Skocz do pozycji: 1.

Tytuł:

Study of big Movement of Temporary Sheet Pile in Elatf Power plant North of Egypt using Finite Element Analysis

Autorzy:

Mohamed, A. A.

Powiązania:

https://bibliotekanauki.pl/articles/115733.pdf

Data publikacji:

2014

Wydawca:

Fundacja na Rzecz Młodych Naukowców

Tematy:

finite element analysis
sheet pile
soil profile
3D analysis
2D analysis

Opis:

The failure of sheet pile walls used for temporary works may cause loss of project construction time and money. The failure can be due to lack of knowledge about the soil conditions or a requirement of three dimension analysis, as it may be important for some cases. In this paper a study was made for a big movement during temporary excavation works using sheet pile walls. A back analysis was made using three and two dimensional finite element analysis as well as simple manual calculation in order to find out the causes of the big movement. The results from the analysis was represented and compared with field data and observation. The results from the two dimensional analysis showed higher values than that from three dimensional analysis and both indicated lower results than that from field observation. However the wall movement values deduced from F.E. indicated possible failure. The performed simple manual calculation indicated also failure. The general conclusion was considered that the failure was due to design mistake.

Źródło:

Challenges of Modern Technology; 2014, 5, 1; 28-33
2082-2863
2353-4419

Pojawia się w:

Challenges of Modern Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 2.

Tytuł:

A new BEM for modeling and simulation of 3T MDD laser-generated ultrasound stress waves in FGA smart materials

Autorzy:

Fahmy, Mohamed A.

Powiązania:

https://bibliotekanauki.pl/articles/29520102.pdf

Data publikacji:

2021

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

oundary element method
modeling and simulation
three-temperature
memory-dependent derivative
laser ultrasonic
nonlinear thermal stress waves
functionally graded anisotropic
smart materials

Opis:

The goal of this study is to present a new theory known as the three-temperature memory-dependent derivative (MDD) of ultrasound stress waves in functionally graded anisotropic (FGA) smart materials. It is extremely difficult to address the difficulties related to this theory analytically due to its severe nonlinearity. As a result, we suggest a new boundary element method (BEM) to solve such equations. The suggested BEM technique incorporates the benefits of both continuous and discrete descriptions. The numerical results are visually represented to demonstrate the impacts of MDD three temperatures and anisotropy on the ultrasound stress waves in FGA smart materials. The numerical findings verify the proposed methodology’s validity and accuracy. We may conclude that the offered results are useful for comprehending the FGA smart materials. As a result, our findings contribute to the advancement of the industrial applications of FGA smart materials.

Źródło:

Computer Methods in Materials Science; 2021, 21, 2; 95-104
2720-4081
2720-3948

Pojawia się w:

Computer Methods in Materials Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

Uncertainty and accuracy of vision-based tracking concerning stereophotogrammetry and noise-floor tests

Autorzy:

Ngeljaratan, Luna
Moustafa, Mohamed A.

Powiązania:

https://bibliotekanauki.pl/articles/2051854.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

stereophotogrammetry
noise-floor
vision-based tracking
displacement
uncertainty
accuracy

Opis:

This work proposes a systematic assessment of stereophotogrammetry and noise-floor tests to characterize and quantify the uncertainty and accuracy of a vision-based tracking system. Two stereophotogrammetry sets with different configurations, i.e., some images are designed and their sensitivity is quantified based on several assessments. The first assessment evaluates the image coordinates, stereo angle and reconstruction errors resulting from the stereophotogrammetry procedure, and the second assessment expresses the uncertainty from the variance and bias errors measured from the noise-floor test. These two assessments quantify the uncertainty, while the accuracy of the vision-based tracking system is assessed from three quasi-static tests on a small-scaled specimen. The difference in each stereophotogrammetry set and configuration, as indicated by the stereophotogrammetry and noise-floor assessment, leads to a significant result hat the first stereophotogrammetry set measures the RMSE of 3.6 mm while the second set identifies only 1.6 mm of RMSE. The results of this work recommend a careful and systematic assessment of stereophotogrammetry and noise-floor test results to quantify the uncertainty before the real test to achieve a high displacement accuracy of the vision-based tracking system.

Źródło:

Metrology and Measurement Systems; 2022, 29, 1; 75-92
0860-8229

Pojawia się w:

Metrology and Measurement Systems

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

Identification of water treatment plant based on feedforward neural network

Autorzy:

Mohamed, A. F.
Radwa, H. Z.

Powiązania:

https://bibliotekanauki.pl/articles/971051.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Instytut Badań Systemowych PAN

Tematy:

water treatment plant
coagulation process
PID
neural network control

Opis:

Coagulation process is the main process in conventional water treatment process sequence. It influences the following treatment process aspects: maintaining plant efficiency and increasing the quality of the produced water. This is accomplished by adding chemicals to raw water, such as alum sulphate. To secure the appropriate plant performance, a mathematical model is proposed in this paper for the coagulation unit, followed by the development of the control strategy. Classic PID and neural network based controller regulating the process are used. Tests were performed, based on the real data for water treatment, using MATLAB/SIMULINK. Simulation results showed better values for both settling time and overshoot in the case of using neural network based controller than PID.

Źródło:

Control and Cybernetics; 2017, 46, 3; 247-258
0324-8569

Pojawia się w:

Control and Cybernetics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

Unconventional alternatives for control of tomato root rot caused by Rhizoctonia solani under greenhouse conditions

Autorzy:

Hamza, A.
Mohamed, A.
Derbalah, A.

Powiązania:

https://bibliotekanauki.pl/articles/66331.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

biological agent
control
tomato
root rot
Rhizoctonia solani
greenhouse condition
plant oil
nanoparticle

Opis:

This study was done to assess the antifungal effect of some biocontrol agents effective microorganisms (EMs1), Pseudomonas fluorescences, and Bacillus pumilus, titanium dioxide (TiO2) nanoparticles, black cumin and wheat germ oils as well as the recommended fungicide (flutolanil) against root rot of tomato. Moreover, gas chromatography-mass spectrometry (GC-MS) examination was completed to identify the bioactive compounds in plant oils (dark cumin and wheat germ). Also the impact of these medicines on some biochemical and growth parameters of tomato was examined. Flutolanil was the best treatment followed by dark cumin, TiO2, EMs1, Pseudomonas fluorescens, Bacillus pumilus and wheat germ oil, individually in both test seasons. The outcomes demonstrated a marked increase in each biochemical character (chlorophyll substance, peroxidase and polyphenoloxidase) and plant development (height and fresh and dry weight) under all the tried treatments in comparison to the controls.

Źródło:

Journal of Plant Protection Research; 2016, 56, 3
1427-4345

Pojawia się w:

Journal of Plant Protection Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

Experimental and Computational Vibration Study of Amino Acids

Autorzy:

Mohammed, M. E.
Mohamed, A. M. A.

Powiązania:

https://bibliotekanauki.pl/articles/412478.pdf

Data publikacji:

2013

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Vibrational studies
Amino Acids
semi-empirical methods (PM6 and RM1)
ab initio methods (B3LYP/6-31+G(d)

Opis:

Vibrational studies of amino acids experimentally and theoretically have been performed. The Semi-empirical methods optimization by PM6 and RM1 on the l- and d-amino acids (alanine, phenylalanine, aspartic and glutamic acid), showed no difference in energy between l-and d-isomers. The vibrational frequencies were calculated by semi-emprical methods (PM6 and RM1) and ab initio methods (B3LYP/6-31+G(d) and were scaled down by factors of 0.925 (RM1), 1.09 (PM6) and 0.89 (B3LYP/6-31+G(d)). The calculated and experimental vibrational frequencies have shown good general agreement.

Źródło:

International Letters of Chemistry, Physics and Astronomy; 2013, 10, 1; 1-17
2299-3843

Pojawia się w:

International Letters of Chemistry, Physics and Astronomy

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

Exploitation of spent nickel-metal hydride (Ni-MH) batteries as a source of value-added products

Autorzy:

Farghal, Fatma E.
Abdel-Khalek, Mohamed A.

Powiązania:

https://bibliotekanauki.pl/articles/2146864.pdf

Data publikacji:

2021

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

nickel–metal hydride
batteries
nickel
recovery
cementation
leaching
recycling

Opis:

Spent Nickel–metal hydride batteries can be sources of valuable metals such as nickel, cobalt, manganese, rare earths and toxic chemicals. The recycling of these materials is necessary from both economic and environmental points of view. In this study the nickel is leached in acid solution followed by precipitation and thermal decomposition or by cementation. The affecting parameters such as acid type and concentration, time, temperature and solid/liquid ratio were investigated. The maximum of leached nickel could be obtained in 3M sulfuric acid at 65°C for 60 min with solid-to-liquid ratio of 30 g L-1. The liquid film is a more suitable model for demonstrating the kinetics of the nickel leaching. Thermal decomposition of the precipitated nickel dimethyl-glyoxime was employed in preparation of nickel oxide. Nickel was separated from aqueous solution by cementation on zinc. The cementation process follows pseudo first-order kinetics and diffusion controlling steps. The yield was 91% of the original nickel content.

Źródło:

Physicochemical Problems of Mineral Processing; 2021, 57, 6; 95--101
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

Low Back Muscle Activity in an Automobile Seat with a Lumbar Massage System

Autorzy:

Kolich, M.
Taboun, S. M.
Mohamed, A. I.

Powiązania:

https://bibliotekanauki.pl/articles/90384.pdf

Data publikacji:

2000

Wydawca:

Centralny Instytut Ochrony Pracy

Tematy:

automotive seating
electromyography
low back pain
ból pleców
elektromiografia
masaż

Opis:

This investigation was conducted to determine the effects of a massaging lumbar support system on low back muscle activity. The apparatus included a luxury-level automobile seat, six 10-mm diameter bipolar surface electrodes, an amplifier, an anaiog-to-digital conversion board, data acquisition software, and a personal computer. Six experimental conditions, each involving a variation of massage time, were considered. The dependent variable was the change in the root mean square variation of the EMG signal. One minute of lumbar massage every 5 min was found to have a beneficial effect on low back muscle activity (as compared to no massage). This may prove to be an extremely important result in the quest to combat low back pain attributable to automobile seating.

