18 research outputs found
Investigation of corrosion reduction in turbine blades of thermal power plant using nanomaterials
No full textThe current study aim to reduce the corrosion issues in steam turbine for Al-Mussaib
thermal power station. In order to gain the aim of the study, the methodology of the works
divided into three parts, experimental, numerical models and mathematical models parts.
The experimental part was conducted by take a sample from exist broken steam turbine
blade to identify the alloy composition and preparing samples with exact composition by
powder metallurgy method, then using electrodeposition method to coat the prepared
samples by three different coating composite materials consists of TiO2 in different ratios
(5, 10 and 15)% and 5 % SiO2. To verify the efficiency of coating several tests were
conducted as (surface roughness, hardness, wear, and oxidation test).
While the numerical analysis was done by ANSYS software program to investigate the
effect of coating thickness for the selected coating materials (Ti, TiO2 and SiO2) on the
steam turbine. The numerical analysis done using six coating groups, three of them
consists of single materials (Ti, TiO2 and SiO2) and the other three consists of hybrid
coating (Ti+ TiO2, Ti+ SiO2 and Ti+TiO2+SiO2) and each group has three coating
thickness (0.01, 0.02 and 0.04) μm. Finally, do mathematical model by Engineering Equation Solvers (EES) to identify the
changing in the energy efficiency of the steam turbine before and after coating. The
obtained results indicated that increasing the TiO2 from (5 to 15)% lead to increase the
coating thickness, which compatible with increasing the surface roughness. As well as the
sample hardness increased after coating and this increasing return to increasing TiO2
amount from 5 to 15%. However, wear resistance for the samples after coating by selected
coating composite and 10 % TiO2 amount records the highest reduction in the wear of
sample. Numerical analysis results indicated that the total heat flux and temperature was
increased after applying coating, while total deformation for all selected groups was
decreased after applying coating for all of them the changing in the coating thickness from
(0.01 to 0.04) μm has no effective changes on the samples after coating
Sustainable heating system by infrared radiators
No full textMaintaining the optimum temperature in the living quarters is the key to a comfortable stay. Due to the lack of a central heating system or in the event of its insufficiency, they resort to the installation of additional heat sources. There is a wide range of devices on the market with different operating principles, hence the difficulty of which is better - a convector or infrared heater. A comparative analysis of devices will help you make the right choice. Asking the question of which is better a convection heater or an infrared heater, one must decide on its role in heating the house. It is better to use them as additional equipment with an existing heating system. One of the effective sources of additional heating are infrared radiators. Its principle of operation is based on infrared radiation, which provides a quick and qualitative increase in temperature in any part of your apartment. Today, more and more people prefer infrared radiators. From the usual electric convector, they differ in that they heat not the air in the room, but hard surfaces (floors, walls) and objects, and these, in turn, leak heat into the surrounding space. So, the entire room is heated up unnoticeably
Sustainable heating system by infrared radiators
No full textMaintaining the optimum temperature in the living quarters is the key to a comfortable stay. Due to the lack of a central heating system or in the event of its insufficiency, they resort to the installation of additional heat sources. There is a wide range of devices on the market with different operating principles, hence the difficulty of which is better - a convector or infrared heater. A comparative analysis of devices will help you make the right choice. Asking the question of which is better a convection heater or an infrared heater, one must decide on its role in heating the house. It is better to use them as additional equipment with an existing heating system. One of the effective sources of additional heating are infrared radiators. Its principle of operation is based on infrared radiation, which provides a quick and qualitative increase in temperature in any part of your apartment. Today, more and more people prefer infrared radiators. From the usual electric convector, they differ in that they heat not the air in the room, but hard surfaces (floors, walls) and objects, and these, in turn, leak heat into the surrounding space. So, the entire room is heated up unnoticeably
Measuring radiation in space with bubble detectors and the effect of radiation on health system of human body
