cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Uebersicht der in den 20 Jahrgängen unseres Correspondenzblattes vom 21. bis 40. Jahrgang erschienen Aufsätze und Notizen
Creators: name: Clessin, S.
Publisher: name: Acta Albertina Ratisbonensia
Year: 2017

description: Die Uebersicht über die in den ersten 20 Jahren erschienenen Abhandlungen befindet sich im 20. Bande des Correspondenzblattes. I. Allgemeines. 1. Vereinsangelegenheiten. Mitgliederverzeichnis. 28. p 2. „ 30. p. 2—31. p. 2. 2. Naturforscher- Versammlungen. Die 41 Versammlung deutscher Naturforscher und Aerzte in Frankfurt a. M. 1867. 21. p. 130. 146. 3. Reeensionen und Literaturherichte. H. T. Stainton. Natural history of the Tineina. vol. X, Gelechia part, II. 1967 — 21. p. 66. Sars. Fossile Thierreste der Quatärformation 21. p. 71.
description: Acta Albertina Ratisbonensia, Bd. 10 (1905): Berichte des Naturwissenschaftlichen (früher zoologisch - mineralogischen) Vereines zu Regensburg X. Heft für die Jahre 1903 und 1904
Electronic and Magnetic State of LaMnO$_3$ Epitaxially Strained on SrTiO$_3$: Effect of Local Correlation and Non-local Exchange
Creators: name: Banerjee, Hrishit
name: Janson, Oleg
name: Held, Karsten
name: Saha-Dasgupta, Tanusri
Publisher: name: arXiv
Year: 2019
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Motivated by the puzzling report of the observation of a ferromagnetic insulating state in LaMnO$_3$/SrTiO$_3$ heterostructures, we calculate the electronic and magnetic state of LaMnO$_3$, coherently matched to a SrTiO$_3$ square substrate within a "strained-bulk" geometry. We employ three different density functional theory based computational approaches: (a) density functional theory (DFT) supplemented with Hubbard U (DFT+U), (b) DFT + dynamical mean field theory (DMFT), and (c) a hybrid functional treatment of the exchange-correlation functional. While the first two approaches include local correlations and exchange at Mn sites, treated in a static and dynamic manner, respectively, the last one takes into account the effect of non-local exchange at all sites. We find in all three approaches that the compressive strain induced by the square substrate of SrTiO$_3$ turns LaMnO$_3$ from an antiferromagnet with sizable orbital polarization to a ferromagnet with suppressed Jahn-Teller distortion in agreement with experiment. However, while both DFT+U and DFT+DMFT provide a metallic solution, only the hybrid calculations result in an insulating solution, as observed in experiment. This insulating behavior is found to originate from an electronic charge disproportionation. Our conclusions remain valid when we investigate LaMnO$_3$/SrTiO$_3$ within the experimental set-up of a superlattice geometry using DFT+U and hybrid calculations.
description: 10 pages, 7 figures
The Lennard-Jones-Devonshire cell model revisited
Creators: name: Magee, James E.
name: Wilding, Nigel B.
Publisher: name: arXiv
Year: 2001
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We reanalyse the cell theory of Lennard-Jones and Devonshire and find that in addition to the critical point originally reported for the 12-6 potential (and widely quoted in standard textbooks), the model exhibits a further critical point. We show that the latter is actually a more appropriate candidate for liquid-gas criticality than the original critical point.
description: 5 pages, 3 figures, submitted to Mol. Phys
Canthidium persplendens Balthasar 1939
Creators: name: Bezděk, Aleš
name: Hájek, Jiří
name: Ascr, Biology Centre
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scarabaeidae
Canthidium
Canthidium persplendens

description: Canthidium persplendens Balthasar, 1939
 Canthidium persplendens Balthasar, 1939a: 134.
The holotype is deposited in NMPC (ex coll. V. Balthasar):
HOLOTYPE (♀): ‘ Columbia / Pohlke [p, green label] // Typus [p, red label, black margin] // C. persplendens / n. sp. [hw] / Dr. V. Balthasar det [p] // Mus. Nat. Pragae [p] / 26234 [hw] / Inv. [p, orange label] // persplendens m. [hw, green label, black margin]’.
 Current status. Valid species.
description: Published as part of Bezděk, Aleš, Hájek, Jiří & Ascr, Biology Centre, 2012, Catalogue of type specimens of beetles (Coleoptera) deposited in the National Museum, Prague, Czech Republic, pp. 297-334 in Acta Entomologica Musei Nationalis Pragae 52 (1) on page 304, DOI: 10.5281/zenodo.5330401
A DenseNet Based Approach for Multi-Frame In-Loop Filter in HEVC
Creators: name: Li, Tianyi
name: Xu, Mai
name: Yang, Ren
name: Tao, Xiaoming
Publisher: name: arXiv
Year: 2019
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: High efficiency video coding (HEVC) has brought outperforming efficiency for video compression. To reduce the compression artifacts of HEVC, we propose a DenseNet based approach as the in-loop filter of HEVC, which leverages multiple adjacent frames to enhance the quality of each encoded frame. Specifically, the higher-quality frames are found by a reference frame selector (RFS). Then, a deep neural network for multi-frame in-loop filter (named MIF-Net) is developed to enhance the quality of each encoded frame by utilizing the spatial information of this frame and the temporal information of its neighboring higher-quality frames. The MIF-Net is built on the recently developed DenseNet, benefiting from the improved generalization capacity and computational efficiency. Finally, experimental results verify the effectiveness of our multi-frame in-loop filter, outperforming the HM baseline and other state-of-the-art approaches.
description: 10 pages, 4 figures. Accepted by Data Compression Conference 2019
Die Ernährung der Pflanzen
Creators: name: Schüler, N.
Publisher: name: Acta Albertina Ratisbonensia
Year: 2017

