cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
On the origin of the possible chiral spin liquid state of the triangular lattice Hubbard model
Creators: name: Zhang, Qiu
name: Li, Tao
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Recent numerical simulations find a possible chiral spin liquid state in the intermediate coupling regime of the triangular lattice Hubbard model. Here we provide a simple picture for its origin in terms of a Bosonic RVB description. More specifically, we show that such a chiral spin liquid state can be understood as a quantum disordered tetrahedral spin state stabilized by the four spin ring exchange coupling, which suppresses the order-by-disorder effect toward a stripy spin state. Such a chiral spin liquid state features a spin Berry phase of $\fracπ{2}$ per triangle. However, we show that the topological property of such a state is totally missed in the Schwinger Boson mean field description as a result of the lack of Boson rigidity caused by the no double occupancy constraint.
description: 7 pages, 4 figures
The Future of Quark Matter at RHIC
Creators: name: Jacak, Barbara V.
name: McCumber, Michael P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Projected annual results for heavy particle and high-p_{T} correlation studies at future RHICII luminosities.
description: 8 pages, 3 figures. Proceedings for Quark Matter 2006, Shanghai, China
Discovery of the 5 keV cyclotron line followed by three harmonics in SwiftJ1626.6-5156
Creators: name: Molkov, S.
name: Doroshenko, V.
name: Lutovinov, A.
name: Tsygankov, S.
name: Santangelo, A.
name: Mereminskiy, I.
name: Semena, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We report on observations of the Be/X-ray binary system SwiftJ1626.6-5156 performed with NuSTAR during a short outburst in March 2021, following its detection of by the MAXI monitor and Spektrum-Roentgen-Gamma (SRG) observatory. Our analysis of the broadband X-ray spectrum of the source confirms the presence of two absorption-like features at energies ~9 and ~17 keV previously reported in literature and interpreted as the fundamental cyclotron resonance scattering feature (CRSF) and its first harmonic (based on RXTE data). The better sensitivity and energy resolution of NuSTAR, combined with the low energy coverage of NICER, allowed us to detect two additional absorption-like features at ~4.9 keV and ~13 keV. We conclude, therefore, that in total four cyclotron lines are observed in the spectrum of SwiftJ1626.6-5156: the fundamental CRSF at ~4.9 keV and three higher spaced harmonics. This discovery makes SwiftJ1626.6-5156 the second accreting pulsar, after 4U0115+63, whose spectrum is characterized by more than three lines of a cyclotronic origin, and implies the source has the weakest confirmed magnetic field among all X-ray pulsars B~4E11 G. This discovery makes SwiftJ1626.6-5156 one of prime targets for the upcoming X-ray polarimetry missions covering soft X-ray band such as IXPE and eXTP.
Zwölf Briefe (1907-1921) Eduard Fraenkels (1888-1970) an Ulrich von Wilamowitz-Moellendorff (1848-1931)
Creators: name: Dräger, Paul
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Göttinger Forum für Altertumswissenschaft, Bd. 10 (2007): Göttinger Forum für Altertumswissenschaft
Quantum corrections to the classical electrostatic interaction between induced dipoles
Creators: name: Hu, Yongshun
name: Hu, Jiawei
name: Yu, Hongwei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study, in the presence of an external electrostatic field, the interatomic interaction between two ground-state atoms coupled with vacuum electromagnetic fluctuations within the dipole coupling approximation based on the perturbation theory. We show that, up to the fourth order, the electrostatic-field-induced interatomic interaction is just the classical dipole-dipole interaction, which disagrees with the recent result from Fiscelli et al. [G. Fiscelli et al., Phys. Rev. Lett. 124, 013604 (2020)]. However, to higher orders, there exist external-field-related quantum corrections to the induced classical electrostatic dipole-dipole interaction. In the sixth order, the external field effectively modifies the atomic polarizability to give rise to a two-photon-exchange quantum correction, while in the eighth order, the external field enables an additional process of three-photon exchange which is not allowed in the absence of the external field, and this process generates an $r^{-11}$ term in the interaction potential in the far regime, where $r$ is the interatomic separation. Numerical estimations show that these external-field-related quantum corrections are much smaller than the two-photon-exchange Casimir-Polder interaction.
description: 17 pages, 0 figure. Submitted on 07 Apr 2020, accepted on 23 Mar 2021. Published version
Microfluidic velocimetry reveals spatial cooperativity in soft glassy flows
Creators: name: Goyon, J.
name: Colin, A.
name: Ovarlez, G.
name: Ajdari, A.
name: Bocquet, L.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Amorphous glassy materials of diverse nature -- concentrated emulsions, granular materials, pastes, molecular glasses -- display complex flow properties, intermediate between solid and liquid, which are at the root of their use in many applications. A classical feature, well documented yet not really understood, is the very non-linear nature of the flow rule relating stresses and strain rates. Using a microfluidic velocimetry technique, we characterize the flow of thin layers of concentrated emulsions, confined in gaps of different thicknesses by surfaces of different roughness. Beyond the classical non-linearities of the rheological behaviour, we evidence finite size effects in the flow behaviour and the absence of an intrinsic local flow rule. In contrast, a rather simple non-local flow rule is shown to account for all the velocity profiles. This non-locality of the dynamics is quantified by a length, characteristic of the cooperativity of the flow at these scales, that is unobservable in the liquid state (lower concentrations) and that increases with concentration in the jammed state. Beyond its practical importance for applications involving thin layers, e.g. coatings, our assessment of non-locality and cooperativity echoes observations on other glassy, jammed and granular systems, suggesting a possible fundamental universality.
