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    Tytuł:
    Wpływ toksyn przemysłowych i substancji szkodliwych na organizm człowieka
    The impact of industrial toxins and harmful substances on the human body
    Autorzy:
    Zyska, A.
    Gawrys, W.
    Ślęzak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/952142.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
    Tematy:
    toksyny przemysłowe
    substancje endokrynnie czynne
    czynniki otyłogenne
    zaburzenia metabolizmu
    industrial toxins
    endocrine active substances
    obesity causing agents
    metabolic disorders
    Opis:
    Problemy zdrowotne w krajach wysoko uprzemysłowionych zarówno wśród dzieci, jak i dorosłych są wynikiem działania toksyn przemysłowych oraz substancji szkodliwych na organizm człowieka. Jednym z najważniejszych i niepożądanych efektów występowania toksyn przemysłowych jest wpływ na powstawanie nadwagi i otyłości, która została uznana przez Światową Organizację Zdrowia (WHO) za epidemię XXI wieku. Podłoże obecnej epidemii otyłości jest kontrowersyjne. Istniejąca hipoteza, iż otyłość jest konsekwencją braku równowagi pomiędzy spożyciem energii a brakiem aktywności fizycznej jest kwestionowana poprzez obserwacje i badania naukowe. Wysuwanych jest coraz więcej teorii na temat etiologii otyłości, nie związanych ze stylem życia, do których zalicza się między innymi: toksyny środowiskowe, substancje dodawane do żywności czy interakcję pomiędzy czynnikami genetycznymi i środowiskowymi. Artykuł przedstawia aktualny stan wiedzy na temat ryzyka zdrowotnego związanego z otyłością a czynnikami zewnętrznymi środowiskowymi wpływającymi na jej rozwój.
    The health problems in highly developed countries’ among children as well as adults are the results of industrial toxins and harmful substances on human body. One of the most important and most unwanted effects of occurance of industrial toxins is the impact on becoming overweight and obesity, which recognized by the World Health Organization (WHO) as the epidemics of the XX. The basis of the ongoing obesity epidemic is controversial. The existing hypothesis that obesity is the consequence of the lack of balance between the energy intake and the lack of physical activity is challenged by observations and scientific research. More and more theories on the etiology of obesity not connected with lifestyle are proposed. According to these theories obesity may be attributed to other factors such as: environmental toxins, food additives or the interaction between genetic and environmental agents. The article presents the current state of knowledge on health risk connected to obesity and external factors - environmental agents facilitating the emergence of obesity.
    Źródło:
    Prace Naukowe Akademii im. Jana Długosza w Częstochowie. Technika, Informatyka, Inżynieria Bezpieczeństwa; 2018, T. 6; 779-789
    2300-5343
    Pojawia się w:
    Prace Naukowe Akademii im. Jana Długosza w Częstochowie. Technika, Informatyka, Inżynieria Bezpieczeństwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling of Dendritic Structure Evolution During Solidification of Al-Cu Alloy
    Autorzy:
    Zyska, A.
    Boroń, K.
    Kordas, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/382278.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    alloy solidification
    cellular automata
    AlCu alloy
    structure modeling
    krzepnięcie stopu
    automat komórkowy
    stop AlCu
    modelowanie struktury
    Opis:
    The paper presents the cellular automaton (CA) model for tracking the development of dendritic structure in non-equilibrium solidification conditions of binary alloy. Thermal, diffusion and surface phenomena have been included in the mathematical description of solidification. The methodology for calculating growth velocity of the liquid-solid interface based on solute balance, considering the distribution of the alloy component in the neighborhood of moving interface has been proposed. The influence of solidification front curvature on the equilibrium temperature was determined by applying the Gibbs Thomson approach. Solute and heat transfer equations were solved using the finite difference method assuming periodic boundary conditions and Newton cooling boundary condition at the edges of the system. The solutal field in the calculation domain was obtained separately for solid and liquid phase. Numerical simulations were carried out for the Al-4 wt.% Cu alloy at two cooling rates 15 K/s and 50 K/s. Microstructure images generated on the basis of calculations were compared with actual structures of castings. It was found that the results of the calculations are agreement in qualitative terms with the results of experimental research. The developed model can reproduce many morphological features of the dendritic structure and in particular: generating dendritic front and primary arms, creating, extension and coarsening of secondary branches, interface inhibition, branch fusion, considering the coupled motion and growth interaction of crystals.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 4; 87-92
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the Home Scrap Content on the Service Life of Equipment Used in High Pressure Die Casting of AZ91 Alloy
    Autorzy:
    Konopka, Z.
    Łągiewka, M.
    Zyska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/383091.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative casting material
    innovative casting technology
    automation of casting process
    mechanization of casting process
    guard of environment
    casthouse rigging
    magnesium alloy
    innowacyjny materiał odlewniczy
    innowacyjna technologia odlewnicza
    automatyzacja procesu odlewniczego
    mechanizacja procesu odlewniczego
    ochrona środowiska
    stop magnezu
    Opis:
    The results of estimation of home scrap addition in charge influence on durability and wear of casting instrumentation life in the high-pressure casting technology using the hot chamber machine of alloy of AZ91 are presented. The wear of the following elements of the casting instrumentation so-called "casting set" as: syphon, plunger, sliding-rings, nozzle and injection moulding nozzle was estimated. A wear was estimated quantitative by registering the number of mould injections for different charges to the moment of element damage supervision. A damage had to be at such level that liquidated an element from further exploitation and necessary was an exchange on new or regeneration. In a final result allowed it the detailed determination of durability of the applied rigging elements in dependence on the type of the applied type of melt. It is noticed, that together with the increase of home-scrap participation in the charge wear of pressure machine instrumentation elements increases.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 2; 173-176
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Cast Iron Modification on Free Vibration Frequency of Casting
    Autorzy:
    Konopka, Z.
