cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
On a c(t)-Modified Friedman-Lemaitre-Robertson-Walker Universe
Creators: name: Fletcher, Robert C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: This paper presents a compelling argument for the physical light speed in the homogeneous and isotropic Friedman-Lemaitre-Robertson-Walker (FLRW) universe to vary with the cosmic time coordinate t of FLRW. It will be variable when the radial co-moving differential coordinate of FLRW is interpreted as physical and therefor transformable by a Lorentz transform locally to differentials of stationary physical coordinates. Because the FLRW differential radial distance has a time varying coefficient a(t), in the limit of a zero radial distance the light speed c(t) becomes time varying, proportional to the square root of the derivative of a(t) Since we assume homogeneity of space, this derived c(t) is the physical light speed for all events in the FLRW universe. This impacts the interpretation of astronomical observations of distant phenomena that are sensitive to light speed. A transform from FLRW is shown to have a physical radius out to all radial events in the visible universe. This shows a finite horizon beyond which there are no galaxies and no space. The general relativity (GR) field equation to determine a(t) and c(t) is maintained by using a variable gravitational constant and rest mass that keeps constant the gravitational and particle rest energies. This keeps constant the proportionality constant between the GR tensors of the field equation and conserves the stress-energy tensor of the ideal fluid used in the FLRW GR field equation. In the same way all of special and general relativity can be extended to include a variable light speed.
description: 60 pages, 5 figures. Simplified the definition of "physical coordinates". Pointed out that direct measurement of c(t) is difficult when measuring tools such as meter sticks vary with c(t). Eliminated suggestion that c(t) might explain apparent accelerating universe because the simple model of the dependence on c(t) of the radiation from supernova Ia doesn't seem to fit the observed data
The background for the use of hartmetals and MMCs based on Niobium Carbide (NbC) as cutting tools and for wear resistant tribosystems
Creators: name: Woydt, M.
name: Mohrbacher, H.
Publisher: name: International Conference on Stone and Concrete Machining (ICSCM)
Year: 2015
Subjects: NbC; niobium carbide; cobalt; Fe3Al; hardmetal; metal matric composite; wear resistance; cutting; milling

description: In this present study, the mechanical properties (strength, hardness, moduli) and the dry
sliding properties of stoichiometric and sub-stoichiometric NbC were compared. Microhardness
and elastic properties of NbC depend from the C/Nb ratio, because the binary
phase diagram Nb-C shows a region of homogeneity of NbCx of 0,72≤ x ≤1.0. At RT, hard
metals of stoichiometric NbC have an elastic modulus E of ~440 GPa, those of substochiometric
NbC0,88 an E of 405 GPa. The hot hardness of sub-stoichiometric NbC is above
600°C higher than of WC. The dry sliding wear resistance (0,1-7/10 m/s) of the present
Fe3Al-NbC0,94 with ~61 vol.-% NbC as hard phase was close to those known of NbC-based
hard metals. No grain pull-outs or fragmentations of the NbC grains were seen in the wear
tracks of the Fe3Al-NbC composite (MMC), as a metallurgical interphase was formed
between matrix and NbC grains. Stoichiometric and sub-stoichiometric niobium carbides
have at RT and 400°C under dry sliding a prone intrinsic wear resistance more or less independent
from sliding speed, either as hardmetal or as hard phase in metal matrix composite,
associated with an exceptional high load carrying capacity.
description: International Conference on Stone and Concrete Machining (ICSCM), Vol 3 (2015)
Lyot Coronagraphy on Giant Segmented-Mirror Telescopes
Creators: name: Sivaramakrishnan, Anand
name: Yaitskova, Natalia
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a study of Lyot style (i.e., classical, band-limited, and Gaussian occulter) coronagraphy on extremely large, highly-segmented telescopes. We show that while increased telescope diameter is always an advantage for high dynamic range science (assuming wavefront errors have been corrected sufficiently well), segmentation itself sets a limit on the performance of Lyot coronagraphs. Diffraction from inter-segment gaps sets a floor to the achievable extinction of on-axis starlight with Lyot coronagraphy. We derive an analytical expression for the manner in which coronagraphic suppression of an on-axis source decreases with increasing gap size when the segments are placed in a spatially periodic array over the telescope aperture, regardless of the details of the arrangement. A simple Lyot stop masking out pupil edges produces good extinction of the central peak in the point-spread function (PSF), but leaves satellite images caused by inter-segment gaps essentially unaffected. Masking out the bright segment gaps in the Lyot plane with a reticulated mask reduces the satellite images'intensity to a contrast of 5x10^{-9} on a 30 m telescope with 10 mm gaps, at the expense of an increase in the brightness of the central peak. The morphology of interesting targets will dictate which Lyot stop geometry is preferable: the reticulated Lyot stop produces a conveniently uni-modal PSF, whereas a simple Lyot stop produces an extended array of satellite spots. A cryogenic reticulate Lyot stop will also benefit both direct and coronagraphic mid-IR imaging.
description: 4 pages, 2 figures
Abrasion resistant materials on Fe-base
Creators: name: Theisen, W.
Publisher: name: International Conference on Stone and Concrete Machining (ICSCM)
Year: 2015
Subjects: Abrasion; wear mechanisms; metals; experimental investigation; simulation

