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Wyszukujesz frazę "Ramalingam, A." wg kryterium: Wszystkie pola

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    Wyświetlanie 1-8 z 8
    Tytuł:
    Nonlinear Characterization of Safranin O Dye for Application in Optical Limiting
    Autorzy:
    Balaji, G.
    Rekha, R.
    Ramalingam, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1505339.pdf
    Data publikacji:
    2011-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.70.Jk
    42.65.-k
    82.35.-x
    Opis:
    The optical nonlinearity of safranin O dye in methanol solution at different concentrations and as a solid film with polymethylmethacrylate (PMMA) has been studied using cw Nd-YAG laser at 532 nm as the source of excitation. The optical responses were characterized by measuring the intensity dependent refractive index $(n_2)$ of the medium using the Z-scan technique. The open aperture Z-scan trace of the dye in solution and solid sample displayed saturable absorption. The closed aperture Z-scan trace of the dye exhibited a negative (defocusing) nonlinearity. The nonlinear refractive index was found to vary with concentration. Optical limiting characteristics of the dye at various concentrations in solution were studied. The nonlinearity appears to be of thermal origin.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 3; 359-363
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of bergenin on the kidney of C57BL/6J mice with high fat-diet induced oxidative stress
    Autorzy:
    Sagadevan, A.
    Ramalingam, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/11714.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Opis:
    The present study evaluated the protective effect of bergenin on high fat diet (HFD) induced diabetic mice. C57BL/6J mice were segregated in two groups, one fed standard diet (NC) and the other fed HFD for 16 weeks. Mice were fed continuously with high fat diet for 16 weeks and subjected to intragastric administration of bergenin (10, 20 and 40 mg/kg body weight (BW)), metformin (25 mg/kg BW) 9 to 16 weeks. At the end of the treatment nephritic markers, lipid peroxidation product, antioxidant and histopathological examination were carried out to assess the efficacy of the treatment. HFD fed mice showed increased plasma glucose, insulin, altered nephritic markers, antioxidant and histopathological abnormalities. Oral Treatment with bergenin (40 mg/kg BW) showed near normalized levels of plasma glucose, lipid peroxidation product, antioxidants, improved insulin and reduced kidney damage. The effects of bergenin were comparable with standard drug, metformin. These data suggest that bergenin protect kidney from deleterious effect of glucose.
    Źródło:
    International Letters of Natural Sciences; 2016, 54
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A comparative assessment of operating characteristics of a diesel engine using 20% proportion of different biodiesel diesel blend
    Autorzy:
    Ramalingam, Senthil
    Rajendran, Silambarasan
    Ganesan, Pranesh
    Powiązania:
    https://bibliotekanauki.pl/articles/243735.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    biodiesel diesel blend
    performance
    emission
    diesel engine
    Opis:
    The objective of the present work is to find out the viable substitute fuel for diesel and control of pollutants from compression ignition engines. Therefore, in this present investigation an attempt has been made to study the effect of 20% proportion of five different biodiesel diesel blend in diesel engine. The 20% proportion of biodiesel such as Jatropha, Pongamia, Mahua, Annona and Nerium and 80% of diesel and it is denoted as J20, P20, M20, A20 and N20 are used in the present investigation. The experimental results showed that the brake thermal efficiency of the different biodiesel blend is slightly lower when compared to neat diesel fuel. However, N20 blend, have shown improvement in performance and reduction in exhaust emissions than that of other biodiesel diesel blends. From, the experimental work, it is found that biodiesel can be used up to 20% and 80% of diesel engine without any major modification. The conducted experiments were conducted on a four cylinder four stroke DI and turbo charged diesel engine using biodiesel blends of waste oil, rapeseed oil, and corn oil with normal diesel. The peak cylinder pressure of the engine running with bio diesel was slightly higher than that of diesel. The experiments were conducted on a four cylinder four stroke diesel engine using bio diesel made from corn oil.
    Źródło:
    Journal of KONES; 2019, 26, 1; 127-140
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vibration control using a modern control system for hybrid composite flexible robot manipulator Arm
    Autorzy:
    Ramalingam, S.
