cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Energy distribution and substructure formation in astrophysical MHD simulations
Creators: name: Kayanikhoo, Fatemeh
name: Cemeljic, Miljenko
name: Wielgus, Maciek
name: Kluzniak, Wlodek
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences
subject: J.2
subject: 85-08

description: During substructure formation in magnetized astrophysical plasma, dissipation of magnetic energy facilitated by magnetic reconnection affects the system dynamics by heating and accelerating the ejected plasmoids. Numerical simulations are a crucial tool for investigating such systems. In astrophysical simulations, the energy dissipation, reconnection rate and substructure formation critically depend on the onset of reconnection of numerical or physical origin. In this paper, we hope to assess the reliability of the state-of-the-art numerical codes, PLUTO and KORAL by quantifying and discussing the impact of dimensionality, resolution, and code accuracy on magnetic energy dissipation, reconnection rate, and substructure formation. We quantitatively compare results obtained with relativistic and non-relativistic, resistive and non-resistive, as well as two- and three-dimensional setups performing the Orszag-Tang test problem. We find the sufficient resolution in each model, for which numerical error is negligible and the resolution does not significantly affect the magnetic energy dissipation and reconnection rate. The non-relativistic simulations show that at sufficient resolution, magnetic and kinetic energies convert to internal energy and heat up the plasma. The results show that in the relativistic system, energy components undergo mutual conversion during the simulation time, which leads to a substantial increase in magnetic energy at 20\% and 90\% of the total simulation time of $10$ light-crossing times -- the magnetic field is amplified by a factor of five due to relativistic shocks. We also show that the reconnection rate in all our simulations is higher than $0.1$, indicating plasmoid-mediated regime. It is shown that in KORAL simulations magnetic energy is slightly larger and more substructures are captured than in PLUTO simulations.
description: 17 pages, 20 Figures,
Renormalization group study of intervalley scattering and valley splitting in a two-valley system
Creators: name: Punnoose, Alexander
Publisher: name: arXiv
Year: 2009
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: Renormalization group equations are derived for the case when both valley splitting and intervalley scattering are present in a two-valley system. A third scaling parameter is shown to be relevant when the two bands are split but otherwise distinct. The existence of this parameter changes the quantitative behavior at finite temperatures, but the qualitative conclusions of the two-parameter theory are shown to be unaffected for realistic choice of parameters.
Prospects for Large Relativity Violations in Matter-Gravity Couplings
Creators: name: Kostelecky, Alan
name: Tasson, Jay
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Deviations from relativity are tightly constrained by numerous experiments. A class of unmeasured and potentially large violations is presented that can be tested in the laboratory only via weak gravity couplings. Specialized highly sensitive experiments could achieve measurements of the corresponding effects. A single constraint of 1 x 10^{-11} GeV is extracted on one combination of the 12 possible effects in ordinary matter. Estimates are provided for attainable sensitivities in existing and future experiments.
description: 10 pages
Asymptotic Symmetries of String Theory on AdS3 X S3 with Ramond-Ramond Fluxes
Creators: name: Ashok, Sujay K.
name: Benichou, Raphael
name: Troost, Jan
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: String theory on AdS3 space-times with boundary conditions that allow for black hole states has global asymptotic symmetries which include an infinite dimensional conformal algebra. Using the conformal current algebra for sigma-models on PSU(1,1|2), we explicitly construct the R-symmetry and Virasoro charges in the worldsheet theory describing string theory on AdS3 X S3 with Ramond-Ramond fluxes. We also indicate how to construct the full boundary superconformal algebra. The boundary superconformal algebra plays an important role in classifying the full spectrum of string theory on AdS3 with Ramond-Ramond fluxes, and in the microscopic entropy counting in D1-D5 systems.
description: 30 pages
Anisotropic Reinforcement of Nanocomposites Tuned by Magnetic Orientation of the Filler Network
Creators: name: Jestin, Jacques
name: Cousin, Fabrice
name: Dubois, Isabelle
name: Ménager, Christine
name: Schweins, Ralph
name: Oberdisse, Julian
name: Boué, François
Publisher: name: arXiv
Year: 2009
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We present a new material which displays anisotropic and mechanical properties tuneable during synthesis under magnetic field. It is formulated by mixing aqueous suspensions of polymer nanolatex and magnetic nanoparticles, coated by a thin silica layer to improve their compatibility with the polymeric matrix, followed by casting. The magnetic properties of these nanoparticles enable their pre-orientation in the resulting nanocomposite when cast under magnetic field. Detailed insight on dispersion by Small Angle Neutron Scattering (SANS) shows chainlike nanoparticle aggregates aligned by the field on the nanometer scale. Applying strain to the nanocomposite parallel to the particle chains shows higher mechanical reinforcement, than when strain is transverse to field. . SANS from strained samples shows that strain parallel to the field induce an organization of the chains while strain perpendicular to the field destroys the chain field-induced ordering. Thus improved mechanical reinforcement is obtained from anisotropic interconnection of nanoparticle aggregates.
MOESM7 of Inter-site harmonization based on dual generative adversarial networks for diffusion tensor imaging: application to neonatal white matter development
Creators: name: Zhong, Jie
name: Wang, Ying
name: Li, Jie
name: Xue, Xuetong
name: Liu, Simin
name: Wang, Miaomiao
name: Gao, Xinbo
name: Wang, Quan
name: Yang, Jian
name: Li, Xianjun
Publisher: name: figshare
Year: 2020
Subjects: subject: Space Science
subject: Medicine
subject: Pharmacology
subject: Biological Sciences not elsewhere classified
subject: Developmental Biology
subject: Infectious Diseases
subject: FOS: Health sciences
subject: Computational Biology

