我国古代两种珍稀宝玉石文物分析

为了科学辨别易混淆文物的材质,以蓝绿色和蓝紫色宝玉石文物为例,利用外束质子激发X射线荧光、便携式能量色散X射线荧光、激光拉曼光谱和X射线衍射分析等现代无损科技手段,从安徽蚌埠双墩一号春秋墓、河南洛阳烧沟东汉墓和新疆和田皮山古城唐代墓葬中甄别与鉴定出被误认为是绿松石和琉璃（玻璃）器的天河石串珠和青金石耳？及青金石管饰。简要阐述了这两种彩色宝玉石的矿物学特征及应用历史。这三件彩色宝玉石文物的发现,丰富了中国宝玉石史的研究内容,拓宽了对我国古代先民开采、引进及应用宝玉石的认识。     

乌裕尔河流域颗粒有机碳的来源：碳同位素证据

以2008、2009年所采集的乌裕尔河9个点位水体中的悬浮物为研究对象,对丰、枯水期颗粒有机碳（POC）含量、碳同位素组成（^13C、^14C）及表观年龄进行了系统测试与分析,以期探讨河流中颗粒有机碳来源与流域土壤侵蚀的关系。研究结果表明,该河流中颗粒有机碳（POC）主要来源于未受玉米残体及根系输入影响的深层土壤,且土...     

双频激电在内蒙中部地区矿产评价中的应用

针对工作区地表干燥、基岩裸露、电极接地和供电比较困难等因素,采用双频激电中梯装置方法工作。根据圈定的激电异常组合特征,对激电异常进行了分类和综合解释推断,区分出矿（化）体和含炭质地层干扰异常,以此确定地表工程揭露位置。工程揭露结果与激电异常的解释结果基本一致,说明在一定的条件下,利用激电异常的展布及组合特征区分矿与非矿是可行的。     

Petroleum System of the Fula Depression at the Muglad Basin in the Central African Fault Zone

Petroleum system theory has been used to study characteristics of the Fula depression in the Central African fault zone.In this system,deep lacustrine facies mudstone in the Abu Gabra For-mation of the Lower Cretaceous is a very good source rock,thick deltaic facies sandstone of the Abu Gabra Formation and fluvial facies sandstone of the Bentiu Formation are good reservoir beds,and the mudstone in the Upper Cretaceous Darfur Group is the regional cap rock.The oil search mode and fault block trap seal-off co...     

Retrieval and analysis of coal fire temperature in Wuda coalfield,Inner Mongolia,China

Coal fire burning around the world is an environmental catastrophe characterized by the emission of noxious gases, particulate matter, and condensation by-products. In this study, coal fire temperature is retrieved based on Landsat 5 TM images and Generalized Single-Channel Algorithm (GSCA), in Wuda coalfield, Inner Mongolia, China. Then coal fire zones are extracted by Jenks′ natural breaks and threshold methods based on temperature images. Changes of coal fire zones are analyzed from 1989 to 2008. The results are summarized as follows: 1) The coal fire temperature retrieval method based on Landsat 5 TM and the GSCA model is effective and feasible, because the temperature error is relatively small (from –2.9℃ to +2.6℃) between the measured temperature and the retrieved temperature. 2) The accuracy is relatively high to extract coal fire zones through the Jenks′ natural breaks and threshold methods, because 83.56% of surveyed area is located in the coal fire zones extracted in 2005. 3) The coal fire area increased 9.81 × 10 5 m 2 from 1989 to 2005, and the annual growth is about 6.1 × 10 4 m 2 , with an annual increasing rate of 2.48%. The area of coal fire decreased by 8.1 × 10 5 m 2 from 2005 to 2008.     

The bulk transfer coefficients in the permafrost region at the Tanggula Pass of Tibetan Plateau

This paper presents research on the surface drag coefficients, C_D, and the bulk transfer coefficients of sensible heat flux, C_H, in the permafrost region at the Tanggula Pass of the Tibetan Plateau. The data were obtained from the Open-Path Eddy Covariance System and the 10-m Automatic Weather Station (AWS) at the TGLMS site which supported by Cryosphere Research Station (Chinese Academy of Science) on the Qinghai-Xizang Plateau (Tibetan Plateau). The characteristics of C_D and C_H in relation to atmospheric instability and wind velocity are discussed, and it was found that the bulk transfer coefficients varied with air conditions and were different in different months. However, the bulk transfer coefficients obtained from the eddy covariance system did not show a significant increasing trend with increasing atmospheric instability, and the bulk transfer coefficients did not change greatly with increasing wind velocity at 10 m.     

Spectral Analysis of the Flare of 1998 November 11 based on the Multi—cloud Model

1 INTRODUCTIONAlthough coronal mass ejection (CME) as a representation of solar eruptive events has be-come a most popular subject in solar physics since the rapid development of space observations,the study of solar flares remains attractive. Modern space and ground-based observations showthat solar flares are loop phenomena, in general, they are composed of several loops forminga loop system. There are two kinds of loops: X-ray loops and post-flare loops; the former arehot loops observ…     

GPS测站位移速率的解算方法

对目前4种常用的利用GPS复测资料解算测站位移速率的方法进行了分析，通过实例对比了4种方法的结果。坐标法可以直接利用多期复测结果得到测站大地坐标，但要求坐标在同一参考框架内，并采用相同的参考椭球；基线方法可以消除或削弱观测系统的系统误差，与参考框架无直接关系，但在平差计算时至少要引入1个起算点，起算点高程方向的误差会削弱其他点平面坐标的精度，并进而影响位移速率的精度；在选定不同基准解算位移速率时相似变换方法是十分有效的，但如果复测结果不在同一参考框架中，其结果存在框架不一致所带来的误差；QOCA方法能够综合利用多种观测数据，可以把区域观测数据和全球观测数据稳健地结合起来，在削弱观测期间突变因素的影响方面比其他方法具有便利之处。     

Development,territorial difference and spatial evolution of towns in China—A discussion on the views of anti-urbanism in China

Growth of Chinese small towns is a continuing process of urbanization. By analyzing regional disparity and comprehensive development level of Chinese small towns, it is considered that town development depends mainly on the regional agriculture and social development level. Their spatial distribution is restricted by population distribution and regional economic development level. Chinese urbanization, just the same as urbanization in developed countries, is a sign of socio-economic vigour and prosperity, and is not related to social and political systems. Thus, it is worth to discuss China’s anti-urbanism with abroad scholars.