4,864 research outputs found
Prediction of a surface state and a related surface insulator-metal transition for the (100) surface of stochiometric EuO
We calculate the temperature and layer-dependent electronic structure of a
20-layer EuO(100)-film using a combination of first-principles and model
calculation based on the ferromagnetic Kondo-lattice model. The results suggest
the existence of a EuO(100) surface state which can lead to a surface
insulator-metal transition.Comment: 9 pages, 5 figures, Phys. Rev. Lett. (in press
PatSeeding: A Standalone Track Reconstruction Algorithm
A standalone pattern recognition algorithm for the LHCb T stations is presented. Its performance on B_d --> J/psi K_s and minimum bias Monte Carlo events is evaluated, and tunings for reconstruction without magnetic field, with misalignments or for reconstruction of cosmics are shown. Furthermore, this notes describes changes to the algorithm which make it suitable for trigger applications, especially for Level 0 confirmation (the performance of these modifications is evaluated in an upcoming LHCb note)
Projecting the Kondo Effect: Theory of the Quantum Mirage
A microscopic theory is developed for the projection (quantum mirage) of the
Kondo resonance from one focus of an elliptic quantum corral to the other
focus. The quantum mirage is shown to be independent of the size and the shape
of the ellipse, and experiences \lambda_F/4 oscillations (\lambda_F is the
surface-band Fermi wavelength) with an increasing semimajor axis length. We
predict an oscillatory behavior of the mirage as a function of a weak magnetic
field applied perpendicular to the sample.Comment: 4 pages 2 figures include
Towards the infrared limit in SU(3) Landau gauge lattice gluodynamics
We study the behavior of the gluon and ghost dressing functions in SU(3)
Landau gauge at low momenta available on lattice sizes 12^4-32^4 at
=5.8, 6.0 and 6.2. We demonstrate the ghost dressing function to be
systematically dependent on the choice of Gribov copies, while the influence on
the gluon dressing function is not resolvable. The running coupling given in
terms of these functions is found to be decreasing for momenta q<0.6 GeV. We
study also effects of the finite volume and of the lattice discretization.Comment: 10 pages, 6 figures. Revised version to appear in Phys.Rev.D. Title
modified; a new subsection discusses finite volume and finite lattice spacing
effects; few references adde
Connectivity Profile of Middle Inferior Parietal Cortex Confirms the Hypothesis About Modulating Cortical Areas
According to the correlated transmitter-receptor based structure of the inferior parietal cortex (IPC), this brain area is divided into three clusters, namely, the caudal, the middle and the rostral. Nevertheless, in associating different cognitive functions to the IPC, previous studies considered this part of the cortex as a whole and thus inconsistent results have been reported. Using multiband echo planar imaging (EPI), we investigated the connectivity profile of the middle IPC while forty-five participants performed a task requiring cognitive control. The middle IPC demonstrated functional associations which do not have similarities to a contributing part in the frontoparietal network, in processing cognitive control. At the same time, this cortical area showed negative functional connectivity with both the precuneus cortex, which is resting- state related, and brain areas related to general cognitive functions. That is, the functions of the middle IPC are not accommodated by the traditional categorization of different brain areas i.e. resting state-related or task-related networks and this advanced our hypothesis about modulating cortical areas. Such brain areas are characterized by their negative functional connectivity with parts of the cortex involved in task performance, proportional to the difficulty of the task; yet, their functional associations are inconsistent with the resting state-related cortical areas
Formant frequencies and vowel space area in Javanese and Sundanese English language learners
Several studies have documented how first language (L1) vowel systems play an important role in the vowel
production of a second language (L2). L2 learners of Western languages who exhibit a smaller L1 vowel system
are predicted to struggle with producing L2 vowels. However, there remains a paucity of evidence on how the
L1 vowel system of non-Western languages interferes with L2 vowel production In this case, the focus is
specifically on Javanese and Sundanese, two of the most widely spoken Indonesian local languages. This
present study investigated how the six Javanese vowels and the seven Sundanese vowels influence the
production of ten English vowels. In this experiment, 40 speakers, Javanese, Sundanese, and 10 native English
speakers, participated in the production task. Spectral dimensions, including first (F1) and second formant (F2)
frequencies, were analysed acoustically. According to the Speech Learning Model, Javanese and Sundanese
speakers should have trouble producing similar vowels such as (/I, ɛ, ʊ/) and should not exhibit greater L2
differences with new vowels such as (/i:, æ, ɑː, ɔ:, u:, ʌ, ɜ:/). Indeed, the results demonstrated that the Javanese
speakers did have different F1 and F2 values with the English vowels (/i:, æ, ɑː, ɔ:, u:, ʌ, ɜ:/) and the Sundanese
speakers produced different F1 and F2 values for vowels (/æ, ɑː, ɔ:/) when compared to the English native
speakers. Interestingly, though vowels (/I, ʊ/) were considered to be similar vowels in the L1 vowel system, the
Javanese and Sundanese speakers also showed differences in the formant structure. The vowel space area in the
productions by Javanese and Sundanese speakers was slightly smaller than that of the native English speakers.
The present study is expected to serve as a basis for future studies and provide the patterns of English vowels
produced by Javanese and Sundanese learners of English
Kondo-lattice model: Application to the temperature-dependent electronic structure of EuO(100) films
We present calculations for the temperature-dependent electronic structure
and magnetic properties of thin ferromagnetic EuO films. The treatment is based
on a combination of a multiband-Kondo lattice model with first-principles
TB-LMTO band structure calculations. The method avoids the problem of
double-counting of relevant interactions and takes into account the correct
symmetry of the atomic orbitals. We discuss the temperature-dependent
electronic structures of EuO(100) films in terms of quasiparticle densities of
states and quasiparticle band structures. The Curie temperature T_C of the EuO
films turns out to be strongly thickness-dependent, starting from a very low
value = 15K for the monolayer and reaching the bulk value at about 25 layers
The correlation between auditory speech sensitivity and speaker recognition ability
In various applications of forensic phonetics the question arises as to how far aural-perceptual speaker recognition performance is reliable. Therefore, it is necessary to examine the relationship between speaker recognition results and human perception/production abilities like musicality or speech sensitivity. In this study, performance in a speaker recognition experiment and a speech sensitivity test are correlated. The results show a moderately significant positive correlation between the two tasks. Generally, performance in the speaker recognition task was better than in the speech sensitivity test. Professionals in speech and singing yielded a more homogeneous correlation than non-experts. Training in speech as well as choir-singing seems to have a positive effect on performance in speaker recognition. It may be concluded, firstly, that in cases where the reliability of voice line-up results or the credibility of a testimony have to be considered, the speech sensitivity test could be a useful indicator. Secondly, the speech sensitivity test might be integrated into the canon of possible procedures for the accreditation of forensic phoneticians. Both tests may also be used in combination
A Review on Grammatical Gender Agreement in Speech Production
Grammatical gender agreement has been well addressed in language comprehension but less so in language production. The present article discusses the arguments derived from the most prominent language production models on the representation and processing of the grammatical gender of nouns in language production and then reviews recent empirical studies that provide some answers to these arguments
- …