bluuebunny/crossref_metadata_2025 huggingface dataset:
A community detection method for network structure analysis of force chains in granular medium in a rotating drum
Authors: Navakas Robertas , Džiugys Algis
Published: December 2019

We analyze the motion of granular matter in a partially filled drum rotating around the horizontal axis. The
motion of granular medium is simulated using the discrete element model (DEM). As the drum rotates, the free surface sloping angle changes periodically as it attains the limit repose angle leading to an avalanche, after which its value is reduced to below the repose angle. Systems of this type are of interest from both theoretical and application
viewpoints: similar setups are used in industry, such as rotary kilns and mixers; besides, dynamics of granular matter
leads to macroscopic effects, such as segregation and emergence of patterns. Observable macroscopic effects depend
largely on the underlying structure of force chains arising from pairwise mechanical contacts between the particles.
Discrete element simulations produce the data for each individual particle: position, translational and rotational velocity, force vector between the interacting particle pairs. These data about the microscopic state must be processed to obtain the observable macroscopic states. Particle configurations at each time moment available from DEM simulations
can be represented as graphs: each particle is represented as a graph vertex, the vertex pairs are connected by edges if
the respective particle pairs are in contact, and the edge weights are proportional to the interaction force. After the
graph for a particle state is created, the algorithms of the graph analysis can be applied to analyze the corresponding
state of granular matter. Among such algorithms, we use the community detection algorithms to analyse the emergence of force groups among the particles, i.e., the groups of particles that have stronger mechanical forces among the
particles in the group than the forces with particles that do not belong to the given group. Such groups are structures of
larger scale than the usual force chains. Distribution of group sizes (number of particles belonging to the group) and
their positions depend on the rotation velocities of the drum; in turn, they influence the variation of the repose angle
and the process of the avalanches. We report the relations between the characteristics of the detected force groups and
the observable effects in the granular matter obtained by DEM simulations.
Experimental study of the behaviour of cement pastes in the presence of carbon nanotubes
Authors: Šukys Ritoltas , Pranckevičienė Jolanta , Girskas Giedrius , Pundienė Ina , Leonavičius Dainius , Kligys Modestas
Published: December 2019

One of the methods recently applied for the noticeably improvement of properties of cementitious materials
is the use of the single or multi-walled carbon nanotubes (CNTs) as nano-reinforcements in cementitious materials. The
positive action of CNTs highly depends not only on its nature, length and amount, but also on previous treatment of
CNTs and quality of CNTs dispersion. It is important to obtain the effects of multi-walled CNTs, dispersed only in
carboxyl-methyl cellulose – commercially available pellets without the use of any commercially available surfactants
or plasticizers. The influence of dispersed CNTs on the rheological properties of fresh cement pastes and physical and
mechanical properties of hardened specimens was analyzed in this work. Compared to the dynamic viscosity of pure
distilled water smaller amounts of CNTs (0.00005–0.005%) reduce the dynamic viscosity down to the 15% whereas
higher amounts of CNTs (0.05–0.5%) increase the dynamic viscosity from 1.3 to 4.7 times. Mechanical tests of hardened
for 28 days cement paste specimens showed that smaller amounts of CNTs (0.00005–0.005%) increase the compressive
and flexural strengths by 38.07– 42.3% and 40.1– 44.6%, whereas higher amounts of CNTs (0.05–0.5%) increase these
strengths just by 21.11–18.82% and 18.33–6.6% respectively.
Quantitative assessment of aggregate segregation of hardened self compacted concrete based on 2D image analysis
Authors: Wawrzeńczyk Jerzy , Molendowska Agnieszka , Kłak Adam
Published: December 2019

Self-compacting concrete developed as a material that does not need vibration for compaction has been increasingly being used in routine practice. Successful application of self-compacting concrete (SCC) is difficult to
achieve due to increased flowability of the concrete mixture. Segregation of aggregate is one of the major problems
during construction and ultimately influences the strength and durability of SCC. A fresh self-compacting concrete
with poor segregation resistance can lead to a nonuniform distribution of coarse aggregates in the concrete volume,
contributing to blockage of concrete flow, and nonuniform mechanical properties and durability at the hardened concrete. The article presents the unique method for quantitative assessment of aggregate segregation in hardened
self-compacted concrete. A digital image analysis procedure using original lighting microscope equipment has been
placed to investigate the concrete segregation behavior. The photographs of concrete specimen surfaces were taken to
calculate measurements of aggregate volume in concrete. The research results showed that the originally developed
attachment and unique aggregate segregation assessment method are useful in laboratory tests and could be used in the
on-site application.
The influence of milling technology on the crystallite size and granulometry of tricalcium aluminate
Authors: Ravaszová Simona , Dvořák Karel
Published: December 2019

The article deals with the monitoring and evaluating of the length of the milling process on the crystallographic and granulometric properties of the cubic tricalcium aluminate. Tricalcium aluminate was prepared by solidstate reaction and subjected to milling in a dry and wet conditions of three laboratory mills. The evaluation of the
influence of the milling technology on the crystallite size was carried out on the selected main three crystallographic
planes. The calculation of the crystallite size was based on the full width of half maximum. Full width of half maximum
has been calculated for all the above diffraction lines in the HighScore Plus program. All types of selected laboratory
mills in both dry and wet conditions for all three crystallographic planes affect crystallite size of tricalcium aluminate.
In terms of granulometry, the material was very effective and significantly refined. The problem arises with long grinding time, where the material tended to form agglomerates.
Influence of partial replacement of sand with copper slag on the thermal properties of hardened concrete
Authors: Majewski Łukasz , Jaskulski Roman , Kubissa Wojciech
Published: December 2019

