255 research outputs found
Analyzing the transition from just-in-Time to just-in-sequence: A simulation based approach from the automotive sector
Die Auswirkungen des Krieges auf die Einwohnerzahlen in Bosnien und Herzegowina und Kroatien 1991â1998
Na temelju dostupnih izvora te vlastitih procjena, autor u
ovom Älanku raspravlja o utjecaju rata (1991. â 1995.) na
demografske promjene u Bosni i Hercegovini 1991. â 1998.
godine. Pri tome se posebno analizira (demografska)
sudbina Hrvata i daje procjena o veliÄini "izbjegliÄkog
prinosa" na kretanje ukupnog broja stanovnika Hrvatske.Based on available resources and individual estimates the
author of this text discusses the impact of war (1991-1995)
on demographic changes in Bosnia and Herzegovina from
1991-1998. He especially analyses the (demographic) fate
of Croats and assesses the magnitude of the ârefugeesâ
contributionâ to Croatiaâs total population trend.Ausgehend von den zur VerfĂŒgung stehenden Quellen als
auch von eigenen SchÀtzungen erörtert der Verfasser dieses
Artikels die Auswirkungen des Krieges (1991â95) auf die
demographische Lage in Bosnien und Herzegowina
1991â98. Dabei befasst er sich insbesondere mit dem
(demographischen) Schicksal der dort lebenden Kroaten und
gibt SchĂ€tzungen zum AusmaĂ der FlĂŒchtlingswelle, die die
Gesamteinwohnerzahl Kroatiens nachhaltig beeinflusste
The Mediterranean deep-water kelp Laminaria rodriguezii is an endangered species in the Adriatic Sea
Acknowledgments Thanks are due to Klaus LĂŒning for a gametophyte culture of L. abyssalis, and to Britta Schaffelke for a herbarium specimen of L. rodriguezii from the western Mediterranean. We are grateful to the Total Foundation (Paris) for funding this study within the framework of the project âBrown algal ecology and biodiversity in the eastern Mediterranean Seaâ, and to the MASTS pooling initiative (Marine Alliance for Science and Technology for Scotland, funded by the Scottish Funding Council and contributing institutions; grant reference HR09011), as well as Croatian Ministry of Science, Education and Sports for supporting project âBenthic communities in the Adriatic Sea (Project ID: 0001005)â. Open access via Springer Compact AgreementPeer reviewedPublisher PD
The Energy Operator for a Model with a Multiparametric Infinite Statistics
In this paper we consider energy operator (a free Hamiltonian), in the
second-quantized approach, for the multiparameter quon algebras:
with
any hermitian matrix of deformation parameters. We obtain
an elegant formula for normally ordered (sometimes called Wick-ordered) series
expansions of number operators (which determine a free Hamiltonian). As a main
result (see Theorem 1) we prove that the number operators are given, with
respect to a basis formed by "generalized Lie elements", by certain normally
ordered quadratic expressions with coefficients given precisely by the entries
of the inverses of Gram matrices of multiparticle weight spaces. (This settles
a conjecture of two of the authors (S.M and A.P), stated in [8]). These Gram
matrices are hermitian generalizations of the Varchenko's matrices, associated
to a quantum (symmetric) bilinear form of diagonal arrangements of hyperplanes
(see [12]). The solution of the inversion problem of such matrices in [9]
(Theorem 2.2.17), leads to an effective formula for the number operators
studied in this paper. The one parameter case, in the monomial basis, was
studied by Zagier [15], Stanciu [11] and M{\o}ller [6].Comment: 24 pages. accepted in J. Phys. A. Math. Ge
In Situ Observation of Strained Bands and Ductile Damage in Thin AA2139-T3 Alloy Sheets
The interactions between plasticity and damage mechanisms are not clearly established concerning the fracture of ductile sheet materials (e.g., flat to slant transition). The question addressed herein is to elucidate which mechanism is responsible for localized phenomena leading to the final failure. A mechanical test carried out on a notched plate made of 2139-T3 aluminum alloy is imaged thanks to synchrotron laminography at micrometer resolution. Ductile damage (i.e., void nucleation, growth and coalescence) is analyzed via reconstructed volumes. Although the low volume fraction of secondary phases in the tested alloy is challenging, digital volume correlation is also utilized to measure displacement fields and estimate strain fields in the bulk of the alloy during the whole test. In the first part of this study, the resolution of the measurement technique is assessed under such conditions. Then strained bands are shown to occur very early on in what will be the slant region of the fracture path. Conversely, damage grows at very late loading steps
Hierarchically guided in situ nanolaminography for the visualisation of damage nucleation in alloy sheets
