cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Quantum dynamics of impurities coupled to a Fermi sea
Creators: name: Parish, Meera
name: Levinsen, Jesper
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We consider the dynamics of an impurity atom immersed in an ideal Fermi gas at zero temperature. We focus on the coherent quantum evolution of the impurity following a quench to strong impurity-fermion interactions, where the interactions are assumed to be short range like in cold-atom experiments. To approximately model the many-body time evolution, we use a truncated basis method, where at most two particle-hole excitations of the Fermi sea are included. When the system is initially non-interacting, we show that our method exactly captures the short-time dynamics following the quench, and we find that the overlap between initial and final states displays a universal non-analytic dependence on time in this limit. We further demonstrate how our method can be used to compute the impurity spectral function, as well as describe many-body phenomena involving coupled impurity spin states, such as Rabi oscillations in a medium or highly engineered quantum quenches.
description: 14 pages, 9 figures
Architecting Time-Critical Big-Data Systems
Creators: name: Basanta-Val, Pablo
name: Audsley, Neil
name: Wellings, Andy
name: Gray, Ian
name: Fernandez, Norberto
Publisher: name: arXiv
Year: 2016
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: - Current infrastructures for developing big-data applications are able to process --via big-data analytics-huge amounts of data, using clusters of machines that collaborate to perform parallel computations. However, current infrastructures were not designed to work with the requirements of time-critical applications; they are more focused on general-purpose applications rather than time-critical ones. Addressing this issue from the perspective of the real-time systems community, this paper considers time-critical big-data. It deals with the definition of a time-critical big-data system from the point of view of requirements, analyzing the specific characteristics of some popular big-data applications. This analysis is complemented by the challenges stemmed from the infrastructures that support the applications, proposing an architecture and offering initial performance patterns that connect application costs with infrastructure performance.
description: in IEEE Transactions on Big Data, 2016
Coherent cyclotron motion beyond Kohn's theorem
Creators: name: Maag, T.
name: Bayer, A.
name: Baierl, S.
name: Hohenleutner, M.
name: Korn, T.
name: Schüller, C.
name: Schuh, D.
name: Bougeard, D.
name: Lange, C.
name: Mootz, R. Huber M.
name: Sipe, J. E.
name: Koch, S. W.
name: Kira, M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: In solids, the high density of charged particles makes many-body interactions a pervasive principle governing optics and electronics[1-12]. However, Walter Kohn found in 1961 that the cyclotron resonance of Landau-quantized electrons is independent of the seemingly inescapable Coulomb interaction between electrons[2]. While this surprising theorem has been exploited in sophisticated quantum phenomena[13-15] such as ultrastrong light-matter coupling[16], superradiance[17], and coherent control[18], the complete absence of nonlinearities excludes many intriguing possibilities, such as quantum-logic protocols[19]. Here, we use intense terahertz pulses to drive the cyclotron response of a two-dimensional electron gas beyond the protective limits of Kohn's theorem. Anharmonic Landau ladder climbing and distinct terahertz four- and six-wave mixing signatures occur, which our theory links to dynamic Coulomb effects between electrons and the positively charged ion background. This new context for Kohn's theorem unveils previously inaccessible internal degrees of freedom of Landau electrons, opening up new realms of ultrafast quantum control for electrons.
A radial age gradient in the geometrically thick disk of the Milky Way
Creators: name: Martig, Marie
name: Minchev, Ivan
name: Ness, Melissa
name: Fouesneau, Morgan
name: Rix, Hans-Walter
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: In the Milky Way, the thick disk can be defined using individual stellar abundances, kinematics, or age; or geometrically, as stars high above the mid-plane. In nearby galaxies, where only a geometric definition can be used, thick disks appear to have large radial scale-lengths, and their red colors suggest that they are uniformly old. The Milky Way's geometrically thick disk is also radially extended, but it is far from chemically uniform: alpha-enhanced stars are confined within the inner Galaxy. In simulated galaxies, where old stars are centrally concentrated, geometrically thick disks are radially extended, too. Younger stellar populations flare in the simulated disks' outer regions, bringing those stars high above the mid-plane. The resulting geometrically thick disks therefore show a radial age gradient, from old in their central regions to younger in their outskirts. Based on our age estimates for a large sample of giant stars in the APOGEE survey, we can now test this scenario for the Milky Way. We find that the geometrically-defined thick disk in the Milky Way has indeed a strong radial age gradient: the median age for red clump stars goes from ~9 Gyr in the inner disk to 5 Gyr in the outer disk. We propose that at least some nearby galaxies could also have thick disks that are not uniformly old, and that geometrically thick disks might be complex structures resulting from different formation mechanisms in their inner and outer parts.
description: 6 pages, 4 figures. Accepted for publication in ApJ
Biological dose representation for carbon-ion radiotherapy of unconventional fractionation
Creators: name: Kanematsu, Nobuyuki
name: Inaniwa, Taku
Publisher: name: arXiv
Year: 2016
Subjects: subject: Medical Physics (physics.med-ph)
subject: FOS: Physical sciences

