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Tytuł:
Relationships between hybrid performance and genetic distance revealed by morphological and AFLP marker in cucumber
Autorzy:
Olfati, J. A.
Samizadeh, H.
Peyvast, Gh.
Rabiei, B.
Khodaparast, S. A.
Powiązania:
https://bibliotekanauki.pl/articles/2199652.pdf
Data publikacji:
2012-04-19
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
cluster analysis
diallel
heterosis
orthogonal comparison
similarity matrix
Opis:
This study investigated the relationship of morphological and molecular genetic distance with hybrid performance and heterosis in cucumber in an attempt to make use of genetic distance in predicting hybrid performance. The results of this study showed that GD, in general, correlated poorly with heterosis and SCA. Results showed that the mean values of the hybrids were significantly larger or smaller for many traits when compared with the mean of parental lines, indicating that heterosis was present for these traits. In next step we compare inter group hybrids versus intra group hybrids. This test showed that intra group hybridization although increased the yield and yield component but decrease some fruit quality such as fruit color and shape.
Źródło:
Plant Breeding and Seed Science; 2012, 65; 87-98
1429-3862
2083-599X
Pojawia się w:
Plant Breeding and Seed Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zróżnicowanie genetyczne linii wsobnych kukurydzy a plonowanie odmian mieszańcowych
Genetic distance among inbred lines of maize and its association with hybrid performance
Autorzy:
Rogacki, Janusz
Bulińska-Radomska, Zofia
Dzienkiewicz, Jakub
Adamaczyk, Józef
Cygert, Henryk
Powiązania:
https://bibliotekanauki.pl/articles/42821662.pdf
Data publikacji:
2009
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
markery molekularne
plon mieszańców
Zea mays L.
hybrid performance
molecular markers,
Opis:
Celem pracy była ocena zróżnicowania genetycznego 10 linii wsobnych o ziarnie zębokształtnym (dent) i 7 linii o ziarnie szklistym (flint) kukurydzy w relacji do plonowania 70 mieszańców eksperymentalnych powstałych w wyniku czynnikowego układu krzyżowania „dent × flint”. Do oceny zróżnicowania genetycznego 17 linii wsobnych kukurydzy użyto markerów RAPD generowanych w oparciu o technikę PCR. Do powielania znaczników (markerów) wykorzystano 12 semi-specyficznych 18.-nukleotydowych starterów. Wyliczenie wartości współczynnika dystansu genetycznego Nei’a pomiędzy poszczególnymi badanymi liniami zostało przeprowadzone w oparciu o 404 polimorficzne fragmenty DNA. Wartości współczynników dystansu genetycznego wyliczono wg metody Nei & Li (1979). Większość wykorzystanych starterów generowała obrazy z wysokim udziałem fragmentów polimorficznych. Wartości współczynników dystansu genetycznego uzyskane dla par linii były stosunkowo wysokie i zawierały się w przedziale od 0,29 do 0,72. Analiza skupień przeprowadzona metodą średnich połączeń (UPGMA) wartości współczynników dystansu genetycznego dała podstawę do wyodrębnienia trzech różniących się między sobą grup linii kukurydzy; dwóch w obrębie linii o ziarnie zębokształtnym oraz jednej wspólnej dla linii szklistych. Średnia wartość współczynnika dystansu genetycznego w obrębie linii zębokształtnych wyniosła 0,56, natomiast w obrębie linii szklistych 0,46. Regresja plonów 70 mieszańców (dent × flint) względem dystansu genetycznego linii rodzicielskich tworzących ich formuły, wskazuje na bardzo słaby związek obu cech. Reasumując, przedstawiona metoda jest bardziej przydatna do poprawnego zaszeregowania linii do właściwej grupy heterotycznej niż do prognozowania wysokości plonu ziarna mieszańca na podstawie dystansu genetycznego pomiędzy liniami rodzicielskimi.
The main objective of the present study was to evaluate the genetic diversity of 17 (10 dent and 7 flint) inbred lines of maize in relation to yield performance of 70 hybrids produced according to North Carolina II design “dent × flint”. To assess genetic divergence among 17 inbred lines, random amplified polymorphic DNA (RAPD) molecular markers were used. Twelve different, primers consisting of 18 nucleotides were used to produce a total of 404 reproducible amplification DNA fragments, the majority of which were polymorphic. The values of genetic distance were calculated according to Nei & Li method (1979). The genetic distance among pairs of inbred lines ranged from 0.29 to 0.72. A dendrogram was constructed by an unweighted pair-group method using arithmetic averages (UPGMA). Cluster analysis divided the inbred lines into three groups: one including the flint lines only, and two groups composed of the dent type lines. The average value of genetic distance for pair comparison between the dent lines was higher (GD = 0.56) than that for the flint lines (GD = 0.46). Regression of hybrids grain yield on a genetic distance of their parental inbred lines showed very low correlation. The method used in this research is useful to allocate lines into a heterotic group rather than predict hybrid yield performance.
