Informacja

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

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

Wyszukujesz frazę "rao, V.V." wg kryterium: Autor

  Lista filtrów
Wyrównaj
    Wyświetlanie 1-34 z 34
    Tytuł:
    An analytical study on buckling behavior of CNT/polymer composite plates using the first order shear deformation theory
    Autorzy:
    Peyyala, P. K.
    Subba Rao, V. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/281618.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    buckling
    carbon nanotube
    composite plates
    micromechanics
    FSDT
    Opis:
    Most plates used in engineering structures such as aircraft wings, ship ducts and buildings, although quite capable of resisting tensile loads, are poor in withstanding compression. In order to avoid premature failure under compression, it is important to know buckling behavior of the plate. This article primarily deals with the analytical study of buckling behavior of a carbon nanotube reinforcing polymer composite plates based on the first order shear deformation theory by employing Mori-Tanaka micromechanics approach to obtain elastic properties. In this investigation, an attempt is made for evaluating the effect of plate thickness, CNT volume fraction, stacking sequence and CNT radii on the buckling of plates.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2018, 56, 1; 71-79
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exotic floristic composition of Peddagattu, the proposed site for Uranium mining, Nalgonda district, Telangana state, India
    Autorzy:
    Reddy, A.B.
    Rao, V.H.
    rao, V.V.
    Reddy, A.V.B.
    Powiązania:
    https://bibliotekanauki.pl/articles/11325.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Opis:
    The present investigation reflects the findings of exotic floristic composition at Peddagattu, Nalgonda district, Telangana State, India. A total of 125 exotic species of taxa belonging to 101 genera and 44 families were recorded in the study. Leguminosae is the most dominant family representing with 21 species, followed by Compositae (14 species), Apocynaceae, Convolvulaceae and Poaceae (7 species each). As per the nativity of exotic species representation in the study area are mostly from belongs to tropical America followed by tropical Africa and South America at Peddagattu.
    Źródło:
    International Letters of Natural Sciences; 2015, 43
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On Borel structures
    Autorzy:
    Rao, B. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/725610.pdf
    Data publikacji:
    1970
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Źródło:
    Colloquium Mathematicum; 1970, 21, 2; 199-204
    0010-1354
    Pojawia się w:
    Colloquium Mathematicum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Remarks on vector sums of Borel sets
    Autorzy:
    Rao, B. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/725462.pdf
    Data publikacji:
    1972
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Źródło:
    Colloquium Mathematicum; 1972, 25, 1; 103-104
    0010-1354
    Pojawia się w:
    Colloquium Mathematicum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Borel structures for function spaces
    Autorzy:
    Rao, B. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/727624.pdf
    Data publikacji:
    1971
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Źródło:
    Colloquium Mathematicum; 1971, 23, 1; 33-38
    0010-1354
    Pojawia się w:
    Colloquium Mathematicum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lattice of Borel structures
    Autorzy:
    Rao, B. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/727900.pdf
    Data publikacji:
    1971
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Źródło:
    Colloquium Mathematicum; 1971, 23, 2; 213-216
    0010-1354
    Pojawia się w:
    Colloquium Mathematicum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improved Estimators of Coefficient of Variation in a Finite Population
    Autorzy:
    Archana, V.
    Aruna Rao, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/465691.pdf
    Data publikacji:
    2011
    Wydawca:
    Główny Urząd Statystyczny
    Tematy:
    Model based comparison
    Coefficient of Variation
    Simple Random Sampling Regression estimator
    Mean Square Error
    Confidence interval
    Opis:
    Coefficient of Variation (C.V) is a unitless measure of dispersion. Hence it is widely used in many scientific and social investigations. Although a lot of work has been done concerning C.V in the infinite population models, it has been neglected in the finite populations. Many areas of applications of C.V involves the finite populations like the use in official statistics and economic surveys of the World Bank. This has motivated us to propose six new estimators of the population C.V. In finite population studies regression estimators are widely used and the idea is exploited to propose the new estimators. Three of the proposed estimators are the regression estimators of the C.V for the study variable while the other three estimators makes use of the regression estimators of population mean and variance to estimate the ratio , the population C.V for the study variable. The bias and mean square error (MSE) of these estimators were derived for the simple random sampling design. The performance of these estimators is compared using two real life data sets. The simulation is carried out to compare the estimators in terms of coverage probability and the length of the confidence interval. The small sample comparison indicates that two of the proposed estimators perform better than the sample C.V. The regression estimator using the information on the Population C.V of the auxiliary variable emerges as the best estimator.
    Źródło:
    Statistics in Transition new series; 2011, 12, 2; 357-380
    1234-7655
    Pojawia się w:
    Statistics in Transition new series
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Factors affecting the mechanical properties of compact bone and miniature specimen test techniques: a review
    Autorzy:
    Chittibabu, V.
    Rao, S. K.
