bluuebunny/crossref_metadata_2025 huggingface dataset:
CHARACTERIZATION OF TRIBOLOGICAL PROPERTIES
OF OXIDE LAYERS OBTAINED ON TITANIUM IN DIFFERENT
FRICTION COUPLES
Authors: ANIOŁEK Krzysztof , BARYLSKI Adrian , KUPKA Marian , KAPTACZ Sławomir , CZAJEREK Paulina
Published: November 2018

The paper presents the characterization of tribological properties of titanium Grade 2 before and after
isothermal oxidation in different friction couples. Examinations of the surface morphology after oxidation at
a temperature of 600°C showed the presence of scratches on the surface, which indicated a low thickness of the
oxide layers obtained. On the surface oxidized at 700°C, the morphology was characterized by the presence
of small clusters of oxides which formed into shapes resembling flakes. In that case, no scratches were found,
which testified to a higher thickness of the oxide layer. Tribological tests were conducted for different friction
couples (Al2O3, ZrO2, and 100Cr6 balls). It was found that isothermal oxidation is an effective method to
improve the resistance of titanium Grade 2 to sliding wear. Oxide layers obtained at temperatures of 600°C
and 700°C allowed achieving a considerable reduction of volumetric wear. The best resistance to sliding
wear was achieved during a tribological interaction of oxidized titanium Grade 2 with bearing steel 100Cr6.
Examination of the morphology of the wear trace surface showed the presence of “corrugation wear” on the
non-oxidized surface, regardless of the counter-specimen used. It was found that the presence of oxide layers
on the surface of titanium Grade 2 effectively eliminated this adverse phenomenon.
A STUDY OF THE IMPACT OF DYNAMIC GROUND ACTIONS ON MOMENTARY VALUES OF FRICTION FORCES AT THE GAS PIPELINE-BACKFILL INTERFACE
Authors: GAWĘDZKI Wacław , LEPIARCZYK Dariusz , TARNOWSKI Jerzy
Published: November 2018

Buried pipelines are subjected to the action of static forces and moments caused by friction forces at the pipeline-ground contact. At the same time, pipelines are subjected to dynamic actions generated by paraseismic pulses, in particular, in areas of mining and heavy traffic. The paper presents and experimentally verifies a test method of tribological pipeline-soil interaction in conditions of artificially induced soil static and dynamic actions. The applied test methodology allows the determination of friction forces at the tested pipeline section. The friction forces changes over time on the pipeline and soil surface for the varying pipeline tensioning forces were continuously recorded during the tests. Based on the Short-Time Fourier Transform (STFT) of signals, the paper presents the impact of dynamic actions on momentary values of measured friction forces. Relationships are given that allow the determination of friction forces between the pipeline and the soil, including their limit values resulting in the loss of the mutual adhesion of the pipeline and the soil.
ADAPTIVE COATINGS a-C/MoS2
Authors: KOT Marcin , LACKNER Jurgen , MAJOR Łukasz , MAJOR Roman , WIĄZANIA Grzegorz , ZIMOWSKI Sławomir
Published: November 2018

One of the latest ideas in surface engineering is the deposition of new kinds of coatings, called adaptive or chameleon. Based on literature review, the different mechanisms of the adaption of such coatings depend on the applied ranges of temperature and loads were compared. Moreover, the main directions of development of adaptive coatings were also presented. The paper includes results of single coatings, a-C and MoS2, as well composite coatings, a-C/MoS2, in which the mechanism of adaptation was expected. Indentation tests were carried out to determine nanohardness and elasticity modulus. The adhesion of coatings to steel substrates was studied by scratch testing, and tribological properties were studied using a high-temperature ball-ondisc tribometer and tests results conducted at room temperature and at elevated temperatures up to 300°C. Results showed that composite coating, a-C/MoS2, can work over the entire range of temperatures with a low coefficient of friction 0.02–0.1 and wear index of 0.07–0.47·10–6 mm3/Nm . Whereas, a-C and MoS2 coatings exhibited a low coefficient of friction and a high wear resistance at low and high temperatures, respectively.
INFLUENCE OF CLIMATIC AGEING ON EROSIVE WEAR KINETICS OF POLYMER NANOCOATINGS
Authors: KOTNAROWSKA Danuta
Published: November 2018

The paper presents the results of erosive resistance investigation carried out on three-layer epoxy-polyurethane coating systems of different polyurethane top coat composition. Alumina nanoparticles with a grain size of 20 nm or silica nanoparticles with a grain size of 12 or 20 nm were applied for the top coat modification. Coating systems with top coats modified using silica nanoparticles with the grain size of 12 nm (nanocoatings) revealed the highest erosive resistance, whereas the lowest one was observed in the case of coating systems with unmodified top coats. Lower erosive wear intensity of nanocoatings follows on their relatively high hardness, as well as low surface roughness. Moreover, nanofillers contained in the top coat reduce the development of defects (pores, cracks) in its structure, increasing the erosive resistance of the coatings. Climatic ageing substantially influenced the formation of polyurethane coatings surface topography. Polyurethane coatings modified with nanofillers showed less change in their surface topography than did unmodified coatings. Therefore, the modification of polyurethane top coats with nanofillers decreases their surface susceptibility to destruction.
CONNECTION BETWEEN STRUCTURAL CHANGES OF IRRIADIATED POLYETHER ETHER KETONE AND MECHANICAL PROPERTIES
Authors: NIEMIEC Aneta
Published: November 2018

