bluuebunny/crossref_metadata_2025 huggingface dataset:
Determination of absorption coefficients and Urbach tail depth of ZnO below the bandgap with two-photon photoluminescence
Authors: Wang Xiaorui , Yu Dapeng , Xu Shijie
Published: April 2020

In this article, we demonstrate a novel approach to determine the absorption coefficient of ZnO below the bandgap via measuring the self-absorption (SA) effect on the two-photon luminescence (TPL) spectrum of the ZnO bulk crystal rod at cryogenic temperature. Under a geometric configuration of side-excitation and front-detection, the intensities of several major spectral components of TPL spectra of ZnO can be decisively tuned by precisely varying the transmitting distance of luminescence signal, so that the absorption coefficients at different wavelengths can be determined on the basis of Beer-Lambert law. Furthermore, the peak position of donor bound exciton luminescence exhibits a unique redshift tendency with increasing the transmitting distance. Starting from the product of Lorentzian lineshape function and exponential absorption edge of Urbach tail, an analytical formula is derived to quantitatively interpret the experimental redshift characteristic with the transmitting distance. The energy depth of Urbach tail of the studied ZnO crystal is deduced to be ∼13.3 meV. In principle, this new approach can be used to determine absorption coefficient of any luminescent solids as long as the SA effect happens.
Frequency-definable linearly chirped microwave waveform generation by a Fourier domain mode locking optoelectronic oscillator based on stimulated Brillouin scattering
Authors: Zeng Zhen , Zhang Lingjie , Zhang Yaowen , Zhang Zhiyao , Zhang Shangjian , Zhang Yali , Sun Bao , Liu Yong
Published: April 2020

A Fourier domain mode locking (FDML) optoelectronic oscillator (OEO) scheme based on stimulated Brillouin scattering (SBS) is proposed to generate linearly chirped microwave waveforms (LCMWs) with excellent frequency sweep linearity and a precisely controllable frequency sweep range. The kernel of the proposed scheme is a center-frequency-definable SBS-based fast-tunable microwave photonic bandpass filter based on frequency-selective phase-to-intensity conversion, which is realized by using a single laser source to generate a fast frequency-swept probe light and a tunable pump light via electro-optic frequency shifting. A proof-of-concept experiment is carried out to demonstrate the proposed scheme, where LCMWs with flexibly-tunable center frequency and bandwidth are generated. In the experiment, the maximum time-bandwidth product and chirp rate are 82000 and 0.195 GHz/µs, respectively. Most importantly, the frequency deviation is less than 1 MHz and the frequency sweep linearity is smaller than 1.7%, which indicate that the proposed SBS-based FDML OEO can generate frequency-definable LCMWs with excellent frequency sweep linearity.
Highly efficient few-mode spatial beam self-cleaning at 1.5µm
Authors: Leventoux Y. , Parriaux A. , Sidelnikov O. , Granger G. , Jossent M. , Lavoute L. , Gaponov D. , Fabert M. , Tonello A. , Krupa K. , Desfarges-Berthelemot A. , Kermene V. , Millot G. , Février S. , Wabnitz S. , Couderc V.
Published: April 2020

We experimentally demonstrate that spatial beam self-cleaning can be highly efficient when obtained with a few-mode excitation in graded-index multimode optical fibers. By using 160 ps long, highly chirped (6 nm bandwidth at -3dB) optical pulses at 1562 nm, we demonstrate a one-decade reduction of the power threshold for spatial beam self-cleaning, with respect to previous experiments using pulses with laser wavelengths at 1030-1064 nm. Self-cleaned beams remain spatio-temporally stable for more than a decade of their peak power variation. The impact of input pulse temporal duration is also studied.
Diamond Raman oscillator operating at 1178  nm
Authors: Heinzig Matthias , Palma-Vega Gonzalo , Walbaum Till , Schreiber Thomas , Eberhardt Ramona , Tünnermann Andreas
Published: April 2020

In this contribution, we report high-power Raman frequency downconversion based on an Yb-doped fiber amplifier and a linear external diamond Raman cavity. A maximum output power of 136 W with nearly diffraction-limited beam quality was achieved by pumping in quasi-continuous-wave mode with 10% duty cycle and 10 ms on-time duration. For continuous-wave operation, we achieved record average power of 46 W centered at 1178 nm. The emergence of stimulated Brillouin scattering in diamond is further investigated. This technology shows the potential to extend the spectral range of fiber lasers to reach uncommon wavelengths at high power levels.
Planar double-slot antenna integrated into a Nb5N6 microbolometer THz detector
Authors: Xiao Peng , Tu Xuecou , Jiang Chengtao , Li Zhenjie , Zhou Shuyu , Pan Danfeng , Zhao Qingyuan , Jia Xiaoqing , Zhang Labao , Kang Lin , Chen Jian , Wu Peiheng
Published: April 2020

In this Letter, we propose and demonstrate a new type of planar double-slot antenna for a

N
b

5

N

6

microbolometer terahertz (THz) detector. The calculated results show that the planar antenna possessed high coupling efficiency, and the THz signals were obviously focused on the antenna center place. The new planar antenna was integrated with

N
b

5

N

6

microbolometer THz detectors using micro-fabrication technology. The measured results showed that the maximum optical voltage responsivity (

R

o

) of the detectors reached up to 113 V/W at 0.643 THz, and the corresponding noise equivalent power was

44

pW

/

√

H

z

. In addition, the performance of double-slot antennas applied into array detectors in a tunable Fabry–Perot cavity was investigated. The measured results of the

