Umjetna pužnica je neurosenzorička proteza, koja je suvremeni tehnički i tehnološki medicinski terapijski izbor liječenja osoba s teškom nagluhošću ili s gluhoćom. Postupak otokirurške ugradnje ...umjetne pužnice zove se kohlearna implantacija. Telemetrija je sastavni dio tog postupka. Predstavlja metodu mjerenja neuralnog odgovora slušnog živca na električnu stimulaciju. Telemetrijom se određuju pragovi čujnosti, pragovi neugode podražaja i dinamički raspon. Objektivnim parametrima telemetrije procjenjujemo i psihoakustičke parametre, koji su temelj simulacijskih mapa za buduću rehabilitaciju oštećenog sluha.
The physical and mechanical characteristics of intact rocks depend on the way of their formation, sustained deformations and the process of wearing a specific rock has been exposed to. These ...characteristics have a rather high influence on the technological process of extraction and dressing of mineral raw materials. However, the mechanical characteristics of rocks due to use of explosives for their extraction in the open pit have a more significant impact. The rock blocks extracted by blasting which are larger than the opening of the primary crusher are usually fragmented by hydraulic hammer. The paper presents the results of the testing of impact of rock hardness on fragmentation of rocks by means of hydraulic hammer and during crushing in jaw crusher. The testing was carried out on the rock samples from five quarries. According to the obtained results the hardness has a considerably larger impact on the fragmentation energy by hydraulic hammer than on the crushing energy in jaw crusher.
The physical and mechanical characteristics of intact rocks depend on the way of their formation, sustained deformations and the process of wearing a specific rock has been exposed to. These ...characteristics have a rather high influence on the technological process of extraction and dressing of mineral raw materials. However, the mechanical characteristics of rocks due to use of explosives for their extraction in the open pit have a more significant impact. The rock blocks extracted by blasting which are larger than the opening of the primary crusher are usually fragmented by hydraulic hammer. The paper presents the results of the testing of impact of rock hardness on fragmentation of rocks by means of hydraulic hammer and during crushing in jaw crusher. The testing was carried out on the rock samples from five quarries. According to the obtained results the hardness has a considerably larger impact on the fragmentation energy by hydraulic hammer than on the crushing energy in jaw crusher. PUBLICATION ABSTRACT
Fizičko-mehaničke značajke intaktne stijene ovise o načinu postanka, pretrpjelim deformacijama i procesu trošenja kojima je pojedina stijena bila izložena. Ove značajke imaju velik utjecaj na ...tehnološki proces dobivanja i oplemenjivanja mineralnih sirovina. Međutim, puno veći utjecaj imaju izmjenjena fizičko-mehanička svojstva stijena uslijed upotrebe eksploziva za njihovo otkopavanje pri površinskoj eksploataciji. Blokovi stijena dobiveni miniranjem koji su veći od ulaznog otvora primarne drobilice obično se usitnjavaju hidrauličnim čekićem. U radu su prikazani rezultati ispitivanja utjecaja tvrdoće stijena na usitnjavanje stijena hidrauličnim čekićem i tijekom drobljenja u čeljusnoj drobilici. Ispitivanje je provedeno na uzorcima stijena iz pet kamenoloma. Rezultati su pokazali da tvrdoća ima znatno veći utjecaj na energiju usitnjavanja hidrauličnim čekićem nego na energiju za drobljenje u čeljusnoj drobilici.
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