bluuebunny/crossref_metadata_2025 huggingface dataset:
Localized and Itinerant States in Actinide Materials
Authors: Joyce J.J. , Durakiewicz T. , Olson C. G. , Guziewicz E. , Graham K. S. , Moore D. P. , Morales L. A.
Published: June 2019

The electronic structure of single crystal UO2 and polycrystalline δ-Pu is examined using photoelectron spectroscopy. These two actinide materials exhibit properties consistent with the 5f electrons at the threshold between localized and itinerant character. The results for δ-Pu may be viewed as the 5f electrons exhibiting a dual nature with some fraction of the 5f levels localized and not participating in the bonding while the other fraction of 5f character is involved in bonding and hybridization with the conduction electrons. For UO2 where angle-resolved photoemission is available, one observes dispersion in the 5f features indicative of the 5f electrons being influenced by the periodic potential of the lattice rather than purely influenced by the site to which the 5f electrons are generally localized.
Nature of Non-magnetic Strongly-Correlated State in Plutonium
Authors: Purovskii Leniod , Shick Alexander , Havela Ladislav , Katsnelson Mikhail , Lichtenstein Alexander
Published: June 2019

Local density approximation for the electronic structure calculations has been highly successful for non-correlated systems. The LDA scheme quite often failed for strongly correlated materials containing transition metals and rare-earth elements with complicated charge, spin and orbital ordering. Dynamical mean field theory in combination with the first-principle scheme (LDA+DMFT) can be a starting point to go beyond static density functional approximation and include effects of charge, spin and orbital fluctuations. Ab-initio relativistic dynamical mean-field theory is applied to resolve the long-standing controversy between theory and experiment in the “simple” face-centered cubic phase of plutonium called δ-Pu. In agreement with experiment, neither static nor dynamical magnetic moments are predicted. In addition, the quasiparticle density of states reproduces not only the peak close to the Fermi level, which explains the large coefficient of electronic specific heat, but also main 5f features observed in photoelectron spectroscopy.
Comparative Experimental Study of X-Ray Absorption Spectroscopy and Electron Energy Loss Spectroscopy on Passivated U Surfaces
Authors: Nelson Art J. , Moberlychan W. J. , Bliss R. A. , Siekhaus W. J. , Felter T. E. , Denlinger J. D.
Published: June 2019

X-ray absorption spectroscopy and electron energy loss spectroscopy are complementary analytical techniques on energy and spatial resolution. These techniques are based on the same fundamental physical process of core excitation with either an incident photon or incident electron. In the proper experimental configuration the electron and photon inelastic scattering amplitudes are comparable and thus the x-ray and electron absorption edges look identical. We have applied these two complementary analytical techniques to investigate the electronic structure of C ion implanted U. Implantation of C+ ions into U238 has been shown to produce a physically and chemically modified surface layer that passivates the surface preventing further air oxidation and corrosion. Comparison of the resultant spectra reveal that transitions between the initial state and a series of final states yield numerous strong features at the absorption edge that can provide structural information and information on the local chemical environment, including the character of the U 5f state.
Radiation Damage Effects on the Magnetic Properties of Pu(1-x)Amx (x=0.224)
Authors: McCall Scott K. , Fluss M. J. , Chung B. W. , McElfresh M. W. , Haire R. G.
Published: June 2019

Pu(Am) is stable in the fcc δ-phase from a few atomic percent to nearly 80 atomic percent Am, expanding the average interatomic separation as the alloy concentration of Am increases. Both Pu and Am spontaneously decay by α-emission creating self-damage in the lattice in the form of vacancy-interstitial pairs and their aggregates. At sufficiently low temperatures, the damage is frozen in place, but can be removed by thermal annealing at sufficiently high temperatures, effectively resetting the system to an undamaged condition. The magnetic susceptibility and magnetization are observed to increase systematically as a function of accumulated damage in the fcc δ-Pu(1-x)Am(x) (x=0.224). Some results of these observations are reported here.
Physical Property Changes in Plutonium Observed from Accelerated Aging using Pu-238 Enrichment
Authors: Chung Brandon W. , Choi Bill , Saw Cheng , Thompson Stephen , Woods Conrad , Hopkins David , Ebbinghaus Bartley
Published: June 2019

We present changes in volume, immersion density, and tensile property observed from accelerated aged plutonium alloys. Accelerated alloys (or spiked alloys) are plutonium alloys enriched with approximately 7.5 weight percent of the faster-decaying 238Pu to accelerate the aging process by approximately 17 times the rate of unaged weapons-grade plutonium. After sixty equivalent years of aging on spiked alloys, the dilatometry shows the samples at 35°C have swelled in volume by 0.15 to 0.17 % and now exhibit a near linear volume increase due to helium in-growth. The immersion density of spiked alloys shows decrease in density, similar normalized volumetric changes (expansion) for spiked alloys. Tensile tests show increasing yield and engineering ultimate strength as spiked alloys are aged.
Uranium Hydride Formation Study as Observed by Scanning Surface Potential Imaging
Authors: Hawley Marilyn E. , Hill Mary Ann , Wang Yongqiang , Schulze Roland K.
Published: June 2019

