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Tytuł:
Characterization of granites by 57Fe Mössbauer spectroscopy
Autorzy:
Hassan, K. M.
Powiązania:
https://bibliotekanauki.pl/articles/2086557.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Mineralogiczne
Tematy:
granitic type
clinopyroxene
mica
amphibole
Mössbauer spectroscopy
oxygen fugacity
Western Desert
Opis:
Two granite complexes in Egypt, a sodic type and an aluminous type are characterized by Mössbauer spectroscopy. Mössbauer spectra (MS) of the sodic granite show a major doublet of ferric (Fe3+) iron that is attributable to octahedral coordination (M1) sites plus/minus a tetrahedron Fe3+ doublet plus/minus a doublet of ferrous (Fe2+) iron on the M1 sites plus/ minus another Fe2+ (M1) doublet and a sextet of Fe3+. The sextet is attributed to -Fe2O3 (hematite) and the other Fe components are due to NaCaFeSi2O6 (aegirine-augite) plus/minus minor contributions from (Ca2(Mg,Fe)5(Si,Al)8O22(OH)2 (magnesium-hornblende). Changes in the quadrupole splitting and width line of Fe2+ ions are likely composition-related. The MS of the aluminous-type granite, on the other hand, shows evidence only of single doublets containing Fe2+ or Fe3+ in the octahedral M1 sites, with parameters that remain almost constant. This consistency implies that the existing minerals – K(Mg,Fe2+)3 (Al,Fe3+)Si3O10(OH,F)2 (biotite), (Mg,Fe)6(Si,Al)4O10(OH)8 (clinochlore), (Na,K)Ca2(Fe,Mg)5(Al,Si)8O22(OH)2 (ferrohornblende and magnesiohornblende) – have similar iron positions. The intensity of iron oxidized (Fe3+/Fe) for the sodic granite is 79.1 to 100% and for the aluminous granite, 28.4 to 38.2%. The observed Fe3+/Fe differences between the two granites are source- -related and consistent with distributions of other redox-sensitive elements.
Źródło:
Mineralogia; 2009, 40, 1/4; 95--106
1899-8291
1899-8526
Pojawia się w:
Mineralogia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Note on the stable isotope values of vein calcite in the El-Seboah peralkaline granite (SW Egypt)
Autorzy:
Hassan, K. M.
Powiązania:
https://bibliotekanauki.pl/articles/2086543.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Mineralogiczne
Tematy:
δ13C
δ18O
carbonate-hosting veins
peralkaline granite
Egypt
Opis:
Stable isotope data for carbon (δ13C) and oxygen (δ18O) are used to constrain the environments of calcite formation in two veins in the El-Seboah peralkaline granite in south-western Egypt. Vein I with calcitemagnetite-goethite-hematite-quartz, and vein II with calcite-magnetite-goethite-kaolinite-hematite-quartz are texturally distinct. The calcite of each vein has characteristic δ13C- and δ18O-values: + 0.32 and -7.28‰ for vein I and + 1.16 and - 1.21‰ for vein II, respectively. The observed differences between the δ13C values of the two veins indicate that they represent two separate systems of primary dissolved inorganic carbon formed at or near equilibrium with atmospheric CO2. The δ18O values, on the other hand, indicate calcite deposition from meteoric waters which were fresh for vein I and brackish for vein II.
Źródło:
Mineralogia; 2011, 42, 2/3; 113--120
1899-8291
1899-8526
Pojawia się w:
Mineralogia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Valences and site characteristics of iron in radioactive magmatic veins (Egypt): A Mössbauer and chemical study
Autorzy:
Hassan, K. M.
