Advanced Materials Research Vol. 787

Abstract: The effective measures to solve the urban traffic problem is the development of urban rail transit, but its ambient noise and vibration problems have prompted a strong reaction, restricting the development of rail transport undertakings. Observations on Beijing rail traffic of the 13th line Huoying-Huilongguan segment of vibration signals analysis, and we can get the Empirical Mode Decomposition (EMD) of the measured vibration signals through the HHT method, we also can analysis of the Hilbert-Huang time-frequency spectrum, the marginal energy spectrum and the instantaneous energy spectrum. Study the propagation of vibration along the ground, in order to predict the vibration level along the track. Though the analysis we find that the vertical vibration level is much higher than the level of vibration, the analysis should be mainly based on vertical vibration, the environmental vibration level is gradually attenuated with the increasing of the distance away from the track centerline.

Abstract: In order to investigate acoustic radiation characteristics of underwater pyrotechnic combustion, Hartmann acoustic generator was applied and its main structural parameters effecting acoustic radiation characteristics were studied by using underwater acoustic measurement system. Experimental studies have shown that, when Hartmann acoustic generator was applied, the sound pressure level of underwater pyrotechnic combustion increased significantly because of the strengthening of turbulence degree. The distance between the nozzle and the resonant cavity is an important factor of affecting acoustic radiation characteristics of Hartmann acoustic generator. When the resonant cavity was placed in the unstable pressure area, it could stimulate strong sound waves. On account of the resistance of the water, the combustion products speed of reaching resonant cavity drooped and the collision strength between the feedback combustion products and the newly generated products reduced. So when the distance was larger, the SPL(sound pressure level) was smaller. The SPL of underwater pyrotechnic combustion increased and the acoustic frequency moved to the low frequency with the depth of resonant cavity increased, which is consistent with the acoustic characteristics of Hartmann acoustic generator applied in air.

Abstract: Constantly use combined tubing string to meet the strengths requirement during oil production and worover job. The maximum setting depth of combination tubing string is relevant to well deviation, casing program, fluid level, as well as tubings material, size, collapsing strength, internal-outer pressure resistance and floatage of holebore fluid. Based on mechanics analysis and mathematical development, obtained mathematical relation which can meet requirement of different combined tubing string, and described relation of conventional tubing string composition length, it can be used for tubing string strengths checking.

Abstract: By using the data of core, geological log and seism and the theory of sedimentology and sequence stratigraphy , the sequence of Shahezi formation in Xujiaweizi depression are divided into five third-order sequence, they are SQ1, SQ2, SQ3, SQ4 and SQ5 up towards. The range of SQ1 is limited, influenced by palaeogeomorphology. SQ5 are greatly influenced by the late sedimentary denudation, now only in the northwest of the study area can be seen, other part is missing in this layer. SQ1, SQ2, SQ3 are onlap filled. There are defective area in SQ4 and SQ5.

Abstract: This work is a study of coupled charges and heat transfers phenomena on a low temperature PEMFC single cell. A one-dimensional steady state model was developed to compute current and temperature distributions in a PEMFC single cell whatever the operating conditions. The work comprises of three parts: Firstly, a litterature survey was conducted to describe the principle of a PEMFC and the fundamental operations. A state of the art of the previous modeling works on the PEMFC was also presented in this part. Secondly, the developed model using the basic relations to describe heat and charges transfer phenomena occurring in the single PEM cell was presented. Finally , a simple simulation tool called FCvb was performed and optimized using Visual Basic Excel and refering to the previous relations in the developed model. To finalize this basic study, a conclusion and perspectives were presented in the last part of this work.

Abstract: There are two classification including volcanic lava and volcanic clastic rock, totally 15 types in Yingcheng Formation, Yaoshen area. The lithology is mainly characterized as acid rhyolite, tuffs and volcanic breccia. By using logging data and seismic data, the authors come to the conclusion as follows: there existed five types of lithofacies of volcanic lava in this area, with eruption-overflow facies most widely developed. The section is characterized as eruption mixed with overflow, superposed eruption-overflow facies and volcanic sedimentary facies occurred far from the crater. There are frequent volcanic activities, multi-periodic activities of volcanic eruption developed, thus multi-periodic eruption modes were formed. This area is overlapped and connected in the plane, adjacent eruption facies are often connected, overflow facies are distributed on lave platform.

Abstract: By observing rock thin sections, starting from the analysis on rock samples, mercury injection curves, casting thin sections and scanning electron microscopy, a detailed study of under Jurassic Badaowan Formation of the North Lake Oilfield heterogeneity in terms of content is done for the prediction and evaluation of favorable reservoir.

Abstract: This paper presents the mathematical model of the thermal influence to the aquatic environment of thermal power plant, which is solved by the Navier-Stokes and temperature equations for an incompressible fluid in a stratified medium. Numerical algorithm based on the projection method which solved with fractional step method. Three dimensional Poisson equation solved with Fourier method with combination of tridiagonal matrix method (Thomas algorithm).

Abstract: This paper introduceda study for the methodology of carbon nanotube (CNT) sensor applicable for the strain measurement in microscale. By using the Raman strain sensitive and polarization selectivity of the carbon nanotubes, the analytical relationship of carbon nanotube strain sensor for each polarization Raman configuration are deduced and compared. The work regarded that the dual coordination polarization-controlled configuration is most suitable for the in-plane strain measurement. Then, a new method for this configuration is presented. Experiments proved that the proposed method can effectively realize the measurement of in-plane strain components by using polarized Raman.

Abstract: The present paper derives an expression for internal energy of the Non-spinning black holes using first law of black hole thermodynamics and calculates their values of different test Non-spinning holes existing in X-ray binaries (XRBs) and Active Galactic Nuclei (AGN).