cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Motion sequence criteria for favorable occupant kinematics in rear impacts
Creators: name: Viano, David C.
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Pharmacology
subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: Ecology
subject: 69999 Biological Sciences not elsewhere classified
subject: Marine Biology
subject: Science Policy

description: Rear-impact restraint guidelines have not developed to the same degree as for frontal crashes. This study provides criteria for favorable occupant kinematics in rear impacts. Rear criteria were developed as an extension of Adomeit and Heger (1975) and Adomeit (1977) motion sequence criteria (MSC) for favorable occupant kinematics in frontal crashes. In this study, occupant kinematics in rear sled tests were studied to develop motion sequence criteria for favorable and unfavorable occupant kinematics in rear impacts with containment of the hip on the seat and no ramping up the seatback. Rear MSC limit the angle of the torso (α) rearward of vertical to less than the critical angle (αc) for ramping up the seatback and H-pt displacement rearward and downward, so zHpt < zHpt0, where zHpt0 is the initial height of the H-pt. The lateral displacement of the occupant is limited to less than the critical lateral displacement yT1c, where the head becomes unsupported by the head restraint or the chest by the seatback. The rear MSC contain the pelvis on the seat and provide uniform support of the torso, head and neck. Most front seats in production provide reasonably favorable occupant kinematics in rear impacts up to 40 km/h (25 mph) delta V with the 50th Hybrid III. Kinematics become unfavorable in testing at higher severities and with heavier occupants. The amount of energy that the seat needs to transfer to the occupant in a rear impact depends on the delta V (ΔV or change in velocity) of the vehicle and the mass of the occupant (m) among other variables. The seat provides an interface with the occupant and transfers energy (E), which can be approximated by E = ½*0.7*m(ΔV)2 using 70% of the occupant mass (m) and delta V. Rear MSC provide performance guidelines to advance seat designs with favorable occupant kinematics at higher energy transfer levels in rear impacts. Sled testing at 40 km/h (25 mph) involves an energy transfer of 3,421 J with the 50th Hybrid III generally gives favorable kinematics. A 56.3 km/h (35 mph) test involves 6,704 J, double the energy transfer and often unfavorable kinematics. A target energy needs to be set, and there are practical limits because the energy transfer is 12,858 J with a 150 kg (330 lb) occupant in a 56.3 km/h (35 mph) delta V rear crash. Rear motion sequence criteria (MSC) define favorable kinematics in rear impacts. MSC complement the assessment of biomechanical responses in sled and crash testing to ensure an overall evaluation of occupant restraint in rear impacts.
Magnetic contribution to dilepton production in heavy-ion collisions
Creators: name: Tuchin, Kirill
Publisher: name: arXiv
Year: 2013
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We calculate a novel "magnetic contribution" to the dilepton spectrum in heavy-ion collisions arising from interaction of relativistic quarks with intense magnetic field. Synchrotron radiation by quarks, which can be approximated by the equivalent photon flux, is followed by dilepton decay of photons in intense magnetic field. We argue that "magnetic contribution" dominates the dilepton spectrum at low lepton energies, whereas a conventional photon dilepton decay dominates at higher lepton energies.
description: 15 pages, 5 figures
Hypercritical Accretion onto a Newborn Neutron Star and Magnetic Field Submergence
Creators: name: Bernal, Cristian G.
name: Page, Dany
name: Lee, William H.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present magnetohydrodynamic numerical simulations of the late post-supernova hypercritical accretion to understand its effect on the magnetic field of the new-born neutron star. We consider as an example the case of a magnetic field loop protruding from the star's surface. The accreting matter is assumed to be non magnetized and, due to the high accretion rate, matter pressure dominates over magnetic pressure. We find that an accretion envelope develops very rapidly and once it becomes convectively stable the magnetic field is easily buried and pushed into the newly forming neutron star crust. However, for low enough accretion rates the accretion envelope remains convective for an extended period of time and only partial submergence of the magnetic field occurs due to a residual field that is maintained at the interface between the forming crust and the convective envelope. In this latter case, the outcome should be a weakly magnetized neutron star with a likely complicated field geometry. In our simulations we find the transition from total to partial submergence to occur around dotM ~ 10 M_sun/yr. Back-diffusion of the submerged magnetic field toward the surface, and the resulting growth of the dipolar component, may result in a delayed switch-on of a pulsar on time-scales of centuries to millenia.
description: 11 pages, 10 figures
title: Research on the use of Digital Tools by STEM Students at the University of Rijeka
Creators: name: Durovic, Gordan
name: Holenko Dlab, Martina
name: Hoic-Bozic, Natasa
Publisher: name: TEM Journal
Year: 2019