The article presents the results of testing the effect of partial replacement of sand with fine copper slag waste on the thermal properties of hardened concrete. The impact of the replacement on mechanical properties (ie. compressive and tensile strength of concrete) was also investigated. The thermal properties of the concrete were determined using the non-stationary method with the ISOMET 2114 device. Tests were performed on concrete containing three different types of cement (CEM I, CEM II and CEM III). A total cement content of 360 kg/m3 was assumed in the compositions of all concrete mixes with a water-cement ratio of 0.45. Replacing 66% of the sand volume with copper slag waste caused a decrease in thermal conductivity by about 4–8% in relation to the reference concrete. In addition, the compressive strength of concrete containing copper slag increased by about from 4–21% in relation to the reference concrete.
Creation of mathematical model optimization of Freeform Double-Layer Grids for use in the software package
Authors: Alpatov Vadim
Published: December 2019

It is known that metal spatial coatings can be made in shape of spatial structures, folded dual-slope structures,
double mesh grid shells, double-layer braced barrel vaults, double-layer braced domes, free-form spatial structures, etc.
In this paper we consider constructions on a rectangular base. The shape of the structure and distribution of material
inside it are defined by solving the parametric optimization task. In the task, it has been assumed that the geometric
shape of the structure can take the shape of a free-form spatial structures. A mathematical model of parametric optimization task has been presented. The task may be formulated as the discrete optimization task. The quality criterion is the
minimum mass of the structure. The objective function is written through the task parameters. The analysis of permissible geometric forms of structures was made. Based on this analysis, the functions of restrictions are recorded through
the parameters of the task. The restrictions are compressed by including them into objective function. As a result, a
mathematical description of the objective function for the task of parametric optimization in an unconditional formulation was proposed.
Evaluation of investing in real estate in EU and non-EU countries based on MCDM
Authors: Erdogan Seyit Ali , Naumčik Andrej
Published: December 2019

Investment in real estate is a zoning issue as the real estate market is closely related to economic development and trends in real estate market are considered to be indicators of trends in the whole economy of the country.
The goal of this paper is to analyse the main aspects and considerations when investing in real estate, evaluate investment in real estate situation in different EU and non-EU countries and introduce MCDM methods that could be used
for selecting a state for investment in real estate. It is identified that when investing in real estate various political, social, economic, environmental and other factors
have to be taken into consideration. Analysed examples of EU (Lithuania, Romania, UK) and non-EU (Turkey, China, Russia) countries show different
risks and opportunities for investments in real estate. MCDM methods are applicable to evaluate which countries are most attractive for investment in real estate. Described
TOPSIS and ARAS methods could be used for assessing states as alternatives when selecting where to invest
The Two-sided Jet Structures of NGC 1052 at Scales from 300 to 4 × 107 Schwarzschild Radii
Authors: Nakahara Satomi , Doi Akihiro , Murata Yasuhiro , Nakamura Masanori , Hada Kazuhiro , Asada Keiichi , Sawada-Satoh Satoko , Kameno Seiji
Published: December 2019

We investigated the jet width profile with distance along the jet in the nearby radio galaxy NGC 1052 at radial distances between ∼300 and 4 × 107 Schwarzschild radii (R
S) from the central engine on both their approaching and receding jet sides. The width of jets was measured in images obtained with the Very Long Baseline Interferometry (VLBI) Space Observatory Programme, the Very Long Baseline Array, and the Very Large Array. The jet width profiles of receding jets are apparently consistent with those of approaching jets throughout the measuring distance ranges, indicating symmetry at least up to the sphere of gravitational influence of the central black hole. The power-law index a of the jet width profile (w
jet ∝ r

a
, where w
jet is the jet width, r is the distance from the central engine in the unit of R
S) apparently shows a transition from a ∼ 0 to a ∼ 1, i.e., the cylindrical-to-conical jet structures, at a distance of ∼1 × 104
R
S. The cylindrical jet shape at small distances is reminiscent of the innermost jets in 3C 84. Both the central engines of NGC 1052 and 3C 84 are surrounded by dense material, part of which is ionized and causes heavy free–free absorption.
Binary Stars in Upper Scorpius
Authors: Tokovinin Andrei , Briceño Cesar
Published: December 2019

To address the statistics of binary stars in the 8 Myr old Upper Scorpius (USco) star formation region, we conducted a speckle interferometric survey of 614 association members more massive than 0.4

