cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
MINDFULNESS AND CONCENTRATION AMONG WUSHU SPECIALTY STUDENTS USING TAI CHI PREPARATION TECHNIQUES
Creators: name: Yang, Jiannan
Publisher: name: ZAP Journal
Year: 2024
Subjects: Tai Chi, mindfulness, concentration, Tai Chi proficiency

description: The study explored Tai Chi as a preparatory technique in Chinese Wushu (kung fu or martial arts) and its correlation with students’ mindfulness levels and concentration levels.  One hundred four students were selected and qualified based on a nonrandomized selection, with the majority falling within the age range of 18–21 years, of which 58.65% were males and 41.35% were females. The descriptive analyses revealed a moderate level of mindfulness among the participants. Who also demonstrated good concentration abilities with moderate variability in scores.

The Tai Chi proficiency scores revealed that most students performed well in Tai Chi, with many achieving outstanding or good proficiency levels. Additionally, correlational analyses revealed significant associations between mindfulness and concentration, concentration and Tai Chi proficiency, and mindfulness and Tai Chi proficiency of Wushu specialty students.

These findings underscore the importance of boosting mindfulness programs, developing strategies, and interventions aimed at improving concentration skills among student athletes, and implementing specialized training sessions and workshops focused on refining Tai Chi techniques and enhancing proficiency levels among Wushu students. Moreover, longitudinal or quasi-experimental studies should be conducted to further investigate the effects of mindfulness training, concentration enhancement strategies, and other related variables on Wushu specialty students.
Generic Weyl phase in the vortex state of quasi-two-dimensional chiral superconductors
Creators: name: Yoshida, Tomohiro
name: Udagawa, Masafumi
Publisher: name: arXiv
Year: 2016
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We study the collective behavior of Majorana modes in the vortex state of chiral $p$-wave superconductors. Away from the isolated vortex limit, the zero-energy Majorana states communicate with each other on a vortex lattice, and form a coherent band structure with non-trivial topological character. We revealed that the topological nature of Majorana bands changes sensitively via quantum phase transitions in the two-dimensional (2D) systems, as sweeping magnetic field or Fermi energy. Through the dimensional reduction, we showed the existence of generic superconducting Weyl phase in a low magnetic field region of quasi-2D-chiral superconductors.
description: 5 pages, 3 figures
MPEC 2023-R186 : 2023 RX7
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 RX7

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.
THROWING BODY MECHANICS AND WELL-BEING AMONG DISCUS THROWING STUDENTS
Creators: name: Li, Zhuowei
Publisher: name: ZAP Journal
Year: 2024
Subjects: throwing body mechanics, well-being, discus throw

description: This study investigated body mechanics, psychological well-being, and discus throw performance of 154 university students enrolled in a Physical Education (PE) course at a university in China during the first semester of AY 2023–2024. A nonrandomized selection process was employed to ensure that participants met predetermined criteria, including enrollment in a PE course involving discus throwing, absence of health conditions, and a minimum trial throw of 20 meters. The majority of participants were male, aged between 18 and 21 years, and comprised sophomores from various schools within the university.

A descriptive analysis of students’ throwing body mechanics revealed a proficient performance level based on the assessed indicators: holding the discus (advanced), approach (proficient), throwing (proficient), and follow-through motion (proficient). Students exhibited moderate agreement with statements related to psychological well-being dimensions, indicating room for improvement. The discus throws performance of students demonstrated good performance but with notable variability among individual performances.

A correlational analysis revealed significant associations between throwing body mechanics and discus throw performance, psychological well-being, and discus throw performance, and throwing body mechanics and psychological well-being.

These findings underscore the importance of holistic approaches to student development, emphasizing both physical and psychological aspects. Targeted interventions aimed at enhancing throwing techniques and promoting psychological well-being could optimize discus throw performance and overall student well-being. This study provides valuable insights for educators and practitioners seeking to optimize athletic performance and holistic student development in university settings.
Antiferromagnetic correlations in two-dimensional fermionic Mott-insulating and metallic phases
Creators: name: Drewes, J. H.
name: Miller, L. A.
name: Cocchi, E.
name: Chan, C. F.
name: Pertot, D.
name: Brennecke, F.
name: Köhl, M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: Near zero temperature, quantum magnetism can non-trivially arise from short-range interactions, but the occurrence of magnetic order depends crucially on the interplay of interactions, lattice geometry, dimensionality and doping. Even though the consequences of this interplay are not yet fully understood, quantum magnetism is believed to be connected to a range of complex phenomena in the solid state, for example, in the context of high-$T_c$ superconductivity and spin liquids in frustrated lattices. Ultracold atomic Fermi gases in optical lattices constitute an experimental system with unrivalled tunability and detection capabilities to explore quantum magnetism by analog quantum simulation. In this work, we study the emergence of antiferromagnetic correlations between ultracold fermionic atoms in two dimensions with decreasing temperature. We determine the magnetic susceptibility of the Hubbard model from simultaneous measurements of the in-situ density of both spin components. At half-filling and strong interactions our data approach the Heisenberg model of localized spins with antiferromagnetic correlations. Moreover, we observe the disappearance of magnetic correlations when the system is doped away from half-filling. Our observation of the dependence of quantum magnetism on doping paves the way for future studies on the emergence of pseudogap and pairing phenomena away from half-filling.
description: 7 pages, 4 figures
MPEC 2023-R187 : 2023 RY7
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 RY7