Uranium is an extremely important material for commercial and military applications (i.e. nuclear power, nuclear weapons, conventional weapons, and armor systems) and, like a number of other materials, is vulnerable to corrosion by environmental gases that affect their properties, leading to component degradation, shortened lifetimes and materials failure. For uranium this is particularly true in the case of corrosion by hydrogen. A fundamental understanding of the corrosion process at the nucleation stage is of critical importance. The goal of this work is to study the role of common chemical impurities in uranium with initiation sites for the formation of destructive hydride blisters. Samples were implanted with various ions, annealed under vacuum at 200°C, than exposed to one atm of ultra-pure hydrogen. Scanning force microscopy surface potential imaging was used to characterize the structure and corresponding electrical properties of polycrystalline uranium surfaces that resulted from the implantation of different suspect atoms after exposure to hydrogen gas. Surface potential images revealed features related to different oxide structures and hydride spots/blisters as well as other features not obvious in the corresponding topograph. In the surface potential images, blisters appear as bright (higher potential) features in sharp contrast to the uranium oxide background. Often a possible inclusion was observed in the center of a blister. Blister formation did not appear to correlate with implantation of any specific specie, however, distinct differences were seen between implanted and non implanted sides of the same sample.
Effects of Long-Term Service on The Aging Behavior of A Water-Quenched U6Nb Alloy
Authors: Zhou Jikou , Hsiung Luke L.
Published: June 2019

Microhardness testing and transmission electron microscopy are used to study the effects of long-term service on the aging behavior of a water-quenched U-6wt.% Nb alloy when subjected to isothermal aging at 200°XC. The original α''c phase in the WQ-U6Nb alloy is found to become partially ordered over 18 years of aging at ambient temperatures, i.e., natural aging, forming a microstructure that is featured by antiphase domain boundaries (APBs). When subsequently aged at 200 °C, an ordered phase U3Nb is precipitated through a nucleation-and-growth mechanism, suppressing spinodal decomposition that occurs when the water-quenched alloy is artificially aged at the same temperature. The different phase transformation paths lead to different microhardness changes during artificial aging: the naturally aged alloy is more slowly hardened, but to a greater microhardness peak value.
Luminescent Sol-Gel Coatings Based on Nanophosphors
Authors: Pénard Anne-Laure , Gacoin Thierry , Boilot Jean-Pierre
Published: June 2019

Nanoparticles of lanthanide vanadate (YVO4:Ln) and phosphate (LaPO4:Ln) are obtained by simple aqueous syntheses. The nanoparticles obtained are stabilized in colloidal suspensions and deposited in sol-gel films by spin-coating using a silicate as inorganic binder. The influence of the thermal treatment on the brightness and the ability to achieve multilayer coatings are discussed.
From Single Molecules to Nanoscopically Structured Functional Materials
Authors: Tremel Wolfgang , Therese Helen Annal , Tahir Muhammad Nawaz , Zink Nicole , Eberhardt Marc , Theato Patrick , Schröder Hans Christian , Müller Werner E. G.
Published: June 2019

The synthesis of MS2 (M = Mo, W) onion-like nanoparticles by means of a high temperature MOCVD process starting from W(CO)6 and elemental sulfur is reported. The reaction can also be carried out in two steps where the intermediate amorphous WS2 nanoparticles formed through the high temperature reaction of tungsten and sulfur in the initial phase of the reaction are isolated and converted in a separate annealing step to onion-type WS2 nanoparticles. Based on a study of the temperature dependence of the reaction a set of conditions could be derived where onion-like structures were formed in a one-step reaction. Onion-like structures obtained in the single-step process were filled, whereas the particles obtained by the two-step procedure were systematically hollow. A model could be devised to rationalize the different outcome of the reactions. The MOCVD approach therefore allows a selective synthesis of open and filled fullerene-like chalcogenide nanoparticles. Furthermore, we demonstrate the novel surface functionalization of WS2 nanotubes with polymeric ligands by complexation with a combination of Ni2+ via an scorpionate-type nitrilotriacetic acid (NTA) and immobilization of TiO2 nanoparticles onto the surface of nanotubes. Synthesis of such a functional polymeric ligand was achieved via a reactive polymer precursor route.
3-D Photonic Band Structure Engineering in Self-Assembled Macroporous Photonic Crystals
Authors: Bartl Michael H. , Carter Kaycee , Bartl Michael H.
Published: June 2019

By applying directional pressure along the (111) crystal axis of opaline photonic crystals under controlled temperatures, inverse opals with symmetry broken structures are fabricated. This selective deformation results in strongly modified photonic band structures and hence optical properties of the photonic crystals. Experimental data are accompanied by theoretical band structure calculations that confirm the experimental results and are used to predict new structures with optimized band gap properties.
Pulsed Laser Deposited Oxide Green Emitting Thin Film Phosphors : Optimization of Growth Conditions
Authors: Thiyagarajan P. , Kottaismay M. , Ramachandra Rao M S
Published: June 2019

Structural and photoluminescence (PL) properties of Zn2(1-x)MnxSiO4 (1 ≤ x ≤ 5) and diffuse reflectance spectroscopy (DRS) and morphological studies of ZnGa2O4:Mn thin film green emitting phosphors grown using pulsed laser deposition (PLD) technique have been investigated. Zn2(1-x)MnxSiO4 thin films grown on Si substrate at 700°C in 300 mTorr of oxygen partial pressure, upon ex-situ annealing at higher temperatures exhibit superior PL intensity. ZnGa2O4:Mn phosphor thin films grown on quartz substrate at 650oC and in-situ annealed in 300mTorr of oxygen partial pressure show better emission intensity. For both Zn2SiO4:Mn and ZnGa2O4:Mn phosphors, luminescence can be assigned to 4T1 – 6A1 transition of Mn2+ within the 3d orbital giving rise to emission at 525 and 503 nm, respectively.
Synthesizing Phosphors Through Microwave Process
Authors: Fang Chris Y. , Agrawal Dinesh K. , Fu Ming , Coveleskie Joan M. , Chau Chung-nin , Walck James , Roy Rustum
Published: June 2019