description: Abrasion is one of the four main wear mechanisms that is determined in components being in contact
with mineral goods. Typical examples of use are found in the processing technology during
chopping up, classification, transport and storage of mineral goods as well as in contact of tools
with hard counterbodies like rock or concrete [1]. Characteristic for this kind of undesirable material
loss is a penetration of harder particles that, with movement relative to the surface, generate
grooving abrasion. Worn surfaces are characterized through indentation marks of mineral particles
and grooves which, in their geometry, are defined through the particle size, their form and through
the normal force in the tribological system.
description: International Conference on Stone and Concrete Machining (ICSCM), Vol 3 (2015)
title: Dagstuhl Reports, Table of Contents, Volume 2, Issue 10, 2012
Creators: name: Schloss Dagstuhl – Leibniz-Zentrum für Informatik
Publisher: name: Schloss Dagstuhl – Leibniz-Zentrum für Informatik
Year: 2013
Subjects: subject: Dagstuhl Reports
subject: Table of Contents
subject: Volume 2
subject: Issue 10
subject: 2012

description: Table of Contents, Frontmatter
description: Dagstuhl Reports, Volume 2, Issue 10, pages i-ii
Entanglement amplification between superposed detectors in flat and curved spacetimes
Creators: name: Foo, Joshua
name: Mann, Robert B.
name: Zych, Magdalena
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider an entanglement harvesting protocol between two Unruh-deWitt detectors in quantum superpositions of static trajectories in the static de Sitter and thermal Minkowski spacetimes. We demonstrate for the first time that the spatial superposition of each detector's path allows entanglement to be harvested from the quantum field in regimes where it would be otherwise impossible for detectors on classical trajectories. Surprisingly, for detectors on sufficiently delocalised trajectories in a thermal bath, the amount of harvested entanglement grows with the temperature of the field, violating a no-go theorem derived by Simidzija et. al. (Phys. Rev. D 98, 085007). We also discover interesting effects for mutual information harvesting, which depends sensitively on the nonlocal correlations between the superposed trajectories between the paths of the respective detectors.
description: 17 pages, 23 figures. Accepted in PRD
Quantum Bayesian methods and subsequent measurements
Creators: name: Neri, Filippo
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: After a derivation of the quantum Bayes theorem, and a discussion of the reconstruction of the unknown state of identical spin systems by repeated measurements, the main part of this paper treats the problem of determining the unknown phase difference of two coherent sources by photon measurements. While the approach of this paper is based on computing correlations of actual measurements (photon detections), it is possible to derive indirectly a probability distribution for the phase difference. In this approach, the quantum phase is not an observable, but a parameter of an unknown quantum state. Photon measurements determine a probability distribution for the phase difference. The approach used in this paper takes into account both photon statistics and the finite efficiency of the detectors.
description: Expanded and corrected version. 13 pages, 1 figure
Simple approaches on how to discover promising strategies for efficient enterprise performance, at time of crisis in the case of SMEs : Voronoi clustering and outlier effects perspective
Creators: name: Ausloos, Marcel
name: Bartolacci, Francesca
name: Castellano, Nicola G.
name: Cerqueti, Roy
Publisher: name: arXiv
Year: 2020
Subjects: subject: Statistical Finance (q-fin.ST)
subject: FOS: Economics and business

description: This paper analyzes the connection between innovation activities of companies -- implemented before a financial crisis -- and their performance -- measured after such a time of crisis. Pertinent data about companies listed in the STAR Market Segment of the Italian Stock Exchange is analyzed. Innovation is measured through the level of investments in total tangible and intangible fixed assets in 2006-2007, while performance is captured through growth -- expressed by variations of sales or of total assets, -- profitability -- through ROI or ROS evolution, - and productivity -- through asset turnover or sales/employee in the period 2008-2010. The variables of interest are analyzed and compared through statistical techniques and by adopting a cluster analysis. In particular, a Voronoi tessellation is implemented in a varying centroids framework. In accord with a large part of the literature, we find that the behavior of the performance of the companies is not univocal when they innovate. The statistical outliers are the best cases in order to suggest efficient strategies. In brief, it is found that a positive rate of investments is preferable.
description: 31 pages; 13 figures; 6 tables; 51 references ; ; in D. Grech and J. Miskiewicz (Eds.), Simplicity of Complexity in Economic and Social Systems, Springer Proceedings in Complexity (Springer, Cham, 2020) pp.1-20. arXiv admin note: substantial text overlap with arXiv:1808.05893
Cynodonichthys fuscolineatus
Creators: name: Angulo, Arturo
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Actinopterygii
Cyprinodontiformes
Rivulidae
Cynodonichthys
Cynodonichthys fuscolineatus

description: 7) Cynodonichthys fuscolineatus (Bussing, 1980);
Rivulidae.
Arenal Rivulus; Olomina, Alumina, Olomina Saltona, Killi, Saltón, Olomina del Arenal, Killi del Arenal (Fig. 4D).
New record for the Río Frío River basin; previous records of the species in Costa Rican freshwaters were restricted to the San Carlos and Bebedero River basins. New elevational record (731 m. a.s.l.); previous records of the species in Costa Rican freshwaters were restricted to 525– 695 m.a.s.l. Basis of the record: Two specimens were captured in an unnamed stream on the Bijagua-Zapote-El Higuerón road, Bijagua, Upala, Alajuela (10.76306, -85.06727), at 541 m. a.s.l., on May 1, 2021, by Jorge San Gil, Susana Gutiérrez, Pablo Morales, Derick Herrera and Arturo Angulo; additional specimens were captured on the Parque Nacional Volcán Tenorio (10.71147, -84.98826, at 674 m. a.s.l, and 10.70378, -84.99076, at 731 m. a.s.l; one and four, respectively) on the same date and by the same collectors (plus the park ranger Isaac López—SINAC) as above.
description: Published as part of Angulo, Arturo, 2021, New records and range extensions to the Costa Rican freshwater fish fauna, with an updated checklist, pp. 1-72 in Zootaxa 5083 (1) on page 13, DOI: 10.11646/zootaxa.5083.1.1, http://zenodo.org/record/5800630
Tool steels for hot stamping of high strength automotive body parts
Creators: name: Escher, Ch.
name: Wilzer, J.
Publisher: name: International Conference on Stone and Concrete Machining (ICSCM)
Year: 2015
Subjects: High strength steels; hot stamping; hard cutting; tool steels; cooling concepts