Źródło:

International Journal of Occupational Safety and Ergonomics; 2000, 6, 1; 113-128
1080-3548

Pojawia się w:

International Journal of Occupational Safety and Ergonomics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

Effect of foliar application of Sida compound fertilizer on growth, yield, and fruit chemical composition of "Early Superior" grapevine

Autorzy:

Mohamed, A.-R.M.A.
Abdel-Aziz, F.H.
Mohamed, M.A.
Gobara, A.

Powiązania:

https://bibliotekanauki.pl/articles/2087.pdf

Data publikacji:

2013

Wydawca:

Instytut Ogrodnictwa

Tematy:

foliar application
natural fertilizer
growth
vegetative growth
yield
fruit
chemical composition
grape-vine
Early Superior cultivar
leaf mineral content

Źródło:

Journal of Horticultural Research; 2013, 21, 2
2300-5009

Pojawia się w:

Journal of Horticultural Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

The impact of smart transformer on different radialdistribution systems

Autorzy:

Mahmoud, Ibrahem Mohamed A.
Abdelsalam, Tarek Saad
Swief, Rania

Powiązania:

https://bibliotekanauki.pl/articles/1841278.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

smart transformer
smart grid
direct approach
power flow
power loss reduction
inteligentny transformator
inteligentna sieć
bezpośrednie podejście
przepływ mocy
redukcja strat mocy

Opis:

The work is intended to extend the application of a smart transformer on a radialdistribution system. In this paper, an updated algorithm on the backward/forward powerflow is introduced. The so-called direct approach of power flow is employed and analyzed.In addition, the paper focused on integrating a smart transformer to the network and solvingthe updating network also using the direct approach load flow. The solution of the smarttransformer using the direct approach power flow method is quite straightforward. Thismodel is applied to radial distribution systems which are the IEEE 33- and IEEE 69-bussystems as a case study. Also, the paper optimizes the best allocation of the smart transformerto reduce the power losses of the grid.

Źródło:

Archives of Electrical Engineering; 2021, 70, 2; 271-283
1427-4221
2300-2506

Pojawia się w:

Archives of Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

Tytuł:

CuO–water mhd mixed convection analysis and entropy generation minimization in double-lid–driven u-shaped enclosure with discrete heating

Autorzy:

Mliki, Bouchmel
Miri, Rached
Djebali, Ridha
Abbassi, Mohamed A.

Powiązania:

https://bibliotekanauki.pl/articles/2204647.pdf

Data publikacji:

2023

Wydawca:

Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej

Tematy:

U-shaped enclosure
MHD mixed convection
nanoliquids
double lid-driven cavity
entropy generation
LBM

Opis:

The present study explores magnetic nanoliquid mixed convection in a double lid–driven U-shaped enclosure with discrete heat-ing using the lattice Boltzmann method (LBM) numerical method. The nanoliquid thermal conductivity and viscosity are calculated using the Maxwell and Brinkman models respectively. Nanoliquid magnetohydrodynamics (MHD) and mixed convection are analyzed and entropy generation minimisation has been studied. The presented results for isotherms, stream isolines and entropy generation describe the interaction between the various physical phenomena inherent to the problem including the buoyancy, magnetic and shear forces. The operating parameters’ ranges are: Reynolds number (Re: 1–100), Hartman number (Ha: 0–80), magnetic field inclination (γ: 0°–90°), nanoparticles volume fraction (ϕ: 0–0.04) and inclination angle (α: 0°–90°). It was found that the and the total entropy generation augment by increasing Re, ϕ: and γ. conversely, an opposite effect was obtained by increasing Ha and α. The optimum magnetic field and cavity inclination angles to maximum heat transfer are γ = 90° and α = 0.

Źródło:

Acta Mechanica et Automatica; 2023, 17, 1; 112--123
1898-4088
2300-5319

Pojawia się w:

Acta Mechanica et Automatica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

Second law analysis of mhd forced convective nanoliquid flow through a two-dimensional channel

Autorzy:

Miri, Rached
Abbassi, Mohamed A.
Ferhi, Mokhtar
Djebali, Ridha

Powiązania:

https://bibliotekanauki.pl/articles/2204682.pdf

Data publikacji:

2022

Wydawca:

Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej

Tematy:

MHD
LBM
channel flow
nanoliquids
entropy generation
Brownian motion

Opis:

The present study deals with fluid flow, heat transfer and entropy generation in a two-dimensional channel filled with Cu–water nanoliquid and containing a hot block. The nanoliquid flow is driven along the channel by a constant velocity and a cold temperature at the inlet, and the partially heated horizontal walls. The aim of this work is to study the influence of the most important parameters such as nanoparticle volume fraction (0%≤ϕ≤4%), nanoparticle diameter (5 nm≤dp≤55 nm), Reynolds number (50≤Re≤200), Hartmann number (0≤Ha≤90), magnetic field inclination angle (0≤γ≤π) and Brownian motion on the hydrodynamic and thermal characteristics and entropy generation. We used the lattice Boltzmann method (LBM: SRT-BGK model) to solve the continuity, momentum and energy equations. The obtained results show that the maximum value of the average Nusselt number is found for case (3) when the hot block is placed between the two hot walls. The minimum value is calculated for case (2) when the hot block is placed between the two insulated walls. The increase in Reynolds and Hartmann numbers enhances the heat transfer and the total entropy generation. In addition, the nanoparticle diameter increase reduces the heat transfer and the irreversibility, the impact of the magnetic field inclination angle on the heat transfer and the total entropy generation is investigated, and the Brownian motion enhances the heat transfer and the total entropy generation.

Źródło:

Acta Mechanica et Automatica; 2022, 16, 4; 417--431
1898-4088
2300-5319

Pojawia się w:

Acta Mechanica et Automatica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

Dynamics of Trade Openness in Sri Lanka

Autorzy:

Mohamed Aslam, A. L.

Powiązania:

https://bibliotekanauki.pl/articles/1178315.pdf

Data publikacji:

2017

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Gross Domestic Product
Money supply
Sri Lanka
Trade openness

Opis:

In Sri Lanka, even it was verbally confirmed that the trade openness occurs the wonder on the economy of Sri Lanka, which was not statistically proofed. This study was to test the trade openness dynamics of the economic growth in Sri Lanka using annual time series data over the period of 1975 to 2014. In this study the following variables were used as variables gross domestic product, which was the proxy variable of the economic growth, the trade openness and the money supply. Furthermore, in order to test the long run relationship between the variables, the Johansen cointegration technique was employed while, the VECM technique was employed to test the short run behaviour of the trade openness. In this study, both techniques confirmed that the trade openness negatively and significantly had the long run relationship with the economic growth. While, the lag values of the trade openness in short run period, jointly had not impacted on the economic growth over the sample period. Finally, this study recommended to the government of Sri Lanka that the export should be increased when they formulate the trade development policy.

Źródło:

World Scientific News; 2017, 81, 2; 94-105
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

The history of genome mapping in Fragaria spp.

Autorzy:

Mohamed, A.-R. M. A.-W.
Jecz, T.
Korbin, M.

Powiązania:

https://bibliotekanauki.pl/articles/2139.pdf

Data publikacji:

2014

Wydawca:

Instytut Ogrodnictwa

Tematy:

woodland
strawberry
genome mapping
Fragaria vesca
mapping population
linkage
physical mapping
disease resistance
fruit colour
photoperiodic flower

Źródło:

Journal of Horticultural Research; 2014, 22, 2
2300-5009

Pojawia się w:

Journal of Horticultural Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

Potential Application of Used Coffee Grounds in Leather Tanning

Autorzy:

Nasr, Ahmed I.
El Shaer, Mohammed A.
Abd-Elraheem, Mohamed A.

Powiązania:

https://bibliotekanauki.pl/articles/24201785.pdf

Data publikacji:

2023

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

leather properties
tannins
vegetable tanning

Opis:

Safety of environment and human health is an essential requirement of modern industrial techniques. Therefore, using natural agents in tanning industry may emerge as a trusted method to avoid the chemical contamination caused by using traditional chromium salts in tanning process. This study aimed to evaluate the hot water extract of used coffee grounds (UCGs) as a vegetable tanning agent. The collected UCGs were dried and extracted with hot water at 90 °C for 2h. The phytochemical screening properties of UCGs extract were determined. Sufficient amount of extract was prepared to be used in leather tanning. Three groups were tanned with UCGs extract solely at concentrations of 20, 30 or 40% of pelts’ weight, while another three groups were tanned with the same concentrations and then re-tanned with 10% of a synthetic tanning agent “Phenol sulfonates”. On tanned leathers, organoleptic, physical and chemical properties were determined; scanning electron micrographs were depicted to examine the leather surface and collagen fiber bundles. Analysis of UCGs extract revealed that it has good tanning properties, as it contained tannins (14.92%), tannins/non tannins ratio (2.06), hide powder (39.57) and Stiasny number (21.16). The results of leather properties showed that using UCGs extract alone at concentration of 40% achieved the best results for the vegetable tanning where the tanned leather had higher (P<0.05) tensile strength, tearing strength and shrinking temperature than that treated with the lower level of 20% UCGs extract. However, 40% of UCGs extract is highly recommended to be used to accomplish the required shrinkage temperature that should be ≥ 70 °C. UCGs extract could be successfully used as tanning agent in vegetable tanning to produce durable leathers with good fullness; it may be used for different manufacturing products, such as footwear and bags. Moreover, using a combination of UCGs extract at any of the used concentrations with phenol sulfonates 10% led to significant improvement in all studied traits as compared with using UCGs extract alone.

