839 research outputs found
Recovery of Iron Values from Slimes and Dewatering of the Concentrate
During crushing and wet processing of iron ore on an average 15- 18% slimes (-100 mesh) are produced in the iron ore mines of Nationa Mineral Development Corporation (NMDC). About 50 to 65% by weight of slimes can be rec- overed and upgraded to +64% Fe by process of hydrocycloning. By the process of wet high intensity
magnetic separation, the magnetic concentrate assaying +65% Fe with similar recovery can be achieved. Dewatering of hydrocyclone underflow and magnetic concentrate can be carried out by slow speed spiral classification. The classifier sand contains about 18 to 20% moisture. During the process ofdewatering the grade of slow speed classifier sand gets improved further. The concentrate
obtained by hydrocyclone meets the specifications for blending with normal classifier sand for sinter making. The magnetic concentrate obtained by WHIMS meet the DRJ pellet grade specification or for alternative method of iron making. There are difficulties for operation
ofthickenerfor water recovery directly form classifier overflow due to higher solid content and fastersettling rate. After removal of major portion of ultrafines from slimes as concentrate, the thickener operation becomes smooth and troublefree. On an average 70 to 75% of input water can be recovered by thickener
Debbie, the Debate Bot of the Future
Chatbots are a rapidly expanding application of dialogue systems with
companies switching to bot services for customer support, and new applications
for users interested in casual conversation. One style of casual conversation
is argument, many people love nothing more than a good argument. Moreover,
there are a number of existing corpora of argumentative dialogues, annotated
for agreement and disagreement, stance, sarcasm and argument quality. This
paper introduces Debbie, a novel arguing bot, that selects arguments from
conversational corpora, and aims to use them appropriately in context. We
present an initial working prototype of Debbie, with some preliminary
evaluation and describe future work.Comment: IWSDS 201
Effect of Thermal Annealing on Boron Diffusion, Micro-structural, Electrical and Magnetic properties of Laser Ablated CoFeB Thin Films
We report on Boron diffusion and subsequent crystallization of
CoFeB (CoFeB) thin films on SiO/Si(001) substrate
using pulsed laser deposition. Secondary ion mass spectroscopy reveals Boron
diffusion at the interface in both amorphous and crystalline phase of CoFeB.
High-resolution transmission electron microscopy reveals a small fraction of
nano-crystallites embedded in the amorphous matrix of CoFeB. However, annealing
at 400C results in crystallization of CoFe with \textit{bcc} structure
along (110) orientation. As-deposited films are non-metallic in nature with the
coercivity (H) of 5Oe while the films annealed at 400C are metallic
with a H of 135Oe.Comment: 16 pages, 6 figure
Effect of microstructure on the high temperature strength of nitride bonded silicon carbide composite
Four compositions of nitride bonded SiC were fabricated with varying particle size of SiC of ~ 9.67, ~ 13.79, ~ 60 μ and their mixture with Si of ~ 4.83 μ particle size. The green density and hence the open porosity of the shapes were varied between 1.83 to 2.09 g/cc and 33.3 to
26.8 vol.%, respectively. The effect of these parameters on room temperature and high temperature strength of the composite up to 1300°C in ambient condition were studied. The high temperature flexural strength of the composite of all compositions increased at 1200 and 1300°C because of oxidation of Si3N4 phase and blunting crack front. Formation of Si3N4 whisker was also observed. The strength of the mixture composition was
maximum
Nanomagnetics with lasers
Both liquid and vapour phase pulsed laser deposition (PLD) techniques have been used to synthesize nanophase magnetic alloys of CoPt. While the liquid route results in soft phase (disordered fcc) nanoparticles of CoPt near equiatomic composition dispersed in a surfactant-polymer matrix, the conventional vapour phase PLD allows growth of high coercivity nanoscale structures of CoPt on (001) SrTiO3. The magnetization, M(T), dynamics of the colloidal particles is examined. Two distinct particle distributions are established from analysis of M(T) data, in conformity with results of electron microscopy. In vapour deposited films at low growth rate (~0.4 Å/s), morphology changes from a self-similar fractal to nanodots as the deposition temperature is raised from 700-800 °C. The large lattice mismatch between (001) SrTiO3 and the ac/bc plane of L10 ordered phase imparts tensile strain to the films whose morphological manifestations can be suppressed at high growth rates
Effect of Chitosan Coating Containing Active Agents on Microbial Growth, Rancidity and Moisture Loss of Meatball During Storage
Edible coatings based on chitosan were applied on meatball product in order to preserve quality during storages atambient and refrigeration temperatures. To improve its efficacy, chitosan coatings were incorporated with garlic oil0.2%, potassium sorbate 0.1 % and nisin 51,000 IU. The qualities of meatball assessed were total microbial growth, TBA value and percentage of moisture loss. All chitosan coatings suppressed microbial growth in meatball and strong- ly revealed when stored at refrigeration temperature. Incorporating garlic oil 0.2% into chitosan coating resulted in a greater reduction of rancidity level in meatball for both storages. Moisture loss of meatball was significantly reduced by all chitosan coatings and obviously shown when stored at refrigeration temperature
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