description: Additional file 7: Figure S6. Changes of the reconstruction loss (left) and the negative adversarial loss (right) with epochs.
Above threshold s-wave resonances illustrated by the 1/2$^+$ states in $^9$Be and $^9$B
Creators: name: Garrido, E.
name: Fedorov, D. V.
name: Jensen, A. S.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We solve the persistent problem of the structure of the lowest $1/2^+$ resonance in $^9$Be which is important to bridge the A=8 gap in nucleosynthesis in stars. We show that the state is a genuine three-body resonance even though it decays entirely into neutron-$^8$Be relative s-waves. The necessary barrier is created by "dynamical" evolution of the wave function as the short-distance $α$-$^5$He structure is changed into the large-distance n-$^8$Be structure. This decay mechanism leads to a width about two times smaller than table values. The previous interpretations as a virtual state or a two-body resonance are incorrect. The isobaric analog 1/2$^+$ state in $^9$B is found to have energy and width in the vicinity of 2.0 MeV and 1.5 MeV, respectively. We also predict another 1/2$^+$ resonance in $^9$B with similar energy and width.
description: To be published in Physics Letters B
A Novel Holographic Framework Preserving Reflection Positivity in dS$_d$ Spacetime
Creators: name: Gazeau, Jean-Pierre
name: del Olmo, Mariano A.
name: Pejhan, Hamed
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: This manuscript introduces a novel holographic correspondence in $d$-dimensional de Sitter (dS$_d$) spacetime, connecting bulk dS$_d$ scalar unitary irreducible representations (UIRs) with their counterparts at the dS$_d$ boundary ${\cal{I}}^\pm$, all while preserving reflection positivity. The proposed approach, with potential applicability to diverse dS$_d$ UIRs, is rooted in the geometry of the complex dS$_d$ spacetime and leverages the inherent properties of the (global) dS$_d$ plane waves, as defined within their designated tube domains.
description: 6 pages, no figure, version accepted for publication in Physics Letters B
SI engine modeling using artificial neural networks as virtual sensors
Creators: name: Fu, Si Hua
Publisher: name: University Of Tasmania
Year: 2023

description: Spark ignition (SI) engines have been developed for more than one century. In today's modern vehicles, the SI engine has been demonstrated to be efficient and reliable. However, automotive engineers are still seeking to improve and optimize SI engine performance. The key to optimize the SI performance is the setup of the engine control unit (ECU). The setup includes various engine parameters, such as engine speed, brake torque, and air intake mass flow etc. Problems can arise in how to acquire the data of desired engine parameters for constructing the SI engine control system. Engine sensors and some special equipment are employed to acquire the desired data. The equipment includes the engine dynamometer and gas analyzer that are much more expensive than engine sensors. In addition, the setup process of the ECU is a time consuming procedure by testing the engine on the dynamometer. The engine system is highly non-linear, as simple mathematical equations have difficulty expressing the relationship between each engine parameter. Assumptions and simplifications must be made in conventional engine models. Artificial neural networks have the ability to model and optimize non-linear dynamic systems. Thus, the neural network may be an alternative approach for engine modeling if there is a lack of understanding of the engine system. This study aims to apply of artificial neural networks as virtual sensors in SI engine modeling. A Holden Vectra engine was employed for this study. The selected engine input parameters depend on the availability of the engine sensors. Power, fuel consumption and emissions are the output parameters which must be measured by the engine dynamometer and the gas analyzer. A total number of 8 inputs and 9 outputs were selected in the engine modelling. Two different artificial neural network structures namely: BackPropagation (BP) and Optimization Layer by Layer (OLL) neural networks were compared based on output parameters prediction. Two data sets were obtained for model training and prediction respectively. This work is a step towards establishing application of artificial neural networks as virtual sensors for IC engine modeling.
Random singlets and permutation symmetry in the disordered spin-2 Heisenberg chain: A tensor network renormalization group study
Creators: name: Lin, Yen-Tung
name: Liu, Shao-Fu
name: Chen, Pochung
name: Lin, Yu-Cheng
Publisher: name: arXiv
Year: 2023
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We use a tensor network renormalization group method to study random $S=2$ antiferromagnetic Heisenberg chains with alternating bond strength distributions. In the absence of randomness, bond alternation induces two quantum critical points between the $S=2$ Haldane phase, a partially dimerized phase and a fully dimerized phase, depending on the strength of dimerization. These three phases, called ($σ$,$4-σ$)=(2,2), (3,1) and (4,0) phases, are valence-bond solid (VBS) states characterized by $σ$ valence bonds forming across even links and $4-σ$ valence bonds on odd links. Here we study the effects of bond randomness on the ground states of the dimerized spin chain, calculating disorder-averaged twist order parameters and spin correlations. We classify the types of random VBS phases depending on the strength of bond randomness $R$ and dimerization $D$ using the twist order parameter, which has a negative/positive sign for a VBS phase with odd/even $σ$. Our results demonstrate the existence of a multicritical point in the intermediate disorder regime with finite dimerization, where (2,2), (3,1) and (4,0) phases meet. This multicritical point is at the junction of three phase boundaries in the $R$-$D$ plane: the (2,2)-(3,1) and (3,1)-(4,0) boundaries that extend to zero randomness, and the (2,2)-(4,0) phase boundary that connects another multicritical point in the undimerized limit. The undimerized multicritical point separates a gapless Haldane phase and an infinite-randomness critical line with the diverging dynamic critical exponent in the large $R$ limit at $D=0$. Furthermore, we identify the (3,1)-(4,0) phase boundary as an infinite-randomness critical line even at small $R$, and find the signature of infinite randomness at the (2,2)-(3,1) phase boundary only in the vicinity of the multicritical point.
description: 13 pages, 15 figures
Enhanced ribozyme-catalyzed recombination and oligonucleotide assembly in peptide-RNA condensates
Creators: name: Le Vay, Kristian
name: Song, Emilie Yeonwha
name: Ghosh, Basusree
name: Tang, T.-Y. Dora
name: Mutschler, Hannes
Publisher: name: TU Dortmund
Year: 2021
Subjects: subject: Catalysis
subject: Coacervates
subject: Ligases
subject: Peptides
subject: Ribozymes
subject: 570
subject: 540

