We use time-dependent density functional theory to study self-irradiated Si. We calculate the electronic stopping power of Si in Si by evaluating the energy transferred to the electrons per unit path length by an ion of kinetic energy from 1 eV to 100 keV moving through the host. Electronic stopping is found to be significant below the threshold velocity normally identified with transitions acr...

The behaviour of semi-dilute wormlike micelle solutions under vertical vibrations is investigated using classical measurements of the Faraday instability threshold along with two new experiments based on particle imaging velocimetry and birefringence. We provide evidence for the presence of oscillations of the critical acceleration and wave number with the vibration frequency, which are linked ...

We have investigated the role of turbulence for two problems, the effect of the polarization current on the NTM and the effect of diamagnetic drifts on mode penetration. For the NTM problem, we find that the fluctuations exert a drag force on the island that results in a stabilizing slowdown in the propagation velocity. For the mode penetration problem, we have investigated the influence of pol...

Dark matter (DM) annihilation in the galactic halo can be enhanced relative to that early Universe due Breit-Wigner enhancement, if DM particles annihilate through a narrow resonance. Although $s$-wave enhancement provide consistent explanation for both observed cosmic-ray (CR) positron excess and thermal relic density, it is severely constrained by observations of gamma rays from dwarf spheroi...

1. Sharksuckers use active branchial ventilation when swimming or at rest in stationary water. When attached to a moving object or when placed in a water current, they shift to ram gill ventilation as water velocity exceeds a certain threshold. 2. Water velocities required for the transition from active to ram gill ventilation were from 10-50 cm s-1, depending on the size of the fish. 3. Oxygen...

Based on results from the literature, a description of sound generation in a recorder is developed. Linear and non-linear analysis are performed to study the dependence of the frequency on the jet velocity. The linear analysis predicts that the frequency is a function of the jet velocity. The non-linear resolution provides information about limit cycle oscillation and hysteretic regime change t...

Radial velocity surveys are beginning to reach the time baselines required to detect Jupiter analogs, as well as sub-Saturn mass planets in close orbits. Therefore it is important to understand the sensitivity of these surveys at long periods and low amplitudes. In this paper, I derive analytic expressions for the detectability of planets at both short and long periods, for circular and eccentr...

OBJECTIVE To validate a handheld screening device (NeuroQuick) for an early detection of diabetic distal symmetric polyneuropathy (DSP) by quantitative testing of cold sensation based on the wind chill factor (NeuroQuick threshold [NQT]). RESEARCH DESIGN AND METHODS NQT was measured on the dorsum of the foot in 160 healthy subjects as well as 60 and 128 diabetic patients without and with DSP,...

Traffic simulation models have increasingly been used due to low cost, time saving and ability to examine possible solutions for traffic-related problems without interrupting the real life traffic conditions during testing alternative scenarios. Recently, visual angle car following model has been studied and examined by the author for use in developing a microsimulation car following model. The...

The basic properties of traffic flow are analyzed using a simple deterministic one dimensional car following model with continuous variables based on a model introduced by Nagel and Herrmann [Physica A 199 254–269 (1993)] including a few modifications. As a first case we investigate the creation and propagation of jams in a platoon generated by a slow leading vehicle. In a second case we look a...