一种计算冲压零件轮廓相似度的快速算法

为了适应网络应用对轮廓相似度计算在速度和数据传输量方面的要求,文中提出了一种非离散的快速算法,该算法采用直线和圆弧来表达轮廓曲线．在对图形进行范化处理后,将待匹配轮廓按照一定步距进行旋转．然后依次以待匹配轮廓或目标轮廓作为模板,计算模板的所有顶点与其在另一个轮廓中对应点的距离平方的平均值．在所有角度中,平均值之和的最小值即为两个轮廓的匹配度．该算法同时适用于凸多边形和凹多边形,并具有较好的区分度和匹配准确性．和以往的离散方式相比,该算法减少了需要传递的数据量．提高了运算速度．     

The multifaceted role of periostin in tumorigenesis

Periostin, also called osteoblast-specific factor 2 (OSF-2), is a member of the fasciclin family and a disulfide-linked cell adhesion protein that has been shown to be expressed preferentially in the periosteum and periodontal ligaments, where it acts as a critical regulator of bone and tooth formation and maintenance. Furthermore, periostin plays an important role in cardiac development. Recent clinical evidence has also revealed that periostin is involved in the development of various tumors, such as breast, lung, colon, pancreatic, and ovarian cancers. Periostin interacts with multiple cell-surface receptors, most notably integrins, and signals mainly via the PI3-K/Akt and other pathways to promote cancer cell survival, epithelial–mesenchymal transition (EMT), invasion, and metastasis. In this review, aspects related to the function of periostin in tumorigenesis are summarized.     

互联网时代的“数字化校园”建设与高校管理工作的思考

随着互联网的飞速发展,教育界掀起了一股数字化校园建设热潮,众多的学校纷纷投入到其中,架构在网络环境上的＂数字化校园＂成为学校信息化建设的重点。搞好校园网络建设,构建现代化的教育环境,成为教育现代化的重要内容,也是形成现代教育办学体系的重要组成部分。我们的数字化校园建设是要以网络技术、多媒体技术等现代化信息技术为手段、以提高教育教学工作效率为目的,实现资源的有效整合和优化,从根本上转变教育教学和管理模式与方法。因此,我们要从根本上转变思想,建立与完善现代化管理意识的校园网络;同时,加强师资队伍建设,培养一支素养高、勇于创新、善于运用现代化技术的教师队伍。     

A bioinformatic evaluation of potential allergenicity of 85 candidate genes in transgenic organisms

The potential of genetically modified organisms(GMOs) to increase allergenicity or predispositions to allergies has attracted much attention.An approach that will properly and holistically evaluate the allergenicity of GMOs is yet to be found.Here,85 transgenes that have been reported in both international and domestic studies during recent years are summarized case by case;49 of the transformed genes were from plant sources and 36 were from animal sources.EVALLERTM,a web server for the in silico assessment of potential protein allergenicity,was used to evaluate the potential of the transgenic proteins as allergens.The biomedical journals listed in Highwire(http://highwire.stanford.edu/) were searched and reviewed to decipher whether any of the transformed genes were linked to allergenicity or human health.The EVALLER analysis identified 5 allergenic genes,whilst our literature review found 11 genes that were either related to allergic cases or to clinical adverse events;all 16 of these genes have been used in GMOs.The analysis pathway that we have developed can help guide the selection of genes to be used in genetic modification.The pathway also provides a paradigm for allergenicity analysis of transgene candidates.     

超声波振动切削装置实用设计研制法概要

本文简要介绍超声波振动切削装置设计研制的基本原则和实用设计研制方法。介绍了振动切削用发生器的性能特点及其保证方法,磁致伸缩换能器、变幅杆和弯曲振动杆等谐振元件的简便准确算法及设计、制造中的一些问题,可拆卸元件连接的基本原则和模式,谐振元、部件和装置的测试和试验方法。指出装置安装调试注意事项。对存在问题和努力方向作了探讨。比较系统地介绍了有关的文献资料。     

线性步进频率编码信号特性的研究

通过理论分析和实际计算,对线性步进频率编码信号(LSDFC)的模糊图、多普勒灵敏性和分辨力等特性进行了研究。结果表明这种信号易于产生和处理,适合用于要求大时宽大带宽的场合。     

二阶线性中立型微分差分方程非振动解的类型与判别

本文讨论了二阶线性中立型微分差分方程d~2/dt~2[x(t)-cx(t-τ)]+px(t-σ)=0的非振动解的所有类型及其判别。     

相转移催化合成α－三氯代甲基苄原醇乙酸酯

阐述在合成α－三氯代甲基苄原醇乙酸酯及其主要原料α－三氯代甲基苄原醇中，采用相转移催化的基本原理和方法．考察反应时间、原料配比和催化剂用量对α－三氯代甲基苄原醇乙酸酯的影响．在反应时间为５ｈ，原料α－三氯代甲基苄原醇和乙酸酐的摩尔配比为１：１．２，无水醋酸钠催化剂和相转移催化剂（ＰＴＣ４＃）为α－三氯代甲基苄原醇摩尔数１０％时，其α－三氯代甲基苄原醇乙酸酯产率为７６％～８０％．     

高温烧成碳化硅制品的2．5m~3梭式窑

介绍２．５ｍ３高温梭式窑的窑体结构、砌筑材料及窑的技术特性。经生产使用，以轻柴油为燃料，合理燃烧，该窑温度可达１５００℃，为碳化硅制品生产建立了高温烧成设备。