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    Wyświetlanie 1-14 z 14
    Tytuł:
    Design of low power analog front-end for 13.56MHz RFID transponder
    Autorzy:
    Saleh, S.
    Osman, M.
    Hamdy, G.
    Zaki, A.
    Elsemary, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/397985.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    analog front frond
    RFID
    charge pump
    OOK
    pompa zasilająca
    Opis:
    This paper presents the design of 13.56MHz RF Front-end circuit for low-power medical applications. It converts RF power into DC and then extracts the clock and the data. The design includes rectifier, voltage multiplier, voltage regulator, data demodulator, ring oscillator, RF voltage limiter and LC matching network. It provides an excellent trade-off between high performance, simplicity of architecture, and low power consumption. It is designed to be fully integrated on chip. Simulation is done using 0.35-μm CMOS technology and the results are compared with other reported RFID systems. The total power consumption is adjusted to be around 4 μW at the minimum input power.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2017, 8, 4; 146-149
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calibration of reference torque transducer in one direction and use of its cubic coefficients in both directions with improved interpolation error
    Autorzy:
    Khaled, K. M.
    Osman, Seif M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2173893.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    torque
    calibration
    fitting function
    clockwise
    counterclockwise
    Opis:
    The current research work presents an investigation into use of the fitting coefficients resulting from the cubic curve fitting of the torque transducer calibration results in one direction to calculate the actual torque in the other torque direction with two methods: one is direct substitution with the nominal torque which gives a propagated linear relative interpolation error and the other is changing the sign of the second coefficient in the cubic function when using in the other torque direction. This proposed modification improves the absolute relative interpolation error by 5 to 16 times in the clockwise and counterclockwise directions based on the torque transducer’s classification.
    Źródło:
    Metrology and Measurement Systems; 2022, 29, 3; 539--551
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phosphate-induced changes in fatty acid biosynthesis in Chlorella sp. KS-MA2 strain
    Autorzy:
    Ahmad, A.
    Osman, S.M.
    Cha, T.S.
    Loh, S.H.
    Powiązania:
    https://bibliotekanauki.pl/articles/80623.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2016, 97, 4
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance of Symmetric Key Cryptography Algorithms in Cloud Storage
    Autorzy:
    Osman, Hind
    Ibrahim, Sara M.
    Ali, Elmustafa Sayed
    Powiązania:
    https://bibliotekanauki.pl/articles/1161999.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    AES
    BLOWFISH
    Cloud Computing
    DES
    Google Drive Storage
    NetBeans
    Opis:
    Today cloud computing becomes one of the most attractive topics due to the wide opportunities that is provided which aims to enhance the electronic services to a higher-level providing cost saving, expanding possibilities, storage in demand and the huge intake capability as well. Security is one of the most important process that should be implemented in every cloud structure level, especially with data in case of processing or storing to keep it save from unauthorized access to overcome the security challenges and difficulties, which face both provider and users in cloud. In this paper a study to compare the security algorithms for encryption/decryption files has been done to evaluate the performance impact with memory capacity, processing time and algorithms running time. The comparison has been done between three encryption algorithms AES, DES, and Blowfish to determine the performance of each one in cloud storage. From the experimental results we found that DES is faster in running time compared to other algorithms as well as AES considered to be the safest one in data protection.
    Źródło:
    World Scientific News; 2018, 112; 244-251
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microbiological criteria of tap water passed through some storage water tanks in Greater Cairo
    Autorzy:
    Osman, G. A.
    Kamel, M. M.
