Autor: Islam, M.A. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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

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Skocz do pozycji: 2.

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

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Skocz do pozycji: 3.

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

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Skocz do pozycji: 4.

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

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Skocz do pozycji: 5.

Tytuł:: Application of Virtual Reality for Remote Ship Inspections and Surveys – A Systematic Review
Autorzy:: Sheriff, A.
Anantharaman, M.
Islam, R.
Nguyen, H. O.
Powiązania:: https://bibliotekanauki.pl/articles/24201482.pdf
Data publikacji:: 2023
Wydawca:: Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:: international transport
real time
unmanned aerial vehicle
remote control
virtual reality
flag state duty
coronavirus pandemic
Opis:: The use of virtual reality for the establishment of compliance is a potential game-changer in enabling real-time remote inspections/ surveys of vessels. When provided with high-speed internet access, robots or remote-controlled inspection vehicles such as drones, crawlers, unmanned aerial vehicles (UAVs), and so on, may be equipped with remote inspection technologies (RITs), and smart optical cameras and sensor suites in conjunction with wearable technologies, and smart/ mobile devices, to carry out an aerial and underwater virtual assessment of the coating condition of the steel structural members of the vessel while transmitting the data in real-time or near real-time, via collaborative software. To ease the travel restrictions and border closures prompted by the Coronavirus (COVID-19), these novel technologies have been introduced by some flag states and classification as alternatives to traditional in-person statutory inspections/ class surveys. This study aims to employ a systematic literature review (SLR) approach to (1) classify the profiles of existing publications related to remote inspections/ surveys, (2) highlight the key thematic areas being discussed within the domain of remote inspections/ surveys and identify tasks and processes that may require virtual reality application. To the best of our knowledge, the findings have revealed that there is no existing SLR paper related to the application of remote inspection techniques in ship inspections/ surveys. However, the review retrieved 28 primary studies from the following databases: Scopus, Web of Science, Science Direct, and Google Scholar. Based on the results, various studies have proposed multifarious solutions to overcoming the existing technical and regulatory barriers to the mass deployment of these cutting-edge technologies.
Źródło:: TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 3; 587--594
2083-6473
2083-6481
Pojawia się w:: TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Significant Influence of Annealing Temperature and Thickness of Electrode on Energy Conversion Efficiency of Dye Sensitized Solar Cell: Effect of Catalyst
Autorzy:: Uddin, J.
Islam, J. M. M.
Khan, S. M. M.
Hoque, E.
Khan, M. A.
Powiązania:: https://bibliotekanauki.pl/articles/412298.pdf
Data publikacji:: 2014
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Dye Sensitized Solar Cell
sensitizer
catalyst
annealing temperature
thickness
Opis:: Dye sensitized solar cell (DSSC) shows great promise as an alternative to conventional p-n junction solar cells due to their low fabrication cost and reasonably high efficiency. DSSC was assembled by using natural dye extracted from red amaranth (Amaranthus Gangeticus) as a sensitizer and different catalysts for counter electrode were applied for maximum energy conversion efficiency. Annealing temperature and thickness of electrode were also investigated and optimized. Catalyst, annealing temperature and thickness were optimized by the determination of cell performance considering photoelectrochemical output and measuring current and voltage; then calculating efficiency and other electrical parameters. The experimental results indicated that samples having 40 μm electrode thickness and prepared at 450 ^o C annealing temperature showed the best performance.
