Peculiarities of The Students’ Conceptual Structures and Basic Beliefs Correlation

The research is basically aimed at studying the students’ conceptual structure and basic beliefs being formed and correlated as well as at their classifying in accordance with the level of integration and coherence. The students’ conceptual structures and basic beliefs are analyzed in the article; special attention is paid to semantic, categoric and conceptual abilities coherence (homogeneity) and formedness. If speaking about methodology of the research, it includes theoretical and empirical methods. Theoretical, cluster and factor analyses as well as the Kruskal-Wallis rank sum test allowed us to define 5 clusters (groups) with low, medium-low, mean (average), high and extraordinary indices of the students’ conceptual structure and basic beliefs formedness. These clusters significantly differ at levels from p≤0.01 to p≤0.05. The students’ conceptual structure and basic beliefs correlations form the level systems classification characterized by different coherence of these levels. It is sufficient to conclude that different basic beliefs are the core of the students’ subjective inner world and are correlated with these beliefs conceptual structures specificity. The attained results prove the phenomenon of the intellectual resource “splitting”: the intellectual resource can split into productive and non-productive components in case of high-level intelligence, i.e. if the intelligence level is too high the intellectual resource and its basic components can be insufficiently formed and/or poorly developed

NMR and NQR parameters of ethanol crystal

Electric field gradients and chemical shielding tensors of the stable monoclinic crystal phase of ethanol are computed. The projector-augmented wave (PAW) and gauge-including projector-augmented wave (GIPAW) models in the periodic plane-wave density functional theory are used. The crystal data from X-ray measurements, as well as the structures where either all atomic, or only hydrogen atom positions are optimized in the density functional theory are analyzed. These structural models are also studied by including the semi-empirical Van der Waals correction to the density functional theory. Infrared spectra of these five crystal models are calculated

Melt homogenization and self-organization of chalcogenides glasses: evidence of sharp rigidity, stress and nanoscale phase separation transitions in the GexSe100-x binary

A Raman profiling method is used to monitor growth of GexSe100-x melts and reveals a two step process of homogenization. Resulting homogeneous glasses show the non-reversing enthalpy at Tg, {\Delta}Hnr(x), to show a square-well like variation with x, with a rigidity transition near xc(1) = 19.5(5)% and stress transition near xc(2) = 26.0(5)%) representing the boundaries of the rigid but stress-free Intermediate Phase (IP). The square-well like variation of {\Delta}Hnr(x) develops sloping walls, a triangular shape and eventually disappears in glasses having an increasing heterogeneity. The {\Delta}Hnr term ages over weeks outside the IP but not inside the IP. An optical analogue of the reversibility window is observed with Raman spectra of as-quenched melts and Tg cycled glasses being the same for glass compositions in the IP but different for compositions outside the IP. Variations of Molar volumes, display three regimes of behavior with a global minimum in the IP and a pronounced increase outside that phase. The intrinsic physical behavior of dry and homogeneous chalcogenides glasses can vary sharply with composition near elastic and chemical phase transitions, showing that the physics of network glasses requires homogeneous samples, and may be far more interesting than hitherto recognized

Measuring proton shift tensors with ultrafast MAS NMR

A new proton anisotropic-isotropic shift correlation experiment is described which operates with ultrafast MAS, resulting in good resolution of isotropic proton shifts in the detection dimension. The new experiment makes use of a recoupling sequence designed using symmetry principles which reintroduces the proton chemical shift anisotropy in the indirect dimension. The experiment has been used to measure the proton shift tensor parameters for the OH hydrogen-bonded protons in tyrosine.HCl and citric acid at Larmor frequencies of up to 850 MHz

The transport mechanism of the mitochondrial ADP/ATP carrier

The mitochondrial ADP/ATP carrier imports ADP from the cytosol and exports ATP from the mitochondrial matrix, which are key transport steps for oxidative phosphorylation in eukaryotic organisms. The transport protein belongs to the mitochondrial carrier family, a large transporter family in the inner membrane of mitochondria. It is one of the best studied members of the family and serves as a paradigm for the molecular mechanism of mitochondrial carriers. Structurally, the carrier consists of three homologous domains, each composed of two transmembrane α-helices linked with a loop and short α-helix on the matrix side. The transporter cycles between a cytoplasmic and matrix state in which a central substrate binding site is alternately accessible to these compartments for binding of ADP or ATP. On both the cytoplasmic and matrix side of the carrier are networks consisting of three salt bridges each. In the cytoplasmic state, the matrix salt bridge network is formed and the cytoplasmic network is disrupted, opening the central substrate binding site to the intermembrane space and cytosol, whereas the converse occurs in the matrix state. In the transport cycle, tighter substrate binding in the intermediate states allows the interconversion of conformations by lowering the energy barrier for disruption and formation of these networks, opening and closing the carrier to either side of the membrane in an alternating way. Conversion between cytoplasmic and matrix states might require the simultaneous rotation of three domains around a central translocation pathway, constituting a unique mechanism among transport proteins. This article is part of a Special Issue entitled: Mitochondrial Channels edited by Pierre Sonveaux, Pierre Maechler and Jean-Claude Martinou

In Situ NMR Spectroscopy of Supercapacitors: Insight into the Charge Storage Mechanism

Electrochemical capacitors, commonly known as supercapacitors, are important energy storage devices with high power capabilities and long cycle lives. Here we report the development and application of in situ nuclear magnetic resonance(NMR) methodologies to study changes at the electrode−electrolyte interface in working devices as they charge and discharge. For a supercapacitor comprising activated carbon electrodes and an organic electrolyte, NMR experiments carried out at different charge states allow quantification of the number of charge storing species and show that there are at least two distinct charge storage regimes. At cell voltages below 0.75 V, electrolyte anions are increasingly desorbed from the carbon micropores at the negative electrode, while at the positive electrode there is little change in the number of anions that are adsorbed as the voltage is increased. However, above a cell voltage of 0.75 V, dramatic increases in the amount of adsorbed anions in the positive electrode are observed while anions continue to be desorbed at the negative electrode. NMR experiments with simultaneous cyclic voltammetry show that supercapacitor charging causes marked changes to the local environments of charge storing species, with periodic changes of their chemical shift observed. NMR calculations on a model carbon fragment show that the addition and removal of electrons from a delocalized system should lead to considerable increases in the nucleus-independent chemical shift of nearby species, in agreement with our experimental observations

Peculiarities of The Students’ Conceptual Structures and Basic Beliefs Correlation

The research is basically aimed at studying the students’ conceptual structure and basic beliefs being formed and correlated as well as at their classifying in accordance with the level of integration and coherence. The students’ conceptual structures and basic beliefs are analyzed in the article; special attention is paid to semantic, categoric and conceptual abilities coherence (homogeneity) and formedness. If speaking about methodology of the research, it includes theoretical and empirical methods. Theoretical, cluster and factor analyses as well as the Kruskal-Wallis rank sum test allowed us to define 5 clusters (groups) with low, medium-low, mean (average), high and extraordinary indices of the students’ conceptual structure and basic beliefs formedness. These clusters significantly differ at levels from p≤0.01 to p≤0.05. The students’ conceptual structure and basic beliefs correlations form the level systems classification characterized by different coherence of these levels. It is sufficient to conclude that different basic beliefs are the core of the students’ subjective inner world and are correlated with these beliefs conceptual structures specificity. The attained results prove the phenomenon of the intellectual resource “splitting”: the intellectual resource can split into productive and non-productive components in case of high-level intelligence, i.e. if the intelligence level is too high the intellectual resource and its basic components can be insufficiently formed and/or poorly developed

Applications of first principles NMR calculations

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