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    Wyświetlanie 1-4 z 4
    Tytuł:
    Optimization of geometric and flow parameters of solar air heater roughened with artificial roughness by Taguchi method
    Autorzy:
    Sahu, Mukesh Kumar
    Mishra, Shivam
    Kumar, Avinash
    Powiązania:
    https://bibliotekanauki.pl/articles/27312207.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    roughness
    nusselt number
    friction factor
    Taguchi method
    optimization
    Opis:
    The paper presents the investigation of the optimum design parameters of a solar air heater (SAH) having wire ribs as artificial roughness by using the Taguchi method. The solar air heater has arc shape roughness geometry with apex upstream flow on the absorber plate. The objective of this paper is to obtain a set of parameters that deliver maximum thermo-hydraulic performance. For this objective, a new parameter the thermo-hydraulic improvement parameter (ηTHIP), has been introduced. For the present analysis, the effects of Reynolds number (Re), relative roughness pitch (P/e), angle of attack (α), and relative roughness height (e/Dh), denoted by A, B, C, and D, respectively, have been considered. An (L18 = 61 · 3 2 ) orthogonal array (OA) was chosen as an experimental plan for applying the Taguchi method. The set of control factors for the solar air heater SAH which delivers the maximum Nusselt number (Nu), and minimum friction factor (fr) – are A6B2C2, and A1B1C3 respectively. To obtain the maximum THIP the experimental set-up requires only one single run using the parameter A6B2C2, hence there is no need to run it all 54 times.
    Źródło:
    Archives of Thermodynamics; 2023, 44, 3; 3--33
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bearing Capacity Evaluation of Shallow Foundations on Stabilized Layered Soil using ABAQUS
    Autorzy:
    Bhardwaj, Avinash
    Sharma, Ravi Kumar
    Powiązania:
    https://bibliotekanauki.pl/articles/2202785.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    sand
    clay
    bearing capacity
    industrial waste
    ABAQUS
    Opis:
    In this paper, the finite element method (FEM) is applied to calculate the bearing capacity of two footings having the aspect ratio L/B (where L and B are the length and width of the footing, respectively) equal to 1, 2 resting on one-layer and two-layer soil. Soil profile contains two soil types including sand and clay. The soil strip is 500mm × 500mm × 350mm; however, only a quarter of the model (250mm × 250mm × 350mm) is examined in the study. Two primary situations are investigated in this study. In the first situation, the one-layer system is supposed to be sandy soil with footing overlays on medium-dense sand. The soft clay/stabilized clayey layer is supposed to be on top of the sandy soil in the second condition, with the footing resting on top of the soft clay/stabilized clay. The influence of layer thickness, aspect ratio, and material property on the bearing capacity value and footing failure mechanism is studied for eight different combinations of layered soil. The bearing capacity for a one-layer case is also estimated, and it agrees well with Vesic (1973), Hansen (1970), and Terzaghi's (1943) equations. The bearing capacity of footings is observed to decline when the height of unstabilized clayey soil increases, and it increases when clayey soil is stabilized with molasses, waste foundry sand, and lime alone and in combination with each other.
    Źródło:
    Studia Geotechnica et Mechanica; 2023, 45, 1; 55--71
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pulmonary Function Improves in Persons with Paraplegia after Partial Body Weight Supported Treadmill Training: a Prospective Randomized Study
    Autorzy:
    Ghosh, Srutarshi
    Gupta, Anil Kumar
    Kumar, Dileep
    Mishra, Sudhir
    Yadav, Ganesh
    Agarwal, Avinash
    Powiązania:
    https://bibliotekanauki.pl/articles/2192853.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
    Tematy:
    Partial Body Weight Supported Treadmill Training
    PBWSTT
    paraplegia
    improvement
    ventilation
    PFT
    Opis:
    Objectives: To evaluate changes in Pulmonary Function Test (PFT) parameters in individuals with paraplegia following Partial Body Weight Supported Treadmill Training (PBWSTT). Design: Randomized controlled trial Setting: Inpatient rehabilitation facility Participants: Adults with chronic SCI (n = 42). Intervention: Patients were randomly allocated in CR group (N= 20) receiving Conventional Rehabilitation or in PBWSTT group (N=22) receiving both Conventional Rehabilitation and PBWSTT for 4 weeks. Main outcome measure(s): Changes in % predicted PFT parameter for the subject’s age, sex and BMI. Results: With PBWSTT, significant PFT changes were VC (P =.009), PEF (p = .001) and ERV (p = .032). In complete SCI, PEF (p = .026) improved, while in incomplete SCI VC (p = .005), ERV (p = .029), PEF( p = .001) improved with PBWSTT. In upper neurological level of injury (NLI) (T6-T11), PBWSTT improved PEF (p = .004) alone while in lower NLI (T12-L2), with PBWSTT both ERV (p = .016) and PEF (p = .035) improved. Conclusions: With added PBWSTT most parameters including Vital Capacity, the global measure of PFT, improved significantly, especially in Lower NLI and incomplete SCI. The positive role of this noninvasive exercise based intervention in improving lung functions comes as an added benefit to the usual benefit of locomotion. This may encourage researchers to design future larger studies to validate it aiming the inclusion of PBWSTT in routine SCI rehabilitation protocols.
    Źródło:
    Central European Journal of Sport Sciences and Medicine; 2023, 41; 49-60
    2300-9705
    2353-2807
    Pojawia się w:
    Central European Journal of Sport Sciences and Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Occupational health and metabolic risk factors: A pilot intervention for transport workers
    Autorzy:
    Naug, Helen L.
    Colson, Natalie J.
    Kundur, Avinash
    Santha Kumar, Abishek
    Tucakovic, Lada
    Roberts, Michael
    Singh, Indu
    Powiązania:
    https://bibliotekanauki.pl/articles/2177422.pdf
    Data publikacji:
    2016-05-05
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    obesity
    transport workers
    lifestyle education
    education interventions
    sedentary behavior
    metabolic risk
    Opis:
    Objectives Heavy vehicle transport workers have a high risk of obesity and obesity-related disorders including cardiovascular disease and diabetes. Sedentary nature of their work makes a healthy work and lifestyle balance difficult to achieve. Educational interventions that promote behavioral changes have been shown to be effective in various group settings. The aims of this study were to determine the prevalence of metabolic risk factors among a population of urban bus drivers; to deliver a 3-month educational intervention specifically tailored for the workplace environment of transport workers; and to evaluate the efficacy of the intervention through quantitative measurements and qualitative feedback. Material and Methods Thirty-three bus drivers from depots in south Queensland were recruited for the study. Baseline metabolic data were collected through anthropometric measurements, blood collection and diet/lifestyle questionnaires. Metabolic risk factors that were analyzed included: waist circumference, blood pressure, fasting glucose, blood triglycerides and high density lipoprotein cholesterol (HDL-C). Three interactive seminars were delivered over a 3-month period. At the end of the period, data collection was repeated. Results At the commencement of the study, 35% of the participants exhibited ≥ 3 of the metabolic risk factors that characterize metabolic syndrome. This is higher than the reported prevalence in the general Australian population (22.1%). A total 21 of the 33 participants remained committed to the intervention and provided pre and post intervention data. Of these, 28% (N = 6) showed a decrease in one or more of the risk factors associated with metabolic syndrome. There was a significant increase in the average HDL-C after the intervention. Qualitative feedback indicated that the workers benefited from the program, especially regarding their awareness of the risks associated with their profession. Conclusions This pilot study demonstrates that lifestyle education seminars specifically tailored for the workplace can have an impact on the health behaviors of transport workers.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2016, 29, 4; 573-584
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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