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

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    Wyświetlanie 1-8 z 8
    Tytuł:
    Measuring In-Plane Liquid Spread in Fabric Using an Embedded Image Processing Technique
    Pomiar rozprzestrzeniania strefy zwilżonej za pomocą automatycznej analizy obrazu
    Autorzy:
    Raja, D.
    Koushik, C. V.
    Ramakrishnan, G.
    Subramaniam, V.
    Ramesh Babu, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/232513.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    komfort
    transport cieczy
    rozprzestrzenianie się strefy zwilżonej
    automatyczna analiza obrazu
    przetwarzanie obrazu
    comfort
    liquid transport
    wetting
    spreading
    in-plane wicking
    image processing
    Opis:
    A new technique based on the embedded image processing principle is described to measure the in-plane liquid spread in fabric as a function of time. The water spreading area recorded with a digital camera and the picture analysing process was automated by use of an image segmentation algorithm: background subtraction. Where commercial image analysing software fails due to the specific porous structure of textiles, the algorithm developed succeeds in calculating the wicking area automatically. The speed and accuracy of area calculation are also improved by using a 32bit embedded Digital Signal Processor. The in-plane spreading of an area for ring, compact yarn of different counts and different combinations of doubled yarn produced from ring, compact & ring/compact yarn was carried out. It was found that the yarn count and doubling combinations influence the liquid spread behaviour of the fabric significantly.
    Opracowano nową metodę określania rozprzestrzeniania się wody na tkaninie w funkcji czasu. Zastosowano kamerę cyfrową oraz zautomatyzowano proces analizy obrazów, stosując algorytm umożliwiający eliminację tła w sygnale podstawowym. Uzyskano pozytywne rezultaty w sytuacji kiedy komercyjne programy nie spełniły swojego zadania. Szybkość obliczeń i dokładność określania powierzchni zwiększono przez zastosowanie 32 bitowego procesora. Badano rozprzestrzenianie się kropli wody w tkaninach wykonanych z przędz obrączkowych klasycznych i kompaktowych. Stwierdzono, że masa liniowa przędzy oraz jej struktura wpływają istotnie na rozprzestrzenianie się cieczy.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2012, 4 (93); 72-76
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Shrinkage Defect in Castings by Quantitative Ishikawa Diagram
    Autorzy:
    Chokkalingam, B.
    Raja, V.
    Anburaj, J.
    Immanual, R.
    Dhineshkumar, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380186.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    odlew
    skurcz odlewniczy
    wada skurczu
    wykres Pareto
    diagram Ishikawy
    casting
    shrinkage defect
    Pareto chart
    Ishikawa diagram
    Opis:
    Metal casting process involves processes such as pattern making, moulding and melting etc. Casting defects occur due to combination of various processes even though efforts are taken to control them. The first step in the defect analysis is to identify the major casting defect among the many casting defects. Then the analysis is to be made to find the root cause of the particular defect. Moreover it is especially difficult to identify the root causes of the defect. Therefore, a systematic method is required to identify the root cause of the defect among possible causes, consequently specific remedial measures have to be implemented to control them. This paper presents a systematic procedure to identify the root cause of shrinkage defect in an automobile body casting (SG 500/7) and control it by the application of Pareto chart and Ishikawa diagram. with quantitative Weightage. It was found that the root causes were larger volume section in the cope, insufficient feeding of riser and insufficient poured metal in the riser. The necessary remedial measures were taken and castings were reproduced. The shrinkage defect in the castings was completely eliminated.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 1; 174-178
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of Micro-Alloying Elements for Mechanical Properties in Normalized Cast Steel Using Taguchi Technique
    Autorzy:
    Chokkalingam, B.
    Raja, V.
    Anburaj, J.
    Immanual, R.
