bluuebunny/crossref_metadata_2025 huggingface dataset:
Information Systems Management in the Supply Chain in an Official Pharmaceutical Laboratory
Authors: Lima de Magalhães Jorge , Moreira Arlene
Published: September 2016

The official pharmaceutical laboratories are strategic to the government in actions such as production of specific medicines (neglected medicines), research and development in new neglected molecules, public policies, price regulators etc.; especially to the health public in Brazilian population. In this sense, it is important that the information's system of the supply chain in this laboratory must have effectiveness of the activities and processes in the in order to cooperate efficiently and effectively with strategic planning. This work aim to analyze the quality of information's in the catalog of materials as a potential instrument to improvement the process purchase flows standardization, economy in purchases and essential information to the decision-makers. A methodology is proposal to the management in the information's system in purchase department with a standard in the quality catalogue in order to subsidize buyers regarding the detailed description of the purchase item and your specifications. The work conceptualizes and highlights the quality of information and its relevance by adding values to the services and products in supply chain of the official pharmaceutical lab. In this case study was shown details of problems from initial quality description to the final acquisition. In conclusion, to promote the management in the quality of the system information of the catalog of materials is necessary. Therefore, it's possible a better supply chain in public entity, even in an official pharmaceutical laboratory.
Information Management for Network Transformation in Industrial Enterprises Associations
Authors: Costa Eric , Soares António Lucas , Pinho de Sousa Jorge , Jamil George Leal
Published: September 2016

There is no doubt that nowadays internationalization is increasingly attractive for companies that want to become more competitive. However, many small and medium enterprises (SMEs) still are resource-constrained, lacking adequate information and facing problems to establish and manage relationships to operate in a sustainable way in international markets. Despite receiving some support from governments and from other institutional entities, these difficulties faced by SMEs call for a stronger support, which can be played by industrial enterprises associations (IEAs). This chapter brings the perspective of five different companies that are associated with IEAs. The main objective is to have their opinion about the role of IEAs as information managers and promoters of collaborations, mainly for internationalization processes. Another objective is to understand the acceptance by these companies regarding the use of collaborative platforms, managed by IEAs, for supporting their information and collaboration management activities.
Learning to Theorize from Practice
Authors: Hodges Thomas E. , Mills Heidi , Blackwell Brett , Scott Julius , Somerall Sally
Published: September 2016

Too often, university methods courses privilege theory and expect teacher candidates to imagine what it means for classroom practice. This chapter illustrates the power of innovative methods courses with embedded field experiences because they are designed to offer intentional and systematic opportunities for teacher candidates to theorize from practice each and every class period. Using as an example Brett, a former teacher candidate and now early career 2nd grade teacher, we illustrate Brett's meaning-making of classroom based experiences both within the teacher education program and into her own classroom as we describe the design of English-language arts and mathematics methods courses for preservice teachers that leverage embedded field experiences.
Alternative and Authentic
Authors: Wagle Tina
Published: September 2016

In this piece, the author describes an alternative teacher certification program to achieve two objectives. The first is to counter an argument that current programs in this category do not fit the criteria of alternative certification pathways that were established in the 1980s. The author will use this established framework (Walsh & Jacobs, 2007) to demonstrate that such programs still frame these criteria. The second objective is to refute the seemingly wide-spread negative perception that alternative teacher certification programs often carry due to the generalization of these types of programs. This will be accomplished by describing SUNY Empire State College's Master of Arts in Teaching Program and demonstrating that it meets the high standards expected from any teacher preparation program. It is the author's hope that stakeholders with an investment in education and in teacher preparation, in particular, will not make unfounded assumptions of alternative preparations and instead understand that there are high quality programs that support the profession of teaching.
Learning to Lead Collaborative Student Groups to Success
Authors: Modell Micah Gideon
Published: September 2016

This chapter discusses the barriers to achieving the myriad benefits often attributed to collaborative group projects. It begins with an explanation of what collaboration is and the value the method offers to both learners and instructors. It then presents a variety of ways in which these projects can fail to achieve their goals and even have a negative effect on student performance, attitudes towards collaboration and self-efficacy. It also explores some of the ethical concerns that accrue when these problems are not addressed. It then explains how instructors can mitigate these problems today.
Fostering Diverse Praxis
Authors: Rodriguez Sanjuana Carrillo , Adams Megan , Zimmer Kate
Published: September 2016

The aim of this chapter is to describe a partnership between a local university and a summer academy that provided a space for pre-service teachers (teacher candidates) to work with students from diverse backgrounds. Teacher candidates in a literacy assessment course assessed and tutored students in this summer academy. The chapter describes the tutoring program and the pre-service teachers' response to a teaching efficacy survey based on the work with students. Findings indicate that after the tutoring experience, teacher candidates felt more competent to engage students and to use literacy strategies with the students.
A Holistic Professional Development Model
Authors: Golden Julie Ellen , Brown Victoria
Published: September 2016