Źródło:

Journal of Ecological Engineering; 2023, 24, 3; 10--19
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

Impact of cationic-anionic surfactants on selective oil agglomeration of oil shale

Autorzy:

Abdel-Khalek, Mohamed A.
Amin, Rasha
Hassan, El-Sayed R. E.

Powiązania:

https://bibliotekanauki.pl/articles/1450561.pdf

Data publikacji:

2020

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

oil shale
oil agglomeration
kerogen
surfactants
zeta potential

Opis:

Egyptian oil shale from Red Sea area is upgraded via oil agglomeration technique to achieve a clean fuel. A representative sample is characterized to identify its undesirable components and its liberation size. The quartz, apatite, calcite, siderite and anhydrite are the main gangue minerals. The sample was pulverized to less than 20 µm for efficient liberation. The impact of anionic (Calcium dodecyl benzene sulfonate, CDBS) or/and cationic (Cetrimonium bromide, CTAB) surfactants on the zeta-potential and agglomeration process was investigated in presence of different kerosene concentrations. A concentrate of 62% kerogen with 95% recovery was obtained from feed of 29% kerogen using 0.1% CTAB/CDBS mixture in 2% kerosene emulsion.

Źródło:

Physicochemical Problems of Mineral Processing; 2020, 56, 6; 137-144
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

First report on Noctiluca scintillans blooms in the Red Sea off the coasts of Saudi Arabia: consequences of eutrophication

Autorzy:

Mohamed, Z.A.
Mesaad, I.

Powiązania:

https://bibliotekanauki.pl/articles/48017.pdf

Data publikacji:

2007

Wydawca:

Polska Akademia Nauk. Instytut Oceanologii PAN

Tematy:

microalga
dinoflagellate
bloom
coast
eutrophication
Saudi Arabia
Red Sea
Noctiluca scintillans

Opis:

Blooms of Noctiluca scintillans are reported for the first time in the Red Sea off the south-western coasts of Saudi Arabia. During the present study, surface water samples were collected weekly on the coasts of the Al Shuqayq region from February to April 2004–2006. The abundance of N. scintillans correlated negatively with most nutrients, as well as the cell densities of diatoms and dinoflagellate species. Microscopic examination of live cells from Noctiluca blooms showed the presence of some species of diatoms and dinoflagellates within the Noctiluca body – confirmation of its grazing on these microalgae. The presence of a Noctiluca bloom in the coastal waters off south-western Saudi Arabia could be linked indirectly to water eutrophication by an increase in prey abundance. The physico-chemical properties of Red Sea coastal waters should therefore be monitored regularly in order to minimize the formation of harmful algal blooms, which may affect all food web levels, including the human level.

Źródło:

Oceanologia; 2007, 49, 3
0078-3234

Pojawia się w:

Oceanologia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

Molecular diversity of two-spotted spider mite (Tetranychus urticae) in apple orchards across Poland and its potential link with the resistance to METI-acaricides

Autorzy:

Jecz, T.
Korbin, M.
Gorzka, D.
Mohamed, A.-R.A.
Olszak, R.

Powiązania:

https://bibliotekanauki.pl/articles/1853.pdf

Data publikacji:

2018

Wydawca:

Instytut Ogrodnictwa

Tematy:

molecular diversity
two-spotted spider mite
Tetranychus urticae
apple orchard
Polska
acaricide resistance
pesticide
random amplified polymorphic DNA
acaricide
bioassay

Źródło:

Journal of Horticultural Research; 2018, 26, 2
2300-5009

Pojawia się w:

Journal of Horticultural Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

Exploitation of industrial solid wastes for preparing zeolite as a value-added product and its kinetics as adsorbent for heavy metal ions

Autorzy:

Abdel-Hameed, Reham Mohamed
Abdel-Aal, Elsayed A.
Farghaly, Fatma E.
Ibrahim, Ibrahim A.
Abdel Khalek, Mohamed A.
Ahmed, Mohamed A.
Abdel-Messih, Micheal F.

Powiązania:

https://bibliotekanauki.pl/articles/1448799.pdf

Data publikacji:

2021

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

zeolite P
aluminium wastes
hydrothermal process
metal ion removal
aluminum waste

Opis:

Aluminum and fumed silica as solid industrial wastes were converted to zeolite NaPas a value-addedproduct without any template. The hydrothermal process was optimized using static autoclave. The crystallization was carried out at 100, 120 and 150°C for 24, 48 and 72 h. The prepared zeolite of Si:Al ratio of 1.2 was characterized using X-ray Diffraction (XRD), Scanning Electron Microscope (SEM) provided with Energy Dispersive Spectroscopy (EDS), Surface Area, Fourier Transmitted Infra-Red (FTIR) and Thermal Analysis (TG-DSC). The crystalline phase was formed at 100°Cafter 72 hours and at 120°C after 48 hours, while it was formed after 24 honlyat 150°C. Increasing temperature and time lead to the conversion of the prismatic gibbsite crystals into plate-like structure of zeolitewhich is then formedcauliflower-like structure.The prepared zeolite was employed as adsorbent for $Ni^{2+}$ and $Cu2+ions from aqueous solution.The kinetic studies of adsorption processes were performed.

Źródło:

Physicochemical Problems of Mineral Processing; 2021, 57, 1; 87-99
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Field and modelling study for deficit irrigation strategy on roots volume and water productivity of wheat

Autorzy:

Abdelraouf, Ramadan E.
El-Shawadfy, Mohamed A.
Dewedar, Osama M.
Hozayn, Mahmoud

Powiązania:

https://bibliotekanauki.pl/articles/1844310.pdf

Data publikacji:

2021

Wydawca:

Instytut Technologiczno-Przyrodniczy

Tematy:

irrigation
roots volume
SALTMED model
soil moisture
water productivity
wheat

Opis:

In many regions of the world, including Egypt, water shortages threaten food production. An irrigation deficient strategy in dry areas has been widely investigated as a valuable and sustainable approach to production. In this study, the dry matter and grain yield of wheat was decreased by reducing the amount of irrigation water as well as the volume of the root system. As a result of this, there was an increase the soil moisture stress. This negatively affected the absorption of water and nutrients in the root zone of wheat plants, which ultimately had an effect on the dry matter and grain yield of wheat. The values of dry matter and grain yield of wheat increased with the ʻSakha 94ʼ variety compared to the ʻSakha 93ʼ class. It is possible that this was due to the increase in the genetic characteristic of the root size with the ʻSakha 94ʼ variety compared to the ʻSakha 93ʼ class, as this increase led to the absorption of water and nutrients from a larger volume of root spread. Despite being able to increase the water productivity of wheat by decreasing the amount of added irrigation water, the two highest grain yield values were achieved when adding 100% and 80% of irrigation requirements (IR) needed to irrigate the wheat and no significant differences between the yield values at 100% and 80% of IR were found. Therefore, in accordance with this study, the recommended irrigation for wheat is at 80% IR which will provide 20% IR. When comparing the water productivity of two wheat varieties in study, it becomes clear that ʻSakha 94ʼ was superior to ʻSakha 93ʼ when adding the same amount of irrigation water, and this resulted in increased wheat productivity for ʻSakha 94ʼ. The SALTMED results confirmed good accuracy (R2: 0.92 to 0.98) in simulating soil moisture, roots volume, water application efficiency, dry matter, and grain yield for two varieties of wheat under deficit irrigation conditions. Whilst using sprinkler irrigation system under sandy soils in Egypt.

Źródło:

Journal of Water and Land Development; 2021, 49; 129-138
1429-7426
2083-4535

Pojawia się w:

Journal of Water and Land Development

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

Minimizing of tunneling effect on existing infrastructure in Egypt

Autorzy:

Asker, Kamel I.
Fouad, Mohamed T.
Bahr, Mohamed A.
El-Attar, Ahmed N.

Powiązania:

https://bibliotekanauki.pl/articles/35525187.pdf

Data publikacji:

2021

Wydawca:

Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie

Tematy:

tunneling
grouting
field measurements
Abaqus
Al-Azhar twin tunnel

Opis:

A set of parametric studies by using the Abaqus software is conducting to investigate the effective method to seal the CWO sewer from the tunneling process. These methods include: (i) two deep grouted walls, (ii) adjacent slurry piles, (iii) bored reinforced concrete piles assisted with slurry piles, and (iv) grouted block confining the twin tunnel wall. Based on the results of parametric studies. Most of the protective studied technique was effective on reducing the tunneling effect on the ground movements.

Źródło:

Scientific Review Engineering and Environmental Sciences; 2021, 30, 1; 3-15
1732-9353

Pojawia się w:

Scientific Review Engineering and Environmental Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

English phonological errors by Kimakunduchi speaking EFL learners in Zanzibar

Autorzy:

Mohamed, Salim A.
Msuya, Erasmus A.

Powiązania:

https://bibliotekanauki.pl/articles/2082782.pdf

Data publikacji:

2020-12-13

Wydawca:

Uniwersytet Warszawski. Wydział Orientalistyczny. Katedra Języków i Kultur Afryki

Tematy:

consonants
foreign language
interlanguage
Kimakunduchi
language errors

Opis:

The aim of the present study was to find the phonological errors on segmental level involving selected consonant sounds which are produced by Kimakunduchi speaking English as Foreign Language (EFL) learners in Zanzibar. Specifically, the study sought to provide the evidence of cross-linguistic influence involving phonological transfer on segmental level. The study employed two sampling techniques: stratified and random sampling. The data for this study were collected from three secondary schools located at Makunduchi district in Unguja Island – Makunduchi, Kusini, and Kizimkazi secondary schools – using the oral interview and observation. The data were analyzed with the use of both qualitative and quantitative research approach. The study was guided by the transfer theory which was one of the components of Selinker’s (1992: 209) interlanguage theory. The findings revealed that, to a large extent, native Kimakunduchi speakers of EFL tended to transfer the sounds existing in their L1, or even in Kiswahili, into English. The transfer was done because of the nonexistence of the particular sound in the students’ native language or because of the discrepancy of spelling and pronunciation in English language. The study concludes that an articulation of vowels is more complex compared to consonants because of their absence in the first language (L1) or because of the confusion of spelling and pronunciation in English as FL. Thus, the study recommended that serious measures should be taken from both education holders to make sure that the learners could be able to pronounce English phonemes/words correctly.

