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Wyszukujesz frazę "Hammad, A." wg kryterium: Autor


Wyświetlanie 1-5 z 5
Tytuł:
Structure and Some Physical Properties of Chemically Deposited Nickel Sulfide Thin Films
Autorzy:
Hammad, A.
ElMandouh, Z.
Elmeleegi, H.
Powiązania:
https://bibliotekanauki.pl/articles/1400567.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.cp
68.37.Hk
68.55.jd
68.55.J-
78.20.Ci
78.68.+m
73.50.Lw
73.90.+f
Opis:
$Ni_2S_{2-x}$ thin films with x=0, 0.5, and 1 were prepared by chemical bath deposition technique. Amorphous structure was discovered by XRD for x=1, while α-Ni₇S₆ and NiS phases were discovered for x=0, and x=0.5 respectively. SEM graphs of the studied films have confirmed the XRD results. Optical band gap values increase from 0.845 to 0.912 eV, with increase of the composition x from 0 to 1. Activation energy values increase in the range from x=0 to x=0.5 and does not change for x=1.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 901-903
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
FTIR Study of Nanostructure Perovskite $BaTiO_3$ Doped with Both $Fe^{3+}$ and $Ni^{2+}$ Ions Prepared by Sol-Gel Technique
Autorzy:
Abdel Aal, A.
Hammad, T.
Zawrah, M.
Battisha, I.
Abou Hammad, A.
Powiązania:
https://bibliotekanauki.pl/articles/1377829.pdf
Data publikacji:
2014-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Fw
81.07.Bc
64.70.kg
61.05.C-
78.30.Ly
81.10.Aj
Opis:
Pure barium titanate $BaTiO_3 (BT)$ and BT doped with two different transition elements $Fe^{3+}$ and $Ni^{2+}$ at 5 mol.% (BT5Fe and BT5Ni, respectively) as constant concentration in powder form have been prepared by sol-gel method using barium acetate, titanium(IV) n-butoxide, iron and nickel nitrates as precursor materials. The microstructure of BT and the influence of Fe and Ni dopants on it were investigated by X-ray diffraction and Fourier transform infrared spectroscopy. X-ray diffraction shows that tetragonal phase is dominant for pure BT sintered for 4 h at 800°C. Scanning electron microscopy and transmission electron microscopy were used to study surface morphology and particle size distribution for BT5Fe and BT5Ni, respectively. The presence of hydroxyl defects were verified by Fourier transform infrared spectroscopy for $(BaTi_{1-x}Fe_{x}O_{3-x/2}) (BT_xFe)$, where x=0.005, 0.01, 0.05, and 0.07 and $(BaTi_{1-x}Ni_{x}O_{3-x/2}) (BT_xNi)$, where x=0.005, 0.01, 0.03, 0.05, and 0.07.
Źródło:
Acta Physica Polonica A; 2014, 126, 6; 1318-1321
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Genetic variability and host specialization in Alternaria alternata colonizing Solanaceous crops in Sudan
Autorzy:
Abbo, A.S.
Idris, M.O.
Elballa, M.A.
Hammad, A.M.
El Sidding, M.A.R.
Karlovsky, P.
Powiązania:
https://bibliotekanauki.pl/articles/66044.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
plant disease
early blight
genetic variability
host
Alternaria alternata
diversity
Solanaceae
crop
amplified fragment length polymorphism
Sudan
Opis:
Early blight disease caused by Alternaria sp. is one of the most devastating diseases of Solanaceous crops widely distributed in Sudan. The aim of this study was to determine the genetic variation among different Alternaria isolates recovered from different Solanaceae crops showing typical symptoms of early blight disease. Infected leaves of tomato, potato, eggplant and pepper were collected from different geographical zones in Sudan. The recovered fungal isolates were identified to the genus level based on cultural and morphological characteristics. Five representative isolates were sent to the CABI Bioscience, U.K. for confirmation. The genetic relationship among the isolates was determined using the amplified fragments length polymorphism (AFLP) technique and the generated data were used to create similarity matrices using the PAST 3.01 software package. Dendrograms were constructed based on Jaccard’s similarity coefficients. A total of 70 fungal isolates was recovered from the tested plants and all of them showed morphological characteristics typical of Alternaria spp. The conidia appeared in multiple-branched chains with spore sizes in the range of 2.38−13.09 μm × 12.30−43.63 μm. Therefore, the isolates were identified as Alternaria alternata (Fr.) Keissl. The identification was then confirmed by CABI.AFLPbased dendrogram which revealed five clusters with a significant cophenetic correlation coefficient (r = 0.834) between the dendrogram and the original similarity matrix irrespective of their geographical origins. Eighteen (75%) of the Alternaria isolated from tomato leaves were clustered together in cluster I and five isolates formed two separate clusters, viz. cluster IV (T-Kh5 and T-H1) and cluster V (T-H4 and T-Med2). The remaining isolate, T-Am5, grouped with one of the potato isolates in cluster III. The other isolates which were recovered from potato, pepper and eggplants were all separated from the tomato isolates in the largest cluster.
Źródło:
Journal of Plant Protection Research; 2018, 58, 3
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Understanding the relationship between supply chain risk and lean operations performance
Zrozumienie związku między ryzykiem łańcucha dostaw a skutecznością operacji lean
Autorzy:
Alsmairat, Mohammad A. K.
Mushtaha, Alaa S.
Hammad, Mona S.A.
