Bibliografie tematiche / Matrix interfaces

Letteratura scientifica selezionata sul tema "Matrix interfaces"

Autore: Grafiati

Pubblicato: 1 giugno 2024

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Articoli di riviste sul tema "Matrix interfaces":

Zhao, J. L., e H. F. Qiang. "Numerical Scheme for Micro-Damage Mechanism of Composite Propellant". Key Engineering Materials 417-418 (ottobre 2009): 265–68. http://dx.doi.org/10.4028/www.scientific.net/kem.417-418.265.

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HTPB propellant is the high filled particulate elastomeric matrix composite. Debonding of particle/matrix interfaces can significantly affect the macroscopic behavior of composite propellant. How to model the propellant material and describe damage processes to discover damage mechanism has been a long-standing question. This paper used the bilinear cohesive law with different parameter values for particle/matrix interfaces to study interface debonding. By analyzing the damage evolution in two model particulate composite systems with finite element method, the scheme was shown to capture effects associated with the interface strength and the interactions between particles.

Gupta, Vijay. "An Evaluation of the Interface Tensile Strength–Toughness Relationship". MRS Bulletin 16, n. 4 (aprile 1991): 39–45. http://dx.doi.org/10.1557/s0883769400057092.

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Mechanical properties of interfaces between dissimilar or similar materials (e.g., grain boundaries) have become the focal point of research in several fields, including composite materials (metal, ceramic and intermetallic matrix composites), tribology, and solid state devices. This is not surprising because the interfaces between dissimilar materials are sites for mechanical stress concentrations and often nucleate the overall failure process.Interfaces of interest in composite materials exist between fibers and their diffusion barrier coatings or between the fibers and the surrounding matrix material. In the field of tribology, interfaces exist between various types of functional (magnetic, conducting, optical, electrical), protective (thermal barrier, corrosion, wear resistant), or decorative coatings and their underlying substrates. And, finally, metal/ceramic interfaces are of interest in multilayer devices and magnetic disks and head technology. In all the above applications, mechanical properties of the interface (tensile and shear strength, toughness, etc.) often control the overall functionality of the coated part. Therefore, improving the mechanical properties of the interface for a prolonged life of the coated part is of fundamental interest. However, in ceramic and metal matrix composites, where the fiber/coating interface is used to deflect impinging cracks from the matrix, it is often desirable to impair the strength of the interface.

JIANG, LIYING, HONGLAI TAN, JIAN WU, YONGGANG HUANG e KEH-CHIH HWANG. "CONTINUUM MODELING OF INTERFACES IN POLYMER MATRIX COMPOSITES REINFORCED BY CARBON NANOTUBES". Nano 02, n. 03 (giugno 2007): 139–48. http://dx.doi.org/10.1142/s1793292007000519.

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The interface behavior may significantly influence the mechanical properties of carbon nanotube (CNT)-reinforced composites due to the large interface area per unit volume at the composite. The modeling of CNT/polymer interfaces has been a challenge in the continuum modeling of CNT-reinforced composites. This paper presents a review of recent progress to model the CNT/matrix interfaces via a cohesive law established from the van der Waals force. A simple, analytical cohesive law is obtained from the inter-atomic potential, and is used to study the effect of CNT/matrix interfaces on the macroscopic properties of CNT-reinforced composites.

Cornie, James A. "Designing Interfaces". MRS Bulletin 16, n. 4 (aprile 1991): 27–30. http://dx.doi.org/10.1557/s0883769400057079.

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During the 20 years I have been working in the field of metal matrix composites, I have always been drawn to the study of interfaces. Any problems the materials researcher or developer encounters will eventually be tied to some issue involving the interface. The interface controls the in-situ fiber strength and hence the axial strength of the composite. The transverse strength of composites is also controlled directly by the strength of the interface. It follows that in order to optimize a fiber/matrix reinforcement system, one must also optimize the interface. It is no accident, then, that so soon after the two excellent issues on interfaces edited by D. Wolf and S. Yip (MRS Bulletin, September and October 1990), we launch into the subject again. This time, we approach the interface from the point of view of integrating the fields of materials science and engineering, i.e., integrating the structure-processing-properties-materialssynthesis relationships.The concept of interface design is relatively new. Until recently, we simply controlled damage and limited fiber degradation by controlling processing variables, and contented ourselves with what nature allowed. For the most demanding applications, nature was not permitting reliable structures.Our emphasis in this issue of the MRS Bulletin is the development of the skills and strategies to design interfaces to a specifie application. In the future, we will be asking materials to perform structurally at temperatures approaching 3000°C in some propulsion applications. The success of such applications will depend on how well we design the interfaces.

Qu, Hong Chang, Xiao Zhou Xia, Hong Yuan Li e Zhi Qiang Xiong. "Mechanical Analysis of Unidirectional Fiber-Reinforced Polymers under Transverse Compression and Tension". Advanced Materials Research 139-141 (ottobre 2010): 84–89. http://dx.doi.org/10.4028/www.scientific.net/amr.139-141.84.

