Mixtures of the Biologically Active Substances as Model Systems for Animal Blood Diagnostics

There are numerous biochemical and physical methods for agrobio- and nanomedical sciences. The real-time interfacial tension (RTIT) of various liquids is a powerful analytical method. The main aims of the present work are the following: to study the parameters of the RTIT of the mixtures based on some proteins, lipids, salts as the model systems for animal blood diagnostics. The greatest differences in the RTIT values observed at different concentrations for the aqueous dispersions: albumin: lipid: salt “at the short time of existence of the surface”. The high salt concentrations have some particular effects on RTIT values for these mixtures at all times. The changes in albumin concentration influence all RTIT values, but the changes in lipid concentration have insignificant influence and only “at the long time of existence of the surface”. Such data have high importance both for fundamental studies and for possible applications in animal and human medicine

Розрахунок схеми електронного навантаження для тестування низьковольтних джерел

Purpose. The introduction of electronic load for testing high-precision low-voltage sources (solar panels) requires careful review not only of the circuit design, but also thermal and mechanical design. The article considers the principle of creating and calculating the optimal solution for the implementation of electronic load. Methodology. To achieve this goal, methods of analysis of modern electronic database, calculations of basic physical and electrical parameters and their modeling are used. Findings. Based on the considered physical and circuit solutions for the implementation of the electronic load unit, a corresponding electrical circuit was developed. The transistors are controlled by four unipolar operational amplifiers integrated into the LM324 chip. Control of the electronic load unit is implemented by controlling the voltage at the positive feedback terminals, which is further stabilized by the TL431 chip. The device is powered by a source of DC stabilized current of 12 V (provides additional filtering from voltage fluctuations). Originality. Modern advances in the development of solar cells and other low-voltage energy sources have led to the need to create compact and express systems for testing them, which cannot be implemented on existing solutions. Practical value. Adherence to the indications and principles set out in this article will provide the load with the ability to work at high power, while maintaining good performance and reliability. The developed scheme allows to create a compass device for express testing of solar panels.Цель работы. Внедрение электронной нагрузки для испытания высокоточных низковольтных источников (солнечных батарей) требует тщательного просмотра не только схемотехнической конструкции, но и теплотехнической и механической конструкции. В статье рассматривается принцип создания и расчета оптимального решения для реализации электронной нагрузки. Методы исследования. Для достижения цели используются методы анализа современной электронной базы, расчет основных физических и электрических параметров и их моделирование. Полученные результаты. На основе рассмотренных физико-схемных решений для реализации электронного блока нагрузки была разработана соответствующая электрическая схема. Транзисторы управляются четырьмя униполярными операционными усилителями, интегрированными в микросхему LM324. Управление электронным блоком нагрузки реализуется путем управления напряжением на клеммах положительной обратной связи, дополнительно стабилизируемой микросхемой TL431. Устройство питается от источника постоянного стабилизированного тока напряжением 12 В (обеспечивает дополнительную фильтрацию от колебаний напряжения). Научна новизна. Современные достижения в разработке солнечных элементов и других низковольтных источников энергии привели к необходимости создания компактных и экспрессных систем их тестирования, которые нельзя реализовать на существующих решениях. Практическая ценность. Соблюдение показаний и принципов, изложенных в этой статье, обеспечит нагрузке возможность работать на большой мощности, и при этом сохранить хорошие характеристики и надежность. Разработанная схема позволяет создать компасное устройство для экспрессного тестирования солнечных батарей.Мета роботи. Впровадження електронного навантаження для випробування високоточних низьковольтних джерел (сонячних батарей) вимагає ретельного перегляду не тільки схемотехнічної конструкції, а й теплотехнічної та механічної конструкції. У статті розглядається принцип створення та розрахунку оптимального рішення для реалізації електронного навантаження. Методологія. Для досягнення мети використовуються методи аналіза сучасної електронної бази, розрахунки основних фізичних та електричних параметрів та їх моделювання. Висновки. На основі розглянутих фізико-схемних рішень для реалізації електронного блоку навантаження була розроблена відповідна електрична схема. Транзистори керуються чотирма уніполярними операційними підсилювачами, інтегрованими в мікросхему LM324. Управління електронним блоком навантаження реалізується шляхом управління напругою на клемах позитивного зворотного зв'язку, яка додатково стабілізується мікросхемою TL431. Пристрій живиться від джерела постійного стабілізованого струму напругою 12 В (забезпечує додаткову фільтрацію від коливань напруги). Оригінальність.  Сучасні досягнення у розробці сонячних елементів та інших низьковольтних джерел енергії призвели до необхідності створення компактних та експресних систем їх тестування, котрі не можна реалізувати на існуючих рішеннях. Практичне значення. Дотримання показань і принципів, які викладені в цій статті, забезпечить навантаженню можливість працювати на великій потужності, і при цьому зберегти хороші характеристики і надійність. Розроблена схема дозволяє створити компасний пристрій експресного тестування сонячних батарей

