Skocz do pozycji: 1.

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

/5

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Skocz do pozycji: 2.

Tytuł:

Insurgency and counter-insurgency in Iraq

Autorzy:

Hashim, Ahmed S.

Współwytwórcy:

Bury, Jan. Recenzja

Data publikacji:

2006

Wydawca:

Ithaca : Cornell University Press

Tematy:

Hashim Ahmed. Insurgency and counter-insurgency in Iraq recenzja
Wojna 2003- amerykańsko-iracka recenzja

Dostawca treści:

Bibliografia CBW

/5

Książka

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Skocz do pozycji: 3.

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

/5

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Skocz do pozycji: 4.

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

/5

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Skocz do pozycji: 5.

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

/5

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Skocz do pozycji: 6.

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

/5

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Skocz do pozycji: 7.

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

/5

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Skocz do pozycji: 8.

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

/5

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Skocz do pozycji: 9.

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

/5

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Skocz do pozycji: 10.

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

/5

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Skocz do pozycji: 11.

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

/5

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Skocz do pozycji: 12.

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

/5

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Skocz do pozycji: 13.

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

/5

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Skocz do pozycji: 14.

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

/5

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Skocz do pozycji: 15.

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

/5

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Skocz do pozycji: 16.

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

/5

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Skocz do pozycji: 17.

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

/5

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Skocz do pozycji: 18.

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

/5

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Skocz do pozycji: 19.

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

/5

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Skocz do pozycji: 20.

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

/5

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Skocz do pozycji: 21.

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

/5

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Skocz do pozycji: 22.

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

/5

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Skocz do pozycji: 23.

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

/5

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Skocz do pozycji: 24.

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

/5

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Skocz do pozycji: 25.

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

/5

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Skocz do pozycji: 26.

Tytuł:

Radiation doses to technologists working with 18F-FDG in a PET center with high patient capacity

Autorzy:

Demir, M.
Demir, B.
Yaşar, D.
Sayman, H. B.
Halac, M.
Ahmed, A. S.
Özcan, K.
Uslu, I.

Powiązania:

https://bibliotekanauki.pl/articles/148501.pdf

Data publikacji:

2010

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

whole-body dose
finger doses
personnel dosimetry
18F-FDG
PET-CT

Opis:

The increasing numbers of PET studies for routine diagnosis creates a real hazard to radiation workers. The aim of this study is to estimate the annual whole-body and finger radiation dose to technologists working with 18F-FDG in a PET center with high patient potential. In our PET center, the number of PET imaging has increased almost to 5000 studies per year. Our standard dose for tumor imaging is 518 MBq of 18F-FDG. Five technologists performing all steps of 18F-FDG imaging (5 patients per technologist in a day) were officially involved round the week for handling and injecting 18F-FDG to patients. Whole-body and finger dose measurements with TLDs were performed for two different time periods: i) before shielding precautions during the first 6 months (without a shielding for sterile syringe and without a lead container for shielded syringe) and ii) after shielding precautions during the next 6 months (with a shielding for sterile syringe and with a lead container for shielded syringe). The average annual whole-body radiation dose for one technologist before shielding precautions was 7.82 mSv and after shielding precautions was 5.76 mSv. On the other hand, while the average annual finger radiation doses for one technologist before shielding precautions were 210.36 and 293.72 mSv for the left and right hand, after shielding precautions were they 158.16 and 217.58 mSv for the left and right hand, respectively. According to our results, if one technologist performs the whole-body PET imaging of 5 patients per day, the annual radiation dose to this technologist will not exceed the recommended limits by ICRP.

Źródło:

Nukleonika; 2010, 55, 1; 107-112
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

Influence of wood-derived biochar on the physico-mechanical and chemical characteristics of agricultural soils

Autorzy:

S.F. Ahmed, Ahmed
Raghavan, Vijaya

Powiązania:

https://bibliotekanauki.pl/articles/972584.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Instytut Agrofizyki PAN

Tematy:

biochar
particle size
proctor compaction
plasticity
soil workability

Opis:

Amendment of soil with biochar has been shown to enhance fertility and increase crop productivity, but the specific influence of biochar on soil workability remains unclear. Select physico-mechanical and chemical properties of clay loam and sandy loam soils were measured after amendment with wood-derived biochar of two particle size ranges (0.5-425 and 425-850 μm) at five dosages ranging from 0.5 to 10% dry weight. Whereas the clay loam soil workability decreased when the finer wood-derived biochar was applied at rates of 6 or 10%, soil fertility was not enhanced. The sandy loam soil, due to Proctor compaction, significantly decreased in bulk density with 6 and 10% wood-derived biochar amendments indicating higher soil resistance to compaction.

Źródło:

International Agrophysics; 2018, 32, 1
0236-8722

Pojawia się w:

International Agrophysics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

Microarray-core based circular photonic crystal fiber for high chemical sensing capacity with low confinement loss

Autorzy:

Asaduzzaman, S.
Ahmed, K.

Powiązania:

https://bibliotekanauki.pl/articles/174575.pdf

Data publikacji:

2017

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

circular photonic crystal fiber
confinement loss
elliptical core
chemical sensor
relative sensitivity

Opis:

In this article, a circular photonic crystal fiber based chemical sensor has been presented where core region is designed with an array of elliptical holes. The proposed structure is numerically investigated by using a full vectorial finite element method. From the numerical results, it is observed that introducing an array of elliptical holes helps to obtain the high relative sensitivity and realizes a low confinement loss. In addition, the increase in the value of the diameter of holes in the innermost ring enhances the relative sensitivity. Moreover, the increase in the value of the diameter of holes in the outermost ring reduces the confinement loss. In this work, we have considered an industrially valuable chemical ethanol. Simulation results disclose that the highest relative sensitivity of proposed photonic crystal fiber is 29.25% for ethanol and the confinement loss is 7.68 × 10^–7 dB/m at the wavelength 1.5 µm.

