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Wyświetlanie 1-28 z 28
Tytuł:
Medical and healthcare devices: materials perspective
Autorzy:
Hasan, M. K
Anand, S. C
Powiązania:
https://bibliotekanauki.pl/articles/134879.pdf
Data publikacji:
2014
Wydawca:
Tomasz Mariusz Majka
Tematy:
medical device
healthcare device
medical textile
wound dressing
Opis:
People are special. The importance and need for the research and development into medical and healthcare devices can never be overstated. In the 21st century, medical and healthcare devices play a more vital role in our lives than ever before. A wide range of materials are being used for producing numerous medical and healthcare devices for a variety of end use. In this manuscript, historical development of wound care dressings and products are reviewed. The characteristics and requirements of modern wound dressings are summarized. A core part is devoted to the description of the materials used in medical and healthcare devices. Selected synthetic polymers are listed with their applications in medical and healthcare devices. The advantages and limitations of fibres, metals, ceramics and composites are denoted. Textile structures are highlighted with their applications in medical and healthcare devices.
Źródło:
Journal of Education and Technical Sciences; 2014, 1, 1; 10-13
2300-7419
2392-036X
Pojawia się w:
Journal of Education and Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relation between CO2 emissions and crude oil combustion in Iraq
Autorzy:
Hassan, Ahmed S.
Azeez, Hasan M.
Powiązania:
https://bibliotekanauki.pl/articles/35540085.pdf
Data publikacji:
2021
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
CO2 emission
crude oil
CO2 concentration
Iraq
Opis:
Fossil fuel is the main source for CO2 emissions that causes global warming. This fact is the starting point for this paper, that consider on three different sources of data: crude oil used to calculate CO2 emissions for Iraq for the period from 1980 to 2018; annual data of total CO2 emissions available from the Carbon Dioxide Information Analysis Center (CDIAC) for Iraq and the world for the period from 1980 to 2014; and CO2 concentrations for Iraq for the period from 2002 to 2006 and for the world for the period from 1980 to 2018. The result is a multifaceted according to the dataset sources. Carbon dioxide emissions calculated from Iraqi crude oil was increased from 1.29 Mt in 2012 to 1.97 Mt in 2018. The world and Iraq CO2 emissions with different slop of average line that was 0.5 for world, 0.003 for Iraq, while increased exponential function from 2008 to 2014 to reach 36 and 0.17 Mt, respectively. The highest value of Iraqi CO2 concentration was 403 ppm in 2016, while the global CO2 concentrations slowly increased with slop line equal to 1.75 ppm per year, from minimum value of 338.6 ppm was in 1980, while maximum value of 407.05 ppm was in 2018, that’s mean no decreased in CO2 concentration unless emissions addressed.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2021, 30, 3; 379-387
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Fibre Length and Preparation on Mechanical Properties of Carbon Fibre/Polyamide 6 Hybrid Yarns and Composites
Wpływ długości i przygotowania włókien na mechaniczne właściwości hybrydowych przędz z włókien węglowych i poliamidowych oraz wykonanych z nich kompozytów
Autorzy:
Hengstermann, M.
Hasan, M. M. B.
Abdkader, A.
Cherif, C.
Powiązania:
https://bibliotekanauki.pl/articles/233240.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
carbon staple fibre
hybrid yarn
carding
spinning
composites
włókno węglowe
przędza hybrydowa
kompozyty
zgrzeblanie
Opis:
The aim of this paper was to investigate the effect of carbon fibre (CF) length and preparation prior to carding on the mechanical properties of hybrid yarns as well as composites consisting of CF and polyamide 6 (PA 6). The hybrid yarns are manufactured using an optimised process route of carding and drawing with a flyer machine from virgin staple CF (40/60/80/100 mm) and PA 6. In order to explore the effect of fibre preparation on the mechanical properties of hybrid yarns as well as composites, virgin staple CF and PA 6 fibres were prepared by varying the mixing type prior to the carding process. For this purpose, the fibres were mixed either by a fibre-opening device or supplied directly to the carding machine without prior mixing. The CF content of the card webs produced is kept at 50 volume %. Hybrid yarns were produced with a twist of 102 twist/m and then thermoplastic uni-directional (UD) composites were manufactured from them. The investigations revealed the influence of the input CF length and mixing type on the mechanical properties of hybrid yarns and thermoplastic UD composites.
Celem badań było stwierdzenie wpływu długości włókien węglowych i ich obróbki przed zgrzebleniem na mechaniczne właściwości przędz hybrydowych/włókno węglowe /poliamid 6/ jak również kompozytów z nich wykonanych. Zmieniano skład mieszanki przed zgrzebleniem. Włókna mieszano lub dostarczano bezpośrednio do zgrzeblenia. Zastosowano zoptymalizowany proces zgrzeblenia i rozciągania z użyciem niedoprzędzarki. Przędze hybrydowe posiadały skręt 102 skręty/m. Z przędz hybrydowych produkowano termoplastyczne kompozyty „jednokierunkowe”. Badania wykazały wpływ parametrów wejściowych na końcowe właściwości kompozytów.