    Mohideen, S. Rasool
    Powiązania:
    https://bibliotekanauki.pl/articles/27314189.pdf
    Data publikacji:
    2022
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    composite material
    Al6082 alloy
    simulation analysis
    vibration amplitude
    LQR controller
    Opis:
    In this research, a model of a robotic manipulator flexible structure and an equation of motion for controller design is planned. The structural material chosen for the robot structure was a hybrid composite. A comparison study was carried out for the aluminium 6082 alloy for the flexible manipulator arm application. Vibration behavior and control implementation was analyzed by adding joint flexibility in the system. Using a simulation algorithm, the system parameter calculation is carried out through MATLAB software for vibration amplitude, transient period, steady-state error, and settling time of flexible robotic arm system. In a systematized motion equation, flexible robotic deflections are organized via the assumed mode (AM) and Lagrange techniques (LT). The graph analysis of hybrid composite and AL6082 materials with high stiffness coefficients is plotted. These obtained values from the plot are utilized for Linear Quadratic Regulator (LQR) controller design. The LQR output facts for both aluminium structural robotic arm and composite material robotic arms are established.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2022, 16, 2; 36--45
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recent Studies on the Properties of Pervious Concrete; A Sustainable Solution for Pavements and Water Treatment
    Autorzy:
    Vijavalakshmi, Ramalingam
    Powiązania:
    https://bibliotekanauki.pl/articles/2051695.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    pervious concrete
    permeability
    porosity
    pavements
    purification
    clogging
    mitigating urban heat
    beton porowaty
    przepuszczalność
    porowatość
    chodniki
    oczyszczanie
    kolmatacja
    łagodzenie miejskiego ciepła
    Opis:
    Pervious concrete a sustainable solution with limited fines or no fines and interconnected voids, has many environmental benefits, such as reducing the stormwater run-off, improving the groundwater table, reducing water pollution, and mitigating urban heat island. Many research works have been done in Pervious Concrete (PC) by varying different parameters such as, types of aggregate, aggregate gradation, water-to-cement (w/c) ratio, cement-to-aggregate ratio, geopolymer binder, ultra-high strength Matrix and compaction techniques. All these parameters have direct influences on the strength, porosity, permeability, hydraulic efficiency and durability characteristics of PC. The main aim of this paper is to review the recent work carried out in pervious concrete under six different categories (i) Effect of binders, coarse aggregate, admixtures and fibers used in PC (ii) Mechanical and durability properties (iii) pore structure characteristics (iv) Study on Clogging Effect (v) Role of PC in the water purification process and (vi) Numerical model in PC.
    Źródło:
    Civil and Environmental Engineering Reports; 2021, 31, 3; 54-84
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cloning of a Rift Valley Fever fusion gene in a plant virus derived replicon vector
    Autorzy:
    Omosimua, Rebecca Oziohu
    Iyappan, Gowtham
    Obembe, Olawole
    Ogunkanmi, Adebayo
    Sathishkumar, Ramalingam
    Powiązania:
    https://bibliotekanauki.pl/articles/1193478.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    DNA Cloning
    Escherichia coli DH5α cells
    PBYR2e3K2Mc-GFP
    PBYR2e3K2Mc-RVFV
    RVF disease
    RVFV fusion gene
    bean yellow dwarf derived vector
    emerging disease
    geminivirus vector
    zoonotic disease
    Opis:
    Rift Valley fever (RVF) disease is an emerging viral zoonotic disease caused by Rift Valley fever virus (RVFV). RVF disease is seemingly becoming more severe in endemic populations and in areas of new outbreak. RVF disease is listed by WHO as requiring urgent research and development attention. There is no therapeutics or licensed vaccine for human use in the case of an eventual outbreak. There is a need to clone RVFV genes in cloning vectors which may be useful to produce antigens in plant cells or may be tested directly as DNA vaccines. A synthesized Rift Valley fever virus fusion gene was cloned in a bean yellow dwarf virus derived replicon vector; PBYR2e3K2Mc-GFP by removing and replacing the GFP gene. The cloned PBYR2e3K2Mc-RVFV fusion gene was confirmed by PCR, restriction digestion and DNA sequencing. This cloned RVFV fusion gene in plant virus vector can be used for subsequent protein expression in plants cells or used directly tested as DNA vaccines in future studies.
