cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
High dimensional thresholded regression and shrinkage effect
Creators: name: Zheng, Zemin
name: Fan, Yingying
name: Lv, Jinchi
Publisher: name: arXiv
Year: 2016
Subjects: subject: Methodology (stat.ME)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences
subject: 62J07(Primary) 62F07, 62P10(Secondary)

description: High-dimensional sparse modeling via regularization provides a powerful tool for analyzing large-scale data sets and obtaining meaningful, interpretable models. The use of nonconvex penalty functions shows advantage in selecting important features in high dimensions, but the global optimality of such methods still demands more understanding. In this paper, we consider sparse regression with hard-thresholding penalty, which we show to give rise to thresholded regression. This approach is motivated by its close connection with the $L_0$-regularization, which can be unrealistic to implement in practice but of appealing sampling properties, and its computational advantage. Under some mild regularity conditions allowing possibly exponentially growing dimensionality, we establish the oracle inequalities of the resulting regularized estimator, as the global minimizer, under various prediction and variable selection losses, as well as the oracle risk inequalities of the hard-thresholded estimator followed by a further $L_2$-regularization. The risk properties exhibit interesting shrinkage effects under both estimation and prediction losses. We identify the optimal choice of the ridge parameter, which is shown to have simultaneous advantages to both the $L_2$-loss and prediction loss. These new results and phenomena are evidenced by simulation and real data examples.
description: 23 pages, 3 figures, 5 tables
Joint Channel Training and Feedback for FDD Massive MIMO Systems
Creators: name: Shen, Wenqian
name: Dai, Linglong
name: Shi, Yi
name: Shim, Byonghyo
name: Wang, Zhaocheng
Publisher: name: arXiv
Year: 2015
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Massive multiple-input multiple-output (MIMO) is widely recognized as a promising technology for future 5G wireless communication systems. To achieve the theoretical performance gains in massive MIMO systems, accurate channel state information at the transmitter (CSIT) is crucial. Due to the overwhelming pilot signaling and channel feedback overhead, however, conventional downlink channel estimation and uplink channel feedback schemes might not be suitable for frequency-division duplexing (FDD) massive MIMO systems. In addition, these two topics are usually separately considered in the literature. In this paper, we propose a joint channel training and feedback scheme for FDD massive MIMO systems. Specifically, we firstly exploit the temporal correlation of time-varying channels to propose a differential channel training and feedback scheme, which simultaneously reduces the overhead for downlink training and uplink feedback. We next propose a structured compressive sampling matching pursuit (S-CoSaMP) algorithm to acquire a reliable CSIT by exploiting the structured sparsity of wireless MIMO channels. Simulation results demonstrate that the proposed scheme can achieve substantial reduction in the training and feedback overhead.
Hidden Gibbs random fields model selection using Block Likelihood Information Criterion
Creators: name: Stoehr, Julien
name: Marin, Jean-Michel
name: Pudlo, Pierre
Publisher: name: arXiv
Year: 2016
Subjects: subject: Computation (stat.CO)
subject: FOS: Computer and information sciences

description: Performing model selection between Gibbs random fields is a very challenging task. Indeed, due to the Markovian dependence structure, the normalizing constant of the fields cannot be computed using standard analytical or numerical methods. Furthermore, such unobserved fields cannot be integrated out and the likelihood evaluztion is a doubly intractable problem. This forms a central issue to pick the model that best fits an observed data. We introduce a new approximate version of the Bayesian Information Criterion. We partition the lattice into continuous rectangular blocks and we approximate the probability measure of the hidden Gibbs field by the product of some Gibbs distributions over the blocks. On that basis, we estimate the likelihood and derive the Block Likelihood Information Criterion (BLIC) that answers model choice questions such as the selection of the dependency structure or the number of latent states. We study the performances of BLIC for those questions. In addition, we present a comparison with ABC algorithms to point out that the novel criterion offers a better trade-off between time efficiency and reliable results.
Electromagnetic properties of a double layer graphene system with electron-hole pairing
Creators: name: Germash, K. V.
name: Fil, D. V.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study electromagnetic properties of a double layer graphene system in which electrons from one layer are coupled with holes from the other layer. The gauge invariant linear response functions are obtained. The frequency dependences of the transmission, reflection and absorption coefficients are computed. We predict a peak in the reflection and absorption at the frequency equals to the gap in the quasiparticle spectrum. It is shown that the electron-hole pairing results in an essential modification of the spectrum of surface TM plasmons. We find that the optical TM mode splits into a low frequency undamped branch and a high frequency damped branch. At zero temperature the lower branch disappears. It is established that the pairing does not influence the acoustic TM mode. It is also shown that the pairing opens the frequency window in the subgap range for the surface TE wave.
