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    Wyświetlanie 1-9 z 9
    Tytuł:
    Dimming control schemes combining IEEE 802.15.7 and SC-LPPM modulation schemes with an adaptive M-QAM OFDM for indoor LOS VLC systems
    Autorzy:
    Mohammed, Nazmi A.
    Badawi, Kareem A.
    Khalaf, Ashraf A. M.
    El-Rabaie, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818236.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    visible light communication
    sub-carrier pulse position modulation
    lightning topologies
    bit error rate
    Opis:
    The presented work proposes a new dimming control schemes for indoor visible light communication which combines variable pulse-position modulation, colour shift keying as key schemes of IEEE 802.15.7 standard, and sub carrier-pulse-position modulation as a pulse-position modulation variant with orthogonal frequency division multiplexing. These schemes are then compared with traditional merging schemes utilizing pulse-width modulation and multiple pulse-position modulation with m-ary quadrature amplitude modulation OFDM. The proposed schemes are investigated in a typical room with a different lighting layout (i.e., distinctive and uniform lighting layout), followed by an illumination investigation to evaluate the performance of the proposed schemes, especially the enhanced achieved data rates, and to determine their limitations as reliable visible light communication systems that can satisfy both communication and illumination requirements.
    Źródło:
    Opto-Electronics Review; 2020, 28, 4; 203--212
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dimming control schemes combining IEEE 802.15.7 and SC-LPPM modulation schemes with an adaptive M-QAM OFDM for indoor LOS VLC systems
    Autorzy:
    Mohammed, Nazmi A.
    Badawi, Kareem A.
    Khalaf, Ashraf A. M.
    El-Rabaie, El-Sayed
    Powiązania:
    https://bibliotekanauki.pl/articles/1818230.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    visible light communication
    sub-carrier pulse position modulation
    lightning topologies
    bit error rate
    Opis:
    The presented work proposes a new dimming control schemes for indoor visible light communication which combines variable pulse-position modulation, colour shift keying as key schemes of IEEE 802.15.7 standard, and sub carrier-pulse-position modulation as a pulse-position modulation variant with orthogonal frequency division multiplexing. These schemes are then compared with traditional merging schemes utilizing pulse-width modulation and multiple pulse-position modulation with m-ary quadrature amplitude modulation OFDM. The proposed schemes are investigated in a typical room with a different lighting layout (i.e., distinctive and uniform lighting layout), followed by an illumination investigation to evaluate the performance of the proposed schemes, especially the enhanced achieved data rates, and to determine their limitations as reliable visible light communication systems that can satisfy both communication and illumination requirements.
    Źródło:
    Opto-Electronics Review; 2020, 28, 4; 203--212
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Passive Mixer-based UWB Receiver with Low Loss, High Linearity and Noise-cancelling for Medical Applications
    Autorzy:
    Kareem, Thaar A.
    Trabelsi, Hassen
    Powiązania:
    https://bibliotekanauki.pl/articles/2200699.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    WBAN
    UWB receiver
    LNA
    passive mixer
    linearity
    port isolation
    Opis:
    A double balanced passive mixer-based receiver operating in the 3-5 GHz UWB for medical applications is described in this paper. The receiver front-end circuit is composed of an inductorless low noise amplifier (LNA) followed by a fully differential voltage-driven double-balanced passive mixer. A duty cycle of 25% was chosen to eliminate overlap between LO signals, thereby improving receiver linearity. The LNA realizes a gain of 25.3 dB and a noise figure of 2.9 dB. The proposed receiver achieves an IIP3 of 3.14 dBm, an IIP2 of 17.5 dBm and an input return loss (S11) below -12.5dB. Designed in 0.18μm CMOS technology, the proposed mixer consumes 0.72pW from a 1.8V power supply. The designed receiver demonstrated a good ports isolation performance with LO_IF isolation of 60dB and RF_IF isolation of 78dB.
    Źródło:
    International Journal of Electronics and Telecommunications; 2023, 69, 1; 61--67
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of a flexible process layout for a Nigerian beverage industry
    Autorzy:
    Kareem, B.
    Oke, P. K.
    Lawal, A. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/409099.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    process layout
    flexibility
    new product
    global standards
    Opis:
    Product design is changing everyday as a result of changing in taste of the customers. Production layout must be flexible to cater for these changes. Production layout is flexible if it can accommodate change in flow of workers, material and machines in compliance with the new product demand. In this study, flexible process layout was developed for a Nigerian beverage industry to take care of future change in product design. In the industry, flexibility was considered in redesigning of old production layout in the areas of industrial facility, and operational planning. It was discovered that old layout was deficient in the area of flexibility by 90% of the set standards of the criteria for plant layout. The findings have indicated that the flexibility in plant layout is cardinal in combarting the challenge of changing industrial environment.
