cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Structural and electronic properties of the active site of [ZnFe] SulE
Creators: name: Moubarak, Samah
name: Rippers, Yvonne
name: Elghobashi-Meinhardt, Nadia
name: Mroginski, Maria Andrea
Publisher: name: Technische Universität Berlin
Year: 2022
Subjects: subject: 540 Chemie und zugeordnete Wissenschaften
subject: density functional theory calculations
subject: structural biology
subject: computational modeling
subject: metalloenzyme active site
subject: electronic properties
subject: sulerythrin
subject: quantum mechanical computations
subject: molecular mechanical computations

description: The function of the recently isolated sulerythrin (SulE) has been investigated using a combination of structural and electronic analyses based on quantum mechanical calculations. In the SulE structure of Fushinobu et al. (2003), isolated from a strictly aerobic archaeon, Sulfolobus tokadaii, a dioxygen-containing species was tentatively included at the active site during crystallographic refinement although the substrate specificity of SulE remains unclear. Studies have suggested that a structurally related enzyme, rubrerythrin, functions as a hydrogen peroxide reductase. Since SulE is a truncated version of rubrerythrin, the enzymes are hypothesized to function similarly. Hence, using available X-ray crystallography data (1.7 Å), we constructed various models of SulE containing a ZnII–Fe active site, differing in the nature of the substrate specificity (O2, H2O2), the oxidation level and the spin state of the iron ion, and the protonation states of the coordinating glutamate residues. Also, the substrate H2O2 is modeled in two possible configurations, differing in the orientation of the hydrogen atoms. Overall, the optimized geometries with an O2 substrate do not show good agreement with the experimentally resolved geometry. In contrast, excellent agreement between crystal structure arrangement and optimized geometries is achieved considering a H2O2 substrate and FeII in both spin states, when Glu92 is protonated. These results suggest that the dioxo species detected at the [ZnFe] active site of sulerythrin is H2O2, rather than an O2 molecule in agreement with experimental data indicating that only the diferrous oxidation state of the dimetal site in rubrerythrin reacts rapidly with H2O2. Based on our computations, we proposed a possible reaction pathway for substrate binding at the ZnFeII site of SulE with a H2O2 substrate. In this reaction pathway, Fe or another electron donor, such as NAD(P)H, catalyzes the reduction of H2O2 to water at the zinc–iron site.
Variations in teachers' perceptions of childrens' ethnicity and educational characteristics : a pilot study
Creators: name: Gillet, Anthony Hewett.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Machine-learning model predicting postoperative delirium in older patients using intraoperative frontal electroencephalographic signatures
Creators: name: Röhr, Vera
name: Blankertz, Benjamin
name: Radtke, Finn M.
name: Spies, Claudia
name: Koch, Susanne
Publisher: name: Technische Universität Berlin
Year: 2022
Subjects: subject: 610 Medizin und Gesundheit
subject: electroencephalography
subject: artificial intelligence
subject: prediction model
subject: machine learning
subject: aging
subject: postoperative delirium
subject: surgery

description: Objective: In older patients receiving general anesthesia, postoperative delirium (POD) is the most frequent form of cerebral dysfunction. Early identification of patients at higher risk to develop POD could provide the opportunity to adapt intraoperative and postoperative therapy. We, therefore, propose a machine learning approach to predict the risk of POD in elderly patients, using routine intraoperative electroencephalography (EEG) and clinical data that are readily available in the operating room. Methods: We conducted a retrospective analysis of the data of a single-center study at the Charité-Universitätsmedizin Berlin, Department of Anesthesiology [ISRCTN 36437985], including 1,277 patients, older than 60 years with planned surgery and general anesthesia. To deal with the class imbalance, we used balanced ensemble methods, specifically Bagging and Random Forests and as a performance measure, the area under the ROC curve (AUC-ROC). We trained our models including basic clinical parameters and intraoperative EEG features in particular classical spectral and burst suppression signatures as well as multi-band covariance matrices, which were classified, taking advantage of the geometry of a Riemannian manifold. The models were validated with 10 repeats of a 10-fold cross-validation. Results: Including EEG data in the classification resulted in a robust and reliable risk evaluation for POD. The clinical parameters alone achieved an AUC-ROC score of 0.75. Including EEG signatures improved the classification when the patients were grouped by anesthetic agents and evaluated separately for each group. The spectral features alone showed an AUC-ROC score of 0.66; the covariance features showed an AUC-ROC score of 0.68. The AUC-ROC scores of EEG features relative to patient data differed by anesthetic group. The best performance was reached, combining both the EEG features and the clinical parameters. Overall, the AUC-ROC score was 0.77, for patients receiving Propofol it was 0.78, for those receiving Sevoflurane it was 0.8 and for those receiving Desflurane 0.73. Applying the trained prediction model to an independent data set of a different clinical study confirmed these results for the combined classification, while the classifier on clinical parameters alone did not generalize. Conclusion: A machine learning approach combining intraoperative frontal EEG signatures with clinical parameters could be an easily applicable tool to early identify patients at risk to develop POD.
Functional, rheological, and microstructural properties of hydrothermal puffed and raw amaranth flour suspensions
Creators: name: Lux (Neé Bantleon), Tanja
name: Kardell, Martha
name: Reimold, Frederike
name: Erdoes, Adam
name: Floeter, Eckhard
Publisher: name: Technische Universität Berlin
Year: 2022
Subjects: subject: 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
subject: color change
subject: pasting properties
subject: pseudocereal suspension
subject: puffed amaranth
subject: water absorption