Powiązania:
https://bibliotekanauki.pl/articles/2086544.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Mineralogiczne
Tematy:
Egypt
Mössbauer
peralkaline rocks
aegirine-augite
Fe-oxide phases
radioactive/rare metals
Opis:
Radioactive veins in shear zones of the El-Seboah granite in Egypt with anomalous concentrations of Nd, Ce, Zr, Y, Nb, Sm, Th and U were studied by petrographic microscopy, x-ray diffraction, 57Fe Mössbauer and wet chemical methods. The veins are composed essentially of quartz, aegirine-augite and minor K-feldspar ± α-iron oxide (hematite) ± γ-iron oxide hydroxide (goethite). They likely represent late-stage felsic melt that was quenched and devitrified at high temperature to yield crystals and crystallites, and then subjected to low temperature alteration during which most of the K feldspar transformed to kaolinite and opal. Mössbauer parameters of the samples indicate that the existing Fe-bearing minerals are primary, with appreciable ordering in the Fe sites. The bulk-sample iron (ΣFe) contents are extremely high (12.3-22.4%). The extent of oxidation of the Fe has been found to be 100% by Mössbauer spectroscopy and 95.36-99.69% by a chemical method. These conditions of Fe enrichment and strong oxidation suggest that the veins are extreme differentiates of granite magmas where high states of oxygen fugacity prevailed.
Źródło:
Mineralogia; 2010, 41, 1/2; 23--33
1899-8291
1899-8526
Pojawia się w:
Mineralogia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extended finite element numerical analysis of scale effect in notched glass fiber reinforced epoxy composite
Rozszerzona analiza numeryczna metodą elementów skończonych efektu skali w epoksydowym kompozycie z karbem wzmocnionym włóknem szklanym
Autorzy:
Abdellah, M. Y.
Alsoufi, M. S.
Hassan, M. K.
Ghulman, H. A.
Mohamed, A. F.
Powiązania:
https://bibliotekanauki.pl/articles/139922.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
XFEM
extended finite element method
composite laminate
fracture processing zone
crack opening displacement
rozszerzona metoda elementów skończonych
laminat kompozytowy
strefa procesu pęknięcia
przemieszczenie otworu szczeliny
Opis:
Nominal strength reduction in cross ply laminates of [0/90]2s is observed in tensile tests of glass fiber composite laminates having central open hole of diameters varying from 2 to 10 mm. This is well known as the size effect. The extended finite element method (XFEM) is implemented to simulate the fracture process and size effect (scale effect) in the glass fiber reinforced polymer laminates weakened by holes or notches. The analysis shows that XFEM results are in good agreement with the experimental results specifying nominal strength and in good agreement with the analytical results based on the cohesive zone model specifying crack opening displacement and the fracture process zone length.
Zmniejszenie nominalnej wytrzymałości laminatu warstwowego z poprzecznym ułożeniem włókien typu [0/90]2s jest obserwowane dla naprężeń rozciągających w laminatach kompozytowych z włóknem szklanym mających centralny otwór o średnicy od 2 do 10 mm. Jest to dobrze znany efekt rozmiaru (efekt skali). Rozszerzona analiza metodą elementów skończonych (XFEM) została zastosowana w celu symulacji procesu pękania i efektu skali w polimerowych laminatach z włóknem szklanym osłabionych obecnością karbu lub otworu. W pracy wykazano, że wyniki metody XFEM dotyczące wytrzymałości nominalnej są zgodne z danymi eksperymentalnymi, dobrze zgadzają sią z wynikami analitycznymi opartymi na modelu strefy spójnej i pozwalają określić przemieszczenie otworu szczeliny i długość strefy procesu pęknięcia.
Źródło:
Archive of Mechanical Engineering; 2015, LXII, 2; 217-236
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A unified representation of some starlike and convex harmonic functions with negative coefficients
Autorzy:
El-Ashwah, R. M.
Aouf, M. K.
Hassan, A. A. M.
Hassan, A. H.
Powiązania:
https://bibliotekanauki.pl/articles/952819.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
harmonic
analytic
univalent
sense-preserving
extreme points
Opis:
In this paper we introduce a unified representation of starlike and convex harmonic functions with negative coefficients, related to uniformly starlike and uniformly convex analytic functions. We obtain extreme points, distortion bounds, convolution conditions and convex combinations for this family.
