Temperature dependence of CO2 solubility in high pressure quenched glasses of diopside composition

The temperature dependence of carbon dioxide solubility in glasses of diopside composition, quenched from 20 kbar, has been investigated using a combination of high-temperature mass spectrometry and Raman spectroscopy.CO₂-charged diopside glasses were synthesized in a piston-cylinder apparatus. Because of diffusion of hydrogen through the platinum capsules, significant amounts of H₂O, CH₄ and CO were detected along with CO: in the diopside glasses. All three carbon species show a bimodal release pattern in the mass pyrograms. The CO₂ solubility shows a linear and negative temperature dependence. We do not observe any maxima in the solubility curve as was reported previously (Mysen and virgo, 1980a).None of the additional bands observed in Raman spectra of CO₂-charged diopside glasses compared to those in the spectrum of diopside glass can be assigned to molecular CO₂. These bands are caused by CO^?2₃ ions and indicate that the physical solubility of molecular carbon dioxide is negligible. The bimodal release pattern observed for CO₂ in the mass pyrograms, is consistent with the Raman data which strongly suggests that CO^?2₃ ions are present in at least two distinct sites in the glass.     

On unsteady flow of a viscous fluid between two parallel plates under variable surface charges

Summary The equations of electricity and the equations of hydrodynamics have been used to solve the problem of unsteady flow of a viscous fluid under variable surface charges.     

Electromagnetic response of a covered inhomogeneous permeable conductor in time domain

Summary An initial value induction problem has been solved to examine the response of a massive sulphide ore body under conditions of common occurence. The generalized expression for the induced field due to a step-function dipolar field in the presence of a non-uniformly conducting permeable sphere surrounded by a finitely resistive overburden has been derived. Two cases, when the concentric shell is (i) insulated from and (ii) in galvanic contact with the inner core, have been considered. The analytical results are in computable form to yield the decay-characteristics for application in geoelectromagnetics. Particular cases of the problem treated by the other investigators are discussed.N.G.R.I. Contribution No. 71-234     

Results of airborne magnetometer profile from offshore Mangalore to offshore Madras (India) along the 13th degree parallel

Summary A study is made of an airborne magnetometer profile from 130 km offshore Mangalore to 60 km offshore Madras approximately along the 13th degree parallel obtained in May 1967 by the National Geophysical Research Institute. The total length of the profile is about 770 km. A Bouguer gravity anomaly profile along same traverse over the land section has been also studied along with the magnetic profile.Eight major anomalies on the magnetic profile were chosen for depth calculations. Depths of the magnetic bodies were determined by elementary approximation method ofSmellie. It is found that in most of the cases the sources of the magnetic anomalies lie between 5 to 20 km (approximately). Only one anomaly yielded a depth of 2.7 km for its source. These anomalies are accounted for in terms of possible basic intrusions, faults, zones of weakness and ridge-like structures in deeper Crustal levels.N.G.R.I. Contribution Number 131.     

Some statistical properties of certain geophysical transport equations

Summary A previously noted analogy between certain transport equations and the heat conductivity equation is further analyzed. It is shown thatPrigogine's nonequilibrium formalism can be directly applied to statistical processes where there is a non-negative constant of the motion. If the total mass (of contaminant, tracer etc.) contained in a fluctuating system is taken as such a constant of the motion, a statistical theory of the corresponding transport process is obtained.     

Electron impact polarization of Lα-radiations from hydrogen-like ions

The Oppenheimer-Penny theory, as developed by Percival and Seaton (1958), is applied to calculate the polarization of L radiations from hydrogen-like ions when the impact electrons are distributed such that their probability is more in the regions close to the magnetic field. The degrees of polarization are averaged over the energy of non-thermal electrons generated during the initial phase of solar flares. It is found that the degrees of polarization do not depend on the atomic number of the ion.     

Groundwater study in the Piedmont zone of Mechi Mahananda interfluve in Darjiling district,West Bengal using remote sensing techniques

The Mechi-Mahananda interfluve is a transitional area between the hills and the plains and exhibits a wide range of topographical variations. The drainage system of the area has a close relationship with lithology and landforms. The rivers originating in the hills attain a braiding character and have well developed alluvial fans. Piedmont plain covers a large area and has high ground water potential. The river terraces and flood plains also have high potentialities of ground water targeting. Fluctuation of water table is very high in the upper piedmont plain dependent upon the proximity to the drainage lines.     

The North Sea: co-ordinated sea use management

The purpose of this paper is to consider the sea use management in the North Sea with reference to the re-structuring of the global and European economies; the sectoral activities including maritime transport and strategic issues, fisheries and hydrocarbons, and environment-related industries including waste disposal, recreation, research and conservation. The rapidly developing role of information management and the role of GIS is discussed. An assessment is made of the role of organisations in international agreements, including in particular the new regional marine environment conventions forthe North East Atlantic and the Baltic, national coastal management initiatives, the NorthSea Ministerial Conferences and the European Union, with particular reference to the Common Fisheries Policy.