Prisustvo mikotoksina u smešama za ishranu svinja i živine

Mycological and mycotoxicological analysis of many feeding stuffs and complete mashes for different animal species and categories have shown that the feed safety problem has been present for years. It is approved that mouldy feed can contain various mycotoxins, but among them in our conditions the most investigated are aflatoxins, ochratoxins, zearalenone and some trichotecenes. Based on laboratory feed inspection of samples sent to be analysed in the Institute of Veterinary Medicine of Serbia in Belgrade it was concluded that fungi and mycotoxins contamination are common. Primarily presence of zearalenone, ochratoxine and aflatoxin was proven. Although these levels usually do not exceed limits laid by actual legislation, having on mind cumulative effects and possible chronicle exposure of animals to their harmful influence, appropriate and competent approach is necessary. In fact, even when direct loses, as consequence of high mortality are not present, indirect loses due to drop of animal performances and production and occurence of secondary infections must not be neglected.Mikotoksikološkim ispitivanjem uzoraka hrane za živinu i svinje utvrđeno je da je prisustvo mikotoksina veoma aktuelan problem. Pokazalo se da je naročito učestala kontaminacija mikotoksinima prisutna u hrani za svinje, i to u skoro trećini analiziranih uzoraka prevazlazeći maksimalno dozvoljene granice Pravilnikom o maksimalnim količinama štetnih materija i sastojaka u stočnoj hrani (Službeni list SFRJ, 1990). Imajući u vidu kumulativni efekat i moguću hroničnu izloženost životinja štetnom dejstvu mikotoksina i u slučaju nižih koncentracija potrebna je odgovarajuća stručna kontrola. I onda kada se ne manifestuju direktni gubici kao posledica uginjavanja životinja, ne smeju se zanemariti indirektne štete usled pada proizvodnje i pojave sekundarnih oboljenja

Kontaminacija žita aflatoksinima, metabolitima plesni Aspergillus flavus

In stored cereals besides other microorganisms, Aspergillus flavus fungi, well known aflatoxin producers, can also be found. When these feedingstuffs, as main material for feed production, are very contaminated with fungi and mycotoxins, they induce different health disturbances both in animals and humans. However, the presence of fungi is not a proof of mycotoxins contamination because thay are produced in specific conditions. By regulating this environmental situation, it is possible to prevent contamination with mycotoxins to a certain extant, as well as their expansion and their threat to health. In this paper results of microbiological and mycotoxicological examinations of 968 cereal samples (corn, wheat, bran, silage, barley, soybean, sorghum) are presented. Samples were sent from different localities in Serbia during 5 years period. At the microbiological examination of cereals it was noticed that 675 samples did not fulfilled legislative requirements regarding fungi content and the biggest difference was present in naturally dried corn. Usually were found Aspergillus spp., Penicillium spp., Fusarim spp., Mucor spp., while A. flavus was present in 154 samples. It was also noticed that aflatoxin was present in 149 samples up to 0,05 mg/kg, what was still in accordance with the actual regulations.Na osnovu rezultata mikrobiološke i mikotoksikološke analize 968 uzoraka žita (kukuruz, pšenica, mekinje, silaža, ječam, soja, sirak) koji su pristizali u ovlašćenu laboratoriju na kontrolu sa teritorije Republike Srbije u toku petogodišnjeg perioda utvrđeno je da sadržaj gljiva (plesni) kod 675 uzoraka žita ne odgovara uslovima Pravilnika o maksimalnim količinama štetnih materija i sastojaka u stočnoj hrani (Službeni list SFRJ, 1990), a najveći stepen odstupanja utvrđen je u prirodno sušenom kukuruzu. Determinacijom gljiva najčešće izolovane vrste su: Aspergillus spp., Penicillium spp., Fusarim spp., Mucor spp., a u 154 uzoraka identifikovano je prisustvo vrste Aspergillus flavus. Ispitivanjem sadržaja aflatoksina, u 149 uzoraka žita, ustanovljen je aflatoksin do koncentracije 0,05 mg/kg (ppm), što je u granicama dozvoljenim važećom regulativom

UHF RFID Antenna: Printed Dipole Antenna with a CPS Matching Circuit and Inductively Coupled Feed

This paper presents simulated (WIPL‐D pro) and measured results of a UHF RFID antenna realized with a dipole matched to a CPS (Coplanar Stripline) and inductively coupled with a small rectangular loop. Such a design enables achieving and controlling high values of the inductive reactance that is necessary for obtaining good match of the antenna to an Application Specific Integrated Circuit (ASIC) chip. The antenna is characterized by a simple and robust design, which results in low‐cost realization

Еvaluation of Thermophysical Properties of Semiconductors by Photoacoustic Phase Neural Network

The idea of this paper is to develop a method for determination thermal diffusivity, linear expansion coefficient and thickness of a semiconductor sample from photoacoustic phase measurement by using neural network. The neural network has been trained on photoacoustic phases obtained from a theoretical model of measured signal for Si n-type in the range of 20Hz to 20kHz. For the analysis of parameter determination from phases, we trained phase neural networks on a large database obtained from numerical experiments in the expected range of parameter changes. An analysis of a theoretical photoacoustic model with a phase neural network is demonstrated. The advantages of using a phase neural network with high accuracy and precision in prediction depending on the number of epochs are presented, as well as analyzes of the application of random Gaussian noise to the network in order to better predict the experimental photoacoustic signal.BPU11 : 11th International Conference of the Balkan Physical Union : Proceedings book; Aug 11 - Sep 1, 2022S07-OP Optics and Photonic

