NRDC Fact Sheet: Amazon Mahogany
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TFEC 1-2019 Standard for Design of Timber Frame Structures And
TFEC 1-2019 Standard for Design of Timber Frame Structures and Commentary TFEC 1-2019 Standard Page 1 January 2019 TFEC 1-2019 Standard for Design of Timber Frame Structures and Commentary Timber Frame Engineering Council Technical Activities Committee (TFEC-TAC) Contributing Authors: Jim DeStefano Jeff Hershberger Tanya Luthi Jaret Lynch Tom Nehil Dick Schmidt, Chair Rick Way Copyright © 2019, All rights reserved. Timber Framers Guild 1106 Harris Avenue, Suite 303 Bellingham, WA 98225 TFEC 1-2019 Standard Page 2 January 2019 Table of Contents 1.0 General Requirements for Structural Design and Construction .......................................6 1.1 Applicability and Scope ........................................................................................ 6 1.2 Liability ................................................................................................................. 6 1.3 General Requirements ........................................................................................... 7 1.3.1 Strength ........................................................................................................... 7 1.3.2 Serviceability ................................................................................................... 7 1.3.3 General Structural Integrity ............................................................................. 7 1.3.4 Conformance with Standards .......................................................................... 7 1.4 Design Loads ........................................................................................................ -
Flexible Mating System in a Logged Population of Swietenia Macrophylla King (Meliaceae): Implications for the Management of a Threatened Neotropical Tree Species
Plant Ecol (2007) 192:169–179 DOI 10.1007/s11258-007-9322-9 ORIGINAL PAPER Flexible mating system in a logged population of Swietenia macrophylla King (Meliaceae): implications for the management of a threatened neotropical tree species Maristerra R. Lemes Æ Dario Grattapaglia Æ James Grogan Æ John Proctor Æ Roge´rio Gribel Received: 21 February 2007 / Accepted: 22 May 2007 / Published online: 19 June 2007 Ó Springer Science+Business Media B.V. 2007 Abstract Microsatellites were used to evaluate the crossed matings and that the remaining 6.75% had mating system of the remaining trees in a logged genotypes consistent with self-fertilisation. Apomixis population of Swietenia macrophylla, a highly valu- could be ruled out, since none of the 400 seedlings able and threatened hardwood species, in the Brazil- analysed had a multi-locus genotype identical to ian Amazon. A total of 25 open pollinated progeny its mother tree. The high estimate of the multi-locus arrays of 16 individuals, with their mother trees, were outcrossing rate (tm = 0.938 ± 0.009) using the mixed genotyped using eight highly polymorphic microsat- mating model also indicated that the population in ellite loci. Genotypic data analysis from the progeny this remnant stand of S. macrophylla was predomi- arrays showed that 373 out of the 400 seedlings nantly allogamous. The relatively large difference (93.25%) were unambiguously the result of out- between the multi-locus and single-locus outcrossing estimates (tmÀts = 0.117 ± 0.011) provides evidence that, in spite of the high outcrossing rate, a consid- & M. R. Lemes ( ) Á R. -
The Wood Lumber Company
Te Wood Lumber Company by Deborah Grifn Scanlon Tis story starts with Edmund Wood, who owned One hundred and three years later, Falmouth has the Greene and Wood Lumber Yard, a chain of about 32,000 year-round residents, too many lumber warehouses based in New Bedford that dwellings to count, LED streetlights and a 60-per- dated back to 1835. In 1912 Mr. Wood saw son police department. Te Miskells - Joseph’s potential for growth in Falmouth and decided to grandson, Dana Miskell, and his wife Eileen - still open a branch here. He bought James Cameron’s own, manage, and welcome new and old customers small lumber yard on Locust Street and named it to Te Wood Lumber Company. Te Wood Lumber Company. Te lumber business that Edmund Wood bought on Locust Street from Mr. Cameron was originally on King Street. Owned since at least 1875 by B. B. King, for whom the street was named, the business was purchased in 1895 by Mr. Cameron. A native of Scotland, Mr. Cameron came to Fal- mouth by way of Naushon Island, where he was superintendent of the Forbes’s farm. He operated the lumber business on King Street until 1909, when he moved it to Locust Street. Te frst build- ing he put up was a large cypress shed which was in Te frst Wood Lumber Co. ad in Te Enterprise, March use for many years. In 1912, Mr. Cameron sold his 12, 1912 business to Mr. Wood and then lived in Falmouth Joseph B. Miskell, the 22-year-old son of James in retirement for another 25 years. -