Institutions struggle to develop online curriculum that meets increasing student demands for online education. The explosive growth of online learning necessitates that many higher education faculty transition from a traditional classroom to a web-based format, sometimes with little or no training. This chapter describes a holistic online faculty professional development (PD) model developed through use of a concerns-based adoption model (CBAM). The CBAM model provides an affective and behavioral lens for managing change. Through two of CBAM's components called stages of concern and levels of use, a PD plan was constructed that approaches the transition to distance learning as an ongoing process rather than simply as technology training. The holistic PD model considers each faculty member as an individual with unique needs. Components of the PD model and new Center for E-Learning (CeL) development and program building are explained. Impact on faculty and students and recommendations for program planning and future research are included.
Culturally Relevant Literacy Instruction
Authors: Thornton Natasha A.
Published: September 2016

This study works toward addressing a very critical educational problem in that it seeks to understand how gaining conceptual and pedagogical understandings of culturally relevant pedagogy (CRP) impact shifts in teachers' beliefs and practices. Rather, than considering the impact of CRP on students' educational success, this study examined teachers' changing beliefs and practices as they engaged in professional development on issues related to CRP and literacy instruction. Formative experiment was conducted and continuous, teacher-centered professional development focused on CRP served as the intervention for the study. Findings indicate that theoretical learning, critical self-reflection, collaboration, and longevity are integral to support shifts in teachers' beliefs and practices around CRP. Findings also show that the shifting process is dynamic and complex and occurs differently for individuals. The outcomes of this study suggest that professional learning should considers teachers' beliefs, experiences, and work context during the learning process.
The Unconference
Authors: Shore Rebecca Ann , Morris Debra
Published: September 2016

This chapter traces a brief history of professional development (PD) in P-12 schools from the emergence of the National Staff Development Council (1978), now called Learning Forward, and reviews the evolution of evaluation models from Kirkpatrick (1959) to Guskey (2000). It then traces a brief history of learning theory from Behaviorism to Constructivism, and the impact of the evolving understanding of how we learn on changing professional development delivery. The authors share technological advances from the sciences that have influenced the design and delivery of learning and offer a brain-based approach for delivering PD. A recent phenomenon, the unconference, or EdCamp as some have been called, represents a constructivist approach to professional development which is more closely aligned with brain-based principles of how we learn. (Both authors planned, administered, and evaluated an EdCamp Professional Development day for a program of aspiring high school principals in the spring of 2015.)
Studying Infrastructures of Implementing Organizational Excellence of Model of EFQM at Education Department of Golestan Province
Authors: Abdolshah Mohammad , Norouzi Ali , Dorafshan Seyed Ali
Published: September 2016

To examine the infrastructures of implementing EFQM excellence model in the field of abilities of education department. This is descriptive-survey research and the statistical society of this research is deputies, in charge experts, experts of education department of Golestan province, that total number of 38 persons were elected by classification sampling method. The collected data was analyzed by using descriptive statistics. Research findings show that infrastructures of implementing EFQM model at policy and strategy sector of education department is at maximum level and at partnership and resources section is at minimum level. The present research has attempted to finding out the infrastructures of implementing organizational excellence model of EFQM at education department. Therefore, education organization through focusing on sectors having less infrastructures, attempts to pave the way for implementation of EFQM model.
Aligning Effective Professional Development and Online Learning
Authors: Morewood Aimee L. , Ankrum Julie , Dagen Allison Swan
Published: September 2016

The focus of this chapter is an exploration of the intersection between widely acknowledged and implemented research-based practices for effective PD and a conceptual framework for effective online learning and engagement called the Community of Inquiry (CoI) (Garrision, Anderson, & Archer, 2000). A social constructivist perspective is used to align the characteristics of effective PD (e.g., duration, collaborative participation, active learning, coherence, and content focus) with the three CoI presences (e.g., teaching, social, and cognitive presences). Beyond the alignment of these two conceptual frameworks, practical examples of online tools are discussed for both synchronous and asynchronous online learning contexts within this chapter.
Mathematics Teachers' Perspectives on Professional Development Around Implementing High Cognitive Demand Tasks
Authors: Candela Amber G.
Published: September 2016

This chapter will provide readers with an overview of a professional development created and enacted to support teachers' implementation of high cognitive demand tasks (Smith & Stein, 2011). This multiple case study seeks to give voice to the three seventh grade mathematics teachers who participated in the professional development as they share their perspectives on what factors affected their implementation of high cognitive demand tasks. The goal of this chapter is to provide an overview of the structure of the professional development, share the aspects of the professional development the teachers identified as supportive when planning and implementing high cognitive demand tasks in their mathematics classrooms, and discuss ideas for future professional development aimed at providing teachers with instructional practices to incorporate into classrooms.
Defining Effective Learning Tasks for All
Authors: Buchheister Kelley , Jackson Christa , Taylor Cynthia E.
Published: September 2016