Źródło:
Biuletyn Instytutu Hodowli i Aklimatyzacji Roślin; 2009, 253; 231-243
0373-7837
2657-8913
Pojawia się w:
Biuletyn Instytutu Hodowli i Aklimatyzacji Roślin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High Performance Hybrid Silicon Evanescent Traveling Wave Electroabsorption Modulators
Autorzy:
Abedi, K.
Afrouz, H.
Powiązania:
https://bibliotekanauki.pl/articles/1399960.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
85.35.Be
Opis:
In this paper, for the first time, a high performance hybrid silicon evanescent traveling wave electroabsorption modulator based on asymmetric intra-step-barrier coupled double strained quantum wells active layer is introduced which has double steps at III/V mesa structure. Through this active layer, hybrid silicon evanescent traveling wave electroabsorption modulator will be advantages such as very low insertion loss, zero chirp, high extinction ratio, and large Stark shift and better figures of merit as compared with multiquantum well and intra-step quantum well structures. Furthermore, traveling wave electroabsorption modulator with double steps III/V mesa structure results in a wider bandwidth as compared with one-step III/V mesa and mushroom structures. For the modulator with double steps III/V mesa structure with a 200 μm length, the 3 dB bandwidths are obtained as 132 and 52 GHz for 25 and 40 Ω characteristic impedances, respectively.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 415-417
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hybrid modelling and performance evaluation of switched discrete-event systems
Autorzy:
Wang, L.
Powiązania:
https://bibliotekanauki.pl/articles/970351.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
układ zespolony
układ komutowany
modelowanie hybrydowe
zachowanie okresowe
ocena działania systemu
complex systems
switched systems
discrete event systems
max-plus algebra
hybrid modelling
periodic behavior
performance evaluation
Opis:
Motivated by the integrated complexity of real-time intelligent control and optimization of industrial/manufacturing processes, this paper discusses hybrid modelling and asymptotic periodic behavior of a class of switched discrete event systems, and shows how to evaluate the asymptotic performance/efficiency of such systems. We prove that, under some mild conditions, the switched discrete event system will achieve asymptotic periodic dynamics, and its performance/efficiency can be evaluated by calculating the eigenvalue of certain matrix in max-plus algebra. Illustrative examples are provided.
Źródło:
Control and Cybernetics; 2004, 33, 2; 311-321
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance of Hybrid Sensing Method in Environment with Noise Uncertainty
Autorzy:
Kustra, M.
Kosmowski, K.
Suchański, M.
Powiązania:
https://bibliotekanauki.pl/articles/308868.pdf
Data publikacji:
2018
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
Covariance Absolute Value
Cyclic Autocorrelation Function
hybrid detector
noise uncertainty
OFDM
SNR wall
WiMAX
Opis:
The paper presents a novel hybrid spectrum sensing method used in cognitive radio and presents a hybrid detector (HD) which improves the sensing performance. The proposed HD takes advantage of the energy detection (ED) principle and a method based on Covariance Absolute Value (CAV), as well as on Cyclic Autocorrelation Function (CAF). The paper shows the limitations of using ED, resulting from the uncertainty of spectral density of noise power estimation, known as the SNR wall. The paper describes a system model and presents simulation results for the OFDM signal of a WiMAX-based communications system. The simulation results refer to an ideal environment with well-known parameters, and to an environment with uncertain spectral density of noise power estimation.
Źródło:
Journal of Telecommunications and Information Technology; 2018, 1; 51-57
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Performance of Hybrid Constructed Wetland System for Treating the Batik Wastewater
Autorzy:
Rahmadyanti, Erina
Audina, Oktavia
Powiązania:
https://bibliotekanauki.pl/articles/123253.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
batik industry
wastewater
hybrid constructed wetland
Canna indica
Opis:
The batik industry is one of the Indonesian economic drivers. However, most of the batik industries discharge their wastewater without any prior treatment, thus endangering the environment. This research aims to investigate the ability of hybrid constructed wetlands (CWs) system using Canna indica in the batik wastewater treatment. The parameters studied were chemical oxygen demand (COD), total suspended solid (TSS), and oil and grease (FOG) with 3, 5, and 7 days of hydraulic retention time (HRT). The results indicate that the hybrid constructed wetland system using Canna indica optimally gains the COD and FOG removal efficiency on day 3 at 89.61% and 89.53%, while the TSS removal efficiency on day 5 at 98.74%. Despite the high removal efficiency, the effluent parameters remain below the standards for direct discharge into waterbodies. Therefore, further research is needed to investigate the appropriate pre-/advanced treatment to be combined with the hybrid constructed wetland in batik wastewater treatment.