description: The use of digital tools for learning has the potential to positively affect student motivation. While exploring the extent of use of digital tools for learning by STEM students at the University of Rijeka, it was observed that the current level of use is not at the expected level. Obtained research results have shown that surveyed STEM students are currently not encouraged nor intrinsically motivated enough to explore the possibilities of using freely available digital tools for learning. With the aim of influencing student motivation, we propose building an evaluation system in STEM education based on the principles of Educational Recommender System.
Large Radio Telescopes for Anomalous Microwave Emission Observations
Creators: name: Battistelli, E. S.
name: Carretti, E.
name: de Bernardis, P.
name: Masi, S.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: We discuss in this paper the problem of the Anomalous Microwave Emission (AME) in the light of ongoing or future observations to be performed with the largest fully steerable radio telescope in the world. High angular resolution observations of the AME will enable astronomers to drastically improve the knowledge of the AME mechanisms as well as the interplay between the different constituents of the interstellar medium in our galaxy. Extragalactic observations of the AME have started as well, and high resolution is even more important in this kind of observations. When cross-correlating with IR-dust emission, high angular resolution is also of fundamental importance in order to obtain unbiased results. The choice of the observational frequency is also of key importance in continuum observation. We calculate a merit function that accounts for the signal-to-noise ratio (SNR) in AME observation given the current state-of-the-art knowledge and technology. We also include in our merit functions the frequency dependence in the case of multifrequency observations. We briefly mention and compare the performance of four of the largest radiotelescopes in the world and hope the observational programs in each of them will be as intense as possible.
description: Review accepted for publication in Advances in Astronomy
Coronal Magnetic Field Evolution from 1996 to 2012: Continuous Non-Potential Simulations
Creators: name: Yeates, A. R.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Coupled flux transport and magneto-frictional simulations are extended to simulate the continuous magnetic field evolution in the global solar corona for over 15 years, from the start of Solar Cycle 23 in 1996. By simplifying the dynamics, our model follows the build-up and transport of electric currents and free magnetic energy in the corona, offering an insight into the magnetic structure and topology that extrapolation-based models can not. To enable these extended simulations, we have implemented a more efficient numerical grid, and have carefully calibrated the surface flux transport model to reproduce the observed large-scale photospheric radial magnetic field, using emerging active regions determined from observed line-of-sight magnetograms. This calibration is described in some detail. In agreement with previous authors, we find that the standard flux transport model is insufficient to simultaneously reproduce the observed polar fields and butterfly diagram during Cycle 23, and that additional effects must be added. For the best-fit model, we use automated techniques to detect the latitude-time profile of flux ropes and their ejections over the full solar cycle. Overall, flux ropes are more prevalent outside of active latitudes but those at active latitudes are more frequently ejected. Future possibilities for space-weather prediction with this approach are briefly assessed.
description: 21 pages, 8 figures, accepted for Solar Physics topical issue on "Solar Origins of Space Weather and Space Climate"
title: Student Solutions of Non-traditional Geometry Tasks
Creators: name: Ďuriš, Viliam
name: Šumný, Timotej
name: Pavlovičová, Gabriela
Publisher: name: TEM Journal
Year: 2019

description: The article deals with student solutions of non-traditional geometry tasks focused on triangle constructions. The research conducted concerns the solutions proposed by the students of Mathematics Teaching in combination with another subject at the University of Tirana in Tirana, Albania, and Constantine the Philosopher University in Nitra, Slovakia. The second group consisted of technical education students in the field of Software Engineering at the Canadian Institute of Technology in Tirana, Albania. In this comparison, we focused on the success of the solution method used as well as comparison of the solution methods of the individual groups of students in terms of their success.
Semiclassical quantization and spectral limits of h-pseudodifferential and Berezin-Toeplitz operators
Creators: name: Pelayo, Álvaro
name: Polterovich, Leonid
name: Ngoc, San Vũ
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: Symplectic Geometry (math.SG)
subject: Spectral Theory (math.SP)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We introduce a minimalistic notion of semiclassical quantization and use it to prove that the convex hull of the semiclassical spectrum of a quantum system given by a collection of commuting operators converges to the convex hull of the spectrum of the associated classical system. This gives a quick alternative solution to the isospectrality problem for quantum toric systems. If the operators are uniformly bounded, the convergence is uniform. Analogous results hold for non-commuting operators.
description: 27 pages, 3 figures
Invisible defects in complex crystals
Creators: name: Longhi, S.
name: Della Valle, G.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We show that invisible localized defects, i.e. defects that can not be detected by an outside observer, can be realized in a crystal with an engineered imaginary potential at the defect site. The invisible defects are synthesized by means of supersymmetric (Darboux) transformations of an ordinary crystal using band-edge wave functions to construct the superpotential. The complex crystal has an entire real-valued energy spectrum and Bragg scattering is not influenced by the defects. An example of complex crystal synthesis is presented for the Mathieu potential.
The interplay between the electromagnetic and the muonic longitudinal profile at production
Creators: name: Conceição, Ruben
name: Andringa, Sofia
name: Cazon, Lorenzo
name: Pimenta, Mário
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The electromagnetic and the muonic longitudinal profile at production enclosure important information about the primary particle and the hadronic interactions that rule the shower development. In fact, these two profiles provide two different insights of the shower: the electromagnetic component gives a measurement of the energy and the strength of the neutral pion channel; while the muonic profile, being intimately related with the charged mesons decays, can be used as a direct probe for the high energy hadronic interactions. In this work we explore the interplay between the electromagnetic and muonic profiles, by analysing their phenomenologic behaviour for different primary masses and energies, zenith angles, and also different high energy hadronic interaction models. We have found that the muonic longitudinal profile at production displays universal features similar to what is known for the electromagnetic one. Moreover, we show that both profiles have new primary mass composition variables which are fairly independent of the high energy hadronic interaction model. Finally we discuss how the information in the electromagnetic and the muonic longitudinal profile can be combined to break the degeneracy between the primary mass composition and the high energy hadronic physics.
description: 5 pages, to appear in conference proceedings of International Symposium on Very High Energy Cosmic Ray Interactions (ISVHECRI 2012), Berlin, Germany
title: Conceptual Metaphors in the Chinese Housing Discourse (2010-2014): A corpus-based study of government rhetoric and its reception
Creators: name: Wang, Dan
Publisher: name: University of Kent
Year: 2022

