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    Wyświetlanie 1-6 z 6
    Tytuł:
    Influences on plasma cutting quality on CNC machine
    Autorzy:
    Kudrna, Lukas
    Fries, Jiri
    Merta, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2064923.pdf
    Data publikacji:
    2019
    Wydawca:
    STE GROUP
    Tematy:
    torch
    plasma arc
    cutting parameters
    Opis:
    This article discusses plasma cutting technology and its influences on the quality of the resulting cut. Plasma or a plasma arch consists of positive and negatively charged particles, excited and neutral atoms and molecules. As it contains free particles, it is electrically conductive and thus subject to the effects of the electrical and magnetic field. The basis of CNC machine design is described in the article, which has at least 3 axes (x, y, z), but there are also more technologically demanding applications, such as pipe cutting, profile and cutting using chamfer to prepare surfaces for welding, where these multi-axis devices are frequently used. The principle of plasma cutting and the plasma cutting phase is described in this article. The materials that can be divided by a plasma arc are described in detail, including graphs displaying the dependence of sheet thickness on the cutting speed. The article describes and lists the gases that are used in plasma-arc cutting, such as oxygen, argon, hydrogen and nitrogen. Important components of plasma cutting technology are the parameters that can be adjusted and set before the cutting so that the cut is of good quality. The most comprehensive chapter deals with the influences that affect plasma cutting quality. Cutting quality can be influenced by a number of factors. Everything starts with the proper choice of a CNC machine and a plasma source. The quality also depends on the expertise and experience of the machine operator and the setting of the plasma cutting parameters. This issue of influences on the plasma cutting quality is based on long-term experience in the field of the thermal cutting process.
    Źródło:
    Multidisciplinary Aspects of Production Engineering; 2019, 2, 1; 108--117
    2545-2827
    Pojawia się w:
    Multidisciplinary Aspects of Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Creation of linear DC plasma generator for pyrolysis/gasification of organic materials
    Autorzy:
    Tamošiunas, A.
    Grigaitiene, V.
    Valatkevičius, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/146630.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    plasma generator (plasma torch)
    pyrolysis
    gasification
    water vapor
    Opis:
    An experimental linear direct current (DC) plasma generator, with stepped anode, stabilized with air/water vapor, argon/water vapor and argon/air vortexes operating at atmospheric pressure had been designed and constructed in Plasma Processing Laboratory at Lithuanian Energy Institute (LEI, Kaunas). It was designed specially the innovative and environment-friendly plasma treatment of organic materials. Three different types of gas stabilization in plasma generator were experimentally investigated and their thermal and electrical characteristics were compared.
    Źródło:
    Nukleonika; 2011, 56, 2; 131-135
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polycyclic Aromatic Hydrocarbon Accumulation in Meats Singed with Kerosene and Waste Tyres: A Case for Public Health Concern in Nigeria
    Autorzy:
    Okareh, Oladapo T.
    Oshinloye, Oluwatoyin A.
    Abiodun, Dada
    Powiązania:
    https://bibliotekanauki.pl/articles/1840776.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Singeing torch
    Meat
    Waste Tyres
    Kerosene
    Poly Aromatic Hydrocarbon (PAH)
    Opis:
    Singeing is a common post slaughtering process of livestock and this has been associated with the introduction of high level of Polycyclic Aromatic Hydrocarbon (PAH) in the meats. There is dearth of information on alternative singeing technology for safe meat. Therefore, this study is aimed at proffering an alternative method for singeing livestock carcass as a post-slaughtering process to reduce accumulation of PAH in meat. An experimental study, involving the use of a singeing device (singeing torch) sourced locally was conducted. Singeing was carried out on a sacrificed goat using conventional methods and the Singeing Torch (ST). Five grams of meat samples singed with kerosene, tyres and the ST were collected from two abattoirs and observed for physical qualities. The physicochemical properties such as pH and PAH were determined using standard procedures. Results were compared with International Agency for Research in Cancer guidelines. Data were analyzed using descriptive statistics and ANOVA at 5% level of significance. Bright appearances with red coloration for ST singed meat while black patches and dull appearances were observed on meat singed with kerosene and tyres respectively. ST singed meat showed a better olfactory quality, a more neutral PH value and PAH of 7.3 and 3.30 (n/ng), while kerosene and tyre singed meat showed 6.8 pH value, 4.20 (n/ng) and 6.61 (n/ng) respectively with mean of 0.194±0.56, 0.248±0.94 and 0.389±1.21 respectively. The principal PAH compounds in ST meat identified were 1-Methylnaphthalene, 2-Methylnaphthalene, Acenaphthene, Pyrene and Benz(a)anthracene. This study indicates that meat singed with ST had lower PAH contents and better physical quality. The use of device and method that generates no chemical contaminants such as the ST should be encouraged for the singeing process of livestock carcasses as a strategy for the control of chemical contaminants of meat.
    Źródło:
    World News of Natural Sciences; 2021, 38; 49-59
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Infections caused by TORCH pathogens classified as “other”
    Zakażenia powodowane przez patogeny grupy TORCH określane jako "other"
    Autorzy:
    Fiedoruk, M.
    Laskowski, K.
