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Search Results: 1 - 10 of 93 matches for " Sanat Wagle "
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The Corrosion Behavior of Ni3Al/Ni3V Two-Phase Intermetallic Compounds in Various Acidic Solutions
Gadang Priyotomo,Hideyuki Momono,Sanat Wagle,Kenji Okitsu,Akihiro Iwase,Yasuyuki Kaneno,Rokuro Nishimura,Takayuki Takasugi
International Journal of Corrosion , 2012, DOI: 10.1155/2012/626240
Abstract: The corrosion behavior of the Ni3Al/Ni3V two-phase intermetallic compounds with and without minor elements (Nb, Co, and Cr) to be composed of L12 phase (Ni3Al) and a mixed phase of L12 (Ni3Al) and D022 (Ni3V) has been investigated by using an immersion test in 0.5?kmol/m3 HCl, H2SO4, and HNO3 solutions. The surface morphology was observed before and after the immersion test by scanning electron microscope (SEM). The results were compared to those of the L12 single-phase Ni3(Si,Ti) and austenitic stainless steel type 304. In all acidic solutions, preferential dissolution of ( ) phase was found in Ni3Al/Ni3V, but no intergranular attack, whereas the attacks took place on Ni3(Si,Ti). The Ni3Al/Ni3V showed a higher corrosion resistance in HCl solution and a lower resistance in HNO3 solution than Ni3(Si,Ti) and type 304. The addition of the minor elements enhanced corrosion resistance in HNO3 solution, but not clearly in HCl and H2SO4 solutions. In HCl and H2SO4, their weight losses during the immersion test were almost the same. 1. Introduction Recently, Ni-Al-V intermetallic compounds with a two-phase microstructure of Ni3Al (L12) and Ni3V (D022) phases have been developed by Takasugi et al. [1–13] and are confirmed to exhibit a highly coherent interface between these constituent phases. They have superior mechanical properties (i.e., high creep rapture life, high hardness, low thermal expansion, and better thermal conductivity) and also have high tensile strength and fracture toughness over a broad range of temperature in comparison with those of Inconel 750, Inconel 718 and Hastelloy [1–13]. Therefore, the Ni3Al/Ni3V two-phase intermetallic compounds are a candidates as materials in land-based, marine-based, and aero-gas turbine industries (turbine blade), high strength nut and bolt, and high temperature bearing or high temperature tool [8, 9, 14]. However, many studies revealed that the intermetallic compounds containing aluminum are very susceptible to hydrogen embrittlement [15–18], where hydrogen embrittlement takes place with permeation of atomic hydrogen formed by corrosion reaction into the compounds. Hence, to suppress this environmental embrittlement a small amount of boron was added to these compounds. However, it was reported that the boron segregation at grain boundaries became the preferential dissolution site and led to the intergranular attack in the L12 single-phase Ni3(Si,Ti) [19]. Furthermore, Ni base intermetallic compounds such as single-phase Ni3(Si,Ti) have attractive properties for high-temperature structural material (e.g., high
Clinical experiments in keratoplasty
Wagle G
Indian Journal of Ophthalmology , 1959,
Abstract:
Book review
Wagle Ajeet
Indian Journal of Ophthalmology , 2000,
Abstract:
Dielectric properties of thin film Al/Sb2Pb1Se7/Al devices
Wagle, Shaila;Shirodkar, Vinay;
Brazilian Journal of Physics , 2000, DOI: 10.1590/S0103-97332000000300012
Abstract: metal - glass metal, mgm, thin film devices are prepared using vacuum deposition of sb2pb1se7 compound. the capacitance and the loss tangent variation as a function of temperature and frequency is studied. the observed characteristics are explained using small signal ac circuit analysis. it is shown that the theoretical curve generated using the ac circuit analysis gives excellent fitting with the experimental curve.
Space-charge-limited conduction in thin film Al/Sb2Pb1Se7/Al devices
Wagle, Shaila;Shirodkar, Vinay;
Brazilian Journal of Physics , 2000, DOI: 10.1590/S0103-97332000000200019
Abstract: thin film al/sb2pb1se7/al, mgm, sandwiched structures, prepared using thermal evaporation technique have been studied. the dc measurements at low electric field suggest that the electrical transport is governed by space charge limited conduction (sclc) mechanism. the detailed analysis of current-voltage limited conduction (sclc) mechanism characteristics on the basis of sclc theory reveals the presence of uniformly distributed trap density of the order of 1023 m-3 ev-1 with average activation energy 0.48 ev.
