网络地震谣言监测系统的设计和应用

介绍了一种网络地震谣言监测系统原理,设计思路和应用情况。针对目前互联网上地震谣言频发却又难以及时检测到的问题,用软件方式取代原有的人工监视模式,实现了对网络地震谣言的全天候、高效率的监测。结合网络爬虫和知识库等技术,根据特定的匹配条件对设定范围的网址进行周期性检查,一旦发现疑似谣言信息就以短信和屏幕弹窗方式向值班人员报警。     

一种用于海底类型聚类的新方法

By using sonar imaging, this paper presents a new algorithm for the clustering of seabed types based on the self-organizing feature maps （SOFM） neural network. The theory as well as data processing is studied in detail. Some valuable conclusions and suggestions are given     

A Directed-Line-Segment-Based Photogrammetry Method to Survey the Tunneling Working Surface of Mine Roadway

Absolute orientation is a basic technical work in digital image geologic logging of underground coal mine. Traditional control-point-based absolute orientation method requires setting object space control points of the known three-dimensional coordinates, which may lead to low efficiency. Therefore, this paper proposed a point-free close-range photogrammetry absolute orientation algorithm, which utilized direction line segments including plumb line segments and line segments with known directions and lengths to identify the dimensional orientation of a stereoscopic model. Experiment results show that the precision of the orientation results is favorable. σ _X and σ _Y are as high as 0.5 mm, and σ _Z is 0.3 mm. Finally, this paper introduced the application of the proposed algorithm in rapid geological logging of coal mine roadway, which was fast and reliable, convenient and feasible.     

准噶尔盆地车排子凸起新近系“网毯式”成藏机制剖析及其对盆地油气勘探的启示

与油气通常近源聚集不同,准噶尔盆地西部车排子凸起新近系为特殊的远源成藏.其成藏的机制是什么?是否具有普遍性?如何进行勘探?本文从其充注特征和输导体系人手,剖析了成藏机制与富集特征,进而系统描述评价了准噶尔盆地宏观输导格架,预测此类油气藏的勘探潜力与有利方向.研究表明,车排子凸起新近系远源成藏是”网毯式”体系高效输导的结果,准噶尔盆地多期构造运动与”砂-泥二元结构”沉积背景促使普遍发育网毯式输导体系.网毯输导体系控制了准噶尔盆地50％以上数量的油气聚集,网毯式成藏是盆地内一种非常重要的成藏类型.毯-源关系表现为侧向或纵向直接沟通样式、断层沟通或接力样式、断层-中转层接力样式、断层-不整合接力样式等4种样式.分析毯-藏空间关系,存在毯边、毯尖、毯中削截、毯中背斜、毯中坡折、毯中断块、毯上断块、毯上岩性、毯上地层等9种毯砂油气藏与毯上相关油气藏类型.准噶尔盆地网毯式油气藏具有很大的勘探潜力,应重视并采取以网毯输导体系刻画评价为核心的研究与部署思路,大力推进此种类型油气藏的勘探.     

贺兰山群变质杂岩主期变质作用的温压环境研究

分布于贺兰山脉北部的贺兰山群变质杂岩的主期变质作用达角闪麻粒岩相,其矿物组合特征与低压相系麻粒岩相似、利用共生矿物组合和矿物对的温度计、压力计估算主期变质温度740—764(?),压力460—501MPa。温度压力条件与低压相系的地热梯度线较接近,变质作用强度具面型分布的特征,与东部密云、冀东等地的麻粒岩相区相似,但变质压力明显低,压力类型也不同,应属不同构造背景下的变质产物。     

Real-time envelope cross-correlation detector: application to induced seismicity in the Insheim and Landau deep geothermal reservoirs

