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Search Results: 1 - 10 of 51262 matches for " Malay Y. Bhatt "
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Imaging Manifestations of Mediastinal Fat Necrosis
Malay Y. Bhatt,Santiago Martínez-Jiménez,Melissa L. Rosado-de-Christenson,Kenneth R. Watson,Christopher M. Walker,Jeffrey R. Kunin
Case Reports in Radiology , 2013, DOI: 10.1155/2013/323579
Abstract: Mediastinal fat necrosis (MFN) or epipericardial fat necrosis, as it is commonly referred to in the literature, is a rare self-limiting cause of chest pain of unclear etiology. MFN affects previously healthy individuals who present with acute pleuritic chest pain. Characteristic computed tomography (CT) findings include a fat attenuation lesion with intrinsic and surrounding increased attenuation stranding. There is often associated thickening of the adjacent pericardium and/or pleural effusions. We present two cases of MFN manifesting as ovoid fat attenuation lesions demarcated by a soft tissue attenuation rim with intrinsic and surrounding soft tissue attenuation stranding and review the clinical and pathologic features of these lesions. Knowledge of the clinical presentation of patients with MFN and familiarity with the characteristic imaging findings of these lesions should allow radiologists to prospectively establish the correct diagnosis and suggest conservative management and follow-up. 1. Introduction Mediastinal fat necrosis (MFN) is a rare self-limiting cause of chest pain, with the first reported cases dating back to 1957 [1]. In the current literature, “epipericardial” or “epicardial” fat necrosis is the term used to identify this condition [2–4]. However, as the juxtapericardial mediastinal fat is characteristically affected, we propose that the term MFN is more appropriate given the anatomical location of the disease process. MFN classically affects previously healthy individuals who present with acute pleuritic chest pain that raises concern for an acute cardiopulmonary process including pulmonary thromboembolic and coronary artery diseases [1–12]. We present two cases of MFN and discuss their clinical, pathologic, and imaging findings. In both cases, the affected patients presented with severe chest pain and no associated physical examination findings or specific laboratory abnormalities. The presentation of acute pleuritic chest pain in association with CT findings of an ovoid juxtapericardial fat attenuation lesion with intrinsic and surrounding increased attenuation stranding, thickening of the adjacent pericardium, and resolution on follow-up imaging can be collectively used to establish the diagnosis [2]. Making the correct diagnosis prospectively mitigates unnecessary testing in favor of conservative management. 2. Case Reports Case 1. A 51-year-old man presented with dyspnea and left pleuritic chest pain that radiated to his back. His physical exam and laboratory tests were normal. PA and lateral chest radiographs showed a small
Calixarenes and Their Biomimetic Applications
Y. K. Agrawal,Harshit Bhatt
Bioinorganic Chemistry and Applications , 2004, DOI: 10.1155/s1565363304000159
Abstract:
A Different Approach for Big Bang Singularity  [PDF]
Malay Kanti Sikdar
Natural Science (NS) , 2018, DOI: 10.4236/ns.2018.104016
Abstract: With the discovery of Hubble Red Shift in the cosmological Universe, the question of Big Bang explosion has become inevitable and to explain this point of singularity thereon. Dissolution and manifestation of the universe happen to occur periodically. In this paper,analysis has been undertaken on the basis of scientific development on well accepted cosmological model, different scientific concepts and on one Vedic/Tantric scriptural remark. According to Vedic/Tantric scriptural remark, at the time of dissolution of the universe it remains in the form of gram. Different scientific tools like Electron Microscopy, X-rays powder diffraction method. Raman & UV spectroscopy have been applied in analyzing the two parts of gram and finally to find out what do they correspond to cosmological analysis of Big Bang singularity. Main mechanisms in action in dissolution and manifestation have also been pointed out.
