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    Wyświetlanie 1-11 z 11
    Tytuł:
    Historia (subiektywna) transformacji (recenzja: Wielka transformacja. Zmiany ustroju w Polsce po 1989. Red. Ireneusz Krzemiński. Warszawa: Wydawnictwo Naukowe Łośgraf 2011, 623 s.)
    Autorzy:
    Myśliwiec, Maciej
    Powiązania:
    https://bibliotekanauki.pl/articles/427519.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Źródło:
    Studia Socjologiczne; 2012, 3(206); 175-180
    0039-3371
    Pojawia się w:
    Studia Socjologiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Archaeology meeting geophysics on Polish excavations in Egypt
    Autorzy:
    Myśliwiec, Karol
    Powiązania:
    https://bibliotekanauki.pl/articles/2026988.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Tell Atrib
    Saqqara
    Old King dom
    Ptol e maic Pe riod
    Opis:
    The ar ti cle pres ents the re sults of ar chae o log i cal ex ca va tions in two lo ca tions where geo phys i cal sur veys were car ried out for the first time on Pol ish ex ca va tions in Egypt: Tell Atrib (an cient Athribis in Lower Egypt) and Saqqara (west of the pyr a mid of Djoser). It em pha sizes the in ter de pen dence of ar chae o log i cal and geo phys i cal re search. Par tic u larly in - ter est ing were the re sults of three geo phys i cal sur veys made in Saqqara in 1987, 1997 and 2012 by three dif fer ent teams us ing dif fer ent meth ods. All of them helped iden ti fy ing ar chae o log i cal struc tures in two sub se quent lay ers corre spond ing to two pe ri ods: a) Old King dom (lower stra tum) with rock-hewn tombs of high of fi cials; b) Ptol e maic Pe - riod with hun dreds of buri als found in a layer of sand (up per stra tum).
    Źródło:
    Studia Quaternaria; 2013, 30; 45-59
    1641-5558
    2300-0384
    Pojawia się w:
    Studia Quaternaria
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The first fall of the Pharaonic state
    Autorzy:
    Myśliwiec, Karol
    Powiązania:
    https://bibliotekanauki.pl/articles/703634.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Pharaonic state
    disintegration of the Egyptian state
    Old Kingdom
    pyramid
    mastaba
    dynasties of noblemen
    Polish atcheologists in Saqqara
    tombs of Merefnebef and Nyankh-Nefertem
    Meresis-sons of Ny-ankh-Nefertem, graphic jokes of Egyptian sculptors
    h
    Opis:
    Pharaonic Egypt blossomed during three periods called Old-, Middle- and New Kingdom. The first of these (ca. 2650-2150 B.C.) was the time when the greatest pyramids, tombs of subsequent pharaohs, were built. This was possible thanks to a perfect organization of the country’s hierarchic administration. With time, systematically growing dynasties of noblemen became so powerful that they could compete with subsequent Kings. This led to political and social conflicts that became particularly dramatic in the times of Old Kingdom’s last (5th and 6th) dynasties. Many symptoms of progressing disintegration of the Egyptian state have been recorded in the tombs of 6th Dynasty noblemen discovered recently by Polish archaeologists in Saqqara, west of the pyramid of Djoser. The article summarizes these discoveries with respect to the country’s political, social and moral decline, which finished with the first collapse of cental power.
    Źródło:
    Nauka; 2009, 4
    1231-8515
    Pojawia się w:
    Nauka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Analysis of FSW Process Forces
    Autorzy:
    Balawender, Tadeusz
    Myśliwiec, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/176207.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    friction stir welding
    aluminum alloy 2024
    magnesium alloy AZ31
    force measurement
    welding force
    Opis:
    This paper presents the results of research work on linear friction stir welding (FSW) of magnesium AZ31 and aluminum 2024 alloys. During the FSW process, forces exerted by a tool on joined materials were measured. The measurements of forces were taken in three directions, vertical (Z axis) and horizontal (X and Y axes) directions, using high-sensitive piezoelectric dynamometer. The force analysis was done for three stages of welding process: plunging, dwelling, and welding. Conclusions regarding the force reaction of materials to be welded were formulated. It was found that the first two stages of the process, plunging and dwelling, are very important for the correct welding. In the plunging stage, a tool exerts the greatest forces and unit pressures (at the Z direction) on joined materials; during the dwelling stage, thermal conditions of the process are established. The welding stage was divided into two substages: the initial unstable and the subsequent long-term stabilized one.
    Źródło:
    Advances in Manufacturing Science and Technology; 2020, 44, 2; 51-56
    0137-4478
    Pojawia się w:
    Advances in Manufacturing Science and Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Friction Stir Welding of thin Sheets of Magnesium Alloy AZ31B
    Autorzy:
    Myśliwiec, P.
