cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
MPEC 2023-L82 : DAILY ORBIT UPDATE (2023 June 15)
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2023
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Modeling Overpotentials Related to Mass Transport through Porous Transport Layers of PEM Water Electrolysis Cells
Creators: name: Schmidt, Gergely
name: Suermann, Michel
name: Bensmann, Boris
name: Hanke-Rauschenbach, Richard
name: Neuweiler, Insa
Publisher: name: Bristol : IOP Publishing Ltd.
Year: 2020
Subjects: subject: Electrodes
subject: Electrolysis
subject: Porous materials
subject: Diffusive mass transport
subject: Operating pressure
subject: PEM water electrolysis
subject: Porous transport layers
subject: Proton exchange membranes
subject: Research opportunities
subject: Species transport
subject: Water electrolysis
subject: Proton exchange membrane fuel cells (PEMFC)
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau
subject: Dewey Decimal Classification::600 | Technik::660 | Technische Chemie

description: Porous transport layers (PTL) are key components of proton exchange membrane water electrolysis (PEMWE) cells controlling species transport. Further optimization requires better understanding of how PTLs influence overpotentials. In this work, the data from an electrochemical overpotential breakdown is compared to a state-of-the-art model, which includes a Nernstian overpotential description, two-phase Darcian flow and advective-diffusive mass transport. Model parameters are derived from X-ray tomographic measurements, pore-scale calculations, standard models for porous materials and by transferring ex situ measurements from other materials. If the parameter set is available, model results and experimental data match well concerning PTL-related overpotentials at different current densities and operating pressures. Both experimental and modeling results suggest that mass transport through PTLs does not affect a considerable, pressure-independent share of mass transport overpotentials. Both model results and experimental findings conclude that mass transport through the cathode PTL causes overpotentials more than twice as high as through its anode counterpart. Further research opportunities regarding the relationship between PTL bulk properties and experimentally determined mass transport overpotentials are identified. © 2020 The Author(s). Published on behalf of The Electrochemical Society by IOP Publishing Limited.
Potamogeton gramineus L.
Creators: name: Becherer
Publisher: name: Zenodo
Year: 1956
Subjects: Biodiversity
Taxonomy

description: R. gramineus L. Cat. 8. Vgl. Marietan Lit. 1949. Die Standortsangabe des Cat.: pelouses sablonneuses, für den Walliser Locus classicus ist unzureichend. Die Fundstellen sind nach E. THOMMEN (mündlich), der den ökologischen Verhältnissen bei St-Leonard nachgegangen ist, tiefgründige, im Winter und Vorfrühling feuchte, später trockene, locker beraste IVtulden auf Kalk- oder Quarzitunterlage. 2: Sex-de-Gru bei Ardon, spärlich (Terretaz 1950 und 1953); bei St-Leonard noch immer, und zwar mehrfachund reichlich (IV[arietan,Thommen u. a.).
description: Published as part of Becherer, 1956, Florae Vallesiacae Supplementum, pp. 1-556 in Denkschriften der Schweizerischen Naturforschenden Gesellschaft 71 on pages 1-556
Integrality of Twisted $L$-Values of Elliptic Curves
Creators: name: Wiersema, Hanneke
name: Wuthrich, Christian
Publisher: name: Deutsche Mathematiker-Vereinigung
Year: 2022

