942 resultados para Asphalt in hydraulic engineering.
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Combined annual reports of companies which administer railroads, navigation companies, turnpikes, etc.
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Mode of access: Internet.
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Prepared by Rathbun Associates for the U.S. Army Corps of Engineers, Little Rock District.
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Mode of access: Internet.
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Thesis (Ph.D.)--University of Washington, 2016-06
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Stem cells, either from embryonic or adult sources, have demonstrated the potential to differentiate into a wide range of tissues depending on culture conditions. This makes them prime candidates for use in tissue engineering applications. Current technology allows us to process biocompatible and biodegradable polymers into three-dimensional (3D) configurations, either as solid porous scaffolds or hydrogels, with controlled macro and/or micro spatial geometry and surface chemistry. Such control provides us with the ability to present highly controlled microenvironments to a chosen cell type. However, the precise microenvironments required for optimal expansion and/or differentiation of stem cells are only now being elucidated, and hence the controlled use of stem cells in tissue engineering remains a very young field. We present here a brief review of the current literature detailing interactions between stem cells and 3D scaffolds of varying morphology and chemical properties, concluding with remaining challenges for those interested in tissue engineering using tailored scaffolds and stem cells.
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Refinement in software engineering allows a specification to be developed in stages, with design decisions taken at earlier stages constraining the design at later stages. Refinement in complex data models is difficult due to lack of a way of defining constraints, which can be progressively maintained over increasingly detailed refinements. Category theory provides a way of stating wide scale constraints. These constraints lead to a set of design guidelines, which maintain the wide scale constraints under increasing detail. Previous methods of refinement are essentially local, and the proposed method does not interfere very much with these local methods. The result is particularly applicable to semantic web applications, where ontologies provide systems of more or less abstract constraints on systems, which must be implemented and therefore refined by participating systems. With the approach of this paper, the concept of committing to an ontology carries much more force. (c) 2005 Elsevier B.V. All rights reserved.
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High-quality data about protein structures and their gene sequences are essential to the understanding of the relationship between protein folding and protein coding sequences. Firstly we constructed the EcoPDB database, which is a high-quality database of Escherichia coli genes and their corresponding PDB structures. Based on EcoPDB, we presented a novel approach based on information theory to investigate the correlation between cysteine synonymous codon usages and local amino acids flanking cysteines, the correlation between cysteine synonymous codon usages and synonymous codon usages of local amino acids flanking cysteines, as well as the correlation between cysteine synonymous codon usages and the disulfide bonding states of cysteines in the E. coli genome. The results indicate that the nearest neighboring residues and their synonymous codons of the C-terminus have the greatest influence on the usages of the synonymous codons of cysteines and the usage of the synonymous codons has a specific correlation with the disulfide bond formation of cysteines in proteins. The correlations may result from the regulation mechanism of protein structures at gene sequence level and reflect the biological function restriction that cysteines pair to form disulfide bonds. The results may also be helpful in identifying residues that are important for synonymous codon selection of cysteines to introduce disulfide bridges in protein engineering and molecular biology. The approach presented in this paper can also be utilized as a complementary computational method and be applicable to analyse the synonymous codon usages in other model organisms. (c) 2005 Elsevier Ltd. All rights reserved.
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The applicability of linear peptides as drugs is potentially limited by their susceptibility to proteolytic cleavage and poor bioavailability. Cyclotides are macrocyclic cystine-knotted mini-proteins that have a broad range of bioactivities and are exceptionally stable, being resistant to chemical, thermal and enzymatic degradation. The general limitations of peptides as drugs can potentially be overcome by using the cyclotide framework as a scaffold onto which new activities may be engineered. The potential use of cyclotides and related peptide scaffolds for drug design is evaluated herein, with reference to increasing knowledge of the structures and sequence diversity of natural cyclotides and the emergence of new approaches in protein engineering.
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Chemical engineering education is challenged around the world by demands and rapid changes encompassing a wide range of technical and social drivers. Graduates must be prepared for practice in increasingly diverse workplace environments in which generic or transferable attributes such as communication and teamwork together with technical excellence are mandated by prospective employers and society at large. If academe is to successfully deliver on these graduate attributes, effective curriculum design needs to include appropriate educational processes as well as course content. Conventional teacher centred approaches, stand-alone courses and retro-fitted remedial modules have not delivered the desired outcomes. Development of the broader spectrum of attributes is more likely when students are engaged with realistic and relevant experiences that demand the integration and practice of these attributes in contexts that the students find meaningful. This paper describes and evaluates The University of Queensland's Project Centred Curriculum in Chemical Engineering (PCC), a programme-wide approach to meeting these requirements. PCC strategically integrates project-based learning with more traditional instruction. Data collected shows improved levels of student attainment of generic skills with institutional and nationally benchmarked indicators showing significant increases in student perceptions of teaching quality, and overall satisfaction with the undergraduate experience. Endorsements from Australian academic, professional and industry bodies also support the approach as more effectively aligning engineering education with professional practice requirements.
