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    Tytuł:
    A novel flattened gain C-band cascaded hybrid optical Raman and thulium-doped fluoride fiber amplifier for super dense wavelength division multiplexing system
    Autorzy:
    Kumar, C.
    Goyal, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/174394.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    gain
    noise figure
    Raman amplifier
    thulium-doped fluoride fiber
    TDFF amplifier
    super dense wavelength division multiplexing
    SD-WDM
    hybrid optical amplifier
    Opis:
    In this paper, we have reported a very advanced hybrid optical amplifier (Raman-TDFF amplifier) for the 180 × 10 Gbps super dense wavelength division multiplexing system with the channel spacing of 100 GHz. The performances of the model have been evaluated in terms of gain and noise figures for the C-band (from 1525 to 1565 nm). Gain flatness (> 21 dB) is recorded with the least variation of 2.5 dB without using any cost effective technique. Further, the effect of the proposed hybrid optical amplifier has also been analyzed with slightly shifting the wavelength spectrum for the same feature.
    Źródło:
    Optica Applicata; 2018, 48, 2; 173-177
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance and stability analysis of series-cascaded, high-gain, interleaved boost converter for photovoltaic applications
    Autorzy:
    Prasanna Kumar, C.
    Venugopal, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193536.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    series cascade
    interleaved boost converter
    high gain
    stability
    fast Fourier transform
    Opis:
    Interleaved boost converters (IBCs) are cascaded in parallel in most of the applications. This novel approach connects IBC in series cascade. The IBC has an optimal operating duty cycle of 0.5. Normally, photovoltaic source voltage is low because of space constraints. In order to boost the source voltage, a conventional boost converter is replaced with series-cascaded IBC in this paper. The single-stage IBC also boosts the voltage to twice the input voltage. In the proposed converter, output voltage is about four times the input voltage with the same 0.5 duty cycle. A mathematical model is developed and simulated for the proposed work in MATLAB/Simulink platform. The output of the proposed circuit is analysed through fast Fourier transform to know the harmonic content due to the switching. The system is tested for stability with signal-flow graph modelling. The proposed work is realised using hardware and tested to validate the model.
    Źródło:
    Power Electronics and Drives; 2018, 3, 38; 85-97
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of energy-efficient IBC with IGBT module for photovoltaic applications
    Autorzy:
    Kumar, C. Prasanna
    Rao, Anand
    Powiązania:
    https://bibliotekanauki.pl/articles/1193903.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    interleaved boost converter
    efficiency
    stability
    power converter
    switching frequency
    Opis:
    The proposed study is improvised value-engineered modifications for the basic interleaved boost converter (IBC) by including relevant modifications in circuits, which is expected for a better performance in switching with reduction in losses. The newly modified IBC circuit with insulated gate bipolar transistor (IGBT) along with converter has been experimented by simulations and the results are tabulated to modified IBC with metal oxide silicon field effect transistors. Further experimental analysis and validations of the proposed simulation with hardware developed adopting model SKM195GB066D consisting of IGBTs is presented. This study further enhances and summarises the optimum utilisation and the performance of IBC with the proposed IGBT modules that synchronises power diode. Enhancing the simulation outcomes, the hardware is proposed and developed to be tested for a load up to 1.5 kW with the evaluation of key parameters such as efficiency of the converter.
    Źródło:
    Power Electronics and Drives; 2020, 5, 40; 73-81
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation on the Role of Nanoparticle on Microbial Nano Interface to Understand Pathogenecity
    Autorzy:
    Kumar, C. Naveen
    Radhakrishnan, B.
    Santhanam, Amutha
    Powiązania:
    https://bibliotekanauki.pl/articles/1031841.pdf
    Data publikacji:
    2020
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Antimicrobial
    Salmonella typhi
    Silver nanoparticles
    Opis:
    Nano-biotechnology represents the intersection of nanotechnology and biotechnology which is an emerging field in creation, productivity and utility of nanoscale structures for advanced biotechnology. Plant and plant extract are considered as green and effective paths in the synthesis of gold and silver nanoparticles. The aim of the present study is to analyze the interaction of silver nanoparticles synthesized from herbal source (Cinnamon zeylanicum) with pathogenic bacteria Salmonella typhi (S. typhi) in order to know the microbe pathogenicity. The micro-nano interface disturbed the growth of microbes. Under the influence of different concentration of nanoparticles (50 µL to 1,000 µL), the microbes exhibited slow growth as compared to control. The viable cell count also decreased as the nanoparticles concentration increased. This shows major difference in the bacterial culture of with and without nano particle. Under normal culture, without nanoparticles intervention, the microbes show lag phase at 0-4 h, the log phase begins and its exponential growth occurs between 4-8 h and after 12 h, stationary phase was attained. There was a slow growth observed when the culture was exposed to silver nanoparticles. This clearly shows the antimicrobial effect of nanoparticles. In this study we used green synthesized nanoparticles, which have shown a good antibacterial efficacy against the pathogenic microorganism Salmonella typhi.
    Źródło:
    World News of Natural Sciences; 2020, 30, 2; 89-95
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A comprehensive survey on formal concept analysis, its research trends and applications
    Autorzy:
    Singh, P. K.
    Aswani Kumar, C.
    Gani, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/330445.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    concept lattice
    formal concept analysis
    formal concept
    formal context
    Galois connection
    krata pojęć
    formalna analiza koncepcji
    koneksja Galois
    Opis:
    In recent years, FCA has received significant attention from research communities of various fields. Further, the theory of FCA is being extended into different frontiers and augmented with other knowledge representation frameworks. In this backdrop, this paper aims to provide an understanding of the necessary mathematical background for each extension of FCA like FCA with granular computing, a fuzzy setting, interval-valued, possibility theory, triadic, factor concepts and handling incomplete data. Subsequently, the paper illustrates emerging trends for each extension with applications. To this end, we summarize more than 350 recent (published after 2011) research papers indexed in Google Scholar, IEEE Xplore, ScienceDirect, Scopus, SpringerLink, and a few authoritative fundamental papers.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2016, 26, 2; 495-516
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enhanced clock gating technique for power optimization in SRAM and sequential circuit
    Autorzy:
    Ashok Kumar, C.
    Madhavi, B.K.
    Lal Kishore, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2141882.pdf
    Data publikacji:
    2021
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    enhanced clock gating
    D-Latch gating
    SRAM
    sequential circuit
    Area
    Delay
    Opis:
    Low power VLSI designs are having wide variety of application usage in real-time. VLSI circuits are analyzed with various power reduction strategies. Existing approaches are used the clock frequency control, switching activity and scaling factor for power reduction. The glitching problem and clock triggering issues are higher therefore; the proposed work utilized the improved circuit of clock gating technique. In this proposed work, the enhanced clock gating with D-latch model is constructed to obtain the less power consumption. The traditional clock gating technique is improved by adding clock triggering on LATCH circuit and adding buffer circuit between the source and load circuitry to reduce the clock switching issues like gitching and clocking activity. Here the SRAM and sequential counter circuits are designed to utilize the power reduction strategy for improving the performance. This is applicable for various applications in real world and utilizing the FPGA and DSP application specific circuits. Experimental results are analyzed to obtain the power reduction result of SRAM and sequential circuit. Area, power, and delay are obtained the better results as compared with the previous work. Overall, design is performed using Xilinx 14.2 ISE suit.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2021, 15, 2; 32-38
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of Jigging Process Parameters to Beneficiate Iron Ore Fines – a Case Study of Tatasteel
    Optymalizacja parametrów procesu wzbogacania w osadzarce drobnouziarnionej rudy żelaza – studium przypadku Tatasteel
    Autorzy:
    Shukla, Vishal
    Kumar, C. Raghu
    Chakraborty, D. P.
    Kumar, Ashok
    Powiązania:
    https://bibliotekanauki.pl/articles/318528.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    osadzarka
    granulometria
    jakość nadawy
    wysokość łoża osadzarki
    wydajność
    wydajność separacji
    wzbogacanie żelaza
    jigging
    granulometry
    feed quality
    bed height
    yield
    separation efficiency
    iron separation
    Opis:
    Jigging has a very important role in mineral processing Industry. Upgrading of Iron Ore by jigging has been an emerging trend. A detailed investigation is carried out to understand the role of jig feed distribution and process parameters during jigging operation. Noamundi jig plant data shows that variation in jig feed granulometry, feed quality and operating conditions are major contributors to fluctuation in jigging performance. At Noamundi the Jig feed size (-10.0+0.5mm) fraction is used for fines jigging operation. To understand the effect of particle size distribution on jig plant performance such as yield, separation efficiency and Fe recovery. In this context The performance of jigging was evaluated by daily average data from jig operation was used to study the influence of feed distribution on jigging performance .Coarser fraction (+6mm) has a positive influence, whereas fines fraction (-0.5mm) tends to lower performance .During Jigging rearrangements of Particles takes place due to an alternate expansion and compaction of Jig Bed .These particles are arranged by increasing density from top to bottom. During the particle stratification, Jig bed physically cut at desired horizontal particle density plant to separate the desired product. Investigation shows that optimum bed height is required at different Jig feed quality to achieve desired product quality, maximum separation efficiency and Fe recovery. This Paper will illustrate role of feed distribution and process parameters control on Jigging plant performance and deals with optimization of process parameters to recover iron value from fines.
