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Tytuł:
Influences of porosity and tangential edge constraint on thermo-torsional postbuckling of FGM toroidal shell segments surrounded by an elastic medium
Autorzy:
Nhu Trang, L. T.
Van Tung, H.
Powiązania:
https://bibliotekanauki.pl/articles/38697106.pdf
Data publikacji:
2023
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
nonlinear buckling
porous FGM
toroidal shell segment
tangential edge constraint
torsional load
Opis:
For the first time, simultaneous influences of porosities, tangential constraints of boundary edges, surrounding elastic media and elevated temperature on the buckling and postbuckling behaviors of a functionally graded toroidal shell segment are investigated in this paper. Porosities exist in the functionally graded material (FGM) according to even and uneven distributions. Properties of constituent materials are assumed to be temperature dependent and effective properties of the porous FGM are determined using a modified rule of mixture. Governing equations are based on the classical shell theory taking into account geometrical nonlinearity and interactive pressure from surrounding elastic medium. Multi-term analytical solutions are assumed to satisfy simply supported boundary conditions and the Galerkin method is adopted to derive nonlinear load – deflection relations and buckling loads. Parametric studies are carried out to analyze the effects of porosity, shell geometry, degree of tangential edge constraint, elevated temperature and elastic media on the buckling resistance and postbuckling strength of toroidal shell segments under a torsional load. The study reveals that tangential edge restraints have considerably beneficial and detrimental influences on the nonlinear stability of torsion-loaded FGM shells at room and elevated temperatures, respectively. The results also find out that the shear layer and the elastic layer of surrounding medium significantly enhances and alleviates the buckling resistance capacity and severity of the snap-through response of the torsion-loaded porous FGM toroidal shell segment, respectively.
Źródło:
Archives of Mechanics; 2023, 75, 4; 401-429
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Projekt silnika elektrycznego do zabudowy w piaście koła dostawczego hybrydowego samochodu o masie do 3,5 t
Design of a wheel hub motor for a hybrid delivery van with a weight not exceeding 3.5 tons
Autorzy:
Dukalski, Piotr
Mikoś, Jan
Krok, Roman
Powiązania:
https://bibliotekanauki.pl/articles/2142548.pdf
Data publikacji:
2022
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
silnik w piaście koła
silnik z magnesami trwałymi
samochód elektryczny
napęd elektryczny
wheel hub motor
permanent magnet motor
electric car
electric drive
Opis:
W artykule autorzy zaprezentowali model silnika elektrycznego do zabudowy w piaście koła samochodu dostawczego o masie do 3,5 t. Przedstawiono wyniki symulacji pracy silnika w napędzie złożonym z dwóch silników zabudowanych w tylnej osi napędowej pojazdu. Symulacje zostały przeprowadzone dla założonego cyklu jazdy Artemis Urban, który odwzorowuje cykl miejski z uwzględnieniem przeciętnej dynamiki jazdy. Obliczenia zostały przeprowadzone w programie Ansys Motor-CAD, który pozwala na sprzężenie modelu elektromagnetycznego oraz modelu termicznego obwodu elektromagnetycznego silnika Zaprezentowano wyniki obliczeń temperatury poszczególnych elementów oraz parametrów pracy silnika przy symulacji jazdy miejskiej.
In the article, the authors presented a model of an electric wheel hub motor of a delivery vehicle weighing up to 3.5 tons. The article presents the results of simulating the operation of the motor in a drive consisting of two motors, installed in the rear driving axle of the vehicle. The simulations were carried out for the assumed Artemis Urban driving cycle, which represents the urban cycle, taking into account the average driving dynamics. The calculations were carried out in the Ansys Motor-CAD program, which allows to perform calculations on coupled models of the electromagnetic and thermal circuit. The calculated operating temperatures of individual motor components and operating parameters during the simulation of urban driving are presented.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2022, 3, 1 (127); 135--145
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diversity, distribution and threats of the Juglandaceae in Vietnam
Autorzy:
Van Sam, H.
