半导体纳米晶体制备及应用进展

综述了量子点的制备及应用进展     

Phase Assemblages of Pr α-sialon Derived from SHS-ed Powders and TEM Study on the Nucleation of Pr α-sialon

The Pr α-sialon powders prepared by self-propagating high-temperature synthesis (SHS), consisting of 55 wt% Pr α-sialon and 45 wt% of β-sialon (abbreviated as α' and β'), were hot-pressed at 1800°C for 1 h. The results showed that Pr α' phase would transfer to β' with the appearance of JEM phase (Pr(Si_{6− z} Al _z )(N_{10− z} O _z )) after sintering, thus resulting in the increase of β' phase to 86 wt%. The addition of Y₂O₃ into SHS-ed Pr α' powders as the starting materials restrains the transformation of α' to β' and prevents the formation of JEM phase as well. The nucleation mechanism of Pr α' grain during hot-pressing was investigated in terms of transmission electron microscope and energy-dispersive spectrometer analysis. Two nucleation modes of Pr α' grains were found, i.e., nucleating on the undissolved Pr α' grains and on the nuclei of (Pr, Y) α' grains precipitated from liquid phase.     

含硫化合物在羰基钴盐合成中的应用

研究了利用低价含硫化合物的强配位能力和还原性及它作为助剂催化引发氯化钴的羰化反应的工艺条件，以便在较低的ＣＯ压力下合成四羰基钴盐。对几种常见含硫化合物的引发反应效果进行了对比。结果表明少量的含硫化合物可以引发钴盐的羰化反应，过多的添加则会阻断氯苄羰化反应的催化作用。     

基体韧性对PS改性PVC体系性能的影响

研究了PS对未增韧PVC体系及用CPE预增韧PVC体系韧性的影响,发现在用CPE预增韧PVC基体后,PS的增韧效果更为显著,但增韧机理井无改变,仍可用"空穴增韧"的机理来解释。     

DQ-Ⅳ催化剂在聚丙烯装置上的试生产

DQ-Ⅳ球形催化剂在扬子石油化工股份有限公司塑料厂聚丙烯装置上首次进行工业化试生产，分别试生产了均聚和嵌段共聚2种聚丙烯产品，并与进口催化剂和原国产催化剂生产作了对比。试生产表明，该催化剂活性较其他催化剂略高，并且活性释放平稳，能满足聚丙烯装置生产的需要，为聚丙烯装置催化剂的全面国产化作好了技术储备。     

SA-3100离心粒度分析条件对粒径真实测定的影响

用SA-3100型离心粒度分析仪测试粉体的粒度时,对同一样品的分析,往往会有不同的结果.通过对沉降介质和分散剂、最大粒径值的设定、以及测量模式的选择等影响因素作比较试验,寻求准确使用该仪器进行粒度分析的方法.     

集成污水水质在线监测装置的研制

介绍基于流动注射分析法的集成污水水质监测仪的研制，该装置可自动检测水中的COD、NH3-N和pH值。     

焦炉炉号识别与定位连锁系统控制

将计算机技术、无线传输技术与光电检测技术相结合，建立自动炉号定位系统，实现了焦炉四大车变压变频(VVVF)控制、精确定位及推焦计划的自动执行。     

利用钾盐混合物提高玻璃制品的强度

本文介绍了一种利用钾盐混合物并通过改变钾盐的比例来提高玻璃制品强度的方法。     

利用膨胀床吸附技术单步纯化分子伴侣—GroEL

Expanded bed adsorption (EBA) is an integrative downstream processing technique for the purification of biological substances directly from unclarified feedstock. In this study, molecular chaperone GroEL, an important protein folding helper both in vivo and in vitro, was purified by the single-step EBA technique from the unclarified homogenate of recombinant E. coli cells. Compared with packed bed adsorption, the EBA technique provided a single-step approach to yield an electrophoretic purity of GroEL. After the homogenate loading and column washing in the expanded bed mode, the GroEL protein was recovered by stepwise salt-gradient elution in packed-bed or expanded-bed modes, respectively. The expanded-bed elution mode was found as efficient as the packed-bed mode in the purification of GroEL from cell disruptate.