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Wyszukujesz frazę "Suresh, P." wg kryterium: Autor


Tytuł:
The effect of thermal modulation on double diffusive convection in the presence of applied magnetic field and internal heat source
Autorzy:
Manjula, S. H.
Suresh, P.
Rao, M. G.
Powiązania:
https://bibliotekanauki.pl/articles/1839901.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
analiza nieliniowa
płyn newtonowski
konwekcja
thermal modulation
weak nonlinear analysis
internal heating
newtonian fluid
double diffusive convection
Opis:
The investigation of thermal modulation on double-diffusive stationary convection in the presence of an applied magnetic field and internal heating is carried out. A weakly nonlinear stability analysis has been performed using the finite-amplitude Ginzburg-Landau model. This finite amplitude of convection is obtained at the third order of the system. The study considers three different forms of temperature modulations. OPM-out of phase modulation, LBMO-lower boundary modulation, IPM-in phase modulation. The finite-amplitude is a function of amplitude ,Tδ frequency ω and the phase differenceθ . The effects of Tδ and ω on heat/mass transports have been analyzed and depicted graphically. The study shows that heat/mass transports can be controlled effectively by thermal modulation. Further, it is found that the internal Rayleigh number iR enhances heat transfer and reduces the mass transfer in the system.
Źródło:
International Journal of Applied Mechanics and Engineering; 2021, 26, 1; 135-155
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aeroacoustic analysis based on FW–H analogy to predict low-frequency in-plane harmonic noise of a helicopter rotor in hover
Autorzy:
Suresh, T.
Szulc, O.
Flaszynski, P.
Powiązania:
https://bibliotekanauki.pl/articles/38695686.pdf
Data publikacji:
2022
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
Lighthill’s analogy
Farassat’s formulation
blade element momentum theory
computational aeroacoustics
computational fluid dynamics
thickness noise
monopole
loading noise
dipole
Opis:
The integral formulation of the Ffowcs-Williams and Hawkings (FW–H) analogy, developed by Farassat (known as Farassat’s formulation 1A), is implemented to study the sound generation and propagation of rotating slender bodies. The general post-processing numerical code utilizes the linear acoustic theory to predict the thickness and loading noise terms for bodies in subsonic motion. The developed numerical code is validated for elementary acoustic sources (rotating monopole and dipole) against analytical solutions. The validated code is then applied for prediction of lowfrequency in-plane harmonic noise (LF-IPH) of a model helicopter rotor of Sargent and Schmitz in a low-thrust hover with full-scale tip Mach number. The required loading distribution of the rotor blade is obtained with CFD (RANS) and Blade Element Momentum Theory (BEMT) methods and also validated against literature data. The developed acoustic code, supplemented by CFD and BEMT loading analyses, allows for a detailed comparison (thickness and loading, near- and far-field, etc.) of the LFIPH noise of a helicopter rotor in both, time and frequency domains. The predicted (FW–H) acoustic signals are compared not only with the reference code solutions, but also with the experimental data. Moreover, the paper quantifies the impact of computational grid density and time-step size (used by CFD and FW–H codes) on the final solution accuracy. Additionally, a simplified analytical code is developed (based on elementary dipole solutions, compact chord assumption and BEMT method) allowing for the initial loading noise analysis with highly reduced computational resources. The acquired results are fully compatible with the classical FW–H analysis in terms of the impact of the in-plane and out-of-plane forces on the generated noise. The FW–H code predictions of the acoustic pressure and its components are in satisfactory agreement with the reference and experimental data of Sargent and Schmitz.
Źródło:
Archives of Mechanics; 2022, 74, 2-3; 201-246
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative studies on the removal of copper (II) by Ulva fasciata activated carbon and commercially activated carbon
Autorzy:
Suresh Jeyakumar, R.P.
Chandrasekaran, V.
Powiązania:
https://bibliotekanauki.pl/articles/778953.pdf
Data publikacji:
2012
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Ulva fasciata sp.
synthetic wastewater
activated carbons
adsorption
Langmuir
Opis:
In this work, the efficiency of Ulva fasciata sp. activated carbons (CCUC, SCUC and SSUC) and commercially activated carbon (CAC) were studied for the removal of Cu (II) ions from synthetic wastewater. Batch adsorption experiments were carried out as a function of pH, contact time, initial copper concentration and adsorbent dose. The percentage adsorption of copper by CCUC, SSUC, SCUC and CAC are 88.47%, 97.53%, 95.78% and 77.42% respectively. Adsorption data were fitted with the Langmuir, Freundlich and Temkin models. Two kinetic models pseudo first order and the pseudo second order were selected to interpret the adsorption data.