Źródło:
Journal of Ecological Engineering; 2020, 21, 3; 94-103
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Flexural performance of hybrid fiber reinforced cement-based materials incorporating ceramic wastes
Autorzy:
Wu, Lipeng
Li, Xuanhao
Deng, Hai
Powiązania:
https://bibliotekanauki.pl/articles/27312153.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
materiał cementowy
odpad ceramiczny
wydajność mechaniczna
włókno polialkoholu winylowego
włókno stalowe
cement based material
ceramic waste
mechanical performance
polyvinyl alcohol fiber
steel fiber
Opis:
Ceramic waste generated by demolition and manufacturing processes is a kind of widely discharged solid waste; its sustainable use can reduce resource extraction, energy consumption, and carbon emissions, thereby reducing the environmental impact. In this study, ceramic powder and ceramic sand were prepared using waste ceramic wall tiles. By using three water-to-binder ratios of 0.30, 0.32, and 0.34, five ceramic powder replacement rates of 10% to 50%, and completely using ceramic sand as the fine aggregate, specimens with large differences in mechanical properties were prepared. Firstly, the compressive strength was investigated. On this basis, hybrid fibers were employed to strengthen the new matrix material, and its bending resistance was experimentally studied. It was found that the incorporation of ceramic powder reduced the compressive strength of the matrix. The water-binder ratio significantly affects compressive strength at an early age. The effect of PVA fiber on improving the ductility of the new composite is distinct. Increasing the amount of steel fiber can effectively enhance the bending bearing capacity.With a ceramic powder dosage of 50%, the new composite has shown ductile failure characteristics, even with low total fiber content. The bending properties of this new composite material, which makes extensive use of ceramic waste, are well adjustable. The bearing capacity and ductility balance can be achieved with the steel fiber content of 1% and the PVA fiber content of 1.2% to 1.50%.
Źródło:
Archives of Civil Engineering; 2023, 69, 3; 491--506
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental performance of a hybrid solar energy saving system in greenhouses
Autorzy:
Ntinas, G.
Kougias, P.
Nikita-Martzopoulou, C.
Powiązania:
https://bibliotekanauki.pl/articles/26431.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
experimental performance
hybrid
solar energy
saving system
greenhouse
energy saving
microclimate
tomato
Greece
crop production
rural production
Źródło:
International Agrophysics; 2011, 25, 3
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance comparison of hybrid electromagnetism-like mechanism algorithms with descent method
Autorzy:
Miyajima, H.
Shigei, N.
Powiązania:
https://bibliotekanauki.pl/articles/91563.pdf
Data publikacji:
2015
Wydawca:
Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Tematy:
electromagnetism-like mechanism
EM
meta-heuristcs
descent method
BP
k-means
FIS
hybrid EM method
metaheurystyka
metoda k-średnich
metoda hybrydowa EM
Opis:
Electromagnetism-like Mechanism (EM) method is known as one of metaheuristics. The basic idea is one that a set of parameters is regarded as charged particles and the strength of particles is corresponding to the value of the objective function for the optimization problem. Starting from any set of initial assignment of parameters, the parameters converge to a value including the optimal or semi-optimal parameter based on EM method. One of its drawbacks is that it takes too much time to the convergence of the parameters like other meta-heuristics. In this paper, we introduce hybrid methods combining EM and the descent method such as BP, k-means and FIS and show the performance comparison among some hybrid methods. As a result, it is shown that the hybrid EM method is superior in learning speed and accuracy to the conventional methods.
Źródło:
Journal of Artificial Intelligence and Soft Computing Research; 2015, 5, 4; 271-282
2083-2567
2449-6499
Pojawia się w:
Journal of Artificial Intelligence and Soft Computing Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Increased Performance of a Hybrid Optimizer for Simulation Based Controller Parameterization
Autorzy:
Neugebauer, R.
Hipp, K.
Hellmich, A.
Schlegel, H.
Powiązania:
https://bibliotekanauki.pl/articles/384707.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
controller parameterization
simulation based optimization
particle swarm optimization (PSO)
Nelder-Mead
Opis:
The controller parameterization is often carried out by applying basic empirical formulas within an integrated automatic design. Hence, the determined settings are often insufficiently verified by the resulting system behavior. In this paper an approach for the controller parameterization by using methods of simulation based optimization is presented. This enables the user to define specific restrictions e.g. the complementary sensitivity function (CSF) to influence the dynamic behavior of the control loop. Furthermore it is possible to choose alternative optimization criteria. A main influence factor for practical offline as well as controller internal optimization methods is the execution time, which can be reduced by applying a hybrid optimization strategy. Thus, the paper presents a performance comparison between the straight global Particle-Swarm-Optimization (PSO) algorithm and the combination of the global PSO with the local optimization algorithm of Nelder-Mead (NM) to a hybrid optimizer (HO) based on examples.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2012, 6, 1; 42-45
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance Analysis of Hybrid Phase Shift Keying over Generalized Nakagami Fading Channels
Autorzy:
Youssuf, M.
