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Tytuł:
Investigations of Couette flow unsteady radiative convective heat transfer in a vertical channel using the generalized method of lines (MOL)
Autorzy:
Sowayan, Ahmed S.
Powiązania:
https://bibliotekanauki.pl/articles/2174210.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
promieniowanie
konwekcja naturalna
metoda Runge-Kutty
vertical channel
radiation
natural convection
method of lines (MOL)
Runge-Kutta method
Opis:
This study describes a very efficient and fast numerical solution method for the non-steady free convection flow with radiation of a viscous fluid between two infinite vertical parallel walls. The method of lines (MOL) is used together with the Runge-Kutta ODE Matlab solver to investigate this problem numerically. The presence of radiation adds more stiffness and numerical complexity to the problem. A complete derivation in dimensionless form of the governing equations for momentum and energy is also included. A constant heat flux condition is applied at the left wall and a transient numerical solution is obtained for different values of the radiation parameter (R). The results are presented for dimensionless velocity, dimensionless temperature and Nusselt number for different values of the Prandtl number (Pr), Grashof number (Gr), and the radiation parameter (R). As expected, the results show that the convection heat transfer is high when the Nusselt number is high and the radiation parameter is low. It is also shown that the solution method used is simple and efficient and could be easily adopted to solve more complex problems.
Źródło:
International Journal of Applied Mechanics and Engineering; 2022, 27, 3; 199--211
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Revitalizing community with innovative redesign of Taha Hussein Memorial Park in Alexandria
Rewitalizacja dzielnicy z innowacyjnym projektem parku pamięci Taha Husseina w Aleksandrii
Autorzy:
Sharaf Eldin, S.
Ahmed, S.
Powiązania:
https://bibliotekanauki.pl/articles/217972.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Konserwatorów Zabytków
Tematy:
Taha Hussein Park
Alexandria
town
cultural landscape
miasto
krajobraz kulturowy
Opis:
Parks are complex elements of a city. They can serve scores of different uses, may be specialized in their function, or can simply provide visual appeal for residents. However they work and act to define the shape and feel of a city and its neighborhoods, they also function as a conscious tool for revitalization. Parks can upgrade the downturn of a commercial area, support the stabilization of faltering neighborhoods, and provide a landmark element and a point of pride for residents. Cultural landscape is an object of development as well as planning processes. Because of this fact a huge number of elements in urban or rural landscapes are important for preserving the historical character of a place. Moreover, nowadays they should be base for revitalization projects. The case study in this paper is an old park in Alexandria, Egypt, as an example from regional perspective. The paper analyzes cultural and natural potential of “Taha Hussein Park” in Alexandria through site observation and questionnaires. The obtained data analysis resulted in design decisions which were adapted to redesigning of the park. New functions for the memorial park which nowadays is notorious for crimes, physical deterioration, and social isolation, are demonstrated and discussed also from the sustainability point of view. Also, this paper not only sheds a new light on the understanding and reading of one of neglected green areas, but also contributes to the rethinking of the role of Urban Design today within our changing public life. It is a call for Alexandria’s residents and architects to enhance urban quality and city shape, and support the elements that are needed to make that happen.
Parki są ważnymi przestrzeniami w każdym mieście. Mogą mieć różne funkcje lub po prostu zapewnić atrakcyjność wizualną mieszkańcom. Mają duży wpływ na klimat miasta i jego okolicy, pełniąc także funkcję narzędzia do rewitalizacji. Istnienie parku wpływa pozytywnie na rozwój obszaru, również zdegradowanego. Krajobraz kulturowy miasta jest również istotny na drodze rozwoju, a także procesów planowania urbanistycznego. Należy zwrócić uwagę na fakt, że wiele jego elementów wpływa bezpośrednio na szansę zachowania historycznego charakteru miejsca. Co więcej, obecnie powinny one być podstawą do projektów rewitalizacyjnych. Niniejszy artykuł dotyczy jednego z historycznych parków w Aleksandrii w Egipcie, zwanego „Taha Hussein”. Autorzy analizują jego kulturowy i naturalny potencjał wykorzystując wizje lokalne w terenie oraz wywiad. Uzyskane w ten sposób dane zaowocowały decyzjami projektowymi, które zostały uwidocznione w realizacji przebudowy parku. Nowe funkcje parku, który obecnie jest znany z przestępstw, degradacji i społecznej izolacji, jako przestrzeni pamięci są istotne również z punktu widzenia zrównoważonego rozwoju. Ten dokument nie tylko rzuca nowe światło na jeden z zaniedbanych terenów zielonych miasta, ale także przyczynia się do ponownego przemyślenia roli Urban Design dzisiaj, w naszym zmieniającym się życiu publicznym. Jest to wezwanie mieszkańców i architektów Aleksandrii do poprawy jakości przestrzeni urbanistycznych miasta oraz wsparcia wszelkich działań, które są niezbędne do osiągnięcia tego celu.