description: The ability of RNA to catalyze RNA ligation is critical to its central role in many prebiotic model scenarios, in particular the copying of information during self-replication. Prebiotically plausible ribozymes formed from short oligonucleotides can catalyze reversible RNA cleavage and ligation reactions, but harsh conditions or unusual scenarios are often required to promote folding and drive the reaction equilibrium towards ligation. Here, we demonstrate that ribozyme activity is greatly enhanced by charge-mediated phase separation with poly-L-lysine, which shifts the reaction equilibrium from cleavage in solution to ligation in peptide-RNA coaggregates and coacervates. This compartmentalization enables robust isothermal RNA assembly over a broad range of conditions, which can be leveraged to assemble long and complex RNAs from short fragments under mild conditions in the absence of exogenous activation chemistry, bridging the gap between pools of short oligomers and functional RNAs.
description: Angew. Chem., Int. Ed. Engl.;60(50)
The biology of Tremella bambusina Sacc.
Creators: name: Brough, Sherman Gordon
Publisher: name: University of British Columbia
Year: 2011

description: This study was carried out on the Heterobasidiomycete Tremella bambusina Sacc . , a tuberculate jelly-fungus growing from perithecia of species of the pyrenomycete genera Valsa and Diaporthe. Single spore isolates of basidiocarps from a range of hosts were crossed and the compatibility system was found to be of a modified tetrapolar type. Two "A" alleles needed for initiation of conjugation tubes and 13 factors of the "B" locus determining dikaryotization, were identified from isolates of seven basidiocarps. Culture studies were carried out on the haploid yeastlike phase in liquid media and growth was measured by optical density. Rapid growth was obtained in chemically defined media when glucose, sucrose or maltose were used as carbon sources, where ammonium compounds were used as nitrogen sources, and where the vitamin thiamine was added to the synthetic medium. Good growth occurred at pH levels from 4.0 to 7.0 with optimum growth near pH 7.0. Most rapid growth took place at temperatures between 15° and 20° C. At higher temperatures (room temperature) rapid growth occurred when calcium compounds were added. Sodium acetate as a carbon source and the nitrate ion as a nitrogen source did not provide for good growth. Conjugation hormones were measured to be effective over a lateral range of 20 mm. in agar medium. These hormones behaved similarly to those of species of Tremella investigated by other workers, except that no tube initiation could be established after the hormone was autoclaved. In liquid media, relatively few conjugation tubes occurred and conjugation could not be obtained. Initiation and formation of conjugation tubes as well as growth of the dikaryotic phase was inhibited by diffusible substances produced by the haploid phase. Conjugation tubes, of compatible types, growing on agar medium, were tropic to each other within a 10µ. range. Observations on conjugation and subsequent dikaryotic growth were recorded. Clamps with haustoria as well as simple clamps were common at specific stages in development. Exposed mycelium on a variety of media, developed into basidiocarps within 10 days. No reaction with Valsa was observed in culture. Culture conditions affect the texture, structure and size of the basidiocarps, the hymenial surface, and basidial production. The life cycle was completed in culture, but basidiospore production was erratic. Conditions affecting basidiospore germination by budding, by repetition on the hymenial surfaces, and tube formation In the presence of conjugation hormones, were examined.
Dispersion Interactions between Optically Anisotropic Cylinders at all Separations: Retardation Effects for Insulating and Semiconducting Single Wall Carbon Nanotubes
Creators: name: Šiber, A.
name: Rajter, R. F.
name: French, R. H.
name: Ching, W. Y.
name: Parsegian, V. A.
name: Podgornik, R.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We derive the complete form of the van der Waals dispersion interaction between two infinitely long anisotropic semiconducting/insulating thin cylinders at all separations. The derivation is based on the general theory of dispersion interactions between anisotropic media as formulated in [J. N. Munday, D. Iannuzzi, Yu. S. Barash and F. Capasso, {\sl Phys. Rev. A} {\bf 71}, 042102 (2005)]. This formulation is then used to calculate the dispersion interactions between a pair of single walled carbon nanotubes at all separations and all angles. Non-retarded and retarded forms of the interactions are developed separately. The possibility of repulsive dispersion interactions and non-monotonic dispersion interactions is discussed within the framework of the new formulation.
Flooding prevention in distillation and extraction columns with aid of machine learning approaches
Creators: name: Oeing, Jonas
name: Neuendorf, Laura Maria
name: Bittorf, Lukas
name: Krieger, Waldemar
name: Kockmann, Norbert
Publisher: name: TU Dortmund
Year: 2021
Subjects: subject: Clustering
subject: Convolutional neural networks
subject: Flooding
subject: Process monitoring
subject: Time series forecasting
subject: 660

