球碳

本文系统地论述球碳C_(60)的结构及其基本性质等,展望其在商业领域的应用。     

Productivity impact of technology spillover from multinationals to local firms: Comparing China's automobile and electronics industries

This study compares the impact of innovative activities of multinationals on local firms in China's automobile and electronics industries. In the automobile industry we find that both multinationals and local firms in the assembly industry have vertical spillovers to local parts supply firms. In contrast, in the electronics industry, only a small amount of vertical spillover effects from local firms can be found. Furthermore, we find that horizontal spillovers exist in neither the automobile industry nor the electronics industry.     

HSP27和HSP70mRNA在大肠癌中表达的临床意义

目的:探讨HSP27和HSP70 mRNA在大肠癌中表达的临床意义。方法:取大肠癌标本77例,采用免疫组织化学方法检测HSP27的表达状况,从中选取36例手术标本,采用核酸原位杂交技术(ISH)检测HSP70 mRNA的表达。结果:HSP27和HSP70 mRNA在大肠癌中的阳性率分别为40.3%和66.9%,HSP27和HSP70 mRNA均与大肠癌的分化程度相关,与发生部位、浸润深度及淋巴结转移无明显相关性。结论:检测HSP27和HSP70 mRNA可作为大肠癌患者预后的一个重要指标。     

IPv6技术及其发展

阐述了新一代Internet协议—IPv6的基本特点；讨论了IPv4过渡到IPv6的几种方案；介绍了IPv6技术的发展现状。     

嘧啶水杨酸类除草剂中间体2-氯-4,6-二甲氧基嘧啶的合成研究进展

综述了国内外近年来农药中间体2-氯-4,6-二甲氧基嘧啶的合成研究进展.介绍了以丙二睛、硝酸胍与丙二酸二乙酯为原料的合成工艺路线和研究水平.分析比较了各种合成方法的优缺点,展望了合成2-氯-4,6-二甲氧基嘧啶的工业化发展前景.     

Correlation of matrix metalloproteinase-2, −9, tissue inhibitor-1 of matrix metalloproteinase and CD44 variant 6 in head and neck cancer metastasis

This study aimed to explore the molecular mechanism in tumor invasion and metastasis. The expression of matrix metalloproteinase-2, −9 (MMP-2, MMP-9), tissue inhibitor-1 of matrix metalloproteinase (TIMP-1), cell adhesion molecule 44 variant 6 (CD44v6), HER2/neu and p53 was investigated in 154 patients with head and neck squamous cell carcinoma (SCC) by ABC and ImmunoMax immunohistochemical method. Their clinical relevance and correlation were analysed. The expression of MMP-2, MMP-9, TIMP-1, CD44v6, HER2/neu and p53 was found in cancer cells in 87.01%, 85.71%, 68.18%, 98.05%, 55.19% and 50.65% cases respectively. Linear regression and correlation analysis revealed that there was close positive relationship (P<0.05) between the expression of MMP-2 and MMP-9, TIMP-1 and CD44v6, HER2/neu and MMP-9, MMP-2 and p53. Up-regulation of MMP-2 was accompanied by advanced T stage (P<0.01). There was also a trend of MMP-2 expression being related with tumor metastasis. Increased expression of HER2/neu was found in patients with tumor recurrence (P<0.05). The expression of TIMP-1 was higher in laryngeal cancer than that in pharyngeal cancer, and higher in keratinizing and non-keratinizing SCC than that in basaloid SCC (P<0.05). These findings suggested that MMP-2 and MMP-9, HER2/neu and MMP-9, MMP-2 and p53 had a coordinate function in aggression of tumor; that MMP-2 had a more important function than MMP-9 in tumor invasion and metastasis; and that HER2/neu might serve as a biomarker for poor prognosis in HNSCC. Project supported by Lübeck Medical University, Germany     

商务英语专业学生基础阶段面临的问题及研究对策--CBI的实证研究

CBI是一种将教学内容依托在语言形式上进行二语或外语教学的教学方法。它不是围绕语言大纲或其他形式的大纲组织教学,而是围绕着学生即将学习的内容或信息组织教学。其目的不仅是对教学内容进行传输,更重要的是在二语/外语学习过程中,对学习者语言技能加以训练,培养他们正确使用语言进行交流的能力。     

欧盟数字化长期保存研究态势分析

计算机技术和互联网的发展产生了大规模的数字化对象,如何长期保存这些大规模异质数字化资源,受到了欧盟国家的广泛关注。欧盟委员会每年投入大量经费资助国家级大型存储机构进行数字化长期保存研究。本文以欧盟委员会在第六和第七框架中资助的22项数字化长期保存项目为代表,从资源、研究重心、智能工具和方法等八个方面进行分析,揭示目前欧盟数字化长期保存研究的总体态势:资源类型增多且结构日趋复杂,研究重心从基础概念转向对智能工具方法以及语义技术的研究,从OAIS参考模型转向对工作流以及资源生命周期管理模型和框架的研究,测试平台涉及学科领域更为广泛,而且很多机构加大了对资源的审计研究。参考文献13。     

移动IPv6的主机漫游改进技术

文章针对移动通信业务的飞速发展及当前使用的互联网通信协议IPv4的不足,结合下一代互联网通信协议IPv6自身在移动性、安全性和QoS控制等方面的特征,讨论了移动IPv6的应用前景。并且通过一个具体的方案实施,较为详细地介绍了移动IPv6的工作原理和基于移动IPv6的主机漫游技术。     

基于Cisco7603路由器实现IPv4/IPv6高校网络

分析了IPv4/IPv6三种过渡技术：隧道技术、双协议栈技术、翻译技术（NAT-PT）,给出高校网络的IPv6升级方案,重点讲述了基于Cisco 7603的IPv6路由技术和IPv6的安装、配置方法。