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The mechanical behavior of polymer–matrix composites uniaxially reinforced with carbon or glass fibers subjected to compression/tension perpendicular to the fibers was studied using computational micromechanics. This is carried out using the finite element simulation of a representative volume element of the microstructure idealized as a random dispersion of parallel fibers embedded in the polymeric matrix. Two different interface strength values were chosen to explore the limiting cases of composites with strong or weak interfaces, and the actual failure mechanisms (plastic deformation of the matrix and interface decohesion) are included in the simulations through the corresponding constitutive models. Composites with either perfect or weak fiber/matrix interfaces (the latter introduced through cohesive elements) were studied to assess the influence of interface strength on the composite behavior. It was found that the composite properties under transverse compression/tension were mainly controlled by interface strength and the matrix yield strength in uniaxial compression/tension.

Wang, Liqun, e Liwei Shi. "A Numerical Method for Solving Matrix Coefficient Heat Equations with Interfaces". Numerical Mathematics: Theory, Methods and Applications 8, n. 4 (novembre 2015): 475–95. http://dx.doi.org/10.4208/nmtma.2015.m1331.

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AbstractIn this paper, we propose a numerical method for solving the heat equations with interfaces. This method uses the non-traditional finite element method together with finite difference method to get solutions with second-order accuracy. It is capable of dealing with matrix coefficient involving time, and the interfaces under consideration are sharp-edged interfaces instead of smooth interfaces. Modified Euler Method is employed to ensure the accuracy in time. More than 1.5th order accuracy is observed for solution with singularity (second derivative blows up) on the sharp-edged interface corner. Extensive numerical experiments illustrate the feasibility of the method.

Evans, A. G. "Interfacial phenomena in the fracture resistance of interfaces". Proceedings, annual meeting, Electron Microscopy Society of America 46 (1988): 720–21. http://dx.doi.org/10.1017/s0424820100105667.

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In composite systems, the mechanical response of interfaces to the approach of cracks that initially form either in the matrix or in the fiber dominates the mechanical performance. In particular, in brittle matrix composites, the interface must have a sufficiently low fracture resistance compared with that of both the fiber and matrix that the crack diverts into the interface and debonds the fiber, Thereafter, the debonded fiber must be able to slide against the matrix with a low friction stress in order to inhibit fiber failure and thus enhance pull-out. These processes are schematically illustrated in Fig. 1. Mechanics investigations have established requirements concerning debonding and sliding that must be satisfied in order to achieve good composite properties. At the simplest level, these studies reveal that the fracture energy of the interface should be less than about one-third that of either the fiber or the matrix.

Siao, Fu-Cih, e Yu-Cheng Lin. "ENHANCING CONSTRUCTION INTERFACE MANAGEMENT USING MULTILEVEL INTERFACE MATRIX APPROACH / RYŠIŲ VADYBOS STATYBOJE GERINIMAS TAIKANT ĮVAIRIALYGIŲ RYŠIŲ MATRICOS METODĄ". Journal of Civil Engineering and Management 18, n. 1 (8 febbraio 2012): 133–44. http://dx.doi.org/10.3846/13923730.2012.657368.

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Many interfaces typically exist in the construction phase of a project. Since project participants usually fail to share interface information, most interfaces are difficult to solve effectively during that phase. Furthermore, future activities might not be implemented based on changes made by predecessors. In practice, failure to manage interfaces may result in additional work or in low project performance. In order to manage construction interfaces effectively, this study proposes the novel Multilevel Interface (MI) Matrix approach to enhance interface management during the construction phase of construction projects. By using the MI matrix approach, construction interface issues will be tracked and man-aged easily and effectively. Furthermore, this study develops a construction web matrix-based interface management (WMIM) system integrated with the proposed MI Matrix approach. The MI matrix approach and WMIM system are applied to a pilot test to illustrate how to support interface management during the construction project. As results of the pilot test indicate, the MI matrix approach and WMIM system provide an effective interface management tool for the construction phase. Santrauka Statybos projekto statybos darbų etapui būdinga tai, kad su įvairiais subjektais palaikoma gausybė ryšių. Daugumą jų šiame etape veiksmingai palaikyti dažniausiai ne itin lengva, nes projekto dalyviai paprastai informacija apie juos nesidalija. Be to, perimantys darbą gali ir nesiremti savo pirmtakų padarytais pakeitimais. Praktine prasme nesugebant valdyti ryšių, gali tekti darbus perdaryti arba projekto efektyvumas gali sumažėti. Efektyviam su statyba susijusių ryšių valdymui šiame darbe siūlomas novatoriškas įvairialygių ryšių (ĮR) matricos metodas, leidžiantis pagerinti ryšių valdymą statybos projekto statybos darbų etape. Taikant ĮR matricos metodą lengva veiksmingai sekti ir valdyti statybų ryšių klausimus. Be to, atliekant tyrimą sukuriama projekto dalyviams skirta internetinė matricinė statybų ryšių valdymo (WMIM) sistema, į kurią įtrauktas siūlomas ĮR matricos metodas. Taip pat, taikant ĮR matricos metodą ir WMIM sistemą, atliekamas bandymas, rodantis, kaip jie padeda valdyti statybos projekto ryšius. Bandymo rezultatai rodo, kad ĮR matricos metodas ir WMIM sistema – tai efektyvi ryšių valdymo priemonė statybos darbų etape.

