排序方式： 共有60条查询结果，搜索用时 31 毫秒
11.
时空大数据背景下并行数据处理分析挖掘的进展及趋势 总被引：3，自引：3，他引：0
随着互联网、物联网和云计算的高速发展,与时间、空间相关的数据呈现出“爆炸式”增长的趋势,时空大数据时代已经来临。时空大数据除具备大数据典型的“4V”特性外,还具备丰富的语义特征和时空动态关联特性,已经成为地理学者分析自然地理环境、感知人类社会活动规律的重要资源。然而在具体研究应用中,传统数据处理和分析方法已无法满足时空大数据高效存取、实时处理、智能挖掘的性能需求。因此,时空大数据与高性能计算/云计算融合是必然的发展趋势。在此背景下,本文首先从大数据的起源出发,回顾了大数据概念的发展历程,以及时空大数据的特有特征;然后分析了时空大数据研究应用产生的性能需求,总结了底层平台软硬件的发展现状;进而重点从时空大数据的存储管理、时空分析和领域挖掘3个角度对并行化现状进行了总结,阐述了其中存在的问题;最后指出了时空大数据研究发展趋势。 相似文献
12.
钢管高性能混凝土压弯构件滞回性能试验研究 总被引：2，自引：1，他引：2
考虑钢材强度、混凝土强度、轴压比等参数，进行了18个钢管高性能混凝土试件的试验，分析在往复荷载作用下钢管高性能混凝土荷载-位移关系曲线的特点、构件的轴向变形和抗弯刚度退化情况，并初步探讨往复荷载作用下的钢管高性能混凝土压弯构件承载力。 相似文献
13.
目的：建立泻白散基准样品特征图谱方法,以LC-MS/MS指认各特征峰并对其进行归属,建立基准样品各组成药味质控指标的含量测定方法综合评价其质量。方法：以色谱柱Hypersil ODS2(250 mm×4.6 mm,5μm)、乙腈-0.1%磷酸/甲酸梯度洗脱、检测波长280nm、流速1.0 ml/min、柱温25℃、进样量10μl进行指纹图谱研究,以同一色谱条件使用LC-MS/MS联用进行峰归属并进行化学成分分析,以指认的各药味专属性峰建立基准样品质控指标含量测定方法。结果：泻白散基准样品特征图谱重复性良好,供试品溶液48 h内稳定,多批次检测显示泻白散指纹图谱共有峰14个,相似度均＞0.9;峰归属确认其中5个归属于炒桑白皮,5个归属于炙甘草,3个归属于地骨皮;并通过LC-MS/MS指认出其中11个色谱峰;选取桑皮苷A、甘草酸、枸杞素B分别建立含量测定方法,结果显示方法均具有专属性,重复性良好,加样回收率分别为94.9%、93.5%、95.2%。结论：该指纹图谱方法经验证可行,可有效鉴别泻白散三味饮片;结合LC-MS/MS成分分析可有效选取基准样品各药味的质控成分;建立的检测桑皮苷A、甘草酸、枸杞素B含量测定方法经方法学考察确认可行。 相似文献
14.
在河南省舞阳铁山矿区的勘察钻进中，采用液动潜孔锤钻进工艺解决了在倾角较大、软硬不均、互层频繁的条带状混合花岗岩地层中的钻探技术难题，提高了钻进效率，有效地防止了钻孔的偏斜。结合该工程实例介绍了液动潜孔锤钻进工艺以及所取得的效果。 相似文献
15.
蓄能式液动潜孔锤是一种反作用式潜孔锤,具有低能耗、小排量、大冲击功和高能量利用率的特点。以芯阀结构为例,介绍了蓄能式液动潜孔锤的结构特点及其工作原理,阐述了新型蓄能式液动潜孔锤的研制过程和技术优势,以及应用效果。指出了存在的问题和改进的建议。 相似文献
16.
Cloud computing has been considered as the next-generation computing platform with the potential to address the data and computing challenges in geosciences. However, only a limited number of geoscientists have been adapting this platform for their scientific research mainly due to two barriers: 1) selecting an appropriate cloud platform for a specific application could be challenging, as various cloud services are available and 2) existing general cloud platforms are not designed to support geoscience applications, algorithms and models. To tackle such barriers, this research aims to design a hybrid cloud computing (HCC) platform that can utilize and integrate the computing resources across different organizations to build a unified geospatial cloud computing platform. This platform can manage different types of underlying cloud infrastructure (e.g., private or public clouds), and enables geoscientists to test and leverage the cloud capabilities through a web interface. Additionally, the platform also provides different geospatial cloud services, such as workflow as a service, on the top of common cloud services (e.g., infrastructure as a service) provided by general cloud platforms. Therefore, geoscientists can easily create a model workflow by recruiting the needed models for a geospatial application or task on the fly. A HCC prototype is developed and dust storm simulation is used to demonstrate the capability and feasibility of such platform in facilitating geosciences by leveraging across-organization computing and model resources. 相似文献
17.
