DENTAL PATIENTS ON ORAL ANTICOAGULANT THERAPY

Oral anticoagulant therapy (OAT) has been used for more than half a century in themanagement and prevention of thromoembolic disorders. Due to somewhat awkwardphenomena accompanying anticoagulant therapy during dental-surgical interventions,dentists have to be well acquainted with the characteristics of the therapy and themeasures to be undertaken in the management of patients on OAT. This paper aims topresent a short overview of the procedures and measures to be undertaken by a dentistin the management of patients on OAT

Recycling system for the FDM/FFF method material designed for small and medium-sized production batches

With fast growing industry in the field of additive technology, possibilities of DIY (Do It Yourself) projects grow as well. This also gives the opportunity for non-expert's users to project and develop some complex products on their own. The reaction was global overflow of the 3D printer's sale worldwide. If we look in the long term, environmental pollution caused by their disposed polymer is their biggest flaw. Recycling process sometimes can be very expensive, and in certain cases unavailable for some users. In this paper, low-cost recycling system for materials that are most commonly used for FDM/FFF method is presented. The main goal was to reduce environmental pollution and 3D printing costs by presenting the possibility of making its own polymer made of scrape plastic. Moreover, this allows users to make their own recipe by mixing different types of scrape polymer, or adding reinforcing material such as chopped dry fiber, metal powder, etc.

Recycling system for the FDM/FFF method material designed for small and medium-sized production batches

With fast growing industry in the field of additive technology, possibilities of DIY (Do It Yourself) projects grow as well. This also gives the opportunity for non-expert's users to project and develop some complex products on their own. The reaction was global overflow of the 3D printer's sale worldwide. If we look in the long term, environmental pollution caused by their disposed polymer is their biggest flaw. Recycling process sometimes can be very expensive, and in certain cases unavailable for some users. In this paper, low-cost recycling system for materials that are most commonly used for FDM/FFF method is presented. The main goal was to reduce environmental pollution and 3D printing costs by presenting the possibility of making its own polymer made of scrape plastic. Moreover, this allows users to make their own recipe by mixing different types of scrape polymer, or adding reinforcing material such as chopped dry fiber, metal powder, etc.

Contemporary approach to the design of circular form tools for complex-geometry part manufacture

Primena profilnih strugarskih noževa u industriji prisutna je unazad nekoliko decenija. Upotreba profilnih noževa u industriji je u ekspanziji, a ovu sve veću popularnost mogu pripisati smanjenju troškova proizvodnje i uštede vremena obrade. Sa druge strane, jedan od glavnih nedostataka predstavlja sam metod njihovog projektovanja. Ovaj nedostatak se ogleda kroz ograničenost obrade pravolinijskih i lučnih segmenata izratka. Grudni ugao za svaki segment ima različitu vrednost, što predstavlja dodatno ograničenje. U slučaju da je neophodna primena profilnih noževa za izradu delova složene geometrije, vrednost grudnog ugla zahtevala bi da bude nula. U ovom radu predstavljen je savremen način projektovanja kružnih profilnih noževa primenom CAD sistema. Na ovaj način, ne samo da se obezbeđuje konstantna vrednost grudnog ugla duž celog sečiva koja može biti i različita od nule, već se obezbeđuje i optimalna geometrija alata za obradu željenog materijala. Dodatno je izvršena i eksperimentalna provera geometrije profilnog noža projektovanog uz pomoć nove metode.Form tools have been used in industry for a number of decades. Their use is booming and such growing popularity can be attributed to minimized manufacturing costs and shorter manufacturing time. On the other side, one of the major drawbacks is the method of their design. It reflects in the constraints present in the machining of straight-line and circular arc segments of a workpiece. For each segment the rake angle has a different value, which imposes an additional constraint. In case it is necessary to use form tools to manufacture complex-geometry parts, the value of the rake angle would require to be zero. The paper presents contemporary design method of circular form tools by implementing CAD system. This way, it is not only provided a constant value of the rake angle across the entire cutting edge, which can be different from zero too, but also optimum tool geometry for machining a desired material. Additionally, the geometry of a form tool designed using a new method was experimentally tested

LCA of the manufacturing stage of the laboratory belt conveyor

Sprovedena je procena životnog ciklusa malog trakastog transportera. Analizirana je faza proizvodnje sa aspekata uticaja na životnu sredinu i potrošnje energije. Najveći uticaj na životnu sredinu u većini kategorija uticaja za osnovni model kategorija uticaja potiče od proizvodnje niskolegiranih čelika i potrošnje električne energije tokom faze proizvodnje, praćen uticajem transporta. U radu su takođe predloženi načini uštede energije u proizvodnoj praksi uz primenu adekvatnih tehnologija.A cradle-to-gate LCA analysis of a small belt conveyor was conducted. Manufacturing stage was analysed from the aspects of environmental impacts and energy consumption. The biggest environmental impact in majority of baseline impact categories is obtained from low-alloyed steel production and electricity consumption during the manufacturing stage, followed by impact of the transport. Ways for possible energy savings regarding manufacturing practice and technologies were proposed later on

Design and manufacture of reformer in polymer electrolyte membrane fuel cell

The paper describes the development and manufacturing aspects of the reformer in polymer electrolyte membrane (PEM) fuel cell, from the first step of realization that includes modelling the main parts of the reformer; analysing the reforming initial geometry, adopting changes in shape and dimensions caused by inaccessibility of tools during machining; and the manufacture of the reformer. Development and manufacturing are performed based on a model developed in SolidWorks (R). Based on this model, numerical analysis is performed in order to show the influence of geometry and its changes that affect reformer performance, and is not shown here. Adopted changes in the reformer design are presented, along with detailed explanation. Reformer processing is carried out on a milling machine and Wire EDM machine. The transversal hole diameter on the reformer is increased from 1 to 2 mm to reduce economic cost. Before processing, the tool path simulation is also performed. Beside the main subject, general data on proton exchange membrane fuel cell are introduced with a short description and explanations of the PEM function, method and purpose

Design and manufacture of reformer in polymer electrolyte membrane fuel cell

The paper describes the development and manufacturing aspects of the reformer in polymer electrolyte membrane (PEM) fuel cell, from the first step of realization that includes modelling the main parts of the reformer; analysing the reforming initial geometry, adopting changes in shape and dimensions caused by inaccessibility of tools during machining; and the manufacture of the reformer. Development and manufacturing are performed based on a model developed in SolidWorks (R). Based on this model, numerical analysis is performed in order to show the influence of geometry and its changes that affect reformer performance, and is not shown here. Adopted changes in the reformer design are presented, along with detailed explanation. Reformer processing is carried out on a milling machine and Wire EDM machine. The transversal hole diameter on the reformer is increased from 1 to 2 mm to reduce economic cost. Before processing, the tool path simulation is also performed. Beside the main subject, general data on proton exchange membrane fuel cell are introduced with a short description and explanations of the PEM function, method and purpose