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Influence of ball material on the resulting fatigue life of thermal sprayed HVOF coatings in dynamic impact testing
Duliškovič, J.; Daniel, Josef; Houdková, Š.
2024 - English
Dynamic impact wear, i.e. contact between two components in the presence of high cyclic local loads, is a challenging failure mode that occurs in many mechanical applications. Many previous studies have confirmed that dynamic impact testing is suitable for evaluating the contact fatigue of thermal sprayed coatings. However, the effect of the test parameters on the resulting lifetime is unclear. The aim of this study describes the effect of the ball material used in the dynamic impact test on the resulting fatigue life of the HVOF thermal sprayed coating. Three test balls made of WC/Co alloy, Si3N4 silicon nitride and 440 C steel were chosen for this study. Dynamic impaction testing was carried out on the Cr3C2-NiCr coating, which was sprayed by HVOF on a 1.2376 high-speed steel substrate. The impact lifetime was described by the number of critical impacts, i.e. the number of impacts before coating fatigue occurs. Furthermore, the depth and volume of impact craters were measured. Using scanning electron microscopy (SEM), the surface of the impacts as well as the microstructure of the coating on the cross-section in the region of the impacts were observed. Furthermore, the mechanism of crack propagation in the coating and the microstructure of the indentor were investigated. Keywords: dynamic impact test; HVOF; Cr3C2-NiCr; fatigue Available at various institutes of the ASCR
Influence of ball material on the resulting fatigue life of thermal sprayed HVOF coatings in dynamic impact testing

Dynamic impact wear, i.e. contact between two components in the presence of high cyclic local loads, is a challenging failure mode that occurs in many mechanical applications. Many previous studies ...

Duliškovič, J.; Daniel, Josef; Houdková, Š.
Ústav přístrojové techniky, 2024

Functional Tungsten-based thin films and their characterization
Košelová, Zuzana; Horáková, L.; Sobola, Dinara; Burda, Daniel; Knápek, Alexandr; Fohlerová, Z.
2024 - English
Anodizing is a technique by which thin oxide layers can be formed on a surface. Thin oxide layers have been found to be useful in a variety of applications, including emitters of electrons. Tungsten is still a common choice for cold field emitters in commercial microscopy applications. Its suitable quality can be further improved by thin film deposition. Not only the emission characteristic can be improved, but also the emitter operating time can be extended. Tungsten oxide is known for its excellent resistance to corrosion and chemical attack due to its stable crystal structure and strong chemical bonds between tungsten and oxygen atoms. Many techniques with different advantages and disadvantages have been used for this purpose. Anodization was chosen for this work because of the controllable uniform coverage of the material and its easy availability without the need for expensive complex equipment. The anodizing process involves applying an electrical potential to tungsten while it is immersed in an electrolyte solution. This creates a thin layer of tungsten oxide on the surface of the metal. The thickness and properties of the resulting oxide layer can be controlled by adjusting the anodization conditions, such as the electrolyte solution, voltage, and the duration of the process. In this work, H3PO4 was used as the electrolyte to test whether these tungsten oxide layers would be useful for electron emitters, for use in electron guns and other devices that require high-quality electron emitters. The properties were evaluated using appropriate techniques. In general, anodization of tungsten to form thin layers of tungsten oxide layers is a promising technique for producing high quality electron emitters. Keywords: cold-field emission; thin layer deposition; tungsten oxide; resonance enhanced tunneling; anodization Available at various institutes of the ASCR
Functional Tungsten-based thin films and their characterization

Anodizing is a technique by which thin oxide layers can be formed on a surface. Thin oxide layers have been found to be useful in a variety of applications, including emitters of electrons. Tungsten ...

Košelová, Zuzana; Horáková, L.; Sobola, Dinara; Burda, Daniel; Knápek, Alexandr; Fohlerová, Z.
Ústav přístrojové techniky, 2024

Parallels and differences of social situations with panic potential – IMPAKT 2023
Červenka, Jan; Vinopal, Jiří
2024 - Czech
A research report with main outputs of the surveys conducted under the project „Parallels and Differences of Social Situations with Panic Potential - an example of RMU and a coronavir pandemic in Czech society“ in 2023. Výzkumná zpráva s hlavními výsledky dotazníkových šetření provedených v rámci projektu „Paralely a odlišnosti sociálních situací s panickým potenciálem - příklad RMU a pandemie koronaviru v české společnosti“ v roce 2023. Keywords: social panic; radiation; citizen science Available at various institutes of the ASCR
Parallels and differences of social situations with panic potential – IMPAKT 2023

A research report with main outputs of the surveys conducted under the project „Parallels and Differences of Social Situations with Panic Potential - an example of RMU and a coronavir pandemic in ...