    Al-Herrawy, A. Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/363286.pdf
    Data publikacji:
    2010
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie
    Tematy:
    wskaźniki bakteryjne
    colifag
    wolno żyjąca ameba
    grzyby
    Pseudomonas aeruginosa
    gronkowce
    drożdże
    bacterial indicators
    coliphage
    free-living amoebae
    fungi
    staphylococci
    yeasts
    Opis:
    Shortage in drinking water supply led to an increase of pumping water to storage tanks and its redistribution to the consumers. The water quality may be changed according to the storage condition and to the deficiency in cleaning of those tanks. Water samples were taken from the tanks of Helwan and El-Giza governorates (Cairo, Egypt) and examined to evaluate microbial water quality. The results revealed that all water samples were free from total coliforms, faecal streptococci, sulphite reducing bacteria (clostridia), salmonellae groups and total vibrios. The total bacterial counts at 37°C and 22°C were 32 to 185 and 11 to 135 cfu*100ml-1, respectively. The total yeast and fungi counts were 9 to 66 and 4 to 35 cfu*100ml-1, respectively. Total counts of staphylococci (from 2 to 17 cfu*100ml-1), Pseudomonas aeruginosa (from 33 to 58 cfu*100ml-1), and coliphage (from 7 to 13 cfu*100ml-1) were also estimated. The free-living amoebae were detected in 75% of the examined storage water tank samples. According to the Egyptian standard for drinking water, most of the examined water samples were not acceptable for human consumption.
    Źródło:
    Environmental Biotechnology; 2010, 6, 2; 61-65
    1734-4964
    Pojawia się w:
    Environmental Biotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Integrated use of potassium and Ssoil mulching on growth and productivity of garlic (Allium sativum L.) under deficit irrigation
    Autorzy:
    Barakat, M.A.
    Osman, A.S.
    Semida, W.M.
    Mohammed, A.G.
    Powiązania:
    https://bibliotekanauki.pl/articles/11275.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Źródło:
    International Letters of Natural Sciences; 2019, 76
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dodatkowa profilaktyka tąpaniowa z wykorzystaniem strzelań w warstwach stropowych - doświadczenia KGHM Polska Miedź S.A. O/ZG „Rudna
    Additional prevention against tremors with the use of blasting in roof layers - tests of KGHM Polska Miedź S.A. "Rudna" coal mine
    Autorzy:
    Anderko, A.
    Laskowski, M.
    Mirek, A.
    Osman, R.
    Wróbel, J
    Powiązania:
    https://bibliotekanauki.pl/articles/165113.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Górnictwa
    Tematy:
    geologia
    górnictwo
    eksploatacja złoża
    profilaktyka tąpaniowa
    geology
    mining
    deposit exploitation
    prevention against tremors
    Opis:
    Przedstawiono przypadki stosowania w KGHM Polska Miedź S.A. O/ZG „Rudna" strzelań w warstwach stropowych w ramach profilaktyki tąpaniowej w różnych uwarunkowaniach geologiczno-górniczych. Omówiono genezę, przebieg i efektywność odprężenia górotworu strzelaniem długimi otworami w warstwach stropowych na przykładzie pól eksploatacyjnych G-23/1, G-1/7, X/1, G-7/5 i G-11/8. W przypadku pól G-23/1 i G-1/7, z uwagi na rodzaj użytego MW i długość otworów strzałowych rzędu 60 m, konieczne było opracowanie przez służby kopalni wielu szczegółów technicznych dotyczących konstrukcji i sposobu ładowania MW oraz jego zabezpieczenia przed wypadnięciem z otworu.
    This paper presents the cases of using blasting in roof layers in the framework of prevention against tremors in different geological and mining conditions, performed in KGHM Polska Miedź S.A. "Rudna" coal mine. It describes the origin, course and efficiency of rock mass decompression thanks to blasting with long blast-holes in roof layers on the example of exploitation fields G-23/1, G-1/7, X/1, G-7/5 and G-11/8. In cases of fields G-23/1 and G-1/7, it was necessary to develop a series of technical details, concerning the structure and manner of loading the blasting material and securing it against falling down the hole, because of the type of the used blasting material and the length of blast-holes amounting to 60m.