Abdelmageed, M. Z.
Powiązania:
https://bibliotekanauki.pl/articles/308527.pdf
Data publikacji:
2010
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
bit error rate
hybrid phase shift keying
quadrature phase shift keying
Opis:
In addition to the benefits of hybrid phase shift keying (HPSK) modulation in reducing the peak to average power ratio of the transmitted signal to reduce the zero cross- ings and the 0?-degree phase transmissions, HPSK enhances the bit error rate (BER) measure of the signal performance. The constellation of the HPSK is analyzed, and an expression for the conditional probability of HPSK modulation over additive white Gaussian noise (AWGN) is derived. This BER measure of HPSK is shown to outperform quadrature phase shift keying (QPSK) modulation. HPSK performance through Nakagami - m fading channel is also considered.
Źródło:
Journal of Telecommunications and Information Technology; 2010, 3; 77-82
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance investigation of hybrid photovoltaic thermal-heat with mini-channels for application in electric vehicles
Autorzy:
Strąk, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/24200857.pdf
Data publikacji:
2023
Wydawca:
Sieć Badawcza Łukasiewicz. Przemysłowy Instytut Motoryzacji
Tematy:
mini-channels
numerical simulations
one-dimensional model
autonomous car system with PVT
vehicle battery heat exchanger
Opis:
The first autonomous car was developed in the 1980s, but it wasn't until the early 2010s that the technology began to gain significant attention and investment. In 2010, Google began testing self-driving cars on public roads, and since then, many other companies have joined the race to develop fully autonomous vehicles. Hybrid PVT (Photovoltaic Thermal) heat exchangers cooled with mini-channels find application in autonomous vehicles as a solution that enables efficient cooling of the vehicle's electronics and batteries. The solution involves using photovoltaic panels to generate electricity and removing the heat produced during the process using mini-channels is removed by mini-channels. Hybrid PVT heat exchangers cooled with mini-channels can help maintain appropriate temperatures inside autonomous vehicles that generate large amounts of heat from electronic systems and sensors. The setup can improve the performance and reliability of autonomous systems, increase energy efficiency, and reduce energy demands. The experimental setup includes two parallel mini-channel systems separated by a smooth copper plate. The study aims to determine local heat-transfer coefficients, with a cooled solar cell efficiency range of 10% to 14% compared to other research. The cooled PV temperature range achieved was from 19.6 to 22.4 degrees Celsius, which is favorable for photovoltaic panels' operation under approximate light intensity for Poland's latitude. Heat-transfer from hot surfaces to cold fluids is analyzed during single-phase convection using two calculation methods: one-dimensional and numerical simulations using Simcenter STAR CCM+. Cooling photovoltaic modules is critical for the photovoltaic and autonomous vehicle systems sector, making this research significant both theoretically and practically. The research and methods presented in the article on mini-channel cooling of photovoltaic systems and autonomous vehicle systems are innovative at a global scale, and are crucial for further development of sustainable energy systems and reduction of greenhouse gas emissions.
Źródło:
Archiwum Motoryzacji; 2023, 100, 2; 5--30
1234-754X
2084-476X
Pojawia się w:
Archiwum Motoryzacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza stanów granicznych tarcz żelbetowych z otworami z betonu wysokowartościowego z dodatkiem włókien
Analysis of limit state of reinforced high performance hybrid fiber concrete deep beams with openings
Autorzy:
Smarzewski, P.
Spaczyńska, R.
Powiązania:
https://bibliotekanauki.pl/articles/391105.pdf
Data publikacji:
2012
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
elementy żelbetowe
fibrobeton wysokowartościowy
tarcze z otworami
reinforced concrete members
high performance fibre concrete
deep beams with openings
Opis:
W artykule przedstawiono analizy wytrzymałościowe tarcz z otworami wykonanych z betonu wysokowartościowego z dodatkiem włókien hybrydowych - stalowych i polipropylenowych. Porównano wyniki badań nośności na ścinanie z wartościami obliczonymi analitycznie na podstawie własnej propozycji oceny teoretycznej nośności elementów tarczowych powstałej przez modyfikacje wzorów empirycznych.
The article presents the analysis of the strength of reinforced deep beams with openings made of high performance hybrid fibre concrete – steel and polypropylene. We compared the results of the shear capacity of the analytically calculated values based on its own assessment of the theoretical capacity of the proposals deep beams members created by modifications of empirical formulas.
Źródło:
Budownictwo i Architektura; 2012, 10, 1; 27-36
1899-0665
Pojawia się w:
Budownictwo i Architektura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of Performance of Hybrid Photolysis-DCMD and Photocatalysis-DCMD Systems Utilizing UV-C Radiation for Removal of Diclofenac Sodium Salt From Water
Autorzy:
Mozia, S.
Darowna, D.
Przepiórski, J.
Morawski, A.W.
