cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Neural network-based on-chip spectroscopy using a scalable plasmonic encoder
Creators: name: Brown, Calvin
name: Goncharov, Artem
name: Ballard, Zachary
name: Fordham, Mason
name: Clemens, Ashley
name: Qiu, Yunzhe
name: Rivenson, Yair
name: Ozcan, Aydogan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: Machine Learning (cs.LG)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Conventional spectrometers are limited by trade-offs set by size, cost, signal-to-noise ratio (SNR), and spectral resolution. Here, we demonstrate a deep learning-based spectral reconstruction framework, using a compact and low-cost on-chip sensing scheme that is not constrained by the design trade-offs inherent to grating-based spectroscopy. The system employs a plasmonic spectral encoder chip containing 252 different tiles of nanohole arrays fabricated using a scalable and low-cost imprint lithography method, where each tile has a unique geometry and, thus, a unique optical transmission spectrum. The illumination spectrum of interest directly impinges upon the plasmonic encoder, and a CMOS image sensor captures the transmitted light, without any lenses, gratings, or other optical components in between, making the entire hardware highly compact, light-weight and field-portable. A trained neural network then reconstructs the unknown spectrum using the transmitted intensity information from the spectral encoder in a feed-forward and non-iterative manner. Benefiting from the parallelization of neural networks, the average inference time per spectrum is ~28 microseconds, which is orders of magnitude faster compared to other computational spectroscopy approaches. When blindly tested on unseen new spectra (N = 14,648) with varying complexity, our deep-learning based system identified 96.86% of the spectral peaks with an average peak localization error, bandwidth error, and height error of 0.19 nm, 0.18 nm, and 7.60%, respectively. This system is also highly tolerant to fabrication defects that may arise during the imprint lithography process, which further makes it ideal for applications that demand cost-effective, field-portable and sensitive high-resolution spectroscopy tools.
description: 18 pages, 6 figures
HL-Pow: A Learning-Based Power Modeling Framework for High-Level Synthesis
Creators: name: Lin, Zhe
name: Zhao, Jieru
name: Sinha, Sharad
name: Zhang, Wei
Publisher: name: arXiv
Year: 2020
Subjects: subject: Hardware Architecture (cs.AR)
subject: FOS: Computer and information sciences