Quang Tung, D.
Jasinska, A.K.
Rion, F.
Tuyen, P.T.
Ngoc, D.T.B.
Tam, D.T.
Bétrisey, S.
Song, Y.G.
Kozlowski, G.
Powiązania:
https://bibliotekanauki.pl/articles/2078269.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
Conservation biology
relict trees
Rhoiptelea
Engelhardia
Alfaropsis
Opis:
Vietnam is one of the main centers of generic diversity for Juglandaceae worldwide. In this study, we present for the first time a province-wide distribution of all 3 subfamilies, 7 genera, and 11 Vietnamese species, and give an update on the habitats of all Vietnamese Juglandaceae species, their uses, and current threats. Juglandaceae are found throughout Vietnam. However, most species occur predominantly in the north- ern part of the country between 600 and 1200 m. Some taxa range is found extensively from sea level up to 2,500 meters above sea level. According to the IUCN Red List, Rhoiptelea chiliantha, Carya sinensis, and Pterocarya tonkinensis are threatened while Engelhardia spicata, E. serrata, Alfaropsis roxburghiana, Pterocarya stenoptera are classified as least concerned (Carya tonkinensis is threatened locally, and Engelhardia spicata var. colebrookiana and Platycarya strobilacea merit “threatened” designation in Vietnam’s Red Data Book. The most frequent threats are logging, land-use change, and habitat destruction due to artificial wood planta- tions or road construction. Until now, no conservation measures have been applied for any of the species in Vietnam, although some species occur in national parks. Our study gives an important update on the current diversity and distribution of Juglandaceae in Vietnam. We point out the need for a correct assessment of the threat status of various species on a national and international scale to protect the rarest and most endangered of them. Further research, the use of various forms of protection of individual taxa and/or their habitats, and drawing the attention of an international group of researchers to the urgent need to work together to protect biodiversity in Vietnam hot spots are necessary.
Źródło:
Dendrobiology; 2021, 86; 39-55
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przemysław Wątroba, Rysunki architektoniczne i dekoracyjne. Tylman van Gameren, t. 1-2, Warszawa 2019 (Katalog Zbiorów - Gabinet Rycin Biblioteki Uniwersyteckiej w Warszawie)
Przemysław Wątroba, Rysunki architektoniczne i dekoracyjne. Tylman van Gameren [Przemysław Wątroba, Architectural and Decorative Drawings. Tylman van Gameren], Vols. 1-2, Warszawa 2019 (Print Cabinet at the Library of the University of Warsaw. Collection
Autorzy:
Mossakowski, Stanisław
Powiązania:
https://bibliotekanauki.pl/articles/23944994.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Sztuki PAN
Tematy:
Tylman van Gameren
Opis:
Recenzja książki Przemysława Wątroby, Rysunki architektoniczne i dekoracyjne. Tylman van Gameren, t. 1-2, Warszawa 2019.
Źródło:
Biuletyn Historii Sztuki; 2021, 83, 2; 427-430
0006-3967
2719-4612
Pojawia się w:
Biuletyn Historii Sztuki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorption of Congo Red Dye Using Rice Husk
Autorzy:
Omokpariola, Daniel Omeodisemi
Otuosorochi, Joy Njoku
Powiązania:
https://bibliotekanauki.pl/articles/1031769.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Congo red
Freundlich model
Langmuir models
Rice husks powder
Van’t Hoff equation
adsorption
kinetics
thermodynamics
Opis:
The potential of rice husks powder (RHP), for the removal of Congo red dye from aqueous solution was investigated. Batch adsorption studies were conducted and various parameters such as contact time, adsorbent dosage, initial dye concentration, pH and temperature were studied to observe their effects in the dye adsorption process. The optimum conditions for the adsorption of CR onto the adsorbent (RHP) was found to be: contact time (100 min) pH (10.0) and temperature (303 K) for an initial dye concentration of 50 mg/l and adsorbent dose of 1.0 g respectively. The experimental equilibrium adsorption data fitted best and well to the Freundlich Isotherm model for both dyes adsorption. The maximum adsorption capacity was found to be 33.88 mg/g for the adsorption of CR dye. The kinetic data conformed to the pseudo second order kinetic model. Thermodynamic quantities such as Gibbs free energy (ΔGº), enthalpy (ΔHº) and entropy (ΔSº) were evaluated and the negative values of ΔGº, ΔHº and ΔSº obtained indicate the spontaneous and exothermic nature of the adsorption process.