description: In carbon-ion radiotherapy, single-beam delivery each day in alternate directions has been commonly practiced for operational efficiency, taking advantage of the Bragg peak and the relative biological effectiveness (RBE) for uniform dose conformation to a tumor. The treatment plans are usually evaluated with total RBE-weighted dose, which is however deficient in relevance to the biological effect in the linear-quadratic model due to its quadratic-dose term, or the dose-fractionation effect. In this study, we reformulate the extrapolated response dose (ERD), or synonymously BED, which normalizes the dose-fractionation and cell-repopulation effects as well as the RBE of treating radiation, based on inactivation of a single model cell system and a typical treating radiation in carbon-ion RT. The ERD distribution virtually represents the biological effect of the treatment regardless of radiation modality or fractionation scheme. We applied the ERD formulation to simplistic model treatments and to a preclinical survey for hypofractionation based on an actual prostate-cancer treatment of carbon-ion radiotherapy. The proposed formulation was demonstrated to be practical and to offer theoretical implications. In the prostate-cancer case, the ERD distribution was very similar to the RBE-weighted-dose distribution of the actual treatment in 12 fractions. With hypofractionation, while the RBE-weighted-dose distribution varied significantly, the ERD distribution was nearly invariant, implying that the carbon-ion radiotherapy would be insensitive to fractionation. However, treatment evaluation with simplistic biological dose is intrinsically limited and must be complemented in practice somehow by clinical experiences and biology experiments.
Explicit Solving of the System of Natural PDE's of Minimal Surfaces in the Four-Dimensional Euclidean Space
Creators: name: Ganchev, Georgi
name: Kanchev, Krasimir
Publisher: name: arXiv
Year: 2016
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: J.2.8
subject: 53A10, 53A05

description: The fact that minimal surfaces in the four-dimensional Euclidean space admit natural parameters implies that any minimal surface is determined uniquely up to a motion by two curvature functions, satisfying a system of two PDE's (the system of natural PDE's). In fact this solves the problem of Lund-Regge for minimal surfaces. Using the corresponding result for minimal surfaces in the three-dimensional Euclidean space, we solve explicitly the system of natural PDE's, expressing any solution by virtue of two holomorphic functions in the Gauss plane. We find the relation between two pairs of holomorphic functions (i.e. the class of pairs of holomorphic functions) generating one and the same solution of the system of natural PDE's.
description: 6 pages
title: Maximising efficiencies in CCS projects through produced brine use in Australia
Creators: name: C., Patterson
name: C., Patterson
name: A., Kalinowski
name: E., Tenthorey
Publisher: name: Commonwealth of Australia (Geoscience Australia)
Year: 2023
Subjects: subject: EARTH SCIENCES
subject: CCS
subject: carbon capture and storage
subject: EFTF - Exploring for the Future
subject: Low carbon
subject: Australia's Future Energy Resources
subject: Published_External

description: Internationally, the number of carbon capture and storage (CCS) projects has been increasing with more than 61 new CCS facilities added to operations around the globe in 2022, including six projects in Australia (GCCSI, 2022). The extraction of reservoir fluid will be an essential component of the CCS workflow for some of projects in order to manage reservoir pressure variations and optimise the subsurface storage space. While we refer to reservoir fluid as brine throughout this paper for simplicity, reservoir fluids can range from brackish to more saline (briny) water. Brine management requires early planning, as it has implications for the project design and cost, and can even unlock new geological storage space in optimal locations. Beneficial use and disposal options for brine produced as a result of carbon dioxide (CO2) storage has been considered at a regional or national scale around the world, but not yet in Australia. For example, it may be possible to harvest energy, water, and mineral resources from extracted brine. Here, we consider how experiences in brine management across other Australian industries can be transferred to domestic CCS projects.
T. Kalpakchiev et al. - Towards Political Salience of Phosphorus (Frames) - Environmental Politics.xlsx
Creators: name: Kalpakchiev, Teodor
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 440704
subject: Environment policy
classificationCode: 300210
subject: Sustainable agricultural development
classificationCode: 440404
subject: Political economy and social change

description: RecaP will address the changing Phosphorus (P) needs by creating a new generation of P specialists to become 'knowledge brokers' across disciplinary silos.
title: Evaluating the economic potential for carbon sequestration projects
Creators: name: A., Kalinowski
name: S.D.C., Walsh
name: A., Kalinowski
name: C., Patterson
name: E., Tenthorey
name: M., Haynes
Publisher: name: Commonwealth of Australia (Geoscience Australia)
Year: 2023
Subjects: subject: EARTH SCIENCES
subject: Carbon Sequestration Science
subject: Economic Models and Forecasting
subject: EFTF - Exploring for the Future
subject: CCS
subject: Carbon capture and storage
subject: Australia's Future Energy Resources
subject: Published_External

