cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Composition and thermal properties of Ganymede's surface from JWST/NIRSpec and MIRI observations
Creators: name: Bockelee-Morvan, D.
name: Lellouch, E.
name: Poch, O.
name: Quirico, E.
name: Cazaux, S.
name: de Pater, I.
name: Fouchet, T.
name: Fry, P. M.
name: Rodriguez-Ovalle, P.
name: Tosi, F.
name: Wong, M. H.
name: Boshuizen, I.
name: de Kleer, K.
name: Fletcher, L. N.
name: Meunier, L.
name: Mura, A.
name: Roth, L.
name: Saur, J.
name: Schmitt, B.
name: Trumbo, S. K.
name: Brown, M. E.
name: O'Donoghue, J.
name: Orton, G. S.
name: Showalter, M. R.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: JWST NIRSpec IFU (2.9-5.3 mu) and MIRI MRS (4.9-28.5 mu) observations were performed on both the leading and trailing hemispheres of Ganymede with a spectral resolution of ~2700. Reflectance spectra show signatures of water ice, CO2 and H2O2. An absorption feature at 5.9 mu is revealed and is tentatively assigned to sulfuric acid hydrates. The CO2 4.26-mu band shows latitudinal and longitudinal variations in depth, shape and position over the two hemispheres, unveiling different CO2 physical states. In the ice-rich polar regions, which are the most exposed to Jupiter's plasma irradiation, the CO2 band is redshifted with respect to other terrains. In the leading northern polar cap, the CO2 band is dominated by a high wavelength component at ~4.27 mu, consistent with CO2 trapped in amorphous water ice. At equatorial latitudes (and especially on dark terrains) the observed band is broader and shifted towards the blue, suggesting CO2 adsorbed on non-icy materials. Amorphous ice is detected in the ice-rich polar regions, and is especially abundant on the leading northern polar cap. In both hemispheres the north polar cap ice appears to be more processed than the south polar cap. A longitudinal modification of the H2O ice molecular structure and/or nano/micrometre-scale texture, of diurnal or geographic origin, is observed in both hemispheres. Ice frost is observed on the morning limb of the trailing hemisphere, possibly formed during the night from the recondensation of water subliming from the warmer subsurface. Reflectance spectra of the dark terrains are compatible with the presence of Na-/Mg-sulfate salts, sulfuric acid hydrates, and possibly phyllosilicates mixed with fine-grained opaque minerals, having an highly porous texture. Mid-IR brightness temperatures indicate a rough surface and a very low thermal inertia of 20-40 J m-2 s-0.5 K-1, consistent with a porous surface.
description: 35 pages, 34 figures
The growth of Islam in Papua New Guinea : implications for security and policy
Creators: name: Flower, Scott Jason
Publisher: name: Canberra, ACT : The Australian National University
Year: 2016
Subjects: subject: BP66.5.F556 2010
subject: Islam Papua New Guinea
subject: Islam and politics Papua New Guinea
subject: Muslim converts Papua New Guinea
subject: Muslims Political activity Papua New Guinea

description: Since 2001 the Muslim population of Papua New Guinea (PNG) has increased by over 500 percent as a result of religious conversions by indigenous Papua New Guineans. The spike in Islamic conversions in this largely Christian nation has coincided with a period of increased Islamic missionary activity, and a rise in media coverage on Muslims following the attacks by Islamic extremists on September 11, 2001. This thesis analyses the growth of Islam in PNG and seeks to determine whether the growing Muslim population is likely to have an impact on the security environment. This research also contributes to a very small body of literature which seeks to understand potential security risks posed by Muslim converts (as opposed to born Muslims). Since 1950 Islamic minorities have been engaged in more internal conflicts than any other type of religious or non-religious minority. The conversion of non-Muslims to Islam is a key strategy employed by Islamic extremists to recruit new members who can be engaged in radicalism across the globe. In the last decade the number of converts involved with radical and militant Islamic networks has noticeably increased. In addition, PNG borders Indonesia, a country that houses the world's largest population of Muslims and is home to a number of activist, radical and extremist Islamic groups. Based on five months of fieldwork during which I lived among Muslim communities in urban and rural regions of PNG, I examined the empirical foundations of Islam's growth to write what is the first comprehensive history of the establishment and institutionalisation of Islam in PNG. Taking an interdisciplinary approach and using interview data and fieldwork observations, I applied knowledge from the religious conversion and security studies literatures to analyse the causes and processes of Islamic conversion in PNG. This approach enabled new insights into which factors of conversion may subsequently influence the radicalisation of converts and affect security in PNG the Pacific region, and globally.
The myth-making power of government: British Columbia, constitutional renewal and the question of regional status, 1969-1982
Creators: name: Fletcher, Stephen James Joseph
Publisher: name: University of British Columbia
Year: 2009