    Łągiewka, M.
    Zyska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/383158.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gray cast iron
    modification process
    free vibration
    casting
    vibration frequency of casting
    żeliwo szare
    proces modyfikacji
    drgania swobodne
    odlewy
    częstotliwość drgań odlewu
    Opis:
    The paper presents the results of investigations concerning the influence of gray cast iron modification on free vibration frequency of the disc casting. Three different chemical composition melts of gray cast iron were prepared in induction furnace. During gravity casting 0.05% and 0.3% mass of the Inolate modifier was added on stream of metal for changing graphite flakes in castings. Sound signal vibration of cast iron sample was registered by means on microphone for free vibration frequency measurements. Decreasing of free vibration frequency of modified cast iron in comparison with non modified castings was observed. Higher contents of modifier causes more decreasing of free vibration frequency. Cast iron with smaller contents of carbon and silicon have higher free vibration frequency in comparison with eutectic composition cast iron. Hardness of examined cast iron is lower when the more modifier is added during modification process. Free frequency is smaller with smaller Brinell hardness of disc casting. It was concluded that control of free vibration frequency of disc castings by means of chemical composition and modification process can improved comfort and safety of working parts.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 1; 23-26
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact strength of squeeze casting AlSi13Cu2–CF composite
    Autorzy:
    Zyska, A.
    Konopka, Z.
    Łągiewka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/946862.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    casting composites
    squeeze method
    carbon fibers
    impact strength
    microstructure
    kompozyty
    metoda wyciskania
    włókna węglowe
    siła uderzenia
    mikrostruktura
    Opis:
    The paper presents the results of research on microstructure and impact strength of AlSi13Cu2 matrix composite reinforced by Ni-coating carbon fibers (CF) with a volume fraction of 5%, 10% and 15%. The composite suspensions were prepared using by stirring method and subsequently squeeze casted under different pressures of 25, 50, 75 and 100 MPa. As part of the study, fiber distribution in aluminum matrix was evaluated and variation in impact strength of composite as a function of the carbon fibers volume fraction and pressure applied were determined. It has been found that the presence of Ni coating on carbon fibers clearly improves their wettability by liquid aluminum alloy and in combination with the stirring parameters applied, composite material with relatively homogeneous structure can be produced. Charpy's test showed that the impact strength of composite reaches the highest value by carrying out the squeeze casting process at 75 MPa. In the next stage of research, it was found that the impact strength of composites increases with the increase of carbon fibers volume fraction and for 15% of fibers is close to 8 J/cm2. Observations of fracture surfaces have revealed that crack growth in the composites propagates with a quasi-cleavage mechanism. During the creation of the fracture, all fibers arranged perpendicular to its surface were sheared. At the same time, the metal matrix around the fibers deformed plastically creating characteristic ductile breaks. The fracture surface formation through the fibers indicates a cohesive and strong connection of the reinforcement with the matrix. In addition to the phenomena mentioned, debonding the fiber-matrix interfaces and the formation of voids between components were observed on the fracture surface.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 2; 49-52
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zalety i wady stosowania substancji dodatkowych do żywności
    Advantages and disadvantages of using additives for food
    Autorzy:
    Zyska, A.
    Pawlak, A.
    Ślęzak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/103714.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
    Tematy:
    substancje dodatkowe do żywności
    żywność wygodna
    prawo żywnościowe
    food additives
    convenient food
    food legal regulation
    Opis:
    Substancje dodatkowe do żywności budzą sprzeczne reakcje tak wśród producentów, jak i konsumentów. Z jednej strony służą podnoszeniu atrakcyjności oraz jakości produktów, drugiej – budzą zaniepokojenie konsumentów wynikające z niewiedzy oraz przekazu marketingowego w środkach masowego przekazu takiego jak: radio, TV czy Internet. Świadomość konsumentów na temat bezpieczeństwa dodatków do żywności oraz ich roli, jaką pełnią w przemyśle spożywczym i przetwórstwie żywności, jest niewielka. Niniejszy artykuł jest przeglądem literatury polskiej dotyczącej obecności substancji dodatkowych w żywności z uwzględnieniem aktualnych aktów prawnych dotyczących stosowania ich w produkcji żywności. Wykazano korzyści, jak również zagrożenia wynikające z nadmiernego ich stosowania.
    Food additives give rise to contradictory reactions both among producers and consumers. On the one hand they serve to increase the attractiveness and quality of the products, on the other hand - induce consumers’ concern arising from ignorance and marketing communication in the mass media such as radio, TV or the internet. Consumers’ awareness on the safety of food additives and their role in the food industry and processing is still small. This article is a review of the Polish literature concerning the application of additives in food processing taking into consoderation the current legislation on food additives usage. The advantages and risks resulting from using such substances in excess in food have been shown.
    Źródło:
    Prace Naukowe Akademii im. Jana Długosza w Częstochowie. Technika, Informatyka, Inżynieria Bezpieczeństwa; 2018, T. 6; 33-43
    2300-5343
    Pojawia się w:
    Prace Naukowe Akademii im. Jana Długosza w Częstochowie. Technika, Informatyka, Inżynieria Bezpieczeństwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Badanie wpływu podciśnienia w formie na chropowatość powierzchni odlewów
    Studies of the effect of negative pressure in the mould on the cast surface roughness
    Autorzy:
    Łągiewka, M.
    Konopka, Z.
