Alwar, India
Alwar, India

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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.


Sudan P.,RR College | Mathur R.,RR College | Chandrawat M.P.S.,Eternal University | Jain S.,RR College
International Journal of Pharma and Bio Sciences | Year: 2015

Rajasthan is a rocky state having oldest Aravali ranges, which are very rich in diverse minerals, particularly dolomite, granite and marble. Hence, so many industries in Rajasthan are based on these rocks. However, during mechanical processing of these minerals, about 30%-40% part is left as a waste in the form of slurry. These mineral wastes could be used as a source of macro and micronutrients for soil. XRF analysis was done to evaluate the composition of marble slurry. Result of XRF revealed that 30.52% of calcium, 9.95% of magnesium, 1.57% of iron, 0.05% of potassium, 0.09% of phosphorous and 0.07% of manganese present in it. XRF analysis of marble waste also showed the presence of ultra micro nutrients and REEs (Rare Earth Elements). It is found to be an effective combination to provide macro and micro nutrients for soil.


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.


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.


Yadav V.,Indian Central Electronics Engineering Research Institute | Yadav V.,Rr College | Yadav V.,Gyrotron Laboratory | Sharan S.,Indian Central Electronics Engineering Research Institute | And 7 more authors.
Infrared Physics and Technology | Year: 2011

This paper presents experimental results for cold testing a gyrotron open resonator. Experiments were accomplished to measure resonant frequency and their particular quality factor for TE mode at the operating frequency. The perturbation technique was used to determine the axial, radial and azimuthal electric field profile for identification of TE031 mode at operating frequency 42 GHz. The good agreement between experimental and theoretical was found. The results were quite good and suitable for suppression the undesired modes in the specific gyrotron cavity. © 2011 Elsevier B.V. All rights reserved.


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.


Yadav V.,Indian Central Electronics Engineering Research Institute | Yadav V.,Rr College | Kumar N.,Indian Central Electronics Engineering Research Institute | Singh U.,Indian Central Electronics Engineering Research Institute | And 2 more authors.
Infrared Physics and Technology | Year: 2013

The effect of interaction cavity geometry on the gyrotron performance in terms of cold cavity parameters (Q value and axial electric field profile), Ohmic wall loss, start oscillation current and interaction efficiency are analyzed in detail in this article. The measurement of Q value and axial electric field profile is also performed for the cavities with different geometries by using non-destructive and perturbation techniques, respectively. Scattering matrix code is used for the computation of Q value and axial electric field profile and results are compared with the experimental data. A Particle-in-Cell code and a specific beam-wave interaction computation code based on generalized non-linear theory are used in the efficiency calculations. For all numerical and experimental analyses, the case of 42 GHz, 200 kW gyrotron is considered here. © 2013 Elsevier B.V. All rights reserved.


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.


Yadav V.,Indian Central Electronics Engineering Research Institute | Kumar N.,Indian Central Electronics Engineering Research Institute | Singh U.,Rr College | Kumar A.,Indian Central Electronics Engineering Research Institute | And 2 more authors.
14th IEEE International Vacuum Electronics Conference, IVEC 2013 - Proceedings | Year: 2013

In this paper, the results of permittivity and loss tangent measurements of high frequency ceramics are presented. The free space method is used to measure the permittivity and loss tangent of different ceramics in the millimeter wave band (110 GHz-125 GHz). © 2013 IEEE.


Yadav V.,Indian Central Electronics Engineering Research Institute | Yadav V.,Council of Scientific and Industrial Research | Sharan S.,Indian Central Electronics Engineering Research Institute | Sharan S.,Council of Scientific and Industrial Research | And 9 more authors.
2011 IEEE International Vacuum Electronics Conference, IVEC-2011 | Year: 2011

In this paper the results of dielectric properties measurements of FC-75 (Fluoro Carbon-75) are presented, which is used in the double disk RF window of gyrotron as a coolant. The dielectric constant, the dielectric loss, the a.c. conductivity and the relaxation time are measured from 1 GHz to 50 GHz. The measurement procedure is based on reflection method. The measurements were performed by dielectric probe kit by using 50 GHz Vector Network Analyzer. The experimental results are in good agreement with design aspects of gyrotron RF window. © 2011 IEEE.

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