Temat: linear analysis - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Assessment of interpersonal trust of Poles by the principal components analysis and log-linear modeling
Autorzy:: Grześkowiak, Alicja
Powiązania:: https://bibliotekanauki.pl/articles/425118.pdf
Data publikacji:: 2014
Wydawca:: Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:: interpersonal trust
principal components analysis
log-linear analysis
Opis:: Interpersonal trust in Poland is found to be at a very low level. This paper aims at the analysis of this phenomenon on the basis of European Social Survey data. Principal components analysis was applied to examine the degree of interpersonal trust in Poland in relation to other countries. Associations of three dimensions of trust, i.e. trustfulness, fairness and helpfulness, were analyzed by log-linear modeling as well as an agreement measure relevant for categorical variables. A composite indicator based on the first principal component scores confirmed the relatively poor social trust of Poles. A moderate agreement on any two of the three facets of this phenomenon was uncovered and in most cases no interactions among all three aspects of interpersonal trust were detected.
Źródło:: Econometrics. Ekonometria. Advances in Applied Data Analytics; 2014, 1(43); 74-86
1507-3866
Pojawia się w:: Econometrics. Ekonometria. Advances in Applied Data Analytics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The non-linear strength-work of all body constructions the helicopter is - 2 during failure landing
Autorzy:: Fraczek, K. S.
Powiązania:: https://bibliotekanauki.pl/articles/241677.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport
helicopter
mechanic
FEM
non-linear analysis
Opis:: The article presents the phases of helicopter's flight during the failure of the power - driven system. On the basis of Federal Regulations part 27, which demands the throw from the height of 19 inches, some computer simulations of dynamical construction work were performed. Accordingly to the F.R.27 a thin wall constructions cannot be damaged permanently. In order to show the correct work of the helicopters construction a structure model was built using the finite element method. The paper contains only the work of some main elements, which influence the safety of passengers. The final conclusions were formulated based on the assessment of the method of analysis and based on the results of analytical simulations done on the movements and increasing inertia forces were introduced to the model. In order to analyse the construction its work of resistance was assessed as well as the safety factor. Due to the increasing load, we observed that a deformation of some elements was increasing in a non-linear manner. Therefore the analysis had to be done using the non-linear methods. The loads during landing without power are too much more as during optimal method, which was been presents in [1], the probability landing on ice with failure engine is very small, the non-linear analysis was necessary, because loads on deformed structure were bigger than in linear analysis, the landing without power is all safe in all extremely situations. The article describes construction's prototype.
Źródło:: Journal of KONES; 2008, 15, 4; 133-138
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Odds Ratios in the Analysis of Contingency Table
Iloraz szans w analizie tablic kontyngencji
Autorzy:: Brzezińska, Justyna
Powiązania:: https://bibliotekanauki.pl/articles/904451.pdf
Data publikacji:: 2013
Wydawca:: Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:: odds-ratio
contingency table
log-linear analysis
Opis:: Association and relationship is one of the most important tasks in statistical analysis. The main objective of the study is to examine odds ratios as a framework for understanding of contingency tables and log-linear models. Odds ratios are used to measure the association for contingency tables. They can be generalized to larger tables by local odds ratios or by the spanning cell approach. The properties of odds ratios and the relationship with log-linear analysis will be presented in the paper. An example is presented with the use of R.
Analiza zależności w statystyce stanowi jeden z podstawowych tematów badawczych. Celem artykułu jest zaprezentowanie ilorazu szans jako narzędzia opisu tablic kontyngencji, a także parametrów modelu logarytmiczno-liniowego. Iloraz szans jest miernikiem wykorzystywanym do badania związku w tablicach kontyngencji. Miernik ten można także uogólnić do tablic wielodzielczych poprzez użycie lokalnych ilorazów szans oraz podejścia opartego na krzyżowaniu komórek. Zaprezentowane zostaną własności ilorazu szans, a także ich związek z parametrami interakcji w analizie logarytmiczno-liniowej. Prezentacja ilorazu szans w części empirycznej zostanie zaprezentowana przy użyciu programu R.
