RCC超缓凝复合外加剂的试验研究

结合岚河蔺河口水电站碾压混凝土的配合比设计及施工,研究了RCC超缓凝复合外加剂的配方设计及混凝土拌合物性能,并按选定配方以最佳掺量掺入RCC混凝土中进行力学、热学和耐久性试验,测试结果满足设计和施工要求。     

The experimental analysis of a dead-end H2/O2 PEM fuel cell stack with cascade type design

Proton exchange membrane fuel cells (PEMFCs) with a dead-ended anode and cathode can reach high hydrogen and oxygen utilization by a relatively simple system. Nevertheless, the accumulation of the water in the anode and cathode channels can lead to a local fuel starvation deteriorating the performance and the durability of PEMFCs. In this study, a novel design for a polymer electrolyte membrane (PEM) fuel-cell stack was presented which could achieve higher fuel utilization without using hydrogen and oxygen recirculation devices such as hydrogen pumps or ejectors that consume parasitic power and require additional control schemes. The basic concept of the innovatively proposed design was to divide the cells of a stack into several stages by conducting the outlet gas of each stage to a separator and reentering it into the next stage; thereby, a multistage anode and cathode system was prepared. In this relatively ingenious design, a higher gaseous flow rate was maintained at the cell outlet, even under dead-end conditions resulted in a reduced purge-gas emission by avoiding the accumulation of liquid water in the cells. The results revealed that proposed design had the same polarization curve as the open-end mode, leading to an enhanced PEMFC performance.     

哈锅首台自主开发30OMWCFB锅炉设计与运行

本文介绍了哈锅首台自主型300MW循环流化床锅炉的技术特点,并着重介绍了机组在168期间的运行情况,通过运行数据与设计数据的对比可知,锅炉的设计是成功的.     

涡流室式柴油机性能的改进和排放的降低

本文系统全面地分析了国内涡流室式柴油机的性能和排放方面的发展现状,并介绍了进一步的研究成果和提高其性能,减少排放的一系列行之有效的方法和措施。     

不完整滑油数据下发动机磨损的预防性维修决策框架

针对不完整滑油监控数据下发动机磨损的预防性维修决策问题,提出了一个完整的建模和分析框架。该框架包括不完整磨粒数据的建模与辨识、基于磨粒数据模型仿真抽样的发动机磨损寿命分布逼近和发动机磨损预防性维修决策的矩阵解析分析三方面内容。通过集成最大熵概率密度估计和迭代递归预测误差算法、动态聚类和有限位相型分布逼近的期望最大化算法、约束优化和粒子群算法,成功解决了上述三个方面的问题;其分析过程提供了视情维修的典型决策流程,可用于基于状态监控数据的装备维修决策。     

Fully automatic AI-based leak detection system

This paper presents a fully automatic system intended to detect leaks of dielectric fluid in underground high-pressure, fluid-filled (HPFF) cables. The system combines a number of artificial intelligence (AI) and data processing techniques to achieve high detection capabilities for various rates of leaks, including leaks as small as 15 l per hour. The system achieves this level of precision mainly thanks to a novel auto-tuning procedure, enabling learning of the Bayesian network – the decision-making component of the system – using simulated leaks of various rates. Significant new developments extending the capabilities of the original leak detection system described in [1] and [2] form the basis of this paper. Tests conducted on the real-life HPFF cable system in New York City are also discussed.     

丁酸型发酵产氢的运行稳定性

着重对发酵法生物制氢反应系统的丁酸型发酵的运行稳定性进行了研究分析。结果表明,在有机负荷大于21kgCOD/m3·d的条件下,丁酸型发酵具有不稳定性,在负荷冲击下容易转变为丙酸含量较高的发酵类型,从而导致系统产氢能力的下降。分析认为,NADH/NAD+的平衡调节能力是影响系统运行稳定性的一个关键因素。在高负荷条件下,由于丁酸型发酵的产丁酸过程不能氧化过剩的NADH+H+,导致产乙酸过程生成的剩余NADH+H+在系统内大量积累,使反应系统难以达到氧化还原的平衡状态,最终影响了系统的稳定运行。     

Targeting lncRNA H19/miR-29b/COL1A1 Axis Impedes Myofibroblast Activities of Precancerous Oral Submucous Fibrosis

Oral submucous fibrosis (OSF) is known as a potentially malignant disorder, which may result from chemical irritation due to areca nuts (such as arecoline). Emerging evidence suggests that fibrogenesis and carcinogenesis are regulated by the interaction of long noncoding RNAs (lncRNAs) and microRNAs. Among these regulators, profibrotic lncRNA H19 has been found to be overexpressed in several fibrosis diseases. Here, we examined the expression of H19 in OSF specimens and its functional role in fibrotic buccal mucosal fibroblasts (fBMFs). Our results indicate that the aberrantly overexpressed H19 contributed to higher myofibroblast activities, such as collagen gel contractility and migration ability. We also demonstrated that H19 interacted with miR-29b, which suppressed the direct binding of miR-29b to the 3′-untranslated region of type I collagen (COL1A1). We showed that ectopic expression of miR-29b ameliorated various myofibroblast phenotypes and the expression of α-smooth muscle actin (α-SMA), COL1A1, and fibronectin (FN1) in fBMFs. In OSF tissues, we found that the expression of miR-29b was downregulated and there was a negative correlation between miR-29b and these fibrosis markers. Lastly, we demonstrate that arecoline stimulated the upregulation of H19 through the transforming growth factor (TGF)-β pathway. Altogether, this study suggests that increased TGF-β secretion following areca nut chewing may induce the upregulation of H19, which serves as a natural sponge for miR-29b and impedes its antifibrotic effects.     

新型海洋材料在储能领域的应用进展

能源与环境是世界发展的两大议题。海洋资源丰富,蕴含结构多样、性质丰富的生物质材料、矿物材料等,在储能领域展现出良好的应用前景。对新型海洋材料,如海洋生物质材料、衍生碳功能材料和海洋矿物材料等在储能领域的应用做了系统评述。海洋生物质材料自然界储量丰富、环境友好,被广泛应用于储能体系的黏结剂等功能组分;海洋生物质碳化材料富含丰富的孔隙结构,作为先进电极显示出优异的应用潜力;海底矿物材料被作为电极材料和模板材料应用于储能体系中,海底矿物的开采是其未来应用的重要技术保障。对新型海洋材料的类型以及在储能领域中的应用形式做了总结,并对海洋与能源的交叉发展做了展望,以期进一步推动新型海洋材料的可持续利用。     

15000m~3天然气球罐设计

从材料选择及结构型式等方面对15 000m3大型天然气球罐的设计进行了阐述。该球罐的设计压力为1.2MPa,设计温度为50℃,主体材料选用Q370R,球壳厚度取48mm,球壳采用了混合式5带16柱的支柱支撑结构型式,按照有关规范及标准进行设计。