820 resultados para Asbestos in building


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This study used a cross-sectional design and descriptive research methodology to assess the characteristics and practices of employers participating in Florida school-to-work (STW) initiatives, the factors influencing their participation, and their STW partnerships with schools. The study also examined the relationships between employer characteristics and participation. ^ A sampling frame of 15,202 employers from the 28 Florida STW regions was constructed. Data were collected via a mail survey with a random sample of employers, using a researcher-designed questionnaire. Data were analyzed using descriptive statistics, correlational analysis, and analysis of variance. ^ At the 95% confidence level, it was estimated that the mean establishment size in the population is between 25 and 51 employees and that employers have been involved in STW partnerships between five and seven years. ^ The study revealed broad-based employer participation in three of four areas: Working with Students, Working with Educators, and Internal Company Practices Supporting STW. A fourth area, Building a System, showed generally low participation. Data indicate that workforce needs are important incentives to employer STW participation beyond their desire to contribute to education or the community. Data also indicate that lack of information on STW is the greatest barrier to employer participation. ^ Sample employers have more positive perceptions of the value of their partnerships with schools than of the quality of the partnerships. Ninety-four percent agreed that students are better prepared for work and careers as a result of the partnership's activities. More than half agreed that a sense of trust and good communication exist between educators and employer partners. ^ Employer variables found to have a significant, positive relationship with participation include size (coefficient of determination r2 = .116), years in STW partnerships (r2 = .128), and perceptions of partnership quality (r2 = .092) and value (r2 = .112). ^ A major conclusion based on the findings of this study is that employer participation is optimized in initiatives that achieve important STW outcomes for students and build long-term relationships between employers and schools. Another that in Florida, the STW Opportunities Act of 1994 has not resulted in substantially greater employer involvement in building a STW system. ^

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Construction projects are complex endeavors that require the involvement of different professional disciplines in order to meet various project objectives that are often conflicting. The level of complexity and the multi-objective nature of construction projects lend themselves to collaborative design and construction such as integrated project delivery (IPD), in which relevant disciplines work together during project conception, design and construction. Traditionally, the main objectives of construction projects have been to build in the least amount of time with the lowest cost possible, thus the inherent and well-established relationship between cost and time has been the focus of many studies. The importance of being able to effectively model relationships among multiple objectives in building construction has been emphasized in a wide range of research. In general, the trade-off relationship between time and cost is well understood and there is ample research on the subject. However, despite sustainable building designs, relationships between time and environmental impact, as well as cost and environmental impact, have not been fully investigated. The objectives of this research were mainly to analyze and identify relationships of time, cost, and environmental impact, in terms of CO2 emissions, at different levels of a building: material level, component level, and building level, at the pre-use phase, including manufacturing and construction, and the relationships of life cycle cost and life cycle CO2 emissions at the usage phase. Additionally, this research aimed to develop a robust simulation-based multi-objective decision-support tool, called SimulEICon, which took construction data uncertainty into account, and was capable of incorporating life cycle assessment information to the decision-making process. The findings of this research supported the trade-off relationship between time and cost at different building levels. Moreover, the time and CO2 emissions relationship presented trade-off behavior at the pre-use phase. The results of the relationship between cost and CO2 emissions were interestingly proportional at the pre-use phase. The same pattern continually presented after the construction to the usage phase. Understanding the relationships between those objectives is a key in successfully planning and designing environmentally sustainable construction projects.

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Combinatorial designs are used for designing key predistribution schemes that are applied to wireless sensor networks in communications. This helps in building a secure channel. Private-key cryptography helps to determine a common key between a pair of nodes in sensor networks. Wireless sensor networks using key predistribution schemes have many useful applications in military and civil operations. When designs are efficiently implemented on sensor networks, blocks with unique keys will be the result. One such implementation is a transversal design which follows the principle of simple key establishment. Analysis of designs and modeling the key schemes are the subjects of this project.