    Tokarska-Rodak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2052612.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Bialska Nauk Stosowanych im. Jana Pawła II w Białej Podlaskiej
    Tematy:
    TORCH
    pregnancy
    foetus
    infections
    vaccinations
    prophylaxis
    ciąża
    płód
    zakażenia
    szczepienia
    profilaktyka
    Opis:
    The aim of this study was to present the characteristics of infections caused by the TORCH complex pathogens, identified as “others”, in women during pregnancy and their influence on the foetus. The “other” TORCH pathogens include: Treponema pallium, Listeria monocytogenes, Parvovirus B19, Varicella zoster virus, Measles virus, Myxovirusparotitis, influenza virus, viruses such as: HIV,HCV,HBC and also Chlamydia trachomatis. These pathogens are not only responsible for developing certain clinical symptoms in pregnant women but they also have a significant influence on child’s health and might be the cause of congenital disorders in infants. The consequences of TORCH infections may be visible in children directly after the birth, during infancy, or become present later, after several years. The most serious consequences are caused by foetal infection during early pregnancy. They may result in severe congenital disorders in foetus or cause miscarriage. Tests and examinations of women who plan pregnancy, and regular checks of the course of pregnancy allow for a proper care of mother and child.
    Celem pracy było przedstawienie charakterystyki zakażeń powodowanych przez patogeny kompleksu TORCH określane jako „others” u kobiet w okresie ciąży z uwzględnieniem ich wpływu na płód. Do patogenów „others” panelu TORCH należą: Treponema pallium, Listeriamonocytogenes, Parvovirus B19, Varicella zoster virus, Measlesvirus, Myxovirusparotitis, wirus grypy oraz wirusy HIV, HCV, HBV jak również Chlamydia trachomatis. Patogeny te odpowiedzialne są za generowanie określonych objawów klinicznych u ciężarnej lecz mają również istotny wpływ na zdrowie dziecka i mogą być przyczyną wad wrodzonych u noworodków. Skutki zakażenia drobnoustrojami z grupy TORCH mogą być widoczne u dzieci bezpośrednio po urodzeniu, w okresie niemowlęcym lub ujawniać się w latach późniejszych. Do najpoważniejszych konsekwencji prowadzą zakażenia płodu we wczesnym okresie ciąży. Mogą one nieść ze sobą ciężkie wady rozwojowe płodu lub powodować utratę ciąży. Badania kobiet planujących macierzyństwo i okresowe kontrole prawidłowości przebiegającej ciąży pozwalają na właściwą opiekę nad matką i dzieckiem.
    Źródło:
    Health Problems of Civilization; 2016, 10, 2; 55-63
    2353-6942
    2354-0265
    Pojawia się w:
    Health Problems of Civilization
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Double Fillet Welding of Carbon Steel T-Joint by Double Channel Shielding Gas Metal Arc Welding Method Using Metal Cored Wire
    Autorzy:
    Mert, T.
    Gultekin, N.
    Karaaslan, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/352453.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    double channel torch
    low carbon steel
    metal cored wires
    T-joint
    microstructure
    Opis:
    Low carbon steel material and T-joints are frequently used in ship building and steel constructions. Advantages such as high deposition rates, high quality and smooth weld metals and easy automation make cored wires preferable in these industries. In this study, low carbon steel materials with web and flange thicknesses of 6 mm, 8 mm and 10 mm were welded with conventional GMAW and double channel shielding gas metal arc welding (DMAG) method to form double fillet T-joints using metal cored wire. The difference between these two methods were characterized by measurements of mean welding parameters, Vickers hardness profiles, weld bead and HAZ geometry of the joints and thermal camera temperature measurements. When weld bead and HAZ geometries are focused, it was seen filler metal molten area increased and base metal molten area decreased in DMAG of low carbon steel. When compared with traditional GMAW, finer and acicular structures in weld metal and more homogenous and smaller grains in HAZ are obtained with double channel shielding gas metal arc welding.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2A; 947-954
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influences of the pre-chamber orifices on the combustion behavior in a constant volume chamber simulating pre-chamber type medium-speed gas engines
    Autorzy:
    Wakasugi, Takuya
    Tsuru, Daisuke
    Tashima, Hiroshi
    Powiązania:
    https://bibliotekanauki.pl/articles/2202520.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    gas engine
    prechamber
    torch flame
    combustion visualization
    natural gas
    silniki gazowe
    komora wstępna
    płomień palnika
    wizualizacja spalania
    gaz ziemny
    Opis:
    The study aims to clarify the influence of pre-chamber (PC) configurations on the combustion process in the main chamber (MC) of medium-speed spark-ignition gas engines equipped with an active PC. A constant volume combustion chamber was prepared to simulate the chamber configurations of the gas engines. A high-speed shadowgraph was applied to visualize the torch flame development and the combustion process in the MC. Experiments were done by changing the charged gas in the MC, the number, and the diameter of the PC orifices. Combustion was most accelerated when the PC orifice configuration was set appropriately so that the adjacent torch flames would combine with each other. It was also found that the unburned mixture in the PC, which ejected prior to the torch flame, supported the penetration of the torch flame.
    Źródło:
    Combustion Engines; 2022, 61, 4; 66--76
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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