Search results for "Anders"
showing 10 items of 134 documents
MULTIFRACTAL ELECTRONIC WAVE FUNCTIONS IN THE ANDERSON MODEL OF LOCALIZATION
1992
Investigations of the multifractal properties of electronic wave functions in disordered samples are reviewed. The characteristic mass exponents of the multifractal measure, the generalized dimensions and the singularity spectra are discussed for typical cases. New results for large 3D systems are reported, suggesting that the multifractal properties at the mobility edge which separates localized and extended states are independent of the microscopic details of the model.
Dynamical Density-Matrix Renormalization Group for the Mott--Hubbard insulator in high dimensions
2004
We study the Hubbard model at half band-filling on a Bethe lattice with infinite coordination number in the paramagnetic insulating phase at zero temperature. We use the dynamical mean-field theory (DMFT) mapping to a single-impurity Anderson model with a bath whose properties have to be determined self-consistently. For a controlled and systematic implementation of the self-consistency scheme we use the fixed-energy (FE) approach to the DMFT. In FE-DMFT the onset and the width of the Hubbard bands are adjusted self-consistently but the energies of the bath levels are kept fixed relatively to both band edges during the calculation of self-consistent hybridization strengths between impurity …
How Universal is the Scaling Theory of Localization?
1991
The numerical implementation of the one-parameter scaling theory of localization is reviewed for the Anderson model of disordered solids. A finite-size scaling procedure is used to derive the 3D localization length and d.c.-conductivity from the raw data computed for quasi-1D systems by the strip-and-bar method. While a common scaling function can be unambiguously obtained for different distributions of the diagonal disorder in the Anderson model, discrepancies appear between the box and the Gaussian distribution with regard to the derived critical exponents. To discuss these effects, new results are presented for a triangular distribution, and a new method for the computation of the critic…
Ekspansja tradycyjnej muzyki podhalańskiej na północ
2020
Artykuł jest próbą przybliżenia zmian zachodzących w tradycyjnej muzyce Podhala w ciągu ostatnich stu pięćdziesięciu lat oraz jej wpływu na repertuar tradycyjny terenów położonych na północ od tego regionu. Wnioski zostały sformułowane na podstawie źródeł archiwalnych – pisanych i fonograficznych – oraz badań własnych przeprowadzonych w ciągu ostatniej dekady na terenie powiatów myślenickiego, suskiego i nowotarskiego (północna część). Wydaje się, że w XIX wieku istniała daleko idąca wspólnota repertuarowa Podhala i Beskidu, trudno więc prześledzić, czy podobne wątki tekstowe i melodyczne są dowodem na jedność repertuaru, czy może na ścisłą ekspansję muzyki z Podhala w kierunku północnym. W…
Cracking the nut: Geographical adjacency of sister taxa supports vicariance in a polytomic salamander clade in the absence of node support
2008
The urodelan genus Lyciasalamandra, which inhabits a relatively small area along the southern Turkish coast and some Aegean islands, provides an outstanding example of a diverse but phylogenetically unresolved taxon. Molecular trees contain a single basal polytomy that could be either soft or hard. We here use the information of nuclear (allozymes) and mitochondrial (fractions of the 16S rRNA and ATPase genes) datasets in combination with area relationships of lineages to resolve the phylogenetic relationships among Lyciasalamandra species in the absence of sufficient node support. We can show that neither random processes nor introgressive hybridization can be invoked to explain that the m…
A family with various symptomatology suggestive of Anderson-Fabry disease and a genetic polymorphism of alpha galactosidase A gene.
2014
Background: Anderson/Fabry disease expresses a wide range of clinical variability in patients that it is possible to explain referring to a genetic variability with numerous mutations described in the literature (more than 600). Methods: We report some clinical cases of some members of a Sicilian family to express phenotypical variability of this disease in subjects with the same genetic mutation. Results: The first case was a 59-year-old female. Brain MRI revealed right frontal periventricular white matter of likely vascular-degenerative origin. The proband's alpha galactosidase A activity was 3.7. nmol/mL/h. Molecular genetics revealed a polymorphism: - 10 C. >. T; IVS 2-76_80del5; IVS…
Zvaigžņotā Debess: 2001, Vasara (172)
2001
Contents: U.Dzērvītis. Sensational Discovery in Experimental Physics ; G.Rozenfelds. Solar Eclipse in Kamishin ; Z.Alksne, A.Alksnis. Search for Exsoplanets: Success and Complications ; Z.Alksne. A Star is Growing in a Bok Globule ; A.Balklavs. Observation of an Interesting Object by Cosmic Radio Interferometer ; A.Balklavs. HALCA – Step in Space Radio Interferometry ; T.Czarnik. Physiological Adaptation to Weightlessness ; Ilgonis Vilks. Spaceflight. Period of Great Success (1961-1973) (concluded) ; Ilgonis Vilks. Spaceflight. Almost Everyday Life (1973-2000) ; V.Straupe. About Astronomy in One of the Biggest Museum of Natural Sciences ; Imants Vilks. Contemporary Science on Eternal Life ;…
Unveiling two-dimensional discrete quantum walks dynamics via dispersion relations
2011
The discrete, or coined, quantum walk (QW) [1] is a process originally introduced as the quantum counterpart of the classical random walk (RW). In both cases there is a walker and a coin: at every time step the coin is tossed and the walker moves depending on the toss output. Unlike the RW, in the QW the walker and coin are quantum in nature what allows the coherent superpositions right/left and head/tail happen. This feature endows the QW with outstanding properties, such as making the standard deviation of the position of an initially localized walker grow linearly with time t, unlike the RW in which this growth goes as t1/2. This has strong consequences in algorithmics and is one of the …
Parametric self-trapping in the presence of randomized quasi phase matching
2010
We report on experimental evidence of parametric spatial solitons in a quadratic crystal with randomized periodic ferroelectric poling. Two-color self-focusing via quadratic cascading overcomes the diffractive nature of both fundamental and frequency-doubled beams.
Reliģiski-filozofiski raksti, 20
2016
Katrā no rakstiem, kas publicēti šajos "Reliģiski-filozofiskos rakstos", šķiet, iespējams saskatīsim gan pagātnes sprostā patvērušos brīvību ar tās apreibinošajās ilūzijām par neatkarību ārpus sprosta, gan nojaust neatrisināmo un reizēm iznīcinošo dilemmu starp gara un reālo pasauli, starp spēli un brīdi, kad spēle beidzas. Piemēram, par pagātnē iesprostotas virtuālās pasaules konstruēšanu, kuras brīvībā izlaušanās mērāma iznīcinātu dzīvību tūkstošos, mums stāsta Māris Kūlis savā rakstā “Islāma valsts propaganda digitālajā laikmetā”. Uzsverot, ka Islāma valsts īstenotais militārais un ārkārtīgi agresīvais džihāds ar vēl nepieredzētām sekmēm ir izveidojis sinkrētisku reliģiskās degsmes un mū…