 (spectral types earlier than M3V) based on the list of Luhman et al. (2018). We resolved 187 pairs, 55 of which are new discoveries. Also using the published data and the Gaia DR2, a catalog of 250 physical binaries was produced. We carefully estimated detection limits for each target and studied binary statistics in the separation range from 0.″06 to 20″ (9–2800 au), as well as clustering at larger separations. The frequency of companions with mass ratios q > 0.3 in this separation range is 0.33 ± 0.04 and 0.35 ± 0.04 for early M- and solar-type stars, respectively, larger by 1.62 ± 0.22 and 1.39 ± 0.18 times compared to field stars of similar masses. The excess is produced mostly by pairs closer than 100 au. At separations from 100 to 104 au, the separation distribution and companion fraction resemble those of solar-type stars in the field. However, unlike in the field, we see a relative deficit of equal-mass binaries at separations of ∼500 au, compared to smaller and larger separations. The distribution of q depends on the separation, with a preference of larger q and a larger fraction of twins with q > 0.95 at smaller separations. The binary population of USco differs from binaries in the field in several ways and suggests that binary statistics is not universal.
An Information Theory Approach on Deciding Spectroscopic Follow-ups
Authors: Astudillo Javiera , Protopapas Pavlos , Pichara Karim , Huijse Pablo
Published: December 2019

Classification and characterization of variable phenomena and transient phenomena are critical for astrophysics and cosmology. These objects are commonly studied using photometric time series or spectroscopic data. Given that many ongoing and future surveys are conducted in a time domain, and given that adding spectra provides further insights but requires more observational resources, it would be valuable to know which objects we should prioritize to have a spectrum in addition to a time series. We propose a methodology in a probabilistic setting that determines a priori which objects are worth taking a spectrum of to obtain better insights, where we focus on the insight of the type of the object (classification). Objects for which we query their spectrum are reclassified using their full spectral information. We first train two classifiers, one that uses photometric data and another that uses photometric and spectroscopic data together. Then for each photometric object we estimate the probability of each possible spectrum outcome. We combine these models in various probabilistic frameworks (strategies), which are used to guide the selection of follow-up observations. The best strategy depends on the intended use, whether it is obtaining more confidence or accuracy. For a given number of candidate objects (127, equal to 5% of the data set) for taking spectra, we improve the class prediction accuracy by 37% as opposed to 20% of a non-naive (non-random) best-baseline strategy. Our approach provides a general framework for follow-up strategies and can be extended beyond classification to include other forms of follow-ups beyond spectroscopy.
Physical Properties of the Star-forming Regions in the Interacting Galaxies NGC 3395/NGC 3396
Authors: Weistrop D. , Nelson C. H. , Angione R. , Bachilla R.
Published: December 2019

We report long-slit spectroscopy of the early major merger galaxies NGC 3395/NGC 3396. The spectra are consistent with those for star-forming galaxies, but there is some indication of LINER-like active galactic nucleus activity in the center of NGC 3396. The total star formation rate in the regions observed is 2.83 M
⊙ yr−1, consistent with estimates for the entire galaxies. The highest abundances are in the centers of the galaxies, with the abundances decreasing with distance. There is a correlation between high abundance and high ionization parameter, both of which can be attributed to the presence of massive stars. Modeling with SB 99 indicates the star-forming regions are younger than 10 Myr. There are 1000–2000 WNL stars in the system, along with several thousand O stars, consistent with the ages of the star-forming regions. The highest electron densities are found in young regions with high star formation rates. The electron temperatures are higher than results for non-interacting galaxies, which is probably due to shock waves produced by the galaxy–galaxy interaction, the outflow of gas from massive stars, and/or collisions between gas clouds in the galaxies. There is star formation in the bridge of material between the galaxies. These regions are among the youngest in the system and have low abundances, suggesting the gas was pulled from the outer parts of the galaxies. X-ray point sources, probably high-mass X-ray binaries, are associated with several star-forming regions.
Energy Origination and Triggering Mechanism of a Series of Homologous Confined Flares
Authors: Chen Guorong , Yan Xiaoli
Published: December 2019

Using the Hα data from the New Vacuum Solar Telescope at the Fuxian Solar Observatory together with multiwavelength images and magnetograms obtained by the Solar Dynamics Observatory, we study the detailed process of three homologous confined flares in active region NOAA 11861 on 2013 October 12. All of the three flares occurred at the same location, with similar morphologies and comparable classes. Through analyzing the evolution of magnetic field and flow field, we found an emergence of magnetic flux and a strong shearing motion between two opposite polarities near the following sunspot. The magnetic flux and the average transverse field strength exhibited a decrease before each eruption and reached the lowest point at the onset of each eruption. By calculating the shearing and the emergence energy in the photosphere, we found that the integral of energy injected from the photosphere, for a few hours, could provide enough energy for the flares. The reconnection between different loops was observed in Hα images during the occurrence of each flare. These results suggest that the emerging magnetic flux and the shearing motion in the photosphere can inject the energy to the sheared magnetic loops and the energy was finally released via magnetic reconnection to power the solar flares.
Multivariate Analysis of BATSE Gamma-Ray Burst Properties Using Skewed Distributions
Authors: Tarnopolski Mariusz
Published: December 2019

The number of classes of gamma-ray bursts (GRBs), besides the well-established short and long ones, remains a debatable issue. It was already shown, however, that when invoking skewed distributions, the

and

spaces are adequately modeled with mixtures of only two such components, implying two GRB types. Herein, a comprehensive multivariate analysis of several multidimensional parameter spaces is conducted for the BATSE sample of GRBs, with the usage of skewed distributions. It is found that the number of extracted components varies between the examined parameter sets, and ranges from 2 to 4, with higher-dimensional spaces allowing for more classes. Monte Carlo testing implies that these additional components are likely to be artifacts owing to the finiteness of the data and to be a result of examining a particular realization of the data as a random sample, resulting in spurious identifications.
Partial Invariants, Large-scale Dynamo Action, and the Inverse Transfer of Magnetic Helicity
Authors: Rathmann Nicholas M. , Ditlevsen Peter D.
Published: December 2019

