bluuebunny/crossref_metadata_2025 huggingface dataset:
Bar Classification Based on the Potential Map
Authors: Lee Yun Hee , Park Myeong-Gu , Ann Hong Bae , Kim Taehyun , Seo Woo-Young
Published: August 2020

We introduce a new approach to classify barred galaxies that utilizes the transverse-to-radial force ratio map (ratio map, hereafter) in a different manner from previous studies. When we display the ratio map in polar coordinates, barred galaxies appear as four aligned, horizontal thick slabs. This characteristic feature enables us to successfully classify barred and nonbarred galaxies with an accuracy of 87%. It yields a bar fraction of 53%, including both SBs and SABs, when applied to 884 nearby (z < 0.01) spiral galaxies from the Sloan Digital Sky Survey/DR7. It also provides the bar strength and length measurements, in particular, separated from the spiral arms. They show good correlations with the measures estimated from ellipse fitting and Fourier analysis. However, we find different tendencies of the bar strength measurements in terms of the Hubble sequence: as the Hubble sequence increases (toward late types), the bar strength and bar ellipticity increase, whereas the dipole Fourier amplitude decreases. We show that the bulge affects the estimation of the bar strength differently, depending on the classification methods. The bulge causes the bar length to be overestimated in all three methods. Meanwhile, we find that barred galaxies show two types of radial profiles of the angle-averaged force ratio: one has a maximum peak (type M) and the other a plateau (type P). Comparison with numerical simulations suggests that type-M bars are more mature than type-P bars in terms of evolutionary stage.
Testing the Kerr Black Hole Hypothesis Using X-Ray Reflection Spectroscopy and a Thin Disk Model with Finite Thickness
Authors: Abdikamalov Askar B. , Ayzenberg Dimitry , Bambi Cosimo , Dauser Thomas , García Javier A. , Nampalliwar Sourabh , Tripathi Ashutosh , Zhou Menglei
Published: August 2020

X-ray reflection spectroscopy is a powerful tool for probing the strong gravity region of black holes and can be used for testing general relativity in the strong field regime. Simplifications of the available relativistic reflection models limit the capability of performing accurate measurements of the properties of black holes. In this paper, we present an extension of the model relxill_nk in which the accretion disk has a finite thickness rather than being infinitesimally thin. We employ the accretion disk geometry proposed by Taylor & Reynolds and we construct relativistic reflection models for different values of the mass accretion rate of the black hole. We apply the new model to high-quality Suzaku data of the X-ray binary GRS 1915+105 to explore the impact of the thickness of the disk on tests of the Kerr metric.
Intrinsic Morphology of Ultra-diffuse Galaxies
Authors: Rong Yu , Dong Xiao-Yu , Puzia Thomas H. , Galaz Gaspar , Sánchez-Janssen Ruben , Cao Tianwen , van der Burg Remco F. J. , Sifón Cristóbal , Mancera Piña Pavel E. , Marcelo Mora , D’Ago Giuseppe , Zhang Hong-Xin , Johnston Evelyn J. , Eigenthaler Paul
Published: August 2020

With the published data of apparent axis ratios for 1109 ultra-diffuse galaxies (UDGs) located in 17 low-redshift (z ∼ 0.020–0.063) galaxy clusters and 84 UDGs in two intermediate-redshift (z ∼ 0.308–0.348) clusters, we take advantage of a Markov Chain Monte Carlo approach and assume a triaxial model to investigate the intrinsic morphologies of UDGs. In contrast to the conclusion of Burkert, i.e., the underlying shapes of UDGs are purely prolate (C = B < A), we find that the data favor the oblate-triaxial models (i.e., thick disks with

) over the nearly prolate ones. We also find that the intrinsic morphologies of UDGs are related to their stellar masses/luminosities, environments, and redshifts. First, the more luminous UDGs have puffier morphologies compared with the less luminous counterparts; the UDG morphologic dependence on luminosity is distinct from that of the typical quiescent dwarf ellipticals (dEs) and dwarf spheroidals (dSphs); in this sense, UDGs may not be simply treated as an extension of the dE/dSph class with similar evolutionary histories; they may differ not only in size. Second, the UDGs with smaller clustercentric distances are more puffed up, compared with the counterparts with larger clustercentric distances; in combination with the UDG thickness dependence on luminosity, the puffier morphologies of UDGs with high luminosities or located in the denser environments are very likely to be attributed to tidal interactions with massive galaxies. Third, we find that the intermediate-redshift UDGs are more flattened, compared with the low-redshift counterparts, which plausibly suggests a “disky” origin for the high-redshift, newly born UDGs.
Niviventer confucianus sacer (Rodentia, Muridae) is a distinct species based on molecular, karyotyping, and morphological evidence
Authors: Li Yaoyao , Li Yiqiao , Li Haotian , Wang Jing , Rong Xiaoxiao , Li Yuchun
Published: August 2020