Powiązania:
https://bibliotekanauki.pl/articles/27315102.pdf
Data publikacji:
2023
Wydawca:
Politechnika Częstochowska
Tematy:
supply chain risks
lean operations
performance
supply chain resilience
ryzyka łańcucha dostaw
operacje lean
skuteczność
odporność łańcucha dostaw
Opis:
The main purpose of this study is to examine the effect of supply chain (SC) risk on lean operation performance (LOP) along with the role of supply chain resilience (SCR) as a mediator in this relationship among manufacturing companies. A quantitative approach was employed to investigate how supplier, demand, and transportation risks impact lean operations performance through the mediation of SCR. This study involved conducting an online survey of 255 manufacturing companies in the Middle East. The researchers used a hypothesis-testing deductive approach to test their conceptual model, and the results were analyzed using Smart PLS software. These findings indicate that supplier, demand, and transportation risks significantly affect SCR. Moreover, a direct path effect was found between SC risk and lean operational performance. This study emphasizes the relationship between SCR and its mediating effect on SC risk mitigation and lean operations performance. Through empirical evidence, this study demonstrated that SCR is a crucial characteristic of logistics that can aid in mediating the association between SC risk mitigation and lean operational performance. It provides valuable insights for managers, policymakers, and stakeholders regarding the significance of implementing these three enablers to enhance lean operational performance in manufacturing firms. This study presents a unique perspective on the mediating role of SC resilience in the Middle East, which has not been extensively studied in the literature. The findings could provide insights for practitioners in the region to enhance their SC risk management and lean operation performance.
Głównym celem niniejszego opracowania jest zbadanie wpływu ryzyka związanego z łańcuchem dostaw (Supply Chain - SC) na skuteczność operacji lean (Lean Operation Performance - LOP) wraz z rolą odporności łańcucha dostaw (Supply Chain Resilience - SCR) jako pośrednika w tej relacji między firmami produkcyjnymi. Zastosowano metodę ilościową w celu zbadania, w jaki sposób ryzyko związane z dostawcami, popytem i transportem wpływa na skuteczność operacji lean poprzez pośrednictwo SCR. Badanie obejmowało przeprowadzenie ankiety internetowej wśród 255 firm produkcyjnych na Bliskim Wschodzie. Badacze wykorzystali dedukcyjną metodę testowania hipotez do sprawdzenia swojego modelu koncepcyjnego, a wyniki przeanalizowano za pomocą oprogramowania Smart PLS. Wyniki wskazują, że ryzyko związane z dostawcami, popytem i transportem znacząco wpływa na SCR. Ponadto stwierdzono bezpośredni efekt ścieżki między ryzykiem SC a skutecznością operacyjną lean. Badanie to podkreśla związek między SCR i jego pośredniczącym wpływem na ograniczanie ryzyka SC i LOP. Dzięki dowodom empirycznym badanie to wykazało, że SCR jest kluczową cechą logistyki, która może pomóc w pośredniczeniu w powiązaniu między ograniczaniem ryzyka SC a skutecznością operacji lean. Dostarczają one cennych informacji dla menedżerów, osób odpowiedzialnych za wyznaczanie kierunków polityki i innych interesariuszy na temat znaczenia wdrożenia tych trzech czynników w celu zwiększenia skuteczności operacyjnej lean w firmach produkcyjnych. Badanie to przedstawia unikalną perspektywę pośredniczącej roli odporności SC na Bliskim Wschodzie, która nie była szeroko badana w literaturze. Wyniki badania mogą zapewnić praktykom w regionie wgląd w poprawę zarządzania ryzykiem SC i skuteczności operacji lean.
Źródło:
Polish Journal of Management Studies; 2023, 27, 1; 7--25
2081-7452
Pojawia się w:
Polish Journal of Management Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Satellite Image Fusion Using a Hybrid Traditional and Deep Learning Method
Autorzy:
Hammad, Mahmoud M.
Mahmoud, Tarek A.
Amein, Ahmed Saleh
Ghoniemy, Tarek S.
Powiązania:
https://bibliotekanauki.pl/articles/27314300.pdf
Data publikacji:
2023
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
deep learning image fusion
remote sensing image fusion
remote sensing optical image
pan-sharpening
remote sensing image
Opis:
Due to growing demand for ground-truth in deep learning-based remote sensing satellite image fusion, numerous approaches have been presented. Of these approaches, Wald’s protocol is the most commonly used. In this paper, a new workflow is proposed consisting of two main parts. The first part targets obtaining the ground-truth images using the results of a pre-designed and well-tested hybrid traditional fusion method. This method combines the Gram–Schmidt and curvelet transform techniques to generate accurate and reliable fusion results. The second part focuses on the training of a proposed deep learning model using rich and informative data provided by the first stage to improve the fusion performance. The demonstrated deep learning model relies on a series of residual dense blocks to enhance network depth and facilitate the effective feature learning process. These blocks are designed to capture both low-level and high-level information, enabling the model to extract intricate details and meaningful features from the input data. The performance evaluation of the proposed model is carried out using seven metrics such as peak-signal-to-noise-ratio and quality without reference. The experimental results demonstrate that the proposed approach outperforms state-of-the-art methods in terms of image quality. It also exhibits the robustness and powerful nature of the proposed approach which has the potential to be applied to many remote sensing applications in agriculture, environmental monitoring, and change detection.
Źródło:
Geomatics and Environmental Engineering; 2023, 17, 5; 145--162
1898-1135
Pojawia się w:
Geomatics and Environmental Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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