电子商务时代企业ERP系统的建设

本文通过深入的研究证明在电子商务的时代切实可行地加强企业ERP系统建设的重要性以及可行性,也通过在企业ERP建设的同时发现电子商务时代企业ERP系统建设的问题提出探讨,并提出相关意见及建议。     

虚拟制造技术发展策略浅析

通过分析虚拟制造技术的重大作用与其它先进制造技术的关系，从多方面论述了发展虚拟制造技术的策略及途径，希望为制造业的发展做些有益的探索。     

Nd:YAG激光、锶90β射线与压迫综合治疗耳垂增殖性瘢痕

目的：了解Nd：YAG激光、锶^90β射线与压迫综合治疗耳垂增殖性瘢痕的疗效。方法：将耳垂增殖性瘢痕病人69例分为两组，A组手术切除后采用Nd：YAG激光、锶^90β射线和压迫综合治疗，B组手术后仅使用锶^90β射线与压迫治疗，随访观察比较临床效果。结果：A组总有效率为82．86％，B组总有效率为67．64％。A组有效率高于B组。结论：手术后采用Nd：YAG激光、锶^90β射线和压迫综合治疗耳垂增殖性瘢痕效果明显。     

Inkjet printed silver source/drain electrodes for low-cost polymer thin film transistors

Silver tracks for source/drain (S/D) electrodes in low-cost polymer thin film transistors (TFTs) have been realized through inkjet printing technique, using heavily n-doped silicon wafer with thermally grown silicon dioxide as the substrate and poly(3-hexylthiophene) (P3HT) as the channel material. Spin coating a layer of poly-4-vinylphenol (PVPh) onto the substrate was found to enhance the silver track uniformity and lower the cure temperature (from 300 to 210 °C). The surface roughness of the PVPh film was optimized to improve the device performance. The fabricated P3HT TFT with a channel length of 20 μm exhibited a saturation mobility of 3.5 × 10⁻2 cm²/V/s which was three times higher than that obtained in P3HT TFTs with gold S/D electrodes.     

中国电子产业上市公司发展研究

电子产业的发展,不但取决于电子技术本身的发展,也取决于整个电子产业集群的不断发展。对于电子产业发展的研究与电子技术本身的研究、推动电子产业的发展具有同等重要的意义。产业的发展取决于一个个微观意义上的企业的整体表现。本文利用CSMAP上市公司数据库,对代表电子产业的约40家大型企业进行分析研究,得出以下结论：中国电子产业的资产集中度偏低,产业资产更新水平与盈利能力较好,盈利水平很低,在与其他行业的比较中,电子产业具有一定的优势,电子产业的进一步繁荣发展,需要进一步提高行业盈利水平和产业集中程度。     

网络不良信息呈多元化发展

2月17日,网康科技在京发布了《中国互联网“不良信息”研究报告（2008）》。报告显示,据网康互联网内容研究实验室的统计表明,目前网络不良信息的多元化趋势已经非常明显,主要集中在违反法律、违反道德、破坏信息安全3大类别。根据不良信息的活跃度,赌博、假证件办理、代写论文、黑客网站、色情淫秽等信息已成为不良信息的最主要内容。     

金融危机，效率为王——Array Networks助力企业挖掘IT体能提高IT效率

有人说金融危机来了,有人说新一轮的发展机遇不远了,总之这是一个危险与机遇并存的年代。     

基于MIMO技术的WMN MAC协议研究

分析了MIMO技术中由于通信链路间干扰导致网络吞吐量降低的问题,提出了一种基于多模多信道技术的改进MAC协议(MPRP-MAC),利用节点中的多个通信模块以及多个正交信道资源,使节点可以在无干扰的情况下实现接收与发送同时进行。实验结果表明,该技术可充分利用天线资源,有效提高系统容量。     

Concentric Sub‐micrometer‐Sized Cables Composed of Ni Nanowires and Sub‐micrometer‐Sized Fullerene Tubes

Highly ordered arrays of submicrometer‐sized coaxial cables composed of submicrometer‐sized C₆₀ and C₇₀ tubes filled with Ni nanowires are successfully prepared by combining a sol–gel method with an electrodeposition process. The wall thickness of the submicrometer‐sized tubes can be adjusted by the concentration of fullerenes and the immersion time. The thermal stability of the submicrometer‐sized C₆₀ tubes is studied by Raman spectroscopy and it is found that these structures can be easily decomposed to form carbon nanotubes at relatively low temperatures (above 573 K) in an alumina template. These novel coaxial cable structures have been characterized by transmission electron microscopy (TEM), high‐resolution TEM (HRTEM), scanning electron microscopy (SEM), field‐emission SEM (FESEM), Raman spectroscopy, elemental mapping, energy dispersive X‐ray (EDX) spectroscopy, X‐ray diffraction (XRD), vibrating sample magnetometer (VSM) experiments, and superconducting quantum interference device (SQUID) measurements. Magnetic measurements show that these submicrometer‐sized cables exhibit enhanced ferromagnetic behavior as compared to bulk nickel. Moreover, submicrometer‐sized C₇₀/Ni cables show uniaxial magnetic anisotropy with the easy magnetic axis being parallel to the long axis of the Ni nanowires. C₇₀/Ni cables also exhibit a new magnetic transition at ca. 10 K in the magnetization–temperature (M–T) curve, which is not observed for the analogous C₆₀/Ni structures. The origin of this transition is not yet clear, but might be related to interactions between the Ni nanowires and C₇₀ molecules. There is no preferred magnetization axis in submicrometer‐sized C₆₀/Ni cables, which implies that the Ni nanocrystals have different packing modes in the two composites. These different crystalline packing modes lead to different magnetic anisotropy in the two composites, although the Ni nanocrystals have the same face‐centered cubic (fcc) structure in both cases.     

数字卫星电视纠错编码技术的比较及应用

介绍数字卫星电视广播使用的纠错编码技术和该技术在数字卫星电视广播中的具体应用,比较它们的纠错能力和在DTTB系统中的主要特性,给出最新的纠错编码技术.