description: Flooding of separation columns is a severe limitation in the operation of distillation and liquid-liquid extraction columns. To observe operation conditions, machine learning algorithms are implemented to recognize the flooding behavior of separation columns on laboratory scale. Besides this, the investigated columns already provided the modular automation interface Module Type Package (MTP), which is used for data access of necessary sensor data. Hence, artificial intelligence (AI) tools with deep learning offer high potential for the process industry and allow to capture operating states that are otherwise difficult to detect or model. However, the advanced methods are only hesitantly applied in practice due to complex combination of operational sensing, data analysis, and active control of the equipment. This article provides an overview on how AI-based algorithms can be implemented in existing laboratory plants. Process sensor data as well as image data are used to model the flooding behavior of distillation and extraction columns for stable and robust operational conditions.
description: Chemie - Ingenieur - Technik;93(12)
Przemysław Nowak, Friede mit der Kirche. Bernhard Poschmann (1878–1955) und seine dogmengeschichtlichen Forschungen zum Bußsakrament, Köln–Weimar– Wien 2013
Creators: name: Wołyniec, Włodzimierz
Publisher: name: Wrocławski Przegląd Teologiczny
Year: 2020

description: Wrocławski Przegląd Teologiczny, Vol 21 No 2 (2013)
Inverse probability of treatment weighting with generalized linear outcome models for doubly robust estimation
Creators: name: Gabriel, Erin E
name: Sachs, Michael C
name: Martinussen, Torben
name: Waernbaum, Ingeborg
name: Goetghebeur, Els
name: Vansteelandt, Stijn
name: Sjölander, Arvid
Publisher: name: arXiv
Year: 2023
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: There are now many options for doubly robust estimation; however, there is a concerning trend in the applied literature to believe that the combination of a propensity score and an adjusted outcome model automatically results in a doubly robust estimator and/or to misuse more complex established doubly robust estimators. A simple alternative, canonical link generalized linear models (GLM) fit via inverse probability of treatment (propensity score) weighted maximum likelihood estimation followed by standardization (the g-formula) for the average causal effect, is a doubly robust estimation method. Our aim is for the reader not just to be able to use this method, which we refer to as IPTW GLM, for doubly robust estimation, but to fully understand why it has the doubly robust property. For this reason, we define clearly, and in multiple ways, all concepts needed to understand the method and why it is doubly robust. In addition, we want to make very clear that the mere combination of propensity score weighting and an adjusted outcome model does not generally result in a doubly robust estimator. Finally, we hope to dispel the misconception that one can adjust for residual confounding remaining after propensity score weighting by adjusting in the outcome model for what remains `unbalanced' even when using doubly robust estimators. We provide R code for our simulations and real open-source data examples that can be followed step-by-step to use and hopefully understand the IPTW GLM method. We also compare to a much better-known but still simple doubly robust estimator.
Switching circuits as information networks
Creators: name: Matheson, William Stephen
Publisher: name: University of British Columbia
Year: 2011

