硬盘铝基片擦洗机的PLC控制

文章介绍了为１３片硬盘铝基片擦洗机设计的气动系统和电气控制系统,硬盘铝基片擦洗机的自动循环用ＯＭＲＯＮ２００Ｈ型ＰＬＣ控制。整机调试表明气、电一体化控制非常成功     

全球钛业回顾和展望

概述了磁光记录原理,介绍了磁光盘的基板材料,并重点阐述了稀土－过渡（ＲＥ－ＴＭ）合金非晶膜的制造方法,性能及其保护膜。另外还扼要介绍了氧化物单晶膜,多晶膜和多层超薄磁光记录膜的优缺点,并指出多层膜磁光记录材料是今后的发展方向。     

NMOS低温热载流子晶体管的解析研究

利用低温(77-295K)短沟NMOSFET准二维解析模型,研究了77-295K温区NMOSFET衬底电流相关的物理机制。发现沟道电子平均自由程不随温度而改变,其值约为7.6nm;低温下虽然沟道电子在漏端获得较高的能量,但由于碰撞电离减弱,使NMOSFET的衬底电流不随温度降低而显著增长。实验结果证明,提出的衬底电流机制和模型适用于77-295K宽温区范围。     

Effect of Substrate Temperature on Electroluminescence of SrS:HoF3 Thin Film

The SrS:HoF3 Electroluminescent (EL) thin films are prepared at the different substrate temperature by electron beam evaporation. The crystallinity and EL characteristics of the samples are analyzed. It is found that the main diffraction peak is (200) at the higher substrate temperature and the main diffraction peak is (111) at the lower substrate temperature. The blue emission intensity and EL brightness of the SrS∶HoF3 thin films increase with the increase of the substrate temperature. Annealing the samples can change the cyrstal phase and strengthen the blue emission of EL thin film.     

Substrate characterisation for a subsurface reactive barrier to treat colliery spoil leachate

Subsurface permeable reactive barriers (PRB) have been used to successfully treat acidic mine drainage in Canada and offer great potential for doing the same in the United Kingdom. A PRB for the treatment of colliery spoil leachate from a site near Newcastle upon Tyne, UK, has been designed. The selection of the reactive media to be used is of paramount importance, with particular reference to permeability and reactivity. A number of reactive media mixtures containing varying proportions of cattle slurry screenings, green waste compost, calcite limestone chips and pea gravel were prepared and their respective permeabilities and reactivities were investigated. Media mixtures containing 50% 10 mm grade calcite limestone chips showed better alkalinity addition and metals removal than a blank containing 50% pea gravel. A media mixture containing 50% limestone chips and 50% green waste compost showed a 24 h period to achieve maximum addition of alkalinity and maximum removal of acidity and metals. Mixtures containing 25% green waste compost and 25% slurry screenings achieved maximum addition/removal in 4 h. The likely presence of iron sulphide in samples drawn from test vessels during both test runs indicates that bacterial sulphate reduction is occurring in this composite.     

硬盘用基板微晶玻璃的研究与应用

介绍了适用于高容量、小型化硬盘用基板的各种微晶玻璃材料，简要讨论了各种微晶玻璃的化学组成、显微结构、主晶相种类以及各种微晶玻璃的特性，并对今后的发展趋势进行了展望。     

Numerical simulation of substrate effects on spinodal decomposition in polymer binary mixture: Effects of the surface potential

The surface-directed spinodal decomposition (SDSD) of polymer binary mixture with different values of surface potential is numerically simulated in three-dimension (3D) by cell dynamic systems (CDS). Furthermore, the growth laws of the wetting layer are theoretically analyzed by the current equation and the dynamical scaling. The results show that the thickness of the wetting layer increases with the increasing surface potential. The crossover, which is later for larger values of surface potential, appears in the evolution curve of the wetting layer. Before the crossover, the growth law is the surface potential dependant growth law. Subsequently, the growth law is the typical Lifshitz-Slyozov (LS) growth law. The results indicate that the surface potential can result in the mutual transformation between completely wetting and partially wetting for the substrate interface. It can be found that the higher surface potential leads to the faster and stronger transmission of the effect of the substrate on the spinodal decomposition in the bulk.