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    Wyświetlanie 1-13 z 13
    Tytuł:
    The new method for assessing rock abrasivity in terms of wear of conical picks
    Autorzy:
    Mucha, Kamil
    Powiązania:
    https://bibliotekanauki.pl/articles/2064422.pdf
    Data publikacji:
    2019
    Wydawca:
    STE GROUP
    Tematy:
    test method
    assessment of abrasivity
    conical picks
    abrasive wear
    underground mining
    metoda badań
    ocena ścieralności
    noże styczno-obrotowe
    zużycie ścierne
    górnictwo podziemne
    Opis:
    During the exploitation of mineral raw materials, a cutting tool is an element that is directly in contact with the unmined stone being cut. The most commonly used cutting tools include conical picks. The increasing pressure to reduce mining costs causes an increasing demand for affordable and reliable ways to increase the reliability of mining machines. Abrasive wear is the most common process affecting the wear of shearer picks, hence a good and simple laboratory method for assessing rocks abrasivity is needed. The new method was developed in the aspect of selection of conical picks with appropriate protection of the pick working part, increasing its durability. The method involves the assessment of mass abrasive wear of a standard steel pin and rock sample, and the determination of the abrasivity index Wz of the tested rock, as the ratio of the mass loss of the steel pin to the mass loss of the rock sample. The article presents the procedure of conducting tests, construction of a laboratory test stand and the use of the developed method to assess the abrasivity of gangue rocks occurring in the currently cut tunnel excavations of Polish hard coal mines.
    Źródło:
    New Trends in Production Engineering; 2019, 2, 1; 186--194
    2545-2843
    Pojawia się w:
    New Trends in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the Quality of Conical Picks and the Possibility of Predicting the Costs of Their Use
    Autorzy:
    Krauze, Krzysztof
    Mucha, Kamil
    Wydro, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2064880.pdf
    Data publikacji:
    2020
    Wydawca:
    STE GROUP
    Tematy:
    underground mining
    rocks cutting
    conical picks
    costs
    Opis:
    Currently, the user’s choice of a conical pick involves specifying its geometric and material parameters, taking into account the place and conditions of its work. The selection is then made, usually on the basis of solely one criterion, which is the price. Thus, at the stage of both purchase and operation, the quality of picks and their suitability for a specific machine and the processed mineral are not assessed. Therefore, a method was developed to enable conducting tests that determine the geometric parameters of a pick, the types of materials of the pick body and WC insert as well as the pick wear rate (intensity) in a laboratory workstation. The wear rate (intensity) is described by the C2 index – the smaller is its value, the slower is the pick’s wear. The C2 index has been used to forecast the wear of picks and to determine their unit price and operating costs. This allows for precise determination of investment requirements and a proper selection of the pick.
    Źródło:
    Multidisciplinary Aspects of Production Engineering; 2020, 3, 1; 491--504
    2545-2827
    Pojawia się w:
    Multidisciplinary Aspects of Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena jakości noży styczno-obrotowych oraz prognozowanie ich kosztów zużycia
    Assessment of the quality of conical picks and forecasting the costs of their use
    Autorzy:
    Krauze, Krzysztof
    Mucha, Kamil
    Wydro, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1861177.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Górnictwa
    Tematy:
    górnictwo
    skrawanie
    noże styczno-obrotowe
    koszty
    mining
    rocks cutting
    conical picks
    costs
    Opis:
    W chwili obecnej wybór, przez użytkownika, noża styczno-obrotowego polega na sprecyzowaniu jego parametrów geometrycznych i materiałowych, uwzględniających miejsce i warunki jego pracy. Następnie dokonuje się wyboru, zazwyczaj na podstawie tylko jednego kryterium, jakim jest cena. Tym samym na etapie zakupu, jak i eksploatacji, nie prowadzi się oceny jakości noży i ich przydatności do konkretnej maszyny i urabianego minerału. Dlatego powstała metoda pozwalająca przeprowadzić takie badania, w których dokonuje się pomiarów parametrów geometrycznych noża, ustala się rodzaje materiałów korpusu noża i wkładki WC oraz szybkość zużycia (intensywność) na stanowisku laboratoryjnym. Szybkość zużycia (intensywność) opisana jest za pomocą wskaźnika C2, którego wartość im jest mniejsza, tym nóż wolniej się zużywa. Wskaźnik C2 został wykorzystany do prognozowania zużycia noży i określenia ich ceny jednostkowej oraz kosztów eksploatacyjnych. Pozwala to na precyzyjne określenie wymagań inwestycyjnych i prawidłowy wybór noża.
