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Search Results: 1 - 10 of 958 matches for " Palija Tanja "
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The impact of the top coating on the mechanical properties of lacquered wood surfaces
Jai? Milan,Palija Tanja
Glasnik ?umarskog Fakulteta , 2012, DOI: 10.2298/gsf1206087j
Abstract: This paper investigates the impact of the top coating on the basic mechanical properties of a lacquered surface, including indentation hardness, scratch resistance and abrasion resistance. Three types of the top coating were used, including a 2K polyurethane coating, a 2K acrylate-isocyanate coating and a 2K alkyd-urethane coating. Samples of two wood species, spruce (Picea abies Karst.) and oak (Quercus robur L.), were used in this study, in order to determine whether the wood species, which is not in direct contact with the top coating, has an impact on the mechanical properties of a lacquered surface. The samples coated with a 2K acrylate-isocyanate coating showed the highest values of indentation hardness, in the samples of both wood species (1.34 N for spruce; 1.4 N for oak). The samples coated with a 2K alkyd-urethane coating showed the highest values of scratch resistance (20 N for both wood species) and abrasion resistance (mass loss of 480 mg after 700 cycles for both wood species). The results have shown that the wood species does not affect the value of indentation hardness, scratch resistance and abrasion resistance of a lacquered surface.
Effect of bending pattern on finger joint bending strength
D?in?i? Igor,Palija Tanja,Pavlovi? Dragan
Glasnik ?umarskog Fakulteta , 2012, DOI: 10.2298/gsf1205073d
Abstract: Limited information is available on end gluing hardwoods in contrast to softwoods, which have been extensively investigated. The objective of this study was to examine the influence of bending patern on bending strength of finger jointed beech wood. In structural uses finger jointing is finally the major method to end joint timber for the production of glue-laminated elements. There are no bending strength experimental results for finger-jointed hardwoods for investigations conducted in Serbia. Two finger jointed profiles were studied in accordance with DIN68140. The finger joints were made by side and by face of beam. Length jointed samples were loaded at the side and in the face. The obtained results led to the conclusion that the direction of load, gluing surface and the position of joint influence on the strength of continued longitudinal beams.
The influence of surface finishing of Paulownia Siebold et Zucc. on the mechanical properties of lacquered surface
Jai? Milan,Dobi? Jovan,Palija Tanja
Glasnik ?umarskog Fakulteta , 2010, DOI: 10.2298/gsf1002007j
Abstract: This paper presents the research of influence of sanding, staining and the use of polyurethane and acrylic coating on the adhesion, scratch resistance and abrasion resistance of the coating. Objective was to determine the most important mechanical properties of lacquered surfaces, considering the application of Paulownia elongata and Paulownia fortunei, by using different systems of surface finishing. Cross cut method was used for measurement of adhesion. More accurate view of coating adhesion was obtained by measuring the scratch resistance. Abrasion resistance was tested by the method of free falling of abrasive particles. The applied system of sanding had no effect on the examined mechanical properties. Stained samples lacquered with PU coating showed better adhesion to the non-stained samples. Impact of staining on scratch resistance is not established. Stained samples showed greater resistance to abrasion for both wood species. Samples lacquered with PU coating showed the higher values of mechanical properties compared with samples lacquered with UV acrylic coating. Application of PU coating for surface finishing of Paulownia elongata and Paulownia fortunei is more adequate than the application of UV acrylic coatings, from the point of scratch resistance and abrasion resistance.
The influence of sanding system on wetting of Paulownia siebold et zucc.
Jai? Milan,Palija Tanja,Dobi? Jovan
Glasnik ?umarskog Fakulteta , 2010, DOI: 10.2298/gsf1001067j
Abstract: This paper presents the research of influence of wood surface preparation on the wetting ability of polyurethane coatings, by the method of contact angle. The samples were made of two species of Paulownia (Paulownia elongata and Paulownia fortunei). All the samples were processed by planing (molding). After molding, the samples were arranged in groups and sanded. In relation with wood grain direction, each group had a particular system of sanding, based on the numbering of sanding paper, program of displacement of sanding papers with different numbering and the direction of sanding. The quality of wood surface after sanding was expressed by the values of roughness parameters in the system 'M': Ra, Rz, Rv, Rp and Rt. The contact angle was measured using transparent polyurethane (PU) coating and distilled water. The influence of the system of sanding on the values of contact angle was analyzed by roughness parameter Ra.
Influence of different joints on quality of dining chairs
Skaki? Du?an,D?in?i? Igor,Nestorovi? Biserka,Palija Tanja
Glasnik ?umarskog Fakulteta , 2008, DOI: 10.2298/gsf0897235s
Abstract: Products quality presents one of the main causes of every contemporary organized production, which includes it, in group of basic exit characteristics. According to national standard, quality mark is based on testing of its quality characteristics. A characteristic of quality has been divided into four groups of demands: functionality (functional dimensions and stability tests), rigidity, surface rigidity, quality of materials and work piece accuracy. Dining chair has been investigated by use of different wood joints, and some remarks on construction has been given. Two groups of investigated chairs has been mounted by use of metal fittings, and one group has been connected with wood dowels by use of PVA wood glue.
