bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on a novel fault diagnosis method based on integrating EMD, fuzzy entropy, improved PSO and SVM
Authors: Deng Wu , Yao Rui , Sun Meng , Zhao Huimin , Luo Yinglian , Dong Chang
Published: June 2017

In order to effectively improve the fault diagnosis accuracy of motor bearing, a new fault diagnosis method based on integrating empirical mode decomposition(EMD), fuzzy entropy, improved particle swarm optimization(PSO) algorithm and support vector machine (SVM) is proposed in this paper. In the proposed fault diagnosis method, the EMD method is used to decompose vibration signals into a series of basic intrinsic mode functions (IMFs). Then the fuzzy entropy is used to effectively extract the features of vibration signal, which are regarded as input vectors of SVM. The dynamic adjustment strategy of arctangent function of learning factor, decreasing inertia weight of function and adaptive mutation strategy of particles are used to improve the basic PSO algorithm in order to avoid premature convergence, escape from falling into the local optimal value and improve the optimization performance. And the improved PSO algorithms are selected to optimize the parameters of SVM in order to improve the generalization ability and the classification accuracy. And then a new fault diagnosis method is obtained. Finally, the actual vibration signals of motor bearing are selected to verify the effectiveness of the proposed fault diagnosis method. The experiment results show that the improved PSO algorithm can effectively obtain the optimal combination values of parameters of SVM, and the proposed fault diagnosis method can accurately and quickly diagnose the faults of motor bearing with the higher reliability. And it provides a new idea based on making full use of the advantages of each method for studying motor fault diagnosis.
Mobile crawler robot vibration analysis in the contexts of motion speed selection
Authors: Gierlak Piotr , Kurc Krzysztof , Szybicki Dariusz
Published: June 2017

The article presents the methodology of body vibration analysis of an inspection robot with the use of flexible connection between the body and the track propulsion modules. The article presents the methodology of selection of motion parameters of an inspection robot, taking into account the vibration of the robot body. The speed of movement of the robot affects the frequency of contact track claws with the ground, which is related to the frequency of vibration excitation. Robot motion parameters are chosen in such a way so as not to over-stimulate the natural frequency of the system. Due to the vibration reduction, it was possible to install a visual system based on an Ethernet video camera without a stabilizer in the body of the robot. Such an approach enables mass production of robots without active suppression systems and video stabilizers which generate high production costs, increase weight of robots and energy consumption.
Cylindrical piezorobot’s trajectory planning and control
Authors: Janutenaite-Bogdaniene Jurate , Macerauskas Eugenijus , Drukteiniene Asta , Kulvietis Genadijus , Bansevicius Ramutis
Published: June 2017

This paper analyses the movement of piezoelectric actuator. The goal of this work was to create an algorithm for trajectory planning of piezorobot, create a system for trajectory control, develop software and verify the functioning of the algorithm in practice. Movements of piezorobot are very small and very frequent therefore it is difficult to measure trajectories using standard equipment. Design of a novel measurement system and trajectory adjustment was created in this paper. An experimental system for control and trajectory movement tracking of piezorobot was developed. It consists of cylindrical piezorobot, control signal forming and image processing system for trajectory tracking. The cylindrical piezorobot moves in specific trajectories on the plane and is controlled with sinusoidal signals. They are generated by trajectory forming and control software using MATLAB and LabVIEW. The control signals are monitored using a system with oscilloscope. The trajectory of piezorobot was monitored and measured using video camera and video processing software developed by LabVIEW. The software contains image processing and object path tracking, and is implemented using LabVEW and MATLAB. Experimental results showed that trajectories forming algorithm and developed control software is suitable for controlling robots moving on plane.
Study on dynamics of vibrator baseplate at low and high frequencies
Authors: Huang Zhiqiang , Li Gang , Hao Lei
Published: June 2017

In order to figure out the dynamics response of vibrator baseplate and why baseplate performs poorly at high frequencies, a finite element model of vibrator-ground is developed to analyze acceleration, deformation and decoupling of the baseplate at low and high frequencies. Results show that the acceleration at low frequencies is in accordance with the function of hydraulic pressure. On the contrary, the acceleration at high frequencies is irregular and fluctuant. Within the bandwidth, the maximum deformation locates in the central area, and the baseplate deformation in long-axis direction is greater than that in minor-axis direction. Compared to low frequencies, dynamics response at high frequencies suffers response delay, and the vibrator structure is very sensitive to asymmetry, resulting in warping and waveform deformation. Baseplate experiences decoupling at both low and high frequencies, however, the decoupling at high frequencies occurs more frequently, which leads to more serious distortion. It is also found that symmetrical structure is helpful for reducing negative deformation. In conclusion, high fluctuation of acceleration, response delay and harmonic caused by complicated deformation and decoupling distortion reduce the quality of output signal and block the bandwidth towards high frequencies.
Dynamics analysis and simulation verification of a novel knee joint exoskeleton
Authors: Fan Lei , Yan Lei , Xiao Jiang , Wang Fangzheng
Published: June 2017