    Currently, the user’s choice of a conical pick involves specifying its geometric and material parameters, taking into account the place and conditions of its work. The selection is then made, usually on the basis of solely one criterion, which is the price. Thus, at the stage of both purchase and operation, the quality of picks and their suitability for a specific machine and the processed mineral are not assessed. Therefore, a method was developed to enable conducting tests that determine the geometric parameters of a pick, the types of materials of the pick body and WC insert as well as the pick wear rate (intensity) in a laboratory workstation. The wear rate (intensity) is described by the C2 index - the smaller is its value, the slower is the pick’s wear. The C2 index has been used to forecast the wear of picks and to determine their unit price and operating costs. This allows for precise determination of investment requirements and a proper selection of the pick.
    Źródło:
    Przegląd Górniczy; 2020, 76, 9; 1-9
    0033-216X
    Pojawia się w:
    Przegląd Górniczy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Operational Tests of a Modular Installation and Transport Assembly of Steel Arch Support in Underground Excavations
    Autorzy:
    Krauze, Krzysztof
    Mucha, Kamil
    Wydro, Tomasz
    Kutnik, Andrzej
    Hałas, Waldemar
    Ruda, Piotr
    Osowski, Dawid
    Powiązania:
    https://bibliotekanauki.pl/articles/2064564.pdf
    Data publikacji:
    2021
    Wydawca:
    STE GROUP
    Tematy:
    underground mining
    steel arch support
    modular installation and transport assembly
    safety
    Opis:
    The roof support, especially the ŁP yielding steel arch support, is transported and assembled in the face with the use of auxiliary machines. This activity in Polish underground mines causes numerous problems, which until present have not been solved. Currently, transport and assembly are carried out manually, while the roadheader and suspended rail are used only to a small extent. Therefore, the modular installation and transport assembly was developed jointly by FAMA Sp. z o. o. and AGH University of Science and Technology. The solution in question enables performing a number of functions (including transport and assembly of all kinds of support arches), which are not available in currently manufactured equipment. The proposed manipulator solves numerous problems occurring during the installation of the steel arch support in an underground mining excavation and significantly improves the process of drilling galleries. This innovative solution considerably differs from the existing ones, and its greatest advantage is versatility with regard to the cross-section and equipment of the roadway, as well as a wide range of functions. In addition, it can also be used for reloading works. The modular installation and transport assembly together with a platform, a temporary mechanized roof support and a mining machine, make up a mechanizes roadheader complex, which enables continuous mining, loading and installing the permanent support in underground workings.
    Źródło:
    Multidisciplinary Aspects of Production Engineering; 2021, 4, 1; 343--354
    2545-2827
    Pojawia się w:
    Multidisciplinary Aspects of Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Why to employ foreign academics in Poland? Perspective of heads of university research teams
    Autorzy:
    Łuczaj, Kamil
    Mucha, Janusz
    Powiązania:
    https://bibliotekanauki.pl/articles/580035.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ACADEMIC MOBILITY
    HIGHLY SKILLED MIGRANTS
    CENTRAL AND EASTERN EUROPE
    IMMIGRATION TO POLAND
    Opis:
    Academic international mobility is a long-lasting phenomenon and important aim of public policies in numerous countries. Scholarly debate usually concentrates on Western countries and some Eastern Asian scientific hubs like Singapore. Central and Eastern Europe (CEE) is understudied. In Poland, the largest CEE country, unlike in many Western countries, public policies concerning internationalization of the academic field are still under construction. Nevertheless, there is a strong pressure for internationalization. The Polish case to be discussed in this article can serve as an example of academic migration to less economically privileged regions that are usually countries of emigration of scholars rather than immigration. In this paper, by means of qualitative in-depth interviews, we concentrate on the need to invite academics from abroad and the perceptions of the actual presence of foreign scholars, employed full-time, as seen by their Polish supervisors. Geographical focus of this paper (CEE) and adopted perspective (interviews with heads of departments supported by interviews with academics) bridge the gap in the literature on academic mobility.
