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Comparison of specific energies for cutting, drilling and sawing Plano dimension stones : master's thesis
No full textZa eksploataciju mineralnih sirovina koriste se razni procesi razrušavanja stijene među koje spadaju rezanje, bušenje i piljenje. Sva tri procesa se javljaju u nekom obliku u kamenolomima arhitektonsko – građevnog kamena, gdje se primarni blokovi dobivaju kombinacijom lančane sjekačice, hidraulične rotacijske bušilice i dijamantne žične pile. Navedeni strojevi imaju različite radne veličine ali im je mehanika razrušavanja stijene gotova ista, pa je temeljem toga postavljena hipoteza kako su i specifične energije rezanja, bušenja i piljenja iste, jedina razlike je u putanji reznog elementa. U literaturi su pronađeni znanstveni radovi i doktorske disertacije u kojima su izvedena ispitivanja u kojima su se odredile specifične energije rezanja, bušenja i piljenja ali nije pronađen nijedan rad koji pokušava usporediti specifične energije sva tri procesa. U disertaciji Antoljak (2019) provedeno je terensko ispitivanje na kamenolomu Redi pored mjesta Plano u kojem su uz fizikalno-mehanička svojstva stijenskih uzoraka dobiveni i iznosi specifičnih energija rezanja i bušenja u ovisnosti o CERCHAR indeksu abrazivnosti. U znanstvenom radu Bagherpour i dr. (2020) izvedeno je ispitivanje specifične energije piljenja te je dobivena relacija u kojoj je abrazivnost izražena preko Schimazekovog faktora abrazivnosti. U literaturi su pronađena ispitivanja u kojima se iskazuju ovisnost CERCHAR i Schimazekovog faktora abrazivnosti, pomoću tih radova iznosi svih triju specifičnih energija se mogu izraziti preko Schimazekovog faktora abrazivnosti, preko tih relacija i podataka o svojstvima stijenskih uzoraka sa kamenoloma Redi iznosi za sve tri specifične energije se mogu uspoređivati.In order to excavate mineral resources some sort of rock disintegration process has to be utilized, for example cutting, drilling or sawing. All three of the processes are present in some way, shape, or form in a dimension stone quarry, where the primary blocks are obtained through the usage of chainsaws, hydraulic rotary drills and diamond wire saws. These machines have vastly different work parameters, but the way they operate on a basic level is similar, so based on that a hypothesis can be made that the specific energies of cutting, drilling, and sawing are also similar, the only difference being in the trajectories of the cutting element. Scientific papers, in which the specific energies of cutting, drilling and sawing were individually being experimented on, were observed but no scientific paper was found where an author tried to compare all three of these specific energies at once. In a doctoral thesis by Antoljak (2019.) extensive laboratory tests and field measurements were carried out at a dimension stone quarry Redi near Plano, the result of which was data about the physical and mechanical properties of rock samples from the same quarry along with equations describing the relation between cutting and drilling specific energies as a function of CERCHAR factor of abrasivity. In a scientific paper by Bagherpour and others (2020) similar laboratory tests were carried out and the result was an equation that describes the relation between specific energy for sawing with various rock characteristics including Schimazek's factor of abrasivity. Papers made by other various authors which detail the relation between CERCHAR and Schimazek’s factors of abrasivity were observed. All three specific energies were expressed as a function of Schimazek's factor of abrasivity and together with the field data from Redi quarry can be further compared
Comparison of specific energies for cutting, drilling and sawing Plano dimension stones : master's thesis
No full textZa eksploataciju mineralnih sirovina koriste se razni procesi razrušavanja stijene među koje spadaju rezanje, bušenje i piljenje. Sva tri procesa se javljaju u nekom obliku u kamenolomima arhitektonsko – građevnog kamena, gdje se primarni blokovi dobivaju kombinacijom lančane sjekačice, hidraulične rotacijske bušilice i dijamantne žične pile. Navedeni strojevi imaju različite radne veličine ali im je mehanika razrušavanja stijene gotova ista, pa je temeljem toga postavljena hipoteza kako su i specifične energije rezanja, bušenja i piljenja iste, jedina razlike je u putanji reznog elementa. U literaturi su pronađeni znanstveni radovi i doktorske disertacije u kojima su izvedena ispitivanja u kojima su se odredile specifične energije rezanja, bušenja i piljenja ali nije pronađen nijedan rad koji pokušava usporediti specifične energije sva tri procesa. U disertaciji Antoljak (2019) provedeno je terensko ispitivanje na kamenolomu Redi pored mjesta Plano u kojem su uz fizikalno-mehanička