bluuebunny/crossref_metadata_2025 huggingface dataset:
The ALMA Spectroscopic Survey in the HUDF: Deep 1.2 mm Continuum Number Counts
Authors: González-López Jorge , Novak Mladen , Decarli Roberto , Walter Fabian , Aravena Manuel , Carilli Chris , Boogaard Leindert , Popping Gergö , Weiss Axel , Assef Roberto J. , Bauer Franz Erik , Bouwens Rychard , Cortes Paulo C. , Cox Pierre , Daddi Emanuele , Cunha Elisabete da , Díaz-Santos Tanio , Ivison Rob , Magnelli Benjamin , Riechers Dominik , Smail Ian , Werf Paul van der , Wagg Jeff
Published: July 2020

We present the results from the 1.2 mm continuum image obtained as part of the Atacama Large Millimeter/submillimeter Array Spectroscopic Survey in the Hubble Ultra Deep Field. The 1.2 mm continuum image has a size of 2.9 (4.2) arcmin2 within a primary beam response of 50% (10%) and an rms value of

. We detect 35 sources at high significance (Fidelity ≥0.5); 32 have well-characterized near-infrared Hubble Space Telescope counterparts. We estimate the 1.2 mm number counts to flux levels of

in two different ways: we first use the detected sources to constrain the number counts and find a significant flattening of the counts below S

ν
 ∼ 0.1 mJy. In a second approach, we constrain the number counts using a probability of deflection statistics (P(D)) analysis. For this latter approach, we describe new methods to accurately measure the noise in interferometric imaging (employing jackknifing in the cube and in the visibility plane). This independent measurement confirms the flattening of the number counts. Our analysis of the differential number counts shows that we are detecting ∼93% (∼100% if we include the lower fidelity detections) of the total continuum dust emission associated with galaxies in the Hubble Ultra Deep Field. The ancillary data allow us to study the dependence of the 1.2 mm number counts on redshift (z = 0−4), galaxy dust mass (

), stellar mass (

), and star formation rate (

). In an accompanying paper we show that the number counts are crucial to constrain galaxy evolution models and the understanding of star-forming galaxies at high redshift.
Using Stereoscopic Observations of Cometary Plasma Tails to Infer Solar Wind Speed
Authors: Cheng Long , Zhang Quanhao , Wang Yuming , Li Xiaolei , Liu Rui
Published: July 2020

Detection of the solar wind speed near the Sun is significant in understanding the heating and acceleration of the solar wind. Cometary plasma tails have long been used as natural probes for solar wind speed; previous solar wind speed estimates via plasma tails, however, were based on comet images from a single viewpoint, and the projection effect may influence the result. Using stereoscopic observations from the Solar Terrestrial Relations Observatory and the Solar and Heliospheric Observatory, we three-dimensionally reconstruct the plasma tails of three comets C/2012 S1 (ISON), C/2010 E6, and C/2011 W3 (Lovejoy) and infer the ambient solar wind speed. The first comet is located between 3.5 and 6 solar radii (Rs) away from the Sun at high latitudes; the estimated solar wind speed is about 300–500 km s−1. The second comet is located within 10 Rs and about 20° away from the ecliptic; the estimated solar wind speed is about 200–320 km s−1. The third comet is also located at low latitudes but farther (>20 Rs) away from the Sun; the estimated solar wind speed is about 100–600 km s−1. For comets near the ecliptic, our results are close to those predicted by MHD models, whereas for the comet at high latitudes, the deviation between our estimate and the model results is notable. This consistency and difference could be used to constrain and improve solar wind models. We will seek opportunities to apply the method to comet 322P, whose tail may sweep the Parker Solar Probe.
Dynamical Evolution of Cosmic Supermassive Binary Black Holes and Their Gravitational-wave Radiation
Authors: Chen Yunfeng , Yu Qingjuan , Lu Youjun
Published: July 2020

We investigate the evolution of supermassive binary black holes (BBHs) in galaxies with realistic property distributions and the gravitational-wave (GW) radiation from the cosmic population of these BBHs. We incorporate a comprehensive treatment of the dynamical interactions of the BBHs with their environments by including the effects of galaxy triaxial shapes and inner stellar distributions, and generate a large number of BBH evolution tracks. By combining these BBH evolution tracks, galaxy mass functions, galaxy merger rates, and supermassive black hole–host galaxy relations into our model, we obtain statistical distributions of surviving BBHs, BBH coalescence rates, the strength of their GW radiation, and the stochastic GW background (GWB) contributed by the cosmic BBH population. About ∼1%–3% (or

) of supermassive BHs at nearby galactic centers are expected to be binaries with mass ratio

(or

). The characteristic strain amplitude of the GWB at frequency

is estimated to be

, and the upper bound of its results obtained with the different BH–host galaxy relations can be up to

, which await testing by future experiments (e.g., the Square Kilometer Array, FAST, Next-Generation Very Large Array). The turnover frequency of the GWB spectrum is at

. The uncertainties on the above estimates and prospects for detecting individual sources are also discussed. The application of the cosmic BBH population to the Laser Interferometer Space Antenna (LISA) band provides a lower limit to the detection rate of BBHs by LISA,

.
Testing General Relativity with the Stellar-mass Black Hole in LMC X-1 Using the Continuum-fitting Method
Authors: Tripathi Ashutosh , Zhou Menglei , Abdikamalov Askar B. , Ayzenberg Dimitry , Bambi Cosimo , Gou Lijun , Grinberg Victoria , Liu Honghui , Steiner James F.
Published: July 2020

