cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Comparison of core-hole excitation spectra of organic donor/acceptor molecules in the vapor and condensed phases: p-nitroaniline, 2-amino-6-nitronaphthalene and 1-amino-4-nitronaphthalene
Creators: name: Freund, H. J.
name: Slaughter, A. R.
name: Ballina, S. M.
name: Banna, M. S.
name: Bigelow, R. W.
name: Dick, Bernhard
name: Lex, J.
name: Deger, H. M.
Publisher: name: Universität Regensburg
Year: 1984
Subjects: subject: Crystal structure; Molecular structure (of aminonitronaphthalene); Photoelectric emission (x-ray, of aminonitronaphthalene isomers); XPS org donor acceptor mol; photoelectron org donor acceptor mol; naphthalene amino nitro XPS; aniline nitro XPS
subject: 540 Chemie

description: Vapor phase N1s and O1s core-hole spectra of the org. donor/acceptor mols. 2-amino-6-nitronaphthalene (2,6-ANN) and 1-amino-4-nitronaphthalene (1,4-ANN) are presented and compared to condensed phase results. 2,6-ANN and 1,4-ANN exhibit broad single peak N1s(NO2) signals in the gas phase which are split into resolvable components in the solid. The spectral differences noted on going from the vapor phase to the solid parallel previous results on p-nitroaniline (PNA). Unlike the situation encountered in PNA (and 2,6-ANN), however, O1s(NO2) spectrum of 1,4-ANN also indicates a moderately increased splitting as well as an apparent decrease in shake-up intensity on going from the vapor to the condensed phase. Spectral differences between the 2 phases are addressed within the CNDO/S(CI) equiv.-core approxn. including up to doubly excited singlet-coupled configurations as a means of elucidating the apparent core-hole induced intermol. coupling. Comparison computations are presented on PNA, 2,6-ANN, and 1,4-ANN. X-ray crystallog. measurements on 2,6-ANN indicate an intermol. donor/acceptor pairing scheme as in PNA. Dimer models were used to computationally address solid state interactions. The N1s(NO2) spectral differences obsd. in PNA, 2,6-ANN, and 1,4-ANN on going from the vapor to the condensed phase are attributed to strong core-hole induced intermol. orbital mixing.
description: CAN 101:180468 73-6 Optical, Electron, and Mass Spectroscopy and Other Related Properties 3230-35-1 Role: PRP (Properties) (XPS of vapor and solid state and crystal structure of); 100-01-6 Role: PRP (Properties) (XPS of, in vapor and solid state); 776-34-1 Role: PRP (Properties) (XPS of, vapor and solid state)
Phonon-Mediated Nonequilibrium Interaction between Nanoscale Devices
Creators: name: Schinner, G. J.
name: Tranitz, H.-P.
name: Wegscheider, Werner
name: Kotthaus, J. P.
name: Ludwig, S.
Publisher: name: Universität Regensburg
Year: 2009
Subjects: subject: 530 Physik
subject: 73.63.-b
subject: 03.67.-a
subject: 68.65.-k
subject: 73.23.-b

description: Interactions between mesoscopic devices induced by interface acoustic phonons propagating in the plane of a two-dimensional electron system (2DES) are investigated by phonon spectroscopy. In our experiments, ballistic electrons injected from a biased quantum point contact emit phonons and a portion of them are reabsorbed exciting electrons in a nearby degenerate 2DES. We perform energy spectroscopy on these excited electrons employing a tunable electrostatic barrier in an electrically separate and unbiased detector circuit. The transferred energy is found to be bounded by a maximum value corresponding to Fermi-level electrons excited and backscattered by absorbing interface phonons. Our results imply that phonon-mediated interaction plays an important role for the decoherence of solid-state-based quantum circuits.
MPEC 2025-F243 : 2025 FM15
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2025
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2025 FM15

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.
Study of the Spin Crossover Molecular Thin Films and Magnetic Multilayered Thin Films
Creators: name: Yazdani, Saeed
Publisher: name: Purdue University Graduate School
Year: 2023
Subjects: Condensed matter physics not elsewhere classified

