Is porous wood structure exclusive of deciduous trees? Les bois poreux sont-ils exclusifs des arbres décidus ?

Published Date
November 2007, Vol.6(6):385–391, doi:10.1016/j.crpv.2007.09.009
La paléobotanique et l'évolution du monde végétal : quelques problèmes d'actualité

Systematic Palaeontology (Palaeobotany)

Author 

Written on invitation of the Editorial Board

Anaïs Boura ^,

Dario De Franceschi

UMR CNRS–MNHN n° 5143 ‘Paléobiodiversité et paléoenvironnements’, CP 38, 57, rue Cuvier, 75231 Paris cedex 05, France

Received 25 May 2007. Accepted 20 September 2007. Available online 19 November 2007.

Abstract

According to the IAWA committee (1989), the ring-porous wood is defined as a “wood in which the vessels in the earlywood are distinctly larger than those in the latewood of the previous and of the same growth ring.” This ring-porous structure is mainly present in regions with contrasted seasons. Some authors have mentioned the potential correlation between ring-porous structure and the deciduousness of the trees, but no precise inventory of species has been provided until now to verify this hypothesis. We compared, with the help of Insidewood (2004) and diverse floras, the wood porosity of 1176 species from temperate countries and 3886 from tropical countries as well as their foliage characteristics. As wood features are frequently preserved in fossil specimens, they could constitute an interesting marker of vegetation type and be used to infer the seasonality of the palaeoclimate.

Résumé

D’après le IAWA Committee (1989), le bois à zone poreuse est défini comme un « bois dans lequel les pores du bois initial sont manifestement plus gros que ceux du bois final de l’année précédente et du même cerne. » Ce type de porosité du bois est principalement retrouvé dans les régions à forte saisonnalité. La corrélation potentielle entre cette structure poreuse du bois et le caractère caducifolié des arbres a été mentionnée par de nombreux auteurs, mais aucun inventaire précis n’a été réalisé jusqu’à présent pour vérifier cette hypothèse. Nous avons comparé, grâce à Insidewood (2004) et à diverses flores, la porosité de 1176 espèces de pays tempérés et 3886 espèces de pays tropicaux et le caractère décidu de leur feuillage. Les caractères du bois sont fréquemment préservés dans les spécimens fossiles ; ils pourraient donc constituer des marqueurs fiables du type de végétation et pourraient ainsi être utilisés pour déduire la saisonnalité des paléoclimats.

Keywords

Ring-porous wood

Deciduousness

Leaves

Seasonality

Mots clés

• Bois à zone poreuse
• Décidu
• Caducité
• Feuilles
• Saisonnalité

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  Corresponding author.
  
  

For further details log on website :
http://www.sciencedirect.com/science/article/pii/S1631068307001054

Saw Filing, Scanning, Profiling, Controls Highlight Lumber Manufacturing Workshop At TP&EE

by TPEE Editor on AUGUST 8, 2016  in UPDATES

Fifteen presentations make up the Lumber Manufacturing Workshop, which will be held Thursday, September 29, during the Timber Processing & Energy Expo at the Portland Exposition Center in Portland, Ore. TP&EE will be held September 28-30.

TP&EE is produced by Hatton-Brown Expositions, LLC, an affiliate of Timber Processing and Panel World magazines. This will be the third TP&EE.

“There’s a great range of topics in this workshop,” comments Rich Donnell, Show Director. “We’ll basically have two meeting rooms going on simultaneously with presentations during the morning and afternoon. You can’t beat what you’ll get for the cost.”

Cost of the Lumber Manufacturing Workshop is only $75, which includes access to any of the presentations, a three-day pass to the expo exhibits, and a beer and brat ticket for the expo Beer Garden.