description: Supplementary Information on request; contact: Annie.colin-exterieur@eu.rhodia.com, lyderic.bocquet@univ-lyon1.fr
The Travels of the Infant Paulinus and the Unitarian Character of the 'Eucharisticos'
Creators: name: Coskun, Altay
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Göttinger Forum für Altertumswissenschaft, Bd. 10 (2007): Göttinger Forum für Altertumswissenschaft
Offensive k-alliances in graphs
Creators: name: Fernau, H.
name: Rodriguez, J. A.
name: Sigarreta, J. M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 03D15, 05C69, 05A20

description: Let $G=(V,E)$ be a simple graph. For a nonempty set $X\subset V,$ and a vertex $v\in V,$ $δ_{X}(v)$ denotes the number of neighbors $v$ has in $X.$ A nonempty set $S\subset V$ is an \emph{offensive $r$-alliance} in $G$ if $δ_S(v)\ge δ_{\bar{S}}(v)+r,$ $\forall v\in \partial (S),$ where $\partial (S)$ denotes the boundary of $S$. An offensive $r$-alliance $S$ is called \emph{global} if it forms a dominating set. The \emph{global offensive $r$-alliance number} of $G$, denoted by $γ_{r}^{o}(G)$, is the minimum cardinality of a global offensive $r$-alliance in $G$. We show that the problem of finding optimal (global) offensive $r$-alliances is NP-complete and we obtain several tight bounds on $γ_{r}^{o}(G)$.
Characterizing multiparticle entanglement in symmetric N-qubit states via negativity of covariance matrices
Creators: name: Devi, A. R. Usha
name: Prabhu, R.
name: Rajagopal, A. K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We show that higher order inter-group covariances involving even number of qubits are necessarily positive semidefinite for N qubit separable states, which are completely symmetric under permutations of the qubits. This identification leads to a family of sufficient conditions of inseparability based on the negativity of 2kth order inter-group covariance matrices of symmetric N-qubit systems. These conditions have a simple structure and detect entanglement in all even partitions of the symmetric multiqubit system. The observables involved are feasible experimental quantities and do not demand full state determination through quantum state tomography.
description: 4 pages, no figures, RevTeX, Improved presentation
'… non aetate confectis, non mulieribus, non infantibus pepercerunt': Etude sur le massacre d’Avaricum (BG VII 28)
Creators: name: Reisdoerfer, Joseph
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Göttinger Forum für Altertumswissenschaft, Bd. 10 (2007): Göttinger Forum für Altertumswissenschaft
Heegaard-Floer homology and string links
Creators: name: Roberts, Lawrence
Publisher: name: arXiv
Year: 2006
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics

description: We extend knot Floer homology to string links in D^{2} \times I and to d-based links in arbitrary three manifolds, without any hypothesis on the null-homology of the components. As for knot Floer homology we obtain a description of the Euler characteristic of the resulting homology groups (in D^{2} \times I) in terms of the torsion of the string link. Additionally, a state summation approach is described using the equivalent of Kauffman states. Furthermore, we examine the situtation for braids, prove that for alternating string links the Euler characteristic determines the homology, and develop similar composition formulas and long exact sequences as in knot Floer homology.
description: 57 pages
Poetic Allusion in Plato’s 'Timaeus' and 'Phaedrus'
Creators: name: Pender, E. E.
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Göttinger Forum für Altertumswissenschaft, Bd. 10 (2007): Göttinger Forum für Altertumswissenschaft
Probabilistic signatures of spatiotemporal intermittency in the coupled sine circle map lattice
Creators: name: Jabeen, Zahera
name: Gupte, Neelima
Publisher: name: arXiv
Year: 2008
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: The phase diagram of the coupled sine circle map lattice exhibits a variety of interesting phenomena including spreading regions with spatiotemporal intermittency, non-spreading regions with spatial intermittency, and coherent structures termed solitons. A cellular automaton mapping of the coupled map lattice maps the spreading to non-spreading transition to a transition from a probabilistic to a deterministic cellular automaton. The solitonic sector of the map shows spatiotemporal intermittency with soliton creation, propagation and annihilation. A probabilistic cellular automaton mapping is set up for this sector which can identify each one of these phenomena.
description: 6 pages, 2 figures. Submitted to Pramana-Journal of Physics. To appear in the Proceedings of "Perspectives in Nonlinear Dynamics 2007"
Die 'lex Porcia', das Ehrendekret für Menippos von Kolophon und die römische Provinzverwaltung der 120er Jahre
Creators: name: Daubner, Frank
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Göttinger Forum für Altertumswissenschaft, Bd. 10 (2007): Göttinger Forum für Altertumswissenschaft
Efficient coding/decoding strategies for channels with memory
Creators: name: Lai, Cuong H.
