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Search Results: 1 - 10 of 463211 matches for " Biswas A "
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Starobinsky Model in Schroedinger Description
S. Biswas,A. Shaw,D. Biswas
Physics , 1999, DOI: 10.1007/s12043-999-0115-7
Abstract: In the Starobinsky inflationary model inflation is driven by quantum corrections to the vacuum Einstein equation. We reduce the Wheeler-DeWitt equation corresponding to the Starobinsky model to a Schroedinger form containing time. The Schroedinger equation is solved with a Gaussian ansatz. Using the prescription for the normalization constant of the wavefunction given in our previous work, we show that the Gaussian ansatz demands Hawking type initial conditions for the wavefunction of the universe. The wormholes induce randomness in initial states suggesting a basis for time-contained description of the Wheeler-DeWitt equation.
Schroedinger Wheeler-DeWitt Equation In Multidimensional Cosmology
S. Biswas,A. Shaw,D. Biswas
Physics , 1999, DOI: 10.1142/S0218271801001372
Abstract: We study multidimensional cosmology to obtain the wavefunction of the universe using wormhole dominance proposal. Using a prescription for time we obtain the Schroedinger-Wheeler-DeWitt equation without any reference to WD equation and WKB ansatz for WD wavefunction. It is found that the Hartle-Hawking or wormhole-dominated boundary conditions serve as a seed for inflation as well as for Gaussian type ansatz to Schroedinger-Wheeler-DeWitt equation.
THE EFFECT OF RADOME ON RESONANCE CHARACTERISTICS OF TRIANGULAR PATCH ANTENNA
M. BISWAS,A. MANDAL
International Journal of Engineering Science and Technology , 2011,
Abstract: A simple and accurate CAD model based on cavity model analysis is proposed to predict the effect of superstrate or radome on resonant frequencies of an equilateral triangular patch antenna. The computed values for wide range of superstrate parameters and patch sizes are compared with different theoretical and experimental values available in open literature showing close agreement. A Maxwell’s equation solver is used to generate some simulated data.
In search of a new accountability: the voice of patients
Aikat A,Biswas R
theHealth , 2011,
Abstract: Background: Given existing health financing patterns in the South Asian countries, the costs associated with chronic non-communicable diseases (NCDs) are likely to weigh more heavily on those least able to afford them, increasing the risk of economic loss and impoverishment. In this context patient satisfaction analysis may emerge as a potent tool to assess, improve and make healthcare more accountable in these region.Methods: In search of quality of care rendered, through the perspective of the patients, this cross-sectional observational institution based study was carried out for a year in cardiology department of a teaching hospital in India. The study population being the patients admitted in the non-paying beds of non-intensive cardiac care unit (ICCU) and in the intensive cardiac care unit (ICCU) beds. This was carried out with the help of pre-designed and pre-tested questionnaire. Results: The patients particularly those admitted in the ICCU were satisfied with the services rendered regarding regularity of availability of drugs, clarity of communication, cleanliness of ward and economy of treatment. Among the study population, 55% of non-ICCU and 73% of ICCU patients recommended the hospital for similar patients. They cited good behaviour of doctors, economic treatment, etc as reasons for their recommendations. Shortage of staff, administrative hassles, etc remain as prime reasons for those who did not make a recommendation.Conclusion: Improving upon the patient satisfaction can ensure more effective healthcare delivery through motivated and satisfied client, who may carry on further advocacy.
Digital blood circulation in paucibacillary leprosy
Ghosh Sanjay,Biswas A
Indian Journal of Dermatology, Venereology and Leprology , 1992,
Abstract: Digital vascular flow in paucibacillary leprosy was assessed photoplethysmography (PPG). In PPG, infra-red light emitting diode and an adjacent photosensor detect the blood flow in cutaneous capillaries, as represented graphically on a strip-chart. In 29 (6F, 23 M) untreated paucibacillary leprosy patients (7TT, 16 BT and 6 purely neural type) having ailment on limb/limbs, suffering for 5 months to 12 years, PPG recording were done by applying the device to the distal phalanges of all the digits of four limbs serially with Velcro-strap at an ambient temperature of 28 °C - 30 °C and humidity of 60-70 percent. Diminished digital vascular flow of the affected limb/limbs was seen in long-standing cases suffering for > 2 years irrespective of the type, site, morphology or phase (reactional) of the disease. This may be mostly due to specific vascular changes rather than reactional or functional changes. Specific vascular changes are terminal arteritis, vasculitis of vasa nervorum or truncular arteritis, i.e.. tuberculoid lesions of the major arteries. Two patients, suffering for 1.5 years, paradoxically showed increased digital blood flow which is probably due to reactive hyperaemia or paralytic vasodilatation as a result of autosympathectomy.