    Zyska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/391577.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
    Tematy:
    odlewanie ciśnieniowe
    stopy aluminium
    chropowatość powierzchni
    pressure casting
    aluminium alloys
    surface roughness
    Opis:
    W artykule przedstawiono wyniki badań wpływu podciśnienia w formie i układzie zalewania na chropowatość powierzchni odlewów. Badania chropowatości powierzchni wykonano na odlewach ze stopu EN AB 46000 wykonanych metodą odlewania ciśnieniowego na maszynie Vertacast z zastosowaniem zmiennego podciśnienia w formie. Stwierdzono zmniejszenie chropowatości powierzchni odlewów ze zmniejszeniem ciśnienia w formie na podstawie wartości różnych charakterystycznych parametrów chropowatości. Badania chropowatości odlewów wykonano na urządzeniu Hommel Tester T1000.
    The article discusses the results of the studies of the effect of negative pressure in the mould and the casting system on the roughness of the casts' surfaces. Roughness tests were performed on casts made of alloy EN AB 46000, by means of the pressure casting method in the Vertacast machine, and with the use of varying negative pressure in the mould. The surface roughness of the casts decreasing with a decrease in the pressure in the mould was determined based on the values of different characteristic surface roughness parameters. The cast roughness examinations were conducted on the Hommel Tester T1000 device.
    Źródło:
    Prace Instytutu Odlewnictwa; 2018, 58, 1; 3-11
    1899-2439
    Pojawia się w:
    Prace Instytutu Odlewnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Home Scrap on Porosity of MgAl9Zn1 Alloy Pressure Castings
    Autorzy:
    Konopka, Z.
    Chojnacki, A.
    Łągiewka, M.
    Zyska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/381808.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innowacyjne technologie odlewnicze
    innowacyjne materiały odlewnicze
    automatyzacja w odlewni
    robotyka w odlewni
    ochrona środowiska
    porowatość
    stopy magnezu
    innovative foundry technologies
    innovative foundry materials
    automation in foundry
    robotics in foundry
    environmental protection
    porosity
    magnesium alloys
    Opis:
    The work presents the results of examinations concerning the influence of various amounts of home scrap additions on the porosity of castings made of MgAl9Zn1 alloy. The fraction of home scrap in the metal charge ranged from 0 to 100%. Castings were pressure cast by means of the hot-chamber pressure die casting machine under the industrial conditions in one of the domestic foundries. Additionally, for the purpose of comparison, the porosity of specimens cut out directly of the MgAl9Zn1 ingot alloy was also determined. The examinations consisted in the qualitative assessment of porosity by means of the optical microscopy and its quantitative determination by the method of weighting specimens in air and in water. It was found during the examination that the porosity of castings decreases with an increase in the home scrap fraction in the metal charge. The qualitative examinations confirmed the beneficial influence of the increased home scrap fraction on the porosity of castings. It was concluded that the reusing of home scrap in a foundry can be a good way of reduction of costs related to the production of pressure castings.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 1; 99-102
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Castability and Structure of Dental Alloys on a Nickel Base
    Autorzy:
    Zyska, A.
    Konopka, Z.
    Łągiewka, M.
    Kordas, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/382918.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dental alloys
    centrifugal casting
    castability
    nickel alloys
    stopy dentystyczne
    odlewanie odśrodkowe
    lojalność
    stopy niklu
    Opis:
    The results of castability and structures researches of two nickel base alloys - Ceranium CN and Magnum AN applied on casting of the crowns and dental bridges are presented. Studies were carried out on the alloys cast under the centrifugal force to the moulds made by the lost wax method using production line of ROKO. Having regard to a specific technology of casting and possibility of ROKO production line, to the estimation of alloys castability a spiral test was adjusted with a 0,8 mm and a 2,5 mm diameter of test casting. Measuriements executed on a 20 test castings allowed to establish, that castability of Magnum AN alloy was 65 % greater than castability of Ceranium NC alloy. The results of thermodynamics calculations of the equilibrium and nonequilibrium crystallization (Scheil model) of the investigated alloys are presented too. The characteristic temperatures of phase transformation and forecast phase composition of alloys for both kind of crystallization were calculated. It is established after structural supervisions, that the investigated alloys crystallize in dendryte form and in centrifugal casting conditions have cooling rate sensivity and inclination to texture structure forming in outmost layer of casting. Phase composition of alloys corresponds to the results of thermodynamics calculations of the nonequilibrium crystallization conditions.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 1; 139-144
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of heat accumulation coefficient for oil bonded moulding sands
    Autorzy:
    Łągiewka, M.
    Konopka, Z.
    Zyska, A.
    Nadolski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/379643.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    theoretical basis
    casting processes
    moulding material
    oil binder
    heat accumulation coefficient
    moulding sand
    temperature equalization coefficient
    podstawy teoretyczne
    proces odlewniczy
    materiał formierski
    spoiwo olejowe
    współczynnik akumulacji ciepła
    masa odlewnicza
    Opis:
    The possibility of controlling the solidification and cooling time of castings creates prospects of improving their structure and by the same their properties. Thermal properties of the mould constitute therefore an important factor which is necessary to consider while seeking for the mentioned improvement. The presented work illustrates the method of determining some basic thermal coefficients of moulding material, i.e. the coefficient of temperature equalisation a2, known also as the temperature diffusivity, and the heat accumulation coefficient b2, which characterises the ability of moulding material to draw away the heat from a casting. The method consists in experimental determining the temperature field within the mould during the processes of pouring, solidification and cooling of the casting. The performed measurements allow for convenient and exact calculations of the sought-after coefficients. Examinations were performed for the oil bonded moulding sand of trade name OBB SAND ‘E’. The experiment showed that the obtained value of b2 coefficient differs from the value calculated on the basis of theoretical considerations available in publications. Therefore it can be stated that theoretical calculations of the heat accumulation coefficient are thus far not sufficient and not quite reliable, so that these calculations should be verified experimentally.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 2; 91-94
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of the Method of Mould Filling on the Quality of Castings Made of EN AC-44000 or EN AC-46200 Alloy
    Autorzy:
    Nadolski, M.