description: Under suitable, fairly weak hypotheses on an elliptic curve $E/\mathbb{Q}$ and a primitive non-trivial Dirichlet character $\chi$, we show that the algebraic $L$-value $\mathscr{L}(E,\chi)$ at $s=1$ is an algebraic integer. For instance, for semistable curves $\mathscr{L}(E,\chi)$ is integral whenever $E$ admits no isogenies defined over $\mathbb{Q}$. Moreover we give examples illustrating that our hypotheses are necessary for integrality to hold.
description: DOCUMENTA MATHEMATICA, Vol 27 (2022), p. 2041-2066
Numerical simulation and experimental validation of the cladding material distribution of hybrid semi-finished products produced by deposition welding and cross-wedge rolling
Creators: name: Kruse, Jens
name: Mildebrath, Maximilian
name: Budde, Laura
name: Coors, Timm
name: Faqiri, Mohamad Yusuf
name: Barroi, Alexander
name: Stonis, Malte
name: Hassel, Thomas
name: Pape, Florian
name: Lammers, Marius
name: Hermsdorf, Jörg
name: Kaierle, Stefan
name: Overmeyer, Ludger
name: Poll, Gerhard
Publisher: name: Basel : MDPI AG
Year: 2020
Subjects: subject: Coating
subject: Cross-wedge rolling
subject: Forming
subject: LMD-W
subject: PTA
subject: Rolling
subject: Tailored forming
subject: Welding
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: The service life of rolling contacts is dependent on many factors. The choice of materials in particular has a major influence on when, for example, a ball bearing may fail. Within an exemplary process chain for the production of hybrid high-performance components through tailored forming, hybrid solid components made of at least two different steel alloys are investigated. The aim is to create parts that have improved properties compared to monolithic parts of the same geometry. In order to achieve this, several materials are joined prior to a forming operation. In this work, hybrid shafts created by either plasma (PTA) or laser metal deposition (LMD-W) welding are formed via cross-wedge rolling (CWR) to investigate the resulting thickness of the material deposited in the area of the bearing seat. Additionally, finite element analysis (FEA) simulations of the CWR process are compared with experimental CWR results to validate the coating thickness estimation done via simulation. This allows for more accurate predictions of the cladding material geometry after CWR, and the desired welding seam geometry can be selected by calculating the cladding thickness via CWR simulation. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.
Sign-reversal of the in-plane resistivity anisotropy in iron pnictides
Creators: name: Blomberg, E. C.
name: Tanatar, M. A.
name: Fernandes, R. M.
name: Mazin, I. I.
name: Shen, Bing
name: Wen, Hai-Hu
name: Johannes, M. D.
name: Schmalian, J.
name: Prozorov, R.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The concept of an electronically-driven breaking of the rotational symmetry of a crystal, without involving magnetic order, has found experimental support in several systems, from semiconductor heterostructures and ruthenates, to cuprate and iron-pnictide superconductors. In the pnictide BaFe$_{2}$As$_{2}$, such an "electronic nematic state" appears above the magnetic transition dome, over a temperature range that can be controlled by external strain. Here, by measuring the in-plane resistivity anisotropy, we probe the electronic anisotropy of this material over the entire nematic/magnetic dome, whose end points coincide with the optimal superconducting transition temperatures. Counter-intuitively, we find that, unlike other materials, the resistivity anisotropy in BaFe$_{2}$As$_{2}$ changes sign across the doping phase diagram, even though the signs of the magnetic, nematic, and orthorhombic order parameters are kept fixed. This behavior is explained by the Fermi surface reconstruction in the magnetic phase and spin-fluctuation scattering in the nematic phase. The unique behavior of the transport anisotropy unveils that the primary role is played by magnetic scattering in the normal state transport properties of the iron pnictides, suggesting a close connection between magnetism, nematicity, and unconventional superconductivity.
Atomic-Layer-Deposited Al2O3 as Effective Barrier against the Diffusion of Hydrogen from SiNx:H Layers into Crystalline Silicon during Rapid Thermal Annealing
Creators: name: Helmich, Lailah
name: Walter, Dominic C.
name: Bredemeier, Dennis
name: Schmidt, Jan
Publisher: name: Weinheim : Wiley-VCH
Year: 2020
Subjects: subject: Alumina
subject: Aluminum coatings
subject: Aluminum oxide
subject: Atomic layer deposition
subject: Atoms
subject: Belt conveyors
subject: Boron
subject: Diffusion barriers
subject: Passivation
subject: Pulsed laser deposition
subject: Rapid thermal annealing
subject: Rapid thermal processing
subject: Refractive index
subject: Semiconductor materials
subject: Silicon nitride
subject: Atomic layer deposited
subject: Chemical vapor deposited
subject: Crystalline silicons
subject: Hydrogen diffusion barriers
subject: Measured temperatures
subject: Plasma assisted atomic layer depositions
subject: Rapid thermal annealing (RTA)
subject: Temperature dependent
subject: Silicon wafers
subject: aluminum oxide
subject: defects
subject: diffusion
subject: hydrogen
subject: silicon
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: Stacks of hydrogen-lean aluminum oxide, deposited via plasma-assisted atomic-layer-deposition, and hydrogen-rich plasma-enhanced chemical vapor-deposited silicon nitride (SiNx) are applied to boron-doped float-zone silicon wafers. A rapid thermal annealing (RTA) step is performed in an infrared conveyor-belt furnace at different set-peak temperatures. The hydrogen content diffused into the crystalline silicon during the RTA step is quantified by measurements of the silicon resistivity increase due to hydrogen passivation of boron dopant atoms. These experiments indicate that there exists a temperature-dependent maximum in the introduced hydrogen content. The exact position of this maximum depends on the composition of the SiNx layer. The highest total hydrogen content, exceeding 1015 cm−3, is introduced into the silicon bulk from silicon-rich SiNx layers with a refractive index of 2.3 (at λ = 633 nm) at an RTA peak temperature of 800 °C, omitting the Al2O3 interlayer. Adding an Al2O3 interlayer with a thickness of 20 nm reduces the hydrogen content by a factor of four, demonstrating that Al2O3 acts as a highly effective hydrogen diffusion barrier. Measuring the hydrogen content in the silicon bulk as a function of Al2O3 thickness at different RTA peak temperatures provides the hydrogen diffusion length in Al2O3 as a function of measured temperature.
Coaxial Alginate Hydrogels : From Self-Assembled 3D Cellular Constructs to Long-Term Storage
Creators: name: Gryshkov, Oleksandr
name: Mutsenko, Vitalii
name: Tarusin, Dmytro
name: Khayyat, Diaa
name: Naujok, Ortwin
name: Riabchenko, Ekaterina
name: Nemirovska, Yuliia
name: Danilov, Arseny
name: Petrenko, Alexander Y.
name: Glasmacher, Birgit
Publisher: name: Basel : Molecular Diversity Preservation International
Year: 2021
Subjects: subject: cell encapsulation
subject: coaxial electrospraying
subject: tissue cryopreservation
subject: core-shell capsules
subject: scaffolds
subject: cellular structures
subject: multipotent stromal cells
subject: thermomechanical stress
subject: RAMAN spectroscopy
subject: swelling
subject: Dewey Decimal Classification::500 | Naturwissenschaften::570 | Biowissenschaften, Biologie
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie

description: Alginate as a versatile naturally occurring biomaterial has found widespread use in the biomedical field due to its unique features such as biocompatibility and biodegradability. The ability of its semipermeable hydrogels to provide a favourable microenvironment for clinically relevant cells made alginate encapsulation a leading technology for immunoisolation, 3D culture, cryopreservation as well as cell and drug delivery. The aim of this work is the evaluation of structural properties and swelling behaviour of the core-shell capsules for the encapsulation of multipotent stromal cells (MSCs), their 3D culture and cryopreservation using slow freezing. The cells were encapsulated in core-shell capsules using coaxial electrospraying, cultured for 35 days and cryopreserved. Cell viability, metabolic activity and cell–cell interactions were analysed. Cryopreservation of MSCs-laden core-shell capsules was performed according to parameters pre-selected on cell-free capsules. The results suggest that core-shell capsules produced from the low viscosity high-G alginate are superior to high-M ones in terms of stability during in vitro culture, as well as to solid beads in terms of promoting formation of viable self-assembled cellular structures and maintenance of MSCs functionality on a long-term basis. The application of 0.3 M sucrose demonstrated a beneficial effect on the integrity of capsules and viability of formed 3D cell assemblies, as compared to 10% dimethyl sulfoxide (DMSO) alone. The proposed workflow from the preparation of core-shell capsules with self-assembled cellular structures to the cryopreservation appears to be a promising strategy for their off-the-shelf availability.
title: H.P. Uenze und J. Katzameyer, Vor- und Frühgeschichte in den Landkreisen Bad Tölz und Miesbach, 1972
Creators: name: Schröter, Peter
Publisher: name: University Library Heidelberg
Year: 2016

description: Rezension zu: H.P. Uenze & J. Katzameyer, Vor- und Frühgeschichte in den Landkreisen Bad Tölz und Miesbach. Kataloge der Prähistorischen Staatssammlung 9, Verlag M. Lassleben, Kallmünz/ Opf. 1972
Polymer Optical Waveguide Sensor Based on Fe-Amino-Triazole Complex Molecular Switches
Creators: name: Khan, Muhammad Shaukat
name: Farooq, Hunain
name: Wittmund, Christopher
name: Klimke, Stephen
name: Lachmayer, Roland
name: Renz, Franz
name: Roth, Bernhard
Publisher: name: Basel : MDPI
Year: 2021
Subjects: subject: polymer optical sensor
subject: microfabrication
subject: temperature sensor
subject: memory effect
subject: iron-triazole complexes
subject: hot embossing
subject: maskless lithography
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie

description: We report on a polymer-waveguide-based temperature sensing system relying on switchable molecular complexes. The polymer waveguide cladding is fabricated using a maskless lithographic optical system and replicated onto polymer material (i.e., PMMA) using a hot embossing device. An iron-amino-triazole molecular complex material (i.e., [Fe(Htrz)2.85(NH2-trz)0.15](ClO4)2) is used to sense changes in ambient temperature. For this purpose, the core of the waveguide is filled with a mixture of core material (NOA68), and the molecular complex using doctor blading and UV curing is applied for solidification. The absorption spectrum of the molecular complex in the UV/VIS light range features two prominent absorption bands in the low-spin state. As temperature approaches room temperature, a spin-crossover transition occurs, and the molecular complex changes its color (i.e. spectral properties) from violet-pink to white. The measurement of the optical power transmitted through the waveguide as a function of temperature exhibits a memory effect with a hysteresis width of approx. 12 °C and sensitivity of 0.08 mW/°C. This enables optical rather than electronic temperature detection in environments where electromagnetic interference might influence the measurements.
The dimension of projections of fractal percolations
Creators: name: Rams, Michal
name: Simon, Károly
Publisher: name: arXiv
Year: 2013
Subjects: subject: Dynamical Systems (math.DS)
subject: Probability (math.PR)
subject: FOS: Mathematics

description: \emph{Fractal percolation} or \emph{Mandelbrot percolation} is one of the most well studied families of random fractals. In this paper we study some of the geometric measure theoretical properties (dimension of projections and structure of slices) of these random sets. Although random, the geometry of those sets is quite regular. Our results imply that, denoting by $E\subset \mathbb{R}^2$ a typical realization of the fractal percolation on the plane, {itemize} If $\dim_{\rm H}E<1$ then for \textbf{all}lines $\ell$ the orthogonal projection $E_\ell$ of $E$ to $\ell$ has the same Hausdorff dimension as $E$, If $\dim_{\rm H}E>1$ then for any smooth real valued function $f$ which is strictly increasing in both coordinates, the image $f(E)$ contains an interval. {itemize} The second statement is quite interesting considering the fact that $E$ is almost surely a Cantor set (a {\it random dust}) for a large part of the parameter domain, see \cite{Chayes1988}. Finally, we solve a related problem about the existence of an interval in the algebraic sum of $d\geq 2$ one-dimensional fractal percolations.
description: Corrected version
Towards a Highly Sensitive Piezoelectric Nano-Mass Detectio : A Model-Based Concept Study
Creators: name: Twiefel, Jens
name: Glukhovkoy, Anatoly
name: De Wall, Sascha
name: Wurz, Marc Christopher
name: Sehlmeyer, Merle
name: Hitzemann, Moritz
name: Zimmermann, Stefan
Publisher: name: Basel : MDPI
Year: 2021
Subjects: subject: piezoelectric sensors
subject: nano-mass detection
subject: inertial balance
subject: resonance systems
subject: nano/micro-electro-mechanical-system
subject: N/MEMS
subject: co-resonance
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: The detection of exceedingly small masses still presents a large challenge, and even though very high sensitivities have been archived, the fabrication of those setups is still difficult. In this paper, a novel approach for a co-resonant mass detector is theoretically presented, where simple fabrication is addressed in this early concept phase. To simplify the setup, longitudinal and bending vibrations were combined for the first time. The direct integration of an aluminum nitride (AlN) piezoelectric element for simultaneous excitation and sensing further simplified the setup. The feasibility of this concept is shown by a model-based approach, and the underlying parameter dependencies are presented with an equivalent model. To include the geometrical and material aspects, a finite element model that supports the concept as a very promising approach for future nano-mass detectors is established.
title: G. Albrecht, J. Hahn & W.G. Torke, Merkmalanalyse von Geschoßspitzen des mittleren Jungpleistozäns in Mittel- und Osteuropa. Archaeologica Venatoria Bd. 2, 1972
Creators: name: Schröter, Peter
Publisher: name: University Library Heidelberg
Year: 2016