description: The aim of this thesis is to examine metaphors used by the state and the public in the discussion of the Chinese housing discourse (CHD) between 2010 and 2014. In particular, the focal point of the study concerns the diverging views held towards housing by the state and the public. The study considers how these views are manifested through metaphors in particular, conducting a corpus-based analysis of a series of articles published by the state's official newspaper, People's Daily, as well as their corresponding reader comments. The thesis primarily draws upon Critical Discourse Analysis (CDA). This thesis also incorporates Lakoff and Johnson's (1980) Conceptual Metaphor Theory (CMT), Charteris-Black's (2004a) Critical Metaphor Theory, and Shi Xu's (2005) Cultural approach to Critical Discourse Analysis (CCDA) and, more specifically, what he labels as "Chinese Discourse Studies" (CNDS). Six major categories of metaphor are found to be prevalent among the state-controlled discourse and the public discourse: DISEASE, JOURNEY, WAR, FOOD, FAMILY, and NATURE. The analysis of these metaphors shows that the state favors metaphors with latent power (i.e.: knowledge) and this is represented in their preference of metaphors with strong connotations of professional power (e.g.: "doctor", "driver", "general"), whereas the public prefer representations of power that come from Chinese culture, e.g.: the hierarchy in Confucianism in FAMILY metaphors. Furthermore, it is shown that the state-controlled discourse changes its metaphor use strategy depending on the state of the market (always orienting towards a positive self-portrayal and legitimization of power), while the public tends to adopt similar metaphor categories, albeit with the intention to subvert some of them for the purposes of counter-discourse. Finally, the culture-specificity of metaphor use is also highlighted in the findings, with emphasis on the impact of Confucianism, Traditional Chinese Medicine, and Yin-Yang philosophy in the construction and manipulation of metaphorical language.
Link-disorder fluctuation effects on synchronization in random networks
Creators: name: Hong, Hyunsuk
name: Um, Jaegon
name: Park, Hyunggyu
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We consider one typical system of oscillators coupled through disordered link configurations in networks, i.e., a finite population of coupled phase oscillators with distributed intrinsic frequencies on a random network. We investigate collective synchronization behavior, paying particular attention to link-disorder fluctuation effects on the synchronization transition and its finite-size scaling (FSS). Extensive numerical simulations as well as the mean-field analysis have been performed. We find that link-disorder fluctuations effectively induce {\em uncorrelated random} fluctuations in frequency, resulting in the FSS exponent $\barν=5/2$, which is identical to that in the globally coupled case (no link disorder) with frequency-disorder fluctuations.
description: 5 pages, 5 figures
Perfect Echo HMQC: Sensitivity and Resolution Enhancement by Broadband Homonuclear Decoupling
Creators: name: Baishya, Bikash
name: Khetrapala, C. L
name: Dey, Krishna Kishor
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Homonuclear 1H-1H J-modulation leads to J-multiplets in F1 dimension of 2D 1H-13C HMQC spectra. This hampers unambiguous signal assignment for overcrowded 13C spectra. Broadband homonuclear decoupling has been achieved in the indirect t1 evolution period by incorporating blocks of perfect echo. This method enhances resolution and sensitivity of 2D 1H-13C HMQC spectra. The results on Cyclosporine demonstrate that the method is very efficient for -13CH2 groups, though partial sensitivity and resolution enhancements have also been observed for -13CH and -13CH3 groups. Interpretation of the result based on product operator formalism is also given.
The formation of IRIS diagnostics I. A quintessential model atom of Mg II and general formation properties of the Mg II h&k lines
Creators: name: Leenaarts, J.
name: Pereira, T. M. D.
name: Carlsson, M.
name: Uitenbroek, H.
name: de Pontieu, B.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: NASA's Interface Region Imaging Spectrograph (IRIS) space mission will study how the solar atmosphere is energized. IRIS contains an imaging spectrograph that covers the Mg II h&k lines as well as a slit-jaw imager centered at Mg II k. Understanding the observations will require forward modeling of Mg II h&k line formation from 3D radiation-MHD models. This paper is the first in a series where we undertake this forward modeling. We discuss the atomic physics pertinent to h&k line formation, present a quintessential model atom that can be used in radiative transfer computations and discuss the effect of partial redistribution (PRD) and 3D radiative transfer on the emergent line profiles. We conclude that Mg II h&k can be modeled accurately with a 4-level plus continuum Mg II model atom. Ideally radiative transfer computations should be done in 3D including PRD effects. In practice this is currently not possible. A reasonable compromise is to use 1D PRD computations to model the line profile up to and including the central emission peaks, and use 3D transfer assuming complete redistribution to model the central depression.
description: 13 pages, 13 figures, accepted for ApJ
Crystal Structure of BaFe2Se3 as a Function of Temperature and Pressure: Phase Transition Phenomena and High-Order Expansion of Landau Potential
Creators: name: Svitlyk, V.
name: Chernyshov, D.
name: Pomjakushina, E.
name: Krzton-Maziopa, A.
name: Conder, K.
name: Pomjakushin, V.
name: Pottgen, R.
name: Dmitriev, V.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: BaFe2Se3 (Pnma, CsAg2I3-type structure), recently assumed to show superconductivity at ~ 11 K, exhibits a pressure-dependent structural transition to the CsCu2Cl3-type structure (Cmcm space group) around 60 kbar, as evidenced from pressure-dependent synchrotron powder diffraction data. Temperature-dependent synchrotron powder diffraction data indicate an evolution of the room-temperature BaFe2Se3 structure towards a high symmetry CsCu2Cl3 form upon heating. Around 425 K BaFe2Se3 undergoes a reversible, first order isostructural transition, that is supported by the differential scanning calorimetry data. The temperature-dependent structural changes occur in two stages, as determined by the alignment of the FeSe4 tetrahedra and corresponding adjustments of the positions of Ba atoms. On further heating, a second order phase transformation into the Cmcm structure is observed at 660 K. A rather unusual combination of isostructural and second-order phase transformations is parameterized within phenomenological theory assuming high-order expansion of Landau potential. A generic phase diagram mapping observed structures is proposed on the basis of the parameterization.
description: 22 pages, 15 figures
title: A Novel Strategy for the Synthetic Selection of Enhanced Therapeutic Aptamers
Creators: name: Paul, Alexandra Rosie
Publisher: name: University of Kent
Year: 2022