description: High-level synthesis (HLS) enables designers to customize hardware designs efficiently. However, it is still challenging to foresee the correlation between power consumption and HLS-based applications at an early design stage. To overcome this problem, we introduce HL-Pow, a power modeling framework for FPGA HLS based on state-of-the-art machine learning techniques. HL-Pow incorporates an automated feature construction flow to efficiently identify and extract features that exert a major influence on power consumption, simply based upon HLS results, and a modeling flow that can build an accurate and generic power model applicable to a variety of designs with HLS. By using HL-Pow, the power evaluation process for FPGA designs can be significantly expedited because the power inference of HL-Pow is established on HLS instead of the time-consuming register-transfer level (RTL) implementation flow. Experimental results demonstrate that HL-Pow can achieve accurate power modeling that is only 4.67% (24.02 mW) away from onboard power measurement. To further facilitate power-oriented optimizations, we describe a novel design space exploration (DSE) algorithm built on top of HL-Pow to trade off between latency and power consumption. This algorithm can reach a close approximation of the real Pareto frontier while only requiring running HLS flow for 20% of design points in the entire design space.
description: published as a conference paper in ASP-DAC 2020
Superconductivity at 52 K in iron-based F-doped layered quaternary compound Pr[O1-xFx]FeAs
Creators: name: Ren, Zhi-An
name: Yang, Jie
name: Lu, Wei
name: Yi, Wei
name: Che, Guang-Can
name: Dong, Xiao-Li
name: Sun, Li-Ling
name: Zhao, Zhong-Xian
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Since the discovery of copper oxide superconductor in 1986 [1], extensive efforts have been devoted to the search of new high-Tc superconducting materials, especially high-Tc systems other than cuprates. The recently discovered quaternary superconductor La[O1-xFx]FeAs with the superconducting critical transition Tc of 26 K [2], which has a much simple layered structure compared with cuprates, has attracted quick enthusiasm and is going to become a new high-Tc system [3-6]. Here we report the discovery of bulk superconductivity in the praseodymium-arsenide oxides Pr[O1-xFx]FeAs with an onset drop of resistivity as high as 52 K, and the unambiguous zero-resistivity and Meissner transition at low temperature, which will place these quaternary compounds to another high-Tc superconducting system explicitly.
description: 4 pages
Hadron-Pair Photoproduction in Longitudinally Polarized Lepton-Nucleon Collisions
Creators: name: Hendlmeier, C.
name: Stratmann, M.
name: Schafer, A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present a detailed phenomenological study of photoproduction of two hadrons, both with high transverse momentum, in longitudinally polarized lepton-nucleon collisions. We consistently include ``direct'' and ``resolved'' photon contributions and examine the sensitivity of the relevant spin asymmetries to the gluon polarization in the nucleon and to the completely unknown parton content of circularly polarized photons. Our results are relevant for the COMPASS and HERMES fixed-target experiments as well as for a possible future polarized lepton-proton collider like eRHIC at BNL. So far, all studies are limited to the lowest order approximation of QCD.
description: 10 pages, 9 eps figures
Resolved Galaxies in the Hubble Ultra Deep Field: Star Formation in Disks at High Redshift
Creators: name: Elmegreen, Debra Meloy
name: Elmegreen, Bruce G.
name: Ravindranath, Swara
name: Coe, Daniel A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The photometric redshift distributions, spectral types, Sersic indices, and sizes of all resolved galaxies in the Hubble Space Telescope Ultra Deep Field (UDF) are studied in order to understand the environment and nature of star formation in the early Universe. Clumpy disk galaxies that are bright at short wavelengths (restframe <5000 Angstroms) dominate the UDF out to z~5.5. Their uniformity in V/V_max and co-moving volume density suggest they go even further, spanning a total time more than an order of magnitude larger than their instantaneous star formation times. They precede as well as accompany the formation epoch of distant red galaxies and extreme red objects. Those preceding could be the pre-merger objects that combined to make red spheroidal types at z~2 to 3. Clumpy disks that do not undergo mergers are likely to evolve into spirals. The morphology of clumpy disks, the size and separation of the clumps, and the prevalence of this type of structure in the early Universe suggests that most star formation occurs by self-gravitational collapse of disk gas.
description: 40 pages, 13 figures, scheduled for ApJ Vol 658, April 1, 2007
The weak absorbing outflow in AGN Mrk 279: evidence of super-solar metal abundances
Creators: name: Fields, Dale L.
name: Mathur, Smita
name: Krongold, Yair
name: Williams, Rik
name: Nicastro, Fabrizio
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present analysis and photoionization modeling of the Chandra high resolution spectrum of Mrk 279. There is clear evidence of an absorbing outflow which is best fit by a two component model, one with a low ionization parameter and one with a higher ionization parameter. The column density of the X-ray warm absorber, about log N_H=20, is the smallest known of all AGNs in which X-ray absorbing outflows are observed. We find that the X-ray and UV/FUV absorbers are part of the same overall outflow. There is some evidence of super-solar carbon, nitrogen, oxygen and iron in the Chandra spectrum of Mrk 279. While this is not a robust result in itself, Chandra data in combination with the UV data and the pressure equilibrium between two phases of the outflow, support the scenario of super-solar abundances. This the first case where super-solar abundances are reported in the nucleus of a normal Seyfert galaxy. The data suggest that the outflow originates from a compact region around the nuclear black hole and that it carries insignificant amount of mass and energy.
description: 19 pages, 5 figures. Replaced with the version accepted for publication in the ApJ
Spectral energy distributions of dust and PAHs based on the evolution of grain size distribution in galaxies
Creators: name: Hirashita, Hiroyuki
name: Deng, Weining
name: Murga, Maria S.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Based on a one-zone evolution model of grain size distribution in a galaxy, we calculate the evolution of infrared spectral energy distribution (SED), considering silicate, carbonaceous dust, and polycyclic aromatic hydrocarbons (PAHs). The dense gas fraction ($η_\mathrm{dense}$) of the interstellar medium (ISM), the star formation time-scale ($τ_\mathrm{SF}$), and the interstellar radiation field intensity normalized to the Milky Way value ($U$) are the main parameters. We find that the SED shape generally has weak mid-infrared (MIR) emission in the early phase of galaxy evolution because the dust abundance is dominated by large grains. At an intermediate stage ($t\sim 1$ Gyr for $τ_\mathrm{SF}=5$ Gyr), the MIR emission grows rapidly because the abundance of small grains increases drastically by the accretion of gas-phase metals. We also compare our results with observational data of nearby and high-redshift ($z\sim 2$) galaxies taken by \textit{Spitzer}. We broadly reproduce the flux ratios in various bands as a function of metallicity. We find that small $η_\mathrm{dense}$ (i.e.\ the ISM dominated by the diffuse phase) is favoured to reproduce the 8 $μ$m intensity dominated by PAHs both for the nearby and the $z\sim 2$ samples. A long $τ_\mathrm{SF}$ raises the 8 $μ$m emission to a level consistent with the nearby low-metallicity galaxies. The broad match between the theoretical calculations and the observations supports our understanding of the grain size distribution, but the importance of the diffuse ISM for the PAH emission implies the necessity of spatially resolved treatment for the ISM.
description: 15 pages, 10 figures, accepted for publication in MNRAS
Effective Theories of Dense and Very Dense Matter
Creators: name: Schaefer, Thomas
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: In these lectures we discuss the uses of effective field theory in studying dense hadronic matter. We focus on two regimes in the phase diagram. At low baryon density nucleons can be described as non-relativistic point particles interacting via short range forces. Interesting effects arise because of the large nucleon-nucleon scattering length. At very large density QCD matter can be described in terms of quarks and gluons. Unusual many body effects arise because of long range gluons fields, and because of the way color and flavor get entangled in the superconducting state.
description: 49 pages, to appear in the proceedings of the ECT* school on ``Renormalization Group and Effective Field Theory Approaches to Many-Body Systems'', Springer Lecture Notes in Physics
Magnetic Reconnection as a Mechanism for Energy Extraction from Rotating Black Holes
Creators: name: Comisso, Luca
name: Asenjo, Felipe A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Spinning black holes store rotational energy that can be extracted. When a black hole is immersed in an externally supplied magnetic field, reconnection of magnetic field lines within the ergosphere can generate negative energy (relative to infinity) particles that fall into the black hole event horizon while other particles escape stealing energy from the black hole. We show analytically that energy extraction via magnetic reconnection is possible when the black hole spin is high (dimensionless spin $a\sim1$) and the plasma is strongly magnetized (plasma magnetization $σ_0>1/3$). The parameter space region where energy extraction is allowed depends on the plasma magnetization and the orientation of the reconnecting magnetic field lines. For $σ_0 \gg 1$, the asymptotic negative energy at infinity per enthalpy of the decelerated plasma that is swallowed by a maximally rotating black hole is found to be $ε^\infty_- \simeq - \sqrt{σ_0/3}$. The accelerated plasma that escapes to infinity and takes away black hole energy asymptotes the energy at infinity per enthalpy $ε^\infty_+ \simeq \sqrt{3σ_0}$. We show that the maximum power extracted from the black hole by the escaping plasma is $P_{\rm extr}^{\rm max} \sim 0.1 M^2\sqrt{σ_0}\,w_0$ (here, $M$ is the black hole mass and $w_0$ is the plasma enthalpy density) for the collisionless plasma regime and one order of magnitude lower for the collisional regime. Energy extraction causes a significant spindown of the black hole when $a \sim 1$. The maximum efficiency of the plasma energization process via magnetic reconnection in the ergosphere is found to be $η_{\rm max} \simeq 3/2$. Since fast magnetic reconnection in the ergosphere should occur intermittently in the scenario proposed here, the associated emission within a few gravitational radii from the black hole is expected to display a bursty nature.
The impact of using alterative risk views when setting harvest levels on an uncertain harvestable land base in British Columbia
Creators: name: Bogle, Timothy Norman
Publisher: name: University of British Columbia
Year: 2009