Chawla, K. K. "Interfaces in metal matrix composites". Composite Interfaces 4, n. 5 (gennaio 1996): 287–98. http://dx.doi.org/10.1163/156855497x00046.

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Lamon, Jacques, e Stephane Pompidou. "Micromechanics-Based Evaluation of Interfaces in Ceramic Matrix Composites". Advances in Science and Technology 50 (ottobre 2006): 37–45. http://dx.doi.org/10.4028/www.scientific.net/ast.50.37.

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Interfaces are a key element in ceramic matrix composites, but also in several material assemblies, such as, for instance, multilayers. This is not only because they can cause crack deflection and make materials damage tolerant, but also because they can be tailored with regard to material performances. An approach to crack deflection at interfaces or within interphases is proposed on the basis of the following Cook and Gordon’s mechanism: a crack is nucleated along an interface, ahead of a propagating crack; deflection of this crack then results from coalescence with the interface crack. The stress state induced by a crack was computed in a cell of bimaterial using the finite element method. The cell represents a matrix and a fiber, or an interphase and a fiber or two layers in a multilayer. A master curve was established. It represents the debonding condition based on strengths and elastic moduli of constituents. Then a deviation potential was defined. Deviation potentials were calculated for various fibre/matrix or layer combinations.

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Tesi sul tema "Matrix interfaces":

Shyr, Tien-Wei. "Studies of fibre-matrix interfaces". Thesis, University of Leeds, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329201.

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Gregory, Jeremy R. (Jeremy Ryan) 1976. "The role of precipitates on fiber/matrix interfaces in metal matrix composites". Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/89301.

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Blaese, Diego. "Processing and characterization of monoclinic-zirconia fibre-matrix interfaces in dense matrix alumina-alumina composites". reponame:Repositório Institucional da UFSC, 2013. https://repositorio.ufsc.br/handle/123456789/107283.

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Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Mecânica, Florianópolis, 2013.
Made available in DSpace on 2013-12-05T23:42:12Z (GMT). No. of bitstreams: 1 318449.pdf: 2754019 bytes, checksum: d73daae4512a7cb151813f0d7e905cae (MD5) Previous issue date: 2013
Interfaces fibra-matriz tem um papel muito importante no desempenho de compósitos de matriz cerâmica. Sendo a interação entre fibra e matriz for muito forte, o compósito se comportará como uma cerâmica monolítica, e sendo muito fraca, o compósito perderá sua integridade estrutural e suas propriedades interlaminares. Zircônia monoclínica (não-estabilizada) tem mostrado ser uma boa alternativa na produção de interfaces fibra-matriz para compósitos cerâmicos à base de alumina devido à sua baixa interação química durante a sinterização e também devido ao fenômeno de microtrincamento causado pela transformação tetragonal-monoclínica durante o resfriamento. Interfaces porosas à base de zircônia monoclínica, as quais apresentam baixa tenacidade devido à sua porosidade e microtrincamento, haviam sido usadas no passado para criar interfaces com baixa interação entre fibras de safira e matrizes de alumina. Neste sistema, as interfaces se mostraram quimicamente estáveis mesmo acima de 1300 °C. Compósitos tenazes à base de alumina haviam sido fabricados com zircônia monoclínica como interface. Entretanto, a porosidade da matriz era ? 13%, o que dificulta a interpretação dos resultados, pois as propriedades mecânicas do compósito não podem ser claramente atribuídas às propriedades da zircônia monoclínica. Neste trabalho, compósitos-modelo com matriz densa e fibras individuais de alumina foram produzidos. A interface fibra-matriz foi produzida através de recobrimento por dip-coating das fibras em suspensões cerâmicas de zircônia monoclínica. Diferentes tamanhos de partícula foram utilizados no processo de dip-coating com o objetivo de variar a porosidade e assim, as propriedades das interfaces. A tensão de cisalhamento interfacial foi determinada através do teste de pushin nas fibras. O fenômeno de deflexão de trincas foi avaliado através de trincas criadas por indentação Vickers e o fenômeno de pullout das fibras através de observações nas superfícies de fratura. Propriedades como tenacidade à fratura, dureza e módulo de elasticidade da matriz e interface foram avaliadas para determinar os parâmetros de deflexão de trincas propostos por He e Hutchinson.