    Konopka, Z.
    Łągiewka, M.
    Zyska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/380335.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry materials
    innovative foundry technologies
    plaster mould
    counter-gravity casting
    vacuum casting
    innowacyjne materiały odlewnicze
    innowacyjne technologie odlewnicze
    forma odlewnicza
    odlewanie próżniowe
    Opis:
    The performed examinations concerning the process of filling the plaster ceramic moulds with aluminium alloys allowed to assess the influence of various methods of introducing the metal into the mould cavity on the macro- and microstructure of the obtained experimental castings. The comparison was performed for castings with graded wall thickness made either of EN AC-44000 alloy or of EN AC-46000 alloy, produced either by gravity casting, or by gravity casting with negative pressure generated around the mould (according to the Vacumetal technology), or by counter-gravity casting. It was found that the silicon crystals grow in size with an increase in wall thickness due to the slower cooling and solidification of castings.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 4; 73-76
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Graphite Type on the Abrasive Wear of AlMg10 Matrix Composites
    Autorzy:
    Łągiewka, M.
    Konopka, Z.
    Zyska, A.
    Nadolski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380925.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cast composites
    abrasion resistant alloys
    graphite particles
    alloy AlMg
    electrographite
    kompozyty
    stopy odporne na ścieranie
    cząsteczki grafitu
    stop AlMg
    elektrografit
    Opis:
    The presented work discuss the influence of various types of graphite additions on the abrasive wear of AlMg10 matrix alloy composites. Flake graphite, electrographite, and short graphite fibre were used as a composite reinforcement. Composites containing 10 vol. % of graphite particles were produced by mechanical mixing of the liquid alloy with simultaneous introduction of the reinforcement. Composite suspensions were gravity cast into metal moulds. The achieved castings were tested for the abrasive wear. Also the pure matrix alloy was examined. Microphotographs of the produced materials were taken, the specimens were also examined after the abrasion test by observing the microsections perpendicular to the abraded surface. The carried out experiments allow to state that even the little addition of graphite influences beneficially the tribological properties of composite under small loads applied to the frictional pair. It was found that under the increased load (30 N) the least abrasive wear is exhibited by the composite reinforced with graphite fibre, the largest one occurring for the composite reinforced with electrographite. The composite reinforced with electrographite, however, exhibited the mass loss less by 25% than the pure matrix alloy.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 1 spec.; 65-68
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of the strengthening coefficient of pressure cast AlSi13Cu2/chopped carbon fibre composite
    Wyznaczenie współczynnika umocnienia kompozytu AlSi13Cu2-cięte włókna węglowe odlewanego ciśnieniowo
    Autorzy:
    Konopka, Z.
    Łągiewka, M.
    Nadolski, M.
    Zyska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/354794.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metal matrix composites
    pressure die casting
    strengthening
    kompozyty z osnową metaliczną (MMC)
    odlewanie ciśnieniowe
    umocnienie
    Opis:
    The purpose of the work is the determination of the strengthening coefficient for the AlSi13Cu2 alloy matrix composite reinforced with chopped carbon fibre and produced by high-pressure casting method. This coefficient was determined during the static tensile test using the Ramberg-Osgood equation. The regression relationships between strain and stress were established, serving as a basis for finding the strengthening coefficient values. The measurements and calculations were performed also for the matrix alloy itself, for the purpose of comparison. The examined coefficient decreased with an increase of fibre fraction in the composite. Its value for composite containing 15 vol. % of chopped fibre was found to be lower by 30% than the value determined for matrix alloy, what means the strengthening of the alloy to such a degree.
    Celem pracy jest wyznaczenie współczynnika umocnienia kompozytu na osnowie stopu AlSi13Cu2 zbrojonego ciętymi włóknami węglowymi wytworzonego metodą ciśnieniowego odlewania. Współczynnik ten wyznaczono w statycznej próbie rozciągania korzystając z równania Ramberga-Osgooda. Opracowano regresyjne zależności odkształcenia i naprężenia, na podstawie których wyznaczono współczynnik umocnienia. Dla porównania wykonano pomiary dla stopu osnowy bez włókien. Stwierdzono zmniejszenie się tego współczynnika ze wzrostem udziału włókien w kompozycie. Jego wartość dla kompozytu zawierającego 15% obj. ciętych włókien jest o około 30% niższa od wartości wyznaczonej dla stopu osnowy, co oznacza, że materiał został w takim stopniu umocniony.
    Źródło:
    Archives of Metallurgy and Materials; 2013, 58, 3; 957-960
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Pressure Die Casting Parameters on the Castability of AlSi11-SiCp Composites
    Autorzy:
    Konopka, Z.
    Zyska, A.
    Łągiewka, M.
    Nadolski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/382419.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    composite casting
    pressure die casting
    castability of composite
    kompozyt odlewany
    odlewanie ciśnieniowe
    lejność kompozytu
    Opis:
    The paper presents the method of preparing a composite slurry composed of AlSi11 alloy matrix and 10 vol.% of SiC particles, as well as the method of its high-pressure die casting and the measurement results concerning the castability of the obtained composite. Composite castings were produced at various values of the piston velocity in the second stage of injection, diverse intensification pressure values, and various injection gate width values. There were found the regression equations describing the change of castability of the examined composite as a function of pressure die casting process parameters. The conclusion gives the analysis and the interpretation of the obtained results.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 1; 29-34
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    ThermoCalc Application for the Assessment of Binary Alloys Non-Equilibrium Solidification
    Autorzy:
    Zyska, A.
    Konopka, Z.
