1,720,981 research outputs found
The Influence of Bamboo Species and Immersion Treatment on the Quality of Oriented Strand Board
No full textBamboo is a viable choice for particle board manufacturing due to its robust mechanical strength. This research aims to analyze the physical and mechanical properties of Oriented Strand Board (OSB) made from three types of bamboo: belangke bamboo (Gigantochloa pruriens), betung bamboo (Dendrocalamus asper), and black bamboo (Gigantochloa atroviolacea). The bamboo samples will be subjected to three different treatments: soaking in water for 24 hours, autoclaving at a temperature of 120ºC for 1 hour, and a control group. The Oriented Strand Board (OSB) was manufactured with precise dimensions of 20 cm x 20 cm x 1 cm (Length x Width x Thickness). It was assembled using H3M isocyanate adhesive and underwent a conditioning process for a duration of 14 days. The physical properties of Oriented Strand Board were tested and the following values were determined: density ranged from 0.60-0.73 g/cm3, water content ranged from 5.36-8.12%, water absorption ranged from 31.6-45.82%, thickness expansion ranged from 5.11-16.27%, MOE ranged from 27,992 – 73,249 kgf/cm2, MOR ranged from 314 – 600 kgf/cm2, and IB ranged from 2.80-4.76 kgf/cm2. The term "physical and mechanical properties testing" pertains to the standard JIS A 5908:2003 and CSA 0437.0:2011.53 PagesSkripsi Sarjan
L.) wood
No full textThe primary aim of this research was to investigate and evaluate the effects of thermo-vacuum modification through forced convection on selected chemical, physical, and mechanical characteristics of Siberian larch (Larix sibirica L.) wood. Larch wood boards were thermally-modified, using press-vacuum plant technology, for three hours at a temperature of 200 °C and a pressure of 350 mBar. In order to characterise the thermally-modified (TH) and unmodified (CTRL) wood samples, the extractives, lignin and holocellulose content, volumetric swellings, compression strength, and modulus of elasticity (MOE) were determined. Gas chromatographic-mass spectrometric (GC-MS) analysis revealed chemical compound changes as a result of the thermal modification process where some extractives became undetectable after treatment while some new extractives were detected. Thermally-modified larch wood exhibited lower volumetric swelling compared to the untreated samples. Markedly, thermally-modified larch wood had lower tendency to absorb moisture. In addition, thermally-treated wood had slightly higher compression strength parallel to the grain, which was 0.29% higher than that of unmodified samples. Meanwhile, a 7.6% reduction in MOE was recorded in the thermally-treated wood
Adhesion performance of furfurylated plywood bonded with polyurethane and epoxy adhesives
No full textIPB Universit
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Nanofluid thermosetting adhesives for bonding forest-based lignocellulosic materials: A Brief Review of Synthesis, characterization, and applications
Full text linkvarious industries, including electrical microchannels, engines, spacecraft,nuclear, and solar energy. Nanofluids are created by floating small nanoparticlesin base fluids such as water or ethylene glycol, with or without stabilizingmethods. The typical size of nanoparticles is less than 100 nm2. Nanofluidthermosetting adhesives have the advantages of enhanced bonding strength,improved thermal conductivity, and reduced curing time. These qualities mightimprove the performance of thermosetting adhesives, which harden or set whenheated. However, the creation of such adhesives would necessitate variousdisadvantages, such as high cost of production and potential health andenvironmental risks. Understanding the physicochemical mechanism of usingnanofluids in the adhesive would be critical. This would include examining theeffects of particle size, shape, surfactant, temperature, etc. on thermalconductivity. While developing nanofluid thermosetting adhesives offers greatopportunities, it also requires overcoming several technical hurdles. Further studyin this area may lead to the creation of adhesives with improved thermal andadhesive qualities. Applications of nanofluid adhesives might cover a broad areaof the wood industry, particularly furniture manufacturing and wooden flooring.This study reviewed possible methods of synthesizing, characterization, andapplications of nanofluid thermosetting adhesives for wood-based composites
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Effects of particles moisture, conditioning environment, and heat treatment on the formaldehyde emission of urea formaldehyde-bonded particleboard
Full text linkThe initial moisture content (MC) and conditioning environment are among the most important factors that affect the properties as well as formaldehyde emission of particleboard. In this study, a three-layer rubberwood particleboard bonded with urea formaldehyde (UF) resin was prepared. Fine and coarse rubberwood particles with initial MC (of 3, 5, 7, 9 and 11%), respectively, were used to fabricate the three-layer particleboard. The produced particleboard was then evaluated for physical and mechanical properties. It was found that particleboard made with particles with 9% MC had the best properties. In the next phase of the study, this particleboard was chosen and exposed to different conditioning environments. The selected conditioning temperatures were 20 and 30 °C while the relative humidity was 30%, 65% and 100%. The findings suggested that the formaldehyde emission of particleboard increased with increasing conditioning temperature and relative humidity. However, the effect of the previous conditioning was nullified after the samples were re-equilibrated in a setting that served as the control. In order to reduce the formaldehyde emission of the particleboard, the samples were subjected to thermal treatment at 130, 150, 170 and 190 °C. It was found that the formaldehyde emission varied with treatment temperatures. Particleboard with the Super E0 level (≤ 0.3 mg/L) was successfully achieved by samples that were treated at 170 °C
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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