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    Wyświetlanie 1-13 z 13
    Tytuł:
    Evaluation of carbon stock in the sediment of two mangrove species, Avicennia marina and Rhizophora mucronata, growing in the Farasan Islands, Saudi Arabia
    Autorzy:
    Eid, E.M.
    Khedher, K.M.
    Ayed, H.
    Arshad, M.
    Moatamed, A.
    Mouldi, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2079280.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    carbon stock
    sediment
    Avicennia marina
    mangrove ecosystem
    Rhizophora mucronata
    arid region
    Saudi Arabia
    Opis:
    The aim of this study was to conduct the first comprehensive evaluation of carbon stock in the sediments of Avicennia marina (black mangrove) and Rhizophora mucronata (red mangrove) along the coastline of an arid region (Farasan Islands, Saudi Arabia). Such information is necessary for the development of any management plan for the mangrove ecosystems along the Saudi Red Sea islands and provide a rationale for the restoration of mangrove forests in Saudi Arabia. A. marina and R. mucronata locations showed significant (P < 0.001) differences in sediment bulk density (SBD) and sediment organic carbon (SOC) concentration with higher mean values for both in the sediments of A. marina. Considering the whole depth of sediment sampled (0–50 cm), the highest value of SOC stock (12.3 kg C m−2) was recorded at A. marina locations and the lowest (10.8 kg C m−2) at R. mucronata locations. Thus, the SOC stock of A. marina was greater than that of R. mucronata by 114.3%. Consequently, considering the rate of carbon sequestration and the area of mangrove forests (216.4 ha), the total carbon sequestration potential of mangroves in the Farasan Islands ranged between 10.3 Mg C yr−1 and 11.8 Mg C yr−1 for R. mucronata and A. marina locations, respectively. Thus, it is necessary to protect and restore these ecosystems for the sequestration of carbon and for their other valuable ecosystem services.
    Źródło:
    Oceanologia; 2020, 62, 2; 200-213
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the carbon sequestration capacity of arid mangroves along nutrient availability and salinity gradients along the Red Sea coastline of Saudi Arabia
    Autorzy:
    Shaltout, K.H.
    Ahmed, M.T.
    Alrumman, S.A.
    Ahmed, D.A.
    Eid, E.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/48145.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    carbon sequestration
    coastal wetland
    mangrove
    climate change
    nutrient availability
    salinity gradient
    Red Sea
    Saudi Arabia
    Źródło:
    Oceanologia; 2020, 62, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase Transitions in Magnetic and Superconducting Systems with Fluctuating Valence. Chemical Potential Evidence
    Autorzy:
    Gosławska, E.
    Matlak, M.
    Eid, Kh.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013336.pdf
    Data publikacji:
    2000-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Kz
    75.40.Cx
    Opis:
    We investigate the critical behaviour of the chemical potential and average occupation numbers using the extended s -f model with intersite Cooper pairing for systems with fluctuating valence. The model is able to describe phase transitions from normal ferromagnet to normal paramagnet at $T=T_{C}$, from superconducting paramagnet to normal paramagnet at $T=T_{S}$, as well as reentrant phase transitions with three critical temperatures $T_{S_{1}}, T_{C}$ and $T_{S_{2}} (T_{S_{1}} < T_{C} < T_{S_{2}})$. Present investigation, as well as recent results obtained for another models suggest one-to-one correspondence between critical temperatures of the system and kinks appearing in the temperature dependence of the chemical potential and average occupation numbers. This, in turn, indicates a possibility to apply the measurement of the chemical potential vs. temperature as an experimental universal tool when looking for phase transitions in solids.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 4; 713-718
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Decision Making in Crisis Management : Time Criticality Assessment
    Autorzy:
    Eid, M.
    Souza de Cursi, E.
    Abdelkhalak, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2068868.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
    Tematy:
    cascade
    domino
    effect
    model
    critical infrastructures protection
    CIP
    MS&A
    dynamic
    decision making
    time criticality
    Opis:
    The paper is proposing a methodology for assessing the time-criticality in the scope of a crisis resulting from a cascade of disruptions of a set of Critical Infrastructures (CIs). The success of the management of the crisis depends on taking the good decisions and undertaking the corresponding actions at the good timing. Identifying time intervals for decisions and actions requires dynamic models capable to assess the crisis time evolution. While, measuring the “criticality” of different time-intervals requires the use of suitable metrics. Based on previous works for modelling cascade of CIs’ disruptions incorporating CIs dependency and vulnerability, the authors propose a methodology to assess the time-criticality and propose the appropriate metrics. The methodology is based on the idea of comparing the time-profile of a given cascade of disruptions between two configurations: unstressed and stressed CIs. The CIs become stressed under the action of a threat and combined with the dependency between CIs. The unstressed configuration represents a risk-noise. Two metrics are proposed in order to carry on the comparison between the time-profiles of the stressed and the unstressed CIs. The proposed metrics are: the time to attend 90% of the asymptotic occurrence probability and the time to attend the most probable occurrence rate, describing the cascade likelihood. An academic case is presented in order to demonstrate the applicability of the methodology and illustrate some interesting features.