The existence of partially conserved enstrophy-like quantities is conjectured to cause inverse energy transfers to develop embedded in magnetohydrodynamical (MHD) turbulence, in analogy to the influence of enstrophy in two-dimensional nonconducting turbulence. By decomposing the velocity and magnetic fields in spectral space onto helical modes, we identify subsets of three-wave (triad) interactions conserving two new enstrophy-like quantities that can be mapped to triad interactions recently identified with facilitating large-scale α-type dynamo action and the inverse transfer of magnetic helicity. Due to their dependence on interaction scale locality, invariants suggest that the inverse transfer of magnetic helicity might be facilitated by both local- and nonlocal-scale interactions, and is a process more local than the α-dynamo. We test the predicted embedded (partial) energy fluxes by constructing a shell model (reduced wave-space model) of the minimal set of triad interactions (MTI) required to conserve the ideal MHD invariants. Numerically simulated MTIs demonstrate that, for a range of forcing configurations, the partial invariants are, with some exceptions, indeed useful for understanding the embedded contributions to the total spectral energy flux. Furthermore, we demonstrate that strictly inverse energy transfers may develop if enstrophy-like conserving interactions are favored, a mechanism recently attributed to the energy cascade reversals found in nonconducting three-dimensional turbulence subject to strong rotation or confinement. The presented results have implications for the understanding of the physical mechanisms behind large-scale dynamo action and the inverse transfer of magnetic helicity, processes thought to be central to large-scale magnetic structure formation.
Hypnose et addictions
Authors: Roberts Dina
Published: December 2019

Les patients bénéficiant de séances d’hypnose dans la prise en charge de leur addiction en rapportent de nombreux bénéfices. Cette expérience sensorielle et émotionnelle, co-créée avec le thérapeute, est vécue comme un moment agréable, de partage, avec un impact positif sur la relation thérapeutique. Les patients rapportent une amélioration de leur qualité de vie avec une sensation de bien-être, une amélioration thymique, un meilleur sommeil et une réduction de leur anxiété. Ils décrivent également l’impact de l’hypnose sur leur pratique addictive : certains parviennent à réorienter leur attention pendant les cravings, à changer leur rapport au produit, et plusieurs vont jusqu’à remplacer l’effet d’un produit par une séance d’autohypnose.
Le travail sur les enveloppes psychocorporelles en psychomotricité chez le sujet addict
Authors: Reynaud Marie-Alix
Published: December 2019

Chez le sujet addict, la mise en place des enveloppes psychocorporelles est altérée. L’importance des interactions précoces et l’influence des défaillances de l’environnement sont essentielles dans cette problématique. Nous verrons dans cet article comment une prise en charge en psychomotricité peut permettre aux patients addicts de réinvestir leur corps et de restaurer les enveloppes psychocorporelles fragilisées afin de les conduire vers un mieux-être et un mieux vivre en soi.
Un classique de l’addictologie : la 83 e lettre à Lucilius de Sénèque
Authors: Valleur Marc
Published: December 2019

La 83 e  lettre à Lucilius de Sénèque (1 av. J.-C.-65 ap. J.-C.) est considérée comme un classique de l’addictologie, notamment parce que le philosophe y pointe clairement la différence entre d’une part l’ivresse aiguë et ses conséquences, et d’autre part le fait d’être un ivrogne, un buveur invétéré. La lecture de ce texte permet de mettre en évidence les parallèles (souvent frappants) et les différences (très nettes) entre les discours de la philosophie antique et nos conceptions actuelles sur l’addiction : les discours stoïciens sur les dangers des passions préfigurent nos discours préventifs, mais les considérations sur l’habitude, seconde nature, n’annoncent guère la perception de la dépendance comme maladie.
The Reciprocal Relationship of Pain and Movement in African American Older Adults With Multi-Joint Osteoarthritis
Authors: Booker Staja Q. , Herr Keela , Fillingim Roger B.
Published: December 2019

Pain with movement is a common issue for older adults with osteoarthritis; however, there has been insufficient attention within populations at increased risk for disabling pain, such as African American older adults. Accordingly, using a mixed methods approach, the purpose of the current study is to describe the nature of chronic joint pain and movement and its impact on physical function in African American older adults with symptomatic osteoarthritis. The authors accrued a sample of 110 African American older adults who completed cross-sectional surveys; from this sample, the authors interviewed 18 participants. Findings suggest that patterns of movement are uniquely influenced by pain. Specifically, three dynamic themes emerged:
The Impact of Pain on Movement; The Importance and Impact of Movement on Pain;
and
The Adaptation of Personal Behaviors to Minimize Pain With Movement.
Function-focused nursing care rests on addressing challenges and opportunities that African American older adults face in maintaining healthy movement when managing osteoarthritis pain. [
Research in Gerontological Nursing, 13
(4), 180–190.]
El liderazgo militar en la Castilla del siglo XV
Authors: Etxeberria Gallastegi Ekaitz
Published: December 2019