The foliar trichomes of Hypoestes aristata (Vahl) Sol. ex Roem. & Schult var aristata (Acanthaceae) a widespread medicinal plant species in tropical sub-Saharan Africa: with comments on its possible phylogenetic significance
Bhatt,A; Naidoo,Y; Nicholas,A;
Biological Research , 2010, DOI: 10.4067/S0716-97602010000400004
Abstract: the micromorphology of foliar trichomes of hypoestes aristata var. aristata was studied using stereo, light and scanning microscopy (sem). this genus belongs to the advanced angiosperm family acanthaceae, for which few micromorphological leaf studies exist. results revealed both glandular and non-glandular trichomes, the latter being more abundant on leaf veins, particularly on the abaxial surface of very young leaves. with leaf maturity, the density of non-glandular trichomes decreased. glandular trichomes were rare and of two types: long-stalked capitate and globose-like peltate trichomes. capitate trichomes were observed only on the abaxial leaf surface, while peltate trichomes were distributed on both adaxial and abaxial leaf surfaces.
The foliar trichomes of Hypoestes aristata (Vahl) Sol. ex Roem. & Schult var aristata (Acanthaceae) a widespread medicinal plant species in tropical sub-Saharan Africa: with comments on its possible phylogenetic significance
A Bhatt,Y Naidoo,A Nicholas
Biological Research , 2010,
Abstract: The micromorphology of foliar trichomes of Hypoestes aristata var. aristata was studied using stereo, light and scanning microscopy (SEM). This genus belongs to the advanced angiosperm family Acanthaceae, for which few micromorphological leaf studies exist. Results revealed both glandular and non-glandular trichomes, the latter being more abundant on leaf veins, particularly on the abaxial surface of very young leaves. With leaf maturity, the density of non-glandular trichomes decreased. Glandular trichomes were rare and of two types: long-stalked capitate and globose-like peltate trichomes. Capitate trichomes were observed only on the abaxial leaf surface, while peltate trichomes were distributed on both adaxial and abaxial leaf surfaces.
Floristic Composition and Change in Species Diversity over Long Temporal Scales in Upper Bhotekoshi Hydropower Project Area in Nepal  [PDF]
Ramesh Prasad Bhatt, Sarala Bhatt
American Journal of Plant Sciences (AJPS) , 2016, DOI: 10.4236/ajps.2016.71004
Abstract: Forest and vegetation of particular ecosystem is generally influenced by external factors especially from development activities. Nepal has been endowed with an immense variety of forest resources with its unique biodiversity. The current study is conducted in the temperate forest of central Nepal to compare the state of vegetation recorded during 1995 with the present condition. To identify floristic composition, species distribution and diversity, same location and same size of quadrates were selected in natural forest and planted or regenerated area as in previous study. Measurement and analytical tools for forest and vegetation reveled a total of 19 species and 341 individuals in 0.14 ha regenerated area and 18 species, 17 genera and 260 individuals in 0.16 ha, natural forest areas. However, in 1995, total 31 individuals of 20 woody species, 18 genera and 15 families were recorded within the sampling plots of 0.16 ha of natural forest. Moreover, Alnus nepalensis is found dominating regenerated area and Caryopteris odorata in natural forests whereas in 1995, Litsea chartacea and Maesa chisia were recorded dominant. The Shannon’s diversity H’ = 2.908, E = 0.970 and Var H’ = -0.00 and Simpsons D = 0.027 recorded in 1995 is found to be with higher values when compared with the analysis of present study. Furthermore, in comparison to 1995 study, this study showed lower basal area and timber volume with declining species diversity. Although, the natural forest is found with higher species composition compared to rehabilitated forest, species of herbs and shrubs were found extensively growing.