description: Vortrag im naturwissenschaftlichen Verein Regensburg Die Stoffe, welche die Pflanze aufnimmt, können wir die Nährstoffe derselben nennen. Indessen bedarf es doch bei diesen Stoffen erst der Entscheidung, ob sie für die Entwicklung der Pflanzen notwendig oder entbehrlich sind, denn es ist nicht ausgeschlossen, dass auch Stoffe in die Pflanze gelangen, die für die Ernährung derselben nicht wesentlich sind. Nur die hiezu unentbehrlichen können wir als echte Nährstoffe ansehen. Um zunächst die chemischen Bestandteile der erwachsenen reifen Pflanze kennen zu lernen, unterscheiden wir an jeder Pflanzensubstanz zwei Hauptbestandteile: Das Wasser und die Trockensubstanz; beide zusammen machen das Gewicht der Pflanze in frischem Zustand aus.
description: Acta Albertina Ratisbonensia, Bd. 10 (1905): Berichte des Naturwissenschaftlichen (früher zoologisch - mineralogischen) Vereines zu Regensburg X. Heft für die Jahre 1903 und 1904
Instanton sheaves and representations of quivers
Creators: name: Jardim, Marcos
name: da Silva, Danilo D.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics

description: We study the moduli space of rank 2 instanton sheaves on $\p3$ in terms of representations of a quiver consisting of 3 vertices and 4 arrows between two pairs of vertices. Aiming at an alternative compactification for the moduli space of instanton sheaves, we show that for each rank 2 instanton sheaf, there is a stability parameter $θ$ for which the corresponding quiver representation is $θ$-stable (in the sense of King), and that the space of stability parameters has a non trivial wall-and-chamber decomposition. Looking more closely at instantons of low charge, we prove that there are stability parameters with respect to which every representation corresponding to a rank 2 instanton sheaf of charge 2 is stable, and provide a complete description of the wall-and-chamber decomposition for representation corresponding to a rank 2 instanton sheaf of charge 1.
description: 17 pages, 1 figure
An Elementary Proof of Lyapunov Exponent Pairing for Hard-Sphere Systems at Constant Kinetic Energy
Creators: name: Panja, Debabrata
Publisher: name: arXiv
Year: 2001
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The conjugate pairing of Lyapunov exponents for a field-driven system with smooth inter-particle interaction at constant total kinetic energy was first proved by Dettmann and Morriss [Phys. Rev. E {\bf 53}, R5545 (1996)] using simple methods of geometry. Their proof was extended to systems interacting via hard-core inter-particle potentials by Wojtkowski and Liverani [Comm. Math. Phys. {\bf 194}, 47 (1998)], using more sophisticated methods. Another, and somewhat more direct version of the proof for hard-sphere systems has been provided by Ruelle [J. Stat. Phys. {\bf 95}, 393 (1999)]. However, these approaches for hard-sphere systems are somewhat difficult to follow. In this paper, a proof of the pairing of Lyapunov exponents for hard-sphere systems at constant kinetic energy is presented, based on a very simple explicit geometric construction, similar to that of Ruelle. Generalizations of this construction to higher dimensions and arbitrary shapes of scatterers or particles are trivial. This construction also works for hard-sphere systems in an external field with a Nosé-Hoover thermostat. However, there are situations of physical interest, where these proofs of conjugate pairing rule for systems interacting via hard-core inter-particle potentials break down.
description: 16 pages, 4 figures, to appear in J. Stat. Phys
Pycnogonida Latreille 1810
Creators: name: Lamsdell, James C.
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Pycnogonida

description: PYCNOGONIDA LATREILLE, 1810 [= ARACHNOPODA DANA, 1853]   Diagnosis: Chelicerata with all body segments retaining dorsal differentiation; external proboboscis developed around mouth; appendage III modified into ovigers; abdomen generally reduced.
description: Published as part of Lamsdell, James C., 2013, Revised systematics of Palaeozoic ' horseshoe crabs' and the myth of monophyletic Xiphosura, pp. 1-27 in Zoological Journal of the Linnean Society 167 (1) on page 19, DOI: 10.1111/j.1096-3642.2012.00874.x, http://zenodo.org/record/5292231
Der Pflanzen Durst
Creators: name: Familler, Jg.
Publisher: name: Acta Albertina Ratisbonensia
Year: 2017

description: Vortrag- am 26. Oktober 1903 „Man spricht vom vielen Trinken stets, doch nicht vom steten Durste.“ So ungefähr lässt ein weinfroher Schwabendichter eine stets durstige Ritterseele sich über das missbilligende Urteil der Mitwelt beklagen. Und ähnlich vermeine ich, könnte so mancher sogenannte Blumenstock klagen, wenn er hören muss, wie sein Herr und Pfleger jammert „habe ich doch erst gestern all meine Pflanzen begossen und heute ist schon wieder Alles trocken und hängt das Köpfchen.“ Wasser und Licht sind eben die beiden Hauptfaktoren im Leben der Pflanze, so dass bei völligem Ausschlüsse des einen oder anderen die sogenannte höhere Pflanze stirbt. Ich muss nämlich bei der folgenden Erörterung die niederen Pflanzenformen, als da sind Allgen, Pilze, Moose und die etwaigen Ausnahmen der höheren Pflanzen grösstenteils beiseite lassen, um ihre Geduld nicht allzulange zu erproben.
description: Acta Albertina Ratisbonensia, Bd. 10 (1905): Berichte des Naturwissenschaftlichen (früher zoologisch - mineralogischen) Vereines zu Regensburg X. Heft für die Jahre 1903 und 1904
SAMPL6 Part II Partition Coefficient Challenge Overview
Creators: name: Işık, Mehtap
Publisher: name: Zenodo
Year: 2019
Subjects: computational chemistry
SAMPL
blind prediction challenge
partition coefficient
free energy calculations
physicochemical property prediction
SAMPL6