Źródło:: International Letters of Chemistry, Physics and Astronomy; 2014, 20, 1; 78-87
2299-3843
Pojawia się w:: International Letters of Chemistry, Physics and Astronomy
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Impact of defective turbocharging system on the safety and reliability of large marine diesel engine
Autorzy:: Anantharaman, M.
Islam, R.
Sardar, A.
Garaniya, V.
Khan, F.
Powiązania:: https://bibliotekanauki.pl/articles/1841550.pdf
Data publikacji:: 2021
Wydawca:: Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:: marine power plant
diesel engine
large marine diesel engine
turbocharging system
safety and reliability
Fault Tree Analysis
main engine
maximum continuous rating
Opis:: Today huge capacity sea-going vessels are propelled by mega high-powered marine diesel engines, referred to as Main Engine. Turbocharging system is an integral part of large marine diesel engine plant, contributing to their safety, reliability, and efficiency. Defects in the turbocharging system could result in higher fuel consumption, erratic running of the Main Engine, and in the worst scenario may result in the stoppage of the Main Engine at sea. An inefficient turbocharging system may also cause major damage to turbochargers, resulting in undesirable accidents out at sea. To avoid such undesirable accidents and ensure smooth operations of the Main Engine, it is required to address this concern. The aim of this research is to study the turbocharging system for a large Main Engine using a Kongsberg engine simulator. Various malfunction of the Turbocharging system is considered, relevant data is collected and analysed. Moreover, a Fault Tree Analysis, (FTA) is considered to identify the top undesirable event which is the failure of the Main Engine. Based on the results of this study, various steps are suggested to avoid failure of the Main Engine due to the defective turbocharging system.
Źródło:: TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2021, 15, 1; 189-198
2083-6473
2083-6481
Pojawia się w:: TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Thermal Properties of Carbon Nanotube (CNT) Reinforced Polyvinyl Alcohol (PVA) Composites
Autorzy:: Hasan, M.
Das, S. K.
Islam, J. M. M.
Gafur, Md. A.
Hoque, E
Khan, M. A.
Powiązania:: https://bibliotekanauki.pl/articles/411675.pdf
Data publikacji:: 2013
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: CNT
PVA
composite
Thermal properties
Gum acacia
Opis:: Homogeneous Polyvinyl alcohol (PVA)/Carbon nanotube (CNT) composite has been prepared by solution casting method using gum acacia as a surfactant. CNT content in the composite was varied from 5-10 % by weight. The thermal properties of PVA/CNT composites were investigated by Thermo Gravimetric/Differential Thermal Analyzer (TG/DTA) and Thermo Mechanical Analyzer (TMA). TG/DTA results showed that higher thermal stability in higher percentage of CNT in the composites. The 10 % CNT containing PVA composite exhibit highest onset of melting, glass transition point and offset of melting temperature and the recoded values are 330.4K, 379K and 421.3K respectively. All of the result indicates that the developed PVA/CNT composite might be promising for use in solar cell application.
Źródło:: International Letters of Chemistry, Physics and Astronomy; 2013, 12; 59-66
2299-3843
Pojawia się w:: International Letters of Chemistry, Physics and Astronomy
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Development of Electrically Conductive Nanocrystalline Thin Film for Optoelectronic Applications
Autorzy:: Das, S K.
Islam, J. M. M.
Hasan, M.
Kabir, H.
Gafur, Md. A.
Hoque, E.
Khan, M. A.
Powiązania:: https://bibliotekanauki.pl/articles/412543.pdf
Data publikacji:: 2013
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Conductive thin film
Composite
TiO2
Solar cell
Optoelectronics
Sodium alginate
