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1.
Flame retardancy,antifungal efficacies,and physical–mechanical properties for wood/polymer composites containing zinc borate
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Tanakit Chan‐Hom Weawboon Yamsaengsung Benjaphorn Prapagdee Teerasak Markpin Narongrit Sombatsompop 《火与材料》2017,41(6):675-687
This work aimed to examine flame retardancy, antifungal performance and physical–mechanical properties for silane‐treated wood–polymer composites (WPCs) containing zinc borate (ZnB). ZnB with content from 0.0 to 7.0 wt% was added to WPCs, and silane‐treated wood contents were varied. The polymers used were poly(vinyl chloride) (PVC) and high‐density polyethylene (HDPE). The decay test was performed according to the European standard EN 113. Loweporus sp., a white‐rot fungus, was used for antifungal performance evaluation. Antifungal performance was observed to decrease with wood content. Incorporation of ZnB at 1.0 wt% significantly increased the antifungal performance of WPCs. ZnB content of greater than 1.0 wt% lowered the antifungal properties of WPCs. The results suggested that the wood/PVC composite exhibited better antifungal performance than the wood/HDPE composite. The addition of wood flour to PVC and HDPE decreased flame retardancy, whereas the incorporation of ZnB retained the flame retardancy. ZnB was found to be more appropriate for wood/PVC than wood/HDPE as a result of hydrogen chloride generated from the dehydrochlorination reaction of PVC. The results indicated that the addition of ZnB did not affect the physical‐mechanical properties of neat polymers and the composites. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
2.
T. Buranathiti N. Premkamolnetr T. Markpin P. Ratchatahirun W. Yochai N. Sombatsompop 《Scientometrics》2009,78(1):13-21
This article introduced two sampling methods, including Directly Random Sampling (DRS) and Redistributed Random Sampling (RRS)
methods for categorization of a large number of research articles retrieved from metallurgy and polymer subfields from the
Science Citation Index (SCI) database. The accuracy of the proposed sampling methods was considered in association by comparing
with reference results previously obtained by Fully Retrieving Sampling (FRS) method, which involved analyzing the contents
and categories of all articles from the database. The results suggested that RRS and DRS methods were appropriate, efficient
and reasonably accurate for categorization of relatively large volume of research articles. RRS method was highly recommended,
especially when the contents of sample articles was unevenly distributed. By DRS and RRS methods, only about 6.3% of total
articles were required for obtaining similar results as those given by FRS method. The percentage Expected Worst Errors (EWE)
from DRS and RRS methods were observed to range from 1.0 to 5.5%. The EWE value could be reduced by increasing the sample
size. 相似文献
3.
Summary The research performance of Thai researchers in various subject categories was evaluated using a new mathematical index entitled
“Impact Factor Point Average” (IFPA), by considering the number of published papers in journals listed in the Science Citation
Index (SCI) database held by the Institute for Scientific Information (ISI) for the years 1998-2002, and the results compared
with the direct publication number (PN) and publication credit (PC) methods. The results suggested that the PN and PC indicators
cannot be used for comparison between fields or countries because of the strong field-dependence. The IFPA index, based on
a normalization of differences in impact factors, rankings, and number of journal titles in different subject categories,
was found to be simple and could be used with equality for accurate assessment of the quality of research work in different
subject categories. The results of research performance were found to be dependent on the method used for the evaluations.
All evaluation methods indicated that Clinical Medicine was ranked first in terms of the research performance of Thai scholars
listed in the SCI database, but exhibited the lowest improvement of performance. Chemistry was shown to be the most improved
subject category. 相似文献
4.
