退耕精确监测及其在辅助决策中的应用研究

退耕还林是党和政府为改善我国西部地区脆弱的生态环境而实施的一项重大工程，投入大，周期长。各级政府、党政领导人都很关注退耕后的实际成效。本文结合林业部门的具体退耕工作流程，介绍了对退耕还林工作进行精确监测的方法，提出了与具体退耕业务相结合的辅助决策应用、系统维护和数据更新模式．讨论了实现退耕精确监测的方法以及在政府辅助决策实际应用过程中的问题。     

北海市矿产资源开发与环境保护问题

文章分析了北海市矿产资源开发现状和产生的环境问题 ,提出了减轻矿业开发对土地和环境负面影响的对策措施 ,倡导土地和矿产资源的统一管理以加强矿山环境保护工作。     

Dwarf LSB galaxies and their environment: The Virgo Cluster, the Ursa Major Cluster, isolated galaxies and voids

The widely varying dwarf galaxy counts in different environments provide a strong challenge to standard hierarchical clustering models. The luminosity function is not universal, but seems to be strongly dependent upon environment. In this paper we describe an automated procedure for detecting and measuring very Low Surface Brightness (LSB) features in deep CCD data. We apply this procedure to large area CCD survey fields of the Virgo cluster and find 105 dwarf LSB galaxies previously uncatalogued over an area of ∼14 sq deg. We show that there are many more faint (14≤M_B≤–10) LSB galaxies than would be predicted from extrapolation of the Virgo cluster catalogue luminosity function. Over our limited range of measurement the faint end slope of the luminosity function becomesα=–1.6. Although these galaxies contribute a small fraction of the total stellar light of the cluster, they may contribute significantly to the mass in galaxies if they have large mass-to-light ratios similar to those recently measured for Local Group dwarf galaxies. By a comparison with different environments, the Virgo Cluster seems to be highly `dwarf rich' if considering the dwarf to giant ratio or it's luminosity function faint end slope. This revised version was published online in July 2006 with corrections to the Cover Date.     

煤矿开采对明水泉的影响浅析

明水泉群为我国北方罕见的岩溶大泉，具有典型的雨源型特征。大气降水和雨洪水下渗后，向明水一带汇集，受西部文祖断层阻挡而富集，受上覆煤系地层阻隔而承压，在特定的构造条件下，沿断层破碎带或人工钻孔涌出地表，便形成明水泉群。煤系地层是明水泉群形成和存在的基本地质条件之一。煤矿开采吸引大量岩溶泉水，而且破坏原生的地质结构，影响明水泉群的正常出流，危及明水泉群的存在。针对煤矿开采对明水泉群的影响，建议实施相应保泉措施。     

一种后现代的叙事模式——东西小说叙事策略探微

东西的小说创作．尤其是20世纪90年代中期以后的相当一部分作品，在主题思想和叙述策略上均具有鲜明的后现代倾向，足以形成其独特的艺术方式，以后现代主义文学与叙事学的相关理论，从东西小说创作的叙事手法和叙述语言等方面出发，试图对东西小说独特的叙事艺术予以解读。     

气象公益服务管理问题论纲

气象公益服务管理问题在社会主义市场经济条件下亟待强化。人们迫切需要对公益服务管理的地位与作用、主要内容、目标与原则以及领导体制等问题进行系统化的理论认识。     

CSRH模拟接收机设计

本文叙述了日像仪实验的方案，双天线干涉仪中模拟接收机的结构，灵敏度，动态范围，噪声，增益的各级分配等问题，基于实验方案设计了日像仪模拟接收机。     

Wisconsinan Late-glacial environmental change on the southeast Baffin shelf,southeast Baffin Island and northern Labrador

The importance of the Baffin-Labrador region is explained in terms of the channelling through this area of the mass flux of meltwater from the Laurentide Ice Sheet and the probable effects of this on the thermohaline circulation of the North Atlantic. The chronology of glaciation and deglaciation in the region is summarised. Reference is made to recent marine records from the Baffin Shelf. Isotopic changes recorded in foraminiferal assemblages obtained from marine sediments in the Baffin Shelf-Labrador Sea area indicate the timing and possible magnitude of meltwater fluxes during the period 14.0-11.0 ka BP.     

时间频率溯源链的重要特性及其应用

主要以美国国家技术标准研究院(NIST)的时间频率溯源链系统为典型,给出其方框图和技术指标,并述评了NIST的宗旨、任务,及时间频率溯源链的重要特征是:拥有高精度的铯喷泉原始频率基准(准确度、稳定度均~1.10-15);在时间频率传递方法和技术研究开发方面处于领先地位;在远程校准的频率测量和分析系统(FMAS),及溯源链系统的尖端装备的高集成化、自动化、智能化、轻量化品质方面均达到先进水平。并综述了高精度的时间频率同步系统在天文学测量、导弹发射、导航、定位等科学实验研究领域中的重要作用和目前达到的关键技术指标。