description: In British Columbia, the chief forester is legally required to set harvest levels within a dynamic forest environment. One of the most contentious issues currently is the size of the productive forest that is harvestable. The Forest Service has chosen to portray timber supply over time with a risk neutral approach towards the size of the harvestable land base, while other interest groups would advocate either a risk taking view or risk averse view. This study provides insight into the tradeoffs which are made in setting harvest levels with the three different risk views and a harvestable land base of unknown size for both a coastal and interior example. Harvest levels are determined for decade 1 and 2, using assumed principles for each view, after which time it is assumed that perfect information is in place for the rest of a 100 year planning horizon. Flexibility in harvest level determination after decade 2 is dependent on the harvest level choices made for decade 1 and 2. The indicators used to examine the implications of the different risk outlooks can be categorized as economic, harvest flow stability and state of the system. The indicators were in turn weighted by using one of three probability distributions coinciding with the presuppositions of the three risk views. The numerical results indicate that while large short term economic and harvest flow advantages are achieved through using a risk taking approach, future flexibility and economic value may be foregone. Conversely, using a risk averse view results in highly stable harvest flows over time at the expense of short term economic gain and the possibility of unnecessarily large reductions in harvest level before perfect information is available. It is believed that the risk neutral view, while foregoing some harvest flow flexibility, will result in a more robust strategy in yielding economic values close to those obtained by risk taking while achieving harvest flow characteristics close to those of the risk averse view. Based on the results, modifications to harvest flow policy are suggested as a means of further improving the strategic objectives while maintaining harvest flow policy decline guidelines.
The Hubble flow around the CenA / M83 galaxy complex
Creators: name: Karachentsev, Igor D
name: Tully, R Brent
name: Dolphin, A
name: Sharina, M
name: Makarova, L
name: Makarov, D
name: Kashibadze, O G
name: Karachentseva, V
name: Sakai, S
name: Shaya, E J
name: Rizzi, L
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present HST/ACS images and color-magnitude diagrams for 24 nearby galaxies in and near the constellation of Centaurus with radial velocities V_LG < 550 km/s. Distances are determined based on the luminosities of stars at the tip of the red giant branch that range from 3.0 Mpc to 6.5 Mpc. The galaxies are concentrated in two spatially separated groups around Cen A (NGC 5128) and M 83 (NGC 5236). The Cen A group itself has a mean distance of 3.76 +/-0.05 Mpc, a velocity dispersion of 136 km/s, a mean harmonic radius of 192 kpc, and an estimated orbital/virial mass of (6.4 - 8.1) x 10^12 M_sun. This elliptical dominated group is found to have a relatively high mass-to-light ratio: M/L_B = 125 M_sun/L_sun. For the M 83 group we derived a mean distance of 4.79 +/-0.10 Mpc, a velocity dispersion of 61 km/s, a mean harmonic radius of 89 kpc, and estimated orbital/virial mass of (0.8 - 0.9) x 10^12 M_sun. This spiral dominated group is found to have a relatively low M/L_B = 34 M_sun/L_sun. The radius of the zero-velocity surface around Cen A lies at R_0 = 1.40 +/-0.11 Mpc, implying a total mass within R_0 of M_T = (6.0 +/-1.4) x 10^12 M_sun. This value is in good agreement with the Cen A virial/orbital mass estimates and provides confirmation of the relatively high M/L_B of this elliptical-dominated group. The centroids of both the groups, as well as surrounding field galaxies, have very small peculiar velocities, < 25 km/s, with respect to the local Hubble flow with H_0 = 68 km/s/Mpc.
description: 31 pages including 9 figures and 3 tables. Accepted for publication in Astronomical Journal, 133, N0. 2 (February), 2007
Finding roots of polynomials over finite fields
Creators: name: Fedorenko, Sergei V.
name: Trifonov, Piter V.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: We propose an improved algorithm for finding roots of polynomials over finite fields. This makes possible significant speedup of the decoding process of Bose-Chaudhuri-Hocquenghem, Reed-Solomon, and some other error-correcting codes.
description: 6 pages. IEEE Transactions on Communications
Signature of band inversion in the antiferromagnetic phase of axion insulator candidate EuIn2As2
Creators: name: Sato, Takafumi
name: Wang, Zhiwei
name: Takane, Daichi
name: Souma, Seigo
name: Cui, Chaoxi
name: Li, Yongkai
name: Nakayama, Kosuke
name: Kawakami, Tappei
name: Kubota, Yuya
name: Cacho, Cephise
name: Kim, Timur K.
name: Arab, Arian
name: Strocov, Vladimir N.
name: Yao, Yugui
name: Takahashi, Takashi
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We have performed angle-resolved photoemission spectroscopy on EuIn2As2 which is predicted to be an axion insulator in the antiferromagnetic state. By utilizing soft-x-ray and vacuum-ultraviolet photons, we revealed a three-dimensional hole pocket centered at the Gamma point of bulk Brillouin zone together with a heavily hole-doped surface state in the paramagnetic phase. Upon entering the antiferromagnetic phase, the band structure exhibits a marked reconstruction characterized by the emergence of a "M"-shaped bulk band near the Fermi level. The qualitative agreement with first-principles band-structure calculations suggests the occurrence of bulk-band inversion at the Gamma point in the antiferromagnetic phase. We suggest that EuIn2As2 provides a good opportunity to study the exotic quantum phases associated with possible axion-insulator phase.
description: 8 pages, 5 figures
Welsh Wreck Web Research Project (North Cardigan Bay). On-line research into the wreck of the: KragerÃ�
Creators: name: Braybrooke, Nigel
Publisher: name: Archaeology Data Service
Year: 2024