    Źródło:
    Journal of Polish Safety and Reliability Association; 2017, 8, 1; 13--22
    2084-5316
    Pojawia się w:
    Journal of Polish Safety and Reliability Association
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chemical Potential as a Detector of Phase Transitions in Solids
    Autorzy:
    Matlak, M.
    Gosławska, E.
    Grabiec, B.
    Eid, Kh.
    Powiązania:
    https://bibliotekanauki.pl/articles/2012963.pdf
    Data publikacji:
    2000-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.70.-b
    75.30.Kz
    75.40.Cx
    Opis:
    We show that the chemical potential exhibits small but distinct kinks at all critical temperatures as the evidence for phase transitions in the electronic system, structural phase transitions included. In the case of, at least, two kinds of interacting electrons average occupation numbers exhibit the same behavior.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 3; 365-368
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A topological model to assess networks connectivity and reliability
    Autorzy:
    Eid, M.
    Hami-EL, A.
    Souza de Cursi, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2069197.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
    Tematy:
    network
    connectivity
    failure
    reliability
    availability
    Opis:
    The acceleration of the interconnectivity of networks of all sorts brings to the front scene the issue of networks performance measure. Recently, one observed an accelerating course towards quantitative probabilistic models to describe and assess networks’ Connectivity, as being the main vector of performance. However, modelling realistic networks is still far from being satisfactorily achieved using quantitative probabilistic models. On the other hand, little room had been lift to exploring the potential of topological models to develop qualitative and semi- quantitative models in order to assess networks connectivity. In this paper, we are exploring the potential of the topological modelling. The proposed model is based on describing the nodepair connectivity using binary scalars of different orders (tensors). Preliminary results of our explorations sounded very promoting.
    Źródło:
    Journal of Polish Safety and Reliability Association; 2013, 4, 2; 167--178
    2084-5316
    Pojawia się w:
    Journal of Polish Safety and Reliability Association
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Approach to Design Broadband Air Backed Piezoelectric Sensor
    Autorzy:
    Ali, M. G. S.
    Elsayed, N. Z.
    Eid, E. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/176360.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    piezoelectric
    equivalent circuits
    impulse response
    frequency response
    matching layers
    z-transform
    Opis:
    In this work, an approach to the design of broadband thickness-mode piezoelectric transducer is presented. In this approach, simulation of discrete time model of the impulse response of matched and backed piezoelectric transducer is used to design high sensitivity, broad bandwidth, and short-duration impulse response transducers. The effect of matching the performance of transmitting and receiving air backed PZT-5A transducer working into water load is studied. The optimum acoustical characteristics of the quarter wavelength matching layers are determined by a compromise between sensitivity and pulse duration. The thickness of bonding layers is smaller than that of the quarter wavelength matching layers so that they do not change the resonance peak significantly. Our calculations show that the −3 dB air backed transducer bandwidth can be improved considerably by using quarter wavelength matching layers. The computer model developed in this work to predict the behavior of multilayer structures driven by a transient waveform agrees well with measured results. Furthermore, the advantage of this this model over other approaches is that the time signal for optimum set of matching layers can be predicted rapidly.
    Źródło:
    Archives of Acoustics; 2015, 40, 1; 3-10
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Simulation for Detecting Nonlinear Echoes from Microbubbles Packets
    Autorzy:
    Ali, M. G. S.
    Elsayed, N. Z.
    Eid, E. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/177697.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    microbubbles packets
    harmonic component
    acoustic
    radial dynamic
    pressure spectrum
    Opis:
    This work presents a simulation of the response of packets of microbubbles in an ultrasonic pulse-echo scan line. Rayleigh-Plesset equation has been used to predict the echo from numerically obtained radial dynamics of microbubbles. Varying the number of scattering microbubbles on the pulse wave form has been discussed. To improve microbubble-specific imaging at high frequencies, the subharmonic and second harmonic signals from individual microbubbles as well as microbubbles packets were simulated as a function of size and pressure. Two different modes of harmonic generation have been distinguished. The strength and bandwidth of the subharmonic component in the scattering spectrum of microbubbles is greater than that of the second harmonic. The pressure spectra provide quantitative and detailed information on the dynamic behaviour of ultrasound contrast agent microbubbles packet.