Źródło:
Wiadomości Konserwatorskie; 2018, 53; 87-93
0860-2395
2544-8870
Pojawia się w:
Wiadomości Konserwatorskie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-source energy networks for cargo Vessels
Autorzy:
Ahmed, S.
Castellazzi, A.
Williams, A.
Powiązania:
https://bibliotekanauki.pl/articles/136252.pdf
Data publikacji:
2016
Wydawca:
EEEIC International Barbara Leonowicz Szabłowska
Tematy:
ship
energy management
renewable energy
solar
marine
storage
Opis:
The paper discusses the feasibility of installing renewable energy generation technologies on sea-going transport, taking into account the additional weight and power consumption. This study in based on the power management of a 26,198 tonne commercial chemical tanker. The management system would aim at reducing the number of generators as well as the power required from burning fossil fuels. After a process of elimination of potential technologies based on feasibility of the project and shipboard application, the work is focused towards photovoltaic and wind energy generation in combination with fossil fueled engines and Li-ion battery storage covering the higher energy density needs, and the intermittent nature of renewables. The network architecture is optimized in order to have the highest efficiency, and reduced system weight. The results show that successful management of the system can lead to reduction in generator requirement, and energy despite the weight of extra installations of photovoltaic and wind energy generation systems. By reducing the number of generators and allowing each remaining one to operate near their maximum power, the specific fuel consumption is improved, the efficiency is increased, resulting in significant fuel and cost saving, along with the mass of fuel to be carried on-board.
Źródło:
Transactions on Environment and Electrical Engineering; 2016, 1, 4; 37-43
2450-5730
Pojawia się w:
Transactions on Environment and Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relation between CO2 emissions and crude oil combustion in Iraq
Autorzy:
Hassan, Ahmed S.
Azeez, Hasan M.
Powiązania:
https://bibliotekanauki.pl/articles/35540085.pdf
Data publikacji:
2021
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
CO2 emission
crude oil
CO2 concentration
Iraq
Opis:
Fossil fuel is the main source for CO2 emissions that causes global warming. This fact is the starting point for this paper, that consider on three different sources of data: crude oil used to calculate CO2 emissions for Iraq for the period from 1980 to 2018; annual data of total CO2 emissions available from the Carbon Dioxide Information Analysis Center (CDIAC) for Iraq and the world for the period from 1980 to 2014; and CO2 concentrations for Iraq for the period from 2002 to 2006 and for the world for the period from 1980 to 2018. The result is a multifaceted according to the dataset sources. Carbon dioxide emissions calculated from Iraqi crude oil was increased from 1.29 Mt in 2012 to 1.97 Mt in 2018. The world and Iraq CO2 emissions with different slop of average line that was 0.5 for world, 0.003 for Iraq, while increased exponential function from 2008 to 2014 to reach 36 and 0.17 Mt, respectively. The highest value of Iraqi CO2 concentration was 403 ppm in 2016, while the global CO2 concentrations slowly increased with slop line equal to 1.75 ppm per year, from minimum value of 338.6 ppm was in 1980, while maximum value of 407.05 ppm was in 2018, that’s mean no decreased in CO2 concentration unless emissions addressed.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2021, 30, 3; 379-387
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Breast cancer cad system by using transfer learning and enhanced ROI
Autorzy:
Al-Huseiny, Muayed S
Sajit, Ahmed S
Powiązania:
https://bibliotekanauki.pl/articles/2097433.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
mammography
transfer learning
computer vision
image processing
Opis:
Computer systems are being employed in specialized professions such as medical diagnosis to alleviate some of the costs and to improve dependability and scalability. This paper implements a computer aided breast cancer diagnosis system. It utilizes the publicly available mini MIAS mammography image dataset. Images are preprocessed to clean isolate breast tissue region. Extracted regions are used to adjust and verify a pretrained convolutional deep neural network, the GoogLeNet. The implemented model shows good performance results compared to other published works with accuracy of 86.6%, sensitivity of 75% and specificity of 88.9%.
Źródło:
Applied Computer Science; 2022, 18, 1; 99--111
1895-3735
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A conservative scheme with optimal error estimates for a multidimensional space-fractional Gross–Pitaevskii equation
Autorzy:
Hendy, Ahmed S.
Macías-Díaz, Jorge E.
Powiązania:
https://bibliotekanauki.pl/articles/330834.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
generalized Gross–Pitaevskii system
Riesz fractional diffusion
Sobolev inequality
conservative method
optimal error bounds
równanie Grossa-Pitaevskiego
nierówność Sobolewa
metoda konserwatywna
optymalna granica błędu
Opis:
The present work departs from an extended form of the classical multi-dimensional Gross–Pitaevskii equation, which considers fractional derivatives of the Riesz type in space, a generalized potential function and angular momentum rotation. It is well known that the classical system possesses functionals which are preserved throughout time. It is easy to check that the generalized fractional model considered in this work also possesses conserved quantities, whence the development of conservative and efficient numerical schemes is pragmatically justified. Motivated by these facts, we propose a finite-difference method based on weighted-shifted Grünwald differences to approximate the solutions of the generalized Gross–Pitaevskii system. We provide here a discrete extension of the uniform Sobolev inequality to multiple dimensions, and show that the proposed method is capable of preserving discrete forms of the mass and the energy of the model. Moreover, we establish thoroughly the stability and the convergence of the technique, and provide some illustrative simulations to show that the method is capable of preserving the total mass and the total energy of the generalized system.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2019, 29, 4; 713-723
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detection of epileptic seizures in EEG by using machine learning techniques
Autorzy:
AL-Huseiny, Muayed S.