    Rao, G. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/103085.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    mechanical properties
    compact bone
    miniature specimen
    small punch test
    finite element simulation
    inverse finite element procedure
    Opis:
    This paper presents the review concerning mechanical properties of bone and the miniature specimen test techniques. For developing a realistic understanding of how factors such as moisture content, mineralization, age, species, location, gender, rate of deformation etc. affect the mechanical properties of bone, it is critical to understand the role of these factors. A general survey on existing research work is presented on this aspect. The essential features of miniature specimen test techniques are described, along with the application of small punch test method to evaluate the mechanical behavior of materials. The procedure for the determination of tensile and fracture properties, such as: yield strength, ultimate strength, ductility, fracture toughness etc. using small punch test technique have been described. The empirical equations proposed by various investigators for the prediction of tensile and fracture properties are presented and discussed. In some cases, the predictions of material properties have been essentially made through the finite element simulation. The finite element simulation of miniature specimen test technique is also covered in this review. The use of inverse finite element procedure for the prediction of uniaxial tensile constitutive behaviour of materials is also presented.
    Źródło:
    Advances in Science and Technology. Research Journal; 2016, 10, 32; 169-183
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phytosociological studies on tree species of Peddagattu and Sherepally area, a proposed site for Uranium mining project, Nalgonda district, Telangana State, India
    Autorzy:
    Baleeshwar Reddy, A.
    Hanumantha Rao, V.
    Vasudeva Rao, V.
    Vijava Bhasker Reddy, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/11106.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Opis:
    The present study deals with the quantitative floristic inventory of Peddagattu and Sherepally area, Nalgonda district, Telangana State, India. The study resulted in documentation of 50 tree species belongs to 41 genera and 35 families. The families, Mimosaceae, Caesalpiniaceae and Fabaceae are dominated. Among the tree species Cassia fistula has showed highest IVI in Peddagattu, while in Sherepally Albizia amara has recorded highest IVI. Shannon–Wiener index (H') ranges from 2.41 to 3.03. The present study can serve as baseline information for phytosociolgical studies on tree species of Peddagattu and Sherepally area, a proposed site for Uranium mining project, Nalgonda district, Telangan State, India.
    Źródło:
    International Letters of Natural Sciences; 2016, 50
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Value addition to Pongamia biodiesel industry through bioethanol production from pressed oil cake using Bacillus cereus
    Autorzy:
    Venkatesh, K.H.
    Rao, V.C.
    Powiązania:
    https://bibliotekanauki.pl/articles/2096993.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Pongamia pinnata
    oil cake hydrolysate
    bioethanol
    Bacillus cereus
    value addition
    Opis:
    Pongamia pinnata, a tree bearing oil seeds, has been one of the prime focus among nonedible oil sources for biodiesel production in most parts of India. The oil cake obtained after the extraction of oil serves as an adequate source of cellulose, hemicellulose, proteins, lipids, and starch. The scarce literature data available suggest very low conversion rate of complex sugars to fermentable sugars and further to bioethanol. In the present work, a sulfuric acid hydrolysate obtained from Pongamia oil cake (POC) under microwave irradiation was anaerobically fermented using Bacillus cereus ATCC 14579. Under anaerobic and acidic conditions, the process parameters affecting the bioethanol production efficiency (BPE) were screened and optimized using statistical experimental designs. Of the seven parameters screened (glucose concentration, yeast extract as nitrogen source, agitation speed, pH, inoculum size, fermentation time, and temperature), only 3 were found to be significant and to increase BPE. The significant parameters were optimized using the Box-Behnken experimental design to obtain an optimal condition of 9 g/l reducing sugars, pH 4.6 maintained with acetate buffer, and fermentation period of 51 h that yielded 92% BPE with 4.2 g/l ethanol. Moreover, it was observed that the use of a buffer system to maintain broth pH, especially acetate buffer, significantly improved BPE. Low concentration of fermentation inhibitors is the key factor for improved BPE. The research outcome suggests that the production of dual fuel from Pongamia pinnata, viz. biodiesel and bioethanol, could not only improve the process economics but also reduce waste generation.
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2020, 101, 2; 147-158
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Hall currents on unsteady magnetohydrodynamic two-ionized fluid flow and heat transfer in a channel
    Autorzy:
    Raju, T. Linga
    Rao, V. Gowrisankara
    Powiązania:
    https://bibliotekanauki.pl/articles/1839879.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    czujnik Halla
    wymiana ciepła
    magnetohydrodynamika
    Hall currents
    heat transfer
    magnetohydrodynamics
    multi-fluid model
    plasma flows
    Opis:
    An unsteady magnetohydrodynamic (MHD) heat transfer two-fluid flow of ionized gases through a horizontal channel between parallel non-conducting plates, by taking Hall currents into account is studied. The governing partial differential equations that describe the flow and heat transfer under the adopted conditions are solved for the velocity and temperature distributions by a regular perturbation technique. Profiles for the velocity and temperature distributions as well the rates of heat transfer coefficient are presented graphically, and a parametric study is performed. The results reveal that the combined effects of the Hartmann number, Hall parameter, and the ratios of viscosities, heights, electrical and thermal conductivities have a significant impact on an unsteady MHD heat transfer two-ionized fluid flow characteristics.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2021, 26, 2; 84-106
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Localization of Copy-Move Forgery in Speech Signals Through Watermarking Using DCT-QIM
    Autorzy:
    Lalitha, N.V.