description: Carbon capture and storage (CCS) is a central component of many proposed pathways to reach net zero CO2 emissions by 2050. Even under conservative estimates, successful deployment of CCS projects at scale will require a substantial investment in the selection and development of new sequestration sites. While several studies have considered the potential costs associated with individual sequestration projects, and others have evaluated the costs of capture and sequestration in a generic manner, few have examined how regional differences in transport distances and reservoir properties may affect the overall costs of sequestration projects. In this abstract, we outline a new model to assess the costs associated with new carbon sequestration projects. The model evaluates the cost of CCS projects accounting for regional variations in transport distance and cost and well the storage properties of individual reservoirs. We present preliminary results from the modelling tool, highlighting potential opportunities for new CCS projects.
title: The Heavy Mineral Map of Australia: vision, implementation and progress
Creators: name: P., de Caritat
name: P., de Caritat
name: A.T., Walker
name: E., Bastrakov
name: B.I.A, McInnes
Publisher: name: Commonwealth of Australia (Geoscience Australia)
Year: 2023
Subjects: subject: GEOCHEMISTRY
subject: EFTF - Exploring for the Future
subject: Australia's Resources Framework
subject: Heavy Mineral Map
subject: Published_External

description: Heavy minerals (HMs) have been used successfully around the world in energy and mineral exploration, yet in Australia no public domain database or maps exist that document the background HM assemblages or distributions. Here, we describe a project that delivers the world’s first continental-scale HM maps. We applied automated mineralogical identification and quantification of the HMs contained in floodplain sediments from large catchments covering most of Australia. The composition of the sediments reflects the dominant rock types in each catchment, with the generally resistant HMs largely preserving the mineralogical fingerprint of their host protoliths through the weathering–transport–deposition cycle. Underpinning this vision was a pilot project, based on 10 samples from the national sediment sample archive, which in 2020 demonstrated the feasibility of a larger, national-scale project. Two tranches of the subsequent national HM dataset, one focusing on a 965,000 km2 region centred on Broken Hill in southeastern Australia, the other focusing on a 950,000 km2 area in northern Queensland and Northern Territory, were released in 2022. In those releases, over 47 million mineral grains were analysed in 411 samples, identifying over 150 HM species. We created a bespoke, cloud-based mineral network analysis (MNA) tool to visualize, explore and discover relationships between HMs as well as between them and geological settings or mineral deposits. We envisage that the Heavy Mineral Map of Australia and MNA tool, when released publicly by the end of 2023, will contribute significantly to mineral prospectivity analysis and modelling, particularly for technology critical elements and their host minerals Citation: Caritat P. de, Walker A.T., Bastrakov E. & McInnes B.I.A., 2023. From The Heavy Mineral Map of Australia: vision, implementation and progress. In: Czarnota, K. (ed.) Exploring for the Future: Extended Abstracts, Geoscience Australia, Canberra, https://dx.doi.org/10.26186/148678
A Decolonial Approach to Knowledge-Sharing. The First Subject Repository for International Cultural Relations
Creators: name: Schmidt, Nora
Publisher: name: Zenodo
Year: 2023
Subjects: Open Access
Subject Repositories
Decolonisation
International Cultural Relations

description: A planned open-access knowledge-sharing platform for the field of international cultural relations forms the grounds for a study that was presented. The production of knowledge in this field takes place globally in different types of institutions: academic, educational, political, and economic. The communities of practice produce formal publications, but also so-called "grey literature" which is often hard to discover and preserve. A subject repository on the Web can tackle these issues. Subject repositories have been established since the early 1990s, pioneering the Open Access movement, making relevant documents available as a collection to meet the information needs of subject experts and the interested public. However, these repositories are still exclusively operated in the "Global North". Can they meet the global diversity of requirements? How can these platforms be managed with cultural humility? As a result of the study, a recommendation matrix was developed which tackles the most important issues: balancing "Global North" privileges by subtraction instead of just adding diversity, working towards social justice by involving the communities of practice from the very start, setting up a polycentric governance structure based on values defined by the communities, establishing ethics of care and translation processes to mediate different roles and accommodate individual needs, supporting multilingualism, low connectivity environments, interoperability, and experiments, all with a critical stance towards standardisation and rationalisation, planning sustainably for the long term, collaborating and cooperating, doing everything transparently, at a moderate pace, learning humbly and perpetually.
description: The background image of the title slide is by Lars H. Rohwedder (cut, blurred and darkened), used under the same license as the presentation is published.
Planck's Dusty GEMS. II. Extended [CII] emission and absorption in the Garnet at z=3.4 seen with ALMA
Creators: name: Nesvadba, N.
name: Kneissl, R.
name: Canameras, R.
name: Boone, F.
name: Falgarone, E.
name: Frye, B.
name: Gerin, M.
name: Koenig, S.
name: Lagache, G.
name: Floc'h, E. Le
name: Malhotra, S.
name: Scott, D.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present spatially resolved ALMA [CII] observations of the bright (flux density S=400 mJy at 350 microns), gravitationally lensed, starburst galaxy PLCK G045.1+61.1 at z=3.427, the "Garnet". This source is part of our set of "Planck's Dusty GEMS", discovered with the Planck's all-sky survey. Two emission-line clouds with a relative velocity offset of ~600 km/s extend towards north-east and south-west, respectively, of a small, intensely star-forming clump with a star-formation intensity of 220 Msun/yr/kpc^2, akin to maximal starbursts. [CII] is also seen in absorption, with a redshift of +350 km/s relative to the brightest CO component. [CII] absorption has previously only been found in the Milky Way along sightlines toward bright high-mass star-forming regions, and this is the first detection in another galaxy. Similar to Galactic environments, the [CII] absorption feature is associated with [CI] emission, implying that this is diffuse gas shielded from the UV radiation of the clump, and likely at large distances from the clump. Since absorption can only be seen in front of a continuum source, the gas in this structure can definitely be attributed to gas flowing towards the clump. The absorber could be part of a cosmic filament or merger debris being accreted onto the galaxy. We discuss our results also in light of the on-going debate of the origin of the [CII] deficit in dusty star-forming galaxies.
description: A&A 593, L2
Dataset and code: Predicting potential range shifts using climatic time series and niche models: A Neotropical montane shrew's case
Creators: name: Pinilla-Buitrago, Gonzalo E.
Publisher: name: Zenodo
Year: 2023