A novel knee joint exoskeleton, is designed in this paper, including the mechanical structure and hydraulic damper. To determine the spring parameters of knee joint exoskeleton and verify its effectiveness, we conduct the following studies. Firstly, forward kinematics analysis of the swing phase is obtained and Lagrange dynamics analysis is carried out. Secondly, the 3D model of exoskeleton is set up and ADAMS simulation is conducted. Then the spring parameters of knee joint exoskeleton are selected, including the spring force, the spring stiffness coefficient and the spring expansion, according to the simulation results. Finally, there are three sets of moments on the non-wearable side, the moments resulted from ADAMS simulations, the moments from the CGA (Clinical gait analysis) and the moments calculated from the Lagrange equation are compared, results show they are in good agreement. The effectiveness of the ADAMS simulation proves that the parameters of the hydraulic damper can meet the actual requirements. The simulation analysis of the exoskeleton provides important parameters for the manufacture and it also provides theoretical basis for the later control theory.
Synthesis of coral-globular-like composite Ag/TiO2-SnO2 and its photocatalytic degradation of rhodamine B under multiple modes
Authors: Song Q. , Li L. , Zhuo N. , Zhang H. N. , Chen X. , Li Y. X.
Published: June 2017

Taking cetyltrimethylammonium bromide (CTAB) as the template and using TiO2 as the substrate, coral-globular-like composite Ag/TiO2-SnO2 (CTAB) was successfully synthesized by the sol–gel combined with a temperature-programmed treatment method. X-ray diffraction, scanning electron microscopy (SEM), UV–vis diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy, SEM combined with X-ray energy dispersive spectroscopy, and N2 adsorption–desorption tests were employed to characterize samples' crystalline phase, chemical composition, morphology and surface physicochemical properties. Results showed that composites not only had TiO2 anatase structure, but also had some generated SnTiO4, and the silver species was metallic Ag0. Ag/TiO2-SnO2 (CTAB) possessed a coral-globular-like structure with nanosheets in large quantities. The photocatalytic activity of Ag/TiO2-SnO2 (CTAB) had studied by degrading organic dyes under multi-modes, mainly using rhodamine B as the model molecule. Results showed that the coral-globular-like Ag/TiO2-SnO2 (CTAB) was higher photocatalytic activity than that of commercial TiO2, Ag/TiO2-SnO2, TiO2-SnO2 (CTAB), and TiO2-SnO2 under ultraviolet light irradiation. Moreover, Ag/TiO2-SnO2 (CTAB) composite can significantly affect the photocatalytic degradation under multi-modes including UV light, visible light, simulated solar light and microwave-assisted irradiation. Meanwhile, the photocatalytic activity of Ag/TiO2-SnO2 (CTAB) was maintained even after three cycles, indicating that the catalyst had good usability.
Transformación estructural del Ejército colombiano. Construcción de escenarios futuros
Authors: Ciro Gómez Andrés Rolando , Correa Henao Magdalena
Published: June 2017

El Ejército de Colombia entiende la transformación militar como una sucesión planeada de trabajos, esfuerzos e iniciativas tendientes a preparar la Fuerza para afrontar los retos venideros en los ambientes operacionales complejos. Estos desafíos atienden a las nuevas realidades materiales y políticas que se consolidan en el Estado y que determinan una revisión de la forma como las Fuerzas Militares, y en general la Fuerza Pública, concibe y cumple su finalidad constitucional. El proceso de transformación en curso se enmarca en fundamentos constitucionales que informan íntegramente la postura del Ejército del futuro. Este documento, por tanto, enuncia el valor de la Constitución como soporte ineludible de cualquier acción del Estado y analiza los conceptos constitucionales determinantes para el proyecto del Ejército del futuro.
Migraciones y Derechos Humanos. El caso de la Comunidad Andina (CAN)
Authors: Benavides Llerena Gina , Chávez Núñez Gardenia
Published: June 2017

Este artículo expone los principales aportes del informe regional “Migraciones y derechos en la región andina. Una mirada desde la sociedad civil”. Inicia con la descripción de los aspectos metodológicos que orientaron el estudio. Luego se hace una caracterización general de las migraciones internacionales en la región, se ubican datos demográficos y socioeconómicos, algunos antecedentes históricos y los principales flujos que se registran en los ámbitos intra- y extracomunitario. Así mismo, incluye un análisis del valor regional de los instrumentos internacionales de derechos humanos. Finalmente, el artículo expone algunas conclusiones puntuales sobre esta caracterización general, a partir de las cuales se observa que la movilidad internacional en la región es un hecho social relevante, especialmente en las tres últimas décadas, e incluye flujos de emigrantes, inmigrantes y personas en situación de refugio y asilo. Esto último implica una serie de desafíos para el respeto, la protección y la garantía de los derechos de las personas que están en situación de movilidad humana.
Los puntos de conexión rígidos para determinar la ley aplicable al contrato internacional en la Unión Europea. ¿Evolución o retroceso?
Authors: Martínez Luna William Fernando
Published: June 2017

La determinación de la ley aplicable a los contratos internacionales en defecto de elección de parte en la Unión Europea estuvo regulada durante más de veinte años por el artículo 4 del Convenio de Roma de 1980. Dicho precepto mezclaba un alto grado de flexibilidad para elegir la ley del contrato —mediante el principio de los vínculos más estrechos—, con un moderado nivel de rigidez presunción basada en la teoría de la prestación característica—. Este precepto generó muchas dificultades interpretativas, lo que produjo gran cantidad de sentencias contradictorias. Con ocasión de la trasformación del Convenio de Roma de 1980 en un Reglamento de la Unión Europea, se aprovechó para incluir importantes modificaciones al artículo 4, lo cual dio atención especial el establecimiento de normas rígidas para determinar de manera inflexible la ley aplicable a ocho de los más importantes contratos internacionales. El presente artículo pretende analizar si los puntos de conexión rígidos para determinar la ley aplicable constituyen una solución que permita alcanzar un alto grado de seguridad jurídica en la Unión Europea.
“Vidas secas”, de Graciliano Ramos: da linguagem discursiva para a visual.
Authors: Olivati Alice Elias Daniel , Schettino Paulo Braz Clemencio
Published: June 2017

