bluuebunny/crossref_metadata_2025 huggingface dataset:
Generating Graphs Packed with Paths Estimation of Linear Approximations and Differentials
Authors: Hall-Andersen Mathias , Vejre Philip S.
Published: November 2020

When designing a new symmetric-key primitive, the designer must show resistance to known attacks. Perhaps most prominent amongst these are linear and differential cryptanalysis. However, it is notoriously difficult to accurately demonstrate e.g. a block cipher’s resistance to these attacks, and thus most designers resort to deriving bounds on the linear correlations and differential probabilities of their design. On the other side of the spectrum, the cryptanalyst is interested in accurately assessing the strength of a linear or differential attack.While several tools have been developed to search for optimal linear and differential trails, e.g. MILP and SAT based methods, only few approaches specifically try to find as many trails of a single approximation or differential as possible. This can result in an overestimate of a cipher’s resistance to linear and differential attacks, as was for example the case for PRESENT.In this work, we present a new algorithm for linear and differential trail search. The algorithm represents the problem of estimating approximations and differentials as the problem of finding many long paths through a multistage graph. We demonstrate that this approach allows us to find a very large number of good trails for each approximation or differential. Moreover, we show how the algorithm can be used to efficiently estimate the key dependent correlation distribution of a linear approximation, facilitating advanced linear attacks. We apply the algorithm to 17 different ciphers, and present new and improved results on several of these.
Vectorized linear approximations for attacks on SNOW 3G
Authors: Yang Jing , Johansson Thomas , Maximov Alexander
Published: November 2020

SNOW 3G is a stream cipher designed in 2006 by ETSI/SAGE, serving in 3GPP as one of the standard algorithms for data confidentiality and integrity protection. It is also included in the 4G LTE standard. In this paper we derive vectorized linear approximations of the finite state machine in SNOW3G. In particular,we show one 24-bit approximation with a bias around 2−37 and one byte-oriented approximation with a bias around 2−40. We then use the approximations to launch attacks on SNOW 3G. The first approximation is used in a distinguishing attack resulting in an expected complexity of 2172 and the second one can be used in a standard fast correlation attack resulting in key recovery in an expected complexity of 2177. If the key length in SNOW 3G would be increased to 256 bits, the results show that there are then academic attacks on such a version faster than the exhaustive key search.
Low AND Depth and Efficient Inverses: a Guide on S-boxes for Low-latency Masking
Authors: Bilgin Begül , De Meyer Lauren , Duval Sébastien , Levi Itamar , Standaert François-Xavier
Published: November 2020

In this work, we perform an extensive investigation and construct a portfolio of S-boxes suitable for secure lightweight implementations, which aligns well with the ongoing NIST Lightweight Cryptography competition. In particular, we target good functional properties on the one hand and efficient implementations in terms of AND depth and AND gate complexity on the other. Moreover, we also consider the implementation of the inverse S-box and the possibility for it to share resources with the forward S-box. We take our exploration beyond the conventional small (and even) S-box sizes. Our investigation is twofold: (1) we note that implementations of existing S-boxes are not optimized for the criteria which define masking complexity (AND depth and AND gate complexity) and improve a tool published at FSE 2016 by Stoffelen in order to fill this gap. (2) We search for new S-box designs which take these implementation properties into account from the start. We perform a systematic search based on the properties of not only the S-box but also its inverse as well as an exploration of larger S-box sizes using length-doubling structures. The result of our investigation is not only a wide selection of very good S-boxes, but we also provide complete descriptions of their circuits, enabling their integration into future work.
Pyjamask: Block Cipher and Authenticated Encryption with Highly Efficient Masked Implementation
Authors: Goudarzi Dahmun , Jean Jérémy , Kölbl Stefan , Peyrin Thomas , Rivain Matthieu , Sasaki Yu , Sim Siang Meng
Published: November 2020

This paper introduces Pyjamask, a new block cipher family and authenticated encryption proposal submitted to the NIST lightweight cryptography standardization process. Pyjamask targets side-channel resistance as one of its main goal. More precisely, it strongly minimizes the number of nonlinear gates used in its internal primitive in order to allow efficient masked implementations, especially for high-order masking in software. Compared to other block ciphers, our proposal has thus among the smallest number of binary AND computations per input bit at the time of writing. Even though Pyjamask minimizes such an important criterion, it remains rather lightweight and efficient, thanks to a general bitslice construction that enables to computation of all nonlinear gates in parallel. For authenticated encryption, we adopt the provably secure AEAD mode OCB which has been extensively studied and has the benefit to offer full parallelization. Of course, other block cipher-based modes can be considered as well if other performance profiles are to be targeted.The paper first gives the specification of the Pyjamask block cipher and the associated AEAD proposal. We also provide a detailed design rationale for the block cipher which is guided by our aim of software efficiency in the presence of high-order masking. The security of the design is analyzed against most commonly known cryptanalysis techniques. We finally describe efficient (masked) implementations in software and provide implementation results with aggressive performances for masking of very high orders (up to 128). We also provide a rough estimation of the hardware performances which remain much better than those of an AES round-based implementation.
Modelo de adopción técnológica para el uso de la nube computacional en las pymes del sector exportador de camarón
Authors: Cifuentes moreira Wimper Fernando , Townsend Valencia José Enrique
Published: November 2020

