成都市某基坑变形监测方案设计分析

概述了基坑监测中需要注意的基本问题和一般性原则,并结合成都市青羊区瑞南街东侧一基坑变形观测项目,分析了该项目运行过程中涉及到的一些典型问题,包括项目概况、基准点布设、观测周期等内容,并结合实际情况得出相应结论。     

黏滞阻尼器耗能减振工程应用设计方法研究

本中文阐述了黏滞阻尼器的构造、力学模型以及其耗能减振的基本原理,并基于国际结构振动控制公共平台Benchmark模型,采用ANSYS和SAP2000有限元软件对其进行无控和有控地震反应分析,研究了黏滞阻尼器自身参数、设置形式、速度指、阻尼系数、位置和数量等因素对其控制效果的影响规律.结合国内外规范,给出LVD安装形式、...     

Sector-based approach to the post-2012 climate change policy architecture

A sectoral approach to GHG emissions reductions in developing countries is proposed as a key component of the post-2012 climate change mitigation framework. In this approach, the ten highest-emitting developing countries in the electricity and other major industrial sectors pledge to meet voluntary, ‘no-lose’ GHG emissions targets in these sectors. No penalties are incurred for failing to meet a target, but emissions reductions achieved beyond the target level earn emissions reduction credits (ERCs) that can be sold to industrialized nations. Participating developing countries establish initial ‘no-lose’ emissions targets, based upon their national circumstances, from sector-specific energyintensity benchmarks that have been developed by independent experts. Industrialized nations then offer incentives for the developing countries to adopt more stringent emissions targets through a ‘Technology Finance and Assistance Package’, which helps to overcome financial and other barriers to technology transfer and deployment. These sectorspecific energy-intensity benchmarks could also serve as a means for establishing national economy-wide targets in developed countries in the post-2012 regime. Preliminary modelling of a hybrid scenario, in which Annex I countries adopt economy-wide absolute GHG emissions targets and high-emitting developing countries adopt ‘no-lose’ sectoral targets, indicates that such an approach significantly improves the likelihood that atmospheric concentrations of CO₂ can be stabilized at 450 ppmv by the end of the century.     

露天矿山边坡沉降监测方法研究

国内外大型深凹露天矿山边坡监测的发展十分迅速,基于眼前山铁矿边坡的工程地质条件、边坡形态、稳定状态,进行边坡沉降监测非常必要,在此情况下,结合徕卡TM30全站仪,进行眼前山铁矿边坡沉降监测方法的研究与实现,基准网的建立以及通过误差来源分析进行监测点的位置选择与设计,提出一个高效的监测方法。     

An improved shuffled frog leaping algorithm and its application in the optimization of cascade reservoir operation

ABSTRACT

A new improved shuffled frog leaping algorithm (SFLA), the chaos catfish effect SFLA (CCESFLA), is proposed by coupling a local “refine search” mechanism and a “global incentive adjustment” mechanism. Chaotic technology is introduced in the local “refine search” mechanism to improve local search ability, by implementing more refined local search around the optimal individuals. The catfish effect mechanism is adopted in the “global incentive adjustment” mechanism to improve global convergence, by motivating the frogs to “jump out” of the local steady state. The operation optimization by the CCESFLA is carried out taking the Li Xianjiang cascade reservoirs in China as an example. Compared with SFLA, particle swarm optimization, immune SFLA and cloud SFLA, the average annual power generation using the CCESFLA can be increased by 6.7, 7.5, 3.0 and 0.8%, respectively. The convergence process of the CCESFLA is more stable, and its execution time is the least of the three improved SFLAs.     

ITRF2005参考框架的综合探讨

对近年来精度高、应用较多的国际地球参考架ITRF2005做了简单概述,指出了ITRF2000与ITRF2005之间在解的生成、基准的定义和实现等方面的不同。此外,ITRF2005除了包含作为参考框架体现的站点坐标和速率之外,还包含一起参与联合处理的地球定向参数：极移、极移速率、日长、UT1的时间序列[1]。重点阐明ITRF2005的实现的基本情况及其相对于ITRF2000所作改进的理由和合理性。     

大桥变形监测网基准点稳定性分析方法研究

本文论述了大桥变形监测基准网稳定性分析的几种经典方法和可能存在的不足,提出自由设站法在大桥变形监测中的应用优势和特点。同时运用独创的VT检验法进行基准点稳定性判断,可以大大提高基准点稳定性判断的正确率,使基准点保持相对稳定,已达到保证和改善监测成果质量的目的。     

基坑施工沉降观测基准稳定性分析及应用

观测基坑及其周围建筑物在基坑施工阶段的沉降，对保证施工安全具有重要意义。基坑施工沉降观测一般采用固定基准，因此要求有稳定的水准基点，工作基点稳定与否也直接关系到联测和有关沉降计算。研究了水准基点和工作基点稳定性的分析方法，结合基坑施工沉降观测实际，利用基准网观测数据进行水准基点稳定性分析，利用水准基点与工作基点的联测数据进行工作基点稳定性分析，保证了基坑及其周围建筑物沉降的真实性。     

公路GPS测量非参数基准计算方法的探讨

本文根据公路勘测需要，应用大地测量学的一些理论，建立公路GPS测量的非参数基准，探讨了解决长度投影变形的计算方法。     

Reliability‐based robust control for uncertain dynamical systems using feedback of incomplete noisy response measurements

A reliability‐based output feedback control methodology is presented for controlling the dynamic response of systems that are represented by linear state‐space models. The design criterion is based on a robust failure probability for the system. This criterion provides robustness for the controlled system by considering a probability distribution over a set of possible system models with a stochastic model of the excitation so that robust performance is expected. The control command signal can be calculated using incomplete response measurements at previous time steps without requiring state estimation. Examples of robust structural control using an active mass driver on a shear building model and on a benchmark structure are presented to illustrate the proposed method. Copyright © 2003 John Wiley & Sons, Ltd.