Abstract : Fibre-matrix interface properties play an important role on the performance of ceramic matrix composites. Being the fibre-matrix interaction too strong, the composite will behave such as a monolithic ceramic and being too weak, the composite will lose its structural integrity and its interlaminar properties. Monoclinic (unstabilized) zirconia has shown to be a suitable alternative for the production of fibre-matrix interfaces for alumina ceramic matrix composites due to its low chemical interaction during sintering and due to the microcracking phenomenon caused by the tetragonal-monoclinic transformation during cooling. Porous oxide coatings of monoclinic zirconia, which have low toughness because of their porosity and microcracking, have been used in the past to achieve debonding between sapphire fibres and alumina matrices and were to be chemically stable with sapphire above 1300 °C. Tough alumina matrix composites have been fabricated using monoclinic zirconia as fibres coating. However the matrix porosity was = 13%, which makes it difficult to interpret the results, because the toughness cannot be unambiguously attributed to the properties of the unstabilized zirconia interfaces. In this work, model composites with dense alumina matrix and single alumina fibres were fabricated. The fibre-matrix interface was produced via dip-coating single fibres in monoclinic zirconia suspensions. Different particle sizes were used for the dip-coating in order to vary the coating porosity. The interfacial sliding stress was determined via a modified fibre pushin test. The crack deflection behaviour was analysed from cracks created via Vickers indentations and the fibre pullout via surface fracture observations. Properties such as fracture toughness, hardness and elastic modulus for the interface and matrix were also evaluated in order to determine the crack deflection parameters established by He and Hutchinson.

Robinette, Eric Jason Palmese Giuseppe R. "Toughening vinyl ester matrix composites by tailoring nanoscale and mesoscale interfaces /". Philadelphia, Pa. : Drexel University, 2005. http://hdl.handle.net/1860/1125.

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Zeiger, Adam Scott. "Chemomechanics at cell-cell and cell-matrix interfaces critical to angiogenesis". Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/88378.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Materials Science and Engineering, February 2014.
Cataloged from PDF version of thesis. "February 2014."
Includes bibliographical references.
The ability to characterize and control cellular responses in vitro has far reaching implications for basic science and applied medical research. For well over 125 years, researchers have studied the behavior of biological cells under in vitro conditions where rigid glass or plastic Petri dishes and defined media in the laboratory replace the compliant solids and crowded fluids of the human body in vivo. While these tools have enabled several important advances in understanding cell functions and pathological mechanisms, the behavior of tissue cells in vitro can differ remarkably from those observed in in vivo tissue microenvironments. It is becoming increasingly appreciated that there is a close coupling between the chemical and mechanical microenvironments of the cell (i.e., the chemomechanical niche). Therefore, the biochemical reactions and conditions responsible for generating mechanical stresses and attendant cell behaviors may not be well represented in typical in vitro assays. In several key respects, particularly in terms of cell proliferation, adhesion, migration and phenotypic metabolism, in vitro assays often misrepresent the major characteristics of these behaviors in vivo. Most physiological processes are defined in part by mechanical force, mechanical microenvironment, and chemical stimuli (e.g., in angiogenesis or regulation of stern cell differentation), and therefore require an updated methodology to studying cellular mechanics and behavior. This thesis aims to address the molecular- to cellular-level chemical and mechanical environments that modulate cell function in vivo at the cell-cell and cell-matrix interfaces, while aiming to more accurately reproduce these cell responses in vitro. The experiments and analyses described in this work investigate two key questions at the heart of angiogenesis. First, how does the protein dense nature of tissue nicroenvironments affect extracellular matrix organization and, in turn, direct cell-matrix guided functions and cytoskeletal organization? This will be addressed by the addition of inert crowders which artificially enhance the effective concentration of relevant macromolecules and proteins in vitro. Second, how do the mechanically couplings and biochemical signals between adjacent, dissimilar cell types in the microvasculature coordinate and guide angiogenesis? Multiple types of deformable substrata will be used to investigate the mechanical strain and soluble growth factors generated by perivascular cells and the response of microvascular endothelial cells to those cues. This includes the development of a novel uniaxial strain-generating device and tissue culture surfaces for endothelial cells. Atomic force microscopy enabled imaging and nanoindentation, mechanically and chemically defined substrata, immunocyto-chemistry, and novel quanitification and analysis techniques are used concomitantly to answer these questions. Ultimately, this thesis aims to close the gap between in vitro cell culture and in vivo cell physiology, especially in directing and characterizing chemomechanical cues implicated in angiogenesis, and to inform the design of future experiments and microenvironments with non-dilute culture media and deformable substrata.
by Adam Scott Zeiger.
Ph. D.

Benethuilière, Thibaut. "Phénomènes physico-chimiques aux interfaces fibre/matrice dans des composites SMC structuraux : Du mouillage à l'adhésion". Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEI151.

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Shu, Shu. "Engineering the performance of mixed matrix membranes for gas separations". Diss., Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/26626.

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Thesis (Ph.D)--Chemical Engineering, Georgia Institute of Technology, 2008.
Committee Chair: Koros William; Committee Member: Hess Dennis; Committee Member: Jones Christopher; Committee Member: Meredith Carson; Committee Member: Wong CP. Part of the SMARTech Electronic Thesis and Dissertation Collection.

Di, Ciò Stefania. "How cells sense the matrix geometry : a novel nanopatterning approach". Thesis, Queen Mary, University of London, 2017. http://qmro.qmul.ac.uk/xmlui/handle/123456789/31789.