Here’s the workshop schedule:

Thursday, September 29

Room I

9:30 a.m.—Automation in the Filing Room, Justin Williams, CEO, Williams and White

10:00 a.m.—Automated Leveling and Tensioning for Saw Plate, Matt Tulleners, Territory Manager/Intermountain Region, Simonds International

10:30 a.m.—Computerized Vibration Analysis of Circular Saw Tension, Jason Allen, V.P. of Sales, Burton Saw and Supply

11:00 a.m.—Saw Guide Maintenance for Dummies, Mike West, Head Filer, Cascade Hardwood

Noon-1:25 p.m. TP&EE Exhibits, Lunch on Your Own

Room II

9:30 a.m.—Use Scanning to Turn Your Edger into a Lean, Mean, Money-Making Machine, Joey Nelson, President, JoeScan

10:00 a.m.—The Latest Profiling Technologies, Ron McGehee, R&D New Product Development, Bid Group

10:30 a.m.—Latest Technologies at the Sawmill & Planer Mill, Yvan Rainville, Vice-President Sales & Marketing, Autolog

11:00 a.m.—GradeScan-Built for the Future, Ellen Nelson, CFO, Ryan Shear, Software Engineer, Lucidyne Technologies

Noon-1:25 p.m. TP&EE Exhibits, Lunch on Your Own

Room I

1:30 p.m.—Automatic Log Scaling and Processing, Norvin Laudon, Chief Technology Officer, Springer Microtec

2:00 p.m.—Big Data and The Connected Mill, Rory Armes, CEO, Bill Harrison, Director of Production, Cumul8 Technologies

2:30 p.m.—Innovative Ripsawing Technology, Scanning & Optimizing, Dr. Stefan Möhringer, Managing Director, Simon Möhringer Engineering GmbH

3:00 p.m.—Pellets: How to Get More from Your Wood Chips and Sawdust, Forcus Martinez, Mechanical Engineer, Prodesa

Room II

1:30 p.m.—Technological Advances in Hydraulics and Controls, Richard Vetter, Vice-President, AMS Solutions, Rodney Trail, Industry Sector Manager Wood & Paper, Bosch Rexroth Canada

2:00 p.m.—Closed Loop Control with Second Derivative Gain Saves the Day, Peter Nachtwey, President, Delta Computer Systems

2:30 p.m.—Equipment Safety Certification for Class II (Wood Dust) Environments, Vivek Prasad, Hazardous Locations Team Lead, Casey Trimble, Account Manager, Intertek

TP&EE will feature more than 200 equipment and technology exhibitors and more than 60,000 square feet of exhibit space. The event caters to primary producers of lumber, plywood and engineered wood products.

For further information log on website :
http://www.timberprocessingandenergyexpo.com/saw-filing-scanning-profiling-controls-highlight-lumber-manufacturing-workshop-tpee/

Cross-Laminated Timber, New Panel Production Technologies Highlight Plywood And EWP Workshop

Author

by TPEE Editor on AUGUST 2, 2016  in UPDATES

A new engineered wood product called cross-laminated timber, new plywood mills and new technologies will be among the subjects addressed at the Plywood and Engineered Wood Products Manufacturing Workshop scheduled for Wednesday, September 28, during the Timber Processing & Energy Expo. TP&EE will be held September 28-30 at the Portland Exposition Center in Portland, Ore.

TP&EE is produced by Hatton-Brown Expositions, LLC, an affiliate of Panel World and Timber Processing magazines. This will be the third TP&EE.

The morning session will focus on veneer and plywood manufacturing, including a presentation by Winston Plywood & Veneer President Dick Baldwin. Winston Plywood & Veneer is starting up a plywood mill in Winston, Miss.

The afternoon session focuses on cross-laminated timber and includes a talk by Valerie Johnson, President of D.R. Johnson Wood Innovations, one of the leaders in the CLT production movement. Johnson’s talk is entitled, If the Sky Is the Limit for CLT’s, What Will It Take to Get Us There?

Dr. Fred Kurpiel of Georgia Research Institute has assembled the presenters and will moderate the workshop.

