bluuebunny/crossref_metadata_2025 huggingface dataset:
Lithium chloride outperformed oxalic acid sublimation in a preliminary experiment for Varroa mite control in pre-wintering honey bee colonies
Authors: Kolics Éva , Specziár András , Taller János , Mátyás Kinga Klára , Kolics Balázs
Published: February 2021

Since lithium salts were demonstrated to be very effective for the potential control of Varroa destructor, a highly detrimental parasite of honey bee (Apis mellifera), no studies have been reported on their comparison with any commonly used varroicides in commercial bee colonies. In this study we compared the effectiveness of lithium chloride to that of oxalic acid, a widely used miticide. The results of the present study confirm that lithium has superior efficacy to oxalic acid sublimation both as a main or a supplementary pre-wintering treatment at moderate infestation levels, restricted to certain pre-wintering conditions. Considering its easy implementation in apicultural practice and its twofold mode of action, trickling would be the preferred way of administration after the use of lithium salts as varroicides is authorised.
Higher education internationalization and diplomacy: Successes mixed with challenges. A case study of Hungary's Stipendium Hungaricum scholarship program
Authors: Tong Linh
Published: February 2021

This paper presents a case study of the Stipendium Hungaricum (SH) scholarship program and contributes to the existing body of knowledge on the characteristics, goals, and outcomes of government-sponsored scholarship programs, which typically feature big players like the US, the UK, Germany, France, and China. The central research question is: “What are the stated goals and expected benefits of the SH from the perspectives of key stakeholder groups?” The study focused on three key stakeholder groups, namely: 1) The Hungarian government and the Vietnamese government; 2) Hungarian higher education institutions (HEIs) hosting Vietnamese scholarship recipients; and 3) Vietnamese SH scholarship recipients. Findings from this study suggest that the SH program is driven by three motives: diplomacy, human capital investment, and internationalization. Although internationalization appears to be the dominant goal, elements of diplomacy and human capital investment are indispensable, especially within the context of bilateral cooperation between Hungary and Vietnam. This purposeful combination has both positive and negative impacts. There is evident frustration among the Hungarian HEIs about the inclusion of Hungarian-language degree programs, which seems inconsistent with their internationalization strategy. Furthermore, there is a question about transparency in recruitment of SH scholarship recipients. The SH is an interesting case study to examine the dynamics of internationalization in Hungarian higher education and the multiple roles of government scholarships sponsored by small/middle-sized countries.
Application of deep eutectic solvents combined with vortex assisted dispersive liquid-liquid microextraction for five organophosphorus pesticides in juice and green tea beverage
Authors: Zhao Mingyu , Zhao Ercheng , Wu Junxue , Li Yuqi , Li Baotong
Published: February 2021

In this study, a new microextraction method based on hydrophobic deep eutectic solvents was developed for the extraction and preconcentration of organophosphorus pesticides from beverage samples. The hydrophobic deep eutectic solvents were synthesized from choline chloride and 4-chlorophenol. Main experimental parameters of the microextraction method were investigated to improve the extraction efficiency. The proposed method achieved a satisfactory linear range between 50 and 2,000 μg L−1 with coefficient of determination greater than 0.9939. The extraction recoveries and enrichment factor of five organophosphorus pesticides at three added levels ranged from 71.68 to 113.18% and 71.43–111.11 were obtained with the acceptable relative standard deviation ranged from 1.37 to 11.92%. Limits of detection and quantification were found to be 0.05–0.3 μg L−1 and 0.17–1 μg L−1, respectively. Finally, the methods were successfully applied for the determination of five organophosphorus pesticide in orange juice and green tea.
Multi-pharmaceuticals analysis in fish by continuous series solid-phase extraction coupled with UPLC-MS/MS
Authors: Gao Lei , Wang Peng , Chen Zhongxiang , Tang Shizhan , Wu Song , Li Gang , Qin Dongli
Published: February 2021

Pharmaceuticals which are widely used in aquatic can easily migrate into the environment and aquatic animals, and can increase the risk of drug resistance and allergic symptoms if consumed by humans. In order to achieve high-throughput analysis of pharmaceuticals with different physical and chemical properties from complex matrices, we developed a new method for various types pharmaceuticals in fish and shrimp tissue. Series solid-phase extraction (s-SPE) with different adsorbents was selected for extracting and purifying analytes with different paddings. s-SPE were combined with ultra performance liquid chromatography triple quadruple tandem mass spectrometry (UPLC-MS/MS) for the detection of 30 pharmaceuticals antibiotics in fish samples. This method was stabilized and reliable to determinate the pharmaceuticals in fish and shrimp samples. As the method combined multiple Chinese national standards method, it could be easily treat the multi-pharmaceuticals from the fish and shrimp samples once time. It provided for both quantitative and qualitative methods and they could be applied to single- or multi-residue methods.
Behavioral effects of sub-anesthetic ketamine in a go/no-go task
Authors: Nilsen André Sevenius , Juel Bjørn Erik , Farnes Nadine , Romundstad Luis , Storm Johan Frederik
Published: February 2021

Background and aims

While psychedelic agents are known to have powerful, but largely unexplained, effects on contents of consciousness, there is an increasing interest in the potential clinical usefulness of such drugs for therapy, and legalization is discussed in some countries. Thus, it is relevant to study the effects of psychedelic compounds not only on experience, but also on behavioral performance.