An effective mathematics program may be defined as one in which classroom teachers implement tasks and activities that allow all students opportunities to engage in high levels of mathematical thinking and reasoning (NCTM, 2014). In the chapter, we describe background information regarding the preparation of practicing and prospective teachers when implementing research-based practices in the inclusive classroom. Specifically, we provide explicit background information from the extant literature regarding: 1. Equity, 2. Universal Design for Learning, and 3. How to use games as classroom activities to promote the development of mathematical concepts, skills, and conceptual reasoning.
A New Understanding of our Confusion
Authors: Seals Christopher , Horton Akesha , Berzina-Pitcher Inese , Mishra Punya
Published: September 2016

This chapter discusses the philosophies and practices that drive the MSUrbanSTEM Leadership & Teaching Fellowship Program. This multi-year project offers a professional development program to a selected cohort of K-12 STEM educators from Chicago Public Schools, one of the largest urban districts in the U.S. This chapter provides a holistic view of the program, shares the fellow selection process, and focuses on the strategically developed curriculum and the theoretical bases for the chosen pedagogy. This allows the authors to explore the psychological and philosophical principles, based on the idea of accepting confusion, and embracing failure in beliefs about pedagogy and STEM instruction, which are used to expand the skills and abilities of these selected urban school teachers. Finally, we provide some initial findings about the teachers' growth and development both in their efficacy and leadership abilities.
MÃE DE PRIMEIRA VIAGEM: NARRATIVAS DE MULHERES EM SITUAÇÃO DE VULNERABILIDADE SOCIAL
Authors: Aching Michele Carmona , Biffi Mariana , Granato Tania Mara Marques
Published: September 2016

Considerando pesquisas recentes na área da maternidade que salientam as transformações psicológicas que acompanham o processo de transição para a maternidade e o aumento do número de famílias brasileiras em situação de precariedade social, de acordo com o Mapa de Vulnerabilidade de São Paulo, do Centro de Estudos da Metrópole, buscamos investigar os sentidos afetivo-emocionais atribuídos à experiência da maternidade em situação de vulnerabilidade social. Adotando a narrativa interativa como recurso metodológico, solicitamos a 17 mulheres, entre gestantes e puérperas, moradoras de um alojamento social na cidade de São Paulo, que completassem uma história fictícia, previamente elaborada pelas pesquisadoras, sobre as angústias de uma gestante. As produções narrativas foram psicanaliticamente consideradas e organizadas em campos de sentido afetivo-emocional que comunicam a experiência materna das participantes. Neste trabalho, focalizamos o campo da mãe de primeira viagem, que organiza as produções narrativas das participantes em torno da experiência de ser mãe pela primeira vez. A mãe de primeira viagem é vista por esse grupo de mulheres como insegura, ansiosa e medrosa, mas capaz de construir o seu próprio estilo de ser mãe à medida que cuida do filho, ganhando maturidade e autoconfiança. Os depoimentos das participantes nos convidam a desconstruir concepções sociais preconceituosas acerca das possibilidades de uma maternagem adequada em situação de vulnerabilidade social, e a compreender que o cuidado infantil pode ser viabilizado, também nessa condição, pelo suporte familiar, social e, quando necessário, psicológico, o que sugere a potencialidade de medidas preventivas e interventivas.
SIGNIFICADOS AMBIVALENTES NO PROCESSO DE ADOÇÃO: UM ESTUDO DE CASO
Authors: Valério Tatiana Alves de Melo , Lyra Maria C.D.P.
Published: September 2016

A existência de significados diversos, deflagrando ideias e sentimentos ambivalentes sobre a adoção, no momento atual da sociedade brasileira, é tema deste trabalho. O papel dessa ambivalência é analisado, procurando-se mostrar como ela pode se refletir na decisão de adotar uma criança. Este trabalho aborda a dinâmica que caracteriza a construção de significados, que ocorre na relação entre a sociedade e os indivíduos, ou seja, entre a primeira, concebida como cultura coletiva, e os pretendentes à adoção, constituindo as suas culturas pessoais. A análise de entrevistas realizadas com um casal heterossexual estéril, inscrito no Cadastro Nacional de Adoção (CNA), ilustra esse processo de construção de significados que, no presente caso, resulta em significar “estar inscrito no CNA” como possibilitando tanto esperar a criança desejada, por meio dessa forma legalizada, como poder obter essa criança por meio de quaisquer outras formas não legalizadas. Sugerimos que a tentativa de reduzir a ambivalência, criada pelas mensagens contraditórias coexistentes, desempenha papel central na construção de significados, que orienta as ações escolhidas e as opções adotadas pelos pretendentes à adoção, no momento atual no Brasil.
O discurso construcionista social na prática clínica de terapeutas familiares
Authors: Paula-Ravagnani Gabriela Silveira de , McNamee Sheila , Rasera Emerson Fernando , Guanaes-Lorenzi Carla
Published: September 2016

