高速公路路面基层材料最大干密度的试验研究

首先对襄荆高速公路路面基层材料做了物理特性分析,在此基础上进行了水泥稳定碎石混合料的初步设计.并采用重型击实法确定最大干密度的最佳含水量,然后在混合料中外掺10%,15%,20%的石屑(粒径4.75mm以下)进行击实,最终得到理想的最大干密度.通过对以上具体试验的分析,得出了水泥稳定碎石最大干密度的确定方法及原则,确定了一个比较合理的石屑掺量,对其它的路面基层具有一定的指导意义.     

卫星反演太阳紫外辐射数据产品在东疆黑戈壁区域的适用性验证

论文利用2017年东疆哈密地区红柳河黑戈壁地面高精度紫外辐射实测数据与美国NASA Langely研究中心大气科学数据中心提供的CERES_SYN1 deg_Ed4A产品数据,对卫星反演的紫外辐射A、B波段(UVA和UVB)数据在该地区的适用性进行了对比验证。结果表明：① 在日尺度上,该地区地面实测紫外辐射UVA和UVB与卫星反演数据之间的相关系数达0.9以上,其中在全天空情况下UVA平均偏差为1.15 W·m ^-2、UVB 平均偏差为0.03 W·m ^-2,晴天条件下UVA和UVB的平均偏差分别为0.93 W·m ^-2和0.03 W·m ^-2;② 在季节尺度上,实测和卫星反演UVA和UVB的偏差夏季最大,分别为2.04 W·m ^-2和0.05 W·m ^-2,春冬两季次之,秋季最小;③ 红柳河地区在春夏两季受到气溶胶光学厚度(AOD)影响较大,呈现显著负相关;④ 云量越大,紫外辐射削弱程度越大,在多云条件下地面实测与卫星反演UVA与UVB偏差最大,分别为1.73 W·m ^-2和0.05 W·m ^-2。     

基于Google Earth的地铁亦庄线GPS控制网布设

Google Earth是一款全球卫星地图集成软件,用户除了可以更方便地浏览三维地物、更快捷地获取经纬度和海拔数据外,还可自由地定制图标、线路和漫游方式.地铁亦庄线是拟建的规划线路,经过对测区的分析和现场踏勘后,考虑到在Google Earth上比在普通地图上选点更方便、更直观,采用在Google Earth影像图上布设地铁亦庄线的GPS控制网,这对实地布设GPS控制网有一定的指导作用.     

基于Web的地质灾害预警信息发布与反馈系统研究

对河南省地质灾害预警预报系统,县（市）地质灾害调查与区划成果资料进行分析研究,以商城县地质灾害预警为例,将预警网格作为关联字段,对地质灾害预警结果库、地质灾害基础数据库进行关联处理,建立带有空间预警网格及地质灾害基础信息的地质灾害数据库,按照省国土资源厅统一制定的地质灾害上报表格,以河南省地质环境信息网为系统平台,采用asp动态网页设计语言,设计预警结果区地质灾害信息查询以及地质灾害反馈等页面,从而建立基于Web的地质灾害预警信息发布与反馈系统。     

四川省的一种潜在优势石材资源--铁路道碴用岩石

全国铁路大提速,现有铁路设施急需改造,新建铁路也将按照新的速度标准进行设计和施工。因此,铁路道碴必须按新的质量标准进行更换。市场需求迫切,容量空间巨大,我省此类石材资源具有量大、质优、区位分布合理等优势,应重视和加强铁路道碴石材资源的勘查评价,为四川铁路的全面提速,提供坚实的物质基础。     

国家西部测图工程成果1980西安坐标系与CGCS2000国家大地坐标系转换方案的设计与实现

通过对西部测图工程成果数据的坐标转换试验,提出了一种有效的坐标转换方案。文中详细探讨了转换过程中的技术要点、解决方案以及在VB．NET中代码实现的过程。     

Growth and feeding habits of invasive Pseudorasbora parva in the Chabalang Wetland(Lhasa,China) and its trophic impacts on native fish

