由低品位Mamatwan锰矿生产高品位锰烧结矿的研究

由低品位Ｍａｍａｔｗａｎ锰矿生产高品位锰烧结矿的研究Ｐ．Ｃ．ＰｉｅｎａａｒＷ．Ｆ．Ｐ．Ｓｍｉｔｈ（Ｓａｍａｎｃｏｒ公司Ｍａｍａｔｗａｎ锰矿）南非拥有１３６亿吨Ｍｎ＞２０％的锰矿，是一个锰和铁合金的主要生产国。由于高品位锰市场不断竞争的增长需要，以及产...     

铝电解槽料箱排气管结构的优化改造

简要介绍了铝电解槽料箱排气管在原设计上存在的缺陷和不足，针对缺陷产生的原因进行了结构优化改造。     

让评测文章不再是天书（五）——看懂评测之音箱篇

音箱是构成PC多媒体系统的关键配件．因此关于音箱的评测也经常出现在各种媒体上。由于音箱评测不像CPU、主板、显卡等配件那样比较容易量化．因此音箱评测中的主观因素相对其他配件要多了很多，这也就给广大读者带来了麻烦——要看懂音箱评测报告还真不容易！     

1001个最佳免费软件——从Internet上下载

使用Net的最大好处并不在于访问漂亮的图片、恐怖的声音或成千兆字节的信息,而是因为那里有无数的免费软件可以随时下载使用。当然,有些东西是不值得花很长时间去下载的。因此,PC Computing的编辑们遍历了Internet,选出了1001个最佳的软件。我们从最小的个人页面直至Ziff-Davis Interactive的Shareware LibrarV这样的巨型网点都搜索了一遍,找出了令人惊叹的应用程序、激动人心的游戏和大量的热门软件。每一个软件都已装入了我们的Web节点:www.pccomputing.com,准备供您下载,对您来说再没有比这更简便的了。     

Behavioral Changes in Workers of the Leaf-Cutting Ant Atta sexdens rubropilosa Induced by Chemical Components of Eucalyptus maculata Leaves

The response of Atta sexdens rubropilosa Forel workers to essential oils, epicuticular wax and hexane, dichloromethane, ethyl acetate, and methanol extracts of Eucalyptus maculata was evaluated. Hexane extracts of E. maculata interfered with the recognition mechanism among workers. The main active compounds identified from this plant were the sesquiterpenes elemol and beta-eudesmol. These compounds may be responsible for the resistance of this species to ant attack.     

耐高负压聚四氟乙烯衬里设备、管道制作工艺

聚四氟乙烯衬里设备、管道，经常会因为内部负压产生内瘪，以至拉裂损坏。本文讲述了一种特殊制造工艺：将聚四氟乙烯衬里外表面处理后，采用特殊粘接剂，将其与钢外壳粘接起来，以防止负压，延长产品使用寿命。     

A generalized series approach to MR spectroscopic imaging

The problem of precise spatial localization of spectral information in magnetic resonance (MR) spectroscopic imaging is addressed. A novel method, called GSLIM (generalized spectral location by imaging), is proposed to make possible the marriage of high-resolution proton imaging with spectroscopic imaging and localization. This method improves on the conventional Fourier series inversion method used in chemical shift imaging (CSI) and the compartmental modeling method used in SLIM by using a generalized series framework for optimal representation of the spectral function. In this way, a priori information extracted from proton imaging can be used, as in SLIM, and the robustness and data consistency of CSI are also retained. Simulation results show that GSLIM can significantly reduce spectral leakage in CSI and inhomogeneity errors in SLIM. It can also reveal compartmental inhomogeneities, and can easily be extended to handle other a priori constraints when necessary. This approach, with some further development, may achieve an optimal combination of sensitivity, quantitative accuracy, speed, and flexibility for in vivo spectroscopy.