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    Wyświetlanie 1-21 z 21
    Tytuł:
    Effect of Diffusion on (ZrO$\text{}_{2}$)$\text{}_{0.8}$(Y$\text{}_{2}$O$\text{}_{3}$)$\text{}_{0.2}$ Ceramic
    Autorzy:
    Sharma, S. V.
    Chand, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933619.pdf
    Data publikacji:
    1995-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.16.-d
    64.80.Gd
    66.30.-h
    76.30.Fc
    81.20.Lb
    Opis:
    Effect of iodine and lithium diffusion on undoped and doped (with transition metal ions: Ti, V, Ni, Fe, Cu, Co and Mn) samples of polycrystalline (ΖrO$\text{}_{2}$)$\text{}_{0.8}$(Y$\text{}_{2}$O$\text{}_{3}$)$\text{}_{0.2}$ ceramic has been investigated using X-ray diffraction, scanning electron microscopy and electron paramagnetic resonance.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 3; 503-509
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural and Electrical Conductivity Studies of Doped ZnS
    Autorzy:
    Sharma, S. V.
    Chand, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1920763.pdf
    Data publikacji:
    1992-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.Kb
    64.80.Gd
    66.90.+r
    Opis:
    The effect of cobalt impurities on transport and structural properties of doped ZnS has been studied through electrical resistivity, X-ray diffraction and scanning electron microscopy. Correlating the results obtained, it has been shown that the Co concentrations considerably influence the transport properties as well as the structural features, in particular the β → α phase transformation of ZnS.
    Źródło:
    Acta Physica Polonica A; 1992, 81, 6; 653-658
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural and Electron Paramagnetic Resonance Studies of (ZrO)$\text{}_{0.8}$(Y$\text{}_{2}$O$\text{}_{3}$)$\text{}_{0.2}$
    Autorzy:
    Shukla, N. L.
    Sharma, S. V.
    Chand, P.
    Misra, B. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929172.pdf
    Data publikacji:
    1993-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.16.-d
    61.10.Lx
    76.30.Fc
    Opis:
    The polycrystalline samples of copper and vanadium doped as well as undoped (ZrO)$\text{}_{0.8}$(Y$\text{}_{2}$O$\text{}_{3}$)$\text{}_{0.2}$ were synthesized and studied using X-ray diffraction, scanning electron microscopy and electron paramagnetic resonance (EPR) techniques in order to investigate their structural and magnetic behaviour. The effect of exposure to lithium vapours on the host lattice of these ceramic materials is also studied using EPR technique. It has been observed from X-ray diffraction study that the samples consist of mainly two phases monoclinic and tetragonal. The monoclinic phase is in dominant proportion. Scanning electron microscope study showed that the morphology of the samples is similar to each other. EPR studies showed interesting changes on diffusion of lithium into the lattice of the host materials.
    Źródło:
    Acta Physica Polonica A; 1993, 83, 4; 441-449
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dispersion of Rayleigh Waves in a Microstructural Couple Stress Substrate Loaded with Liquid Layer Under the Effects of Gravity
    Autorzy:
    Sharma, V.
    Kumar, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/947783.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    couple stress theory
    Rayleigh waves
    gravity
    characteristic length
    liquid loading
    Opis:
    Bone loss is one of the serious health issues in bedridden patients or young generation due to lack of physical activities. Mechanical forces are exerted on the bones through ground reaction forces, liquid loadings and by other contraction activities of the muscles. We are assuming an isotropic half-space with mechanical properties equivalent to that of bone exhibiting microstructures. Consistent couple stress theory introduces an additional material parameter called characteristic length which accounts for inner microstructure of the material. Dispersion relations for leaky Rayleigh waves are derived by considering a model consisting of couple stress half space under the effects of gravity and loaded with inviscid liquid layer of finite thickness or a liquid half space. Impact of the gravity, liquid loadings and microstructures of the material are investigated on propagation of leaky Rayleigh type waves. Phase velocity of leaky Rayleigh waves is studied for five different values of characteristic length parameter which are of the order of internal cell size of the considered material. Variations in phase velocity of leaky Rayleigh waves are also studied under the effect of gravity parameter and thickness of liquid loadings.
