cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The equilibrium intrinsic crystal-liquid interface of colloids
Creators: name: Hernández-Guzmán, Jessica
name: Weeks, Eric R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We use confocal microscopy to study an equilibrated crystal-liquid interface in a colloidal suspension. Capillary waves roughen the surface, but locally the intrinsic interface is sharply defined. We use local measurements of the structure and dynamics to characterize the intrinsic interface, and different measurements find slightly different widths of this interface. In terms of the particle diameter $d$, this width is either $1.5d$ (based on structural information) or $2.4d$ (based on dynamics), both not much larger than the particle size. This work is the first direct experimental visualization of an equilibrated crystal-liquid interface.
description: 6 pages; revised version, submitted to PNAS
On the Distance to the Ophiuchus Star-Forming Region
Creators: name: Mamajek, Eric E.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The Ophiuchus molecular cloud complex has produced in Lynds 1688 the richest known embedded cluster within ~300 pc of the Sun. Unfortunately, distance estimates to the Oph complex vary by nearly ~40% (~120-165 pc). Here I calculate a new independent distance estimate of 135 +- 8 pc to this benchmark star-forming region based on Hipparcos trigonometric parallaxes to stars illuminating reflection nebulosity in close proximity to Lynds 1688. Combining this value with recent distance estimates from reddening studies suggests a consensus distance of 139 +- 6 pc (4% error), situating it within ~11 pc of the centroid of the ~5 Myr old Upper Sco OB subgroup of Sco OB2 (145 pc). The velocity vectors for Oph and Upper Sco are statistically indistinguishable within ~1 km/s in each vector component. Both Oph and Upper Sco have negligible motion (<1 km/s) in the Galactic vertical direction with respect to the Local Standard of Rest, which is inconsistent with the young stellar groups having formed via the high velocity cloud impact scenario.
description: to appear in Jan 2008 AN (5 pages), note added in proof regarding new distance estimate (131+-3 pc) using revised Hipparcos parallaxes
Spin Network Wavefunction and the Graviton Propagator
Creators: name: Mikovic, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We show that if the flat-spacetime wavefunction in the spin network basis of Loop Quantum Gravity has a large-spin asymptotics given by Rovelli's ansatz then the corresponding graviton propagator has the correct large-distance asymptotics nonperturbatively and independently of the spin foam model used to describe the evolution operator. We also argue that even in the Rovelli approach the wavefunction should satisfy the Hamiltonian constraint and we give an explanation for the spin parameter appearing in Rovelli's ansatz.
description: 8 pages
On the Dynamics of Proto-Neutron Star Winds and r-Process Nucleosynthesis
Creators: name: Panov, I. V.
name: Janka, H. -Th.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We study here the formation of heavy r-process nuclei in the high-entropy environment of rapidly expanding neutrino-driven winds from compact objects. In particular, we explore the sensitivity of the element creation in the A>130 region to the low-temperature behavior of the outflows. For this purpose we employ a simplified model of the dynamics and thermodynamical evolution for radiation dominated, adiabatic outflows. It consists of a first stage of fast, exponential cooling, followed by a second phase of slower evolution, either assuming constant density and temperature or a power-law decay of these quantities. These cases are supposed to capture the most relevant effects of a strong deceleration or decreasing acceleration of the transsonic outflows, respectively, e.g. in a wind termination shock caused by the collision with the slower, preceding supernova ejecta. We find that not only the transition temperature between the two expansion phases can make a big difference in the formation of the platinum peak, but also the detailed cooling law during the later phase. Unless the transition temperature and corresponding (free neutron) density become too small (T < 2*10^8 K), a lower temperature or faster temperature decline during this phase allow for a stronger appearance of the third abundance peak. Since the nuclear photodisintegration rates between ~2*10^8 K and ~10^9 K are more sensitive to the temperature than the n-capture rates are to the free neutron density, a faster cooling in this temperature regime shifts the r-process path closer to the n-drip line. With low (gamma,n)- but high beta-decay rates, the r-processing then does not proceed through a (gamma,n)-(n,gamma) equilibrium but through a quasi-equilibrium of (n,gamma)-reactions and beta-decays, as recently also pointed out by Wanajo.
description: 18 pages, 14 figures with 25 eps plots; referee comments included; accepted by Astronomy & Astrophysics
THE PRINCIPLE OF OPERATION OF ELECTRONIC CONSULTING TERMINALS ON THE EXAMPLE OF THE PROVISION OF SOCIAL AND LEGAL SERVICES
Creators: name: Kramarenko, L.
Publisher: name: Sciences of Europe
Year: 2021
Subjects: subject of social work
social service
electronic technologies
socially unprotected categories of families.