The iron-line and continuum-fitting methods are currently the two leading techniques for measuring black-hole spins with electromagnetic radiation. They can be naturally extended for probing the spacetime geometry around black holes and testing general relativity in the strong field regime. In the past couple of years, there has been significant work to use the iron-line method to test the nature of black holes. Here we use the continuum-fitting method and we show its capability of constraining the spacetime geometry around black holes by analyzing 17 Rossi X-ray Timing Explorer data of the X-ray binary LMC X-1.
Physical Conditions in Shocked Interstellar Gas Interacting with the Supernova Remnant IC 443*
Authors: Ritchey Adam M. , Jenkins Edward B. , Federman S. R. , Rice Johnathan S. , Caprioli Damiano , Wallerstein George
Published: July 2020

We present the results of a detailed investigation into the physical conditions in interstellar material interacting with the supernova remnant (SNR) IC 443. Our analysis is based on a comprehensive examination of high-resolution far-ultraviolet spectra obtained with the Space Telescope Imaging Spectrograph onboard the Hubble Space Telescope of two stars behind IC 443. One of our targets (HD 43582) probes gas along the entire line of sight through the SNR, while the other (HD 254755) samples material located ahead of the primary supernova shock front. We identify low-velocity quiescent gas in both directions and find that the densities and temperatures in these components are typical of diffuse atomic and molecular clouds. Numerous high-velocity components are observed in the absorption profiles of neutral and singly ionized atomic species toward HD 43582. These components exhibit a combination of greatly enhanced thermal pressures and significantly reduced dust-grain depletions. We interpret this material as cooling gas in a recombination zone far downstream from shocks driven into neutral gas clumps. The pressures derived for a group of ionized gas components at high positive velocity toward HD 43582 are lower than those of the other shocked components, pointing to pressure inhomogeneities across the remnant. A strong, very high velocity component near −620 km s−1 is seen in the absorption profiles of highly ionized species toward HD 43582. The velocity of this material is consistent with the range of shock velocities implied by observations of soft thermal X-ray emission from IC 443. Moderately high velocity gas toward HD 254755 may represent shocked material from a separate foreground SNR.
Carbonaceous Chondrites and the Condensation of Elements from the Solar Nebula
Authors: Vollstaedt Hauke , Mezger Klaus , Alibert Yann
Published: July 2020

Common features of all carbonaceous chondrite groups are invariant refractory element ratios, depletions of moderately volatile elements as a function of their condensation temperature (T
C), and strongly depleted highly volatile element concentrations independent of T
C. The depletion of volatile elements with respect to the bulk solar system composition requires a separation of gas from solids in the solar nebula. Several models have been proposed to explain the decoupling of gas and solids, but not all are compatible with astrophysical, chemical, and petrologic constraints. Here existing physical models are integrated with measured element concentrations, measured and modeled physical properties of protoplanetary disks, and planetary-scale nucleosynthetic and stable isotope variations to establish a conceptual model for the condensation and accretion of elements into planetesimals. In this model, the chemical composition of chondrites is established by element condensation in a cooling solar nebula that changed its surface density as a function of time and temperature. The model predicts peak temperatures at the condensation sites of about 1400 K that consequently decreased due to a diminishing heat source originating from viscous heating and radiation, accompanied by continuous removal of gas from the nebula surface by photoevaporation. The coupled evolution of condensing solids from a nebula of diminishing surface density resulted in a pattern of decreasing moderately volatile abundances with decreasing T
C. The reduction of nebula opacity due to the chondrule-forming process significantly increased nebula cooling rates and led to the near-chondritic relative abundances of highly volatile elements observed in carbonaceous chondrites.
Continuum-fitting the X-Ray Spectra of Tidal Disruption Events
Authors: Wen Sixiang , Jonker Peter G. , Stone Nicholas C. , Zabludoff Ann I. , Psaltis Dimitrios
Published: July 2020

We develop a new model for X-ray emission from tidal disruption events (TDEs), applying stationary general relativistic “slim disk” accretion solutions to supermassive black holes (SMBHs) and then ray-tracing the photon trajectories from the image plane to the disk surface, including gravitational redshift, Doppler, and lensing effects self-consistently. We simultaneously and successfully fit the multi-epoch XMM-Newton X-ray spectra for two TDEs: ASASSN-14li and ASASSN-15oi. We test explanations for the observed, unexpectedly slow X-ray brightening of ASASSN-15oi, including delayed disk formation and variable obscuration by a reprocessing layer. We propose a new mechanism that better fits the data: a “slimming disk” scenario in which accretion onto an edge-on disk slows, reducing the disk height and exposing more X-rays from the inner disk to the sightline over time. For ASASSN-15oi, we constrain the SMBH mass to

. For ASASSN-14li, the SMBH mass is

, and the spin is >0.3. For both TDEs, our fitted masses are consistent with independent estimates; for ASASSN-14li, application of the external mass constraint narrows our spin constraint to >0.85. The mass accretion rate of ASASSN-14li decays slowly, as ∝t
−1.1, perhaps due to inefficient debris circularization. Over ≈1100 days, its SMBH has accreted ΔM ≈ 0.17M
⊙, implying a progenitor star mass of >0.34M
⊙, i.e., no “missing energy problem.” For both TDEs, the hydrogen column density declines to the host galaxy plus Milky Way value after a few hundred days, suggesting a characteristic timescale for the depletion or removal of obscuring gas.
New Constraints on the Origin of Surface Brightness Profile Breaks of Disk Galaxies from MaNGA
Authors: Tang Yimeng , Chen Qianhui , Zhang Hong-Xin , Lin Zesen , Chen Guangwen , Gao Yulong , Liang Zhixiong , Liu Haiyang , Kong Xu
Published: July 2020