Methods

Seven healthy participants performed a motor response inhibition task before, during, and after sub-anesthetic doses of intravenously administered ketamine. The infusion rate was individually adjusted to produce noticeable subjective psychedelic effects.

Results

We observed no statistically significant impact of sub-anesthetic ketamine on reaction times, omission errors, or post error slowing, relative to the preceding drug-free condition. However, we did observe significant correlations between performance impairment and self-reported, subjective altered states of consciousness, specifically experience of “anxiety” and “complex imagery.”

Conclusions

Considering the limited number of participants and large variation in strength of self-reported experiences, further studies with wider ranges of ketamine doses and behavioral tasks are needed to determine the presence and strength of potential behavioral effects.
El perdón como forma de aprendizaje
Authors: Dans-Álvarez-de-Sotomayor Isabel , Muñiz-Álvarez Eva-María
Published: February 2021

Abordamos el confl icto escolar desde la didáctica del error, que permite tomar como punto de partida una conducta contraria a la convivencia como materia prima del aprendizaje. El docente emprende el proceso de resolución mediante un diálogo paralelo con el agresor y la víctima, de modo que cada cual revise su propia participación en el proceso y su vivencia del mismo, consiga comprender al otro y reconocer su propia realidad: bien como deudor y necesitado de restauración; bien como alguien valioso, injustamente tratado, que tiene en sus manos la posibilidad de donar al otro su restauración mediante el perdón.
Dilemas e Desafios da Comunicação na Vida Cotidiana: As Relações Humanas na Era da Internet
Authors: Machado Patricia , Ladeia de Carvalho William
Published: February 2021

Esse artigo versa sobre as transformações da comunicação na era digital e busca refletir sobre as relações humanas em um cotidiano cada vez mais midiatizado. O objetivo desse estudo é investigar os efeitos do uso da tecnologia na comunicação interpessoal e seus desdobramentos. A metodologia inclui a revisão bibliográfica e a verificação do estado da arte por meio dos estudos de autores que se debruçam sobre o tema da comunicação, do comportamento humano e da tecnologia digital. Por meio do diálogo com nossa base teórica, observamos que as facilidades de comunicação propiciadas pelo uso das mídias digitais incluem paradoxos, dilemas e desafios presentes no cotidiano dos usuários.
A mulher como vítima fatal: feminicídio
Authors: Caldeira Gabriella Pontes de Lemos , Shimidt de Paula Fernando
Published: February 2021

Este artigo científico tem por objetivo estudar o conceito de mulher a partir de pesquisas doutrinárias e jurisprudenciais, para aplicabilidade das leis de proteção de gênero, para o que será analisada a Lei do Feminicídio (nº 13.104/15), o perfil das vítimas e dos criminosos e suas motivações. E, por fim, serão estudadas algumas estatísticas a respeito dessa qualificadora do crime de homicídio.
Trabalho intermitente: uma breve análise sobre seus efeitos no regime geral da previdência social.
Authors: Souza Batista Mario Henrique
Published: February 2021

O presente artigo científico fora resultado de uma investigação realizada acerca do novo contrato de trabalho intermitente, introduzindo no direito brasileiro, pela primeira vez, por intermédio da Lei 13.467 de 13 de julho de 2017 (vigência em 11 de novembro de 2017), conhecida como reforma trabalhista, com o objetivo de apresentar algumas reflexões sobre os impactos que este contrato de trabalho poderá gerar nos aspectos gerais do Regime Geral da Previdência Social, como nos temas inscrição e filiação do segurado; manutenção e perda da qualidade de segurado; períodos de carência; contribuição previdenciária; presunção de trabalho; entre outros. A presente pesquisa foi realizada com base em análises bibliográficas.
Direct and virtual measurements of abdominal aortic aneurysms: three-dimensional printed models
Authors: Gomes Giovanna Ricarte Granja , D’Ornellas Marcos Cordeiro , Dotto Gustavo Nogara
Published: February 2021

Abstract Objective: To validate the use of a three-dimensional printing system for metric and volumetric analysis of the segments of an abdominal aortic aneurysm (AAA). Materials and Methods: In patients scheduled to undergo endovascular AAA repair, the computed tomography angiography (CTA) measurements obtained during the preoperative assessment of the patients were compared with those obtained by computed tomography of individualized three-dimensional biomodels. Results: The volumetric assessment showed a discrepancy of 3-12%, and the difference between the areas was 10-16%. Conclusion: Computed tomography measurements of 3D-printed biomodels of AAAs appear to be comparable to those of threedimensional CTA measurements of the same AAAs, in terms of the metric and volumetric dimensions.
Contents of the inguinal canal: identification by different imaging methods
Authors: Caserta Nelson Marcio Gomes , Penachim Thiago José , Contardi Ewandro Braz , Barbosa Rayssa Clara Fonseca , Gomes Thaisa Lazari , Martins Daniel Lahan
Published: February 2021

Abstract Although the correct diagnosis of inguinal hernias can often be made by clinical examination, there are several situations in which imaging methods represent the best option for evaluating such hernias, their content, and the possible complications. In addition, bulging of the inguinal region is not always indicative of a hernia, because other lesions, including tumors, cysts, and hematomas, also affect the region. The objective of this pictorial essay is to demonstrate what can be identified within inguinal hernias. Differentiating the types of herniated structures is of absolute importance for planning the appropriate treatment.
Género y juventudes Argentinas: ¿de qué estamos hablando cuando hablamos de “el problema del embarazo adolescente”?
Authors: Durán Adriana Beatriz Rodríguez , Muro María Marta
Published: February 2021

