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Tytuł:
AC Conductivity of Cobalt Phthalocyanine
Autorzy:
Abdel-Malik, T. G.
Kassem, M. E.
Aly, N. S.
Khalil, S. M.
Powiązania:
https://bibliotekanauki.pl/articles/1920784.pdf
Data publikacji:
1992-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.40.+i
Opis:
The dielectric properties of cobalt phthalocyanine are investigated in the frequency range 50-5×10$\text{}^{5}$ Hz and within the temperature range 293-363 K. The frequency dependence of the AC impedance could be expressed by the complex plane of the complex impedance. Analysis of the AC conductivity reveals semiconducting features based predominantly on the hopping mechanism. The relaxation time, derived from the experimental results, shows a thermally activated process.
Źródło:
Acta Physica Polonica A; 1992, 81, 6; 675-680
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of hydrogel- and xerogel-based sorbent from Empty Fruit Bunch (EFB)
Autorzy:
Alias, A.B.
Qarizada, D.
Malik, N.S.A.
Noraini, N.M.R.
Rashid, Z.A.
Powiązania:
https://bibliotekanauki.pl/articles/24200604.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
biomass
hydrogel
empty fruit bunch
xerogel
sorbent
biomasa
hydrożel
pusta kiść owoców
kserożel
Opis:
Purpose: This paper focuses on the synthesis and comparison of hydrogel- and xerogel-based sorbents from EFB. Design/methodology/approach: Hydrogels were synthesised by polymerisation of EFB biochar with acrylamide (AAm) as a monomer, N, N'-Methylenebisacrylamide (MBA) as cross-linker and ammonium persulfate (APS) as initiator, as well as by internal gelation method of sodium alginate, empty fruit bunch (EFB), calcium carbonate (CaCO3), and glucono delta-lactone (GDL). From the alginate hydrogels obtained, xerogels were synthesised via the oven-drying method. Then, EFB-based hydrogel and xerogel sorbents were analysed and compared based on characterisation analysis by using scanning electron microscopy (SEM), Brunauer− Emmett−Teller (BET), Fourier-Transform Infrared Spectroscopy (FTIR), and thermogravimetric analysis (TGA). Findings: The xerogel-based EFB is a better adsorbent than the hydrogel-based EFB because it has a larger pore volume (0.001449 cm3/g), larger pore size (63.7987 nm), higher moisture content (7.97%), lower ash content (12.55%), and is more thermally stable. Research limitations/implications: The research is to compare two new adsorbents, namely Hydrogel and Xerogel, from EFB in terms of their characteristics. Practical implications: Both adsorbents show a highly toxic material uptake, especially EFB xerogel. This adsorbent is comparable with the other commercialised adsorbent. Thus, this product can be a highly potential adsorbent for gas and wastewater adsorption. Originality/value: The authenticity results of this article were found to be 15% similar. The novelty of this paper is to compare the two adsorbents, namely hydrogel and xerogel, that originated from EFB.
Źródło:
Archives of Materials Science and Engineering; 2022, 118, 2; 49--60
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Validated Reverse Phase HPLC Technique for the Determination of TATB Assay
Autorzy:
Bhattacharyya, S. C.
Patil, R. S.
Santosh, M. S. S. N. M.
Bhattacharya, B.
Malik, R. K.
Mehra, A.
Powiązania:
https://bibliotekanauki.pl/articles/951496.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
TATB
HPLC
HPTLC
explosive
LOQ
LOD
Opis:
The main hurdle for the estimation of the purity of 1,3,5-triamino-2,4,6-trinitrobenzene (TATB) is its insolubility in most of the known organic solvents. In the conventional method, TATB is digested with steam in a modified Kjeldahl digester and the ammonia evolved is estimated quantitatively. To do away with this cumbersome method, a simple, rapid HPLC technique using a reverse phase C-18 column has been established for quantitative determination of the purity of TATB. A sharp and symmetrical peak with a retention time of 2.92 min at 355 nm is obtained for pure TATB when the flow rate is 2.0 mL/min. The linearity of the detector response has been studied with sample concentrations ranging from 10 to 50 mg/L. The method addresses two important issues of sample preparation and the precision of measurement. Unlike the previously reported HPLC techniques which mainly aimed at the detection of TATB, the present work is a validated account of a quantitative estimation of purity. Regular production batch samples have been assayed by this method and the results are compared with those obtained from the conventional analysis. The HPLC method is convenient and reliable for quality control of the product at the plant level.
