cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A Modular Formalization of Reversibility for Concurrent Models and Languages
Creators: name: Bernadet, Alexis
name: Lanese, Ivan
Publisher: name: arXiv
Year: 2016
Subjects: subject: Logic in Computer Science (cs.LO)
subject: Programming Languages (cs.PL)
subject: FOS: Computer and information sciences

description: Causal-consistent reversibility is the reference notion of reversibility for concurrency. We introduce a modular framework for defining causal-consistent reversible extensions of concurrent models and languages. We show how our framework can be used to define reversible extensions of formalisms as different as CCS and concurrent X-machines. The generality of the approach allows for the reuse of theories and techniques in different settings.
description: In Proceedings ICE 2016, arXiv:1608.03131
Magnitude and timing of the giant planet instability: A reassessment from the perspective of the asteroid belt
Creators: name: Toliou, Athanasia
name: Morbidelli, Alessandro
name: Tsiganis, Kleomenis
Publisher: name: arXiv
Year: 2016
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: It is generally accepted today that our solar system has undergone a phase during which the orbits of the giant planets became very unstable. In recent years, many studies have identified traces of this event and have provided reasonable justification for this occurrence. The magnitude (in terms of orbital variation) and the timing of the instability though (early or late with respect to the dispersal of the gas disk) still remains an open debate. The terrestrial planets seem to set a strict constraint: either the giant planet instability happened early, while the terrestrial planets were still forming, or the orbits of Jupiter and Saturn had to separate from each other impulsively, with a large enough `jump' in semimajor axis (Brasser et al. 2009; Kaib and Chambers 2016) for the terrestrial planets to remain stable. Because a large orbital jump is a low probability event, the early instability hypothesis seems to be favored. However, the asteroid belt would also evolve in a different way, assuming different instability amplitudes. These two constraints need to match each other in order to favor one scenario over the other. Considering an initially dynamically cold disk of asteroids, Morbidelli et al. (2010) concluded that a comparably large jump is needed to reconstruct the current asteroid belt. Here we confirm the same conclusion, but considering an asteroid population already strongly excited in eccentricity, such as that produced in the Grand Tack scenario (Walsh et al. 2011). Because the asteroids existed since the time of removal of the gas disk, unlike the terrestrial planets, this constraint on the width of the giant planet jump is valid regardless of whether the instability happened early or late. Hence, at this stage, assuming an early instability does not appear to provide any advantage in terms of the probabilistic reconstruction of the solar system structure.
Incompressible Modes Excited by Supersonic Shear in Boundary Layers: Acoustic CFS Instability
Creators: name: Belyaev, Mikhail
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present an instability for exciting incompressible modes (e.g. gravity or Rossby modes) at the surface of a star accreting through a boundary layer. The instability excites a stellar mode by sourcing an acoustic wave in the disk at the boundary layer, which carries a flux of energy and angular momentum with the opposite sign as the energy and angular momentum density of the stellar mode. We call this instability the acoustic CFS instability, because of the direct analogy to the Chandrasekhar-Friedman-Schutz instability for exciting modes on a rotating star by emission of energy in the form of gravitational waves. However, the acoustic CFS instability differs from its gravitational wave counterpart in that the fluid medium in which the acoustic wave propagates (i.e.\ the accretion disk) typically rotates faster than the star in which the incompressible mode is sourced. For this reason, the instability can operate even for a non-rotating star in the presence of an accretion disk. We discuss applications of our results to high-frequency quasi-periodic oscillations in accreting black hole and neutron star systems and dwarf nova oscillations in cataclysmic variables.
description: 34 pages, 4 figures, submitted to ApJ
Supply Chain Complexity – A Bibliometric Analysis
Creators: name: Mäder, Paul
name: Tiggemann, Jonas
name: Buschmann, Caroline
name: Kamp, Linda
Publisher: name: Universität Bremen
Year: 2020
Subjects: subject: Supply chain complexity
subject: supply chain risk
subject: supply chain performance
subject: intellectual foundation
subject: 380