Źródło:

Studies in African Languages and Cultures; 2020, 54; 121-141
2545-2134
2657-4187

Pojawia się w:

Studies in African Languages and Cultures

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Description of Triangulamyxa psittaca sp. n. (Myxozoa: Myxosporea), a new parasite in the urinary bladder of Colomesus psittacus (Teleostei) from the Amazon River, with emphasis on the ultrastructure of plasmodial stages

Autorzy:

Rocha, Sónia
Casal, Graça
Matos, Patrícia
Matos, Edilson
Dkhil, Mohamed A.
AZEVEDO, Carlos

Powiązania:

https://bibliotekanauki.pl/articles/763644.pdf

Data publikacji:

2011

Wydawca:

Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego

Tematy:

Ultrastructure, plasmodia, myxosporean, Triangulamyxa psittaca sp. nov., parasite, urinary bladder, freshwater fish, Colomesus psittacus

Opis:

A fish-infecting myxosporean was found in the urinary bladder of the teleostean Colomesus psittacus, collected from the Amazon River, Brazil. Specimens were sampled in three different periods: May and June, with water temperature ranging from 18–23ºC; August, with water temperature ranging from 24–28ºC; and November and December, with water temperature ranging from 29–32ºC. Upon observation, several fish displayed abnormal behaviour, consisting of erratic movements, and mortality was recorded among them. Necropsy of all sampled fishes revealed hypertrophy of the urinary bladder only among specimens previously displaying the irregular behaviour. Microscopic analysis of this organ confirmed the parasitic infection, resulting in the observation of spores floating free in the urine, and numerous plasmodia attached to the epithelium of the urinary bladder. Light and ultrastructural studies allowed recognition of the spores and plasmodia morphological characteristics. Coelozoic plasmodia were polysporic with varying organizational structure, according to the sampling period. Spores were equilaterally triangular with rounded ends in valvar view, measuring 8.8 ± 0.4 μm (n = 30) in length and 8.4 ± 0.5 μm (n = 30) in width, and displaying a ridge surface pattern. Two polar capsules were observed in the anterior end of the spores, measuring 3.1–3.2 μm in diameter. The spores were morphologically identified as belonging to the recently described genus Triangulamyxa. Further observation and comparison to the morphological features described for Triangulamyxa amazonica, the only other species within this genus, allowed us to conclude our parasite as a new species, herein named Triangulamyxa psittaca sp. nov. from the Amazon River, Brazil. Also, three different stages were distinguished in the plasmodium evolution, based on the observed morphological features at the three sampling periods. Fish sampled during May and June displayed small plasmodia (up to ~ 15–20 μm long), containing early stages of sporogenic development. Fish sampled during November and December presented larger plasmodia (up to ~ 850 μm long), which appeared flattened against and lining the urinary bladder epithelial cells and contained the later stages of sporogenic development, including some mature spores. Fish sampled during August presented plasmodia displaying intermediate morphological features between those observed in infected fish from the other sampling periods. Several immature and mature spores were among the different developmental stages. The parasite-host interface evolution is described throughout the different observed stages, with emphasis on the formation of septate junctions. Considering several previous reports, as well as the different environmental conditions during the sampling periods, the plasmodium development here described appears to be influenced by environmental factors, namely water temperature.

Źródło:

Acta Protozoologica; 2011, 50, 4
1689-0027

Pojawia się w:

Acta Protozoologica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Efficient H.264 Intra Frame CODEC with Best Prediction Matrix Mode Algorithm

Autorzy:

Hamdy, Sara
Zekry, Abdelhalim
Mohamed, Wael A.

Powiązania:

https://bibliotekanauki.pl/articles/226164.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

best prediction matrix mode (BPMM)
compression efficiency
H.264/AVC
Huffman coding
Intra prediction

Opis:

The continuous growth of smart communities and ever-increasing demand of sending or storing videos, have led to consumption of huge amount of data. The video compression techniques are solving this emerging challenge. However, H.264 standard can be considered most notable, and it has proven to meet problematic requirements. The authors present (BPMM) as a novel efficient Intra prediction scheme. We can say that the creation of our proposed technique was in a phased manner; it's emerged as a proposal and achieved impressive results in the performance parameters as compression ratios, bit rates, and PSNR. Then in the second stage, we solved the challenges of overcoming the obstacle of encoding bits overhead. In this research, we try to address the final phase of the (BPMM) codec and to introduce our approach in a global manner through realization of decoding mechanism. For evaluation of our scheme, we utilized VHDL as a platform. Final results have proven our success to pass bottleneck of this phase, since the decoded videos have the same PSNR that our encoder tells us, while preserving steady compression ratio treating the overhead. We aspire our BPMM algorithm will be adopted as reference design of H.264 in the ITU.

Źródło:

International Journal of Electronics and Telecommunications; 2020, 66, 3; 571-582
2300-1933

Pojawia się w:

International Journal of Electronics and Telecommunications

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

Occurrence and germination of dinoflagellate cysts in surface sediments from the Red Sea off the coasts of Saudi Arabia

Autorzy:

Mohamed, Z.A.
Al-Shehri, A.M.

Powiązania:

https://bibliotekanauki.pl/articles/48723.pdf

Data publikacji:

2011

Wydawca:

Polska Akademia Nauk. Instytut Oceanologii PAN

Tematy:

occurrence
germination
dinoflagellate cyst
cyst
Red Sea
Saudi Arabia
coast
toxic species
distribution
abundance
surface sediment
organic carbon
silt
clay
Cochlodinium polykrikos
Prorocentrum minimum
Dinophysis
acuminata
Alexandrium catenell
Scrippsiella trochoidea

Opis:

The distribution and abundance of dinoflagellate cyst assemblages were investigated in surface sediments from south-western Red sea coasts of Saudi Arabia at six sites during March 2010. A total of 19 taxa of dinoflagellate cysts were identified from all sites. The sampling sites showed a similar cyst assemblage, but they differed in total cyst abundance (3 to 4083 cysts g−1 dry weight). Cyst abundance was strongly correlated with sediment characteristics, the highest numbers being recorded in sediments with large contents of organic carbon, silt and clay. Cyst assemblages were dominated by cysts of potentially toxic species, including Cochlodinium polykrikos, Prorocentrum minimum, Dinophysis acuminata, Alexandrium catenella and Scrippsiella trochoidea. Most cysts germinated successfully at different rates at 15 and 25◦C. This study suggests that surface sediments from all Saudi Red Sea coasts should be monitored for the presence of dinoflagellate cysts to give ample warning of the presence and abundance of toxic species in a given area.

Źródło:

Oceanologia; 2011, 53, 1
0078-3234

Pojawia się w:

Oceanologia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

The link between shrimp farm runoff and blooms of toxic Heterosigma akashiwo in Red Sea coastal waters

Autorzy:

Mohamed, Z.A.
Al-Shehri, A.M.

Powiązania:

https://bibliotekanauki.pl/articles/48811.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Instytut Oceanologii PAN

Tematy:

hemolytic activity
ichthyotoxic alga
shrimp farm
raphidophyte
Heterosigma akashiwo
Red Sea
coastal water
Saudi Arabia
phytoplankton
physicochemical characteristics
sea water
environmental factor
nutrient concentration
algal bloom

Opis:

In May 2010 a copious bloom of the raphidophyte Heterosigma akashiwo was observed for the first time in Red Sea waters off the coasts of Saudi Arabia. This bloom was confined to an area where water and phytoplankton flow freely between the sea and a shrimp farm. The phytoplankton density and physico-chemical characteristics of the sea water were therefore investigated weekly at bloom and non-bloom sites in order to gain insight into the environmental factors prevailing at the bloom site and their link with the shrimp farm runoff. The bloom site showed higher nutrient concentrations than the non-bloom site, indicating the possible role of the shrimp farm in flushing nutrients into this site. The bloom appeared on 27 May, coinciding with a decrease in salinity (<300/00) and an increase in temperature (>19◦C). The results of toxicological assays showed that both bloom samples and batch cultures of H. akashiwo were toxic to Artemia salina and exhibited haemolytic activity with respect to rabbit erythrocytes. Bloom samples showed a higher toxicity (LC50 = 8.9 × 104 cells ml−1) and haemolytic activity (EC50 = 3.64 × 104 cells ml−1) than the batch cultures (LC50 =11.6×104 cells ml−1, EC50 =5.1×104 cells ml−1). In the light of the results of this study, the link between H. akashiwo blooms and shrimp farm runoff should be considered during the monitoring of Red Sea coastal waters for the presence of harmful algal blooms.

Źródło:

Oceanologia; 2012, 54, 2
0078-3234

Pojawia się w:

Oceanologia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

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

/5

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Skocz do pozycji: 28.

Tytuł:

SYNTHESIS, AND EVALUATION OF COUMARIN HYBRIDS AS ANTIMYCOBACTERIAL AGENTS

Autorzy:

Hassan, Mohd Z.
ALSAYARI, ABDULRHMAN
OSMAN, HASNAH
ALI, MOHAMED A.
MUHSINAH, ABDULLATIF B.
AHSAN, MOHAMED J.

