Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "Mohd, A." wg kryterium: Autor

  Lista filtrów
Wyrównaj
Wyświetlanie 1-15 z 26
Tytuł:
Silica Bonding Reaction on Fly Ash Based Geopolymer Repair Material System with Incorporation of Various Concrete Substrates
Autorzy:
Al Bakri Abdullah, Mohd Mustafa
Aziz, Ikmal Hakem A.
Zailani, Warid Wazien Ahmad
Rahim, Shayfull Zamree Abd
Yong, Heah Cheng
Sandu, Andrei Victor
Peng, Loke Siu
Powiązania:
https://bibliotekanauki.pl/articles/2174557.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fly ash geopolymer
repair material
concrete substrate
interfacial zone transition
Opis:
This paper presents an experimental investigation on the mechanical properties and microstructure of geopolymer repair materials mixed using fly ash (FA) and concrete substrates. An optimal combination of FA and concrete substrate was determined using the compressive test of geopolymer mortar mixed with various concrete substrate classes. It was found that the contribution of (C35/45) concrete substrates with the FA geopolymer mortar increases the 28-day bonding strength by 25.74 MPa. The microstructure analysis of the samples using scanning electron microscopy showed the denser structure owing to the availability of high calcium and iron elements distribution. These metal cations (Ca2+ and Fe3+) are available at OPC concrete substrate as a result from the hydration process reacted with alumina-silica sources of FA and formed calcium aluminate silicate hydrate (C-A-S-H) gels and Fe-bonding linkages.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 4; 1277--1281
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of Zeolite Phase Made from Rice Husk Ash and Sidrap Clay
Autorzy:
Armayani, M.
Mansur, Musdalifa
Asra, Reza
Irwan, Muh
Ramadhanty, Dhian
Subaer, Subaer
Abdullah, Mohd Mustafa Al Bakri
Aziz, Ikmal Hakem A.
Jeż, Bartłomiej
Nabiałek, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/2203746.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
autoclave
clay
rice husk ash
zeolite
Opis:
Zeolite has been successfully synthesized from clay and rice husk ash in the form of powder by using the hydrothermal method with variations in chemical compositions of alkaline solution and the amount of rice husk ash. The clay raw material was obtained from the Sidrap area of South Sulawesi and rice husk ash is obtained from the burning pile of rice husks. Sidrap clay and rice husk ash were activated using an alkaline solution of NaOH and varied rice husk ash and the addition of AlCl3. The addition of AlCl3, an alkaline solution of NaOH and H2O was used in the amount of 25.5 grams and variations of rice husk ash were 2.5 grams and 6.5 grams. Meanwhile, without the addition of AlCl3, an alkaline solution of NaOH and H2O was used for 20.5 grams and variations of rice husk ash from 2.5 grams and 6.5 grams. Then the mixture was then put into an autoclave with a temperature of 100°C for 3 hours. The basic material used in the manufacture of zeolite is carried out by X-ray Fluorescence (XRF) characterization to determine the constituent elements of basic material, which showed the content of SiO2 was 45.80 wt% in the clay and 93.40% in the rice husk ash. The crystalline structure of the zeolite formed was characterized by X-Ray Diffraction (XRD). It was found the resulting zeolite were identified as Zeolite-Y, Hydrosodalite, and ZSM-5. The microstructure properties of the resulting zeolite were determined by using Scanning Electron Microscopy (SEM).
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 269--274
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Naoh Molar Concentration on Microstructure and Compressive Strength of Dolomite/Fly Ash-Based Geopolymers
Autorzy:
Azimi, Emy Aizat
Salleh, Mohd M. A. A.
Abdullah, Mohd Mustafa Al Bakri
Aziz, Ikmal Hakem A.
Hussin, Kamarudin
Chaiprapa, Jitrin
Vizureanu, Petrica
Yoriya, Sorachon
Nabiałek, Marcin
Wyslocki, Jerzy J.