description: 18 pages
Spin frustration of a spin-1/2 Ising-Heisenberg three-leg tube as an indispensable ground for thermal entanglement
Creators: name: Strecka, Jozef
name: Alecio, Raphael Cavalcante
name: Lyra, Marcelo
name: Rojas, Onofre
Publisher: name: arXiv
Year: 2015
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The spin-1/2 Ising-Heisenberg three-leg tube composed of the Heisenberg spin triangles mutually coupled through the Ising inter-triangle interaction is exactly solved in a zero magnetic field. By making use of the local conservation for the total spin on each Heisenberg spin triangle the model can be rigorously mapped onto a classical composite spin-chain model, which is subsequently exactly treated through the transfer-matrix method. The ground-state phase diagram, correlation functions, concurrence, Bell function, entropy and specific heat are examined in detail. It is shown that the spin frustration represents an indispensable ground for a thermal entanglement, which is quantified with the help of concurrence. The specific heat displays diverse temperature dependences, which may include a sharp low-temperature peak mimicking a temperature-driven first-order phase transition. It is convincingly evidenced that this anomalous peak originates from massive thermal excitations from the doubly degenerate ground state towards an excited state with a high macroscopic degeneracy due to chiral degrees of freedom of the Heisenberg spin triangles.
description: 14 pages, 11 figures
Resolving the extended atmosphere and the inner wind of Mira ($o$ Ceti) with long ALMA baselines
Creators: name: Wong, K. T.
name: Kamiński, T.
name: Menten, K. M.
name: Wyrowski, F.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The prototypical Mira variable, $o$ Cet (Mira), has been observed as a Science Verification target in the 2014 ALMA Long Baseline Campaign with a longest baseline of 15 km. ALMA clearly resolves the images of the continuum and molecular line emission/absorption at an angular resolution of ~30 mas at 220 GHz. We image the data of the $^{28}$SiO v=0, 2 $J$=5-4 and H$_2$O $ν_2$=1 $J(K_a,K_c)$=5(5,0)-6(4,3) transitions and extract spectra from various lines-of-sight towards Mira's extended atmosphere. In the course of imaging, we encountered ambiguities in the resulting images and spectra that appear to be related to the performance of the CLEAN algorithm. We resolve Mira's millimetre continuum emission and our data are consistent with a radio photosphere with a brightness temperature of 2611$\pm$51 K, in agreement with recent results obtained with the VLA. We do not confirm the existence of a compact region (<5 mas) of enhanced brightness. We derive the gas density, kinetic temperature, molecular abundance and outflow/infall velocities in Mira's extended atmosphere by modelling the SiO and H$_2$O lines. We find that SiO-bearing gas starts to deplete beyond 4$R_\star$ and at a kinetic temperature of $\lesssim$600 K. The inner dust shells are probably composed of grain types other than pure silicates. During this observation, Mira's atmosphere generally exhibited infall motion, with a shock front of velocity $\lesssim$12 km/s outside the radio photosphere. The structures predicted by the hydrodynamical model CODEX can reproduce the observed spectra in astonishing detail; while some other models fail when confronted with the new data. Combined with radiative transfer modelling, ALMA successfully demonstrates the ability to reveal the physical conditions of the extended atmospheres and inner winds of AGB stars in unprecedented detail. (Abbreviated abstract)
description: 55 pages, 42 figures, accepted for publication in Astronomy and Astrophysics
Electrochemical supercapacitor performance of SnO2 quantum dots
Creators: name: Bonu, V.
name: Gupta, B.
name: Chandra, S.
name: Das, A
name: Dhara, S.
name: Tyagi, A. K.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Metal oxide nanostructures are widely used in energy applications like super capacitors and Li-on battery. Smaller size nanocrystals show better stability, low ion diffusion time, higher-ion flux and low pulverization than bigger size nanocrystals during electrochemical operation. Studying the distinct properties of smaller size nanocrystals such as quantum dots (QDs) can improve the understanding on reasons behind the better performance and it will also help in using QDs or smaller size nanoparticles (NPs) more efficiently in different applications. Aqua stable pure SnO2 QDs with compositional stability and high surface to volume ratio are studied as an electrochemical super capacitor material and compared with bigger size NPs of size 25 nm. Electron energy-loss spectroscopic study of the QDs revealed dominant role of surface over the bulk. Temperature dependent study of low frequency Raman mode and defect Raman mode of QDs indicated no apparent volume change in the SnO2 QDs within the temperature range of 80-300 K. The specific capacitance of these high surface area and stable SnO2 QDs has showed only 9% loss while increasing the scan rate from 20 mV/S to 500 mV/S. Capacitance loss for the QDs is less than 2% after 1000 cycles of charging discharging, whereas for the 25 nm SnO2 NPs, the capacitance loss is 8% after 1000 cycles. Availability of excess open volume in QDs leading to no change in volume during the electro-chemical operation and good aqua stability is attributed to the better performance of QDs over bigger sized NPs.
description: 31 pages, 9 figures, Journal
The HST view of the innermost narrow line region
Creators: name: Balmaverde, B.
name: Capetti, A.
name: Moisio, D.
name: Baldi, R. D.
