Dipjyoti Mitra

indian institute of management lucknow · Department of management

We demonstrate optical cycling and sub-Doppler laser cooling of a cryogenic buffer-gas beam of calcium monohydride (CaH) molecules. We measure vibrational branching ratios for laser cooling transitions for both excited electronic states A and B. We measure further that repeated photon scattering via the A←X transition is achievable at a rate of ∽ 1...

The extraordinary success in laser cooling, trapping, and coherent manipulation of atoms has energized the efforts in extending this exquisite control to molecules. Not only are molecules ubiquitous in nature, but the control of their quantum states offers unparalleled access to fundamental constants and possible physics beyond the Standard Model....

The extraordinary success in laser cooling, trapping, and coherent manipulation of atoms has energized the efforts in extending this exquisite control to molecules. Not only are molecules ubiquitous in nature, but the control of their quantum states offers unparalleled access to fundamental constants and possible physics beyond the Standard Model....

We demonstrate optical cycling and sub-Doppler laser cooling of a cryogenic buffer-gas beam of calcium monohydride (CaH) molecules. We measure vibrational branching ratios for laser cooling transitions for both excited electronic states A and B. We measure further that repeated photon scattering via the $A\leftarrow X$ transition is achievable at a...

Iron-based alkaline rechargeable batteries are promising candidates for large-scale energy storage applications owing to their low cost, robustness and environmental-friendliness. However, the widespread deployment of iron-based batteries has been limited by the low charging efficiency and poor discharge rate capability of the iron electrode. Our p...

The instability of iron under anodic conditions makes iron-based electrode substrates unsuitable for alkaline electrolyzers and rechargeable alkaline batteries. Therefore, significantly more expensive substrates such as nickel foam or sintered nickel are used. Nickel adds a significant cost to electrolysis and energy storage systems. We show that i...

Electrolysis of aqueous solutions of alkali is a promising approach for the production of pure hydrogen. For this approach to be economical on a large scale, the overpotentials for the electrode reactions and the high-cost of nickel-based electrode substrates must be reduced. We report here on the performance of an “all-iron” electrolyzer cell that...

The use of three-dimensional porous nickel foam as the current collector of the nickel hydroxide electrode adds significantly to the cost of the nickel-based alkaline rechargeable batteries. Although iron is considerably less expensive than nickel, iron corrodes at the operating potential of the nickel hydroxide electrode. We have found that a 70–1...

Iron electrodes disintegrate in alkali at the anodic potentials needed for oxygen evolution. Hence, relatively expensive nickel-based electrodes and substrates have been the workhorse of materials for industrial water electrolysis. We report here a novel surface-modification method that transforms iron into an electrocatalytically-active and robust...

Iron is unstable as an oxygen evolution electrode in alkaline media. Thus, relatively expensive nickel-based electrodes are used in industrial alkaline water electrolysis. We show that an iron substrate can be rendered stable and electrocatalytically active for the oxygen evolution reaction by nano-scale surface modification with nickel. The electr...

Various developmental projects have come up in the coastal zone of Dakshina Kannada and Udupi districts in the last few decades. A number of beaches are subjected to erosion and lots of coastal properties are destroyed specially during SW monsoon season along the Mangalore coast in recent years. In order to protect the beaches and the properties, a...

The risk of lung cancer has been shown to be inversely related to socioeconomic status (SES). Because the Canadian Cancer Registry does not contain socioeconomic data, the 1991 Canadian Census Cohort was used to study social determinants of lung cancer risk in the general Canadian population. This study examines incidence rates of lung cancer and h...

Although childhood cancer remains the leading cause of disease-related deaths among children younger than 14 years of age, it is relatively rare. Each year, an average of 910 children are diagnosed with cancer in Canada, and 139 children die of the disease. Cancers in children differ biologically from those usually found in adults. The majority of...

The medical gas cylinders have various safety features to prevent the administration of wrong gas to the patient. Most of the features have visual impact (colour, label, markings on the cylinder body) except pin index system on the cylinder valve, so error in this feature is difficult to analyze and is highly unpredictable. We had received one such...

Aims and Objectives To observe the effects of fibroids in pregnancy and look at associated maternal and fetal complications. Methods A population-based retrospective study was conducted in a central London tertiary hospital. Women were identified from first Trimester Ultrasound scans (done between January and December 2011) database using search wo...

Cancer is the leading cause of disease-related death in children aged 1 to 14 years in Canada. Despite the importance to public health of childhood cancer, there have been few reports on Canadian trends published in the peer-reviewed literature. This study examines childhood cancer trends by age, sex, and province of residence using the most curren...