description: This thesis examines British Columbia's proposals for constitutional reform i n the dramatic and tumultuous years leading up to the patriating of the Canadian Constitution in 1982. Of critical interest is the province's pursuit of regional status within the federation — a concept that evolved in scope and complexity under the auspices of successive Social Credit governments. Their goal was to restructure the Canadian state by enhancing Confederation's regional biases in BC's favour. The BC government, in an elaborate list of constitutional proposals released in 1978, called for the extensive reform of national political institutions — designed to improve, to a substantial degree, the status and influence of the province at the federal centre (through, among other things, a reformed Senate with provincially-controlled representation) . In the heated environment of federal-provincial relations that prevailed after the 1976 separatist victory in Quebec, the BC government argued that Canada consisted of five distinct regions, with BC being one of the five (the others were Ontario, Quebec, the Prairies , and the Atlantic). The province's quest for regionhood — and its concomitant demands for the devolution of federal powers — was partly a reaction to the centralist policies of the federal Liberal government under Pierre Trudeau. BC' s proposals signalled the end of constitutional conservatism in the province, but the proposals were marred by their architects' reliance on BC-style pragmatism (eg., provincebuilding). Another central focus is the role of myths and myth-making in Canadian constitutional politics. This thesis contends that BC's quest for regional status was flawed by its attempt to invoke myths about its distinctiveness from the top down. Its demand for regional status was seriously hurt by the lack of historic, grassroots support among the province's citizenry for such a concept. The importance of myths becomes evident when one looks at how myths have been nurtured by nationalists in Quebec. The gestation period for such myths is often generations-long; the fact BC's pursuit of regionhood ultimately failed during the constitutional negotiations of 1980-81 proves that myths — crucial to any society's understanding of itself and its history — cannot be invented out of thin air.
Systematic electrochemical etching of various metal tips for tunneling spectroscopy and scanning probe microscopy
Creators: name: Zhang, Jiawei
name: Wang, Pinyuan
name: Zhang, Xuao
name: Ji, Haoran
name: Luo, Jiawei
name: Wang, He
name: Wang, Jian
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Hard point-contact spectroscopy and scanning probe microscopy/spectroscopy are powerful techniques for investigating materials with strong expandability. To support these studies, tips with various physical and chemical properties are required. To ensure the reproducibility of experimental results, the fabrication of tips should be standardized, and a controllable and convenient system should be set up. Here a systematic methodology to fabricate various tips is proposed, involving electrochemical etching reactions. The reaction parameters fall into four categories: solution, power supply, immersion depth, and interruption. An etching system was designed and built so that these parameters could be accurately controlled. With this system, etching parameters for copper, silver, gold, platinum/iridium alloy, tungsten, lead, niobium, iron, nickel, cobalt, and permalloy were explored and standardized. Among these tips, silver and niobium's new recipes were explored and standardized. Optical and scanning electron microscopies were performed to characterize the sharp needles. Relevant point-contact experiments were carried out with an etched silver tip to confirm the suitability of the fabricated tips.
description: The article has been accepted by Review of Scientific Instruments. After it is published, it will be found at https://aip.scitation.org/journal/rsi
Neural Product Importance Sampling via Warp Composition
Creators: name: Litalien, Joey
name: Hašan, Miloš
name: Luan, Fujun
name: Mullia, Krishna
name: Georgiev, Iliyan
Publisher: name: arXiv
Year: 2024
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Graphics (cs.GR)
subject: FOS: Computer and information sciences

description: Achieving high efficiency in modern photorealistic rendering hinges on using Monte Carlo sampling distributions that closely approximate the illumination integral estimated for every pixel. Samples are typically generated from a set of simple distributions, each targeting a different factor in the integrand, which are combined via multiple importance sampling. The resulting mixture distribution can be far from the actual product of all factors, leading to sub-optimal variance even for direct-illumination estimation. We present a learning-based method that uses normalizing flows to efficiently importance sample illumination product integrals, e.g., the product of environment lighting and material terms. Our sampler composes a flow head warp with an emitter tail warp. The small conditional head warp is represented by a neural spline flow, while the large unconditional tail is discretized per environment map and its evaluation is instant. If the conditioning is low-dimensional, the head warp can be also discretized to achieve even better performance. We demonstrate variance reduction over prior methods on a range of applications comprising complex geometry, materials and illumination.
description: Published in ACM SIGGRAPH Asia 2024 Conference Papers. Project page: https://joeylitalien.github.io/publications/warp
Independent Co-Assurance using the Safety-Security Assurance Framework (SSAF): A Bayesian Belief Network Implementation for IEC 61508 and Common Criteria
Creators: name: Johnson, Nikita
name: Gheraibia, Youcef
name: Kelly, Tim
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cryptography and Security (cs.CR)
subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Safety Security Assurance Framework applied to two standards IEC 61508 and Common Criteria - ISO 15408
The Dynamics of Subhalos in Warm Dark Matter Models
Creators: name: Knebe, Alexander
name: Arnold, Bastian
name: Power, Chris
name: Gibson, Brad K.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a comparison of the properties of substructure halos (subhalos) orbiting within host halos that form in Cold Dark Matter (CDM) and Warm Dark Matter (WDM) cosmologies. Our study focuses on selected properties of these subhalos, namely their anisotropic spatial distribution within the hosts; the existence of a "backsplash'' population; the age-distance relation; the degree to which they suffer mass loss; and the distribution of relative (infall) velocities with respect to the hosts. We find that the number density of subhalos in our WDM model is suppressed relative to that in the CDM model, as we would expect. Interestingly, our analysis reveals that backsplash subhalos exist in both the WDM and CDM models. Indeed, there are no statistically significant differences between the spatial distributions of subhalos in the CDM and WDM models. There is evidence that subhalos in the WDM model suffer enhanced mass loss relative to their counterparts in the CDM model, reflecting their lower central densities. We note also a tendency for the (infall) velocities of subhalos in the WDM model to be higher than in the CDM model. Nevertheless, we conclude that observational tests based on either the spatial distribution or the kinematics of the subhalo population are unlikely to help us to differentiate between the CDM model and our adopted WDM model.
description: 10 pages, 11 figures, accepted for publication in MNRAS
Leopardi: Wiki Leopardi, Leopardi Ecdosys, Leopardi 3D
Creators: name: Priore, Roberta
name: Italia, Paola
Publisher: name: Griseldaonline
Year: 2021