Źródło:
Polish Journal of Chemical Technology; 2012, 14, 4; 88-94
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of fiber length, fiber content and alkali treatment on mechanical properties of natural fiber-reinforced epoxy composites
Wpływ długości, objętości i zawartości włókien oraz ich obróbki alkalicznej na właściwości mechaniczne kompozytów epoksydowych wzmacnianych włóknami naturalnymi
Autorzy:
Bhuvaneshwaran, M.
Sampath, P. S.
Sagadevan, Suresh
Powiązania:
https://bibliotekanauki.pl/articles/946969.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
natural fibers
epoxy composites
mechanical properties
SEM
włókna naturalne
kompozyty epoksydowe
właściwości mechaniczne
Opis:
The composites of epoxy resin and Coccinia indica fibers (CIF) were obtained. The raw fibers were initially treated with 5 % NaOH. Compression molding technique was used for preparing the composites with four different fiber lengths (10, 20, 30, 40 mm) and various fiber loadings (25, 30, 35, 40 wt %). The mechanical properties of the produced composites were investigated and their structure was analyzed by using scanning electron microscope (SEM). It was found, that the composite matrix reinforced with 30 mm fiber length at 35 wt % fiber loading exhibited the best mechanical properties.
Otrzymano kompozyty epoksydowe z udziałem włókien Coccinia indica (CIF). Surowe włókna poddawano obróbce alkalicznej przy użyciu 5 % NaOH. Metodą wytłaczania sporządzono kompozyty żywicy epoksydowej zawierające 25, 30, 35 lub 40 % mas. włókien CIF o różnej długości (10, 20, 30, 40 mm). Zbadano wytrzymałość mechaniczną otrzymanych kompozytów oraz przeprowadzono obserwacje ich struktury za pomocą skaningowego mikroskopu elektronowego (SEM). Stwierdzono, że najlepsze właściwości mechaniczne wykazywały kompozyty wzmocnione 35 % mas. włókien o długości 30 mm.
Źródło:
Polimery; 2019, 64, 2; 93-99
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A communication network routing problem: Modeling and optimization using non-cooperative game theory
Autorzy:
Dubey, Sapana P.
Kedar, Ganesh D.
Ghate, Suresh H.
Powiązania:
https://bibliotekanauki.pl/articles/1838181.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
communication network
routing problem
game theory
focal points
Nash equilibrium
Pareto optimal solution
sieć komunikacyjna
teoria gier
punkt ogniskowy
równowaga Nasha
Opis:
We consider a communication network routing problem wherein a number of users need to efficiently transmit their throughput demand in the form of data packets (incurring less cost and less delay) through one or more links. Using the game theoretic perspective, we propose a dynamic model which ensures unhindered transmission of data even in the case where the capacity of the link is exceeded. The model incorporates a mechanism in which users are appropriately punished (with additional cost) when the total data to be transmitted exceeds the capacity of the link. The model has multiple Nash equilibrium points. To arrive at rational strategies, we introduce the concept of focal points and get what is termed focal Nash equilibrium (FNE) points for the model. We further introduce the concept of preferred focal Nash equilibrium (PFNE) points and find their relation with the Pareto optimal solution for the model.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2021, 31, 1; 155-164
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Finite element studies on free vibration of laminated composite cylindrical skew panels
Autorzy:
Srinivasa, C. V.
Suresh, Y. J.
Prema Kumar, W. P.
Powiązania:
https://bibliotekanauki.pl/articles/955177.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
panel cylindryczny
laminat
wolne wibracje
element skończony
częstotliwość podstawowa
cylindrical skew panel
panel angle
skew angle
antisymmetric laminates
free vibration
finite element
fundamental frequency
Opis:
This paper presents the finite element studies on free vibration of isotropic and laminated composite cylindrical skew panels. The analysis is performed using CQUAD4 and CQUAD8 elements of MSC/NASTRAN. The effects of the panel angle, skew angle, aspect ratio and length-to-thickness-ratio on fundamental frequency of isotropic cylindrical skew panels are studied. The effects of additional parameters such as the fiber orientation angle, numbers of layers and stacking sequence on the fundamental frequency of antisymmetric composite laminates are also studied. It is found that the CQUAD8 element yields better results than the CQUAD4 element in the validation and convergence studies. The CQUAD8 element is employed for the remaining part of the studies. The fundamental frequencies are found to increase with the panel angle and skew angle. When the number of layers in the laminate is large, the variation of the fundamental frequency with the number of layers is not appreciable. The boundary conditions are found to have a significant influence on the fundamental frequency.