Źródło:
Opuscula Mathematica; 2013, 33, 2; 273-281
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The pulmonary involvement in Theileria lestoquardi naturally infected sheep
Autorzy:
El Imam, A.H.
Hassan, S.M.
Gameel, A.A.
El Hussein, A.M.
Taha, K.M.
Powiązania:
https://bibliotekanauki.pl/articles/6255.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Parazytologiczne
Opis:
Malignant Ovine Theileriosis (MOT) caused by Theileria lestoquardi is considered a major constraint for sheep production in many areas of the world including Sudan. Pulmonary oedema is thought to be the main cause of animal death, but the mechanism, the cell types involved and/or the probable cause of this pneumonia has yet to be defined. The present study was carried out to investigate the pulmonary involvement post T. lestoquardi infection and to identify the cell types involved in pneumonia. Apparently healthy sheep were exposed to ticks challenge in T. lestoquardi endemic area. Lungs impression smears and tissue sections for histopathology were processed. At necropsy, fifteen infected sheep revealed severe pneumonia associated with oedema and accumulation of creamygrayish frothy exudates. The microscopic findings of examined lungs showed emphysema, congestion, collapse and proliferation of immense amount of different kinds of cells. The current study indicates that T. lestoquardi infections are accompanied with remarkable pulmonary involvements and may lead to respiratory failure and death.
Źródło:
Annals of Parasitology; 2016, 62, 1
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molecular identification of different Theileria and Babesia species infecting sheep in Sudan
Autorzy:
El Imam, A.E.
Hassan, S.M.
Gameel, A.A.
El Hussein, A.M.
Taha, K.M.
Oosthuizen, M.C.
Powiązania:
https://bibliotekanauki.pl/articles/5972.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Parazytologiczne
Opis:
The epidemiological aspects of sheep piroplasmosis in Sudan are poorly studied, and further investigations using sensitive and precise techniques are required. In this study, the Reverse Line Blot (RLB) hybridization assay was used to detect and simultaneously differentiate between Theileria and Babesia species. DNA was extracted from blood collected on filter paper (n=219) from apparently healthy sheep from six different geographical localities in Sudan. Results indicated that Theileria ovis (88.6%), T. separata (20.1%), T. lestoquardi (16.4%) and T. annulata (16.4%) DNA could be detected in the blood samples. Single and mixed Theileria infections were detected in 74 (33.8%) and 124 (56.6%) respectively and T. ovis being the most prevalent species in the country. T. ovis and T. separata were reported for the first time in sheep in Sudan.
Źródło:
Annals of Parasitology; 2016, 62, 1
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and Implementation of an Embedded System for Ambulatory Cardiac Monitoring
Autorzy:
Hassan, E. M. E.
Mohammed, K.
Powiązania:
https://bibliotekanauki.pl/articles/308491.pdf
Data publikacji:
2012
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
arrhythmia
ECG
embedded system
GSM communication
heart rate
telemedicine
Opis:
Cardiac monitoring in the environment of the subject is one of the major fields of telemedicine. In this paper we present a prototype of embedded system for acquisition, storage, display on LCD or PC and transfer via GSM alarm warning in case of arrhythmias, which allows a great opportunity for rapid intervention of the physician. In terms of hardware, we have designed and implemented our system with a modular approach to facilitate development and debugging. Thus the system comprises three modules: analog module, digital module microcontroller-based for certain pretreatment, and a GSM communication module. Of course, there is appropriate software behind the material described. The system has the following features: low cost, ease to implement and versatility.
Źródło:
Journal of Telecommunications and Information Technology; 2012, 1; 23-32
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Concentration of Copper and Lead in Market Milk and Milk Products of Bangladesh
Autorzy:
Shahriar, S. M. S.
Akther, S.
Akter, F.
Morshed, S.
Alam, M. K.
Saha, I.
Halim, M. A.