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.
MPEC 2023-R188 : 2023 RZ7
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 RZ7

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.
High pressure structural, elastic and vibrational properties of green energetic oxidizer ammonium dinitramide
Creators: name: Yedukondalu, N.
name: Ghule, Vikas D.
name: Vaitheeswaran, G.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Ammonium DiNitramide (ADN) is one of the most promising green energetic oxidizers for future rocket propellant formulations. In the present work, we report a detailed theoretical study on structural, elastic, and vibrational properties of the emerging oxidizer under hydrostatic compression using various dispersion correction methods to capture weak intermolecular (van der Waals and hydrogen bonding) interactions. The calculated ground state lattice parameters, axial compressibilities, and equation of state are in good accord with the available experimental results. Strength of intermolecular interactions has been correlated using the calculated compressibility curves and elastic moduli. Apart from this, we also observe discontinuities in the structural parameters and elastic constants as a function of pressure. Pictorial representation and quantification of intermolecular interactions are described by the 3D Hirshfeld surfaces and 2D finger print maps. In addition, the computed infra-red (IR) spectra at ambient pressure reveal that ADN is found to have more hygroscopic nature over Ammonium Perchlorate (AP) due to the presence of strong hydrogen bonding. Pressure dependent IR spectra show blue- and red-shift of bending and stretching frequencies which leads to weakening and strengthening of the hydrogen bonding below and above 5 GPa, respectively. The abrupt changes in the calculated structural, mechanical, and IR spectra suggest that ADN might undergo a first order structural transformation to a high pressure phase around 5-6 GPa. From the predicted detonation properties, ADN is found to have high and low performance characteristics when compared with ammonium based energetic oxidizers and well-known secondary explosives, respectively.
description: 28 pages, 11 figures
On the Modeling of Musical Solos as Complex Networks
Creators: name: Ferretti, Stefano
Publisher: name: arXiv
Year: 2016
Subjects: subject: Sound (cs.SD)
subject: Social and Information Networks (cs.SI)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Notes in a musical piece are building blocks employed in non-random ways to create melodies. It is the "interaction" among a limited amount of notes that allows constructing the variety of musical compositions that have been written in centuries and within different cultures. Networks are a modeling tool that is commonly employed to represent a set of entities interacting in some way. Thus, notes composing a melody can be seen as nodes of a network that are connected whenever these are played in sequence. The outcome of such a process results in a directed graph. By using complex network theory, some main metrics of musical graphs can be measured, which characterize the related musical pieces. In this paper, we define a framework to represent melodies as networks. Then, we provide an analysis on a set of guitar solos performed by main musicians. Results of this study indicate that the presented model can have an impact on audio and multimedia applications such as music classification, identification, e-learning, automatic music generation, multimedia entertainment.
description: to appear in Information Science, Elsevier. Please cite the paper including such information. arXiv admin note: text overlap with arXiv:1603.04979
The Cosmic Microwave Background And Pseudo-Nambu-Goldstone Bosons: Searching For Lorentz Violations In The Cosmos
Creators: name: Leon, David
name: Kaufman, Jonathan
name: Keating, Brian
name: Mewes, Matthew
Publisher: name: arXiv
Year: 2016
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: One of the most powerful probes of new physics is the polarized Cosmic Microwave Background (CMB). The detection of a nonzero polarization angle rotation between the CMB surface of last scattering and today could provide evidence of Lorentz-violating physics. The purpose of this paper is twofold. First we review one popular mechanism for polarization rotation of CMB photons: the pseudo-Nambu-Goldstone boson. Second, we propose a method to use the Polarbear experiment to constrain Lorentz-violating physics in the context of the Standard-Model Extension, a framework to standardize a large class of potential Lorentz-violating terms in particle physics.
Ab-initio study of structural, vibrational and optical properties of solid oxidizers
Creators: name: Yedukondalu, N.
name: Vaitheeswaran, G.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report the structural, elastic and vibrational properties of five ionic-molecular solid oxidizers MNO$_3$ (M = Li, Na, K) and MClO$_3$ (M = Na, K). By treating long range electron-correlation effects, dispersion corrected method leads to more accurate predictions of structural properties and phase stability of KNO$_3$ polymorphs. The obtained elastic moduli show soft nature of these materials and are consistent with Ultrasonic Pulse Echo measurements. We made a complete assignment of vibrational modes which are in good accord with available experimental results. From calculated IR and Raman spectra, it is found that the vibrational frequencies show a red-shift from Li -> Na -> K (Na -> K) and N -> Cl for nitrates (chlorates) due to increase in mass of metal and non-metal atoms, respectively. The calculated electronic structure using recently developed Tran-Blaha modified Becke-Johnson potential show that the materials are wide band gap insulators with predominant ionic bonding between M$^+$ (metal) and NO$_3^-$ /ClO$_3^-$ ions and covalent bonding (N-O and Cl-O) within nitrate and chlorate anionic group. From the calculated optical spectra, we observe that electric-dipole transitions are due to nitrate/chlorate group below 20 eV and cationic transitions occur above 20 eV. The calculated reflectivity spectra are consistent with the available experimental spectra.
description: 32 pages, 8 figures
Gluing of categories and Krull--Schmidt partners
Creators: name: Orlov, Dmitri
Publisher: name: arXiv
Year: 2016
Subjects: subject: Algebraic Geometry (math.AG)
subject: Category Theory (math.CT)
subject: FOS: Mathematics
subject: 14F05, 18E30, 16E45