    Źródło:
    Archives of Acoustics; 2018, 43, 1; 11-20
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dispersion of SH waves in a viscoelastic layer imperfectly bonded with a couple stress substrate
    Autorzy:
    Sharma, V.
    Kumar, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/949130.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    SH waves
    couple stress theory
    imperfect bonding
    characteristic length
    viscoelasticity
    Opis:
    The paper deals with propagation of SH waves in a viscoelastic layer over a couple stress substrate with imperfect bonding at the interface. A dispersion equation of SH waves in a viscoelastic layer overlying the couple stress substrate with an imperfect interface between them has been obtained. Dispersion equations for propagation of SH waves with perfectly bonded interface and slippage interface between two media are also obtained as particular cases. Effects of the degree of imperfectness of the interface are studied on the phase velocity of SH waves. The dispersion curves are plotted and the effects of material properties of both couple stress substrate and viscoelastic layer are studied. The effects of internal microstructures of the couple stress substrate in terms of characteristic length of the material are presented. The effects of heterogeneity, friction parameter and thickness of the viscoelastic layer are also studied on the propagation of SH waves.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2017, 55, 2; 535-546
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of liquid loadings on lamb waves in context of size dependent couple stress theory
    Autorzy:
    Sharma, V.
    Kumar, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/949331.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    couple stress
    characteristic length
    Lamb waves
    elastic waves
    liquid loadings
    Opis:
    For understanding the effects of an internal microstructure, generalised microcontinuum theories with additional microstructural parameters are developed. One such a parameter, called the characteristic length of the material comparable with the internal cell size of the material is involved in the couple stress theory. The problem of propagation of Lamb waves in a plate with an internal microstructure and loaded with an inviscid liquid on both sides is studied using the couple stress theory. The dispersion equation of Lamb waves with the liquid loadings is derived. The impact of the liquid loadings is studied on the propagation of Lamb waves. The effect of the characteristic length is also studied on the phase velocity of Lamb waves in the plate for various modes in the presence of liquid loadings.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2015, 53, 4; 925-934
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Linear stability analysis for ferromagnetic fluids in the presence of magnetic field, compressibility, internal heat source and rotation through a porous medium
    Autorzy:
    Kumar, K.
    Singh, V.
    Sharma, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/279562.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    ferrofluids
    rotation
    magnetic field
    porous medium
    heat source
    compressibility
    Opis:
    The effects of magnetic field and heat source strength on thermal convection of a compressible rotating ferromagnetic fluid through a porous medium are investigated theoretically using linear stability theory. A normal mode analysis method is employed to find solutions for the fluid layer confined between parallel planes with free boundaries. The cases of stationary and oscillatory instabilities are discussed. For the stationary state, compressibility, medium porosity and temperature gradient due to heat source have destabilizing effects, whereas rotation and ratio of magnetic permeability delay the onset of convection. The magnetic field and medium permeability have both stabilizing and destabilizing effects under certain conditions. The variations in the stationary critical thermal Rayleigh number and neutral instability curves in (Ra1, x)-plane for various values of physical parameters are shown graphically to depict the stability characteristics. The sufficient conditions for the non-existence of overstability are obtained and the principle of exchange of stabilities holds true in the absence of magnetic field and rotation under certain conditions.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2015, 53, 4; 1067-1081
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Turnover of cell wall components during sink development in seeds of three cotton genotypes
    Autorzy:
    Sharma, R.K.
