酵母单细胞蛋白絮凝分离的研究

本文提出了分离酵母单细胞蛋白的一种新方法——用絮凝沉降法分离酵母单细胞蛋白;研究了鞣酸+A对酵母细胞的絮凝作用。探讨鞣酸+A絮凝酵母细胞的机理;较为系统地研究了环境因素对鞣酸+A絮凝酵母细胞的影响;首次将质心映射优化法(CMO法)和响应面法(RSM法)结合起来,运用计算机优化了絮凝条件,并就鞣酸+A对酵母细胞的絮凝作用进行表征;通过对酵母细胞表面的X-射线能谱分析,证实金属离子Ca~(2+)、Cd~(2+)、Mn~(2+)和K~+参与了鞣酸+A对酵母细胞的絮凝作用。通过鞣酸+A絮凝酵母细胞的小试研究,可以认为采用絮凝沉降法分离酵母单细胞蛋白是可行的,且节能效果显著,具有较大的现实意义。     

纳米CMOS电路逻辑等效变换

针对纳米CMOS电路连通域结构约束,该文提出了基于逻辑复制方法的电路等效变换技术以降低电路映射复杂性。首先通过对电路中所有的门扇出值进行排序来选定基准高扇出值;然后对于高扇出门单元通过二次方程式计算变换前后复杂度,对复杂度降低的高扇出门单元执行逻辑复制并进行扇出分割。与传统插入反相器方法网表转换法比较,结果表明使用该文提出的方法电路不仅更快速地被映射到纳米混合电路单元上,而且具有更好的时延特性。     

天绘一号卫星高分辨、多光谱相机与三线阵正视相机夹角在轨标定方法研究

通过对天绘一号卫星摄影原理的分析,建立了在轨标定高分辨、多光谱相机与三线阵正视相机夹角的几何模型,并利用天绘卫星影像数据进行了相关试验。试验结果表明:该方法可行,精度较高,与可供参考的地面实验室定标结果较为接近,高分辨相机与三线阵正视相机夹角标定的两种结果相差1'左右,多光谱相机与三线阵正视相机夹角标定的两种结果相差5'左右。同时,计算分析了卫星定轨误差和地面控制点精度对夹角的影响。该方法模型简单,易于理解,解决了目前天绘一号卫星高分辨、多光谱相机与三线阵正视相机夹角仅有地面实验室标定结果,缺乏有效在轨标定方法的问题,对于影像的融合、纠正及高级产品的生产具有重要意义。     

城市测绘生产与档案信息综合管理平台的设计与实现

结合西安市勘察测绘院测绘生产与档案管理现状,基于B/S架构,采用MVC设计模式J、2EE框架、数据库、工作流等技术开发了运行在局域网内的院测绘生产与档案信息一体化综合管理平台。本文对该平台的总体架构、流程及功能设计、采用的关键技术及平台特点进行了详细阐述。本平台的应用大大减少了重复性劳动,提高了工作效率,改变了管理模式...     

基于Microstation V8实现制图效果与GIS数据要求的统一

针对Microstation V8平台二次开发,阐述了以＂骨架线＋构造数据＂表现地形图点线面等元素的设计思路和方法,辅以图形要素关系间的处理手段,有效解决了制图效果与GIS数据要求的冲突,实现了＂一套数据、两种用途＂。     

Comparison of Northern Ireland radon maps based on indoor radon measurements and geology with maps derived by predictive modelling of airborne radiometric and ground permeability data

Publicly available information about radon potential in Northern Ireland is currently based on indoor radon results averaged over 1-km grid squares, an approach that does not take into account the geological origin of the radon. This study describes a spatially more accurate estimate of the radon potential of Northern Ireland using an integrated radon potential mapping method based on indoor radon measurements and geology that was originally developed for mapping radon potential in England and Wales. A refinement of this method was also investigated using linear regression analysis of a selection of relevant airborne and soil geochemical parameters from the Tellus Project. The most significant independent variables were found to be eU, a parameter derived from airborne gamma spectrometry measurements of radon decay products in the top layer of soil and exposed bedrock, and the permeability of the ground. The radon potential map generated from the Tellus data agrees in many respects with the map based on indoor radon data and geology but there are several areas where radon potential predicted from the airborne radiometric and permeability data is substantially lower. This under-prediction could be caused by the radon concentration being lower in the top 30 cm of the soil than at greater depth, because of the loss of radon from the surface rocks and soils to air.     

Statistical analysis of solar measurements in Algeria using beta distributions

A method of smoothing solar data by beta probability distributions is implemented in this paper. In the first step, this method has been used to process daily sunshine duration data recorded at thirty-three meteorological stations in Algeria for eleven year periods or more. In the second step, it has been applied to hourly global solar irradiation flux measured in Algiers during the 1987/89 period. For each location and each month of the year, beta probability density functions fitting the monthly frequency distributions of the daily sunshine duration measurements are obtained. Both the parameters characterising the resulting beta distributions are then mapped, enabling us to build the frequency distributions of sunshine duration for every site in Algeria. In the case of solar radiation for Algiers, the recorded data have been processed following two different ways. The first one consists in sorting the hourly global solar irradiation data into eight typical classes of the daily clearness index. The second one is based on the repartition of these data per month. The results of the first classification show that for each class of daily clearness index, the hourly data under consideration are modelled by only one beta distribution. When using the second classification, linear combinations of two beta distributions are found to fit the monthly frequency distributions of the hourly solar radiation data.     

一类新的广、多值混合变分不等式

研究了一类新的多值混合变分不等式,建立了其解的一个存在性定理和建立了一个寻求其近似解的带有误差的算法,证明了近似解序列强收敛于其精确解,推广和统一了最近出现的一些结果     

浅谈矿山地形地质图的绘制

本文叙述了矿山地形地质图的绘制原则、方法和程序以及提高绘图质量的措施和途径,对矿山绘制有关生产图件有一定的指导作用.     

硬盘保护卡的软硬件设计

本文从软、硬件两方面阐述了目前流行的硬盘保护卡的设计原理,剖析了软件方面的关键技术,给出了最简单的硬件电路原理图。