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The paper presents a research hybrid systems (hydrogen-photovoltaic) for a mobile phone station in an area far from the network or can be mobile in a desert area. This study investigates and design a renewable energy-based energy system for a mobi le phone station. The proposed energy system includes of the following main components: photovoltaic panels, fuel cells, water analyzer and batteries, as well as a diesel generator.
This research focuses on the use of new materials have the ability to act as an anti-corrosion for the resolution of problems relating to electrodes analyzers the production of hydrogen. Especially that most analyzers based on the use of electrodes are expensive.
Background and Aim : Retention between composite and fiber post is still below the acceptable level when compared with the retention between composite and dental structure. This study aimed to evaluate the effect of H2O2 as a chemical solution to imp rove the mechanical connection between fiber post and composite core. Materials and Methods:45 glass fiber posts and 45 quartz fiber posts were prepared. The specimens were randomly distributed into 3 subgroups, including application of silane (S) , etching with H2O2 10% for 20 minutes(H1) , etching with H2O2 20% for 10 minutes (H2). composite core was placed. Shear bond strength values of posts and composite resin cores were measured using a mechanical test machine (Instron). data were analyzed Statistically . Results :There were significant differences between the shear bond strength for (H1,H2) And (S) in quartz groups only (P<0.05). There was no significant difference between glass and quartz groups (P>0.05). Conclusions:The surface treatment of quartz fiber posts with H2O2 significantly enhanced the shear bond strength of the composite core. Application of H2O2 to the Glass fiber post surfaces was not effective.
It is known that, the available power from a photovoltaic system is unpredicted and differs with climatic changes, so it has an intermittent nature, in other words it is unable to supply the load continuously and steadily. Because of that, storage methods of its energy must be studied to use it again in a way that could be predicted. Hydrogen production is one of these methods by connecting the PV system to water electrolysers, and this stored hydrogen could be used either in fuel cells or burning it to get thermal energy. This study focuses on PV system and the available energy taken from it, and the electrolysers and its requirements and products. Making a mathematical model would be done and plotting the curves that represent the system by programming it using MATLAB. A simple numeral example that clears the system would be calculated. By this way, the energy efficiency would be between 23 to 67 % according to the way the produced hydrogen is used.
The integration of various renewable energy sources as well as the liberalization of electricity markets are established facts in modern electrical power systems. The increased share of renewable sources within power systems intensifies the supply variability and intermittency. Therefore, energy storage is deemed as one of the solutions for stabilizing the supply of electricity to maintain generation-demand balance and to guarantee uninterrupted supply of energy to users. In the context of sustainable development and energy resources depletion, the question of the growth of renewable energy electricity production is highly linked to the ability to propose new and adapted energy storage solutions. Recent advancements in hydrogen technologies and renewable energy applications show promise for economical near to conversion to a hydrogen-based economy. As the use of hydrogen for the electric utility and transportation sectors. This paper briefly discusses provides a historical perspective for hydrogen production and the role of hydrogen as an energy carrier, discusses hydrogen economy, the process of electrolysis for hydrogen production (especially from solar and wind technologies). A comprehensive techno/socio/economic study of long term hydrogen based storage systems in electrical networks is addressed. the excess produced hydrogen during high generation periods or low demand can be sold either directly to the grid owners or as filled hydrogen bottles. The affordable use of Hydrogen-based technologies for long term electricity storage is verified. The results indicate that ample resources exist to produce Hydrogen from wind and solar power. However, hydrogen prices are highly dependent on electricity prices.
This study dealt with the determination of hydrogen sulfide concentrations in the sediments and water of sewage points on the beach of Lattakia city - the southern Corniche region, which witnesses a clear flow of sewage water and the effect of bacter ia on the emission of hydrogen sulfide (H2S) of high toxicity to the water medium and from it to the air and seasonal changes. These emissions and the role of hydrological factors such as salinity, acidity and temperature in this process.
Solar Energy and Hydrogen are possible replacement options for fossil fuel, But a major drawback to the full implementation of solar energy, in particular photovoltaic (PV), is the lowering of conversion efficiency of PV cells due to elevated cell t emperatures while in operation. Also, hydrogen must be produced in gaseous or liquid form before it can be used as fuel; but its‟ present major conversion process produces an abundance of carbon dioxide which is harming the environment through global warming. In search of resolutions to these issues, this research investigated the application of Thermal Management to Photovoltaic (PV) modules in an attempt to reverse the effects of elevated cell temperature. The investigation also examined the effects of the thermally managed PV module to a Electrolyzer (Hydrogen Generator) for the production of hydrogen gas in an environmentally friendly way. The results of the investigation showed that the cooling system stopped the cell temperature from rising, reversed the negative effects on conversion efficiency, and increased the power output of the module by as much as 33%. The results also showed that the thermally managed PV module when coupled to the hydrogen generator impacted positively with an appreciablely increase of up to 26% in hydrogen gas production.
The present study aimed to investigate the capacity of biotin in preventing oxidative stress induced by hydrogen peroxide H2O2 at a concentration of 1% given with consumed drinking water to local male rabbits. 40 male rabbits aged 7-8 months, were used in this study and were divided randomly into four groups, with 10 rabbits within group, as follow: the first group was given standard forage and normal water and considered as control, the second group was given standard forage and 1% H2O2 in water, the third group was given standard forage and 200 mg biotin /kg body weight in water, the fourth group was given standard forage, 1% H2O2 and 200 mg biotin /kg body weight in water. All groups were treated daily for 8 weeks.
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