A Frequency Assignment Problem (FAP) is the problem that arises when to a given set of transmitters frequencies have to be assigned such that spectrum is used efficiently and the interference between the transmitters is minimal. In this paper we see the frequency assignment problem as a generalised graph colouring problem, where transmitters are presented by vertices and interaction between two...

Although the urinary bladder urothelium has classically been thought of as a passive barrier to ions/solutes, a number of novel properties have been recently attributed to these cells. Studies have revealed that the urothelium is involved in sensory mechanisms (i.e., ability to express a number of sensor molecules or respond to thermal, mechanical, and chemical stimuli) and can release chemical...

Birder, Lori A. More than just a barrier: urothelium as a drug target for urinary bladder pain. Am J Physiol Renal Physiol 289: F489–F495, 2005; doi:10.1152/ ajprenal.00467.2004.—Although the urinary bladder urothelium has classically been thought of as a passive barrier to ions/solutes, a number of novel properties have been recently attributed to these cells. Studies have revealed that the ur...

Recent evidence indicates that free amino acids are nutrients as well as acting as chemical transmitters within the gastrointestinal tract. Gut glutamate research is the most advanced among 20 amino acids. Free glutamate carries the umami taste sensation on the tongue and a visceral sensation in the gut, especially the stomach. In the field of taste physiology, the physiological meaning of the ...

This document does not contain technology or technical data controlled under either the U.S. International Traffic in Arms Regulations or the U.S. Export Administration Regulations. With the development and widespread use of wireless devices in recent years (mobile phones, Internet of Things, Wi-Fi), the electromagnetic spectrum has become extremely crowded. In order to counter security threats...

This paper aims at investigating the superiority of power allocation strategies, based on calculus of variations in a point-to-point two-way relay-assisted channel incorporating the amplify and forward strategy. Single and multilayer coding strategies for two cases of having and not having the channel state information (CSI) at the transmitters are studied, respectively. Using the notion of cal...

We analyze the error performance of distributed space-time codes in a wireless system with multiple cooperating transmitters and a single receiver. Due to the distributed nature of the system, the transmitted signals are subject to different average path losses. As our analysis shows, this effect leads to reduced diversity gains. We explain this result on the basis of an interesting duality bet...

sheikh murtaza ansārai is regarded as one of the greatest imamite jurists, and one of the prominent scholarly and juristic figures of the last centuries. his proficiency, originality and gumption are evident in his surviving works regarding problems in principles (usūl) and traditional-demonstrative jurisprudence. his precious researches on “investigation and criticism of chain of transmission ...