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Drawing upon critical, communications, and educational theories, this thesis develops a novel framing of the problem of social risk in the extractive sector, as it relates to the building of respectful relationships with indigenous peoples. Building upon Bakhtin’s dialogism, the thesis demonstrates the linkage of this aspect of social risk to professional education, and specifically, to the undergraduate mining engineering curriculum, and develops a framework for the development of skills related to intercultural competence in the education of mining engineers. The knowledge of social risk, as well as the level of intercultural competence, of students in the mining engineering program, is investigated through a mixture of surveys and focus groups – as is the impact of specific learning interventions. One aspect of this investigation is whether development of these attributes alters graduates’ conception of their identity as mining engineers, i.e. the range and scope of responsibilities, and understanding of to whom responsibilities are owed, and their role in building trusting relationships with communities. Survey results demonstrate that student openness to the perspectives of other cultures increases with exposure to the second year curriculum. Students became more knowledgeable about social dimensions of responsible mining, but not about cultural dimensions. Analysis of focus group data shows that students are highly motivated to improve community perspectives and acceptance. It is observed that students want to show respect for diverse peoples and communities where they will work, but they are hampered by their inability to appreciate the viewpoints of people who do not share their values. They embrace benefit sharing and environmental protection as norms, but they mistakenly conclude that opposition to mining is rooted in a lack of education rather than in cultural values. Three, sequential, threshold concepts are identified as impeding development of intercultural competence: Awareness and Acknowledgement of Different Forms of Knowledge; Recognition that Value Systems are a Function of Culture; Respect for varied perceptions of Social Wellbeing and Quality of Life. Future curriculum development in the undergraduate mining engineering program, as well as in other educational programs relevant to the extractive sector, can be effectively targeted by focusing on these threshold concepts.

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Global warming, energy savings, and life cycle analysis issues are factors that have contributed to the rapid expansion of plant-based materials for buildings, which can be qualified as environmental-friendly, sustainable and efficient multifunctional materials. This review presents an overview on the several possibilities developed worldwide about the use of plant aggregate to design bio-based building materials. The use of crushed vegetal aggregates such as hemp (shiv), flax, coconut shells and other plants associated to mineral binder represents the most popular solution adopted in the beginning of this revolution in building materials. Vegetal aggregates are generally highly porous with a low apparent density and a complex architecture marked by a multi-scale porosity. These geometrical characteristics result in a high capacity to absorb sounds and have hygro-thermal transfer ability. This is one of the essential characteristics which differ of vegetal concrete compared to the tradition mineral-based concretes. In addition, the high flexibility of the aggregates leads to a non-fragile elasto-plastic behavior and a high deformability under stress, lack of fracturing and marked ductility with absorbance of the strains ever after having reached the maximum mechanical strength. Due to the sensitivity to moisture, the assessment of the durability of vegetal concrete constitutes one of the next scientific challenging of bio-based building materials.

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Increasing energy efficiency in the residential sector, while maintaining adequate home ventilation for health and well-being, is proving to be a challenge. This study assesses the efficacy of passive ventilation strategies designed to comply with building regulations and imposed after housing energy-efficiency retrofits. In particular, it focuses on the provision of ventilation using background through-wall vents, which remains a common strategy in a number of European countries including Ireland and the UK, where vent sizes, related to floor area, are stipulated in building regulations. A collective of social housing, with background through-wall vents installed post thermal retrofit, is taken as a case study. These homes are modelled to interrogate the impact of the passive ventilation strategy on house air exchange rate and thermal heating energy loads. The reaction of occupants to through-wall vent installation is decidedly negative and many block vents to limit thermal discomfort and heat loss. Simulation studies show significant external air ingress through vents. A wide range of effective air change rates are observed when vents are sized without reference to building airtightness, and significant energy penalties result for the leakier homes. This study evaluates the provision of passive through-wall ventilation as part of a retrofit programme and shows it to have a number of drawbacks that may impact on the health of the building and its occupants and ultimately be at odds with the aims of achieving energy efficiency in the residential sector.