description: The pseudocereal amaranth is commonly used in food as whole puffed grain. To improve the utilization of amaranth, hydrothermally treated suspensions of puffed and raw Amaranthus caudatus flour and their blends were investigated in this study. The suspensions were hydrothermally treated at 20, 50, and 80°C for 1, 5, and 24 h. The blends were treated at 80°C for 1 h. The effect of hydrothermal treatments of the suspensions on their morphological (color, SEM), water‐binding, and rheological‐functional properties was studied. The puffed amaranth suspensions exhibited cold swelling properties by rapid viscosity increase and significant water absorption properties. It was found that hydrothermal treatment at 80°C for 1 h significantly increased water absorption and viscosity in puffed and raw flour suspensions. However, the puffed suspensions showed significantly higher values in water binding and viscosity. Suspensions of raw amaranth flour showed increasing color differences with increasing temperature. Blends of raw and puffed amaranth flour resulted in a decreasing color change with increasing puffed flour content. Water absorption of the samples increased with an increasing puffed flour content. Raw amaranth flour and the 50/50 (puffed/raw) blend had the lowest, 10/90 and 20/80 (puffed/raw), and showed similar viscosity profiles to suspensions of pure puffed flour.
A framework for savagery?: a thematic network analysis of the management of savagery and examination of its relation ship to Islamic State strategy in the West
Creators: name: Dennis, Shane
Publisher: name: Macquarie University
Year: 2022
Subjects: Other education not elsewhere classified

description: Abu-Bakr-Naji's' The Management of Savagery' (MoS) is widely considered as a 'blueprint' for Islamic State' strategy. Indeed, both MoS themes and Islamic State' external operations incorporate principles of revolutionary warfare. However, despite correlations, Islamic State deviates from the strategic and systematic guidance articulated in MoS and appears to prioritise operational flexibility over doctrinal rigidity, often traversing through various phases of a politico-military strategy. This thesis finds Islamic State operations in the West are more opportunistic than strategic. What emerges from a comparative analysis of MoS themes and jihadist terrorist attacks between 2014 and 2018 is a strong correlation between themes of 'violence', 'vexation', 'small-scale operations', and the 'media battle' and broad operational trends. Yet these trends do not strictly follow MoS' structured approach. Rather, Islamic State strategy reflects the group's own adaptation of revolutionary warfare which has evolved over time and is relatively consistent with the group's ideological foundations
Relativistic Heat Equation via Lévy stable distributions: Exact Solutions
Creators: name: Penson, K. A.
name: Górska, K.
name: Horzela, A.
name: Dattoli, G.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We introduce and study an extension of the heat equation relevant to relativistic energy formula involving square root of differential operators. We furnish exact solutions of corresponding Cauchy (initial) problem using the operator formalism invoking one-sided Lévy stable distributions. We note a natural appearance of Bessel polynomials which allow one the obtention of closed form solutions for a number of initial conditions. The resulting relativistic diffusion is slower than the non-relativistic one, although it still can be termed a normal one. Its detailed statistical characterization is presented in terms of exact evaluation of arbitrary moments and is compared with the non-relativistic case.
Measurement of Renal Perfusion Using ASL-MRI and Renal Oxygenation Using BOLD-MRI in Dogs
Creators: name: Sanmiguel, Luis
name: Hillaert, Amber
name: Pullens, Pim
Publisher: name: Zenodo
Year: 2022