In recent years, fish invasion has become one of the main reasons for the decline of native fish stocks. Pseudorasbora parva is considered one of the major invasive species worldwide. The present study investigated the fish resources of the Chabalang Wetland (Lhasa, Tibet) during diff erent seasons in 2009 and 2013. Four hundred and twelve individuals were subsampled to estimate age, growth, and feeding habit of P . parva . Furthermore, food relationships between P . parva and the native Schizothoracinae fish were also examined. The results revealed a significant shift in species composition and community structure characterized by the disappearance of native fish and outbreak of non-native fish. The percentage of nonnative P . parva in the fish collections significantly increased from 33.64% in 2009 to 64.08% in 2013. The standard length (SL) ranged from 22.00 to 78.71 mm, and their age was 1–5 a. The von Bertalanff y function was used to model the observed length-at-age data as L t =112.19(1–e^-0.1495 ( t +0.8012)) for females and as L t =123.12 (1–e^-0.1500 ( t +0.7132)) for males. The results indicated that P . parva in Tibet has lower growth and mortality rates compared with that from the native ranges. Ninety-seven prey taxa belonging to 9 prey categories were identified in the gut of 38 P . parva . P . parva can be considered a generalized and opportunistic predator, competing with the native fish, especially Schizothorax o’connori , Schizopygopsis younghusbandi younghusbandi , and Ptychobarbus dipogon , for Bacillariophyta and Chironomid larvae. This is an important reason for the decline in native fish population.     

海底天然气水合物开发的前景研究——基于经济可行性的视角

海底天然气水合物的开发利用对于国家能源安全与环境保护具有重要意义。然而,作为一种新型深海能源,海底天然气水合物至今仍未实现商业化生产。除开发技术等因素外,天然气水合物开发投入、产出的成本问题也是制约海底天然气水合物大规模开发的另一关键因素。文章从经济可行性的视角分析海底天然气水合物目前开采成本、未来开采成本的变化以及未来的价格优势,从而对天然气水合物开发的前景进行相关研究。研究结果显示,虽然目前天然气水合物的开采成本要高于常规天然气,但随着今后开采技术的改进,天然气水合物开采的总成本、边际成本和平均成本都会相应降低,当天然气水合物的价格低于常规天然气价格时,天然气水合物的商业化生产便可能实现。     

Re-Os isotopic dating and geological significance of molybdenite from Xintian Cu-Mo polymetallic deposit in Yanbian,Jilin

Xintian polymetallic deposit is a hydrothermal vein type Cu-Mo deposit. Analysis on Re-Os isotopic dating for the molybdenite from this deposit is undertaken to determine metallogenic epoch and dynamics setting of the deposit. Re-Os isotopic dating for the molybdenite yields model ages ranging from 123. 9 ± 1. 9 Ma to 124. 7 ± 1. 8 Ma,with a weighted mean age of 123. 4 ± 0. 81 Ma,and an isochron age of 127 ± 16 Ma,MSWD= 0. 25,indicating that the metallization was at late Yanshanian. The content of Re in molybdenite is( 330. 1± 4. 0--367. 9 ± 3. 1) × 10~(-6),which demonstrates mantle derived metallogenic sources. Integrating the regional tectonic evolution and the metallogenic characteristics of other contemporaneous Cu-Mo deposits in the region,it is suggested that the Cu-Mo mineralization of this deposit occurred in an active epicontinental environment under lithospheric extension resulted from the subduction of the Izanagi plate to the Paleo-Asia continental margin at late Yanshanian. The Mantle wedge was partially melted with large amount of metallogenic elements dissolved in it. Under the favorable conditions of crust-mantle interaction,large-scale magmatic activity turns out to be the important mechanism of the mineralization of many Cu-Mo deposits in the Xiaoxingan Range--Zhangguangcai Mountain metallogenic belt,including the Xintian Cu-Mo polymetallic deposit.     

辽河盆地新生代构造演化模式

辽河盆地新生代火山岩的分布规律和岩石学特征表明：辽河盆地新生代的构造环境的为大陆裂谷。地壳深部资料显示了辽河地区存在上地幔隆起,它控制了浅部构造的发育。而辽河盆地新生代断裂构造组合,反演出辽河盆地新生代４期的构造应力作用方式。为此,笔者将造山和成盆作用纳入统一的动力学机制,提出了辽河盆地新生代构造演化的动力学模式。