Temat: tilt - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Orientation of lutein in a lipid bilayer - revisited
Autorzy:: Pasenkiewicz-Gierula, Marta
Baczyński, Krzysztof
Murzyn, Krzysztof
Markiewicz, Michał
Powiązania:: https://bibliotekanauki.pl/articles/1039792.pdf
Data publikacji:: 2012
Wydawca:: Polskie Towarzystwo Biochemiczne
Tematy:: molecular modeling
tilt angle
macular pigment
Opis:: Lutein is present in the human retina and lens, where it plays a protective role. As lutein is associated with the lipid matrix of biomembranes, the role depends on its membrane location. Experimental studies predicted two orientations of lutein in a phosphatidylcholine (PC) bilayer: vertical and horizontal. Using a molecular dynamics simulation, we observed, in two different PC bilayers, both orientations of lutein, and in each bilayer, a single change from vertical to horizontal orientation or vice versa. Both orientations were stabilized by hydrogen bonding of lutein OH groups with mainly carbonyl but also phosphate oxygen atoms of PC.
Źródło:: Acta Biochimica Polonica; 2012, 59, 1; 115-118
0001-527X
Pojawia się w:: Acta Biochimica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The performance analysis of dusty photovoltaic panel
Autorzy:: Katoch, Minakshi
Dahiya, Vineet
Yadav, Surendra Kumar
Powiązania:: https://bibliotekanauki.pl/articles/27312227.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: dust accumulation
tilt angle
photovoltaics
solar panel
transmittance
Opis:: Solar photovoltaic power is widely utilized in the energy industry. The performance of solar panels is influenced by different variables, including solar radiation, temperature, wind speed, relative humidity and the presence of haze or dirt. Outdoor solar panels are particularly susceptible to a decrease in energy efficiency due to the accumulation of dust particles in the air, which occurs as a result of natural weather conditions. The extent of dust deposition is primarily determined by factors such as the tilt angle of the panel, wind direction, cleaning frequency as well as local meteorological and geographical conditions. The dust on the solar cell glazing reduces the optical transmittance of the light beam, causing shadowing and diminishing the energy conversion productivity of the panels. Sand storms, pollution levels and snow accumulations all significantly impact the photovoltaic panel performance. These circumstances reduce the efficiency of solar panels. The experiment was carried out on two identical dust-accumulated and dust-free panels. The evaluation was carried out in two different situations on the offgrid stand-alone system: in a simulated atmosphere and in an open space during the day. The current-voltage curves have been developed for both panels at various tilt degrees. The features provide sufficient information to analyse the performance of the panels under consideration. The measurements demonstrate that as dust collects on the panel’s surface, the average output power and short circuit current decrease dramatically. The installation tilt angle affected the ratio of efficiency and average power outputs of dusty and clean panels.
Źródło:: Archives of Thermodynamics; 2023, 44, 2; 49--68
1231-0956
2083-6023
Pojawia się w:: Archives of Thermodynamics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Thermal analysis of a gravity-assisted heat pipe working with zirconia-acetone nanofluids: An experimental assessment
Autorzy:: Abdolhossein Zadeh, Amin
Nakhjavani, Shima
Powiązania:: https://bibliotekanauki.pl/articles/240484.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: heat pipe
zirconia-acetone nanofluid
tilt angle
filling ratio
Opis:: An experimental investigation was performed on the thermal performance and heat transfer characteristics of acetone/zirconia nanofluid in a straight (rod) gravity-assisted heat pipe. The heat pipe was fabricated from copper with a diameter of 15 mm, evaporator-condenser length of 100 mm and adiabatic length of 50 mm. The zirconia-acetone nanofluid was prepared at 0.05–0.15% wt. Influence of heat flux applied to the evaporator, filling ratio, tilt angle and mass concentration of nanofluid on the heat transfer coefficient of heat pipe was investigated. Results showed that the use of nanofluid increases the heat transfer coefficient while decreasing the thermal resistance of the heat pipe. However, for the filling ratio and tilt angle values, the heat transfer coefficient initially increases with an increase in both. However, from a specific value, which was 0.65 for filling ratio and 60–65 deg for tilt angle, the heat transfer coefficient was suppressed. This was attributed to the limitation in the internal space of the heat pipe and also the accumulation of working fluid inside the bottom of the heat pipe due to the large tilt angle. Overall, zirconia-acetone showed a great potential to increase the thermal performance of the heat pipe.