Sajit, Ahmed S.
Powiązania:
https://bibliotekanauki.pl/articles/2174474.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
epileptic seizure
EEG
machine learning
CADe
biomedical engineering
napad padaczkowy
uczenie maszynowe
inżynieria biomedyczna
Opis:
In this research a public dataset of recordings of EEG signals of healthy subjects and epileptic patients was used to build three simple classifiers with low time complexity, these are decision tree, random forest and AdaBoost algorithm. The data was initially preprocessed to extract short waves of electrical signals representing brain activity. The signals are then used for the selected models. Experimental results showed that random forest achieved the best accuracy of detection of the presence/absence of epileptic seizure in the EEG signals at 97.23% followed by decision tree with accuracy of 96.93%. The least performing algorithm was the AdaBoost scoring accuracy of 87.23%. Further, the AUC scores were 99% for decision tree, 99.9% for random forest and 95.6% for AdaBoost. These results are comparable to state-of-the-art classifiers which have higher time complexity.
Źródło:
Diagnostyka; 2023, 24, 1; art. no. 2023108
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Inverse Reaction Cross Sections for Some Charged Particles Using the Optical Model Parameters
Autorzy:
Ahmed, Rasha S.
Powiązania:
https://bibliotekanauki.pl/articles/1193016.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Optical reaction cross-sections
charged particles
neutrons
pre-equilibrium models
Opis:
p-nucleus, (_1^2)H-nucleus, (_1^3)H-nucleus, and (_2^4)He-nucleus inverse reaction cross sections have been determined using the optical model potentials in a wide range of target nuclei started from A=1 to A=232 using several incident particle energies ( E = 2, 8, 10, 20, and 40 MeV). In this work, a large number of optical model available parameters were used to calculate the inverse reaction cross section and compared to investigate the effect of the mass number and incident particle energy on the inverse reaction cross section. All the calculations were performed using MATHLAB programming language.
Źródło:
World Scientific News; 2016, 28; 72-83
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Approaching of May maximum surface air temperature to characteristic summer season for Baghdad city
Autorzy:
Muter, Sara A.
Kadhum, Jasim H.
Hassan, Ahmed S.
Powiązania:
https://bibliotekanauki.pl/articles/35539647.pdf
Data publikacji:
2021
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
maximum air temperature
summer season
May
Baghdad
Opis:
Seasonal variability is the complex non-linear response of the physical climate system. There are two types of natural variability: those external and internal to the climate system. In any given season, natural variability may cause the climate to be different than its long-term average. This study examines with the seasonal variation of the maximum temperatures during the summer season. In addition, the maximum temperatures in May become close to the characteristics of the summer season. The monthly data for maximum temperature of May, June and July were used from Iraqi Meteorological Organization and Seismology (IMOS) for 47 years from 1970 to 2017 for Baghdad city. This period was long enough to estimate the range of approaching maximum temperature (Tmax) May to summer. Results revealed a significant Tmax for Baghdad during the second period (1992–2017) and ?shown similar behavior of Tmax in May to June and July; on the contrary that first period (1970–1991). In second period, two phases have been found out, positive phase and negative phase. The positive phase were happened in 1995, 1999, and 2006, and the negative phase was four cases (1992, 2004, 2013, and 2016), while a few cases recorded in first period. The amplitudes of monthly variability had same distance of leaner correlation especially in 1999 and 2013 that represent coherent wave with summer seasons. The variance difference for Tmax between May and June approximately was 2°C for second study’s period, while exceed this range in first period. This variance change to 7.5°C when found difference between July and May.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2021, 30, 3; 400-410
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fate and Transfer of Heavy Metals in Constructed Wetland Mesocosms Subjected Different Hydraulic Regime
Autorzy:
Mohammed, Alya A.
Al Chalabi, Ahmed S.
Sahei, Angham O.
