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Wyszukujesz frazę "Ranjan, K." wg kryterium: Autor

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    Wyświetlanie 1-9 z 9
    Tytuł:
    Improving crashworthiness by damping vibrations in cfrp composite structures using carbon nanotubes springs
    Autorzy:
    Ranjan, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/950116.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    carbon nanotube springs
    CFRP
    piezoelectric substance
    impact
    crashworthiness
    Opis:
    Carbon nanotubes have tensile strength approximately 30 times higher than the conventional steel. Moreover theoretically these CNT moulded into springs can store potentially 1000 times more energy than steel. Carbon nanotubes have excellent damping characteristics, which is possibly due to interfacial friction between the carbon nanotubes and the polymer resins and also because of large surface area over given specific mass. There applications are still far from reality. But here in this paper I will try to bring the CNT springs to a new application to improve the crashworthiness of a car may it be a formula one or a supercar whose chassis is moulded out of Carbon Fiber Reinforced Plastic (CFRP). These springs combined with piezoelectric substance can give tremendous improvement in driver’s safety during collisions. Here I have tried to combine the mechanical strength of Carbon nanotube with best suitable piezoelectric material to derive a new property which will transform impact energy into electrical energy and hence utilize it for driver’s protection. In the paper I have studied various piezoelectric materials, their bonding and behaviour with carbon atoms. I have tried to generate a possible stable structure theoretically which can withstand high impact as well as generate enough potential energy for driver to be safe during the impact.
    Źródło:
    Journal of KONES; 2013, 20, 2; 343-348
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ethics of Knowledge Sharing: A Perspective of Social Ontology
    Autorzy:
    Panda, Ranjan K.
    Powiązania:
    https://bibliotekanauki.pl/articles/781412.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    Ethics
    knowledge sharing
    knowledge production
    intentionality
    normativity
    collective intentionality
    cultural background
    Obligatory action
    care and commitment
    institutional facts
    moral responsibility
    social ontology
    Opis:
    In the contemporary socio-economical scenario, knowledge sharing has become a crucial topic for discussion. As the economy of the societies becoming knowledge centric, knowledge production and dissemination by the educational and other social institutions must play an important role. In this paper, we discuss the notion of knowledge sharing as normative action involving two modes of function: voluntary and obligatory. Knowledge sharing as voluntary action presupposes personal ontology of knowledge. The knower as owner of knowledge has the right to disseminate knowledge. The reason of this dissemination could be sometimes to fulfill certain psychological desire or material needs, rather than purely value centric. Such a mode of sharing could be the reason for the degeneration of knowledge. It is because voluntary dissemination of knowledge does not go beyond the whims and fancies of the knower. On the other hand, knowledge sharing as an obligatory action emphasizes care and commitment. These normative elements could not only transform the attitude of the knower, but also help him to transcend the mere economic and psychological reasons of knowledge sharing. This transcendental logic of sharing would show how knowledge obtains its social ontology.
    Źródło:
    Ethics in Progress; 2012, 3, 1; 53-70
    2084-9257
    Pojawia się w:
    Ethics in Progress
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies on Viscoelastic, Thermal and Morphological Properties of Vinyl Ester - Mixed Diluents System
    Autorzy:
    Ranjan, J. K.
    Raghu Raja Pandiyan, K.
    Goswami, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/354420.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    vinyl ester resin
    dynamic mechanical analysis
    TGA
    DSC
    morphology
    Opis:
    Vinyl ester resin networks formed by using mixture of diluents were prepared. Methyl methacrylate (MMA) diluent was mixed in various proportions with vinyl ester resin which was already premixed with styrene diluent (45 wt. %). Weight ratios e.g. 80:20, 70:30 and 60:40 of VE resin: MMA diluents were studied. Viscoelastic properties of the cross-linked resin were studied by dynamic mechanical analyzer in terms of storage modulus and tanδ. Thermal analysis was performed using non-isothermal mode of Differential scanning calorimetry. The samples with mixed diluents, showed higher modulus, and glass transition temperature in comparison to that of the pure vinyl ester-styrene resin cross-linked in presence of styrene only. The difference in thermal stability between vinyl ester-styrene and vinyl ester-MMA-styrene was checked. Vinyl Ester – 20 wt. % MMA-Styrene samples have the best thermal property among all other prepared samples. Multiphase morphology was formed for the thermoset crosslinked with mixed diluents in contrast to that formed with single diluent. With increase in MMA content in the resin dispersed domain size increased.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 3; 1845-1850
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kernel function based regression approaches for estimating the oxygen transfer performance of plunging hollow jet aerator
    Autorzy:
    Kumar, M.
    Tiwari, N. K.