Phase Synchronization Control of Robotic Networks on Periodic Ellipses with Adaptive Network Topologies

This paper presents a novel formation control method for a large number of robots or vehicles described by Euler-Lagrange (EL) systems moving in elliptical orbits. A new coordinate transformation method for phase synchronization of networked EL systems in elliptical trajectories is introduced to define desired formation patterns. The proposed phase synchronization controller synchronizes the motions of agents, thereby yielding a smaller synchronization error than an uncoupled control law in the presence of bounded disturbances. A complex time-varying and switching network topology, constructed by the adaptive graph Laplacian matrix, relaxes the standard requirement of consensus stability, even permitting stabilization on an arbitrary unbalanced graph. The proofs of stability are constructed by robust contraction analysis, a relatively new nonlinear stability tool. An example of reconfiguring swarms of spacecraft in Low Earth Orbit shows the effectiveness of the proposed phase synchronization controller for a large number of complex EL systems moving in elliptical orbits

Search for Top Squark Pair Production in the Dielectron Channel

This report describes the first search for top squark pair production in the channel stop_1 stopbar_1 -> b bbar chargino_1 chargino_1 -> ee+jets+MEt using 74.9 +- 8.9 pb^-1 of data collected using the D0 detector. A 95% confidence level upper limit on sigma*B is presented. The limit is above the theoretical expectation for sigma*B for this process, but does show the sensitivity of the current D0 data set to a particular topology for new physics.Comment: Five pages, including three figures, submitted to PRD Brief Report

Braided Tensor Products and the Covariance of Quantum Noncommutative Free Fields

We introduce the free quantum noncommutative fields as described by braided tensor products. The multiplication of such fields is decomposed into three operations, describing the multiplication in the algebra M of functions on noncommutative space-time, the product in the algebra H of deformed field oscillators, and the braiding by factor Psi_{M,H} between algebras M and H. For noncommutativity generated by the twist factor we shall employ the star-product realizations of the algebra M in terms of functions on standard Minkowski space. The covariance of single noncommutative quantum fields under deformed Poincare symmetries is described by the algebraic covariance conditions which are equivalent to the deformation of generalized Heisenberg equations on Poincare group manifold. We shall calculate the covariant braided field commutator, which for free quantum noncommutative fields provides the field quantization condition and is given by standard Pauli-Jordan function. For ilustration of our new scheme we present explicit calculations for the well-known case in the literature of canonically deformed free quantum fields.Comment: 19 pages, v.4, final versio

Search for W~1Z~2\widetilde{W}_1\widetilde{Z}_2 Production via Trilepton Final States in ppˉp\bar{p} collisions at s=1.8\sqrt{s}=1.8 TeV

We have searched for associated production of the lightest chargino, $\widetilde{W}_1$, and next-to-lightest neutralino, $\widetilde{Z}_2$, of the Minimal Supersymmetric Standard Model in $p\bar{p}$ collisions at \mbox{$\sqrt{s}$ = 1.8 TeV} using the \D0 detector at the Fermilab Tevatron collider. Data corresponding to an integrated luminosity of 12.5$\pm 0.7$ \ipb were examined for events containing three isolated leptons. No evidence for $\widetilde{W}_1\widetilde{Z}_2$ pair production was found. Limits on $\sigma(\widetilde{W}_1\widetilde{Z}_2)$Br$(\widetilde{W}_1\to l\nu\widetilde{Z}_1)$Br$(\widetilde{Z}_2\to l\bar{l}\widetilde{Z}_1)$ are presented.Comment: 17 pages (13 + 1 page table + 3 pages figures). 3 PostScript figures will follow in a UUEncoded, gzip'd, tar file. Text in LaTex format. Submitted to Physical Review Letters. Replace comments - Had to resumbmit version with EPSF directive

Measurement of the WW Boson Mass

A measurement of the mass of the $W$ boson is presented based on a sample of 5982 $W \rightarrow e \nu$ decays observed in $p\overline{p}$ collisions at $\sqrt{s}$ = 1.8~TeV with the D\O\ detector during the 1992--1993 run. From a fit to the transverse mass spectrum, combined with measurements of the $Z$ boson mass, the $W$ boson mass is measured to be $M_W = 80.350 \pm 0.140 (stat.) \pm 0.165 (syst.) \pm 0.160 (scale) GeV/c^2$.Comment: 12 pages, LaTex, style Revtex, including 3 postscript figures (submitted to PRL

The Azimuthal Decorrelation of Jets Widely Separated in Rapidity

This study reports the first measurement of the azimuthal decorrelation between jets with pseudorapidity separation up to five units. The data were accumulated using the D{\O}detector during the 1992--1993 collider run of the Fermilab Tevatron at $\sqrt{s}=$ 1.8 TeV. These results are compared to next--to--leading order (NLO) QCD predictions and to two leading--log approximations (LLA) where the leading--log terms are resummed to all orders in $\alpha_{\scriptscriptstyle S}$. The final state jets as predicted by NLO QCD show less azimuthal decorrelation than the data. The parton showering LLA Monte Carlo {\small HERWIG} describes the data well; an analytical LLA prediction based on BFKL resummation shows more decorrelation than the data.Comment: 6 pages with 4 figures, all uuencoded and gzippe