An angular momentum operator in loop quantum gravity is defined using spherically symmetric states as a non-rotating reference system. It can be diagonalized simultaneously with the area operator and has the familiar spectrum. The operator indicates how the quantum geometry of non-rotating isolated horizons can be generalized to rotating ones and how the recent computations of black hole entrop...

Rotating machinery is the most common machinery in industry. The root of the faults in rotating machinery is often faulty rolling element bearings. This paper presents a technique using optimized artificial neural network by the Bees Algorithm for automated diagnosis of localized faults in rolling element bearings. The inputs of this technique are a number of features (maximum likelihood estima...

Over the last decade, measurements of the cosmic microwave background (CMB) anisotropy have spearheaded the remarkable transition of cosmology into a precision science. However, addressing the systematic effects in the increasingly sensitive, high-resolution, ‘full’ sky measurements from different CMB experiments poses a stiff challenge. The analysis techniques must not only be computationally ...

Deburring is a significant area of research for robot application. However, it is difficult to obtain details on this important topic in modern text books and archival journal papers. Therefore, in general, the engineer is subjected to a time consuming decision making process that usually involves trial-and-error procedures. This chapter will attempt to organize important know-how and field exp...

Prediction of the deformation characteristics is an important step to understand the workability of alloys during imposing large strains. In this research, severe plastic deformation of Sn-5Sb solder alloy was carried out under different t deformation conditions, including the temperature range of 298, 330, 36, 400 K and die designs. The current study applies an experimentally validated finite ...

Thermal expansion and hot deformation are two phenomena causing dimensional errors in investment casting. This error occurs in dimensions between the die and wax pattern. Therefore, the wax's thermo-physical and thermo-mechanical properties, the metal die features, and the process parameters affect the dimensions of the wax pattern. Some important effective process parameters are the injection ...

rotating machinery is the most common machinery in industry. the root of the faults in rotating machinery is often faulty rolling element bearings. this paper presents a technique using optimized artificial neural network by the bees algorithm for automated diagnosis of localized faults in rolling element bearings. the inputs of this technique are a number of features (maximum likelihood estima...

Utilizing optical Fiber Bragg Grating’s (FBG) characteristic of transmission optic signals in noncontact way, the measure method of the twisted, variable cross-section, variable thickness, rotating rectangular blade’s local strain has been presented. Firstly, by using the finite element method to obtain the rotating blade’s natural frequency, modal shape and strain modal shape, the mounting loc...

Background Shift-workers commonly suffer from insomnia. This study evaluates different domains of insomnia. Aim This study was aimed to study sleep and insomnia in rotating shift-workers and compare with day-workers. Materials and Methods This was case-control study. The sleep of rotating shift-workers is compared with day workers using Athens Insomnia Scale. Results Rotating shift-worker...

This paper describes a novel measurement method to accurately measure the rotating shaft tilt angle of rotating machine for alignment or compensation using a dual-axis inclinometer. A model of the rotating shaft tilt angle measurement is established using a dual-axis inclinometer based on the designed mechanical structure, and the calculation equation between the rotating shaft tilt angle and t...