Źródło:

Optica Applicata; 2017, 47, 1; 41-49
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

Friction pressure loss determination of yield power law fluid in eccentric annular laminar flow
Określenie strat ciśnienia przy przepływie laminarnym cieczy opisanej równaniem potęgowym z granicą płynięcia w niecentrycznej przestrzeni pierścieniowej

Autorzy:

Ahmed, R.
Miska, S.
Miska, W.

Powiązania:

https://bibliotekanauki.pl/articles/299590.pdf

Data publikacji:

2006

Wydawca:

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

Tematy:

płuczka wiertnicza
straty ciśnienia
przepływ cieczy
drilling muds
pressure loss
fluid flow

Opis:

Accurate predictions of friction pressure losses are very important in drilling and well completions operations. In some applications, for example, drilling in areas where the margin between pore pressure and fracture pressure gradients is small, inaccurate predictions of bore hole pressure may lead to serious complications and even a loss of the well. This paper is focused on a flow of yield power law type (pseudo-plastic with the yield stress) fluid in the annular space with the possibility that the inner pipe maybe eccentric. A new mathematical model that is based on a concept of generalized average wall shear rate - wall shear stress relationship is presented. A carefully designed laboratory facility that permits accurate differential pressure measurements as a function of flow rate in both pipe and annular flow has been developed. The desired rheology of the fluids was obtained by mixing two types of polymers (PAC and HEC) with water. Pipe flow measurements have been utilized to produce flow curves and subsequently the fluid rheological characterization (yield stress, consistency index and flow behavior index). The results of measured pressure losses are compared to those predicted by the proposed model. While the discrepancies are noticeable the difference is less than 15% and frequently is even less than 5%. We believe that the proposed model is simple useful for practical design applications
Dokładne określenie strat ciśnienia przepływu płuczki w otworze jest bardzo ważne podczas wiercenia i dowiercania. W niektórych warunkach np. podczas wiercenia w interwałach, gdzie różnica między ciśnieniem porowym a gradientem ciśnienia szczelinowania jest mała, niedokładne określenie ciśnienia w otworze może prowadzić do poważnych komplikacji z likwidacją otworu włącznie. Artykuł dotyczy przepływu płynu posiadającego granicę płynięcia, opisanego równaniem potęgowym, w przestrzeni pierścieniowej, w sytuacji niecentrycznego ułożenia przewodu wiertniczego w stosunku do rur okładzinowych lub ściany otworu. Przedstawiony, model matematyczny oparty jest na idei średniej uogólnionej wartości naprężenia ścinającego przy ścianie otworu. Zaprojektowano i wykonano urządzenie laboratoryjne umożliwiające dokładny pomiar strat ciśnienia przy zmiennych prędkościach przepływu w rurze i przestrzeni pierścieniowej. Do badań użyto dwóch typów roztworów polimerów: PAC i HEC, o wymaganych parametrach reologicznych. Pomiary na stanowisku badawczym były podstawą do wykreślenia krzywych płynięcia ww. płynów, jak również do określenia parametrów reologicznych takich, jak: granica płynięcia, współczynnik konsystencji i współczynnik n (miara odchylenia od cieczy newtonowskiej). Wyniki pomiarów strat ciśnienia porównane zostały z wynikami uzyskanymi z obliczeń sporządzonych na podstawie prezentowanego modelu. Jakkolwiek rozbieżności są zauważalne, to jednak różnice nie przekraczają 15%, a w niektórych przypadkach nawet 5%. Mamy nadzieję, że proponowana metodyka będzie z powodzeniem wykorzystywana w zastosowaniach praktycznych

Źródło:

Wiertnictwo, Nafta, Gaz; 2006, 23, 1; 47-53
1507-0042

Pojawia się w:

Wiertnictwo, Nafta, Gaz

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

Synthesis of an optical catalyst for cracking contaminating dyes in the wastewater of factories using indium oxide in nanometer and usage in agriculture

Autorzy:

Ahmed, Ishaq F. E.
El-Shenawy, Ahmed I.
Refat, Moamen S.

Powiązania:

https://bibliotekanauki.pl/articles/778735.pdf

Data publikacji:

2019

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

Photocatalyst
In2O3
precursors
Crystal Violet
Congo Red
NPs

Opis:

Herein, the photocatalytic degradation of the Congo Red (CR) and Crystal Violet (CV) dyes in an aqueous solution were discussed in the presence of an indium(III) oxide (In₂O₃) as optical catalyst efficiency. The caproate bidentate indium(III) precursor complex has been synthesized and well interpreted by elemental analysis, molar conductivity, Fourier transform infrared (FT-IR), UV-Vis, and thermogravimetric (TGA) with its differential thermogravimetric (DTG) studies. The microanalytical and spectroscopic assignments suggested that the associated of mononuclear complex with 1:3 molar ratio (M³⁺:ligand). Octahedral structure is speculated for this parent complex of the caproate anion, CH₃(CH₂)₄COO⁻ ligand. The In₂O₃  NPs with nanoscale range within 10–20 nm was synthesized by a simple, low cost and eco-friendly method using indium(III) caproate complex. Indium oxide nanoparticles were formed after calcination of precursor in static air at 600°C for 3 hrs. The structural, grain size, morphological and decolorization efficiency of the synthesized NPs were characterized using the FT-IR, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and transmission electron microscopy (TEM) analyses. It was worthy mentioned that the prepared In₂O₃  NPs showed a good photodegradation properties against CR and CV organic dyes during 90 min.