    Rao, Ch. Srinivasa
    Jaya-Sree, P.V.Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/227242.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    watermarking
    copy-move forgery
    discrete Cosine
    transform
    quantization index modulation
    hash bits
    Opis:
    Digital speech copyright protection and forgery identification are the prevalent issues in our advancing digital world. In speech forgery, voiced part of the speech signal is copied and pasted to a specific location which alters the meaning of the speech signal. Watermarking can be used to safe guard the copyrights of the owner. To detect copy-move forgeries a transform domain watermarking method is proposed. In the proposed method, watermarking is achieved through Discrete Cosine Transform (DCT) and Quantization Index Modulation (QIM) rule. Hash bits are also inserted in watermarked voice segments to detect Copy-Move Forgery (CMF) in speech signals. Proposed method is evaluated on two databases and achieved good imperceptibility. It exhibits robustness in detecting the watermark and forgeries against signal processing attacks such as resample, low-pass filtering, jittering, compression and cropping. The proposed work contributes for forensics analysis in speech signals. This proposed work also compared with the some of the state-of-art methods.
    Źródło:
    International Journal of Electronics and Telecommunications; 2019, 65, 3; 527-532
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    QoS-based Joint User Selection and Scheduling for MU-MIMO WLANs
    Autorzy:
    Rao, D. S.
    Hency, V. D. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/309403.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    802.11ac
    CSI
    delay
    MMSE
    throughput
    Opis:
    The shift in Multi-User Multiple Input Multiple Output (MU-MIMO) has gained attention due to its wide support in very high throughput Wireless Local Area Networks (WLANs) such as the 802.11ac. However, the full advantage of MU-MIMO can be utilized only with proper user selection and scheduling. Also, providing Quality of Service (QoS) support is a major challenge for these wireless networks. Generally, user scheduling is done with the acquisition of Channel State Information (CSI) from all the users. In MU-MIMO based WLANs, the number of CSI request increases with the number of users. This results in an increased CSI overhead and in degradation of the overall throughput. Most of the proposals in the literature have not addressed the contention in the CSI feedback clearly. Hence, in this paper a Joint User Selection and Scheduling (JUSS) scheme is discussed and its performance is evaluated in terms of throughput, delay, packet loss and fairness. In the performance comparison some wellknown Medium Access Control (MAC) protocols are considered. The proposed scheme not only enhances throughput, but also avoids contention during CSI feedback period.
    Źródło:
    Journal of Telecommunications and Information Technology; 2017, 4; 17-24
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Carbon Particle in Polymer Matrix Composite over Mechanical Properties and Tribology Behavior
    Autorzy:
    Sravanthi, K.
    Mahesh, V.
    Nageswara Rao, Boggarapu
    Powiązania:
    https://bibliotekanauki.pl/articles/2049147.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    carbon
    epoxy
    CNT
    mechanical
    tribological
    Opis:
    In this research, the carbon particle dispersions are made in two different levels as carbon nano tube (CNT) and carbon particle in microns range. The mechanical strength is evaluated for the composites developed by axial loading and bending test analysis. In addition, the air jet abrasive particle erosion study is performed for different angle of impingement. The dispersion of carbon particle in the matrix material has reduced the mechanical strength. The sample with 4% of CNT dispersion in the composite has a maximum strength of 143 MPa and a minimum strength of 112 MPa. For the same combination (4% of CNT composite), the maximum flexural strength is 116 MPa. It is clear to infer that the strength of CNT in matrix materials is superior to the increase in length of carbon particle. The dispersion of carbon particle in the matrix material increases the brittleness and the strength is diminished. During the flexural bending, the fiber delamination occurred with severe deformation in the plain composite. When the materials are subjected to impingement of solid particle, the attrition effect on the exposed surfaces is vulnerable towards erosive mechanism. The presence of carbon in the matrix material has significantly increased the surface property. The results are appreciable for 4% of CNT composite. Especially at 30º, the minimum erosive wear 0.0033 g/g has been recorded. Erosive wear is less at minimum impingement angle and the wear is found increasing at higher impingement angle. Therefore, it is recommended not to add carbon particle to a higher weight percentage, since it leads to brittleness.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 4; 1171-1178
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A piliminary survey of House Sparrow (Passer domesticus) in Ramakrishna Beach Road, Vishakhapatnam (Vizag), Andhra Pradesh
    Autorzy:
    Laxmi Narayana, B.
    Vasudeva Rao, V.
    Sandeep, M.
    Surender, G.
    Ramaligeswara Rao, A.V.L.N.
    Powiązania:
    https://bibliotekanauki.pl/articles/11018.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Opis:
    We studied the population records of House Sparrow Passer domesticus 16th to 20th December 2011 during winter in Ramakrishna Beach Road Vishakhapatnam town, Andhra Pradesh. The ecological density of House Sparrow was investigated using fixed width transects. A total of 189 House sparrows were recorded. The present study shows that a notable population of House Sparrow in Beach Road.