name: Marconi, A.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We analyze the properties of the innermost narrow line region in a sample of low-luminosity AGN. We select 33 LINERs (bona fide AGN) and Seyfert galaxies from the optical spectroscopic Palomar survey observed by HST/STIS. We find that in LINERs the [NII] and [OI] lines are broader than the [SII] line and that the [NII]/[SII] flux ratio increases when moving from ground-based to HST spectra. This effect is more pronounced considering the wings of the lines. Our interpretation is that, as a result of superior HST spatial resolution, we isolate a compact region of dense ionized gas in LINERs, located at a typical distance of about 3 pc and with a gas density of about 10$^4$-10$^5$ cm$^{-3}$, which we identify with the outer portion of the intermediate line region (ILR). Instead, we do not observe these kinds of effects in Seyferts; this may be the result of a stronger dilution from the NLR emission, since the HST slit maps a larger region in these sources. Alternatively, we argue that the innermost, higher density component of the ILR is only present in Seyferts, while it is truncated at larger radii because of the presence of the circumnuclear torus. The ILR is only visible in its entirety in LINERs because the obscuring torus is not present in these sources.
description: 11 pages, 9 figures, A&A in press
Resonant Multilead Point-Contact Tunneling: Boundary State Formulation
Creators: name: Lee, Taejin
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study a model of resonant multilead point-contact tunneling by using the boundary state formulation. At a critical point the model is described by multi-flavor chiral fermions on an infinite line with a point contact interaction at the origin. By applying the folding procedure, previously developed for the model of resonant point-contact tunneling of a single lead, we map the model onto a non-chiral fermion model defined on the half line. The resonant point-contact tunneling interaction is transcribed into a non-local effective boundary interaction in the folded setup, where the boundary state formulation is applicable. We construct the boundary states for the models with two and three leads explicitly and evaluate the correlation functions of currents operators exactly. The electron transport between the leads is dominated by the resonant point-contact tunneling in the low frequency regime. We observe some $SU(2)$ and $SU(3)$ group theoretical structures, which may be useful to analyze more complex models.
description: 18 pages, 2 figures
Spectral calibration requirements of radio interferometers for Epoch of Reionisation science with the SKA
Creators: name: Trott, Cathryn M.
name: Wayth, Randall B.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Spectral features introduced by instrumental chromaticity of radio interferometers have the potential to negatively impact the ability to perform Epoch of Reionisation (EoR) and Cosmic Dawn (CD) science using the redshifted neutral hydrogen emission line from the early Universe. We describe instrument calibration choices that influence the spectral characteristics of the science data, and assess their impact on EoR statistical and tomographic experiments. Principally, we consider the intrinsic spectral response of the receiving antennas, embedded within a complete frequency-dependent primary beam response, and frequency-dependent instrument sampling. We assess different options for bandpass calibration. The analysis is applied to the proposed SKA1-Low EoR/CD experiments. We provide tolerances on the smoothness of the SKA station primary beam bandpass, to meet the scientific goals of statistical and tomographic (imaging) EoR programs. Two calibration strategies are tested: (1) fitting of each fine channel independently, and (2) fitting of an nth-order polynomial for each ~1~MHz coarse channel with (n+1)th-order residuals (n=2,3,4). Strategy (1) leads to uncorrelated power in the 2D power spectrum proportional to the thermal noise power, thereby reducing the overall array sensitivity. Strategy (2) leads to correlated residuals from the fitting, and residual signal power with (n+1)th-order curvature. For the residual power to be less than the thermal noise, the fractional amplitude of a fourth-order term in the bandpass across a single coarse channel must be <2.5% (50~MHz), <0.5% (150~MHz), <0.8% (200~MHz). The tomographic experiment places stringent constraints on phase residuals in the bandpass. We find that the root-mean-square variability over all stations of the change in phase across any fine channel (4.578~kHz) should not exceed 0.2 degrees.
description: 15 pages, accepted for publication in the Publications of the Astronomical Society of Australia
Asymptotic equivalence of regularization methods in thresholded parameter space
Creators: name: Fan, Yingying
name: Lv, Jinchi
Publisher: name: arXiv
Year: 2016
Subjects: subject: Methodology (stat.ME)
subject: Statistics Theory (math.ST)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: 62J07(Primary) 62F07(Secondary)

description: High-dimensional data analysis has motivated a spectrum of regularization methods for variable selection and sparse modeling, with two popular classes of convex ones and concave ones. A long debate has been on whether one class dominates the other, an important question both in theory and to practitioners. In this paper, we characterize the asymptotic equivalence of regularization methods, with general penalty functions, in a thresholded parameter space under the generalized linear model setting, where the dimensionality can grow up to exponentially with the sample size. To assess their performance, we establish the oracle inequalities, as in Bickel, Ritov and Tsybakov (2009), of the global minimizer for these methods under various prediction and variable selection losses. These results reveal an interesting phase transition phenomenon. For polynomially growing dimensionality, the $L_1$-regularization method of Lasso and concave methods are asymptotically equivalent, having the same convergence rates in the oracle inequalities. For exponentially growing dimensionality, concave methods are asymptotically equivalent but have faster convergence rates than the Lasso. We also establish a stronger property of the oracle risk inequalities of the regularization methods, as well as the sampling properties of computable solutions. Our new theoretical results are illustrated and justified by simulation and real data examples.
