A visual measurement method based on a key point detection network is proposed for the difficulty of fitting cross-sectional profile ultra-narrow gap welds and low efficiency accuracy manual geometric parameters. First, HRnet (High-Resolution Net) algorithm was used to train feature model, 18 points in “measurement unit” were extracted. Secondly, coordinates are transformed from image coordinat...

We employ the string method to numerically evaluate the thermally activated phase slips in one-dimensional superconducting wires with nonuniform cross section. A defect with reduced cross-sectional area opens up a channel for phase-slip transition, for which the free-energy barrier and the preexponential factor associated with the transition rate are numerically calculated. The contribution of ...

We present a novel method for maximizing signal gain in continuously pumped silicon-waveguide Raman amplifiers made with silicon-on-insulator technology. Our method allows for pump-power depletion during Raman amplification and makes use of a variational technique. Its use leads to a system of four coupled nonlinear differential equations, whose numerical solution provides the optimal axial pro...

Mitochondria were isolated using sorbitol and high buffer concentration in the medium. X-ray diffraction patterns arising from the mitochondrial cristae-membrane were recorded in the fully dried state and in two different states in humidity. The Q-function evaluation of these X-ray diffraction diagrams resulted in electron density cross-section profiles, which consist of two main peaks of oppos...

In a large region of the supersymmetry parameter space, the annihilation cross section for neutralino dark matter is strongly dependent on the relative velocity of the incoming particles. We explore the consequences of this velocity dependence in the context of indirect detection of dark matter from the galactic center. We find that the increase in the annihilation cross section at high velocit...

1.1. Flows driven by a constant pressure gradient through a pipe of circular cross section When the flow of a Newtonian fluid in a pipe of circular cross section is driven solely by a constant pressure gradient, the resulting velocity distribution is a quadratic function of the radial distance from the axis of the pipe. The velocity profile of such a flow has, therefore, a parabolic distributio...

We investigate the possibility that ultra-high energy cosmic rays (UHECRs) originate from the annihilation of relic superheavy (SH) dark matter in the Galactic halo. In order to fit the data on UHECRs, a cross section of 〈σAv〉 ∼ 10 −26cm2(MX/10 12 GeV) is required if the SH dark matter follows a Navarro–Frenk–White (NFW) density profile. This would require extremely large-l contributions to the...

Following prior analysis for measured pp elastic differential cross section, the impact parameter representation in terms of profile functions is calculated from two different parameterizations on single diffractive dissociation data. The derivative of this quantity with respect to the collision energy squared s measures the growth rate of the reaction’s blackness. Its distribution in impact pa...