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Wyświetlanie 1-15 z 2056
Tytuł:
The prevalence of Entamoeba gingivalis in humans and its relationship with oral hygiene in Al-Muthanna province, southern Iraq
Autorzy:
Abbass, Z.A.
Mijbas, M.
Alomari, M.
Demkowska-Kutrzepa, M.
Powiązania:
https://bibliotekanauki.pl/articles/5627.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
prevalence
Entamoeba gingivalis
man
relationship
oral hygiene
Al-Muthanna province
Iraq
Źródło:
Annals of Parasitology; 2016, 62, Suppl.
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pracują u ben Ladena : dziesięć lat po zamachach na Nowy Jork widać jak na dłoni, że przyjęta wówczas strategia "wojny z terroryzmem" przyniosła efekt odwrotny do zamierzonego
Autorzy:
Abdul-Ahad, Ghaith (1975- ).
Powiązania:
Forum 2010, nr 36, s. 12-15
Data publikacji:
2010
Tematy:
Al-Kaida
Terroryzm Jemen od 2001 r.
Opis:
Tł. art. zamieszcz. w "Guardian News & Media". - 2010, 23 VIII.
Fot.
Dostawca treści:
Bibliografia CBW
Artykuł
Tytuł:
Modeling Pollution Index Using Artificial Neural Network and Multiple Linear Regression Coupled with Genetic Algorithm
Autorzy:
Abdulkareem, Iman Ali
Abbas, Abdulhussain A.
Dawood, Ammar Salman
Powiązania:
https://bibliotekanauki.pl/articles/2068477.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
Shatt Al-Arab river
comprehensive pollution index
multiple linear regression
artificial neural network
genetic algorithm
Opis:
Shatt Al-Arab River in Basrah province, Iraq, was assessed by applying comprehensive pollution index (CPI) at fifteen sampling locations from 2011 to 2020, taking into consideration twelve physicochemical parameters which included pH, Tur., TDS, EC, TH, Na+, K+, Ca+2, Mg+2, Alk., SO4-2, and Cl-. The effectiveness of multiple linear regression (MLR) and artificial neural network (ANN) for predicting comprehensive pollution index was examined in this research. In order to determine the ideal values of the predictor parameters that lead to the lowest CPI value, the genetic algorithm coupled with multiple linear regression (GA-MLR) was used. A multi-layer feed-forward neural network with backpropagation algorithm was used in this study. The optimal ANN structure utilized in this research consisted of three layers: the input layer, one hidden layer, and one output layer. The predicted equation of the comprehensive pollution index was created using the regression technique and used as an objective function of the genetic algorithm. The minimum predicted comprehensive pollution index value recommended by the GA-MLR approach was 0.3777.
Źródło:
Journal of Ecological Engineering; 2022, 23, 3; 236--250
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies on Microstructural Evolution and Wear Behaviour of AlNi intermetallic Reinforced AA6061 alloy in T6 condition
Autorzy:
Abuthakir, J.
Subramanian, Ramanathan
Somasundara Vinoth, K.
Venkatesh, G.
Suganya Priyadharshini, G.
Krishnakumar, K.