description: This presentation was given at the Joint D3R/SAMPL Workshop 2019 in San Diego, CA on August 22nd, 2019. It covers an overview of SAMPL6 logP Blind Prediction Challenge, experimental data collection, challenge structure, and performance evaluation of blind logP predictions.
 https://drugdesigndata.org/about/d3r-2019-workshop
On separable Pauli equations
Creators: name: Zhalij, Alexander
Publisher: name: arXiv
Year: 2002
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences
subject: 35Q40, 81Q05

description: We classify (1+3)-dimensional Pauli equations for a spin-1/2 particle interacting with the electro-magnetic field, that are solvable by the method of separation of variables. As a result, we obtain the eleven classes of vector-potentials of the electro-magnetic field A(t,x) providing separability of the corresponding Pauli equations. It is established, in particular, that the necessary condition for the Pauli equation to be separable into second-order matrix ordinary differential equations is its equivalence to the system of two uncoupled Schroedinger equations. In addition, the magnetic field has to be independent of spatial variables. We prove that coordinate systems and the vector-potentials of the electro-magnetic field providing the separability of the corresponding Pauli equations coincide with those for the Schroedinger equations. Furthermore, an efficient algorithm for constructing all coordinate systems providing the separability of Pauli equation with a fixed vector-potential of the electro-magnetic field is developed. Finally, we describe all vector-potentials A(t,x) that (a) provide the separability of Pauli equation, (b) satisfy vacuum Maxwell equations without currents, and (c) describe non-zero magnetic field.
description: 29 pages, LaTeX
Eine alpine Schnecke bei Donaustauf
Creators: name: Clessin, S.
Publisher: name: Acta Albertina Ratisbonensia
Year: 2017

description: Vor ca. 50 Jahren hat der in Donaustauf wohnende Malakozoologe Pfarrer Sterr an der Burgruine Stauf Helix (Campylaea) foetens Rossm., die er von den Alpen mitgebracht hatte, angesiedelt. Bei einem kürzlichen Besuch der Ruine fand ich an der Stelle ihrer Ansiedlung 4 lebende Exemplare derselben. Zwei hatten im Vorjahre ihre Gehäuse vollendet, eines aber erst im laufenden Frühling. Das vierte war erst halb erwachsen. Ausserdem fielen mir noch 2 gut erhaltene leere Gehäuse in die Hände; die Art hat sich demnach an der Ansiedlungsstelle fortgepflanzt. Sie bewohnt einen höchstens 40 qm grossen Raum in dichtem Gebüsch und lagen die Schnecken bei dem trockenen Wetter unter einer sehr dichten Mulmschichte.
description: Acta Albertina Ratisbonensia, Bd. 10 (1905): Berichte des Naturwissenschaftlichen (früher zoologisch - mineralogischen) Vereines zu Regensburg X. Heft für die Jahre 1903 und 1904
Discrete breathers in dissipative lattices
Creators: name: Marin, J. L.
name: Falo, F.
name: Martinez, P. J.
name: Floria, L. M.
Publisher: name: arXiv
Year: 2001
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: Condensed Matter (cond-mat)
subject: FOS: Physical sciences

description: We study the properties of discrete breathers, also known as intrinsic localized modes, in the one-dimensional Frenkel-Kontorova lattice of oscillators subject to damping and external force. The system is studied in the whole range of values of the coupling parameter, from C=0 (uncoupled limit) up to values close to the continuum limit (forced and damped sine-Gordon model). As this parameter is varied, the existence of different bifurcations is investigated numerically. Using Floquet spectral analysis, we give a complete characterization of the most relevant bifurcations, and we find (spatial) symmetry-breaking bifurcations which are linked to breather mobility, just as it was found in Hamiltonian systems by other authors. In this way moving breathers are shown to exist even at remarkably high levels of discreteness. We study mobile breathers and characterize them in terms of the phonon radiation they emit, which explains successfully the way in which they interact. For instance, it is possible to form ``bound states'' of moving breathers, through the interaction of their phonon tails. Over all, both stationary and moving breathers are found to be generic localized states over large values of $C$, and they are shown to be robust against low temperature fluctuations.
description: To be published in Physical Review E
Eine altaluviale Conchylienfauna bei Pürklgut
Creators: name: Clessin, S.
Publisher: name: Acta Albertina Ratisbonensia
Year: 2017

description: I. Auf den Wiesen zwischen Pürklgut und Burgweinting wühlen Maulwürfe schwarze Erdhaufen auf, die mit weissen Punkten besät sind. Bei näherer Untersuchung erweisen sich die Punkte als abgebleichte Conclndienschalen. Die Mündungen dieser Schalen sind mit einer weissgrauen Erde gefüllt. Die Conchylien liegen daher nicht in der moorigen schwarzen Erde, welche die oberste Schichte der Wiesen bildet, sondern in einer tieferliegenden, die gerade noch von den wühlenden Maulwürfen erreicht werden kann. Die moorige Erde enthält keine Molluskenschalen, weil die Humussäure den Kalk zersetzt und die Schalen zerstört. — Diese weissgraue Schichte stellt den Boden eines ehemaligen Seebeckens dar, welches eine ziemlich beträchtliche Ausdehnung hatte, das aber allmählich versumpft ist und sich in einen Moorbruch verwandelt hat, bis derselbe in Cultur genommen, das Wasser abgeleitet und nutzbare Wiesen geschahen wurden.
description: Acta Albertina Ratisbonensia, Bd. 10 (1905): Berichte des Naturwissenschaftlichen (früher zoologisch - mineralogischen) Vereines zu Regensburg X. Heft für die Jahre 1903 und 1904
Canthidium pinotoides Balthasar 1939
Creators: name: Bezděk, Aleš
name: Hájek, Jiří
name: Ascr, Biology Centre
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scarabaeidae
Canthidium
Canthidium pinotoides