    Źródło:
    Archives of Acoustics; 2015, 40, 2; 151-157
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Critical infrastructure preparedness : cascading of disruptions considering vulnerability and Dependency
    Autorzy:
    Eid, M.
    Hakkarainen, T.
    Terhi, K.
    Souza-Cursi-de, E.
    El-Hami, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2069144.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
    Tematy:
    CIP
    cascade
    disruption
    vulnerability
    dependency
    model
    simulation
    stochastic
    Poisson
    probability
    Opis:
    Critical Infrastructures’ disruptions may result in crises of unacceptable outcomes in modern societies. Thus, it is important to develop models that allow describing CIs’ disruptions and their propagation characteristics. CI disruptions depend on both the type of the threat and on the nature of the CIs’ mutual dependencies. A model describing the cascade of disruptions should, then, be able to consider the CI-threat vulnerability and the CI-CI dependency. The paper presents a model where cascades are exactly described using an integral equation. The integral equation admits an analytical solution if the occurrence probability distribution functions (pdf) of the disruptions obey Stochastic Poisson Processes (SPP). The introduction of the “vulnerability to the threat” and the “CIs’ (inter)dependencies” is carried out with the help of time constant factors called: “vulnerability strain factor” and “disruption strain factor”, respectively. An academic case is presented in order to demonstrate the applicability of the model and illustrate some interesting features of the model. A complete set of numerical applications will be published separately.
    Źródło:
    Journal of Polish Safety and Reliability Association; 2016, 7, 1; 61--66
    2084-5316
    Pojawia się w:
    Journal of Polish Safety and Reliability Association
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A resilience model based on Stochastic Poison Process
    Autorzy:
    Eid, M.
    Serafin, D.
    Barbarin, Y.
    Kołowrocki, K.
    Kuligowska, E.
    Soszyńska-Budny, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2069310.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
    Tematy:
    critical infrastructure
    resilience
    protection
    modelling
    simulation
    Opis:
    Critical Infrastructure (CI) Preparedness and Resilience modelling, simulation & analysis (MS&A) is a major issue in CI protection (CIP) and crisis management. This is due to the rapid growth of the inference of the smart complex systems in the modern society activities. The concept of resilience in CIP is not yet clearly defined. However, “resilience” is often used as a measure of the system good behaviour facing a given threat. Under a given threat, a CI may evolve within a set of well-defined operating phases. Subsequently, the failure of the CI to provide the expected service will depend not only on the threat nature but also on the operating phase. A tentative probabilistic model is proposed describing the robustness and the resilience of a well-defined infrastructure facing a given threat.
    Źródło:
    Journal of Polish Safety and Reliability Association; 2015, 6, 3; 45--52
    2084-5316
    Pojawia się w:
    Journal of Polish Safety and Reliability Association
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Critical Infrastructures Protection (CIP) : coupled modelling for threats and resilience
    Autorzy:
    Eid, M.
    El-Hami, A.
    Souza de Cursi, E.
    Kołowrocki, K.
    Kuligowska, E.
    Soszyńska-Budny, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2069190.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
    Tematy:
    Critical Infrastructures Protection
    CIP
    resilience
    robustness
    failure
    dynamic
    model
    crisis
    management
    Opis:
    Critical Infrastructure Protection (CIP) requires the development of models and tools able to describe and simulate the threats’ and the Critical Infrastructure’s (CI) dynamic behaviour. However, these modelling activities are very often carried out separately for threats and for CI behaviour. An effective assessment of the CI’s resilience and preparedness requires real coupled models of threats dynamic and CI’s one. The authors develop some basic ideas about coupled modelling in the sense of coupling the dynamics of the threat with that of the CIs, within a stochastic modelling approach. Such coupled dynamic models would enhance the effectiveness of our capabilities to assess CI’s resilience and to help in decision making for crisis management.