Źródło:
Fibres & Textiles in Eastern Europe; 2016, 5 (119); 55-62
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative Investigation of Exhaust Emissions of Variable Compression Ratio Engine Utilizing Blends of Linseed Oil Biodiesels, Isopropyl Alcohol, Diethyl Ether with Standard Diesel
Autorzy:
Verma, Ajay Singh
Hasan, M. Muzaffarul
Karnwal, Ashish
Powiązania:
https://bibliotekanauki.pl/articles/1159983.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Variable compression ratio engine
biodiesels
diethyl ether
exhaust emission
isopropyl alcohol
linseed oil
Opis:
Biodiesel is well known substitute fuel for combustion ignition engines. It can diminish the various harmful emissions like carbon monoxide (CO), hydrocarbon (HC) and particulate matter (PM) emissions; however it holds some draw back that includes increase in nitrogen oxides (NOX) emission as compared with diesel fuel. The present work demonstrates the comparative study of exhaust emissions of a 4-stroke naturally aspirated variable compression ratio compression ignition engine utilizing biodiesel made from linseed oil and sesame oil. Various results of exhaust emissions are obtained through exhaustive experiments at compression ratio 17 and 18. Study showed that the linseed oil displayed the improved emission results in HC emissions and CO emissions whereas blend of isopropyl alcohol and diethyl ether displayed the better emissions of CO2 and NOX and standard diesel as well.
Źródło:
World Scientific News; 2018, 113; 238-250
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of a Method for Characterization of the Fibre Length of Long Staple Carbon Fibres Based on Image Analysis
Opracowanie metody dla charakteryzacji długości węglowych włókien ciętych o dużej długości
Autorzy:
Hengstermann, M.
Bardl, G.
Rao, H.
Abdkader, A.
Badrul Hasan, M. M.
Cherif, C.
Powiązania:
https://bibliotekanauki.pl/articles/233180.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
carbon fibre
fibrogram
span length diagram
staple length
włókno węglowe
Opis:
For the manufacturing of load-bearing carbon fibre reinforced plastics (CFRP) made from staple carbon fibres (CF) , statements of the CF fibre length in the composite are essential. However, no suitable fibre length measuring method is currently available for long staple CF over 60 mm. The aim of this study is the development of an effective method for characterization of the fibre length distribution of long staple CF. For this method, a fibre beard specimen is extracted from a sliver manufactured from 80 mm staple CF, which is then scanned. Greyscale values densities (GD) of the individual length classes are determined from the scanned images, which correspond to the number of fibres per length class. From the proportion of all length classes, a span length diagram and staple fibre length diagram can be compiled. The results show the good potential of the method developed for the fibre length measurement of long staple CF.
Dla wytwarzania kompozytów ze wzmocnieniem włókien węglowych bardzo ważna jest znajomość rozkładu długości tych włókien. Niestety, jak dotychczas nie istniały odpowiednie metody pomiarowe pozwalające charakteryzować włókna odcinkowe o długościach powyżej 60 mm. Celem pracy była analiza istniejących metod pomiarowych oraz opracowanie metody, która umożliwiłaby satysfakcjonujące rozwiązanie tego zagadnienia. Zostały przedstawione zasady działania tej metody oraz uzyskana dokładność pomiarów.
Źródło:
Fibres & Textiles in Eastern Europe; 2016, 4 (118); 39-44
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The global influence of local symmetry on entropy of the Universe
Autorzy:
Majka, M.
Gajewski, M.
Hasan, M. K.
Majka, T. M.
Powiązania:
https://bibliotekanauki.pl/articles/134889.pdf
Data publikacji:
2016
Wydawca:
Tomasz Mariusz Majka
Tematy:
local symmetry
global symmetry
gravitational entropy
point symmetry
Opis:
Space and matter were created in the Big Bang. Since Big Bang, the Universe has been expanding continually by increasing its entropy. The fundamental forces broke their symmetries, making impossible to unify them together. Nevertheless, the symmetry of the Universe has not changed and interestingly will never. By analysing global and local symmetry, this paper will present a hypothesis on the future shape and energy expansion of the Universe. A new theory of point symmetry of the Universe will also be introduced.
Źródło:
Journal of Education and Technical Sciences; 2016, 3, 1; 5-7
2300-7419
2392-036X
Pojawia się w:
Journal of Education and Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prediction of protein subcellular localization using support vector machine with the choice of proper kernel
Autorzy:
Hasan, M.A.M.
Ahmad, S.
Molla, M.K.I.
Powiązania:
https://bibliotekanauki.pl/articles/81150.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
subcellular localization
protein
prediction
support vector machine
model selection
kernel
radial base function
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2017, 98, 2
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parametric studies on split S-shaped composite meta atom for X-band communication
Autorzy:
Hasan, M. M.
Faruque, M. R. I.
Islam, M. T.
Powiązania:
https://bibliotekanauki.pl/articles/200602.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Capacitance
DNG
inductance
meta-atom
indukcyjność
meta atom
Opis:
The aim of this paper is to describe a split S-shaped composite meta atom which shows double negative characteristics at resonance frequency. The proposed meta-atom structure exhibits an almost 3.70 GHz bandwidth when the operating frequency from 8 to 14 GHz (X-band). In this study, the ring width, split width, size of substrate material, and the substrate material itself are varying to investigate their effect on the resonance frequencies. Metal strips of the outer resonator are the splits and the inner ring resonator is designed in a way that it forms a split S-shaped structure on the epoxy resin fibre (FR-4) substrate material. The CST Microwave Studio electromagnetic simulator software was used for the design and simulation purposes, and an Agilent N5227A vector network analyser was used for practical measurements.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 4; 533-539
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement methods of dynamic yarn tension in a ring spinning process
Metody pomiaru naprężeń przędz w stanie dynamicznym w przędzarce obrączkowej
Autorzy:
Hossain, M.
Abdkader, A.
Nocke, A.
Unger, R.
Krzywinski, F.
