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    Wyświetlanie 1-14 z 14
    Tytuł:
    Chemical Effects on the K$\text{}_{β}$/K$\text{}_{α}$ Intensity Ratios in First-Row Transition Element Compounds
    Autorzy:
    Küçükönder, A.
    Büyükkasap, E.
    Yilmaz, R.
    Şahin, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/1994736.pdf
    Data publikacji:
    1999-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.-g
    82.80.-d
    Opis:
    Chemical Effects on the K$\text{}_{β}$/K$\text{}_{α}$ X-ray Intensity Ratios for Some First-row Transition Element Compounds Were Studied Experimentally and Calculated. the Vacancies in the K Shell Were Created by 59.5 keV γ rays from an $\text{}^{241}$Am Radioactive Source and Characteristic X-ray Radiation from Sample Was Measured by Using Si(li) and Ge(li) Detectors. the Calculations Were Carried Out Using Brunner's Model. the Calculated Relative K$\text{}_{β}$/K$\text{}_{α}$ X-ray Intensity Ratios Are in Good Agreement with the Present and the Previously Published Experimental Data.
    Źródło:
    Acta Physica Polonica A; 1999, 95, 2; 243-250
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of element contents in haricot beans grown under organic and conventional farming regime for human nutrition and health
    Porównanie zawartości pierwiastków w roślinach fasoli szparagowej uprawianych w systemie organicznym i konwencjonalnym w celach spożywczych i leczniczych
    Autorzy:
    Akbaba, U.
    Şahin, Y.
    Türkez, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/11542362.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Opis:
    Today, sustainable agriculture and food content is a very important issue in the world. Organic farming practices are very important in this respect.This study was made to observe the impact of organic agricultural regime on the products in case of haricot beans (Phaseolus vulgaris L.). A comparative study on elemental composition of various haricot beans (Phaseolus vulgaris L.) samples was conducted by using a sensitive method, wavelength dispersive X-ray fluorescence (WDXRF). 26 elements such as Al, Ca, Cu, Fe, As, Hg, Pb, Cd, Bi, Mn, Ni, P, S, Sr, Zn, Zr, La, Ti, Sn, Cl, K, Mg, Na, Ba, Rb and Si were determined in haricot beans samples (n=10) grown under organic and conventional farming regimes. The obtained results from each group were analyzed statistically by using SPSS statistic program. It was observed that the concentration and peak intensity values of Ca, Fe, Mn, P, Zn, Cl, K, Na, Mg and Si elements were higher in the haricot beans samples grown under organic farming regime. Likewise, Al and Sr levels were found in higher levels in the samples grown under conventional farming regime. Our findings clearly revealed that organic haricot beans are likely to have higher nutritional mineral content. And the haricot beans samples grown under conventional farming regime could contain harmful metals like Al and Sr that might damage the various systems and/or organs of humans and animals.
    Obecnie rolnictwo nienaruszające równowagi ekologicznej oraz wartość żywności stanowią sprawę istotną dla całego świata. Praktyki uprawy ekologicznej mają w tej kwestii duże znaczenie. Celem niniejszej pracy jest obserwacja wpływu systemu rolnictwa organicznego na produkty, na przykładzie fasoli szparagowej (Phaseolus vulgaris L.). Przeprowadzono badanie porównawcze składu pierwiastkowego (chemicznego) różnych próbek fasoli szparagowej (Phaseolus vulgaris L.) czułą metodą fluorescencji rozpraszającej długość fali promieniami Roentgena (WDXRF). 26 pierwiastków, takich jak: Al, Ca, Cu, Fe, As, Hg, Pb, Cd, Bi, Mn, Ni, P, S, Sr, Zn, Zr, La, Ti, Sn, Cl, K, Mg, Na, Ba, Rb oraz Si oznaczono w próbkach fasoli szparagowej (n = 10) uprawianej systemem organicznym i tradycyjnym. Otrzymane wyniki z każdej grupy poddano analizie statystycznej z wykorzystaniem programu statystycznego SPSS. Zaobserwowano, że wartości stężenia I szczytowej intensywności pierwiastków Ca, Fe, Mn, P, Zn, Cl, K, Na, Mg oraz Si były wyższe w próbkach fasoli szparagowej uprawianej systemem organicznym. Stwierdzono także wyższy poziom Al i Sr w próbkach uprawianych zgodnie z systemem konwencjonalnym. Nasze wyniki wyraźnie wykazały, że uprawiana organicznie fasola szparagowa prawdopodobnie zawiera więcej mineralnych składników odżywczych, zaś uprawiana zgodnie z systemem konwencjonalnym może zawierać szkodliwe metale, takie jak Al i Sr, mogące uszkadzać różne narządy i/lub układy w organizmach ludzi i zwierząt.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2012, 11, 2; 117-125
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Particle Impact Angle, Erodent Particle Size and Acceleration Pressure on the Solid Particle Erosion Behavior of 3003 Aluminum Alloy
    Autorzy:
    Yıldıran, Y.