Various Lamp phosphors, including [Ca10(PO4)6(Cl,F):Sb:Mn], (Y,Eu)2O3 (YOE), BaMgAl10O17:Eu (BAM), and (La,Ce)PO4:Ce:Tb (LAP), with or without flux, have been synthesized by a microwave processing technique in a multimode microwave furnace operating at 2.45 GHz. The microwave-synthesized phosphors were comprehensively characterized for particle size, specific surface area, brightness, and luminescence. Although most properties of the microwave-synthesized phosphors were comparable to that of the conventional products, the kinetics of the phosphor synthesis was substantially enhanced in the microwave processing. As a result, the soaking time at the final temperature was reduced by up to 90% compared to a conventional process. In addition, the required synthesis temperature was also lowered by 100-200°C in microwave process, compared to the conventional process for these lamp phosphors. Certain improved property was also observed in some microwave synthesized samples. The mechanism and advantages of microwave process for the lamp phosphor synthesis through solid-state reaction are addressed.
Oxidative Degradation of Atomized Iron Controlled By the Nanostructured Environment
Authors: Rawat Naveen , Gudyaka Russel , Mohit Kumar , Santhanam Kalathur S.V.
Published: June 2019

A large number of composited materials of atomized iron and multiwalled carbon nanotubes have been prepared and sintered at 850°C for one hour. The sintered samples were examined for thermal and for electrochemical corrosion of atomized iron. The results suggest that the composited materials are free from oxidative degradation. The absence of oxidation of atomized iron in nanocomposited environment is attributed to the configurational geometry and spintronics type interaction proposed in recent theoretical calculations.
Topochemical Strategies for the Formation of Alkali-metal Halide Arrays within Perovskite Hosts
Authors: Viciu Liliana , Zhang Xiao , Kodenkandath Thomas A. , Golub Valdimir , Josepha Elisha , Wiley John B.
Published: June 2019

Multistep topochemical reactions can be used to construct alkali-metal halide arrays within layered perovskite hosts. Combinations of ion exchange and reductive intercalation (A = Li) or reductive and oxidative intercalation (A = Rb) allow one to prepare the compounds such as (A2Cl)LaNb2O7. These products consist of perovskite blocks separated by double alkali-metal halide layers where the local layer structure is dependent on the size of the alkali cation. Details on the synthesis and structures of these materials are presented, and the general utility of the topochemical strategies used in their preparation is discussed.
Perovskite BaCeO3 as a New Redox Host for Catalytic Pd Nanoparticles
Authors: Li Jun , Seshadri Ram
Published: June 2019

We have examined the ability of a carefully chosen perovskite, BaCeO3, to act as a redox host for noble metals, notably Pd, in the hope of producing an “intelligent” catalyst where palladium is absorbed into the host lattice as ions under oxidative conditions and released as elemental Pd under reducing conditions. Pd-substituted perovskites BaCe1-xPdxO3-δ (0 ≤ x ≤ 0.1) were prepared by solid-state reactions in pure oxygen. The crystal structure was refined in the orthorhombic space group Pnma. Palladium was found to be driven in and out of the perovskite lattice upon repeated redox cycles by detailed XRD study. SEM/EDX revealed the formation of perovskite nanowires and nanorods when reducing Pd-substituted BaCeO3 up to 1000°C.
Enhancing the Success of Undergraduates in Engineering: A Teaching Workshop for Faculty and TAs
Authors: Isaacs J. A.
Published: June 2019

Among undergraduates with math SAT scores above 600, the four most commonly cited concerns leading to switching majors from science, math, engineering and technology (SMET) include: (a) poor teaching by SMET faculty, (b) lack or loss of interest in science, (c) belief that non-SMET majors hold more interest, or offers a better education, and (d) feeling overwhelmed by the pace and load of curriculum demands [1]. Less than 50% of students who begin the study of engineering complete their education in the field. In 1999, approximately 150,000 students entered freshmen engineering programs in the United States; approximately 75,000 will not complete an engineering curriculum. The losses of these students from SMET majors occur at a time of increased demand for greater numbers of skilled graduates in engineering.

In order to retain students in engineering programs and produce a pool of technically skilled graduates that is currently needed, serious efforts are required to improve the quality of instruction in these programs. Teaching is the primary concern, since it is reflected in points (a) through (d) above, and therefore, improvements in teaching skills will have the greatest impact on our students. Since most teaching assistants (TAs) and new faculty have no formal training in instruction and assessment, there is a great need for systematic programs for teaching these instructors to improve their classroom effectiveness.

The National Science Foundation funded an extremely successful faculty enhancement workshop entitled “Teaching Teachers to Teach Engineering”, T4E, (1996–1998), which then evolved to the American Society of Civil Engineers' Excellence in Civil Engineering Education (ExCEEd) Program. This “learn by doing” workshop format ensures that participants will make substantive improvements in their teaching skills by the end of one week; it is touted a “be good” program rather than a “feel good” program. The adaptation of these programs as teaching workshops for new faculty and TAs at Northeastern University is discussed in light of our GE Master Teacher Program – a funded initiative to improve the success of freshman engineering students at NU.
The Trials and Errors of Collaborative Learning: A New Faculty Perspective
Authors: Gleixner Stacy H.
Published: June 2019

There are a number of teaching techniques that have proven very useful in involving the students and increasing their learning. As a new faculty member, I have chosen to improve my teaching by first implementing collaborative learning exercises into my classes. The exercises I have used include in-class group problem solving, informal study groups, and group term projects. In this paper, I will detail the published benefits of collaborative learning that led me to use this in my classes. The introduction of collaborative learning exercises into my lectures has also brought a number of problems and fears including time constraints, the practical issues of forming groups in large classes, and the barrier students have towards working together. From the perspective of a new faculty, I will discuss the problems I have had implementing collaborative work into my classes and tips for avoiding and overcoming the problems I have encountered.
Teaching Engineers Materials Selection via the Internet: The Issue of Diverse Student Backgrounds
Authors: Sun Y.Q. , Economy J.
Published: June 2019