Powiązania:
https://bibliotekanauki.pl/articles/2125545.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dolomite/fly ash
geopolymer
NaOH concentration
synchrotron
micro-XRF
Opis:
Dolomite can be used as a source of aluminosilicate to produce geopolymers; however, this approach is limited by its low reactivity. This study analyzes the viability of producing geopolymers using dolomite/fly-ash with sodium silicate and NaOH solutions (at multiple concentrations) by determining the resultant geopolymers’ compressive strengths. The dolomite/fly-ash-based geopolymers at a NaOH concentration of ~22 M resulted in an optimum compressive strength of 46.38 MPa after being cured for 28 days, and the SEM and FTIR analyses confirmed the denser surface of the geopolymer matrix. The synchrotron micro-XRF analyses confirmed that the Ca concentration exceeded that of Si and Mg, leading to the formation of calcium silicate hydrate, which strengthens the resulting geopolymers.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 3; 993--998
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Crumb rubber geopolymer mortar at elevated temperature exposure
Autorzy:
Azmi, Ahmad Azrem
Abdullah, Mohd Mustafa Al Bakri
Ghazali, Che Mohd Ruzaidi
Ahmad, Romisuhani
Jaya, Ramadhansyah Putra
Rahim, Shayfull Zamree Abd
Almadani, Mohammad A.
Wysłocki, Jerzy J.
Śliwa, Agata
Sandu, Andrei Victor
Powiązania:
https://bibliotekanauki.pl/articles/2173997.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
popiół lotny
zaprawa geopolimerowa
okruchy gumy
temperatura podwyższona
narażenie
fly ash
geopolymer mortar
crumb rubber
elevated temperature
exposure
Opis:
Low calcium fly ash is used as the main material in the mixture and the crumb rubber was used in replacing fine aggregates in geopolymer mortar. Sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) which were high alkaline solution were incorporated as the alkaline solution. The fly ash reacted with the alkaline solution forming alumino-silicate gel that binds the aggregate to produce a geopolymer mortar. The loading of crumb rubber in the fly ash based geopolymer mortar was set at 0% (CRGM-0), 5% (CRGM-5), 10% (CRGM-10), 15% (CRGM-15), and 20% (CRGM-20), respectively. NaOH solution (12M) and Na2SiO3 solution ratio is set constant at 2.5 for all geopolymer mixture and the fly ash to alkali activator ratio was kept at 2.0. The CRGM at 28 days of curing time was exposed to elevated temperature at 200ºC, 400ºC, 600ºC and 800ºC. The weight loss of the CRGM increases with increasing temperature at all elevated temperatures. However, the density and compressive strength of CRGM decrease with an increase of crumb rubber loading for all elevated temperature exposure. The compressive strength of CRGM reduced due to the fact that rubber decomposes between 200ºC and 600ºC thereby creating voids. CRGM-15 and CRGM-20 showed cracks developed with rough surface at 800ºC. Image obtained from scanning electron microscope (SEM) showed that, the CRGM changed significantly due to the decomposition of crumb rubber and evaporation of the free water at 400ºC, 600ºC and 800ºC.
Źródło:
Archives of Civil Engineering; 2022, 68, 3; 87--105
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficient online handwritten Chinese character recognition system using a two-dimensional functional relationship model
Autorzy:
Chang, Y. F.
Lee, J. C.
Mohd Rijal, O.
Syed Abu Bakar, S. A. R.
