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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.
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.
Using a Body Scanner in Assessing Perceptions of Attractiveness: Cross-Regional Study
( Marine Aghekyan ),( Dong Eun Kim ),( Margaret Lichty ) 한국의류학회 2013 한국의류학회지 Vol.37 No.6
Previous research reported that body size measured as Body Mass Index (BMI) and body shape measured as waist-hip-ratio (WHR) are two essential factors that form the perceptions of body attractiveness. However, the debate on the importance of BMI versus WHR is ongoing. In addition, scholarly articles, that focus on the role of geographic and cultural variability on perceptions of attractiveness, report inconsistent results. Some suggested that according to globalization and the rise of mass media, geographic variability of perceptions of attractiveness have been altered, while others believed that it remains. This study cross-regionally investigates the role of body size and body shape on the perceptions of female attractiveness. Samples were composed of 107 female college students in Alabama and 107 female college students in California. Participants viewed 27 three-dimensional body scan images of women in three body shapes (pear, hourglass, and rectangle) and three body sizes (underweight, normal weight, and overweight) and rated their perceptions of attractiveness. Images were shown to students in a random order with an overhead projector and Microsoft Office PowerPoint software. A three-way mixed-ANOVA was conducted to analyze the data. The results of the study showed that some regional differences exist between the two sample groups. However, regardless of the regional difference, hourglass shapes were perceived to be the most attractive shape and underweight sizes were perceived to be the most attractive size for both samples.
A New CAD Environment for Benchmarks of Analog Circuit Sizing Tools and Algorithms
Marin,David,Escudero,Juan,Oliver,Joan,Flandre,Denis 대한전자공학회 1997 ICVC : International Conference on VLSI and CAD Vol.5 No.1
This paper presents a new open environment for the design of analog circuits exchanging information from existing tools. The main features of these tools have been extended in CONNAN by means of a netlist analyzer, the interaction with a commercial CAD tool and a transistor model manager that solves some common problems of sizing tools based on electrical simulators. As an initial test CONNAN is applied to the sizing of analog IC based on electrical simulators and simulated annealing algorithms.
Accuracy of structural computation on simplified shape
Marin, P. Techno-Press 2010 Structural Engineering and Mechanics, An Int'l Jou Vol.35 No.2
This paper focuses on a number of criteria that enable controlling the influence of geometric simplification on the quality of finite element (FE) computations. To perform the mechanical simulation of a component, the corresponding geometric model typically needs to be simplified in accordance with hypotheses adopted regarding the component's mechanical behaviour. The method presented herein serves to compute an a posteriori indicator for the purpose of estimating the significance of each feature removal. This method can be used as part of an adaptive process of geometric simplification. If a shape detail removed during the shape simplification process proves to be influential on mechanical behaviour, the particular detail can then be reinserted into the simplified model, thus making it possible to readapt the initial simulation model. The fields of application for such a method are: static problems involving linear elastic behaviour, and linear thermal problems with stationary conduction.
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.