In an effort to probe the origin of surface brightness profile (SBP) breaks widely observed in nearby disk galaxies, we carry out a comparative study of stellar population profiles of 635 disk galaxies selected from the Mapping Nearby Galaxies at Apache Point Observatory spectroscopic survey. We classify our galaxies into single exponential (Ti), down-bending (Tii), and up-bending (Tiii) SBP types and derive their spin parameters and radial profiles of age/metallicity-sensitive spectral features. Most Tii (Tiii) galaxies have down-bending (up-bending) star formation rate (SFR) radial profiles, implying that abrupt radial changes of SFR intensities contribute to the formation of both Tii and Tiii breaks. Nevertheless, a comparison between our galaxies and simulations suggests that stellar migration plays a significant role in weakening down-bending Σ⋆ profile breaks. While there is a correlation between the break strengths of SBPs and age/metallicity-sensitive spectral features for Tii galaxies, no such correlation is found for Tiii galaxies, indicating that stellar migration may not play a major role in shaping Tiii breaks, as is also evidenced by a good correspondence between the break strengths of Σ⋆ and SBPs of Tiii galaxies. We do not find evidence for galaxy spin being a relevant parameter for forming different SBP types, nor do we find significant differences between the asymmetries of galaxies with different SBP types, suggesting that environmental disturbances or satellite accretion in the recent past do not significantly influence the break formation. By dividing our sample into early and late morphological types, we find that galaxies with different SBP types follow nearly the same tight stellar mass–

relation, which makes the hypothesis that stellar migration alone can transform SBP types from Tii to Ti and then to Tiii highly unlikely.
Extending the FOTE Method to Three-dimensional Plasma Flow Fields
Authors: Wang Z. , Fu H. S. , Olshevsky V. , Liu Y. Y. , Liu C. M. , Chen Z. Z.
Published: July 2020

In this study, we examine whether the First-Order Taylor Expansion (FOTE) method can be applied to steady-state plasma flow fields in space. We particularly examine whether this method (termed FOTE-V) can be used to identify the flow critical points (including both stagnation point and vortex center) and reconstruct the flow patterns around these points. Quantitatively, we test the accuracy of this method using 3D kinetic simulation data, and find the FOTE-V method can give accurate reconstruction results within an area about 2 times the size of the spacecraft tetrahedron, particularly when there are no clear nonlinear flow structures in the simulation box. With simulation data, we also reveal the ability of the FOTE-V method on reconstructing 3D flow field topology of both radial-type null and spiral-type nulls. We further test the accuracy of this method using measurements from NASA’s Magnetospheric Multi-scale (MMS) mission. In a current sheet crossing event, the FOTE-V method successfully identifies the spiral-type nulls in the reconnection exhaust region. In an EDR crossing event, the FOTE-V method detects the stagnation point near the reconnection center. We find these 3D flow structures are quasi-linear at the MMS separation scale. Utilizing the continuity equation of the steady flow, we define a parameter,

, to quantify the error of this method—the smaller this parameter the better the results. This study demonstrates that the plasma flows at small scale are indeed linear, and thus the FOTE-V method can be applied to such flow fields. In particular, this method will be useful to study stagnation points and electron vortices in space plasmas.
The Thermal Equilibrium Mass-loss Model and Its Applications in Binary Evolution
Authors: Ge Hongwei , Webbink Ronald F , Han Zhanwen
Published: July 2020

Binary evolution is indispensable in stellar evolution to understand the formation and evolution of most peculiar and energetic objects, such as binary compact objects, Type Ia supernovae, X-ray binaries, cataclysmic variables, blue stragglers, hot subdwarfs, and central binaries in planetary nebulae. Mass transfer in binary stars can change the evolutionary path and fate of the components compared to what is expected from single stellar evolution. The critical mass ratio at which unstable mass transfer occurs is an unsolved fundamental problem in binary evolution. To resolve this issue, we construct the thermal equilibrium mass-loss model and derive critical mass ratios for both thermal-timescale mass transfer and unstable mass transfer, the latter of which occurs when the outer Lagrangian point, L2, is overfilled. Using several 3.2 M
⊙ stellar models as examples, we study the stellar response to thermal equilibrium mass loss and present the thresholds for thermal-timescale mass transfer. We study the possible mass-transfer channels of binary systems containing a 3.2 M
⊙ donor star, taking into account thermal-timescale mass transfer, unstable mass transfer through L2, and dynamical-timescale mass transfer. We repeat this simulation for a grid of donor stars with different masses (from 0.1 to 100 M
⊙ with Z = 0.02) and at different evolutionary stages, and present our results. The results show that unstable mass transfer due to the overfilling of the outer Lagrangian point may also play an essential role in the formation of common envelopes for late red giant branch and asymptotic giant branch donors.
Regression in the Symptoms and Discal Hernia in Case of Lumbar Radiculopathy
Authors: Ivanova M. A. , Parfenov V. A. , Silina Ekaterina , Isaykin A. I.
Published: July 2020

