Erozija nodularnog lijeva česticama kvarcnog pijeska

Ductile cast iron has high fatigue strength due to the spherical shape of graphite, especially after quenching and tempering. Higher toughness can be achieved by austempering. One of the advantages of ductile cast iron in relation to other cast irons is its good wear resistance. In the experiments, samples of ductile cast iron and austempered ductile cast iron were eroded with quartz sand particles at six different angles of impact (15°, 30°, 45°, 60°, 75° and 90°). The test results were presented as the loss of mass which occured during the test. Testing with quartz sand shows that the particle erosion resistance of ductile cast iron was better than that of austempered ductile iron for all impact angles except for 60°. The maximum measured wears of ductile cast iron and austempered ductile iron were at 75°.Nodularni lijev ima veliku dinamičku izdržljivost zbog kuglastog oblika grafita, naročito nakon poboljšavanja. Visoka žilavost može se postići izotermičkim poboljšavanjem. Jedna od prednosti nodularnog lijeva u odnosu na ostale željezne lijevove je njegova dobra otpornost na trošenje. U ovom istraživanju ispitivana je otpornost na erozijsko trošenje nodularnog lijeva i izotermički poboljšanog nodularnog lijeva, česticama kvarcnog pijeska pri šest različitih kutova udara (15°, 30°, 45°, 60°, 75° and 90°). Rezultati ispitivanja prikazani su gubitkom mase tijekom ispitivanja. Rezultati pokazuju da nodularni lijev ima bolju otpornost na erozijsko trošenje od izotermički poboljšanog nodularnog lijeva pri svim kutovima udara osim kod 60°. Maksimalni gubitak mase kod oba materijala zabilježen je pri kutu upada od 75°

PREVENTION AND REHABILITATION OF THE CHRONIC INJURIES IN EXCELLENT FOOTBALL

Glavni cilj ovog rada je prikaz programa rehabilitacije i prevencije najučestalijih kroničnih ozljeda u vrhunskom nogometu. U suvremenom nogometu, uz velike napore, sindrom prenaprezanja je sve češći razlog odsustva nogometaša sa treninga i natjecanja. Ovim radom se ukazuje na simptoma, uzroke nastanka i općenito o samoj kroničnoj ozljedi, tzv. sindromu prenaprezanja. Pojašnjava kako će trener i sam nogometaš prepoznati prve znakove sindroma prenaprezanja te pravilno reagirati. Naglasak rada je na najučestalijim ozljedama donjih ekstremiteta: plantarni fascitis, trkačka potkoljenica, skakačko koljeno te sindrom bolne prepone.The aim of this paper was to review rehabilitation program and prevention of chronic injuries in excellent football. In modern football,with great effort,overuse syndrome is the most common reason of absence of the player from training and competitions. This paper shows on symptoms,cause and generally about a chronic injuries,so-called overuse syndrome. It explains to the coach and football player how to recognize the first symptoms of overuse injury and how to react. The emphasis is on the most common injury of lower extremities: plantar fasciitis, shin splints,jumper's knee and groin pain syndrome

The influence of wine chemical composition and ultrasound on the inactivation of Brettanomyces yeast

Kvasac iz roda Brettanomyces pripada među najznačajnije uzročnke kvarenja crnog vina. Ovaj kvasac ima sposobnost proizvodnje hlapivih fenola, 4-etilfenola i 4-etilgvajakola koji vinu daje prepoznatljivi “brett” miris što djeluje negativno na vino. U ovom radu ispitan je utjecaj različitog kemijskog sastava vina na inaktivaciju kvasca B. bruxellensis primjenom ultrazvuka visoke snage u kombinaciji sa povišenom temperaturom (termosonifikacija). Tretman je proveden u šaržnom sustavu izotermalno u trajanju od 1, 2 i 3 minute uz prethodno zagrijavanje uzorka na 43 °C. Inaktivacija kvasca B. bruxellensis praćena je nacjepljivanjem uzoraka vina na selektivne podloge gdje se pratio rast kolonija kvasca B. bruxellensis , a senzorske karakteristike vina određivane su pomoću Triangl testa. Utvrđeno je da je ultrazvuk visoke snage u kombinaciji s povišenom temperaturom uzrokuje inaktivaciju kvasca B. bruxellensis. Variranje pH vrijednosti vina nema utjecaja na inaktivaciju kvasca B. bruxellensis, dok dodatak šećera smanjuje inaktivaciju ovog kvasca.Brettanomyces sp. yeast is considered a major spoilage yeast in red wine. It is harmful for wine because it produces volatile phenols (4-ethylphenol and 4-ethylguaiacol), compounds primarily responsible for Brett character in wine. In this study, influence of wine chemical composition and high power ultrasound in combination with high temperature (termosonification) on B. bruxellensis growth were examined. The treatment was conducted in a batch system for duration of 1, 2 and 3 minutes, while the samples were preheated at 43 °C. Inactivation of yeast B. bruxellensis was monitored by inoculation of wine samples on selective medium. Sensory characteristics of wine were determined using the Triangle test. Inactivation of B. bruxellensis growth was achieved using high power ultrasound in combination with high temperature (termosonification). The variation in the pH of wine has no effect on the inactivation of B. bruxellensis, while the addition of sugar reduces the inactivation of the yeast

