In this paper‎, ‎we study the class of rings in which every $P$-flat‎ ‎ideal is flat and which will be called $PFF$-rings‎. ‎In particular‎, ‎Von Neumann regular rings‎, ‎hereditary rings‎, ‎semi-hereditary ring‎, ‎PID and arithmetical rings are examples of $PFF$-rings‎. ‎In the context domain‎, ‎this notion coincide with‎ ‎Pr"{u}fer domain‎. ‎We provide necessary and sufficient conditions for‎...

in 2001, s. bulman-fleming et al. initiated the study of three flatness properties (weakly kernel flat, principally weakly kernel flat, translation kernel flat) of right acts $a_{s}$ over a monoid $s$ that can be described by means of when the functor $a_{s} otimes -$ preserves pullbacks. in this paper, we extend these results to$s$-posets and present equivalent descriptions of weakly kernel po...

We describes a framework in which to view the end-to-endindependently-verifiable (E2E) voting systems based on mixnets. We use the framework to invent new systems that combine front and back-ends from existing systems.

A lubricant transfer process that enhanced the wear life of a MoS2 coating has been identified and quantified. A steel ball sliding against a coated steel flat in reciprocating motion produced reservoirs at the turnaround part of the track ends, then emptied them, to provide replenishment similar to what is expected of liquid lubricants. The dynamics of the process were inferred from measuremen...

objective gastroenteritis has a diverse etiology; many pathogens can cause this condition. of the extraintestinal manifestations, one is convulsions, which may be  attributable to fever, type of bacteria, or electrolyte imbalance. to assess the risk of occurrence of convulsions, in this study we investigated the association between the paraclinical and clinical findings of children with gastroe...

Two novel experiments are reported which improve upon previous experimental studies of Richtmyer-Meshkov instability in that very well controlled initial interfaces are obtained. The first is an incompressible experiment in which an impulsive acceleration is given to a system of two liquids by bouncing it off of a fixed spring. The second is a shock tube experiment in which a well controlled fl...

The capacity of a flat-fading wireless channel increases with the number of antennas used at both ends of the wireless link. However, the complexity of Multiple Input Multiple Output (MIMO) transmission algorithms increases coincidently. Transmitting and receiving over a subset of the available antennas is referred to as antenna selection. A signal strength based selection criterion is introduc...