Powiązania:
https://bibliotekanauki.pl/articles/779272.pdf
Data publikacji:
2013
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
photocatalytic membrane reactor,
direct contact membrane distillation
photolysis
photocatalysis
diclofenac sodium salt
Opis:
The removal of a non-steroidal anti-inflammatory drug (NSAID) diclofenac sodium salt (DCF, C14H10Cl2NNaO2) from water in two hybrid systems coupling photolysis or photocatalysis with direct contact membrane distillation (DCMD) is presented. A UV-C germicidal lamp was used as a source of irradiation. The initial concentration of DCF was in the range of 0.005-0.15 mmol/dm3 and the TiO2 AeroxideŽ P25 loading (hybrid photocatalysis-DCMD) ranged from 0.05 to 0.4 g/dm3. Regardless of the applied hybrid system and the initial concentration of DCF, the model drug was completely decomposed within 4h of irradiation or less. Mineralization was less efficient than photodecomposition. In case of the hybrid photolysis-DCMD process the efficiency of TOC degradation after 5h of irradiation ranged from 27.3-48.7% depending on the DCF initial concentration. The addition of TiO2 allowed to improve the efficiency of TOC removal. The highest degradation rate was obtained at 0.3 gTiO2/dm3. During the process conducted with the lowest DCF initial concentrations (0.005-0.025 mmol/dm3) a complete mineralization was obtained. However, when higher initial amounts of DCF were used (0.05-0.15 mmol/dm3), the efficiency of TOC degradation was in the range of 82.5-85%. The quality of distillate was high regardless of the system: DCF was not detected, TOC concentration did not exceeded 0.7 mg/dm3 (1.9 mg/dm3 in permeate) and conductivity was lower than 1.6 žS/cm.
Źródło:
Polish Journal of Chemical Technology; 2013, 15, 1; 51-60
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of the natural gas price on industrial performance during a hybrid war
Wpływ ceny gazu ziemnego na wyniki przemysłu w czasie wojny hybrydowej
Autorzy:
Goncharuk, Anatoliy G.
Liashenko-Shcherbakova, Valeria
Chaika, Natalia
Powiązania:
https://bibliotekanauki.pl/articles/2048454.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:
natural gas
price change
performance indicators
hybrid war
industries
Ukraine
gaz ziemny
zmiana cen
wskaźniki efektywności
wojna hybrydowa
przemysł
Ukraina
Opis:
In the contemporary world, natural gas is one of the focuses of hybrid wars and is used as a tool of international economic and political pressure to gain appropriate benefits. The long-term pressure of Russia on Ukraine using a combination of military, political, economic, information and energy tools is one of the most striking cases of applying natural gas as a weapon in a hybrid war. Exploring the case of Ukraine, the authors confirmed the hypothesis about the change in the impact of the prices of natural gas on the performance of its industrial consumers during a hybrid war. The study covered three industrial sectors that are major consumers of natural gas – the metallurgy, chemical and pharmaceutical industries. The data of nine key companies of these industries for the period 2006–2019 were analyzed; this period was divided into two parts – before the hybrid war (2006–2013) and during it (2014–2019). The authors identified the heterogeneity of the influence of natural gas prices on the performance of different industrial enterprises. However, since the onset of the hybrid war, all of them have shown a reducing correlation of natural gas prices with all the analyzed performance indicators – operating profitability, material-output ratio, and labor productivity. The study managed to build reliable regression models that allow defining the prices of natural gas for the chemical industry and metallurgy, above which these industries in Ukraine become unprofitable. The defined critical levels have a practical implication since they can be tools for regulating natural gas prices for various industrial sectors.
We współczesnym świecie gaz ziemny jest jednym z narzędzi używanych w wojach hybrydowych i jest wykorzystywany do wywierania międzynarodowej presji gospodarczej i politycznej w celu uzyskania odpowiednich korzyści. Długotrwała presja Rosji na Ukrainę za pomocą kombinacji narzędzi militarnych, politycznych, ekonomicznych, informacyjnych i energetycznych jest jednym z najbardziej uderzających przypadków zastosowania gazu ziemnego jako broni w wojnie hybrydowej. Badając przypadek Ukrainy, autorzy potwierdzili hipotezę o wpływie zmian cen gazu ziemnego na wyniki jego odbiorców przemysłowych podczas wojny hybrydowej. Badanie objęło trzy sektory przemysłu, które są głównymi konsumentami gazu ziemnego – przemysł metalurgiczny, chemiczny i farmaceutyczny. Przeanalizowano dane dziewięciu kluczowych firm z tych branż za lata 2006–2019; okres ten został podzielony na dwie części – przed wojną hybrydową (2006–2013) i w jej trakcie (2014–2019). Autorzy zidentyfikowali niejednorodność wpływu cen gazu ziemnego na funkcjonowanie różnych przedsiębiorstw przemysłowych. Jednak od początku wojny hybrydowej wszystkie one wykazywały zmniejszającą się korelację cen gazu ziemnego ze wszystkimi analizowanymi wskaźnikami efektywności – rentownością operacyjną, relacją materiałów do produkcji oraz wydajnością pracy. W badaniu udało się zbudować wiarygodne modele regresji, które pozwalają określić ceny gazu ziemnego dla przemysłu chemicznego i hutniczego, powyżej których te branże na Ukrainie stają się nierentowne. Zdefiniowane progi mają praktyczne znaczenie, ponieważ mogą być narzędziami regulacji cen gazu ziemnego dla różnych sektorów przemysłu.
