in this paper, a simple and efficient method for modeling and solving the equations of a rotor with any number of disks, bearings and mass unbalances is presented using the assumed modes method. this model consists of a continuous shaft, arbitrary number of mass unbalances in any axial location and phase angle, and any number of rigid disks and bearings. this arrangement is extensively used in ...

In this work the effects of heat generation on the modes of Yb:Glass double clad fiber laser were investigated. The thermal dispersion and thermally-induced birefringence were considered when the gain medium becomes an anisotropic medium. The results showed considerable modifications of laser modes profiles, in particular for transfer magnetic (TM) and transfer electric (TE) modes which their p...

Stiffness matrix of the four-node quadrilateral plane stress element is decomposed into normal and shear components. A computer program is developed to obtain the straining modes using adequate and reduced integration. Then a solution for the problem of mixing straining modes is found. Accuracy of the computer program is validated by a closed-form stiffness matrix, derived for the plane rectang...

Ni ferrite crystalline material is synthesized using a sol-gel method at two different temperatures. The vibrational and stretching modes, crystalline phase, size distribution and morphology of the products are investigated via Raman back-scattering and Fourier transform infrared (FTIR) spectroscopy, XRD and FESEM, respectively. Vibrational modes of spinel ferrite are observed at Raman and FTIR...

simultaneous with the industries increasing growth, thecompanies must acquire the new technologies to achieve the core competency,survival and improvement and also effectiveness in market. choosingthe suitable acquisition mode of required technology is one of thecritical strategic decisions in the field of technology management. dueto the importance of technology acquisition, the main objective...

roy adaptation model in hemodialysis patients: a mixed method research hassani p[1]*, otaghi m[2] received: 17 may, 2012 accepted: 13aug, 2012 abstractbackground & aims: ram is used in ersd patients. nurses play important role in their adaptation. the goal of the study is to explain the adaptive and ineffective responses of hemodialysis patients based on ram in qualitative part, and to compare ...

in this study, bio-based carbon nanotubes (cnts) have received considerable research attention due to their comparative advantages of high level stability, simplistic use, low toxicity and overall environmental friendliness. new potentials for improvement in heat transfer applications are presented due to their high aspect ratio, high thermal conductivity and special surface area. phonons have ...

INTRBackground and Objectives: Good medical nutrition therapy (MNT) is crucial to inpatients' health and treatment, and is part of routine hospital cares. Surgery ward is a highly danger-prone section in any hospital. The present study was conducted for a proactive risk analysis of nutrition and food distribution in Mashhad Qaem Hospital’ Women’s Surgery Ward in 2013 through health care failure...