Červenka, Jan; Vinopal, Jiří
Sociologický ústav, 2024

Podnikání jako mužský svět? Využívání kompetencí v podnikání sebezaměstnaných žen a mikropodnikatelek v ČR
Maříková, Hana; Švarcová, Markéta; Křížková, Alena
2024 - Czech
Fulltext is available at external website.
Podnikání jako mužský svět? Využívání kompetencí v podnikání sebezaměstnaných žen a mikropodnikatelek v ČR

Maříková, Hana; Švarcová, Markéta; Křížková, Alena
Sociologický ústav, 2024

Vrt DO 599. Paleomagnetický a magnetomineralogický výzkum. Závěrečná zpráva
Kdýr, Šimon; Pruner, Petr; Uçar, Hakan; Elbra, Tiiu
2024 - Czech
Keywords: palaeomagnetism; rock-magnetism; greigite Available at various institutes of the ASCR
Vrt DO 599. Paleomagnetický a magnetomineralogický výzkum. Závěrečná zpráva

Kdýr, Šimon; Pruner, Petr; Uçar, Hakan; Elbra, Tiiu
Geologický ústav, 2024

The use of thermography in surveys of monuments
Valach, Jaroslav; Eisler, Marek
2024 - Czech
Thermography expands the portfolio of methods that can be used to study the properties of objects in the surrounding world. As recently as a decade ago, the technology was frowned upon for potential military applications controlled, which limited competition in the offer of products and manufacturers and led to high prices of devices based on these principles. It was only thanks to the release of this control that it happened to expand production and make simplified products available to mass use, so get it today for example, a customer can purchase a smartphone with an additional thermographic module for only with a small price increase. Together with the availability of equipment, we observe an increase in the application of thermography in many areas, including surveys of buildings and monuments. Termografie rozšiřuje portfolia metod, jimiž lze studovat vlastnosti objektů okolního světa. Ještě před deseti lety byla tato technologie kvůli potenciálním vojenským aplikacím úzkostlivě kontrolována, což omezovalo konkurenci v nabídce výrobků a výrobců a vedlo k vysokým cenám zařízení založených na těchto principech. Teprve díky uvolnění této kontroly došlo k rozmachu výroby a zpřístupnění zjednodušených výrobků masovému využití, takže si dnes může zákazník například pořídit chytrý telefon s doplňkovým termografickým modulem jen s malým navýšením ceny. Spolu s dostupností zařízení pozorujeme nárůst uplatnění termografie v mnoha oblastech, včetně průzkumů staveb a památek. Keywords: thermography; survey of historical structures Available at various institutes of the ASCR
The use of thermography in surveys of monuments

Thermography expands the portfolio of methods that can be used to study the properties of objects in the surrounding world. As recently as a decade ago, the technology was frowned upon for potential ...

Valach, Jaroslav; Eisler, Marek
Ústav teoretické a aplikované mechaniky, 2024

Financial management and financial satisfaction in Czech households
Fialová, Kamila; Mysíková, Martina
2024 - Czech
Household financial management is a complex process in which a variety of factors play a role in influencing household financial health. These factors are primarily the level of household income and expenditure, including the way in which housing is provided, household size and structure, education and financial literacy. An important aspect of household management is the balance of the budget, which is based on the distribution of financial resources between recurrent expenditure covering basic needs, more luxurious and irregular expenditure, and possibly also savings. Budget balance affects the financial stability of a household and its future prospects. In the case of households with more members, the distribution of income within the household can be another important aspect, which can affect not only the financial well-being of individual members but also have wider implications. \nInternationally comparable Eurostat data for 2018 show that Czechs have an average level of financial satisfaction among European nations. On a scale of 0 to 10, Czechs on average rated their financial satisfaction as 6.7, while the European average was 6.6. Czech men (6.8) were slightly more satisfied than women (6.6). Since 2013, the data showed a significant increase in the financial satisfaction of Czech households from an average rating of 6.0. \nData from the 2023 IPSOS sample survey rate the financial satisfaction of Czechs as 5.5 on average (on the same scale from 0 to 10), with men again more satisfied (5.7) than women (5.3). Roughly one-third of respondents are very or rather dissatisfied with their financial situation (0-4), while more than half of respondents are rather or very satisfied with their financial situation (6-10).\nThe results of the regression analysis show that demographic characteristics such as gender, age, education or presence of children do not affect financial satisfaction. In general, people living with a spouse/partner and single individuals are more satisfied with their financial situation than those divorced and widowed. \nThe key factors influencing financial satisfaction are the amount of household income and how they manage it, as well as the accumulation of short-term or long-term financial reserves. Paying a mortgage or rent does not significantly reduce financial satisfaction. Repaying loans significantly reduces financial satisfaction for women living as a couple.\n Finanční hospodaření domácností je komplexní proces, ve kterém hrají roli různorodé faktory ovlivňující finanční zdraví domácnosti. Těmito faktory jsou v první řadě výše příjmu a výdajů domácností včetně způsobu zajištění bydlení, velikost a struktura domácností, vzdělání či finanční gramotnost. Důležitým aspektem hospodaření je vyrovnanost rozpočtu, která vychází z rozdělení finančních zdrojů mezi pravidelné výdaje pokrývající základní potřeby, luxusnější a nepravidelné výdaje a případně také úspory. Vyrovnanost rozpočtu ovlivňuje finanční stabilitu domácnosti a její vyhlídky do budoucna. V případě vícečlenných domácností může být dalším důležitým aspektem rozdělení příjmů v rámci domácnosti, které může ovlivnit nejen finanční blahobyt jednotlivých členů, ale může mít i širší dopady. \nMezinárodně srovnatelná data Eurostatu za rok 2018 ukazují, že Češi mezi evropskými národy patří k těm průměrně spokojeným se svou finanční situací. Češi na škále od 0 do 10 průměrně hodnotili svoji finanční spokojenost známkou 6,7, zatímco evropský průměr byl 6,6. Čeští muži (6,8) byli o něco spokojenější než ženy (6,6). Od roku 2013 byl v datech patrný výrazný růst finanční spokojenosti českých domácností z průměrného hodnocení 6,0. \nData z výběrového šetření IPSOS v roce 2023 hodnotí finanční spokojenost Čechů v průměru známkou 5,5 (na stejné škále od 0 do 10), přičemž muži jsou opět více spokojeni (5,7) než ženy (5,3). Zhruba třetina respondentů je se svou finanční situací velmi či spíše nespokojena (0–4), více než polovina respondentů je se svou finanční situací naopak spíše či velmi spokojena (6–10).\nVýsledky regresní analýzy ukazují, že demografické charakteristiky jako pohlaví, věk, vzdělání či přítomnost dětí nemají na finanční spokojenost vliv. Obecně jsou se svou finanční situací spokojenější lidé žijící s partnerem/partnerkou a svobodní než rozvedení a ovdovělí. \nStěžejními faktory ovlivňujícími finanční spokojenost Čechů je výše příjmů domácnosti a to jak s nimi vychází, tedy „plusový“ rozpočet, stejně jako vytváření krátkodobé či dlouhodobé finanční rezervy. Splácení hypotéky či placení nájmu finanční spokojenost významně nesnižuje. Splácení úvěrů významně snižuje finanční spokojenost žen žijících v páru. \n Keywords: financial resilience; financial satisfaction; household finance Fulltext is available at external website.
Financial management and financial satisfaction in Czech households

