Prohlížení Acta Polytechnica. 2014, vol. 54 dle názvu
Zobrazují se záznamy 1-20 z 73
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A BOSE-EINSTEIN CONDENSATE WITH PT-SYMMETRIC DOUBLE-DELTA FUNCTION LOSS AND GAIN IN A HARMONIC TRAP: A TEST OF RIGOROUS ESTIMATES
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)We consider the linear and nonlinear Schrödinger equation for a Bose-Einstein condensate in a harmonic trap with PT-symmetric double-delta function loss and gain terms. We verify that the conditions for the applicability ... -
A COMPARISON OF METHODS USING STRAIN GAUGES TO MONITOR PHYSIOLOGICAL MOVEMENTS ON A HOSPITAL BED
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)Two methods which are suitable to monitor the small movements of the patient in a horizontal position on the bed are compared. The methods use sensors based on strain gauge bridges configured to measure the torsion deformation ... -
A DIFFERENTIAL INTEGRABILITY CONDITION FOR TWO-DIMENSIONAL HAMILTONIAN SYSTEMS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)We review, restate, and prove a result due to Kaushal and Korsch [Phys. Lett. A 276, 47 (2000)] on the complete integrability of two-dimensional Hamiltonian systems whose Hamiltonian satisfies a set of four linear second ... -
A MYOELECTRIC PROSTHETIC ARM CONTROLLED BY A SENSOR-ACTUATOR LOOP
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)This paper describes new methods and systems designed for application in upper extremity prostheses. An artificial upper limb with this system is a robot arm controlled by EMG signals and a set of sensors. The new multi-sensor ... -
A SIMPLE DERIVATION OF FINITE-TEMPERATURE CFT CORRELATORS FROM THE BTZ BLACK HOLE
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)We present a simple Lie-algebraic approach to momentum-space two-point functions of two-dimensional conformal field theory at finite temperature dual to the BTZ black hole. Making use of the real-time prescription of AdS/CFT ... -
ALTERNATIVE SELECTION FUNCTIONS FOR INFORMATION SET MONTE CARLO TREE SEARCH
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)We evaluate the performance of various selection methods for the Monte Carlo Tree Search algorithm in two-player zero-sum extensive-form games with imperfect information. We compare the standard Upper Confident Bounds ... -
ANALYSIS OF PARAMETERS AFFECTING THE QUALITY OF A CUTTING MACHINE
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)The quality of cutting machines is affected by several factors that can be directly or indirectly influenced by manufacturers, technicians and users of machine tools. The most critical qualitative evaluation parameters of ... -
ANNEALING OF POLYCRYSTALLINE THIN FILM SILICON SOLAR CELLS IN WATER VAPOUR AT SUB-ATMOSPHERIC PRESSURES
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)Thin film polycrystalline silicon (poly-Si) solar cells were annealed in water vapour at pressures below atmospheric pressure. PN junction of the sample was contacted by measuring probes directly in the pressure chamber ... -
AUTOMATIC BIOMASS BOILER WITH AN EXTERNAL THERMOELECTRIC GENERATOR
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)This paper presents the design and test results of an external thermoelectric generator that utilizes the waste heat from a small-scale domestic biomass boiler with nominal rated heat output of 25 kW. The low-temperature ... -
AUTOMORPHISMS OF ALGEBRAS AND ORTHOGONAL POLYNOMIALS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)Suitable automorphisms together with complete classification of representations of some algebras can be used to generate some sets of orthogonal polynomials “at no cost”. This is also the case of nonstandard Klimyk-Gavrilik ... -
BEYOND THE STANDARD MODEL OF THE DISC–LINE SPECTRAL PROFILES FROM BLACK HOLE ACCRETION DISCS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)The strong gravitational field of a black hole has distinct effects on the observed profile of a spectral line from an accretion disc near a black hole. The observed profile of the spectral line is broadened and skewed by ... -
CAN ONE REALLY STUDY CHAOS ANALYTICALLY?
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)One generally thinks that chaos can be studied only numerically by aid of the computer. It is however suggested by the theorem of Sharkovskii and Li and Yorke that in Id continuous maps analytical studies are possible. How ... -
COMPARATIVE MEASUREMENTS OF HEAD ANGULAR MOVEMENTS USING A CAMERA SYSTEM AND A GYROSCOPE SYSTEM
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)Assessments of body-segment angular movements are very important in the rehabilitation process. Head angular movements are measured and analyzed for use in studies of stability and posture. However, there is no methodology ... -
COMPUTATIONAL AERODYNAMIC OPTIMIZATION OF LOW-SPEED WING
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)An optimization method consisting of genetic and evolution optimization algorithm and a solver using nonlinear aerodynamics was applied on design of low-speed wing. Geometric parameterization of wing uses standard geometric ... -
CURRENT WAYS TO HARVEST ENERGY USING A COMPUTER MOUSE
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)This paper deals with the idea of an energy harvesting (EH) system that uses the mechanical energy from finger presses on the buttons of a computer mouse by means of a piezomaterial (PVF2). The piezomaterial is placed in ... -
DEPOSITION CARBON NANOSTRUCTURES BY SURFATRON GENERATED DISCHARGE
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)Carbon nanostructures were deposited by surface wave discharge using various Ar/CH4/ CO2 gas mixture ratios. The morphology was controlled by adjusting of gas concentration and was investigated by scanning electron microscopy ... -
DESIGN THEORY FOR THE PRESSING CHAMBER IN THE SOLID BIOFUEL PRODUCTION PROCESS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)The quality of a high-grade solid biofuel depends on many factors, which can be divided into three main groups - material, technological and structural. The main focus of this paper is on observing the influence of structural ... -
DIRAC AND HAMILTON
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)Dirac devised his theory of Quantum Mechanics and recognised that his operators resembled the canonical coordinates of Hamiltonian Mechanics. This gave the latter a new lease of life. We look at what happens to Dirac’s ... -
DISTINGUISHING BETWEEN SPOT AND TORUS MODELS OF HIGH-FREQUENCY QUASIPERIODIC OSCILLATIONS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)In the context of high-frequency quasi-periodic oscillation (HF QPOs) we further explore the appearance of an observable signal generated by hot spots moving along quasi-elliptic trajectories close to the innermost stable ... -
EFFECTIVE FRACTURE ENERGY OF ULTRA-HIGH-PERFORMANCE FIBRE-REINFORCED CONCRETE UNDER INCREASED STRAIN RATES
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)The main objective of this paper is to contribute to the development of ultra-high performance fibre reinforced concrete (UHPFRC) with respect to its effective fracture energy. Effective fracture energy was investigated ...