O campo da terapia familiar (TF) é composto por diferentes propostas teóricas e epistemológicas. Recentemente, o construcionismo social tem contribuído para a configuração de novas práticas em TF, levando a uma maior ênfase nos processos de comunicação no contexto terapêutico. O objetivo deste estudo é investigar a difusão do construcionismo entre terapeutas familiares brasileiros. Participaram 14 terapeutas, homens e mulheres, psicólogos, que realizam atendimentos de famílias e são professores em cursos de formação em TF. Realizamos entrevistas semiestruturadas, que foram gravadas em áudio e transcritas literalmente. A partir das propostas construcionistas para a pesquisa científica, realizamos análise temática das informações. Nas cinco temáticas construídas, discutimos como os participantes descrevem o construcionismo e as implicações advindas em sua prática clínica. Concluímos que a difusão deste está atrelada à atribuição de utilidade aos conceitos teóricos, constituindo-se em porta de entrada para reflexões acerca da atuação clínica e cujas contribuições agregam novos elementos ao posicionamento do terapeuta.
O OUTRO LADO DA PORTA GIRATÓRIA: APOIO COMUNITÁRIO E SAÚDE MENTAL
Authors: Silveira Luísa Horn de Castro , Rocha Cristianne Maria Famer , Rocha Kátia Bones , Zanardo Gabriela Lemos de Pinho
Published: September 2016

A Reforma Psiquiátrica tem como princípio fundamental o cuidado em liberdade e prevê a internação breve em hospital geral apenas quando esgotados os recursos extra-hospitalares. No entanto, as múltiplas reinternações em unidades psiquiátricas ainda são comuns no cotidiano hospitalar. O foco desse estudo está no que acontece para além dos portões do hospital, analisando elementos da vida comunitária dos portadores de sofrimento psíquico e se essas experiências se relacionam de alguma forma com a frequente necessidade de hospitalização. Para tanto, buscou-se investigar a percepção sobre apoio comunitário em usuários com alto número de internações, comparando com a de usuários de primeira internação, na unidade psiquiátrica de um hospital geral de Porto Alegre. Os resultados mostraram que a comunidade é uma potente fonte de ajuda em situações de crise, porém, usuários com múltiplas internações têm essas redes enfraquecidas e um afastamento maior da Atenção Básica, em relação aos usuários de primeira internação. Dessa forma, a família se torna a principal fonte de apoio, o que gera sobrecarga, e o hospital ganha um status diferenciado na vida desses usuários, considerado a única alternativa em situações de crise.
Pull-Out Strength of Screws in Screw Chases: Part 2
Authors: LaBelle James C. , Kissell J. Randolph , Dolby Tanya A.
Published: September 2016

This paper (Part 2 of 2) presents a study of the structural behavior of tension-loaded screws installed in screw chases in extruded aluminum profiles. This connection is commonly used to resist outward wind load on glass in curtainwalls and skylights. See Part 1 for details of the pull-out testing. Two types of chase, each with 1/4 in. (6.35 mm) diameter stainless steel screws were used: a flat chase with AB tapping screws (1/4-14; 14 threads per 25.4 mm) and F tapping screws (1/4-20; 20 threads per 25.4 mm), and a longitudinally ribbed chase with UNC-thread machine screws (1/4-20). The extrusions included six cross-section shapes (three with flat chases and three with ribbed chases) and three alloy-tempers.
Sustainability, Durability and Structural Advantages as Leverage in Promoting Aluminium Structures
Authors: Kosteas Dimitris
Published: September 2016

Light weight as a primary factor in combination with strength and durability properties of aluminium alloys brings financial benefits accruing not only from material procurement but along the whole chain of production, manufacturing, delivery and installation, maintenance and even disposal. A significant contribution in the quest to deliver more value has been the development in the last decade of harmonized design and execution standards, the Eurocodes, National Annexes and adapted codes or recommendations for specific applications. The sustainability issue can be dealt with in a more reliable way due to the comprehensive data tools and comparative analyses available nowadays. Experience with growing numbers of applications also delivers benchmark values for initial cost and maintenance requirements.
The Effects of Friction Stir Welding Parameters on the Characteristics of Banded Structure for Aluminum Alloys
Authors: Zoghlami Mariem , Jahazi Mohammad , Songmene Victor
Published: September 2016

Since the invention of the friction stir welding, several studies have been conducted to understand the influence of process parameters on the microstructural, thermal and mechanical characteristics to improve the weld quality. Banded structures better known under the name of "onion rings" are one of phenomena that appear in the microstructure during this process. The welding parameters leading to their appearance as well as their effect on the quality of the joint are still subject to much research with different conclusions. In this context, the objective of this research work is to determine various characteristics of the ‘onion rings’ and correlate them to processing conditions.
Loss of Adhesion at Al 8006/LDPE Interface in Containers for Food Packaging: A Case Study
Authors: Monetta Tullio , Acquesta Annalisa , Sinagra Ciro , Mitton Donald Bryce , Bellucci Francesco
Published: September 2016