    Źródło:
    Research in Logistics & Production; 2013, 3, 1; 37-47
    2083-4942
    2083-4950
    Pojawia się w:
    Research in Logistics & Production
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling fatalities of road accidents in Nigeria
    Autorzy:
    Kareem, B.
    Oke, P. K.
    Lawal, A. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/409425.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    traffic
    population
    road accidents
    fatalities
    regression
    Opis:
    Preponderance of road accidents is one of the major causes of death in Nigeria, but the fatality of these accidents is unknown. In this study, data on casualties of the road accidents in Nigeria are collated, statistically analysed and modelled for predicting fatality of the accidents. The strategies of minimising rise in fatality of road accidents were proposed. The results obtained showed that the fatalities of the road accidents have polynomial relationships with the population of the road users, or time. The highest annual accident fatality probability of 0.17 was obtained over the total population of the road users. The result from combined modelling of traffic population and time showed that the accident fatalities will rise in future unless roads and drivers are well cultured. The findings would be useful for demographers, safety and health workers in their planning.
    Źródło:
    Research in Logistics & Production; 2012, 2, 3; 259-271
    2083-4942
    2083-4950
    Pojawia się w:
    Research in Logistics & Production
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimation of the density and cumulative distribution functions of the exponentiated Burr XII distribution
    Autorzy:
    Hassan, Amal S.
    Assar, Salwa M.
    Ali, Kareem A.
    Nagy, Heba F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1917020.pdf
    Data publikacji:
    2021-12-08
    Wydawca:
    Główny Urząd Statystyczny
    Tematy:
    exponentiated Burr Type XII model
    least squares estimator
    maximum likelihood estimator
    uniform minimum variance unbiased estimator
    weighted least squares estimator
    Opis:
    The exponentiated Burr Type XII (EBXII) distribution has wide applications in reliability and economic studies. In this article, the estimation of the probability density function and the cumulative distribution function of EBXII distribution is considered. We examine the maximum likelihood estimator, the uniformly minimum variance unbiased estimator, the least squares estimator, the weighted least squares estimator, the maximum product spacing estimator, the Cramér–von-Mises estimator, and the Anderson–Darling estimator. We derive analytical forms for the bias and mean square error. A simulation study is performed to investigate the consistency of the suggested methods of estimation. Data relating to the wind speed and service times of aircraft windshields are used with the studied methods. The simulation studies and real data applications have revealed that the maximum likelihood estimator performs more efficiently than its remaining counterparts.
    Źródło:
    Statistics in Transition new series; 2021, 22, 4; 171-189
    1234-7655
    Pojawia się w:
    Statistics in Transition new series
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The light microscopy and ultrastructural characteristics of Myxobolus naffari (Myxosporea, Myxobolidae) infecting the Nile carp Labeo niloticus (Cyprinidae) and its histological impact
    Autorzy:
    Ardalan, Naksheen M.
    Al-Hashimi, Salam F.
    El Garhy, Manal
    Hamdi, Salwa A.H.
    Al Ghamdi, Ali
    Morsy, Kareem
    Powiązania:
    https://bibliotekanauki.pl/articles/972261.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Parazytologiczne
    Tematy:
    parasite
    morphology
    ultrastructure
    Myxobolus naffari
    Myxosporea
    Labeo niloticus
    Opis:
    During a survey of myxosporean parasites infecting freshwater fishes from the River Nile at Giza Governorates, Egypt between March and September 2016, nine out of 30 specimens of the Nile carp Labeo niloticus (Cyprinidae) were found to be naturally infected with Myxobolus naffari (Myxobolidae). Small macroscopic plasmodia appeared embedded in the host gill tissue accompanied with fusion of the gill epithelia, and atrophy was observed at the site of infection. The host reaction was manifested by the encapsulation of the plasmodia with a thick layer of connective tissue. The plasmodia appeared as white, elongated rods between gill filaments with an intensity ranging from three to eight cysts/fish. The average dimensions of plasmodia were 1.2–2.0 (1.8 ± 0.2) mm long × 0.4–0.7 (0.6 ± 0.2) mm wide. The spores were oval, reaching 9.56–11.2 (10.2 ± 0.2) μm long and 6.5–7.7 (7.0 ± 0.4) μm wide with two equal-sized polar capsules regularly arranged at the anterior pole of each spore. They were 4.51–5.5 (5.1 ± 0.4) μm in length and 1.5–2.0 (1.7 ± 0.2) μm in width. Histological, semi-thin sections were taken through parasite plasmodia and transmission electron microscopic examination of ultrathin sections was performed to describe the developmental stages of the recorded parasite within the host fish.
