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    Wyświetlanie 1-4 z 4
    Tytuł:
    Studying on mineralogical and petrological characteristics of Gara Djebilet oolitic iron ore, Tindouf (Algeria)
    Autorzy:
    Chebel, Nassima
    Nettour, Djamel
    Chettibi, Mohamed
    Rachid, Chaib
    Khoshdast, Hamid
    Hassanzadeh, Ahmad
    Powiązania:
    https://bibliotekanauki.pl/articles/29551591.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    oolitic iron ore
    Gara Djebilet
    mineralogical characterization
    mineral processing
    Opis:
    Demand for iron ore worldwide has been steadily increasing which leads to the extraction of iron ore deposits with more complex mineralogies and higher levels of silicon and phosphorus impurities. This is the case in Algeria with the iron ore deposit of Gara Djebilet, Tindouf; where it has recently been exploited to ensure the sufficiency of iron ore required to produce iron and steel products. This deposit has remained unexploited for several decades due to inadequate knowledge of its mineralogy, treatment, and economic assessments. This study aims to find out the microstructure, chemical composition, and mineralogical distribution of valuable minerals and impurities, to understand the efficient processing methods for this specific iron ore. The characterization of representative ironstone samples taken from the studied area was carried out using optical microscopy, X-ray fluorescence spectrometer (XRF), petrographic microscope, X-ray diffractometer (XRD), and scanning electron microscope (SEM) coupled with energy dispersive X-ray spectroscopy (EDS). The results of the mineralogical analyses confirmed that it is an oolitic fine-grained ore consisting of gangue minerals principally composed of quartz, apatite, and iron-rich concentric cored structures. Chemical analyses of the ore indicated that it contains 56.58 wt% Fe with 7.98 wt% SiO2, 7.09 wt% Al2O3, and minor amounts of P2O5, CaO, MgO, and TiO2 compounds. The phosphorus associated was present in both ooids and groundmass, indicating that the ore has a complex texture with very rich and diverse mineralogy. For that, two conceptual scenarios were potentially proposed for processing the studied iron ore, while further detailed automated mineralogical information was required to make sure about the processing units from a practical perspective.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 5; art. no. 178382
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A sensitive approach to identify black spots in urban transport, with application to cities in Algeria
    Autorzy:
    Kelilba, Mounira
    Chaib, Rachid
    Kahlouche, Abdelaziz
    Powiązania:
    https://bibliotekanauki.pl/articles/2203850.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    priority actions
    continuous improvement
    Moscow prioritization
    urban transport
    działania priorytetowe
    ciągłe doskonalenie
    priorytetyzacja w Moskwie
    transport miejski
    Opis:
    Global population growth and rampant urbanization have led to the accelerated development of large cities, which are themselves rapidly affected by a sudden increase in transport demand, or even a disruption of the daily concerns of citizens and the economic growth of the country. Currently, management of urban transport is a major issue in terms of the quality of life for citizens and the economic, social and cultural competition between the different cities. In many parts of the country, cities are booming, which has caused a major disruption in traffic. In spite of investments and development on urban layout, planning and development of means of transport in many cities of the country are faced with problems of massive influx of users, traffic jams, congestion, traffic accidents, and air and noise pollution. However, it should be mentioned that the problems are not identical and each city has its own specificities. The proposed working methodology is based on the identification of the problems in the field reported in the various national media and newspapers, grouped into five groups mentioned in the working approach. These are the black spots recorded in some wilayas of the republic, especially the big cities (Algiers, Constantine, Setif ...). Knowledge of the magnitude of the factors present on the ground makes it possible to have an overview of the malfunctions, or even perform « mapping of the black spots» to better choose the best directions to take. Thus, this study aims to highlight some of the urban transport problems encountered in certain Algerian cities and to then suggest possible solutions, or even identify actions to be undertaken on a priority basis currently and in the future.
    Źródło:
    Transport Problems; 2021, 16, 1; 199--210
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Towards a better understanding of the reasons for the extensive use of private cars: a case study in Skikda, Algeria
    Autorzy:
    Djekrif, Fatma Zohra
    Bouyaya, Linda
    Chaib, Rachid
    Powiązania:
    https://bibliotekanauki.pl/articles/2203859.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    congestion
    private car
    mobility
    transport modes
    survey
    Skikda
    korek
    prywatny samochód
    mobilność
    środki transportu
    badanie
    Opis:
    With the continuous urban expansion of cities around the world, cities have become more crowded as the numbers of all kinds of vehicles have increased, especially due to the inclination of individuals to use personal cars. In this study, we want to identify the different reasons that motivate the populations of the state of Skikda, Algeria, to prefer using cars through a questionnaire. In order to be clearer, we processed and analyzed the survey data using the SPSS analytical program. This article aims to identify the main reasons that motivate individuals to prefer using a personal car when traveling and propose possible solutions, or even identify actions to be taken now and in the future in order to establish a more sustainable exclusive transport. By analyzing the results, it became clear to us that road users prefer cars only for psychological and technical reasons and do not consider the preservation of the environment or the security of people. Although they are aware of the problems arising from their extensive use, they continue to do so because they have no other alternative. Improvements in public transportation means would change the situation.
    Źródło:
    Transport Problems; 2022, 17, 4; 103--114
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Well-being at work: a lever for sustainable performance in workplace
    Autorzy:
    Amrani, Mourad
    Chaib, Rachid
    Bouzaouit, Azzedine
    Ion, Verzea
    Powiązania:
    https://bibliotekanauki.pl/articles/1402335.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
    Tematy:
    well-being
    economic performance
    health
    safety culture
    Opis:
    In a context of increasing pressure on performance, which affects almost all Algerian companies, question effectiveness of a policy of well-being at work depends on its impact on organizational performance: Numerous figures show costs of psychosocial risks, stress, absenteeism, etc. By virtue of the principle that a happy worker would also be a more productive worker, generating benefit for enterprise and a cost-reducing factor, even generating a better productive and commercial performance. Therefore, to reach these expectations, health culture and well-being at work must be part of basic values of actors of work world who are responsible for implementing an integrated preventive approach in all companies. As a result, an appeal is made to all managers and partners to make a joint commitment to effectively and efficiently reduce causes of work accidents and occupational diseases proliferation: company health, it’s health in the business. From now on, occupational health capital management and wellbeing of any company is one of its military priorities for its performance. It is part of company strategic objectives and must be taken into account in its daily operation.
    Źródło:
    Mining Science; 2020, 27; 89-104
    2300-9586
    2353-5423
    Pojawia się w:
    Mining Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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