description: In mammals, kidney diseases are a prevalent condition. In dogs, the occurrence of chronic kidney disease is assessed to be between 0.5-7% (Lund EM. Et al). Renal fMRI is a non-invasive technique that can quantify renal function but is not routinely used in dogs. In this pilot study, we assess whether renal perfusion and oxygenation can be used in dogs. Three healthy Beagles were imaged on a Siemens PrismaFit 3T. For one Beagle the scan session was repeated one week later.
 For kidney perfusion, Renal blood flow (RBF) is measured, using Arterial Spin labeling (ASL) sequence (Siemens WIP ASP 1023H).
 For kidney oxygen consumption, a multi-echo GRE sequence with 12 equally spaced echo times, was used to generate Blood oxygen level-dependent (BOLD) contrast.
 RBF maps were computed on the scanner. R2* maps were estimated in MATLAB-R2021b. TLCO (Twelve-Layer Concentric Objects) method (Piskunowicz M. et al) was implemented to calculate mean R2* and RBF in outer and inner layers of each kidney.
 Measured RBF [ml/min/100g] in outer layers of right (R) and left (L) kidney was, R: 324.42 ± 63.83 and L: 341.02 ± 77.25 respectively. For inner layers, RBF was R: 139.76 ± 58.91 and L: 161.81 ± 59.58.
 Measured BOLD [s-1] in outer layers of the kidney was R: 30.70 ± 7.19 and L: 23.97 ± 3.02. For inner layers, BOLD was R: 18.69 ± 4.64 and L: 19.00 ± 5.01.
 These pilot scans confirm the viability of ASL-BOLD-MRI for canine renal assessment. The RBF values obtained in the cortex are similar to the ones obtained in previous ASL studies. The BOLD-MRI measurements in dogs tend to diverge and this sequence requires more refinement. This pilot study allows to compare RBF and BOLD among several subjects. These results are complementary upcoming study, with double sessions for 10 dogs.
SpEnD: Linked Data SPARQL Endpoints Discovery Using Search Engines
Creators: name: Yumusak, Semih
name: Dogdu, Erdogan
name: Kodaz, Halife
name: Kamilaris, Andreas
Publisher: name: arXiv
Year: 2016
Subjects: subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences

description: In this study, a novel metacrawling method is proposed for discovering and monitoring linked data sources on the Web. We implemented the method in a prototype system, named SPARQL Endpoints Discovery (SpEnD). SpEnD starts with a "search keyword" discovery process for finding relevant keywords for the linked data domain and specifically SPARQL endpoints. Then, these search keywords are utilized to find linked data sources via popular search engines (Google, Bing, Yahoo, Yandex). By using this method, most of the currently listed SPARQL endpoints in existing endpoint repositories, as well as a significant number of new SPARQL endpoints, have been discovered. Finally, we have developed a new SPARQL endpoint crawler (SpEC) for crawling and link analysis.
description: This paper has been withdrawn by the author due to a crucial illustration error in Figure 2, critical numerical errors in Table 5 and Table 8
Establishing the Martin Committee : a study of the setting-up of the Committee and its preliminary discussions
Creators: name: Davies, Susan L.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
De-noising the galaxies in the Hubble XDF with EMPCA
Creators: name: Maturi, Matteo
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present a method to model optical images of galaxies using Expectation Maximization Principal Components Analysis (EMPCA). The method relies on the data alone and does not assume any pre-established model or fitting formula. It preserves the statistical properties of the sample, minimizing possible biases. The precision of the reconstructions appears to be suited for photometric, morphological and weak lensing analysis, as well as the realization of mock astronomical images. Here, we put some emphasis on the latter because weak gravitational lensing is entering a new phase in which systematics are becoming the major source of uncertainty. Accurate simulations are necessary to perform a reliable calibration of the ellipticity measurements on which the final bias depends. As a test case, we process $7038$ galaxies observed with the ACS/WFC stacked images of the Hubble eXtreme Deep Field (XDF) and measure the accuracy of the reconstructions in terms of their moments of brightness, which turn out to be comparable to what can be achieved with well-established weak-lensing algorithms.
description: 9 pages, 11 figures, submitted to MNRAS
Basic information on Tuberculosis to be shared during communication activities
Creators: name: Gogichadze, Nino
name: Vilaplana, Cristina
name: Arnau Sagrera
name: Buhiichyk, Vira
name: Millet, Joan Pau
name: García, Raquel Prieto
name: Ospina, Jesús Edison
name: Ginès, Laura
name: Pepón Meneses
Publisher: name: Zenodo
Year: 2022
Subjects: tuberculosis
communication activities
public health
infectious diseases
general public

description: The SMA-TB Consortium has developed a leaflet with basic information on Tuberculosis to be distributed to general public during communication activities. This leaflet was created within the SMA-TB Project jointly by the IGTP team and the Public Health Agency of Barcelona (ASPB). The Fundació Lluita contra les Infeccions (Fight Infections Foundation) has also contributed to it, and Laura Ginès and Pepón Meneses illustrated it. The leaflet has been translated to several languages by members of the SMA-TB Consortium partners (all listed as contributors) in order others can reuse it: Catalan Spanish French Italian Portuguese Polish Deutsch Norwegian Ukrainian Georgian Afrikaans Per each language, two versions are provided: one to be printed in a home printer and another one to be printed in a print shop.
Sexual Quality of Life after Bariatric Surgery
Creators: name: Attersley-Smith, Stephanie
name: Hart, Kathryn
name: Whyte, Martin
name: Shawe, Jill
name: Stone, Sophia
name: Albon, Lorraine
name: Pring, Chris
Publisher: name: Zenodo
Year: 2020
Subjects: Sexual health
sexual function
Bariatric surgery

