Book.
1944 - Gale Group | World Scholar Latin America
Thomas William Goodrich, Nadia Nawaz, S. Feih, Brian Y. Lattimer, A.P. Mouritz,
... recovery of the compression strength properties of structural balsa wood (Ochroma pyramidale). Balsa is a core material used in sandwich composite ... This article investigates the thermal softening response of balsa with increasing temperature, and the thermal recovery behavior when softened balsa is cooled following heating. Exposure to elevated temperatures ... fire or postfire scenario. The compression strength of balsa decreased progressively with increasing temperature from 20° to ... in the axial and radial directions of the balsa grains. Thermogravimetric analysis revealed only small mass losses (< ...
Tópico(s): Lignin and Wood Chemistry
2010 - Springer Science+Business Media | Journal of Wood Science
Book.
1944 - Gale Group | World Scholar Latin America
Ruibang Luo, Yiu-Lun Wong, Wai-Chun Law, Lap-Kei Lee, Jeanno Cheung, Chi-Man Liu, Tak‐Wah Lam,
This paper reports an integrated solution, called BALSA, for the secondary analysis of next generation sequencing data; it exploits the computational power of GPU and an intricate memory management to give ... raw reads to variants (including SNPs and Indels), BALSA, using just a single computing node with a ... 25 min for 210-fold whole exome sequencing. BALSA's speed is rooted at its parallel algorithms ... up processes like alignment, realignment and statistical testing. BALSA incorporates a 16-genotype model to support the ...
Tópico(s): Genomic variations and chromosomal abnormalities
2014 - PeerJ, Inc. | PeerJ
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... ordered out by Argentina, Second time lucky for balsa raft, S Vietnamese in offensive near Phnom Penh, ...
1970 - Gale Group | TDA
Meisam Shir Mohammadi, John A. Nairn,
... various fracture properties relevant to the use of balsa as a thick core material in sandwich composites ... of a laminated veneer lumber (LVL) made from balsa to the toughness of conventional butcher-block balsa material. When using a good lamination adhesive, an LVL balsa core material has enhanced toughness compared to solid balsa and the LVL balsa also has enhanced fiber bridging effects. When balsa core is adhered to fiber glass composite skins, ...
Tópico(s): Mechanical Behavior of Composites
2017 - Elsevier BV | Composites Part B Engineering
Don Evans, Jimmy Kent, Jimmy Knapp, Lynne Greenwood, Patrick Master, Barbara Hall, John Davison, Jon Swain, Graig Brown, Peter Gillman, Maurice Kelly, Rob Hughes, John Peter, Pam Barrett, Eric Dymock, Norman MacRae, Jill Hartley, Joanna Duckworth, Danby Bloch, Peter Walters, Neville Hodgkinson Medical Correspondent, John Diamond, Diana Wright Personal Finance Editor, David Gower, John Harding, Sally Payne, Anne Paddock, David Smith, Nick Pitt, Frederic Raphael, Mark Whittet, Cal McCrystal, Mark Hosenball, Denis Hamilton, Edward Welsh, Deborah Moggach, Willy Wicks, Caroline St John-Brooks, Patrick Stoddart, Mario Modiano, Robert Sandall, Susan Marling, Iain Johnstone, John Russell, Christian Jennings, David