Search results for "Univers"
showing 10 items of 6284 documents
Cosmic Dark Radiation and Neutrinos
2013
New measurements of the cosmic microwave background (CMB) by the Planck mission have greatly increased our knowledge about the universe. Dark radiation, a weakly interacting component of radiation, is one of the important ingredients in our cosmological model which is testable by Planck and other observational probes. At the moment, the possible existence of dark radiation is an unsolved question. For instance, the discrepancy between the value of the Hubble constant, H-0, inferred from the Planck data and local measurements of H-0 can to some extent be alleviated by enlarging the minimal ACDM model to include additional relativistic degrees of freedom. From a fundamental physics point of v…
Uncertainty on w from large-scale structure
2012
We find that if we live at the center of an inhomogeneity with total density contrast of roughly 0.1, dark energy is not a cosmological constant at 95% confidence level. Observational constraints on the equation of state of dark energy, w, depend strongly on the local matter density around the observer. We model the local inhomogeneity with an exact spherically symmetric solution which features a pressureless matter component and a dark-energy fluid with constant equation of state and negligible sound speed, that reaches a homogeneous solution at finite radius. We fit this model to observations of the local expansion rate, distant supernovae and the cosmic microwave background. We conclude …
SOCIAL NETWORKS, BIG DATA AND TRANSPORT PLANNING
2016
[EN] The characteristics of people who are related or tied to each individual affects her activity-travel behavior. That influence is especially associated to social and recreational activities, which are increasingly important. Collecting high quality data from those social networks is very difficult using traditional travel surveys, because respondents are asked about their general social life, which is most demanding to remember that specific facts. On the other hand, currently there are different potential sources of transport data, which is characterized by the huge amount of information available, the velocity with it is obtained and the variety of format in which is presented. This s…
Perfiles de personalidad y resiliencia en dolor crónico: utilidad del CDRISC-10 para discriminar los tipos resiliente y vulnerable
2019
espanolRESUMEN Introduccion: Uno de los aspectos psicologicos asociados a la vivencia del dolor cronico han sido los perfiles de personalidad y, relacionado con ellos, la resiliencia. En el dolor cronico la resiliencia se refiere tanto a la capacidad de volver atras tras el dano inicial como tambien a la de continuar con su funcionamiento habitual pese a la repeticion de los problemas. En este campo, sin embargo, no hay referencias sobre si la resiliencia se relaciona con los perfiles de personalidad. En trabajos previos se ha abordado la cuestion de los perfiles de personalidad relacionados con el dolor cronico. El objetivo de este trabajo es replicar los perfiles encontrados previamente, …
La crisi delle Università italiane: il Bilancio sociale può avere un ruolo per il suo superamento?
2012
Ueber die zweckmässige Führung des academischen Lebens: ein Leitfaden zu Vorlesungen [Über die zweckmässige Führung des akademischen Lebens...]
1805
Critical behavior of a colloid-polymer mixture confined between walls
2006
We investigate the influence of confinement on phase separation in colloid-polymer mixtures. To describe the particle interactions, the colloid-polymer model of Asakura and Oosawa [J. Chem. Phys. 22, 1255 (1954)] is used. Grand canonical Monte Carlo simulations are then applied to this model confined between two parallel hard walls, separated by a distance D=5 colloid diameters. We focus on the critical regime of the phase separation and look for signs of crossover from three-dimensional (3D) Ising to two-dimensional (2D) Ising universality. To extract the critical behavior, finite size scaling techniques are used, including the recently proposed algorithm of Kim et al. [Phys. Rev. Lett. 91…
Profesors Dr.habil.phys. Juris Zaķis : dzīve un darbs
2022
Grāmata ir veltījums rektoram Jurim Zaķim - personībai, kas ilgus darba gadus bija LU saimes vadītājs un idejiskais līderis. Grāmata balstīta uz kolēģu atmiņām, sniedz ieskatu rektora amata daudzveidīgajos darba virzienos vēstures periodā, kad bruka padomju iekārta un sākās jaunā tūkstošgade.
Profesors Dr. habil. phys. Ivars Lācis : dzīve un darbs
2022
2020. gadā maijā aprit tieši 20 gadi, kopš profesors Ivars Lācis stājās rektora amatā. Grāmatas saturs veidots kā stāstījums, kurā ar savām atziņām par Ivaru Lāci kā kolēģi, profesoru un rektoru dalās laikabiedri Universitātē. Grāmatas saturs papildināts ar bagātīgu fotogrāfiju klāstu no profesora Ivara Lāča personīgā arhīva un LU fotoarhīvā ievietotām fotogrāfijām. Savukārt personību raksturo dokumentālās liecības, kuras apkopotas Ivara Lāča LU personas lietā: iesniegumu, rīkojumu un citu dokumentu kopijas. Grāmatā iekļauta arī Bibliotēkas darbinieku sastādītais profesora Ivara Lāča bibliogrāfiskais rādītājs, kur hronoloģiskā secībā apkopoti publicēto darbu bibliogrāfiskie apraksti no 1976…
Peter Schmidt, Ostasienwissenschaftler, Linguist und Folklorist: eine vorläufige Biographie
1982
Publikācija par latviešu sinologu, valodnieku, etnogrāfu un folkloristu Pēteri Šmitu ietver Hartmuta Valravensa ievadtekstu, Haralda Biezā uzrakstīto biogrāfisko apcerējumu, dzīves datu, pedagoģiskās darbības un ceļojumu hronoloģiju, profesora Pētera Šmita darbu bibliogrāfiju, literatūru par viņu, personīgo saraksti un Latvijas Universitātes profesora Pētera Šmita grāmatu kolekciju Latvijas Universitātes Bibliotēkā.