Deterioration Mode of Barium-Containing NOx Storage Catalyst

Barium-containing NO _x storage catalyst showed serious deactivation under thermal exposure at high temperatures. To elucidate the thermal deterioration of the NO _x storage catalyst, four types of model catalyst, Pt/Al₂O₃, Ba/Al₂O₃, Pt–Ba/Al₂O₃, and a physical mixture of Pt/Al₂O₃ + Ba/Al₂O₃ were prepared and their physicochemical properties such as BET, NO TPD, TGA/DSC, XRD, and XPS were evaluated while the thermal aging temperature was increased from 550 to 1050°C. The fresh Pt–Ba/Al₂O₃ showed a sorption capacity of 3.35 wt%/g-cat. but the aged one revealed a reduced capacity of 2.28 wt%/g-cat. corresponding to 68% of the fresh one. It was found that this reduced sorption capacity was directly related to the deterioration of the NO _x storage catalyst by thermal aging. The Ba on Ba/Al₂O₃ and Pt–Ba/Al₂O₃ catalysts began to interact with alumina to form Ba–Al solid alloy above 600°C and then transformed into stable BaAl₂O₄ having a spinel structure. However, no phase transition was observed in the Pt/Al₂O₃ catalyst having no barium component, even after aging at 1050°C.     

The triterpenoids of Ganoderma tsugae prevent stress‐induced myocardial injury in mice

Ganoderma mushrooms (Lingzhi in Chinese) have well‐documented health benefits. Ganoderma tsugae (G. tsugae), one of the ganoderma species, has been commercially cultivated as a dietary supplement. Because G. tsugae has high antioxidant activity and because oxidative stress is often associated with cardiac injury, we hypothesized that G. tsugae protects against cardiac injury by alleviating oxidative stress. We tested the hypothesis using a work‐overload‐induced myocardial injury model created by challenging mice with isoproterenol (ISO). Remarkably, oral G. tsugae protected the mice from ISO‐induced myocardial injury. Moreover, the triterpenoid fraction of G. tsugae, composed of a mixture of nine structurally related ganoderic acids (GAs), provided cardioprotection by inhibiting the ISO‐induced expression of Fas/Fas ligand, oxidative stress, and apoptosis. The antioxidant activity of GAs was tested in cultured cardio‐myoblast H9c2 cells against the insult of H₂O₂. GAs dissipated the cellular reactive oxygen species imposed by H₂O₂ and prevented cell death. Our findings uncovered the cardioprotective activity of G. tsugae and identified GAs as the bioactive components against cardiac insults.     

硅钢片绝缘涂层的边缘增厚与辊涂机的改进

本文在叙述辊筒涂层分析法的基础上分析了影响大型汽轮发电机用铁芯硅钢片绝缘涂层边缘增厚的因素,得出了"混入无机填料降低漆液的粘性,降低涂漆辊的表面硬度以及采用四辊机辊涂硅钢片漆的措施可减小边缘增厚效应"的结论,为我国电机行业用铁芯硅钢片涂漆工艺和设备的改进提供了理论基础.     

羊毛衫CAD中尺寸缩放的研究与实现

选择前后中直线、衣长线(肩点)、袖肥中线、袖山深线、领中线作为缩放码的基准线，以M型号上衣尺寸为基本尺寸，采用国际惯例提供的十分法比例计算档差，通过缩放数据库和缩放算法对各种型号的羊毛衫上衣自动进行尺寸缩放，计算机根据缩放后的尺寸进行工艺计算。     

圆锯安全自控装置制动性能的微机测试系统

本文针对圆锯安全自控装置的制动性能，设计了一种实用的微机测试系统，同时介绍了该系统的关键技术，并对实测结果进行了综合分析。     

三种堆型核燃料循环经济性比较

本文详细地分析了压水堆、高温气冷堆、快堆三种堆型核电厂的燃料循环过程,建立了燃料循环费用的计算模型和灵敏度分析模型。对三种堆型的核燃料费用进行了分析比较,指出快堆是燃料费用最经济的堆型。     

亚麻织物前处理的研究

本文为提高亚麻织物档次,使半成品质量符合染整深加工的要求,对煮练前处理工艺的温度,助练剂及增效剂等方面作了大量试验工作,并进行了研究分析。提出了提高亚麻织物前处理质量的工艺技术,以及对助练剂及增效剂进行了探索。     

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