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Wyświetlanie 1-15 z 638
Tytuł:
Power-to-gas technologies in terms of the integration with gas networks
Autorzy:
Chaczykowski, M.
Osiadacz, A. J.
Powiązania:
https://bibliotekanauki.pl/articles/175166.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
energy storage
renewable gas
hydrogen injection
gas quality
quality tracking
simulation software
Opis:
In a situation of surplus electricity production from fluctuating renewable energy sources, the optimal allocation, capacity and security of energy storage will play a pivotal role in the management of energy systems. In this context, highly flexible storage facilities providing access to stored energy at very short times are gaining in importance. Power-to-gas technologies combined with the injection of the produced gas to the natural gas network create the possibility of using the existing natural gas infrastructure to store large amounts of electricity converted into chemical energy of the fuel. This paper provides overview of selected demonstration projects carried out in this field. The literature review of the sensitivity of the elements of the gas value chain to the increased hydrogen concentrations is conducted. Next, the results of the simulation study of the effect of hydrogen injection on the hydraulic properties of a gas distribution network providing gas to 1167 customers are presented.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2017, 137; 85-103
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Offset Drift Dependence of Hall Cells with their Designed Geometry
Autorzy:
Paun, M. A.
Sallese, J. M.
Kayal, M.
Powiązania:
https://bibliotekanauki.pl/articles/226531.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hall effect sensor
individual and residual offset drift
temperature coefficient
Opis:
In this paper, the performance of CMOS Hall Effect Sensors with four different geometries has been experimentally studied. Using a characteristic measurement system, the cells residual offset and its temperature behavior were determined. The offset, offset drift and sensitivity are quantities that were computed to determine the sensors performance. The temperature coefficient of specific parameters such as individual, residua offset and resistance has been also investigated. Therefore the optimum cell to fit the best in the performance specifications was identified. The variety of tested shapes ensures a good analysis on how the sensors performance changes with geometry.
Źródło:
International Journal of Electronics and Telecommunications; 2013, 59, 2; 169-175
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Utilizing Hollow-Structured Bamboo as Natural Sound Absorber
Autorzy:
Putra, A.
Khair, F. A.
Nor, M. J. M.
Powiązania:
https://bibliotekanauki.pl/articles/177960.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bamboo
hollow structure
acoustic absorber
absorption coefficient
Opis:
Studies to find alternative low environmental-impact materials for acoustic absorbers are still progressing, particularly those originated from natural materials. However, most of the established works are mainly focused on the fibrous-type absorbers. Discussion on the non-fibrous-type absorbers is still lacking and this therefore becomes the objective of this paper. Use of bamboo by utilizing its hollow structure to absorb sound energy is discussed here. The normal incidence absorption coefficient was measured based on the length and diameter of the bamboo, as well as different arrangement of the bamboo structure subjected to the incidence sound, namely, axial, transverse, and crossed-transverse arrangements. The trend of absorption coefficient appears in peaks and dips at equally spacing frequencies. For all arrangements the peak of absorption can reach above 0.8. Introducing an air gap behind the bamboo shifts the peak absorption to lower frequency. Covering the front surface of the absorber improves the sound absorption coefficient for axial arrangement by widening the frequency range of absorption also towards lower frequency range. The transverse arrangement is found to have average absorption coefficient peaks of 0.7 above 1.5 kHz. By arranging the bamboo structure with crossed-transverse arrangement, the suppressed absorption peaks in normal transverse arrangement can be recovered.
Źródło:
Archives of Acoustics; 2015, 40, 4; 601-608
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design criterion for hydrodynamic vortex separator
Autorzy:
Gronowska-Szneler, M.A.
Sawicki, J. M.
Powiązania:
https://bibliotekanauki.pl/articles/175226.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
centrifugal force
particle trajectory
sedimentation
suspended particle
vortex separator
Opis:
The process of designing technical objects involves determination of geometrical parameters that characterize a given device. When device operation is described by differential equations, an inverse problem brings difficulties, as geometrical values being sought condition the solution to the problem. Vortex separators, used for removal of suspension from storm wastewater are usually designed by the ‘criterion method’. Firstly, a critical particle is distinguished such that bigger particles are removed from wastewater stream, whereas smaller particles stay in the stream. Next, by comparing values of major forces acting on the critical particle at the most unfavourable point within the separator (usually at outflow cross-section), a force balance is made. The resulting algebraic relation becomes the design criterion.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2017, 135; 3-9
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An exponential observer and a controller for a class of nonlinear systems
Autorzy:
Hammami, M. A.