Opis:: Sodium alginate (TiO2) sand composites were prepared by solution casting. Purified sand was added in the composite films to increase electrical conductivity. Electrical properties such as conductivity, capacitance, dielectric constant, and loss tangent of the composites were investigated. The current voltage characteristics for all the composites showed ohmic behavior. All the electrical properties have been found to improve with the incorporation of sand (SiO2) but 6 % sand containing composite exhibits the best electrical properties. The mechanical properties tensile strength (TS), elongation at break (Eb) and Young modulus for 6 % sand containing composite film are found to be 4.445 MPa, 9.76 %, and 72.8 MPa respectively. The experimental results reveal that the blended films exhibit higher stability and improved mechanical properties of both tensile strength and elongation at break in dry state. Water absorption properties of the composites are found to decrease with the increase of sand content. Lowest water uptake properties and highest stability were demonstrated by 6 % sand containing sample. Electrically conductive composite films have useful applications for solar cells and optoelectronics. Thus, this study is very much expected to aid in the design and selection of proper composite for the potential application of solar cell and optoelectronics.
Źródło:: International Letters of Chemistry, Physics and Astronomy; 2013, 10, 1; 90-101
2299-3843
Pojawia się w:: International Letters of Chemistry, Physics and Astronomy
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Chitosan biostimulant controls infection of cucumber by Phytophthora capsici through suppression of asexual reproduction of the pathogen
Biostymulant chitozan kontroluje zakażenie ogórka przez Phytophthora capsici poprzez hamowanie bezpłciowego rozmnażania patogen
Autorzy:: Zohara, F.
Surovy, M.Z.
Khatun, A.
Prince, F.R.K.
Ankada, A.M.
Rahman, M.
Islam, T.
Powiązania:: https://bibliotekanauki.pl/articles/27828.pdf
Data publikacji:: 2019
Wydawca:: Polskie Towarzystwo Botaniczne
Opis:: The biopolymer chitosan is a derivative of chitin, which can promote plant growth and protect plants from phytopathogens. This study aimed to evaluate the efficacy of chitosan as a biostimulant and a biorational agent to protect cucumber plants from damping-off disease caused by Phytophthora capsici. Cucumber seeds were treated with a range of chitosan concentrations, viz. 0, 125, 250, and 500 ppm, to evaluate effect on seed germination and fresh root and shoot weight of the seedlings. Chitosan significantly (p ≤ 0.05) enhanced seed germination and root and shoot growth of cucumber in a dose-dependent manner up to 500 ppm. Application of in vitro chitosan suspension onto P. capsici mycelial plug suppressed growth of mycelia, formation of sporangia, and release of P. capsici zoospores at 125–500 ppm concentrations. Cucumber seedlings from chitosan-treated seeds showed enhanced resistance to damping-off disease caused by P. capsici compared to untreated control. Cucumber seedlings from 500 ppm chitosan seed treatment showed 100% disease resistance against damping off caused by P. capsici. These results suggest that chitosan could be used as a natural and environmentally safe alternative to a synthetic growth promoter and pesticide for sustainable production of cucumber.
Biopolimer chitozan jest pochodną chityny, może on stymulować wzrost roślin i chronić je przed fitopatogenami. Celem badań była ocena skuteczności chitozanu jako biostymulatora i „bioracjo-nalnego” środka ochrony ogórka przed zgorzelą wywołaną przez Phytophthora capsici. Nasiona ogórka poddano działaniu różnych stężeń chitozanu tj. 0, 125, 250 i 500 ppm w celu oceny ich wpływu na kiełkowanie nasion oraz świeżą masę korzeni i pędów siewek. Chitozan istotnie (p ≤ 0,05) stymulował kiełkowanie nasion oraz wzrost korzeni i pędów ogórka w sposób zależny od dawki do 500 ppm. Zastosowanie zawiesiny chitozanu w zakresie stężeń 125–500 ppm w warunkach in vitro hamowało wzrost grzybni P. capsici, tworzenie sporangiów i uwalnianie zoospor P. capsici. Siewki roślin uzyskanych z nasion traktowanych chitozanem charakteryzowały się zwiększoną odpornością na zgorzel wywołaną przez P. capsici w porównaniu z nietraktowanych chitozanem. Siewki ogórków z nasion traktowanych 500 ppm chitozanu wykazywały 100% odporność na zgorzel powodowaną przez P. capsici. Wyniki te sugerują, że chitozan może być stosowany jako naturalna i bezpieczna dla środowiska alternatywa dla syntetycznych stymulatorów wzrostu oraz pestycydów w zrównoważonej produkcji ogórka.
Źródło:: Acta Agrobotanica; 2019, 72, 1
0065-0951
2300-357X
Pojawia się w:: Acta Agrobotanica
Dostawca treści:: Biblioteka Nauki

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