Powiązania:
https://bibliotekanauki.pl/articles/2202285.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
constructed wetland
ferric dewatered sludge
heavy metals
hydraulic regime
plant
Opis:
A constructed wetland may consume different levels of pollution in different types of wastewater. The focus of this study was the removal of heavy metals (Pb, Cr, and Cd) by plants and their fate in constructed wetland mesocosms. With hydraulic regime manipulation, heavy metals were retained in the ferric dewatered sludge either by adsorption to the carboxylate groups and iron oxy-hydroxide under anaerobic conditions or by co-precipitation with iron oxy-hydroxide under aerobic conditions. Under anaerobic conditions, most heavy metals accumulate in the bottom layer and decrease when moving to the top one. In turn, under aerobic conditions, most of the heavy metals accumulate in the bottom and top layers. Plants play a minor role in heavy metal removal. About 16% of total heavy metals added to the ferric dewatered treatment sludge were taken up by plants. Roots accumulated roughly 64% of the total lead take up by plants, 66% of the chromium, and 63% of the cadmium, respectively, and passed 36%, 34%, and 37% of the aboveground tissues for harvesting. As a conclusion of this study, when constructed wetland is used, the role of hydraulic regime, substance used, and vegetation should not be ignored in the process of wastewater purification in constructed wetland.
Źródło:
Journal of Ecological Engineering; 2022, 23, 12; 44--49
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microbial degradation of lignocellulosic biomass: discovery of novel natural lignocellulolytic bacteria
Autorzy:
Ahmed, S.
Rahman, S.
Hasan, M.
Paul, N.
Sajib, A.A.
Powiązania:
https://bibliotekanauki.pl/articles/81125.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
lignocellulose
microbial degradation
biofuel
cellulose
lignin
hemicellulose
lignocellulolytic bacteria
Chryseobacterium gleum
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2018, 99, 2
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of WQI for the Al-Jubalia Water Treatment Plant
Autorzy:
Naeem, Saja M.
Al Chalabi, Ahmed S.
Al-Marj, Ohood K.
Powiązania:
https://bibliotekanauki.pl/articles/2202124.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
WQI
Al-Jubalia
WTP
weight arithmetic index method
relative white
WHO
Iraqi standard
drinking water
Opis:
The water quality index is an effective tool for determining water quality. All water treatment plants in the Basrah governorate source their water from the Shatt al-Arab River. A water quality index (WQI) for both raw and treated water for the Al-Jubalia water treatment plant is obtained in order to assess its acceptability as a source of residential water supply and the performance of water treatment facilities. From January to December 2019, the physicochemical parameters were observed for the calculation of WQI for the annual and four seasons: winter, spring, summer, and autumn. The pH, turbidity, electric conductivity, total alkalinity, total hardness, Ca, Mg, Cl, SO4, TDS, Na, and K are the parameters that were considered in this study. In winter, spring, and summer, the results show that raw and treated water were unsuitable for home, industrial, and irrigation needs. In autumn, only the treated water was classified as good water according to WQI categories. As a result, the quality of the Al-Jubalia WTP treated water supply is unfit for human consumption.
Źródło:
Journal of Ecological Engineering; 2022, 23, 10; 216--228
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phase velocity and attenuation of longitudinal shear vibrations of hollow poroelastic cylinders
Autorzy:
Ahmed Shah, S.
Javvad Hussaini, S.
Powiązania:
https://bibliotekanauki.pl/articles/955126.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
prędkość fazowa
tłumienie drgań podłużnych
teoria Biota
Biot's theory
hollow cylinder
shear waves
frequency equation
phase velocity
attenuation
wavenumber
dissipation
Opis:
The present paper is devoted to the study of phase velocity and attenuation of longitudinal shear vibrations of hollow poroelastic circular cylinders in the presence of dissipation. The explicit expressions for phase velocity and attenuation of longitudinal shear vibrations are derived. The frequency equation of longitudinal shear vibrations and modes obtained in a previous paper are used to compute the phase velocity and attenuation for different dissipations for thin and thick poroelastic cylindrical shells and poroelastic solid cylinder. The physical parameters of sandstone saturated with kerosene and sandstone saturated with water are used for the purpose of computation. It is found that the phase velocity is linear beyond certain frequency. Phase velocity is smaller for a typical anti-symmetric mode compared to the flexural mode. It is greater for the second mode than that of the first mode. Also the phase velocity is larger for a thin poroelastic cylindrical shell than that of a thick poroelastic cylindrical shell. The same is true for attenuation also. Attenuation is very high for the considered dissipations and it increases with the increase in dissipation.
Źródło:
International Journal of Applied Mechanics and Engineering; 2014, 19, 2; 337-346
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Canonical correlations in studying grain yield and protein content as affected by yield components: An ontogenetic approach.
Autorzy:
Kozak, Marcin
Gozdowski, Dariusz
Hossain, Shakhawat
Ahmed, S. Ejaz
Laudański, Zbigniew
Wyszyński, Zdzisław
Powiązania:
https://bibliotekanauki.pl/articles/2199060.pdf
Data publikacji:
2006-12-22
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
multivariate methods
sequential yield analysis
spring barley
Opis:
In the paper, we have proposed an approach to studying the relationship between two sets of variables, when one of the sets comprises plant traits that develop sequentially. The approach joins two statistical methods, namely canonical correlations and sequential yield analysis (Mądry et al., 2005, J. New Seeds 7(1), pp. 85-107). Using the approach, grain yield and protein content in grain of two spring barley cultivars—Rasbet (with hulled grains) and Rastik (with hulless grains)—were studied as the effect of yield components that develop sequentially (number of spikes per m2, number of kernels per spike, and kernel weight)...