N
b

5

N

6

THz detector remained almost unchanged when the distance between the chip substrate and the copper plate was altered. This indicated that this planar double-slot antenna, which possessed the advantages of high coupling efficiency and easy integration, has great application prospects in a THz detector.
Mid-infrared wavelength conversion using dispersion-engineered As2S5 microstructured optical fiber pumped with an ultrafast laser at 2  µm
Authors: Singh Saini Than , Hoang Tuan Tong , Matsumoto Morio , Sakai Goichi , Suzuki Takenobu , Ohishi Yasutake
Published: April 2020

We fabricate a dispersion-engineered

A
s

2

S

5

microstructured optical fiber for demonstration of frequency conversion in one of the atmospheric-transparent windows in the mid-infrared domain. The experimentally obtained results show that parametric wavelength conversion at 4.5 µm is obtained using fabricated microstructured optical fiber pumped with 200 fs laser pulses of average power of 20 mW at 2 µm. Obtained detuning frequency from the pump frequency was

∼

84

T
H
z

. To the best of our knowledge, the mid-infrared wavelength conversion at 4.5 µm in fiber configuration has been demonstrated for the first time. The experimentally observed result matches well with numerically simulated phase-matching conditions.
Temperature-insensitive Mach–Zehnder interferometer based on a silicon nitride waveguide platform
Authors: Tang Liwei , Li Yu , Li Jiachen , Yang Sigang , Chen Hongwei , Chen Minghua
Published: April 2020

Wavelength shift, caused by temperature fluctuation, critically limits the application of photonic systems. Here, the waveguide geometry is optimized to minimize the wavelength shift due to temperature change and fabrication error. A temperature-insensitive Mach–Zehnder interferometer filter is proposed for a wavelength locker, based on a silicon nitride waveguide. The proposed device achieves a 0.6 pm/K spectral shift over the C-band, which meets the requirements of a wavelength locker for application in dense wavelength division multiplex systems.
The Quiet Contemporary American Novel, Rachel Sykes (2018)
Authors: Morley Catherine
Published: April 2020

Review of: The Quiet Contemporary American Novel, Rachel Sykes (2018)

Manchester: Manchester University Press, 226 pp.,

ISBN 978-1-52610-887-6, h/bk, £80
Potential application of template analysis in qualitative hospitality management research1
Authors: Tabari Saloomeh , King Nigel , Egan David
Published: April 2020

This article is primarily intended for researchers examining hospitality management who are unlikely to be familiar with template analysis (TA) as a form of thematic analysis. It demonstrates the use of TA in a specific setting and how TA contributed to developing a conceptual model and theory of cultural centrism in a hospitality setting. The article offers new perspectives even for those who have prior experience in thematic analysis.
Os mais antigos vestígios humanos na costa sudoeste: o corte de Porto Covo (Sines)
Authors: Cardoso João Luís
Published: April 2020

Revisita-se o corte geológico de Porto Covo, um dos mais importantes do Plistocénico do litoral português. Publicase um notável artefacto lítico nele recolhido in situ, bem como a cronologia absoluta mínima da sequência sedimentar com base nos resultados das determinações de idade por TL. Tais resultados reforçam as conclusões previamente obtidas por critérios estritamente geológicos.
Adornos, espaço e tempo: as contas de colar em Mesas do Castelinho (Santa Clara-a-Nova, Almodôvar)
Authors: Estrela Susana
Published: April 2020

A estratigrafia da Idade do Ferro e de época romana de Mesas do Castelinho (Almodôvar) promove a reflexão sobre os adornos deste povoado e a discussão das diferenças e semelhanças com outros sítios do Sudoeste peninsular. Ainda que em porções reduzidas, as matérias-primas, formas e cores dos adornos são variadas e há uma certa primazia das contas oculadas. O Mediterrâneo mostra-se do princípio ao fim do povoado. Periférico nos grandes circuitos comerciais é um marco num interior que importa os artigos do litoral peninsular e de pontos mais distantes do Mare Nostrum romano.
Castro de Chibanes (Palmela). Trabalhos arqueológicos de 2012 a 2017
Authors: Da Silva Carlos Tavares , Soares Joaquina , Duarte Susana , Coelho-Soares Antónia , Pereira Teresa Rita , Sorìa Vincenzo
Published: April 2020

Apresentam-se os resultados das campanhas de escavação promovidas pelo MAEDS no Castro de Chibanes (Sector Ocidental) entre 2012 e 2017. Confirmam-se as três grandes fases de ocupação fortificada deste arqueossítio (Calcolítico-Bronze inicial, II Idade do Ferro e Período Romano Republicano), bem como a diferenciação desta última fase nas subfases IIIA e IIIB. Do 3º milénio BC, foi posto a descoberto um novo troço de muralha que integra o complexo defensivo da extremidade ocidental do povoado. Durante a II Idade do Ferro foram construídos compartimentos de planta rectangular dispostos ao longo da muralha sidérica. Esta serviu, em parte, de embasamento, após destruição parcial, a muro de delimitação do povoado tardorepublicano. A estrutura urbanística e a tipologia das construções do Período Romano Republicano parecem ter seguido as da II Idade do Ferro.
Dolmen de la Peña del Hombre (Almonaster La Real, Huelva)
Authors: Vázquez José Francisco González
Published: April 2020

Hallazgo de un nuevo dolmen que a día de hoy permanece inédito. El dolmen se encuentra en un paraje (Sierra de la Peña del Hombre) del término municipal de Almonaster la Real, en la Sierra de Huelva, pero muy próximo a la cuenca minera, en una pequeña elevación junto al curso del río Odiel, en las cercanías de la aldea minera de Mina Concepción. Sólo conserva cuatro ortostatos de granito en superficie, perfectamente visibles e identificables. Su forma y disposición, de forma contigua, parece evidenciar que se trata de un dolmen de galería, similar a los que se encuentran en la zona a pocos kilómetros del Lugar, en el paraje de los Azulejos de Santa Ana la Real (Huelva) o junto al embalse del Odiel (Aracena).
Los denominados cilindros decorados de hueso de la prehistoria reciente en la provincia de Cádiz
Authors: Cabeza de Vaca María Narváez , Lazarich María
Published: April 2020