宝石业是泰国的重要产业之一,但大多数宝石并不完美且带有缺陷,常采用玻璃填充的方法来处理。但该方法填充的宝石含有有毒重金属,因此急需开发新的宝石改性技术。离子束是近来发展起来的新技术,可以用来处理玻璃填充的宝石并可以去除其含有的有毒金属。文中采用泰国本地的玻璃填充红宝石样品先经80 kV加速的氮离子束注入至1017 ions/cm2剂量,然后分别在泰国清迈和中国武汉用2 MeV和1.7 MeV的质子束做弹性背散射光谱分析。研究了离子束处理前后,玻璃填充宝石的金属杂质、含量及其分布。两地的分析结果互相印证、共同揭示了宝石中主要的有毒金属是铅,铅的浓度经离子束处理后约为0.15%,比离子束处理前降低了20倍,且铅在宝石中的分布是均匀的。结果表明:离子束是一种有效的处理玻璃填充宝石的方法。 相似文献
5.
In this study, we investigated the effects of untreated precipitated silica (PSi) and fly ash silica (FASi) as fillers on the properties of natural rubber (NR) and styrene–butadiene rubber (SBR) compounds. The cure characteristics and the final properties of the NR and SBR compounds were considered separately and comparatively with regard to the effect of the loading of the fillers, which ranged from 0 to 80 phr. In the NR system, the cure time and minimum and maximum torques of the NR compounds progressively increased at PSi loadings of 30–75 phr. A relatively low cure time and low viscosity of the NR compounds were achieved throughout the FASi loadings used. The vulcanizate properties of the FASi‐filled vulcanizates appeared to be very similar to those of the PSi‐filled vulcanizates at silica contents of 0–30 phr. Above these concentrations, the properties of the PSi‐filled vulcanizates improved, whereas those of the FASi‐filled compounds remained the same. In the SBR system, the changing trends of all of the properties of the filled SBR vulcanizates were very similar to those of the filled NR vulcanizates, except for the tensile and tear strengths. For a given rubber matrix and silica content, the discrepancies in the results between PSi and FASi were associated with filler–filler interactions, filler particle size, and the amount of nonrubber in the vulcanizates. With the effect of the FASi particles on the mechanical properties of the NR and SBR vulcanizates considered, we recommend fly ash particles as a filler in NR at silica concentrations of 0–30 phr but not in SBR systems, except when improvement in the tensile and tear properties is required. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 2119–2130, 2004 相似文献
6.
Narongrit Sombatsompop Apisit Kositchaiyong Teerasak Markpin Sekson Inrit 《Scientometrics》2006,66(3):521-535
Summary Quantitative and qualitative scientific evaluations of the research performance of Thai researchers were carried out with
regards to their international publications and citations in four different subject categories; namely Clinical Medicine,
Chemistry, Material Sciences, and Engineering. This work used citations to publications of Thai researchers in the Science
Citation Index (SCI) database during 1998-2002 as a data source. The calculations and comparisons of article impact factors
(AIF), position impact factors (PIF) and journal impact factors (JIF) were attempted for quantitative evaluation.The positions
and significance levels (cited contents) of the citations were considered for qualitative assessment.For quantitative evaluation,
the highest article quantity and number of times cited were given by Thai researchers in Clinical Medicine, the lowest being
for Material Sciences. Clinical Medicine had the highest AIF value, while Engineering exhibited the lowest. Each article by
Thai researchers was found to be cited more than once within a citing article, especially articles in Clinical Medicine. For
qualitative assessment, most articles from Thai scholars were cited in Introduction and Results & Discussion sections of the
citing articles. Only non-Thai researchers in Clinical Medicine preferred to use Discussion from Thais' articles for discussion
of their work whereas those in Chemistry, Material Sciences and Engineering were referred as general references. Less than
1.5% of research works of Thai scholars were cited as “the pioneer”for the research communities of the subject categories
of interest. 相似文献
7.