description: 39 pages, 3 figures
IGRINS Near-IR High-Resolution Spectroscopy of Multiple Jets around LkH$α$ 234
Creators: name: Oh, Heeyoung
name: Pyo, Tae-Soo
name: Yuk, In-Soo
name: Park, Byeong-Gon
name: Park, Chan
name: Chun, Moo-Young
name: Pak, Soojong
name: Kim, Kang-Min
name: Oh, Jae Sok
name: Jeong, Ueejeong
name: Yu, Young Sam
name: Lee, Jae-Joon
name: Kim, Hwihyun
name: Hwang, Narae
name: Kaplan, Kyle
name: Pavel, Michael
name: Mace, Gregory
name: Lee, Hye-In
name: Le, Huynh Anh Nguyen
name: Lee, Sungho
name: Jaffe, Daniel T.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present the results of high-resolution near-IR spectroscopy toward the multiple outflows around the Herbig Be star Lk{\Ha} 234 using the Immersion Grating Infrared Spectrograph (IGRINS). Previous studies indicate that the region around Lk{\Ha} 234 is complex, with several embedded YSOs and the outflows associated with them. In simultaneous H$-$ and K$-$band spectra from HH 167, we detected 5 {\FeII} and 14 H$_{2}$ emission lines. We revealed a new {\FeII} jet driven by radio continuum source VLA 3B. Position-velocity diagrams of H$_{2}$ 1$-$0 S(1) $λ$2.122 $\micron$ line show multiple velocity peaks. The kinematics may be explained by a geometrical bow shock model. We detected a component of H$_{2}$ emission at the systemic velocity (V$_{LSR}$ $=$ $-$10.2 {\kms}) along the whole slit in all slit positions, which may arise from the ambient photodissociation region. Low-velocity gas dominates the molecular hydrogen emission from knots A and B in HH 167, which is close to the systemic velocity, {\FeII} emission lines are detected at farther from the systemic velocity, at V$_{LSR}$ $=$ $-$100 $-$ $-$130 {\kms}. We infer that the H$_{2}$ emission arises from shocked gas entrained by a high-velocity outflow. Population diagrams of H$_{2}$ lines imply that the gas is thermalized at a temperature of 2,500 $-$ 3,000 K and the emission results from shock excitation.
description: Accepted for publication in ApJ
Antiferromagnetic Phases of the Kondo Lattice
Creators: name: Eder, R.
name: Grube, K.
name: Wrobel, P.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We discuss the paramagnetic and Neel-ordered phases of the Kondo lattice Hamiltonian on the 2D square lattice by means of bond Fermions. In the doped case we find two antiferromagnetic solutions, the first one with small ordered moment, heavy bands, and an antiferromagetically folded large Fermi surface - i.e. including the localized spins - the second one with large ordered moment, light bands and an antiferromagnetically folded conduction electron-only Fermi surface. The zero temperature phase diagram as a function of Kondo coupling and conduction electron density shows first and second order transition lines between the three different phases and agrees qualitatively with previous numerical studies. We compare to experiments on CeRh(1-x)Co(x)In(5) and find qualitative agreement.
description: 12 pages, 11 Postscript figures
Enhancing Energy Minimization Framework for Scene Text Recognition with Top-Down Cues
Creators: name: Mishra, Anand
name: Alahari, Karteek
name: Jawahar, C. V.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Recognizing scene text is a challenging problem, even more so than the recognition of scanned documents. This problem has gained significant attention from the computer vision community in recent years, and several methods based on energy minimization frameworks and deep learning approaches have been proposed. In this work, we focus on the energy minimization framework and propose a model that exploits both bottom-up and top-down cues for recognizing cropped words extracted from street images. The bottom-up cues are derived from individual character detections from an image. We build a conditional random field model on these detections to jointly model the strength of the detections and the interactions between them. These interactions are top-down cues obtained from a lexicon-based prior, i.e., language statistics. The optimal word represented by the text image is obtained by minimizing the energy function corresponding to the random field model. We evaluate our proposed algorithm extensively on a number of cropped scene text benchmark datasets, namely Street View Text, ICDAR 2003, 2011 and 2013 datasets, and IIIT 5K-word, and show better performance than comparable methods. We perform a rigorous analysis of all the steps in our approach and analyze the results. We also show that state-of-the-art convolutional neural network features can be integrated in our framework to further improve the recognition performance.
