Impurity pinning in transport through 1D Mott-Hubbard and spin gap insulators

A low energy crossover (see cond-mat/9711167) induced by Fermi liquid reservoirs in transport through a 1D Mott-Hubbard insulator of finite length $L$ is examined in the presence of impurity pinning. Under the assumption that the Hubbard gap 2M is large enough: $M > T_L \equiv v_c/L$ ($v_c$: charge velocity in the wire) and the impurity backscattering rate $\Gamma_1 \ll T_L$, the conductance vs. voltage/temperature displays a zero-energy resonance. Transport through a spin gapped 1D system is also described availing of duality between the backscattered current of this system and the direct current of the Mott-Hubbard insulator.Comment: 5 twocolumn pages in RevTex, no figure

Quantum critical behaviour of the plateau-insulator transition in the quantum Hall regime

High-field magnetotransport experiments provide an excellent tool to investigate the plateau-insulator phase transition in the integral quantum Hall effect. Here we review recent low-temperature high-field magnetotransport studies carried out on several InGaAs/InP heterostructures and an InGaAs/GaAs quantum well. We find that the longitudinal resistivity $\rho_{xx}$ near the critical filling factor $\nu_{c}$ ~ 0.5 follows the universal scaling law $\rho_{xx}(\nu, T) \propto exp[-\Delta \nu/(T/T_{0})^{\kappa}]$, where $\Delta \nu =\nu -\nu_{c}$. The critical exponent $\kappa$ equals $0.56 \pm 0.02$, which indicates that the plateau-insulator transition falls in a non-Fermi liquid universality class.Comment: 8 pages, accepted for publication in Proceedings of the Yamada Conference LX on Research in High Magnetic Fields (August 16-19, 2006, Sendai

ВИКОРИСТАННЯ ФАРМАКОКІНЕТИЧНИХ ПАРАМЕТРІВ З МЕТОЮ ПЛАНУВАННЯ РЕЖИМІВ ДОЗУВАННЯ ДЛЯ ЛІКАРСЬКИХ ПЛІВОК ПІД УМОВНОЮ НАЗВОЮ МЕТРО-ПЛІВКА

The developed method of "compression" of data of farmakokichnikh researches is with the use of odnokamernoy model. Farmakokichni researches of medical tapes which contain metronidazol are conducted. A high-quality evaluation is additionally conducted them farmakokichnikh paramtters with establishment of the optimum individual modes of dosage.Разработана методика «сжатия» данных фармакокинетических исследований с использованием однокамерной модели. Проведены фармакокинетические исследования лекарственных пленок, содержащих метронидазол. Дополнительно проведена качественная оценка их фармакокинетических параметров с установлением оптимальных индивидуальных режимов дозирования.Розроблена методика «стиснення» даних фармакокінетичних  досліджень з використанням однокамерної моделі. Проведені фармакокінетичні дослідження лікарських плівок, що містять метронідазол. Додатково проведено якісне оцінювання їх фармакокінетичних параметрів із встановленням оптимальних індивідуальних режимів дозування

ПРОФІЛАКТИЧНА СПРЯМОВАНІСТЬ ЯК ОСНОВНА СКЛАДОВА ПРОФЕСІЙНОЇ ДІЯЛЬНОСТІ МЕДИЧНОГО ПРАЦІВНИКА СЕРЕДНЬОЇ ЛАНКИ

The article deals with the problems of preservation of health and disease prevention inside the population, the role of training for nurses in sanitary and hygienic education and carrying out a preventive work to shape the future needs of medical worker in implementation of preventive measures and formation of healthy lifestyle.У статті розглянуто проблеми збереження здоров’я та попередження захворюваності серед населення, роль підготовки медичних сестер у санітарно-гігієнічному вихованні та проведенні профілактичної роботи з метою формування потреби майбутнього медичного працівника до проведення профілактичних заходів та формування здорового способу життя.

