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Search Results: 1 - 10 of 485975 matches for " S. C. Joshi "
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Frobenius splitting and ordinarity
Kirti Joshi,C. S. Rajan
Mathematics , 2001,
Abstract: We examine the relationship between the notion of Frobenius splitting and ordinarity for varieties. We show the following: a) The de Rham-Witt cohomology groups $H^i(X, W({\mathcal O}_X))$ of a smooth projective Frobenius split variety are finitely generated over $W(k)$. b) we provide counterexamples to a question of V. B. Mehta that Frobenius split varieties are ordinary or even Hodge-Witt. c) a Kummer $K3$ surface associated to an Abelian surface is $F$-split (ordinary) if and only if the associated Abelian surface is $F$-split (ordinary). d) for a $K3$-surface defined over a number field, there is a set of primes of density one in some finite extension of the base field, over which the surface acquires ordinary reduction. This paper should be read along with first author's paper `Exotic torsion, Frobenius splitting and the slope spectral sequence' which is also available in this archive.
Refresher Training on Maternal and Child Health for Urban Community Health Volunteers: Assessing Knowledge and Skills
Joshi H S,Joshi M C,Ranjan P,Misra S
Internet Journal of Medical Update - EJOURNAL , 2006,
Abstract: Refresher training is given to the health volunteers/workers for updating and upgrading the knowledge & skills to deliver comprehensive and integrated services and to increase female involvement in the healthcare delivery system and also to develop self-help mechanisms at the community & family level. This study was carried out to understand the effect of Refresher training course on the knowledge and skills of Urban Community Health Volunteers (UCHVs) on Maternal and Child Health (MCH). The course was conducted by the Manipal College of Medical Sciences at the Manipal Teaching Hospital and Manipal School of Nursing, Pokhara, Nepal on seven days during the month of August, September and October' 2005. The Manipal Teaching Hospital is a tertiary care hospital catering for a large population in a hilly area in the western development region of Nepal. The numbers of Urban Community health volunteers were 56. Semi structured questionnaire with precoded closed and open ended questions in Maternal and child health were used before and after the training period. After the completion of the course, there was a significant increase in knowledge and skills of the volunteers (Z value=13.3, p<0.001). The course could be conducted adequately using the material and methodology proposed, but could have been more satisfactory if the time allocated to the exercise and clinical practical sessions were increased. The study also highlighted the need for involving and encouraging health institutions in the private sector for the development of suitable training policy of His Majesty's Government and also in the implementation of national strategies for health for all.
Complex stellar system ESO65SC03: Open cluster or remnant?
Gireesh C. Joshi,Y. C. Joshi,S. Joshi,S. Chowdhury,R. K. Tyagi
Physics , 2015, DOI: 10.1017/pasa.2015.22
Abstract: We present a complete spatial and dynamical study of the poorly populated stellar system ESO65SC03. The radial distribution of the system gives a core and cluster radii of 1.10+/-0.63 arcmin and 5.36+/-0.24 arcmin, respectively. The surface number density profile (SNDP) does not show any clear enhancement of the surface stellar number density between the stars of the system and the field regions. We derive the optimum isochrone solution for a particular grid size in the colour-magnitude diagram (CMD) using the statistical cleaning procedure. Using the statistically cleaned CMDs, we find the distance modulus, (m-M)_0, and reddening, E({B-V}), of the system to be 11.8+/-0.2 mag and 0.45 mag, respectively. The mean proper motion of this system is -5.37+/-0.81 mas/yr and 0.31+/-0.40 in RA and DEC directions, respectively. The mean proper motion of this system is found to be almost similar to the field region. The mass function for the brighter stars is found to be too high for the system to be an open cluster. These combined results place constraints on whether stellar system ESO65SC03 is a possible open star cluster remnant (POCR) or an Asterism. Our understanding is that the ESO65SC03 is in a stage of POCR by loosing their main sequence stars in the dynamic evolution processes.
