Low-temperature tension properties of glass-epoxy composite materials

Predmet i cilj ispitivanja prikazanih u ovom radu predstavlja određivanje zatezne čvrstoće (Rm) i modula elastičnosti (EJ staklo-epoksi kompozitnih materijala ispitivanjem na zatezanje na dve različite temperature (t=20°S i t=-50°S). Ispitivanja su izvedena prema standardu na staklo-epoksi kompozitnom materijalu različitih struktura (dve specifične težine ojačanja 210 g/m2H 550 g/m2) i orijentacija ojačanja (0°/90° i ±45°). Doprinos predstavlja i mikromehanička analiza na prelomnim površinama izvedena na stereo i elektronskom mikroskopu kojom se došlo do stvarnih modela nastanka i razvoja oštećenja pri izvedenim ispitivanjima.The aim of this paper was to present the determination of tensile strength Rm and modulus of elasticity Et of glass-epoxy composites at two different temperatures (at room temperature t=20°C, and at t =-50°C). Standard mechanical testing was carried out on glass woven-epoxy composite material with different structures (two specific weights of reinforcement, 210 g/m2 and 550 g/m2) and orientations (0°/90° and ±45°). Micromechanical analysis of failure was performed on a stereo microscope and SEM in order to determine real models and mechanisms of crack

Feasibility of using the Multinational Association of Supportive Care in Cancer antiemesis tool for assessment of chemotherapy-induced nausea and vomiting at Institute for Oncology and Radiology of Serbia and palliative care team

Introduction: Chemotherapy-induced nausea and vomiting (CINV) has been shown to adversely impact patient anxiety, quality of life, treatment adherence, and use of health care resources. The Multinational Association of Supportive Care in Cancer (MASCC) has developed a tool (MASCC Antiemesis Tool (MAT)) to improve assessment and subsequent management of CINV by enhancing communication between patients and their clinicians. This study assessed the feasibility of using the MAT in patients at the Institute for Oncology and Radiology of Serbia. The secondary objective was to describe the incidence of CINV as identified by the tool. Methods and materials: This study involved a prospective survey using the MAT in patients receiving intravenous chemotherapy. Subjects completed the MAT twice post-chemotherapy regarding CINV symptoms and returned it at their next clinic appointment. Participants were also surveyed to evaluate feasibility with regard to using the MAT. Results: Of the 35 patients recruited, 57% returned surveys. The majority of patients reported that the MAT facilitated communication with their clinician, particularly those who had experienced CINV 70% of patients who returned the MAT reported CINV; however, less than half of them had received antiemetic drugs according to the recommendations contained in international guidelines. Only four patients with CINV had antiemetic changes made for subsequent cycles. Conclusion: The MAT is a feasible tool which can improve communication of CINV symptoms between patients and clinicians, a foundational step toward improving CINV management

Through thickness optimal design of glass-epoxy composite pressure vessel

Mehaničko opterećenje kod posuda pod pritiskom uglavnom potiče od pritiska (unutrašnjeg ili spoljnjeg), kome je posuda izložena. Napon koji se usled ovakvog opterećenja javlja menja se po debljini zida. Zahvaljujući specifičnostima svoje strukture, korišćenjem kompozitnih materijala u izradi posuda pod pritiskom obezbeđuje se niz prednosti kako u oblasti tehnologije izrade, tako i u toku same eksploatacije, u odnosu na neke druge konstruktivne materijale. Njihovo oblikovanje po želji omogućava da se na taj način duž debljine ostvari optimizacija strukture. Predmet i cilj ovog rada predstavlja proračun i prikaz numeričkog modela kojim su se simulirali različiti pritisci, za različite debljine i strukture zida posude od staklo-epoksi kompozitnog materijala. Na taj način se mogu dobiti optimalne strukture za različite radne pritiske kojima posude u eksploataciji mogu biti izložene.Mechanical loading of pressure vessels mainly comes from pressure (inner and outer) under which is vessel subjected. Tension which appears changes according to the thickness of the wall. Thanks to the its specific structure, by the usage of composite materials in pressure vessels a lot of advantages are got in the field of technology of making, and during the usage, in comparison to some other constructive materials. Their shaping by the need makes it possible to optimize the structure along the thickness. The subject and aim of this work represents calculation and description of numeric model with which the different cases of the work of inner and outer pressure were simulated, for the different thickness of the wall of the pressure vessel of glass epoxy composite. In that way we come to optimal structure of material for different working pressures under which the vessels can be submitted during the usage