Źródło:
International Journal of Applied Mechanics and Engineering; 2014, 19, 1; 165-180
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Manufacturing of activated carbon using disposable coconut shells
Autorzy:
Aluvihara, Suresh
Kalpage, C. S.
Bandaranayake, P. W. S. K.
Powiązania:
https://bibliotekanauki.pl/articles/1031548.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Activated carbon
Burning temperature
Coconut shells
Industrial Applications
Metallic composition
Opis:
Activated carbon is a solid carbon compound that is composed of carbon in the form of charcoal. It plays a major role in some industrial applications such as water and air purification because of the strong adsorption of its surfaces and its tendency to remove some volatile organic compounds (VOC) and most of contaminants from the water, air or some other material. Various base materials are used in the manufacturing of activated carbon, including different woods and certain synthetic materials. According to the scope of new research, it is possible to produce activated carbon economically using coconut shell waste products. In our work, the coconut shells were burnt using a muffle furnace and at a range of temperatures in 300 ºC - 390 ºC. The elemental compositions of manufactured activated carbon were analyzed using X-ray fluorescence (XRF) spectrophotometer, while the surfaces of manufactured activated carbon were microscopically analyzed using an optical microscope. Thus, the range of 330 ºC - 350 ºC was considered as the most adequate temperatures for the manufacturing process of activated carbon from these coconut shells. Beyond the non-metal carbon, 68.85% Fe and 31.15% K are generated.
Źródło:
World News of Natural Sciences; 2020, 31; 25-35
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental and finite element studies on free vibration of skew plates
Autorzy:
Srinivasa, C. V.
Suresh, Y. J.
Prema Kumar, W. P.
Powiązania:
https://bibliotekanauki.pl/articles/955136.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
laminat
analiza elementów skończonych
płyta kompozytowa
częstotliwość drgań
skew plates
antisymmetric laminates
free vibration
experimental method
finite element analysis
Opis:
The present paper deals with the experimental studies carried out on free vibration of isotropic and laminated composite skew plates. The natural frequencies were also determined using QUAD8 finite element of MSC/NASTRAN and a comparison was made between the experimental values and the finite element solution. The effects of the skew angle and aspect ratio on the natural frequencies of isotropic skew plates were studied. The effects of the skew angle, aspect ratio, fiber orientation angle and laminate sequence (keeping the number of layers constant) on the natural frequencies of antisymmetric composite laminates were also studied. The experimental values of natural frequencies are in good agreement with the FE solutions. The natural frequencies are found to increase with an increase in the skew angle. The variation of natural frequencies with the aspect ratio is small and negligible both for isotropic and laminated composite skew plates.
Źródło:
International Journal of Applied Mechanics and Engineering; 2014, 19, 2; 365-377
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-Newtonian momentum transfer past an isothermal stretching sheet with applied suction
Autorzy:
Veena, P. H.
Suresh, B.
Pravin, V. K.
Goud, A. M.
Powiązania:
https://bibliotekanauki.pl/articles/264590.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
non-Newtonian fluid
magnetic field
permeability
effect of viscoelasticity
płyn nieniutonowski
pole magnetyczne
przepuszczalność
lepkosprężystość
Opis:
The paper discusses the flow of an incompressible non-Newtonian fluid due to stretching of a plane elastic surface in a saturated porous medium in the approximation of boundary layer theory. An exact analytical solution of non-linear MHD momentum equation governing the self-similar flow is given. The skin friction co-efficient decreases with an increase in the visco-elastic parameter k1 and increase in the values of both the magnetic parameter and permeability parameter.
Źródło:
International Journal of Applied Mechanics and Engineering; 2017, 22, 3; 665-674
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Growth and Characterization of Non-Linear Optical Single Crystal: L-cysteine Hydrochloride Monohydrate
Autorzy:
Azeezaa, V.
Arul Pragasam, A.
Sunitha, T.
Koteeswari, P.
Suresh, S.
Powiązania:
https://bibliotekanauki.pl/articles/1401908.pdf
Data publikacji:
2015-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.10.Dn
78.20.Ci
67.55.Hc
Opis:
Nonlinear optical single crystals of L-cysteine hydrochloride monohydrate (LCB) were grown by slow evaporation technique. Single crystal X-ray diffraction analysis revealed the crystal system and helped to determine lattice parameter values. Powder X-ray diffraction analyses were carried out and the diffraction patterns were indexed. The optical properties of the crystals were determined using UV-visible spectroscopy. Optical constants such as refractive index, extinction coefficient and electric susceptibility were determined from UV-visible spectroscopy. The Fourier transform infrared studies confirmed the various functional groups present in the grown crystal. The mechanical behaviour of the grown crystals was studied using Vicker's microhardness tester. The thermal analysis confirmed that the crystal was stable up to 108.7°C. The dielectric constant and the dielectric loss measurements were carried out for different temperatures and frequencies. Second harmonic generation of LCB crystal was investigated by the Kurtz powder technique.
