cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Impact Welding in a Variety of Geometric Configurations
Creators: name: Babu, S.
name: Daehn, G. S.
name: Zhang, Y.
Publisher: name: Institut für Umformtechnik - Technische Universität Dortmund
Year: 2010
Subjects: subject: impact welding
subject: magnetic pulse welding
subject: welding configuration
subject: 620
subject: 670

description: Magnetic pulse welding is an electromagnetically assisted high strain rate impact welding technology. The physical principle is similar to explosive welding and it also belongs to solid state impact welding. This high velocity oblique impact welding has been applied to various lap joint configurations. Three different geometric configurations on plate-to-plate welding were studied in this paper. They are direct lap joint, pre-flange lap joint, and lap joint with embedded wires. All of the three welding configurations have been used to provide metallurgical bonds between both similar and dissimilar metal pairs. The welded materials include copper alloy, aluminium alloy, and steels. The plates are centimeter or more thick and often centimeter in extent. The critical welding process parameters were instrumentally investigated by Rogowski Coil and Photon Doppler Velocimetry. Metallographic analysis of the welded interface showed refined grain structure. The mechanical properties of the welded plates were studied by lap shearing, peeling and nano-indentation tests. The test results showed that the impact welded interface has a much greater micro-hardness and fracture toughness than the base metals.
Top-antitop production from $W_L^+ W_L^-$ and $Z_L Z_L$ scattering under a strongly-interacting symmetry-breaking sector
Creators: name: Castillo, Andrés
name: Delgado, Rafael L.
name: Dobado, Antonio
name: Llanes-Estrada, Felipe J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: By using a Non-linear Electroweak Chiral Lagrangian, including the Higgs, coupled to heavy quarks, and the Equivalence Theorem, we compute (in the regime $M_t^2/v^2\ll\sqrt{s}M_t/v^2\ll s/v^2$) the one-loop amplitudes $W^+W^-\to t\bar t$, $ZZ\to t\bar t$ and $hh\to t\bar t$ (to NLO in the effective theory). We calculate the scalar partial-wave helicity amplitudes which allow us to check unitarity at the perturbative level in both $M_t/v$ and $s/v$. As with growing energy perturbative unitarity deteriorates, we also introduce a new unitarization method with the right analytical behavior on the complex $s$-plane and that can support poles on the second Riemann sheet to describe resonances in terms of the Lagrangian couplings. Thus we have achieved a consistent phenomenological description of any resonant $t\bar t$ production that may be enhanced by a possible strongly interacting Electroweak Symmetry Breaking Sector.
description: 13 pages, 12 figures
The Mechanical Behaviour of Ultra Fine Grained Titanium Alloys at High Strain Rates
Creators: name: Halle, T.
name: Herzig, N.
name: Krüger, L.
name: Meyer, L. W.
name: Musch, D.
name: Razorenov, S. V.
name: Skripnyak, E. G.
name: Skripnyak, V. A.
Publisher: name: Institut für Umformtechnik - Technische Universität Dortmund
Year: 2008
Subjects: subject: high strain rate
subject: impact
subject: material
subject: ultra-fine grain
subject: 620
subject: 670

description: Within this study the mechanical behaviour of ultra-fine grained Ti-6-22-22S titanium alloy was investigated and compared to coarse grained material. By severe plastic deformation using the cyclic channel die compression process, grain sizes between 300 and 500 nm were obtained. The mechanical behaviour was studied over a wide range of strain rates from 10^(-3) - 107 s^(-1) under compressive loading using different experimental techniques. A significant increase of flow stress with decreasing grain size compared to the coarse grain state was found. An evaluation of the strain hardening behaviour of the UFG material shows a significant increase of the strain hardening coefficient at high strain rates for low plastic deformation. The strain rate sensitivity of the material is found to be constant within a range of strain rates from 10^(-3) to 106 s^(-1) but increases at higher plastic strains. However, compressive deformability is nearly constant up to 102 s-1 and decreased disproportionately at higher rates of strain. With decreasing grain size a significant decrease of compressive deformability was found. The strength at failure is increased with increasing strain rate.
Arbitrarily Accurate Pulse Sequences for Robust Dynamical Decoupling
Creators: name: Genov, Genko T.
name: Schraft, Daniel
name: Vitanov, Nikolay V.
name: Halfmann, Thomas
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We introduce universally robust sequences for dynamical decoupling, which simultaneously compensate pulse imperfections and the detrimental effect of a dephasing environment to an arbitrary order, work with any pulse shape, and improve performance for any initial condition. Moreover, the number of pulses in a sequence grows only linearly with the order of error compensation. Our sequences outperform the state-of-the-art robust sequences for dynamical decoupling. Beyond the theoretical proposal, we also present convincing experimental data for dynamical decoupling of atomic coherences in a solid-state optical memory.
title: Essays on exchange rate determination : an analysis of industrialised and emerging markets
Creators: name: Ferreira, Jose Eduardo de Andrade
Publisher: name: University of Kent
Year: 2023

