山东省气象局电视会商会议系统简介

主要介绍了山东省气象局电视会商会议系统，包括该系统的整体结构、设备和网络情况，以及该系统所具有的功能及其在气象工作中的作用。     

遥感技术在地质灾害调查及灾害规律研究中的应用——以辽宁省建昌县为例

地质灾害与地质环境条件、人类工程活动关系密切,严重威胁着人类生命财产安全,制约社会经济的可持续发展。运用遥感技术对辽宁省建昌县进行地质灾害调查,利用ENVI5.3软件对高分二号数据进行预处理,建立遥感解译标志并开展了野外验证,最终解译滑坡、崩塌、泥石流、地面塌陷等地质灾害点75个;同时,利用Arcgis10.4空间分析功能,对遥感解译地质灾害点与地貌、坡度、坡向、构造、水系及人类工程活动等因子进行叠加分析,基本查清了研究区地质灾害规模、空间分布特征和发育规律,为研究总结区域上地质灾规律及有效预防提供了详实可靠的基础资料。     

新类型金矿──萤石型金矿的矿石物质成分及组构特征

浙江东南地区的萤石型金矿,系一新类型金矿床。矿石学研究表明,其主要工业矿物为银金矿,与之共生的矿物有黄铁矿、黄铜矿、方铝矿、闪锌矿、辉银矿等。矿石结构构造有多种,矿床的形成有多期次。成矿与硅化,黄铁矿化和萤石化相关。     

Five-Stage Model of the Palaeozoic Crustal Evolution in Xinjiang

The great majority of the Palaeozoic orogenjc belts of Central Asia are of the intercontinental type, whose evolution always follows a five-stage model, i.e. the basal continental crust-extensional transitional crust-oceanic crust-convergent transitional crust-new continental crust model. The stage for the extensional transitional crust is a pretty long, independent and inevitable phase. The dismembering mechanism of the basal continental crust becoming an extensional continental crust is delineated by the simple shear model put forward by Wernike (1981). The continental margins on the sides of a gently dipping detachment zone and moving along it are asymmetric: one side is of the nonmagmatic type and the other of the magmatic type with a typical bimodal volcanic formation. In the latter case, however, they were often confused with island arcs. This paper discusses the five-stage process of the crustal evolution of some typical orogenic belts in Xinjiang.     

Abundance and Distribution of Fatty Acids in Sediments of the South Mid-Atlantic Ridge

Sediment samples obtained from the South Mid-Atlantic Ridge were studies by gas chromatography-mass spectrometer(GC-MS) for the abundance and distributions of total fatty acids(TFAs). Approximately 34 fatty acids were identified, with the chain-lengths ranging from C12 to C30. The total concentrations of TFAs(∑TFA) ranged from 7.15 to 30.09 μg g-1 dry sediment, and ∑TFA was weakly correlated with bitumen content(R2 = 0.69). The ∑TFA of samples around hydrothermal areas were significantly higher than that of samples away from hydrothermal areas, indicating intense primary production and large biomass in the hydrothermal areas, and suggesting a close relationship between hydrothermal activity and ∑TFA of samples. The characteristics of the TFA composition in the present study are rich in monounsaturated fatty acids and lacking in polyunsaturated fatty acids, and the ratios between the concentrations of monounsaturated fatty acids and ΣTFAs in samples close to the hydrothermal areas, are about 0.8, but for samples far from the hydrothermal areas, they are only about 0.5. Several fatty acids(e.g., a/i C15:0 and C16:1ω7), which are signature biomarkers for sulfur-metabolizing bacteria, show the same distribution trend as ∑TFA of samples, further highlighting the close relationship between fatty acid content and hydrothermal activity and/or hydrothermal communities. The metabolic activities of hydrothermal communities, especially those of microorganisms, are likely the main source of fatty acids in samples.     

内蒙古迪彦庙蛇绿岩带早石炭世闪长岩成因与古亚洲洋洋内俯冲作用

由于缺少对SSZ型蛇绿岩和洋内弧火成岩的系统研究,制约了古亚洲洋东段古生代洋内俯冲过程的进一步认识。本文报道了内蒙古迪彦庙SSZ型蛇绿岩带北部新发现的巴嘎哈尔早石炭世闪长岩。LA-ICP-MS锆石U-Pb定年显示,巴嘎哈尔闪长岩的侵位年龄为324.2±1.8 Ma,其形成时代为早石炭世末期。巴嘎哈尔闪长岩SiO₂含量为57.71%～61.24%;高铝(Al₂O₃含量为15.58%～16.68%);具有相对富钠(Na₂O含量为3.29%～4.15%)、低钾(K₂O含量为1.05%～1.69%)的特征,Na₂O/K₂O比值为2.18～3.95;MgO含量较高(3.30%～4.23%),Mg^#为47.20～51.82;贫TiO₂(0.65%～0.76%)和P₂O₅(0.14%～0.15%);稀土元素总量(ΣREE为85.19×10^-6     

黑龙江省耕地非农化的空间格局与重心曲线分析

为了揭示耕地非农化的空间格局与重心曲线,为耕地资源保护和利用政策制定提供决策支撑,该文以黑龙江省1980、1990、2000、2010、2015年土地利用数据为基础,运用GIS空间分析方法,引入重心模型分析黑龙江省耕地非农化的空间格局及重心曲线。研究结果表明:1980—2015年黑龙江省耕地非农化发展不平衡,4个时期耕地非农化面积呈波动增长的趋势;耕地非农化等级空间分布特征明显,等级较高的城市集中分布在西部地区;耕地非农化速度等级的重心曲线在空间分布上,具有从中心向边缘延伸的特点;耕地非农化围绕中心地区进行,其空间扩散路径在图形上呈现出一个回旋状。     

北斗二号与北斗三号完好性参数设计差异分析

针对能够标识北斗二号与北斗三号系统服务完好性的参数差异问题,该文从完好性参数定义、导航电文结构、参数内容和播发方式等方面对北斗二号和北斗三号系统完好性参数播发现状进行了比对分析,并对各类参数的工程实现情况进行了比较,结果表明:在兼容北斗二号基本导航服务相关系统完好性参数的基础上,北斗三号增加了可快速标识服务精度及预测精度的完好性参数;受多方面的约束与局限,北斗二号仅具备提供单频改正的广域差分增强服务的能力,且无相关国际标准规范支撑,而北斗三号为能获取国际民航组织测试认证,已立足于国际相关标准规范进行了可支撑单、双频改正的星基增强服务工程实现.     

动态水深环境下的无人艇路径规划

针对D* Lite算法存在路径转折点多、难以进行轨迹跟踪控制、没有顾及动态水深变化等不足,该文引入水深危险度,进行安全路径的选优,以提高所规划路径的安全性,并采用视线检查算法和懒惰更新改进D*Lite算法进行路径规划,提出了LT-D* Lite算法.该文采用电子海图水深叠加潮汐水位构建动态水深模型,同时建立水深危险度代价函数对最优安全节点进行选择,平衡路径的安全性.算法在拓展节点过程引入视线检查算法,将节点拓展方式从八邻域拓展为任意角度方式并使路径平滑,通过动态水深调整后的浅水区域进行路径调整.仿真实验表明,该文所提出的算法具有规划路径短且路径平滑的特点,同时可引导无人艇避开浅水深区域,显著降低路径危险度.