    Wzbogacanie w osadzarce odgrywa bardzo ważną rolę w przemyśle przetwórstwa minerałów. Wzbogacanie rudy żelaza w osadzarkach jest nowym kierunkiem badań nad wzbogacalnością. Przeprowadzono szczegółowe badania w celu określenia wpływu uziarnienia nadawy i parametrów procesu na efektywność procesu. Dane dotyczące wzbogacania w zakładzie Noamundi pokazują, że zróżnicowanie składu ziarnowego nadawy i warunki procesu są głównymi czynnikami wpływającymi na wahania wydajności osadzarki. W Zakładzie Noamundi do wzbogacania w osadzarce kierowana jest klasa ziarnowa (10,0–0,5 mm). Zbadano wpływ rozkładu wielkości cząstek na wydajność osadzarki, taką jak wydajność, skuteczność rozdziału i odzysk żelaza. Wydajność osadzarki oceniono na podstawie średnich dziennych danych z osadzarki przemysłowej, które wykorzystano do zbadania wpływu parametrów nadawy na wydajność. Udział grubszych ziaren (+6 mm) ma pozytywny wpływ, podczas gdy drobnych ziaren (-0,5 mm) ma tendencję do obniżania wydajności. W procesie osadzania następują zmiany gęstości łoża. Zmiana gęstości łoża następuje od góry (najniższa) do dołu (największa). Podczas stratyfikacji ziaren warstwa materiału jest rozdzielana na określonym poziomie, tak aby uzyskać produkt o pożądanej charakterystyce. Badanie wykazało, że optymalna wysokość łoża osadzarki jest różna dla różnej charakterystyki nadawy tak aby osiągnąć pożądaną jakość produktu, maksymalną wydajność separacji i odzysk Fe. W niniejszym artykule zilustrowano rolę jakości nadawy i kontroli parametrów procesu dla uzyskania wydajności osadzarki, oraz przedstawiono optymalizację parametrów procesu w celu maksymalizacji uzysku żelaza.
    Źródło:
    Inżynieria Mineralna; 2019, 21, 1/2; 165-170
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Treatment of Municipal Wastewater Using Electrocoagulation Process
    Autorzy:
    Abshishek, H.
    Vijayakumar, H.
    Mahesh Kumar, C L
    Shwetha, Kotagi Girisha
    Powiązania:
    https://bibliotekanauki.pl/articles/27314889.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    electrocoagulation
    municipal sewage
    central composite design
    CCD
    response surface methodology
    total suspended solids
    TSS
    elektrokoagulacja
    ścieki komunalne
    kompozyty
    metodologia powierzchni odpowiedzi
    RSM
    zawiesiny
    Opis:
    Treatment of Municipal wastewater by Electrocoagulation (EC) process using punched aluminium and zinc electrodes was studied in a batch EC cell reactor. Response surface methodology (RSM) based on Central Composite Design (CCD) was utilized to optimize the operating parameters for the removal of % Total Suspended Solids (TSS) and % Chemical Oxygen Demand (COD) from Municipal Sewage. Effect of operating parameters such as Electrode Distance (x1), Electrolysis Time (x2) and Voltage (x3) has been optimized for the removal of TSS and COD. The prediction of removal percentage of TSS and COD in various Operational circumstances is done by using Quadratic model. The significance of each operating parameter was computed by Analysis of variance (ANOVA). To achieve the maximum removal of % TSS and % COD, the optimum conditions were Electrode distance(x1)-3 cm, Electrolysis Time (x2)-70.299 minute and Voltage (x3)-6.5V. It was observed that the performance of electrocoagulation process increased up to 61.45% for COD removal, and 73.73% for TSS removal using punched electrode compared to plane electrodes.
    Źródło:
    Civil and Environmental Engineering Reports; 2023, 33, 4; 1--13
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Status and Scope of the Jute Industry in India in Comparison to other World Producers
    Analiza produkcji włókien z juty i wyrobów jutowych w Indiach w porównaniu do innych producentów światowych
    Autorzy:
    Bag, S. N.
    Kumar, U. C.
    Pal, A. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/234020.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    twill
    bags
    hessian
    jute goods
    sacking
    diagonal
    torby
    włókno jutowe
    wyroby z juty
    worki jutowe
    Opis:
    India is the leading producer of raw jute and jute products in the world. India’s sacking goods production comprises 75% of the total goods production and B twill bags, used for packaging rice and wheat, and contributes 85% of the total sacking bag production. Still there exists an increasing trend of imports of jute products due to the increase in the domestic consumption of conventional jute goods. Bangladesh is the major exporter in jute goods, with India in 2nd position. Hessian cloth and bags are the major exporting items of jute goods from India. In the overall situation, there exists a unique opportunity of the jute industry to improve the social and economic conditions of the states concerned as well as the country. Being the preferred sector in raw jute production due to suitable topographical conditions, emphasis now needs to be placed on modernization of the jute sector with a view to developing a viable and efficient jute manufacturing sector in the country.
    Indie są wiodącym producentem włókien jutowych i produktów z juty. Indie produkują 75%-85% światowej produkcji worków opakunkowych. Istnieje wzrastający trend zużycia worków jutowych w związku ze zwiększającym się zapotrzebowaniem krajowym. Drugie miejsce w produkcji wyrobów jutowych zajmuje Bangladesz. Istnieją korzystne warunki do dalszej poprawy rozwoju przemysłu juty, w tym zwiększenie modernizacji i wydajności przemysłu.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2016, 6 (120); 19-25
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal Decomposition and Kinetics Studies of AN, KDN and Their Mixtures with and without Catalysts
    Autorzy:
    Kumar, P.
    Joshi, P. C.
    Kumar, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/358729.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    green oxidizers
    phase stabilization
    thermal decomposition
    thermo-kinetics
    catalysts
    Opis:
    Potassium dinitramide (KDN) was incorporated in ammonium nitrate (AN) crystals in AN/KDN ratio of 90/10, 75/25 and 50/50 by a co-crystallization method. These mixtures were subjected to thermal decompositional studies (DSC-TG) using a Simultaneous Thermal Analyzer (STA). The catalysts used for the present studies were: i) cupric(II) oxide (CuO) and, ii) copper-cobalt based metal oxide (Cu-Co*). For all catalytic samples, 2% by weight percent of catalyst was added to the total weight of the samples. Thermal decomposition studies were carried out for all the oxidizer samples prepared. Thermal decompositional studies were carried out at three different heating rates, i.e. 3 K/min, 5 K/min and 10 K/min, and the kinetic parameters were computed using the model free Flynn-Wall-Ozawa equation. It has been observed that 50% KDN addition resulted in complete suppression of endothermicity indicating total supression of the phase changes of AN in this temperature range. Further, it was noticed that CuO acts as a better phase stabilizer for AN as compared to Cu-Co*. However, Cu-Co* considerably increased the net exothermic decompositional heat release (J/g) of AN.
    Źródło:
    Central European Journal of Energetic Materials; 2017, 14, 1; 184-200
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of SiO2 flux on the depth of penetration, microstructure, texture and mechanical behavior of AA6063 T6 aluminum alloy using activated TIG welding
    Autorzy:
    Kumar, Rajiv
    Vettivel, S. C.
    Kumar Kansal, Harmesh
    Powiązania:
    https://bibliotekanauki.pl/articles/2090702.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminum alloy
    depth of penetration
    tensile strength texture
    stop aluminium
    głębokość penetracji
    wytrzymałość na rozciąganie
    Opis:
    Activated tungsten inert gas (ATIG) welding has a good depth of penetration (DOP) as compared to the conventional tungsten inert gas (TIG) welding. This paper is mainly focused on ATIG characterization and mechanical behavior of aluminum alloy (AA) 6063-T6 using SiO2 flux. The characterization of the base material (BM), fusion zone (FZ), heat affected zone (HAZ) and, partially melted zone is carried out using the suitable characterization methods. The weld quality is characterized using ultrasonic-assisted non-destructive evaluation. A-scan result confirms that the ATIG welded samples have more DOP and less bead width as compared to conventional TIG. The recorded tensile strength of ATIG with SiO2 is better than the conventional TIG welding. The failure mode is ductile for ATIG welding with larger fracture edges and is brittle in the case of conventional TIG welding.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 1; e136215, 1--8
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of SiO2 flux on the depth of penetration, microstructure, texture and mechanical behavior of AA6063 T6 aluminum alloy using activated TIG welding
    Autorzy:
    Kumar, Rajiv
    Vettivel, S. C.
    Kumar Kansal, Harmesh
    Powiązania:
    https://bibliotekanauki.pl/articles/2173585.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminum alloy
    depth of penetration
    tensile strength texture
    stop aluminium
    głębokość penetracji
    wytrzymałość na rozciąganie
    Opis:
    Activated tungsten inert gas (ATIG) welding has a good depth of penetration (DOP) as compared to the conventional tungsten inert gas (TIG) welding. This paper is mainly focused on ATIG characterization and mechanical behavior of aluminum alloy (AA) 6063-T6 using SiO2 flux. The characterization of the base material (BM), fusion zone (FZ), heat affected zone (HAZ) and, partially melted zone is carried out using the suitable characterization methods. The weld quality is characterized using ultrasonic-assisted non-destructive evaluation. A-scan result confirms that the ATIG welded samples have more DOP and less bead width as compared to conventional TIG. The recorded tensile strength of ATIG with SiO2 is better than the conventional TIG welding. The failure mode is ductile for ATIG welding with larger fracture edges and is brittle in the case of conventional TIG welding.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 1; art. no. e136215
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies on carcinogenic PAHs emission generated by vehicles and its correlation to fuel and engine types
    Autorzy:
    Kumar, V.