Źródło:: Acta Universitatis Lodziensis. Folia Oeconomica; 2013, 286; 341-349
0208-6018
2353-7663
Pojawia się w:: Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Model Selection Methods in Log-Linear Analysis
Kryteria wyboru modelu w analizie logarytmiczno-liniowej
Autorzy:: Brzezińska, Justyna
Powiązania:: https://bibliotekanauki.pl/articles/905650.pdf
Data publikacji:: 2013
Wydawca:: Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:: log-linear analysis
contingency table
model selection methods
Opis:: The main objective of the study is to examine model selection methods in loglinear analysis. Log-linear analysis is a tool for independence analysis of qualitative data. Cell counts are Poisson distributed and all variables are treated as response. This method allows to analyze any number of variables in a multi-way contingency table. In log-linear analysis we model cell counts, where expected cell frequencies are functions of parameters representing characteristics of the categorical variables and their relationships with each other (interaction). The purpose of this paper is the presentation and comparison of model election criteria. The most popular statistics are chi-square test, likelihood ratio test and information criteria (AIC [Akaike 1973] and BIC [Raftery 1986]) but also Aitkin [Aitkin 1978] method for high dimensional tables.
Analiza logarytmiczno-liniowa jest metodą przeznaczoną do badania zależności pomiędzy zmiennymi niemetrycznymi w tablicy kontyngencji. Zmienne o rozkładzie Poissona traktowane są jako zmienne objaśniane. Metoda ta pozwala na analizę dowolnej liczby zmiennych, a także na uwzględnienie interakcji zachodzących pomiędzy nimi. W analizie logarytmiczno-liniowej modelowane są liczebności w poszczególnych komórkach tablicy, przy czym liczebności oczekiwane są funkcją parametrów reprezentujących zmienne dyskretne oraz relacje między nimi. Celem niniejszego artykułu jest prezentacja i porównanie kryteriów wyboru modelu w analizie logarytmiczno-liniowej. Podstawowymi kryteriami wyboru modelu są statystyka chikwadrat oraz iloraz wiarygodności oraz kryteria informacyjne AIC i BIC. W niniejszym artykule zaprezentowana zostanie także metoda Aitkina, która przeznaczona jest do porównywania jakości dopasowania modeli o dużej liczbie zmiennych.
Źródło:: Acta Universitatis Lodziensis. Folia Oeconomica; 2013, 285
0208-6018
2353-7663
Pojawia się w:: Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Safety format for non-linear pseudo-static response of the RC structural systems in accidental design situations
Autorzy:: Tur, V.
Tur, A.
Powiązania:: https://bibliotekanauki.pl/articles/132025.pdf
Data publikacji:: 2017
Wydawca:: Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.
Tematy:: non-linear analysis
progressive collapse
safety format
robustness
Opis:: The non-linear structural analysis is considered as a basic design procedure, which is used for checking of the structural robustness in accidental design situation. It is explained by following reason: a non-linear structural analysis based on realistic constitutive relations for basic variables (average values) makes possible a simulation of a real structural behavior. It should be pointed that, implementation of the non-linear structural analysis in design of concrete structures requires an alternate approach to safety verification. The paper presents a new approach to safety format for non-linear analysis of RC structures subjected to accidental loads.
Źródło:: Modern Engineering; 2017, 1; 1-10
2450-5501
Pojawia się w:: Modern Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Fatigue strength investigation of bonded joints
Autorzy:: Gieleta, R.
Derewońko, A.
Powiązania:: https://bibliotekanauki.pl/articles/243427.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: adhesive bonded joint
fatigue strength
non-linear analysis
Opis:: Numerous advantages of the bonded joints result in wide application in the aircraft, motor industry or powertrain components. These types of joints enable joining materials with different mechanical properties (e.g. Stiffness) and dimensions without structure change. Proper joint design limits the field of local stress concentrations or even eliminates them. The structural integrity of complete structure depends on the fatigue estimation of the bonded joint. Application of the finite element method to life prediction of the double lap bonded joint metal-composite-metal is presented. Three dimensional numerical models are generated by professional engineering software tools. The contact problem is modelled between the epoxy resin and metal and composite surfaces. A laminated composite consists of the epoxy woven carbon prepreg. Elasto-plastic materials models of the adhesion and metal and orthotropy composite model allowed determining the contact normal stress in the interfaces in each deformation increment which is induced by an external load. MSC.Marc was used to determine the strain and stress distribution in the double lap bonded joint including contact normal stress in the steel/adhesive and laminated composite/adhesive interfaces. Two numerical models of the double lap bonded joint were compared. The use of the presented method is more suitable for structure optimisation than numerical analysis.
Źródło:: Journal of KONES; 2007, 14, 3; 177-186
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Theory of the Stereological Analysis of Spheroid Size Distribution – Validation of the Equations
Autorzy:: Gurgul, D.
Burbelko, A.
Wiktor, T.