description: Some molecular complexes exhibiting bistability between two different spin states have been subject to vast investigations. Spin crossover and valence tautomerism interconversion molecular compounds are such examples showing this dynamic switching behavior and are a route toward designing molecular devices with a facile readout due to the change in the spin state that accompanies the change in conductance. Due to their extensive potential applications in industry and research, they are among the most interesting topics in spintronics. Spin state switching processes provide the foundation for applications in molecule-based devices. The main goal is to study the parameters that affect the intramolecular electron transfer between different spin states in spin crossover molecular thin films and the electron transfer between the metal center and redox-active ligands in valence tautomer thin films. Because substrate effects are important for any molecular-based device, there are increasing efforts to study the influence of the substrate on spin state transition. While some non-metallic substrates like graphite seem to be promising from experimental measurements, theoretical and experimental studies indicate that 2D semiconductor surfaces will have minimum interaction with spin crossover molecules. In this work, the functionality of two different spin crossover molecules sublimated on the ferroelectric Polyvinylidene Fluoride Hexafluoropropylene (PVDF-HFP) layer and 2D Ti3C2 MXene thin film is studied. We report the temperature-dependent spin state transition of spin crossover molecules, [Fe{H2B(pz)2}2 (bipy)], thin films, and valance tautomer [Co(sq)(cat)(3-tpp)2] thin films. Using a UV-Vis spectrometer and a specific lab-built sample holder we were able to perform the measurement at temperatures as low as 90 K and as high as 440 K. Temperature-dependent UV-Vis data show that the transition temperature from the high spin state to the low spin state and vice versa is well below the room temperature. However, for isothermal switching purposes, we designed and fabricated a bilayer device with PVDF-HFP thin films as the substrate to facilitate isothermal switching close to room temperature. The retention of voltage-controlled nonvolatile changes to the electronic structure in bilayers of PVDF-HFP/[Fe{H2B(pz)2}2(bipy)] and PVDF-HFP/[Co(sq)(cat)(3-tpp)2] strongly depends on the thickness of the PVDF-HFP layer. While the electric transport measurement revealed that doping the SCO layer with Ti3C2 MXene flakes can significantly improve the conductivity of the spin crossover molecular thin films, the temperature-dependent UV-Vis measurements represent that the adjacent MXene layer can cause a lock in the given spin state or a change in the transition temperature dramatically.
Adaptive-network models of swarm dynamics
Creators: name: Huepe, Cristián
name: Zschaler, Gerd
name: Do, Anne-Ly
name: Gross, Thilo
Publisher: name: arXiv
Year: 2010
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Physical sciences

description: We propose a simple adaptive-network model describing recent swarming experiments. Exploiting an analogy with human decision making, we capture the dynamics of the model by a low-dimensional system of equations permitting analytical investigation. We find that the model reproduces several characteristic features of swarms, including spontaneous symmetry breaking, noise- and density-driven order-disorder transitions that can be of first or second order, and intermittency. Reproducing these experimental observations using a non-spatial model suggests that spatial geometry may have a lesser impact on collective motion than previously thought.
description: 8 pages, 3 figures
New results on D-optimal Matrices
Creators: name: Djokovic, Dragomir Z.
name: Kotsireas, Ilias S.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05B20, 05B30

description: We construct a number of new (v;r,s;lambda) supplementary difference sets (SDS) with v odd and lambda = (r+s)-(v-1)/2. In particular, these give rise to D-optimal matrices of the four new orders 206, 242, 262, 482 constructed here for the first time.
description: 13 pages, 1 table
Nonlinear magnetic field dependence of spin polarization in high density two-dimensional electron systems
Creators: name: Yang, K. F.
name: Liu, H. W.
name: Mishima, T. D.
name: Santos, M. B.
name: Nagase, K.
name: Hirayama, Y.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The spin polarization (P) of high-density InSb two-dimensional electron systems (2DESs) has been measured using both parallel and tilted magnetic fields. P is found to exhibit a superlinear increase with the total field B. This P-B nonlinearity results in a difference in spin susceptibility between its real value Xs and Xgm ~ m*g*(m* and g* are the effective mass and g factor, respectively) as routinely used in experiments. We demonstrate that such a P-B nonlinearity originates from the linearly P-dependent g* due to the exchange coupling of electrons rather than from the electron correlation as predicted for the low-density 2DES.
description: 14 pages, 4 figures
Charge-density waves in deconfining SU(2) Yang-Mills thermodynamics
Creators: name: Falquez, Carlos
name: Hofmann, Ralf
name: Baumbach, Tilo
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: At one-loop accuracy we compute, characterize, and discuss the dispersion laws for the three low-momentum branches of propagating longitudinal, electric U(1) fields in the effective theory for the deconfining phase of pure SU(2) Yang-Mills thermodynamics. With an electric-magnetically dual interpretation of SU(2)$_{\tiny CMB}$ we argue that upon a breaking of plasma isotropy and homogeneity, introduced e.g. by a temperature gradient, the longitudinal modes could conspire to provide magnetic seed fields for magneto-hydrodynamical dynamos inside structures of galaxy, galaxy-cluster, and cosmological scales. Such a scenario ultimately links structure with seed-field formation. As judged from the present cosmological epoch, the maximally available coherent field strength of 10$^{-8}$\,Gauss from SU(2)$_{\tiny CMB}$ matches with the upper bound for cosmological present-day field strength derived from small-angle anisotropies of the cosmic microwave background.
description: 13 pages, 4 figures: v2 small typos corrected
Young adult smoking cessation and mobile health : a qualitative investigation of the Crush the Crave app
Creators: name: Struik, Laura Louise
Publisher: name: University of British Columbia
Year: 2017

