169 research outputs found
Augmenting a rugged standard DJ turntable with a tangible interface for music browsing and playback manipulation
TIMBAP is a new solution for the digital disc jockey (DJ) that provides a rugged tangible interface for music brows-ing and playback manipulation. Like many others it is based on an acoustic timecode signal recorded to vinyl records. In contrast to existing digital solutions however, it completely releases the DJ from mouse, keyboard and monitor. Instead it relies on physical interaction with the standard club turntable only. The rotation of the turntable serves as a means of scrolling through the music collection automatically. The user stays in control though as this can always be overridden by a manual intervention like holding the record or winding it back. In order to provide goal-oriented search, we also support a direct absolute position-ing using the tone arm.
On the Nature of the Debye-Process in Monohydroxy Alcohols: 5-Methyl-2-Hexanol Investigated by Depolarized Light Scattering and Dielectric Spectroscopy
The slow Debye-like relaxation in the dielectric spectra of monohydroxy
alcohols is a matter of long standing debate. In the present work, we probe
reorientational dynamics of 5-methyl-2-hexanol with dielectric spectroscopy and
depolarized light scattering (DDLS) in the supercooled regime. While in a
previous study of a primary alcohol no indication of the Debye peak in the DDLS
spectra was found, we now for the first time report clear evidence of a Debye
contribution in a monoalcohol in DDLS. A quantitative comparison between the
dielectric and DDLS manifestation of the Debye peak reveals that while the
dielectric Debye process represents fluctuations in the end-to-end vector
dipole moment of the transient chains, its occurrence in DDLS shows a more
local signature and is related to residual correlations which occur due to a
slight anisotropy of the -relaxation caused by the chain formation.Comment: 5 pages, 5 figures; accepted in Phys. Rev. Let
Dipole-dipole correlations and the Debye process in the dielectric response of non-associating glass forming liquids
The non-exponential shape of the -process observed in supercooled
liquids is considered as one of the hallmarks of glassy dynamics and has thus
been under study for decades, but is still poorly understood. For a polar van
der Waals liquid, we show here - in line with a recent theory - that
dipole-dipole correlations give rise to an additional process in the dielectric
spectrum slightly slower than the -relaxation, which renders the
resulting combined peak narrower than observed by other experimental
techniques. This is reminiscent of the Debye process found in monohydroxy
alcohols. The additional peak can be suppressed by weakening the dipole-dipole
interaction via dilution with a nonpolar solvent
Temperature dependence of the static permittivity andintegral formula for the Kirkwood correlation factor ofsimple polar fluids
An exact integral formula for the Kirkwood correlation factor of isotropic
polar fluids is derived from the equilibrium averaged rotational Dean
equation, which as compared to previous approaches easily lends itself to
further approximations. The static linear permittivity of polar fluids
is calculated as a function of temperature, density and molecular
dipole moment in vacuo for arbitrary pair interaction potentials. Then, using
the Kirkwood superposition approximation for the three-body orientational
distribution function, we suggest a simple way to construct model potentials of
mean torques considering permanent and induced dipole moments. We successfully
compare the theory with the experimental temperature dependence of the static
linear permittivity of various polar fluids such as a series of linear
monohydroxy alcohols, water, tributyl phosphate, acetonitrile, acetone,
nitrobenzene and dimethyl sulfoxide, by fitting only one single parameter,
which describes the induction to dipole-dipole energy strength ratio. We
demonstrate that comparing the value of with unity in order to deduce the
alignment state of permanent dipole pairs, as is currently done is in many
situations, is a misleading oversimplification, while the correct alignment
state is revealed when considering the proper interaction potential. Moreover
we show, that picturing H-bonding polar fluids as polar molecules with
permanent and induced dipole moments without invoking any specific H-bonding
mechanism is in many cases sufficient to explain experimental data of the
static dielectric constant. In this light, the failure of the theory to
describe the experimental temperature dependence of the static dielectric
constant of glycerol, a non-rigid polyalcohol, is not due to the lack of
specific H-bonding mechanisms, but rather to an oversimplified model potential
for that particular molecule
Universal Structural Relaxation in Supercooled Liquids
One of the hallmarks of molecular dynamics in deeply supercooled liquids is
the non-exponential character of the relaxation functions. It has been a long
standing issue if 'universal' features govern the lineshape of glassy dynamics
independent of any particular molecular structure or interaction. In the paper,
we elucidate this matter by giving a comprehensive comparison of the spectral
shape of depolarized light scattering and dielectric data of deeply supercooled
liquids. The light scattering spectra of very different systems, e.g. hydrogen
bonding and van der Waals liquids but also ionic systems, almost perfectly
superimpose and show a generic lineshape of the structural relaxation,
approximately following a high frequency power law . However,
the dielectric loss peak shows a more individual shape. In systems with low
dipole moment generic behavior is also observed in the dielectric spectra,
while in strongly dipolar liquids additional crosscorrelation contributions
mask the generic structural relaxation
Surface hopping dynamics including intersystem crossing using the algebraic diagrammatic construction method