El estudio de modelos teóricos de aceptación tecnológica es relevante al momento de evaluar el grado de adopción de nuevos procesos en la nube computacional. Los cambios tecnológicos se centran en los inconvenientes de aceptación por parte de las pymes debido a que implican una inversión economica para poder competir en el mercado. El objetivo de esta investigación fue evaluar la relación de la adopción con las variables de estudio las cuales son la ventaja relativa, los competidores, la compatibilidad y el apoyo de alta gerencia estableciendo como marco de referencía el modelo de tecnología para las pymes del sector exportadore de camarón en el cantón Durán. La investigación posee un estudio descriptivo y correlativo en el cantón Durán. La investigación posee un estudio descriptivo y correlativo que permitió identificar los factores que inciden en la adopción de la nube computacional. El enfoque de la investigación es de tipo mixto debido a que los datos cualitativos se obtuvieron de fuentes documentales y revisiones bibliograficas y sus datos cuantitativos de estudios previos y estadisticos. El resultado de la investigación permitió conocer el estado actual de las pymes del sector exportador de camarón identificando relaciones en las variables apoyo de alta gerencia con el conocimiento de la organización y la infraestructura con el ahorro de cosotos.
El empleo de las TIC en la educación superior, una mirada desde la neurociencia educacional
Authors: Cano Niurys González , Monzón Hernán Hernández , González Cano Yasleidy
Published: November 2020

Las nuevas tecnologías han impuesto cambios significativos en los sistemas educativos, particularmente en la educación superior, donde las nuevas tendencias incluyen el auge extraordinario de las TIC para promover la integración de conocimientos y saberes, el desarrollo de habilidades y el fortalecimiento de valores, donde la neurociencia educacional puede hacer grandes contribuciones. El presente trabajo se propone abordar el proceso de enseñanza y aprendizaje en la educación superior, influenciado por las TIC, con un enfoque basado en neurociencia educacional. El empleo de estas herramientas fomenta el desarrollo de habilidades y competencias en los estudiantes y promueven la capacidad creativa e innovadora de los docentes. La comprensión de las bases neurofisiológicas sobre las que se construye el conocimiento y cómo éste se produce, la socialización, el entorno, la motivación, y otras cuestiones inherentes al aprendizaje del estudiante, constituyen aportes de la neurociencia educacional al perfeccionamiento del proceso docente en las universidades.
Modelo de Gestión de la Innovación para mejorar la efectividad en el lanzamiento de nuevos productos en Fundación Malecón 2000
Authors: Martillo Calderón Wellington Armando , Rodríguez Otto Suárez
Published: November 2020

En la actualidad, la administración de la innovación representa un aspecto muy importante en las organizaciones a nivel mundial, pero es necesario que se adopte un enfoque estratégico porque la innovación en sí misma no es suficiente para alcanzar el éxito. En este trabajo se estableció el objetivo de elaborar un modelo de gestión de la innovación aplicable a Fundación Malecón 2000 de la ciudad de Guayaquil, con un enfoque estratégico, para mejorar la efectividad en el lanzamiento de nuevos productos. Se aplicaron sendas encuestas a una muestra de visitantes del Malecón 2000 y a los empleados de la Fundación. Uno de los principales resultados obtenido de los visitantes fue la buena predisposición a aportar con ideas de nuevos productos y por parte de los empleados se determinó que es limitado el aporte de los colaboradores al no estar integrados en el proceso de innovación de la organización. La Fundación Malecón 2000 tiene la oportunidad de adoptar un modelo de gestión alineado al modelo Stage-Gate, que incorpore conceptos relevantes de la innovación como la cadena de valor, el clima organizacional, el Modelo de Innovación Abierta y la gestión de riesgos en la innovación, para lograr la satisfacción plena de los visitantes, así como el retorno satisfactorio de la inversión.
A ontologia da operatividade na obra de Giorgio Agamben
Authors: Nascimento Daniel Arruda
Published: November 2020

Revistando o livro Opus Dei: archeologia dell’ufficio de Giorgio Agamben, publicado em 2012, pretendo nas páginas que se seguem expor em nova luz a crítica da ontologia da operatividade e da efetividade proposta pelo filósofo italiano. Se em Il regno e la gloria: per una genealogia teologica dell’economia e del governo, publicado em 2007, se tratava de investigar a inoperosidade divina e humana como elemento constitutivo da nossa cultura governamental, cabe agora introduzir os disparadores que permitirão a crítica à operatividade. Como veremos, o seu pensamento está assim alinhado a uma fileira de críticos da ontologia que inclui autores de diferentes matizes, todos incomodados com que se poderia chamar de alienação ontológica. Considero que, na sua acepção contemporânea, essa linha se estende de Søren Kierkegaard a Hannah Arendt, passando evidentemente por Martin Heidegger. Ao final, veremos como o reconhecimento do triunfo do agir e do fazer sobre o âmbito do ser, do triunfo do ato sobre a potência, influi sobre a política contemporânea. L’uso dei corpi, publicado em 2014, nos auxiliará nesse caminho.
Desculpados pela ignorância?
Authors: Abath André Joffliy
Published: November 2020

Em seu “Unsafe Reasoning: A Survey” (2009), Paulo Faria mostra que é uma conseqüência do externismo semântico que os sujeitos imaginados em experimentos mentais—como os imaginados por Burge (1988), que passam por comutação lenta entre a Terra e a Terra-Gêmea—são desculpados por sua ignorância semântica, que pode levá-los a falácias de equivocação. Porém, segundo Faria, frequentemente, em cenários mundanos, nossa ignorância não será desculpável, e seu artigo é, em parte, um chamado para que a discussão da ignorância seja pautada por cenários mundanos, e não por experimentos mentais. Meu propósito, neste artigo, é atender o chamado de Faria e discutir quando, em cenários mundanos, estaremos desculpados ou não em nossa ignorância.
Desconstrução e heterodoxia linguística em Jacques Derrida
Authors: Gomes Tiago de Fraga
Published: November 2020

