利用波动参数检测路基施工质量的试验研究   总被引：4，自引：2，他引：2  

李辉孙进忠  梁向前王园 《工程地质学报》2004,12(2):221-224

现有路基工程质量检测方法直观可靠 ,但也有费工、费时、成本高的问题 ,因此只能在有限的测点上对路基进行检测 ,难以连续全面地反映路基的质量。为克服这一问题 ,本文对碎石路基填料的夯实程度与弹性波速的关系进行了试验研究 ,从而为利用波动参数对路基的施工质量进行检测奠定了基础。在此基础上 ,应用波动方法 ,有望对路基工程质量进行连续全面的检测  相似文献   

北京晓幼营板理化岩体结构面强度的原位测试     

李元霞  孙进忠  杜明性  田爱苹  郑卫锋 《工程地质学报》2011,19(1):129-136

岩体强度很大程度上取决于结构面的强度,板理化岩体尤其如此.通过原位测试直接获得岩体结构面的强度参数对于岩体稳定性分析和工程设计都具有重要意义.为了解板理化岩体板理结构面的强度性质,选择北京房山区晓幼营白云质板理化岩体进行了结构面强度的原位测试研究.鉴于传统岩体原位直剪试验成本高和操作难的情况,在掌握北京地区构造应力资料...  相似文献   

摆镜平台寿命试验     

王景宇  戴妍峰  姜爱民 《天文研究与技术》2014,(4):410-416

摆镜平台是大口径空间天文望远镜图像稳定控制系统中的一个活动部件,为评估其寿命,设计和实现了摆镜平台寿命试验系统,并进行了摆镜平台寿命试验,得到了初步的试验结果.分析了摆镜平台所处的空间环境和工作条件,给出了摆镜平台驱动信号的产生方法和试验加速方法.在分析摆镜平台位移特性的基础上,给出了试验数据的处理方法和失效准则.初步试验的结果表明,摆镜平台在一年的时间里运行正常,在加速因子为5.5的情况下,等效摆镜平台已在卫星上正常工作五年半.  相似文献   

岩溶热储井间连通性的示踪研究   总被引：3，自引：0，他引：3       下载免费PDF全文

庞菊梅  庞忠和  孔彦龙  罗璐  王迎春  王树芳 《地质科学》2014,(3):915-923

岩溶热储储层的不均匀性强,采灌井之间的连通性不易确定。示踪技术可以将运移参数量化,有效刻画储层流体的特征,研究回灌井和开采井之间的水力联系,包括导水通道,流体流速等信息,对长期回灌可能引起的开采井的冷却进行预测,是岩溶热储井间连通性研究十分有效的技术。本文以华北牛驼镇地热田雄县地区为例,针对蓟县系雾迷山组岩溶热储,采用荧光素钠示踪剂,进行了1口井注入,10口井观测的群井示踪试验。采用裂隙介质溶质运移模型,对示踪试验数据进行了解释,得到优势通道的长度、渗透流速、纵向弥散度、回收率等储层性质,获得了试验区内采灌井之间的连通特征。对调整采灌井布局提出了建议。  相似文献   

Effects of the size of the test dose on the SAR protocol for quartz optically stimulated luminescence dating of loess in the eastern Tibetan Plateau     

《Quaternary Geochronology》2022

Dating of quartz by optically stimulated luminescence (OSL) has been revolutionized with introduction of the test dose (TD) in development of a measurement sequence known as the single-aliquot regenerative-dose (SAR), whereby a valid sensitivity correction for the luminescence signal is provided in the measurement cycle. However, the size of the TD used in the SAR protocol remains controversial. Previous studies show that the TD has little effect on the equivalent dose (D_e) for young samples in luminescence dating in which the applicability of different deposits varies greatly in different regions. However, detailed studies are lacking on how TD size affects SAR–OSL results of samples with a relatively high D_e range. In this study, typical loess samples with high D_e values (∼60 Gy–∼250 Gy) from the eastern Tibetan Plateau were selected to investigate the effects of variation in TD size on the quartz SAR–OSL protocol. Dose recovery tests show that a known dose could be recovered successfully by applying different TDs. Test dose size has an effect on shapes of regenerated dose–response curves (DRCs) and has different influences on D_es and characteristic saturation doses for quartz samples with a high dose range. A TD size of 20%–30% D_e is a good compromise for Tibetan loess with D_e of ∼60–120 Gy in the quartz SAR protocol, and a TD size larger than 30% should be considered for samples with a larger D_e. The results of this study highlight the importance of TD size in the SAR–OSL protocol for quartz samples with a high dose range.  相似文献   