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Grevillea 'Crimson Yul-lo' inflorescences have cut flower potential, but their vase life is short. End of vase life is characterized by early wilting. The possibility of physiologically mediated stem end blockage was investigated. Hydraulic conductance of 2 cm long stem end segments declined rapidly and remained lower throughout vase life than that of 2 cm long stem segments from immediately above. Recutting daily to remove basal 2 cm stem ends increased solution uptake, delayed declines in inflorescence water potential and water content, and improved inflorescence vase life. S-carvone is a potential inhibitor of wound related suberin formation, via inhibition of phenylalanine ammonia-lyase. Vase solution treatments with S-carvone (0.318 and 0.636 mM) delayed the decline in hydraulic conductance of basal 2 cm long stem end segments and decreases in vase solution uptake and relative fresh weight of cut stems, and extended vase life. Treatments with the catechol oxidase inhibitor 4-hexylresorcinol (2.5-10 mM) also delayed stem end blockage. These findings suggest that stem end blockage in cut G. 'Crimson Yul-lo' stems is physiologically mediated. (C) 2006 Elsevier B.V. All rights reserved.
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Established in 1986, ASWEC is the premier technical meeting for the Australian Software Engineering Community, and attracts a significant number of international participants. The conference is sponsored by both Engineers Australia and the Australian Computer Society. The major goal of the conference is to provide a forum for exchanging experience and new research results in software engineering. The technical program for ASWEC 2004 includes research papers from Australia and across the world. This year we received 79 submissions from 12 countries: 56 from Australia, 6 from New Zealand, 9 from Asia, 4 from Europe, and 4 from North America. All papers were fully refereed by three (two papers by only two) Program Committee members. We accepted 36 papers to be presented at the conference. We are grateful to all authors who contributed to ASWEC 2004. In addition to the technical papers, the conference program also includes two keynote speakers and one panel on Software Engineering accreditation. We are very pleased about being able to attract Philippe Kruchten, University of British Columbia, and Ian Hayes, The University of Queensland, as the keynote speakers for this conference.
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Established in 1986, ASWEC is the premier technical meeting for the Australian software engineering community, and attracts a significant number of international participants. The major goal of the conference is to provide a forum for exchanging experience and new research results in software engineering. To increase the industry participation at ASWEC, we organized two separate paper tracks, which we have called Research Papers and Industry Experience Reports. These paper tracks had separate deadlines, separate program committees, separate review procedures, and separate proceedings. The Research Papers appear in these proceedings and the Industry Experience Reports will appear on a CD-Rom that will be distributed at the conference. The Research Papers track for ASWEC 2005 includes submissions from Australia and across the world. This year we received 79 submissions from 13 countries: 48 from Australia, 7 from New Zealand, 11 from Asia, 9 from Europe, and 2 each from North and South America. All papers were fully refereed by three Program Committee members. We accepted 34 papers to be presented at the conference. We are grateful to all authors who contributed to ASWEC.
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Service-based systems that are dynamically composed at run time to provide complex, adaptive functionality are currently one of the main development paradigms in software engineering. However, the Quality of Service (QoS) delivered by these systems remains an important concern, and needs to be managed in an equally adaptive and predictable way. To address this need, we introduce a novel, tool-supported framework for the development of adaptive service-based systems called QoSMOS (QoS Management and Optimisation of Service-based systems). QoSMOS can be used to develop service-based systems that achieve their QoS requirements through dynamically adapting to changes in the system state, environment and workload. QoSMOS service-based systems translate high-level QoS requirements specified by their administrators into probabilistic temporal logic formulae, which are then formally and automatically analysed to identify and enforce optimal system configurations. The QoSMOS self-adaptation mechanism can handle reliability- and performance-related QoS requirements, and can be integrated into newly developed solutions or legacy systems. The effectiveness and scalability of the approach are validated using simulations and a set of experiments based on an implementation of an adaptive service-based system for remote medical assistance.