Resumen Este artículo buscará echar luz acerca del embarazo adolescente como problema. A través de un recorrido histórico por fuentes bibliográficas, periodísticas y de un corpus de le- yes, se intentará dar cuenta de la naturalización propia del enfoque habitual en esta temática. Un punto central en la pregunta que nos orientará, concierne a la inclusión de la voz de lxs involucradxs, con el fin de pensar estrategias para acompañarlxs en ese momento (entendién- dose como una necesidad imperiosa para lxs mismxs).
Rebelião das mães. Ética do cuidado em coletivo face à necropolítica no encarceramento de adolescentes
Authors: Ribeiro Dillyane de Sousa
Published: February 2021

Resumo Este artigo analisa as práticas e os afetos implicados nas atividades de negociação e denúncia protagonizadas por mães ante o poder necropolítico operado no encarceramento de adolescentes nas unidades de internação do Sistema Socioeducativo em Fortaleza, capital do Ceará. Analiso os modos de construção de vínculos coletivos e de pertença ao Grupo, não como unidade fechada e fixa, mas sim como convergência cuja dinâmica é porosa à influência de outros sujeitos e à ação de suas participantes e a expressão pública de uma ética com centralidade no cuidado por meio do protesto. Tomando como eixo de análise o cuidado em contextos sob o poder necropolítico, explicito como violência, gênero, raça e Estado se coproduzem na conformação de lugares sociais de mães em “luta”.
Redes de resistência e esperança. Narrativas de mães do Ceará que lutam por reconhecimento, memória e amor
Authors: Leite Ingrid Lorena da Silva , Marinho Camila Holanda
Published: February 2021

Resumo Este artigo é um desdobramento do processo de pesquisa sobre a trajetória de vítimas de violência no estado do Ceará (Brasil). Seu objetivo é apresentar as narrativas sobre o sentido da participação em uma rede formada por familiares de vítimas de violência. Para tanto, vale-se da interlocução com três mulheres que são mães e tiveram seus filhos assassinados e/ou encarcerados. A Rede de Mães do Ceará surgiu em 2018 em razão da participação dessas mulheres em uma das edições do Encontro Nacional de Mães e Familiares de Vítimas do Terrorismo do Estado. Observa-se, por intermédio de seus relatos, uma teia de emoções e motivações associadas à ideia de luta por reconhecimento, memória e amor. A metodologia de coleta de dados adotada para a análise somou a realização de um grupo de discussão com as três integrantes da rede cearense a uma série de observações em campo.
The relationship between foreign exchange rate and femicide in Turkey: evidence from the cointegration tests based on nonlinear and Fourier functions
Authors: Çiğdem Gülgün
Published: February 2021

This study aimed to review femicide, which is a result of violence against women and a serious public health problem, from a different perspective. Accordingly, it analyzed the presence of a relationship between foreign exchange, which was an essential trigger of the crises and unemployment, and femicide, which was the result of violence against women different from the act of murder. In the light of this aim, the data were obtained from the We Will Stop Femicide Platform, and the Central Bank of the Republic of Turkey. These data were examined through various analyses. According to the analysis results, a long-term cointegrating relationship was found between the foreign exchange rate and femicide in Turkey. The findings have demonstrated that the deviation caused by a 1% shock in the exchange rate could be balanced after 22.6 days. This study, which is significant in terms of questioning femicide from a neglected economic perspective, contributes to the literature by revealing that current and advanced empirical analyses and exchange rate fluctuations are "vital" in terms of non-economic facts and public health as well.
Chesnutt, Turpentine, and the Political Ecology of White Supremacy
Authors: Kuhn Mary
Published: February 2021

Charles Chesnutt's fiction describes the forests of North Carolina not as the unspoiled wildernesses of the popular imagination but instead as an integral part of the extractive economy of the South. In the postbellum decades, many northerners visited the state's forests for health tourism even as the turpentine and lumber industries were decimating the local pine. By drawing on his readers’ familiarity with turpentine, a pine product that was both a household staple and a global commodity, Chesnutt shows his readers how the pine woods were anything but bucolic. Chesnutt's ecological vision disrupts the centrality of cotton in the environmental imaginary of the plantation and postplantation South. By linking the rise of conservation efforts to the logic of preserving white health, Chesnutt reveals that both deforestation and conservation were driven by the operations of white supremacy.
Properties of pervious concrete with recycled concrete aggregates and cement replacements
Authors: Singh Dilraj , Singh Surinder Pal
Published: February 2021

Pervious concrete, being an environmental friendly type of concrete, has been in demand to control surface runoffs and restore ground water. This study focuses on creating sustainable pervious concrete consisting of recycled concrete aggregates (RCA) replacing coarse natural aggregates (NA) up to 100%. The primary binder ratios have been finalised as 70% ordinary Portland cement (OPC) and 30% fly ash (FA). The incorporation of cement additions has also been encouraged in the form of silica fume (SF) and metakaolin (MK). Ternary and quaternary pervious concrete mixes have been prepared after replacing FA with SF and MK in the binder mix. The mechanical properties of pervious concrete mixes have been examined at different curing ages. The porosity and density of pervious concrete mixes have also been determined. Based on the results of the different mechanical properties, the optimum of all the pervious concrete mixes has been ascertained. In general, addition of SF and MK by replacing FA partially in the binder mix has proven to be advantageous for the properties of RCA pervious concrete. The mix with 10% FA, 10% SF and 10% MK containing 25% RCA content has the best mechanical properties among all the mixes.
ANALYSIS OF UNCONTROLLED REACTIVITY INSERTION TRANSIENT OF TRIGA MARK 2000 BANDUNG USING MTR PLATE TYPE FUEL ELEMENT
Authors: Pinem Surian , Surbakti Tukiran , Kuntoro Imam
Published: February 2021