No full textA bubble detector resembles a testing tube or a human fingertip in size and form. It has a material with small liquid droplets in it. When neutrons collide with the droplets, visible bubbles of trapped gas appear almost instantly. The number of bubbles in the surrounding neutron radiation may be measured optically or with a reader, and the number of bubbles reflects the degree of neutron radiation. The gas bubbles may be compressed again and used again. A bubble detector becomes a radiation sensor utilized to assess neutron levels. Neutrons account for 30 percent of the radiations that astronauts encounter in orbit. When protons collide with a spacecraft's shielding, neutrons are produced. To better monitor specific astronauts' neutron exposures throughout space missions, the Canadian Space Agency's Operation Space Medicine (OSM) Group is sponsoring the development of a personal detector device for space usage depending on Canadian bubble dosimeter technology. The current study focuses on mechanisms utilized for detecting radiation, Neutron detectors, and kinds of Neutron detectors, in addition to the effect of radiation on the health system
Reducing oil pipes corrosion by (ZN-NI) alloy coating on low carbon steel substrate by sustainable process
No full textThe problem of corrosion is quite risky and costly. There is always the possibility of bridges and buildings collapsing, oil pipelines bursting, chemical plants leaking, and bathroom flooding. Corroded medical implants might result in blood poisoning, corroded electrical connections could start fires and cause other problems, and worldwide air pollution could damage artwork. Corrosion threatens the safe disposal of radioactive waste that should be stored in containers for millennia. This study makes an effort to enhance further the electroplated layer's (Zn-Ni) alloy characteristics. In this study, samples of low-carbon steel are electrodeposited with layers of varying thicknesses of (Zn-Ni) from an alkaline solution throughout various coating times (15, 30, and 60 minutes). The mechanical and corrosion characteristics of the electrodeposits layer are determined using X-ray fluorescence (XRF), which is also utilized to analyse the microhardness and corrosion test results of the (Zn-Ni) deposited layer
Numerical simulation for effect of composite coating (TIO2+SIO2) thickness on steam turbine blades thermal and stress distribution
No full textThe steam turbine is the most effective and straightforward method of converting thermal energy into mechanical power. As steam expands, its velocity increases, exerting strong stresses on the turbine blades. The linear motion of the incoming steam with high temp and pressure is converted to rotation of the turbine shaft by the turbine blades. The most important issue in power plants might be corrosion in the turbine blades. Corrosion might cause turbine blade masses to be out of balance, which can cause major vibration issues. The ANSYS software program did a numerical analysis to investigate the impact of coating thickness for the selected coating materials (Ti, TiO2, and SiO2) on the steam turbine. The numerical analysis was done using six coating groups; three of them consist of single materials (Ti, TiO2, and SiO2), and the other three consist of hybrid coating (Ti+ TiO2, Ti+ SiO2, and Ti+TiO2+SiO2) and each group has three coating thickness (0.01, 0.02 and 0.04) μm. Numerical analysis results indicated that the total heat flux and the temp increased after applying the coating. In contrast, total deformation for all selected groups was decreased after applying a coating for all of them; the change in the coating thickness from (0.01 to 0.04) μm has no effective changes on the samples after coating. Using (Ti and TiO2) show a significant increase in max principal stress compared to the uncoated sample. The application of Ti shows the impact of coating thickness on max principal stress, where a change in the coating thickness from 0.01 to 0.04 μm leads to a reduction in the max principal stress value from 1421.9 to 1211.4 MPa
Electronic waste governance: sustainable solutions to a global dilemma
No full textLe présent mémoire a pour objet les formes, les caractéristiques et les défis de la gouvernance des déchets électroniques. L’auteure explore les impactes socioéconomiques et environnementales de divers types d’instruments conçus pour mitiger les risques à la santé humaine et à l’environnement que présentent les produits électroniques en fin de vie, notamment: les traités multilatéraux qui visent à prohiber le transfert des déchets hasardeux au pays en développement, les législations régionales, nationales et provinciales mettant en vigueur des systèmes de recyclage obligatoire des déchets électroniques, ainsi que d’autres initiatives, publics et privées, basées sur le principe de la responsabilité élargie des producteurs (REP). L’objectif de ce travail est de comprendre comment les acteurs impliqués dans le commerce de l’équipement électronique peuvent modeler les systèmes de production, d’usage et du traitement fin de vie des technologies
contemporaines pour que ces dernières puissent continuer à faire élever les standards de vie et à avancer le développement des communautés humaines, en respectant simultanément le principe international de l’équité globale, l’environnement naturel et la qualité de vie des générations futures.This thesis addresses the forms, characteristics and challenges of electronic waste governance. The author explores the socio-economic and environmental impacts of a diverse range of instruments that have been developed to mitigate the human health and environmental risks presented by end-of-life electronic equipment, namely: multilateral treaties restricting e-waste trade flows into developing countries, regional, national and provincial legislations imposing mandatory recycling systems for e-waste, as well as other public and private initiatives based on the principle of extended producer responsibility (EPR). The objective of this study is to understand how stakeholders implicated in the electronic equipment sector can model the systems of production, use, and discard of electronics, so that the latter may continue to raise living standards and propel human development while simultaneously respecting the international principle of global equity, the natural environment and the quality of life of future generations