Powiązania:
https://bibliotekanauki.pl/articles/908140.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
2D
współczynnik determinacji
rozpoznawanie
pismo odręczne
pismo chińskie
falka Haara
model relacyjny
2D functional classifier
coefficient of determination
handwritten Chinese character recognition
Haar wavelet
multidimensional functional relationship model
Opis:
This paper presents novel feature extraction and classification methods for online handwritten Chinese character recognition (HCCR). The X-graph and Y-graph transformation is proposed for deriving a feature, which shows useful properties such as invariance to different writing styles. Central to the proposed method is the idea of capturing the geometrical and topological information from the trajectory of the handwritten character using the X-graph and the Y-graph. For feature size reduction, the Haar wavelet transformation was applied on the graphs. For classification, the coefficient of determination [...] from the two-dimensional unreplicated linear functional relationship model is proposed as a similarity measure. The proposed methods show strong discrimination power when handling problems related to size, position and slant variation, stroke shape deformation, close resemblance of characters, and non-normalization. The proposed recognition system is applied to a database with 3000 frequently used Chinese characters, yielding a high recognition rate of 97.4% with reduced processing time of 75.31%, 73.05%, 58.27% and 40.69% when compared with recognition systems using the city block distance with deviation (CBDD), the minimum distance (MD), the compound Mahalanobis function (CMF) and the modified quadratic discriminant function (MQDF), respectively. High precision rates were also achieved.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2010, 20, 4; 727-738
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bioaccumulation of Heavy Metals in Mackerel and Red Hybrid Tilapia Collected From
Autorzy:
Dabwan, Ahmed H. A.
Saluddin, Ummu Asma’ Hafifah Bt. Mohmad
Isa, Nursuhaili Bt. Mohd
Abdullah, Abdul Hadi
Mohamed, Amri Bin Hj.
Ahmad, Anuar Bin
Powiązania:
https://bibliotekanauki.pl/articles/27314829.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
heavy metals
biomonitoring
oreochromis niloticus
Rastrelliger kanagurta
Oreochromis niloticus
metale ciężkie
ekosystem morski
makrela indyjska
tilapia
Opis:
The major goal of this study is to determine the bioaccumulation of heavy metals in the tissues and bones of Red Hybrid Tilapia (Oreochromis niloticus) and Mackerel (Rastrelliger kanagurta) taken from two distinct sites in Terengganu state, Malaysia, namely Kijal and Paka. Zinc (Zn), copper (Cu), nickel (Ni), and lead (Pb)were the metals examined. Soil analysis also was carried out for the same elements. The tissues and bones of the fishes were separated before further analysis was made. Drying process technique was used to determine the moisture content for all samples at 80°C for 24 hours. Water content ranged between 70 & 77%. Triplicate samples were evaluated by using Atomic Absorption Spectrophotometer (AAS) to find out heavy metals concentration. Oven and Teflon beakers were used to fully digest all solid samples at 120oC for 3 hours. Highest readings of Zn, Ni and Pb were found in the fish bone for the samples collected from both mentioned locations. However, different pattern was noticed for Cu where higher values were found in the tissues for the same samples. Values of Pb in the tissues were higher than the acceptable value in edible fish by Food and Agriculture Organization (FAO); 1 ppm and Malaysian Food Act (MFR) & World Health Organization (WHO); 2 ppm, whereas values of Cu, Zn were in the acceptable range set by the same organizations. No values recommended for Ni by MFR. In general heavy metals in the bones and tissues from both locations can be sorted in descending order as follows; Pb>Zn>Cu>Ni. Soil samples collected from both locations showed different pattern where high concentration was found for Zn followed by Pb then Cu and Ni. Moreover analysis for soil samples collected from Paka River showed higher content for all elements compared to Kijal. More investigation is needed to clarify whether this contamination is solely from industry or due to geology of the area.
