IR spectra of entrance and exit channels methane radical oxygen reaction are predicted in the ground state energy. Ab initio calculations at perturbation theory (MP2) with Dunning correction- consistent basis set (aug-cc-pVDZ) have been used. The structures, vibrational frequencies potential energy surface. Three van der Waals minima from three adiabatic surfaces channels. Vibration frequency 3...

Strengthening executive constraints is one of the key means of improving political governance. This paper examines how such reforms are related to threats to the tenure of ruling political incumbents. We formalize this idea theoretically and test it empirically, using data on leaders since 1875. Specifically, we distinguish leaders with different degrees of resilience as leaders who die from na...

Grain refinement improves the mechanical properties and formability of metals and alloys. So far, several different grain refinement methods have been proposed and studied. Severe plastic deformation is one of the most promising and efficient methods. Therefore, in the present study the possibility of imposing a two-step severe plastic deformation (Extrusion and Equal channel angular pressing) ...

The paper presents accurate numerical solutions of the full two-dimensional governing equations for steady and unsteady laminar/laminar internal condensing flows. The results relate to issues of better design and integration of condenser-sections in thermal management systems (looped heat pipes, etc.). The flow geometry, in normal or zero gravity, is chosen to be the inside of a channel with fi...

Totally blind APP channel estimation is based on the A Posteriori Probability (APP) calculation algorithm. Asymmetrical modulation schemes are used in order to resolve the phase ambiguity with no need for any pilot or reference symbols. In OFDM-systems, the two-dimensional channel estimation is performed by applying a concatenation of two one-dimensional APP estimators for frequency and time di...

Abstract This paper deals with the reconstruction of the inlet temperature profile of a melted polyethylene (PE) flowing through an extrusion die. The inverse heat transfer problem is formulated as an optimisation problem by considering both the energy and the Navier-Stokes equations. It is solved by using the conjugate gradient algorithm. Experimental results are presented and show the effect ...

The current IEEE 802.16a and 802.16d standards of wireless metropolitan area networks specify a ranging channel in the OFDMA physical layer that employs a set of CDMA codes for ranging and bandwidth requests. The ranging channel is contention-based and inherently unstable. In this paper, we propose two stabilization algorithms to enable efficient utilization of the ranging channel at close to t...

The flickery block of single Ca'-activated K+ channels that is produced by internally applied Na' can be relieved by millimolar concentrations of external K+. This effect of K+ on the kinetics of Na' block was studied by the method of amplitude distribution analysis described in the companion paper It appears that K+ relieves block by increasing the exit rate of the blocking ion from the channe...