Applied Mechanics and Materials Vols. 333-335

Abstract: The paper introduced the application of laser tracker in the 3D alignment and installation of accelerator. USMN(Unified Spatial Metrology Network) in the SA(SpatialAnalyzer, a software) was used to solve 3D control-survey network in l00m scale, the tracker with SA can measure data and check results for fiducialization, guide the magnets installation and best-fit smoothing orbit. SA made the data stream consistent and reliable, and final the accuracy of 0.15mm transverse over 10m distance. this method also can be used in the installation of great science facility.

Abstract: This paper gives a research on characteristic of fluctuating pressure, using different kinds of pressure Tubes to research. And this paper researches on how to use different restrictors in different tube systems to obtain the regulation of fluctuating pressure in the pressure Tube. This paper also gives the measurement result of delay time in different tube systems.

Abstract: With the maturity of mobile Internet technology, the mobile terminal performance improves continually. Real-time and mobility in measurement system will become an inevitable trend . To solve the poor generality and mobility problem of traditional measurement system,this paper will combine reconfigurable virtual instrument technology and mobile Internet technology, develop a set of reconfigurable measurement instrument platform to adapt to the mobile devices (mobile phones, tablet PCs, etc) characteristic by using Eclipse software, which enable the wireless interactive operation and measurement data real-time detection, meet the demand of various measurement tasks as well as enhance the system scalability. At last, through building measurement instrument platform of wireless weighing to realize the instrument system online reconstruction.

Abstract: We carefully investigate the effect of cavity field quantum state on the quantum entanglement and supercurrent dynamical behaviors of coupling superconducting qubits in circuit QED system. The results show that not only the time-evolving dynamics of entanglement exhibit collapse and revival oscillation behaviors，but also that the single sideband envelope of current is almost similar with the time-evolving curve of entanglement.

Abstract: Cantilever CMM(short for coordinate measuring machine) is non-orthogonal type one with large measurement range, small volume, light weight, low cost, but lower precision. Error calibration and compensation is an important way to improve the measurement accuracy . This paper presents a new calibration method for the length of articulated arm just using the square. Facility requirement is relatively low and it is easy to operate. Comparing with that measured by laser interferometer, this method has a relatively high accuracy, having a certain value in practical measurement.

Abstract: This paper obtained the surface reflectance image by using FLAASH atmospheric correction model to conduct atmospheric correction to the HSI image. After the reflectance image was processed with multi mathematical manipulations, the analytical method of geographic information system (GIS) was applied to carry out the partial least squares regression (PLSR) analysis with the measured value of soil salinity, thus quantitatively inverting the soil salinity in Songliao Plain. The research result indicated that the reflectance of HSI hyperspectral imaging can increase the related coefficient R² of salt content in saline alkali soil significantly after being processed with reciprocal (1/R) and first-order differentiation (R), reaching 0.818 and 0.851 respectively with a root mean square error (RMSE) of 0.77 and 0.694 respectively, quantitatively and quickly gaining the soil salinity in Songliao Plain as well as salinization prevention.

Abstract: The sudden jump in position data will limit the application of single GPS in precision positioning field. In this paper, a simple real-time method to remove GPS position jump was presented. The result of the static test and kinematical test show that the method was effective on removing the position jump and highlight the short-term positioning precision of single GPS. Besides, it has little computational load and easy to be implemented real time.

Abstract: Because of the influence of elevation, Surface observation distance and reference ellipsoid distance is not equal, Resulting in length deformation, The size of the deformation is caused by elevation, In order to meet the requirements of measurement accuracy, It must be controlled within a certain range. In this paper, through establishing measuring reference, realized coordinates transformation in the national reference, it is very effective to control length deformation which is caused by elevation, at the same time, The relative position of survey area is unchanged in the national coordinate system

Abstract: We introduced an extension of traditional geodesic. Local neighbourhood of smooth curve on manifold shows good propositions which make it possible to construct a geodesic mapping from the neighbourhood to a rectangular district of UV-plane. Length of subsurface extended from smooth curve is defined according to the parameterization induced by geodesic mapping. And extended geodesic is the curve with minimal length of subsurface it extends. We also proposed a constrained mass-spring based approach to solve extended geodesic on discrete mesh. Experimental result shows that it is a high precision approximation for problems of measurement where the path can not be reduced as a single curve.

Abstract: For the multi-station positioning system in the field of underwater acoustics engineering, different geometric layout means different location precision. The location precision of the system was analyzed. The location precisions of several typical distributions were simulated, and the optimal form of distribution was provided. The rhombus distribution and the Y distribution are two optimal distributions.