Affective role of the teacher: the conceptualization and empirical validation of the construct.

Interesovanje istraživača za ulogu emocija u nastavi je novijeg datuma. U klasifikaciji nastavničkih uloga koju su dali Ivić i saradnici (2003) navodi se uloga nastavnika kao partnera u afektivnoj interakciji kao jedna od profesionalnih uloga nastavnika, ova uloga nije elaborirana, te samim tim ne postoje precizno definisana očekivana ponašanja nastavnika koja bi proizilazila iz ove njegove uloge. Predmet istraživanja je konceptualizacija (definicija i klasifikacija) i empirijska provera konstrukta afektivna uloga nastavnika...Research interest into the role emotions play in the teaching process is rather recent. In the classification of teachers’ roles provided by Ivić et al. (2003) one of the roles is teachers’ role as a partner in affective interaction with pupils. As one of the professional roles of the teacher, this role is not elaborated upon, and thus there are no precisely defined expected forms of teacher behavior which would stem from his role. The subject matter of this study is the conceptualization (definition and classification) and empirical validation of the construct of the affective role of the teacher..

Multielement determination using inductively coupled plasma optical emission spectrometry for metal characterization of water from artesian wells in Semberija region: Multivariate analysis of data

The concentrations of fifteen metals (Mg, Na, Ca, K, Se, Zn, Mn, Fe, Pb, Cr, Cu, Cd, Sb, Ni, Co) were determined in water from ten artesian wells (AW) in Semberija to obtain a general metal profile of water in this region. Principal components analysis (PCA) was used in this classification. Using principal component analysis two factors controlling the metal variability were obtained, which accounted for nearly 71.5% of the total variance. Natural (lithogenic) factor is represented by PC1, while anthropogenic factor is represented by PC2. PC1 with high contribution of Mn, Mg, Na, K, Ca, Zn and Se accounting for 41.84% of the total variance, while PC2 exhibits high loading for Cd, Ni, Sb, Cr and Pb (29.66%). Three general areas (clusters) with different metal characteristics were detected. Water from artesian wells in first cluster (AW1, AW2, AW3, AW4, AW5 and AW6) had much higher metal concentration compared with those in the second (AW7, AW8 and AW9) and third cluster (AW10). That is as a result of anthropogenic inputs. Also, the analysis of water demonstrated slightly elevated values for Mn (concentrations up to 0.176 mg/L), while concentrations of the other investigated elements are below the values recommended by the World Health Organization (WHO) and the United States Environmental Protection Agency (US EPA). [Projekat Ministarstva nauke Republike Srbije, br. 172047

On some new pre-orders defined by weighted Drazin inverses

In this paper, we investigate new binary relations defined on the set of rectangular complex matrices based on the weighted Drazin inverse and give some characterizations of them. These relations become pre-orders and improve the results found by the authors in Hernandez et al. (2013) as well as extend those known for square matrices. On the other hand, some new weighted partial orders are also defined and characterized. The advantages of these new relations compared to the ones considered in the mentioned paper are also pointed out.N. Thome was partially supported by Ministerio de Economia y Competitividad of Spain (Grant DGI MTM2013-43678-P and Red de Excelencia MTM2015-68805-REDT).Hernández, AE.; Lattanzi, MB.; Thome Coppo, NJ. (2016). On some new pre-orders defined by weighted Drazin inverses. Applied Mathematics and Computation. 282:108-116. https://doi.org/10.1016/j.amc.2016.01.055S10811628

EFFECT OF STORAGE TEMPERATURE AND THERMAL PROCESSING ON CATECHINS, PROCYANIDINS AND TOTAL FLAVONOIDS STABILITY IN COMMERCIALLY AVAILABLE COCOA POWDERS