description: Data and code of: Pinilla-Buitrago, G.E. 2023. Predicting potential range shifts using climatic time series and niche models: A Neotropical montane shrew's case. Ecological Informatics. https://doi.org/10.1016/j.ecoinf.2023.102212
Soft McEliece: MDPC code-based McEliece cryptosystems with very compact keys through real-valued intentional errors
Creators: name: Baldi, Marco
name: Santini, Paolo
name: Chiaraluce, Franco
Publisher: name: arXiv
Year: 2016
Subjects: subject: Information Theory (cs.IT)
subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: We propose to use real-valued errors instead of classical bit flipping intentional errors in the McEliece cryptosystem based on moderate-density parity-check (MDPC) codes. This allows to exploit the error correcting capability of these codes to the utmost, by using soft-decision iterative decoding algorithms instead of hard-decision bit flipping decoders. However, soft reliability values resulting from the use of real-valued noise can also be exploited by attackers. We devise new attack procedures aimed at this, and compute the relevant work factors and security levels. We show that, for a fixed security level, these new systems achieve the shortest public key sizes ever reached, with a reduction up to 25% with respect to previous proposals.
description: 5 pages, 1 figure, to be presented at IEEE ISIT 2016
PageRank in Malware Categorization
Creators: name: Kang, BooJoong
name: Yerima, Suleiman Y.
name: McLaughlin, Kieran
name: Sezer, Sakir
Publisher: name: arXiv
Year: 2016
Subjects: subject: Cryptography and Security (cs.CR)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: In this paper, we propose a malware categorization method that models malware behavior in terms of instructions using PageRank. PageRank computes ranks of web pages based on structural information and can also compute ranks of instructions that represent the structural information of the instructions in malware analysis methods. Our malware categorization method uses the computed ranks as features in machine learning algorithms. In the evaluation, we compare the effectiveness of different PageRank algorithms and also investigate bagging and boosting algorithms to improve the categorization accuracy.
description: In RACS:Proceedings of the 2015 Conference on Research in Adaptive and Convergent Systems. (pp. 291-295). Czech Republic: Association for Computing Machinery (ACM)
title: Relational databases for geoscience data: HYDROCHEM, a case study.
Creators: name: S., Hawkins
name: S., Hawkins
Publisher: name: Commonwealth of Australia (Geoscience Australia)
Year: 2023
Subjects: subject: PHYSICAL SCIENCES
subject: BUILT ENVIRONMENT AND DESIGN
subject: EARTH SCIENCES
subject: ENVIRONMENTAL SCIENCES
subject: TECHNOLOGY
subject: Hydrochemistry
subject: HVC_144638
subject: EFTF - Exploring For The Future
subject: Hydrogeochemistry
subject: Databases
subject: Data
subject: Enhanced Data Delivery
subject: Published_External

description: Millions of data points have been acquired or compiled through both phases of the Exploring for the Future (EFTF) program at Geoscience Australia (GA). This data that graces the EFTF Portal and appears in many publications has another home within specialist databases designed and built to house the specific data that GA collects. One such database is HYDROCHEM, which was implemented as part of the Enhanced Data Delivery (EDD) and National Groundwater Systems (NGS) projects. HYDROCHEM hosts 190,097 rows of groundwater, surface water and rainfall water chemistry analyses. This data was either previously hosted in the GNDWATER database, or compiled from legacy data stores. The redevelopment of GNDWATER to HYDROCHEM saw the de-duplication and updating of sample and site-specific metadata into other GA databases, such as SAMPLES, BOREHOLES and FIELDSITES. The redevelopment also added additional constraints to the database, including minimum metadata requirements, constrained look-up tables for units of measure, laboratory, method, filter sizes, standards and uncertainty types. Other features include minimum and maximum values for particular analytes and delivery of the data in standardised GA-preferred units of measure.
Food Quality - The Solution?
Creators: name: Ward, Simon
name: Ward, Simon
Publisher: name: Unknown
Year: 2020
Subjects: subject: Food Consumption/Nutrition/Food Safety
subject: Research and Development/Tech Change/Emerging Technologies
subject: food quality
subject: tariffs
subject: innovation