Powiązania:: https://bibliotekanauki.pl/articles/382285.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: stereological analysis
linear analysis
nodule size distribution
analiza stereologiczna
analiza liniowa
rozkład wielkości
Opis:: The paper presents validation tests for method which is used for the evaluation of the statistical distribution parameters for 3D particles’ diameters. The tested method, as source data, uses chord sets which are registered from a random cutting plane placed inside a sample space. In the sample space, there were individually generated three sets containing 3D virtual spheres. Each set had different Cumulative Distribution Function (CDF₃) of the sphere diameters, namely: constant radius, normal distribution and bimodal distribution as a superposition of two normal distributions. It has been shown that having only a chord set it is possible, by using the tested method, to calculate the mean value of the outer sphere areas. For the sets of data, a chord method generates quite large errors for around 10% of the smallest nodules in the analysed population. With the increase of the nodule radii, the estimation errors decrease. The tested method may be applied to foundry issues e.g. for the estimation of gas pore sizes in castings or for the estimation of nodule graphite sizes in ductile cast iron.
Źródło:: Archives of Foundry Engineering; 2017, 17, 4; 67-72
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Results of radon CR-39 detectors exposed in schools due two different long-term periods
Autorzy:: Stojanovska, Z.
Boev, B.
Zunic, Z. S.
Bossew, P.
Jovevska, S.
Powiązania:: https://bibliotekanauki.pl/articles/147386.pdf
Data publikacji:: 2016
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: comparison
linear regression analysis
relative bias
U test
Opis:: The paper deals with the recent survey of indoor radon (Rn) results in schools, where paired CR-39 detectors were simultaneously exposed to different long-term periods, i.e., one detector was exposed during the whole year and the other one in the period of the school year duration. To be able to compare the results obtained, for its analysis, the relative bias and U tests were used. It was found that there are no systematic differences between the results, which points that the exposure of the detector during summer vacations did not affect the estimated average annual radon concentration. The paired results were modelled by a linear function, giving an extremely high coeffi cient of determination R2 = 0.99.
Źródło:: Nukleonika; 2016, 61, 3; 385-389
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Application of multiple linear regression (MLR) analysis for concentration of chromite tailings by the flotation
Autorzy:: Deniz, Vedat
Powiązania:: https://bibliotekanauki.pl/articles/1449296.pdf
Data publikacji:: 2020
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: chromite
tailing
flotation
separation
multiple linear regression analysis
Opis:: In this study, the concentration of chromite minerals by amine flotation of a chromite tailing (slime) with content 23.84% Cr2O3 from Yeşilova-Burdur (Turkey) was investigated. In experimental studies, firstly, some operating parameters of the rougher flotation observed for a low-grade chromite tailing were investigated. Secondly, multiple linear regression (MLR) analyses were performed to determine the effects of some operating parameters on the performance of the rougher amine flotation. From the experimental results, multiple linear regression equations were developed to predict the recovery and grade of the chromite concentrate, and the regression coefficients between experimental and predicted values were found to be quite good (R2 values of 0.772 and 0.917, respectively). Additionally, it was found that the conditioning time and low pH value using $H_2SO_4$ showed an important effect on the recovery and the grade of the chromite concentrate.
Źródło:: Physicochemical Problems of Mineral Processing; 2020, 56, 4; 579-589
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Statistical yielding models of some irrigated vegetable crops in dependence on water use and heat supply
Autorzy:: Vozhehova, Raisa
Kokovikhin, Sergii
Lykhovyd, Pavlo V.
Balashova, Halyna
Lavrynenko, Yuriy
Biliaieva, Iryna
Markovska, Olena
Powiązania:: https://bibliotekanauki.pl/articles/292829.pdf
Data publikacji:: 2020
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: linear model
multiple linear regression analysis
onion
potato
tomato
yield modelling
Opis:: Statistical analysis is helpful for better understanding of the processes which take place in agricultural ecosystems. Particular attention should be paid to the processes of crops’ productivity formation under the influence of natural and anthropogenic factors. The goal of our study was to provide new theoretical knowledge about the dependence of vegetable crops’ productivity on water supply and heat income. The study was conducted in the irrigated conditions of the semi-arid cold Steppe zone on the fields of the Institute of Irrigated Agriculture of NAAS, Kherson, Ukraine. We studied the historical data of productivity of three most common in the region vegetable crops: potato, tomato, onion. The crops were cultivated by using the generally accepted in the region agrotechnology. Historical yielding and meteorological data of the period 1990–2016 were used to develop the models of the vegetable crops’ productivity. We used two approaches: development of pair linear models in three categories (“yield – water use”, “yield – sum of the effective air temperatures above 10°C”); development of complex linear regression models taking into account such factors as total water use, and temperature regime during the crops’ vegetation. Pair linear models of the crops’ productivity showed that the highest effect on the yields of potato and onion has the water use index (R² of 0.9350 and 0.9689, respectively), and on the yield of tomato – temperature regime (R² of 0.9573). The results of pair analysis were proved by the multiple regression analysis that revealed the same tendencies in the crop yield formation depending on the studied factors.
