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Wyświetlanie 1-15 z 320
Tytuł:
Accuracy analysis of the 2D resistance-to-voltage converters for resistive sensors
Autorzy:
Warsza, Z. L.
Idźkowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/114306.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
converter
error
uncertainty
Opis:
The novelty of this work is the analysis of accuracy measures and its visualization especially for the simultaneous two parameter measurements. The parameters of the resistance-to-voltage converters, i.e. different types of DC circuits with arbitrary variable resistive sensors (of relative resistance increments), and their accuracy measures are discussed. Transfer coefficients, limited error (and also standard uncertainty) as functions of relative increments of resistance are shown in broad range for different types of supply and sensor configuration of the circuit of initial 2D converters.
Źródło:
Measurement Automation Monitoring; 2015, 61, 10; 460-464
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Proposition of a method of determining the thermovision measurement extended uncertainty of the surface temperature of an object close to a camera lens
Autorzy:
Dziarski, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/114078.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
uncertainty
thermography
metrology
Opis:
In the article the influence of selected factors occurring during thermal measurements on the uncertainty of thermovision temperature measurement is discussed. A situation in which the observed surface was close to the camera lens was measured (distance less than one meter). Based on the type B determination methodology described in the literature on the subject, a method of calculating the measurement extended uncertainty is proposed. A division of factors influencing the thermovision temperature measurement uncertainty into external factors and internal factors is also proposed. Factors associated with the conditions prevailing during the measurement, the geometry of the measurement system and the properties of the observed surface were considered external factors. Factors related to the calibration of the thermal imaging camera, the sensor matrix used and the properties of its measuring path were qualified as internal factors. The method of determining the value of the camera display at the highest and lowest value of a particular factor is discussed. The probability distribution for each of the external factors was determined. The measuring system constructed is presented. It is explained how the uncertainty shares and expanded uncertainty were determined in accordance with the method proposed.
Źródło:
Measurement Automation Monitoring; 2019, 65, 1; 7-10
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Uwzględnienie niepewności pomiaru obydwu wielkości w regresji liniowej
Taking into consideration uncertainties of the both results in linear regreesion
Autorzy:
Dorozhovets, M.
Powiązania:
https://bibliotekanauki.pl/articles/151624.pdf
Data publikacji:
2008
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
linear regression
uncertainty
Opis:
W referacie została zaproponowana i przeanalizowana metoda regresji liniowej, która uwzględnia wpływ niepewności wielkości wejściowej oraz wyjściowej na wartość współczynnika nachylenia prostej. Poprawną wartość współczynnika nachylenia uzyskuje się na drodze minimalizacji sumy kwadratów odchyleń poszukiwanej prostej od punktów eksperymentalnych w kierunku maksymalnego wpływu niepewności wyników pomiaru. Wyprowadzono wzór do obliczenia współczynnika nachylenia prostej jako funkcji parametrów wyników obserwacji oraz ich standardowych niepewności. Wykazano, że wszystkie inne liniowe regresje są przypadkami szczególnymi zaproponowanej metody regresji.
In the paper a new method of calculation of the linear regression is proposed and analyzed. This method takes directly into account the influence of uncertainties of both input and output quantities onto the regression line slope. The correct slope value is calculated under condition to minimization the sum of the squared deviations of desired line from the experimental points in the direction of maximum influence of uncertainties. The formula for the calculation of the regression line slope in function of the parameters of observation results and their standard uncertainties is given. It is shown that all other linear regressions are the particular cases of the regression proposed in this paper.
Źródło:
Pomiary Automatyka Kontrola; 2008, R. 54, nr 9, 9; 612-615
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pressure Level Standard Deviation at Low Frecuencies: Effect of the Wall Vibrational Field
Autorzy:
Navacerrada, M. A.
Diaz, C.
Pedrero, A.