description: Tariffs and trade barriers not only fail to ensure the highest food quality but also reduce opportunities for producer innovation. While the government has an important role in ensuring food safety, other aspects associated with food quality are better managed through labelling, allowing consumers to judge food quality on their own terms. In order to respond to opportunities created by a reduction in tariffs and focus on new food quality drivers the creation of farmer controlled innovation hubs is proposed.
Born Dry in the Photo-Evaporation Desert: Kepler's Ultra-Short-Period Planets Formed Water-Poor
Creators: name: Lopez, Eric D.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Recent surveys have uncovered an exciting new population of ultra-short-period (USP) planets with orbital periods less than a day. These planets typically have radii <1.5 Earth radii, indicating that they likely have rocky compositions. This stands in contrast to the overall distribution of planets out to ~100 days, which is dominated by low-density sub-Neptunes above 2 Earth radii, which must have gaseous envelopes to explain their size. However, on ultra-short-period orbits, planets are bombarded by intense levels of photo-ionizing radiation and consequently gaseous sub-Neptunes are extremely vulnerable to losing their envelopes to atmospheric photo-evaporation. Using models of planet evolution, I show that the rocky USP planets can easily be produced as the evaporated remnants of sub-Neptunes with H/He envelopes and that we can therefore understand the observed dearth of USP sub-Neptunes as a natural consequence of photo-evaporation. Critically however, planets on USP orbits could often retain their envelopes if they formed with very high-metallicity water dominated envelopes. Such water-rich planets would commonly be >2 Earth radii today, which is inconsistent with the observed evaporation desert, indicating that most USP planets likely formed from water-poor material within the snow-line. Finally, I examine the special case of 55 Cancri e and its possible composition in the light of recent observations, and discuss the prospects for further characterizing this population with future observations.
description: 10 pages, 5 figures, submitted to MNRAS on 9/30/2016
Mixing in modulated turbulence. Analytical results
Creators: name: Bos, Wouter
name: Rubinstein, Robert
Publisher: name: arXiv
Year: 2016
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Recent numerical results show that if a scalar is mixed by periodically forced turbulence, the average mixing rate is directly affected for forcing frequencies small compared to the integral turbulence frequency. We elucidate this by an analytical study using simple turbulence models for spectral transfer. Adding a large amplitude modulation to the forcing of the velocity field enhances the energy transfer and simultaneously diminishes the scalar transfer. Adding a modulation to a random stirring protocol will thus negatively influence the mixing rate. We further derive the asymptotic behaviour of the response of the passive scalar quantities in the same flow for low and high forcing frequencies.
description: in Computers & Fluids, 2016
Cellulose: Characteristics and applications for rechargeable batteries
Creators: name: Muddasar, Muhammad.
name: Beaucamp McLoughlin, Anne
name: Culebras, Mario
name: COLLINS, MAURICE
Publisher: name: University of Limerick
Year: 2023
Subjects: Engineering

description: Cellulose, an abundant natural polymer, has promising potential to be used for energy storage systems because of its excellent mechanical, structural, and physical characteristics. This review discusses the structural features of cellulose and describes its potential application as an electrode, separator, and binder, in various types of high-performing batteries. Various surface and structural characteristics of cellulose (e.g., fiber size, surface functional groups, the hierarchy of pores, and porosity levels) that contribute to its electrochemical performance are discussed. Cellulose structure/property/processing/function relationships are further focused and elucidated in terms of the latest developments in the emerging field of sustainable materials in Li-Ion, Na-Ion, and Li–S batteries.
Nematic fluctuations balancing the zoo of phases in half-filled quantum Hall systems
Creators: name: Mesaros, Andrej
name: Lawler, Michael J.
name: Kim, Eun-Ah
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Half-filled Landau levels form a zoo of strongly correlated phases. These include non-Fermi liquids (NFL), fractional quantum Hall (FQH) states, nematic phases, and FQH nematic phases. This diversity poses the question: what keeps the balance between the seemingly unrelated phases? The answer is elusive because the Halperin-Lee-Read (HLR) description that offers a natural departure point is inherent strongly coupled. But the observed nematic phases suggest nematic fluctuations play an important role. To study this possibility, we apply a recently formulated controlled double expansion approach in large-$N$ composite fermion flavors and small $ε$ non-analytic bosonic action to the case with both gauge and nematic boson fluctuations. In the vicinity of a nematic quantum critical line (NQCL), we find that depending on the amount of screening of the gauge- and nematic-mediated interactions controlled by $ε$'s, the RG flow points to all four mentioned correlated phases. When pairing preempts the nematic phase, NFL behavior is possible at temperatures above the pairing transition. We conclude by discussing measurements at low tilt angles which could reveal the stabilization of the FQH phase by nematic fluctuations.
Localized operator partitioning method for electronic excitation energies in the time-dependent density functional formalism
Creators: name: Nagesh, Jayashree
name: Frisch, Michael J.
name: Brumer, Paul
name: Izmaylov, Artur F.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We extend the localized operator partitioning method (LOPM) [J. Nagesh, A.F. Izmaylov, and P. Brumer, J. Chem. Phys. 142, 084114 (2015)] to the time-dependent density functional theory (TD-DFT) framework to partition molecular electronic energies of excited states in a rigorous manner. A molecular fragment is defined as a collection of atoms using Stratman-Scuseria-Frisch atomic partitioning. A numerically efficient scheme for evaluating the fragment excitation energy is derived employing a resolution of the identity to preserve standard one- and two-electron integrals in the final expressions. The utility of this partitioning approach is demonstrated by examining several excited states of two bichromophoric compounds: 9-((1-naphthyl)-methyl)-anthracene and 4-((2-naphthyl)-methyl)-benzaldehyde. The LOPM is found to provide nontrivial insights into the nature of electronic energy localization that are not accessible using simple density difference analysis.
description: 2 figures
Material Science Data Sharing and Management workshop
Creators: name: Mendes, Pedro S. F.
Publisher: name: Zenodo
Year: 2022
Subjects: Open science
Open data
Data management
Data sharing

