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    Wyświetlanie 1-9 z 9
    Tytuł:
    Enhanced algorithm for energy optimization and improvised synchronization in knee exoskeleton system
    Autorzy:
    Arunamithra, J.
    Saravanan, R.
    Venkatesh Babu, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/24200592.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    knee exoskeleton
    feature extraction
    data classification
    ANN algorithm
    egzoszkielet kolana
    ekstrakcja cech
    klasyfikacja danych
    algorytm ANN
    Opis:
    Purpose: The purpose of the study is to develop an augmented algorithm with optimised energy and improvised synchronisation to assist the knee exoskeleton design. This enhanced algorithm is used to estimate the accurate left and right movement signals from the brain and accordingly moves the lower-limb exoskeleton with the help of motors. Design/methodology/approach: An optimised deep learning algorithm is developed to differentiate the right and left leg movements from the acquired brain signals. The obtained test signals are then compared with the signals obtained from the conventional algorithm to find the accuracy of the algorithm. Findings: The obtained average accuracy rate of about 63% illustrates the improvised differentiation in identifying the right and left leg movement. Research limitations/implications: The future work involves the comparative study of the proposed algorithm with other classification technologies to extract more reliable results. A comparative analysis of the replaceable and rechargeable battery will be done in the future study to exhibit the effectiveness of the proposed model. Originality/value: This study involves the extended study of five frequency regions namely alpha, beta, gamma, delta and theta, to handle the real-time EEG signal processing exoskeleton, model.
    Źródło:
    Archives of Materials Science and Engineering; 2022, 117, 2; 79--85
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chemically Modified Cellulose Capped Zinc Oxide Nanocomposite: Spectral and Optical Properties
    Autorzy:
    Jagadeeswari, R.
    Selvakumar, P.
    Jeevanantham, V.
    Saravanan, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2049414.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    chemically modified cellulose
    hydrothermal
    XRD
    surface morphology
    effective mass approximation
    Opis:
    In this study, a new chemically modified cellulose polymer-capped ZnO nanopowder prepared by hydrothermal method using chemically modified cellulose polymer as capping agent was successfully reported. The structural characteristics of CMC-capped ZnO nanopowder was reported by FTIR, XRD, SEM and EDX studies. XRD results revealed crystallographic properties like crystal composition, phase purity and crystallite size of the prepared CMC-capped ZnO nanopowder and average size calculated by Debye Scherrer formula as 14.66 nm. EDX studies revealed that the presence of elemental compositions of capping agent in the nanopowder samples. The optical characterization of the CMC-capped ZnO nanopowder was studied using UV absorption (λ max = 303 nm) and PL spectroscopy (λ ex = 295 nm). The average crystal diameter and grain size were calculated by effective mass approximation formula and compared with XRD findings that agreed well and verified CMC capped ZnO with particle size of 193 nm. Thus, the promising optical characteristics shown by the synthesized CMC capped ZnO nanopowders exposes its potential usage in bio-medical fields.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 3; 911-915
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Advanced helical gear reducer design optimization through nature inspired algorithms
    Autorzy:
    Ebenezer, N. Godwin Raja
    Saravanan, R.
    Ramabalan, S.
    Navaneethasanthakumar, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1178368.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    CS
    DIN Standards
    FA
    GA
    Helical gear reducer design
    MATLAB solvers fmincon
    Nature inspired Algorithms SA
    metaheuristics
    optimization
    Opis:
    In this paper a high power helical gear pair design optimization problem is solved. It is a multi variable, complex non linear problem with derived objective function and constraints. The objective is to minimize the volume of the gear. The design parameters considered are module, face width, number of teeth on drive and driven and helix angle. The various factors for sizing and strength of gear geometry parameters are based on German Institute for Standardization (DIN) Standards. Nature inspired algorithms, namely, Simulated Annealing (SA), Fire fly (FA) and Cuckoo Search (CS) and MATLAB solvers fmincon, GA are used. Simulation results are analysed and compared with literature.
    Źródło:
    World Scientific News; 2017, 77, 2; 267-280
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Worm Gear Drive optimization Considering Industry Constraints Based on Nature Inspired Algorithms
    Autorzy:
    Ebenezer, N. Godwin Raja
    Saravanan, R.
    Ramabalan, S.