Powiązania:
https://bibliotekanauki.pl/articles/2125525.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al MMCs
peak aged (T6) condition
Al-Ni intermetallic reinforced composites
adhesive wear
Opis:
In the present investigation Ni particles were added in varying weight fractions (0.5, 1.0 and 1.5%) to AA6061 alloy during stir casting. To prepare Al-Ni intermetallic reinforced Aluminium Metal Matrix Composites (Al MMCs), as-cast samples were subjected to T6 treatment (Solutionization at 550°C followed by ageing at 2,4,6,8 and 10 hours). Base alloy was also subjected to T6 treatment for comparison purpose. Hardness of the samples were obtained using Vickers hardness test. Samples in the peak aged (T6) condition were subjected to metallographic examination. Influence of Ni particles on the hardness and grain refinement was investigated. X-ray Diffraction analysis of the Ni added samples revealed the presence of Al-Ni intermetallic phase formation in the peak aged (T6) Condition. Scanning Electron Microscope - Energy Dispersive X-Ray Spectroscopy analysis of composites in the peak aged (T6) condition were carried out to study the formation of the Al-Ni intermetallic phase. Effect of Al-Ni intermetallic phase on wear and friction behavior of the composite samples were studied and compared with that of the base alloy in the peak aged (T6) condition.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 3; 803--813
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigating Microplastics in the Mediterranean Coastal Areas – Case Study of Al-Hoceima Bay, Morocco
Autorzy:
Achoukhi, Iliass
El Hammoudani, Yahya
Dimane, Fouad
Haboubi, Khadija
Bourjila, Abdelhak
Haboubi, Chaimae
Benaissa, Chaimae
Elabdouni, Aouatif
Faiz, Hatim
Powiązania:
https://bibliotekanauki.pl/articles/24201691.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
Al-Hoceima bay
ATR-FTIR
microplastics
plastic
polymer
Opis:
The issue of microplastics pollution is gaining increasing attention as a global environmental concern. These tiny particles, measuring no more than 5 mm in size and coming in various shapes, can affect all types of marine eco-systems as they are easily consumed by a wide range of marine species. Al-Hoceima Bay, with its semi-enclosed nature and heavily affected anthropized coastline, was chosen as the study area for this research. The main objective was to investigate the presence of various microplastic types in Al-Hoceima Bay by implementing a sampling strategy along the coastline. This comprehensive approach was applied on a local scale within the bay (located in the northwest Mediterranean). Three stations were established in the bay, each located at different levels: the supralittoral, medilittoral and interlittoral. Microplastics were collected from these locations and classified into four categories based on their abundance. Digital microscopy was used to count the plastic particles and they were identified by Fourier transform-attenuated total reflectance infrared spectroscopy (ATR-FTIR). Results showed a higher presence of microplastics in water at 114 particles/L compared to sediment at 70 particles/L. The classification of samples revealed fibers as the most prevalent form, followed by fragments and films being the least commonly found. The abundance of fibers was found to be higher in water 90%, while in sediment it was 31%, however, fragments and leaves were found in higher concentrations in sediment. Polypropylene and polyethylene were identified as the major polymers used in the microplastics analyzed.
Źródło:
Journal of Ecological Engineering; 2023, 24, 5; 176--190
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Właściwości stopu Ti-6Al-4V po modyfikacji powierzchni
Properties of the biofunctionalized surface of Ti-6Al-4V alloy
Autorzy:
Adamek, G.
Jakubowicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/283787.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
Ti6Al4V
odporność korozyjna
wytrzymałość połączenia metal-ceramika
biozgodność
Ti-6Al-4V
corrosion resistance
metallic/ceramic bond strength
biocompatibility
Opis:
W pracy badano właściwości porowatego stopu Ti-6Al-4V istotne z punktu widzenia zastosowań na implanty tkanek twardych. Stop wytworzono za pomocą procesu mechanicznej syntezy, prasowania i spiekania. Modyfikację powierzchni prowadzono dwuetapowo: pierwszym było elektrochemiczne trawienie w 1M H3PO4 + 2% HF w 10 V przez 30 min, a drugim osadzanie ceramiki fosforanowo wapniowej (Ca-P) z wodnego roztworu 0,042M Ca(NO3)2 + 0,025M (NH4)2HPO4 + 0,1M HCl. Jony wapnia i fosforanowe osadzają się w głębi porów, co polepsza wytrzymałość połączenia ceramicznej powłoki z metalicznym podłożem. Wytrzymałość była o ponad 50% większa dla porowatego stopu niż dla litego odpowiednika. Odporność korozyjną badano w roztworze Hanka symulującym środowisko płynów ustrojowych (SBF). Po osadzaniu powłoki Ca-P zaobserwowano niewielką poprawę gęstości prądu korozyjnego w stosunku do próbki polerownej. Zbadano również biozgodność stopu po modyfikacji powierzchni w testach in vitro. Powierzchnia po elektrochemicznej modyfikacji wykazuje dobrą biozgodność, a powłoka Ca-P wspomaga wzrost i proliferację osteoblastów. Ze względu na porowatość, stosunkowo dobrą wytrzymałość połączenia i biokompatybilność powierzchni stop Ti-6Al-4Vpo elektrochemicznej modyfikacji wydaje się być dobrym materiałem na implanty tkanek twardych.