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To get a better insight into the radiological features of industrial by-products that can be reused in building materials a review of the reported scientific data can be very useful. The current study is based on the continuously growing database of the By-BM (H2020-MSCA-IF-2015) project (By-products for Building Materials). Currently, the By-BM database contains individual data of about 431 by-products and 1095 building and raw materials. It was found that in case of the building materials the natural radionuclide content varied widely (Ra-226: <DL-27851 Bq/kg; Th-232: <DL-906 Bq/kg, K-40: <DL-17922 Bq/kg), more so than for the by-products (Ra-226: 7-3152 Bq/kg; Th-232: <DL-1350 Bq/kg, K-40: <DL-3001 Bq/kg). The average Ra-226, Th-232 and K-40 contents of the reported by-products were respectively 2.52, 2.35 and 0.39 times higher than the building materials. The gamma exposure of bulk building products was calculated according to IAEA Specific Safety Guide No. SSG-32 and the European Commission Radiation Protection 112 based I-index (EU BSS). It was found that in most cases the I-index without density consideration provides a significant overestimation in excess effective dose.

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This interactive symposium will focus on the use of different technologies in developing innovative practice in teacher education at one university in England. Technology Enhanced Learning (TEL) is a field of educational policy and practice that has the power to ignite diametrically opposing views and reactions amongst teachers and teacher educators, ranging across a spectrum from immense enthusiasm to untold terror. In a field where the skills and experience of individuals vary from those of digital natives (Prensky 2001) to lags and lurkers in digital spaces, the challenges of harnessing the potential of TEL are complex. The challenges include developing the IT skills of trainees and educators and the creative application of these skills to pedagogy in all areas of the curriculum. The symposium draws on examples from primary, secondary and post-compulsory teacher education to discuss issues and approaches to developing research capacity and innovative practice using different etools, many of which are freely available. The first paper offers theoretical and policy perspectives on finding spaces in busy professional lives to engage in research and develop research-informed practice. It draws on notions of teachers as researchers, practitioner research and evidenc-ebased practice to argue that engagement in research is integral to teacher education and an empowering source of creative professional learning for teachers and teacher educators. Whilst acknowledging the challenges of this stance, examples from our own research practice illustrate how e-tools can assist us in building the capacity and confidence of staff and students in researching and enhancing teaching, learning and assessment practice. The second paper discusses IT skills development through the TEL pathway for trainee teachers in secondary education across different curriculum subjects. The lead tutor for the TEL pathway will use examples of activities developed with trainee teachers and university subject tutors to enhance their skills in using e-tools, such as QR codes, Kahoot, Padlet, Pinterest and cloud based learning. The paper will also focus on how these skills and tools can be used for action Discussant - the wider use of technologies in a university centre for teacher education; course management, recruitment and mentor training. research, evaluation and feedback and for marking and administrative tasks. The discussion will finish with thoughts on widening trainee teachers’ horizons into the future direction of educational technology. The third paper considers institutional policies and strategies for promoting and embedding TEL, including an initiative called ‘The Learning Conversation’, which aims ‘to share, highlight, celebrate, discuss, problematise, find things out...’ about TEL through an online space. The lead for ‘The Learning Conversation’ will offer reflections on this and other initiatives across the institution involving trainee teachers, university subject tutors, librarians and staff in student support services who are using TEL to engage, enthuse and support students on campus and during placements in schools. The fourth paper reflects on the use of TEL to engage with trainee teachers in post-compulsory education. This sector of education and training is more fragmented than primary and secondary schools sectors and so the challenges of building a community of practice that can support the development of innovative practice are greater.