Los objetos cilíndricos decorados, que han sido fabricados en materiales como hueso o marfil, que se localizan en los ajuares funerarios de comunidades primitivas agropecuarias de la Prehistoria reciente, tienen una función aún por determinar. En esta comunicación presentamos un estudio detallado de los cuatro hallazgos de este tipo de objeto en la provincia de Cádiz. Analizamos las materias primas utilizadas y el proceso productivo llevado a cabo para la elaboración de estos objetos (aserrado, raspado, pulido y decorado); realizamos el estudio morfotipométrico y la descripción de los contextos en los que se han localizado, además de la atribución cronológico-cultural. Todo ello nos ha permitido obtener inferencias que nos han posibilitado plantear hipótesis sobre la/las función o funciones que tuvieron.
The metal artefacts from the prehistoric walled enclosure of Castelo Velho de Freixo de Numão within the early metallurgy of north-west of Iberian Peninsula
Authors: Bottaini Carlo , Montero-Ruiz Ignacio , Lopes Susana , Baptista Lídia , Gomes Sérgio , Vale Nelson
Published: April 2020

This paper deals with the preliminary results of the typological and analytical study of a collection of copper-based objects found at the site of Castelo Velho (Freixo de Numão). This collection is associated to different contexts from the 3rd millennium BC (Chalcolithic). The analyses, performed by non-destructive X-ray fluorescence (XRF), show that the metals were produced with almost pure copper and arsenical copper (> 2% As). Impurities, such as As (<2%), Fe, Bi, Ag, Sn, Sb and Ni, were also identified, likely due to their presence in the ores used for the production of the objects. The data suggest that the metals from Castelo Velho may be framed within the metallurgical production already known for the Chalcolithic of the North-Western Iberian Peninsula.
Vozes de silêncio. O que resta de Castelo Velho? Topografias de poeira intraduzíveis
Authors: Alves-Ferreira Joana
Published: April 2020

Este texto resulta do exercício de “voltar” ao sítio arqueológico de Castelo Velho através dos fragmentos da sua escrita, produzida, exclusivamente, por Susana Soares Lopes entre 1993 e 2014. Este exercício afigura-se por um movimento a dois tempos. O primeiro, historiográfico, pontuado pelo ritmo histórico da marcha dos textos e seguindo a sua ordem cronológica; o segundo, de carácter genealógico e manifestando-se nos intervalos do texto como leitura dos seus incidentes, visa o desmonte do contínuo figurativo do texto, debruçando-se na descoberta dos seus vestígios e impressões. Tratou-se, afinal, de uma revisitação dos documentos que concorreram para a transformação do sítio em monumento, no qual se procurou reflectir acerca das ruínas do sentido de Castelo Velho, explorando os limites da enunciação inerentes ao discurso arqueológico sobre um lugar que resiste, infinitamente, enquanto indício de uma contingência absoluta
A (re) construção de Castelo Velho
Authors: Pereira Mariana P. L.
Published: April 2020

Este artigo procura delinear as principais linhas de pensamento que teorizaram e deram forma a Castelo Velho de Freixo de Numão. Através da análise de catorze trabalhos académicos, explora-se como o sítio arqueológico derivou de um processo dialéctico, entre os investigadores que lhe dirigiram as suas questões, interesses e perspectivas, e as materialidades e espaços que foram dando forma ao sítio. O caminho narrativo parte da reflexão sobre o charme da ruína, passa pela analogia do vaso e pela coreografia do fragmento, para ir de encontro ao arqueólogo “re-construtor”. A questão subjacente ao artigo é: de que forma a idealização de Castelo Velho se alterou nas narrativas dos arqueólogos?
Breves apontamentos para uma biografia de Castelo Velho de Freixo de Numão
Authors: Vieira Alexandra
Published: April 2020

Procurámos com este trabalho compilar um conjunto de dados dispersos, que nos permitem traçar a “história de vida”, a “biografia” de Castelo Velho de Freixo de Numão. A sua longa ocupação ao nível da Pré-História Recente revela-se apenas como um momento do seu percurso no tempo. Castelo Velho é um lugar com uma ampla diacronia. Existem evidências de que o topo do morro, onde se localiza o recinto pré-histórico, foi palco de alterações pontuais noutros períodos históricos. Iremos apresentar alguns desses dados e tentar perceber como estudar estes “Lugares Persistentes na Paisagem”.
Em torno das arquitecturas do sítio de Castelo Velho, Freixo de Numão
Authors: Costa Ana Isabel De Oliveira
Published: April 2020

As “arquitecturas” no plural prende-se com a possibilidade de interpretações várias da reconstituição arquitectónica do sítio de Castelo Velho com base nas evidências arqueológicas observadas e registadas nas campanhas arqueológicas. O levantar das hipóteses sobre o sistema construtivo e espacial do sítio de Castelo Velho, apoia-se assim, sobre o que foi escrito sobre o lugar e sobre lugares similares e o modo como as questões da arquitectura se posicionam face ás interpretações e interrogações que dai decorrem. Para a construção das hipóteses é também usada, mesmo tendo em conta as limitações de tal exercício, informação sobre sistemas e exemplos construtivos tradicionais, alguns ainda em uso nos nossos dias.
GEOMETRIA, PERSPECTIVA E REPRESENTAÇÃO EM JOÃO DE RUÃO
Authors: Vaz Ana Margarida , Craveiro Maria
Published: April 2020

A grande diferença entre os procedimentos medievais e modernos reside sobretudo na captação de um carácter científico que se avoluma a partir da construção e divulgação dos textos que fundam na Antiguidade o pilar do conhecimento e de uma atitude que passará a nortear a encomenda e a produção oficinal. Sobretudo a partir do século XV, a literatura que iria formatar a produção artística e tornar-se a ferramenta imprescindível para execução do trabalho funcionaria também como indicador de erudição e, consequentemente, como ingrediente vital para a conquista do estatuto social do artista, colado ao conhecimento. O domínio da matemática, da geometria, das regras da perspectiva e da proporção, aliadas à perícia no tratamento de anatomias e paisagens dentro da consciência iconográfica da representação religiosa, faria assim o êxito de uma produção oficinal com maior ou menor capacidade de implantação no mercado laico e eclesiástico.