The recent advances in the internet communication technologies have provided convenient access to education for time-restricted and place-bound students. This article discusses the opportunities and implications for materials science and engineering educators to reach out, via online courses, to students engaged in a broad range of engineering disciplines. Based on observations in the design and online delivery of a course on the selection of materials, we shall examine in particular the issue of diverse student backgrounds and interests and discuss the benefits and problems of teaching a diverse student body.
Infusing MSE Topics into Non-MSE Curricula: A Multidisciplinary Effort
Authors: Pai Devdas M. , Sankar Jagannathan , Lee Clinton B.
Published: June 2019

Faculty members at the authors' institution are involved in multidisciplinary materials research through a National Science Foundation funded center. One goal of this center is to empower materials education through the incorporation of research outcomes into the undergraduate and graduate curricula. There are currently no MSE degree programs on this campus; therefore, a variety of means is being employed to infuse MSE information into non-MSE curricula. In addition to classroom lectures and case studies, students receive an extramural exposure to the multidisciplinary aspects of MSE by engaging in team or individual projects that exploit fully the center's facilities and resources. Benefits are being experienced in terms of a heightened enrollment of students in graduate MSE programs, and increased placement of students in materials related positions in industry. The paper describes the status of these efforts.
Materials Science And Engineering Education In Estonia
Authors: Mellikov Enn , Kulu Priit , Öpik Andres
Published: June 2019

The background of Estonian higher education in materials science and engineering is given and results of the reform of the higher education system in the Republic of Estonia are described. The formation of Centers of Strategic Competence in Materials Science is highlighted as one of the main results of this reform. The activities and results in the field of the development of an internationally recognized science-based curriculum for under- and postgraduate studies are described.
Learning Materials Science Via the Web Using Nanospheres and Scanning Probe Microscopes
Authors: Ong Eddie W. , Mossman Kenneth , Ramakrishna B.L. , Pizziconi Vincent B. , Glaunsinger William S. , Patrick Eric , Vishwanath Prashanth , Allagadda Kranti , Tan Terence , Razdan Anshuman
Published: June 2019

The Interactive Nano-Visualization for Science and Engineering Education (IN-VSEE) project at Arizona State University (ASU) has developed a remotely operable scanning probe microscope (SPM), a visualization gallery of images, and a number of educational modules with materials themes. It exploits the incredible potential of materials science for teaching at the high school and college level about fundamental concepts that cross traditionally separated disciplines. The packing of spheres is a topic that is ideal for linking together the different science and engineering disciplines because of the ubiquity and relevance of spheres in the materials world and the universality of the rules that govern their packing over a large range of sizes. Students can perform a number of discovery-based learning activities, over the web by simultaneously using IN-VSEE's web-accessible module (e.g., The Music of Spheres) and by accessing the remotely-operable SPM for experimenting with nanosphere samples that they prepare. With these resources students can pose materials questions and are empowered to design their experiments to increase their understanding of real materials. The fundamental concepts (e.g., packing geometry, density, surface composition, long-range/short-range ordering, intermolecular forces, etc.) they learn through these materials science experiments are applicable to many other curricular, research, and technology areas.
Laboratory Activities Used in a Sophomore Materials Science Course at Texas A&M University
Authors: Griffin R. B. , Epps A.L. , Hartwig K. T.
Published: June 2019

A sophomore materials science course has been developed at Texas A&M University as part of a larger five course sequence through the support of the National Science Foundation. Texas A&M University is a member of the NSF sponsored Foundation Coalition. The courses were developed to include active and collaborative learning, application of technology, and integration as important components. Currently, a majority of departments within the College of Engineering (COE) at Texas A&M University have adopted the five-course sequence. During fall 99, the COE is teaching the materials course to 260 students or four sections of 70 students each.

As part of the development of the materials class, a series of experiments have been developed for use within the classroom. The experiments give the students an opportunity to experience hands-on activities. Several of the activities are done within the classroom, while others are performed in a separate laboratory building. The classes consist of two- 1 h 50 min. periods, and this time provides the opportunity to have the laboratory activities in class. The experiments encourage the development of teams and support various applications of materials science. The majority of students have very limited laboratory experience, and this course provides them an opportunity to develop some laboratory skills. Currently, we do seven experiments: 4-point bending, tensile test: metals and polymers, heat treatment, thermal conductivity, viscosity demonstration, and electrical components. In the paper and during the presentation, we will demonstrate several of the experiments and provide examples of student work. A detailed description of each experiment will be included in the paper.
Semiconducting Polymers for Multidisciplinary Education
Authors: Braun David , Kingsbury Kevin , Vanasupa Linda
Published: June 2019

Cal Poly is in the process of revolutionizing how science and engineering students learn about semiconducting materials. Semiconducting polymers currently attract widespread attention as the subjects of numerous research and development projects. Semiconducting polymers are also excellent materials with which to teach structure-property relationships, polymer synthesis, polymer film preparation, optical and electronic properties, semiconductor device fabrication principles, and device testing.

One key benefit of these materials is that they encourage student participation in educational activities that bridge several disciplines. Semiconducting polymers improve student learning by making normally obscure semiconductor concepts more tangible for students in several disciplines: chemistry students create electronics applications for the compounds they synthesize, materials engineering students learn about opto-electronics techniques, and electrical engineering students gain hands-on experience with core concepts in semiconductor devices.