description: Hot stamping of high strength automotive body parts is a key technology to fulfill safety requirements
and CO2-emmision limit values which are made by the EU. In the last ten years, high effort was made
to improve the hot stamping process. Besides optimizing workflow and heating of the sheet metal
blanks, new tools steel grades were developed which show beneficial properties with respect to hot
stamping and hard cutting of high strength body parts. Furthermore, engineering of cooling systems
results in different cooling strategies which all shall improve the cooling efficiency of hot stamping
tools. In combination, these improvements lead to a reduction of cycle time and maintenance work
and therefore increases productivity of hot stamping processes. This paper gives a short summary
of the latest developments with respect to tool steels for hot stamping and hard cutting tools including
concepts for active cooled hot stamping tools.
description: International Conference on Stone and Concrete Machining (ICSCM), Vol 3 (2015)
Wear mechanisms of coated steels during press hardening
Creators: name: Windmann, M.
name: Röttger, A.
name: Theisen, W.
Publisher: name: International Conference on Stone and Concrete Machining (ICSCM)
Year: 2015
Subjects: Al-base coating; Intermetallic phases; Hardness; Wear; Press-hardening; Temperature

description: In this work microstructure of Al-base coated press-hardening steel 22MnB5, austenitized at
920°C, was analyzed with respect to the phase formation at the steel/coating interface. Thereby,
iron diffusion into the Al-base coating led to the formation of intermetallic AlxFey phases. The
intermetallic phases transformed to more Fe-rich phases with increasing dwell time. The coating
was characterized by a layered structure of phases Al5Fe2 and AlFe after a dwell time of tAus = 6
min (conventional press-hardening parameters). Cracks were formed in the coating due to the low
fracture toughness of the formed intermetallic phases mainly of type Al13Fe4, Al5Fe2 and AlFe.
Forming and quenching in the press-hardening tools took place at a temperature range of approx.
800°C to room temperature (RT). We found that the high hardness (520-1130 HV) and low fracture
toughness of the intermetallic phases led to strong wear of the press-hardening hot-work tool steel
X38CrMoV5-3. The hardness of the intermetallic phases decreased in the direction of a higher
temperature, leading to less abrasive wear at higher forming temperatures, thus wear by adhesion
is more pronounced. Phase AlFe was found to mainly induce adhesive wear, while phase Al5Fe2
led to strong abrasive wear due to the delamination of coating particles.
description: International Conference on Stone and Concrete Machining (ICSCM), Vol 3 (2015)
Lattice thermal conductivity of disordered binary alloys : a formulation
Creators: name: Alam, Aftab
name: Mookerjee, Abhijit
Publisher: name: arXiv
Year: 2005
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We present here a formulation for the calculation of the configuration averaged lattice thermal conductivity in random alloys. Our formulation is based on the augmented-space theorem, introduced by one of us, combined with a generalized diagrammatic technique. The diagrammatic approach simplifies the problem of including effects of disorder corrections to a great extent. The approach allows us to obtain an expression for the effective heat current in case of disordered alloys, which in turn is used in a Kubo-Greenwood type formula for the thermal conductivity. We show that disorder scattering renormalizes the phonon propagators as well as the heat currents. The corrections to the current terms have been shown to be related to the self-energy of the propagators. We also study the effect of vertex corrections in a simplified ladder diagram approximation. A mode dependent diffusivity $D_γ$ and then a total thermal diffusivity averaged over different modes are defined. Schemes for implementing the said formalism are discussed. A few initial numerical results on the frequency and temperature dependence of lattice thermal conductivity are presented for NiPd alloy and are also compared with experiment. We also display numerical results on the frequency dependence of thermal diffusivity averaged over modes.
description: 16 pages, 17 figures
A concept for deep cryogenic treatment of tool steels
Creators: name: Gavriljuk, V. G.
name: Theisen, W.
name: Tyshchenko, A. I.
name: Sirosh, V. A.
name: Kortmann, A.
Publisher: name: International Conference on Stone and Concrete Machining (ICSCM)
Year: 2015
Subjects: Tool steel; Heat treatment; Deep cryogenic treatment; Martensitic transformation; Plastic deformation; Tempering; Wear; Mechanical properties