    Źródło:
    International Letters of Natural Sciences; 2015, 04
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi-pronged approach with synergisation of travel modes and institutional linkages – critical for sustenance of urban transportation
    Autorzy:
    Rao, P. Ganeswara
    Kumar, A. Arun
    Shekhar, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1076135.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Linkage
    Multi Pronged Approach
    Travel modes
    Urban Transportation
    Opis:
    Urban areas and metros are growing at a much higher rate than the rural areas. Urban areas play a significant role in the development of the nation by contributing 60% of the national income with only 27.78% of the population. Urban Transport is the most crucial (infrastructure) element in shaping urban development and living. The supply of transport is heterogeneous with a number of interacting and competing modes while the demand for it is derived from the overall pattern of urban activity. Urban Transport has a significant impact on the environment, land use, and land development patterns. In India, multiple institutions are responsible for urban transport and it is governed by multiple policies/ Acts/ legislations. While bus is the major mode of urban transport, local/suburban trains (Railway), Taxies/Autos and personalized transport makeup the rest. Lack of proper public transport has resulted in the increase of personal vehicles, causing problems of congestion, pollution and loss of productive time on travel delays. Study of urban transport systems across the world has revealed that well coordinated institutions with dedicated funding sources and proper planning ensure well functioning urban public transport systems, keeping the cities liveable and productive. Urban transport has to be a public good and be funded through public resources. Indian context have revealed a good beginning made in this direction but absence of institutional arrangements for planning at local level, lack of coordination among various institutions and departments, lack of dedicated funding, lack of inter modal coordination, lack of patronage for new rail based systems are also glaring.
    Źródło:
    World Scientific News; 2019, 116; 46-61
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation on performance of diesel engine using Al2O3 nanofluid as coolant
    Autorzy:
    Rambabu, V.
    Sai Chaitanya, P.
    Prasad Rao, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/102514.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    coolants
    ethylene glycol
    nanofluids
    thermal conductivity
    water
    Opis:
    Water and ethylene glycol as ordinary coolants have been broadly utilized as a part of a car radiator for a long time. These heat exchange liquids offer low thermal conductivity. With the progression of nanotechnology, the new era of heat transfer fluids called, “nanofluids” have been developed and analysts found that these liquids offer higher thermal conductivity contrasted with that of routine coolants. This study concentrated on the utilization of a mixture of water and ethylene glycol based Al2O3 nanofluids in a cooling framework. Pertinent information, nanofluid properties and exact connections were obtained from literature review to examine the performance of a twin cylinder Diesel engine under various blends of nanofluid based coolants, furthermore, to research heat exchange improvement of a car radiator worked with nanofluid-based coolants. It was observed that, the performance of Diesel engine and heat transfer rate in cooling system framework enhanced with the utilization of nanofluids (with water and ethylene glycol the basefluid) contrasted with water and ethylene glycol (i.e. base liquid) alone. In the wake of leading the series of tests on Twin cylinder Diesel engine at 2%, 1% and 0.5% of nanofluid in basefluid, it was observed that performance of Diesel engine and heat exchange is upgraded better at 0.5% of Al2O3 nanofluid coolant.
    Źródło:
    Advances in Science and Technology. Research Journal; 2017, 11, 2; 58-64
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural, Impedance, Dielectric and Modulus Analysis of $Li_{0.5-x}La_{0.5}Ti_{1-x}Nb_{x}O_3$ (x = 0, 0.05, 0.1, and 0.15)
    Autorzy:
    Vijaya Babu, K.
    Veeraiah, V.
    Subba Rao, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1418233.pdf
    Data publikacji:
    2012-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    68.37.Hk
    78.30.-j
    66.10.Ed
    Opis:
    The perovskite lithium lanthanum titanate shows high ionic conductivity at room temperature. Doping the lithium lanthanum titanate by niobium preserves the perovskite structure, which is synthesized by ceramic technology at high temperature (1300°C). The X-ray diffraction and scanning electron microscopy results show that the samples exhibit single phase. AC impedance measurements indicate total conductivity of about $8.93 \times 10^{-4}$ S/cm for composition of x = 0.05 at room temperature. The Raman spectra and cyclic voltammetry results of the compound are also reported.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 4; 688-692
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hepatoprotective and antioxidant activity of Lannea coromandelica Linn. on thioacetamide induced hepatotoxicity in rats
    Autorzy:
    Srinivasa Rao, V.
    Wilkin Einstein, J.
