Washing studies with a limestone sample for reduction of insolubles: a case study

The paper deals with the washing studies conducted with a limestone sample received from Rourkela Steel Plant with a view to reduce the insolubles. The sample analysed 14.88% insolubles and it was required to reduce the same to below 12% level. As the sample contained some amount of clay both in the fines and coating the lumps, it was decided to conduct washing after crushing the sample to the desired size. Bench scale washing studies indicated that, bulk of the clayey matter could be removed. As the insolubles content of the coarser lumps was quite low, pilot plant scale washing studies were conducted both with -50 mm and -25 mm material separately. Results indicated that in both the cases, the insolubles could be reduced to below 12% level with a marginal loss of CaO values

Towards a synthesis of C<SUB>3</SUB>-tribenzohemifullerene, a C<SUB>42</SUB>H<SUB>18</SUB> fragment of [60]fullerene

A short, simple synthesis of C3-trinaphthotriphenylene 6, C42H24, from readily available precursors involving threefold Wittig reactions and threefold oxidative photocyclizations is reported; flash vacuum pyrolysis of 6 in the quest for C3-tribenzohemifullerene 5, C42H18, has so far led only to the formation of monobridged product 12, C42H22

Beneficiation studies on reject dump magnesite sample from Talur Magnesite Mines, Karnataka

Flotation studies on reject dump magnesite sample were conducted using oleic acid emulsion as collector and sodium silicate as depressant. The representative sample assayed SiO, 6.1 %, MgO 41.85%, CaO 2.25% and Fe2O3 1.2%. Mineralogical studies showed that gangue minerals were mostly quartz liberated at grind below 208µ except for serpentine which needs a still finer grind of 107µ Flotation studies in batch scale (I kg batch) indicated that a concentrate analysing 2.02% silica with a yield of 58.5% could he obtained by roughing followed by one cleaning while by adding two more cleaning stages, a concentrate with a silica content of 0.9% with a yield of 32.0% could be produce

A model for bidirectional traffic of cytoskeletal motors

We introduce a stochastic lattice gas model including two particle species and two parallel lanes. One lane with exclusion interaction and directed motion and the other lane without exclusion and unbiased diffusion, mimicking a micotubule filament and the surrounding solution. For a high binding affinity to the filament, jam-like situations dominate the system's behaviour. The fundamental process of position exchange of two particles is approximated. In the case of a many-particle system, we were able to identify a regime in which the system is rather homogenous presenting only small accumulations of particles and a regime in which an important fraction of all particles accumulates in the same cluster. Numerical data proposes that this cluster formation will occur at all densities for large system sizes. Coupling of several filaments leads to an enhanced cluster formation compared to the uncoupled system, suggesting that efficient bidirectional transport on one-dimensional filaments relies on long-ranged interactions and track formation.Comment: 20 pages, 9 figure

Grain Yield Stability of Early Maize Genotypes

The objective of this study was to estimate grain yield stability of early maize genotypes. Five early maize genotypes namely Pool-17, Arun1EV, Arun-4, Arun-2 and Farmer's variety were evaluated using Randomized Complete Block Design along with three replications at four different locations namely Rampur, Rajahar, Pakhribas and Kabre districts of Nepal during summer seasons of three consecutive years from 2010 to 2012 under farmer's fields. Genotype and genotype × environment (GGE) biplot was used to identify superior genotype for grain yield and stability pattern. The genotypes Arun-1 EV and Arun-4 were better adapted for Kabre and Pakhribas where as pool-17 for Rajahar environments. The overall findings showed that Arun-1EV was more stable followed by Arun-2 therefore these two varieties can be recommended to farmers for cultivation in both environments

Stochastic modeling of cargo transport by teams of molecular motors

Many different types of cellular cargos are transported bidirectionally along microtubules by teams of molecular motors. The motion of this cargo-motors system has been experimentally characterized in vivo as processive with rather persistent directionality. Different theoretical approaches have been suggested in order to explore the origin of this kind of motion. An effective theoretical approach, introduced by M\"uller et al., describes the cargo dynamics as a tug-of-war between different kinds of motors. An alternative approach has been suggested recently by Kunwar et al., who considered the coupling between motor and cargo in more detail. Based on this framework we introduce a model considering single motor positions which we propagate in continuous time. Furthermore, we analyze the possible influence of the discrete time update schemes used in previous publications on the system's dynamic.Comment: Cenference proceedings - Traffic and Granular Flow 1