ANALYSIS OF UNCONTROLLED REACTIVITY INSERTION TRANSIENT OF TRIGA MARK 2000 BANDUNG USING MTR PLATE TYPE FUEL ELEMENT. Analysis of uncontrolled reactivity insertion is very important for the safety of reactor operations. Determination of melting point limit, critical heat fluxes and melting temperatures of cladding are the main objectives for most of these studies to determine whether fuel temperature can withstand the transient insertion of reactivity. In this study, uncontrolled reactivity insertion transient was carried out due to the withdrawal of control rods in nominal power of 1 MW and 2 MW. Analysis of reactivity transient was carried out using the WIMSD/5B and MTRDYN codes. The WIMSD/5B code is used to generate cross sections and the MTRDYN program is used for analysis under transient conditions. Based on calculations on the initial power of 1 MW and 2 MW with an insertion of reactivity of greater than 0.5 $/s the reactor operation  is not safe because the fuel temperature exceeds the design limit. For reactivity insertion 0.5 $/s allows increased power can be stabilized by feedback reactivity. For 1 MW of nominal power, the maximum coolant temperature,  cladding and fuel are 86.39 oC, 164.86 oC and 165.33 oC, respectively. For 2 MW of nominal power,  the maximum coolant temperature,  cladding and fuel are 89.09 oC, 176.96 oC and 177.602 oC, respectively. Based on calculation,  It is concluded that the feedback mechanism can protect the fuel cladding from a local meltdown if reactivity insertion 0.5 $/s and the reactor is in nominal power of 1 MW and 2 MW.
Comparación de tres modelos de etiquetado nutricional frontal de productos industrializados en Perú, 2019
Authors: Pineda Soto Vannya Inés , Del Socorro Estrada Oré Ela Leila
Published: February 2021

Antecedentes: el etiquetado nutricional frontal es una herramienta para orientar la elección del consumidorhacia una dieta equilibrada y sana. Objetivo: conocer el modelo de etiquetado nutricional frontal que más influye en la identificación de calorías y nutrientes críticos de productos industrializados en adultos de Lima, Perú. Materiales y métodos: estudio cuasiexperimental-transversal en el que participaron 384 adultos de ambos sexos distribuidos en cuatro grupos equitativos: sin modelo de etiquetado nutricional, Guía Diaria de Alimentación, etiquetado de advertencia octogonal y Guía Diaria de Alimentación-semáforo. A cada participante se le aplicó un cuestionario con 10 figuras de empaques con el modelo de etiquetado, según el grupo al que correspondían, y 10 preguntas, con un puntaje total de 0 al 20, según el número de respuestas positivas en la identificación de calorías y nutrientes críticos. Resultados: los mayores puntajes totales fueron para los grupos Guía Diaria de Alimentación-semáforo (12,1±3,9) y Guía Diaria de Alimentación (12,1±3,7),con diferencias significativas respecto a los otros dos grupos. También se presentaron diferencias en los puntajes de la identificación de calorías, grasas saturadas y grasa total; los valores más altos fueron para los dos grupos señalados (p<0,05). No se observaron diferencias en la identificación de azúcar y sodio. Conclusiones: los modelos Guía Diaria de Alimentación y Guía Diaria de Alimentación-semáforo son los que más influyen en la identificación de calorías y nutrientes críticos.
De vecinos sufrientes a ciudadanos peticionantes. Actores e instituciones en la construcción de un arte de curar moderno en la provincia de Santa Fe (Argentina, 1847-1907)
Authors: Allevi José Ignacio , Carbonetti Adrián
Published: February 2021

El artículo analiza las transformaciones de las peticiones de salud durante la segunda mitad del siglo XIX en la provincia de Santa Fe (Argentina) para reflexionar sobre su construcción como demanda social. Con el estudio de expedientes administrativos de diversas localidades nos proponemos, en primer lugar, registrar la diversidad de actores que buscaban curar por fuera de la medicina diplomada y las estrategias de la población para conseguir su autorización. En segundo lugar, recuperar las representaciones y saberes que fundaban la comprensión de la enfermedad por parte de quienes demandaban atención en salud. Por último, analizar la mutación de sus apelaciones a un Estado provincial en construcción y su consecuente ciudadanización.
Improving the Visual Interactive Analysis Method for Automation and Control of the Decision-Making Process in Multi-Criteria Design of Complex Mechanical Systems
Authors: Gavruishin S. S. , Bui V. P. , Phung V. B. , Dang H. M. , Nguyen V. D. , Thanh Vu. C.
Published: February 2021