description: The epidermal growth factor receptor protein (EGFR) promotes tumorigenesis in many cancers, including breast, lung, colon and glioblastoma. Deregulation of EGFR activity in cancer is mainly due to point mutation, kinase domain deletion or gene amplification. It is essential to have EGFR-targeted therapies because it is among the most commonly altered genes in cancer. Aptamers are single-stranded oligonucleotide sequences that bind with high affinity and specificity to diverse targets. The recognition capacity of aptamers can be harnessed for therapeutic agents. The chemistry of aptamers is largely limited to that of nucleic acids, and although non-natural modifications of nucleic acids are known to enhance aptamer affinity, there is not yet a technology for selecting the right modifications amongst billions of possibilities. This project aims to develop the first general method for the discovery of nucleoside modifications that increase aptamer binding efficacy. A library will be created of over 65,000 different chemical modifications on a known aptamer sequence (MinE07), which binds to EGFR protein. The modifications will use different types of chemistry to see how they will affect the binding and folding of the aptamer MinE07, aiming to improve the binding between MinE07 and EGFR. These will be attached on beads such that each bead displays millions of copies of a single aptamer sequence. The selection will then be carried out using a flow cytometer (FACS) to separate out the aptamer sequences with the highest affinity for EGFR from the one-bead-one-sequence aptamer library. These will then be identified using mass spectrometry. These top selected aptamer sequences will be subjected to biophysical and biological testing. This research provides a new method for synthesising and screening in a short space of time large drug candidate libraries producing new drug candidates and impacting drug discovery processes.
SiO collimated outflows driven by high-mass YSOs in G24.78+0.08
Creators: name: Codella, C.
name: Beltran, M. T.
name: Cesaroni, R.
name: Moscadelli, L.
name: Neri, R.
name: Vasta, M.
name: Zhang, Q.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We imaged the molecular outflows towards the cluster of high-mass young stellar objects G24.78+0.08 at high-angular resolution using SiO emission, which is considered the classical tracer of protostellar jets. We performed SiO observations with the VLA interferometer in the J = 1-0 v=0 transition and with the SMA array in the 5-4 transition. A complementary IRAM 30-m single-dish survey in the (2-1), (3-2), (5-4), and (6-5) SiO lines was also carried out. Two collimated SiO high-velocity outflows driven by the A2 and C millimeter continuum massive cores have been imaged. On the other hand, we detected no SiO outflow driven by the young stellar objects in more evolved evolutionary phases that are associated with ultracompact (B) or hypercompact (A1) HII regions. The LVG analysis reveals high-density gas (10^3-10^4 cm-3), with well constrained SiO column densities (0.5-1 10^15 cm-2). The driving source of the A2 outflow is associated with typical hot core tracers such as methyl formate, vinyl cyanide, cyanoacetilene, and acetone. The driving source of the main SiO outflow in G24 has an estimated luminosity of a few 10^4 Lsun (typical of a late O-type star) and is embedded in the 1.3 mm continuum core A2, which in turn is located at the centre of a hot core that rotates on a plane perpendicular to the outflow main axis. The present SiO images support a scenario similar to the low-mass case for massive star formation, where jets that are clearly traced by SiO emission, create outflows of swept-up ambient gas usually traced by CO.
description: Astronomy & Astrophysics, in press
Barrier properties of k-mer packings
Creators: name: Lebovka, N.
name: Khrapatiy, S.
name: Vygornitskyi
name: Pivovarova, N.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: This work discusses numerical studies of the barrier properties of k-mer packings by Monte Carlo method. The studied variants of regular and non-regular arrangements on a square lattice included models of random sequential adsorption (RSA) and random deposition (RD). The discrete problem of diffusion through the bonds of a square lattice was considered. The k-mers were perfectly oriented perpendicular to the diffusion direction and blocked certain fraction of bonds $f_b$ against diffusion. For loose RSA and RD packings, the percolation like-behavior of diffusion coefficient was observed and the data evidenced that their barrier properties at large values of k may be more effective than those of some dense packings. Such anomalous behavior can reflect the details of k-mer spatial organization (aggregation) and structure of pores in RD and RSA packings. The contradictions between simulation data and predictions of EM theory were also discussed.
description: 10 pages, 7 figures
Shared Purity of Multipartite Quantum States
Creators: name: Biswas, Anindya
name: De, Aditi Sen
name: Sen, Ujjwal
