1,720,958 research outputs found
DEVELOPMENT OF WOODCERAMICS FROM TROPICAL FLORA
Full text linkWoodceramics are porous carbon or hybrid materials derived from woody materials impregnated with thermosetting resin and vacuum-carbonized at high temperatures. Woodceramics have become commercially valuable due to their applications in heaters, gas filters, absorbents, and humidity and temperature sensors. Hence, this study aimed to determine the suitable conditions for producing woodceramics from various materials and to evaluate their potential applications. The specific surface area (SSA), pore volume, pore diameter, and adsorption isotherm of woodceramics made from bamboo, pine, eucalyptus, rubberwood, and oil palm shell particleboards were obtained using the Brunauer–Emmett–Teller (BET) method. The average pore diameter was classified as mesoporous (2–50 nm). The SSA and adsorption isotherm results of the woodceramics made from eucalyptus indicated that this species can be used as activated charcoal, and its volume electrical resistivity was similar to that of a semiconductor. When carbonized at maximum temperatures of 800 °C and 1,000 °C, the electromagnetic shielding effectiveness (ESE) of the woodceramics ranged from approximately 20–60 dB within a frequency range of 800–2,200 MHz. This ESE value was higher than those of materials woven from boron carbon fiber, carbon boron, and stainless steel fiber-filled thermoplastics. Moreover, the production cost of woodceramics was lower compared to commercial alternatives
The Comparison of Wood Utilization: Case Study of Phrae Province
Full text linkThe objectives of this study were (1) to study the of wood utilization in households sample and (2) to compare the wood utilization two communities. By using questionnaires as a tool to collect data found that there is a different of wood utilization between this two areas which mostly the use of wood farm or plantation in Mae Sai sub-district, Rong Kwang district is for house structure and inferior cooking in the household or agricultural implements. Hence the use of wood utilization in Mae Sai sub-district, Rong Kwang district is nonsignificant. However wood utilization in Wiang Thong sub-district, Sung Men district, wood is mainly brought from plantations which is teak from individual woodlands and wood from Forest Industry Organization. It is subsequently for wood productions, sawn wood, sawmill and wood products, old wooden house and logs. There a significant at 0.05. Mae Sai sub-district, RongKwang district have more utilization of wood in households than commercial and lack of knowledge and understanding in the use of wood in various forms. Therefore want to have the training to promote knowledge in this area. This is different in Wiang Thong sub-district, Sung Men district has more commercial utilization of wood than household both produced for household use and manufactured focus on the commercial occupation
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
People’s Attitude and Perception of Forest Laws Regarding Land Use Policy in Phu Pha Man National Park
Full text linkThis research aimed to determine the levels of attitude and perception on forest laws regarding land use policy in Phu Pha Man National Park as well as to investigate the factors affecting attitudes and perceptions on forest laws of people who had land use rights in Phu Pha Man National Park. An interview form was used as an instrument for collecting data from the sample group consisted of 315 people who have land ownership in Phu Pha Man National Park under section 64, National Park Act B.E. 2562 (2019). The obtained data were analyzed by using descriptive statistics. The results showed that most of the respondents were male, aged 41-50 years old, finished the primary level education, and made their livelihoods as gardeners. Each household earned less than 10,000 baht per month, with land ownership of 5.1-10 rai. Their perception of forest laws information was at a moderate level. Their attitudes towards forest laws were at a high level whereas their perception of forest laws was at a moderate level. The study also revealed that age, education level, main occupation, monthly income, land ownership, and land use pattern were factors that affected different levels of people’s perception of forest laws. Moreover, it was found that people’s perception of forest laws information had a significant correlation (p<0.05) with a level of people’s perception of forest laws. These research findings will be applied as a guideline for Phu Pha Man National Park as well as relevant agencies in providing information about forest laws to people in order to reduce the problem of the encroachment into national park in the future
Using the Maximum Entropy Modeling to assess the habitat suitability of natural Teak (Tectona grandis Linn.f.) in Mae Hong Son Province
Full text linkTeak (Tectona grandis Linn.f.) is the most valuable commercial woods which had low distributed in the nature. The objective of this research aimed to assess habitat suitability of natural Teak in Mae Hong Son province based on some bioclimate and physical environmental factors related to its distribution higher than 700 m asl. The GPS coordinates of the 20 sites where Teak is presented were used for suitability analysis based on Maximum Entropy Modeling (MaxEnt).
The results showed that the area under the curve (AUC) of natural Teak was 0.917. Indicating MaxEnt result is high effective for predicting the suitable habitat. Environmental factors that determined the natural Teak distribution were slope, highest monthly precipitation in the driest month, and the highest annual mean precipitation. As a result, the suitability habitat of Teak can be divided as Least suitable, Low suitable, Medium suitable and High suitable at 62.12, 19.80, 9.59 and 8.49 %, respectively. High habitat suitability was found in Pang Mapha District, Pai District, Mueang District and Khun Yuam District.This finding can be applied in the Teak restoration management plan in these areas to increase the teak population in nature, in addition, the protected plan also can be promoted with high capacity management
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
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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