BACKGROUND: Discogenic lumbar radiculopathy has a favorable potential for survival; the regression of clinical symptoms may outpace the subsidence of discal hernia.
AIM: The objective of the study is comparing the clinical data and the results of magnetic resonance imaging (MRI) in patients with discogenic lumbar radiculopathy over 1 year of observation.
MATERIALS AND METHODS: Thirty-two patients (13 males at the average age of 39.1 ± 11.8 years) with discogenic lumbar radiculopathy confirmed by MRI were examined in the study. The intensity of pain condition was assessed using the numerical rating scale; disability was assessed using the Oswestry disability index. Sixteen patients were subjected to repeated MRI.
RESULTS: Statistically significant (p < 0.01) reduction of the average pain intensity and intensity of disability more than 2 times was observed as early as in the first 2 weeks. Gradual reduction of pain and disability was observed during the year. Reduction of discal hernia by more than 50% was observed on average after 8.7 ± 4.7 months.
CONCLUSION: In the case of discogenic radiculopathy, the reduction of pain and related disability far outstrips the regression of the herniation of intervertebral disk.
New records of Clytoctantes alixii (Elliot, 1870) in Eastern Caldas, Colombia
Authors: Gil-Ospina Raul F. , Moreno-López Daniel
Published: July 2020

Clytoctantes alixii is a bird that lives on the edges of old-growth, secondary and cleared forests undergoing regeneration and presents a distribution restricted to Colombia and Venezuela. The species is considered to be at risk of extinction (EN) due to its particular characteristics and restricted distribution. However, knowledge of its ecology and distribution is still incipient. The objective of this study was therefore to expand the knowledge of C. alixii in Caldas, present the southernmost record of the species and describe its behaviour. The species was monitored within the protected areas of the Manso Diversion in the period 2014 and 2017, using mist nets and fixed radius point counts. Two individuals of C. alixii were recorded, both by observation, with one of these subsequently also captured in a forest in an advanced state of succession. Recording of this population is important because it is the southernmost in the Cordillera Central and confirms that habitats with the presence of hollow stem plants largely define the presence of the species, as well as potentially determining the location of other populations of this species within its range of distribution.
First record of albinism in the paca Cuniculus paca (Rodentia, Cuniculidae) in southeast Mexico
Authors: García-Casimiro Erika , Santos-Moreno Antonio
Published: July 2020

Even though there have been reports of anomalies in the colouration of several species of neotropical mammals, these events are considered to be rare within natural populations. Here we report the first case of albinism in the paca (Cuniculus paca). During the months of June and July 2017, we obtained several images of an adult albino male using camera traps in the region of Sierra Norte in Oaxaca, in the southeast of Mexico, in a medium subdeciduous forest.
Tatupa grafei, a new genus and species of Cylapinae (Heteroptera, Miridae) from Brunei Darussalam
Authors: Tyts Veronica D. , Namyatova Anna A. , Damken Claas , Wahab Rodzay A. , Konstantinov Fedor V.
Published: July 2020

A new genus and species, Tatupa grafei Tyts, Namyatova & Konstantinov, gen. et sp. nov. (Heteroptera, Miridae, Cylapinae, Fulviini), is described from Brunei Darussalam. A diagnosis, photographs of the dorsal habitus, scanning micrographs of selected morphological structures, and illustrations of male and female genitalia are provided for this new species. Its taxonomic placement within the subfamily Cylapinae is briefly discussed. A comparison with the morphologically most similar genus, Proamblia Bergroth, 1910, is made, and scanning micrographs of Proamblia are also provided.
On finite length nonbinary sequences with large nonlinear complexity over the residue ring $ \mathbb{Z}_{m} $
Authors: Yi Lin , Zeng Xiangyong , Sun Zhimin
Published: July 2020

In this paper, we characterize all nonbinary sequences of length \begin{document}$ n $\end{document} with nonlinear complexity \begin{document}$ n-4 $\end{document} for \begin{document}$ n\geq9 $\end{document} and establish a formula on the number of such sequences. More generally, we characterize other finite length nonbinary sequences with large nonlinear complexity over \begin{document}$ \mathbb{Z}_{m} $\end{document}.
Several new classes of (balanced) Boolean functions with few Walsh transform values
Authors: Pang Tingting , Li Nian , Zhang Li , Zeng Xiangyong
Published: July 2020

Three classes of (balanced) Boolean functions with few Walsh transform values derived from bent functions, Gold functions and the product of linearized polynomials are obtained in this paper. Further, the value distributions of their Walsh transform are also determined by virtue of the property of bent functions, the Walsh transform property of Gold functions and the \begin{document}$ k $\end{document}-tuple balance property of trace functions respectively.
Tabu search guided by reinforcement learning for the max-mean dispersion problem
Authors: Nijimbere Dieudonné , Zhao Songzheng , Gu Xunhao , Esangbedo Moses Olabhele , Dominique Nyiribakwe
Published: July 2020

We present an effective hybrid metaheuristic of integrating reinforcement learning with a tabu-search (RLTS) algorithm for solving the max–mean dispersion problem. The innovative element is to design using a knowledge strategy from the \begin{document}$ Q $\end{document}-learning mechanism to locate promising regions when the tabu search is stuck in a local optimum. Computational experiments on extensive benchmarks show that the RLTS performs much better than state-of-the-art algorithms in the literature. From a total of 100 benchmark instances, in 60 of them, which ranged from 500 to 1, 000, our proposed algorithm matched the currently best lower bounds for all instances. For the remaining 40 instances, the algorithm matched or outperformed. Furthermore, additional support was applied to present the effectiveness of the combined RL technique. The analysis sheds light on the effectiveness of the proposed RLTS algorithm.
Channel leadership and recycling channel in closed-loop supply chain: The case of recycling price by the recycling party
Authors: Wu Zhidan , Qian Xiaohu , Huang Min , Ching Wai-Ki , Kuang Hanbin , Wang Xingwei
Published: July 2020