Źródło:: Journal of Water and Land Development; 2020, 45; 190-197
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Using GPU to improve performance of calculating recurrence plot
Użycie GPU w celu zwiększenia wydajności obliczania recurrence plot
Autorzy:: Rybak, T.
Powiązania:: https://bibliotekanauki.pl/articles/341073.pdf
Data publikacji:: 2010
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:: recurrence plot
analiza fraktalna
optymalizacja
obliczenia równoległe
GPGPU
CUDA
non-linear analysis
fractal analysis
optimisation
parallel computations
Opis:: Simulation and analysis of sophisticated systems require much computations. Moore’s law, although still allows for increasing number of transistors on the die, does not lead to increase of performance of single chip — instead it leads to increased parallelism of entire system. This allows for improving performance of those algorithms that can be parallelised; recurrence plot is one of such algorithms. Graphical Processing Units (GPU) show the largest increase of parallel computations capabilities. At the same time they do not behave as traditional CPUs and require different style of programming to fully utilise their capabilities. Article shows techniques that can be used to increase performance of computing of recurrence plot on GPGPU.
Analiza skomplikowanych systemów wymaga przeprowadzenia wielu obliczeń. Prawo Moore’a, choć wciąż˙ pozostaje w mocy, nie pozwala na zwiększanie wydajności pojedynczego procesora, ale pomaga w tworzeniu wydajnych równoległych systemów. Pozwala to na zwiększanie wydajności dla algorytmów które można zrównoleglić; recurrence plot należy do takich algorytmów. Procesory graficzne (GPU) oferują największą ilość równoległych jednostek obliczeniowych, jednocześnie jednak ich wydajne wykorzystanie wymaga innego podejścia programistycznego. Artykuł opisuje w jaki sposób wykorzystano technologię CUDA do przyśpieszania obliczania recurrence plot.
Źródło:: Zeszyty Naukowe Politechniki Białostockiej. Informatyka; 2010, 6; 77-94
1644-0331
Pojawia się w:: Zeszyty Naukowe Politechniki Białostockiej. Informatyka
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Analysis of trend changes in degree-day values of heating and cooling: broiler breeding case
Autorzy:: Yucel, A.
Atilgan, A.
Erdem, N.
Oz, H.
Powiązania:: https://bibliotekanauki.pl/articles/101664.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:: broiler
linear regression analysis
spearman rank correlation test
temperature
trend analysis
Opis:: An ideal broiler house should be designed to minimize the effects of weather changes and to keep indoor conditions at the comfort temperature of the animals. In this case, this should be done with minimum cost and possible lowest operating costs. Degree-day methods are used in order to have knowledge of the energy need of any structure. With this method, the measured values or meteorological data can be used to give information about the heating and cooling energy quantities of structures. Depending on the climate change in recent years, the changes need to be examined that have taken place in order to provide optimum comfort in animal barn. Isparta province and districts were selected as the study area. The longterm average daily temperature values are used from meteorological stations of the selected region. The heating and cooling degree day values were calculated for selected balance temperatures in broiler breeding. Linear Regression Analysis and Spearman Rank Correlation Test were conducted to determine the changes of these values due to climate change. In conclusion, it was determined that there were statistically significant trends at 5% significance level in Egirdir (21°C), Isparta (31-29-25 and 23°C), Kasimlar (18°C), Senirkent (31-29-25-23 and 21°C), Sutculer (all selected balance temperature values) and Yalvac (31-29-25-23 and 21°C) in terms of heating degree-day values, and in Atabey (29-25-23-21 and 18°C), Barla (25-23 and 21°C), Isparta (23-21 and 18°C), Senirkent (29- 25-23-21 and 18°C), Sutculer (29-25-23-21 and 18°C), Sarkikaraagac (25-23-21 and 18°C), Uluborlu (25-23-21 and 18°C) and Yalvac (25-23-21 and 18°C) in terms of cooling degree-day values. As a result, it has been concluded that more energy consumption will be a concern for heating and cooling of the broiler house that will be built in the province of Isparta.
