Author: B. A. MeylanPublisher:
ISBN:
Category : Nature
Languages : en
Pages : 88
Book Description
Three-dimensional Structure of Wood
Author: B. A. MeylanThree-dimensional structure of wood
Author: B. ButterfieldPublisher: Springer Science & Business Media
ISBN: 9401181462
Category : Science
Languages : en
Pages : 103
Book Description
Nine years ago saw the publication of the first version of Three-dimensional Structure of Wood: A scanning electron microscope study [95]. This book contained 59 scanning electron micrographs and a modest text outlining the basic structure of wood_ When we wrote it in 1970, the scanning electron microscope was still something of a novelty (the first commercially produced SEM only coming on the market in 1965) and its use as an instrument in serious wood research was still treated by many with a good deal of suspicion. Such suspicions were not without foundation for indeed the first Three-dimensional Structure of Wood was put together from a somewhat paltry collection of a few hundred scanning electron micrographs of wood taken over a two year period. The last decade has seen some remarkable developments in the general understanding of the structure of wood. Our personal collection of scanning electron micrographs has grown from a few hundred to some 16 000. Techniques for specimen preparation [46, 47], particularly in the areas of dehydration [36] and coating have greatly improved. Most significant however, has been the new depth of understanding of wood ultrastructure that has become almost universal. By combining the use of the light, transmission and scanning electron microscopes, scientists in many widely separated parts of the world have now added a vast amount of information to our understanding of such aspects of wood structure as perforation plate development, tylose formation, the formation of reaction wood, septate fibres ultrastructure, etc.
Three-Dimensional Structure of Wood
Author: B. G. ButterfieldPublisher:
ISBN:
Category : Trees
Languages : en
Pages : 0
Book Description
Three-dimensional structure of wood
Author: B. ButterfieldPublisher: Springer
ISBN: 9789401181471
Category : Science
Languages : en
Pages : 103
Book Description
Nine years ago saw the publication of the first version of Three-dimensional Structure of Wood: A scanning electron microscope study [95]. This book contained 59 scanning electron micrographs and a modest text outlining the basic structure of wood_ When we wrote it in 1970, the scanning electron microscope was still something of a novelty (the first commercially produced SEM only coming on the market in 1965) and its use as an instrument in serious wood research was still treated by many with a good deal of suspicion. Such suspicions were not without foundation for indeed the first Three-dimensional Structure of Wood was put together from a somewhat paltry collection of a few hundred scanning electron micrographs of wood taken over a two year period. The last decade has seen some remarkable developments in the general understanding of the structure of wood. Our personal collection of scanning electron micrographs has grown from a few hundred to some 16 000. Techniques for specimen preparation [46, 47], particularly in the areas of dehydration [36] and coating have greatly improved. Most significant however, has been the new depth of understanding of wood ultrastructure that has become almost universal. By combining the use of the light, transmission and scanning electron microscopes, scientists in many widely separated parts of the world have now added a vast amount of information to our understanding of such aspects of wood structure as perforation plate development, tylose formation, the formation of reaction wood, septate fibres ultrastructure, etc.
Three-dimensional Structure of Wood
Author: B. A. MeylanHandbook of Wood Chemistry and Wood Composites
Author: Roger M. RowellPublisher: CRC Press
ISBN: 0203492439
Category : Science
Languages : en
Pages : 505
Book Description
The degradable nature of high-performance, wood-based materials is an attractive advantage when considering environmental factors such as sustainability, recycling, and energy/resource conservation. The Handbook of Wood Chemistry and Wood Composites provides an excellent guide to the latest concepts and technologies in wood chemistry and bio-based composites. The book analyzes the chemical composition and physical properties of wood cellulose and its response to natural processes of degradation. It describes safe and effective chemical modifications to strengthen wood against biological, chemical, and mechanical degradation without using toxic, leachable, or corrosive chemicals. Expert researchers provide insightful analyses of the types of chemical modifications applied to polymer cell walls in wood, emphasizing the mechanisms of reaction involved and resulting changes in performance properties. These include modifications that increase water repellency, fire retardancy, and resistance to ultraviolet light, heat, moisture, mold, and other biological organisms. The text also explores modifications that increase mechanical strength, such as lumen fill, monomer polymer penetration, and plasticization. The Handbook of Wood Chemistry and Wood Composites concludes with the latest applications, such as adhesives, geotextiles, and sorbents, and future trends in the use of wood-based composites in terms of sustainable agriculture, biodegradability and recycling, and economics. Incorporating over 30 years of teaching experience, the esteemed editor of this handbook is well-attuned to educational demands as well as industry standards and research trends.