    Ranjan, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/368684.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    volumetric oxygen transfer coefficient
    multiple nonlinear regression
    Gaussian process regression
    support vector regression
    współczynnik wnikania tlenu
    regresja nieliniowa
    proces gaussowski
    regresja wektora wsparcia
    Opis:
    Purpose: To evaluate the capability of various kernels employed with support vector regression (SVR) and Gaussian process regression (GPR) techniques in estimating the volumetric oxygen transfer coefficient of plunging hollow jets. Design/methodology/approach: In this study, a data set of 81 observations is acquired from laboratory experiments of hollow jets plunging on the surface of water in the tank. The jet variables: jet velocity, jet thickness, jet length, and water depth are varied accordingly and the values of volumetric oxygen transfer coefficient is computed. An empirical relationship expressing the oxygenation performance of plunging hollow jet aerator in terms of jet variables is formulated using multiple nonlinear regression. The performance of this nonlinear relationship is compared with various kernel function based SVR and GPR models. Models developed with the training data set (51 observations) are checked on testing data set (24 observations) for performance comparison. Sensitivity analysis is carried out to examine the influence of jet variables in effecting the oxygen transfer capabilities of plunging hollow jet aerator. Findings: The overall comparison of kernels yielded good estimation performance of Radial Basis Function kernel (RBF) and Pearson VII Function kernel (PUK) using the SVR technique which is followed by nonlinear regression, and other kernel function based regression models. Research limitations/implications: The results of the study pertaining to the performance of kernels are based on the current experimental conditions and the estimation potential of the regression models may fluctuate beyond the selection of current data range due to datadependant learning of the soft computing models. Practical implications: Volumetric oxygen transfer coefficient of plunging hollow jets can be predicted precisely using SVR model by employing RBF as kernel function as compared to empirical correlation and other kernel function based regression models. Originality/value: The comparative analysis of kernel functions is conducted in this study. In previous studies, the predictive modelling approaches are implemented in simulating the aeration properties of cylindrical solid jets only, while this paper simulates the volumetric oxygen transfer coefficient of diverging hollow jets with the jet variables by utilizing polynomial, normalized polynomial, PUK, and RBF kernels in SVR and GPR.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2019, 95, 2; 74-84
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of heat transfer on thermal stresses in an annular hyperbolic fin: an approximate analytical solution
    Autorzy:
    Mallick, A.
    Ranjan, R.
    Sarkar, P. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/279437.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    thermal stresses
    Adomian decomposition method (ADM)
    variable thermal conductivity
    Opis:
    An approximate analytical solution is presented for thermal stresses in an annular convectiveconductive fin of a hyperbolic profile with temperature dependent thermal conductivity. The classical thermo-elasticity theory coupled with the ADM based polynomial form of temperature field is employed for an approximate analytical solution of thermal stresses. The influence of thermal parameters, i.e. variable thermal conductivity, the thermo-geometric parameter and the non-dimensional coefficient of thermal expansion on temperature and sttress fields are investigated. The results for the stress field obtained from the ADM based solution are compared with those available in literature and found to be in close agreement.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2016, 54, 2; 437-448
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tuning of suitable solar spectrum onto photocatalytic materials of the matched band gap using optical engineering
    Autorzy:
    Ranjan, R
    Ghosh, A
    Nirala, A K
    Yadav, H L
    Powiązania:
    https://bibliotekanauki.pl/articles/174130.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    photocatalytic materials
    holographic concentrator
    diffraction efficiency
    solar spectrum
    Opis:
    In this report, we have carried out work on the concept of optical engineering for tuning solar spectrum onto photocatalytic materials of the matched band gap using a holographic concentrator. Processing parameters of holographic concentrators have been designed suitably to have a control over the desired wavelength range for photocatalytic materials of the matched band gap.
    Źródło:
    Optica Applicata; 2015, 45, 2; 237-247
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spatio-temporal variation of rainfall over Bihar State, India
    Przestrzenna i czasowa zmienność opadów w stanie Bihar w Indiach
    Autorzy:
    Warwade, P.
    Tiwari, S.
    Ranjan, S.
    Chandniha, S. K.
    Adamowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/293215.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    climate change
    hydrology
    rainfall
    spatio-temporal variation
    hydrologia
    opady
    zmiana klimatu
    zmienność w czasie i przestrzeni
    Opis:
    This study detected, for the first time, the long term annual and seasonal rainfall trends over Bihar state, India, between 1901 and 2002. The shift change point was identified with the cumulative deviation test (cumulative sum – CUSUM), and linear regression. After the shift change point was detected, the time series was subdivided into two groups: before and after the change point. Arc-Map 10.3 was used to evaluate the spatial distribution of the trends. It was found that annual and monsoon rainfall trends decreased significantly; no significant trends were observed in pre-monsoon, monsoon, post-monsoon and winter rainfall. The average decline in rainfall rate was –2.17 mm·year–1 and –2.13 mm·year–1 for the annual and monsoon periods. The probable change point was 1956. The number of negative extreme events were higher in the later period (1957–2002) than the earlier period (1901–1956).
