Beneficiation of Low Grade Wolframite Ore from Degana, Rajasthan

Woframite is one of the principal minerals containing tungsten and is considered as a strategic mineral because of its importance and short supply. It is a tungstate of iron and manganese. Low grade wolframite deposits occur in India at Agargaon, Nagpur, Kalimati, Singhbhum, Chennda-pathar, Bankura, jhirpalla, Ahmedabad, Kadavur and Urura-kanad, Tiruchinapalli and on Rawat hill, near Degana, Jodhpur

Benefication of low grade wolramite ore from Degana, Rajasthan

WOLFRAMITE is one of the principal minerals containing tungsten and is considered as a strategic mineral because of its importance and short supply. It is a tungstate of iron and manganese (Fe, Mn) WO4 and generally occurs in prismatic or tabular crystals having a hardness of about 5 and a specific gravity ranging between 7.2 and 7.5. It is usually black in colour and has a good cleavage which causes it to fracture readily into thin flakes It is fairly magnetic. It usually contains 60'6%,', W03, though theoretically it should contain 76.5% WO3

Larval rearing, spat production and juvenile growth of the blood clam Anadara granosa

The blood clam A d r u gmtwsa spawned in the Shdl6lsh Hatchery Laboratory, Tuf icorin on two occasions. The fertilised eggs measured 50-60~in diameter, morula larvae developed in 3 4h m and the trochophorc stage was reached in 5 hrs. The straigb t hinge stage was attained in 20-26 hrs after fertilimtion and these larvae measured 8 3I~en ah and 65.5~h eight. Advanced umbo stage was reached on day 12 (size 155.3 x 140.5~) and on day 16, majority of the larvae were in pedivcliger stage with an average size of 182.7 x 162.9~. SettIement began on day 16 and majority of the larvae were set on day 18. The growth of the spat in the hatchery is described by the exponential equation L - 0.0002739 D - where L is length in mm and D. days. On day 59, tbe spat attained an average size of 2.42 x 1.70 mm. A total of 8090 spat were produced. During tha nursery rearing in the field, the seed clam attained 20 mm average length in the following 5 months. In India, A.grund~llsecd were grodwdfor the Arst time. The significance of this study forthe mass production of the blood clam seed in the bat~herya nd its relevma to undertake blood clam culture are highlighted

The Indian marine pearls- A culture technique for pearl production

Even though experiments on production of cultured pearls were initiated in India in early 1930's, success was achieved only in the 70's when the free spherical pearls were produced. The Central Marine Fisheries Research Institute (CMFRI), after successfully producing the spherical pearls, has developed a technology to produce the pearl oyster seed by the hatchery method and farming the oysters at sea. Training was imparted on these important technologies to technicians both at national and international levels

Electrolytic preparation of magnesium perchlorate

The electrochemical preparation of magnesium perchlorate from magnesium chlorate employing a platinum anode and a rotating stainless steel cathode is described. The effect of electrolyte con,=en-tration, cathode and anode current densities, pH and temperature of the electrolyte and cathode rotation on current efficiency for the preparation of magnesium perchlorate was studied. A maximum curren t efficiency of 65-72% was achieved. Based on the results obtained on the laboratory scale, a 100A cell was designed, fabricated and operated

Larval rearing and spat production of the great clam, Meretrix meretrix (Linnaeus)

The venerid clam Meretrix meretrix (Linnaeus) was spawned in the laboratory and for the first time the eggs were reared successfully through various stages to spat. Setting was observed on day 7 and day 10 after fertilization and was mostly completed by day 9 and 12 respectively in the two experiments. The clam seed attained an average length of 2.895 mm and height of 2.475 mm on day 75. During the rearing experiments the haptophycean flagellate, hochrysis galbana was given as food. In the light of the results obtained here the thrust areas for standardising the procedures in the hatchery production of the seed of M. meretrix are discussed

Statistical-mechanical theory of ultrasonic absorption in molecular liquids

We 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

Survey of Valinokkam Bay and adjoining area to assess its suitability for integrated sea farming — A report

The Valinokkam Bay and the adjoining area, east of the Bay surveyed, lie between Lat. 9°9' N and 9° 12' N and Long. 78°30'E and 78°42'E . The available information indicates that the bay and the adjoining grounds in the sea are highly productive and suitable for sea farming activities

Differential Production Cross Section of Z Bosons as a Function of Transverse Momentum at sqrt{s}=1.8 TeV

We present a measurement of the transverse momentum distribution of Z bosons produced in ppbar collisions at sqrt{s}=1.8 TeV using data collected by the D0 experiment at the Fermilab Tevatron Collider during 1994--1996. We find good agreement between our data and a current resummation calculation. We also use our data to extract values of the non-perturbative parameters for a particular version of the resummation formalism, obtaining significantly more precise values than previous determinations.Comment: 10 pages, 2 figures, submitted to Phys. Rev. Letters v2 has margin error correcte

Search for Squarks and Gluinos in Events Containing Jets and a Large Imbalance in Transverse Energy

Using data corresponding to an integrated luminosity of 79 pb-1, D0 has searched for events containing multiple jets and large missing transverse energy in pbar-p collisions at sqrt(s)=1.8 TeV at the Fermilab Tevatron collider. Observing no significant excess beyond what is expected from the standard model, we set limits on the masses of squarks and gluinos and on the model parameters m_0 and m_1/2, in the framework of the minimal low-energy supergravity models of supersymmetry. For tan(beta) = 2 and A_0 = 0, with mu < 0, we exclude all models with m_squark < 250 GeV/c^2. For models with equal squark and gluino masses, we exclude m < 260 GeV/c^2.Comment: 10 pages, 3 figures, Submitted to PRL, Fixed typo on page bottom of p. 6 (QCD multijet background is 35.4 events