cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Uncovering multiple Wolf-Rayet star-clusters and the ionized ISM in Mrk178: the closest metal-poor Wolf-Rayet HII galaxy
Creators: name: Kehrig, C.
name: Perez-Montero, E.
name: Vilchez, J. M.
name: Brinchmann, J.
name: Kunth, D.
name: Garcia-Benito, R.
name: Crowther, P. A.
name: Hernandez-Fernandez, J.
name: Durret, F.
name: Contini, T.
name: Fernandez-Martin, A.
name: James, B. L.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: New integral field spectroscopy (IFS) has been obtained for the nearby metal-poor WR galaxy Mrk178 to examine the spatial correlation between its WR stars and the neighbouring ionized ISM. The strength of the broad WR features and its low metallicity make Mrk178 an intriguing object. We have detected the blue and red WR bumps in different locations across the FOV (~ 300 pc x 230 pc) in Mrk178. The study of the WR content has been extended, for the first time, beyond its brightest star-forming knot uncovering new WR star-clusters. Using SMC/LMC-template WR stars we empirically estimate a minimum of ~ 20 WR stars within the region sampled. Maps of the spatial distribution of the emission-lines and of the physical-chemical properties of the ionized ISM have been created and analyzed. Here we refine the statistical methodology by Perez-Montero et al.(2011) to probe the presence of variations in the ISM properties. An error-weighted mean of 12+log(O/H)=7.72 +/- 0.01 is taken as the representative oxygen abundance for Mrk178. A localized N and He enrichment, spatially correlated with WR stars, is suggested by this analysis. Nebular HeII4686 emission is shown to be spatially extended reaching well beyond the location of the WR stars. This spatial offset between WRs and HeII emission can be explained based on the mechanical energy input into the ISM by the WR star winds, and does not rule out WR stars as the HeII ionization source. We study systematic aperture effects on the detection and measurement of the WR features, using SDSS spectra combined with the power of IFS. In this regard, the importance of targeting low metallicity nearby systems is discussed.
description: Accepted for publication in MNRAS, 15 pages, 11 figures, 3 tables
title: Vibrant Wreckage: Salvation and New Materialism in Moby-Dick and Ambient Parking Lot
Creators: name: Enggass, Dale
Publisher: name: Electronic Book Review
Year: 2018

description: Instead of simply reviewing Vibrant Matter by Jane Bennett (Duke 2010), author Dale Enggass applies Bennett's "Political Ecology of Things" to longstanding (and not yet resolved) themes of salvation, materialism and transcendence in Melville's Moby-Dick and Pamela Lu's Ambient Parking Lot.
title: Parasite of a Parasite
Creators: name: JOHNSTON, David Jhave
name: Braune, Sean
Publisher: name: Electronic Book Review
Year: 2018

description: For a journal like ebr, long devoted to peer-to-peer reviews (of writers for and by writers), the engagement by Jhave with Sean Braune's Language Parasites suggests a variation on that model. Their parasite-to-parasite encounter bodes well to supplement (if not overtake) the hidden, professionalized peer review models that keeps all of us so busy and so hidden from view - of one another, not to mention our potential audiences. What better outcome for born digital scholarship than the replacement of "double blind" peer review with a "phorontology" of ties that bind, "[extending] its embrace to all"?
Electromagnetic levitation guide for use in ultra-precision milling centres
Creators: name: Denkena, Berend
name: Dahlmann, Dominik
name: Krueger, R.
Publisher: name: Amsterdam : Elsevier
Year: 2015
Subjects: subject: machine tool
subject: ultra-precision machining
subject: Electromagnetic propulsion
subject: Levitation melting
subject: Life cycle
subject: Milling (machining)
subject: Precision engineering
subject: Productivity
subject: Cutting parameters
subject: Deterministic methods
subject: Electromagnetic levitation
subject: Engineering process
subject: Magnetic guide
subject: Precision machines
subject: Ultra precision millings
subject: Ultraprecision machining
subject: Machine tools
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: Today's machine tools for ultra-precision machining are generally characterised by low productivity. Above all, practical cutting parameters are limited due to uncontrollable disturbance forces. Therefore, it is necessary to pursue the qualification of new technologies to overcome current limitations in productivity. In this paper, an approach for the design of a novel electromagnetic levitation guide for use in ultra-precision milling centres is presented. Design and arrangement of the magnetic guide's components are considered with regard to requirements and design principles of precision machines. Deterministic methods are utilised throughout the engineering process to ensure high stiffness and high dynamics. As a result, a concept for the electromagnetic ultra-precision linear guide is derived.
Planar functions and perfect nonlinear monomials over finite fields
Creators: name: Zieve, Michael
Publisher: name: arXiv
Year: 2013
Subjects: subject: Combinatorics (math.CO)
subject: Information Theory (cs.IT)
subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: 51E20, 11T06, 11T71, 05B05