Powiązania:

https://bibliotekanauki.pl/articles/895509.pdf

Data publikacji:

2019-12-29

Wydawca:

Polskie Towarzystwo Farmaceutyczne

Tematy:

cytotoxicity
Coumarin
TB
Thiazolopyrimidine
HTS
antimycobacterial

Opis:

A series of twelve hybrid coumarin analogues were synthesized and screened through HTS for their antimycobacterial activity against Mtb H37Rv. The hybrid molecules were efficiently synthesized by the reactions of 3-(bromoacetyl)coumarin with Biginelli products 2-mercapto-6-oxo-4-aryl-1,6-dihydropyrimidine-5-carbonitriles. Of the resulting twelve hybrids, the two compounds 7-(2,4-dichlorophenyl)-5-oxo-3-(2-oxo-2H-chromen-3-yl)-5H-thiazolo[3,2-a] pyrimidine-6-carbonitrile (3d) and 7-(4-nitrophenyl)-5-oxo-3-(2-oxo-2H-chromen-3-yl)-5H-thiazolo[3,2-a]pyrimidine-6-carbonitrile (3f) showed excellent antimycobacterial activity against Mtb (EC50 3.19 & 7.91 µM, respectively) and low cytotoxicity against the VERO cell line (IC50 > 62.5 µg/mL).

Źródło:

Acta Poloniae Pharmaceutica - Drug Research; 2019, 76, 6; 1029-1036
0001-6837
2353-5288

Pojawia się w:

Acta Poloniae Pharmaceutica - Drug Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

Assessment of Lower Zab river water quality using both Canadian Water Quality Index Method and NSF Water Quality Index Method

Autorzy:

Ahmed, Sarah M.
Taha, Omer M.E.
Najemalden, Mohamed A.
Ahmed, Rehab T.
Abedulwahab, Ali A.

Powiązania:

https://bibliotekanauki.pl/articles/118599.pdf

Data publikacji:

2020

Wydawca:

Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie

Tematy:

NSF Water Quality Index
Canadian Water Quality Index
Lower Zab river
physicochemical parameters
dissolved oxygen
biochemical oxygen demand

Opis:

Rivers are considered the most important sources of surface water on Earth. They are play a significant role in all human activities and the quality of river water is needed. Therefore, the importance of the water quality index is arising through providing data base about quality of the water source, and explain the change in the water quality over a period of time continually. This study involved determination of physicochemical and biological parameters of Lower Zab river in Kirkuk city at two different points. The objectives of the study are to assess the present water quality, through analysis of some selected water quality parameters like pH, TDS, BOD, dissolved oxygen, turbidity, EC, alkalinity, and salinity etc. and to compare the results with the Canadian Council of Ministers of the Environment and National Sanitation Foundation Water Quality Indices. Raw water samples were collected from the Lower Zab river twice a month by one sample every 15 days from each station. The water quality data include 16 different parameters. Tests were carried out following the American Public Health Association standard methods. The results show that all parameters values were within the standards of drinking water proposed by the CCME standards and Iraqi standards or the World Health Organization standards for drinking purpose, except turbidity, DO, nitrate, calcium, which were mostly higher than the standards and sometimes BOD and potassium. The results of WQI showed that the water quality at LZ3 station is lower than LZ2 station due to the polluting activity of the Lower Zab river. Furthermore, for the years 2014, 2015, and 2016, the water quality was degraded due to the ISIS war. Also, it was noted in the 2013 year that the water quality degraded more in fall and winter seasons due to that the earth has exposed to the long-dried season and then suddenly exposed to a high rainfall season which in turns leads to increase some parameters very high (i.e. turbidity). Finally, the Lower Zab river water cannot be use for drinking directly. However, a pretreatment is needed before the drinking use.

Źródło:

Scientific Review Engineering and Environmental Sciences; 2020, 29, 2; 155-171
1732-9353

Pojawia się w:

Scientific Review Engineering and Environmental Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

Perkinsus sp. (Alveolata, Perkinsidae) a Parasite of the Clam Meretrix meretrix (Veneridae) from Arabian Gulf: Ultrastructural Observations of the Trophozoites and the Cellular Response of the Host

Autorzy:

ABDEL-BAKI, Abdel-Azeem S.
AL-QURAISHY, Saleh
Dkhil, Mohamed A.
OLIVEIRA, Elsa
Casal, Graça
AZEVEDO, Carlos

Powiązania:

https://bibliotekanauki.pl/articles/763467.pdf

Data publikacji:

2014

Wydawca:

Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego

Tematy:

Perkinsus, trophozoite, encapsulation, ultrastructure, clam, Meretrix meretrix, Arabian Gulf

Opis:

Genus Perkinsus Levine, 1978 (Alveolata, Perkinsidae) an intracellular pathogenic parasite is described from the mantle and gill filaments of a commercially important clam, Meretrix meretrix, collected from the Arabian Gulf, Saudi Arabia. This genus contains currently seven named species: P. marinus, P. olseni (P. atlanticus), P. chesapeaki (P. andrewsi), P. mediterraneus, P. honshuensis, P. beihaiensis and P. qugwadi. Meanwhile, some unnamed Perkinsus sp. have been described in wide variety of mollusc species. Ultrastructural features of Perkinsus sp. trophozites and the host reaction are described. The different developmental stages of trophozoites appeared as single or grouped cells surrounded by amorphous material that constituted cysts or nodules randomly distributed throughout the connective tissue of the mantle. The early trophozoites were generally spherical to ellipsoidal with a circular nucleus containing a prominent central nucleolus. The cytoplasm had several small vacuoles which coalesce to form a great vacuole in the later trophozoites and the nucleus becomes eccentric. Some lomosomes were observed between the wall and the plasmalemma of trophozoites. A large number of degraded and pyknotic cell and several cellular structure with lysed aspects were encountered in the surrounding area near the cysts. Ultrastructural data showed that the lysed granular cells and the coalescence of the granules result in the cyst that encapsulates various trophozoites. In the current study, we describe for the first time the presence of Perkinsus sp. as well as the host reaction in clams from the Saudi Arabian coasts.

Źródło:

Acta Protozoologica; 2014, 53, 2
1689-0027

Pojawia się w:

Acta Protozoologica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

Deep Learning Can Improve Early Skin Cancer Detection

Autorzy:

Mohamed, Abeer
Mohamed, Wael A.
Zekry, Abdel Halim

Powiązania:

https://bibliotekanauki.pl/articles/963798.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

technology
dermoscopic lesions
convolutional
neural network
ISIC dataset
deep learning
neural networks

Opis:

Skin cancer is the most common form of cancer affecting humans. Melanoma is the most dangerous type of skin cancer; and early diagnosis is extremely vital in curing the disease. So far, the human knowledge in this field is very limited, thus, developing a mechanism capable of identifying the disease early on can save lives, reduce intervention and cut unnecessary costs. In this paper, the researchers developed a new learning technique to classify skin lesions, with the purpose of observing and identifying the presence of melanoma. This new technique is based on a convolutional neural network solution with multiple configurations; where the researchers employed an International Skin Imaging Collaboration (ISIC) dataset. Optimal results are achieved through a convolutional neural network composed of 14 layers. This proposed system can successfully and reliably predict the correct classification of dermoscopic lesions with 97.78% accuracy.

Źródło:

International Journal of Electronics and Telecommunications; 2019, 65, 3; 507-512
2300-1933

Pojawia się w:

International Journal of Electronics and Telecommunications

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

Skin Lesion Analysis Toward Melanoma Detection Using Deep Learning Techniques

Autorzy:

Sherif, Fatma
Mohamed, Wael A.
Mohra, A.S.

Powiązania:

https://bibliotekanauki.pl/articles/226719.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

melanoma
skin cancer
convolutional neural network
deep learning

Opis:

In the last few years, a great attention was paid to the deep learning Techniques used for image analysis because of their ability to use machine learning techniques to transform input data into high level presentation. For the sake of accurate diagnosis, the medical field has a steadily growing interest in such technology especially in the diagnosis of melanoma. These deep learning networks work through making coarse segmentation, conventional filters and pooling layers. However, this segmentation of the skin lesions results in image of lower resolution than the original skin image. In this paper, we present deep learning based approaches to solve the problems in skin lesion analysis using a dermoscopic image containing skin tumor. The proposed models are trained and evaluated on standard benchmark datasets from the International Skin Imaging Collaboration (ISIC) 2018 Challenge. The proposed method achieves an accuracy of 96.67% for the validation set. The experimental tests carried out on a clinical dataset show that the classification performance using deep learning-based features performs better than the state-of-the-art techniques.

Źródło:

International Journal of Electronics and Telecommunications; 2019, 65, 4; 597-602
2300-1933

Pojawia się w:

International Journal of Electronics and Telecommunications

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

Seed Quality and Protein Classification of Some Quinoa Varieties

Autorzy:

Abd El-Hakim, Ahmed F.
Mady, Emad
Abou Tahoun, Ayman M.
Ghaly, Mohammed S. A.
Eissa, Mohamed A.

Powiązania:

https://bibliotekanauki.pl/articles/2025743.pdf

Data publikacji:

2021

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

quinoa
seed vigour
seed quality
amino acids composition
agro-climatic zone

Opis:

Quinoa plants, originating from the Andean mountains in South America, have a large scale of biological diversity. Along with the cultivation favorableness of quinoa, it reveals superior nutrition aspects. In comparison with cereal crops, like rice, maize, and wheat, quinoa seeds contain valuable quantities of protein of remarkable quality. The current study compared four quinoa cultivars from different origins in terms of protein composition and germinability. In addition, this study focused on the effect of different geographical cultivation areas on the protein composition of wild Egyptian quinoa seeds and three other cultivars that vary in their cultivation origins. Significant differences were observed among the quinoa varieties in the germination percentage (GP), shoot length (SL), and root length (RL). Using the technology of Near-InfraRed Spectroscopy, the highest protein value was recorded for the American variety (18.39%), followed by the Wild Egyptian variety (17.16%). The aromatic phenylalanine recorded the highest concentration of the essential amino acid bulk. The Rainbow variety contained 12.7 g-aa/kg protein, followed by the wild Egyptian variety with 4.9 g-aa/kg protein. In turn, glutamic was the most abundant amino acid of the non-essential amino acids, with 10.1, 4, 23.4, and 4 (g-aa/kg protein) for quinoa varieties, Wild Egyptian, American, Rainbow, Black, respectively. SDS-PAGE was used to identify the allelic variations in the seed storage protein profiles among the studied quinoa varieties. The studied quinoa varieties showed 23.81% of the polymorphism in the protein bands, with the mean band frequency of 0.881. The resulting protein bands fluctuated in the range between 115.02 and 16 kDa. With a similarity percentage (90%), Wild Egyptian and the Rainbow quinoa varieties can be classified in one clade.