Niviventer confucianus sacer Thomas, 1908, which has been regarded as a subspecies of N. confucianus, was found to be a distinct species from N. confucianus based on molecular, karyotyping, and morphological characteristics in this study. Niviventer c. sacer was found to belong to a distinct phylogenetic clade in phylogenetic tree constructed using the mitochondrial gene Cytb, it clustered with N. bukit (Bonhote, 1903) from Vietnam and N. confucianus (Milne-Edwards, 1871) from Yunnan, but showed a distant relationship with N. confucianus from adjacent areas. The genetic distance between N. c. sacer and N. confucianus was more than 5.8%, reaching the level of interspecific differentiation. The species delimitation indicates that N. c. sacer is a monophyletic group. The karyotype of N. c. sacer (FN = 55, 8m+4st+32t+X(sm)Y(t)) differed from that of N. confucianus (FN = 59, 6m+4sm+2st+32t+X(sm)Y(t)). In terms of morphological features, the length of incisive foramen (LIF) and length of auditory bulla (LAB) of N. c. sacer is significantly larger than that of N. confucianus and N. bukit (P < 0.05) and the proportion of white tail tip to total tail length is significantly longer at N. c. sacer (≥ 1/3) than that at N. confucianus (≤ 1/3). Therefore, integrated analysis confirmed that N. c. sacer is a distinct species of genus Niviventer rather than a subspecies of N. confucianus or N. bukit, namely N. sacer, which is only distributed in Shandong.
DNA barcoding and hypopygium shape support delimitation of sympatric Dissomphalus species (Hymenoptera, Bethylidae) from the Atlantic rainforest
Authors: Monjardim Marina , Azevedo Celso O. , Fagundes Valeria
Published: August 2020

Dissomphalus is a cosmopolitan genus of Bethylidae and has 269 Neotropical species divided into 32 species-groups, mostly defined by the genital and the tergal process structures. Dissomphalus rectilineus and D. concavatus are sympatric species in the ulceratus species-group. Members of the species-group share many similarities in the morphology of the head, hypopygium, tergal process and genitalia, but may be distinguished by the structure of the hypopygium. Previous studies have found intermediate structures of the hypopygium in the sympatric areas and raised questions about the distinctiveness of these two species. We sequenced 340 bp of the mitochondrial gene cytochrome oxidase I of 29 specimens from Brazil and Paraguay, calculated the genetic divergence among specimens, and recovered the phylogenetic relationships between taxa. In addition, we compared the morphology of the hypopygium to evaluate its use as a species-specific diagnostic character using the genetic divergence values. We recovered three well-supported monophyletic groups (intraclade divergence from 1.3 to 13.4%) and three hypopygium morphologies associated with each clade, two of them associated with D. rectilineus and D. concavatus (as described in the literature); the third one is new, not associated with any known species. The divergence between the D. rectilineus and D. concavatus clades was 19%, while the third clade is divergent from each species by 19–20%. If fully described, the hypopygium shape associated with the COI sequence will represent an extremely promising approach to the diagnosis of Dissomphalus species.
« Mon bébé ne dort pas » : quelle écoute, quel soutien ?
Authors: Zaoui-Grattepanche Catherine
Published: August 2020

La perception et l’accompagnement du sommeil du bébé et de l’enfant sont éminemment variables d’une culture, d’une époque et d’une famille  à l’autre… Soutenir  des parents en difficulté avec le sommeil de leur enfant nécessite une écoute attentive  et la prise en compte de leurs perceptions, représentations et problématiques sous-jacentes.
Petits et gros bobos du sommeil
Authors: Genet Christine
Published: August 2020

Le sommeil du tout-petit évolue au rythme de sa croissance, et il peut se dérégler sous l’effet de divers facteurs somatiques, relationnels et/ou environnementaux. Les troubles du sommeil du petit enfant ont un impact majeur sur son développement, sa santé et sur la qualité des interactions avec les parents, notamment en ce qui concerne le lien d’attachement ; il est primordial de les évaluer et de les traiter le plus tôt possible, par des actions de psychoéducation, de guidance interactive, voire de soin médical si besoin. Il est également important d’évaluer le degré de fatigue parentale, qui peut entraver la prise en charge.
Le sommeil : une histoire de cadre
Authors: Salaün Céline
Published: August 2020

Dans notre société, culturellement depuis plusieurs décennies les parents souhaitent la plupart du temps que leur enfant s’endorme rapidement seul. L’apprentissage du sommeil s’est fait pendant longtemps dans les pleurs, avec différentes méthodes que l’on essaie aujourd’hui d’actualiser à la lumière des dernières connaissances en neurosciences sur le développement du cerveau. Aujourd’hui, dans nos cours sur la parentalité, nous essayons de véhiculer ce regard sur le sommeil. Si le sommeil de l’enfant pose question, c’est bien l’attitude du parent qui devra apporter une réponse rassurante. Encore doit-il connaître les besoins du bébé et proposer le cadre qui sera le plus sécurisant et cohérent.
Les nuits du bébé allaité… et de ses parents
Authors: Didierjean-Jouveau Claude
Published: August 2020

Quand une mère qui allaite se plaint d’être fatiguée, de mal dormir, d’être réveillée par son bébé, il est fréquent qu’on lui réponde : « Passe au biberon, il dormira mieux », « donne-lui un biberon le soir, il ne se réveillera plus », « laisse-le pleurer un peu, il faut qu’il apprenne à faire ses nuits », etc. L’idée est bien ancrée chez nous que les bébés allaités (et leurs parents) dorment moins et moins bien que les bébés nourris au biberon. Pourtant, nombreuses sont les études montrant que les mères qui allaitent bénéficient en fait d’un meilleur sommeil, que ce soit en durée ou en qualité (plus de sommeil profond, plus réparateur).
The Emerging Issues and Impacts of Technology in Classroom Learning
Authors: Wali Ahmad Zahir , Popal Ahmad Wali
Published: August 2020

