30 research outputs found
Review and analyses of sheet metal forming processes with media
No full textDandanes so vse večje zahteve po proizvodnji lažjih in okolju prijaznejših izdelkov. Te zahteve silijo predvsem avtomobilsko in letalsko industrijo k razvoju novih preoblikovalnih postopkov. Znanih je kar veliko preoblikovalnih postopkov pločevine, vendar vsi ne zadostijo naštetim zahtevam. Z vlaganjem v razvoj in s posodabljanjem že obstoječih postopkov je prišlo do množične uporabe preoblikovanih postopkov, ki temeljijo na preoblikovanju z uporabo medija. Za medij se lahko uporabijo plin, tekočina, trdi delci ali pa fleksibilno orodje. Z uporabo teh postopkov se drastično zmanjšajo stroški izdelave orodij za preoblikovanje. Kakovost preoblikovanih površin se pa izboljša. To sta tudi glavni prednosti postopkov preoblikovanja z medijem. V tem delu bodo predstavljeni postopki, ki temeljijo na preoblikovanju z uporabo medija. Največji poudarek bo na postopku Hydroformng, saj se v praksi največ uporablja. Omenjen bo tudi postopek globokega vleka z medijem. Predstavljeni bodo tudi novejši postopki, kot je inkrementalno preoblikovanje z vodnim curkom, VPF postopek itd. Opisani bodo tudi stroji in orodja, ki se uporabljajo pri preoblikovanju z medijem. Za vsak postopek bodo podani tudi primeri preoblikovanja iz prakse.Requirements for nowadays products are that they are cheaper, lighter and environmental friendly. These requirements are forcing especially industry of aircraft and automobile in develop of new sheet metal forming processes. There are many processes of sheet metal forming but some don\u27t meet these requirements. From development of conventional forming processes, have appeared new forming processes which based on forming with media. As a media, for sheet metal forming can be used flexible tool, liquid, gas etc. The main advantages of sheet metal forming process with media is reducing tool costs and increasing quality of formed parts. Processes which based on forming with media are described in this work. The main emphasis will be on Hydroforming process which is widely used in practice. It will also mention the deep drawing with media, incremental sheet metal forming, VPF etc. Machines and tools for sheet metal forming processes with media will also described in this work. On practical examples of forming parts will be introduced every processes
Development of inter-territorial cooperation of municipalities presented on the case of Medvode and Crest municipality
No full textObčine izvajajo naloge na omejenem območju, a zaradi različnih razlogov sodelujejo z drugimi občinami, tako s sosednjimi kot oddaljenimi, in to znotraj iste države ali v drugi državi. Občine sicer delujejo znotraj različnih nacionalnih upravnih sistemov, vendar se srečujejo s podobnimi težavami in imajo podobne interese – sodelovanje tako ponuja nove priložnosti za razvoj na različnih področjih.
Mednarodno sodelovanje samoupravnih lokalnih skupnosti ima v Evropi dolgo tradicijo. Slovenske občine so začele intenzivneje sodelovati s tujimi že pred vstopom v Evropsko unijo, nato se je sodelovanje še okrepilo. Raziskovanje medobmočnega sodelovanja občin Medvode in Crest je predmet tega dela, ker to področje še ni bilo raziskano. Cilja diplomskega dela sta analiza pravne ureditve medobčinskega sodelovanja s poudarkom na medobmočnem sodelovanju in študija konkretnega primera, ki ugotovi obseg in intenzivnost sodelovanja.
Na podlagi izvedene raziskave je ugotovljeno, da ima sodelovanje občin Medvode in Crest dolgoletno tradicijo. Občini najbolj sodelujeta na področju kulture, na drugem mestu je šport, sledita izobraževanje in mladi ter na zadnjem mestu turizem. Trenutno sodelovanje med občinama ne narašča, kar je mogoče pripisati epidemiji koronavirusa. Glavni problem pri sodelovanju Občine Medvode in Občine Crest je zahtevna priprava projektne dokumentacije, ki je pomembna pri sodelovanju oz. vodenju projektov, podprtih s strani Evropske unije. Občini sta naklonjeni nadaljevanju uspešnega sodelovanja, ki ga podpirajo tudi občani Občine Medvode. Na podlagi teh ugotovitev se nadaljnje raziskovanje lahko usmeri v različne smeri, npr. v analizo vzrokov za izbor posamezne oblike sodelovanja in dejavnikov uspešnosti posameznih oblik sodelovanja.Municipalities carry out their tasks in a limited area, but for various reasons they cooperate with other municipalities, both neighbouring and/or distant, within the same country or in other countries. Although they operate within different national administrative systems, municipalities face similar problems and have similar interests - cooperation amongst them offers new opportunities for development in different areas.