A Nonlinear Three-dimensional Finite-element Model of a Light- Frame Wood Structure
Author: Bohumil KasalPublisher:
ISBN:
Category : Building, Wooden
Languages : en
Pages : 632
Book Description
The light-frame wood structure is an assemblage of several components such as walls, floors and roof connected by intercomponent connections such as nails or metal plates. The behavior of the full-structure is determined by the behavior of the individual components and connections. Whereas individual substructures were investigated both experimentally and analytically, there is a lack of research aimed to incorporate individual components of the light-frame wood building into the full-structure model. This research provides an analytical tool to investigate the behavior of light-frame wood structures loaded by static loads. Special attention is given to load sharing among wall components. A one story, 16- by 32-ft (4.88- by 9.75-m) wood-frame building was tested under cyclic quasi-static loads. Results of the experiment were used to verify a nonlinear finite-element model of the full building. Concepts of superelements and substructuring are applied to the finite-element problem. A special quasi-superelement energetically equivalent to a three-dimensional finite-element model of the full substructure was developed to represent the walls. Intercomponent connections were transformed into one-dimensional nonlinear elements, which had properties obtained from experiments and detailed finite-element analyses. The full structure was an assemblage of the superelements representing floor and roof, and quasi-superelements, which represented walls and intercomponent connections. Boundary conditions and loads used in the experiment were applied to the model, and deformations and reaction forces were compared. A sensitivity study of the model was performed, and the influences of the properties of substructures and intercomponent connections on the load sharing capability of the model were investigated. The response of the three-dimensional model of the full-structure to the static wind loads was studied and compared with currently used analytical models. Linear and nonlinear analytical models for computing reaction forces in the shear walls were proposed and their sensitivity studied. Stress analysis of the three-dimensional substructure was performed when the full model was loaded by a combination of dead, snow and wind load. Use of tensorial strength criteria as a part of the postprocessing procedure was demonstrated on evaluation of stresses in plywood sheathing.
Three Dimensional Surface Quality Evaluation of Wood
Author: Jimesh Shashikant ThakerPublisher:
ISBN:
Category : Wood
Languages : en
Pages : 198
Book Description
Three-Dimensional Electron Microscopy of Macromolecular Assemblies
Author: Joachim FrankPublisher: Oxford University Press
ISBN: 0190292881
Category : Science
Languages : en
Pages : 432
Book Description
Cryoelectron microscopy of biological molecules is among the hottest growth areas in biophysics and structural biology at present, and Frank is arguably the most distinguished practitioner of this art. CryoEM is likely over the next few years to take over much of the structural approaches currently requiring X-ray crystallography, because one can now get good and finely detailed images of single molecules down to as little as 200,000 MW, covering a substantial share of the molecules of greatest biomedical research interest. This book, the successor to an earlier work published in 1996 with Academic Press, is a natural companion work to our forthcoming book on electron crystallography by Robert Glaeser, with contributions by six others, including Frank. A growing number of workers will employ CryoEM for structural studies in their own research, and a large proportion of biomedical researchers will have a growing interest in understanding what the capabilities and limits of this approach are.
Industrial Enzymes
Author: Julio PolainaPublisher: Springer Science & Business Media
ISBN: 1402053770
Category : Science
Languages : en
Pages : 629
Book Description
Recent developments in genetic engineering and protein chemistry are bringing ever more powerful means of analysis to bear on the study of enzyme structure. This volume reviews the most important types of industrial enzymes. In a balanced manner it covers three interrelated aspects of paramount importance for enzyme performance: three-dimensional protein structure, physicochemical and catalytic properties, and the range of both classical and novel applications.