Publisher: name: University of British Columbia
Year: 2008

description: Many digital communication channels are affected by errors that tend to occur in bursts. A great deal of work has been devoted to finding good burst-error-correcting codes and developing burst-error-correcting schemes. However, burst-error-correcting codes are generally useless for long bursts. Some burst-error-correcting schemes suffer long delay in decoding. Others are very sensitive to random errors in the guard space. Most of these schemes are not adaptive to channel conditions. In this thesis, two new schemes are proposed to overcome these drawbacks. The proposed schemes are analyzed over a two state Markovchain channel model. Both schemes employ a combination of two codes. In the first scheme, one of the codes is used for random error correction and for burst detection while the other one is used only for burst recovery. In the second scheme, one of the codes is used for burst detection and for channel state estimation, and both codes are used for error correction. Unlike existing burst-error-correcting schemes, it is shown that the proposed schemes are adaptive to channel conditions and less sensitive to errors in the guard space. For the same delay, the proposed schemes offer better performance than the interleaving schemes. When the channel is heavily corrupted by bursts, the improvement is even more pronounced.
Simplified Quartessence Cosmology
Creators: name: Lima, J. A. S.
name: Cunha, J. V.
name: Alcaniz, J. S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We propose a new class of accelerating world models unifying the cosmological dark sector (dark matter and dark energy). All the models are described by a simplified version of the Chaplygin gas Quartessence cosmology. It is found that even for $Ω_k \neq 0$, this Quartessence scenario depends only on a pair of parameters which can severely be constrained by the cosmological tests. As an example we perform a joint analysis involving the latest SNe type Ia data and the recent Sloan Digital Sky Survey measurement of baryon acoustic oscillations. In our analysis we have considered the SNe type Ia Union sample compiled by Kowalski et al. (2008). At 95.4% (c.l.), we find for BAO + Union sample, $α=0.81^{+0.04}_{-0.04}$ and $Ω_{\rm Q4}=1.15^{+0.16}_{-0.17}$. The best fit for this simplified Quartessence scenario is a spatially closed Universe and its reduced $χ^2$ is exactly the same of the flat concordance model (LambdaCDM)
description: 5 pages, 4 figures. Changes in the abstract and the SNe Union data sample has been considered
Implementation of a force-reflecting telerobotic system with magnetically levitated master and wrist
Creators: name: Wong, Ngai M.
Publisher: name: University of British Columbia
Year: 2008

description: Aspects of control and coordination of a new force-reflecting teleoperation system have been addressed in this thesis. A six-degree-of-freedom magnetically levitated fine-motion device is used as the teleoperation master. The slave system is a redundant coarse-fine manipulator system which consists of a conventional robot equipped with a magnetically levitated fine-motion wrist identical to the master. The environment and the human operator applied forces are measured by two six-axis force-torque sensors. Taking advantage of the Lorentz magnetic levitation technology, the system can eliminate mechanical problems such as friction and backlash, and is able to achieve high frequence response, precise positioning and excellent force-reflection quality. With using rate control for large motion and position control for small motion, the slave system can be controlled over a large workspace by the master without operator controlled indexing and without sacrificing position resolution. An overshoot problem due to time delay in the coarse manipulator position data has been solved by using decoupling coarse-fine control approach, in which the coarse manipulator is only responsible for rate control and the fine-motion wrist is responsible for position control. The system performance was quantified by performing general teleoperation tasks, such as free motion tracking, hard contact and exertion of forces. The teleoperation system has over 15Hz position bandwidth and several kHz force bandwidth. At present, the force bandwidth is limited by computation delays to a few hundredHz (this number will increase with a faster computing system).
Steric quenching of the switchable mirror effect Phys. Rev. B 75, 104109 (2007)
Creators: name: Messina, Troy C.
name: Miller, Casey W.
name: Markert, John T.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Scandium was substituted for yttrium to observe the effect of unit cell size on the optical metal-to-insulator (MIT) transition in the Y_(1-z)Sc_(z)H_(x) alloy system. The optical transmittance decreases significantly for z>0.10. Simultaneous electrical resistivity measurements confirm the transition from trihydride to dihydride behavior with increasing z. These observations imply a quenching of the MIT when the unit cell volume falls below a critical level that is consistent with the boundary between trihydride and non-trihydride forming rare-earth elements. A combinatoric model reveals this formation boundary corresponds to two or more Sc per unit cell.
description: Phys. Rev. B 75, 104109 (2007)
Why the Schwinger Boson mean field theory fails to describe the spin dynamics of the triangular lattice antiferromagnetic Heisenberg model?