Gravitational collapse of Hagedorn fluids
Creators: name: Malafarina, Daniele
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We consider a toy model for relativistic collapse of an homogeneous perfect fluid that takes into account an equation of state for high density matter, in the form of an Hagedorn phase, and semiclassical corrections in the strong field. We show that collapse reaches a critical minimum size and then bounces. We discuss the conditions for collapse to halt and form a compact object. We argue that implications of models such as the one presented here are of great importance for astrophysics as they show that black holes may not be the only final outcome of collapse of very massive stars.
description: 7 pages, 5 figures
The Dynamics of the Schrodinger-Newton System with Self-Field Coupling
Creators: name: Franklin, J.
name: Guo, Y.
name: Newton, K. Cole
name: Schlosshauer, M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We probe the dynamics of a modified form of the Schrodinger-Newton system of gravity coupled to single particle quantum mechanics. At the masses of interest here, the ones associated with the onset of "collapse" (where the gravitational attraction is competitive with the quantum mechanical dissipation), we show that the Schrodinger ground state energies match the Dirac ones with an error of ~ 10%. At the Planck mass scale, we predict the critical mass at which a potential collapse could occur for the self-coupled gravitational case, m ~ 3.3 Planck mass, and show that gravitational attraction opposes Gaussian spreading at around this value, which is a factor of two higher than the one predicted (and verified) for the Schrodinger-Newton system. Unlike the Schrodinger-Newton dynamics, we do not find that the self-coupled case tends to decay towards its ground state; there is no collapse in this case.
description: Class. Quant. Grav. 33 (7), 2016
The impact of vocal load on the vocal function of professional music theatre singers
Creators: name: Phyland, Debra Jean
Publisher: name: Monash University
Year: 2017
Subjects: Uncategorized

description: Working singers rely on a vocal mechanism that can meet performance demands and be so-called ‘‘performance-fit.’’ Professional singers must be vocal athletes to meet the rigors of performance requirements. Typically, performances require extreme vocal loads in terms of measures of vocal function (intensity, frequency, and duration) and may be repeated four to eight times per week often under less than ideal conditions. Although the singer population has not been well studied, anecdotal reports suggest that it is a normal occurrence for performance-fit singers to experience positive and negative variabilities in vocal function across time and performances and significant fatigue effects after heavy vocal load. Whether these experiences are transient or whether, if sustained or cumulative, they can become symptomatic of vocal impairment and thereby threaten short- or long-term vocal health is not known. There is an obvious need to measure these vocal status shifts to determine vocal load thresholds and to establish normative data for working singers. Furthermore, prediction and management of vocal injury among singers is predicated on assumptions as to what constitutes normal. Vocal function among working professional singers had not hitherto been systematically measured using reliable and valid tools. This thesis (including three published papers) introduces EASE, a self-report tool designed to measure singers’ perceptions of the physical state of the singing voice. The psychometric properties of EASE are evaluated and differences in EASE performance according to demographic and voice-use characteristics among professional music theatre singers are explored. The format of the dissertation is ‘Thesis by Publication’ and comprises three published studies. (A fourth study not included in this dissertation will be prepared for publication and represents a continuation and extension of the research described herein).
Formation spectra of charmed meson--nucleus systems using an antiproton beam
Creators: name: Yamagata-Sekihara, J.
name: Garcia-Recio, C.
name: Nieves, J.
name: Salcedo, L. L.
name: Tolos, L.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate the structure and formation of charmed meson--nucleus systems, with the aim of understanding the charmed meson--nucleon interactions and the properties of the charmed mesons in the nuclear medium. The $\bar{D}$ mesic nuclei are of special interest, since they have tiny decay widths due to the absence of strong decays for the $\bar{D} N$ pair. Employing an effective model for the $\bar{D} N$ and $D N$ interactions and solving the Klein--Gordon equation for $\bar{D}$ and $D$ in finite nuclei, we find that the $D^{-}$-${}^{11}\rm{B}$ system has $1 s$ and $2p$ mesic nuclear states and that the $D^{0}$-${}^{11}\rm{B}$ system binds in a $1s$ state. In view of the forthcoming experiments by the PANDA and CBM Collaborations at the future FAIR facility and the J-PARC upgrade, we calculate the formation spectra of the $[D^{-}$-${}^{11}\rm{B}]$ and $[D^{0}$-${}^{11}\rm{B}]$ mesic nuclei for an antiproton beam on a ${}^{12} \rm{C}$ target. Our results suggest that it is possible to observe the $2 p$ $D^{-}$ mesic nuclear state with an appropriate experimental setup.
description: 8 pages, 5 figures
PV Array Behaviour in Tropical Environmental Conditions
Creators: name: Soler-Bientz, R.
name: Ricalde-Cab, L.
name: Diaz-Ocheita, M.