Storage stability of catechin, epicatechin, procyanidins B1-B4 and total flavonoids in cocoa powder samples was studied over the temperature range 4-35 ºC. Thermal stability of total flavonoids was studied over the temperature range 95-125 ºC. Total flavonoids concentration decreased as a function of time and the degradation was accelerated at higher temperatures: a half-life (t1/2) of total flavonoids was much shorter at room temperature than during cold storage. A first-order kinetic model fitted well to all the data. Temperature dependence of the degradation rate constants, described by the Arrhenius equation, was more pronounced during heating than during storage. In the temperature interval from 4 ºC to 35 ºC, the calculated activation energies (Ea) for catechin, epicatechin and procyanidins B1-B4 were 20.4 kJ/mol, 12.5 kJ/mol, 9.4 kJ/mol, 21.6 kJ/mol, 19.4 kJ/mol, 23.7 kJ/mol, respectively. UTICAJ TEMPERTURE ČUVANJA I ZAGREVANJA NA SADRŽAJ KATEHINA; PROCIJANIDINA I UKUPNIH FENOLA KOMERCIJALNIM UZORCIMA KAKAOA U PRAHUUticaj temperature čuvanja na stabilnost katehina, epikatehina, procijanidina B1-B4 i ukupnih flavonoida u uzorcima kakaoa u prahu praćen je u temperaturnom opsegu od 4 ºC do 35 ºC. Uticaj zagrevanja na sadržaj ukupnih flavonoida je praćen u temperaturnom opsegu od 95 ºC do 125 ºC. U toku skladištenja uzoraka je došlo do smanjenja u sadržaju ukupnih flavonoida. Pomenuta promena je bila izraženija na višim temperaturama: vreme polu-života (t1/2) ukupnih flavonoida u ispitivanom uzorku kakaoa u prahu bilo je kraće kada je on čuvan na sobnoj temperaturi nego kada je čuvan u frižideru. Promene u sadržaju flavonoida u ispitivanim uzorcima prate kinetiku prvog reda. Konstante brzine degradacije, izračunate pomoću Arenijusove jednačine, veće su tokom zagrevanja nego tokom čuvanja ispitivanih uzoraka na nižim temperaturama. Izračunate energije aktivacije (Ea) za katehin, epikatehin i procijanidine B1, B2, B3 i B4 u temperaturnom intevalu od 4 ºC do 35 ºC  bile su: 20,4 kJ/mol, 12,5 kJ/mol, 9,4 kJ/mol, 21,6 kJ/mol, 19,4 kJ/mol i 23,7 kJ/mol. HIGHLIGHTS Storage stability of (epi)catechin, procyanidins B1-B4 and total flavonoids in cocoa powder samples was studied(temperature range 4-35 °C)The stability of the total flavonoids was studied over the temperature range 95-125 °CThe degradation of the total flavonoids was significantly accelerated at higher temperaturesTemperature dependence of the degradation rate constants was more pronounced during heating than during storag

Pine Pitch Canker and Insects: Regional Risks, Environmental Regulation, and Practical Management Options

Producción CientíficaPine pitch canker (PPC), caused by the pathogenic fungus Fusarium circinatum (Nirenberg and O’ Donnell), is a serious threat to pine forests globally. The recent introduction of the pathogen to Southern Europe and its spread in Mediterranean region is alarming considering the immense ecological and economic importance of pines in the region. Pines in forests and nurseries can be infected, resulting in severe growth losses and mortality. The pathogen is known to spread in plants for planting and in seeds, and results from recent studies have indicated that F. circinatum may also spread through phoretic associations with certain insects. With this review, we aim to expand the current understanding of the risk of insect-mediated spread of PPC in different parts of Europe. Through the joint action of a multinational researcher team, we collate the existing information about the insect species spectrum in different biogeographic conditions and scrutinize the potential of these insects to transmit F. circinatum spores in forests and nurseries. We also discuss the impact of environmental factors and forest management in this context. We present evidence for the existence of a high diversity of insects with potential to weaken pines and disseminate PPC in Europe, including several common beetle species. In many parts of Europe, temperatures are projected to rise, which may promote the activity of several insect species, supporting multivoltinism and thus, further amplifying the risk of insect-mediated dissemination of PPC. Integrated pest management (IPM) solutions that comply with forest management practices need to be developed to reduce this risk. We recommend careful monitoring of insect populations as the basis for successful IPM. Improved understanding of environmental control of the interaction between insects, the pathogen, and host trees is needed in order to support development of bio-rational strategies to safeguard European pine trees and forests against F. circinatum in future.European Cooperation in Science and Technology (COST Action FP1406 PINESTRENGTH)Ministerio de Economía, Industria y Competitividad - Fondo Europeo de Desarrollo Regional (project AGL2015-69370-R)Portuguese Foundation for Science and Technology (contract IF/00471/2013/CP1203/CT0001)Russian Foundation for Basic Research (grant 17-04-01486)Saint Petersburg State Polytechnical University (project 2019-0420

A guided tour of asynchronous cellular automata

Research on asynchronous cellular automata has received a great amount of attention these last years and has turned to a thriving field. We survey the recent research that has been carried out on this topic and present a wide state of the art where computing and modelling issues are both represented.Comment: To appear in the Journal of Cellular Automat

Electronic structure of silver-bismuth iodide rudorffite nanomaterials studied by synchrotron radiation soft X-ray photoemission spectroscopy

Silver-bismuth iodide (Ag-Bi-I) rudorffites are chemically stable and non-toxic materials that can act as a possible replacement for methylammonium lead halide perovskites in optoelectronic devices. In this report we will present innovative routes for fabrication of AgBi-I nanomaterials, as well as the results of the investigation of the electronic structure of isolated Ag-Bi-I nanoparticles by soft X-ray aerosol photoemission spectroscopy [1, 2]. Aerosol photoemission spectroscopy allows studies of the electronic structure of submicrometer particles that are free from the influence of a substrate or solvent [1-5]. In this approach the aerosol particles can be produced directly from a solution or a colloidal dispersion, which opens a possibility for investigation of a variety of nanosystems that can be produced by wet chemistry methods. This technique relies on the interaction of focused beam of isolated particles with ionizing radiation under high vacuum conditions. In addition, by using tunable synchrotron radiation as an excitation source it is possible to obtain highresolution photoelectron spectra in the investigated photoelectron energy range.X Serbian Ceramic Society Conference - Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts; September 26-27, 2022; Belgrad