Hasan, M. M. B.
Cherif, C.
Powiązania:
https://bibliotekanauki.pl/articles/232351.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
balloon tension
ring spinning
winding tension
measurement method
przędzenie obrączkowe
naprężenie przędzy
strefa skręcania
strefa balonu
metoda pomiaru
Opis:
The most common measuring method to characterise the dynamic yarn path in the ring spinning process is to measure the yarn tension, where the yarn path is almost straight. However, it is much more complex to measure the yarn tension at the other positions, for example, between the yarn guide and traveller (balloon zone) and between the traveller and winding point of the cop (winding zone), as the yarn rotates continuously around the spindle axis. In this paper, two new methods of yarn tension measurement in the balloon zone are proposed. In the first method, the balloon shape was first recorded with a high speed camera. The balloon tension was then calculated by comparing the yarn strain (occurring in the balloon zone) measured by a digital image analysis program with the stress-strain curve of the yarn produced. In the second method, the radial forces of the rotating balloon were measured by using modified measurement techniques for measurement of yarn tension. Moreover a customised sensor was developed to measure the winding tension between the traveller and cop. The values measured were validated with a theoretical model and a good correlation between the measured and theoretical values could be revealed.
Najczęściej stosowaną metodą pomiarową dla scharakteryzowania dynamiki przędzy podczas przędzenia obrączkowego jest pomiar naprężenia przędzy w miejscu gdzie jej przebieg jest prawie prostoliniowy. Jednakże znacznie bardziej skomplikowany jest pomiar naprężenia przędzy pomiędzy prowadnikiem i biegaczem (strefa balonu) oraz pomiędzy biegaczem i punktem skręcania przed cewką nawojowa (strefa skręcania) ponieważ przędza wiruje w sposób ciągły wokół osi wrzeciona. W pracy przedstawiono dwie nowe metody pomiaru naprężenia przędzy w strefie balonu. W pierwszej wstępnie określano kształt balonu za pomocą kamery o dużej prędkości powtarzania. Następnie określano naprężenie balonu przez porównanie odkształceń przędzy powstających w strefie balonu a mierzonych za pomocą cyfrowej analizy obrazu i programu wykorzystującego krzywą zależności naprężenie-odkształcenie produkowanej przędzy. W drugiej metodzie promieniowe siły wirującego balonu były mierzone przy zastosowaniu zmodernizowanej techniki pomiaru naprężenia przędzy. Pomierzone wartości były porównywane z wartościami modelu teoretycznego przy czym stwierdzono istnienie bardzo dobrej korelacji.
Źródło:
Fibres & Textiles in Eastern Europe; 2016, 1 (115); 36-43
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microbial degradation of lignocellulosic biomass: discovery of novel natural lignocellulolytic bacteria
Autorzy:
Ahmed, S.
Rahman, S.
Hasan, M.
Paul, N.
Sajib, A.A.
Powiązania:
https://bibliotekanauki.pl/articles/81125.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
lignocellulose
microbial degradation
biofuel
cellulose
lignin
hemicellulose
lignocellulolytic bacteria
Chryseobacterium gleum
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2018, 99, 2
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A cross sectional survey on health and nutritional status among the people of Chittagong city corporation, Bangladesh
Autorzy:
Jakaria, M.
Hasan, M.
Hossain, M.S.
Hasanat, A.
Sayeed, M.A.
Powiązania:
https://bibliotekanauki.pl/articles/1917281.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Medyczny w Białymstoku
Tematy:
Health
Chittagong city
nutritional status
survey
Respondents
Opis:
Purpose: To determine the health and nutritional status of people in the Chittagong city corporation area of Bangladesh. Materials and methods: A face-to-face interview methodology was used for this survey. The study sites were located in 15 thanas of the Chittagong city corporation area. The study was also designed with interview questions closely related to health.Results: Among the total 620 respondents, 453 respondents were males and 167 respondents were females. 471(75.96%) of the total respondents had positive comments about the health status of their community. 169(27.52%) respondents had poor or fair appetites but the rest of them had good, very good or excellent appetites. 360(58.07%) of the respondents reported they had been eating a minimum of one fruit per day and 85(13.7%) people drank 5 to 8 glasses of water daily. 441(71.12%) of their diets more or less met daily vitamin and nutrient requirements and 338(54.51%) were nonsmokers. 407(65.64%) were married, and 388 (62.58%) were more or less satisfied about their sexual life. 441(71.12%) respondents performed physical exercise more or less habitually. A lower number of respondents had a major disease. For instance, 155(25%) suffered from high blood pressure, and 150(24.19%) suffered from diabetes. In the case of minor diseases, 399(64.35%) of the respondents had been suffering from GIT disease and 416(67.09%) were taking proton pump inhibitors or a H2 receptor blockers. 205(33.06%) respondents were taking antibiotics regularly.Conclusions: One third of the people had hypertension and diabetes. According to the biomedical concepts, peoples were not healthy. However, according to the ecological and psychological concepts of health, this survey proved that the people of the Chittagong city corporation area were comparatively healthy.
Źródło:
Progress in Health Sciences; 2015, 5, 1; 114-119
2083-1617
Pojawia się w:
Progress in Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Properties of Carbon Nanotube (CNT) Reinforced Polyvinyl Alcohol (PVA) Composites
Autorzy:
Hasan, M.
Das, S. K.
Islam, J. M. M.
Gafur, Md. A.
