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Wyświetlanie 1-15 z 26
Tytuł:
Estimation of radiation doses for transition from emergency to existing exposure situation
Autorzy:
Hamed, A. A.
Salem, E. F.
Abdien, A. K.
Powiązania:
https://bibliotekanauki.pl/articles/146583.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
nuclear emergency
emergency computer code
severe accident
Opis:
The transition from emergency to existing exposure situation is an important stage in the nuclear or radiological emergency plan. It requires arrangements to be put in place and to be implemented so as to ensure that the transition is made in a coordinated and orderly manner of guidelines for adjusting the undertaken protective actions and other response actions. The delivering radiation doses to public and environmental pollution are monitoring that measurements should be implemented according to certain plan of intervention and protective actions in the different stages of the N/R accident. In this study, a computer model (RASCAL) is used to calculate the effect of severe accident could have detected on an operating nuclear power reactor PWR and the possible impact on the public. Features for the decision to implement the transition from emergency to existing exposure situation are proposed depending on the estimation of the collection of deliver exposure doses to the public and environment due to monitoring the different radiation sources resulting from the N/R accident.
Źródło:
Nukleonika; 2015, 60, No. 4, part 2; 943-950
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of the proanthocyanidin fraction from Medemia argun on the in vitro growth and activity of selected soil microorganisms
Autorzy:
Martyniuk, S.
Hamed, A. I.
Gębala, B.
Stochmal, A.
Powiązania:
https://bibliotekanauki.pl/articles/960253.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Opis:
Many substances of plant origin, e.g. alkyloresorcinols, benzoxazinoids, essential oils, isothiocyanates or saponins, have been tested as potential antimicrobial agents to control various pathogenic microorganisms. Medemia agrun is a mysterious, not well-known species of the fan palm from the Nubian Desert Oases of Southern Egypt and Northern Sudan. Nuts of M. argun have been found to be rich (about 5%) in proanthocyanidins, consisting of afzelechin, catechin and gallocatechin as the main subunits of these polyphenolic compounds. The aim of this work was to assess effects of the proanthocyanidin (PAC) fraction obtained from M. agrun nuts on the in vitro growth and activity of two soil-borne fungal pathogens of cereals (Gaeumannomyces graminis var. tritici and Cephalosporium gramineum) and a beneficial soil bacterium, Azotobacter chroococcum, known to fix atmospheric nitrogen. The fungi were grown on PDA medium and A. chroococcum was cultured on Burk’s N-free medium supplemented with different concentrations of the PAC fraction. This fraction applied at the highest concentration tested (200 μg cm-3) did not affect the mycelial growth of the fungus Cephalosporium gramineum on PDA medium but significantly reduced (by 20%) that of Gaeumannomyces graminis var. tritici. Proliferation and N2-fixation by Azotobacter chroococcum in N-free liquid medium containing 500 μg cm-3 of the PAC fraction were more intensive than those in the medium with an equivalent concentration of glucose. It has been shown for the first time that this bacterium can use the PAC fraction as the only source of C and energy for N2-fixation.
Źródło:
Journal of Elementology; 2017, 22, 1
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Examining the Interrelation Between Job Autonomy and Job Performance: A Critical Literature Review
Autorzy:
Khoshnaw, Saifaddin
Alavi, Hamed
Powiązania:
https://bibliotekanauki.pl/articles/2064920.pdf
Data publikacji:
2020
Wydawca:
STE GROUP
Tematy:
employee performance
culture
job performance
Opis:
This paper aims at examining the role of job autonomy in organizations and its relation with employee performance. This will be achieved by providing a critical review of the subject matter in existing management literature. In recent years, the concept of job autonomy has gained an increasing importance in practice of Human Resource Management. Even some studies claimed that job autonomy directly affects job performance and some of its indicators including job satisfaction, motivation, job engagement and job commitment. As a result, current paper aims at studying the effect of job autonomy on employee performance by critically reviewing existing work of human resource scholars. Main research questions approached by authors include: Is there any meaningful relationship between job autonomy and employee’s job performance distinguished in existing literature? If yes, what impact can be expected from job autonomy on employee’s job performance?