    Avcu, E.
    Şahin, A.
    Fidan, S.
    Yetiştiren, H.
    Sınmazçelik, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1195082.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Bx
    81.70.-q
    68.35.B-
    68.35.-p
    42.79.Ls
    68.37.Hk
    07.85.Nc
    Opis:
    This study aims to examine solid particle erosion behavior of 3003 aluminum alloy. 3003 aluminum alloy samples were eroded in erosion test rig under various particle impingement angles (15°, 30°, 45° and 60°) and acceleration pressures (1.5, 3 and 4 bar) by using 80 mesh and 180 mesh sized erodent particles (garnet). The erosion rates of aluminum alloy samples were calculated depending on the erosion parameters. The erosion rates of the samples have varied dramatically depending on particle impingement angle, acceleration pressure and erodent particle size. The maximum erosion rates were observed at 15° impingement angles at all acceleration pressures and particle sizes. Moreover, erosion rates of the samples were increased with increases in acceleration pressure at all particle impingement angles and particle sizes. On the other hand, erosion rates of the samples decrease with increase in erodent particle sizes. Hence, maximum erosion was observed when the aluminum alloy eroded at 15° impingement angle and 4 bar pressure by using 180 mesh erodent particles. Finally, the eroded surfaces of the samples were analyzed by using scanning electron microscope. The surfaces of the samples were also investigated by using energy dispersive X-ray analysis in scanning electron microscopy studies. Microcutting and microploughing erosion mechanisms were observed at 15° and 30° impingement angles, while deep cavities and valleys formed due to plastic deformation were observed at 45° and 60° impingement angles. Moreover, embedded erodent particles were clearly detected on the surfaces of the samples by energy dispersive X-ray analysis.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 523-525
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influences of Particle Impingement Angle and Velocity on Surface Roughness, Erosion Rate, and 3D Surface Morphology of Solid Particle Eroded Ti6Al4V Alloy
    Autorzy:
    Avcu, E.
    Yıldıran, Y.
    Şahin, A.
    Fidan, S.
    Sınmazçelik, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1194513.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Bx
    81.70.-q
    68.35.B-
    68.35.-p
    42.79.Ls
    Opis:
    In this study, it is aimed to investigate the effects of particle impingement angle and velocity on the surface roughness, erosion rate, and surface morphology of solid particle eroded Ti6Al4V alloy. Ti6Al4V samples were eroded in erosion test rig under various particle impingement angles (15°, 30°, 45°, 60°, 75° and 90°) and impingement velocities (33 m/s, 50 m/s, and 75 m/s) by using 120 mesh garnet erodent particles. Subsequently, erosion rates and surface roughness values of samples were analyzed and calculated as a function of particle impingement angle and velocity. Moreover, 3D surface morphologies of the eroded samples were prepared by using high definition scanner and image processing programs. Results show that erosion rates, surface roughness values and surface morphologies of Ti6Al4V alloy have been varied significantly depending on the both particle impingement angle and velocity. Erosion rates of Ti6Al4V alloy were decreased with increases in particle impingement angle; on the other hand, the surface roughness values were increased with increases in particle impingement angle. Both erosion rates and surface roughness values were increased with increases in particle impingement velocity. Finally, the surface morphologies of the eroded samples were evaluated deeply. It is concluded that the surface morphology variation of the Ti6Al4V alloy depending on the particle impingement angle and velocity were well correlated with the erosion rates and the surface roughness values.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 541-543
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of GSM, LTE and Wi-Fi Electromagnetic Radiation in Dwellings
    Autorzy:
    Karan, Y.