description: The main contribution of this thesis is to assess the importance of economic fundamentals in affecting the nominal exchange rate behaviour for a sample of industrialised and emerging market economies. Industrialised and emerging markets differ in terms of economic stability conditions that may affect distinctly he performance of traditional exchange rate models. The thesis consists of investigating the effects of three interrelated determinants on the exchange rate variability which are examined from the early 1980s until the early 2000s: the effect of monetary fundamentals, the effect of rational speculative bubbles and the effect of foreign debt. Firstly, we test the monetary model for both types of market economies by making use of panel techniques that allow for a high degree of heterogeneity across countries. We find partial support for the monetary model for industrialised market economies but not for emerging ones. This constitutes a puzzle as we would expect countries with greater monetary instability to show a stronger association between exchange rates and monetary fundamentals. Secondly, we test for the presence of a rational speculative bubble driving the stochastic process of exchange rates away from the equilibrium level defined by monetary fundamentals. Our findings reveal that the hypothesis of periodically collapsing bubbles driving the exchange rate away from the fundamentals solution cannot be accepted for a sample of four industrialised market economy countries. Moreover, the results also revealed significant non-linearities and different regimes. The importance of these findings suggests that linear monetary models may not be appropriate to examine exchange rate movements. Finally, we investigate the effects of foreign debts on nominal exchange rate volatility for a sample of industrialised and emerging market economies where the level of foreign indebtedness and the access to international credit markets differ substantially. We also test for the use of monetary policy and international reserves to stabilise potential exchange rate volatility. Our findings confirm that foreign debts do generate effects on exchange rate volatility in both types of market economies, with more significant impacts on financially fragile economies (emerging markets). The results also revealed that monetary authority interventions in the foreign exchange market are a common practice in both categories of economies. The importance of these findings commends government authorities to keep foreign debt at levels consistent with macroeconomic stability.
Cultural and religious beliefs among Vietnamese immigrants in Melbourne
Creators: name: Daw, Joan Margaret.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Salomon Hirzel: Pariser Tagebuch
Creators: name: Hirzel, Salomon
Publisher: name: [s.n.]
Year: 1634

description: Pariser Tagebuch, 1634-1635, verfasst von Salomon Hirzel (1580-1652) als Teilnehmer der Mission der Evangelischen Orte und Zugewandten betr. die Handelsprivilegien
Schriftproben aus dem 14., 15. und 16. Jahrhundert
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1800

description: Enthält die erste(n) Zeile(n) von deutschsprachigen Urkunden und Briefen der Jahre 1377-1506, sowie Alphabete.

Usteri schrieb diese Zeilen nicht nur ab, sondern imitierte die jeweilige Handschrift.
'Waiting on the weather' : the Australian National Antarctic Research Expedition at Heard Island 1947-1955
Creators: name: Munro, Geoffrey D. .
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Energy shift of H-atom electrons due to Gibbons-Hawking thermal bath
Creators: name: Pardy, Miroslav
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: The electromagnetic shift of energy levels of H-atom electrons is determined by calculating an electron coupling to the Gibbons-Hawking electromagnetic field thermal bath. Energy shift of electrons in H-atom is determined in the framework of the non-relativistic quantum mechanics.
description: 7 pages
Charge diffusion and the butterfly effect in striped holographic matter
Creators: name: Lucas, Andrew
name: Steinberg, Julia
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Recently, it has been proposed that the butterfly velocity - a speed at which quantum information propagates - may provide a fundamental bound on diffusion constants in dirty incoherent metals. We analytically compute the charge diffusion constant and the butterfly velocity in charge-neutral holographic matter with long wavelength "hydrodynamic" disorder in a single spatial direction. In this limit, we find that the butterfly velocity does not set a sharp lower bound for the charge diffusion constant.
description: 16+7 pages; 1 figure. v2: published version
Proof of de Smit's conjecture: a freeness criterion
Creators: name: Brochard, Sylvain
Publisher: name: arXiv
Year: 2016
Subjects: subject: Commutative Algebra (math.AC)
subject: Algebraic Geometry (math.AG)
subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 13C10, 11F80, 14A05