    Kothiyal, N. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/949327.pdf
    Data publikacji:
    2014
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    polycyclic aromatic hydrocarbons
    gas chromatography
    pollutants
    concentration
    season
    Opis:
    The objective of this study was to find major PAHs produced in ambient air from the automobile exhaust as a function of fuels (diesel, petrol, and biodiesel) and engine type qualitatively and quantitatively. The recovery range was found between 30% and 70%. The study was carried out on two, three, and four wheelers. Biodiesel samples tested in the study were synthesized indigenously from different starting raw materials and analyzed for PAHs concentration in the exhaust on a Honda genset (EBK 2000AC Model). Biodiesel samples were blended with diesel in different ratio (25:75, 35:65 and 45:55) to investigate the exhaust behavior. Biodiesel was blended with Diesel the concentration of almost all PAHs reduces in comparison to pure Diesel exhaust. B(a)A and B(a) P was the common PAH found in higher concentration in almost all fuels. FTIR results indicate esterification of vegetable oil and NMR results indicate a complete conversion of oils into biodiesel.
    Źródło:
    Polish Journal of Chemical Technology; 2014, 16, 1; 48-58
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fertility improvement in pea [Pisum sativum L.] autotetraploids - mutation breeding
    Autorzy:
    Kumar, H
    Mercykuty, V.C.
    Srivastava, C.P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2048128.pdf
    Data publikacji:
    1995
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mutation breeding
    micromutation
    fertility improvement
    autotetraploid
    disjunction index
    pea
    Pisum sativum
    seed
    Opis:
    C₂ seeds of autotetraploids (colchicine-induced) of two diverse genotypes, T 163 and 5064-S, of pea (Pisum sativum L.) and their corresponding diploids were irradiated with 10 kR gamma-ray. Autotetraploids showed a high seed-sterility as compared to diploids. Seed fertility increased in M₂ as compared to M₁. Both quadrivalent and bivalent frequencies decreased in the M₁ generation of autotetraploids in relation to their respective controls. However, a positive shift in the mean bivalent formation was noted at the cost of other configurations in C₃-M₂ with respect to C₂-M₁ and varied with the genotype. In the M₂ generation of autotetraploids, the variability was relatively higher for the number of pods per plant and seed yield per plant. Although the mean values for pods per plant, number of seeds per pod and seed yield per plant remained more or less parallel in autotetraploids in M₁ and M₂ generations, there was an increase in the upper range limit probably due to micromutation for these characters in M₂.
    Źródło:
    Journal of Applied Genetics; 1995, 36, 1; 43-48
    1234-1983
    Pojawia się w:
    Journal of Applied Genetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Absorption Spectrum of Ni(II) Ions Doped in Lithium Sodium Potassium Sulphate Single Crystal
    Autorzy:
    Rama Kumar, R.
    Venkata Reddy, B. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933457.pdf
    Data publikacji:
    1995-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.40.-q
    78.50.-w
    Opis:
    The optical absorption spectra of lithium sodium potassium sulphate doped Ni$\text{}^{2+}$ ions at 300 and 77 K was recorded. The observed bands are assigned as transitions from the ground state $\text{}^{3}$A$\text{}_{2g}$(F) to various excited triplet and singlet states of the Ni$\text{}^{2+}$ ion in octahedral symmetry. The splittings observed for the bands $\text{}^{3}$T$\text{}_{1g}$(F) and $\text{}^{3}$T$\text{}_{2g}$(F) at liquid nitrogen temperature have been explained as due to spin-orbit interaction. The oscillator strengths of the transitions were computed from the area under the curves. From a detailed analysis of the bands of the spectrum, the crystal field parameters B, C, Dq and ξ are evaluated.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 6; 1023-1029
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Variable gravity effects on thermal instability of nanofluid in anisotropic porous medium
    Autorzy:
    Chand, R.
    Rana, G. C.
    Kumar, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/265426.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    porowatość
    liczba Rayleigha
    zmienna grawitacja
    nanofluid
    anisotropic porous medium
    Rayleigh number
    variable gravity
    Opis:
    In this paper, we study the effects of variable gravity on thermal instability in a horizontal layer of a nanofluid in an anisotropic porous medium. Darcy model been used for the porous medium. Also, it incorporates the effect of Brownian motion along with thermophoresis. The normal mode technique is used to find the confinement between two free boundaries. The expression of the Rayleigh number has been derived, and the effects of variable gravity and anisotropic parameters on the Rayleigh number have been presented graphically.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2013, 18, 3; 631-642
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Spin-Valve Transistor - a New Magnetoelectronic Device
    Autorzy:
    Anil Kumar, P. S.
    Lodder, J. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/2011222.pdf
    Data publikacji:
    2000-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.-i
    75.70.Pa
    Opis:
    A spin-valve transistor showing high sensitivity at low fields was developed. A large magnetocurrent, above 500% is realized by a magnetic field change of 2 to 4 Oe at 80 K. Hot electrons are injected into the spin-valve layer through a Si-Pt Schottky diode. These hot electrons, while traversing through the spin-valve, are spin-dependently scattered. Those electrons with right energy and momentum are collected by a collector (an Au-Si Schottky diode) constituting a collector current. The relative orientation of the magnetic layer in the spin-valve is changed by the application of a magnetic field and causes a change in collector current giving a large magnetocurrent.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 1; 111-118
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Low-Power High-Speed Double Gate 1-bit Full Adder Cell
    Autorzy:
    Kumar, R.
    Roy, S.
    Bhunia, C. T.
    Powiązania:
    https://bibliotekanauki.pl/articles/226653.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    low-power full-adder
    low-power CMOS design
    multiplexer based full-adder design
    multi-threshold voltage based full-adder design
    pass transmission logic
    Opis:
    In this paper, we proposed an efficient full adder circuit using 16 transistors. The proposed high-speed adder circuit is able to operate at very low voltage and maintain the proper output voltage swing and also balance the power consumption and speed. Proposed design is based on CMOS mixed threshold voltage logic (MTVL) and implemented in 180nm CMOS technology. In the proposed technique the most time-consuming and power consuming XOR gates and multiplexer are designed using MTVL scheme. The maximum average power consumed by the proposed circuit is 6.94μW at 1.8V supply voltage and frequency of 500 MHz, which is less than other conventional methods. Power, delay, and area are optimized by using pass transistor logic and verified using the SPICE simulation tool at desired broad frequency range. It is also observed that the proposed design may be successfully utilized in many cases, especially whenever the lowest power consumption and delay are aimed.
    Źródło:
    International Journal of Electronics and Telecommunications; 2016, 62, 4; 329-334
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal convection of magneto compressible couple-stress fluid saturated in a porous medium with Hall current
    Autorzy:
    Mehta, C. B.
    Singh, M.
    Kumar, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/265186.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    pole magnetyczne
    ściśliwość
    porowatość
    prądy Hall'a
    couple stress fluids
    horizontal magnetic field
    compressibility
    porous medium
    Hall currents
    Opis:
    An investigation is made on the effect of Hall currents on thermal instability of a compressible couple-stress fluid in the presence of a horizontal magnetic field saturated in a porous medium. The analysis is carried out within the framework of the linear stability theory and normal mode technique. A dispersion relation governing the effects of viscoelasticity, Hall currents, compressibility, magnetic field and porous medium is derived. For the stationary convection a couple-stress fluid behaves like an ordinary Newtonian fluid due to the vanishing of the viscoelastic parameter. Compressibility, the magnetic filed and couple-stress parameter have stabilizing effects on the system whereas Hall currents and medium permeability have a destabilizing effect on the system, but in the absence of Hall current couple-stress has a destabilizing effect on the system. It has been observed that oscillatory modes are introduced due to the presence of viscoelasticity, magnetic field porous medium and Hall currents which were non-existent in their absence.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2016, 21, 1; 83-93
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A comprehensive review of renewable energy production from biomass-derived bio-oil
    Autorzy:
    Sharma, M.
    Singh, J.
    Baskar, C.
    Kumar, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/80718.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    renewable energy
    biomass
    bio-oil
    bioenergy
    biomass source
    fast pyrolysis
    hydrothermal liquefaction
    climate change
    energy security
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2019, 100, 2
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molecular Interactions in Binary Organic Liquid Mixtures Containing Ethyl Oleate and Ethanol at 2MHz Frequency
    Autorzy:
    Manukonda, S.
    Kumar, G. P.