É neste universo científico, extraído de referências múltiplas, que opera João de Ruão. As suas composições retabulares, invocando sempre a presença da arquitetura na formulação de uma atmosfera ideal, dirigem-se tanto à obediência da iconografia religiosa, como ao rigor da construção matemática e geométrica na ordenação compositiva, como ao equilíbrio de uma representação que tem por missão a sondagem ao papel do humano na sua relação com Deus. O retábulo da Misericórdia de Coimbra (MNMC) oferece exatamente essa dimensão relacional que, neste caso concreto e de forma inusitada, se transmuta, pervertendo a leitura e a compreensão do ciclo teológico aqui em causa.
JOÃO DE RUÃO E A CASA DA ESCULTURA DA RENASCENÇA EM PORTUGAL MUSEALIZAÇÃO DE UMA OBRA SINGULAR
Authors: Vaz Ana Margarida , Ferrão Pedro
Published: April 2020

Entre obras documentadas e outras atribuídas a João de Ruão, o Museu Nacional de Machado de Castro tem, à sua guarda, um número muito significativo da sua extensa produção artística. Com diferentes proveniências, quase todas de Coimbra e da sua região, as peças apresentam várias tipologias, desde a singular e colossal edificação arquitetónica da denominada “Capela do Tesoureiro”, passando por diversas esculturas de vulto, avulsas, e conjuntos escultóricos em relevo, inseridos em pequenos e grandes formatos retabulares. Ao longo de mais de cem anos, e de acordo com diferentes conceções museográficas, o Museu transformou-se, a partir da obra de João de Ruão, na verdadeira “casa” da escultura renascentista em Portugal.
EL SEPULCRO DEL ARZOBISPO DON FRANCISCO BLANCO COMO EJEMPLO DEL “ARTE CONTAMINADO” DE MATEUS LOPES.
Authors: Vaz Ana Margarida , Goy Diz Anna
Published: April 2020

La muerte de João de Ruão, ocurrida en Coimbra, en 1580, coincide con los últimos años del arzobispado de don Francisco Blanco de Salcedo, que rigió la sede compostelana entre 1574-81. A su fallecimiento, sus testamentarios encargaron el diseño de su sepulcro al arquitecto portugués Mateus Lopes, que hacía un par de años que se asentara en la ciudad. A través de este proyecto, este maestro introdujo en Galicia ese estilo contaminado, tan típico del quinientismo portugués y relacionado con la obra de João de Ruão, en el cual se combina arquitectura y escultura en una obra de arte total.

A este encargo le siguieron otros de mayor relevancia, pero el sepulcro del arzobispo Blanco debe ser considerado el precedente que sirvió de base al diseño y desarrollo de proyectos posteriores, por lo que su importancia y trascendencia debe ser reconsiderada.
JOÃO DE CASTILHO, LUCAS FERNANDES E O PORTAL DA IGREJA DA MISERICÓRDIA DO SARDOAL
Authors: Vaz Ana Margarida , Silva Ricardo
Published: April 2020

Por intermédio da investigação documental quinhentista existente no Arquivo Histórico da Santa Casa da Misericórdia de Sardoal, tornou-se possível clarificar um conjunto de incertezas historiográficas em torno do processo construtivo da igreja da Misericórdia, sobretudo, quanto à sua cronologia e os mestres envolvidos na respetiva empreitada. Desse modo, o elenco documental remanescente revela-nos que a reconstrução da igreja da Misericórdia sardoalense partiu de uma traça elaborada por João de Castilho e a execução da empreitada ficou a cargo de Lucas Fernandes, do pedreiro natural de Coimbra, que arrematou a obra pelo valor de 120.000 reais.
Eigenvalue Placement by Quantifier Elimination - the Static Output Feedback Problem
Authors: Röbenack Klaus , Voßwinkel Rick
Published: April 2020

This contribution deals with the static output feedback problem of linear time-invariant systems. This is still an area of active research, in contrast to the observer-based state feedback problem, which has been solved decades ago. We consider the formulation and solution of static output feedback design problems using quantifier elimination techniques. Stabilization as well as more specified eigenvalue placement scenarios are the focus of the paper.
Cibercultura y educación ambiental, un ejercicio en la formación de ciudadanos
Authors: Ariza Ariza Leidy Gabriela , Moreno Palomino Jean Sebastian , Robledo Beltran Tania Alexandra
Published: April 2020

Este texto presenta un análisis desde la cibercultura como representación de la educación ambiental en un contexto de jóvenes universitarios, donde su lenguaje y relaciones se desarrollan mediante las redes de comunicación virtual, convirtiéndose en territorios invisibles y visibles donde se articulan saberes con intencionalidades subjetivas y colectivas. Se analizó las relaciones didácticas de la educación ambiental y su diálogo desde las categorías que emergen utilizando la hermenéutica para la formación de ciudadanos. En esta dinámica se analizan las imágenes, textos y videos que circulan entre ellos, que representan su identidad y reconocimiento colectivo, al igual que el significado de las redes virtuales. En esta primera etapa de la investigación se pretende constituir un esquema didáctico de la educación ambiental desde el propio reconocimiento de la virtualidad en la vida del ser y su sociedad.
Predicting Progression in Barrett's Esophagus: Is the Holy Grail Within Reach?
Authors: Qin Yi , Iyer Prasad G.
Published: April 2020