Introduction Le cancer est la principale cause de décès lié à la maladie chez les enfants de 1 à 14 ans au Canada. Malgré l’importance pour la santé publique du cancer chez les enfants, peu de rapports évalués par des pairs ont été publiés sur l’évolution de la situation au Canada. La présente étude porte sur l’évolution des cas de cancer par âge,...

In this paper, a bandwidth enhancement technique of asymmetrical slot antenna with two different excitation methods is presented. One method of excitation is the microstrip line feed, and the other is the coplanar waveguide feed. The rectangular slot excited by microstrip line feed gives an impedance bandwidth of 14.76% (|S 11| < -10 dB). When the...

Nowadays medical teachers use different audiovisual (AV) aids of teaching in their classes to make the subject more interesting and understandable. To assess the impact of three common lecture delivery methods, viz Blackboard (BB), Transparency and Over Head Projector (OHP) and Powerpoint Presentation (PP), a questionnaire based study was carried o...

Polarisation observations of millisecond pulsars taken with the Effelsberg telescope are presented. The aim of the observations is to determine the Rotation Measure of those pulsars and consequently to shed light on the magnetic field structure off the Galactic plane and in the vicinity of the Sun. Adding our sample to the already existing populat...

Effort is made to predict the along wind oscillation of a tall square building from first principles and across wind oscillation of the same from established empirical relations. The criterion for human comfort is being considered. A comparison between the limiting values of building height at different terrain conditions shows severeness of across...

Higher capacities of power plants together with increased awareness on environmental considerations have led to taller height of stacks. It is seen that strong wind can result in falling of stacks. So aerodynamic considerations of stacks is very important in order to save the falling of stacks. One stack is not enough in industries and power sector...

Effort has been made to solve the along wind oscillation problem of a tall square building from first principles and across wind oscillation problem of the same from empirical relations. The criterion for human comfort is being considered and a limiting value of height of a building for a given cross section is predicted. A comparison between the l...

The main purpose of this work was to find out reasonably correct but user-friendly discharge relationships for small head flows over a sharp-crested rectangular weir and a right-angled triangular weir which are not readily available in books or standards. The effects of various parameters like viscosity, surface tension, and velocity of approach on...

The linear polarization position angle (PPA) of pulsar emission shows a wide variety of structures, which deviates from the classical rotating vector model. In this study we investigate the effect on the PPA due to emission arising from a range of heights. We demonstrate that by appropriately choosing the emission height we can reconstruct the PPA...

We present a study of single pulses from nine bright northern pulsars to investigate the behaviour of circular polarisation, V. The observations were conducted with the Effelsberg 100-m radio telescope at 1.41 GHz and 4.85 GHz and the Westerbork radio telescope at 352 MHz. For the first time, we present the average profile of the absolute circular...

The incidence of gall stones in thalassaemia is less than that in sickle cell anaemia or hereditary spherocytosis. With adequate blood transfusions, the incidence is as low as 2%. There are not many reports on cholelithiasis in thalassaemia. A case of 24-year-old female with thalassaemia major and gall stone is reported here.

Over a period of 4 years (January 1993-December 1997), 509 patients were treated for abdominal colic with or without intestinal obstruction and a history of passage of adult roundworms either in the stool or in vomitus. All patients were below the age of 10 years, the youngest 6 months old, and were treated successfully with antispasmodics and norm...

Ossification of the posterior longitudinal ligament (OPLL) is an uncommon cause of compressive myelopathy outside Japan. A case of cervical cord compression in a female whose MRI showed OPLL is reported. T2 weighted MRI images are the most effective to evaluate both spinal cord compression due to ossification and abnormal signal intensity of the co...

To determine bone mineral density (BMD) in patients with mild ankylosing spondylitis (AS), to establish the prevalence of vertebral fractures and fracture risk in these patients, and to determine the relationship between BMD and vertebral fractures. Sixty-six men with mild AS were studied. BMD of the lumbar spine and femoral neck was measured by du...

The evolution of the multipolar structure of the magnetic field of isolated neutron stars is studied assuming the currents to be confined to the crust. Lower orders ($\le 25$) of multipole are seen to evolve in a manner similar to the dipole suggesting little or no evolution of the expected pulse shape. We also study the multifrequency polarization...

A 45 year old male came with fever, headache, altered sensorium pallor and lower gastrointestinal bleeding. Laboratory investigations confirmed typhoid fever. Magnetic resonance imaging (MRI) was suggestive of acute disseminated encephalomyelitis.

To determine the androgen status of men with mild ankylosing spondylitis (AS) and to evaluate the relationship of sex hormones with bone mineral density (BMD) and vertebral fractures. Fifty-six male patients with mild AS were studied. All patients had BMD measured by dual x-ray absorptiometry (DXA) of the lumbar spine and hip, and had radiographs o...