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Les élections post-conflit ou élections de sortie de crise organisées sous l’égide de la communauté internationale en vue de rétablir la paix dans les pays sortant de violents conflits armés ont un bilan mixte caractérisé par le succès ou l’échec selon les cas. Ce bilan mitigé représente le problème principal auquel cette recherche tente de répondre à travers les questions suivantes : l’assistance électorale étrangère est-elle efficace comme outil de rétablissement de la paix dans les sociétés post-conflit? Qu’est ce qui détermine le succès ou l’échec des élections post-conflit à contribuer efficacement au rétablissement de la paix dans les sociétés déchirées par la guerre? Pour résoudre cette problématique, cette thèse développe une théorie de l’assistance électorale en période post-conflit centrée sur les parties prenantes à la fois du conflit armé et du processus électoral. Cette théorie affirme que l’élément clé pour le succès des élections post-conflit dans le rétablissement de la paix est le renforcement de la capacité de négociation des parties prenantes à la fois dans le processus de paix et dans le processus électoral post-conflit. Dans les situations post-conflit, une assistance électorale qui se voudrait complète et efficace devra combiner à la fois le processus électoral et le processus de paix. L’assistance électorale sera inefficace si elle se concentre uniquement sur les aspects techniques du processus électoral visant à garantir des élections libres, transparentes et équitables. Pour être efficace, l’accent devra également être mis sur les facteurs supplémentaires qui peuvent empêcher la récurrence de la guerre, tels que l’habilité des individus et des groupes à négocier et à faire des compromis sur les grandes questions qui peuvent menacer le processus de paix. De fait, même des élections transparentes comme celles de 1997 au Liberia saluées par la communauté internationale n’avaient pas réussi à établir des conditions suffisantes pour éviter la reprise des hostilités. C’est pourquoi, pour être efficace, l’assistance électorale dans les situations de post-conflit doit prendre une approche globale qui priorise l’éducation civique, la sensibilisation sur les droits et responsabilités des citoyens dans une société démocratique, le débat public sur les questions qui divisent, la participation politique, la formation au dialogue politique, et toute autre activité qui pourrait aider les différentes parties à renforcer leur capacité de négociation et de compromis. Une telle assistance électorale fera une contribution à la consolidation de la paix, même dans le contexte des élections imparfaites, comme celles qui se sont détenues en Sierra Leone en 2002 ou au Libéria en 2005. Bien que la littérature sur l’assistance électorale n’ignore guère l’importance des parties prenantes aux processus électoraux post-conflit (K. Kumar, 1998, 2005), elle a fortement mis l’accent sur les mécanismes institutionnels. En effet, la recherche académique et professionnelle est abondante sur la réforme des lois électorales, la reforme constitutionnelle, et le développement des administrations électorales tels que les commissions électorales, ainsi que l’observation électorale et autres mécanismes de prévention de la fraude électorale, etc. (Carothers & Gloppen, 2007). En d’autres termes, les décideurs et les chercheurs ont attribué jusqu’à présent plus d’importance à la conception et au fonctionnement du cadre institutionnel et des procédures électorales. Cette thèse affirme qu’il est désormais temps de prendre en compte les participants eux-mêmes au processus électoral à travers des types d’assistance électorale qui favoriseraient leur capacité à participer à un débat pacifique et à trouver des compromis aux questions litigieuses. Cette approche plus globale de l’assistance électorale qui replace l’élection post-conflit dans le contexte plus englobant du processus de paix a l’avantage de transformer le processus électoral non pas seulement en une expérience d’élection de dirigeants légitimes, mais aussi, et surtout, en un processus au cours duquel les participants apprennent à régler leurs points de vue contradictoires à travers le débat politique dans un cadre institutionnel avec des moyens légaux et légitimes. Car, si le cadre institutionnel électoral est important, il reste que le résultat du processus électoral dépendra essentiellement de la volonté des participants à se conformer au cadre institutionnel et aux règles électorales.