Źródło:
World Scientific News; 2020, 150; 22-38
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of hydrogen peroxide and lead(II) nitrate on gold cyanide leaching of Malaysian mesothermal deposit gold ore
Autorzy:
Baharun, Norlia
Ling, Ong Pek
Ardani, Mohammad Rezaei
Ariffin, Kamar Shah
Powiązania:
https://bibliotekanauki.pl/articles/1845218.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
gold cyanidation
mesothermal lode gold
statistical analysis
design of experiment
Van’t Hoff differential method
Opis:
The gold extraction from Malaysian mesothermal lode gold ore through the cyanidation method was performed. The effect of hydrogen peroxide (H2O2) and lead nitrate Pb(NO3)2 were investigated on the percentage of gold recovery. The statistical analysis method using a response surface design-central composite design was applied to find the optimum condition for gold extraction. The studied parameters were NaCN concentration (300-500 ppm), H2O2 concentration (205-410 ppm), and Pb(NO3)2 concentration (50-150 ppm). It was found that increasing the amount of NaCN and H2O2 as well as decreasing the amount of Pb(NO3)2 in the studied range, increased the gold recovery. The analysis of variance suggested the linear model for the gold extraction with the optimum condition at 467.3 ppm NaCN, 94.96 ppm Pb(NO3)2, and 340 ppm H2O2. The gold extracted from the ore at the optimum condition was 88.97% as compared to 62.02% from conventional cyanidation. The characterization study of the gold ore indicated that the finely gold particles interlocked in the aluminosilicate phase (grain size of ~10.0 μm). The Van’t Hoff differential method justified that the cyanidation was of second order with a specific reaction rate of 0.0501/hour.
Źródło:
Physicochemical Problems of Mineral Processing; 2020, 56, 5; 905-918
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Elaborar ayates. El trabajo artesanal hñähñu del hilado y tejido en el Valle del Mezquital, México
Autorzy:
Reyes-Samilpa, Alicia
van ´t Hooft, Anuschka
Antonio Reyes-Agüero, Juan
de la Borbolla, Sol Rubín
Powiązania:
https://bibliotekanauki.pl/articles/2079267.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Warszawski. Wydział Neofilologii
Tematy:
conocimiento tradicional
ixtle
hilar y tejer
malacate
telar de cintura
Opis:
En este trabajo se presenta una descripción de la elaboración de ayates con la fibra de maguey tal y como se realiza en comunidades hñähñu en el Valle del Mezquital en el estado de Hidalgo, México. Desde una perspectiva etnográfica en la que se consideran las observaciones y las pláticas informales como herramientas principales, se describen tanto los componentes de los instrumentos más importantes (malacate, urdidera y telar de cintura) como las técnicas del hilado con thet’i o malacate, y del tejido del ixtle (fibra de maguey) en el ya’be ga ñhu’ti o telar de cintura. Con base en las condiciones socio-ecológicas del entorno, se presenta el conocimiento tradicional del trabajo artesanal de los hñet’í o hilanderos y las met’e o tejedoras de esta región. Con ello se contribuye a la investigación del trabajo textil en esta región, el cual ha sido poco estudiado a pesar de que sus técnicas y piezas textiles son de las más variadas en Mesoamérica.
Źródło:
Itinerarios; 2020, 31; 267-291
1507-7241
Pojawia się w:
Itinerarios
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phytochemical composition and antibacterial activity of ethanolic extract from trunk of Rothmannia wittii (Craib) Bremek. (Rubiaceae) newly found in Vietnam
Autorzy:
Van, H.T.