description: Let $A\to B$ be a morphism of Artin local rings with the same embedding dimension. We prove that any $A$-flat $B$-module is $B$-flat. This freeness criterion was conjectured by de Smit in 1997 and improves Diamond's Theorem 2.1 from his 1997 paper "The Taylor-Wiles construction and multiplicity one". We also prove that if there is a nonzero $A$-flat $B$-module, then $A\to B$ is flat and is a relative complete intersection (i.e. $B/\mathfrak{m}_AB$ is a complete intersection). Then we explain how this result allows to simplify Wiles's proof of Fermat's Last Theorem: we do not need the so-called "Taylor-Wiles systems" anymore.
description: final version, to appear in Compositio Mathematica
A thermodynamic cycle for the solar cell
Creators: name: Alicki, Robert
name: Gelbwaser-Klimovsky, David
name: Jenkins, Alejandro
Publisher: name: arXiv
Year: 2016
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A solar cell is a heat engine, but textbook treatments are not wholly satisfactory from a thermodynamic standpoint, since they present solar cells as directly converting the energy of light into electricity, and the current in the circuit as maintained by an electrostatic potential. We propose a thermodynamic cycle in which the gas of electrons in the p phase serves as the working substance. The interface between the p and n phases acts as a self-oscillating piston that modulates the absorption of heat from the photons so that it may perform a net positive work during a complete cycle of its motion, in accordance with the laws of thermodynamics. We draw a simple hydrodynamical analogy between this model and the "putt-putt"' engine of toy boats, in which the interface between the water's liquid and gas phases serves as the piston. We point out some testable consequences of this model.
description: 17 pages, 9 figures. v2: Clarified use of "local" temperature in Sec. V and added corresponding plot. Other minor points elucidated, references improved. To appear in Annals of Physics
Joining of Copper to Brass Using Magnetic Pulse Welding
Creators: name: Baaten, T.
name: Debroux, N.
name: De Waele, W.
name: Faes, K.
Publisher: name: Institut für Umformtechnik - Technische Universität Dortmund
Year: 2010
Subjects: subject: brass
subject: copper
subject: magnetic pulse welding
subject: 620
subject: 670

description: In magnetic pulse welding, electromagnetic pressure is used to deform, accelerate and weld workpieces. The process is mostly used for tubular specimens. In this study, experiments were performed in order to investigate the weldability of copper tubes to brass solid workpieces. The tubes had an outer diameter and wall thickness of 25,0 mm and 1,5 mm respectively. A multi-turn coil with 5 windings in combination with a field shaper was used to focus the electromagnetic flux and thus realize the high pressures needed for welding. The process parameters for joining these materials were optimised for maximum weld length. The parameters taken into account were the position of the field shaper relative to the workpieces, the width of the air gap between the tube and the internal workpiece and the energy level. The weld quality was verified based on metallographic examinations, scanning electron microscopy and hardness measurements.
Modelling low-velocity impact damage and compression after impact of 3D woven structures considering compaction
Creators: name: Millen, S.L.J.
name: Dahale, M.
name: Fisher, T
name: Samy, A.
name: Thompson, K
name: Ramaswamy, Karthik
name: Ralph, C.
name: Archer, E
name: McIlhagger, A.
name: Ullah, Z
name: Falzon, B.G.
Publisher: name: University of Limerick
Year: 2023
Subjects: Engineering

description: A novel finite element modelling approach is presented which incorporates representative binder yarn compaction, for simulating the low-velocity impact (LVI) and compression after impact (CAI) response of 3D woven layer-to-layer carbon/epoxy composite architectures. Simulations of out-of-plane drop-weight impact tests were performed at energies of 32 J and 42 J. Warp and weft layers were modelled as continuous plies and three different approaches were explored to model the binder reinforcement; (i) with a rectangular cross-section and non-compacted, (ii) with an elliptical cross-section and non-compacted, and (iii) an elliptical cross-section which accounts for compaction. Predictions were compared with experimental results from literature and it is shown that modelling the binder reinforcement as an elliptical cross-section with compaction leads to a predicted damage area, on the impacted side, which is within 2%, and the non-impacted side within 6% of experimental measurements. The predicted CAI strength is within 11% of the experimental values.
Pellitero, Ramiro, La teologia del laicado en la obra de Yves Congar
Creators: name: Bleyenberg, Ursula
Publisher: name: Forum Katholische Theologie
Year: 1970

description: Forum Katholische Theologie, Bd. 13 Nr. 4 (1997): Forum Katholische Theologie, Band 13, Heft 4
Assessing the Effective Energy for Magnetic Forming Processes by Means of Measurements and Numerical Calculation
Creators: name: Kulig, S.
name: Peier, D.
name: Rosendahl, J.
name: Werdelmann, P.
Publisher: name: Institut für Umformtechnik - Technische Universität Dortmund
Year: 2008
Subjects: subject: electromagnetic Forming
subject: energetic Efficiency
subject: measurements
subject: 620
subject: 670