A Comparison of VaR Estimation Procedures for Leptokurtic Equity Index Returns  [PDF]
Malay Bhattacharyya, Siddarth Madhav R
Journal of Mathematical Finance (JMF) , 2012, DOI: 10.4236/jmf.2012.21002
Abstract: The paper presents and tests Dynamic Value at Risk (VaR) estimation procedures for equity index returns. Volatility clustering and leptokurtosis are well-documented characteristics of such time series. An ARMA (1, 1)-GARCH (1, 1) approach models the inherent autocorrelation and dynamic volatility. Fattailed behavior is modeled in two ways. In the first approach, the ARMA-GARCH process is run assuming alternatively that the standardized residuals are distributed with Pearson Type IV, Johnson SU, Manly’s exponential transformation, normal and t-distributions. In the second approach, the ARMA-GARCH process is run with the pseudonormal assumption, the parameters calculated with the pseudo maximum likelihood procedure, and the standardized residuals are later alternatively modeled with Mixture of Normal distributions, Extreme Value Theory and other power transformations such as John-Draper, Bickel-Doksum, Manly, Yeo-Johnson and certain combinations of the above. The first approach yields five models, and the second ap-proach yields nine. These are tested with six equity index return time series using rolling windows. These models are compared by computing the 99%, 97.5% and 95% VaR violations and contrasting them with the expected number of violations.
Charged oscillator in a heat bath in the presence of a magnetic field & third law of thermodynamics
Malay Bandyopadhyay
Physics , 2008,
Abstract: The quantum thermodynamic behaviour of a charged oscillator in the presence of a magnetic field and coupled to a heat bath through different coupling schemes is obtained analytically. It is shown that finite dissipation substitutes the zero-coupling result of exponential decay of entropy by a power law behaviour at low temperature. For the coordinate-coordinates coupling scheme the low temperature explicit results for the case of Ohmic, exponentially correlated and more generalized heat bath models are derived. In all the above mentioned cases free energy and entropy vanish linearly with temperature ($T$) as $T\to 0$ in conformity with Nernst's theorem. It is seen that coordinate (velocity)-velocities (coordinates) coupling is much more beneficial than the coordinate-coordinates coupling to ensure third law of thermodynamics. The case of radiation heat bath shows $T^3$ decay behaviour for entropy as $T\to 0$. It is observed that at low temperature free energy and entropy decay faster for the velocity-velocities scheme than any other coupling schemes. This implies velocity-velocities coupling scheme is the most advantageous coupling scheme in restoring the third law of thermodynamics. It is shown that the low temperature thermodynamic functions are independent of magnetic field for all the above mentioned cases except the without dissipation case.
Nucleation of superconductivity under rapid cycling of electric field
Malay Bandyopadhyay
Physics , 2009,
Abstract: The effect of an externally applied high frequency oscillating electric field on the critical nucleation field of superconductivity in the bulk as well as at the surface of a superconductor is investigated in details in this work. Starting from the linearized time dependent Ginzburg-Landau (TDLG) theory and using the variational principle we have shown the analogy between a quantum harmonic oscillator with that of the nucleation of superconductivity in bulk and a quantum double oscillator with that of the nucleation at the surface of a finite sample. The effective Hamiltonian approach of Cook {\it et al} \cite{cook} is employed to incorporate the effect of an externally applied highly oscillating electric field. The critical nucleation field ratio is also calculated from the ground state energy method. The results obtained from these two approximated theories agree very well with the exact results for the case of undriven system which establishes the validity of these two approximated theories. It is observed that the highly oscillating electric field actually increases the bulk critical nucleation field ($H_{c_2}$) as well as the surface critical nucleation field ($H_{c_3}$) of superconductivity as compared to the case of absence of electric field ($\varepsilon_0=0$). But the externally applied rapidly oscillating electric field accentuates the surface critical nucleation field more than the bulk critical nucleation field i.e. the increase of $H_{c_3}$ is 1.6592 times larger than that of $H_{c_2}$.
Dissipative Tunneling in 2 DEG: Effect of Magnetic Field, Impurity and Temperature
Malay Bandyopadhyay
Physics , 2005, DOI: 10.1088/1742-5468/2006/03/L03001
Abstract: We have studied the transport process in the two dimensional electron gas (2DEG) in presence of a magnetic field and a dissipative environment at temperature T. By means of imaginary time series functional integral method we calculate the decay rates at finite temperature and in the presence of dissipation. We have studied decay rates for wide range of temperatures -- from the thermally activated region to very low temperature region where the system decays by quantum tunneling. We have shown that dissipation and impurity helps the tunneling. We have also shown that tunneling is strongly affected by the magnetic field. We have demonstrated analytical results for all the cases mentioned above.
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