description: A short review of experimental data about the effect of deep cryogenic treatment,
DCT, on the abrasive wear of tool steels is presented along with available hypotheses. Using
Mössbauer spectroscopy, X-ray diffraction, mechanical spectroscopy and transmission electron
microscopy, it is shown that the isothermal martensitic transformation proceeds in the course of
DCT. Moreover, the softness of the virgin isothermal martensite initiates the plastic deformation
during martensitic deformation, which results in the partial removal of carbon atoms from the solid
solution by the gliding dislocations. This effect eliminates the precipitation of the ε(η)-carbide
during subsequent tempering, shifts cementite precipitation towards higher temperatures and
delays precipitation of special carbides at temperatures of secondary hardness. Thus, the
precipitation potential of the γ solid solution is preserved and can be realized during the usage of
tools increasing thereby the tools life. Based on the obtained results, a new concept of DCT is
developed and the correction of its technology to the temperature range of the isothermal
martensitic transformation is proposed.
description: International Conference on Stone and Concrete Machining (ICSCM), Vol 3 (2015)
title: Dagstuhl Reports, Table of Contents, Volume 2, Issue 11, 2012
Creators: name: Schloss Dagstuhl – Leibniz-Zentrum für Informatik
Publisher: name: Schloss Dagstuhl – Leibniz-Zentrum für Informatik
Year: 2013
Subjects: subject: Dagstuhl Reports
subject: Table of Contents
subject: Volume 2
subject: Issue 11
subject: 2012

description: Table of Contents, Frontmatter
description: Dagstuhl Reports, Volume 2, Issue 11, pages i-ii
Abrasion in Tunneling and Mining
Creators: name: Röttger, A.
name: Küpferle, J.
name: Brust, S.
name: Mohr, A.
name: Theisen, W.
Publisher: name: International Conference on Stone and Concrete Machining (ICSCM)
Year: 2015
Subjects: Tunneling; Mining; hard face alloys; abrasive wear; metal matrix composites; hard phases

description: In future, tunneling and mining will play a major role due to the opening of new
resources and living environment, as an irreversible consequence of the growing world population.
To improve the efficiency of a tunneling or mining project, an increased durability of the used tools
and the knowledge about the remaining service life constituent a key instrument in this context. It is
the aim of this work to illustrate the different tribological systems which are present during a
tunneling or mining process, depending on the soil or rather the material to be mined. In addition,
different tool concepts, a description of the respectively tool-mineral interaction and common
material concepts will be described, basically.
description: International Conference on Stone and Concrete Machining (ICSCM), Vol 3 (2015)
Charged-particle multiplicity dependence of charm-baryon-to-meson ratio in high-energy proton-proton collisions
Creators: name: Chen, Yu
name: He, Min
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We propose that the charged-particle multiplicity dependence of the charm-baryon-to-meson ratio observed in high-energy $pp$ collisions can be explained by canonical treatment of quantum charges in the statistical hadronization model (SHM). Taking the full particle listings of PDG complemented by additional charm-baryon states from relativistic quark model predictions, we evaluate the canonical partition function and the charm-hadron chemical factors that measure the canonical suppression arising from the requirement of strict conservation of quantum charges. We demonstrate that, while charm number conservation induces common suppression on the production of both charm-baryons and -mesons, baryon (strangeness) number conservation causes further suppression on charm-baryons (charm-strange mesons) relative to nonstrange charm-mesons, thereby resulting in a decreasing $Λ_c/D^0$ ($D_s/D^0$) ratio toward smaller multiplicity events. The charm-hadron thermal densities thus computed are then used as pertinent weights to perform charm-quark fragmentation simulations yielding $p_T$-dependent $Λ_c/D^0$ and $D_s/D^0$ ratios at varying multiplicities in fair agreement with ALICE measurements.
description: 10 pages, 2 figures, 3 tables
Inductive-data-type Systems
Creators: name: Blanqui, Frédéric
name: Jouannaud, Jean-Pierre
name: Okada, Mitsuhiro
Publisher: name: arXiv
Year: 2006
Subjects: subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: In a previous work ("Abstract Data Type Systems", TCS 173(2), 1997), the last two authors presented a combined language made of a (strongly normalizing) algebraic rewrite system and a typed lambda-calculus enriched by pattern-matching definitions following a certain format, called the "General Schema", which generalizes the usual recursor definitions for natural numbers and similar "basic inductive types". This combined language was shown to be strongly normalizing. The purpose of this paper is to reformulate and extend the General Schema in order to make it easily extensible, to capture a more general class of inductive types, called "strictly positive", and to ease the strong normalization proof of the resulting system. This result provides a computation model for the combination of an algebraic specification language based on abstract data types and of a strongly typed functional language with strictly positive inductive types.
description: Theoretical Computer Science (2002)
Cyphocharax magdalenae
Creators: name: Angulo, Arturo
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Actinopterygii
Characiformes
Curimatidae
Cyphocharax
Cyphocharax magdalenae

description: 8) Cyphocharax magdalenae (Steindachner, 1878);
Curimatidae.
Carp Headstander; Sardina, Capani, Capaniz, Carpa, Plateada, Plateadita (Fig. 4E).
New elevational record (2 m. a.s.l.); previous records of the species in Costa Rican freshwaters were restricted to 12– 100 m.a.s.l. Basis of the record: Four specimens were captured in the Quebrada Honda, Pavones, Golfito, Puntarenas (8.42294, -83.10574), 2 m. a.s.l., on March 30, 2021, by Arturo Angulo, Jorge San Gil, Alejandro Oviedo and Juan Ignacio Abarca.
description: Published as part of Angulo, Arturo, 2021, New records and range extensions to the Costa Rican freshwater fish fauna, with an updated checklist, pp. 1-72 in Zootaxa 5083 (1) on page 15, DOI: 10.11646/zootaxa.5083.1.1, http://zenodo.org/record/5800630
Abrasivity of rock and soil
Creators: name: Küpferle, J.
name: Röttger, A.
name: Theisen, W.
name: Alber, M.
Publisher: name: International Conference on Stone and Concrete Machining (ICSCM)
Year: 2015
Subjects: Mechanized Tunneling; TBM; Abrasivity of hard rock and soil; LCPC; LAC; Cerchar; CAI; tool wear; wear-prediction

