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Alwar, India

Chandrawat M.P.S.,Eternal University | Mathur R.,RR College
Research Journal of Pharmaceutical, Biological and Chemical Sciences | Year: 2014

Oxysalt cements were first prepared by Sorel S.T., a French chemist, in 1867. Magnesium oxysulphate cement is a combination of magnesium oxide, magnesium sulphate solution and inert filler dolomite in definite ratio. Its cementing properties are superior to that of calcareous Portland cement. When paint is added in the matrix as an additive, very encouraging results are observed. Initial incorporation of paint in the matrix accelerates the setting process. Remarkable increase in the strength and watertightness of the cement is noticed with increasing quantities of the additive. Minor contractions, within the experimental limits, are also noticed in the linear beams with the passage of time. Weathering effects of the trial block are also very encouraging. Source


Yadav V.,Indian Central Electronics Engineering Research Institute | Sharan S.,Indian Central Electronics Engineering Research Institute | Kumar N.,Indian Central Electronics Engineering Research Institute | Alaria M.K.,Indian Central Electronics Engineering Research Institute | And 2 more authors.
Proceedings - 2010 8th International Vacuum Electron Sources Conference and Nanocarbon, IVESC 2010 and NANOcarbon 2010 | Year: 2010

A open resonator for a 42GHz, 200kW gyrotron for an Indian TOKAMAK system has been designed. The RF characterization of open ended tapered cylindrical resonator for a gyrotron is considered to see the performance of the resonator before the final assembly of the device. The experimental results for cold testing of first Indian gyrotron open resonator are present in this paper. The experiments were accomplished to measure resonant frequency and their particular quality factor for TE mode at the frequency 42GHz. The resonance frequency was deterined by trasmission technique and the loaded quality factor was comuted by half power bandwidth method at -3 dB point. TE modes were exited by means of an electric probe injecting power through a 1-mm diametre hole located in the middil of the uniform section of the resonator. A pyramidal horn antenna which was connected to the vector network analyzer, was used as a reciving device to collect the RF power reradiated by the resonator. The resonance curve was directly collect from VNA display. On the behalf of the experiments, good agreement between experimental and theoretical results was found. The results were quite good and suitable for suppression the undesired modes in the specific gyrotron cavity. © 2010 IEEE. Source


Yadav V.,Indian Central Electronics Engineering Research Institute | Yadav V.,RR College | Kumar N.,Indian Central Electronics Engineering Research Institute | Kumar A.,Indian Central Electronics Engineering Research Institute | And 4 more authors.
IEEE Transactions on Plasma Science | Year: 2013

The frequency response of dielectric properties of coolant liquids used in the gyrotron RF window is measured. FC-40, FC-75, and CCl4 are considered for the measurements due to their reported application in gyrotron and excellent dielectric properties required for high-power RF transmission. A performance probe kit based on the reflection method is used for measurements in wide frequency range from 200 MHz to 50 GHz. Vector network analyzer (VNA) is used as the RF source as well as receiver. The dielectric constant and loss tangent are calculated directly by using the scattering matrix data obtained from the VNA. Further, ac conductivity and relaxation time are also computed by using measured data of loss tangent and dielectric constant. © 1973-2012 IEEE. Source


Singh U.,Indian Central Electronics Engineering Research Institute | Yadav V.,Indian Central Electronics Engineering Research Institute | Kumar N.,Indian Central Electronics Engineering Research Institute | Kumar A.,Indian Central Electronics Engineering Research Institute | And 2 more authors.
Frequenz | Year: 2013

This paper presents the design of 28 GHz, 200 kW gyrotron for Indian TOKAMAK system. The paper reports the designs of interaction cavity, magnetron injection gun and RF window. EGUN code is used for the optimization of electron gun parameters. TE03 mode is selected as the operating mode by using the in-house developed code GCOMS. The simulation and optimization of the cavity parameters are carried out by using the Particle-in-cell, three dimensional (3-D)-electromagnetic simulation code MAGIC. The output power more than 250 kW is achieved. Source


Janveja B.,Kl Mehta Dn College For Women | Sharma J.,RR College
Asian Journal of Water, Environment and Pollution | Year: 2012

Dyes represent one of the problematic groups. Though commercial activated carbon is a preferred sorbent for colour removal, its widespread use is restricted due to high cost. In the present work, the steam activated pigmented carbon prepared from rice husk (B.N. Oryza Sativa) was investigated as an adsorbent to remove Amaranth dye from aqueous solutions. The adsorbent was investigated under variable system parameters, such as, initial concentration of the aqueous dye solution, agitation time, adsorbent amount and temperature. The results of the present study have indicated that an amount of 0.8 g SAPRHC per litre could remove 43.0% of the dye from an aqueous solution of 10 ppm with agitation time 300 minutes. The interactions were tested with respect to both pseudo first-order and second-order kinetics. The later was found to be more suitable. High value of qm indicates high capacity of adsorption and the value of the coefficient b indicates that the interaction of dye with SAPRHC i.e. (dye + SAPRHC = dye....SAPRHC complex) leads to the formation of a complex, being shifted overwhelmingly towards adsorption. The results obtained indicate a potential use of SAPRHC for removing dyes like Amaranth dye from water. Source

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