Risk stratification in Barrett's esophagus may allow aggressive management of those at “high risk” and reduction in surveillance in at “low” risk. Davison et al. report the results of the independent validation of a multibiomarker panel (TissueCypher assay) performed on biopsy tissue, in a case control study. “High-risk” patients progressed 5 times more than those at “low risk.” Sensitivity and specificity for “high-risk” patients were 29% and 86% with a positive predictive value of 23%. A negative predictive value of a “low-risk” score was 96%. These findings may allow more intensive surveillance in those at “high risk.” Despite some limitations, this assay is a potentially major advance in the management of Barrett's esophagus patients without dysplasia.
Lenguaje denso y apertura: otra vindicación de la poesía como órgano del conocimiento
Authors: Blanco Ilari Juan Ignacio
Published: April 2020

Este trabajo se enmarca dentro de las innumerables vindicaciones de la poesía. Comienza con el desarrollo de las cuatro características del “lenguaje poético” en tanto “lenguaje denso”. La figuratividad o metaforicidad, su alusividad, la identidad forma-contenido y el realismo poético. En el segundo apartado se analizan estas características a la luz de las categorías de “significatividad” y de “interpretante”. La ontología heideggeriana y la semiótica peirceana enriquecen el concepto de lenguaje denso y aclaran su poder epistémico. Finalmente, analizo algunos aspectos que Nietzsche, en su período retórico (1869-1874), elabora sobre el lenguaje, y que prefiguran y amplían la noción de lenguaje denso. Me centro allí en la idea que todo lenguaje es, en su origen, retórica, y en el modo en que el proceso comunicativo atenta contra dicho origen. Me interesan, en particular, las nociones de “fijación”, “olvido” y “restauración”.
Claves para repensar el mundo circundante. Una expansión de la noción de Werkwelt de M. Heidegger por medio del concepto de “conjunto técnico” de G. Simondon
Authors: Mascaró Luciano
Published: April 2020

Este trabajo se propone mostrar que la noción de mundo circundante técnico [Werkwelt] elaborada por M. Heidegger no logra dar cuenta de la complejidad de la realidad técnica actual puesto que se basa en un modelo artesanal y cuasi-privado de producción. Sugerimos que, de ser consecuentes con las propuestas del mismo Heidegger, y descubrir en el medio técnico a la naturaleza (materia, energía y causalidades) y al mundo público, el Werkwelt debería expandirse hasta coincidir con un entramado pluri-sistémico en una soldadura de zonas funcionales de muy diversa índole, es decir, un conjunto técnico, noción elaborada por G. Simondon
Dios se suicidó. Invitación al exterminio humano en la visión transpersonal de Mainländer
Authors: Sevilla Godínez Héctor
Published: April 2020

El presente artículo aborda algunos de los aspectos centrales de la filosofía propuesta por Philip Mainländer. La intención se enfoca en vislumbrar las implicaciones que suscita el pensamiento de este autor, principalmente en lo tocante a la actitud que se deriva de la contemplación del exterminio de lo humano como una solución consecuente al suicidio y muerte de Dios. Se analiza la intención del hombre en el mundo desde tal perspectiva y se ofrecen vínculos con autores que han acogido para sí los escabrosas y complejos senderos del nihilismo comprometido. El texto termina con una serie de alternativas de redención de lo humano a través de una filosofía sobre la muerte y no en función de la muerte misma.
Julio De Zan contra el realismo moral. Una reconstrucción conceptual de sus proximidades con Christine Korsgaard y Ronald Dworkin
Authors: Lariguet Guillermo
Published: April 2020

En el presente trabajo de homenaje al Profesor Julio De Zan, me concentro en su crítica al realismo moral. En su libro, La ética, los derechos y la justicia, Julio De Zan niega que existan en el ámbito moral propiedades naturales o metafísicas. Para comprender su crítica, propongo una reconstrucción conceptual de los presupuestos filosóficos que existen para su rechazo del realismo moral. Con este propósito, mi propuesta de reconstrucción conceptual consiste en complementar la ética del discurso defendida por Julio De Zan, relacionando su propuesta con dos complementos filosóficos: por un lado, con el rechazo hacia el realismo moral realizado por Ronald Dworkin en su libro Justicia para erizos; por otro lado, con el rechazo hacia el realismo moral dirigido por Christine Korsgaard en su libro Las Fuentes de la Normatividad. Aunque los tres filósofos mantienen diferencias relevantes, mantienen también un rechazo al realismo moral basado en ciertos parecidos de familia.
The crystal structure of 3-((1R,2S)-1-methylpyrrolidin-1-ium-2-yl)pyridin-1-ium tetrachloridozincate(II) monohydrate, C10H18Cl4ZnN2O
Authors: Reiss Guido J. , Sergeeva Alena
Published: April 2020

C10H18Cl4ZnN2O, orthorhombic, P212121 (no. 19), a = 7.0752(1) Å, b = 7.5085(1) Å, c = 29.3383(5) Å, V = 1558.57(4) Å3, Z = 4, R
gt(F) = 0.0330, wR
ref(F
2) = 0.0672, T = 290(2) K.
The crystal structure of 2-(2,3-dimethoxyphenyl)-3-hydroxy-4H-chromen-4-one, C17H14O5
Authors: Koh Dongsoo
Published: April 2020

