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Wyszukujesz frazę "Islam, M." wg kryterium: Autor

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Tytuł:
Bounded, asymptotically stable, and L1 solutions of caputo fractional differential equations
Autorzy:
Islam, M.N.
Powiązania:
https://bibliotekanauki.pl/articles/255179.pdf
Data publikacji:
2015
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Caputo fractional differential equations
Volterra integral equations
weakly singular kernel
Schauder fixed point theorem
Liapunov's method
Opis:
The existence of bounded solutions, asymptotically stable solutions, and L1 solutions of a Caputo fractional differential equation has been studied in this paper. The results are obtained from an equivalent Volterra integral equation which is derived by inverting the fractional differential equation. The kernel function of this integral equation is weakly singular and hence the standard techniques that are normally applied on Volterra integral equations do not apply here. This hurdle is overcomed using a resolvent equation and then applying some known properties of the resolvent. In the analysis Schauder's fixed point theorem and Liapunov's method have been employed. The existence of bounded solutions are obtained employing Schauder's theorem, and then it is shown that these solutions are asymptotically stable by a definition found in [C. Avramescu, C. Vladimirescu, On the existence of asymptotically stable solution of certain integral equations, Nonlinear Anal. 66 (2007), 472-483]. Finally, the L1 properties of solutions are obtained using Liapunov's method
Źródło:
Opuscula Mathematica; 2015, 35, 2; 181-190
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Uptake of phenol from aqueous solution by burned water hyacinth
Autorzy:
Uddin, M.T.
Islam, M.S.
Islam, M.A.
Abedin, M.Z.
Powiązania:
https://bibliotekanauki.pl/articles/779654.pdf
Data publikacji:
2008
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
fenol
adsorpcja
równowaga
kinetyka adsorpcji
phenol
adsorption
burned water hyacinth
equilibrium
adsorption kinetics
Opis:
The potential of burned water hyacinth (BWH) for phenol adsorption from aqueous solution was studied. Batch kinetic and isotherm studies were carried out under varying experimental conditions of contact time, phenol concentration, adsorbent dosage and pH. The pH at the point of zero charge (pH(PZC)) of the adsorbent was determined by the titration method and the value of 8.8 š 0.2 was obtained. The FTIR of the adsorbent was carried out in order to find the potential adsorption sites for the interaction with phenol molecules. The Freundlich and Langmuir adsorption models were used for the mathematical description of adsorption equilibrium and it was found that the experimental data fitted very well to the Langmuir model. Maximum adsorption capacity of the adsorbent was found to be 30.49 mg/g. Batch adsorption models, based on the assumption of the pseudo-first-order and pseudo-second-order models, were applied to examine the kinetics of the adsorption. The results showed that kinetic data closely followed the pseudo-second-order model.
Źródło:
Polish Journal of Chemical Technology; 2008, 10, 2; 43-49
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Erbium-doped fiber ring laser dynamical analysis for chaos message masking scheme
Autorzy:
Ali, S. Z.
Islam, M. K.
Powiązania:
https://bibliotekanauki.pl/articles/173276.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
erbium-doped fiber ring laser chaos
optical chaos
chaos message masking
Lyapunov exponent
secure optical communication
Opis:
A detailed dynamical analysis of erbium-doped fiber ring laser cavity loss configuration for the chaos message masking scheme is carried out to optimize the generation of high quality chaos. A threefold increase in Lyapunov exponent implying higher security, and a significant increase in chaos bandwidth is achieved, both ideal for secure optical communication and nonlinear chaotic applications. The pulsed chaos is chaotic in a pulse time interval in addition to the amplitude resulting in better concealment of data pulses in a time domain. The chaos spectrum is a flat broadband and rich in spikes making spectral detection of a message more difficult. The range of five key parameters for which erbium-doped fiber ring laser retains its chaotic behaviour is also increased significantly reducing the effectiveness of a brute force attack to guess the erbium-doped fiber ring laser parameters. The chaos message masking scheme provides a higher security in comparison with additive chaos modulation scheme for implementation of chaotic optical communication using erbium- doped fiber ring laser. The security of a complete end-to-end chaotic optical communication system is tested by launching a spectral attack to estimate the message signal. The message signal clearly hides in a stronger chaotic signal and its spectral contents are not discernible.
Źródło:
Optica Applicata; 2017, 47, 3; 395-410
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relation of motion resistance torque and friction torque in the four stroke engine
Autorzy:
Islam, M. A.
Babiak, M.
Kałużny, J.
Powiązania:
https://bibliotekanauki.pl/articles/242113.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
combustion engine
friction losses
global motion resistance torque
Opis:
Friction resistance identification is indispensable to determine the results of engine modifications which goal was to improve the engine mechanical efficiency. Unfortunately measurement of the friction torque is very difficult to realize because in the total motion resistance torque of the combustion engine the friction torque is only a small part. Resistance torque connected with compression of working medium and also at higher engine speeds with inertia resistance is much higher than friction torque. As a result of research made on the engine test bed the course of resistance connected with realization of the thermodynamic cycle were defined. Sufficient accuracy of these courses allows making an attempt to evolve friction resistance signal from global resistance signal. In the paper comparison of the total motion resistance with results of friction resistance computer simulations for hydrodynamic lubrication of piston-cylinder liner kinematic assembly will be made. It is worth to emphasize that movement resistance researches were made at the serial engine with only slight modifications, which considerably restricts the possibility of diversified engine working conditions influence in relation to the actual engine. Further researches on complete movement resistance simulation of the combustion engine are intended to be realized in order to determine the realizability and probable range of desirable friction losses reduction. Promising results will allow designing the competitive engine relative to present tendencies of "ECOMATIC" engine operation system which was proposed for the first time by Volskswagen.