description: Smoking remains a major public health issue, particularly among young adults because smoking rates are highest in this demographic. With young adults’ low uptake of the various smoking cessation interventions available, innovative ways to support young adult smoking cessation are needed, and there is much enthusiasm about the use of mobile phones, especially apps, to reach this population. How these tools influence smoking cessation, however, remains largely unknown. Therefore, the purpose of this qualitative case study was to understand the design and use of the mobile app, Crush the Crave (CTC), for helping young adults quit smoking. Data included document analysis, fieldwork, and semi-structured interviews with 15 key informants (those involved in the development of CTC) and 31 young adult CTC users. Guided by sociomateriality theory and an affordances approach, as well as a gender-based analysis, data were inductively analyzed to derive thematic findings in relation to the influence of CTC on young adult’s quit smoking efforts. Findings were grouped per the overall strengths and limitations of the app, and the affordances of the app. Affordances were grouped according to each design component of the app: credibility, task support, social support, and dialogue support. Data from key informants revealed the expectations of CTC for helping young adults quit smoking, which were juxtaposed to young adults’ actual experiences with the app. While key informants’ expectations often aligned with young adults’ experiences, there were also some noteworthy differences and additional experiences that the key informants did not anticipate. The credibility, task support, and dialogue support functions lent to largely positive experiences and practices, including trust in the app, encouragement and motivation for quitting, and enhanced awareness of smoking behaviour. The social support component lent to negative user experiences (vulnerability) and practices (low engagement) that rendered this aspect as the weakest component in supporting efforts to quit. There were also some notable gender differences and similarities in relation to the preferences and experiences of young women and men. This study highlights both productive and unproductive approaches to the development of smoking cessation apps, and offers new directions for future improvements and app development.
Effect of Microwaves on the Current-Phase Relation of Superconductor-Normal-Metal-Superconductor Josephson Junctions
Creators: name: Fuechsle, M.
name: Bentner, J.
name: Ryndyk, D. A.
name: Reinwald, Matthias
name: Wegscheider, Werner
name: Strunk, Christoph
Publisher: name: Universität Regensburg
Year: 2009
Subjects: subject: 530 Physik
subject: 74.25.Nf
subject: 74.45.+c
subject: 74.50.+r

description: We investigate the current-phase relation (CPR) of long diffusive superconductor–normal-metal–superconductor (Nb/Ag/Nb) Josephson junctions in thermodynamic equilibrium and under microwave irradiation. While in equilibrium good agreement with the predictions of quasiclassical theory is found, we observe that the shape of the CPR can be strongly affected by microwave irradiation. Close to a Josephson-phase difference phi~=pi, the supercurrent can be strongly suppressed when increasing the rf power. Our results can be understood in terms of microwave excitation of low-lying Andreev bound states across the minigap in the junction. In the frequency interval studied, this mechanism becomes important, when the minigap closes at phi~=pi.
title: Imaging Summarization of Grataco's and Figuera's Protocol for Diagnosis, Staging and Management of FGR: Pictoral essay
Creators: name: Kapanigowda, Manojkumar
Publisher: name: European Congress of Radiology
Year: 2019
Subjects: subject: Foetus
subject: Education
subject: Ultrasound-Spectral Doppler
subject: Foetal imaging

description: Learning objectives Background Findings and procedure details Conclusion Personal information References
description: Learning objectives: The purpose of this educational exhibit is to: To discuss the assessment of fetal growth and the diagnosis of fetal growth restriction (FGR) To demonstrate the pattern of normal and abnormal spectral Doppler in the diagnosis of FGR To learn...
High-performance single-photon generation with commercial-grade optical fiber
Creators: name: Söller, Christoph
name: Cohen, Offir
name: Smith, Brian J.
name: Walmsley, Ian A.
name: Silberhorn, Christine
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: High-quality quantum sources are of paramount importance for the implementation of quantum technologies. We present here a heralded single-photon source based on commercial-grade polarization-maintaining optical fiber. The heralded photons exhibit a purity of at least 0.84 and an unprecedented heralding efficiency into single-mode fiber of 85%. The birefringent phase-matching condition of the underlying four-wave mixing process can be controlled mechanically to optimize the wavelength tuning needed for interfacing multiple sources, as are required for large-scale entanglement generation.
description: 5 pages, 2 figures
Quantum fluctuations as deviation from classical dynamics of ensemble of trajectories parameterized by unbiased hidden random variable
Creators: name: Budiyono, Agung
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A quantization method based on replacement of c-number by c-number parameterized by an unbiased hidden random variable is developed. In contrast to canonical quantization, the replacement has straightforward physical interpretation as statistical modification of classical dynamics of ensemble of trajectories, and implies a unique operator ordering. We then apply the method to develop quantum measurement without wave function collapse á la pilot-wave theory.
description: 14 pages, accepted in Physica A
Phegea51-2. Proterebia phegea (Lepidoptera: Nymphalidae: Satyrinae): building bridges between the relic populations of Croatia, Bosnia-Herzegovina, Greece, and a new record from northern Albania
Creators: name: Prendi, Marko
name: Paparisto, Anila
name: Cuvelier, Sylvain
Publisher: name: figshare
Year: 2023
Subjects: Animal behaviour

description: Proterebia phegea (Borkhausen, 1788) (Lepidoptera: Nymphalidae: Satyrinae) is a butterfly with a restricted and fragmented distribution in the Balkan Peninsula. During a field trip on 26.iv.2022, within the area of the artificial Vau-Dejës Lake in northern Albania, the first author observed one female of P. phegea. The butterfly was found in a forest habitat on sandy, dark-reddish ophiolite rocky substrate. Twenty butterfly species were recorded in that area during the field trips, between March 2021 to September 2022, including Hipparchia fagi (Scopoli, 1763) occurring together with Hipparchia syriaca (Staudinger, 1871), Hipparchia statilinus (Hufnagel, 1766), and ten species of Odonata. This is only the second locality in Albania where P. phegea has been found. These two distant localities form a bridge between the well-documented populations of Croatia, Bosnia-Herzegovina, and Greece. The dragonfly, Trithemis annulata (Palisot de Beauvois, 1807) is new for northern Albania. The known and potential distribution, phenology and conservation status of P. phegea in Albania are discussed.
title: Разработка бота расписания учебных занятий университета для ВКонтакте
Creators: name: Лихач, Александр
Publisher: name: Новгородский государственный университет имени Ярослава Мудрого (НовГУ)
Year: 2021