Creators: name: Zhang, Qiu
name: Li, Tao
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We find that the Schwinger Boson mean field theory(SBMFT) supplemented with Gutzwiller projection provides an exceedingly accurate description for the ground state of the spin-$\frac{1}{2}$ triangular lattice antiferromagnetic Heisenberg model(spin-$\frac{1}{2}$ TLHAF). However, we find the SBMFT fails even qualitatively in the description of the dynamical behavior of the system. In particular, the SBMFT fails to predict the Goldstone mode in the magnetic ordered phase. We show that the coherent peak in the two-spinon continuum in the presence of spinon condensate should not be interpreted as a magnon mode. The SBMFT also predicts incorrectly a gapless longitudinal spin fluctuation mode in the magnetic ordered phase. We show that these failures are related to the following facts: (1)Spinon condensation fails to provide a consistent description of the order parameter manifold of the 120 degree ordered phase. (2)There lacks in the SBMFT the coupling between the uncondensed spinon and the spinon condensate, which breaks both the spin rotational and the translational symmetry. (3)There lacks in the SBMFT the rigidity that is related to the no double occupancy constraint on the spinon system. We show that such failures of the SBMFT is neither restricted to the spin-$\frac{1}{2}$ TLHAF nor to the magnetic ordered phase. We proposed a generalized SBMFT to resolve the first two issues and a new formalism to address the third issue.
description: 12 pages, 7 figures
Barium even-to-odd isotope abundance ratios in thick disk and thin disk stars
Creators: name: Mashonkina, L.
name: Zhao, G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the Ba even-to-odd isotope abundance ratios in 25 cool dwarf stars with the metallicity [Fe/H] ranged between 0.25 and --1.35. Our method takes advantage of the hyperfine structure (HFS) affecting the \ion{Ba}{ii} resonance line of the odd isotopes. The fractional abundance of the odd isotopes of Ba is derived from a requirement that Ba abundances from the resonance line $λ4554$ and subordinate lines $λ5853$ and $λ6496$ must be equal. The results are based on NLTE line formation and analysis of high resolution (R $\sim60000$) high signal-to-noise (S/N $\ge 200$) observed spectra. We find that the fraction of the odd isotopes of Ba grows toward the lower Ba abundance (or metallicity) and the mean value in the thick disk stars equals 33 $\pm$ 4%. This indicates the higher contribution of the $r-$process to barium in the thick disk stars compared to the solar system matter. The obtained fraction increases with the [Eu/Ba] abundance ratio growth in agreement with expectations. A significant fraction of the \emph{even} isotopes of Ba found in old Galactic stars (the thick disk stars), $\sim67$%, is in contrast to the prediction of the "classical" model of the $s-$process and favors the value predicted by the "stellar" models of Arlandini et al. (1999) and Travaglio et al. (1999).
description: 10 pages, 7 figures, accepted for publication in Astronomy and Astrophysics
Development of Gated Fiber Detectors for Laser-Induced Strong Electromagnetic Pulse Environments
Creators: name: Hu, Po
name: Ma, Zhiguo
name: Zhao, Kai
name: Zhang, Guoqiang
name: Fang, Deqing
name: Wei, Baoren
name: Fu, Changbo
name: Ma, Yugang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: With the development of laser technologies, nuclear reactions can happen in high-temperature plasma environments induced by lasers and have attracted a lot of attention from different physical disciplines. However, studies on nuclear reactions in plasma are still limited by detecting technologies. This is mainly due to the fact that extremely high electromagnetic pulses (EMPs) can also be induced when high-intensity lasers hit targets to induce plasma, and then cause dysfunction of many types of traditional detectors. Therefore, new particle detecting technologies are highly needed. In this paper, we report a recently developed gated fiber detector which can be used in harsh EMP environments. In this prototype detector, scintillating photons are coupled by fiber and then transferred to a gated photomultiplier tube which is located far away from the EMP source and shielded well. With those measures, the EMPs can be avoided, and this device has the capability to identify a single event of nuclear reaction products generated in laser-induced plasma from noise EMP backgrounds. This new type of detector can be widely used as a Time-of-Flight (TOF) detector in high-intensity laser nuclear physics experiments for detecting neutron, photons, and other charged particles.
description: 9 pages; 6 figures
Ernst August Schmidt, Rudolf Borchardts Antike. Heroisch-tragische Zeitgenossenschaft in der Moderne
Creators: name: Eickmeyer, Jost
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Ernst August Schmidt, Rudolf Borchardts Antike. Heroisch-tragische Zeitgenossenschaft in der Moderne. Schriften der philosophisch-historischen Klasse der Heidelberger Akademie der Wissenschaften, Bd. 38. Heidelberg: Winter 2006, 222 S.
description: Göttinger Forum für Altertumswissenschaft, Bd. 11 (2008): Göttinger Forum für Altertumswissenschaft
Gravitational Waves from Phase Transitions at the Electroweak Scale and Beyond
Creators: name: Grojean, Christophe
name: Servant, Geraldine
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: If there was a first order phase transition in the early universe, there should be an associated stochastic background of gravitational waves. In this paper, we point out that the characteristic frequency of the spectrum due to phase transitions which took place in the temperature range 100 GeV - 10^7 GeV is precisely in the window that will be probed by the second generation of space-based interferometers such as the Big Bang Observer (BBO). Taking into account the astrophysical foreground, we determine the type of phase transitions which could be detected either at LISA, LIGO or BBO, in terms of the amount of supercooling and the duration of the phase transition that are needed. Those two quantities can be calculated for any given effective scalar potential describing the phase transition. In particular, the new models of electroweak symmetry breaking which have been proposed in the last few years typically have a different Higgs potential from the Standard Model. They could lead to a gravitational wave signature in the milli-Hertz frequency, which is precisely the peak sensitivity of LISA. We also show that the signal coming from phase transitions taking place at T ~ 1-100 TeV could entirely screen the relic gravitational wave signal expected from standard inflationary models.
