440 research outputs found
Production of Intermediate or Medium Carbon Ferro Chrome at FACOR
Get PDFFACOR has foreseen the need to develop the intermediate carbon ferro chrome alloy to meet the demands of alloy and stainless steel manufacturers.The paper describes the decarbonisation of liquid high carbon ferro chrome in. an AOD convertor with respect to : (a) Theoretical
aspects and fundamentals, (b) Plant and equipment, (c) Process of making intermediate carbon ferro chromium., (d) Advantages of the processto improve the quality with respect to titanium, silicon, hydrogen and nitrogen in intermediate carbon ferro chromium
Isotope shift studies of the ultra-violet and visible bands of P<SUP>16</SUP>O and P<SUP>18</SUP>O
Get PDFThe spectra of P16O and P18O were excited in sealed discharge tubes containing neon (2-3 mm. pressure), oxygen gas enriched to 65 per cent. of 18O and trace amounts of phosphorus vapour and photographed on a 3 m. grating spectrograph at a dispersion of 2.5 Å/mm. Isotope shift studies in the β-bands confirmed the earlier vibrational scheme of Curryet al. and showed conclusively that the red as well as the violet degraded bands belonged to the same β-system. The present studies of isotope shifts also confirmed the vibrational assignments of the extensive ultraviolet bands involving the 2∑--X2Π transition and the γ-bands (A2∑+-X2Π). In the case of the visible bands, they provided evidence for the first time that the bands at 5585Å, 5962Å and 6385Å belonged to one system and involved 0-0, 0–1 and 0–2 transitions respectively
The β- and γ-band systems of <SUP>14</SUP>NS and <SUP>15</SUP>NS
Get PDFThe spectra of 14NS and 15NS molecules are obtained in a 2450 mc./s. microwave oscillator discharge. Vibrational assignments of the β- and γ-systems are studied in more detail. Several hitherto unrecorded bands are satisfactorily explained as belonging to higher v', v" levels in the Deslandres schemes of both β- and γ-systems. The observed isotope shifts (14NS-15NS) provide confirmatory evidence for the proposed vibrational analysis. In the case of the γ-system, the v'=2 level of the upper state appears to be strongly perturbed showing a shift of about 38 cm.−1 from the expected position. In the β-system, the isotopic shifts in the band-heads involving the v'=0 and 1 levels of the 2Δ5/2 of the upper state show small deviations from expected values. The reality of these small deviations is established beyond doubt by the occurrence of the effect on the 0–0 sub-band which exhibits the isotopic head in a wavelength direction opposite to the expected one
Rotational analysis of the 0-0 band of the A <SUP>3</SUP>Π<SUB>inv</SUB>-X<SUP>3</SUP>Π<SUP>-</SUP> system of ND
Get PDFThe 0-0 band of the A 3Πinv-X 3∑- system of ND was excited in an electrodeless microwave oscillator (2450 Mc./s.) discharge and photographed on a 6·6 meter concave grating spectrograph in the second order at a dispersion of 0·56 A/mm. Twenty-five out of the predicted twenty-seven branches have been identified in the rotational structure of the 0-0 band. From a rotational analysis, the following rotational constants have been determined: (i)X 3 ∑ - state- B0∏(cm.−1) D0∏(cm.−1) (2λ + ϒ) (cm.−1) 8.7757 4.68 × 10-4 −1.8356. (ii)A 3 ∏ inv state - B0∏(cm.−1) D0'(cm.-1) A(cm.-1) C0'(cm.-1) D2'(cm.−1) V00'(cm.−1) 8.7688 5.02 × 10-4 -31.89 -1.40 +0.0118 29799.
Reinvestigation of the second negative (A<SUP>2</SUP>Π<SUB>u</SUB>-X<SUP>2</SUP>Π<SUB>g</SUB>) band system of O<SUB>2</SUB><SUP>+</SUP>
Get PDFThe A2Πu state of O2+ was earlier established as an inverted state contrary to previous assumptions. The rotational analysis of a few more bands of the A-X system of O2+ has now been completed. These studies show that the spin-orbit coupling constant A in the A2Πu state gradually varies with the vibrational quantum number ν and is found to be positive for ν≥6. It has also been observed that the spia-rotation interaction is not negligible in the A 2 Πu state. The spin splitting constant γ is reported for various vibrational levels of this electronic state
Rotational analysis of 2620 Å and 2760 Å bands of <SUP>32</SUP>S<SUP>34</SUP>S
Get PDFRotational analysis of bands of 32S34S at 2620 Å and 2760 Å has been made, which confirms the earlier vibrational assignment of these bands
On the widths of K levels of heavy elements
Get PDFThe ratios of the widths of K levels of heavy elements with atomic number 70 to 92 have been calculated with relativistic wave functions, retardation, screening and field theoretical corrections to relativistic energy. The calculated values have been compared with the available observed data and good agreement has been obtained
Emission spectrum of PrO
Get PDFThe bands of PrO at 8488.95 A and 7986.44 A of system I and at 7662.85 A of system III have been photographed on 6.6 meter concave grating spectrograph at a dispersion of 1.2 A/mm and their rotational structure analysed. They are assigned transitions from v'=0 and 1 levels of A2 Δ5/2 and v'=0 level of B2 Δ5/2 to a common v"=0 level of the ground, X2 Π3/2 state
Biology of the Great Clam, Meretrix meretrix in the Korampallam Creek, Tuticorin
Get PDFIn the great clam Meretrix meretrtx spawning period is prolonged and the reproductive cycle is biannual
in January-April and June-October with peak spawning activity in January-February and September.
The proportion of males to females is not significantly different at 5 % probability from the theoretical
1:1 ratio. The condition index, expressed as percentage of wet flesh weight in total weight varied
from 7.6 to 16.1 with an average of 12.1. The parameters of the Von Bertalanffy growth equation in M.
meretrix0X6 Loo =99.1 mm, K •= 0.3221 per year and t = -0.0745 year. The life-span is estimated at
7.8 years. The various dimensional and length-weight relationships are given. Also the environmental
conditions of the clam bed are described
Statistical-mechanical theory of ultrasonic absorption in molecular liquids
Full text linkWe present results of theoretical description of ultrasonic phenomena in
molecular liquids. In particular, we are interested in the development of
microscopical, i.e., statistical-mechanical framework capable to explain the
long living puzzle of the excess ultrasonic absorption in liquids. Typically,
ultrasonic wave in a liquid can be generated by applying the periodically
alternating external pressure with the angular frequency that corresponds to
the ultrasound. If the perturbation introduced by such process is weak - its
statistical-mechanical treatment can be done with the use of the linear
response theory. We treat the liquid as a system of interacting sites, so that
all the response/aftereffect functions as well as the energy dissipation and
generalized (wave-vector and frequency dependent) ultrasonic absorption
coefficient are obtained in terms of familiar site-site static and time
correlation functions such as static structure factors or intermediate
scattering functions. To express the site-site intermediate scattering
functions we refer to the site-site memory equations in the mode-coupling
approximation for the first-order memory kernels, while equilibrium properties
such as site-site static structure factors, direct and total correlation
functions are deduced from the integral equation theory of molecular liquids
known as RISM or one of its generalizations. All the formalism is phrased in a
general manner, hence the obtained results are expected to work for arbitrary
type of molecular liquid including simple, ionic, polar, and non-polar liquids.Comment: 14 pages, 1 eps-figure, RevTeX4-forma
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