description: A single-output combinational switching network has a number of input terminals, each carrying a signal variable which may take one of two values, and an output terminal, the signal variable of which has a value determined ideally by the input signals only. In this thesis, we make an arbitrary assignment of probabilities to each of the possible configurations of input signal values, (namely that each configuration is equally likely). This is an interpretation of switching variables as random variables with known statistics. We can therefore define and compute the joint source entropy of sets of variables, including the output variable. We use these information quantities, or entropies, to classify switching functions into Equivalence Classes under Permutation and Complementation of input variables, and Negation of the Function. The entropies can also be used to predict some of the useful properties of switching functions, in some cases more simply than conventional methods which employ Boolean Algebra. The model also suggests a switching circuit design philosophy based on the idea of using circuit elements, or gates, to pass information in the input signals which is relevant to the output, while blocking the irrelevant information. Several algorithms are described, and their performance on the design of circuits with small numbers of variables is encouraging. The design philosophy seems particularly able to handle topological constraints, of the type becoming significant in modern switching circuit design.
Counterions release from electrostatic complexes of polyelectrolytes and proteins of opposite charge : a direct measurement
Creators: name: Gummel, Jérémie
name: Cousin, Fabrice
name: Boué, François
Publisher: name: arXiv
Year: 2009
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Though often considered as one of the main driving process of the complexation of species of opposite charges, the release of counterions has never been experimentally directly measured on polyelectrolyte/proteins complexes. We present here the first structural determination of such a release by Small Angle Neutron Scattering in complexes made of lysozyme, a positively charged protein and of PSS, a negatively charged polyelectrolyte. Both components have the same neutron density length, so their scattering can be switched off simultaneously in an appropriate "matching" solvent; this enables determination of the spatial distribution of the single counterions within the complexes. The counterions (including the one subjected to Manning condensation) are expelled from the cores where the species are at electrostatic stoichiometry.
Towards Connecting Control to Perception: High-Performance Whole-Body Collision Avoidance Using Control-Compatible Obstacles
Creators: name: Eckhoff, Moritz
name: Knobbe, Dennis
name: Zwirnmann, Henning
name: Swikir, Abdalla
name: Haddadin, Sami
Publisher: name: arXiv
Year: 2023
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: One of the most important aspects of autonomous systems is safety. This includes ensuring safe human-robot and safe robot-environment interaction when autonomously performing complex tasks or in collaborative scenarios. Although several methods have been introduced to tackle this, most are unsuitable for real-time applications and require carefully hand-crafted obstacle descriptions. In this work, we propose a method combining high-frequency and real-time self and environment collision avoidance of a robotic manipulator with low-frequency, multimodal, and high-resolution environmental perceptions accumulated in a digital twin system. Our method is based on geometric primitives, so-called primitive skeletons. These, in turn, are information-compressed and real-time compatible digital representations of the robot's body and environment, automatically generated from ultra-realistic virtual replicas of the real world provided by the digital twin. Our approach is a key enabler for closing the loop between environment perception and robot control by providing the millisecond real-time control stage with a current and accurate world description, empowering it to react to environmental changes. We evaluate our whole-body collision avoidance on a 9-DOFs robot system through five experiments, demonstrating the functionality and efficiency of our framework.
description: Published at 2023 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS 2023)
Sławomir Zatwardnicki, Ateizm urojony. Chrześcijańska odpowiedź na negację Boga, Kraków 2013
Creators: name: Tupikowski, Jerzy
Publisher: name: Wrocławski Przegląd Teologiczny
Year: 2020

description: Wrocławski Przegląd Teologiczny, Vol 21 No 2 (2013)
Non-uniqueness of the Dirac theory in a curved spacetime
Creators: name: Arminjon, Mayeul
name: Reifler, Frank
Publisher: name: arXiv
Year: 2010
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We summarize a recent work on the subject title. The Dirac equation in a curved spacetime depends on a field of coefficients (essentially the Dirac matrices), for which a continuum of different choices are possible. We study the conditions under which a change of the coefficient fields leads to an equivalent Hamiltonian operator H, or to an equivalent energy operator E. In this paper, we focus on the standard version of the gravitational Dirac equation, but the non-uniqueness applies also to our alternative versions. We find that the changes which lead to an equivalent operator H, or respectively to an equivalent operator E, are determined by initial data, or respectively have to make some point-dependent antihermitian matrix vanish. Thus, the vast majority of the possible coefficient changes lead neither to an equivalent operator H, nor to an equivalent operator E, whence a lack of uniqueness. We show that even the Dirac energy spectrum is not unique.
description: 13 pages (standard 12pt article format). Text of a talk given at the 1st Mediterranean Conference on Classical and Quantum Gravity, Kolymbari (Greece), Sept. 14-18, 2009
Rapid spin depolarization in the layered 2D Ruddlesden Popper perovskite (BA)(MA)PbI
Creators: name: Kempf, Michael
name: Moser, Philipp
name: Tomoscheit, Maximilian
name: Schröer, Julian
name: Blancon, Jean-Christophe
name: Schwartz, Rico
name: Deb, Swarup
name: Mohite, Aditya
name: Stier, Andreas V.
name: Finley, Jonathan J.
name: Korn, Tobias
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report temperature-dependent spectroscopy on the layered (n=4) two-dimensional (2D) Ruddlesden-Popper perovskite (BA)(MA)PbI. Helicity-resolved steady-state photoluminescence (PL) reveals no optical degree of polarization. Time-resolved PL shows a photocarrier lifetime on the order of nanoseconds. From simultaneaously recorded time-resolved differential reflectivity (TR$Δ$R) and time-resolved Kerr ellipticity (TRKE), a photocarrier lifetime of a few nanoseconds and a spin dephasing time on the order of picoseconds was found. This stark contrast in lifetimes clearly explains the lack of spin polarization in steady-state PL. While we observe clear temperature-dependent effects on the PL dynamics that can be related to structural dynamics, the spin dephasing is nearly T-independent. Our results highlight that spin dephasing in 2D (BA)(MA)PbI occurs at time scales faster than the exciton recombination time, which poses a bottleneck for applications aimingto utilize this degree of freedom.
Józef Pater, Ksiądz infułat dr Karol Milik jako rządca Archidiecezji Wrocławskiej w latach 1945–1951, Wrocław 2012
Creators: name: Serwatka, Tomasz
Publisher: name: Wrocławski Przegląd Teologiczny
Year: 2020