description: Welsh Wreck Web Research Project unpublished report series, 1
description: This report looks at the Norwegian Barque Kragero and covers the time of her construction in Kragero, Norway in 1872, until her eventual scrapping at Appledore, Devon, UK in 1921.
Automated Coronal Hole Detection using He I 1083 nm Spectroheliograms and Photospheric Magnetograms
Creators: name: Henney, C. J.
name: Harvey, J. W.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A method for automated coronal hole detection using He I 1083 nm spectroheliograms and photospheric magnetograms is presented here. The unique line formation of the helium line allows for the detection of regions associated with solar coronal holes with minimal line-of-sight obscuration across the observed solar disk. The automated detection algorithm utilizes morphological image analysis, thresholding and smoothing to estimate the location, boundaries, polarity and flux of candidate coronal hole regions. The algorithm utilizes thresholds based on mean values determined from over 10 years of the Kitt Peak Vacuum Telescope daily hand-drawn coronal hole images. A comparison between the automatically created and hand-drawn images for a 11-year period beginning in 1992 is outlined. In addition, the creation of synoptic maps using the daily automated coronal hole images is also discussed.
description: 8 pages, 5 figures, Large-scale structures and their role in solar activity
Robert de Billy: Ένας Γάλλος διπλωμάτης στην Αθήνα 1917-1921
Creators: name: Ανέστη, Ειρήνη Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Γαλλία
Α΄ Παγκόσμιος Πόλεμος
Διπλωματία
France
World War I
Diplomacy