    Babu, C. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/412193.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Ethyl Oleate
    Ethanol
    molecular interactions
    adiabatic compressibility
    Opis:
    Molecular interactions of binary mixtures of Ethanol with a new organic compound Ethyl Oleate are investigated at a constant ultrasonic frequency of 2MHz under the temperature range of 303.15K-318.15K. The effect of mole fraction of Ethyl Oleate on velocity of sound wave and the density and viscosity of binary mixtures at various temperatures were studied. The effects on density (ρ), viscosity (η), adiabatic compressibility (βad), inter molecular free length (Lf) and internal pressure (Пi) also was studied.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2015, 40; 17-23
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Navigation of humanoids by a hybridized regression-adaptive particle swarm optimization approach
    Autorzy:
    Kumar, P. B.
    Sahu, C.
    Parhi, D. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/229923.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    navigation
    humanoid NAO
    RA
    APSO
    Petri-Net
    V-REP
    Opis:
    In the era of humanoid robotics, navigation and path planning of humanoids in complex environments have always remained as one of the most promising area of research. In this paper, a novel hybridized navigational controller is proposed using the logic of both classical technique and computational intelligence for path planning of humanoids. The proposed navigational controller is a hybridization of regression analysis with adaptive particle swarm optimization. The inputs given to the regression controller are in the forms of obstacle distances, and the output of the regression controller is interim turning angle. The output interim turning angle is again fed to the adaptive particle swarm optimization controller along with other inputs. The output of the adaptive particle swarm optimization controller termed as final turning angle acts as the directing factor for smooth navigation of humanoids in a complex environment. The proposed navigational controller is tested for single as well as multiple humanoids in both simulation and experimental environments. The results obtained from both the environments are compared against each other, and a good agreement between them is observed. Finally, the proposed hybridization technique is also tested against other existing navigational approaches for validation of better efficiency.
    Źródło:
    Archives of Control Sciences; 2018, 28, 3; 349--378
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of the Influence of Stretch on the Air Permeability of Knitted Fabric: Effect of Loop Length
    Badanie wpływu rozciągnięcia dzianin na przepuszczalność powietrza. Wpływ długości pętli
    Autorzy:
    Kumar, V.
    Prakash, C.
    Manigandan, G.
    Sampath, V. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419911.pdf
    Data publikacji:
    2021
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    air permeability
    comfort
    knitted fabrics
    loop length
    relaxation
    stretch
    przepuszczalność powietrza
    wygoda
    dzianiny
    długość pętli
    rozciągliwość
    Opis:
    Most of the time, a certain degree of stretch prominently and incrementally occurs in intimate wear, leisure wear, sportswear, medical textiles etc., during their action. Variations in the stretch gradient would definitely cause changes in the air permeability of knitted fabrics. The influence of variables such as loop length, the presence of an elastomeric component and fabric structure on the air permeability of cotton single jersey and pique knitted fabrics in a stretched state was critically analysed. In this work, changes in the air permeability of cotton jersey samples with and without elastomer were investigated and reported by keeping the samples in static up to an incremental stretch of 40% at a rate of 10% of the stretch gradient, in a dry relaxed state, wet relaxed state and fully relaxed state.
    W większości przypadków, podczas użytkowania odzieży rekreacyjnej, sportowej, medycznej itp. występuje pewien stopień rozciągnięcia. Wahania gradientu rozciągliwości powodują zmiany przepuszczalności powietrza dzianin. W pracy przeanalizowano wpływ zmiennych, takich jak: długość pętli, obecność składnika elastomerowego i rodzaju struktury na przepuszczalność powietrza dzianin bawełnianych typu single jersey i typu pique w stanie rozciągniętym. W pracy zbadano i odnotowano zmiany przepuszczalności powietrza w przypadku próbek dżerseju bawełnianego z elastomerem i bez elastomeru, utrzymując próbki w stanie statycznym do przyrostowego rozciągnięcia 40% z 10% gradientem rozciągania w stanie mokrym i suchym.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2021, 1 (145); 53-56
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Unsteady MHD thermal diffusive and radiative fluid flow past a vertical porous plate with chemical reaction in slip flow regime
    Autorzy:
    Ravi Kumar, D.
    Jayarami Reddy, K.
    Raju, M. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/265452.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    swobodna konwekcja
    magnetohydrodynamika
    przenoszenie ciepła
    dyfuzja termiczna
    promieniowanie
    reakcja chemiczna
    poślizg
    MHD
    free convection
    heat and mass transfer
    slip flow regime
    thermal diffusion
    radiation
    chemical reaction
    Opis:
    An analytical solution of an MHD free convective thermal diffusive flow of a viscous, incompressible, electrically conducting and heat-absorbing fluid past a infinite vertical permeable porous plate in the presence of radiation and chemical reaction is presented. The flow is considered under the influence of a magnetic field applied normal to the flow. The plate is assumed to move with a constant velocity in the direction of fluid flow in slip flow regime, while free stream velocity is assumed to follow the exponentially increasing small perturbation law. The velocity, temperature, concentration, skin friction, Nusselt number and Sherwood number distributions are derived and have shown through graphs and tables by using the simple perturbation technique.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2019, 24, 1; 117-129
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental investigation and characteristics of multiwalled carbon nanotube aqua nanofluids from a flat plate heater surface in a pool
    Autorzy:
    Vasudevan, D.
    Senthil Kumar, D.
    Murugesan, A.
    Vijayakumar, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/201185.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nanofluids
    critical heat flux
    heat transfer coefficient
    boiling
    heat transfer enhancement
    Opis:
    In this experimental investigation, the critical heat flux (CHF) of aqua-based multiwalled carbon nanotube (MWCNT) nanofluids at three different volumetric concentrations 0.2%, 0.6%, and 0.8% were prepared, and the test results were compared with deionized water. Different characterization techniques, including X-ray diffraction, scanning electron microscopy and Fourier transform infrared, were used to estimate the size, surface morphology, agglomeration size and chemical nature of MWCNT. The thermal conductivity and viscosity of the MWCNT at three different volumetric concentrations was measured at a different temperature, and results were compared with deionized water. Although, MWCNT-deionized water nanofluid showed superior performance in heat transfer coefficient as compared to the base fluid. However, the results proved that the critical heat flux is increased with an increase in concentrations of nanofluids.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 3; 547-554
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of tribology parameters of AZ91D magnesium alloy in dry sliding condition using response surface methodology and genetic algorithm
    Autorzy:
    Beniyel, M.
    Sivapragash, M.
    Vettivel, S. C.
    Senthil Kumar, P.
    Ajith Kumar, K. K.
    Niranjan, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2173540.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    magnesium alloy
    pin-on-disc
    tribology
    dry condition
    optimization
    casting
    stop magnezu
    trybologia
    stan suchy
    optymalizacja
    odlew
    Opis:
    In the present research, the wear behaviour of magnesium alloy (MA) AZ91D is studied and optimized. MA AZ91D is casted using a die-casting method. The tribology experiments are tested using pin-on-disc tribometer. The input parameters are sliding velocity (1‒3 m/s), load (1‒5 kg), and distance (0.5‒1.5 km). The worn surfaces are characterized by a scanning electron microscope (SEM) with energy dispersive spectroscopy (EDS). The response surface method (RSM) is used for modelling and optimising wear parameters. This quadratic equation and RSM-optimized parameters are used in genetic algorithm (GA). The GA is used to search for the optimum values which give the minimum wear rate and lower coefficient of friction. The developed equations are compared with the experimental values to determine the accuracy of the prediction.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 1; art. no. e135835
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of tribology parameters of AZ91D magnesium alloy in dry sliding condition using response surface methodology and genetic algorithm
    Autorzy:
    Beniyel, M.
    Sivapragash, M.
    Vettivel, S. C.
    Senthil Kumar, P.
    Ajith Kumar, K. K.
    Niranjan, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2090729.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    magnesium alloy
    pin-on-disc
    tribology
    dry condition
    optimization
    casting
    stop magnezu
    trybologia
    stan suchy
    optymalizacja
    odlew
    Opis:
    In the present research, the wear behaviour of magnesium alloy (MA) AZ91D is studied and optimized. MA AZ91D is casted using a die-casting method. The tribology experiments are tested using pin-on-disc tribometer. The input parameters are sliding velocity (1‒3 m/s), load (1‒5 kg), and distance (0.5‒1.5 km). The worn surfaces are characterized by a scanning electron microscope (SEM) with energy dispersive spectroscopy (EDS). The response surface method (RSM) is used for modelling and optimising wear parameters. This quadratic equation and RSM-optimized parameters are used in genetic algorithm (GA). The GA is used to search for the optimum values which give the minimum wear rate and lower coefficient of friction. The developed equations are compared with the experimental values to determine the accuracy of the prediction.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 1; e135835, 1--10
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Shot peening effects on fatigue life, corrosion behavior and surface roughness of low carbon alloy steel
    Autorzy:
    Selva Senthil Prabhu, C.
    Ashoka Varthanan, P.
    Ram Kumar, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2086823.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    surface roughness
    shot peening
    fatigue life
    chropowatość powierzchni
    śrutowanie
    trwałość zmęczeniowa
    Opis:
    In this present study, the effect of the shot peening process on fatigue life, surface hardness and corrosion properties of a low carbon alloy steel is examined at room temperature. The research article addresses the effect of shot peening by varying the process parameters such as peening distance and pressure with amachrome as shots. The experiment is designed by means of full factorial design. The experimental result reveals that the pressure and distance are the most significant factors in the shot peening process. The results illustrate that the average pressure of 7 bar and distance of 100 mm improves fatigue life by 1.5% of unpeened material under 20 Hz frequency while corrosion resistance improves by 4% with unpeening of the low carbon alloy steel by using amachrome as a shot.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 1; art. no. e136214, 1--7
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Finite element studies on free vibration of laminated composite cylindrical skew panels
    Autorzy:
    Srinivasa, C. V.