A Diagrammatic Theory of Random Scattering Matrices for Normal-Superconducting Mesoscopic Junctions

The planar-diagrammatic technique of large-$N$ random matrices is extended to evaluate averages over the circular ensemble of unitary matrices. It is then applied to study transport through a disordered metallic ``grain'', attached through ideal leads to a normal electrode and to a superconducting electrode. The latter enforces boundary conditions which coherently couple electrons and holes at the Fermi energy through Andreev scattering. Consequently, the {\it leading order} of the conductance is altered, and thus changes much larger than $e^2/h$ are observed when, e.g., a weak magnetic field is applied. This is in agreement with existing theories. The approach developed here is intermediate between the theory of dirty superconductors (the Usadel equations) and the random-matrix approach involving transmission eigenvalues (e.g. the DMPK equation) in the following sense: even though one starts from a scattering formalism, a quantity analogous to the superconducting order-parameter within the system naturally arises. The method can be applied to a variety of mesoscopic normal-superconducting structures, but for brevity we consider here only the case of a simple disordered N-S junction.Comment: 39 pages + 9 postscript figure

Global well-posedness for the KP-I equation on the background of a non localized solution

We prove that the Cauchy problem for the KP-I equation is globally well-posed for initial data which are localized perturbations (of arbitrary size) of a non-localized (i.e. not decaying in all directions) traveling wave solution (e.g. the KdV line solitary wave or the Zaitsev solitary waves which are localized in $x$ and $y$ periodic or conversely)

Hadron Energy Reconstruction for the ATLAS Calorimetry in the Framework of the Non-parametrical Method

This paper discusses hadron energy reconstruction for the ATLAS barrel prototype combined calorimeter (consisting of a lead-liquid argon electromagnetic part and an iron-scintillator hadronic part) in the framework of the non-parametrical method. The non-parametrical method utilizes only the known $e/h$ ratios and the electron calibration constants and does not require the determination of any parameters by a minimization technique. Thus, this technique lends itself to an easy use in a first level trigger. The reconstructed mean values of the hadron energies are within $\pm 1$ of the true values and the fractional energy resolution is $[(58\pm3)/\sqrt{E}+(2.5\pm0.3)$. The value of the $e/h$ ratio obtained for the electromagnetic compartment of the combined calorimeter is $1.74\pm0.04$ and agrees with the prediction that $e/h > 1.7$ for this electromagnetic calorimeter. Results of a study of the longitudinal hadronic shower development are also presented. The data have been taken in the H8 beam line of the CERN SPS using pions of energies from 10 to 300 GeV.Comment: 33 pages, 13 figures, Will be published in NIM

Search for composite and exotic fermions at LEP 2

A search for unstable heavy fermions with the DELPHI detector at LEP is reported. Sequential and non-canonical leptons, as well as excited leptons and quarks, are considered. The data analysed correspond to an integrated luminosity of about 48 pb^{-1} at an e^+e^- centre-of-mass energy of 183 GeV and about 20 pb^{-1} equally shared between the centre-of-mass energies of 172 GeV and 161 GeV. The search for pair-produced new leptons establishes 95% confidence level mass limits in the region between 70 GeV/c^2 and 90 GeV/c^2, depending on the channel. The search for singly produced excited leptons and quarks establishes upper limits on the ratio of the coupling of the excited fermio