Źródło:: Archives of Thermodynamics; 2020, 41, 2; 65-83
1231-0956
2083-6023
Pojawia się w:: Archives of Thermodynamics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Tilt Angle of Wood Dust
Autorzy:: Ockajova, Alena
Banski, Adrian
Tomasz, Rogoziński
Powiązania:: https://bibliotekanauki.pl/articles/24072422.pdf
Data publikacji:: 2023
Wydawca:: Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:: wood dust
tilt angle
cleaning of dust
way of machining
Opis:: Tilt Angle of Wood Dust. The aim of this article is to point out a risk factor – wood dust, which settles on various structures, inclined surfaces in operation and, if not regularly cleaned, it is a source of secondary dust, because it is swirled up again with any movement. By measuring the tilt angle of bulk wood material obtained from sawing on a table circular saw, using different saw blades and wood dust from longitudinal and transverse sanding on a hand belt sander, we determined which characteristics affect it. We found that the size of the particles is an important characteristic, the larger they are, the smaller the tilt angle and also the surface of the pad on which the dust particles settle, wood did not play a significant role in this case. The smallest tilt angle was measured for sawdust from longitudinal sawing of 27°, and the largest tilt angle for wood dust from transverse sanding of oak and was 57° on beech pad.
Kąt nachylenia pyłu drzewnego. Celem tego artykułu jest zwrócenie uwagi na czynnik ryzyka - pył drzewny, który osadza się na różnych konstrukcjach, nachylonych powierzchniach podczas pracy. Jeśli nie jest regularnie usuwany, jest źródłem pyłu wtórnego, ponieważ jest ponownie zawirowywany przy każdym ruchu. Mierząc kąt pochylenia sypkiego materiału drzewnego uzyskanego z piłowania na stołowej pilarce tarczowej, przy użyciu różnych brzeszczotów i pyłu drzewnego ze szlifowania wzdłużnego i poprzecznego na ręcznej szlifierce taśmowej, ustaliliśmy, które cechy mają na to wpływ. Stwierdziliśmy, że rozmiar cząstek jest ważną cechą, im są one większe, tym mniejszy kąt pochylenia, a także powierzchnia podkładki, na której osadzają się cząstki pyłu, drewno nie odgrywało w tym przypadku znaczącej roli. Najmniejszy kąt pochylenia zmierzono dla trocin z piłowania wzdłużnego 27°, a największy kąt pochylenia dla pyłu drzewnego ze szlifowania poprzecznego dębu i wynosił 57° na podkładce bukowej.
Źródło:: Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology; 2023, 121; 37--42
1898-5912
Pojawia się w:: Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: The analysis of the solar power plant performance in temperate climate
Autorzy:: Zdyb, A.
Dragan, P.
Jaremek, A.
Powiązania:: https://bibliotekanauki.pl/articles/105126.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:: photovoltaics
grid connected solar plant
photovoltaic performance
inclination angle
tilt angle
Opis:: Due to gradual depletion of fossil fuels resources and emission of harmful chemicals accompanying the combustion process, the interest in alternative energy sources still increases. Among many kinds of alternative sources, solar radiation is very special because of its wide availability and large technical potential. Photovoltaic systems providing the electric energy are used in many countries. The most important part of photovoltaic system is a module, which parameters (e.g. efficiency, rated power, temperature coefficients of power and efficiency, short circuit current, open circuit voltage) are determined in laboratory tests under Standard Test Conditions (STC: 25°C, 1,000 W/m2 , air mass 1.5). However, in real outdoor conditions the modules exhibit lower efficiency since local climate influences their performance and different external factors generate energy losses in the whole system. The aim of this work is the performance analysis of a solar power plant connected to the grid, which total rated power is 2.985 MW and it works in temperate climate in eastern Poland. Insolation in the location was estimated according to Solargis data and the role of the modules tilt angle, of which the value is non-typical for the considered location was studied. The tilt angle smaller than optimal angle allows increasing the amount of the solar radiation collected in the summer period. The electric energy production based on the inverters data in 2016 and 2017 as well as yearly yield are presented. The results are compared to data coming from other solar power plants, also located at high latitude.
Źródło:: Czasopismo Inżynierii Lądowej, Środowiska i Architektury; 2018, 65, 1; 73-79
2300-5130
2300-8903
Pojawia się w:: Czasopismo Inżynierii Lądowej, Środowiska i Architektury
Dostawca treści:: Biblioteka Nauki

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