A scanning laser microscope system to observe static and dynamicmagnetic domain behavior

Scanning laser microscopes (SLMs) have been used to characterize the magnetic properties of materials for some time. The first SLM built was a purely static system capable of imaging magnetic domains. Dynamic capability was introduced with the development of the R-Theta microscope. However, this microscope utilizes a rotating drive. A scanning laser microscope has been designed to observe the dynamic behavior of domain switching during the thermomagnetic write process and the subsequent magnetization state (domain orientation) in stationary media, without the requirement for a rotating drive. It may also be used to write to the magneto-optic (MO) disk material thermomagnetically prior to imaging. Images are derived from the longitudinal and polar magneto-optic Kerr effects. In this paper, the different configurations for imaging are described and some initial images are presented     

关于标准铂电阻温度计的检定规程的修订

本文介绍标准铂电阻温度计规程修订的原因、依据和修订的内容以及要达到的目标。     

Estimation of performance measures for product form cellular mobile communications networks

Telecommunication Systems - This paper investigates cellular mobile communications networks. The purpose of the paper is twofold. First, it is shown that the restrictive assumption of reversible...     

1．2—24K（ITS—90）国家温度工作基准组的建立

介绍了1．2－24K（ITS－90）国家温度工作基准组的建立及不确定度的分析，并对工作基准组进行了考核，用从NPL引进的5支铑铁电阻温度计的平均值作为1．2－24K温区的标准，实验分析表明，工作基准组在1．2－24K温区的总不确定度为2.7mK.     

Cluster computing and grid 2005 works in progress

The first in a two-part series of works-in-progress articles from cluster computing and grid 2005 deals with a project called Grid-Oriented Storage (GOS). GOS aims to support advanced data bank services and data reservoirs so that multiple computers and end users can share data on the grid. The second part deals with a dynamic estimation scheme for fault-free scheduling in grid systems.     

Energy–delay tradeoff in a two-way relay with network coding

A queueing model for a relay in a communication network that is employing network coding is introduced. It is shown that communication networks with coding are closely related to queueing networks with positive and negative customers. The tradeoff between minimizing energy consumption and minimizing delay for a two-way relay is investigated. Analytical upper and lower bounds on the energy consumption and the delay are obtained using a Markov reward approach. Exact expressions are given for the minimum energy consumption and the minimum delay that are attainable.     

Identification of polypeptides of the carbon metabolism machinery on the two-dimensional protein map of Saccharomyces cerevisiae. Location of 23 additional polypeptides

Using a modification of the basic two-dimensional polyacrylamide gel electrophoresis technique, we have undertaken a systematic identification of the polypeptides of the protein map of Saccharomyces cerevisiae corresponding to components of the carbon metabolism machinery. To the previous location of nine glycolytic enzyme polypeptides on the yeast protein map we add the location of 23 polypeptides. Ten of them were identified as corresponding to cytoplasmic enzymes of the carbon metabolism machinery and 13 were characterized as mitochondrial proteins. The criteria used to establish the identification of these polypeptides spots include migration with purified proteins, immunodetection, overproduction by plasmid–carrying strains and physiological behaviour.     

基于F18高精密电桥的温度计自动测量检定系统

本文介绍了在F18高精密电桥基础上，利用Visual Basic6．0，Access2000、Microsoft Excel及水晶报表为主要开发工具，以Windows为开发平台设计了一套完善的温度计自动测量检定系统。实验验证该系统提高了测量准确度及温度计检定的工作效率。     

Two-dimensional gel analysis of the proteome of lager brewing yeasts

Modern lager brewing yeasts used in beer production are hybrid strains consisting of at least two different genomes. To obtain information on the identity of the parental strains that gave rise to industrial lager yeasts, we used two-dimensional (2-D) gel electrophoresis and analysed the proteomes of different Saccharomyces species isolated from breweries. We found that the proteome of lager brewing yeasts and of the type strains of S. carlsbergensis, S. monacensis and S. pastorianus can be interpreted as the superimposition of two elementary patterns. One originates from proteins encoded by a S. cerevisiae-like genome. The other corresponds to a divergent Saccharomyces species whose best representative is a particular S. pastorianus strain, NRRL Y-1551. A map of industrial lager brewing yeasts has been established, with the individual origin of proteins and with identification of protein spots by comparison to known S. cerevisiae proteins. This 2-D map can be accessed on the Lager Brewing Yeast Protein Map server through the World Wide Web. This study provides the first example of the use of proteome analysis for investigating taxonomic relationships between divergent yeast species.     

Two-dimensional gel protein database of Saccharomyces cerevisiae

With the systematic sequencing of the yeast genome, yeast biology has entered a new era where novel challenges have to be faced. One challenge is the identification of the function of the several hundred novel genes discovered by genome sequencing. Another is to understand how all yeast genes act in concert to ensure and maintain cell organization. Two-dimensional (2-D) gel electrophoresis is the technique of choice to take up these challenges because it provides the opportunity of obtaining an overall view of genome expression. In prospect of these studies we have undertaken the construction of a yeast 2-D gel protein database that contains information on polypeptides of the yeast protein map. In this paper we report the information presently contained in this database. The reported information includes the identification of 250 protein spots and the characterization of polypeptides corresponding to N-terminal acetylated proteins, mitochondrial proteins, glucose-repressed proteins, heat shock induced proteins and proteins encoded by intron-containing genes. In all, 600 spots are annotated. These data can be accessed on the Yeast Protein Map server through the World Wide Web network.