description: This article considers the need for the introduction of new computer technologies in the system of public administration of the social sphere of the Republic of Crimea. The possibility of using modern information technologies as a priority in the field of social protection of vulnerable groups is analyzed. On the example of the activities of social service centers for families, children and youth, ways to improve the provision of social and legal services through the use of electronic counseling terminals are proposed.
Electrostatic deposition of graphene in a gaseous environment: A deterministic route to synthesize rolled graphenes?
Creators: name: Sidorov, Anton
name: Mudd, David
name: Sumanasekera, Gamini
name: Ouseph, P. J.
name: Jayanthi, C. S.
name: Wu*, Shi-Yu
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The synthesis of single-wall carbon nanotubes (SWCNTs) of desired diameters and chiralities is critical to the design of nanoscale electronic devices with desired properties.1-6 The existing methods are based on self-assembly, 7-16 therefore lacking the control over their diameters and chiralities. The present work reports a direct route to roll graphene. Specifically, we found that the electrostatic deposition of graphene yielded: (i) flat graphene layers under high vacuum (10-7 Torr), (ii) completely scrolled graphene under hydrogen atmosphere, (iii) partially scrolled graphene under nitrogen atmosphere, and (iv) no scrolling for helium atmospheres. Our study shows that the application of the electrostatic field facilitates the rolling of graphene sheets exposed to appropriate gases and allows the rolling of any size graphene. The technique proposed here, in conjunction with a technique that produces graphene nanoribbons (GNRs) of uniform widths, will have significant impact on the development of carbon nanotube based devices. Furthermore, the present technique may be applied to obtain tubes/scrolls of other layered materials.
Coherent radio emission from a population of RS Canum Venaticorum systems
Creators: name: Toet, S. E. B.
name: Vedantham, H. K.
name: Callingham, J. R.
name: Veken, K. C.
name: Shimwell, T. W.
name: Zarka, P.
name: Röttgering, H. J. A.
name: Drabent, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Coherent radio emission from stars can be used to constrain fundamental coronal plasma parameters, such as plasma density and magnetic field strength. It is also a probe of chromospheric and magnetospheric acceleration mechanisms. Close stellar binaries, such as RS Canum Venaticorum (RS CVn) systems, are particularly interesting as their heightened level of chromospheric activity and possible direct magnetic interaction make them a unique laboratory to study coronal and magnetospheric acceleration mechanisms. RS CVn binaries are known to be radio-bright but coherent radio emission has only conclusively been detected previously in one system. Here, we present a population of 14 coherent radio emitting RS CVn systems. We identified the population in the ongoing LOFAR Two Metre Sky Survey as circularly polarised sources at 144MHz that are astrometrically associated with known RS CVn binaries. We show that the observed emission is powered by the electron cyclotron maser instability. We use numerical calculations of the maser's beaming geometry to argue that the commonly invoked 'loss-cone' maser cannot generate the necessary brightness temperature in some of our detections and that a more efficient instability, such as the shell or horseshoe maser, must be invoked. Such maser configurations are known to operate in planetary magnetospheres. We also outline two acceleration mechanisms that could produce coherent radio emission, one where the acceleration occurs in the chromosphere and one where the acceleration is due to an electrodynamic interaction between the stars. We propose radio and optical monitoring observations that can differentiate between these two mechanisms.
description: This article consists of 14 pages, 10 normal figures and 4 gifs. The gifs themselves each consist of 32 figures. This article is to be published in Astronomy and Astrophysics, section 8. 'Stellar Atmospheres'
Measuring evolving regional autonomy demands and statutes: introducing the Sub-state Autonomy Scale (SAS)
Creators: name: Niessen, Christoph
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Physical Sciences not elsewhere classified
subject: Medicine
subject: Genetics
subject: FOS: Biological sciences
subject: Sociology
subject: FOS: Sociology
subject: Developmental Biology
subject: Inorganic Chemistry
subject: FOS: Chemical sciences
subject: Mental Health
subject: Hematology
subject: Computational Biology