    Źródło:
    Annals of Parasitology; 2017, 63, 3; 159-165
    0043-5163
    Pojawia się w:
    Annals of Parasitology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydrogeochemical processes and evaluation of groundwater in Al-Salman area – Iraqi Southern Desert
    Autorzy:
    Al-Mutawqi, Kareem Ghafel
    Ewaid, Salam Hussein
    Abed, Salwan Ali
    Al-Ansari, Nadhir
    Salim, Mudhafar A.
    Kadhim, Ameer J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1841953.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    Dammam formation
    Durov diagram
    facies
    Gibbs diagram
    groundwater
    hydrogeochemical processes
    Iraqi Southern Desert
    major ions
    Piper diagram
    Opis:
    A field survey has been conducted for the study area using the Global Positioning System (GPS) and geological and geomorphological maps of the area. The study area is one of the important areas in Iraq characterized by scarce water resources. The purpose of the study is to determine the hydro-chemical processes and their relationship to groundwater quality carried out in the southwestern desert region of Iraq, where the region lacks extensive studies of water resources. Twenty-eight groundwater samples were collected from wells distributed between the eastern borders of Saudi Arabia and the West Bank of the Euphrates River. For the purpose of hydrogeochemical analyses, the Fetter method was used to collect and examine samples. A large part of the recharge area is located in Saudi Arabia, where the groundwater bearing aquifer represented by the Dammam formation extends to Iraq and Saudi Arabian International borders. The analysis determined the order of cations (Na+ > Ca2+ > Mg2+ > K+) and anions (Cl– > SO42– > HCO3–). High values of the variation coefficient (CV) correspond to the concentration of potassium, sodium and chloride ions (CV: 68.7, 64.7 and 64 respectively). To identify the hydrochemical water facies, the Piper diagram was used. It was found that 53% of the water samples belong to the Na-Cl type and 40% are of the Ca-Mg-Cl type, while the rest of the samples are the Ca-Cl type. To identify geochemical processes, it was found that ion exchange processes via chloroalkaline indices 1 and 2 are prevalent between Ca2+, Mg2+ in the groundwater and Na+, K+ in water bearing rocks. To learn more about the processes that led to the concentration of certain ions, such as sodium, it was found that they tend to be of silicate minerals related to surface runoff of water in recharge areas and carbonic rocks. It was also found that rock / soil-groundwater interaction and evaporation processes were the formal processes in the saturated zone and evaporation in the unsaturated zone are prevalent processes of groundwater ion concentration.
    Źródło:
    Journal of Water and Land Development; 2021, 50; 220-228
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pre-harvest foliar application of vegetables extract improves the quality of harvested grape
    Autorzy:
    Abbasi, N.A.
    Kareem, A.
    Hafiz, I.A.
    Qureshi, A.A.
    El-Gioushy, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/12692459.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Tematy:
    plant cultivation
    grapevine
    Vitis vinifera
    Perlette cultivar
    King Ruby cultivar
    grape
    fruit
    vegetable extract
    pre-harvest application
    foliar application
    total soluble solid
    total phenolics content
    ascorbic acid content
    quality improvement
    fruit quality
    fruit storage
    Opis:
    This study focused on examining the effect of vegetables extract foliar application on storage quality of the grapes grape (Vitis vinifera L. cvs. ‘Perlette’ and ‘King’s Ruby’). The vines were sprayed after fruit set twice at 15 days interval at concentrations of 0, 0.20%, 0.30% and 0.40%. Fruit were harvested and kept under cold-storage at 0.5 ±0.5°C and 90% RH for 28 days. The physicochemical properties of treated and untreated berries were analyzed at 7 days intervals during the cold storage. The results showed that the pre-harvest application of vegetable extracts reduced the weight loss and inhibited the fruit decay. Treated grape also had higher ascorbic acid contents, total phenolics, 2,2-diphenyl-1-picrylhydrazyl-radical (DPPH) scavenging activity, and higher soluble solid contents, titratable acidity, and reduced sugar:acid ratio. The concentration of 0.30% and cultivar ‘Kings Ruby’ gave the best result as compared to untreated control. In conclusion, pre-harvest vegetables extract application on berries showed higher antioxidant activities in grape berries, and maintained their post-harvest quality. These results indicated that foliar spray of vegetables extract could effectively improve the fruit quality, mainly through the reduction of phenolic content.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2019, 18, 6; 107-117
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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