description: Σκοπός της παρούσας διπλωματικής εργασίας είναι να εξετάσει θέματα της ελληνικής εσωτερικής και εξωτερικής πολιτικής και των ελληνογαλλικών διμερών σχέσεων μέσα από τα διπλωματικά τηλεγραφήματα που αποστέλλονταν από τη γαλλική πρεσβεία της Αθήνας στην Κεντρική Υπηρεσία του γαλλικού Υπουργείου Εξωτερικών στο Παρίσι, στο διάστημα της θητείας του Γάλλου πρεσβευτή Robert de Billy στην Αθήνα από το 1917 έως και το 1921. Τα τηλεγραφήματα και το επιπλέον υλικό μελέτης, όπως τμήμα του προσωπικού ημερολογίου του πρεσβευτή, αποτελούν σημαντική πηγή άντλησης πληροφοριών, με την οπτική του πρεσβευτή και της γαλλικής πολιτικής, για τα ιστορικού ενδιαφέροντος γεγονότα που εκτυλίχθηκαν στον ελληνικού ενδιαφέροντος χώρο. Εξάγονται σημαντικές πληροφορίες σε σχέση με σημαντικά πρόσωπα της εποχής, για τα οποία παραθέτονται ιδιαίτερες λεπτομέρειες από την προσωπική επαφή του πρεσβευτή μαζί τους. Επιπλέον περιέχονται στοιχεία του σχεδιασμού της γαλλικής εξωτερικής πολιτικής στην ευρύτερη περιοχή της Ανατολικής Μεσογείου. Τέλος προσφέρεται μία πλήρης και συμπαγής θεώρηση της εξέλιξης των καίριων θεμάτων της ελληνικής εσωτερικής και εξωτερικής πολιτικής που χαρακτήρισαν την ταραγμένη και τόσο ιδιαίτερης σημασίας περίοδο της ελληνικής ιστορίας από τις τελευταίες ημέρες του Α΄ Παγκοσμίου Πολέμου μέχρι τη στιγμή της εξέλιξης της τελευταίας επίθεσης του ελληνικού στρατού στη Μικρά Ασία.
description: The aim of the present thesis is to examine issues of Greek domestic and foreign policy and Greek-French bilateral relations through the diplomatic telegrams sent by the French embassy in Athens to the Central Service of the French Ministry of Foreign Affairs in Paris, during the term of office of the minister Robert de Billy in Athens, from 1917 until 1921. The telegraphs and the additional study material, such as a part of the minister’s personal diary, constitute a major source of information from the minister’s and the French policy’s point of view on historic events that unfolded in the area of Greek interest. Important information is also exported concerning key persons of the time, for which are listed specific details, derived from the minister’s personal contact with them. Moreover the material contains elements of the French foreign policy design in the wider region of Eastern Mediterranean. Finally, it offers a complete and compact overview of the evolution of Greek domestic and foreign policy key issues, which characterized the troubled and of particular importance period of Greek history from the last days of World War I until the time of progression of the last attack of the Greek army in Asia Minor.
Effect of retardation on the frequency and linewidth of plasma resonances in a two-dimensional disk of electron gas
Creators: name: Zagorodnev, I. V.
name: Rodionov, D. A.
name: Zabolotnykh, A. A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We theoretically analyze dominant plasma modes in a two-dimensional disk of electron gas by calculating the absorption of an incident electromagnetic wave. The problem is solved in a self-consistent approximation, taking into account electromagnetic retardation effects. We use the Drude model to describe the conductivity of the system. The absorption spectrum exhibits a series of peaks corresponding to the excitation of plasma waves. The position and linewidth of the peaks designating, respectively, the frequency and damping rate of the plasma modes. We estimate the influence of retardation effects on the frequency and linewidth of the fundamental (dipole) and axisymmetric (quadrupole) plasma modes both numerically and analytically. We find the net damping rate of the modes to be dependent on not only the sum of the radiative and collisional decays but also their intermixture, even for small retardation. We show that the net damping rate can be noticeably less than that determined by collisions alone.
description: 10 pages, 4 figures
Electronic structure and magnetism in doped semiconducting half-Heusler compounds
Creators: name: Nanda, B. R. K.
name: Dasgupta, I.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We have studied in details the electronic structure and magnetism in M (Mn and Cr) doped semiconducting half-Heusler compounds FeVSb, CoTiSb and NiTiSn (XM$_{x}$Y$_{1-x}$Z) in a wide concentration range using local-spin density functional method in the framework of tight-binding linearized muffin tin orbital method(TB-LMTO) and supercell approach. Our calculations indicate that some of these compounds are not only ferromagnetic but also half-metallic and may be useful for spintronics applications. The electronic structure of the doped systems is analyzed with the aid of a simple model where we have considered the interaction between the dopant transition metal (M) and the valence band X-Z hybrid. We have shown that the strong X-d - M-d interaction places the M-d states close to the Fermi level with the M-t$_{2g}$ states lying higher in energy in comparison to the M-e$_{g}$ states. Depending on the number of available d-electrons, ferromagnetism is realized provided the d-manifold is partially occupied. The tendencies toward ferromagnetic(FM) or antiferromagnetic(AFM) behavior are discussed within Anderson-Hasegawa models of super-exchange and double-exchange. In our calculations for Mn doped NiTiSn, the strong preference for FM over AFM ordering suggests a possible high Curie temperature for these systems.
description: 14 pages, 6 figures
Axion results: what is new?
Creators: name: Masso, Eduard
name: Redondo, Javier
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The PVLAS collaboration has obtained results that may be interpreted in terms of a light axion-like particle, while the CAST collaboration has not found any signal of such particles. Moreover, the PVLAS results are in gross contradiction with astrophysical bounds. We develop a particle physics model with two paraphotons and with a low energy scale in which these apparent inconsistencies are circumvented.
description: 10 pages, 4 figures. Based on two talks given at the International Workshop "The dark side of the Universe", Madrid, June 2006: "Evading astrophysical bounds on axion-like particles in paraphoton models" by J. Redondo and "Axion results: what is new?" by E. Masso. To be published in the Proceedings
A variational principle for weighted Delaunay triangulations and hyperideal polyhedra
Creators: name: Springborn, Boris A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 51M20, 52C26

description: We use a variational principle to prove an existence and uniqueness theorem for planar weighted Delaunay triangulations (with non-intersecting site-circles) with prescribed combinatorial type and circle intersection angles. Such weighted Delaunay triangulations may be interpreted as images of hyperbolic polyhedra with one vertex on and the remaining vertices beyond the infinite boundary of hyperbolic space. Thus the main theorem states necessary and sufficient conditions for the existence and uniqueness of such polyhedra with prescribed combinatorial type and dihedral angles. More generally, we consider weighted Delaunay triangulations in piecewise flat surfaces, allowing cone singularities with prescribed cone angles in the vertices. The material presented here extends work by Rivin on Delaunay triangulations and ideal polyhedra.
description: 27 pages, many figures. v2: slightly restructured, typos corrected, references updated. Final version
Welsh Wreck Web Research Project (North Cardigan Bay). On-line research into the Sinking of: SS Kyanite (Steamship)
Creators: name: Davies, Gareth J.S.
Publisher: name: Archaeology Data Service
Year: 2024