This study investigates the technological trends used in the classes of post graduate students of education faculy, UiTM. It also explores the perceptions of the students on impacts and emerging issues of technology on their classroom learning. The study has employed a quantitative research design and has used a questionnaire as a research method to collect data. The data was collected from a sample of 30 post graduate students of Education Faculty, University Teknology Mara (UiTM). The findings show that social media, gamification, blended learning, E-books, remote learning and self directed professional development are the technological trends used in post graduate classes of Education faculty, UiTM. The findings also indicate that technology has positively influenced the classroom learning of these students. Lastly, the results show that technology is not perceived as an emerging issue that would interfere or hinder the students learning in the classroom.
On the Issue of Compliance with Didactic Principles in Learning using Augmented Reality
Authors: Nurbekova Zhanat , Baigusheva Bayan
Published: August 2020

Augmented Reality, as one of the advanced technologies, in-creases the range of applications in various spheres of life every year. The evo-lution of the development and application of augmented reality in various spheres has shown its effectiveness also for the sphere of education. The analysis of varied studies shows the expanding penetration of augmented reality in education, while noting the positive impact of augmented reality on the quality of education. However, the didactic approach to the application of augmented reality in education has not yet been sufficiently studied. The article considers the use of digital educational resources with augmented reality as a didactic teaching tool. In addition, a system of didactic principles for learning using augmented reality is proposed.
Twitter Sentiment Analysis Approaches: A Survey
Authors: Adwan Omar Yousef , Al-Tawil Marwan , Huneiti Ammar , Shahin Rawan , Abu Zayed Abeer , Al-Dibsi Razan
Published: August 2020

Twitter is one of the most popular microblogging and social networking platforms where massive instant messages (i.e. tweets) are posted every day. Twitter sentiment analysis tackles the problem of analyzing users’ tweets in terms of thoughts, interests and opinions in a variety of contexts and domains. Such analysis can be valuable for several researchers and applications that require understanding people views about a particular topic or event. The study carried out in this paper provides an overview of the algorithms and approaches that have been used for sentiment analysis in twitter. The reviewed articles are categories into four categories based on the approach they use. Furthermore, we discuss directions for future research on how twitter sentiment analysis approaches can utilize theories and technologies from other fields such cognitive science, semantic Web, big data and visualization.
A Four-in-one Teaching Model for Fundamental Nursing Based on UCD Theory
Authors: Li Pan , Li Chunyan
Published: August 2020

With the change of health concept and medical mode, the nursing personnel in the 21st century will confront day by day expanding work domain, and new opportunities and challenges put forward new requirements for the scale and quality of nursing personnel training. The core problem of nursing education reform is course reform. At present, nursing specialty teaching has such problems as the lack of learning initiative and imperfect course evaluation system which seriously affect the teaching effect. Hence, this study applied UCD theory, summarized the principles of multimedia teaching design based on UCD theory, and applied it in network course design of nursing teaching. The detailed design application method expanded in detail from three aspects: course process, course content and course experience. Meanwhile, four-in-one (blended-flipped-autonomous-collaborative) teaching model was proposed. The teaching model is based on the functional structure relation between course objective and course implementation process, and element analysis model of course quality process. The course quality evaluation index system oriented to objective-process was constructed from six dimensions (including course objective adaptation, teaching resource guarantee, teaching program execution, teaching program suitability, quality assurance effectiveness and course objective attainment) to assess the application effect of four-in-one teaching model in Fundamental Nursing. The results show that the four-in-one teaching model better improves students’ self-management ability, information acquisition ability, learning and cooperation ability, compared with traditional teaching models. Objective-process course quality evaluation index system can quantify evaluation of teaching effect from multiple dimensions and make teachers optimize course design with pertinence.
A Teaching Model for College Learners of Japanese Based on Online Learning
Authors: Jin Dongmei , Li Yiping
Published: August 2020

Online learning has not been fully implemented by college Japanese teach-ers, due to the lack of supports from intelligent technology and the poor de-cision-making of college management. This paper attempts to develop a teaching model that effectively integrates online learning to enhance the learning ability of Japanese among college students. To begin with, the au-thors summarized the status quo, impacts, and problems of online learning among Japanese learners in colleges. Through expert survey and literature review, an index system was established to measure the online learning abil-ity of Japanese among college students. The weight of each index was de-termined by analytic hierarchy process (AHP). Based on index system, a grey relational analysis (GRA) model was set up to evaluate the online learn-ing ability of Japanese among college students. The research results provide a good reference for the online learning of other language majors.
Ubiquitous Learning Environment for Smart Improving Disruption Activities in Classroom on Media
Authors: Ashar Muhammad , Rosyid Harits Ar , Taufani Agusta Rahmat , Nasir Khaidir Rahman
Published: August 2020

Smart learning emphasizes the educational needs of students learning to grow smarter as a result of an intelligent environment. Universities should have the right strategy through the utilization of limited resources, especially with regard to human resources. Objective research offers the benefits of learning in the form of influence over these resources are limited and focused on the use of online learning to support learning through class room facility improvements with a medium of learning through virtual environments and utilize technology and multimedia content adaftive cameras in some areas. The research method using descriptive experimental method in the fifth stage of design and product development of mobile applications in the form of a waterfall model through a needs analysis devices and digital facilities
Factors that interfer in the quality of service to the critical patient
Authors: Santana Rosane da Silva , Dias Eva Maria dos Santos , Oliveira Gualbitânia de Sousa , Batista Camila de Araújo , Frota Cynthia Araújo , Silva Ronnara Kauênia da , Santos Claudiane de Oliveira , Silva Francisca Jéssica Abreu da
Published: August 2020

