土质边坡动力稳定可靠度计算方法研究

考虑爆破地震的时程效应,采用拟静力化的惯性力法,利用改进了的条分法来计算主动土压力,提出了土质边坡在爆破过程中的动力稳定性系数的计算方法,再用改进的JC法求出土坡最小稳定性系数和最小可靠度指标。实践证明,本方法是一种准确、实用的土坡稳定性计算方法。     

防震减灾网页设计要点及其日常维护——以山东省防震减灾信息网站为例

以山东省防震减灾信息网站为例 ,介绍了网页设计要点及日常维护的经验和体会 ,进而提出了网页进一步发展的新思路     

RAINGAGE NETWORK DESIGN USING NEXRAD PRECIPITATION ESTIMATES1

ABSTRACT: A general framework is proposed for using precipitation estimates from NEXRAD weather radars in raingage network design. NEXRAD precipitation products are used to represent space time rainfall fields, which can be sampled by hypothetical raingage networks. A stochastic model is used to simulate gage observations based on the areal average precipitation for radar grid cells. The stochastic model accounts for subgrid variability of precipitation within the cell and gage measurement errors. The approach is ideally suited to raingage network design in regions with strong climatic variations in rainfall where conventional methods are sometimes lacking. A case study example involving the estimation of areal average precipitation for catchments in the Catskill Mountains illustrates the approach. The case study shows how the simulation approach can be used to quantify the effects of gage density, basin size, spatial variation of precipitation, and gage measurement error, on network estimates of areal average precipitation. Although the quality of NEXRAD precipitation products imposes limitations on their use in network design, weather radars can provide valuable information for empirical assessment of rain‐gage network estimation errors. Still, the biggest challenge in quantifying estimation errors is understanding subgrid spatial variability. The results from the case study show that the spatial correlation of precipitation at subgrid scales (4 km and less) is difficult to quantify, especially for short sampling durations. Network estimation errors for hourly precipitation are extremely sensitive to the uncertainty in subgrid spatial variability, although for storm total accumulation, they are much less sensitive.     

预应力混凝土结构设计可靠度刍议

预应力混凝土结构是我国土木、水利和交通工程中应用最广泛和最具潜力的一种结构。笔者就新公布的《混凝土结构设计规范》GB5 0 0 10— 2 0 0 2与原规范GBJ10— 1989关于预应力混凝土结构设计可靠度内容所作的重大调整以及部分更新进行了探讨。对新规范GB5 0 0 10— 2 0 0 2的学习、理解和贯彻执行有一定指导作用。     

铁路道口安全与框构桥设计软件实现

铁路平交道口是铁路运输中常发生列车和汽车事故的地方 ,在列车经过平交道口时 ,汽车和行人等都必须停在道口两侧 ,严重地影响了交通安全 ,甚至有火车与熄灭在道口的汽车相撞 ,造成火车脱轨的重大事故。因此 ,平交道口改为立体交叉已势在必行。笔者提出了将平交道口改建为框构桥的设计方法 ,并用面向对象的程序设计方法实现了框构桥的自动设计、分析、计算及绘图等过程 ,将极大提高框构桥设计的工作效率 ,加快平改立的速度 ,尽快消除安全隐患     

驾驶工效综合评定座舱实验台的研制

为了在实验室内 ,能定性 /定量的研究飞机驾驶员工作时的复杂、实时操作感觉 ,开发了一台驾驶工效综合评定座舱实验台。该实验台主要由硬件 (包括座舱外壳、驾驶杆、座椅以及两台液晶显示器 )、软件两部分 (座舱视景系统、座舱仪表显示系统、飞机动力学系统、飞机控制系统、座舱网络通讯系统 )组成 ,通过使用眼动仪、触摸屏等设备来记录驾驶员的眼动及手动数据。该实验台可通过数据处理计算机实现人机界面的作业运动和进行工效综合评定。工效评定实验台的研制 ,可以提高座舱人机交互工效设计的可信度 ,是飞机驾驶舱面板优化设计的基础和依据 ,是研究保障安全飞行和提高作战能力以及效率等重大技术性能的重要手段。     

渤海PL19-3油田设计地震动参数研究

渤海PL19-3油田按美国有关规范进行抗震设计,其抗震设防标准和地震动参数与我国有关技术规范相比均存在一定的差别。本文根据渤海及邻区的地震构造、地震活动环境的研究结果,以及工程场地的钻探资料、土动力参数测试结果,参照美国有关技术规范的方法,确定了PL19-3油田的设计地震动参数。研究成果不但能满足该工程的抗震设计需要,也可供渤海海域其他工程参考,尤其是所得到的场地土动力学参数具有其特殊性和代表性。本工作将促进海洋工程的抗震技术规范和设防标准的研究,同时,也为未来开展海域地震区划工作积累了基础资料和工作方法。     

青岛"城市数字化工程"研究

随着数字时代的到来，传统的城市规划、建设、管理与服务方式暴露出许多问题。在分析青岛城市系统信息化建设的基础上，提出了青岛“城市数字化工程”建设的目标、总体逻辑结构、数据库设计及其应用系统的开发研究等一系列问题，以期为青岛“城市数字化工程”建设提供决策支持。     

浅析存款业务创新

从技术角度来探讨银行的存款业务创新，提出商业银行应该考虑经济发展情况、金融文化背景等因素，以满足客户的需求为目的来设计、组织存款要素，并在市场细分的基础上，提供差别化存款产品，按市场规律进行定价。     

Experimental design of the Svalbard shoreline field trials

Experimental oil spills on three mixed-sediment beaches in Svalbard, Norway, were designed to evaluate the effectiveness of in situ shoreline cleaning treatments to accelerate natural recovery. These were: sediment relocation (surf washing), mixing (tilling), bioremediation (fertilizer application), and bioremediation combined with mixing. Additionally, natural attenuation was studied as a treatment option. An intermediate fuel oil was applied to the sediment surface in the upper intertidal zone at three experimental sites, each of which had different sediment characteristics and wave-energy exposure. Over a 400-day period, the experiments quantified oil removal, documented changes in the physical character of the beach as well as oil fate and behaviour, assessed toxicity effects associated with treatment, and validated oil-mineral aggregate formation as a result of the selected treatment techniques. The three sites were chosen based on significant differences, and each treatment was quantitatively compared only with other treatments at that site.This paper describes the physical location and the experimental design of the field trials. Some of the key issues that were addressed in the design included: the methodology for application of oil, the application of treatment techniques, the realistic simulation of real-world conditions, and the sampling protocols to overcome sediment and oiling heterogeneity typical of mixed-sediment beaches in order to allow quantitative comparisons of the treatments.