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Sankryžos Pinavia taikymai Vilniuje
No full textĮvairiose Vilniaus sankryžose modeliuojama naujos S.Buteliausko išrastos sankryžos diegimo galimybėĮvairiose Vilniaus sankryžose modeliuojama naujos S.Buteliausko išrastos sankryžos diegimo galimyb
5 didieji faktoriai
No full textPenki didieji asmenybės faktoriai taikomi įvairiose mokslinėse srityse. Analizuojant pasaulinę literatūrą, buvo
pastebėta, kad asmenybės bruožų teorija vis dažniau taikoma ryšiams su įvairiais veiksniais tirti ir paaiškinti. Šiame straipsnyje
pateikiami ir trumpai aprašomi penkių didžiųjų faktorių nustatymo metodai. Taip pat analizuojamas penkių didžiųjų asmenybės
faktorių taikymas personalo atrankai. Nagrinėjami moksliniai tyrimai, kuriuose pateikiamas šių faktorių ryšys su tokiais veiksniais kaip darbo našumas, akademiniai pasiekimai ir studentų žinių valdymas bei vertinimas
Įsėlių įtaka dirvos drėgmei
No full textLauko eksperimentas vykdytas Aleksandro Stulginskio Universiteto bandymų stotyje 2009 -2011 metais. Auginti kukurūzai, o jų tarpueiliuose skirtingi įsėliniai tarpiniai. augalai. Eksperimentas vykdytas 4 pakartojimais. Tirta įsėlių įtaka dirvos drėgmei
Analysis of Interdependencies Between Students’ Emotions, Learning Productivity, Academic Achievements and Physiological Parameters
No full textA suffiient amount of studies worldwide prove an interrelation linking students’ learning productivity, interest in
learning, emotional and psychological state to physiological parameters. Emotional states and the interest in learning affect learning productivity, while physiological parameters demonstrate such changes. Different authors‘ research results are discussed
and systematized in this article. The article analyses how positive and negative emotions affect learning productivity and which
physiological parameters have to be discussed to estimate students‘ productivity. After indentifying interrelations between
these above mentioned parameters, their analysis could be used to improve students‘ academic achievementsA suffiient amount of studies worldwide prove an interrelation linking students’ learning productivity, interest in
learning, emotional and psychological state to physiological parameters. Emotional states and the interest in learning affect learning productivity, while physiological parameters demonstrate such changes. Different authors‘ research results are discussed
and systematized in this article. The article analyses how positive and negative emotions affect learning productivity and which
physiological parameters have to be discussed to estimate students‘ productivity. After indentifying interrelations between
these above mentioned parameters, their analysis could be used to improve students‘ academic achievement
Energy Security Level Investigation after Ignalina NPP Shutdown
No full textTyrime Ignalinos atominės elektrinės (AE) uždarymo įtaka Lietuvos energetiniam saugumui. Darbe pateikiama energetinio saugumo indikatorių sistema, apimanti techninius, ekonominius ir sociopolitinius aspektus.The work presents the investigation of the impact of Ignalina Nuclear Power Plant (NPP) shutdown on Lithuanian energy security. The system of energy security indicators, covering technical, economic and socio-political aspects is presented. The integral characteristic of these indicators shows the level of energy security. The work analyses the Lithuanian energy security level in 2007. To make a comparison, the energy security level in 2010, after the shutdown of Ignalina NPP, when
Lithuanian Power Plant in Elektrėnai becomes the main electricity producer, is forecasted
Resonance Raman Spectra and Electronic Transitions in Carotenoids: A Density Functional Theory Study
No full textoai:oai.midas.lt:midas/785b739e-511c-4432-b77b-90660a7fc0c8Raman and electronic absorption spectra corresponding to the S0–S2 electronic transition of various carotenoid and polyene molecules are theoretically analyzed using the density functional theory (DFT) approach. The results demonstrate the linear dependence between the frequency of the so-called ν1 band corresponding to the C═C stretching modes in the Raman spectra and the S0–S2 electronic transition for molecules of different conjugation lengths. From these calculations the following relationship have been identified: (i) the effective conjugation length shortens in conformers of carotenoids containing β-rings whereas it increases in polyene upon s-cis isomerization at their ends, (ii) methyl groups connected to the conjugated chain of carotenoids induce a splitting of the ν1 band in the Raman spectra, (iii) the effective conjugation lengths of all-trans-polyenes and corresponding all-trans-carotenoids are the same as follows from the Raman ν1 frequency, but they are different as defined from S0–S2 electronic transition energies. The results well correlate with the experimental observations.
http://dx.doi.org/10.1021/jp406449cRaman and electronic absorption spectra corresponding to the S0–S2 electronic transition of various carotenoid and polyene molecules are theoretically analyzed using the density functional theory (DFT) approach. The results demonstrate the linear dependence between the frequency of the so-called ν1 band corresponding to the C═C stretching modes in the Raman spectra and the S0–S2 electronic transition for molecules of different conjugation lengths. From these calculations the following relationship have been identified: (i) the effective conjugation length shortens in conformers of carotenoids containing β-rings whereas it increases in polyene upon s-cis isomerization at their ends, (ii) methyl groups connected to the conjugated chain of carotenoids induce a splitting of the ν1 band in the Raman spectra, (iii) the effective conjugation lengths of all-trans-polyenes and corresponding all-trans-carotenoids are the same as follows from the Raman ν1 frequency, but they are different as defined from S0–S2 electronic transition energies. The results well correlate with the experimental observations.
http://dx.doi.org/10.1021/jp406449
Resonance Raman Spectra of Carotenoid Molecules: Influence of Methyl Substitutions
No full textWe report here the resonance Raman spectra and the quantum
chemical calculations of the Raman spectra for β-carotene and 13,13′-
diphenyl-β-carotene. The first aim of this approach was to test the robustness
of the method used for modeling β-carotene, and assess whether it could
accurately predict the vibrational properties of derivatives in which conjugated
substituents had been introduced. DFT calculations, using the B3LYP functional
in combination with the 6-311G(d,p) basis set, were able to accurately
predict the influence of two phenyl substituents connected to the β-carotene
molecule, although these deeply perturb the vibrational modes. This experimentally
validated modeling technique leads to a fine understanding of the
origin of the carotenoid resonance Raman bands, which are widely used for
assessing the properties of these molecules, and in particular in complex
media, such as binding sites provided by biological macromolecules.We report here the resonance Raman spectra and the quantum
chemical calculations of the Raman spectra for β-carotene and 13,13′-
diphenyl-β-carotene. The first aim of this approach was to test the robustness
of the method used for modeling β-carotene, and assess whether it could
accurately predict the vibrational properties of derivatives in which conjugated
substituents had been introduced. DFT calculations, using the B3LYP functional
in combination with the 6-311G(d,p) basis set, were able to accurately
predict the influence of two phenyl substituents connected to the β-carotene
molecule, although these deeply perturb the vibrational modes. This experimentally
validated modeling technique leads to a fine understanding of the
origin of the carotenoid resonance Raman bands, which are widely used for
assessing the properties of these molecules, and in particular in complex
media, such as binding sites provided by biological macromolecules