    Łągiewka, M.
    Kordas, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/383280.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    program TermoCalc
    krzepnięcie nierównowagowe
    model Wołczyńskiego
    segregacja
    stopy binarne
    Thermo-Calc
    non-equilibrium solidification
    segregation
    Wołczyński model
    binary alloys
    Opis:
    The paper presents the possibility of application of the developed computer script which allows the assessment of non-equilibrium solidification of binary alloys in the ThermoCalc program. The script makes use of databases and calculation procedures of the POLY-3 module. A solidification model including diffusion in the solid state, developed by Wołczyński, is used to describe the non-equilibrium solidification. The model takes into account the influence of the degree of solute segregation on the solidification process by applying the so-called back-diffusion parameter. The core of the script is the iteration procedure with implemented model equation. The possibility of application of the presented calculation method is illustrated on the example of the Cr-30% Ni alloy. Computer simulations carried out with use of the developed script allow to determine the influence of the back-diffusion parameter on the course of solidification curves, solidus temperature, phase composition of the alloy and the fraction of each phase after the solidification completion, the profile of solute concentration in liquid during solidification process, the average solute concentration in solid phase at the eutectic temperature and many other quantities which are usually calculated in the ThermoCalc program.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 1; 163-168
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and selected properties of high-aluminium Zn alloy with silicon addition
    Autorzy:
    Zyska, A.
    Konopka, Z.
    Łągiewka, M.
    Nadolski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/379494.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ZnAl alloy
    tribological properties
    thermal expansion
    stop ZnAl
    właściwości trybologiczne
    rozszerzalność cieplna
    Opis:
    The results of examinations concerning the abrasive wear resistance, hardness, and thermal expansion of high-aluminium zinc alloys are presented. The examinations were carried out for five synthetic ZnAl28 alloys with variable silicon content ranging from 0.5% to 3.5%, and – for the purpose of comparison – for the standardised ZnAl28Cu4 alloy. It was found that silicon efficiently increases the tribological properties and decreases the coefficient of thermal expansion of zinc alloys. The most advantageous set of the examined properties is exhibited by the alloys containing over 2.5% Si. They are characterised by higher parameters as compared with the standardised alloy. Observations of microstructures reveal that silicon precipitates as a separate compact phase, and its morphology depends on the Si content in the alloy. The performed examinations show that silicon can satisfactorily replace copper in high aluminium Zn alloys, thus eliminating the problem of dimensional instability of castings.
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 3 spec.; 261-264
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of benzoyl peroxide on gelation rate of silica binder for precision casting
    Autorzy:
    Nadolski, M.
    Konopka, Z.
    Łągiewka, M.
    Zyska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/379607.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    precision casting
    moulding material
    colloidal silica
    odlewanie precyzyjne
    materiał formierski
    krzemionka koloidalna
    Opis:
    Substituting of ethyl silicate with ecologic sols of colloidal silica in the investment casting technology, resulting from the increased demands concerning environmental protection, caused the prolongation of production cycle for precision castings produced in multi-layer thin-walled ceramic shell moulds. Modification of Sizol 030 binder with benzoyl peroxide, proposed in the paper, was aimed at restriction of time needed for realization of a single layer of the shell mould, and by the same, of such a mould as a whole. Examination of kinetics of the drying process were held for the layers made of prepared moulding material and the influence of binder modification on the mould curing time was determined.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 2; 99-102
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Porosity of Castings Produced by the Vacuum Assisted Pressure Die Casting Method
    Autorzy:
    Zyska, A.
    Konopka, Z.
    Łągiewka, M.
    Nadolski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/379699.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technology
    aluminium alloy
    vacuum assisted pressure
    die casting
    casting defect
    porosity
    innowacyjna technologia odlewnicza
    stop aluminium
    formowanie podciśnieniowe
    odlewanie ciśnieniowe
    wada odlewu
    porowatość
    Opis:
    The paper presents the results of investigations concerning the influence of negative (relative) pressure in the die cavity of high pressure die casting machine on the porosity of castings made of AlSi9Cu3 alloy. Examinations were carried out for the VertaCast cold chamber vertical pressure die casting machine equipped with a vacuum system. Experiments were performed for three values of the applied gauge pressure: -0.3 bar, -0.5 bar, and -0.7 bar, at constant values of other technological parameters, selected during the formerly carried initial experiments. Porosity of castings was assessed on the basis of microstructure observation and the density measurements performed by the method of hydrostatic weighing. The performed investigation allowed to find out that – for the examined pressure range – the porosity of castings decreases linearly with an increase in the absolute value of negative pressure applied to the die cavity. The negative pressure value of -0.7 bar allows to produce castings exhibiting porosity value less than 1%. Large blowholes arisen probably by occlusion of gaseous phase during the injection of metal into the die cavity, were found in castings produced at the negative pressure value of -0.3 bar. These blowholes are placed mostly in regions of local thermal centres and often accompanied by the discontinuities in the form of interdendritic shrinkage micro-porosity. It was concluded that the high quality AlSi9Cu3 alloy castings able to work in elevated temperatures can be achieved for the absolute value of the negative pressure applied to the die cavity greater than 0.5 bar at the applied set of other parameters of pressure die casting machine work.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 1; 125-130
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Assessment of Modification of High-Zinc Aluminium Alloy
    Autorzy:
    Zyska, A.
    Konopka, Z.
    Łągiewka, M.