Hassan, M. M.
Powiązania:
https://bibliotekanauki.pl/articles/412537.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Heavy metal
copper
lead
milk
milk products
Opis:
The aim of this work is to detect and estimate the level of selected heavy metals (copper and lead) in milk and milk products in Chittagong City Corporation Areas of Bangladesh. The most important milk and milk products that are likely to be an important contributor to heavy metal exposure was selected. Total 30 samples of milk and milk products were analyzed among these 20 raw milk samples was collected from 20 dairy farms around industrial area in Chittagong City and 10 milk product samples were collected from market in Chittagong City. Detection and estimation of the level of copper and lead were carried out by using “Analytikjena Atomic Absorption Spectrophotometer, model: ZEEnit700P, Germany”. It was found that, most of all milk samples contain copper and lead copper and lead. The content of copper in most of all raw milk and milk products were in the range from 0.02 mg/kg to 0.25 mg/kg. The highest level of copper was found 0.244 mg/kg in milk products. The concentration of lead in milk and milk products were in the range from 0.007 mg/kg to 0.02 mg/kg. The highest concentration of lead was found 0.019 mg/kg in raw milk. These values were compared with standard allowable limit and also with the corresponding values of different countries available in literature.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 8; 56-63
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Responses of maize varieties to salt stress in relation to germination and seedling growth
Autorzy:
Hassan, N.
Hasan, Md.K.
Shaddam, Md.O.
Islam, M.S.
Barutcular, C.
EL Sabagh, A.
Powiązania:
https://bibliotekanauki.pl/articles/11757.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Źródło:
International Letters of Natural Sciences; 2018, 69
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental investigations and finite element modelling of a suggested prosthetic foot
Autorzy:
Jweeg, M.J.
Hassan, A.K.
Almudhaffa, M.M.
Powiązania:
https://bibliotekanauki.pl/articles/24200551.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
prosthetic foot design
Kenaf fibre
dynamic foot analysis
composite materials
konstrukcja stopy protetycznej
włókno kenaf
analiza stopy dynamiczna
materiały kompozytowe
Opis:
Purpose: To design and manufacture a dynamic cheap prosthetic foot compatible with amputees' requirements by introducing a natural fibre called kenaf (scientific name Hibiscus cannabinus L). Design/methodology/approach: In two cases, four suggested designs were analysed using the finite elements method (FEM) with a commercial ANSYS R1 program. The first case was a heel strike. The second was toe-off by subjecting force equal to 70 kg for both cases to select the optimal design. Findings: The foot found the tensile strength, flexural strength, impact stress, and fatigue test according to ISO 10328 standards successfully. Research limitations/implications: The selected design was analysed again using the ANSYS R1 program for weights 60, 70, and 80 kg for two sequences, one containing kenaf, to study how such additive could affect the mechanical properties and estimate the proper quality weight of the foot. The winner's design was then produced and tested in a fatigue foot tester according to ISO 10328 standards. Practical implications: The results showed that the sequence containing the natural fibres kanaf material improved the deformation by 20% for both cases (from 7.47 to 8.92 mm for the heel strike case for a weight of 80 kg for the sequence without and with kanaf, respectively), and the damping ratio increased by 50% (0. 188 and 0.273 for the sequence without and with kenaf, respectively), which means an increase in the stored energy and higher stability. Also, the mechanical properties like maximum tensile strength, flexural strength, impact stress, and natural frequency were modified. Originality/value: This paper develops an analytical and practical study to design and produce a dynamic cheap prosthetic foot made from natural fibres, which are characterized as renewable, cheap, recyclable, and environmentally friendly materials with good mechanical properties. Authors believe it is the first time to use natural kenaf fibres in the prosthetic foot manufacturing field.
Źródło:
Archives of Materials Science and Engineering; 2022, 115, 1; 21--33
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Sportswear Fabric Properties on the Health and Performance of Athletes
Wpływ właściwości materiałów używanych do produkcji ubiorów sportowych na zdrowie i wydajności sportowców
Autorzy:
Hassan, M.