For multi-criteria design problems of complex mechanical systems with a large number of control parameters, technical constraints, and quality criteria, the search for Pareto solution domain takes quite a lot of time varying from hours to days. In fact, the decision-maker (DM) desires to examine a small number of reasonable Pareto optimal solutions in order to understand the problem itself and control the decisionmaking in a simple manner. This paper presents the improvement of a visual interaction analysis method or VIAM developed by the authors with the aim of providing a tool for DM to define the optimal and mutually-agreed solutions in the multi-criteria decision making (MCDM). Indeed, VIAM allows for evaluating the distribution domain of the Pareto optimal solutions defined by the genetic algorithm, which supports the DM to set additional thresholds for the objectives to filter the desired solutions and suggest to shrink or expand the threshold to control the search. In case of mutually-agreed solution non-existence, VIAM allows for providing instruction to reestablish the multi-objective problem that new Pareto solution domains can be found as desired by the DM. Based on VIAM, a visual interaction analysis tool or VIAT was developed by means of Matlab. VIAT was then used for the multi-criteria design of slider-crank mechanism for an innovative fruit vegetable washer with three objectives. Comparative study on the obtained results from VIAT with the existing design option and the obtained solution from the traditional method "concession by priority" has shown the effectiveness of the method proposed in this paper. VIAT is actually a very user-friendly tool that makes the multi-criteria design more practical especially for the mechanical system.
From Dark to Light: The Many Shades of Sharing Misinformation Online
Authors: Metzger Miriam J. , Flanagin Andrew J. , Mena Paul , Jiang Shan , Wilson Christo
Published: February 2021

Research typically presumes that people believe misinformation and propagate it through their social networks. Yet, a wide range of motivations for sharing misinformation might impact its spread, as well as people’s belief of it. By examining research on motivations for sharing news information generally, and misinformation specifically, we derive a range of motivations that broaden current understandings of the sharing of misinformation to include factors that may to some extent mitigate the presumed dangers of misinformation for society. To illustrate the utility of our viewpoint we report data from a preliminary study of people’s dis/belief reactions to misinformation shared on social media using natural language processing. Analyses of over 2,5 million comments demonstrate that misinformation on social media is often disbelieved. These insights are leveraged to propose directions for future research that incorporate a more inclusive understanding of the various motivations and strategies for sharing misinformation socially in large-scale online networks.
Uninvited Dinner Guests: A Theoretical Perspective on the Antagonists of Journalism Based on Serres’ Parasite
Authors: Nordheim Gerret Von , Kleinen-von Königslöw Katharina
Published: February 2021

In the digital age, the crisis of journalism has been exacerbated by antagonistic actors infiltrating the journalistic system without adhering to its norms or logic. Journalism itself has been ill-prepared to respond to this challenge, but journalism theory and research have also had trouble in grasping these phenomena. It is thus the aim of this article to propose a theoretical perspective on a specific set of antagonists characterized by its paradoxical nature. It is ‘the excluded third, included’ as described by Serres, the parasite that is both part of the system and its antagonist. From the perspective of systems theory, the parasite is a subsystem that threatens the integrity of the primary system. Thus, the parasite is defined by the relations that describe its position, its behaviour towards the host system. Due to these peculiarities—this contradiction, this vagueness—it evades a classical bivalent logic. This may be one reason why the paradoxical nature of the antagonist from within, the ‘uninvited dinner guest,’ has not been described as such until now. The parasitic practices follow the logic of the hacker: He is the digital manifestation of Serres’ parasite. Accordingly, parasitic strategies can be described as news hacks whose attack vectors target a system’s weak points with the help of specific strategies. In doing so, they not only change the system output but also compromise its values and exploit its resources.
Modified Likelihood Ratio Test for Sub-mean Vectors with Two-step Monotone Missing Data in Two-sample Problem
Authors: Kawasaki Tamae , Seo Takashi
Published: February 2021

This article deals with the problem of testing for two normal sub-mean vectors when the data set have two-step monotone missing observations. Under the assumptions that the population covariance matrices are equal, we obtain the likelihood ratio test (LRT) statistic. Furthermore, an asymptotic expansion for the null distribution of the LRT statistic is derived under the two-step monotone missing data by the perturbation method. Using the result, we propose two improved statistics with good chi-squared approximation. One is the modified LRT statistic by Bartlett correction,and the other is the modified LRT statistic using the modification coefficient by linear interpolation. The accuracy of the approximations are investigated by using a Monte Carlo simulation. The proposed methods are illustrated using an example.
Cloud Point Extraction Of Cationic Surfactants And Their Ionic Associates With Sodium Dodecyl Sulfate
Authors: Lelyushok S.O. , Doroschuk V.O. , Kulichenko S. A.
Published: February 2021

The distribution of individual cationic surfactants and their ionic associates with the anionic surfactant in the cloud point extraction systems, based on non-ionic surfactant OP-7 was investigated. Determined that the dependence of the extraction degree of halides alkylpyridiniums on carboxylic change length in optimal conditions for extraction is characterized by the existence of maximum for cationic surfactant where n = 12. Decrease as well as increase in carboxylic change length of cation of alkylpyridiniums diminishes the effectiveness of their extraction into the surfactant-rich phase. The peculiarities of inter phase distribution of ionic associates cationic surfactant – anionic surfactant in the micellar extraction systems are investigated. It was shown, that with the increase in carboxylic change length of cationic surfactant the dependence of extraction degree of associates with anionic surfactant is characterized by the existence of the maximum. Most effective into the surfactant-rich phase extracted of ionic associates of three- and tetradecylpyridinium. Decreasing and increasing of hydrophobicity of alkylpyridiniums diminishes the effectiveness of extraction of associates. The established effects are explained by the hydrophobic correspondence between the substrate and the surfactant-rich phase of non-ionic surfactant.
The Stars Are as Variable as the Lines: Fernando Pessoa’s Works Considered from the Perspective of Editorial Agency / As estrelas são tão variáveis quanto as linhas: As Obras de Fernando Pessoa consideradas da perspectiva da mediação editorial
Authors: Pizarro Jeronimo
Published: February 2021