Digital blood flow in systemic sclerosis
Ghosh Sanjay,Biswas A
Indian Journal of Dermatology, Venereology and Leprology , 1992,
Abstract: Digital vascular status in 10 untreated patients suffering from systemic sclerosis for 1 to 4 years was evaluated by a method called photoplethysmography (PPG). The PPG probe was attached serially to the distal phalanges of all the digits of four limbs with Velcro-strap at an ambient temperature of 28° C - 32° C and humidity of 60-65 percent to record PPG tracings. Six patients (Group A) had clinical symptoms and signs of vascular impairment whereas 4 patients (Group B) did not have. Diminished vascular flow was seen in all the patients of both the groups. On an average, 9 digits (45%) in Group A and 7 digits (35%) in Group B had reduced blood circulation. The difference between the two groups was not statistically significant (p>0.5). Degree of vascular impairment had no bearing upon the duration of the disease (rxy=+0.41). Impairment of digital blood flow may be due to organic narrowing of digital artery, functional vasomotor changes, endothelial proliferation and damage, blood hyperviscocity and less deformable red blood cells.
Assessment of physiological strain in inland fishing activity
Biswas R,Samanta A
Indian Journal of Occupational and Environmental Medicine , 2006,
Abstract: Ten fishermen aged between 19 and 48 years of age, were examined in the field during inland fishing activity, which they perform individually. Physiological strain in terms of heart rate varied between 86 and 115 beats/min with mean net cardiac cost of 32 beats/min. The average relative cardiac cost was 36%. Analysis of physiological responses revealed that the recommended limits of cardiac strain indices were surpassed during the majority of the fishing period. Average energy cost was estimated to be 3.3 kcal.min-1, which was about 34% of the VO2max. Average intensity of the workload entailed in the whole fishing shift appeared to be moderate and acceptable. Furthermore, the heat load in the working situation did not appear to be a serious threat to the health of the workers. Analysis of work revealed more static exertions in the work. To reduce the postural load and musculoskeletal discomforts of the fishermen, ergonomic interventions are required, which represents a further scope of study.
Mycosis fungoides : Tumour D′emblee
Sahoo A,Biswas M
Indian Journal of Dermatology, Venereology and Leprology , 1995,
Abstract: A 60-years old male patient presented with nodules and noduloulcerative lesions of mycosis fungoides (MF) of 6 months duration without any previous premycotic, patch or plaque stage.
Sotos syndrome: An interesting disorder with gigantism
Nalini A,Biswas Arundhati
Annals of Indian Academy of Neurology , 2008,
Abstract: We report the case of a 16-year-old boy diagnosed to have Sotos syndrome, with rare association of bilateral primary optic atrophy and epilepsy. He presented with accelerated linear growth, facial gestalt, distinctive facial features, seizures and progressive diminution of vision in both eyes. He had features of gigantism from early childhood. An MRI showed that brain and endocrine functions were normal. This case is of interest, as we have to be aware of this not so rare disorder. In addition to the classic features, there were two unusual associations with Sotos syndrome in the patient.
Equilibrium of a Brownian particle in an inhomogeneous medium: An alternative approach
Avik Biswas,A. Bhattacharyay
Physics , 2013,
Abstract: We look at the equilibrium of a Brownian particle in an inhomogeneous space following the alternative approach proposed in ref.[1]. We consider a coordinate dependent damping that makes the stochastic dynamics the one with multiplicative noise. Here we show that the mapping to an additive noise gives the equilibrium distribution of the generalized Langevin dynamics of a particle with mass. The procedure does not need inclusion of any ad hoc current cancelling term in the Langevin dynamics. The result shows a modified Maxwell-Boltzmann distribution with a damping dependent amplitude.
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