Qashqary, K.
Hassan, H. A.
Shady, E.
Alansary, M.
Powiązania:
https://bibliotekanauki.pl/articles/232509.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
sportowa tkanina
fizjologiczne reakcje sportowców
wydajność sportowców
właściwości materiałów
przepuszczalność pary wodnej
właściwości ubioru a wydolność organizmu
sportswear fabrics
comfort properties
athletes' physiological responses
performance of athlets
Opis:
The main goal of this work was to study the Influence of sportswear fabric properties on the physiological responses and performance of athletes. The influence of three different types of sportswear fabrics on the physiological response and performance of volunteers in sports conditions was investigated. The fabrics and garments tested were made of 100% cotton, a 65/35 polyester/cotton blend and 100% polyester fibres. Seven volunteer were selected to wear the sportswear during the physical exercise assigned and their physiological responses were tested. The results of the study show a statistically significant effect on the athletes' physiological responses and performance parameters measured for the different types of sportswear tested. The sample with 100% polyester produced the best physiological responses and performance from the athletes. This effect can be related to better moisture management, which reflects the amount of relative water vapour permeability (68%) and lower thermal conductivity. This will enhance the body's temperature regulation leading to increase athletes' cardiorespiratory fitness and performance. The results also show the high correlation between the sportswear fabrics properties and athletes' physiological responses and performance, except the relationship between the end-tidal partial pressure of oxygen (PETO2) and fabric thickness (h), air permeability (AP) and thermal resistance (r), which are not highly correlated. The other correlation values vary between (š0.62 and (š1).
Badano właściwości ubiorów sportowych na fizjologiczną odpowiedź oraz wytrzymałość organizmu. Przebadano trzy rożne rodzaje ubiorów wykonanych z 100% bawełny, mieszanki 65/35 poliester/bawełna oraz 100% poliestru. Wytypowano 7 ochotników, którzy w przygotowanych ubiorach wykonywali zaprogramowane ćwiczenia a następnie poddano ich badaniom. Wyniki opracowano statystycznie i wykazano, że najkorzystniejsze właściwości posiada odzież wykonana ze 100% poliestru. Wynik ten można tłumaczyć lepszymi właściwościami transportu wilgoci wynikającymi z poziomu przepuszczalności pary wodnej i niższą przewodnością termiczną. Właściwości te wpływają na zachowanie się organizmu a zwłaszcza na sprawność układu krążeniowo-oddechowego, a tym samym wydolność organizmu. Wykazano korelację pomiędzy właściwościami ubioru a wydolnością organizmu za wyjątkiem korelacji pomiędzy grubością materiału a wydechowym cieśnieniem parcjalnym tlenu (PETO2) oraz przepuszczalnością powietrza i opornością cieplną.
Źródło:
Fibres & Textiles in Eastern Europe; 2012, 4 (93); 82-88
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nickelization Effect on the High Temperature Tensile Properties of Mg-0.7Y2O3 Nanocomposite
Autorzy:
Hassan, S. F.
Tun, K. S.
Patel, F.
Al-Aqeeli, N.
Gupta, M.
Powiązania:
https://bibliotekanauki.pl/articles/357046.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
magnesium
nanocomposite
high-temperature
tensile strength
deformation
Opis:
In this study, high performance magnesium-yttria nanocomposite’s room temperature, strength and ductility were significantly enhanced by the dispersion of nano-sized nickel particles using powder blending and a microwave sintering process. The strengthening effect of the dispersed nano-sized nickel particles was consistent up to 100°C and then it gradually diminished with further increases in the test temperature. The ductility of the magnesium-yttria nanocomposite remained unaffected by the dispersed nano-sized nickel particles up to 100°C. Impressively, it was enhanced at 150°C and above, leading to the possibility of the near net shape fabrication of the nanocomposite at a significantly low temperature.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 3; 1411-1415
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
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