The dependence of facula-photosphere contrast in molecular lines on dissociation energy     

M. C. Pande  V. P. Gaur  B. M. Tripathi 《Solar physics》1969,7(3):370-376

Assuming local thermodynamic equilibrium and the same relative abundances to prevail both in photosphere and faculae, the concentration-optical depth curves for molecules CH, NH, OH, C₂, CN and CO have been obtained for the four combinations of two photospheric and two facular models and the relative excesses of these molecules in the photosphere over those in faculae have been calculated. The change of photospheric model significantly affects the relationship, for a given facular model, between and D ₀, the dissociation energy of the molecule concerned. Besides, the average depth of formation in the facular models and photospheric models shows a relationship with D ₀.  相似文献   

Biochemical‐genetic variation in a wild and a cultured population of the greenshell mussel,Perna canaliculus     

J. P. A. Gardner  R. F. Eyles  A. Pande 《新西兰海洋与淡水研究杂志》2013,47(4):435-441

A wild and a cultured greenshell mussel (Perna canaliculus) population were compared for biochemical genetic variation at seven polymorphic and four monomorphic allozyme loci. Significant heterozygote deficiencies were observed for all polymorphic loci (La—1, La—2, Lap, Lgg—1, Lgg— 2, Pgi, and Pgm) for both populations (except the Pgi locus of the wild mussel population). Genotypic disequilibrium was calculated for both populations: genotypic frequencies were significantly non‐random at three pairs of loci among the wild mussels, and significantly non‐random at three different pairs of loci among the cultured mussels. All six pairs of loci which exhibited significant genotypic disequilibrium involved amino‐peptidases, suggesting that these loci form a linkage group, and that neither the Pgi nor the Pgm loci are associated with this group. Exact tests for population differentiation based upon population‐specific allele distributions indicated that four of the polymorphic loci were significantly heterogeneous among the two populations, whereas the remaining three polymorphic loci were not. Based upon the private allele system, the number of migrants (N _m) between the populations was estimated to be 2.009, which, according to the private allele system, represents a high level of gene flow. These findings are discussed with regard to the population biology and genetic structure of this species.  相似文献   

A LOOK AHEAD     

Bimal Kanti Paul 《Geographical review》2013,103(1):iii-iv

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Parametric excitation of a high altitude gravity gradient satellite     

K. C. Pande 《Celestial Mechanics and Dynamical Astronomy》1983,29(2):101-106

Attitude dynamics of a gravity oriented satellite in the presence of solar radiation pressure is examined. It is shown that even with a small offset between the satellite center of mass and center of pressure, significant pointing errors may result from the parametric excitation of the attitude motion by the radiation pressure. The phenomenon is illustrated through the analysis of a simple configuration involving a spherical shaped satellite possessing a nonspherical but axisymmetric mass distribution.  相似文献   

Differential rotation of coronal holes     

Rajendra N. Shelke  M. C. Pande 《Solar physics》1985,95(1):193-197

Using KPNO helium 10830 Å synoptic charts of Carrington rotations 1716 through 1739, and by assembling a time sequence representing single latitude zone, rotational properties of coronal holes for five zones of latitudes (±10°, ±20° – ±40°, and ±40° – ±60°) have been examined. It seems that the rotation period of coronal holes is a function of latitude, thus reflecting differential rotation of coronal holes.  相似文献   

(A-X) system of SiO in sunspots     

G. C. Joshi  L. M. Punetha  M. C. Pande 《Solar physics》1979,62(1):77-82

The calculated equivalent widths of some lines of SiO in the umbral spectrum suggest that strong lines of Si²⁸O¹⁶, Si²⁹O¹⁶ and Si³⁰O¹⁶ may be present in the sunspot ultraviolet spectrum. We also find that between 37 000 and 47 000 cm^–1 the quasi-continuous absorption of SiO dominates all other absorptions.  相似文献   

Molecules in the solar photosphere     

M. C. Pande  V. P. Gaur  B. M. Tripathi 《Solar physics》1969,7(1):17-21

A consideration of the dissociation equilibrium of diatomic molecules in the Utrecht Reference Photosphere leads us to conclude that SH, SiO, CS, HF and HCl may show up in enough concentrations in the solar atmosphere. The number above photosphere for these molecules is comparable with or more than that of MgH.  相似文献   

A study of massive classical polytropes in general relativity     

S. C. Pandey  M. C. Durgapal  A. K. Pande 《Astrophysics and Space Science》1989,159(2):203-218

A detailed study of classical polytropes in general relativity has been presented for _O ((dP/dE)_O) 1.0 and _O((P/E _O)_O. The behaviour of various structural parameters with _O/_O, _O and _O are the values ofP/E and dP/dE at the centre) has been studied. The most important result of this study is the fact the qualitative behaviour of all the structural parameters depends only on the value of µ_O for the various assigned _O values. The maximum value of surface red shift occurs when µ_O=0.6 and for _O=1.0 it equals 0.618. These structures are gravitationally bound for µ_O0.8 and most so for µ_O=0.4. The maximum value of binding coefficient comes out to be 0.181 when _O=1.0. These structures have been used to model neutron stars. The maximum mass of neutron star based upon such a model comes out to be 2.55M (for µ_O=0.4 and _O=1.0) and maximum size comes out to be 15.0 km (for µ_O=0.2 and _O=1.0). It is also seen that the structures are pulsationally stable for µ0.6.  相似文献   

Physically realizable relativistic stellar structures     

M. C. Durgapal  A. K. Pande  R. S. Phuloria 《Astrophysics and Space Science》1984,102(1):49-66

Relativistic stellar structures can be obtained both analytically and by computation, but all these models do not stand the tests of physical reality. It is shown that for a physically reasonable solution d/dr -r and d(e ^v /dr r near the centre, d(P/)/dr<-0 and (dP/d)>-(P/). If we change the variabler tox=Cr ², whereC is a constant, the field equations are reduced to a form which is easier to solve. A new set of exact solutions is obtained by consideringe ^v (1-x) ⁿ . Also, a method has been given to obtain generalized solution.It is shown that the solution discussed by Durgapal and Rawat (1980) is the only exact solution which in its most generalized form for a given density distribution stands all the tests of physical reality and for which both (P/) and (dP/d) decrase with increasing value ofr.Neutron star model is proposed by assuming >-2×10¹⁴g cm^–3. Two specific cases are considered, viz.,P<-1/3 and dP/d<-1, respectively. The structures are found to be bound and stable under radial perturbations. The models have been studied for slow rotation and the mass of the Crab pulsar has been estimated for different mechanisms.  相似文献   

Use of aerial photo-interpretation techniques for land evaluation of a part of Bolangir district,Orissa     

L. M. Pande  H. S. Iyer  K. Venkataramaiah 《Journal of the Indian Society of Remote Sensing》1983,11(2):11-17

The land evaluation has been of paramount importance for the planned development and resource utilization of an area, specially for locating better potential zones for increasing agricultural production. Large areas in the country are yet to be evaluated based on their productivity and potentiality. A case study was undertaken in a part of Bolangir district of Orissa, by using small scale aerial photographs.  相似文献