Correction of balloon X-ray astronomy data for the effects of atmospheric attenuation, K X-ray escape, and energy resolution

Correction of balloon X ray astronomy data for atmospheric attenuation, escape, and energy resolutio

Suitability of Capital Allocations for Performance Measurement

Capital allocation principles are used in various contexts in which a risk capital or a cost of an aggregate position has to be allocated among its constituent parts. We study capital allocation principles in a performance measurement framework. We introduce the notation of suitability of allocations for performance measurement and show under different assumptions on the involved reward and risk measures that there exist suitable allocation methods. The existence of certain suitable allocation principles generally is given under rather strict assumptions on the underlying risk measure. Therefore we show, with a reformulated definition of suitability and in a slightly modified setting, that there is a known suitable allocation principle that does not require any properties of the underlying risk measure. Additionally we extend a previous characterization result from the literature from a mean-risk to a reward-risk setting. Formulations of this theory are also possible in a game theoretic setting

Time evolution of open quantum many-body systems

We establish a generic method to analyze the time evolution of open quantum many-body systems. Our approach is based on a variational integration of the quantum master equation describing the dynamics and naturally connects to a variational principle for its nonequilibrium steady state. We successfully apply our variational method to study dissipative Rydberg gases, finding excellent quantitative agreement with small-scale simulations of the full quantum master equation. We observe that correlations related to non-Markovian behavior play a significant role during the relaxation dynamics towards the steady state. We further quantify this non-Markovianity and find it to be closely connected to an information-theoretical measure of quantum and classical correlations.Comment: 5+3 pages, 8 figure

Multicritical behavior in dissipative Ising models

We analyze theoretically the many-body dynamics of a dissipative Ising model in a transverse field using a variational approach. We find that the steady state phase diagram is substantially modified compared to its equilibrium counterpart, including the appearance of a multicritical point belonging to a different universality class. Building on our variational analysis, we establish a field-theoretical treatment corresponding to a dissipative variant of a Ginzburg-Landau theory, which allows us to compute the upper critical dimension of the system. Finally, we present a possible experimental realization of the dissipative Ising model using ultracold Rydberg gases.Comment: 8 pages, 4 figure

A System for Acquiring, Processing, and Rendering Panoramic Light Field Stills for Virtual Reality

We present a system for acquiring, processing, and rendering panoramic light field still photography for display in Virtual Reality (VR). We acquire spherical light field datasets with two novel light field camera rigs designed for portable and efficient light field acquisition. We introduce a novel real-time light field reconstruction algorithm that uses a per-view geometry and a disk-based blending field. We also demonstrate how to use a light field prefiltering operation to project from a high-quality offline reconstruction model into our real-time model while suppressing artifacts. We introduce a practical approach for compressing light fields by modifying the VP9 video codec to provide high quality compression with real-time, random access decompression. We combine these components into a complete light field system offering convenient acquisition, compact file size, and high-quality rendering while generating stereo views at 90Hz on commodity VR hardware. Using our system, we built a freely available light field experience application called Welcome to Light Fields featuring a library of panoramic light field stills for consumer VR which has been downloaded over 15,000 times.Comment: 15 pages, 14 figures, 2 tables, accepted by SIGGRAPH Asia 2018, low-resolution versio

Performance Analysis of Hedge Fonds

El edificio dispone de dos portadas gemelas, probablemente fruto de su doble utilidad como pósito y carnicería, que siguen el mismo esquema compositivo; hueco adintelado enmarcado por pilastras y traspilastras con pinjante central, friso cornisa con frontón partido en cuyo centro y extremos laterales hay remates de bolas. Este tipo de remates también aparece en las ventanas del primer cuerpo de fachada. En el interior hay que destacar varias columnas y decoración de pinjantes en la parte de muro donde apoyan las bóvedas. Su fachada, de dos plantas, se articula en un orden gigante de pilastras toscanas, presentando dos portadas gemelas. Se cubre en planta baja con una estructura de bóvedas de arista cuatripartitas apoyadas sobre pilares y directamente en el muro. En planta alta presenta una arquería sobre pilares que sostiene la hilera del tejado a dos aguas. Destacamos en la parte superior de la fachada, un friso que lleva una inscripción así como un escudo situado en la parte izquierda de la fachada con una leyenda donde nos informa de la fecha y el autor de la obra, que dice así: ¿SIENDO CORREGIDOR DE ESTA VILLA DON MIGUEL DE PADILLA Y CONSTRUÍDO POR ALONSO RUIZ FLORINDO DE CARMONA EN EL AÑO 1790¿. Tiene una sola planta y está recorrido en su perímetro exterior por varios contrafuertes. En el espacio residual queda un patio al fondo del cual se encuentran las instalaciones sanitarias. Presenta estructura general de muros de carga, bóvedas de ladrillo, pilares y arcos del mismo material y cubiertas de madera de teja curva