C17H14O5, monoclinic, P21/c (no. 14), a = 11.7580(7) Å, b = 8.3745(5) Å, c = 13.8754(8) Å, β = 92.622(2)°, V = 1364.84(14) Å3, Z = 4, R
gt(F) = 0.0423, wR
ref(F
2) = 0.1163, T = 223(2) K.
Intrinsic Plasticity of Cerebellar Purkinje Cells Contributes to Motor Memory Consolidation
Authors: Jang Dong Cheol , Shim Hyun Geun , Kim Sang Jeong
Published: April 2020

Intrinsic plasticity of cerebellar Purkinje cells (PCs) has recently been demonstrated in cerebellar local circuits; however, its physiological impact on cerebellar learning and memory remains elusive. Here, we suggest that intrinsic plasticity of PCs is tightly involved in motor memory consolidation based on findings from PC-specific STIM1 knockout male mice, which show severe memory consolidation deficiency in vestibulo-ocular reflex memory. Gain-up training of the vestibulo-ocular reflex produced a decrease in the synaptic weight of PCs in both the WT and KO groups. However, intrinsic plasticity was impaired only in the knockout mice. Furthermore, the observed defects in the intrinsic plasticity of PCs led to the formation of aberrant neural plasticity in the vestibular nucleus neurons. Our results suggest that synergistic modulation of intrinsic and synaptic plasticity in PCs is required for the changes in downstream plasticity in the vestibular nucleus, and thereby contributing to the long-term storage of motor memory.

SIGNIFICANCE STATEMENTSynaptic plasticity is a well-known mechanism for learning and memory. Although plasticity of excitability, intrinsic plasticity, of the cerebellar Purkinje cell has been reported in both directions (potentiation and depression), the physiological role of intrinsic plasticity still remains ambiguous. In this study, we suggest that both synaptic and intrinsic plasticity are required for successful memory consolidation in cerebellar eye movement learning. Despite successful induction and maintenance of synaptic plasticity, we found deficits of memory consolidation when there were defects in intrinsic plasticity. Our results suggest that intrinsic plasticity of cerebellar Purkinje cell has a significant role in motor memory consolidation.
Efectos del método Pilates en la fuerza del cinturón abdomino lumbar en hombres en edad universitaria
Authors: Serrano Santamaría Lina María , García Quintero Diana Patricia , Rodríguez Peña Jaime Orlando , Uscategui Ciendua Alix Johana , Gutiérrez Galvis Adriana , Artunduaga Claros Adrián Maurico
Published: April 2020

El imbalance muscular (IM) es el desequilibrio de la fuerza resistencia, característica que afecta a los diferentes grupos poblacionales, donde el método Pilates mat (PM) con banda elástica (PMB), fue adoptado como estrategia primaria, para prevenir posibles lesiones. Identificar el efecto de entrenamiento de un programa PMB, sobre el IM en la fuerza isométrica en extensión de tronco en hombres universitarios de 18 a 25 años, durante un periodo de 8 semanas, investigación cuantitativa experimental, con hombres en edades de 18 a 25 años, que realizaban menos de 150 minutos de actividad física a la semana, que firmaron consentimiento informado. Se excluyeron a los sujetos que habían practicado alguna de las modalidades de MP, además aquellos que presentaban lesiones, trastornos osteo-musculares, neuromotores, con antecedentes de enfermedad cardiovascular, metabólica, fumadores. La muestra fue de 44 sujetos, 22 GC y 22 GI. Para el análisis de datos, se utilizó el software SPSS versión 24.0. No se encontraron diferencias significativas de p>0,05 en la variable analizada. El MPB no generó cambios significativos entre grupos. La evidencia científica devela, que se debe investigar los efectos del MP, debido a que los estudios realizados no son suficientes para afirmar los beneficios que se le atribuyen.
Mapping of Adaptive Traits Enabled by a High-Density Linkage Map for Lake Trout
Authors: Smith Seth R. , Amish Stephen J. , Bernatchez Louis , Le Luyer Jeremy , Wilson Chris , Boeberitz Olivia , Luikart Gordon , Scribner Kim T.
Published: April 2020

Understanding the genomic basis of adaptative intraspecific phenotypic variation is a central goal in conservation genetics and evolutionary biology. Lake trout (Salvelinus namaycush) are an excellent species for addressing the genetic basis for adaptive variation because they express a striking degree of ecophenotypic variation across their range; however, necessary genomic resources are lacking. Here we utilize recently-developed analytical methods and sequencing technologies to (1) construct a high-density linkage and centromere map for lake trout, (2) identify loci underlying variation in traits that differentiate lake trout ecophenotypes and populations, (3) determine the location of the lake trout sex determination locus, and (4) identify chromosomal homologies between lake trout and other salmonids of varying divergence. The resulting linkage map contains 15,740 single nucleotide polymorphisms (SNPs) mapped to 42 linkage groups, likely representing the 42 lake trout chromosomes. Female and male linkage group lengths ranged from 43.07 to 134.64 centimorgans, and 1.97 to 92.87 centimorgans, respectively. We improved the map by determining coordinates for 41 of 42 centromeres, resulting in a map with 8 metacentric chromosomes and 34 acrocentric or telocentric chromosomes. We use the map to localize the sex determination locus and multiple quantitative trait loci (QTL) associated with intraspecific phenotypic divergence including traits related to growth and body condition, patterns of skin pigmentation, and two composite geomorphometric variables quantifying body shape. Two QTL for the presence of vermiculations and spots mapped with high certainty to an arm of linkage group Sna3, growth related traits mapped to two QTL on linkage groups Sna1 and Sna12, and putative body shape QTL were detected on six separate linkage groups. The sex determination locus was mapped to Sna4 with high confidence. Synteny analysis revealed that lake trout and congener Arctic char (Salvelinus alpinus) are likely differentiated by three or four chromosomal fissions, possibly one chromosomal fusion, and 6 or more large inversions. Combining centromere mapping information with putative inversion coordinates revealed that the majority of detected inversions differentiating lake trout from other salmonids are pericentric and located on acrocentric and telocentric linkage groups. Our results suggest that speciation and adaptive divergence within the genus Salvelinus may have been associated with multiple pericentric inversions occurring primarily on acrocentric and telocentric chromosomes. The linkage map presented here will be a critical resource for advancing conservation oriented genomic research on lake trout and exploring chromosomal evolution within and between salmonid species.
O uso da aprendizagem baseada em problemas para construção do conhecimento na contabilidade
Authors: Urrutia-Heinz Michele , Costa-Quintana Alexandre , Capuano-da Cruz Ana Paula
Published: April 2020