TREE RING CHARACTERISTICS of 30-YEAR-OLD SWIETENIA MACROPHYLLA PLANTATION TREES Cheng-Jung Lin* Chih-Hsin Chung Chih-Lung Cho Te
TREE RING CHARACTERISTICS OF 30-YEAR-OLD SWIETENIA MACROPHYLLA PLANTATION TREES Cheng-Jung Lin* Associate Researcher Department of Forest Utilization Taiwan Forestry Research Institute Taipei, Taiwan E-mail: [email protected] Chih-Hsin Chung Assistant Researcher Department of Forest Management Taiwan Forestry Research Institute Taipei, Taiwan E-mail: [email protected] Chih-Lung Cho Professor Department of Natural Resources National I-Lan University Ilan, Taiwan E-mail: [email protected] Te-Hsin Yang Assistant Professor Department of Forestry College of Nature Resource and Agriculture National Chung Hsing University Taichung, Taiwan E-mail: [email protected] (Received October 2011) Abstract. Ring characteristics of mahogany (Swietenia macrophylla K.) plantation trees grown in Taiwan were explored. Significant differences in average ring width (RW) and ring density (RD) occurred among three tree-diameter classes and three radial stages of ring numbers. RW in the radial direction decreased from the pith outward to the bark and followed a distinctive three-stage variation pattern (juvenile, transition, and mature zones). RD in the radial direction increased slowly from the pith outward to the bark. Wider tree rings and lower density are associated with juvenile wood close to the pith, whereas narrower tree rings and higher density are typical for mature wood outward toward the bark. RD in overtopped trees was higher than that in dominant trees. However, RW in dominant trees was wider than that in intermediate and overtopped trees. Earlywood density, latewood density, maximum density, and minimum density were the most important factors determining overall RD. There was a weak relationship between RW and RD, indicating that it is unlikely for growth rates of mahogany plantation trees to have a significant impact on wood density. -
Wood Preservation: Improvement of Mechanical Properties by Vacuum Pressure Process
International Journal of Engineering and Applied Sciences (IJEAS) ISSN: 2394-3661, Volume-2, Issue-4, April 2015 Wood Preservation: Improvement of Mechanical Properties by Vacuum Pressure Process Md. Fazle Rabbi, Md. Mahmudul Islam, A.N.M. Mizanur Rahman timber. The amount of damage by the second is negligible in comparison to the first enemies. By applying proper Abstract— Wood, being a biological product, is liable to preservation technique, it is possible to protect the timber deterioration unless it is properly protected. The main reasons of deterioration of timber in service are decay due to fungal from these enemies. Preservation is the only appropriate way infection, attack by insects (borers and white ants), marine to make the timber toxic and protect it [1]. organisms and fire. Protection of wood is carried out from these agents by using preservative which can properly be used by proper design of preservation plant. Proper design of such plant The primary importance of the preservation treatment of is very essential to increase the lifespan of wood economically. wood is to increase the life of the material in service, thus Among the various wood preservation techniques, pressure decreasing the ultimate cost of the product and avoiding the processes are the most permanent technique around the world need for frequent replacements [2]. The extension of the today. In the Full cell process, wood is allowed to absorb as much liquid chemicals as possible during the pressure period, service life of timber by the application of appropriate thus leaving the maximum concentration of preservatives in the preservatives has another significant effect in the field of treated area. -
Wood Properties of Teak (Tectona Grandis) from a Mature Unmanaged Stand in East Timor
J Wood Sci (2011) 57:171–178 © The Japan Wood Research Society 2011 DOI 10.1007/s10086-010-1164-8 ORIGINAL ARTICLE Isabel Miranda · Vicelina Sousa · Helena Pereira Wood properties of teak (Tectona grandis) from a mature unmanaged stand in East Timor Received: May 5, 2010 / Accepted: November 5, 2010 / Published online: March 17, 2011 Abstract The wood quality from 50- to 70-year-old Tectona carpentry. Teak wood is moderately hard and heavy, seasons grandis trees from an unmanaged forest in East Timor was rapidly, kiln dries well, and has overall good machining prop- assessed. The aim was to evaluate teak in mature stands that erties. It is prized mostly for its natural durability and high had undergone uncontrolled disturbances, e.g., fi re and local dimensional stability in association with pleasant aesthetics. community