Household financial management is a complex process in which a variety of factors play a role in influencing household financial health. These factors are primarily the level of household income and ...

Fialová, Kamila; Mysíková, Martina
Sociologický ústav, 2024

The American origin of the French Revolution
Ottinger, Sebastian; Rosenberger, L.
2024 - English
We show that the French combatants’ exposure to the United States increased support for the French Revolution a decade later. French regions from which more American combatants originated had more revolts against feudal institutions, revolutionary societies, volunteers for the revolutionary army, and emigrants from the Old Regime’s elite. To establish causality, we exploit two historical coincidences: i) originally, a French army of seven and a half thousand was ready to sail, but one-third did not, ii) among those deployed, only some regiments were stationed in New England. Only combatants exposed to New England affected the French Revolution after their return. Keywords: institutional change; French Revolution; American War of Independence Fulltext is available at external website.
The American origin of the French Revolution

We show that the French combatants’ exposure to the United States increased support for the French Revolution a decade later. French regions from which more American combatants originated had more ...

Ottinger, Sebastian; Rosenberger, L.
Národohospodářský ústav, 2024

Survey expectations, adaptive learning and inflation dynamics
Rychalovska, Y.; Slobodyan, Sergey; Wouters, R.
2024 - English
The use of survey information on inflation expectations as an observable in a DSGE model can substantially refine identification of the shocks that drive inflation. Optimal integration of the survey information improves the model forecast for inflation and for other macroeconomic variables. Models with expectations based on an Adaptive Learning setup can exploit survey information more efficiently than their Rational Expectations counterparts. The resulting time-variation in the perceived inflation target, in inflation persistence, and in the sensitivity of inflation to various shocks provide a rich and consistent description of the joint dynamics of realized and expected inflation. Our framework produces a reasonable interpretation of the post-Covid inflation dynamics. Our learning model successfully identifies the more persistent nature of the recent inflation surge. Keywords: inflation; expectations; survey data Fulltext is available at external website.
Survey expectations, adaptive learning and inflation dynamics

The use of survey information on inflation expectations as an observable in a DSGE model can substantially refine identification of the shocks that drive inflation. Optimal integration of the survey ...

Rychalovska, Y.; Slobodyan, Sergey; Wouters, R.
Národohospodářský ústav, 2024

Digitální systémy pro monitorování BOZP
VÚBP
2024 - Czech
Digitální systémy pro monitorování BOZP využívají digitální technologii ke shromažďování a analýze dat za účelem identifikace a hodnocení rizik na pracovišti. Keywords: digitalizace; digitální systémy; BOZP; bezpečnost práce; digitalisation; digital systems; OSH; occupational safety Available in a digital repository NRGL
Digitální systémy pro monitorování BOZP

Digitální systémy pro monitorování BOZP využívají digitální technologii ke shromažďování a analýze dat za účelem identifikace a hodnocení rizik na pracovišti.

VÚBP
Výzkumný ústav bezpečnosti práce, v.v.i., 2024

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