RESUMOA pesquisa teve como objetivo estudar as adaptações da obra literária Vidas Secas, de Graciliano Ramos, da linguagem escrita para o cinema, realizada por Nelson Pereira dos Santos. O primeiro conhece-se pelo seu estrato fônico-lingüístico configurado por um entrelaçamento de vocábulos, sintagmas, efeitos sonoros materializados por meio de seu sistema sígnico firmemente baseado na palavra. O segundo, pela linguagem visual, formada através de movimentos de câmera, gestos, fala de personagens, trilha sonora e prescinde, ora mais ora menos, do texto verbal para se constituir. A trajetória teórico-metodológica proposta para a investigação contou com a Semiótica da Cultura; reflexões sobre as artes e seu poder de comunicação; a cultura de massa, os meios, as especificidades da literatura e do cinema. O estudo comparativo da obra que empreendemos em nossa pesquisa, constituiu-se caminho que nos levou à compreensão de que a travessia de signos captados da literatura, sua integração e incorporação em outras formas de expressão, podem ser capazes de engendrar novas concepções no cinema, de modo a recriar e a enriquecer a cultura em tempos de seduções mediáticas.
A utilização de tecnologias da informação e comunicação para o ensino do violão
Authors: Silla Junior Carlos Nascimento , Correa Junior Roque , Loyola Filho Luiz Carlos Martins , Carvilhe Claudio
Published: June 2017

O violão é o instrumento musical mais difundido no Brasil. Considerando os diversos avanços das tecnologias de informação ecomunicação nos últimos anos, neste trabalho é feita uma pesquisa inicial com o intuito de entender como essas tecnologiassão utilizadas pelos professores de violão. Os objetivos específicos deste estudo são: Levantar e caracterizar as ferramentastecnológicas que os participantes utilizam direta ou indiretamente para o estudo/ensino e investigar as motivações que os levama utilizar tais ferramentas. Informações relevantes foram obtidas com base nos dados coletados, entre elas que: tecnologiasdiversas estão sendo utilizadas por professores de violão; utiliza-se amplamente tecnologias não específicas para violão;não existem ferramentas que possibilitem uma melhor aproximação professor/aluno e principalmente, que existe a demandapor um software específico que concentre soluções para as mais diversas necessidades de aprendizagem. Conclui-se que éimprescindível ampla pesquisa futura envolvendo tecnologia e ensino da música produzindo além de produtos, conhecimentoacessível a todos.
Desvelando heranças, tradições e práticas de jovens de Japaratuba/SE-Brasil
Authors: Vargas Maria Augusta Mundim
Published: June 2017

Este estudo traz o desenvolvimento de oficinas realizadas com jovens objetivando demonstrar uma metodologia aplicada a levantamentos e análises das expressões culturais. Para tal, apresenta-se, aqui, a evolução das diversas técnicas e instrumentais utilizados desde 2009, ressaltando sua abordagem qualitativa, as vantagens de se realizar em curto espaço de tempo e as possibilidades de aplicação em outros estudos. Ademais, o texto registra como a vivência permitiu apreender seus referentes patrimoniais e identitários e construir uma cartografia cultural referenciada pelos conteúdos levantados e pelas técnicas executadas na oficina.
Transmission of Service from Leader to Followers: A Parallel Multiple Mediator Model
Authors: Liu Pingqing , Shi Junxi
Published: June 2017

We applied social learning theory and social exchange theory to examine a parallel multiple mediator model of how perceived servant leadership affects employee service performance. Data collected from 404 supervisor–subordinate dyads revealed that service climate (environmental
factor) and the leader–member relationship (psychological factor) played a parallel mediation role in the relationship between servant leadership and employee service performance. Our findings expand both research on service objects and perspectives on service industries, and provide
a new opportunity to clarify the essence of service behavior. The implications of these results and study limitations are discussed.
The precarity of critique: Cultures of mistrust and the refusal of justification
Authors: Witte Daniel
Published: June 2017

The paper reflects on recent developments towards authoritarianism and
right-wing populism that have become apparent in a number of Western
societies and aims at pinpointing possible cultural foundations for this
trend. Using the example of the German PEGIDA movement and the wider milieu
in which it is embedded, it identifies and describes a rapidly spreading
culture of mistrust and discusses some of its political and epistemological
implications. In a second step, the paper draws on Luc Boltanski?s theory of
justification in order to attain a better understanding of this political
movement?s specificities. It is argued that it is a quasi-violent refusal of
justification which is constitutive for the movement in question, thereby
transcending the reach of Boltanski?s framework to some extent. In a third
step, a closer look is taken at the epistemological paradox that results
from the fact that a number of the PEGIDA movement?s crucial points of
criticism are effectively shared by a larger part of the overall population,
raising severe problems for the question of sociological critique. The paper
utilizes ideas by Bruno Latour in order to illuminate this paradox further
and examine its consequences. It closes with remarks on the possibility to
?reassemble? trust and critique as crucial but contested - and, hence,
precarious - foundations of modern society.
The game you are in: Misleading through social norms and what’s wrong with it
Authors: Herzog Lisa
Published: June 2017