Gallienus, soldatkeiseren med størst betydning for kunsthistorien

Festskrift til Johan Henrik Schreine

PREVENTION AND REHABILITATION OF THE CHRONIC INJURIES IN EXCELLENT FOOTBALL

Glavni cilj ovog rada je prikaz programa rehabilitacije i prevencije najučestalijih kroničnih ozljeda u vrhunskom nogometu. U suvremenom nogometu, uz velike napore, sindrom prenaprezanja je sve češći razlog odsustva nogometaša sa treninga i natjecanja. Ovim radom se ukazuje na simptoma, uzroke nastanka i općenito o samoj kroničnoj ozljedi, tzv. sindromu prenaprezanja. Pojašnjava kako će trener i sam nogometaš prepoznati prve znakove sindroma prenaprezanja te pravilno reagirati. Naglasak rada je na najučestalijim ozljedama donjih ekstremiteta: plantarni fascitis, trkačka potkoljenica, skakačko koljeno te sindrom bolne prepone.The aim of this paper was to review rehabilitation program and prevention of chronic injuries in excellent football. In modern football,with great effort,overuse syndrome is the most common reason of absence of the player from training and competitions. This paper shows on symptoms,cause and generally about a chronic injuries,so-called overuse syndrome. It explains to the coach and football player how to recognize the first symptoms of overuse injury and how to react. The emphasis is on the most common injury of lower extremities: plantar fasciitis, shin splints,jumper's knee and groin pain syndrome

PREVENTION AND REHABILITATION OF THE CHRONIC INJURIES IN EXCELLENT FOOTBALL

Glavni cilj ovog rada je prikaz programa rehabilitacije i prevencije najučestalijih kroničnih ozljeda u vrhunskom nogometu. U suvremenom nogometu, uz velike napore, sindrom prenaprezanja je sve češći razlog odsustva nogometaša sa treninga i natjecanja. Ovim radom se ukazuje na simptoma, uzroke nastanka i općenito o samoj kroničnoj ozljedi, tzv. sindromu prenaprezanja. Pojašnjava kako će trener i sam nogometaš prepoznati prve znakove sindroma prenaprezanja te pravilno reagirati. Naglasak rada je na najučestalijim ozljedama donjih ekstremiteta: plantarni fascitis, trkačka potkoljenica, skakačko koljeno te sindrom bolne prepone.The aim of this paper was to review rehabilitation program and prevention of chronic injuries in excellent football. In modern football,with great effort,overuse syndrome is the most common reason of absence of the player from training and competitions. This paper shows on symptoms,cause and generally about a chronic injuries,so-called overuse syndrome. It explains to the coach and football player how to recognize the first symptoms of overuse injury and how to react. The emphasis is on the most common injury of lower extremities: plantar fasciitis, shin splints,jumper's knee and groin pain syndrome

New Professionals and New Information Experts - Past, Present and Future

Cilj ovog članka je predstaviti New Professionals Special Interest Group (NPSIG), kao i hrvatsku inačicu Novi informacijski stručnjaci (NIS). U prvom dijelu članka riječ je o nastanku NPSIG-a, njihovom ustroju i aktualnim projektima, dok se drugi bavi Novim informacijskim stručnjacima nastalima po uzoru na NPSIG te ostvarenim i budućim projektima NIS-a