description: Supply chain (SC) structures become more dynamic and complex with an increasing globality. Complexity in SCs relates to three main dimensions. Spatial, horizontal, and vertical complexity are associated with higher uncertainty and missing transparency in Supply Chain Management (SCM). In modern SCM it is always assumed that the SCs are of global nature and reach across borders into different cultures (Vachon and Klassen, 2002, p. 219). This led to a competitive environment where company networks face each other instead of single firms (Kotzab et al., 2015, pp. 525–526). As there are many definitions of Supply Chain Complexity (SCC) that differ to some extent, the definition that underlines the basic approach of this paper is by. In SCM, SCC is defined as a combination of product, process, and network complexity (Bozarth et al., 2009, p. 80). SCC management is a challenging task for SC managers all over the world. If a company is about to fail at SCC management, negative consequences will be generated. These consequences reach from inconsistent incoming material quality to higher transaction costs and a general inflexibility. It is impossible for SC managers to eliminate complexity which establishes an importance to create an understanding of drivers in SCC, determine, evaluate, and implement strategies to reduce complexity. Higher complexity leads to an overall worse performance in SCM, forming an incentive to manage SCC . To review a research field, bibliometric analysis technique is applied. The analysis brings forth the main achievement in answering the following objectives: a) Providing the intellectual foundation of SCC, i.e. the most impactful articles, authors, institutions, and journals as well as the academic output. b) Providing the interdisciplinary character of SCC.
Kepler Planet Masses and Eccentricities from TTV Analysis
Creators: name: Hadden, Sam
name: Lithwick, Yoram
Publisher: name: arXiv
Year: 2016
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We conduct a uniform analysis of the transit timing variations (TTVs) of 145 planets from 55 Kepler multiplanet systems to infer planet masses and eccentricities. Eighty of these planets do not have previously reported mass and eccentricity measurements. We employ two complementary methods to fit TTVs: Markov chain Monte Carlo simulations based on N-body integration and an analytic fitting approach. Mass measurements of 49 planets, including 12 without previously reported masses, meet our criterion for classification as robust. Using mass and radius measurements, we infer the masses of planets' gaseous envelopes for both our TTV sample as well as transiting planets with radial velocity observations. Insight from analytic TTV formulae allows us to partially circumvent degeneracies inherent to inferring eccentricities from TTV observations. We find that planet eccentricities are generally small, typically a few percent, but in many instances are non-zero.
description: 62 pages, 64 figures, submitted to AAS Journals
FEMSIM+HRMC: Simulation of and Structural Refinement using Fluctuation Electron Microscopy for Amorphous Materials
Creators: name: Maldonis, Jason J.
name: Hwang, Jinwoo
name: Voyles, Paul M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: FEMSIM, a Fortran code, has been developed to simulate the fluctuation electron microscopy signal, the variance, V(k), from a model atomic structure. FEMSIM has been incorporated into a hybrid-reverse Monte Carlo code that combines an embedded atom or Finnis-Sinclair potential with the deviation between simulated and experimental V(k) data to refine an atomic model with structure constrained by both the potential and experimental data. The resulting models have experimentally-derived medium-range order.
description: 14 pages, 3 figures, preprint
Supplier selection in the fashion industry
Creators: name: Huynh, Vivien
name: Neudert, Marlene
name: Rudert, Meike
name: Schewe, Gesa Marieke
name: Wolters, Jantje
Publisher: name: Universität Bremen
Year: 2021
Subjects: subject: Supplier selection
subject: Fashion Industry
subject: Global supply chain
subject: SMART
subject: AHP
subject: MAUT
subject: Analytical Hierarchy Process
subject: PROMETHEE
subject: 380

description: Supplier selection is of particular importance within the field of logistics. It is seen as an essential success factor for every manufacturing company and its entire supply chain network. The choice of the most appropriate supplier can be made by using different processes, which aim to increase the overall benefit, increase customer satisfaction and minimize the product supplier risks. This is also a frequently discussed topic within the fashion industry. The fashion industry is characterized by a constantly changing product range, almost complete dependence on consumers and rising labor costs in emerging countries. Therefore, flexibility and reliability as well as technological conditions play a decisive role in the selection and evaluation of the supplier. Due to the changing preferences of customers new decision-making factors are gaining importance. Besides the economic aspect, the focus is now also on ecological and social aspects. If suppliers do not comply with human rights or ecological standards, this is usually attributed to the company and often causes damage to its image. Therefore, the consideration of environmental and social issues in supplier evaluation plays an important role in the fashion industry. Besides the challenges already mentioned many companies in the fashion industry have found that a supplier who produces cheaply but is far away and difficult to reach has more disadvantages than advantages. Within the last few years, it became clear that for this reason more money had to be spent on quality control, as different standards prevailed in supplier countries. Therefore, they now try to find a balance between local and global procurement and production. In the following paper, this basic information given above will be used to answer the question of which decision-making process for choosing a supplier in the fashion industry leads to the most promising result, taking into account economic, ecological and social goals. In the first step, different processes are presented and analyzed. These processes are SMART and SMARTER, Even Swaps, AHP, MACBETH, MAUT and PROMETHEE, which have been chosen due to their established usage in logistics decision-making. Based on this, a process is selected and implemented. For this purpose, the four stages of supplier selection are carried out: initial supplier qualification, agreement of measurement criteria, obtainment of relevant information and decision.
The relationships among transformational leadership, motivating language, and organizational citizenship behavior
Creators: name: Luca., Elvira
Publisher: name: Monash University
Year: 2021