Due to the fast growing of the waste electrical and electronic equipment (WEEE), the business values of closed-loop supply chains (CLSCs) have been well recognized. In this paper, we investigate the performance of the CLSCs under different combinations of the recycling channel and the channel leadership when the recycling price is determined by the recycling party. Specially, we consider a CLSC consisting of two channel members, i.e., a manufacturer and a retailer. Each member acting as the channel leader has three different channels to collect the used products, and they are (ⅰ) the manufacturer (M-channel), (ⅱ) the retailer (R-channel) and (ⅲ) the third-party (T-channel). Given the recycling party determines the recycling price, mathematical models are developed to investigate the performance of the CLSC under different combinations of the channel leadership and the recycling channel. Through a comparison analysis, we find that M-channel is the most effective recycling channel. Moreover, once the M-channel be adopted, the retailer-led structure is as good as manufacture-led structure. We find that the recycling channel structure could be more important than the channel leadership in the CLSC. Finally, we illustrate that the CLSC can be coordinated by a two-part tariff contract.
Order allocation model in logistics service supply chain with demand updating and inequity aversion: A perspective of two option contracts comparison
Authors: Liu Weihua , Shen Xinran , Wang Di , Wang Jingkun
Published: July 2020

This paper considers an logistics service supply chain consisting of a logistics service integrator (LSI) and a number of functional logistics service providers (FLSPs). In the environment of demand updating, we focus on the inequity aversion among the FLSPs and introduce two option contracts (the reservation option contract and the option guarantee contract), build the multi-objective programming models, to explore effects of the inequity aversion behavior on the order allocation, and whether the two option contracts can mitigate the impact of inequity aversion on order allocation. Three important conclusions are obtained after two option contracts comparisons: first, there is an optimal update time, at which point, the order allocation results reach the optimal value and tend to be stable. Second, two option contracts both can not only increase the total performance of the supply chain, but also mitigate the impact of inequity aversion on the allocation under certain conditions. Third, when demand decreases, the reservation option contract is better than option guarantee contract, in contrast, when demand increases, option guarantee contract is better.
Una entrevista con Antonio Gilman Guillén. Primera parte
Authors: Vicent García Juan Manuel , Martínez Navarrete M. Isabel , Díaz-del-Río Español Pedro
Published: July 2020

Antonio Gilman Guillén, Profesor Emérito de la Cali­fornia State University-Northridge (EE. UU.) nació en New­ton (Massachusetts, EE. UU.) en 1944 del hispanista Stephen Gilman y Teresa Guillén, hija del poeta Jorge Guillén. Se educó en Harvard College (Grado en Filología Clásica, 1965), Cambridge University (Grado y Master en Arqueo­logía Prehistórica, 1967 y 1971 respectivamente) y Harvard University (Doctor en Antropología, 1974).
El profesor Gilman es un autor de referencia en los EE. UU. sobre la Prehistoria Reciente europea desde hace 40 años. Su dedicación particular a la península ibérica des­de la década de 1970 ha influido en la investigación de este territorio en un doble sentido. Por una parte ha favorecido de manera significativa la internacionalización de los yaci­mientos peninsulares y de los arqueólogos que los estudian en la comunidad académica de lengua inglesa. Por otra, ha mostrado que hay alternativas a la arqueología histórico-cultural, predominante en las universidades europeas. Un buen ejemplo es su interpretación económico-política del registro arqueológico de la Prehistoria Reciente, cuya unidad de análisis es el surgimiento de la desigualdad social. La incorporación del Análisis de Captación de Recursos, entre otras estrategias de la investigación en Geografía, ha sido fundamental para mostrar la viabilidad del proyecto alterna­tivo. Su influencia debe mucho también a su disponibilidad a incorporarse tanto a equipos liderados por arqueólogos locales, como a tareas de evaluación y asesoramiento en organismos públicos de investigación y revistas científicas, como Trabajos de Prehistoria. La Junta de Andalucía así lo reconoció concediéndole en 2012 la Medalla Menga.
La entrevista con Antonio Gilman aprovechó su estancia en la Residencia de Estudiantes (Madrid) durante noviembre de 2019 y se publicará en dos entregas. Este primer artícu­lo se centra en los aspectos biográficos de su formación intelectual y muestra el entrecruzamiento del azar y, por tanto, de la decisión individual, con las redes familiares, de clase, culturales y académicas en una trayectoria científica de excelencia.
Hacia una nueva definición del Neolítico Medio en el sur de la península ibérica: Grañena Baja, Jaén
Authors: Conlin Hayes Elisabet , Martínez Sánchez Rafael M. , Morgado Antonio
Published: July 2020

En este trabajo presentamos los resultados de las exca­vaciones en el yacimiento arqueológico de Grañena Baja (Jaén), correspondientes a la primera fase detectada en el mismo. Destaca la posible existencia de un gran foso seg­mentado, asociado a una cultura material hasta ahora no caracterizada de forma específica en el sur de la península ibérica. Cerámicas de perfil compuesto y borde reforzado con decoraciones sencillas componen el registro. Láminas de formato medio y grande, talón liso y extraídas por per­cusión indirecta caracterizan los instrumentos líticos. Las dataciones disponibles sitúan en el tercer cuarto del V mi­lenio cal AC el momento de plena ocupación en dicha fase. Esas características dotan al yacimiento de un valor excep­cional para completar el vacío existente entre el Neolítico Antiguo y el Neolítico Reciente en gran parte del mediodía peninsular, donde los contextos asociados a dichas cronolo­gías son escasos. Grañena Baja constituye pues una oportu­nidad única para la caracterización de un Neolítico Medio hasta ahora escurridizo.
Modelización de territorios ganaderos en la alta montaña al final del Neolítico: una integración de análisis espacial e información etnográfica
Authors: Gassiot Ballbè Ermengol , Garcia Casas David , Nunes Alonso Joan , Salvador Baiges Guillem
Published: July 2020