    Thaker, V.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2199019.pdf
    Data publikacji:
    2006-06-22
    Wydawca:
    Instytut Hodowli i Aklimatyzacji Roślin
    Tematy:
    Cotton seeds
    Gossypium Pectic substances
    Sink size
    Water amount
    Xyloglucans
    Opis:
    Size of the cells in developing seed is one of the major factors that regulate yield potentials. Seed of three cotton genotypes, Gossypium hirsutum. L cv (H-4; H-8) G. herbaceum L. cv (G. Cot-15) exhibits variation in their final seed size (large, middle and smaller) were studied for growth and changes in cell wall components during entire period of seed development. High and low molecular weight xyloglucan contents were extracted with 1M and 4M alkali, respectively. Initially the high and low molecular weight xyloglucan contents remained low and increased when cell size stabilized. Changes in esterified and non-esterified pectic substances were also fractionated from the cell wall of developing seed and theirs role in cell elongation phase is discussed. It was observed that bigger seed has higher xyloglucan contents than that of middle and smaller sized seed. Pectic substances were higher during elongation phase in all genotypes. The role of these polysaccharides in sink size development is discussed.
    Źródło:
    Plant Breeding and Seed Science; 2006, 53; 9-16
    1429-3862
    2083-599X
    Pojawia się w:
    Plant Breeding and Seed Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical study on the effects of multiple internal diathermal obstructions on natural convection in a fluid-saturated porous enclosure
    Autorzy:
    Chordiya, J. S.
    Sharma, R. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/139520.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermal insulation
    natural convection
    internal obstructions
    porous enclosure
    Darcy's law
    izolacja termiczna
    konwekcja naturalna
    przeszkody wewnętrzne
    obudowa porowata
    prawo Darcy'ego
    Opis:
    The present work aims at studying the effects of orientation, size, position, and the combination of multiple internal diathermal obstructions in a fluid-saturated square porous enclosure, generally encountered in thermal insulations. The overall objective is to suppress the natural convection fluid flow and heat transfer across a differentially heated porous enclosure. To serve this purpose, multiple diathermal obstructions are employed to mechanically protrude into a porous medium. It is sought to estimate the effect of various types of orientation, clustering and alternate positioning of obstructions by considering number of obstructions (Np), length of obstructions (λ), modified Rayleigh number (Ra*) on local and average Nusselt number (Nu). The Darcy model for porous media is solved using Finite difference method along with Successive Accelerated Replacement scheme. One of the findings is that the value of the Nusselt number decreases by increasing both, the number of obstructions as well as the length of obstructions irrespective of its orientation and positioning. The reduction in Nusselt number is significant with obstructions attached on lower half of the hot wall and/or on upper half of cold wall. In addition, the overall reduction in Nusselt number is slightly greater with obstructions attached explicitly to the cold wall.
    Źródło:
    Archive of Mechanical Engineering; 2018, LXV, 4; 553-578
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Conservation of the endangered medicinal plant Picrorhiza kurroa through in vitro multiple shoot regeneration
    Autorzy:
    Chaudhary, V.
    Singh, S.
    Sharma, R.
    Singh, A.
    Sharma, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/80933.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    medicinal plant
    Picrorhiza kurroa
    endangered plant
    shoot regeneration
    micropropagation
    conservation
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2019, 100, 3
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimation of acoustically induced refractive index perturbation in silicon and germanium slab for optical applications
    Autorzy:
    Sharma, G.
    Kumar, S.
    Kumar, D.
    Singh, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/173371.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    dispersion relation
    Lamb wave mode in silicon and germanium
    displacement field
    refractive index modulation
    Opis:
    In-plane displacement field and refractive index variation for silicon and germanium in the presence of Lamb wave is estimated for optical applications. The required dispersion equation in a thin silicon and germanium plates is obtained using the method of potentials with boundary conditions involving the bulk and surface stress of the materials considered. The eigen-values thus obtained are used to compute the Lamb wave modes for the slab of silicon and germanium at same thickness. The fundamental anti-symmetric and symmetric plate modes and their overtones are observed due to confinement of acoustic energy within the slab thickness. In addition, the excited symmetric modes in silicon have longer wavelengths than those of germanium at a fixed frequency. Therefore, the refractive index modulation through the Lamb wave in silicon is always larger as compared to that of germanium. This refractive index modulation can be treated as periodic sinusoidal refractive index variation and may be considered as a tunable one-dimensional photonics crystal.
