The old variational functional for the total energy of a many-electron system proposed by Luttinger and Ward (LW) in 1960 is here tested on the electron gas at the level of the GW approximation. Using a simple non-interacting Green function to evaluate the fuctional we obtain a correlation energy very close to that of a fully self-consistent $GW$ calculation which, in turn, is very close to that o

The fast correlation attack is a general cryptanalytic attack directed at stream ciphers and is related to the decoding of low-density parity-check (LDPC) codes. In this paper, we improve the message passing algorithm by exploiting the fact that the sum of an arbitrary number of initial state variables, called a fixed point, can be written as the sum of only a few other variables. This will result

Abstract in Undetermined The COST 2100 MIMO channel model is the latest evolution of the geometry-based stochastic channel models developed by the COST actions. This paper provides a full parameterization of the COST 2100 channel model in four indoor scenarios based on channel measurements conducted in two different buildings. In addition to the parameter values, the meaning and extraction method

Den här boken är tänkt att ge en kort introduktion till några av de viktigaste händelserna inom den ideologiska processen som sträcker sig från det indianska Amerikas tusenåriga kultur, genom spansk och portugisisk kolonialism och till nutidens ”Latinamerika”.

Artikeln handlar om möjligheten att avvika från lagens ordalydelse på kontraktsrättens område

Vad kännetecknar olika klassrumspraktiker i timplanelösa skolor? Hur är undervisningen organiserad och hur genomförs den? Vilka erfarenheter erbjuds eleverna och vilka förmågor kan de utveckla? Vad händer med likvärdigheten om en typ av undervisning dominerar? Konsekvenserna av försöket med slopad timplan har studerats inom projektet 'Timplanelösa skolors miljöer för lärande'. Studien visar att ol

Originalidad y periferia. Existe una forma de "originalidad" que nada tiene que ver con la forma de interpretar los hechos culturales. Según esta manera de ver la cultura, lo que hace a ésta original es su carácter único, su particularidad antropológica e histórica. Del mismo modo que cada ser vivo es portador de un banco genético único, es cada forma de la cultura portadora de una herencia cult

Colchicine, a well-known alkaloid isolated from Colchicum autumnale, interferes with microtubule growth and, therefore affects mitosis and other microtubule dependent functions. We have been interested in the structural requirements of colchicine for tubulin recognition. In particular our interests have been focused on the active colchicine conformation with respect to the pivot bond joining the A