description: The abrasivity of rock and soil is a commonly determined property, which is used for the estimation
of the wear of excavation tools. Therefore, different laboratory test have been developed over the
last decades. Within this work, the often used LCPC- and Cerchar-test are presented. The
influence of the steel sample material on the determined abrasivity is analyzed in terms of the
tribological system, which describes the components and interactions influencing the wear of the
tunneling tools. The problems and inaccuracies in terms of the test methods are discussed and
described from the view of materials technology. To determine a sufficient wear-prediction model
for excavation tools, laboratory tests like LCPC and Cerchar are useful, but they have to be
considered in the tribological context. This means that it is necessary to map as much
characteristics as possible from the associated tribological system. The different system
components and their interactions have to be taken into account to determine a precise and
sufficient wear-prediction model. The mandatory influence of the steel sample material on the
results of the presented test methods and thus on the abrasivity of rock and soil has been pointed
out.
description: International Conference on Stone and Concrete Machining (ICSCM), Vol 3 (2015)
Vibrations of thick domain walls: How to avoid no-go theorem
Creators: name: Gani, Vakhid A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: The asymptotic properties of the stability potentials of kinks with power-law tails are discussed. In particular, in cosmology such kinks can describe "thick" domain walls. The discrete part of the domain wall excitation spectrum, the profile of which is described by a kink solution with one or both power-law asymptotics, cannot contain levels other than zero (translational) mode. Nevertheless, it can be shown that scenarios are quite possible when long-lived localized vibrations will be excited on the domain wall. This, in turn, can affect the processes of interaction of two or more domain walls.
description: 4 pages; Proceedings of the 5th International Conference on Particle Physics and Astrophysics (ICPPA-2020), Moscow, 5-9 October 2020
Search for possible way of producing super-heavy elements-Dynamic study on damped reactions of 244Pu+244Pu,238$U+238$U and 197Au+197Au
Creators: name: Wang, Ning
name: Li, Zhuxia
name: Wu, Xizhen
Publisher: name: arXiv
Year: 2005
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: By using the improved Quantum Molecular Dynamics model, the $^{244}$Pu+$^{244}$Pu, $^{238}$U+$^{238}$U and $^{197}$Au+$^{197}$Au reactions at the energy range of $E_{c.m.}$=800 $MeV$ to 2000 $MeV$ are studied. We find that the production probability of superheavy fragments(SHF) with $Z \geq$ 114 is much higher for $^{244}$Pu+$^{244}$Pu reaction compared with that of $^{238}$U+$^{238}$U reaction and no product of SHF is found for $^{197}$Au+$^{197}$Au. The production probability of SHF is narrowly peaked in incident energy dependence. The decay mechanism of the composite system of projectile and target and the time scale of decay process are explored. The binding energies of superheavy fragments are found to be broadly distributed and their shapes turn out to be exotic form.
description: 6 pages, 5 figures, 1 table
New wear-resistant materials for mining applications
Creators: name: Brust, S.
name: Röttger, A.
name: Theisen, W.
Publisher: name: International Conference on Stone and Concrete Machining (ICSCM)
Year: 2015
Subjects: Metal Matrix Composites; Wear-Resistance; Chemical Vapor Deposition; Surface Metallization; Diffusion Barrier Coating; Particle Coating

description: Economic and political driving forces are leading to an ambitious search for substitutes for fused
tungsten carbide (FTC) in ultra-high wear-resistant metal matrix composites (MMC), which are
used for mining applications. In the presented paper, possible substitutes such as alumina (Al2O3),
zirconia (ZrO2) and silicon carbide (SiC) are discussed. To enhance the wettability of oxides (e. g.
Al2O3, ZrO2) by Fe-base melts or to counteract strong dissolution of metastable covalent bonded
hard-particles (e.g. SiC) it is proposed to coat the particles with a thin titanium nitride (TiN) layer by
means of chemical vapor deposition (CVD). For this reason a CVD-apparatus for particle coating
was constructed and is shown in this paper. In addition, it is demonstrated that such a TiN coating
on the oxide particles can increase the wettability and therefore improve the embedding behavior
of the particles into a Fe-base matrix. In addition, it is shown that TiN coatings on covalent bonded
hard-particle SiC can be used as a diffusion barrier coating, thus counteracting a dissolution of the
hard-particles during processing by sintering techniques. However, due to the difference in linear
thermal expansion coefficients the coating tends to delaminate, partially.
description: International Conference on Stone and Concrete Machining (ICSCM), Vol 3 (2015)
Relativistic levels of mesic atoms
Creators: name: Giachetti, Riccardo
name: Sorace, Emanuele
Publisher: name: arXiv
Year: 2020
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We revisit the derivation of the covariant two-body scalar-fermion equation with a Coulomb interaction, presented in a previous paper. We show that it can be given the formal aspect of a Dirac equation, but for the fact that the eigenvalue is also contained in one of the coefficients and thus it is not linearly included. The discussion of the boundary value problem is therefore different, although some properties of the Dirac equation can be recovered in an approximation bringing back to the concept of reduced mass. We discuss a mixed analytic-numerical method of solution which allows to obtain very accurate results and we calculate the lowest levels, states and QED corrections for pionic and kaonic atoms.
description: 13 pages, 5 tables
Nanoscale Impurity Structures on the Surface of $d_{x^2-y^2}$-wave Superconductors
Creators: name: Stavropoulos, Nikolaos A.
name: Morr, Dirk K.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study the effects of nanoscale impurity structures on the local electronic structure of $d_{x^2-y^2}$-wave superconductors. We show that the interplay between the momentum dependence of the superconducting gap, the geometry of the nanostructure and its orientation gives rise to a series of interesting quantum effects. Among these are the emergence of a zero bias conductance peak in the superconductor's density of states and the suppression of impurity states for certain nanostructures. The latter effect can be used to screen impurity resonances in the superconducting state.
description: 4 pages, 5 figures
title: Dagstuhl Reports, Table of Contents, Volume 2, Issue 12, 2012
Creators: name: Schloss Dagstuhl – Leibniz-Zentrum für Informatik
Publisher: name: Schloss Dagstuhl – Leibniz-Zentrum für Informatik
Year: 2013
Subjects: subject: Dagstuhl Reports
subject: Table of Contents
subject: Volume 2
subject: Issue 12
subject: 2012