    Nadolski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380248.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminium alloys
    inoculation
    solidification
    mechanical properties
    stopy aluminium
    krzepnięcie
    właściwości mechaniczne
    Opis:
    The results of examinations of the influence of titanium-boron inoculant on the solidification, the microstructure, and the mechanical properties of AlZn20 alloy are presented. The examinations were carried out for specimens cast both of the non-modified and the inoculated alloy. There were assessed changes in the alloy overcooling during the first stage of solidification due to the nuclei-forming influence of the inoculant. The results of quantitative metallographic measurements concerning the refinement of the grain structure of casting produced in sand moulds are presented. The cooling rate sensitivity of the alloy was proved by revealing changes in morphology of the α-phase primary crystals. Differences in mechanical properties resulting from the applied casting method and optional inoculation were evaluated.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 2; 53-56
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of the Mould Filling Conditions on the Quality of Castings Made of EN AC-44000 Alloy
    Autorzy:
    Nadolski, M.
    Konopka, Z.
    Łągiewka, M.
    Zyska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/380440.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry materials
    innovative foundry technologies
    plaster mould
    counter-gravity casting
    vacuum casting
    innowacyjne materiały odlewnicze
    innowacyjne technologie odlewnicze
    forma odlewnicza
    odlewanie próżniowe
    Opis:
    The work deals with the influence of change in the filling conditions of the ceramic moulds with plaster binder on the presence of gaseous porosity and the microstructure of the achieved test castings with graded wall thickness. Castings made of EN AC-44000 alloy, produced either by gravity casting, or by gravity casting with negative pressure generated around the mould (according to the Vacumetal technology), or by counter-gravity casting were compared. The results of examinations concerning the density of the produced castings indicate that no significant change in porosity was found. The increased size of silicon crystals was found for the increased wall thicknesses due to the slower cooling and solidification of castings.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 2; 19-22
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Vacuum Assistance on the Quality of Castings Produced by High Pressure Die Casting Method
    Autorzy:
    Łągiewka, M.
    Konopka, Z.
    Nadolski, M.
    Zyska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/380704.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technologies
    aluminium alloys
    quality of castings
    surface roughness
    defects in pressure die castings
    innowacyjne technologie odlewnicze
    stopy aluminium
    jakość odlewów
    chropowatość powierzchni
    defekty
    Opis:
    The presented work is aimed to deal with the influence of changes in the value of negative (relative) pressure maintained in the die cavity of pressure die casting machine on the surface quality of pressure castings. The examinations were held by means of the modified Vertacast pressure die casting machine equipped with a vacuum system. Castings were produced for the parameters selected on the basis of previous experiments, i.e. for the plunger velocity in the second stage of injection at the level of 4 m/s, the pouring temperature of the alloy equal to 640°C, and the die temperature of 150°C. The examinations were carried on for three selected values of negative gauge pressure: - 0.03, - 0.05, and - 0.07 MPa. The quality of casting was evaluated by comparing the results of the surface roughness measurements performed for randomly selected castings. The surface roughness was measured by means of Hommel Tester T1000. After a series of measurements it was found that the smoothest surface is exhibited by castings produced at negative gauge pressure value of - 0.07 MPa.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 2; 23-26
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of squeeze parameters and modification of AlSi7Mg alloy
    Autorzy:
    Zyska, A.
    Konopka, Z.
    Łągiewka, M.
    Nadolski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/381007.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mechanical properties
    Al alloy
    squeeze casting technology
    modification
    właściwości mechaniczne
    stop Al
    technologia prasowania
    modyfikacja
    Opis:
    The paper present the examination results concerning mechanical properties of castings made of AlSi7MG alloy in correlation both with the most significant squeeze casting parameters and with the modification treatment. Experiments were planned and held according to the 23 factorial design. The regression equations describing the influence of the squeeze pressure, the mould temperature, and the quantity of strontium modifier on the strength and elongation of the examined alloy were obtained. It was found that the main factor controlling the strength increase is the squeeze pressure, while the plasticity (A5) of the alloy is affected most advantageously by modification. The application of modification treatment in squeeze casting technology enables for production of the slab-type castings made of AlSi7Mg alloy exhibiting strength at the level of 230 MPa and elongation exceeding 14%.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 2; 113-116
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of the Dendritic Crystallization by the Cellular Automaton Method
    Autorzy:
    Zyska, A.
    Konopka, Z.
    Łągiewka, M.
    Nadolski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/381219.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    binary alloys
    crystallization
    numerical modelling
    cellular automata
    structure modeling
    stop dwuskładnikowy
    krystalizacja
    modelowanie numeryczne
    metoda automatów komórkowych
    Opis:
    A numerical model of binary alloy crystallization, based on the cellular automaton technique, is presented. The model allows to follow the crystallization front movement and to generate the images of evolution of the dendritic structures during the solidification of a binary alloy. The mathematic description of the model takes into account the proceeding thermal, diffusive, and surface phenomena. There are presented the results of numerical simulations concerning the multi-dendritic growth of solid phase along with the accompanying changes in the alloying element concentration field during the solidification of Al + 5% wt. Mg alloy. The model structure of the solidified casting was achieved and compared with the actual structure of a die casting. The dendrite interaction was studied with respect to its influence on the generation and growth of the primary and secondary dendrite arms and on the evolution of solute segregation both in the liquid and in the solid state during the crystallization of the examined alloy. The morphology of a single, free-growing dendritic crystal was also modelled. The performed investigations and analyses allowed to state e.g. that the developed numerical model correctly describes the actual evolution of the dendritic structure under the non-equilibrium conditions and provides for obtaining the qualitatively correct results of simulation of the crystallization process.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 1; 99-106
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Home Scrap on Mechanical Properties of MgAl9Zn1 Alloy Castings
    Autorzy:
    Konopka, Z.
    Chojnacki, A. C.
    Łągiewka, M.