This paper discusses the phenomenon of misleading about ?the game you are
in.? Individuals who mislead others in this way draw on the fact that we
rely on social norms for regulating the levels of alertness, openness, and
trust we use in different epistemic situations. By pretending to be in a
certain game with a certain epistemic situation, they can entice others to
reveal information or to exhibit low levels of alertness, thereby acting
against their own interests. I delineate this phenomenon from direct lies
and acts of misleading by implication, and discuss some variations of it. I
then ask why and under what conditions it is morally wrong to mislead others
about the game they are in. I distinguish three normative angles for
understanding the phenomenon: deontological constraints, free-riding on a
shared cultural infrastructure, and implicit discrimination against
outsiders and atypical candidates. I conclude by briefly discussing some
practical implications.
Social justice and the formal principle of freedom
Authors: Nikolic Olga , Cvejic Igor
Published: June 2017

The aim of this paper is to show, contra the right-libertarian critique of
social justice, that there are good reasons for defending policies of social
justice within a free society. In the first part of the paper, we will
present two influential right-libertarian critiques of social justice, found
in Friedrich Hayek?s Law, Legislation and Liberty and Robert Nozick?s
Anarchy, State and Utopia. Based on their approach, policies of social
justice are seen as an unjustified infringement on freedoms of individual
members of a society. In response to this critique, we will introduce the
distincion between formal and factual freedom and argue that the formal
principle of freedom defended by Hayek and Nozick does not suffice for the
protection of factual freedom of members of a society, because it does not
recognize (1) the moral obligation to help those who, without their fault,
lack factual freedom to a significant degree, and (2) the legal obligation
of the state to protect civic dignity of all members of a society. In the
second part of the paper, we offer an interpretation of Kant?s argument on
taxation, according to which civic dignity presupposes factual freedom, in
order to argue that Kant?s justification of taxation offers good reasons for
claiming that the state has the legal obligation to protect factual freedom
via the policies of social justice.
A METODOLOGIA DA INVESTIGAÇÃO TEMÁTICA: ELEMENTOS POLÍTICO-EPISTEMOLÓGICOS DE UMA PRÁXIS DE PESQUISA CRÍTICO-EMANCIPATÓRIA
Authors: Saul Alexandre , Saul Ana Maria
Published: June 2017

No ano em que se celebra 20 anos da ausência de Paulo Freire no mundo, este artigo homenageia esse autor clássico colocando em evidência a investigação temática, um método de pesquisa e construção de conhecimento contra hegemônico, criado por Freire, que contribui de forma original para o campo das ciências humanas e sociais. Essa abordagem de pesquisa se apoia na epistemologia dialética na qual a realidade é compreendida como um processo histórico, complexo e contraditório, em permanente devir. Constitui-se em marco teórico para metodologias participativas, contrapondo-se à lógica instrumental, uma vez que fundamentalmente importa a produção de conhecimentos críticos que auxiliem os sujeitos a compreender e superar suas situações-limite, colocando a reflexão teórica a serviço da ação para transformar compreensões e práticas. Essa posição não pode ser confundida com uma postura pragmática, que reduz o ato de pesquisar à resolução imediatista de problemas da prática cotidiana, nem tampouco a uma forma ativista de mobilização política. Nessa forma de investigar, que carrega em si os princípios da educação crítico-emancipatória, os sujeitos podem refletir sobre as condições em que vivem e trabalham e, em interação, procurar compreender, criticar e enfrentar os mecanismos que sustentam a desigualdade e a exploração nos níveis local, médio e macro da estrutura social.
A BASE NACIONAL COMUM CURRICULAR E A PRODUÇÃO BIOPOLÍTICA DA EDUCAÇÃO COMO FORMAÇÃO DE “CAPITAL HUMANO”
Authors: Carvalho Janete Magalhães , Silva Sandra Kretli , Delboni Tânia Mara Zanotti Guerra Frizzera
Published: June 2017

Este artigo debate a Base Nacional Comum Curricular (BNCC) tomando, como ponto de partida, os enunciados discursivos expressos no site oficial do Movimento pela Base Nacional Comum Curricular. Trata-se, portanto, de uma pesquisa bibliográfico-documental. Problematiza como a BNCC, ao apresentar um conjunto padrão de conhecimentos e habilidades essenciais que cada estudante brasileiro deve aprender a cada etapa da Educação Básica, se afirma como um dispositivo de poder que busca controlar e/ou regular a vida, no sentido de estabelecer quais conhecimentos e habilidades são essenciais, em termos de competências individuais, para fundamentar as avaliações em larga escala, os processos de aprendizagem recognitivos, a formação do homo economicus neoliberal, ignorando os múltiplos contextos escolares não definíveis a priori. Conclui sobre a necessidade de buscar, no âmago da petrificação da vida, a sua afirmação, via um movimento de composição no plano de imanência do currículo que se contraponha ao biopoder, quer dizer, ao poder sobre a vida, pois a biopotência conecta-se ao desejo coletivo de conexão com os múltiplos contextos e cotidianos escolares, assim como com a ideia de currículo como corpo grupal que apresente consistência num plano de composição de um comum plural. Nesse sentido, a comunidade escolar necessita minimizar os fatores que induzem à passividade ou à potência mínima grupal e estabelecer conexões e/ou modos de associação que possibilitem, na grupalidade, o compartilhamento de ideias e experiências, agenciando a potência máxima de realização curricular.
PRÁTICA PEDAGÓGICA E DIDÁTICA HUMANIZADORA: MATERIALIDADE DE PRESSUPOSTOS DE PAULO FREIRE
Authors: Sampaio de Carvalho Braga Maria Margarete , Fagundes Maurício Cesar Vitória
Published: June 2017