description: Table of Contents, Frontmatter
description: Dagstuhl Reports, Volume 2, Issue 12, pages i-ii
Titelei
Creators: name: Redaktion, Die
Publisher: name: Trierer Zeitschrift - Archäologie und Kunst des Trierer Landes und seiner Nachbargebiete
Year: 2024

description: Trierer Zeitschrift - Archäologie und Kunst des Trierer Landes und seiner Nachbargebiete, Bd. 53 (1990): Trierer Zeitschrift : für Geschichte und Kunst des Trierer Landes und seiner Nachbargebiete
Basic properties of toroidal structures in Kerr--de Sitter backgrounds
Creators: name: Stuchlik, Zdenek
name: Slany, Petr
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Perfect fluid tori with uniform distribution of the specific angular momentum orbiting the Kerr-de Sitter black holes or naked singularities are studied. Closed equipotential surfaces corresponding to stationary toroidal discs are allowed only in the spacetimes admitting stable circular geodesics. The last closed surface crosses itself in the cusp(s) enabling outflow(s) of matter from the torus due to the violation of hydrostatic equilibrium. The repulsive cosmological constant, $Λ>0$, implies the existence of the outer cusp (with a stabilizing effect on the tori because of "excretion", i.e., outflow of matter from the torus into the outer space) and the strong collimation of open equipotential surfaces along the rotational axis. Both the effects take place nearby the so-called static radius where the gravitational attraction is just balanced by the cosmic repulsion. The plus-family discs (which are always corotating in the black-hole backgrounds but can be counterrotating, even with negative energy of the fluid elements, in some naked singularity backgrounds) are thicker and more extended than the minus-family ones (which are always counterrotating in all backgrounds). If the parameters of naked-singularity spacetimes are very close to the parameters of extreme black-hole spacetimes, the family of possible disc-like configurations includes members with two isolated discs where the inner one is always a counterrotating accretion disc. Mass estimates for tori with nonrelativistic adiabatic equation of state give limits on their central mass-density, for which the approximation of test fluid is adequate.
description: Updated version of the Section talk at Albert Einstein Century International Conference at Palais de l'Unesco, Paris, France, 18-23 July, 2005; to appear in the Proceedings; AIP style files included; 8 pages
Cyprinus carpio Linnaeus 1758
Creators: name: Angulo, Arturo
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Actinopterygii
Cypriniformes
Cyprinidae
Cyprinus
Cyprinus carpio

description: 9) * Cyprinus carpio Linnaeus, 1758;
Cyprinidae.
Common Carp; Carpa Común, Carpa (Fig. 4F).
New record for the San Carlos, Sarapiquí, Tortuguero and Bebedero River basins; previous records of the species in Costa Rican freshwaters were restricted to the Tárcoles River basin. New elevational record (1 m. a.s.l.); previous records of the species in Costa Rican freshwaters were restricted to 112–1516 m.a.s.l. Basis of the record: One specimen was captured in the Laguna Jalova, Barra del Parismina, Pococí, Limón (10.34266, -83.39668), at 1 m. a.s.l., on August 24, 2021, by Jorge Leiva (Instituto Costarricense de Electricidad—ICE); additional specimens have been reported by artisanal anglers in natural pounds and small to large rivers on the San Carlos, Sarapiquí and Bebedero River basins.
description: Published as part of Angulo, Arturo, 2021, New records and range extensions to the Costa Rican freshwater fish fauna, with an updated checklist, pp. 1-72 in Zootaxa 5083 (1) on page 15, DOI: 10.11646/zootaxa.5083.1.1, http://zenodo.org/record/5800630
Fixed point subalgebras of lattice vertex operator algebras by an automorphism of order three
Creators: name: Tanabe, Kenichiro
name: Yamada, Hiromichi
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics
subject: 17B69

description: We study the fixed point subalgebra of a certain class of lattice vertex operator algebras by an automorphism of order 3, which is a lift of a fixed-point-free isometry of the underlying lattice. We classify the irreducible modules for the subalgebra. Moreover, the rationality and the $C_2$-cofiniteness of the subalgebra are established. Our result contains the case of the vertex operator algebra associated with the Leech lattice.
description: 77 pages
Impact of Animal Agriculture on Forest Ecosystem
Creators: name: Adedeji Mojirola Silifat
Publisher: name: Zenodo
Year: 2019