    Suresh, Y. J.
    Prema Kumar, W. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/955177.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    panel cylindryczny
    laminat
    wolne wibracje
    element skończony
    częstotliwość podstawowa
    cylindrical skew panel
    panel angle
    skew angle
    antisymmetric laminates
    free vibration
    finite element
    fundamental frequency
    Opis:
    This paper presents the finite element studies on free vibration of isotropic and laminated composite cylindrical skew panels. The analysis is performed using CQUAD4 and CQUAD8 elements of MSC/NASTRAN. The effects of the panel angle, skew angle, aspect ratio and length-to-thickness-ratio on fundamental frequency of isotropic cylindrical skew panels are studied. The effects of additional parameters such as the fiber orientation angle, numbers of layers and stacking sequence on the fundamental frequency of antisymmetric composite laminates are also studied. It is found that the CQUAD8 element yields better results than the CQUAD4 element in the validation and convergence studies. The CQUAD8 element is employed for the remaining part of the studies. The fundamental frequencies are found to increase with the panel angle and skew angle. When the number of layers in the laminate is large, the variation of the fundamental frequency with the number of layers is not appreciable. The boundary conditions are found to have a significant influence on the fundamental frequency.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2014, 19, 1; 165-180
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Shot peening effects on fatigue life, corrosion behavior and surface roughness of low carbon alloy steel
    Autorzy:
    Selva Senthil Prabhu, C.
    Ashoka Varthanan, P.
    Ram Kumar, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2090715.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    surface roughness
    shot peening
    fatigue life
    chropowatość powierzchni
    śrutowanie
    życie zmęczeniowe
    Opis:
    In this present study, the effect of the shot peening process on fatigue life, surface hardness and corrosion properties of a low carbon alloy steel is examined at room temperature. The research article addresses the effect of shot peening by varying the process parameters such as peening distance and pressure with amachrome as shots. The experiment is designed by means of full factorial design. The experimental result reveals that the pressure and distance are the most significant factors in the shot peening process. The results illustrate that the average pressure of 7 bar and distance of 100 mm improves fatigue life by 1.5% of unpeened material under 20 Hz frequency while corrosion resistance improves by 4% with unpeening of the low carbon alloy steel by using amachrome as a shot.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 1; e136214, 1--7
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On Nigerian and Indian Toponyms: Socio-Cultural Divergence and Development
    Autorzy:
    Oha, Anthony C.
    Kumar, Bachchan
    Anyanwu, Bibian
    Omoera, Osakue S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1179271.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    English
    India
    Language development
    Nigeria
    Socio-cultural divergence
    Toponyms/Place-names
    Opis:
    In onomastic studies, toponyms are defined as place-names or names given to geographical locations which include towns, streets, and tourist centres. It is pertinent to note that India and Nigeria were both British colonies. Thus, English is placed as the official language of business and politics in both countries. However, Indians were quick to understand the power of language, due to the philosophical influence of Mahatma Gandhi, which enabled them to embrace Hindi language early, as a second official language. Deploying onomastics, semiotics, interpretative approach to translation, text analysis and cultural studies, we have selected one hundred (100) toponyms from different parts of India and Nigeria and analysed them in order to show the development of place-names in both countries in the new millennium. In Nigeria, the influence of British English is everywhere in the names of cities, towns, villages, streets, tourist centres, rivers, including ‘Douglas Road’, ‘Wetheral Road’, ‘Owerri’ instead of ‘Owere’, ‘Awka’ instead of ‘Oka’, ‘Warri instead of ‘Wori,’ among others. In India, however, we see indigenized naming forms such as ‘Tilak Nagar’, ‘Mahavir Nagar’, ‘Rama Krishna Ashram Marg’ and ‘Rajiv Chowk’. English language in India is fast dying, while in Nigeria, the reverse is the case. The conclusion reached is that while India is making serious efforts towards a complete linguistic independence, through the development of place-names, Nigeria is promoting anglicised place- names, which is detrimental to the development of indigenous Nigerian languages.
    Źródło:
    World Scientific News; 2017, 80; 268-283
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of weld fusion zone for TIG welded P91and P92 steels
    Autorzy:
    Pandey, C.
    Mahapatra, M. M.
    Kumar, P.
    Thakare, J. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/353653.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    P91
    P92
    fusion zone
    microstructure
    TIG
    Opis:
    The welding of nuclear grade P91 and P92 steel plate of thickness 5.2 mm were performed using the autogenous tungsten inert gas (TIG) welding process. The welded joint of P91 and P92 steel plate were subjected to the varying post weld heat-treatment (PWHT) including the post weld heat treatment (PWHT) and re-austenitizing based tempering (PWNT). A comparative study was performed related to the microstructure evolution in fusion zone (FZ) of both the welded joint using the scanning electron microscope and optical microscope in a different condition of heat treatment. The hardness test of the FZ for both joints was also conducted in a different condition of heat treatment. P92 steel welded joint have observed the higher tendency of the δ ferrite formation that led to the great variation in hardness of the P92 FZ. The homogeneous microstructure (absence of δ ferrite) and acceptable hardness was observed after the PWNT treatment for both the welded joint.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 4; 1755-1761
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental and finite element studies on free vibration of skew plates
    Autorzy:
    Srinivasa, C. V.
    Suresh, Y. J.
    Prema Kumar, W. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/955136.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    laminat
    analiza elementów skończonych
    płyta kompozytowa
    częstotliwość drgań
    skew plates
    antisymmetric laminates
    free vibration
    experimental method
    finite element analysis
    Opis:
    The present paper deals with the experimental studies carried out on free vibration of isotropic and laminated composite skew plates. The natural frequencies were also determined using QUAD8 finite element of MSC/NASTRAN and a comparison was made between the experimental values and the finite element solution. The effects of the skew angle and aspect ratio on the natural frequencies of isotropic skew plates were studied. The effects of the skew angle, aspect ratio, fiber orientation angle and laminate sequence (keeping the number of layers constant) on the natural frequencies of antisymmetric composite laminates were also studied. The experimental values of natural frequencies are in good agreement with the FE solutions. The natural frequencies are found to increase with an increase in the skew angle. The variation of natural frequencies with the aspect ratio is small and negligible both for isotropic and laminated composite skew plates.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2014, 19, 2; 365-377
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Moisture Management Properties of Bi-Layer Knitted Fabrics
    Właściwości zarządzania wilgocią w przypadku dzianin dwuwarstwowych
    Autorzy:
    Udaya Krithika, S. M.
    Sampath, M. B.
    Jebastin Rajwin, A.
    Prakash, C.
    Senthil Kumar, M.
    Senthil Kumar, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419740.pdf
    Data publikacji:
    2021
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    moisture management
    microdenier polyester
    comfort
    zarządzanie wilgocią
    poliester microdenier
    komfort
    Opis:
    For investigation of the moisture management properties of bi-layer knitted fabrics, a special knitting structure made of the same or different combinations of yarns of cotton, polypropylene, Microdenier polyester and polyester staple fibre on the face and reverse sides fibre was studied. Moisture management properties, which determine the warm-cool feeling, of the fabrics produced were determined and statistical analysis made. The results indicated that the Microdenier polyester (inner) – Microdenier polyester (outer) fabric had a better moisture management property, providing high levels of comfort, and is recommended for summer, active and sportswear. The results were discussed together with one-way ANOVA test results at a 0.05 significance level. The results indicate that the Microdenier poliester yarn inner and outer layer of bi-layer knitted fabric shows a better moisture management property due to its appreciable wetting radius, as well its good absorption rate, wetting time and spreading speed of sweat, thus exhibiting a very higher level of the comfort property.
    W celu określenia właściwości zarządzania wilgocią dzianin dwuwarstwowych zbadano specjalną strukturę dzianiny wykonaną z tej samej lub różnych kombinacji przędz bawełnianych, polipropylenowych, poliestrowych mikrodenier i poliestrowych włókien odcinkowych po stronie wierzchniej i spodniej. Określono właściwości odprowadzania wilgoci, które decydują o odczuciu ciepła-chłodu i przeprowadzono analizę statystyczną wyników. Wyniki wykazały, że dzianina poliestrowa Microdenier (wewnętrzna) – poliester Microdenier (zewnętrzna) ma lepsze właściwości odprowadzania wilgoci, zapewniając wysoki poziom komfortu i jest zalecana do stosowania w odzieży letniej, aktywnej i sportowej. Zaprezentowano wyniki jednokierunkowego testu ANOVA na poziomie istotności 0,05. Wyniki wskazały, że wewnętrzna i zewnętrzna warstwa przędzy poliestrowej Microdenier z dwuwarstwowej dzianiny wykazuje lepsze właściwości odprowadzania wilgoci ze względu na znaczny promień zwilżania, a także dobrą szybkość wchłaniania, czas zwilżania i prędkość rozprowadzania potu, a tym samym wykazuje wyższy poziom komfortu.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2021, 2 (146); 81-86
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Jamun Seed: A Review on Bioactive Constituents, Nutritional Value and Health Benefits
    Autorzy:
    Tak, Yamini
    Kaur, Manpreet
    Jain, Mool C.