Źródło:
Multidisciplinary Aspects of Production Engineering; 2020, 3, 1; 606--616
2545-2827
Pojawia się w:
Multidisciplinary Aspects of Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
PCR-based detection of Helicobacter pylori and non-Helicobacter pylori species among humans and animals with potential for zoonotic infections
Autorzy:
Youssef, A.I.
Afifi, A.
Abbadi, S.
Hamed, A.
Enany, M.
Powiązania:
https://bibliotekanauki.pl/articles/2087111.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Helicobacter spp.
zoonotic infections
detection
identification
Źródło:
Polish Journal of Veterinary Sciences; 2021, 24, 3; 445-450
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Neuro-fuzzy modelling of blending process in cement plant
Autorzy:
Araromi, D O
Odewale, S A
Hamed, J O
Powiązania:
https://bibliotekanauki.pl/articles/102547.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
neuro-fuzzy
blending
carbonate content
raw mix
Opis:
The profitability of a cement plant depends largely on the efficient operation of the blending stage, therefore, there is a need to control the process at the blending stage in order to maintain the chemical composition of the raw mix near or at the desired value with minimum variance despite variation in the raw material composition. In this work, neuro-fuzzy model is developed for a dynamic behaviour of the system to predict the total carbonate content in the raw mix at different clay feed rates. The data used for parameter estimation and model validation was obtained from one of the cement plants in Nigeria. The data was pre-processed to remove outliers and filtered using smoothening technique in order to reveal its dynamic nature. Autoregressive exogenous (ARX) model was developed for comparison purpose. ARX model gave high root mean square error (RMSE) of 5.408 and 4.0199 for training and validation respectively. Poor fit resulting from ARX model is an indication of nonlinear nature of the process. However, both visual and statistical analyses on neuro-fuzzy (ANFIS) model gave a far better result. RMSE of training and validation are 0.28167 and 0.7436 respectively, and the sum of square error (SSE) and R-square are 39.6692 and 0.9969 respectively. All these are an indication of good performance of ANFIS model. This model can be used for control design of the process.
Źródło:
Advances in Science and Technology. Research Journal; 2015, 9, 28; 27-33
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some features of salt-architecture in the medieval Sudanic cities: Taghaza in Mali as a model
Autorzy:
Ali, Ismail Hamed Ismail
Powiązania:
https://bibliotekanauki.pl/articles/18866582.pdf
Data publikacji:
2023-06-30
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
Salt-Architecture
West Africa
Taghaza
salinas
Sahara
Opis:
The Salt played a vital role in the life of west African societies, including the land of Sudan, from the dawn of their early history. In some cases, it was even more valuable than gold because of the lack of salt in most Sudanic kingdoms, such as Ghana, Mali & Songhai. The most famous of these Salinas was known as Taghaza, in addition to Ulil & Tatantatal, etc. They were related to what is called salt-architecture. We took Taghaza as an example of this rare architecture. West Africans used salt to preserve food, for healing and even for building houses, mosques and city walls. As the city of Taghaza, currently located in Mali, is in the most famous salt region, it is considered to be the best model of a salty city in west Africa. Salt contributed to the Sahara trade, known as the trade of salt and gold. Salt was indispensable for most inhabitants of West Africa. They lived near e salt quarries and used it mainly to build their houses and any other constructions they need.
Źródło:
African Journal of Economics, Politics and Social Studies; 2023, 2(1); 69-77
2956-2686
Pojawia się w:
African Journal of Economics, Politics and Social Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hybrid PAPR reduction schemes for different OFDM-based VLC systems
Autorzy:
El-Ganiny, Mohamed Y.
Khalaf, Ashraf A. M.
Hussein, Aziza I.
Hamed, Hesham F. A.