Com o objetivo de anunciar ações e relações que contribuem para a construção de uma didática humanizadora na Educação Básica e Superior, via práticas pedagógicas participativas, foram utilizadas como campo empírico duas instituições, uma de Ensino Fundamental e outra de Ensino Superior. O estudo decorre de duas pesquisas de abordagem qualitativa, do tipo etnográfico, que recorreram a entrevistas semiestruturadas, observação participante e análise de documentos para a coleta da empiria. Freire (1978, 1982, 2002, 1988, 2000, 2007, 2001, 1996, 1984); Shör e Freire (1986); Freire e Faundez (1985) foram os teóricos que deram suporte às análises das relações escola/universidade-sociedade, ensino-pesquisa-aprendizagem, conhecimentos populares-conhecimentos eruditos, conteúdo-forma, elementos de uma didática humanizadora, de matriz freireana. Foi possível perceber que práticas participativas ganham vida nos dois níveis de ensino, em movimentos nos quais os estudantes assumem a condição de sujeitos sociais, construindo e re-construindo as bases que podem sustentar uma didática humanizadora, lastreando a assunção de seus papéis sociais como sujeitos coletivos, com a capacidade de ler a realidade, interrogar-se e interrogá-la, realizando uma práxis transformadora.
Leader-Member Quality Relationship, Perceived Organizational Support and Employee Voice Behavior: Moderating Role of Core Self-Evaluation
Authors: Khair Qura-Tul-Aain
Published: June 2017

Abstract— The purpose of this research is to investigate the impact of relational exchange and individual differences on the employee voice. In the light of social exchange theory, the present study proposed the relationship between Leader-member quality relationships and employee voice. This study explains ‘how’ this relationship establishes and ‘why’ this relationship keeps carrying on. It has been proposed that perception of organizational support mediates the association between leader-member quality relationships and employees’ promotive and prohibitive voice behaviors. Moreover, personality trait is another important factor which is inseparable from developing perceptions and behaviors. The perceptions about organizational support and the strength of raising voice can be highly predictable by individual’s personality traits. So, this study has undertaken core self-evaluation as personality trait and explores people having different core self-evaluation (CSE) shows different strengths for promotive and prohibitive voicing based on leader-member quality relationships (LMQR) and perceived organizational support (POS). 

 

Index Terms-- Leader-member relationship, perceived organizational support, employee voice, core self-evaluation and social exchange theory
Toxic Effects of Water Soluble Fractions of Crude Oil, Diesel and Gasoline on Ceratophyllum Demersum
Authors: G.O. Eshagberi
Published: June 2017

Abstract- Oil exploration and exploitation has resulted in oil pollution in the Niger Delta. This study investigated the toxicity of water soluble fractions (WSFs) of crude oil, diesel fuel and gasoline on Ceratophyllum demersum (L).  The parameters measured include fresh weight, biomass production and relative growth rate.  The water soluble fractions concentrations used were 25%, 50% 100% for crude oil and diesel and 5%, 10%, 20% were used for gasoline.  Results from the study showed that at 25% WSF of crude oil and diesel fuel and 5% WSF of gasoline, there was significant increase (P < 0.05) in fresh weight, biomass production and relative growth rate of Ceratophyllum demersum. While increase in concentration resulted in decrease in the growth parameters.  High concentrations of Water Soluble Fractions of gasoline were the most toxic followed by diesel fuel. This study showed that low concentration of water soluble fractions of petroleum hydrocarbons enhanced growth while high concentration was toxic to the aquatic macrophyte. 

 Keywords: Crude oil, diesel, gasoline, Ceratophyllum demersum.
Seroprevalencia de infección por el virus de leucosis bovina durante 2015 en rodeos de cría de la Zona Deprimida del Río Salado, provincia de Buenos Aires, Argentina
Authors: Panei C. J. , Pérez Aguirreburualde M. S. , Echeverría M. G. , Galosi C. M. , Torres A. , Silva H. J. E.
Published: June 2017

La leucosis enzoótica bovina (LEB) es una enfermedad crónica, linfoproliferativa y altamente contagiosa producida por el virus de la leucosis bovina (VLB). La sangre es una fuente importante de infección, principalmente en la práctica veterinaria, considerando que solo 5 microlitros son suficientes para infectar a un bovino en forma experimental. La Zona Deprimida del Río Salado (ZDRS) está formada por poco más de 6 millones de hectáreas con una cantidad de terneros que representa el 16,05 % de las existencias nacionales y el 34,03 % de las provinciales, convirtiéndose, de ese modo,en la principal zona criadora de terneros de Argentina. Los últimos estudios sobre seroprevalencia de infección por el VLB en rodeos de cría en la provincia de Buenos Aires se realizaron hace poco más de 20 años, obteniéndose valores inferiores al 2 %. En este trabajo se analizaron un total de 1957 bovinos de cría provenientes de 90 establecimientos, representando poco más del 85 % de la superficie de la ZDRS, para determinar la presencia de anticuerpos contra el VLB mediante inmunodifusión en gel de agar, prueba utilizada en estudios epidemiológicos y en planes de erradicación de la enfermedad. La prevalencia en los establecimientos fue del 6,6 %,  mientras que se obtuvo una seroprevalencia individual de 0,36 %. Debido a que la ZDRS es la de mayor productividad de terneros de cría en Argentina, es de sumo interés determinar la prevalencia de infección en esta región para establecer zonas libres de VLB.
The Islamic concept of the Caliphate: basic principles and a contemporary interpretation
Authors: Sykiainen Leonid
Published: June 2017

