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Wyświetlanie 1-15 z 83
Tytuł:
A parametric testing of the firefly algorithm in the determination of the optimal osmotic drying parameters of mushrooms
Autorzy:
Yeomans, J.S.
Powiązania:
https://bibliotekanauki.pl/articles/91745.pdf
Data publikacji:
2014
Wydawca:
Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Tematy:
Firefly Algorithm
FA
osmotic dehydration
mushroom
dehydration model
surface technique
mathematical programming
optimal process parameters
Opis:
The Firefly Algorithm (FA) is employed to determine the optimal parameter settings in a case study of the osmotic dehydration process of mushrooms. In the case, the functional form of the dehydration model is established through a response surface technique and the resulting mathematical programming is formulated as a non-linear goal programming model. For optimization purposes, a computationally efficient, FA-driven method is used and the resulting optimal process parameters are shown to be superior to those from previous approaches. The final section of this study provides a computational experimentation performed on the FA to analyze its relative sensitivity over a range of the two key parameters that most influence its running time.
Źródło:
Journal of Artificial Intelligence and Soft Computing Research; 2014, 4, 4; 257-256
2083-2567
2449-6499
Pojawia się w:
Journal of Artificial Intelligence and Soft Computing Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study on carbonation depth prediction for concrete made with GBFS cement and FA addition
Badanie dotyczące prognozowania głębokości karbonatyzacji betonu wykonanego z cementu GBFS z dodatkiem FA
Autorzy:
Lech, Maciej
Juszczak, Tomasz
Wawrzeńczyk, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/2124786.pdf
Data publikacji:
2022
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
concrete carbonation
carbonation model
carbonation accelerated testing
GBFS cement
FA addition
karbonatyzacja betonu
model karbonatyzacji
przyspieszone badania karbonatyzacji
cement GBFS
dodatek FA
Opis:
This paper presents the results of the examination of accelerated carbonation of concrete mixes made with CEM III / A blast furnace slag cement and the addition of fly ash. The test program was developed using an experiment design with two factors: a water-binder ratio and a fly-ash / cement ratio. Carbonation depth measurements were carried out according to FprCEN/TS 12390-12 (CO2 concentration = 4%, T = 20°C, RH = 55%). Associated tests were also carried out, including compressive strength, porosity, depth of absorption, water penetration depth, and capillary suction. Analysis of the test results allowed us to determine the influence of binder composition on concrete carbonization depth under standard test conditions. The results show that the carbonation depth increases along with the increase in the W/B ratio and as a result of the increase in the fly ash content in the binder. A mathematical model was developed to describe the carbonation process over time, which can predict the depth and rate of concrete carbonation. Furthermore, it was found that there is no close relationship between other properties tested (e.g. strength) and the depth of the carbonated concrete.
W pracy przedstawiono wyniki badań przyspieszonej karbonatyzacji mieszanek betonowych wytworzonych cementem żużlowym wielkopiecowym CEM III/A z dodatkiem popiołu lotnego. Program badań został opracowany na podstawie projektu eksperymentu z dwoma czynnikami: stosunkiem wody do spoiwa oraz stosunkiem popiołu lotnego do cementu. Pomiary głębokości karbonatyzacji przeprowadzono zgodnie z FprCEN/TS 12390-12 (stężenie CO2 = 4%, T = 20°C, RH = 55%). Przeprowadzono również powiązane testy, w tym wytrzymałości na ściskanie, porowatości, głębokości absorpcji, głębokości penetracji wody i ssania kapilarnego. Analiza wyników badań pozwoliła na określenie wpływu składu spoiwa na głębokość karbonatyzacji betonu w standardowych warunkach testowych. Wyniki wskazują, że wraz ze wzrostem stosunku W/B oraz zawartością popiołu lotnego w spoiwie wzrasta głębokość karbonatyzacji. Opracowano model matematyczny do opisu procesu karbonatyzacji w czasie, który umożliwia przewidywanie głębokości i szybkości karbonatyzacji betonu. Ponadto stwierdzono, że nie ma ścisłego związku między innymi badanymi właściwościami (np. wytrzymałością) a głębokością betonu karbonatyzowanego.
Źródło:
Structure and Environment; 2022, 14, 1; 1--10
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Advanced helical gear reducer design optimization through nature inspired algorithms
Autorzy:
Ebenezer, N. Godwin Raja
Saravanan, R.
Ramabalan, S.