description: Wrocławski Przegląd Teologiczny, Vol 21 No 2 (2013)
Three-particle cumulant Study of Conical Emission
Creators: name: Pruneau, Claude
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We discuss the sensitivity of the three-particle azimuthal cumulant method for a search and study of conical emission in central relativistic $A+A $ collisions. Our study is based on a multi-component Monte Carlo model which include flow background, Gaussian mono-jets, jet-flow, and Gaussian conical signals. We find the observation of conical emission is hindered by the presence of flow harmonics of fourth order ($v_4 $) but remains feasible even in the presence of a substantial background. We consider the use of probability cumulants for the suppression of 2$^{nd}$ order flow harmonics. We find that while probability cumulant significantly reduce $v_2^2$ contributions, they also complicate the cumulant of jets, and conical emission. The use of probability cumulants is therefore not particularly advantageous in searches for conical emission. We find the sensitivity of the (density) cumulant method depends inextricably on strengths of $v_2 $, $v_4 $, background and non-Poisson character of particle production. It thus cannot be expressed in a simple form, and without specific assumptions about the values of these parameters.
description: 12 figures, accepted for publication in PRC
Tension dynamics and viscoelasticity of extensible wormlike chains
Creators: name: Obermayer, B.
name: Frey, E.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The dynamic response of prestressed semiflexible biopolymers is characterized by the propagation and relaxation of tension, which arises due to the near inextensibility of a stiff backbone. It is coupled to the dynamics of contour length stored in thermal undulations, but also to the local relaxation of elongational strain. We present a systematic theory of tension dynamics for stiff yet extensible wormlike chains. Our results show that even moderate prestress gives rise to distinct Rouse-like extensibility signatures in the high-frequency viscoelastic response.
description: 4 pages, 1 figure; corrected typos
Tomasz Stępień, Europa wobec cywilizacji. Antona Hilckmana porównawcza nauka o cywilizacjach: Zasady – Metoda – Zastosowanie, Toruń 2013
Creators: name: Szopa, Rafał
Publisher: name: Wrocławski Przegląd Teologiczny
Year: 2020

description: Wrocławski Przegląd Teologiczny, Vol 21 No 2 (2013)
title: Rezension zu: Gloy, Horst: Religiöse Ansprechbarkeit und Dialog. Texte zum Religionsunterricht aus vier Jahrzehnten, Münster / New York: Waxmann 2021.
Creators: name: Mette, Norbert
Publisher: name: Universität Graz
Year: 2021

description: Österreichisches Religionspädagogisches Forum 29 (2021) 2 • 245–249
Gas chromatographic identification of trace amounts of organic compounds
Creators: name: Dineen, Robert Denison
Publisher: name: University Of Tasmania
Year: 2023

description: Methods for the identification of gas chromatographic separated components of essential oils have been investigated. The use of relative retention data was found to be of value for identification only when known standards are available for comparison. Tabulated Kovats indices, available from references, were found to be unreliable for the identification of unknown compounds. These techniques may be of value for preliminary identification of some compounds, however it was found that spectroscopic and chemical reaction data were necessary in order to postively identify unknown compounds. Combined gas chromatography - mass spectrometry computer techniques enabled the rapid identification of the majority of compounds present in these complex mixtures. Compounds identified by this technique were found to be in agreement with many previously identified by retention data. There were limitations in the identification of compounds with similar spectra and the spectra of unknown compounds not being included in the data base. Where other spectroscopic data was necessary for identification purposes, an off-line gas chromatographic sampling device was constructed which enabled the collection of nanogram amounts of compounds eluting from a gas chromatographic column. Compounds collected this way were able to have their Raman spectra recorded without any further sample manipulation. The technique was also used for the recording of infrared, and nuclear magnetic resonance spectra enabling positive identification of some compounds. Techniques of reaction gas chromatography mass spectrometry were developed. Hydrogenation techniques were found useful for the determination of the number of double bonds in a compound whilst carbon skeleton chromatography - mass spectromatry was used for the identification of the hydrocarbon skeleton of unidentified compounds. Subtraction gas chromatography enabled the tentative identification of the alcohol functional group in some compounds. It was concluded that, due to the complex nature of the essential oils investigated, a single technique is not available that enables complete identification of all components. A combination of all these methods must often be used for the complete identification of components in essential oils.
Reformpädagogik in der DDR
Creators: name: Koch, Katja
name: Koebe, Kristina
Publisher: name: Universität Rostock, Arbeitsstelle Pädagogische Lesungen Rostock
Year: 2019
Subjects: subject: 370 Education
subject: 943 General history of Europe Central Europe Germany