Nguyen, T.T.
Ton, H.T.T.
Dinh, K.T.T.
Le, V.S.
Pham, T.V.
Tran, G.B.
Powiązania:
https://bibliotekanauki.pl/articles/2096309.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Rothmannia wittii
extract
phytochemical composition
antibacterial activity
LC-MS
Opis:
Rothmannia wittii, which is found in Binh Chau-Phuoc Buu Nature Reserve, Bung Rieng ward, Xuyen Moc District, Ba Ria-Vung Tau Province, Vietnam, is a rare species of Rubiaceae family. The present study aimed to determine the phytochemical composition and antimicrobial activity of the ethanolic extract of the R. wittii trunk. A total of 10 compounds were identified by liquid chromatography-mass spectrophotometry (LC-MS), including 1) benzene, 1-(1,5-dimethyl-4- hexenyl)-4-methyl, 2) diphenylsulfone, 3) 6β-hydroxy-10-O-acetylgenipin, 4) cinnamyl-cinnamate, 5) genipin, 6) megastigmatrienone, 7) ethyl p-methoxy-trans-cinnamate, 8) rothalazepane, 9) 1,3,6-trimethylpyrano[2,3-d ]imidazole-2,5(1H,3H)-dione, and 10) shanzhiol. The extract also exhibited an antibacterial activity against six bacterial strains: Bacillus cereus, Pseudomonas aeruginosa, Escherichia coli, Staphylococcus aureus, Salmonella typhimurium and Salmonella enteritidis, as determined via disk diffusion agar method.
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2020, 101, 4; 301-307
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sequence of post-moult exoskeleton hardening preserved in a trilobite mass moult assemblage from the Lower Ordovician Fezouata Konservat-Lagerstätte, Morocco
Autorzy:
Drage, H.B.
Vandenbroucke, T.R.A.
Van Roy, P.
Daley, A.C.
Powiązania:
https://bibliotekanauki.pl/articles/20934.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:
Euarthropods have a tough exoskeleton that provides crucial protection from predation and parasitism. However, this is restrictive to growth and must be periodically moulted. The moulting sequence is well-known from extant arthropods, consisting of: (i) the long inter-moult stage, in which no changes occur to the hardened exoskeleton; (ii) the pre-moult stage where the old exoskeleton is detached and the new one secreted; (iii) exuviation, when the old exoskeleton is moulted; and (iv) the post-moult stage during which the new exoskeleton starts as soft, thin, and partially compressed and gradually hardens to the robust exoskeleton of the inter-moult stage. Trilobite fossils typically consist of inter-moult carcasses or moulted exuviae, but specimens preserving the post-moult stage are rare. Here we describe nine specimens assigned to Symphysurus ebbestadi representing the first group of contemporaneous fossils collected that preserve all key stages of the moulting process in one taxon, including the post-moult stage. They were collected from a single lens in the Tremadocian part of the Fezouata Shale Formation, Morocco. Based on cephalic displacement and comparison to other trilobite moults, one specimen appears to represent a moulted exoskeleton. Four specimens are typical inter-moult carcasses. Four others are wrinkled and flattened, with thin exoskeletons compared to inter-moult specimens, and are considered post-moult individuals. These S. ebbestadi specimens illuminate the preservation and morphology of the post-moulting stage, characterised by strong anterior-posterior exoskeleton wrinkling, as well as overall body flattening and reduced visibility of thoracic articulations. Being found in the same lens, these specimens likely represent the first preserved in-the-act mass moulting event. The displayed sequence of moulting suggests the moulting process in trilobites was comparable to modern arthropods, and conserved within euarthropod evolutionary history.
Źródło:
Acta Palaeontologica Polonica; 2019, 64, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza retencji wybranych testowych związków chemicznych w kolumnie wypełnionej żelem krzemionkowym modyfikowanym grupami aminowymi
Retention behavior of selected test compounds using column filled with silica gel modified by amine groups
Autorzy:
Ziobrowski, P.