We develop and test a real-time envelope cross-correlation detector for use in seismic response plans to mitigate hazard of induced seismicity. The incoming seismological data are cross-correlated in real-time with a set of previously recorded master events. For robustness against small changes in the earthquake source locations or in the focal mechanisms we cross-correlate the envelopes of the seismograms rather than the seismograms themselves. Two sequenced detection conditions are implemented: After passing a single trace cross-correlation condition, a network cross-correlation is calculated taking amplitude ratios between stations into account. Besides detecting the earthquake and assigning it to the respective reservoir, real-time magnitudes are important for seismic response plans. We estimate the magnitudes of induced microseismicity using the relative amplitudes between master event and detected event. The real-time detector is implemented as a SeisComP3 module. We carry out offline and online performance tests using seismic monitoring data of the Insheim and Landau geothermal power plants (Upper Rhine Graben, Germany), also including blasts from a nearby quarry. The comparison of the automatic real-time catalogue with a manually processed catalogue shows, that with the implemented parameters events are always correctly assigned to the respective reservoir (4 km distance between reservoirs) or the quarry (8 km and 10 km distance, respectively, from the reservoirs). The real-time catalogue achieves a magnitude of completeness around 0.0. Four per cent of the events assigned to the Insheim reservoir and zero per cent of the Landau events are misdetections. All wrong detections are local tectonic events, whereas none are caused by seismic noise.     

Allowed Quantity of Explosive Charge Depending on the Distance from the Blast

This paper analyses results of trial, construction and quarry blasting, carried out in sediment rock deposits, mainly limestone and dolomite. Based on results of seismic measurements and engineering geological observations in sedimentary formation, an empirical relationship was established between ground vibration and geological strength index (GSI). The charge weight of explosive that may be detonated per delay for any given distance of nearby structures from the blast is approximately determined by using the concept of the scaled distance (SD) along with the DIN 4150 standard.     

武汉城市圈城乡关联度分析

城乡关系是以流为载体的社会大系统中的两个子系统之间的相互关系,反映了城市与乡村区域的动态演变过程,是影响区域发展的重要因子;城乡关联是城市与乡村地域相互作用的表现形式,对区域发展具有制约性影响,探讨城乡关联度对促进区域一体化与区域协调发展具有重要战略意义。在现状分析的基础上,用主成分分析法分析了武汉城市圈城乡关联度,从产业转移与产业链构建、现代农业发展、区域公共服务体系、基础设施一体化等方面提出了促进武汉城市圈城乡关联与协调发展的主要对策。     

New insights into rare earth element (REE) particulate generated by cigarette lighters: an electron microscopy and materials science investigation of a poorly understood indoor air pollutant and constraints for urban geochemistry

Cigarette smoking is a well-recognized cause of lung cancer and other diseases and is a major contributor to indoor air pollution in numerous settings worldwide. Most cigarette lighters use rare earth element (REE) mischmetal in their flints in order to aid ignition, and these lighters thus have pyrophoric properties. REE particulate emitted from these lighters presents a complexity in the role of health of smokers that has yet to be explored fully. Furthermore, these particles are likely present in numerous urban settings and contribute to the complexities of urban geochemistry. Details of the material properties of rare earth element (REE) particulate derived from smoking lighters are determined first the first time. Particulate was investigated using back-scatter detection scanning electron microscopy techniques and transmission electron microscopy techniques. Several particle types were observed and demonstrate a diverse range of size and textures, many of which are previously not documented and are much smaller than previous basic scanning electron microscopy investigations. These include irregularly shaped fragments of mischmetal, micrometer-scale spherules, aggregates of nanospherules, and platy sponge-like nanoparticles. All of these particles have significant REE content, and most are of a particle size that can be deposited deep in the lung. The available literature regarding toxicity of REEs and the material science data presented here argues very strongly for cause for concern.     

GPS/BDS/GLONASS/Galileo多系统融合在中国区域的仿真分析

通过STK软件对GPS、BDS、GLONASS、Galileo四个系统的星座结构进行仿真,并选择单系统与多系统组合定位的方式对中国区域内的可见卫星数、GDOP值和定位精度进行覆盖分析。结果表明,GPS/BDS/GLONASS/Galileo四系统组合定位在我国的GDOP值可达0.7~0.8,定位精度可达3~4m,优于其他方式的组合定位;同时四系统组合定位下的GDOP值降低,定位精度更好,GDOP值与定位精度的波动异常得到了抑制,导航定位的性能与稳定性也得到了相应的提升。