    Źródło:
    Studia Migracyjne - Przegląd Polonijny; 2018, 44, 3 (169); 185-204
    2081-4488
    2544-4972
    Pojawia się w:
    Studia Migracyjne - Przegląd Polonijny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polska w świecie „krążących umysłów”. Ilościowa analiza struktury zatrudnienia zagranicznych uczonych
    Poland in the world of “circulating brains”. Quantitative analysis of the structure of employment of foreign scholars
    Autorzy:
    Mucha, Janusz
    Łuczaj, Kamil
    Powiązania:
    https://bibliotekanauki.pl/articles/577564.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    system akademicki w Polsce
    cudzoziemscy uczeni w Polsce
    migracje uczonych
    krążenie umysłów
    academic system in Poland
    foreign scholars in Poland
    migrations of scientists
    brain circulation
    Opis:
    Tekst ten ma charakter empiryczny i oparty jest wyłącznie na danych urzędowych. Pokazuje on, tylko od strony liczbowej, zbiorowość cudzoziemców, zatrudnionych w polskim systemie akademickim. We wprowadzeniu przedstawiono zarys społecznego kontekstu interesującej nas tutaj lokalnej, polskiej sytuacji. Ten kontekst to współczesne migracje wysokokwalifikowanych kadr, a w szczególności globalizacja świata nauki. W artykule zaprezentowano charakterystykę badanego zbioru danych; kraje, z których pochodzą zatrudnieni w polskim systemie akademickim uczeni; uczelnie, na których są oni najczęściej zatrudniani w Polsce; dyscypliny naukowe, które reprezentują; zależności między narodowością cudzoziemców a miejscem ich zatrudnienia w polskim systemie akademickim; związki między liczbą zatrudnianych cudzoziemców a miejscem danej uczelni w głównych rankingach polskich szkół wyższych i w końcu konkluzje dotyczące tego, czego można i czego nie można dowiedzieć się z analizowanego tutaj zbioru danych.
    This is an empirical quantitative analysis of the official data coming from the Polish Ministry of Science and Higher Education. The foreign scholars in contemporary Poland are presented in the context of global “brain circulation” or migration of highly qualified specialist. In this paper we discuss characteristics of the analyzed data base: universities and colleges where they are usually employed; academic disciplines they represent; relations between the number of foreign scholars and the prestige of institutions employing them. We conclude by pointing towards what we can and cannot learn from the data set analyzed here.
    Źródło:
    Zagadnienia Naukoznawstwa; 2013, 49, 1(195); 25-43
    0044-1619
    Pojawia się w:
    Zagadnienia Naukoznawstwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Foreigners in the Polish Academic System at the Beginning of the 21st Century. A Quantitative Analysis of their Employment According to the Official Documents1
    Autorzy:
    Mucha, Janusz
    Łuczaj, Kamil
    Powiązania:
    https://bibliotekanauki.pl/articles/1930111.pdf
    Data publikacji:
    2014-03-30
    Wydawca:
    Polskie Towarzystwo Socjologiczne
    Tematy:
    brain circulation
    migrations of scholars
    academic system in Poland
    foreign scholars in Poland
    Opis:
    This is an empirical quantitative analysis of the official data coming from the Polish Ministry of Science and Higher Education. The foreign scholars in Poland at the beginning of the 21st century are presented in the context of the global “brain circulation” or migration of highly qualified specialists. The second context is the present Polish academic system. In this paper we discuss characteristics of the analysed data base, universities and colleges where the foreign scholars are usually employed, the academic disciplines they represent, the relations between the number of foreign scholars and the institutional prestige of schools employing them, and conclusions on what we can and cannot learn from the data set analysed here.