    Samota, Mahesh Kumar
    Meena, Nirmal Kumar
    Kaur, Gurpreet
    Kumar, Rajendra
    Sharma, Daisy
    Lorenzo, José M.
    Amarowicz, Ryszard
    Powiązania:
    https://bibliotekanauki.pl/articles/2159284.pdf
    Data publikacji:
    2022-09-05
    Wydawca:
    Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
    Tematy:
    jamun seeds
    nutrients
    bioactives
    extraction and purification
    nutraceuticals
    Opis:
    Jamun fruit, a member of the Myrtaceae family, is commercially grown in tropical and subtropical areas of the world for its fruits with sweet, sour, and astringent luscious flesh. Seeds of jamun fruits are discarded as trash during the industrial processing of fruit pulp into beverages, jellies, jam, vinegar, wine, and squash. These seeds are a potential source of bioactive compounds including hydrolysable tannins, phenolic acids, flavonoids, other phenolics, terpenoids, phloroglucinol derivatives and saponins, which have been endorsed several biological activities, such as antidiabetic, anticancer, anti-inflammatory, antioxidant, antimicrobial, antihyperlipidemic and antihypercholesterolemic, as well as cardioprotective, hepatoprotective and neuroprotective properties. High contents of carbohydrates, dietary fiber, minerals, and ascorbic acid have also been found in jamun seeds. However, potential utilization of these seeds as innovative implements for health benefits has not yet been fully understood. We aim to compile scientific research and recent advances on jamun seed nutritional profile, bioactive compounds composition, bioactive properties, and their potential as an ingredient in functional food formulation.
    Źródło:
    Polish Journal of Food and Nutrition Sciences; 2022, 72, 3; 211-228
    1230-0322
    2083-6007
    Pojawia się w:
    Polish Journal of Food and Nutrition Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An optical study to estimate orientational order parameter on some benzylideneaminophenylbenzoate liquid crystals
    Autorzy:
    Subhan, C.
    Jeevan Kumar, R.
    Panduranga, P.
    Jayashreeand, B.
    Fakruddin, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1070607.pdf
    Data publikacji:
    2016-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.79.Kr
    78.15.+e
    61.30.Gd
    Opis:
    The birefringence technique has been used for the evaluation of order parameter in the nematic phase along with the density measurements, which are needed for the calculation of molecular polarizabilities of the compounds. Birefringence and density studies have been carried out on the three liquid crystalline compounds viz.(1) (E)-4-((4-hexyloxy)benzylidene)amino)phenyl 4-butoxybenzoate(2) (E)-4-((4-hexyloxy)benzylidene)amino)phenyl 4-(decycloxy)benzoate and(3) (E)-4-((4-hexyloxy)benzylidene)amino)phenyl 4-(tridecycloxy)benzoate.Using birefringence and density data the molecular polarizabilities are evaluated by two different internal field models due to Vuks and Neugebauer. The mean molecular polarizability of the compounds is also evaluated by employing modified Lippincott δ-function model. The results reveal that both the theoretical and experimental values obtained are very near to each other.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 3; 284-288
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The checklist of Impatiens Riv. ex L. (Balsaminaceae) in Nilgiri and Palani Hills of southern Western Ghats (India)
    Autorzy:
    Jeevith, S.
    Arigela, Ravi Kiran
    Rajeev Kumar Singh
    K Althaf Ahamed Kabeer
    C Rajasekar
    C Kunhikannan
    Powiązania:
    https://bibliotekanauki.pl/articles/2183573.pdf
    Data publikacji:
    2022-07-26
    Wydawca:
    Uniwersytet Komisji Edukacji Narodowej w Krakowie
    Tematy:
    Balsams
    Endemic
    Grasslands
    Shola forests
    Western Ghats
    niecierpki
    endemiczne
    lasy Shola
    łąki
    Ghaty Zachodnie
    Opis:
    A comprehensive checklist of the genus Impatiens Riv. ex L. (Balsaminaceae) in Nilgiri and Palani of southern Western Ghats, India is presented. After thorough field explorations in these areas from 2012 to 2020 in different seasons, 38 species of Impatiens are recorded, in which 6 species are endemic to Western Ghats and 26 species are endemic to southern Western Ghats of India. Horticultural potential of 18 endemic species of balsam is also discussed.
    W artykule zamieszczono obszerną listę gatunków z rodzaju Impatiens Riv. ex L. (Balsaminaceae), odnotowanych w Nilgiris i na Wzgórzach Palanis (południowa część Ghatów Zachodnich w Indiach). Po dokładnych badaniach terenowych, przeprowadzonych w różnych porach roku w latach 2012-2020, zarejestrowano na analizowanym obszarze 38 gatunków niecierpka, w tym 6 gatunków endemicznych dla całych Ghatów Zachodnich i 26 gatunków dla południowej części Ghatów Zachodnich. Krótko omówiono również potencjał ogrodniczy 18 endemicznych gatunków niecierpków.
    Źródło:
    Annales Universitatis Paedagogicae Cracoviensis Studia Naturae; 2022, 7; 9-22
    2543-8832
    2545-0999
    Pojawia się w:
    Annales Universitatis Paedagogicae Cracoviensis Studia Naturae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Salinity stress effects on the growth, morphological, physiological, and biochemical properties of Melia (Melia dubia Cav.) plant
    Autorzy:
    Kumar, R.
    Banyal, R.
    Singh, A.
    Yadav, R.K.
    Sharma, P.C.
    Powiązania:
    https://bibliotekanauki.pl/articles/2078273.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    Melia
    salt stress
    growth
    physiology
    phenology
    biochemical
    Opis:
    Salinity stress severely affects the growth, physiological and developmental processes in plant species. Melia dubia is an ecologically and economically important tree species of the Indian subcontinent. However, systematic information with respect to the species salt tolerance potential is completely lacking. Under salt stress conditions, determining suitable soil EC range is required for the better survival, growth and productivity of the tree species. In present study, we investigated the effects of different soil salinity (EC 4, 8, and 12) levels on the ion homeostasis, physio-biochemistry, morphology, and growth of M. dubia plant. Results revealed that increase in soil salinity causes higher Na+ content and Na+/K+ ratio, while lower K+ content, in the leaf tissues of M. dubia. The physiological processes such as the photosynthetic rate, stomatal conductance, internal CO2 concentration, and transpiration rate were adversely affected with the increased salt stress levels. Morphological parameters, such as internodal length, petiole length, leaf length, and leaf width also decreased (P<0.05) under saline stress conditions. Results further indicat- ed that salinity levels significantly (P<0.05) affected the M. dubia growth, and the growth rate was found optimum upto 8 EC, thereafter it slightly decreased with the increased salt stress to 12 EC. Our findings showed that increased salinity stress causes significant changes in the physiological, morphological, and growth pattern of M. dubia. Therefore, based on present experiment, we found M. dubia suitable for the salt affected soils of EC 8 with optimum growth rate and at EC 12 with the moderate (20–25%) growth reduction.
    Źródło:
    Dendrobiology; 2021, 86; 56-68
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Meiotic studies in some members of Caryophyllaceae Juss. from the Western Himalayas
    Autorzy:
    Jeelani, S.M.
    Rani, S.
    Kumar, S.
    Kumari, S.
    Gupta, R.C.
    Powiązania:
    https://bibliotekanauki.pl/articles/19318.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Caryophyllaceae
    Himalayas
    meiotic process
    chromosome number
    meiosis
    Western Himalayas
    pollen grain size
    Arenaria kashmirica
    Silene conoidea
    Silene edgeworthii
    Silene moorcroftiana
    Silene nepalensis
    Stellaria media
    Stellaria monosperma
    Stellaria semivestita
    Lychnis coronaria
    Silene vulgaris
    India
    Gypsophilla ceratioides
    Opis:
    The paper reports meiotic studies on 50 populations comprising 12 species belonging to 5 genera of Caryophyllaceae from the Western Himalayas. The chromosome numbers in Arenaria kashmirica (n=20), Silene conoidea (n=20), S. edgeworthii (n=12 and n=24), S. moorcroftiana (n=24), S. nepalensis (n=12), Stellaria media (n=13), S. monosperma (n=13) and S. semivestita (n=13) are reported for the first time. The chromosome numbers in Lychnis coronaria (n=12) and Silene vulgaris (n=24) are given for the first time from India, along with Gypsophilla ceratioides (n=15) from the Western Himalayas. The course of meiosis varies from normal to abnormal in different populations of Silene conoidea, S. edgeworthii, S. vulgaris, Stellaria media, S. monosperma and S. semivestita. The course of meiosis was abnormal in all studied populations of Lychnis coronaria. Abnormal microsporogenesis (cytomixis, chromosomal stickiness, unoriented bivalents, formation of laggards and bridges) led to reduced pollen fertility and differences in pollen grain size.
