154 research outputs found
The Heterotic Dyonic Instanton
The static Yang-Mills-Higgs dyonic instanton is shown to have a
non-vanishing, but anti-self-dual, angular momentum 2-form with skew
eigenvalues equal to the electric charge; for large charge the angular momentum
causes the instanton to expand into a hyper-spherical shell. A class of exact
multi dyonic instantons is then found and then generalized to a new class of
1/4 supersymmetric, non-singular, stationary, exact solutions of the
ten-dimensional supergravity/Yang-Mills theory. These self-gravitating dyonic
instantons yield new heterotic string solitons, to leading order in the inverse
string tension.Comment: 18 pages, LaTeX, no figures. Previous revision was to include exact
multi-solitons. Third version corrects typos and ADM energy formul
Non-BPS Branes in a Type I Orbifold
We analyse the spectrum of non-BPS branes in the type I theory on the
orbifold . We present a detailed analysis of the action of the
worldsheet parity on the different D-brane boundary state sectors of
type IIB on , using the covariant formulation. Using these
results we derive the spectrum of branes in the type I orbifold. We find
- and - charged non-BPS branes. A study of the stability of these
branes in the type I orbifold is also presented. We find that the type I
non-BPS D-particle and D-instanton remain stable in the orbifold. The
D-particle carries no charge whereas the non-BPS D-instanton can carry twisted
R-R charge.Comment: 32 pages, LaTeX, no figures. Stability analysis has been corrected:
the D-particle is found to be stabl
Spacetime-Filling Branes and Strings with Sixteen Supercharges
We discuss branes whose worldvolume dimension equals the target spacetime
dimension, i.e. ``spacetime-filling branes''. In addition to the D9-branes,
there are 9-branes in the NS-NS sectors of both the IIA and IIB strings. The
worldvolume actions of these branes are constructed, via duality, from the
known actions of branes with codimension larger than zero. Each of these types
of branes is used in the construction of a string theory with sixteen
supercharges by modding out a type II string by an appropriate discrete
symmetry and adding 32 9-branes. These constructions are related by a web of
dualities and each arises as a different limit of the Horava-Witten
construction.Comment: 43 pages, LaTeX, 8 figures, uses html.sty, version to appear in Nucl.
Phys.
T-duality and Actions for Non-BPS D-branes
We employ T-duality to restrict the tachyon dependence of effective actions
for non-BPS D-branes. For the Born-Infeld part the criteria of T-duality and
supersymmetry are satisfied by a simple extension of the D-brane Born-Infeld
action.Comment: Latex, 11 page
Herramienta para estimación de generación fotovoltaica en edificaciones e integración arquitectónica
Se presenta en este trabajo una herramienta didáctica destinada a proyectistas e instaladores que disponen sus sistemas solares fotovoltaicos sobre azoteas de edificios, cubiertas inclinadas y sobre otras superficies edilicias o no. Dichas superficies no siempre posibilitan una perfecta inclinación y orientación de los arreglos de paneles para lograr la máxima generación que el equipo permite. A través de un poliedro de generación solar es posible estimar de manera rápida, sencilla y con un bajo grado de error, la energía disponible para instalar estos equipos en edificios ubicados en los principales centros urbanos de la República Argentina y en diferentes inclinaciones y orientaciones distintas de la ideal. Esta herramienta también puede resultar de utilidad para aquellos ciudadanos interesados en realizar estimaciones de generación fotovoltaica en instalaciones dentro de la normativa de generación distribuida actual.In residential photovoltaic systems, teachers, designers and installers, usually work with different tools to estimate the annual energy production. The objective of this article is to present a new simple tool which can be used not only for teaching but also by designers and installers. Photovoltaic systems lay over rooftops, sloping roofs and others building surfaces. These surfaces may not allow a perfect slope or orientation for the solar panels to obtain the maximum energy production. Using a polyhedron of solar energy production, it is possible to estimate the energy production of a system in a fast and easy way with low error ratio. This tool is intended to be used in the main urban centers in Argentine. In addition, it could be useful in promotion and outreach addressed to citizens who are in the process of buying a photovoltaic system under the new law of distributed energy generation.Asociación Argentina de Energías Renovables y Medio Ambiente (ASADES
Instantonic dyons of Yang-Mills--Chern-Simons models in d=2n+1 dimensions, n>2
We investigate finite energy solutions of Yang-Mills--Chern-Simons systems in
odd spacetime dimensions, d=2n+1, with n>2. This can be carried out
systematically for all n, but the cases n=3,4 corresponding to a 7,8
dimensional spacetime are treated concretely. These are static and spherically
symmetric configurations, defined in a flat Minkowski background. The value of
the electric charge is fixed by the Chern-Simons coupling constant.Comment: 15 pages, 4 figure
Gauged supergravity from dimensional reduction
We perform a generalised Scherk-Schwarz reduction of the effective action of the heterotic string on T6 to obtain a massive N = 4 supergravity theory in four dimensions. The local symmetry-group of the resulting d = 4 theory includes a Heisenberg group, which is a subgroup of the global 0(6,6 + n) obtained in the standard reduction. We show explicitly that the same theory can be obtained by gauging this Heisenberg group in d = 4, N = 4 supergravity.
Systematic benchmarking of tools for CpG methylation detection from nanopore sequencing
DNA methylation plays a fundamental role in the control of gene expression and genome integrity. Although there are multiple tools that enable its detection from Nanopore sequencing, their accuracy remains largely unknown. Here, we present a systematic benchmarking of tools for the detection of CpG methylation from Nanopore sequencing using individual reads, control mixtures of methylated and unmethylated reads, and bisulfite sequencing. We found that tools have a tradeoff between false positives and false negatives and present a high dispersion with respect to the expected methylation frequency values. We described various strategies to improve the accuracy of these tools, including a consensus approach, METEORE ( https://github.com/comprna/METEORE ), based on the combination of the predictions from two or more tools that shows improved accuracy over individual tools. Snakemake pipelines are also provided for reproducibility and to enable the systematic application of our analyses to other datasets
Sistema fotovoltaico conectado a red en el Palacio de Hacienda: análisis de la generación en un año y estudio de sombras
En el marco del proyecto IRESUD, en marzo de 2015 se instaló un sistema fotovoltaico conectado a la red eléctrica en la terraza del Palacio de Hacienda, sito en la calle Hipólito Yrigoyen 250 de la Ciudad Autónoma de Buenos Aires. En el presente trabajo se muestran las comparaciones entre las mediciones de la energía inyectada a la red durante el período abril 2015 - marzo 2016 y las obtenidas con simulaciones mediante el programa comercial PVSyst, así como el estudio de las pérdidas causadas por las sombras sobre el sistema.In the frame of Iresud Project, in March 2015 a grid connected photovoltaic system was installed on the terrace of the “Palacio de Hacienda”, headquarters of the Ministry of Economy, in Buenos Aires city. In this paper, comparisons between measurements of the energy injected to the grid during the period April 2015 - March 2016 and those obtained with simulations using the commercial program PVSyst are shown. Losses caused by near shadows on the system are also analyzed.Tema 13: Generación distribuida.Facultad de Arquitectura y Urbanism
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