description: Sowohl im gesellschaftlichen Narrativ als auch in fachwissenschaftlichen Darstellungen wird das DDR-Bildungssystem als wenig fruchtbarer Boden für reformpädagogische Ansätze beschrieben. Bei genauerer Betrachtung bedarf diese Einschätzung jedoch mehrerer Korrekturen. Der Beitrag gibt zunächst einen kurzen Abriss der Entwicklungsphasen des DDR-Bildungssystems und skizziert differenziert das jeweilig vorherrschende Verhältnis zur Reformpädagogik. Dabei werden wesentliche Einflüsse reformpädagogischen Gedankengutes auf das DDR-Bildungssystem ebenso sichtbar wie deutliche Differenzlinien. Im zweiten Teil wird die pädagogische Praxis im DDR-Hilfsschulsystem anhand ausgewählter Pädagogischer Lesungen betrachtet.
Ks. Andrzej Hanich, Ksiądz infułat Bolesław Kominek, pierwszy administrator apostolski Śląska Opolskiego (1945–1951), Opole 2012, t. 1. Ks. Bolesław Kominek . Wspomnienia i dokumenty pastoralne pierwszego administratora apostolskiego Śląska Opolskiego
Creators: name: Jerzak, Norbert
Publisher: name: Wrocławski Przegląd Teologiczny
Year: 2020

description: Wrocławski Przegląd Teologiczny, Vol 21 No 2 (2013)
On the global existence of time
Creators: name: Minguzzi, E.
Publisher: name: arXiv
Year: 2009
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The existence of a global time is often taken for granted but should instead be considered as a matter of investigation. By using the tools of global Lorentzian geometry I show that, under physically reasonable conditions, the impossibility of finding a global time implies the singularity of spacetime.
description: 11 pages, 3 figures. Third juried prize at the FQXi contest "The nature of time". In this version some misprints have been fixed, and some references have been updated
Application of Efron-Petrosian method to radio pulsar fluxes
Creators: name: Mamidipaka, Pragna
name: Desai, Shantanu
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We apply the Efron-Petrosian technique to radio fluxes of pulsars detected in the Parkes multi-beam survey to test the independence of luminosity and distance. For this dataset, we find that for four different distance exponents (ranging from 0.5 to 2), the flux thresholds at which the luminosity and distances are uncorrelated, correspond to very low $p$-values for the Kolmogorov-Smirnov test between the truncated and untruncated datasets. This is due to the fact that the Parkes multi-beam survey is not sufficiently homogeneous to lend itself to a treatment by the Efron-Petrosian method. We then repeat the analysis after rendering the dataset more homogeneous by excluding the distant pulsars from this sample. We find that for this culled dataset, the flux is consistent with distance exponents of 1.5 and 2.0.
description: 7 pages, 6 figures. Accepted for publication in JCAP
All-optical conditional logic with a nonlinear photonic crystal nanocavity
Creators: name: McCutcheon, Murray W.
name: Rieger, Georg W.
name: Young, Jeff F.
name: Dalacu, Dan
name: Poole, Philip J.
name: Williams, Robin L.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We demonstrate tunable frequency-converted light mediated by a chi-(2) nonlinear photonic crystal nanocavity. The wavelength-scale InP-based cavity supports two closely-spaced localized modes near 1550 nm which are resonantly excited by a 130 fs laser pulse. The cavity is simultaneously irradiated with a non-resonant probe beam, giving rise to rich second-order scattering spectra reflecting nonlinear mixing of the different resonant and non-resonant components. In particular, we highlight the radiation at the sum frequencies of the probe beam and the respective cavity modes. This would be a useful, minimally-invasive monitor of the joint occupancy state of multiple cavities in an integrated optical circuit.
description: 4 pages, 4 figures
Tomasz Serwatka, Kardynał Bolesław Kominek (1903-1974). Duszpasterz i polityk. Zarys biograficzny. Wrocław 2013
Creators: name: Dziuba, Andrzej Franciszek
Publisher: name: Wrocławski Przegląd Teologiczny
Year: 2020

description: Wrocławski Przegląd Teologiczny, Vol 21 No 2 (2013)
The Commonwealth Schools Commission 1973-1982 : a case study of federal intervention in Australian education
Creators: name: Gillespie, CF
Publisher: name: University Of Tasmania
Year: 2023

