Reductive alkylation of aromatic amines over copper chromite: Deactivation of catalyst

1115-1117Reaction of aniline with acetone in the presence of hydrogen and copper chromite as catalyst at 140°C and 50 kg/cm2 pressure has been studied with a view to understand the reasons for the rapid deactivation of the catalyst. Poisoning of the surface by the by-products of the reaction is the major cause of deactivation

Generalized Mittag-Leffler Distributions and Processes for Applications in Astrophysics and Time Series Modeling

Geometric generalized Mittag-Leffler distributions having the Laplace transform $\frac{1}{1+\beta\log(1+t^\alpha)},00$ is introduced and its properties are discussed. Autoregressive processes with Mittag-Leffler and geometric generalized Mittag-Leffler marginal distributions are developed. Haubold and Mathai (2000) derived a closed form representation of the fractional kinetic equation and thermonuclear function in terms of Mittag-Leffler function. Saxena et al (2002, 2004a,b) extended the result and derived the solutions of a number of fractional kinetic equations in terms of generalized Mittag-Leffler functions. These results are useful in explaining various fundamental laws of physics. Here we develop first-order autoregressive time series models and the properties are explored. The results have applications in various areas like astrophysics, space sciences, meteorology, financial modeling and reliability modeling.Comment: 12 pages, LaTe

Packages of Practices for Sustainable, Ecofriendly Mariculture (Land-based Saline Aquaculture and Seafarming)

The problems of fast growing human population and protein deficit, particularly in the developing countries continue to exert pressure on the fisheries resources available for exploitation in the wild water bodies. The increasingly limited opportunities in the capture fisheries sector have generated considerable interest in aquaculture

Catch trend of commercial trawl fisheries at Krishnapatnam Port. Nellore district, Andhra Pradesh

Of the five fisheries harbours in the Andhra Pradesh, Visakhapatnam Fisheries Harbour has been classified as major and the harbours at Kakinada (East Godavari district), Bhavanapadu {Srlkakulam district), Nizampatnam (Guntur district) and Krishnapatnam Port (Nellore district) as minor harbours

Assessment of methods of acquiring analyzing, and reporting crop production statistics, volume 4

There are no author-identified significant results in this report

Influence of Thermal Effluents on the Growth Characteristics of Phytoplankton in the Waters of Tuticorin Bay

The paper reports the results of investigations conducted in 1990, on the physico-chemical aspects of Tuticorin Bay waters in relation to the abundance of phytoplankton. Selected species of phytoplankton were experimental1y cultured to study the influence of thermal effluents. For this purpose cultures ,vere raised in media collected from 4 stations. showing different extents of pollution. Four species of nannoplankton, namely. l sochrysis galbana (Haptophyceae), Dicrateria inornata (chrysophyceae), Tetraselmis gracilis (Chloro-phyceae) and Chaetoceros calcitrans (Bacillariophyceae) were grown in the water samples collected from selected stations. The experiments showed stimulatory trend of growth for the first 7-8 days and gradual inhibitory effect on the multiplication in subsequent days. Among them, the phytoflagellates (Jsochrysis, Dicrateria and Tetraselmis)showed good growth in the samples of media collected from locations near to the pollution source. The rate of production of both Tetraselmis and Dicrateria, which are known to exist in the polluted waters, indicated enhanced growth in the Bay waters. The growth of the diatom, Chaetoceros has been found to be uniform except in the sample collected from the point nearest to the source of pollution. Though the long-term effects of these samples have not been studied, the experiments revealed the possible effects of.thermal effiuents on the phytoplankton population in the waters of Tuticorin Bay

Light Metal Matrix Composites - Present Status & Future Strategies

The unique tailorability of the composites to meet the required properties has made them as advanced engineering materials . The continuous fibre reinforced metal matrix composites were developed first . The high cost of the fibre as well as fabrication made them very expensive and hence they are used only in selected critical areas of aerospace and defence . The invention of synthesising discontinuous reinforced metal matrix composites by stir casting initiated in India in the early seventies 1 s a landmark in the history of Metal Matrix Composites (MMC). The initial feasibility studies on making the composites with variety of dispersoids for tailoring new materials possessing special properties with lower cost had kindled interest in many R&D and academic institutions in India in the eighties . Extensive R&D activities were witnessed during this period . The work carried out during this period can broadly be classified into processing methods . structure property correlation , specific property evaluation , prototype component development and evaluation , etc. The expected impact of composite as an exciting engineering material did not take place in the nineties.The industries are still not receptive and their response is lukewann . At present,only selective academic and R&D Institutions in India are pursuing MMC activity on a low profile . Eventhough similar trends in R&D were observed abroad in the developed countries wherein the industrial applications of composites specially in automotive and engineering industries is steadily increasing Indian industries are yet to think of using MMC components . This calls for a renewed concerted and sustaining effort,pooling up the resources and knowledge as well as consortium type approach among Indian R&D and Academic Institutions . The identified areas include generation of data bank on MMC and their properties. pilot plant production facility for demonstration of prototype developments under simulated industrial conditions , bringing down the cost by redesigning the components, etc

Marine Fisheries Policy Brief-1 Kerala

Kerala which has a coastline of 590 km ranks first in marine fish production of India, contributing nearly 25% (5.81 lakh tonnes on average) to the total annual production. The export of marine products from the State earns valuable foreign exchange besides affording innumerable job opportunities in the industry. The population depending on fisheries has steadily increased over the years and stood at 6,02,234 in 2005 (Anon., 2005). Kerala has been in the forefront of absorbing innovative and new technologies in fishing practices, which have led the marine fisheries sector to take a complex structure. The 1980s was an important period in the development of marine fisheries in Kerala. In the first half of the period the motorized sector grew rapidly and became the most important sector yielding the maximum catch in 1988. By that time, ringseine became very popular in exploiting the pelagic resources and replaced the boatseines to a very great extent. Huge size of the new net (450 to 1000 m long) and large number of crew (30 to 50) needed for its operation necessitated larger boats with high capacity outboard engines (3 outboard engines of 40 hp each). This facilitated extension of fishing grounds for the motorized sector. The fishing grounds covered by the mechanised sector also extended by increasing the boat size and fishing effort and efficiency through multi-day fishing during the late 90s