description: I progetti digitali che vengono presentati nella relazione, relativi all’opera leopardiana, mostrano come il mezzo digitale fornisca paradigmi diversi a seconda dei casi filologici affrontati, e che – come nella filologia cartacea – non vi sia un’edizione ‘perfetta’. Il modello adottato per la rappresentazione della tradizione a stampa dei Canti – WIKI Leopardi – è stato sviluppato in ambito didattico, e costituisce la sperimentazione di una edizione collaborativa ad alto tasso di specializzazione dei partecipanti. L’edizione, che dall’apertura al pubblico, nell’aprile 2020, ha avuto più di 6000 contatti, ha una vocazione generalista e didattica e permette di coniugare l’evoluzione della struttura del libro, con quella delle singole varianti. Diversamente, il progetto Ecdosys Leopardi, adotta una rappresentazione stratigrafica secondo il metodo dei ‘grafi’, che si adatta molto bene al caso di studio utilizzato: il quaderno napoletano degli Idilli, in cui le ‘giornate’ di copia e le quattro campagne correttorie, possono essere rappresentate efficacemente nella molteplicità dei loro strati correttori. L’ultimo progetto presentato, Leopardi 3D, ancora in corso, applica al medesimo quaderno napoletano la tecnologia Rti (Reflectance Trasformation Imaging), che attraverso una serie di foto ad alta definizione, realizzate a luce radente e in riflessione su superficie convessa, permettono, dopo la ricomposizione post imaging, di rappresentare la tridimensionalità del manoscritto ed evidenziarne la stratigrafia compositiva, in un vero e proprio ‘viaggio immersivo’ nel manoscritto, considerato non più come un oggetto a due dimensioni, ma tridimensionale, dove la terza dimensione è quella del tempo.
description: Griseldaonline, V. 20 N. 2 (2021): Italianistica digitale
Geometric Invariant Theory and Einstein-Weyl Geometry
Creators: name: Kalafat, Mustafa
Publisher: name: arXiv
Year: 2006
Subjects: subject: Algebraic Geometry (math.AG)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 14M25, 14L24 (Primary) 53C28 (Secondary)

description: In this article, we give a survey of Geometric Invariant Theory for Toric Varieties, and present an application to the Einstein-Weyl Geometry. We compute the image of the Minitwistor space of the Honda metrics as a categorical quotient according to the most efficient linearization. The result is the complex weighted projective space CP_(1,1,2). We also find and classify all possible quotients.
description: A section on efficiency and classification is added
Letter from Harry Weekes to Jim [James Goldie], February 18, 1908
Creators: name: Weekes, Harry
Publisher: name: The University of British Columbia
Year: 2017

description: Letter from Harry Weekes to Jim (James Goldie), dated February 18, 1908; written on Lake of the Woods Milling Company letterhead. The letter concerns personal matters, such as the well being of himself as well as updates on the status and health of mutual friends.
Zeno and anti-Zeno effects for quantum Brownian motion
Creators: name: Maniscalco, Sabrina
name: Piilo, Jyrki
name: Suominen, Kalle-Antti
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this paper we investigate the occurrence of the Zeno and anti-Zeno effects for quantum Brownian motion. We single out the parameters of both the system and the reservoir governing the crossover between Zeno and anti-Zeno dynamics. We demonstrate that, for high reservoir temperatures, the short time behaviour of environment induced decoherence is the ultimate responsible for the occurrence of either the Zeno or the anti-Zeno effect. Finally we suggest a way to manipulate the decay rate of the system and to observe a controlled continuous passage from decay suppression to decay acceleration using engineered reservoirs in the trapped ion context .
description: 4 pages, 1 figure. v2: Replaced with the published version. Minor modifications in the text and title
Explicit n-descent on elliptic curves, I. Algebra
Creators: name: Cremona, John
name: Fisher, Tom
name: O'Neil, Cathy
name: Simon, Denis
name: Stoll, Michael
Publisher: name: arXiv
Year: 2006
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11G05, 14H52, 14H25