description: The study of finite projective planes involves planar functions, namely, functions f : F_q --> F_q such that, for each nonzero a in F_q, the function c --> f(c+a) - f(c) is a bijection on F_q. Planar functions are also used in the construction of DES-like cryptosystems, where they are called perfect nonlinear functions. We determine all planar functions on F_q of the form c --> c^t, under the assumption that q >= (t-1)^4. This implies two conjectures of Hernando, McGuire and Monserrat. Our arguments also yield a new proof of a conjecture of Segre and Bartocci from 1971 about monomial hyperovals in finite Desarguesian projective planes.
description: 10 pages
Editionsvergleich Themistoklesvita
Creators: name: Lang, Catherine
Publisher: name: Working Papers Contested Order/ eAQUA Working Papers
Year: 2014

description: Working Papers Contested Order/ eAQUA Working Papers, Bd. 7 (2012): Working Papers Contested Order: Das Portal eAQUA – Neue Methoden in der geisteswissenschaftlichen Forschung III
Single point potentials with total resonant tunneling
Creators: name: Zolotaryuk, A. V.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Two rectangular models described by the one-dimensional Schroedinger equation with sharply localized potentials are suggested. The potentials have a multi-layer thin structure being composed from adjacent barriers and wells. Their peculiar tunneling properties are studied in considerable detail. Particularly, in the zero-range limit when the potentials are squeezed to a single point, sharp peaks with total transmission are observed at certain (positive and negative) quantized values of the potential strength constant forming infinite discrete sets. Beyond these sets, the barrier-well structures behave as a perfectly reflecting wall. The transcendental equations with respect to potential strengths, the solutions of which determine transmission (resonance) sets, are derived. In this regard, both the models are exactly solvable. The energy dependence of an incident particle is shown to reveal a resonance behavior, being completely different from that observed in a typical double barrier structure.
description: 8 figures
Flexible Magnetic Reading/Writing System: Heat-assisted Magnetic Recording
Creators: name: Taptimthong, Piriya
name: Düsing, Jan Friedrich
name: Rissing, Lutz
name: Wurz, Marc Christopher
Publisher: name: Amsterdam : Elsevier
Year: 2016
Subjects: subject: Heat-assisted magnetic recording (HAMR)
subject: flexible substrate
subject: magnetic write head
subject: inherent magnetic data storage
subject: Industry 4.0
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik

description: Data storage is one of indispensable technical assets defined in a frame work of Industry 4.0. Among many data storage technologies, inherent magnetic data storage on surfaces of technical components is promising, especially when the components are employed in harsh environments. Comparing with other storage technologies like labels, RFID tags and engraving, the inherent magnetic storage is rewritable and resistant to weathering. High temperature and a high magnetic field, however, can degrade or even delete magnetically stored data. This limitation can be coped with using a medium with higher coercivity that can withstand external magnetic fields and high temperature. As a consequence of higher coercivity, a higher write field is required to magnetize the medium. A design of a flexible write head that is suitable for storage applications on surfaces of technical components, is restricted by head-medium interface criterions, and hence field strength generated from the write head cannot be arbitrary large. To solve this problem, a heat-assisted magnetic recording (HAMR) is proposed as a means to temporarily reduce coercivity of a medium during writing. A realization of a HAMR module and an experiment as well as its positive results are presented in this work.
Editionsvergleich Aristeidesvita
Creators: name: Straßburger, Kevin
Publisher: name: Working Papers Contested Order/ eAQUA Working Papers
Year: 2014

description: Working Papers Contested Order/ eAQUA Working Papers, Bd. 7 (2012): Working Papers Contested Order: Das Portal eAQUA – Neue Methoden in der geisteswissenschaftlichen Forschung III
A Twist-Bend Chiral Helix of 8nm Pitch in a Nematic Liquid Crystal of Achiral Molecular Dimers
Creators: name: Chen, Dong
name: Porada, Jan H.
name: Hooper, Justin B.
name: Klittnick, Arthur
name: Shen, Yongqiang
name: Korblova, Eva
name: Bedrov, Dmitry
name: Walba, David M.
name: Glaser, Matthew A.
name: Maclennan, Joseph E.
name: Clark, Noel A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Freeze Fracture Transmission Electron Microscopy (FFTEM) study of the nanoscale structure of the so-called "twist-bend" nematic (NX) phase of the cyanobiphenyl (CB) dimer molecule CB(CH2)7CB reveals a stripe texture of fluid layers periodically arrayed with a bulk spacing of d ~ 8.3 nm. Fluidity and a rigorously maintained spacing produce long-range-ordered fluid layered focal conic domains. Absence of a lamellar x-ray reflection at wavevector q ~ 2π/8 nm-1 or its harmonics in synchrotron-based scattering experiments indicates that this periodic structure is achieved with no detectable associated modulation of the electron density, and thus has nematic molecular ordering. A search for periodic ordering with d ~ 8nm in CB(CH2)7CB using atomistic molecular dynamic computer simulation yielded equilibration of a conical twist-bend helixed nematic ground state, of the sort first proposed by Meyer, and envisioned in systems of bent molecules by Dozov and Memmer, We identify θ ~ 33 degree as the cone angle, and p ~ 8nm as the full pitch of the helix, the shortest ever found in a nematic fluid.
description: 21 pages, 6 figures
Investigation of the skive hobbing process by applying a dexel-based cutting simulation
Creators: name: Böß, Volker
name: Denkena, Berend
name: Henning, S.
Publisher: name: Amsterdam : Elsevier
Year: 2015
Subjects: subject: cutting simulation
subject: dexel-based approach
subject: skive hobbing
subject: Life cycle
subject: Machining
subject: Analytical description
subject: Cartesian coordinate
subject: Cutting simulation
subject: Hobbing
subject: Position dependents
subject: Process Modeling
subject: Undeformed chip thickness
subject: Gears
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik

description: In this paper, a novel approach for cutting simulation of skive hobbing is presented. Skive hobbing is a process applied for finishing of already hardened gears. The process is characterized by varying tool engagements and very small chip thicknesses. The paper describes the process-modeling and the analysis of the workpiece-tool contact. For efficient modeling, a novel dexel-based method is presented for the description of a gear segment with discretized stock allowance. Characteristic of the method is an analytical description of the target workpiece contour which allows to describe points of the surface by Cartesian coordinates on the winding off. Dexel are oriented orthogonal to the surface of the final workpiece contour. The initial lengths of the dexel describe the stock allowance. By cutting these dexel with a tool, a time- and position-dependent prediction of material removal values, e.g. width of undeformed chip or undeformed chip thickness, is possible. Selected results are presented and interpreted.
Overscreened Kondo fixed point in S=1 spin liquid
Creators: name: Serbyn, Maksym
name: Senthil, T.
name: Lee, Patrick A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We propose a possible realization of the overscreened Kondo impurity problem by a magnetic s=1/2 impurity embedded in a two-dimensional S=1 U(1) spin liquid with a Fermi surface. This problem contains an interesting interplay between non-Fermi-liquid behavior induced by a U(1) gauge field coupled to fermions and a non-Fermi-liquid fixed point in the overscreened Kondo problem. Using a large-N expansion together with an expansion in the dynamical exponent of the gauge field, we find that the coupling to the gauge field leads to weak but observable changes in the physical properties of the system at the overscreened Kondo fixed point. We discuss the extrapolation of this result to a physical case and argue that the realization of overscreened Kondo physics could lead to observations of effects due to gauge fields.
description: 10 pages, 5 figures
Virtual reality use and patient outcomes in palliative care: A scoping review
Creators: name: MOLONEY, MAIREAD
name: DOODY, OWEN
name: O’Reilly, Martina
name: Lucey, Michael
name: Callinan, Joanne
name: Exton, Chris
name: Colreavy-Donnelly, Simon
name: O’Mahony, Frances
name: MESKELL, PAULINE
name: COFFEY, ALICE
Publisher: name: University of Limerick
Year: 2023
Subjects: classificationCode: 42
subject: Health sciences
subject: FOS: Health sciences
classificationCode: 46
subject: Information and computing sciences

description: Objective: Virtual reality is increasingly used in healthcare settings. Potentially, it’s use in palliative care could have a positive impact; however, there is limited evidence on the scope, purpose and patient outcomes relating to virtual reality use in this context. The objective of this scoping review is to chart the literature on virtual reality use in palliative care, identifying any evidence relating to biopsychosocial patient outcomes which could support its use in practice. Methods: A scoping review of the literature, involving . a systematic search across 10 electronic bibliographic databases in December 2021, . Eligibility criteria were primary research studies, of any research design within a 10-year timeframe, which reported on virtual reality use and patient outcomes in palliative care. A total of 993 papers were identified, and comprehensive screening resulted in 10 papers for inclusion. Results: This scoping review identified 10 papers addressing virtual reality in palliative care, published within a three-year timeframe 2019–2021. Research methodologies included mixed methods, quantitative and qualitative. The evidence high-lights virtual reality use with patients receiving palliative care in a variety of settings, and data around use ability, feasibility and acceptability is positive. However, the evidence regarding biopsychosocial patient outcomes linked to virtual reality use is limited. Conclusion: Virtual reality is gathering momentum in palliative care and is potentially a helpful intervention; however more research is needed to underpin the evidence base supporting its application, particularly in understanding the impact on biopsychosocial patient outcomes and ascertaining the best approach for measuring intervention effectiveness.
Time dependent Stark ladders: Exact propagator and caustic control
Creators: name: Sadurni, Emerson
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: Other Condensed Matter (cond-mat.other)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: In this note we present a new propagator for a particle in discrete space under the influence of a time-dependent field. With this result we are able to control the shape of caustics emerging from a point-like source, as the explicit form of the wavefronts can be put in terms of the external field.
description: 11 pages, 2 figures
Holistic approach of lean thinking in learning factories
Creators: name: Goerke, Matthias
name: Schmidt, Maurice
name: Busch, Jan
name: Nyhuis, Peter
Publisher: name: Amsterdam : Elsevier
Year: 2015
Subjects: subject: Holistic approach
subject: Lean administration
subject: Lean production
subject: Learning factory
subject: Economics
subject: Productivity
subject: Administrative process
subject: Institute of production systems and logistics
subject: Integral optimization
subject: Organizational structures
subject: Production environments
subject: Productivity improvements
subject: Konferenzschrift
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie::330 | Wirtschaft