    Źródło:
    Journal of Polish Safety and Reliability Association; 2015, 6, 1; 85--94
    2084-5316
    Pojawia się w:
    Journal of Polish Safety and Reliability Association
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bacterial biofilm and its relation to cervical adenopathy, tonsillar hypertrophy and adenoid hypertrophy in chronic tonsillitis
    Autorzy:
    Eid, Mustafa I
    Elabd, Safia H
    Erfan, Dina M
    Ziada, Kholood W
    Ezzat, Abdelrahman E. M
    Powiązania:
    https://bibliotekanauki.pl/articles/1401686.pdf
    Data publikacji:
    2016
    Wydawca:
    Index Copernicus International
    Tematy:
    bacterial biofilm
    chronic tonsillitis
    antibiotic resistance
    Opis:
    Background: Bacterial biofilms have been linked to recurrent adenotonsillar diseases, with special concern regarding therapeutic management hindered by antibiotic resistance. Aims: we aimed to find if there was a relationship between the presence of a bacterial biofilm and the development of cervical lymphadenopthy, tonsillar hypertrophy and adenoid hypertrophy in patients with chronic tonsillitis. Patients and Methods: Tissue samples from tonsillar biopsies of 30 children who underwent tonsillectomy were examined by scanning electron microscopy (SEM). Settings and Design: This cross-sectional study was conducted between August 2012 and July 2015 in Al-Azhar University Hospitals. Results: It was found that 23.3% of children had a fully formed bacterial biofilm (Grade III), 6.7% had grade I and 6.7% had grade II biofilms as demonstrated by SEM. Staphylococcus aureus was the most common identified isolate (26%) followed by Coagulase-negative Staphylococci (17.4%) and Klebsiella pneumoniae (10.4%). No statistically significant difference regarding the presence of a bacterial biofilm and the development of cervical lymphadenopthy, tonsillar hypertrophy or adenoid hypertrophy was found. Conclusion: Bacterial biofilm is a possible cause of the chronicity of tonsillar diseases in children. There is no relationship between the presence of a bacterial biofilm and the development of of cervical lymphadenopthy, tonsillar hypertrophy or adenoid hypertrophy.
    Źródło:
    Polski Przegląd Otorynolaryngologiczny; 2016, 5, 3; 28-32
    2084-5308
    2300-7338
    Pojawia się w:
    Polski Przegląd Otorynolaryngologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biofim bakteryjny i jego związek z adenopatią szyjną, przerostem migdałków podniebiennych i/lub przerostem migdałka gardłowego w przewlekłym zapaleniu migdałków podniebiennych
    Autorzy:
    Eid, Mustafa I
    Elabd, Safia H
    Erfan, Dina M
    Ziada, Kholood W
    Ezzat, Abdelrahman E. M
    Powiązania:
    https://bibliotekanauki.pl/articles/1401741.pdf
    Data publikacji:
    2016
    Wydawca:
    Index Copernicus International
    Tematy:
    biofilm bakteryjny
    przewlekłe zapalenie migdałków podniebiennych
    oporność na antybiotyki
    Opis:
    Wstęp: Wykazano związek biofilmu bakteryjnego z nawracającymi chorobami migdałków podniebiennych oraz migdałka gardłowego, wykazującymi oporność na antybiotyki oraz związanymi z szczególnymi trudnościami w zakresie postępowania terapeutycznego. Cele: Starano się wykazać związek pomiędzy obecnością biofilmu bakteryjnego a występowaniem limfadenopatii szyjnej, przerostem migdałków podniebiennych oraz przerostem migdałka gardłowego w przypadkach przewlekłego zapalenia migdałków podniebiennych. Materiał i metody: Materiał tkankowy z badania biopsyjnego migdałków podniebiennych, pochodzący od 30 dzieci poddanych tonsillektomii, badany skaningowym mikroskopem elektronowym (SEM, ang. scanning electron microscope). Projekt badania: Badanie przekrojowe zostało przeprowadzone od sierpnia 2012 do lipca 2015 roku w Szpitalu Uniwersyteckim Al-Azhar (Al-Azhar University Hospitals). Wyniki: Stwierdzono, że u 23,3% dzieci występował w pełni wykształcony biofilm bakteryjny (III stopień), u 6,7% występował biofilm I stopnia, u 6,7% – II stopnia, co wykazano w badaniu SEM. Najczęściej izolowanym szczepem był Staphylococcus aureus (26%), następnie gronkowce koagulazo-ujemne (17,4%) i Klebsiella pneumoniae (10,4%). Nie wykazano statystycznie istotnej różnicy w odniesieniu do obecności biofilmu bakteryjnego w zależności od występowania lub braku limfadenopatii szyjnej, przerostu migdałków podniebiennych lub przerostu migdałka gardłowego. Wnioski: Biofilm bakteryjny jest możliwą przyczyną przewlekłości choroby migdałków u dzieci. Nie wykazano związku pomiędzy jego obecnością a występowaniem limfadenopatii szyjnej, przerostem migdałków podniebiennych lub przerostem migdałka gardłowego.
    Źródło:
    Polski Przegląd Otorynolaryngologiczny; 2016, 5, 3; 28-32
    2084-5308
    2300-7338
    Pojawia się w:
    Polski Przegląd Otorynolaryngologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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