Źródło:

Polish Journal of Chemical Technology; 2019, 21, 4; 98-105
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

Parasitic affections of domesticated pigeons (Columba livia) in Jammu, India

Autorzy:

Mehmood, S.
Nashiruddullah, N.
Ahmed, J.A.
Borkataki, S.

Powiązania:

https://bibliotekanauki.pl/articles/6067.pdf

Data publikacji:

2019

Wydawca:

Polskie Towarzystwo Parazytologiczne

Źródło:

Annals of Parasitology; 2019, 65, 1
0043-5163

Pojawia się w:

Annals of Parasitology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

3-Dimensional Surface Magnetic Susceptibility Distributions with Depth to Investigate Anthropogenic Pollutants Boundary in Abuja Metropolis

Autorzy:

Jatto, S. S.
Sule, P. O.
Ahmed, L. A.

Powiązania:

https://bibliotekanauki.pl/articles/184649.pdf

Data publikacji:

2016

Wydawca:

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

Tematy:

vertical distribution
soil pollution
magnetic susceptibility
anthropogenic pollutants
Abuja

Opis:

Changes in the magnetic susceptibility of topsoil, especially in urban areas, are greatly affected by the deposition of anthropogenic metallic dust arising from industrial activities, the burning of fossil fuels, car wear, and tyre abrasion. In this study, magnetic susceptibility measurements were carried out in vertical soil profiles of 30.0 cm depth from the surface at 10.0 cm intervals in about 431 locations within the Abuja metropolis with a view to investigate the penetration ability of magnetic pollutants in the ground. From the obtained data, 3-D surface contour maps were plotted for different depths. The results show a magnetic susceptibility decrease from the surface down the ground to the depth of 30.0cm; most of the recorded susceptibilities were of an anthropogenic origin rather than pedogenic activities. This indicates that the anthropogenic dust depositions are mostly a surface phenomenon and may therefore not pose a risk to groundwater aquifers and near surface wells.

Źródło:

Geology, Geophysics and Environment; 2016, 42, 4; 443-448
2299-8004
2353-0790

Pojawia się w:

Geology, Geophysics and Environment

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

Nanotechnology in Communication Engineering: Issues, Applications, and Future Possibilities

Autorzy:

Elmustafa, S. Ali Ahmed
Sohal, Harwinder Singh

Powiązania:

https://bibliotekanauki.pl/articles/1182754.pdf

Data publikacji:

2017

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Molecular Nano Technology (MNT)
Molecular communication
Nano machines
Nano-communications
Nanotechnology

Opis:

Nanotechnology nowadays became the most amazing studies developed and an active research areas in many fields including civil, chemical engineering, electronics, and medicine, also in materials. In modern sciences, nanotechnology is considered as the next industrial revolution which it may give more possibilities exceed our expectations in many fields. In telecommunication engineering nanotechnology could provide effective solutions for power efficient computing, sensing, memory enlargement, and human machine interaction. Nanotechnology in communication systems also provides ability for manufacturers to produce computer chips and sensors that are considerably smaller, faster, more energy efficient, and cheaper to manufacture than their present-day modules. In this paper an overview of many issues related to nanotechnology in communication systems are discussed, and also paper will provides a brief ideas of the potential application of various nanotechnology developments in the communication systems and the potential for future possibilities researches that may lead to improved communication systems.

Źródło:

World Scientific News; 2017, 66; 134-148
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

Isolated cystic echinococcosis of kidney burlesquing as renal cell carcinoma: a diagnostic pitfall

Autorzy:

Qaddri, S.
Sherwani, R.K.
Ahmed, M.

Powiązania:

https://bibliotekanauki.pl/articles/5755.pdf

Data publikacji:

2015

Wydawca:

Polskie Towarzystwo Parazytologiczne

Opis:

Echinococcus granulosus infection affects worldwide population, including countries of South and Central America, Middle East, sub-Saharan region, Russia and China. In cystic echinococcosis diagnosis is related to the presence of single or multiple well-delineated spherical primary cyst, commonly seen involving liver followed by lungs. Renal hydatid cyst is rare, comprising of about 2–3% of all locations, isolated renal involvement is even rarer. We present a case of hydatid disease in a 45 year male patient who presented with the history of vague flank pain, mild fever and hematuria. IVU showed a filling defect while USG and CT scan displayed multiloculated cyst in the upper pole of right kidney, correlating the clinical and radiological findings a differential diagnosis of cystic renal cell carcinoma and cystic nephroma was derived. Total nephrectomy was done but the histopathological examination of the lesion revealed hydatid cysts and final diagnosis of renal cystic echinococcosis was made.

Źródło:

Annals of Parasitology; 2015, 61, 1
0043-5163

Pojawia się w:

Annals of Parasitology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

Effects of Triangular Core Rotation of a Hybrid Porous Core Terahertz Waveguide

Autorzy:

Ali, S.
Ahmed, N.
Alwee, S.
Islam, M.
Rana, S.
Bhuiyan, T.