El objetivo de este artículo es analizar un aspecto descuidado por la historiografía española, el liderazgo militar en la Castilla del siglo XV en el contexto europeo. La documentación administrativa no resulta útil, manejaré como alternativa las fuentes narrativas, con especial atención a las crónicas regias y particulares. Organizaré la información en tres bloques temáticos relacionados con aspectos culturales, sociales y puramente militares: la formación militar, el acceso a los puestos de mando y su ejercicio. El examen demuestra que, a pesar de que para las capitanías de frontera se tenía en cuenta la veteranía y la pericia, los mecanismos de acceso al liderazgo estaban profundamente condicionados por la estructura social, quedando los más relevantes reservados a la alta nobleza. Las posibles disfunciones derivadas de un sistema militar que extrae a sus líderes del escalafón más alto se intentan paliar mediante una formación teórico-práctica que se emprende desde la niñez y que busca preparar a la nobleza para la tarea de ejercer el caudillaje militar. Con todo, la ausencia de una estructura de mando estable tenía un impacto directo en su ejercicio, provocando que los líderes con experiencia se vieran reducidos a persuadir e inspirar.
Las campañas de Marruecos y la opinión pública. Una puesta al día
Authors: Gajate Bajo María
Published: December 2019

En este trabajo se pretende ofrecer una visión panorámica y crítica del progreso académico logrado en el análisis de la repercusión pública de las campañas hispano-marroquíes. Se aspira, además, a que estas páginas sirvan de base para investigaciones futuras y que permitan anticipar algunas novedosas líneas de estudio. A propósito de la tan compleja implantación del Protectorado hispano-francés en Marruecos (1912) y de las traumáticas campañas bélicas que lo acompañaron, se conocía con bastante rigor la opinión del sector militar, sobre todo a raíz de las célebres derrotas ocurridas en el Barranco del Lobo (1909) y en Annual (1921). En las últimas décadas, no obstante, se va avanzando en la comprensión del posicionamiento civil ante los mismos sucesos. Con una perspectiva más amplia, por último, se confirma que el estudio de la opinión pública —de su gestación, sus cambios y divisiones— constituye un terreno de análisis historiográfico cada vez mejor abonado, más fecundo, con enfoques y metodologías de lo más variopintas.
La narrativa geopolítica imperial de las dictaduras ibéricas: el régimen de Franco y la desaparición del Estado portugués de la India en 1961
Authors: Jiménez Redondo Juan Carlos
Published: December 2019

Las narrativas imperiales del franquismo y del salazarismo fueron muy coincidentes hasta los años sesenta. Tras esa fecha, la España de Franco asumió un nuevo discurso más abierto a la lógica del proceso de descolonización, a fin de evitar que su situación internacional se viera comprometida. Esta flexibilidad fue vista de forma negativa en Lisboa, aunque sin que ello supusiera cuestionar la fuerte relación que ambas dictaduras ibéricas mantenían, ya que tanto Franco como Salazar siempre consideraron que sus relaciones debían de ser prioritarias. En este artículo se analizan esas narrativas imperiales y como operaron en el caso concreto de la invasión india de Goa. La dura reacción de España a la política de Nehru reafirma la idea de que Franco siempre consideró que Portugal sufría un ataque internacional inmerecido, y que España debía alinearse con toda claridad al lado del otro país ibérico.
Análisis bibliométrico de la revista Trabajos de Prehistoria en el contexto de las revistas españolas de Arqueología y Prehistoria recogidas por Scopus e ÍnDICEs CSIC
Authors: Rodríguez Yunta Luis , Vidal Liy José Ignacio , Martínez Navarrete M.ª Isabel
Published: December 2019

La publicación en 2018 del volumen 75 de la revista Trabajos de Prehistoria motiva este análisis completo de la misma (1960-2018). El artículo parte de su presencia en bases de datos documentales y se plantea como una aportación al debate sobre la evaluación de las revistas científicas. El estudio bibliométrico aborda la evolución temática, la distribución de la autoría y el impacto a través de citas, a partir de los datos que pueden extraerse de ÍnDICEs- CSIC y Scopus. Para situar la revista en el contexto de las publicaciones españolas de Arqueología y Prehistoria, se compara con otras 9 revistas de Arqueología de la península ibérica presentes en Scopus y editadas entre 2010 y 2018 por instituciones públicas: Archivo de Prehistoria Levantina, Archivo Español de Arqueología, Complutum, Lucentum, Munibe Antropologia-Arkeologia, Pyrenae, Saguntum, SPAL y Zephyrus. La clasificación por periodos de los artículos aparecidos en esos 9 años define con claridad la orientación temática de cada revista. Su comparación permite una caracterización general de las pautas de difusión científica de los arqueólogos orientados hacia la Prehistoria y/o hacia la Historia antigua en la última década. En consecuencia, el artículo es también una aportación a la historia de la ciencia.
Sorprendente, colorido, suave, raro: recursos líticos y preferencias culturales en la arquitectura, escultura y artefactos portables del monumento tipo tholos de Palacio III (Sevilla, España)
Authors: García Sanjuán Leonardo , Afonso Marrero José Andrés , Bueno Ramírez Primitiva , De Balbín Behrmann Rodrigo , Lozano Rodríguez José Antonio , Martínez Fernández Gabriel , Wheatley David W. , Cintas Peña Marta
Published: December 2019

