Fazni prijelaz drugog reda izazvan zamrznutim nasumičnim razrjeđenjem u 3D

The effect of the quenched random dilution on the ferromagnetic transitions, in particular, the conversion from the first- to second-order transition is discussed. The new results are presented for the diluted three-dimensional three-state Potts model. The critical exponents of the disorder-induced second-order phase transition are derived by the finite-size scaling analysis of the moments of the energy and the largest cluster, obtained from the Monte Carlo simulations.Raspravlja se učinak nasumičnog, zamrznutog razrjeđenja na feromagnetske prijelaze, posebice na promjenu iz prijelaza prvog u onaj drugog reda. Prikazani su novi rezultati za razrijeđeni trodimenzijski Pottsov model s tri stanja. Kritični eksponenti faznog prijelaza drugog reda izazvanog neredom izvedeni su ljestvičnom analizom momenata energije i najvećeg grozda, dobivenih Monte Carlo simulacijama

GENETIC MARKERS ASSISTED SELECTION IN AQUACULTURE

Akvakultura je industrija u razvoju s ukupnom globalnom vrijednošću od 56 milijardi dolara. Proizvodnja se temelji na oko 210 vrsta, od kojih šarani i kamenice imaju najveću proizvodnju. Neke od vrsta u akvakulturi nastoje se proizvodno unaprijediti ciljanim selekcijskim radom, koji se primarno temelji na metodama populacijske genetike. Glavni cilj uzgojnih programa u akvakulturi jest povećanje profitabilnosti i održivosti, uz očuvanje genetske varijabilnosti uzgajanih vrsta. Aktualnim uzgojno–selekcijskim programima nastoje se unaprijediti salmonidi, škampi i tilapije, uz napomenu da su pozitivni učinci kod salmonida najizraženiji. Tijekom zadnjih desetljeća razvoj molekularne genetike omogućio je pojačavanje selekcijskoga pritiska putem uporabe genetskih markera koji imaju izravne ili posredne učinke na proizvodne odlike. Cilj je ovog rada prikazati nova dostignuća, mogućnosti, ali i probleme pri integraciji markerima potpomognute selekcije u akvakulturi.Aquaculture is an increasing industry, with a total value of 56 billion US$. Production is based on about 210 species of which the carps and oysters have the largest world–wide production. Aquaculture industry strives to improve production of some species with selection targeted work, which is primarily based on methods of population genetics. The main goal of breeding programs in aquaculture is to increase the profitability and sustainability, while maintaining genetic variability in the cultured stock. Current breeding selection programs strive to improve salmonids, shrimps and tilapia with the proviso that the positive effects at salmonids are most stated. During the last decade development of molecular genetics provides the ability of increasing selection pressure through the use of genetic markers that have direct or indirect effects on the production value. The aim of this work is giving the display of new achievements, capabilities, but also having problems in the integration of marker assisted selection in aquaculture

Procjena skeletne zrelosti kod različitih obrazaca vertikalnoga rasta lica

Objective: To assess whether there are differences in skeletal maturation among subjects with horizontal, vertical, and neutral facial growth patterns. Material and methods: The study was performed on 48 latero-lateral craniographs of patients with horizontal, 48 with vertical and 50 with neutral growth patterns aged 12 to 18 years. Eight variables from the Zagreb 82 MOD, Bracchetti and Accord analysis, were selected for measuring angular and linear parameters on latero-lateral craniographs. The assessment of skeletal maturation was done by using the CVMS method. Results: Sta-tistical analysis showed significant differences in skeletal maturity (p 0.05) in skeletal maturity among subjects with ver-tical growth patterns compared with horizontal and neutral. In terms of stages of skeletal maturity, patients with a horizontal and neutral growth pattern in the younger group were on average in the fourth stage, and those with a vertical growth pattern in the third stage. In the older group, patients with a horizontal and neutral growth pattern were on average in the fifth stage of skeletal maturity and those with a vertical growth pattern in the fourth stage. Conclusion: According to the growth pat-tern, patients differ in the stage of skeletal maturity.Svrha rada: Odrediti postoji li razlika u stupnju skeletne zrelosti između pacijenata s horizontalnim, vertikalnim i neutralnim obrascem vertikalnoga rasta lica. Materijal i metoda: U istraživanju je korišteno 48 laterolateralnih kraniograma pacijenata u dobi od 12 do 18 godina s horizontalnim obrascem vertikalnoga rasta lica, 48 s vertikalnim i 50 s neutralnim. Za procjenu obrasca korišteno je osam varijabli iz MOD analize Zagreb 82, a za određivanje stupnja skeletne maturacije metoda prema Baccettiju i Accordu. Rezultati: Statistička analiza pokazala je značajne razlike u stupnju skelet-ne zrelosti (p 0,05) u stupnju skeletne zrelosti kod pacijenata s vertikalnim obrascem rasta u odnosu prema onima s horizontalnim i neutralnim. Pacijenti s horizontalnim i neutralnim obrascem rasta unutar mlađe dobne skupine bili su najčešće u četvrtom stupnju skeletne zrelosti, a oni s vertikalnim u trećem. Unutar starije dobne skupine, pacijenti s horizontalnim i neutralnim obrascem rasta najčešće su bili u petom stupnju, a oni s vertikalnim u četvrtom stupnju skeletne zrelosti. Zaključak: S obzirom na obrazac rasta, pacijenti se razlikuju u stupnju skeletne zrelosti

