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Raghunath B.K.,Annamalai University | Raghukandan K.,Annamalai University | Karthikeyan R.,BITS Pilani | Palanikumar K.,Sri Sai Ram Institute of Technology | And 2 more authors.
Journal of Alloys and Compounds | Year: 2011

The flow curve is constructed by flow stress data obtained from compression test conducted at different temperature and strain rate. Accurate flow stress model is crucial for investigating magnesium alloys deformation behaviour at the elevated temperatures. An analytical method, which reflects temperature, strain and strain rate effect by introducing temperature-compensated strain rate (Zener-Hollomon Parameter), is proposed in this study. This model has been applied on the experimental data and predicted flow stress curve match well with those measurements. © 2011 Elsevier B.V.


Xu H.-Y.,Harbin University of Science and Technology | Prasad M.,CSIR - Regional Research Laboratory | Wang P.,Harbin Institute of Technology
Bulletin of the Korean Chemical Society | Year: 2010

Schorl modified by H 2SO 4 has been successfully developed to enhance schorl-catalyzed Fenton-like reaction for removal of phenol in an aqueous solution. The phenol removal percentage can be increased from 4% to 100% by the system of modified schorl and H 2O 2. Batch experiments indicate that the percent increases in removal of phenol by increasing the dosage of catalyst, temperature and initial concentration of H 2O 2. The results of XRD, FT-IR and SEM suggest that no new phases are formed after removal of phenol by modified schorl. ICP-AES results reveal that more dissolution of iron results in higher catalytic oxidant activity in the system of modified schorl and H 2O 2. Besides minor adsorption, mineralcatalyzed Fenton-like reaction governs the process.


Gupta R.,MANIT | Panthi S.K.,CSIR - Regional Research Laboratory | Srivastava S.,MANIT
Reviews on Advanced Materials Science | Year: 2016

The current article presents our approach toward the area of generation of various properties in different materials by grain refinement and also discusses different mechanism of strengthening through multi-directional forging (MDF) process (a severe plastic deformation process). During last decades, the researches in the field of multi-directional forging are growing enormously, which is making MDF, an interesting process to alter various properties of the materials along with its microstructure refinement. The modification of the various different properties of materials makes multi-directional forging process versatile, in terms of increasing processed materials applications. The present review of various literature based on different materials processed by MDF of the published data is an approach to bring in attention towards the usefulness of the process, increase of knowledge about various changed materials properties via MDF and to relate various different published results in terms of processing conditions, materials used, strain applied, and grain refinement. © 2016 Advanced Study Center Co. Ltd.


Khongsai M.,North Eastern Biodiversity Research Cell | Khongsai M.,CSIR - Regional Research Laboratory | Saikia S.P.,Central Agricultural University | Saikia S.P.,CSIR - Regional Research Laboratory | Kayang H.,North Eastern Biodiversity Research Cell
Indian Journal of Traditional Knowledge | Year: 2011

The study reveals about the vast diversity of herbal medicinal plants used by the various tribes of Arunachal Pradesh. The potential of ethnobotanical research and need for documentation of traditional knowledge pertaining to the medicinal plant utilization for the greater benefit of mankind is carried out. The investigation was performed by collection of local medicinal plants in consultation with the local tribal experts. The common medicinal plants used by Apatami, Mongpa, Sinpho and Tangsa tribes were studied and around 28 species were listed where mostly herbs are used for medicine. The Padam, Ngishi and I-Idu tribes of Arunachal Pradesh commonly used about 56 plant species as medicine from 29 families. The local people believed that dreadful diseases like cancer and diabetes can be treated with local herbal plants. Thus, the study focuses on potentials of ethnobotanical research, the needs for conservation and documentation of traditional medicinal knowledge for further availability and utilization to the benefit of mankind.


Berger S.,TU Dresden | Singh R.,TU Eindhoven | Sudha J.D.,CSIR - Regional Research Laboratory | Adler H.-J.,TU Dresden | Pich A.,RWTH Aachen
Polymer | Year: 2010

Microgel-clay composite particles were prepared by one-step surfactant-free precipitation polymerization. Laponite nanoparticles present in the reaction mixture become encapsulated during the microgel formation process. Microgel-clay composites based on poly(N-vinylcaprolactam-co-acetoacetoxyethyl methacrylate) containing different amount of incorporated clay nanoparticles were synthesized. The clay content was varied from 2 wt% to 18 wt%. The extremely high incorporation efficiency of the clay nanoparticles into microgels was detected. The size of the hybrid microgels was decreased from 700 nm to 100 nm by increase of the clay concentration in the reaction mixture. Obtained hybrid microgels exhibit negative surface charge and excellent colloidal stability. Microgel-clay composite particles display temperature-sensitive behaviour in water. The swelling degree of the hybrid microgels decreases with increase of the clay loading. Microgel-clay composite particles exhibit temperature-controlled uptake of the cationic dye, Methylene blue, and can be used as scavenger systems in aqueous media. © 2010 Elsevier Ltd.


