Toronto Metropolitan University Open Journals
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Calculation Method for Determining the Dependence of the Torque on the Engine Shaft on the Amount of Injected Fuel
No full textThis article is devoted to the search for a calculation method for determining the physical work of a car in transport operations for certain technical characteristics of cars. As usual, the manufacturer provides the engine, transmission, chassis and general characteristics of the vehicle. These parameters are sufficient to determine the physical transport characteristics and energy efficiency of the vehicle in standard test locations, as well as under specific operating conditions. The article analyzes the determination of the amount of torque on the engine shaft of transport and technological machines with an electronic control system based on the amount of injected fuel. Comparative methods of engine power utilization factors, the influence of road parameters on the amount of injected fuel, and methods for determining vehicle operation are analyzed.
The determination of the magnitude of torque on the engine crankshaft depending on the amount of fuel has been studied
Change of Carbon Oxide Gas Emitted from Vehicles in Tashkent City Streets at Different Air Temperatures
No full textIn this article, to study the changes in the amount of exhaust gases emitted by motor vehicles on the streets of Tashkent city, the amount of traffic at junctions and intersections is determined and changes in carbon monoxide (CO) gas, which constitutes the main part of exhaust gases emitted by motor vehicles, in different climatic temperatures, the dependence on the amount and content of movement was analyzed
Development of the Algorithm of Additional Cooling Process for Oil Power Transformers with ONAN Cooling System
No full textThe article discusses the issues of developing an algorithm for additional cooling of oil power transformers with an ONAN cooling system. Expressions of dependence on the additional cooling process were obtained based on the law of conservation of energy and the law of conservation of mass, Taylor\u27s series, heat transfer processes, and Newton\u27s laws of cooling. Based on these obtained expressions, the developed algorithm allows determining the sequence of methods based on reducing the temperature of oil power transformers by cooling them, increasing the operational reliability and viability
Evaluation of Turbulent Combustion Models for Supersonic Combustion
No full textThe increasing interest in scramjet for propulsion, coupled with the complexity of experimental investigations, has led to a wide use of numerical methods for their design and development. The present work focuses on four different combustion models, namely the Eddy Dissipation Model (EDM), the Finite Rate/Eddy Dissipation Model (FREDM), the Eddy Dissipation Concept Model (EDC), and the Flamelet Model for simulation of supersonic flow. These models are tested in the DLR scramjet configuration. The Finite Volume Method (FVM) is employed along with the Reynolds Averaged Navier-Stokes (RANS) approach for turbulence modeling. The velocity and temperature profiles obtained are compared with the experimental data. All four combustion models show satisfactory agreement with the experimental values. However, among these models, the Flamelet model shows slightly better performance
Advancements in Solar Thermochemical Reactors for Sustainable Hydrogen Production
No full textThis thesis explores the promising advancements in solar thermochemical reactor technology for sustainable hydrogen production. Beginning with an overview of hydrogen\u27s role as a clean energy carrier and the importance of sustainable production methods, the thesis delves into the principles and potential of solar thermochemical reactors. It discusses recent research on reactor design, materials science, and integration with renewable energy systems, highlighting the technical challenges, economic barriers, and environmental considerations. Through a comprehensive analysis of current research projects, case studies, and future prospects, this thesis underscores the pivotal role of solar thermochemical reactors in advancing towards a sustainable energy future
CFD Analysis of Air in A Solar Dryer for Fruits and Vegetables
No full textThis study evaluates the CFD analysis of the thermal parameters of a solar dryer for fruits in the climatic conditions of Uzbekistan. It has traditionally been thought that agricultural products are stored in direct sunlight, as most farmers may be dependent on electricity from the national grid and cannot afford advanced technology. Recent studies have shown that alternative methods of direct sun exposure are preferable for vitamin preservation. For these purposes, a simulation of the design of a solar box for temperature distribution based on direct solar radiation of 800-1000 W/m2 in Tashkent (41.3288280 latitude, 69.2925760 longitude) is presented. In this COMSOL Multiphysics model, the effects of air flow and solar radiation are mainly studied
Determination of the gas reducer resource of gas cylinder buses
No full textIn this article, breakdowns and malfunctions of the supply system elements of gas cylinder buses were studied andanalyzed. The determination of the resource was carried out on the example of the resource of gas reducers of busesoperated in the city of Tashkent through calculation methods based on the laws of distribution
Evolution of Hybrid Facilities in Central Asia
No full textThis article examines the relationship with water in Central Asia, focusing on Uzbekistan. Through extensive research, the authors explore how Central Asia\u27s climate influences cultural attitudes towards water conservation. Water scarcity is a global concern, prompting state-level actions in Central Asian countries, each with its unique cultural norms. The article analyzes efforts to preserve clean drinking water, promote rational usage, and cultivate a water-conscious culture, considering spiritual factors. Recent years have seen the implementation of various state programs and presidential decisions addressing these issues
Understanding “danger signs” in healthcare: A concept analysis
No full textIntroduction: Danger signs are specific indicators signaling potential serious or life-threatening health conditions, crucial for prompt intervention in healthcare settings. Recognizing these signs can be challenging due to variations in cultural perceptions and individual interpretations. Additionally, danger signs are context-dependent, requiring awareness and contextual analysis. This complexity is amplified when dealing with abstract or non-physical signs. Understanding and consistently applying the concept of danger signs is essential for effective healthcare delivery. Method: This paper utilized Walker and Avant\u27s eight-step concept analysis method, offering a systematic and structured approach for defining and understanding concepts. The method promotes clarity, precision, and thorough exploration of the concept\u27s relationships with others, enhancing comprehensive understanding within its context. Result: Conceptually, danger signs represent a broad array of indicators signaling potential harm or imminent risk. Through analysis, this paper defines danger signs operationally as objective, measurable cues that are context-dependent, indicating the presence of a potential negative outcome. Conclusion: This paper contributes to existing knowledge by identifying danger sign attributes, reducing ambiguity and facilitating clearer application in health specialties training. The enhanced clarity also allows for the development of more precise tools to assess competence in danger sign identification.
The aftermath: A secondary analysis of OECD countries’ healthcare system responses to COVID-19
No full textSeveral proponents believe a universal healthcare system might have allowed the United States to navigate the COVID-19 pandemic more effectively, potentially leading to less devastating outcomes. Yet, comprehensive studies assessing this assertion on an international scale across multiple pandemic phases are sparse. This study evaluates the COVID-19 response efficacy in OECD countries, contrasting single-payer with multiple-payer healthcare frameworks. Data from different pandemic phases through to October 2023, suggest a single-payer system correlate with reduced death rates, diminished excess mortality, and overall lower cumulative excess mortality. Notably, among the high-income OECD nations, the U.S. ranks lowest in pandemic response. Such findings underscore the significant impact of disparities in healthcare access. Essentially, these inequities can debilitate a healthcare infrastructure to the extent that it lags nations with similar socio-economic, demographic, and health profiles.