    Dhineshkumar, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380322.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    normalized cast steel
    alloying
    mechanical properties
    Taguchi method
    microstructure
    stal znormalizowana
    stopowanie
    właściwości mechaniczne
    metoda Taguchi
    mikrostruktura
    Opis:
    In this study, Taguchi method is used to find out the effect of micro alloying elements like vanadium, niobium and titanium on the hardness and tensile strength of the normalized cast steel. Based on this method, plan of experiments were made by using orthogonal arrays to acquire the data on hardness and tensile strength. The signal to noise ratio and analysis of variance (ANOVA) are used to investigate the effect of these micro alloying elements on these two mechanical properties of the micro alloyed normalized cast steel. The results indicated that in the micro alloyed normalized cast steel both these properties increases when compared to non-micro-alloyed normalized cast steel. The effect of niobium addition was found to be significantly higher to obtain higher hardness and tensile strength when compared to other micro alloying elements. The maximum hardness of 200HV and the maximum tensile strength of 780 N/mm2 were obtained in 0.05%Nb addition micro alloyed normalized cast steel. Micro-alloyed with niobium normalized cast steel have the finest and uniform microstructure and fine pearlite colonies distributed uniformly in the ferrite. The optimum condition to obtain higher hardness and tensile strength were determined. The results were verified with experiments.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 2; 171-177
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy Savings in Foundries through Yield Improvement and Defect Reduction in Castings
    Autorzy:
    Chokkalingam, B.
    Raja, V.
    Dhineshkumar, M.
    Priya, M.
    Immanual, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/382444.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundries
    energy savings
    casting yield
    defective casting
    melting
    odlewnie
    oszczędność energii
    wydajność odlewania
    wadliwe odlewy
    topienie
    Opis:
    Energy conservation is an important step to overcome the energy crisis and prevent environmental pollution. Casting industry is a major consumer of energy among all the industries. The distribution of electrical energy consumed in all the departments of the foundry is presented. Nearly 70% of the energy is consumed especially in the melting department alone. Production of casting involves number of process variables. Even though lot of efforts has been taken to prevent defects, it occurs in the casting due to variables present in the process. This paper focuses the energy saving by improving the casting yield and by reducing the rejections. Furthermore an analysis is made on power consumption for melting in the induction furnace to produce defective castings and improvement in the casting yield. The energy consumed to produce defective castings in all other departments is also presented. This analysis reveals that without any further investment in the foundry, it is possible to save 3248.15 kWh of energy by reducing the rejections as well as by improving the casting yield. The redesign of the feeding system and the reduced major rejection shrinkage in the body casting improved the casting yield from 56% to 72% and also the effective yield from 12.89% to 66.80%.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 1; 15-18
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of a goal programming approach for safety management practices on the performance of a selected Indian construction organization
    Autorzy:
    Prasad, S.V.S. Raja
    Powiązania:
    https://bibliotekanauki.pl/articles/111769.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    safety management
    occupational health safety
    management systems
    safety performance
    goal programming
    zarządzanie bezpieczeństwem
    bezpieczeństwo i higiena pracy
    systemy zarządzania
    wskaźnik wypadków
    wypadkowość
    Opis:
    The construction industry in India is the second most important contributor to its gross domestic product. However, high rate of accidents and fatalities have tarnished the image of industry in India. Although the industry contributes significantly to the Indian economy, safety management is the primary concern alongside with frequent workplace accidents. The role of safety management is vital to improve safety performance of an organization. The functions of safety management include planning, organizing, staffing, directing, controlling and coordinating safety activities with an aim to minimize accidents/injuries. Safety trainings, employee participation, compliance of safety procedures and motivational schemes are part of safety management which influences the overall safety performance. Several metrics were developed to measure the safety performance of an organization but not a single measure will reflect the overall performance. The present study considered parameters pertaining to the safety management which have influence on the safety performance of a construction organization in India. The parameters are analyzed by formulating a goal programming model. The results of the study suggests that much improvement is needed in the area of safety trainings and the revised targets were established.
    Źródło:
    Production Engineering Archives; 2019, 24; 43-47
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Using Anthropogenic Waste (Steel Slag) to Enhance Mechanical and Wear Properties of a Commercial Aluminium Alloy A356
    Autorzy:
    Sridhar Raja, K. S.
    Bupesh Raja, V. K.
    Gupta, Manoj
    Powiązania:
    https://bibliotekanauki.pl/articles/353592.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    A356
    steel slag
    wear resistance
    tensile strength
    industrial waste
    environmental hazard
    Opis:
    The present study addresses the utilization of induction furnace steel slag which is an anthropogenic waste, for enhancing the mechanical properties of a commercial aluminium alloy A356. Different weight percentage (3wt%, 6wt%, 9wt%, and 12wt%) of steel slag particles in 1 to 10 μm size range were used as reinforcing particles in aluminium alloy A356 matrix. The composites were prepared through stir casting technique. The results revealed an improvement in mechanical properties (i.e. microhardness and tensile strength) and wear resistance with an increase in weight percentage of the steel slag particles. This research work shows promising results for the utilization of the steel slag for enhancing the properties of aluminium alloy A356 at no additional cost while assisting at same time in alleviating land pollution.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 1; 279-284
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hypolipidemic action of rutin on triton WR-1339-induced hyperlipidemia in rats
    Autorzy:
    Livingston Raja, N.R.
