Imported fuels used up to 50% of Sri Lanka's export income and contributed the recent crippling energy crisis. This study explores possibility using island's indigenous renewable resources secure supply for power, heat, transport desalination sectors by year 2050. The costs, CO2 emissions land use requirements system transition pathways are examined. An model in technology-rich, hourly multi-region resolution was applied. In an entirely renewables-based system, cumulative cost 2050 is...

Non-woven polypropylene(PP) is the nonpolar polymer that widely used in mechanical engineering, manufacture of composite materials and medical equipment. It's available it's relatively inexpensive. The article devoted to study mechanical, electrical electret properties non-woven "Spunbond" polypropylene CC20, CC35, CC40 CC50, CC60, CC70, CC80, CC90, CC100. Here CC means grams per square meter (g/m2). stability state was studied by method thermoactivation spectroscopy. dependences...

This paper aims to present the development and improvement methodologies of wet-steam turbines in modern power plants by reducing erosion nozzle rotor blades. Technical features are high centrifugal force, blade rotating rate, dimensional flow, conditionally significant transient flow strength during low-load operations. System design thermodynamics wet steam turbine generations discussed. The results changes effective erosive energy for impact drops with different diameters on grooved...

This paper presents a hybrid gate controller using BLDC motor under dual power sources. At current scenario, is developed according to size and space for household or industrial activities. The focuses on the development of by motor. motors have very high switching frequency get acceleration gates.

Polypropylenes (PP) and polyimides (PI) are non-polar polar polymers widely used in mechanical engineering, manufacturing of composite materials medical equipment. The article is focused on the study electrical electret properties non-wovens "Spunbond" polypropylenes (CC20 - CC100) non-woven polyimides. Charge accumulation kinetics charge relaxations were tested analyzed for these materials. stability state was studied by method thermoactivation spectroscopy. dependences compensating...

Energy sources are planned to develop without hydrocarbons, which leads the accumulation of greenhouse gases in atmosphere fulfil obligations countries participating UN conference on climate change. The article considers possibility minimizing gas emissions Sri Lanka by 2035 at level electricity and heat production an amount sufficient for citizen's life support. Using results estimates island's demand future consider hypothetical scenarios development energy region, considering need cover...

Abstract The process of near-electrode polarization in a polyvinylidene fluoride (PVDF) film was studied using reverse currents I rev (t). It proven that the maxima on (t) curves are characteristic polarization. dependences reversal time were analyzed based various representations. mobilities intrinsic charge carriers and magnitude transferred through dielectric layer from electrode to calculated. conductivity PVDF temperature range 90°C-130°C.

The relaxation of homocharge polyimide films with different rigidity macromolecules was studied by thermal activation spectroscopy. We used laboratory R-BAPB, PMDA-ODA and DP-OTD. Using the method computer simulation, complex spectra thermally stimulated depolarization (TSD) currents are decomposed into individual elementary peaks, which described first-order kinetic equations. energies processes were determined. It has been shown that highest stability electret state is characteristic...

The results of the investigation dielectric characteristics thermoplastic polyimide R-BAPB and R-BAPS films are presented. absorption charging currents Ich(t) & TPI ranging temperature in between 20 °C- 200 °C for 5 hours constant electric field 2·105 V/m. experimental data were analyzed to correspond Voigt equivalent Maxwell's circuits. Main [permittivity ε'(ω), loss(tan δ), loss factor ε"(ω), active Za(ω) reactive Zc(ω) resistances] computed compared range frequencies from 10-4 10-1 Hz...

This paper presents a new surface for improving the nozzle blade C-9015A of wet-steam turbines in modern power plants by reducing erosion on with help parallel grooved surface. Moisture wet steam causes to wear out and even break blades over time. The can be decreased putting direction flow By placing nozzle, angle between impact droplets decreases. As drop decreases, energy also article discusses physics droplet different types surfaces movement water two-phase flow. Furthermore, finally,...

The results of the investigation electrical characteristics thermoplastic polyimide R-BAPB films are presented. absorption charging currents Ich(t) were measured experimentally in temperature range 25-150 °C for 3 hours. experimental data analyzed correspond to Voigt equivalent circuits. Main dielectrical ε' (ω) and ε"(ω) calculated low frequency according parameters Voigt's scheme.