Źródło:
Polityka Energetyczna; 2021, 24, 4; 105-120
1429-6675
Pojawia się w:
Polityka Energetyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal efficiency and hydraulic performance evaluation on Ag–Al2O3 and SiC–Al2O3 hybrid nanofluid for circular jet impingement
Autorzy:
Datta, Abanti
Halder, Pabitra
Powiązania:
https://bibliotekanauki.pl/articles/1845498.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hybrid nanofluid
thermal performance factor
pumping power
merit number
Opis:
Hybrid nanofluids is obtained by dispersing more than one nanoparticle into a base fluid. The work is concerned with a detailed numerical investigation of the thermal efficiency and hydraulic performance of hybrid nanofluids for circular jet impinges on a round plate. For this paper, a metal (Ag), a metal oxides (Al2O3) and a metal carbides (SiC) nanoparticle and their water based hybrid nanofluids are considered to analyse numerically with varying significant dimensionless parameters, i.e., the jet-to-plate spacing ratio, Reynolds number and volume fraction of nanoparticles. The results demonstrated that the efficiency of heat transfer of all nanofluids is increased by the addition of nanoparticle to the dispersed in water at constant Reynolds number. Moreover, the results illustrate that heat transfer efficacy and pumping power penalty both increased as jet-to-plate spacing ratio reduced. The jet-to-plate spacing ratio equal to 4 is the best as the percentage enhance heat transfer is maximum in this situation. Since both the heat transfer effect and pumping penalty increase using hybrid nanofluids, thermal performance factor increases or decreases depends on nanoparticles of nanofluids. It is evident that the analysis of these hybrid nanofluids will consider both the increase in heat efficiency and the pumping capacity. The best flow behaviour is achieved for SiC–Al2O3 hybrid nanofluids. New merit number is introduced for additional clarification.
Źródło:
Archives of Thermodynamics; 2021, 42, 1; 163-182
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improving estimation accuracy of metallurgical performance of industrial flotation process by using hybrid genetic algorithm – artificial neural network (GA-ANN)
Autorzy:
Allahkarami, E.
Salmani Nuri, O.
Abdollahzadeh, A.
Rezai, B.
Maghsoudi, B.
Powiązania:
https://bibliotekanauki.pl/articles/109424.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
artificial neural network
genetic algorithm
prediction
copper flotation
Opis:
In this study, a back propagation feed forward neural network, with two hidden layers (10:10:10:4), was applied to predict Cu grade and recovery in industrial flotation plant based on pH, chemical reagents dosage, size percentage of feed passing 75 μm, moisture content in feed, solid ratio, and grade of copper, molybdenum, and iron in feed. Modeling is performed basing on 92 data sets under different operating conditions. A back propagation training was carried out with initial weights randomly mode that may lead to trapping artificial neural network (ANN) into the local minima and converging slowly. So, the genetic algorithm (GA) is combined with ANN for improving the performance of the ANN by optimizing the initial weights of ANN. The results reveal that the GA-ANN model outperforms ANN model for predicting of the metallurgical performance. The hybrid GA-ANN based prediction method, as used in this paper, can be further employed as a reliable and accurate method, in the metallurgical performance prediction.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 1; 366-378
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancing the performance of deep learning technique by combining with gradient boosting in rainfall-runoff simulation
Autorzy:
Abdullaeva, Barno S.
Powiązania:
https://bibliotekanauki.pl/articles/28411647.pdf
Data publikacji:
2023
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
deep learning
gradient boosting
hybrid model
multi-step ahead forecasting
rainfall-runoff simulation
Opis:
Artificial neural networks are widely employed as data mining methods by researchers across various fields, including rainfall-runoff (R-R) statistical modelling. To enhance the performance of these networks, deep learning (DL) neural networks have been developed to improve modelling accuracy. The present study aims to improve the effectiveness of DL networks in enhancing the performance of artificial neural networks via merging with the gradient boosting (GB) technique for daily runoff data forecasting in the river Amu Darya, Uzbekistan. The obtained results showed that the new hybrid proposed model performed exceptionally well, achieving a 16.67% improvement in determination coefficient (R2) and a 23.18% reduction in root mean square error (RMSE) during the training phase compared to the single DL model. Moreover, during the verification phase, the hybrid model displayed remarkable performance, demonstrating a 66.67% increase in R2 and a 50% reduction in RMSE. Furthermore, the hybrid model outperformed the single GB model by a significant margin. During the training phase, the new model showed an 18.18% increase in R2 and a 25% reduction in RMSE. In the verification phase, it improved by an impressive 75% in R2 and a 33.33% reduction in RMSE compared to the single GB model. These findings highlight the potential of the hybrid DL-GB model in improving daily runoff data forecasting in the challenging hydrological context of the Amu Darya River basin in Uzbekistan.
