891 research outputs found
Optimization of a dual fuel engine based on multi-criteria decision-making methods
Get PDFThe transportation sector's need for new fuels is being addressed through the development of optimization methods, and the use of combined and alternative fuels, which will prove to be both efficient and cost-effective. This paper utilizes a multi-criteria approach, including the response surface method and Taguchi method, to evaluate several alternative fuels for a heavy-duty diesel engine. The study considers a midterm horizon to address the issue of the near future. For this purpose, the economic effects and optimization of a natural gas and diesel fuel combination were evaluated. The optimization results showed that the engine operated best at a constant speed of 1400 rpm. The results indicate that when modeling combustion emissions with RSM, the effects of CO and NOx must be considered. When determining the optimal level of variables, it is important to increase the interval between the compression ratio and the start time of fuel injection until a specific level of emission reduction is achieved. Furthermore, Taguchi method has demonstrated that the impact of alterations in gas fuel and injection start time on the modeling of emission and performance parameters is more significant than that of other variables. The TOPSIS method was used to determine the economic, functional, and emission performance of different engine operation processes, it was found that the economic and functional criteria were aligned. However, the best solution for the environmental criterion was to focus on management
Phase change material mixed with chloride salt graphite foam infiltration for latent heat storage applications at higher temperatures and pressures
Get PDFIn the address layer of energy systems, the infiltration of phase-change material (PCM) into composite metals can be used. In this study, infiltration technology was developed with simultaneous pressure and vacuum in graphite foam. The vacuum pump was used to create porosity during the melting and infiltration process in the composition of PCM pellets. Easy construction, stainless steel, and PCM's corrosion-resistant function deliver a Cost-efficient and simple process development. The goal of this analysis is to examine the properties of PCM using a mixture of materials such as salts and chloride salts with graphite foam. High energy storage density Chloride-based PCM was used at 355 degrees C. The energy-dispersive spectroscopy and Scanning electron microscopy analysis were used to assess the successful existence of the phase of infiltration to test the PCM composite and material compounds. A laser thermal flash conductivity meter was used to evaluate the infiltrated sample thermal conductivity. An infiltration performance of more than 92% of the porosity usable has been reached. The sample thermal conductivity is proven to be more robust Factor more than 45 times pure chloride PCM. Low-cost infiltration demonstrated effectiveness and Infiltrated PCM repeatability may be a milestone for the third generation of supercritical carbon dioxide energy cycle applications in concentrating solar power plants
Strategic optimization of dual-fuel diesel/gas engines by numerical approach for environmental and economic benefits
No full textThe study introduces a framework for optimizing eco-friendly dual-fuel engines, combining CFD and ANN, to reduce carbon emissions and improve sustainable transportation.We achieved optimal performance with a 52–65 % NG substitution ratio. SOI timing had a big effect on NOx emissions; later injection decreased NOx formation because it made the mixture more homogeneous. We developed a radial basis function neural network model to predict engine performance and emissions with 99 % accuracy. The study examines the effect of fuel droplet spraying on cylinder walls on engine performance and emissions, utilizing response surface methodology to create engine maps. Numerical experiments revealed that a lowered natural gas replacement ratio of less than
50 % resulted in decreased flame propagation and the attainment of a burn mixture mode. The decrease in flame propagation speed during CA10 led to a fivefold increase in CO emissions. As the NG substitution ratio exceeded 50 %, the air/fuel ratio neared equilibrium, resulting in a reduction in NOx emissions and in-cylinder combustion temperature. Nevertheless, the highest RoHR level decreased by 25 %. The downward trend proceeded until the
natural gas substitution ratio reached to 90 %. The TOPSIS method was utilized to identify optimal operating conditions for DFDI engines, offering valuable insights for efficiency and emissions reduction
Philosophy and language in the Islamic world Philosophy in the Islamic world in context ;, 2./ edited Nadja Germann; Mostafa Najafi.
