'I A cavity pressure method for measuring t he gain of hearing aids has been--developed. It has the advantage of req uiring no " dead " room, allo~ing a compact setup. The method has been investigated as to its validity and t he degree to which diffraction effects are avoided. Comparisons with free-field data are made. The applicability of results obtained by this method to t he specifi cation ...

To extend lifetime of battery-powered mobile device before its recharging in broadband wireless access networks, power saving mechanism in MAC (medium access control) has become a significant design issue. Basically, a power saving mechanism is manipulated by adjusting operating parameters such as the minimum sleep interval (Tmin) and the maximum sleep interval (Tmax). In this paper, we propose...

A comprehensive study on essential oils extracted from different Calamintha nepeta (L.) Savi subsp. glandulosa (Req.) Ball samples from Tarquinia (Italy) is reported. In this study, the 24-h steam distillation procedure for essential oil preparation, in terms of different harvesting and extraction times, was applied. The Gas chromatography-mass spectrometry (GC/MS) analysis showed that C. nepet...

level Concrete level refinement −−−−−−→ ConnectToServer Details used to establish the connection abstraction ←−−−−−− Formalisation of abstraction Let σ : A → P(B) be a substitution. Abstract level Concrete level σ(L) = {w ∈ A | σ(w) ∩ L '= ∅} abstraction ←−−−−−− L ⊆ B 5/29 Adding time to the picture Timed refinement refinement −−−−−−→ Abstract level Concrete level abstraction ←−−−−−− ConnectToS...

Background:Thermal stress may have numerous harmful effects on human health. This study aimed at investigating thermal stress in the city of Kerman, Iran. Methods:In this descriptive-analytical study, thermal stress was assessed from 6 AM to 9 PM in 2016 using four thermal stress indices including wet-bulb globe temperature (WBGT), environmental stress index (...

IN 1994, an estimated 39720 persons died from firearm-related injuries.1 Firearms now rank a close second to motor vehicles as a cause of traumatic death nationwide. This convergence results not so much from an increase in the firearm\x=req-\ related death rate, which has remained relatively stable for the past 15 years, as from a steady decrease in the death rate from motor vehicle injuries.2 ...

Problem statement: Causality among events, more formally the causal ordering relation, is a powerful tool for analyzing and drawing inferences about distributed systems. The knowledge of the causal ordering relation between processes helps designers and the system itself solve a variety of problems in distributed systems. In distributed algorithms design, such knowledge helped ensure fairness a...

In this paper, we propose an efficient geo-routing aware MAC protocol (GOAL) for underwater acoustic networks. It smoothly integrates self-adaptation based REQ/REP handshake, geographic cyber carrier sensing, and implicit ACK to perform combined channel reservation and next-hop selection. As a result, it incorporates the advantages of both a geo-routing protocol and a reservation-based medium a...

An important problem in line tranaec\"'ia1iitillin. i. t.ba"t objects or point •. :..':; ',;,. ":':...; ..... ..; .';::"..~:. :..r..:.:...:,:.,,:: ..;.:...... ';,.:':":::'=:;.: ~,," , . clusters of objects of different m.fI. have .ditt~req~:JlicllfJng probabilities. In a recent paper Drummer and McDonsld (1987) develop a bivariate sighting function. Their function is dependent.-on·1erPendic~lar...