A company recently reported, the unexpected and sudden failure of several containers, fabricated from aluminium 8006 and sealed using a polymeric film. The failure resulted when there was a loss of adhesion at the metal/polymeric lid interface, making the containers unusable. Some preliminary adhesion tests have highlighted that, containers, coming from various production batches and sealed using the same kind of lid, exhibited different adhesion strengths. To investigate the cause of the detachment of the lid from the edge of the container, the following parameters has been considered: (i) the iron content of the Al alloy, (ii) the effect of lubricant oil at the polymeric film/substrate interface, (iii) the topography of the contact surface between the lid and the container. The electrochemical behaviour of Al8006 was investigated by means of potentiodynamic polarization tests, both in an aerated aqueous solution of Na2SO4 (0.5 M) and in an aerated aqueous solution of NaCl (0.6 M). The results revealed a significant increase in corrosion rate for the samples with higher iron content, as well as the negative influence of oil on the surface. Roughness measurements have confirmed the importance of the surface profile: a surface showing Sku>3, provides better adhesion. Metallographic measurements demonstrated that high iron content in the alloy results in the development of numerous corrosion spots and prevents good adhesion between the sealant polymeric film and the aluminium foil.
On the Effects of Hydrothermal Treatments on the Corrosion Resistance of the TSA Anodized AA7475-T761 Alloy
Authors: Almeida Thallis Leal , Queiroz Fernanda Martins , Terada Maysa , Costa Isolda , Capelossi Vera Rosa
Published: September 2016

The effect of hydrothermal treatment time on sealing and corrosion resistance of the AA7475-T761 anodized aluminium alloy has been investigated in this study. The hydrothermal treatments tested are environmental compatible without chromium ions involved. Anodizing was carried out by a tartaric-sulphuric anodizing (TSA) process and this was followed by hydrothermal treatments for partial sealing, in various solutions. The effect of propyleneglycol (PRG) and/or cerium ions in the hydrothermal treatment solution was evaluated. Four treatment times were tested, specifically, 2.5, 5.0, 7.5 and 10 min. The corrosion resistance of the anodized and treated samples was evaluated by Electrochemical Impedance Spectroscopy (EIS) and the anodic layers formed were characterized by Scanning Electron Microscopy (SEM). The EIS results showed that the hydrothermal treatments in solutions with cerium ions resulted in similar impedances for periods of treatment from 5 to 10 min whereas in the solutions with PRG the impedance increased with time of treatment from 2.5 to 10 min showing a slower kinetics of anodic layer sealing. However, the fastest kinetics of sealing were associated to the treatments that combined two steps, one in PRG and other in cerium containing solutions with similar impedances obtained from 2.5 to 10 min of treatment. Surface evaluation by SEM showed that the porosities in the anodic layer were not sealed for the periods of hydrothermal treatments corresponding to 2.5 min. The presence of cerium in hydrothermal treatment had a beneficial effect on the stability of the anodic layer formed and provided a healing effect on the corroding sites.
Products and Process for Guala Closures: An Overview of Aluminum Closures Production and the Drive for Innovation
Authors: Bove Francesco , Tagliabue Carlo , Mittino Maurizio
Published: September 2016

Guala Closures Group is the world leader in the production of aluminum closures for the beverage industry, with interests in the spirits, wine, water, oil, vinegar and pharma market. The company holds 70+ active patents worldwide and the annual gross income is approx. 500M €. Guala Closures Group has been a proven industrial leader in its sector that not only is now the largest manufacturer of caps and closures worldwide with a production capacity of 14+ billion closures per year, but has many times lead the venture for innovation in the industry. The goal of this paper is to expose the production processes that stand behind Guala Closures Group, its products, the technological innovation and its success.The paper will begin with a thorough analysis of the current state of the art for the production process of aluminum closures. Secondly, the analysis will shift onto the key factor to success in the manufacturing world of aluminum closures: Drive for Innovation.
Effect of Experimental Parameters on Passivation Phenomena of Ti6Al4V Alloy in Acid Solution
Authors: Nouicer Elamine , Benlahreche Fatima Zohra , Nouicer Abdelmadjid
Published: September 2016

This paper study the effect of scan rates and imposed potential on the growth of the oxide film on the Ti6Al4V alloy surface in acid solution .Polarization curves, plotted at different scan rates show a large range of passivation, with no occurrence of transpassivation . It was found that the scan rate have not a significant effect on the passivation phenomenon. However, it influences the corrosion potential and the current density. Electrochemical impedance spectroscopy results show that the system behaviour is purely capacitive. The increasing trend in transfer resistance, film thickness and the exponent n with the imposed potential is due to the growth of a passive and compact oxide film.
Hydrothermal Surface Treatments with Cerium and Glycol Molecules on the AA 2024-T3 Clad Alloy
Authors: Dos Santos Wagner Izaltino Alves , Costa Isolda , Tomachuk Célia Regina
Published: September 2016

