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Search Results: 1 - 10 of 192620 matches for " D. Dutta "
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Nuclear Transparency with the gamma + n -> pi- + p Process in 4He
D. Dutta
Physics , 2003, DOI: 10.1103/PhysRevC.68.021001
Abstract: We have measured the nuclear transparency of the fundamental process $\gamma$ n $\to \pi^-$ p in $^4$He. These measurements were performed at Jefferson Lab in the photon energy range of 1.6 to 4.5 GeV and at $\theta^{\pi}_{cm}= 70^\circ$ and $90^\circ$. These measurements are the first of their kind in the study of nuclear transparency in photoreactions. They also provide a benchmark test of Glauber calculations based on traditional models of nuclear physics. The transparency results suggest deviations from the traditional nuclear physics picture. The momentum transfer dependence of the measured nuclear transparency is consistent with Glauber calculations which include the quantum chromodynamics phenomenon of color transparency.
Congenital glaucoma
Dutta L,Bujarborua D
Indian Journal of Ophthalmology , 1979,
Evaluation of the Antioxidant activity of the roots and Rhizomes of Cyperus rotundus L.
Pal D,Dutta S
Indian Journal of Pharmaceutical Sciences , 2006,
Abstract: The in vitro antioxidant activity of the roots and rhizomes of Cyperus rotundus L. has been investigated by estimating degree of non-enzymatic haemoglobin glycosylation, measured colorimetrically at 520 nm. The ethanol extract of the roots and rhizomes of C. rotundus showed higher activity, than other extracts of it. The antioxidant activity of the extracts are close and identical in magnitude, and comparable to that of standard antioxidant compounds used.
The Generalized Counting Rule and Oscillatory Scaling
D. Dutta,H. Gao
Physics , 2004, DOI: 10.1103/PhysRevC.71.032201
Abstract: We have studied the energy dependence of the $pp$ elastic scattering data and the pion-photoproduction data at 90$^\circ$ c.m. angle in light of the new generalized counting rule derived for exclusive processes. We show that by including the helicity flipping amplitudes (with energy dependence given by the generalized counting rule) and their interference with the Landshoff amplitude, we are able to reproduce the energy dependence of all cross-section and spin-correlation (A$_{NN}$) data available above the resonance region. The pion-photoproduction data can also be described by this approach, but in this case data with much finer energy spacing is needed to confirm the oscillations about the scaling behavior.
Information Entropy of conditionally exactly solvable potentials
D. Dutta,P. Roy
Physics , 2011, DOI: 10.1063/1.3566977
Abstract: We evaluate Shannon entropy for the position and momentum eigenstates of some conditionally exactly solvable potentials which are isospectral to harmonic oscillator and whose solutions are given in terms of exceptional orthogonal polynomials. The Bialynicki-Birula-Mycielski (BBM) inequality has also been tested for a number of states.
Ordinal Indices of small subspaces of $L_p$
S. Dutta,D. Khurana
Mathematics , 2014,
Abstract: We calculate ordinal $L_p$ index defined in "An ordinal L_p index for Banach spaces with an application to complemented subspaces of L_p" authored by J. Bourgain, H. P. Rosenthal and G. Schechtman, for Rosenthal's space $X_p$, $\ell_p$ and $\ell_2$. We show a subspace of $L_p$ $(2 < p < \infty)$ non isomorphic to $\ell_2$ embeds in $\ell_p$ if and only if its ordinal index is minimum possible. We also give a sufficient condition for a $\mathcal{L}_p$ subspace of $\ell_p\oplus\ell_2$ to be isomorphic to $X_p$.
Ordinal indices for complemented subspaces of l_p
S. Dutta,D. Khurana
Mathematics , 2014,
Abstract: We provide complete isomorphic invariance of a class of translation invariant complemented subspaces of L_p constructed by Bourgain, Rosenthal and Schechtman. We compute ordinal L_p-indices for this class. We further show that the isometric index of a tree subspace over a well founded tree is an invariance for the order of the tree. Finally we provide a dichotomy for the subspaces of L_p with small ordinal indices.
A Study of the Quasi-elastic (e,e'p) Reaction on $^{12}$C, $^{56}$Fe and $^{97}$Au
D. Dutta,D. van Westrum
Physics , 2003, DOI: 10.1103/PhysRevC.68.064603
Abstract: We report the results from a systematic study of the quasi-elastic (e,e'p) reaction on $^{12}$C, $^{56}$Fe and $^{197}$Au performed at Jefferson Lab. We have measured nuclear transparency and extracted spectral functions (corrected for radiation) over a Q$^2$ range of 0.64 - 3.25 (GeV/c)$^2$ for all three nuclei. In addition we have extracted separated longitudinal and transverse spectral functions at Q$^2$ of 0.64 and 1.8 (GeV/c)$^2$ for these three nuclei (except for $^{197}$Au at the higher Q$^2$). The spectral functions are compared to a number of theoretical calculations. The measured spectral functions differ in detail but not in overall shape from most of the theoretical models. In all three targets the measured spectral functions show considerable excess transverse strength at Q$^2$ = 0.64 (GeV/c)$^2$, which is much reduced at 1.8 (GeV/c)$^2$.
Pulse Oximetry: A New Tool in Pulpal Vitality Testing
Smita D. Dutta,,Rahul Maria
People's Journal of Scientific Research , 2013,
Abstract: Over the years, the thermal and electrical tests have been considered to be a suitable means of assessing thevascularity and vitality of the tooth pulp. Pulse oximetry is an effective, objective, oxygen saturation monitoring techniquebroadly used in medicine for recording blood oxygen saturation levels. It can also be used in endodontics for differentialdiagnosis of vital pulps and necrotic ones. However, there are some limitations inherent in the technology of pulseoximetry, such as the effect of increased acidity and metabolic rate, which causes deoxygenating of hemoglobin andchanges in blood oxygen saturation, also movements of the body or probe can complicate readings. This test produces nonoxious stimuli, therefore, apprehensive or distressed patients may accept it more readily than routine methods. A reviewof the literature and a discussion of the potential application of this system in endodontics is presented.
A Framework to Identify Economic and Community Benefits of the Proposed BRT System in Southeast Michigan  [PDF]
Utpal Dutta
Current Urban Studies (CUS) , 2017, DOI: 10.4236/cus.2017.52010
Abstract: In recent years, Bus Rapid Transit (BRT) has generated great interest across the United States. There are more than 20 BRT systems in existence and more are in the planning stage (including Detroit). Within the next few years, BRT will be planned and implemented phase by phase in various parts of Southeast Michigan. The purpose of this paper is to present a framework to identify probable economic and community benefits (quantitative as well as qualitative) of BRT in Southeast Michigan. Taxable Real Estate property, employment sector, population age group, daily vehicle miles traveled, as well as congestion level data were reviewed to identify Southeast Michigan’s current and future trends. A Shift-Share analysis using data from Cleveland was performed to determine BRT-advantaged age group. The authors suggested a number of action items to attract choice riders and excite transit dependent riders to the planned BRT system. Based on the literature review and analysis, the authors identified BRT-advantaged job sectors and age-groups within the Southeast Michigan region. As BRT will be implemented in phases, it will affect the amount, type and time of investment. Considering this uncertainty in implementation, projected economic benefit as a function of type and amount of investment was presented. It is to be noted that in order to achieve the desired outcome the system must be planned/designed/implemented within the context of Southeast Michigan rather than just copying a successful system from somewhere else.
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