Wednesday, September 28

9:20 a.m.—Modern Veneer Dryers and Profit, Alan Knokey, Vice President, USNR

9:50 a.m.—Making the Most of Your Dry Veneer Upgrade Improvements to Increase Profits, Martin Murphy, Senior Vice President, Raute North America

10:20 a.m.—New Technology for Veneer Lathe Systems, Tim Fisher, Veneer/Panel Business Development Manager, USNR

10:50 a.m.—New Developments in Veneer Peeling Lines—Automated Green End, Anna McCann, President, Merritt Machinery

11:20 a.m.—Outlook for North American Plywood and New Plywood Mill, Dr. Richard Baldwin, President, Winston Plywood & Veneer

Noon-1:25 p.m. TP&EE Exhibits, Lunch on Your Own

1:30 p.m.—If the Sky Is the Limit for CLT’s, What Will It Take to Get Us There? Valerie Johnson, President, D.R. Johnson Wood Innovations

2:05 p.m.—The State of the Global CLT Industry—A Survey in Progress, Dr. Lech Muszynski, Associate Professor, Department of Wood Science and Engineering, Oregon State University

2:40 p.m.—Mass Timber Construction in the Forest Industry Infrastructure, Thomas Robinson, Principal and Founder, LEVER Architecture

3:15 p.m.—Unique New Press Design for Manufacturing CLT Panels, Sam Pope, Capital Sales Manager, Western North America, USNR

3:50 p.m.—Inspired by Smart Technology—Second Wave of CLT Investment on the Way in Europe, Dominik Wolfschuetz, German Woodworking Machinery Manufacturers Association (VDMA); Gerhard Binder, Projecting and Sales, Minda

The cost of the Plywood and EWP Manufacturing Workshop is only $75 and includes an exhibit floor pass for the entire length of the expo, as well as a beer and a brat ticket for the Beer Garden.

TP&EE will feature 200 equipment and technology exhibitors and more than 60,000 square feet of exhibit space. The event caters to primary producers of lumber, plywood and engineered wood products.

For further information log on website :
http://www.timberprocessingandenergyexpo.com/tag/cross-lamianted-timber/

WOOD INNOVATION AND DESIGN CENTRE

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MGA VANCOUVER
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© Copyright 2016, MICHAE

WOOD INNOVATION AND DESIGN CENTRE

Prince George, BC

The Wood Innovation and Design Centre (WIDC) serves as a gathering place for researchers, academics, design professionals and others interested in generating ideas for innovative uses of wood. The University of Northern BC occupies the lower three floors of the building with facilities for the Master of Engineering in Integrated Wood Design. Upper floors provide office space for government and wood industry-related organizations, as well as the planned Emily Carr University of Art + Design Centre for Design Innovation and Entrepreneurship. The eight-storey building (6 storey with mezzanine plus penthouse), stands 29.5m tall — for the moment, the world’s tallest modern all-timber structure, a benchmark soon to be broken by other mass timber buildings in the works.

Achievements & Awards 

2016 Governor General’s Award in Architecture

2015 RAIC Award of Excellence for Innovation in Architecture

2015 Lieutenant-Governor of BC Award in Architecture (Merit)

2015 AIBC Innovation Award

As a facility conceived to showcase the potential for building mid-rise and high-rise structures using engineered mass timber products, there is no concrete used in the building above the ground floor slab, with the exception of mechanical penthouse. The design incorporates a simple, ‘dry’ structure of systems-integrated CLT floor panels, Glulam columns and beams, and mass timber walls. This simplicity translates into repeatability of the system. Instead of focusing solely on a showpiece structure, we created a building that can be easily replicated. This was a fundamental choice, made in the interest of seeing many more architects, engineers, and private developers recognize the value of mass timber design as alternative to steel and concrete. This is the best way to ensure that the BC wood economy grows: Through repeatable meaningful innovation.

WIDC is about celebrating wood as one of the most beautiful and sustainable materials for building here in BC and around the globe. MGA have been champions of this message for quite some time and have been able to connect to a very global conversation of possibility. Our goal is to use the WIDC design as a stepping-stone for further innovation and scale that will continue to grow the wood story and industry.

