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Wyświetlanie 1-15 z 17
Tytuł:
Three-Axis Attitude Estimation Of Satellite Through Only Two-Axis Magnetometer Observations Using LKF Algorithm
Autorzy:
Mehrjardi, M. F.
Sanusi, H.
Ali, M. A. M.
Powiązania:
https://bibliotekanauki.pl/articles/221622.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
satellite three-axis attitude estimation
two-axis magnetometer
observations
LKF
PD controller
Opis:
Estimation of satellite three-axis attitude using only one sensor data presents an interesting estimation problem. A flexible and mathematically effective filter for solving the satellite three-axis attitude estimation problem using two-axis magnetometer would be a challenging option for space missions which are suffering from other attitude sensors failure. Mostly, magnetometers are employed with other attitude sensors to resolve attitude estimation. However, by designing a computationally efficient discrete Kalman filter, full attitude estimation can profit by only two-axis magnetometer observations. The method suggested solves the problem of satellite attitude estimation using linear Kalman filter (LKF). Firstly, all models are generated and then the designed scenario is developed and evaluated with simulation results. The filter can achieve 10e-3 degree attitude accuracy or better on all three axes.
Źródło:
Metrology and Measurement Systems; 2015, 22, 4; 577-590
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance evaluation of ZVS/ZCS high efficiency AC/DC converter for high power applications
Autorzy:
Ali, A.
Chuanwen, J.
Khan, M. M.
Habib, S.
Ali, Y.
Powiązania:
https://bibliotekanauki.pl/articles/200472.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
switching losses
zero current switching
zero voltage switching
power quality
reverse recovery loss
Opis:
The increased power density, reduced switching losses with minimum electromagnetic interference (EMI), and high efficiency are essential requirements of power converters. To achieve these characteristics, soft power converters employing soft switching techniques are indispensable. In this paper, a ZCS/ZVS PWM AC/DC converter topology has been emphasized, which finds applications in high power systems such as automobile battery charging and renewable energy systems. This converter scheme maintains zero current and zero voltage switching conditions at turn on and turn off moments of semiconductor switches, respectively and soft operation of rectifier diodes that lead to negligible switching and diode reverse recovery losses. Moreover, it improves power quality and presents high input power factor, low total harmonic distortion of the input current (THDI ) and improved efficiency. The validity of theoretical analysis of the proposed converter has been carried out experimentally on a 10 kW laboratory prototype. Experimental results prove that the soft switching operation of the semiconductor switches and diodes is maintained at 98.6% rated load efficiency. In addition, the performance evaluation has been performed by comparative analysis of the proposed converter with some prior art high power AC/DC converters. Efficiencies of the proposed and prior art high power topologies have been determined for different load conditions. The highest efficiency, power factor and lower THDI of the proposed converter topology complies with international standards.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 4; 793-807
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Short Range Synthetic Aperture Imaging Radar with Rotating Antenna
Autorzy:
Ali, F.
Urban, A.
Vossiek, M.
Powiązania:
https://bibliotekanauki.pl/articles/226520.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
radar
synthetic aperture
scanning
imaging
Opis:
The design of a short range synthetic aperture imaging radar is introduced in this paper. A radar hologram is acquired using a small omnidirectional antenna that is mounted on a rotating platform. After each turn of the platform a high resolution 360° 2D image is reconstructed; a rotating window function optimizes the reconstructed image function to get the best image focus for detecting both weak and strong scatterers. The rotating window function depends on the target direction and is executed for each image point and each target direction. The size of the synthetic aperture – and thus the lateral resolution of the imaging system – is determined by the diameter of the circular antenna trajectory. In contrast to common radar scanner concepts that utilize highly directional and thus bulky antennas, the proposed scanner concept has the advantage of using a small, lightweight omni-directional antenna. The developed radar system is much more compact and the scanning mechanics are significantly simplified. Furthermore, an omni-directional antenna offers very straightforward options for powering the radar on the rotation platform. Measurement results obtained with a 24 GHz FMCW short range radar sensor illustrate the performance of the proposed SAR imaging method.
Źródło:
International Journal of Electronics and Telecommunications; 2011, 57, 1; 97-102
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Feline ocular toxoplasmosis: seroprevalence, diagnosis and treatment outcome of 60 clinical cases
Autorzy:
Ali, K.M.
Abu-Seida, A.M.
Abuowarda, M.
Powiązania:
https://bibliotekanauki.pl/articles/2087214.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cats
chorioretinitis
keratitis
seroprevalence
Toxoplasma gondii
uveitis
Źródło:
Polish Journal of Veterinary Sciences; 2021, 24, 1; 51-61
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Micropropagation of Grewia tenax (Forssk.) Fiori – an important ethnomedicinal plant
Autorzy:
Daffalla, H.M.