Powiązania:
https://bibliotekanauki.pl/articles/176711.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
building acoustic
uncertainty
Opis:
Knowledge of the uncertainty of measurement of testing results is important when results have to be compared with limits and specifications. In the measurement of sound insulation following standards ISO 140-4 and 140-5 the uncertainty of the final magnitude is mainly associated to the average sound pressure levels L1 and L2 measured. However, the study of sound fields in enclosed spaces is very difficult: there are a wide variety of rooms with different sound fields depending on factors as volume, geometry and materials. A parameter what allows us to quantify the spatial variation of the sound pressure level is the standard deviation of the pressure levels measured at the different positions of the room. Based on the analysis of this parameter some results have been pointed out: we show examples on the influence of the microphone positions and the wall characteristics on the uncertainty of the final magnitudes mainly at the low frequencies regime. In this line, we propose a theoretical calculus of the standard deviation as a combined uncertainty of the standard deviation already proposed in the literature focused in the room geometry and the standard deviation associated to the wall vibrational field.
Źródło:
Archives of Acoustics; 2012, 37, 4; 561-569
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantifying soil hydraulic properties and their uncertainties by modified GLUE method
Autorzy:
Yan, Yifan
Liu, Jianli
Zhang, Jiabao
Zhao, Yongchao
Xiaopeng, Li
Powiązania:
https://bibliotekanauki.pl/articles/973010.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
soil hydraulic properties
uncertainty
generalized likelihood uncertainty estimation
evaporation experiment
Opis:
Nonlinear least squares algorithm is commonly used to fit the evaporation experiment data and to obtain the ‘optimal’ soil hydraulic model parameters. But the major defects of nonlinear least squares algorithm include non-uniqueness of the solution to inverse problems and its inability to quantify uncertainties associated with the simulation model. In this study, it is clarified by applying retention curve and a modified generalised likelihood uncertainty estimation method to model calibration. Results show that nonlinear least squares gives good fits to soil water retention curve and unsaturated water conductivity based on data observed by Wind method. And meanwhile, the application of generalised likelihood uncertainty estimation clearly demonstrates that a much wider range of parameters can fit the observations well. Using the ‘optimal’ solution to predict soil water content and conductivity is very risky. Whereas, 95% confidence interval generated by generalised likelihood uncertainty estimation quantifies well the uncertainty of the observed data. With a decrease of water content, the maximum of nash and sutcliffe value generated by generalised likelihood uncertainty estimation performs better and better than the counterpart of nonlinear least squares. 95% confidence interval quantifies well the uncertainties and provides preliminary sensitivities of parameters.
Źródło:
International Agrophysics; 2017, 31, 3; 433-445
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ niepewności i nieprzewidywalności na procesy logistyczne
The influence of uncertainty and unpredictability on logistics processes
Autorzy:
Marzantowicz, Ł.
Jedliński, M.
Powiązania:
https://bibliotekanauki.pl/articles/134489.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
niepewność
nieprzewidywalność
niepewność w logistyce
parametryzacja skutków niepewności
uncertainty
unpredictability
uncertainty in logistics
parameterization of the uncertainty
Opis:
Autorzy artykułu na podstawie teoretycznych rozważań nad zjawiskiem niepewności i nieprzewidywalności w logistyce, bazując na przeglądzie stanowisk i podejść badawczych, podjęli próbę usystematyzowania semantyki w podjętym problemie oraz wskazują na obszary logistyki szczególnie podatne na niepewność i nieprzewidywalność, uwypuklając aspekt transportu morskiego. Teoretyczne rozważania nad rolą niepewności w procesie logistycznym oraz nad relacjami między pojęciami niepewności i nieprzewidywalności stanową podstawę do koncepcyjnego podejścia do możliwości pomiaru niepewności w lądowo-morskim procesie logistycznym. Ten sposób ujęcia problemu pozwala na realizację podstawowego celu artykułu, którym jest wyznaczenie miejsca dla sytuacji niepewności w logistyce na płaszczyźnie efektywności wykorzystania czasu i związku z tym wydajności procesów logistycznych.
