PERIPHYTIC PROTOZOA COMMUNITY ON ARTIFICIAL MACROPHYTES

U razdoblju od 7. studenog do 6. prosinca 2017. godine provedeno je istraživanje zajednice praživotinja u obraštaju na umjetnim makrofitama. Istraživanje je provedeno u Sakadaškom jezeru smještenom unutar poplavnog područja Kopački rit. Tijekom istraživanja praćene su promjene vodostaja Dunava, abiotički i biotički čimbenici vode jezera, promjene biomase perifitona te promjene kvalitativnog i kvantitativnog sastava praživotinja u obraštajnim zajednicama. Ukupno je zabilježena 51 svojta praživotinja koje pripadaju supergrupama Amoebozoa, SAR i Incertae sedis Eukaryota. Najveću brojnost i raznolikost imala je skupina Ciliophora (trepetljikaši) koja pripada supergrupi SAR. U obraštaju je najzastupljenija bila trofička skupina bakteriovora-detritivora. Unatoč sporom prirastu biomase i malim količinama obraštaja te relativno maloj brojnosti praživotinja u obraštaju, što je najvjerojatnije povezano s niskom temperaturom vode i smanjenom količinom svjetlosti tijekom istraživanog razdoblja, umjetne makrofite mogu predstavljati povoljno stanište za brojne praživotinje koje imaju važnu ulogu u prijenosu organske tvari od nižih prema višim trofičkim razinama u slatkovodnim staništimaIn the period from November 7th to December 6th 2018 the periphytic protozoan community on artificial macrophytes was studied. The study was conducted in the Sakadaš Lake, which is part of the Kopački rit floodplain. During the research Danubian water level, abiotic and biotic lake water properties, periphtyon biomass and qualitative and quantitative protozoan composition were observed. In total, 51 protozoan taxa were found, belonging to supergroups Amoebozoa, SAR and Incertae sedis Eukaryota. Ciliates (Ciliophora), belonging to supergroup SAR, were represented with the highest diversity and abundance. The bacterivores-detritivores were the most abundant trophic group in periphtyon. Despite of the slow biomass accrual, small amounts of periphyton and relatively low abundances of periphytic protozoans, most probably related to low water temperature and lower light intensity, artificial macrophytes represent suitable substrata for various protozoans which have important role in transfering organic matter from lower to higher trophic levels in freshwater habitat

Comparison of irrigated multi-electrode radiofrequency ablation and point-by-point ablation for pulmonary vein isolation in patients with persistent atrial fibrillation with persistent atrial fibrillation

Atrial fibrillation is the most common supraventricular arrhythmia in the general population. It is related to increased morbidity and mortality and reduced quality of life. Pulmonary vein isolation has emerged and today remains the cornerstone of atrial fibrillation ablation. There are multiple different tools and technologies used to achieve pulmonary vein isolation, and irrigated multi-electrode ablation was a novel tool to perform pulmonary vein isolation. It has been evaluated in patients with paroxysmal atrial fibrillation; however there is no data on use of this technology in patients with persistent atrial fibrillation. The aim of our study was to compare irrigated multi-electrode ablation with point-by-point radiofrequency (RF) ablation in patients with persistent atrial fibrillation under-going PVI. In this prospective study, we included forty-nine patients (age 60 + 9 years, 82% male). In 24 patients, the IMEA catheter was used in conjunction with an electroanatomic mapping system. Twenty-five patients undergoing RF point-by-point ablation (RF-PVI) served as a control group. Patients were followed for 12 months with 24 Holter ECG monitoring at 3, 6, and 9 months and 7 days Holter ECG at 12 months follow up. Results have confirmed our hypothesis that procedural parameters are similar between irrigated multielectrode ablation and standard point-by-point radiofrequency ablation. Procedure time was 125 + 23 min in the IMEA group and 127 + 31 min in the RF-PVI group (P = 0.79). Fluoroscopy time was 12.2 (11 – 16.1) min with IMEA compared with 5.2 (4.1 – 9.3) min in the RF-PVI group (P, 0.001). Net ablation time was 11.8 (10.2 – 15.4) min in the IMEA group compared with 33.6 (30.3 – 40.1) min in the RF-PVI group (P, 0.001). However, cumulative ablation times were significantly longer in the IMEA group compared to RF PVI group. Although complication rates were low in our study, longer cumulative ablation times could have implications on complication rates, which needs to be verified in future studies. Success rates, defined as freedom from any atrial fibrillation at 12 months were similar between the two groups. At 12 months, 16 of 24 patients (67%) in the IMEA group compared with 17 of 25 patients (68%) in RF-PVI group were free from AF (P. 0.99). In conclusion, IMEA-PVI was associated with shorter net ablation time and longer fluoroscopy time with similar procedure duration. Irrigated multi-electrode ablation recordings were not sufficient to confirm isolation in 35% of PVs. Single procedure efficacy after 12 months was similar between the two groups