svojstva stijenskih uzoraka dobiveni i iznosi specifičnih energija rezanja i bušenja u ovisnosti o CERCHAR indeksu abrazivnosti. U znanstvenom radu Bagherpour i dr. (2020) izvedeno je ispitivanje specifične energije piljenja te je dobivena relacija u kojoj je abrazivnost izražena preko Schimazekovog faktora abrazivnosti. U literaturi su pronađena ispitivanja u kojima se iskazuju ovisnost CERCHAR i Schimazekovog faktora abrazivnosti, pomoću tih radova iznosi svih triju specifičnih energija se mogu izraziti preko Schimazekovog faktora abrazivnosti, preko tih relacija i podataka o svojstvima stijenskih uzoraka sa kamenoloma Redi iznosi za sve tri specifične energije se mogu uspoređivati.In order to excavate mineral resources some sort of rock disintegration process has to be utilized, for example cutting, drilling or sawing. All three of the processes are present in some way, shape, or form in a dimension stone quarry, where the primary blocks are obtained through the usage of chainsaws, hydraulic rotary drills and diamond wire saws. These machines have vastly different work parameters, but the way they operate on a basic level is similar, so based on that a hypothesis can be made that the specific energies of cutting, drilling, and sawing are also similar, the only difference being in the trajectories of the cutting element. Scientific papers, in which the specific energies of cutting, drilling and sawing were individually being experimented on, were observed but no scientific paper was found where an author tried to compare all three of these specific energies at once. In a doctoral thesis by Antoljak (2019.) extensive laboratory tests and field measurements were carried out at a dimension stone quarry Redi near Plano, the result of which was data about the physical and mechanical properties of rock samples from the same quarry along with equations describing the relation between cutting and drilling specific energies as a function of CERCHAR factor of abrasivity. In a scientific paper by Bagherpour and others (2020) similar laboratory tests were carried out and the result was an equation that describes the relation between specific energy for sawing with various rock characteristics including Schimazek's factor of abrasivity. Papers made by other various authors which detail the relation between CERCHAR and Schimazek’s factors of abrasivity were observed. All three specific energies were expressed as a function of Schimazek's factor of abrasivity and together with the field data from Redi quarry can be further compared
Comparison of specific energies for cutting, drilling and sawing Plano dimension stones : master's thesis
No full textZa eksploataciju mineralnih sirovina koriste se razni procesi razrušavanja stijene među koje spadaju rezanje, bušenje i piljenje. Sva tri procesa se javljaju u nekom obliku u kamenolomima arhitektonsko – građevnog kamena, gdje se primarni blokovi dobivaju kombinacijom lančane sjekačice, hidraulične rotacijske bušilice i dijamantne žične pile. Navedeni strojevi imaju različite radne veličine ali im je mehanika razrušavanja stijene gotova ista, pa je temeljem toga postavljena hipoteza kako su i specifične energije rezanja, bušenja i piljenja iste, jedina razlike je u putanji reznog elementa. U literaturi su pronađeni znanstveni radovi i doktorske disertacije u kojima su izvedena ispitivanja u kojima su se odredile specifične energije rezanja, bušenja i piljenja ali nije pronađen nijedan rad koji pokušava usporediti specifične energije sva tri procesa. U disertaciji Antoljak (2019) provedeno je terensko ispitivanje na kamenolomu Redi pored mjesta Plano u kojem su uz fizikalno-mehanička svojstva stijenskih uzoraka dobiveni i iznosi specifičnih energija rezanja i bušenja u ovisnosti o CERCHAR indeksu abrazivnosti. U znanstvenom radu Bagherpour i dr. (2020) izvedeno je ispitivanje specifične energije piljenja te je dobivena relacija u kojoj je abrazivnost izražena preko Schimazekovog faktora abrazivnosti. U literaturi su pronađena ispitivanja u kojima se iskazuju ovisnost CERCHAR i Schimazekovog faktora abrazivnosti, pomoću tih radova iznosi svih triju specifičnih energija se mogu izraziti preko Schimazekovog faktora abrazivnosti, preko tih relacija i podataka o svojstvima stijenskih uzoraka sa kamenoloma Redi iznosi za sve tri specifične energije se mogu uspoređivati.In order to excavate mineral resources some sort of rock disintegration process has to be utilized, for example cutting, drilling or sawing. All three of the processes are present in some way, shape, or form in a dimension stone quarry, where the primary blocks are obtained through the usage of chainsaws, hydraulic rotary drills and diamond wire saws. These machines have vastly different work parameters, but the way they operate on a basic level is similar, so based