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  • 1
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary The probability of occurrences of thundery weather over Gauhati airport has been investigated. During the pre-monsoon thunderstorm period, the months of April and May have higher probabilities for the occurrences of thundery weather and the month of March has, on average, medium probabilities. The probability for thundery weather, during the months of March and April, is the highest during 〉18 to 24 h and then decreases successively during 00 to 06 h, 〉12 to 18 h and 〉06 to 12 h in order. The month of May, being the transition season for sharp decrease of nor' westers, is an exception. The months June to September, during monsoon season, have high probabilities for a day being thundery; but the month of October, during which monsoon virtually withdraws, shows decreasing trend in probabilities for successive date-groups. During the whole of the monsoon months, the time-groups 〉12 to 18 h, 〉18 to 24 h, 00 to 06 h and 〉06 to 12 h rank first, second, third and fourth in the order of probability for a day being thundery. In April and May, the probabilities for the occurrences of thundery weather of MLL, LL and VLL groups are higher, but in the month of March, the probabilities for the occurrences of first two groups are higher and the third group has medium probability. During the months June to September, in the monsoon season, the probability for thundery weather of MLL and LL groups are higher but that of VLL group has the medium probability; during the month of October — the last month for monsoon season — MLL and LL have higher and medium probabilities for the occurrences of thundery weather.
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  • 2
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary The best fit curves for upper air mean dry-bulb and dew-point temperatures over Gauhati airport (26°05′N, 91°43′E, 49 metres a.m.s.l.), for the month of April, have been calculated with the equation,x=A+By+Cy 2,y being the log value in mb of the isobaric level under consideration andx, the mean dry-bulb or dew-point temperature as the case may be, at the isobaric level under consideration. The values of constantsA, B andC for morning dry-bulb and dew-point curves come to be −29.54559, −93.65766 and +37.35048 and −118.84791, −31.15503 and +25.63585 respectively and values of these constants for evening curves come to be −35.86214, −94.15694 and +38.61870 and −127.55970, −29.97192 and +26.36538 respectively. These best fit curves help in finding out mean desired temperatures at any isobaric level in forecasting of thunderstorms and hailstorms, at a station, by dry-bulb and dew-point temperature anomaly technique propsed earlier by the authors.
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  • 3
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Equations $$\frac{{\partial \phi k - 1}}{{\partial t}} = 9.8 T*_{k - 1} \frac{{\phi _k }}{{T_k ^2 }}\frac{{\partial T_k }}{{\partial t}}$$ and $$\frac{{\partial \phi _k }}{{\partial t}} = - 9.8 T*_k \frac{{\phi _k }}{{T_k ^2 }}\frac{{\partial T_k }}{{\partial t}}$$ have been derived. These equations reveal that the variation inT k , the temperature of the layer between two isobaric levels, causes variation in the same sense (increasing or decreasing) inφ k-1, the geopotential height of the lower isobaric level and in the opposite sense inφ k , the geopotential height of the upper isobaric level. The former is associated with the bad or fair weather at and above the level while the latter with the radiational or other heating effects in lower layers. The time-section of the geopotential height of an isobaric level has approximately sinusoidal pattern. An increase in the slope of the geopotential height is indicative of incidence of bad weather, whereas decrease of slope corresponds to fair weather at and above the isobaric level under consideration.
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  • 4
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Vertical time-section charts for temperature and dew-point anomalies have been plotted. The temperature anomaly decreasing upwards give convection according to Byers and Braham [1]2). The coincidence of temperature anomalies with central minimum and of dew-point anomalies with central maximum, or of upward decreasing trend in temperature anomalies and upward increasing trend in dewpoint anomalies, correspond to the convection associated with greater moisture influx, thus representing the case of a thunderstorm. The mentioned anomalies have been found to occur in such a way that cells with central maximum are followed by those with central minimum, and vice versa. Thus simultaneous occurrences of upward decreasing anomalies in temperature, i.e. occurrence of cells with central minimum of temperature, and upward increasing anomalies in dew-point, i.e. occurrence of cells with central maximum, can be observed at any station, hence the occurrences of thunderstorms at that station can be predicted. Moreover, the two kinds of anomalies can give the idea (along with that of convection, of coming of the synoptic situation having dry air aloft and moist air below, which is the ideal condition) for the occurrence of a hailstorm (Fawbush andMiller [2]).
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  • 5
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract A comparative study of the number and distribution of chromocentres in interphase nuclei and mean chiasma frequency at diakinesis has been made in three varietal populations of radish (Raphanus sativus L.), “Scarlet Globe”, “Japanese White” and “Chinese White”. The study showed a significant difference between the varietal populations in mean chiasma frequency and number of chromocentres (P〈0.001), indicating that these nuclear characters are genotypically controlled. The correlation analysis revealed a significant negative correlation between chromocentres and chiasma frequency (r= -0.87). It was concluded that an increase in the amount of constitutive heterochromatin, as inferred by chromocentre counts, adversely affects the chiasma frequency and, consequently, genetic recombination in radish.
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  • 6
    ISSN: 1434-4483
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Zusammenfassung Es wurden die Wahrscheinlichkeiten von Gewittern über dem Mohanbari-Flugplatz in Nordost-Indien für die sechs Pentaden jeden Monats und gesondert für die Tagesviertel bestimmt und die Andauer der Gewitter nach fünf Gruppen klassifiziert.
    Notes: Summary Each month has been classified into six pentads and each day into four quarter-days; probable occurrences of thundery weather in each of these ones have been determined over Mohanbari aerodrome (North-east India). The duration of occurrences of thundery weather has been classified into five duration-groups and the probabilities that the thundery weather will belong to each of these groups have been calculated.
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  • 7
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: We have performed Hartree-Fock calculations for simple cubic metallic hydrogen crystals using Bloch functions expanded in plane waves, All integrals were evaluated accurately including exchangeterms. Increasingly larger basis sets were used, and the total Hartree-Fock energy obtained with the maximum number of plane waves (27) was -0.4770 hartrees/atom. This total energy is believed to be within a few millihartress of the Hartree-Fock limit results. The deficiency of a plane-wave expansion to represent the atomic cusps, however, makes it difficult to obtain the exact Hartree-Fock limit with a plane-wave expansion. When the correlation energy (calculated in the random-phase approximation with Hartree-Fock bands and functions as zeroth order states) is added, and upper limit of -0.501 hartrees/atom is found for the total energy of this system. The Fermi surface was found to touch the Brillouin zone boundaries around the X points due to an appreciable depression of the band energies in that part of the Brillouin zone. The equilibrium lattice spacing (a = 2.705 bohrs) was slightly smaller than that obtained earlier with an atomic orbital basis.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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