We used ion beam induced luminescence (IBIL) to study the evolution of damage during ion implantation of natural type-IIa diamond with 30 keV carbon ions, for different sample temperatures in the range 35-300 K. Blue band-Aluminescence decays with irradiation dose from an initial value of -10e3 photons/e-h pair. This decay was modeled to obtain an effective damage cross section of -40 A2, which...

We estimate the total ee → t̃t̃ cross section near threshold for a Coulombic potential and compare it to the Born approximation. The effect of the beam energy spread for present and future ee colliders is discussed. ∗[email protected]

The web crossed truss boom is one of the commonly used structures crawler cranes. However, existing calculations fail to consider limiting effect members' bending resistance on chord members, and cannot give full play load-bearing capacity structure. This paper takes top section Crawler crane as research object. single-span theoretical model established according Timoshenko's elastic stability ...

In the present study, buckling problem of nonhomogeneous microbeams with a variable cross-section is analyzed. The microcolumn considered in this study made functionally graded materials longitudinal direction and varies continuously throughout axial direction. Bernoulli–Euler beam theory conjunction modified strain gradient are employed to model structure by considering size effect. Rayleigh–R...

The finite element method is employed for the flexural-torsional linear buckling analysis of beams of arbitrarily shaped composite cross-section taking into account generalized warping (shear lag effects due to both flexure and torsion). The contacting materials, that constitute the composite cross section, may include a finite number of holes. A compressive axial load is applied to the beam. The...

Abstract This paper presents a novel approach to coupling beam and solid elements. Connecting standard elements with results in situation where the part of model covers cross-sectional deformation, while at assumptions only consider rigid body movement cross-section. Therefore, kinematic do not include cross-section deformations such as warping contraction. Due this restriction, spurious stress...

In the present study, free vibration behaviors of of carbon nanotube (CNT) and boron nitride nanotube (BNNT) have been investigated via Eringen’s nonlocal continuum theory. Size effect has been considered via nonlocal continuum theory. Nanotubes have become popular in the world of science thanks to their characteristic properties. In this study, free vibrations of Boron Nitride Nanotube (BNNT) ...

The NuTeV experiment at Fermilab has obtained a unique high-statistics sample of neutrino and antineutrino interactions using its high-energy sign-selected beam. We present a measurement of the differential cross section for charged-current neutrino and antineutrino scattering from iron. We determine the relative to cross section, r = , at high energy with errors a factor of 2 smaller than the ...

Pion multiplicity in heavy-ion collisions at the beam energies of about 1 A GeV [1, 2] is usually overpredicted by transport calculations with vacuum cross sections. Recently [3] we proposed to take into account the in-medium modifications of the NN → N∆ cross section, namely, the exchange pion collectivity, vertex renormalization by the contact nuclear interactions and Dirac effective masses o...

Results on the measurement of electroweak processes in e±p collisions at HERA by the H1 and ZEUS experiments are presented. All data collected at HERA corresponding to a total integrated luminosity of about 1 fb−1 are used for most of the measurements. Inclusive cross section measurements of deep inelastic neutral current (ep → eX) and charged current (ep → νX) scattering are shown. The influen...