Navaneethasanthakumar, S.
Powiązania:
https://bibliotekanauki.pl/articles/1178368.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
CS
DIN Standards
FA
GA
Helical gear reducer design
MATLAB solvers fmincon
Nature inspired Algorithms SA
metaheuristics
optimization
Opis:
In this paper a high power helical gear pair design optimization problem is solved. It is a multi variable, complex non linear problem with derived objective function and constraints. The objective is to minimize the volume of the gear. The design parameters considered are module, face width, number of teeth on drive and driven and helix angle. The various factors for sizing and strength of gear geometry parameters are based on German Institute for Standardization (DIN) Standards. Nature inspired algorithms, namely, Simulated Annealing (SA), Fire fly (FA) and Cuckoo Search (CS) and MATLAB solvers fmincon, GA are used. Simulation results are analysed and compared with literature.
Źródło:
World Scientific News; 2017, 77, 2; 267-280
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of potential risks of SMS-based authentication
Autorzy:
Szpunar, Albert
Stęchły, Arkadiusz
Powiązania:
https://bibliotekanauki.pl/articles/31233158.pdf
Data publikacji:
2023
Wydawca:
Patryk Organiściak
Tematy:
authentication
cyber security
two-factor authentication
2FA
SMS
text message
uwierzytelnianie
bezpieczeństwo cybernetyczne
uwierzytelnianie dwuskładnikowe
wiadomość tekstowa
Opis:
The pervasive use of mobile devices and the omnipresence of the Internet have ushered in a transformative era. Nearly everyone, regardless of age, possesses a mobile phone, bridging generational gaps in digital interaction. Mobile phones have become highly personal, with users guarding them zealously. Service providers recognize this intimate relationship, offering an opportunity to enhance security. Traditional password-based security is vulnerable to data breaches, prompting the adoption of mobile phones as a more robust platform for safeguarding digital assets. This shift has also facilitated the development of digital identification applications, reducing reliance on physical identity documents. Additionally, mobile banking applications are replacing physical payment cards, enabling secure transactions. The ascendancy of mobile payment solutions is diminishing the role of physical cash and wallets. In summary, mobile devices have reshaped security and daily activities, becoming the cornerstone of our digital existence, offering higher levels of security, convenience, and efficiency.
Źródło:
Advances in Web Development Journal; 2023, 1; 13-25
2956-8463
Pojawia się w:
Advances in Web Development Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of RRAP reliability optimization as a test of nature-inspired algorithms
Autorzy:
Pieprzycki, Adam
Filipowicz, Bogusław
Powiązania:
https://bibliotekanauki.pl/articles/35533466.pdf
Data publikacji:
2024-02-15
Wydawca:
Akademia Tarnowska
Tematy:
reliability optimization
RRAP
Firefly Algorithm (FA)
Cuckoo Search (CS)
ANOVA
Lévy flight
Opis:
This paper presents a discussion on the application of two swarm intelligence algorithms, Cuckoo Search (CS) and Firey Algorithm (FA), to maximize the reliability of two complex systems with resource constraints, which have been well-known in the literature. The reliability of the systems is also evaluated using several classical methods. The results indicate that although the CS algorithm, which utilizes Lévy flight, is eective, the FA rey algorithm outperformed it in the presented optimization tasks, within the given parameter range. These ndings contribute to the ongoing discussion on using nature-inspired algorithms for solving Reliability Redundancy Allocation Problem (RRAP) problems, and the two test scenarios used in the study can be useful for validating other algorithms in RRAP problems. The paper introduces metrics and methods for analyzing and comparing the performance of algorithms in RRAP optimization, including the comparison of criterion function values and other parameters introduced in the paper. Additionally, the paper discusses statistical analyses of variance (ANOVA) with post-hoc RIR Tuckey tests.
Źródło:
Science, Technology and Innovation; 2023, 18, 3-4; 1-14
2544-9125
Pojawia się w:
Science, Technology and Innovation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Baric Shift of Phase Transition in Ammonium Sulfate Crystals
Autorzy:
Gaba, V.
Powiązania:
https://bibliotekanauki.pl/articles/1550311.pdf
Data publikacji:
2010-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.84.Fa
78.20.Ci
77.80.Bh
Opis:
The influence of uniaxial mechanical pressures ($σ_m$ ≤ 200 bar) on the spectral (300-800 nm) and temperature (77-300 K) dependences of the refractive indices $n_{i}$, the birefringence $Δn_{i}$ and the phase transition point in ammonium sulfate crystals are studied. It is established that the uniaxial pressure does not change character of the dispersion $dn_{i}$/dλ, but only its value λ The shift of the phase transition in ammonium sulfate under the uniaxial mechanical pressure is analyzed.