description: We discuss Krull--Schmidt partners for DG categories and produce bunches of them for smooth projective varieties.
description: 4 pages
Simon von Trier. Zitz von Main. Schlöffel von Hirschberg. Die in Anklagezustand versetzten Mitglieder der Deutschen National-Versammlung in Frankfurt a. M.; [1848]
Creators: name: Bare, Charles de
Publisher: name: Universitätsbibliothek der Ludwig-Maximilians-Universität München
Year: 2018

description: Vorlageform der Veröffentlichungsangabe: Druck u. Verlag von C. Knatz in Frankfurt a/m.
Fractality of wave functions on a Cayley tree: Difference between a tree and a locally tree-like graph without boundary
Creators: name: Tikhonov, K. S.
name: Mirlin, A. D.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We investigate analytically and numerically eigenfunction statistics in a disordered system on a finite Bethe lattice (Cayley tree). We show that the wave function amplitude at the root of a tree is distributed fractally in a large part of the delocalized phase. The fractal exponents are expressed in terms of the decay rate and the velocity in a problem of propagation of a front between unstable and stable phases. We demonstrate a crucial difference between a loopless Cayley tree and a locally tree-like structure without a boundary (random regular graph) where extended wavefunctions are ergodic.
Appendix 1 - A brief illustrative example from Practical advice on variable selection and reporting using AIC
Creators: name: Sutherland, Chris
name: Hare, Darragh
name: Johnson, Paul J.
name: Linden, Daniel W.
name: Montgomery, Robert A.
name: Droge, Egil
Publisher: name: The Royal Society
Year: 2023
Subjects: subject: Ecology
subject: FOS: Biological sciences

description: Analysis of the the text-book well-switching example to illustrate issues surrounding model selection.
Noncircular Outer Disks in Unbarred S0 Galaxies: NGC 502 and NGC 5485
Creators: name: Sil'chenko, Olga K.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Strongly noncircular outer stellar disks have been found in two unbarred SA0 galaxies by analyzing spectroscopic data on the rotation of stars and photometric data on the shape and orientation of the isophotes. In NGC 502, the oval distortion of the disk is manifested as two elliptical rings, the inner and the outer ones, covering wide radial zones between the bulge and the disk and at the outer edge of the stellar disk. Such a structure may be a consequence of the so-called "dry" minor merger - multiple accretion of gas-free satellites. In NGC 5485, the kinematical major axis does not coincide with the orientation of isophotes in the disk-dominated region, and for this galaxy the conclusion about its global triaxial structure is unavoidable.
description: Slightly edited version of the paper published in Astronomy Letters, March issue; with colored figures
Inference of Magnetic Field in the Coronal Streamer Invoking Kink Wave Motions generated by Multiple EUV Waves
Creators: name: Srivastava, A. K.
name: Singh, Talwinder
name: Ofman, Leon
name: Dwivedi, B. N.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Using MHD seismology by observed kink waves, the magnetic field profile of a coronal streamer has been investigated. STEREO-B/EUVI temporal image data on 7 March 2012 shows an evolution of two consecutive EUV waves that interact with the footpoint of a coronal streamer evident in the co-spatial and co-temporal STEREO-B/COR-I observations. The evolution of EUV waves is clearly evident in STEREO-B/EUVI, and its energy exchange with coronal streamer generates kink oscillations. We estimate the phase velocities of the kink wave perturbations by tracking it at different heights of the coronal streamer. We also estimate the electron densities inside and outside the streamer using SSI of polarized brightness images in STEREO-B/COR-1 observations. Taking into account the MHD theory of kink waves in a cylindrical waveguide, their observed properties at various heights, and density contrast of the streamer, we estimate the radial profile of magnetic field within this magnetic structure. Both the kink waves diagnose the exponentially decaying radial profiles of the magnetic field in coronal steamer upto 3 solar radii. Within the limit of uncertainties in the measurements, it is indicated that coronal magnetic field of the streamer varies slowly in time at various heights, although its nature always remains exponentially decaying. It is seen that during the evolution of second kink motion in the streamer, it increases in brightness, and also in areal extent slightly, which may be associated with the decreased photospheric magnetic flux at its footpoint. As a result, the magnetic field profile produced by the second kink wave is reduced within the streamer compared to the one diagnosed by the first one. The precisely estimated magnetic field profiles with the uncertainty less than 10% match well with the empirical profile and various observational estimations of the outer coronal magnetic field.
description: 7 Pages; 6 Figures; Low resolution Figures (in paper) and slightly shortened/edited abstract (in meta-data) are to fulfill the criteria of ARXIV
Blockchain's Inner Mechanisms: Brief overview on Hashing, Encryption, PoW, PoS, NFT, IoT, Cyber Security, Federated Learning and Hashgraph
Creators: name: Kabir, S. Rayhan
Publisher: name: Zenodo
Year: 2023
Subjects: Blockchain
Federated Learning
Hashgraph
Blockchain Olympiad
Distributed Ledger Technology
Blockchain 5.0
Blockchain Evolution
Cryptographic Hash
Proof of Work
Proof of Stake
Non-fungible Token
Cyber Security
Cyber Attacks
Industry 4.0
Industrial IoT