Chutkowski, M.
Zapała, L.
Zapała, W.
Powiązania:
https://bibliotekanauki.pl/articles/92234.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
chromatografia oddziaływań hydrofilowych
retencja
faza ruchoma
równanie van’t Hoffa
zależność van Deemtera
hydrophilic interaction liquid chromatography
retention
mobile phase
van’t Hoff equation
Van Deemter's dependence
Opis:
W niniejszej pracy zbadano wpływ składu fazy ruchomej oraz temperatury na proces retencji trzech testowych związków chemicznych: kofeiny, kwercetyny oraz fenolu w chromatografii oddziaływań hydrofilowych (HILIC). Określono także ogólną sprawność kolumny dla badanych związków w układach z fazami ruchomymi zawierającymi 70 i 90% [V/V] rozpuszczalnika organicznego. Badania przeprowadzono w kolumnie wypełnionej żelem krzemionkowym modyfikowanym grupami aminowymi. Temperaturę zmieniano w zakresie od 20 do 50°C, natomiast objętościowe natężenie przepływu eluentów w zakresie 0,05 do 3 [cm3 /min]. Otrzymane zależności wykazały istotny wpływ zarówno składu fazy ruchomej jak i temperatury na mechanizm retencji związków testowych. Wykazano także wysoką sprawność kolumny w przypadku badanych układów.
In this work, the influence of the composition of mobile phase and temperature on the retention process of three test compounds: caffeine, quercetin and phenol in hydrophilic interaction chromatography (HILIC) were analyzed. The overall efficiency of the column for the tested compounds was also determined in eluent systems with 70 and 90% [V/V] of organic modifier. The tests were carried out using column filled with the stationary phase being silica gel modified by amine groups. Temperature was varied in the range from 20 to 50°C, while the flow rate was set in the range from 0.05 to 3 [cm3/min]. The obtained dependences showed a significant influence of both the composition of the mobile phase and temperature on the retention mechanism of the test chemicals. High efficiency of the column in the investigated systems was also confirmed.
Źródło:
Camera Separatoria; 2018, 10, 2; 43-51
2083-6392
2299-6265
Pojawia się w:
Camera Separatoria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of contamination in Namson Landfill, Hanoi, Vietnam by hydrogeophysical methods
Ocena stopnia skażenia terenu na obszarze składowiska odpadów Namson w Hanoi (Wietnam) z wykorzystaniem metod hydro-geofizycznych
Autorzy:
Van Giang, N.
Vu, N. T.
Duan, N. B.
Powiązania:
https://bibliotekanauki.pl/articles/218928.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
obrazowanie elektrooporowe
metoda potencjałów własnych
badanie elektromagnetyczne bardzo niskich częstotliwości (VLF)
electrical resistivity tomography
self-potential
hydrogeophysics
NamSon waste site
Opis:
The main objective of this study was to assess the environmental impact of the subsurface geological structure in Nam Son landfill by hydrogeophysical method. The Electrical Resistivity Tomography (ERT), Self-Potential (SP) and Very Low Frequency (VLF) method was used for geological structure investigation. Three profiles (total 900 m long) of two-dimensional ERT, VLF density sections and 180 SP data points scattered within the study area near the disposal site were implemented. Surface water and groundwater samples were collected from 10 sites in the area for hydrochemical analysis. Interpretations of geophysical data show a low resistivity zone (<15 Ω m), which appears to be a fully saturated zone with leachate from an open dumpsite. There is a good correlation between the geophysical investigations and the results of hydrochemical analysis.