description: Simulation games that employ the "learning by doing" approach are used to transfer complex knowledge from the most diverse fields of economy. Their popularity steadily continues to grow in the framework of seminars and workshops. The Institute of Production Systems and Logistics (IFA) applies this style of haptic learning in order to teach Lean Management contents to students as well as industry specialists and executives. During the interactive training sessions participants are involved in realistic operating situations including actual assembly processes and learn practically relevant research contents. This paper presents a training concept offered within the "IFA Lernfabrik" that incorporates the philosophy and application of Lean Thinking. Particular attention is given to the simultaneous consideration of production and administration. This synchronized approach is based on the fact that presently the administration side offers very high productivity potentials, while the vast majority of improvement activities is performed in production. To provide a better understanding for this approach, an interactive two-stage training environment was designed to highlight the advantages of Lean Production and Lean Administration methods. The first stage challenges the participants with a situation that is characterized by an inefficient production environment and limited administrative features. The aim is to improve the current situation through the utilization of the lean methods learned during the first stage training session. Within the second stage, the administrative features are being extended, which initially still exhibit wasteful characteristics. It becomes obvious that the advantages of an optimized production are not fully realized due to inefficient administrative processes. This clarifies the principle that productivity improvement activities should always entail an integral optimization of business processes. Therefore, the participants subsequently learn how to transfer and apply the methods of Lean Production in administration as tools to not only optimize their production but the entire organizational structure.
A beyond-mean-field example with zero-range effective interactions in infinite nuclear matter
Creators: name: Moghrabi, K.
name: Grasso, M.
name: Roca-Maza, X.
name: Coló, G.
name: Van Giai, N.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Zero-range effective interactions are commonly used in nuclear physics to describe a many-body system in the mean-field framework. If they are employed in beyond- mean-field models, an artificial ultraviolet divergence is generated by the zero-range of the interaction. We analyze this problem in symmetric nuclear matter with the t0-t3 Skyrme model. In this case, the second-order energy correction diverges linearly with the momentum cutoff. After that, we extend the work to the case of nuclear matter with the full Skyrme interaction. A strong divergence related to the velocity-dependent terms of the interaction is obtained. Moreover, a global fit can be simultaneously performed for both symmetric and nuclear matter with different neutron-to-proton ratios. These results pave the way for applications to finite nuclei in the framework of beyond mean-field theories.
description: 7 pages, 5 figures, NSRT12-International Conference on Nuclear Structure and Related Topics
Evolution of M82-like starburst winds revisited: 3D radiative cooling hydrodynamical simulations
Creators: name: Melioli, C.
name: Pino, E. M. de Gouveia Dal
name: Geraissate, F.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: In this study we present three-dimensional radiative cooling hydrodynamical simulations of galactic winds generated particularly in M82-like starburst galaxies. We have considered intermittent winds induced by SNe explosions within super star clusters randomly distributed in the central region of the galaxy and were able to reproduce the observed M82 wind conditions with its complex morphological outflow structure. We have found that the environmental conditions in the disk in nearly recent past are crucial to determine whether the wind will develop a large scale rich filamentary structure, as in M82 wind, or not. Also, the numerical evolution of the SN ejecta have allowed us to obtain the abundance distribution over the first 3 kpc extension of the wind and we have found that the SNe explosions change significantly the metallicity only of the hot, low-density wind component. Moreover, we have found that the SN-driven wind transports to outside the disk large amounts of energy, momentum and gas, but the more massive high-density component reaches only intermediate altitudes smaller than 1.5 kpc. Therefore, no significant amounts of gas mass are lost to the IGM and the mass evolution of the galaxy is not much affected by the starburst events occurring in the nuclear region.
description: Accepted by MNRAS, 16 pages, 14 figures
Prediction of temperature induced shape deviations in dry milling
Creators: name: Denkena, Berend
name: Schmidt, A.
name: Maaß, P.
name: Niederwestberg, D.
name: Niebuhr, C.
name: Vehmeyer, J.
Publisher: name: Amsterdam : Elsevier
Year: 2015
Subjects: subject: Deformation
subject: Dry milling
subject: Finite element method (FEM)
subject: Forecasting
subject: Heat flux
subject: Machining centers
subject: Milling (machining)
subject: Geometric modelling
subject: Material removal
subject: Simulation
subject: Thermal error
subject: Finite element method
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik

description: In this paper a model for a simulation based prediction of temperature induced shape deviations in dry milling is presented. A closed loop between Boolean material removal, process forces, heat flux and thermoelastic deformation is established. Therefore, an efficient dexel based machining simulation is extended by a contact zone analysis to model the local workpiece load. Based on the computed contact zone the cutting forces and heat flux are calculated using a semi-empirical process model. For a detailed consideration of the loads they are discretized and localized on the dexel-represented workpiece surface. A projection of the localized workpiece loads on the boundary of the finite element domain, taking into account the Boolean material removal during the process, allows the calculation of the current temperature and deformation of the workpiece. By transforming these thermomechanical characteristics back to the dexel-model a consideration in the machining simulation is possible. An extended contact zone analysis is developed for the prediction of the localized shape deviations. Finally, the results of the simulation are compared with measured data. The comparison shows that workpiece temperatures, workpiece deformation and shape deviations in different workpiece areas are predicted accurately.
Prediction of the 3D surface topography after ball end milling and its influence on aerodynamics
Creators: name: Denkena, Berend
name: Böß, Volker
name: Nespor, D.
name: Gilge, P.
name: Hohenstein, S.
name: Seume, Jörg R.
Publisher: name: Amsterdam : Elsevier
Year: 2015
Subjects: subject: Milling
subject: Simulation
subject: Topography
subject: Ball milling
subject: Forecasting
subject: Kinematics
subject: Machining centers
subject: Milling (machining)
subject: Stochastic systems
subject: Turbomachine blades
subject: 3-D surface topography
subject: Ball end mill
subject: Ball end milling
subject: Empirical data
subject: Machining Process
subject: Machining simulation
subject: Surface prediction
subject: Surface topography
subject: Konferenzschrift
subject: Dewey Decimal Classification::500 | Naturwissenschaften

description: The surface topography of milled workpieces often defines their performance. One example is blades in turbine engines, where the topography defines the flow losses. This type of complex goods is often machined by ball end mills, either for manufacture or repair. The literature offers various model types to predict the surface topography in order to design a machining process without prior experiment. The most accurate models use the real kinematics of the process and blend the tool with the workpiece. But this type of surface prediction ignores the differences between the reality and the simulation due to vibrations, tool chipping etc. This paper presents a combined approach using the kinematic topography from the machining simulation and adds a stochastic topography based on empirical data. It could be shown, that the usage of the stochastic topography greatly affects the flow losses and thus cannot be ignored.
Equisetum arvense L.
Creators: name: Becherer
Publisher: name: Zenodo
Year: 1956
Subjects: Biodiversity
Taxonomy

description: L. arvense L. Cat. 236. Bis in die obersten Roggenfelder bei Findelen ob Zermatt: 2120m (Braun-Blanquet 1919,Thellung 1919),ebenda etwa2100m (Becherer und Berset1945). Var.coerulescens DC. (var. coeruleum Cosson et Germain) - 2: Zwischen Niedergampel und Bratsch (Hirschmann 1951). - 3: Heiklen ob Zeneggen (Stehler, Frl. M. Bergmann, Hirschmann); Stalden-Kalpetran (Huber); Zermatt (Beauverd, Becherer, Schatzmann). _ 4:Zwischen Z'Matt und Mörel (Becherer und Zwicky).
description: Published as part of Becherer, 1956, Florae Vallesiacae Supplementum, pp. 1-556 in Denkschriften der Schweizerischen Naturforschenden Gesellschaft 71 on pages 1-556
Enabling an Industrial Robot for Metal Cutting Operations
Creators: name: Denkena, Berend
name: Lepper, Thomas
Publisher: name: Amsterdam : Elsevier
Year: 2015
Subjects: subject: compensation
subject: force measurement
subject: machining robot
subject: process monitoring
subject: Aerospace industry
subject: Compensation (personnel)
subject: Cost effectiveness
subject: Cutting
subject: Force measurement
subject: Industrial robots
subject: Process monitoring
subject: Robots
subject: Cost effective
subject: Cutting forces
subject: Cutting operations
subject: Machining robot
subject: Measurement device
subject: Positioning error
subject: Static deflections
subject: Tool deflection
subject: Metal cutting
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie::330 | Wirtschaft

description: This paper focuses on a cost-effective manufacturing of large frame parts for aerospace industries with an industrial robot. The main challenge is the low stiffness of a serial kinematic, resulting in positioning errors due to gravity and cutting forces. Therefore, an approach is presented to optimize positioning of a robot by compensation of tool deflection. A static deflection model of the robot is built up to calculate the deflection caused by forces acting on the spindle. To detect these forces a suitable measurement device is presented. This sensing spindle holder is calibrated to detect cutting forces.
Finding a way to determine the pion distribution amplitude from the experimental data
Creators: name: Huang, Tao
name: Wu, Xing-Gang
name: Zhong, Tao
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: It is believed that one can extract more accurate information of the pion distribution amplitude from the pion-photon transition form factor (TFF) due to the single pion in this process. However the BABAR and Belle data of the pion-photon TFF have a big difference for $Q^2\in [15,40]$ GeV$^2$, and at present, the pion DA can not be definitely determined from the pion-photon TFF. it is crucial to find the right pion DA behavior and to determine which data is more reliable. In this letter, we perform a combined analysis of the most existing data of the processes involving pion by using a general model for the pion wavefunction/DA. Such a DA model can mimic all the existed pion DA behaviors, whose parameters can be fixed by the constraints from the processes $π^0\toγγ$, $π\toμν$, $B\toπl ν$, and etc. Especially, we examine the $B \rightarrow π$ transition form factors that provides another constraint to the parameter $B$ in our DA model, which results in $B \in[0.00,0.29]$. This inversely shows that the predicted curve for the pion-photon TFF is between the BABAR and Belle data in the region $Q^2\in$ $[15,40]$ GeV$^2$. It will be tested by coming more accurate data at large $Q^2$ region, and the definite behavior of pion DA can be concluded finally.
description: 4 pages, 2 figures. To match the published version. To be published in Chin.Phys.Lett. (Express Letter)
Growth curve based on scale mixtures of skew-normal distributions to model the age-length relationship of Cardinalfish (Epigonus Crassicaudus)
Creators: name: Contreras-Reyes, Javier E.
name: Arellano-Valle, Reinaldo B.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: Our article presents a robust and flexible statistical modeling for the growth curve associated to the age-length relationship of Cardinalfish (Epigonus Crassicaudus). Specifically, we consider a non-linear regression model, in which the error distribution allows heteroscedasticity and belongs to the family of scale mixture of the skewnormal (SMSN) distributions, thus eliminating the need to transform the dependent variable into many data sets. The SMSN is a tractable and flexible class of asymmetric heavy-tailed distributions that are useful for robust inference when the normality assumption for error distribution is questionable. Two well-known important members of this class are the proper skew-normal and skew-t distributions. In this work emphasis is given to the skew-t model. However, the proposed methodology can be adapted for each of the SMSN models with some basic changes. The present work is motivated by previous analysis about of Cardinalfish age, in which a maximum age of 15 years has been determined. Therefore, in this study we carry out the mentioned methodology over a data set that include a long-range of ages based on an otolith sample where the determined longevity is higher than 54 years.
description: 16 pages, 6 figures
title: Decollage of an Iconic Image
Creators: name: Schulz, Daniel
Publisher: name: Electronic Book Review
Year: 2018