O presente texto, partindo das ideias de Derrida, pretende levantar um questionamento a respeito da repressão filosófica logocêntrica que quer classificar tudo como voz ativa e voz passiva. A différance derridiana, como diferenciação aberta e imprevisível, não se enquadra nos moldes gramatológicos ortodoxos, denotando uma voz intermediária, prenhe de potência, de possibilidades e de uma anarquia improvisadora. Derrida questiona o status do conhecimento pela desconstrução da escritura, interpelando a própria ordem conceitual, porém, não impondo limites à interpretação textual, mas utilizando-se de conceitos indecidíveis, com o intuito de não colocar uma camisa de força aniquiladora da potência linguística e filosófica.
The obscure content of hallucination
Authors: Alves Marco Aurélio Sousa
Published: November 2020

Michael Tye (2009) proposed a way of understanding the content of hallucinatory experiences. Somewhat independently, Mark Johnston (2004) provided us with elements to think about the content of hallucination. In this paper, their views are compared and evaluated. Both their theories present intricate combinations of conjunctivist and disjunctivist strategies to account for perceptual content. An alternative view (called “the epistemic conception of hallucination”), which develops a radically disjunctivist account, is considered and rejected. Finally, the paper raises some metaphysical difficulties that seem to threaten any conjunctivist theory and to lead the debate to a dilemma: strong disjunctivists cannot explain the subjective indistinguishability between veridical and hallucinatory experiences, whereas conjunctivists cannot explain what veridical and hallucinatory experiences have in common. This dilemma is left here as an open challenge.
Os limites da linguagem e do místico: assimilação do pensamento schopenhaueriano por Wittgenstein
Authors: Picoli Gleisy
Published: November 2020

O objetivo primordial deste artigo consiste em analisar a assimilação do pensamento schopenhaueriano por Wittgenstein, no que diz respeito à relação entre a linguagem e o místico. No decorrer do texto, pretendemos evidenciar que a tão conhecida posição wittgensteiniana de que sobre o místico não se fala, na verdade, tem como base a doutrina schopenhaueriana da linguagem, cujos limites linguísticos são alcançados na negação da vontade, momento em que se abre uma passagem ao místico. De nossa interpretação se seguirá como consequência principal que a problemática central do Tractatus entre o dizer e o mostrar, comumente considerada característica distinta da filosofia de Wittgenstein, já pode ser lida no sistema de seu predecessor.
Evidências de dialeticidade no pensamento de Goethe
Authors: Coelho Humberto Schubert
Published: November 2020

Este trabalho trata da peculiar dialética de Goethe. Como um declarado “não filósofo" que, não obstante, tem uma filosofia, Goethe jamais formalizou os fundamentos de seu pensamento. A importância capital de sua obra no desenvolvimento da metafísica da subjetividade, tanto através do Idealismo quanto do Romantismo, no entanto, fazem da filosofia subjacente a esta obra um ponto de inflexão do pensamento contemporâneo. Ainda que o neoplatonismo de Goethe seja bastante obvio, é possível argumentar que este elemento neoplatônico de seu pensar dinâmico e algo vago possa, ao final, estar subjugado a, por exemplo, Espinosa, a algum helenismo ou uma concepção empirista. Defenderei, portanto, que uma dialeticidade de fundo é um traço central e inconfundível, ainda que talvez discreto, na integração da visão de mundo de Goethe
Patriotismo: entre a Filosofia do Direito de Hegel e a Revolução Francesa
Authors: Baker Valls Pereira Eduardo
Published: November 2020

O presente artigo discute o conceito de patriotismo em Hegel, principalmente a partir da obra Linhas Fundamentais da Filosofia do Direito, e sua interface com as diferentes concepções de patriotismo que circulavam durante a Revolução Francesa, com especial atenção para o período dos debates constituintes do Ano I. Mostra-se como o conceito de patriotismo pode ser utilizado como chave de leitura para o papel do Estado na filosofia política hegeliana e como ele ilumina a relação entre indivíduo e vida ética na obra hegeliana. O recurso à Revolução Francesa visa mostrar a proximidade entre a concepção hegeliana e um certo patriotismo revolucionário, ao mesmo tempo que mostra como esse último pode nos ajudar a operacionalização do patriotismo de Hegel em um contexto historicamente situado.
A intencionalidade na perspectiva histórico-existencial
Authors: Mac Dowell João A.
Published: November 2020

Resumo:

O artigo apresenta a concepção heideggeriana de intencionalidade, à luz da compreensão da transcendência do aí-ser (Dasein) como ser-no-mundo em Ser e tempo. Insiste em que tal concepção só pode ser bem apreendida a partir da intuição fundamental do filósofo sobre o sentido de ser do aí-ser e consequentemente do ser como tal.  Trata-se da abordagem do ser-humano como vida fáctica ou existência histórica em contraposição a todo o pensamento metafísico com suas distinções sensível/inteligível e sujeito/objeto.

