Acta Polytechnica: Poslední příspěvky
Zobrazují se záznamy 21-40 z 908
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The importance of using active thermal protection following restoration work on old buildings
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)The paper deals with the issue of humidity and the unhealthy environment of old buildings. Humidity is a very widespread problem not only in historical buildings, but also in newer buildings. This problem can be observed ... -
Emanuel Šlechta, engineer and entrepreneur in the First Republic of Czechoslovakia
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)This article traces the political, economic, and technical activities of Professor Emanuel Šlechta in the pre-war period and just after 1945. The aim is to answer the question: “What were Emanuel Šlechta’s activities during ... -
Landmark emancipation of technical intelligence in pre-World War II Czechoslovakia
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)This paper describes the development, activities, and both the scientific and social contributions of the Masaryk Academy of Labour, Czechoslovakia’s first technically oriented scientific institute and a major centre of ... -
Prague postal time service: clock and sirens – improbable connection
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)The goal of this paper is to present the origin, development, and technical parameters of the Postal Time Service, which was established in the capital of Czechoslovakia – Prague, gradually in the years 1933–1935. It also ... -
A geopolitics of the diaspora of British engineers in South America in the first half of the 20th century: the cases of the Institution of Locomotive Engineers centre in Argentina
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)The circulation of British engineers in South America during the first half of the twentieth century is a barely explored phenomenon that should be studied in the basis of methodologies that articulate the different elements ... -
Progress versus tradition – traditional craftsmanship and attempts at industrial tower clock production in the Czech lands in the 19th century
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)With the growing need for accurate timekeeping, the demand for clocks on public buildings increased in the 19th century. The only way to meet the demand, however, was to produce individual items by hand. Due to the ... -
Parametric optimisation of laser welding of stainless steel 316L
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)This paper presents numerical and experimental studies focused on the optimisation of laser welding parameters for AISI 316L stainless steel. The focus of the numerical studies was to obtain the mathematical model with the ... -
A practical way to apply a technique that accelerates time history analysis of structures under digitised excitations
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)Time history analysis using direct time integration is a versatile and widely accepted tool for analysing the dynamic behaviour of structures. In 2008, a technique was proposed to accelerate the time history analysis of ... -
Assessing the efficacy of flat-plate solar collectors using nanofluids in the climatic context of Kirkuk city, Iraq
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)Solar energy is a key renewable energy source. Research and development have focused on enhancing the heat transfer coefficient, heat gain, and practical efficiency of solar systems. The aim of this study is to evaluate ... -
Reverse engineering of pump as turbine for CFD analysis
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)Reverse engineering (RE) using 3D scanning is already a relatively technologically simple and cost-effective method. For water turbines, this is particularly true for RE of larger machines. With microturbines, there is a ... -
Problems with reinforced concrete industrial floors with regard to subsoil swelling
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)Most of the problems associated with open cracks in reinforced concrete industrial floors do not arise from technological indiscipline in the execution or exceeding the permitted floor load, but from the geotechnical profile ... -
Digital model of automated unmanned aerial vehicle with edge computing application for railway reconnaissance
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)In the last decade, unmanned aerial vehicles have been widely used in various civil and military field operations. Most modern drones are manually controlled by an operator and require decision making, which requires ... -
The classification of eye diseases from fundus images based on CNN and pretrained models
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)Visual impairment affects more than a billion people worldwide due to insufficient care or inadequate vision screening. Computer-aided diagnosis using deep neural networks is a promising approach, it can analyse and process ... -
Outdoor performance investigation of a thermoelectric cooler-integrated solar air heating collector
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)Solar air heating systems are continuously being improved by combining them with other energy conversion technologies. In this paper, outdoor tests were carried out on a thermoelectric heat-pumping solar air heater (TE-SAH), ... -
On the vortex identification within a linear blade cascade - an experimental research
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)This paper deals with the identification of the individual vortical structures within a linear blade cascade based on H criteria. The experimental data obtained from the pressure measurement at the cascade outlet were ... -
Reduction of torque pulsation in ultralight helicopter transmission
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)Usually, 1–2 seats helicopters use piston engines. One of their disadvantages is a significant torque pulsation on the engine shaft. The main reason for such fluctuations is the change in parameters during the engine’s ... -
Influence of carbonation on torrent air permeability of concrete
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)Air permeability testing is increasingly being used to measure the impermeability of concrete and to estimate the durability of reinforced concrete structures using this property. This paper presents the results of a ... -
Assessment of structures repeatedly exposed to thermal loading and extinguishing water: a case study of a firefighting training facility
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)When designing a new structure or assessing an existing one, the risk of fire and its effect on the structure must be considered. Structures are usually assessed for fire resistance at the design stage – i.e. before the ... -
Semi-analytical approach-based studies of the squeeze film lubrication between rough porous annular discs: Rabinowitsch fluid model
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)In recent years, there has been much interest in the effects of porosity and surface roughness (SR) or geometric irregularities between two moving plates under hydrodynamic lubrication. Porous bearings are used extensively ... -
Monitoring the internal structure behaviour of alkali-activated slag paste: effect of the curing mode
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)This paper deals with the monitoring of the internal structure behaviour of an alkaliactivated slag (AAS) paste. The slag was activated with a 4M solution of sodium hydroxide. The behaviour of the internal structure of the ...