In a recent paper we studied rolling tachyon flat FRW cosmologies, but those admitting only time-reversal asymmetric boundary conditions. The time-reversal symmetric cosmologies have been studied by Sen previously. We show explicitly here that through appropriate choice of initial conditions, the time evolution of the Hubble parameter in these two types of solutions can be made completely ident...

Microstructure evolution, mechanical properties, formability, and texture development were determined for AA6111 samples processed by asymmetric rolling (ASR) with different roll friction, velocity, or diameters, conventional rolling (CR), and equal-channel-angular pressing (ECAP). Highly elongated or sheared grain structures were developed during ASR/CR and ECAP, respectively. ASR led to impro...

In a recent paper we studied rolling tachyon flat FRW cosmologies, but those admitting only time-reversal asymmetric boundary conditions. The time-reversal symmetric cosmologies have been studied by Sen previously. We show explicitly here that through appropriate choice of initial conditions, the time evolution of the Hubble parameter in these two types of solutions can be made completely ident...

This paper studies interconnect sizing and spacing (ISS) problem with consideration of coupling capacitance for performance optimization of single or multiple critical nets. We introduce the formulation of symmetric and asymmetric wire sizing. We develop efficient bound computation algorithms for ISS optimization and prove their optimality under general interconnect resistance and capacitance m...

A. Kawałek, Czestochowa University of Technology, Czestochowa, Poland The paper presents the results of asymmetrical plate rolling in the finishing rolling stand of a 3600 mill. The investigation was carried out for S690Ql steel sheets. Tests were conducted for two types of the asymmetric rolling process. In the first case, the asymmetry of the process was introduced by varying the speed of the...

The key priority of metallurgical industry development is expanding the range and improving quality bar products their major component, steel wire. Continuous wire rod mills with multi-roll passes have been developed implemented over past decades. These include four-roll mutually perpendicular rolls. specific feature complex impossibility conduct direct measurement workpiece dimensions in sever...