Źródło:
Acta Physica Polonica A; 2010, 117, 1; 126-128
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Birefringence of Mechanically Stressed Potassium Tetrachlorine Zincanate Crystals
Autorzy:
Stadnyk, V.
Gaba, V.
Kohut, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1550377.pdf
Data publikacji:
2010-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.84.Fa
78.20.Ci
77.80.Bh
Opis:
The spectral and baric dependences of the birefringence $Δn_{i}$ of $K_{2}ZnCl_{4}$ crystals were studied. It is shown that the dispersion $Δn_{i}(λ)$ is normal and sharply increases on approaching the absorption edge. It is established that the uniaxial pressures do not change the character but only the values of the dispersions $dΔn_{i}$/dλ and temperature dependences of $dΔn_{i}$/dT.
Źródło:
Acta Physica Polonica A; 2010, 117, 1; 133-135
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics and biological properties of ferulic acid
Autorzy:
Dędek, Kamil
Rosicka-Kaczmarek, Justyna
Nebesny, Ewa
Kowalska, Gabriela
Powiązania:
https://bibliotekanauki.pl/articles/410448.pdf
Data publikacji:
2019
Wydawca:
Politechnika Łódzka. Wydawnictwo Politechniki Łódzkiej
Tematy:
ferulic acid
FA
health-promoting properties of FA
synthesis of FA in plants
metabolism of FA
kwas ferulowy
własciwości prozdrowotne kwasu ferulowego
synteza kwasu ferulowego u roślin
metabolizm kwasu ferulowego
Opis:
The interest in the properties of hydroxycinnamic acids with health-promoting properties is constantly increasing. That is why more and more research is being conducted to better understand these properties. Ferulic acid, FA (4-hydroxy-3-methoxycinnamic acid) is a derivative of hydroxycinnamic acid found in the plant tissue. It is possible to find him among others in bran cereal, popcorn bamboo shoots, and coffee. According to available literature data ferulic acid has a lot of biological properties, particularly appreciated in medicine. Its bioactive properties effectively contribute to the fight against diseases described as a civilization, including neurodegenerative diseases that increase the incidence. As reported the World Alzheimer Report, the number of people with dementia progression in 2016 exceeded 47.5 million, of which 33.5 million were diagnosed with Alzheimer's disease. According to the WHO estimates, this number will triple by 2050. The manuscript presents health-promoting properties of FA on the example of its antioxidant, antidiabetic, hepatoprotective, anti-atherosclerotic, neuroprotective, antineoplastic and antibacterial properties. In addition, the reaction of its synthesis in plants and in-vivo metabolization have been explained. The collected data suggest that bioactive FA molecules can effectively reduce the risk of civilization diseases and significantly reduce the level of oxidative stress contributing to the formation of neurodegenerative diseases.
Źródło:
Biotechnology and Food Science; 2019, 83, 1; 71-85
2084-0136
2299-6818
Pojawia się w:
Biotechnology and Food Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Critical Currents, Magnetization and Microwave Absorption of $(Tl_{0.5}Pb_{0.5})Sr_2(Ca_{0.8}Gd_{0.2})Cu_2O_{z}$ Superconductor
Autorzy:
Woch, W.
Niewolski, J.
Tokarz, W.
Kołodziejczyk, A.
Sudra, H.
Gritzner, G.
Powiązania:
https://bibliotekanauki.pl/articles/1536936.pdf
Data publikacji:
2010-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.81.Bd
74.25.Sv
74.81.Fa
Opis:
The bulk ($Tl_{0.5}Pb_{0.5})Sr_2(Ca_{1 - x}Gd_{x})Cu_2O_{z}$ superconductors with x = 0.1, 0.2 and 0.3 have unique and very interesting magnetic and electrical properties. In this paper we focused our attention on the superconductor with gadolinium content x = 0.2. We measured the magnetic field dependences of the transport critical currents, the microwave absorption as well as the magnetization for different temperatures. The critical temperature of this sample is $T_c$ = 105.3 ± 0.2 K and the transition width Δ $T_{90% - 10%}$ = 3.6 ± 0.2 K. The critical current of this superconductor is $J_c$ = 1 820 ± 10 A/$cm^2$ at 77 K. The data were analyzed within the frame of the Bean and Kim models as well as the percolation model.