Palavras-chave: sentido de ser; pensar fenomenológico-hermenêutico; metafísica; existência histórica; intencionalidade; transcendência

 

Abstract:

The article presents the Heideggerian view of intentionality, in the light of the Dasein`s transcendence as Being-in-the-world in Being and Time. It stresses that such a view can only be well grasped from Heidegger`s fundamental insight into the meaning of Dasein`s Being and hence of Being as such. This insight implies the approach of human being as factical life or historical existence in opposition to all metaphysical thinking with its sensible/intelligible and subject/object distinctions.

Key-words: Meaning of Being; phenomenological-hermeneutic thinking; metaphysics; historical existence; intentionality; transcendence
Digitális jegybankpénz Kínában – a régóta várt áttörés?
Authors: Goreczky Péter
Published: November 2020

Az elmúlt évtizedben Kína számos kezdeményezést indított, hogy növelje fizetőeszköze súlyát a nemzetközi gazdasági életben. A kínai vezetés erőfeszítései ellenére ugyanakkor az amerikai dollár maradt az uralkodó tartalékvaluta, és a nemzetközi tranzakciókban sem nőtt számottevően a jüan aránya. A két ország romló kapcsolata miatt Kína számára egyre nagyobb kockázatot jelent a dollár alapú nemzetközi fizetési és elszámolási rendszertől való függés. A digitális jegybankpénz bevezetésétől sokan azt várják, hogy felgyorsul a kínai valuta nemzetközi térnyerése, és csökken a dollár globális dominanciája. A vele szoros gazdasági és turisztikai kapcsolatban álló országokban Kína várhatóan sikeresen tesztelheti majd a digitális jüan nemzetközi használatát. Ugyanakkor a dollár globális tartalékvalutaként betöltött pozícióját a digitális jüan bevezetése önmagában nem fogja megingatni, és a nemzetközi pénzügyi tranzakciókban is akkor fog növekedni számottevően a súlya, ha az ország vezetése folytatja a pénzpiacok reformját és teljes mértékben megszünteti a tőkeáramlásokat érintő korlátozásokat.
Effects of Ilias Online Learning Platform on Academic Achievement in Educational Technology among University Students’ in Nigeria
Authors: Omotayo Alabi Thomas , Hellen Thaddeus , Caleb Falode Oluwole , Joshua Chukwuemeka Emeka
Published: November 2020

This study investigated the effects of ILIAS online learning platform on students’ achievement in educational technology among universities in Nigeria. Quasi-experimental research design was adopted and 338 participants (157 males and 181 females) year two students constituted the sample for the study. The research was guided by two research questions and two null hypotheses. A researchers designed instrument named Educational Technology Achievement Test (ETAT) was used for data collection. Data collected was analysed using mean and standard deviation while ANOVA was used to test the two null hypotheses that were formulated. The findings of the study indicated that those taught with ILIAS learning platform had higher mean achievement scores in ETAT than those students in the control group and also there was no significant difference in the mean achievement scores of male and female students taught Educational Technology using ILIAS learning platform. Based on the findings of the study, it was recommended that Universities and other tertiary institutions should implement the use of ILIAS learning platform in teaching and learning process for the purpose of enhancing learning outcome.
Typomorphic gold features as criteria of placer association with primary gold-silver-type sources (example from Mnogovershinnoye ore placer cluster)
Authors: Migachev Igor , Minina Olga , Zvezdov Vadim
Published: November 2020

A comprehensive study of native gold from Mnogovershinnoye gold cluster ores and placers (granulometry, crystal morphology, internal structure, nature of exogenetic transformations, fineness and trace element composition) was performed to define placer association with primary sources. Using ICP-MS method and X-ray spectrographic analysis, new data on geochemical gold features was obtained, which expands and clarifies the evidence of gold typomorphism from a gold-silver deposit primary source and its association with placers.
On Gauss and Kloosterman sums
Authors:   Institute for Applied Mathematics, Far Eastern Branch, Russian Academy of Sciences, Vladivostok, Russia, Avdeeva M.O. , Gorbatuk N.V. ,   Institute for Applied Mathematics, Far Eastern Branch, Russian Academy of Sciences, Vladivostok, Russia, Shulga N.A. ,   Institute for Applied Mathematics, Far Eastern Branch, Russian Academy of Sciences, Vladivostok, Russia
Published: November 2020

In this paper we calculate averages by parameters of Kloosterman sums, which include Dirichlet characters. They appear when constructing arithmetic trace formulas in the theory of automorphic forms.
Efeito bactericida da alta frequência no Staphylococcus aureus
Authors: Formenton Laís , Ribeiro de Souza Cristiane , Silveira Barsotti Nathália
Published: November 2020

É visto que na estética o alta-frequência é um recurso que pode colaborar no tratamento de várias disfunções estéticas, devido ao seu baixo custo e sua ação de produção de ozônio, considerada uma das substâncias de maior efetividade bactericida. Porém, há poucos estudos que mostram a eficácia do alta-frequência no tratamento da foliculite e que descrevem a forma mais adequada de aplicação deste equipamento. Este trabalho visou verificar a ação do alta-frequência in vitro, com diferentes tempos e eletrodos, demostrando que a ação bactericida do alta-frequência está mais ligada à forma de aplicação, formando faíscas, do que ao tempo de contato do eletrodo com o microorganismo.
Impacto de la suplementación con colágeno hidrolizado en mujeres fumadoras
Authors: Da Silveira Gonçalves Juliana , Yuri Suzuki Vanessa , Abrahão Felipe , Carvalho Jamil Liliane , Deutsch Gabriela , Rocha Oliveira Carlos , Masako Ferreira Lydia
Published: November 2020