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With the increasing importance given to building rehabilitation comes the need to create simple, fast and non-destructive testing methods (NDT) to identify problems and for anomaly diagnosis. Ceramic tiles are one of the most typical kinds of exterior wall cladding in several countries; the earliest known examples are Egyptian dating from 4000 BC. This type of building facade coating, though being quite often used in due to its aesthetic and architectural characteristics, is one of the most complex that can be applied given the several parts from which it is composed; hence, it is also one of the most difficult to correctly diagnose with expeditious methods. The detachment of ceramic wall tiles is probably the most common and difficult to identify anomaly associated with this kind of cladding and it is also definitely the one that can compromise security the most. Thus, it is necessary to study a process of inspection more efficient and economic than the currently used which often consist in semi-destructive methods (the most common is the pull off test), that can only be used in a small part of the building at a time, allowing some assumptions of what can the rest of the cladding be like. Infrared thermography (IRT) is a NDT with a wide variety of applications in building inspection that is becoming commonly used to identify anomalies related with thermal variations in the inspected surfaces. Few authors have studied the application of IRT in anomalies associated with ceramic claddings claiming that the presence of air or water beneath the superficial layer will influence the heat transfer in a way that can be detected in both a qualitative and a quantitative way by the thermal camera, providing information about the state of the wall in a much broad area per trial than other methods commonly used nowadays. This article intends to present a review of the state of art of this NDT and its potentiality in becoming a more efficient way to diagnose anomalies in ceramic wall claddings.

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The principalship has changed significantly over the past 20 years. Today’s principals must be effective instructional leaders, managers of large facilities, and experts at analyzing data to successfully meet the accountability demands of high-stakes testing, along with state, and federal mandates. The primary purpose of this quantitative study was to examine how 43 first- and second-year sitting school principals perceived their mentoring experiences and the degree to which a principal mentoring program—offered by their large urban school district—was effective in building their leadership capacity. A second purpose of this inquiry was to understand these principals’ perceptions of the most beneficial aspects of the mentoring program. The study used quantitative data gathered via an online questionnaire distributed during Fall 2015. The results indicated that respondents perceived that the components of the large urban school-mentoring program were generally effective in training principal mentees to become highly-effective school leaders. This study enriches the literature on mentoring by providing the voices of first and second year school leaders to add depth to the characteristics of successful mentoring programs.

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El objetivo de esta comunicación es dar a conocer el proyecto ERASMUS+ Inside out- Outside In- Building bridges in teacher education through encounters with diversity en el que participan ocho instituciones europeas de formación de profesores de Alemania, Austria, España, Estonia, Finlandia, Hungría, Reino Unido y Suecia, que es la coordinadora. Uno de los retos que deben afrontar los sistemas educativos en el futuro inmediato es sin duda la diversidad cultural del alumnado, en sentido amplio, ya que consideramos que esa diversidad no viene dada sólo por la lengua, procedencia, religión o etnia del alumnado, sino también por las expectativas y valores con que se enfrentan a la educación. Esos diferentes valores están en la base de gran parte del abandono escolar temprano, cuya reducción es uno de los objetivos que se ha marcado la Unión Europea. Esa tasa es en España la más alta de Europa, aunque con enormes diferencias de unas Comunidades Autónomas a otras. Los movimientos migratorios de población de dentro y fuera de la Unión Europea, unidos a la llegada de refugiados, están cambiando la fisonomía de nuestras aulas y exigen de todos los que nos dedicamos a la docencia en todos los niveles cambios para responder a las nuevas demandas. Los conceptos de arraigo y desarraigo (insideness and outsideness) son básicos por sus implicaciones en la creación de espacios de aprendizaje que se reconozcan como tales y que puedan serlo realmente; además, implican romper las fronteras entre educación formal y no formal de forma que cualquier momento y cualquier espacio puedan convertirse en espacios y tiempos educativos.