description: Canthidium pinotoides Balthasar, 1939
 Canthidium pinotoides Balthasar, 1939a: 135.
The holotype is deposited in NMPC (ex coll. V. Balthasar):
HOLOTYPE (♀): ‘ San Bernardino / A. Fischer S. G. / V. 1913 [p] // Typus [p, red label] // Canthidium / pinotoides m. [hw] / Dr. V. Balthasar det. [p] // pinotoides m. [hw, green label, black margin]’.
 Current status. Canthidium (Canthidium) pinotoides Balthasar, 1939, see MARTÍNEZ &
HALFFTER (1986).
description: Published as part of Bezděk, Aleš, Hájek, Jiří & Ascr, Biology Centre, 2012, Catalogue of type specimens of beetles (Coleoptera) deposited in the National Museum, Prague, Czech Republic, pp. 297-334 in Acta Entomologica Musei Nationalis Pragae 52 (1) on page 304, DOI: 10.5281/zenodo.5330401
Frictional coupling between sliding and spinning motion
Creators: name: Farkas, Zeno
name: Bartels, Guido
name: Unger, Tamas
name: Wolf, Dietrich E.
Publisher: name: arXiv
Year: 2002
Subjects: subject: Classical Physics (physics.class-ph)
subject: Condensed Matter (cond-mat)
subject: FOS: Physical sciences

description: We show that the friction force and torque, acting at a dry contact of two objects moving and rotating relative to each other, are inherently coupled. As a simple test system, a sliding and spinning disk on a horizontal flat surface is considered. We calculate, and also measure, how the disk is slowing down, and find that it always stops its sliding and spinning motion at the same moment. We discuss the impact of this coupling between friction force and torque on the physics of granular materials.
description: 4 pages, 5 figures; submitted
Fluctuation-dissipation relations and effective temperatures in simple non-mean field systems
Creators: name: Sollich, P
name: Fielding, S
name: Mayer, P
Publisher: name: arXiv
Year: 2001
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We give a brief review of violations of the fluctuation-dissipation theorem (FDT) in out-of-equilibrium systems; in mean field scenarios the corresponding fluctuation-dissipation (FD) plots can, in the limit of long times, be used to define a {\em effective temperature} $\teff$ that shares many properties of the true thermodynamic temperature $T$. We discuss carefully how correlation and response functions need to be represented to obtain meaningful limiting FD plots in {\em non-mean field} systems. A minimum requirement on the resulting effective temperatures is that they should be independent of the observable whose correlator and response are being considered; we show for two simple models with glassy dynamics (Bouchaud's trap model and the Glauber-Ising chain at zero temperature) that this is generically not the case. Consequences for the wider applicability of effective temperatures derived from FD relations are discussed; one intriguing possibility is that at least the limit of the FDT violation factor for well separated times may generically be observable-independent and so could yield a meaningful $\teff$.
description: 16 pages, IOP style (style files included); to appear in special issue of Journal of Physics: Condensed Matter
Additional file 7: of Modulation of Wnt/BMP pathways during corneal differentiation of hPSC maintains ABCG2-positive LSC population that demonstrates increased regenerative potential
Creators: name: Vattulainen, Meri
name: Ilmarinen, Tanja
name: Koivusalo, Laura
name: Viiri, Keijo
name: Hongisto, Heidi
name: Skottman, Heli
Publisher: name: figshare
Year: 2019
Subjects: subject: Biochemistry
subject: Medicine
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Evolutionary Biology
subject: 69999 Biological Sciences not elsewhere classified
subject: Developmental Biology
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: Computational Biology

description: Figure S4. (A) Additional characterization of OCT3/4, PAX6, CK14, and CK15 expression at d24 in the novel CnT-07+ENRC maintenance condition. (B) Characterization of Ki67/ABCG2 protein expression at d11, as well as after continued culture in CnT-07+ENRC or CnT-30 at d21. In both panels, cell nuclei counterstained with DAPI (blue) and scale bars, 100â Îźm. Data are presented for the hESC lines Regea11/013 (A) and Regea08/017 (B). (DOCX 5938 kb)
One- and two-dimensional solitons in saturable media
Creators: name: Gisin, Boris V.
name: Malomed, Boris A.
Publisher: name: arXiv
Year: 2001
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: Very narrow spatial bright solitons in (1+1)D and (2+1)D versions of cubic-quintic and full saturable models are studied, starting from the full system of the Maxwell's equations, rather than from the paraxial (NLS) approximation. For the solitons with both TE and TM polarizations, it is shown that there always exists a finite minimum width, and they cease to exist at a critical value of the propagation constant, at which their width diverges. Full similarity of the results obtained for both nonlinearities suggests that the same general conclusions apply to narrow solitons in any non-Kerr model.
description: Text latex file and four pdf files with figures. J. Opt. Soc. America B, in press
Die Conchylien des "Löss" der Umgebung Regensburg
Creators: name: Clessin, S.
Publisher: name: Acta Albertina Ratisbonensia
Year: 2017