Źródło:
Journal of Water and Land Development; 2023, 59; 216--223
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance analysis between a hybrid force/position and conventional controllers for a wrist exoskeleton
Autorzy:
Avilés, Valeria
Avilés, Oscar F.
Aponte, Jorge
Caldas, Oscar I.
Mauledoux, Mauricio F.
Powiązania:
https://bibliotekanauki.pl/articles/2134891.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
exoskeleton
hybrid control
force
performance
position
Opis:
This study analyses the performances of various path controlling strategies for a 3-degrees of freedom wrist exoskeleton, by comparing key indicators, such as rise time, steady-state error, and implementation difficulty. A model was built to describe both system’s kinematics and dynamics, as well as 3 different controllers (PID, PD+, and a hybrid force/position controller) that were designed to allow each joint to perform smooth motions within anatomic ranges. The corresponding simulation was run and assessed via Matlab (version 2020a). In addition to the performance comparison, remarkable characteristics could be identified among controllers. PD+ showed higher response speed than the other controllers (about 4 times), and PID was reinforced as the technique with the easiest implementation due to the smallest matrices. The study also allowed to greater potential of the hybrid controller to interact with its environment, i.e., the robotic device.
Źródło:
Archives of Control Sciences; 2022, 32, 2; 409--427
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Hybrid Task-Based Language Teaching and Critical Thinking on Writing Performance in Indonesia
Autorzy:
Tusino, -
Faridi, Abdurrachman
Saleh, Mursid
Fitriati, Sri Wuli
Powiązania:
https://bibliotekanauki.pl/articles/1963612.pdf
Data publikacji:
2020-09-30
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
hybrid learning
task-based language teaching
critical thinking
writing performance
Opis:
This study aims to describe the effect of hybrid task-based language teaching and critical thinking skills on writing performance among Indonesian learners. This study employed experimental research with a factorial design. The participants were Indonesian undergraduate learners majoring in an English program. The instruments used were critical thinking questionnaires and writing tests in the genre-based writing course. The results of the study showed that hybridtask-based language teaching was effective for improving EFL learners’ writing performance. Also, it revealed that learners with high critical thinking achieved better writing performance than learners with low critical thinking after being taught by hybrid task-based language teaching. The results indicate that hybrid task-based language teaching and critical thinking have a significant effect on EFL writing performance.
Źródło:
The New Educational Review; 2020, 61; 109-118
1732-6729
Pojawia się w:
The New Educational Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Agronomic performance and heterosis of strawberry inbred hybrids obtained by top-cross mating system
Autorzy:
Kaczmarska, E.
Gawroński, J.
Powiązania:
https://bibliotekanauki.pl/articles/12619194.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
plant cultivation
strawberry
heterosis
plant hybrid
inbreeding
top-cross
mating system
agronomic performance
Opis:
The aim of this study was to develop an inbred lines from octoploid strawberry and to determine their breeding value by estimating the effects of general combining ability (GCA) and mid-parent heterosis. All inbred lines were obtained through selfing using five cultivars. The number of inflorescences, number of flowers per inflorescence, fruit yield, fruit number per plant, average fruit weight, number and weight of leaves as well as number of runners per plant were recorded from 2014 to 2015. The highest breeding value was estimated for maternal forms of ‘Senga Sengana’ 17 for six important traits. The lowest GCA effects were exhibited by inbred lines derived from clone 1387 18. Degree of heterosis for a given trait differed greatly among hybrids. The highest heterosis in terms of a number of inflorescences, fruit yield, number of fruits per plant and leaf weight occurred in the Kent 7-14 × ‘Dukat’ progeny. The results obtained could be used to evaluate the agronomic performance and to make more efficient choices of parents in current strawberry breeding programs
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2019, 18, 1; 85-97
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Porównanie technologii hybrydowych i natywnych do wytwarzania aplikacji mobilnych iOS
Comparison of hybrid and native iOS mobile application development technologies
Autorzy:
Kocki, Michał
Urban, Michał
Kopniak, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/24083477.pdf
Data publikacji:
2022
Wydawca:
Politechnika Lubelska. Instytut Informatyki
Tematy:
iOS
technologie natywne
technologie hybrydowe
wydajność
native technologies
hybrid technologies
performance
Opis:
Aplikacje mobilne dedykowane na system operacyjny iOS mogą być wytwarzane natywnie bądź hybrydowo. Tematyką artykułu jest porównanie tych technologii na przykładzie utworzonej aplikacji mobilnej. Zbadana została wydajność obu technologii na przykładzie dwóch urządzeń testowych i smartfona posiadającego system iOS. Biorąc pod uwagę analizę wydajności, został zbadany czas kompilacji aplikacji, odczyt i zapis danych z bazy danych w chmurze, a także czas sortowania odczytanych danych. Na urządzeniach testowych sprawdzono jak bardzo wytworzone aplikacje obciążają system. Otrzymane wyniki potwierdzają, że wytwarzanie aplikacji mobilnej w technologii natywnej jest wydajniejsze.
