纺纱系统的选择

如何选择纺纱方法?能否用新的纺纱系统代替环锭纺?本文对此作些分析。 1.环锭纺至少在公元2000年以前能保持现时世界范围的锭子水平。 2.每年大约仍然有250到300万纱锭在安装着。 3.环锭纺的生产率将继续保持着每隔20年增加一倍的趋势。这些情况是由Schlabhorst公司执行副经理Josef Derichs博士最近一篇分析纺纱工     

Fe-Si-O系统中各矿物的热力学性质

序言Fe-Si-O系统包括三个重要的元素.人们对该系统的矿物平衡作深入研究,是了解许多地壳、地幔和地核环境的先决条件.而这方面的资料对有关陨石、月球和行星的问题也是有意义的.Bowen等(1932)首先在1个大气压下对FeO-SiO_2系统作熔融实验,并表明了实验结果在岩石学上的意义.为了防止氧化作用,所用原料应盛在铁坩埚内,并在炉内通入氮.在     

连铸过程中钢水的连续真空处理

连铸过程中铜水的连续真空处理技术是作者联合研制出来的一项新的真空处理技术，已在前苏联首家投入使用。应用此项技术，工艺布置紧凑、投资省、占地面积小、操作方便，脱气效果比其他真空处理方法明显优越，是一项值得推广应用的新技术。     

DANARC技术

Danarc,达涅利电弧炉技术是指:带有喷吹氧和碳用的炉底风口的高阻抗技术,同时配以氧枪,以及供传统操作和后燃烧用的侧壁烧嘴。Danarc概念在能源的选择上提供了充分的灵活性。概念的基本原理是:具有高效的电能和可选能量的供给系统。从Danarc电炉在意大利的Ferriers Nord公司操作结果表明,作为电能的替代,喷入非常大量的氧和碳是可能的。 原料中金属回收率不受大量的吹氧量的影响。因为渣中的Fe氧化物含量是受喷入的C在渣中的平衡值控制的。 通过一个固定的或饱和的电抗器供电是有益的,因为甚至在高电压,低电流状况下操作也能得到稳定的电弧。所以,高阻抗操作会带来低的电极消耗,减少电损耗,及减小供电网络的干扰,也就是闪烁。饱和电抗器带来最好的结果。因为在这种情况下,附加的电抗器不断调整,保证一个合适和需要的量以使电流保持恒定。     

e-LITE： A Concurrent Engineering Method Dedicated to E-learning Training Development for the Enhancement of Research Project Results

Scientific research projects aim to produce new knowledge generally in domains of high specialization.Some of these projects have goals of improving the performance of companies.In this case,the issues of the capitalization and transfer of scientific knowledge and its rapid transformation into professional skills are directly addressed.However,there is no method to derive e-learning teaching material from project results.So,this paper presents the e-LITE Method and its application to the ISTA3 project to support the process of developing a e-learning training.This application has allowed us to highlight the contributions of the method that promotes better knowledge sharing between partners of a research project and the development and transfer of research results to the professional world.So,after the presentation of the method,an application to the ISTA3 project will be presented.     

An automated, parallel processing approach to biomolecular sample preparation

Sample preparation for DNA and RNA assays is a prime candidate for laboratory automation. A novel, parallel processing device that performs the three separate liquid-handling functions necessary for such sample preparation-dispensing, pipetting, and pressurizing-is presented. The device comprises an array of fine nozzles connected by fluidic channels to automatically and precisely distribute flow between one source and an array of points. The design principles, as well as the experimental and computational methods used to develop the device, are described. Test results, including accuracy, uniformity, volume range, and timing, are presented. The functionality of the device is demonstrated by performing a solid-phase extraction of DNA with two types of microcolumns.     

Cholesterol screenings: is there a return on investment?

Community outreach programs like health screenings will face increasing scrutiny as attempts to reconcile expenses and revenues intensify. If you cannot supply evidence that a screening program can generate new revenue, that program might be written off as a loser. Providing the evidence is not as difficult as you might think; it requires planning and the resourceful use of software you may already have available.     

Optimizing ultrasonic transducers based on piezoelectric composites using a finite-element method

A novel approach to understanding the vibratory behavior of composite piezoelectric materials is proposed. Elementary ceramic rods, and the effects of their width-to-thickness (W/T) ratio are studied. A model based on the finite-element methods is used. Some experimental results that agree well with the computed data are presented. Plots of resonant frequencies and coupling coefficients versus W/T are given that can be used in transducer design.