The peculiar impurity concentration ranges in damage-resistant LiNbO3 crystals doped with Mg, Zn, In and Sn

We report on a comparative study of the optical damage-resistant impurities Mg and Zn, as well as In and Sc in LiNbO₃. In LiNbO₃ doped with these ions a certain behavior of physical properties (e.g., the shape of OH stretch mode bands, phase-matching temperatures of optical frequency doubling, etc.) on the impurity concentration is observed. The corresponding ('threshold') concentrations are about 5-7 mol.% for the divalent cations Mg and Zn and only 1 mol.% for the trivalent In and Sc. The results are discussed assuming that these ions incorporate on Li-sites thus removing the intrinsic defect Nb_Li from the lattice.     

Bryostatin 1 activates splenic lymphocytes and induces sustained depletion of splenocyte protein kinase C activity in vivo after a single intravenous administration

The aim of the study was to evaluate a range of W/O semisolid emulsion systems (creams) containing white soft paraffin (petrolatum) and a new type of nonionic lipophilic silicone emulsifier (Abil EM 90) using a novel combination of rheological tests. Emulsifier concentrations from 1.5% to 3.0% w/w were used with two manufacturing procedures, cold (25 degrees C) and warm (70 degrees C) emulsification, to determine whether and to what extent these variables alter the structure and consistency of the creams. The techniques comprised linear (continuous flow) and dynamic (oscillatory) rheometry at 25 degrees C, thermal flow experiments (from 10 degrees to 90 degrees C and back to 10 degrees C), and penetrometry studies. The differences in emulsifier concentration produced effects on the rheological properties of the W/ O creams, although the manufacturing process was much more influential. Cold emulsification led to creams with higher viscosity, lower thixotropy, and better elastic properties. The results of penetration tests on creams correlated with those of the rheological studies. The flow properties of white soft paraffin at 25 degrees C were comparable with the creams obtained by cold emulsification, while the elasticity was considerably lower. Thermorheological studies showed evidence for transitional behavior for white soft paraffin on heating, but not for the creams. White soft paraffin showed a higher viscosity (and resistance to the penetrating force) when melted at 70 degrees C and left to solidify at room temperature, compared to the "unmelted" sample. This was the opposite trend to that found with warm and cold emulsified creams. The input of heat during the emulsification process showed a strong effect on the structure and consistency of the W/O creams containing petrolatum and silicone emulsifier, resulting in a less viscous product. The use of the aforementioned techniques represents a useful and novel approach to the evaluation of cream consistency.     

广电总局连番发文 电视盒子路在何方

正从全面爆发增长到面对存亡危机,电视盒子在2013年至2014年的两年时间里,经历了过山车式的起伏。从2014年6月起,广电总局几乎一月一通告的组合拳成功让电视盒子市场冷静下来,内容端釜底抽薪式的处理,让疯狂的盒子开始恢复理智,面对前所未有的危机,众多盒子厂商将如何面对呢?广电总局为何又会如此看重"盒子"产品呢?     

Morphometric analysis of the rabbit myocardium after chronic ethanol feeding - early capillary changes

Male rabbits were fed with ethanol for 3 weeks. 10 ml of a 20% ethanol solution were applied daily with a stomach tube. The macroscopic, histologic and ultrastructural investigation of the hearts did not reveal and structural alterations. Morphometrically, the endothelial cells of the capillaries were changed, whereas the muscle cells did not show any abnormalities. The quantitative data indicate that the numerical density of endothelial cells is increased, whereas the volume density is not changed. This type of quantitative reaction pattern may be characterized as "proliferation" of endothelial cells. The proliferation is possibly related to ethanol-induced metabolic changes similar to chronic hypoxia. On the other hand, there is some evidence that the alteration is part of a general activation of mesenchymal cells in various organs after ethanol ingestion. The alteration is probably an early stage of the proliferation of capillaries.     

横跨两大操作系统 英特尔凌动Z3000家族崛起

正从399元到3999元,从Android到Windows,无论是从价格还是从操作系统跨界上,均可以看出英特尔凌动Z3000家族的巨大野心。在南下同国产平板电脑厂商合作初显威力的时候,英特尔凌动Z3000家族全面崛起,对64位领域的布局,让我们再次看到了英特尔对移动终端设备领域的期望。     

昂达用户专享 昂达平板助手体验

正"为什么平板电脑没有像智能手机一样的手机助手?"作为一名平板用户,每次将平板同PC连接的时候,总是使用某某手机助手打通平板电脑与PC的链接,心理没有丝毫芥蒂那是不可能的。而昂达前段时间发布的"昂达平板助手"引起了不少平板爱好者的兴趣。下面,就同笔者一同体验这款昂达平板专属的助手吧!