Brierley, Eddy Shan, Irwin Stelzer, Felicity Thoday, Ivan Fallon, Craig Raine, David Dougill, Stephen Warr, Geordie Greig Arts Correspondent, Joe Irving, Cliff Temple, Penelope Goodwin, Margarette Driscoll, D A Skinner, Susan Crosland, David Cairns, Peter Kemp, Adrianne Blue, Norman Harris, Julia Neuberger, Leslie Barratt, Peter Ustinow, Carol Price, Susan Grossman, Anne Moffat, Robert Harris, Michael Jones, Kate Figes, Peter Millar, Richard Palmer Environment Correspondent, Lisa Marie Craig, Frank Steele, George Perry, John Cassidy, Michael Elton Director General, Sue Mott, Robin Marlar, Philip Robinson, Charlotte Atkins, Bernard Cafferty, Stuart Wavell, Paul Donovan, James Power, Janette Marshall, Amit Roy, Bruce Kent, Michael Heseltine, Jeff Randall, Malcolm Smith, Dr Eric Rose, Paul Driver, James Adams, Clare Colvin, Michael Woods, Boris Schapiro, Ernest Saunders, David Hughes, Frances Duffy, Austin MacCurtain, David Leppard, Tim Rayment, Alan Bond, John Stalker, Elizabeth Grice, Wendy McFadden, Nick Gilbert, Michael Durham, John Hopkins, Ichiro Fujisaki Counsellor, Roy Lancaster, Martin Jacques, Brian Walden, Roger Williams, Peter Millar Central Europe Correspondent, Robin Marter, Iain Gordon, Gareth David, Brian Reading, Dr Martin A Schulman Editor, Kate Saunders, Kate Carr, Richard Cook, Greg Hadfield, Diana Wright, Craig Brown, Andrew Lorenz Industrial Editor, Rosie Boycott, Chris Horrie, Adam Lellor, Tony Dipple, Stephen Jones, Sean Wood, Desmond Shawe-Taylor, Brian Deer, T J Binyon, Geoffrey Van-Hay, Harry Mullan, Meriel McCooey, Andrew Grice, Ivan Hill, Frank Beardow, Christopher Hudson, Hanson, Miranda Seymour, Ian Birrell, Sally Soarnes, Safa Haeri, Dilys Powell, K. E. Mawady, Ben Pimlott, Toby Follett, Andrew Hogg, Brough Scott, Musrat Mir, Alison Beckett, Caroline McGhie, Richard Woods, Gay Doyle, Marion Hume, Lesley Gillilan, Maurice Chittenden, Joy Melville, P Sheehy Chairman, Barrie Penrose, Martyn Bond, David Hughes Chief Political Correspondent, Joan Stewart, Ian Dunning, John Walsh, Brian MacArthur, David Baldwin, Peter Chippindale, Michael Jones Political Editor, Hol Crane, D J Taylor, Jack Straw, Peter Mayle, Mihir Bose, Philip Beresford, Richard Burnell, Sue Thomas, Mark Whitaker, Greg Hadfield Education Correspondent, Peter Hounam Chief Investigative Reporter, Carmel McQuaid, Edward Pearce, Tony Brown, Adrian Dannatt, Simon Jenkins, Godfrey Golzen, Deirdre Fernand, George Steiner, Gareth David Deputy City Editor, Andrew Lorenz, Liam Clarke, Colin Greenland, Sir Peter Baldwin Chairman, Helen Nicoll Director, Clinton Greyn, John Parker, Marina Vaizey, Hugh Pearman, Jeff Randall City Editor, Richard Caseby, Margaret Park, Angela Long, Frank Field, Dorothy Wade, David Smith Economics Editor, Penny Perrick, James Saunders, Tony Hetherington, Paul Peat, Neil MacLean, Alan Lewis, Peter Roebuck, Mark Burton, Joanna Simon, Chris Blackhurst, Terry Lunn, Danny Danzier, Ellis Downes, James Adams Defence Correspondent, Hilary Bristow, Georgina Howell, Mark Wallington,
... John Miller Macmillan £11.95 pp227 Travellers Tales Balsa wood and sticky tape Blue Peter The Inside ...