The article presents the results of research on the impact of structural changes in polyether ether ketone (PEEK) on its mechanical properties. The polymer was exposed to gamma radiation at a dose of 50 and 150 kGy, and the radiation energy was 4 MeV. Changes in the degree of crystallinity and the related changes in the glass transition and melting temperature for the polymer were determined by differential scanning calorimetry (DSC). Mechanical properties were determined using the micro-mentoring method. The tests showed a change in the degree of crystallinity in the range of several degrees and a significant increase in the glass transition temperature. In terms of mechanical properties, the reduction of hardness and Young’s modulus was observed. Observed changes, especially in terms of changes in the structure of the polymer under the influence of radiation, are difficult to explain, which requires conducting further research, especially in the range of irradiation parameters used. Further research is important because PEEK is used in many fields, especially in conditions conducive to corrosion and the influence of radiation.
RELATION BETWEEN SHEAR STRESS AND SHEARING TIME IN SELECTED LUBRICANT COMPOSITIONS
Authors: CZARNY Ryszard
Published: November 2018

The paper presents the results of studies of the influence of fillers introduced into lubricating greases on changes in values of shear stresses in resulting lubricant compositions. These fillers were powders of graphite, molybdenum disulphide, and PTFE. They are added to grease to improve their tribological properties. They also impact the rheological properties of lubricating compositions, especially on the course of the shear stress, whose value decreases with the duration of the flow of these compositions. Knowledge of changes in the value of this stress is essential in designing central lubrication systems in which these compositions may be used. Tests were performed on lithium grease without fillers as well as on a composition of this grease with the fillers mentioned above. Measurements were carried out using a Rheotest 2.1 rheometer by changing the shearing time at selected gradients of shear rate. Test results have shown that both the kind of filler and the shearing time have an impact on the value of shear stress in the tested lubricant composition.
LUBRICITY OF OIL-REFRIGERANT MI XTURES WITH R600A UNDER STARVED LUBRICATION CONDITIONS
Authors: GÓRNY Kasper , STACHOWIAK Arkadiusz , TYCZEWSKI Przemysław , ZWIERZYCKI Wiesław
Published: November 2018

In refrigeration nowadays, there is a dynamic return to the use of natural refrigerants such as hydrocarbons. These substances do not contain fluorine and chlorine, which contribute to the enlargement of the ozone hole and the greenhouse effect. Hydrocarbons, however, are substances from the A3 safety group (flammable) and are currently mainly used in low-capacity devices. The most commonly used refrigerant in this group is R600a (isobutene). In refrigeration compressors, a situation may occur where the amount of oil in friction nodes is insufficient. In this case, there may be poor lubrication conditions. A situation may also arise in which the lubricant in the friction areas runs out, and the lubrication of the friction nodes will be performed exclusively by the refrigerant. The article presents a concept of a test method allowing an assessment of lubricity properties of oils for refrigeration compressors in the mixture with a refrigerant in the conditions of poor lubrication and in the absence of lubrication with a lubricant. It also contains the results of wear tests that enable an evaluation of the lubricity properties of oil-refrigerant mixtures in the conditions of poor lubrication. The results were obtained for ecological, and recommended for a wider future use, R600a refrigerant with mineral oils. It is also indicated that it is possible to compare various refrigerants in the absence of lubricant and to replicate lubricity properties of oil-refrigerant mixtures in the conditions of poor lubrication and to apply the proposed method for the evaluation of different lubricants in use with a selected refrigerant.
THE EFFECT OT SELECTED FACTORS ON THE PROCESS OF WEAR UNDER OSCILLATORY MOTION
Authors: KACZOR Grzegorz
Published: November 2018

On the surface of the components cooperating under the sliding motion, complex tribological wear processes take place. It leads to the volume loss of components of the friction pair direct metal to metal contact. The amount of this volume depends on the input factors that determine the operation of the friction couple. Therefore, the aim on the presented work was to evaluate the influence of the selected factors on the volume loss on the block and ring under the oscillatory motion. Wear tests were carried out in a non-conformal contact with the use of the T-05 tribotester with the assumed number of operated cycles. As the part of the tests, measurements of the volume loss of the test elements were made. The geometrical structure of the surface of the block and counter block was formed on the basis selected technological process. The relationship between volume and the following factors was obtained: load, frequency of oscillation, and amplitude of oscillation.
THE EFFECT OF HELICAL GROOVE PRESENCE ON THE TRIBOLOGICAL PERFORMANCE OF JOURNAL BEARINGS
Authors: SĘP Jarosław , TOMCZEWSKI Leszek , GAŁDA Lidia
Published: November 2018

The hydrodynamic bearings could suffer critical damages operating in contaminated environments that cause machine breakdown. In such hard operating conditions, hydrodynamic bearings with grooved journals are less sensitive to damage compared to plain bearings. The wear resistance of the grooved journal bearings is several times greater than that of smooth journal bearings. Contaminants existing in the oil film are moved out from the bearing clearance by the groove created on the journal surface. The presence, shape, and geometry of the groove strongly influence the bearings performance. The aim of this article is to study the selected static characteristics of bearings consisting of a journal with the helical groove on its surface. The static characteristics were determined based on the flow simulation in the oil clearance. A three-dimensional, adiabatic model of the oil flow was assumed. The oil flow was described with the Navier-Stokes continuity and energy equations. The equation system was solved by the finite volume method. The numerical model of the flow was verified experimentally on a test stand. It has been established that the grooved journal application leads to a decrease of load capacity in whole range of eccentricity and for all examined clearances. The oil flow rate increase was mainly observed due to spiral groove presence on the shaft.
THE INFLUENCE OF ADDITIVE TECHNOLOGY ON THE QUALITY OF THE SURFACE LAYER AND THE STRENGTH STRUCTURE OF PROSTHETIC CROWNS
Authors: BOJKO Łukasz , RYNIEWICZ Wojciech , RYNIEWICZ Anna M. , KOT Marcin , PAŁKA Paweł
Published: November 2018