description: Welsh Wreck Web Research Project unpublished report series, 1
description: On Feb 15 1917, the SS Kyanite was stopped by the German U-boat UC-65 approximately 28 miles SSW of Bardsey Island. The crew was offloaded and the SS Kyanite sunk.
Welsh Wreck Web Research Project (North Cardigan Bay). On-line research into the wreck of the: Chalonge / Lady Chandos
Creators: name: Perks, Graeme
Publisher: name: Archaeology Data Service
Year: 2023

description: Welsh Wreck Web Research Project unpublished report series, 1
description: The Chalonge was built at St Malo and on her maiden voyage to Newcastle was driven ashore in a severe gale near Hartlepool on her return with coals. The Chalonge was recovered but appears to have been sold, her name was changed to Lady Chandos and registered at Hartlepool. The Lady Chandos then sailed between the Northeast of England, the Baltic, Yarmouth and Southeast England carrying coal and returning with flour and other commodities. The registration of the Lady Chandos was transferred to Great Yarmouth by 1877 on her sale and she continued to sail between Yarmouth, Northeast England and Scotland. The cargo of lime being carried by the Lady Chandos caught fire in 1866 at Montrose and required the mast to be cut away. The Lady Chandos was involved in several collisions, was struck by lightning, damaged by the sea, lost anchors and caught fire on another occasion. The registration of the Lady Chandos remained at Yarmouth although the owners were based first in Cardiff then Milford Haven. The Lady Chandos then sailed between Wales, the south coast of England and Liverpool.
Homotopy type of the complement of an immersion and classification of embeddings of tori
Creators: name: Cencelj, M.
name: Repovš, D.
name: Skopenkov, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Geometric Topology (math.GT)
subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics
subject: 57R40; 57R42; 55Q52

description: This paper is devoted to the classification of embeddings of higher dimensional manifolds. We study the case of embeddings $S^p\times S^q\to S^m$, which we call knotted tori. The set of knotted tori in the the space of sufficiently high dimension, namely in the metastable range $m\ge p+3q/2+2$, $p\le q$, which is a natural limit for the classical methods of embedding theory, has been explicitely described earlier. The aim of this note is to present an approach which allows for results in lower dimension.
Σύνθεση και χαρακτηρισμός νανοσωματιδίων MnBi για εφαρμογές μονίμων μαγνητών
Creators: name: Κανάρη, Κωνσταντίνα Αλέξανδρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Νανοσωματίδια
Μηχανική άλεση με την προσθήκη επιφανειοδραστικού
Μόνιμοι μαγνήτες
Nanoparticles
Surfactant assisted ball milling
Permanent magnets

description: Σκοπός της διατριβής ήταν η παρασκευή σωματιδίων της διαμεταλλικής ένωσης MnBi με την τεχνική μηχανικής άλεσης με την προσθήκη επιφανειοδραστικών μορίων. Η μηχανική άλεση πραγματοποιήθηκε με δύο τεχνικές: αρχικά σε σφαιρόμυλο υψηλής ενέργειας, με παράλληλη προσθήκη ολεϊκού οξέος και ολεϋλαμίνης ως επιφανειοδραστικά μόρια και στη συνέχεια σε συμβατικό σφαιρόμυλο, με την προσθήκη μόνο ολεϊκού οξέος. Και στις δύο περιπτώσεις διερευνήθηκαν οι δομικές και μαγνητικές ιδιότητες των σωματιδίων, καθώς και ο ρόλος των επιφανειοδραστικών μορίων.
description: In this graduate thesis, intermetallic MnBi particles were synthesized, via the surfactant assisted ball milling method. The ball milling was conducted in two different ways: at first with a high energy mill and the addition of oleic acid and oleylamine as the surfactants and then with a conventional mill and the addition only of oleic acid. In both cases the structural and magnetic properties of the particles were studied, as well as the influence of the surfactants.
High Resolution Imaging of Warm and Dense Molecular Gas in the Nuclear Region of the Luminous Infrared Galaxy NGC6240
Creators: name: Iono, D.
name: Wilson, C.
name: Takakuwa, S.
name: Yun, M.
name: Petitpas, G.
name: Peck, A.
name: Ho, P.
name: Matsushita, S.
name: Pihlstrom, Y.
name: Wang, Z.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present ~2'' resolution CO(3-2), HCO+(4-3) and 880micron continuum images of the luminous infrared galaxy NGC6240 obtained at the Submillimeter Array. We find that the spatially resolved CO(3-2), HCO+(4-3) and the 880micron emission peaks between the two nuclear components that are both known to harbor AGNs. Our Large Velocity Gradient (LVG) analysis performed on each velocity channel suggests that the peak of the molecular gas emission traced in our observations is warm (T = 20 - 100K), dense (nH2 = 10^(5.0 - 5.4) cm^-3) and moderately optically thin (tau = 0.2 - 2) in the central 1 kpc. We also find large column densities of ~10^(23) cm^(-2). Such extreme conditions are observed over ~300 km s^(-1) centered around the CO derived systemic velocity. The derived molecular gas mass from the CO(3-2) emission and a CO-to-H2 conversion factor commonly used for ULIRGs is (6.9 +/- 1.7) x 10^9 Msun, and this is consistent with the mass derived from previous CO(2-1) observations. The gas is highly turbulent in the central kpc (Delta v_(FWZI) ~ 1175 km s^(-1)). Furthermore, possible inflow or outflow activity is suggested from the CO(3-2) velocity distribution. We tentatively state that 3.5 x 10^8 Msun of isolated CO(3-2) emission seen west of the northern disk may be associated with outflows from starburst superwinds, but the gas outflow scenario from one of the central AGN is not completely ruled out. Piecing all of the information together, the central region of NGC 6240 harbors 2 AGNs, ~10^(10) Msun of molecular gas mass, 5 x 10^7 Msun of dust mass, and has possible evidence of inflow and outflow activity.
description: ApJ accepted (19 pages in emulateapj)
Θεωρήσεις και προβληματισμοί για την έννοια της « σοφίας ». Η περίπτωση του Έτσι μίλησε ο Ζαρατούστρα του Φρίντριχ Νίτσε.
Creators: name: Νικολοπούλου, Παναγιώτα-Θεοφανώ Ηλία
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Σοφία
Άνθρωπος
Νίτσε
Wisdom
Human
Nietzsche

