Autor: Rahman, F. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: A probabilistic model of Ancient Egyptian writing
Autorzy:: Nederhof, M.-J.
Rahman, F.
Tematy:: Ancient Egyptian
writing systems
language models; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Podstaw Informatyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/103801.pdf Link otwiera się w nowym oknie
Opis:: This article offers a formalization of how signs form words in Ancient Egyptian writing, for either hieroglyphic or hieratic texts. The formalization is in terms of a sequence of sign functions, which concurrently produce a sequence of signs and a sequence of phonemes. By involving a class of probabilistic automata, we can define the most likely sequence of sign functions that relates a given sequence of signs to a given sequence of phonemes. Experiments with two texts are discussed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Design of a nanoswitch in 130 nm CMOS technology for 2.4 GHz wireless terminals
Autorzy:: Bhuiyan, M. A.
Reaz, M. B. I.
Jalil, J.
Rahman, L. F.
Tematy:: CMOS
ISM band
nanometer
transceivers
T/R switch
wireless; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/200508.pdf Link otwiera się w nowym oknie
Opis:: This paper proposes a transmit/receive (T/R) nanoswitch in 130 nm CMOS technology for 2.4 GHz ISM band transceivers. It exhibits 1.03-dB insertion loss, 27.57-dB isolation and a power handling capacity (P1 dB) of 36.2-dBm. It dissipates only 6.87 μW power for 1.8/0 V control voltages and is capable of switching in 416.61 ps. Besides insertion loss and isolation of the nanoswitch is found to vary by 0.1 dB and 0.9 dB, respectively for a temperature change of 125°C. Only the transistor W/L optimization and resistive body floating technique is used for such lucrative performances. Besides absence of bulky inductors and capacitors in the schematic circuit help to attain the smallest chip area of 0.0071 mm2 which is the lowest ever reported in this frequency band. Therefore, simplicity and low chip area of the circuit trim down the cost of fabrication without compromising the performance issue.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Study on The Emulsion Stability of Tripropylene Glycol Diacrylate in Water
Autorzy:: Shirajuddin, Siti Salwa Mohammad
Abdullah, Mohd Mustafa Al Bakri
Ghazali, C.M.R.
Hussin, K.
Rahman, M.F.A.
Tematy:: emulsion
tripropylene glycol diacrylate
stability
Tween 20
waste tire dust; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/59110644.pdf Link otwiera się w nowym oknie
Opis:: Oil-in-water emulsion is thermodynamically unstable system that undergoes destabilization with time. The tripropylene glycol diacrylate (TPGDA) monomer which can potentially to increase the crosslink density of polymer blends is unstable in water due to its low water solubility properties. However, the stability of TPGDA emulsion could be improved by adding an adequate amount of surfactant. This study addresses the effect of different Tween 20 (surfactant) concentration on emulsion stability of TPGDA. Model emulsion ranging between 0.1 wt% to 3 wt% of Tween 20 and a control were prepared using heavy duty homogenizer. The emulsion was characterised by FTIR, microstructure analysis, phase separation observation and creaming index during storage time. Emulsion containing 0.4 wt% Tween 20 showed the longest stability at 24 hours and a creaming index of 0%, which is enough for an ideal emulsion. The FTIR spectra displayed the interaction of TPGDA and Tw-20, proving that the emulsion is fully mixed and stabilized. The results are further supported by optical microscopy, which observed no droplet aggregation and flocculation in the TPGDA emulsion with the presence of 0.4 wt% of Tw-20 surfactant. This information about Tw-20 is beneficial, making it a promising surfactant for enhancing the emulsion stability of the TPGDA emulsion.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Assessment of Radiological Dose around a 3-MW TRIGA Mark-II Research Reactor
Autorzy:: Rahman, A. F. M. M.
Shamsuzzaman, M.
Rahman, M. S.
Uddin, K.
Yeasmin, S.
Nazmul, Haque H. M.
Akramuzzaman, M. M.
Chakraborty, S. R
Tematy:: source term
release rate
TRIGA Mark-II reactor
dispersion
ingestion and deposition of radionuclide
Gaussian plume model
dose calculations; Pokaż więcej
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Powiązania:: https://bibliotekanauki.pl/articles/412377.pdf Link otwiera się w nowym oknie
Opis:: A hypothetical accidental case of a 3-MW TRIGA Mark-II research reactor has been assumed to assess the radiological consequences due to the deposition of 137Cs and 90Sr on ground, vegetation, milk and meat. The air concentrations in sixteen cardinal directions have been estimated where the maximum concentration has been found to be at 110 m distance from the core of the reactor for all the directions. Calculated maximum doses of 137Cs, 90Sr and both 137Cs and 90Sr have been found to be within the ranges of 0.005-0.014 μSv hr–1, 0.013-0.036 μSv hr–1 and 0.018-0.05 μSv hr–1, respectively for all the directions, which are below the measured background dose limit 0.25 μSv hr–1 and also within the IAEA acceptable dose rate limit of 0.5 μSv hr–1. The calculated low doses due to the aforementioned radionuclides can be considered negligible with regard to the radiation hazards. The relationship between total effective dose rate for various pathways (i.e. immersion, inhalation, ground deposition, and ingestion of contaminated vegetation, milk, meat) and air concentration in all the directions has been established. Obtained relation reveals that the total effective dose rate is directly proportional to the air concentration, and the overall proportionality constants for 137Cs and 90Sr radionuclides have been obtained as 0.57 and 0.28, respectively. This study might provide information on the radiological safety required for the radiation protection purposes of the people living in the vicinity of the reactor site.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Reducing Creep Rate of polypropylenes by Soaking Solid solutions of CaCO3
Autorzy:: Hussain, Randa K.