    Źródło:
    Acta Biologica Cracoviensia. Series Botanica; 2011, 53, 1
    0001-5296
    Pojawia się w:
    Acta Biologica Cracoviensia. Series Botanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal Comfort Properties of Bi-Layer Knitted Fabrics
    Właściwości termiczne dzianin dwuwarstwowych
    Autorzy:
    Udaya Krithika, S. M.
    Prakash, C.
    Sampath, M. B.
    Senthil Kumar, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/232802.pdf
    Data publikacji:
    2020
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    bi-layer knitted fabric
    polyester
    comfort
    thermal comfort
    dzianina dwuwarstwowa
    poliester
    komfort
    komfort termiczny
    Opis:
    Transmission of sensible and insensible perspiration is an important factor for fabric comfort. Improvement in the thermal comfort properties of knitted fabrics results in the achievement of fabric comfort. In this research, the thermal comfort properties of six bi-layer knitted fabrics were studied. The bi-layer knitted fabrics were made with different combinations of yarn in the inner layer and outer layer. The yarn combinations selected were polyester staple yarn-polyester staple yarn, polyester staple yarn-cotton, cotton-cotton, polypropylene-cotton, micro denier polyester-cotton, and micro denier polyester- micro denier polyester for the inner and outer layers, respectively. To find the thermal comfort properties of the six bi-layer knitted fabrics, an objective fabric test was carried out. The results showed that the bi-layer fabrics made from micro denier polyester, both in the inner and outer layers, exhibit better thermal comfort properties, thereby providing a higher level of comfort; hence, they are preferred for active sportswear. The water vapour permeability, air permeability, thermal resistance and thermal conductivity of the bi-layer knitted fabric made up of micro denier polyester as the outer and inner layer were found to be higher when compared to the other bi-layer structures. The results were discussed together with one – way ANOVA test results at a 0.05 significance level.
    Przenoszenie wyczuwalnego i niewyczuwalnego potu jest ważnym czynnikiem zapewniającym komfort użytkowania wyrobu. Poprawa właściwości komfortu termicznego dzianin skutkuje uzyskaniem komfortu użytkowania wyrobu. W pracy zbadano właściwości komfortu termicznego sześciu dwuwarstwowych dzianin. Dzianiny dwuwarstwowe zostały wykonane z różnych kombinacji przędzy w warstwie wewnętrznej i zewnętrznej. Wybrane kombinacje przędzy to: przędza cięta poliestrowo-poliestrowa, przędza odcinkowa poliestrowo-bawełniana, bawełniano-bawełniana, polipropylenowo-bawełniana, mikro denierowy poliester-bawełna i mikro denierowy poliester-poliester odpowiednio dla warstwy wewnętrznej i zewnętrznej. Aby określić właściwości komfortu termicznego sześciu dwuwarstwowych dzianin, przeprowadzono obiektywne testy wyrobów. Wyniki pokazały, że dwuwarstwowe dzianiny wykonane z poliestru mikro denierowego, zarówno w warstwie wewnętrznej, jak i zewnętrznej, wykazują lepsze właściwości komfortu termicznego, zapewniając w ten sposób wyższy poziom komfortu; dlatego są preferowane w produkcji aktywnej odzieży sportowej. Stwierdzono, że przepuszczalność pary wodnej, przepuszczalność powietrza, opór cieplny i przewodność cieplna dzianiny dwuwarstwowej wykonanej z poliestru mikro denierowego jako warstwy zewnętrznej i wewnętrznej są wyższe w porównaniu z innymi strukturami dwuwarstwowymi. Wyniki przeanalizowano za pomoca testu ANOVA na poziomie istotności 0,05.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2020, 5 (143); 50-55
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Utilization of Wallostonite/ Quasi Isotropic S2 Glass Fiber Doped in to Epoxy on Mechanical and Thermal Properties
    Autorzy:
    Reddy, D.M.
    Rakesh, C.H.
    Karthikeyan, N.
    Kumar, M. A.
    Nagaraju, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/412223.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Epoxy
    Wallostonite
    S2 glass fiber
    characterization
    DSC
    TGA
    Opis:
    Study focused on the performance of injection moulded short Wallostonite filler and chopped glass fiber reinforced hybrid epoxy composites. Results showed that hybridization of glass fiber and Wallostonite was found to be comparable to that of epoxy glass fiber composites. Analysis of fiber length distribution in the composite and fracture surface was performed to study fiber breakage fracture mechanism. The simultaneous compounding of epoxy with two fillers was done to obtain a hybrid composite. The mechanical properties of hybrid, injection molded, chopped glass fiber/ Wallostonite/epoxy composites have been investigated by considering the effect of hybridization by these two fillers. This system is expected to have considerable mechanical properties. It has been found that the tensile, flexural, and impact properties of the filled epoxy were higher than those of unfilled epoxy. The hybrid effects of the tensile strength and modulus were studied by the rule of hybrid mixtures (RoHM) using the values of single fiber composites.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2015, 40; 24-35
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of electric field on dispersion of a solute in an MHD flow through a vertical channel with and without chemical reaction
    Autorzy:
    Umavathi, J. C.
    Kumar, J. P.
    Gorla, R. S. R.
    Gireesha, B. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/265686.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    dyspersja Taylora
    magnetohydrodynamika
    reakcja chemiczna
    Taylor dispersion
    immiscible fluids
    conducting fluid
    MHD
    chemical reaction
    Opis:
    The longitudinal dispersion of a solute between two parallel plates filled with two immiscible electrically conducting fluids is analyzed using Taylor’s model. The fluids in both the regions are incompressible and the transport properties are assumed to be constant. The channel walls are assumed to be electrically insulating. Separate solutions are matched at the interface using suitable matching conditions. The flow is accompanied by an irreversible first-order chemical reaction. The effects of the viscosity ratio, pressure gradient and Hartman number on the effective Taylor dispersion coefficient and volumetric flow rate for an open and short circuit are drawn in the absence and in the presence of chemical reactions. As the Hartman number increases the effective Taylor diffusion coefficient decreases for both open and short circuits. When the magnetic field remains constant, the numerical results show that for homogeneous and heterogeneous reactions, the effective Taylor diffusion coefficient decreases with an increase in the reaction rate constant for both open and short circuits.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2016, 21, 3; 683-711
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of acoustical parameters in binary liquid mixture containing 1-butanol and hexane at temperatures 313.15 K, 318.15 K and 323.15 K
    Autorzy:
    Srinivasu, C. H.
    Kumar, A. K.
    Fakruddin, S. K.
    Narendra, K.
    Anjaneyulu, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/412551.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    density
    ultrasonic velocity
    viscosity
    1-butanol
    hexane
    adiabatic compressibility
    free length and molar volume
    Opis:
    The values of ultrasonic velocity (u), density (ρ), and viscosity (η) have been measured experimentally in the binary liquid mixture containing 1-butanol and hexane over the entire range of composition at different temperatures 313.15 K, 318.15 K and 323.15 K. This experimental data have been used to calculate the acoustical parameters such as adiabatic compressibility (β), free length (Lf), molar volume (Vm) and acoustic impedance(z). The results have been qualitatively used to explain the molecular interactions between the components of the liquid mixture.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 13; 1-7
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biosorption of aniline blue from aqueous solution using a novel biosorbent Zizyphus oenoplia seeds: Modeling studies
    Autorzy:
    Kumar, M.
    Elangovan, G
    Tamilarasan, R
    Vijayakumar, G.
    Mukeshkumar, P. C.
    Sendhilnathan, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/778750.pdf
    Data publikacji:
    2015
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    aniline blue
    removal
    biosorption
    Zizyphus oenoplia seed
    modeling
    Opis:
    This article presents the feasibility for the removal of Aniline Blue dye (AB dye) from aqueous solution using a low cost biosorbent material Zizyphus oenoplia seeds. In this study, a batch mode experiments of the adsorption process were carried out as a function of pH, contact time, concentration of dye, adsorbent dosage and temperature. The experimental data were fitted with Freundlich and Langmuir isotherm equations. The feasibility of the isotherm was evaluated with dimensionless separation factor (RL). The kinetic data of sorption process are evaluated by using pseudo-first order and pseudo-second order equations. The mode of diffusion process was evaluated with intra-particle diffusion model. The thermodynamic parameters like change in enthalpy (ΔHº); change in entropy (ΔSº) and Gibbs free energy change (ΔGº) were calculated using Van’t Hoff plot. The biosorbent material was characterized with Fourier Transform Infrared (FTIR) spectroscopy and the morphology was identified with Scanning Electron Microscope (SEM) in before and after adsorption of AB dye.
    Źródło:
    Polish Journal of Chemical Technology; 2015, 17, 3; 70-77
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biological degradation of metribuzin and profenofos by some efficient bacterial isolates
    Autorzy:
    Tamilselvan, C.
    Joseph, S.J.
    Mugunthan, G.
    Sathish Kumar, A.