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Tissue engineering and regenerative medicine aim to develop materials that mimic some of the characteristics of the tissue they are replacing and control the growth and proliferation of cells. Despite exceptional advances in the range and quality of materials used, much remains to discover about the processes regulating interfaces between cells and their surroundings, or at cell-material interfaces. In order to study and control such interactions, scientists have produced engineered matrices aiming to mimic some of the feature of natural extra-cellular matrix (biochemistry, geometry/topography and mechanical properties). In order to pattern 2D-nanofibers on relatively large areas and throughput, allowing comprehensive biological studies, we developed a nano-fabrication technique based on the deposition of sparse mats of electrospun fibres with different diameters. These mats are used as masks to grow cell resistant polymer brushes from exposed areas. After removal of the fibres, the remaining brushes define a quasi-2D fibrous pattern onto which ECM molecules such as fibronectin can be adsorbed. Chapter 2 includes details of the techniques used to produce and characterize the fibrous nanopattern. Chapter 3 is focused on cell phenotype observed on the different nanofibres sizes. Adhesion assays showed that cell spreading, shape and polarity are regulated by the size of fibres but also the density of the nanofibres, similarly to previous observations made on circular nanopatterns. We then focused on the study of focal adhesion formation and maturations on these nanofibres and the role of key proteins involved in the regulation of the adhesion plaque: integrins and vinculin. Cells expressing different integrins were found to sense the nanoscale geometry differently. Vinculin sensing is the topic of Chapter 4. Although vinculin recruitment dynamics was affected by the nanofibrous patterns and focal adhesions arrange differently on the nanofibres, this protein does not seem to mediate nanoscale sensing. In Chapter 5, we finally focused on the role of the actin cytoskeleton as a direct sensor of nanoscale geometry. A gradual decrease in stress fibre formation was observed as the nanofibres dimensions decrease. Live imaging also demonstrated that the geometry of the extracellular environment strongly affects cytoskeleton rearrangement, stress fibres formation and disassembly. We identify the role of cytoskeleton contractility as an important sensor of the nanoscale geometry. Our study provides a deeper insight in understanding cell adhesion to the extracellular environment and the role of the matrix geometry and topography on such phenomena, but also raises questions regarding the more detailed molecular sensory elements enabling the direct sensing of nanoscale geometry through the actin cytoskeleton.

Duarte, Carlos. "Design and Evaluation of Adaptative Multimodal Systems". Doctoral thesis, Department of Informatics, University of Lisbon, 2008. http://hdl.handle.net/10451/14293.

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This thesis focuses on the design and evaluation of adaptive multimodal systems. The design of such systems is approached from an integrated perspective, with the goal of obtaining a solution where aspects related to both adaptive and multimodal systems are considered. The result is FAME, a model based framework for the design and development of adaptive multimodal systems, where adaptive capabilities impact directly over the process of multimodal fusion and fission operations. FAME overviews the design of systems capable of adapting to a diversified context, including variations in users, execution platform, and environment. FAME represents an evolution from previous frameworks by incorporating aspects specific to multimodal interfaces directly in the development of an adaptive platform. One of FAME's components is the Behavioral Matrix, a multipurpose instrument, used during the design phase to represent the adaptation rules. In addition, the Behavioral Matrix is also the component responsible for bridging the gap between design and evaluation stages. Departing from an analogy between transition networks for representing interaction with a system, and behavioral spaces, the Behavioral Matrix makes possible the application of behavioral complexity metrics to general adaptive systems. Moreover, this evaluation is possible during the design stages, which translates into a reduction of the resources required for evaluation of adaptive systems. The Behavioral Matrix allows a designer to emulate the behavior of a non-adaptive version of the adaptive system, allowing for comparison of the versions, one of the most used approaches to adaptive systems evaluation. In addition, the designer may also emulate the behavior of different user profiles and compare their complexity measures. The feasibility of FAME was demonstrated with the development of an adaptive multimodal Digital Book Player. The process was successful, as demonstrated by usability evaluations. Besides these evaluations, behavioral complexity metrics, computed in accordance with the proposed methodology, were able to discern between adaptive and non-adaptive versions of the player. When applied to user profiles of different perceived complexity, the metrics were also able to detect the different interaction complexity

Barros, Fábio Monteiro de. "Species composition, ecological functions and ecosystem services by birds across forest-matrix interfaces in tropical disturbed landscapes /". Rio Claro, 2017. http://hdl.handle.net/11449/152541.