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Audio history of film: introduction
Creators: name: Pauleit, Winfried
name: Greiner, Rasmus
name: Frey, Mattias
Publisher: name: Universität Bremen
Year: 2018
Subjects: subject: Geschichte
subject: Filmmusik
subject: Filmton
subject: 50

description: The relationship between film and history has assumed many and varied forms over the course of time. During the twentieth century, film increasingly became a medium through which contemporary political and historical events were discussed and interpreted. Cinematic narration of history influenced twentieth-century film production in myriad ways and constantly challenged “classical” historiography, especially its function of disseminating historical knowledge.
Estimation in nonlinear regression with Harris recurrent Markov chains
Creators: name: Li, Degui
name: Tjøstheim, Dag
name: Gao, Jiti
Publisher: name: arXiv
Year: 2016
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics

description: In this paper, we study parametric nonlinear regression under the Harris recurrent Markov chain framework. We first consider the nonlinear least squares estimators of the parameters in the homoskedastic case, and establish asymptotic theory for the proposed estimators. Our results show that the convergence rates for the estimators rely not only on the properties of the nonlinear regression function, but also on the number of regenerations for the Harris recurrent Markov chain. Furthermore, we discuss the estimation of the parameter vector in a conditional volatility function, and apply our results to the nonlinear regression with $I(1)$ processes and derive an asymptotic distribution theory which is comparable to that obtained by Park and Phillips [Econometrica 69 (2001) 117-161]. Some numerical studies including simulation and empirical application are provided to examine the finite sample performance of the proposed approaches and results.
description: Published at http://dx.doi.org/10.1214/15-AOS1379 in the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Unfolding knots by proteasome-like systems: simulations of the behaviour of folded and neurotoxic proteins
Creators: name: Wojciechowski, Michał
name: Gómez-Sicilia, Àngel
name: Carrión-Vázquez, Mariano
name: Cieplak, Marek
Publisher: name: arXiv
Year: 2016
Subjects: subject: Biomolecules (q-bio.BM)
subject: FOS: Biological sciences
subject: 92C40

description: Knots in proteins have been proposed to resist proteasomal degradation. Ample evidence associates proteasomal degradation with neurodegeneration. One interesting possibility is that indeed knotted conformers stall this machinery leading to toxicity. However, although the proteasome is known to unfold mechanically its substrates, at present there are no experimental methods to emulate this particular traction geometry. Here, we consider several dynamical models of the proteasome in which the complex is represented by an effective potential with an added pulling force. This force is meant to induce translocation of a protein or a polypeptide into the catalytic chamber. The force is either constant or applied periodically. The translocated proteins are modelled in a coarse-grained fashion. We do comparative analysis of several knotted globular proteins and the transiently knotted polyglutamine tracts of length 60 alone and fused in exon 1 of the huntingtin protein. Huntingtin is associated with Huntington disease, a well-known genetically-determined neurodegenerative disease. We show that the presence of a knot hinders and sometimes even jams translocation. We demonstrate that the probability to do so depends on the protein, the model of the proteasome, the magnitude of the pulling force, and the choice of the pulled terminus. In any case, the net effect would be a hindrance in the proteasomal degradation process in the cell. This would then yield toxicity \textit{via} two different mechanisms: one through toxic monomers compromising degradation and another by the formation of toxic oligomers. Our work paves the way to the mechanistic investigation of the mechanical unfolding of knotted structures by the proteasome and its relation to toxicity and disease.
description: 13 pages, 9 figures
Worlds of Events: Deduction with Partial Knowledge about Causality
Creators: name: Haeri, Seyed Hossein
name: Van Roy, Peter
name: Baquero, Carlos
name: Meiklejohn, Christopher
Publisher: name: arXiv
Year: 2016
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences
subject: C.2.4 ; F.4.1

description: Interactions between internet users are mediated by their devices and the common support infrastructure in data centres. Keeping track of causality amongst actions that take place in this distributed system is key to provide a seamless interaction where effects follow causes. Tracking causality in large scale interactions is difficult due to the cost of keeping large quantities of metadata; even more challenging when dealing with resource-limited devices. In this paper, we focus on keeping partial knowledge on causality and address deduction from that knowledge. We provide the first proof-theoretic causality modelling for distributed partial knowledge. We prove computability and consistency results. We also prove that the partial knowledge gives rise to a weaker model than classical causality. We provide rules for offline deduction about causality and refute some related folklore. We define two notions of forward and backward bisimilarity between devices, using which we prove two important results. Namely, no matter the order of addition/removal, two devices deduce similarly about causality so long as: (1) the same causal information is fed to both. (2) they start bisimilar and erase the same causal information. Thanks to our establishment of forward and backward bisimilarity, respectively, proofs of the latter two results work by simple induction on length.
description: In Proceedings ICE 2016, arXiv:1608.03131
An analysis on Supply Chain Performance Measurement
Creators: name: Berg, Carina
name: Kern, Marina
name: Pham, Lan Jie
name: Schlemermeyer, Gesa
Publisher: name: Universität Bremen
Year: 2020
Subjects: subject: Supply chain performance
subject: supply chain risk
subject: global supply chain
subject: performance metrics
subject: 380