Properties of a porous Ti-6Al-4V alloy, important in hard tissue implants applications, were investigated. The alloy was prepared by mechanical alloying followed by pressing, sintering and subsequent anodic electrochemical etching in 1M H3PO4 + 2% HF elec¬trolyte at 10 V for 30 min and bioactive ceramic Ca-P layer deposition, using a mixture of 0.042M Ca(NO3)2 + 0.025M (NH4)2HPO4 + 0.1M HCl dissolved in distilled water. The Ca2+ and PO43- ions penetrate the pores preferentially inside, which results in improved bonding of the bioceramic layer to the metallic substrate. The bond strength obtained by a tensile test shows more than 50% higher strength to the porous Ti-6Al-4V substrate than to the bulk material. The corrosion resistance of the alloys was investigated in Hank's Balanced Salt Solution (HBSS) which is simulated body fluid (SBF). We observed slight improvement in corrosion current density after etching and additional Ca-P deposition compared to mechanically polished samples. The biocompatibility of the Ti-6Al-4V alloy with a porous Ca-P layer was investigated. We showed that the rough, electrochemically biofunctionalized sur¬face supported osteoblast cell growth and proliferation. Due to rough morphology, relatively strong bonding to the metallic substrate and in vitro biocompatibility the electrochemically modified surface of the ultrafine grained Ti-6Al-4V is promising for hard tissue implant applications.
Źródło:
Engineering of Biomaterials; 2013, 16, 120; 35-40
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Joining of the AMC Composites Reinforced with Ti3Al Intermetallic Particles by Resistance Butt Welding
Autorzy:
Adamiak, M.
Tomiczek, B.
Górka, J.
Czupryński, A.
Powiązania:
https://bibliotekanauki.pl/articles/353835.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
composite materials
intermetallics
Ti3Al
resistance butt welding
mechanical properties
Opis:
The introduction of new reinforcing materials continues to be investigated to improve the final behaviour of AMCs as well as to avoid some drawbacks of using ceramics as reinforcement. The present work investigates the structure, properties and ability of joining aluminium EN-AW 6061 matrix composite materials reinforced with Ti3Al particles by resistance butt welding as well as composite materials produced by mechanical milling, powder metallurgy and hot extrusion techniques. Mechanically milled and extruded composites show finer and better distribution of reinforcement particles, which leads to better mechanical properties of the obtained products. Finer microstructure improves mechanical properties of obtained composites. The hardness increases twice in the case of mechanically milled composites also, a higher reinforcement content results in higher particle dispersion hardening, for 15 wt.% of intermetallics reinforcement concentration composites reach about 400 MPa UTS. Investigation results of joints show that best hardness and tensile properties of joints can be achieved by altering soft conditions of butt welding process e.g. current flow time 1.2 s and current 1400 A. To improve mechanical properties of butt welding joints age hardening techniques can also be used.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 847-852
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ergasilus boleophthalmi sp. n. (Copepoda: Ergasilidae) parasitic on gobiid fishes from Shatt Al-Basrah Canal, South of Iraq
Autorzy:
Adday, T.
Ali, A.
Powiązania:
https://bibliotekanauki.pl/articles/840611.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
Ergasilus boleophthalmi
Copepoda
Ergasilidae
parasite
gobiid fish
Shatt Al-Basrah Canal
Iraq
animal parasite
Gobiidae
Boleophthalmus dussumieri
Bathygobius fuscus
mudskipper
dusky frillgoby
fish
new species
Źródło:
Annals of Parasitology; 2011, 57, 3
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ergasilus boleophthalmi sp. n. (Copepoda: Ergasilidae) parasitic on gobiid fishes from Shatt Al-Basrah Canal, South of Iraq
Autorzy:
Adday, T.
Ali, A.
Powiązania:
https://bibliotekanauki.pl/articles/2143376.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
Ergasilus boleophthalmi
Copepoda
Ergasilidae
parasite
gobiid fish
Shatt Al-Basrah Canal
Iraq
animal parasite
Gobiidae
Boleophthalmus dussumieri
Bathygobius fuscus
mudskipper
dusky frillgoby
fish
new species
Opis:
A new species of Ergasilus von Nordmann, 1832 (Copepoda: Ergasilidae) parasitic on the gills of two gobiid fishes Boleophthalmus dussumieri Valenciennes and Bathygobius fuscus (Rüppell, 1930) from Shatt Al-Basrah Canal, Iraq, is described. The new species differs from all its congeners by a combination of character states including the shape of the body, and the structure and armature of the swimming legs.