International cooperation between local authorities has a long tradition in Europe. Slovenian municipalities started to cooperate more intensively with foreign ones already before EU accession, and since then cooperation has intensified. We started to explore inter-territorial cooperation between the municipalities of Medvode and Crest because this area hadn’t been explored before. The objectives of the thesis were to analyse the legal regulation of inter-municipal cooperation, with a focus on inter-territorial cooperation, and to carry out a case study to determine the extent and intensity of cooperation.
Based on the research carried out, we conclude that the cooperation between the municipalities of Medvode and Crest has long tradition. The two municipalities cooperate most in the field of culture, followed by sport, education, youth and finally tourism. At present, cooperation between the two municipalities is not increasing, which can be attributed to the coronavirus epidemic. The main problem in the cooperation between the Municipality of Medvode and the Municipality of Crest is a complex preparation of project documentation, which is important for the cooperation or management of EU-supported projects. The two municipalities are keen to continue their successful cooperation, which is also supported by the citizens of the Municipality of Medvode. Based on this findings, further research can be directed in different directions, for example the analysis of the reasons for the choice of the particular form of cooperation and the success factors of different forms of cooperation
THE RESTRUCTURING OF INDUSTRIAL ACTIVITIES IN SLOVENSKA BISTRICA
No full textV diplomskem delu z naslovom Prestrukturiranje industrijskih dejavnosti v občini Slovenska Bistrica so analizirane gospodarske spremembe občine po letu 1991. Delo obravnava razvoj bistriškega gospodarstva, prestrukturiranje industrijskih dejavnosti in vplive prestrukturiranja na demografsko podobo občine. Prav tako je namen naloge predstaviti proces tranzicije Slovenije, strukturne spremembe nastale po osamosvojitvi in preskok v gospodarskem napredku po vključitvi v skupni evropski prostor. Prehod v tržno gospodarstvo je razkril strukturna neskladja gospodarstva, ki se je moralo spopasti z novimi pogoji tržnega poslovanja. Ta proces Slovenske Bistrice ni povsem obšel, a gospodarstvo občine vseskozi temelji na kovinsko predelovalni industriji, ki so jo podjetja uspela prilagajati zahtevnim razmeram na trgu. S prestrukturiranjem dejavnosti Slovenska Bistrica stopa v postindustrijsko obdobje. Povečuje se pomen storitev, a je mesto z okolico še vedno izrazito usmerjeno v industrijo, natančneje v predelavo kovinskih izdelkov. V Slovenski Bistrici, kljub splošnemu zatonu industrije, število delovnih mest v sekundarnem sektorju narašča. Vendar gre tukaj za spremenjeno obliko industrije, bolj fleksibilno in tehnološko intenzivnejšo, z velikimi vlaganji v raziskave in razvoj. Storitveni sektor se uveljavlja predvsem v številu poslovnih subjektov. Prevladujejo manjša zasebna podjetja, ki razvijajo nove dejavnosti z visoko dodano vrednostjo. Nove gospodarske razmere vplivajo na mobilnost prebivalstva, kar vpliva na povečanje števila dnevnih migrantov. Spremembe ekonomskih aktivnosti se v prostoru odražajo v spremenjeni prostorski in funkcijski zgradbi mesta. Za obrobje mesta je značilen trend gradnje nakupovalnih središč ter izgradnje industrijskih objektov v dobro opremljeni industrijsko obrtni coni.In the thesis called Restructuring of industrial activities in the municipality of Slovenska Bistrica we analyzed economic changes in the municipality since 1991. The work discusses the development of the economy of Slovenska Bistrica, the restructuring of industrial activities and the effects of restructuring on the demographic picture of the municipality. The purpose of the thesis is also to present the Slovenian transition process, structural changes, which occurred after the independence and the shift in economic progress after we joined the common European space. The transition to a market economy has revealed the structural imbalances of the economy, which had to cope with new conditions of market operations. This process did not entirely circumvent Slovenska Bistrica, but the municipality’s economy is all the time based on the metal processing industry, which companies were able to adapt to the demanding market conditions. With the restructuring of industrial activities Slovenska Bistrica enters the post-industrial period. The importance of services is increasing, but the city and its surroundings are still highly focused on industry, specifically in the processing of metal products. The number of jobs in the secondary sector in Slovenska Bistrica is growing, despite the general industrial downfall. However, in this case we are talking about a modified form of industry, more flexible and technology-intensive with large investments in research and development.