    Das, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/11218.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    hepatoprotective activity
    antioxidant activity
    biochemical parameter
    Lannea coromandelica
    thioacetamide
    hepatotoxicity
    rat
    Opis:
    Hepatoprotective and antioxidant activity of Lannea coromandelica bark extract (LCBE) was investigated on thioacetamide induced hepatotoxicity in rats. Hepatotoxicity was induced by thioacetamide (TAA) administration (100 mg/kg. s.c). LCBE at different doses (400 and 200 mg/kg) were administered orally to male wistar rats. Thioacetamide caused elevation of serum concentration of AST, ALT, ALP, serum bilirubin and also reduced serum concentration of total protein, albumin, sodium, potassium in animals as compared to control (p < 0.05) but LCBE treated rats showed maximum reduction of AST [(138±5.1) IU/L], ALT [(71 ±2.7) IU/L], ALP [(140 ±1.9) IU/L] with the high dose (400 mg/kg bw) of combined aqueous and alcoholic bark extract. Whereas, serum bilurubin, cholesterol, sugar and LDH content were varied with the treatments but showed higher with the only ethanolic extract at dose of 400 mg/kg. The IC50 value was observed as (83.28 ±2.12) μg/mL, for DPPH radical scavenging activity. Result concluded that ethanolic extract and combined aqueous and alcoholic bark extract of L. coromandelica showed a potential hepatoprotective and antioxidant activities might be due to the presence of phenolic groups, terpenoids and alkaloids.
    Źródło:
    International Letters of Natural Sciences; 2014, 03
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of flow pattern on a hydrofoil with structural and profile modification
    Autorzy:
    Chada, Jithendra Sai Raja
    Rao, B. S. V. Rama
    Powiązania:
    https://bibliotekanauki.pl/articles/2106431.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    hydrofoil
    groves
    angle of attack
    CFD
    fine mesh
    validation
    wodolot
    kąt natarcia
    walidacja
    Opis:
    Moving through water takes much more effort than walking through air, and this explains why ships travel much more slowly than automobiles and aircraft. Water is almost 1000 times denser than air, so most of the energy produced by a boat is taken up by dragging (water resistance). Hydrofoils travel much more quickly than ordinary boats, not by pushing through water but by raising the hull (the main body) of the boat upward so it can glide above the waves. Hydrofoil is one of the typical factors that affect the vortex structure and flow characteristics of hydraulic machinery. In order to enhance the utilisation efficiency of hydraulic machinery in marine energy, parallel grooves are proposed and applied to the hydrofoil. Following that, a numerical analysis is performed using the SST k- turbulence model, and the effects of the hydrofoil profile, the angle of attack and the flow are investigated. The profiles of NACA 0066, NACA 8412, NACA M2 and RAE 104 are considered for the study. The performance is analysed based on the lift to drag ratio. The best model from this is given with surface modification and the flow study is carried out at different angles of attack. The modified profile of NACA 8412 with parallel groves has shown the highest lift to drag ratio at a 12 degree angle of attack.
    Źródło:
    Journal of Mechanical and Energy Engineering; 2022, 6, 1; 27--32
    2544-0780
    2544-1671
    Pojawia się w:
    Journal of Mechanical and Energy Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical investigation of stresses induced at blade mounting locations in steam turbine rotor system
    Autorzy:
    Prasad, D. K.
    Ramana, K. V.
    Rao, N. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/947280.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    tarcza wirnika
    wirnik turbiny parowej
    naprężenie styczne
    rotor disc
    radial stress
    tangential stress
    steam turbine rotors
    Opis:
    One of the most common incipient losses of integrity in mechanical structures is the development and propagation of cracks. Especially in rotating members like steam turbine rotors etc. cracks, because of their potential, cause catastrophic failures and are a grave threat to an uninterrupted operation and performance. A crack may propagate from some small imperfections on the surface of the body or inside of the material and it is most likely to appear in correspondence to high stress concentration. Crack propagation path is generally determined by the direction of maximum stress or by the minimum material strength. Hence determination of stresses induced has been the focus of attention for many researchers. In the present work, development of a mathematical model to determine the stresses induced in a rotating disc of varying thickness is studied. This model is applied to a steam turbine rotor disc to determine the induced stresses and radial deflection. The mathematical modeling results are validated with the results obtained using Ansys package. The results of the present study will be useful in diagnosing the location and magnitude of maximum stress induced in the turbine rotor disc and stress intensity factor due to the presence of crack.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2019, 24, 2; 295-307
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A decentralized group signature scheme for privacy protection in a blockchain
    Autorzy:
    Devidas, S.
    Rao Y.V., Subba
    Rekha, N. Rukma
    Powiązania:
    https://bibliotekanauki.pl/articles/1838204.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    blockchain
    decentralization
    e-auction
    group signature
    privacy
    smart contract
    łańcuch bloków
    e-aukcja
    podpis grupy
    inteligentny kontrakt
    Opis:
    Group signature schemes play a vital role in protecting identity privacy of a member of a group who signs a message using the group signature. However, in the existing group signature schemes the centralized group manager has control over all the participants, and these managers can be malicious. They may take a biased decision when there is a dispute among the group members or while revealing the identity of a group member. To overcome the trust issues related to centralized group managers and to improve user privacy, a decentralized group signature scheme (DGSS) is proposed by decentralizing the role of the group manager. The proposed scheme will be more suitable for decentralized environments like a blockchain. Security analysis along with the proof of correctness is also provided for the proposed scheme. A framework for a blockchain-based e-auction protocol using the DGSS is also proposed in this paper.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2021, 31, 2; 353-364
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ethnobotanical study of traditional herbal plants used by local people of Seshachalam Biosphere Reserve in Eastern Ghats, India
    Autorzy:
    Reddy, A.M.
