84 research outputs found
Prospects for terahertz imaging the human skin cancer with the help of gold-nanoparticles-based terahertz-to-infrared converter
The design is suggested, and possible operation parameters are discussed, of
an instrument to inspect a skin cancer tumour in the terahertz (THz) range,
transferring the image into the infrared (IR) and making it visible with the
help of standard IR camera. The central element of the device is the THz-to-IR
converter, a Teflon or silicon film matrix with embedded 8.5 nm diameter gold
nanoparticles. The use of external THz source for irradiating the biological
tissue sample is presumed. The converter's temporal characteristics enable its
performance in a real-time scale. The details of design suited for the
operation in transmission mode (in vitro) or on the human skin in reflection
mode {in vivo) are specified.Comment: To be published in the proceedings of the FANEM2018 workshop - Minsk,
3-5 June 201
Global aspects of the space of 6D N = 1 supergravities
We perform a global analysis of the space of consistent 6D quantum gravity
theories with N = 1 supersymmetry, including models with multiple tensor
multiplets. We prove that for theories with fewer than T = 9 tensor multiplets,
a finite number of distinct gauge groups and matter content are possible. We
find infinite families of field combinations satisfying anomaly cancellation
and admitting physical gauge kinetic terms for T > 8. We find an integral
lattice associated with each apparently-consistent supergravity theory; this
lattice is determined by the form of the anomaly polynomial. For models which
can be realized in F-theory, this anomaly lattice is related to the
intersection form on the base of the F-theory elliptic fibration. The condition
that a supergravity model have an F-theory realization imposes constraints
which can be expressed in terms of this lattice. The analysis of models which
satisfy known low-energy consistency conditions and yet violate F-theory
constraints suggests possible novel constraints on low-energy supergravity
theories.Comment: 41 pages, 1 figur
A Variational Deduction of Second Gradient Poroelasticity Part I: General Theory
Second gradient theories have to be used to capture how local micro
heterogeneities macroscopically affect the behavior of a continuum. In this
paper a configurational space for a solid matrix filled by an unknown amount of
fluid is introduced. The Euler-Lagrange equations valid for second gradient
poromechanics, generalizing those due to Biot, are deduced by means of a
Lagrangian variational formulation. Starting from a generalized Clausius-Duhem
inequality, valid in the framework of second gradient theories, the existence
of a macroscopic solid skeleton Lagrangian deformation energy, depending on the
solid strain and the Lagrangian fluid mass density as well as on their
Lagrangian gradients, is proven.Comment: 20 page
Wheat TaRab7 GTPase Is Part of the Signaling Pathway in Responses to Stripe Rust and Abiotic Stimuli
Small GTP-binding proteins function as regulators of specific intercellular fundamental biological processes. In this study, a small GTP-binding protein Rab7 gene, designated as TaRab7, was identified and characterized from a cDNA library of wheat leaves infected with Puccinia striiformis f. sp. tritici (Pst) the wheat stripe rust pathogen. The gene was predicted to encode a protein of 206 amino acids, with a molecular mass of 23.13 KDa and an isoeletric point (pI) of 5.13. Further analysis revealed the presence of a conserved signature that is characteristic of Rab7, and phylogenetic analysis demonstrated that TaRab7 has the highest similarity to a small GTP binding protein gene (BdRab7-like) from Brachypodium distachyon. Quantitative real-time PCR assays revealed that the expression of TaRab7 was higher in the early stage of the incompatible interactions between wheat and Pst than in the compatible interaction, and the transcription level of TaRab7 was also highly induced by environmental stress stimuli. Furthermore, knocking down TaRab7 expression by virus induced gene silencing enhanced the susceptibility of wheat cv. Suwon 11 to an avirulent race CYR23. These results imply that TaRab7 plays an important role in the early stage of wheat-stripe rust fungus interaction and in stress tolerance
Supersymmetric Yang-Mills theory on conformal supergravity backgrounds in ten dimensions
We consider bosonic supersymmetric backgrounds of ten-dimensional conformal
supergravity. Up to local conformal isometry, we classify the maximally
supersymmetric backgrounds, determine their conformal symmetry superalgebras
and show how they arise as near-horizon geometries of certain half-BPS
backgrounds or as a plane-wave limit thereof. We then show how to define
Yang-Mills theory with rigid supersymmetry on any supersymmetric conformal
supergravity background and, in particular, on the maximally supersymmetric
backgrounds. We conclude by commenting on a striking resemblance between the
supersymmetric backgrounds of ten-dimensional conformal supergravity and those
of eleven-dimensional Poincar\'e supergravity.Comment: 30 page
INFLUENCE OF MATRIX ELEMENT EFFECTS IN DETERMINING THE DENSITY-OF-STATES FROM PHOTOEMISSION SPECTRA - CU-PD ALLOY
It is found that a change of the photoionization matrix element with the binding energy in the valence band can cause a substantial discrepancy between the density of states and the photoemission spectrum for d-band metals and alloys even in the x-ray photoemission spectroscopy regime. This is the main cause of the controversial discrepancy between photoemission spectra and theoretical density of states predicted in the Korringa-Kohn-Rostoker coherent-potential approximation for Cu-Pd alloys, rather than the local lattice relaxation around Pd atomic sites.open1128sciescopu
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