Powiązania:

https://bibliotekanauki.pl/articles/227154.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

porous core waveguide
THz waveguide
flat EML
hybrid design
flat dispersion
triangular design
core rotation

Opis:

In this paper, we investigate the effects for rotating the triangular core air hole arrangements of a hybrid design porous core fiber. The triangular core has been rotated in anticlockwise direction to evaluate the impact on different waveguide properties. Effective Material Loss (EML), confinement loss, bending loss, dispersion characteristics and fraction of power flow are calculated to determine the impacts for rotating the triangular core. The porous fiber represented here has a hybrid design in the core area which includes circular rings with central triangular air hole arrangement. The cladding of the investigated fiber has a hexagonal array of air hole distribution. For optimum parameters the reported hybrid porous core fiber shows a flat EML of ±0.000416 cm⁻¹ from 1.5 to 5 terahertz (THz) range and a near zero dispersion of 0.4±0.042 ps/THz/cm from 1.25 to 5.0 THz. Negligible confinement and bending losses are reported for this new type of hybrid porous core design. With improved concept of air hole distribution and exceptional waveguide properties, the reported porous core fiber can be considered as a vital forwarding step in this field of research.

Źródło:

International Journal of Electronics and Telecommunications; 2017, 63, 1; 25-31
2300-1933

Pojawia się w:

International Journal of Electronics and Telecommunications

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

An adolescent girl with giant fibroadenoma – A case report

Autorzy:

Ferdousee, Ishrat
Arafat, S.M. Yasir
Ahmed, Zuhayer

Powiązania:

https://bibliotekanauki.pl/articles/1393845.pdf

Data publikacji:

2016

Wydawca:

Index Copernicus International

Tematy:

Adolescent Girl
Breast Lump
Case Report
Giant Fibroadenoma

Opis:

Though fibroadenoma is the most common benign tumor of the breast and is more common under the age of 30, giant fibroadenoma is rare representing less than 4% of all fibroadenomas. A 12 years old girl presented with rapidly enlarging well-circumscribed firm, non-tender mass in right breast for 2 months which was painless and with no history of trauma, nipple discharge, fever, anorexia, weight loss or axillary lymphadenopathy. There was no family history of neoplasms. Clinically, the lump was about 12 x 12 cm and not fixed to skin or underlying structures with the absence of nipple retraction or discharge. There was no axillary lymphadenopathy. Fine needle aspiration cytology showed a benign proliferative breast disease. Total excision of mass was done preserving nipple and areola having weight of 535 gm with histopathological features suggestive of giant fibroadenoma. Giant fibroadenoma is a benign breast disease that may mimic rare malignant lesion. So, breast and nipple conserving surgery should always be performed irrespective of size of tumor as in this case.

Źródło:

Polish Journal of Surgery; 2016, 88, 4; 218-220
0032-373X
2299-2847

Pojawia się w:

Polish Journal of Surgery

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

Nastoletnia pacjentka z gruczolakowłókniakiem olbrzymim – opis przypadku

Autorzy:

Ferdousee, Ishrat
Arafat, S.M. Yasir
Ahmed, Zuhayer

Powiązania:

https://bibliotekanauki.pl/articles/1393904.pdf

Data publikacji:

2016

Wydawca:

Index Copernicus International

Tematy:

nastoletnia dziewczynka
guz piersi
opis przypadku
gruczolakowłókniak olbrzymi

Opis:

Gruczolakowłókniak jest najczęściej występującym łagodnym guzem piersi i częściej dotyczy pacjentek poniżej 30. roku życia, natomiast gruczolakowłókniak olbrzymi jest rzadko spotykanym guzem, stanowiącym mniej niż 4% wszystkich gruczolakowłókniaków. Do szpitala zgłoszona została 12-letnia dziewczynka z szybko powiększającą się, dobrze odgraniczoną, twardą, nietkliwą masą utrzymującą się od dwóch miesięcy w piersi prawej. Zmiana była niebolesna, w wywiadzie brak urazu, wydzieliny z brodawki sutkowej, gorączki, zaburzeń łaknienia, utraty masy ciała lub powiększenia węzłów chłonnych pachowych. Wywiad rodzinny w kierunku chorób nowotworowych ujemny. W badaniu klinicznym guz wielkości 12 x12 cm, nie przytwierdzony do skóry lub struktur podskórnych, bez wciągnięcia brodawki sutkowej lub wydzieliny z brodawki sutkowej. Powiększenia węzłów chłonnych pachowych nie stwierdzono. Badanie cytologiczne biopsji aspiracyjnej cienkoigłowej wykazało łagodną chorobę proliferacyjną piersi. Przy zachowaniu brodawki sutkowej i otoczki, wykonano całkowite wycięcie masy (535 g) o cechach histopatologicznych wskazujących na gruczolakowłókniaka olbrzymiego. Gruczolakowłókniak olbrzymi jest łagodnym guzem piersi, który może naśladować rzadkie nowotwory złośliwe. W związku z tym, należy zawsze stosować leczenie chirurgiczne oszczędzające pierś i brodawkę sutkową, niezależnie od wielkości guza, jak w tym przypadku.

Źródło:

Polish Journal of Surgery; 2016, 88, 4; 218-220
0032-373X
2299-2847

Pojawia się w:

Polish Journal of Surgery

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Impact of wood-derived biochar on the hydraulic characteristics of compacted soils: Its influence on simulated farmland carbon sequestration

Autorzy:

Ahmed, A.
Kurian, J.
Satyanarayana, S.
Raghavan, V.