Elsheikh, A.M.
Ali, H.A.
Khalafalla, M.M.
Powiązania:
https://bibliotekanauki.pl/articles/80945.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ethnomedicine
Grewia tenax
micropropagation
shrub species
natural environment
seed dormancy
cotyledon
benzyladenine
kinetin
adenine
thidiazuron
multiple shoot culture
shoot multiplication
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2019, 100, 3
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of a Square Parasitic Antenna by Using Lumped Elements
Autorzy:
Ferchichi, A.
Azizi, M. K.
Ali, G.
Powiązania:
https://bibliotekanauki.pl/articles/227118.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
RFID TAG
parasitic antenna
Lumped element
Opis:
In this paper, a novel approach to design a parasitic antenna for an RFID application. This approach is based on using a parasite square patch near to a square patch. The square antenna is simulated by using HFSS and ADS and the proposed parasitic antenna is developed by using Lumped elements. This antenna can be integrated in an RFID TAG by using the electrical model of both antenna and IC. The size of antenna is 31mm*31mm*8.5mm.
Źródło:
International Journal of Electronics and Telecommunications; 2012, 58, 3; 279-283
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Protoplast isolation and plant regeneration in two cultivated coriander varieties, Co-1 and RS
Autorzy:
Ali, M.
Mujib, A.
Zafar, N.
Tonk, D.
Powiązania:
https://bibliotekanauki.pl/articles/80271.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
plant regeneration
Coriandrum sativum
coriander
cultural variety
plant growth regulator
2,4-dichlorophenoxyacetic acid
6-benzyladenine
alpha-naphthalene acetic acid
gibberellic acid
callus induction
somatic embryogenesis
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2018, 99, 4
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantification of taxol by high-performance thin layer chromatography in Taxus wallichiana callus cultivated in vitro
Autorzy:
Mujib, A.
Tonk, D.
Gulzar, B.
Maqsood, M.
Ali, M.
Powiązania:
https://bibliotekanauki.pl/articles/2096321.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
antioxidant enzymes
callus induction
stress
taxol
Taxus wallichiana
2
4-dichlorophenoxyacetic
acid
Opis:
In the present study, the induction of callus, callus biomass growth and the yield of taxol were investigated in Taxus wallichiana. This is the first report of a quantification study of taxol in in vitro grown tissues of Taxus obtained from Jammu and Kashmir provinces, India. For callus induction, three different explant types (leaf, cone and stem) were cultured in media supplemented with 2,4-dichlorophenoxyacetic acid (2,4-D), naphthaleneacetic acid (NAA) and 6-benzylaminopurine (BAP). The stem was most responsive to callusing, and the maximum callus induction frequency of 71.5% was noted on medium amended with 2.0 mg/l 2,4-D. The medium amended with 2,4-D and ascorbic acid (AA) showed better callus growth and the maximum biomass (0.082 g, fresh weight). The yield of taxol was quantified in the callus grown on a medium supplemented with different plant growth regulators (PGRs) by using high-performance thin layer chromatography (HPTLC). The taxol yield was maximum (1.053 μg/g dry weight) in 2,4-D-stimulated callus, followed by callus treated with NAA in which 0.896 μg/g dry weight taxol was detected. The maximum taxol yield (56.6%) was obtained in the callus grown on the medium amended with 2,4-D, and a 33.3% increased yield was noted on the NAA-supplemented medium. As a stress marker, the activities of the antioxidant enzymes superoxide dismutase (SOD) and ascorbate peroxidase (APX) and the level of proline were measured in an auxin (2,4-D and NAA)-supplemented medium. The callus grown on the 2,4-D-supplemented medium had high levels of SOD (3.91 min-1 * mg-1 protein), APX (1.61 min -1 * mg-1 protein) and proline (6.57 mg/g), thus suggesting a higher stress level; the callus grown on the NAA-supplemented medium had slightly lower levels of SOD and APX enzyme activities and proline content (3.01 min-1 * mg -1 protein, 1.04 min-1 * mg -1 protein and 5.90 mg/g, respectively). BAP had little influence on stress parameters. The present study thus indicates a good taxol yield in the callus cultured in 2,4-D, which functioned as a signalling element and a stressor. The taxol yield in response to PGRs was analysed in in vitro cultivated tissues.
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2020, 101, 4; 337-347
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Production of bioactive metabolites from different marine endophytic Streptomyces species and testing them against methicillin-resistant Staphylococcus aureus (MRSA) and cancer cell lines
Autorzy:
El-Gendy, M.M.A.A.