Abstract: Here we discuss editorial agency and its impact in the work of Fernando Pessoa, focusing on perception, mobility and interpretation. A posthumous publication is a privileged object to investigate the complexity of the process of editorial agency and its effects because, in the posthumous extension of a corpus, what is at stake is precisely its construction. We also examine the role of the editor and his intervention, rather than the one of publishers, bearing into account the impact the decisions and reorganizations can have when speaking of posthumous works. We conclude that a “work” is the product, or the result, of the joint work left by an author and that of its editors, and that a work or a set of works is not something determined and established forever, but a reassembled product, or the result of a construction or reconstruction.Keywords: Fernando Pessoa; editorial agency; mobility; interpretation; work; posthumous work.Resumo: Discutimos aqui a mediação editorial e o seu impacto na obra de Fernando Pessoa, com enfoque na perceção, na mobilidade e na interpretação. Uma publicação póstuma é um objeto privilegiado para investigar a complexidade do processo de mediação editorial e os seus efeitos porque, na extensão póstuma de um corpus, o que está em jogo é precisamente a sua construção. Analisamos também o papel do editor (editor) e da sua intervenção, em vez do papel da editora (publisher), tendo em consideração o impacto que as decisões e as reorganizações podem ter quando falamos de obras póstumas. Concluímos que uma “obra” é o produto, ou o resultado, do trabalho, em conjunto, do autor e da obra que deixou, e dos editores; e que uma obra ou um conjunto de obras não é algo determinado ou estabelecido para sempre, mas um produto reorganizado, ou o resultado de uma construção ou reconstrução.Palavras-chave: Fernando Pessoa; mediação editorial; mobilidade; interpretação; obra; obra póstuma.
PESSOA, Fernando. O caso mental português. Edição de Fernando Cabral Martins e Richard Zenith. Lisboa: Assírio & Alvim, 2020.
Authors: Ribeiro Nuno
Published: February 2021

PESSOA, Fernando. O caso mental português. Edição de Fernando Cabral Martins e Richard Zenith. Lisboa: Assírio & Alvim, 2020.
MARTINS, Albano. Pequeno dicionário privativo seguido de Um punhado de areia. Porto: Edições Afrontamento, 2017.
Authors: Valentim Jorge Vicente
Published: February 2021

O presente texto propõe uma breve apresentação e um ponto de partida inicial de leitura do último livro do poeta, ensaísta e tradutor português Albano Martins.
Nota de Apresentação
Authors: Athayde Manaíra Aires , Souza Raquel Dos Santos Madanêlo , Xavier Rodrigo Alexandre De Carvalho
Published: February 2021

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Silicon Headquarters : The Architectural Faces of Digital Capitalism
Authors: Schmidt-Lux Thomas
Published: February 2021

Although digitalization processes are frequently described as being immaterial and ‘virtual’, the importance of material space and architecture in the Silicon Valley is evident. Just recently new headquarters of Apple, Facebook and Google have opened. Based on walk-throughs, interviews, documents and photography, the essay analyses their architecture and spatial organization. The analysis reveals that there is no single, uniform form of contemporary corporate architecture in Silicon Valley, just as there is no coherent picture of the digital. Google builds accessible and permeable, Facebook creates a built community, while Apple builds its very own world, similarly hiding and exposing it. Thus, the analysis of architecture reveals different conceptions of an often monolithically described field.
La competencia digital en la formación inicial docente. Percepción de los estudiantes de Magisterio de la Universidad de Valencia
Authors:   Universitat de València, Gagarda Méndez Vicente , Marin Suelves Diana ,   Universitat de València, Romero Rodrigo María de las Mercedes
Published: February 2021

La formación inicial de los docentes resulta un aspecto fundamental para la mejora de los sistemas educativos. En esta línea, este estudio pretende conocer la percepción de los futuros maestros en relación a la importancia de las competencias básicas en su formación y, de forma específica, su concepción sobre la competencia digital, su utilidad y su percepción de autoeficacia. La información de la muestra, compuesta por 104 estudiantes de los Grados de Maestro/a en Educación Infantil y Primaria de la Universitat de València, ha sido recogida a través de un instrumento diseñado ad hoc para la investigación. Los resultados muestran que los estudiantes perciben como competencias fundamentales la comunicación lingüística, las competencias sociales y cívicas o la competencia de aprender a aprender, quedando en segundo plano la competencia digital. Sobre ésta, tienen una percepción mayoritariamente instrumental, otorgándole utilidad especialmente para aumentar la motivación de los estudiantes y percibiendo una mayor autoeficacia en aspectos vinculados a las dimensiones informativa y comunicativa.
Objetivos de desarrollo sostenible y educación para el desarrollo sostenible: aplicaciones a la enseñanza de la asignatura Cinética Química del Grado en Química
Authors:   Universidad de Alicante, Iniesta Iniesta Valcárcel Jesús , Martínez Lirola María ,   Universidad de Alicante
Published: February 2021