Źródło:
Civil and Environmental Engineering Reports; 2022, 32, 4; 270--281
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of SnO2/TiO2 with the Addition of Polyethylene Glycol via Sol-Gel Method for Self-Cleaning Application
Autorzy:
Halin, Dewi Suriyani Che
Azliza, Azani
Razak, Kamrosni Abdul
Abdullah, Mohd Mustafa Al Bakri
Salleh, Mohd Arif Anuar Mohd
Wahab, Juyana A
Chobpattana, Varistha
Kaczmarek, Łukasz
Nabiałek, Marcin
Jeż, Bartłomiej
Powiązania:
https://bibliotekanauki.pl/articles/2203743.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
TiO2
SnO2
thin film
polyethylene glycol
self-cleaning
Opis:
TiO2 is one of the most widely used metal oxide semiconductors in the field of photocatalysis for the self-cleaning purpose to withdraw pollutants. Polyethylene glycol (PEG) is recommended as a stabilizer and booster during preparation of water-soluble TiO2. Preparation of SnO2/TiO2 thin film deposition on the surface of ceramic tile was carried out by the sol-gel spin coating method by adding different amount of PEG (0g, 0.2g, 0.4g, 0.6g, 0.8g) during the preparation of the sol precursor. The effects of PEG content and the annealing temperature on the phase composition, crystallite size and the hydrophilic properties of SnO2/TiO2 films were studied. The X-ray diffraction (XRD) spectra revealed different phases existed when the films were annealed at different annealing temperatures of 350°C, 550°C and 750°C with 0.4 g of PEG addition. The crystallite sizes of the films were measured using Scherrer equation. It shows crystallite size was dependent on crystal structure existed in the films. The films with mixed phases of brookite and rutile shows the smallest crystallite size. In order to measure the hydrophilicity properties of films, the water contact angles for each film with different content of PEG were measured. It can be observed that the water contact angle decreased with the increasing of the content of PEG. It shows the superhydrophilicity properties for the films with the 0.8 g of PEG annealed at 750°C. This demonstrates that the annealed temperature and the addition of PEG affect the phase composition and the hydrophilicity properties of the films.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 243--248
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
SYNTHESIS, AND EVALUATION OF COUMARIN HYBRIDS AS ANTIMYCOBACTERIAL AGENTS
Autorzy:
Hassan, Mohd Z.
ALSAYARI, ABDULRHMAN
OSMAN, HASNAH
ALI, MOHAMED A.
MUHSINAH, ABDULLATIF B.
AHSAN, MOHAMED J.
Powiązania:
https://bibliotekanauki.pl/articles/895509.pdf
Data publikacji:
2019-12-29
Wydawca:
Polskie Towarzystwo Farmaceutyczne
Tematy:
cytotoxicity
Coumarin
TB
Thiazolopyrimidine
HTS
antimycobacterial
Opis:
A series of twelve hybrid coumarin analogues were synthesized and screened through HTS for their antimycobacterial activity against Mtb H37Rv. The hybrid molecules were efficiently synthesized by the reactions of 3-(bromoacetyl)coumarin with Biginelli products 2-mercapto-6-oxo-4-aryl-1,6-dihydropyrimidine-5-carbonitriles. Of the resulting twelve hybrids, the two compounds 7-(2,4-dichlorophenyl)-5-oxo-3-(2-oxo-2H-chromen-3-yl)-5H-thiazolo[3,2-a] pyrimidine-6-carbonitrile (3d) and 7-(4-nitrophenyl)-5-oxo-3-(2-oxo-2H-chromen-3-yl)-5H-thiazolo[3,2-a]pyrimidine-6-carbonitrile (3f) showed excellent antimycobacterial activity against Mtb (EC50 3.19 & 7.91 µM, respectively) and low cytotoxicity against the VERO cell line (IC50 > 62.5 µg/mL).
Źródło:
Acta Poloniae Pharmaceutica - Drug Research; 2019, 76, 6; 1029-1036
0001-6837
2353-5288
Pojawia się w:
Acta Poloniae Pharmaceutica - Drug Research
Dostawca treści:
Biblioteka Nauki
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:
Removal of Cadmium using Alkaline-Treated Activated Carbon from Leucaena Leucocephala Biomass
Autorzy:
Ibrahim, W. M. H. W.
Sulaiman, Nurul Syuhada
Amini, Mohd Hazim Mohammad
Kadir, W. R. A.