Źródło:
Acta Physica Polonica A; 2015, 128, 3; 423-430
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic mechanical analysis and thermal analysis of untreated Coccinia indica fiber composites
Dynamiczna analiza mechaniczna i analiza termiczna kompozytów z niepoddanymi obróbce włóknami Coccinia indica
Autorzy:
Balu, S.
Sampath, P. S.
Bhuvaneshwaran, M.
Chandrasekar, G.
Karthik, A.
Sagadevan, Suresh
Powiązania:
https://bibliotekanauki.pl/articles/945874.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
polymer matrix composites
Coccinia indica fiber (CIF)
compression molding
DMA
TGA
Coccinia indica fiber reinforced composites (CIFRCs)
kompozyty na osnowie polimerowej
włókno Coccinia indica (CIF)
formowanie metodą wytłaczania
kompozyty wzmocnione włóknem Coccinia indica (CIFRC)
Opis:
A natural fiber reinforced polymer matrix composites (FRCs) was prepared by the compression molding method. The natural fiber named Coccinia indica (CI) was employed to fabricate FRCs. The impact of fiber length on storage modulus, loss modulus and loss of weight in the FRCs were determined using dynamic mechanical analysis (DMA) and thermogravimetric analysis (TGA). The results revealed that a fiber length of 40 mm shows better storage modulus and nominal loss modulus owing to the higher interfacial bonding between fiber and matrix. In other investigated fiber lengths, the storage modulus is poor and loss modulus is high, which is due to inefficient stress transfer.
Metodą wytłaczania przygotowano próbki kompozytów (FRC) na osnowie polimerowej wzmocnionej włóknami naturalnymi Coccinia indica (CI). Wpływ długości zastosowanych włókien na moduł zachowawczy, moduł stratności i ubytek masy badanych FRC oceniano za pomocą dynamicznej analizy mechanicznej (DMA) i analizy termograwimetrycznej (TGA). Stwierdzono, że kompozyty z udziałem włókien o długości 40 mm wykazują korzystniejszy moduł zachowawczy i nominalny moduł stratności, dzięki lepszemu wiązaniu międzyfazowemu włókna z osnową. W wypadku kompozytów z zawartością włókien o innych długościach moduł zachowawczy jest mały, a moduł stratności duży, co wynika z nieefektywnego przenoszenia naprężeń.
Źródło:
Polimery; 2020, 65, 5; 357-362
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectral correlations and antimicrobial activities of some 1-pyrenyl chalcones
Autorzy:
Arulkumaran, R.
Vijayakumar, S.
Sundararajan, R.
Sakthinathan, S.P.
Kamalakkannan, D.
Suresh, R.
Ranganathan, K.
Rajakumar, P.R.
Powiązania:
https://bibliotekanauki.pl/articles/411776.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
substituted styryl 1-pyrenyl ketones
UV spectra
IR spectra
NMR spectra
substituent effects
antimicrobial activities
Opis:
A series of 1-pyrenyl chalcones have been synthesized by Crossed-Aldol condensation of 1-acetylpyrene and substituted benzaldehydes. The purities of these chalcones have been checked by their physical constants, UV, IR, NMR and MASS spectral data. The spectral data of these chalcones have been correlated with Hammett sigma constants, F and R parameters using single and multi-linear regression analysis. From the results of statistical analysis, the effect of substituents on the spectral group frequencies have been discussed. The anti-microbial activities of these chalcones have been evaluated using Bauer-Kirby method.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 5; 21-38
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Infrared and 13C NMR Spectral Correlation Analysis of Some Substituted Oxazepin Based Ketone and Thione Derivatives with Hammett Constant
Autorzy:
Sathiyamoorthi, K.
Kamalakkannan, D.
Suresh, R.
Sakthinathan, S. P.
Arulkumaran, R.
Sundararajan, R.
Thirunarayanan, G.
Powiązania:
https://bibliotekanauki.pl/articles/1193044.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Oxazepins
IR
13C NMR
Hammett constant
F and R parameter
Single and multi-regression analysis
Opis:
Single and multi-regression analysis was applied for the corrosion study of transmission of substituent effects on IR carbonyl stretching frequencies and 13C chemical shifts of some substituted oxazepin compounds. The substituent effects were estimated on the basis of results of the statistical analysis. The differences among the obtained regression coefficients were discussed in terms of the relative importance of the field, inductive and resonance effects of substituent.
