基于MODIS数据的雪面温度遥感反演

On the basis of simplification of the Planck function in a low temperature range, this paper revises the practical split-window algorithm and presents a method for retrieving snow surface temperature （Ts） based on MODIS data in the middle-latitude region. The application of this method in Qinghai Lake region reveals that it is feasible for the retrieval of Ts. Results of correlation analysis indicate that there was strong negative relationship between Ts and altitude. By analyzing three typical areas in which land cover was relatively homogenous, this paper discusses the relationship between Ts and normalized difference snow index （NDSI） and then presents a new concept named ＂NDSI-Ts space＂.     

History of faulting in the Northern Hastings Block,southern New England Orogen

Brittle failure is common in the Devonian to Permian rocks in the Northern Hastings Block (NHB) and is manifested by faults of different orientation and kinematic histories, but the timing of fault movement is not well defined. In this study, faults in the NHB were analysed with the map pattern of cross-cutting faults used to estimate the relative time of movement and relationship to other faults. We defined five episodes of faulting or fault reactivation that affected the NHB. The Yarras Fault System on the southwestern side of the NHB and the Parrabel Fault and related faults on the eastern side of the NHB are the two major fault systems responsible for transporting and rotating the NHB in the late Carboniferous. Faults on the eastern, northeastern and northern part of Parrabel Dome started and stopped moving after emplacement of the Hastings Block and before the intrusion of the Werrikimbe Triassic granitoids. We suggested that the movement on the major bounding faults is related to the accommodation of the NHB to the folding and cleavage development in the adjoining Nambucca Block, and is associated with the earliest part of the Hunter–Bowen Orogeny. Limited dextral movement on the extensions of the Taylors Arm Fault System caused minor displacements in the northeastern part of the NHB during the Late Triassic. Some small faults cut the Triassic granitoids or Triassic Lorne Basin sediments indicating tectonic activity continued post-Triassic.     

松花江上游地区汞污染的化学生态效应

采样分析了吉林省东部松花江上游金矿开采区及其附近水、土壤、动植物及河流沉积物样品中汞的含量，发现河流沉积物中汞的污染相当严重；受其影响当地的植物和两栖类动物——中国林蛙体内总汞和甲基汞含量也明显高于对照组。实验表明，林蛙内脏对汞的富集能力大于肌肉；秋季对汞的富集大于春季；河流沉积物中甲基汞的含量与林蛙体内甲基汞的含量有较好的正相关。汞污染的来源与区域内个体金矿的滥采滥排有直接关系，表明人类活动所产生的有毒重金属在地表过程中出现了化学生态效应。     

周期性饥饿对褶皱臂尾轮虫实验种群特征参数的影响

实验设置了一直投喂、周期性饥饿1,2,3,4d和一直饥饿6个处理组,采用轮虫单个体培养,检验周期性饥饿对褶皱臂尾轮虫(Brachionus plicatilis)实验种群特征参数的影响.结果表明:一直投喂组的生殖价最高,对轮虫种群的潜在增长最有利,随饥饿强度的增大,生殖价减小.不同处理下,轮虫个体寿命与其生殖期之间存在显著的正相关(r=0.747).轮虫在受到饥饿后,寿命略有增长,但不同处理对轮虫的平均寿命(10.8~13.1d)和生殖期(6.3~8.3d)均未达到显著差异(P>0.05).饥饿强度增大时,轮虫个体的总产幼数、总产卵量显著下降(P<0.05),产第1幼、最后1幼、第1卵、最后1卵时间显著延长(P<0.05);同时,种群参数的世代时间(T)随饥饿强度增加而增大,内禀增长率(r_m)、周限增长率(λ)和净生殖率(R₀)却明显下降.     

基于ArcGIS Engine的矢量地理数据数字水印系统的设计和实现

用VS2005（C＋＋）和ArcGIS Engine开发矢量地理数据数字水印系统。首先介绍矢量地理数据数字水印系统的实现方案;然后阐述基于ArcGIS Engine读取矢量数据的关键技术;最后实现对Shapefile数据格式的水印嵌入和提取操作,并给出可视化比较结果。系统的实现有助于降低开发难度,提高数字水印系统开发的灵活性和开放性。     

环境考古视角下的丝绸之路早期城址:从河西走廊到中亚

根据年代和考古遗址的空间分布,对河西走廊东部民勤三角城、金昌三角城,新疆的奎玉克协海尔古城,以及中亚的Kyzyl tepa古城的年代、形状、筑造方式等做了对比,并分析了不同时期的古城址和同区域的考古文化遗址之间的空间关系.结果 表明,这3个地区的古城址大致形成于相近的时代,且都是就地取材,充分利用原始的地势而筑城.城墙...     

跨国整车企业在华投资的区位选择研究

首先运用ArcGIS 9.2软件对跨国整车企业在华投资的空间格局进行分析,结果表明,跨国整车企业在华呈沿海沿江布局,呈"T"型结构,具体形成长三角、珠三角、环渤海、东北、中部以及西南等六大地方汽车企业网络;然后运用Eviews 3.1软件,采用选择泊松回归模型分析方法,具体结合城市基础设施建设、可达性、人力资源以及拥有权力等方面的9个影响因素对跨国整车企业在华投资的区位选择影响因素进行定量分析。     

Advances in the Research of Impact of Decadal Solar Cycle on Modern Climate

Role of solar activity on modern climate change, particularly in the decadal scale is an important scientific issue. This paper reviews the recent observation of decadal solar signal in earth’s climate, with focus on the mechanism of solar radiation, ultraviolet radiation and cosmic rays on climate system ,and its validation. The paper points out that the assessment of uncertainty in observations, amplification process of the climate system, as well as possible future impact of solar extreme events are challenges in the present study. Finally, the keys of breakthrough are pointed, to provide a reference for future research.     

海洋浮游动物多样性及其分布对全球变暖的响应

针对日益加剧的全球增温和生物多样性丧失等现象,结合浮游动物在海洋生态系统中的重要性,从世界各大海域的浮游甲壳类、水母类及毛颚类等群落对海洋表层温度升高及海流变化的响应等方面进行了综述,以期为进一步深入开展相关研究提供参考。     

The impact of sulfate reduction on the distribution of methylmercury in reservoirs in the city of Guiyang

In this paper, the relationship between sulfate reduction potential and mercury methylation potential was studied in the Aha, Baihua and Hongfeng reservoirs from Guiyang City. The methylmercury (MeHg) concentrations of lake water in the Aha Reservoir were greatly elevated as compared to those of the Hongfeng and Baihua reservoirs, which was correlated with its distinctly high SRB abundance, SO42-, and S2- concentrations. Among the three reservoirs, however, the highest MeHg was observed in in the top several centimenters of pore water profile in the Hongfeng Reservoir where the lowest S2- in pore water occurred. The distributions of MeHg in lake water and pore water showed the highest methylation potential occurred at water-sediment surface for the Aha Reservoir and the in the top several centimenters of sediments for the Hongfeng Reservoir. It is guessed that the highest mercury methylation only occurs at the sites with certain sulfide concentrations.