New treatments for replacement of chromate require lower toxicity and corrosion protection. This study aims to investigate the influence of the combination of a Ce conversion coating (CCCe) with glycol molecules on the corrosion resistance of the AA2024-T3 clad (AA1230). The corrosion resistance of surface treated and untreated samples was evaluated by electrochemical techniques (electrochemical impedance spectroscopy, polarization tests and open circuit potential). These tests were complemented by salt spray tests to accelerate the corrosive effects of weathering. The surfaces were analyzed after corrosion tests by scanning electron microscopy with X-ray energy dispersive detector (SEM - EDX). The results of the CCCe samples in combination with glycol were compared with that of the surface with chromate layer and the results showed that the CCCe treatment is a candidate for replacement of chromating with the advantage that it does not generate toxic residues. The self-healing capacity of the new treatment tested was indicated by the increased formation of corrosion products deposition on top of Fe rich intermetallis in the AA1230 clad with time of exposure to the electrolyte.
End-Plate Connections in Bi-Axial Bending - Measurements
Authors: Mäkinen Jari , Fränti Keijo , Korhonen Matti , Fillion Joshua , Heinisuo Markku
Published: September 2016

In this paper we consider the measurements of bolted end-plate connections of tubular beams with cold-formed hollow rectangular aluminium sections. The motivation for these measurements originates from the fact that the aluminium standard (EN 1999-1-1) [1] does not cover the design of this very frequently used type of connection, where the bolts are located outside the edge-lines of the cross-section, i.e. corner bolts. Many tests and studies regarding this area have been conducted, but this paper brings value to the case where bi-axial bending is applied. The measurements have been carried out and the detailed results shall be shown. In this paper, we will focus on the six measurements where the tubular beams were bent uniaxially and biaxially to these limit points. The tests were stopped when the ultimate limit state was reached. In this case the connection never actually broke, but effectively the joint had lost its load bearing capacity. Some residual capacity still remained, but the displacements were too great resulting in a totally different behavior of the connection. The behavior of this connection is highly non-linear, since aluminium (AW 5754) as a material is strain hardening and the mechanism in the connection changes as the displacements increase.
Evaluation of Rotation Capacity of RHS Aluminium Alloy Beams by FEM Simulation: Temper T4
Authors: Castaldo Paolo , Nastri Elide , Piluso Vincenzo
Published: September 2016

The aim of this work consists in the numerical assessment of the moment-rotation behaviour of RHS aluminium alloy beams subjected to non-uniform bending through an extensive parametric analysis performed by means of FE code ABAQUS investigating the influence of the main geometrical and mechanical parameters. In particular, the influence of the flange slenderness, web stiffness and moment gradient are investigated by adopting the constitutive law proposed by Eurocode 9 based on the Ramberg-Osgood model whose shape factor characterise the hardening behaviour of the material. The investigations concern these factors considered separately as well as their interaction. The results are herein reported with reference to temper T4 and show the importance of some of the investigated parameters on both buckling strength and rotation capacity of aluminium alloy beams.
Numerical/Experimental Research on Welded Joints in Aluminium Truss Girders
Authors: van Hove Dianne , Soetens Frans
Published: September 2016

Welded joints in a 30 meter span aluminium truss girder were investigated numerically and experimentally. Since aluminium design rules for welded K-and N-joints in CHS truss girders were lacking the joints were checked using steel design rules. Calculations showed that the N-joints were governing for chord and brace sizes. Further numerical analysis on the N-joints using ANSYS 11.0 was carried out. Full scale experimental research was successfully carried out for validation of the numerical calculations. It is concluded that steel design rules predict the failure behavior and failure mode of the considered aluminium N-joints well. However, steel design rules overestimate the failure load by 8% for the truss configurations investigated.
Low-Cycle Fatigue Testing of a Novel Aluminum Alloy Buckling-Restrained Brace
Authors: Liu Ye , Zhou Li , Wang Chun Lin
Published: September 2016

Compared with steel buckling-restrained braces, aluminum alloy BRBs show excellent advantages in structures where severe corrosion effects can be expected. At the same time, in order to avoid the effect of welding discussed in the previous research, a novel Aluminum alloy Bamboo-shaped Buckling-Restrained Brace (AL-BBRB) consisting of a bamboo-shaped inner core and an outer hollow circular tube was proposed and tested herein. Parametric studies with design variables including cross-sectional sizes of slubs and length of segments were conducted. A series of low-cycle fatigue tests, containing 4 specimens, were performed to address the low-cycle fatigue behavior of AL-BBRB specimens. According to test results of all specimens, stable hysteretic curves were obtained without any local and overall buckling. Consequently, the hysteretic behavior of AL-BBRB specimens is highly concerned with the design variables. Besides, failure positions of AL-BBRB specimens often concentrates on the end of the segment, which can be exactly predicted. Based on test results of all specimens, AL-BBRB specimens show a promising future for wide application in new or retrofitted buildings/bridges where lack the excellent seismic behavior and durability.
Plate Stability Verifications of Aluminium Plate Girders
Authors: Vigh László Gergely , Abdelkarim Dib
Published: September 2016

