Energy use, CO2 emissions and economic growth – causality on a sample of SEE countries

The primary aim of this study is to examine the causal relations between energy use, CO2 emissions and economic growth, using the examples of Greece and Bulgaria. The empirical evidence on South Eastern Europe (SEE) considering this research is quite sparse, so there is merit in the analysis of the paper. Vector Error Correction model with annual data from 1980 to 2010 has been used in order to determine potential causality between the variables. The empirical findings indicate that, in the long run there is causality from energy and CO2 emissions to economic growth in both countries. In the short run, there is no causality between energy and economic growth neither on Greece nor on Bulgaria. Based on the results of the analysis certain recommendations can be presented considering energy policy in the long run, through the orientation to saving energy could have negative impact on economic growth

Brachistochronic rigid body general motion

Razmatra se minimizacija vremena kretanja krutog tela uz neizmenjenu vrednost mehaničke energije. Za generalisane koordinate uzete su koordinate centra masa i Ojlerovi uglovi, čije su vrednosti zadate na početku i kraju intervala kretanja. Zadatak je rešen primenom Pontrjaginovog principa maksimuma. Numeričko rešenje dvotačkastog graničnog problema dobijeno je metodom konačnih razlika za sisteme običnih diferencijalnih jednačina. .The time interval minimization of rigid body motion with constant mechanical energy has been considered in this paper. Generalized coordinates are Cartesian's coordinates of mass center and the Euler's angles, which are specified at the initial and the final position. The problem has been solved by the application of the Pontryagin's principle. Finite difference method has been applied in order to obtain the solution of the two-point boundary value problem.

The effect of presidential election in the USA on stock return flow – a study of a political event

The subject of this paper is to determine the statistical significance of abnormal return that appeared on the New York Stock Exchange after the presidential election in the USA in November 2012. The analysis is focused on securities of the financial institutions listed on the New York Stock Exchange, whereby 85 companies have been included. For the purposes of the analysis a standard methodology of event study has been used. In general, parametric tests show a statistically significant negative impact of the event on stock return, whereby with the nonparametric tests there is no consistent estimation. This paper provides an interpretation of the results

The effect of presidential election in the USA on stock return flow – a study of a political event

The subject of this paper is to determine the statistical significance of abnormal return that appeared on the New York Stock Exchange after the presidential election in the USA in November 2012. The analysis is focused on securities of the financial institutions listed on the New York Stock Exchange, whereby 85 companies have been included. For the purposes of the analysis a standard methodology of event study has been used. In general, parametric tests show a statistically significant negative impact of the event on stock return, whereby with the nonparametric tests there is no consistent estimation. This paper provides an interpretation of the results

Adding zeolite 'minazel-plus' in feeding Oncorhynchus mykiss (Walbaum) and its influence on morphometrical characteristics

The influence of natural zeolite was analyzed, as a food additive applied in a concentration of 0,8% on morphometrical characteristics and basic production index of Rainbow Trout Oncorhynchus mykiss (Walbaum) breeding. By analyzing the obtained results it is found that the presence of zeolite in the trout food has a positive effect with a statistical significance (p<0,05 ) on all analyzed morphometrical indexes of the fish growth rate, on their final body weight, total body length, body length and height, as well as their growth. Including zeolite in the trout mixture had a stimulative effect on the accomplished results of the basic production index of the condition factor (CF), the coefficient of total growth (CTG) and production index (PI) in comparison with the Co-group of fish that are fed without adding zeolite to food

Application of aromatic plant extract apples in nutrition chinchillas (Chinchilla lanigera)

In this paper we studied the effect of apple aroma as a food additive in a concentration of 0.04% on performance and reduction of fur chewing and basic production parameters. During the experimental period (30 days), the experimental group of chinchillas that was fed with the pellet mixture with the addition of the aroma showed a statistically significant decrease in fur chewing (p<0.01) in comparison with the control group. Also, only 5% of the animals in the experimental group chewed fur out of the total number in that group (20 chinchillas), whereas the percentage of fur chewing with the control group with the same number of animals was 30%. The positive effects of aroma addition were noted for other examined factors as well, since the experimental group of chinchillas showed a bigger increase in body mass (1.36%), better growth (21.18%), increased food consumption (0.48%) and better conversion (17.13%) in comparison with the control group that was not fed with the aromatic additive