Solo recientemente la investigación del fenómeno megalítico ibérico ha comenzado a beneficiarse de la ampliación del potencial técnico y científico de la arqueología moderna. Todavía son muy pocos los megalitos ibéricos para los que se han realizado investigaciones científicas de alta resolución, capaces de aportar datos detallados sobre su diseño, usos y biografías.En este trabajo se presentan los resultados del estudio del tholos del complejo megalítico de Palacio III (Almadén de la Plata, Sevilla), abordado mediante una metodología multidisciplinar que integra la geoarqueología, el estudio tecnomorfológico y funcional de la cultura material portable y el análisis gráfico, dentro de una meticulosa valoración contextual.Los resultados aportan datos muy novedosos respecto a cómo, a través de una serie de elecciones culturales cuidadosamente construidas, este monumento representa un verdadero lugar de encuentro entre los recursos geológicos localmente disponibles y los recursos accesibles mediante contacto con otras comunidades.Bien en su forma bruta, bien labrada en forma de esculturas grabadas y pintadas o transformada en artefactos de alto valor técnico y personal, la materialidad de la piedra adquiere en Palacio III múltiples dimensiones culturales que solo a través de la moderna investigación científica es posible reconstruir.
Plata semirrefinada para los plateros de la Edad del Hierro en el Mediterráneo: un mecanismo para identificar la plata ibérica
Authors: Wood Jonathan R. , Montero-Ruiz Ignacio
Published: December 2019

Un fragmento de lingote de plata descubierto recientemente en el yacimiento fenicio de La Rebanadilla (Málaga) ha sido investigado mediante isotopos de plomo y análisis elemental.El lingote recuperado en los niveles inferiores del yacimiento, se fecha potencialmente entre fines del siglo XI y el IX a.C., situándose en cronología similar a algunos depósitos de hacksilver del área del levante mediterráneo.La edad de la corteza calculada a partir de los isotopos de plomo y la composición señalan que el lingote fue obtenido de minerales de Edad Hercínica con concentraciones altas de bismuto.Esta signatura es compatible con la de la Faja Pirítica del suroeste de la península ibérica, en particular con la de las antiguas minas de la zona de Riotinto.Se propone que la plata de este lingote fue obtenida de las jarositas argentíferas de Riotinto, donde sufrió solo un primer refinado mediante copelación, conservando un alto contenido en plomo antes de ser comercializado hacia La Rebanadilla, que pudo ser un lugar potencial para su transporte hacia los territorios fenicios en el Mediterráneo oriental. Las implicaciones del transporte de plata sin refinar son discutidas en relación al comercio de la plata por los fenicios durante la Edad del Hierro en el Mediterráneo y la dificultad de identificar la plata ibérica en el registro arqueológico.
Conociendo las foicinhas líticas del poblado prehistórico de Leceia (Oeiras, Portugal)
Authors: Cardoso João Luís , Gibaja Juan F.
Published: December 2019

Uno de los elementos más representativos del Neolítico Final-Calcolítico en buen parte del oeste de la Península Ibérica son las piezas bifaciales elaboradas en sílex. En el territorio portugués, estas piezas, llamadas tradicionalmente foicinhas, son ahora conocidas como “láminas foliáceas”. Muchos yacimientos de este periodo son poblados fortificados, siendo el de Leceia uno de los ejemplos más conocidos. Este trabajo se centra en dichas piezas que carecen de un análisis profundo. Ello es sorprendente pues son muchos los instrumentos líticos, en general, y las láminas foliáceas, en particular, documentadas en los yacimientos de esta cronología. A lo largo del texto abordamos la información relativa a la materia prima, la tecnología, la morfología y la función de estos útiles. Ello nos ha permitido evaluar las zonas de aprovisionamiento de la población de Leceia, las posibles relaciones sociales que había establecido con otros grupos a partir del origen de ciertos tipos de sílex, su capacidad tecnológica y la función a la que se destinaron algunas de esas láminas.
Cogito et histoire du sujet : quelques remarques sur la biopolitique et la psychanalyse
Authors: Balzaretti Ugo
Published: December 2019

La conférence que Georges Canguilhem donna au Collège philosophique de Jean Wahl en 1956, « Qu’est-ce que la psychologie ? », fut saluée par Jacques Lacan comme une défense de la psychanalyse contre les prétentions hégémoniques de la psychologie. La psychanalyse, dont la naissance est malgré tout comprise dans la généalogie esquissée par Canguilhem, est-elle toutefois vraiment à l’abri des critiques que celui-ci adresse à la psychologie ? Cette contribution analyse le rapport de la psychanalyse à l’instrumentalisme foncier de la psychologie sous trois aspects : la relation entre science et vérité, la réduction par Gassendi et la tradition aristotélique du niveau originaire et spéculatif du cogito cartésien à celui spéculaire de la connaissance physique de l’âme par soi-même, et le choix freudien et lacanien d’un être-pour-la-mort contre toute philosophie de la vie. À la lumière du scientisme de la psychanalyse et de son rapport constitutif au mythe et au sacré, que Lacan pas plus que Freud n’arrive à dépasser, un lien est enfin établi avec, d’une part, l’archéologie de la psychanalyse développée dans Naissance de la clinique et La volonté de savoir et, de l’autre, le privilège que Foucault accorde à la psychanalyse et à l’ethnologie parmi les sciences humaines dans Les mots et les choses.
La psychanalyse et la société de normalisation : Lacan versus Foucault
Authors: Pfauwadel Aurélie
Published: December 2019