description: Female Sexual Quality of Life after Bariatric Surgery Background
 Approximately half of all bariatric procedures are performed on women of reproductive age. Studies have examined the impact of surgery on future pregnancies, but less attention has been paid to fertility and sexual function in women after bariatric surgery. Methods
 Participants were recruited preoperatively from Tier 4 (hospital) obesity services for a prospective cohort study of women of reproductive age (18-45 years) undergoing bariatric surgery. Participants completed a sexual quality of life-female (SQOL-f) questionnaire pre-operatively, then 3, 6 and 12 months post-operatively. SQOL-f can be completed regardless of sexual orientation or relationship status. Total scores are expressed as a percentage; the higher the percentage the better the SQOL. Questionnaire findings were analysed and interpreted in the wider context of health. Results
 To date, 22 women have baseline and 3 month data. Body mass index decreased from 46±7.9 kg/m2 before surgery to 37±6.8 kg/m2 3 months post. All women experienced weight loss by 3-months. The mean SQOL score at baseline was 43±29%, at 3 months post-operatively it had changed to 50±30%. Degree of weight loss did not correlate with changes in score. In two women (9%) SQOL-f decreased (suggesting adverse effect on SQOL); n=9 (41%) were unchanged and n=11 (50%) showed improvement in SQOL. Women were invited to add comments if they wished and based on these there appears to be a conflict between increased overall confidence and women adjusting to their new body image. Conclusion
 Data collection and analysis is ongoing but early data suggests improvement in sexual function in approximately half of women of reproductive age three-months post-surgery. Whether this benefit persists and translates into fertility outcomes requires further study. There appears to be a mismatch between overall confidence and body image; further analysis will investigate which of these constructs dominate as the interval from surgery increases.
An examination of goodwill impairment testing in Singapore
Creators: name: Khairi, Khairil Faizal
Publisher: name: Macquarie University
Year: 2022
Subjects: Other education not elsewhere classified

description: The aim of this thesis is to contemplate the degree to which Singaporean firms comply with the highly technical disclosure requirements under FRS 36 specific to goodwill impairment testing between the years 2005 to 2007. It is also aims to explain why some firms find the implementation of goodwill impairment testing difficult. Singapore is chosen because of its advanced and economically significant economy in the heart of Asia, with a highly skilled professional workforce and strong institutional and financial infrastructure to support quality financial reporting. This thesis examined 168 firms reporting goodwill in three consecutive years, to establish compliance and disclosure quality post-transition. Data from multiple years, rather than a single year, are used in this thesis to test the consistency of the results. The thesis found that there was a slight improvement in the rate of compliance with this requirement over the period of the study. A significant Friedman test implies that the change was significant and it implies that the development is statistically significant. Findings indicated that compliance level and disclosure quality, although better than prior studies would have suggested, is still sporadic and unpredictable. However, the overall results of the analysis in this thesis suggest that in the majority of cases the level of compliance and disclosure quality of compliance among the Singaporean listed firms is low. This is particularly so for the cash-generating unit (CGU) definition and goodwill allocation, and key input variables used in estimating CGU recoverable amounts (especially on discount rates selection). The thesis also found no significant difference in audit quality, regardless of whether the audit was undertaken by Big Four or non-Big Four auditors. The Chi-square test for independence indicated no significant association between the types of auditors and the compliance level and disclosure quality. Based on these results, the majority of Singaporean firms face a high degree of difficulty in the translation from idea to action in implementing the requirements of the standard. Further, questions are raised about the quality of accounting information among goodwill-intensive firms in Singapore and the robustness of regulatory oversight institutions operating within Singapore.
Local effects of the quantum vacuum in Lorentz-violating electrodynamics
Creators: name: Martín-Ruiz, A.
name: Escobar, C. A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The Casimir effect is one of the most remarkable consequences of the non-zero vacuum energy predicted by quantum field theory. In this paper we use a local approach to study the Lorentz violation effects of the minimal standard model extension on the Casimir force between two parallel conducting plates in the vacuum. Using a perturbative method similar to that used for obtaining the Born series for the scattering amplitudes in quantum mechanics, we compute, at leading order in the Lorentz-violating coefficients, the relevant Green's function which satisfies given boundary conditions. The standard point-splitting technique allow us to express the vacuum expectation value of the stress-energy tensor in terms of the Green's function. We discuss its structure in the region between the plates. We compute the renormalized vacuum stress, which is obtained as the difference between the vacuum stress in the presence of the plates and that of the vacuum. The Casimir force is evaluated in an analytical fashion by two methods: by differentiating the renormalized global energy density and by computing the normal-normal component of the renormalized vacuum stress. We compute the local Casimir energy, which is found to diverge as approaching the plates, and we demonstrate that it does not contribute to the observable force.
description: 15 pages, 1 figure
Experimental observation of coherent cavity soliton frequency combs in silica microspheres
Creators: name: Webb, Karen E.
name: Erkintalo, Miro
name: Coen, Stéphane
name: Murdoch, Stuart G.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We report on the experimental observation of coherent cavity soliton frequency combs in silica microspheres. Specifically, we demonstrate that careful alignment of the microsphere relative to the coupling fiber taper allows for the suppression of higher-order spatial modes, reducing mode interactions and enabling soliton formation. Our measurements show that the temporal cavity solitons have sub-100-fs durations, exhibit considerable Raman self-frequency shift, and generally come in groups of three or four, occasionally with equidistant spacing in the time domain. RF amplitude noise measurements and spectral interferometry confirm the high coherence of the observed soliton frequency combs, and numerical simulations show good agreement with experiments.
description: 5 pages, 4 figures; added 1 reference
Non-quasiparticle transport and resistivity saturation: A view from the large-N limit
Creators: name: Werman, Yochai
name: Kivelson, Steven A.
name: Berg, Erez
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The electron dynamics in metals are usually well described by the semiclassical approximation for long-lived quasiparticles. However, in some metals, the scattering rate of the electrons at elevated temperatures becomes comparable to the Fermi energy; then, this approximation breaks down, and the full quantum-mechanical nature of the electrons must be considered. In this work, we study a solvable, large-$N$ electron-phonon model, which at high temperatures enters the non-quasiparticle regime. In this regime, the model exhibits "resistivity saturation" to a temperature-independent value of the order of the quantum of resistivity - the first analytically tractable model to do so. The saturation is not due to a fundamental limit on the electron lifetime, but rather to the appearance of a second conductivity channel. This is suggestive of the phenomenological "parallel resistor formula", known to describe the resistivity of a variety of saturating metals.
description: 14 pages, 8 figures
Visual perceptual abilities of mildly mentally retarded adolescents
Creators: name: Duerdoth, Paul.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Giovani anni Settanta: attori, modelli, movimenti
Creators: name: Papa, Catia
Publisher: name: Zenodo
Year: 2019