En los últimos años la investigación arqueológica en áreas de montaña de la península ibérica está empezando a llenar el vacío de información con extensas secuencias de ocupación durante el Holoceno. En el Pirineo se localiza una cantidad considerable de yacimientos del final del Neolítico/ Calcolítico con cronologías entre el 3350 y 2350 cal ANE. Este fenómeno parece vincularse con la consolidación de la explotación ganadera de las zonas alpinas y subalpinas. En este trabajo se analiza el patrón de dispersión de los yaci­mientos de esta época en el Parque Nacional de Aigüestortes i Estany de Sant Maurici, en el Pirineo central. Se definen mediante SIG áreas de influencia alrededor de los asenta­mientos y caminos óptimos para evaluar dos variables clave en cualquier práctica ganadera: la accesibilidad a los asen­tamientos y a los pastos. Con fines comparativos se analiza también el patrón de los yacimientos de época moderna y contemporánea. El estudio permite concluir diferencias sig­nificativas en la dispersión de los yacimientos de cada épo­ca con relación a los pastos y a los caminos.
Orfebrería castreña en el Museo Arqueológico de Asturias (Oviedo): aproximación a su caracterización arqueométrica y problemas de estudio
Authors: García-Vuelta Óscar , Montero Ruiz Ignacio , Villa Valdés Ángel
Published: July 2020

Se presentan los resultados de la revisión de un grupo de piezas de orfebrería castreña de la II Edad del Hierro conservadas en el Museo Arqueológico de Asturias, que en su mayor parte permanecían insuficientemente estudiadas desde el punto de vista documental y arqueométrico. Este trabajo, centrado principalmente en el análisis no destructivo y la revisión topográfica de los objetos, aporta nuevos datos sobre su tecnología de elaboración. Destaca la identificación de nuevos ejemplos de aplicación de dorado por amalgama de mercurio. La labor realizada supone también un buen ejemplo de las dificultades existentes para el estudio de este tipo de materiales.
Leser-Trélat sign as a rare manifestation of cutaneous melanoma
Authors: Gori Niccolò , Esposito Ilaria , Del Regno Laura , D'Amore Alessandra , Peris Ketty , Di Stefani Alessandro
Published: July 2020

Leser-Trélat Sign (LTS) is a rare paraneoplastic syndrome characterized by the sudden eruption of multiple seborrheic keratoses in patients with internal malignancy, commonly localized in the gastrointestinal tract. We report an 80-year-old female patient showing a rapid increase in the number and size of seborrheic keratosis associated with the diagnosis of a cutaneous nodular melanoma (Breslow thickness: 4.5 mm) located on the right flank. After the excision of melanoma, subsequent staging procedures resulted negative, moreover no evidence of melanoma recurrence and no changes of the seborrheic keratoses was detected after a follow-up of 52 months. Although the association between melanoma and Leser Trelat sign is rare, an accurate skin examination with the aid of dermatoscopy searching for undiagnosed skin cancers, should be suggested in patient with sudden eruption of keratosis seborrheic to early diagnose and treat a possible melanoma.
Oral microbiota and oral cancer: Review
Authors: Kakabadze Mariam Z. , Paresishvili Teona , Karalashvili Lia , Chakhunashvili David , Kakabadze Zurab
Published: July 2020

In this review, we draw attention and discuss the risk factors and causes of the development of oral squamous cell carcinoma (OSCC) focusing on oral microbiota. Recently, a breakthrough in the study of cancer has been the discovery of the relationship between the presence of certain types of bacteria and the development of cancer in the human body. Studies have shown that, Porphyromonas gingivalis (P. gingivalis) bacteria that is responsible for the destructive processes in the oral cavity, could play an important role in the development of OSCC. In our continuing search for bacteria that causes oral squamous cell carcinoma, we came across the Pseudomona aeruginosa, which due to its metabolite properties, may play important role in carcinogenesis of oral cancer. One possible mechanism is the ability of Pseudomonas to synthesize nitric oxide (NO) that modulates different cancer-related appearances such as apoptosis, cell cycle, angiogenesis, invasion, and metastasis. We think that P. aeruginosa increases the concentration of NO by converting salivary nitrite to nitric oxide, and this is how it contributes to NO-related carcinogenesis. Early diagnosis and treatment of periodontitis are very important not only for patients’ oral health, but also for the prevention of OSCC development. Screening test for OSCC based on determination of salivary NO levels could be appealing and may prove to be useful assay for diagnosis and early detection of disease progression in oral cancer.
Athletic Trainers' Perceptions of Anxiety Before, During, and After a Standardized Patient Encounter
Authors: Boddicker Brett , Winkelmann Zachary K. , Neil Elizabeth R. , Walker Stacy E. , Eberman Lindsey E.
Published: July 2020

Context

Standardized patient (SP) encounters are an assessment technique in health and medical education that can improve participants' communication and clinical skills.

Objective

The purpose of this study was to explore experiences of postprofessional athletic trainers before, during, and after a SP encounter.

Design

Qualitative research.

