VUIS - CESTY (Slovakia)

A numerical simulation of a uniform flow in an open channel under wind stress conditions was performed to investigate the wind effect on the surface velocity and the sub-surface velocity profile, which is of interest in river-discharge measurements. The results of the open-channel flow show that the surface velocity and the sub-surface profile are more sensitive to wind stress as the bed friction velocity is smaller and the water depth is larger. It is also found that the magnitude of the surface drift velocity in the open channel increases monotonically with the ratio of the wind stress to the bed shear stress and reaches a maximum of 3–4% of the wind speed. This fact suggests that the wind speed correction factor in the discharge measurement should be estimated considering hydraulic and wind conditions rather than a constant value. The surface drift velocity obtained by several river observations may include not only the drift current but also other unknown effects.

The transfer of new materials and technologies that are necessary for the development of new practices will lead to the development of innovation. These options are considered as (1) innovation, which means a significant improvement in the currently required parameters, mostly in parallel with the price increase, (2) innovation will meet the current parameters, but at a lower product / technology price, (3) innovation will achieve compliance with the applicable parameters, but at a higher price of the product / technology. In most cases, this is the second option, i. e. help the customer to enter the market at a lower price while maintaining the required product quality. This case also concerns the application of mixtures of the polymer-modified asphalt mixture type. The main goal of this work was the production and real laying on the verification section of the polymer-modified asphalt mixture. Based on the results obtained from this work, we can conclude that the values of the observed properties prescribed for a given class of asphalt mixtures in the catalogue sheets of asphalt mixtures were achieved without serious problems. Due to the trouble-free production of such mixtures in the plant, spreading and compaction of mixtures, we can express a clear conclusion that such mixtures are an ideal alternative to conventionally used polymer-modified-bitumen mixtures.

Hudba hraje v současných televizních reklamách značnou roli. Kvantitativní analýza 1 584 televizních reklamních spotů ukázala, že se hudba vyskytuje v 94,0 % reklam vysílaných v posledních několika letech v českých celoplošných televizích. To je jeden z nejvyšších podílů ve srovnání se závěry srovnatelných výzkumů z jiných zemí. Existují nicméně výrazné rozdíly v tom, jak se hudba v reklamách využívá. Ve většině z nich je hudba pouhou zvukovou kulisou. Někdy se zdá, že tvůrci reklam mají dojem, že hudba v reklamě zkrátka být musí bez ohledu na to, zda má nějaký vztah k ostatním složkám spotu či nikoliv. Na druhou stranu existuje řada příkladů velmi promyšleného zapojení hudby do výstavby spotů, včetně případů, kdy je hudební složka evidentně základním konstrukčním kamenem celého spotu. Pouze v případě jednoho spotu z deseti se dá říct, že propojení hudební a ostatních složek spotu je zřejmé, což velmi kontrastuje s více než padesátiprocentním podílem spotů, v nichž byla hudba hodnocena jako pouhá kulisa. Tato studie ukazuje, jakým způsobem reklamní tvůrci v současné době pracují s jednotlivými hudebními strukturními prvky, jako je tempo, tonalita, typy a žánry hudby nebo zpívaný text tak, aby přenesli nebo zdůraznili reklamní poselství.

Heating of a novel field shower equipment was computational simulated by CFD software in the schematic design phase, and the correction of simulation was verified in the environment laboratory. The results show that, the simulated temperature rise faster than the tested one. It took about 2 minutes earlier to arrive 25 °C, which is the design heating temperature for the shower equipment in cold environment. Since the simplification and assumption was used in the computational simulation, the simulation can reflect the objective situation.

We consider the connection between the thermal effect of a black hole and the restoration of a broken symmetry. It appears that the second law of thermodynamics could be violated in a special circumstance. It is shown that this does not happen if we impose some constraints on the Higgs field.

The Photostress and the photo-elastig coating technique weapply the Research Institute of Civil Engineering, Bratislava besides other experimental methods not only for the experimental stress analysis of models in laboratory but also during the construction and testing of bridges in situ. While the photoelastic model is still the only method for three-dimensional analysis, the surface coating technique permits the measurement of surface strains in the elastic or plastic ranges on structures, joints anchoring areas of pre-stressed concrete beams, atc., previously inaccessible to photo-elasticity. The use of experimental stress analysis techniques in situ is expanded in such fields as: establishment of design criteria, reduction of weight and cost of similar new structures or structural elements and improvement of product reliability. The photoelastic coatings, the photostress method combines the best features of strain gages and classical photoelasticity by providing a visible picture of the surface stress distribution of the component and stress distribution which is accurately readable at any point for both direction and magnitude.