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"Meyer, Kai"
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Arcadia burns
\"When Rosa Alcantara becomes the head of a Sicilian Mafia family, she must contend with her family's sordid past and the secrets that keep haunting the present\"-- Provided by publisher.
Book
Pirate curse
In a place similar to the 1706 Caribbean, two fourteen-year-old \"polliwogs\"--humans who can walk on water--rely on a mysterious figure known as the Ghost Trader and a band of pirates to help them escape from the evil that's chasing them.
Book
Relaxation of dynamically disordered tetragonal platelets in the relaxor ferroelectric \\(0.964\\mathrm{Na}_{1/2}\\mathrm{Bi}_{1/2}\\mathrm{TiO}_3-0.036\\mathrm{BaTiO}_3\\)
The local dynamics of the lead-free relaxor \\(0.964\\mathrm{Na}_{1/2}\\mathrm{Bi}_{1/2}\\mathrm{TiO}_3-0.036\\mathrm{BaTiO}_3\\) (NBT-3.6BT) have been investigated by a combination of quasielastic neutron scattering (QENS) and ab initio molecular dynamics simulations. In a previous paper, we were able to show that the tetragonal platelets in the microstructure are crucial for understanding the dielectric properties of NBT-3.6BT [F. Pforr et al., Phys. Rev. B 94, 014105 (2016)]. To investigate their dynamics, ab initio molecular dynamics simulations were carried out using \\(\\mathrm{Na}_{1/2}\\mathrm{Bi}_{1/2}\\mathrm{TiO}_3\\) with 001 cation order as a simple model system for the tetragonal platelets in NBT-3.6BT. Similarly, 111-ordered \\(\\mathrm{Na}_{1/2}\\mathrm{Bi}_{1/2}\\mathrm{TiO}_3\\) was used as a model for the rhombohedral matrix. The measured single crystal QENS spectra could be reproduced by a linear combination of calculated spectra. We find that the relaxational dynamics of NBT-3.6BT are concentrated in the tetragonal platelets. Chaotic stages, during which the local tilt order changes incessantly on the timescale of several picoseconds, cause the most significant contribution to the quasielastic intensity. They can be regarded as an excited state of tetragonal platelets, whose relaxation back into a quasistable state might explain the frequency dependence of the dielectric properties of NBT-3.6BT in the 100 GHz to THz range. This substantiates the assumption that the relaxor properties of NBT-3.6BT originate from the tetragonal platelets.
Paper
Arcadia awakens
When seventeen-year-old Rosa Alcantara travels from her native Brooklyn to her ancestral home in Sicily, she falls head over heels for Alessandro Carnevare, whose family is the sworn enemy of hers, and must confront both of their families' criminal--and paranormal--pasts.
Book
Positive and negative electrocaloric effect in BaTiO\\(_3\\) in the presence of defect dipoles
The influence of defect dipoles on the electrocaloric effect (ECE) in acceptor doped BaTiO\\(_3\\) is studied by means of lattice-based Monte-Carlo simulations. A Ginzburg-Landau type effective Hamiltonian is used. Oxygen vacancy-acceptor associates are described by fixed defect dipoles with orientation parallel or anti-parallel to the external field. By a combination of canonical and microcanoncial simulations the ECE is directly evaluated. Our results show that in the case of anti-parallel defect dipoles the ECE can be positive or negative depending on the density of defect dipoles. Moreover, a transition from a negative to positive ECE can be observed from a certain density of anti-parallel dipoles on when the external field increases. These transitions are due to the delicate interplay of internal and external fields, and are explained by the domain structure evolution and related field-induced entropy changes. The results are compared to those obtained by MD simulations employing an {\\it{ab initio}} based effective Hamiltonian, and a good qualitative agreement is found. In addition, a novel electrocaloric cycle, which makes use of the negative ECE and defect dipoles, is proposed to enhance the cooling effect.
