Small Fatigue Crack Growth Behavior and Fatigue Strength of Squeeze-Cast Aluminum Alloys, AC8A-T6 and AC4C-T6

Fatigue strength, crack initiation and small crack growth behavior in two kinds of squeeze-cast aluminum alloys such as AC8A-T6 and AC4C-T6 were investigated using plain specimens subjected to rotating bending fatigue at room temperature. Fatigue resistance of these alloys was almost same as that of the wrought aluminum alloys because of fine microstructure and of decrease in defect size due to squeeze-casting. Fatigue crack initiation site was at the eutectic silicon particle on the specimen surface or at microporosity in the specimen. Crack initiation life was successfully estimated from the evaluation of initiation site by the fracture mechanics and the statistics of extrema. Small fatigue crack growth of two kinds of alloys obeys the relation proposed by H. Nishitani et al. , that is d(2c)dN= C(σ_a/σ_B)^n(2c), where σ_B is the ultimate tensile strength. It was pointed out that an improvement of fatigue strength in cast aluminum alloy can be expected by refining eutectic silicon rather than by increase of static strength

Material Characteristics, Processing and Utilization of Dehulled Adlay

由於薏仁的營養價值高又對人體具有特殊生理機能，故自古以來不僅被用為滋養強壯齊j ，亦為漢藥方的重要材料。在中國和日本的民間療法中，薏仁被認為具有健脾益胃、利尿、消炎和抗腫瘤等功效。在近代醫學報告上，已證實薏仁中含有抗腫瘤的薏仁醋，降血糖的水溶性多醣，可抗過敏的含酚類化合物，以及新抗菌物質等特殊生理機能性成分。薏仁的加工產品雖然種類很多（例如薏仁茶、薏仁醋、薏仁雪花片、福康等），但其產量不大。薏苡適合國內種植，因此發展薏苡加工業似乎值得重視。 Dehulled adlay has long been used as nourishment foods and traditional Chinese medicine due to its high nutritional value and physiological effect on human body. It is recognized that it has stomachic, diuretic, antiphlogistic, and anti-tumor effects in the folklore in China and Japan. Modern medical reports have confirmed that it contains anti-tumor component (coixenolide), water-soluble polysaccharides ( coixans ) ,that can lower plasma glucose level, anti-histamine constituents (benzoxazinoids) and new antimicrobial substances (coixindens), etc. Many kinds of processed foods such as tea, vinegar, flakes and “Fukan” have been produced in Taiwan, but their production scale is not very large. Adlay is suitable for cultivation here; therefore,it seems worthy to build up an adlay industry

国道315线病害治理与生态环境保护的研究

《国道315线病害治理与生态环境保护的研究》涉及病害调查、气象研究、水毁病害研究、生态环境评价及保护措施、病害治理技术措施应用等内容。该项目丰富和拓展了历史洪水计算和设计洪水计算的方法和基础理论;提出了适宜于该区域路基局部冲刷深度和宽度计算公式;制定了新疆南疆地区公路水毁防治组合防护结构设计施工方法;提出干旱区公路路域工程生态环境区划原则与方法;建立了干旱区公路路域工程生态环境风险评价的方法与指标体系。该项研究成果对315国道的改建工程具有重大的应用价值,另外,亦可完善和补充目前国内在防治公路水毁、沙害、盐渍土病害等方面存在的不足。该项目成果为公路建设提供技术支撑,并通过工程实际应用可直接产生..