Basic Parameters of Open Star Clusters DOLIDZE 14 and NGC 110 in Infrared bands
Gireesh C. Joshi,Y. C. Joshi,S. Joshi,R. K. Tyagi
Physics , 2015, DOI: 10.1016/j.newast.2015.04.003
Abstract: The basic physical parameters of a poorly studied open cluster NGC 110 and an unstudied open cluster DOLIDZE 14 are estimated in the present study using the archival PPMXL and WISE catalogues. The radius of both the clusters are estimated by fitting the modified King's empirical model on their stellar density profiles. The other basic parameters of the clusters such as distance, reddening, and age are obtained by visual fitting of the Marigo's solar metallicity isochrone on their IR colour-magnitude diagrams (CMDs). The mean-proper motion of the clusters are estimated through the individual proper motion of probable members identified through the dynamical and statistical methods. The archival catalogues (JHKW1W2) are constructed for both the clusters by compiling the extracted data from the PPMXL and WISE catalogues. The various colour-excesses, such as E(J-H), E(H-K) and E(W1-W2), are estimated using the best fit theoretical isochrone on the (J-H)-H, (H-K)-H and (W1-W2)-H CMDs, respectively. The ratios of various infrared colours of the clusters are obtained through their two-colour diagrams. We also identify the most probable members in these clusters by estimating spatial, kinematic and spatio-kinematic probabilities of stars within the cluster. A correlation between the E(H-K) and E(W1-W2) is also established.
Post harvest fruit rot diseases in mango cv. Kesar
S.C. SATI and R. JOSHI
Indian Phytopathology , 2012,
Abstract: Weekly surveys of microbial rots of mango cv. Kesar were conducted at Moti and Nani markets, Junagadh during May-June of 1990 and 1991. A similar survey was conducted at the food processing unit of Gujarat Agro Industries Corporation Ltd, Junagadh.Over the two years, the incidence of Lasiodiplodia theobromae [Botryodiplodia theobromae] was highest (average 5.2%) followed by Aspergillus niger (4.0%) at the markets. Incidence of all pathogens was higher at the food processing units, with a 22.6% loss due to Botryodiplodia rot and 6.96% incidence of Aspergillus rot.
Global effects in quaternionic quantum field theory
S. P. Brumby,G. C. Joshi
Physics , 1996, DOI: 10.1007/BF02282122
Abstract: We present some striking global consequences of a model quaternionic quantum field theory which is locally complex. We show how making the quaternionic structure a dynamical quantity naturally leads to the prediction of cosmic strings and non-baryonic hot dark matter candidates.
Experimental status of quaternionic quantum mechanics
S. P. Brumby,G. C. Joshi
Physics , 1996, DOI: 10.1016/0960-0779(95)00001-1
Abstract: Analysis of the logical foundations of quantum mechanics indicates the possibility of constructing a theory using quaternionic Hilbert spaces. Whether this mathematical structure reflects reality is a matter for experiment to decide. We review the only direct search for quaternionic quantum mechanics yet carried out and outline a recent proposal by the present authors to look for quaternionic effects in correlated multi-particle systems. We set out how such experiments might distinguish between the several quaternionic models proposed in the literature.
Quantum Dynamics in Regions of Quaternionic Curvature
S. P. Brumby,G. C. Joshi
Physics , 1994,
Abstract: The complex unit appearing in the equations of quantum mechanics is generalised to a quaternionic structure on spacetime, leading to the consideration of complex quantum mechanical particles whose dynamical behaviour is governed by inhomogeneous Dirac and Schr\"{o}dinger equations. Mixing of hyper-complex components of wavefunctions occurs through their interaction with potentials dissipative into the extra quaternionic degrees of freedom. An interferometric experiment is analysed to illustrate the effect.
Star formation along a misaligned bar in the peculiar starburst galaxy Mkn 439
Aparna Chitre,U. C. Joshi,S. Ganesh
Physics , 1999,
Abstract: We report the detection of massive star formation along a bar in the peculiar starburst galaxy Mkn 439. We present optical B, R and H_alpha + [NII] emission line images as well as H band images to show that the signature of the bar becomes progressively weak at longer wavelengths. Moreover, this bar is misaligned with the main body of the galaxy. The peak H_alpha emission does not coincide with the bluest regions seen in the colour maps. We infer that the starburst is young since the stars in the burst have not started influencing the light in the near infrared. There are indications of dust in the inner regions of this galaxy.
Phosphor Converted White Led with Improved CRI  [PDF]
P. J. Yadav, N. D. Meshram, C. P. Joshi, S. V. Moharil
Journal of Applied Mathematics and Physics (JAMP) , 2018, DOI: 10.4236/jamp.2018.64058
Abstract:
Most of the commercial white LED lamps use blue chip coated with yellow emitting phosphor. YAG:Ce3+ phosphor is coated on blue chip to obtain white light. Though this is commercially successful, there are several drawbacks such as “halo effect”, poor colour rendition, etc. In recent years several efforts have been made to improve LED lamp performance. In this paper modifica-tion of YAG:Ce phosphor for improving CRI, by introducing Gd3+, Pr3+ or Tb3+ at Ce3+ site is reported.
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