Publisher: name: WIP-Munich
Year: 2008
Subjects: PV Systems
Off-grid Applications

description: 23rd European Photovoltaic Solar Energy Conference and Exhibition, 1-5 September 2008, Valencia, Spain; 3625-3628
description: The PV modules temperature within a PV array and its performance as electrical generator are closely related with the environmental temperature at the installation site. Particularly in tropical locations, the solar radiation that arrives to the photovoltaic modules surface follows a pattern conditioned by the geographical position and the environmental conditions of the measurement site. Another important role is also played by the wind diurnal pattern that can modulate the effects of the solar radiation on the modules temperature. The presented research studied the performance of a PV modules array installed on the roof of the Energy Laboratory at the Autonomous University of Yucatan (Eastern of Mexico) considering the solar radiation patterns, the temperature of the PV modules and the wind speed and wind direction. The results of this research will contribute to optimize the sizing procedures for PV applications in tropical regions with similar climatic conditions.
GaSb Arrays for Solar Thermophotovoltaic System
Creators: name: Andreev, V.M.
name: Khvostikov, V.P.
name: Sorokina, S.
name: Potapovich, N.
name: Vlasov, A.S.
name: Shvarts, M.Z.
name: Timoshina, N.
Publisher: name: WIP-Munich
Year: 2008
Subjects: Advanced Photovoltaics
New Types of Cells and Modules

description: 23rd European Photovoltaic Solar Energy Conference and Exhibition, 1-5 September 2008, Valencia, Spain; 616-619
description: Comparison of GaSb TPV cells fabricated on the wafers obtained from different manufacturers is carried out. TPV arrays with three and four 1x1 cm2 cells connected in series and parallel were fabricated and investigated at both pulsed illumination and at radiation of emitter heated by gas. Arrays from four 8x9 mm2 GaSb cells connected in series-parallel using the shingled assembling process have been manufactured. TPV arrays from four GaSb cells 1x1 cm2 in size connected in both series and parallel have alike electrical power of 5 W at the
photocurrent density of 5 A/cm2.
Schiewer, Hans-Jochen: Schriften zur geistlichen Literatur und zur Frömmigkeitskultur des Mittelalters, hg. v. Regina D. Schiewer / Stefan Seeber
Creators: name: Klitzsch, Ingo
Publisher: name: Theologische Revue
Year: 2023

description: Theologische Revue, Vol. 119 (2023): September
Dancing with power: Aboriginal health, cultural safety and medical education
Creators: name: Phillips, Gregory Lloyd
Publisher: name: Monash University
Year: 2017
Subjects: Uncategorized

description: This thesis is a study of the relationships between Aboriginal and Torres Strait Islander health scholars and the medical schools within which they work. It is an empirical study, and a story, not only of the inclusion of Indigenous health into medical curricula in Australia, but an analysis of the relationships that underpin the way Aboriginal health in Australia is conceptualised, defined and translated into policy and practice. Theory, literature, field notes, case studies and Indigenous autoethnography are synthesised into a rich analysis of the pedagogy of place, power and power relations, structural violence and whiteness. The notion of ‘inclusion’ is revealed as problematic in Australian health, higher education, state and social institutions, in that these institutions tend to include Aboriginal peoples on terms which appear altruistic, but which actually reify white power and racism. In this way, medicine and medical education is practiced upon and for Aboriginal peoples, rather than with, using paradigms that render Aboriginal individuals as the problem. Medical schools and state institutions have difficulty in understanding Aboriginal paradigms of health care, and in particular, difficulty in implementing and applying these paradigms in action. Medical schools, while sustaining Indigenous health programs, can exhibit differing and covert values and motivations, a reticence to share economic control and governance, and poor adherence to, or understanding of, accountability and quality as it relates to Aboriginal health. The thesis proposes clearer definitions of what constitutes ‘Aboriginal health’ and ‘cultural safety’, a clearer model of applied cultural safety, and an implementation framework for making institutions culturally safe as a pretext for the practice of Aboriginal health using Aboriginal health paradigms.
Long Term Study of the Double Pulsar J0737-3039 with XMM-Newton: pulsar timing
Creators: name: Iacolina, M. N.
name: Pellizzoni, A.
name: Egron, E.
name: Possenti, A.
name: Breton, R.
name: Lyutikov, M.
name: Kramer, M.
name: Burgay, M.
name: Motta, S. E.
name: De Luca, A.
name: Tiengo, A.
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The relativistic double neutron star binary PSR J0737-3039 shows clear evidence of orbital phase-dependent wind-companion interaction, both in radio and X-rays. In this paper we present the results of timing analysis of PSR J0737-3039 performed during 2006 and 2011 XMM-Newton Large Programs that collected ~20,000 X-ray counts from the system. We detected pulsations from PSR J0737-3039A (PSR A) through the most accurate timing measurement obtained by XMM-Newton so far, the spin period error being of 2x10^-13 s. PSR A's pulse profile in X-rays is very stable despite significant relativistic spin precession that occurred within the time span of observations. This yields a constraint on the misalignment between the spin axis and the orbital momentum axis Delta_A ~6.6^{+1.3}_{-5.4} deg, consistent with estimates based on radio data. We confirmed pulsed emission from PSR J0737-3039B (PSR B) in X-rays even after its disappearance in radio. The unusual phenomenology of PSR B's X-ray emission includes orbital pulsed flux and profile variations as well as a loss of pulsar phase coherence on time scales of years. We hypothesize that this is due to the interaction of PSR A's wind with PSR B's magnetosphere and orbital-dependent penetration of the wind plasma onto PSR B closed field lines. Finally, the analysis of the full XMM-Newton dataset provided evidences of orbital flux variability (~7%) for the first time, involving a bow-shock scenario between PSR A's wind and PSR B's magnetosphere.