description: This is the first in a series of papers in which we study the n-Selmer group of an elliptic curve, with the aim of representing its elements as genus one normal curves of degree n. The methods we describe are practical in the case n=3 for elliptic curves over the rationals, and have been implemented in Magma.
description: 37 pages
Metal-Insulator Transition in 2D: Experimental Test of the Two-Parameter Scaling
Creators: name: Knyazev, D. A.
name: Omel'yanovskii, O. E.
name: Pudalov, V. M.
name: Burmistrov, I. S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We report a detailed scaling analysis of resistivity ρ(T,n) measured for several high-mobility 2D electron systems in the vicinity of the 2D metal-insulator transition. We analyzed the data using the two parameter scaling approach and general scaling ideas. This enables us to determine the critical electron density, two critical indices, and temperature dependence for the separatrix in the self-consistent manner. In addition, we reconstruct the empirical scaling function describing a two-parameter surface which fits well the ρ(T,n) data.
description: 4 pages, 4 figures, 1 table
Majorana braiding gates for topological superconductors in a one dimensional geometry
Creators: name: Narozniak, Marek
name: Dartiailh, Matthieu
name: Dowling, Jonathan P.
name: Shabani, Javad
name: Byrnes, Tim
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose and analyze a physical system capable of performing topological quantum computation with Majorana zero modes (MZM) in a one-dimensional topological superconductor (1DTS). One of the leading methods to realize quantum gates in 1DTS is to use T-junctions, which allows one to maneuver MZMs such as to achieve braiding. In this paper, we propose a scheme that is in a purely one-dimensional geometry and does not require T-junctions, instead replacing it with an auxiliary qubit. We show that this allows one to perform one and two logical qubit $ Z $ rotations. We first design a topologically protected logical $Z$-gate based entirely on local interactions within the 1DTS. Using an auxiliary qubit coupled to the topological superconductors, we extend the $Z$-gate to single and multiqubit arbitrary rotations with partial topological protection. Finally, to perform universal quantum computing, we introduce a scheme for performing arbitrary unitary rotations, albeit without topological protection. We develop a formalism based on unitary braids which creates transitions between different topological phases of the 1DTS system. The unitary formalism can be simply converted to an equivalent adiabatic scheme, which we numerically simulate and show that high fidelity operations should be possible with reasonable parameters.
A sparse coding approach to multiclass pixel labelling
Creators: name: Datta, Susmita
Publisher: name: The Australian National University
Year: 2015

description: In this thesis, we introduce a method for multiclass pixel labelling to facilitate scene understanding and semantic segmentation. Specifically, we focus on enforcing label consistency in local image regions through sparse modelling of image data. Individual pixels in an image may be assigned a label denoting a semantic category (such as sky, grass, human, car, etc.) based their observed features (such as colour, texture cues etc.). Such an independent classification scheme, without regards to the labels assigned to the neighbouring pixels, tend to be inconsistent or noisy -- pixels belonging to the same class often end up taking different labels. We employ a sparse denoising technique to approximate the noisy label configuration of a local image region with a more coherent one by combining a subset of semantically consistent example label configurations. We provide a diverse collection of label configurations as models (atoms) in the form of a dictionary and let a sparsity promoting technique come up with a configuration that can effectively correct for the sporadic and spurious label annotations of a local image region. We develop our pipeline in several stages. Initially, we take an l1-minimisation approach; we impose an l1-norm sparsity prior to obtain a weighted sparse linear combination of the dictionary atoms that depicts a consistent label configuration for a local image patch. Our initial formulation targets discrete, non-overlapping image patches individually. It falls short of assigning labels that manifest continuity between pixels within and between patches. We tackle this by introducing a shift-invariant model, which combines the outcomes of the same l1-minimisation formulation applied to overlapping image patches. This model is capable of removing spurious label annotations that do not comply with the labels of local image regions, and successful in tracing class-boundaries and fine-details of object structures. In another extension to our initial formulation, we target more extended image regions such that the label assignments of neighbouring pixels within and across patches comply with each other. We encourage the adjacent pixels with similar appearance to settle for the same label. This is achieved by adding a total variation penalty to our existing l1-minimisation formulation. This approach gives more accurate results. Our overall framework achieves a performance comparable to the state-of-the-art CRF-based pixel labelling methods that impose a smoothness prior in local image regions.
Integrating Data Mining and Predictive Modeling Techniques for Enhanced Retail Optimization
Creators: name: M, Sri Darshan
name: B, Jaisachin
name: N, NithinRaj
Publisher: name: arXiv
Year: 2024
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: FOS: Computer and information sciences