description: In today’s business processes it has been stated, that a successful supply chain (SC) is a key factor to increase the company’s productivity and profitability and consequently leads to a competitive advantage. This leads to the conclusion that supply chain performance (SCP) needs to be measured to achieve success. The importance of performance measurement for the success of companies has also been emphasized by Santos (2002, p. 1246). Performance measurement is necessary for implementing and realizing strategic goals and further informs the decision makers at the operational, tactical and strategic level (Guanasekaran and Kobu, 2007). In order to maintain the competitive advantage, SCs need to be monitored and underly continuous improvements. Because of these reasons performance measurement and metrics are needed to support the SCP improvement. Through the increasing importance of SCP improvement, different metrics have been examined and developed in the scientific research. As a consequence, a great amount of different kind of metrics have been evolved, including insufficient metrics and a lack of appropriate metrics. Bagchi (1996) identifies 28 metrics, which are categorized in time, quality, cost and diagnostic measures. Gunasekaran et al. (2001) focuses on 18 metrics and links them to the SC activities: plan, source, make/assemble and (customer) delivery. Gunasekaran et al. (2005) suggests 28 performance metrics in new enterprises. Griffis et al. (2004, p. 98) summarize ten metrics, that have been identified as the “most commonly recommended logistics performance measures”. Beamon (1999, p. 281–284) provides exemplary metrics and links them to resources, output and flexibility. Hausman (2002, p. 67–69) classifies the metrics in service, inventory and speed. Furthermore, Gopal and Thakkar (2012, p. 521–522) provide a list, that shows how SCP can be measured in diverse ways. The provided insight into the different metrics shows its broad extent and the differences in its approaches, which makes it difficult to get an overview and a clear fundamental classification. Hence, the research objective of the presented paper deals with the identification of the different categories or core aspects used in the literature. In order to extent the research the second research objective deals with the examination whether the identified literature of the SCP categories show a relation to the terms global supply chain management (SCM), SC complexity and SC risk.
A Common Origin for Globular Clusters and Ultra-faint Dwarfs in Simulations of the First Galaxies
Creators: name: Ricotti, Massimo
name: Parry, Owen H.
name: Gnedin, Nickolay Y.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: In this paper, the first in a series on galaxy formation before reionization, we focus on understanding what determines the size and morphology of stellar objects in the first low mass galaxies, using parsec- scale cosmological simulations performed with an adaptive mesh hydrodynamics code. Although the dense gas in which stars are formed tends to have a disk structure, stars are found in spheroids with little rotation. Halos with masses between 10^6 M_sun and 5x10^8 M_sun form stars stochastically, with stellar masses in the range 10^4 M_sun to 2x10^6 M_sun. Nearly independent of stellar mass, we observe a large range of half-light radii for the stars, from a few parsecs to a few hundred parsecs and surface brightnesses and mass-to-light ratios ranging from those typical of globular clusters to ultra-faint dwarfs. In our simulations, stars form in dense stellar clusters with high gas-to-star conversion efficiencies and rather uniform metallicities. A fraction of these clusters remain bound after the gas is removed by feedback, but others are destroyed, and their stars, which typically have velocity dispersions of 20 to 40 km/s, expand until they become bound by the dark matter halo. We thus speculate that the stars in ultra-faint dwarf galaxies may show kinematic and chemical signatures consistent with their origin in a few distinct stellar clusters. On the other hand, some globular clusters may form at the center of primordial dwarf galaxies and may contain dark matter, perhaps detectable in the outer parts.
description: 15 pages, 12 figure, submitted to ApJ
Decision making on allocation of Covid-19 Vaccines in Africa
Creators: name: Deren, Acay
name: Bagci, Elif
name: Dietrich, Simon
name: Jahandar, Behnam
name: Neumann, Fabian
Publisher: name: Universität Bremen
Year: 2021
Subjects: subject: Resource allocation
subject: epidemic outbreak
subject: vaccine distribution
subject: COVID-19
subject: global supply chain
subject: decision making
subject: 380