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Fidelity plays an important role in measuring distances between pairs of quantum states, of single as well as multiparty systems. Based on the concept of fidelity, we introduce a physical quantity, shared purity, for arbitrary pure or mixed quantum states of shared systems of an arbitrary number of parties in arbitrary dimensions. We find that it is different from quantum correlations. However, we prove that a maximal shared purity between two parties excludes any shared purity of these parties with a third party, thus ensuring its quantum nature. Moreover, we show that all generalized GHZ states are monogamous, while all generalized W states are non-monogamous with respect to this measure. We apply the quantity to investigate the quantum XY spin models, and observe that it can faithfully detect the quantum phase transition present in these models. We perform a finite-size scaling analysis and find the scaling exponent for this quantity.
description: 10 pages, 6 figures, REVTeX 4.1
Plancherel representations of $U(\infty)$ and correlated Gaussian Free Fields
Creators: name: Borodin, Alexei
name: Bufetov, Alexey
Publisher: name: arXiv
Year: 2013
Subjects: subject: Representation Theory (math.RT)
subject: Mathematical Physics (math-ph)
subject: Probability (math.PR)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We study asymptotics of traces of (noncommutative) monomials formed by images of certain elements of the universal enveloping algebra of the infinite-dimensional unitary group in its Plancherel representations. We prove that they converge to (commutative) moments of a Gaussian process that can be viewed as a collection of simply yet nontrivially correlated two-dimensional Gaussian Free Fields. The limiting process has previously arisen via the global scaling limit of spectra for submatrices of Wigner Hermitian random matrices. The results of the present work were announced in arXiv:1203.3010.
description: 43 pages
On the Remote Detection of Suprathermal Ions in the Solar Corona and their Role as Seeds for Solar Energetic Particle Production
Creators: name: Laming, J. Martin
name: Moses, J. Dan
name: Ko, Yuan-Kuen
name: Ng, Chee K.
name: Rakowski, Cara E.
name: Tylka, Allan J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Forecasting large Solar Energetic Particle (SEP) events associated with shocks driven by fast coronal mass ejections (CME) pose a major difficulty in the field of Space Weather. Besides issues associated with CME initiation, the SEP intensities are difficult to predict, spanning 3 orders of magnitude at any given CME speed. Many lines of indirect evidence point to the pre-existence of suprathermal seed particles for injection into the acceleration process as a key ingredient limiting the SEP intensity of a given event. This paper outlines the observational and theoretical basis for the inference that a suprathermal particle population is present prior to large SEP events, explores various scenarios for generating seed particles and their observational signatures, and explains how such suprathermals could be detected through measuring the wings of the H I Ly-alpha line.
description: 15 pages, emulateapj, 6 figures, accepted by ApJ
Klein tunneling of two correlated bosons
Creators: name: Longhi, S.
name: Della Valle, G.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Reflection of two strongly interacting bosons with long-rage interaction hopping on a one-dimensional lattice scattered off by a potential step is theoretically investigated in the framework of the extended Hubbard model. The analysis shows that, in the presence of unbalanced on-site and nearest-neighbor site interaction, two strongly correlated bosons forming a bound particle state can penetrate a high barrier, despite the single particle can not. Such a phenomenon is analogous to one-dimensional Klein tunneling of a relativistic massive Dirac particle across a potential step.
description: 10 pages; Spring select paper; highlighted in: Science Daily, 29 May 2013 and in phys.org May 29, 2013
Giant Magnetized Outflows from the Centre of the Milky Way
Creators: name: Carretti, E.
name: Crocker, R. M.
name: Staveley-Smith, L.
name: Haverkorn, M.
name: Purcell, C.
name: Gaensler, B. M.
name: Bernardi, G.
name: Kesteven, M. J.
name: Poppi, S.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The nucleus of the Milky Way is known to harbour regions of intense star formation activity as well as a super-massive black hole. Recent Fermi space telescope observations have revealed regions of γ-ray emission reaching far above and below the Galactic Centre, the so-called Fermi bubbles. It is uncertain whether these were generated by nuclear star formation or by quasar-like outbursts of the central black hole and no information on the structures' magnetic field has been reported. Here we report on the detection of two giant, linearly-polarized radio Lobes, containing three ridge-like sub-structures, emanating from the Galactic Centre. The Lobes each extend ~60 deg, bear a close correspondence to the Fermi bubbles, are located in the Galactic bulge, and are permeated by strong magnetic fields of up to 15 μG. Our data signal that the radio Lobes originate in a bi-conical, star-formation (rather than black hole) driven outflow from the Galaxy's central 200 pc that transports a massive magnetic energy of ~10^55 erg into the Galactic halo. The ridges wind around this outflow and, we suggest, constitute a `phonographic' record of nuclear star formation activity over at least 10 Myr.
description: Published in Nature, main article. 20 pages, 4 figures
title: Working Papers Contested Order, Vol 5 (2012)
Creators: name: Working Papers Contested Order
Publisher: name: University Library Heidelberg
Year: 2014