Mobile applications dedicated to iOS can be developed natively or hybrid. The subject of this paper is to compare these technologies on the example of a created mobile application. The performance of both technologies, the structure of projects, as well as resource consumption on the example of four smartphones operating under iOS, has been examined. Considering the performance analysis, the compilation time of the application, reading and writing data from the cloud database, as well as the time of sorting the read data was examined. On the test devices, it was checked how intense is the use of the system. The obtained results confirm that producing a mobile application in native technology is more performance efficient.
Źródło:
Journal of Computer Sciences Institute; 2022, 25; 280--287
2544-0764
Pojawia się w:
Journal of Computer Sciences Institute
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-mode switching control of hybrid electromagnetic suspension based on road conditions adaptation
Autorzy:
Meng, Xiangpeng
Ding, Renkai
Sun, Zeyu
Wang, Ruochen
Chen, Long
Powiązania:
https://bibliotekanauki.pl/articles/2055038.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
hybrid electromagnetic suspension
multi-mode switching control
road conditions
adaptation
dynamic performance
energy regeneration
Opis:
In this research, a hybrid electromagnetic actuator is proposed to coordinate the contradictions between dynamic performance and energy consumption of an electromagnetic suspension. The hybrid electromagnetic suspension (HEMS) is configured to operate in the passive energy regeneration mode, active control ride comfort mode or active control driving safety mode depending on the road excitation frequency. Then, the HEMS system is modeled. The simulation results show that the HEMS can automatically switch between different modes, and realize an effective coordination between dynamic performance and energy saving. Finally, a quarter car test is conducted, which verifies the effectiveness of the multi-mode switching control.
Źródło:
Journal of Theoretical and Applied Mechanics; 2020, 58, 3; 697--710
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study on performance of planing-wing hybrid craft
Autorzy:
Zeraatgar, Hamid
Rostami, Ali Bakhshandeh
Nazari, Abolfazl
Powiązania:
https://bibliotekanauki.pl/articles/259870.pdf
Data publikacji:
2012
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
hydrodynamics
ground effect
wing
planing
aerodynamics
VLM
Opis:
A hybrid craft is defined as a combination of different lifting surfaces. The lift force can be of aerodynamic or hydrodynamic character. This research deals with the conditions of using planing mono-hulls equipped with a couple of wings, called planing-wing hybrid craft. A parametric study is conducted by using Vortex Lattice Method to determine feasibility of using an aerodynamic wing mounted to planing craft. It has been determined that the wing area should be more than twice as much as the wetted surface of the craft, to get an effective wing for planing craft. Furthermore, the wing should be so designed as to obtain its high aspect ratio. Maximum lift force contribution resulting from different wing configurations considered in this study is less than 35 percent of the total hydrodynamic lift force at an arbitrary condition. On this basis it may be concluded that the wing may be effectively used only in special conditions, hence this is not recommended for general application.
Źródło:
Polish Maritime Research; 2012, 4; 16-22
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the performance of an aircraft powered by hybrid propulsion
Autorzy:
Majka, Andrzej
Muszyńska-Pałys, Jagoda
Powiązania:
https://bibliotekanauki.pl/articles/24202466.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
air transport
hybrid power unit
electric aircraft
Small Air Transport
SAT
aircraft emission
transport lotniczy
jednostka napędu hybrydowego
samolot elektryczny
emisja lotnicza
Opis:
Travel is an inseparable part of human life. It is connected not only with private life but also with business life. People want to travel more, farther and faster. That is why air transport is currently one of the fastest-growing areas of passenger transport, and airlines carry more and more passengers from year to year. Due to the growing negative impact of air transport on the natural environment, research aimed at the development of technologies to reduce the negative impact of air transport is becoming more and more important. One of the possibilities for improving the situation is the use of alternative energy sources, limiting the emission of greenhouse gases into the atmosphere. The paper aimed to analyze the meaningfulness of replacing the classic power unit in a light transport aircraft with a hybrid, combustion-electric power unit. Analyzes were made with the use of simulation methods for the PZL M-28 aircraft.
Źródło:
Combustion Engines; 2023, 62, 2; 45--51
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 55

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