description: Even as the first biography of Kathy Acker appears, we have word of a newly assembled Acker archive in Cologne, under the curatorship of Daniel Schulz. The gist of which, could be to re-orient Acker's personal relationships to "the politics inherent in Acker's life."
Fluiddynamic planar drive with unrestrained rotational degree of freedom
Creators: name: Denkena, Berend
name: Dahlmann, Dominik
name: Schumacher, T.
Publisher: name: Amsterdam : Elsevier
Year: 2015
Subjects: subject: Desktop machine
subject: Bearings (machine parts)
subject: Fluid dynamics
subject: Gas dynamics
subject: Life cycle
subject: Machine components
subject: Machine tools
subject: Nozzle design
subject: Precision engineering
subject: Shafts (machine components)
subject: Aerostatic bearings
subject: Direct drive
subject: Drive systems
subject: Geometrical constraints
subject: Pre-stressed
subject: Rotational degree of freedom
subject: Technical implementation
subject: Thrust forces
subject: Degrees of freedom (mechanics)
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: In this paper, a new planar drive system for the use in small machine tools is introduced. It is based on an innovative fluid dynamic drive principle, which generates thrust forces by the deflection of fluid jets on flow grids integrated into the slide. In addition to the translational movements in x- and y-direction, this drive allows unlimited rotation around the z-axis in any position. Advantages are the reduced number of necessary machine components and a frictionless movement by magnetically pre-stressed, aerostatic bearing. The working principle of the drive is explained and its geometrical constraints are investigated. The arrangement of the nozzles and the design of the grid profiles are optimized. Finally, the technical implementation of the drive is presented.
Liebe und Hass. Magnetes Geheimnis
Creators: name: Klingeler, Rüdiger
Publisher: name: Ruperto Carola
Year: 2016