Źródło:: Infrastruktura i Ekologia Terenów Wiejskich; 2017, II/2; 645-660
1732-5587
Pojawia się w:: Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Enhancing the GDEMs of Egypt Using a Surface Subtraction Approach
Autorzy:: El-Ashmawy, Nagwa
Al-Krargy, Essam
Powiązania:: https://bibliotekanauki.pl/articles/2105517.pdf
Data publikacji:: 2022
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: global DEM
DEM enhancement
empirical approach
linear regression analysis
Egypt
Opis:: This paper proposes an enhancement approach to improve the accuracy of global Digital Elevation Models (GDEMs) in Egypt. The proposed approach is an empirical one that depends on subtracting the heights error from the original DEM. The research includes the evaluation and enhancement of SRTM-1 (SRTM v4.1), ASTER GDEM v2, and AW3D30 v2 GDEMs, in Egypt, using 980 well distributed GPS/levelling points, that cover the entire country. The GPS/levelling points are divided into 500 control and 390 check points. The results show that the root mean square error (RMSE) in the SRTM, ASTER and AW3D30 are 3.99 m, 8.81 m, and 2.98 m respectively. For enhancing purposes, two different approaches are used: a linear regression analysis approach, and the proposed empirical surface subtraction approach. The results of the linear regression analysis approach show that the accuracies are improved by 3%, 16%, and 3% for SRTM, ASTER and AW3D30 respectively. However, the accuracies are improved by 5%, 23%, and 16% for SRTM, ASTER and AW3D30 respectively when the proposed approach is followed. After using the proposed approach, the obtained accuracy of the enhanced DEM reached 2.5 m.
Źródło:: Geomatics and Environmental Engineering; 2022, 16, 3; 57--77
1898-1135
Pojawia się w:: Geomatics and Environmental Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Wybór czynników determinujących wyjazdy turystyczne rencistów
The factors affecting choice of travel by pensioners
Autorzy:: Bąk, Iwona
Powiązania:: https://bibliotekanauki.pl/articles/453694.pdf
Data publikacji:: 2011
Wydawca:: Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki
Tematy:: analiza log-liniowa
gospodarstwa domowe rencistów
wyjazdy turystyczne
log-linear analysis
households of pensioners
tourist departures
Opis:: Celem artykułu jest próba wyodrębnienia zmiennych, które wpływają na podjęcie decyzji o wyjeździe turystycznym rencistów. W badaniu wzięto pod uwagę zmienne kategoryzacyjne i do wyboru optymalnego zbioru czynników decydujących o wyjeździe turystycznym wykorzystano analizę log-liniową. Informacje dotyczące aktywności turystycznej w gospodarstwach domowych rencistów zaczerpnięto z badań ankietowych „Turystyka i wypoczynek w gospodarstwach domowych” przeprowadzonych przez Główny Urząd Statystyczny w 2009 roku.
The aim of this article is to set variables that influence to make decision about the travel of pensioners. To choose the optimal set of factors determining destination of departure was used log-linear analysis because the research includes categorization variables. The information about tourists activity in pensioners households were taken from survey „Tourism and recreation in households” conducted by the Central Statistics Office 2009.
Źródło:: Metody Ilościowe w Badaniach Ekonomicznych; 2011, 12, 2; 1-10
2082-792X
Pojawia się w:: Metody Ilościowe w Badaniach Ekonomicznych
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Analysis of Spherical Particles Size Distribution – Theoretical Basis
Autorzy:: Gurgul, D.
Burbelko, A.
Wiktor, T.
Powiązania:: https://bibliotekanauki.pl/articles/379518.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: alloy crystallisation
mathematical models
analysis of spherical
planimetric analysis
linear analysis
krystalizacja stopów
modele matematyczne
analiza sferyczna
analiza planimetryczna
analiza liniowa
Opis:: The determination of the form of a probability density function (PDF3) of diameters for nodular particles by using a probability density function (PDF2), which form is empirically estimated from cross-sections of these nodules in a metallographic specimen, can be regarded as a special case of Wicksell's corpuscle problem (WCP). The estimation of the PDF3 for the nodular particles provides information about the kinetics of these particles nucleation, and so about the kinetics of their growth. This information is essential for building more accurate mathematical models of the alloy crystallization. In the paper there are presented two derivations of the methods used for the estimation of the PDF3 form. The first method bases on diameters received from a planar cross-section. The second one uses also data from the planar cross-section but not the diameters only chords. Both methods provide practical rules for the analysis of the empirical diameters’ and chord’s size distribution and allow to estimate the mean value of the external surface area of the particles.
Źródło:: Archives of Foundry Engineering; 2018, 18, 1; 29-34
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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