Toronto Metropolitan University Open Journals
Not a member yet
1204 research outputs found
Sort by
Living, Feeling, Being Fat Together: Introduction to Special Issue of Excessive Bodies, Critical Fat Phenomenologies
No full textIntroduction to Volume 2, Issue 2: Critical Fat Phenomenologies 
Towards a Study the Efficiency of Transportation Work of Locomotives on a Mountain Section of the Railway Track
No full textДано обоснование величины количественных и денежных затрат потребляемой электрической энергии электровозами 3ВЛ80С при осуществлении ими железнодорожных перевозок грузов грузовыми поездами с разной массой составов на виртуальном (воображаемом) горном участке железной дороги. Здесь указанные затраты представляют собой параметры основных показателей энергоэффективности использования (перевозочной работы) исследуемых локомотивов в условиях эксплуатации. Числовые значения параметров указанных индикаторов были получены в виде табличных данных для двух вариантов движения грузовых поездов, отдельно и графических зависимостей, построенных по их средним значениям. Предложены уравнения регрессии для определения средних значений некоторых кинематических параметров движения грузовых поездов и параметров основных показателей энергоэффективности исследуемых электровозов 3ВЛ80С для различных условий движения грузовых поездов на виртуальном горном участке железнодорожного пути для различных составов массы грузовых поездов. Доказано, что динамика указанных энергетических показателей с учетом изменения массы по составу грузового поезда описывается полиномиальной аналитической зависимостью с достаточным аппроксимационным значением надежности, равным единице, что соответствует стопроцентной точности их расчета. Для достижения поставленной цели исследований и реализации графического построения траекторий движения поезда автор использует расчеты тяги, опираясь на разработанный им численный метод решения дифференциального уравнения движения поезда и соответствующий алгоритм его реализации, где удельные результирующие силы поезда в начальных интервалах интегрирования принимаются линейными, а конечные значения траектории и скорости на шаге интегрирования равны найдена для средней скорости в текущем интервале с учетом дополнительных построений. Рекомендуется продолжить данные исследования с учетом более широкой номенклатуры серий электровозов и типов участков железных дорог в зависимости от сложности профиля пути, а также грузовых поездов с увеличенным весом составо
(Dis)Connections: An Exploration of the Roles of Food in the Lives of Dietetic Students and Dietitians in Canada
No full textFood is strongly symbolic and can hold either divergent or similar meanings to people from different backgrounds. The purpose of this research was to understand the roles food plays in the personal and professional lives of dietetics students and registered dietitians across Canada. This exploratory qualitative study included dietetic students (n=10) in Atlantic Canada and the Dietitians of Canada Student Network, and dietitians (n=15) from across Canada. The meaning of food was examined through the Photovoice technique with individual in-depth interviews to examine food perspectives and understandings. Transcripts were analyzed, ensuring data trustworthiness, through dependability, confirmability, and transferability of data and methods. Findings showed that shared food experiences might produce and reinforce emotional and social bonds among individuals. Sharing foods often helped to build social groups or communities. This study also identified the depth of contested relationships with food and negative language used to describe food, self, and food choice behaviours while underscoring the pressures to conform to a perceived external ideal. The results of this research highlighted the different roles and meanings that food plays for dietetics students and dietitians. These findings may initiate further self-reflection and empathy regarding food choice behaviours of self and others. Results might also clarify the impacts of personal epistemologies and ontologies on practice, which has the potential to strengthen the dietetics profession.
Performance Analysis of the Dual-Mesh Method for Coupled Conduction-Radiation Heat Transfer Computations
No full textComplex heat transfer simulations involving thermal radiation have a very high computational cost; therefore, a number of methods were developed to speed up this process, including the dual-mesh method proposed in this paper. This study aims to analyze its performance for a set of cases of different conduction-radiation parameter, optical thickness and albedo. The results are compared with standard solutions on meshes of two different densities in terms of computational time and quality of results. In most cases, the dual-mesh method gave better results than the coarse mesh simulations in terms of accuracy and, in all cases, reduced the computational time by at least 50% compared to the fine mesh simulations
Quantifying Supply Chain Resilience: A Markov Chain Approach
No full textIn modern conditions, the effectiveness of supply chains depends largely on their fault tolerance. This is a complex characteristic that refers to the ability of chain participants to maintain operational efficiency or restore the performance of technological processes under the negative impact of external factors. It is crucial for supply chain participants to be adequately prepared to respond to these factors to avoid significant losses for businesses, markets, and national economies as a whole. The aim of our research is to establish a methodology for qualitatively assessing the resilience of supply chains. This methodology will allow us to obtain precise resilience values, supporting decision-making in response to deviations and failures within supply chains. The research examines contemporary methods for identifying the causes of supply chain failures, studies the dynamics of process states in individual links of supply chains, develops a methodology for assessing their fault tolerance based on the theory of Markov processes, and provides recommendations for improving the fault tolerance of supply chains. The methodology was used to evaluate the fault tolerance of consumer goods supplies from manufacturers to the retail network. The supply chain parameters were adjusted based on the obtained values of fault tolerance, resulting in increased sales for the trading company
Enhancing Supply Chain Resilience: Theoretical And Practical Approaches
