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    Wyświetlanie 1-9 z 9
    Tytuł:
    Barrier Properties of Coated and Laminated Polyolefin Films for Food Packaging
    Autorzy:
    Lazić, V.
    Budinski-Simendić, J.
    Gvozdenović, J.
    Simendić, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1538171.pdf
    Data publikacji:
    2010-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.35.Lr
    66.30.Pa
    82.80.Bg
    68.60.-p
    Opis:
    The food packaging industry demands polymer films possessing a defined barrier against permeation of gases, moisture and flavor. The objective of this study was to assess the differences between the barrier properties of coated and un-coated polyolefine films. Eight types of packaging films are prepared by standard industrial procedure by cast film extrusion processing with chill rollers: biaxially oriented polypropylene (BOPP), BOPP coated by acrylic copolymer, metallized BOPP by aluminum, and low-density polyethylene (LDPE). The influence of lamination and metallization on the gas molecules ($CO_{2}$, $O_{2}$ and $N_{2}$) was determined by Lyssy's method. The moisture transparency was assessed according to the gravimetric method. The substantial differences between the barrier properties of the coated and un-coated films were estimated. It was estimated that the lamination process improves the oxygen barrier but not necessarily the moisture barrier, due to the different mechanisms for oxygen and moisture permeability. The obtained barrier properties data were considered from a practical point of view. It was concluded that films based on metallized BOPP has excellent barrier properties and can be used to over wrap food products.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 5; 855-858
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of welding time on quality of the friction welded joint of two dissimilar steels
    Autorzy:
    Ratković, N.
    Lazić, V.
    Arsić, D.
    Nikolić, R.
    Hadzima, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/114836.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    friction welding
    joint quality
    welding time
    friction time
    compacting time
    spawanie tarciowe
    jakość połączenia
    czas spawania
    czas tarcia
    Opis:
    There are several factors that influence the friction welding (FW) process, i.e. the quality of the welded joint, like the welding time, the contact pressure, the compacting pressure, the friction speed etc. The joining process is additionally complicated if the two different materials are to be welded to each other. The subject of research, presented in this paper, is the welding time of the FW process, since the level of axial and radial plastic deformation of the welded pieces and shortening of the welded part depend mainly on the welding time. The paper first presents some theoretical basics of the FW process and then, in the experimental part, the influence of the process duration is investigated. The two materials that the experimental samples were made of are the high-speed steel and the steel for tempering.
    Źródło:
    Zeszyty Naukowe. Quality. Production. Improvement; 2017, 1 (6); 1-11
    2544-2813
    Pojawia się w:
    Zeszyty Naukowe. Quality. Production. Improvement
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Revitalization of the damaged machine parts by hard facing as a way of saving funds
    Autorzy:
    Lazic, V.
    Arsic, D.
    Nikolic, R.
    Mutavzic, M.
    Hadzima, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/111734.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    revitalization technology
    hard facing
    costs
    savings
    profitability
    loader's bucket teeth
    technologia rewitalizacji
    napawanie
    rentowność
    ładowarka
    Opis:
    The objective of the research, presented in this paper, was to demonstrate the superiority of the hard facing as the revitalization technology of various damaged machine parts. The analysis of the two different revitalization methods of the damaged machine parts is presented – the replacement of the damaged part by the new – spare part and reparation by hard facing. The comparison is done on the example of hard facing and replacing of damaged loader's teeth. The paper presents a method for calculating costs of the two revitalization technologies based on their profitability and their comparison. That method could be applied for similar calculations for any machine part, with smallest or no adjustments. The paper presents a verification of advantage of applying the hard facing as the machine parts reparatory technology with respect to the other revitalization technology. The savings realized by application of hard facing reparation of the loader's teeth reach 73.5 % for one set of teeth and 82.40per annum of the costs for purchasing the new spare parts. The analysis was conducted under an assumption that organization of the maintenance function is at the exceptionally high level so that the purchasing of the new part/repairing of the damaged one is always done in time. This idealized approach was adopted since in that way one obtains the least economic effects of the reparatory technology application with respect to replacing the part with the spare one. In any other case the economic effects would be significantly higher, namely even more positive in favor of the hard facing revitalization technology.
    Źródło:
    Production Engineering Archives; 2016, 12, 3; 9-13
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Correlations of Mechanical Properties and Microstructure at Specific Zones of Welded Joint of High-Strength Low-Alloy Steels
    Autorzy:
    Ivanović, L.
    Marjanović, V.
    Ilić, A.
    Stojanović, B.
