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Effect of microtemperatures for micropolar thermoelastic bodies
Marin Marin,Dumitru Baleanu,Sorin Vlase 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.61 No.3
In this paper we investigate the theory of micropolar thermoelastic bodies whose micro-particles possess microtemperatures. We transform the mixed initial boundary value problem into a temporally evolutionary equation on a Hilbert space and after that we prove the existence and uniqueness of the solution. We also approach the study of the continuous dependence of solution upon initial data and loads.
Relaxed Saint-Venant principle for thermoelastic micropolar diffusion
Marin Marin,Ibrahim Abbas,Rajneesh Kumar 국제구조공학회 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.51 No.4
The main goal of this study is to extend the domain of influence result to cover the micropolar thermoelastic diffusion. So, we prove that for a finite time t>0 the displacement field ui, the microrotation vector φi, the temperature θ and the chemical potential P generate no disturbance outside a bounded domain Bt.
Native People in Population Censuses: United States (2020) and Canada (2021
Marines Liliana Cordero 한국캐나다학회 2023 Asia-Pacific Journal of Canadian Studies (APJCS) Vol.29 No.1
Since population censuses have been an instrument implemented by governments to know their population and to implement or design public policies, the objective of this text is to discern the differences and similarities in which the governments of Canada and the United States know the native peoples living in their territories. Through an interpretative methodology of content analysis, we analyze the institutional objectives and purposes, the periodicity of each demographic exercise, the margin for ethnic specificities to be expressed in the surveys, the ways of referring to these alterities and the alternative sources of statistical information used. It is concluded that, while the Canadian census advances in the recognition of First Nations, Inuit or Inuk and Métis, the U.S. census reduces the margin for the cultural diversity existing between American Indians and Alaska Natives to be expressed.
Dietary Habits in Patients with Systemic Lupus Erythematosus
Marin Petric,Josko Bozic,Mislav Radic,Dijana Perkovic,Marija Petric,Dusanka Martinovic Kaliterna 한국식품영양과학회 2020 Journal of medicinal food Vol.23 No.11
Patients with systemic lupus erythematosus (SLE) are often interested in which diets to follow. Our aim was to investigate which dietary habits were common among our patients, and which of them were in correlation with laboratory parameters of disease activity, such as complement values and 24-h proteinuria. This study included 76 patients with SLE in clinical remission with a 6-month flare free period. They completed a specialized, self-administered, 23-item food frequency questionnaire about their weekly dietary habits. Basic anthropometric data, levels of C3 and C4, and 24-h proteinuria were recorded and analyzed with respect to their dietary habits. The majority of patients had a normal body mass index of 18.5–25 kg/m2, and worked out regularly. The most frequently consumed foods reported by the patients were fruits, milk, vegetables, meat, pasta, rice, and bread. Decreased values of C3 were found in 34 (44.7%) patients, and decreased values of C4 in 28 (36.8%) patients. Decreased values of C3 were found in patients who often consumed meat (P = .015), and decreased values of C4 in patients who often consumed fast food (P = .043). Patients who often consumed fast food demonstrated a decreasing trend of C3 (P = .060), and patients who often consumed fried food had a decreasing trend of C4 (P = .051). Significant correlation between daily proteinuria and dietary habits was not found. Dietary habits can influence the disease course of SLE. Our study confirms that decreased levels of complement compounds C3 and C4, which are possible predictors of disease activation, are associated with frequent consumption of low quality proteins and food rich in calories.
Modelling levels of nitrous oxide exposure for healthcare professionals during EMONO usage
Marine Pichelin,Catherine Billoet,Georges Caillibotte 대한직업환경의학회 2016 대한직업환경의학회지 Vol.28 No.-
Background: Computational fluid dynamics (CFD) has been used to compute nitrous oxide (N₂O) levels within a room during the administration of an equimolar mix of N₂O/oxygen (EMONO) in the clinical setting. This study modelled realistic scenarios of EMONO usage in hospital or primary care, in order to estimate the potential N₂O exposure of healthcare professionals (HCP) with routine EMONO use and to provide guidance for EMONO users. Methods: Sixteen scenarios were defined by carrying out a survey of practitioners. CFD simulations were performed for each scenario and N₂O concentrations over time were calculated. N₂O exposures (time-weighted average of concentration over 8 h [TWA-8 h]) were calculated at the HCPs’ mouth to be compared with a predefined occupational exposure limit (OEL). Results: Administration duration and ventilation type were the main factors influencing N₂O levels; ventilation type also influenced wash-out time between EMONO administrations. N₂O concentration showed a plume distribution towards the ceiling and was highly heterogeneous, highlighting the importance of measurement location. Although estimated TWA-8 h varied widely, 13 of the 16 scenarios had an N₂O TWA-8 h of <100 parts per million. Conclusions: Data demonstrate that EMONO usage in well ventilated rooms – as recommended – helps to ensure that N₂O exposure does not exceed the OEL and does not signal any major risks for HCPs when recommendations are followed. Although these data are numerical simulations and should be considered as such, they can provide guidance for EMONO users.
Evolutionary multi-objective optimization of energy efficiency in electrical discharge machining
Marin Gostimirovic,Vladimir Pucovsky,Milenko Sekulic,Miroslav Radovanovic,Milos Madic 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.10
Electrical energy, which in the machining zone is transformed into heat, is of key importance in electrical discharge machining (EDM). Machining performance of EDM is determined by the characteristic of discharge energy. Therefore, an experimental-analytical approach of discharge energy efficiency was analyzed. The main input parameters for controlling the discharge energy are discharge current and discharge duration. The EDM process is monitored considering the two output machining performance, i.e., material removal rate and surface roughness, which are important for increasing productivity and quality. We modeled the energy efficiency of electrical discharge machining by the use of genetic algorithm. With this action an attempt was made to find even more precise dependence of discharge energy parameters with machining performance. Finally, this was followed by optimization of the discharge energy efficiency in EDM process using multi-objective approach. Evolutionary two-objective optimization is leading to the set of optimal solutions for the discharge energy considering the two machining parameters. Using this set of solutions, EDM discharge energy parameters can be selected to achieve high material removal rate with good surface roughness.