description: The efficiency of magnetic sheet metal forming processes is strongly depending on the facility s overall design. This mainly includes the geometric layout of forming tool, work piece and matrix but, however, will also expect the energy storage device being taken into consideration. Apart from field theoretic models the energy storage is describable by its terminal traits which the electric load - tool coil and work piece - is connected to. The paper presents a measuring method for the tool coil s terminal quantities, current i(t) and voltage u(t), which are used to provide the electric power p(t) being transferred to the load. Thus, it is possible to determine the entire energy which is dissipated by the work piece, provided that the coil s resistance is known. Besides the measurement, this approach is supported by numerical calculation intending to take a closer look at the inner losses of the work piece which are not accessible from measuring the system s terminal traits directly. Dividable into separate parts of the total energy, this information is applied to assess the forming process by means of the facility s energetic performance and to draw an overall energy balance.
Fehleranalysen bei Studienanfängern als Basis zur individuellen Förderung in Mathematik
Creators: name: Neugebauer, Christoph
name: Winter, Kathrin
Publisher: name: Gesellschaft für Didaktik der Mathematik
Year: 2014
Subjects: subject: 510

description: An der WWU Münster werden neue Studieneingangstests entwickelt, die mathematische Anforderungen bestimmter Studiengänge an konkreten Aufgabenbeispielen thematisieren und Studieninteressierten die Möglichkeit bieten, ihre eigenen Kompetenzen hinsichtlich dieser Anforderungen zu überprüfen (vgl. Neugebauer 2013). Diese online zur Verfügung gestellten Self-Assessments bieten durch eine fundierte diagnostische Aufbereitung sofortige detaillierte und individuelle Rückmeldungen zu den Kompetenzen der sich testenden Person. So bilden sie eine auf die Studieninteressen, die persönlichen Kompetenzen und die jeweiligen Anforderungen eines Studiengangs angepasste Grundlage für die eigene Förderung inklusive konkreter Hinweise zu Lehr- und Lernangeboten. In diesem Beitrag werden die grundsätzlichen Ideen und erste Ergebnisse zum Einsatz fehleranalytischer Methoden bei der Entwicklung von Itemdistraktoren mit diagnostischem Potential exemplarisch zu verdeutlichen.
Development dilemmas in the South Pacific
Creators: name: Campbell, Vilaisan.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Direct-dynamical entanglement-discord relations
Creators: name: Feldman, Virginia
name: Maziero, Jonas
name: Auyuanet, A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: Information Theory (cs.IT)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: In this article, by considering Bell-diagonal two-qubit initial states submitted to local dynamics generated by the phase damping, bit flip, phase flip, bit-phase flip, and depolarizing channels, we report some elegant direct-dynamical relations between geometric measures of entanglement and discord. The complex scenario appearing already in this simplified case study indicates that similarly simple relation shall hardly be found in more general situations.
description: 7 pages, 3 figures, Published version
Causes of mass incarceration and how to achieve reform
Creators: name: Misko, Jude
Publisher: name: No Publisher Supplied
Year: 2022

description: Mass incarceration is a term used to describe the United States locking up people in prisons and jails. But why does the United States lock up more people than any country in the world? It was not until the 1970s until incarceration rates began to increase rapidly. This was in response to the growing fear of drugs and crime, so legislatures began to pass tough on crime policies that would send people to prisons and jails. Simultaneously, during the Reagan administration the idea and term “War on Drugs” would spread fear across the nation of drugs and persons with substance use disorders. Furthermore, a disproportionate amount of individuals of color and low socioeconomic status were targeted and sent to prison. Reviewing previous literature on crime policies, war on drugs, and racial disparities will provide the understanding for how the United States got here. Then how does the United States see a reduction in incarceration rates and admissions? Regulating oversight of the prosecutor, investing back into communities and redefining how we sentence violent crimes all are theoretical and practical policy implications to see a reduction in prison admissions and growth.
Speaking the body : theorising Marguerite Duras
Creators: name: Troup, Magdalen Naomi.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
title: Conformational changes of a chemically modified HRP
title: formation of a molten globule like structure at pH 5
titleType: AlternativeTitle
Creators: name: Bamdad, Kourosh
name: Ranjbar, Bijan
name: Naderi-Manesh, Hossein
name: Sadeghi, Mehdi
Publisher: name: Technische Universität Dortmund
Year: 2014
Subjects: subject: Horseradish peroxidase
subject: conformational transition
subject: molten globule like structure
subject: 610