    Lazić, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/354032.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high-strength low-alloy steel
    welded joint
    mechanical properties
    microstructure
    Opis:
    This paper presents experimental testing of the mechanical characteristics and properties of samples made of high-strength low-alloy steel with two different multi pass V grove butt welded joint. Two sample groups are tested: the root pass is made by manual metal arc welding process for the former and metal inert gas welding process for the latter. Other passes of those multi passes welded joints are made by metal active gas welding process. Further, the research included analyses of the experimentally obtained mechanical properties and load response of the samples in correlations to microhardness distribution and microstructural state at specific zones of the welded joints. Since both the chemical composition and microstructural state of high-strength low-alloy steel originate from special production processes their nature must be fully understood. Accordingly, the nature of the steels should directly impact not only the selection and definition of welding but the design process of mechanical constructions, too. From the practical aspect, mechanical characteristics and properties as well as load response of welded joints are crucial. But, sensitivity of those steels to inadequate welding technology and improper parameters or filler metal is high. On the other side, design codes and recommendations are not yet fully developed and precise. Results obtained in this research implicate that even small changes of welding technology causes the change of characteristics itself. Consequently, the steels development must be accompanied with the improvement of the welding processes and design modifications.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 1; 285-292
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Review of the Hard-Facing Technology Application for Reparation of the Given Parts in Various Branches of Industry
    Autorzy:
    Lazić, V.
    Arsić, D.
    Mutavdžić, M.
    Nikolić, R.
    Meško, J.
    Radović, L.
    Ilić, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/2064968.pdf
    Data publikacji:
    2018
    Wydawca:
    STE GROUP
    Tematy:
    regeneration
    hard-facing
    friction
    wear
    machine parts
    Opis:
    This paper deals with the problem of defining the optimal procedure for reparation of the machine parts of large dimensions and complex shapes. The procedure consists of establishing the causes of the part's damages, definition of the reparation technology, with selection of its parameters and ways of execution. The reparation is done by hard-facing, with heat treatment that consists of preheating, additional heating and the post hard-facing tempering. The process parameters' selection includes choosing the right filler metal(s), ways and order of depositing the hard-faced layers, ways of reaching and maintaining the preheating temperatures, checking of the base metal's chemical composition and mechanical properties and deciding on the post-process heat and mechanical processing of the executed hard-facing. The executed reparation of the forging hammer's mallet, presented in details, serves as an example how the reparation can successfully serve as a substitute for procuring the new part and thus producing the savings both directly in lower costs and indirectly in shortening the down-time of the damaged part operation.
    Źródło:
    Multidisciplinary Aspects of Production Engineering; 2018, 1, 1; 279--285
    2545-2827
    Pojawia się w:
    Multidisciplinary Aspects of Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reparation of damaged forging dies by hard facing (HF) technology
    Autorzy:
    Lazic, V.
    Arsic, D.
    Nikolic, R. R.
    Aleksandrovic, S.
    Milosavljevic, D.
    Djordjevic, M.
    Cukic, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/111606.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    forging dies
    hard facing (HF)
    filler metals (FM)
    hardness
    microstructure
    matryce kuźnicze
    napawanie
    spoiwa
    twardość
    mikrostruktura
    Opis:
    The forging dies are in exploitation exposed to elevated temperatures and variable impact loads, both compressive and shear. Steels for manufacturing of these tools must endure those loads while maintaining mechanical properties and being resistant to wear and thermal fatigue. For those reasons, the alloyed steels are used for making the forging dies, though they have less weldability, because alloying increases proneness to hardening. Any reparatory hard facing (HF) of the damaged dies would require the specially adjusted technology to the particular piece. In this paper reparatory hard facing of dies used for forging pieces in the automobile industry is considered. Prior to reparatory hard facing of the real tools, numerous experimental hard facings on models were performed. All the model hard facings were done on the same steels which were used for production of the real forging dies. To define the optimal hard facing technology one needs to derive the optimal combination of the adequate heat treatment(s), to select the proper filler metals and the welding procedure. The established optimal HF technology was applied to real forging dies whose service life was further monitored in conditions of exploitation.
    Źródło:
    Production Engineering Archives; 2015, 6, 1; 26-29
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polymer - Bonded Magnetic Materials with Various Nd-Fe-B Filler Content
    Autorzy:
    Grujić, A.
    Lazić, N.
    Talijan, N.
    Spasojević, V.
    Stajić-Trošić, J.
    Ćosović, V.
    Aleksić, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1538172.pdf
    Data publikacji:
    2010-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Ww
    81.05.Qk
    83.85.Vb
    46.35.+z
    81.70.Pg
    91.60.Pn
    68.37.Hk
    Opis:
    One of the more important developments in magnetic materials, polymer bonded magnets, have opened a new world of application opportunities. The Nd-Fe-B/polymer composite materials offer an excellent combination of strong magnetic and dynamical-mechanical properties. However, the transition temperatures of filler and matrix should be selected carefully considering the future application. Uniform particle distribution and good adhesion between Nd-Fe-B powder particles and polymer are essential for the quality of the composite, while stiffness of polymer matrix is one of the influencing factors as well. The damping properties of Nd-Fe-B/polymer composites with 15 wt.%, 50 wt.% and 75 wt.% of Nd-Fe-B powder were studied by dynamic mechanical analysis and compared with a pure polymer sample. Thermal stability was analyzed using a simultaneous differential scanning calorimetric and thermogravimetric analysis technique.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 5; 859-863
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Choice of optimal biocide combination to control flies (Diptera: Muscidae)
    Autorzy:
    Kavran, M.
    Zgomba, M.F.
    Ignjatovic-Cupina, A.M.
    Lazic, S.D.
    Petric, D.V.
    Powiązania:
    https://bibliotekanauki.pl/articles/50023.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Medycyny Wsi
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2015, 22, 2
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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