description: Versione editoriale (Pdf): Catia Papa, "Giovani anni Settanta: attori, modelli, movimenti", in L'Italia degli anni Settanta. Narrazioni e interpretazioni a confronto, a cura di F. Balestracci e C. Papa, Soveria Mannelli, Rubbettino, 2019, pp. 125-144 ISBN: 978-88-498-5985-0
Electrical Resistance Tomography of Conductive Thin Films
Creators: name: Cultrera, Alessandro
name: Callegaro, Luca
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: The Electrical Resistance Tomography (ERT) technique is applied to the measurement of sheet conductance maps of both uniform and patterned conductive thin films. Images of the sheet conductance spatial distribution, and local conductivity values are obtained. Test samples are tin oxide films on glass substrates, with electrical contacts on the sample boundary, some samples are deliberately patterned in order to induce null conductivity zones of known geometry while others contain higher conductivity inclusions. Four-terminal resistance measurements among the contacts are performed with a scanning setup. The ERT reconstruction is performed by a numerical algorithm based on the total variation regularization and the L-curve method. ERT correctly images the sheet conductance spatial distribution of the samples. The reconstructed conductance values are in good quantitative agreement with independent measurements performed with the van der Pauw and the four-point probe methods.
description: IEEE Transactions on Instrumentation and Measurement
The Asymmetric CFT Landscape in D=4,6,8 with Extended Supersymmetry
Creators: name: Blumenhagen, Ralph
name: Fuchs, Michael
name: Plauschinn, Erik
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study asymmetric simple-current extensions of Gepner models in dimensions $D=4,6,8$ with at least eight supercharges in the right-moving sector. The models obtained in an extensive stochastic computer search belong to a small number of different classes. These classes can be categorized as dimensional reductions, asymmetric orbifolds with $(-1)^{F_L}$, extra gauge enhancement and as coming from the super Higgs-effect. Models in the latter class are particularly interesting, as they may correspond to non-geometric flux compactifications.
description: 37 pages
Lo sciopero delle ragazze: piccola storia degli anni Settanta
Creators: name: Papa, Catia
Publisher: name: Zenodo
Year: 2019