Mohamed, Z.K.
Hekal, N.Z.
Ali, F.M.
Yousef, A.E.M.
Powiązania:
https://bibliotekanauki.pl/articles/81078.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Staphylococcus aureus
infection
methicillin-resistant Staphylococcus aureus
endophyte
Streptomyces
bioactive metabolite
Actinomycetes
marine invertebrate
anticancer activity
cancer cell line
lung cancer
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2018, 99, 1
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Slow Rusting Resistance in Iranian Barley Cultivars to Puccinia Striiformis sp.Hordei
Autorzy:
Ali Safavi, S.
Ahari, A.B.
Afshari, F.
Arzanlou, M.
Powiązania:
https://bibliotekanauki.pl/articles/65042.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Race-specific resistance of barley (Hordeum vulgare L.) to the yellow rust caused by Puccinia striiformis f. sp. hordei, has been reported to be short-lived. Slow rusting resistance has been reported to last for a long time. Twenty Iranian barley cultivars along with resistant and susceptible controls were tested during the 2009-2010 and the 2010-2011 cropping seasons, in field plots at the Ardabil Agricultural Research Station (Iran). The cultivars were tested to identify slow rusting genotypes through epidemiological variables which included: final rust severity (FRS), apparent infection rate (r), relative area under the disease progress curve (rAUDPC), and coefficient of infection (CI). Moreover, differential sets were evaluated in order to determine effective and ineffective resistance genes to barley yellow rust. Results of the mean comparison of resistance parameters showed that cultivars Makouee, Dasht, Fasih, and Arass had low values of FRS, CI, r and rAUDPC compared with susceptible cultivars. The cultivars Walfajre, Abidar and Sahand which had moderate values of the different parameters, were marked as possessing a moderate level of slow rusting. The rest of the cultivars which had high values of different quantitative parameters, were grouped as having a low level of slow rusting or as susceptible. The correlation coefficient between different parameters of slow rusting was significantly high (r = 0.83-0.98). The virulence profile of the prevalent races revealed that rpsEm1, rpsEm2, rpsHF, Rps4, rpsVa1, rpsVa2, rpsAst were effective, and rps2, Rps1.b were ineffective resistance genes during the two year testing period.
Źródło:
Journal of Plant Protection Research; 2013, 53, 1
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Signatures of Late Neoproterozoic Gondwana assembly and Maronian glaciation in Lesser Himalaya: a palaeogeographical and stratigraphical approach
Autorzy:
Umar, M.
Betts, P.
Khan, M. M. S.
Sabir, M. A.
Farooq, M.
Zeb, A.
Jadoon, U. K.
Ali, S.
Powiązania:
https://bibliotekanauki.pl/articles/139442.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Neoproterozoic
palaeogeography
Glaciation
Rodinia break-up
Lesser Himalaya
neoproterozoik
paleogeografia
zlodowacenie
Rodinia
rozpad
Himalaje Małe
Opis:
Stratigraphical and sedimentological analyses of Late Neoproterozoic successions in Lesser Himalaya are combined herein with palaeogeographical considerations and comparisons with equivalent successions in India and South China. The succession starts with the Hazara Formation, which contains complete and incomplete Bouma sequences suggesting its deposition in deep marine turbidite settings. The overlying Tanawal Formation, rich in massive sandstone, shale and siltstone, was deposited in shallow marine conditions, as indicated by the presence of parallel lamination, large scale tabular, trough cross- and hummocky cross-stratifications. The Tanawal Formation facies shift laterally from proximal (south-southeast) to distal (north-northwest). The glaciogenic Tanaki Boulder Bed, overlying the Tanawal Formation, was deposited during the Maronian glaciation. It is equivalent to the Blaini Formation of India, and to the Sinian diamictites of South China. The Abbottabad Formation of Cambrian age overlies the Tanaki Boulder Bed, and is composed of dolomite, chert nodules and phosphate-rich packages; similar successions are documented in India and South China at the same stratigraphical interval. The similarities of the Neoproterozoic successions of Lesser Himalaya (both in Pakistan and India) and South China suggests their possible proximity during the break-up of Rodinia and the assembly of the Gondwana Supercontinent.
Źródło:
Acta Geologica Polonica; 2015, 65, 1; 1-19
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Approach to Design Broadband Air Backed Piezoelectric Sensor
Autorzy:
Ali, M. G. S.
Elsayed, N. Z.
Eid, E. A.
