Influence of the chloride ion concentration on the corrosion of high-purity Mg,ZE41 and AZ91 in buffered Hank’s solution

This research studied the influence of the chloride ion concentration on the corrosion behaviour of high-purity magnesium (Mg) and two Mg alloys in Hank’s solution, using hydrogen evolution and weight loss. A buffer based on CO₂ and NaHCO₃ was used to maintain the pH constant. The corrosion behaviour was governed by a partially protective surface film, and film breakdown by the chloride ions. The carbonated calcium phosphate layer that formed in Hank’s solution was important in determining the protective properties of the surface film.     

Effect of polymers and media type on extending the dissolution of amorphous pioglitazone and inhibiting the recrystallization from a supersaturated state

Amorphous forms of crystalline drug are widely utilized for bioavailability enhancement of low solubility drugs in the pharmaceutical industry. Polymers have been found to be effective crystallization inhibitors for amorphous forms in solid states during storage or in liquid states during dissolution process. The dissolution and crystallization behaviors of these amorphous forms in the presence or absence of polymers are still far from adequately understood especially in different dissolution environments. The objective of this study was to investigate the effects of polymers and media type on extending the dissolution of amorphous pioglitazone and inhibiting the recrystallization from a supersaturated state. Polyvinylpyrrolidone K30 (PVPK30), polyvinylpyrrolidone K90 (PVPK90), polyethylene glycol 6000 (PEG6000), polyethylene-polypropylene glycol 188 (F-68), hydroxypropylmethylcellulose (HPMC) and beta-cyclodextrin (β-CD) were employed to understand these behaviors changes because these polymers were used widely. Three solutions including neutral water and phosphate buffer solutions (PBS, pH6.8 and pH7.4) were adopted as dissolution media to determine the behaviors changes comprehensively. In the presence of polymers, dissolution and solubility were extended to different degrees in three media. Polymers can delay the crystallization routes dependently of the medium type. Buffer salts in media reduced the dissolution and accelerated the crystallization process. Crystallization inhibition of these polymers was strongly dependent on the type and pH of media. HPMC displayed the strongest crystallization inhibition effects, resulting in the greatest degree of maintaining a supersaturated state that can sustain most effectively for biologically relevant timeframes.     

典型楼控系统的比较及选型研究

本文针对主流楼控技术的网络架构、协议及某网站实验室的国内外楼控系统的排名进行了相应的分析研究，并重点比较了国内外典型楼控系统的各项数据，为楼控的产品选型提供了有力依据。     

基于罗克韦尔变频器的高性能纤维生产线自动控制系统

本文研究使用罗克韦尔自动化控制系统,结合高性能纤维生产工艺要求,对纺丝项目卷绕流程的电气控制系统进行设计,使螺杆控制、卷绕控制和公共控制部分实现了全自动化,减少了人力成本。     

Integrated Computational Materials Engineering (ICME) Approach to Design of Novel Microstructures for Ti-Alloys

In this overview, we present integrated CAPHAD and phase-field modeling with critical experiments to explore a newly discovered, nonconventional, solid–solid phase transformation pathway based on the so-called pseudo-spinodal mechanism. We show that this new transformation pathway offers a new design strategy for Ti alloys with extremely fine and uniform α + β microstructures that could potentially have highly attractive balances of mechanical properties. To broaden the processing window for such a mechanism to operate, we also explore a different nonconventional transformation pathway that involves precursory phase separation. In addition, the variant selection process during the β → α transformation leading to macrozones is investigated and the results could shed light on how to control processing conditions to avoid or reduce microtexture at both the individual β grain level and the overall polycrystalline sample level.     

船舶用氯化橡胶防腐蚀涂料的研制

利用中、长油度醇酸树脂、环氧树脂、钛白粉、附着力促进剂及耐紫外光助剂对氯化橡胶涂料进行改性研究,开发出一种适用于海洋环境的船舶、海上采油平台及钢构件用的高光氯化橡胶防腐蚀涂料,其涂层具有优异的装饰性、耐光老化性、耐盐雾性及附着力。     

还原炉进料夹液对生产的影响及控制措施

分析了多晶硅还原炉进料夹液产生的原因及其对生产的影响。主输送管位置高于各还原炉进料管是产生进料夹液的主因,进料夹液易造成还原炉跳停、控制不稳定等故障,可通过降低主输送管的位置、输送管设置电伴热、还原炉进料管配置排液管等措施解决还原炉进料夹液的问题。