Foucault a noué ensemble, dans les années 1970, sa généalogie de la société de normalisation et ses généalogies, multiples, de la psychanalyse. Mais reste souvent méconnu le fait que Lacan lui-même a mis en rapport l’émergence de la psychanalyse avec l’extension croissante de la société de normalisation, comme une réaction à celle-ci, un peu avant la parution de La volonté de savoir (1976). La position de Lacan s’avère diamétralement opposée à celle de Foucault en ce qu’il considère la psychanalyse comme une pratique radicalement hors normes, et non comme un agent de normalisation. La question cruciale dont traite cet article est celle de la pertinence des généalogies foucaldiennes d’une part, et celle qui consiste à lui opposer une histoire de la psychanalyse crédible qui rendrait compte de sa spécificité et de son pouvoir de subversion d’autre part. Les outils d’une histoire de la psychanalyse fournis par Lacan présentent à divers titres un intérêt à ce sujet. Lacan élabore cette histoire depuis le champ de la psychanalyse et conformément à l’épistémologie psychanalytique, et au contraire de Foucault, il cherche à maintenir l’exigence de penser la psychanalyse dans sa spécificité relativement aux autres savoirs et pratiques.
La connaissance vitale de la vie : une parallaxe entre Canguilhem et Plessner
Authors: Ebke Thomas
Published: December 2019

Cet article se donne pour but d’inaugurer un dialogue philosophique entre deux penseurs qui, jusqu’à aujourd’hui, n’avaient jamais été rapprochés l’un de l’autre. Il vise à comparer l’anthropologie philosophique de Helmuth Plessner (1892-1985) et l’épistémologie historique de Georges Canguilhem (1904-1995) en croisant leurs perspectives selon une progression en trois actes : à partir du concept de la vie, à travers l’idée d’une connaissance de la vie, puis par la figure d’une connaissance vitale de la vie. Cette clé de lecture sert à rendre intelligible un vrai parallélisme entre deux projets philosophiques qui, du point de vue de leurs généalogies respectives, n’entretiennent aucun rapport entre eux. Or, ce qui émerge par le biais de cet article, c’est la fécondité des réflexions de Canguilhem et Plessner en matière d’une critique des sciences de la vie contemporaines, et aussi la façon dont ces deux approches se complètent et se renforcent l’une l’autre.
The Political Economy of the Market
Authors: Ozer-Imer Itir , Aydin Derya Guler
Published: December 2019

In the modern period, there are two concerns regarding the nature of the market. One is associated with market structures that involve solely the economic sphere and exclude all other factors including historical, social, and institutional ones. Hence, it conducts a static analysis, while the other relates the market process with all the aforementioned factors in addition to the economic ones, and therefore, combines economic and non-economic spheres, and the analysis becomes dynamic. This chapter scrutinizes the conceptualization of the market; that is whether the market is considered as a “structure” or a “process”. With this consideration, authors relate the conceptualization of the market with the type of competition. When the market is regarded as a “process”, it is possible to claim that market becomes an “institution”. Thus, by taking the market as an institution and considering competition within a dynamic framework, the emergent economic theoretical structure provides an in-depth, comprehensive, analytical, and novel approach to real economic and social concerns.
The Effect of Democratization and Economic Freedom on Economic Growth
Authors: Oral Ibrahim Orkun
Published: December 2019

This chapter examines the impact of democratization and economic freedom on economic growth. For this purpose, according to the classification issued by the World Bank, three groups of countries, developed, developing, and underdeveloped, were included in the study. The impact of democratization and economic freedom on economic growth was tested by panel data analysis in the period of 1995-2012. As a result of the analysis, the relationship between democracy-economic freedom and economic growth has been different according to country groups. While there was a positive relationship between economic growth and democracy-economic freedom in developed and underdeveloped countries, a negative relationship was found in the developing country group.
Virtual Element Method: Micro-Mechanics Applications
Authors: Lo Cascio Marco , Milazzo Alberto , Benedetti Ivano
Published: December 2019

In this contribution we present an application of the lowest order Virtual Element Method (VEM) to the problem of material computational homogenization. Material homogenization allows retrieving material properties through suitable volume averaging procedures, starting from a detailed representation of the micro-constituents of the considered material. The representation of such microstructure constitutes a remarkable effort in terms of data/mesh preparation, especially when there is not evident microstructural regularity. For such a reason, computational micromechanics may represent a challenging benchmark for showing the potential of VEM. In this contribution, polycrystalline materials are considered as an application. The proposed technique constitutes a first step towards modelling of damage processes in micro-structured materials
Numerical and Experimental Investigation on the Energy Absorption Capability of a Full-Scale Composite Fuselage Section
Authors: Perfetto Donato , Lamanna Giuseppe , Manzo M. , Chiariello A. , di Caprio F. , di Palma L.
Published: December 2019

