16,855 research outputs found
Degeneracy loci, virtual cycles and nested Hilbert schemes II
We express nested Hilbert schemes of points and curves on a smooth projective
surface as "virtual resolutions" of degeneracy loci of maps of vector bundles
on smooth ambient spaces.
We show how to modify the resulting obstruction theories to produce the
virtual cycles of Vafa-Witten theory and other sheaf-counting problems. The
result is an effective way of calculating invariants (VW, SW, local PT and
local DT) via Thom-Porteous-like Chern class formulae.Comment: 42 pages. Two referees' corrections. To appear in Compositi
Degeneracy loci, virtual cycles and nested Hilbert schemes I
Given a map of vector bundles on a smooth variety, consider the deepest
degeneracy locus where its rank is smallest. We show it carries a natural
perfect obstruction theory whose virtual cycle can be calculated by the
Thom-Porteous formula.
We show nested Hilbert schemes of points on surfaces can be expressed as
degeneracy loci. We show how to modify the resulting obstruction theories to
recover the virtual cycles of Vafa-Witten and reduced local DT theories.
The result computes some Vafa-Witten invariants in terms of Carlsson-Okounkov
operators. This proves and extends a conjecture of Gholampour-Sheshmani-Yau and
generalises a vanishing result of Carlsson-Okounkov.Comment: Published version. 29 page
Current iodine status and progress over the last decade towards elimination of iodine deficiency in Rajkot District, Gujarat
Objective: To find out prevalence of goitre in primary school children; to compare prevalence with previous survey; to determine median urinary iodine concentration; to assess level of iodine in salt samples at household and retail shop level; and to study profile of salt sold at retail shops. Design & Settings: 30 cluster survey study in primary schools of Rajkot district. Subjects: Children studying in 1st to 7th standard. Methods: Total 70 students including five boys and five girls from 1st to 7th standard present in class on the day of visit were selected randomly for Goitre examination, so, total 2100 students were examined in schools. Urine sample was collected from one boy & one girl from each standard in each cluster. From community, 28 students including two boys and two girls from each standard in same age group were examined and also salt samples were tested from their households. From each village, one retail shop was visited and salts were purchased and tested for iodine on the spot with spot kit. Results: Goitre prevalence was found 8.8% among primary school children compare to 5.6% in 1999. As the age increases the Goitre prevalence also increases except in age group of 12 years. Median urinary iodine excretion level was found 110 µg/L. Iodine level >15 ppm was found in 81% salts samples tested at household level. Conclusion: Present study showed mild Goitre prevalence in primary school children in Rajkot district of Gujarat but still iodine content of salt found inadequate at household level
Active transport in a channel: stabilisation by flow or thermodynamics
Recent experiments on active materials, such as dense bacterial suspensions
and microtubule-kinesin motor mixtures, show a promising potential for
achieving self-sustained flows. However, to develop active microfluidics it is
necessary to understand the behaviour of active systems confined to channels.
Therefore here we use continuum simulations to investigate the behaviour of
active fluids in a two-dimensional channel. Motivated by the fact that most
experimental systems show no ordering in the absence of activity, we
concentrate on temperatures where there is no nematic order in the passive
system, so that any nematic order is induced by the active flow. We
systematically analyze the results, identify several different stable flow
states, provide a phase diagram and show that the key parameters controlling
the flow are the ratio of channel width to the length scale of active flow
vortices, and whether the system is flow aligning or flow tumbling
Large Tunneling Anisotropic Magneto-Seebeck Effect in a CoPt|MgO|Pt Tunnel Junction
We theoretically investigate the Tunneling Anisotropic Magneto-Seebeck effect
in a realistically-modeled CoPt|MgO|Pt tunnel junction using coherent transport
calculations. For comparison we study the tunneling magneto-Seebeck effect in
CoPt|MgO|CoPt as well. We find that the magneto-Seebeck ratio of CoPt|MgO|Pt
exceeds that of CoPt|MgO|CoPt for small barrier thicknesses, reaching 175% at
room temperature. This result provides a sharp contrast to the
magnetoresistance, which behaves oppositely for all barrier thicknesses and
differs by one order of magnitude between devices. Here the magnetoresistance
results from differences in transmission brought upon by changing the tunnel
junction's magnetization configuration. The magneto-Seebeck effect results from
variations in asymmetry of the energy-dependent transmission instead. We report
that this difference in origin allows for CoPt|MgO|Pt to possess strong thermal
magnetic-transport anisotropy.Comment: 6 pages, 6 figure
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