description: Rezension zu G. Albrecht, J. Hahn & W.G. Torke, Merkmalanalyse von Geschoßspitzen des mittleren Jungpleistozäns in Mittel- und Osteuropa. Archaeologica Venatoria Bd. 2, 1972. 1972. 107 S., 25 Abb. im Text, 14 Taf. u. eine Beilage. Verlag W. Kohlhammer, Stuttgart-Berlin-Köln-Mainz.
Digitization of Knowledge Management Methods: An Essential Approach
Creators: name: Panda, Subhajit
Publisher: name: figshare
Year: 2023
Subjects: Library studies
Library and information studies not elsewhere classified

description: Initiatives for digitization and knowledge management increasingly go hand in hand in the evolving global information society. While digitization initiatives refer to joint or collaborative efforts to convert existing library holdings, whether in print, graphic, audio, or a combination of all, into digital format commonly known as “electronic resources,” knowledge management (KM) refers to a range of practises used by organisations to identify, create, represent, and distribute knowledge. In today’s electronic environment, digitization activities have emerged as a pillar of knowledge management. The paper begins by highlighting the challenges that institutions face in transitioning from a physical environment to a digital one. The objectives of the study are then outlined, including providing a clear understanding of digitization, exploring knowledge management strategies, categorizing digital tools, analyzing digitization processes in KM methods, and examining an example of digitization in a library setting. The future scope of digitization of KM methods in libraries is also discussed, including the potential integration of AI and machine learning technologies, virtual and augmented reality, and more sophisticated analytics and reporting tools. The paper concludes by emphasizing the importance of assessing the current workforce and gradually increasing digitalization with proper support from both employees and management.
Investigation on Aging of Metallic Surface Integrated Micro-POFs
Creators: name: Hachicha, B.
name: Overmeyer, Ludger
Publisher: name: Amsterdam : Elsevier B.V.
Year: 2016
Subjects: subject: Coupling
subject: Optical communication
subject: Beam (structure)
subject: Materials science
subject: Optical fiber
subject: Vibration
subject: Electronic engineering
subject: Waveguide (optics)
subject: Fiber
subject: Metal
subject: Dewey Decimal Classification::600 | Technik

description: Surface integrated optical waveguides present a possibility to realize inherent communication structures. Optical communication is used particularly by smart parts exposed to humidity, high vibration or electromagnetic fields. We developed a method to integrate micro-polymer optical fibers ( μ -POFs) into metallic surfaces using the dispensing process. After positioning, the μ -POFs are bonded to the surface by dispensing UV-curing adhesives. The bonded optical waveguide is coupled at its end-facets respectively to sender or receiver elements. Efficiency of the coupling depends on the alignment stability of the polymer fiber to beam sender or receiver. In operating conditions the smart parts undergo aging due to thermal and mechanical stress. We investigated the possible influence of this aging on the position stability of bonded μ -POFs, and consequently on the optical communication efficiency. The experimental set-up as well as the measurements are presented and discussed in this article.
title: Chr. Osterwalder, Die mittlere Bronzezeit im schweizerischen Mittelland und Jura, Basel 197
Creators: name: Schröter, Peter
Publisher: name: University Library Heidelberg
Year: 2016

description: Rezension zu: Chr. Osterwalder, Die mittlere Bronzezeit im schweizerischen Mittelland und Jura. Monographien zur Ur- und Frühgeschichte der Schweiz 19. Schweizerische Gesellschaft für Ur- und Frühgeschichte, Basel 1971, 97 S., 1 Abb., 2 Karten, 61 Taf.
The subset argument and consistency of MLE in GLMM: Answer to an open problem and beyond
Creators: name: Jiang, Jiming
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics

description: We give answer to an open problem regarding consistency of the maximum likelihood estimators (MLEs) in generalized linear mixed models (GLMMs) involving crossed random effects. The solution to the open problem introduces an interesting, nonstandard approach to proving consistency of the MLEs in cases of dependent observations. Using the new technique, we extend the results to MLEs under a general GLMM. An example is used to further illustrate the technique.
description: Published in at http://dx.doi.org/10.1214/13-AOS1084 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Machining of Micro Dimples for Friction Reduction in Cylinder Liners
Creators: name: Denkena, Berend
name: Grove, Thilo
name: Schmidt, Carsten
Publisher: name: Amsterdam : Elsevier B.V.
Year: 2018
Subjects: subject: Combustion
subject: Composite material
subject: Tribology
subject: Materials science
subject: Cylinder
subject: Lubricant
subject: Piston
subject: Machining
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::600 | Technik::670 | Industrielle und handwerkliche Fertigung

description: In combustion engines a large percentage of mechanical losses result from friction, for example within the cylinder liner. In order to reduce the friction between cylinder liner and piston, micro dimples in the surface decrease the internal friction of combustion engines. These dimples hold back lubricant from being pressed out of the tribological contact zone which enhances the friction behaviour. Competing processes such as laser material removal allow micro dimples to be generated at high productivity. Therefore the process time of machining micro dimples needs to be reduced in order to maintain low production costs. For this purpose a rotating single-toothed tool is used in an axially parallel turn-milling process. The aim of this paper is to show the investigation of productive machining and the effect of the micro dimples in heavy duty cylinder liners. The cutting behaviour is investigated by analyzing micro dimples cut at high speed concerning their burr formation and geometrical deviations.
Investigation of masking concepts for influencing the austenitization process during press hardening
Creators: name: Behrens, Bernd-Arno
name: Hübner, Sven
name: Chugreev, Alexander
name: Bohne, Florian
name: Seel, Andreas
name: Jalanesh, Masood
name: Wölki, Kai
Publisher: name: Amsterdam : Elsevier B.V.
Year: 2018
Subjects: subject: Masking (art)
subject: Composite material
subject: Materials science
subject: Hot stamping
subject: Microstructure
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: One possibility to adjust tailored properties in hot stamping is the application of a masking concept to prevent a complete austenitization. In this study different concepts were investigated in order to use them as a suitable masking. A simulation model of the heating phase was developed for the purpose of predicting the resulting microstructure and hardness. Experimentally determined temperature profiles were used for the numerical model. The numerical results of the temperature profile and hardness were validated by experimental investigations and non-destructive hardness measurements. The simulated hardness is in adequate agreement with the measured hardness.
title: Archäologische Informationen, Vol 8, No 2 (1985): Archäologische Informationen
Creators: name: DGUF E.V.
Publisher: name: University Library Heidelberg
Year: 2016