1989 - Gale Group | Sunday Times HA GDA
Álvaro Cañadas-López, Diana Rade-Loor, Marianna Siegmund‐Schultze, Geovanny Moreira-Muñoz, J. Jesús Vargas‐Hernández, Christian Wehenkel,
Balsa trees are native to neotropical forests and frequently grow on fallow, degraded land. Balsa can be used for economic and ecological rehabilitation ... Ecuador is the world’s largest producer of balsa, there is a lack of knowledge about production indicators for management of balsa stands in the country. The aim of this ... index (SI) curves and stem volume models) for balsa plantations in the coastal lowlands of Ecuador. Balsa trees growing in 2161 plots in seven provinces ... and yield models for the native, although underutilized, balsa tree. Three curve models were fitted to determine ...
Tópico(s): Agroforestry and silvopastoral systems
2019 - Multidisciplinary Digital Publishing Institute | Forests
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... Surprise Purley, London Knocks-Out Nielsen. Picture Gallery: Balsa Boats of Lake Abaya, Law: Director On Tax ...
1963 - Gale Group | TDA
Yuan Wu, Marie-Laetitia Pastor, Marianne Perrin, Pascal Casari, Xiaojing Gong,
... on the characterisation of damage mechanisms of GFRP-balsa sandwich under static 4-point bending by coupling ... analysis of damage mechanisms of the complex GFRP-balsa sandwich. It verifies that cumulative counts can be ... duration distributions has been emphasized to better identify balsa core damages and skin/core debonding. It is interesting to find that balsa wood can release signals with peak frequency higher ... Finally, it concludes that damage mechanisms of GFRP-balsa sandwich under 4-point bending could occur in ...
Tópico(s): Wood Treatment and Properties
2023 - Elsevier BV | Composites Part B Engineering
David Douterlungne, Evert Thomas, Samuel I. Levy‐Tacher,
... we evaluate the potential of the pioneer tree balsa ( Ochroma pyramidale ) to control P teridium caudatum in ... Mexico. We tested different bracken cutting frequencies and balsa propagation methods in a factorial randomized block experiment. ... later, we quantified bracken biomass under the young balsa canopy. Living bracken rhizome biomass correlated significantly with balsa basal area, leaf litter biomass and understorey light ... was completely eradicated in plots with a minimum balsa basal area of 11 m 2 ha −1 . ...
Tópico(s): Fire effects on ecosystems
2013 - Wiley | Journal of Applied Ecology
Samuel I. Levy‐Tacher, Ivar Vleut, Francisco Román‐Dañobeytia, James Aronson,
... bracken rhizomes using several treatments: Direct sowing of balsa seeds (Ochroma pyramidale; Malvaceae), a traditional Lacandon treatment of scattering balsa seeds, transplanting balsa seedlings, and a control treatment (without balsa). For each treatment, we applied three different bracken ... establishing the experiment regarding: Bracken fern rhizome biomass, balsa density, basal area, height, density, species richness of ... weeding frequencies. We also evaluated the importance of balsa and its regenerative attributes in controlling bracken fern ...
Tópico(s): Ecology and Vegetation Dynamics Studies
2015 - Multidisciplinary Digital Publishing Institute | Forests
Nathan Kotlarewski, Barbara Ozarska, Benson K. Gusamo,
... with the aim to determine thermal properties of balsa wood grown in plantations in Papua New Guinea. ... D5334 (2008).The mean thermal conductivity results of balsa were in the range of 0.0381 W/ ... used as insulators in the construction industry.A balsa sample with a density of 113 kg m ... across the tangential and radial wood grain directions.Balsa is exported from Papua New Guinea mostly as ... there is the opportunity for Papua New Guinea balsa processors to consider producing perpendicular-grain panels for ...
Tópico(s): Lignin and Wood Chemistry
2014 - North Carolina State University | BioResources
Sebastian Marian Zaharia, Cristin Olimpiu Morariu, Anișor Nedelcu, Mihai Alin Pop,
Balsa wood is a natural cellular material with an excellent resistance-to-weight ratio that is ideal ... carbon-fiber-reinforced polymer (CFRP) skin and a balsa wood core were tested with static and dynamic ... regime determined the mechanical characteristics of the CFRP-balsa specimens that were needed for subsequent fatigue strength ... on the Charpy impact response of the CFRP-balsa sandwich specimens. This study implemented an accelerated fatigue ... predict the mean fatigue life of the CFRP-balsa sandwich specimens subjected to cyclic fatigue via three- ...