on that a hypothesis can be made that the specific energies of cutting, drilling, and sawing are also similar, the only difference being in the trajectories of the cutting element. Scientific papers, in which the specific energies of cutting, drilling and sawing were individually being experimented on, were observed but no scientific paper was found where an author tried to compare all three of these specific energies at once. In a doctoral thesis by Antoljak (2019.) extensive laboratory tests and field measurements were carried out at a dimension stone quarry Redi near Plano, the result of which was data about the physical and mechanical properties of rock samples from the same quarry along with equations describing the relation between cutting and drilling specific energies as a function of CERCHAR factor of abrasivity. In a scientific paper by Bagherpour and others (2020) similar laboratory tests were carried out and the result was an equation that describes the relation between specific energy for sawing with various rock characteristics including Schimazek's factor of abrasivity. Papers made by other various authors which detail the relation between CERCHAR and Schimazek’s factors of abrasivity were observed. All three specific energies were expressed as a function of Schimazek's factor of abrasivity and together with the field data from Redi quarry can be further compared
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Dug u zdravstvenom sustavu Republike Hrvatske
No full textSažetak ovog rada pruža detaljan uvid u ključne izazove zdravstvenog sustava Republike Hrvatske, analizirajući strukturu sustava, financiranje i uloge ključnih institucija, s posebnim fokusom na Hrvatski zavod za zdravstveno osiguranje. U razdoblju od 2019. do 2023. godine zabilježene su promjene u makroekonomskim pokazateljima poput BDP-a, zaposlenosti i prosječnih plaća, koje su imale izravan utjecaj na prihode HZZO-a. Unatoč blagom porastu broja aktivnih osiguranika, demografski trendovi i rastuće potrebe za zdravstvenim uslugama doprinose opterećenju sustava, uz zabrinjavajući rast dugova prema dobavljačima. Tehnološki napredak, rast troškova medicinskih usluga, te poremećaji uzrokovani ratom u Ukrajini dodatno kompliciraju financijsko stanje zdravstvenog sustava, dok uvođenje eura u Hrvatsku donosi nove izazove. Ovaj rad naglašava potrebu za reformama kako bi se osigurala dugoročna održivost sustava i kvaliteta zdravstvenih usluga. Kroz analizu unutarnjih i vanjskih čimbenika, rad pruža preporuke za buduće reforme s ciljem postizanja stabilnosti i otpornosti zdravstvenog sektora
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Učinkovitost piljenja dijamantnom žičnom pilom : završni rad
No full textDijamantna žična pila jedna je od najvažnijih strojeva u eksploataciji arhitektonsko-građevnog kamena. U ovom završnom radu se prema podacima iz literature određuju prosječne vrijednosti učinkovitosti piljenja dijamantne žične pile za različite vrste stijena. Iz tih podataka se određuje koliki utjecaj na učinkovitost imaju pojedini parametri kao što su svojstva stijene koja se pili, a pogotovo se uspoređuju karakteristike pile poput snage motora i konstrukcija dijamantne žice. Na temelju podataka iz literature najveća učinkovitost ali i najveći raspon podataka se dobiva kod piljenja mramora. Učinkovitost piljenja travertina je u prosjeku slična mramoru s manjim opsegom vrijednosti. Određeni parametri poput snage motora pile, iznosi tlačne, savojne čvrstoće i površine reza jednako utječu na učinkovitost bez obzira na vrstu stijene
Dug u zdravstvenom sustavu Republike Hrvatske
No full textSažetak ovog rada pruža detaljan uvid u ključne izazove zdravstvenog sustava Republike Hrvatske, analizirajući strukturu sustava, financiranje i uloge ključnih institucija, s posebnim fokusom na Hrvatski zavod za zdravstveno osiguranje. U razdoblju od 2019. do 2023. godine zabilježene su promjene u makroekonomskim pokazateljima poput BDP-a, zaposlenosti i prosječnih plaća, koje su imale izravan utjecaj na prihode HZZO-a. Unatoč blagom porastu broja aktivnih osiguranika, demografski trendovi i rastuće potrebe za zdravstvenim uslugama doprinose opterećenju sustava, uz zabrinjavajući rast dugova prema dobavljačima. Tehnološki napredak, rast troškova medicinskih usluga, te poremećaji uzrokovani ratom u Ukrajini dodatno kompliciraju financijsko stanje zdravstvenog sustava, dok uvođenje eura u Hrvatsku donosi nove izazove. Ovaj rad naglašava potrebu za reformama kako bi se osigurala dugoročna održivost sustava i kvaliteta zdravstvenih usluga. Kroz analizu unutarnjih i vanjskih čimbenika, rad pruža preporuke za buduće reforme s ciljem postizanja stabilnosti i otpornosti zdravstvenog sektora
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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