    Zyska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/382859.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technologies
    innovative foundry materials
    automation in foundry
    robotics in foundry
    environmental protection
    mechanical properties
    magnesium alloys
    innowacyjne technologie odlewnicze
    innowacyjne materiały odlewnicze
    automatyzacja w odlewni
    robotyka w odlewni
    ochrona środowiska
    właściwości mechaniczne
    stopy magnezu
    Opis:
    The work presents the results of examinations concerning the influence of various amounts of home scrap additions on the properties of castings made of MgAl9Zn1 alloy. The fraction of home scrap in the metal charge ranged from 0 to 100%. Castings were pressure cast by means of the hot-chamber pressure die casting machine under the industrial conditions in one of the domestic foundries. The examinations consisted in the determination of the following properties: tensile strength Rm, yield strength Rp0.2, and the unit elongation A5, all being measured during the static tensile test. Also the hardness measurements were taken by the Brinell method. It was found that the mechanical properties (mainly the strength properties) are being improved up to the home scrap fraction of 50%. Their values were increased by about 30% over this range. Further rise in the home scrap content, however, brought a definite decrease in these properties. The unit elongation A5 exhibited continual decrease with an increase in the home scrap fraction in the metal charge. A large growth of hardness was noticed for the home scrap fraction increasing up to the value of 50%. Further increasing the home scrap percentage, however, did not result in a significant rise of the hardness value any more.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 2; 39-42
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Correlations Between Arrangement of Reinforcing Particles and Mechanical Properties in Pressure Die Cast AlSi11-SiC Composites
    Autorzy:
    Konopka, Z.
    Pasieka, A.
    Łągiewka, M.
    Nadolski, M.
    Zyska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/380134.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pressure die casting
    metal matrix composites (MMCs)
    aluminium alloys
    structure
    mechanical properties
    odlewnictwo ciśnieniowe
    kompozyty metalowe (MMC)
    stopy aluminium
    struktura
    właściwości mechaniczne
    Opis:
    The work presents the investigation results concerning the structure of composite pressure die castings with AlSi11 alloy matrix reinforced with SiC particles. Examination has been held for composites containing 10 and 20 volume percent of SiC particles. The arrangement of the reinforcing particles within the matrix has been qualitatively assessed in specimens cut out of the castings. The index of distribution was determined on the basis of particle count in elementary measuring fields. The tensile strength, the yield point and elongation of the obtained composite were measured. Composite castings were produced at various values of the piston velocity in the second stage of injection, diverse intensification pressure values, and various injection gate width values. The regression equation describing the change of the considered arrangement particles index and mechanical properties were found as a function of the pressure die casting parameters. The infuence of particle arrangement in composite matrix on mechanical properties these material was examined and the functions of correlations between values were obtained. The conclusion gives the analysis and the interpretation of the obtained results.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 2; 31-36
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The assessment of bell casting producibility based on computer simulation of pouring and solidification
    Autorzy:
    Nadolski, M.
    Zyska, A.
    Konopka, Z.
    Łągiewka, M.
    Karolczyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/381931.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bell casting
    artistic casting
    computer simulation
    odlewanie dzwonu
    odlewnictwo artystyczne
    symulacja komputerowa
    Opis:
    The work estimates the possibility of modification of the traditional production method of bell castings taking into account calculations performed by NovaFlow&Solid simulation program. Changes are evaluated with regard to the arrangement of the shrinkage defects in castings, which are of influence on the acoustic and mechanical properties of castings.
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 3 spec.; 141-144
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physical and Numerical Modeling of Duplex Cast Steel Thin-Walled Castings
    Autorzy:
    Stradomski, G.
    Nadolski, M.
    Zyska, A.
    Kania, B.
    Rydz, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/351674.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    duplex cast steel
    centrifugal casting
    gravity casting
    thin-walled castings
    Opis:
    The paper, which is a summary and supplement of previous works and research, presents the results of numerical and physical modeling of the GX2CrNiMoCuN25-6-3 duplex cast steel thin-walled castings production. To obtain thin-walled castings with wall in the thinnest place even below 1 mm was used the centrifugal casting technology and gravity casting. The analyzed technology (centrifugal casting) enables making elements with high surface quality with reduced consumption of batch materials and, as a result, reducing the costs of making a unitary casting. The idea behind the production of cast steel with the use of centrifugal technology was to find a remedy for the problems associated with unsatisfactory castability of the tested alloy. The technological evaluation of the cast construction was carried out using the Nova Flow & Solid CV 4.3r8 software. Numerical simulations of crystallization and cooling were carried out for a casting without a gating system and sinkhead located in a mold in accordance with the pouring position. It was assumed that the analyzed cast will be made in the sand form with dimensions 250×250×120 mm.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 4; 1449-1456
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Remelting on the Quality of Prosthetic Cobalt Alloys
    Autorzy:
    Nadolski, M.
    Łągiewka, M.
    Konopka, Z.
    Zyska, A.
    Golański, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/382647.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cobalt alloy
    centrifugal casting
    lost wax technology
    dental prosthetics
    stop kobaltu
    odlewanie odśrodkowe
    metoda wytapianych modeli
    protetyka stomatologiczna
    Opis:
    A commercial cobalt alloy applied in dental prosthetics was investigated. The scope of the work included the microstructure analysis, performance examination (tensile strength, microhardness, corrosion resistance), and dilatometric examination. The investigated alloy after a single remelting was characterised by higher tensile strength and hardness. There were not found the definite results with regard to the corrosion resistance of the examined materials. No significant change occurred in the coefficient of thermal expansion.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 3 spec.; 53-58
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analytical method for determining antropometric parameters in body mass reduction process in the aspect of health safety
    Analityczna metoda określania parametrów antropometrycznych w procesie redukcji masy ciała w aspekcie bezpieczeństwa zdrowia
    Autorzy:
    Ślęzak, A.
    Ślęzak-Prochazka, I.