The objective was to identify the factors that interfere with the quality of nurses' care to patients in the urgency and emergency service. This is a qualitative, exploratory and descriptive study, conducted in the months of September to November 2017 with 16 nurses, in the critical sectors of a public hospital referral in urgency and emergency in Teresina, Piaui, Brazil. The main factors identified that interfere with the quality of care provided by nurses were: inadequate conditions at work, improper physical structure in meeting high demand from patients, insufficient materials and equipment, dimensioning of inadequate personnel, in addition to a health care network that finds problems to achieve adequate patient flow. It is noted the need to develop institutional programs in the study hospital, in order to value and motivate the assisting professionals, since exposure to constant negative feelings can trigger physical and mental illnesses, in addition to exerting a great influence on the quality of the patients. services that are provided.
Linear mixed model for weight analysis in mice infected by Trypanosoma cruzi
Authors: Pereira Roney Peterson , Guedes Terezinha Aparecida , Ferreira Érika Cristina , Araújo Silvana Marques  de , Ricardini Larissa Aparecida , Ciupa Larissa
Published: August 2020

The use of linear mixed models for nested structure longitudinal data is called hierarchical linear modeling. This modeling takes into account the dependence of existing data within each level and between hierarchical levels. The process of modeling, estimating and analyzing diagnoses was illustrated through data on the weights of mice experimentally infected by Trypanosoma cruzi, divided into different treatment groups, with the purpose of verifying the evolution of their body weight as a result of using different types of biotherapeutics produced from Gallus gallus domesticus (chicken) serum to treat Trypanosoma cruzi. Through the model selection criteria AIC and BIC and the likelihood ratio test, a model was chosen to describe the data correctly. Model diagnoses were then performed by means of residual analysis for both levels and an analysis of influential observations to verify if any observations were signaled as influencing the fixed effects, the components of variance and the adjusted values. After the analysis, it was possible to notice that the observations that were signaled as influential had little impact on the Model chosen initially, so it was maintained, with no differences being evidenced between the treatments with the biotherapeutics tested; only the Time variable and the Random intercept were necessary to describe the weight of the mice.
Occurrence of Mycoplasma spp. and Ureaplasma spp. in genital specimens
Authors: Santos Nathally Claudiane de Souza , Scodro Regiane Bertin de Lima , Andrade Vanessa Tatiana de , Siqueira Vera Lucia Dias , Caleffi-Ferracioli Katiany Rizziere , Pádua Rubia Andreia Falleiros de , Micheletti Daniela Ferrari , Cardoso Rosilene Fressatti
Published: August 2020

Mycoplasma spp. and Ureaplasma spp. belong to humans’ genitourinary microbiota and sometimes are associated with infections of the genitourinary tract. The aim of this study was to evaluate the occurrence of Mycoplasma spp. and Ureaplasma spp. in genital specimens from patients of the 15th Regional de Saúde of Paraná State, Brazil, and to correlate the results with clinical and laboratory data. A retrospective cross-sectional study was conducted, based on the analysis of results of vaginal, endocervical, urine and urethral culture for mycoplasmas from patients attended in a reference laboratory, from January 2009 to December 2016. We evaluated 2,475 results of culture for mycoplasmas. A total of 50.8% patients were positive for mycoplasmas. Of these, 76.8% had positive culture exclusively for Ureaplasma spp. and 4.7% for Mycoplasma hominis. Both microorganisms were isolated in the microbiology culture of 18.5% of patients. Among the positive culture, 81.4% had significant concentrations. Bacterial vaginosis was the most common alteration observed in association with mycoplasmas. The high positivity of cultures for mycoplasmas, especially Ureaplasma spp. found in our study, highlight the presence of these microorganisms in many of the genital tract disorders that can be sexually transmitted and, consequently, should not be neglected.
Jair Messias Bolsonaro:
Authors: Alencar Gedeon Freire de
Published: August 2020

O atual presidente do Brasil foi eleito com apoio majoritário de lideranças religiosas, assim, ele e seus apoiadores, entendem que foi “escolhido por Deus”. A  ideia é que uma soberania divina controla e decide tudo, assim, a realidade é resultado, portanto, de um plano divino. Deus elege, controla e governa através de um “escolhido”.  Usando a teorização weberiana da ação e interesse humano e o conceito do sociólogo Pierucci da “religião como solvente” veremos que as razões e motivações politicas podem ser mimetizadas como ações divinas.
Epistemologia pentecostal e presença política
Authors: Cazotto Terra Kenner
Published: August 2020