description: Рассмотрена разработка бота расписания занятий Новгородского государственного университета имени Ярослава Мудрого для социальной сети ВКонтакте на языке программирования Python. Описаны этапы разработки от сбора данных с сайта университета до развёртывания бота на хостинге. Также рассматривается API как мост между сайтом университета и ботом.
Photophysics and photochemistry of main group metals with an s² electron configuration. Luminescence quenching and photoreduction of trihydroxoplumbate(II) by hydroxide
Creators: name: Becht, A.
name: Vogler, Arnd
Publisher: name: Universität Regensburg
Year: 1994
Subjects: subject: Photochemistry - luminescence - lead (II) - hydroxo complex
subject: 540 Chemie

description: The luminescence of Pb(OH) 3 − in deaerated aqueous solution is quenched by hydroxide withk = 1.87 × 105 Lmol−1 s−1. It is suggested that this quenching is associated with an electron transfer from hydroxide to Pb(OH) 3 − in its3P1 sp-excited state. This assumption is supported by the photochemical behaviour of Pb(OH) 3 − which is photoreduced to metallic lead. The efficiency of the photolysis increase with hydroxide concentration.
Electronic Spectra and Photochemistry of Trichlorostannyl Complexes of Rhodium(III) and Platinum(II)
Creators: name: Pawlowski, V.
name: Kunkely, Horst
name: Vogler, Arnd
Publisher: name: Universität Regensburg
Year: 1994
Subjects: subject: 540 Chemie

description: The absorption spectra of [Rh(SnCl3)4Cl2]3− and [Pt(SnCl3)5]3− are characterized by a similar band pattern. It is suggested that the absorption spectra are dominated by bands which are assigned to intraligand transitions. While solid (NBu4)3[Pt(SnCl3)5] shows a low-temperature emission the rhodium complex is not luminescent. Both complex anions are light sensitive in acetonitrile solution. They undergo an efficient photosubstitution of the trichlorostannyl ligand.
An inhomogeneous, anisotropic, elastically modified Gibbs-Thomson law as singular limit of a diffuse interface model
Creators: name: Garcke, Harald
name: Kraus, Christiane
Publisher: name: Universität Regensburg
Year: 2010
Subjects: subject: Van der Waals–Cahn–Hilliard energy, singular perturbations, anisotropic and inhomogeneous interfacial energy, elasticity, Gibbs–Thomson law.
subject: 510 Mathematik
subject: 82B26
subject: 49Q20

description: We consider the sharp interface limit of a diffuse phase field model with prescribed total mass taking into account a spatially inhomogeneous anisotropic interfacial energy and an elastic energy. The main aim is the derivation of a weak formulation of an anisotropic, inhomogeneous, elastically modified Gibbs–Thomson law in the sharp interface limit. To this end we show that one can pass to the limit in the weak formulation of the Euler–Lagrange equation of the diffuse phase field energy.
Maximal CHSH violations with low efficiency photodetection and homodyne measurements
Creators: name: Quintino, Marco Túlio
name: Araújo, Mateus
name: Cavalcanti, Daniel
name: Santos, Marcelo França
name: Cunha, Marcelo Terra
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study nonlocality tests in which each party performs photodetection and homodyne measurements. The results of such measurements are dichotomized and a Clauser-Horne-Shimony-Holt (CHSH) inequality is used. We prove that in this scenario the maximal violation is attainable and fully characterize the set of maximally violating states. If we restrict our search to states composed by at most 2, 4, and 6 photons per mode, we find critical photodetection efficiencies of 0.48, 0.36, and 0.29. We also found an entangled variation of the famous cat states that has critical efficiency 0.32. These values are well within the limit of current photodetector technology, which suggests the present approach as a road for a loophole-free Bell experiment.
description: 8+3 pages, 3 figures; proofs simplified. Accepted for publication in JPA
From weak to strong localization in a ferromagnetic high mobility 2DHG
Creators: name: Wurstbauer, Ursula
name: Schuh, Dieter
name: Weiss, Dieter
name: Wegscheider, Werner
Publisher: name: Universität Regensburg
Year: 2010
Subjects: subject: Quantum Hall effect; Metal-insulator transition; Strong localization effect; Weak antilocalization; Magnetic 2DHG Article Outline
subject: 530 Physik

description: Manganese modulation-doped two-dimensional hole systems confined in strained InAs/InGaAs/InAlAs heterostructures were investigated by low-temperature magnetotransport experiments. The study demonstrates quantized transport phenomena in the high field region, weak anti-localization in the low-field region and ferromagnetic ordering in the separated and insulating manganese-doped layer. A significant amount of manganese in the channel of inverted modulation-doped structures causes a strong localization effect with hysteretic-like abrupt resistance changes over several orders of magnitude at very low temperatures.
Photochemistry of barium(II) and lead(II) 2,4-dinitrostilbene-4'-monoaza-18-crown-6 complexes
Creators: name: Mrozek, H.
name: Nikol, H.
name: Vogler, Arnd
name: Vögtle, F.
Publisher: name: Universität Regensburg
Year: 1994
Subjects: subject: 540 Chemie