description: This presentation will help in understanding the mechanism of blockchain by discussing how blockchain works, blockchain architecture, and blockchain-related components.
Direct illumination calibration of telescopes at the quantum precision limit
Creators: name: Barrelet, E.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The electronic response of a telescope under direct illumination by a point-like light source is based on photon counting. With the data obtained using the SNDICE light source and the Megacam camera on the CFHT telescope, we show that the ultimate precision is only limited by the photon statistical fluctuation, which is below 1 ppm. A key feature of the analysis is the incorporation of diffuse light that interferes with specularly reflected light in the transmission model to explain the observed diffraction patterns. The effect of diffuse light, usually hidden conveniently in the Strehl ratio for an object at infinity, is characterized with a precision of 10 ppm. In particular, the spatial frequency representation provides some strong physical constraints and a practical monitoring of the roughness of various optical surfaces.
description: accepted for publication in Astronomy & Astrophysics
Superradiant laser: Effect of long-ranged dipole-dipole interaction
Creators: name: Jen, H. H.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We theoretically investigate the effect of long-ranged dipole-dipole interaction (LRDDI) on a superradiant laser (SL). This effect is induced from the atom-photon interaction in the dissipation process. In the bad-cavity limit usually performed to initiate SL, we demonstrate that cavity photon number oscillates as an inter-particle distance of the atoms varies. Similarly the atom-atom coherence alternates with signs, showing critical transitions alternatively in SL operations. This suggests a complexity of the collective effect emerging in a large ensemble of atoms. Therefore this effect in a SL can not be simply interpreted by only a part of the whole ensemble. We numerically solve for a steady state SL including the spatially-dependent LRDDI, and locate the maximal cavity photon number and the minimal spectral linewidth respectively at the optimal atomic separations in the setting of an equidistant atomic array. The scaling of a finite number of atoms shows an outperformed steady state SL than the one without LRDDI, which allows for probing narrow atomic transitions and is potentially useful for precision measurements and next generation optical clocks.
description: 6 figures
Leading order relativistic corrections to the dipole polarizability of the hydrogen molecular ions
Creators: name: Aznabayev, D. T.
name: Bekbaev, A. K
name: Zhaugasheva, S. A.
name: Korobov, V. I.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: The static dipole polarizability for the hydrogen molecular ions H$_2^+$, HD$^+$, and D$_2^+$ are calculated. These new data for polarizability takes into account the leading order relativistic corrections to the wave function of the three-body system resulted from the Breit-Pauli Hamiltonian of $mα^4$ order. Our study covers a wide range of rotational ($L=0-5$) and vibrational ($v=0-10$) states, which are of practical interest for precision spectroscopy of the hydrogen molecular ions.
Superprocesses on ultradistributions
Creators: name: Mendes, R. Vilela
Publisher: name: arXiv
Year: 2016
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: Stochastic solutions provide new rigorous results for nonlinear PDE's and, through its local non-grid nature, are a natural tool for parallel computation. There are two different approaches for the construction of stochastic solutions: McKean's and superprocesses. In favour of superprocesses is the fact that they handle arbitrary boundary conditions. However, when restricted to measures, superprocesses can only be used to generate solutions for a limited class of nonlinear PDE's. A new class of superprocesses, namely superprocesses on ultradistributions, is proposed to extend the stochastic solution approach to a wider class of PDE's.
description: 14 pages. arXiv admin note: text overlap with arXiv:1209.3263
Combining configuration interaction with perturbation theory for atoms with large number of valence electrons
Creators: name: Dzuba, V. A.
name: Berengut, J.
name: Harabati, C.
name: Flambaum, V. V.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: A version of the configuration interaction (CI) method is developed which treats highly excited many-electron basis states perturbatively, so that their inclusion does not affect the size of the CI matrix. This removes, at least in principle, the main limitation of the CI method in dealing with many-electron atoms or ions. We perform calculations of the spectra of iodine and its ions, tungsten, and ytterbium as examples of atoms with open $s$, $p$, $d$ and $f$-shells. Good agreement of the calculated data with experiment illustrates the power of the method. Its advantages and limitations are discussed.
description: 10 papges, 1 figure, 5 tables
Local equivalence of representations of Diff$^+(S^1)$ corresponding to different highest weights
Creators: name: Weiner, Mihály
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mathematical Physics (math-ph)
subject: Operator Algebras (math.OA)
subject: Representation Theory (math.RT)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 81R10