This presentation describes the interdisciplinary projects that students and faculty have participated in thus far, particularly during the phase of lab design and construction.
Prevalence of multiple sclerosis in Goiânia, Goiás, Brazil
Authors: Ribeiro Taysa Alexandrino Gonsalves Jubé , Duarte Aline Leite , Silva Delson José da , Borges Fernando Elias , Costa Vanessa Maia da , Papais-Alvarenga Regina Maria , Diniz Denise Sisterolli
Published: June 2019

ABSTRACT Multiple sclerosis (MS) prevalence, in some cities in Brazil, was estimated and was found to range from 0.75 to 30.7/100,000. The reasons for such a large variation in rates of prevalence are not clear, but environment and genetics help to explain this phenomenon. Methods: A cross-sectional study using three sources of case ascertainment to estimate the prevalence of MS in the city of Goiânia in December, 2015. Results: A total of 318 MS patients was found after removing overlapping sources. The prevalence of MS was 22.4/100,000 population. Conclusion: Our study was the first in Goiás and the third in the midwest region, and we found a great increase in the prevalence of MS in the region. It is necessary to perform other studies using the same methodology for a more accurate evaluation of the true prevalence of MS in Brazil.
As Remodelagens Institucionais nas Estruturas de Apoio à Promoção Comercial no Brasil
Authors: Figueira Ariane
Published: June 2019

RESUMO O objetivo do artigo é compreender como a administração pública brasileira vem respondendo, sob o ponto de vista dos arranjos institucionais e decisórios, às demandas crescentes na área de promoção comercial. O método utilizado foi o estudo de caso, que propicia uma visão aprofundada e longitudinal do processo. As fontes da pesquisa foram de natureza primária e secundária, sendo os dados tratados a partir das técnicas da triangulação e da análise de conteúdo. Os resultados encontrados revelaram que o histórico do processo organizacional e decisório de promoção comercial brasileira foi marcado por três fases: a primeira, referente à constituição e consolidação da área, verificadas dentro da estrutura organizacional do Itamaraty; a segunda, caracterizada pela perda de espaço na centralidade da formulação e decisão dessa política, resultando em uma fragmentação e dispersão de responsabilidades; e a terceira, pela crescente constituição de espaços formais de diálogo interburocrático e com o setor empresarial.
Passiflora foetida yielding and nutritional composition
Authors: Silva Filho Danilo Fernandes da , Batista Manoel Ronaldo Aguiar , Aguiar Jaime Paiva Lopes , Machado Francisco Manoares , Figueiredo José Nilton Rodrigues , Ticona-Benavente César Augusto
Published: June 2019

Abstract Even though wild maracuja (Passiflora foetida) is cultivated in tropical areas, no thorough investigation regarding its yield or nutritional composition is easily available. This paper aims to estimate its fruit yield, using four staking systems; as well as determine both its fruit pulp and peel chemical composition. The treatments used were T1= No staking, T2= A vertical rod, T3= A horizontal rod, 60 cm from the ground, T4= Two horizontal poles, 60 and 120 cm from the ground, and T5= Using horizontal trellises, 80 cm above ground. The findings showed T5, T4, T3, T2 and T1 to yield 1.40, 1.05, 0.66, 0.40 and 0.35 tons of fruits per hectare, respectively. In general, the fruit pulp held higher nutrient content than that of fruit peel. The pulp presented 2.6%, 4.5% and 24.3% protein, lipids and carbohydrates, respectively. We conclude this genotype to bear low yielding potential, which may be lightly enhanced when cultivated using horizontal trellises.
Monitoring the phenology of Myrcianthes pungens (O. Berg) d. Legrand in the state of Rio Grande do Sul - Brazil
Authors: Veit Pedro Augusto , Schwarz Sergio Francisco , Guerra Divanilde
Published: June 2019

Abstract Guabiju (Mycianthes pungens (O. Berg) Legrand) is a fruit tree with great potential for commercial exploitation due to its nutritional characteristics. The aim of this work was to study the reproductive cycle of M. pungensin different regions of Rio Grande do Sul. Phenology was monitored from September 2014 to February 2015 in the municipalities of Três Passos (Northwestern region), Parai and Guabiju (Northeastern region), and Porto Alegre (Metropolitan region). As results, variations in reproductive cycle and thermal sum among accessions were observed, and in Três Passos, the reproductive cycle had duration of 95 days and reached thermal sum of 1290°C. In the municipality of Guabiju, the reproductive cycle lasted 147 days and the thermal sum was 1603°C. In the municipality of Porto Alegre, the reproductive cycle had duration of 133 days and the thermal sum reached 1564°C.
Análise dos determinantes salariais dos profissionais brasileiros produtores de conteúdo musical: uma visão pela abordagem da cauda longa
Authors: Santos Vinícius Barbosa Teixeira Machado dos , Monsueto Sandro Eduardo , Carrijo Bárbara Christina Pereira da Silva
Published: June 2019

Resumo O objetivo deste artigo é a comparação dos determinantes dos salários dos produtores brasileiros de conteúdo musical, divididos entre aqueles que observam maiores e menores rendimentos de seu trabalho. A visão que dá suporte a esta análise é a abordagem da cauda longa, desenvolvida por Anderson (2006), que afirma existir dois mercados distintos para os produtos da indústria musical, ou seja, o mercado de grandes sucessos, os hits, e o mercado de nichos. Para captar os efeitos de cada variável sobre o salário-hora nesses diferentes mercados, são utilizadas regressões quantílicas, aplicadas a uma função de salários tipicamente minceriana. Os resultados mostram que alguns dos vários determinantes dos rendimentos dos trabalhadores possuem efeitos distintos sobre os dois grupos de profissionais.
Especialização e diversificação produtiva: um modelo de painel espacial para a indústria extrativa mineral em Minas Gerais, 2000-2010
Authors: Nahas Mariana Medeiros , Simões Rodrigo Ferreira , Golgher André Braz , Ribeiro Luiz Carlos de Santana
Published: June 2019