Powiązania:
https://bibliotekanauki.pl/articles/2174839.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
visible light communication
peak-to-average power ratio
bit error rate
Opis:
Orthogonal frequency division multiplexing has been widely used in many radio frequency wireless communication standards as a preferable multicarrier modulation scheme. The modulated signals of a conventional orthogonal frequency division multiplexing system are complex and bipolar. In intensity-modulated direct detection optical wireless communications, transmitted signals should be real and unipolar due to non-coherent emissions of an optical light emitting diode. In this paper, different hybrid optical systems have been proposed to satisfy real and unipolar signals. Peak-to-average power ratio is one of the biggest challenges for orthogonal frequency division multiplexing-based visible light communications. They are based on a combination of non-linear companding techniques with spreading or precoding techniques. Simulation evaluation is performed under direct current-biased optical orthogonal frequency division multiplexing, asymmetrically clipped optical orthogonal frequency division multiplexing, and Flip-orthogonal frequency division multiplexing systems in terms of peak-to-average power ratio, bit error rate, and spectral efficiency. The proposed schemes are investigated to determine a scheme with a low peak-to-average power ratio and an acceptable bit error rate. MATLABTM software has been successfully used to show the validity of the proposed schemes.
Źródło:
Opto-Electronics Review; 2022, 30, 3; art. no. e141951
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hybrid PAPR reduction schemes for different OFDM-based VLC systems
Autorzy:
El-Ganiny, Mohamed Y.
Khalaf, Ashraf A. M.
Hussein, Aziza I.
Hamed, Hesham F. A.
Powiązania:
https://bibliotekanauki.pl/articles/2174840.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
visible light communication
peak-to-average power ratio
bit error rate
Opis:
Orthogonal frequency division multiplexing has been widely used in many radio frequency wireless communication standards as a preferable multicarrier modulation scheme. The modulated signals of a conventional orthogonal frequency division multiplexing system are complex and bipolar. In intensity-modulated direct detection optical wireless communications, transmitted signals should be real and unipolar due to non-coherent emissions of an optical light emitting diode. In this paper, different hybrid optical systems have been proposed to satisfy real and unipolar signals. Peak-to-average power ratio is one of the biggest challenges for orthogonal frequency division multiplexing-based visible light communications. They are based on a combination of non-linear companding techniques with spreading or precoding techniques. Simulation evaluation is performed under direct current-biased optical orthogonal frequency division multiplexing, asymmetrically clipped optical orthogonal frequency division multiplexing, and Flip-orthogonal frequency division multiplexing systems in terms of peak-to-average power ratio, bit error rate, and spectral efficiency. The proposed schemes are investigated to determine a scheme with a low peak-to-average power ratio and an acceptable bit error rate. MATLABTM software has been successfully used to show the validity of the proposed schemes.
Źródło:
Opto-Electronics Review; 2022, 30, 3; art. no. e141951
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Risk Analysis in Construction Phase of Oil and Gas Projects: A Critical Literature Review
Autorzy:
Alavi, Hamed
Nadir, Soma Latif
Powiązania:
https://bibliotekanauki.pl/articles/2064865.pdf
Data publikacji:
2020
Wydawca:
STE GROUP
Tematy:
project management
construction projects
risk management
oil and gas industry
Opis:
The construction phase of oil and gas projects (OGPs) is a risky process and project managers face numerous challenges during this particular period. A proper risk analysis and management during the construction phase of the OGPs not only will affect the timely and successful operation of the project as a whole, it can also affect occurrence of risks in subsequent phases and overall economic viability of the project. As a result, via using extensive literature review, this study tries to answer the question of what are main risks involved in construction phase of OGPs and which methods are used for identifying them? The outcome of this research would likely be a valuable source for construction professionals to improve project performance while managing existing risks. It is also useful to avoid common problems that befall many project managers and will assist them to have a better understanding of risk management as part of a project plan.
Źródło:
Multidisciplinary Aspects of Production Engineering; 2020, 3, 1; 668--680
2545-2827
Pojawia się w:
Multidisciplinary Aspects of Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A proposed preamble channel estimation scheme for flip FBMC-based indoor VLC systems
Autorzy:
El-Ganiny, Mohamed Y.
Khalaf, Ashraf A. M.
Hussein, Aziza I.
Hamed, Hesham F. A.