description: The COVID-19 pandemic has overwhelmed health systems and hugely influenced economies around the world. An effective and efficient control can only be reached through sustained public health measures and equal access of populations at different income levels to affordable, safe and assured quality vaccines among other health products. The fast track development of Covid-19 vaccines was a great success of modern science, however there have been justified fears that richer countries could hoard the vaccines at the expense of poorer ones. Highlighting inequalities in January, the World Health Organization’s (WHO) head said that more than 39 million doses had been administered in at least 49 higher-income countries, but only 25 in one of the lowest-income countries. Therefore an ambitious international scheme called Covax (Covid-19 Vaccines Global Access Facility) aims to make sure vaccines are shared among the poor and rich countries equally. It was launched in April 2020 and is led by the WHO, together with the Global Vaccine Alliance and the Coalition for Epidemic Preparedness Innovations. A total of 92 low- and middle-income countries and economies will be able to access COVID-19 vaccines through Gavi’s Covax Advance Market Commitment (AMC). At the first phase of the distribution of vaccines to member countries, Covax aims to vaccinate 20% of all country’s populations. Once 20% of population per country is covered (i.e. Tier 1), Phase 2 of the allocation process will gradually expand access to cover a larger portion of the population in all countries. In this study we use the framework of the aforementioned organization to create strategies for allocating resources (vaccine doses) to 3 different regions in Africa because the studies show that cases of the pandemic vary geographically across Africa with notably high incidence in neighboring countries. Therefore, regions have to be prioritized for vaccination rather than countries alone. From this point of view, the problem was considered as a resource allocation problem and the regions were prioritized according to their threat level, health system vulnerabilities and logistics costs. In our model we created 3 different strategies as to address the needs and weaknesses of relative regions. These strategies include the vaccination of a) 10%, b) 20% or c) 30% of a region’s population.
Reduced death anxiety and obsessive beliefs as mediators of the therapeutic effects of psychedelics on obsessive compulsive disorder symptomology
Creators: name: Moreton, Sam G.
name: Burden-Hill, Amber
name: Menzies, Rachel E.
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Medicine
subject: Cell Biology
subject: Neuroscience
subject: Sociology
subject: FOS: Sociology
subject: Science Policy
subject: 111714 Mental Health
subject: FOS: Health sciences

description: Emerging research suggests that the use of serotonergic psychedelics can be associated with reductions in obsessions and compulsions. However, little research to date has attempted to understand why this may be the case. The present study aimed to extend existing research by examining reduced death anxiety and obsessive beliefs as potential mechanisms underpinning the relationship between acute psychedelic effects and reductions in obsessions and compulsions. Participants (N = 312) who had reported having a significant psychedelic experience completed a retrospective survey that measured aspects of their experience as well as changes in death anxiety, obsessive beliefs, and obsessions and compulsions. Acute subjective effects (i.e., mystical experiences; psychological insight) significantly predicted self-reported reductions in (a) obsessive beliefs, (b) death anxiety, and (c) obsessions and compulsions following a psychedelic experience. Mediation analyses evidenced significant indirect effects of mystical experiences, but not psychological insights, on obsessions and compulsions through reduced death anxiety and obsessive beliefs. These findings highlight the links between death anxiety, obsessive beliefs and obsessive-compulsive disorder symptomology, suggesting that reductions in obsessions and compulsions as a result of psychedelic use might, in part, be due to persisting effects of acute psychedelic experiences on these variables. What is already known about this topic: (1) Preliminary evidence suggests that psychedelic experiences may be able to reduce symptoms of obsessive-compulsive disorder (OCD). (2) Psychedelics can change beliefs about the self and attitudes towards death and dying. (3) Obsessive beliefs and death anxiety have been previously linked with OCD symptomology. What this topic adds: (1) Psychedelics may reduce OCD symptomology, obsessive beliefs and death anxiety in some people following a personally meaningful psychedelic experience. (2) Reductions in obsessive beliefs and death anxiety may contribute to reductions in OCD symptomology following meaningful psychedelic experiences. (3) The strength of subjective effects (mystical experience; psychological insight) is related to self-reported reductions in OCD symptomology.
The conditions leading to positive outcomes for members of culturally diverse work teams
Creators: name: Lloyd., Shannon L.
Publisher: name: Monash University
Year: 2021

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Trapped in amber: the new materialities of memory
Creators: name: Elsaesser, Thomas
Publisher: name: Universität Bremen
Year: 2019
Subjects: subject: Gedächtnis
subject: Materialität
subject: Obsoleszenz
subject: Medienarchäologie
subject: Topografie
subject: 50