The paper focuses on overall and local web plate buckling of longitudinally multi-stiffened aluminium plate girders subjected to compression, bending, shear and transverse loading. The authors completed wide-range bifurcation stability analysis by energy method. Based on the results of the completed parametric study, buckling coefficients are formulated, taking also into account the possible interaction of local and overall buckling. Modifications are proposed for the standard Eurocode calculations of critical loads. Modification in resistance calculation for web crippling is also proposed to take the beneficial effect of curved flange-to-web connection into account. Numerical model is developed for nonlinear static analysis. Virtual experimenting – considering actual material behaviour and imperfections – is invoked for the calibration of the model.
Structural Design and Analysis of Aluminum Dome for Caofeidian Coal Storage
Authors: Zhang Ze Chao , Liu Hong Bo , Wang Xiao Dun , Yan Xiang Yu , Yu Jing Hai , Chen Zhi Hua
Published: September 2016

The upper part of Caofeidian coal storage was approximately hemispherical aluminum shell, covered with aluminum alloys plate. The capsule was made of aluminum alloys material, and its span was 125 meters. In the design, according to TEMCOR joint, we used the finite element software MIDAS to build the accurate geometry models and calculation models of aluminum alloys single layer latticed dome structures. By the combination of constant loads, live loads, snow load, wind load, temperature effect and other working conditions, we summarized the consumption of aluminum of the structures, and studied the structural internal force, structural deformation and structural stiffness. In addition, the X and Y two different direction seismic dynamic load was applied to the structure. The structural seismic performance under two kinds of modes were studied through the structure mode analysis of the vibration frequency. The vierendeel dome and single layer dome were controlled by the stability. ANSYS three-dimensional frame element model were set up, and the eigenvalue buckling analysis was carried out. By the geometrical nonlinear finite element method, combining with initial imperfections and material nonlinear, we found out the stability coefficient and the weak parts of the structure.
Lateral Torsional Buckling of Split Aluminium Mullion
Authors: Skejić Davor , Lukić Mladen , Buljan Nebojša , Vido Hrvoje
Published: September 2016

Curtain wall industry is the major user of aluminium as a structural material in buildings, with two basic curtain wall systems: stick and unitised. The latter is preassembled in shops, with the main feature that frame profiles are split in two interlocking halves. Such cross sections are complex, open and prone to lateral torsional buckling. General formulas for the calculation of elastic critical moment for lateral-torsional buckling are provided in the EN 1999-1-1, with a long and complicated procedure for non-symmetrical sections which makes it pretty impractical for everyday use. The problem of such sections can also be assessed by FEM modelling, which is a time consuming and complex process. Curtain wall industry is in a need of a swift, if approximate and conservative, method for checking the risk of lateral torsional buckling of profiles with non-symmetrical cross sections. Some available analytical methods are applied on a practical example and their results compared to those obtained using FEM modelling.
Turning and Drilling Machinability of Recycled Aluminum Alloys
Authors: Mandatsy Moungomo Jean Brice , Nganga Kouya Donatien , Songmene Victor
Published: September 2016

A great deal of effort and research has been dedicated to recycled aluminum alloys, mainly to recycling processes and to the mechanical properties of recomposed parts; however, very limited work has been oriented towards the machinability of recycled aluminum materials. Recycled and recomposed aluminum parts sometimes need machining to obtain the final usable part shape and for assembly purposes. The acceptability of using recycled materials in design and engineering applications depends not only on their mechanical properties, but also on their machinability. This paper investigates the machinability of recycled aluminum alloys based on surface finish, cutting forces and chip formation. Two recycled foundry aluminum alloys were used: one from aluminum can covers and another from aluminum chips produced during machining. The machining operations investigated included turning and drilling under dry and wet conditions. The two tested recycled aluminum alloys showed different machinability behaviors and different part quality characteristics, suggesting that it would be desirable to consider separating aluminum wastes and chips considered for recycling by origin or type prior to melting and recasting.
Advanced External Sulfate Attack Testing and Performance Specifications: Different Sample Geometries Testing
Authors: Massaad Georges , Roziere Emmanuel , Loukili Ahmed , Izoret Laurent
Published: September 2016

External sulfate attacks induce severe deterioration of concrete because of several phenomena: leaching, precipitation of expansive products, aggregates loss, and cracking. A new methodology has been developed to assess sulfate resistance of cement-based materials. We can actually estimate the nature of leached and precipitated minerals, and the microscopic volume variations due to each of the principal sulfate attack phenomena, from relatively simple monitoring parameters: sample mass, hydrostatic weighing, and the amount of leached hydroxide. Quantitative information is given on the mineralogical volume or mass variations, leading us to a phenomena decoupling and a better understanding of the sulfate attack mechanism. After we established the microscopic volume variation scenario, we defined a new performance criterion, the averaged density, capable to describe the tested sample performance variation according to the sample internal state indications given by this criterion. We applied the developed strategy on three different filled and hollow geometries in order to study the effect of the sample geometry on sulfate attack mechanism. The study shows almost the same degradation mechanism: the same microscopic volume variations entrained by the different sulfate attack phenomena. However the hollow tubes promote different precipitated mineral than the two others geometries, due to the different ionic and pH profiles between filled and hollow samples which affects the nature of formed sulfate minerals.
Solid Mass Fractal Model for Pore Structure in Cement Paste
Authors: Gao Yun , Mu Song , Jiang Jin Yang
Published: September 2016