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Orientador: Milton Cezar Ribeiro
Banca: Danilo Boscolo
Banca: Victor Satoru Saito
Banca: Karl Stephan Mokross
Banca: Erica Hasui
Resumo: A perda e fragmentação dos habitats tem levado a crescentes perdas de biodiversidade e serviços ecossistêmicos em todo mundo. Em paisagens antropogênicas, diversos fatores são conhecidos por moldarem essa biodiversidade e serviços ecológicos, entre elas a quantidade de cobertura florestal e o tipo e composição da matriz antrópicas. Usando aves como objeto de estudo, nesta tese nós basicamente buscamos quantificar a composição, função e serviços ecossistêmicos de espécies de aves que ocorrem em dois tipos de interfaces de habitat mais comum ao longo da Mata Atlântica brasileira (floresta-pasto e floresta-eucalipto), e tentamos entender melhor como as características da paisagem ajudam a moldar os padrões encontrados. No capítulo 1, nossos dados sugeriram que pastagens são capazes de prover maior potencial de prover serviços de dispersão de sementes, controle de pragas e polinização por aves do que plantações de eucalipto, no entanto algumas particularidade e limitações de interpretação desses resultados são apontadas e discutidas. No mesmo capítulo também elucidamos a importância das espécies generalistas na provisão de serviços de dispersão de sementes, assim como a presença das áreas habitadas por pessoas dentro de propriedades rurais como potencial facilitador desse serviço pelas aves em paisagens alteradas. No segundo capítulo, verificamos que o tipo de matriz adjacente (pasto ou eucalipto) interfere na composição taxonômica e funcional das comunidades de aves que habitam ... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: Habitat loss and fragmentation have led to increasing biodiversity and ecosystem loss worldwide. In anthropogenic landscapes, several factors are kn own to modulate biodiversity and ecosystem services, mainly the amount of forest cover and matrix type and composition. Using birds as study object, in this thesis we basically aimed to quantif y composition, function and ecosystem services by birds occurri ng in two types of most common habitat interfaces across Atlantic forest in Brazil (forest - pastures and forest - eucalyptus), and tried to better understand how landscapes attributes help to drive the patterns found. In the chapter 1, we demonstrated that pa stures stands are able to provide higher potential provision of seed dispersal, pest control and pollination services by birds, however some limitation and particularities on these results are pointed and discussed. In the same chapter, we also highlighted the importance of habitat generalist birds as potential providers of ecosystem services as well as the presence of rural homesteads as likely seed dispersal facilitator in highly disturbed landscapes. In the second chapter, we verified that type of adjace nt matrix alters taxonomic and functional composition of bird communities inhabiting forest edges, and that an increase of forest cover may lead to a decrease in functional dissimilarities between bird communities within the both types of habitat interface s (forest - pasture and forest - eucalyptus). Lastly, in the f... (Complete abstract click electronic access below)
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Più fonti

Libri sul tema "Matrix interfaces":

International Conference on Composite Interfaces (2nd 1988 Cleveland, Ohio). Interfaces in polymer, ceramic and metal matrix composites. A cura di Ishida Hatsuo. London: Elsevier, 1988.

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1938-, Dhingra Ashok K., Fishman Steven G, Metallurgical Society-American Society of Metals Composite Committee. e Metallurgical Society of AIME. Meeting, a cura di. Interfaces in metal-matrix composites: Proceedings of a symposium. Warrendale, PA: Metallurgical Society, 1986.

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S, Jacobson Nathan, e United States. National Aeronautics and Space Administration., a cura di. Chemical status of the fiber coating/matrix interface in silicon-based ceramic matrix composites. Washington, DC: National Aeronautics and Space Administration, 1995.

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L, Walter John, King Alexander H. 1954-, Tangri Kris e ASM International, a cura di. Structure & property relationships for interfaces. [Materials Park, Ohio]: ASM International, 1991.

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Naik, Rajiv A. Fracture mechanics analysis for various fiber/matrix interface loadings. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1991.

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Li, Yinghai. EDS in TEM: (1) artefacts (2) application to SiC and ceramic matrix interfaces. Birmingham: University of Birmingham, 1993.

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Murthy, Pappu L. N. Probabilistic micromechanics and macromechanics for ceramic matrix composites. [Washington, D.C.]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1997.

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A, Bahei-El-Din Y., Mirdamadi M e Langley Research Center, a cura di. Time-dependent deformation of titanium metal matrix composites. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1995.

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M, Arnold Steven, e United States. National Aeronautics and Space Administration., a cura di. Critique of macro flow/damage surface representations for metal matrix composites using micromechanics. [Washington, D.C: National Aeronautics and Space Administration, 1996.

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Più fonti

Capitoli di libri sul tema "Matrix interfaces":

Ochs, Markus, Susana Carregal-Romero, Joanna Rejman, Kevin Braeckmans, Stefaan C. De Smedt e Wolfgang J. Parak. "Light-Addressable Capsules as Caged Compound Matrix for Controlled Triggering of Cytosolic Reactions". In Bio-Nano Interfaces, 1195–208. New York: Jenny Stanford Publishing, 2024. http://dx.doi.org/10.1201/9781003306498-48.

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de Lhoneux, B., E. Baes e T. Avella. "Ultrastructural Aspects of Fibre—Matrix Bond in Cellulose Cement Composites". In Interfaces in New Materials, 129–38. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3680-8_13.

