栅栏在防止前沿积沙中的作用——以沙坡头地区为例   总被引：2，自引：0，他引：2  

凌裕泉  金炯  邹本功  丛自立  温向乐  屠 《中国沙漠》1984,4(3):16-25

在沙坡头地区的铁路北侧,进行了防护带的前沿栅栏阻沙试验研究。经过三个风季初步观测表明:格状沙丘的主梁移动是缓慢的,通过栅栏阻沙量计算求得其移速为0.56米/年。而沙丘副梁的前移迅速是格状沙丘的主要运动及其危害形式。据测定主风向上的可能输沙量平均为6.5m³/米宽·年,栅栏阻沙量平均为5.5m³/米宽·年,栅栏平均阻沙效率为70-80%。因此,利用栅栏等工程措施防止防护带前沿积沙是可行的,有效的。  相似文献   

Ionic‐Liquid‐Assisted Hydrothermal Synthesis of Ag/AgBr for Photodegradation of Imidacloprid under Visible Light     

Dandan Guo  Xiaoqing Zhu  Sheyun Chen  Cenling Wang  Mingli Pi  Xiaoxia Chen  Yuqing Shi  Jingtao Dai 《洁净——土壤、空气、水》2019,47(5)

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Method for Determining CYP2C9 Activity in Earthworms and its Responses to Benzo[a]pyrene or Pyrene in Soil     

Xiaoxia Yang  Jiuping Gong  Jianrong Kai  Yufang Song  Junjie Lin  Jianfei Liu 《洁净——土壤、空气、水》2019,47(7)

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大气负离子自动测报仪的研制     

李伟  王经业  陆勇  刘凤琴  涂满红 《气象科技》2008,36(6):834-836

空气中负离子浓度是空气质量好坏的标志之一.为了满足国内外相关部门对测量大气负离子仪器的需求,研制开发了专利产品WIMD-A系列大气负离子自动测报仪,该自动测报仪符合相关的国家推荐标准,实现了从数据采集到传输的全部自动化、智能化,工作环境的空气湿度可以从0～100%,彻底取代了人工观测.业务运行结果表明仪器忭能稳定,工作可靠,减轻了观测人员的工作强度.  相似文献   

陕西南部含钾岩石的分布特征与找矿方向讨论   总被引：3，自引：2，他引：1  

涂怀奎 《化工矿产地质》2000,22(4):244-250

在对陕西南部区域地质背景分析的基础上 ,通过对研究区含钾岩石分布特征的初步研究认为 ,本区含钾岩石均围绕地台与地槽边缘分布 ,可划分为碎屑岩型、火山熔岩型、正长岩型、伟晶岩型 4种类型。含钾岩石开发的前景在于 :加强试验研究、综合找矿、综合评价。  相似文献   

秦巴山区重晶石与毒重石矿床成矿特征研究   总被引：3，自引：0，他引：3  

涂怀奎 《化工矿产地质》1999,21(3):157-162

秦巴山区按地质成矿特征可划分大巴山、平利、南秦岭三个区。重晶石与毒重石矿床分三条成矿带 :南带为毒重石矿带、北带与中带为重晶石矿带 ,成矿具有多期作用 ,含火山喷发、大陆边缘沉积、裂谷与脉体成矿叠加。本区找矿前景是乐观的。  相似文献   

秦岭地区煌斑岩特征及其与金矿成矿关系   总被引：1，自引：1，他引：0  

涂怀奎 《黄金地质》1999,5(4):37-42

秦岭地区广泛分布有煌斑岩,其主要赋存于古生界志留系与濯舅系的粉砂质板岩中,大部分含金较高。经不同成矿区煌斑岩与金矿关系的对比研究,认为其具有相似性,并与金成矿关系密切。对煌斑岩出露区的找矿标志以及本区的找矿方向作了分析。  相似文献   

Correlation of mineralogical and textural characteristics with engineering properties of selected granitic rocks from Turkey   总被引：3，自引：0，他引：3  

A. Tu rul  I. H. Zarif 《Engineering Geology》1999,51(4):506-317

Granitic rocks show a variety of engineering properties that may affect quarrying operations, tunneling, mining, slope stability and the use of rock as a construction material. The physical and mechanical properties are a function of the mineralogical and textural characteristics of the rock. The purpose of this study is to apply correlation analysis to investigate the relationships between petrographical and engineering properties of granitic rocks. A variety of granitic rock samples from different parts of Turkey were subjected to petrographic studies. The same samples were then tested to determine specific gravity, dry and saturated unit weight, water absorption, effective and total porosity, sonic velocity, Schmidt hardness, point load strength index, uniaxial compressive strength, tensile strength and modulus of elasticity. The relationships between these properties and the petrographical characteristics are described by simple regression analyses. The study revealed that the influence of the textural characteristics on the engineering properties appears to be more important than the mineralogy. It also determined that the types of contacts, grain (mineral) shape and size significantly influence the engineering properties of the granitic rocks.  相似文献   

Research on limestone decay in a polluting environment, I˙stanbul-Turkey     

A. Tuğrul  H.Ì. Zarif 《Environmental Geology》1999,38(2):149-158

 I˙stanbul, the capital of the east Roman, Byzantine and Ottoman Empires embraces two continents, one arm reaching out to Asia, the other to Europe. It is therefore, a rich city in terms of monuments and historical cites. Shell limestones of Upper Miocene age are used as building stone in the majority of the monuments in I˙stanbul because of their attractiveness, availability and workability. The durability characteristics of the limestones are examined, and those factors that are responsible for atmospheric weathering are discussed, in a humid and marine environment with important problems of urban pollution, specifically due to traffic. In the present study weathering of the building stones were first examined in situ by macroscopic observations. The weathering that developed as a result of environmental effects since this limestone was first used in historical monuments has been affected 0.1–1.5 cm deep from the surface. The weathered facing stone of Şehzade Mehmed Mosque in I˙stanbul is undergoing a program of progressive replacement. During this study, samples were taken from this monument where the shell limestone was used. The stone surface was principally examined by means of Scanning Electron Microscopy (SEM). Petrographical and mineralogical analyses were made by using optical microscopy and X-ray diffraction method. The physico-chemical properties of these rocks control their weathering behaviour and reactivity. Major and trace element analyses and the effect of deterioration on the physical properties of the limestones (unit weight, porosity and water absorption) have also been investigated. Studies on the samples implies that weathering on the stone surface caused important variations on the physical characteristics of the rock. Received: 11 February 1998 · Accepted: 18 August 1998  相似文献   

老君山成矿区变质成因夕卡岩的地质地球化学特征   总被引：16，自引：1，他引：15  

曾志刚  李朝阳  刘玉平  涂光炽 《矿物学报》1999,19(1):48-55

老君山成矿区广泛分布的夕卡岩是主要含矿岩层。通过对夕卡岩地质特征岩石化学特征、稀土结球化学特征和成岩年龄的分析研究,证明了夕卡岩是区域变质作用的产物。  相似文献