description: The document contains a presentation slidepack created for the Material Science Data Sharing and Management workshop on 10/02/2022, part of the Machine Learning in Material Science series organized by the Material Pioneers (https://materialpioneers.com/). It covers: (i) why open science is important, (ii) what is data management about, and (iii) how can data be shared in a FAIR manner.
description: Funded by Fundação para a Ciência e Tecnologia através do Centro de Química Estrutural (UIDB/00100/2020; UIDP/00100/2020)
Open Data Crash Course
Creators: name: Mendes, Pedro S. F.
Publisher: name: Zenodo
Year: 2022
Subjects: Open science
Open data
Data management
Data sharing

description: The document contains a presentation slidepack for the Open Data Crash Course, at Técnico, Universidade de Lisboa. This is partially based on the Material Science Data Sharing and Management workshop on 10/02/2022. It covers: (i) why open science is important, (ii) what is data management about, and (iii) how can data be shared in a FAIR manner.
description: Funded by Fundação para a Ciência e Tecnologia through Centro de Química Estrutural (UIDB/00100/2020; UIDP/00100/2020) and EOSC/ RDA (2022-EOSC-RDA-OC-02).
Performance Models for Split-execution Computing Systems
Creators: name: Humble, Travis S.
name: McCaskey, Alexander J.
name: Schrock, Jonathan
name: Seddiqi, Hadayat
name: Britt, Keith A.
name: Imam, Neena
Publisher: name: arXiv
Year: 2016
Subjects: subject: Emerging Technologies (cs.ET)
subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Quantum Physics (quant-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Split-execution computing leverages the capabilities of multiple computational models to solve problems, but splitting program execution across different computational models incurs costs associated with the translation between domains. We analyze the performance of a split-execution computing system developed from conventional and quantum processing units (QPUs) by using behavioral models that track resource usage. We focus on asymmetric processing models built using conventional CPUs and a family of special-purpose QPUs that employ quantum computing principles. Our performance models account for the translation of a classical optimization problem into the physical representation required by the quantum processor while also accounting for hardware limitations and conventional processor speed and memory. We conclude that the bottleneck in this split-execution computing system lies at the quantum-classical interface and that the primary time cost is independent of quantum processor behavior.
description: Presented at 18th Workshop on Advances in Parallel and Distributed Computational Models [APDCM2016] on 23 May 2016; 10 pages
Dark matter interpretations of ATLAS searches for the electroweak production of supersymmetric particles in $\sqrt{s} = 8$ TeV proton-proton collisions
Creators: name: ATLAS Collaboration
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: A selection of searches by the ATLAS experiment at the LHC for the electroweak production of SUSY particles are used to study their impact on the constraints on dark matter candidates. The searches use $20\,{\rm fb}^{-1}$ of proton-proton collision data at $\sqrt{s}=8$ TeV. A likelihood-driven scan of a five-dimensional effective model focusing on the gaugino--higgsino and Higgs sector of the phenomenological minimal supersymmetric Standard Model is performed. This scan uses data from direct dark matter detection experiments, the relic dark matter density and precision flavour physics results. Further constraints from the ATLAS Higgs mass measurement and SUSY searches at LEP are also applied. A subset of models selected from this scan are used to assess the impact of the selected ATLAS searches in this five-dimensional parameter space. These ATLAS searches substantially impact those models for which the mass $m(\tildeχ^0_1)$ of the lightest neutralino is less than 65 GeV, excluding 86% of such models. The searches have limited impact on models with larger $m(\tildeχ^0_1)$ due to either heavy electroweakinos or compressed mass spectra where the mass splittings between the produced particles and the lightest supersymmetric particle is small.
description: 25 pages plus author list + cover pages (43 pages total), 6 figures, 4 tables, submitted to JHEP, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2015-12/
Reaction Spreading in Systems With Anomalous Diffusion
Creators: name: Cecconi, Fabio
name: Vergni, Davide
name: Vulpiani, Angelo
Publisher: name: arXiv
Year: 2016
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We briefly review some aspects of the anomalous diffusion, and its relevance in reactive systems. In particular we consider {\it strong anomalous} diffusion characterized by the moment behaviour $\langle x(t)^q \rangle \sim t^{q ν(q)}$, where $ν(q)$ is a non constant function, and we discuss its consequences. Even in the apparently simple case $ν(2)=1/2$, strong anomalous diffusion may correspond to non trivial features, such as non Gaussian probability distribution and peculiar scaling of large order moments. When a reactive term is added to a normal diffusion process, one has a propagating front with a constant velocity. The presence of anomalous diffusion by itself does not guarantee a changing in the front propagation scenario; a key factor to select linear in time or faster front propagation has been identified in the shape of the probability distribution tail in absence of reaction. In addition, we discuss the reaction spreading on graphs, underlying the major role of the connectivity properties of these structures, characterized by the {\em connectivity dimension}
description: 33 pages, 10 figures
Motive studentischer Erwerbsarbeit
Creators: name: Bastin, Sonja
name: Dingeldey, Irene
name: Fuchs, Carolin
Publisher: name: Arbeitnehmerkammer Bremen
Year: 2017
Subjects: subject: Nebenjob
subject: berufliche Qualifikationen
subject: Zusatzqualifikationen
subject: finanzielle Absicherung
subject: Studium
subject: 370