No full textThe article presents theoretical and practical approaches to assessing supply chain resilience, which have proven effective in addressing modern global challenges, including natural disasters, geopolitical conflicts, and pandemics. Particular attention is given to the development of a methodology based on Markov process theory, which enables the identification of "bottlenecks" in logistics operations and the analysis of their impact on the overall performance of the supply chain. This methodology provides the ability to predict the consequences of disruptions, develop response scenarios, and make proactive management decisions aimed at minimizing negative impacts and preventing further failures.The application of the proposed tools contributes not only to enhancing supply chain resilience through timely adaptation to changing conditions but also to optimizing logistics costs, improving interaction among supply chain participants, and raising the level of customer service. This makes the developed approaches an indispensable resource for companies operating in international logistics, striving to maintain their competitive advantages in an environment of instability
Energetic and Exergetic Analysis of the Cryogenic Air Liquefaction Plant Based on the Simple Linde-Hampson Cycle
No full textThe study analyzes the operation of the Linde-Hampson type cryogenic air liquefaction plant with one throttling. To identify the causes of system inefficiency, the exergetic analysis method is used, which succeeds in locating and quantifying the destructive effects of functional processes. The results of the exergy analysis show that the highest exergy consumptions are associated with the throttling process (41.15% of the mechanical power consumption) and the heat transfer at a finite temperature difference in the recuperative heat exchanger (14%). The directions to be followed in the strategy to improve the performance of the installation are thus identified either through functional changes of the specified scheme or through structural changes. Graphs are presented that show the sensitivity of the performance characteristics of the system (y [kg liquid/kg compressed air], w [MJ/kg liquid air] and COP) to the change of the decision parameters, and changes are proposed in the structure of the plant scheme in order to optimize its operation
Axial Solidification Experiments to Mimic Net-Shaped Castings of Aluminum Alloys
No full textNet-shaped casting processes in the automotive Industry have proved difficult to simulate due to the complexities of the interactions amongst thermal, fluid, and solute transport regimes in the solidifying domain. The existing casting simulation software lacks the necessary correlations of the fraction of solid as a function of cooling rate and other process parameters. To address the shortcomings, an axial directional solidification experiment setup was developed to map the thermal data as the melt solidifies unidirectionally from the chill surface under unsteady-state conditions. Pure Al was used to demonstrate the validity of the experiments in our ability to determine transient thermal diffusivity of the solidifying metal using an inverse heat transfer algorithm (IHTA). The thermal diffusivity (α) results evaluated by Laser Flash Analysis experiments, IHTA are both in good agreement with the published data on the same. The uniqueness of the α estimate using these experiments and IHTA is in its transient nature. The results demonstrate the reliability of the axial solidification experiment apparatus in accurately providing input to the casting simulation interface and aid in reproducing casting numerical simulation models efficiently
On Replicating the Thermal Conditions in High Pressure Die Casting Processes
No full textAcquiring thermal data during the High-pressure die casting (HPDC) process is very challenging. The effect of the various casting process parameters is usually assessed by examining the quality of the final cast after the casting process is completed. The existing casting simulation software lacks the necessary correlations of the interfacial heat transfer coefficient (IHTC) as a function of process parameters. To address this challenge, a hot chamber die casting (HCDC) experimental apparatus has been developed to replicate thermal conditions in industrial HPDC operations. The developed setup enables direct thermal measurements within the die cavity. The metal temperature has been estimated using the lumped mass approach, and the IHTC has been determined using an inverse heat transfer algorithm. The IHTC results obtained experimentally are in good agreement with the IHTC estimated during a set of industrial HPDC trials. The maximum deviation is about 14.1%. These results demonstrate the capability of the developed HCDC experimental apparatus in accurately replicating the industrial HPDC conditions and providing valuable experimental data that can be used in casting numerical simulation models
Dietitians’ Participation in Anti-Racist Actions: A Pilot and Feasibility Study of the Role of White Fragility
No full textThe year 2020 marked a “call to action” for racial equity/social justice. In addition to increased engagement in antiracist action by individuals racialized as Black, folks racialized as white increased their engagement though at rates neither equal to nor sustained as that of Black-identified individuals. “White Fragility,” the emotional responses of white-identifying individuals when asked to consider their role in racism, has been postulated as a reason why white-identifying individuals do not engage in antiracist actions. Similarly, the psychological constructs of emotional regulation and distress tolerance may explain white-identifying individuals’ reluctance to engage in antiracist actions as those constructs describe an individual’s ability to regulate/tolerate “negative” emotions. Using a cross-sectional survey, we conducted a pilot and feasibility study to evaluate white fragility, distress tolerance and emotional regulation as possible influences on white, non-Hispanic-identifying healthcare professionals’ lack of engagement in antiracist actions. We analyzed the responses of n=82 white, non-Hispanic credentialled dietetics professionals. Correlation analyses demonstrated a highly significant negative association between white fragility and engagement in antiracist actions (-0.55, p<0.001). Multiple linear regression analyses revealed white fragility as a highly statistically significant negative predictor of engagement in antiracist actions when relevant demographic factors are controlled for (β-0.43; CI: -3.52, -1.15; R2=.34). Emotional regulation and distress tolerance were not significant predictors of engagement in antiracist actions. Feasibility analyses showed inadequate response and completion rates to allow for adequate power for analyses. Larger studies to explore these relationships are warranted, and strategies to improve recruitment, response, and completion rates are essential