Powiązania:
https://bibliotekanauki.pl/articles/176360.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
piezoelectric
equivalent circuits
impulse response
frequency response
matching layers
z-transform
Opis:
In this work, an approach to the design of broadband thickness-mode piezoelectric transducer is presented. In this approach, simulation of discrete time model of the impulse response of matched and backed piezoelectric transducer is used to design high sensitivity, broad bandwidth, and short-duration impulse response transducers. The effect of matching the performance of transmitting and receiving air backed PZT-5A transducer working into water load is studied. The optimum acoustical characteristics of the quarter wavelength matching layers are determined by a compromise between sensitivity and pulse duration. The thickness of bonding layers is smaller than that of the quarter wavelength matching layers so that they do not change the resonance peak significantly. Our calculations show that the −3 dB air backed transducer bandwidth can be improved considerably by using quarter wavelength matching layers. The computer model developed in this work to predict the behavior of multilayer structures driven by a transient waveform agrees well with measured results. Furthermore, the advantage of this this model over other approaches is that the time signal for optimum set of matching layers can be predicted rapidly.
Źródło:
Archives of Acoustics; 2015, 40, 1; 3-10
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Simulation for Detecting Nonlinear Echoes from Microbubbles Packets
Autorzy:
Ali, M. G. S.
Elsayed, N. Z.
Eid, E. A.
Powiązania:
https://bibliotekanauki.pl/articles/177697.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
microbubbles packets
harmonic component
acoustic
radial dynamic
pressure spectrum
Opis:
This work presents a simulation of the response of packets of microbubbles in an ultrasonic pulse-echo scan line. Rayleigh-Plesset equation has been used to predict the echo from numerically obtained radial dynamics of microbubbles. Varying the number of scattering microbubbles on the pulse wave form has been discussed. To improve microbubble-specific imaging at high frequencies, the subharmonic and second harmonic signals from individual microbubbles as well as microbubbles packets were simulated as a function of size and pressure. Two different modes of harmonic generation have been distinguished. The strength and bandwidth of the subharmonic component in the scattering spectrum of microbubbles is greater than that of the second harmonic. The pressure spectra provide quantitative and detailed information on the dynamic behaviour of ultrasound contrast agent microbubbles packet.
Źródło:
Archives of Acoustics; 2015, 40, 2; 151-157
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes in blood acid-base balance parameters and coagulation profile during diarrhea in calves
Autorzy:
Sobiech, P.
Rekawek, W.
Ali, M.
Targonski, R.
Zarczynska, K.
Snarska, A.
Stopyra, A.
Powiązania:
https://bibliotekanauki.pl/articles/31605.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
The purpose of this study was to investigate possible alterations in acid-base balance parameters and the coagulation profile in neonatal diarrheic calves. Twenty neonatal diarrheic and 20 clinically healthy neonatal calves aged between 1 week to 10 days were used. All blood samples were taken on the third day from the onset of diarrhea symptom. Venous blood samples were collected from each animal to determine platelet numbers, pH, pCO₂, pO₂, HCO₃⁻, BE, O₂SAT, ctCO₂ and electrolytes (K⁺, Na⁺ and Cl⁻). Plasma samples were collected from each animal for the measurement of prothrombin time (PT), activated partial thromboplastin time (APTT), thrombin time (TT), the concentrations of fibrinogen, D-dimer and the activity of antithrombin III (AT III). Blood pH (7.19), BE (-10.6 mmol/l), HCO₃⁻ (25.15 mmol/l), pO₂ (3.33 kPa), O₂SAT (24.12 %) were significantly lower and serum concentration of K⁺ (6.55 mmol/l) was significantly higher in diarrheic calves. These changes indicate the state of uncompensated metabolic acidosis with accompanying hyperkalemia. TT (32.05s) and APTT (39.9s) values were more prolonged in calves with diarrhea than in the control group. D-dimer (587.25 μg/l) concentrations were significantly increased while a visible drop in AT III (103.75%) activity and platelets counts (598 x10⁹/l) were observed in diarrheic group of calves. The results suggest that a consumptive type of disseminated intravascular coagulation (DIC) developed in diarrheic calves.
Źródło:
Polish Journal of Veterinary Sciences; 2013, 16, 3
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
In vitro propagation of Althaea officinalis: the role of plant growth regulators in morphogenesis
Autorzy:
Mujib, A.
Pipal, T.
Ali, M.
Tonk, D.
Zafar, N.
Gulzar, B.
Powiązania:
https://bibliotekanauki.pl/articles/79918.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Althaea officinalis
marshmallow
in vitro propagation
clonal multiplication
2,4-dichlorophenoxyacetic acid
plant growth regulator
morphogenesis
rooting
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2017, 98, 3
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
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