This article studies the approach of Islamic legal thought to the idea of a Caliphate. The author explains the fundamental principles of the Islamic concept of the state as an instrument for defending and maintaining religion and dealing with worldly affairs. Modern Islamic thought, considering historical evolution of Islamic statehood under the influence of objective political circumstances, came to the key conclusion that an Islamic state is not restricted to a unified Caliphate (the Caliphate on the way of the prophecy). Other models of power are quite admissible if they meet the aims of the Caliphate.
Assessment of Biological and Antioxidant Capacities of Myrtuscommunis L. Leaf and Fruit Extracts from Mediterranean Region of Turkey
Authors: Gunyakti Ayse , Asan-Ozusaglam Meltem , Mujtaba Muhammad
Published: June 2017

Recently in humans and fishes most of the disease causing pathogenic microorganisms developed resistance against certain antimicrobial agents. This situation is causing both health and economic problems. In this context present study was designed to evaluate the antimicrobial and antioxidant activities of leaves and fruits of Myrtuscommunis. Antimicrobial activity of the plant’s leaf and fruit extracts was tested by using disc diffusion method against five fish, seven food-borne human pathogens and twoyeast strains. For this purpose, n-hexane and methanol an organic solvent were used for the obtaining the extract from dried leaves and fruit. The highest inhibition values was recorded as; for leaf n-hexane, leaf methanol and fruit n-hexane extracts against A. hydrophila ATCC 19570 fish pathogen as 24.59 mm, 21.76 mm and 23.78 mm, respectively while for fruit methanol extract against E. faecalis ATCC 29212 (human food-borne pathogen) as 16.61 mm. MBC and MFC results revealed that all extracts showed inhibitory activity against the entire test microorganisms. Methanol extracts exhibited higher antioxidant activity than n-hexane extracts. IC50 values were recorded in the range of 162.82-633.01 μg/mL and the highest activity was recorded for methanol extract (162.82 μg/mL). According to total antioxidant capacity method, the leaf methanol extract has been shown to have the highest activity as 115.91 mg AE/g.The highest activity (147.97mg TE/g) was found by the leaf methanol extract using FRAP method. Considering the results M. communis can be suggested as possible candidate for the extraction of natural and economic antimicrobial and antioxidant material.
Individuos sospechosos: microhistoria de un eclesiástico criollo y de un cirujano francés en la ciudad de México
Authors: Torres Puga Gabriel
Published: June 2017

El artículo presenta al lector fragmentos y representaciones de vida de dos sujetos muy disímiles cuyo denominador común fue el haber sido considerados como partícipes de la conspiración revolucionaria de 1794. A partir de los expedientes formados por la Sala del Crimen y el tribunal de la Inquisición, de una autobiografía y de un conjunto de cartas, el autor presenta un análisis microhistórico, acompañado de una reflexión historiográfica sobre las posibilidades y límites en la reconstrucción de trechos biográficos a partir de documentación judicial.
Sobre nuevo método de Gobierno espiritual de misiones de Californias, por fray Rafael Verger, 1772
Authors: Magaña Mancillas Mario Alberto
Published: June 2017

Como parte de las discusiones académicas acerca de la forma de realizar la historia social, cultural y demográfica de las comunidades misionales del septentrión novohispano, especialmente en el que se puede denominar el periodo colonial tardío, entre la expulsión de los jesuitas y el inicio de los movimientos armados de Independencia, se ha realizado un llamado a los estudiosos a incorporar a los grupos indígenas en dicha historia y alejarse de las visiones apologéticas de las labores evangelizadoras de los misioneros, especialmente de los franciscanos (observantes, misioneros y dieguinos), como si esa historia misional sólo fuera una historia del proceso evangelizador católico en esa amplia región y en ese periodo.
Culto y festividad a San Luis Rey en la colonia El Ajusco: un testimonio de religiosidad popular en la ciudad de México
Authors: González Pérez Damián
Published: June 2017

El presente trabajo tiene como propósito presentar una serie de entrevistas realizadas a la persona encargada de la organización de la festividad a San Luis Rey, en la colonia El Ajusco de la ciudad de México. A partir de las entrevistas puede observarse el origen del culto a dicha imagen y sus diferencias con respecto a la festividad original, llevada a cabo en el pueblo de Nahuatzen, en el estado de Michoacán; pero sobre todo, la relación que existe entre el santo y las personas que participan en su culto, mediante la fiesta, las promesas, los favores y los milagros de la imagen. Un aspecto significativo del trabajo es que aborda el tema del estado de una devoción popular a partir de los testimonios de un actor social específico, en un contexto urbano popular. Dicho actor es la señora Juana Maldonado Zúñiga, responsable de la organización de la fiesta a San Luis Rey en El Ajusco e hija de la fundadora de la festividad.
El huerto familiar, la milpa y el monte maya en las prácticas rituales y ceremoniales de las familias de X-Mejía, Hopelchén, Campeche
Authors: Cahuich Campos Diana , Huicochea Gómez Laura , Mariaca Méndez Ramón
Published: June 2017

Se presenta el estudio de la interrelación de ciertas prácticas rituales con los huertos, la milpa y el monte en X-Mejía, Hopelchén, Campeche. Con el análisis de las percepciones y prácticas rituales relacionadas con los sistemas productivos que hombres y mujeres realizan para preparar platillos, bebidas y dulces ceremoniales. Se muestra que el huerto y la milpa aportan más de 50 % de los ingredientes necesarios para realizar estos platillos, y que son indispensables los espacios físicos y socioculturales de este pueblo maya peninsular.
Anales de Cuauhtitlan, paleografía y traducción de Rafael Tena, Cien de México, México, Conaculta, 2011, 261 p.
Authors: Martínez Baracs Rodrigo
Published: June 2017