    As, N.
    Şahın, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031943.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    wireless network adapter
    electromagnetic radiation
    electromagnetic pollution
    global system for mobile communications
    wireless fidelity
    Opis:
    Electromagnetic radiation exposure increases with the rise of the wireless communication devices. Electromagnetic radiation, especially near 2400 MHz band, has gradually increased with the widespread of wireless fidelity adapter in indoor environment. In this study, electromagnetic radiation in dwellings where different Wi-Fi adapters and routers are used was assessed by measuring the electric field and compared with other electromagnetic radiation source and the limits set by the Information and Communication Technologies Authority. Measurements were taken in the range of 760-2690 MHz bands used by GSM, 3G/LTE and Wi-Fi technologies. The detected values for all frequencies are significantly lower than the limits of the Information and Communication Technologies Authority. Among the electromagnetic radiation sources, electromagnetic radiation of Wi-Fi adapter is higher than GSM/3G/LTE sources radiation in dwellings. Electromagnetic radiation values in nearest point of high power adapter Wi-Fi antenna are close to the Information and Communication Technologies Authority limit value. Results show that electromagnetic radiation based on Wi-Fi adapters or routers can be higher than GSM based electromagnetic radiation.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 509-512
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Manipulation of Exchange Coupling in Py/Co/Cr Multilayer Thin Films
    Autorzy:
    Aköz, M.
    Parlak, U.
    Şahin, Y.
    Tavşan, D.
    Tarcan, E.
    Öztürk, O.
    Tokdemir Öztürk, S.
    Erkovan, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401229.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.Cn
    75.50.Cc
    76.50.+g
    Opis:
    The main issue addressed in present study is exchange coupling modification between ferromagnetic layers through non-magnetic spacer layers using extra ultra-thin ferromagnetic layers (Co). In order to achieve this goal, we prepared Cr(50 Å) / Py(20 Å) / Co(5 Å) / Cr(7, 10, 13 Å) / Co(5 Å) / Py (30 Å) / Cr(50Å) / Si using magnetron sputtering at UHV conditions and characterized by Ferromagnetic Resonance (FMR) technique. As the present study results were compared to our previous study on (Py/Cr), the exchange coupling energy was increased ten times with the cobalt thin layer
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 992-994
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical and Thermal Properties of Pumice Powder Filled PPS Composites
    Autorzy:
    Sahin, A.
    Yildiran, Y.
    Avcu, E.
    Fidan, S.
    Sinmazcelik, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1182862.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Qk
    81.70.Bt
    81.70.Pg
    Opis:
    Recently, it is common application to use particle materials as fillers to improve engineering properties and lower the cost of finished product. Pumice powder is cheaper than most of traditional particle fillers, however use of pumice powders as a reinforcing material in composites has not been studied in literature. Hence, in this study we have investigated the mechanical and the thermal properties of pumice powder filled polyphenylenesulphide (PPS) composites. PPS composites were reinforced with pumice powder at different loading rates (0, 1, 3.5, and 10 wt%) and they were manufactured by twin screw extruder and injection molding machine. Thermal properties were investigated by thermogravimetric analysis and differential scanning calorimeter methods. Moreover, mechanical properties such as barcol hardness, tensile strength, and modulus of samples were investigated. Thermal properties of composite samples have varied significantly depending on the loading rate. Also mechanical properties of pumice powder filled PPS composites have showed better results than pure PPS. According to test results both of mechanical and thermal properties of composites have improved with pumice powder reinforcement and it is determined that pumice powders can be used instead of traditional particle fillers.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 518-520
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure and hardness characteristics of Al₂O₃-B₄C particle-reinforced Cu matrix composites
    Autorzy:
    Öksüz, K.
    Şahin, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/1155450.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Ni
    81.20.Ev
    81.40.Ef
    46.55.+d
    Opis:
    Copper is widely used in industrial applications because of its high electrical and thermal conductivity, easiness of processing and good corrosion resistance. However, copper also has some distinct limitations such as low hardness, low tensile yield strength and poor creep resistance. In this report copper matrix was reinforced with ceramics like Al₂O₃ and B₄C particles using powder metallurgy (PM) method and its microstructure was examined with SEM and EDS. The microstructure has revealed an uniform distribution of particles in the matrix and a good interface bonding between B₄C particles and the matrix. However the dispersion of Al₂O₃ particles, of larger sizes, has led to some porosity and inter-particle contacts in the composites. Therefore, hardness of B₄C particle-reinforced composites is significantly higher than that of Al₂O₃ particle-reinforced composites.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 650-652
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nano-Bioceramic Synthesis from Tropical Sea Snail Shells (Tiger Cowrie - Cypraea Tigris) with Simple Chemical Treatment
    Autorzy:
    Şahin, Y.