description: Comments: 16 Pages, 6 Figures. Accepted for publication in Astrophysical Journal (Draft Version)
Directed derivation and FACS-mediated purification of PAX3+/PAX7+ skeletal muscle precursors from human pluripotent stem cells
Creators: name: Borchin, Bianca
Publisher: name: Monash University
Year: 2017
Subjects: Uncategorized

description: Human pluripotent stem cells (hPSCs) constitute a promising resource for use in cell-based therapies and a valuable in vitro model for studying early human development and disease. Despite significant advancements in the derivation of specific fates from hPSCs, the generation of skeletal muscle remains challenging and is mostly dependent on transgene expression. Here, we describe a method based on the use of a small-molecule GSK3β inhibitor to derive skeletal muscle from several hPSC lines. We show that early GSK3β inhibition is sufficient to create the conditions necessary for highly effective derivation of muscle cells. Moreover, we developed a strategy for stringent fluorescence-activated cell sorting-based purification of emerging PAX3+/PAX7+ muscle precursors that are able to differentiate in postsort cultures into mature myocytes. This transgene-free, efficient protocol provides an essential tool for producing myogenic cells for in vivo preclinical studies, in vitro screenings, and disease modeling.
Two-dimensional RCFT's without Kac-Moody symmetry
Creators: name: Hampapura, Harsha R.
name: Mukhi, Sunil
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Using the method of modular-invariant differential equations, we classify a family of Rational Conformal Field Theories with two and three characters having no Kac-Moody algebra. In addition to unitary and non-unitary minimal models, we find "dual" theories whose characters obey bilinear relations with those of the minimal models to give the Moonshine Module. In some ways this relation is analogous to cosets of meromorphic CFT's. The theory dual in this sense to the Ising model has central charge 47/2 and is related to the Baby Monster Module.
description: 18 pages
A Micrometer-sized Heat Engine Operating Between Bacterial Reservoirs
Creators: name: Krishnamurthy, Sudeesh
name: Ghosh, Subho
name: Chatterji, Dipankar
name: Ganapathy, Rajesh
name: Sood, A. K.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Artificial micro heat engines are prototypical models to explore and elucidate the mechanisms of energy transduction in a regime that is dominated by fluctuations [1-2]. Micro heat engines realized hitherto mimicked their macroscopic counterparts and operated between reservoirs that were effectively thermal [3-7]. For such reservoirs, temperature is a well-defined state variable and stochastic thermodynamics provides a precise framework for quantifying engine performance [8-9]. It remains unclear whether these concepts readily carry over to situations where the reservoirs are out-of-equilibrium [10], a scenario of particular importance to the functioning of synthetic [11-12] and biological [13] micro engines and motors. Here we experimentally realized a micrometer-sized active Stirling engine by periodically cycling a colloidal particle in a time-varying harmonic optical potential across bacterial baths at different activities. Unlike in equilibrium thermal reservoirs, the displacement statistics of the trapped particle becomes increasingly non-Gaussian with activity. We show that as much as $\approx$ 85\% of the total power output and $\approx$ 50\% of the overall efficiency stems from large non-Gaussian particle displacements alone. Most remarkably, at the highest activities investigated, the efficiency of our quasi-static active heat engines surpasses the equilibrium saturation limit of Stirling efficiency - the maximum efficiency of a Stirling engine with the ratio of cold and hot reservoir temperatures ${T_C\over T_H} \to 0$. Crucially, the failure of effective temperature descriptions [14-16] for active reservoirs highlights the dire need for theories that can better capture the physics of micro motors and heat engines that operate in strongly non-thermal environments.
description: 14 Pages, 3 Figures
Spitzer IRAC Sparsely Sampled Phase Curve of the Exoplanet WASP-14b
Creators: name: Krick, J. E.
name: Ingalls, J.
name: Carey, S.
name: von Braun, K.
name: Kane, S. R.
name: Ciardi, D.
name: Plavchan, P.
name: Wong, I.
name: Lowrance, P.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Motivated by a high Spitzer IRAC oversubscription rate, we present a new technique of randomly and sparsely sampling phase curves of hot Jupiters. Snapshot phase curves are enabled by technical advances in precision pointing as well as careful characterization of a portion of the central pixel on the array. This method allows for observations which are a factor of roughly two more efficient than full phase curve observations, and are furthermore easier to insert into the Spitzer observing schedule. We present our pilot study from this program using the exoplanet WASP-14b. Data of this system were taken both as a sparsely sampled phase curve as well as a staring mode phase curve. Both datasets as well as snapshot style observations of a calibration star are used to validate this technique. By fitting our WASP-14b phase snapshot dataset, we successfully recover physical parameters for the transit and eclipse depths as well as amplitude and maximum and minimum of the phase curve shape of this slightly eccentric hot Jupiter. We place a limit on the potential phase to phase variation of these parameters since our data are taken over many phases over the course of a year. We see no evidence for eclipse depth variations compared to other published WASP-14b eclipse depths over a 3.5 year baseline.
