Sebastian Fischer

Ab Initio study of neutron drops with chiral Hamiltonians

Abstract We report ab initio calculations for neutron drops in a 10 MeV external harmonic-oscillator trap using chiral nucleon–nucleon plus three-nucleon interactions. We present total binding energies, internal energies, radii and odd–even energy differences for neutron numbers N = 2 – 18 using the no-core shell model with and without importance truncation. Furthermore, we present total binding energies for N = 8 , 16 , 20 , 28 , 40 , 50 obtained in a coupled-cluster approach. Comparisons with quantum Monte Carlo results, where available, using Argonne v 8 ′ with three-nucleon interactions reveal important dependences on the chosen Hamiltonian.

Potential of the hybrid operating modes of the plug-in hybrid powertrain concept ‘Two-Drive Transmission with Range Extender’ (DE-REX)

The Two-Drive-Transmission (TDT) is an innovative and modular powertrain concept. The layout of the specific variant “Two-Drive Transmission with Range-Extender” (called “TDT E-REV 2+2 Gears” in) is shown. The concept combines the advantages of parallel hybrid architectures of plug-in hybrid electric vehicles (PHEV) as well as the benefits of series hybrid drives as found in extended-range electric vehicles (EREV).

Colour preference, naturalness, vividness and colour quality metrics, Part 5: A colour preference experiment at 2000 lx in a real room:

Subjects rated the colour preference of a colourful object scene illuminated to 2000 lx by 28 different spectra from a four-channel LED light engine at different object saturation levels and different white points (3200 K, 4200 K, 5000 K and 5600 K). Mean colour preference ratings had a maximum at a moderate saturation level. The lowest correlated colour temperature (3200 K) exhibited lower preference ratings than the three higher correlated colour temperatures. The influence of saturation level was modelled by existing colour rendition measures and by the measure colour quality combining a colour fidelity index and an overall object colour object saturation measure taken from Part 4 of this work.

Long-term memory color investigation: culture effect and experimental setting factors

Memory colors generated continuous interest in the color community. Previous studies focused on reflecting color chips and color samples in real scenes or on monitors. The cognitive effect of culture was rarely considered. In this paper, we performed a comprehensive investigation of the long-term memory colors of 26 familiar objects using the asymmetric color matching method among Chinese and German observers on a display. Three experiments were conducted to evaluate the variations introduced by culture, context-based gray image, and initial matching color. Memory colors of important objects were collected and representative memory colors were quantified in terms of CIELAB L*, a*, and b* values. The intra- and inter-observer variations were analyzed by mean-color-difference-from-mean values and chromatic ellipses. The effects of different cultural groups and experimental settings were also shown.

The Effectiveness of Colour Appearance Attributes for Enhancing Image Preference and Naturalness

Investigation of image quality on preference and naturalness using 1- dimensional and 2- dimensional colour attributes was performed. Each colour attribute varied in two directions, and each direction had two levels, i.e. large and small. In the present study, paired comparison was employed for image preference and categorical judgement for image naturalness assessment. The aim was to evaluate the performance and effectiveness of 1-dimensional and 2-dimensional colour attributes on image quality. Furthermore, cultural difference, the relationship between image preference and naturalness, the difference between memory colours in colour patches and digital images were examined. The experimental results revealed that the effectiveness of colour attributes on image quality vary with image content.

Strengths and limitations of a uniform 3D-LUT approach for digital camera characterization

Digital color imaging technology has become omnipresent in today’s modern life. Digital image capturing and reproduction devices such as smartphones, digital still and video cameras, displays, printers, and color scanners can be found in every home, offering extremely high functionality and flexibility. In order to guarantee qualitatively good results regarding the whole image processing pipeline and to achieve high user acceptance, optimized color conversion and correction algorithms play a crucial role. In this context, a new implementation method of uniform three-dimensional lookup tables (3D-LUTs) based on a standardized pre-measured spectral reflectance database will be presented and applied for the color correction of digital camera systems. The strengths and limitations of such an implementation will be discussed and a performance comparison with the standard 3×3 matrix color correction will be conducted. It can be found that the proposed 3D-LUT approach outperforms the matrix method in terms ofCIEDE2000 color differences and color reproduction properties, but still has its limitations when it comes to achromatic colors and the representation ofcolor gradients.

Introduction: Remedial Measures and Prevention Works

The session “Remedial Measures and Prevention Works” deals with contributions which are focussed on the scientific background and also practical experiences. Ways of sustainable disaster management and disaster prevention will be demonstrated.

Sound absorption and dispersion in dilute polyatomic gases: a generalized kinetic approach

A generalized kinetic model equation which takes into account the frequency dependence of the thermal conductivity is used to analyze the problem of sound propagation in dilute polyatomic gases. By comparing the theoretical results with some available experimental data we infer that our model equation provides a precise transition between low- and high-frequency limits.