description: 18 pages, 24 figures
Dorothee Elm von der Osten, Liebe als Wahnsinn. Die Konzeption der Göttin Venus in den Argonautica des Valerius Flaccus
Creators: name: Schenk, Peter
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Dorothee Elm von der Osten, Liebe als Wahnsinn. Die Konzeption der Göttin Venus in den Argonautica des Valerius Flaccus. Potsdamer Altertumswissenschaftliche Beiträge Bd. 20. Stuttgart: Franz Steiner Verlag 2007, 204 S.
description: Göttinger Forum für Altertumswissenschaft, Bd. 11 (2008): Göttinger Forum für Altertumswissenschaft
Anthropic tuning of the weak scale and of m_u/m_d in two-Higgs-doublet models
Creators: name: Barr, S. M.
name: Khan, Almas
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: It is shown that in a model in which up-type and down-type fermions acquire mass from different Higgs doublets, the anthropic tuning of the Higgs mass parameters can explain the fact that the observed masses of the $d$ and $u$ quarks are nearly the same with $d$ slightly heavier. If Yukawa couplings are assumed not to "scan" (vary among domains), this would also help explain why the t quark is much heavier than the b quark. It is also pointed out that the existence of dark matter invalidates some earlier anthropic arguments against the viability of domains where the Standard Model Higgs has positive $μ^2$, but makes other even stronger arguments possible.
description: 31 pages, 7 figures
The Tayler instability and the Hall effect in protoneutron stars
Creators: name: Ruediger, Guenther
name: Schultz, Manfred
name: Mond, Michael
name: Shalybkov, Dmitry A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Collapse calculations indicate that the hot newly born protoneutron stars (PNS) rotate differentially so that strong toroidal magnetic field components should exist in the outer crust where also the Hall effect appears to be important when the Hall parameter \hatβ=ω_B τis of order unity. The amplitudes of the induced toroidal magnetic fields are limited from above by the Tayler instability. An important characteristic of the Hall effect is its distinct dependence on the {\em sign} of the magnetic field. We find for fast rotation that positive (negative) Hall parameters essentially reduce (increase) the stability domain. It is thus concluded that the toroidal field belts in PNS induced by their differential rotation should have different amplitudes in both hemispheres which later are frozen in. Due to the effect of magnetic suppression of the heat conductivity also the brightness of the two hemispheres should be different. As a possible example for our scenario the isolated neutron star RBS 1223 is considered which has been found to exhibit different X-ray brightness at both hemispheres.
description: 8 pages, 6 figures, submitted to Astron. Nachr
Additional file 20 of A genome variation map provides insights into the genetics of walnut adaptation and agronomic traits
Creators: name: Ji, Feiyang
name: Ma, Qingguo
name: Zhang, Wenting
name: Liu, Jie
name: Feng, Yu
name: Zhao, Peng
name: Song, Xiaobo
name: Chen, Jiaxin
name: Zhang, Junpei
name: Wei, Xin
name: Zhou, Ye
name: Chang, Yingying
name: Zhang, Pu
name: Huang, Xuehui
name: Qiu, Jie
name: Pei, Dong
Publisher: name: figshare
Year: 2021
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file 20. Review history.
Test-beam characterisation of the CLICTD technology demonstrator - a small collection electrode High-Resistivity CMOS pixel sensor with simultaneous time and energy measurement
Creators: name: Ballabriga, R.
name: Buschmann, E.
name: Campbell, M.
name: Dannheim, D.
name: Dort, K.
name: Egidos, N.
name: Huth, L.
name: Kremastiotis, I.
name: Kröger, J.
name: Linssen, L.
name: Llopart, X.
name: Munker, M.
name: Nürnberg, A.
name: Snoeys, W.
name: Spannagel, S.
name: Vanat, T.
name: Vicente, M.
name: Williams, M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The CLIC Tracker Detector (CLICTD) is a monolithic pixel sensor. It is fabricated in a 180 nm CMOS imaging process, modified with an additional deep low-dose n-type implant to obtain full lateral depletion. The sensor features a small collection diode, which is essential for achieving a low input capacitance. The CLICTD sensor was designed as a technology demonstrator in the context of the tracking detector studies for the Compact Linear Collider (CLIC). Its design characteristics are of broad interest beyond CLIC, for HL-LHC tracking detector upgrades. It is produced in two different pixel flavours: one with a continuous deep n-type implant, and one with a segmented n-type implant to ensure fast charge collection. The pixel matrix consists of $16\times128$ detection channels measuring $300 \times 30$ microns. Each detection channel is segmented into eight sub-pixels to reduce the amount of digital circuity while maintaining a small collection electrode pitch. This paper presents the characterisation results of the CLICTD sendor in a particle beam. The different pixel flavours are compared in detail by using the simultaneous time-over-threshold and time-of-arrival measurement functionalities. Most notably, a time resolution down to $(5.8 \pm 0.1)$ ns and a spatial resolution down to $(4.6 \pm 0.2)$ microns are measured. The hit detection efficiency is found to be well above 99.7% for thresholds of the order of several hundred electrons.