TECHNICAL – TECHNOLOGICAL FACTORS OF SEEDING AND PLANTING BY GIS TECHNOLOGY – PRECISION AGRICULTURE

Precizna poljoprivreda obuhvaća racionalno korištenje poljoprivrednih repromaterijala na način da se što više preciznih i na vrijeme prikupljenih informacija uzme u obzir te se tek na osnovu tih informacija pristupi određenim zahvatima u polju. U radu se govori upravo o toj, suvremenoj, tehnologiji gospodarenja oranicama. Prikazana je sjetva pšenice i sadnja dugotrajnih nasada u sustavu precizne poljoprivrede pomoću GPS uređaja. Istraživanja sjetve pšenice su provedena na oranicama tvrtke „Belje“ d.d.. Korišten je „Ag Leader Technology“ GPS uređaj koji je sinergiran na elektronski kontrolor sijačice „Horsch Pronto 8 DC“.Ova tehnologija rezultira uštedom radnog vremena i novca, te povećanjem količine i kvalitete prinosa.Precision agriculture involves the rational use of agricultural production materials in a manner that is takes into account more accurate and timely collected informations, and only on the basis of that informations it access certain interventions in the field. This thesis speaks about this, modern technology of managing fields. It describes the sowing of wheat and planting of perennial crops in the system of precision agriculture using GPS devices. Research of sowing wheat was carried out on the fields of company" Belje " d.d . GPS device used was" Ag Leader Technology " incorporated on electronic sowing machine controller "Horsch Pronto 8 DC". This technology results in work time and money savings and increases the quantity and quality of yields

Povećanje bezbednosti i privatnosti integrisanjem sigurnog blokčejn interfejsa u arhitekturu interneta stvari

Internet stvari i blokčejn se smatraju za dve glavne tehnologije današnjice. Smanjenje kašnjena i povezanost sistema je dovelo do veće fleksibilnosti pri korišćenju aplikacija koje se nalaze na udaljenim uređajima. Najveći problem interneta stvari je to da nemaju dovoljno računarskih resusrsa, nedovoljna količina memorije i slabi procesori koji su optimizovani da troše malo energiije sprečavaju korišćenje robusnih algoritama za šifrovanje. Internet stvari se suočava sa mnogim izazovima, kao što su slaba interoperabilnost, bezbednosne ranjivosti, privatnost i nedostatak standarda. U ovom radu daje se predlog korišćenja softverskog interfejsa kao arhitekture sigurnosnog prolaza za pametne uređaje. Sigurnosni interfejs omogućava korišenje jačih kriptografskih algoritama za udaljenje servise pamethih uređaja. Ovaj pristup pobojšava bezbednost podataka koji šalju pametni uređaji korišćenjem kompitablnih algoritama za šifrovanje podataka pre nego što se proslede na udaljenje servise. Pored interfejsa u ovom radu se koristi i blokčejn tehnologiija. Razlog korišćenja blokčejn tehnolgije je da se u mrežu povezanih pametnih uređaja ubaci decentralizacija i autentifikacija. Samom integracijom blokčejna dobija se toliko potrebna anonimnost i fleksibilnost koju trenutni internet stvari nema. Blokčejn štiti interfejs svojim tehnologijama kojima se izbacuje jedna tačka kontrole, beleže se sve transakcije, proverava njihova validnost i samim tim se pruža poverenje među uređajima u jednoj mreži. Rezultat ovog rada je razvoj interfejsa koji daje podršku pametnim uređajima da koriste bilo koji kriptografski algoritam, daje mogućnost mapiranja IP adresa (engl. Internet Protocol address) i na taj način spreče pristup neautorizovani pristup mreži. Pored razvoja interfejsa, blokčejn tehnologija će biti uključena u kompitablnom režimu tako da je efikasna za rad na pametnim uređajima imajući u obzir limitacije sa resursima