In the case of catastrophic events, such as an emergency landing, the fuselage structure is demanded to absorb most of the impact energy preserving, at the same time, a survivable space for the passengers. Moreover, the increasing trend of using composites in the aerospace field is pushing the investigation on the passive safety capabilities of such structures in order to get compliance with regulations and crashworthiness requirements. This paper deals with the development of a numerical model, based on the explicit finite element (FE) method, aimed to investigate the energy absorption capability of a full-scale 95% composite made fuselage section of a civil aircraft. A vertical drop test, performed at the Italian Aerospace Research Centre (CIRA), carried out from a height of 14 feet so to achieve a ground contact velocity of 30 feet/s in according to the FAR/CS 25, has been used to assess the prediction capabilities of the developed FE method, allowing verifying the response under dynamic load condition and the energy absorption capabilities of the designed structure. An established finite element model could be used to define the reliable crashworthiness design strategy to improve the survival chance of the passengers in events such as the investigated one.
Low Cycle Fatigue Behavior of Superalloy GH4169 in High Temperature Gas Environment
Authors: Ding Xin , Huang Da Wei , Yan Xiao Jun
Published: December 2019

Turbine components (blades, guides and casing) of gas turbine engine usually suffer from fatigue load in company with a HTG environment in service. The corrosive substances in HTG can deposit on the surface of turbine components and induce accelerated damage known as hot corrosion. In this study, an experimental system is designed and built up to conduct LCF tests of superalloy in HTG environment. The influence of HTG on the LCF behavior of the nickel-base superalloy GH4169 at 650°C is studied. According to the test results, the average fatigue life of the specimens in HTG environment (22270 cycles) is about 31.5% less than that in air (32496 cycles). The protective oxide film on the surface of the specimen can be destroyed by the electrochemical reaction between HTG and oxide film. Compared with the specimen tested in air, there are more fatigue sources in the specimen tested in HTG environment, and the transgranular–intergranular transition occurs in the crack growth area.
Study of the Viscoelasticity of Chopped Aramid Fiber Reinforced Rubber Composite
Authors: Gao Jian Hong , Yang Xiao Xiang
Published: December 2019

The chopped aramid fiber reinforced rubber composite (AFRC) has been widely used in the tire treads for its excellent characteristics. The viscoelasticity which is an important mechanical property for rubber matrix would be influenced by the adding of aramid fiber. In this study, the dynamic and quasi-static viscoelasticity were investigated via the dynamic thermal analysis experiment and the mullins experiment with multi-step relaxation, respectively. The frequency and temperature scanning were employed for AFRC with different fiber volume fractions, fiber aspect ratios and fiber orientation distributions. The effects of constituent parameters on the dynamic viscoelasticity were studied as well as the general rule of reinforcing effect of aramid fiber on rubber materials was presented. The stress relaxtion for AFRC were analysed basing on the experimental results. In addition, The ability of the viscoelastic constitutive model to describe the quasi-static viscoelastic behavior of AFRC were explored.
Probability Ellipse Method for Damage Detection in a Composite Winglet
Authors: Petrone Giuseppe , de Fenza A. , Perfetto Donato , de Luca A. , Sorrentino A. , Caputo Francesco
Published: December 2019

It is well known that composite materials are founding increasing applications in the transport field thanks to their high strength to mass ratio. However, their use in primary structures is very challenging because of their high sensitivity to in-service damages and manufacturing defects. As a result, the current adopted damage tolerance approach leads to the oversizing of such structures. Structural health monitoring systems, aimed to the real time damage detection, can provide several benefits in terms of lightweight of the structures, maintenance operations and inspection costs. This paper deals with the use of the Probability Ellipse (PE) method, based on the propagation of ultrasonic guided waves on a composite winglet of a small aircraft. The PE method estimates the probability of the presence of the damage in the monitored area, starting from the knowledge of selected damage indexes for each sensors-path. The winglet, equipped with piezoelectric sensors, usable as both actuating and receiving devices, has been numerically and experimentally investigated under several configurations, varying the actuator location. Sensitivity analysis has been performed to assess the effectiveness of the PE method. The accuracy of the PE method in detecting both location and damaged area is herein discussed.
Crack Tip Stress Field Analysis of Crack Surface Contact and Opening during In Situ Wedge Loading of Human Enamel
Authors: Salvati Enrico , Besnard Cyril , Harper Robert A. , Moxham Thomas , Shelton Richard M. , Landini Gabriel , Korsunsky Alexander M.
Published: December 2019

Shallow cracks are often observed in dental enamel, however do not normally lead to deep fractures. Previous work has highlighted the toughening mechanisms that operate in enamel during crack propagation, but very little is known about the deformation and stress fields arising around the propagating cracks during realistic loading conditions. This work aims to elucidate how the stresses are distributed within human dental enamel when a pre-existing crack is subjected to opening and surface contact with in situ indentation. We present a synchrotron-based insitu analysis coupled with a linear elastic finite element method simulation. The experimental reconstructed stress fields identified a prominent residual stress within the enamel, accompanied by a visible pattern that appeared clearly associated with its underlying microstructure. The numerical modelling of the stress field and discerning of surface contact and crack opening caused by the indentation was subsequently possible, even if in this study the influence of the anisotropy induced by the presence of features at a smaller scale was neglected. The implications of these findings and directions for future research are discussed.
Obesity - The Epidemic like no other in human history
Authors: Kahandawa Shaminda
Published: December 2019

No abstract available
Revalidation of Sri Lankan Doctors: Why it should be voluntary
Authors: Epa Sunil Seneviratne
Published: December 2019

No abstrRevalidation of Sri Lankan Doctorsact available