Prohlížení Acta Polytechnica. 2014, vol. 54 dle názvu
Zobrazují se záznamy 38-57 z 73
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LABORATORY EQUIPMENT FOR AUTOTHERMAL REFORMING OF ORGANIC MATTER IN SUPERCRITICAL WATER
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)The ability of water to dissolve organic substances is very limited. However, its ability to dissolve them changes if pressure and temperature values reach the so-called critical point (p = 22.06MPa, T = 373.95 °C). Fluid ... -
LAPLACE-RUNGE-LENZ VECTOR IN QUANTUM MECHANICS IN NONCOMMUTATIVE SPACE
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)The object under scrutiny is the dynamical symmetry connected with conservation of the Laplace-Runge-Lenz vector (LRL) in the hydrogen atom problem solved by means of noncommutative quantum mechanics (NCQM). The considered ... -
LOCAL VELOCITY PROFILES MEASURED BY PIV IN AN VESSEL AGITATED BY RUSHTON TURBINE
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)The hydrodynamics and flow field were measured in an agitated vessel using 2-D Time Resolved Particle Image Velocimetry (2-D TR PIV). The experiments were carried out in a fully baffled cylindrical flat bottom vessel 300 ... -
LOW-MASS BINARY X-RAY SOURCES: MONITORING WITH VARIOUS SATELLITES
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)We show the importance of observing low-mass binary (LMXB) X-ray sources with the X-ray monitors onboard satellites. This enables us to study the physical processes governing the longterm activity of LMXBs. They are excellent ... -
NOx PREDICTION FOR FBC BOILERS USING EMPIRICAL MODELS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)Reliable prediction of NOx emissions can provide useful information for boiler design and fuel selection. Recently used kinetic prediction models for FBC boilers are overly complex and require large computing capacity. ... -
OBLIQUE MAGNETIC FIELDS AND THE ROLE OF FRAME DRAGGING NEAR ROTATING BLACK HOLE
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)Magnetic null points can develop near the ergosphere boundary of a rotating black hole by the combined effects of strong gravitational field and the frame-dragging mechanism. The induced electric component does not vanish ... -
ON OBSERVATIONAL PHENOMENA RELATED TO KERR SUPERSPINARS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)We investigate possible signatures of a Kerr naked singularity (superspinar) in various observational phenomena. It has been shown that Kerr naked singularities (superspinars) have to be efficiently converted to a black ... -
ON THE REAL MATRIX REPRESENTATION OF PT-SYMMETRIC OPERATORS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)We discuss the construction of real matrix representations of PT-symmetric operators. We show the limitation of a general recipe presented some time ago for non-Hermitian Hamiltonians with antiunitary symmetry and propose ... -
ON TWO WAYS TO LOOK FOR MUTUALLY UNBIASED BASES
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)Two equivalent ways of looking for mutually unbiased bases are discussed in this note. The passage from the search for d+1 mutually unbiased bases in Cd to the search for d(d+1) vectors in Cd2 satisfying constraint relations ... -
OPTIMIZING THE WELDING OF PLASTICS WITH THE USE OF DIFFERENTIAL SCANNING CALORIMETRY AND THERMOGRAVIMETRIC ANALYSIS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)Plastics have different thermal stability, depending on the structure of the polymer chains. It is therefore very important to know their thermal properties, which influence the temperature regime of processing equipment. ... -
PHOTOMETRIC ANALYSIS OF PI OF THE SKY DATA
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)Pi of the Sky is a system of two wide field of view robotic telescopes, which search for short timescale astrophysical phenomena, especially for prompt optical GRB emissions. The system was designed for autonomous operation, ... -
“PI OF THE SKY” OFF-LINE EXPERIMENT WITH GLORIA
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)GLORIA is the first free and open-access network of robotic telescopes in the world. Based on the Web 2.0 environment, amateur and professional users can do research in astronomy by observing with robotic telescope, and/or ... -
RESONANT SWITCH MODEL OF HF QPOS AND EQUATIONS OF STATE OF NEUTRON STARS AND QUARK STARS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)The mass and spin estimates of the 4U 1636−53 neutron star obtained by the Resonant Switch (RS) model of high-frequency quasi-periodic oscillations (HF QPOs) are tested by a large variety of equations of state (EoS) governing ... -
SEARCH FOR ISOLATED BLACK HOLES: PAST, PRESENT, FUTURE
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)The critical property of a black hole is the presence of an event horizon. It may be detected only by means of a detailed study of the emission features of its surroundings. The temporal resolution of such observations has ... -
SEGMENTING TAGGED CARDIAC MRI DATA USING A LOCAL VARIANCE FILTER
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)We present a new method for segmenting tagged MRI data. It is based on the observation that the tagging grid vanishes almost immediately inside the ventricles because of the blood flow. Segmentation can be therefore driven ... -
SEMICLASSICAL ASYMPTOTICS OF EIGENVALUES FOR NON-SELFADJOINT OPERATORS AND QUANTIZATION CONDITIONS ON RIEMANN SURFACES
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)This paper reports a study of the semiclassical asymptotic behavior of the eigenvalues of some nonself-adjoint operators that are important for applications. These operators are the Schrödinger operator with complex periodic ... -
SHAPE OF A NUCLEUS GROWING ON STRONGLY CURVED SURFACE OF A NANOFIBER
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)The equilibrium shape of a critical nucleus has strong impact on important parameters of nucleation theory, such as nucleation rate. While on the flat substrate the growing nucleus has a shape of a spherical cap, a shape ... -
SIZE ANALYSIS OF SOLID PARTICLES AT THE EXPERIMENTAL DEVICE FOR MULTI-STAGE BIOMASS COMBUSTION
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)This paper presents the results of an analysis of ash content particles produced in biomass combustion at an experimental device. The main parts of the device are: the water heater, the gasifying chamber, the air preheater, ... -
SPECIFIC EMISSIONS FROM BIOMASS COMBUSTION
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)This paper deals with determining the specific emissions from the combustion of two kinds of biomass fuels in a small-scale boiler. The tested fuels were pellets made of wood and pellets made of rape plant straw. In order ... -
STABILITY OF BOSE-EINSTEIN CONDENSATES IN A PT-SYMMETRIC DOUBLE-δ POTENTIAL CLOSE TO BRANCH POINTS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)A Bose-Einstein condensate trapped in a double-well potential, where atoms are incoupled to one side and extracted from the other, can in the mean-field limit be described by the nonlinear Gross-Pitaevskii equation (GPE) ...