Powiązania:

https://bibliotekanauki.pl/articles/2083067.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Instytut Agrofizyki PAN

Tematy:

soil biochar mixture
water retention
pore-size
distribution
hydraulic conductivity
carbon sequestration

Opis:

The addition of biochar is often proposed to increase agricultural soil quality and crop yield, while at the same time sequestering carbon from the atmosphere to help mitigate global climate change. In this research, the pore-size distribution, and saturated hydraulic conductivity of sandy loam and clay loam soils amended with varying dosages (0-10% dry basis) and two different particle sizes (0.5-420 μm (PS1) or 421-841 μm (PS2)) of wood-derived biochar were investigated under compacted conditions (5, 10, or 15 standard Proctor rammer blows (5B, 10B, or 15B, respectively)). In the 5B compacted SL (SL-5B) soil, the volume of the soil fissures and transmission pores decreased, while the volume of the storage pores (SP) increased with increasing wood-derived biochar dosage. 23.1±0.9% of the volume of the 5B compacted clay loam (CL-5B) are storage pores, this value increased to 27.4±2.0% upon amendment with 10% PS1. The saturated hydraulic conductivity of the sandy loam-5B soil amended with 10% PS1 decreased from 6.8±0.3 to 0.80±0.03 mm h-1. The sandy loam farmland C emissions decreased by 0.071 tC ha-1 y-1, whereas CL farmland C emissions decreased by 0.091 tC ha-1 y-1.

Źródło:

International Agrophysics; 2021, 35, 2; 167-177
0236-8722

Pojawia się w:

International Agrophysics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

IFRS innovation, governance practices and firm performance: A new empirical assessment of moderating effects across GCC region

Autorzy:

Alruwaili, Waleed S.
Ahmed, Abdullahi D.
Joshi, Mahesh

Powiązania:

https://bibliotekanauki.pl/articles/22398299.pdf

Data publikacji:

2023

Wydawca:

Instytut Badań Gospodarczych

Tematy:

IFRS innovation
governance practices
firm performance
Saudi listed firms
Gulf Cooperation Council countries (GCC)
International Financial Reporting Standards (IFRS)

Opis:

Research background: Despite the large volume of research which has been conducted, the association between corporate governance mechanisms and firm performance remains a controversial issue, particularly with the growth of accounting settings around the world. Purpose of the article: This study assesses the moderating role of International Financial Reporting Standards (IFRS) on the association between corporate governance mechanisms and firm performance in selected Gulf Cooperation Council (GCC) country-listed firms, namely Saudi Arabia, Qatar, Bahrain, and United Arab Emirates over the period 2016–2019. Methods: Importantly, we examine the direct and indirect influences of royal family members on long-term firm performance. We attempt to answer our research questions using robust estimation methods such as pooled OLS, fixed effect, random effect and first difference models. Findings & value added: The outcome reveals a significant and positive impact of firm size and board size on the firm performance in the pooled sample, while there is a significantly negative influence of financial leverage on firm performance. The impact of RFP on FP is seen to be negative and significant while the interaction term is found to be positive and statistically significant. This notably refers to the possibility that royal family directors could play an essential role in influencing the executive management team to fully react to provide extensive voluntary disclosure and comply with IFRS adoption. Our simultaneous quantile regression analysis displays the influence of corporate governance mechanisms on firm performance in various stages. While we observe that IFRS transformation has improved information comparability, policy makes in GCC countries should continue to foster conducive environment to support innovative business practices that help diversify their economies.

Źródło:

Equilibrium. Quarterly Journal of Economics and Economic Policy; 2023, 18, 3; 615-659
1689-765X
2353-3293

Pojawia się w:

Equilibrium. Quarterly Journal of Economics and Economic Policy

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Response of non-linear shock absorbers-boundary value problem analysis

Autorzy:

Rahman, M. A.
Ahmed, U.
Uddin, M. S.

Powiązania:

https://bibliotekanauki.pl/articles/265424.pdf

Data publikacji:

2013

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

amortyzator
tłumik drgań
stabilność
wartość graniczna
shock absorber
untuned vibration damper
frequency ratios
non-linear springs
non-linear dampers
stability
boundary value problem
multisegment method of integration

Opis:

A nonlinear boundary value problem of two degrees-of-freedom (DOF) untuned vibration damper systems using nonlinear springs and dampers has been numerically studied. As far as untuned damper is concerned, sixteen different combinations of linear and nonlinear springs and dampers have been comprehensively analyzed taking into account transient terms. For different cases, a comparative study is made for response versus time for different spring and damper types at three important frequency ratios: one at r = 1, one at r > 1 and one at r <1. The response of the system is changed because of the spring and damper nonlinearities; the change is different for different cases. Accordingly, an initially stable absorber may become unstable with time and vice versa. The analysis also shows that higher nonlinearity terms make the system more unstable. Numerical simulation includes transient vibrations. Although problems are much more complicated compared to those for a tuned absorber, a comparison of the results generated by the present numerical scheme with the exact one shows quite a reasonable agreement.

Źródło:

International Journal of Applied Mechanics and Engineering; 2013, 18, 3; 793-814
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Improvement of a subgrade soil by using EarthZyme and cement kiln dust waste

Autorzy:

Abdulkareem, Ahmed Hazim
Eyada, Saadoon O.
Mahmood, Nabeel S.

