艺流程，优选出较佳的发酵条件，并考察了生物反应器的性能。试验获得了如下结果：中试装置已运转１９２天，固定化酵母仍保持高活力，并可继续运转；发酵成熟醪酒精含量达６．５～８．０％（ｖ），它比同期传统式酒精发酵高出０．３～０．４％；淀粉利用率达９１～９２％；固定化酵母生物反应器的乙醇生产能力为９．５ＫｇＥｔＯＨ／Ｍ￣３·ｈ，它可比传统式发酵罐的生产能力提高１０～１２倍。     

沼气发酵综合利用的现状与发展趋势

论述了我国沼气发酵综合利用技术的现状－沼气和沼气发酵残留物的各种利用途径及所取得的经济效益,分析讨论了沼气技术与农村可持续发展的关系,提出了“绿色－立体经济”模式。     

半导体热电堆串、并联发电性能及热电堆复现性研究

对半导体热电堆的复现性进行了实验研究。以此为基础进行了热电堆的串联,并联实验,得到了半导体热电堆串联并联的规律,并用有限差分法对热电堆的各项发电性能指标进行了数值计算,为热电发电技术做了有益的探索。