In this study, the free vibration analysis of a functionally graded (FG) micro-beam with tapered cross-section is carried out theoretically. The beam has material distribution according to power law throughout thickness. governing equation reduced an ordinary differential for cross-sectional geometry whose width varies exponentially. Vibrations microbeams were analyzed analytically in elastic v...

Theoretical investigation on optical self action effects of intense q-Gaussian laser beams interacting with collisionless plasmas axial density ramp has been presented. Emphasis are put investigating the dynamics beam width and phase beam. Effect ellipticity cross section also incorporated. Using variational theory based Lagrangian formulation nonlinear partial differential equation (P.D.E) gov...

To generate high quality synchrotron radiation in the future ERL light sources, the performance of the ERL injector, which has critical components, a photo cathode gun and super conducting cavities, is very important. In the injector, an electron beam is generated by photo cathode DC gun, and accelerated by super conducting RF cavities. Since an electron beam with −77 pC bunch charge and 1.3 GH...

background: field matching problems in abutting electron fields can be managed by using spoilers. objective: the aim of this study was to design a monte carlo framework for the assessment of spoiler application in abutting electron fields. methods: a siemens primus treatment head was simulated for a 5 mev electron beam using beamnrc and dosxyznrc, egsnrc user codes. validation of beam model was...

Fire is one of the main hazards that can affect steel buildings and bridges was responsible, e.g., for collapse Plasco building in Tehran, Iran, I-65 bridge Birmingham, Alabama, USA. This vulnerability has motivated development advanced computational models to predict response structures fire accurately. The mechanical slender members especially important because they fail prematurely by buckli...

The scattering of α-particles off of gold foil was investigated. Attenuation of the α-particle beam was used to measure the thickness of the gold foil used. The coefficient of the Rutherford differential scattering cross section was experimentally determined to be (7.81 ± 5.35) × 10−25cm2, compared to 1.76 × 10−24cm2, with a reduced chi-squared of 3.4, which is a reasonable fit and confirms the...

A high precision inclusive measurement of the diffractive deep inelastic scattering (DIS) process ep → eXY is presented, where Y is a proton or a low mass proton ex-citation carrying a fraction 1 − x IP > 0.95 of the beam longitudinal momentum and the squared 4-momentum transfer at the proton vertex t > −1 GeV 2. The measurement, based on an integrated luminosity of 10.6 pb −1 , is presented in...

With a 7 T wiggler in operation all attempts to detect the resonant depolarization of the electron spins were unsuccessful at BESSY II. This was attributed to the severely reduced degree of spin polarization of the electrons moving in the alternating fields of the strong wiggler which on the other hand nearly doubles the radiation loss per turn. The key to a clear detection of the depolarizatio...

ABSTRACT: Several reinforced concrete deep beams with different L/D ratios (1.5, 1.6, 1.71) were cast and tested in order to investigate the strain distribution pattern at mid-section of the beam. This paper describes analysis of deep beams subjected to two point loading with three different L/D ratios (1.5, 1.6, 1.71) using Non-linear Finite element method (ANSYS 9.0 software). In ANSYS 9.0 so...

We demonstrated low-loss and single-mode laser beam delivery through hollow-core waveguides (HCWs) operating in the 3.7-7.6 μm spectral range. The employed HCWs have a circular cross section with a bore diameter of 200 μm and metallic/dielectric internal coatings deposited inside a glass capillary tube. The internal coatings have been produced to enhance the spectral response of the HCWs in the...