نتایج جستجو برای: main phase
تعداد نتایج: 1160619 فیلتر نتایج به سال:
Theoretical prediction of surface stellar abundances light elements–lithium, beryllium, and boron–represents one the most interesting open problems in astrophysics. As well known, several measurements 7 Li atmospheres point out a disagreement between predictions observations different evolutionary phases, rising doubts about capability present models to precisely reproduce envelope characterist...
aim: professional commitment has been widely discussed during the last decade. there is no comprehensive definition about “professional commitment in iranian nurses.” hence, this study was conducted with the aim of analyzing the concept of professional commitment in iranian nurses. materials and methods: hybrid model was used in three phases. firstly, in the theoretical phase, data were retriev...
In this research. The magnetic phase transition and anisotropic magnetoelastic effects of a polycrystalline sample of Nd14Dy2Fe78B6 were studied by susceptibility and magnetostriction measurements. The composition was prepared by casting method. SEM pictures and XRD analysis showed that it was composed of polycrystalline magnetic phases with the main phase of 2-14-1. Results of ac susceptibil...
in this thesis, using concepts of wavelets theory some methods of the solving optimal control problems (ocps). governed by time-delay systems is investigated. this thesis contains two parts. first, the method of obtaining of the ocps in time delay systems by linear legendre multiwavelets is presented. the main advantage of the meth...
Abstract This work proposes a novel method to find the phase error and oscillation amplitude in multiphase LC oscillators. A mathematical approach is used to find the relationship between every stage's output phase and its coupling factor. To much more general analysis, every stage assumed to have a different coupling factor. The mismatches in LC tanks are considered as the main source of pha...
Background: There is no need to explain the importance of collection, recording and analyzing the information of disease in any health organization. In this regard, systematic design of standard data sets can be helpful to record uniform and consistent information. It can create interoperability between health care systems. The main purpose of this study was design the core dataset to record co...
The aim of this research is to investigate different X-ray based quantitative phase analysis methods for determination of cristobalite phase content in ceramic cores. For this purpose, four popular routes including peak absolute intensity method, relative intensity ratio method, direct or calibration method and internal standard (or Alexander-Klug) method have been chosen. Some control samples ...
In this paper a new topology is introduced for three-phase inverter that includes a multi-level module, a three-phase inverter bridge and middle levels selection unit. The main advantage of proposed topology is using fewer switches and diodes to reach the maximum level of output voltage. The structure consists of a single-phase multilevel module; three bidirectional switches and a three-phase i...
The main defects present in historical documents are darkness, non-uniform clarification, bleed-through and faded characters. To remove these defects binarization method is used. In this paper a phase based binarization method is studied in which phase of ancient document images is preserved. This method is derived in to three steps: preprocessing, main binarization and post processing. In prep...
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