description: Cinema defies time through its 'uncanny ontology': moving images always document what is not yet dead but also not quite alive, simulacra of life at its most vivid. This unresolvable tension between rewind and replay, between presence and absence, between life preserved and the kingdom of shadows, has profoundly altered our understanding of what history is, just as the same tension between original and copy, between reconstruction and replica, dominates our thinking today about the status of art and historical artifacts, in our post-auratic era that nonetheless craves authenticity and “keeping things real.”
Compositional phase stability of strongly correlated electron materials within DFT+$U$
Creators: name: Isaacs, Eric B.
name: Marianetti, Chris A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Predicting the compositional phase stability of strongly correlated electron materials is an outstanding challenge in condensed matter physics. In this work, we employ the DFT+U formalism to address the effects of local correlations due to transition metal d electrons on compositional phase stability in the prototype phase stable and separating materials LixCoO2 and olivine LixFePO4, respectively. We exploit a new spectral decomposition of the DFT+U total energy, revealing the distinct roles of the filling and ordering of the d orbital correlated subspace. The on-site interaction U drives both of these very different materials systems towards phase separation, stemming from enhanced ordering of the d orbital occupancies in the x=0 and x=1 species, whereas changes in the overall filling of the d shell contribute negligibly. We show that DFT+U formation energies are qualitatively consistent with experiments for phase stable LixCoO2, phase separating LixFePO4, and phase stable LixCoPO4. However, we find that charge ordering plays a critical role in the energetics at intermediate x, strongly dampening the tendency for the Hubbard U to drive phase separation. Most relevantly, the phase stability of Li1/2CoO2 within DFT+U is qualitatively incorrect without allowing charge ordering, which is problematic given that neither charge ordering nor the band gap that it induces are observed in experiment. We demonstrate that charge ordering arises from the correlated subspace interaction energy as opposed to the double counting. Additionally, we predict the Li order-disorder transition temperature for Li1/2CoO2, demonstrating that the unphysical charge ordering within DFT+U renders the method problematic, often producing unrealistically large results. Our findings motivate the need for other advanced techniques, such as DFT+DMFT, for total energies in strongly correlated materials.
Complex angular momenta approach for scattering problems in the presence of both monopoles and short range potentials
Creators: name: Canfora, Fabrizio
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: It is analyzed the quantum mechanical scattering off a topological defect (such as a Dirac monopole) as well as a Yukawa-like potential(s) representing the typical effects of strong interactions. This system, due to the presence of a short-range potential, can be analyzed using the powerful technique of the complex angular momenta which, so far, has not been employed in the presence of monopoles (nor of other topological solitons). Due to the fact that spatial spherical symmetry is achieved only up to internal rotations, the partial wave expansion becomes very similar to the Jacob-Wick helicity amplitudes for particles with spin. However, since the angular-momentum operator has an extra "internal" contribution, fixed cuts in the complex angular momentum plane appear. Correspondingly, the background integral in the Regge formula does not decrease for large values of cos(Theta) (namely, large values of the Mandelstam variable s). Hence, the experimental observation of this kind of behavior could be a direct signal of non-trivial topological structures in strong interactions. The possible relations of these results with the soft Pomeron are shortly analyzed.
description: 25 pages, no figures: Accepted for publication on Physical Review D
RoboPol: Do optical polarization rotations occur in all blazars?
Creators: name: Blinov, D.
name: Pavlidou, V.
name: Papadakis, I.
name: Kiehlmann, S.
name: Liodakis, I.
name: Panopoulou, G. V.
name: Pearson, T. J.
name: Angelakis, E.
name: Baloković, M.
name: Hovatta, T.
name: Joshi, V.
name: King, O. G.
name: Kus, A.
name: Kylafis, N.
name: Mahabal, A.
name: Marecki, A.
name: Myserlis, I.
name: Paleologou, E.
name: Papamastorakis, I.
name: Pazderski, E.
name: Prabhudesai, S.
name: Ramaprakash, A.
name: Readhead, A. C. S.
name: Reig, P.
name: Tassis, K.
name: Zensus, J. A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present a new set of optical polarization plane rotations in blazars, observed during the third year of operation of RoboPol. The entire set of rotation events discovered during three years of observations is analysed with the aim of determining whether these events are inherent in all blazars. It is found that the frequency of the polarization plane rotations varies widely among blazars. This variation cannot be explained either by a difference in the relativistic boosting or by selection effects caused by a difference in the average fractional polarization. We conclude that the rotations are characteristic of a subset of blazars and that they occur as a consequence of their intrinsic properties.
description: 12 pages, 8 figures, accepted by MNRAS
The Feedback Effect of Economic Conditions on Outward FDI Policy
Creators: name: Utesch-Xiong, Fredrik
Publisher: name: Universität Bremen
Year: 2021
Subjects: subject: FDI Policies
subject: Outward FDI
subject: Home country government
subject: Policy change
subject: Industrial development
subject: Macroeconomic stability
subject: China
subject: 330

description: This paper studies the role of developments in firm internationalization, industrial catch-up, and macroeconomic home country stability on reactive outward foreign direct investment (OFDI) policymaking in an emerging market context. Drawing on theoretical policy change approaches of political science, I contend that the size of the developments that risk China’s economic stability is an essential factor for causing reactive OFDI policymaking. Studying the period of 1999 to 2019, this paper finds that while drastic changes on the firm, industry and macroeconomic level lead to reactive OFDI policymaking, it is only on the firm level where continuous change matters for policymakers.
Three essays on competition and regulation of mobile telecommunications networks
Creators: name: Liu., Yan
Publisher: name: Monash University
Year: 2021