The design celebrates the beauty of wood, and shows the potential to increase the use of wood in mid-rise and high-rise structures. We hope that the WIDC project will help advance and revitalize the Prince George Community, the BC forest economy, and the global conversation of the future of wood architecture.

Public Announcement Presentation March 22, 2013 – PDF

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For further information log on website :
http://mg-architecture.ca/work/wood-innovation-design-center/

Emigration House

For further information log on website :
http://www.architectmagazine.com/project-gallery/emigration-house

Steven Christensen Architecture

SHARED BY

Victoria Carodine, Hanley Wood

PROJECT NAME

Emigration House

LOCATION

Emigration Township, 

UT

84108

PROJECT STATUS

On the Boards/In Progress

SIZE

6,500 sq. feet

TEAM

• Steven Christensen
• Devon Montminy
• Cori Gunderson

AWARDS

• Residential Architect Design Awards

  2016 
  On the Boards: Honorable Mention

TYPE

Single Family

Sports

SCOPE

New Construction

View all (25) images

By NATE BERG

2016 Residential Architect Design Awards
On the Boards: Honorable Mention

Designed by Steven Christensen Architecture, the Emigration House was originally sited on a ridge on its mountain canyon site in Emigration Township, Utah. But this being the type of place where people want to look at mountains and not houses, it seemed prudent to change the location to the back side of a knoll. Now the 6,500-square-foot house drops mostly out of sight, while still taking advantage of views of unoccupied sections of the surrounding mountains. The house’s angular forms are imposing at times, but its elongated Z-shaped form—in plan and section—follows the site’s topography and opens itself to the warmth and sunlight of its southern exposure.

PROJECT DESCRIPTION

The canon of architecture offers many significant examples of hillside houses cascading down toward a significant view. This project addresses an unusual site constraint, where the best view is over your shoulder.

This 6.8 acre Emigration Canyon site, located on the overland carriage route shared by prominent migrants from the Donner Party to the Mormon Pioneers, sits partially atop a prominent ridge that offers spectacular views of surrounding peaks and the city lights below. Like many sites with expansive views, this site is prominently visible, and although the platted building pad sits squarely atop the ridge, placement of a home there would substantially disrupt existing mountain silhouettes.

This design seeks to preserve the natural character of the canyon and avoid the 'cherry on top of the sundae' site strategy dictated by the plat. Oriented on the back side of the knoll, and humble in scale by neighborhood standards, the house stands discreetly away from the street and hugs tightly to the topography. Rather than cascading down the primary slope toward a view of other houses, the form reaches upward, climbing toward the tiny part of the site where it can sneak a peek at the city below without obstructing ridge views from afar. Meanwhile, the broad south side of the home opens up toward Dale Benchmark and Perkins Peak: 90 degrees of protected mountain views. Strategic site placement and a binary approach to glazing ensure that this house in a highly developed canyon will have no man-made objects in sight, except for the view it frames toward the Salt Lake Valley through the canyon mouth below.

Our design for the home was motivated by an interest in the manipulation of vernacular roof forms, a current preoccupation of our practice that has spanned across several recent projects. We began with a simple rectangular bar scheme, bending it into an elongated ‘Z’ in both plan and section in order to adhere to the slope of the site and direct the view upon entry toward Dale Benchmark and Perkins Peak. This simple manipulation to the plan is registered by a series of contortions within the project's gable roof, transforming its recognizable form into a distorted and faceted topography. This roof form extends down the north side of the house, shielding it from winter cold and undesirable views toward neighboring homes, while cantilevering over the south elevation to invite in winter sun and unspoiled mountain views. As one moves from the home's public street view toward its private backyard, the form’s legibility as a closed prismatic solid begins to unfold into an architecture of immaterial planes.

- Selected for 2015 AIA Emerging Professionals Exhibition, American Institute of Architects National Headquarters, Washington DC