Mohamed, Mazlan
Ramle, Sitti Fatimah Mhd
Bilgin, Ugur
Rahman, Wan
Powiązania:
https://bibliotekanauki.pl/articles/2125550.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
activated carbon
cadmium
Leucaena leucocephala
adsorption
Opis:
Water contamination that caused by heavy metals is a very common phenomenon in the industrial age. One of the popular way to treat metal contaminated water is by adsorption process using activated carbon as the adsorbent. This paper works on producing activated carbon by chemical means with impregnation ratios of NaOH:char (w/w) was predetermined at 1:1 (ACT1-1), 2:1 (ACT2-1) and 3:1 (ACT3-1) under activation temperature of 700°C. Considering the Leucaena leucocephala is a wildly, easy and fast grown species, with the availability throught the year, it was chosen to be used as the precursor. The properties of these activated carbons and its potential for cadmium removal from aqueus solution was analyzed. It was found that the highest surface area was recorded at 662.76 m²/g. Four parameters were studied which are contact time, the effect of pH, initial concentration of adsorbate and temperature. The equilibrium time was achieved in 40 min treatment at initial concentrations of 30 mg/l. The adsorbent exhibited good sorption potential for cadmium at pH 8.0 and equilibrium temperature of 30℃. Based on the results, this study had proved that activated carbon from Leucaena leucocephala biomass have the good potential to be used for removal of cadmium from wastewater.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 3; 1033--1036
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of the optode array representation using optical properties at systole and diastole
Autorzy:
Jumadi, N A
Beng, G K
Mohd-Ali, M. A.
Zahedi, E
Powiązania:
https://bibliotekanauki.pl/articles/173805.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
optical simulation
optical properties
optode array
semi-infinite tissue layer
statistical
analysis
Opis:
The necessity to develop an optode array in order to probe the fetus oxygenation noninvasively regardless of the fetus position has been highlighted in previous literature. In this paper, a series of optical simulations are carried out to determine the best representation of optode array by using optical properties at systolic and diastolic states. The selection is based on the highest flux values accumulated at respective detectors. To accomplish the objective, a homogenous three-layer semi-infinite tissue model is implemented to represent the pregnant woman model. The geometry of the model as well as Monte Carlo simulation are carried out using commercial software, whereas the optical properties related to systolic and diastolic states are defined for all wavelengths. A statistical noise analysis is also introduced in order to find a sufficient number of rays to be launched into the optical tissue system.
Źródło:
Optica Applicata; 2013, 43, 4; 747-759
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of kenaf loading on kenaf/ABS composites structure and thermal properties
Autorzy:
Mashelmie, S.
Rabiatul Manisah, M.
Bahiyah Baba, N.
Mohd, A.
Powiązania:
https://bibliotekanauki.pl/articles/2172154.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
kenaf fibre
ABS
polymer composites
MFI
TGA
DSC
włókna kenafu
kompozyty polimerowe
wskaźnik szybkości płynięcia
analiza termograwimetryczna
skaningowa kalorymetria różnicowa
Opis:
Purpose Many manufacturers have recently become interested in using fiber-reinforced polymer composites (FRPs) in structural applications. Synthetic fibres, such as carbon and glass fibres, have been commercialised internationally for decades, but they cause environmental issues because synthetic fibres are non-biodegradable and difficult to recycle once they have served their purpose, potentially polluting the environment. Thus, natural fibre composites like kenaf is a possible replacement for synthetic fibre due to their superior physical and mechanical properties. Kenaf appears to be the best candidate for replacing synthetic fibres in order to accomplish the goal of environmental preservation while also displaying excellent properties such as equivalent specific strength, low density, and renewable resources. Design/methodology/approach The kenaf fiber was treated in KOH and added to ABS matrix to produce new composites at different loading (10, 15, 20 and 25 wt.%) by using Two Roll Mill machine. The influence of the fiber on the composites properties was evaluated. The produced material was subjected to SEM, MFI, TGA and DSC analysis. Findings The incorporation of the treated kenaf fiber has an influence on the properties of kenaf/ABS composites. The addition of 10 wt.% kenaf was found to be the best loading with MFI value, initial degradation temperature and glass transition temperature at 0.8208 g/10 min, 322.63°C and 130°C respectively. The fiber was well dispersed in the matrix and shown good adhesion to the ABS. The addition of treated fiber contribute to a reduction in the MFI, improved the thermal stability of the composites and typical effects of Tg of the composite compare to pure ABS. Research limitations/implications The results suggest the need to continue the study in order to further analyse higher kenaf loading and shed more light on the properties of the composites to improve understanding of kenaf/ABS composites. Originality/value Obtained results are a solution to alternative of synthetic fibers, which may contribute to the sustainable development of composites materials industry through the utilization of kenaf fiber with ABS matrix.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2022, 111, 2; 49--56
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Demarcation energy properties of regenerated fiber Bragg grating sensors in few-mode fibers
Autorzy:
Mohd Nazal, N. A.