Jain A.,CSIR - Regional Research Laboratory | Birkumar Singh H.,CSIR - Regional Research Laboratory | Kanjilal P.B.,North East Institute of Science and Technology
Indian Journal of Natural Products and Resources | Year: 2010

The Foxnut or Gorgon nut (Euryale ferox Salisb.) belonging to the family Euryalaceae and locally called as "Thangjing" in Manipuri and "Makhana" in Hindi is an important annual aquatic vegetable cash crop of Manipur. Both leaf petiole and fruits after removing the spiny cover are eaten raw or cooked and is regarded as a delicacy in the traditional cuisine and is highly preferred. The foxnut fruits are sold in the local markets of Manipur during June-October with an estimated quantity of 43.4 tonnes which fetch around Rs 3.8 lakhs annually in Imphal market alone. The agro-practice and estimation of economics of foxnut has been carried out. Around 2500 plants with plant to plant spacing of 2×2 m2 can be cultivated in one hectare of land with an annual production of 75,000 fruits which is on an average yield of 30 fruits per plant annually. The market cost of foxnut fruit varies from Rs 2-8 per fruit depending upon the size of the fruit, availability and season. Under scientific cultivation of foxnut, a total income of Rs 2.25 lakhs can be generated annually per hectare of land where Rs 2.09 lakhs is the net income.


Mary G.,Polymer Research Laboratory | Bajpai S.K.,Polymer Research Laboratory | Chand N.,CSIR - Regional Research Laboratory
Journal of Natural Fibers | Year: 2010

Apart from exhibiting excellent properties such as biocompatibility, feeling like human skin, sweat absorptivity, and comfort, cotton fabric also creates a suitable environment for microorganisms to grow because of their tendency to absorb moisture. Hence, in order to impart antibacterial properties to cotton fibers, in the current study microorganisms have been graft copolymerized with N-vinyl-2- pyrrolidone and acrylamide to produce micrometer-sized graft layer on the cotton fiber. The fibers have been loaded with Zn(II) ions to impart antibacterial character to them. The biocidal action of Zn(II) has been investigated as a function of percent grafting of polymeric chains on fibers and the concentration of Zn(II) ions in the immersion media, using zone inhibition method. Growth rates of bacterial colonies have been found to be appreciably low in the presence of Zn(II)-loaded grafted fibers. However, the grafting of cotton fibers has been found to decrease the mechanical strength of the resulting fibers. © Taylor & Francis Group, LLC.


Rout P.K.,CSIR - Central Electrochemical Research Institute | Rao Y.R.,Adityahridayam | Jena K.S.,CSIR - Regional Research Laboratory | Sahoo D.,CSIR - Central Electrochemical Research Institute | Ali S.,Hamdard University
Journal of Food Science and Technology | Year: 2014

Simarouba glauca DC is a tree of the family Simaroubaceae, which grows well up to 1,000 m above sea level in all types of well-drained soils (pH 5.5 to 8.0) and in places with 250 to 2,500 mm annual rainfall. The seed oil has been extracted both by mechanical expelling and solvent extraction. The fatty acid composition and iodine value of the oil indicate that it possesses saturated (40.8-42.6%), monounsaturated (52.9-55.0%), and polyunsaturated (2.5-3.4%) fatty acid in ratios close to that of palm oil. These characteristics are suitable for its use as edible oil. Acute oral toxicity and safety evaluation in a 13-week feeding trial on albino rats showed that the oil is comparable to groundnut oil in all the parameters. © 2012 Association of Food Scientists & Technologists (India).


Luckachan G.E.,CSIR - Regional Research Laboratory | Pillai C.K.S.,CSIR - Regional Research Laboratory
Journal of Polymers and the Environment | Year: 2011

Recent trends in biodegradable polymers indicate significant developments in terms of novel design strategies and engineering to provide advanced polymers with comparably good performance. However, there are several inadequacies in terms of either technology or cost of production especially in the case of applications in environmental pollution. So, there is a need to have a fresh perspective on the design, properties and functions of these polymers with a view to developing strategies for future developments. The paper reviews the present state-of-art on biodegradable polymers and discusses the salient features of the design and properties of biodegradable polymers. Special emphasis is given to the problems and prospects of (1) approaches adopted to make non-biodegradable synthetic polymers such as polyethylene biodegradable and (2) biodegradable polymers and copolymers made from renewable resources especially poly(lactic acid) based polymers and copolymers which are emerging as the candidate biodegradable materials for the future. © 2011 Springer Science+Business Media, LLC.


Biswas S.,Indian Institute of Science | Suwas S.,Indian Institute of Science | Sikand R.,National Physical Laboratory India | Gupta A.K.,CSIR - Regional Research Laboratory
Materials Science and Engineering A | Year: 2011

The evolution of microstructure and texture during extrusion of pure magnesium and its single phase alloy AM30 has been studied experimentally as well as by crystal plasticity simulation. Microstructure and micro-texture were characterized by electron back scattered diffraction (EBSD), bulk-texture was measured using X-ray diffraction and deformation texture simulations were carried out using visco-plastic self consistent (VPSC) model. In spite of clear indications of the occurrence of dynamic recrystallization (DRX), simulations were able to reproduce the experimental textures successfully. This was attributed to the fact that the textures were c-type fibers with their axis of rotation parallel to the c-axis and DRX leads to simply rotate the texture around the c-axis. © 2011 Elsevier B.V.

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