description: The chromoionophore trans-2,4-dinitrostilbene-4′-monoaza-18-crown-6 (DMC) in CH3OH is characterized by a long-wavelength absorption (λmax = 476 nm) which is attributed to a charge transfer (CT) transition from the amine function to the nitro substituents. On protonation or complexation with Ba2+ or Pb2+ the amine is blocked and the CT transition is replaced by a ππ* transition of the stilbene moiety at higher energies. The photochemistry of all species is in accord with these assignment. While the photolysis of DMC leads to the formation of an isatogen, DMCH+, [Ba(DMC)]2+ and [Pb(DMC)]2+ undergo trans-cis photoisomerization of the stilbene moiety.
Fun with ferrocene : synthesis of polyiron complexes using 1,1'-diaminoferrocene based ligands
Creators: name: Pick, Fraser Stanley
Publisher: name: University of British Columbia
Year: 2017

description: Reactions of an amidophosphine supported ditantalum tetrahydride, ([NPNSi]Ta)₂(μ-H)₄ and COx (x = 1, 2) were studied and all products were fully characterized. Selective deuteration allows for the production of two deuterated isotopomers which were used in low temperature NMR and GC-MS experiments in order to support a computationally determined mechanism. Iron and cobalt complexes of a ferrocene linked bis(phosphinoamide) were synthesized and characterized by X-ray crystallography and Mössbauer spectroscopy. The cobalt complex contains a Co–Fe bond that was absent in the all-iron complex. The Co–Fe bond was further studied using DFT calculations, which suggest that the bond is comprised of donation from the iron center to the cobalt center (Fe → Co) and back donation from the cobalt center to antibonding orbitals in the ferrocene backbone (Co → fc*). A putative nickel complex supported by the same bis(phosphinoamide) ligand underwent a reductive elimination of the amidophosphine groups forming a new P-N bond. Reactions between the aforementoned iron complex and H₂, CO₂ and other electrophiles were studied and the products of these reactions were fully characterized. The products of these reactions show that the iron phosphinoamides can cooperativley activate a variety of bonds without changing the oxidation state at iron. Upon reduction, the iron complex forms an Fe–Fe bond while remaining in a high spin state. The cleavage of the N=N double bond of azobenzene was achieved under photolytic conditions using the same iron phosphinoamide and is thought to involve formation of a putative iron imido which migrates to the phosphinoamide groups. Due to the tendency of iron phosphinoamides to activate substrates using ligand cooperativity, an alternative ligand using amidophosphine donors was syntheisized and initial coordination studies were performed.
Photochemistry and Photophysics of Antimony(III) Hyper Porphyrins: Activation of Dioxygen Induced by a Reactive sp Excited State
Creators: name: Knör, Günther
name: Vogler, Arnd
Publisher: name: Universität Regensburg
Year: 1994
Subjects: subject: 540 Chemie

description: Observations of the photoredox reactivity of antimony(III) porphyrin complexes are reported. Upon irradiation with visible light under ambient conditions, a photooxidation to the corresponding dihydroxoantimony(V) porphyrins occurs. At the same time a two-electron or four-electron reduction of molecular oxygen takes place, depending on the experimental conditions. In the absence of suitable electron acceptors, a photoinduced disproportionation reaction occurs. The photolysis of antimony(III) porphyrins shows a pronounced wavelength dependence. The reactive excited state is concluded to be of the metal-centered sp type. An extended model for the electronic structure of p-type hyper metalloporphyrins is suggested.
Period Doubling Renormalization for Area-Preserving Maps and Mild Computer Assistance in Contraction Mapping Principle
Creators: name: Gaidashev, Denis
Publisher: name: arXiv
Year: 2010
Subjects: subject: Dynamical Systems (math.DS)
subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 37J10, 37E20, 37J20, 37M99

description: It has been observed that the famous Feigenbaum-Coullet-Tresser period doubling universality has a counterpart for area-preserving maps of ${\fR}^2$. A renormalization approach has been used in a "hard" computer-assisted proof of existence of an area-preserving map with orbits of all binary periods in Eckmann et al (1984). As it is the case with all non-trivial universality problems in non-dissipative systems in dimensions more than one, no analytic proof of this period doubling universality exists to date. In this paper we attempt to reduce computer assistance in the argument, and present a mild computer aided proof of the analyticity and compactness of the renormalization operator in a neighborhood of a renormalization fixed point: that is a proof that does not use generalizations of interval arithmetics to functional spaces - but rather relies on interval arithmetics on real numbers only to estimate otherwise explicit expressions. The proof relies on several instance of the Contraction Mapping Principle, which is, again, verified via mild computer assistance.
A Study of Gall Diseased Laminae in the Marine Brown Alga Durvillaea potatorum. R. Jahnke (1978) BSC Hons Thesis La Trobe University, Melbourne.
Creators: name: Jahnke, Roland
Publisher: name: figshare
Year: 2023
Subjects: Phycology (incl. marine grasses)
Plant pathology