    Batko, K. M.
    Zyska, A.
    Gawrys, W.
    Jóźwiak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/103598.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
    Tematy:
    overweight reduction
    mathematical model
    bioelectric impendance method
    overweight reduction coefficient
    low-sugar diet
    health security
    redukcja nadwagi
    model matematyczny
    metoda impedancji bioelektrycznej
    współczynniki redukcji nadwagi
    dieta niskocukrowa
    bezpieczeństwo zdrowotne
    Opis:
    In this study, for the first time we developed a mathematical model showing that the reduction in parameters such as total body mass, total fat mass, visceral fat mass, waist circumference, hip circumference and body mass index (BMI) can be described using exponential equations. Constants kt, kf, kfv, kBMI, kp, kb that occur in particular equations characterize individual features related to these anthropometric parameters. The presented model was verified using experimental data obtained by analysis of body composition. These individuals were overweight in the initial moment of the experiment and eliminated or limited easily digestible products containing sugar from their diet. We showed that there is a critical time, when each individual achieved normal values of body mass index, fat mass, visceral fat mass, waist circumference, hip circumference, and waist-hip ratio. This critical time ranged between 35 and 46 weeks.
    W tym badaniu jako pierwsi opracowaliśmy model matematyczny pokazujący, że zmniejszenie parametrów, takich jak całkowita masa ciała, całkowita masa tłuszczu, trzewna masa tłuszczowa, obwód talii, obwód bioder i wskaźnik masy ciała (BMI), można opisać za pomocą równania wykładniczego. Stałe kt, kf, kfv, kBMI, kp, kb występujące w poszczególnych równaniach charakteryzują poszczególne cechy związane z tymi parametrami antropometrycznymi. Przedstawiony model zweryfikowano za pomocą danych eksperymentalnych uzyskanych poprzez analizę składu ciała. Osoby badane miały nadwagę w początkowym momencie eksperymentu i wyeliminowały lub ograniczyły z diety łatwo przyswajalne produkty zawierające cukier. Pokazaliśmy krytyczny czas, kiedy każdy człowiek osiąga normalne wartości wskaźnika masy ciała, masy tłuszczu, masy trzewnej, obwodu talii, obwodu bioder i stosunku talii do bioder. Ten krytyczny czas waha się od 35 do 46 tygodni.
    Źródło:
    Prace Naukowe Akademii im. Jana Długosza w Częstochowie. Technika, Informatyka, Inżynieria Bezpieczeństwa; 2017, T. 5; 191-208
    2300-5343
    Pojawia się w:
    Prace Naukowe Akademii im. Jana Długosza w Częstochowie. Technika, Informatyka, Inżynieria Bezpieczeństwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena efektywności czynnego uodporniania ciężarnych macior wakcyną w profilaktyce kolibakteriozy prosiąt osesków z uwzględnieniem różnych dróg podawania preparatu
    Ocenka ehffektivnosti aktivnojj immunizacii suporosnykh svinomatok vakcinojj v profilaktike kolibakterioza sosushhikh porosjat, s uchetom raznykh sposobov podachi preparata
    Estimation of the efficiency of active immunization of farrow sows with vaccine in the prophylaxy of colibacteriosis of suckling piglets taking into consideration different drug administration ways
    Autorzy:
    Furowicz, A.
    Zyska, W.
    Loczewski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/798018.pdf
    Data publikacji:
    1990
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    lochy prosne
    wakcyna
    kolibakterioza
    prosieta
    preparaty
    trzoda chlewna
    hodowla
    antygeny
    pregnant sow
    vaccine
    colibacteriosis
    piglet
    preparation
    pig
    animal breeding
    antigen
    Opis:
    Целью настоящего труда была оценка эффективности 5 видов вакйин изготовляемых на базе местного энтеротоксичного серотина Е. coli (Мун 987) в борьбе с колибактериозом сосущим поросят. Вакцинации подвергали 3 группы супоросных свиноматок (по 10 голов), применяя инактивированные вакцины перорально и подкожно, а жизнеспособную вакцину перорально. Потомство указанных свиноматок заражали непосредственно после рождения штаммом Мун 1413, имеющим только один общий компонент со штаммом Мун 987 - фимбриальный антиген. Установлено, что иммунизация супоросных свиноматок вакцинами изготовленными на базе местных фимбриальных энтеротоксичных штаммов Е. coli хранит их потомсто против болезни. Она приводит также к лучшему росту поросят на 1-ой неделе жизни и позволяет сократить период предродовой акклиматизации супоросных свиноматок. Установлено, что наиболее эффективно действует вакцина содержащая живые бактерии подаваемая перорально и инактивированная вакцина подаваемая подкожно.
    The aim of the respective investigations was to assess the efficiency of 3 vaccine kinds produced on the basis of a local enterotoxic E. coli serotype (Moon 987) in the prophylaxy of colibacteriosis of suckling piglets. Three groups of farrow sows (by 10 heads) at administration of the inactivated vaccines per os and subcutaneously and the vital vaccine per os. The offsping of these sows was infected close after birth with the enterotoxin Moon 987 strain - fimbrial antigen. It has been found that the immunization of farrow sows with vaccines prepared on the basis of local, fimbrial enterotxic E. coli strains protects their offspring against the disease. It results also in a better growth of piglets in the 1st week of life and allows to shorten the prepartum acclimatization period of farrow sows. It has been found that the most efficient is the vaccine containing living bacteria administered per os and the inactivated vaccine administered subcutaneously.
    Źródło:
    Zeszyty Problemowe Postępów Nauk Rolniczych; 1990, 384
    0084-5477
    Pojawia się w:
    Zeszyty Problemowe Postępów Nauk Rolniczych
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-30 z 30

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