description: Benützte Werke und Abhandlungen: 1. A. Andreae: Der Diluvialsand von Hangen bieten im Unter- elsass. — Abhandl. d. geolog. Spezialkarte von Elsass-Lothringen IV. Bd. 1884. 2. 0. Böltger: Die Entwicklung der Pupaarten in Raum und Zeit. — Jahrb. des Nassauischen Vereins für Naturkunde in Wiesbaden 1889. 3. Ch. Brömme: Die Conchylien des Moosbacher Diluvial - Sandes. — Jahrb. d. Vereins für Naturkunde in Wiesbaden 1885. 4. — — Der Tallöss bei Schierstein; ebenda 1885. p. 79. 5. S. Clessin: Deutsche Excursions-Mollusken-Fauna 2. Aufl Nürnberg 1874. 6. — — Mollusken-Fauna Oesterreich-Ungarns und der Schweiz. Nürnberg 1887.
description: Acta Albertina Ratisbonensia, Bd. 10 (1905): Berichte des Naturwissenschaftlichen (früher zoologisch - mineralogischen) Vereines zu Regensburg X. Heft für die Jahre 1903 und 1904
Complex Golay Pairs up to Length 28: A Search via Computer Algebra and Programmatic SAT
Creators: name: Bright, Curtis
name: Kotsireas, Ilias
name: Heinle, Albert
name: Ganesh, Vijay
Publisher: name: arXiv
Year: 2019
Subjects: subject: Symbolic Computation (cs.SC)
subject: Logic in Computer Science (cs.LO)
subject: Combinatorics (math.CO)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: We use techniques from the fields of computer algebra and satisfiability checking to develop a new algorithm to search for complex Golay pairs. We implement this algorithm and use it to perform a complete search for complex Golay pairs of lengths up to 28. In doing so, we find that complex Golay pairs exist in the lengths 24 and 26 but do not exist in the lengths 23, 25, 27, and 28. This independently verifies work done by F. Fiedler in 2013 and confirms the 2002 conjecture of Craigen, Holzmann, and Kharaghani that complex Golay pairs of length 23 don't exist. Our algorithm is based on the recently proposed SAT+CAS paradigm of combining SAT solvers with computer algebra systems to efficiently search large spaces specified by both algebraic and logical constraints. The algorithm has two stages: first, a fine-tuned computer program uses functionality from computer algebra systems and numerical libraries to construct a list containing every sequence which could appear as the first sequence in a complex Golay pair up to equivalence. Second, a programmatic SAT solver constructs every sequence (if any) that pair off with the sequences constructed in the first stage to form a complex Golay pair. This extends work originally presented at the International Symposium on Symbolic and Algebraic Computation (ISSAC) in 2018; we discuss and implement several improvements to our algorithm that enabled us to improve the efficiency of the search and increase the maximum length we search from length 25 to 28.
description: Extended version of arXiv:1805.05488, to appear in the Journal of Symbolic Computation
Tertiärpflanzen von Pressat in der Oberpfalz
Creators: name: Engelhardt, H.
Publisher: name: Acta Albertina Ratisbonensia
Year: 2017

description: Zu der grossen Anzahl bisher bekannt gewordener Fundstätten tertiärer Pflanzen Deutschlands hat sich in jüngster Zeit eine neue gesellt. Jm Norden der Oberpfalz Bayerns in der Nähe von Pressat sind in einem Tonlager fossile Pflanzenreste gefunden worden, welche geeignet erscheinen, uns über das Alter der in dortiger Gegend sehr verbreiteten tertiären Ablagerungen Aufschluss zu erteilen. Herr Hofrat Dr. Brunhuber hatte die Güte, mir die im Besitze des naturwissenschaftlichen Vereines befindlichen Stücke zur Bestimmung zu überweisen und zögere ich nicht, eine Notiz über dieselben zu geben, damit das Sammeln weiterer unsere Kenntnis von der in dieser Lokalität eingebetteten Flora vergrössern helfe.
description: Acta Albertina Ratisbonensia, Bd. 10 (1905): Berichte des Naturwissenschaftlichen (früher zoologisch - mineralogischen) Vereines zu Regensburg X. Heft für die Jahre 1903 und 1904
Systematic Design of Antireflection Coating for Semi-infinite One-dimensional Photonic Crystals Using Bloch Wave Expansion
Creators: name: Ushida, Jun
name: Tokushima, Masatoshi
name: Shirane, Masayuki
name: Yamada, Hirohito
Publisher: name: arXiv
Year: 2002
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We present a systematic method for designing a perfect antireflection coating (ARC) for a semi-infinite one-dimensional (1D) photonic crystal (PC) with an arbitrary unit cell. We use Bloch wave expansion and time reversal symmetry, which leads exactly to analytic formulas of structural parameters for the ARC and renormalized Fresnel coefficients of the PC. Surface immittance (admittance and impedance) matching plays an essential role in designing the ARC of 1D PC's, which is shown together with a practical example.
description: This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics
Einläufe zur Bibliothek 1903/04
Creators: name: N., N
Publisher: name: Acta Albertina Ratisbonensia
Year: 2017

description: Einläufe zur Bibliothek 1903104. Von gelehrten Gesellschaften. a) Europa. 1. Deutschland. Aschaifenburg. Naturwissenschaftlicher Verein 4. Mitteil. Jubiläumsfestschrift Augsburg. 36. Bericht des naturwissenschaftlichen Vereines für Schwaben und Neuburg. 1904. Bamberg, XVIII. Bericht der naturforschenden Gesellschaft. 1897—1901. Berlin. Zeitschrift der deutschen geologischen Gesellschaft 1902 I—IV. 1903 I—IV. 1904 I. Register B. 1—50. — Königl. geologische Landesanstalt und Bergakademie. Jahrbuch für das Jahr 1901. Bonn. Verhandlungen des naturhistorischen Vereins der preus-sischen Rheinlande und Westfalens. 60. Jahrgang 1. 2. 61. Jahrgang 1.
description: Acta Albertina Ratisbonensia, Bd. 10 (1905): Berichte des Naturwissenschaftlichen (früher zoologisch - mineralogischen) Vereines zu Regensburg X. Heft für die Jahre 1903 und 1904
Additional file 2: of Germline and somatic mutations in patients with multiple primary melanomas: a next generation sequencing study
Creators: name: Casula, Milena
name: Paliogiannis, Panagiotis
name: Ayala, Fabrizio
name: Giorgi, Vincenzo
name: Stanganelli, Ignazio
name: MandalĂ, Mario
name: Colombino, Maria
name: Manca, Antonella
name: Sini, Maria
name: CaracĂ˛, Corrado
name: Ascierto, Paolo
name: Satta, Rosanna
name: Lissia, Amelia
name: Cossu, Antonio
name: Palmieri, Giuseppe
Publisher: name: figshare
Year: 2019
Subjects: subject: Space Science
subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Genetics
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: 60506 Virology

description: Table S2. The 73 somatic variants found in our study, in detail. In bold, variants classified as pathogenic/likely pathogenic mutations. (PDF 76 kb)
Ausschussmitglieder für 1905
Creators: name: N., N.
Publisher: name: Acta Albertina Ratisbonensia
Year: 2017

