北京大气气溶胶光学特性的综合遥感和分析

本文根据激光和光度计的综合探测资料,分析了1983年11月至1984年12月北京大气柱气溶胶光学厚度、谱分布、折射率以及粒子浓度的高度分布等气溶胶光学特性,研究这些参数在不同季节下的变化规律,着重研究春季的情形。     

沙尘暴的光学遥感及分析

本文根据激光雷达和光度计综合探测的结果，结合气象背景资料分析了1988年4月北京地区三次沙尘暴过程气溶胶物理光学特性及其远距离输送时的垂直结构。这三次尘暴主要来源于内蒙的沙漠和黄土地区，根据激光探测消光系数垂直分布资料，在4月11日，沙尘粒子有3个不同的输送带，其中两个输送带的高度处于 2000—3000 m和3000—6000 m，另一个输送带的下边界高度约为200 m，其高度结构密切依赖于风场的垂直结构。根据多波长太阳光度计和半球辐射计的观测结果，尘暴期间大气柱沙尘总光学厚度在0.3至15之间变化，峰值光学厚度比平时偏大约一个数量级，在0.65 μm波长，在4月11日测量的气溶胶一次散射反照率均值为0.85。     

BC4-1 Multi-Channels Instantaneous Signal Acquiring Apparatus

BC4-1 multi-channels instantaneous signal acquiring apparatus was developed by our institute. In this paper, the apparatus has been introduced with its functions, technical targets. Operating modes and so on. During the process of developing this apparatus, we referenced the similar apparatuses in home and abroad, and also considered the characteristics of field measurements of geotechnical engineering, and therefore this apparatus has distinctive advantages, such as small volume, light weight, flexible power supply, simple and direct operating, and so on. We wish this apparatus will be admitted by the wide engineers and technicians.     

保定市一亩泉漏斗区地下水水化学特征演变及驱动机制解析

本文在对比分析一亩泉漏斗区地下水开采前—开采中—压采全过程地下水水化学特征基础上,综合利用数理统计分析、离子比例分析、水文地球化学模拟技术,揭示了漏斗区地下水水化学特征演化规律,解析了水化学特征演变驱动机制。结果表明,研究区地下水水化学特征演化表现出阶段性,在开采初期至压采初期,水化学类型、TDS、总硬度保持稳定,水化学类型以HCO-3—Ca2+·Mg2+型为主;在漏斗恢复期地下水水化学类型种类增多,TDS和总硬度显著增大,表现出向盐化和硬化方向演化趋势;1960~2010年研究区地下水水化学成分主要受脱白云石化作用、阳离子交换作用控制,呈自然演化规律;2010年以后,在漏斗恢复背景下,包气带中水岩相互作用过程加剧,地下水水化学演变受溶滤作用和离子交换作用控制,人类活动对地下水水化学特征的影响逐渐显现。研究结果可为漏斗区地下水保护与修复提供科学依据。     

Greenhouse gas emissions from the usage of typical e-products by households: a case study of China

The number of electric and electronic products (e-products) owned by Chinese households has multiplied in the past decade. In this study, we analyz the GHG emissions from e-products in Chinese households in order to understand and determine how to mitigate their effects on climate change. The results show that the usage stage of e-products has become an important source of GHG emissions in China, with total GHG emissions of these household e-products reaching about 663 million tons CO₂ eq., accounting for about 8.85 % of all Chinese GHG emissions in 2012. The average GHG emission per household per year in China was 1538 kg CO₂ eq. in 2012, a little higher than that of Norwegian households (1200 kg CO₂ eq.). The electricity mix plays a very important role in GHG emissions, and the 78 % coal-fired power consumption accounted for 99.69 % of the total GHG emissions. Our research also supports the view that GHG emissions from household e-products increased with economic level. To reduce the GHG emissions of household e-products, the development of energy-saving e-products and changes to the electricity mix would be very effective measures.     

厚覆盖区找矿“循环渐近式勘查技术体系”与应用

覆盖区找矿难度不仅与覆盖层厚度有关,还与覆盖层物性、水文地质条件以及矿体特征关系密切。覆盖区找矿突破是一个系统过程,需要经历选区—圈靶—定位—验证评价4个阶段,存在勘查选区、地质信息探测和多学科有效融合难题。前人较少研究覆盖区找矿突破过程与勘查技术体系,笔者等基于"现有技术+结合实际创新"思路,总结提出了厚覆盖区找矿"循环渐近式勘查技术体系",在实际应用中,能够提高找矿成功率,入选自然资源部《矿产资源节约和综合利用先进适用技术目录(2019年版)》。     

Susceptibility assessment for rainfall-induced landslides using a revised logistic regression method

Natural Hazards - Landslide susceptibility is the likelihood of a landslide occurring in an area. The logistic regression (LR) method is one of the most popular methods for landslide susceptibility...     

Intelligent assistant driving method for tunnel boring machine based on big data

Acta Geotechnica - During tunnel construction with tunnel boring machine (TBM), the TBM drivers determine the driving parameters depending only on their own experiences. Inappropriate TBM driving...     

BC4-1型便携式多通道瞬态信号采集仪

本文对我所研制的BC4-1型便携式多通道瞬态信号采集仪的功能,各项技术指标,操作方法及现场实用情况等作了介绍。该仪器在研制过程中,参考了国内外先进的同类仪器,并考虑了岩土工程野外作业的特点。希望能以它的体积小,重量轻,供电方式灵活,操作直观简便等特点,赢得广大工程技术人员的认可。     

基于Geodatabase模型建立测绘数据库的方法研究

对Geodatabase模型的内部结构及各元素的功能进行了深入的分析研究,总结了基于Geodatabase模型建立空间数据库的优势,提出了基于Geodatabase模型建立测绘数据库的步骤、方法及应特别注意的问题。