甘孜地热发电热力计算及优化

A geothermal well in Ganzi was chosen for the study. To provide a reference for the design and construc?tion of a geothermal plant, power generation techniques were selected and the thermodynamic process was calculat?ed based on cold and heat source dat

Study of the Photovoltaic Properties of Tin Oxide/Porous Silicon/Silicon

测量了二氧化锡（SnO2）/多孔硅（PS）/硅（SI）的光电压谱，分析表明：在SnO2/PS/SI材料中存在着两个异质结；当样品吸附还原性气体时，其光电压明显下降。当样品在1%液化石油气的氛围时（相对于空气），光电压减少了16.4%-27.5%；在1%CO氛围时，减少了8.1%-19.4%；在1%H2氛围时，减少了12.1%-14.9%，因此SnO2/PS/SI可作为一种新的敏感元件。文中还对测量结果进行了讨论分析。The photovoltage spectra of Tin Oxide/Porous Silicon/Silicon(SnO2/PS/Si)have been studied.It is shown that there exist two heterojunctions inSnO2/PS/Si structure.The photovoltage decreases evidently when the sample absorbes reducing gas.The photovoltage decreases by 16.4-27.5 percent when theabsorbed gas contains 1 percent liquiFied petroleum, by 8.1 19.4 percent when thesample absorbes gas with 1 percent CO,and by 12.1-14.9 percent when the sample absorbes gas with 1 percent H,.The experimental results indicate that SnO2/PS/Si is a good material For gas sensor.The mechamism For the gas absorption ofSnO2/PS/Si is discussed.国家和福建省自然科学基

Variation of photovoltage spectra for SnO_2/PS/Si during prior-and post-adsorption

制备了二氧化锡/ 多孔硅/ 硅（SnO2/PS/SI） 异质结构样品，在不同温度下，分别测量样品吸附氢气、液化石油气前后的光生电压谱。结合X 光电子能谱（XPS） 测量结果，分析了光生电压谱变化的机理SnO 2/PS/Si heterojunction structure samples are fabricated.The photovoltage spectra of the samples during prior-and post-adsorption of H 2 or liquified petroleum at different temperature are measured.In combination with the results of XPS measurement,analysis on the variation mechanism of the photovoltage spectra is made.福建省自然科学基

通用医学图像处理系统的设计和实现

广大医疗机构对低成本、功能更全面的医学图像处理工作站和医学影像的存储和传输系统（即PACS系统,PictureArchiving&CommunicationSystem）的需求越来越迫切.PACS系统是放射学、影像医学、数字化图像技术、计算机技术及通信技术的结合,它将医学图像资料转化为计算机数字形式,通过高速计算设备及通讯网络,完成对图像信息的采集、存储、管理、处理及传输等功能,使得图像资料得以有效管理和充分利用.由于医学图像处理系统涉及众多图像处理、图形操作以及三维可视化算法,另外需要对复杂的DICOM3协议进行支持,因此它是PACS系统中的核心.该论文主要论述了通用医学图像处理系统的设计和具体实现,分析了系统的需求,制定了系统的设计和实现原则.针对目前一些常见的医学图像处理工作站和PACS系统的现状,我们对它们的共性进行了归类和分析,采用面向对象的设计技术,设计了一个灵活的、易于扩充的医学图像处理系统.以我们设计和开发的医学图像处理系统为基础,可以很容易地设计和开发功能更强大的医学图像处理工作站、构造医疗机构的PACS系统等.在论文中,我们对DICOM3标准的定义及其实现作了较详细的论述.在此同时,基于对VTK（TheVisualizationToolkits）类库的研究和分析,我们实现了医学图像处理系统的图形、图像处理功能和常用的一些可视化算法.With the vigorous development of computer technology, it is possible now to process images and operate on the models of images by Personal Computers. Many years ago, the work was able to be done only by the high-level graphics and image processing workstations. At present, large number of hospitals and medical organizations are in great demand to the low cost systems for medical image processing as well as for medical image storage and communication (or briefly PACS system, for Picture Archiving and Communication System). Among those, the medical image processing system is essential for the image processing, graphics manipulation, 3-D data visualization, and the support for the complicated DIC0M3 protocol related. In this thesis, we present a design and implementation of a common medical image processing system. We first analyze the requirement and establish the principles for the system design and implementation. With a functional introduction to the present medical image processing workstations or PACS systems, we made an analysis and classification to the common functions. Then a portable medical image processing system is designed and implemented based on the principle of object-oriented design. The functions of our system are extensible, and therefore, it is feasible to develop more powerful medical image processing workstations, or construct PACS systems based on the functions established in our system. In the thesis, we also give the definition and describe the implementation of DIC0M3 protocol in detail. Based on the study and analysis to VTK (the Visualization ToolKits), we implemented the graphical and image processing, as well as the common visualization functions in the image processing system

Construction and application of digital seismic network in Wenchuan earthquake fault

为了提高对"5.12"大地震灾害监视和预警的能力,了解地震孕育、发生及发展,研究汶川地震发震机理、地震复发周期和余震的迁移规律,"龙门山断裂带地震台网"建设,在震后迅速展开。该台网于2008-06-02开始正式传输地震数据,为灾后重建选址、地震科学钻探选址提供了可靠数据,同时也为研究龙门山断裂带余震分布情况、余震的迁移方向以及判断断层活动状况提供了科学依据。本文从台网选址、台网设计与建设、台网运行与管理、监测效能等方面介绍了台网的建设与应用

A discussion of methods of investigation and check of groundwater withdrawal

地下水开采量数据的准确与否直接关系到地下水资源评价的精度,进而影响到水资源利用规划。作者在长期调查工作的基础上,总结出地下水开采量调查尤其是农村地下水开采量的调查和校核方法,与同行探讨。The veracity of quantity of groundwater exploitation has a close relation to the precision of groundwater resource evaluation, and hence, it has an impact on groundwater resource planning. On the basis of long-term investigations of groundwater resources, the authors summarize methods of investigation and check of groundwater exploitation, particularly in rural areas. They are put forward in this paper in order to discuss with our colleagues.国土资源部地质调查项目(1212010331301

关于量化和A/D-D/A的讨论

数字、量化、量化效应、模拟、模拟量、A/D转换、D/A转换是计算机控制工程和控制理论上的常见概念。静心推敲,发现有不少流行性的误解。例如:不是“量化”而是截尾或四舍五入,不是“数字量”而是bit量,不是“模拟量”而是物理量等

一种基于Pade逼近对短时序列频率和品质因数的估计方法

该文提出了一种基于Pade逼近的谱估计方法。由于Pade逼近能够利用有限项很好地逼近对无限项的求和，文中算法适用于短时序列情况。经过实验仿真并与FFT方法和小波变换谱估计方法进行比较表明，该文算法具有较高的频率分辨率和估计精度，并具有较好的品质因数

Study of Energy Gap Parameter For Porous Silicon

测量了不同电腐蚀条件下制备的多孔硅/硅光伏谱，推导了带隙参数的计算公式.表面光伏谱测量计算值与光致发光的实验结果基本一致.The photovoltaic spectra of porcous silicon/silicon Fabricated by diFFerent electrochemical etching conditions are measured.The calculated Formulae of energy gap are drived.The energy gaps are calculated by surFace photovltaic spectra.The results basically agree with that measured by photoluminescence.国家与福建省自然科学基

高阶系统的简化问题

实际的系统多数是高阶系统,在建立系统的数学模型之后,简化高阶系统是研究系统性能的一项基本方法。讨论了零极点相消问题、主导零极点问题和系统类型问题,并且谈了作者自己的见解