    Śliwa, R. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/352295.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    FSW welding
    magnesium alloys AZ31B
    thin sheet
    joining of metal sheets
    Opis:
    Friction stir welding developed in early 90’s is a refreshing approach to the joining of different kinds of metals. FSW has become increasingly popular and provides excellent alternative to conventional welding or riveting sheets of various metals. The paper present the results of research work on linear FSW joining magnesium alloys AZ31B of 0.5 mm in thickness. The study was conducted on properly adapted numerical controlled 3 axis milling machine using a own made tools and fastening device. The tool dimensions have been estimated in accordance with the algorithm shown in the literature [2]. All joints were made of end-to end (butt) configuration under different process parameters. The effect of selected technological parameters on the quality of the joint was analyzed. Produced butt joint have been subjected to a static tensile testing to identify mechanical features of the materials of joints compared to parent materials. Measurements of micro hardness HV in the plastically formed stir zone of joint and in the parent material have been carried out. Axial and radial welding forces in the joining region were recorded during the tests and their dependency from the welding parameters was studied . Based on results of strength tests the efficiency of joints for sheets of 0.5 mm in thicknesses oscillated up to 90% compared to the parent material. It has been found that for given parameters the correct, free of defects joints were obtained. The results suggests that FSW can be potentially applied to magnesium alloys.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 1; 45-54
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Friction Stir Welding of Ultrathin AA2024-T3 Aluminum Sheets Using Ceramic Tool
    Autorzy:
    Myśliwiec, P.
    Śliwa, R. E.
    Ostrowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/355870.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    friction stir welding
    aluminum alloys
    ceramic tools
    FSW force measurements
    low-cycle fatigue test
    FSW joint durability
    Opis:
    The paper presents the results of research work on linear FSW (Friction Stir Welding) joining aluminum alloys AA2024-T3 of 0.5 mm in thickness. The study was conducted on properly adapted numerical controlled 3 axis milling machine using a ceramic tool and special designed fastening device. The tool dimensions have been estimated according to the algorithm shown in the literature [4]. All joints were made of end-to end (butt) configuration under different welding speed. The rotational speed of the tool and tool offset was constant. The effect of selected technological parameters on the quality of the joint was analyzed. Produced butt joint have been subjected to a static tensile testing to identify mechanical features of the materials of joints compared to parent materials. Measurements of micro hardness HV in the plastically formed stir zone of joint and in the parent material have been carried out. Axial and radial welding forces in the joining region were recorded during the tests and their dependency from the welding parameters was studied. Based on the results of strength tests the efficiency of joints for sheets of 0.5 mm in thicknesses oscillated up to 96% compared to the parent material. It has been found that for given parameters the correct, free of defects joints were obtained. The paper also presents the results of low-cycle fatigue tests of obtained FSW joints. The use of a ceramic tool in the FSW process allows to obtain welds with higher strength than conventional tools. The results suggests that FSW can be potentially applied to joining aluminum alloys.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 4; 1385-1394
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Geometrical Parameters and Tools Material on the Quality of the Joint Made by FSW Method in AA2024 Thin Sheets
    Autorzy:
    Buszta, S.
    Myśliwiec, P.
    Śliwa, R. E.
    Ostrowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/353705.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    FSW
    FSW tools
    AA2024
    joining of shin sheets
    Opis:
    The paper presents the results of theoretical analysis and experimental research on the material’s influence and tool geometry on the welding speed and mechanical strength of Al 2024 thin sheet metal joints. To make the joints, tungsten carbide and ceramics tools with a smooth and modified surface of the shoulder were used. The choice of the geometrical parameters of the tool was adjusted to the thickness of the joined sheet. During welding, the values of axial and radial force were recorded to determine the stability of the process. The quality of the joint was examined and evaluated on the basis of visual analysis of the surface and cross-sections of the joint area and the parent material, and subjected to mechanical strength tests. The test results indicate that both the geometry of the tool shoulder and the tool material have a decisive influence on the quality of the joint and the welding speed, making it possible to shorten the duration of the entire process.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 2; 805-812
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Examinations of Selected Thermal Properties of Packages of SiC Schottky Diodes
    Autorzy:
    Bisewski, D.
    Myśliwiec, M.
    Górecki, K.
    Kisiel, R.
    Zarębski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/220523.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Schottky diodes
    transient thermal impedance
    thermal measurements
    silicon carbide
    packaging
    Opis:
    This paper describes the study of thermal properties of packages of silicon carbide Schottky diodes. In the paper the packaging process of Schottky diodes, the measuring method of thermal parameters, as well as the results of measurements are presented. The measured waveforms of transient thermal impedance of the examined diodes are compared with the waveforms of this parameter measured for commercially available Schottky diodes.
    Źródło:
    Metrology and Measurement Systems; 2016, 23, 3; 451-459
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Welding Parameters and Metal Arrangement of the AA2024-T3 on the Quality and Strength of FSW Lap Joints for Joining Elements of Landing Gear Beam
    Autorzy:
    Myśłiwiec, P.
    Śliwa, R. E.
    Ostrowski, R.
    Bujny, M.
    Zwolak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/356961.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    FSW lap joints
    aluminum alloys
    landing gear beam
    low cycle fatigue test
    Opis:
    The paper presents the possibility of using FSW technology for joining elements of a landing gear beam of the M28 aircraft. The FSW process was performed on a 4-axis numerical machine under industrial conditions. However, before welding was carried out under industrial conditions, preliminary experimental tests were carried out under laboratory conditions. Preliminary research was carried out for AA2024-T3 aluminum sheets of 1 mm and 3 mm in thickness, joined in a lap configuration. The influence of technological and geometric parameters of the process on the quality and strength of the weld was examined. Sheet metal arrangement was analyzed. Tests were carried out for two configurations. The first of which with 1 mm sheet on the top and 3 mm sheet on the bottom and in reverse order. It has been shown that setting a thicker plate on the top gives a 40% better strength. The microhardness and microstructure of the weld were tested. During the laboratory tests, low-cycle fatigue tests of the FSW lap joint were performed. It has been shown that the FSW method can be an alternative to the riveting process in the production of aviation structure elements.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 3; 1203-1216
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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