description: Horseradish peroxidase is an all alpha-Helical enzyme, which widely used in biochemistry applications mainly because of its ability to enhance the weak signals of target molecules. This monomeric heme-containing plant peroxidase is also used as a reagent for the organic synthesis, biotransformation, chemiluminescent assays, immunoassays, bioremediation, and treatment of wastewaters as well. Accordingly, enhancing stability and catalytic activity of this protein for biotechnological uses has been one of the important issues in the field of biological investigations in recent years. In this study, pH-induced structural alterations of native (HRP), and modified (MHRP) forms of Horseradish peroxidase have been investigated. Based on the results, dramatic loss of the tertiary structure and also the enzymatic activity for both forms of enzymes recorded at pH values lower than 6 and higher than 8. Ellipticiy measurements, however, indicated very slight variations in the secondary structure for MHRP at pH 5. Spectroscopic analysis also indicated that melting of the tertiary structure of MHRP at pH 5 starts at around 45° C, which is associated to the pKa of His 42 that has a serious role in keeping of the heme prostethic group in its native position through natural hydrogen bond network in the enzyme structure. According to our data, a molten globule like structure of a chemically modified form of Horseradish peroxidase at pH 5 with initial steps of conformational transition in tertiary structure with almost no changes in the secondary structure has been detected. Despite of some conformational changes in the tertiary structure of MHRP at pH 5, this modified form still keeps its catalytic activity to some extent besides enhanced thermal stability. These findings also indicated that a molten globular state does not necessarily preclude efficient catalytic activity.
description: EXCLI Journal ; Vol. 13, 2014
The Low-Code Phenomenon: Mapping the Intellectual Structure of Research
Creators: name: Naqvi, Syed Asad Ali
name: Zimmer, Markus
name: Drews, Paul
name: Lemmer, Kristina
name: Basole, Rahul C.
Publisher: name: Zenodo
Year: 2024
Subjects: Low-code
Intellectual Structure
Bibliometrics
Low-code platform (LCP)
LCP affordances.
Visualization

description: The term low-code has been closely associated with simplifying and accelerating software development. Driven by the idea that low-code can help to meet the increased digitalization demands, the low-code phenomenon is rising in academia and industry. This resulted in an immense increase in publications on low-code, posing the question of what research streams characterize the low-code literature. Conducting bibliometric analysis on 725 articles, we unpack the intellectual structure of low-code literature and uncover how it relates to other research fields. Our contribution is to clarify the conceptual understanding of low-code by identifying six research streams, namely, origins of low-code within software engineering (SE), low-code as an enabler for emerging SE trends, workplace transformation, establishing low-code methodologies, understanding low-code adoption and leveraging low-code for digital transformation. We conclude with future research directions that still need to be explored within the low-code literature.
A Bayesian Network Approach to Assess and Predict Software Quality Using Activity-Based Quality Models
Creators: name: Wagner, Stefan
Publisher: name: arXiv
Year: 2016
Subjects: subject: Software Engineering (cs.SE)
subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: Context: Software quality is a complex concept. Therefore, assessing and predicting it is still challenging in practice as well as in research. Activity-based quality models break down this complex concept into concrete definitions, more precisely facts about the system, process, and environment as well as their impact on activities performed on and with the system. However, these models lack an operationalisation that would allow them to be used in assessment and prediction of quality. Bayesian networks have been shown to be a viable means for this task incorporating variables with uncertainty. Objective: The qualitative knowledge contained in activity-based quality models are an abundant basis for building Bayesian networks for quality assessment. This paper describes a four-step approach for deriving systematically a Bayesian network from an assessment goal and a quality model. Method: The four steps of the approach are explained in detail and with running examples. Furthermore, an initial evaluation is performed, in which data from NASA projects and an open source system is obtained. The approach is applied to this data and its applicability is analysed. Results: The approach is applicable to the data from the NASA projects and the open source system. However, the predictive results vary depending on the availability and quality of the data, especially the underlying general distributions. Conclusion: The approach is viable in a realistic context but needs further investigation in case studies in order to analyse its predictive validity.
description: 32 pages, 6 figures
Magnetoresistance of vertical Co-graphene-NiFe junctions controlled by charge transfer and proximity-induced spin splitting in graphene
Creators: name: Asshoff, P. U.
name: Sambricio, J. L.
name: Rooney, A. P.
name: Slizovskiy, S.
name: Mishchenko, A.
name: Rakowski, A. M.
name: Hill, E. W.
name: Geim, A. K.
name: Haigh, S. J.
name: Fal'ko, V. I.
name: Vera-Marun, I. J.
name: Grigorieva, I. V.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Graphene is hailed as an ideal material for spintronics due to weak intrinsic spin-orbit interaction that facilitates lateral spin transport and tunability of its electronic properties, including a possibility to induce magnetism in graphene. Another promising application of graphene is related to its use as a spacer separating ferromagnetic metals (FMs) in vertical magnetoresistive devices, the most prominent class of spintronic devices widely used as magnetic sensors. In particular, few-layer graphene was predicted to act as a perfect spin filter. Here we show that the role of graphene in such devices (at least in the absence of epitaxial alignment between graphene and the FMs) is different and determined by proximity-induced spin splitting and charge transfer with adjacent ferromagnetic metals, making graphene a weak FM electrode rather than a spin filter. To this end, we report observations of magnetoresistance (MR) in vertical Co-graphene-NiFe junctions with 1 to 4 graphene layers separating the ferromagnets, and demonstrate that the dependence of the MR sign on the number of layers and its inversion at relatively small bias voltages is consistent with spin transport between weakly doped and differently spin-polarized layers of graphene. The proposed interpretation is supported by the observation of an MR sign reversal in biased Co-graphene-hBN-NiFe devices and by comprehensive structural characterization. Our results suggest a new architecture for vertical devices with electrically controlled MR.
description: 12 pages, 6 figures, Supplementary Information (6 Supplementary Notes, 11 supplementary figures)
Stylistic diversity and the "Zelig" principle in the orchestral works of George Dreyfus from the first to the second symphonies : 1967-1976
Creators: name: McClean, George Matthew.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Longitudinal fluctuations in the Berezinskii-Kosterlitz-Thouless phase
Creators: name: Jakubczyk, Pawel
name: Metzner, Walter
Publisher: name: arXiv
Year: 2016
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Superconductivity (cond-mat.supr-con)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We analyze the interplay of longitudinal and transverse fluctuations in a $U(1)$ symmetric two-dimensional $ϕ^4$-theory. To this end, we derive coupled renormalization group equations for both types of fluctuations obtained from a linear (cartesian) decomposition of the order parameter field. Discarding the longitudinal fluctuations, the expected Berezinskii-Kosterlitz-Thouless (BKT) phase characterized by a finite stiffness and an algebraic decay of order parameter correlations is recovered. Renormalized by transverse fluctuations, the longitudinal mass scales to zero, so that longitudinal fluctuations become increasingly important for small momenta. Within our expansion of the effective action, they generate a logarithmic decrease of the stiffness, in agreement with previous functional renormalization group calculations. The logarithmic terms imply a deviation from the vanishing beta-function for the stiffness in the non-linear sigma model describing the phase fluctuations at three-loop order. To gain further insight, we also compute the flow of the parameters characterizing longitudinal and transverse fluctuations from a density-phase representation of the order parameter field, with a cutoff on phase fluctuations. The power-law flow of the longitudinal mass and other quantities is thereby confirmed, but the stiffness remains finite in this approach. We conclude that the marginal flow of the stiffness obtained in the cartesian representation is an artifact of the truncated expansion of momentum dependences.
description: Updated version. Substantial changes in Title, Abstract, Conclusion. New Section V
Effekte einer Lehrerfortbildung zur Förderung von Problemlösenlernen in Kombination mit Selbstregulation im Mathematikunterricht der Sekundarstufe I
Creators: name: Collet, Christina
name: Bruder, Regina
Publisher: name: Gesellschaft für Didaktik der Mathematik
Year: 2007
Subjects: subject: 510