Puhuri Deliverable D4 Accounting and Reporting
Creators: name: Edelmann, Erik
name: Nyholm, Juha
name: Saar, Ahti
name: Happonen, Kalle
name: Livenson, Ilja
name: Sjöström, Anders
name: Zaiaev, Sergei
name: Gasels, Jefirms
name: Laitinen, Jarno
name: Engström, Kent
Publisher: name: Zenodo
Year: 2022
Subjects: EuroHPC, Puhuri, NeIC, LUMI, Accounting, Reporting, HPC

description: NeIC Puhuri project deliverable 4 on accounting and reporting. Chapter 1 accounting collection at CSC for LUMI EuroHPC supercomputer Chapter 2 describes the accounting collection in Puhuri Core and reporting in Puhuri Portal and Puhuri statistics portal Chapter 3 reports how SNIC is integrated SUPR portal for accounting
Clifford wavelets for fetal ECG extraction
Creators: name: Jallouli, Malika
name: Arfaoui, Sabrine
name: Mabrouk, Anouar Ben
name: Cattani, Carlo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Medical Physics (physics.med-ph)
subject: Computational Engineering, Finance, and Science (cs.CE)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences
subject: 42C40, 92C55

description: Analysis of the fetal heart rate during pregnancy is essential for monitoring the proper development of the fetus. Current fetal heart monitoring techniques lack the accuracy in fetal heart rate monitoring and features acquisition, resulting in diagnostic medical issues. The challenge lies in the extraction of the fetal ECG from the mother's ECG during pregnancy. This approach has the advantage of being a reliable and non-invasive technique. For this aim, we propose in this paper a wavelet/multi-wavelet method allowing to extract perfectly the feta ECG parameters from the abdominal mother ECG. The method is essentially due to the exploitation of Clifford wavelets as recent variants in the field. We prove that these wavelets are more efficient and performing against classical ones. The experimental results are therefore due to two basic classes of wavelets and multi-wavelets. A first-class is the classical Haar Schauder, and a second one is due to Clifford valued wavelets and multi-wavelets. These results showed that wavelets/multiwavelets are already good bases for the FECG processing, provided that Clifford ones are the best.
description: 21 pages, 8 figures, 1 table
Assessment tools for the career planning of adolescents and adults with neurodevelopmental disorders: a systematic review
Creators: name: Iacomini, Silvia
name: Berardo, Federica
name: Cavallini, Francesca
name: Dipace, Anna
Publisher: name: Journal of Clinical & Developmental Psychology
Year: 2021

description: Background: Vocational outcomes for people with Neurodevelopmental Disorders (ND) are generally limited. When planning a career path for this population, it would seem essential to consider employability as a complex process that is challenging for the individual with ND because it depends on many skills and how they match the work environment. Methods: We systematically reviewed the scientific contributions in the literature describing procedures for assessing work preferences and interests, soft skills and other relevant interpersonal skills, and job matching for adolescents and adults with ND. Specifically, this review aims to explore these assessment strategies to help mental health professionals design a career pathway for people with ND. The Preferred Reporting Items for Systematic Review and Meta-Analyses (PRISMA) guidelines were followed, using PsycInfo, Scopus, Web of Science, and Pub Med. A total of 22 papers were included in the final analysis. Results: The results showed no pre-employment assessment procedures for individuals with ND that are strongly scientifically validated to date. However, an assessment that includes self-report tools and computer-based procedures for assessing work preferences, job matching, and soft skills could help people with ND develop a sense of self-efficacy about their abilities. Conclusions: The results are discussed in terms of implications for professional practice and future research perspectives.
description: Journal of Clinical & Developmental Psychology, Online First Articles
Application of force feedback to heavy duty hydraulic machine
Creators: name: Parker, Niall R.
Publisher: name: University of British Columbia
Year: 2009

description: Issues concerning the design and implementation of a force-reflecting controller for conven tional heavy duty hydraulic machines are addressed in this thesis. A computer simulation of a typical hydraulic machine (a feller/buncher) has been developed. It implements a graphical dis play and a dynamic simulation of the endpoint load. A magnetically levitated joystick has been integrated into the simulator to act as the force-reflecting master. The system has been used to evaluate various control strategies for their effectiveness and subjective feel. These studies have shown that simple rate control wifi be unstable in contact with a surface when direct force feed back is applied, and a novel stiffness control scheme was developed to circumvent this problem. The force-reflecting master was also used with a CAT 215 log loader, and experiments using the system to control the endpoint force were performed. The system was capable of repeatedly applying a desired target force based on force feedback to the operator alone. Large errors in the applied forces were due mainly to the poor resolution of the endpoint force sensing. The cylinder pressures in the main actuators were measured and used to derive the endpoint forces, with resolution on the order of 10% of a typical working load.