RESUMO A indústria extrativa é importante para Minas Gerais. Nos anos 2000, ela dobrou sua participação no valor adicionado estadual, contribuindo com 6,9% do Produto Interno Bruto (PIB) e 20% do PIB industrial, em 2010. No entanto, seus efeitos locais sobre o desenvolvimento regional são ambíguos e pouco estudados. Este artigo busca analisar os efeitos líquidos da mineração sobre a complexificação da estrutura produtiva municipal dos maiores mineradores do estado. Foi utilizado um conjunto de indicadores de economia regional e urbana, bem como a modelagem de painel espacial. As evidências empíricas indicam que, durante a década de 2000, houve perda relativa dos diferenciais regionais de especialização e concentração produtiva nos setores Indústria de Alta e Média Intensidade Tecnológica, Serviços Produtivos Tradicionais e Serviços Produtivos Modernos.
O "efeito nefasto" da corrupção no Brasil: "quem paga mais?" Aplicações com o uso de regressões quantílicas com variáveis instrumentais
Authors: Rocha Leonardo Andrade , Khan Ahmad Saeed , Lima Patrícia Verônica Pinheiro Sales , Poz Maria Ester Soares Dal , Oliveira Fernando Porfírio Soares de
Published: June 2019

Resumo O presente estudo analisa o impacto da corrupção na dinâmica dos investimentos de empresas brasileiras. Para isso, foi adotada uma amostra de 3.444 empresas conforme os microdados disponíveis pelo Enterprise Surveys do Banco Mundial. Usando o estimador de regressão quantílica com variáveis instrumentais os resultados do modelo apontam que, na ausência do controle devido aos problemas de endogeneidade, o estimador tradicional de Koenker e Basset tende a subestimar o impacto da corrupção na redução dos coeficientes de elasticidade dos investimentos das empresas. Firmas situadas nos quantis superiores da distribuição condicional das vendas apresentam melhores resultados na aplicação dos investimentos, mesmo após o efeito perceptivo da corrupção, ao contrário das empresas situadas nos quantis inferiores. Isso sugere que as firmas com elevada performance são menos "impactadas" com a presença da corrupção em relação às firmas com baixa performance.
Análise da formulação da política de garantia de preços mínimos no Brasil pela ótica da economia política
Authors: Schwantes Fernanda , Bacha Carlos José Caetano
Published: June 2019

Resumo O objetivo deste artigo é analisar a evolução da política de garantia de preços mínimos para produtos agropecuários (PGPM) no Brasil no período de 1987 a 2014 (o qual foi marcado por grandes mudanças tanto na formulação quanto no financiamento da política em apreço) sob a ótica de algumas categorias analíticas fornecidas pela economia política. Entre essas categorias se destacam a atuação de grupos de interesses, os macrossistemas (incluindo as arenas de decisão), os subsistemas e as redes de políticas, as quais ajudam a entender as três maiores mudanças ocorridas na PGPM nos últimos 20 anos, as quais são: (1) a separação entre programas de apoio exclusivo à agricultura familiar de outros que também atendem à agricultura não familiar; (2) o caráter menos subvencionista dos novos instrumentos de PGPM que atendem à agricultura não familiar; e (3) o caráter doador dos programas que atendem à agricultura familiar.
SUPLEMENTAÇÃO DE SELÊNIO NA DIETA E QUALIDADE ESPERMÁTICA DO SÊMEN DE TOUROS BRANGUS
Authors: Tsuneda Pedro Paulo , Tsuneda Bruno Hiroshi , Hatamoto-Zervoudakis Luciana Keiko , Zervoudakis Joanis Tilemahos , Marinho Walter Augusto dos Santos , Duarte Júnior Moacir Ferreira , Araújo Eleonora Barbosa , Motheo Tathiana Ferguson , Silva Luis Eduardo Senra e
Published: June 2019

Resumo Objetivou-se avaliar a qualidade espermática do sêmen de touros suplementados com selênio (Se) na dieta. Foram utilizados 16 touros Brangus, igualmente distribuídos em grupo controle (GC) e grupo Se (GSe − 0,1mg de Se/kg de MS de dieta). O experimento teve duração de 75 dias, e os animais foram suplementados por 60 dias. Foram realizadas quatro coletas de sêmen durante o período (0, 30, 60 e 75 dias) por animal. As amostras foram avaliadas quanto a motilidade e vigor espermáticos, integridade e funcionalidade da membrana plasmática (teste de expansão hiposmótico - HIPO) e viabilidade espermática e reação acrossomal (coloração tripla - TRI). Após avaliação, estas foram diluídas em meio Tris-gema com 5% de glicerol, envasadas (40x106 espermatozoides/palheta), resfriadas, congeladas e armazenadas em nitrogênio líquido até a análise. Após descongelação, foram submetidas às mesmas avaliações descritas para o sêmen fresco. Não houve interferência da suplementação com Se nas variáveis vigor espermático, HIPO e TRI do sêmen fresco e descongelado. Porém, constatou-se queda na motilidade espermática do GSe comparativamente ao GC no sêmen fresco (P=0,0035) e descongelado (P=0,0067) após 60 dias de suplementação. Portanto, a suplementação de Se na dieta não foi efetiva na promoção de melhorias dos parâmetros espermáticos de touros Brangus.
Effects of the implementation of a hand hygiene education program among ICU professionals: an interrupted time-series analysis
Authors: Romero Diana Marcela Prieto , Reboredo Maycon Moura , Gomes Edimar Pedrosa , Coelho Cristina Martins , Paula Maria Aparecida Stroppa de , Souza Luciene Carnevale de , Colugnati Fernando Antonio Basile , Pinheiro Bruno Valle
Published: June 2019