Zribi, M
Kallel, J
Powiązania:
https://bibliotekanauki.pl/articles/229713.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nonlinear system
observer
stability
controller
stabilization
Opis:
In this paper, we study the observer design problem for a class of nonlinear systems. Specifically, we design an exponential observer for a separately excited DC motor. Moreover, a stabilizing controller is designed for the system to ensure the exponential stability of the solutions toward their desired values. Simulations results show that proposed observer is able to reconstruct the states of the system. In addition, the simulation results indicate that the designed controller works well.
Źródło:
Archives of Control Sciences; 2013, 23, 1; 79-92
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Garlic Extract on Seed Germination, Seedling Health, and Vigour of Pathogen-Infested Wheat
Autorzy:
Perello, A.
Gruhlke, M.
Slusarenko, A.J.
Powiązania:
https://bibliotekanauki.pl/articles/66293.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
The effect of garlic extract containing bioactive allicin on the germination and subsequent seedling vigour of pathogeninfested wheat seeds, was tested. The first aim was to characterize the antifungal activities of garlic extract and pure allicin, on the most frequently occurring wheat pathogens of the Helminthosporium genus (sensu lato) in Argentina. The second aim was to characterize the antifungal activities of garlic extract and pure allicin on moulds belonging to the natural endogenous microflora. Garlic extract showed fungicidal activity on the endogenous fungal contamination of the wheat seeds and particularly reduced the degree of disease caused by Bipolaris sorokiniana and Drechslera tritici-repentis. Allicin in garlic juice corrected the poor germination of wheat seeds caused by natural mycoflora of grain. Growth promoting activities of garlic juice on wheat seedling vigour was reported. Interestingly, the inoculum on naturally infected wheat seeds could be reduced with garlic juice as a seed dressing biofungicide, before sowing. In this study, we demonstrated the efficacy and the high control potential of garlic extract against seed-borne wheat fungi. Such results suggest that using garlic extract can minimise the risk of infection as well as minimise the risk of chemical fungicide exposure. On the basis of these results, scale-up to field trials using garlic extract and allicin as the dressing biofungicide before sowing for disinfection of wheat seeds, seems justified as a sustainable alternative to the use of chemical fungicides.
Źródło:
Journal of Plant Protection Research; 2013, 53, 4
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantitative determination of ellagic acid and gallic acid in Genum rivale L. and G. urbanum L.
Autorzy:
Owczarek, A.
Olszewska, M.A.
Gudej, J.
Powiązania:
https://bibliotekanauki.pl/articles/19192.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Źródło:
Acta Biologica Cracoviensia. Series Botanica; 2014, 56, 2
0001-5296
Pojawia się w:
Acta Biologica Cracoviensia. Series Botanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fractional-order model of a non-linear inductor
Autorzy:
Lopes, A. M.
Tenreiro-Machado, J. A.
Powiązania:
https://bibliotekanauki.pl/articles/200387.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fractional-order model
inductor
electrical impedance spectroscopy
model ułamkowy
induktor
spektroskopia
impedancja elektryczna
Opis:
This paper adopts a fractional calculus perspective to describe a non-linear electrical inductor. First, the electrical impedance spectroscopy technique is used for measuring the impedance of the device. Second, the experimental data is approximated by means of fractional-order models. The results demonstrate that the proposed approach represents the inductor using a limited number of parameters, while highlighting its most relevant characteristics.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 1; 61-67
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estradiol reduces connexin43 gap junctions in the uterus during adenomyosis in cows
Autorzy:
Korzekwa, A.J.
Lupicka, M.
Socha, B.M.
Szczepanska, A.A.