Powiązania:
https://bibliotekanauki.pl/articles/2063904.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
channel estimation
filter bank multicarrier
IEEE 802.15.7 standard
interference approximation method
visible light communication
Opis:
Filter bank multicarrier waveform is investigated as a potential waveform for visible light communication broadcasting systems. Imaginary inter-carrier and/or inter-symbol interference are causing substantial performance degradation in the filter bank multicarrier system. Direct current-biased optical filter bank multicarrier modulation overcomes all the problems of direct current-biased optical-orthogonal frequency division multiplexing modulation approaches in terms of speed and bandwidth. However, it also wastes a lot of energy while transforming a true bipolar signal into a positive unipolar signal by adding direct current-bias. In this paper, a flip-filter bank multicarrier-based visible light communication system was introduced to overcome this problem. In this system, a bipolar signal is converted to a unipolar signal by isolating the positive and negative parts, turning them to positive and then delivering the signal. Also, a new channel estimation scheme for a flip-filter bank multicarrier system is proposed which improves the channel estimation performance compared to that of each of the conventional schemes. The proposed system performance is measured in terms of bit error rate, normalized mean squared error, and constellation diagram. The superiority of the proposed scheme over other conventional structures has been successfully verified by MATLAB 2020b simulation experiments results. These results are evaluated under indoor visible light communication standard.
Źródło:
Opto-Electronics Review; 2022, 30, 1; art. no. e140859
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface Effect on Electronic, Magnetic and Optical Properties of PtCoBi Half-Heusler: A DFT Study
Autorzy:
Rezazadeh, Hamed
Hantehzadeh, Mohamadreza
Boochani, Arash
Powiązania:
https://bibliotekanauki.pl/articles/2048803.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
PtCoBi
[001] film
DFT
electronic property
optical property
Opis:
The electronic, magnetic, and optical properties of PtCoBi half-Heusler compound [001] surfaces and its bulk state have been investigated in the framework of density functional theory using GGA approximation. The half-metallic behaviors of CoBiterm, CoPt-term and PtBi-term decrease with respect to its bulk state. The spin polarization at the Fermi level is 73.2% for the bulk state, and it is -64.4% and -64.1% for the CoBi-term and PtBi-term, respectively while less polarization has been observed for the CoPt-term. All terminations have given almost similar optical responses to light. Plasmon oscillations for the terminations occur in the range of 12.5 to 14.5 eV (21 to 22 eV) along xx (zz), and it occurs at 23 eV for the bulk state. The refractive index for the bulk and all three terminations is very high in the infrared and visible areas, meaning a very strong metallic trend in these compounds. The phenomenon of super-luminance occurs for the incident light with energy exceeding 5.5 eV for all three terminations, and it occurs in the range of 10 eV for the bulk mode. These terminations show transparent behavior after the energy of 10 eV.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 1; 155-166
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparative assessment of meteorological drought in the Tafna basin, Northwestern Algeria
Autorzy:
Bougara, Hanane
Baba-Hamed, Kamila
Borgemeister, Christian
Tischbein, Bernhard
Kumar, Navneet
Powiązania:
https://bibliotekanauki.pl/articles/2048629.pdf
Data publikacji:
2021
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
drought
meteorological drought indices
Tafna basin
trend analysis
Opis:
The drought ranked first in terms the natural hazard characteristics and impacts followed by tropical cyclones, regional floods, earthquakes, and volcanoes. Drought monitoring is an important aspect of drought risk management and the assessment of drought is usually done through using various drought indices. The western region in Algeria is the most affected by the drought since the middle of the 70s.The current research focuses on the analysis and comparison of four meteorological drought indices (standardized precipitation index – SPI, percent of normal index – PN, decile index – DI, and rainfall anomaly index – RAI) in the Tafna basin for different time scales (annual, seasonal, and monthly) during 1979–2011. The results showed that the SPI and DI have similar frequencies for dry and wet categories. The RAI and PN were able to detect more drought categories. Meanwhile, all indices have strong positive correlations between each other, especially with Spearman correlation tests (0.99; 1.0), the meteorological drought indices almost showed consistent and similar results in the study area. It was determined in 1982 as the driest year and 2008 as the wettest year in the period of the study. The analysis of the trend was based on the test of Mann–Kendall (MK), a positive trend of the indices were detected on a monthly scale, this increasing of indices trend represent the increasing of the wet categories which explains the increasing trend of the rainfall in the last 2000s. These results overview of the understanding of drought trends in the region is crucial for making strategies and assist in decision making for water resources management and reducing vulnerability to drought.