description: Prospektion
description: Prospektion
description: Titel
 Vorwort...98-99
 Inhalt...100-101
 Sammeln oder Suchen? Anmerkungen zur archäologischen Feldbegehung...102-110
 Archäologische Prospektion durch systematische Oberflächenbegehungen an Beispielen aus Dithmarschen...110-117
 Systematische Oberflächenprospektion von Kleinlandschaften - Probleme bei der Interpretation ihrer Ergebnisse...117-124
 Lufbildarchäologie, ein Wintermärchen?...125-134
 Luftbild, Magnetik und digitale Bildverarbeitung zur Prospektion archäologischer Fundstätten...135-142
 Prospektionsmöglichkeiten im Bereich der mittelalterlichen Stadtkernarchäologie...143-149
 Nahbereichsphotogammetrie und ihre Anwendungsmöglichkeiten für die Archäologie...150-161
 Hobbyarchäologie, Amateurarchäologie oder Heimatforschung...165-167
 Problemen von Nomenklatur und Datenbankstrukturen bei der Normierung archäologischer Informationen...171
 Die Seriation hügelgräberbronzezeitlicher Grabinventare aus Hessen und Südthüringen...172
 LITHOS I...173-175
 Archäologie in den Museen der Stadt Regensburg...176-178
 Studienortwechsel – kein Thema für Anfänger?...182-185
 Umingmak – ein Moschusochsenjagdplatz auf Banks Island, N.W.T., Canada. – Archäozoologische Auswertung des Areals ID –...188-190
 Die Urnenfelderzeit in der Niederrheinischen Bucht...190-192
 Bronze- und eisenzeitliche Besiedlung in den Rheinischen Lößbörden – archäologische Siedlungsmuster im Braunkohlengebiet...192-195
 Studien an Siedlungskeramik. Ausgewählte Merkmale und Fundkomplexe der Latène- und der Römischen Kaiserzeit aus Geismar, Schwalm-Eder-Kreis...195-197
 Gerhard Bosinski, Der Neandertaler und seine Zeit, Köln...204-205
 Ernst-Rainer Hönes, Denkmalschutz und Denkmalpflege in Rheinland-Pfalz, 1984...205-206
 Nachrichten...207-208
 Archäologische Arbeitsgemeinschaft an der Hauptschule in Mülheim-Kärlich bei Koblenz...179-181
 University of London, Institute of Archaeology Summer Schools...186
 Ausgrabungskurs...187
Evaluation of micro-damage by acoustic methods
Creators: name: Gerstein, Gregory
name: Briukhanov, Arkadii
name: Gutknecht, Florian
name: Volchok, Natalia
name: Clausmeyer, Till
name: Nürnberger, Florian
name: Tekkaya, A. Erman
name: Maier, Hans Jürgen
Publisher: name: Amsterdam : Elsevier B.V.
Year: 2018
Subjects: subject: Resonance
subject: Ultimate tensile strength
subject: Ferrite (iron)
subject: Composite material
subject: Material flow
subject: Materials science
subject: Sheet metal
subject: Ultrasonic sensor
subject: Electron microscope
subject: Forging
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: Several methods for the determination of integral damage in sheet metal are reviewed and investigated at the example of the ferritic steel DC04. A novel method to determine damage in cylindrical rings is proposed. Such a method is useful for the measurement of damage in components manufactured by sheet-bulk forming. In sheet-bulk-forming or precision forging sheets with a thickness in the range of 1-5 mm are processed by making use of an intended three-dimensional material flow to form toothed components such as gears. Damage leads to the modification of physical properties, such as Young’s modulus and the related resonance frequency. Young’s moduli were determined by various methods such as tensile tests and the frequency of natural oscillations of rectangular samples as well as cylindrical rings. Additionally, the change in the propagation velocity of ultrasonic waves in rectangular bars was examined as a damage criterion and reference measurements of damage by electron microscopy were carried out. The damage values obtained by electron microscopy are consistent with the results of the other investigated methods.
Direct observation of particles with energy >10 MeV/u from laser-induced fusion in ultra-dense deuterium
Creators: name: Holmlid, Leif
Publisher: name: arXiv
Year: 2013
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Nuclear fusion in ultra-dense deuterium D(-1) induced by 0.2 J pulses with 5 ns pulse length ejects ions with energies in the MeV range. The ns-resolved signal to a collector can be observed directly on an oscilloscope, showing ions arriving with energies in the range 2-14 MeV u-1 at flight times 12-100 ns, mainly protons from the fusion process and deuterons ejected by proton collisions. Electrons and photons give almost no contribution to the fast signal. The observed signal at several mA peak current corresponds to 1x10^13 particles released per laser shot and to an energy release > 1 J assuming isotropic formation and average particle energy of 3 MeV as observed. A movable slit close to the laser target gives spatial resolution of the signal generation, showing almost only fast ions from the point of laser impact and penetrating photons from the plasma outside the laser impact point. The initial photon pulse from the fusion process is observed by a photomultiplier detector on-line.
description: 11 figures
Energy-efficient control of dust extraction for the machining of fibre-reinforced plastics
Creators: name: Denkena, Berend
name: Bergmann, Benjamin
name: Rahner, Björn-Holger
Publisher: name: Amsterdam : Elsevier B.V.
Year: 2018
Subjects: subject: Explosive material
subject: Automotive engineering
subject: Volumetric flow rate
subject: Materials science
subject: Electrical conductor
subject: Efficient energy use
subject: Engine power
subject: Abrasive
subject: Machining
subject: Machine tool
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::600 | Technik::670 | Industrielle und handwerkliche Fertigung

description: Fibre-reinforced plastics (FRPs) are becoming increasingly important in aerospace and automotive applications. However, dry machining of FRPs generates abrasive and electrically conductive dust particles that can furthermore cause explosive dust-air mixtures in the enclosed workspace of the machine tool. In order to protect the machine operator and the machine tool, powerful extraction systems (engine power > 5 kW) are usually installed and operated with a constant flow rate, resulting in a significant increase of the machine tool’s overall energy requirement. This paper introduces a novel approach for a demand-oriented control of the flow rate to increase the energy efficiency of dust extraction systems. The objective of the developed control mechanisms is to maintain the maximum permissible dust limit with minimum energy demand. A low-cost dust sensor serves as a feedback system for the applied control mechanism. In a further stage, a force measuring platform was added to provide additional signals for an increased performance of the controlled system. To evaluate the presented approach, milling tests were carried out with carbon-fibre-reinforced plastic (CFRP). The experimental results show that the energy requirement can be reduced by up to 70%.
Increased performance in high speed turning of Inconel 718 by laser structuring of PcBN tools
Creators: name: Denkena, Berend
name: Grove, Thilo
name: Krödel, Alexander
name: Ellersiek, Lars
Publisher: name: Amsterdam : Elsevier B.V.
Year: 2018
Subjects: subject: Surface roughness
subject: Composite material
subject: Materials science
subject: Surface integrity
subject: Diamond
subject: Grinding
subject: Inconel
subject: Pulsed laser
subject: Residual stress
subject: Laser
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::600 | Technik::670 | Industrielle und handwerkliche Fertigung