description: Human Rights Language as an Instrument. An Analysis of the Sex Work Discourse in South Africa with a Focus on Human Rights
description: Impressum
 Content
 Human Rights Language as an Instrument. An Analysis of the Sex Work Discourse in South Africa with a Focus on Human Rights...2-21
 Overview of the Working Papers published in the Working Paper Series of the Research Area CONTESTED ORDER
description: Titel
Spectroscopic evidence for polaronic behaviour of the strong spin-orbit insulator Sr$_3$Ir$_2$O$_7$
Creators: name: King, P. D. C.
name: Takayama, T.
name: Tamai, A.
name: Rozbicki, E.
name: Walker, S. McKeown
name: Shi, M.
name: Patthey, L.
name: Moore, R. G.
name: Lu, D.
name: Shen, K. M.
name: Takagi, H.
name: Baumberger, F.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We investigate the bilayer Ruddlesden-Popper iridate Sr$_3$Ir$_2$O$_7$ by temperature-dependent angle-resolved photoemission. We find a narrow-gap correlated insulator, with spectral features indicative of a polaronic ground state, strikingly similar to that observed previously for the parent compounds of the cuprate superconductors. We additionally observe similar behaviour for the single-layer cousin Sr$_2$IrO$_4$, indicating that strong electron-boson coupling dominates the low-energy excitations of this exotic family of materials, and providing a microscopic link between the insulating ground states of the seemingly-disparate 3d cuprates and 5d iridates.
description: 6 pages, 4 figures. A high resolution version is available at http://www.st-andrews.ac.uk/~pdk6/pub_files/Ir327_cond_mat_HiRes.pdf
Self-organization of progress across the century of physics
Creators: name: Perc, Matjaz
Publisher: name: arXiv
Year: 2013
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Digital Libraries (cs.DL)
subject: Social and Information Networks (cs.SI)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We make use of information provided in the titles and abstracts of over half a million publications that were published by the American Physical Society during the past 119 years. By identifying all unique words and phrases and determining their monthly usage patterns, we obtain quantifiable insights into the trends of physics discovery from the end of the 19th century to today. We show that the magnitudes of upward and downward trends yield heavy-tailed distributions, and that their emergence is due to the Matthew effect. This indicates that both the rise and fall of scientific paradigms is driven by robust principles of self-organization. Data also confirm that periods of war decelerate scientific progress, and that the later is very much subject to globalization.
description: 5 two-column pages, 5 figures; accepted for publication in Scientific Reports [the n-gram viewer for publications of the American Physical Society is available at http://www.matjazperc.com/aps]
The formation of IRIS diagnostics II. The formation of the Mg II h&k lines in the solar atmosphere
Creators: name: Leenaarts, J.
name: Pereira, T. M. D.
name: Carlsson, M.
name: Uitenbroek, H.
name: de Pontieu, B.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: NASA's Interface Region Imaging Spectrograph (IRIS) small explorer mission will study how the solar atmosphere is energized. IRIS contains an imaging spectrograph that covers the Mg II h&k lines as well as a slit-jaw imager centered at Mg II k. Understanding the observations requires forward modeling of Mg II h&k line formation from 3D radiation-MHD models. We compute the vertically emergent h&k intensity from a snapshot of a dynamic 3D radiation-MHD model of the solar atmosphere, and investigate which diagnostic information about the atmosphere is contained in the synthetic line profiles. We find that the Doppler shift of the central line depression correlates strongly with the vertical velocity at optical depth unity, which is typically located less than 200 km below the transition region (TR). By combining the Doppler shifts of the h and the k line we can retrieve the sign of the velocity gradient just below the TR. The intensity in the central line depression is anticorrelated with the formation height, especially in subfields of a few square Mm. This intensity could thus be used to measure the spatial variation of the height of the transition region. The intensity in the line-core emission peaks correlates with the temperature at its formation height, especially for strong emission peaks. The peaks can thus be exploited as a temperature diagnostic. The wavelength difference between the blue and red peaks provides a diagnostic of the velocity gradients in the upper chromosphere. The intensity ratio of the blue and red peaks correlates strongly with the average velocity in the upper chromosphere. We conclude that the Mg II h&k lines are excellent probes of the very upper chromosphere just below the transition region, a height regime that is impossible to probe with other spectral lines.
description: 15 pages, 12 figures, accepted for ApJ, astro-ph abstract shortened to confirm to submission requirements
Double loop quantum enveloping algebras
Creators: name: Wu, Zhixiang
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Algebra (math.QA)
subject: Rings and Algebras (math.RA)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: Primary 17B10, 17B37, Secondary 16T20, 81R50