    Źródło:
    Optica Applicata; 2015, 45, 4; 491-500
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and optical characteristics of silver nanoparticles on different substrates
    Autorzy:
    Budhiraja, N.
    Sharma, A.
    Dahiya, S.
    Parmar, R.
    Vidyadharan, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/411878.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Nanoparticle
    Crystallography
    Topography
    XRD
    SEM
    UV-VIS
    Opis:
    Silver nanoparticles have been deposited on glass and polyethylene substrate by Chemical Bath Deposition (CBD) technique and Chemical rolling method. A comparative study has shown that Chemical bath technique is superior compared to rolling technique for uniform deposition of silver nanoparticles on glass substrate. Crystallography investigation of these materials is done by X-ray diffraction (XRD) which reveals that average grain size is in nano region. Scanning Electron Microscope (SEM) is used for topography study of these prepared nanostructures. Optical properties of the synthesized materials are studied by UV-VIS in detail to check their potential for next era industrial revolution.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 14; 80-88
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phytochemical and pharmacological aspects of Nothapodytes nimmoniana. An overview
    Profil fitochemiczny i farmakologiczny Nothapodytes nimmoniana. Przegląd
    Autorzy:
    Khan, N.
    Tamboli, E.T.
    Sharma, V.K.
    Kumar, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/72676.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Włókien Naturalnych i Roślin Zielarskich
    Tematy:
    phytochemistry
    pharmacology
    Nothapodytes nimmoniana
    Icacinaceae
    camptothecin
    medicinal property
    human disease
    treatment
    Opis:
    Nothapodytes nimmoniana (J. Graham) (Icacinaceae), commonly known as Amruta is found in India particularly in Maharashtra, Goa, Kerala, Assam, Jammu and Kashmir as well as Tamilnadu areas. It is an important medicinal plant, the major source of a potent alkaloid, namely camptothecin, of a wide spectrum of pharmacological activities like anti-cancer, anti-HIV, antimalarial, antibacterial, anti-oxidant, anti-inflammatory, anti-fungal and also applied in the treatment of anaemia. Camptothecin is still not synthesized, therefore, its production entirely depends on natural sources. N. nimmoniana is one such plant which yields contain camptothecin in significantly high amount. The plant is gaining international recognition due to its diversified medicinal uses. It is subjected to excessive harvest. It has been categorized as a vulnerable and endangered plant. The present review encompasses the phytochemical, analytical, pharmacological, biotechnological, and other specific aspects of N. nimmoniana.
    Nothapodytes nimmoniana (J. Graham) (Icacinaceae), powszechnie znana jako Amruta, rośnie w Indiach, szczególnie w prowincjach Maharashtra, Goa, Kerala, Assam, Dżammu i Kaszmir, a także na niektórych obszarach Tamilnadu. Jest jedną z ważnych roślin leczniczych, głównym źródłem silnego alkaloidu, kamptotecyny, mającej szerokie spektrum działania: przeciwnowotworowe, anty-HIV, antymalaryczne, antybakteryjne, przeciwutleniające, przeciwzapalne, przeciwgrzybicze. Znajduje również zastosowanie w leczeniu anemii. Jak dotąd kamptotecyna nie została zsyntetyzowana, dlatego jej produkcja całkowicie zależy od źródeł naturalnych. N. nimmoniana jest jedną z roślin zawierających duże ilości kamptotecyny. Zyskała ona międzynarodowe uznanie dzięki szerokiemu spektrum zastosowań, co powoduje zwiększenie jej eksploatacji. Z tego powodu została uznana za gatunek zagrożony. Poniższy przegląd obejmuje badania fitochemiczne, analityczne, farmakologiczne, biotechnologiczne i inne prowadzone nad gatunkiem N. nimmoniana.