Introducción: Por ser el rostro de la parte del organismo más expuesta y que sufre el proceso de envejecimiento prematuro, merece atención y prácticas que preserven su belleza. Objetivo: Analizar los beneficios de la suplementación con colágeno hidrolizado en la piel de mujeres fumadoras (n = 7). Métodos: Se complementó diariamente, durante 90 días, 10 mg de colágeno hidrolizado en polvo, que contiene 45 mg de vitamina C, 17 mcg de selenio, 3,5 mg de zinc y 9 g de colágeno hidrolizado. Se registró, a través de fotografías tomadas por un dermatólogo, el rostro de las mujeres antes y al final del tratamiento, para que a través de este se pudiera realizar la valoración cutánea por parte del médico. Se evaluó la textura, hidratación, arrugas, manchas y brillo de la piel. Resultados y Discusión: Las manchas y arrugas mostraron poca o ninguna mejoría, la hidratación y textura variaron entre mejoría y muy buena mejoría y el brillo tuvo el mejor resultado, con muy buena mejoría en todos los participantes. Conclusión: La suplementación de colágeno hidrolizado es beneficiosa para algunas características más superficiales de la piel, sin reducir el efecto de arrugas e imperfecciones. Sin embargo, se recomienda la suplementación ya que el colágeno es una sustancia natural en el cuerpo, que se degrada a lo largo de la vida, y esta degradación se acelera al fumar.
Todas as diferenças cabem no mundo, inclusive, professores homens na educação infantil
Authors: Santos Sandro Vinicius Sales dos , Ramos Joaquim
Published: November 2020

Não se aplica
O homem-professor na Educação Infantil e a produção da profissionalidade
Authors: Bello Alexandre Toaldo , Zanette Jaime Eduardo , Felipe Jane
Published: November 2020

Neste artigo, a partir da proposição de uma lei que limita a atuação de homens na Educação Infantil no Estado de São Paulo, problematizamos a figura do homem-professor nesta etapa da educação. Sustentados nos Estudos de Gênero, de vertente pós-estruturalista, nos cabe considerar que nossas instituições educativas são atravessadas por scripts de gênero que dimensionam nosso olhar e conduzem a conduta dos sujeitos. Este texto foi produzido através do diálogo entre duas pesquisas produzidas em momentos distintos (BELLO, 2006; ZANETTE, 2018), mas que tinham como corpus a primeira etapa da Educação básica. As metodologias utilizadas foram a observação participante em uma turma da Educação Infantil e grupos focais com docentes, respectivamente. Depreendeu-se deste diálogo que o estranhamento da presença do homem-professor na Educação Infantil é ratificado pelo pânico moral que vêm se produzindo ao longo do tempo. Pânico este que traduz o sujeito masculino como portador de uma sexualidade incontrolável, consequentemente, perigosa. Contudo, percebe-se que estes obstáculos podem ser encarados como elementos que contribuem para a constituição de uma profissionalidade masculina que atua junto a diferentes instituições com crianças.
Experiências de pesquisa de um corpo masculino adulto numa instituição de Educação Infantil
Authors: Campos Tulio , Gouvêa Maria Cristina Soares , Debortoli José Alfredo Oliveira
Published: November 2020

Este texto tem como objetivo refletir sobre as relações que envolveram a presença de um pesquisador homem em uma instituição pública de Educação Infantil. Fruto de um estudo que buscou compreender as experiências de crianças e adultos pelos/nos espaços da cidade de Belo Horizonte, em especial praças, parques, mercados e museus por meio de excursões, teve como principal aporte teórico-metodológico a pesquisa etnográfica em conjunto com a pesquisa colaborativa. Durante a estadia no campo, o pesquisador viu-se desafiado a construir conjuntamente com as crianças e a professora relações de pesquisa mais colaborativas e relacionais, buscando analisar como a identidade de gênero do pesquisador, expressa em sua corporeidade, informou a relação com as crianças e professora durante a realização da pesquisa.
Efeitos da agilidade organizacional no comprometimento organizacional: o papel mediador do empowerment psicológico
Authors: Monteiro Januário José , Santos Edicreia Andrade dos , Lunkes Rogério João , Schnorrenberger Darci
Published: November 2020

Este estudo tem como objetivo examinar o efeito da agilidade organizacional no comprometimento organizacional mediado pelo empowerment psicológico. A pesquisa foi desenvolvida a partir de um questionário que levantou a percepção de 87 funcionários de um Hospital com atendimento de excelência a emergências cardiológicas de Florianópolis/SC. Foram testadas três hipóteses e os dados foram analisados a partir da técnica Equações Estruturais. Dentre os achados confirmou-se que há relação positiva significante entre a agilidade e o comprometimento organizacional, além de que o empowerment psicológico está diretamente relacionado com o comprometimento organizacional, e também medeia positivamente a relação entre a agilidade organizacional e o comprometimento. Infere-se que os funcionários percebem que sua organização é ágil, quando essa adota políticas que a permitem adaptar-se às mudanças no ambiente organizacional. Essa percepção aumenta o empowerment psicológico dos funcionários e consequentemente afeta o sentimento de apego com a organização.
Usos/desusos/abusos de termos sobre mobilidade internacional e trabalho: diálogos possíveis entre administração e antropologia
Authors: Scherer Laura Alves , Prestes Vanessa Amaral , Grisci Carmem Ligia Iochins
Published: November 2020

