Влияние компонентов технологической среды на спектральные характеристики оттисков

Розроблено модельні зразки сучасних фарб, до складу яких введено добавки для стабілізації кольоровідтворення. Визначено вплив добавок на спектральні характеристики відбитків та ступінь забруднення фарби.A model sample of modern printing inks with additives for stabilize the color reproduction are established. The influence of additives on the spectral characteristics of imprints and degree of ink’s contamination are defined.Разработаны модельные образцы современных красок, в состав которых введены добавки для стабилизации цветовоспроизведения. Определено влияние добавок на спектральные характеристики оттисков и степень загрязнения краски

Re-entrant resonant tunneling

We study the effect of electron-electron interactions on the resonant-tunneling spectroscopy of the localized states in a barrier. Using a simple model of three localized states, we show that, due to the Coulomb interactions, a single state can give rise to two resonant peaks in the conductance as a function of gate voltage, G(Vg). We also demonstrate that an additional higher-order resonance with Vg-position in between these two peaks becomes possibile when interactions are taken into account. The corresponding resonant-tunneling process involves two-electron transitions. We have observed both these effects in GaAs transistor microstructures by studying the time evolution of three adjacent G(Vg) peaks caused by fluctuating occupation of an isolated impurity (modulator). The heights of the two stronger peaks exibit in-phase fluctuations. The phase of fluctuations of the smaller middle peak is opposite. The two stronger peaks have their origin in the same localized state, and the third one corresponds to a co-tunneling process.Comment: 9 pages, REVTeX, 4 figure

Quantum transport thermometry for electrons in graphene

We propose a method of measuring the electron temperature $T_e$ in mesoscopic conductors and demonstrate experimentally its applicability to micron-size graphene devices in the linear-response regime ($T_e\approx T$, the bath temperature). The method can be {especially useful} in case of overheating, $T_e>T$. It is based on analysis of the correlation function of mesoscopic conductance fluctuations. Although the fluctuation amplitude strongly depends on the details of electron scattering in graphene, we show that $T_e$ extracted from the correlation function is insensitive to these details.Comment: 4 pages, 4 figures; final version, as publishe

Влияние технологических режимов печати на закрепление краски на пластиковых карточках

На підставі експериментальних досліджень визначено умови закріплення фарби на ПВХ-пластику.The terms of ink-fixing on the vinyl chloride polymer plastics are determined on the basis of experimental researches.На основании экспериментальных исследований определены условия закрепления краски на ПВХ-пластике

Metabolic mechanisms of chemiluminescent activity of neutrophilic granulocytes in qualified athletes

The high exercise stress in sport causes the decrease of immune cells reactivity. Studying the interrelation between hemiluminscent activity of neutrophylic granulocytes and NAD(P)-depending dehydrogenases in athletes is important for better understanding of sport immunodeficiency metabolic mechanisms and researching the methods for its correction. 51 male athletes of 22,1 ± 3,7 y. o. and 64 healthy males of the same age as the reference group were participated in the study. We found that metabolic resources providing the intensity of respiratory burst depend on mitochondrial processes condition and lipid metabolism. The activation index has logarithmic dependence on NAD(P)-MDH, NAD-MDH, NAD-IDH activities. Therefore the functional activity of neutrophilic granulocytes in athletes has positive correlation with plastic exchange level and negative correlation with oxygen-depended ATP production

A dynamic localization of 2D electrons at mesoscopic length scales

We have investigated the local magneto-transport in high-quality 2D electron systems at low carrier densities. The positive magneto-resistance in perpendicular magnetic field in the strongly insulating regime has been measured to evaluate the spatial concentration of localized states within a mesoscopic region of the samples. An independent measurement of the electron density within the same region shows an unexpected correspondence between the density of electrons in the metallic regime and that of the localized states in the insulating phase. We have argued that this correspondence manifests a rigid distribution of electrons at low densities.Comment: 8 pages (incl 4 figures), double colum

Enhanced fluctuations of the tunneling density of states near bottoms of Landau bands measured by a local spectrometer

We have found that the local density of states fluctuations (LDOSF) in a disordered metal, detected using an impurity in the barrier as a spectrometer, undergo enhanced (with respect to SdH and dHvA effects) oscillations in strong magnetic fields, omega _c\tau > 1. We attribute this to the dominant role of the states near bottoms of Landau bands which give the major contribution to the LDOSF and are most strongly affected by disorder. We also demonstrate that in intermediate fields the LDOSF increase with B in accordance with the results obtained in the diffusion approximation.Comment: 4 pages, 4 figure

Spontaneous current generation in gated nanostructures

We have observed an unusual dc current spontaneously generated in the conducting channel of a short-gated GaAs transistor. The magnitude and direction of this current critically depend upon the voltage applied to the gate. We propose that it is initiated by the injection of hot electrons from the gate that relax via phonon emission. The phonons then excite secondary electrons from asymmetrically distributed impurities in the channel, which leads to the observed current