Symmetry analysis by computer

Approximate locations of axes of symmetry of a 2-dimensional region are detected on the basis of its border. The border, described in terms of certain directional codes, is treated as a regular polygon in a hierarchical manner where a lower level means a greater number of sides. At each level of the hierarchy, the best axis of symmetry is found which for a lower level gives a more accurate position of the unknown axis of symmetry than for a higher level. Along with an axis of symmetry, a certain error is found on the basis of which the degree of symmetry of a 2-dimensional region is defined. Programs are written in FORTRAN IV and are implemented on an EC-1033 computer.     

专业的建设与发展论水库移民规划设计

水库移民规划设计是一种新兴的专业。水库移民规划设计的首要任务就是要促进工程建设的决策科学化。水库移民规划设计提供成果的可靠性，对工程决策是否科学起着重要作用。水 库移民规划设计，在空产上要规定移民资金的合理投向，在时间上要安排好移民资金的合理汉程。在市场经济条件下，要获得更多的设计任务，这就要拥有真正的技术优势先进的管理手段和较低的设计成本。设计单位必须主动地参与设计市场的竞争，强化竞争意识。加强     

高含沙明渠紊流光滑区f－Re关系与平均流速公式

本文根据水槽试验结果，从紊动与絮网结构相互影响的角度分析了光滑区内阻力系数ｆ与有效雷诺数Ｒｅ关系散乱的原因；通过分析ｆ与断面平均流速Ｖ的关系，建立了高含沙明渠紊流光滑区平均流速公式，井作初步分析．     

寒冷地区混凝土面板堆石坝面板的设计

混凝土面板堆石坝的面板受荷载作用时，发生弹性变形，产生内力，可将其视为弹性地基梁结构，进行结构分析．设计中应根据面板的受力特征进行分缝布置，选择合理的板厚，采用合理的结构配筋．对处于寒冷地区的混凝土面板堆石坝，要考虑冰冻对面板的作用和影响，重点考虑面板的抗冻问题．     

寒冷地区混凝土面板堆石坝垫层的设计

对于寒冷地区的钢筋混凝土面板堆石坝，应根据水库运行特征分区考虑垫层的设计．冬季水位以上区域重点考虑防冻涨问题；水位以下区域考虑垫层的基础及防渗两种功能协调共同发挥作用的问题．对于寒冷地区，垫层宽度的选择是造价、可靠性和施工进度要求的综合考虑结果．施工方法也是设计寒冷地区面板坝时必须考虑的主要因素之一．     

刘家峡水电站坝前与洮河库区淤积发展趋势的分析计算

刘家峡水库自1968年舌水到1991年底，库内共淤积泥沙12亿m3，占总库容的21％，威胁着电站的安全运行．本交通过实测资料分析并结合数学模型计算，对刘家峡水库的淤积发展趋势进行了分析．分析结呆表明：水库中泥沙的冲淤，取决于当年的进出库水沙条件、高水位高低及前期淤积状态等，其中洗河入库流量的大小时排河库区的冲淤起决定性作用．本文还就根本解决刘家峡水库泥沙问题的措施，提出了建议．     

扇聚焦等时性回旋加速器性能的改进和提高

安装了ＥＣＲ离子源及其外注入系统后，增加了离子种类、提高了束流强度。扇聚焦等时性回旋加速器（ＳＦＣ）主要工作点分布于三次谐波加速区域，为了匹配外注入系统，仔细地研究了中心区，重新设计加工了Ｄ盒及假Ｄ。为了改进ＳＦＣ性能，提高运行效率，同时进行了其它改进工作。介绍了改进后的ＳＦＣ的调束工作。     

双基地雷达测高精度研究

本文研究利用双基地雷达系统的两维观测信息计算目标高度的原理及影响计算精度的因素，讨论了各种测高算式的误差及其实用区域的划分，提出了地球曲率影响的一种修正方法，给出了处理测高问题的步骤。     

Region-based Statistical Analysis of 2D PAGE Images

A new comprehensive procedure for statistical analysis of two-dimensional polyacrylamide gel electrophoresis (2D PAGE) images is proposed, including protein region quantification, normalization and statistical analysis. Protein regions are defined by the master watershed map that is obtained from the mean gel. By working with these protein regions, the approach bypasses the current bottleneck in the analysis of 2D PAGE images: it does not require spot matching. Background correction is implemented in each protein region by local segmentation. Two-dimensional locally weighted smoothing (LOESS) is proposed to remove any systematic bias after quantification of protein regions. Proteins are separated into mutually independent sets based on detected correlations, and a multivariate analysis is used on each set to detect the group effect. A strategy for multiple hypothesis testing based on this multivariate approach combined with the usual Benjamini-Hochberg FDR procedure is formulated and applied to the differential analysis of 2D PAGE images. Each step in the analytical protocol is demonstrated by using an actual dataset. The effectiveness of the proposed methodology is shown using simulated gels in comparison with the commercial software packages PDQuest and Dymension. We also introduce a new procedure for simulating gel images.     

Attainable regions of reactive distillation—Part III. Complex reaction scheme: Van de Vusse reaction

The main underlying principle behind the application of reactive distillation (RD) for selectivity enhancement is to facilitate the separation of selected components and favorably manipulate the composition profiles in the reactive zone to expedite the desired reaction. In this paper, a geometric approach of attainable region (AR), which is already developed for conventional reactor network, is extended further to include few representative RD configurations. We define new RD building blocks and the corresponding composition vectors that indicate a need of networking of RD units among themselves and with conventional reactors to enlarge the set of attainable compositions. A model reaction scheme of van de Vusse type ) is studied as an illustrative example and an algorithm is developed to obtain the attainable region for the given kinetics, feed composition and relative volatilities. In almost all the different cases, which are studied by varying the kinetics and volatility pattern, network consisting of RD units performs better than the conventional reactor network.