    Gündüz, O.
    Bulut, B.
    Özyeğin, L.
    Gökçe, H.
    Ağaoğulları, D.
    Chou, J.
    Kayalı, E.
    Ben-Nissan, B.
    Oktar, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401280.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.-b
    87.68.+z
    28.52.Fa
    Opis:
    In this study several bioceramic materials (i.e. hydroxyapatite, whitlockite) were prepared by using chemical synthesis method from sea snail shells (Tiger Cowrie - Cypraea Tigris), originated from Pacific Ocean. Marine shells usually present aragonite-calcite structures and generally, complicated and pressurized equipment is necessary to convert these structures into bioceramics. Instead of using complicated systems, a basic ultrasonic equipment and simple chemical synthesis method was used in the process. DTA analysis was performed to calculate the required amount of H₃PO₄ solution in order to set the appropriate stoichiometric ratio of Ca/P equal to 1.667 for HA bioceramic or to 1.5 for β-TCP bioceramic in the titration. The prepared batches were sintered at 800°C and 400°C for hydroxyapatite (HA) and β-tri calcium phosphate (β-TCP) forms respectively. X-ray diffraction analysis, scanning electron microscopy (SEM) and infrared observations (FTIR) were implemented for both TCP and HA bioceramics. By applying the chemical synthesis with basic ultrasonic equipment, this study proposes a simple way of production for nano-HA /TCP powders from a natural marine sources.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1055-1058
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimizing Technology Selection in Maritime Logistics
    Autorzy:
    Sahin, B.
    Senol, Y. E.
    Bulut, E.
    Duru, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/409136.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    technology management
    shipping logistics company
    RS-FAHP
    Opis:
    In this study, we consider a technology selection problem in maritime logistics based on lifespan, brand value, maintenance, repair, operations and cost. Low cost, acceptable risk, and environment friendly form of transportation are primarily required for the logistics sector. In a conventional holistic approach, technology is firstly selected in terms of its cost. However, in the step-wise manner, it is obvious that other factors (i.e. reliability, sustainability, etc.) directly involve in to the selection process. By using conventional AHP method, we investigate the general tendency of the ship owners and its reflections to the maritime logistics.
    Źródło:
    Research in Logistics & Production; 2015, 5, 3; 299-309
    2083-4942
    2083-4950
    Pojawia się w:
    Research in Logistics & Production
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spark Plasma Sintering of Boron Carbide Ceramics Using Different Sample Geometries and Dimensions
    Autorzy:
    Cengiz, M.
    Yavas, B.
    Celik, Y.
    Goller, G.
    Yucel, O.
    Sahin, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1216387.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.20.Ev
    81.05.Je
    Opis:
    $B_4C$ ceramics were fabricated by spark plasma sintering technique at 1700°C-1800C for 5 min under applied pressure of 50 MPa under vacuum atmosphere. Two different grades of $B_4C$ powder from H.C. Starck Company namely HP grade and HS grade were used in all related experiments. Effect of sample geometry and dimensions as well as sample thickness on sintering parameters were analyzed. Samples having 5 mm thickness and 50 mm diameter, 8 mm thickness in circular geometries and 50 × 50 square cross-section, 8 mm thickness were fabricated. Using the powder, which provided the densest sample, yttrium oxide $(Y_2O_3)$ was added, mixed and sintered. Optimization of SPS method production parameters for pure $B_4C$ samples and $B_4C$ samples with 5 wt% yttrium oxide additive were accomplished. The effect of geometry on density, Vickers hardness, fracture toughness, and microstructure were examined. The hardness and fracture toughness values of the samples were evaluated by the Vickers indentation technique.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 260-262
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The antimicrobial and antioxidant activities of extracts obtained from some moss species in Turkey
    Aktywność przeciwdrobnoustrojowa i przeciwutleniająca wyciagów z wybranych gatunków mchów rosnących w Turcji
    Autorzy:
    Erturk, O.