description: Στο πλαίσιο της παρούσας μελέτης ερευνώνται τα πολλαπλά νοήματα που επενδύουν τον όρο « σοφία », εννοουμένου ως ουσιαστικού κατηγορήματος της ανθρώπινης ύπαρξης. Για να επιτευχθεί αυτό, επιλέξαμε ως άξονες αναφοράς αφενός την Αριστοτέλεια σκέψη, η οποία θεωρείται από τον Μάρτιν Χάιντεγκερ ως το απόγειο της αρχαίας φιλοσοφίας, καθώς και την σκέψη του Φρίντριχ Νίτσε, όπως αυτή παρουσιάζεται ειδικότερα στο έργο του Έτσι μίλησε ο Ζαρατούστρα, τον οποίο ο Μάρτιν Χάιντεγκερ θεωρεί ως τον τελευταίο στοχαστή της μοντερνικότητας.
description: The following survey has examined the various meanings that are included in the word “wisdom”, “sophia” in greek, seen as the basic element of human existence. Our points of reference have been the Aristotelian thought, which is considered by Martin Heidegger the top of the ancient philosophy, and Friedrich Nietzsche’s view as it is presented in his book Thus spoke Zarathustra. Heidegger considers Nietzsche the last thinker of modernity.
Reachability Analysis of Nonlinear Discrete-Time Systems Using Polyhedral Relaxations and Constrained Zonotopes
Creators: name: Rego, Brenner S.
name: Raffo, Guilherme V.
name: Terra, Marco H.
name: Scott, Joseph K.
Publisher: name: arXiv
Year: 2025
Subjects: subject: Systems and Control (eess.SY)
subject: Optimization and Control (math.OC)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Mathematics

description: This paper presents a novel algorithm for reachability analysis of nonlinear discrete-time systems. The proposed method combines constrained zonotopes (CZs) with polyhedral relaxations of factorable representations of nonlinear functions to propagate CZs through nonlinear functions, which is normally done using conservative linearization techniques. The new propagation method provides better approximations than those resulting from linearization procedures, leading to significant improvements in the computation of reachable sets in comparison to other CZ methods from the literature. Numerical examples highlight the advantages of the proposed algorithm.
description: 6 pages, 2 figures. This is a preprint of the paper presented at the 63rd IEEE Conference on Decision and Control (CDC 2024). arXiv admin note: text overlap with arXiv:2504.00130
A vacuum problem for multidimensional compressible Navier-Stokes equations with degenerate viscosity coefficients
Creators: name: Chen, Ping
name: Zhang, Ting
Publisher: name: arXiv
Year: 2007
Subjects: subject: Analysis of PDEs (math.AP)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 35Q35 (Primary) 35D05; 76N10 (Secondary)

description: Local solutions of the multidimensional Navier-Stokes equations for isentropic compressible flow are constructed with spherically symmetric initial data between a solid core and a free boundary connected to a surrounding vacuum state. The viscosity coefficients $λ, μ$ are proportional to $ρ^θ}$, $01$ is the physical constant of polytropic fluid. It is also proved that no vacuum develops between the solid core and the free boundary, and the free boundary expands with finite speed.
description: 32 pages
Welsh Wreck Web Research Project (North Cardigan Bay). On-line research into the Sinking of: Lady Fielding (Schooner)
Creators: name: Davies, Gareth J.S.
Publisher: name: Archaeology Data Service
Year: 2024

description: Welsh Wreck Web Research Project unpublished report series, 1
description: This project is to discover information relating to the history of the schooner Lady Fielding (MADU Ref 380) built and launched at Chester in 1849. The Lady Fielding was a cargo schooner which sailed between North Wales, Ireland Northern Ireland, N.W. England, Scotland, South and East coasts of England. On Aug 11 1910, the schooner Lady Fielding was blown onto rocks and wrecked approximately 2 miles E of Aberdaron while sailing from Swansea to Llanidan, Anglesey. Although some spars and some wreckage were reported afloat it was of little value.
title: Reporting of flow diagrams in randomised controlled trials published in periodontology and implantology: a survey
Creators: name: Meyer, Gustav
name: Pandis, Nikolaos
name: Seehra, Jadbinder
name: Faggion, Clóvis Mariano
Publisher: name: University of Muenster, Institutional Repository MIAMI
Year: 2025
Subjects: subject: 610 Medicine and health