    Źródło:
    Polish Sociological Review; 2014, 185, 1; 113-130
    1231-1413
    2657-4276
    Pojawia się w:
    Polish Sociological Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The lives of foreign academics in Poland: their motivations and adaptation in Kraków, a “Polish Silicon Valley”
    Autorzy:
    Mucha, Janusz
    Łuczaj, Kamil
    Powiązania:
    https://bibliotekanauki.pl/articles/702974.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    highly skilled migration
    Polish academic centers
    foreign researchers
    life in a foreign country
    Opis:
    The aim of this article is to analyze both the motivations of foreign scholars to come to work in Poland – specifically Kraków – and their ways of adapting to this significant Polish academic center. Most studies on highly skilled migrants (HSMs) concentrate on the flows between developing and highly developed countries. We concentrate on Central and Eastern Europe. This paper, based on in-depth interviews with 23 foreign scholars working full-time at four universities in Kraków, is a follow-up to a study presenting a 2015 analysis of websites of universities from Kraków. We look closely at barriers to and facilitators of foreign scholars’ adaptation to Poland and their perceived image of Poland and Polishness, their national identification and international contacts. We propose a typology comprised of “cosmopolitans”, “status seekers”, “enthusiasts”, and “commuters”. Our investigations reveal who decides to move to a semi-peripheral country such as Poland, and why. Certain parts of the narratives can be used in building a strategy of attracting more international scholars to academic centers such as Kraków.
    Źródło:
    Nauka; 2017, 2
    1231-8515
    Pojawia się w:
    Nauka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    METHODOLOGICAL ASPECTS OF RECENT EMPIRICAL RESEARCH ON ACADEMIC MIGRATION
    Autorzy:
    Mucha, Janusz
    Łuczaj, Kamil
    Powiązania:
    https://bibliotekanauki.pl/articles/579950.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    FOREIGN SCHOLARS IN POLAND
    MIGRATION OF SCIENTISTS
    BRAIN CIRCULATION
    METHODOLOGY
    Opis:
    The aim of this paper is to discuss the most important methodological issues related to the study of ‘academic migration’, which we have encountered while preparing a research project on foreign-born academics in Poland. These issues are presented in the context of the migration of other highly skilled workers. Many of the analysed articles which concern migration of the highly skilled fall into methodological traps. Some do not take into account important cultural variables; others are concentrated on very specific problems, and – by employing sophisticated statistical techniques – provide conclusions of very limited generality. We start our analysis with the discussion of the most common research problems. Then we move on to discussing sources of data and methodologies. The last part summarizes the main advantages and disadvantages of various methodological approaches often employed in academic migration studies. This study allows us to outline our above-mentioned research proposal. Drawing on this example we show how a qualitative research project may add to current knowledge concerning the group in question. Nevertheless, this subject is diffi cult per se, and some challenges seem impossible to overcome.
    Źródło:
    Studia Migracyjne - Przegląd Polonijny; 2014, 40, 4(154); 5-24
    2081-4488
    2544-4972
    Pojawia się w:
    Studia Migracyjne - Przegląd Polonijny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Developing the Academic Careers of Foreign Scholars in Poland: The Case of Krakow
    Autorzy:
    Mucha, Janusz
    Łuczaj, Kamil
    Powiązania:
    https://bibliotekanauki.pl/articles/498719.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Polish academic centres
    foreign researchers
    mobile academics
    cross-border higher education
    self-initiated expatriates
    Opis:
    This article discusses the professional careers of foreign scholars in Krakow, one of the leading academic centres in Poland and a regional ‘silicon valley’ (toutes proportions gardées). Central and Eastern Europe is understudied as an immigration region for highly skilled migrants (HSMs). To bridge this gap, we concentrate on three interrelated topics: (a) the perception of Polish science and its infrastructure; (b) careers of international staff employed in Polish academia; and (c) their perception of their achievements in Poland. Foreign scholars come to Poland for various reasons. Two of the most important are the cultural proximity between Poland and their country of origin, and research interests focused directly in Poland. Our findings show that Poland attracts first and foremost scholars with average scientific achievements. We discuss major problems they encounter (e.g., shortage of funds, uncomfortable office space, restricted access to books and papers) and their expectations of life in a semi-periphery country. The paper is mainly based on in-depth interviews with 23 foreign scholars working full time at four universities in Krakow and, as a secondary source, on the analysis of websites of these universities.