The authors of the article on the basis of theoretical considerations on the phenomenon of uncertainty and unpredictability in logistics, based on a review of positions and research approaches, lead to attempts to systematize semantics in the taken problem and indicate the areas of logistics susceptible particularly to uncertainty and unpredictability. Theoretical considerations on the role of uncertainty in the logistics process and the relation between the concepts of uncertainty and unpredictability constitute the basis for a conceptual approach to the possibility of uncertainty’s measurement in the logistics process. The way of recognizing the problem realizes elementary aim of the article, which is to designate space for uncertainty in logistics at the area of efficiency of time and therefore productivity of logistics processes.
Źródło:
Problemy Transportu i Logistyki; 2017, 37, 1; 171-185
1644-275X
2353-3005
Pojawia się w:
Problemy Transportu i Logistyki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of uncertainty on capital structure
Autorzy:
Wennie, Wennie
Nugroho, Vina C
Powiązania:
https://bibliotekanauki.pl/articles/18104683.pdf
Data publikacji:
2023-09-28
Wydawca:
Szkoła Główna Handlowa w Warszawie. Kolegium Zarządzania i Finansów
Tematy:
target leverage ratio
uncertainty
Opis:
The purpose of this study is to determine the effect of uncertainty on the capital structure of public listed companies in Indonesia. This study used asset volatility as a method of measuring uncertainty. The researchers use unbalanced panel data from 2009 to 2019 in order to assess and analyse the effect of uncertainty on the company‘s capital structure. The results of this study indicate a positive relationship between uncertainty and the company‘s target leverage.
Źródło:
Journal of Management and Financial Sciences; 2023, 47; 71-86
1899-8968
Pojawia się w:
Journal of Management and Financial Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relational capital for managing the uncertainty of the environment
Autorzy:
Lenart, R.
Powiązania:
https://bibliotekanauki.pl/articles/348077.pdf
Data publikacji:
2015
Wydawca:
Akademia Wojsk Lądowych imienia generała Tadeusza Kościuszki
Tematy:
relational capital
uncertainty
environment
Opis:
The article is an attempt to show the essence of relational capital in the context of the environmental uncertainty. The problem is all the more important that, on the one hand, the uncertainty is a challenge for representatives of management sciences, on the other hand, it is an immanent feature of any business activity. There is a necessity to search for a remedy for the lack of information needed to make decisions and the inability to predict effects of the decisions taken. The aim of this article is to present the current theoretical achievements in terms of the essence of relational capital in the context of the uncertainty of the environment. The article is divided into three parts. The first of them is devoted to the essence of the environmental uncertainty. The second part concerns the nature of relational capital from the perspective of the resource approach. The third part is an attempt to present the essence of relational capital in the context of the environmental un-certainty. There are indicated capabilities of managing the uncertainty of the environment, which can be achieved through relational capital. The literature shows the deficit of scientific research (theoretical and empirical) referring to relational capital in the context of the uncertainty. Moreover, the existing acquis comprises interesting cognitive gaps which , when filled in, should contribute to a deeper understanding of relational capital versus the uncertainty of the environment - which is going to be the subject of the author's further research.
Źródło:
Zeszyty Naukowe / Wyższa Szkoła Oficerska Wojsk Lądowych im. gen. T. Kościuszki; 2015, 1; 58-68
1731-8157
Pojawia się w:
Zeszyty Naukowe / Wyższa Szkoła Oficerska Wojsk Lądowych im. gen. T. Kościuszki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Institutions: Uncertainty in Definition of the Term. A Brief Look at the history: 1890-1930
Autorzy:
Arnania-Kepuladze, Tamila
Powiązania:
https://bibliotekanauki.pl/articles/517417.pdf
Data publikacji:
2014
Wydawca:
Instytut Badań Gospodarczych
Tematy:
institution
behaviour
uncertainty
definition
Opis:
: Despite the fact that the significance of institutional economics is commonly recognized, the uncertainty of basic concepts of institutional economics – institutions – and its investigation sphere is widely mentioned today. The paper aims to trace the process of evolution in the understanding of the notion of institution, from its spontaneous mentions and pragmatic use of the so-called pre-institutional era to the desire to understand and to define the essence of the institution in the period of early institutionalism. Based on the analyses of appropriate literature, the paper tries to study how the term “institution” was understood at the three initial historical period of its usage. For this purpose, the first part of the paper analyses how the term “institu-tion” was used at the start by religious figures in VII and XIII centuries and then by thinkers in XVII-XVIII centuries which are considered as a pre-history of the term “institution” wide usage. The second part of the study is focused on the investigation how the term was understood by immediate predecessors of institutional economics – German Historical School, and the third part of the paper investigates scholars-institutionalists’ efforts in the intellectual context on the period 1890-1930.