Źródło:
Plant Breeding and Seed Science; 2006, 54; 17-27
1429-3862
2083-599X
Pojawia się w:
Plant Breeding and Seed Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorption mechanism and modelling of hydrocarbon contaminants onto rice straw activated carbons
Autorzy:
Abdel daiem, Mahmoud M.
Sánchez-Polo, Manuel
Rashed, Ahmed S.
Kamal, Nehal
Said, Noha
Powiązania:
https://bibliotekanauki.pl/articles/779863.pdf
Data publikacji:
2019
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
activated carbon
rice straw
adsorption mechanism
adsorption modeling
pore volume surface diffusion
Opis:
The adsorption of Diphenolic acid (DPA), 2,4-Dichlorophenoxyacetic acid (2,4-D), and 2-methyl-4-chlorophenoxyacetic acid (MCPA) were examined in aqueous solution using activated carbon rice straw. The rice straw was activated by using two reagents, zinc chloride and phosphoric acid and named as RSZ, RSP, respectively. The results showed that both carbons have a relatively high adsorption capacity. Concerning the adsorption kinetic, the second-order model has better fit than the first model to experimental data. The adsorption yield of both carbons increased in the order: DPA < 2,4-D < MCPA. The pore volume diffusion model satisfactorily fitted the experiment on both carbons. Furthermore, solution pH has a high influence on the adsorption capacity for both carbons. The adsorption mechanism of selected pollutants onto carbon samples has been controlled by dispersion interaction π-π electrons and electrostatic interaction, moreover, the contribution of pore volume diffusion is the controlling mechanism of the overall rate of adsorption.
Źródło:
Polish Journal of Chemical Technology; 2019, 21, 4; 1-12
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Allelopathic efficiency of Eruca sativa in controlling two weeds associated with Pisum sativum plants
Autorzy:
El-Wakeel, M.A.
Ahmed, S.E.-D.A.E.-G.
El-Desoki, E.R.
Powiązania:
https://bibliotekanauki.pl/articles/66437.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Allelopathy is a complex phenomenon which depends on allelochemical concentrations. So, two pot experiments were carried out to investigate the allelopathic effect of alcoholic fresh shoot extract of Eruca sativa (foliar spray) and E. sativa shoot powder (mixed with soil) on Pisum sativum plants and two associated weeds, Phalaris minor and Beta vulgaris. The experiments were conducted in the greenhouse of the National Research Centre, Giza, Egypt during two successive winter seasons (2016–2017 and 2017–2018). Ten treatments were applied in this study. Four treatments were applied before sowing, that E. sativa shoot powder was mixed with the soil at rates of 15, 30, 45 and 60 g ⋅ pot–1. The other four treatments of E. sativa alcoholic fresh shoot extract were sprayed twice on both plants and weeds at 5, 10, 15 and 20% (w/v) concentrations. Additionally, two untreated treatments, healthy (P. sativum only) and unweeded (untreated infested P. sativum plants with weeds) were applied for comparison. The results indicated that both alcoholic extracts and powder reduced growth of both weeds. Moreover, there was a direct relationship between concentration and weed reduction. Eruca sativa alcoholic extracts increased yield parameters of P. sativum plants. The maximum yield attributes were recorded by spraying of E. sativa alcoholic extract at 20%. On the other hand, it was clearly noticed that the high powder rates affected negatively P. sativum yield parameters. But the lowest powder rate (15 g ⋅ pot–1) stimulated P. sativum yield parameters as compared to unweeded treatment. Chemical analysis of E. sativa shoot powder ensured that the abundant amount of glucosinolates (9.6 μmol ⋅ g–1) and phenolic compounds (46.5 mg ⋅ g–1) may be responsible for its allelopathic effect. In conclusion, spraying of alcoholic fresh shoot extract of E. sativa at 20% (w/v) and mixing E. sativa shoot powder at 15 g · pot–1can be applied as natural bioherbicides for controlling weeds.
Źródło:
Journal of Plant Protection Research; 2019, 59, 2
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of tropospheric NO2 over Iraq using OMI satellite measurements
Autorzy:
Rajab, Jasim M.
Hassan, Ahmed S.
Kadhum, Jasim H.
Al-Salihi, Ali M.