    Syed Musthaq Ahamed, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/11692.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    biological degradation
    metribuzin
    profenofos
    bacterial isolate
    Pseudomonas aeruginosa
    Staphylococcus aureus
    Bacillus subtilis
    Opis:
    The soil sample was collected from the paddy field of Sriperumbudur, Tamilnadu which is having a history of repeated pesticide applications. The isolation of efficient pesticide degrading bacteria was identified as Pseudomonas aeruginosa, Staphylococcus aureus and Bacillus subtilis. The growth of the three pesticide degrading isolates was assessed in Minimal salt broth containing 25 ppm of pesticides. Two popularly used pesticides Metribuzin and Profenofos were selected for this study. Among the three bacterial isolates, the bacteria Bacillus subtilis utilized the pesticides effectively and showed maximum growth. The growth of the three pesticides degrading isolates Pseudomonas aeruginosa, Staphylococcus aureus and Bacillus subtilis was assessed in Minimal salt broth containing 25 ppm of pesticides at different temperature levels (25 °C, 30 °C, 35 °C, 40 °C, 45 °C, 50 °C & 55 °C) and pH levels (pH 4, pH 5, pH 6, pH 7 & pH 8) and carbon sources (Lactose, Dextrose, Fructose, Mannose & Galactose) and nitrogen sources Peptone, Yeast extract, Beef extract, Malt extract and Casein respectively. The maximum growth rate of bacteria was recorded at 35 °C and pH 6. The maximum growth of bacteria was in the presence of Dextrose followed by Fructose, Galactose and Mannose. The least growth was recorded in Lactose broth culture. The maximum growth of bacteria was in the presence of Malt extract followed by Peptone, Yeast extract and Casein. The least growth was recorded in Beef extract broth culture. The bacterial isolates showed maximum growth in the Minimal salt broth containing Profenofos followed by Metribuzin.
    Źródło:
    International Letters of Natural Sciences; 2014, 09
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Knowledge, attitude and practice on exposure to Bisphenol A among dental surgeons in Southern India
    Autorzy:
    Kumar, H.A.
    Soans, C.R.
    Murali, P.S.
    Ravi, R.S.
    Shashidhar, K.
    Shersha, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082822.pdf
    Data publikacji:
    2021
    Wydawca:
    Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
    Tematy:
    knowledge
    attitude
    practice
    Bisphenol A
    composite
    dental surgeons
    Opis:
    Background. Bisphenol A (BPA) is a product in the manufacture of Bis-GMA, which is commonly used in dentistry, and is known to have a number of adverse effects. Objectives. The aim of this study is to evaluate to assess the knowledge, attitude and practice based on exposure and handling of BPA containing materials among dental surgeons for better understanding about the level of care rendered to the patients. Material and methods. A questionnaire survey was conducted on 400 dental surgeons in Southern India. The questionnaire consisted of 20 objective type questions out of which ten questions assessed knowledge and five questions assessed the attitude and five questions to understand the practice related measures taken by the dentist. The data collected were analysed using SPSS version 23. Results. A total of 402 responses were collected for this online questionnaire survey over a period of 2 months. It was found that females showed higher knowledge and attitude towards exposure to BPA which was statistically significant when compared to males. It showed that dentists with more than 20 years of practice had a higher level of knowledge. Though most of the groups agreed fairly on safety practice to be undertaken related to BPA exposure in their clinics, the ones with experience more than 20 years displayed the least positive attitude and dentists with 6-10 years of practice had the least positive behaviour among all. Conclusions. In spite of having a good knowledge regarding the harmful effects of BPA, dental surgeons are not very cautious while using materials containing them on a regular basis. Therefore, there is a need to enhance the awareness with the help of Continuing Dental Education programs or proper instructions on the packaging.
    Źródło:
    Roczniki Państwowego Zakładu Higieny; 2021, 72, 4; 443-451
    0035-7715
    Pojawia się w:
    Roczniki Państwowego Zakładu Higieny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Elastic Properties of Double-Layered Manganite $La_{1.2}Sr_{1.8-x}Ba_xMn_2O_7$ (x=0.0-0.4)
    Autorzy:
    Reddy, Y.
    Prashanth Kumar, V.
    Ramesh, S.
    Venkanna, S.
    Ramana Reddy, M.
    Kistaiah, P.
    Vishnuvardhan Reddy, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812358.pdf
    Data publikacji:
    2008-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.47.Gk
    75.47.Lx
    Opis:
    The elastic behavior of the sol-gel prepared double-layered manganite system $La_{1.2}Sr_{1.8-x}Ba_xMn_2O_7$ (x = 0.0-0.4) was investigated at 300 K, employing ultrasonic pulse transmission technique at 1 MHz. The values of elastic moduli and acoustic Debye temperature $(θ_D)$ were computed from longitudinal and shear velocities. The measured values were corrected to zero porosity using Hasselman and Fulrath's formula. The elastic constants of the samples, estimated using Modi's heterogeneous metal-mixture rule, were also reported. The variation of elastic moduli with Ba concentration was interpreted in terms of strength of interatomic bonding.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 6; 1687-1694
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    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:
    Satellite estimates of the long-term trend in phytoplankton size classes in the coastal waters of North-Western Bay of Bengal
    Autorzy:
    Miranda, J.
    Lotliker, A.A.
    Baliareingh, S.K.
    Jena, A.K.
    Samanta, A.
    Sahu, K.C.
    Kumar, T.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2079007.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    phytoplankton
    size class
    coastal water
    long-term variability
    satellite data
    statistical analysis
    Bengal Bay
    Opis:
    The study presents long-term variability in satellite retrieved phytoplankton size classes (PSC) at two coastal sites, off Gopalpur and Visakhapatnam, in the north-western Bay of Bengal. The abundance-based models by Brewin et al. (2010) (B10) and Sahay et al. (2017) (S17), for retrieval of PSC (micro, nano, and picophytoplankton), from satellite data, were validated. Both the models performed well in the retrieval of nano and microphytoplankton. However, B10 performed poorly in retrieving picophytoplankton. The statistical analysis indicated better performance of the S17 model and hence was applied to Moderate Resolution Imaging Spectroradiometer onboard Aqua satellite (MODISA) data to understand the temporal (at monthly climatology) and spatial variability (from nearshore to offshore). The spatial distribution indicated nearshore dominance of micro and offshore dominance of picophytoplankton. In nearshore waters off Gopalpur, microphytoplankton dominated throughout the year except for months of south-west monsoon (June and July) where the dominance of picophytoplankton was observed. All PSC exhibited similar distribution at an annual scale with a primary peak during pre-monsoon (March and April) and a secondary peak during post-monsoon (September— November). However, microphytoplankton concentration during post-monsoon was higher off Gopalpur in comparison to Visakhapatnam. The higher microphytoplankton concentration during pre-monsoon was attributed to recurrent phytoplankton blooms. Whereas, post-monsoon increment could be attributed to enhanced phytoplankton growth by availing nutrients sourced from monsoonal precipitation induced terrigenous influx. The outcome of the present study recommends the use of the S17 model for satellite retrieval of PSC from the north-western Bay of Bengal.
    Źródło:
    Oceanologia; 2021, 63, 1; 40-50
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Thermal Comfort Properties of Different Kinds of Polyester Knitted Fabrics
    Badanie właściwości komfortu termicznego różnych rodzajów dzianin poliestrowych
    Autorzy:
    Mohapatra, Shradhanjali
    Vidya, T.
    Kumar, D. Vasanth
    Rajwin, A. Jebastin
    Babu, V. Ramesh
    Prakash, C.
    Shah, B. Anas
    Roy, Reetuparna
    Powiązania:
    https://bibliotekanauki.pl/articles/2056314.pdf
    Data publikacji:
    2021
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    comfort
    knitted fabric
    microdenier polyester
    polyester
    single jersey
    thermal comfort
    komfort
    dzianina
    poliester microdenier
    poliester
    komfort termiczny
    Opis:
    This research focused on the thermal comfort behaviour of polyester with respect to the type of yarn (spun, micro denier, continuous filament and hollow), linear density of the yarn (111 and 166 dtex), and the loop length of knitted fabric (0.25, 0.27 and 0.29 cm).The air permeability of continuous filament yarn fabric and micro denier yarn knitted fabrics was noted to be higher than that of spun yarn knitted fabrics. 111 dtex micro denier yarn fabric has the highest air permeability and 111 dtex spun yarn fabric the lowest air permeability value among all the other fabric samples. Comparatively, coarser spun yarn fabric has lower air permeability characteristics than finer microdenier fabric.The water permeability of the fabric shows a significant difference between the spun yarn, continuous filament yarn and Micro denier yarn knitted fabrics and between the linear density of the yarn. The water vapour permeability of spun yarn of 166 dtex single jersey fabric is higher, while the water vapour permeability of continuous filament yarn fabric of 166 dtex is lower. The thermal conductivity value is high for continuous filament polyester fabric of 100 D and low for microdenier polyester fabric of 166 dtex. Based on the statistical analysis, it is clearly shown that there are significant differences between the three different polyester yarn fabrics of two different denier of the same fabric. Furthermore, the count and different polyester yarn affect the comfort properties of single jersey fabrics.
    Badania koncentrowały się na zachowaniu komfortu cieplnego poliestru w odniesieniu do rodzaju przędzy, gęstości liniowej przędzy (111 dtex i 166 dtex) oraz długości pętelki dzianiny (0,25 cm, 0,27 cm oraz 0,29 cm). Zbadano właściwości wytworzonych dzianin takie jak: przepuszczalność powietrza, wody, pary wodnej oraz przewodność cieplną, a wyniki poddano analizie statystycznej.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2021, 5 (149); 50--55
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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