Browsing Acta Polytechnica by Title
Now showing items 775-794 of 880
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THE COUPLED-CLUSTER APPROACH TO QUANTUM MANY-BODY PROBLEM IN A THREE-HILBERT-SPACE REINTERPRETATION
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)The quantum many-body bound-state problem in its computationally successful coupled cluster method (CCM) representation is reconsidered. In conventional practice one factorizes the groundstate wave functions |Ψ) = eS |Φ) ... -
The Czech Contribution to Future Large X-Ray Astronomy Telescopes: Recent Progress
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)We briefly review the recent status of the Czech contribution to future space X-ray astronomy missions with emphasis on the development of new technologies and test samples of X-ray mirrors with precise surfaces based on ... -
THE DEVELOPMENT OF A NEW ADSORPTION-DESORPTION DEVICE
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)The aim of this work was to construct a new adsorption-desorption device based on the principle of separation of volatile organic compounds, e.g., ethanol. As an adsorbent, it is possible to use granulated activated carbon ... -
THE DISCOVERY OF THE CHANDRASEKHAR MASS AND THE CHANDRASEKHAR-EDDINGTON CONTROVERSY
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)The so called Chandrasekhar limiting mass is a a quantum mechanical relativistic effect. The discovery and establishment of the concept involved a major controversy between the young Chandrasekhar and the hilarious Eddington. ... -
THE EFFECT OF ADDING HYDROGEN ON THE PERFORMANCE AND THE CYCLIC VARIABILITY OF A SPARK IGNITION ENGINE POWERED BY NATURAL GAS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)This paper deals with the influence of blending hydrogen (from 0 to 50% vol.) on the parameters and the cyclic variability of a Lombardini LGW702 combustion engine powered by natural gas. The experimental measurements were ... -
The effect of ambient temperature on the delay time of perimeter protection
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)Perimeter security defines the private space from the public space and also serves as the first barrier between the intruder and the protected interest. Delay time is one of the input parameters used in a quantitative ... -
THE EFFECT OF DIFFERENT FORMS OF OXYGEN ON PROPERTIES OF BETA TITANIUM ALLOYS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)The beta-titanium alloys are widely used in many applications (medicine, aerospace industry etc.) due to their superior properties, such as corrosion resistance, biocompatibility and high strength to weight ratio. One of ... -
The Effect of Kaolin Concentration on Flock Growth Kinetics in an Agitated Tank
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)This paper reports on an investigation of the effect of initial solid particle concentrationon flock growth and flock shape characterized by the fractal dimension Df2. The experiments werecarried out in a baffled tank ... -
THE EFFECT OF SOIL GRAIN SIZE ON THE DEFORMATION PROPERTIES OF REINFORCED GEOCELL LAYERS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)The effect of backfill material grading on the behaviour of geocell reinforced layers was experimentally investigated in this study. A series of loading tests were performed on a model with geocell reinforced and unreinforced ... -
The Effect of Strain Rate on the Mechanical Properties of Automotive Steel Sheets
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)The automotive industry is currently seeking detailed information about various types of materials and their behavior under dynamic loading. Dynamic tensile testing of sheet steels is growing in importance. The experimental ... -
The Effect of Temperature on the Gasification Process
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)Gasification is a technology that uses fuel to produce power and heat. This technology is also suitable for biomass conversion. Biomass is a renewable energy source that is being developed to diversify the energy mix, so ... -
THE EFFECT OF THE FILLING RATIO ON THE OPERATING CHARACTERISTICS OF AN INDIRECT DRUM DRYER
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)This article investigates the effect of the filling ratio of the indirect rotary dryers on their operating characteristics. For moist biomass drying before combustion, the use of indirect drum dryers heated by a low pressure ... -
The effects of potassium permanganate on the geotechnical properties of soils
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)In Nigeria, potassium permanganate (KMnO4) is used as a chemical oxidant in the removal of hydrocarbons from polluted soils and groundwater, but there is no information on the effects of KMnO4 on the geotechnical properties ... -
The Electrification of Tramways in Ostrava in 1900–1901
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)This paper focuses on the electrification of tramways in Ostrava in 1900-1901. As the administrative, economic and cultural centre of an evolving industrial agglomeration, Ostrava had specific transportation requirements. ... -
The engineering performance of eco-friendly concretes containing diatomite fly ash and ground granulated blast furnace slag
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Approximately 10 % of CO2 is emitted from an ordinary Portland cement production. In cement and concrete production, CO2 emissions can be greatly reduced by using Supplementary Cementitious Materials (SCMs). In addition, ... -
THE FIRST CENTURY OF COSMIC RAYS, AN HISTORICAL OVERVIEW
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)The 1912 balloon flights of Victor Hess and related activities in those years are reviewed. Subsequent research during the early 20th Century is noted, including the discovery of the positron, mesons, and air showers. The ... -
THE FIRST STARS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)Pop III stars are the key to the character of primeval galaxies, the first heavy elements, the onset of cosmological reionization, and the seeds of supermassive black holes. Unfortunately, in spite of their increasing ... -
THE FLOQUET METHOD FOR PT-SYMMETRIC PERIODIC POTENTIALS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)By the general theory of PT-symmetric quantum systems, their energy levels are either real or occur in complex-conjugate pairs, which implies that the secular equation must be real. However, for periodic potentials it is ... -
The Formation of a Power Multi-Pulse Extreme Ultraviolet Radiation in the Pulse Plasma Diode of Low Pressure
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)In this paper results are presented on experimental studies of the temporal characteristics of spike extreme ultraviolet (EUV) radiation in the spectral range of 12.2 ÷ 15.8 nm from the anode region of high-current (I = ... -
THE GERDA EXPERIMENT: STATUS AND FUTURE PLANS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)The GERDA experiment is searching for the neutrinoless double beta decay of 76Ge. An observation of the neutrinoless double beta decay will not only prove lepton number violation by two units, but also that the neutrino ...