Powiązania:

https://bibliotekanauki.pl/articles/1852537.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

stabilizacja gruntu
ściskanie nieskrępowane
EarthZyme
pył z pieca cementowego
nanomateriał
soil stabilization
unconfined compressions
cement kiln dust
nanomaterial

Opis:

Soil stabilization techniques are widely used for road construction to improve the properties of the subgrade materials. Using new additives and stabilizers to improve soil properties can reduce the costs of construction and reduce the possible negative effects of these materials on the environment. The purpose of this study was to evaluate the use of a liquid based nano-material called EarthZyme (EZ) and cement kiln dust (CKD) as admixtures to improve the soil properties. A mixture of two soils was used in this study which were prepared from mixing sand soil and fine-grained soil. Compaction tests were performed on the soil that was stabilized with the CKD to determine the density-water content relationships. Unconfined compression tests were also conducted on specimens without treatment, specimen treated with the CKD only, and specimens treated with the CKD and the EZ after curing period for seven days. The obtained results indicated that adding the CKD to the soil decreased the values of the unconfined compression strength (UCS) from 5 to 15 percent. However, adding the CKD reduced the maximum dry density (MDD) from 10 to 12 %. As discussed herein, soil stabilization with the EZ had insignificant effects on the results obtained from the unconfined compression test.

Źródło:

Archives of Civil Engineering; 2021, 67, 2; 525-536
1230-2945

Pojawia się w:

Archives of Civil Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Genetic diversity in fruit nutritional composition, anthocyanins, phenolics and antioxidant capacity of plum (Prunus domestica) genotypes
Genetyczna różnorodność w składzie odżywczym owoców, antocyjaniny, fenole oraz zdolność antyoksydacyjna genotypów śliwy (Prunus domestica)

Autorzy:

Nisar, H.
Ahmed, M.
Anjum, M.A.
Hussain, S.

Powiązania:

https://bibliotekanauki.pl/articles/11543260.pdf

Data publikacji:

2015

Wydawca:

Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie

Tematy:

genetic diversity
fruit
nutritional composition
anthocyanin
phenolics
antioxidant capacity
plum
Prunus domestica
genotype
biochemical analysis
biodiversity
proximate composition

Opis:

In the present work, genetic diversity in nutritional composition of sixteen plum genotypes growing at four different locations of Tehsil Rawalakot, District Poonch of Azad Jammu and Kashmir (Pakistan) were studied. Various parameters like moisture, dry matter, ash and total soluble solids contents, acidity, pH, vitamin C and sugar content, shelf-life and sensory/organoleptic evaluation, anthocyanins, phenolics and antioxidant activity were evaluated and variation in these characteristics has been discussed. The results suggested that the genotypes differed in their nutritional composition of fruits, anthocyanin and phenolic contents and antioxidant activity of fruit. The results of the present study regarding the nutritional status of existing plum germplasm will contribute and increase our knowledge about the genus Prunus and broaden the gene pool available for future plant breeding programs.
Badano różnorodność genetyczną w składzie odżywczym szesnastu genotypów śliw rosnących w różnych miejscach Tehsil Rawalakot, Dystrykt Poonch w Azad Jammu i Kashmirze (Pakistan). Oceniono różne parametry, takie jak wilgotność, zawartość popiołu, suchej masy i całkowitą zawartość rozpuszczalnych substancji stałych, kwasowość, pH, zawartość witaminy C, cukru, antocyjanów i fenoli, okres trwałości, cechy sensoryczne/organoleptyczne, a także omówiono zróżnicowanie tych cech. Na podstawie wyników można stwierdzić, że genotypy różniły się składem odżywczym, zawartością antocyjan i fenoli oraz zdolnością antyoksydacyjną owoców. Wyniki badania dotyczące składników odżywczych istniejącej germplazmy przyczynią się do pogłębienia wiedzy na temat gatunku Prunus oraz poszerzą pule genową dostępną dla przyszłych programów hodowli roślin.

Źródło:

Acta Scientiarum Polonorum. Hortorum Cultus; 2015, 14, 1; 45-61
1644-0692

Pojawia się w:

Acta Scientiarum Polonorum. Hortorum Cultus

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Celestite upgrading by jigs in presence of steel balls as ragging material

Autorzy:

Sobhy, Ahmed
El-Midany, Ayman A.
Ibrahim, Susan S.

Powiązania:

https://bibliotekanauki.pl/articles/1447020.pdf

Data publikacji:

2021

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

celestite
calcite
jigging
ragging material
gravity separation
statistical analysis

Opis:

Gravity separation using jigs is widely used for coarse particle sizes separation. However, fine sizes reduce jig performance. In this study, the upgrading of celestite ore by jig was investigated at different size fractions in the presence of ragging material. Three size fractions, i.e., -15+2 mm, - 2.0 + 0.50 mm and - 0.50 + 0.08 mm were used. The steel balls were used, as ragging material, to improve the separation of fines as well as to improve the concentrate quality. The statistical design was used to correlate celestite grade and recovery with studied operating variables, i.e., the ragging number of layers, ragging balls diameter, and separation time, at a fixed water flow rate and stroke length. The design results indicated that the ragging balls diameter and their number of layers play an important role. The smaller the ragging balls diameter and the higher the ragging number of layers are the better the concentrate grade but the longer the separation time. A celestite concentrate of (> 95% SrSO4) with 74.5% recovery was obtained for - 2.0 + 0.50 mm size fraction at the optimum conditions; i.e., 3.1 mm ragging balls diameter, one ragging layers, and 15 minutes separation time.

Źródło:

Physicochemical Problems of Mineral Processing; 2021, 57, 5; 118-128
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

Evaluation of the carbon sequestration capacity of arid mangroves along nutrient availability and salinity gradients along the Red Sea coastline of Saudi Arabia

Autorzy:

Shaltout, K.H.
Ahmed, M.T.
Alrumman, S.A.
Ahmed, D.A.
Eid, E.M.