Powiązania:
https://bibliotekanauki.pl/articles/31714.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Adenomyosis is defined as the presence of glandular foci external to the endometrium of the uterus, either in the myometrium or/and perimetrium, depending on the progress of this dysfunction. To date, we showed that steroids secretion and prolactin expression and proliferative processes are disturbed during uterine adenomyosis in cows. During endometriosis in eutopic endometrium in women, gap junctions are down regulated. The transmembrane gap junction protein, connexin (Cx43) is necessary for endometrial morphological, biochemical and angiogenic functions. The aim of this study is recognition of adenomyosis etiology by determination of the role of Cx43 in this process. Immunolocalization and comparison of Cx43 mRNA and protein expression in healthy (N=9) and adenomyotic uterine tissue (N=9), and Cx43 mRNA expression (real time PCR) in uterine stromal – myometrium co-culture under 24-hour stimulation with 17-beta estradiol (10−7M) isolated from healthy (N=5) and adenomyotic (N=5) cows were determined. Cx43 was localized in healthy and adenomyotic uteri. mRNA and protein expression was down-regulated in uterine tissue in adenomyotic compared with healthy cows (p<0.05). Estradiol stimulated Cx43 mRNA expression in myometrial cell culture and co-culture of stromal and myometrial cells in adenomyotic compared with healthy cows (p<0.05). In summary, down-regulation of Cx43 expression in the junction zone might play an important role in pathogenesis of adenomyosis. Estradiol modulates gap junctions during adenomyosis.
Źródło:
Polish Journal of Veterinary Sciences; 2016, 19, 3
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Primary Crystallization Studies and Abrasion Analysis of Cr-Ni-Mo Cast Steel
Autorzy:
Studnicki, A.
Gromczyk, M.
Kondracki, M.
Suchoń, J.
Szajnar, J.
Powiązania:
https://bibliotekanauki.pl/articles/382166.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
chromium cast steel
primary crystallization
wear test
abrasion
pin on disc
staliwo chromowe
krystalizacja pierwotna
badanie zużycia
ścieranie
Opis:
The article shows results of studies of primary crystallization and wear resistance of Cr-Ni-Mo cast steel intended for work in corrosive and abrasive conditions. The studies of primary crystallization were conducted with use of TDA method and modified tester allowing measurement casting cooling time influence on the cooling and crystallization curves of studied alloys. After heat treatment of examined cast steel wear tests of the samples were conducted on pin-on-disc type device.
Źródło:
Archives of Foundry Engineering; 2015, 15, 4; 75-80
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Proton transfer reaction mass spectrometry approach to monitor monoterpenes emission from Aleppo pine (Pinus halepensis) woods growing in different locations
Autorzy:
Sandak, J.
Sandak, A.
Boschetti, A.
Dimauro, M.
Negri, M.
Powiązania:
https://bibliotekanauki.pl/articles/29887.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
proton transfer reaction mass spectrometry
monoterpene
monoterpene emission
Aleppo pine
Pinus halepensis
wood
tree location
wood provenience
volatile organic compound
detection
France
Algeria
Źródło:
Folia Forestalia Polonica. Series B - Drzewnictwo; 2010, 41
0071-6685
Pojawia się w:
Folia Forestalia Polonica. Series B - Drzewnictwo
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Immunoliogical Responses of Hyphantria Cunea (Drury) (Lepidoptera: Arctiidae) to Entomopathogenic Fungi, Beauveria Bassiana (Bals.-Criy) and Isaria Farinosae (Holmsk.) Fr.
Autorzy:
Ajamhasssani, M.
Sendi, J.J.
Zibaee, A.
Askary, H.
Farsi, M.J.
Powiązania:
https://bibliotekanauki.pl/articles/66549.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Five morphological types of hemocytes were recognized in hemolymph of the 4th instar larvae of Hyphantria cunea (Drury). These hemocytes were: prohemocytes, plasmotocytes, granulocytes, oenocytoids, and spherulocytes. Tests were done on the effects of four isolates of the entomopathogenic fungus Beauveria bassiana (Bals.-Criy) (Fashand, spt-22, Ir-K-40 and 566), one isolate of Isaria farinosae (Holmsk.) Fr. (1872c), and latex-beads on the cellular immune defense mechanism and Phenoloxidase (PO) activity of H. cunea. Observation showed that plasmatocytes and granulocytes engulfed fungal pathogens by phagocytosis. The most phagocytosis occurred 30 and 60 min after injection but nodulation occurred in 3 and 6 hours, in all treatments. The total hemocyte count (THC) and granulocyte, and plasmotocyte numbers increased after the injection of spores. Phenoloxidase activity was determined in the presence of L-DOPA (L-3,4-dihydroxyphenylalanine), as a substrate in intervals, after injection of fungal spores, and latex beads. These studies demonstrated that B. bassiana is a promising candidate for biological control of H. cunea.