Rafael Tena, historiador, lingüista y nahuatlato mexicano, adscrito a la Dirección de Etnohistoria del INAH  ha logrado una tarea muy notable, que es la publicación por vez primera en una colección de divulgación de historia mexicana, la colección Cien de México que publica el Conaculta, de una serie de ediciones de textos históricos en lengua náhuatl, en ediciones bilingües, muy correctamente paleografiados, traducidos al español y editados.
Development of a metastatic risk model for cutaneous squamous cell carcinoma
Authors: Fosko Scott W , Chu Melinda B , Beal Brandon T , Dhandha Maulik , Armbrecht Eric S
Published: June 2017

Background: Cutaneous squamous cell carcinoma (cSCC) is the most common cancer capable of metastasis. Due to its high incidence and lack of inclusion in national databases it has been difficult to identify high-risk factors associate with metastasis. The development of a cSCC metastatic risk model would help physicians identify patients who are at risk for metastasis, and would allow for the initiation of early aggressive management to improve outcomes.Aim: Explore different statistical approaches to develop a model to predict cSCC metastasis that is accurate and reflects routine clinical practice.Methods: All cSCCs diagnosed and treated at Saint Louis University from January 2010 to March 2012 were included. Three statistical approaches were studied: multivariable logistic regression (MLR), pattern classification (PC) and sum score method (SSM).  Two models using the SSM were created with a different number of factors used to merit assignment to the metastatic cohort: 2 factors (S2) or >2 factors (S2+). For each model, sensitivity (SN), specificity (SP) and positive predictive value (PPV) were calculated.Results:  SN, SP, and PPV for each model were: MLR: SN 4.3%, SP 97.4%, PPV 16.0%; S2: SN 78.3%, SP 83.7%, PPV 12.5%; S2+: SN 60.9%, SP 96.5% PPV 34.1%; PC: SN 73.9%, SP 95.9%, PPV 34.7%. Conclusions: The PC model was the most accurate. The S2+ model had a lower SN, but would be easier to implement as clinicians would only have to sum high-risk factors.
A Rare Transition from Pemphigus Vulgaris to Pemphigus Foliaceus Following Rituximab Therapy Confirmed by Antidesmoglein ELISA
Authors: Haslam Samuel P , Woolridge Katelyn F , Wilkerson Michael G
Published: June 2017

Introduction:The phenotypic expression of pemphigus subtypes is mediated by differences in desmoglein (DSG) autoantibody profiles, a concept that is demonstrated in rare cases of transition between pemphigus subtypes. Diagnosis of transition is made on the basis of changes in classic phenotypic expression in conjugation with changes in immunofluorescence and/or antidesmoglein ELISA.Case Description:We report a 54-year-old male with a history of severe mucocutaenous pemphigus vulgaris (PV) brought into remission by treatment with systemic steroids and adjuvant rituximab infusions who re-presented approximately 1 year following steroid discontinuation with new crusted erosions covering the upper trunk and proximal extremities and notable absence of mucosal involvement. Antidesmoglein ELISA profile revealed an isolated rise in DSG-1 antibodies. Previous antidesmoglein ELISA profiles showed dual elevation in both DSG-1 and DSG-3 antibodies during active PV and absence of both DSG-1 and DSG-3 during disease remission.Discussion:The current case describes a rare transition from PV to pemphigus foliaceus (PF) following rituximab therapy as suspected clinically by classic phenotypic expression and confirmed serologically by antidesmoglein ELISA. This is only the second reported case of pemphigus transition following rituximab adjuvant therapy, and there are less than thirty cases of PV to PF transition reported in the literature. There is currently not a satisfactory explanation for the autoantibody shifting that is observed in transition between pemphigus types.
Acetylcholinesterase, Alpha-Glucosidase and Tyrosinase Inhibitors from Egyptian Propolis
Authors: Salah Nesma M. , Souleman Ahmed M.A. , Shaker Kamel H. , Hawary Seham El , El-Hady Faten K Abd
Published: June 2017

Bioassay guided fractionation led to the isolation of eight compounds from Egyptian Propolis. Hexacosanoic acid; 3,4-
dimethoxy-cinnamic acid; 3-methyl-3-butenyl-trans-caffeate ester; together with four flavonoids (Chrysin; Pinostrobin;
Tectochrysin and 5-hydroxy-7-methoxy isoflavone). 2,3-dihydroxy-4-methyl-octanoic acid; was isolated for the first time
from Egyptian propolis. Their acetylcholinesterase (AChE), alpha-glucosidase and tyrosinase inhibition potential were
evaluated. Pinostorbin showed the highest AChE inhibitory activity followed by 3,4-Dimethoxycinnamic acid; 3-methyl-
3-butenyl-trans-caffeate ester. Tectochrysin is the only compound had alpha-glucosidase inhibitory activity higher than
that of the drug acarabose. Pinostrobin is the only compound had mild tyrosinase inhibitory activity.
Chemical Constituents and Antioxidant Activity of a Polar Extract from Pituranthos battandieri Maire
Authors: Chahrazed Esseid , Hadjer Hamadou Meriem , Souad Ameddah , Menad Ahmed , Francisco León , Ignacio Brouard , Eric Marchioni , Samir Benayache , Fadila Benayache
Published: June 2017