O movimento pentecostal é um fenômeno moderno, multifacetado, plural e global. Como resultado de diversas tradições e experiências cristãs, representa, paradoxalmente, continuidades e descontinuidades de teologias e tradições. Por isso, o Pentecostalismo e os movimentos carismáticos se inserem no conjunto maior da cristandade e dos movimentos cristãos contemporâneos. Entre tantos pontos fundamentais que compõem esses complexos e contemporâneos grupos cristãos, o acesso não mediado a Deus, a pneumatologia carismática, a crença na irrupção sobrenatural no mundo, a valorização da afetividade e partilha comunitária são seus pontos comuns. O fenômeno pentecostal representa uma fé vivencial, cuja presença do Espírito com dons, sinais e glossolalia revela outra racionalidade à desenvolvida na modernidade racionalista, o que faz da compreensão carismático-pentecostal uma contracultura intelectual, tornando sua visão de mundo uma diferente opção (mesmo que de dentro da própria modernidade) ao racionalismo moderno. Harvey Cox diria que o movimento pentecostal representa o preenchimento do Déficit extático deixado por grande parte do Protestantismo dos séculos XVIII-XX. À vista disso, mostrar-se-á o lócus da compreensão pentecostal a respeito da realidade e suas propostas teológicas. Assim, o ethos carismático-pentecostal será apresentado como experiencial e místico, significando uma crítica à epistemologia desenvolvida no pensamento metafísico e impulso para a presença política no locus público.
Governo Bolsonaro e o apoio religioso como bandeira política
Authors: Oliveira Fábio Falcão
Published: August 2020

O presente artigo tem como finalidade apresentar a aproximação de Jair Bolsonaro com a bancada evangélica. Neste sentido, usaremos autores como Almeida (2019) e Alves (2017). Outras fontes podem aparecer no artigo que visa mostrar como o governo de Jair Bolsonaro se aproveitou do crescimento das igrejas evangélicas para forma seu populismo evangélico. Posição religiosa que se choca com seu governo conturbado. Com isto observaremos que o favorecimento da bancada evangélica é algo comum no governo que busca uma hegemonia política. O Brasil se depara com um discurso de ódio velado que muitos sem base cultural, histórica e literária acabam assumido a proposta desencontrada do governo.
Application of Photocatalytic and Adsorption Process for Residue Organic Degradation Using Doped ZnO Composites Hydrogel Beads
Authors: Sangjan Suntree , Thongsamer Wadchara
Published: August 2020

This research aimes to synthesize photocatalyst-sodium alginate composite hydrogel beads which apply for coupled adsorption and photocatalytic degradation of organic residue. Fe3O4, graphitic carbon nitride (g-C3N4), grapheme oxide (GO) and AgNO3 doped ZnO photocatalyst composites hydrogel beads were synthesized and characterized using Fourier-transform infrared spectroscopy (FT-IR), X-ray Diffraction (XRD), and Transmission Electron Microscopy (TEM). Photocatalytic and adsorption activity are studied by Methylene blue (MB) degradation under sunshine irradiation. The effect of different parameter as photocatalyst types and reaction time were studied upon the efficiency of organic residue degradation. The coupled photocatalytic and adsorption processes were evaluated through various kinetic models such as pseudo-first-order/ pseudo-second-order in Langmuir-Hinshelwood model model, the Elovich model and the intra particle diffusion model. Kinetics studies showed that the coupled photocatalytic and adsorption processes in photodegradation of all sample was well described by the pseudo-second-order model because R2 of all sample were close to 1 which compared with another model. For photodegradation efficiency, the best choice in this condition was g-C3N4 doped ZnO composite hydrogel bead. Photodegradation efficiency and the pseudo second order rate constant of photocatalyst ZnO+gC3N4/SA composite hydrogel bead were 83.80%(for 180 min and up to 96% for 7 hr) and 5.05×10-3 g.mg-1 min-1, respectively.
Influence of Reinforcement Fiberglass Grids Used in Asphalt Pavement on the Bonding of Layers
Authors: Sachr Jiří , Dasek Ondrej , Stoklasek Svatopluk
Published: August 2020

The paper deals with the influence of geosynthetic reinforcement systems on the quality of asphalt bonding layers. A reinforcing element in the form of a fiberglass grid is incorporated into the road structure between two asphalt layers to prevent the formation of cracks and to reduce the tendency of their subsequent propagation throughout the asphalt layers. At the same time, however, they form a potential weak interlayer on which adjacent asphalt layers may slip. The total 90 drilled cores taken from a laboratory-produced two-layer slabs were subjected to the Leutner shear test. The selection of individual specimens took into account both the type of reinforcement element and the amount of applied bituminous emulsion.
Stress-Strain Properties of Engineered Cementitious Composites (ECC) Exposed to Sulfate Dry-Wet Cycle
Authors: Han Yu Dong , Wang Zhen Bo , Hong Zi Jie , Zuo Jian Ping , Liu Chang , Zhang Zi Shan
Published: August 2020

The brittleness and easiness to crack expose marine concrete to serious durability issues. Engineered Cementitious Composites (ECC), as a new generation of ultra high performance concrete, is expected to overcome the strain-softening properties of traditional concrete and realize function of crack-width control. In this paper, the sulfate erosion of ECC under drying-wetting cycles was modelled in laboratory test. And the compression test on cylinders after exposure to different erosion cycles was implemented to obtain the stress-strain properties. The results disclose that sulfate erosion imposes significant influence on both the nonlinear ascending and descending portions of the stress-strain properties of ECC. As the erosion period extended, ECC strength undergoes an obvious increase. And the descending section of the eroded ECC shows a significant stress drop, which is quite different from that before erosion. Additionally, a simple analytical model was proposed to provide satisfactory prediction of the stress-strain properties of ECC exposed to sulfate erosion.
Ultrasonic Welding of Glass Fiber Reinforced PP Thermoplastic Composites: An Investigation of the Outer Layer Orientation and the Fiber Volume Fraction
Authors: Alrubaie Murtada Abass A.
Published: August 2020