Tópico(s): Textile materials and evaluations
2017 - North Carolina State University | BioResources
Renny Purnawati, Fauzi Febrianto, Nyoman J Wistara, Siti Nikmatin, Wahyu Hidayat, Seung Hwan Lee, Nam–Hun Kim,
... have a potential for development, including kapok and balsa fibers. The characteristics of both fibers were evaluated ... analyze some important fundamental properties of kapok and balsa fibers, including their dimensions, morphology, chemical components, and ... that the average fiber lengths for kapok and balsa were 1.63 and 1.30 cm, respectively. Kapok and balsa fibers had thin cell walls and large lumens ... lignin, and 2.34% wax content, whereas the balsa fiber was composed 44.62% α-cellulose, 16. ... 29% wax content. The characteristics of kapok and balsa fibers were examined by X-ray diffraction, Fourier- ...
Tópico(s): Advanced Cellulose Research Studies
2018 - The Korean Society of Wood Science Technology | Journal of the Korean Wood Science and Technology
Mertol Tüfekci, Vehbi Öztekin, İnci Pir, Murat Alioğlu, Can Dikicioğlu, Adnan Dikicioğlu, Ekrem Tüfekçi,
... the experimental assessment of the mechanical behaviour of balsa wood and its sandwich structures, where balsa serves as the core, supported by carbon fibre- ... characterisation is conducted on the mechanical behaviour of balsa wood and carbon fibre-epoxy balsa core sandwich structures subjected to a range of ... visual inspection of the internal structure of the balsa wood and the sandwich structures. Furthermore, the mechanical ... per minute. This research reveals key findings about balsa wood and its sandwich structures, highlighting their performance ...
Tópico(s): Textile materials and evaluations
2023 - Elsevier BV | Composites Part C Open Access
Daijun Zhou, Tao Yang, Wei Qian, Malcolm Xing, Gaoxing Luo,
... to prepare an eco-friendly dressing using a balsa-derived membrane with lysozymes designed for antibacterial purposes.The groups included controls, balsa (group A), translucent balsa (group B), translucent balsa-lysozymes (group C), and translucent balsa-modified lysozymes (group D). Physical and chemical methods ... B ≈ A > control (P<0.05).This translucent balsa-modified lysozyme dressing is characterized by strong antibacterial ...
Tópico(s): Silk-based biomaterials and applications
2018 - Dove Medical Press | International Journal of Nanomedicine
David C. Van Essen, J. L. Smith, Matthew F. Glasser, Jennifer Stine Elam, Chad J. Donahue, Donna Dierker, Erin Reid, Timothy S. Coalson, John Harwell,
We report on a new neuroimaging database, BALSA, that is a repository for extensively analyzed neuroimaging datasets from humans and nonhuman primates. BALSA is organized into two distinct sections. BALSA Reference is a curated repository of reference data ... derived spatial maps as well as brain connectivity. BALSA Studies is a repository of extensively analyzed neuroimaging ... published figures. Uploading and downloading of data to BALSA involves 'scene' files that replicate how datasets appear in Connectome Workbench visualization software. Altogether, BALSA offers efficient access to richly informative datasets that ...
Tópico(s): Neural dynamics and brain function
2016 - Elsevier BV | NeuroImage
Moslem Najafi, R. Ansari, A. Darvizeh,
Balsa cored sandwich structures with fiber-reinforced polymer (FRP) skins are widely used to produce lightweight, high- ... effective structural components used in marine applications. However, balsa is a hydrophilic material, which is severely susceptible ... penetration from the damaged FRP skins into the balsa cored sandwich structures can lead to the core ... a concept for improving the damage tolerance of balsa cored sandwich structures by replacing the FRP skins ... high-velocity impact test were carried out on balsa cored sandwich specimens made of FMLs. A traditional ...