Este artigo teórico tem como objetivos discutir acerca dos principais termos e conceitos relativos à associação “mobilidade internacional e trabalho”, presentes na Administração e na Antropologia; e argumentar a favor do incremento do diálogo entre as áreas em prol do enriquecimento teórico-empírico relativo ao tema. Dentre os termos estudados estão expatriado, autoexpatriado, flexpatriado e gestores globais, na Administração; e imigrante, diáspora, transnacional e refugiado, na Antropologia. Cada área faz um recorte específico, o que pode promover classificações reducionistas da pluralidade da vida e mostrar-se tarefa inócua ao avanço do conhecimento, haja vista a velocidade das mudanças nas relações entre países, nas motivações de deslocamento mundial e nas configurações de trabalho. Argumenta-se a favor de que o ponto em comum aos indivíduos que atravessam fronteiras remeta ao vocábulo migração – todos são migrantes, emigrantes e imigrantes – pelo qual o diálogo poderá ilustrar a dimensão diversa de vida e trabalho destes indivíduos.
The right of petition and the typological forms of petition in Mexico's tax matter
Authors: González Sanmiguel Nancy Nelly , Ramírez Chavez Xochitl Alicia , Cepeda Rincón Francisco de Jesús
Published: November 2020

The following paper analyzes one of the most important freedoms in any nation that deigns to be a Rule of Law: The Right of Petition. Considered as a subjective right of a public nature, it will be analyzed through the main legal norms that regulate it in Mexico, as well as the response time and the agreements due to notification that the authority must issue to complete and fully respect the exercise of this right.
Magnetic resonance imaging of the hip: anatomy and pathology
Authors: Mak May San , Teh James
Published: November 2020

The aim of this review is to outline the normal anatomy of the hip and to discuss common painful conditions of the hip that affect the general adult population. Hip pain is a common complaint with many different etiologies. In this review, hip pathologies are divided by location into osseous, intra-articular and extra-articular lesions. Magnetic resonance imaging (MRI) is the modality of choice for investigating painful hip conditions due to its multiplanar capability and high contrast resolution. This review focuses on the characteristic MRI features of common traumatic and pathologic conditions of the hip.
Trends in global tropospheric hydroxyl radical and methane lifetime since 1850 from AerChemMIP
Authors: Stevenson David S. , Zhao Alcide , Naik Vaishali , O'Connor Fiona M. , Tilmes Simone , Zeng Guang , Murray Lee T. , Collins William J. , Griffiths Paul T. , Shim Sungbo , Horowitz Larry W. , Sentman Lori T. , Emmons Louisa
Published: November 2020

Abstract. We analyse historical (1850–2014) atmospheric hydroxyl
(OH) and methane lifetime data from Coupled Model Intercomparison Project
Phase 6 (CMIP6)/Aerosols and Chemistry Model Intercomparison Project
(AerChemMIP) simulations. Tropospheric OH changed little from 1850 up to
around 1980, then increased by around 9 % up to 2014, with an associated
reduction in methane lifetime. The model-derived OH trends from 1980 to 2005
are broadly consistent with trends estimated by several studies that infer
OH from inversions of methyl chloroform and associated measurements; most
inversion studies indicate decreases in OH since 2005. However, the model
results fall within observational uncertainty ranges. The upward trend in
modelled OH since 1980 was mainly driven by changes in anthropogenic
near-term climate forcer emissions (increases in anthropogenic nitrogen
oxides and decreases in CO). Increases in halocarbon emissions since 1950
have made a small contribution to the increase in OH, whilst increases in
aerosol-related emissions have slightly reduced OH. Halocarbon emissions
have dramatically reduced the stratospheric methane lifetime by about
15 %–40 %; most previous studies assumed a fixed stratospheric lifetime.
Whilst the main driver of atmospheric methane increases since 1850 is
emissions of methane itself, increased ozone precursor emissions have
significantly modulated (in general reduced) methane trends. Halocarbon and
aerosol emissions are found to have relatively small contributions to
methane trends. These experiments do not isolate the effects of climate
change on OH and methane evolution; however, we calculate residual terms that
are due to the combined effects of climate change and non-linear
interactions between drivers. These residual terms indicate that non-linear
interactions are important and differ between the two methodologies we use
for quantifying OH and methane drivers. All these factors need to be
considered in order to fully explain OH and methane trends since 1850; these
factors will also be important for future trends.
Global peatland area and carbon dynamics from the Last Glacial Maximum to the present – a process-based model investigation
Authors: Müller Jurek , Joos Fortunat
Published: November 2020