description: Versione finale editoriale (pdf): "Lo sciopero delle ragazze: piccola storia degli anni Settanta", in Sistemi educativi e politiche culturali dal mondo antico al contemporaneo, a cura di M. Vallozza e G.M. Di Nocera, Viterbo, Daidalos, 2019, pp. 213-217 ISBN: 978-88-7853-846-7
An Improved Distance and Mass Estimate for Sgr A* from a Multistar Orbit Analysis
Creators: name: Boehle, A.
name: Ghez, A. M.
name: Schödel, R.
name: Meyer, L.
name: Yelda, S.
name: Albers, S.
name: Martinez, G. D.
name: Becklin, E. E.
name: Do, T.
name: Lu, J. R.
name: Matthews, K.
name: Morris, M. R.
name: Sitarski, B.
name: Witzel, G.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present new, more precise measurements of the mass and distance of our Galaxy's central supermassive black hole, Sgr A*. These results stem from a new analysis that more than doubles the time baseline for astrometry of faint stars orbiting Sgr A*, combining two decades of speckle imaging and adaptive optics data. Specifically, we improve our analysis of the speckle images by using information about a star's orbit from the deep adaptive optics data (2005 - 2013) to inform the search for the star in the speckle years (1995 - 2005). When this new analysis technique is combined with the first complete re-reduction of Keck Galactic Center speckle images using speckle holography, we are able to track the short-period star S0-38 (K-band magnitude = 17, orbital period = 19 years) through the speckle years. We use the kinematic measurements from speckle holography and adaptive optics to estimate the orbits of S0-38 and S0-2 and thereby improve our constraints of the mass ($M_{bh}$) and distance ($R_o$) of Sgr A*: $M_{bh} = 4.02\pm0.16\pm0.04\times10^6~M_{\odot}$ and $7.86\pm0.14\pm0.04$ kpc. The uncertainties in $M_{bh}$ and $R_o$ as determined by the combined orbital fit of S0-2 and S0-38 are improved by a factor of 2 and 2.5, respectively, compared to an orbital fit of S0-2 alone and a factor of $\sim$2.5 compared to previous results from stellar orbits. This analysis also limits the extended dark mass within 0.01 pc to less than $0.13\times10^{6}~M_{\odot}$ at 99.7% confidence, a factor of 3 lower compared to prior work.
description: 56 pages, 14 figures, accepted to ApJ
Investigating Long-Lived Coherence in Biological Systems
Creators: name: Sapphire Lally
name: Rocco, Andrea
name: Al-Khalili, Jim
Publisher: name: Zenodo
Year: 2020
Subjects: subject: Quantum Biology
subject: Open Quantum Systems
subject: Theoretical Physics
subject: Quantum Physics
subject: FOS: Physical sciences
subject: Physics

description: Several biological systems undergo processes that cannot, as yet, be explained using classical physics. The hypothesis that quantum effects may be responsible for these processes is gaining credibility. In particular, the case of biological hydrogen bonds is particularly interesting. Hydrogen bonds are found in a variety of biological systems, including in the DNA scaffold, in enzymes, and in proteins. Transfer across hydrogen bonds can be modelled as a double-well proton tunnelling problem. However, there is significant concern that quantum coherence cannot survive for biologically relevant timescales in the high-temperature, strongly-interacting cellular environment. We investigate this issue in the framework of open quantum systems by adapting the so-called Caldeira-Leggett model. In open quantum systems, the spectral density describes the response between a system and its environment. By deriving a master equation that is valid for general spectral densities, it is possible to make predictions about the coherence dynamics of a biological hydrogen bond. This will generate insight into the credibility of the hypothesis that quantum mechanics is responsible for certain biological processes.
Aspects of non-verbal interaction between Down's syndrome children and their mothers : an observational study
Creators: name: Cumming, Anne
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Media literacy, coding e cittadinanza digitale. Apprendere e costruire con le tecnologie
Creators: name: Mario, Pireddu
Publisher: name: Zenodo
Year: 2019
Subjects: educazione
scuola
coding
media
tecnologia