Electronic waste governance: sustainable solutions to a global dilemma
No full textLe présent mémoire a pour objet les formes, les caractéristiques et les défis de la gouvernance des déchets électroniques. L’auteure explore les impactes socioéconomiques et environnementales de divers types d’instruments conçus pour mitiger les risques à la santé humaine et à l’environnement que présentent les produits électroniques en fin de vie, notamment: les traités multilatéraux qui visent à prohiber le transfert des déchets hasardeux au pays en développement, les législations régionales, nationales et provinciales mettant en vigueur des systèmes de recyclage obligatoire des déchets électroniques, ainsi que d’autres initiatives, publics et privées, basées sur le principe de la responsabilité élargie des producteurs (REP). L’objectif de ce travail est de comprendre comment les acteurs impliqués dans le commerce de l’équipement électronique peuvent modeler les systèmes de production, d’usage et du traitement fin de vie des technologies
contemporaines pour que ces dernières puissent continuer à faire élever les standards de vie et à avancer le développement des communautés humaines, en respectant simultanément le principe international de l’équité globale, l’environnement naturel et la qualité de vie des générations futures.This thesis addresses the forms, characteristics and challenges of electronic waste governance. The author explores the socio-economic and environmental impacts of a diverse range of instruments that have been developed to mitigate the human health and environmental risks presented by end-of-life electronic equipment, namely: multilateral treaties restricting e-waste trade flows into developing countries, regional, national and provincial legislations imposing mandatory recycling systems for e-waste, as well as other public and private initiatives based on the principle of extended producer responsibility (EPR). The objective of this study is to understand how stakeholders implicated in the electronic equipment sector can model the systems of production, use, and discard of electronics, so that the latter may continue to raise living standards and propel human development while simultaneously respecting the international principle of global equity, the natural environment and the quality of life of future generations
Study the effect of adding zirconia particles to nickel-phosphorus electroless coatings as product innovation on stainless steel substrate
No full textScholars have spent much time studying metal deposition procedures involving the deposition of elec-troless nickel, alloy, and composite coatings on various surfaces; the most current uses were feasible advantages of the coatings' many good properties for achieving the final product innovation. Lately, these coatings have demonstrated intriguing wear and corrosion resistance features, resulting in several innovative macro-level developments. The notion of composite coating by co-deposition coating has been presented in this article. The characteristics of Ni-Pb alloy coatings were examined by inserting particles into the electroless deposited solution. The stainless steel (SS) specimens have been electro-less coated with Ni-Pb and ZrO2 nanoparticles (size = 30-70 nm) at 0, 10, and 20 g/L amounts. The materials have been examined using scanning electron microscope and atomic force microscope, followed by wear-resistant and microhardness testing. According to the investigation findings, including inert particles improved the hardness magnitude and wearing resistance considerably. The base metal exhibited the highest wear rate at 10 N, while the-wear rate decreased in the Ni-Pb-ZrO2-coated SS316L by 34%. The Vickers hardness magnitudes of the Ni-Pb-ZrO2-coated samples at different ZrO2 contents (0,10, and 20 g/L) were 19, 50, and 81%, respectively
Ashes, War, and a Broken Earth: The Systemic Role of Education in Fantasy Literature
No full textBuilding on fantasy literature's origins as social commentary, this project aims to increase the scholarly relevance of such literature by highlighting its applicability to actual-world systems through world-building. Drawing on education's power as a social system, this paper explores the collapse of educational institutions in Sabaa Tahir's An Ember in the Ashes series, R.F. Kuang's The Poppy War trilogy, and N.K. Jemisin's The Broken Earth trilogy. The author adapts possible worlds theory into a theory of "parallel worlds," arguing that the ramifications of these collapses reveal the power of educational institutions in resisting or upholding oppressive systems in the actual world. Ultimately, autonomous high fantasy worlds act as as case studies for the actual world in which educational institutions are so pivotal to society that their power cannot be disregarded. If educational spaces are not actively advocating for liberation, they are by default upholding oppressive systems.Bachelor of Art