Phytochemical investigation of the n-butanol soluble part of the aqueous-MeOH extract of the aerial parts of Pituranthos
battandieri Maire collected from the region of Bechar in the south-west of Algeria, led to the isolation and structural
elucidation of mannitol 1, xanthotoxol 2, 8-(6’,7’-dihydroxygeranyloxy)-psoralen 3 and isorhamnetin 3-O-ß-Dglucopyranoside
(cacticin) 4. The structures were established by spectral analyses, mainly ESI-HRMS, UV and NMR
experiments (
1H, 13C, DEPT, COSY, HSQC and HMBC) and comparison with literature data. All these compounds were
described for the first time from this endemic species. The free radical scavenging activity of this extract was determined
by 2,2-diphenyl-1-picrylhydrazyl (DPPH•
) and hydrogen peroxide (H2O2) scavenging activity models. Antihemolytic
property was performed using H2O2 induced red blood cell hemolysis model. Antiperoxidative effect was evaluated using
lipid peroxidation-ammonium thiocyanate model. Both DPPH and H2O2 assays indicated antioxidant ability of n-BuOH
extract of P. battandieri (BEPB), that were reflected by IC50 values 876.16±7.96 µg/mL and 603.8±71.06 µg/mL,
respectively. In addition, the results of the present study clearly indicated that BEPB inhibited rat erythrocytes hemolysis
induced by H2O2 in a dose dependent way with IC50 value 782.38±89.97 μg/mL. The inhibition of lipid peroxides generated
from linoleic acid was recorded at IC50: 496.04±117.06 µg/mL. The antiperoxidative and the antihemolytic activities of P.
battandieri appear as a consequence of synergistic interactions between active constituents among them mannitol 1, the
furanocoumarins 2 and 3, and the flavonoid 4.
The Effect of Helichrysum odoratissimum (L.) Sweet on Cancer Cell Proliferation and Cytokine Production
Authors: D. Twilley , N. Kishore , D. Meyer , I. Moodley , V. Kumar , N. Lall
Published: June 2017

The cytotoxicity of Helichrysum odoratissimum against human epidermoid carcinoma (A431), malignant melanoma
(A375), cervical epithelial carcinoma (HeLa) and human embryonic kidney (HEK-293) cells was investigated. The
cytokine production and antioxidant activity was also determined. H odoratissimum was selected based on its traditional
usage as a dressing for wounds. In this study the cytotoxicity was performed on skin and cervical cancer which are
associated with the presence of wounds. H. odoratissimum showed inhibitory activity against A431 cells, with a fifty
percent inhibitory concentration (IC50) of 15.5±0.2 µg/ml, and a high DPPH inhibition with an IC50 of 5.13±0.07 µg/ml.
A431 cells treated with the extract showed an increase in morphological characteristics associated with apoptosis. The
extract induced IL-12 in U937 cells and inhibited IL-8 at the tested concentrations, with the highest levels being 12.4±7
pg/ml and 103±6.1 pg/ml respectively. IL-2 was inhibited by 56 % and 52 % in naive and PHA induced murine splenocytes
respectively. Furthermore, 2 lipophilic fractions and 3 compounds were isolated from the extract. The lipophilic fractions
showed relative cytotoxicity on A431 cells with IC50 values of 175±13.5 µg/ml and 61.3±0.16 µg/ml. The extract showed
significant hepatoprotection at 25 µg/ml on HepG2 cells exposed to D-Galactosamine. This is the first report of the activity
of H. odoratissimum ethanolic leaf stem extract on A431, A375, HeLa and HEK-293 cell lines as well as the isolation of
two promising lipophilic fractions.
Thin Layer Chromatographic Characterization of Carotenoid Isolates in Sugar Date Palm (Phoenix sylvestris) Fruit Epicarp and Inflorescence Axis
Authors: Das Susmita , Gupta Poulami , De Bratati
Published: June 2017

Plant carotenoids are one of the most important classes of plant pigments and play a crucial role in defining the quality
parameter of fruits and vegetables. They possess a large numbers of important biological activities such as antioxidant
properties, anti – carcinogenic, precursor of vitamin A and preventive in a large number of chronic diseases. The
objective of the present study was to characterize the carotenoids present in Phoenix sylvestris fruits and their
inflorescence axis which are orange red in colour. So, in this study we isolated carotenoids from both the epicarp and the
extensively large inflorescence axis by preparative TLC and also characterized some of the major components like β-
carotene and lutein using HPTLC analytical techniques. The present findings suggest that the consumption of β-carotene
and lutein from this fruit crop can be helpful in providing potential targets for combating vitamin A deficiency in
countries where vitamin A deficiency is a public health problem
Molecular Strategies for Morphology Control in Semiconducting Polymers for Optoelectronics
Authors: Rahmanudin Aiman , Sivula Kevin
Published: June 2017

Solution-processable semiconducting polymers have been explored over the last decades for their potential applications in inexpensively fabricated transistors, diodes and photovoltaic cells. However, a remaining challenge in the field is to control the solid-state self-assembly of polymer
chains in thin films devices, as the aspects of (semi)crystallinity, grain boundaries, and chain entanglement can drastically affect intra-and inter-molecular charge transport/transfer and thus device performance. In this short review we examine how the aspects of molecular weight and chain
rigidity affect solid-state self-assembly and highlight molecular engineering strategies to tune thin film morphology. Side chain engineering, flexibly linking conjugation segments, and block co-polymer strategies are specifically discussed with respect to their effect on field effect charge
carrier mobility in transistors and power conversion efficiency in solar cells. Example systems are taken from recent literature including work from our laboratories to illustrate the potential of molecular engineering semiconducting polymers.