Hoque, E
Khan, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/411675.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
CNT
PVA
composite
Thermal properties
Gum acacia
Opis:
Homogeneous Polyvinyl alcohol (PVA)/Carbon nanotube (CNT) composite has been prepared by solution casting method using gum acacia as a surfactant. CNT content in the composite was varied from 5-10 % by weight. The thermal properties of PVA/CNT composites were investigated by Thermo Gravimetric/Differential Thermal Analyzer (TG/DTA) and Thermo Mechanical Analyzer (TMA). TG/DTA results showed that higher thermal stability in higher percentage of CNT in the composites. The 10 % CNT containing PVA composite exhibit highest onset of melting, glass transition point and offset of melting temperature and the recoded values are 330.4K, 379K and 421.3K respectively. All of the result indicates that the developed PVA/CNT composite might be promising for use in solar cell application.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 12; 59-66
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigating the effects of nano-blast furnace slag powder on the behaviour of composite cement materials
Autorzy:
Kadhim, M. J.
Hasan, L. M.
Kamal, H. M.
Powiązania:
https://bibliotekanauki.pl/articles/24200642.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
environmentally friendly cement
nano-blast furnaces slag
cement substitute
compressive strength
water absorption
cement
żużel wielkopiecowy
substytut cementu
wytrzymałość na ściskanie
absorpcja wody
Opis:
Purpose Attributable to the depletion of raw materials and for sustainability purposes in construction works. Therefore, this study looked into the effects of nano blast furnace slag (BFS) on the microstructure, mechanical properties, and durability of mortar. BFS was substituted for cement at various weight percentages of 0, 1, 1.5, 3, 5, and 7%. Design/methodology/approach A suspension of water and Nano blast furnace slag was made using ultrasonic mixers to prepare the samples. The suspension was combined with cement and sand using 1 cement, 0.5 water, and 2.75 sand in the mixture to make cement mortar. The mixture was then shaped, left in the mould for 24 hours, and then allowed to cure for 7, 14, 28, 60, and 91 days. SEM was used to investigate the microstructure before and after cement replacement. The mechanical characteristics were evaluated by testing the compressive strength and the surface hardness. While the durability was assessed using the water absorption ratios. Findings The results revealed that increasing the BFS in the mortar improved mechanical characteristics and durability by up to 3% of BFS. Replacing Nano-blast furnace slag for a portion of the cement is a proposed solution to address the problems of environmental pollution and resource consumption caused by cement production. Research limitations/implications Another sustainable material needs to be used for additional investigation. We may evaluate more properties and use different weight percentages. Practical implications Each year, a significant amount of slag is produced as a result of the iron industry, endangering the environment. There have been numerous initiatives to reduce slag’s negative environmental consequences. Using slag to replace some of the cement is one of the options to eliminate this byproduct and reduce excessive cement use. Originality/value This study investigates the possibility of using a blast furnace blast within the Nanoscale to replace some of the cement used in the construction due to the positive impact on the environment to get rid of industrial byproducts and decrease the use of cement.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2023, 116, 1; 5--10
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of Electrically Conductive Nanocrystalline Thin Film for Optoelectronic Applications
Autorzy:
Das, S K.
Islam, J. M. M.
Hasan, M.
Kabir, H.
Gafur, Md. A.
Hoque, E.
Khan, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/412543.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Conductive thin film
Composite
TiO2
Solar cell
Optoelectronics
Sodium alginate
Opis:
Sodium alginate (TiO2) sand composites were prepared by solution casting. Purified sand was added in the composite films to increase electrical conductivity. Electrical properties such as conductivity, capacitance, dielectric constant, and loss tangent of the composites were investigated. The current voltage characteristics for all the composites showed ohmic behavior. All the electrical properties have been found to improve with the incorporation of sand (SiO2) but 6 % sand containing composite exhibits the best electrical properties. The mechanical properties tensile strength (TS), elongation at break (Eb) and Young modulus for 6 % sand containing composite film are found to be 4.445 MPa, 9.76 %, and 72.8 MPa respectively. The experimental results reveal that the blended films exhibit higher stability and improved mechanical properties of both tensile strength and elongation at break in dry state. Water absorption properties of the composites are found to decrease with the increase of sand content. Lowest water uptake properties and highest stability were demonstrated by 6 % sand containing sample. Electrically conductive composite films have useful applications for solar cells and optoelectronics. Thus, this study is very much expected to aid in the design and selection of proper composite for the potential application of solar cell and optoelectronics.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 10, 1; 90-101
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simple solution of time travel problems
Autorzy:
Majka, M.
Hasan, Md. K.
Majka, T. M.
Powiązania:
https://bibliotekanauki.pl/articles/134901.pdf
Data publikacji:
2015
Wydawca:
Tomasz Mariusz Majka
Tematy:
time travel
wormhole hypothesis
Minkowski light cone
event causality
grandfather paradox
philosophical perspective
Opis:
The most desired journey by human being is definitely travel through time. For centuries, people dream about time travel, to be able to go back and fix mistakes of the past. But there are many complications associated with time travel - starting from technological aspects ending with the philosophical paradoxes. Yet, is time travel possible from the technological and philosophical perspectives? How to solve the paradoxes of time travel? It should be noted that realisation of time travel leads not only to the discovery of the nature of time, but also to the understanding how much is unknown about it. In this paper, probability of time travel and solutions to paradoxes will be critically analysed from philosophical perspectives.
Źródło:
Journal of Education and Technical Sciences; 2015, 2, 1; 34-37
2300-7419
2392-036X
Pojawia się w:
Journal of Education and Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance analysis of cation and anion exchangers in water treatment plant: an industrial case study
Autorzy:
Ramzan, N.