Źródło:
Wiadomości Parazytologiczne; 2011, 57, 3; 137-142
0043-5163
Pojawia się w:
Wiadomości Parazytologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
GIS based modeling of GWQ assessment at Al-Shekhan area using AHP and SAW techniques
Autorzy:
Ahmed, Mohammed F.
Faisal, Raid M.
Powiązania:
https://bibliotekanauki.pl/articles/118718.pdf
Data publikacji:
2020
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
AHP
SAW
GWQ
Al-Shekhan area
GIS
based model
Opis:
There is a continuous need to assess Groundwater Quality (GWQ) for human beneficial uses especially in areas suffering a shortage of nearby surface water. This study aims to assess GWQ of 56 wells located at Al-Shekhan area for drinking, irrigation, and livestock purposes. Analytical Hierarchical Process (AHP) technique is used to extract weights of parameters that are needed in the calculation of Simple Additive Weighting (SAW) technique. Maps are created using Geographical Information Systems (GIS), and these maps shows the classes of suitable areas for each purpose depending upon the calculated indices which are extracted from SAW technique. The results show that the final map classifies the suitable parts according to the drinking, irrigation and livestock purposes, and it shows that the north eastern part of the studied area is suitable for irrigation and livestock only. A model of GIS and AHP is built to assess the suitability of GWQ in Al-Shekhan area, and can be a raw model to be applied to assess GWQ in any other area after inserting the values of their parameters.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2020, 29, 2; 172-183
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Trace Elements (Co, Cr) on the Microstructure and Physical Properties of Al-Si-Cu-Mg-Fe Extruded Alloy
Autorzy:
Ahn, S. S.
Sharief, P.
Lee, C. H.
Son, H. T.
Kim, Y. H.
Kim, Y. C.
Hong, S.
Hong, S. J.
Powiązania:
https://bibliotekanauki.pl/articles/352787.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al-Si alloy
microstructure
extrusion
coefficient of thermal expansion
trace elements
Opis:
Trace elements Co, Cr were added to investigate their influence on the microstructure and physical properties of Al-Si extruded alloy. The Co, Cr elements were randomly distributed in the matrix, forms intermetallic phase and their existence wereconfirmed by XRD, EDS and SEM analysis. With addition of trace elements, the microstructure was modified, Si particle size was reduced and the growth rate of β-(Al5 FeSi) phase limited. Compared to parent alloy, hardness and tensile strength were enhanced while the linear coefficient of thermal expansion (CTE) was significantly reduced by 42.4% and 16.05% with Co and Cr addition respectively. It is considered that the low CTE occurs with addition of Co was due to the formation of intermetallic compound having low coefficient of thermal expansion. The results suggested that Co acts as an effective element in improving the mechanical properties of Al-Si alloy.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 857-862
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of pouring temperature on the mechanical properties of Al5.9Cu1.9Mg alloy
Autorzy:
Akhyar, Akhyar
Iswanto, P.T.
Malau, V.
Powiązania:
https://bibliotekanauki.pl/articles/2201133.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
mechanical properties
Al-Cu-Mg alloy
casting metal
pouring temperature
właściwości mechaniczne
Stop Al-Cu-Mg
metal odlewniczy
temperatura odlewania
Opis:
Purpose: This experiment aims to determine the influence of pouring temperature on the hardness, impact energy, tensile strength, and changes in the microstructure of the Al-5.9Cu- 1.9Mg alloy. Design/methodology/approach: A total of three samples of aluminium alloy were heated to 688, 738, and 788°C, and poured into permanent moulds in form of plates at a constant temperature of 220°C. The cast products are machined according to testing standards for hardness, impact tests, and tensile strength. Findings: The results showed that the metal hardness and impact energy increased to 103 BHN and 7.48 J at 788°C, respectively, while the tensile strength rises as the temperatures decreases. Furthermore, the changes in the microstructure were affected, which indicated that all the properties of the aluminium alloy were influenced by the variations in temperature. Research limitations/implications: During the metal casting process, only three different pouring temperatures affected the properties of the metal alloy, therefore, there is a need for more variations. Practical implications: The proposed pouring temperature parameter is an important condition for industrial foundry applications to obtain the right product for use in a machining element. Originality/value: This research shows the influence of the difference in pouring temperatures on the properties of metal alloys due to casting, where they will be adapted for a particular use.
Źródło:
Archives of Materials Science and Engineering; 2022, 113, 2; 49--55
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 2056

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