    Navaneethasanthakumar, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1179011.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    CS
    FA
    Gear optimization
    Industry relevant constraints
    MATLAB solvers GA
    Nature inspired algorithms SA
    Worm gear drive
    fmincon
    Opis:
    This paper presents a novel method to obtain optimum design for a worm gear drive used in sugar industries taking into account certain constraints of industrial relevance. The objective of this research is to minimize volume of worm gear drive. Gear ratio, face width and pitch circle diameters of worm and worm wheel are considered as design variables. Industry relevant constraints viz. gear strength capacity, wear capacity, thermal capacity, dynamic load, self locking, and face width are considered. Besides this other constraints such as maximum power transmission capacity, centre distances, deflection of worm and beam strength of worm are also considered. Nature inspired optimization algorithms, namely, Simulated Annealing (SA), Firefly (FA), Cuckoo Search (CS) and MATLAB solvers fmincon and GA are used for solving this problem in MATLAB environment. Results of simulation are analysed and presented.
    Źródło:
    World Scientific News; 2017, 87; 205-221
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on the Change in Characteristics of Ring Yarn during Post Spinning and Yarn Dyeing Operations
    Badanie zmian właściwości przędz pierścieniowych podczas przędzenia i barwienia
    Autorzy:
    Saravanan, A. R.
    Subramanian, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/231968.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    yarn abrasion
    cone winding
    hairiness
    ring spinning
    ring yarn
    singeing
    yarn imperfections
    yarn tenacity
    yarn dyeing
    ścieranie przędzy
    nawijanie stożka
    włochatość
    wirowanie pierścienia
    przędza pierścieniowa
    niedoskonałości przędzy
    wytrzymałość przędzy
    barwienie przędzy
    Opis:
    The origin of yarn hairiness has been attributed to the escape of fibres from the twisting action from within the spinning triangle. The protruding fibres entangle themselves due to the rubbing of yarn with parts of the machinery during post spinning operations and form thin places, thick places and neps. In this study, cotton combed yarns were produced by removing 14, 16 and 18% of the noil at the comber. These samples were dyed before and after singeing. The hairiness, imperfections and tenacity of the yarns were measured. The results revealed that an increase in comber noil causes a decrease in imperfections at the ring bobbin stage. The imperfections changed at different stages of post spinning operations and dyeing, and finally the difference was not appreciable, especially when the noil % was extracted beyond a certain level. The tenacity of yarn decreased when the ring bobbin was converted into a cone form, singed and dyed. Removal of a higher level of comber noil or singeing did not make a significant difference at the dyed yarn stage, although there was difference at the ring bobbin and cone stages.
    Pochodzenie włochatości przędzy przypisuje się ucieczce włókien podczas procesu skręcania. Wystające włókna splątują się w wyniku styczności przędzy z częściami maszyn podczas operacji przędzenia i tworzą pocienienia i wzgrubienia. W pracy wytworzono przędze czesankowe, które następnie barwiono przed i po opalaniu. Zmierzono włochatość, niedoskonałości i wytrzymałość przędz. Wyniki ujawniły, że niedoskonałości przędz zmianiły się na różnych etapach operacji po przędzeniu i farbowania, a na końcu różnica nie była znacząca. Wytrzymałość przędzy zmniejszyła się, gdy cewka pierścieniowa została przekształcona w postać stożka. Usunięcie wyższego poziomu zgrubienia lub uskoki nie spowodowało istotnej różnicy w poziomie wybarwienia przędzy.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2018, 3 (129); 35-39
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Finite difference solution of unsteady flow past an oscillating semi-infinite vertical plate with variable surface temperature and uniform mass flux
    Autorzy:
    Muthucumaraswamy, R.
    Saravanan, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/955236.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    promieniowanie
    płyta pionowa
    strumień masy
    radiation
    vertical plate
    finite differences
    variable temperature
    uniform mass flux
    Opis:
    A finite difference solution of an unsteady flow past an oscillating semi-infinite vertical place with variable temperature and uniform mass flux is presented here. The fluid considered here is a gray, absorbing-emitting radiation but a non-scattering medium. The dimensionless governing equations are solved by an efficient, more accurate, and unconditionally stable and fast converging implicit scheme. The steady state velocity, temperature and concentration profiles are shown graphically. The effect of velocity and temperature for different physical parameters such as the thermal radiation, Schmidt number, thermal Grashof number and mass Grashof number is studied. It is observed that the velocity decreases in the presence of thermal radiation. It is also observed that the time taken to reach a steady-state is more in the case of vertical plate than horizontal plate.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2014, 19, 4; 709-724
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Surface Chemical Treatment of Himalayan Nettle and Investigation of Surface, Physical and Mechanical Characteristics in Treated Nettle Fibre
    Autorzy:
    Deepa, R.
    Kumaresan, K.