Źródło:
World Scientific News; 2016, 58; 48-64
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of fiber reinforcement towards the physical characteristics of low density polyethylene laminated composites
Wpływ rodzaju włókien na właściwości fizyczne laminatowych kompozytów polietylenu małej gęstości
Autorzy:
Ravichandran, S.
Raj, A. Daniel
Visvanath, P. Balaji
Mohammad, Faruq
Al-Lohedan, Hamad A.
Sagadevan, Suresh
Powiązania:
https://bibliotekanauki.pl/articles/947156.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
low density polyethylene composites
mechanical properties
thermal studies
water absorption study
epoxy resin
Kevlar fiber
glass fiber
carbon fiber
kompozyty polietylenu małej gęstości
właściwości mechaniczne
badania termiczne
badania absorpcji wody
żywica epoksydowa
włókno Kevlar
włókno szklane
włókno węglowe
Opis:
In recent years, the increased interest in the design and fabrication of lightweight polymer composites with various combinations and stoichiometry is due to their enhancement of electrical, mechanical, thermal, and biological properties compared to the properties of conventional materials. With that view, the present study deals with the effects of low density polyethylene composites (LDPE) reinforced with epoxy resin, glass fiber, carbon fiber, and Kevlar towards the mechanical, thermal, and water absorption properties. The mechanical studies showed that the LDPE composite reinforced carbon fiber has the best tensile properties compared to other composites and this can be mostly due to the proper bonding and associated interaction between the polymeric matrix and the bidirectional layer of the fibers. Also, the carbon fiber reinforced composite has superior properties of impart energy compared to the other composites and the non-reinforced ones and this is attributed to the crystalline nature of carbon fiber. Further studies of the thermal properties indicated that the retention of thermal stability for all the fiber-reinforced polymer composites, while the water absorption revealed a considerable increase in the weight of Kevlar fiber-reinforced composite. From the overall analysis, the enhanced properties of LDPE matrix reinforced fibers are linked to the morphological changes that occurred and are directly affected by the nature of the fiber.
Zwiększone w ostatnich latach zainteresowanie projektowaniem i wytwarzaniem lekkich kompozytów polimerowych wynika z ich lepszych właściwości elektrycznych, mechanicznych, termicznych i biologicznych w porównaniu z cechami materiałów konwencjonalnych. Zbadano wpływ rodzaju wzmocnienia (włókno szklane, włókno węglowe i włókno Kevlar) na właściwości mechaniczne, termiczne i absorpcję wody laminatowych kompozytów polietylenu małej gęstości (LDPE) z żywicą epoksydową. Stwierdzono, że kompozyt LDPE z włóknem węglowym, w porównaniu z innymi kompozytami, wykazuje najlepszą wytrzymałość na rozciąganie, co może wynikać głównie z interakcji polimerowej osnowy z dwukierunkową warstwą włókien. Ponadto kompozyt ten ma większą zdolność przenoszenia energii niż pozostałe badane kompozyty, co można przypisać krystalicznej budowie włókna węglowego. Badania właściwości termicznych wykazały stabilność termiczną wszystkich kompozytów polimerowych wzmocnionych włóknami oraz znaczną absorpcję wody kompozytu wzmocnionego włóknem Kevlar.
Źródło:
Polimery; 2020, 65, 6; 449-457
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectral correlation analysis of Hammett substituent constants and biological activities of some (E)-1-(4-phenoxyphenyl)-3-phenylprop-2-en-1-ones
Autorzy:
Kalyanasundaram, N.
Sakthinathan, S. P.
Suresh, R.
Kamalakkannan, D.
Joseph, S. J.
Vanangamudi, G.
Thirunarayanan, G.
Powiązania:
https://bibliotekanauki.pl/articles/412539.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
substituted styryl 4-phenoxyphenylketones
UV-spectra
IR spectra
NMR spectra
Hammett constants
substituent effects
regression analysis and antimicrobial activities
Opis:
A series of aryl chalcones have been synthesized from 4-phenoxyacetophonone with various substituted benzaldehydes. The purity of all chalcones has been checked using their physical constants and spectral data. These spectral data have been correlated with Hammett substituent constants and F and R parameters using single and multi-linear regression analysis. From the results of statistical analysis, the effect of substituents on the above spectral data has been studied. The single parameter correlation with few Hammett constants and F and R parameters gave satisfactory correlation coefficients whereas all multiple correlations gave satisfactory correlation coefficients with Resonance, Field and Swain-Lupton’s parameters. The antimicrobial activities of all chalcones have been studied using Bauer-Kirby method.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 9; 23-47
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł

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