Spatial cloud computing: how can the geospatial sciences use and help shape cloud computing? 总被引：1，自引：0，他引：1
《International Journal of Digital Earth》2013,6(4):305-329
Abstract The geospatial sciences face grand information technology (IT) challenges in the twenty-first century: data intensity, computing intensity, concurrent access intensity and spatiotemporal intensity. These challenges require the readiness of a computing infrastructure that can: (1) better support discovery, access and utilization of data and data processing so as to relieve scientists and engineers of IT tasks and focus on scientific discoveries; (2) provide real-time IT resources to enable real-time applications, such as emergency response; (3) deal with access spikes; and (4) provide more reliable and scalable service for massive numbers of concurrent users to advance public knowledge. The emergence of cloud computing provides a potential solution with an elastic, on-demand computing platform to integrate – observation systems, parameter extracting algorithms, phenomena simulations, analytical visualization and decision support, and to provide social impact and user feedback – the essential elements of the geospatial sciences. We discuss the utilization of cloud computing to support the intensities of geospatial sciences by reporting from our investigations on how cloud computing could enable the geospatial sciences and how spatiotemporal principles, the kernel of the geospatial sciences, could be utilized to ensure the benefits of cloud computing. Four research examples are presented to analyze how to: (1) search, access and utilize geospatial data; (2) configure computing infrastructure to enable the computability of intensive simulation models; (3) disseminate and utilize research results for massive numbers of concurrent users; and (4) adopt spatiotemporal principles to support spatiotemporal intensive applications. The paper concludes with a discussion of opportunities and challenges for spatial cloud computing (SCC). 相似文献
18.
传统分布式水文模型采用串行计算模式,其计算能力无法满足大规模水文精细化、多要素、多过程耦合模拟的需求,亟需并行计算的支持。进入21世纪后,计算机技术的飞速发展和并行环境的逐步完善,为分布式水文模型并行计算提供了软硬件支撑。论文从并行环境、并行算法2个方面对已有研究进行总结概括,分析了不同并行环境和并行算法的优势与不足,并提出提高模型并行效率的手段,即合理分配进程/线程数缩减通信开销,采用混合并行环境增强模型可扩展性,空间或时空离散化提高模型的可并行性及动态分配计算任务、平衡工作负载等。最后,论文对高性能并行分布式模型的未来研究方向进行展望。 相似文献
19.
Zhaoyang CHAI He ZHANG Mulan ZHANG Xiao TANG Weipeng ZHENG Jiang ZHU Guangqing ZHOU Junji CAO Qingcun ZENG 《大气科学进展》2021,38(10):1611-1620
This article introduces "EarthLab ", a major new Earth system numerical simulation facility developed in China.EarthLab is a numerical simulation system for a physical climate system, an environmental system, an ecological system, a solid earth system, and a space weather system as a whole with a high-performance scientific computing platform.EarthLab consists of five key elements—namely: a global earth numerical simulation system, a regional high-precision simulation system, a supercomputing support and management system, a database, data assimilation and visualization system, and a high-performance computing system for earth sciences. EarthLab helps to study the atmosphere, hydrosphere,cryosphere, lithosphere, and biosphere, as well as their interactions, to improve the accuracy of predictions by integrating simulations and observations, and to provide a scientific foundation for major issues such as national disaster prevention and mitigation. The construction and operation of EarthLab will involve close cooperation with joint contributions and shared benefits. 相似文献
20.
消防射水对火灾后高性能混凝土剩余抗压强度的影响 总被引：1，自引：0，他引：1
对火灾后消防射水对高性能混凝土（HPC）剩余抗压强度的影响进行了研究。分析了在不同温度、不同冷却方式条件下,C40HPC剩余抗压强度的变化规律,并利用ORIGIN 7.5软件,拟合了高温作用后HPC剩余抗压强度与温度之间的关系。研究表明：消防射水对高温作用后的HPC的剩余抗压强度的影响很大,射水冷却后的HPC剩余抗压强度明显低于自然冷却后的剩余抗压强度;随着破坏温度的升高,经消防射水冷却的HPC剩余抗压强度呈衰减状态。最后,建立了自然冷却及消防射水冷却条件下,C40HPC剩余强度与火场温度之间的二元回归曲线公式。 相似文献