Abstract. Peatlands are an essential part of the terrestrial carbon cycle and the climate system. Understanding their history is key to understanding future and past land–atmosphere carbon fluxes.
We performed transient simulations over the last 22 000 years with a dynamic global peat and vegetation model forced by Earth system model climate output, thereby complementing data-based reconstructions for peatlands.
Our novel results demonstrate a highly dynamic evolution with concomitant gains and losses of active peatland areas. Modeled gross area changes exceed net changes several fold, while net peat area increases by 60 % over the deglaciation.
Peatlands expand to higher northern latitudes in response to warmer and wetter conditions and retreating ice sheets, and they are partly lost in midlatitude regions.
In the tropics, peatlands are partly lost due to the flooding of continental shelves and are regained through nonlinear responses to the combined changes in temperature, precipitation, and CO2.
Large north–south shifts of tropical peatlands are driven by shifts in the position of the intertropical convergence zone associated with the abrupt climate events of the glacial termination.
Time slice simulations for the Last Glacial Maximum (LGM) demonstrate large uncertainties in modeled peatland extent (global range from 1.5 to 3.4 Mkm2, million square kilometers) stemming from uncertainties in climate forcing.
The net uptake of atmospheric CO2 by peatlands, modeled at 351 GtC since the LGM, considers decay from former peatlands.
Carbon uptake would be misestimated, in particular during periods of rapid climate change and subsequent shifts in peatland distribution, when considering only changes in the area of currently active peatlands. Our study highlights the dynamic nature of peatland distribution and calls for an improved understanding of former peatlands to better constrain peat carbon sources and sinks.
Stability evaluation and potential failure process of rock slopes characterized by non-persistent fractures
Authors: Zhang Wen , Wang Jia , Xu Peihua , Lou Junqing , Shan Bo , Wang Fengyan , Cao Chen , Chen Xiaoxue , Que Jinsheng
Published: November 2020

Abstract. Slope failure, which causes destructive damage and
fatalities, is extremely common in mountainous areas. Therefore, the
stability and potential failure of slopes must be analysed accurately. For
most fractured rock slopes, the complexity and random distribution of
structural fractures make the aforementioned analyses considerably
challenging for engineers and geologists worldwide. This study aims to solve
this problem by proposing a comprehensive approach that combines the
discrete fracture network (DFN) modelling technique, the synthetic rock mass
(SRM) approach, and statistical analysis. Specifically, a real fractured
rock slope in Laohuding Quarry in Jixian County, China, is studied to show this
comprehensive approach. DFN simulation is performed to generate
non-persistent fractures in the cross section of the slope. Subsequently, the
SRM approach is applied to simulate the slope model using 2D particle flow
code software (PFC2D). A stability analysis is carried out based on the
improved gravity increase method, emphasizing the effect of stress
concentration throughout the formation of the critical slip surface. The
collapse, rotation, and fragmentation of blocks and the accumulation
distances are evaluated in the potential failure process of the rock slope.
A total of 100 slope models generated with different DFN models are used to repeat the
aforementioned analyses as a result of a high degree of variability in DFN
simulation. The critical slip surface, factor of safety, and accumulation
distance are selected by statistical analysis for safety assurance in slope
analysis and support.
The influence of urban form and socio-demographics on active transport: A 40-neighborhoods study in Chengdu, China
Authors: Guan ChengHe , Forsyth Ann
Published: November 2020

In China, a centralized planning culture has created similar neighborhoods across the country. Using a survey of 1,048 individuals conducted in 2016 in Chengdu—located in a carefully conceptualized typology of neighborhood forms—we analyzed the associations between individual and neighborhood characteristics and active or nonmotorized transport behavior. Using several multiple logistic and multilevel models, we show how neighborhoods were categorized and how the number of categories or neighborhood types affected the magnitude of the associations with active transport but not the direction. People taking non-work trips were more likely to use active compared with motorized modes in all neighborhood types. Neighborhood type was significant in models but so too were many other individual-level variables and infrastructural and locational features such as bike lanes and location near the river. Of the 3-D physical environment variables, floor area ratio (a proxy for density) was only significant in one model for nonwork trips. Intersection density and dissimilarity (land-use diversity) were only significant in a model for work trips. This study shows that to develop strong theories about the connections between active transport and environments, it is important to examine different physical and cultural contexts and perform sensitivity analyses. Research in different parts of China can help provide a more substantial base for evidence-informed policymaking. Planning and design recommendations were made related to active transport need to consider how neighborhoods, built environments, and personal characteristics interact in different kinds of urban environments.
High mucosal cytomegalovirus DNA helps predict adverse short-term outcome in acute severe ulcerative colitis
Authors: Jain Saransh , Namdeo Divya , Sahu Pabitra , Kedia Saurabh , Sahni Peush , Das Prasenjit , Sharma Raju , Gupta Vipin , Makharia Govind , Dar Lalit , Travis Simon PL , Ahuja Vineet
Published: November 2020

Background/Aims: Predictors of short-term outcome of intravenous (IV) steroid therapy in acute severe ulcerative colitis (ASUC) have been well described, but the impact of cytomegalovirus (CMV) infection as a predictor of outcome remains debatable. We investigated the role of quantitative CMV polymerase chain reaction (PCR) as a predictor of short-term outcome in patients with ASUC.Methods: Consecutive patients with ASUC satisfying Truelove and Witts criteria hospitalized at All India Institute of Medical Sciences (AIIMS) from May 2016 to July 2019 were included; all received IV steroid. The primary outcome measure was steroid-failure defined as the need for rescue therapy (with ciclosporin or infliximab) or colectomy during admission. AIIMS’ index (ulcerative colitis index of severity > 6 at day 1+fecal calprotectin > 1,000 μg/g at day 3), with quantitative CMV PCR on biopsy samples obtained at initial sigmoidoscopy were correlated with the primary outcome.Results: Thirty of 76 patients (39%) failed IV corticosteroids and 12 (16%) underwent surgery. Patients with steroid failure had a significantly higher mucosal CMV DNA than responders (3,454 copies/mg [0–2,700,000] vs. 116 copies/mg [0–27,220]; P< 0.01). On multivariable analysis, mucosal CMV DNA load > 2,000 copies/mg (odds ratio [OR], 10.2; 95% confidence interval [CI], 2.6–39.7; P< 0.01) and AIIMS’ index (OR, 39.8; 95% CI, 4.4–364.4; P< 0.01) were independent predictors of steroid-failure and need for colectomy. The combination correctly predicted outcomes in 84% of patients with ASUC.Conclusions: High mucosal CMV DNA ( > 2,000 copies/mg) independently predicts failure of IV corticosteroids and short-term risk of colectomy and it has an additional value to the established markers of disease severity in patients with ASUC.
Preparation and characterization of activated carbons from different kinds of coal
Authors: Damdin Batkhishig , Barnasan Purevsuren , Lin Chung-Jun , Sanjaa Batbileg , Alyeksandr Ariunaa
Published: November 2020