O conhecimento, na visão piagetiana, é visto como um elemento fruto da interação do sujeito com o meio, compreendendo o sujeito como um ser fundamental que participa do processo de construção do seu conhecimento ativamente. De maneira semelhante, a aprendizagem baseada em problemas é uma técnica de ensino que impõe responsabilidade ao aluno no processo de construção do conhecimento. Neste sentido, este estudo buscou verificar como uma metodologia ativa, especificamente a aprendizagem baseada em problemas, pode auxiliar na assimilação do conteúdo, contribuindo com a construção do conhecimento. Para tanto, foi realizada uma pesquisa qualitativa, através de um estudo de caso, com estudantes do 4º semestre de Ciências Contábeis, matriculados na disciplina Estrutura das Demonstrações Contábeis, em uma Instituição de Ensino Superior Federal. A técnica da aprendizagem baseada em problemas foi utilizada no processo de ensino-aprendizagem do conteúdo Demonstração do Valor Adicionado (DVA). Os resultados apontam que de forma geral, o uso da aprendizagem baseada em problemas colabora positivamente para assimilação do conteúdo. Na primeira avaliação realizada, após a aula expositiva seguida de resolução de exercício, constatou-se que 58,62%, dos estudantes assimilaram o conteúdo, e após a aplicação da técnica esta assimilação passou para 95,23%, revelando que o uso desta aprendizagem baseada em problemas é impactante para a construção do conhecimento, além de proporcionar benefícios como trocas de experiências, simulação de uma situação real e desenvolvimento de habilidades como procura de soluções.
Grade 3D Block Modeling and Reserve Estimation of the C-North Iron Skarn Ore Deposit, Sangan, NE Iran
Authors: Ali Rezaei  , Hossein Hassani  , Parviz Moarefvand  , Abbas Golmohammadi
Published: April 2020

Estimation of ore grade is a time and cost consuming process that requires laboratory-based and exploratory information to present the shape and the ore grade distribution of ore deposit in three dimensional space. The block size is one of the most important parameters which impacts the quality of grade estimates in a resource model. This study aims at spatial modeling of iron ore deposit using geostatistical estimation methods such as Ordinary Kriging based on error estimation, selection of the appropriate size for mining blocks using Vlse Kriterijumsk Optimizacija Kompromisno Resenje method, and performing a three-dimensional block modeling along a grade estimation study for the resource estimation in the C-North iron ore deposit, NE Iran. The variogram that was used in OK estimation was cross validated. Cross validation results showed that compared with the local model, OK with the global model was the most appropriate model for the ore body. Detailed distribution maps of total iron contents in the C-North ore deposit showed a close relationship between structural features and higher iron contents, relative to other areas of the ore deposit. Structural features included the major faults and fault zones along the axial plane. These structures are interpreted to have played a significant role in (re) mobilisation and concentration of the metals, in agreement with observations made elsewhere in the Sangan iron ore complex. Based on the estimation results, 83 million tons of resource was estimated at an average grade of 41.86 % Fe using OK method. The C-North ore deposit has been classified based on the relative estimation error variance and the Australasian Code for Reporting of Mineral Resources and Ore Reserves. It is hoped that this example, taken from very different application fields, will encourage practitioners in applying an OK method with variety of ore deposits.
Budaya Media Sosial, Edukasi Masyarakat, dan Pandemi COVID-19
Authors: Sampurno Muchammad Bayu Tejo , Kusumandyoko Tri Cahyo , Islam Muh Ariffudin
Published: April 2020

AbstractThis study wants to explore the public education of COVID-19 through the social and cultural media in it. Furthermore, this research also identifies how the media affect the community and by involving mass media communication in strategies to raise awareness about COVID-19 prevention and prevention efforts. This study uses a qualitative method by utilizing a virtual ethnographic approach that refers to the ethnographic research approach conducted in online settings about the internet and social media. The results show that (1) social media culture in Indonesia can act as a teacher who can educate the public and stimulate in the latest research related to COVID-19; (2) as education for public health services; (3) directing people to their websites and landing pages for information on the latest and most trusted COVID-19; (4) marketing innovative services such as health care social funding services; (5) posts related to case information, photos, and results (with permission) relating to COVID-19 to educate the public; (6) sharing reviews and testimonies of patients who recover as motivation and initial prevention efforts; and (7) providing support among Indonesian citizens in the face of the COVID-19 pandemic.Keywords: Social Media Culture, Public Education, Covid-19 Pandemic AbstrakPenelitian ini ingin mengeksplorasi tentang edukasi masyarakat terhadap COVID-19 melalui media sosial dan budaya yang ada di dalamnya. Lebih lanjut, penelitian ini turut mengidentifikasi bagaimana media mempengaruhi masyarakat dan dengan melibatkan komunikasi media massa  dalam strategi untuk meningkatkan kesadaran tentang usaha penanganan dan pencegahan COVID-19. Penelitian ini menggunakan metode kualitatif dengan memanfaatkan pendekatan virtual etnografi yang mengacu pada pendekatan penelitian etnografi yang dilakukan dalam pengaturan online tentang internet dan media sosial. Hasil penelitian menunjukkan bahwa (1) budaya media sosial di Indonesia dapat bertindak sebagai guru yang mampu mengedukasi masyarakat dan menstimulasi dalam penelitian terbaru terkait COVID-19; (2) sebagai pendidikan layanan kesehatan masyarakat; (3) mengarahkan masyarakat ke situs web dan halaman arahan mereka untuk informasi terkait COVID-19 terbaru dan terpercaya; (4) memasarkan layanan inovatif seperti layanan dana sosial perawatan kesehatan; (5) posting terkait informasi kasus, foto, dan hasil (dengan izin) yang berkaitan dengan COVID-19 untuk mengedukasi masyarakat; (6) berbagi ulasan dan testimoni pasien yang sembuh sebagai motivasi dan upaya awal pencegahan; dan (7) memberikan dukungan antar warga negara Indonesia dalam menghadapi pandemi COVID-19.Kata kunci: Budaya Media Sosial, Edukasi Masyarakat, Pandemi Covid-19
Optimalisasi Upaya Pemerintah Dalam Mengatasi Pandemi Covid 19 Sebagai Bentuk Pemenuhan Hak Warga Negara
Authors: Bima Jati Bima Jati , Putra Gilang Rizki Aji
Published: April 2020