description: This article introduces the Sub-state Autonomy Scale (SAS), an indicator and database for autonomy demands and statutes at the sub-state level. The usefulness of the SAS comes with two analytical properties. First, it allows evaluating autonomy in kind (whether competences are administrative or legislative), in degree (how much each dimension is present) and by competences (as a function of the extent of comprised policy domains) at the same time. Second, it can be used for analysing both autonomy demands and statutes. Taken together, the two aim at a refined analysis of sub-state mobilization and restructuring as well as their interplay.
Abstractified Multi-instance Learning (AMIL) for Biomedical Relation Extraction
Creators: name: Hogan, William
name: Huang, Molly
name: Katsis, Yannis
name: Baldwin, Tyler
name: Kim, Ho-Cheol
name: Baeza, Yoshiki Vazquez
name: Bartko, Andrew
name: Hsu, Chun-Nan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computation and Language (cs.CL)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Relation extraction in the biomedical domain is a challenging task due to a lack of labeled data and a long-tail distribution of fact triples. Many works leverage distant supervision which automatically generates labeled data by pairing a knowledge graph with raw textual data. Distant supervision produces noisy labels and requires additional techniques, such as multi-instance learning (MIL), to denoise the training signal. However, MIL requires multiple instances of data and struggles with very long-tail datasets such as those found in the biomedical domain. In this work, we propose a novel reformulation of MIL for biomedical relation extraction that abstractifies biomedical entities into their corresponding semantic types. By grouping entities by types, we are better able to take advantage of the benefits of MIL and further denoise the training signal. We show this reformulation, which we refer to as abstractified multi-instance learning (AMIL), improves performance in biomedical relationship extraction. We also propose a novel relationship embedding architecture that further improves model performance.
description: 14 pages, 3 figures, submitted to Automated Knowledge Base Construction (2021)
The Mass Of The Coma Cluster From Weak Lensing In The Sloan Digital Sky Survey
Creators: name: Kubo, Jeffrey M.
name: Stebbins, Albert
name: Annis, James
name: Dell'Antonio, Ian P.
name: Lin, Huan
name: Khiabanian, Hossein
name: Frieman, Joshua A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a weak lensing analysis of the Coma Cluster using the Sloan Digital Sky Survey (SDSS) Data Release Five. Complete imaging of a ~ 200 square degree region is used to measure the tangential shear of this cluster. The shear is fit to an NFW model and we find a virial radius of r_{200}=1.99_{-0.22}^{+0.21}h^{-1}Mpc which corresponds to a virial mass of M_{200}=1.88_{-0.56}^{+0.65}\times10^{15}h^{-1}M_{\odot}. We additionally compare our weak lensing measurement to the virial mass derived using dynamical techniques, and find they are in agreement. This is the lowest redshift, largest angle weak lensing measurement of an individual cluster to date.
description: Accepted to ApJ, 16 pages (preprint format), 3 figures
Are There Magnetars in High Mass X-ray Binaries? The Case of SuperGiant Fast X-Ray Transients
Creators: name: Bozzo, E.
name: Falanga, M.
name: Stella, L.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In this paper we survey the theory of wind accretion in high mass X-ray binaries hosting a magnetic neutron star and a supergiant companion. We concentrate on the different types of interaction between the inflowing wind matter and the neutron star magnetosphere that are relevant when accretion of matter onto the neutron star surface is largely inhibited; these include the inhibition through the centrifugal and magnetic barriers. Expanding on earlier work, we calculate the expected luminosity for each regime and derive the conditions under which transition from one regime to another can take place. We show that very large luminosity swings (~10^4 or more on time scales as short as hours) can result from transitions across different regimes. The activity displayed by supergiant fast X-ray transients, a recently discovered class of high mass X-ray binaries in our galaxy, has often been interpreted in terms of direct accretion onto a neutron star immersed in an extremely clumpy stellar wind. We show here that the transitions across the magnetic and/or centrifugal barriers can explain the variability properties of these sources as a results of relatively modest variations in the stellar wind velocity and/or density. According to this interpretation we expect that supergiant fast X-ray transients which display very large luminosity swings and host a slowly spinning neutron star are characterized by magnetar-like fields, irrespective of whether the magnetic or the centrifugal barrier applies. Supergiant fast X-ray transients might thus provide a new opportunity to detect and study magnetars in binary systems.
description: Accepted for publication in ApJ. 16 pages, 6 figures
A method to distinguish between micro- and macro-granular surfaces of small Solar System bodies
Creators: name: Bischoff, D.
name: Gundlach, B.
name: Blum, J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: The surface granularity of small Solar System bodies is diverse through the different types of planetary bodies and even for specific objects it is often not known in detail. One of the physical properties that strongly depends on the surface structure is the surface temperature. In highly porous media with large voids, radiation can efficiently transport heat, whereas more compact, micro-porous structures transport the heat primarily by conduction through the solid material. In this work, we investigate under which conditions a macro-porous surface can be distinguished from a micro-porous one by simply measuring the surface temperature. In our numerical simulations, we included circular and elliptical orbits with and without obliquity and varied the rotation period of the considered objects. We found that daily temperature cycles are rather insensitive to the specific surface granularity. However, the surface temperature at sunrise shows significant dependency on the material structure and this effect becomes even more pronounced when the solar intensity increases. By measuring the sunrise temperature as a function of insolation at noon, a differentiation between micro- and macro-granular surface structures is possible. In this paper, we provide a strategy how remote sensing can be used to derive the surface structure of small Solar System bodies.
description: accepted by MNRAS
Determination of the elastic moduli of CVD graphene by probing graphene/polymer Bragg stacks
Creators: name: Liu, Bohai
name: Pavlou, Christos
name: Wang, Zuyuan
name: Cang, Yu
name: Galiotis, Costas
name: Fytas, George
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Graphene has been widely used in the form of micro-flakes to fabricate composite materials with enhanced mechanical properties. Due to the small size of the inclusions and their random orientation within the matrix, the superior mechanical properties of graphene cannot be fully exploited. Recently, attempts have been made to fabricate nanolaminate composites by interleaving large sheets of chemical vapor deposition (CVD) monolayer graphene between thin layers of polymer matrices. However, CVD graphene is inevitably accompanied by wrinkles that are formed in the synthesis process, and it remains unknown how the wrinkles affect the mechanical properties of graphene. Here, we employ Brillouin Light Spectroscopy (BLS) to study the elastic moduli of CVD graphene by probing graphene/poly(methylmethacrylate) hybrid Bragg stacks at zero strain. We find the Young's and shear moduli of the CVD graphene, which has wrinkles in the form of sharp elevations of height of about 6 nm and a FWHM of ca. 30 nm, to be 680 and 290 GPa, respectively, with the former being about 30% lower than that of exfoliated, flat graphene. This work sheds light on the elastic properties of CVD graphene and provides a method that can be extended to studying the wrinkle-induced softening effect in other two-dimensional materials.
description: Paper and Supporting Info
Generalized rainbow patterns of oblate drops simulated by a ray model in three dimensions
Creators: name: Duan, Qingwei
name: Onofri, F.
name: Han, Xiang'e
name: Ren, Kuan Fang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The scattering patterns near the primary rainbow of oblate drops are simulated by extending the vectorial complex ray model (VCRM) [1] to three-dimensional (3D) calculations. With the curvature of wavefront as intrinsic property of a ray, this advanced ray model permits, in principle, to predict the amplitudes and phases of all emergent rays with a rigorous algebraic formalism. This letter reports a breakthrough of VCRM for 3D scattering with a line-by-line triangulation interpolation algorithm allowing to calculate the total complex amplitude of scattered f eld. This makes possible to simulate not only the skeleton (geometrical rainbow angles, hyperbolic-umbilic caustics), but also the coarse (Airy bows, lattice) and f ne (ripple fringes) structures of the generalized rainbow patterns (GRPs) of oblate drops. The simulated results are found qualitatively and quantitatively in good agreement with experimental scattering patterns for drops of different aspect ratios. The physical interpretation of the GRPs is also given. This work opens up prominent perspectives for simulating and understanding the 3D scattering of large particles of any shape with smooth surface by VCRM.
On the Phase Diagram of Spin-Polarized Attractive Hubbard Model: Weak Coupling Limit
Creators: name: Kujawa, Agnieszka
name: Micnas, Roman
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The superfluid properties of the attractive Hubbard model in a Zeeman magnetic field, and in the weak coupling regime have been investigated. The temperature and magnetic field dependencies of the order parameter have been analyzed. Furthermore, the temperature vs. magnetic field and temperature vs. spin polarization phase diagrams for the 2D and 3D lattices have been obtained. For some parameters a reentrant transition has been found.
description: 9 pages, 4 figures, Proceedings of the XIII National School Superconductivity, Spin And Charge Ordering, Ladek-Zdroj, November 6-10, 2007
An exactly solvable problem of wave fronts and applications to the asymptotic theory
Creators: name: Brezhnev, Yu.
name: Tsvetkova, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: This is the full and extended version of the brief note arXiv:1908.00938. A nontrivially solvable 4-dimensional Hamiltonian system is applied to the problem of wave fronts and to the asymptotic theory of partial differential equations. The Hamilton function we consider is $H(\mathbf x,\mathbf p)=\sqrt{D(\mathbf{x})}|\mathbf{p}|$. Such Hamiltonians arise when describing the fronts of linear waves generated by a localized source in a basin with a variable depth. We consider two \emph{realistic} types of bottom shape: 1) the depth of the basin is determined, in the polar coordinates, by the function $D(\varrho,φ)=(\varrho^2+b)/(\varrho^2+a)$ and 2) the depth function is $D(x,y)=(x^2+b)/(x^2+a)$. As an application, we construct the asymptotic solution to the wave equation with localized initial conditions and asymptotic solutions of the Helmholtz equation with a localized right-hand side.
description: LaTeX, 15 pages, 4 figures
Combining technological relatedness and sectoral specialization for improving prioritization in Smart Specialisation
Creators: name: Panori, Anastasia
name: Kakderi, Christina
name: Dimitriadis, Ilias
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Medicine
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Infectious Diseases
subject: FOS: Health sciences
subject: Computational Biology

