中子辐照对隧道二极管性能的影响

本文介绍了中子辐照环境中,隧道二极管性能的退化,即谷电流增加,峰谷比下降、摆幅电压减少。用二次隧道效应理论解释了这种退化过程。     

居民峰谷分时电价研究

研究了推广居民峰谷电价与负荷削峰填谷的关系。介绍了国内外居民峰谷电价情况,从对居民的消费心理及生活用电情况分析,提出了电网峰谷电价的设计方案。通过对不同电价设计方案的分析,推荐了居民峰谷分时电价的方案。     

堆石料填筑标准对狭窄河谷面板堆石坝应力变形的影响研究

为研究堆石料填筑标准对于狭窄河谷高面板堆石坝应力变形的影响规律,本文运用三维有限元法,以某高面板堆石坝工程为例,进行了堆石料不同填筑标准下的大坝应力变形特性的对比研究。结果表明:随着堆石料填筑标准的提高,坝体和面板的应力变形均基本呈现单调递减的变化规律,且堆石料填筑标准对坝体和面板应力变形的影响存在一个明显的"拐点",如本文工程实例的主堆石料干密度影响"拐点"为2.16 g/cm3。因此,通过提高堆石料填筑标准,可以明显改善狭窄河谷中高面板堆石坝的应力变形状况,但应注意堆石料填筑标准对大坝应力变形的影响存在"拐点"这一特性。     

洪家渡混凝土面板堆石坝设计

洪家渡水电站拦河坝为混凝土面板堆石坝，最大坝高179．5m，为目前国内外高面板堆石坝之一。坝址处于高山峡谷岩溶地区，河谷狭窄，岸坡陡峻，在洪家渡面板堆石坝设计过程中，围绕减少岸坡开挖和填筑工程量，减小坝体不均匀沉降，确保止水效果等关键技术问题进行了深入研究，就堆石坝的布置、坝体分区、趾板布置、周边缘结构、坝顶结构等进行优化设计，取得了显著的经济效益和社会效益。     

非岩溶区峡谷水库成库地质条件评价的量化指标初步探讨

通过对水库成库地质条件的分析，建立影响水库成库地质条件的量化指标，在此基础上，提出了评价水库成库地质条件的量化指标体系，力求探讨水库成库地质条件数量化评价途径和方法，并建立相应的水库成库地质条件判别规则和标准。     

Occurence of Culturable Vibrio cholerae from Lake Victoria,and Rift Valley Lakes Albert and George,Uganda

Vibrio cholerae, a bacterium that causes cholera, poses a human health risk when consumed via untreated or contaminated water. Monthly investigations into the presence of V. cholerae from Lakes Albert, George and Victoria were conducted, with the goal being to examine the relationship between the occurrences of V. cholerae with various water quality parameters at fish landing sites in major water bodies in Uganda. The pH, temperature and electrical conductivity were measured at three fishing sites in each of the three study lakes; namely Gabba in Lake Victoria, Butiaba in Lake Albert and Kayanzi in Lake George. The pH values varied from 7.76 to 9.36 at Butiaba, 8.68 to 9.85 at Kayanzi and 6.6 to 9.88 at Ggaba. The temperature ranged from 17.9 to 32.3 °C at Butiaba, 22.5 to 29 °C at Kayanzi and 18.2 to 30.5 °C at Ggaba. The electrical conductivity ranged from 129.2 to 984 μS cm^?1 at Butiaba, 658 to 1090 μS cm^?1 at Kayanzi and 119 to 218 μS cm^?1 at Ggaba, for Lakes Albert, George and Victoria, respectively. Enrichment techniques were used to detect culturable V. cholerae on TCBS culture media. Seventy‐five (75%) of the samples (n = 90) were positive for V. cholera. The occurrence of V. cholerae was positively associated with water quality parameters over the 10‐month period of study. Vibrio cholerae was more frequently detected during the dry season (warmer) than during the wet season. These study results suggest the investigated study lakes are natural reservoirs for V. cholerae.     

四川建设抽水蓄能电站的必要性浅析

本文以四川电网近几年运行实际统计，分析阐明随着国民经济和社会发展，人民生活的不断改善，必须带来电网负荷率逐渐降低，峰谷差越来越大的客观规律性，只有建设机动灵活的抽水蓄能电站，才能充分利用水能资源，提高电网供电可靠性，从而获得电网和社会巨大的效益。     

牵引流砂质载荷沿陡坡滑动形成砂质碎屑流沉积模拟研究

斜坡沉积体系中的砂质碎屑流沉积是斜坡带的主要储集体类型,也是现阶段储层研究的热点之一。随着大陆勘探程度的不断提高,由陆向海过渡的斜坡带是今后勘探领导的新战场。基于此,本研究具有前瞻价值和实际指导意义。作者利用沉积模拟实验技术,考虑不同的斜坡长度、坡度和湖水深度,详细分析了点物源碎屑流形成深切谷和发育碎屑流的临界坡度、高差,深入探讨了斜坡带上砂质碎屑流形成及发育的控制因素,细致刻划了点物源碎屑流沿坡折带搬运方式、演化特征及其沉积作用规律。     

A TPDP-MPM-based approach to understanding the evolution mechanism of landslide-induced disaster chain

With complex topographic and hydrological characteristics, the landslide-induced surge disaster chain readily develops in mountainous and gorge areas, posing a huge challenge for infrastructure construction. This landslide-induced surge disaster chain involves a complex fluid-solid coupling between the landslide mass and a water body and exhibits complex energy conversion and dissipation characteristics, which is challenging to deal with using traditional finite element analysis. In this study, the energy evolution characteristics in the whole process of the disaster chain were first investigated, and the momentum-conservation equations for different stages were established. Then, the two-phase double-point material point method (TPDP-MPM) was used to model the landslide-induced surge disaster chain, and an experiment involving block-induced surge was modeled and simulated to validate this method. Finally, three generalized models were established for the landslide-induced surge process in a U-shaped valley, including subaerial, partly submerged, and submarine scenarios. The interaction mechanism between the landslide mass and the water body in the disaster chain was revealed by defining the system energy conversion ratio and the mechanism of evolution of the disaster chain from the perspective of energy. The results help further evaluate the secondary disasters, given the submerged position of the landslide mass.     

基于Fluent的蓄热体传热过程的数值模拟

在能源紧张的环境下,蓄热式电锅炉利用低谷电加热蓄热体耐火砖材料将不能存储的电能转化为热能暂时贮存起来,通过二次换热转化为用户可以利用的能源。蓄热体工作过程分为加热、保温、放热、保温、再加热的循环过程。放热过程是蓄热体工作的主要阶段,放热量的大小和时间长短直接影响设备的工作状态。通过对蓄热体模型的简化,建立三维模型,采用ANSYS Workbench中的Fluent模块对蓄热体的放热过程做了数值模拟,得到了蓄热体放热过程出口温度的分布情况。得到的结果和某工厂的电锅炉实际工作温度和时间相吻合,通过对蓄热体材料、加热时间等一些参数的设置得到的模拟结果对实际生产具有一定的指导意义。