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Lamon, Jacques. "Influence of Interfaces and Interphases on the Mechanical Behavior of Fiber-Reinforced Ceramic Matrix Composites". In Ceramic Matrix Composites, 40–64. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118832998.ch3.

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Mackay, Tom G., e Akhlesh Lakhtakia. "Bianisotropic Slab with Periodically Corrugated Interfaces". In The Transfer-Matrix Method in Electromagnetics and Optics, 51–73. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-031-02022-3_4.

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Duclos, R., R. Martinez e J. Crampon. "High Temperature Deformation of Al2O3/ZrO2 Matrix Ceramic Composites: Interface Controlled Creep". In Interfaces in New Materials, 42–51. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3680-8_4.

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Werner, Carsten, Tilo Pompe e Katrin Salchert. "Modulating Extracellular Matrix at Interfaces of Polymeric Materials". In Polymers for Regenerative Medicine, 63–93. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/12_089.

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Pirouz, P., G. Morscher e J. Chung. "Importance of Interfacial Strength on Fracture Toughness of Brittle Matrix Composites". In Surfaces and Interfaces of Ceramic Materials, 737–60. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-1035-5_46.

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Swan, Håkan A., Colette O’Meara e Gordon L. Dunlop. "Interfaces in Ceramic Matrix Composites Following High Temperature Deformation". In 4th International Symposium on Ceramic Materials and Components for Engines, 284–91. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2882-7_26.

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Lamon, Jacques, e Stephane Pompidou. "Micromechanics-Based Evaluation of Interfaces in Ceramic Matrix Composites". In Advanced Inorganic Fibrous Composites V, 37–45. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/3-908158-06-0.37.

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Grabowski, Hans, e Xiaohe Li. "General matrix representation for NURBS curves and surfaces for interfaces". In Freeform Tools in CAD Systems, 219–31. Wiesbaden: Vieweg+Teubner Verlag, 1991. http://dx.doi.org/10.1007/978-3-322-86773-5_13.

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Atti di convegni sul tema "Matrix interfaces":

Arenas, Alberto Llera, Viceng Gomez e Hilbert J. Kappen. "Sparse matrix factorization for brain computer interfaces". In 2009 3rd International Conference on Affective Computing and Intelligent Interaction and Workshops (ACII 2009). IEEE, 2009. http://dx.doi.org/10.1109/acii.2009.5349481.

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Golubi�, Kruno. "Some Optimization Techniques of the Matrix Multiplication Algorithm". In 35th International Conference on INFORMATION TECHNOLOGY INTERFACES. Zagreb: University Computing Centre - SRCE, 2013. http://dx.doi.org/10.2498/iti.2013.0572.

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Lu, Yichao, Ruihai Dong e Barry Smyth. "Convolutional Matrix Factorization for Recommendation Explanation". In IUI'18: 23rd International Conference on Intelligent User Interfaces. New York, NY, USA: ACM, 2018. http://dx.doi.org/10.1145/3180308.3180343.

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Snopce, Halil, e Lavdrim Elmazi. "The importance of using the linear transformation matrix in determining the number of processing elements in 2-dimensional systolic array for the algorithm of matrix-matrix multiplication". In 2008 30th International Conference on Information Technology Interfaces (ITI). IEEE, 2008. http://dx.doi.org/10.1109/iti.2008.4588528.

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Nathan, Arokia, Jun Yu, Chen Jiang e Hanbin Ma. "TFT Interfaces for High Sensory Resolution at Ultralow Power". In 2022 29th International Workshop on Active-Matrix Flatpanel Displays and Devices (AM-FPD). IEEE, 2022. http://dx.doi.org/10.23919/am-fpd54920.2022.9851263.

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Bikulciene, Liepa, Zenonas Navickas, Alfonsas Vainoras, Jonas Poderys e Rimtautas Ruseckas. "Matrix analysis of human physiologic data". In Proceedings of the ITI 2009 31st International Conference on Information Technology Interfaces (ITI). IEEE, 2009. http://dx.doi.org/10.1109/iti.2009.5196052.

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Marinho, Leandro Balby, Júlio Barreto Guedes da Costa, Denis Parra e Rodrygo L. T. Santos. "Similarity-Based Explanations meet Matrix Factorization via Structure-Preserving Embeddings". In IUI '22: 27th International Conference on Intelligent User Interfaces. New York, NY, USA: ACM, 2022. http://dx.doi.org/10.1145/3490099.3511104.

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Cutura, Rene, Michaël Aupetit, Jean-Daniel Fekete e Michael Sedlmair. "Comparing and Exploring High-Dimensional Data with Dimensionality Reduction Algorithms and Matrix Visualizations". In AVI '20: International Conference on Advanced Visual Interfaces. New York, NY, USA: ACM, 2020. http://dx.doi.org/10.1145/3399715.3399875.

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Cinibulk, M. K., Z. D. Apostolov, E. E. Boakye, T. S. Key e D. S. King. "Constituent Development for Higher-Temperature Capable Ceramic Matrix Composites". In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-76835.