San Lim, Hwee
Powiązania:
https://bibliotekanauki.pl/articles/118650.pdf
Data publikacji:
2020
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
nitrogen dioxide
air pollution
remote sensing
Baghdad
Iraq
Opis:
Tropospheric nitrogen dioxide (NO2) is a trace gas with important impact on atmospheric chemistry, human health and a key pollutant in particular cities, measured from space since the mid-1990s by the GOME, SCIAMACHY, OMI, and GOME-2 instruments. This study present ten years (monthly and yearly averaged) dataset from Ozone Monitoring Instrument (OMI) used to investigate tropospheric NO2 characteristics and variations over Iraq during 2005–2014. Annual NO2 shows an elevation from the northern to the southern and highest values was at central parts of Iraq. Monthly distributions revels higher values NO2 in winter and summer than spring and autumn seasons, and rising NO2 throughout study period over industrial and crowded urban zones. The trend analysis over Baghdad shows a linear growth rate 9.8% per year with an annual average (5.6·1015 molecules per 1 cm2). The air mass trajectory analysis as hotspot regions shows seasonal fluctuations between winter and summer seasons depend on weather conditions and topography. The increased NO2 values in winter are due to anthropogenic emissions and subsequent plumes from Europe. In addition, in summer because of hot weather and large paddy fields emissions. The lowest NO2 value was at monsoon period mostly linked to the rains. The OMI data and satellite information are able to observe the troposphere NO2 elevation at different regions.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2020, 29, 1; 3-16
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Response of Camelina sativa Oil to Different Levels of N-P-K and Compost Fertilizers
Autorzy:
El-Sayed, Abd El-Ghafour A.
El-Liethy, Ahmed S.
Hendawy, Saber F.
Hefni, Omnia G.
Powiązania:
https://bibliotekanauki.pl/articles/1955435.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
NPK
Camelina sativa
compost fertilizer
Opis:
This study was conducted during the two winter seasons (2018/2019&2019/2020) to investigate the effect of NPK and compost fertilizers on the Camelina sativa plant under Egyptian ecology. The fertilizer levels of NPK were 0, 25, 50, 75 and 100%, recommended doses, whereas compost was applied at 6, 8 and 10 m3/fed to investigate the effect of these fertilizers and the interaction of both chemical and organic fertilizers on the vegetative growth, oil yield and oil components percentage, especially Linolenic acid (ω-3). The obtained results indicated that the application of 100% NPK as well as 10 m3 of compost produced the highest mean values of all vegetative characteristics compared to unfertilized plants at both samples in the two growing seasons and the other treatments. On the other hand, the results showed that all NPK treatments, i.e. 25, 50, 75, and 100% NPK significantly increased seed yield (g/plant) as compared to control, the mean values were 3.06, 4.70, 9.09 and 10.20 g/plant compared to 1.84 g/plant, respectively, for the 1st season and 3.11, 4.48, 9.27 & 10.27 g/plant comparing to 1.80 of control for the 2nd season. Compost treatments significantly increased the seed yield; the mean values were 5.10, 5.72, 5.88 and 6.42 g/plant in the 1st season and 5.09, 5.73, 5.99 and 6.32 g/plant in the 2nd season for fertilization with 0, 6, 8 and 10 m3/Fed., respectively. The maximum mean values were obtained by compost at 10 m3/fed. The interaction treatment between 100% NPK and 10 m3/fed showed the maximum mean value of seed yield which recorded 10.51 and 10.78 g/plant for the 1st and 2nd seasons, respectively. In contrast, the lowest values of seed yield were obtained from unfertilized plant which recorded 1.09 and 1.04 g/plant for the 1st and 2nd seasons, respectively. The promising effect of NPK fertilizer on fixed oil % and yield was evident with NPK 100%, 52.53% and 52.83% fixed oil, whereas yield was 408.63 and 413.68 l/fed.), followed by 75% NPK which produced fixed oil percentage and yield 46.82, 46.77% as well as 207.29 and 208.06 l/fed for the first and second season, respectively, compared with other treatments and control. The highest fixed oil percentages and yield (l/fed) were recorded with NPK at 100% and compost at 10 m3/fed during both seasons.
Źródło:
Journal of Ecological Engineering; 2021, 22, 7; 260-270
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improving mechanical properties of epoxy by adding multi-wall carbon nanotube
Autorzy:
Fadhil, B. M.
Ahmed, P. S.
Kamal, A. A.
Powiązania:
https://bibliotekanauki.pl/articles/279975.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
multiwall carbon nanotubes
mechanical properties and nanocomposites
Opis:
In this research, multi-walled carbon nanotubes (MWCNTs) are used as the reinforcement in an epoxy resin with weight percentages (0, 0.2, 0.4, 0.6, 0.8, 1)wt%, respectively, by using both direct (nonhomogeneous) and homogeneous dispersion mixing processes to prepare (epoxy/MWCNTs) nanocomposites. Tensile and drop weight impact tests are used to evaluate mechanical properties of the composites. Results show that homogeneous dispersion has a great effect on enhancing mechanical properties of multi-wall carbon nanotube reinforced composites. Adding 0.2 wt% of MWCNTs enhances and increases tensile properties, and adding 0.6 wt% of MWCNTs enhances impact properties.