Jan Olof Rosenqvist, Die byzantinische Literatur
Creators: name: Schneider, Horst
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Jan Olof Rosenqvist, Die byzantinische Literatur. Berlin/New York: Walter de Gruyter 2006, 239 S.
description: Göttinger Forum für Altertumswissenschaft, Bd. 11 (2008): Göttinger Forum für Altertumswissenschaft
Discovery and timing of three millisecond pulsars in radio and gamma-rays with the GMRT and Fermi-LAT
Creators: name: Bhattacharyya, B.
name: Roy, J.
name: Johnson, T. J.
name: Ray, P. S.
name: Freire, P. C. C.
name: Gupta, Y.
name: Bhattacharya, D.
name: Kaninghat, A.
name: Stappers, B. W.
name: Ferrara, E. C.
name: Sengupta, S.
name: Rathour, R. S.
name: Kerr, M.
name: Smith, D. A.
name: Parkinson, P. M. Saz
name: Ransom, S. M.
name: Michelson, P. F.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We performed deep observations to search for radio pulsations in the directions of 375 unassociated Fermi Large Area Telescope (LAT) gamma-ray sources using the Giant Metrewave Radio Telescope (GMRT) at 322 and 607 MHz. In this paper we report the discovery of three millisecond pulsars (MSPs), PSR J0248+4230, PSR J1207$-$5050 and PSR J1536$-$4948. We conducted follow up timing observations for around 5 years with the GMRT and derived phase coherent timing models for these MSPs. PSR J0248$+$4230 and J1207$-$5050 are isolated MSPs having periodicities of 2.60 ms and 4.84 ms. PSR J1536-4948 is a 3.07 ms pulsar in a binary system with orbital period of around 62 days about a companion of minimum mass 0.32 solar mass. We also present multi-frequency pulse profiles of these MSPs from the GMRT observations. PSR J1536-4948 is an MSP with an extremely wide pulse profile having multiple components. Using the radio timing ephemeris we subsequently detected gamma-ray pulsations from these three MSPs, confirming them as the sources powering the gamma-ray emission. For PSR J1536-4948 we performed combined radio-gamma-ray timing using around 11.6 years of gamma-ray pulse times of arrivals (TOAs) along with the radio TOAs. PSR J1536-4948 also shows evidence for pulsed gamma-ray emission out to above 25 GeV, confirming earlier associations of this MSP with a >10 GeV point source. The multi-wavelength pulse profiles of all three MSPs offer challenges to models of radio and gamma-ray emission in pulsar magnetospheres.
description: 35 pages, 8 Figures, 4 Tables, Accepted for publication in the Astrophysical Journal
Effective supergravity descriptions of superstring cosmology
Creators: name: Van Proeyen, Antoine
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: This text is a review of aspects of supergravity theories that are relevant in superstring cosmology. In particular, it considers the possibilities and restrictions for `uplifting terms', i.e. methods to produce de Sitter vacua. We concentrate on N=1 and N=2 supergravities, and the tools of superconformal methods, which clarify the structure of these theories. Cosmic strings and embeddings of target manifolds of supergravity theories in others are discussed in short at the end.
description: 12 pages, contribution to the proceedings of the 2nd international conference on Quantum Theories and Renormalization Group in Gravity and Cosmology, Barcelona, July 11-15, 2006, Journal of Physics A
Attitudes on Autism: The Impact of Theatre on Stigma
Creators: name: Garber, Melissa S
Publisher: name: Adelphi University Honors College
Year: 2024
Subjects: Gender
Autism Spectrum Disorder
Familiarity
Intervention

description: This longitudinal research project examined whether a live theatrical performance decreased autism stigma among audience members. The research followed a pretest-posttest design, including a survey of audience members right before, within 48 hours, and one month after the performance. We expected that autism stigma would decrease directly after the performance and would persist one month later. Using repeated measures ANCOVAs, we found a trend toward a significant decline in stigma, with trending interactions indicating initial declines only for males and only for those less familiar with the show. By the third wave, stigma scores returned to baseline. Consistent with the existing literature showing that live theatrical performances can decrease mental health stigma, our research indicated that such performances may also decrease autism stigma. However, our study is limited due to the small sample size.
SARS-CoV-2 Antivirals: A Study in Open Science, FAIR Data, and Other Challenges in R&D (BioIT 2021 slides)
Creators: name: Southan, Christopher
Publisher: name: Zenodo
Year: 2021

description: Despite the success of SARS-CoV-2 vaccines, there is a crucial need for new antiviral drugs, especially since the virus is likely to become globally endemic, and the leading target for SARS-CoV-2 antivirals is the M-Protease. This talk will address the history of the SARS-CoV-2 M-Protease as an antiviral drug target and complex research policy issues, including Open Science vs. closed drug development, FAIR data and open access
Steffen Diefenbach, Römische Erinnerungsräume. Heiligenmemoria und kollektive Identitäten im Rom des 3. bis 5. Jahrhunderts n. Chr.
Creators: name: Berndt, Guido M.