description: The interactive relationship between schools and society is very complex and any attempt to affect this could have major consequences. Harman and Smart (1981) in discussing the scope of Commonwealth intervention in Australian education consider that: \Federal Government intervention constitutes one of the most important and yet at the same time one of the least under-stood dimensions of Australian education. For over forty years since the Second World War under a succession of Australian Prime Ministers - Menzies Holt Gorton McMahon Whitlam and to some extent Fraser the Commonwealth Government has enlarged and diversified the Federal presence in education\". (P vii) Establishment of the Commonwealth. Schools Commission in 1973 should then be seen in the context of this gradually expanded Commonwealth: role in an area that has traditionally been seen as an area of State responsibility. In this case study it is intended to present an historical overview of the development of the Commission as part of the expanded Commonwealth education function)and attempt to explain how this role has changed. However while advancing reasons for these changes that can be substantiated by the literature this will need to be set in the context of a political and economic environment that has changed significantly since 1972."
Tailoring higher-order van Hove singularities in non-Hermitian interface systems via Floquet engineering
Creators: name: Banerjee, Ayan
name: Chowdhury, Debashree
name: Narayan, Awadhesh
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose a non-Hermitian (NH) interface system formed between two NH nodal line semimetals driven by optical fields as a platform for generation and tailoring of higher-order van Hove singularities (VHS). Through an analytical analysis of the density of states (DOS), we find VHS with logarithmic divergences in the Hermitian limit. Upon introducing NH terms, four exceptional rings on two sides of the Fermi line are formed. By tuning the NH parameters and the light amplitude, we find a situation when one exceptional ring crosses the Fermi line, where a saddle point appears and results in a paired VHS around the origin. In contrast, when an exceptional contour resides at the Fermi energy, the saddle points critically get destroyed and we obtain a single peak in the DOS, with power-law divergences. These higher-order divergences that appear in an NH system have a different origin than that of the higher-order VHS in Hermitian systems, where no saddle point merging is noted. Our results suggest NH interfaces to be promising avenues for exploring higher-order VHS.
description: 7 Pages, 3 Figures
The quest for effective co-ordination : a review of attempts to achieve effective co-ordination of services for intellectually disabled people
Creators: name: De Vries, M H
Publisher: name: University Of Tasmania
Year: 2023

description: In the decade 1975-84 considerable attention was given by a wide variety of persons and agencies in Tasmania to the review and/or evaluation of services provided to intellectually disabled persons and their families. Whether in the form of single case clinical case studies on the one hand or an in-depth review of the totality of services on the other hand, all such studies made observations, comment, or recommendations pertinent to effecting improvements in the manner services are provided, either in the small scale relating to particular programs or in the large scale relating to particular agencies, or in the macro scale relating to services as a whole.
Dwieście lat niepodległości państw Ameryki Łacińskiej. Perspektywa historyczna i wyzwania współczesności (red. nauk. K. Krzywicka), Lublin 2012
Creators: name: Dziuba, Andrzej Franciszek
Publisher: name: Wrocławski Przegląd Teologiczny
Year: 2020

description: Wrocławski Przegląd Teologiczny, Vol 21 No 2 (2013)
Learning to read : making the task easier in early childhood classes
Creators: name: Hart, MA
Publisher: name: University Of Tasmania
Year: 2023

description: \Reading is not the mastery of a single learning task. There are numerous elements which must come together meaningfully\" (Watson & Badenhop1992 p.16). A successful reading program consists of more than a reading method; there are several connecting parts. If students are to learn to read then they must understand what it means to read and they must believe that they would like to read. Reading needs to be seen as a purposeful and meaningful activity. This paper explores the features of a successful classroom reading program. It looks at how teachers can organise reading in ways which build on from the successful language learning that children have already accomplished in their homes and communities. The school is a key factor in facilitating reading success and will be held accountable to a large extent for the reading successes or failures of its students. The community expectation is that almost all students will master the basics of literacy. \"While the backgrounds of the children can influence the ease with which they become literate most children in the first year of school can learn to read irrespective of home background and the location type or size of school. Schools clearly are responsible to provide students with effective literacy instruction\" (House of Representatives Standing Committee It is through reading that children learn to read. Part of a teacher's role is to make reading easy and enjoyable for every student. \"Every teacher worth her salts wants her pupils to be competent and sensitive readers\" (Meek1982 p.10). This paper discusses how this happens. Teachers need to reflect on those characteristics that identify good classroom practice and the effective teaching and learning of reading. In a quality early childhood classroom where reading is valued and successful: how will the classroom look?; what will the students be doing?; what will the teacher be doing? What classroom characteristics nurture beginning readers? This paper explores the conditions which facilitate success in learning to read for every student in the class. It looks at preventing reading difficulties from developing. Prevention is considered in an absolute sense: preventing reading failure in the initial instance when students are introduced to reading during their early school years. How can we best ensure that students are introduced to reading in such a way that they succeed? This requires careful planning skilled teaching and early intervention in the first years of schooling to assist students as necessary before they experience a sense of failure."