    Babu, M.V.S.
    Rao, R.R.
    Powiązania:
    https://bibliotekanauki.pl/articles/71192.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Włókien Naturalnych i Roślin Zielarskich
    Tematy:
    ethnobotany
    ethnomedicine
    traditional plant
    herbal plant
    species list
    drug development
    local people
    people
    Seshachalam Biosphere Reserve
    India
    Opis:
    Introduction: Ethnobotany is the study of medicinal plants used by local people, with particular importance of old-styled tribal beliefs and information. Ethnobotanical studies focus on ethnic knowledge of Adivasi people and development of data bases on ethnic knowledge but also focuses on preservation and regeneration of traditional beliefs and maintenance of traditional knowledge. Objective: The aim of present study is to highlight the traditional actions of herbal plants used by inborn Yanadi community of Seshachalam Biosphere Reserve, Eastern Ghats of Andhra Pradesh, India. Methods: The ethnobotanical field survey was conducted according to the methods adopted by some authors. In-depth interviews, interactions were conducted with tribal physicians of Yanadi, Nakkala and Irula as well as other tribes practicing and experiencing the use of plant-based medicine. A normal inquiry form was used to gather the appropriate data on herbal plants and their usage of inborn people’s lifestyle. Extensive consultations among local people and detailed documentation of the usage of plants were carried out in 2014–2017. The aged outmoded opinions and imposts of indigenous people conceded on by word of opening were documented. Results: A total of 266 medicinally used plant species belonging to 216 genera and 88 families were recognized with help of inborn herbal healers. The study also chronicled the mode of herbal arrangements, mode of the use of herbal plants in various disorders. The study exposed that native people of Seshachalam Biosphere Reserve have good medicinal information and also have preserved plant-based medicinal system of their ascendants used all their diseases. Most of medicinal plants are used in the treatment of indigestion, snake bite and skin diseases. The authors feel that this type of study certainly helps identify ethnic leads for drug development in future. Conclusions: The ethnobotanical investigation of Seshalam Biosphere area has revealed that the tribes possess good knowledge on plant-based medicine but as they are towards in advanced exposure to transformation, their information on traditional uses of plants is slowly getting eroded. The authors plead for intensive crosscultural studies involving all ethnic tribes in the country for prioritizing or short listing of ethnic leads for various disorders for ultimately developing global level drugs for human welfare and economy development.
    Źródło:
    Herba Polonica; 2019, 65, 1
    0018-0599
    Pojawia się w:
    Herba Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative performance with different versions of low heat rejection combustion chambers with crude rice bran oil
    Porównanie osiągów różnych wersji komór spalania o małych stratach ciepła przy wykorzystaniu surowego oleju roślinnego z otrąb ryżowych
    Autorzy:
    Murali, K. M. V. S.
    Rao, N. D. P.
    Prasad, B. A.
    Murthy, P. V. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/140033.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    alternate fuels
    vegetable oil
    biodiesel
    LHR engine
    fuel performance
    exhaust emissions
    combustion characteristics
    paliwa alternatywne
    olej roślinny
    silnik o małych stratach ciepła
    wydajność paliwa
    emisja spalin
    charakterystyka spalania
    Opis:
    It has been found that the vegetable oils are promising substitute, because of their properties are similar to those of diesel fuel and they are renewable and can be easily produced. However, drawbacks associated with crude vegetable oils are high viscosity, low volatility call for low heat rejection combustion chamber, with its significance characteristics of higher operating temperature, maximum heat release, and ability to handle lower calorific value (CV) fuel etc. Experiments were carried out to evaluate the performance of an engine consisting of different low heat rejection (LHR) combustion chambers such as ceramic coated cylinder head-LHR-1, air gap insulated piston with superni (an alloy of nickel) crown and air gap insulated liner with superni insert – LHR-2; and ceramic coated cylinder head, air gap insulated piston and air gap insulated liner – LHR-3 with normal temperature condition of crude rice bran oil (CRBO) with varied injector opening pressure. Performance parameters (brake thermal efficiency, brake specific energy consumption, exhaust gas temperature, coolant load, and volumetric efficiency) and exhaust emissions [smoke levels and oxides of nitrogen [NOx]] were determined at various values of brake mean effective pressure of the engine. Combustion characteristics [peak pressure, time of occurrence of peak pressure, maximum rate of pressure rise] were determined at full load operation of the engine. Conventional engine (CE) showed compatible performance and LHR combustion chambers showed improved performance at recommended injection timing of 27 degrees bTDC and recommend injector opening pressure of 190 bar with CRBO operation, when compared with CE with pure diesel operation. Peak brake thermal efficiency increased relatively by 7%, brake specific energy consumption at full load operation decreased relatively by 3.5%, smoke levels at full load decreased relatively by 11% and NOx levels increased relatively by 58% with LHR-3 combustion chamber with CRBO at an injector opening pressure of 190 bar when compared with pure diesel operation on CE.