description: Predictive modeling and time-pattern analysis are increasingly critical in this swiftly shifting retail environment to improve operational efficiency and informed decision-making. This paper reports a comprehensive application of state-of-the-art machine learning to the retailing domain with a specific focus on association rule mining, sequential pattern mining, and time-series forecasting. Association rules: Relationship Mining This provides the key product relationships and customer buying patterns that form the basis of individually tailored marketing campaigns. Sequential pattern mining: Using the PrefixSpan algorithm, it identifies frequent sequences of purchasing products-extremely powerful insights into consumer behavior and also better management of the inventories. What is applied for sales trend forecasting models Prophet applies on historical transaction data over seasonality, holidays, and long-term growth. The forecast results allow predicting demand variations, thus helping in proper inventory alignment and avoiding overstocking or understocking of inventory. Our results are checked through the help of metrics like MAE (Mean Absolute Error) and RMSE (Root Mean Squared Error) to ensure our predictions are strong and accurate. We will combine the aspects of all of these techniques to prove how predictive modeling and temporal pattern analysis can help optimize control over inventory, enhance marketing effectiveness, and position retail businesses as they rise to ever greater heights. This entire methodology demonstrates the flexibility with which data-driven strategies can be leveraged to revitalize traditional retailing practices.
description: 5 pages, 8 fiqures, published in journal IJCSIS(International Journal of Computer Science and Information Security)
Bringing SOUL on sky
Creators: name: Pinna, Enrico
name: Rossi, Fabio
name: Puglisi, Alfio
name: Agapito, Guido
name: Bonaglia, Marco
name: Plantet, Cedric
name: Mazzoni, Tommaso
name: Briguglio, Runa
name: Carbonaro, Luca
name: Xompero, Marco
name: Grani, Paolo
name: Riccardi, Armando
name: Esposito, Simone
name: Hinz, Phil
name: Vaz, Amali
name: Ertel, Steve
name: Montoya, Oscar M.
name: Durney, Oliver
name: Christou, Julian
name: Miller, Doug L.
name: Taylor, Greg
name: Cavallaro, Alessandro
name: Lefebvre, Michael
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The SOUL project is upgrading the 4 SCAO systems of LBT, pushing the current guide star limits of about 2 magnitudes fainter thanks to Electron Multiplied CCD detector. This improvement will open the NGS SCAO correction to a wider number of scientific cases from high contrast imaging in the visible to extra-galactic source in the NIR. The SOUL systems are today the unique case where pyramid WFS, adaptive secondary and EMCCD are used together. This makes SOUL a pathfinder for most of the ELT SCAO systems like the one of GMT, MICADO and HARMONI of E-ELT, where the same key technologies will be employed. Today we have 3 SOUL systems installed on the telescope in commissioning phase. The 4th system will be installed in a few months. We will present here the results achieved during daytime testing and commissioning nights up to the present date.
description: 11 pages, 9 figures, 1 table. AO4ELT6 proceedings
Exciton Bimolecular Annihilation Dynamics in Push-Pull Semiconductor Polymers
Creators: name: Zheng, Yulong
name: Venkatesh, Rahul
name: Rojas-Gatjens, Esteban
name: Reichmanis, Elsa
name: Silva-Acuña, Carlos
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Exciton-exciton annihilation is a ubiquitous nonlinear dynamical phenomenon in materials hosting Frenkel excitons, that has been employed to probe exciton diffusion processes in conjugated polymeric materials. In this work, we investigate the nonlinear exciton dynamics of an electron push-pull conjugated polymer by fluence-dependent transient absorption and excitation-correlation photoluminescence spectroscopy, where we can quantitatively show the latter technique to be a more selective probe of the nonlinear dynamics. Simulations based on an exciton annihilation model that implements a simple (\textit{i.e.}\ time-independent) bimolecular rate constant decreasing trend for the extracted annihilation rates with excitation fluence. However, further investigation of the fluence-dependent transients suggests that the exciton-exciton annihilation bimolecular rate parameters are not constant in time, displaying a $t^{-1/2}$ time dependence, which we rationalize as reflective of anisotropic exciton diffusion. At ambient temperature, we estimate the exciton diffusion length to be $9 \pm 2$\,nm. In addition, exciton annihilation gives rise to a long-lived species that recombines on a nanosecond timescale. Our conclusions shed broad light onto nonlinear exciton dynamics in push-pull conjugated polymers.
description: Accepted for publication to J. Phys. Chem. Lett. on 28 December 2023
Semiclassical almost isometry
Creators: name: Paoletti, Roberto
Publisher: name: arXiv
Year: 2006
Subjects: subject: Symplectic Geometry (math.SG)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Let M be a complex projective manifold, and L an Hermitian ample line bundle on it. A fundamental theorem of Gang Tian, reproved and strengthened by Zelditch, implies that the Khaeler form of L can be recovered from the asymptotics of the projective embeddings associated to large tensor powers of L. More precisely, with the natural choice of metrics the projective embeddings associated to the full linear series |kL| are asymptotically symplectic, in the appropriate rescaled sense. In this article, we ask whether and how this result extends to the semiclassical setting. Specifically, we relate the Weinstein symplectic structure on a given isodrastic leaf of half-weighted Bohr-Sommerfeld Lagrangian submanifolds of M to the asymptotics of the the pull-back of the Fubini-Study form under the semiclassical projective maps constructed by Borthwick, Paul and Uribe.
description: exposition improved
Organic growth and form in abstract painting
Creators: name: Coats, Elizabeth
Publisher: name: The Australian National University
Year: 2018
Subjects: subject: ND196.A2 C63 2012
subject: Art, Abstract
subject: Painting, Modern 20th century
subject: Painting, Modern 21st century