Źródło:
Acta Physica Polonica A; 2010, 118, 2; 319-322
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cross Sections for l-Mixing of K(n$\text{}^{2}$F) States in Collisions with Ground-State K(4$\text{}^{2}$S) Atoms
Autorzy:
Głódź, M.
Huzandrov, A.
Klavins, J.
Sydoryk, I.
Szonert, J.
Gateva-Kostova, S.
Kowalski, K.
Powiązania:
https://bibliotekanauki.pl/articles/2014246.pdf
Data publikacji:
2000-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.50.Fa
Opis:
We report measurements of the cross sections σ$\text{}_{l-mix}$ for angular momentum mixing of the K(n$\text{}^{2}$F)(n=6, 7, 8) states with the K(n,l > 3) states, induced in thermal collisions with parent ground state K(4$\text{}^{2}$S) atoms. The experiment was performed in a cell heated to ca. 450K. The n$\text{}^{2}$F states were excited in two steps: 4$\text{}^{2}$S → 4$\text{}^{2}$P → n$\text{}^{2F}$ by using a diode laser for the first step (a dipole-transition) and a pulsed dye laser for the second step (a quadrupole-transition). The measured values σ$\text{}_{l-mix}$ (6$\text{}^{2}$F)=3.6+-2.2, σ$\text{}_{l-mix}$ (7$\text{}^{2}$F)=4.2+-2.6 and σ$\text{}_{l-mix}$ (8$\text{}^{2}$F)=8.0+-4.6 (in units of 10$\text{}^{-13}$cm$\text{}^{-1}$) are close to the corresponding values of the geometrical cross sections.
Źródło:
Acta Physica Polonica A; 2000, 98, 4; 353-361
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of radiation attenuation coefficients in concretes containing different wastes
Autorzy:
Özavci, S.
Çetın, B.
Powiązania:
https://bibliotekanauki.pl/articles/1068130.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
28.52.Fa
28.41.Qb
Opis:
Environmental wastes can be cleaned in a very long time by ecosystem. However, the cleaning power of the ecosystem is not enough. For this reason, the evaluation of the different areas of waste processing is important. In this study attenuation coefficient of gamma rays has been investigated for concretes containing different amounts of glass, bulb and plastic wastes.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 316-317
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of the natural radioactivity level of Amasya Şeyhcui Region
Autorzy:
Coşkun, A.
Çetın, B.
Powiązania:
https://bibliotekanauki.pl/articles/1068311.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
28.52.Fa
28.41.Qb
Opis:
People are exposed to both internal and external radiation from the natural radiation sources. For this reason, studies determining the natural radiation level are made to detect the effects of radionuclides, that constitute the natural radiation sources, on the environment and especially the effects of radiation on people and on biological systems. The most common radiation sources are ²³⁸U, ²²⁶Ra, ²³²Th and ⁴⁰K radioisotopes. In this study, in the samples of the rock and soil acquired from Amasya Şeyhcui Region, the activity concentrations of ²²⁶Ra, ²³²Th and ⁴⁰K are determined by using NaI (Tl) detector with gamma spectrometer and are compared with the limit values.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 309-310
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dielectric Properties of K$\text{}_{1-x}$(NH$\text{}_{4}$)$\text{}_{x}$H$\text{}_{2}$PO$\text{}_{4}$ (x= 0.095) Crystal
Autorzy:
Kaszyński, J.
Trybuła, Z.
Małuszyńska, H.
Powiązania:
https://bibliotekanauki.pl/articles/2043401.pdf
Data publikacji:
2005-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.84.Fa
77.22.-d
77.22.Ch
77.22.Gm
77.80.-e
64.70.Pf
Opis:
Temperature dependences of the dielectric permittivity were studied for the ferroelectric K$\text{}_{1-x}$(NH$\text{}_{4}$)$\text{}_{x}$H$\text{}_{2}$PO$\text{}_{4}$ mixed crystal. The experiments revealed presence of the beginning of the dipolar glass - embryos in the concentration of ammonium x=0.095. Observations of the dielectric relaxations show much bigger effect domain mechanism than the one related to the growth of clusters of the dipolar glass.
Źródło:
Acta Physica Polonica A; 2005, 108, 1; 103-106
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 83

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