Applied Mechanics and Materials Vols. 170-173

Abstract: In Anti-de Sitter space-time, we develop the Parikh-Wilczek’s semi-classical quantum tunneling method to investigate the Hawking radiation of the charged massive particle via tunneling from a plane symmetry black hole. The result shows that, when taking self-gravitation interaction into account, the tunneling rate of the charged massive particle is related to the change of Bekenstein-Hawking entropy, and that the exact emission spectrum is not strictly pure thermal, but is consistent with the underlying unitary theory.

Abstract: This paper introduces the basic features and the performance of reflectorless total station. The ranging performance of Sanding KTS750R reflectorless total station is tested through lots of experiments in many ways under the condition of reflectorless, including the reflecting targets with different material property and different color, ranging in different angle of incidence different distance but also on detail point acquisition precision was analyzed., the performance index and application of reflectorless total station was evaluated in different conditions, some useful conclusions were drawn.

Abstract: Digital Cadastral is direct application results of digital mapping technology to cadastral surveying, which could enter cadastral management system directly to accomplish city digital cadastral databases to meet needs of information-based cadastral management and digital city. With discussion of common method and technology of digital mapping, system configuration and working mode of digital mapping system were presented firstly, and then concerned contents such as survey instruments, observation methods, data collection patterns and mapping software etc. were explored. Aiming at three widely used field digital mapping methods, working pattern and mapping mode of coding mapping method, sketch mapping method and electronic plate mapping method were compared, and then surveying precision, work efficiency and existing problems were analyzed. Subsequently, concrete working flow of digital Cadastral Surveying was layout. In the end, some corresponding conclusions were gained consequently and future development trend expectation was proposed.

Abstract: Measuring area of irregular shapes is essential for many applications in Geomatics engineering, Civil engineering, Agricultural sciences, and Medical sciences. In this era of digital images, a problem frequently encountered, when it is required to determine the area of irregular shapes such as irregular properties, contour lines, a parcel of land, drainage basins, lakes, ponds, wounds and tumors in human organs, swimming pools, and so on. This paper addresses this problem, and aims at developing a semi-automatic method that can be used as a software tool for area measurement of irregular shapes in digital images. The developed method is relatively straightforward and based on the raster image in which each spatial location has a pixel associated with it, and by definition each pixel will occupy a certain amount of area. The algorithm used in this method is based on spatial data in form of pixel coordinates. The algorithm is implemented in a computerized model developed in Microsoft Windows Visual C++6, and was equipped with Graphical User Interface (GUI) to friendly enable users to enter the required parameters. The experiment results using various sources of raster data, including satellite images, scanned map, medical images, and CAD drawings show that the developed software tool named (Area_IrreShape) is found to be effective, portable, easy to use, and accurate. However the cell size or the spatial resolution of the raster image is a key factor for the accuracy of measuring area by the developed software tool, and as such the accuracy increases as the size of the cell decreases. Finally, it can be concluded that the semi-automatic method developed in this paper is ideal for many applications for irregular or regular shapes, particularly where precise area measurement of large irregular two dimensional shapes in digital images is needed.

Abstract: In this paper, it is proved that the principle of level surveying is uncertainty, formula of level surveying varies with selection of horizontal surface and level surface, formula of level surveying doesn’t vary with placement of level, and the principle formula of level surveying of college surveying is explained reasonably. Finally, I advise to study all results of humans level surveying based on my paper to find some new and exciting results.

Abstract: In this paper, a reverse of Hardy-Hilbert type inequalities with a best constant factor is given by introducing two parameters.

Abstract: Construction of large steel structure is the key point of the whole National Stadium “Bird's Nest” project, while construction of main truss is the core of the whole steel structure construction. As connection of main trusses will be carried out overhead, the positioning survey work is quite difficult. This paper introduces the construction survey work of main truss.

Abstract: In the process of urbanization, along with a high degree of integration of the intensification of land use and urban architecture function, many large-scale large buildings have appeared which have enormous architectural space and the structure is complex. They are the city's landmarks and are the import integration of urban functions and landscape. During the construction of complex steel structure the high altitude installation need high demand to control surveying. It requires not only the surveying accuracy, precision, but also high surveying techniques on the spatial structure of three-dimensional positioning, docking, and assembly. Conventional planar and high level processing surveying mode cannot meet the construction needs. In this paper the arched surface steel roof truss high altitude installation project of China Tianjin West Railway Station is researched which has north-south length of 394 meters and east to west span 126 meters. The research aims to establish an accuracy of high three-dimensional surveying control network. This paper presents a specific implementation method of control surveying. And though data processing, accuracy evaluation and the analysis of engineering applications results, we verify the correctness of the method. This method support spatial location and geometric characteristics for arched surface of steel roof truss high attitude installation. It ensures the project successfully implemented.

Abstract: For needs of transportation, it is more and more obvious of the bridge unsafe, and the study of bridge safety monitor will become more important at the area of civil engineering. In this paper we discuss the methods of digital ground photogrammetry for bridge safety monitoring and the application of those, we took digital cameras and 3-D laser scanners as the tools for close-range photogrammetry, and adopted 3D Time Baseline Parallax combined with Kalman Variance Filters as the theories for monitoring dynamic deformation, then developed software to deal with data, which can draw curves of dynamic deformation automatically, we can monitor the deformation regularity by these curves effectively, then we can monitor and analysis the safety of bridges by this way. The method we designed is very simple and economical, and we also did a lot of experiments to verify availability of this system, and we happy to say that the system has the characteristics of high automation degree, large data collection capacity and strong system reliability, etc. It will be practical value at the area of civil engineering.

Abstract: This article first selects the seven kinds of fabric to observe fabrics for cobalt chloride drying, moisture absorption color from blue to pink change processes, and in 0 minutes to 30 minutes seven time taking pictures of fabric. Photos of extracting the spectral photometry instrument of reflectance as the characteristic value, also measured the seven fabric static physics index, and then the reflectivity of fabric and static physical indexes of the partial correlation analysis. The results show that when Controlling the moisture content, partial correlation coefficient of the reflectivity and thermal resistance is the highest, about 0.916, the second is when the moisture vapor transmission control, partial correlation coefficient of the thickness and the reflectivity is 0.884; The moisture content and moisture vapor transmission rate, air rate and reflectivity also has certain relations, core suck height and reflectivity does not exist partial correlation relationship.