Źródło:

Journal of Ecological Engineering; 2022, 23, 1; 24-33
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

Reliability analysis and prediction for time to failure distribution of an automobile crankshaft
Analiza niezawodności i przewidywanie rozkładu czasu do uszkodzenia wału korbowego pojazdu samochodowego

Autorzy:

Singh, S. S. K.
Abdullah, S.
Mohamed, N. A. N.

Powiązania:

https://bibliotekanauki.pl/articles/301436.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN

Tematy:

reliability
time to failure
monotonic function
hazard rate
niezawodność
czas do uszkodzenia
funkcja monotoniczna
wskaźnik zagrożenia

Opis:

This paper emphasizes on analysing and predicting the reliability of an automobile crankshaft by analysing the time to failure (TTF) through the parametric distribution function. The TTF was modelled to predict the likelihood of failure for crankshaft during its operational condition over a given time interval through the development of the stochastic algorithm. The developed stochastic algorithm has the capability to measure the parametric distribution function and validate the predict the reliability rate, mean time to failure and hazard rate. T, the algorithm has the capability to statistically validate the algorithm to obtain the optimal parametric model to represent the failure of the component against the actual time to failure data from the local automobile industry. Hence, the validated results showed that the three parameter Weibull distribution provided an accurate and efficient foundation in modelling the reliability rate when compared with the actual sampling data. The suggested parametric distribution function can be used to improve the design and the life cycle due to its capability in accelerating and decelerating the mechanism of failure based on time without adjusting the level of stress. Therefore, an understanding of the parametric distribution posed by the reliability and hazard rate onto the component can be used to improve the design and increase the life cycle based on the dependability of the component over a given period of time. The proposed reliability assessment through the developed stochastic algorithm provides an accurate, efficient, fast and cost effective reliability analysis in contrast to costly and lengthy experimental techniques.
W prezentowanej pracy przedstawiono metodę analizy oraz predykcji niezawodności wału korbowego pojazdu samochodowego opartą na analizie czasu do uszkodzenia (TTF) z wykorzystaniem funkcji rozkładu parametrycznego. W artykule, stworzono model TTF pozwalający na przewidywanie prawdopodobieństwa uszkodzenia wału korbowego w stanie pracy w danym przedziale czasu za pomocą nowo opracowanego algorytmu stochastycznego. Opracowany algorytm stochastyczny umożliwia mierzenie funkcji rozkładu parametrycznego oraz weryfikację przewidywanego współczynnika niezawodności, średniego czasu do uszkodzenia oraz współczynnika zagrożenia. Algorytm daje możliwość statystycznej weryfikacji modelu w odniesieniu do rzeczywistych danych dotyczących czasu do uszkodzenia pochodzących z lokalnego przemysłu samochodowego. Weryfikacja taka pozwala na otrzymanie optymalnego modelu parametrycznego reprezentującego uszkodzenie części składowej. Zweryfikowane wyniki wykazały, że trójparametrowy rozkład Weibulla stanowi dokładne i wydajne narzędzie do modelowania współczynnika niezawodności w zestawieniu z rzeczywistymi danymi z próby. Proponowaną dystrybuantę parametryczną można wykorzystywać do doskonalenia konstrukcji oraz cyklu życia wału korbowego ponieważ daje ona możliwość przyspieszania i zwalniania mechanizmu uszkodzenia, na podstawie czasu, bez potrzeby regulacji poziomu naprężenia. Zatem, znajomość rozkładu parametrycznego oraz obliczonych na jego podstawie współczynników niezawodności i zagrożenia omawianego elementu mechanizmu korbowego, pozwala na doskonalenie konstrukcji oraz wydłużenie cyklu życia wału korbowego w oparciu o dane dotyczące jego niezawodności w danym okresie czasu. Proponowana metoda oceny niezawodności z wykorzystaniem opracowanego w artykule algorytmu stochastycznego umożliwia dokładną, wydajną, szybką i tanią analizę niezawodności w odróżnieniu od kosztownych i czasochłonnych technik eksperymentalnych.

Źródło:

Eksploatacja i Niezawodność; 2015, 17, 3; 408-415
1507-2711

Pojawia się w:

Eksploatacja i Niezawodność

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

Refined multi-phase-lags theory and Thomson effect on a micropolar thermoelastic medium with voids

Autorzy:

Alharbi, Amnah M.
Abd-Elaziz, Elsayed M.
Othman, Mohamed I.A.

Powiązania:

https://bibliotekanauki.pl/articles/1955005.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

micropolar
voids
refined-phase-lags theory
thomson effect
normal mode
analysis

Opis:

The problem considered is that of an isotropic, micropolar thermoelastic medium with voids subjected to the Thomson effect. The solution to the problem is presented in the context of the refined multiphase-lags theory of thermoelasticity. The normal mode analysis was used to obtain the analytical expressions of the considered variables. The nondimensional displacement, temperature, microrotation, the change in the volume fraction field and stress of the material are obtained and illustrated graphically. The variations of these quantities have been depicted graphically in the refined-phase-lag theory, Green and Naghdi theory of type II, Lord and Shulman theory and a coupled theory. The effects of the Thomson parameter and phase lag parameters on a homogeneous, isotropic, micropolar thermoelastic material with voids are revealed and discussed. Some particular cases of interest are deduced from the present investigation.

Źródło:

Archives of Thermodynamics; 2021, 42, 3; 279--309
1231-0956
2083-6023

Pojawia się w:

Archives of Thermodynamics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

Use of plant growth-promoting rhizobacteria isolates as a potential biofertiliser for wheat

Autorzy:

Abdelazeem, Samy A.E.M
Al-Werwary, Samar M.
Mehana, Taha A.E.
El-Hamahmy, Mohamed A.
Kalaji, Hazem M.
Rastogi, Anshu
Elsheery, Nabil I.

Powiązania:

https://bibliotekanauki.pl/articles/2203577.pdf

Data publikacji:

2022

Wydawca:

Instytut Technologiczno-Przyrodniczy

Tematy:

nitrogen
phosphorous
plant growth promoting rhizobacteria
siderophores

Opis:

Plant growth-promoting rhizobacteria (PGPR) isolated from the rhizosphere soil of eight field crops at different locations in Egypt were identified. Rhizobacteria strains were identified as Bacillus endophyticus AW1 5, B. filamentosus EM9, ET3, Micrococcus luteus KT2, FW9, FC13, SaW4, Enterobacter cloacae SK18, Pseudomonas azotoformans TPo10, Citrobacter braakii TC3. All isolates solubilised insoluble phosphate and produced IAA, while only six were able to produce siderophores in vitro. Vegetative growth and yield of wheat cv. ‘Sakha 94’ were enhanced after the application of single inoculation of each isolate compared to the control. Grain yield was increased by 20.7-96.5% over the control according to bacterial isolates. Available phosphorus (P) and counts of total bacteria in soil were observed to be significantly increased in treatments than in control. After the wheat harvest, soil pH was observed to be decreased, and a highly significant negative correlation was observed between soil pH and the levels of available phosphorus. Significant increases in grain and straw yields, as well as uptake of nitrogen (N) and P by plants, were observed due to inoculation with PGPR isolates. Levels of photosynthetic pigments, free amino acids, free phenolics, and reducing sugars in flag leaf and spikes were significantly enhanced by the application of all PGPR isolates compared to the control. Thus this study identifies the PGPR isolates for the improvement of the growth, yield, and quality of wheat. The study may be also useful for field evaluation under different soils and environmental conditions before generalising PGPR isolates as biofertilisers.

Źródło:

Journal of Water and Land Development; 2022, Special Issue; 99--111
1429-7426
2083-4535

Pojawia się w:

Journal of Water and Land Development

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

Management of potato virus Y (PVY–NTN) causing potato tuber necrotic ringspot disease (PTNRD) in potato by prior treatment with a mild PVY strain

Autorzy:

Abdalla, O.A.
Eraky, A.I.
Mohamed, S.A.
Fahmy, F.G.

Powiązania:

https://bibliotekanauki.pl/articles/65943.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Egypt
pest management
potato virus Y
potato tuber
necrotic ringspot disease
potato
plant protection
mild strain
treatment

Opis:

Potato virus Y (PVY) is one of the most destructive viruses infecting potato in Egypt and worldwide. Recent research has shown that a necrotic PVY-NTN strain is infecting potato in Upper Egypt. Chemical control is not effective to control this viral pathogen. An alternative to control PVY infecting potato is using a mild PVY strain to elicit systemic cross protection in potato plants against infection with a severe necrotic strain of PVY. Results of this study showed that a PVY necrotic strain produced a significant lesser number of local lesions on diagnostic plants (Robinia pseudoacacia L.) when these plants were treated first with a mild PVY strain. Data obtained from greenhouse and field experiments indicated that treatment of potato plants (variety Burna) with a mild PVY strain significantly protected potato from infection with a severe necrotic PVY strain, and resulted in a significant increase in tuber yield compared with infected plants without prior treatment with a mild PVY strain. The highest increase in potato tuber yield was obtained when potato plants were inoculated with a mild PVY strain 3 days before challenging with the severe necrotic PVY strain. This study proved that using a mild strain of PVY can significantly protect potato plants from infection with a severe strain of this virus under both greenhouse and field conditions and can present a potential method to reduce losses due to infection of this virus in Assiut governorate and Upper Egypt.