Źródło:
Journal of Theoretical and Applied Mechanics; 2016, 54, 2; 551-560
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Collection of hospital wastewater data using deduplication approaches
Autorzy:
Khan, N. A.
Sinha, G. R.
Ahmed, S.
Feshchenko, A.
Changani, F.
Qureshi, A.
Mazhar, M. A.
Neklonskyi, I.
Powiązania:
https://bibliotekanauki.pl/articles/1818511.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
statistics
hospital wastewater
medical waste
deduplication
approaches
servers
statystyka
ścieki szpitalne
odpady medyczne
deduplikacja
podejścia
serwery
Opis:
Purpose: This investigation aims to study the various approaches currently used to reduce the load on computer servers in order to better manage data on hospital wastewater treatment and solid waste generation. Design/methodology/approach: This manuscript investigates the taxonomies of deduplication procedures based on literature and other data sources, thereby presenting its classification and its challenges in detection. Findings: Based on the literature survey of deduplication techniques, the method of deduplication dispensed on cloud gadget devices has been found to be a promising research challenge. The gaps discussed include a reduction in storage space, bandwidth, type of disks used, and expenditure on energy usage and heat emissions when implementing these strategies. The art work on a scalable, robust, green and allocated approach to deduplication for a cloud gadget will remain of interest in destiny. Research limitations/implications: Considerable attention is focused on the deduplication due to efficient, extensive storage system. Practical implications: This research paper will be useful to identify deduplication techniques which are nowadays used in different hospital wastewater data collection systems and put significant proposals for further improvements in deduplication. Originality/value: This manuscript portrays a broader assessment of the available literature for data duplication along with the classification of different methods for the data storage used in the different level of storage of hospital wastewater data collection.
Źródło:
Archives of Materials Science and Engineering; 2020, 104, 1; 5--18
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of oggtt on physicochemical properties, antioxidant activity and volatile compounds of noodles
Autorzy:
Bahgaat, Wafaa K.
Ibrahim, Gamil E.
Hussein, Ahmed M. S.
Powiązania:
https://bibliotekanauki.pl/articles/2057991.pdf
Data publikacji:
2022
Wydawca:
Politechnika Łódzka. Wydawnictwo Politechniki Łódzkiej
Tematy:
oggtt noodles
physicochemical properties
antioxidant
volatile compounds
makaron oggtt
właściwości fizykochemiczne
przeciwutleniacz
związki lotne
Opis:
The present investigation aimed to evaluate the effect of noodles supplementation with oggtt at (5,10,15 and 20%) on physicochemical properties, antioxidant activity as well as volatile compounds. The cooked noodles evaluation based on cooking quality like volume and cooking loss as well as colour changes. An increase in protein, fat and ash was observed with the increase of oggtt supplementation level in noodles. The whole wheat flour had the highest value of total phenolic (462.3 μg GAE g−1) compared to oggtt and all fortified noodles without cooking and after cooking. The fortification levels of 5 and 10% did not affect significantly on colour and overall acceptability of noodles. The panelists scores recommended the usage levels of 5 and 10% of oggtt noodles which did not changed significantly in comparison with control sample. The evaluation of oggtt incorporation in noodles volatile compounds performer using HS-GC/MS analysis. Thirty volatile compounds in cooked noodles after fortification with oggtt had identified. The main volatile compound herein was 2-pentyl furan, which represent 44.12, 20.14 and 18.75% in cooked control and fortified noodles with oggtt at 5 and 10% respectively.
Źródło:
Biotechnology and Food Science; 2022, 84, 1; 3--18
2084-0136
2299-6818
Pojawia się w:
Biotechnology and Food Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of Some Inorganic Anions and Organic Compounds as Corrosion Inhibitors of Cu-Zn Alloys in H2SO4 and HNO3 Solutions
Autorzy:
Ahmed, Amal S. I.
Ghanem, Wafaa A.
Hussein, Walaa A.
Gaber, Ghalia A.