description: In this paper we describe certain homological properties and representations of a two-parameter quantum enveloping algebra $U_{g,h}$ of ${\frak {sl}}(2)$, where $g,h$ are group-like elements.
description: 24 pages,will appear on Journal of Algebra and its Applications
The BPS spectrum of the 4d N=2 SCFT's H_1, H_2, D_4, E_6, E_7, E_8
Creators: name: Cecotti, Sergio
name: Del Zotto, Michele
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Extending results of arXiv:1112.3984, we show that all rank 1 N=2 SCFT's in the sequence H_1, H_2, D_4 E_6, E_7, E_8 have canonical finite BPS chambers containing precisely 2 h(F)=12(Delta-1) hypermultiplets. The BPS spectrum of the canonical BPS chambers saturates the conformal central charge c, and satisfies some intriguing numerology.
description: 14 pages
Preperint material on Macao
Creators: name: (:Unav)
Publisher: name: Columbia University
Year: 2021
Subjects: Travel

description: Note reads: Work done at townsend post-production co./macao-u.p.t wild track 16mm-w.p +16mm optical track; Ted Conant-1957/inside of the tin box cover there is another reel (18x18) labeled "macao track"
title: Inhalt / Aktuelle Ausstellungen / Impressum
Creators: name: Redaktion, Die
Publisher: name: University Library Heidelberg
Year: 2015

description: KulturGut : aus der Forschung des Germanischen Nationalmuseums, Nr. 4 (2005): KulturGut : aus der Forschung des Germanischen Nationalmuseums, Beginn und Erscheinungsfrequenz: Jahr: 2004
PBS - P.O.V. - "HOMES APART" - Film on two Koreas
Creators: name: (:Unav)
Publisher: name: Columbia University
Year: 2021
Subjects: Families

description: Dub from 1/2 VHS; Year: 1991; Length: 58' 23''; Distribution: Amer. Documentary 350 West 58th St. NYC 10019
title: Romanische Säulen aus Worms. Unbekannte Bauteile der St. Johanneskirche
Creators: name: Kammel, Frank Matthias
Publisher: name: University Library Heidelberg
Year: 2015

description: KulturGut : aus der Forschung des Germanischen Nationalmuseums, Nr. 11 (2006): KulturGut : aus der Forschung des Germanischen Nationalmuseums, Beginn und Erscheinungsfrequenz: Jahr: 2004
Phase Resolved Observations of Temporal Soliton Pulse Propagation in Silicon Nanowires
Creators: name: Marko, Matthew
name: Li, Xiujian
name: Zheng, Jiangjun
name: Liao, Jiali
name: Husko, Chad
Publisher: name: arXiv
Year: 2013
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: An effort was conducted to study temporal soliton pulse propagation in silicon nano-waveguides. These nonlinear phenomenas were studied both numerically and experimentally with phase-resolved Frequency Resolved Optical Gating. Soliton pulse broadening, as well as pulse splitting from two-photon absorption, was observed experimentally, and the simulations matched all of the experimental results. Further simulations with the validated model have demonstrated that compression can be observed in centimeter-length waveguides. This study has demonstrated the feasibility of self-sustaining soliton pulse propagation at substantially shorter length scales than optical fibers, which offers much potential applications with regards to all-optical data transfer and computing.
title: Deutsche Gemütlichkeit als Exportartikel
Creators: name: Peters, Ursula
Publisher: name: University Library Heidelberg
Year: 2015