Dagher, Hala F.
Khudadad, Rasol Rahman
Tematy:: creep
polypropylene
calcium carbonate
creep rate; Pokaż więcej
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Powiązania:: https://bibliotekanauki.pl/articles/1182918.pdf Link otwiera się w nowym oknie
Opis:: The creep behavior of Polypropylene and Polypropylene/Calcium Carbonate were investigated by tested them at different concentration of Calcium carbonate filler (filler addition is done by soaked pp samples in CaCO3 solution) at different temperatures. A dramatically changed in the FTIR was observed when pp soaked in CaCO3 solution comparing with pristine one. It was found that the creep rate was lowered comparing to the pure Polypropylene. The Creep behavior of the polymer formed was observed to increase with increase in temperature and stress, Calcium carbonate enhanced creep rate and rapture time.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Capital asset pricing model in market overreaction conditions : evidence from Indonesia Stock Exchange
Model wyceny aktywów kapitałowych w warunkach nadmiernej reakcji rynku : przypadek giełdy papierów wartościowych w Indonezji
Autorzy:: Sembiring, F. M.
Rahman, S.
Effendi, N.
Sudarsono, R.
Tematy:: beta
CAPM
contrarian strategy
market overreaction
returns reversal
przeciwstawna strategia
nadmierna reakcja rynku
zmiana zwrotu; Pokaż więcej
Wydawca:: Politechnika Częstochowska
Powiązania:: https://bibliotekanauki.pl/articles/405200.pdf Link otwiera się w nowym oknie
Opis:: Market overreaction is a phenomenon in stock markets characterized by a return reversal on the stocks which resulted winners into a losers, vice versa, losers into a winners. While the CAPM is the model of asset pricing which puts the market risk factor as the sole determinant of return. The purpose of this study is testing whether market overreaction occurred in Indonesia stock market and whether Capital Asset Pricing Model (CAPM) can explain the portfolio return of the winners and the losers. This study uses the stocks of non-financial sector companies in Indonesia Stock Exchange during the period July 2005-December 2015. Abnormal returns for each stock obtained by using a market model and the portfolio formed by using the method of 6-6 observation period. The results of this study are: (1) Market overreaction occurs in the Indonesia stock market characterized by a return reversal of the winners and the losers, and (2) CAPM which only considers the market risk factors in the model tend to be able to explain the portfolio return.
Nadmierna reakcja rynku jest zjawiskiem spotykanym na giełdach papierów wartościowych cechujących się zmianą sytuacji rynkowej papierów wartościowych, co czyni ze zwycięzców przegranych i odwrotnie, z przegranych zwycięzców. Model Wyceny Aktywów Kapitałowych (ang. CAPM) jest modelem wyceny aktywów, który stawia czynnik ryzyka rynkowego jako jedyny wyznacznik zwrotu. Celem tego badania jest przetestowanie, nadmiernej reakcji rynku, która wystąpiła na indonezyjskiej giełdzie papierów wartościowych oraz określenie, czy model wyceny aktywów kapitałowych (CAPM) może wyjaśnić zwrot portfela zwycięzców i przegranych. Niniejsze badanie wykorzystuje akcje spółek sektora niefinansowego na giełdzie papierów wartościowych w Indonezji w okresie od lipca 2005 do grudnia 2015. Nieprawidłowe zwroty od każdego papieru wartościowego uzyskano za pomocą modelu rynku i portfela wykonanego przez użycie metody 6-6 okresu obserwacji. Wyniki tego badania są następujące: (1) nadmierna reakcja rynku pojawiająca się na giełdzie w Indonezji charakteryzuje się odwróceniem zwrotu zwycięzców i przegranych, oraz (2) model CAPM, który uznaje tylko czynniki ryzyka rynkowego ma tendencję do wyjaśnienia zwrotu portfela.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Optimization of fresh palm oil mill effluent biodegradation with Aspergillus niger and Trichoderma virens
Autorzy:: Jalaludin, N.
Rahman, R. A.
Razali, F.
Barghash, H. F. A.
Sukri, S. S. M.