This paper presents an experimental study of the influence of the orientation of the outer layer of polypropeylene (PP) reinforced with E-glass fiber laminate (GF/PP) and the influence of the fiber volume fraction on the quality of the welded joint using an ultrasonic welding process. An orthogonal L 16 array (OA) design of experiment was conducted in this paper based on the Taguchi method to evaluate the effect of the orientation of the outer layer and the fiber volume fraction, on the welding process parameters; the welding energy, the amplitude of vibration, the welding pressure, the holding pressure and the holding time were considered in order to achieve a high weld quality. The experiments were carried out using a 15 kHz ultrasonic welding unit with a maximum supplied power of 4000-Watt. GF/PP laminates with fiber volume fraction of 36% and 46% were used in this paper, and the GF/PP laminates were either unidierctional or had a 90 degree outer layer orienation. A 0.127 mm thick polypropeylene film was used as a flat energy director (ED). The evaluation of the weld quality was measured by the apparent shear strength of the single lap welded joints, and by using laser shearography as a non-destructive inspection technique . The failure mechanism of the single lap joint was monitored, using a high speed digital imaging system. A combination of the highest selected level of welding energy, lowest level of amplitude, lowest level of welding pressure, and the lowest level of both hold time and hold pressure of a unidirectional GF/PP with the lowest fiber volume fraction, were found to achieve a higher apparent shear strength of the welded adherends, as compared with the apparent shear strength obtained with the presence of the flat energy director for the same level of factors. A confirmation experiment was conducted to measure the predicted apparent shear strength and compare it with the measured apparent shear strength from the test.
Drying Characteristics of Chlorella pyrenoidosa Using Oven and its Evaluation for Bio-Ethanol Production
Authors: Megawati Megawati , Damayanti Astrilia , Putri Radenrara Dewi Artanti , Pradnya Irene Nindita , Yahya Habib Faisal , Arnan Nurul Kumarany
Published: August 2020

The objective of this research is to study the influence of temperature on drying and changes in carbohydrate composition during the drying. Chlorella pyrenoidosa was dried in oven at various temperatures and initial weight 2 g. The initial moisture content of Chlorella pyrenoidosa was 487.2% dry weight and the composition was hemicellulose (62.76), cellulose (2.39), and lignin (0.46% dry weight). Every 5 min, the moisture content was recorded. The critical moisture contents of Chlorella pyrenoidosa at 50, 60, and 70 °C are 7.2, 3.9, and 3.1% dry weight, respectively. Meanwhile, the equilibrium water contents are 0.53, 0.32, and 0.12% dry weight, respectively. The carbohydrate content in Chlorella pyrenoidosa cell as a result FTIR analysis indicates that the higher temperature of drying the carbohydrate content increases. Drying of Chlorella pyrenoidosa at temperatures of 50, 60, and 70 °C will decrease moisture content without disturb carbohydrate molecule, so the carbohydrate content increases. Therefore, drying of Chlorella pyrenoidosa before converting become bio-ethanol will give benefit to increase the carbohydrate content and initial rupturing of it’s cell.
Non-Destructive Detection of GIS Aluminum Alloy Shell Weld Based on Oblique Incidence Full Focus Method
Authors: Wang Xin Xin , He Cheng , Zhao Pu-zhi , Zheng Yi , Jiang Shi Hao , Wei Yan Ding
Published: August 2020

In this paper, a new ultrasonic phased array full focus imaging method based on oblique incidence is proposed to solve the problem of the non-destructive testing of the internal defects in the GIS (gas insulated switchgear) shell welds. By using wedge coupling, the measured weld is far away from the near-field range of the transducer, and the detection angle range can be increased by changing the propagation direction of the acoustic beam. Based on Snell's law, the propagation characteristics of the ultrasonic wave in the interface are studied. On the basis of the conventional ultrasonic array matrix and the full focus imaging algorithm, by introducing the energy attenuation calibration coefficient of the acoustic wave propagation through the wedge, the correction amplitude of the specific focus point p(x, z) is obtained, The non-destructive testing of weld defects of GIS shell in the spot is carried out, and the test results show that the qualitative and quantitative detection of the weld defects can be well realized by using this method.
Roll Casting and Die Casting of Si-Added Al-Mg Alloy
Authors: Haga Toshio , Imamura Shinichiro , Fuse Hiroshi , Watari Hisaki , Nishida Shinichi
Published: August 2020

Si ranging from 0.2 mass% to 2.0 mass% was added to Al-5%Mg alloy (5182) and strip was cast by a vertical type high-speed twin-roll caster at a speed of 80 m/min. The as-cast strip was cold-rolled down to 1 mm thickness and annealed. The mechanical properties were investigated using cup tests and tension tests. The limiting draw ratio (LDR) of the 5182 alloy was 2.0 and the LDR became smaller as the Si content increased. When the Si content was 2.0 mass%, the LDR was 1.8, which shows that Si-added 5182 can be used for sheet forming, if the Si content is less than 2.0 mass%. The tensile strength and elongation were almost constant when the Si content was less than 1 mass%, but decreased at 2.0 mass% Si. However, the elongation was greater than 20% at 2.0 mass% Si. For die casting, 2.0 mass% Si was determined as the appropriate content from the results of the tension tests. When the Si content is in the range from 1.0 mass% to 2.0 mass%, then the Si added Al-5%Mg has the ability to be used for both die casting and sheet forming.
Bioactive Membranes of Polymeric Micro and Nanocomposites Prepared with the Natural Anionic Marine Polysaccharide (Alginate) Functionalized with Extracts of Cat’s Claw (Uncaria tomentosa) and Aloe vera
Authors: Kim Suyeon , Elgegren Mariela , Donaryre Alonso , Galaretta Betty , Nakamatsu Javier
Published: August 2020