Tópico(s): Composite Structure Analysis and Optimization
2018 - Springer Science+Business Media | Iranian Polymer Journal
Saman Sayahlatifi, Gholamhossein Rahimi, Alireza Bokaei,
... facings and two different types of core, including balsa wood core and hybrid corrugated composite/balsa core subjected to three-point bending, is investigated, ... and the hybrid core has been made of balsa wood with average density of 125 kg m − ... failure modes, a wood material behavior model for balsa and a combination of Hashin and Puck failure ... via VUMAT subroutines. It was found that combining balsa core with corrugated composite results in prevention of ...
Tópico(s): Natural Fiber Reinforced Composites
2019 - SAGE Publishing | Journal of Sandwich Structures & Materials
Rishabh Dagur, Daksh Singh, Shivam Bhateja, Vikas Rastogi,
... The results demonstrated core materials; RohaCell, DivinyCell, Airex, Balsa Wood; and facesheet materials; carbon/glass epoxy composite, ... price per unit volume are evaluated, which presented balsa wood with stiffer, light-weight and economical characteristics ... to capture bending and tensile test results on balsa carbon/balsa glass-epoxy composite. The investigation presented 35.19% ... based composite sandwich than glass-based. The carbon balsa sandwich composite absorbs 2.510 MJ/mm3 and ... energy in tensile and flexural actions than glass balsa sandwich composite. Conclusively, carbon balsa sandwich composite is ...
Tópico(s): Mechanical Failure Analysis and Simulation
2019 - Elsevier BV | Materials Today Proceedings
Chen Zhang, Ling‐Hua Xu, Cheng‐Ye Ma, Han-Min Wang, Yuanyuan Zhao, Yuying Wu, Jia‐Long Wen,
... lignin (DEL) was isolated from different tree-age balsa tree to understand the structural variations of lignin macromolecules during the growth of balsa for the first time. Confocal Raman microscopy (CRM) ... these DELs isolated from 3 and 5-year balsa are gradually disappeared. Considering the increasing molecular weight ... age, it was concluded that lignin macromolecules in balsa wood was gradually polymerized with the increasing growth ... in the DELs from 3 and 5-years balsa wood suggested that these feedstocks are promising feedstock ...
Tópico(s): Plant Gene Expression Analysis
2020 - Frontiers Media | Frontiers in Energy Research
Joel Galos, Raj Das, M.P.F. Sutcliffe, Adrian P. Mouritz,
... environmentally sustainable materials have created new opportunities for balsa wood (Ochroma pyramidale) to replace non-renewable, petroleum- ... and in-service performance of sandwich structures with balsa wood cores. The benefits of balsa wood in sandwich structure construction are reviewed, including ... and thermal insulation properties. The potential challenges of balsa cores in sandwich structures are also evaluated, including ... mechanisms responsible for the benefits and limitations of balsa core sandwich structures are reviewed. Topics for further ...
Tópico(s): Cellular and Composite Structures
2022 - Elsevier BV | Materials & Design
Abstract Balsa ( Ochroma pyramidale ), which is the lowest density wood, is a useful species in various industries. In general, balsa can be divided into three types (low density: ... study, we classified the porosities of the three balsa types into through-pore porosity, blind-pore porosity, ... porosity. As a result, the total porosity of balsa showed a high positive (+) correlation with closed-pore porosity, but total porosity of balsa showed negative (−) correlations with blind-pore porosity and ... porosity. Such information can be useful when using balsa as a natural porous material.