Teaching PCA through Letter Recognition  [PDF]
Tanja Van Hecke
Creative Education (CE) , 2011, DOI: 10.4236/ce.2011.23040
Abstract: This article presents the use of a real life problem to reach a deeper understanding among students of the benefits of principal components analysis. Pattern recognition applied on the 26 letters of the alphabet is a recognizable topic for the students. Moreover it is still verifiable with computer algebra software. By means of well defined exercises the student can be guided in an active way through the learning process.
Influence of Random Pinning on the Crystallization Process in Suspensions of Hard Spheres  [PDF]
Sven Dorosz, Tanja Schilling
Journal of Crystallization Process and Technology (JCPT) , 2014, DOI: 10.4236/jcpt.2014.42012
Abstract: We discuss crystal formation in supersaturated suspensions of monodisperse hard spheres with a concentration of hard spheres randomly pinned in space and time. The pinning procedure introduces an external length scale and an external time scale that restrict the accessible number of configureurations and ultimately the number of pathways leading to crystallization. We observe a significant drop in the nucleation rate density at a characteristic pinning concentration that can be directly related to the structure of the critical nucleus and the dynamics of its formation in the unpinned system.
Appendix 3: Summary of the Evaluation of the Seminar The Effective Library”
Tanja Notten
Liber Quarterly : The Journal of European Research Libraries , 2002,
Abstract:
Steuergruppen von Schulnetzwerken: Gestaltungsm glichkeiten durch Distinktionen in Erweiterungsprozessen Steering Committee Members in School Networks: Distinctions in Admission Processes Miembros del Comité Directivo en las redes escolares: Distinciones en los procesos de admisión
Tanja Sturm
Forum : Qualitative Social Research , 2010,
Abstract: Netzwerke, in denen Personen kooperieren, um im Schulsystem nachhaltige Schul- und Professionalit tsentwicklung zu initiieren und zu etablieren, werden seit Ende der 1990er Jahre zunehmend aufgebaut. Netzwerke sind meist interessiert, sich auszuweiten, um m glichst viele Lehrende in Innovationen einzubeziehen. Steuergruppen stellen das operative Zentrum von Netzwerken dar. Sie übernehmen die Koordination und Organisation der Schulentwicklungsinitiativen eines Netzwerks und dienen als solche u.a. als Schnittstelle zwischen den bereits kooperierenden und potenziell neuen Mitgliedern. Bislang gibt es jedoch kaum Erkenntnisse darüber, wie die Steuergruppenmitglieder diesen Vermittlungsprozess gestalten und woran sie sich dabei orientieren. In diesem Beitrag soll an diesem Forschungsdesiderat angesetzt werden, indem die von Steuergruppenmitgliedern formulierten Zugangsm glichkeiten zum Netzwerk untersucht werden, die im Rahmen einer qualitativ angelegten Studie mithilfe problemzentrierter Interviews erhoben wurden. Die Befragungen wurden im Winter 2007/8 im Rahmen der sterreichischen Regionalen Netzwerke, einer von vier Ma nahmen eines landesweiten Projekts zur St rkung des mathematisch-naturwissenschaftlichen Unterrichts, durchgeführt. Drei unterschiedlich ausgestaltete Vermittlungsprozesse, die sich im Spannungsfeld von Sach- und Schulstrukturorientierung einerseits und den Vorstellungen zu inhaltlichen Gemeinsamkeiten und Unterschieden innerhalb des Netzwerks andererseits bewegen, konnten aus den Interviews generiert werden. Die drei rekonstruierten Typen von Zugangsm glichkeiten – sachlich-homogen, sachlich-heterogen und bürokratisch-homogen – die durch sogenannte Distinktionen, d.h. habituell vorgenommene Bewertungsformen, realisiert werden, werden anhand von Fallbeispielen illustriert und miteinander kontrastiert. Auf der Grundlage der Ergebnisse werden (Forschungs-) Perspektiven für den Einsatz des Entwicklungsansatzes der Schulnetzwerke formuliert. URN: urn:nbn:de:0114-fqs1003234 School networks—defined as people cooperating in order to initiate and emphasize school and professional development—have been established in German speaking areas since the beginning of the 1990s. One of their common goals is to raise the number of their active members. This purpose is connected to the idea of incorporating as many teachers as possible into possible innovations of the network. Steering committees are the operation centers of these kinds of school networks. They coordinate and organize the school and professional development initiatives of a network. Therefo
Music libraries and collections in Slovenia and abroad: characteristics and development trends
Tanja Curhalek
Knji?nica : Revija za Podro?je Bibliotekarstva in Informacijske Znanosti , 2003,
Abstract: Music libraries and collections with their materials, equipment and activities differ from general libraries, which mostly contain book materials. Library users are searching daily for more non-book music materials, specific for music libraries and collections, therefore detailed research on the situation and organization of such libraries and collections should be made. A detailed research was carried out on comprehensive Slovenian music libraries and collections. Consequently, a view was obtained of the situation of music librarianship in Slovenia, using a questionnaire and by communicating with librarians of the Music Collection of the National and University Library in Ljubljana, the Library of Department of Musicology at the Faculty of Arts in Ljubljana and the Library of the Academy of Music in Ljubljana, during the years 2000 and 2002. The research showed that music librarianship is not developed enough and that the Slovene public knows little about it, while in foreign countries libraries are contemporarily developed, well organized and extended, forming professional associations.
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