description: BSc Honours Thesis 1978 The pathological development of a marine algal gall on the laminae of Durvillaea potatorum (Labillardière) Areschoug has been investigated. Three phases in gall development were evident. Galls result from the hyperplasia of cells in the inner cortical layer of laminae. Ultrastructural investigation revealed the presence of endophytic bacteria in both healthy and diseased lamina tissue and a slime mould which was exclusively associated with diseased plants. The bacteria were rod shaped and found only in intercellular mucilage. Bacteria were isolated and characterized partially. A comparison of bacterial density in healthy and diseased tissues was unsuccessful. An investigation into the nature of the slime mould revealed sporangia of the type formed by slime mould parasites of terrestrial plants. Attempts to culture the organism failed. The organism shows a close affinity to the Myxomycota, order Plasmodiophorales, rather than the order Labyrinthulales. The life cycle within the host cell was determined partially. Inoculation experiments with the organism in the field were successful.
 Note: Additional photographic plates were included after thesis submission. No scientific paper published.
Photochemistry of the Oxo-bridged Diiron(III) Core. Evolution of Oxygen induced by FeIII to FeII Charge-transfer Excitation of μ-Oxobis[(ethylenediaminetetraacetato)ferrate(III)]
Creators: name: Kunkely, Horst
name: Vogler, Arnd
Publisher: name: Universität Regensburg
Year: 1994
Subjects: subject: 540 Chemie

description: The reversible photolysis of aqueous [{FeIII(edta)}2O]4– leads to the evolution of oxygen and the formation of [FeII(edta)]2–; it is suggested that the photoreaction is induced by FeIII to FeIII charge-transfer excitation, which yields FeII and FeIVO in the primary photochemical step.
Spectrophotometric studies of the photolysis of diazido-bis(phosphine)-metal(II) complexes
Creators: name: Hennig, H.
name: Ritter, K.
name: Knoll, H.
name: Vogler, Arnd
Publisher: name: Universität Regensburg
Year: 1993
Subjects: subject: 540 Chemie

description: The photolysis of mixed ligand complexes of the type MLn(N3)2 (M=Ni, Pd, Pt; L = phosphane and diphosphane ligands, respectively; n = 1, 2) was monitored by electronic spectroscopy in absorption, emission and excitation. Initial quantum yields of these complexes were measured in CH2Cl2 and EtOH in dependence on the irradiation wavelength. Photochemically formed MOIn fragments of Pd and Pt are distinguished by an intensive emission detected at 77 K. No emission was observed with respect to the appropriate NiO fragments. An initial emission at 615 nm detected by irradiating Pd(PPh3)2(N3)2 at 77 K is explained by assuming a photochemical cis/trans isomerization Quenching experiments have been performed by using Ru(bpy)3Cl2, Os(bpy)3Cl2, Re(CO)3(phen)Cl and Cr(bpy)3(ClO4)3 as sensitizers and the mixed-ligand complexes under discussion as quenchers.
Phegea51-2. Butterflies of Albania: new surveys, four new records and a new checklist (Lepidoptera: Papilionoidea)
Creators: name: Blicher Bjerregård, Emil
name: Bjerg, Martin
name: Bornø Clausen, Allan
name: Dahl, Kaj
name: Glintborg, Søren Peter
name: Videnkjær, Christian
Publisher: name: figshare
Year: 2023
Subjects: Animal behaviour

description: The butterfly fauna of Albania is probably the least studied in Europe. Albania has been completely isolated for decades and is known as an extremely difficult country for studying insects. In the summer of 2019 Dansk Lepidopterologisk Forening arranged the expedition called CASMEK1 to Albania to provide information about the butterfly fauna. In 2017 two expeditions were carried out by VVE1 and VVE2, which were two teams with focus on studying the butterfly fauna of Albania. Among other observations, VVE1 and VVE2 found four new species for Albania. Also, for this survey, four further new species for Albania were recorded: Limenitis camilla (Linnaeus, 1764), Araschnia levana (Linnaeus, 1758), Euphydryas maturna (Linnaeus, 1758), and Erebia alberganus (Prunner, 1798) (Nymphalidae). In addition to the new species for Albania, other interesting records are also reviewed in this article. Information is provided on Spialia phlomidis (Herrich-Schäffer, 1845) (Hesperiidae), Colias aurorina Herrich-Schäffer, 1850 (Pieridae), Apatura iris (Linnaeus, 1758), Boloria titania (Esper, 1793), Melitaea diamina (Lang, 1789), Pseudochazara amymone Brown, 1976, and Pseudochazara tisiphone Brown, 1981 (Nymphalidae). All three teams (CASMEK1, VVE1, and VVE2) contributed to the distribution records of the butterfly fauna of Albania.
Lower and upper bounds for the Lyapunov exponents of twisting dynamics: a relationship between the exponents and the angle of the Oseledet's splitting
Creators: name: Arnaud, Marie-Claude
Publisher: name: arXiv
Year: 2011
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics

description: We consider locally minimizing measures for the conservative twist maps of the $d$-dimensional annulus or for the Tonelli Hamiltonian flows defined on a cotangent bundle $T^*M$. For weakly hyperbolic such measures (i.e. measures with no zero Lyapunov exponents), we prove that the mean distance/angle between the stable and the unstable Oseledet's bundles gives an upper bound of the sum of the positive Lyapunov exponents and a lower bound of the smallest positive Lyapunov exponent. Some more precise results are proved too.
Searching for small simple automorphic loops
Creators: name: Johnson, Kenneth W.
name: Kinyon, Michael
name: Nagy, Gabor
name: Vojtechovsky, Petr
Publisher: name: arXiv
Year: 2010
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 20N05