Źródło:

Journal of Plant Protection Research; 2018, 58, 2
1427-4345

Pojawia się w:

Journal of Plant Protection Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Electron-transfer complexation of morpholine donor molecule with some π – acceptors: Synthesis and spectroscopic characterizations

Autorzy:

Al-Wasidi, Asma S.
Al-Jafshar, Nawal M.
Al-Anazi, Amal M.
Alosaimi, Eid H.
Refat, Moamen S.
El-Zayat, Lamia
Al-Omar, Mohamed A.
Naglah, Ahmed M.
El-Nour, K.M. Abou

Powiązania:

https://bibliotekanauki.pl/articles/778928.pdf

Data publikacji:

2019

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

Morpholine
π-acceptor
CT complex
photometric titration
infrared
Benesi-Hildebrand

Opis:

Morpholine is an interesting moiety that used widely in several organic syntheses. The intermolecular charge-transfer (CT) complexity associated between morpholine (Morp) donor with (monoiodobromide “IBr”, 2,3-dichloro-5,6-dicyano-1,4-benzoquinone “DDQ”, 2,6-dichloroquinone-4-chloroimide “DCQ” and 2,6-dibromoquinone-4-chloroimide “DBQ”) π–acceptors have been spectrophotometrically investigated in CHCl3 and/or MeOH solvents. The structures of the intermolecular charge-transfer (CT) were elucidated by spectroscopic methods like, infrared spectroscopy. Also, different analyses techniques such as UV-Vis and elemental analyses were performed to characterize the four morpholine [(Morp)(IBr)], [(Morp)(DDQ)], [(Morp)(DCQ)] and [(Morp)(DBQ)] CT-complexes which reveals that the stoichiometry of the reactions is 1:1. The modified Benesi-Hildebrand equation was utilized to determine the physical spectroscopic parameters such as association constant (K) and the molar extinction coefficient (ε).

Źródło:

Polish Journal of Chemical Technology; 2019, 21, 4; 82-88
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

Adjustment to target debt maturity and equity mispricing : evidence from Asia Pacific
Dostosowanie do docelowej wymagalności zadłużenia oraz nieprawidłowej wyceny wartości : dowody z Azji i Pacyfiku

Autorzy:

Hussain, H. I.
Hadi, A. R. A.
Mohamed-Isa, A.
Salem, M. A.
Kamarudin, F.
Jabarullah, N. H.

Powiązania:

https://bibliotekanauki.pl/articles/404704.pdf

Data publikacji:

2018

Wydawca:

Politechnika Częstochowska

Tematy:

debt maturity
target adjustment behavior
speed of adjustment
capital structure
Asia Pacific region
dojrzałość długu
zachowanie dostosowania celu
szybkość dostosowań
struktura kapitałowa
region Azji i Pacyfiku

Opis:

This paper examines firms’ target adjustment behavior for debt maturity structure for selected countries from the Asia Pacific region. The literature documents that managers’ structure debt issues in line with a target maturity structure which is limited by transactions costs, information asymmetry, agency problems, liquidity needs as well as institutional factors. Our paper contends that firms adjust to target levels at differing rates based on whether the current maturity structure is above or below target levels as well as equity mispricing. We estimate the target debt maturity based on the lead level and measure speed of adjustment to target levels by regressing the difference between the simulated and actual values. Our findings indicate that firms which are below target debt maturity tend to adjust at more rapid rates during periods of overvaluation. Firms which are above target debt maturity tend to adjust at more rapid rates during periods of undervaluation. Our findings indicate asymmetric adjustment rates indicating that debt maturity structure serves as an important tool for signaling. The implications provide a better understanding on the impact of debt maturity on information asymmetry leading to differences in adjustment to target debt maturity structures.
W niniejszym artykule przeanalizowano zachowanie firm w zakresie dostosowań docelowych dla struktury zapadalności długu dla wybranych krajów z regionu Azji i Pacyfiku. W literaturze udokumentowano, że struktura zarządzania zadłużeniem jest zgodna z docelową strukturą zapadalności, która jest ograniczona przez koszty transakcji, asymetrię informacji, problemy agencji, potrzeby płynności oraz czynniki instytucjonalne. Stwierdzono, że firmy dostosowują się do poziomów docelowych przy różnych stawkach w zależności od tego, czy obecna struktura zapadalności jest powyżej lub poniżej poziomu docelowego, jak również z powodu niewłaściwej wyceny kapitału własnego. Oszacowano docelowy termin zapadalności długu na podstawie poziomu wiodącego oraz zmierzono szybkość dostosowania do poziomów docelowych poprzez regresję różnicy między symulowanymi a rzeczywistymi wartościami. Wyniki wskazują, że firmy, które nie osiągają docelowego poziomu zadłużenia, mają tendencję do szybszego dostosowywania stawek w okresach przewartościowania. Firmy, które przekraczają docelowy poziom zadłużenia, mają tendencję do szybszego dostosowywania stawek w okresach niedowartościowania. Wyniki wskazują na asymetryczne wskaźniki korygowania, które wskazują, że struktura terminów zapadalności służy jako ważne narzędzie sygnalizacji. Implikacje te zapewniają lepsze zrozumienie wpływu dojrzałości długu na asymetrię informacyjną prowadzącą do różnic w dostosowaniu do docelowych struktur zapadalności długu.

Źródło:

Polish Journal of Management Studies; 2018, 17, 2; 87-100
2081-7452

Pojawia się w:

Polish Journal of Management Studies

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Preliminary statistical analysis of anthropometrics data in related to sitting posture among college students at east coast Malaysia

Autorzy:

Ibrahim, M.H.
Ishak, N.F.
Mukhtar, N.Z.
Basir, M.H.
Said, N.A.
Mohamed, K.A.
Awang, M.E.

Powiązania:

https://bibliotekanauki.pl/articles/24200579.pdf

Data publikacji:

2022

Wydawca:

Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach

Tematy:

sitting posture
anthropometric data
human health
pozycja siedząca
dane antropometryczne
zdrowie człowieka

Opis:

Purpose: To statistically analyse sitting posture using anthropometrics data among college students in Malaysia. Design/methodology/approach: This study was conducted among 52 college students consisting of males and females. Data were analysed using a common statistical tool which is the Statistical Package of Sosial Science (SPSS). Findings: Preliminary analysis of data indicated that there are wider differences in standard deviation of eye sitting height compared to the previous study conducted. Research limitations/implications: This study was conducted at only one higher learning institution/college located at East Cost of Malaysia. Practical implications: The larger value of standard deviation discovered as statistical analysis performed using combined data among male and female participants suggested that data should be segregated. Originality/value: Result obtained could be used as a preliminary guideline to design any related item in related to sitting posture.

Źródło:

Archives of Materials Science and Engineering; 2022, 116, 2; 81--85
1897-2764

Pojawia się w:

Archives of Materials Science and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Interest rate dynamics on savings: Evidence from Sri Lanka

Autorzy:

Aslam, A. L. Mohamed

Powiązania:

https://bibliotekanauki.pl/articles/1165693.pdf

Data publikacji:

2018

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Dynamics
Economists
Interest rate
Policymakers
Savings
Sri Lanka

Opis:

Economists believe the interest rate is an interim agent for savings, which promotes the people to lose their present consumption continuously. So, this study also assumed that there was a relationship between the interest rate and savings. Based on that, the objective of this study was to explore the interest rate dynamics on savings in Sri Lank over the period of 1977 to 2017. In this study annual time series data for the following variables: interest rate, savings, and gross domestic product were used, and the Johansen and Juselius cointegration technique was employed to test the cointegration relationship between the variables. In this study, interest rate was considered as key independent variable and savings was dependent variable. Both Augmented Dickey-Fuller (ADF) and Kwiatkowski – Phillips – Schmidt – Shin tests were employed to test the stationarity of the variables. In terms of these tests, all variable were stationary at first difference level. Furthermore, interest rate and savings had the long run relationship and there was short-run causality between interest rate and savings which was confirmed by the results of Vector Error Correction model (VECM). Therefore, the interest rate had long - run and short - run relationship on the savings in Sri Lanka. Finally, this study recommends the policy makers should consider interest rate friendly policy to boost the savings in Sri Lanka.

Źródło:

World Scientific News; 2018, 107; 224-232
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Impact of Exchange Rate on Economic Growth in Sri Lanka

Autorzy:

Aslam, A. L. Mohamed

Powiązania:

https://bibliotekanauki.pl/articles/1191250.pdf

Data publikacji:

2016

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Exchange rate
Economic growth
Interest rate
Colombo Consumer Price Index

Opis:

Exchange rate is identified as a factor for turning vector of the economic growth of countries which was empirically confirmed by several related studies. But in Sri Lankan context it was not confirmed. Therefore, the objective of this study was to test the impact of exchange rate on the economic growth in Sri Lanka. To achieve this objective, the annual time series data from 1970 to 2015 were used and the variables such as gross domestic product, exchange rate, inflation rate, and interest rate were considered and the multiple regressions model using Ordinary Least squared method was employed. Based on the outcome of the multiple regression model, this study confirmed that the exchange rate positively influenced on the economic growth in Sri Lanka at one percent significant level.

Źródło:

World Scientific News; 2016, 54; 252-266
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Budget Deficit and Economic Growth in Sri Lanka: An Econometric Dynamic Analysis

Autorzy:

Aslam, A. L. Mohamed

Powiązania:

https://bibliotekanauki.pl/articles/1192692.pdf

Data publikacji:

2016

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Dynamic relationship
Budget deficit
Economic growth
Export earnings
Exchange rate and Inflation

Opis:

Budget deficit is a debating word in developing countries; it maintains a relationship with economic growth of countries in different aspects. The objective of this study was to test the dynamic relationship between the budget deficit and the economic growth of Sri Lanka using annual time series data from 1959 to 2013.To test this objective, the budget deficit of Sri Lanka was used as main independent variable and the gross domestic product in constant price was utilized as dependent variable. The exports earnings, exchange rate, inflation rate were used supportive independent variables of this study. The Johansen cointegration technique and Vector Error Correction Model were employed to test the long and short - run dynamic relationship between the budget deficit and the economic growth of Sri Lanka. This study found that all variables were cointegrated at 1st difference form. In the meantime the budget deficit and economic growth of Sri Lanka had preserved a long- run dynamic relationship during the study period but no short- run dynamic relationship. In addition, the budget deficit had positive relationship with economic growth of Sri Lanka.