    Jak wiadomo, oleje roślinne są obiecującym substytutem paliw ropopochodnych, ponieważ ich właściwości są podobne do oleju dieslowskiego, są odnawialne i łatwe do wyprodukowania. Niemniej, surowe oleje roślinne wykazują wady, takie jak wysoka lepkość i mała lotność, co wymaga komory spalania o małych stratach ciepła, której istotnymi cechami są m.in. wyższa temperatura robocza, maksymalne wydzielanie ciepła i zdolność do wykorzystania paliwa o mniejszej wartości kalorycznej (CV). Przeprowadzono eksperymenty mające na celu ocenę osiągów silnika z różnymi komorami spalania o małych stratach ciepła (LHR), takich jak głowica cylindra o pokryciu ceramicznym (LHR-1), tłok izolowany szczeliną powietrzną z denkiem ze stopu Superni (superstop niklu) i tuleją cylindra z wkładką z Superni izolowaną szczeliną powietrzną (LHR-2) oraz głowica cylindra z pokryciem ceramicznym, tłok i tuleja cylindra izolowane szczelinami powietrznymi (LHR-3). Badania prowadzono przy normalnej temperaturze oleju roślinnego (surowy olej z otrąb ryżowych, CRBO) i zmiennym ciśnieniu w otworze wtryskiwacza. Parametry osiagów silnika (użyteczna sprawność termiczna, użyteczny współczynnik zużycia energii, temperatura gazu wydychanego, obciążenie obiegiem chłodziwa i współczynnik napełnienia) oraz emisje wydechowe [poziomy dymu i tlenków azotu, NOx] zostały wyznaczone przy różnych wartościach średniego użytecznego ciśnienia w silniku. Charakterystyki spalania [ciśnienie szczytowe, czas występowania ciśnienia szczytowego, maksymalna szybkość wzrostu ciśnienia] zostały wyznaczone w warunkach pracy silnika z pełnym obciążeniem. W porównaniu z silnikiem napędzanym olejem diesla, silnik konwencjonalny (CE) wykazał podobne osiągi przy pracy z olejem roślinnym (CRBO), a w komorach spalania o małych stratach ciepła (LHR) uzyskano lepsze osiągi przy zalecanym kącie wtrysku 27b stopni TDC (przed górnym punktem zwrotnym) i zalecanym ciśnieniu w otworze wtryskiwacza równym 190 bar. Szczytowa użyteczna sprawność cieplna wzrosła relatywnie o 7%, użyteczny współczynnik zużycia energii zmalał o 3,5% przy pracy z pełnym obciążeniem, poziomy dymu przy pełnym obciążeniu zmalały o 11%, a poziom tlenków NOx wzrósł relatywnie o 58% w przypadku komory spalania typu LHR-3 napędzanej olejem roślinnym CBRO przy ciśnieniu w otworze wtryskiwacza 190 bar, w porównaniu z parametrami uzyskanymi przy pracy z czystym olejem diesla.
    Źródło:
    Archive of Mechanical Engineering; 2014, LXI, 4; 627-651
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Emission Spectra of Triple Activated SrS Phosphors
    Autorzy:
    Rao, A. P.
    Sinha, O. P.
    Machwe, V. G.
    Mehta, A. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1945381.pdf
    Data publikacji:
    1996-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.50.-j
    Opis:
    Fluorescence spectra of strontium sulphide phosphors activated by three activators viz. Mn, Cu, and Gd individually and in different combinations have been discussed at length. X-ray is used as excitation source. Probable inferences are drawn regarding energy transfer phenomenon. The two channels for transfer of energy are concluded in present phosphor series. A model is also proposed.
    Źródło:
    Acta Physica Polonica A; 1996, 89, 4; 509-516
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The role of lysine-256 in the structure and function of sheep liver recombinant serine hydroxymethyltransferase
    Autorzy:
    Talwar, Rashmi
    Jagath, Junutala
    Datta, Asis
    Prakash, V.
    Savithri, Handanahal
    Rao, Naropantul
    Powiązania:
    https://bibliotekanauki.pl/articles/1044892.pdf
    Data publikacji:
    1997
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Źródło:
    Acta Biochimica Polonica; 1997, 44, 4; 679-688
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Indirect torque observer-based sensor-less efficient control of bearingless switched reluctance motor using global sliding mode and square currents control method
    Autorzy:
    Rao, Pulivarthi Nageswara
    Devarapalli, Ramesh
    Marquez, Fausto Pedro Garcia
    Kumar, G. V. Nagesh
    Mohammadi-Ivatloo, Behnam
    Powiązania:
    https://bibliotekanauki.pl/articles/1409027.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bearingless
    global sliding mode
    efficient: maintenance
    safety
    torque ripple
    Opis:
    The Bearingless Switched Reluctance Motor (BSRM) is a new technology motor, which overcomes the problems of maintenances required associated with mechanical contacts and lubrication of rotor shaft effectively. In addition, it also improves the output power developed and rated speed. Hence, the BSRM can achieve high output power and super high speed with less size and cost. It has a considerable ripple in the net-torque due to its critical non-linearity and the salient pole structures of both stator and rotor poles. The resultant torque ripple, especially in these motors, causes the more vibrations and acoustic noises will affects the levitated rotor safety also. Practically at high-speed operations, the accurate measurement of the rotor position is complicated for conventional mechanical sensors. A new square currents control with global sliding mode control based sensorless torque observer is proposed to minimize the torque ripple and achieve a smooth, robust operation without using any mechanical sensors. The proposed controller is designed based on the error between the reference and measured torque values. The sliding mode torque observer measures the torque from the actual phase voltages, currents, and look-up tables. The simulation model has been modelled to validate the proposed methodology. From the simulation outputs, it is clear that the reduction of torque ripple by the proposed method shows improved than the conventional sliding mode controller. The overall system is more robust to the external disturbances, and it also gets efficient torque profile.