Źródło:
Journal of Water and Land Development; 2021, 51; 78-93
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A note on the functional law of the iterated logarithm for Lévys area process
Autorzy:
N’zi, Modeste
Eddahbi, M’hamed
Powiązania:
https://bibliotekanauki.pl/articles/1339281.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
law of the iterated logarithm
Lévy's area process
Brownian motion
maximum likelihood
Opis:
By using large deviation techniques, we prove a Strassen type law of the iterated logarithm, in Hölder norm, for Lévy's area process.
Źródło:
Applicationes Mathematicae; 1996-1997, 24, 2; 223-229
1233-7234
Pojawia się w:
Applicationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study of challenges in entrepreneurship development and potential role of public sector in mitigating them – evidence from Kurdistan region of Iraq
Autorzy:
Alavi, Hamed
Ghafour, Shano Ibrahim
Powiązania:
https://bibliotekanauki.pl/articles/2064722.pdf
Data publikacji:
2019
Wydawca:
STE GROUP
Tematy:
entrepreneurship
economy
entrepreneurship ecosystem
market
finance
Opis:
The purpose of this paper is to identify the main challenges faced by entrepreneurs in the Kurdistan region of Iraq and possible ways that regional public sector can take for the purpose of improving entrepreneurship development. Given the importance of entrepreneurs in the economic development and job creation, it’s critical to understand what drives entrepreneurs to become less effective and to investigate how the implementation of “entrepreneurship ecosystem” practiced by public policy makers mitigates these challenges. As a result, authors strive to answers two main questions in this paper: “What are the factors that hold back entrepreneurs in the Kurdistan Region to start their own businesses? “And “What measures the local government can take to mitigate such challenges?” The methodology used in this study is quantitative approach, involving a survey questionnaire. This paper consists of four parts: After the introduction, second part will provide empirical data on challenges facing entrepreneurs in Kurdistan Region of Iraq. Discussion and analysis of the findings are done in the third part. Finally, in the last part, paper will offer conclusions by summarizing the key findings.
Źródło:
Multidisciplinary Aspects of Production Engineering; 2019, 2, 1; 589--599
2545-2827
Pojawia się w:
Multidisciplinary Aspects of Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Security Criteria for IoT-Based Supply Chain: A Case Study of FMCG Industries
Autorzy:
Nozari, Hamed
Fallah, Mohammad
Szmelter-Jarosz, Agnieszka
Krzemiński, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/1934124.pdf
Data publikacji:
2021
Wydawca:
Akademia Leona Koźmińskiego w Warszawie
Tematy:
Internet of Things
Fuzzy AHP
MCDM
supply chain management
FMCG
Opis:
Purpose: In supply chains, creating a secure space for data production, sending, storing, and analysis has always been a critical issue. The main goal of this research was to evaluate the importance of various security criteria in an intelligent supply chain system. Methodology: The main data collection method was the expert survey. Experts validated the security criteria and sub-criteria. Then, the importance of these criteria was evaluated using the fuzzy analytic hierarchy process method. Findings: The results revealed that reliability and privacy with their sub-criteria were the most important ones among the obtained security criteria for IoT-based supply chain management. Practical implications: The research results can provide valuable insight for supply chains’ decision-makers. The findings can also be a good reference point for researchers who work on the IoT-based supply chain concept in other countries and sectors. Research limitations: Limitations of this study are the purposive sampling method and the limited scope of studied companies and sectors. Therefore, the article provides initial insight on the matter. Originality: The study presents the research problem from a new perspective and gives possible solutions for IoT-based supply chain management.
Źródło:
Central European Management Journal; 2021, 29(4); 149-171
2658-0845
2658-2430
Pojawia się w:
Central European Management Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
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