description: 25 pages, 14 figures, ApJ accepted
Access to Sustainable Electricity for Rural Communities in the Island of Santo Antao (Cape Verde) Through PV Hybrid Micro-Grids
Creators: name: Graillot, A.
name: Vallvé, X.
name: Sneij, J.
name: Alves, L.
name: Pujol, D.
name: Cabral, J.
name: Lopes, C.
name: Monzonís, I.
name: Marcel, J.C.
Publisher: name: WIP-Munich
Year: 2008
Subjects: PV Systems
Off-grid Applications

description: 23rd European Photovoltaic Solar Energy Conference and Exhibition, 1-5 September 2008, Valencia, Spain; 3629-3630
description: This project is part of the ACP-EU Energy Facility programme. Cape Verde is an archipelago in the Atlantic Ocean. Because of the geographical location and the high rural population rate it is very difficult to provide universal energy access. The majority of the inhabitants of the island of Santo Antao are fishermen and the economical development of this island is strongly linked to fishing. Availability of permanent electricity is important for freezers, producing ice for the conservation of the catch and at same time for lighting and communication. The cost of imported fuel is very high and it is difficult to be shipped to the island.
The project, started on January 2008, will reduce the dependency on fuel in 2 communities of the island Santo Antao, Tarrafal (pop.: 1.000) and Monte Trigo (pop.: 600). The latter is without road connection to the rest of the villages on the island.
Review of Hamish Williams: Tolkien and the Classical World
Creators: name: Beck, Christian
Publisher: name: thersites. Journal for Transcultural Presences & Diachronic Identities from Antiquity to Date
Year: 2022

description: thersites. Journal for Transcultural Presences & Diachronic Identities from Antiquity to Date, Vol. 15 (2022): There and Back Again: Tolkien and the Greco-Roman World (eds. Alicia Matz and Maciej Paprocki)
Tumour suppressor p53 regulates aromatase and is inhibited by prostaglandin E₂ in adipose stromal cells in obesity and breast cancer
Creators: name: Wang, Xuyi
Publisher: name: Monash University
Year: 2017
Subjects: Uncategorized

description: Oestrogen-dependent postmenopausal breast cancer is associated with the increased expression of aromatase in breast adipose stromal cells (ASCs). Androgens are converted into oestrogens by aromatase and tumour-derived factors such as prostaglandin E2 (PGE2) stimulate aromatase expression via the activation of the proximal promoter PII. As a tumour suppressor, p53 is often mutated in breast cancer. However, mutations in p53 in ASCs are infrequent. This study aimed to determine the effect of PGE2 on p53 and to examine the role of p53 in regulating aromatase expression in human breast ASCs in the context of obesity related postmenopausal breast cancer. Primary human breast ASCs were isolated from breast tissue following breast reduction surgery. ASCs were treated with 1μM PGE₂ or the PGE₂ mimetic forskolin (FSK; 25μM)/phorbol ester (PMA; 4nM), and/or RITA (1μM; to stabilize p53). The effect of PGE₂ on p53 expression, subcellular localization and activity was examined by real-time PCR, Western blotting and immunofluorescence (IF). Results demonstrate that p53 transcript and nuclear protein expression are significantly decreased in ASCs in response to PGE₂. Moreover, PGE₂ also reduces p53 phosphorylation at serine 15 (Ser15) and inhibits its nuclear localisation in ASCs. The effect of p53 on aromatase transcript and activity was examined in RITA-treated ASCs by real-time PCR, and tritiated-water release assays. RITA significantly decreased the PGE2-mediated mRNA and protein expression and activity of aromatase. To examine whether p53 binds to PII directly, ChIP and reporter assays were also performed to examine p53 binding and regulation of aromatase PII. ChIP results demonstrate that p53 binds to a region on PII 438-418bp upstream of the transcription start site and that this interaction is significantly decreased in the presence of PGE2. QPCR and reporter assays demonstrate that RITA also significantly decreases the PGE2-stimulated activity of aromatase PII expression and activity. IF performed on clinical samples of breast tissue from cancer-freewomen and women with breast cancer demonstrates that nuclear p53 expression is significantly decreased in the latter group. We also found that the ratio of perinuclear to nuclear p53 is increased in tumour-associated ASCs and a positive correlation between perinuclear (inactive) p53 and aromatase was also observed. In conclusion, our findings demonstrate that p53 inhibits aromatase expression via directly binding to PII, and that this inhibition is alleviated in the presence of PGE₂. This study therefore reveals an unconventional role for p53 as a tumour suppressor in breast cancer.