Supreeda Jeamtrakull Apisit Kositchaiyong Teerasak Markpin Vichai Rosarpitak Narongrit Sombatsompop 《Composites Part B》2012,43(7):2721-2729
In flooring applications, experimental data and insight from scientific investigations on wear properties of wood/polymer composites (WPCs) are important for engineers to understand how to design and formulate WPC materials with high resistance to wear. In this work, three different types of wood flour – namely Xylia kerrii Craib & Hutch., Hevea brasiliensis Linn., and Mangifera indica Linn. – were utilized and incorporated into poly(vinyl chloride) (PVC) with a fixed content (10 phr) of E-chopped strand glass fiber. The physical, mechanical and wear properties, in terms of specific wear rate, were then assessed as a function of wood content and sliding distance. The experimental results suggested that the addition of wood flour increased the flexural modulus and strength up to 40 phr; beyond this concentration, the flexural properties decreased. Hardness was not affected by the addition of wood flour. The mechanical and wear properties of WPVC composites were found to improve with the addition of the E-glass fiber. Xylia kerrii Craib & Hutch. wood exhibited the lowest specific wear rate for non-reinforced WPVC composites, whereas Hevea brasiliensis Linn. wood showed the lowest specific wear rate for the glass fiber reinforced WPVC composites. The longer the sliding distance, the greater the specific wear rate in all cases. 相似文献
8.
This article introduces a new modified method for calculating the impact factor of journals based on the current ISI practice
in generating journal impact factor values. The impact factor value for a journal calculated by the proposed method, the so-called
Cited Half-Life Impact Factor (CHAL) method, which is based on the ratio of the number of current year citations of articles
from the previous X years to that of articles published in the previous X years, the X value being equal to the value of the
cited half-life of the journal in the current year. Thirty-four journals in the Polymer Science Category from the ISI Subject
Heading Categories were selected and examined. Total citations, impact factors and cited half-life of the 34 journals during
the last five years (1997-2001) were retrieved from the ISI Journal Citation Reports and were used as the data source for the calculations in this work, the impact factor values from ISI and CHAL methods then
being compared. The positions of the journals ranked by impact factors obtained from the ISI method were different from those
from the CHAL method. It was concluded that the CHAL method was more suitable for calculating the impact factor of the journals
than the existing ISI method.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
9.
T. Markpin B. Boonradsamee K. Ruksinsut W. Yochai N. Premkamolnetr P. Ratchatahirun N. Sombatsompop 《Scientometrics》2008,75(2):251-261
This article proposed a new index, so-called “Article-Count Impact Factor” (ACIF) for evaluating journal quality in light
of citation behaviour in comparison with the ISI journal impact factors. The ACIF index was the ratio of the number of articles
that were cited in the current year to the source items published in that journal during the previous two years. In this work,
we used 171 journal titles in materials categories published in the years of 2001–2004 in international journals indexed in
the Science Citation Index Expanded (SCI) database as data source. It was found that ACIF index could be used as an alternative
tool in assessing the journal quality, particularly in the case where the assessed journals had the same (equal or similar)
JIF values. The experimental results suggested that the higher the ACIF value, the more the number of articles being cited.
The changes in ACIF values were more dependent on the JIF values rather than the total number of articles. Polymer Science
had the greatest ACIF values, suggesting that the articles in Polymer Science had greater “citation per article” than those in Metallurgical Engineering and Ceramics. It was also suggested that in order to increase a JIF value of 1.000,
Ceramics category required more articles to be cited as compared to Metallurgical Engineering and Polymer Science categories. 相似文献
10.
Teerasak Lee Henry Kennedy Rares Bodnar William Redman-White 《Analog Integrated Circuits and Signal Processing》2017,92(3):355-367
A low voltage start-up energy harvesting medium frequency receiver is presented, for use as the power and synchronisation part of a remote sensor node in a wide area industrial or agricultural application. The use of embedded low bandwidth network synchronisation data permits very low operational duty cycle without the need for real time clocks or wake up receivers at each node with their associated continuous power drain. The receiver consists of a rectifier, a power management unit and a phase-shift keying demodulator. The rectifier is optimised for low start-up and operating voltage rather than power efficiency. With standard MOS thresholds the rectifier can cold start with only 250 mV peak antenna input, and useful battery charging is delivered with 330 mV peak input. The QPSK demodulator consumes 1.27 μW with a supply voltage of 630 mV at a data rate of 1.6 kbps with 1 MHz carrier frequency. The IC is implemented in a standard threshold 0.18 μm CMOS technology, occupies 0.54 mm2 and can deliver 10.3 μW at 3 V to an external battery or capacitor. 相似文献