Źródło:
Equilibrium. Quarterly Journal of Economics and Economic Policy; 2014, 9, 4; 79-102
1689-765X
2353-3293
Pojawia się w:
Equilibrium. Quarterly Journal of Economics and Economic Policy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New Approach to the Uncertainty Assessment of Acoustic Effects in the Environment
Autorzy:
Batko, W.
Pawlik, P.
Powiązania:
https://bibliotekanauki.pl/articles/177204.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
interval arithmetic
uncertainty
railway noise
Opis:
The acoustic climate assessment needed for the selection of solutions (technical, legal and organisa- tional), which will help to minimise the acoustic hazards in the analysed areas, is realised on the basis of acoustic maps. The reference computational algorithms, assigned to them, require very thorough prepa- ration of input data for the considered noise source model representing – in the best possible way – the acoustic climate. These input data are burdened with certain uncertainties in this class of computational tasks. The uncertainties are related to the problem of selecting proper argument values (from the inter- val of their possible variability) for the modelled processes. This situation has a direct influence on the uncertainty of acoustic maps. The idea of applying the interval arithmetic for the assessment of acoustic models uncertainty is formulated in this paper. The computational formalism assigned to the interval arithmetic was discussed. The rules of interval estimations for the model solutions determining the sound level distribution around the analysed noise source – caused by possible errors in the input data – were presented. The application of this formalism was illustrated in uncertainty assessments of modelling acoustic influences of the railway noise linear source on the environment.
Źródło:
Archives of Acoustics; 2012, 37, 1; 57-61
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conditions of the decision-making process
Autorzy:
Ścibiorek, Z.
Powiązania:
https://bibliotekanauki.pl/articles/348119.pdf
Data publikacji:
2017
Wydawca:
Akademia Wojsk Lądowych imienia generała Tadeusza Kościuszki
Tematy:
decision
risk
uncertainty
information
determinants
Opis:
In the article it has been emphasized, without analyzing the problematic situation, that making decision is becoming an increasingly complex process. This is influenced by many factors, mainly the dynamism of changes taking place and the significant impact of the environment. Information is essential to take correct and effective decisions. It is not always certain (reliable). Uncertainty and risk accompany decision makers and the point is that the decisions are adequate to the ensuing situation and create realistic determinants for achieving objectives – the implementation of the planned tasks. Interdisciplinary knowledge and high competences of persons making resolutions of complex decision problems are indispensable.
Źródło:
Zeszyty Naukowe / Wyższa Szkoła Oficerska Wojsk Lądowych im. gen. T. Kościuszki; 2017, 4; 249-271
1731-8157
Pojawia się w:
Zeszyty Naukowe / Wyższa Szkoła Oficerska Wojsk Lądowych im. gen. T. Kościuszki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena konsekwencji kryzysu pandemicznego COVID-19 w sektorze polskich przedsiębiorstw
Assessment of the consequences of the COVID-19 pandemic crisis in the enterprise sector in Poland
Autorzy:
Janecki, Jarosław
Powiązania:
https://bibliotekanauki.pl/articles/2194771.pdf
Data publikacji:
2022
Wydawca:
Kancelaria Sejmu. Biuro Analiz Sejmowych
Tematy:
confidence index
COVID-19
uncertainty
Opis:
The aim of the study is to analyse the impact of the COVID-19 pandemic on the situation of enterprises in Poland. For this purpose, the results of the CSO surveys were used (the impact of the COVID-19 pandemic on the economic situation), conducted from April 2020 to December 2021. The results of the research indicate a clear differentiation of the situation among enterprises in the analysed period. The problems caused by the pandemic were particularly pronounced among service companies in the accommodation and catering sector, retailers in the textile, clothing and footwear sector, and in the specialist construction sector companies. Moreover, in most cases, within a given problem caused by the pandemic, it was the smaller enterprises that indicated the existence of threats more often.