description: Relatedness is a popular concept for regional branching within Smart Specialisation. However, this proximity-network approach misses its regional perspective, making difficult its operationalization in regional policies. This paper advances the regional perspective of relatedness for improving prioritization in Smart Specialisation by combining the concepts of technological relatedness and sectoral specialization. Using a four-stage methodology, we reveal potential Smart Specialisation priorities for a set of 16 European regions considering both cognitive links arising through technological relatedness and their regional structures. The proposed methodology reduces the stress of regional stakeholders participating in entrepreneurial discovery processes by providing a narrower set of priorities.
Effects of geometric constraints on the nuclear multifragmentation process
Creators: name: Souza, S. R.
name: Donangelo, R.
name: Lynch, W. G.
name: Tsang, M. B.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We include in statistical model calculations the facts that in the nuclear multifragmentation process the fragments are produced within a given volume and have a finite size. The corrections associated with these constraints affect the partition modes and, as a consequence, other observables in the process. In particular, we find that the favored fragmenting modes strongly suppress the collective flow energy, leading to much lower values compared to what is obtained from unconstrained calculations. This leads, for a given total excitation energy, to a nontrivial correlation between the breakup temperature and the collective expansion velocity. In particular we find that, under some conditions, the temperature of the fragmenting system may increase as a function of this expansion velocity, contrary to what it might be expected.
description: 16 pages, 5 figures
Comprehensive and automated Linear Interaction Energy based binding-affinity prediction applied to Cytochrome P450 aromatase inhibitors
Creators: name: van Dijk, Marc
name: Capoferri, Luigi
name: Vermeulen, Nico P. E.
name: Geerke, Daan P.
Publisher: name: Zenodo
Year: 2016

description: Poster presented at EuroQSAR 2016.
A blessing or curse: the spillover effects of city–county consolidation on local economies
Creators: name: Deng, Nanxin
name: Feng, Bo
name: Partridge, Mark D.
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Environmental Sciences not elsewhere classified
subject: Ecology
subject: FOS: Biological sciences
subject: Sociology
subject: FOS: Sociology
subject: Cancer
subject: Computational Biology