Powiązania:

https://bibliotekanauki.pl/articles/48145.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Instytut Oceanologii PAN

Tematy:

carbon sequestration
coastal wetland
mangrove
climate change
nutrient availability
salinity gradient
Red Sea
Saudi Arabia

Źródło:

Oceanologia; 2020, 62, 1
0078-3234

Pojawia się w:

Oceanologia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

Passive filter design for three-phase inverter interfacing in distributed generation

Autorzy:

Ahmed, K. H.
Finney, S. J.
Williams, B. W.

Powiązania:

https://bibliotekanauki.pl/articles/262578.pdf

Data publikacji:

2007

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

Tematy:

DG
inverter
grid connected
filtering
damping
harmonics

Opis:

With the growing use of inverters in distributed generation, the problem of injected harmonics becomes critical. These harmonics require the connection of low pass filters between the inverter and the network. This paper presents a design method for the output LC filter in grid coupled applications in distributed generation systems. The design is according to the harmonics standards that determine the level of current harmonics injected into the grid network. Analytical expressions for the maximum inductor ripple current are derived. The filter capacitor design depends on the allowable level of switching components injected into the grid. Different passive filter damping techniques to suppress resonance affects are investigated and evaluated. Simulated results are included to verify the derived expressions.

Źródło:

Electrical Power Quality and Utilisation. Journal; 2007, 13, 2; 49-58
1896-4672

Pojawia się w:

Electrical Power Quality and Utilisation. Journal

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

Statistical Properties and Estimation of Power-Transmuted Inverse Rayleigh Distribution

Autorzy:

Hassan, Amal S.
Assar, Salwa M.
Abdelghaffar, Ahmed M.

Powiązania:

https://bibliotekanauki.pl/articles/1058930.pdf

Data publikacji:

2020-09-04

Wydawca:

Główny Urząd Statystyczny

Tematy:

percentiles

Opis:

A three-parameter continuous distribution is constructed, using a power transformation related to the transmuted inverse Rayleigh (TIR) distribution. A comprehensive account of the statistical properties is provided, including the following: the quantile function, moments, incomplete moments, mean residual life function and Rényi entropy. Three classical procedures for estimating population parameters are analysed. A simulation study is provided to compare the performance of different estimates. Finally, a real data application is used to illustrate the usefulness of the recommended distribution in modelling real data.

Źródło:

Statistics in Transition new series; 2020, 21, 3; 93-107
1234-7655

Pojawia się w:

Statistics in Transition new series

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

Flotation after a direct contact of flotation reagents with carbonate particles. Part 1, Model investigations

Autorzy:

Ahmed, H. A. M.
Aljuhani, M. S.
Drzymala, J.

Powiązania:

https://bibliotekanauki.pl/articles/109753.pdf

Data publikacji:

2013

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

phosphates
flotation
microemulsion
separation Introduction

Opis:

Carbonate fluorapatite (francolite), calcite and dolomite separately, as well as their model mixtures, were subjected to flotation after conditioning the particles with microemulsion consisting of 20% of Custafloat AR27 (collector, blend of fatty acid soaps and sulfates), 55% fuel oil #5 and 25% water at 70% solids density and subsequent pulp dilution with water to 25% solids. The best separation of carbonate fluorapatite from calcite and dolomite occurred at pH 8.5 and microemulsion dose between 0.9 and 1.5 kg/Mg, 1.5 min conditioning time and 2 minutes of flotation time. The obtained flotation concentrates using 1.5 kg/Mg of collector contained 84% carbonate fluorapatite (34% P2O5) with 84% recovery. The 84/84 separation efficiency in terms of grade-recovery indices points to promising results which can be obtained for real phosphate ores.

Źródło:

Physicochemical Problems of Mineral Processing; 2013, 49, 2; 713-723
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

Biodiversity in morphological and physico-chemical characteristics of wild raspberry (Rubus idaeus L.) germplasm collected from temperate region of Azad Jammu and Kashmir (Pakistan)
Różnorodność biologiczna w morfologicznych i fizyko-chemicznych cechach materiału genetycznego maliny właściwej (Rubus idaeus L.) zbieranej w regionie umiarkowanym Azad Jammu i Kaszmiru (Pakistan)

Autorzy:

Ahmed, M.
Anjum, M.A.
Khaqan, K.
Hussain, S.

Powiązania:

https://bibliotekanauki.pl/articles/11542966.pdf

Data publikacji:

2014

Wydawca:

Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie

Tematy:

biodiversity
morphological characteristics
physicochemical characteristics
wild plant
raspberry
Rubus idaeus
germplasm
temperate region
Azad Jammu and Kashmir
Pakistan

Opis:

Wild raspberry (Rubus idaeus L.) is abundantly grown and widely distributed in temperate regions of lower Himalayan range which represents rich biological diversity for raspberry. Thirty accessions were explored from three different locations of Azad Jammu and Kashmir (Pakistan), several traits were visualized at sampling locations and some characteristics were evaluated and quantified after harvest of leaf and fruit samples. The accessions differed greatly in growth habit, blooming time, intensity of flowering, fruit setting, ripening time, productivity, fruit shape and color. Concerning quantitative characteristics, significant differences were found in plant height, leaf length and width, number of braches per plant, duration of flowering, fruit setting percentage, days to maturity, fruit length, width and weight among the samples collected from different locations. Ripe fruits were evaluated for their chemical composition i.e. moisture, carbohydrates, protein, fat, fiber, ash, TSS, acidity, pH and mineral (K, Ca, Na, Fe, Cu, Zn, Mn, Pb, and Cr) contents. The location also had significant effect on chemical composition of ripe fruits.
Malina właściwa (Rubus idaeus L.) jest często hodowana i szeroko rozprowadzana w umiarkowanych rejonach niższego pasma Himalajów, które reprezentuje bogatą różnorodność biologiczną malin. Zbadano trzydzieści próbek z trzech różnych miejsc Azad Jammu i Kaszmiru (Pakistan), dokonano wizualizacji kilkunastu cech w miejscach pobierania próbek oraz oceniono i ilościowo określono kilka cech po zebraniu próbek liści i owoców. Próbki znacznie różniły się wzrostem, czasem kwitnienia, intensywnością zakwitania, zawiązywaniem owoców, czasem dojrzewania, plonowaniem oraz kształtem i kolorem owoców. Jeśli chodzi o cechy ilościowe, to stwierdzono istotne różnice w wysokości roślin, długości i szerokości liści, liczbie gałązek na roślinie, długości kwitnienia, procencie zawiązywanych owoców, liczbie dni do dojrzałości, długości owoców, szerokości i wadze pomiędzy próbkami zebranymi z różnych stanowisk. Dojrzałe owoce oceniono pod względem składu chemicznego, tzn. wilgotności, zawartości węglowodanów, białka, tłuszczu, błonnika, popiołu, TSS, kwasowości, pH oraz zawartości minerałów (K, Ca, Na, Fe, Cu, Zn, Mn, Pb oraz Cr). Stanowisko także miało istotny wpływ na skład chemiczny dojrzałych owoców.

Źródło:

Acta Scientiarum Polonorum. Hortorum Cultus; 2014, 13, 4; 117-134
1644-0692

Pojawia się w:

Acta Scientiarum Polonorum. Hortorum Cultus

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

Longitudinal shear in composite deck slabs using corrugated steel sheets

Autorzy:

Alkurayshi, Hakim S. M.
Jawad, Adnan K.
Dawood, Alaa M.
Hakim S., Ahmed

Powiązania:

https://bibliotekanauki.pl/articles/35540380.pdf

Data publikacji:

2021

Wydawca:

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

Tematy:

corrugated sheets
shear transfer
shear span
slip
deflection

Opis:

Profile deck steel sheets are used in composite deck slabs. These sheets are standard in dimensions and shapes besides they are supplied with embossments and indentations. Such sheets are not available in Iraqi markets nowadays therefore people used another type of sheets which are corrugated without embossments or indentations in very wide range. This study covers the use of such sheets in composite slabs as decks instead of standard profiled steel sheets. The study comprises testing slabs of dimensions 0.9 × 2.5 m reinforced by steel fabric mesh and rested on corrugated sheets. Two types of shear spans are selected shorter and longer to study the longitudinal shear force transmitted due to the applied loads according to the Eurocode 4. The shorter shear spans are 600, 500 and 400 mm while longer one is 800, 750 and 700 mm. The study extended to support the requirements of design equation of the Eurocode by shear bond method also known as m–k method. The evaluated values of m and k are 0.094 and 65 respectively. The result of k which plays a very important role in shear transfer is small compared to what available in literature, therefore it is recommended to make use of shear connectors in such construction or any else method.

Źródło:

Scientific Review Engineering and Environmental Sciences; 2021, 30, 3; 411-423
1732-9353

Pojawia się w:

Scientific Review Engineering and Environmental Sciences

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 50.

Tytuł:

Effect of local tree seeds in the control of root knot nematode Meloidogyne javanica (Treub) Chitwood and growth promotion of chickpea (Cicer arietinum L.) and mung bean (Vigna radiata L.)
Stosowanie nasion z lokalnych drzew do zwalczania guzaka korzeniowego Meloidogyne javanica (Treub) Chitwood oraz wspomagania wzrostu ciecierzycy pospolitej (Cicer arietinum L.) i fasoli mung (Vigna radiata L.)

Autorzy:

Ahmed, Z.M.
Dawar, S.
Tariq, M.
Zaki, M.J.

Powiązania:

https://bibliotekanauki.pl/articles/26908.pdf

Data publikacji:

2010

Wydawca:

Polskie Towarzystwo Botaniczne

Tematy:

local tree
tree seed
seed
Azadirachta indica
Adenanthera pavonina
Leucaena leucocephala
control
root knot
nematode
Meloidogyne javanica
growth promotion
chick-pea
Cicer arietinum
mung bean
Vigna radiata

Opis:

Seeds of local trees, such Azadirachta indica A. Juss, Adenanthera pavonina L., Leucaena leucocephala (Lam.) de Wit and Eucalyptus spp., were used as aqueous extract at 25, 50 and 100 % concentration to control the activity of Meloidogyne javanica (Treub) Citwood. All seed extracts showed lethal effect on M. javanica eggs, and a gradual decrease in egg hatching and an increase in mortality of second-stage juveniles were observed with the increase in extract concentration. L. leucocephala was found to be most effective in reducing egg hatching, whereas 100 % mortality of juveniles was observed in the case of A. indica seed extract. Number of knots was significantly reduced at 100 % concentration when seeds of chick pea and mung bean were treated and soil was drenched with A. pavonina and Eucalyptus spp. seed extract.

Źródło:

Acta Agrobotanica; 2010, 63, 1
0065-0951
2300-357X

Pojawia się w:

Acta Agrobotanica

Dostawca treści:

Biblioteka Nauki

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