The service sector is asserting itself primarily in the number of business entities. Small private companies which develop new activities with high added value are predominated. New economic conditions affect the mobility of the population, which affects the increase in the number of commuters. Changes of economic activities reflected in the space as an altered spatial and functional structure of the city. For the outskirts the trend of building shopping centers and construction of industrial facilities in a well equipped industrial trade zone is typical
UPDATE OF LUBRICATION SYSTEM ON ROLLING MILL FRAMEWORK
No full textNa valjarni za valjanje aluminijske folije je prihajalo do mešanja valjčnega in ležajnega olja. Pri tem so nastajali zelo veliki stroški zaradi zamenjave valjčnega olja. Zato se je začela izgradnja novega mazalnega sistema za mazanje ležajev delovnih valjev. Uporabila se je tehnologija mazanja olje-zrak.
V diplomskem delu so predstavljeni elementi, ki sestavljajo takšen sistem. Predstavljena je celotna sprememba mazalnega sistema in ekonomska upravičenost projekta.Mixing of rolling mill lube and bearing oil was occurring on rolling mill for rolling of aluminum foil. In this case, generated very high costs of replacement rolling mill lube oil. Thus began the construction of new lubrication systems for lubricating bearings working cylinders. The oil-air lubrication technology is used.
In this diploma work are introduced elements which assemble such system. It presents the overall change in the lubricating system and the economic viability of the project
Multivalent binding and selectivity in cell targeting, molecular recognition and receptor activation
No full textMULTIVALENT BINDING AND SELECTIVITY IN CELL TARGETING, MOLECULAR RECOGNITION AND RECEPTOR ACTIVATION
Jure Dobnikar, Institute of Physics, Chinese Academy of Sciences, Beijing, Chin ; Department of Chemistry, University of Cambridge, UK ; School of physical sciences, University of Chinese Academy of Sciences
One of the key challenges in nano-science is to design nanoparticles that can recognize and target specific objects. One such example are ligand-coated nanoparticles binding to surfaces covered with receptors forming bonds with the ligands. The requirement of many applications is that the particles bind selectively to surfaces with receptors either above a threshold concentration or in a specific geometric arrangement. Such nanoparticles would enable precise functioning of nano machines, as well as selective targeting of cells in drug delivery. Similarly, many biological processes rely on chemical activation based on (macro-) molecular recognition. Also in this case, the receptors need to selectively bind to specific molecules to get activated. In recent years, it has been shown that super-selectivity can only be achieved with multiple weak reversible bonds where many ligands simultaneously bind to the surface receptors. Only in such systems, the fraction of bound particles varies sharply with the receptor concentration and nano-particles can be designed such that they approach the on-off binding behaviour required for super- selective targeting. I will report on our recent work on physics of multivalent binding and specifically address targeting cancer cells, molecular recognition and multivalent receptor activation by DNA-peptide complexes in the immune system.
Publications:
[1] N.W. Schmidt, F. Jin, R. Lande, T. Curk, W. Xian, L. Frasca, D. Frenkel, J. Dobnikar, M. Gilliet, G.C.L. Wong, Antimicrobial-peptide-DNA complexes amplify TLR9 activation via liquid-crystalline ordering, Nature Materials 14, 696 (2015)
[2] T. Curk, J. Dobnikar, D. Frenkel, Rational design of molecularly imprinted polymers, Soft Matter 12, 35 (2016)
[3] T. Curk, J. Dobnikar, and D. Frenkel, Optimal multivalent targeting of mem- branes with many distinct receptors, to appear in PNAS (2017
The origin of plagioclase-mantled k-feldspar in porphyry rocks of Karavanke granitic massif (Slovenia)
No full textPetrography and mineral chemistry of hybrid rocks from Triassic Karavanke granitic massif.
No full text