Setting

Before and after participants engaged in the same SP encounter.

Patients or Other Participants

Athletic trainers enrolled in a postprofessional doctor of athletic training program (age = 24 ± 2, years of experience = 3 ± 3).

Main Outcome Measure(s)

Individual, semistructured interviews were completed before and after the SP encounter via teleconferencing software. Interviews were transcribed, and data were analyzed via the consensual qualitative research tradition using a 3-person coding team. Using a multistage process, the team identified common domains and categories to confirm a consensus codebook. Trustworthiness was established using member checking and external auditing.

Results

Four domains emerged during analysis: (1) emotional state, (2) design of encounter, (3) realism, and (4) conscious consideration. Participants identified an emotional state related to self-judgment and feeling overwhelmed by time constraints. The postprofessional learners felt the SP encounter created a safe environment for integrating newly learned skills. Contrastingly, they also expressed uncertainty, as the SP encounter was perceived as an unknown situation. Before the SP encounter, participants doubted their ability to suspend reality but were surprised by the authenticity. They mentioned using self-management strategies for their feelings. After the SP encounter, participants expressed a growth mindset related to improving clinical skills, while others lacked ownership through blaming.

Conclusions

Despite disbelief before the SP encounter, the design of the encounter provided an authentic learning environment for practicing athletic trainers to integrate and rehearse their clinical skills in a safe setting. However, participants expressed anxiety related to the SP encounter that altered their preparation and experience.
A convex approach to the Gilbert–Steiner problem
Authors: Bonafini Mauro , Oudet Édouard
Published: July 2020

We describe a convex relaxation for the Gilbert–Steiner problem both in Rd and on manifolds, extending the framework proposed in [10], and we discuss its sharpness by means of calibration type arguments. The minimization of the resulting problem is then tackled numerically and we present results for an extensive set of examples. In particular we are able to address the Steiner tree problem on surfaces.
From individual-based mechanical models of multicellular systems to free-boundary problems
Authors: Lorenzi Tommaso , Murray Philip J. , Ptashnyk Mariya
Published: July 2020

In this paper we present an individual-based mechanical model that describes the dynamics of two contiguous cell populations with different proliferative and mechanical characteristics. An off-lattice modelling approach is considered whereby: (i) every cell is identified by the position of its centre; (ii) mechanical interactions between cells are described via generic nonlinear force laws; and (iii) cell proliferation is contact inhibited. We formally show that the continuum counterpart of this discrete model is given by a free-boundary problem for the cell densities. The results of the derivation demonstrate how the parameters of continuum mechanical models of multicellular systems can be related to biophysical cell properties. We prove an existence result for the free-boundary problem and construct travelling-wave solutions. Numerical simulations are performed in the case where the cellular interaction forces are described by the celebrated Johnson–Kendalli–Roberts model of elastic contact, which has been previously used to model cell-cell interactions. The results obtained indicate excellent agreement between the simulation results for the individual-based model, the numerical solutions of the corresponding free-boundary problem and the travelling-wave analysis.
PENGARUH METODE COOPERATIVE LEARNING DAN PERSEPSI KINESTETIK TERHADAP HASIL BELAJAR GERAK DASAR MANIPULATIF
Authors: Suhartini Maharani
Published: July 2020

This study aims to determine the effect of the TGT and STAD learning models on manipulative basic motion learning outcomes, to analyze the interaction of cooperative learning models with kinesthetic perceptions on learning outcomes, as well as differences in learning outcomes with TGT and STAD models in students with high and low kinesthetic perceptions. This study uses an experimental method with factorial design. The study was conducted at SDIT Al Madinah in 4th grade students. Data analysis was performed using descriptive analysis and different tests. The results showed that there were significant differences in the learning outcome in the learning model with the TGT model with the STAD model. There is an interaction between learning models with kinesthetic perception on learning outcomes. In the high kinesthetic perception, the learning outcomes of the TGT class are much higher than the STAD class, whereas in the low kinesthetic perception, the learning outcomes of the TGT class are slightly higher than the STAD class.

Abstrak

Penelitian ini bertujuan untuk mengetahui pengaruh model pembelajaran TGT dan STAD pada hasil belajar gerak dasar manipulatif, menganalisis interaksi model cooperative learning dengan persepsi kinestetik pada hasil belajar, serta perbedaan hasil belajar dengan model TGT dan STAD pada siswa dengan persepsi kinestetik tinggi dan rendah. Penelitian ini menggunakan metode eksperimen dengan desain factorial design. Penelitian dilakukan di Sekolah Dasar Islam Terpadu Al Madinah pada siswa kelas 4. Analisis data dilakukan menggunakan analisis deskriptif dan uji beda. Hasil penelitian menunjukkan bahwa terdapat perbedaan signifikan hasil belajar gerak dasar manipulatif pada model pembelajaran dengan model TGT dengan model STAD. Terdapat interaksi antara model pembelajaran dengan persepsi kinestetik pada hasil belajar. Pada persepsi kinestetik tinggi, hasil belajar kelas TGT jauh lebih tinggi dari kelas STAD, sedangkan pada persepsi kinestetik rendah, hasil belajar kelas TGT sedikit lebih tinggi dari kelas STAD.