description: Previous studies suggest that ‘city–county consolidation’ has significant positive impacts on urban economic growth. Yet, the specific spillover effects on surrounding rural areas and the overall net impact on larger regions have not been fully investigated. We propose a difference-in-difference framework and find that consolidations have led to a significant loss of per capita gross domestic product (GDP) in nearby rural areas. The backwash mainly comes from the reduction of rural industrial output. We also find that this policy has an insignificant impact at the prefecture level, suggesting such consolidations do not promote aggregate growth and that any gains in urban areas are offset by losses in surrounding rural regions.
An Improbable Solution to the Underluminosity of 2M1207B: A Hot Protoplanet Collision Afterglow
Creators: name: Mamajek, Eric E.
name: Meyer, Michael R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We introduce an alternative hypothesis to explain the very low luminosity of the cool (L-type) companion to the ~25 M_Jup ~8 Myr-old brown dwarf 2M1207A. Recently, Mohanty et al. (2007) found that effective temperature estimates for 2M1207B (1600 +- 100 K) are grossly inconsistent with its lying on the same isochrone as the primary, being a factor of ~10 underluminous at all bands between I (0.8 um) and L' (3.6 um). Mohanty et al. explain this discrepency by suggesting that 2M1207B is an 8 M_Jup object surrounded by an edge-on disk comprised of large dust grains producing 2.5^m of achromatic extinction. We offer an alternative explanation: the apparent flux reflects the actual source luminosity. Given the temperature, we infer a small radius (~49,000 km), and for a range of plausible densities, we estimate a mass < M_Jup. We suggest that 2M1207B is a hot protoplanet collision afterglow and show that the radiative timescale for such an object is >~1% the age of the system. If our hypothesis is correct, the surface gravity of 2M1207B should be an order of magnitude lower than predicted by Mohanty et al. (2007).
description: ApJ Letters, in press (11 pages)
A cent a pound or on the ground : Okanagan fruit growers and marketing, 1920-1935
Creators: name: Dendy, David
Publisher: name: University of British Columbia
Year: 2010

description: Between 1920 and 1935 "the Okanagan fruit industry was in almost continual crisis because of the problems of selling an ever-expanding fruit crop on Canadian and especially Prairie markets which were no longer growing as fast as they had been when the orchards were planted. Difficulties were increased because a minority of growers and shippers refused to cooperate in various schemes of market control devised to regulate supply to the market and thus to stabilize prices. Both a cooperative selling agency, Associated Growers, and several cartels including independent shippers failed in their objects because the portion of the crop outside their control prevented successful marketing strategies. The provincial Produce Marketing Act of 1927, passed at the growers' request, provided some stability but was invalidated by the courts in 1931. After the 1932 sales disaster, when most growers received less than cost of production, they took direct action. The Growers' Strike of 1933 used mass meetings, vigilante squads, and intimidation to force all growers and shippers in the Valley to cooperate in a stabilization scheme based on two novel principles: that growers should control distribution of their fruit until it was actually sold, and that it should not be sold unless a minimum price was achieved. The growers' economic radicalism was not a deep-seated political conversion, but only their reaction to economic frustration. When the federal government, at the behest of their representative, in 1934 passed the Natural Products Marketing Act setting up a marketing control board, growers readily abandoned direct action and direct control.
Nature and distribution of iron sites in a sodium silicate glass investigated by neutron diffraction and EPSR simulation
Creators: name: Weigel, Coralie
name: Cormier, L.
name: Calas, Georges
name: Galoisy, Laurence
name: Bowron, Daniel
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The short and medium range structure of a NaFeSi2O6 (NFS) glass has been investigated by high-resolution neutron diffraction with Fe isotopic substitution, combined with Empirical Potential Structure Refinement (EPSR) simulations. The majority (~60%) of Fe is 4-coordinated ([4]Fe) and corresponds only to ferric iron, Fe3+, with a distance d[4]Fe3+-O=1.87$\pm$0.01Å . This is at variance with the 3D-structure predicted by glass stoichiometry. The existence of a majority of [4]Fe3+ sites illustrates a glass structure that differs from the structure of crystalline NaFeSi2O6, which contains only octahedral Fe3+. The EPSR modeling of glass structure shows that [4]Fe3+ is randomly distributed in the silicate network and shares corner with silicate tetrahedra. The existence of a majority of [4]Fe3+ sites differs from the structure of the corresponding crystalline phase, which contains only octahedral Fe3+. The network-forming behavior of [4]Fe3+, coupled with the presence of Na+ ions acting as charge-compensators, is at the origin of peculiar physical properties of Fe-bearing glasses, such as the increase of the elastic modulus of sodium silicate glasses with increasing Fe-concentration. Our data provide also direct evidence for 5-coordinated Fe, with an average distance d[5]Fe-O=2.01$\pm$0.01Å. This second Fe population concerns both Fe2+ and Fe3+. 5-coordinated Fe atoms tend to segregate by sharing mainly edges. The direct structural evidence of the dual role of ferric iron in NFS glass provides support for understanding the peculiar properties of NFS glass, such as magnetic, optical, electronic or thermodynamic properties.
Exploring pooling methods in deep metric learning: A performance analysis on benchmark datasets
Creators: name: Tsigarida, Despoina
Publisher: name: National Technological University of Athens
Year: 2025
Subjects: Computer vision
Υπολογιστική όραση
Deep metric learning
Βαθιά μετρική μάθηση
Neural networks
Νευρωνικά δίκτυα
Image retrieval
Αναζήτηση εικόνας

