夹层式结构在金刚石钻头上的应用

采用冷压成型夹层和加灰(过渡层)热压烧结法制备了一种夹层结构金刚石钻头.经与普通金刚石钻头进行对比试验发现,夹层结构钻头速度和使用寿命比普通钻头有了明显的提高,其原因是由于钻头工作时岩脊的体积破碎作用.这样初步找到了一种既能提高金刚石钻头钻进速度,又能增加金刚石钻头寿命的制造方法.     

利用ADCP回波强度估算河流悬移质含沙量的应用研究

通过简要介绍利用声学多普勒水流剖面仪(ADCP)回波强度估算悬移质含沙量的基本原理,结合梧州水文站的应用实例,利用ADCP的回波强度数据和现场采集的水样含沙量建立相关关系,根据相关关系由回波强度反演估算的水体悬移质含沙量验证了利用ADCP的回波强度估算悬移质含沙量的可行性。应用于梧州水文站的实践表明,左河道推算的系统误差为-0.1%,右河道推算的系统误差为1.5%。这种方法具有不扰动流场、测量剖面同步性较好、数据空间分辨率较高的优点,与传统的取样过滤称量法相比,计算效率显著提高。     

Pt/C活性催化剂催化氢化合成6-氯-2-羟基喹喔啉

以对氯邻硝基乙酰乙酰苯胺为原料，在碱性条件下经环合及催化氢化合成6-氯-2-羟基喹喔啉。采用自制的Pt／C催化剂，考察了反应条件对产品收率的影响，在85℃，1．0～1．3MPa氢气压力下进行加氢还原反应，总收率89．6％(以对氯邻硝基乙酰乙酰苯胺转化为6-氯-2-羟基喹喔啉)。     

Kinetics of the methanation of carbon dioxide over a supported Ni-La2O3 catalyst

The kinetics of the methanation of carbon dioxide was investigated using an alumina supported Ni-La₂O₂ catalyst in a differential and integral reactor. In the differential reactor the molar ratio of H₂ to CO₂ was varied from 0.6 to 30. In the integral reactor the rates were measured with up to 90% conversion. Both reactor tests were carried out at temperatures between 513 and 593 K. The experimental results were described by a Langmuir-Hinshelwood type equation. The kinetics can be explained by assuming equilibrium of dissociative carbon dioxide and hydrogen adsorption, and assuming hydrogenation of surface carbon as the rate determining step.     

VOID FRACTION PROFILES IN PLANE-POISEUILLE FLOW OF VISCOELASTIC FOAMS

This investigation focuses on slow, isothermal, two-phase flow of gas bubble suspensions in Separan solutions, prepared with the help of a sodium borohydride blowing agent at room temperature. The total residence time in these experiments is much smaller than characteristic times for growth or rise of bubbles. The variation of bubble volume fraction across a narrow gap between two planes, is recorded at two locations along the flow direction. This is done with a Cesium gamma-radiation source focused on a region of area.012 cm² in the flow plane, and a Sodium iodide detector across the channel yielding a resolution of.01 over the range of void fractions investigated from.02 to.08. This measurement allows us to identify conditions under which the two-phase flow may be described by a two fluid model with a uniform bubbly core and a bubble free wall layer. With this two phase flow structure, a relative viscosity equation for the suspension is used to compute an apparent viscosity. Such calculations indicate that the observed reduction in apparent viscosity for the two phase flow may be attributed to a bubbly core which is more shear thinning than the medium. The additional shear thinning factor for the suspension is related to the elasticity of the medium.     

聚氨酯丙烯酸酯紫外光固化PVC涂料的研制

通过对涂料不同组分的种类及配比进行调节,制备不同配方的PVC清漆。在测试附着力、硬度、耐温、耐水性能的基础上,优化涂料配方,并配制出性能优异的PVC清漆涂料。     

聚乙烯/石墨阻燃复合材料的研究

研究了石墨、可膨胀石墨、膨胀石墨 /聚乙烯复合材料的阻燃性能。结果表明 ,石墨具有一定的阻燃作用 ,可膨胀石墨具有良好的阻燃效果。但可膨胀石墨填充的复合材料力学性能较差     

荧光染料用于涤纶织物染色的荧光性能研究

在实验条件下，染色织物的荧光反射率随荧光染料的浓度增加而增加，超过一定浓度后，有下降趋势；在pH=5左右，荧光反射率最高；荧光增白剂会提高染色织物的荧光反射率，在荧光黄2GFL中，当荧光增白剂的浓度由0.1％增加到5％时，荧光反射率由8．43增加至18．59，而对非荧光染料只有增艳的作用，不产生荧光。荧光染料染色织物的荧光反射率随着加入非荧光染料量的增加而减弱。