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
A Step Towards Checking Security in IoT
Creators: name: Bodei, Chiara
name: Degano, Pierpaolo
name: Ferrari, Gian-Luigi
name: Galletta, Letterio
Publisher: name: arXiv
Year: 2016
Subjects: subject: Programming Languages (cs.PL)
subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences
subject: F.3.2;D.2.4

description: The Internet of Things (IoT) is smartifying our everyday life. Our starting point is IoT-LySa, a calculus for describing IoT systems, and its static analysis, which will be presented at Coordination 2016. We extend the mentioned proposal in order to begin an investigation about security issues, in particular for the static verification of secrecy and some other security properties.
description: In Proceedings ICE 2016, arXiv:1608.03131
Variable-temperature solid-state NMR analysis of woody materials in the presence of small hydroxyl molecules
Creators: name: Nishida, Masakazu
name: Abe, Mitsuru
name: Seki, Masako
name: Miki, Tsunehisa
name: Sugimoto, Hiroyuki
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Biophysics
subject: Biochemistry
classificationCode: 29999
subject: Physical Sciences not elsewhere classified
subject: Molecular Biology
classificationCode: 39999
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: FOS: Biological sciences
classificationCode: 110309
subject: Infectious Diseases
subject: FOS: Health sciences

description: Interactions between the hierarchical structure of Japanese cypress and small hydroxylic solvents with high polarity were studied using variable-temperature 13C cross-polarization and magic-angle spinning nuclear magnetic resonance (CP/MAS) NMR spectroscopy, including low-temperature measurements. 13C CP/MAS NMR spectra were enhanced by dipolar interactions closely related to 1H–13C magnetization transfer, providing information about the interaction between woody materials and small hydroxyl molecules. The change in interaction was particularly near the melting point of the hydroxylic solvent, where a decrease in the intensity of the cypress carbohydrate signal and the appearance of the signal of solvent molecules were observed. The trend of signal intensity in the variable-temperature 13C CP/MAS NMR spectra of cypress and cellulose fibers in the presence of hydroxylic solvents indicated that the decrease in the carbohydrate signal intensity due to the transfer of magnetization near the melting point of the hydroxyl molecule is greater when the size of the hydroxyl molecule is smaller. Furthermore, molecular association in the nanopores of the hierarchical structure allowed the hydroxyl molecular signals of the impregnated cypress to appear above the melting point.
Regenerative Soot-I: Carbon cluster formation in regenerative sooting plasmas
Creators: name: Ahmad, Shoaib
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Laboratory formation of large carbon clusters with m C atoms where m could be up to few thousand, in carbonaceous plasma, has been studied by using an especially designed ion source. Carbon is introduced into the glow discharge plasma by sputtering of the graphite electrode. Soot dominated plasma is created whose constituents are carbon clusters. It produces and recycles cluster containing plasma. Regenerative sooting plasma creates the environment in which the entire spectrum of clusters that contain the linear chains, rings and fullerenes. Velocity spectra of the extracted clusters have been measured with an ExB filter. These spectra indicate and identify the mechanisms operating in the soot.
description: 9 pages, 4 figures
On the Resilience of Scalar and Vector Vortex Modes in Turbulence
Creators: name: Cox, Mitchell A.
name: Rosales-Guzmán, Carmelo
name: Lavery, Martin P. J.
name: Versfeld, Daniel J.
name: Forbes, Andrew
Publisher: name: arXiv
Year: 2016
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Free-space optical communication with spatial modes of light has become topical due to the possibility of dramatically increasing communication bandwidth via Mode Division Multiplexing (MDM). While both scalar and vector vortex modes have been used as transmission bases, it has been suggested that the latter is more robust in turbulence. Using orbital angular momentum as an example, we demonstrate theoretically and experimentally that the crosstalk due to turbulence is the same in the scalar and vector basis sets of such modes. This work brings new insights about the behaviour of vector and scalar modes in turbulence, but more importantly it demonstrates that when considering optimal modes for MDM, the choice should not necessarily be based on their vectorial nature.
Säkulares Luxemburg? Entstehung und Auswirkungen eines Säkularisierungsprozesses
Creators: name: Lambert, Liz
Publisher: name: Universität Bremen
Year: 2020
Subjects: subject: Säkularisierung
subject: Religion
subject: Luxemburg
subject: Religion und Politik
subject: 200