No full textIncludes bibliographical references and indexes.What is language? How did it originate and how does it work? What is its relation to thought and, beyond thought, to reality? Questions like these have been at the center of lively debate ever since the rise of scholarly activities in the Islamic world during the 8th/9th century. However, in contrast to contemporary philosophy, they were not tackled by scholars adhering to only one specific discipline. Rather, they were addressed across multiple fields and domains, no less by linguists, legal theorists, and theologians than by Aristotelian philosophers. In response to the different challenges faced by these disciplines, highly sophisticated and more specialized areas emerged, comparable to what nowadays would be referred to as semantics, pragmatics, and hermeneutics, to name but a few ? fields of research that are pursued to this day and still flourish in some of the traditional schools. Philosophy of language, thus, has been a major theme throughout Islamic intellectual culture in general; a theme which, probably due to its trans-disciplinary nature, has largely been neglected by modern research. This book brings together for the first time experts from the various fields involved, in order to explore the riches of this tradition and make them accessible to a broader public interested both in philosophy and the history of ideas more generally.1 online resource (360 pages
A novel approach of synchronization of the sustainable grid with an intelligent local hybrid renewable energy control
Get PDFEnergy management, emission reductions, and sustainable development are directly linked. The use of renewable energy and intelligent control systems serves two goals: sustainable development and energy supply. In this paper, we propose an improved intelligent hybrid renewable energy management system to utilize local renewable energy. The penetration of renewable energy in this study starts from 20 and 50% and reaches 100%. The innovation of this research is the use of a dynamic decision algorithm in an intelligent system microcontroller that can determine the maximum possibility of hybridization of local solar and wind energy sources and optimize the electricity demand of the residential unit. The results show that the proposed control strategy in the first scenario, with average daily fuel consumption of 1.11 L, the total energy produced by the hybrid renewable energy conversion system is equal to 1697 kWh/year, and the NPV is 341.47 and IRR is equal to 19.5% with a ROI of 17.61 years. In the third scenario, the energy production of the system was equal to 1933 kWh/year with NPV equal to - 372.9 dollars and IRR equal to 15.08%. The intelligent power control system received the electricity generated by the renewable energy subsystems and provides the electricity needed by the green cottage based on the proposed decision algorithm
Sustainable Design of a Near-Zero-Emissions Building Assisted by a Smart Hybrid Renewable Microgrid
Get PDFRenewable energy regulations place a premium on both the use of renewable energy sources and energy efficiency improvements. One of the growing milestones in building construction is the invention of green cottages. Building Integrated Photovoltaic (BIPV) technologies have been proved to aid buildings that partially meet their energy demand as sustainable solar energy generating technologies throughout the previous decade. Curved facades provide a challenge for typical photovoltaics. This study designed, produced, and assessed elastic solar panels supported by flexible photovoltaic systems (FPVS) on a 1 m2 layer. The LabVIEW program recognizes and transmits online data on warm and dry climates. The fill factor was 88% and 84%, respectively, when installed on the silo and biogas surfaces. The annual energy output was 810 kWh on a flat surface, 960 kWh on a cylindrical surface, and 1000 kWh on a hemisphere surface. Economic analysis indicates that the NPV at Flat surface is 955.18 increase. For cylindrical and hemispheric buildings, the investment yield was 39.29% and 40.47%, respectively. A 20% increase in fixed investment boosted the IRR by 21.3% in the flat system. While the cylindrical system had a 25.59% raise, the hemisphere saw a 24.58% gain
sj-docx-2-aan-10.1177_02184923211045915 - Supplemental material for The effect of pulsatile versus non-pulsatile flow during cardiopulmonary bypass on cerebral oxygenation: A randomized trial
No full textSupplemental material, sj-docx-2-aan-10.1177_02184923211045915 for The effect of pulsatile versus non-pulsatile flow during cardiopulmonary bypass on cerebral oxygenation: A randomized trial by Samira Moosaeifar, Mostafa Mousavizadeh and
Tahereh Najafi Ghezeljeh, Afshin Hosseinian, Touraj Babaee, Saeid Hosseini, Carlos – A. Mestres in Asian Cardiovascular and Thoracic Annals</p
Exergy and Energy Analysis of Organic Rankine Cycle Integration in the Carbon Black Industry using Pinch Technology
Get PDFIndustrial Carbon black production is a petrochemical process that has high level of waste heat and emissions. Main points of CB process include furnace and stack lines. Also, the use of different feedstocks can be effective in level of waste heat and amount of emission pollutants. So the main objective of this research use from the pinch technology in CB process in order to minimize the level of waste heat by utilization of waste heat recovery (WHR) applications for power generation. By numerical investigation and modelling of WHR in furnace and stack points, can be defined best location for power generation in CB process. Moreover, through the analysis of Organic Rankine Cycle (ORC) systems integrated with WHR from both energy and exergy perspectives, second target to enhance their thermal efficiency. The results indicate that the presence of blowers on stacks leads to an increase in RoHR and RoHC. In order to determine the optimal location for power generation cycle installation, an ORC energy and exergy analysis was conducted. The results showed that the energy and exergy values at the SLC stack were higher than those at the HLC point. Also, numerical results showed the points that have suitable thermal efficiency and rate of exergy of WHR where have higher temperature gradient than other points. So SLC ( ExWHR = 166.7kW) and HLC ( ExWHR = 136.1kW) stacks integrated with blower are the optimal location for WHR utilization in the CB production process
sj-doc-1-aan-10.1177_02184923211045915 - Supplemental material for The effect of pulsatile versus non-pulsatile flow during cardiopulmonary bypass on cerebral oxygenation: A randomized trial
No full textSupplemental material, sj-doc-1-aan-10.1177_02184923211045915 for The effect of pulsatile versus non-pulsatile flow during cardiopulmonary bypass on cerebral oxygenation: A randomized trial by Samira Moosaeifar, Mostafa Mousavizadeh and
Tahereh Najafi Ghezeljeh, Afshin Hosseinian, Touraj Babaee, Saeid Hosseini, Carlos – A. Mestres in Asian Cardiovascular and Thoracic Annals</p
Interview with Mostafa Moharram
No full textهذه المقابلة مع المؤلف والسيناريست المصري مصطفى محرم. يستعرض كتاباته وأفلامه ، ويؤكد على أهمية السيناريو والكتابات المتخصصة . يشرح دور كاتب السيناريو وهو المسؤول عن خلق عمل فعال وجيد ، وكذلك التعامل بطريقة جيدة مع فريق التمثيل . أجرت المقابلة درية شرف الدينIn this interview, Egyptian author and screenwriter Mostafa Moharram speaks about his movies and the importance of scenarios in creating good work. The interview was conducted by Dorreya Sharaf al-Din
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