Powiązania:
https://bibliotekanauki.pl/articles/351226.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Cu-Zn alloys
oxy-acid solution
inhibition efficiency
inorganic anions
organic compounds
Opis:
Evaluation of inorganic and organic compounds as corrosion inhibitors of Cu-Zn alloys in H2 SO4 and HNO3 solutions was studied using potentiodynamic and impedance spectroscopy along with scanning electron microscope (SEM) and energy dispersive X-Ray analyzer (EDX) investigations. The corrosion inhibition of Cu-Zn alloys was investigated in oxy acid solutions using inorganic potassium permanganate and di-hydrogen phosphate, amino acids as environmentally safe materials, commercial cooling water, and green tea extracts. Both potassium permanganate and di-hydrogen phosphate improve the corrosion resistance of Cu-Zn alloys. Phosphate appears more effective as corrosion inhibitor for Cu-Zn alloys than permanganate. The inhibition efficiency (IE%) of the different amino acids such as valine, leucine and lysine was also calculated. The experimental results have shown that amino acid-like lysine can be used as an efficient corrosion inhibitor for the Cu-Zn alloys in oxy acid solutions. This may be due to the presence of two amino groups adsorbed together. For lysine, inhibition efficiency, IE%, of ~87 and ~59 is for H2SO4 and ~96.3 and 54.9 for HNO3 for alloy I and II respectively are observed. Due to the composition of green water have a great effect on the inhibition action on Cu-Zn alloys which reaching 91.8 and 96.5% for Alloy I and 95.4 and 87.1% for Alloy II in 0.5 M H2 SO4 and HNO3 respectively. Although benzotriazole, in cooling water, is an excellent inhibitor suitable for use in a wide variety of environments, it has toxic properties. So, much of the recent researches have focused on formulating new and more environmentally acceptable preservation solutions. The green tea, as plant extract, will be very environmentally friendly. The EDX confirm the formation of a protective layer on the Cu-Zn alloys containing aluminum in Alloy II. This sequence reflects the beneficial effects of Al in Alloy II. The presence of 2.43% Al in Alloy II improves the corrosion resistance due to the formation of thin, transparent, stable and self-healing Al2 O3 layer. This confirmed the results obtained from the potentiodynamic polarization measurements and EIS methods.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 2; 639-651
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Generation of shock waves in dense plasmas by high-intensity laser pulses
Autorzy:
Pasley, J.
Bush, I. A.
Robinson, A. P. L.
Rajeev, P. P.
Mondal, S.
Lad, A. D.
Ahmed, S.
Narayanan, V.
Ravindra Kumar, D
Kingham, R. J.
Powiązania:
https://bibliotekanauki.pl/articles/147346.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
shock waves
radiation hydrodynamics
laser–plasma interactions
fast ignition
inertial confinement fusion
Doppler spectroscopy
Opis:
When intense short-pulse laser beams (I > 1022 W/m2, τ < 20 ps) interact with high density plasmas, strong shock waves are launched. These shock waves may be generated by a range of processes, and the relative significance of the various mechanisms driving the formation of these shock waves is not well understood. It is challenging to obtain experimental data on shock waves near the focus of such intense laser–plasma interactions. The hydrodynamics of such interactions is, however, of great importance to fast ignition based inertial confinement fusion schemes as it places limits upon the time available for depositing energy in the compressed fuel, and thereby directly affects the laser requirements. In this manuscript we present the results of magnetohydrodynamic simulations showing the formation of shock waves under such conditions, driven by the j × B force and the thermal pressure gradient (where j is the current density and B the magnetic field strength). The time it takes for shock waves to form is evaluated over a wide range of material and current densities. It is shown that the formation of intense relativistic electron current driven shock waves and other related hydrodynamic phenomena may be expected over time scales of relevance to intense laser–plasma experiments and the fast ignition approach to inertial confi nement fusion. A newly emerging technique for studying such interactions is also discussed. This approach is based upon Doppler spectroscopy and offers promise for investigating early time shock wave hydrodynamics launched by intense laser pulses.
Źródło:
Nukleonika; 2015, 60, 2; 193-198
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molecular screening of gastric Helicobacter pullorum recovered from different avian species in Egypt
Autorzy:
Elhelw, R.
Elhariri, M.
Salem, H.M.
Khalefa, H.S.
Hamza, D.A.
Ahmed, Z.S.
Powiązania:
https://bibliotekanauki.pl/articles/16539461.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
Helicobacter pullorum
PCR
sequencing
chicken
resident wild birds
zoonoses
Egypt
Opis:
Helicobacter pullorum ( H. pullorum) is a bacterium that colonizes the intestines of poultry and causes gastroenteritis. Because these species are known as human and/or animal pathogens, identification of H. pullorum is becoming increasingly necessary. The bacterium has been linked to colitis and hepatitis in humans after being transmitted by infected meat consumption. Misdiagnosis of other enteric zoonotic pathogens such as Campylobacter and other Helicobacter species makes the diagnosis of H. pullorum extremely difficult. This study focused on the molecular detection of H. pullorum from the stomach (proventriculus and gizzard) of different avian species as new target organs for detection and transmission between avian species. Proventriculus and gizzards were obtained from 40 freshly dead chickens and resident wild birds (n=40). Diarrhea was found in the farms that were surveyed. DNA was extracted from all collected samples to conduct PCR amplification. The samples were screened for Helicobacter genus-specific 16s using C97 and C05 primers. To confirm the existence of H. pullorum, the positive samples were sequenced. H. pullorum was recorded in two out of 40 chicken samples. In addition, H. pullorum was recorded in one out of 40 resident wild birds. The 16S rRNA gene sequence for Helicobacter genus-specific in poultry and wild birds showed a 100% homology. In conclusion, broiler chickens and resident wild birds are possible reservoirs for H. pullorum, according to this report, and possibly act as a source of infection for humans via the food supply.
Źródło:
Polish Journal of Veterinary Sciences; 2022, 25, 3; 369-374
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 82

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