    W badaniach prezentowanych w niniejszej pracy wykryto po raz pierwszy długookresowe trendy rocznych i sezonowych wartości opadów w indyjskim stanie Bihar w latach 1901–2002. Stosując kumulatywny test odchyleń (CUSUM – ang. cumulative deviation test) i regresję liniową zidentyfikowano punkt zwrotny. Następnie serie czasowe zostały podzielone na dwie grupy: przed i po punkcie zwrotnym. Do oceny przestrzennego rozkładu trendów zastosowano program Arc-Map 10.3. Stwierdzono, że trendy rocznych i monsunowych opadów znacząco malały. Nie zaobserwowano istotnych trendów w odniesieniu do opadów przed monsunem, po monsunie i w okresie zimowym. Średnie zmniejszenie ilości opadów wynosiło 2,17 mm·rok–1 i 2,13 mm ·rok–1 odpowiednio dla opadów rocznych i monsunowych. Prawdopodobnym punktem zwrotnym był rok 1956. Liczba skrajnych negatywnych zjawisk była większa w okresie 1957–2002 niż w okresie 1901–1956.
    Źródło:
    Journal of Water and Land Development; 2018, 36; 183-197
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of arsenic exposure in oral/oropharyngeal carcinoma in West Bengal
    Autorzy:
    Pal, Pritha
    Raychowdhury, Ranjan
    Dolai, Tuphan K.
    Roy, Sanchita
    Dastidar, Rinini
    Halder, Ajanta
    Powiązania:
    https://bibliotekanauki.pl/articles/2161855.pdf
    Data publikacji:
    2017-03-30
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    Apoptosis
    risk factor
    micronuclei
    oral cancer
    arsenic toxicity
    West Bengal
    Opis:
    Objectives To study any possible correlation between arsenic toxicity and the development of oral carcinoma in West Bengal population. Material and Methods Ethical clearance for this study was obtained from the Vivekananda Institute of Medical Sciences. Out of 30 785 patients attending our hospital from November 2012 to July 2015, 107 cases and 50 control individuals were selected. The hair and buccal smear samples were obtained upon their consent for the purpose of the analysis of arsenic count and cytogenetic damage, respectively. Results Ninety-six percent of cases came from the highly arsenic affected districts and 81.3% showed their arsenic count above the safe limit (0.8 μg/g) whereas 96% of the controls’ arsenic count was within the safe limit. The study showed a significant difference of the micronuclei and apoptosis frequency between the cases and controls. Conclusions The difference of micronuclei and apoptosis frequency between cases and controls was significant. The maximum number of cases came from highly arsenic affected areas and a higher percentage of cases showed elevated arsenic count, as compared to controls, which may indicate a possible link between arsenic toxicity and this disease. However, a larger sample size is required for a proper correlation. Int J Occup Med Environ Health 2017;30(2):271–279
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2017, 30, 2; 271-279
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and Characterization of N-Methyl Indole Derivatives via Desulfitative Displacement by Various Amines and Its Antimicrobial Activity
    Autorzy:
    Chodvadiya, Vijay D.
    Pambhar, Kaushik D.
    Parmar, Nilesh D.
    Dhamsaniya, Ashish P.
    Safi, Shahrukh khan A.
    Chhatbar, Pratiksha V.
    Ram, Hemal N.
    Khunt, Ranjan C.
    Patel, P. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1065130.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Anti-microbial agents
    Desulfitative displacement
    N-methyl indole
    S-methyl
    Opis:
    A modular three step synthetic approach of N-methyl indole derivatives has been carried out by the condensation of N-methyl indole with cyanoacetic acid using acetic anhydride as solvent to yield 3-cyanoacetyl N-methyl indole, which further reacts with carbon disulphide and methyl iodide in basic condition to obtain 2-(1-methyl-1H-indole-3-carbonyl)-3,3-bis(methylthio)acrylonitrile as a scaffold. Subsequent, the scaffold when reacts with substituted various amine derivatives via desulfitative displacement forms new derivatives of 3-((substitutedphenyl)amino)-2-(1-methyl-1H-indole-3-carbonyl)-3-(methylthio)acrylonitrile in moderate to good yields. All the novel compounds were evaluated for their antimicrobial activity against Gram+ve and Gram-ve bacteria and different fungal species which demonstrated well to moderate antimicrobial activity.
    Źródło:
    World Scientific News; 2019, 120, 2; 181-191
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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