Feroze, N.
Kazmi, M.
Ashraf, M. A.
Hasan, S.
Powiązania:
https://bibliotekanauki.pl/articles/779735.pdf
Data publikacji:
2012
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
krzywa przebicia
wymiana jonowa
uzdatnianie wody
breakthrough curves
degree of column utilization
ion exchange
water treatment
Opis:
Performance of cation and anion exchangers was evaluated by carrying out breakthrough analyses of pH, conductivity, free mineral acid (FMA) and various dissolved solids for an industrial water treatment plant of 700 gpm capacity. The breakthrough curves showed no leakage of calcium, magnesium and chloride throughout the operating period of the train, however, they indicated the early leakage of sodium, potassium, sulphate and silica. The operating/breakthrough capacity, total capacity and degree of column utilization were determined. The column utilization was found to be 67.85%, 38.93% and 16.78% against the design values of 90%, 85% and 85% for cation, primary and secondary anion exchangers respectively. The operating time of the water treatment train was significantly increased by achieving adequate capacity utilization of secondary anion exchanger. The low capacity utilization of secondary anion resin due to early silica slippage, has been discussed in the paper.
Źródło:
Polish Journal of Chemical Technology; 2012, 14, 2; 35-41
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics of Gillnet Fishing Gear and Vessel Construction in Fish Landing Base of Karangsong, Indramayu, Indonesia
Autorzy:
Apriliani, Izza M.
Hasan, Zahidah
Junianto, Junianto
Kusnadi, Nadia Maudina
Powiązania:
https://bibliotekanauki.pl/articles/1076849.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
construction
fishing ports
fishing units
gillnetter
millenium net
Opis:
This research study was intended to provide information in order to model an ideal construction of Gillnet fishing practices in PPI Karangsong, in order to support the feasibility of optimum catch. Fish Landing Base (PPI) Karangsong is the most active fishing port in Indramayu. The dominant fishing activity in the Karangsong PPI is gillnet fishing at around 71.4% of the total fishing units. The type of gillnet utilized in Indramayu is commonly called the ‘gillnet millennium’ and it is constructed out of Poly Amide monofilament. The gillnet vessel itself has a hull shaped in the form of a hard chin bottom. Based on this research, it can be concluded that each region has specific fishing unit characteristics that vary in accordance with the conditions of the waters.
Źródło:
World News of Natural Sciences; 2019, 23; 75-83
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Orange Peels as a Sustainable Material for Treating Water Polluted with Antimony
Autorzy:
Hasan, Manar B.
Al-Tameemi, Israa M.
Abbas, Mohammed N.
Powiązania:
https://bibliotekanauki.pl/articles/1839075.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
antimony treatment
antimony adsorption
polluted water
orange peel
low-cost material
Opis:
Water pollution has increased due to human activities; consequently, it is essential to treat both surface water and ground water so they are suitable to meet the needs of the population. This study will discuss water treatment intended to remove antimony. Antimony (Sb) is classed as a high-priority toxic pollutant because of its adverse effects on ecosystems and human health. There are several methods for removing antimony from water, including adsorption, coagulation, ion exchange, and electrochemical treatment. This study focuses on the adsorption method as researchers have, in recent times, been seeking adsorbents that are environmentally friendly and cost-effective and that do not leave a residue. The study investigates the use of orange peels treated with acetic acid as an adsorbent to remove antimony ions from a simulated aqueous solution. The results revealed that 5 g of treated orange peels is 98.5% effective at treating water at a pH of 6, for a contact time of 150 minutes, at a mixing speed of 450 rpm.
Źródło:
Journal of Ecological Engineering; 2021, 22, 2; 25-35
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Trace elements in scalp hair of leukaemia patients
Autorzy:
Khuder, A.
Bakir, M. A.
Hasan, R.
Mohammad, A.
Habil, K.
Powiązania:
https://bibliotekanauki.pl/articles/971518.pdf
Data publikacji:
2014
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
leukaemia
principal component analysis
scalp hair
U-test
X-ray fluorescence
Opis:
The aim of this study was to determine the concentration of Fe, Ni, Cu, Zn and Pb in scalp hair of leukaemia patients and healthy volunteers, using the optimised XRF method. Leukaemia hair samples were classifi ed corresponding to type, growth and age of the participants. The results showed that the studied trace elements (TEs) in both of leukaemia and control groups were positively skewed. In comparison with the control group, lower Fe, Cu, Zn and Pb and higher of Ni medians were found in all studied leukaemia patients. The median rank obtained by Mann–Whitney U-test revealed insignifi cant differences between the leukaemia patients subgroups and the controls. An exact probability (α < 0.05) associated with the U-test showed signifi cant differences between medians in leukaemia patients and controls groups for Pb (lymphatic/control, acute/control), Cu (lymphatic/control, chronic/control), Ni (lymphatic/control, chronic/control) and Fe (chronic/control). Very strong positive and negative correlations (r > 0.70) in the scalp hair of control group were observed between Ni/Fe-Ni, Cu/Fe-Cu, Zn/Fe-Zn, Pb/Fe-Pb, Cu/Ni-Zn/Ni, Cu/Ni-Pb/Ni, Zn/Ni-Pb/Ni, Zn/Fe-Zn/Cu, Pb/Ni-Ni and Ni/Fe-Pb/Ni, whereas only very strong positive ratios in the scalp hair of leukaemia patients group were observed between Ni/Fe-Ni, Cu/Fe-Cu, Zn/Fe-Zn and Pb/Fe-Pb, all correlations were signifi cant at p < 0.05. Other strong and signifi cant correlations were also observed in scalp hair of both groups. Signifi cant differences between grouping of studied TEs in all classifi ed leukaemia groups and controls were found using principal component analysis (PCA). The results of PCA confi rmed that the type and the growth of leukaemia factors were more important in element loading than the age factor.