description: Vorstand: Hofrat Dr. Brunhuber. Sekretär: Gymnasialprofessor Lagally. Kassier: Dr. Herrich-Schaeffer. Bibliothekar: Gymnasialprofessor Petzi. Custoden: Apotheker Daubert. Oberlehrer Mayer. Dr. Roscher. Vergolder Schreiber.
description: Acta Albertina Ratisbonensia, Bd. 10 (1905): Berichte des Naturwissenschaftlichen (früher zoologisch - mineralogischen) Vereines zu Regensburg X. Heft für die Jahre 1903 und 1904
Xiphosurida Latreille 1802
Creators: name: Lamsdell, James C.
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Merostomata
Xiphosurida

description: XIPHOSURIDA LATREILLE, 1802   Diagnosis: Xiphosura with the tergites of somites VIII–XIV dorsally fused into a thoracetron.
description: Published as part of Lamsdell, James C., 2013, Revised systematics of Palaeozoic ' horseshoe crabs' and the myth of monophyletic Xiphosura, pp. 1-27 in Zoological Journal of the Linnean Society 167 (1) on page 20, DOI: 10.1111/j.1096-3642.2012.00874.x, http://zenodo.org/record/5292231
Polarization-Correlated Photon Pairs from a Single Quantum Dot
Creators: name: Santori, Charles
name: Fattal, David
name: Pelton, Matthew
name: Solomon, Glenn S.
name: Yamamoto, Yoshihisa
Publisher: name: arXiv
Year: 2001
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Polarization correlation in a linear basis, but not entanglement, is observed between the biexciton and single-exciton photons emitted by a single InAs quantum dot in a two-photon cascade. The results are well described quantitatively by a probabilistic model that includes two decay paths for a biexciton through a non-degenerate pair of one-exciton states, with the polarization of the emitted photons depending on the decay path. The results show that spin non-degeneracy due to quantum-dot asymmetry is a significant obstacle to the realization of an entangled-photon generation device.
description: 4 pages, 4 figures, revised discussion
Additional file 6: of Modulation of Wnt/BMP pathways during corneal differentiation of hPSC maintains ABCG2-positive LSC population that demonstrates increased regenerative potential
Creators: name: Vattulainen, Meri
name: Ilmarinen, Tanja
name: Koivusalo, Laura
name: Viiri, Keijo
name: Hongisto, Heidi
name: Skottman, Heli
Publisher: name: figshare
Year: 2019
Subjects: subject: Space Science
subject: Cell Biology
subject: Biotechnology
subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: Developmental Biology
subject: Computational Biology

description: Table S2. Distribution of ABCG2-positive and ABCG2-negative cells in Regea08/017 d10 hPSC-LSC subpopulations marked by selected cell surface markers. (DOCX 19 kb)
Canthidium pseudaurifex Balthasar 1939
Creators: name: Bezděk, Aleš
name: Hájek, Jiří
name: Ascr, Biology Centre
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scarabaeidae
Canthidium
Canthidium pseudaurifex

description: Canthidium pseudaurifex Balthasar, 1939
 Canthidium pseudaurifex Balthasar, 1939a: 136.
The holotype is deposited in NMPC (ex coll. V. Balthasar): HOLOTYPE (J): ‘Babahoyo / 7. 05 O. v. B. [p] // Typus [p, red label, black margin] // C. pseudaurifex n. sp. [hw] /
Dr. V. Balthasar det. [p] // pseudaurifex m. [hw, green label, black margin]’.
 Current status. Valid species.
description: Published as part of Bezděk, Aleš, Hájek, Jiří & Ascr, Biology Centre, 2012, Catalogue of type specimens of beetles (Coleoptera) deposited in the National Museum, Prague, Czech Republic, pp. 297-334 in Acta Entomologica Musei Nationalis Pragae 52 (1) on page 304, DOI: 10.5281/zenodo.5330401
Mitglieder-Verzeichnis
Creators: name: N., N.
Publisher: name: Acta Albertina Ratisbonensia
Year: 2017

description: I. Mai 1905. Ehrenmitglieder. Se. Durchlaucht Fürst Albert von Thurn und Taxis. Hr. Professor Dr. von Amnion, k. Oberbergrat in München. „ A. Clessin, k. Bahninspektor a. D. in Regensburg. „ Professor Dr. Engelhardt in Dresden. „ P. Vinzenz Gredler, Gymnasialdirektor in Bozen. „ Dr. von Heyden, k. Major z. D. in Bockenheim. „ Professor Dr. Oebbeke an der technischen Hochschule in München. „ Professor Dr. Pompeckj in Hohenheim. „ Dr. Roger, k. Kreismedizinalrat in Augsburg. „ Apotheker Dr. Schmidt in Wunsiedel. „ Professor Dr. Weinschenk in München. „ Winneberger, k. Generalmajor z. D. in München. Korrespondierende Mitglieder. Hr. Brusina Spir., Direktor in Agram. „ Dr. L. Koch in Nürnberg. „ Kittel, Lycealprofessor in Passau. „ Lefebre in Brüssel. „ H. Stölir, Redakteur in Dresden. In Regensburg und Stadtamhof wohnende Mitglieder. Hr. Dr. Adam, Assistenzarzt Karthaus. „ v. Aretin Freiherr, fürstl. Th. u. T. Geheimrat.
description: Acta Albertina Ratisbonensia, Bd. 10 (1905): Berichte des Naturwissenschaftlichen (früher zoologisch - mineralogischen) Vereines zu Regensburg X. Heft für die Jahre 1903 und 1904
Chasmataspidida Caster & Brooks 1956
Creators: name: Lamsdell, James C.
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Chasmataspidida

