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Aerodynamic Measurements on Transonic Compressor Blade Cascades KR-D-5 and KR-D-6
Šimurda, David; Hála, Jindřich; Luxa, Martin
2022 - anglický
This report contains results and evaluation of aerodynamic measurements conducted on two variant transonic compressor blade cascades with MCA profile (KR-D-5) and DCA profile (KR-D-6).
Klíčová slova:
compressor blade cascade; experiment; transonic flow; MCA profile; DCA profile
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Aerodynamic Measurements on Transonic Compressor Blade Cascades KR-D-5 and KR-D-6
This report contains results and evaluation of aerodynamic measurements conducted on two variant transonic compressor blade cascades with MCA profile (KR-D-5) and DCA profile (KR-D-6).
Inflation inequality in the Czech Republic
Adunts, Davit; Kurylo, Bohdana; Špeciánová, J.
2022 - anglický
This project employs Czech Household Budget Survey and Consumer Price Index data to create consumer price indices for various population subgroups in the Czech Republic. We find that subgroup-specific inflation rates are very similar to the inflation rate for all the non-elderly population, with the exception of single-parent households, which experienced a higher inflation rate in 2022 than did the other subgroups. However, the difference was reasonably modest. Importantly, we found that inflation issuing from housing, water, electricity, gas and other fuels is significantly higher for low-income and single-parent households than for high-income and two-parent households. The difference is particularly significant for single-parent households, for which inflation due to increases in housing, water, electricity, gas and other fuel costs represents 40.15 percent of their overall inflation burden compared to 28.44 percent for two-parent households. This finding suggests that the recent increases in electricity and gas prices may exert particularly harmful effects on single-parent households unless the government provides the support necessary to mitigate the adverse effects of rising prices. While all households are being affected by rising living costs, single-parent and low-income households should be prioritized in terms of support. In addition, we calculated that for low-income and single-parent households, the total loss of purchasing power due to inflation amounts to CZK 15,179 and CZK 20,445, respectively.
Klíčová slova:
inflation; households; Czech Republic
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Inflation inequality in the Czech Republic
This project employs Czech Household Budget Survey and Consumer Price Index data to create consumer price indices for various population subgroups in the Czech Republic. We find that subgroup-specific ...
Survey of the use of propane as refrigerant R290 in cooling circuits and heat pumps
Aminian, Ali; Prokopová, Olga; Vinš, Václav
2022 - anglický
The technical report presents a review on the application of propane as refrigerant R290 in cooling circuits and heat pumps (HVAC). Safety risks of R290 used in HVAC are addressed according to ANSI/ASHRAE and EN standards. Comparison of thermophysical properties of propane with other refrigerants, solubility and miscibility of propane in compressor oils and heat transfer in condenser and evaporator are discussed. The main aim of the study is to provide an overview about the potential use of propane in the cooling circuit and heat pump for the hydrogen bus developed by the SOR Libchavy company.
Klíčová slova:
cooling circuit; heat pump; hydrogen bus; refrigerant
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Survey of the use of propane as refrigerant R290 in cooling circuits and heat pumps
The technical report presents a review on the application of propane as refrigerant R290 in cooling circuits and heat pumps (HVAC). Safety risks of R290 used in HVAC are addressed according to ...
A Measure of Variability WIthin Parametric Families of Continuous Distributions
Fabián, Zdeněk
2022 - anglický
A continuous probability measure on an open interval of the real line induces in it a unique geometry, "center of gravity" of which is the typical value of the distribution. In the paper is identified a score variance as a finite measure of variability of distributions with respect to the typical value and discussed its properties and methods of estimation. Itroducing a generalized Rao distance in the sample space one can appraise the precision of the estimate of the typical value.
Klíčová slova:
scalar-valued score; score mean; score variance; distance in the sample space
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
A Measure of Variability WIthin Parametric Families of Continuous Distributions
A continuous probability measure on an open interval of the real line induces in it a unique geometry, "center of gravity" of which is the typical value of the distribution. In the paper is identified ...