Źródło:
Nukleonika; 2014, 59, 3; 111-120
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Survey Addressing on High Performance On-Chip VLSI Interconnect
Autorzy:
Mohamed Yousuff, C.
Mohamed Yousuf Hasan, V.
Khan Galib, M. R.
Powiązania:
https://bibliotekanauki.pl/articles/226784.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
current-mode signaling
hybrid current/voltage mode circuits
on-chip interconnects delay and power
voltage mode signaling
Opis:
With the rapid increase in transmission speeds of communication systems, the demand for very high-speed lowpower VLSI circuits is on the rise. Although the performance of CMOS technologies improves notably with scaling, conventional CMOS circuits cannot simultaneously satisfy the speed and power requirements of these applications. In this paper we survey the state of the art of on-chip interconnect techniques for improving performance, power and delay optimization and also comparative analysis of various techniques for high speed design have been discussed.
Źródło:
International Journal of Electronics and Telecommunications; 2013, 59, 3; 307-312
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
COVID-19 Pandemic: A Motive for Pro-Environmental Behaviors (Pebs) in the Egyptian Tourism and Hospitality Industry
Autorzy:
Elshaer, Abdallah M.
Al-Abyadh, Mohammed Hasan Ali
Alsetoohy, Omar
Marzouk, Asmaa M.
Agina, Mohamed Fathy
Powiązania:
https://bibliotekanauki.pl/articles/2174911.pdf
Data publikacji:
2022
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
pro-environmental behavior
employee behaviour
COVID-19 pandemic
green hotel
travel agency
Opis:
Academics have been curious about what motivates pro-environmental behaviour. However, a few research studies have been conducted to analyse and comprehend the pro-environmental behaviour of those in charge of service and production (employees). The COVID-19 outbreak highlighted this topic, emphasising the significance of employees’ pro-environmental behaviours (PEBs) in promoting and maintaining business sustainability. Therefore, this study contributes to the body of knowledge by investigating employees’ PEBs during the COVID-19 pandemic. In-person and online surveys were used to reach the staff of hotels and travel agencies in Egypt’s most popular tourist areas. The quantitative data were analysed with SPSS 25. The results revealed that employees of the tourism and hospitality industry are exceptionally engaged in PEBs in times of the COVID-19 pandemic. Also, the findings indicate that the structure of tourism and hospitality employees’ PEB comprises six factors: operation activities, habits, organisation rules, health, energy-saving, and environment-related activities. However, their behaviour must be guided and improved in three key areas (personal health, organisational rules, and operation activities). According to this study, employees may follow certain practices without understanding their justification or significance. In practice, the study presents recommendations that might increase the industry’s resistance to challenges in improving the pro-environmental behaviour of industry employees.
Źródło:
Rocznik Ochrona Środowiska; 2022, 24; 415--438
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heavy Metals Removal from Simulated Wastewater using Horizontal Subsurface Constructed Wetland
Autorzy:
M-Ridha, Mohanad J.
Zeki, Suhair L.
Mohammed, Sabah J.
Abed, Khalid M.
Hasan, Hassimi Abu
Powiązania:
https://bibliotekanauki.pl/articles/1955516.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
heavy metal removal
phytoremediation
horizontal subsurface constructed wetland
Nerium oleander
waste treatment
Opis:
This study aimed to assess the efficiency of Nerium oleander in removing three different metals (Cd, Cu, and Ni) from simulated wastewater using horizontal subsurface flow constructed wetland (HSSF-CW) system. The HSSF-CW pilot scale was operated at two hydraulic retention times (HRTs) of 4 and 7 days, filled with a substrate layer of sand and gravel. The results indicated that the HSSF-CW had high removal efficiency of Cd and Cu. A higher HRT (7 days) resulted in greater removal efficiency reaching up to (99.3% Cd, 99.5% Cu, 86.3% Ni) compared to 4 days. The substrate played a significant role in removal of metals due to adsorption and precipitation. The N. oleander plant also showed a good tolerance to the uptake of Cd, Cu, and Ni ions from water. The highest removal of the heavy metals indicated that the HSSF-CW would be a promising technology for heavy metal contaminated wastewater as well as in electroplating and manufacturing industries.
Źródło:
Journal of Ecological Engineering; 2021, 22, 8; 243-250
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research the effect of the fractional number slots of pole on wind turbine generation using the enhanced spotted hyena optimization algorithm
Badanie wpływu ułamkowej liczby szczelin biegunów na generację turbiny wiatrowej przy użyciu ulepszonego algorytmu optymalizacjicętkowanej hieny
Autorzy:
Aladwan, Ibrahim M.
AL Dabbas, Hasan Abdelrazzaq
Maqableh, Ayman. M.
Fayyad, Sayel M.
