基于平面应变模型的固化变形计算

基于三维模型的固化变形分析建模复杂且计算效率偏低。本文根据典型航空结构的固化受力特征,结合正交各向异性材料的平面应变理论,提出了一种用于固化变形计算的平面应变模型。通过与文献结果地比较,表明本文所提出的模型合理,基于平面应变模型的固化变形计算方法有效。     

Effect of Plasma Treatment on the Structures and Properties of Konjac Glucomannan Film

To understand the effect of plasma treatment on the Konjac glucomannan film, the nitrogen plasma was injected into the film by ion beam injection machine in this study. The structures and properties of Konjac glucomannan film after plasma treatment were analyzed by Infrared spectroscopy, Raman spectrum, X-ray, ect. The result showed that nitrogen groups appeared in the KGM molecular chain and part of this chain fractured, and the number of hydrogen bonds increased after the treatment of plasma. The form of KGM molecule remained amorphous non-crystalline state, but the crystalline region was increased and became more ordered. The mechanical property of tensile strength and breaking elongation was improved, while the WVP was decreased. The nitrogen groups were grafted on the KGM molecular chain after plasma treatment, which led to the improvement of the properties of KGM film.     

开展校级电子竞赛 培养学生创新能力

学科竞赛是培养在校大学生工程素质和实践创新能力的有效载体,有着常规教学不可及的特殊创新教育功能。而对于大多数地方高校,能够参加省级、国家级学科竞赛的学生毕竟是少数。介绍了沈阳工业大学"电子技术基本技能大赛"的组织、实施过程。通过构建学科竞赛的长效机制,扩大学生参与面,引导学生重视创新精神和实践能力的培养。实践效果表明,学生的兴趣与自信心、创新意识与创新能力、系统概念等都有了一定程度的提升。竞赛的开展也促进了理论教学与实践教学的全方位改革。     

长锥形光纤装置的研制

利用微机与步进电机相结合的技术,控制常用的双坩埚光纤拉丝机出丝管口的直径大小和鼓轮转速快慢,实现了数控拉制1~2 m长锥形光纤的新方法,并且利用传播模式分析了拉制方法的优劣.     

魔芋生物碱的纯化与结构表征

魔芋飞粉通过 95 %工业酒精提取 ,三氯甲烷和正丁醇分别萃取后 ,进行氧化铝干柱层析和高效液相色谱层析纯化获得了纯样品Ⅰ ,Ⅱ .对纯样品Ⅰ进行了傅里叶红外 (IR)、氢核磁共振 (1HNMR)、质谱 (MS)分析 ,并对其图谱进行解析 ,推断样品Ⅰ是一种 5—甲基咪唑的衍生物 .     

碱提法回收猪骨蛋白质的探讨

对碱提法回收猪骨蛋白质工艺参数的研究表明，4种工艺参数对蛋白质得率均有不同程度的影响。其顺序为浸提液pH＞浸提时间＞沉降pH＞浸提温度。碱提法回收猪骨蛋白质的最高得率为25．7％，最佳工艺参数为浸提时间105min，浸提液pH12．0，浸提温度30℃和沉降pH5．0。     

Formation Mechanism and Stability Study of Konjac Glucomannan Helical Structure

The formation mechanism and stability of konjac glucomannan (KGM) helical structure were investigated by molecular dynamic simulation and experimental method. The results indicate that the molecular conformation of KGM is a non-typical helical structure. In detail, helical structure of KGM is mainly sustained by acetyl group, whose size and stability are affected by the molecular polymerization degree of KGM. In vacuum among the non-bonding interactions, electrostatic force is the greatest factor affecting its helical structure, but in water solution, hydrogen bond affects the helical arrangement greatly. To our interest, temperature exhibits a reversible destroying effect to some extent; the helical structure will disappear completely and present a ruleless clew-like arrangement till 341 K. This work suggests that the method of combining molecular dynamic simulation and experiment tools can be effective in the study of KGM helical structure.     

魔芋葡甘聚糖对CCl4所致小鼠肝损伤的保护作用

研究了魔芋葡甘聚糖（KGM）对CCl4致小鼠实验性肝损伤的保护作用,并探讨了其作用机制。基于CCl4皮下注射制备肝损伤小鼠模型,分别用3种不同浓度的魔芋葡甘聚糖（KGM）进行干预,观察检测小鼠血清谷丙转氨酶（ALT）、谷草转氨酶（AST）、血清白蛋白与血清球蛋白的比值（A/G）、肝组织匀浆超氧化物歧化酶（SOD）和丙二醛（MDA）含量。结果表明：魔芋葡甘聚糖（KGM）干预给药能降低CCl4所致小鼠血清中异常增高的ALT,AST;升高CCl4所致小鼠血清中异常降低的A/G比值;魔芋葡甘聚糖（KGM）干预给药能使肝损伤小鼠肝匀浆异常降低的SOD含量上升,异常增高的MDA含量下降。魔芋葡甘聚糖（KGM）对小鼠实验性肝损伤具有一定程度的保护作用。     

分子量对KGM片段流变特性的影响研究

为了研究分子量对魔芋葡甘聚糖流变性质的影响,本文采用辐照降解制备KGM片段(G1,G2,G3和G4)并测定其流变性质,结果显示,随着分子量的降低,KGM的黏度明显减小;G1,G2和G3样品在水溶液中的黏度随着剪切速率的增加而减低,呈明显的假塑性;G4的黏度基本上不随剪切速率的变化而变化,呈现出近似牛顿型流体的流动特性.从动态粘弹性实验还可以看出,随着分子量的降低,KGM样品溶液体系表现为以弹性占主导地位,这种性质主要是因KGM分子量降低后,分子间的无规缠绕被破坏所至.     

响应面法优化杨梅原花青素提取工艺

为优化杨梅原花青素的提取工艺参数,通过单因素实验,采用响应面法研究乙醇浓度、料液比、提取时间和温度等对杨梅原花青素提取的影响,以原花青素提取率为评价指标,通过Box-Behnken组合,建立杨梅提取的二次回归方程,得到最优提取条件.结果表明,杨梅原花青素提取得率的影响的顺序为:乙醇浓度温度时间料液比;杨梅原花青素的最佳提取工艺条件为:乙醇浓度为92%,提取温度75℃,提取时间57 min,液料比选取25:1(m L/g).该条件下,杨梅原花青素提取率的为30.03 mg/g.