Źródło:
Journal of Plant Protection Research; 2013, 53, 2
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatial analysis of air masses backward trajectories in order to identify distant sources of fine particulate matter emission
Analiza przestrzenna wstecznych trajektorii mas powietrza w celu rozpoznania odległych źródeł emisji pyłu drobnego
Autorzy:
Godłowska, J.
Hajto, M. J.
Tomaszewska, A. M.
Powiązania:
https://bibliotekanauki.pl/articles/204690.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
backward trajectories
air masses
emission sources
particulate matter
PM2.5
trajektoria wsteczna
masy powietrza
źródła emisji
pył zawieszony
Opis:
The paper presents a method of identifying distant emission sources of fine particulate matter PM2.5 affecting significantly PM2.5 concentrations at a given location. The method involves spatial analysis of aggregate information about PM2.5 concentrations measured at the location and air masses backward trajectories calculated by HYSPLIT model. The method was examined for three locations of PM2.5 measurement stations (Diabla Góra, Gdańsk, and Katowice) which represented different environmental conditions. The backward trajectories were calculated starting from different heights (30, 50, 100 and 150 m a. g. l.). All points of a single backward trajectory were assigned to the PM2.5 concentration corresponding to the date and the site of the beginning of trajectory calculation. Daily average concentrations of PM2.5 were used, and in the case of Gdańsk also hourly ones. It enabled to assess the effectiveness of the presented method using daily averages if hourly ones were not available. Locations of distant sources of fine particulate matter emission were determined by assigning to each grid node a mean value of PM2.5 concentrations associated with the trajectories points located within the so-called search ellipse. Nearby sources of fine particulate matter emission were eliminated by filtering the trajectories points located close to each other (so-called duplicates). The analyses covered the period of January-March 2010. The results indicated the different origin of air masses in the northern and southern Poland. In Diabla Góra and Gdańsk the distant sources of fine particulate matter emission are identified in Belarus and Russia. In Katowice the impact of the Belarusian PM2.5 emission sources was also noted but as the most important fine particulate matter emission sources were considered those located in the area of Romania, Hungary, Slovakia and Ukraine.
W pracy zaprezentowano metodę rozpoznawania odległych źródeł emisji pyłu drobnego PM2.5, polegającą na przestrzennej analizie łącznej informacji o imisji PM2.5 oraz o wstecznych trajektoriach mas powietrza, obliczonych za pomocą modelu HYSPLIT. Trajektorie wsteczne obliczono startując z wysokości 30, 50, 100 i 150 m n.p.g., dla trzech lokalizacji stacji pomiarowych stężeń PM2.5 (Diabla Góra, Gdańsk, Katowice), reprezentujących różne warunki środowiskowe. Wszystkim punktom pojedynczej trajektorii wstecznej przyporządkowano stężenie PM2.5 odpowiadające dacie startu obliczeń tej trajektorii. Użyto dobowych średnich stężeń PM2.5, a w przypadku Gdańska dodatkowo także godzinnych średnich, co umożliwiło ocenę skuteczności przedstawionej metody. Położenie odległych źródeł emisji pyłu drobnego zostało określone poprzez interpolację danych punktowych trajektorii do regularnej siatki przy zastosowaniu metody metryki danych. Każdemu węzłowi siatki przypisano wartość średnią obliczoną ze stężeń PM2.5 przyporządkowanych punktom trajektorii znajdujących się w obrębie tzw. elipsy wyszukiwania. Przed obliczeniem wartości średniej ukryto część danych, eliminując w ten sposób bliskie źródła emisji pyłu drobnego. Analizy objęły okres styczeń-marzec 2010 roku. Wyniki wskazały na odmienne pochodzenie mas powietrza w północnej i południowej Polsce. W Diablej Górze i Gdańsku odległe źródła emisji pyłu drobnego rozpoznano głównie w Białorusi i Rosji. W Katowicach również zaznaczył się wpływ źródeł białoruskich, ale jako najbardziej istotne odległe źródła emisji PM2.5 uznano te zlokalizowane na obszarze Rumunii, Węgier, Słowacji i Ukrainy.
Źródło:
Archives of Environmental Protection; 2015, 41, 2; 28-35
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 638

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