Tópico(s): Natural Fiber Reinforced Composites
2022 - Springer Science+Business Media | Journal of Wood Science
Jack Roberts, M.P. Boyle, Paul D. Wienhold, Gregory J. White,
... 27 cm (0.5 in.) core of either balsa or linear poly(vinyl chloride) (PVC) foam, were ... cases. For all six sandwich panels tested using balsa core, the type of failure was easily identified ... or no face sheet delamination. In the failed balsa core panels there was little or no evidence of balsa remaining on the FRP face sheet, however, in ... were not as high as those for the balsa core panels, PVC foam core bonding to the FRP face sheets was superior to balsa core bonding.
Tópico(s): Composite Structure Analysis and Optimization
2002 - Elsevier BV | Composites Part B Engineering
Kunigal Shivakumar, Steven A. Smith,
... molding (VARTM). The core materials were PVC or balsa of different densities. All of the core materials ... within the core. The crack growth in the balsa-cored panels was significantly different than that of ... in the foam panels. The cracks in the balsa panels grew in one of the three distinct ... The fracture toughness of the sandwich specimens with balsa-core materials ranged from 693 to 1008 J/m 2 . The results from the balsa-cored panels were compared to results obtained from similar balsa-cored sandwich materials using the Single Cantilever Beam ( ...
Tópico(s): Structural Analysis of Composite Materials
2004 - SAGE Publishing | Journal of Composite Materials
Michael Osei-Antwi, Julia de Castro, Thomas Keller,
... fiber-reinforced polymer (GFRP) bridge concepts involving GFRP- balsa sandwich plates are discussed. The sandwich plates were ... approximately 19 m can be reached with FRP-balsa sandwich slab bridges, if a carbon-FRP (CFRP) arch is integrated into the balsa core. Above this limit, hybrid sandwich-steel girder ... requires timber and steel plate inserts into the balsa core above the steel girders. GFRP-balsa sandwich slabs or decks exhibit full composite action ...
Tópico(s): Structural Load-Bearing Analysis
2014 - | Report
Michael Osei-Antwi, Julia de Castro, Anastasios P. Vassilopoulos, Thomas Keller,
Fracture in the complex balsa cores of fiber-reinforced polymer (FRP) sandwich beams was analyzed. The cores were composed of high- and low-density balsa layers separated by a circular adhesive interface or FRP arch. The balsa layers were cut from panels which consisted of balsa blocks adhesively bonded together. Failure in the beams was initiated by cracks propagating through the balsa core thickness. The crack locations could be predicted ...
Tópico(s): Concrete Corrosion and Durability
2014 - Elsevier BV | Construction and Building Materials
M.P Boyle, Jack Roberts, Paul D. Wienhold, Gang Bao, Gregory J. White,
... buckling in uniaxial compression. The panels, with either balsa or linear PVC foam cores, were tested in ... 1.3 were 400 kN (90 klb) for balsa core panels and 267 kN (60 klb) for foam core panels. For balsa and foam core panels with an aspect ratio ... kN (54 klb), respectively. Experimental buckling results for balsa core panels of both sizes differed by 5– ... between 15% and 23%. Post-buckling collapse of balsa and foam core panels with an aspect ratio ... klb) and 347 kN (78 klb), respectively. For balsa and foam core panels with an aspect ratio ...
Tópico(s): Mechanical Behavior of Composites
2001 - Elsevier BV | Composite Structures
... of sandwich composites. Three core materials were selected: Balsa wood, PVC foam, and Ayous wood. The facesheets ... sandwich composites were produced by woven carbon/epoxy. Balsa and PVC foam are widely used in sandwich ... Ayous wood, which is the lightest tree after Balsa, was used as core material in addition to ... sandwich composites possess a higher perforation threshold than Balsa and PVC foam sandwich composites. The perforation threshold of Balsa, PVC foam, and Ayous sandwich composites are 85, ... PVC sandwich composite and about two times than Balsa sandwich composite.
Tópico(s): Mechanical Behavior of Composites
2020 - SAGE Publishing | Journal of Sandwich Structures & Materials