description: CHASMATASPIDIDA CASTER & BROOKS, 1956 [= DIPLOASPIDA SIMONETTA & DELLE CAVE, 1978]   Diagnosis: Dekatriata with the tergite of somite VII retained as a dorsally visible microtergite; tergites of somites VII–X dorsally fused into a buckler; buckler underlain by ventral plate.
description: Published as part of Lamsdell, James C., 2013, Revised systematics of Palaeozoic ' horseshoe crabs' and the myth of monophyletic Xiphosura, pp. 1-27 in Zoological Journal of the Linnean Society 167 (1) on page 20, DOI: 10.1111/j.1096-3642.2012.00874.x, http://zenodo.org/record/5292231
Eurypterida BURMEISTER 1843
Creators: name: Lamsdell, James C.
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Eurypterida

description: EURYPTERIDA BURMEISTER, 1843 [= GIGANTOSTRACA HAECKEL, 1866] [= CYRTOCTENIDA STØRMER & WATERSTON, 1968]   Diagnosis: Sclerophorata with the appendages of somites VIII and IX fused into a genital operculum.
description: Published as part of Lamsdell, James C., 2013, Revised systematics of Palaeozoic ' horseshoe crabs' and the myth of monophyletic Xiphosura, pp. 1-27 in Zoological Journal of the Linnean Society 167 (1) on page 21, DOI: 10.1111/j.1096-3642.2012.00874.x, http://zenodo.org/record/5292231
3D metamaterial with stiffness and Poisson's ratio approaching negative infinity
Creators: name: Jia, Zian
name: Wang, Lifeng
Publisher: name: arXiv
Year: 2019
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: We report a three-dimensional mechanical metamaterial that simultaneously possesses negative stiffness, negative bulk modulus, and negative Poisson's ratio. This metamaterial is a periodic arrangement of binder-shell elements. Under compression, the spherical shells dent inwards which cause the material to contract in the lateral directions. At larger deformations, snap through instability occurs and the material exhibits negative incremental stiffness. Interestingly, both incremental stiffness and incremental Poisson's ratio approach negative infinity (under displacement control) when snap-back is observed. We further showed that the multi-negative index metamaterial satisfies the strong ellipticity condition, therefore, a block of the metamaterial with many unit cells is stable under displacement constraint.
description: 6 pages, 4 figures
Rechnungsabschluss für das Jahr 1904
Creators: name: Herrich-Schaeffer, N.
Publisher: name: Acta Albertina Ratisbonensia
Year: 2017

description: Einnahmen. Mitgliederbeiträge a. von hiesigen . . 1113 M. — dl. b. von auswärtigen 114 77 — 77 Aufhahmsgebüliren .... 12 77 — 7 Mietzinsbeitrag vom Stadtmagistrat 550 n — 7 Zuschuss vom Landrat der Oberptälz . Von Sr. Durchlaucht dem Fürsten 300 77 77 von Thurn und Taxis 100 77 — 77 Zinsen ...... 101 77 70 n Zufällige Einnahmen .... 4 ?7 — 77 Summa der Einnahmen 2294 M 70 dl. Ausgaben.
description: Acta Albertina Ratisbonensia, Bd. 10 (1905): Berichte des Naturwissenschaftlichen (früher zoologisch - mineralogischen) Vereines zu Regensburg X. Heft für die Jahre 1903 und 1904
Coherent states for arbitrary Lie group
Creators: name: Perelomov, A. M.
Publisher: name: arXiv
Year: 2002
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The concept of coherent states originally closely related to the nilpotent group of Weyl is generalized to arbitrary Lie group. For the simplest Lie groups the system of coherent states is constructed and its features are investigated.
description: an old paper (1972) posted for archival purposes
Rechnungsabschluss für das Jahr 1903
Creators: name: N., N.
Publisher: name: Acta Albertina Ratisbonensia
Year: 2017

description: Einnahmen: Aktivrest aus dem Vorjahre . 153 M. 90 dl. Mitgliederbeiträge a. von hiesigen .... 965 „ - „ b. von auswärtigen 192 „ - „ Aufnahmsgebühren .... 22 „ — „ Mietzinsbeitrag vom Stadtmagistrate 550 „ - r Zuschuss vom Landrat der Oberpfalz 300 „ - „ Von Sr. Durchlaucht dem Fürsten von Thurn und Taxis lOO „ „ Zinsen ... . . 184 „ 50 „ Zufällige Einnahmen .... 38 „ 98 „ Summa der Einnahmen 2506 M. 38 dl. Ausgaben:
description: Acta Albertina Ratisbonensia, Bd. 10 (1905): Berichte des Naturwissenschaftlichen (früher zoologisch - mineralogischen) Vereines zu Regensburg X. Heft für die Jahre 1903 und 1904
Bericht des naturwissenschaftlichen Vereines in Regensburg für die Jahre 1903 und 1904
Creators: name: N., N.
Publisher: name: Acta Albertina Ratisbonensia
Year: 2017

description: Die Tätigkeit des Vereines in diesem Jahre war eine rege und vielseitige. Vereins Versammlungen mit Vorträgen wurden während der Wintermonate im ganzen 7 abgehalten. 26. Jan.: Vortrag des Herrn Professors Wankel: „Die Hygiene des Wohnhauses“. 16. Febr.: Vortrag des Herrn Professors Lindner: „Eine Wanderung durch das Reich der Gestirne“. (Mit Projektionsbildern) 23. März: Vortrag des Herrn Professors Lagally: „Ueber Schutzfarben der Fische“. 28. April: Vortrag des Herrn Oberarztes Dr. Hing: „Feber Verdauung“. 26. Okt : Vortrag des Herrn Dr. Familler: „Der Pflanzendurst“
description: Acta Albertina Ratisbonensia, Bd. 10 (1905): Berichte des Naturwissenschaftlichen (früher zoologisch - mineralogischen) Vereines zu Regensburg X. Heft für die Jahre 1903 und 1904
Tail models and the statistical limit of accuracy in risk assessment
Creators: name: Hoffmann, Ingo
name: Börner, Christoph J.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Risk Management (q-fin.RM)
subject: Methodology (stat.ME)
subject: FOS: Economics and business
subject: FOS: Computer and information sciences
subject: 62F10, 62E20