description: Im Großherzogtum Luxemburg stand im Laufe des letzten Jahrzehntes insbesondere ein Thema im Mittelpunkt vieler politischer und gesellschaftlicher Debatten: die Trennung von Staat und Religion. Mit dem Argument, den Interessen und der Pluralität der luxemburgischen Gesellschaft gerecht zu werden, wurde die Säkularisierung vor allem durch die 2013 gewählte Regierung Bettel-SchneiderI erheblich vorangetrieben. Liz Lambert analysiert einzelne Aspekte dieses Säkularisierungsprozesses, indem sie erstens einen historischen Abriss der diesbezüglichen Entwicklungen seit der Zeit Napoleons darlegt, zweitens eine Analyse der jüngeren Entwicklungen (Regierungswechsel von 2013 und Abkommen von 2015) anstellt und drittens darauf eingeht, wie sich dieser Prozess auf die religiösen Institutionen sowie die freigeistigen Vereine ausgewirkt hat.
Examining the Accuracy of Astrophysical Disk Simulations With a Generalized Hydrodynamical Test Problem
Creators: name: Raskin, Cody
name: Owen, J. Michael
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We discuss a generalization of the classic Keplerian disk test problem allowing for both pressure and rotational support, as a method of testing astrophysical codes incorporating both gravitation and hydrodynamics. We argue for the inclusion of pressure in rotating disk simulations on the grounds that realistic, astrophysical disks exhibit non-negligible pressure support. We then apply this test problem to examine the performance of various smoothed particle hydrodynamics (SPH) methods incorporating a number of improvements proposed over the years to help SPH better address problems noted in modeling the classical gravitation only Keplerian disk. We also apply this test to a newly developed extension of SPH based on reproducing kernels called CRKSPH. Counterintuitively, we find that pressure support worsens the performance of traditional SPH on this problem, causing unphysical collapse away from the steady-state disk solution even more rapidly than the purely gravitational problem, whereas CRKSPH greatly reduces this error.
description: 13 pages, 12 figures, ApJ in review
Optimal Multi-Objective Capacity Enhancement and Energy Efficient HetNet Planning and Deployment Approach: The Case of Addis Ababa, Ethiopia
Creators: name: Habtamu, Abayneh
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2019

description: Following growth in infrastructure, number of subscribers and availability of smart devices and applications, the aggregate cellular data traffic in Addis Ababa city's cellular network is increasing exponentially. Moreover, traffic growth follows non-uniform distribution both in space and time. To accommodate this non-uniformly growing data traffic, ethio telecom, for now, the sole telecom service provider in the city, deploy single-layer homogeneous macro base stations (MBSs). Macro-cell densification has been used to increase capacity of the radio access network (RAN). However, excess densification increases the RAN energy consumption, which is becoming a concern for cellular network operators like ethio telecom. Deploying small cells overlaid with macro BSs, named as the heterogeneous network (HetNet), is an energy-efficient (EE) approach capable of meeting the high capacity demand and also keeps network deployment costs low. Many studies have analyzed the HetNet planning and deployment scenario. However, user usage scenarios and their mobility pattern based on realistic data are not considered for the selection of initial small cell candidate locations. Their results differ from one another depending on the environment, cell size, data set, and technology, or the methodology on which the research is made. This research investigates a genetic algorithm (GA) based multi-objective optimization based on system capacity and EE maximization to provide a set of optimal solutions for HetNet selection. In doing so, based on a dataset collected from Addis Ababa cellular network, existing macro BSs data traffic, user usage scenarios, and spatial data traffic demand distribution are generated to identify hotspot areas, and are given as input parameters for the GA for optimal small cell selection. Then, layered planning and deployment is carried out in an interference-limited LongTerm Evolution (LTE) network based on the target requirement. Finally, performance gain of the optimized layered approach is evaluated with system capacity and EE as performance metrics and compared with a uniform topology which is resulted from unplanned small cell deployment through network simulation tool. The simulation results mainly show that both EE (up to 22%) and up to 16% capacity gain with cell edge performance gain (52%) of the target area are, improved by the deployment of optimized small cells, over the uniform (unplanned) deployment.
The Authenticity feeling: language and dialect in the historical film
Creators: name: Frey, Mattias
Publisher: name: Universität Bremen
Year: 2018
Subjects: subject: Authentizität
subject: Dialekt
subject: Geschichtsfilm
subject: Sprache
subject: 50

description: The pursuit of authenticity is film’s dominant mode of historical representation. For the overwhelming majority of historical film makers and audiences, authenticity signifies a realistic historical experience, an effective suspension of temporal-spatial disbelief. Authenticity, as the engine of mainstream historical filmmaking, has three chief functions: as an aesthetic strategy, a reception discourse and a marketing discourse.
Two approaches to trade, development and import protection
Creators: name: Liu., Meng-Chun
Publisher: name: Monash University
Year: 2021

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
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