In this research, the nanostructured alginate (AL) membranes were prepared with natural bioactive compound, Cat's claw (Uncaria tomentosa) extract (UT). UT is broadly used as an anti-inflammatory agent and the effect on the treatment of Rheumatism was proved by many scientists. For this reason, we added this bioactive compound in the process of AL membrane formulation to improve the biological activities. 2-dimentional (2-D) and 3-dimentional (3-D) AL membranes were prepared with and without addition of UT extracts. 3-D AL membranes were prepared using ultrasound with high intensity. The wettability of AL membranes depending on the concentration of AL was studied by measuring contact angle and surface energy. Stabilization agent, poloxamer 407, was used to improve the stability of AL nanoemulsion. The effects of UT in 3-D AL membranes were studied by measuring swelling behavior and contact angle. The surface morphology was measured with scanning electron microscopy (SEM). Comparing to 2-D AL membranes, 3-D AL membranes presented rougher surface due to AL nanoparticles presence. When UT was incorporated in AL membranes, strong antioxidant activity and higher contact angle and swelling ratio were observed than non-UT incorporated AL membranes.
Oxidation Behavior of TiC/Mo Composites by Spark Plasma Sintering
Authors: Liu Yao Long , Zhu Yan Qing , Yang Xue Kai , Bao Zi Ming , Han Ren Heng , Zhang He Xin , Zhao Cheng Zhi
Published: August 2020

This paper aims to research the high-temperature oxidation behavior of TiC/Mo composite. Adding 5 wt.% TiC, Mo-based composite was prepared by Spark Plasma Sintering. The composite was oxidized at different temperatures (400°C, 600°C, 800°C, 1000°C and 1200°C) and times (5 min, 10 min, 20 min, 30 min and 60 min). When oxidation was at 400-1000°C for 20 minutes, the degree of oxidation intensifies with the increase of temperature, and TiO2 was observed at 1000°C. While the temperature was 1200°C, the oxidation rate gradually decreased with the increase of time. The result shows that the formation of TiO2 can inhibit the oxidation process.
Reviews on Different Types of Rooftile BIPV: Materials Point of View
Authors: Safitri Nelly , Syahyadi Rizal , Rizal Faisal , Yassir Yassir
Published: August 2020

Building integrated photovoltaic (BIPV) is defined as the integration of photovoltaic (PV) modules into the building envelope (in this case the rooftile) to generate clean and environmental-friendly electricity from the sun radiation. The architectural integration of PV collector modules in new construction makes possible to create glazed surfaces which, besides being an aesthetical and functional innovation, generate electricity, that is allowing the realization of solar control and electric range with consequent energy savings. However, up until now, there have been limited studies that analysed BIPV from its materials point of views. This paper aims to expose rooftop BIPV materials that further might be used to replace conventional rooftiles such as terracotta or slate, concrete, plastic, and clay tiles. The flat rooftiles of monocrystalline-, polycrystalline-, and a-silicone based BIPV cells are being considered in this paper. Their benefits and drawbacks are also put into account. The parameters that were compared are materials, their physical layouts, and the transparency and output power.
Changing from a Vertical Burr to a Horizontal Burr in the Vertical-Type High-Speed Twin-Roll Caster
Authors: Haga Toshio , Murakami Yushi , Kitamura Shou , Watari Hisaki , Nishida Shinichi
Published: August 2020

Strip casting using a side dam plate produces a vertical burr at the strip edge. In the present study, changing this vertical burr into a horizontal burr using a burr changer is proposed. The burr changer was placed inside the side dam plate. The burr changer was made from mild steel and an insulator sheet and cut along the shape of the roll. The burr changer was placed so as to prevent exhaustion of semisolid metal between the side dam plate and the roll-side surface. When the position of the burr changer was appropriate, the vertical burr changed into a horizontal burr. The horizontal burr was flat. The width of the horizontal burr was affected by the lowest position of the burr changer and became narrower as the lowest position of the burr changer approached the roll gap position.
A Case Report of Medical Management Prior to Surgical Intervention in Molar Pregnancy with SVT
Authors: Nishanthi V. , Aravinthan M. , Sivansuthan S.
Published: August 2020

Gestational trophoblastic diseases comprise a spectrum of premalignant and malignant diseases, including hydatidiform mole (complete or partial), placental site trophoblastic tumor, choriocarcinoma and gestational trophoblastic neoplasia. Hydatidiform mole is the most common form of these (1). We report a case of 35-year-old women in her 5th para with the POA of 12 weeks presented with the features of thyrotoxicosis complicated with multiple episodes of SVT found to have molar pregnancy. She underwent medical cardioversion and thyroid suppressive treatment in order to stabilize and prevent perioperative complications. She underwent surgery and complete recovery was noted. Even though the definitive treatment is surgical its essential to consider the medical management first to stabilize the patient prior to the surgery.
Vertebral Osteomyelitis in a Young Immunocompetent Adult: A Case Report
Authors: Nishanthi V. , Sivansuthan S.
Published: August 2020