description: Der überwiegende Teil der Studierenden in Deutschland ist nebenbei erwerbstätig. Außer der Einkommenssteigerung wird dabei häufig das Ziel verfolgt, sich mit dem Nebenjob zusätzlich für den späteren Beruf zu qualifizieren. Die vorliegende Studie untersucht die verschiedenen Motive der Studierenden. Dabei zeigt sich, dass Studierende von Fächern mit diffusem angestrebten Berufsfeld (bspw. aus den Geistes- und Sozialwissenschaften) häufiger berufsqualifizierende Motive äußern als Studierende bspw. technisch- / naturwissenschaftlicher Studiengänge. Mittels Interviews mit erwerbstätigen Studierenden verschiedener Fachrichtungen am Hochschulstandort Bremen wurde vertiefend untersucht, inwiefern die ökonomische Lage das jeweilige Erwerbsmotiv beeinflusst. Damit wird eine bislang unbeachtete Quelle sozialer Bildungsbenachteiligung betrachtet. Die Ergebnisse zeigen, dass eine finanzielle Absicherung berufsqualifizierende Erwerbsmotive unterstützt. Dagegen verschiebt die ökonomische Abhängigkeit vom Job die Priorität in Richtung einer längerfristigen Verlässlichkeit. Studierende aus einkommensschwächerem Elternhaus können infolgedessen geringere Zusatzqualifikationen auf dem Arbeitsmarkt erwerben, was zu einer doppelten Benachteiligung führt. Die Ergebnisse zeigen Handlungsbedarf hinsichtlich einer Ausweitung staatlicher und privater Ausbildungsförderung sowie einer Sensibilisierung für die Anerkennung von qualifizierenden Nebenjobs als Teil der regulären Ausbildung. Dies beinhaltet auch eine Überarbeitung der Struktur der Studiengänge und -ordnungen.
Tetraquark states in the bottom sector and the status of the $Y_b$(10890) state
Creators: name: Patel, Smruti
name: Vinodkumar, P C
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We have done the exploratory study of bottom tetraquarks ($[bq\bar b \bar q];{q\in u,d}$) in the diquark-antidiquark framework with the inclusion of spin hyperfine, spin-orbit and tensor components of the one gluon exchange interaction. Our focus here is on the $Y_b$(10890) and other exotic states in the bottom sector. We have predicted some of the bottom counterparts to the charm tetraquark candidates. Our present study shows that if $Z_b(10610)$ and $Z_b(10650)$ are diquark-diantiquark states then they have to be first radial excitations only and we have predicted $Z_b(10650)$ state as first radial excitation of tetraquark state $X_b$ (10.143-10.230). We have identified $X_b$ state with $J^{PC}= 1^{+-}/0^{++}$ as being the analogue of $Z_c(3900)$. An observation of the $X_b$ will provide a deeper insight into the exotic hadron spectroscopy and is helpful to unravel the nature of the states connected by the heavy quark symmetry. We particularly focus on the lowest P wave $[bq][\bar b\bar q]$ states with $J^{PC}=1^{--}$ by computing their leptonic, hadronic and radiative decay widths to predict the status of still controversial $Y_b$(10890) state. Apart from this, we have also shown here the possibility of mixing of P wave states. In the case of mixing of $1^{--}$ state with different spin multiplicities, we found that predicted masses of the mixed P states differ from $Y_b$(10890) state only by $\pm20$ MeV energy difference which can be helpful to resolve further the structure of $Y_b$(10890).
description: arXiv admin note: text overlap with arXiv:1306.0695 by other authors
title: The ‘Australia’s Future Energy Resources’ (AFER) project: assessing the energy commodity resources potential in underexplored regions of central Australia
Creators: name: T., Bernecker
name: T., Bernecker
name: K., Bradey
name: B., Bradshaw
name: J., Iwanec
name: D., Lund
name: M., Szczepaniak
name: R., Owens
Publisher: name: Commonwealth of Australia (Geoscience Australia)
Year: 2023
Subjects: subject: Basin Analysis
subject: Petroleum and Coal Geology
subject: EARTH SCIENCES
subject: Basins
subject: Energy
subject: EFTF - Exploring for the Future
subject: Australia's Future Energy Resources
subject: Published_External