    Źródło:
    Przegląd Górniczy; 2015, 71, 2; 1-9
    0033-216X
    Pojawia się w:
    Przegląd Górniczy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An ecological protection for wood material by hydrolyzed feather keratin
    Autorzy:
    Turan, Mazlum
    Yeniocak, Mehmet
    Goktas, Osman
    Saltik, Burcin
    Alma, M. Hakki
    Powiązania:
    https://bibliotekanauki.pl/articles/2201352.pdf
    Data publikacji:
    2022
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
    Tematy:
    hydrolyzed keratin
    ecological preservation
    white rot
    brown rot
    water absorption
    Opis:
    Within the scope of this study, the hydrolyzed keratin which is an ecological and harmless material, was applied to the wood material surfaces by dipping and spraying method in different concentration rate 1%, 3% and 5%. Within the scope of the research, as wood materials Scots pine (Pinus sylvestris L.) and beech (Fagus orientalis L.) were used. Wood samples were exposed to white and brown rot fungi for 16 weeks and water absorption rate tests for 48-hour period to in order to determine protection performances. According to the results of the water absorption tests, it was observed that the keratin concentrations reduced the water absorption of wood material at least 7 times than control samples. Keratin concentrations were determined to reduce mass loss by at least 50% compared to control samples against rot fungus. As a result; it has been determined that keratin has positive effects on the protection of wood material in tests and that keratin substance can be applied as a natural preservative on wooden surfaces.
    Źródło:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2022, 65, 209; Art. no. 1644-3985.397.10
    1644-3985
    Pojawia się w:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectroscopy of 2-aminopurine: An MCSCF Study
    Autorzy:
    Rachofsky, E. L.
    Ross, J. B. A.
    Krauss, M.
    Osman, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1992724.pdf
    Data publikacji:
    1998-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    31.15.Ar
    31.50.+w
    33.20.Lg
    33.50.Dq
    Opis:
    2-aminopurine is a highly fluorescent isomer of adenine that can be incorporated into DNA as a probe of structure, dynamics, and protein-DNA interactions. Interpretation of the fluorescence of 2-aminopurine in DNA requires a model of the electronic structure of this fluorophore in its ground and excited states. To this end, electronic structures and energies of the ground and lowest singlet excited states of 2-amino-9-methylpurine were calculated by the multiconfiguration self-consistent field method supplemented by multiconfiguration perturbation theory. The molecular geometry was optimized in both of these electronic states to permit investigation of both electronic excitation and fluorescence emission. The predicted energies and transition dipoles were in good agreement with experiment. The permanent molecular dipole of 2-amino-9-methylpurine increased upon excitation, suggesting that both the absorption and emission spectra should shift to slightly lower energies in polar solvents. The anomalous spectral shifts observed in water suggest that 2-aminopurine undergoes hydrogen bonding that better stabilizes the ground state than the excited state. From the calculated electrostatic potentials of these two states, the position at which this hydrogen bond forms was predicted. These results form a basis for understanding the excited states and possible intermolecular interactions of 2-aminopurine in DNA.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 5-6; 735-748
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Titanium Nitride Thickness as a Support Layer for Carbon Nanotubes Growth
    Autorzy:
    Ramli, Muhammad M.
    Osman, Nurul H.
    Darminto, D.
    Abdullah, Mohd Mustafa Al Bakri
    Powiązania:
    https://bibliotekanauki.pl/articles/2125537.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    titanium nitride
    support layer
    carbon nanotubes
    interconnection
    Opis:
    The effect of titanium nitride (TiN) thickness as the support layer for carbon nanotubes (CNTs) growth was investigated by depositing three different thicknesses: 20 nm, 50 nm and 100 nm. This TiN support layer was deposited on SiO2 pads before depositing nickel (Ni) as the catalyst material. The Ni distribution on different TiN thicknesses was studied under hydrogen environment at 600°C. Then, the samples were further annealed at 600°C in acetylene and hydrogen environment for CNTs growth. The results show that, the optimum TiN thickness was obtained for 50 nm attributed by the lowest D to G ratio (0.8).
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 3; 963--966
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Residual strength and toughness after impact loading for RC slabs strengthened with different layers of geogrid
    Autorzy:
    Ahmed, Aya M. E.
    Hamdy, Osman
    Saad, Youssef L. Z.