description: Anziehung und Abstoßung gehören zu den grundlegenden Eigenschaften von Magneten. Sie sind ein Grund dafür, dass magnetische Materialien in zahlreichen technischen Anwendungen zum Einsatz kommen – von Elektromotoren über bildgebende Verfahren in der Medizin bis hin zu Datenspeichern. Physikalisch betrachtet sind Magnetismus und magnetische Ordnung rein quantenmechanische Erscheinungen. Quanteneffekte können die magnetische Ordnung aber auch verhindern. Systeme, in denen dies der Fall ist, zeigen eine Vielzahl neuer und spektakulärer Eigenschaften.
description: Ruperto Carola, Nr. 8 (2016): Nord & Süd
Reduction of Thermomechanical Stress Using Electrically Conductive Adhesives
Creators: name: Geipel, Torsten
name: Rendler, Li Carlos
name: Stompe, Manuel
name: Eitner, Ulrich
name: Rissing, Lutz
Publisher: name: Amsterdam : Elsevier
Year: 2015
Subjects: subject: Electrically Conductive Adhesives
subject: Finite Element Model
subject: Interconnection
subject: Photovoltaic Module
subject: Thermomechanical Stress
subject: Adhesives
subject: Busbars
subject: Elastic moduli
subject: Electric power system interconnection
subject: Finite element method
subject: Photovoltaic cells
subject: Silicon
subject: Tensile stress
subject: Tensile testing
subject: Bending experiments
subject: Cell interconnection
subject: Electrically conductive adhesives
subject: Material parameter
subject: Photovoltaic modules
subject: Thermo-mechanical stress
subject: Compressive stress
subject: Konferenzschrift
subject: Dewey Decimal Classification::500 | Naturwissenschaften
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: We compare the thermomechanical stresses in solar cell interconnections based on electrically conductive adhesives (ECA) with soldered joints by using bending experiments and finite element analysis (FEA). Additionally, the influence of an increasing number of busbars is studied. The FEA is validated by measuring the bending of cell strips after cooling down from a single-sided interconnection process. The material parameters are determined by tensile tests, microscopy and nanoindentation. The comparison of ECA and soldering shows that an elastomer with a Young's modulus of below 0.5 GPa is capable of reducing the thermomechanical stress effectively resulting in, approximately, a mean tensile stress in the ECA of 5 MPa, 110 MPa in the ribbon, and a maximum compressive stress in the silicon of 75 MPa. Increasing the number of busbars from three to five leads to a reduction in compressive stresses in the silicon and a slight increase of the peak tensile stress in the busbars.
Transition Temperature and Upper Critical Field in SmFeAsO1-xFx Synthesized at Low Heating Temperatures
Creators: name: Singh, S. J.
name: Shimoyama, J.
name: Yamamoto, A.
name: Ogino, H.
name: Kishio, K.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Low-temperature synthesis is a promising and potentially effective method for improving superconducting properties. We report on the fabrication of polycrystalline samples of SmFeAsO1-xFx with nominal x content varying in a wide range of x = 0-0.35 synthesized at 900 deg C. This synthesis temperature is around 300 deg C lower than the conventional synthesis temperature. The variation in the lattice parameters and transition temperature (Tc) of various F-doped samples indicates that reduction of the unit cell volume (V) seems to be the main reason for the rise of Tc up to 57.8 K. Magnetoresistance measurements showed that the upper critical field slope (dHc2/dT) increased with increasing F concentration up to x = 0.2, where it reached a maximum value of -8 T/K corresponding to a coherence length of 10 angstrom. At still higher F doping levels, dHc2/dT and the low field Jc decreased; above 0.5 T, however, Jc had almost the same value. Compared with previous reports, the present synthesis route with low synthesis temperatures and commonly available FeF2 as the source of F is more effective at introducing F into the SmFeAsO system and thereby resulting in improved superconducting properties for the system. In addition, this new sample preparation method also reduces unnecessary problems such as the evaporation of F and reaction between the crucible and superconductor during the solid-state reaction.
Mass-Radius Relationships for Very Low Mass Gaseous Planets
Creators: name: Batygin, Konstantin
name: Stevenson, David J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Recently, the Kepler spacecraft has detected a sizable aggregate of objects, characterized by giant-planet-like radii and modest levels of stellar irradiation. With the exception of a handful of objects, the physical nature, and specifically the average densities, of these bodies remain unknown. Here, we propose that the detected giant planet radii may partially belong to planets somewhat less massive than Uranus and Neptune. Accordingly, in this work, we seek to identify a physically sound upper limit to planetary radii at low masses and moderate equilibrium temperatures. As a guiding example, we analyze the interior structure of the Neptune-mass planet Kepler-30d and show that it is acutely deficient in heavy elements, especially compared with its solar system counterparts. Subsequently, we perform numerical simulations of planetary thermal evolution and in agreement with previous studies, show that generally, 10 - 20 Earth mass, multi-billion year old planets, composed of high density cores and extended H/He envelopes can have radii that firmly reside in the giant planet range. We subject our results to stability criteria based on extreme ultraviolet radiation, as well as Roche-lobe overflow driven mass-loss and construct mass-radius relationships for the considered objects. We conclude by discussing observational avenues that may be used to confirm or repudiate the existence of putative low mass, gas-dominated planets.
description: 5 pages, 3 figures, accepted to ApJL
Comment on “An approach to sulfate geoengineering with surface emissions of carbonyl sulfide” by Quaglia et al. (2022)
Creators: name: von Hobe, Marc
name: Brühl, Christoph
name: Lennartz, Sinikka T.
name: Whelan, Mary E.
name: Kaushik, Aleya
Publisher: name: Forschungzentrum Jülich
Year: 2023

description: doi:10.5194/egusphere-2023-268
Domestizierte Musik. Die „leichtsinnigen“ italienischen Gesänge
Creators: name: Groote, Inga Mai
Publisher: name: Ruperto Carola
Year: 2016

description: Der Süden Europas – und besonders Italien – ist aus Perspektive des Nordens ein Sehnsuchtsort. Diese Faszination gilt insbesondere für die Musik und die Oper, eine italienische „Erfindung“. Ein Blick in die frühe Neuzeit jedoch zeigt, dass der musikalische Import zunächst mit stereotypen Vorwürfen wie Laszivität oder Oberflächlichkeit verbunden war. Diese Abwehr galt vorrangig den Texten; ihre klanglichen Qualitäten allerdings machten die leichteren italienischen Gattungen zu einem so attraktiven Modell, dass sie auf längere Sicht erfolgreich importiert und adaptiert wurden – wenn auch zuweilen in domestizierter Form.
description: Ruperto Carola, Nr. 8 (2016): Nord & Süd
Inverse determination of constitutive equations and cutting force modelling for complex tools using oxley's predictive machining theory
Creators: name: Denkena, Berend
name: Grove, Thilo
name: Dittrich, Marc-André
name: Niederwestberg, D.
name: Lahres, M.
Publisher: name: Amsterdam : Elsevier
Year: 2015
Subjects: subject: Force
subject: Material
subject: Simulation
subject: Carbon
subject: Carbon steel
subject: Computation theory
subject: Constitutive equations
subject: Constitutive models
subject: Cutting
subject: Cutting tools
subject: Inverse problems
subject: Machining centers
subject: Materials
subject: Particle swarm optimization (PSO)
subject: Complex tool geometry
subject: Constitutive parameters
subject: Material removal model
subject: Temperature calculation
subject: Ultrahigh carbon steel
subject: Undeformed chip thickness
subject: Finite element method
subject: Konferenzschrift
subject: Dewey Decimal Classification::500 | Naturwissenschaften
subject: Dewey Decimal Classification::500 | Naturwissenschaften::510 | Mathematik