description: This article is a chapter of the book "Educabilità. Scuola ed educazione della persona: introspezione e relazionalità" (a cura di Galanti M.A.), ETS, Pisa, 2019. ISBN 978-884675680-0
On a Microscopic Representation of Space-Time V
Creators: name: Dahm, Rolf
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: In order to extend our approach based on SU$*$(4), we were led to (real) projective and (line) Complex geometry. So here we start from quadratic Complexe which yield naturally the 'light cone' $x_{1}^{2}+x_{2}^{2}+x_{3}^{2}-x_{0}^{2}=0$ when being related to (homogeneous) point coordinates $x_α^{2}$ and infinitesimal dynamics by tetrahedral Complexe (or line elements). This introduces naturally projective transformations by preserving anharmonic ratios. Referring to old work of Pl{ü}cker relating quadratic Complexe to optics, we discuss (linear) symplectic symmetry and line coordinates, the main purpose and thread within this paper, however, is the identification and discussion of special relativity as direct invariance properties of line/Complex coordinates as well as their relation to 'quantum field theory' by complexification of point coordinates or Complexe. This can be established by the Lie mapping which relates lines/Complexe to sphere geometry so that SU(2), SU(2)$\times$U(1), SU(2)$\times$SU(2) and the Dirac spinor description emerge without additional assumptions. We give a short outlook in that quadratic Complexe are related to dynamics e.g.~power expressions in terms of six-vector products of Complexe, and action principles may be applied. (Quadratic) products like $F^{μν}F_{μν}$ or $F^{a\,μν}F^{a}_{μν}$, $1\leq a\leq 3$ are natural quadratic Complex expressions ('invariants') which may be extended by line constraints $λk\cdotε=0$ with respect to an 'action principle' so that we identify 'quantum field theory' with projective or line/Complex geometry having applied the Lie mapping.
description: 12 pages, proceedings of ISQS 2016, Prague, submitted to Journal of Physics : Conference Series (JPCS)
A novel information gain-based approach for classification and dimensionality reduction of hyperspectral images
Creators: name: Elmaizi, Asma
name: Nhaila, Hasna
name: Sarhrouni, Elkebir
name: Hammouch, Ahmed
name: Nacir, Chafik
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Recently, the hyperspectral sensors have improved our ability to monitor the earth surface with high spectral resolution. However, the high dimensionality of spectral data brings challenges for the image processing. Consequently, the dimensionality reduction is a necessary step in order to reduce the computational complexity and increase the classification accuracy. In this paper, we propose a new filter approach based on information gain for dimensionality reduction and classification of hyperspectral images. A special strategy based on hyperspectral bands selection is adopted to pick the most informative bands and discard the irrelevant and noisy ones. The algorithm evaluates the relevancy of the bands based on the information gain function with the support vector machine classifier. The proposed method is compared using two benchmark hyperspectral datasets (Indiana, Pavia) with three competing methods. The comparison results showed that the information gain filter approach outperforms the other methods on the tested datasets and could significantly reduce the computation cost while improving the classification accuracy. Keywords: Hyperspectral images; dimensionality reduction; information gain; classification accuracy. Keywords: Hyperspectral images; dimensionality reduction; information gain; classification accuracy.
The moduli spaces of $3d$ ${\cal N} \ge 2$ Chern-Simons gauge theories and their Hilbert series
Creators: name: Cremonesi, Stefano
name: Mekareeya, Noppadol
name: Zaffaroni, Alberto
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present a formula for the Hilbert series that counts gauge invariant chiral operators in a large class of 3d ${\cal N} \ge 2$ Yang-Mills-Chern-Simons theories. The formula counts 't Hooft monopole operators dressed by gauge invariants of a residual gauge theory of massless fields in the monopole background. We provide a general formula for the case of abelian theories, where nonperturbative corrections are absent, and consider a few examples of nonabelian theories where nonperturbative corrections are well understood. We also analyze in detail nonabelian ABJ(M) theories as well as worldvolume theories of M2-branes probing Calabi-Yau fourfold and hyperKähler twofold singularities with ${\cal N} = 2$ and ${\cal N} = 3$ supersymmetry.
description: 72 pages + appendices
Conformal QED in two-dimensional topological insulators
Creators: name: Menezes, N.
name: Palumbo, Giandomenico
name: Smith, C. Morais
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: It has been shown recently that local four-fermion interactions on the edges of two-dimensional time-reversal-invariant topological insulators give rise to a new non-Fermi-liquid phase, called helical Luttinger liquid (HLL). In this work, we provide a first-principle derivation of this non-Fermi-liquid phase based on the gauge-theory approach. Firstly, we derive a gauge theory for the edge states by simply assuming that the interactions between the Dirac fermions at the edge are mediated by a quantum dynamical electromagnetic field. Here, the massless Dirac fermions are confined to live on the one-dimensional boundary, while the (virtual) photons of the U(1) gauge field are free to propagate in all the three spatial dimensions that represent the physical space where the topological insulator is embedded. We then determine the effective 1+1-dimensional conformal field theory (CFT) given by the conformal quantum electrodynamics (CQED). By integrating out the gauge field in the corresponding partition function, we show that the CQED gives rise to a 1+1-dimensional Thirring model. The bosonized Thirring Hamiltonian describes exactly a HLL with a parameter K and a renormalized Fermi velocity that depend on the value of the fine-structure constant $α$.
description: (5+4) pages, 2 figures
New Aspects of Photon Propagation in Expanding Universes
Creators: name: Fahr, H. -J.
name: Heyl, M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: According to present cosmological views the energy density of CMB (Cosmic Microwave Background) photons, freely propagating through the expanding cosmos, varies proportional to 1/S^4 with S being the scale factor of the universe. This behavior is expected, because General Theory of Relativity, in application to FLRW- (Friedmann-Lemaitre-Robertson-Walker) cosmological universes, leads to the conclusion that the photon wavelengths increase during their free passage through the spacetime metrics of the universe by the same factor as does the scale factor S. This appears to be a reasonable explanation for the presently observed Planckian CMB spectrum with its actual temperature of about 2.7 K, while at the time of its origin after the last scattering during the recombination phase its temperature should have been about 3000 K, at an epoch of about 380 ky after the Big Bang, when the scale of the universe S_r was smaller by roughly a factor of S/S_r = 1+z_r = 1100 compared to the present scale S = S_0 of the universe. In this paper we start from putting the question whether the scale-behavior of the CMB energy density that enters the energy-momentum tensor of the field equations describing the expanding universe is really falling off like 1/S^4 and, if in fact a deviation from a behavior according to 1/S^4 would occur, why do we nevertheless presently observe a CMB energy density which appears to be in accordance with such a 1/S^4-scaling? This question arises from another basic and fundamental question, namely: Can we really assume that the wavelength of the freely propagating photon during its travel all the way along its light geodetic is permanently affected by the expansion of the universe, i.e continuously recognizes the expansion of the cosmic scale S? With other words: Do freely propagating photons ........
description: 6 pages
Chalcogenide glass planar MIR couplers for future chip based Bracewell interferometers
Creators: name: Goldsmith, Harry-Dean Kenchington
name: Cvetojevic, Nick
name: Ireland, Michael
name: Ma, Pan
name: Tuthill, Peter
name: Eggleton, Ben
name: Lawrence, John S.
name: Debbarma, Sukanta
name: Luther-Davies, Barry
name: Madden, Stephen J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Photonic integrated circuits are established as the technique of choice for a number of astronomical processing functions due to their compactness, high level of integration, low losses, and stability. Temperature control, mechanical vibration and acoustic noise become controllable for such a device enabling much more complex processing than can realistically be considered with bulk optics. To date the benefits have mainly been at wavelengths around 1550 nm but in the important Mid-Infrared region, standard photonic chips absorb light strongly. Chalcogenide glasses are well known for their transparency to beyond 10000 nm, and the first results from coupler devices intended for use in an interferometric nuller for exoplanetary observation in the Mid-Infrared L band (3800-4200 nm) are presented here showing that suitable performance can be obtained both theoretically and experimentally for the first fabricated devices operating at 4000 nm.
description: in Proc. SPIE 9907, Optical and Infrared Interferometry and Imaging V, 990730 (August 4, 2016)
Reading media: a phenomenology of reading in a multimodal context
Creators: name: Angel, Khyiah
Publisher: name: Macquarie University
Year: 2022
Subjects: Other education not elsewhere classified

