大伙房水库输水工程隧洞结构应力仿真分析

应用有限元法对辽宁省大伙房水库输水工程主体隧洞结构进行了仿真分析,从而得到隧洞结构的应力分布规律,研究确定薄弱部位并采取相应的稳定措施,以便保证隧洞施工的安全与经济。     

Efficient and accurate waveguide mode computation using BI‐RME and Lanczos methods

In this paper, a special purpose algorithm for solving large eigenvalue problems based on the Lanczos method is successfully applied to an engineering problem: the electromagnetic analysis and design of passive waveguide devices. For dealing with such complex problems, the boundary integral‐resonant mode expansion (BI‐RME) technique has been recently proposed. This technique solves integral equations (IEs) through the well‐known method of moments (MoM), thus leading to structured eigenvalue problems. These problems frequently become very large when solving complex arbitrary geometries with high accuracy. In such cases, the eigenvalue problem cannot be efficiently solved with standard methods by means of personal computers, essentially due to CPU time and memory allocation requirements. In this paper, we propose an alternative technique, based on the Lanczos method, for the fast and accurate solution of large BI‐RME generalized eigenvalue problems. The novel theoretical aspects of this approach, as well as the impacton the original BI‐RME formulation, are described. Comparative benchmarks are also successfully presented for the full‐wave analysis and design of real passive microwave devices. Copyright © 2005 John Wiley Sons, Ltd.     

用于大位移情形的杆系结构虚功原理

通过典型示例揭示了传统杆系结构虚功原理在“微小位移”假定下,忽略挠度的一阶导数,用二阶导数代替曲率,造成的近似计算的假象,以及引起的概念上的混乱. 论证了虚功原理实质上是一组精确的数学恒等式,只是通过定义“力”和“位移”使其中每一项都赋予了虚功的物理意义,并不存在近似的问题. 提出了用截面转角的正切值定义截面的转动位移,并将虚功中力和位移的关系描述为力不随位移拖动的模式. 由此澄清了传统虚功原理可能引起的“近似计算,只适用于小位移”的假象,使虚功原理可以抛弃小位移假定,精确地适用于大位移情形.     

岩性圈闭储层描述技术及应用

本文以高分辨率地震资料为基础，应用测井、钻井等资料，从沉积微相分析入手，建立了以河道砂体、河口坝砂体为主的地质及地震响应模型，并根据地震反射波组特征、地震反演的阻抗值及其他地震属性参数，确定了研究区的砂体变化及其分布规律，总结出一套针对薄互层特点的岩性圈闭识别技术。本文方法在大庆长垣以西古龙和他拉哈西地区的实际应用中取得了明显的效果。     

未来地震检波器理论分析

本文通过对各类地震检波器工作原理的阐述，指出了适合高分辨率地震勘探的未来地震检波器可能采用的方法。分析检波器特性，阐明新型地震检波器可能实现的途径。     

Frames of Reference in Mobile Augmented Reality Displays.

In 3 experiments, the authors investigated spatial updating in augmented reality environments. Participants learned locations of virtual objects on the physical floor. They were turned to appropriate facing directions while blindfolded before making pointing judgments (e.g., "Imagine you are facing X. Point to Y"). Experiments manipulated the angular difference between the learning heading and the imagined heading and between the actual heading and the imagined heading. The effect of actual-imagined on pointing latency was observed for naive users but not for users with brief training or instructions concerning the fact that objects can move with body movements. The results indicated that naive users used an environment-stabilized reference frame to access information arrays, but with experience and instruction the nature of the representation changed from an environment stabilized to a body stabilized reference frame. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

自焙炭块在大型高炉上应用十年概况

自焙炭块陶瓷砌体复合炉缸技术在大型高炉上的应用已有10年，总的来说是成功的，但由于自焙炭块自身的特性，应用中也暴露出了一些问题。通过对国内大型高炉应用自焙炭块陶瓷砌体复合炉缸技术的全面调查，分析了该技术的应用前景，提出了改进措施。     

一种基于模式搜索的大尺寸测量移站坐标转换方法

针对空间大尺寸测量的移站坐标转换，提出了最小二乘坐标转换数学模型和基于模式搜索的参数求解方法，实验证明该方法具有理论正确性和实际可行性。     

催化裂化大油气管线阻焦剂的研究与开发

介绍了阻焦剂的阻聚分散机理，测定了不同组分的阻焦剂对不同性质原料的阻焦效果，并考察了不同加入浓度对阻焦率以及催化裂化产品分布的影响。试验结果表明：加入50—100μg/g的阻焦剂，可使催化裂化大油气管线阻焦率达到53．7％—63．8％，同时对产品分布及产品性质无不良影响，具有技术经济可行性。     

岩性圈闭预测方法及应用

随着油田勘探技术的不断进步和勘探目标的日益深化，地质目标从寻找大构造、发展到寻找微幅度构造和非构造的隐蔽油气藏。以往的研究结果表明，岩性预测方法由于受到地震资料分辨率及技术条件等因素的限制，其研究方法及对成果的认识都有其局限性，从而使预测的合理性和精度都不高，因此，本文以高分辨率地震资料为基础，应用测井、钻井及地震等资料，从沉积微相分析入手，建立了不同砂体类型的地质及地震正演模型，并根据地震反射波组特征、地震反演的阻抗值及其它地震属性参数，综合确定出研究区域的砂体变化及其分布规律。总结出一套针对薄互层特点的岩性圈闭识别技术，并在大庆长垣以西古龙和英台—大安地区的实际应用中取得了明显的效果。