Tematy:: Aspergillus niger
optimization
POME
palm oil mill effluent
Trichoderma virens; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/204704.pdf Link otwiera się w nowym oknie
Opis:: In this work, response surface optimization strategy was employed to enhance the biodegradation process of fresh palm oil mill effluent (POME) by Aspergillus niger and Trichoderma virens. A central composite design (CCD) combined with response surface methodology (RSM) were employed to study the effects of three independent variables: inoculum size (%), agitation rate (rpm) and temperature (°C) on the biodegradation processes and production of biosolids enriched with fungal biomass protein. The results achieved using A. niger were compared to those obtained using T. virens. The optimal conditions for the biodegradation processes in terms of total suspended solids (TSS), turbidity, chemical oxygen demand (COD), specific resistance to filtration (SRF) and production of biosolids enriched with fungal biomass protein in fresh POME treated with A. niger and T. virens have been predicted by multiple response optimization and verified experimentally at 19% (v/v) inoculum size, 100 rpm, 30.2°C and 5% (v/v) inoculum size, 100 rpm, 33.3°C respectively. As disclosed by ANOVA and response surface plots, the effects of inoculum size and agitation rate on fresh POME treatment process by both fungal strains were significant.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

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.
Wydawca:: Polskie Towarzystwo Botaniczne
Powiązania:: https://bibliotekanauki.pl/articles/27828.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Factors Affecting the Performance of Double Chamber Microbial Fuel Cell for Simultaneous Wastewater Treatment and Power Generation
Autorzy:: Khan, M.R.
Amin, M.S.A.
Rahman, M.T.
Akbar, F.
Ferdaus, K.
Tematy:: catholyte
COD
Microbial Fuel Cell
wastewater treatment; Pokaż więcej
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Powiązania:: https://bibliotekanauki.pl/articles/779340.pdf Link otwiera się w nowym oknie
Opis:: Electricity generation from the readily biodegradable organic substrate (glucose) accompanied by decolorization of azo dye was investigated using a two-chamber microbial fuel cell (MFC). Batch experiments were conducted to study the effect of dye and substrate concentration on MFC performance. Electricity generation was not signifi cantly affected by the azo dye at 300 mg/L, while higher concentrations inhibited electricity generation. The chemical oxygen demand (COD) removal and decolorization of dye containing wastewater used in the MFC were studied at optimum operation conditions in anode and cathode, 57% COD removal and 70% dye removal were achieved. This study also demonstrated the effect of different catholyte solutions, such as KMnO4 and K2Cr2O7 on electricity generation. As a result, KMnO4 solution showed the maximum electricity generation due to its higher standard reduction potential.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Synthesis of silver nanoparticles by aqueous extract of Zingiber officinale and their antibacterial activities against selected species
Autorzy:: Hussain, Zawar
Jahangeer, Muhammad
ur Rahman, Shafiq
Ihsan, Tamanna
Sarwar, Abid
Ullah, Najeeb
Aziz, Tariq
Alharbi, Metab
Alshammari, Abdulrahman
Alasmari, Abdullah F.
Tematy:: Nanotechnology
Antibacterial activity
Silver-nanoparticles
green synthesis
Ginger; Pokaż więcej
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Powiązania:: https://bibliotekanauki.pl/articles/27315653.pdf Link otwiera się w nowym oknie
Opis:: Silver nanoparticles have special plasmonic and antibacterial characteristics that make them efficient in a variety of commercial medical applications. According to recent research, chemically synthesized silver nanoparticles are harmful even in low concentrations. It was crucial to identify appropriate synthesis methods that may have low costs and be nontoxic to the environment. Zingiber officinale (ginger) extracts used to prepare silver nanoparticles were inexpensive and environmentally friendly, and the best physicochemical characteristics were analyzed. Silver nanoparticles were characterized by using UV-visible spectroscopy, Scanning electron microscopy (SEM), and X-ray diffraction (XRD). The surface Plasmon resonance peak at 425 nm was observed using UV-Visible spectroscopy. Scanning electron microscopy observed that the nanoparticles were spherical and ranged in size from 5 to 35 nm. The XRD pattern values of 2θ: 38.2° , 46.3° , and 64.58° are used to determine the planes (111), (200), and (220). The silver nanoparticle’s existence was verified by the face-centered cubic (FCC). Silver nanoparticles were found to have antibacterial efficacy against gram-positive Staphylococcus and gram-negative bacteria such as Pseudomonas aeruginosa, Klebsiella Aerogenes, Salmonella, Staphylococcus and Escherichia coli. The antibacterial activity of silver nanoparticles was observed using the agar well diffusion (AWD) method at three different concentrations (100 μg/ ml, 75 μg/ml, and 50 μg/ml). The zone of inhibition measured against the bacterial strains pseudomonas Aeruginosa, Klebsiella aerogenes, Escherichia coli, Salmonella and Staphylococcus which were (18.4±1.25 mm, 16.9±0.74 mm, 14.8±1.25 mm), (16.8±0.96 mm, 14.6±0.76 mm, 14.0±1.15 mm), (19.7±0.76 mm, 18.2±0.66 mm, 15.4±1.15 mm), (16.6±0.67 mm, 14.2±0.23 mm, 12.8±0.78 mm) and (12±0.68 mm, 10±0.20 mm, 08±0.15 mm). These nanoparticles’ potent antibacterial properties may enable them to be employed as nanomedicines for a variety of gramnegative bacterial illness treatments.
Dostawca treści:: Biblioteka Nauki

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