description: In risk management, tail risks are of crucial importance. The assessment of risks should be carried out in accordance with the regulatory authority's requirement at high quantiles. In general, the underlying distribution function is unknown, the database is sparse, and therefore special tail models are used. Very often, the generalized Pareto distribution is employed as a basic model, and its parameters are determined with data from the tail area. With the determined tail model, statisticians then calculate the required high quantiles. In this context, we consider the possible accuracy of the calculation of the quantiles and determine the finite sample distribution function of the quantile estimator, depending on the confidence level and the parameters of the tail model, and then calculate the finite sample bias and the finite sample variance of the quantile estimator. Finally, we present an impact analysis on the quantiles of an unknown distribution function.
description: 3 figures
Canthidium seladon Balthasar 1939
Creators: name: Bezděk, Aleš
name: Hájek, Jiří
name: Ascr, Biology Centre
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scarabaeidae
Canthidium
Canthidium seladon

description: Canthidium seladon Balthasar, 1939
 Canthidium seladon Balthasar, 1939a: 137.
The holotype is deposited in NMPC (ex coll. V. Balthasar):
HOLOTYPE (J): ‘ ARGENTINA / S. d. Cordoba / J. Hubrich S. [p] // Typus [p, red label, black margin] // C. seladon / n. sp. m. [hw] / Dr. V. Balthasar det [p] // seladon m. [hw, green label, black margin]’.
 Current status. Canthidium (Canthidium) seladon Balthasar, 1939, see MARTÍNEZ & HALFF-
TER (1986).
description: Published as part of Bezděk, Aleš, Hájek, Jiří & Ascr, Biology Centre, 2012, Catalogue of type specimens of beetles (Coleoptera) deposited in the National Museum, Prague, Czech Republic, pp. 297-334 in Acta Entomologica Musei Nationalis Pragae 52 (1) on page 304, DOI: 10.5281/zenodo.5330401
Arachnida Lamarck 1801
Creators: name: Lamsdell, James C.
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida

description: ARACHNIDA LAMARCK, 1801   Diagnosis: Sclerophorata with reduced head shield lacking cardiac lobe; anteroventrally directed mouth; proventricular crop lost; adult instars without appendages of the first opisthosomal segment.
 Remarks: A monophyletic Arachnida is one of the most strongly supported clades within the analysis, even without characters traditionally considered to unite the group that have been suggested to represent convergences towards a terrestrial mode of life (Dunlop & Webster, 1999). Dunlop et al. (2012) recently reviewed the cephalic tagmosis in solifuges, acariformes, schizomids, and palpigrades, which have the prosoma separated anteriorly into a propeltidium consisting of the first four appendage pairs, that they suggested may be homologous to the ‘euarthropod head’ (see Chen, 2009). Dunlop et al. suggest that a divided prosomal region consisting of a propeltidium and two separate segments bearing walking limbs may be plesiomorphic for arachnids. This would, however, necessitate a separate acquisition of the prosoma in each of the aquatic euchelicerate groups. The solifuge Galeodes armeniacus Birula, 1929 was included in the current analysis with its head composition coded polymorphically as both 1 + 3 and 1 + 5, representing the fact that it possesses a propeltidium as a subdivision of the prosoma. The results, however, show that the plesiomorphic condition for arachnids is a fully consolidated prosoma, and the division into propeltidium is a derived state (or possibly a reversal). Alternatively coding G. armeniacus as only possessing a 1 + 3 head did not change the tree topology, or the arachnid ground plan, in any way.
description: Published as part of Lamsdell, James C., 2013, Revised systematics of Palaeozoic ' horseshoe crabs' and the myth of monophyletic Xiphosura, pp. 1-27 in Zoological Journal of the Linnean Society 167 (1) on page 21, DOI: 10.1111/j.1096-3642.2012.00874.x, http://zenodo.org/record/5292231
Discrete dynamical systems associated with root systems of indefinite type
Creators: name: Takenawa, Tomoyuki
Publisher: name: arXiv
Year: 2001
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: A geometric charactrization of the equation found by Hietarinta and Viallet, which satisfies the singularity confinement criterion but which exhibits chaotic behavior, is presented. It is shown that this equation can be lifted to an automorphism of a certain rational surface and can therefore be considered to be a realization of a Cremona isometry on the Picard group of the surface. It is also shown that the group of Cremona isometries is isomorphic to an extended Weyl group of indefinite type. A method to construct the mappings associated with some root systems of indefinite type is also presented.
description: 24 pages, 2 figures, platex file
Inhalts-Verzeichniss
Creators: name: N., N.
Publisher: name: Acta Albertina Ratisbonensia
Year: 2017

description: Jahresbericht für 1905 und 1906 Rechnungsabschluss 1905, 1906 Mitglieder-Verzeichniss Originalabhandlungen:
description: Acta Albertina Ratisbonensia, Bd. 11 (1908): Berichte des Naturwissenschaftlichen (früher zoologisch - mineralogischen) Vereines zu Regensburg XI. Heft für die Jahre 1905 und 1906
Landau levels in the case of two degenerate coupled bands: kagome lattice tight-binding spectrum
Creators: name: Xiao, Yi
name: Pelletier, Vincent
name: Chaikin, Paul M.
name: Huse, David A.
Publisher: name: arXiv
Year: 2002
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The spectrum of charged particles hopping on a kagome lattice in a uniform transverse magnetic field shows an unusual set of Landau levels at low field. They are unusual in two respects: the lowest Landau levels are paramagnetic so their energies decrease linearly with increasing field magnitude, and the spacings between the levels are not equal. These features are shown to follow from the degeneracy of the energy bands in zero magnetic field. We give a general discussion of Landau levels in the case of two degenerate bands, and show how the kagome lattice tight-binding model includes one special case of this more general problem. We also discuss the consequences of this for the behavior of the critical temperature of a kagome grid superconducting wire network, which is the experimental system that originally motivated this work.
description: 18 pages, 8 figures