usage. Heartwood represented 91% of the tree Some end-user requirements include high heartwood content radius at a height of 1.7 m, and sapwood contained on average (at least 85%) and wood density (> 675 kg/m3) and suffi cient nine rings. The mean ring width showed within-tree and strength [modulus of rupture (MOR) > 135 N/mm2].1 between-tree variability. The chemical compositions of heart- Teak grows naturally in Southeast Asia and was intro- wood and sapwood were similar. Within-tree chemical varia- duced into other tropical and subtropical regions in Austra- tion occurred only in terms of extractives, which increased lia, Africa, and Latin America. Teak is now one of the most from the pith (8.3%) to the heartwood–sapwood transition important species for tropical plantation forestry, mostly (12.7%) and decreased in the sapwood (9.2%). -
Tall Wood Buildings in the 2021 IBC up to 18 Stories of Mass Timber
Tall Wood Buildings in the 2021 IBC Up to 18 Stories of Mass Timber Scott Breneman, PhD, SE, WoodWorks – Wood Products Council • Matt Timmers, SE, John A. Martin & Associates • Dennis Richardson, PE, CBO, CASp, American Wood Council In January 2019, the International Code Council (ICC) approved a set of proposals to allow tall wood buildings as part of the 2021 International Building Code (IBC). Based on these proposals, the 2021 IBC will include three new construction types—Type IV-A, IV-B and IV-C—allowing the use of mass timber or noncombustible materials. These new types are based on the previous Heavy Timber construction type (renamed Type IV-HT) but with additional fire-resistance ratings and levels of required noncombustible protection. The code will include provisions for up to 18 stories of Type IV-A construction for Business and Residential Occupancies. Based on information first published in the Structural Engineers Association of California (SEAOC) 2018 Conference Proceedings, this paper summarizes the background to these proposals, technical research that supported their adoption, and resulting changes to the IBC and product-specific standards. Background: ICC Tall Wood Building Ad Hoc Committee Over the past 10 years, there has been a growing interest in tall buildings constructed from mass timber materials (Breneman 2013, Timmers 2015). Around the world there are now dozens of timber buildings constructed above eight stories tall. Some international examples include: Building Completion Location Stories Name Date Stadhaus -
Restoration of the American Chestnut in New Jersey
U.S. Fish & Wildlife Service Restoration of the American Chestnut in New Jersey The American chestnut (Castanea dentata) is a tree native to New Jersey that once grew from Maine to Mississippi and as far west as Indiana and Tennessee. This tree with wide-spreading branches and a deep broad-rounded crown can live 500-800 years and reach a height of 100 feet and a diameter of more than 10 feet. Once estimated at 4 billion trees, the American chestnut Harvested chestnuts, early 1900's. has almost been extirpated in the last 100 years. The U.S. Fish and Wildlife Service, New Jersey Field Value Office (Service) and its partners, including American Chestnut The American chestnut is valued Cooperators’ Foundation, American for its fruit and lumber. Chestnuts Chestnut Foundation, Monmouth are referred to as the “bread County Parks, Bayside State tree” because their nuts are Prison, Natural Lands Trust, and so high in starch that they can several volunteers, are working to American chestnut leaf (4"-8"). be milled into flour. Chestnuts recover the American chestnut in can be roasted, boiled, dried, or New Jersey. History candied. The nuts that fell to the ground were an important cash Chestnuts have a long history of crop for families in the northeast cultivation and use. The European U.S. and southern Appalachians chestnut (Castanea sativa) formed up until the twentieth century. the basis of a vital economy in Chestnuts were taken into towns the Mediterranean Basin during by wagonload and then shipped Roman times. More recently, by train to major markets in New areas in Southern Europe (such as York, Boston, and Philadelphia. -
Creating a Timber Frame House