Prosthetic crowns reproduce the damaged hard structures of the patient’s own teeth and take over their natural functions, thus securing the correct reconstruction of the stomatognathic system. The aim is to evaluate the crowns for premolars and molars produced by casting, milling, and Selective Laser Melting technologies, in terms of the accuracy of reproducing the degree against the prosthetic pillar, the analysis of the surface layer structure of the step, and the micromechanical parameters of the alloy. The study material included CoCrMo alloy crowns. The conducted study allowed finding that the tightness of prosthetic crowns made using traditional casting technology as well as in SLM milling and technology is comparable and meets clinical requirements. Structural crown analyses confirmed the very good quality of the surface layer obtained with milling technology and SLM technology using the CAD/CAM method. SLM and digital milling allow the formation of precise and durable structures constituting the foundation of crowns in a time much shorter than the casting process.
EFFECT OF RESIDUAL STRESS ON LOAD BEARING CAPACITY OF PVD COATED SURFACES
Authors: CHRONOWSKA-PRZYWARA Kinga , KOT Marcin , SZCZĘCH Marcin
Published: November 2018

The article presents the results of spherical indentation modelling of coating-substrate systems. Modelling was carried out using the finite element method. First of all, the effect of the coating thickness on system deformation and stress distribution was taken into analysis, assuming coating thicknesses of 1, 2, and 5 μm, which are typical for tribological applications as well as models with infinitely thick coating and without a coating. The evolution of maximum radial stresses in the indentation within 0 to 3N load is presented. A significant effect of the coating thickness on the value and location of the maximum stress concentration was observed. The effect of internal stresses on surface bearing capacity with PVD coatings was also analysed. The paper presents the possibility of creating failure maps of coating–substrate systems for the assumed mechanical properties of materials, which allows one to determine the load capacity of coated surface or choose the optimal coating thickness when the maximum strength and contact geometry are known.
INTERACTION OF NOVEL LUBRICANT ADDITIVES BASED ON MoS2 NANOTUBES WITH NON-FERROUS TRIBOLOGICAL MATERIALS
Authors: TOMALA Agnieszka Maria , MICHALCZEWSKI Remigiusz , OSUCH-SŁOMKA Edyta
Published: November 2018

MoS2 nanotubes (NTs) are novel lubricant additives reducing friction and wear of mechanical components made of steel. Nowadays, non-ferrous surfaces are becoming more widely used, mainly as multifunctional coatings working in configuration with a steel pair. As a consequence, the purpose of this work is to reveal the interaction mechanism of nanoparticles with coated elements in lubricated contacts that are essential in future lubrication technologies. The tribological properties were investigated using a reciprocating sliding testing machine in a steel-ball-on-coated-disc configuration. For tribological studies, two commercially available coatings were selected: WC/C and DLC coating. Frictional results show only slight improvement for lubricant blends containing MoS2 nanotubes with selected coatings, and wear tracks are surprisingly very extensive when compare to oils with additives. Generally, the presence of coating in any tribological test configurations diminish the effectiveness of MoS2 NTs when compare to steel/steel contact. Chemical analytics show that interaction mechanisms of the nanotubes and surface changes, depending on the coating material, have the ability to form a chemically derived tribofilm.
THE EFFECT OF MeC NANOPARTICLES ON THE MICROMECHANICAL AND TRIBOLOGICAL PROPERTIES OF CARBON COMPOSITE COATINGS
Authors: ZIMOWSKI Sławomir , KOT Marcin , MOSKALEWICZ Tomasz
Published: November 2018

Nanocomposite carbon coatings composed of a nanocrystalline phase and an amorphous carbon matrix (a-C or a-C:H) are an important group of coatings for tribological applications, especially if low friction is desired. Strong adhesion between the coating and the substrate as well as the ability to carry load are particularly important in ensuring the durability of the system. In this paper, the impact of a reinforcing phase in the form of hard carbides of chromium, titanium and tungsten (MeC) on the micromechanical and tribological properties of MeC/a-C coatings were analysed. The microhardness and modulus of elasticity using the indentation method and adhesion of these coatings to the substrate in scratch tests were determined. On the basis of tribological tests, the friction coefficient and wear rate of the coatings were determined during nonlubricated sliding contact with an alumina ball. The tested nanocomposite coatings showed very good sliding properties and wear resistance. The nc-WC/a-C and nc-TiC/a-C coatings exhibit the smallest coefficient of friction (below 0.1) and the highest wear resistance. The presence of nanocrystalline carbides in the amorphous carbon matrix limits the propagation of cracks in the coatings and allows the higher load carrying capacity.
Polityka wizerunkowa Norwegii – znaczenie dyplomacji pokojowej dla sukcesu Norwegii
Authors: Kobierecka Anna
Published: November 2018

Norway is a small state with little population and pheripheral location. It has surprisingly strong nation brand and it is widely recognised at the same time, which seems to be unusual taking into consideration geographic and demographic determinants together with rather poor soft power resources. The aim of this article is to examin and analyse Norwegian image policy and its evolution. The main Focus is put on the aspects of peace diplomacy as a constant and meaningful element of Norway’s brand and image policy. The tested hypothesis assumes that the pressence of peace usage on various different levels of image policy in Norway is contributing the reputational and image success of this state.
Data Set for the Reporting of Carcinomas of the Nasopharynx and Oropharynx: Explanations and Recommendations of the Guidelines From the International Collaboration on Cancer Reporting
Authors: Lewis James S. , Adelstein David J. , Agaimy Abbas , Carlson Diane L. , Faquin William C. , Helliwell Tim , Hille Jos , Ng Tony , Nicholls John M. , O'Sullivan Brian , Thompson Lester D. R.
Published: November 2018