    Źródło:
    Herba Polonica; 2013, 59, 1
    0018-0599
    Pojawia się w:
    Herba Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Stannous-Cerium Oxide Nanocomposites as Nanofilm, Nanodot and Nanorod
    Autorzy:
    Budhiraja, N
    Sharma, A.
    Kumar, S.
    Kaur, A.
    Unikrishnan, N. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/411664.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    nanofilms
    Nanowires
    nanoparticles
    Crystallography
    Topography
    Opis:
    In the present paper, main emphasis is given to synthesize the Stannous-Cerium oxide nanocomposites in nanofilms, nanodots and nanorods by Chemical bath method, Chemical drop method and Chemical rolling Method. These nanocomposite materials are synthesized on a glass substrate at 100 °C temperature. Crystallography investigation of these materials is done by X-ray diffraction (XRD) which reveals that average grain size is 58.9 nm and 62.3 nm for nanofilms and nanodots on glass substrate respectively whereas XRD diffraction for nanorod on glass substrate reveals that material is amorphous in nature.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 14; 69-79
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flavonoids as nutraceuticals. A review
    Flawonoidy jako nutraceutyki - przegląd
    Autorzy:
    Jain, P.K.
    Kharya, M.D.
    Gajbhiye, A.
    Sara, U.V.S.
    Sharma, V.K.
    Powiązania:
    https://bibliotekanauki.pl/articles/71842.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Włókien Naturalnych i Roślin Zielarskich
    Opis:
    Phenolic compounds form one of the main classes of secondary metabolites. They display a large range of structures and are responsible for the major organoleptic characteristics of plant-derived foods and beverages, particularly color and taste properties. They also contribute to the nutritional qualities of fruits and vegetables. Among these compounds, flavonoids constitute one of the most prevailing groups among plant phenolics. Owing to their importance in food organoleptic properties and human health, a better understanding of their structures and biological activities indicates their potentials as therapeutic agents and also for predicting and controlling food quality. Due to the variety of pharmacological activities in the mammalian body, flavonoids are more correctly referred as “nutraceuticals”.
    Związki fenolowe są jedną z głównych grup metabolitów wtórnych. Mogą mieć bardzo różną strukturę i są odpowiedzialne za większość cech organoleptycznych żywności pochodzenia roślinnego i napojów, szczególnie za ich właściwości kolorystyczne i smakowe. Podwyższają także wartości odżywcze owoców i warzyw. Flawonoidy są jedną z największych grup fenoli roślinnych. Lepsze zrozumienie budowy i właściwości biologicznych tych związków może wykazać ich potencjał jako związków leczniczych, a także mających znaczenie w jakości żywności. Ze względu na różnorodność działań farmakologicznych w organizmach ssaków, flawonoidy powinno się nazywać „nutraceutykami”.
    Źródło:
    Herba Polonica; 2010, 56, 2
    0018-0599
    Pojawia się w:
    Herba Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Laser Raman and Infrared Absorption Spectra of 2,4-dichloronitrobenzene
    Autorzy:
    Rastogi, V. K.
    Jain, D. K.
    Mital, H. P.
    Sharma, S. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1887676.pdf
    Data publikacji:
    1991-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.20.Ea
    33.20.Fb
    33.20.Lg
    Opis:
    The laser Raman and infrared absorption spectra of 2,4-dichloronitrobenzene have been recorded in pure liquid state. The vibrational spectra have been analysed assuming C$\text{}_{s}$, point group for the molecule. The assignments for fundamental vibrations, combination and overtone frequencies and internal modes of vibrations of NO$\text{}_{2}$ group have been proposed.
    Źródło:
    Acta Physica Polonica A; 1991, 79, 6; 765-774
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Potentiality assessment of fish scale biodegradation using mangrove fungi isolated from Indian Sundarban
    Autorzy:
    Nandy, V.
    Bakshi, M.
    Ghosh, S.
