Behind the development of integrated circuits to the current brilliant era is the contribution of Moore's Law, which has guided the development prospects of the industry for a long time. But as transistors continue to shrink in size and thickness, silicon itself approaches its own physical limits and Moore's Law no longer applies. Therefore, scientists are eager to solve this puzzle by introducing new materials, including two-dimensional materials. Molybdenum disulfide has attracted much attention because of its special properties, and the preparation method needs to be studied deeply for large-scale use of molybdenum disulfide. There are many factors that affect the synthesis of single layer molybdenum disulfide, such as the amount of reaction source, air pressure, substrate, reaction temperature of two sources, source heating rate, holding time, relative position between molybdenum source and sulfur source substrate, gas flow, etc. In short, these reaction conditions are summarized, which mainly affect the concentration and reaction speed of sulfur source and molybdenum source in the reaction substrate position. In this paper, the effects of CVD on the quality of single layer disulfide were summarized and its development trend was prospected.
It is the first time for Hebi No.9 mine to use the whole coal anchor cable support in 3204 upper coal roadway. However, the original support condition has large deformation, insufficient support strength and poor effect. Therefore, the roof support mode of 3204 lower coal roadway is studied and optimized. The plastic zone development, surrounding rock stress distribution and roof subsidence law of 3204 coal roadway under different roof anchor cable support are analyzed. After comprehensive on-site construction and support cost, it is determined that the anchor cable support is changed from “3-0-3” to “4-3-4”. After optimization, the deformation of 3204 lower coal roadway is significantly reduced. The optimization scheme is applied to the 4101 coal roadway on the working face of Hebi No. 3 mine. The field monitoring data shows that the maximum displacement of roof and floor is 129 mm, the maximum displacement of two sides is 140 mm, and the maximum displacement of roof separation is 20 mm.
通过实验研究,将氧气浓度/甲烷浓度(Rmix)作为变量,对不同Rmix下固体氧化物燃料电池(SOFC)的放电极化曲线进行研究,分析Rmix对电池性能的影响,同时对瓦斯当中硫化氢(H2S)和高级烷烃杂质含量对电池性能的影响进行剖析,进而为低浓度瓦斯燃料电池的研究和发展提供理论基础.
低浓度含苯有机物污染的传统处理一直是一个难解决问题,光催化降解有望成为一种高效、低成本、环保处理的模式.本文以典型的水杨酸(含苯有机物)为研究对象,以BiOBr为光降解催化剂,探索BiOBr的合成条件对水杨酸光降解性能的调控.研究发现,160℃合成的催化剂催化效率最佳;20 mg/L的水杨酸质量浓度为最佳降解浓度;最优催化剂投放量为 0.1 g(20 mg/L的特征污染物 200 mL),此时水杨酸的降解效率高达 97.53％.本文研究BiOBr催化剂对水杨酸(含苯特征污染物)的光降解性能调控,该研究数据以期为含苯有机物光降解的工业工艺设计提供思路和优化方案.
Wound infection is a common problem in the medical field. Traditional wound dressings are easy to lead to exogenous infection,while hydrogel wound dressings show excellent antibacterial activity, biocompatibility and other advantages, so they have attracted much attention. In this paper, the antibacterial mechanism and research progress of different types of antibacterial hydrogels were reviewed, and their application prospects were prospected.