description: In order to improve the cutting performance of PcBN tools, the cutting edge is prepared e.g. by grinding or brushing. Since PcBN is the second hardest material besides diamond, mechanical preparation of PcBN tools is associated with high wear and low productivity, which leads to high process costs. The laser preparation provides a high potential in preparing PcBN tools because of its wear free technology and its short process times. Additionally, several authors have shown that laser preparation can also lead to beneficial effects such as hardness increase or increased compressive residual stresses. Although these effects are known, they have not been linked to cutting performance of PcBN tools. This paper investigates the influence of nanosecond pulsed laser preparation of the cutting edge and the resulting surface topography on the cutting performance. Therefore, PcBN cutting tools were prepared with different laser velocities at the cutting edge and applied in high speed turning of Inconel 718. Surface integrity of the prepared tools was investigated regarding hardness, surface roughness and edge quality. Afterwards, the prepared tools are used in turning experiments, showing a decreasing flank wear of 40 % compared to reference tools. Tool life increase is linked to beneficial frictional behavior and less adhesive wear of the laser machined specimens compared to conventional tools.
A Potential Super-Venus in the Kepler-69 System
Creators: name: Kane, Stephen R.
name: Barclay, Thomas
name: Gelino, Dawn M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Transiting planets have greatly expanded and diversified the exoplanet field. These planets provide greater access to characterization of exoplanet atmospheres and structure. The Kepler mission has been particularly successful in expanding the exoplanet inventory, even to planets smaller than the Earth. The orbital period sensitivity of the Kepler data is now extending into the Habitable Zones of their host stars, and several planets larger than the Earth have been found to lie therein. Here we examine one such proposed planet, Kepler-69c. We provide new orbital parameters for this planet and an in-depth analysis of the Habitable Zone. We find that, even under optimistic conditions, this 1.7 R$_\oplus$ planet is unlikely to be within the Habitable Zone of Kepler-69. Furthermore, the planet receives an incident flux of 1.91 times the solar constant, which is similar to that received by Venus. We thus suggest that this planet is likely a super-Venus rather than a super-Earth in terms of atmospheric properties and habitability, and we propose follow-up observations to disentangle the ambiguity.
description: 6 pages, 3 figures, accepted for publication in ApJL
New thematic services from the EOSC-Pillar open call - poster
Creators: name: Müller, Sabine
name: Drago, Federico
Publisher: name: Zenodo
Year: 2022
Subjects: EOSC
Open Science
EOSC Portal

description: In the frame of EOSC-Pillar (WP6), an open call for thematic services has been launched end of 2020 with the aim of broadening the thematic scope of the nine already defined use cases of the work package and give additional non-conventional services the possibility to be supported by the experts associated in EOSC-Pillar. In total eight applications have been received, six of them have been selected as potential new use cases to be mentored within our project. The six selected applicants were invited to present more detail on their services during a dedicated virtual hackathon organised in June 2021. This was the occasion for the service providers to specify exactly their needs and define joint support activities with the experts of the project. Finally, five service providers accepted to be part of the project as “new use cases”. An overview of the five “new” use cases and the relevant support by EOSC-Pillar is provided in this document. Ethnic and Migrant Minorities' (EMM) Survey Registry MMODA (Multi-Messenger Online Data Analysis) ReadMETRICS SIMBAD Thoth Learn more
Isolierung und Charakterisierung der Zinkfinger-Proteine Xegr-1 und Xegr-3 in der frühen Embryonalentwicklung des Krallenfrosches Xenopus laevis
Creators: name: Panitz, Frank
Publisher: name: Hannover : Universität
Year: 1998
Subjects: subject: Egr-1
subject: egr-3
subject: Xenopus laevis
subject: serum response element
subject: Dewey Decimal Classification::500 | Naturwissenschaften::570 | Biowissenschaften, Biologie
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie

description: [no abstract]
On Deligne's category $\uRep^{ab}(S_d)$
Creators: name: Comes, Jonathan
name: Ostrik, Victor
Publisher: name: arXiv
Year: 2013
Subjects: subject: Representation Theory (math.RT)
subject: Category Theory (math.CT)
subject: FOS: Mathematics

description: We prove a universal property of Deligne's category $\uRep^{ab}(S_d)$. Along the way, we classify tensor ideals in the category $\uRep(S_d)$.
description: 19 pages
Nitrogen fertilization modifies organic transformations and coatings on soil biogeochemical interfaces through microbial polysaccharides synthesis
Creators: name: Huang, Xizhi
name: Guggenberger, Georg
name: Kuzyakov, Yakov
name: Shibistova, Olga
name: Ge, Tida
name: Li, Yiwei
name: Liu, Bifeng
name: Wu, Jinshui
Publisher: name: London : Nature Publishing Group
Year: 2019
Subjects: subject: Nitrogen fertilization
subject: organic transformation
subject: soil biogeochemical interface
subject: soil-water interfaces
subject: SWI
subject: organic matter
subject: Dewey Decimal Classification::500 | Naturwissenschaften
subject: Dewey Decimal Classification::600 | Technik

description: The soil-water interfaces (SWI) in soil pores are hotspots for organic matter (OM) transformation. However, due to the heterogeneous and opaque nature of soil microenvironment, direct and continuous tracing of interfacial reactions, such as OM transformations and formation of organo-mineral associations, are rare. To investigate these processes, a new soil microarray technology (SoilChips) was developed and used. Homogeneous 800-μm-diameter SoilChips were constructed by depositing a dispersed Oxisol A horizon suspension on a patterned glass. Dissolved organic matter from the original soil was added on the SoilChips to mimic SWI processes. The effects of ammonium fertilization (90 mg N kg−1 soil) on chemical composition of SWIs were evaluated via X-ray photoelectron spectroscopy. Over 21 days, ammonium addition increased OM coatings at SWIs and modified the OM chemical structure with more alcoholic- and carboxylic-C compared to the unfertilized control. Molecular modeling of OM composition at SWIs showed that N fertilization mainly facilitated the microbial production of glucans. We demonstrated that N availability modifies the specific OM molecular processing and its immobilization on SWIs, thereby providing a direct insight into biogeochemical transformation of OM at micro-scale. © 2019, The Author(s).
Quasi-inverse endomorphisms
Creators: name: Caranti, A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 20D45, 16N20, 16Y30