The International Collaboration on Cancer Reporting was established to internationally unify and standardize the pathologic reporting of cancers based on collected evidence, as well as to allow systematic data collection across institutions and countries to guide cancer care in the future. An expert panel was convened to identify the minimum data set of elements that should be included in cancer reporting from tumors of the nasopharynx and oropharynx. Specifically, there has been a significant change in practice as a result of identifying oncogenic viruses, including human papillomavirus and Epstein-Barr virus, because they preferentially affect the oropharynx and nasopharynx, respectively. For these anatomic sites, when viral association is taken into account, usually reported elements of in situ versus invasive tumor, depth of invasion, and degree of differentiation are no longer applicable. Thus, guidance about human papillomavirus testing in oropharyngeal carcinomas and Epstein-Barr virus testing in nasopharyngeal carcinomas is highlighted. Further, the clinical and the pathologic differences in staging as proposed by the 8th edition of the Union for International Cancer Control are incorporated into the discussion, pointing out several areas of continued study and further elaboration. A summary of the International Collaboration on Cancer Reporting guidelines for oropharyngeal and nasopharyngeal carcinomas is presented, along with discussion of the salient evidence and practical issues.
Data Set for the Reporting of Mucosal Melanomas of the Head and Neck: Explanations and Recommendations of the Guidelines From the International Collaboration on Cancer Reporting
Authors: Williams Michelle D. , Franchi Alessandro , Helliwell Tim , Müller Susan , Thompson Lester D. R.
Published: November 2018

Standardized pathologic reporting for cancers allows for improved communication for patient care and prognostic determination. If used universally, synoptic reporting enhances comparing data globally for scientific leverage. The International Collaboration on Cancer Reporting is a nonprofit organization whose mission is to develop evidence-based, universally available surgical pathology reporting data sets. Multiple different sites within the head and neck may be affected by mucosal melanoma, whose behavior and patient outcome are not equivalent to carcinomas of the corresponding sites. Factors such as Breslow thickness and Clark depth of invasion applied to cutaneous melanomas do not yield any prognostic significance in mucosal sites, and thus are not meaningful. Likewise, margin assessment is unique in head and neck sites. Further, the genetic profile of mucosal melanomas is different from that of most cutaneous tumors. Thus, within the head and neck region, mucosal melanoma is a distinct entity for which a dedicated data set was developed for implementation. The elements that comprise the core (required) and noncore (recommended) elements are discussed.
Data Set for the Reporting of Ear and Temporal Bone Tumors: Explanations and Recommendations of the Guidelines From the International Collaboration on Cancer Reporting
Authors: Gupta Ruta , Sandison Ann , Wenig Bruce M. , Thompson Lester D. R.
Published: November 2018

The International Collaboration on Cancer Reporting (ICCR) was established to internationally unify and standardize the pathologic reporting of cancers based on collected evidence, as well as to allow systematic multi-institutional intercountry data collection to guide cancer care in the future. Such collaborative efforts are particularly essential for developing an evidence base for rare neoplasms or those with marked geographic variation in incidence, such as the tumors of the ear and the temporal bone. The ear and the temporal bone, including the external auditory canal and the middle and inner ear, with the closely associated facial nerve, internal carotid artery, and internal jugular vein, is one of the most complex anatomic structures in the head and neck. A wide range of benign and malignant neoplasms arise in this region. The management of these neoplasms involves complex surgery because of the anatomic confines, and as such, both benign and malignant tumors are included in this data set, as the oncologically equivalent management requires a multidisciplinary approach and standardized nomenclature and terminology. Surgical procedures at this site result in multifaceted 3-dimensional specimens that can be difficult to handle at macroscopic exam. A comprehensive macroscopic examination is important for identifying critical prognostic factors and often requires clinical and radiologic correlation. Histologic examination is straightforward for basal cell or squamous cell carcinoma but can be quite challenging for other neoplasms. A summary of the ICCR guidelines for ear tumors is presented, along with discussion of the salient evidence and practical issues.
Data Set for the Reporting of Malignant Odontogenic Tumors: Explanations and Recommendations of the Guidelines From the International Collaboration on Cancer Reporting
Authors: Slootweg Pieter J. , Odell Edward W. , Baumhoer Daniel , Carlos Roman , Hunter Keith D. , Taylor Adalberto Mosqueda , Richardson Mary S. , Slater Lee , Speight Paul M. , Wright John , Thompson Lester D. R.
Published: November 2018

A data set has been developed for the reporting of excisional biopsies and resection specimens for malignant odontogenic tumors by members of an expert panel working on behalf of the International Collaboration on Cancer Reporting, an international organization established to unify and standardize reporting of cancers. Odontogenic tumors are rare, which limits evidence-based support for designing a scientifically sound data set for reporting them. Thus, the selection of reportable elements within the data set and considering them as either core or noncore is principally based on evidence from malignancies affecting other organ systems, limited case series, expert opinions, and/or anecdotal reports. Nevertheless, this data set serves as the initial step toward standardized reporting on malignant odontogenic tumors that should evolve over time as more evidence becomes available and functions as a prompt for further research to provide such evidence.
Data Set for the Reporting of Carcinomas of the Hypopharynx, Larynx, and Trachea: Explanations and Recommendations of the Guidelines From the International Collaboration on Cancer Reporting
Authors: Helliwell Tim , Chernock Rebecca , Dahlstrom Jane E. , Gale Nina , McHugh Jonathan , Perez-Ordoñez Bayardo , Roland Nick , Zidar Nina , Thompson Lester D. R.
Published: November 2018

