新疆沙漠细砂混凝土配合比及混凝土性能研究

本文通过密实配合比设计技术路线,研究了新疆沙漠细砂与破碎粗砂混合后混凝土的性能,并通过孔结构试验研究对比沙漠混合砂混凝土与破碎粗砂混凝土的孔隙率和孔隙特征。结果表明：沙漠砂与破碎粗砂按1.5：8.5比例混合后制作出的混合砂混凝土,和易性得到改善,且各等级混凝土的28d抗压强度比破碎粗砂混凝土强度提高3MPa左右;各等级沙漠混合砂混凝土的氯离子扩散系数均低于破碎粗砂混凝土,有效提高混凝土的抗氯离子侵蚀能力;压汞试验表明,掺沙漠砂后,混凝土的孔隙率由15.54%降至11.25%,且平均孔径降低,孔隙得到细化,使硬化浆体的密实度提高。     

荒漠草原恢复文献综述

草地是世界上分布最广的植被类型之一,是陆地生态系统的重要组成部分,在减缓全球变化中起着重要的作用。草地退化是我国天然草地面临的突出问题,已经威胁到社会和经济的正常发展。从自然因素和社会因素角度分析草地退化原因,起主导作用的是人类的活动和不合理的资源利用导致草地面积减少,覆盖度降低。本文结合近几年前人对这一问题的看法,综合其研究,以期为合理利用、科学管理天然草地提供理论基础。     

沙漠地基处理方法探讨

通过靖边天然气净化厂工程沙漠地基处理方法的选择，介绍了水坠、振冲沉管灌注桩、强务等方法处理松软细砂地基的机理、方法和效果。说明了地基处理应因地制宜，针对不同建、构筑物对地基的不同要求，选取一种或几种方法进行综合处理，以取得良好的社会、经济效益。     

强夯法加固靖边天然气净化厂沙漠地基

本文总结了陕甘宁中部气田靖边天然气净化厂采用强夯法加固沙漠地基的成功经验，介绍了强夯法在沙漠地基上施工的优越性，并对估算有效加固深度的梅拉公大修正值的选取进行了探讨和验证。     

EVA browning and the time-dependence of I−V curve parameters on PV modules with and without mirror-enhancement in a desert environment

Two independent experiments are described that were performed on samples of EVA-laminated photovoltaic modules which form part of a grid-connected PV system in the Negev desert. Both types of experiment provide quantitative assessments of the rate at which module output power decreases when mirror-enhancement is employed under such conditions. One of the experiments, performed on 60 modules which have been exposed to mirror-enhanced solar radiation for the past 8.4 years, compared the measured I−V curve parameters of these modules with corresponding measurements that had been made 3.4 years earlier. The second experiment consisted of monthly I−V curve measurements, spread over the last 3.4 years, on three specific mirror-enhanced modules and on another three from which the mirrors had been removed. These experiments indicated that the mirror-enhanced modules are continuing to degrade at a comparable rate to an indirect estimate that had previously been made, i.e. approximately 1% per year. On the other hand, the modules from which mirrors were removed 3.4 years ago, although visually as “brown” as the others are degrading at an, as yet, unmeasurably small rate.     

Mineralogical,geochemical and hydrocarbon potential of subsurface Cretaceous shales,Northern Western Desert,Egypt

Twenty four Cretaceous shale core samples of Gibb Afia-1, Betty-1, Salam-1X and Mersa Matruh-1 wells were mineralogically and geochemically studied using XRD, XRF and Rock Eval Pyrolysis. Kaolinite, smectite and illite are the main clay minerals in addition to rare chlorite, while the non-clay minerals include quartz, calcite, dolomite and rare siderite. The shales were derived through intensive chemical weathering of mafic basement and older sedimentary rocks. These sediments were deposited in a near-shore shallow marine environment with some terrestrial material input. The shales have poor to fair organic content. It is marginally to rarely mature.     

A Study of Microfacies and Petrophysical Analysis of Some Subsurface Cretaceous Rocks of Abu Gharadig-34 Well,Western Desert,Egypt

Abstract

The main aim of this study is to shed light on the microfacies association, petrophysical parameters, and depositional environment of different rocks such as sandstone, limestone, shale, siltstone, and dolomite of subsurface Cretaceous rock units (Abu Roash “C” member, Abu Roash “E” Member, and Bahariya Formation) from Abu Gharadig-34 well in the north western desert, Egypt. In this study, nine microfacies were identified. These microfacies include calcareous siltstone, bioclastic wackstone, ferruginous sublithic arenite, dolomitic lithic arenite, lithic arenite, fossiliferous bioclastic wackstone, glauconitic dolomitic sublithic arenite, ferroan dolomite, and ferruginous sandy siltstone. Generally, subsurface Cretaceous rock units are deposited in different depositional environments ranging from tidal flats to open circulation passes through restricted circulation shelves. Statistical analysis of the petrophysical data showed that the highest porosity was concentrated at Abu Roash “C” member, which had very good porosity and high permeability. The porosity increased when the bulk density decreased. The permeability of the studied samples was the same as the porosity, which increased when the bulk density decreased. It can be concluded that Abu Roash “C” member is a good reservoir in the Abu Gharadig-34 well.     

沙漠腹地筑路新材料的研制

介绍 ＣＡＳ型沙漠腹地筑路新材料的性能、施工工艺及工程应用实例,进一步通过经济分析指出了该材料的推广应用前景。