ABSTRACT Objective: To evaluate the effects that a hand hygiene education program has on the compliance of health professionals in an ICU. Methods: This was a quasi-experimental study with an interrupted time-series design, conducted over a 12-month period: the 5 months preceding the implementation of a hand hygiene education program (baseline period); the 2 months of the intensive (intervention) phase of the program; and the first 5 months thereafter (post-intervention phase). Hand hygiene compliance was monitored by one of the researchers, unbeknownst to the ICU team. The primary outcome measure was the variation in the rate of hand hygiene compliance. We also evaluated the duration of mechanical ventilation (MV), as well as the incidence of ventilator-associated pneumonia (VAP) at 28 days and 60 days, together with mortality at 28 days and 60 days. Results: On the basis of 959 observations, we found a significant increase in hand hygiene compliance rates-from 31.5% at baseline to 65.8% during the intervention phase and 83.8% during the post-intervention phase, corresponding to prevalence ratios of 2.09 and 2.66, respectively, in comparison with the baseline rate (p < 0.001). Despite that improvement, there were no significant changes in duration of MV, VAP incidence (at 28 or 60 days), or mortality (at 28 or 60 days). Conclusions: Our findings indicate that a hand hygiene education program can increase hand hygiene compliance among ICU professionals, although it appears to have no impact on VAP incidence, duration of MV, or mortality.
SIMBOLISMO SOCIAL ASOCIADO Y ACTITUD MANIPULATIVA EN NIÑOS AMAZÓNICOS PERUANOS
Authors: Tueros Luis Fidel Abregú , Mendes Jussara María Rosa , Arroyo Lourdes Abregú
Published: June 2019

Resumen El Simbolismo Social Asociado (SSA) y la Actitud Manipulativa (AM) están presentes en la mayoría de niños de nueve años de edad de la Amazonía peruana con desarrollo intelectual adecuado (71.2%). El estudio se realizó en 52 niños y sus padres mediante entrevistas en pequeños grupos, aplicándose la prueba TMP y dos guías de entrevista (niños-padres). Los resultados señalan correspondencia significativa entre la preferencia (niños) y la decisión de compra del producto simbolizado (padres), y el 78,5% elegían la misma marca que sus pares. Las dificultades de comprensión del contenido material de la publicidad (CMP) involucran al 78,9% (mayor en área urbana). Existe interdependencia significativa entre AM (niños) y reacciones de compra (padres) y alta discordancia entre respuestas (niños-padres). Educar en la comprensión del CMP a partir de nueve años, podría disminuir las consecuencias del SSA mediante programas psicosociales para la salud mental escolar.
BAKHTIN, CIÊNCIAS HUMANAS E PSICOLOGIA: DIÁLOGOS SOBRE EPISTEMOLOGIA E PESQUISA
Authors: Machado Jardel Pelissari , Zanella Andrea Vieira
Published: June 2019

Resumo Este ensaio teórico, com foco em questões epistemológicas e ontológicas, compõe uma teia de diálogos entre as vozes dos pensadores do Círculo de Bakhtin e as vozes da Modernidade para apresentar, a partir da Filosofia do Círculo, elementos que auxiliem a pensar uma forma outra de pesquisa em Ciências Humanas e, mais especificamente, em Psicologia. Com base nessa incursão discute-se três principais aspectos e seus efeitos à produção de saberes: o lugar do/a pesquisador/a e seu/sua outro/a; o trabalho de escrita de pesquisa e o ideal de verdade do saber.
PROIBICIONISMO E ATENÇÃO EM SAÚDE A USUÁRIOS DE DROGAS: TENSÕES E DESAFIOS ÀS POLÍTICAS PÚBLICAS
Authors: Lopes Fábio José Orsini
Published: June 2019

Resumo O presente trabalho tem como intuito promover discussão acerca da temática de uso e abuso de álcool e outras drogas na sociedade atual. Objetiva refletir sobre os modelos e práticas de atenção a usuários de drogas em meio às políticas públicas atualmente em voga. Parte do reconhecimento sobre a presença do uso de substâncias psicoativas em diferentes contextos e momentos históricos, para, então, discorrer sobre o uso e abuso de drogas. Destaca, ainda, o modelo de atenção psicossocial para usuários de drogas em sua relação com a cultura proibicionista e ações de repressão e intolerância às drogas. Por fim, o artigo conclui que as atuais políticas públicas de atenção aos usuários, incluída a lógica da redução de danos, se encontram em rota de colisão e tensionamento com o ainda predominante proibicionismo e com a velada e desassistida cultura de consumo de drogas.
AS ONTOLOGIAS DO COMUM E A PSICOLOGIA SOCIAL: FRAGMENTOS DE UMA APOSTA
Authors: Motta Clara Urzedo Rocha , Mizoguchi Danichi Hausen
Published: June 2019