    Sharma, H.
    Basu, B.R.
    Chaudhuri, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/11014.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    fish scale
    biodegradation
    mangrove
    fungi
    Aspergillus niger
    Penicillium
    Indian Sundarban
    Opis:
    The mangrove fungi, morphologically and physiologically adapted in a different habitat, were isolated from mangrove habitat of Jharkhali, Sundarban, India. The physico-chemical properties like temperature, pH, soil colour, moisture content, carbon and nitrogen content of soil determines the load of microbial population. The soil sample was serially diluted and plated on potato dextrose agar plate with ampicillin to obtain fungal isolates. Total of six isolates were characterized microscopically by lacto phenol cotton blue staining. Two of them were identified as Aspergillus niger and Penicillium sp. and are subjected to biodegradation of fish scale, the major waste of fish processing industries. Aspergillus niger was found to be the best for degradation of fish scale powder by producing zone of clearance. Moreover, media without fish scale didn’t show any zone of clearance indicates the mangrove fungi are capable of degrading the fish scale component.
    Źródło:
    International Letters of Natural Sciences; 2014, 09
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative study for deriving stagedischarge – sediment concentration relationships using soft computing techniques
    Autorzy:
    Sihag, P.
    Sadikhani, M. R.
    Vambol, V.
    Vambol, S.
    Prabhakar, A. K.
    Sharma, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818806.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    sediment load concentration
    Baitarani river
    M5P
    random forest
    ładunek osadu
    stężenie
    rzeka Baitarani
    las losowy
    Opis:
    Purpose: Knowledge of sediment load carried by any river is essential for designing and planning of hydro power and irrigation projects. So the aim of this study is to develop and evaluating the best soft-computing-based model with M5P and Random Forest regressionbased techniques for computation of sediment using datasets of daily discharge, daily gauge and sediment load at the Champua gauging site of the Upper Baitarani river basin of India. Design/methodology/approach: Last few decades, the soft computing techniques based models have been successfully used in water resources modelling and estimation. In this study, the potential of tree based models are examined by developing and comparing sediment load prediction models, based on M5P tree and Random forest regression (RF). Several M5P and RF based models have been applied to a gauging site of the Baitarani River at Odisha, India. To evaluate the performance of the selected M5P and RF-based models, three most popular statistical parameters are selected such as coefficient of correlation, root mean square error and mean absolute error. Findings: A comparison of the results suggested that RF-based model could be applied successfully for the prediction of sediment load concentration with a relatively higher magnitude of prediction accuracy. In RF-based models Qt, Q(t-1), Q(t-2), S(t-1), S(t-2), Ht and H(t-1) combination based M10 model work superior than other combination based models. Another major outcome of this investigation is Qt, Q(t-1) and S(t-1) based model M4 works better than other input combination based models using M5P technique. The optimum input combination is Qt, Q(t-1) and S(t-1) for the prediction of sediment load concentration of the Baitarani River at Odisha, India. Research limitations/implications: The developed models were tested for Baitarani River at Odisha, India.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2021, 104, 2; 57--76
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Passerine birds supporting cross pollination in Erythrina stricta Roxb.
    Autorzy:
    Khanduri, V.P.
    Kumar, K.S.
    Sharma, C.M.
    Riyal, M.K.
    Kar, K.
    Singh, B.