To determine the relationship of biochemical markers of bone metabolism in patients with mild ankylosing spondylitis (AS) with disease activity, bone mineral density (BMD), and vertebral fractures. A total of 56 male patients with mild AS were studied. All patients had BMD measured by dual x-ray absorptiometry of the lumbar spine and hip and radiog...

Out of 195 cases of Takayasu's arteritis who presented in our institute between January 1988 and December 1997, 12 (5.58%) had dilated cardiomyopathy. Age of these patients ranged from 10 to 30 years (17.25 +/- 5.30 years) and male-female ratio was 1:11. All the cases had cardiovascular system features (dyspnoea, oedema, palpitation, angina, etc. b...

Characterizing the shape and evolution of pulsar radio emission beams is important for understanding the observed emission. The various attempts by earlier workers investigating beam shapes have resulted in widely different conclusions. Using a carefully selected subset of the recently published multifrequency polarimetry observations of 300 radio...

The evolution of the multipolar structure of the magnetic field of isolated neutron stars is studied assuming the currents to be confined to the crust. We find that, except for multipoles of very high order (l≳25), the evolution is similar to that of a dipole. Therefore no significant evolution is expected in the pulse shape of isolated radio pulsa...

New measurements of scattering delay for 27 pulsars at 327 MHz are presented. These measurements significantly improve on the available set of measurements for pulsars with dispersion measures in the range 100 to 250 pc cm^-3. These measurements also sample an important section of the Galactic volume which should render better modelling of the elec...

Three hundred and forty-one young hypertensives in the age group of 18-30 years were evaluated over a 7-year period. Essential hypertension constituted the single largest group (35.8%). Renal pathology was the most common cause of secondary hypertension (26.4%). Congenital coarctation of the aorta and endocrine causes accounted for 14.1 percent and...

The following case report describes a patient who is known to have both fibrous dysplasia and Paget's disease, and traces his history over more than 50 years. The similarities and differences between the two conditions and their relative importance at the various stages of the history are discussed.

We evaluated quantitative differences in adherence of Acanthamoeba castellanii trophozoites and cysts to new unworn contact lenses as a function of contact lens type and duration of exposure. Daily wear soft (polymacon), disposable soft (etafilcon A), rigid gas permeable (RGP) (siloxane acrylate), and polymethylmethacrylate (PMMA) contact lenses we...

The clinical and histological features of‘mechanic's hands' are described in a patient with polymyositis characterized serologically b6y antibodies to histidyl t RNA synthetase (Jo-1). Although distinctive cutaneous lesions have only recently been associated with the ‘anti-synthetase syndrome’. It is becoming apparent that recognition of subsets wi...

Sixty patients aged 5-16 years underwent implantation of permanent pacemaker and were followed up for 3-11 years. All these patients presented with syncope or symptomatic bradyarrhythmias; two also had congestive cardiac failure in addition, which was ameliorated by pacemaker implantation. A majority of the patients (48) had congenital complete hea...

This paper deals with the stabilizing effect of diffusion on a system of a living resource supporting two noncompeting predators. It is shown that while the three species mathematical model without diffusion is unstable, the model with diffusion is asymptotically stable provided the diffusion coefficient of the resource exceeds a certain threshold...

This paper deals with the permanent coexistence and global stability of a simple Lotka-Volterra type mathematical model of a living resource supporting two competing predators. The result include the sufficient condition for uniform persistence (or permanence) of the system. It is also shown that the system is globally asymptotically stable.

Permanence and Hopf-type small-amplitude oscillations of a model of a nonspatial detritus-based micro-organism and its invertebrate predator is analytically discussed. The permanence of the model is shown to operate uniformly in a certain parameter region even though its stability characteristics may be topologically different. It is found that the...

The author shows how an economic analysis can help in the planning of mining investments and minimize the financial risks associated with the opening of new mines, expansion of existing mining capacity, replacement of worn-out or obsolete equipment, and the acquisition of operating mines through consolidation. The relationship between profits and t...

Combining dispersion measures, distances and emission measures for 157 pulsars lying above ‖ b ‖> 5° and between 60° < l < 360° we find the mean volume filling factor (f̄ v ) of the diffused ionized gas in the Milky Way. This filling factor is inversely related to the mean electron density (n̄ c) in the clouds, f̄ v = (0.0184 ± 0.0014) n̄ c −1.07±...

Microwave spectra of the following isotopic species of nitrosyl bromide have been measured and assigned : 14N16O79Br, 14N16O81Br, 15N16O79Br and 15N16O81Br. Rotational constants are reported and have been used to evaluate the structure in a number of ways. The following structure is reported: rN–Br= 2.140±0.002 Å, rN–O= 1.146±0.010 Å and ∠ONBr = 11...