Rockets: Physical science teacher's guide with activities

This guide begins with background information sections on the history of rocketry, scientific principles, and practical rocketry. The sections on scientific principles and practical rocketry are based on Isaac Newton's three laws of motion. These laws explain why rockets work and how to make them more efficient. The background sections are followed with a series of physical science activities that demonstrate the basic science of rocketry. Each activity is designed to be simple and take advantage of inexpensive materials. Construction diagrams, materials and tools lists, and instructions are included. A brief discussion elaborates on the concepts covered in the activities and is followed with teaching notes and discussion questions. The guide concludes with a glossary of terms, suggested reading list, NASA educational resources, and an evaluation questionnaire with a mailer

Microgravity: Teacher's guide with activities for physical science

This guide is an educational tool for teachers of grades 5 through 12. It is an introduction to microgravity and its application to spaceborne laboratory experiments. Specific payloads and missions are mentioned with limited detail, including Spacelab, the International Microgravity Laboratory, and the United States Microgravity Laboratory. Activities for students demonstrate chemistry, mathematics, and physics applications of microgravity. Activity objectives include: modeling how satellites orbit Earth; demonstrating that free fall eliminates the local effects of gravity; measuring the acceleration environments created by different motions; using a plasma sheet to observe acceleration forces that are experienced on board a space vehicle; demonstrating how mass can be measured in microgravity; feeling how inertia affects acceleration; observing the gravity-driven fluid flow that is caused by differences in solution density; studying surface tension and the fluid flows caused by differences in surface tension; illustrating the effects of gravity on the burning rate of candles; observing candle flame properties in free fall; measuring the contact angle of a fluid; illustrating the effects of gravity and surface tension on fiber pulling; observing crystal growth phenomena in a 1-g environment; investigating temperature effects on crystal growth; and observing crystal nucleation and growth rate during directional solidification. Each activity includes a background section, procedure, and follow-up questions

the dilemma in Pd-catalyzed polyketone synthesis

A series of Pd-complexes containing nonsymmetrical bis(aryl-imino)acenaphthene (Ar-BIAN) ligands, characterized by substituents on the meta positions of the aryl rings, have been synthesized, characterized and applied in CO/vinyl arene copolymerization reactions. Crystal structures of two neutral Pd-complexes have been solved allowing comparison of the bonding properties of the ligand. Kinetic and mechanistic investigations on these complexes have been performed. The kinetic investigations indicate that in general ligands with electron- withdrawing substituents give more active, but less stable, catalytic systems, although steric effects also play a role. The good performance observed with nonsymmetrical ligands is at least in part due to a compromise between catalyst activity and lifetime, leading to a higher overall productivity with respect to catalysts based on their symmetrical counterparts. Additionally, careful analysis of the reaction profiles provided information on the catalyst deactivation pathway. The latter begins with the reduction of a Pd(II) Ar-BIAN complex to the corresponding Pd(0) species, a reaction that can be reverted by the action of benzoquinone. Then the ligand is lost, a process that appears to be facilitated by the contemporary coordination of an olefin or a CO molecule. The so formed Pd(0) complex immediately reacts with another molecule of the initial Pd(II) complex to give a Pd(I) dimeric species that irreversibly evolves to metallic palladium. Mechanistic investigations performed on the complex with a nonsymmetrical Ar-BIAN probe evidence that the detected intermediates are characterized by the Pd–C bond trans to the Pd–N bond of the aryl ring bearing electron-withdrawing substituents. In addition, the intermediate resulting from the insertion of 4-methylstyrene into the Pd–acyl bond is a five-member palladacycle and not the open-chain η3-allylic species observed for complexes with Ar-BIANs substituted in ortho position

PERCEPÇÃO DOS DISCENTES DE CIÊNCIAS CONTÁBEIS DA UNOESC QUANTO AOS CONCEITOS ABORDADOS NA DISCIPLINA DE METODOLOGIA CIENTÍFICA

Esta pesquisa tem por objetivo analisar a percepção dos discentes do curso de Ciências Contábeis da Universidade do Oeste de Santa Catarina Unoesc, campus de Chapecó, sobre a interpretação dos conceitos abordados na disciplina de Metodologia Científica. A amostra contempla com 64 discentes de Ciências Contábeis que responderam aos instrumento de pesquisa in loco, durante o primeiro semetre de 2017. Na metodologia, optou-se por uma pesquisa descritiva, de levantamento ou survey com uma abordagem quantitativa das informações. Os resultados demostram que os discentes pesquisados adquiriram conhecimentos relacionados as citações em conformidade com as nortas da Associação Brasileira de Normas Técnicas (ABNT), uma vez que as respostas predominantes se concentraram nas opções concordo parcialmente e concordo totalmente. Quando questionados em relação as referências, estes apresentaram conhecimentos parciais a respeito dos exemplos de aplicação das normas utilizados na pesquisa

Coatings of different carbon nanotubes on platinum electrodes for neuronal devices: Preparation, cytocompatibility and interaction with spiral ganglion cells

