钨铜合金药型罩及其性能

钨铜合金药型罩的应用可以提高射流对均质钢靶的侵彻能力.这一提高得益于射流密度的提高以及断裂时间的延长. 本文对钨铜合金射流及其断裂形态通过X光照像进行了研究.它的旋转效应及其炸高特性也进行了实验研究. 钨铜合金药型罩的威力实验在φ30 mm的破甲弹上进行.在相同装药条件下与紫铜罩相比,威力提高20～30%.     

2,3,4- or 2,3,5-trisubstituted furans: catalyst-controlled highly regioselective ring-opening cycloisomerization reaction of cyclopropenyl ketones

2,3,4- or 2,3,5-trisubstituted furans were highly regioselectively formed from the cycloisomerization reaction of the same starting cyclopropenes 1 via the subtle choice of the transition metal halides. Under the catalysis of 5 mol % PdCl2(CH3CN)2, 2,3,5-trisubstituted furans 2 were given in 50-88% yields with 95-99% regioselectivities, while 2,3,4-trisubstituted furans 3 were formed in 78-96% yields with 99% regioselectivities under the catalysis of 5 mol % CuI.     

自发参量下转换光场的实验研究进展综述

自发参量下转换(spontaneous parametric down-conversion,SPDC)光场是基于单色泵浦光子流和量子真空噪声对非线性晶体的综合作用而产生的,它固有的量子起源决定了在非经典光场研究中的重要地位和作用.对SPDC光场的相干特性和它在绝对测量光电探测器量子效率中的应用进行了深入而细致的研究和探讨.     

HYQ-965-Ⅲ解堵剂的研制及现场应用

针对涠洲11-4油田W11-4D-A1井返吐油基泥浆堵塞油管问题,以渗透剂、乳化剂、分散剂、互溶剂为原料,制备了HYQ-965-Ⅲ解堵剂.考察了不同配方解堵剂中原料间的配伍性和溶垢效果,研究了最佳配方:渗透剂Ⅰ20%、乳化剂Ⅰ10%、分散剂10%、互溶剂10%、海水50%.将该解堵剂在W11-4D-A1井进行应用,从现场使用情况看,HYQ-965-Ⅲ对油基泥浆、原油具有很好的分散能力,成功解除了油管堵塞,达到预期设计要求.     

氮气氛下LTCC基板Cu共烧金属化研究

从PMMA型LTCC素坯膜的制备和PMMA的排胶机理两方面，研究了LTCC基板Cu共烧金属化。结果表明，采用PMMA作为粘结剂的流延浆料具有剪切变稀行为，所得的流延坯膜微观组织均匀，叠压后坯体内部无分层现象。热失重、差热和傅立叶红外光谱联用分析结果表明高纯N2气氛中PMMA以解聚机理热解，热解后释放的主要产物为丙烯酸甲酯。在高纯N2气氛中LTCC与Cu共烧后Cu金属化膜平整、致密，连通良好。经测试，基板表面Cu导体方阻小于5mΩ/□。     

Dynamics of the uptake of free amino acids in the blood serum of the portal vein during the digestion of isolated krill protein

The rate of absorption of amino acids obtained from isolated krill protein administered to rat stomach was studied. Absorption of casein amino acids was determined for reference purposes. Rats subjected to 48-hour fasting were administered krill isolate and casein in the form of homogenates at a rate 540 mg protein per 100 g bw in 6 ml of distilled water. The concentration of free amino acids in the portal vein was measured after 30 minutes, 1, 3 and 6 hours. The content of amino acids was measured by ion-exchange chromatography with the use of an automatic analyzer of amino acids. The digestion of krill protein proceeds at a high rate. This ensures the maximal augmentation of the concentration of most amino acids in the blood of the portal vein 30 min after isolate administration to the stomach.     

攀钢1号和2号方坯连铸工艺及设备

介绍了攀钢提钒炼钢厂1号和2号方坯连铸机的性能参数、工艺布置及流程、设计特点、装备水平,及攀钢通过技术改造新建1号和2号方坯连铸机,彻底淘汰模铸实现全连铸的实践经验.     

Influence of ZnO and P2O5 Content on Modified HZSM-5 on Aromatization of FCC Gasoline

Catalytic properties of different content of ZnO and P₂O₅ supported on HZSM-5 zeolites were studied in the conversion of FCC gasoline (75°C-120°C) into aromatic hydrocarbons with a temperature of 430°C, a liquid hourly space velocity of 1.0 hr^-1, and a pressure of 0.1 MPa. In the reaction, when the contents of ZnO and P₂O₅ are 2% and 4%, respectively, Zn-P/HZSM-5 showed the highest selectivity and activity to aromatic hydrocarbons and conversion of olefins. The content of aromatics in the liquid product and the yield of aromatics reached as high as 94.53%, 68.87%, and 51.74%, respectively.     

Extended analysis of ground impedance measurement using the fall-of-potential method

An extended analysis of ground impedance measurement using the fall-of-potential method will be presented. An interesting curve that represents the exact locations of the potential probe when the potential and current probes are in different directions is obtained for the first time. Curves representing measurement error are also presented for the case when the potential probe is placed in locations where the correct ground impedance cannot be measured. A similar analysis for ground impedance measurements in multilayer soils is also discussed. The study presented in this paper has extended the theory of the conventional fall-of-potential method and the results obtained can serve as a practical guide for ground impedance measurements made using this method.