    Źródło:
    Archives of Control Sciences; 2021, 31, 1; 53-80
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Conjoined twins – role of imaging and recent advances
    Bliźnięta nierozdzielone – rola badań obrazowych oraz nowe technologie
    Autorzy:
    Mathew, Rishi Philip
    Francis, Swati
    Basti, Ram Shenoy
    Suresh, Hadihally B.
    Rajarathnam, Annie
    Cunha, Prema D.
    Rao, Sujaya V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033313.pdf
    Data publikacji:
    2017
    Wydawca:
    Medical Communications
    Tematy:
    3D printing
    cephalopagus
    conjoined twins
    omphalopagus
    thoracopagus
    Opis:
    Introduction: Conjoined twins are identical twins with fused bodies, joined in utero. They are rare complications of monochorionic twinning. The purpose of this study is to describe the various types of conjoined twins, the role of imaging and recent advances aiding in their management. Material and methods: This was a twin institutional study involving 3 cases of conjoined twins diagnosed over a period of 6 years from 2010 to 2015. All the 3 cases were identified antenatally by ultrasound. Only one case was further evaluated by MRI. Results: Three cases of conjoined twins (cephalopagus, thoracopagus and omphalopagus) were accurately diagnosed on antenatal ultrasound. After detailed counseling of the parents and obtaining written consent, all the three cases of pregnancy were terminated. Delivery of the viable conjoined twins was achieved without any complications to the mothers, and all the three conjoined twins died after a few minutes. Conclusion: Ultrasound enables an early and accurate diagnosis of conjoined twins, which is vital for obstetric management. MRI is reserved for better tissue characterization. Termination of pregnancy when opted, should be done at an early stage as later stages are fraught with problems. Recent advances, such as 3D printing, may aid in surgical pre-planning, thereby enabling successful surgical separation of conjoined twins.
    Wstęp: Bliźnięta nierozdzielone to bliźnięta jednojajowe zrośnięte ze sobą w życiu płodowym. Jest to rzadkie powikłanie wśród bliźniąt jednokosmówkowych. Celem niniejszej pracy było przedstawienie różnych rodzajów bliźniąt nierozdzielonych, a także omówienie roli badań obrazowych oraz nowych technologii usprawniających postępowanie w takich przypadkach. Materiał i metody: Badaniem, przeprowadzonym w dwóch ośrodkach, objęto trzy przypadki bliźniąt nierozdzielonych, zdiagnozowane w okresie 6 lat – od 2010 do 2015 roku. W każdym przypadku rozpoznanie ustalono w prenatalnym badaniu ultrasonograficznym. W jednym przypadku w toku dalszej diagnostyki przeprowadzono badanie metodą rezonansu magnetycznego. Wyniki: Prezentowane trzy przypadki bliźniąt nierozdzielonych (cephalopagus, thoracopagus i omphalopagus) zostały prawidłowo zidentyfikowane w prenatalnym badaniu ultrasonograficznym. Po szczegółowym omówieniu rozpoznania z rodzicami oraz otrzymaniu pisemnej zgody wszystkie ciąże terminowano. Poród żywych bliźniąt był niepowikłany dla matek i we wszystkich przypadkach dzieci zmarły kilka minut po urodzeniu. Wnioski: Badanie ultrasonograficzne umożliwia wczesne i trafne rozpoznanie bliźniąt nierozdzielonych, co jest kluczowe w położnictwie. Rezonans magnetyczny stosuje się w celu bardziej szczegółowego scharakteryzowania tkanek. W przypadku decyzji o terminacji ciąży odpowiednie postępowanie należy wdrożyć jak najwcześniej, ze względu na problemy, jakie mogą się pojawić w późniejszych etapach ciąży. Nowe technologie, jak druk trójwymiarowy, mogą być pomocne w planowaniu zabiegów chirurgicznych i umożliwiają tym samym skuteczne rozdzielenie bliźniąt. Artykuł w wersji polskojęzycznej jest dostępny na stronie http://jultrason.pl/index.php/wydawnictwa/volume-17-no-71
    Źródło:
    Journal of Ultrasonography; 2017, 17, 71; 259-266
    2451-070X
    Pojawia się w:
    Journal of Ultrasonography
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-34 z 34

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