    Sukumaran, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2078260.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    Ornithophily
    pollination
    mating system
    geitonogamy
    pollen grains
    Opis:
    Erythina stricta is an ecologically important tree species in the rainforests of India and its nectar within the flowers contributes to birds’ diet and survival. Reports on the pollination of this species have not been published so far. We therefore explore the reproductive system of this tree species which has great significance to its ecosystem. Birds have an important role in the reproduction of trees through pollination particularly in tropical areas where reproductive success mostly depends on animal pollinator interactions. Study of visitation and nectar feeding behaviour of birds alongwith breeding system assessment of Erythina stricta. Birds visiting and foraging behaviour was observed during Erythrina stricta flowering season in an indian tropical rainforest. Reproductive system was assessed through controlled pollination experiments. Thirteen bird species were recorded visiting and foraging nectar from the flowers of Erythrina stricta. The maximum numbers of visits recorded were from the Red-vented Bulbul (Pycnonotus cafer, Pycnonotidae). The nectar feeding birds were, either (i) potential pollinator with long bills (e.g. Pycnonotus spp., Chloropsis aurifrons, and Dicrurus spp.) or (ii) nectar robbers with comparatively shorter bills (e.g. Zosterops palpebrosa, Stachyris ruficeps, Macronous gularis, Heterophasia glaciris). Controlled pollination experiments revealed high degree of cross pollination (xenogamy) and self-incompatibility in E. stricta. Birds were more frequent in early mornings and their foraging activity was also observed during evening hours; the frequency however, declined with respect to nectar availability. Long corolla tubes of E. stricta could restrict access to nectar collecting bees
    Źródło:
    Dendrobiology; 2021, 85; 117-126
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phytochemical screening of Pulsatilla species and investigation of their biological activities
    Autorzy:
    Laska, G.
    Sienkiewicz, A.
    Stocki, M.
    Zjawiony, J.K.
    Sharma, V.
    Bajguz, A.
    Piotrowska-Niczyporuk, A.
    Jacob, M.
    Khan, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/56981.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Opis:
    The present study aimed to identify biologically active secondary metabolites from the rare plant species, Pulsatilla patens subsp. patens and the cultivated P. vulgaris subsp. vulgaris. Chromatographic fractionation of the ethanolic extract of the roots of P. patens subsp. patens resulted in the isolation of two oleanane-type glycosides identified as hederagenin 3-O-β-d-glucopyranoside (2.7 mg) and hederagenin 3-O-β-d-galactopyranosyl-(1→2)-β-d-glucopyranoside (3.3 mg, patensin). HPLC analysis of the methanolic extract of the crude root of P. patens subsp. patens and P. vulgaris subsp. vulgaris revealed the presence of Pulsatilla saponin D (hederagenin 3-O-α-l-rhamnopyranosyl(1→2)-[β-d-glucopyranosyl(1→4)]-α-l-arabinopyranoside). Chromatographic analysis using GC-MS of the silylated methanolic extracts from the leaves and roots of these species identified the presence of carboxylic acids, such as benzoic, caffeic, malic, and succinic acids. The extracts from Pulsatilla species were tested for their antifungal, antimicrobial, and antimalarial activities, and cytotoxicity to mammalian cell lines. Both P. patens subsp. patens and P. vulgaris subsp. vulgaris were active against the fungus Candida glabrata with the half-maximal inhibitory concentration (IC₅₀) values of 9.37 μg/mL and 11 μg/mL, respectively. The IC₅₀ values for cytotoxicity evaluation were in the range of 32–38 μg/mL for P. patens subsp. patens and 35–57 μg/mL for P. vulgaris subsp. vulgaris for each cell line, indicating general cytotoxic activity throughout the panel of evaluated cancer and noncancer cells.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2019, 88, 1
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Voltage Controlled Terahertz Transmission Enhancement through GaN Quantum Wells
    Autorzy:
    Laurent, T.
    Sharma, R.
    Torres, J.
    Nouvel, P.
    Blin, S.
    Chusseau, L.
    Palermo, C.
    Varani, L.
    Cordier, Y.
    Chmielowska, M.
    Faurie, J.
    Beaumont, B.
    Shiktorov, P.
    Starikov, E.
    Gruzinskis, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1505459.pdf
    Data publikacji:
    2011-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.20.-e
    78.67.De
    73.21.Fg
    Opis:
    We report transmission measurements of GaN quantum well grown on sapphire substrate in the 220-325 GHz frequency band at low temperatures. A significant enhancement of the transmitted beam intensity with the applied voltage on the devices under test is found.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 2; 107-110
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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