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Abstract (sommario):

This paper highlights research that is addressing the need for improved high-temperature-capable CMCs, with a focus on CMC constituents and an understanding of their processing, microstructure, and behavior in relevant service environments. The most pervasive lifetime and temperature limitations for SiC/SiC CMCs are related to oxidation, creep and stress rupture of the fibers, oxidation-induced instability of the fibermatrix interface, and instability of the matrix at temperatures > 1400°C. Consequently, we are addressing these shortcomings by developing technologies to enable higher-temperature capable SiC fiber, oxidation-resistant fiber-matrix interfaces, and improvements in processing of refractory matrices for both turbine engine and hypersonic applications.

Priyadarshi, Hemant, Daniel Nickel e Seban Jose. "Interface Risk Reduction in an Integrated SURF-SPS Scope Execution". In ASME 2021 40th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/omae2021-62925.

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Abstract The paper provides a detailed estimation of the interfaces that exist in a split SURF-SPS execution model and provides a qualitative comparison to an integrated SURF-SPS execution model. A comprehensive matrix of dependencies between SURF and SPS is presented and is categorized into engineering, procurement, construction/fabrication and installation work packages. The matrix is used to illustrate the exact scope dependencies and thus, the sources of interfaces. A hypothetical greenfield development has been assumed to develop the interface matrix and to use it for comparison of the two execution models. The comparison also reveals how interfaces are naturally eliminated in an integrated SURF-SPS execution model. In each of the workstreams (E-P-C-I), top risks have been identified and monetary liability estimates for those risks have been provided. By transfer of these risks from company to contractor, monetary liability gets transferred to the contractor, thus, resulting in significant savings for operating companies. The following tangible results are provided in the paper: a) % of interface(s) reduced in the E-P-C-I areas; b) Risk reduction in monetary terms for operators – estimated values. This paper justifies the fact that there is a significant interface scope and risk reduction for operators, if they adopt an integrated SURF-SPS execution model.

Rapporti di organizzazioni sul tema "Matrix interfaces":

Besmann, T. M., D. P. Stinton, E. R. Kupp, S. Shanmugham e P. K. Liaw. Fiber-matrix interfaces in ceramic composites. Office of Scientific and Technical Information (OSTI), dicembre 1996. http://dx.doi.org/10.2172/425298.

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Cornie, James A. Engineering Interfaces in Metal Matrix Composites (Volume 3). Fort Belvoir, VA: Defense Technical Information Center, giugno 1988. http://dx.doi.org/10.21236/ada198746.

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Fine, Morris E., e Julia R. Weertman. Tailored Interfaces for Metal-Matrix Composites-Fundamental Considerations. Fort Belvoir, VA: Defense Technical Information Center, ottobre 1990. http://dx.doi.org/10.21236/ada229143.

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Joannopoulos, J. D. Theoretical Studies of the Strengths of Matrix Second Phase Particle Interfaces. Fort Belvoir, VA: Defense Technical Information Center, giugno 1994. http://dx.doi.org/10.21236/ada280703.

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Joannopoulos, J. D. Theoretical Studies of the Strengths of Matrix/Second-Phase-Particle Interfaces. Fort Belvoir, VA: Defense Technical Information Center, maggio 1993. http://dx.doi.org/10.21236/ada264889.

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Wiezorek, Joerg M., e Michael J. Mills. Microstructural Characterization of Interfaces in SiC-Reinforced Titanium Alloy-Matrix Composites. Fort Belvoir, VA: Defense Technical Information Center, luglio 1998. http://dx.doi.org/10.21236/ada351754.

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Schilling, C. H. Effects of filament-matrix interfaces on the mechanical properties of SiC-reinforced Si sub 3 N sub 4: A Review. Office of Scientific and Technical Information (OSTI), settembre 1989. http://dx.doi.org/10.2172/5490598.

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Gruodis, Alytis, Violeta Jadzgevičienė e Gitana Čechamirienė. Automated Knowledge and Achievement Assessment System MISKANTAS-22 Based on the Neural Network Method. Publishing House - Vilnius Business College, agosto 2023. http://dx.doi.org/10.57005/ab.2023.1.6.

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Abstract (sommario):

Knowledge and achievement evaluation system MISKANTAS-22 based on density matrix and neural network methods were designed as an advisor to the lecturer for automated evaluation of open-type questions. New type of plugin for Moodle system Essay Plus was created, tested, and evaluated for grading purposes. New type of user-friendly interfaces for lecturer and for student in Moodle system was realized. New concept of test of Essay Plus type was created, tested, and realized. System allows to evaluate the student's answers in real time regime.

Kovar, Robert F., e Richard W. Lusignea. Interface Modified Glass Fiber/Thermoplastic Matrix Composites. Fort Belvoir, VA: Defense Technical Information Center, marzo 1989. http://dx.doi.org/10.21236/ada207308.

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Lowden, R. A. Characterization and control of the fiber-matrix interface in ceramic matrix composites. Office of Scientific and Technical Information (OSTI), marzo 1989. http://dx.doi.org/10.2172/6855809.

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