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Wyświetlanie 1-15 z 91
Tytuł:
Effect of Infrared Drying on the Drying Kinetics and the Quality of Mango (Mangifera indica) Powder
Autorzy:
Nguyen, Phuoc-Bao-Duy
Nguyen, Thi-Van-Linh
Nguyen, Thi-Thuy-Dung
Powiązania:
https://bibliotekanauki.pl/articles/28408451.pdf
Data publikacji:
2024-03-01
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
antioxidant activity
fruit powder
phenolics
pulp drying
Weibull model
Opis:
Mango powder is a nutrient-dense substance that can be used directly or as a supplement in food items. However, due to the high sugar content, the removal of moisture from mango was difficult. This study investigated an infrared drying technique for removing moisture from mango pulp to produce powder products. The experiment was designed in a three-factor full factorial design with the following variables: drying temperature (70, 75, and 80°C), maltodextrin content (0, 6, and 9 g/100 g pulp), and total soluble solid content (11 and 16°Brix). The findings indicated that the Weibull model was the most appropriate for describing the moisture removal of mango pulp during infrared drying. Higher temperature and maltodextrin content, along with reduced total soluble solid content, resulted in improved quality of the mango powder. Furthermore, the optimal drying conditions for mango powder were found as 11°Brix, 80°C, and 9% maltodextrin content, which could ensure the highest retention of total phenolics (59.874%), retention of reducing sugars (71.044%), total acidity (10.141%), and retention of DPPH radical scavenging activity (65.051%). To fully benefit from the rewards of infrared drying, it is essential to establish suitable pretreatment conditions or use additives to preserve component quality.
Źródło:
Polish Journal of Food and Nutrition Sciences; 2024, 74, 1; 69-81
1230-0322
2083-6007
Pojawia się w:
Polish Journal of Food and Nutrition Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Average capacity analysis of FSO system with Airy beam as carrier over exponentiated Weibull channels
Autorzy:
Li, Yi
Chu, Xingchun
Han, Zhongxiang
Tang, Hanling
Song, Xinkang
Powiązania:
https://bibliotekanauki.pl/articles/2202763.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Airy beam
free-space optical communication
channel capacity
exponentiated Weibull model
Opis:
Based on scintillation index of Airy beam and exponentiated Weibull channel model, analytical expressions of average channel capacity for free-space optical (FSO) communication links with Airy beam as signal carrier under weak atmospheric turbulence and on-off keying modulation scheme are derived. The average capacity at various propagation distances, transverse scale factors and exponential decay factors has been evaluated. And we compared the average capacity of FSO links with Airy beam and Gaussian beam as signal carrier. The results show that the average capacity of FSO links with Airy beam as carrier increases with the increase of mean signal-to-noise ratio and decreases uniformly with the increase of propagation distance. When the transverse scale factor of Airy beam is about 2 cm, a higher average capacity can be obtained. And the smaller the exponential decay factor of Airy beam, the larger the average capacity. Under the same source power or source width, the average capacity of FSO links with Airy beam as carrier is significantly higher than that of FSO links with Gaussian beam as carrier. The results of this research have some reference significance for the application of Airy beam in FSO communication system.
Źródło:
Optica Applicata; 2023, 53, 1; 35--48
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterisation of some generalised continuous distributions by doubly truncated moments
Autorzy:
Athar, Haseeb
Ahsanullah, Mohammad
Ali, Mohd. Almech
Powiązania:
https://bibliotekanauki.pl/articles/2204096.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
truncated moment
characterisation
probability distribution
Weibull
power function
Frechet
Pareto
Lindley
Opis:
The characterisation of probability distribution plays an important role in statistical studies. There are various methods of characterisation available in the literature. The characterisation using truncated moments limits the observations; hence, researchers may save time and cost. In this paper, the characterisation of three general forms of continuous distributions based on doubly truncated moments has been studied. The results are given simply and explicitly. Further, the results have been applied to some well-known continuous distributions.