Podstawowym celem pracy było określenie stopnia oddziaływania na środowisko w podpowierzchniowych warstwach geologicznych na obszarze składowiska odpadów Nam Son przy wykorzystaniu metod hydro-geofizycznych. W badaniach budowy geologicznej terenu wykorzystano metodę obrazowania elektrooporowego (Electrical Resistivity Tomography – ERT), metodę potencjałów własnych (Self-Potential – SP) oraz badania elektromagnetyczne bardzo niskich częstotliwości (Very Low Frequency – VLF). Wytypowano trzy profile (o całkowitej długości 900 m) do dwuwymiarowego obrazowanie ERT oraz siatki gęstości do badania elektromagnetycznego VLF oraz 180 rozproszonych punktów do badań metodą potencjałów własnych na badanym terenie. Próbki wód powierzchniowych i gruntowych do analizy chemicznej pobrano z 10 lokalizacji na terenie składowiska. Interpretacja danych geofizycznych wykazała istnienie strefy charakteryzującej się niskimi oporami (<15 Ω), w pełni nasyconej odpadami ciekłymi wypłukiwanymi z otwartego składowiska. Stwierdzono wysoki poziom korelacji pomiędzy rezultatami badań geofizycznych a wynikami analiz chemicznych.
Źródło:
Archives of Mining Sciences; 2018, 63, 2; 397-416
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dumpstones as records of overturning ice rafts in a Weichselian proglacial lake (Rügen Island, NE Germany)
Autorzy:
Pisarska-Jamroży, M.
Van-Loon, A. J. T.
Bronikowska, M.
Powiązania:
https://bibliotekanauki.pl/articles/2060089.pdf
Data publikacji:
2018
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
dumpstones
dropstones
ice-rafted debris
Weichselian
glaciolacustrine sediments
Opis:
Dumpstones and dropstones up to 0.8 m in size occur in a silty/sandy Weichselian glaciolacustrine succession near Dwasieden on Rügen Island in the SW Baltic Sea (NE Germany). The deposits are exceptional because two levels of dumpstones and dropstones are present, suggesting two dumping phases interrupting characteristic fine-grained glaciolacustrine sedimentation. Plastic downwarping of sediments below the dumpstones and dropstones result in soft-sediment deformation structures. The distribution and orientation of the long axes of the clasts are useful tools for the reconstruction of the state of the lake bottom, as well as for the water depth. The horizontal position of the gravels and boulders (parallel to the bedding) suggests deposition in relatively shallow-water. The dumping events are linked to iceberg rafting in a glacial lake during the Weichselian Glaciation (MIS 2).
Źródło:
Geological Quarterly; 2018, 62, 4; 917-924
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experience Report: Towards Extending an OSEK-Compliant RTOS with Mixed Criticality Support
Autorzy:
Gupta, T.
Luit, E. J.
van den Heuvel, M. M. H. P.
Bril, R. J.
Powiązania:
https://bibliotekanauki.pl/articles/384148.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
OSEK
RTOS
mixed criticality
real-time operating system
Opis:
Background: With an increase of the number of features in a vehicle, the computational requirements also increase, and vehicles may contain up to 100 Electronic Control Units (ECUs) to accommodate these requirements. For cost-effectiveness reasons, amongst others, it is considered desirable to limit the growth of, or preferably reduce, the number of ECUs. To that end, mixed criticality is a promising approach that received a lot of attention in the literature, primarily from a theoretical perspective. Aim: In this paper, we address mixed criticality from a practical perspective. Our prime goal is to extend an OSEK-compliant real-time operating system (RTOS) with mixed criticality support, enabling such support in the automotive domain. In addition, we aim at a system (i) supporting more than two criticality levels; (ii) with minimal overhead upon an increase of the so-called criticality level indicator of the system; (iii) requiring no changes to an underlying operating system; and (iv) featuring further extensions, such as hierarchical scheduling and multi-core. Method: We used the so-called adaptive mixed criticality (AMC) scheme as a starting point for mixed criticality. We extended that scheme from two to more than two criticality levels (satisfying (i)) and complemented it with specified behavior for criticality level changes. We baptized our extended scheme AMC*. Rather than selecting a specific OSEK-compliant RTOS, we selected ExSched, an operating system independent external CPU scheduler framework for real-time systems, which requires no modifications to the original operating system source code (satisfying (iii)) and features further extensions (satisfying (iv))). Results: Although we managed to build a functional prototype of our system, our experience with ExSched made us decide