Background: There have been growing concerns about environmental pollution and public health issues associated with metal(loid)s and radionuclides. As a baseline for monitorisation, radioactivity and specific metal(loid) levels have been measured to investigate the estimated environmental health risks in Igdir province at the Turkish side of the border, in the vicinity of the Metsamor Nuclear P...

For portable computing devices, maximizing battery lifetime or performing maximum possible operations per recharge is a primary objective. Various voltage and frequency scaling techniques are being used in commercial devices. This work considers the role of energy source, i.e., battery, in the optimization of a portable system. We introduce battery lifetime in number of clock cycles as an optim...

Wireless sensor nodes are typically powered by non-rechargeable batteries and deployed in an area of interest to supervise or monitor various phenomena (temperature, pressure, humidity...). So, constrained energy is the most important feature of wireless sensor networks (WSNs). In WSNs, saving energy and extending network lifetime are great challenges. Clustering is a key technique used to opti...

This study investigates the causal relationship between clean and non-clean energy consumption and economic growth in Brazil over the period of 1980–2009. Clean energy consumption at aggregated level of total renewable energy consumption and disaggregated levels of hydroelectric, new renewables, and nuclear energy consumption are tested within a production function framework. A cointegration te...

a simple semi-phenomenological model, which accurately predicts the dependence of thresholdcurrent for temperature of resonant-phonon three well quantum cascade laser based on verticaltransitions is offered. we found that, the longitude optical phonon scattering of thermally excitedelectrons is the most important limiting factor for thermal performance of high frequency thz qcls.in low frequenc...

This research work is carried out to study wireless sensor networks (WSNs) are composed of many stumpy cost, little power devices with sensing, local processing and wireless communication capabilities. Minimizing energy dissipation and maximizing network lifetime are important issues in the design of routing protocols for sensor networks. The clustering algorithms are a kind of key technique us...

Target coverage is one of the important problems in visual sensor networks. The coverage should be accompanied with an efficient use of energy in order to increase the network lifetime. In this paper, we address the maximum lifetime for visual sensor networks (MLV) problem by maximizing the network lifetime while covering all the targets. For this purpose, we develop a simulated annealing (SA) ...