Źródło:
Operations Research and Decisions; 2023, 33, 1; 1--19
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathematical Calculation of Material Reliability Using Surface Roughness Feature Based on Plasma Material Interaction Experiment Results
Autorzy:
Pahsa, Alper
Aydoğdu, Yıldırım
Göktaş, Fahrettin
Powiązania:
https://bibliotekanauki.pl/articles/27312789.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
tokamak
material reliability
Weibull
divertor
PMI
Plasma Material Interaction
Opis:
The choice of reactor structural material design must take into account the TOKAMAK fusion reactors' structural reliability. Due to their high levels of heat and energy, fusion reactions have significant deformation effects, which reduce the efficiency of energy production in reactors. Material selection, erosion and damage, heat and stress management, reliability analysis, maintenance, and inspection are crucial elements in determining how reliable fusion reactors are. The focus of this work is on material selection and reliability analysis based on these parameters. The most common wall materials used in fusion reactors are tungsten, beryllium, steel, or graphite. It is advised to utilize aluminum because harmful Beryllium dust limits the study of this element. For this purpose, a target of aluminum samples is established with a plasma of He ions created by glow discharge. The dependability of the samples is determined by calculating the Weibull Distribution and measuring the roughness of the sample surfaces following exposure.
Źródło:
Eksploatacja i Niezawodność; 2023, 25, 3; art. no. 169815
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical investigation of production-related characteristics regarding their influence on the fatigue strength of additively manufactured components
Autorzy:
Zeißig, Michaela
Jablonski, Frank
Powiązania:
https://bibliotekanauki.pl/articles/2204622.pdf
Data publikacji:
2023
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
additive manufacturing
fatigue strength
Weibull distribution
FEM
Opis:
In order to further enhance the application of additive manufacturing (AM) processes, such as the laser powder bed fusion (L-PBF) process, reliable material data are required. However, the resulting specimen properties are significantly influenced by the process parameters and may also vary depending on the material used. Therefore, the prediction of the final properties is difficult. In the following, the effect of residual stresses on the fatigue strength of 316L steel, a commonly used steel in AM, is investigated using a Weibull distribution. The underlying residual stress distributions as a result of the building process are approximated for two building directions using finite element (FE) models. These imply significantly different distributions of tensile and compressive residual stresses within the component. Apart from the residual stresses, the impact of the mean stress sensitivity is discussed as this also influences the predicted fatigue strength values.
Źródło:
Acta Mechanica et Automatica; 2023, 17, 2; 288--291
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Complete Set of Distinguishable Diagnostic States for a Centrifugal Pump System
Pełny zbiór rozróżnialnych stanów diagnostycznych pompy wirowej
Autorzy:
Szczepański, Paweł
Kijak, Robert
Powiązania:
https://bibliotekanauki.pl/articles/27314951.pdf
Data publikacji:
2023
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
digraph
Weibull index
transition matrix
reachability matrix
transition intensity
digraf
wykładnik Weibulla
macierz przejść
macierz osiągalności
intensywności przejść
Opis:
In this article, the concept of determination of a complete set of distinguishable diagnostic states has been utilised, which has been well known since the 1980’s and, in essence, could refer to any item with any application and any structural features. The only condition set for this item, is its ability to be described by a structure consisting of single exit-point elements. As a consequence, it can become possible to assess, amongst other things, its layers, strong cohesions, transitive and antitransitive closures. Typical tools of such assessment are matrices: transition and reachability. The reason that a centrifugal pump has been selected is not only its importance and common use, but also specifics of interaction of its elements. It is possible to identify for them: independence, dependence, and interdependence. For particular distinguishable diagnostic states, the probabilities of its occurrence have been determined. These probabilities have become a starting point to estimate structure entropy and intensity of transition from the health to any particular failure state. Results of such estimation have been depicted by relevant graphs. A reference has been made to the Bayesian methods and the inseparable ‘serial reliability structure’, to identify their flaws that result particularly from simplifications leading to false and ambiguous diagnoses. The probabilities of health for particular elements have been differentiated by the selection of adequate Weibull indices.
