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测震仪器数据访问中间件的设计与应用 总被引：1，自引：0，他引：1
《地震地磁观测与研究》2015,(6)
分析几种地震数据采集器网络协议和数据格式,设计一种仪器数据访问中间件,为实现上位机应用程序与数采网络通信、多种数据流接收和发布,提供方法和工具。利用中间件开发测震仪器数据自动同步软件,实现地震台站参数和仪器健康状态的自动同步,在河北测震台网的成功应用证明了中间件的实用性。 相似文献
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受供电和数据传输方式的影响,十堰地震台测震系统数据断记时间较长,数据质量较差。为此,采用3路交流供电自动切换辅助2路直流供电方式,为仪器运行提供稳定的电力供给,并采用一主一备有线光纤传输解决微波单线传输的弊端。为验证解决措施的有效性,选取该台2009—2020年测震记录,统计SEED格式波形记录数据断记时长,结果发现,在2013年进行整改以来,数据断记现象减少,断记时长明显缩短。选取该台2015—2021年测震系统仪器更换以来的数据记录,分析地方震、近震、远震和极远震震相特征,发现该台记录地震波形清晰、可靠。可见,该台数据断记整改措施得到有效检验,测震系统运行质量得到提升,可为国内同类测震台站提供参考。 相似文献
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测震仪器健康状态数据交换平台的设计与实现 总被引：4，自引：0，他引：4
介绍了测震仪器健康状态数据交换软件平台的设计与实现.在软件开发过程中,主要使用了TCP/IP Socket编程、并发程序设计和JMS消息机制等关键技术,实现了与多种地震数据采集器的并发式网络通信以及健康状态数据的接收和交换.开源的消息中间件ActiveMQ作为统一交换平台,为仪器健康状态的交换共享提供了统一的数据接口,便于实现系统与新业务的无缝集成,提高了系统的弹性和可扩展性.利用本系统的框架模式开发的测震台站远程监视系统在河北测震台网得到了成功的应用,其功能和性能均达到了设计预期效果. 相似文献
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使用Ultra-NMS监控软件扩展测震仪器监控功能的方法 总被引：1，自引：1，他引：0
Ultra-NMS是中国地震局统一采购的监控和网管平台,通过开发测震数据LISS服务器接口,可以监控台站测震数据状态指标,丰富 Ultral-NMS 对测震仪器的监控功能,同时以动态监控方式将统计好的指标绘制在监控软件的视窗上,为实现测震运行异常监控提供了有效的判断方法。 相似文献
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Gtz Schroth Luciana Ferreira Da Silva Marc‐Andree Wolf Wenceslau Geraldes Teixeira Wolfgang Zech 《水文研究》1999,13(10):1423-1436
The partitioning of rain water into throughfall, stemflow and interception loss when passing through plant canopies depends on properties of the respective plant species, such as leaf area and branch angles. In heterogeneous vegetation, such as tropical forest or polycultural systems, the presence of different plant species may consequently result in a mosaic of situations with respect to quantity and quality of water inputs into the soil. As these processes influence not only the water availability for the plants, but also water infiltration and nutrient leaching, the understanding of plant effects on the repartitioning of rain water may help in the optimization of land use systems and management practices. We measured throughfall and stemflow in a perennial polyculture (multi‐strata agroforestry), monocultures of peach palm (Bactris gasipaes) for fruit and for palmito, a monoculture of cupuaçu (Theobroma grandiflorum), spontaneous fallow and primary forest during one year in central Amazonia, Brazil. The effect on rain water partitioning was measured separately for four useful tree species in the polyculture and for two tree species in the primary forest. Throughfall at two stem distances, and stemflow, differed significantly between tree species, resulting in pronounced spatial patterns of water input into the soil in the polyculture system. For two tree species, peach palm for fruit (Bactris gasipaes) and Brazil nut trees (Bertholletia excelsa), the water input into the soil near the stem was significantly higher than the open‐area rainfall. This could lead to increased nutrient leaching when fertilizer is applied close to the stem of these trees. In the primary forest, such spatial patterns could also be detected, with significantly higher water input near a palm (Oenocarpus bacaba) than near a dicotyledonous tree species (Eschweilera sp.). Interception losses were 6·4% in the polyculture, 13·9 and 12·3% in the peach palm monocultures for fruit and for palmito, respectively, 0·5% in the cupuaçu monoculture and 3·1% in the fallow. With more than 20% of the open‐area rainfall, the highest stemflow contributions to the water input into the soil were measured in the palm monocultures and in the fallow. Copyright © 1999 John Wiley & Sons, Ltd. 相似文献
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M. N. French R. L. Bras W. F. Krajewski 《Stochastic Environmental Research and Risk Assessment (SERRA)》1992,6(1):27-45
A procedure for short-term rainfall forecasting in real-time is developed and a study of the role of sampling on forecast ability is conducted. Ground level rainfall fields are forecasted using a stochastic space-time rainfall model in state-space form. Updating of the rainfall field in real-time is accomplished using a distributed parameter Kalman filter to optimally combine measurement information and forecast model estimates. The influence of sampling density on forecast accuracy is evaluated using a series of a simulated rainfall events generated with the same stochastic rainfall model. Sampling was conducted at five different network spatial densities. The results quantify the influence of sampling network density on real-time rainfall field forecasting. Statistical analyses of the rainfall field residuals illustrate improvement in one hour lead time forecasts at higher measurement densities. 相似文献
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M. A. Kahn 《洁净——土壤、空气、水》2000,28(2):95-101
Red tide, a recurrent phenomenon has become conspicuous in several Kashmir lake ecosystems since 1991. The responsible organism (Euglena pedunculata), a rare flagellate rediscovered in the Kashmir Himalaya (Khan 1993) caused first and unprecedented red tide outbreak, constituting a maximum of 96% of resident numerical phytoplankton density in Dal Lake. At present, conflicting hypotheses exist on the generation of causal assemblage(s) imparting redness to waters: Jeeji Bai (1991) linked its origin to acid precipitation – a fallout of burning oil‐fields during the Gulf War – whilst Khan (1993) holds local factor(s) responsible. Field/experimental studies support the latter contention that the influx of untreated sewage, in unison with warm temperatures, high levels of PhAR, iron and interruption to hydrological flow‐pattern together with absence/or reduction in grazing activity created conducive environmental milieu for red tide outbreak. Dal Lake “red tide” drifted the bloom‐inoculum to other waters, including Lake Wular, where additional ecological niches were carved out, threatening the aesthetic value and biological diversity of Kashmir lakes. Ecological monitoring indicates frequent seasonal red tide occurrence in Dal Lake (including summer‐autumn event of 1998) which testifies its unabated eutrophication status. Further studies are needed on ecological adaptability and biogeographic distribution of this rare and unique red tide‐causing flagellate. 相似文献
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