Źródło:
Studia BAS; 2022, 1(69); 49-68
2080-2404
2082-0658
Pojawia się w:
Studia BAS
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of the load on the hardness
Autorzy:
Petrik, J.
Palfy, P.
Powiązania:
https://bibliotekanauki.pl/articles/220458.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hardness
load
calibration
uncertainty
MSA
Opis:
The objective of the submitted paper is to analyze the influence of the load on the calibration of micro-hardness and hardness testers. The results were validated by Measurement Systems Analysis (MSA), Analysis of Variance (ANOVA) and Z-score. The relationship between the load and micro-hardness in calibration of micro-hardness testers cannot be explained by Kick's Law (Meyer's index "n" is different from 2). The conditions of Kick's Law are satisfied at macro-hardness calibration, the values of "n" are close to 2, regardless of the applied load. The apparent micro-hardness increases with the increase of the load up to 30 g; the reverse indentation size effect (ISE) behavior is typical for this interval of the loads. The influence of the load on the measured microhardness is statistically significant for majority of calibrations.
Źródło:
Metrology and Measurement Systems; 2011, 18, 2; 223-234
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
UNCERTAINTY ANALYSES IN ALBPETROL COMPANY
Autorzy:
Mjeda, Blerta
Powiązania:
https://bibliotekanauki.pl/articles/453489.pdf
Data publikacji:
2018
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki
Tematy:
uncertainty
simulation
evaluation
forecasting
scenarios
Opis:
Large companies like Albpetrol often deal with big projects. The decision to invest is based on the evaluation of the project profitability. But how certain is the calculated profitability? What if the costs overrun during implementation of the project? What if the reservoir performance is less than estimated? And what if the project completion is delayed? The focus will be on how to make people more aware of the risks and uncertainties in economic evaluations and to show the influence of these uncertainties on the economic indicators. Economic evaluations in the oil industry are carried out with cash flow models. Traditionally, these evaluations are carried out with the estimated (most likely) set of parameters. Usually some parameters, such as project costs or reserves, are varied manually as ‘sensitivities’ to show the potential impact on profitability. In this report, it is proposed to treat the uncertainties by defining stochastic parameters with carefully specified supports based on inputs from discipline experts. In this manner a better insight is gained in the distribution of the project profitability. Some of the key uncertainties in oil and gas investments have been investigated in detail. Thinking in terms of scenarios will help to take better decisions (e.g. about field development concepts) that are robust against a range of scenarios.
Źródło:
Metody Ilościowe w Badaniach Ekonomicznych; 2018, 19, 4; 411-418
2082-792X
Pojawia się w:
Metody Ilościowe w Badaniach Ekonomicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calibration performance investigation of an uncalibrated indigenous artefact probing for five-axis machine tool
Autorzy:
Rahman, M. M.
Mayer, R.
Powiązania:
https://bibliotekanauki.pl/articles/99523.pdf
Data publikacji:
2016
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
machine tools
robustness
uncertainty
artefact
Opis:
On machine measurement of artefacts such as single ball, multiple balls or even prismatic shape artefact is gaining popularity for the calibration of five-axis machine tools. However, calibration results can be degraded due to errors from different process variables such as the measurement strategies, rotary axes indexations and artefact dismount and remount cycles. This research investigates the repeatability of uncalibrated indigenous artefact probing and machine tool error parameters calibration against a number of process variables. Uncertainties of the estimated parameters are estimated to quantify the calibration quality.
Źródło:
Journal of Machine Engineering; 2016, 16, 1; 33-42
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 320

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