Paper
Sympatric speciation in Nicaraguan crater lake cichlid fish
Going it alone, together
One of the hottest controversies in evolutionary biology is sympatric speciation, the formation of new species in the absence of geographical boundaries. The controversy is about whether it happens or not: it ‘should’ in theory but it is difficult to prove it. Two new examples of the phenomenon are reported this week, one in fish and one (online) in plants, convincing evidence that as Darwin suggested, sympatric speciation is likely to be common. The fishy example is the formation of
Amphilophus zaliosus
from
A. citrinellus
in a volcanic crater lake in Nicaragua. And in plants, the curly palm
Howea belmoreana
and the thatch palm
H. forsteriana
diverged on Lord Howe Island, a volcanic island 480 km east of Australia in the Tasman Sea.
Sympatric speciation, the formation of species in the absence of geographical barriers, remains one of the most contentious concepts in evolutionary biology. Although speciation under sympatric conditions seems theoretically possible
1
,
2
,
3
,
4
,
5
, empirical studies are scarce and only a few credible examples of sympatric speciation exist
6
. Here we present a convincing case of sympatric speciation in the Midas cichlid species complex (
Amphilophus
sp.) in a young and small volcanic crater lake in Nicaragua. Our study includes phylogeographic, population-genetic (based on mitochondrial DNA, microsatellites and amplified fragment length polymorphisms), morphometric and ecological analyses. We find, first, that crater Lake Apoyo was seeded only once by the ancestral high-bodied benthic species
Amphilophus citrinellus
, the most common cichlid species in the area; second, that a new elongated limnetic species (
Amphilophus zaliosus
) evolved in Lake Apoyo from the ancestral species (
A. citrinellus
) within less than ∼10,000 yr; third, that the two species in Lake Apoyo are reproductively isolated; and fourth, that the two species are eco-morphologically distinct.
Journal Article
أركاديا تحترق : رواية
تعد رواية «أركاديا تحترق»، الجزء الأول من سلسلة فانتازيا ثلاثية، تدور أحداثها حول قصة المراهقة «روزا»، التي تزور عائلتها في صقلية، هربا من مشاكلها في أمريكا، حيث تعيش مع أمها، فتتعرف هناك إلى الشاب «أليساندرو»، لتبدأ قصة حب تجمعهما، ولتكتشف روزا حقائق صادمة عن عائلتها، ليس فقط تورطها بالفساد وبنزاعات المافيا الدموية، وإنما أيضا قدرة أفرادها على التحول إلى حيوانات مفترسة. تبدأ هنا رحلة البحث عن الذات والصراع الداخلي، المتمثل بحتمية تقبل الواقع الجديد، ومواجهة ما ينطوي عليه من تحديات.
BOOK
Cost hierarchies and the pattern of product cost cross-subsidization: Extending a computational model of costing system design
Cost information is critical to ease managers’ decisions in daily business, but its provision is informationally demanding and error prone. Effective design choices for costing systems that can reduce errors are the subject of a growing body of research. The computational model by Anand, Balakrishnan, and Labro (2019) collates previous research in a unifying framework, turning it into a potential standard for future studies. This paper uses this framework and aims to investigate the mechanism behind the well-documented empirical pattern of product cost cross-subsidization in a large-scale simulation experiment. According to this pattern, volume-based costing systems bias the costs of high-volume products upward and of low-volume products downward. Although this pattern has important implications for firms and is discussed extensively in the literature, it has not yet been investigated with computational models. As the first objective of this paper, we replicate the original model by following a pattern-oriented model replication approach. The second objective is to study the mechanism behind the pattern of product cost cross-subsidization. We are unable to reproduce it systematically with the original model. However, the pattern emerges when we extend the model to include a simple cost hierarchy with distinct resource consumption types and volume-based cost drivers. This allows us to specify the likely mechanism behind it. Building on these results, we further extend the model with empirical and theory-based ABC cost hierarchies and assess their effect on product cost cross-subsidization. Our results suggest that production environments underpin more diverse cost hierarchies in practice than previously implemented in the model. Overall, we argue that our extension provides relevant insights into the pattern of product cost cross-subsidization, while our replication and extension strengthen the models’ credibility and usability for future research.
Journal Article