to rebuild the system with a specific OSEK-compliant RTOS, being µC/OS-II. We also briefly report upon our experience with AMC* and suggest directions for improvements. Conclusions: Compared to extending ExSched with AMC*, extending µC/OS-II turned out to be straightforward. Although we now have a basic system operational and available for experimentation, enhancements of the AMC*-scheme are considered desirable before exploitation in a vehicle. Background: With an increase of the number of features in a vehicle, the computational requirements also increase, and vehicles may contain up to 100 Electronic Control Units (ECUs) to accommodate these requirements. For cost-effectiveness reasons, amongst others, it is considered desirable to limit the growth of, or preferably reduce, the number of ECUs. To that end, mixed criticality is a promising approach that received a lot of attention in the literature, primarily from a theoretical perspective. Aim: In this paper, we address mixed criticality from a practical perspective. Our prime goal is to extend an OSEK-compliant real-time operating system (RTOS) with mixed criticality support, enabling such support in the automotive domain. In addition, we aim at a system (i) supporting more than two criticality levels; (ii) with minimal overhead upon an increase of the so-called criticality level indicator of the system; (iii) requiring no changes to an underlying operating system; and (iv) featuring further extensions, such as hierarchical scheduling and multi-core. Method: We used the so-called adaptive mixed criticality (AMC) scheme as a starting point for mixed criticality. We extended that scheme from two to more than two criticality levels (satisfying (i)) and complemented it with specified behavior for criticality level changes. We baptized our extended scheme AMC*. Rather than selecting a specific OSEK-compliant RTOS, we selected ExSched, an operating system independent external CPU scheduler framework for real-time systems, which requires no modifications to the original operating system source code (satisfying (iii)) and features further extensions (satisfying (iv))). Results: Although we managed to build a functional prototype of our system, our experience with ExSched made us decide to rebuild the system with a specific OSEK-compliant RTOS, being µC/OS-II. We also briefly report upon our experience with AMC* and suggest directions for improvements. Conclusions: Compared to extending ExSched with AMC*, extending µC/OS-II turned out to be straightforward. Although we now have a basic system operational and available for experimentation, enhancements of the AMC*-scheme are considered desirable before exploitation in a vehicle.
Źródło:
e-Informatica Software Engineering Journal; 2018, 12, 1; 305-320
1897-7979
Pojawia się w:
e-Informatica Software Engineering Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fuel continuous mixer - an approach solution to use straight vegetable oil for marine diesel engines
Autorzy:
Van Uy, D.
The Nam, T.
Powiązania:
https://bibliotekanauki.pl/articles/117233.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
fuel continuous mixer
straight vegetable oil
marine desel engine
ship operation
green fuel
mixed fuel
Vietnam Maritime University
diesel engine
Opis:
The vegetable oil is well known as green fuel for diesel engines due to its low sunphur content and renewable stock. However, there are some problems raising when vegetable oil is used as fuel for diesel engines such as highly effected by cold weather, lower general efficiency, separation in layer if mixed with diesel oil and so on. To overcome that disadvantiges, the authors propose a new idea that to use a continuous fuel mixer to blend vegetable oil with diesel oil to make so called a mixed fuel supplying to diesel engines inline. In order to ensure a quality of the mixed fuel created by continuous mixer, a homogeneous testing was introduced with believable results. Then, the continuous mixer has been installed into fuel supply system of diesel engine 6LU32 at a lab of Vietnam Maritime University in terms of checking a real operation of the fuel continuous mixer with diesel engine.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 1; 151-157
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of Vietnamese Ochna integerrima (Lour.) merr species based on ribosomal DNA internal transcribed spacer sequence
Autorzy:
Trang, D.H.
Van Dong, D.
Chung, B.H.
Gioi, D.H.
Khanh, T.D.
Powiązania:
https://bibliotekanauki.pl/articles/11712.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Źródło:
International Letters of Natural Sciences; 2018, 68
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
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