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Steffen Diefenbach, Römische Erinnerungsräume. Heiligenmemoria und kollektive Identitäten im Rom des 3. bis 5. Jahrhunderts n. Chr. Millenium-Studien zu Kultur und Geschichte des ersten Jahrtausends n. Chr. Band 11. Berlin/New York: Walter de Gruyter 2007, XI + 635 S.
description: Göttinger Forum für Altertumswissenschaft, Bd. 11 (2008): Göttinger Forum für Altertumswissenschaft
Impact of magneto-rotational instability on grain growth in protoplanetary disks: II. Increased grain collisional velocities
Creators: name: Gong, Munan
name: Ivlev, Alexei V.
name: Akimkin, Vitaly
name: Caselli, Paola
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Turbulence is the dominant source of collisional velocities for grains with a wide range of sizes in protoplanetary disks. So far, only Kolmogorov turbulence has been considered for calculating grain collisional velocities, despite the evidence that turbulence in protoplanetary disks may be non-Kolmogorov. In this work, we present calculations of grain collisional velocities for arbitrary turbulence models characterized by power-law spectra and determined by three dimensionless parameters: the slope of the kinetic energy spectrum, the slope of the auto-correlation time, and the Reynolds number. The implications of our results are illustrated by numerical simulations of the grain size evolution for different turbulence models. We find that for the modeled cases of the Iroshnikov-Kraichnan turbulence and the turbulence induced by the magneto-rotational instabilities, collisional velocities of small grains are much larger than those for the standard Kolmogorov turbulence. This leads to faster grain coagulation in the outer regions of protoplanetary disks, resulting in rapid increase of dust opacity in mm-wavelength and possibly promoting planet formation in very young disks.
description: Accepted by ApJ
Karl-Wilhelm Weeber, Luxus im alten Rom. Die öffentliche Pracht / Rudolf Asskamp – Marijke Brouwer – Jörn Christiansen – Herwig Kenzler – Ludwig Wamser (Hrsg.), Luxus und Dekadenz. Römisches Leben am Golf von Neapel
Creators: name: Piekarski, Dirk
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Karl-Wilhelm Weeber, Luxus im alten Rom. Die öffentliche Pracht. Darmstadt: Primus Verlag 2006, 184 S., 106 Abb. Rezension zu: Rudolf Asskamp – Marijke Brouwer – Jörn Christiansen – Herwig Kenzler – Ludwig Wamser (Hrsg.), Luxus und Dekadenz. Römisches Leben am Golf von Neapel, Ausstellungskatalog Haltern u. a. Mainz: Verlag Philipp von Zabern 2007, XII + 287 S., 315 farbl. und 10 s/w Abb.
description: Göttinger Forum für Altertumswissenschaft, Bd. 11 (2008): Göttinger Forum für Altertumswissenschaft
Butterfly Diagram and Activity Cycles in HR 1099
Creators: name: Berdyugina, S. V.
name: Henry, G. W.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We analyze photometric data of the active RS CVn--type star HR 1099 for the years 1975--2006 with an inversion technique and reveal the nature of two activity cycles of 15--16 yr and 5.3$\pm$0.1 yr duration. The 16 yr cycle is related to variations of the total spot area and is coupled with the differential rotation, while the 5.3 yr cycle is caused by the symmetric redistribution of the spotted area between the opposite stellar hemispheres (flip-flop cycle). We recover long-lived active regions comprising two active longitudes that migrate in the orbital reference frame with a variable rate because of the differential rotation along with changes in the mean spot latitudes. The migration pattern is periodic with the 16 yr cycle. Combining the longitudinal migration of the active regions with a previously measured differential rotation law, we recover the first stellar butterfly diagram without an assumption about spot shapes. We find that mean latitudes of active regions at opposite longitudes change antisymmetrically in the course of the 16 yr cycle: while one active region migrates to the pole, the other approaches the equator. This suggests a precession of the global magnetic field with respect to the stellar rotational axis.
description: ApJL, accepted
Ernst A. Schmidt, Clinamen. Eine Studie zum dynamischen Atomismus der Antike, mit einem Beitrag von Hans Günter Dosch: Spontaneität in der Atomphysik des 20. Jahrhunderts
Creators: name: Rumpf, Lorenz
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Ernst A. Schmidt, Clinamen. Eine Studie zum dynamischen Atomismus der Antike, mit einem Beitrag von Hans Günter Dosch: Spontaneität in der Atomphysik des 20. Jahrhunderts. Schriften der Philosophisch-historischen Klasse der Heidelberger Akademie der Wissenschaften 42. Heidelberg: Winter Verlag 2007, 204 S., 2 Abb.
description: Göttinger Forum für Altertumswissenschaft, Bd. 11 (2008): Göttinger Forum für Altertumswissenschaft
Constraints on the form factors for K --> pi l nu and implications for V_us
Creators: name: Hill, Richard J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Rigorous bounds are established for the expansion coefficients governing the shape of semileptonic K-->pi form factors. The constraints enforced by experimental data from tau-->K pi nu eliminate uncertainties associated with model parameterizations in the determination of |V_us|. The results support the validity of a powerful expansion that can be applied to other semileptonic transitions.
description: 5 pages, 3 figures; references added, version to appear in Phys. Rev. D alongside hep-ex/0608058
Sheila Dillon, Ancient Greek Portrait Sculpture. Contexts, Subjects, and Styles
Creators: name: Piekarski, Dirk
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Sheila Dillon, Ancient Greek Portrait Sculpture. Contexts, Subjects, and Styles. Cambridge: Cambridge University Press 2006, XX + 217 S., 171 Abb.
description: Göttinger Forum für Altertumswissenschaft, Bd. 11 (2008): Göttinger Forum für Altertumswissenschaft