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    Wyświetlanie 1-3 z 3
    Tytuł:
    A proper borehole pattern design for coal seam methane drainage in Tabas coal mine using Comsol Multiphysics
    Autorzy:
    Bagherzadeh, Ali
    Najafi, Mehd
    Marji, Mohammad Fatehi
    Noroozi, Mehdi
    Powiązania:
    https://bibliotekanauki.pl/articles/2201375.pdf
    Data publikacji:
    2022
    Wydawca:
    Główny Instytut Górnictwa
    Tematy:
    numerical modeling
    borehole patterns
    COMSOL Multiphysics
    CFD simulation
    coal gas drainage
    modelowanie numeryczne
    schematy otworów wiertniczych
    symulacja CFD
    odmetanowanie
    Opis:
    Optimizing the operational parameters of the borehole pattern in the coal seam includes the maximum amount of gas to be drained with the least amount of drilling, investment, and drainage time. The main purpose of this research is to properly design the drainage borehole pattern in the C1 coal seam of the Tabas coal mine. In this research, the Comsol Multiphysics software was used for numerical modeling of the boreholes. According to the method of diffusion of methane gas in a coal seam, the reduction of methane gas concentration and the amount of gas released from the coal blocks were approximated. For the gas drainage boreholes, the three patterns of the rectangular, parallelogram, and triangular forms were considered. Also, the boreholes were modeled with the three diameters of 76, 86, and 96 mm. This modeling was performed for 180 days of drainage operation and showed that the triangular pattern was more suitable than the other two patterns. The presented model is applicable in coal mines where gas drainage operations are necessary and helps engineers design the patterns of drainage boreholes to maximize their gas drainage efficiency.
    Źródło:
    Journal of Sustainable Mining; 2022, 21, 1; 54--64
    2300-1364
    2300-3960
    Pojawia się w:
    Journal of Sustainable Mining
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    How is the Quality of Life of Students?: The Role of Depression, Anxiety and Stress
    Autorzy:
    Armoon, Bahram
    Mokhayeri, Yaser
    Haroni, Javad
    Karimy, Mahmood
    Noroozi, Mehdi
    Powiązania:
    https://bibliotekanauki.pl/articles/2121559.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    quality of life
    students
    depression
    anxiety
    stress
    Opis:
    Objectives: The aim of study was to investigate the association between anxiety, depression, stress and determinants of quality of life among Iranian students. Methods: The questionnaires were completed by 275 students. The random sampling was conducted in two phases, the stratified sampling which some classes were selected among different classes of faculty of health and at the second phase, in each class the number of students who had the requirements to enter in the study were selected randomly. the logistic regression to find out the association between demographic characteristics with the quality of life was run and according to the normality status of the distribution of data the parametric or non-parametric tests were used. Results: In the univariable model, the students that were living in their own homes had the odds of 2.18 times more than the others to have a higher quality of life level (95% CI: 1.07–4.45). In the multi variable model the anxiety and stress were significantly related to the quality of life and for increasing each 1 unit in the amount of anxiety and stress the odds of a better quality of life decreases 0.19 and 0.03 respectively. Even after adjusting for other covariates – in the multivariable model – both anxiety and stress were associated with the quality of life. Conclusion: It is useful for the universities to understand different aspects of the students’ lives which are under the influence of stress, anxiety and depression, and also determining the resources from which they are originated.
    Źródło:
    Polish Psychological Bulletin; 2019, 50, 1; 43-48
    0079-2993
    Pojawia się w:
    Polish Psychological Bulletin
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Patterns of Relapse Risks and Related Factors among Patients with Schizophrenia in Razi Hospital, Iran: A Latent Class Analysis
    Autorzy:
    Noroozi, Mehdi
    Alibeigi, Neda
    Armoon, Bahram
    Rezaei, Omid
    Sayadnasiri, Mohammad
    Nejati, Somayeh
    Fadaei, Farbod
    Ghahestany, Davood Arab
    Dieji, Bahman
    Ahounbar, Elahe
    Powiązania:
    https://bibliotekanauki.pl/articles/2127857.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Razi Hospital
    Iran
    Relapse Risks
    Patients
    Schizophrenia
    Latent Class Analysis
    Opis:
    Objectives: Relapse is very much associated with the management of disorder during the treatment, but also many other factors could trigger it. The aim of this study was to explore classes and patterns of relapse risk in patients with schizophrenia of Razi Hospital. Methods: Using random sampling techniques, we recruited 300 participants with a diagnosis of schizophrenia in Razi hospital of Tehran (Iran) between January and May 2017 in a cross-sectional survey. We used latent class analysis (LCA) to establish a baseline model of risk profiles and to identify the optimal number of latent classes, and we used ordinal regression to identify factors associated with class membership. Results: Three classes of multiple relapse risk were identified. LCA showed that, overall, 52%, 22% and 26% of participants with schizophrenia were divided into class 1, class 2 and class 3, respectively. Compared to members in the lowest-risk class (reference group), the highest-risk class members had higher odds of being the age of disorder onset under 25 (OR = 1.4; CI: 1.42–2.33). Participants with schizophrenia who were unemployed were more likely to categorize in the highest-risk class than members of the low-risk class (OR = 2.5; CI: 1.44–4.1). Also, female patients were more likely to belong to members of the high-risk class than members of the low-risk class (OR = 2.22; CI: 1.74–7.64). Conclusion: These findings emphasize the importance of having targeted prevention programs for all domains of Age of onset, female and unemployed related. So, current study suggested that interventions should focus on these risk factors. Furthermore, Increasing the Job opportunities for participants with schizophrenia is warranted so as to prevent of schizophrenia disorder.
    Źródło:
    Polish Psychological Bulletin; 2018, 49, 3; 355-359
    0079-2993
    Pojawia się w:
    Polish Psychological Bulletin
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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