description: KulturGut : aus der Forschung des Germanischen Nationalmuseums, Nr. 8 (2006): KulturGut : aus der Forschung des Germanischen Nationalmuseums, Beginn und Erscheinungsfrequenz: Jahr: 2004
title: Der Teufel liegt im Detail. Neues zu Nürnberger Silbermarken
Creators: name: Tebbe, Karin
Publisher: name: University Library Heidelberg
Year: 2015

description: KulturGut : aus der Forschung des Germanischen Nationalmuseums, Nr. 8 (2006): KulturGut : aus der Forschung des Germanischen Nationalmuseums, Beginn und Erscheinungsfrequenz: Jahr: 2004
title: Inhalt / Aktuelle Ausstellungen / Impressum
Creators: name: Redaktion, Die
Publisher: name: University Library Heidelberg
Year: 2015

description: KulturGut : aus der Forschung des Germanischen Nationalmuseums, Nr. 18 (2008): KulturGut : aus der Forschung des Germanischen Nationalmuseums, Beginn und Erscheinungsfrequenz: Jahr: 2004
Civil Conflict and Firm Recovery: Evidence from Côte d’Ivoire
Creators: name: Léon, Florian
name: Dosso, Ibrahima
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biotechnology
subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: Sociology
subject: FOS: Sociology
subject: Science Policy

description: This paper examines how firms bounce back after a short, albeit severe, civil conflict. Thanks to a rich firm-level database, we follow surviving enterprises before, during and after the 2011 post-electoral crisis in Côte d'Ivoire. Main findings are summarized as follows. First, recovery was rapid in the first year but imperfect: 3 years after the shock, firms did not reach their pre-crisis level of productivity. Second, we show a wide heterogeneity in recovery across firms according to their initial characteristics (before the crisis). Young and local firms are more able to rebound after the crisis. In addition, credit-constrained firms are less resilient, highlighting the importance of access to credit in post-crisis periods. Finally, the recovery is quicker for labor-intensive firms; but firms relying more on skilled workers are less likely to rebound.
title: Inhalt / Aktuelle Ausstellungen / Impressum
Creators: name: Redaktion, Die
Publisher: name: University Library Heidelberg
Year: 2015

description: KulturGut : aus der Forschung des Germanischen Nationalmuseums, Nr. 23 (2009): KulturGut : aus der Forschung des Germanischen Nationalmuseums, Beginn und Erscheinungsfrequenz: Jahr: 2004
Macao-Portuguese life-Panoramic Views
Creators: name: (:Unav)
Publisher: name: Columbia University
Year: 2021
Subjects: Travel

description: Macao-Portuguese life-Panoramic Views; Chinese 1600 life, harbour series-malto etc, shot by TRC in China (Macao) 1955-1959. Theodore R. Conant : Macao Orig-color footage 1159; reel 2 of 3
Crystal structure and epitaxy of Bi2Te3 films grown on Si
Creators: name: Park, Jihwey
name: Soh, Yeong-Ah
name: Aeppli, G.
name: Bland, S. R.
name: Zhu, Xie-Gang
name: Chen, Xi
name: Xue, Qi-Kun
name: Grey, Francois
Publisher: name: arXiv
Year: 2012
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report comprehensive x-ray diffraction studies of the crystal structure and epitaxy of thin films of the topological insulator Bi2Te3 grown on Si (1 1 1). The films are single crystals of high crystalline quality, which strongly depends on that of their substrates, with in-plane epitaxial relationships of Bi2Te3 [2 1 -3 0] || Si [1 -1 0] and Bi2Te3 [0 1 -1 0] || Si [1 1 -2] along which the lattices of 1x3 Bi2Te3 and 2x2 Si supercells are well matched. As the samples age, we observe loss of crystalline Bi2Te3 film thickness accompanied with roughening of the crystalline interfaces, formation of new crystalline phases as well as compositional and structural modification of the Si substrate, consistent with the diffusion of Te into the Si substrate.
On the gauge symmetries of the spinning particle
Creators: name: Kiriushcheva, N.
name: Kuzmin, S. V.
name: McKeon, D. G. C.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We reconsider the gauge symmetries of the spinning particle by a direct examination of the Lagrangian using a systematic procedure based on the Noether identities. It proves possible to find a set of local Bosonic and Fermionic gauge transformations that have a simple gauge group structure, which is a true Lie algebra, both for the massless and massive case. This new Fermionic gauge transformation of the "position" and "spin" variables in the action decouples from that of the "einbein" and "gravitino". It is also possible to redefine the fields so that this simple algebra of commutators of the gauge transformations can be derived directly starting from the Lagrangian written in these new variables. We discuss a possible extension of our analysis of this simple model to more complicated cases.
description: 11 pages