Baotou Iron and Steel Company

The Baotou Iron and Steel Company(BISCO) is located at Baotou,830 kilometerswest of Beijing,in the Inner MongoliaAutonomous Region.The ore deposit atBaiyun'ebo,on which the company is based,was discovered by geologist DING Daohengin 1927 and was later found to be rich inrare earth elements.An extensive prospecting campaignwas launched after the founding of the     

一种鲁棒的图像局部特征区域的描述方法

提出了一种鲁棒的图像局部特征区域的描述方法,即IWCS-LTP(Improved weighted center symmetric local trinary pattern)描述子.该方法对图像局部特征区域采用类似SIFT描述子的分块处理,可以使描述子包含更多的结构信息; 采用ICS-LTP算子进行编码,可以在不大量增加描述子维数和计算量的同时对图像的梯度方向信息进行更具体的描述; 采用加权纹理谱直方图计算方法可以使描述子包含图像的梯度幅值信息.大量的实验结果验证了该描述子的有效性.     

On the use of hardness tests to estimate the extent of plastic deformation

The standard hardness test result is dependent to some extent on the surface condition of the material being assessed. In particular, since the measurement involves permanent deformation of the surface the state of stress or strain in the material will influence the result. Consequently the hardness test may be used as an indicator of prior plastic deformation. The present investigation was concerned with the phenomenon of buckle propagation in undersea pipelines and a theoretical model of the collapse process was developed. The model predicted the extent of the developing plastic zones around the cross-section of the collapsing pipe. Hardness measurements on the cross-sections of collapsed pipe have been used to estimate the extent of the plastic zones and comparisons with the theoretical analysis are given.     

远程教育资源的描述、组织和管理系统设计

远程教育资源的描述、组织和管理系统是远程教育工程的核心，其中教育资源描述系统提出了教育资源的制定标准，这直接影响到资源库的质量，以及资源库的分布式管理与利用；教育资源组织系统主要实现基于知识点的资源组织构建功能，提供交互式的报文信息交换平台，能够实现异构应用系统以标准的信息格式在不同的教育资源库之间进行资源交流和通信；教育资源管理系统实现对各地按标准建立的教育资源库进行分布式管理和资源调度管理。     

Potential operational multi-satellite sensor mapping of snow cover in maritime sub-polar regions

Scottish snow cover as an example of a maritime sub-polar region has two principal problems for an operational monitoring programme: the often ephemeral nature of the snow cover, and the loss of direct access to snow imagery due to clouds. At present only the NOAA AVHRR series provides images with the required temporal and spatial resolutions. Based on the availability of data from the Dundee satellite data receiving station a range of NOAA-12, -14 and -15 day and night passes were collected and processed. Three snow cover products were produced from the NOAA AVHRR/2 data: snow area based on channel 134 ISODATA classifications, percentage snow cover based on multi-temporal Normalized Difference Vegetation Index (NDVI), and daily maximum snow surface temperature maps using split-window combinations of thermal channels. Noted improvements were evident in the accuracy and resolution of snow cover classifications based on provisional testing of AVHRR/3 data. Maximum snow surface temperature maps indicated a potential for mapping areas of snow melt. The principal limitation in the operational snow cover mapping with AVHRR, however, remains the loss of temporal resolution due to cloud cover.     

Critical temperature and critical current of thin-film superfluid3He

Superfluid³He film flow over the rim of a copper beaker has been measured. The flow rate was measured as a function of temperature and as a function of depth of³He below the rim or film thickness at the rim. The critical current, calculated from the flow rate, varied as (1 –T/T _c ^p )^3/2 as expected for pair-breaking;T _c ^p is a film-thickness-dependent critical temperature. However, the magnitude of the current was an order of magnitude smaller than expected for pair-breaking, in agreement with other experiments that have demonstrated a lower dissipation mechanism in superfluid³He. The suppression of the critical temperatureT _c ^p /T _c ^b , whereT _c ^b =0.93 mK is the bulk³He transition temperature, varied from 0.93 to 0.7 as the film thickness at the rim varied from 120 to 90 nm. These ratios are larger than expected from Ginzburg-Landau or microscopic theory of superfluid³He-B.Deceased 19 June 1987.     

冶炼炉变压器大电流引出及联结

介绍了冶炼炉变压器的大电流引出方法及引线结构，对出线铜排与短网铜排联结的几种方法进行了分析比较。     

钢结构制作中防止焊接变形的实践

就一些结构制作工程施工中存在的焊接变形问题进行了分析与探讨，阐明了防止焊接变形的措施及其在结构制作中的重要性。     

软硬FeSi75%交叉冶炼法

分析了小电炉冶炼硬７５硅铁效率低下的原因，提出了具体改进措施和所取得成果。