The International Collaboration on Cancer Reporting is a nonprofit organization whose mission is to develop evidence-based, universally available surgical pathology reporting data sets. Standardized pathologic reporting for cancers facilitates improved communication for patient care and prognosis and the comparison of data between countries to progressively improve clinical outcomes. Laryngeal cancers are often accompanied by significant morbidity, although surgical advances (such as transoral endoscopic laser microresection and transoral robotic surgery) provide new alternatives. The anatomy of the larynx is complex, with an understanding of the exact anatomic sites and subsites, along with recognizing anatomic landmarks, being crucial to classification and prognostication. This review outlines the data set developed for the histopathology reporting in Carcinomas of the Hypopharynx, Larynx and Trachea and discusses the main elements required and recommended for reporting.
The mediating role of self-concept and coping strategies on the relationship between attachment styles and perceived stress
Authors: Bayrak Rıza , Güler Murat , Şahin Nesrin Hisli
Published: November 2018

The aim of this study was to examine the role of attachment style, self-concept, and coping strategies, in order to explain the differences in perceived stress factors and stress symptoms, in a mediation model. Participants were 515 university students (302 female and 213 male) aged 17-28 years. The assessment instruments were: Social Comparison Scale, Ways of Coping Scale, Experiences in Close Relationships Scale-II, Brief Symptom Inventory and University Students Stress Factors Scale. The results indicated that the effect of anxious attachment on perceived stress factors and stress symptoms was partially mediated by self-concept and coping styles. Our findings revealed that the level of anxious attachment is an important factor to explain perceived stress and stress-related variables.
Differential effects of workaholism and work engagement on the interference between life and work domains
Authors: Di Stefano Giovanni , Gaudiino Maria
Published: November 2018

This study analyzed the differences between workaholism and work engagement in relation to their influence on work–life interference. Workaholism is an addiction to work, characterized by obsessive attitude towards job, whereas work engagement concerns a positive pattern of thoughts and feelings about one’s job; these two constructs thus represent pathological and healthy forms of heavy work investment, respectively. As a consequence, it was expected that workaholism and work engagement would have different effects on perceived interference between work and life domains. We assessed levels of workaholism, work engagement, work-to-life interference, and life-to-work interference in a sample of 212 Italian workers. Results from structural equation modeling showed an inverse symmetry involving patterns and magnitudes of the relations observed: work engagement was more negatively related to life-to-work interference than work-to-life interference, whereas workaholism was more positively related to work-to-life interference than life-to-work interference. Implications about findings of the study are discussed.
Arte Europa – América: Da Modernidade ao Mundo Contemporâneo
Authors: Serpa Leandro
Published: November 2018

Não disponível
A “Outra Noite”
Authors: Gil Ana Lúcia Oliveira Fernandez
Published: November 2018

Este artigo refere-se à construção de novos olhares sobre questões inerentes à obra de arte, a partir do levantamento de problemáticas sobre o processo criativo da artista Sandra de Souza, estabelecendo relações com os textos dos fenomenólogos Levinas e Blanchot. Os autores utilizavam-se de metáforas para explicar a condição do “eu e a obra de arte”, da impossibilidade de estar significando algo que não se explica.Falam da “presença” na “ausência”, fazendo referências a essas “noites”, a essa “obscuridade”, que “ilumina”.
Cultura Visual: Rumo à Compreensão de Outros Universos no Ensino de Artes
Authors: Gralik Thais Paulina
Published: November 2018

Este artigo faz uma reflexão sobre fatores e pensamentos que vêm provocando mudanças e novas tendências no ensino das Artes Visuais. A Arte como expressão, percebida e valorizada apenas como meio para o desenvolvimento pessoal e da criatividade, largamente difundida na modernidade, cede lugar a um fazer artístico consciente e elaborado, associado à compreensão crítica de imagens da Cultura Visual devidamente contextualizadas. Os modelos das culturas únicas da arte erudita estão sendo questionados como objeto de estudos. Por necessidade de associar o ensino de Artes aos problemas da atualidade, estes fundamentos vêm sendo substituídos em função de uma educação intercultural, crítica e democrática. Muda-se a ênfase na cultura de sentido único e singular para a multidirecional, que leva aos estudos críticos sobre a Cultura Visual.
A Salsa como Ferramenta Pedagógica para o Estudo do Ritmo no Contexto da Percepção Musical
Authors: Saraiva Lourdes
Published: November 2018

O objeto desse trabalho é o aprendizado do ritmo utilizando a Salsa como ferramenta pedagógica, no contexto da Percepção Musical. O enfoque em repertórios com diversidades culturais para o ensino do ritmo abre oportunidades de reflexões em vários parâmetros musicais. Assim, o objetivo principal desta pesquisa é apresentar um material didático voltado ao aprendizado do ritmo, com abordagem numa seleção de ritmos afro-caribenhos denominados de Salsa. Esta é caracterizada basicamente pela presença da síncope e da polirritmia - conteúdos de maior complexidade rítmica presentes nos programas da disciplina de Percepção Musical das escolas de música e universidades. A fundamentação teórica para a elaboração desse material baseia-se principalmente nos cinco parâmetros de experiênciação musical de Swanwick: composição, apreciação, execução, literatura e técnica - essenciais para o processo ensino-aprendizagem. A partir dos dados obtidos conclui-se que o estudo do ritmo pode ser realizado de forma mais orgânica, estimulante e contextualizada musicalmente a partir de repertórios com diversidades culturais.
Historicizando o Teatro em Comunidade
Authors: Netto Maria Amélia Gimmer , Nogueira Márcia Pompeo
Published: November 2018