Though discussed a lot, it remains a practical challenge to modeling pore structure in cement paste. The fractal approach shows a great advantage since it allows to generate complex pore structure via simple geometric iterations and to incorporate the wide scope of pores in a self-similar manner. In this paper, the solid mass fractal model is proposed for pore structure in cement paste. The parametric analysis is performed in conjunction with the porosimetric test. It is shown that the proposed solid mass fractal well describes pore structure in cement paste.
Age-Dependent Lattice Discrete Particle Model for Quasi-Static Simulations
Authors: Wendner Roman , Nincevic Kresimir , Boumakis Ioannis , Wan Lin
Published: September 2016

For decades, concrete plays an important role worldwide as a structural material. Construction planning and reliability assessment require a thorough insight of the effects that determine concrete lifetime evolution. This study shows the experimental characterization as well as the results of subsequent aging simulations utilizing and coupling a Hygro-thermo-chemical (HTC) model and the Lattice Discrete Particle Model (LDPM) with aging effects for concretes at various early ages. The HTC component of the computational framework allows taking into account any form of environmental curing conditions as well as known material constituents and predicts the level of concrete maturity. Mechanical response and damage are captured by the well-established LDPM, which is formulated in the framework of discrete meso-scale constitutive models. The chemo-mechanical coupling is accomplished by a set of aging functions that link the meso-scale material properties to an effective aging degree, accounting for cement hydration, silica fume reaction, polymerization, and temperature effects. After introducing the formulations the framework is applied to experimental data of 3 standard low and higher strength concretes. Investigated tests include two types of unconfined compression, Brazilian splitting, three-point-bending, and wedge splitting. Following the model calibration the framework is validated by purely predictive simulations of structural level experimental data obtained at different ages for the same concretes.
Diffusivity in Cement-Silica Fume Based Materials: Experimental and Computer Modeling Results on Mortars
Authors: Bajja Z. , Dridi W. , Darquennes A. , Bennacer R.
Published: September 2016

Silica fume cement (SFC) based materials are largely used as a containment barrier for nuclear waste management. The safety of this storage mode depends on the knowledge of the effective diffusion coefficients of such materials.
This work proposes a combination of computer models able to estimate the diffusion coefficients of SFC pastes and mortars, from a single investigation of the microstructure by nitrogen adsorption.
The approach used consists firstly in manufacturing SFC mortars by varying sand volume fraction from 30 to 65% while silica fume replacement and water to binder ratio were respectively set at 10% and 0.4. Nitrogen adsorption tests were then performed and collected data on C-S-H nature are introduced into a SFC pastes hydration model. The latter provides the mineral composition which is an input parameter in the multilayer transport model that estimates the effective diffusion coefficient (De) of cement pastes. For mortars, a 3D biphasic model (sand and cement matrix) was used to compute the (De) of mortars at different inclusion volume fractions.
The numerical results were approved by comparison to experimental data obtained from tritiated water (HTO) diffusion tests performed on manufactured mortars.
Concrete Carbonation in Mexico and Spain: DURACON Project, Four Year Evaluation
Authors: Moreno Eric Ivan , Torres-Acosta Andres , Pérez-Quiroz Jose Trinidad , Martínez-Madrid Miguel , Molina Wilfrido Martínez , Alonso-Guzmán Elia , Castro-Borges Pedro , Genescá-Llongueras Juan , Valdez-Salas Benjamin , Ariza-Aguilar Luis Eduardo , Baltazar Miguel , Nieves Demetrio , Almeraya-Calderón Facundo , Gaona-Tiburcio Citlali , Pérez-López Tezozomoc , López-Vázquez Esteban , Rodriguez Jorge , Rebolledo Nuria , Andrade Carmen , Troconis-Rincón Oladis
Published: September 2016

This work is part of the DURACON Ibero-American project, which seeks to characterize concrete durability under environmental conditions, based on reinforced concrete sample exposure in at least two different atmospheres (marine and urban), for each of the 11 countries in the project. Specimens were exposed to the environmental conditions of 13 Mexican sites (8 urban and 5 marine atmospheres). Concrete specimens were 15 x 15 x 30 cm, with 6 rebars each, and three concrete covers (15, 20 and 30 cm). Two concrete mixtures were used with water/cement ratios of 0.45 and 0.65, respectively. Six reinforced and six plain concrete specimens were placed on each exposure site. Environmental data was collected on each exposure site, including rainfall, relative humidity, time of wetness, temperature, wind velocity, and carbon dioxide/chloride concentrations. Corrosion rates and potentials, as well as concrete resistivity were measured in the reinforced samples. Carbonation depths were measured on the plain ones. The present work focused on the measurements of environmental parameters during the first two years of exposure to analyze the potentiality and the probability of carbonation-induced corrosion, and the evaluation of the corrosion initiation period for the reinforcing steel on the 13 Mexican exposure sites.