Genetical and cytological studies in the genus Solanum

The present study is concerned primarily with the behaviour of the chromosomes and their secondary associations at meiosis in six "diploid" species with a view to determine the much discussed basic number in the potatoes. So far investigation of this type has dealt only with the commercial varieties of Solarium tuberosum L., (Ellison l935) and its "diploid and triploid representatives" (M1ntzing 1933), on the basis of the recent interpretation of secondary association of chromosomes. Special attention has also been given here to two interspecific hybrids to determine the homology of their chromosomes

Possible Use of Light Alloys on Indian Railways

THE resources of the raw materials from which aluminium and magnesium are produced, are so abundant and widespread in India that one can hardly visualise conditions in which the users will at any time have difficulty in obtaining their full requirements, if these are fully exploited. This free availability in a world of shortages has, in itself, led numbers of manufacturers to abandon traditional materials like steel, copper, lead, zinc, etc. in favour of light alloys ; and many who were thus first attracted will never wish to forego the advantages they have found in their use. Nevertheless Our main interest should be to further the development of light alloys in their natural and proper field--the field in which these materials stand supreme by reason of their unique characteristics and availability in India

Indigenous substitution of import ed materials on Indian Railways

THE psychology of import substitution is based on the concept of dispensing with as much import as poss- ible by providing alternative indigenous resources. In a developing country like India, it is essential to stress on research , development and trials through different research laboratories/Institutes by suggesting substitutes of imported materials for the avoidance of use or conservation of the imported materials in our country, particularly in the emergency which has high-lighted the necessity for intensifying efforts in this direction

Use of different glazes in frozen oil sardines

This paper reports on the relationship between the seasonal variations in the oil content of the Indian oil sardines (Sardinella longiceps) and their frozen storage life at -l8°C and on the use of various chemicals and coating materials to extent their storage life. It is observed that there is an inverse relationship between the oil content and the frozen storage life- oil content varying from 10.33 to 42.43% (MFB) and storage life from 2 to 5 months. Extension of storage life is achieved by dipping in hydroquinone solution prior to freezing or by coating with agar after freezing. Data on changes in peroxide value, free fatty acids, moisture, drip and organoleptic characteristics during frozen storage are presented

Role of Thermomechanical Treatments on Mechanical Prope-rties, Microstrucures and Corrosion Properties of Micro-alloyed Steels

The paper deals with the developments in HSLA in general and the effect of thermomechanical processing on mecha-nical properties and corrosion in particular. The effect of micro additions on the properties are also dealt with. It has been pointed out that there is tremendous potential for HSLA for ship building, offshore structures, auto-bodies and many other engineering applications

Quantum Communication in 6G Satellite Networks: Entanglement Distribution Across Changing Topologies

As LEO/VLEO satellites offer many attractive features, such as low transmission delay, they are expected to be an integral part of 6G. Global entanglement distribution over LEO and VLEO satellites network must reckon with satellite movement over time. Current studies do not fully capture the dynamic nature of satellite constellations. We model a dynamic LEO/VLEO satellite network as a time-varying graph and construct a sequence of static graphs to represent a dynamic network. We study the entanglement distribution problem between a set of source-destination node pairs in this dynamic network utilizing Multi-commodity Flow (MCF). Solving MCF over a sequence of graphs independently for each graph may produce a completely different set of paths. Changing the set of paths every time the graph topology changes may involve a significant amount of overhead, as an established set of paths must be taken down and a new set of paths established. We propose a technique that will avoid this overhead by computing only one set of paths P to be used over all the graphs in the sequence. The degraded performance offered by P may be viewed as the cost of using P. The benefit of using P is the overhead cost of path switching that can be avoided. We provide a cost-benefit analysis in a LEO/VLEO constellation for entanglement distribution between multiple source-destination pairs. Our extensive experimentation shows that a significant amount of savings in overhead can be achieved if one is willing to accept a slightly degraded performance

Prospects for the Detection of the Deep Solar Meridional Circulation

We perform helioseismic holography to assess the noise in p-mode travel-time shifts which would form the basis of inferences of large-scale flows throughout the solar convection zone. We also derive the expected travel times from a parameterized return (equatorward) flow component of the meridional circulation at the base of the convection zone from forward models under the assumption of the ray and Born approximations. From estimates of the signal-to-noise ratio for measurements focused near the base of the convection zone, we conclude that the helioseismic detection of the deep meridional flow including the return component may not be possible using data spanning an interval less than a solar cycle