description: Let $c,h$ and $c,\tilde{h}$ be two admissible pairs of central charge and highest weight for ${\rm Diff}^+(S^1)$. It is shown here that the positive energy irreducible projective unitary representations $U_{c,h}$ and $U_{c,\tilde{h}}$ of the group ${\rm Diff}^+(S^1)$ are locally equivalent. This means that for any $I\Subset S^1$ open proper interval, there exists a unitary operator $W_I$ such that $W_I U_{c,h}(γ)W_I^* = U_{c,\tilde{h}}(γ)$ for all $γ\in {\rm Diff}^+(S^1)$ which act identically on $I^c\equiv S^1\setminus I$ (i.e. which can "displace" or "move" points only in $I$). This result extends and completes earlier ones that dealt with only certain regions of the "$c,h$-plane", and closes the gap in the full classification of superselection sectors of Virasoro nets.
description: 15 pages, no figures
Spin liquid and quantum phase transition without symmetry breaking in a frustrated three-dimensional Ising model
Creators: name: Roechner, J.
name: Balents, L.
name: Schmidt, K. P.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We show that the highly frustrated transverse-field Ising model on the three-dimensional pyrochlore lattice realizes a first-order phase transition without symmetry breaking between the low-field Coulomb quantum spin liquid and the high-field polarized phase. The quantum phase transition is located quantitively by comparing low- and high-field series expansions. Furthermore, the intriguing properties of the elementary excitations in the polarized phase are investigated. We argue that this model can be achieved experimentally by applying mechanical strain to a classical spin ice material comprised of non-Kramers spins such as Ho_2Ti_2O_7. Taken together with our results, this provides a new experimental platform to study quantum spin liquid physics.
description: 5 pages, 4 figures
Improved Direct Measurement of the 64.5 keV Resonance Strength in the 17O(p,a)14N Reaction at LUNA
Creators: name: Bruno, C. G.
name: Scott, D. A.
name: Aliotta, M.
name: Formicola, A.
name: Best, A.
name: Boeltzig, A.
name: Bemmerer, D.
name: Broggini, C.
name: Caciolli, A.
name: Cavanna, F.
name: Ciani, G. F.
name: Corvisiero, P.
name: Davinson, T.
name: Depalo, R.
name: Di Leva, A.
name: Elekes, Z.
name: Ferraro, F.
name: Fueloep, Zs.
name: Gervino, G.
name: Guglielmetti, A.
name: Gustavino, C.
name: Gyurky, Gy.
name: Imbriani, G.
name: Junker, M.
name: Menegazzo, R.
name: Mossa, V.
name: Pantaleo, F. R.
name: Piatti, D.
name: Prati, P.
name: Somorjai, E.
name: Straniero, O.
name: Strieder, F.
name: Szucks, T.
name: Takacs, M. P.
name: Trezzi, D.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The $^{17}$O(p,$α$)$^{14}$N reaction plays a key role in various astrophysical scenarios, from asymptotic giant branch stars to classical novae. It affects the synthesis of rare isotopes such as $^{17}$O and $^{18}$F, which can provide constraints on astrophysical models. A new direct determination of the $E_{\rm R}~=~64.5$~keV resonance strength performed at the Laboratory for Underground Nuclear Astrophysics accelerator has led to the most accurate value to date, $ωγ= 10.0 \pm 1.4_{\rm stat} \pm 0.7_{\rm syst}$~neV, thanks to a significant background reduction underground and generally improved experimental conditions. The (bare) proton partial width of the corresponding state at $E_{\rm x} = 5672$~keV in $^{18}$F is $Γ_{\rm p} = 35 \pm 5_{\rm stat} \pm 3_{\rm syst}$~neV. This width is about a factor of 2 higher than previously estimated thus leading to a factor of 2 increase in the $^{17}$O(p,$α$)$^{14}$N reaction rate at astrophysical temperatures relevant to shell hydrogen-burning in red giant and asymptotic giant branch stars. The new rate implies lower $^{17}$O/$^{16}$O ratios, with important implications on the interpretation of astrophysical observables from these stars.
Evolution of superconducting gap anisotropy in hole-doped 122 iron pnictides
Creators: name: Platt, Christian
name: Li, Gang
name: Fink, Mario
name: Hanke, Werner
name: Thomale, Ronny
Publisher: name: arXiv
Year: 2016
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Motivated by recent experimental findings, we investigate the evolution of the superconducting gap anisotropy in 122 iron pnictides as a function of hole doping. Employing both a functional and a weak coupling renormalization group approach (FRG and WRG), we analyse the Fermi surface instabilities of an effective 122 model band structure at different hole dopings x, and derive the gap anisotropy from the leading superconducting instability. In the transition regime from collinear magnetism to s_{\pm}-wave, where strong correlations are present, we employ FRG to identify a non- monotonous change of the gap anisotropy in qualitative agreement with new experimental findings. From the WRG, which is asymptotically exact in the weak coupling limit, we find an s_{\pm}-wave to d-wave transition as a function of hole doping, complementing previous findings from FRG [Thomale et al., Phys. Rev. Lett. 107, 117001 (2011)]. The gap anisotropy of the s_{\pm}-wave monotonously increases towards the transition to d-wave as a function of x.
Photogrammetric Documentation and Phasing of a Rock-Carving Gallery at Al-Ḥumaymah.
Creators: Reeves, M. Barbara
Harvey, Craig A.
Publisher: name: University of Alberta Library
Year: 2021

