纯植物栲胶鞣革工艺

详细介绍了纯植物鞣剂鞣革的工艺操作。主要包括:浸灰、鞣制池及转鼓进行鞣制,鞣质的分布与鞣液的移动以及底革生产时的半快速和快速鞣制工艺。     

非化学固化中空玻璃单道热熔密封胶研究进展

回顾了中空玻璃密封胶的发展历史,归纳分析了中空玻璃用非化学固化单道密封热熔胶的技术特点、发展状况和发展前景,指出含有氢化苯乙烯嵌段共聚物改性丁基橡胶的热熔胶是中空玻璃单道密封非化学固化热熔胶的发展方向。     

地下铁道单洞双层隧道施工技术研究

结合工程实例,针对地下铁道单洞双层隧道的特点,采用了浅埋暗挖法进行施工,通过工程实施和科研,研究了单洞双层隧道施工技术,并对几个施工难点作了论述,从而解决了单洞双层隧道施工中的一些问题。     

鞋底材料的中红外光谱可视化快速鉴别

借助中红外分析技术和化学计量分析,建立常见鞋底材料种类鉴别的分类模型,为鞋底种类鉴别提供有效的新方法。基于鞋底红外光谱矩阵数据,建立了层次聚类模型和K近邻模型。结果表明,K近邻模型中,43个样本分为7类,这与层次聚类模型中,组间平均距离为8时样本的分类结果一致;K近邻下,分类样本呈5个聚集区域,其中H、G、K 3类样本分布情况明显,相比较A类,E类分布较为集中,聚敛程度较大,L类分在E类,M类分在A类;模型总分类准确率达95.35 %,分类结果理想;选取各类中的一个样本,对其开展谱图解析,得到样本主要成分有顺丁橡胶、乙烯醋酸乙烯酯共聚物、聚氨酯、异戊橡胶、聚氯乙烯和苯乙烯丁二烯苯乙烯嵌段共聚物;中红外光谱技术结合化学计量分析可作为鞋底材料种类鉴别的一种无损、快速、准确的分析方法。     

Polyurethane microcellular elastomers: 1. Effect of chemical composition on tensile strength and elongation at break of poly(ethylene-butylene adipate) based systems

The relationships between tensile strength and elongation at break and the chemical composition of a microcellular elastomer used in shoe sole technology have been calculated using multiple linear regression analysis. Using the statistical Student's test, the importance of the factors that influence the above characteristics have been established. It has been found that the moulded density has the major influence on the tensile strength while the elongation at break depends to a great extent on the hard-segment dispersion into the soft matrix, as indicated by the influence of the water contents and the quasi-prepolymer index (I_NCO). Hydroxyl number in the usual range of 52–61 mg PKOH/g has no influence on the above characteristics.     

The pressure distribution under the bovine claw during square standing on a flat substrate

The distribution pattern of pressure over the bovine claw was investigated to test the hypothesis that the ground reaction force is unevenly distributed and makes some regions of the claw more prone to overloading and injury than others. In eight recently trimmed Holstein Friesian cows, the distribution of vertical pressure was measured during square standing with a spatial resolution of 2.6 sensors/cm2 and a temporal resolution of 313 measurements/s. In each animal, the localization of maximum pressure per foot and per claw was determined during five trials. In the front limb, maximum pressures were normally found on the medial claw; in the hindlimb they were located on the lateral claw. In both claws, the highest pressures were found on the sole of the foot and not on the wall. In the front limbs, maximum pressures were located in the posterior portion of the sole; in the hind limb in the anterior portion. There was no difference in the location of the maximum pressure between the medial and lateral claw in either limb. The regions in which these maximum pressures occur are known to be relatively susceptible to injuries. This could indicate a causal relation between the location of pressure concentrations and claw diseases found in clinical observations.     

利用逆向制造系统集成技术开发仿生防粘鞋底

利用扫描电镜观察土壤动物的典型体表形态,并提取其仿生信息。利用逆向制造技术和仿生改形技术探索了鞋底的黏附问题,并设计了试验系统。以球冠高度h、球冠底面圆半径r、球冠间距d、球冠分布形态σ为试验因素,采用L9(34)正交试验测试了土壤黏附力。对比试验表明:在同等试验条件下,某些仿生改形表面的鞋底具有十分明显的减黏脱附效果,当h=3.0 mm,r=4.0 mm,d=10.0 mm和σ为递增分布形态时,最多可降低黏附力8.27%。     

CPE/LDPE并用微孔鞋底的研制

本文介绍了氯化聚乙烯的结构与性能,以及氯化聚乙烯与低密度聚乙烯并用制造微孔鞋底的方法、同时考察了不同种类的橡胶改性剂、氯化聚乙烯与低密度聚乙烯的并用比、填料等对微孔鞋底物理机械性能的影响,并对实验结果进行了讨论。     

9FA燃机前台板倾斜原因分析及对策

文章介绍了9FA燃气轮机的基础台板结构及安装。在安装过程中出现了前台板倾斜,导致运行销无法安装的现象,其原因为:燃机定位后,过早割掉了连接前后台板的工字梁,导致燃机前台板倾斜,将运行销项在键上而无法取出。实践表明,工字梁的处理要在前台板完全固定后再进行。     

C中用指针动态建立单链表的几种方法

通常用数组可以实现线性表的顺序存储，但是，数组事先要定义固定的长度，并且所分配的存储空间是连续的。这样一来，就不能达到真正意义上的动态分配存储空间以及充分利用存储空间的目的；另外，用数组不利于实现线性表中结点的动态增加与删除。而用链表则可以弥补以上不足。本文主要以建立学生信息链表为例，分别介绍无头结点、有头结点单链表的逆序建立和顺序建立过程以及算法实现。