description: Background: Item 13 of the CONSORT guidelines recommends documentation of the participant flow in randomised clinical trials (RCTs) using a diagram. In the medical literature, the reporting of the flow of participants in RCTs has been assessed to be inadequate. The quality of reporting flow diagrams in periodontology and implantology remains unknown. The aim of this study was to assess the reporting of flow diagrams in RCTs published in periodontology and implantology journals. Materials and Methods: 
RCTs published between 15th January 2018 and 15th January 2022 in twelve high-ranked periodontology and implantology journals were identified. Trial characteristics at the RCT level were extracted. The flow diagram included in each RCT was assessed for completeness of reporting in relation to published criteria and the CONSORT flow diagram template. Results: From the 544 eligible articles, 85% were single-centre, 82% of parallel-group design and 79% investigated surgical interventions. Three-hundred and fifteen (58%) articles were published in CONSORT endorsing journals. A flow diagram was reported in 317 (58%) trials and reporting was more common in periodontology (73.1%). Overall, 56% of publications with a flow diagram reported a complete CONSORT flow diagram, while in 44% of flow diagrams, at least one point from the CONSORT reporting template was missing. Reasons for loss to follow-up (69.7%) and exclusions from the RCT analysis (86.4%) were poorly reported. Conclusion: The reporting of flow diagrams in periodontology and implantology RCTs was sub-optimal. Greater awareness of the importance of fully completing the participant CONSORT flow diagram is required.
description: Finanziert über die DEAL-Vereinbarung mit Wiley, Springer oder Elsevier 2019–2023.
Integrated molar absorptivity of mid- and far-infrared spectra of glycine and other selected amino acids
Creators: name: Iglesias-Groth, S.
name: Cataldo, F.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: A selection of five proteinogenic amino acids, namely glycine, isoleucine, phenylalanine, tyrosine and tryptophan were studied in the mid-infrared and in the far-infrared with the purpose to facilitate the search and identification of these astrobiological and astrochemical relevant molecules in space environments. The molar extinction coefficients (ε) of all mid- and far-infrared bands were determined as well as the integrated molar absorptivities (ψ). The mid-infrared spectra of the five selected amino acids were recorded also at three different temperatures from -180°C to ambient temperature to +200°C. We measure the wavelength shift of the infrared bands caused by temperature and, for the most relevant or temperature-sensitive infrared bands, a series of linear equations were determined relating wavelength position with temperature. Such equations may provide estimates of the temperature of these molecules once detected in astrophysical objects and with the reported values of ε and ψ, it will be possible to estimate the relative abundance of these molecules in space environments.
description: submitted to Astrobiology, 17 pages, 5 tables, 6 pages
Το έννομο αγαθό στο άρθρο 348Α ΠΚ
Creators: name: Βαφίνη, Θεοδώρα-Μαρία Πέτρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: πορνογραφία ανηλίκων
έννομο αγαθό
άρθρο 348Α ΠΚ
child pornography
protected legal interest
article 348A Criminal Code

description: Tο θέμα της παρούσας διπλωματικής εργασίας αποτελεί το αναφυόμενο ζήτημα του προστατευόμενου εννόμου αγαθού από την ποινική διάταξη του άρθρου 348Α που τιτλοφορείται Πορνογραφία Ανηλίκων και εντάσσεται στο 19ο Κεφάλαιο του Ειδικού Μέρους του Ποινικού Κώδικα , εκείνο των Εγκλημάτων κατά της γενετήσιας ελευθερίας. Για να μπορούμε όμως να αποκτήσουμε το δυνατόν σαφέστερη και αποκρυσταλλωμένη εικόνα για το προστατευόμενο ή και προστατευόμενα από τη διάταξη έννομα αγαθά στην παρούσα , επιλέγουμε να κάνουμε μια ιστορική αναδρομή στο κεφάλαιο 19 και στην πορεία από την έννοια των ηθών στην έννοια της γενετήσιας ελευθερίας. Στη συνέχεια ερευνούμε την πορεία προς την ποινικοποίηση παρόμοιων με τις τυποποιούμενες στο άρθρο 348A συμπεριφορές ,την εισαγωγή στον Ποινικό μας Κώδικα του άρθρου , ελέγχουμε τις νομοθετικές τροποποιήσεις του, διαλευκάνουμε κάποιες από τις βασικές έννοιες της εν λόγω διάταξης και αφού εξειδικεύσουμε και αναλύσουμε το προστατευόμενο ή προστατευόμενα έννομα αγαθά , εντοπίζουμε και ελέγχουμε τις βασικότερες συρροές που προκύπτουν από αξιόποινες συμπεριφορές που τυποποιούνται τόσο στη διάταξη περί πορνογραφίας ανηλίκων όσο και σε άλλες διατάξεις του Ποινικού μας Κώδικα αλλά και σε ποινικά αδικήματα που προέρχονται από ειδικούς νόμους.
description: The subject of this thesis is the emerging issue of the protected legal interests from criminal provision of article 348A entitled Pornography Minors and falls in the 19th Chapter of the Special Part of the Criminal Code, the part of Crimes against sexual freedom. In order to get the clearest possible picture and crystallized results for the protected legal interests by the provision, we choose to do a historical overview in Chapter 19 and in the process from the concept of morals in the sense of sexual freedom. Then we investigate the process of criminalization similar to the behaviors typified in Article 348A, introducing us to the Penal Code article, watching the legislative amendments, elucidate some of the basic concepts of that provision and after specialization and analyze the protected or protected legal interests, identify and control the key clusters arising from criminal behavior typified both the provision on child pornography and other provisions of our Criminal Code and the criminal offenses from special laws.