Para o teatro historicizante todos os acontecimentos cotidianos são significativos, particulares e passíveis de indagação. Eles permitem a reflexão sobre o comportamento social e possibilitam que a representação se torne um estímulo ao questionamento da realidade. Segundo Freire, o diálogo verdadeiro é aquele que suscita um pensar crítico, percebendo a realidade como um processo. Esta transformação permanente da realidade implica numa transformação social, pois a história vai se fazendo na medida das ações dos homens e nas relações existentes no presente, não podendo ser vista como cristalização de experiências passadas. Para Brecht, as ações que os homens nos mostram são o que constituem as condições históricas de uma época. As relações humanas devem ser consideradas efêmeras e o teatro deve trabalhá-las sob esta ótica. Nosso campo de experimentação do conceito de historicização enquanto instrumento meto-dológico em teatro e comunidade foi a peça teatral “Vida Loka”, criada por adolescentes de Nova Esperança, que tem como protagonista a personagem Kely, uma típica adolescente da periferia. Através de perguntas estratégicas sobre as opções desta personagem, nos moldes propostos por Brecht, exploramos as relações entre a realidade mostrada nas cenas e o contexto social, político e histórico em que está inserida a comunidade em que vivem os adolescentes.
Bases Curriculares para as Artes Visuais no Ensino Fundamental
Authors: Duarte Maria Lúcia Batezat
Published: November 2018

Este texto teórico é referenciado pela prática docente da autora, de seus alunos e ex-alunos, e de professores do Ensino Fundamental. Os demais pensadores que respaldam a proposta apresentada são fontes primárias, isto é, autores que formularam o seu pensamento refletindo sobre dados coletados em investigação com crianças e adolescentes. As perguntas às quais se busca responder são: O que é possível ensinar? Como ensinar Artes Visuais no Ensino Fundamental? De cunho didático-pedagógico, o texto é subdividido em quatro subitens: Níveis de compreensão e aprendizagem; Conteúdos de Ensino de Artes Visuais; Aspectos do desenvolvimento infantil; e Exemplos sobre o trabalho em sala de aula a partir da proposta apresentada.
Brincadeira e Música: orientações necessárias
Authors: Natera Gislene
Published: November 2018

Este trabalho pressupõe a complexidade do brincar e da música estarem presentes no cotidiano da educação básica. Primeiramente apresentam-se conceitos sobre brincadeira e brinquedos e um breve resumo de algumas pesquisas que se referem ao tema. Em seguida, apresentam-se algumas contribuições de educadores musicais que discutem música e brincadeira e as orientações nacionais. Conclui-se que o tema é rico, complexo e que ainda há muito espaço para debates e reflexões, porém, sente-se necessidade da inclusão de cursos de formação musical e pedagógico-musical para todos os educadores que atuam principalmente na educação infantil e anos iniciais do ensino fundamental.
Uma Experiência com o Samba no Ensino Fundamental
Authors: Demarchi Ericson , Vechi Hortênsia , Amaral Maria Luiza Feres do
Published: November 2018

Este artigo apresenta um trabalho da disciplina de estágio supervisionado do Curso de Licenciatura em Música da Universidade do Vale do Itajaí. Dentro deste, serão encontradas informações e relatos de experiência sobre a prática do samba em algumas de suas formas de manifestações utilizando a interdisciplinaridade a fim de resgatar vivências sociais realizadas em um ambiente não formal de ensino para um ambiente formal. Esta pesquisa foi feita com uma turma, de 37 alunos com faixa etária entre 11 e 12 anos de idade, do ensino fundamental em uma escola particular, localizada no bairro Vila Operária, na cidade de Itajaí. O presente trabalho mostra como foi a experiência de levar alguns estilos e instrumentos relacionados ao samba propondo a prática de percussão corporal, estudo de células rítmicas básicas dos instrumentos, repertório e criação de versos. Além disso, fez-se através da interdisciplinaridade a relação do samba com a organização comunitária social, que foi o tema geral deste estágio.
A formação do professor de música e o estágio
Authors: Bona Melita
Published: November 2018

Neste artigo apresentam-se os resultados da trajetória do Estágio Obrigatório em Música realizado por uma turma de alunos do Curso de Música da Universidade Regional de Blumenau, FURB. Compreende-se o estágio como um processo, no qual os conhecimentos e as competências adquiridas durante o curso sejam transformados em ações pedagógicas. Nesta pesquisa, aponta-se para as atividades de estágio como possibilidade de inserção do aluno à pesquisa científica. Os dados correspondem às quatro fases do estágio desenvolvidas nos semestres letivos de 2008 e 2009, compreendendo a observação e a prática do ensino de Música na Educação Infantil, no Ensino Fundamental e no Ensino Médio. Analisam-se os relatórios obtidos ao final de cada uma das fases, no sentido de verificar se os acadêmicos deram continuidade às questões de pesquisa apresentadas no início do processo. Os resultados indicam que, na maioria dos trabalhos, o foco de pesquisa permaneceu e o caráter investigativo do estágio corroborou para práticas educativas mais elaboradas.
O aprendizado através do contexto: relato de uma experiência vinculada ao PIBID artes visuais
Authors: Antonio Denilson Cristiano
Published: November 2018