Search for lightest neutralino and stau pair production in light gravitino scenarios with stau NLSP

Promptly decaying lightest neutralinos and long-lived staus are searched for in the context of light gravitino scenarios. It is assumed that the stau is the next to lightest supersymmetric particle (NLSP) and that the lightest neutralino is the next to NLSP (NNLSP). Data collected with the Delphi detector at centre-of-mass energies from 161 to 183 \GeV are analysed. No evidence of the production of these particles is found. Hence, lower mass limits for both kinds of particles are set at 95% C.L.. The mass of gaugino-like neutralinos is found to be greater than 71.5 GeV/c^2. In the search for long-lived stau, masses less than 70.0 to 77.5 \GeVcc are excluded for gravitino masses from 10 to 150 \eVcc . Combining this search with the searches for stable heavy leptons and Minimal Supersymmetric Standard Model staus a lower limit of 68.5 \GeVcc may be set for the stau mas

Search for direct production of charginos and neutralinos in events with three leptons and missing transverse momentum in √s = 7 TeV pp collisions with the ATLAS detector

A search for the direct production of charginos and neutralinos in final states with three electrons or muons and missing transverse momentum is presented. The analysis is based on 4.7 fb−1 of proton–proton collision data delivered by the Large Hadron Collider and recorded with the ATLAS detector. Observations are consistent with Standard Model expectations in three signal regions that are either depleted or enriched in Z-boson decays. Upper limits at 95% confidence level are set in R-parity conserving phenomenological minimal supersymmetric models and in simplified models, significantly extending previous results

Jet size dependence of single jet suppression in lead-lead collisions at sqrt(s(NN)) = 2.76 TeV with the ATLAS detector at the LHC

Measurements of inclusive jet suppression in heavy ion collisions at the LHC provide direct sensitivity to the physics of jet quenching. In a sample of lead-lead collisions at sqrt(s) = 2.76 TeV corresponding to an integrated luminosity of approximately 7 inverse microbarns, ATLAS has measured jets with a calorimeter over the pseudorapidity interval |eta| < 2.1 and over the transverse momentum range 38 < pT < 210 GeV. Jets were reconstructed using the anti-kt algorithm with values for the distance parameter that determines the nominal jet radius of R = 0.2, 0.3, 0.4 and 0.5. The centrality dependence of the jet yield is characterized by the jet "central-to-peripheral ratio," Rcp. Jet production is found to be suppressed by approximately a factor of two in the 10% most central collisions relative to peripheral collisions. Rcp varies smoothly with centrality as characterized by the number of participating nucleons. The observed suppression is only weakly dependent on jet radius and transverse momentum. These results provide the first direct measurement of inclusive jet suppression in heavy ion collisions and complement previous measurements of dijet transverse energy imbalance at the LHC.Comment: 15 pages plus author list (30 pages total), 8 figures, 2 tables, submitted to Physics Letters B. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2011-02

Measurement of the polarisation of W bosons produced with large transverse momentum in pp collisions at sqrt(s) = 7 TeV with the ATLAS experiment

This paper describes an analysis of the angular distribution of W->enu and W->munu decays, using data from pp collisions at sqrt(s) = 7 TeV recorded with the ATLAS detector at the LHC in 2010, corresponding to an integrated luminosity of about 35 pb^-1. Using the decay lepton transverse momentum and the missing transverse energy, the W decay angular distribution projected onto the transverse plane is obtained and analysed in terms of helicity fractions f0, fL and fR over two ranges of W transverse momentum (ptw): 35 < ptw < 50 GeV and ptw > 50 GeV. Good agreement is found with theoretical predictions. For ptw > 50 GeV, the values of f0 and fL-fR, averaged over charge and lepton flavour, are measured to be : f0 = 0.127 +/- 0.030 +/- 0.108 and fL-fR = 0.252 +/- 0.017 +/- 0.030, where the first uncertainties are statistical, and the second include all systematic effects.Comment: 19 pages plus author list (34 pages total), 9 figures, 11 tables, revised author list, matches European Journal of Physics C versio