W artykule posłużono się, znaną od lat osiemdziesiątych ubiegłego wieku, koncepcją wyznaczania pełnego zbioru rozróżnialnych stanów diagnostycznych, która w istocie rzeczy może odnieść się do dowolnego obiektu o dowolnym przeznaczeniu i dowolnych cechach konstrukcyjnych. Jedyny warunek jaki stawia się przed obiektem to możliwość jego opisu strukturą połączeń elementów jednowyjściowych. Konsekwencją stanie się wtedy możliwość poznania m.in. jego: warstw, silnych spójności, zamknięć tranzytywnych i zamknięć antytranzytywnych. Typowymi narzędziami tego poznania są macierze: przejść i osiągalności. Powodem wybrania pompy wirowej jest nie tylko jej ważkość i powszechność użycia, ale i specyfika współdziałania jej elementów. Można wśród nich wyróżnić: niezależność, zależność i współzależność. Poszczególnym rozróżnialnym stanom diagnostycznym wyznaczono prawdopodobieństwa ich wystąpienia. Owe prawdopodobieństwa stały się przyczynkiem do kalkulacji entropii struktury i intensywności przejść od stanu zdatności do poszczególnych stanów niezdatności. Wyniki kalkulacji zobrazowano stosownymi wykresami. Odniesiono się do metod bayesowskich i nierozłącznej z nimi „szeregowej struktury niezawodnościowej” wykazując ich wady, spowodowane zwłaszcza uproszczeniami prowadzącymi do fałszywych i niejednoznacznych diagnoz. Prawdopodobieństwa zdatności poszczególnych elementów zróżnicowano doborem adekwatnym im wykładników Weibulla.
Źródło:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2023, 14, 3 (53); 95--118
2081-5891
Pojawia się w:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The modified Bagdonavičius-Nikulin goodness-of-fit test statistic for the right censored distributional validation with applications in medicine and reliability
Autorzy:
Yousof, Haitham M.
Ali, M. Masoom
Aidi, Khaoula
Ibrahim, Mohamed
Powiązania:
https://bibliotekanauki.pl/articles/18105193.pdf
Data publikacji:
2023-09-08
Wydawca:
Główny Urząd Statystyczny
Tematy:
inverted Weibull distribution
censored validation
Bagdonavičius-Nikulin
goodness-of-fit testing
Opis:
A modified version of Bagdonavičius-Nikulin goodness-of-fit statistical test is presented for validation under the right censor case. Simulation via Barzilai-Borwein algorithm is performed for assessing the right-censorship estimation method. Four right censored data sets are analyzed under the new modified test statistic for checking the distributional validation.
Źródło:
Statistics in Transition new series; 2023, 24, 4; 1-18
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A method for obtaining the preventive maintenance interval in the absence of failure time data
Autorzy:
Sánchez-Herguedas, Antonio
Mena-Nieto, Ángel
Rodrigo-Muñoz, Francisco
Powiązania:
https://bibliotekanauki.pl/articles/2175137.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
ship maintenance
preventive interval
maintenance model
semi-Markovian process
incomplete data
Weibull function
maintenance costs
Opis:
One of the ways to reduce greenhouse gas emissions and other polluting gases caused by ships is to improve their maintenance operations through their life cycle. The maintenance manager usually does not modify the preventive intervals that the equipment manufacturer has designed to reduce the failure. Conditions of use and maintenance often change from design conditions. In these cases, continuing using the manufacturer's preventive intervals can lead to non-optimal management situations. This article proposes a new method to calculate the preventive interval when the hours of failure of the assets are unavailable. Two scenarios were created to test the effectiveness and usefulness of this new method, one without the failure hours and the other with the failure hours corresponding to a bypass valve installed in the engine of a maritime transport surveillance vessel. In an easy and fast way, the proposed method allows the maintenance manager to calculate the preventive interval of equipment that does not have installed an instrument for measuring operating hours installed.