    Nair, A.R.
    Senthilpandian, S.
    Ravi, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2098294.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    rutin
    flavonoids
    triglyceride
    atorvastatin
    Triton WR-1339
    hyperlipidemia
    cholesterol
    rat
    Opis:
    Introduction and objective. Hyperlipidemia is considered as a serious communal problem in developed countries, caused by an excess level of cholesterol in blood circulation. It leads to chronic illness and even death in human beings. As the currently available drugs cause unexpected side-effect, the aim of this study is to concentrate on naturally occurring flavonoids which can potentially provide defensive and therapeutic effects in atherosclerosis diseases, and investigate the hypolipidemic effect of rutin on Triton WR-1339 triggered hyperlipidemia in a rat blood sample. Materials and method. Rats were randomly prearranged into five different groups of five rats each. Group-I was the non-disease control and administered normal saline. Group-II was the atherogenic control, administered Triton WR 1339 (200 mg/kg BW). Group-III was standard and received Atorvastatin. The last two groups (IV, V) were tested (I&II) by administering administered Rutin (40 mg/kg, 80 mg/kg) orally. The test material (I&II) and the standard drug were administered for seven days. After the last dose, blood samples were collected and the lipid levels estimated in the blood samples. Results. Rats treated with rutin flavonoid at a dose of 40 mg/kg & 80mg/kg exhibited a reduction in Total Cholesterol, Triglycerides, Low Density Lipoprotein (LDL) and Very Low Density Lipoprotein (VLDL). Rutin also increases the High Density Lipoprotein (HDL), compared with control rats. Rutin treated rats exhibited dose-dependent hypolipidemic activity. The protection percentage of rutin against hyperlipidemia was observed as 41.89%, 55.57% whereas the atorvastatin treated group protection was observed at 60.63%. Conclusions. The results of the study revealed that rutin showed a significant hypolipidemic effectiveness on Triton WR- 1339 induced hyperlipidemia in rats.
    Źródło:
    Journal of Pre-Clinical and Clinical Research; 2021, 15, 2; 51-55
    1898-2395
    Pojawia się w:
    Journal of Pre-Clinical and Clinical Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of flow pattern on a hydrofoil with structural and profile modification
    Autorzy:
    Chada, Jithendra Sai Raja
    Rao, B. S. V. Rama
    Powiązania:
    https://bibliotekanauki.pl/articles/2106431.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    hydrofoil
    groves
    angle of attack
    CFD
    fine mesh
    validation
    wodolot
    kąt natarcia
    walidacja
    Opis:
    Moving through water takes much more effort than walking through air, and this explains why ships travel much more slowly than automobiles and aircraft. Water is almost 1000 times denser than air, so most of the energy produced by a boat is taken up by dragging (water resistance). Hydrofoils travel much more quickly than ordinary boats, not by pushing through water but by raising the hull (the main body) of the boat upward so it can glide above the waves. Hydrofoil is one of the typical factors that affect the vortex structure and flow characteristics of hydraulic machinery. In order to enhance the utilisation efficiency of hydraulic machinery in marine energy, parallel grooves are proposed and applied to the hydrofoil. Following that, a numerical analysis is performed using the SST k- turbulence model, and the effects of the hydrofoil profile, the angle of attack and the flow are investigated. The profiles of NACA 0066, NACA 8412, NACA M2 and RAE 104 are considered for the study. The performance is analysed based on the lift to drag ratio. The best model from this is given with surface modification and the flow study is carried out at different angles of attack. The modified profile of NACA 8412 with parallel groves has shown the highest lift to drag ratio at a 12 degree angle of attack.
    Źródło:
    Journal of Mechanical and Energy Engineering; 2022, 6, 1; 27--32
    2544-0780
    2544-1671
    Pojawia się w:
    Journal of Mechanical and Energy Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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