description: It is apparent that agricultural growth and development will continue as long as the population keeps on increasing. To the pursuit of this, an attempt is made in this paper to re-examine the issues revolving around the impacts of Agricultural production (Animal) on the forest ecosystem. Consequently, the paper advocate for small scale form size as a way out for combating the disequilibrium in the forest ecosystem. In addition, it recognized the need to formulate and implement a policy that will ensure safety, both in food production and forest ecosystem.
Multichannel effects in the Efimov regime from broad to narrow Feshbach resonances
Creators: name: Secker, T.
name: Ahmed-Braun, D. J. M.
name: Mestrom, P. M. A.
name: Kokkelmans, S. J. J. M. F.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We study Efimov physics of three identical bosons with pairwise multichannel interactions for Feshbach resonances of adjustable width. We find that the two-body multichannel nature of the interaction can affect the universal three-body spectrum, especially for resonances of intermediate width. The shifts in this universal spectrum are caused by trimer states in the closed interaction channels that couple to the universal Efimov states. However, in the narrow resonance limit we find that the Efimov spectrum is set by the resonance width parameter $r^*$ only independent of the interaction potential considered. In the broad resonance limit all excited Efimov trimer energies approach the ones from the corresponding single-channel system for the scenarios investigated.
On the large-angle anomalies of the microwave sky
Creators: name: Copi, C. J.
name: Huterer, D.
name: Schwarz, D. J.
name: Starkman, G. D.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: [Abridged] We apply the multipole vector framework to full-sky maps derived from the first year WMAP data. We significantly extend our earlier work showing that the two lowest cosmologically interesting multipoles, l=2 and 3, are not statistically isotropic. These results are compared to the findings obtained using related methods. In particular, the planes of the quadrupole and the octopole are unexpectedly aligned. Moreover, the combined quadrupole plus octopole is surprisingly aligned with the geometry and direction of motion of the solar system: the plane they define is perpendicular to the ecliptic plane and to the plane defined by the dipole direction, and the ecliptic plane carefully separates stronger from weaker extrema, running within a couple of degrees of the null-contour between a maximum and a minimum over more than 120deg of the sky. Even given the alignment of the quadrupole and octopole with each other, we find that their alignment with the ecliptic is unlikely at >98% C.L., and argue that it is in fact unlikely at >99.9% C.L. We explore the role of foregrounds showing that the known Galactic foregrounds are unlikely to lead to these correlations. Multipole vectors, like individual a_lm, are very sensitive to sky cuts, and we demonstrate that analyses using cut skies induce relatively large errors, thus weakening the observed correlations but preserving their consistency with the full-sky results. Finally we apply our tests to COBE cut-sky maps and briefly extend the analysis to higher multipoles. If the correlations we observe are indeed a signal of non-cosmic origin, then the lack of low-l power will very likely be exacerbated, with important consequences for our understanding of cosmology on large scales.
description: 26 pages, 7 figures. High resolution figures, multipole vector code and other information can be found at http://www.phys.cwru.edu/projects/mpvectors/
Studio del Particolato Atmosferico nelle Frazioni Fine  e Grossa del PM10 nelle Città  di Firenze,  Genova, Milano e Napoli nel Periodo 18 Gennaio - 16 Febbraio 2001
Creators: name: V. Ariola
name: L. Campajola
name: A. D'Alessandro
name: P. Del Carmine
name: F. Gagliardi
name: F. Lucarelli
name: P. A. Mandò
name: G.  Marcazzan
name: R. Moro
name: S. Nava
name: P. Prati
name: G. Valli
name: R. Vecchi
name: A. Zucchiatti
Publisher: name: INFN Open Access Repository
Year: 2002

description: The composition of particulate matter in the atmosphere has been studied in four major italian towns (Florence, Genoa, Milan and Naples) by means of  Ion Beam Analysis (IBA) techniques. The aerosol has been simultaneously collected in the four towns during the first weeks of 2001, by  two-stage continuous streaker samplers, which separate the particulate matter in two fractions (fine and coarse fraction of PM10). The  hourly concentrations in air of about 20 elements  have been deduced by  Particle Induced X-ray Emission, PIXE, analyses performed with the  external proton beam facility of the 3 MV accelerator of INFN, at the Physics Department of the University of Florence.RIASSUNTO- La composizione del particolato atmosferico in quattro grandi città italiane (Firenze, Genova, Milano e Napoli) è stata studiata con tecniche di Ion Beam Analysis (IBA). I campioni di particolato sono stati raccolti simultaneamente nelle quattro città durante le prime settimane del 2001 per mezzo di campionatori continui a due stadi (streaker samplers),che separano e raccolgono il particolato in due frazioni granulometriche (frazioni fine e grossa del PM10). L'andamento orario della concentrazione di una ventina di elementi è stato dedotto tramite misure PIXE (Particle Induced X-ray Emission), eseguite col setup di fascio esterno dell'acceleratore dell'INFN  presso il Dipartimento di Fisica dell'Università di Firenze.
Strategie per l'Update Management Process
Creators: name: Corso, Francesca Del
Publisher: name: INFN Open Access Repository
Year: 2006