    Sahin, H.
    Erturk, E.Y.
    Hotaman, H.E.
    Koz, B.
    Ozdemir, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/72224.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Włókien Naturalnych i Roślin Zielarskich
    Opis:
    Pharmaceutical industry is forced to develop new pharmacologically active molecules. Like other plants, mosses are considered to be potential source of new biologically active compounds. The present study was designed to evaluate the The antimicrobial and antioxidant activities of extracts obtained from some moss species in Turkey antimicrobial and antioxidant activity of 8 moss species: Hypnum cupressiforme, Homalothecium sericeum, Thuidium delicatulum, Homalothecium lutescens, Homalothecium nitens, Leucodon sciuroides, Ctenidium molluscum, and Eurhynchium striatulum obtained from Turkey. Methods: The antimicrobial activity of extracts was investigated against four Gram (+) and six Gram (–) bacterial strains and three tested fungi. Total phenolic content (TPC), cupric reducing antioxidant capacity (CUPRAC), ferric reducing antioxidant power (FRAP), and DPPH radical scavenging activity assays were applied to determine the antioxidant activity. All moss extacts were found to be active against all the organisms except Homalothecium nitens. Especially, H. sericeum and E. striatulum showed the best antioxidant activity. The obtained results show that mosses may be used as possible natural antioxidant, antimicrobial agents to control various human, animal and plant diseases.
    Przemysł farmaceutyczny wciąż poszukuje nowych związków aktywnych. Podobnie jak inne rośliny, również mchy uważa się za potencjalne źródło nowych związków biologicznie czynnych. Przedstawione badania miały na celu określenie aktywności przeciwdrobnoustrojowej i przeciwutleniającej ośmiu gatunków mchów rosnących w Turcji: Hypnum cupressiforme, Homalothecium sericeum, Thuidium delicatulum, Homalothecium lutescens, Homalothecium nitens, Leucodon sciuroides, Ctenidium molluscum i Eurhynchium striatulum. Działanie przeciwdrobnoustrojowe wyciągów badano w stosunku do czterech szczepów bakterii Gram (+) i sześciu Gram (–) oraz w stosunku do trzech gatunków grzybów. Działanie przeciwutleniające badano oznaczając sumę zawartości związków fenolowych (TPC), zdolność redukowania miedzi (CUPRAC), zdolność redukowania jonów żelaza (FRAP) i oznaczając działanie przeciwutleniające z użyciem rodnika DPPH . Wszystkie badane wyciągi z mchów (za wyjątkiem Homalothecium nitens) wykazywały aktywność przeciwdrobnoustrojową w stosunku do testowanych mikroorganizmów. Najsilniejsze działanie przeciwutleniające wykazały wyciągi z H. sericeum i E. striatulum. Otrzymane wyniki wskazują, że można traktować mchy jako potencjalne naturalne źródła substancji antyoksydacyjnych i przeciwdrobnoustrojowych do zwalczania chorób ludzi, zwierząt i roślin.
    Źródło:
    Herba Polonica; 2015, 61, 4
    0018-0599
    Pojawia się w:
    Herba Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effects of Cycle Temperature and Cycle Pressure Ratios on the Performance of an Irreversible Otto Cycle
    Autorzy:
    Ust, Y.
    Sahin, B.
    Safa, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1493409.pdf
    Data publikacji:
    2011-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    05.70.Ln
    88.05.-b
    88.20.td
    Opis:
    This paper reports the thermodynamic optimization based on the maximum mean effective pressure, maximum power and maximum thermal efficiency criteria for an irreversible Otto heat engine model which includes internal irreversibility resulting from the adiabatic processes. The mean effective pressure, power output, and thermal efficiency are obtained by introducing the compression ratio, cycle temperature ratio, specific heat ratio and the compression and expansion efficiencies. Optimal performance and design parameters of the Otto cycle are obtained analytically for the maximum power and maximum thermal efficiency conditions and numerically for the maximum mean effective pressure conditions. The results at maximum mean effective pressure conditions are compared with those results obtained by using the maximum power and maximum thermal efficiency criteria. The effects of the cycle temperature ratio and cycle pressure ratio on the general and optimal performances are investigated.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 3; 412-416
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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