El objetivo de este artículo es presentar una propuesta didáctica enmarcada en la educación para el desarrollo sostenible (EDS) que incorpore los Objetivos de Desarrollo Sostenible (ODS) para permitir al alumnado profundizar en temas globales en la asignatura Cinética Química (CQ) en la enseñanza universitaria. Se describirán las actividades de CQ y se establecerán las relaciones entre los ODS y la adquisición de las competencias y los contenidos, prestando especial atención a la sostenibilidad como tema transversal. Se presentará el análisis de una encuesta anónima con el fin de obtener datos cuantitativos y así valorar la eficacia de las actividades enmarcadas en la EDS que el alumnado realiza en la asignatura. La encuesta revela que el alumnado ha tomado conciencia de que además de adquirir conocimientos, profundiza en los ODS y en competencias sociales útiles tanto para su vida laboral como personal.
Soluciones exactas de agujeros negros en la teoría generalizada de Proca
Authors: Cubides Pérez Sergio Manuel , Rodríguez García Yeinzon
Published: February 2021

Con el fin de restringir la teoría generalizada de Proca y de determinar su compatibilidad con las futuras observaciones en el ámbito astrofísico, se estudiaron soluciones de agujeros negros en el marco de esta teoría. Para ello, en primer lugar, se determinaron las ecuaciones de campo gravitacional y de campo vectorial correspondientes a la acción generalizada de Proca para, posteriormente, obtener sus versiones adaptadas a agujeros negros estáticos y esféricamente simétricos. Posteriormente se encontraron soluciones de las ecuaciones de campo para diferentes tipos de acoplamientos dentro de esta teoría las cuales, debido a las condiciones establecidas para las funciones métricas, difieren de las soluciones de Reissner-Nordström y de Schwarzschild tan sólo en las funciones que describen al campo vectorial dependiendo del acomplamiento estudiado. A juzgar únicamente por este resultado, la teoría de la Relatividad General luce más atractiva que la teoría generalizada de Proca.
Análise da emergência e desenvolvimento inicial de plântulas de Handroanthus roseo-albus (Ridl.) Mattos e Handroanthus serratifolius (Vahl) S.O.Grose sobre diferentes tipos de substratos
Authors: Da Silva Regimonica Craveiro , Campos Aguiar Bruno Aurélio , Almeida Gomes Taiuan Bruno , Xavier Milena Oliveira , Fonseca Euclides Figuerêdo , De Souza Priscila Bezerra
Published: February 2021

The formation of quality forest seedlings has a direct relationship with the substrates that will be used; the germination of seeds and the formation of the root system and the aerial part are associated with the particular characteristics of each substrate. Therefore, the study aimed to evaluate the influence of different substrates on the formation of ipê-branco and ipê-amarelo seedlings. The experimental design adopted was completely random, with the treatments distributed in a 2 x 5 factorial arrangement (2 species and 5 substrates), with 4 replications. We used the following components to compose the substrates: carbonized rice husks (CAC), fresh rice husks (CA), autoclaved for two hours at 120 °C, commercial substrate (SC) Bioflora, washed sand (AL), and bovine manure (EB). The study was arranged in five treatments: treatment 1 - CAC, treatment 2 - CA, treatment 3 - SC, treatment 4 - AL and treatment 5 - EB. The following morphological characteristics have been evaluated: Collection diameter, height of the seedlings and the Dickson Quality Index (DQI) of the seedlings, which was obtained through the variables: weight of total dry matter (TWMW), weight of dry matter of the aerial part (TWMW), weight of dry matter of the root (RWMW), H and DC. The emergence speed and the emergence percentage index were lower for both species in the treatment containing 100% in natura rice husk. The commercial substrate Bioflora, enabled good performance in the emergence of both species, obtaining satisfactory results in terms of the percentage rate of emergence and a higher speed of emergence between treatments. The bovine manure substrate obtained superior results in the initial development for both Handroanthus serratifolius (Vahl) S.O.Grose and Handroanthus roseo-albus (Ridl.) Mattos.
On Recognizability of Groups by Bottom Layer
Authors: Senashov Vladimir , Parashchuk Ivan
Published: February 2021

The bottom layer of a group is a set of its elements of prime order. A group is called recognizable by bottom layer under additional conditions if it is uniquely restored by bottom layer under these conditions. A group is called almost recognizable by bottom layer under additional conditions, if there are a finite number of pairwise non-isomorphic groups satisfying these conditions, with bottom layer that is the same as that of the group. A group is called unrecognizable by bottom layer under additional conditions if there are an infinite number of pairwise non-isomorphic groups satisfying these conditions, with bottom layer that is the same as that of the group. In the paper we consider examples of groups recognized by bottom layer, by spectrum and, simultaneously, by spectrum and by bottom layer. We have also proved some results of recognizability of groups by bottom layer.
An Evaluation of the Chemical Composition of Soft Drinks in Nigeria: A Principal Component Analysis Approach
Authors: Adams Samuel Olorunfemi , Akano Rafiu Olayinka , Rauf Rauf Ibrahim
Published: February 2021