© 2017 Author(s). We report an implementation for employing the algebraic diagrammatic construction to second order [ADC(2)] ab initio electronic structure level of theory in nonadiabatic dynamics simulations in the framework of the SHARC (surface hopping including arbitrary couplings) dynamics method. The implementation is intended to enable computationally efficient, reliable, and easy-to-use nonadiabatic dynamics simulations of intersystem crossing in organic molecules. The methodology is evaluated for the 2-thiouracil molecule. It is shown that ADC(2) yields reliable excited-state energies, wave functions, and spin-orbit coupling terms for this molecule. Dynamics simulations are compared to previously reported results using high-level multi-state complete active space perturbation theory, showing favorable agreement
Evaluation of Medication-Related Osteonecrosis of the Jaw (MRONJ) in Terms of Staging and Treatment Strategies by Dental Students at Different Educational Levels
Background: The role of medication-related osteonecrosis of the jaw (MRONJ) as a dentomaxillo-
facial pathology is becoming increasingly important due to its growing prevalence. The
success of preventive and therapeutic measures relies mainly on the dentist’s ability to correctly
diagnose the disease. Methods: The aim of this study was to evaluate the skills of dental students
of different educational levels in choosing the correct stage, diagnostics, and treatment option for
MRONJ based on clinical and radiographic imaging (panoramic radiograph, CBCT). The study
was designed as a cross-sectional cohort study. Twenty dental students were asked to complete a
questionnaire in their third and fifth year of studies in which they had to correctly stage the disease,
choose the radiological diagnostics and recommend the treatment. The control group contained
experienced oral and maxillofacial surgeons. Results: With an overall performance of 59% (third
year: 145.2/248 points; fifth year: 145.3/248 points), no statistically significant difference between the
educational levels could be observed. The classification based on CBCT imaging was significantly
more often correct compared to panoramic radiographs (p < 0.001). Conclusions: This study highlights
students’ lack of knowledge in staging, diagnostics, and treatment of MRONJ, even though the
CBCT positively affected decision-making. No significant increase in knowledge could be confirmed
through clinical education. This study highlights the need for students to catch up on MRONJ
diagnostics and treatment planning. Further expansion of teaching in this disease’s context and X-ray
diagnostics is needed
Entangling a Hole Spin with a Time-Bin Photon: A Waveguide Approach for Quantum Dot Sources of Multi-Photon Entanglement
Deterministic sources of multi-photon entanglement are highly attractive for
quantum information processing but are challenging to realize experimentally.
In this paper, we demonstrate a route towards a scaleable source of time-bin
encoded Greenberger-Horne-Zeilinger and linear cluster states from a
solid-state quantum dot embedded in a nanophotonic crystal waveguide. By
utilizing a self-stabilizing double-pass interferometer, we measure a
spin-photon Bell state with fidelity and devise steps for
significant further improvements. By employing strict resonant excitation, we
demonstrate a photon indistinguishability of , which is
conducive to fusion of multiple cluster states for scaling up the technology
and producing more general graph states.Comment: Manuscript: 7 pages, 3 figures. Supplementary information: 23 pages,
12 figure
Predictors of competitive employment in individuals with severe mental illness: results from an observational, cross-sectional study in Germany
BACKGROUND: Employment is of great importance as it is associated with various positive effects. Individuals with severe mental illness (SMI) are often excluded from competitive employment. Current data on employment of individuals with mental illness are rare, and influencing factors are under-researched. The present study examines possible predictors of competitive employment among individuals with SMI. METHODS: This was a cross-sectional and multicentered study of 300 individuals with SMI aged 18 to 65 years. The following inclusion criteria were used: (I) diagnosis of schizophrenia, schizotypal and delusional disorders (ICD-10 F2x), or affective disorders (ICD-10 F3x), (II) duration of psychiatric illness ≥ 2 years, and (III) substantial impact of illness on social functioning. Participants were interviewed by trained staff using standardised instruments. The relationship between potential predictors (age, sex, education, marital status, living situation, migration background, psychosocial functioning, age at first mental problem, physical illness, work ability) and employment was analysed using a hierarchic binary logistic regression model. RESULTS: Only one-third (34%) of participants were competitively employed. Almost one-third were unemployed (30%), and 28% reported early retirement due to mental illness. Psychosocial functioning was positively associated with competitive employment (OR = 1.09, 95% CI: 1.05 – 1.13, p < 0.001); concurrent chronic physical illness was negatively associated with competitive employment (OR = 0.38, 95% CI: 0.21 – 0.71, p = 0.002). CONCLUSIONS: Findings confirm a high risk of exclusion from competitive employment among individuals with SMI. Nonetheless, a substantial proportion of individuals are employed. Findings call for efforts to maintain or enhance workforce participation among individuals with SMI. A special focus should be placed on improving physical health and strengthening psychosocial functioning. TRIAL REGISTRATION: The study was registered in the German Clinical Trials Register (DRKS) under the registration number DRKS00015801 before the start of recruitment (Registration date: 21.02.2019)
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