Space-charge-limited conduction in thin film Al/Sb2Pb1Se7/Al devices
Wagle Shaila,Shirodkar Vinay
Brazilian Journal of Physics , 2000,
Abstract: Thin film Al/Sb2Pb1Se7/Al, MGM, sandwiched structures, prepared using thermal evaporation technique have been studied. The DC measurements at low electric field suggest that the electrical transport is governed by space charge limited conduction (SCLC) mechanism. The detailed analysis of current-voltage limited conduction (SCLC) mechanism characteristics on the basis of SCLC theory reveals the presence of uniformly distributed trap density of the order of 10(23) m-3 eV-1 with average activation energy 0.48 eV.
Dielectric properties of thin film Al/Sb2Pb1Se7/Al devices
Wagle Shaila,Shirodkar Vinay
Brazilian Journal of Physics , 2000,
Abstract: Metal - glass metal, MGM, thin film devices are prepared using vacuum deposition of Sb2Pb1Se7 compound. The capacitance and the loss tangent variation as a function of temperature and frequency is studied. The observed characteristics are explained using small signal ac circuit analysis. It is shown that the theoretical curve generated using the ac circuit analysis gives excellent fitting with the experimental curve.
Antifungal Activities of Essential Oils and Crude Extracts of Some Aromatic Plants Against Fusarium Rot of Trichosanthes dioica
Bina Wagle,Usha Budathoki
Nepal Journal of Science and Technology , 2012, DOI: 10.3126/njst.v13i2.7720
Abstract: This experiment was conducted for assessing the antifungal activities of essential oils and crude extracts of some aromatic plants against Fusarium rot of Trichosanthes dioica was at the Central Department of Botany. Pathogenicity test was taken for the confirmation of disease by transferring the inoculum from pure culture. For the control of the above fungus essential oils and extracts of five aromatic plants Zanthoxylum armatum , Mentha arvensis, Amomum subulatum, Valeriana jatamansi and Cymbopogon flexuosus were used. Each oil and extracts were diluted in different concentration in 80% acetone and in distilled water respectively. The value of minimum inhibitory concentration and percentage of mycelia growth inhibition of oil and extracts were obtained as, oil of C. flexuosus showed the higest fungitoxicity (100%) at the 5.0 and 50 ?lml-1 concentration followed by Z. armatum , M. arvensis, A. subulatum and V. jatamansi were found to be 10 and 100 ?lml-1 respectively also the higest percentage of mycelial growth inhibitors were found to be C. flexuosus followed by A. subulatum, Z. armatum , M. arvensis and V. jatamansi . Similarly extracts of C. flexuosus followed by Z. armatum , A. subulatum, V. jatamansi and M .arvensis respectively. Nepal Journal of Science and Technology Vol. 13, No. 2 (2012) 97-102 DOI: http://dx.doi.org/10.3126/njst.v13i2.7720
Performance Analysis Of An Improved Graded Precision Localization Algorithm For Wireless Sensor Networks
Sanat Sarangi,Subrat Kar
International Journal of Computer Networks & Communications , 2010,
Abstract: In this paper an improved version of the graded precision localization algorithm GRADELOC, calledIGRADELOC is proposed. The performance of GRADELOC is dependent on the regions formed by theoverlapping radio ranges of the nodes of the underlying sensor network. A different region pattern couldsignificantly alter the nature and precision of localization. In IGRADELOC, two improvements aresuggested. Firstly, modifications are proposed in the radio range of the fixed-grid nodes, keeping in mindthe actual radio range of commonly available nodes, to allow for routing through them. Routing is notaddressed by GRADELOC, but is of prime importance to the deployment of any adhoc network,especially sensor networks. A theoretical model expressing the radio range in terms of the celldimensions of the grid infrastructure is proposed, to help in carrying out a deployment plan whichachieves the desirable precision of coarse-grained localization. Secondly, in GRADELOC it is observedthat fine-grained localization does not achieve significant performance benefits over coarse-grainedlocalization. In IGRADELOC, this factor is addressed with the introduction of a parameter that could beused to improve and fine-tune the precision of fine-grained localization..
Pindeshwor: The place of Linga and Mahantas
Sanat Kumar Baral
Researcher: A Research Journal of Culture and Society , 2013, DOI: 10.3126/researcher.v1i1.8377
Abstract: DOI: http://dx.doi.org/10.3126/researcher.v1i1.8377 ?
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