507 research outputs found
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Convective, Diffusive Effects on Magnetic Fields and Eddy Current in Compulsators
Compulsators are being designed at ever increasing energies and energy densities and are required to deliver energy to the load in less than 10 ms. These require high speeds of operation and dense spacing of conductors. Diffusion of magnetic fields into the conductors and the formation of nonuniform, time-dependent distribution of eddy currents become dominant design considerations due to their major mechanical, thermal, and thermodynamic impact. A semi-analytical method has been developed for the two-dimensional analysis of field diffusion and eddy currents in high speed rotary machines to aid design decisions. Analytical results for fields are utilized and computations are restricted to the conductor domains alone. The semi-analytical method has been tested with two conductors (one in the stator and one in the rotor rotating at high speed). The resulting distributions of fields and eddy currents are presented.Center for Electromechanic
Spatial fluctuations at vertices of epithelial layers: quantification of regulation by Rho pathway
In living matter, shape fluctuations induced by acto-myosin are usually
studied in vitro via reconstituted gels, whose properties are controlled by
changing the concentrations of actin, myosin and cross-linkers. Such an
approach deliberately avoids to consider the complexity of biochemical
signaling inherent to living systems. Acto-myosin activity inside living cells
is mainly regulated by the Rho signaling pathway which is composed of multiple
layers of coupled activators and inhibitors. We investigate how such a pathway
controls the dynamics of confluent epithelial tissues by tracking the
displacements of the junction points between cells. Using a phenomenological
model to analyze the vertex fluctuations, we rationalize the effects of
different Rho signaling targets on the emergent tissue activity by quantifying
the effective diffusion coefficient, the persistence time and persistence
length of the fluctuations. Our results reveal an unanticipated correlation
between layers of activation/inhibition and spatial fluctuations within
tissues. Overall, this work connects the regulation via biochemical signaling
with mesoscopic spatial fluctuations, with potential application to the study
of structural rearrangements in epithelial tissues.Comment: 8 pages, 3 figure
Familial chylomicronemia: A rare case report
We report a 5-day-old neonate born out of 3rd-degree consanguinity who presented with milky blood, hepatosplenomegaly, and lipemia retinalis (fundus examination). The baby was asymptomatic, euglycemic, and did not have xanthomas. Lipid profile was altered (total cholesterol - 2340 mg/dl, triglycerides (TG) - >10,000 mg/dl, high-density lipoprotein - <5 mg/dl, lipoprotein (a) - <10.1 mg/dl, and apolipoprotein A1 - 795 mg/dl). Lipid profile of mother, father, and elder sibling were normal. The baby was started on skimmed milk powder and medium-chain TGs powder. The baby is under follow-up and lipid profile is improving
Oxidation of ɑ-hydroxyacids by N-bromophthalimide- Dependence of mechanism on pH of the medium
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Design of the Main Dipoles and Quadrupoles for the SSC Low Energy Booster
Biology and biometry of milkfish Chanos chanos (Forsskal)
Observations made on length-weight relationship for adult milkfish, ova-diameter frequency distribution,
relationship between fecundity and total length, fecundity and standard length; and weight and
fecundity are presented. The regression lines for 17 morphometric characters in relation to the standard
length were worked out. Snout to anal origin grows faster than snout to ventral origin. Head length; shows
faster rate of growth than head depth. The stomach content revealed the presence of diatoms predominantly.
Fecundity varied between 1424 and 5321 thousands in the fish in the size range of 1,100 - 1,340 mm
10-[2-(Dimethylamino)ethyl]-9-(4-methoxyphenyl)-3,3,6,6-tetramethyl-3,4,6,7,9,10-hexahydroacridine-1,8(2H,5H)-dione
In the title compound, C28H38N2O3, the central ring of the acridinedione system adopts a boat conformation, while one of the outer rings adopts a half-chair conformation and the conformation of the other outer ring is between a sofa and a half-chair. The acridinedione system is buckled, with an angle of 22.01 (3)°. The crystal packing comprises layers of molecules laid parallel to the ac plane, being reinforced by an intermolecular C—H⋯O interaction
Movement of deep-sea coral populations on climatic timescales
During the past 40,000 years, global climate has moved into and out of a full glacial period, with the deglaciation marked by several millennial-scale rapid climate change events. Here we investigate the ecological response of deep-sea coral communities to both glaciation and these rapid climate change events. We find that the deep-sea coral populations of Desmophyllum dianthus in both the North Atlantic and the Tasmanian seamounts expand at times of rapid climate change. However, during the more stable Last Glacial Maximum, the coral population globally retreats to a more restricted depth range. Holocene populations show regional patterns that provide some insight into what causes these dramatic changes in population structure. The most important factors are likely responses to climatically driven changes in productivity, [O_2] and [CO_3^(2–)]
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