Critical behavior of the long-range Ising chain from the largest-cluster probability distribution

Monte Carlo simulations of the 1D Ising model with ferromagnetic interactions decaying with distance $r$ as $1/r^{1+\sigma}$ are performed by applying the Swendsen-Wang cluster algorithm with cumulative probabilities. The critical behavior in the non-classical critical regime corresponding to $0.5 <\sigma < 1$ is derived from the finite-size scaling analysis of the largest cluster.Comment: 4 pages, 2 figures, in RevTeX, to appear in Phys. Rev. E (Feb 2001

Elektro-otporno zavarivanje i njegove industrijske primjene

U završnom radu su obrađeni postupci elektrootpornog zavarivanja. Rad se sastoji od teorijskog i eksperimentalnog dijela. U teorijskom dijelu rada je data podjela procesa elektrootpornog zavarivanja te njihov detaljan opis. Detaljno su opisani parametri svakog postupka te njihov utjecaj na kvalitetu zavarenog spoja, također su dati primjeri primjene u industriji svakog o procesa. Opisani su uređaji za elektrootporno zavarivanje i zavarljivost materijala ovim procesima. Eksperimentalni dio završnog rada proveden je u Laboratoriju Fakulteta elektrotehnike, strojarstva i brodogradnje. Elektrootpornim točkastim zavarivanjem zavareni su limovi od ugljičnog i nehrđajućeg čelika te od tehnički čistog aluminija debljine 2 mm. Zavareni spojevi su ispitani razaranjem ali su okarakterizirani i geometrijski. Obradom rezultata ispitivanja došlo se do spoznaja kako promatrani parametari – duljina protoka struje i sila utječu na zavareni spoj.The final work deals with the procedures of resistance welding. The paper consists of a theoretical and an experimental part. In the theoretical part of the paper, the division of resistance welding processes and their detailed description are given. The parameters of each process and their influence on the quality of the welded joint are described in detail, and examples of industrial applications of each process are given. Devices for resistance welding and weldability of materials by these processes are described. The experimental part of the final work was conducted in the laboratory of the Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture. Sheets of carbon and stainless steel and commercially pure aluminum 2 mm thick were welded by electric resistance spot welding. Welded joints were tested for destruction but were also characterized geometrically. By processing the test results, it was realized that the observed parameters - current length and force affect the welded joint

Elektro-otporno zavarivanje i njegove industrijske primjene

U završnom radu su obrađeni postupci elektrootpornog zavarivanja. Rad se sastoji od teorijskog i eksperimentalnog dijela. U teorijskom dijelu rada je data podjela procesa elektrootpornog zavarivanja te njihov detaljan opis. Detaljno su opisani parametri svakog postupka te njihov utjecaj na kvalitetu zavarenog spoja, također su dati primjeri primjene u industriji svakog o procesa. Opisani su uređaji za elektrootporno zavarivanje i zavarljivost materijala ovim procesima. Eksperimentalni dio završnog rada proveden je u Laboratoriju Fakulteta elektrotehnike, strojarstva i brodogradnje. Elektrootpornim točkastim zavarivanjem zavareni su limovi od ugljičnog i nehrđajućeg čelika te od tehnički čistog aluminija debljine 2 mm. Zavareni spojevi su ispitani razaranjem ali su okarakterizirani i geometrijski. Obradom rezultata ispitivanja došlo se do spoznaja kako promatrani parametari – duljina protoka struje i sila utječu na zavareni spoj.The final work deals with the procedures of resistance welding. The paper consists of a theoretical and an experimental part. In the theoretical part of the paper, the division of resistance welding processes and their detailed description are given. The parameters of each process and their influence on the quality of the welded joint are described in detail, and examples of industrial applications of each process are given. Devices for resistance welding and weldability of materials by these processes are described. The experimental part of the final work was conducted in the laboratory of the Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture. Sheets of carbon and stainless steel and commercially pure aluminum 2 mm thick were welded by electric resistance spot welding. Welded joints were tested for destruction but were also characterized geometrically. By processing the test results, it was realized that the observed parameters - current length and force affect the welded joint