description: This doctorate explores 'Organic Growth and Form in Abstract Painting', as the focus of my studio-based research, and which has resulted in two significant series of paintings, Organica and Streaming. The accompanying exegesis addresses experiences that are realized within the studio practice, and complements the two series of paintings. In the exegesis I describe the innovative and distinctive painting processes I have developed, and explain my motivation for working this way. I cite the writing of the philosopher of science, Henri Bortoft, in particular his description of 'active' seeing, which I suggest can be understood as a kind of modeling of my processes of making the Organica and Streaming paintings. Key to my research has been an investigation into the work of the early Russian avant-garde artist, musician, theorist and teacher, Mikhail Matyushin, who promoted an 'organic' vision of painting during the early years of modernist experimentation, insisting that perception cannot be separated from the body's inherent connection with nature. I discuss how the artists in the Organic studio, led by Matyushin, tested their sensitivity to perceptual and sensory experience with controlled experiments. Philosophically, they considered their findings to be congenial with the latest scientific discoveries of their time. Although my paintings are constructed very differently from those of Matyushin, my approach to perception and interpretation in painting is in sympathy with his thinking. The constructive and perceptual approach I have taken to both series of paintings has been directly influenced by immersion in natural environments. My exegesis provides a detailed account of this working process: how I work with geometric templates for the coordination of colours, and my systematic approach to their application, leading to uncontrived 'organic' extensions in the detail. I discuss my interest in the implicit knowledge garnered through perception of colours and the connective fabric underlying surface appearances in nature. I argue that these observations are generative resources for painting, and emphasise the fact that our sensory and thinking bodies are also part of nature. - provided by Candidate.
Construction and characterization of a chimerical cytokine which binds to cellulose: fusion of a bacterial cellulose-binding domain to steel factor
Creators: name: Doheny, James Gregory Brian
Publisher: name: University of British Columbia
Year: 2009

description: The carboxy-terminal cellulose-binding domain (CBD) from the bacterial cellulase Cex was fused to the amino-terminal extracellular domain from the murine growth factor steel factor (SLF) to create a chimeric growth factor (SLF-CBD) which binds specifically to cellulose. The biological activity of this fusion protein was tested using the murine bone marrow cell line B6SUtA. The biological activity of the fusion protein, when free in solution, was found to be similar to that of steel factor which lacked a cellulose-binding domain. Cellulose, being inert to mammalian cells, was then used as a matrix for the immobilization of the fusion protein in situ. The adsorption of the fusion protein to cellulose in situ was accompanied by an enhancement of its biological activity. The SLF-CBD fusion protein was developed as a prototype cellulose-binding growth factor. The reasons for developing a cellulose-binding-cytokine technology were threefold. Firstly, the availability of growth factors which bind to cellulose would greatly simplify the cultivation of bone marrow cells ex vivo. The adsorption of growth factors to cellulose in vitro would provide a concentrated source of these growth factors, and reduce the net amounts required for the efficient cultivation of these cells. Secondly, growth factors which can be immobilized on the outer surfaces of cellulose-coated microcarrier beads, or on the inner surfaces of cellulose-coated rollerbottles could be used for the large scale cultivation of transformed mammalian cell lines used to produce recombinant proteins. Thirdly, cellulose as an artificial extracellular matrix, could simplify the study of receptor-cytokine interactions and signal transduction pathways by eliminating the need for specially engineered stromal cells to present immobilized growth factors to target cells.
Impact of dopant compensation on the electrical properties of silicon for solar cells applications
Creators: name: Rougieux, Fiacre Emile
Publisher: name: The Australian National University
Year: 2012
Subjects: subject: TK2960.R68 2012
subject: Silicon solar cells
subject: Silicon crystals Electric properties
subject: Doped semiconductors