The distributions of, and relationship between, He and nitrate in eddies     

W.J. Jenkins  D.J. McGillicuddy Jr.  D.E. Lott III 《Deep Sea Research Part II: Topical Studies in Oceanography》2008,55(10-13):1389

We present and discuss the distribution of ³He and its relationship to nutrients in two eddies (cyclone C1 and anticyclone A4) with a view towards examining eddy-related mechanisms whereby nutrients are transported from the upper 200–300 m into the euphotic zone of the Sargasso Sea. The different behavior of these tracers in the euphotic zone results in changes in their distributions and relationships that may provide important clues as to the nature of physical and biological processes involved.The cyclonic eddy (C1) is characterized by substantial ³He excesses within the euphotic zone. The distribution of this excess ³He is strongly suggestive of both past and recent ongoing deep-water injection into the euphotic zone. Crude mass balance calculations suggest that an average of approximately 1.4±0.7 mol m⁻² of nitrate has been introduced into the euphotic zone of eddy C1, consistent with the integrated apparent oxygen utilization anomaly in the aphotic zone below. The ³He–NO₃ relationship within the eddy deviates substantially from the linear thermocline trend, suggestive of incomplete drawdown of nutrients and/or substantial mixing between euphotic and aphotic zone waters.Anticyclone (A4) displays a simpler ³He–NO₃ relationship, but is relatively impoverished in euphotic zone excess ³He. We suggest that because of the relatively strong upwelling and lateral divergence of water the residence time of upwelled ³He is relatively short within the euphotic zone of this eddy. An estimate of the recently upwelled nutrient inventory, based on the excess ³He observed in A4's lower euphotic zone, is stoichiometrically consistent with the oxygen maximum observed in the euphotic zone.  相似文献   

全息测量接收机系统     

王锦清  梁世光  王鹏  范庆元  虞林峰  苟伟  夏博  蒋甬斌  肖英  高辽荣  胡阿丽 《云南天文台台刊》2011,(3):242-247

简单介绍了微波全息测量的原理、用于微波全息测量的接收机系统,然后比较详细地叙述了对该接收机系统相位稳定性的测试,指出了当前接收系统的主要问题。并对接收系统的改进做了两种设计方案。  相似文献   

行间转移CCD数字系统的VHDL设计     

和琳  李彬华  尚媛园  金建辉 《天文研究与技术》2011,(4)

首先分析了KAI-04022行间转移面阵CCD以及模拟前端信号处理器AD9845B的工作原理及控制要求;重点介绍了在QUARTUS 8.0的开发环境下,使用VHDL语言与FPGA器件对此图像采集系统的数字控制部分进行的分析与设计过程,并给出了系统仿真波形图。最后对硬件电路进行了测试,给出了主要输出端口的实测波形,并对仿真与实测波形进行了比较与分析。  相似文献   

国外航空地球物理试验场建设启示     

朱卫平  熊盛青  刘英会  张婉 《物探与化探》2012,36(4):637-640

在国家863重大计划项目的支持下,开展了我国航空地球物理试验场建设和研究工作。为此,开展了对国外航空地球物理试验场建设情况的调研,详细总结了加拿大安大略湖Reid-Mahaffy航空电磁地球物理试验场选场条件、建设方案以及试验场应用等情况,为我国航空地球物理试验场建设提供了重要启示。  相似文献   

在GIS软件中的拓扑关系及判定法则     

史与正  蒋卫国等 《湖南地质》2001,20(4):309-312,315

地理信息系统,在地理空间信息和数据库属性数据的管理中的地位和作用越来越明显,数字地图是GIS输入、输出的主要形式,数字地图通过内业矢量化或全野外采集的方式形成后,数据的关系依靠拓扑技术进行处理。论述了数据中点、线、面之间的关系,制定判定法则,判定它们的拓扑关系或添加一定的关系,使大量杂乱无章的数据建立或转换成另一种拓扑关系以达到处理信息的目的。特别就“交点计数检验法”进行了完善,保证了各种特殊情况处理方法的正确性。根据判别规则和方法,可以实现“缓冲区分析”、“自动裁剪线”、“自动形成封闭面”等拓扑处理功能。  相似文献