Miroshnyk, Oleksandr
Shchur, Taras
Ptashnyk, Vadym
Powiązania:
https://bibliotekanauki.pl/articles/27315448.pdf
Data publikacji:
2023
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
wind turbine generation
optimal slot
pole
ESHO algorithm
generacja turbiny wiatrowej
optymalna szczelina
biegun
algorytm ESHO
Opis:
The design of machines with permanent magnets is actively developing day by day and is often used in wind energy. The main advantages of such variable speed drives are high efficiency, high power density and torque density. When designing a wind generator with two rotors and permanent magnets, it is necessary to solve such a problem as the correct choice of the number of poles and slots to increase efficiency and minimize the cost of the machine. In this work, an improved spotted hyena optimization algorithm is used to obtain the optimal combination of slots and poles. This optimization algorithm makes it possible to obtain the number of fractional slots per pole and evaluate the operating efficiency of a wind generator with a double rotor and ferrite magnets. At the first stage of machine design, various combinations of slots are installed. Next, the optimal combination is selected from various slot-pole combinations, taking into account the Enhanced Spotted Hyena Optimization (ESHO) algorithm, in which a multiobjective function is configured. Accordingly, the multi-objectives are the integration of reverse electromotive force, output torque, gear torque, flux linkage, torque ripple along with losses. Analysis of the results obtained shows that the proposed algorithm for determining the optimal slot combination is more efficient than other slot combinations. It has also been found that the choice of slot and pole combination is critical to the efficient operation of permanent magnet machines.
Projektowanie maszyn z magnesami trwałymi aktywnie rozwija się z dnia na dzień i jest często wykorzystywane w energetyce wiatrowej. Głównymi zaletami takich napędów o zmiennej prędkości są wysoka sprawność, wysoka gęstość mocy i gęstość momentu obrotowego. Podczas projektowania generatora wiatrowego z dwoma wirnikami i magnesami trwałymi konieczne jest rozwiązanie takiego problemu, jak prawidłowy dobór liczby biegunów i szczelin w celu zwiększenia wydajności i zminimalizowania kosztów maszyny. W niniejszej pracy zastosowano ulepszony algorytm optymalizacji hieny plamistej w celu uzyskania optymalnej kombinacji szczelin i biegunów. Ten algorytm optymalizacji umożliwia uzyskanie liczby ułamkowych szczelin na biegun i ocenę wydajności operacyjnej generatora wiatrowego z podwójnym wirnikiem i magnesami ferrytowymi. Na pierwszym etapie projektowania maszyny instalowane są różne kombinacje szczelin. Następnie wybierana jest optymalna kombinacja spośród różnych kombinacji szczelin i biegunów, biorąc pod uwagę algorytm Enhanced Spotted Hyena Optimization (ESHO) (ulepszony algorytm optymalizacjihieny cętkowanej hieny), w którym skonfigurowana jest funkcja wielocelowa. W związku z tym, celami wielozadaniowymi są integracja odwrotnej siły elektromotorycznej, wyjściowego momentu obrotowego, momentu obrotowego przekładni, połączenia strumienia, tętnienia momentu obrotowego wraz ze stratami. Analiza uzyskanych wyników pokazuje, że proponowany algorytm określania optymalnej kombinacji szczelin jest bardziej wydajny niż inne kombinacje szczelin. Stwierdzono również, że wybór kombinacji szczelin i biegunów ma kluczowe znaczenie dla wydajnej pracy maszyn z magnesami trwałymi.
Źródło:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2023, 13, 3; 94--100
2083-0157
2391-6761
Pojawia się w:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simultaneous Adsorption of Ternary Antibiotics (Levofloxacin, Meropenem, and Tetracycline) by SunFlower Husk Coated with Copper Oxide Nanoparticles
Autorzy:
Ibrahim, Mohammed A.
Shaban, Mohammed Ali A.
Hasan, Yaseen Rashid
M-Ridha, Mohanad J.
Hussein, Haitham A.
Abed, Khalid M.
Mohammed, Sabah J.
Muhamad, Mohd Hafizuddin
Hasan, Hassimi Abu
Powiązania:
https://bibliotekanauki.pl/articles/2105287.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
adsorption
antibiotics
neural network
wastewater
sustainable process
Opis:
In this study, a new adsorbent derived from sunflower husk powder and coated in CuO nanoparticles (CSFH) was investigated to evaluate the simultaneous adsorption of Levofloxacin (LEV), Meropenem (MER), and Tetracycline (TEC) from an aqueous solution. Significant improvements in the adsorption capacity of the sunflower husk were identified after the powder particles had been coated in CuO nanoparticles. Kinetic data were correlated using a pseudo-second-order model, and was successful for the three antibiotics. Moreover, high compatibility was identified between the LEV, MER, and TEC, isotherm data, and the Langmuir model, which produced a better fit to suit the isotherm curves. In addition, the spontaneous and exothermic nature of the adsorption process was crucial for transforming the three antibiotics into CSFH. The greatest CSFH adsorption capacity was in MER (131.83 mg/g), followed by TEC (96.95 mg/g), and LEV (62.24 mg/g). These findings thus indicate that CSFH is one of the most effective and efficient adsorbents to use for eliminating wastewater contaminated with antibiotic residue.
Źródło:
Journal of Ecological Engineering; 2022, 23, 6; 30--42
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
MHD mixed convection in copper-water nanofluid filled lid-driven square cavity containing multiple adiabatic obstacles with discrete heating
Autorzy:
Gorla, R. S. R.
Siddiqa, S.
Hasan, A. A.
Salah, T.
Rashad, A. M.