Kata Kunci: cooperative learning, TGT, STAD, persepsi kinestetik, hasil belajar
Aportes para el fortalecimiento del enfoque metodológico del programa de estimulación cognitiva para adultos mayores.
Authors: Andrade Vera Mario Patricio , Díaz Encalada James Adolfo , Cadena Vizuete María Fernanda
Published: July 2020

El propósito del estudio consistió en evaluar la ejecución del programa de estimulación cognitiva en adultos mayores, con el fin de mejorar la práctica del programa en centros gerontológicos. La muestra estuvo conformada por 15 residentes en el Ancianato Laboure de la ciudad de Quito. El estudio demostró que el 37% mantuvo su nivel cognitivo y el 25% lo mejoró, respecto al dato de la línea de base. El nivel de relación que existe entre la neuroplasticidad y el impacto de los programas de estimulación cognitiva, motivan a la investigación de otras variables importantes tendientes a mejorar la metodología de las intervenciones con adultos mayores.
Intervención educativa a través de redes sociales y talleres para la prevención del virus del papiloma humano en estudiantes universitarios.
Authors: Vásquez Jaramillo Paula Andrea , Vélez Sáenz German Arturo , Ponce Ocaña Erick Renan , Heredia Vásquez Dora Del Roció
Published: July 2020

La investigación permite comparar la efectividad de la intervención educativa a través de redes sociales para la prevención del contagio del virus del Papiloma Humano en estudiantes universitarios de la carrera de Medicina. Se realizará un estudio descriptivo- comparativo longitudinal de diseño no experimental durante un corto periodo de tiempo, aplicado a una muestra de 80 estudiantes entre los 18 y 22 años de los que se obtuvo información sobre características Socio-demográficas, nivel de conocimiento, y prácticas frente al fenómeno investigado en tres etapas. Se demuestra la necesidad de realizar una propuesta dirigida a implementar un programa educativo para motivar a los estudiantes a adquirir conocimiento previniendo el Virus del Papiloma Humano.
El consumo de bebidas energéticas en el desarrollo de las actividades diarias de los estudiantes de la carrera de Medicina de la Universidad Laica Eloy Alfaro de Manabí.
Authors: Mendoza Cevallos Auxiliadora del Rocío , Carreño Acebo Maria Elena , Pérez Mendoza Monserrate Del Rocío , Ganchozo Macías Eva Marilú
Published: July 2020

Durante los últimos años, el consumo de bebidas energizantes se ha vuelto una novedad, esto gracias a las numerosas campañas publicitarias, las cuales las han exhibido como un producto que no tiene efectos secundarios al organismo. En EEUU, los resultados arrojan que el 31% de los adolescentes de 12 a 17 años de edad y el 34% de los adultos jóvenes consumen bebidas energizantes de manera regular. Teniendo en cuenta estos resultados, se nota falta de información por parte de los consumidores de dichas bebidas energizantes y de los efectos que pueden llegar a causar en el organismo. La investigación determina los efectos que producen las bebidas energizantes en el organismo y diseña un plan de acción sobre el consumo de estas bebidas.
El concurso de frecuencias y la participación de las organizaciones sociales de la Región 5.
Authors: Herrera Flores Ana Elizabeth , Campi Maldonado Alejandra Teresa , Andrade Bazan Mónica Joselyn , Vallejo Calderón Pedro Vicente
Published: July 2020

Este estudio pretende determinar cómo afectaron las condiciones y procesos del concurso de frecuencias convocado por Arcotel en el año 2016 a las organizaciones, que vieron en este la posibilidad de adjudicación de una frecuencia, para desarrollar comunicación comunitaria, así como si realmente se ajustaron los procesos a las dinámicas del sector comunitario y la necesidad de una distribución de frecuencias que alcance los porcentajes reconocidos por la Ley de Comunicación para este sector. A través de una revisión sistemática se analiza el contexto del concurso que hasta el momento no presenta resultados finales, la Ley de Comunicación y las organizaciones sociales cuya participación y resultados preliminares muestran un panorama poco alentador.
Cumplimiento de prácticas de responsabilidad social empresarial en las cooperativas de ahorro y crédito de la provincia de Loja y su relación con el segmento cuatro y cinco al cual pertenecen.
Authors: Sarmiento Castillo Germania del Pilar , Peña Vélez Maritza Jackeline , Malla Alvarado Franklin Yovani , Hernández Ocampo Silvana Elizabeth
Published: July 2020

Este artículo pertenece al proyecto macro de investigación “Manual de Indicadores de Responsabilidad Social Empresarial en las cooperativas de ahorro y crédito de la provincia de Loja” desarrollado dentro de la Universidad Nacional de Loja, periodo marzo 2019 - febrero 2021, y hace un análisis de la relación de dependencia entre las actividades de RSE que cumplen las cooperativas con respecto a los segmentos cuatro y cinco, determinando si esta dependencia es o no estadísticamente significativa.
Los elementos constitutivos del teletrabajo y su incidencia en la legislación ecuatoriana.
Authors: Rosero Morán Cristina Mercedes
Published: July 2020

La sociedad del conocimiento con el uso intensivo de las tecnologías de la información y comunicación (TIC), emerge al ámbito laboral en el hecho irreversible de adoptar nuevas modalidades de trabajo, como el innovador y singular teletrabajo, generando evidentemente cambios en la estructura laboral con impactos directos en el ordenamiento jurídico, al incidir con derechos constitucionales y laborales; marco en el que normado por acuerdos ministeriales nació el teletrabajo en Ecuador. Consecuente a tal razonamiento, se logró develar científicamente sus elementos constitutivos, para conocer su incidencia en la legislación ecuatoriana, y la discusión de los aspectos jurídicos más relevantes con planteamientos regulatorios a considerar en una posible ley orgánica especializada, o su inserción en el Código del Trabajo y la Ley Orgánica del Servicio Público.