description: Im Vortrag wurden ausgewählte Ergebnisse einer Lehrerfortbildung zum mathematischen Problemlösenlernen in Verbindung mit Selbstregulation vorgestellt. Im Mittelpunkt standen Ergebnisse von Stundenberichten und Arbeitsprodukten der Lehrkräfte. Die über mehrere Wochen dokumentierten Unterrichtsstunden und die von den Lehrkräften eingereichten Arbeitsprodukte weisen spezifische Fortbildungseffekte auf.
Strong, anisotropic anomalous Hall effect and spin Hall effect in chiral antiferromagnetic compounds Mn$_3X$ ($X$ = Ge, Sn, Ga, Ir, Rh and Pt)
Creators: name: Zhang, Yang
name: Sun, Yan
name: Yang, Hao
name: Železný, Jakub
name: Parkin, Stuart P. P.
name: Felser, Claudia
name: Yan, Binghai
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We have carried out a comprehensive study of the intrinsic anomalous Hall effect and spin Hall effect of several chiral antiferromagnetic compounds, Mn$_3X$ ($X$ = Ge, Sn, Ga, Ir, Rh and Pt) by $ab~initio$ band structure and Berry phase calculations. These studies reveal large and anisotropic values of both the intrinsic anomalous Hall effect and spin Hall effect. The Mn$_3X$ materials exhibit a non-collinear antiferromagnetic order which, to avoid geometrical frustration, forms planes of Mn moments that are arranged in a Kagome-type lattice. With respect to these Kagome planes, we find that both the anomalous Hall conductivity (AHC) and the spin Hall conductivity (SHC) are quite anisotropic for any of these materials. Based on our calculations, we propose how to maximize AHC and SHC for different materials. The band structures and corresponding electron filling, that we show are essential to determine the AHC and SHC, are compared for these different compounds. We point out that Mn$_3$Ga shows a large SHC of about 600 $(\hbar/e)(Ω\cdot cm)^{-1}$. Our work provides insights into the realization of strong anomalous Hall effects and spin Hall effects in chiral antiferromagetic materials.
description: 10 pages, 8 figures and 4 tables
Law as a Social Medicine: a case of Law Abuse, Addiction and Overdose in Nigeria
Creators: name: Agbede, Ooreoluwa
Publisher: name: figshare
Year: 2022
Subjects: subject: 180122 Legal Theory, Jurisprudence and Legal Interpretation
subject: FOS: Law

