气体催化裂解法制备高纯碳纳米管的研究

利用有机气体化学裂解技术 ,用二甲苯作碳源 ,二茂铁作催化剂 ,噻吩作助长剂 ,氢气作载气 ,对碳纳米管的制备进行了研究 .研究结果表明 ,二甲苯流量、氢气流量及有机气体裂解温度等工艺参数对碳纳米管的产量及形态有很大的影响 ;在反应温度为 10 0 0～ 110 0℃ ,氢气流量为 15 0mL·min- 1,二甲苯的流量为 0 .12 1mL·min- 1时 ,能获得直径为 4 0～ 10 0nm的碳纳米管 ,碳纳米管的纯度可达 95 %以上 .     

4ФFDPSK高频调制解调器的MAP准则同步方案

本文提出了利用MAP准则实现短波数字调制、解调器的同步方案,导出了提取同步信息的表达式。最后,对此方案进行了计算机模拟,根据模拟结果对方案的性能进行了分析。从理论上实践上证实了方案的可行性。     

成本在心中效益在手中--山西汾西矿业(集团)水峪煤矿有限责任公司成本管理浅析

从材料的消耗，电力的消耗，管理费用的控制3个方面阐述了成功的成本管理给企业带来的经济效益，指出降低成本是企业力求发展的重要途径，管理是企业永恒的主题。     

Fibulin-5/DANCE is essential for elastogenesis in vivo.

The elastic fibre system has a principal role in the structure and function of various types of organs that require elasticity, such as large arteries, lung and skin. Although elastic fibres are known to be composed of microfibril proteins (for example, fibrillins and latent transforming growth factor (TGF)-beta-binding proteins) and polymerized elastin, the mechanism of their assembly and development is not well understood. Here we report that fibulin-5 (also known as DANCE), a recently discovered integrin ligand, is an essential determinant of elastic fibre organization. fibulin-5-/- mice generated by gene targeting exhibit a severely disorganized elastic fibre system throughout the body. fibulin-5-/- mice survive to adulthood, but have a tortuous aorta with loss of compliance, severe emphysema, and loose skin (cutis laxa). These tissues contain fragmented elastin without an increase of elastase activity, indicating defective development of elastic fibres. Fibulin-5 interacts directly with elastic fibres in vitro, and serves as a ligand for cell surface integrins alphavbeta3, alphavbeta5 and alpha9beta1 through its amino-terminal domain. Thus, fibulin-5 may provide anchorage of elastic fibres to cells, thereby acting to stabilize and organize elastic fibres in the skin, lung and vasculature.     

Intramammary expression and therapeutic effect of a human lysozyme-expressing vector for treating bovine mastitis

To develop a gene therapy strategy for treating bovine mastitis, a new mammary-specific vector containing human lysozyme (hLYZ) cDNA and kanamycin resistance gene was constructed for intramammary expression and clinical studies. After one time acupuncture or intracisternal infusion of healthy cows with 400 μg of the p215C3LYZ vector, over 2.0 μg/ml of rhLYZ could be detected by enzymatic assay for about 3 weeks in the milk samples. Western blotting showed that rhLYZ secreted into milk samples from the vector-injected cows had molecular weight similar to that of the natural hLYZ in human colostrums. Twenty days after the primary injection, the quarters were re-injected with the same vector by quarter acupuncture and even higher concentrations of rhLYZ could be detected. Indirect competitive ELISA of milk samples showed that the vector injection did not induce detectable humoral immune response against hLYZ. Clinical studies showed that twice acupuncture of quarters with the p215C3LYZ vector had overt therapeutic effect on clinical and subclinical mastitis previously treated with antibiotics, including disappearance of clinical symptoms and relatively high microbiological cure rates. These data provide a solid rationale for using the vector to develop gene therapy for treating bovine mastitis.     

2004-2005赛季NBA常规技术统计与特点分析

应用关联分析和B型关联分析对NBA比赛中的13项技术指标进行了数据分析．结果表明，从总体作用上看，命中率因子对于比赛的最终结果影响较大，但从作用的稳定性上看，除投篮命中率外，罚球次数、后场篮板球、盖帽等技术对获胜也有着相当稳定的贡献．同时，通过对分类技术因子的关联分析阐述了进攻、防守和失误之间的相互关系，从而对提高或避免其它有利或不利技术指标有一定的借鉴作用．     

略论网络时代高校思想政治工作

网络技术的发展给高校思想政治工作带来了难得的机遇，同时也面临严峻的挑战。面对机遇和挑战，高校思想政治工作者必须积极应对，趋利避害。充分发挥网络的积极作用，加强和改进高校思想政治工作。     

英汉交际语差异及其原因初探

文章就日常生活中一些较为典型的交际情景，对英汉交际语的差异及其潜在原因作了探讨。