    Ahmad, Seleem S. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/36064265.pdf
    Data publikacji:
    2023
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    impact load
    geogrid
    RC slab
    residual strength
    static flexural load
    toughness
    toughness index
    Opis:
    This study presents an experiment for investigating the residual strength and toughness of reinforced concrete, RC, and slab reinforced by a geogrid as shrinkage reinforcement along with lower tensile steel reinforcement. Three different parameters were considered, slab thickness, number of geogrid layers, and thickness of the upper concrete cover. Fifteen slab samples with sizes of 50 × 50 cm exposed to the impact load on its center before being re-load by the static load and six slab samples exposed to the static load only. The load and deflection relation were recorded through the static loading process for all specimens, where loading capacity, toughness, and toughness index were measured. The results show an enhancement in the slabs residual strength as the slab thickness and concrete cover increased. On the other hand, the residual strength of slabs has a remarkable decrease with the increase in geogrid layers. Moreover, the toughness has a positive relationship with the concrete cover and has an inverse relation with the slab thickness and the number of layers. A geogrid reduced the number and distribution of cracks and mitigated their severity, especially for double layers with the same concrete cover.
    Źródło:
    Scientific Review Engineering and Environmental Sciences; 2023, 32, 2; 117-134
    1732-9353
    Pojawia się w:
    Scientific Review Engineering and Environmental Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of reniform nematode, Rotylenchulus reniformis as biotic inducer of resistance against root-knot nematode, Meloidogyne incognita in potato
    Autorzy:
    Osman, H.A.
    Youssef, M.M.A.
    Youssef El-Gindi, A.E.M.
    Ameen, H.H.
    Abd-Hameid Abt-Elbary, N.
    Shawky Lashein, A.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/65443.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    A greenhouse experiment was conducted to evaluate the preinoculation of reniform nematode, Rotylenchulus reniformis for inducing resistance against Meloidogyne incognita in potato plants. Potato plants were inoculated with reniform nematode three days before the same plants received a root knot nematode inoculation. There was a reduction in the population parameters of the root knot nematode compared to plants given only a single inoculation. The studied potato plants which had two inoculations, also had enhanced growth parameters. The activity of the enzymes; peroxidase, polyphenol oxidase, and chitinase increased in the inoculated plants compared to the non-inoculated control.
    Źródło:
    Journal of Plant Protection Research; 2012, 52, 3
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Telemedicine services in the work of a doctor, dentist, nurse and midwife - analysis of legal regulations in Poland and the possibility of their implementation on the example of selected European countries
    Autorzy:
    Flaga-Gieruszyńska, K.
    Kożybska, M.
    Osman, T.
    Radlińska, I.
    Zabielska, P.
    Karakiewicz-Krawczyk, K.
    Jurczak, A.
    Karakiewicz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/28762988.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Medycyny Wsi
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2020, 27, 4; 680-688
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Challenges and opportunities for the future of icampuses
    Autorzy:
    Thomas, A. M.
    Shah, H.
    Moore, P.
    Evans, C.
    Sharma, M.
    Pham, H. V.
    Osman, K.
    Wilcox, A. J.
    Rayson, P.
    Chapman, C.
    Chima, P.
    Athwal, C.
    While, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/952933.pdf
    Data publikacji:
    2013
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    education
    icampus
    sensors
    context
    Web 2.0
    Opis:
    Meeting the educational needs of students currently requires moving toward collaborative electronic and mobile learning systems that parallel the vision of Web 2.0. However, factors such as data freedom, brokerage, interconnectivity and the Internet of Things add to a vision for Web 3.0 that will require consideration in the development of future campus-based, distance and vocational study. So, education can, in future, be expected to require deeper technological connections between students and learning environments, based on significant use of sensors, mobile devices, cloud computing and rich-media visualization. Therefore, we discuss challenges associated with such a futuristic campus context, including how learning materials and environments may be enriched by it. As an additional novel element the potential for much of that enrichment to be realized through development by students, within the curriculum, is also considered. We will conclude that much of the technology required to embrace the vision of Web 3.0 in education already exists, but that further research in key areas is required for the concept to achieve its full potential.
    Źródło:
    Computer Science; 2013, 14 (1); 5-25
    1508-2806
    2300-7036
    Pojawia się w:
    Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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