description: A loop is (right) automorphic if all its (right) inner mappings are automorphisms. Using the classification of primitive groups of small degrees, we show that there is no nonassociative simple commutative automorphic loop of order less than $2^{12}$, and no nonassociative simple automorphic loop of order less that 2500. We obtain examples of nonassociative simple right automorphic loops.
description: 15 pages. V2: revisions following suggestions of referee, to appear in LMS J. Computation and Mathematics
title: Normal Planes and Anomalies of Fetal Face: Pictorial essay
Creators: name: Kapanigowda, Manojkumar
Publisher: name: European Congress of Radiology
Year: 2019
Subjects: subject: Foetus
subject: Education
subject: Ultrasound
subject: Foetal imaging
subject: Eyes
subject: Ear / Nose / Throat

description: Learning objectives Background Findings and procedure details Conclusion Personal information References
description: Learning objectives: The purpose of this educational exhibit is to: To demonstrate the various standard normal planes in fetal face evaluation. To demonstrate ultrasound imaging appearances of various fetal facial anomalies To discuss the tips and tricks in...
Semileptonic form factors D →π, K and B →π, K from a fine lattice
Creators: name: Al-Haydari, A.
name: Ali Khan, A.
name: Braun, Vladimir M.
name: Collins, Sara
name: Göckeler, Meinulf
name: Lacagnina, G. N.
name: Panero, M.
name: Schäfer, Andreas
name: Schierholz, Gerrit
Publisher: name: Universität Regensburg
Year: 2010
Subjects: subject: 530 Physik

description: We extract the form factors relevant for semileptonic decays of D and B mesons from a relativistic computation on a fine lattice in the quenched approximation. The lattice spacing is a=0.04 fm (corresponding to a^{-1}=4.97 GeV), which allows us to run very close to the physical B meson mass, and to reduce the systematic errors associated with the extrapolation in terms of a heavy quark expansion. For decays of D and D_s mesons, our results for the physical form factors at q^2=0 are as follows: f_+^{D to pi}(0)= 0.74(6)(4), f_+^{D to K}(0)= 0.78(5)(4) and f_+^{D_s to K}(0)=0.68(4)(3). Similarly, for B and B_s we find: f_+^{B to pi}(0)=0.27(7)(5), f_+^{B to K}(0)=0.32(6)(6) and f_+^{B_s to K}(0)=0.23(5)(4). We compare our results with other quenched and unquenched lattice calculations, as well as with light-cone sum rule predictions, finding good agreement.
Conic Sections on the Sky: Shadows of Linearly Superrotated Black Holes
Creators: name: Lin, Feng-Li
name: Patel, Avani
name: Payne, Jason
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Soft hairs are an intrinsic infrared feature of a black hole, which may also affect near-horizon physics. In this work, we study some of the subtleties surrounding one of the primary observables with which we can study their effects in the context of Einstein's gravity: the black hole shadow. First, we clarify the singular pathology associated with black holes with soft hairs and demonstrate that the metrics of linearly superrotated black holes are free of near-zone pathologies due to appropriate asymptotic falloff conditions being imposed on the event horizon. We then analytically construct the photon orbits around such black holes, derive the shadow equation for near-zone observers, and find that the linear superrotation hairs deform the circular shadow of a bald Schwarzchild black hole into an ellipse. This is in sharp contrast to their supertranslated counterparts, which only shift the position of the center of the circular shadow but do not change its shape. Our results suggest a richness to the observable effects due to the infrared structures of Einstein's gravity.
description: 10 pages, 3 figures, v4. Minor correction to the caption of Figure 1
title: Spectrum of Fetal Spine Anomalies: A pictorial essay
Creators: name: Kapanigowda, Manojkumar
Publisher: name: European Congress of Radiology
Year: 2019
Subjects: subject: Foetal imaging
subject: Musculoskeletal spine
subject: Ultrasound
subject: Education
subject: Foetus

description: Learning objectives Background Findings and procedure details Conclusion Personal information References
description: Learning objectives: The purpose of this educational exhibit is to: To demonstrate the important features of the normal spine which rule out many anomalies. To describe the classification of spine abnormalities. To demonstrate the ultrasound appearances of various...
Photoredox reaction of a trinuclear Co(III), Co(III), Ru(II) complex induced by metal-to-metal charge transfer excitation and a subsequent charge shift
Creators: name: Kunkely, Horst
name: Vogler, Arnd
Publisher: name: Universität Regensburg
Year: 1993
Subjects: subject: 540 Chemie

description: The trinuclear complex (NH3)5CoIII(μ-NC)CoIII(CN)4(μ-CN)RuII(CN)53− shows a long wavelength absorption near 370 nm which is assigned to a metal-to-metal charge transfer (MMCT) transition from Ru(II) to the central Co(III) ion. Light absorption by this bands leads to a redox decomposition: (NH3)5CoIII(CN)4(μ-CN)RuII(CN)53−→5NH3+ Co2++CoIII(CN)63−+ RuIII(CN)5H2O2−. It is suggested that the initial MMCT transition is followed by a charge shift from the central Co(II) to the cobalt(III) ammine moiety which subsequently undergoes a rapid irreversible decay.
Silting mutation in triangulated categories
Creators: name: Aihara, Takuma
name: Iyama, Osamu
Publisher: name: arXiv
Year: 2010
Subjects: subject: Representation Theory (math.RT)
subject: Category Theory (math.CT)
subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics

description: In representation theory of algebras the notion of `mutation' often plays important roles, and two cases are well known, i.e. `cluster tilting mutation' and `exceptional mutation'. In this paper we focus on `tilting mutation', which has a disadvantage that it is often impossible, i.e. some of summands of a tilting object can not be replaced to get a new tilting object. The aim of this paper is to take away this disadvantage by introducing `silting mutation' for silting objects as a generalization of `tilting mutation'. We shall develope a basic theory of silting mutation. In particular, we introduce a partial order on the set of silting objects and establish the relationship with `silting mutation' by generalizing the theory of Riedtmann-Schofield and Happel-Unger. We show that iterated silting mutation act transitively on the set of silting objects for local, hereditary or canonical algebras. Finally we give a bijection between silting subcategories and certain t-structures.
description: 29 pages
Renormalization of twist-four operators in QCD
Creators: name: Braun, Vladimir M.
name: Manashov, Alexander
name: Rohrwild, Jürgen
Publisher: name: Universität Regensburg
Year: 2010
Subjects: subject: 530 Physik

description: Extending the work by Bukhvostov, Frolov, Lipatov and Kuraev (BFLK) on the renormalization of quasipartonic operators we derive a complete set of two-particle renormalization group kernels that enter QCD evolution equations to twist-four accuracy. To this end we develop a new technique which essentially bypasses calculation of Feynman diagrams. It is shown that the 2→2 evolution kernels which involve “non-partonic” components of field operators, and, most remarkably, also 2→3 kernels do not require independent calculation and can be restored from the known results for quasipartonic operators using conformal symmetry and Lorentz transformations. The kernels are presented for the renormalization of light-ray operators built of chiral fields in a particular basis such that the conformal symmetry is manifest. The results can easily be recast in momentum space, in the form of evolution equations for generalized parton distributions.
MPEC 2023-H246 : 2023 HX6
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
subject: 2023 HX6

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.
A Bayesian study of the primordial power spectrum from a novel closed universe model
Creators: name: Vazquez, J. Alberto
name: Lasenby, A. N.
name: Bridges, M.
name: Hobson, M. P.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We constrain the shape of the primordial power spectrum using recent measurements of the cosmic microwave background (CMB) from the Wilkinson Microwave Anisotropy Probe (WMAP) 7-year data and other high-resolution CMB experiments. We also include observations of the matter power spectrum from the luminous red galaxy (LRG) subset DR7 of the Sloan Digital Sky Survey (SDSS). We consider two different models of the primordial power spectrum. The first is the standard nearly scale-invariant spectrum in the form of a generalised power-law parameterised in terms of the spectral amplitude $A_{\rm s}$, the spectral index $n_{\rm s}$ and (possibly) the running parameter $n_{\rm run}$. The second spectrum is derived from the Lasenby and Doran (LD) model. The LD model is based on the restriction of the total conformal time available in a closed Universe and the predicted primordial power spectrum depends upon just two parameters. An important feature of the LD spectrum is that it naturally incorporates an exponential fall-off on large scales, which might provide a possible explanation for the lower-than-expected power observed at low multipoles in the CMB. In addition to parameter estimation, we compare both models using Bayesian model selection. We find there is a significant preference for the LD model over a simple power-law spectrum for a CMB-only dataset, and over models with an equal number of parameters for all the datasets considered.
description: minor corrections to match accepted version to MNRAS
Modified Euler-Heisenberg effective action and Proper-Time Method in Lorentz-Violating Scalar QED
Creators: name: Brito, L. C. T.
name: Felipe, J. C. C.
name: Lehum, A. C.
name: Nascimento, J. R.
name: Petrov, A. Yu.
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Quantum photon effects in vacuum provide an interesting setting to test quantum electrodynamics, serving as a source for predictions about physics beyond the Standard Model. In this paper, we investigate these effects by calculating the one-loop Euler-Heisenberg-like effective action within a Lorentz-violating scalar quantum electrodynamics framework. In both CPT-even and CPT-odd scenarios, we obtain the exact result in all orders of the stress tensor $F_{μν}$ and evaluate explicitly the lower orders of this effective action. We identify the quantum effects coming from Lorentz violation in an explicitly gauge invariant way. Nonlinear Lorentz-violating contributions that may affect photon-photon scattering are explicitly evaluated.
description: 10 pages, version accepted to International Journal of Modern Physics A
Photoredox behavior of a trinuclear Ru(III), Ru(II), Co(III) complex induced by metal-to-metal charge transfer excitations
Creators: name: Kunkely, Horst
name: Pawlowski, V.
name: Vogler, Arnd
Publisher: name: Universität Regensburg
Year: 1994
Subjects: subject: 540 Chemie

description: The trinuclear complex (NH3)5CoIII(μ-NC)CoIII(CN)4(μ-CN)RuII(CN)53− shows a long wavelength absorption near 370 nm which is assigned to a metal-to-metal charge transfer (MMCT) transition from Ru(II) to the central Co(III) ion. Light absorption by this bands leads to a redox decomposition: (NH3)5CoIII(CN)4(μ-CN)RuII(CN)53−→5NH3+ Co2++CoIII(CN)63−+ RuIII(CN)5H2O2−. It is suggested that the initial MMCT transition is followed by a charge shift from the central Co(II) to the cobalt(III) ammine moiety which subsequently undergoes a rapid irreversible decay.