Źródło:
Eksploatacja i Niezawodność; 2022, 24, 3; 564--573
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gas turbine reliability estimation to reduce the risk of failure occurrence with a comparative study between the two-parameter Weibull distribution and a new modified Weibull distribution
Autorzy:
Djeddi, Ahmed Zohair
Hafaifa, Ahmed
Iratni, Abdelhamid
Kouzou, Abdellah
Powiązania:
https://bibliotekanauki.pl/articles/2096209.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
failure analysis
malfunction analysis
availability
reliability estimation
failure occurrence
maintenance plan
gas turbine
two-parameter Weibull
modified Weibull
analiza uszkodzeń
dostępność
ocena niezawodności
turbina gazowa
Opis:
Responding to the needs of quality and robustness of analysis and management of degradation of equipment, to increase their life cycle and to expand these facilities to become more and more sophisticated and agronomic. This work proposes a contribution to increase the survival of a gas turbine, installed in a gascompression plant, with a comparative study between the two-parameter Weibull distribution. A new modified Weibull distribution was proposed also to reduce the risk of occurrence of failure in this rotating machine. A Statistical analysis and validation on the synthesis of turbine's reliability data and failures were considered, with a particular focus on the use of this data to increase the availability of this type of machine. So, developing a maintenance plan based on their reliability indices for scheduled inspections.
Źródło:
Diagnostyka; 2022, 23, 1; 1--18
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Generalised Lindley shared additive frailty regression model for bivariate survival data
Autorzy:
Pandey, Arvind
Hanagal, David D.
Tyagi, Shikhar
Powiązania:
https://bibliotekanauki.pl/articles/2156991.pdf
Data publikacji:
2022-12-15
Wydawca:
Główny Urząd Statystyczny
Tematy:
Bayesian estimation
frailty
generalised Lindley frailty
generalised log-logistic distribution
generalised Weibull distribution
hazard rate
MCMC
random censoring
Opis:
Frailty models are the possible choice to counter the problem of the unobserved heterogeneity in individual risks of disease and death. Based on earlier studies, shared frailty models can be utilised in the analysis of bivariate data related to survival times (e.g. matched pairs experiments, twin or family data). In this article, we assume that frailty acts additively to the hazard rate. A new class of shared frailty models based on generalised Lindley distribution is established. By assuming generalised Weibull and generalised log-logistic baseline distributions, we propose a new class of shared frailty models based on the additive hazard rate. We estimate the parameters in these frailty models and use the Bayesian paradigm of the Markov Chain Monte Carlo (MCMC) technique. Model selection criteria have been applied for the comparison of models. We analyse kidney infection data and suggest the best model.
Źródło:
Statistics in Transition new series; 2022, 23, 4; 161-176
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prediction model of the pandemic spreading based on weibull distribution
Autorzy:
Guľáš, Ľuboš
Talian, Matej
Szabo, Stanislav
Semrádová, Beáta
Powiązania:
https://bibliotekanauki.pl/articles/2204124.pdf
Data publikacji:
2022
Wydawca:
STE GROUP
Tematy:
pandemics
prediction model
weibull distribution
Opis:
Pandemics have the potential to cause immense disruption of our everyday activities and has impact on the communities and societies mainly through the restrictions applied to the business activities, services, manufacturing, but also education, transportation etc. Therefore, it is important to create suitable prediction models to establish convenient methods for the planning of the operations and processes to cope with the difficulty. In this paper, the prediction model for the spread of the viral disease in term of the estimated maximal weekly confirmed cases and weekly deaths using the Weibull distribution as a theoretical model for statistical data processing is presented. The theoretical prediction model was applied and confirmed on the data available for the whole world and compared to the situation in Europe and Slovakia for the pandemic waves and can be used for the more precise prediction of the pandemic situation and to enhance planning of the activities and processes regarding to the restrictions applied during the worsening pandemic situation.
Źródło:
Management Systems in Production Engineering; 2022, 2 (30); 179--186
2299-0461
Pojawia się w:
Management Systems in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Half-Logistic Odd Power Generalized Weibull-G Family of Distributions
Autorzy:
Peter, Peter O.