The 2014 season of the al-Ḥumaymah Excavation Project was devoted to surveying rock-carved graffiti and other human activity areas on Jabal Kalkhah and the sandstone ridges west of al-Ḥumaymah’s Nabataean through early Islamic settlements (Reeves, Harvey and Seymour 2018). In the course of this survey, a local resident, Swaylem al Manaja, directed our attention to a natural sandstone pavement on the slopes of Jabal Kalkhah that was covered in more than a hundred rock-carved images and texts.
Dissipation effects in mechanics and thermodynamics
Creators: name: Guemez, Julio
name: Fiolhais, Manuel
Publisher: name: arXiv
Year: 2016
Subjects: subject: Classical Physics (physics.class-ph)
subject: Physics Education (physics.ed-ph)
subject: FOS: Physical sciences

description: With the discussion of three examples, we aim at clarifying the concept of energy transfer associated with dissipation in mechanics and in thermodynamics. The dissipation effects due to dissipative forces, such as the friction force between solids or the drag force in motions in fluids, lead to an internal energy increase of the system and/or to a heat transfer to the surrounding. This heat flow is consistent with the second law, which states that the entropy of the universe should increase when those forces are present because of the irreversibility always associated with their actions. As far as mechanics is concerned the effects of the dissipative forces are include in the Newton's equations as impulses and pseudo-works.
description: 18 pages, 3 figures
A microscopic model for the magnetic field driven breakdown of the dissipationless state in the integer and fractional quantum Hall effect
Creators: name: Poux, A.
name: Wasilewski, Z. R.
name: Friedland, K. J.
name: Hey, R.
name: Ploog, K. H.
name: Airey, R.
name: Plochocka, P.
name: Maude, D. K.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Intra Landau level thermal activation, from localized states in the tail, to delocalized states above the mobility edge in the same Landau level, explains the $B_c(T)$ (half width of the dissipationless state) phase diagram for a number of different quantum Hall samples with widely ranging carrier density, mobility and disorder. Good agreement is achieved over $2-3$ orders of magnitude in temperature and magnetic field for a wide range of filling factors. The Landau level width is found to be independent of magnetic field. The mobility edge moves, in the case of changing Landau level overlap to maintain a sample dependent critical density of states at that energy. An analysis of filling factor $ν=2/3$ shows that the composite Fermion Landau levels have exactly the same width as their electron counterparts. An important ingredient of the model is the Lorentzian broadening with long tails which provide localized states deep in the gap which are essential in order to reproduce the robust high temperature $B_c(T)$ phase observed in experiment.
description: 15 pages, 12 figures
Floquet theory of radical pairs in radiofrequency magnetic fields
Creators: name: Hiscock, Hamish G.
name: Kattnig, Daniel R.
name: Manolopoulos, David E.
name: Hore, P. J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We present a new method for calculating the product yield of a radical pair recombination reaction in the presence of a weak time-dependent magnetic field. This method successfully circumvents the computational difficulties presented by a direct solution of the Liouville-von Neumann equation for a long-lived radical pair containing many hyperfine-coupled nuclear spins. Using a modified formulation of Floquet theory, treating the time-dependent magnetic field as a perturbation, and exploiting the slow radical pair recombination, we show that one can obtain a good approximation to the product yield by considering only nearly-degenerate sub-spaces of the Floquet space. Within a significant parameter range, the resulting method is found to give product yields in good agreement with exact quantum mechanical results for a variety of simple model radical pairs. Moreover it is considerably more efficient than the exact calculation, and it can be applied to radical pairs containing significantly more nuclear spins. This promises to open the door to realistic theoretical investigations of the effect of radiofrequency electromagnetic radiation on the photochemically induced radical pair recombination reactions in the avian retina which are believed to be responsible for the magnetic compass sense of migratory birds.
description: 11 pages, 7 figures
Search for a stochastic gravitational wave background at 1-5 Hz with Torsion-bar Antenna
Creators: name: Kuwahara, Yuya
name: Shoda, Ayaka
name: Eda, Kazunari
name: Ando, Masaki
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We set the first upper limit on the stochastic gravitational wave (GW) background in the frequency range of $1-5\,\mathrm{Hz}$ using a Torsion-bar Antenna (TOBA). A TOBA is a GW detector designed for the detection of low frequency GWs on the ground, with two orthogonal test masses rotated by the incident GWs. We performed a 24-hour observation run using the TOBA and set upper limits, based on frequentist statistics and Bayesian statistics. The most stringent values are $Ω_\mathrm{gw}h_0^2 \leq 6.0 \times10^{18}$ (frequentist) and $Ω_\mathrm{gw}h_0^2 \leq 1.2 \times 10^{20}$ (Bayesian) both at $2.58\,\mathrm{Hz}$, where $h_0$ is the Hubble constant in units of $100\,\mathrm{km/s/Mpc}$ and $Ω_\mathrm{gw}$ is the GW energy density per logarithmic frequency interval in units of the closure density.
description: 5 pages, 6 figures
Localized defect states in MoS$_2$ monolayers: electronic and optical properties
Creators: name: Kunstmann, Jens
name: Wendumu, Tsegabirhan B.
name: Seifert, Gotthard
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Defects usually play an important role in tuning and modifying various properties of semiconducting or insulating materials. Therefore we study the impact of point and line defects on the electronic structure and optical properties of MoS2 monolayers using density-functional methods. The different types of defects form electronic states that are spatially localized on the defect. The strongly localized nature is reflected in weak electronic interactions between individual point or line defect and a weak dependence of the defect formation energy on the defect concentration or line defect separation. In the electronic energy spectrum the defect states occur as deep levels in the band gap, as shallow levels very close to the band edges, as well as levels in-between the bulk states. Due to their strongly localized nature, all states of point defects are sharply peaked in energy. Periodic line defects form nearly dispersionless one-dimensional band structures and the related spectral features are also strongly peaked. The electronic structure of the monolayer system is quite robust and it is well preserved for point defect concentrations of up to 6%. The impact of point defects on the optical absorption for concentrations of 1% and below is found to be very small. For higher defect concentrations molybdenum vacancies were found to quench the overall absorption and sulfur defects lead to sharp absorption peaks below the absorption edge of the ideal monolayer. For line defects, we did not find a considerable impact on the absorption spectrum. These results support recent experiments on defective transition metal chalcogenides.
description: 20 pages, 7 figures, 2 tables
In Memoriam Carlos Julio Rosales (1929 - 2021)
Creators: name: Rosales-Amado, Ligia Carolina
name: Savini-Palumbo, Vilma
Publisher: name: Zenodo
Year: 2022
Subjects: Entomología
Venezuela
plagas forestales
Isoptera
Diptera
Coleoptera