description: This thesis aims at understanding the mechanisms limiting the efficiency of compensated silicon solar cells (containing boron and phosphorus in the bulk). Such dopant compensation is common in solar grade materials, especially in silicon from the metallurgical route, and can potentially lead to a degradation of the materials electronic properties. We experimentally show that a thermal oxidation can create an n-type layer at the surface of compensated p-type silicon. This n-type layer is further shown to interfere with device performance and material characterization. We investigate the impact of compensation on the minority carrier lifetime, in particular for recombination through defects. Metastable defects such as chromium-boron pairs and the boron-oxygen defect are shown to degrade the lifetime of compensated n-type silicon. The boron-oxygen defect in compensated n-type silicon is then experimentally investigated. It is shown that if not mitigated, the boron-oxygen defect leads to a strong reduction in implied VOC. The defect is also shown to be fundamentally different in compensated n-type silicon compared to p-type silicon. Its concentration does not depend on the net doping and its recombination activity is dominated by a shallow defect rather than a deep defect. Through a theoretical investigation, we show that the carrier mobility is also affected by compensation. Both theory and experiments confirm that the mobility is reduced by the combined presence of acceptors and donors. Compensation not only increases the amount of ionized impurities and decreases the amount of free carriers, it also affects the scattering cross section of ionized impurities and free carriers. Theoretical calculations show a relatively weak influence of the compensating impurities on the mobility. However experimental results suggest a stronger influence of compensating impurities. This results in mobilities slightly lower than predicted by advanced model such as Klaassen's model. A new method to measure the sum of the majority and minority carrier mobility in silicon is introduced. Measurement of the influence of dopant density, injected carriers and temperature on the mobility sum are made and compared to data available in the literature.
A roadmap to strange star
Creators: name: Xu, Renxin
name: Lai, Xiaoyu
name: Xia, Chengjun
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: What if normal baryonic matter is compressed so tightly that atomic nuclei come into close contact? This question has been asked since 1930s. The fist answer was presented by Lev Landau whose speculation has been developed, and the concept of neutron star is then popularized. However, another answer is related to strange star, which becomes worthy of attention especially after the establishment of the standard model of particle physics in 1960s. The basic ideas of this study are introduced pedagogically. We must point out emphatically that flavour symmetry of and strong coupling between quarks would be essential in seeking true answer to the question. The final answer is expected to appear in the era of multimessenger astronomy. It is emphasized too that, besides the differences of global properties (e.g., mass-radius relation, maximum mass, tidal deformability), the strong-bound surface of strange star (rather than the gravity-bound one for conventional neutron star) could play an important role in identifying a strange star by astronomical observations.
description: to appear in Astronomische Nachrichten
A phonology of mbaham : reduction & contrast
Creators: name: Cottet, Fanny
Publisher: name: The Australian National University
Year: 2018

description: Mbaham is a non-Austronesian language spoken by approximately one thousand people, living in several villages in the Onin region of the Bomberai peninsula in West Papua, Indonesia. Mbaham and two related languages, Iha and Karas, are classified as West Bomberai languages of the Trans-New Guinea family (Ross 2005; Lewis, Simons & Fennig 2014). This thesis examines Mbaham phonology focusing on the language-internal conflict between effort reduction, on one hand, and distinctiveness on the other. These two forces have been shown to play a significant role in shaping phonological inventories and motivating phonological processes cross-linguistically (e.g. Lindblom 1983; 1990; Maddieson 2010; Kirchner 1998; 2001; Flemming 2004; Hayes, Kirchner & Steriade 2004). In the present dissertation, several topics are discussed in relation to this problematic, including vowel reduction, consonant lenition, assibilation, prenasalization and stop contrasts. The phonological analysis is supported by acoustic studies and articulatory observations. In Mbaham, some consonants and vowels are more reduced than others, depending on word position and stress placement. Immediately pretonic vowels are phonologically and phonetically reduced compared to stressed and post-tonic vowels. Non-initial consonants are lenited intervocalically and the inventory of word final obstruents is smaller than in the word initial position. Effort minimization in the production of consonants affects both oral and laryngeal gestures. Distinctiveness is enhanced for segments in strong positions, i.e. in stressed or word initial syllables; whereas gesture economy dominates in weaker positions. This study shows that there are language-specific rules that determine what phonetic principles are important for the phonology. It also finds that additional principles, such as feature economy, play a role in the language. By addressing several issues of Mbaham phonology, this analysis contributes to research on phonological typology that has often overlooked New Guinea languages and languages of the Pacific, representing almost 20% of the world's linguistic diversity (Foley 2000; Lewis et al. 2014). It is one of the few linguistic descriptions that propose a detailed phonological account of a non-Austronesian language of New Guinea, including the description of patterns typically found in other languages of the region, like prenasalization and dental discrepancy. It is also one of the few descriptions that present this level of phonetic details in support of the phonological analysis, for a language in this area. Finally, this study presents data collected with Mbaham informants during fieldwork in the Onin region. This new material will serve further descriptive and diachronic work on the under-studied West Bomberai language family.
L’edizione digitale dell’«Esordio» della «Storia d’Italia» di Francesco Guicciardini
Creators: name: Moreno, Paola
Publisher: name: Griseldaonline
Year: 2021