Initial coal was purified in heavy liquid with a density 1.3 cm3 of ZnCl2 solution and purified coal was carbonized and the initial coal samples of each deposits were purified by pyrolysis. Thus, the yield of pyrolysis hard residue in the enriched sample was slightly higher than in the hard residue of initial coal. Therefore, pyrolysis hard residue of purified coal (carbonized sample) was activated at 800°C for 2 hours by preheated water steam. Activated carbons (ACs) and non-activated and non-carbonized coal from Baganuur, Ereen and Nariin Sukhait deposits were technically analyzed and their iodine number, BET surface area, pore volume and adsorption of methylene blue (MB) were determined. When these results were compared, these indicators increased 5-17 times in the Baganuur activated carbon (BN-AC), Ereen activated carbon (E-AC) and Nariin Sukhait activated carbon (NS-AC) as compared to inactivated coal.
Transnational partner meetings in the face of the pandemic – the case of Strategic Partnerships implementing international projects
Authors: Gogacz Adam Krzysztof , Kędzia Marta Małgorzata
Published: November 2020

During the pandemic of COVID-19 the work on projects that require team working has changed. The face-to-face meetings, with the physical presence of participants, were moved to virtual space, enforcing the change in the way of project partners’ communication. The aim of the paper is to indicate the risks in the area of transnational project collaboration resulting from replacing face-to-face meetings with virtual mobility, from the skills’ development perspective. The authors of the paper explain the mechanisms of transnational projects and present how the change of communication towards purely virtual mode may affect the development of skills needed in effective project collaboration and transcultural communication. The discussion is based on the review of the available literature on the challenges of global project teams, the instrumental case study combined with the analysis of statistical data on organisations’ participation in European Strategic Partnerships within Erasmus+ Programme and authors’ experience gained through participant observation of transnational meetings conducted in the period of 2018-2020. Project partners’ participation in face-to-face meetings fosters their personal development and contributes to effective transnational collaboration. The great variety of cognitive, personal, social and communicational skills that face-to-face meetings elicit, and thus contribute to the quality of transnational project team collaboration in the multicultural environment depend on physical presence and interaction of partners. Replacing real presence of project partners with their virtual attendance reduces chances for these skills to be developed and thus may negatively influence the quality of the project collaboration. Taking into account the value that the real presence of project partners brings to international partnerships as well as the development of project team members, it is worth considering, as soon as the pandemic situation allows it, returning to planning and organizing face-to-face international partnership meetings.
Elevtexter i idrott och hälsa – en textetnografisk genreanalys
Authors: Norberg Anna-Maija
Published: November 2020

Studien syftar till att identifiera och beskriva genrer i ämnet idrott och hälsa på högstadiet och att visa hur dessa genrer positionerar eleverna. Genom textetnografiska metoder analyseras elevtexterna med avseende på den sociala handling som de är en del av. Genrer förstås i studien som konventionaliserade sätt att handla genom text. Data har samlats in genom etnografiska metoder, och materialet består dels av elevtexter, dels av fältanteckningar och videoinspelningar från lektioner där skrivande förekom och av ljudinspelningar från lärar- och elevintervjuer. Analysen av materialet drivs på ett övergripande sätt av begreppet ämnesdidaktisk interdiskursivitet. Begreppet affordans används för att visa hur texterna bjuder in till vissa handlingar och begränsar andra. Konkret analyseras texterna med textvetenskapliga metoder. De mest framskjutna genrerna i studien har med mätning och träning av kroppen att göra. Eleverna positioneras främst fysiologiskt utifrån sina kroppsliga förmågor, men genrernas hybriditet leder även till human- och samhällsvetenskapliga positioneringar.
Effect of corn straw pretreatment on efficiency of biogas production process: Computer simulation
Authors: Antanasković Anja , Bulatović Maja , Rakin Marica , Lopičić Zorica , Šoštarić Tatjana , Rakin Marko
Published: November 2020

Anaerobic digestion is a natural process of organic material degradation by different kinds of microorganisms in the absence of oxygen. This process is used for industrial purpose to manage waste streams or to produce biogas. It gives a major contribution in reduction of harmful effects of organic waste disposal to the environment. The aim of agricultural waste pretreatment in biogas production is to decrease the retention time, improve utilization of raw material and improve the overall productivity and energy efficiency of the production process. In this paper the effects of combined chemical and mechanical pretreatment of corn straw biomass on biogas yield during anaerobic digestion of the feedstock were analyzed. The impact of pretreatment and process parameters in biogas production was analyzed by process simulation using the software SuperPro Designer. Using this tool, it was shown that alkaline pretreatment leads to an decrease of degradation time along with an increase in biogas yield.