Lai, M.-H.
Lim, K.-S.
Gunawardena, D. S.
Chong, W.-Y.
Yang, H.-Z.
Ahmad, H.
Powiązania:
https://bibliotekanauki.pl/articles/174756.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
regenerated fiber Bragg grating
thermal regeneration
thermal decay
few-mode fibers
Opis:
In this work, thermal regeneration of fiber Bragg gratings inscribed in single-mode fibers, two-mode step index fibers and four-mode step index fibers is performed, where the single-mode fibers are used as the reference in the analysis. Specifically, we investigate the behavior of the thermal decay, recovery and eventually the permanent erasure of the gratings in the temperature range from 25 to 1300°C. In the domain of demarcation energy, the thermal responses of the gratings can be normalized and they share similar characteristic curves despite the different temperature ramping rates used in the annealing treatment. It is found that the demarcation energy at the regeneration point and the attempt-to-escape frequency for each grating can be associated with the confinement factors of the fibers. The finding in this work has provided a new insight in the manufacture of regenerated fiber Bragg grating sensors by using few-mode fibers for multiparameter sensing in high temperature environments.
Źródło:
Optica Applicata; 2018, 48, 2; 263-271
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of fiber orientation and fiber loading on the mechanical and thermal properties of sugar palm yarn fiber reinforced unsaturated polyester resin composites
Wpływ orientacji włókien palmy cukrowej i ich zawartości na właściwości mechaniczne i termiczne kompozytów na bazie nienasyconej żywicy poliestrowej
Autorzy:
Mohd Nurazzi, N.
Khalina, A.
Chandrasekar, M.
Aisyah, H. A.
Ayu Rafiqah, S.
Ilyas, R. A.
Hanafee, Z. M.
Powiązania:
https://bibliotekanauki.pl/articles/947398.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
sugar palm fibers
unsaturated polyester resin
different fiber orientation
fiber loading
mechanical properties
thermal properties
włókno palmy cukrowej
nienasycona żywica poliestrowa
kompozyty
orientacja włókien
udział włókien
właściwości mechaniczne
właściwości termiczne
Opis:
Sugar palm [Arenga pinnata (Wurmb.) Merr] fiber reinforced unsaturated polyester resin composites with 0°, 45°, and 90° fiber different orientations were prepared and tested. The composites were characterized for tensile, flexural, impact and compression properties using ASTM D3039, ASTM D790, ASTM D250, and ASTM D3410 standards, respectively. For the thermal characterization, dynamic mechanical analysis (DMA) was conducted to characterize the on storage modulus (E’), loss modulus (E’’) and damping behavior (tan δ) of the composites. The highest mechanical performance of composites was achieved at 0° of fiber orientation composites followed by 45° and 90° fiber orientations. The fiber loading was insignificant for the 90° fiber orientation as the properties were inconsistent. The theoretical value of modulus from the tensile test was calculated using rules of mixture (ROM) and compared with the experimental values for all composites specimens. This research showed that the optimum properties occurred at 30 wt % fiber loading as reflected by the superior tensile and flexural strengths. The optimum properties of compression, impact, storage modulus and better damping properties were achieved at 40 wt % fiber loading.