description: Nació en su casa, en el páramo El Sorure, La Grita, estado Táchira, Venezuela,  el 9 de enero de 1929.  Después de culminar su estudios de primaria en La Grita, inició su bachillerato en el liceo Simón Bolívar de San Cristóbal, estado Táchira y lo finalizó  en el liceo Andrés Bello, en Caracas, Distrito Capital. En 1948 comenzó sus estudios  de ingeniería agronómica en la Universidad Central de Venezuela (UCV), en la Hacienda Sosa en El Valle, Caracas.  En 1951 la UCV es cerrada  por el Ejecutivo Nacional,  por esto, viaja a Brasil y realiza el último año de su carrera en la Escuela Nacional de Agronomía de la Universidad Rural de Río de Janeiro donde en 1952 recibe su título de Ingeniero Agrónomo. Regresa a país en 1953. Ya reanudadas las actividades en la UCV, revalida su título  e ingresa como profesor de Entomología General y Entomología Económica en la Facultad de Agronomía. Además, fue director del Instituto de Zoología Agrícola y miembro electo del Consejo de Facultad, en varios períodos para ambos casos; integró numerosas comisiones del Instituto de Zoología Agrícola,  como de la Facultad de Agronomía.

En 1965 junto al Dr. Francisco Fernández Yépez, fundan la cátedra en Entomología en la Universidad de Oriente, Jusepín, estado Monagas. Fue Miembro fundador y, luego, miembro honorario de la Sociedad Venezolana de Entomología. Igualmente, fue asesor de la Corporación Venezolana de Guayana (CVG) y de Desarrollos Forestales San Carlos (Deforsa). Esta labor la efectuó con ahínco y dedicación por años, lo que le permitió convertirse en la máxima autoridad del país para los insectos plaga forestales. En reconocimiento a esta relevante labor en el área forestal, el Laboratorio de Entomología de Deforsa lleva su nombre “Carlos Rosales”. Realizó viajes de estudios de colecciones de insectos en varios museos, destacando: Museo Británico de Londres (Inglaterra); Museo de París (Francia); Museo Real de Ciencias Naturales (Bruselas, Bélgica); Museo Nacional de Historia Natural (Washington, USA); Departamento de Agricultura de los Estados Unidos (Maryland, USA) y Museo Americano de Historia Natural (New York, USA).

