In conventional direct torque control (DTC) of induction machines, undesirable flux and torque ripples are produced. These occur since non of the selected inverter's voltage vectors are able to generate the exact voltage required to produce the desired changes in the electromagnetic torque and stator flux linkage in most of the switching instances. In addition, when direct torque control is imp...

in this paper, changes of casson non-newtonian fluid velocity profile, for different distribution of porosity, have been investigated. for distribution of porosity, fixed, radial and exponential variations has been considered. for all three states, brinkman model has been used as momentum equation. since the casson fluid is a good model for blood, this analysis can be used in studying about cho...

BACKGROUND AND AIM: Beauty standards are related to race and change over time with cultural changes. The criteria obtained for a specific race cannot be used as treatment planning criteria for other races and societies. It seems that no thorough study has been carried out in Iranian context to determine the acceptability of these standards. In this study, the desired nasolabial (NL), nasofronta...

Dependable architectures demonstrably possess properties such as safety, security and fault tolerance. We are interested in developing methods allowing formal demonstrations through proof that an architecture does indeed possess the desired dependability properties. We focus on architecture hierarchies as a means of enabling such demonstrations. Integrated avionics offer unprecedented generalit...

In the paper, the geometrical parameters and energetics of the extremely narrow pseudo-nondiffracting beams with the spot size of several micrometers are examined. The main attention is focused on design, realization and testing of the set-up enabling conversion of the laser diode beam or the fiber mode to the narrow Bessel-Gauss beam whose spot can be continuously relocated across the plane pe...

The paper is dedicated to adaptive services enabling real– time image communications. A proposal is made how adaptive strategies can be applied to provide an optimal level of service quality. The service parameters are determined by a currently available communication link, while providing a user with desired service grade. Both strategies and supporting technologies are to be presented through...

In their 2016 article, Saltman and Duran provide a thoughtful examination of the governance challenges involved in different care delivery models adopted in primary care and hospitals in two European countries. This commentary examines the limited potential of structural changes to achieve real reform and considers that, unless governance arrangements actually succeed in penetrating organizatio...

today, the tourism industry is of a special significance; during the past 50 years , this industry has turned into one of the major actors in the field of international trade as well as providing significant resources for income in most of the developed and developing countries. any country defines an appropriate policy in order to attract foreign tourists. policy making in the field of tourism...

In this work, we synthesize large-area thin films of a conjugated, imine-based, two-dimensional covalent organic framework at the solution/air interface. Thicknesses between ∼2-200 nm are achieved. Films can be transferred to any desired substrate by lifting from underneath, enabling their use as the semiconducting active layer in field-effect transistors.