Przygotowano kompozyty na bazie nienasyconej żywicy poliestrowej wzmocnionej różną ilością włókien palmy cukrowej [Arenga pinnata (Wurmb.) Merr] o rozmaite jorientacji: 0°, 45° i 90°. Z zastosowaniem norm, odpowiednio, ASTM D3039, ASTM D790, ASTM D250 i ASTM D3410 oznaczono wytrzymałość na rozciąganie i zginanie oraz odporność na uderzenie i ściskanie otrzymanych kompozytów. Właściwości termiczne scharakteryzowano metodą dynamicznej analizy mechanicznej (DMA); wyznaczono moduł zachowawczy (E’), moduł stratności (E”) i tangens kąta stratności (tan δ) kompozytów. Najlepsze właściwości mechaniczne kompozytów uzyskano w wypadku zastosowania włókien o orientacji 0° względem przyłożonej siły, a najgorsze w wypadku ułożenia włókien pod kątem 90°. W odniesieniu do kompozytów wzmocnionych włóknami o orientacji 90° udział włókien miał nieistotny wpływ na oznaczane właściwości, ponieważ wyniki były niespójne. Wartość teoretyczną modułu rozciągania wszystkich próbek kompozytów obliczono z wykorzystaniem reguły mieszania (ROM) i porównano z wartościami uzyskanymi doświadczalnie. Stwierdzono, że doskonałą wytrzymałość na rozciąganie i zginanie wykazywał kompozyt z 30 % mas. udziałem włókien, podczas gdy optymalne: wytrzymałość na ściskanie, udarność, moduł zachowawczy i właściwości tłumiące uzyskano w wypadku udziału 40 % mas. włókien.
Źródło:
Polimery; 2020, 65, 2; 115-124
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical properties of sugar palm yarn/woven glass fiber reinforced unsaturated polyester composites: effect of fiber loadings and alkaline treatment
Wpływ zawartości włókien i obróbki alkalicznej na właściwości mechaniczne kompozytów z nienasyconej żywicy poliestrowej wzmacnianych włóknem szklanym i włóknem palmy cukrowej
Autorzy:
Mohd Nurazzi, N.
Khalina, A.
Sapuan, S. M.
Ilyas, R. A.
Powiązania:
https://bibliotekanauki.pl/articles/947560.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
glass fiber
hybrid composites
mechanical properties
sugar palm fiber
yarn fiber
unsaturated polyester resin
włókno szklane
kompozyty hybrydowe
właściwości mechaniczne
włókno palmy cukrowej
włókno przędzy
nienasycona żywica poliestrowa
Opis:
In this paper, hybrid sugar palm yarn and glass fiber reinforced unsaturated polyester composites were investigated in relation to the effects of fiber loadings and alkaline treatment on the composite mechanical properties, such as tensile, flexural, impact and compression strength. The composites were fabricated at a weight ratio of matrix to reinforcement of 70 : 30 and 60 : 40, respectively, while the ratio of sugar palm yarn fiber to glass fiber was selected at 70 : 30, 60 : 40 and 50 : 50, respectively. The results revealed that the mechanical properties of the hybrid composites were increased with an increase of glass fiber loading for both 30 wt % and 40 wt % reinforcement content. The alkaline treatment of the sugar palm fibers have advantageous effect on the hybrid composite performance. The overall results indicated that the developed hybrid composites can be used as an alternative material for glass fiber reinforced polymer composites for various structural applications.
Zbadano wpływ zawartości włókien i ich obróbki alkalicznej na właściwości mechaniczne wzmacnianych włóknem szklanym kompozytów nienasyconej żywicy poliestrowej z włóknami palmy cukrowej. Oceniano wytrzymałość kompozytów na rozciąganie, zginanie, uderzenie i ściskanie. Wytworzone kompozyty zawierały 30 oraz 40% mas. włókien, przy stosunku masowym włókien palmy cukrowej do włókien szklanych 70/30, 60/40 i 50/50. Stwierdzono, że wytrzymałość mechaniczna kompozytów hybrydowych zwiększa się ze wzrostem zawartości włókna szklanego, a obróbka alkaliczna włókien palmy cukrowej wywiera korzystny wpływ na właściwości zawierających ją kompozytów hybrydowych. Uzyskane wyniki wskazują, że opracowane kompozyty hybrydowe mogą być stosowane jako materiał alternatywny dla kompozytów polimerowych wzmacnianych jedynie włóknem szklanym.
Źródło:
Polimery; 2019, 64, 10; 665-675
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 26

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies