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SUBHASH CHANDER CHETAL 한국원자력학회 2015 Nuclear Engineering and Technology Vol.47 No.3
Twenty sodium-cooled fast reactors (SFRs) have provided valuable experience in design, licensing, and operation. This paper summarizes the important safety criteria and safety guidelines of intermediate sodium systems, steam generators, decay heat removal systems and associated construction materials and in-service inspection. The safety criteria and guidelines provide a sufficient framework for design and licensing, in particular by new entrants in SFRs.
Subhash Chander Arora,Preeti Dharmarha 대한수학회 2006 대한수학회보 Vol.43 No.4
In this paper, we show that ifT is a hyponormal opera-tor on a non-separable Hilbert spaceH, then Re!0(T) !0(ReT),where !0(T) is the weighted Weyl spectrum of weight with @0 h := dim H. We also give some conditions under which theproduct of two-Weyl operators is-Weyl and its converse implica-tion holds, too. Finally, we show that the weighted Weyl spectrumof a hyponormal operator satises the spectral mapping theoremfor analytic functions under certain conditions.
Weighted composition operators on Lorentz spaces
Subhash Chander Arora,Gopal Datt,Satish Verma 대한수학회 2007 대한수학회보 Vol.44 No.4
In this paper we characterize the boundedness, compactnessand closedness of the range of the weighted composition operators onLorentz spacesL(p;q), 1< p 1 , 1 q 1 .
Arora Subhash Chander,Dharmarha Preeti Korean Mathematical Society 2006 대한수학회보 Vol.43 No.4
In this paper, we show that if T is a hyponormal operator on a non-separable Hilbert space H, then $Re\;{\omega}^0_{\alpha}(T)\;{\subset}\;{\omega}^0_{\alpha}(Re\;T)$, where ${\omega}^0_{\alpha}(T)$ is the weighted Weyl spectrum of weight a with ${\alpha}\;with\;{\aleph}_0{\leq}{\alpha}{\leq}h:=dim\;H$. We also give some conditions under which the product of two ${\alpha}-Weyl$ operators is ${\alpha}-Weyl$ and its converse implication holds, too. Finally, we show that the weighted Weyl spectrum of a hyponormal operator satisfies the spectral mapping theorem for analytic functions under certain conditions.
WEIGHTED COMPOSITION OPERATORS ON LORENTZ SPACES
Arora, Subhash Chander,Datt, Gopal,Verma, Satish Korean Mathematical Society 2007 대한수학회보 Vol.44 No.4
In this paper we characterize the boundedness, compactness and closedness of the range of the weighted composition operators on Lorentz spaces L(p,q), $1<p{\leq}{\infty},\;1{leq}q{leq}{\infty}$.
Magnetic behaviour of nanocrystalline Ni–Cu ferrite and the effect of irradiation by 100 MeV Ni ions
S.N. Dolia,Ravi Kumar,S.K. Sharma,M.P. Sharma,Subhash Chander,M. Singh 한국물리학회 2008 Current Applied Physics Vol.8 No.5
The effects of 100 MeV Ni ion irradiation on magnetic properties of nanoparticles of Ni0.8Cu0.₂Fe₂O₄ with average particle sizes of 40Å and 60Å , synthesized by chemical co-precipitation method have been studied. The spinel cubic structures were confirmed by XRD. The average particle size estimated by XRD and by Langevin function fitting are in good agreement for both the pristine and irradiated samples. The blocking temperature increases with particle size and does not change after irradiation. On irradiation by 100 MeV Ni ions, significant changes in the hysteresis loop features are observed, which may be attributed to formation of cluster of defects in the nanocrystalline samples due to swift heavy ion (SHI) irradiation. It is also found that SHI irradiation produces more dominant changes in the hysteresis loop of smaller particle size of 40Å as compared to that of 60Å. The effects of 100 MeV Ni ion irradiation on magnetic properties of nanoparticles of Ni0.8Cu0.₂Fe₂O₄ with average particle sizes of 40Å and 60Å , synthesized by chemical co-precipitation method have been studied. The spinel cubic structures were confirmed by XRD. The average particle size estimated by XRD and by Langevin function fitting are in good agreement for both the pristine and irradiated samples. The blocking temperature increases with particle size and does not change after irradiation. On irradiation by 100 MeV Ni ions, significant changes in the hysteresis loop features are observed, which may be attributed to formation of cluster of defects in the nanocrystalline samples due to swift heavy ion (SHI) irradiation. It is also found that SHI irradiation produces more dominant changes in the hysteresis loop of smaller particle size of 40Å as compared to that of 60Å.
Alternating and Merged Droplets in a Double T-junction Microchannel
Harish Palani Naga Surya,Sajeesh Parayil,Utsab Banerjee,Subhash Chander,Ashis Kumar Sen 한국바이오칩학회 2015 BioChip Journal Vol.9 No.1
In this work, we report experimental andnumerical studies of alternating and merged dropletsin a double T-junction microchannel. The microchanneldevice is fabricated using PDMS substrate and experimentsare performed with mineral oil with surfactantas the continuous phase and aqueous glycerol asthe discrete phase. Based on the flow rate fraction φand Capillary number Ca, four different flow regimesare identified: merging, stable alternating droplets, alternatingdroplets with transition and laminar. A numericalmodel that employs volume-of-fluid formulationsis used to predict the alternating droplet generationprocess. In the stable alternating droplet regime,the effect of the discrete phase flow rate ratio α on thedroplet diameter ratio β is experimentally studied andcompared with that predicted from the simulations. Itis observed that the droplet diameter ratio β increaseslinearly with increase in the flow rate ratio α and agood match between experiments and simulations isobserved. The diameters of droplets at different Capillarynumbers Ca generated using single and doubleT-junction microchannels are compared and it is observedthat, at low Ca, the double T-junction generateslarger droplets as compared to single T-junction. In merged droplet regime, the effect of the continuousphase flow rate Qc and discrete phase viscosity μd ondiameter dm and interdistance between the droplets λof the merged droplets are studied. It is observed thatthe merged droplet diameter dm is reduced and interdistancebetween the droplets λ increases with increasein the continuous phase flow rate Qc. As the viscosityof the discrete phase μd increases, the diameter dm andinterdistance between the droplets λ of the mergeddroplets decreases.
Madan, Renu,Pathy, Sushmita,Subramani, Vellaiyan,Sharma, Seema,Mohanti, Bidhu Kalyan,Chander, Subhash,Thulkar, Sanjay,Kumar, Lalit,Dadhwal, Vatsla Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.11
Background: Dosimetric comparison of two dimensional (2D) radiography and three-dimensional computed tomography (3D-CT) based dose distributions with high-dose-rate (HDR) intracavitry radiotherapy (ICRT) for carcinoma cervix, in terms of target coverage and doses to bladder and rectum. Materials and Methods: Sixty four sessions of HDR ICRT were performed in 22 patients. External beam radiotherapy to pelvis at a dose of 50 Gray in 27 fractions followed by HDR ICRT, 21 Grays to point A in 3 sessions, one week apart was planned. All patients underwent 2D-orthogonal and 3D-CT simulation for each session. Treatment plans were generated using 2D-orthogonal images and dose prescription was made at point A. 3D plans were generated using 3D-CT images after delineating target volume and organs at risk. Comparative evaluation of 2D and 3D treatment planning was made for each session in terms of target coverage (dose received by 90%, 95% and 100% of the target volume: D90, D95 and D100 respectively) and doses to bladder and rectum: ICRU-38 bladder and rectum point dose in 2D planning and dose to 0.1cc, 1cc, 2cc, 5cc, and 10cc of bladder and rectum in 3D planning. Results: Mean doses received by 100% and 90% of the target volume were $4.24{\pm}0.63$ and $4.9{\pm}0.56$ Gy respectively. Doses received by 0.1cc, 1cc and 2cc volume of bladder were $2.88{\pm}0.72$, $2.5{\pm}0.65$ and $2.2{\pm}0.57$ times more than the ICRU bladder reference point. Similarly, doses received by 0.1cc, 1cc and 2cc of rectum were $1.80{\pm}0.5$, $1.48{\pm}0.41$ and $1.35{\pm}0.37$ times higher than ICRU rectal reference point. Conclusions: Dosimetric comparative evaluation of 2D and 3D CT based treatment planning for the same brachytherapy session demonstrates underestimation of OAR doses and overestimation of target coverage in 2D treatment planning.