O presente artigo apresenta uma pesquisa desenvolvida para meu Trabalho de Conclusão de Curso, criando articulações entre meus interesses em pesquisa como futuro professor e a oportunidade em ser bolsista do Programa Institucional de Bolsa de Iniciação a Do- cência (PIBID) na área de Artes Visuais, no ano de 2013. Atuando e acompanhando as aulas durante um ano letivo, preparei o conte- údo, unindo a experiência dentro da sala de aula e minhas pesquisas referentes ao conteúdo planejado. O trabalho aborda a cultura dos bonecos e das máscaras, onde relato como abordei o tema e as pos- síveis relações que pesquisei, para poder relacionar e contextualizar com a realidade da cultura local. Transpassei as épocas explorando as culturas e a arte em torno das máscaras, para somente depois propor que cada aluno produzisse sua própria máscara. Também apresento minhas reflexões sobre a experiência de acompanhar a turma durante um ano inteiro, bem como os problemas da escola pública, analisando de um ponto de vista em que relaciono com os ensinamentos de Paulo Freire.
Hydrogen Production by Photoreforming of Organic Compounds
Authors: Rossetti Ilenia , Bahadori Elnaz , Villa Alberto , Prati Laura , Ramis Gianguido
Published: November 2018

H2 is gaining attention as energy vector, particularly if produced from renewable sources.It may be produced through photoreforming of organic compounds that act as hole scavengers to improve hydrogen productivity with respect to direct water photosplitting. Methanol is used here as model molecule to investigate the effect of catalyst composition and of substrate concentration on photocatalytic activity. Simple catalysts formulations were selected, in order to propose an easily scalable technology with a poorly expensive material. TiO2 with different structure (anatase, rutile and a mixture of them) was used as semiconductor, doped with a small amount of Au (0.1 wt%) to improve the lifetime of photogenerated charges.A new photoreactor was set up, with external irradiation that improves the scale up feasibility and possible future application with solar energy. Methanol conversion and hydrogen productivity increased with increasing methanol concentration up to 15 wt%. Rutile led to the highest conversion, but TiO2 P25 showed the highest hydrogen productivity.The best result was achieved by treating a 15 wt% methanol solution with 0.1 wt%Au/TiO2 P25, which led to 0.276 mol H2 h-1 kgcat-1.
Habitat suitability and connectivity inform a co-managed policy of protected areas networks for Asian elephants in China
Authors: Huang Cheng , Li Xueyou , Khanal Laxman , Jiang Xuelong
Published: November 2018

Enlarging protected areas (PAs) network is critical to ensure the long-term viability of Asian elephants from habitat fragmentation and loss. While challenges are raised in the strictly government-managed policy of PAs networks due to the difficulties in persuading participation of stakeholders and meeting habitat requirements of the elephants. This study hypothesized that a co-managed policy is more plausible than the strict policy to enlarge PAs network for Asian elephants in a “developing” world. We identified the suitable habitat for Asian elephants using the maximum entropy modeling approach (MaxEnt) and examined the socio-economic context of the habitat. The hypothesis was supported by our results: (1) Asian elephants prefer forest matrix with multiple land use (50% forest cover) rather than interior of large forest and roam in proximity of human habitations (mean distance 1.85 km); (2) suitability and the level of economic development of the habitats are negatively correlated (p = 0.04). Additionally, we provided an empirical study on corridor designing for the study area in China.
First occurrence of the enigmatic peccariesMylohyus elmoreiandProsthennops serusfrom the Appalachians: latest Hemphillian to Early Blancan of Gray Fossil Site, Tennessee
Authors: Doughty Evan M. , Wallace Steven C. , Schubert Blaine W. , Lyon Lauren M.
Published: November 2018

Two peccary species,Mylohyus elmoreiandProsthennops serusare described from the medium-bodied fauna of the Gray Fossil Site (GFS) of northeastern Tennessee. This site, recognized as an oak-hickory forest, is latest Hemphillian or earliest Blancan based on mammalian biochronology, with an estimated age of 4.9–4.5 Ma. The GFS represents the only site outside the Palmetto Fauna of Florida withM. elmorei, greatly expanding the species range north over 920 km, well into the Appalachian region. This is also the first Appalachian occurrence of the relatively widespreadP. serus. Our understanding of intraspecific variation for bothM.elmoreiandP.serusis expanded due to morphological and proportional differences found in cranial and dental material from the GFS, Tyner Farm locality, Palmetto Fauna, and within the literature. The GFSM. elmoreimaterial represents the most complete mandible and second cranium for the species, and preserve intraspecific variation in the length of the diastema, dental proportions, and the complexity of the cuspules of the hypoconulid complex. Similarly, mandibular material from the GFS forP. serusexhibited larger dentitions and a greater degree of robustness than currently recognized for the species.
APRENDIZAGEM A LONGO PRAZO NA FORMAÇÃO INICIAL DE PROFESSORES
Authors: Yamazaki Sérgio Choiti , Yamazaki Regiani Magalhães de Oliveira
Published: November 2018

Apresentamos um estudo de caso efetuado em uma universidade pública brasileira que teve o objetivo de verificar aprendizagem duradoura (JONNAERT, 1996) de alunos de um curso de licenciatura em Física. Segundo Jonnaert, uma aprendizagem duradoura só é possível em períodos pós-escolares. Contudo, uma pesquisa de Franklin, Sayre e Clark (2014) mostrou que alunos que participaram de um curso de forma ativa permaneceram com o conhecimento adquirido por um período escolar mais longo do que aqueles que participaram de um curso similar que se utilizou de uma estratégia de ensino tradicional. Neste contexto, avaliamos aprendizagem adquirida em uma disciplina de Prática de Ensino após um período de 2 anos. Trata-se de um estudo de caso para verificação da permanência ou ausência de um discurso em alunos que tiveram envolvimento ativo no decorrer da disciplina. Os resultados, dispostos em gráficos, apontam para correlação entre participação ativa e aprendizagem duradoura.
MODELAGEM MATEMÁTICA E A TEORIA DOS REGISTROS DE REPRESENTAÇÃO SEMIÓTICA: UMA ANÁLISE A PARTIR DOS ARTIGOS PUBLICADOS NA CONFERÊNCIA NACIONAL SOBRE MODELAGEM NA EDUCAÇÃO MATEMÁTICA
Authors: Mutti Gabriele De Sousa Lins , Matioli Cristiane Elise Reich , Klüber Tiago Emanuel
Published: November 2018