description: In analysis of machining processes, finite element analysis is widely used to predict forces, stress distributions, temperatures and chip formation. However, constitutive models are not always available and simulation of cutting processes with complex tool geometries can lead to extensive computation time. This article presents an approach to determine constitutive parameters of the Johnson-Cook's flow stress model by inverse modelling as well as a methodology to predict process forces and temperatures for complex three-dimensional tools using Oxley's machining theory. In the first part of this study, an analytically based computer code combined with a particle swarm optimization (PSO) algorithm is used to identify constitutive models for 70MnVS4 and an aluminium-alloyed ultra-high-carbon steel (UHC-steel) from orthogonal milling experiments. In the second part, Oxley's predictive machining theory is coupled with a multi-dexel based material removal model. Contact zone information (width of cut, undeformed chip thickness, rake angle and cutting speed) are calculated for incremental segments on the cutting edge and used as input parameters for force and temperature calculations. Subsequently, process forces are predicted for machining using the inverse determined constitutive models and compared to actual force measurements. The suggested methodology has advantages regarding the computation time compared to finite element analyses.
The Structure of the X-ray and Optical Emitting Regions of the Lensed Quasar Q 2237+0305
Creators: name: Mosquera, A. M.
name: Kochanek, C. S.
name: Chen, B.
name: Dai, X.
name: Blackburne, J. A.
name: Chartas, G.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We use gravitational microlensing to determine the size of the X-ray and optical emission regions of the quadruple lens system Q 2237+0305. The optical half-light radius, log(R_{1/2,V}/cm)=16.41\pm0.18 (at lambda_{rest}=2018 Å), is significantly larger than the observed soft, log(R_{1/2,soft}/cm)=15.76^{+0.41}_{-0.34} (1.1-3.5 keV in the rest frame), and hard, log(R_{1/2,hard}/cm)=15.46^{+0.34}_{-0.29} (3.5-21.5 keV in the rest frame), band X-ray emission. There is a weak evidence that the hard component is more compact than the soft, with log(R_{1/2,soft}/R_{1/2,hard}) \sim 0.30^{+0.53}_{-0.45}. This wavelength-dependent structure agrees with recent results found in other lens systems using microlensing techniques, and favors geometries in which the corona is concentrated near the inner edge of the accretion disk. While the available measurements are limited, the size of the X-ray emission region appears to be roughly proportional to the mass of the central black hole.
description: 22 pages, 8 figures, submitted to ApJ
Model-based feedback control of an ultrasonic transducer for ultrasonic assisted turning using a novel digital controller
Creators: name: Ille, I.
name: Twiefel, J.
Publisher: name: Amsterdam : Elsevier
Year: 2015
Subjects: subject: Averaging Model
subject: Feedback Control
subject: Model-based
subject: Resonating Systems
subject: Cutting tools
subject: Feedback control
subject: Natural frequencies
subject: Resonance
subject: Stability criteria
subject: Transducers
subject: Turning
subject: Ultrasonic transducers
subject: Material inhomogeneity
subject: Model based feedback controls
subject: Model-based OPC
subject: Phase sensitive demodulation
subject: Resonance frequencies
subject: Time-variant parameters
subject: Ultrasonic assisted turnings
subject: Controllers
subject: Konferenzschrift
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: Ultrasonic turning has time variant parameters due to temperature effects and changing load conditions during the process. This results in a change of the resonance frequency and vibration amplitude. To realize constant vibration amplitudes it is necessary to control the ultrasonic transducer by a suitable feedback controller. One approach to drive such a system is to use the resonance frequency as operating point in connection with an amplitude feedback controller. The advantages of resonant driven low damped systems are low voltages and high values of effective power. This paper presents a digital system used for parameter identification and model-based feedback control of the ultrasonic turning tool. During the turning process the system load depends on several factors like chip formation, material inhomogeneity, warming and tool wear. To achieve a stable process and a uniform surface of the work piece the feedback controller has to guarantee constant vibration amplitudes of the ultrasonic tool. The controller used in this paper consists of a digital resonance controller and a current amplitude controller with a frequency of 500 Hz. The current amplitude and phase between the excitation voltage and current are determined by phase sensitive demodulation (PSD). To determine the feedback parameters a model-based approach is used.