description: Discussions of the utility of the laws in Nigeria are not novel amongst scholars, lawyers, law students, and political scientists in Nigeria. Laws are generally agreed to serve multifarious purposes including goals parallel to medicine in man. The way Medicine has functions which vary from preventive, curative, and rehabilitative, so also can a law be to prevent, cure and rehabilitate a sick society. These different health care functions can be discussed withthe curative function of law thus: What should be the course when the medicine is the cause of the sickness?or when the sickness is due to overdose of drugs, or drug abuse? The writer explains the illnessof Nigeria from the perspective of the sociological jurisprudence, concluding that not just any law is sufficient as a medicine but a carefully prescribed law, the same way prescription has to be done by an expert for the drug to function maximally in the human body, noting that in reality, the law can either act to cure, prevent and rehabilitate the society of social ills or destroy, exacerbate and permit societal ills.
The Mid-Infrared Luminosity Evolution and Luminosity Function of Quasars with SDSS and WISE
Creators: name: Singal, J.
name: George, J.
name: Gerber, A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We determine the 22$μ$m luminosity evolution and luminosity function for quasars from a data set of over 20,000 objects obtained by combining flux-limited Sloan Digital Sky Survey optical and Wide field Infrared Survey Explorer mid-infrared data. We apply methods developed in previous works to access the intrinsic population distributions non-parametrically, taking into account the truncations and correlations inherent in the data. We find that the population of quasars exhibits positive luminosity evolution with redshift in the mid-infrared, but with considerably less mid-infrared evolution than in the optical or radio bands. With the luminosity evolutions accounted for, we determine the density evolution and local mid-infrared luminosity function. The latter displays a sharp flattening at local luminosities below $\sim 10^{31}$ erg sec$^{-1}$ Hz$^{-1}$, which has been reported previously at 15 $μ$m for AGN classified as both type-1 and type-2. We calculate the integrated total emission from quasars at 22 $μ$m and find it to be a small fraction of both the cosmic infrared background light and the integrated emission from all sources at this wavelength.
description: 13 pages, 11 figures, published in ApJ. arXiv admin note: text overlap with arXiv:1207.3396
Differential infrared thermography for rotor aerodynamics
Creators: name: Wolf, Claus Christian
Publisher: name: Hannover : Institutionelles Repositorium der Leibniz Universität Hannover
Year: 2023
Subjects: subject: Aerodynamics
subject: Helicopter
subject: Boundary Layer Transition
subject: Rotors
subject: Infrared Thermography
subject: Aerodynamik
subject: Hubschrauber
subject: Grenzschichttransition
subject: Rotoren
subject: Infrarotthermographie
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau::629 | Andere Fachrichtungen der Ingenieurwissenschaften

description: Understanding the flow around helicopter rotors is one of the greatest challenges in modern aerodynamics. The flow field plays a key role in the rotorcraft performance and operational safety, and it is characterized by highly unsteady and three-dimensional phenomena. State-of-the-art computational fluid dynamics (CFD) is applied during the design of future rotorcraft and offers remarkable capabilities, including the simulation of entire helicopter configurations in maneuvering flight. Nevertheless, experiments are still essential for the understanding of complex flow regimes, and for the validation of numerical results. An ever-increasing level of detail in CFD studies motivates the development and refinement of experimental methods, and combined experimental-numerical efforts have been particularly rewarding in recent studies. Starting with early rotorcraft-specific research topics, for example the systematic characterization of pitch-oscillating airfoils in the 1960s, experimental techniques have undergone continuous improvement. This particularly holds true for optical methods, which have developed from providing qualitative and “simple” snapshots of the flow into quantitative and time-resolving diagnostic tools. Optical methods require few modifications of the rotor or rotorcraft under investigation. They are particularly suitable for an application on multiple scales, ranging from small-scale laboratory studies to full-scale free-flying helicopters. This thesis concentrates on the development, validation, and application of the differential infrared thermography (DIT). The DIT method is able to determine the moving position of the laminar-turbulent boundary layer transition, which is a relevant aerodynamic feature on rotor blades, accounting for the unsteadiness introduced by the different inflow conditions on the advancing and retreating sides of the trimmed rotor plane in forward flight. Additional helicopter-relevant applications include the study of pitch-oscillating airfoils or small-scaled rotors in laboratory or wind-tunnel environments. Furthermore, it will be shown that the DIT principle can be adapted to other rotor-relevant topics beyond transition research, such as dynamic stall investigations. DIT is a valuable addition to the larger family of optical measurement techniques for aerodynamic applications.
title: Vom Modell zum Algorithmus
title: Kombinatorische Optimierung im Mathematikunterricht
titleType: AlternativeTitle
Creators: name: Fest, Andreas
Publisher: name: Gesellschaft für Didaktik der Mathematik
Year: 2007
Subjects: subject: 510