Abstract:Covid-19 or corona virus is a pandemic that is being felt by almost all countries in the world. The impact is not only on the safety aspects of people's lives, but can also be felt on the political economy aspects, especially in third world countries like Indonesia. Not a few efforts made by the central government to date, but have not provided the effectiveness as it should. So it has the potential to erode public trust (public trust) on government performance. The purpose of this paper is to describe the alternatives that the government needs to try to maintain the stability of national and state life. Thus the writer uses Polivocalistic research through a case approach, comparative, historical and critical approach. Therefore, the authors come up with alternatives such as; growing collective awareness, creating state economic stability, developing science and technology and perfecting Indonesia's independence.Keywords: Humanity, Third World Country, Citizens' Rights.                                                      Abstrak:Covid-19 atau virus corona merupakan pandemi yang sedang dirasakan dampaknya oleh hampir seluruh Negara yang ada di Dunia. Dampak tersebut tidak hanya pada aspek keselamatan hidup masyarakat, melainkan dapat dirasakan pada aspek ekonomi politik terutama pada negara dunia ke tiga seperti Indonesia. Tidak sedikit upaya yang dilakukan oleh pemerintah pusat sampai hari ini namun belum memberikan efektivitas sebagaimana mestinya. Sehingga sangat berpotensi merugikan kepercayaan masyarakat (Trust Public) terhadap kinerja pemerintah. Tujuan dari penulisan ini adalah untuk memaparkan alternatif-alternatif yang perlu pemerintah coba lakukan untuk menjaga stabilitas kehidupan berbangsa dan bernegara. Dengan demikian penulis memakai metode penelitian kualitatif dengan pendekatan kepustakaan, historis, dan kritis. Oleh karena itu penulis menggagas alternatif-alternatif seperti : menumbuhkan kesatuan kolektif menciptakan stabilitas ekonomi  negara mengembangkan ilmu pengetahuan dan teknologi serta menyempurnakan kemerdekaan Indonesia.Kata kunci : Kemanusian, Negara Dunia Ketiga, Hak Warga Negara.
The Use of App-based Follow-up of Cardiac Implantable Electronic Devices
Authors: Roberts Paul Richard , ElRefai Mohamed Hassan
Published: April 2020

There has been a steady rise in the number of patients treated with cardiac implantable electrical devices. Remote monitoring and remote follow-up have proven superior to conventional care in the follow-up of these patients and represent the new standard of care. With the widespread availability of smartphones and with more people using them for health queries, app-based remote care offers a promising new digital health solution promoting the shift of follow-up to exception-based assessments. It focuses on patients’ enablement and has shown promising results, but also highlights the need to increase the system’s automaticity to achieve acceptable follow-up adherence rates. MyCareLink Heart is a fully automated app-based system that represents the next generation of app-based monitoring and is currently being evaluated in an international study with promising initial results.
Face validity evaluation of screening tools for gaming disorder: Scope, language, and overpathologizing issues
Authors: King Daniel L. , Billieux Joel , Carragher Natacha , Delfabbro Paul H.
Published: April 2020

Aim

Critics of gaming disorder (GD; i.e., Internet gaming disorder in the DSM-5; Gaming disorder in the ICD-11) have expressed concerns about the potential risks of misclassification (e.g., false positives). An important consideration of relevance to this discussion is the extent to which commonly used screening instruments contain appropriate, sensible, and relevant items. The aim of this review was to evaluate the face validity of items within current tools for GD.

Methods

A systematic review of databases identified 29 instruments. An item bank (n = 417 items) was independently evaluated by three professional raters (i.e., a senior academic in clinical psychology, a senior psychometrician, and an academic/clinical psychologist) according to guidelines for defining and measuring addiction and gaming disorder.

Findings

Evaluation of the item bank identified issues related to: scope (i.e., “scope creep” or items of questionable relevance); language (i.e., confusing language, unusual wording or syntax); and overpathologizing (i.e., pathologizing typical and/or beneficial aspects or consequences of gaming). A total of 71 items across 23 tools had at least one face validity issue.

Conclusions

Most items (83%) demonstrated satisfactory face validity and were consistent with either the DSM-5 or ICD-11 GD classification. However, many tests contain at least one item that may pathologize normal gaming behaviors. Such items refer to basic changes in mood when gaming, a desire to play or continue playing games, and experiencing immersion when gaming. This analysis highlights the challenges of screening for problematic behaviors that are thought to arise within the context of normal recreational activities.