    Saravanan, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/27765089.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    alkaline treatment
    Himalayan nettle
    fibre extraction
    plant fibre
    nettle yarn
    Opis:
    The main focus of this work was the effect of chemical alkaline treatment on Himalayan nettle fibre extraction and the characterization analysis of surface-modified nettle fibre. Nettle fibre is an eco-friendly material naturally grown in the Himalayan hills of India, and it is replacing man-made fibres. The fibres are primarily bound to each other and, in turn, to the core of the plant with pectin, lignin, and gums, which begin to break down through fungal, bacterial, enzymes and chemical treatment action. The stem from the nettle plant is fibrous and has a high-quality fibre to develop nettle yarn, which is utilized to make clothes and handicrafts, mostly aimed at generating livelihood opportunities for the rural tribe’s people. This method of extraction is an effective chemical treatment for enhancing interfacial adhesion between nettle fibres and the epoxy, which is one of the significant challenges to their usage in textiles. In this paper, nettle fibres treated with chemicals such as 1% sodium hydroxide (NaOH), 0.5% sodium sulphite (Na2SO3), 0.05% ethylenediaminetetraacetic acid (EDTA), and 2% acetic acid (CH3COOH). The impact of bacterial and chemical treatments on nettle fibre and untreated nettle fibre was characterized by Fourier transform infrared spectroscopy (FTIR) analysis, which is used to study the functional elements, Scanning electron microscopy (SEM) images revealed that there is a fibre breaking mechanism and cross-section of yarn twist formation, physical and mechanical characteristics were then determined for fibre tensile strength, fibre length, Young’s modulus, elongation break, fineness, and moisture content.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 2; 571--578
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of Electrochemical Micromachining Performance using TOPSIS, VIKOR and GRA for Magnetic field and UV rays heated Electrolyte
    Autorzy:
    Saravanan, K. G.
    Thanigaivelan, R.
    Soundarrajan, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2086874.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electrolyte
    magnet
    UV heating
    TOPSIS
    VIKOR
    GRA
    elektrolit
    magnes
    ogrzewanie UV
    Opis:
    The application of micro components in various fields such as biomedical, medical, automobile, electronics, automobile and aviation significantly improved. To manufacture the micro components, different techniques exist in the non-traditional machining process. In those techniques, electrochemical micromachining (ECMM) exhibits a unique machining nature, such as no tool wear, non-contact machining process, residual stress, and heat-affected zone. Hence, in this study, micro holes were fabricated on the copper work material. The sodium nitrate (NaNO₃) electrolyte is considered for the experiments. During the experiments, magnetic fields strength along with UV rays are applied to the electrolyte. The L₁₈ orthogonal array (OA) experimental design is planned with electrolyte concentration (EC), machining voltage (MV), duty cycle (DC) and electrolyte temperature (ET). The optimization techniques such as similarity to ideal solution (TOPSIS), VlseKriterijumska Optimizacija I Kompromisno Resenje (VIKOR) and grey relational analysis (GRA) were employed to find the optimal parameter combinations. The entropy weight method is used to assess the weight of responses such as MR and OC. The optimal combination using TOPSIS, VIKOR and GRA methods shows the same results for the experimental runs 8, 9 and 7, and the best optimal parameter combination is 28 g/l EC, 11 V MV, 85 % DC and 37°C ET. Based on the analysis of variance (ANOVA) results, electrolyte concentration plays a significant role by contributing 86 % to machining performance. The second and least contributions are DC (3.86 %) and ET (1.74 %) respectively on the performance. Furthermore, scanning electron microscope (SEM) images analyses are carried out to understand the effect of magnetic field and heated electrolyte on the work material.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 5; e138816, 1--10
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Activity pattern and food habits of Grizzled Giant Squirrel (Ratufa macroura) in Srivilliputhur Grizzled Squirrel Wildlife Sanctuary, Tamil Nadu, Southern India
    Autorzy:
    Babu Rao, G.
    Nagarajan, R.
    Saravanan, M.
    Baskaran, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/11307.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Opis:
    Activity pattern and food habits of Grizzled Giant Squirrel were investigated in Srivilliputhur Grizzled Giant Squirrel Wildlife Sanctuary from December 2011 to March 2012. Focal animal sampling method was used to record the activity pattern and food habits. Sampling was done in three different habitats viz., Private land, Reserve forest and Temple land. Feeding was the dominant activity accounting for 35.4% of the activity period. Bimodal feeding pattern was observed in Squirrels, the observations were made from early morning hours to till (0600-1800) late evening hours. The Squirrels feed upon 23 plant species; among them 11 were trees species, 10 climbers and 2 shrubs. Seven types of plant parts were used by Squirrels. Leaf consumption was high (38%) followed by fruit (24%). The high consumption of leaves was due to easy availability of leaves and limited availability of other plant parts. Squirrel‟s invasion into Private Land and Temple Land was observed which can be attributed to abundance and easy availability of food plants, canopy continuity and less predatory pressure.
    Źródło:
    International Letters of Natural Sciences; 2015, 05
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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