description: Εθνικό Μετσόβιο Πολυτεχνείο--Μεταπτυχιακή Εργασία. Διεπιστημονικό-Διατμηματικό Πρόγραμμα Μεταπτυχιακών Σπουδών (Δ.Π.Μ.Σ.) “Γεωπληροφορική”
Multiple electron acceleration instances during a series of solar microflares observed simultaneously at X-rays and microwaves
Creators: name: Battaglia, Marina
name: Sharma, Rohit
name: Luo, Yingjie
name: Chen, Bin
name: Yu, Sijie
name: Krucker, Säm
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Even small solar flares can display a surprising level of complexity regarding their morphology and temporal evolution. Many of their properties, such as energy release and electron acceleration can be studied using highly complementary observations at X-ray and radio wavelengths. We present X-ray observations from the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) and radio observations from the Karl G. Jansky Very Large Array (VLA) of a series of GOES A3.4 to B1.6 class flares observed on 2013 April 23. The flares, as seen in X-ray and extreme ultraviolet (EUV), originated from multiple locations within active region NOAA 11726. A veritable zoo of different radio emissions between 1 GHz and 2 GHz was observed co-temporally with the X-ray flares. In addition to broad-band continuum emission, broad-band short-lived bursts and narrow-band spikes, indicative of accelerated electrons, were observed. However, these sources were located up to 150 arcsec away from the flaring X-ray sources but only some of these emissions could be explained as signatures of electrons that were accelerated near the main flare site. For other sources, no obvious magnetic connection to the main flare site could be found. These emissions likely originate from secondary acceleration sites triggered by the flare, but may be due to reconnection and acceleration completely unrelated to the co-temporally observed flare. Thanks to the extremely high sensitivity of the VLA, not achieved with current X-ray instrumentation, it is shown that particle acceleration happens frequently and at multiple locations within a flaring active region.
description: accepted for publication in ApJ
Eotetranychus herbicolus Flechtmann, 2004, n.sp.
Creators: name: Flechtmann, Carlos H. W.
Publisher: name: Zenodo
Year: 2004
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Prostigmata
Tetranychidae
Eotetranychus
Eotetranychus herbicolus

description: Eotetranychus herbicolus n.sp.
(Figs. 2–11)
 Diagnosis — Female palptarsus sensillum thick; peritremes ending in a hook. Male aedeagus bent down, sinuous, distal part tapering.
 Female (n = 2) — Prodorsal striae longitudinal; prodorsal setae long, slender, pubescent. Length of setae: v2 65 (65), 58 (61) apart; sc1 105 (98), 84 (89) apart; sc2 70 (68). Peritreme hooked distally.
Palptarsus terminal eupathidium (spinneret) 6.1 long, 3.5 in diameter; two lateral eupathidia 6 and 9 long; solenidion 4.5 long.
 Hysterosomal striation transverse. Hysterosomal dorsal setae pubescent, longer than longitudinal distances between bases of consecutive setae: c1 89 (86), 75 (77) apart; c2 89 (84); c3 82 (79); d1 89, 84 (82) apart; d2 89; e1 82, 63 apart; e2 89; f1 79 (82), 61 (63) apart; f2 77 (79); h1 68 (72), 30 (35) apart; h3 23 (26). Paraanal setae h3 located ventrally.
Ventral idiosomal striation transverse; striae on the genital falp and the area immediately anterior transverse.
Leg chaetotaxy, from coxae to tarsi (solenidia in parentheses; in brackets alternate count from paratype):
Leg I 2 – 1 – 9 – 5 – 9 (1) – 13 [14] (1) + 2 duplexes
Leg II 2 – 1 – 7 – 5 – 8 – 13 (1) + 1 duplex
Leg III 1 – 1 – 4 – 4 – 6 [5] – 10 (1) [9 (1)]
Leg IV 1 – 1 – 4 [3] – 4 – 7 – 8 (1) [10 (1)].
Length of body, including gnathosoma, 569, excluding gnathosoma 391; width 275.
 Male (n = 1) — Palptarsus terminal eupathidium (spinneret) small, knoblike; two lateral eupathidia 6 and 7 long; solenidion 5 long.
Leg chaetotaxy, from coxae to tarsi (solenidia in parentheses):
Leg I 2 – 1 – 9 – 5 – 9 (3) – 13 (3) + 2 duplexes
Leg II 2 – 1 – 7 – 5 – 8 – 13 (2) + 1 duplex
Leg III 1 – 1 – 4 – 4 – 6 – 10 (1)
Leg IV 1 – 1 – 4 – 4 – 7 – 10 (1)
Aedeagus bent down, sinuous, tapering to a fine end.
Length of body, not including rostrum, 315.
 Type material — male holotype and 2 female paratypes, from leaves of a grass, Brachiaria ruziziensis Germain & Evrard (Poaceae), Ribeirão Bonito, São Paulo, Brazil, 23 April 2004, coll. P.E.B. Paiva, on one microscopic preparation in the collection of Departamento de Entomologia, Fitopatologia e Zoologia Agrícola, Universidade de São Paulo/ ESALQ, Piracicaba, SP, Brazil.
 Etymology — The specific designation is made up of the Latin herba, soft usually green vegetation, referring to the host plant, plus the Latin colus, dweller, inhabitant.
 Remarks — The aedeagus of the n.sp. resembles that of E. obtusus Meyer, 1965 (however, in E. obtusus ends in a blunt tip) and that of E. roedereri Gutierrez, 1967. It differs from both in leg chaetotaxy.
description: Published as part of Flechtmann, Carlos H. W., 2004, Two new plant feeding mites from Brachiaria ruziziensis in citrus groves in São Paulo, Brazil and new distribution records of other plant mites in Brazil, pp. 1-11 in Zootaxa 708 on pages 4-8, DOI: 10.5281/zenodo.158803
H2020 TWEETHER Final Public Report
Creators: name: Paoloni, Claudio
Publisher: name: Zenodo
Year: 2018
Subjects: point to multipoint
Traveling wave tube
w-band
millimeter waves
5g
backhaul
fixed wireless access