Źródło:
Central European Journal of Energetic Materials; 2016, 13, 3; 641-657
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metal-metal Cast Composites
Autorzy:
Braszczyńska-Malik, K. N.
Przełożyńska, E.
Powiązania:
https://bibliotekanauki.pl/articles/382051.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
composite
AZ91
magnesium alloys
Ti6Al4V particles
microstructure
kompozyt
stop magnezu
cząstki Ti6Al4V
mikrostruktura
Opis:
Microstructure of experimental AZ91 magnesium matrix composite with Ti6Al4V particles is presented. Composite were fabricated by casting method. The obtained experimental composite exhibited uniform distribution of Ti6Al4V particles within the matrix alloy. Neither clusters of particles nor any new phases creating during component reactions are observed.
Źródło:
Archives of Foundry Engineering; 2014, 14, 3 spec.; 110-113
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure of Mg–Al–RE-type Experimental Magnesium Alloy Gravity Cast into Sand Mould
Autorzy:
Braszczyńska-Malik, K. N.
Przełożyńska, E.
Powiązania:
https://bibliotekanauki.pl/articles/379591.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
magnesium alloy
aluminium
rare earth elements (REE)
as-cast conditions
microstructure
stop magnezu
pierwiastki ziem rzadkich
odlew
mikrostruktura
Opis:
Magnesium alloy with 5 wt% Al, 0.35 wt% Mn and 5 wt% rare earth elements (RE) was prepared and gravity cast into a sand mould. Microstructure investigations were conducted. Analyses of the Mg-Al-RE alloy microstructure were carried out by light microscopy, scanning electron microscopy and the XRD technique. In the as-cast condition, the alloy was composed of α-Mg, Al11RE3 and Al10RE2Mn7 intermetallic phases. Additionally, due to non-equilibrium solidification conditions, an Al2RE intermetallic phase was revealed.
Źródło:
Archives of Foundry Engineering; 2016, 16, 2; 115-118
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Partially Melted Zone in Mg-Al Type Alloy After Gas-tungsten Arc Welding
Autorzy:
Braszczyńska-Malik, K. N.
Przełożyńska, E.
Mróz, M.
Powiązania:
https://bibliotekanauki.pl/articles/381760.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Mg-Al-Zn alloy
gas tungsten arc welding
partially melted zone
stop Mg-Al-Zn
spawanie łukowe
strefa przetopienia
Opis:
The gas-tungsten arc (GTA) welding behaviors of the commercial AZ91 magnesium alloy were examined in terms of microstructure characteristics. This study focused on the effects of the GTAW process parameters (like welding current, welding speed and method of additional cooling of the welded samples) on the size of the fusion zone (FZ) and partially melted zone (PMZ). The PMZ morphology of the eutectic regions changed from less to more divorced in the direction from the FZ to the base metal. The largest PMZ was obtained at a low welding speed (3.33 mm/s) and without additional water cooling of the samples.
Źródło:
Archives of Foundry Engineering; 2013, 13, 2 spec.; 18-21
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some Mechanical Properties of Experimental Mg-Al-RE-Mn Magnesium Alloys
Autorzy:
Braszczyńska-Malik, K.N.
