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预应力钢铰线张拉伸长量量测控制技术在桥梁工程中的应用研究
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作者 陆秀登 《交通世界》 2018年第21期100-101,共2页
首先对预应力钢铰线张拉伸长量量测控制技术在桥梁工程中的应用进行研究。然后针对目前桥梁工程中应用预应力钢绞线张拉伸长量量测控制技术过程存在的问题进行研究,以实际工程项目为例,对预应力钢铰线张拉伸长量量测控制技术在桥梁工程... 首先对预应力钢铰线张拉伸长量量测控制技术在桥梁工程中的应用进行研究。然后针对目前桥梁工程中应用预应力钢绞线张拉伸长量量测控制技术过程存在的问题进行研究,以实际工程项目为例,对预应力钢铰线张拉伸长量量测控制技术在桥梁工程中的应用要求进行分析。最后提出了相应的应用控制要点,其目的是为相关建设者提供一些理论依据。 展开更多
关键词 预应力钢铰线 张拉伸长 量测控制技术
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A Trusted Measurement Scheme Suitable for the Clients in the Trusted Network 被引量:3
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作者 GONG Bei ZHANG Jianbiao +1 位作者 YE Xiaolie SHEN Changxiang 《China Communications》 SCIE CSCD 2014年第4期143-153,共11页
The trusted network connection is a hot spot in trusted computing field and the trust measurement and access control technology are used to deal with network security threats in trusted network.But the trusted network... The trusted network connection is a hot spot in trusted computing field and the trust measurement and access control technology are used to deal with network security threats in trusted network.But the trusted network connection lacks fine-grained states and real-time measurement support for the client and the authentication mechanism is difficult to apply in the trusted network connection,it is easy to cause the loss of identity privacy.In order to solve the abovedescribed problems,this paper presents a trust measurement scheme suitable for clients in the trusted network,the scheme integrates the following attributes such as authentication mechanism,state measurement,and real-time state measurement and so on,and based on the authentication mechanism and the initial state measurement,the scheme uses the realtime state measurement as the core method to complete the trust measurement for the client.This scheme presented in this paper supports both static and dynamic measurements.Overall,the characteristics of this scheme such as fine granularity,dynamic,real-time state measurement make it possible to make more fine-grained security policy and therefore it overcomes inadequacies existing in the current trusted network connection. 展开更多
关键词 trusted computing trusted network AUTHENTICATION state measurement real-time measurement
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Volumetric measurement of rock movement using photogrammetry 被引量:2
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作者 Benton Donovan J. Iverson Stephen R. +2 位作者 Martin Lewis A. Johnson Jeffrey C. Raffaldi Michael J. 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2016年第1期123-130,共8页
NIOSH ground control safety research program at Spokane,Washington,is exploring applications of photogrammetry to rock mass and support monitoring. This paper describes two ways photogrammetric techniques are being us... NIOSH ground control safety research program at Spokane,Washington,is exploring applications of photogrammetry to rock mass and support monitoring. This paper describes two ways photogrammetric techniques are being used. First,photogrammetric data of laboratory testing is being used to correlate energy input and support deformation. This information can be used to infer remaining support toughness after ground deformation events. This technique is also demonstrated in a field application.Second,field photogrammetric data is compared to crackmeter data from a deep underground mine.Accuracies were found to average 8 mm,but have produced results within 0.2 mm of true displacement,as measured by crackmeters. Application of these techniques consists of monitoring overall fault activity by monitoring multiple points around the crackmeter. A case study is provided in which a crackmeter is clearly shown to have provided insufficient information regarding overall fault ground deformation.Photogrammetry is proving to be a useful ground monitoring tool due to its unobtrusiveness and ease of use. 展开更多
关键词 PhotogrammetryGround controlMonitoringDeep vein miningVolume calculationCrackmeter
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Rehabilitation Soils with Date Palm Mulching Treatments
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作者 Modi Ahmed A. M. Al-Dousari 《Journal of Agricultural Science and Technology(A)》 2018年第3期129-141,共13页
Kuwait is located in hyper arid desert environment. This geographical location and irrational human activities accelerate the expansion of land degradation problem. In order to rehabilitate the degraded areas it is ne... Kuwait is located in hyper arid desert environment. This geographical location and irrational human activities accelerate the expansion of land degradation problem. In order to rehabilitate the degraded areas it is necessary to use soil and water resources in sustainable manner. Owing to these reasons it is essential to use appropriate methods based on the scientific diagnostics of the problem. It is compulsory to identify, specify and test different efficient, cost-effective and environment friendly sound sustainable sand control measures such as, semi-circular bunds, square micro catchment and checker board palm leaves to rehabilitate degraded lands in Liyah refilled quarries. To evaluate the impact of rehabilitation method through mulching with date palm leaves soil samples were collected (control and rehabilitation sites with square micro catchment) prior to the implementation plan and post completion of the project (three years). In this study will be highlighted on detail the results of using square micro catchment and with short brief descriptions on other water harvesting techniques. The results showed an improvement of physical soil properties after the application of these techniques. Soil fertility increased through increasing the quantity of fine and very fine sand. The soil moisture at the surface soil increased from 0.085% to 1.62% after the treatment. The untreated soil has high bulk density about 2 g/cm3 and low porosity about 27%. However, after the soil was ploughed and mulched the bulk density decreased to 0.03 g/cm3. And porosity improved 98%. This study conserved the irrigation water through reducing the proportion of soil evaporation, in addition to the creation of optimum condition for plant growth. The aim of this study was to analyze the effect of using organic mulch date palm leaves with water harvesting techniques on the physical and biological properties of degraded soil in Liyah area. 展开更多
关键词 Control measures degraded lands REHABILITATION MULCHING
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Novel Technique of Radar Interferometry in Dynamic Control of Tall Slender Structures
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作者 Tomasz Owerko Lukasz Ortyl Rafal Kocierz Przemyslaw Kuras 《Journal of Civil Engineering and Architecture》 2012年第8期1007-1013,共7页
Structures of slender shape, like guyed masts, chimneys or TV towers, are exposed to the excitation of dynamic movements. The most common cause of vibration is the wind that reduces generation of vortices. Another imp... Structures of slender shape, like guyed masts, chimneys or TV towers, are exposed to the excitation of dynamic movements. The most common cause of vibration is the wind that reduces generation of vortices. Another important reason is a sudden strike from seismic or para-seismic forces. Structure exposed to wind impact is subjected to harmonically various force, perpendicular to the air stream, which is an effect of vortices, shedding on alternate sides of slructure. Because of the possibility of vibration the damping of a structure has to be designed. Measuring of decay in the oscillation allows to find the logarithmic decrement of the real structure and compare it with the designed value. Apart from damping, the proper designing of tall slender structures has to preserve the significant difference between vortex shedding frequencies and the natural frequencies of the structure shape modes. In the case of guyed masts it is important to analyse the response of a real structure to the exceptional dynamic load, such as a sudden break of guy or fall off a load from a structure, e.g., icing or antennas. The dynamic analysis of a real slructure requires the accurate values describing the dynamic behavior of tall structures (e.g., amplitudes). The accuracy of 0.1 mm is provided by ground-based interferometric radar. This device is a part of the IBIS-S (image by interferometric survey) system, which calculates the displacement values on the basis of the difference between phases of waves received in consecutive samples. Typically, the measurements of tall structures are performed with several sensors (strain gauges, accelerometers). Instead, the IBIS-S system allows the quasi-continuous (not limited to points) observation of the entire structure without installation of any sensors or reflectors. The real resolution (along the structure), which means the minimum distance between two observed points, amounts up to about 0.7 m, 展开更多
关键词 VIBRATION radar intefferometry frequency of vibration CHIMNEYS masts.
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Remote Measurement in Steel Grid Structure Based on Control Grid Network
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作者 YI Xiaodong YI Xuefeng WEI Erhu 《Geo-Spatial Information Science》 2009年第4期303-306,共4页
Based on a control grid network and in combination with a remote total station and digital camera,the distribution of steel nodes and deflection curve of a steel grid structure can be obtained easily.The measurement r... Based on a control grid network and in combination with a remote total station and digital camera,the distribution of steel nodes and deflection curve of a steel grid structure can be obtained easily.The measurement result shows that this method is effective and utilitarian. 展开更多
关键词 steel grid structure ball nodal point control grid network image coordinate 3D digital model
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