description: L'articolo si propone di illustrare le metodologie per il sofware update ed il Security Patch Management su piattaforma Microsoft mostrando quali sono i processi, i tool e le utility per tenere aggiornati i propri sistemi minimizzando l'occorrenza e la gravità di possibili attacchi che sfruttino le vulnerabilità presenti sui sistemi. Il documento contiene inoltre una panoramica dei test effettuati presso la sezione INFN di Firenze e sull'attuale ambiente di produzione, proponendosi come linea guida e di consultazione per le altre sezioni INFN.
Supersymmetry in gauge theories with extra dimensions
Creators: name: Lim, C. S.
name: Nagasawa, Tomoaki
name: Sakamoto, Makoto
name: Sonoda, Hidenori
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We show that a quantum-mechanical N=2 supersymmetry is hidden in 4d mass spectrum of any gauge invariant theories with extra dimensions. The N=2 supercharges are explicitly constructed in terms of differential forms. The analysis can be extended to extra dimensions with boundaries, and for a single extra dimension we clarify a possible set of boundary conditions consistent with 5d gauge invariance, although some of the boundary conditions break 4d gauge symmetries.
description: 18 pages
A Closer Look at Two of the Most Luminous Quasars in the Universe
Creators: name: Schindler, Jan-Torge
name: Fan, Xiaohui
name: Novak, Mladen
name: Venemans, Bram
name: Walter, Fabian
name: Wang, Feige
name: Yang, Jinyi
name: Yue, Minghao
name: Banados, Eduardo
name: Huang, Yun-Hsin
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Ultra-luminous quasars ($M_{1450} \leq -29$) provide us with a rare view into the nature of the most massive and most rapidly accreting supermassive black holes (SMBHs). Following the discovery of two of these extreme sources, J0341${+}$1720 ($M_{1450}=-29.56$, $z=3.71$) and J2125${-}$1719 ($M_{1450}=-29.39$, $z=3.90$), in the Extremely Luminous Quasar Survey (ELQS) and its extension to the Pan-STARRS\,1 footprint (PS-ELQS), we herein present an analysis of their rest-frame UV to optical spectroscopy. Both quasars harbor very massive SMBHs with $M_{\rm{BH}}=6.73_{-0.83}^{+0.75}\times10^{9}\,M_{\odot}$ and $M_{\rm{BH}}=5.45_{-0.55}^{+0.60}\times10^{9}\,M_{\odot}$, respectively, showing evidence of accretion above the Eddington limit ($L_{\rm{bol}}/L_{\rm{Edd}}=2.74_{-0.27}^{+0.39}$ and $L_{\rm{bol}}/L_{\rm{Edd}}=3.01_{-0.30}^{+0.34}$). NOEMA 3 millimeter observations of J0341${+}$1720 reveal a highly star-forming ($\rm{SFR}\approx1500\,M_{\odot}\,\rm{yr}^{-1}$), ultra-luminous infrared galaxy ($L_{\rm{TIR}}\approx1.0\times10^{13}\,L_{\odot}$) host, which, based on an estimate of its dynamical mass, is only ${\sim}30$ times more massive than the SMBH it harbors at its center. As examples of luminous super-Eddington accretion, these two quasars provide support for theories, which explain the existence of billion solar mass SMBHs ${\sim}700$ million years after the Big Bang by moderate super-Eddington growth from standard SMBH seeds.
description: Accepted for publication in the Astrophysical Journal (ApJ)
Eucinostomus argenteus Baird & Girard 1855
Creators: name: Angulo, Arturo
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Actinopterygii
Perciformes
Gerreidae
Eucinostomus
Eucinostomus argenteus

description: 10) Eucinostomus argenteus Baird & Girard, 1855;
Gerreidae.
Silver Mojarra, Spotfin Mojarra; Mojarra Plateada, Sargo, Comearena, Palmito (Fig. 4G).
New record for the Tortuguero River basin; previous records of the species in Costa Rican freshwaters were restricted to the Martina River basin. Basis of the record: A single specimen was captured in the río Tortuguero, in the Parque Nacional Tortuguero, Limón (10.58527, -83.52335), at 1 m. a.s.l., on June 6, 1985, by Kirk Winemiller (UCR 1790-007).
description: Published as part of Angulo, Arturo, 2021, New records and range extensions to the Costa Rican freshwater fish fauna, with an updated checklist, pp. 1-72 in Zootaxa 5083 (1) on page 15, DOI: 10.11646/zootaxa.5083.1.1, http://zenodo.org/record/5800630
title: Dagstuhl Reports, Table of Contents, Volume 3, Issue 1, 2013
Creators: name: Schloss Dagstuhl – Leibniz-Zentrum für Informatik
Publisher: name: Schloss Dagstuhl – Leibniz-Zentrum für Informatik
Year: 2013
Subjects: subject: Dagstuhl Reports
subject: Table of Contents
subject: Volume 3
subject: Issue 1
subject: 2013

description: Table of Contents, Frontmatter
description: Dagstuhl Reports, Volume 3, Issue 1, pages i-ii
Qualificazione di Contenitori inn Titanio Effettuati In Camera Iperbarica
Creators: name: A. Ferrari
name: A. Grimaldi
name: A.Rottura
Publisher: name: INFN Open Access Repository
Year: 2007

description: In questo rapporto è descritto il test effettuato con camera iperbarica su 3 contenitori in titanio per qualificarne la loro tenuta ad una pressione esterna di lavoro di 350 bar equivalente a 3500 m di colonna d'acqua.