Powiązania:
https://bibliotekanauki.pl/articles/265383.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
nanociecze
konwekcja mieszana
magnetohydrodynamika
nanofluid
mixed convection
magnetohydrodynamics
square cavity
adiabatic obstacles
Opis:
The objective of the present work is to investigate the influence of nanoparticles of copper within the base fluid (water) on magneto-hydrodynamic mixed-convection flow in a square cavity with internal generation. A control finite volume method and SIMPLER algorithm are used in the numerical calculations. The geometry is a lid-driven square cavity with four interior square adiabatic obstacles. A uniform heat source is located in a part of the left wall and a part of the right wall of the enclosure is maintained at cooler temperature while the remaining parts of the two walls are thermally insulated. Both the upper and bottom walls of the cavity are considered to be adiabatic. A comparison with previously published works shows a very good agreement. It is observed that the Richardson number, Ri, significantly alters the behavior of streamlines when increased from 0.1 to 100.0. Also, the heat source position parameter, D, significantly changes the pattern of isotherms and its strength shifted when D moves from 0.3 to 0.7.
Źródło:
International Journal of Applied Mechanics and Engineering; 2020, 25, 2; 57-74
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Responses of maize varieties to salt stress in relation to germination and seedling growth
Autorzy:
Hassan, N.
Hasan, Md.K.
Shaddam, Md.O.
Islam, M.S.
Barutcular, C.
EL Sabagh, A.
Powiązania:
https://bibliotekanauki.pl/articles/11757.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Źródło:
International Letters of Natural Sciences; 2018, 69
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Groundwater Contamination and Health Risk Evaluation of Naturally Occurring Potential Toxic Metals of Hatiya Island, Bangladesh
Autorzy:
Rahman, Mahfuzur
Khan, Md. Sadril Islam
Hossain, Mohammad Sabbir
Hossain, Md. Imam Shohel
Hasan, Mahmudul
Hamli, Hadi
Mustafa, M. Golam
Powiązania:
https://bibliotekanauki.pl/articles/2105279.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
drinking water
toxic elements
pollution indices
Hatiya Island
Opis:
Groundwater meets the majority portion of drinking water needs, particularly in the rural area of Bangladesh. Groundwater has been continuously contaminated by potentially harmful metals as a result of natural processes as well as some anthropogenic activities, creating a variety of health impacts. The current research aimed to evaluate the naturally occurring level of metal contamination and the human health risk associated with deep groundwater in the Hatiya Island. Because of the arsenic, iron, and salinity problem in shallow groundwater, the inhabitants of the Hatiya Island use deep groundwater. During the field investigation, no shallow tubewells were observed; therefore, only deep groundwater samples were collected. The total sample size collected throughout the Hatiya island was 17. Five metals (Zn, Fe, Mg, Mn, and Cu) were analyzed using an Atomic Absorption Spectrophotometer (AAS). The concentrations of studied potential risky metals were ranked as follows: Mg > Zn > Fe >Mn> Cu. The detected values of all metals except Fe were found within the drinking water limits of WHO (2017), BIS (2012), and BDWS (1997), where only 29.41% of the Fe sample exceeded the standard drinking limits. According to the metal evaluation index (MEI) and degree of contamination (Cd), the groundwater of the study area is free from contamination but the metal pollution index (MPI) and nemerow pollution index (NI) exhibited little pollution in the mid-western part of the study area. The hazard quotient (HQ) values revealed no oral and dermal health risk for individual metals (Cu, Zn, Fe, Mn). On the other hand, the hazard index (HI) values exhibited no risk for combined metals as none of the values exceeded the safety limit value of 1. According to the HQ and HI results, the deep groundwater on Hatiya Island is non-carcinogenic and risk-free for children and adults. However, children were more susceptible to oral health risks than adults. In contrast, adults were more vulnerable to dermal health risks than children.
Źródło:
Journal of Ecological Engineering; 2022, 23, 6; 223--236
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Growth Kinetics and Toxicity of Pseudomonas fredriksbergsis Grown on Phenol as Sole Carbon Source
Autorzy:
Aljbour, Salah H.
Khleifat, Khaled M.
Al Tarawneh, Amjad
Asasfeh, Batool
Qaralleh, Haitham
El-Hasan, Tayel
Magharbeh, Mousa K.
Al-Limoun, Muhamad O.
Powiązania:
https://bibliotekanauki.pl/articles/2027891.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
phenol
biodegradation
Pseudomonas fredriksbergsis
Haldane model
GC-MS
Opis:
Phenol is one of the main pollutants that have a serious impact on the environment and can even be very critical to human health. The biodegradation of phenol can be considered an increasingly important pollution control process. In this study, the degradation of phenol by Pseudomonas fredriksbergsis was investigated for the first time under different growth conditions. Six different initial concentrations of phenol were used as the primary substrate. Culture conditions had an important effect on these cells' ability to biodegrade phenol. The best growth of this organism and its highest biodegradation level of phenol were noticed at pH 7, temperature 28 °C, and periods of 36 and 96 h, respectively. The highest biodegradation rate was perceived at 700 mg/L initial phenol concentration. Approximately 90% of the phenol (700 mg/L) was removed in less than 96 hours of incubation time. It was found that the Haldane model best fitted the relationship between the specific growth rate and the initial phenol concentration, whereas the phenol biodegradation profiles time could be adequately described by the modified Gompertz model. The parameters of the Haldane equation are: $0.062 h^{−1}$, 11 ppm, and 121 ppm for Haldane’s maximum specific growth rate, the half-saturation coefficient, and the Haldane’s growth kinetics inhibition coefficient, respectively. The Haldane equation fitted the experimental data by minimizing the sum of squared error (SSR) to $1.36×10^{-3}$.
Źródło:
Journal of Ecological Engineering; 2021, 22, 10; 251-263
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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