Źródło:
Journal of KONES; 2011, 18, 2; 185-189
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of different intensities of cold stress on certain physiological phenomena related to skeletal health in a hypogonadal rat model
Autorzy:
Islam, M.N.
Chanda, S.
Mitra, C.
Powiązania:
https://bibliotekanauki.pl/articles/69914.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Fizjologiczne
Tematy:
skeletal change
bone turnover
mineral content
bone density
body mass
rat
cold stress
bone ash
calcium
estrogen
ovariectomy
bone metabolism
osteoporosis
skeletal health
hormone
Źródło:
Journal of Physiology and Pharmacology; 2000, 51, 4,2
0867-5910
Pojawia się w:
Journal of Physiology and Pharmacology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Miniaturized Spectacles Shaped Tapered Slotted Patch Antenna for UWB Applications
Autorzy:
Islam, M. T.
Samsuzzaman, M.
Mahmud, M. Z.
Powiązania:
https://bibliotekanauki.pl/articles/307753.pdf
Data publikacji:
2018
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
patch antenna
tapered ground
UWB
wireless communication
Opis:
A compact planner patch ultra-wideband (UWB) antenna is presented in this paper. The antenna configuration consists of a spectacles-shaped patch and a slotted ground plane. Different parameters are investigated for improving the antenna’s properties and for achieving the preferred UWB band (3.1–10.6 GHz). The experimental and simulated results demonstrate that the proposed antenna acquires an operating bandwidth of 117% (3–11.5 GHz) with a stable omnidirectional radiation pattern, about 89% of average radiation efficiency and 4.2 dBi of average gain with the maximum of 5.7 dBi at 10.2 GHz.
Źródło:
Journal of Telecommunications and Information Technology; 2018, 1; 70-76
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Antibacterial Activities of Some Transition Metal Schiff Base Complexes
Autorzy:
Islam, M.N.
Shahriar, S.M.S.
Islam, M.K.
Jesmin, M.
Ali, M.M.
Khanam, J.A.
Powiązania:
https://bibliotekanauki.pl/articles/411780.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
antibacterial activity
Schiff base transition metal complexes
minimum inhibitory concentration
Brine shrimp lethality
Opis:
A new series of four transition metal complexes of a Schiff base derived from salicylaldehyde and glycine, viz. [N-salicylidene glycinato diaqua cobalt (II) dimer] (SGCo)2, [N- salicylideneglycinato-di-aqua-nickel(ll)dimer] (SGN)2, [N-salicylideneglycinato-aqua-copper(II)] (SGC) and [N-salicylidene glycinato diaqua zinc(II) dimer] (SGZ)2 have been synthesized and characterized through a rapid, simple, and efficient methodology in excellent yield. These compounds were screened for in vitro antibacterial activities against six pathogenic bacteria, such as Shigella sonnei, Escherichia coli, Bacilus subtilis, Sarcina lutea, Staphylococcus aureus and Pseudomonas arioginosa. The antibacterial activity was determined by the disc diffusion method using DMSO as solvent. The results indicate that (SGC) compound exhibit a significant antibacterial activity, depending on the bacterial strain and (SGCo)2, (SGN)2 and (SGZ)2 compounds show a moderate sensitivity even with higher doses. All these compounds were found to possess cytotoxic effect.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 5; 12-20
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A 3D directive microwave antenna for biomedical imaging application
Autorzy:
Ullah, M. A.
Alam, T.
Islam, M. T.
Powiązania:
https://bibliotekanauki.pl/articles/200173.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
antenna
3D antenna
microwave sensor
microwave imaging
unidirectional
antena
antena 3D
czujnik mikrofalowy
obrazowanie mikrofalowe
Opis:
A directive three dimensional antenna, using folded radiating structure has been presented for the application of microwave imaging in clinical diagnosis. Two reflector walls have been introduced to achieve higher gain and directive radiation pattern along with the folding technique. The shorting wall technique is utilized to reduce the overall antenna size and to get resonance at a lower frequency. The proposed antenna obtained operating band at 1.67 GHz to 1.74 GHz. The dimension of the 3D radiating structure is 40£25£10.5 mm3. The antenna has an average realized gain of 5.2 dBi. Owing to the unidirectional radiation pattern, high gain and operating bandwidth within lower microwave frequency, the proposed antenna has potential to be used in microwave imaging for biomedical diagnosis. Also, the antenna has been utilized to compute an imaging phenomenon to detect abnormality in human head and result is presented. The design and simulation process are performed in the CST Microwave Studio software. The antenna is fabricated from 0.2 mm thick copper sheets. The results of the fabricated antenna are measured using PNA Network Analyzer (N5227A) and Satimo Star Lab.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 3; 355-360
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 60

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