Cochlear and deep brain implants are prominent examples for neuronal prostheses with clinical relevance. Current research focuses on the improvement of the long-term functionality and the size reduction of neural interface electrodes. A promising approach is the application of carbon nanotubes (CNTs), either as pure electrodes but especially as coating material for electrodes. The interaction of CNTs with neuronal cells has shown promising results in various studies, but these appear to depend on the specific type of neurons as well as on the kind of nanotubes. To evaluate a potential application of carbon nanotube coatings for cochlear electrodes, it is necessary to investigate the cytocompatibility of carbon nanotube coatings on platinum for the specific type of neuron in the inner ear, namely spiral ganglion neurons. In this study we have combined the chemical processing of as-delivered CNTs, the fabrication of coatings on platinum, and the characterization of the electrical properties of the coatings as well as a general cytocompatibility testing and the first cell culture investigations of CNTs with spiral ganglion neurons. By applying a modification process to three different as-received CNTs via a reflux treatment with nitric acid, long-term stable aqueous CNT dispersions free of dispersing agents were obtained. These were used to coat platinum substrates by an automated spray-coating process. These coatings enhance the electrical properties of platinum electrodes, decreasing the impedance values and raising the capacitances. Cell culture investigations of the different CNT coatings on platinum with NIH3T3 fibroblasts attest an overall good cytocompatibility of these coatings. For spiral ganglion neurons, this can also be observed but a desired positive effect of the CNTs on the neurons is absent. Furthermore, we found that the well-established DAPI staining assay does not function on the coatings prepared from single-wall nanotubes. © 2016 Burblies et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.DFG/EXC 1077/1 “Hearing4all

TROTE SOLIDÁRIO 2018/1

O Trote é uma estratégia que objetiva o entrosamento inicial entre os estudantes, servindo como um “quebra gelo”. É um momento descontraído, acompanhado de informações importantes que auxiliarão os calouros na adaptação em sua chegada à Universidade.Neste sentido, os acadêmicos dos Curso de Administração e Ciências Contábeis, com apoio da Coordenadora do curso Profª. Carla Fabiana Cazella e dos professores do curso mobilizaram os acadêmicos da Universidade e a importância da solidariedade, exercício da cidadania, a ética e o trabalho voluntário.Com este propósito os estudantes participaram de uma dinâmica de integração, confraternização e arrecadação de Leite que será doado para a AVRHO. “É um passo relevante para se conscientizarem da importância deste tipo de atividade, e, desta forma, contribuir e valorizar as ações coletivas”, enfatiza a Coordenadora Prof.ª Carla Fabiana Cazella

adreizehn 2013/2014

Zugleich gedruckt erschienen im Universitätsverlag der TU Berlin unter der ISBN 978-3-7983-2745-0, ISSN 2198-6703Das Jahrbuch 'adreizehn 2013/2014' umfasst Studentenarbeiten des 3. und 4. Semesters im Bachelorstudiengang Architektur. Gegenstand der gezeigten Hochbauentwürfe sind exemplarische Vorschläge zur urbanen Nachverdichtung im Zentrum Berlins. Programme verschiedener Nutzungen werden zu Stadtimplantaten verdichtet, die privaten und öffentlichen Raum in hybriden Strukturen neu und beispielgebend verbinden können. Eine Auswahl der besten Arbeiten des Jahrgangs 2013 / 2014 wird mittels Plänen, Schnitten, Ansichten, Modellfotos und Visualisierungen dokumentiert. Ergänzt wird die Publikation durch Texte und Beiträge von Prof. Ute Frank, Prof. Tony Fretton, Prof. Oliver Kruse, Patrick Loewenberg, Erika Mayr, Stéphane Orsolini, Prof. Paul Robbrecht, Prof. Günther VogtYearbook 2013/2014 of department adreizehn for building construction and building design, Faculty VI, Institute for Architecture, Technische Universität Berlin With students' works of the 1st and 2nd year and texts by Prof. Ute Frank, Prof. Tony Fretton, Prof. Oliver Kruse, Patrick Loewenberg, Erika Mayr, Stéphane Orsolini, Prof. Paul Robbrecht, Prof. Günther Vog

Ruthenium Complex Bearing a Hydroxy Group Functionalised N-Heterocyclic Carbene Ligand – A Universal Platform for Synthesis of Tagged and Immobilised Catalysts for Olefin Metathesis

Six olefin metathesis catalysts, based on a common ruthenium precursor featuring a hydroxy-substituted N-heterocyclic carbene ligand, were successfully prepared and fully characterised. As proof-of-concept, two of them ([Ru]isonico and [Ru]dmab) were directly immobilised on a solid support. These non-covalently heterogenised catalysts are efficient in different metathesis reactions and sufficiently stable to be used for repeated runs under batch and continuous flow conditions. In nonpolar media such as n-hexane, the catalytic character of the metathesis reactions is truly heterogeneous, and the contamination of the products with ruthenium is very low. © 2021 The Authors. European Journal of Organic Chemistry published by Wiley-VCH Gmb

EVIDENCIAÇÃO DOS FATORES DE RISCOS NAS EMPRESAS BRASILEIRAS E AMERICANAS DO SETOR DE PAPEL E CELULOSE

O objetivo deste estudo consiste em verificar os fatores de risco evidenciados nas empresas brasileiras e americanas do setor de papel e celulose. Para tanto, realizou-se uma pesquisa descritiva, qualitativa e documental. A população do estudo refere-se a todas as empresas brasileiras e americanas de capital aberto do setor de papel e celulose e, a amostra foi composta por seis empresas brasileiras e sete empresas americanas. O período de análise compreende o ano de 2013. Os resultados encontrados demonstram que as empresas brasileiras evidenciam os fatores de risco relacionados à companhia, ao controlador direto ou indireto, ou grupo de controle, aos acionistas, às controladas e coligadas, aos fornecedores, aos clientes, ao setor de atuação, à regulação do setor de atuação e aos países estrangeiros. Já as empresas americanas evidenciam fatores relacionados às companhias, aos clientes, à concorrência, à regulação do setor de atuação e à segurança dos sistemas de informação.