Score correlation for skewed distributions
Fabián, Zdeněk
2022 - anglický
Based on the new concept of the scalar-valued score function of continuous distributions we introduce the score correlation coefficient ”tai-lored” to the assumed probabilistic model and study its properties by means of simulation experiments. It appeared that the new correlation method is useful for enormously skewed distributions.
Klíčová slova:
Scalar-valued score; score coefficient of variation; Monte Carlo
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Score correlation for skewed distributions
Based on the new concept of the scalar-valued score function of continuous distributions we introduce the score correlation coefficient ”tai-lored” to the assumed probabilistic model and study its ...
Introduction to statistical inference based on scalar-valued scores
Fabián, Zdeněk
2022 - anglický
In the report we maintain consistently the following point of view: Given a continuous model, there are not the observed values, which are to be used in probabilistic and statistical considerations, but their ”treated forms”,the values of the scalar-valued score function corresponding to the model. Based on this modified concept of the score function, we develop theory of score random variables, study their geometry and define their new characteristics, finite even in cases of heavy-tailed models. A generalization for parametric families provides a new approach to parametric point estimation.
Klíčová slova:
continuous distributions; score mean; score variance; score moment estimation method; score distance
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Introduction to statistical inference based on scalar-valued scores
In the report we maintain consistently the following point of view: Given a continuous model, there are not the observed values, which are to be used in probabilistic and statistical considerations, ...
Scalar-Valued Score Functions and their use in Parametric Estimation
Fabián, Zdeněk
2022 - anglický
In the paper we describe and explain a new direction in probabilistic and statistical reasoning, the approach based on scalar-valued score functions of continuous random variables. We show basic properties of score functions of standard distributions, generalize the approach for parametric families and show how to use them for solutions of problems of parametric statistics.
Klíčová slova:
core random variable; score mean; score variance; score distance; score correlation
Plné texty jsou dostupné na vyžádání prostřednictvím repozitáře Akademie věd.
Scalar-Valued Score Functions and their use in Parametric Estimation
In the paper we describe and explain a new direction in probabilistic and statistical reasoning, the approach based on scalar-valued score functions of continuous random variables. We show basic ...
Measurement on Compressor Cascade KOBRA
Luxa, Martin; Šimurda, David
2022 - anglický
The report contains results and evaluation of conducted optical (shadowgraph and schlieren technique) and pneumatic measurements on the profile cascade intended for the tip section of the first rotor row compressor blade.
Klíčová slova:
compressor cascade; transonic flow; optical measurement; pneumatic measurement
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Measurement on Compressor Cascade KOBRA
The report contains results and evaluation of conducted optical (shadowgraph and schlieren technique) and pneumatic measurements on the profile cascade intended for the tip section of the first rotor ...
A New Look to Information and Uncertainty of Continuous Distributions
Fabián, Zdeněk
2022 - anglický
We define information and uncertainty function of a family of continuous distributions. Their values are relative information and uncertainty of an observation from the given parametric family, their mean values are the generalized Fisher information and a new measure of variability, the score variance. In a series of examples we show why to use new concepts instead of the differential entropy.
Klíčová slova:
Differential entropy; information function; uncertainty function; mean information of distribution
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
A New Look to Information and Uncertainty of Continuous Distributions
We define information and uncertainty function of a family of continuous distributions. Their values are relative information and uncertainty of an observation from the given parametric family, their ...
Current status of natural refrigerants for heat pumps in an electric bus
Aminian, Ali; Vinš, Václav
2022 - anglický
The technical report provides a survey on the current status of hydrocarbons, with special focus on propane (R290), used as natural refrigerants in air‐conditioning units and heat pumps. Due to the\nexpected phase‐down of halogenated refrigerants planned in the regulation of the European Parliament no. 2022/0099/COD, alternatives such as hydrocarbons, carbon dioxide or ammonia are\nmost probably to be used in EU in the near future. A review of recent developments of HVAC units for residential use and for electric vehicles operated with natural refrigerants is presented.
Klíčová slova:
heat pump; electric bus; refrigeration
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Current status of natural refrigerants for heat pumps in an electric bus
The technical report provides a survey on the current status of hydrocarbons, with special focus on propane (R290), used as natural refrigerants in air‐conditioning units and heat pumps. Due to ...
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