ФОРМУВАННЯ У СТУДЕНТІВ МЕДИЧНОГО КОЛЕДЖУ ЦІННІСНОГО СТАВЛЕННЯ ДО ВЛАСНОГО ЗДОРОВ’Я ЯК ОСНОВНА СКЛАДОВА ПІДГОТОВКИ ДО САНІТАРНО-ГІГІЄНІЧНОГО ВИХОВАННЯ ТА ПРОВЕДЕННЯ ПРОФІЛАКТИЧНОЇ РОБОТИ В СВОЇЙ МАЙБУТНІЙ ПРОФЕСІЙНІЙ ДІЯЛЬНОСТІ

The article deals with the problem of maintaining and formation of value attitude to the health in students of medical college as the main component of preparation for hygienic upbringing and conducting preventive work in their future careers.У статті розглянуто проблеми збереження та формування ціннісного ставлення до власного здоров’я у студентів медичного коледжу як основної складової підготовки до санітарно-гігієнічного виховання та проведення профілактичної роботи в своїй майбутній професійній діяльності

German Youth Language: Word-Formation Types of Suffix Nouns and Their Semantic Relations

The article is devoted to the study of word-formation types in modern German youth slang and a description of their systemic paradigmatic relations. The research material was a large group of suffix nouns, presented in the dictionaries of youth slang, as well as on youth literature sites. The suffix nouns formed by the word-formation type “producing basis + suffix” are analyzed in the article. The deep connections of motivating and motivated units are revealed, which reflect the logic of the connections of objects of reality in the linguistic consciousness, and the implementation of these relations in word-formation types is also traced. As a result of the analysis of word-formation meanings in the group of German nouns, which are youth slangisms constructed according to the “base + suffix” model, 4 main word-formation types were identified. The analysis proves that the thematic associations of the same word-formation type are in a variety of paradigmatic relationships, which at the lexical level are manifested in the form of synonymy, hypo- and hyperonymy, antonymy and polysemy. The word-formation types of suffix nouns studied in this work allowed to conclude that the intra-type and inter-type semantic relations are manifested most variably in the lexical-semantic field “Human designation”

Transport properties of single channel quantum wires with an impurity: Influence of finite length and temperature on average current and noise

The inhomogeneous Tomonaga Luttinger liquid model describing an interacting quantum wire adiabatically coupled to non-interacting leads is analyzed in the presence of a weak impurity within the wire. Due to strong electronic correlations in the wire, the effects of impurity backscattering, finite bias, finite temperature, and finite length lead to characteristic non-monotonic parameter dependencies of the average current. We discuss oscillations of the non-linear current voltage characteristics that arise due to reflections of plasmon modes at the impurity and quasi Andreev reflections at the contacts, and show how these oscillations are washed out by decoherence at finite temperature. Furthermore, the finite frequency current noise is investigated in detail. We find that the effective charge extracted in the shot noise regime in the weak backscattering limit decisively depends on the noise frequency $\omega$ relative to $v_F/gL$, where $v_F$ is the Fermi velocity, $g$ the Tomonaga Luttinger interaction parameter, and $L$ the length of the wire. The interplay of finite bias, finite temperature, and finite length yields rich structure in the noise spectrum which crucially depends on the electron-electron interaction. In particular, the excess noise, defined as the change of the noise due to the applied voltage, can become negative and is non-vanishing even for noise frequencies larger than the applied voltage, which are signatures of correlation effects.Comment: 28 pages, 19 figures, published version with minor change

Current Helicity and Twist as Two Indicators of The Mirror Asymmetry of solar Magnetic Fields

A comparison between the two tracers of magnetic field mirror asymmetry in solar active regions, twist and current helicity, is presented. It is shown that for individual active regions these tracers do not possess visible similarity while averaging by time over the solar cycle, or by latitude, reveals similarities in their behaviour. The main property of the dataset is anti-symmetry over the solar equator. Considering the evolution of helical properties over the solar cycle we find signatures of a possible sign change at the beginning of the cycle, though more systematic observational data are required for a definite confirmation. We discuss the role of both tracers in the context of the solar dynamo theory.Comment: 14 pages, 6 figure