description: Fragestellungen aus der Kombinatorischen Optimierung, die mit Hilfe von Graphenalgorithmen gelöst werden können, begegnen uns in verschiedenen Alltagssituationen. Beispiele aus der Optimierung von Bahnnetzen oder der Routenplanung in Straßennetzen sind dabei auch für Schülerinnen und Schüler greifbar und eigenen sich somit hervorragend, um Probleme der Diskreten Mathematik im Schulunterricht zu behandeln. Wir wollen die Lernsoftware Visage vorstellen, mit deren Hilfe solche Themen im Mathematikunterricht der Sekundarstufen umgesetzt werden können.
Square Series Generating Function Transformations
Creators: name: Schmidt, Maxie D.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 05A15, 44A99, 33E99, 11B73

description: We construct new integral representations for transformations of the ordinary generating function for a sequence, $\langle f_n \rangle$, into the form of a generating function that enumerates the corresponding "square series" generating function for the sequence, $\langle q^{n^2} f_n \rangle$, at an initially fixed non-zero $q \in \mathbb{C}$. The new results proved in the article are given by integral-based transformations of ordinary generating function series expanded in terms of the Stirling numbers of the second kind. We then employ known integral representations for the gamma and double factorial functions in the construction of these square series transformation integrals. The results proved in the article lead to new applications and integral representations for special function series, sequence generating functions, and other related applications. A summary Mathematica notebook providing derivations of key results and applications to specific series is provided online as a supplemental reference to readers.
description: Keywords: Square series, generating function, series transformation, integral transformation, gamma function, double factorial, Stirling number of the second kind, Jacobi theta function, Ramanujan theta function
Bürkle, Horst, Der Mensch auf der Suche nach Gott - die Frage der Religonen
Creators: name: Scheffczyk, Leo
Publisher: name: Forum Katholische Theologie
Year: 1970

description: Forum Katholische Theologie, Bd. 13 Nr. 4 (1997): Forum Katholische Theologie, Band 13, Heft 4
Labour and internment camps in the Victorian forests 1930-1945
Creators: name: Bridger, Eleanor.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
VCIOM-SPUTNIK Poll: August 2023
Creators: name: VCIOM (Russian Public Opinion Research Center)
Publisher: name: Roper Center for Public Opinion Research
Year: 2023

description: President of Russia approval (1); Prime Minister approval (1); State Duma of Russia (2); political party preference (2); mass protests (2); Internet usage (1); watch TV (1); trade unions (1); judicial system (1); Russian Orthodox church (1); personal financial situation (2); employment (2); sources of income (1); most important problems (5); rise in prices, inflation (2); Russian ruble and US dollar exchange rate fluctuations (3); unemployment (2); take out loans (2); spend or save money (1); savings (1); economic policy (1); social policy (1); foreign policy (1); direction of country (1); life satisfaction (2).
Features of collisionless turbulence in the intracluster medium from simulated Faraday rotation maps II: the effects of instabilities feedback
Creators: name: Santos-Lima, R.
name: Pino, E. M. de Gouveia Dal
name: Falceta-Gonçalves, D. A.
name: Nakwacki, M. S.
name: Kowal, G.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Fluid Dynamics (physics.flu-dyn)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Statistical analysis of Faraday Rotation Measure (RM) maps of the intracluster medium (ICM) of galaxy clusters provides a unique tool to evaluate some spatial features of the magnetic fields there. Its combination with numerical simulations of magnetohydrodynamic (MHD) turbulence allows the diagnosis of the ICM turbulence. Being the ICM plasma weakly collisional, the thermal velocity distribution of the particles naturally develops anisotropies as a consequence of the large scale motions and the conservation of the magnetic moment of the charged particles. A previous study (Paper I) analyzed the impact of large scale thermal anisotropy on the statistics of RM maps synthesized from simulations of turbulence; these simulations employed a collisionless MHD model which considered a tensor pressure with uniform anisotropy. In the present work, we extend that analysis to a collisionless MHD model in which the thermal anisotropy develops according to the conservation of the magnetic moment of the thermal particles. We also consider the effect of anisotropy relaxation caused by the micro-scale mirror and firehose instabilities. We show that if the relaxation rate is fast enough to keep the anisotropy limited by the threshold values of the instabilities, the dispersion and power spectrum of the RM maps are indistinguishable from those obtained from collisional MHD. Otherwise, there is a reduction in the dispersion and steepening of the power spectrum of the RM maps (compared to the collisional case). Considering the first scenario, the use of collisional MHD simulations for modeling the RM statistics in the ICM becomes better justified.
description: 7 pages, 4 figures, accepted for publication on MNRAS
May, Georg, Ego N. N. Catholiccie Ecclesiae Episcopus - Entstehung, Entwicklung und Bedeutung einer Unterschriftsformel im Hinblick auf den Universalepiskopat des Papstes
Creators: name: Cattaneo, Arturo
Publisher: name: Forum Katholische Theologie
Year: 1970

description: Forum Katholische Theologie, Bd. 13 Nr. 4 (1997): Forum Katholische Theologie, Band 13, Heft 4