Powiązania:
https://bibliotekanauki.pl/articles/379996.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
magnesium alloy
aluminum
rare earth elements (REE)
mechanical properties
stop magnezu
aluminium
pierwiastki ziem rzadkich
właściwości mechaniczne
Opis:
The results of some mechanical properties of four Mg-5Al-xRE-0.4Mn (x=1–5) alloys are presented. The microstructure of experimental alloys consisted of an σ-Mg phase and an α+γ semi-divorced eutectic, Al11 RE3 phase and an Al10 RE2 Mn7 intermetallic compound. For gravity casting in metal mould alloys, Brinell hardness, impact strength, tensile and compression properties at ambient temperature were determined. The performed mechanical tests allowed the author to determine the proportional influence of the mass fraction of rare earth elements in the alloys on their tensile strength, yield strength, compression strength and Brinell hardness. The impact strength of the alloys slightly decreases with a rise in the rare earth elements mass fraction.
Źródło:
Archives of Foundry Engineering; 2014, 14, 1; 13-16
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Potential of endochitinase gene to control Fusarium wilt and early blight disease in transgenic potato lines
Autorzy:
Fatima, Neelam
Tabassum, B.
Yousaf, I.
Malik, M.
Khan, A.
Sajid, I.A.
Tariq, M.
Toufiq, N.
Riaz, S.
Nasir, I.A.
Powiązania:
https://bibliotekanauki.pl/articles/2084713.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
early blight disease
Fusarium
potato
Trichoderma
Opis:
Potato (Solanum tuberosum L.), an important food crop in the world, is susceptible to many fungal pathogens including Alternaria solani and Fusarium oxysporum causing Fusarium wilt and early blight diseases. Mycoparasitic fungi like Trichoderma encode chitinases, cell wall degrading enzymes, with high antifungal activity against a wide range of phytopathogenic fungi. In this study, a binary vector harboring endochitinase gene of ~1,000 bp was constructed and used to transform potato nodes through Agrobacterium-mediated transformation. Out of several primary transformants, two transgenic potato lines were verified for transgene insertion and integration by Southern blot. In a pot experiment for Fusarium resistance, the transgenic potato lines didn’t show any symptoms of disease, instead they remained healthy post infection. The transgenic potato lines exhibited 1.5 fold higher mRNA expression of endochitinase at 7 days as compared to 0 day post fungus inoculation. It was evident that the mRNA expression decreased over days of inoculation but was still higher than at 0 day and remained stable upto 30 days post inoculation. Similarly, for A. solani infection assay, the mRNA expression of the endochitinase gene was 3 fold higher 7 days post inoculation compared to expression at 0 day. Although the expression decreased by1.2 fold during subsequent days post infection, it remained stable for 30 days, suggesting that protection in transgenic potato plants against fungal pathogens was achieved through an increase in endochitinase transcript.
Źródło:
Journal of Plant Protection Research; 2019, 59, 3; 376-382
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reverse phase high performance liquid chromatographic method development based on ultravioletvisible detector for the analysis of 1-hydroxypyrene (PAH biomarker) in human urine
Autorzy:
Kamal, Atif
Gulfraz, Mohammad
Anwar, Mohammad A.
Malik, Riffat N.
Powiązania:
https://bibliotekanauki.pl/articles/2177414.pdf
Data publikacji:
2015-04-07
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
1-OHP
1-hydroxypyrene
high pressure liquid chromatography
Pakistan
biomarkers of exposure
PAHs
Opis:
Objectives 1-hydroxypyrene is an important biomarker of exposure to polycyclic aromatic hydrocarbons (PAHs), which appears in the urine of exposed human subjects. In developing countries, where advanced instruments are not available, the importance of this biomarker demands convenient and sensitive methods for determination purposes. This study aimed at developing a methodology to quantify 1-hydroxypyrene (a biomarker of PAHs exposure) based on the UV-visible detector in the reverse phase high pressure liquid chromatography (HPLC). Material and Methods A 20 μl injection of sample was used for manual injection into the HPLC Shimadzu, equipped with the SPD-20 A UV-visible detector, the LC-20AT pump and the DGU-20A5 degasser. The C-18 column was used for the purpose of the analysis. Results The method showed a good linearity (the range: R² = 0.979–0.989), and high detectability up to the nmol level. The average retention was 6.37, with the accuracy of 2%, and the percentage of recovery remained 108%. The overall performance of this method was comparable (in terms of detection sensitivity) and relatively better than previously reported studies using the HPLC system equipped with the UV-detector. Conclusions This method is suitable and reliable for the detection/quantification of the 1-OHP in human urine samples, using the UV-detector, however, it is less sensitive as compared to the results of a florescence detector.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2015, 28, 2; 399-403
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aluminosilcate glass cenospheres as a component of cast magnesium matrix composites
Autorzy:
Kamieniak, J.