description: Final public report of European Commission H2020 TWEETHER Travelling wave tube based w‐band wireless networks with high data rate distribution, spectrum & energy efficiency
การสร้างและหาประสิทธิภาพบทเรียนคอมพิวเตอร์ช่วยสอน เรื่อง สมรรถภาพทางกาย
Creators: name: วิรัช  รักษาสกุล
Publisher: name: มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร
Year: 2007
Subjects: บทเรียนคอมพิวเตอร์ช่วยสอน

description: 1, 1, วารสารวิชาการและวิจัย มทร.พระนคร
Neopetasan, the main component of the essential oil from Cyperus sesquiflorus (Cyperaceae)
Creators: name: Ferreira, Cassia Sousa
name: Alves, Péricles Barreto
name: dos Reis Moraes, Aline
name: do Nascimento Prata, Ana Paula
name: Assunção, Andressa Cristina Ribeiro
name: da Silva, Sâmia Andrícia Souza
name: do Nascimento, Ticiano Gomes
name: Braz-Filho, Raimundo
name: Costa, Emmanoel Vilaça
Publisher: name: Taylor & Francis
Year: 2024
Subjects: subject: Biochemistry
subject: Pharmacology
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: FOS: Biological sciences
subject: Biological Sciences not elsewhere classified

description: Cyperus sesquiflorus is commonly called fragrant kyllinga, fragrant spikesedge, or fragrant flatsedge. It is a cespitose perennial herb with a Pantropical distribution. In Brazil, it is a native species, being commonly named fragrant grass due to its aromatic content. In this study, the essential oil (EO) of C. sesquiflorus was extracted by hydrodistillation with a Clevenger apparatus. Yields of the samples ranged between 0.12% and 0.27% (v/w) oils from fresh and dehydrated whole flowering plants (with roots) and the oil was analyzed by Gas Chromatography/-Mass spectrometry/flame ionization detection (GC-MS/FID) and Gas chromatography/Mass spectroscopy (GC/MS). The main constituent of the oil, neopetasan (3S,4aR,5S)-4a,5-dimethyl-3-(prop-1-en-2-yl)-4,4a,5,6,7,8 hexahydronaphthalen-2(3 H)-one, was isolated by preparative thin layer chromatography (PTLC) and its structure was elucidated by extensive one- and two-dimensional nuclear magnetic resonance (1D/2D-NMR) (COSY, HSQC, HMBC, and NOESY) and Fourier transform infrared (FTIR) spectroscopy in combination with MS and comparison with literature data.
การพัฒนาผลิตภัณฑ์พริกแกงสำเร็จรูปเพื่ออุตสาหกรรมการส่งออก
Creators: name: วลัย  หุตะโกวิท
Publisher: name: มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร
Year: 2007
Subjects: พริกแกง, อุตสาหกรรมการส่งออก

description: 1, 1, วารสารวิชาการและวิจัย มทร.พระนคร
Co production through environmental monitoring and other ways of knowing? An interview study with scientists on Svalbard
Creators: name: Zhang, Jasmine
Publisher: name: Zenodo
Year: 2021
Subjects: Svalbard
Environmental monitoring
environmental change
co-production of knowledge
natural scientists
in-depth interview

description: There has been, both within social science and humanities, and natural science and technologies, an increasing interest and demand on co-producing knowledge on environmental changes across different ways of knowing. Situating the meta-narrative of co-production of knowledge in Svalbard, the high Arctic archipelago, here we focus specifically on the potential of co-producing knowledge through environmental monitoring and other ways of knowing the environmental changes on Svalbard. Through talking to natural scientists who have experiences in monitoring and long-term research on Svalbard, we discuss the tensions might generate from the practice of it and how we could view these tensions productively. While tensions and uncertainties were expressed by scientists regarding their monitoring activities and long-term research, place-attachment and other social aspects of knowledge-making seem to force environmental monitoring into directions that include knowledge and understanding from other disciplines and possibly also those from outside the scientific arena.
title: Ανάπτυξη υβριδικών ημιαγώγιμων συστημάτων παρουσία νανοδομημένων ενώσεων άνθρακα
titleType: AlternativeTitle
title: Development of hybrid semiconductive systems in the presence of nanostructured carbon compounds
Creators: name: Zygogiannis, Giorgos
Publisher: name: National Technological University of Athens
Year: 2025
Subjects: Υβριδικοί ημιαγωγοί
Ηλεκτροαπόθεση
Παλμικό ρεύμα
Σεληνιούχο κάδμιο
Λεπτά υμένια