Chipepa, Fastel
Oluyede, Broderick
Makubate, Boikanyo
Powiązania:
https://bibliotekanauki.pl/articles/2119924.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
half logistic distribution
half logistic-G distribution
Weibull generalized-G distribution
maximum likelihood estimation
Opis:
We develop and study in detail a new family of distributions called Half- logistic Odd Power Generalized Weibull-G (HLOPGW-G) distribution, which is a linear combination of the exponentiated-G family of distributions. From the special cases considered, the model can fit heavy tailed data and has non-monotonic hazard rate functions. We further assess and demonstrate the performance of this family of distributions via simulation experiments. Real data examples are given to demonstrate the applicability of the proposed model compared to several other existing models.
Źródło:
Central European Journal of Economic Modelling and Econometrics; 2022, 1; 1-35
2080-0886
2080-119X
Pojawia się w:
Central European Journal of Economic Modelling and Econometrics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The odd power generalized Weibull-G power series class of distributions: properties and applications
Autorzy:
Oluyede, Broderick
Moakofi, Thatayaone
Chipepa, Fastel
Powiązania:
https://bibliotekanauki.pl/articles/2034112.pdf
Data publikacji:
2022-03-15
Wydawca:
Główny Urząd Statystyczny
Tematy:
Weibull-g distribution
power series
Poisson distribution
logarithmic distribution
maximum likelihood estimation
Opis:
We develop a new class of distributions, namely, the odd power generalizedWeibull-G power series (OPGW-GPS) class of distributions. We present some special classes of the proposed distribution. Structural properties, have also been derived. We conducted a simulation study to evaluate the consistency of the maximum likelihood estimates. Moreover, two real data examples on selected data sets, to illustrate the usefulness of the new class of distributions. The proposed model outperforms several non-nested models on selected data sets.
Źródło:
Statistics in Transition new series; 2022, 23, 1; 89-108
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Weibull lifetime model with randomised failure-free time
Autorzy:
Sulewski, Piotr
Szymkowiak, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/2156948.pdf
Data publikacji:
2022-12-15
Wydawca:
Główny Urząd Statystyczny
Tematy:
Weibull lifetime model
randomised failure-free time
compound Weibull distributions
Opis:
The paper shows that treating failure-free time in the three-parameter Weibull distribution not a constant, but as a random variable makes the resulting distribution much more flexible at the expense of only one additional parameter.
Źródło:
Statistics in Transition new series; 2022, 23, 4; 59-76
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A method for estimating the probability distribution of the lifetime for new technical equipment based on expert judgement
Autorzy:
Andrzejczak, Karol
Bukowski, Lech
Powiązania:
https://bibliotekanauki.pl/articles/2038033.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
uncertainty
expert elicitation of lifetime
quantile function
Weibull distribution
Opis:
Managing the exploitation of technical equipment under conditions of uncertainty requires the use of probabilistic prediction models in the form of probability distributions of the lifetime of these objects. The parameters of these distributions are estimated with the use of statistical methods based on historical data about actual realizations of the lifetime of examined objects. However, when completely new solutions are introduced into service, such data are not available and the only possible method for the initial assessment of the expected lifetime of technical objects is expert methods. The aim of the study is to present a method for estimating the probability distribution of the lifetime for new technical facilities based on expert assessments of three parameters characterizing the expected lifetime of these objects. The method is based on a subjective Bayesian approach to the problem of randomness and integrated with models of classical probability theory. Due to its wide application in the field of maintenance of machinery and technical equipment, a Weibull model is proposed, and its possible practical applications are shown. A new method of expert elicitation of probabilities for any continuous random variable is developed. A general procedure for the application of this method is proposed and the individual steps of its implementation are discussed, as well as the mathematical models necessary for the estimation of the parameters of the probability distribution are presented. A practical example of the application of the developed method on specific numerical values is also presented.
Źródło:
Eksploatacja i Niezawodność; 2021, 23, 4; 757-769
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
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