Źródło:

World Scientific News; 2016, 46; 176-188
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

Does consumption expenditure induce the ecomonic growth? An empirical evidence from Sri Lanka

Autorzy:

Aslam, A. L. Mohamed

Powiązania:

https://bibliotekanauki.pl/articles/1178331.pdf

Data publikacji:

2017

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Gross domestic product
consumption expenditure
multiple regression test and Co-integration test

Opis:

Indeed, consumption expenditure is a very important element of increasing the economic growth, which was confirmed by enough empirical studies in different countries. But in Sri Lanka there is no evidence regarding the relationship between the consumption expenditure and economic growth. In order to test this relationship, this study used both multiple regression and Johansen and Juselius cointegration techniques by using time series data during the period of 1975 to 2014 of the following variables: exports, gross domestic product, consumption expenditure of households, and official development assistant. In this study, both techniques confirmed that the consumption expenditure positively impact on the economic growth and moves with the economic growth in the long - run period. Thus, this study strongly confirmed that the consumption expenditure in Sri Lanka induces the economic growth over the sample period. Therefore, this study recommends, if the policy makers should develop the policy to promote the consumption expenditure, the economic growth should be positively moved, so policy makers have to design consumption promotion policy.

Źródło:

World Scientific News; 2017, 81, 2; 221-234
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 45.

Tytuł:

Field assessment of surge and continuous furrow irrigation methods in relation to tillage systems

Autorzy:

A. Mattar, Mohamed
A. El-Saadawy, Mohamed
A. Helmy, Mamdouh
M. Sorour, Hussien

Powiązania:

https://bibliotekanauki.pl/articles/973177.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Instytut Agrofizyki PAN

Tematy:

irrigation
ploughing system
water application
efficiency
distribution uniformity
advance rate

Opis:

Surge flow irrigation is one of the irrigation techniques for controlling furrow irrigation. The aim of this study was to investigate the effect of surge furrow irrigation on water management compared with continuous irrigation for different tillage systems. An experimental field was treated with various tillage systems (mouldboard plough, chisel plough and rotary plough) and water irrigation application methods (continuous flow, control) in which irrigation water was applied continuously, and surge flow (3-surges, 4-surges and 5-surges) in which irrigation water was applied intermittently until it reached the tail end of the furrow. The results showed that water savings obtained using the surge technique were 18.58, 11.84 and 18.93% lower water use than with continuous flow, for the mouldboard, chisel and rotary ploughs, respectively. The 3-surges treatment with the rotary plough reduced the advance time by 25.36% from that for continuous irrigation. The 4-surges treatment with the mouldboard plough had the highest water application efficiency (88.13%). The 3-surges treatment with the rotary plough had the highest distribution uniformity (85.01%). The rotary plough did not cause as much soil aeration around the root system as the other tillage systems. The field research provided information about surge flow, aimed at reducing advance times and increasing irrigation efficiency.

Źródło:

International Agrophysics; 2017, 31, 2
0236-8722

Pojawia się w:

International Agrophysics

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 46.

Tytuł:

Compact Transverse Electric Silicon-on-Insulator Mode Converter for Mode-Division Multiplexer

Autorzy:

Sharaf, Mohamed H.
El-Mashade, Mohamed B.
Emran, Ahmed A.

Powiązania:

https://bibliotekanauki.pl/articles/2055263.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

integrated optics
silicon-on-insulator waveguide
WDM & MDM systems
perturbation theory
integrated optical
devices
hybrid modes
guided waves

Opis:

On-chip optical-interconnect technology emerges as an attractive approach due to its ultra-large bandwidth and ultra-low power consumption. Silicon-on-insulator (SOI) wire waveguides, on the other hand, have been identified to potentially replace copper wires for intra-chip communication. To take advantage of the wide bandwidth of SOI waveguides, wavelengthdivision multiplexing (WDM) has been implemented. However, WDM have inherent drawbacks. Mode-division multiplexing (MDM) is a viable alternative to WDM in MIMO photonic circuits on SOI as it requires only one carrier wavelength to operate. In this vein, mode converters are key components in on-chip MDM systems. The goal of this paper is to introduce a transverse electric mode converter. The suggested device can convert fundamental transverse electric modes to first-order transverse electric ones and vice versa. It is based on small material perturbation which introduces gradual coupling between different modes. This device is very simple and highly compact; the size of which is 3 μm². Mathematical expressions for both the insertion loss and crosstalk are derived and optimized for best performance. In addition, three-dimensional finite-difference time-domain (3D-FDTD) simulations are performed in order to verify the mathematical model of the device. Our numerical results reveal that the proposed device has an insertion loss of 1.2 dB and a crosstalk of 10.1 dB. The device’s insertion loss can be decreased to 0.95 dB by adding tapers to its material perturbation.

Źródło:

International Journal of Electronics and Telecommunications; 2022, 68, 2; 275--280
2300-1933

Pojawia się w:

International Journal of Electronics and Telecommunications

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 47.

Tytuł:

Evaluation of modified hard fluors for biscuit making
Przydatność zmodyfikowanej mąki pochodzącej z twardej pszenicy do produkcji ciastek

Autorzy:

Damir, A.A.
Salem, A.
Mohamed, M.S.

Powiązania:

https://bibliotekanauki.pl/articles/10314.pdf

Data publikacji:

1976

Wydawca:

Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie

Opis:

Przeprowadzono próby modyfikacji mąki pochodzącej z pszenicy twardej w celu uzdatnienia jej jako surowca do produkcji ciastek. W tym celu do mąki mocnej dodawano w różnych stężeniach metadwusiarczyn sodu, siarczyn, skrobię oraz mąkę słabą z mąką słodową. Jako kryterium zmian jakościowych służyły wskaźniki reologiczne ciasta. Potrzebne zmiany jakościowe we właściwościach reologicznych uzyskano przez dodatek 228 mg/kg S₂O₅, 64 mg/kg SO₃, 5% skrobi lub 50% mąki słabej. Mieszanina 20% słodu i 64 mg/kg SO₃ powodowała zmiękczenie ciasta i wzrost jego rozciągliwości, co w efekcie dało najlepszy surowiec do otrzymywania ciastek o wysokiej jakości organoleptycznej. Zmiękczenie ciasta pod wpływem czynników redukujących i słodu powiązane było z ilością wolnych grup SH. Oprócz poprawy jakości uzyskano 27% wzrost objętości ciastek.

Źródło:

Acta Alimentaria Polonica; 1976, 02, 4
0137-1495

Pojawia się w:

Acta Alimentaria Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

Atom pokoju czy wojny? : jak rozmawiać z Iranem

Autorzy:

ElBaradei, Mohamed (1942- ).
Krüger, P. A.

Powiązania:

Forum 2009, nr 4, s. 8-10

Data publikacji:

2009

Tematy:

Międzynarodowa Agencja Energii Atomowej
Polityka międzynarodowa
Bezpieczeństwo międzynarodowe
Broń jądrowa

Opis:

Tł. art. zamieszcz. w "Süddeutsche Zeitung". - 2008.

Dostawca treści:

Bibliografia CBW

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Skocz do pozycji: 49.

Tytuł:

Structural and Optical Properties of Nanostructured Fe-Doped SnO₂

Autorzy:

Saleh, S.
Ibrahim, A.
Mohamed, S.

Powiązania:

https://bibliotekanauki.pl/articles/1398977.pdf

Data publikacji:

2016-06

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

81.07.-b
61.05.C-
78.20.-e

Opis:

Nanocrystalline $Sn_{1-x}Fe_xO_2$ (where x = 0, 0.01, 0.02, 0.03 and 0.04) powders have been successfully synthesized by the hydrothermal method followed by sintering at 1000°C for 3 h. The morphology and structure of the samples have been analyzed by field emission scanning electron microscope and X-ray diffraction, respectively. X-ray diffraction results revealed that all diffraction peaks positions agree well with the reflection of a tetragonal rutile structure of SnO₂ phase without extra peaks. The formation of a tetragonal rutile structure of SnO₂ nanostructures was further supported by the Raman spectra. The band gap of Fe-doped SnO₂ nanoparticles was estimated from the diffuse reflectance spectra using the Kubelka-Munk function and it was decreasing slightly with the increase of Fe ion concentration from 3.59 to 3.52 eV. The variation in band gap is attributed predominantly to the lattice strain and particle size. The presence of chemical bonding was confirmed by the Fourier transform infrared spectra.

Źródło:

Acta Physica Polonica A; 2016, 129, 6; 1220-1225
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 50.

Tytuł:

Effect of compression modalities for recovery on wrestlers’ biomarkers in one day tournament

Autorzy:

Ghoraba*a, Mohamed S.
Ghazy, Marwa F.

Powiązania:

https://bibliotekanauki.pl/articles/1030796.pdf

Data publikacji:

2019

Wydawca:

Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego

Tematy:

Compression modalities
glucose level “GL”
lactic acid “LA”
recovery
serum creatinine “SCR”
wrestling

Opis:

The aim of the study was to investigate the effect of different compression modalities as to recovery enhancement on some biomarkers in wrestlers. Serum creatinine, lactic acid and glucose level were tested in elite wrestlers before a match-up, 3 minutes post-match up and 19 minutes after applying recovery compression model. The results showed insignificant differences between pre-post 3-minutes tests among research groups due to sample equality, 3-minutes and 19-minutes post match up tests showed efficacy of compression technique in enhancing recovery in sake of 160/20 mmHg compression modality with enhancement percentage of 16.614% for serum creatinine, 43.214% for lactic acid and 22.505% for glucose level. The compression band with 160/20 mmHg exceeds recovery after match-up.

Źródło:

Central European Journal of Sport Sciences and Medicine; 2019, 28, 4; 39-52
2300-9705
2353-2807

Pojawia się w:

Central European Journal of Sport Sciences and Medicine

Dostawca treści:

Biblioteka Nauki

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