Sharif Digital Repository

In this investigation has been tried to indagate the Bell’s inequality both theoretically and experimentally. This inequality published by John Bell in 1964 on the EPR argument. In the EPR argument they reasonably deduced that quantum mechanics with the wave function interpretation is incomplete (but proposing correct results), so we must looking for a deterministic and more fundamental and underlying theory than common quantum mechanics, the alternative theory shall contain Reality and Locality assumptions and also could produce current quantum mechanics results. Afterward, scientific probation started for finding a deterministic theory that including hidden variables, infact supplement... 

Pile is used to transfer high loads from the structure by bearing on the hard soil layers or through the friction between the soil and the pile. Axial loads and transversal or lateral loads are the main loads apply on the piles. There are several different methods to investigate the pile behavior under lateral load: (1) Limit State method (2) Subgrade Reaction method (3) Elastic method (4) P-Y method (5) Evans and Duncan method (6) Numerical methods. Blum, Brinch Hansen and Broms methods are based on the Limit State method to determine the lateral capacity of pile. Although these methods are simple and the results can find quickly, they failed to calculate the soil resistance under lateral... 

The synthetic aperture radar (SAR) is a microwave imaging radar that achieves high resolution while taking advantage of pulse compression technology and the Doppler effect. In typical radar systems, in order to obtain a good azimuth resolution, one should use an antenna with big aperture. However this is not possible in many cases. SAR has overcome this problem by moving the antenna and so making a synthetic aperture. In inverse SAR (ISAR) the radar antenna is static and synthetic aperture is created by the movement of target. Typical SAR imaging aims at the static targets and when the target is moving, it does not operate well. When detecting moving targets by SAR, both radar and target are... 

In this research, we tried to investigate the effect of a firm’s IPO on the operational performance of its rivals. We used a dynamic structural oligopoly model to distinguish between hypotheses that can explain the industry evolution after the initial public offering, to estimate the value of rival firms’ post-IPO. The results showed that rival firms suffered losses in most IPO events and these losses were caused by industry trends. However, in some IPOs, the initial impact of an IPO on rival firms was through changing production technologies or reducing product homogenization, which increased their profitability. A much smaller percentage of observations also found evidence of competitive... 

Dump trucks are one of the most important and valuable equipment used in mining, and the implementation of proper maintenance and monitoring programs for these machines is of special significance. The most critical part of a dump truck is its diesel engine, and the most effective method for monitoring its condition is to conduct lubricant analysis. Accuracy and speed in the lubricant analysis process significantly contribute to enhancing the efficiency of maintenance and monitoring programs for the equipment. Given the complexities of analyzing the condition of diesel engines in dump trucks due to the interactions among multiple engine parameters and various lubricant characteristics, there... 

Aiming to improve the extraction performance of wind energy has led to the noticeable increase of the structural dimensions in the modern wind turbines. The larger blade with more flexibility experiences large structural deformation even under nominal operational loading, so the nonlinear modeling and analysis of these structures have become as important subject of the recent wind turbine researches. In this dissertation, the geometrical exact model of the rotating wind turbine blade under the effects of the tower tip's motion, and also the operational loading comprising the aerodynamic and gravitational loadings is presented. In this way, the geometrical exact beam formulation is developed... 

The continuous rise in electricity demand and the ever growing power generation in different power networks over the world have caused the short circuit level in the power systems to exceed the operational rating of the installed power devices (including cables, circuit breakers and buses). Replacing these devices with new higher rating devices is an expensive solution. From this point of view, utilizing fault current limiters is an economical solution. Superconducting fault current limiters form an efficient category of current limiters. This type is expected to be studied and used widely in future due to their advantages. In this thesis, the first chapter reviews the superconductivity...