Turning HILIC/RP point - biomimetic retention parameter

U uslovima su kojima su istovremeno prisutni dualni hidrofilni (HILIC) i reverzno-fazni (RP) mehanizmi ispitan je retencioni profil liganada imidazolinskih i serotoninskih receptora (1). Razmotreno je biomimetičko značenje parametra retencije (prevojna tačka), koji definišu uslove u kojima dolazi do smene videćih mehanizama interakcije. Retencioni profil 43 liganada imidazolinskih i serotoninskih receptora je ispitan na Acclaim Mixed-Mode HILIC-1 koloni. Kao mobilna faza korišćena je smeša acetonitrila i 20 mM amonijum-acetata (pH 6). Hromatografsko ponašanje definisano je kao zavisnost retencionog parametra logk u odnosu na udeo acetonitrila u mobilnoj fazi (φ) korišćenjem multimodalne jednačine (2). Prevojna tačka HILIC/RP regiona izračunata je kao minimalna vrednost dobijene funkcije. Uočeno je da dobijene vrednosti prevojne tačke korelišu sa lipofilnom profilnom ispitivanih jedinjenja (r > 0.70), potencijalom vezivanja za ukupne proteine plazme (r > 0.77), kao i procentom apsorpcije leka iz gastrointesinalnog trakta (r > 0.56). Fizičko-hemijske interakcije koje utiču na vezivanje ispitivanih jedinjenja za arilhidrokarbonske receptore (NR.AhR) u organizmu, uključene u regulaciju toksikološkog potencijala, takođe utiču i na vrednosti prevojne prevojne tačke (r > 0.60). Na osnovu dobijenih rezultata, zaključuje se da se prevojna tačka dualnih HILIC/RP interakcija može uspešno primeniti u preliminarnoj karakterizaciji biofarmaceutskog i farmakokinetičkog profila liganada imidazolinskih i serotoninskih receptora.The retention profile of imidazoline and serotonin receptor ligands was investigated in dual hydrophilic (HILIC) and reversed-phase (RP) interaction mode (1). The biomimetic meaning of the turining point that defines the switch between the leading retention mechanisms was discussed. The retention profile of 43 imidazoline and serotonin receptor ligands was investigated on an Acclaim Mixed-Mode HILIC-1 column. A mixture of acetonitrile and 20 mM ammonium acetate (pH 6) was used as the mobile phase. The retention was defined as the change of the parameter logk in relation to the volume fraction of acetonitrile in the mobile phase (φ) using the multimodal equation (2). The turning point of the HILIC/RP region was calculated as the minimum value of the multimodal equation. The obtained values of the turning point correlate with the lipophilic profile of the tested compounds (r > 0.70), as well as with the binding potential for total plasma proteins (r > 0.77), and the percentage of drug absorption from the gastrointestinal tract (r > 0.56). The physico-chemical interactions that affect the binding of the tested compounds to arylhydrocarbon receptors (NR.AhR) in the organism, involved in the regulation of toxicological potential, also affect the turning point values (r > 0.60). It can be concluded that the turning point of dual HILIC/RP interactions can be successfully applied in the preliminary characterization of the biopharmaceutical and pharmacokinetic profile of imidazoline and serotonin receptor ligands.Treći naučni simpozijum Saveza farmaceutskih udruženja Srbije sa međunarodnim učešćem „Lekovi za specifične populacije pacijenata: inovacijama ka unapređenju zdravstvenih ishoda“, Niš, Srbija, 26. oktobar 2023

MOEGLICHKEITEN DER ANWENDUNG FACHKUNDIGER METHODEN ZUR OPTIMIERUNG DER WARTUNG VON ABWASSERSYSTEMEN

U radu je dan pregled dosadašnjih istraživanja o mogućnostima primjene ekspertnih metoda (umjetne neuronske mreže, genetski algoritmi, ekspertni sustavi, stabla odlučivanja, Markovljevi lanci i algoritam kolonije mrava) za optimizaciju održavanja sustava odvodnje. Pravodobno održavanje sustava odvodnje važno je zbog njegova pravilnog funkcioniranja, manjih troškova popravaka i osiguranja osnovne funkcije sustava odvodnje, te odvođenja otpadne vode iz kućanstava do uređaja za pročišćavanje otpadnih voda i ispuštanja u prijamnik. Navedene su moguće primjene ekspertnih metoda u optimizaciji održavanja sustava odvodnje čiji je cilj smanjiti troškove održavanja.This paper provides an overview of the state-of-the-art research on the possibilities of using expert methods (artificial neural networks, genetic algorithms, expert systems, decision trees, Markov chains, and ant colony algorithm) for optimising maintenance of sewerage systems. Timely maintenance of sewerage systems is significant as it ensures their proper functioning, repair cost reductions, basic operation of the system, drainage of waste water from households to wastewater treatment plants, and discharge to the receiving water body. Possible uses of expert methods for optimising maiIn dieser Arbeit werden bisherige Forschungsergebnisse zu den Möglichkeiten des Einsatzes von fachkundigen Methoden (künstliche neuronale Netze, genetische Algorithmen, Expertensysteme, Entscheidungsbäume, Markov-Ketten und Ameisenkolonie-Algorithmus) zur Optimierung der Wartung von Abwassersystemen vorgestellt. Die rechtzeitige Wartung des Abwassersystems ist wichtig, da es ordnungsgemäß funktioniert, die Reparaturkosten senkt und die Grundfunktionen des Abwassersystems sicherstellt sowie das Abwasser aus Haushalten in die Kläranlage leitet und in den Auffangbehälter ablässt. Es werden mögliche Anwendungen von fachkundigen Methoden zur Optimierung der Wartung von Abwassersystemen mit dem Ziel, die Wartungskosten zu senken, aufgeführt