Hierarchical guidance is developed for three-dimensional (3D) nanoscale X-ray imaging, enabling identification, refinement, and tracking of regions of interest (ROIs) within specimens considerably exceeding the field of view. This opens up new possibilities for in situ investigations. Experimentally, the approach takes advantage of rapid multiscale measurements based on magnified projection microscopy featuring continuous zoom capabilities. Immediate and continuous feedback on the subsequent experimental progress is enabled by suitable on-the-fly data processing. For this, by theoretical justification and experimental validation, so-called quasi-particle phase-retrieval is generalised to conical-beam conditions, being key for sufficiently fast computation without significant loss of imaging quality and resolution compared to common approaches for holographic microscopy. Exploiting 3D laminography, particularly suited for imaging of ROIs in laterally extended plate-like samples, the potential of hierarchical guidance is demonstrated by the in situ investigation of damage nucleation inside alloy sheets under engineering-relevant boundary conditions, providing novel insight into the nanoscale morphological development of void and particle clusters under mechanical load. Combined with digital volume correlation, we study deformation kinematics with unprecedented spatial resolution. Correlation of mesoscale (i.e. strain fields) and nanoscale (i.e. particle cracking) evolution opens new routes for the understanding of damage nucleation within sheet materials with application-relevant dimensions
Critical behavior of the long-range Ising chain from the largest-cluster probability distribution
Monte Carlo simulations of the 1D Ising model with ferromagnetic interactions
decaying with distance as are performed by applying the
Swendsen-Wang cluster algorithm with cumulative probabilities. The critical
behavior in the non-classical critical regime corresponding to is derived from the finite-size scaling analysis of the largest cluster.Comment: 4 pages, 2 figures, in RevTeX, to appear in Phys. Rev. E (Feb 2001
New records of the rare deep-water alga Sebdenia monnardiana (Rhodophyta) and the alien Dictyota cyanoloma (Phaeophyceae ) and the unresolved case of deep-water kelp in the Ionian and Aegean Seas (Greece)
Parts of the macroalgal flora of the eastern Mediterranean remain incompletely known. This applies in particular to the circalittoral communities. This study, based upon 2 cruises in the Ionian and Aegean Seas, surveyed benthic communities from 40 to 150 m depth by remotely-operated vehicle (ROV) with a special focus on detecting communities of the Mediterranean deep-water kelp Laminaria rodriguezii. These were complemented by shallow-water surveys on adjacent coastlines by snorkelling and scuba diving. While no kelp could be detected at any of the sites surveyed, ROV surveys of northern Euboia Island revealed the first east Mediterranean record of Sebdenia monnardiana (Sebdeniales, Rhodophyta). Snorkelling surveys on the coast of southeast Kefalonia yielded the first record of the alien alga Dictyota cyanoloma in Greece. This paper reports rbcL and SSU sequences for Sebdenia monnardiana, and COI for Dictyota cyanoloma.Peer reviewe
'Turning the tide' on hyperglycemia in pregnancy : insights from multiscale dynamic simulation modeling
INTRODUCTION: Hyperglycemia in pregnancy (HIP, including gestational diabetes and pre-existing type 1 and type 2 diabetes) is increasing, with associated risks to the health of women and their babies. Strategies to manage and prevent this condition are contested. Dynamic simulation models (DSM) can test policy and program scenarios before implementation in the real world. This paper reports the development and use of an advanced DSM exploring the impact of maternal weight status interventions on incidence of HIP. METHODS: A consortium of experts collaboratively developed a hybrid DSM of HIP, comprising system dynamics, agent-based and discrete event model components. The structure and parameterization drew on a range of evidence and data sources. Scenarios comparing population-level and targeted prevention interventions were simulated from 2018 to identify the intervention combination that would deliver the greatest impact. RESULTS: Population interventions promoting weight loss in early adulthood were found to be effective, reducing the population incidence of HIP by 17.3% by 2030 (baseline ('business as usual' scenario)=16.1%, 95%âCI 15.8 to 16.4; population intervention=13.3%, 95%âCI 13.0 to 13.6), more than targeted prepregnancy (5.2% reduction; incidence=15.3%, 95%âCI 15.0 to 15.6) and interpregnancy (4.2% reduction; incidence=15.5%, 95%âCI 15.2 to 15.8) interventions. Combining targeted interventions for high-risk groups with population interventions promoting healthy weight was most effective in reducing HIP incidence (28.8% reduction by 2030; incidence=11.5, 95%âCI 11.2 to 11.8). Scenarios exploring the effect of childhood weight status on entry to adulthood demonstrated significant impact in the selected outcome measure for glycemic regulation, insulin sensitivity in the short term and HIP in the long term. DISCUSSION: Population-level weight reduction interventions will be necessary to 'turn the tide' on HIP. Weight reduction interventions targeting high-risk individuals, while beneficial for those individuals, did not significantly impact forecasted HIP incidence rates. The importance of maintaining interventions promoting healthy weight in childhood was demonstrated
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