密胺树脂强化“脱硫石膏-玻纤”的成型过程与机制

为了资源化利用烟气脱硫产生的工业废弃物脱硫石膏,以密胺树脂强化的脱硫石膏-纤维复合体系为研究对象,将密胺树脂固化成型条件与石膏的水化成型过程进行匹配与优化,发展出具有优异综合性能的石膏复合板材.结果表明:密胺树脂的固化交联与石膏晶须生长过程的合理匹配与协同,既有助于形成有机-无机紧密结合,同时也有助于加强脱硫石膏晶须与玻璃纤维之间的附着,促进实现密胺树脂对材料性能的强化;石膏复合板的抗折强度不低于18 MPa,抗压强度大于25 MPa,弹性模量大于6500 MPa,24 h吸水率低于3.0%,主要性能超过传统的水泥或硅酸钙类型的基础板材,具有明显的技术及市场开发前景.     

两个大型住宅项目设计配套消防备供电源供电方案分析及优劣对比

通过对两个大型住宅项目配置消防备供电源供电方案进行对比,分析由此产生的建设安装造价成本高低,以及后期物业管理程序的难易程度,总结出适宜于大型住宅项目的消防备供电源供电方案,既能降低建设投资成本,又可以简化后期物业管理程序,更好地保障消防系统供电安全,值得推广。     

某型发动机自反馈调节阀动态仿真分析

基于FLUENT软件提供的计算方法和物理模型，利用动网格技术及用户自定义函数（User-define Function，UDF），对发动机预燃室调节阀的自反馈调节过程进行动态数值模拟，并分析阻尼参数对调节效果的影响。结果表明：自反馈机构可实现对不同压力扰动的及时响应，具有稳定流量的效果，改变阻尼参数可对调节响应速度和流量稳定性进行优化，其中摩擦力对调节影响最显著。     

Generally weighted moving average monitoring schemes: Overview and perspectives

An overview of monitoring schemes from a class called generally weighted moving average (GWMA) is provided. A GWMA scheme is an extended version of the exponentially weighted moving average (EWMA) scheme with an additional adjustment parameter that introduces more flexibility in the GWMA model as it adjusts the kurtosis of the weighting function so that the GWMA scheme can be designed such that it has an advantage over the corresponding EWMA scheme in the detection of certain shift values efficiently. The parametric and distribution-free GWMA schemes to monitor various quality characteristics and its existing enhanced versions (ie, double GWMA, composite Shewhart-GWMA, mixed GWMA-CUSUM, and mixed CUSUM-GWMA) have better performance than their corresponding EWMA counterparts in many situations; hence, all such existing research works discussing GWMA-related schemes (ie, 66 publications in total) are documented and categorized in such a manner that it is easy to identify research gaps. Finally, a number of possible future research ideas are provided.     

Locally one-dimensional-alternating segment explicit–implicit and locally one-dimensional-alternating segment Crank–Nicolson methods for two-dimension parabolic equations

In the paper two new locally one-dimensional alternating segment schemes for solving the 2-D parabolic problems are developed. The parabolic problems can be solved efficiently over decomposed sub-domains. Two schemes are proved to be unconditionally stable and numerical experiments show the validity of the schemes.     

The Protective Effects of the Autophagic and Lysosomal Machinery in Vascular and Valvular Calcification: A Systematic Review

Background: Autophagy is a highly conserved catabolic homeostatic process, crucial for cell survival. It has been shown that autophagy can modulate different cardiovascular pathologies, including vascular calcification (VCN). Objective: To assess how modulation of autophagy, either through induction or inhibition, affects vascular and valvular calcification and to determine the therapeutic applicability of inducing autophagy. Data sources: A systematic review of English language articles using MEDLINE/PubMed, Web of Science (WoS) and the Cochrane library. The search terms included autophagy, autolysosome, mitophagy, endoplasmic reticulum (ER)-phagy, lysosomal, calcification and calcinosis. Study characteristics: Thirty-seven articles were selected based on pre-defined eligibility criteria. Thirty-three studies (89%) studied vascular smooth muscle cell (VSMC) calcification of which 27 (82%) studies investigated autophagy and six (18%) studies lysosomal function in VCN. Four studies (11%) studied aortic valve calcification (AVCN). Thirty-four studies were published in the time period 2015–2020 (92%). Conclusion: There is compelling evidence that both autophagy and lysosomal function are critical regulators of VCN, which opens new perspectives for treatment strategies. However, there are still challenges to overcome, such as the development of more selective pharmacological agents and standardization of methods to measure autophagic flux.     

脱硝还原剂尿素法改造常见问题及优化探讨

近几年,脱硝还原剂尿素法改造常见于火电厂,这是为了消除液氨这一危险源。但在改造设计中,有些具体问题容易被设计人员忽视。以L公司为例,尿素制氨系统运行2 a多来,暴露出了卸料管振动大、溶解罐溢流管出气泡、疏水箱振动大、疏水母管无法隔离、气相阀门腐蚀内漏、水解器排污时间定值不合理等一系列问题。经过L公司技术人员的努力,现已对部分问题进行了优化,经过运行,检验效果良好。     

基于Workbench的组合式锚钻机关键零部件仿真研究

利用Workbench对液压夹持器进行分析,得到在不同工况下的工作振动频率与其固有频率之间的关系;对顶锚排钻框架进行静力学分析,可知顶锚排钻框架设计满足强度要求且变形较小。研究结果表明,液压夹持器与顶锚排钻框架具有强度高、运行稳定性好等特点,为锚杆支护工程施工装备的研究提供了理论参考。