 (Versión completa en archivo anexo)
On Quasinormal Modes for Scalar Perturbations of Static Spherically Symmetric Black Holes in Nash Embedding Framework
Creators: name: Ulhoa, S. C.
name: Amorim, R. G. G.
name: Capistrano, Abraão J. S.
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this paper we investigate scalar perturbations of black holes embedded in a five dimensional bulk space. It is calculated the quasinormal frequencies of a such black holes using the third order of Wentzel, Kramers, Brillouin (WKB) approximation for scalar perturbations. The results are presented in tables along the text.
ALMA Observations of HCN and its Isotopologues on Titan
Creators: name: Molter, Edward M.
name: Nixon, Conor A.
name: Cordiner, Martin A.
name: Serigano, Joseph
name: Irwin, Patrick G. J.
name: Teanby, Nicholas A.
name: Charnley, Steven B.
name: Lindberg, Johan E.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We present sub-millimeter spectra of HCN isotopologues on Titan, derived from publicly available ALMA flux calibration observations of Titan taken in early 2014. We report the detection of a new HCN isotopologue on Titan, H$^{13}$C$^{15}$, and confirm an earlier report of detection of DCN. We model high signal-to-noise observations of HCN, H$^{13}$CN, HC$^{15}$N, DCN, and H$^{13}$C$^{15}$ to derive abundances and infer the following isotopic ratios: $^{12}$C/$^{13}$C = 89.8 $\pm$ 2.8, $^{14}$N/$^{15}$N = 72.3 $\pm$ 2.2, D/H = (2.5 $\pm$ 0.2)$\times$10$^{-4}$, and HCN/H$^{13}$C$^{15}$ = 5800 $\pm$ 270 (1$σ$ errors). The carbon and nitrogen ratios are consistent with and improve on the precision of previous results, confirming a factor of $\sim$2.3 elevation in $^{14}$N/$^{15}$N in HCN compared to N$_2$ and a lack of fractionation in $^{12}$C/$^{13}$C from the protosolar value. This is the first published measurement of D/H in a nitrile species on Titan, and we find evidence for a factor of $\sim$2 deuterium enrichment in hydrogen cyanide compared to methane. The isotopic ratios we derive may be used as constraints for future models to better understand the fractionation processes occurring in Titan's atmosphere.
description: Accepted for publication in Astrophysical Journal Letters. 14 pages, 3 figures, 2 tables
title: Πειραματική μελέτη παραδιακλαδωμένων πιεζοηλεκτρικών κυκλωμάτων για την απόσβεση μηχανικών ταλαντώσεων

title: Experimental investigation of shunted piezoelectric circuits for the damping of mechanical oscillations
Creators: name: Λαντζουρακης Εμμανουηλ
Publisher: name: Technical University of Crete
Year: 2023

description: Στην παρούσα διπλωματική μελετάται πειραματικά η χρήση παραδιακλαδωμένων πιεζοηλεκτρικών κυκλωμάτων για την απόσβεση μηχανικών ταλαντώσεων. Οι μηχανικές ταλαντώσεις είναι ένα σύνηθες φαινόμενο σε διάφορα μηχανολογικά συστήματα και μπορούν να οδηγήσουν σε κραδασμούς, θορύβους και μειωμένη απόδοση.
Για την αντιμετώπιση αυτών των ζητημάτων, τα πιεζοηλεκτρικά συστήματα και οι εφαρμογές τους έχουν κεντρίσει το ενδιαφέρων πολλών ερευνών καθώς αποτελούν μια πολλά υποσχόμενη μέθοδο για την απόσβεση των μηχανικών ταλαντώσεων. Ο στόχος αυτής της πειραματικής μελέτης είναι να διερευνηθεί η αποτελεσματικότητα των πιεζοηλεκτρικών παραδιακλαδωμένων κυκλωμάτων στην απόσβεση αυτών των ταλαντώσεων.
Στη διπλωματική περιλαμβάνεται βασική θεωρία των πιεζοηλεκτρικών, των παραδιακλαδωμένων και του τρόπου που μπορούν να χρησιμοποιηθούν για την απόσβεση ταλαντώσεων καθώς και η διεξαγωγή και τα αποτελέσματα του πειράματος.
Τα πειραματικά αποτελέσματα αποδεικνύουν την αποτελεσματικότητα των πιεζοηλεκτρικών παραδιακλαδωμένων κυκλωμάτων στη απόσβεση των μηχανικών ταλαντώσεων.
description: In this thesis, the use of shunted piezoelectric circuits for the damping of mechanical oscillations is studied experimentally. Mechanical oscillations are a common phenomenon in various mechanical systems and can lead to vibration, noise and reduced performance.
To address these issues, piezoelectric systems and their applications have attracted the interest of many researches as they are a promising method for damping mechanical oscillations. The objective of this experimental study is to investigate the effectiveness of piezoelectric shunt circuits in damping these oscillations.
This thesis includes the basic theory of piezoelectrics, shunts and how they can be used to damp oscillations as well as the conduct and the results of the experiment.
The experimental results demonstrate the effectiveness of shunt piezoelectric circuits in the damping of mechanical oscillations.
Walksat stalls well below the satisfiability threshold
Creators: name: Coja-Oghlan, Amin
name: Haqshenas, Amir
name: Hetterich, Samuel
Publisher: name: arXiv
Year: 2016
Subjects: subject: Combinatorics (math.CO)
subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 68Q87 (primary), 68W40 (secondary)

description: Partly on the basis of heuristic arguments from physics it has been suggested that the performance of certain types of algorithms on random $k$-SAT formulas is linked to phase transitions that affect the geometry of the set of satisfying assignments. But beyond intuition there has been scant rigorous evidence that "practical" algorithms are affected by these phase transitions. In this paper we prove that \walksat, a popular randomised satisfiability algorithm, fails on random $k$-SAT formulas not very far above clause/variable density where the set of satisfying assignments shatters into tiny, well-separated clusters. Specifically, we prove \walksat\ is ineffective with high probability if $m/n>c2^k\ln^2k/k$, where $m$ is the number of clauses, $n$ is the number of variables and $c>0$ is an absolute constant. By comparison, \walksat\ is known to find satisfying assignments in linear time \whp\ if $m/n0$ [Coja-Oghlan and Frieze, SIAM J.\ Computing 2014].