Żydek, A.
Braszczyńska-Malik, K. N.
Powiązania:
https://bibliotekanauki.pl/articles/382002.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
AZ91 magnesium alloy
aluminosilicate cenospheres
metal matrix composite
stop magnezu AZ91
mikrosfera glinokrzemianowa
kompozyt metalowy
Opis:
The main characteristic of aluminosilicate glass cenospheres and their possible use as a component of magnesium matrix composites were presented. The results revealed that particular parts of cenospheres differ insignificantly from each other and it depends on which power plant cenospheres come from. The characteristic of cenospheres concerned their structure and phase composition and dimensions such as: wall thickness and size of pores occurring in walls, depending on cenospheres origin. Thickness of cenospheres walls and pore size were measured by using ImageJ computer software. The structure of aluminosilicate glass cenospheres and their phase composition have been investigated by scanning electron microscopy and X-ray diffraction (XRD). The possibility of cenospheres utilization in the fabrication of magnesium matrix composites was presented on the example of AZ91 magnesium alloy composite with fly ash cenospheres. Composite was fabricated by pressure infiltration method.
Źródło:
Archives of Foundry Engineering; 2011, 11, 2 spec.; 109-112
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of process temperature on AZ91 matrix microstructure of composites with aluminosilicate glass cenospheres
Autorzy:
Kamieniak, J.
Żydek, A.
Braszczyńska-Malik, K. N.
Powiązania:
https://bibliotekanauki.pl/articles/380096.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
AZ91 magnesium alloy
metal matrix composite
glass cenosphere
stop magnezu AZ91
kompozyt metalowy
cenosfera
Opis:
AZ91 magnesium alloy matrix composites with aluminosilicate glass cenospheres were fabricated successfully by the pressure infiltration method. Different parameters of the fabrication process, such as temperature of the mould and temperature of cenospheres were used. Influence of the temperature variation of particular parameters on the microstructure has been investigated. The microstructure of AZ91 magnesium alloy and fabricated composites have been investigated by light microscopy (LM) and scanning electron microscopy (SEM). The results revealed that AZ91 magnesium alloy consists of α-Mg matrix and eutectic α-Mg17Al12 and a small amount of discontinuous precipitates of γ phase. The microstructure of matrix AZ91 in fabricated composites is characterized also by the presence of α-Mg matrix and eutectic α-Mg17Al12. However, in the composite fabricated by using the mould heated to 500 °C more discontinuous precipitates of γ phase were observed.
Źródło:
Archives of Foundry Engineering; 2011, 11, 3 spec.; 107-110
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Applications of Simulation Technology - Pitfalls and Challenges
Autorzy:
Malik, A.
Zafar, N.