Vertebral osteomyelitis is a rare entity and primarily found in adult over 50 years with male predominance. We report a case of 19-year immunocompetent girl with the history of fever and lower back pain and spinal tenderness found to have vertebral osteomyelitis and started on antibiotics and rapid improvement was noted. It’s essential to suspect the possibility of vertebral osteomyelitis in young age group who are presenting with the pathognomonic signs and symptoms.
Phoenix Rising from the Ashes: A Story of Successful Management of a Severe Paraquat Poisoning
Authors: Thineskaran P. , Selvaratnam G. , Kumanan T. , Suganthan N.
Published: August 2020

Self-poisoning with pesticides is a major public health problem in many developing countries, accounting for up to one-third of all suicides worldwide according to recent estimates and Sri Lanka is not an exception. Here we reporting a case of paraquat poisoning in a 17-year-old-girl presented after self-ingestion. She developed oropharyngeal ulcers and clinical and laboratory evidence of multi organ damage. She was successfully treated with cyclophosphamide and steroid, initiated very early stage in addition to other supportive measurers. She made an uneventful recovery.
Inducible MicroRNA-217 Inhibits NF-κB– and IRF3-Driven Immune Responses in Lower Vertebrates through Targeting TAK1
Authors: Zhang Lei , Chu Qing , Chang Renjie , Xu Tianjun
Published: August 2020

Upon recognition of bacterial or viral components by pattern recognition receptors, cells could be activated to produce inflammatory cytokines, type I IFN, and IFN-stimulated genes. These antibacterial and antiviral immunities are tightly regulated by the host to prevent inappropriate immune responses. MicroRNAs (miRNAs) have emerged as an essential regulatory network with profound effects on mammalian inflammation and immune responses, but the regulatory networks of miRNA-mediated immune response in lower vertebrates remain largely unknown. In this study, we report a miRNA, miR-217, identified from miiuy croaker, which plays a negative role in host antiviral and antibacterial immunity. We found that miR-217 could be abundantly expressed upon Gram-negative bacteria, as well as rhabdovirus infection. Inducible miR-217 suppresses the production of inflammatory cytokines and type I IFN by targeting TAK1, thereby avoiding excessive inflammation. Particularly, we revealed that miR-217 modulates the antibacterial and antiviral immunity through TAK1-mediated NF-κB and IRF3 signaling pathways. The collective results indicate that miR-217 acts as a negative feedback regulator involved in host antibacterial and antiviral immune responses, which will provide insights into the intricate networks of host–virus interaction in lower vertebrates.
Mixing and average mixing times for general Markov processes
Authors: Anderson Robert M. , Duanmu Haosui , Smith Aaron
Published: August 2020

Yuval Peres and Perla Sousi showed that the mixing times and average mixing times of reversible Markov chains on finite state spaces are equal up to some universal multiplicative constant. We use tools from nonstandard analysis to extend this result to reversible Markov chains on compact state spaces that satisfy the strong Feller property.
A note on homology for Smale spaces
Authors: Proietti Valerio
Published: August 2020

We collect three observations on the homology for Smale spaces defined by Putnam. The definition of such homology groups involves four complexes. It is shown here that a simple convergence theorem for spectral sequences can be used to prove that all complexes yield the same homology. Furthermore, we introduce a simplicial framework by which the various complexes can be understood as suitable "symmetric" Moore complexes associated to the simplicial structure. The last section discusses projective resolutions in the context of dynamical systems. It is shown that the projective cover of a Smale space is realized by the system of shift spaces and factor maps onto it.
Quem é Esse Pokémon? Uma Análise do Jogo de Cartas Pokémon à Luz da Teoria dos Campos Conceituais
Authors: Silva Nadine Rodrigues , Pessoa Cristiane , Carvalho Ana Beatriz Gomes
Published: August 2020

Este artigo traz uma discussão sobre o potencial do universo ficcional de entretenimento Pokémon no âmbito educacional. Tal universo apresenta as características de uma obra transmidiática apresentadas por Jenkins (2009), dentre elas a capacidade de se expandir para diversas plataformas midiáticas, proporcionando múltiplas experiências de interação entre seus fãs. Partindo da premissa de que é possível utilizar alguns jogos, desenhos e quadrinhos em benefício da aprendizagem, nosso objetivo principal é discutir sobre as contribuições de um elemento deste universo, o jogo de cartas colecionáveis, sob a perspectiva da Educação Matemática, à luz da Teoria dos Campos Conceituais, de Gérard Vergnaud. Para este estudo, analisamos cinco baralhos de cartas Pokémon, nos quais algumas cartas apresentam situações-problema envolvendo as estruturas aditivas e multiplicativas. Após esta análise, foi possível reconhecer nos comandos de algumas das cartas do jogo situações-problema aditivas, do tipo transformação e multiplicativas do tipo proporção simples. Embora os problemas explorados nas cartas sejam especificamente de dois tipos, é necessário destacar a importância do jogo para o trabalho matemático. Ao desenvolverem o cálculo relacional e o cálculo numérico durante as partidas, os jogadores são estimulados a desenvolverem o raciocínio matemático.