U ovom radu su dane osnove Holzerovog postupka za određivanje kružnih frekvencija i oblika vibriranja okvira. Analiziran je i predložen postupak za određivanje dinamičkih karakteristika konzole koji ...se zasniva na Holzer-Myklestadovom postupku za grede. U danom postupku riješen je problem izbora okretanja vrha konzole pri vlastitim vibracijama tako da se na mjestu uklještenja konzole uvijek dobiva okretanje koje je blisko nuli i odgovarajući pomak za izabranu vrijednost frekvencije. Postupak je pogodan za kontrolu rješenja dobivenih primjenom računala i u procesu usvajanja znanja studenata i početnika o dinamičkim karakteristikama konzolnih građevina.
The basis of Holzer's procedure for determination of frame natural frequencies and modes of vibration are presented in this paper. The method for determination of dynamic characteristics of the ...bracket which is based on Holzer-Myklestad procedure, is analysed and proposed here. In this procedure the problem of rotation the bracket end at natural vibrations is solved, so at the fixed end of the bracket, the rotation is approximately zero and corresponding displacement is always calculated for the selected frequency. This procedure is suitable for the control of results obtained using computers and in the teaching process of students and beginners on dynamic characteristics of the bracket structures.
Ukratko su prikazani iterativni postupci rješavanja sustava linearnih algebarskih jednadžbi i metode za rješavanje nelinearnih problema konstrukcija. Metoda relaksacije je primijenjena za rješavanje ...linearnih i prilagođena je za nelinearne probleme ovisno o razmatranome problemu. Metoda omogućava izbor načina rješavanja materijalne i geometrijske nelinearnosti odvojeno ili simultano. Metoda može naći primjenu u rješavanju nelinearnih problema i u drugim područjima tehnike.
U radu su prikazane neke od približnih metoda za određivanje formi i perioda osciliranja okvirnih konstrukcija. Razmatrana je i predložena približna metoda pri čemu se u proračun ulazi sa približno ...određenim relativnim krutostima katova i prizemlja. Odstupanja rezultata dobivenih predloženim približnim postupkom od onih dobivenih točnijim proračunima maloga su reda veličina. Stoga je istaknuto da se metoda može rabiti u praksi i za kontrolu proračuna složenih sustava računalom.
: Acute infections in humans and animals caused by Coxiella burnetii (C. burnetii) are becoming an important medical problem for Bosnia and Herzegovina (B&H). From a clinical and epidemiological ...aspect, Q fever represents a complex medical problem, considering that one of the highest incidence rates of Q fever in Europe has been recorded during the last few years in B&H. The first case of this disease in B&H was described in 1950, by Muray et al., and the first epidemic, with 16 infected individuals, was recorded the same year. Confirmed animal infections by C. burnetii in B&H were first reported in 1985 when, of all tested sheep, positive results were found in 12.4%. During 2001, 2.11% of tested sheep and goats were found to have a positive result, which was also confirmed by studies from the following years in particular regions of B&H. These studies suggest that endemic loci of infected animals are established in particular geographic regions in B&H, which is important to emphasize for better understanding of the sources and routes of C. burnetii transmission to the human population. This conclusion is based on the studies from 2000, when 2.17% of positive cattle, 1.85% of positive sheep, and 0.27% of positive goats were registered. During the same period, in B&H, in 6 different regions, 156 individuals with Q fever were registered as were 3 separate epidemics with 115 infected individuals. Official data on the number of detected animal C. burnetii infections during 2002 suggest that 10 positive cattle and 88 positive sheep or goats were registered. During 2003, 24 positive cattle, 29 positive goats, and 167 positive sheep were detected, while in 2004, 71 positive cattle, 4 positive goats, 37 positive sheep, and 72 positive animals from the sheep–goat group were registered. According to official reports from 2001, 19 individuals with Q fever were registered in B&H, while in 2002, the number of infected individuals increased to 250. In five cantons in B&H, 43 infected individuals were registered during 2002, while in Republika Srpska of B&H, 207 infected individuals in the region of Banja Luka were registered. From 1998 to 2003, 373 individuals with Q fever were reported in B&H, whereof 265 individuals (71.04%) were infected during epidemics, and 108 (28.95%) sporadically. Q fever incidence rates in B&H were high during 1998 (5.68%ooo) and very high in 2000, with 115 individuals with an acute clinical form and an incidence rate of 6.95%ooo. The incubation time varied between 9 and 28 days.