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This research was motivated by the requirement of asbestos s replacement in building systems and the need to generate jobs and income in the country side of the state of Bahia, Brazil. The project aimed at using fibers from licuri leaves (syagrus coronata), an abundant palm in the region, to produce composites appropriate for the sustainable production of cement fibre reinforced products in small plants. The composites were produced in laboratory using Portland cement CP-II-F32, sand, water, licuri palm fiber contents of 1.0, 1.5 and 2.0% by weight of binder (two different fiber length) and metakaolin. The latter was chosen as an additional binder for its efficiency to reduce the alkalinity of cementitious matrixes therefore preventing the degradation of vegetable fibers. The characterization of the composite components was carried out by sieving and laser particle size analyses, thermal analysis, fluorescence and X-ray diffraction. The composites performance was evaluated by 3- point-bending tests, compressive strength, ultrasound module of elasticity, free and restrained shrinkage, water capillarity absorption and apparent specific gravity. It has been found that the addition of fibers increased the time to onset of cracking over 200.00% and a 25% reduction in cracks opening in the restrained shrinkage test. The capillary absorption reduced about 25% when compared to fiber-free composites. It was also observed with regard to flexural strength, compressive strength and specific gravity, that the addiction of fibers did not affect the composite performance presenting similar results for compounds with and without fibers. In general it can be stated that the reinforced composite fibers of palm licuri presents physical and mechanical characteristics which enable them to be used in the intended proposals of this research

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Abstract Background: Communication is a basic tool in nursing, a crucial element of care. The quality of the interactions that take place between the nurse and the user/family influence their satisfaction and security felt with the care received. Objectives: To identify the communication skills and interpersonal relationship of nursing students in health care; identify the sociodemographic and academic variables influencing communication skills and interpersonal relationship of nursing students in health care. Methodology: Quantitative study, cross-sectional, descriptive and correlational. The data collection instrument was a questionnaire with questions concerning the socio-demographic and academic characterization; basic skills of interview and clinical communication in health care; learning of clinical communication skills and range of communication skills and interpersonal relationship. The sample consisted of 374 nursing students from two Portuguese schools. Results: The majority were female (80.5%), in the age group of 18-21 years. The students recognize the importance of clinical communication skills and interpersonal relations in nursing practice (82.4%); agreed on the teaching methods of communicational skills (54.3%). Evaluated their training in the area as good (71.7%). Age, semester and school influenced communication skills and interpersonal relationship of students (p <0.5) Conclusion: The results obtained allow us to state that the education / training of nursing student in the relational context is of fundamental importance in building capacity for competent professional practice.

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Community development is centrally concerned with people in communities working together to achieve a common goal, that is, to collaborate, whether within local geographical communities, in communities of shared interests or among groups sharing a common identity. Its overarching goal is one of progressive transformational social change. As Belfast transitions from a conflict to a post-conflict society, there is a need for greater, more effective work at local community level in order to address a range of ongoing social and economic issues facing communities, including high levels of disadvantage and division. Given the significance of leadership in building effective collaboration and the centrality of collaboration for community development, it is important to understand how leadership is currently enacted and what kinds of leadership are required to support communities to collaborate effectively to bring about social change. This thesis thus centers on the kind of leadership practised and required to support collaboration for social change within the community sector in Belfast, a city that contains an estimated 28% of the total number of community and voluntary sector (CVS) organisations in Northern Ireland (Northern Ireland Council for Voluntary Action, 2012). Through a series of qualitative, in-depth interviews with people playing leadership roles in local communities, the study critically explores and analyses their experiences and perceptions in relation to leadership and collaboration. Community development in Belfast today is practised within a wider context of neoliberal policies, characterised by austerity and public spending cuts. Whilst not the only influencing factor, this context has had a particular and profound impact on the nature and role of community development practised, and on the kind of leadership enacted within it. The space for reflection and transformative action appears to be shrinking as the contraction of resources to support community development in local communities continues unabated. Those playing leadership roles increasingly find themselves compelled to spend time seeking resources and managing complex funding arrangements rather than focusing on the social change dimensions of their work. Collaboration as promoted by the state seems to have become an instrumental tactic used to implement its austerity measures and curtail the potential of the community sector. Despite this, local leaders are driving initiatives that attempt to push back, helping the sector refocus on its transformational goals of social change. To do this requires support. Those playing leadership roles require resources, including time, to encourage and enable communities to reconnect with the purpose and underpinning values of community development. Leaders also need support to develop and promote new, progressive narratives and visions and pursue these through building collaboration and solidarity.