    Źródło:
    World Scientific News; 2021, 158; 159-172
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Investigations to Study the Effectiveness of Cepstral Features to Detect Surface Fatigue Wear Development in a FZG Spur Geared System Subjected to Accelerated Tests
    Autorzy:
    Amarnath, Muniyappa
    Praveen Krishna, I. R.
    Krishnamurthy, Ramalingam
    Powiązania:
    https://bibliotekanauki.pl/articles/1945641.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    cepstrum
    stiffness
    pitting
    wear
    spur gear
    Opis:
    Gears are essential machine elements used to transmit power and motion from one unit to another under desired angular velocity ratio. Various types of gears have been developed to fulfill power transmission requirements in industrial applications. Under normal or fluctuating operating conditions, increase in fatigue load cycles, transition in lubrication regimes, fluctuating loads and speeds, etc., result in various surface fatigue wear modes which affect the performance of geared system. The severity of wear anomalies developed on gear tooth surfaces can be assessed by using vibration signals acquired from the gear box. On the other hand, reliable wear assessment is very important to perform maintenance action which depends on the sensors, data acquisition procedure, vibration signal analysis and interpretation. This paper presents results of the experimental investigations carried out to assess initiation and propagation of surface fatigue failure wear modes developed on gear tooth contact surfaces. A FZG back to back power recirculation type spur gearbox was used to conduct fatigue test experiments on spur gears under accelerated test conditions. Accelerated test conditions resulted in a rapid transition of lubrication regimes, i.e., hydrodynamic lubrication regime to boundary lubrication regime which triggered surface fatigue faults on gear tooth surfaces. A cepstral analysis method was used to assess fault severity in the geared system. The results obtained from the cepstral features were correlated to various surface fatigue faults and reduction in gear tooth stiffness. Results obtained from the experimental investigations highlighted the suitability of cepstral features to assess incipient faults developed on spur gear tooth surfaces.
    Źródło:
    Archives of Acoustics; 2021, 46, 3; 479-489
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A deep hybrid model for human-computer interaction using dynamic hand gesture recognition
    Autorzy:
    Ramalingam, Brindha
    Angappan, Geetha
    Powiązania:
    https://bibliotekanauki.pl/articles/38702766.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    dynamic hand gesture
    human-computer interaction
    long short-term memory
    convolutional neural network
    dynamiczny gest ręki
    interakcja człowiek-komputer
    pamięć krótkotrwała
    konwolucyjna sieć neuronowa
    Opis:
    Dynamic hand gestures attract great interest and are utilized in different fields. Amongthese, man-machine interaction is an interesting area that makes use of the hand to providea natural way of interaction between them. A dynamic hand gesture recognition system isproposed in this paper, which helps to perform control operations in applications such asmusic players, video games, etc. The key motivation of this research is to provide a simple, touch-free system for effortless and faster human-computer interaction (HCI). As thisproposed model employs dynamic hand gestures, HCI is achieved by building a modelwith a convolutional neural network (CNN) and long short-term memory (LSTM) net-works. CNN helps in extracting important features from the images and LSTM helpsto extract the motion information between the frames. Various models are constructedby differing the LSTM and CNN layers. The proposed system is tested on an existing EgoGesture dataset that has several classes of gestures from which the dynamic gesturesare utilized. This dataset is used as it has more data with a complex background, actionsperformed with varying speeds, lighting conditions, etc. This proposed hand gesture recognition system attained an accuracy of 93%, which is better than other existing systemssubject to certain limitations.
    Źródło:
    Computer Assisted Methods in Engineering and Science; 2023, 30, 3; 263-276
    2299-3649
    Pojawia się w:
    Computer Assisted Methods in Engineering and Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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