description: The ‘Australia’s Future Energy Resources’ (AFER) project is a four-year multidisciplinary investigation of the potential energy commodity resources in selected onshore sedimentary basins. The resource assessment component of the project incorporates a series of stacked sedimentary basins in the greater Pedirka-western Eromanga region in eastern central Australia. Using newly reprocessed seismic data and applying spatially enabled, exploration play-based mapping tools, a suite of energy commodity resources have been assessed for their relative prospectivity. One important aspects of this study has been the expansion of the hydrocarbon resource assessment work flow to include the evaluation of geological storage of carbon dioxide (GSC) opportunities. This form of resource assessment is likely to be applied as a template for future exploration and resource development, since the storage of greenhouse gases has become paramount in achieving the net-zero emissions target. It is anticipated that the AFER project will be able to highlight future exploration opportunities that match the requirement to place the Australian economy firmly on the path of decarbonisation.
title: The Delamerian Orogen: exposing an undercover arc
Creators: name: P., Gilmore
name: P., Gilmore
name: I., Roach
name: M., Doublier
name: D., Mole
name: Y., Cheng
name: A., Clark
name: L., Pitt
Publisher: name: Commonwealth of Australia (Geoscience Australia)
Year: 2023
Subjects: subject: EARTH SCIENCES
subject: EFTF - Exploring for the Future
subject: Darling-Curnamona-Delamerian
subject: Published_External

description: Short abstract: The Delamerian Orogen is spatially and temporally extensive, covering five states in central and eastern Australia. The orogen records the transition from Proterozoic Australia to the Phanerozoic Tasmanides, starting with rifting of the Rodinian supercontinent and transition to a passive margin from ca. 830 to 530 Ma, then developing as a convergent eastern Gondwanan margin from ca. 530 Ma that was terminated by the mid-to-late Cambrian Delamerian Orogeny. The orogen was later impacted by younger geodynamic events, particularly in the Ordovician-Silurian-Devonian. Due to the paucity of exposure, in particular in its central segment, and the complex cover sequences, significant parts of the Delamerian Orogen remain poorly documented. The orogen is also underexplored for resources despite demonstrated potential for magmatic-hydrothermal and other mineral systems. As part of the Exploring for the Future program, the Darling-Curnamona-Delamerian project is working to improve geodynamic framework and mineral systems knowledge through a range of activities including; analysis of legacy drill core, new stratigraphic drilling and major geophysical data acquisition campaigns (airborne electromagnetic, deep crustal seismic reflection, magnetotelluric). Significant first results reveal the existence of a corridor of Siluro-Devonian igneous rocks flanked by Cambrian igneous rocks within the Loch Lilly-Kars Belt, possibly related to an episode of rifting or extension, with potential for rift-related and magmatic-hydrothermal mineral systems of that age. Citation: Gilmore P.J., Roach I.C., Doublier M.P., Mole D.R., Cheng Y., Clark A.D. & Pitt L., 2023. From The Delamerian Orogen: exposing an undercover arc. In: Czarnota, K. (ed.) Exploring for the Future: Extended Abstracts, Geoscience Australia, Canberra, https://dx.doi.org/10.26186/148679
title: National mineral potential assessment for sediment-hosted copper mineral systems in Australia Version 1.0
Creators: name: A., Ford
name: J., Cloutier
name: A., Ford
name: D., Huston
name: M., Doublier
name: A., Schofield
name: K., Waltenberg
name: P., de Caritat
name: G., Fraser
name: E., Beyer
name: E., Bastrakov
name: K., Czarnota
Publisher: name: Commonwealth of Australia (Geoscience Australia)
Year: 2023
Subjects: subject: EFTF – Exploring for the Future
subject: Australia’s Resources Framework
subject: Mineral potential
subject: sediment-hosted base metals
subject: mineral systems
subject: Earth Sciences
subject: Data mining and knowledge discovery
subject: Published_External

description: Sediment-hosted copper (Cu) mineral systems are important sources of base metals and critical minerals such as cobalt that are vital to delivering Australia’s low-carbon economy. In Australia, sediment-hosted Cu resources account for ~11% of the total Cu resources. Given their significance to the Australian economy, national-scale mineral potential models for sediment-hosted Cu have been developed. In addition to the potential for sediment-hosted Cu mineralisation, the uncertainty related to data availability has been examined. Three mineral potentialmodels derived from the combination of two mineral systems have been derived from a large volume of precompetitive geoscience data combined with mineral systems expertise, each using a different combination of input maps to assess the influence of incomplete data on the results. The mineral potential models successfully predict the location of major sediment-hosted stratiform Cu and Mount Isa-type Cu deposits while highlighting new areas of elevated prospectivity in under-explored regions of Australia, reducing the exploration search spaceby up to ~84%.