TARGET – Development of Submersible ROV System for BMN Inspection

Most PWRs have penetrations in the RPV lower heads for in-core nuclear instrumentation. These penetrations generally are made of nickel-based Inconel Alloy 600. Weld materials are typically Alloy 82/182. Operating conditions of PWR plants are causing nickel-based alloys cracking through a process called primary water stress corrosion cracking (PWSCC). In 2003, the licensee for the South Texas Project Unit 1 (STP-1) identified apparent boron deposits on the lower RPV head near two bottom mounted nozzles (BMNs). The NRC issued Bulletin 2003-02 to obtain information on licensee inspection activities and inspection plans for the RPV lower head. EPRI issued MRP-206 report that provides inspection and evaluation guidelines for BMNs for PWR plants, including guidelines for periodic bare metal visual examination for evidence of primary coolant leakage, or periodic non-visual nondestructive examinations for indications of service-induced cracking. The non-visual inspections (ultrasonic testing examination) may detect service-induced degradation before through-wall cracking, leakage, circumferential cracking below the bottom of the J-groove weld, release of loose parts, or incipient boric acid wastage of the low-alloy steel reactor vessel lower head material occurs. Therefore, periodic examinations will adequately manage potential for cracking by PWSCC and preserve structural integrity. INETEC developed TARGET system for BMNs inspection, consisted of submersible ROV and specially designed probe, composed of several UT probes. UT system and technique to detect, length and depth size the service-induced degradation in the BMN volume material is developed. The EPRI NDE Center performed a technical review and validated INETEC’s ultrasonic examination technique for BMNs. Aforementioned validation was done according to requirements defined by: 1) MRP-206, 2) MRP-411

Variation of Natural Frequencies by Circular Saw Blade Rotation

In this paper the influence of circular saw blade rotation, slot shapes and number of slots on its natural frequencies and critical speeds is investigated. Firstly, the governing equation that describes the transverse vibrations of a stationary circular plate clamped at its centre is derived using Hamilton’s principle and based on Kirchhoff-Love plate theory and von Karman strain theory. The results are then compared with the ones obtained using FEM method and the FEM method is then applied to the real circular saw blade model. Finally, influence of slot shapes and number of slots on natural frequencies and critical speeds is investigated

INFLUENCE OF PIEZOELECTRIC ANISOTROPY ON ELECTROMECHANICAL PERFORMANCE OF ULTRASOUND NDT PROBES AT ELEVATED TEMPERATURES

When designing an ultrasound non-destructive (NDT) probe for high temperature applications, one has to take into account a multitude of temperature induced effects, such as the temperature dependence of key physical properties of probe materials. In this paper, the significant influence of temperature change on piezoelectric properties and piezoelectric anisotropy, and thus on the ultrasound properties of the whole probe, is discussed theoretically. This is demonstrated within the thermodynamic Landau-Ginzburg-Devonshire (LGD) framework and the KLM model of equivalent circuits for two different piezoelectric, acoustically active probe materials from the same family - barium titanate and lead titanate. These two materials are model materials for the whole family of piezoelectric perovskites, including the commercially widely used PZT and relaxor ferroelectrics PMN-PT and PZN-PT

DIFFERENCES IN PHYSICAL FITNESS PROFILES OF ATHLETES IN CYCLIC ACTIVITIES (RUNNING, CYCLING, BIATHLON)

Endurance-type disciplines (running, cycling, biathlon) define the cyclic structure of an athlete's movements, which, in addition to functional parameters, also includes an adequate fitness profile. Based on the detection, analysis and evaluation of these parameters, it is possible to define the fitness profile of the competitors as well as possible mutual differences. The current case study analyzes the fitness profile of competitors of three different disciplines (middle and long distances, cycling, ski biathlon) of top-level competitors, members of national teams. The study was conducted: Uroš Gutić (UG) - runner middle and long distances, member of AK "Sarajevo" and the BIH athletic national team; Milan Milivojević (MM) – cyclist, member of Cycling club "Borac" Čačak (Serbia), and the member Serbian national team; Stefan Lopatić (SL) – ski biathlete, member SK "Romanija" Pale, and BIH national team. A total of 12 parameters were measured to assess the fitness profile (repetitive strength, explosive strength, speed and agility). The results recorded considerable homogeneity of the sample with mutual differences. In addition to mutual differences, all study participants are characterized by an extremely good fitness profile, as shown by the measurement results.  Article visualizations

DYNAMIC BEHAVIOR OF TWO ELASTICALLY CONNECTED NANOBEAMS UNDER A WHITE NOISE PROCESS

This paper investigates the almost-sure and moment stability of a double nanobeam system under stochastic compressive axial loading. By means of the Lyapunov exponent and the moment Lyapunov exponent method the stochastic stability of the nano system is analyzed for different system parameters under an axial load modeled as a wideband white noise process. The method of regular perturbation is used to determine the explicit asymptotic expressions for these exponents in the presence of small intensity noises