Bibliography of Agriculture PDF Download
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Author:
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 1732
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Book Description
Author:
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 1732
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Book Description
Author: Peter Koch
Publisher:
ISBN:
Category : Forest products
Languages : en
Pages : 944
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Book Description
Author:
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 1252
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Book Description
Author: Michael A. Ritter
Publisher:
ISBN: 9781410221919
Category : Technology & Engineering
Languages : en
Pages : 500
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Book Description
Timber's strength, light weight, and energy-absorbing properties furnish features desirable for bridge construction. Timber is capable of supporting short-term overloads without adverse effects. Contrary to popular belief, large wood members provide good fire resistance qualities that meet or exceed those of other materials in severe fire exposures. From an economic standpoint, wood is competitive with other materials on a first-cost basis and shows advantages when life cycle costs are compared. Timber bridges can be constructed in virtually any weather conditions, without detriment to the material. Wood is not damaged by continuous freezing and thawing and resists harmful effects of de-icing agents, which cause deterioration in other bridge materials. Timber bridges do not require special equipment for installation and can normally be constructed without highly skilled labor. They also present a natural and aesthetically pleasing appearance, particularly in natural surroundings. The misconception that wood provides a short service life has plagued timber as a construction material. Although wood is susceptible to decay or insect attack under specific conditions, it is inherently a very durable material when protected from moisture. Many covered bridges built during the 19th century have lasted over 100 years because they were protected from direct exposure to the elements. In modem applications, it is seldom practical or economical to cover bridges; however, the use of wood preservatives has extended the life of wood used in exposed bridge applications. Using modem application techniques and preservative chemicals, wood can now be effectively protected from deterioration for periods of 50 years or longer. In addition, wood treated with preservatives requires little maintenance and no painting. Another misconception about wood as a bridge material is that its use is limited to minor structures of no appreciable size. This belief is probably based on the fact that trees for commercial timber are limited in size and are normally harvested before they reach maximum size. Although tree diameter limits the size of sawn lumber, the advent of glued-laminated timber (glulam) some 40 years ago provided designers with several compensating alternatives. Glulam, which is the most widely used modem timber bridge material, is manufactured by bonding sawn lumber laminations together with waterproof structural adhesives. Thus, glulam members are virtually unlimited in depth, width, and length and can be manufactured in a wide range of shapes. Glulam provides higher design strengths than sawn lumber and provides better utilization of the available timber resource by permitting the manufacture of large wood structural elements from smaller lumber sizes. Technological advances in laminating over the past four decades have further increased the suitability and performance of wood for modern highway bridge applications.
Author: Daniel A. Jessup
Publisher:
ISBN:
Category : Building materials
Languages : en
Pages : 16
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Book Description
Author: Valerie Dorge
Publisher: Getty Publications
ISBN: 0892365013
Category : Art
Languages : en
Pages : 549
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Book Description
The function of the painted wooden object ranges from the practical to the profound. These objects may perform utilitarian tasks, convey artistic whimsy, connote noble aspirations, and embody the highest spiritual expressions. This volume, illustrated in color throughout, presents the proceedings of a conference organized by the Wooden Artifacts Group of the American Institute for Conservation of Historic and Artistic Works (AIC) and held in November 1994 at the Colonial Williamsburg Foundation in Williamsburg, Virginia. The book includes 40 articles that explore the history and conservation of a wide range of painted wooden objects, from polychrome sculpture and altarpieces to carousel horses, tobacconist figures, Native American totems, Victorian garden furniture, French cabinets, architectural elements, and horse-drawn carriages. Contributors include Ian C. Bristow, an architect and historic-building consultant in London; Myriam Serck-Dewaide, head of the Sculpture Workshop, Institut Royal du Patrimoine Artistique, Brussels; and Frances Gruber Safford, associate curator of American decorative arts at the Metropolitan Museum of Art in New York. A broad range of professionals—including art historians, curators, scientists, and conservators—will be interested in this volume and in the multidisciplinary nature of its articles.
Author: Harold Scofield Betts
Publisher:
ISBN:
Category : Longleaf pine
Languages : en
Pages : 16
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Book Description
Author: Thomas C. Jester
Publisher: Getty Publications
ISBN: 1606063251
Category : Architecture
Languages : en
Pages : 354
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Book Description
Over the concluding decades of the twentieth century, the historic preservation community increasingly turned its attention to modern buildings, including bungalows from the 1930s, gas stations and diners from the 1940s, and office buildings and architectural homes from the 1950s. Conservation efforts, however, were often hampered by a lack of technical information about the products used in these structures, and to fill this gap Twentieth-Century Building Materials was developed by the U.S. Department of the Interior’s National Park Service and first published in 1995. Now, this invaluable guide is being reissued—with a new preface by the book’s original editor. With more than 250 illustrations, including a full-color photographic essay, the volume remains an indispensable reference on the history and conservation of modern building materials. Thirty-seven essays written by leading experts offer insights into the history, manufacturing processes, and uses of a wide range of materials, including glass block, aluminum, plywood, linoleum, and gypsum board. Readers will also learn about how these materials perform over time and discover valuable conservation and repair techniques. Bibliographies and sources for further research complete the volume. The book is intended for a wide range of conservation professionals including architects, engineers, conservators, and material scientists engaged in the conservation of modern buildings, as well as scholars in related disciplines.
Author: Roger M. Rowell
Publisher: CRC Press
ISBN: 0203492439
Category : Science
Languages : en
Pages : 505
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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.
Author: Dick Sandberg
Publisher: CRC Press
ISBN: 1351028200
Category : Nature
Languages : en
Pages : 765
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Book Description
The market for durable products using modified wood has increased substantially during the last few years. This is partly because of the restriction on the use of toxic preservatives due to environmental concerns, and to lower maintenance cost and time. Furthermore, as sustainability becomes a greater concern, the environmental impact of construction and interior materials is factored in planning by considering the whole life cycle and embodied energy of the materials used. Wood is modified to improve its intrinsic properties, enhance the range of applications of timber, and to acquire the form and functionality desired by engineers without calling the environmental friendliness into question. Wood modification processes are at various stages of development, and the challenges faced in scaling up to industrial applications differ. The aim of this book is to put together the key elements of the changes of wood constituents and the related changes in wood properties of modified wood. Further, a selection of the principal technologies implemented in wood modification are presented. This work is intended for researchers, professionals of timber construction, as well as students studying the science of materials, civil engineering and architecture. This work is not exhaustive, but intends to deliver an outline of the scientific disciplines necessary to apprehend the technologies of wood modification and its behavior during treatment, as well as during its use.