Creating a Timber Frame House A Step by Step Guide by Brice Cochran Copyright © 2014 Timber Frame HQ All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, recording or otherwise, without the prior written permission of the author. ISBN # 978-0-692-20875-5 DISCLAIMER: This book details the author’s personal experiences with and opinions about timber framing and home building. The author is not licensed as an engineer or architect. Although the author and publisher have made every effort to ensure that the information in this book was correct at press time, the author and publisher do not assume and hereby disclaim any liability to any party for any loss, damage, or disruption caused by errors or omissions, whether such errors or omissions result from negligence, accident, or any other cause. Except as specifically stated in this book, neither the author or publisher, nor any authors, contributors, or other representatives will be liable for damages arising out of or in connection with the use of this book. This is a comprehensive limitation of liability that applies to all damages of any kind, including (without limitation) compensatory; direct, indirect or consequential damages; income or profit; loss of or damage to property and claims of third parties. You understand that this book is not intended as a substitute for consultation with a licensed engineering professional. Before you begin any project in any way, you will need to consult a professional to ensure that you are doing what’s best for your situation. -
Chemometric Differentiation of Dipterocarpaceae Wood Species Based on Colorimetric Measurements
Philippine Journal of Science 148 (3): 473-480, September 2019 ISSN 0031 - 7683 Date Received: 22 Feb 2019 Chemometric Differentiation of Dipterocarpaceae Wood Species Based on Colorimetric Measurements Monica Gibe1, Justine M. Kalaw2, Willie P. Abasolo1, and Fortunato Sevilla III2,3* 1College of Forestry and Natural Resources University of the Philippines Los Baños, Laguna 4031, Philippines 2Graduate School, University of Santo Tomas España Blvd., Manila 1015, Philippines 3Research Center for the Natural and Applied Sciences, University of Santo Tomas, España Blvd., Manila 1015, Philippines The international trade of illegal timber often involves the misdeclaration of the wood species. A simple and reliable means for the differentiation of wood species could contribute to the control of this fraud. In this study, eight (8) commercially important and endangered dipterocarp timber wood species and mahogany were differentiated through colorimetric measurements carried out on hot water and ethanol extracts from the samples. Colorimetric measurements were done using a fabricated colorimeter that measured the absorption of blue, green, and red radiation. Chemometric analysis of the colorimetric data using principal component analysis (PCA) and hierarchical cluster analysis (HCA) revealed clustering, which enabled an efficient differentiation of the wood species. Keywords: Dipterocarps, optical absorption, pattern recognition, wood extractives, wood species differentiation INTRODUCTION Several techniques have been applied for the determination of wood identity. Presently, the most frequently used The development of rapid and accurate methods for the method for timber identification is the visual analysis differentiation of wood species presents a challenge. A of the wood’s anatomical features. This technique is need has been expressed for methodologies that can be capable of identification to the genus level only, but applied for the definitive identification of illegally cut often information on the species level is needed (Gasson logs (Dormontt et al. -
MAHOGANY TYPES South American Mahogany. ( Swietenia
MAHOGANY TYPES South American Mahogany. ( Swietenia Macrophylla) the 'top of the range' of all the Mahoganies( both as to be qualities and price). The classic characteristics of this timber are its stability and durability along with its world renowned beauty and versatility. One well recognised feature is the way in which this timber gradually darkens in colour on exposure from a red / brown colour to a rich dark red . Density : 540 kg/m3 or 34 pounds / cubic foot. African Mahogany (Khaya Ivorensis) is considered by some to be more attractive in grain structure to South American Mahogany. This is because the grain patterns of African Mahogany can vary so widely, particularly in the backsawn face. Some people prefer the startling ribbon grain appearance of quarter sawn Mahogany. The colour of this timber varies from gold through brown to red / brown. African Mahogany is more available and less expensive than South American Mahogany. Density : 540kg / m3 or 34 pounds / cubic foot. Plantation Mahogany ( Grown in Fiji) (Swietenia Macrophylla) this timber is the product of commercial plantations of the South American tree grown in Fiji. Because the timber is grown in managed plantations, branch trimmings cause a birdseye like effect on the face of the boards. Generally speaking, the characteristics are similar to the South American species described above. However the plantations lack the maturity of the South American product. One outcome is a recognisable difference in stability. Density : 540 kg / m3 or 34 pounds / cubic foot. Eastern Mahogany (Chukrassia Tabularis) this member of Mahogany family originates from Malaysia. In its colouring it more closely resembles a Walnut. -
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