description: This PhD project is an interdisciplinary Creative and Critical investigation into young adult reading behaviours. It is a dialogic artefact and exegesis. The creative component - the artefact is a new form of book-as-object - mBook, which forms 70% of the PhD. The critical component is an exegesis comprising 30% of the PhD. The artefact is a young adult multimodal novel, generically named a mBook, for the 14+ reading demographic. The mBook contributes to current challenges of traditional understandings and definitions of 'book-as-object' by incorporating multimodality into its paper format with the use of Augmented Reality. Multimodal engagement with the mBook involves the use of a readily available smartphone application to project content onto the printed page. The exegesis situates the mBook into the lived experience of young adults reading in a post-convergent multimodal context. Artefact title: I Know Why You Run I Know Why You Run is a young adult psychological thriller. Protagonist, Ben, is a troubled young man who is being terrorised with less than flattering video footage of his interactions with his social group by an unknown stalker via social media. In trying to identify his stalker, Ben is forced to confront issues with alcohol, and process grief of the loss of significant people in his life. Exegesis title: Phenomenology of Reading in a Multimodal Context Reading, writing and understandings of literacy have changed significantly in the past ten years due to constantly evolving technologies. Though young adults are reading more than they have, their textual preferences are increasingly multimodal. This project explores young adult engagement with multimodal text and the consequences of that engagement for authors of young adult fiction.
Clasificación de Eventos Astronómicos Transitorios con Redes Neuronales Recurrentes
Creators: name: Martin-Vega, Daniela
name: Molano, German Chaparro
name: Parra, Octavio José Salcedo
Publisher: name: Zenodo
Year: 2022

description: Presentation at the Colombian national congress of astronomy and astrophysics 2022
Media e trasformazioni socioculturali
Creators: name: Abruzzese Alberto
name: Mario, Pireddu
Publisher: name: Zenodo
Year: 2018
Subjects: media
cultura
conoscenza
tecnologia
società

description: This is a chapter (pp. 199-216) of the book "Dalla caduta del Muro ai nuovi muri. Trasformazioni globali e scenari internazionali 1989-2018" edited by UTET Grandi Opere, Torino. ISBN 9788802089140.
Setting firmer constraints on the evolution of the most massive, central galaxies from their local abundances and ages
Creators: name: Buchan, Stewart
name: Shankar, Francesco
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: There is still much debate surrounding how the most massive, central galaxies in the local universe have assembled their stellar mass, especially the relative roles of in-situ growth versus later accretion via mergers. In this paper, we set firmer constraints on the evolutionary pathways of the most massive central galaxies by making use of empirical estimates on their abundances and stellar ages. The most recent abundance matching and direct measurements strongly favour that a substantial fraction of massive galaxies with Mstar>3x10^11 Msun reside at the centre of clusters with mass Mhalo>3x10^13 Msun. Spectral analysis supports ages >10 Gyrs, corresponding to a formation redshift z_form >2. We combine these two pieces of observationally-based evidence with the mass accretion history of their host dark matter haloes. We find that in these massive haloes, the stellar mass locked up in the central galaxy is comparable to, if not greater than, the total baryonic mass at z_form. These findings indicate that either only a relatively minor fraction of their present-day stellar mass was formed in-situ at z_form, or that these massive, central galaxies form in the extreme scenario where almost all of the baryons in the progenitor halo are converted into stars. Interestingly, the latter scenario would not allow for any substantial size growth since the galaxy's formation epoch either via mergers or expansion. We show our results hold irrespective of systematic uncertainties in stellar mass, abundances, galaxy merger rates, stellar initial mass function, star formation rate and dark matter accretion histories.
description: 11 pages, 8 figures, MNRAS, accepted