this paper presents a new control method for a three-phase four-wire unified power quality conditioner (upqc) to deal with the problems of power quality under distortional and unbalanced load conditions. the proposed control approach is the combination of instantaneous power theory and synchronous reference frame (srf) theory which is optimized by using a self-tuning filter (stf) and without us...

let r be a ring, m a right r-module and (s,≤) a strictly ordered monoid. in this paper we will show that if (s,≤) is a strictly ordered monoid satisfying the condition that 0 ≤ s for all s ∈ s, then the module [[ms,≤]] of generalized power series is a uniserial right [[rs,≤]] ]]-module if and only if m is a simple right r-module and s is a chain monoid.

this paper argues for a broader emphasis on sustainable security and smart power, for examining both opportunities as well as threats to security. sustainable security is a new concept in the security studies. deep attention to all possible threats against human life is necessary for continuation of security in a sustainable and dynamic base. this aim can be achieved in a highest level by mergi...

some geothermal reservoirs have temperatures below boiling point and therefore natural steam can not be produced for power generation. refrigerant power cycles may be then employed to recover low temperature heat. in this article study is made of the power cycles of six different relligrants and most suitable refrigerants for this purpose are suggested

background there is an interest in finding new and safe antioxidants from natural sources such as medicinal plants. objectives the aim of this study was to evaluate the antioxidant activity of ten iranian medicinal plants extracts. materials and methods for antioxidant activity, the radical scavenging activity, reducing power and phenolic contents of ethanol plant extracts were determined. gall...

in this paper, the output power behavior of the wave-guide cw-co2 laser versus efficient parameters of laser performance was investigated. the output power variation versus the discharge current, the pressure and the gas mixture ratio was studied and optimized. the maximum output powers of 6 and 14.5 w were respectively obtained at operating pressures 78 and 50 mbar in two tubes of 3 mm same di...

Renewable energy facilities will constitute a major contribution to electrical power in the future. The wind turbine will, together with biomass, form the major renewables parts up to year 2030 including erection of offshore wind farms. The wind is a non-storable energy source, whose electric energy needs priming into interchangeable energy to be competitive for large-scale power generation. An...

Background and Objectives: In this paper, a new design strategy was proposed in order to enhance bandwidth and efficiency of power amplifier. Methods: To realize the introduced design strategy, a power amplifier was designed using TSMC CMOS 0.18um technology for operating in the Ka band, i.e. the frequency range of 26.5-40GHz. To design the power amplifier, first a power divider (PD) with a ver...

With regard to the importance of scientific decision-making in power plants prioritization to produce electrical energy (power) from renewable energies (purified), in this paper, research with specialists opinions with respond to questionnaires provided upon three efficient operational criterion in position of three presented power plant in country which used wind, solar water energies for prod...