description: La Storia d’Italia di Francesco Guicciardini, sottoposta dall’autore a numerose revisioni e riscritture, costituisce per il filologo un campo di studio ancora ampiamente inesplorato. Molte sono infatti le domande ancora inevase sul metodo applicato dal Fiorentino nella stesura di quello che è comunemente giudicato un capolavoro della storiografia e un mirabile esempio di prosa italiana. Lo studio di un segmento topico dell’opera, quello dell’Esordio, giustamente celebrato da generazioni di lettori e studiosi, presenta numerose sfide che trovano nelle tecnologie digitali uno strumento d’indagine inedito fino a poco tempo fa. Il progetto portato avanti dall’Università di Liegi, accompagnato da altre istituzioni italiane e francesi (Université Grenoble-Alpes, ENS Lyon, Université Paris 8, Università degli Studi di Napoli Federico II) ha inteso sottoporre al vaglio della numerizzazione i problemi di rappresentazione e di resa editoriale di un testo stratificato e complesso. Questa proposta di studio non è tuttavia esclusiva. Altre forme di edizione, più tradizionali e su carta, sperimentate recentemente nel volume Come lavorava Guicciardini, possono completare la nostra lettura del celebre Esordio guicciardiniano.
description: Griseldaonline, V. 20 N. 2 (2021): Italianistica digitale
Kar'úk songs
Creators: name: Collins, Henry
name: Halpern, Abraham M.
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2023
Subjects: subject: yum

description: 2 WAV files. Date of November 16 begins midway through Side B. For associated notebooks, see Margaret Langdon Papers (Bancroft Library), carton 11, folders 6-7. Digitization by The Audio Archive (Burlingame, California).
Kar'úk songs
Creators: name: Collins, Henry
name: Halpern, Abraham M.
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2023
Subjects: subject: yum

description: 2 WAV files. Date of November 8 begins midway through Side B. For associated notebooks, see Margaret Langdon Papers (Bancroft Library), carton 11, folders 6-7. Digitization by The Audio Archive (Burlingame, California).
Search for gravitational wave signals from known pulsars in LIGO-Virgo O3 data using the 5n-vector ensemble method
Creators: name: D'Onofrio, Luca
name: De Rosa, Rosario
name: Palomba, Cristiano
name: Leaci, Paola
name: Piccinni, Ornella J.
name: Sequino, Valeria
name: Errico, Luciano
name: Trozzo, Lucia
name: Palfreyman, Jim
name: McKee, James W.
name: Meyers, Bradley W.
name: Stairs, Ingrid
name: Guillemot, Lucas
name: Cognard, Ismael
name: Theureau, Gilles
name: Keith, Michael J.
name: Lyne, Andrew
name: Flynn, Chris
name: Stappers, Ben
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: The 5n-vector ensemble method is a multiple test for the targeted search of continuous gravitational waves from an ensemble of known pulsars. This method can improve the detection probability combining the results from individually undetectable pulsars if few signals are near the detection threshold. In this paper, we apply the 5n-vector ensemble method to the O3 data set from the LIGO and Virgo detectors considering an ensemble of 201 known pulsars. We find no evidence for a signal from the ensemble and set a 95% credible upper limit on the mean ellipticity assuming a common exponential distribution for the pulsars' ellipticities. Using two independent hierarchical Bayesian procedures, we find upper limits of $1.2 \times 10^{-9}$ and $2.5 \times 10^{-9}$ on the mean ellipticity for the 201 analyzed pulsars.
Elastocapillarity-driven 2D nano-switches enable zeptoliter-scale liquid encapsulation
Creators: name: Ronceray, Nathan
name: Spina, Massimo
name: Chou, Vanessa Hui Yin
name: Lim, Chwee Teck
name: Geim, Andre K.
name: Garaj, Slaven
Publisher: name: arXiv
Year: 2023
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Biological nanostructures change their shape and function in response to external stimuli, and significant efforts have been made to design artificial biomimicking devices operating on similar principles. In this work we demonstrate a programmable nanofluidic switch, driven by elastocapillarity, and based on nanochannels built from layered two-dimensional nanomaterials possessing atomically smooth surfaces and exceptional mechanical properties. We explore operational modes of the nanoswitch and develop a theoretical framework to explain the phenomenon. By predicting the switching-reversibility phase diagram - based on material, interfacial and wetting properties, as well as the geometry of the nanofluidic circuit - we rationally design switchable nano-capsules capable of enclosing zeptoliter volumes of liquid, as small as the volumes enclosed in viruses. The nanoswitch will find useful application as an active element in integrated nanofluidic circuitry and could be used to explore nanoconfined chemistry and biochemistry, or be incorporated into shape-programmable materials.