This study aims to determine the relationship between the chemical compositions of twenty-five (25) soft drinks sold in Nigeria. Sample concentration of twenty-five (25) soft drinks used in the study was collected from the National Agency for Food and Drug Administration and Control (NAFDAC). Principal Component Analysis (PCA) was employed to explain the relationship between the chemical compositions and determine the soft drinks' chemical composition distribution. The result has shown that all except acidity and antioxidant has a significantly strong positive relationship among the chemical structures. PCA suggested retaining three components that explained about 82.465 per cent of the data set's total variability. It was observed that carbonated water, fructose, sucrose, main concentration, stabiliser, E412, colouring and gelatin were the major compositions of the soft drinks in Nigeria, Base on the findings in this study, it is recommendations that; Consumers who are allergic to sugar or diabetic should avoid taking any of the soft drinks with high sugar concentration. Soft drinks companies producing drinks with high sugar content should consider their customers who are diabetic and allergic to high sugar levels.
Contribution of SAR Radar Imagery in the Study of the Dynamics of the Danube Island System, Giurgiu-Călăraşi Sector, Romania
Authors: Hachemi K. , Grecu F. , Ioana-Toroimac G. , Grigorie (Omrani) Ş. , Ozer A. , Kuzucuoglu C.
Published: February 2021

SAR radar imagery allows spatial and temporal, regular and precise tracking of surfaces. The response of the radar signal is particularly sensitive to the topography, the roughness and the humidity of the grounds, thus making it possible to detect possible changes occurring between different acquisitions. The surface of the islands is formed especially of alluvial materials and covered by vegetation. The latter contributes greatly to the stability of the islands. The aim of this work is to show the contribution of radar imagery in the study of the dynamics of the Danube island system, Giurgiu-Călăraşi sector, in Romania. This study, based on amplitude images, showed the possibility of determining, locating, inventorying and mapping 11 islands (including 19 sub-islands). The radar images delimit perfectly the latter due to their sensitivity to roughness. Their surface is very rough and wet represented by a strong radiometry. On the other hand, the water surface is smooth thus giving values of low radiometry. The first results obtained show that over this period between 1995 and 2009, the changes are due mainly to weather conditions, precipitation and very high wind speeds. They also reveal an increase in sediment over this 14-year period.
Sensorless Speed Control of IPMSM Using Sliding Mode Observer Based on Active Flux Concept
Authors: Boussekra Fayza , Makouf Abdessalam
Published: February 2021

This paper proposes a new speed and position sensorless control method of Interior permanent magnet synchronous motors (IPMSM) using sliding mode observer based on Active Flux concept. First, a new description of IPMSM dynamic model in the stationary reference frame using active flux concept is proposed. The model obtained suits for both SPMSM and IPMSM in the stationary reference frame, Therefore, all that sensorless controls proposed for SPMSM can be directly and easily applied to IPMSM. Secondly, from the measurement of the voltages and the currents, a new analysis of the observability property is developed. Then, the sliding mode observer (SMO) structure and its design method are described in the stationary reference frame by using the active flux equation. A “chattering” phenomenon is reduced by using this technique. The stability of the proposed SMO was verified using the Lyapunov function. The speed and position of the IPMSM are estimated based on back EMF which are related to the active flux. Moreover, the zero d-axis current control strategy is used to control the IPMSM. Finally, the proposed method on the proposed model has been simulated and tested to show the effectiveness of the proposed scheme.
Three Dimensional Magnetohydrodynamic Stretched Flow of Cross Nanofluids
Authors: Misra Ashok , Mishra Soumyendra , Hakeem Abdul Kaffoor Abdul , Nayak Manoj Kumar
Published: February 2021

The purpose of the present study is to analyze the flow, heat and mass transfer characteristics in the three dimensional magnetohydrodynamic stretched flow of Cross nanofluids. In the present study, Brownian movement, thermophoresis, thermal and solute convective boundary conditions are considered. With boundary layer approximation and self-similarity transformations, the non dimensional nonlinear governing equations are solved via shooting iteration technique together with 4th order Runge-Kutta integration scheme. The impact of developed physical parameters on velocity, temperature, concentration, surface viscous drag, heat and mass transfer rates has been examined via appropriate graphs and discussions. The numerical results indicate that uplift in the magnetic field strength and Weissenberg number diminishes the axial and transverse velocity fields. Further, the temperature ratio parameter brings about substantial improvement to the temperature and the related layer. The outcomes of the present study provide significant contribution to the controlled fluid motion and regulating the rate of heat transportation from the solid boundary into the boundary layer.
ELECTRONIC NOSE (E-NOSE) DESIGN FOR ARDUINO NANO-BASED HALAL HARAM IDENTIFICATION
Authors: Kadafi Muammar , Putra Rachmad Almi
Published: February 2021

It has been successfully designed an Electronic Nose (e-Nose) instrumentation system consisting of 6 MQ gas sensors, namely, MQ2, MQ4, MQ5, MQ7, MQ9, MQ135. The E-nose system is used to identify halal-haram food. This E-Nose system uses an Arduino Nano microcontroller. The Graphic User Interface (GUI) system is built with Visual Studio 2008. Then, the data responses will be evaluated by using 2 patterns recognition methods called Principle Component Analysis (PCA). The classification results can be explained by the value of the score plot on the PCA of the data. PC1 accounts for 19% of the variance, and PC2 accounts for 5% of the variance, data obtained is stored and displayed on personal computers in Excel format. Each sample was tested for up to ten repetitions. The data obtained from the six sensors in the e-nose was processed using Minitab 18 and it was necessary to obtain classification data on lard, pig oil, and sample B, which were fried crackers using pork oil.