Resumo No presente artigo, pretende-se apresentar as bases ontológicas que possibilitam a emergência de um modo específico de performatizar a Psicologia Social a partir daquilo que denominaremos de ontologias do comum.Ao versarmos sobre a ontologia, o fazemos considerando-a um modo de montar o mundo, sempre revestido de uma dimensão ética, estética e política.É a partir dessa indissociabilidade entre ontologia e ética que nos afastamos da tradição filosófica da representação e nos aproximamos principalmente da perspectiva de Baruch de Espinosa e Friedrich Nietzsche - notadamente junto ao modo como os filósofos franceses Gilles Deleuze e Michel Foucault singularizam as respectivas apropriações destes pensadores.Sob este trabalho de revisão bibliográfica é que, a partir de um mosaico conceitual, gostaríamos de entender alguns conceitos-ferramenta como fundamentais para pensarmos a teoria e a prática de uma Psicologia Social específica na qual apostamos.
DIGRESSÕES ACERCA DA NOÇÃO DE ESTILO: CONTRIBUIÇÕES PARA UMA PERSPECTIVA NÃO MODERNA DO EU
Authors: Arendt Ronald , Quadros Laura Cristina de Toledo , Moraes Márcia Oliveira
Published: June 2019

Resumo O presente artigo pretende discutir a noção de estilo como possibilidade de rever a noção de sujeito numa perspectiva não moderna. A inspiração que nos dá suporte advém da Teoria Ator-rede (TAR), proposta por Bruno Latour e outros autores. O ponto de partida da TAR são as conexões, os laços que articulam humanos a não humanos, tecendo e compondo o mundo em que vivemos. A questão central diz respeito a pensarmos o eu como uma construção relacional e, nesse sentido, recorremos a noção de estilo para desenvolver essa reflexão. Três filósofos contemporâneos - Alfred North Whitehead, Etienne Souriau e Gilles Deleuze - são referências necessárias na compreensão da TAR e nos auxiliam na discussão do conceito de estilo. Discorremos sobre como cada um desses autores aborda esse tema e concluímos indicando os desdobramentos de tais contribuições para pensarmos o eu para além de uma interioridade.
Sintomas depressivos em cuidadores familiares de pacientes com insuficiência cardíaca: revisão integrativa
Authors: Lacerda Marianna Sobral , Prado Patrícia Rezende do , Barros Alba Lúcia Bottura Leite de , Lopes Juliana de Lima
Published: June 2019

Resumo OBJETIVOS Identificar a ocorrência de depressão em cuidadores familiares de pacientes com insuficiência cardíaca e a correlação de outras variáveis com a depressão. MÉTODO A busca bibliográfica foi realizada nas bases de dados Web of Science, Medline, LILACS e PubMed, em março de 2017. Artigos publicados entre 2004 e 2016, escritos em inglês, espanhol ou português, utilizando os descritores saúde, insuficiência cardíaca, depressão, cuidadores e familiares foram incluídos. RESULTADOS Foram selecionados 26 trabalhos. 6% a 64% reportaram sintomas depressivos. Os sintomas depressivos foram associados com as características dos pacientes e cuidadores. Em sua maioria, os sintomas depressivos foram maiores entre os cuidadores familiares que a população em geral e se relacionou principalmente com a sobrecarga do cuidado e a qualidade de vida. CONCLUSÃO Os estudos identificaram sintomas depressivos nos cuidadores de pacientes com insuficiência cardíaca.
Motivos da ação do redutor de danos junto ao usuário de drogas: um estudo fenomenológico
Authors: Tisott Zaira Letícia , Terra Marlene Gomes , Hildebrandt Leila Mariza , Soccol Keity Laís Siepmann , Souto Valquíria Toledo
Published: June 2019

Resumo OBJETIVO Apreender os motivos da ação do redutor de danos ao desempenhar suas atividades junto ao usuário de drogas. MÉTODO Pesquisa qualitativa, realizada em um município do estado do Rio Grande do Sul (RS), Brasil, em maio de 2017, por meio da entrevista fenomenológica com 17 Redutores de Danos. Utilizamos a análise e interpretação da Fenomenologia Social de Alfred Schütz. RESULTADOSDa análise, constatamos três categorias: expectativa por mudanças no mundo da vida do usuário, motivação no trabalho mediado pelo reconhecimento de suas ações, e, relação com o outro como aprendizado para a vida. CONCLUSÃO O motivo da ação do redutor de danos está relacionado à família, busca por uma casa, emprego, acesso à saúde, direitos e estigma, bem como, através do retorno de suas ações, satisfação pessoal e aprendizado junto aos usuários de drogas.
Adaptação transcultural do Competency Evaluation Questionnaire - versão brasileira
Authors: Henriques Silvia Helena , Chaves Lucieli Dias Pedreschi , Brito Lana Jocasta de Souza , Mello Amanda de Lemos , Silva Beatriz Regina da , Leal Laura Andrian
Published: June 2019

Resumo OBJETIVO Descrever o processo de tradução e adaptação para cultura brasileira do Competency Evaluation Questionnaire para enfermeiros hospitalares. MÉTODOS Estudo metodológico de tradução e adaptação transcultural, compreendendo as etapas tradução do instrumento original para o português do Brasil, avaliação consensual das versões traduzidas, retrotradução, validação por juízes e piloto com 29 enfermeiros hospitalares do interior paulista, ocorrido em 2016. RESULTADOS Apresentaram as etapas do processo de adaptação transcultural do instrumento, com ajustes propostos por um Comitê de juízes, composto por 27 itens distribuídos em cinco domínios de competências para enfermeiros hospitalares. O instrumento adaptado para o português apresentou equivalência semântica, idiomática, experimental e conceitual com o original, e o valor total do Alpha de Cronbach 0,932, além da validação parente. CONCLUSÕES O Competency Evaluation Questionnaire demonstrou ser um instrumento confiável, possível de ser utilizado, mas não exclui a necessidade de futuros testes estatísticos visando à validade psicométrica.