description: Greither and Pareigis have established a connection between Hopf Galois structures on a Galois extension $L/K$ with Galois group $G$, and the regular subgroups of the group of permutations on $G$, which are normalized by $G$. Byott has rephrased this connection in terms of certain equivalence classes of injective morphisms of $G$ into the holomorph of the groups $N$ with the same cardinality of $G$. Childs and Corradino have used this theory to construct such Hopf Galois structures, starting from fixed-point-free endomorphisms of $G$ that have abelian images. In this paper we show that a fixed-point-free endomorphism has an abelian image if and only if there is another endomorphism that is its inverse with respect to the circle operation in the near-ring of maps on $G$, and give a fairly explicit recipe for constructing all such endomorphisms.
description: 11 pages. Minor editing for clarity, typos and slips
Bulk viscosity of hot dense Quark matter in PNJL model
Creators: name: Xiao, Shi-Song
name: Zhang, Le
name: Guo, Pan-Pan
name: Hou, Defu
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Starting from the Kubo formula and the the QCD low energy theorem, we study the the bulk viscosity of hot dense quark matter in the PNJL model from the equation of state . We show that the bulk viscosity has a sharp peak near the chiral phase transition, and the ratio of bulk viscosity over entropy rises dramatically in the vicinity of the phase transition. These results agrees with that from lattice and other model calculations. In addition, we show that the increase of chemical potential raises the bulk viscosity.
description: 8 Pages, 3 figures in Latex. arXiv admin note: text overlap with arXiv:1107.5113 by other authors
Improving the Sensory Capabilities of an Electromagnetic Guided Rotary Table for the Use in Machine Tools
Creators: name: Denkena, Berend
name: Brühne, Tilmann
Publisher: name: Amsterdam : Elsevier B.V.
Year: 2016
Subjects: subject: Manufacturing engineering
subject: Engineering
subject: Control engineering
subject: Magnetic bearing
subject: Machining
subject: Machine tool
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: Difficult-to-machine materials are still challenging the production industry. Examples are highly complex components of aircraft engines. Alongside innovative processes, also improved machine tool components are helping to comply with the demands of this task. This paper presents a swivel rotary table with an active magnetic bearing (AMB). Opportunities in machining through employing a workpiece-sided AMB are presented. The inherent capabilities to work as a sensor and actor as well as its stiffness and damping depend on the precise knowledge of the magnets characteristics. Therefore, a methodology to automatically identify the characteristic curve is presented.
Property Optimization for TWIP Steels – Effect of Pre-deformation Temperature on Fatigue Properties
Creators: name: Rüsing, Christian
name: Lambers, H.-G.
name: Lackmann, Jan
name: Frehn, Andreas
name: Nagel, M.
name: Schaper, Mirko
name: Maier, Hans Jürgen
name: Niendorf, T.
Publisher: name: Amsterdam : Elsevier B.V.
Year: 2015
Subjects: subject: Dislocation
subject: Metallurgy
subject: Materials science
subject: Twip
subject: Deformation (mechanics)
subject: Slip (materials science)
subject: Diffusionless transformation
subject: Plasticity
subject: Microstructure
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::600 | Technik::670 | Industrielle und handwerkliche Fertigung

description: The current work investigates the impact of pre-deformation temperatures on the microstructure evolution and the subsequent cyclic stress-strain response of high-manganese steel showing twinning-induced plasticity (TWIP) at room temperature (RT). Deformation at low temperatures increases the hardening rate at low to medium degrees of deformation through concurrent martensitic transformation. In contrast, high temperatures promote dislocation slip. Thus, employing pre-treatments at temperatures below and above RT leads to the evolution of considerably different microstructures. Low-cycle fatigue experiments revealed distinct differences for the pre-treated TWIP steels.
Estimating gas masses and dust-to-gas ratios from optical spectroscopy
Creators: name: Brinchmann, Jarle
name: Charlot, Stéphane
name: Kauffmann, Guinevere
name: Heckman, Tim
name: White, Simon D. M.
name: Tremonti, Christy
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present a method to estimate the total gas column density, dust-to-gas and dust-to-metal ratios of distant galaxies from rest-frame optical spectra. The technique exploits the sensitivity of certain optical lines to changes in depletion of metals onto dust grains and uses photo-ionization models to constrain these physical ratios along with the metallicity (Z) and dust column density. We compare our gas column density estimates with HI and CO gas mass estimates in nearby galaxies to show that we recover their total gas mass surface density to within a factor of 2 up to a total surface gas mass density of ~75 Mo/pc^2. Our technique is independent of the conversion factor of CO to H2 and we show that a Z-dependent XCO is required to achieve good agreement between our measurements and that provided by CO and HI. However we also show that our method can not be reliably aperture corrected to total gas mass. We calculate dust-to-gas ratios for all star-forming galaxies in the SDSS DR7 and show the resulting dependence on Z agrees well with the trend inferred from modelling of the dust emission of nearby galaxies using FIR data. We also present estimates of the variation of the dust-to-metal ratio with Z and show that this is poorly constrained at Z
description: 32 pages, 25 figures. Accepted for MNRAS