The star partial order and the eigenprojection at 0 on EP matrices

[EN] The space of n x n complex matrices with the star partial order is considered in the first part of this paper. The class of EP matrices is analyzed and several properties related to this order are given. In addition, some information about predecessors and successors of a given EP matrix is obtained. The second part is dedicated to the study of some properties that relate the eigenprojection at 0 with the star and sharp partial orders. 2012 Elsevier Inc. All rights reserved.This paper was partially supported by Ministry of Education of Argentina (PPUA, Grant Resol. 228, SPU, 14-15-222) and by Universidad Nacional de La Pampa, Facultad de Ingenieria (Grant Resol. No 049/11).Hernández, AE.; Lattanzi, MB.; Thome, N.; Urquiza, F. (2012). The star partial order and the eigenprojection at 0 on EP matrices. Applied Mathematics and Computation. 218(21):10669-10678. https://doi.org/10.1016/J.AMC.2012.04.034S10669106782182

Istraživanje osnovnih parametara mehanizacije u cilju unapređenja proizvodnje, uštede energije i očuvanja životne sredine u poljoprivredi

Project 12M12 is realized in the scope of ten subproject in accordance with program, which is defined by agreement of ministry for period 1996-2000. There were about 120 scouter included in started year and about 80 scouter in final year. 911 papers were published in domestic or foreign journals or on scientific meetings. 25 monographs were published and 5 dissertation and 5 M. Sc. thesis were defended in the scope of project based on research. The situation of agricultural technique has been researched, necessities have been estimated and directions of development of power machines, tractors, processing technique, agricultural machines, vegetable production, animal husbandry, fruit growing, viticulture, mechanization for production salutary, spices and aromatic plants have been defined. The available methods have been advanced and the new methods have been developed for selection and forming tractor's systems and optimization structure and composition of engineering park in the agriculture. The soil compaction has been researched and changes have been established under effect of tractor's wheels, machines and transport vehicles and criterions have been set for reduction and supervision of soil compaction. The damages, appeared because of overmuch compaction, were estimated on 250- 300 USA $/ha per year. The new methods and equipment for prescience pull of tractor have been recommended. The powerful factors of fuel consumption have been affirmed and technology for production and reliance of alternative fuels (bio-diesel and generator gas) have been defined. The reliability of tractors and machines has been researched. The new and available technology and technical solutions of working of the soil, seeding and planting, mechanical and chemical care, collecting, finishing and storage agricultural products have been developed and reformed. The probability of application of sceaning method, method finalled elements, regression analysis, multicriterion optimization, fuzzy logic and neuron's networks, numeric analysis and others methods in process of outlay, projecting and concurring the new settlements of agricultural machines have been researched.Projekat Ministarstva nauke Republike Srbije, br. 12M12 realizovan je u okviru deset potprojekata prema programu koji je definisan ugovorom sa ministarstvom za period 1996-2000. godine. U izradi projekta učestvovalo je oko 120 istraživača u početnoj godini i oko 80 u završnoj godini. Objavljeno je 911 radova u domaćim ili inostranim časopisima ili na naučnim skupovima. Na osnovu istraživanja u okviru projekta objavljeno je 25 monografija i odbranjeno pet doktorskih i pet magistarskih teza. Istraženo je stanje poljoprivredne tehnike, procenjene potrebe i definisani pravci razvoja pogonskih mašina, traktora, procesne tehnike, mehanizacije u ratarstvu, povrtarstvu, stočarstvu, voćarstvu, vinogradarstvu, mehanizacije za proizvodnju lekovitog, začinskog i aromatičnog bilja. Unapređene su postojeće i razvijene nove metode za izbor i formiranje traktorskih sistema i optimizaciju strukture i sastav mašinskog parka u poljoprivredi. Istraživano je sabijanje zemljišta i utvrđene su promene nastale pod dejstvom točkova traktora, mašina i transportnih vozila i predložene su mere za smanjenje i kontrolu sabijanja. Procenjene su štete nastale usled prekomernog sabijanja zemljišta od 250 do 300 USA$/ha godišnje. Predložene su nove metode i oprema za predviđanje vuče traktora na van putnim podlogama. Utvrđeni su uticajni faktori na potrošnju goriva i maziva i definisana je tehnologija za proizvodnju i korišćenje alternativnih goriva (biodizel i prirodni gas). Istraživana je pouzdanost traktora i mašina. Razvijene su nove ili poboljšane postojeće tehnologije i nova ili poboljšana tehnička rešenja u obradi zemljišta, setvi i sadnji, mehaničkoj i hemijskoj nezi, ubiranju, doradi i čuvanju poljoprivrednih proizvoda. Istražena je mogućnost primene metoda skeniranja, metoda konačnih elemenata, regresione analize, višekriterijumske optimizacije, fuzzy logike i neuronskih mreža, numeričke analize i drugih metoda u procesu proračuna, projektovanja i osvajanja novih rešenja poljoprivrednih mašina