    Źródło:
    Central and Eastern European Migration Review; 2017, 6, 2; 141-162
    2300-1682
    Pojawia się w:
    Central and Eastern European Migration Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of Carbon Nanotubes on the Mechanical and Electrical Properties of Silicone
    Autorzy:
    Sałaciński, Michał
    Dydek, Kamil
    Leski, Andrzej
    Kozera, Rafał
    Mucha, Mateusz
    Karczmarz, Wojciech
    Powiązania:
    https://bibliotekanauki.pl/articles/24201178.pdf
    Data publikacji:
    2022
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    nanotubes
    silicon
    mechanical properties
    electrical properties
    Opis:
    This paper presents the results of a structure study of a dispersion composite on a silicone matrix with a filler in the form of multi-walled carbon nanotubes (MWCNTs). The study aims to determine the effect of the filler on the composite mechanical properties and electrical conductivity. Materials that are electrically conductive and exhibit high mechanical properties can find applications in high-strain sensors. During the study, the characteristic properties of the susceptible materials, silicone alone and silicone with different filler contents (4%, 6%, and 8% by weight), were determined after curing. Microscopic observations were performed to assess the influence of carbon fillers on the material structure and to determine the level of homogeneity of the material. Examination of mechanical properties facilitated the determination of the Shor A hardness (ShA), stiffness, and Poisson’s ratio of the cured composites, depending on the nanotubes’ content. In parallel with the study of mechanical properties, the effect of loading, and the associated deformation of the samples, on the conductivity of the composite was investigated. Based on the results obtained, a discussion was carried out on the type of conductivity characteristic of silicone with different filler content as well as depending on the level of deformation of the samples.
    Źródło:
    Fatigue of Aircraft Structures; 2022, 14; 135--153
    2081-7738
    2300-7591
    Pojawia się w:
    Fatigue of Aircraft Structures
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of hydrocarbon contamination on the engineering geological properties of Neogene clays and Pleistocene glacial tills from Central Poland
    Autorzy:
    Dobak, Paweł
    Izdebska-Mucha, Dorota
    Stajszczak, Piotr
    Wójcik, Emilia
    Kiełbasiński, Kamil
    Gawriuczenkow, Ireneusz
    Szczepański, Tomasz
    Zawrzykraj, Piotr
    Bąkowska, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/24024696.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    petroleum products
    contamination
    clay soils
    permeability
    shear strength
    swelling
    particle size distribution
    produkty naftowe
    zanieczyszczenia
    grunty spoiste
    przepuszczalność
    wytrzymałość na ścinanie
    pęcznienie
    rozkład wielkości cząstek
    PSD
    Opis:
    Petroleum products influence the engineering behaviour of the soil. Neogene clays and glacial tills from Central Poland were tested under laboratory conditions to evaluate the changes of selected physical and mechanical parameters: particle size distribution, particle density, swelling, shear strength and permeability. Four petroleum products were used in the experiments: diesel fuel, kerosene, jet fuel and mineral engine oil. The study revealed that even for the lowest degree of contamination the values of physical and mechanical properties of the soils changed significantly. Greater variation can be expected in soils contaminated with high-viscosity compounds. Also, higher relative changes were found for glacial tills than for Neogene clays. Consolidation tests revealed changes in soil permeability depending on the soil composition and the physical properties of the contaminant – considerable reduction of permeability was observed for glacial tills contaminated with light Jet fuel, while the reduction was lower for Neogene clays. The obtained results indicate the role of mesopores and the dimensionless pore pressure coefficient in changes of soil permeability. The methodological issues regarding testing and analysing the hydrocarbon-contaminated soils were also presented and discussed, which might be useful for researchers studying contaminated soils.
    Źródło:
    Acta Geologica Polonica; 2022, 72, 4; 529--555
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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