description: Εθνικό Μετσόβιο Πολυτεχνείο--Μεταπτυχιακή Εργασία. Διεπιστημονικό-Διατμηματικό Πρόγραμμα Μεταπτυχιακών Σπουδών (Δ.Π.Μ.Σ.) “Επιστήμη και Τεχνολογία Υλικών”
L'Effet  de la qualité perçue du riz local sur l'intention d'achat des ménages sénégalais
Creators: name: DIOUF PAPA, Khar
name: DOUCOURE, Balla
name: DANCOKO, Ibrahima
Publisher: name: Zenodo
Year: 2023
Subjects: « qualité perçue », « intention d'achat », « risque perçu », « l'approche PLS », « ménages sénégalais »

description: L’objectif primordial de cet article est d’étudier l’effet de la qualité perçue du riz local  sur l’intention d’achat des ménages sénégalais. Afin d’identifier les liens directs ou indirects entre ces variables nous avons mené une recherche quantitative auprès de 285 ménages. Nous utilisons la modélisation par les équations structurelles avec l’approche PLS (Partial Least Square) pour tester nos hypothèses. Les résultats montrent que la qualité perçue du riz  influence positivement l’intention  d’achat du riz des ménages  sénégalais.
The Magnetic Rayleigh-Taylor Instability in Three Dimensions
Creators: name: Stone, James M.
name: Gardiner, Thomas
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We study the magnetic Rayleigh-Taylor instability in three dimensions, with focus on the nonlinear structure and evolution that results from different initial field configurations. We study strong fields in the sense that the critical wavelength l_c at which perturbations along the field are stable is a large fraction of the size of the computational domain. We consider magnetic fields which are initially parallel to the interface, but have a variety of configurations, including uniform everywhere, uniform in the light fluid only, and fields which change direction at the interface. Strong magnetic fields do not suppress instability, in fact by inhibiting secondary shear instabilities, they reduce mixing between the heavy and light fluid, and cause the rate of growth of bubbles and fingers to increase in comparison to hydrodynamics. Fields parallel to, but whose direction changes at, the interface produce long, isolated fingers separated by the critical wavelength l_c, which may be relevant to the morphology of the optical filaments in the Crab nebula.
description: 14 pages, 9 pages, accepted by ApJ
Design and performance evaluation of a semi-circular breakwater using cmputational fluid dynamics (CFD)
Creators: name: Kalantzi, Varvara
Publisher: name: National Technological University of Athens
Year: 2025
Subjects: Semicircular breakwater
Waves
Turbulence
CFD

description: Εθνικό Μετσόβιο Πολυτεχνείο--Μεταπτυχιακή Εργασία. Διεπιστημονικό-Διατμηματικό Πρόγραμμα Μεταπτυχιακών Σπουδών (Δ.Π.Μ.Σ.) “Υπολογιστική Μηχανική”
Percepciones positivas y negativas de los impactos socioeconómicos generados por las plataformas on line de alquiler de viviendas turísticas a corto plazo.
Creators: name: Prados-Castillo, Juan F
Publisher: name: Zenodo
Year: 2020

description: Ponencia congreso 'Fifteenth International Conference on Interdisciplinary Social Sciences at the National and Kapodistrian University of Athens, 20–22 July 2020'
A Low Complexity Learning-based Channel Estimation for OFDM Systems with Online Training
Creators: name: Mei, Kai
name: Liu, Jun
name: Zhang, Xiaoying
name: Cao, Kuo
name: Rajatheva, Nandana
name: Wei, Jibo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: In this paper, we devise a highly efficient machine learning-based channel estimation for orthogonal frequency division multiplexing (OFDM) systems, in which the training of the estimator is performed online. A simple learning module is employed for the proposed learning-based estimator. The training process is thus much faster and the required training data is reduced significantly. Besides, a training data construction approach utilizing least square (LS) estimation results is proposed so that the training data can be collected during the data transmission. The feasibility of this novel construction approach is verified by theoretical analysis and simulations. Based on this construction approach, two alternative training data generation schemes are proposed. One scheme transmits additional block pilot symbols to create training data, while the other scheme adopts a decision-directed method and does not require extra pilot overhead. Simulation results show the robustness of the proposed channel estimation method. Furthermore, the proposed method shows better adaptation to practical imperfections compared with the conventional minimum mean-square error (MMSE) channel estimation. It outperforms the existing machine learning-based channel estimation techniques under varying channel conditions.
description: 12 pages, 12 figures. To appear in IEEE Transactions on Communications
รูปแบบการเรียนของนกศึกษา สถาบันเทคโนโลยีราชมงคล วิทยาเขตโชติเวช
Creators: name: วิไลลักษณ์  ตางาม
Publisher: name: มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร
Year: 2007
Subjects: รูปแบบการเรียน

description: 1, 1, วารสารวิชาการและวิจัย มทร.พระนคร