Powiązania:
https://bibliotekanauki.pl/articles/116011.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Marine Simulator
Simulation Technology
Simulator Based Training (SBT)
Maritime Education and Training (MET)
simulator
Simulator Instructor
Simulator Training
Simulator Experience
Opis:
Simulator based training has its own unique features and problems associated with it. There is a need to discuss these issues in order to understand the real meaning of simulator based training and to handle it effectively. Like other fields of training, use of simulation in the maritime industry is owing to the multiple factors covering technological, financial and training needs of the time. When properly used, supported by well trained and experienced instructors, simulator training, through its risk free environment, can contribute to a reduction in accidents and improve capability and efficiency, by providing trainees with the necessary experience and self confidence to carry out their roles, functions and tasks.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2015, 9, 3; 391-396
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of culture vessels on micro-morphological features of in vitro Dendrobium Sabin Blue orchid
Autorzy:
Malik, A.N.A.
Uddain, J.
Chin, C.K.
Chew, B.L.
Antony, J.J.J.
Parab, A.R.
Subramaniam, S.
Powiązania:
https://bibliotekanauki.pl/articles/2096256.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
alternative culture vessel
orchid
in vitro culture
protocorm-like bodies (PLBs)
Opis:
Different designs of the plant tissue culture vessel, such as size, material, and shape, may alter its microenvironment atmosphere. The present study was conducted on protocorm-like bodies (PLBs) of Dendrobium Sabin Blue orchid to determine the development of PLBs on plastic and glass culture vessels of different sizes. PLBs were cultured in half-strength Murashige and Skoog (MS) medium with the same initial weight of 0.5 g in 10 replicates. The growth index of the PLBs was calculated after 11 weeks to study their growth in every vessel; additionally, biochemical analysis was performed to determine carbohydrate content, proline concentration, and photosynthesis pigments in the PLBs. Scanning electron microscopy (SEM) was performed to study stomata development on PLBs in each vessel, and histological analyses were conducted to study the cell structure. Overall, the PLBs cultured in a large 470 ml plastic vessel showed successful growth with a high growth index, high carbohydrate content, low-stress condition, and high chlorophyll content. SEM confirmed that the presence of trichome and rhizoid in PLBs cultured in the 470 ml plastic vessel. Histological analysis showed the formation of the shoot on the PLBs and the presence of starch granules. Thus, the use of plastic as a culture vessel provides a good impact for culturing PLBs and has low cost.
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2022, 103, 1; 41-52
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructural analysis of AM50/Mg2Si cast magnesium composites
Autorzy:
Malik, M. A.
Majchrzak, K.
Braszczyńska-Malik, K. N.
Powiązania:
https://bibliotekanauki.pl/articles/380454.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stop magnezu AM50
Mg2Si
krzemek magnezu
kompozyt metalowy
AM50 magnesium alloy
magnesium silicide
metal matrix composites
Opis:
AM50/Mg2Si composites containing 5.7 wt. % and 9.9 wt. %. of Mg2Si reinforcing phase were prepared successfully by casting method. The microstructure of the cast AM50/Mg2Si magnesium matrix composites was investigated by light microscopy and X-ray diffractometry (XRD). The microstructure of these composites was characterized by the presence of \alfa-phase (a solid solution of aluminium in magnesium), Mg17Al12 (\gamma-phase), Al8Mn5 and Mg2Si. It was demonstrated that the Mg2Si phase was formed mainly as primary dendrites and eutectic.
Źródło:
Archives of Foundry Engineering; 2012, 12, 4; 109-112
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructural characterization of cast magnesium matrix composites by Raman microscopy
Autorzy:
Malik, M. A.
Braszczyńska-Malik, K. N.
Majchrzak, K.
Powiązania:
https://bibliotekanauki.pl/articles/380033.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
magnesium matrix composites
SiC
Mg2Si
Raman spectroscopy
kompozyt magnezowy
spektroskopia Ramana
Opis:
Cast magnesium matrix composites reinforced with silicon carbide particles were investigated by using Raman microscopy. 3C, 4H and 6H polytypes of SiC particles were identified in the investigated composites. Additionally, Mg2Si compound was detected by Raman microscopy in the composites microstructure.
Źródło:
Archives of Foundry Engineering; 2013, 13, 1; 95-98
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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