Tomando a relação a Modelagem Matemática e a Teoria dos Registros de Representação Semiótica como região de inquérito, realizamos uma metapesquisa orientada pela interrogação: O que se mostra da relação entre a Modelagem Matemática e a Teoria dos Registros de Representação Semióticas, nos artigos publicados na Conferência Nacional sobre Modelagem na Educação Matemática? A interrogação foi estabelecida a partir de uma abordagem qualitativa de pesquisa, por meio da análise de conteúdo dos artigos publicados na Conferência de 2005 a 2017. Os resultados revelaram que as atividades de Modelagem favorecem não só a mobilização de diferentes registros de representação como transformações entre eles, notadamente, a conversão do registro gráfico para o algébrico, deveras incomum no contexto escolar
METODOLOGIA DE PROJETOS: ESTRATÉGIAS PARA O ENSINO DE MATEMÁTICA DO ENSINO FUNDAMENTAL II
Authors: Maçumoto Martha Caputo Savino Santolia Cancela , Romão Estaner Claro
Published: November 2018

Metodologia de Projetos tem sido uma estratégia de ensino e aprendizagem que vem ganhando espaço na educação ao longo das décadas. Muitos, porém, trabalham com essa metodologia de forma equivocada, contextualizando em um cenário de exercícios dados em sala de aula. O resultado significativo da utilização desta metodologia de ensino acontece quando o aluno vive o problema que deve resolver, ou seja, quando se torna o protagonista da resolução do problema. Este projeto desenvolvido pelo 6º ano do Ensino Fundamental visou resolver problemas de matemática com o fim de arrecadar verba para um Asilo. A pergunta que direcionou a pesquisa foi: “Metodologia de Projetos, como estratégia de ensino, favorece a aprendizagem de matemática de forma efetiva?”. Durante o projeto observou-se que os alunos desenvolveram habilidades de interpretação e resolução de problemas, e ainda notou-se o amadurecimento de atitudes de cidadania e respeito.
СИНТЕЗ КОНДЕНСИРОВАННЫХ 2Я-ПИРИДИН-2-ОНОВ В УСЛОВИЯХ МУЛЬТИКОМПОНЕНТНОЙ РЕАКЦИИ ГАНЧА, "Журнал органической химии"
Authors: Страшилина И.В. , Арзямова Е.М. , Федотова О.В.
Published: November 2018

Изучено one-pot взаимодействие замещенного 4-гидрокси-2Н-пиран-2-она с ароматическими альдегидами и ацетатом аммония в условиях модифицированной реакции Ганча в кислой среде при термической и микроволновой активации. Выделены арилметиленбис-4-гидрокси-2Н-пиридин-2-оны, гидрохроменопиридинон и их кислородсодержащие гетероаналоги. Подтверждена первоначальная конденсация в биспиран-2-оновые аддукты, а при использовании салицилового альдегида - в пиранохромен с последующей рециклизацией пираноновых фрагментов в пиридиноновые.
СИНТЕЗ ПРОИЗВОДНЫХ 5H-ХРОМЕНО[2,3-6]ПИРИДИНА С ИСПОЛЬЗОВАНИЕМ УЛЬТРАЗВУКА, "Журнал органической химии"
Authors: Бардасов И.Н. , Алексеева А.Ю. , Безгин Д.А. , Насакин О.Е. , Ершов О.В.
Published: November 2018

Разработан экологичный метод получения производных 5H-хромено[2,3-b]пиридина в водной среде при облучении ультразвуком.
ТЕРМИЧЕСКИЕ ПЕРЕГРУППИРОВКИ 3Н- И 4Н-ПИРАЗОЛОВ, ПОЛУЧЕННЫХ НА ОСНОВЕ РЕАКЦИЙ 9-ДИАЗОФЛУОРЕНА С МЕТИЛТЕТРОЛАТОМ И МЕТИЛ 3-ФЕНИЛПРОПИОЛАТОМ, "Журнал органической химии"
Authors: Васин В.А. , Попкова Ю.А. , Безрукова Е.В. , Разин В.В. , Сомов Н.В.
Published: November 2018

9-Диазофлуорен присоединяется в Et2O при 20°С к метилтетролату по правилу Ауверса и нерегиоселективно - к метил-3-фенилпропиолату с образованием спироциклических 3Н-пиразолов. Аддукт метилтетролата при кипячении в толуоле превращается в метил-3a-метил-3aH-дибензо[e,g]- индазол-3-карбоксилат, при 190°С в бензоле - в метил 3-метил-2H-дибензо[e,g]индазол-2-карбоксилат, а при 160°С в метаноле - в 3-метил-2H-дибензо[e,g]индазол. Ауверсовский аддукт метил- 3-фенилпропиолата при кипячении в бензоле дает производное циклопропена и изомеризуется в метил-3a-фенил-3aH-дибензо[e,g]индазол-3-карбоксилат при кипячении в метаноле. Антиауверсовский аддукт при кипячении в бензоле изомеризуется в метил 2-фенилпиразоло[1,5-f]фенантридин-3-карбоксилат.