Chandrakasem Rajabhat University is a tertiary educational institution in the north of Bangkok, Thailand. It offers a post-diploma certificate and degree level education from the bachelor's degree to master's degree, with a Ph.D offered in several majors.Founded in 1940, Chandrakasem was Thailand's first training college for secondary school teachers. In 1991 Chandrakasem Teachers College was named an outstanding tertiary educational institute by the Ministry of Education. The following year, His Majesty King Bhumibol Adulyadej bestowed the name Chandrakasem Rajabhat Institute on the former college.On 14 June 2004, all Rajabhat institutes nationwide were upgraded by His Majesty the King, who signed the Rajabhat University Act of B.E 2547 , which was announced in the Royal Gazette for implementation from 15 June 2004. This raised all Rajabhat institutes to Rajabhat universities, creating a close-knit group of Thai universities dedicated to preserving the Thai heritage and subject to the National Tertiary Education Commission of the Ministry of Education. Wikipedia.
Srakaew V.,Chandrakasem Rajabhat University |
Tachaboonyakiat W.,Chulalongkorn University
Journal of Molecular Structure | Year: 2017
Two parthenolide derivatives (PDs) were synthesized by chemical modification of parthenolide with concentrated hydrochloric acid and to evaluate their cytotoxicity to Hep-G2 cells in terms of their active functional groups and polarity. The chemical structures of the PDs were characterized by Fourier transform infrared, nuclear magnetic resonance and high resolution mass spectroscopy. Two PDs (PD1 and PD2) were fractionated by silica gel column chromatography with a Rf of 0.37 and 0.19, respectively, in a 1:1 (v/v) hexane: ethyl acetate mobile phase, indicating that PD1 was less polar than PD2. Compared to the parent parthenolide, both PD1 and PD2 had lost the active carbon-carbon double bond and epoxide functional groups, but retained the active 14-methyl and α-methylene-γ-butyrolactone groups. Although PD1 and PD2 possessed similar functional groups, they differed in their structural arrangement and consequentially their polarity. PD1 and PD2 exhibited an in vitro IC50 against the Hep-G2 cell line of 41.0 and 94.0 μg/ml, respectively, which was weaker than that for parthenolide (<1 μg/ml). Thus, the ranked polarity of PD2 > PD1 > parthenolide was inversely related to their cytotoxicity against the Hep-G2 cell line (parthenolide > PD1 > PD2). The obtained PDs may be potential novel anticancer substances. © 2017 Elsevier B.V.
Chimalawong P.,Chandrakasem Rajabhat University |
Kirdsiri K.,Nakhon Pathom Rajabhat University |
Kaewkhao J.,Nakhon Pathom Rajabhat University |
Limsuwan P.,King Mongkut's University of Technology Thonburi
Procedia Engineering | Year: 2012
Soda-lime-silicate glasses with the compositions of (65-x)SiO 2-25Na2O-10CaO-xDy2O3 (where x = 0.0, 0.10, 0.30, 0.50 and 1.00 mol % ) were prepared by melt-quenching technique and characterized. The density (ρ) and molar volume (VM) obtained were found to increase with increasing Dy2O3 content. Such behaviour was accounted for by the differences between atomic weight and the atomic radii of the Si and Dy ions. The rare-earth ion concentration (N) and ionic radius (rp) were calculated. The absorption spectra of Dy3+ doped soda-lime-silicate glass correspond with several bands, which are assigned from the ground state, 6H 15/2 to 4I13/2, 4F7/2(389 nm), 4I15/2 (453 nm), 6F3/2 (744 nm), 6F5/2 (797 nm), 6F7/2(892 nm), (6H7/2, 6F9/2)(1082 nm), ( 6F11/2, 6H9/2)(1266 nm), and 6H11/2 (1649 nm). The refractive index of glasses was increased with the increasing of Dy2O3 concentration. © 2010 Published by Elsevier Ltd.
Purahong W.,Chandrakasem Rajabhat University |
Purahong W.,University of Bologna |
Hyde K.D.,Mae Fah Luang University |
Hyde K.D.,King Saud University
Fungal Diversity | Year: 2011
The influence of clavicipitaceous fungal endophytes on grass decomposition rates has been studied through field and laboratory experiments. However, the effects of endophytes on decomposition rates of non-grass species are unclear. This paper reviews research data related to the effects of fungal endophytes on decomposition rates of three litter types: grass, non-grass leaf litter (including spruce needle litter) and non-grass twigs and wood. We discuss how fungal endophytes are involved in, or regulate decomposition rates and may change lifestyles from fungal endophytes to saprotrophs. Classical morphology and molecular approaches together with digestion enzyme studies provide evidence to suggest that some endophyte species switch their ecological roles and adopt a new life style as saprotrophs. We also explore the main mechanisms that explain how fungal endophytes may decelerate decomposition rates and whether it is directly driven by alkaloids. Further research on the role of fungal endophytes in decomposition rates of both grass and non-grass litter is needed, especially those addressing the direct and indirect mechanisms by which endophytes affect decomposition rates. © Kevin D. Hyde 2010.
Chokchaisiri R.,Ramkhamhaeng University |
Innok P.,Chandrakasem Rajabhat University |
Suksamrarn A.,Ramkhamhaeng University
Phytochemistry Letters | Year: 2012
Four new flavonoid glycosides, curcucomosides A-D (1-4), three known flavonoid glycosides, 5-7, and four known diarylheptanoids, 8-11, were isolated from the ethanol extract of the aerial parts of Curcuma comosa. The structures of the new compounds were established as rhamnazin 3-O-α-l- arabinopyranoside (1), rhamnocitrin 3-O-α-l-arabinopyranoside (2), rhamnazin 3-O-α-l-rhamnopyranosyl-(1→2)-O-α-l-arabinopyranoside (3), and rhamnocitrin 3-O-α-l-rhamnopyranosyl-(1→2)-O-α-l- arabinopyranoside (4) by spectroscopic analysis and chemical reactions whereas those of the known compounds were identified by spectral comparison with those of the reported values. © 2012 Phytochemical Society of Europe. Published by Elsevier B.V. All rights reserved.
Chindaprasirt P.,Khon Kaen University |
Rattanasak U.,Burapha University |
Vongvoradit P.,Burapha University |
Jenjirapanya S.,Chandrakasem Rajabhat University
International Journal of Minerals, Metallurgy and Materials | Year: 2012
The Al-rich waste with aluminium and hydrocarbon as the major contaminant is generated at the wastewater treatment unit of a polymer processing plant. In this research, the heat treatment of this Al-rich waste and its use to adjust the silica/alumina ratio of the high calcium fly ash geopolymer were studied. To recycle the raw Al-rich waste, the waste was dried at 110°C and calcined at 400 to 1000°C. Mineralogical analyses were conducted using X-ray diffraction (XRD) to study the phase change. The increase in calcination temperature to 600, 800, and 1000°C resulted in the phase transformation. The more active alumina phase of active θ-Al 2O 3 was obtained with the increase in calcination temperature. The calcined Al-rich waste was then used as an additive to the fly ash geopolymer by mixing with high calcium fly ash, water glass, 10 M sodium hydroxide (NaOH), and sand. Test results indicated that the calcined Al-rich waste could be used as an aluminium source to adjust the silica/alumina ratio and the strength of geopolymeric materials. The fly ash geopolymer mortar with 2.5wt% of the Al-rich waste calcined at 1000°C possessed the 7-d compressive strength of 34.2 MPa. © 2012 University of Science and Technology Beijing and Springer-Verlag Berlin Heidelberg.
Chindaprasirt P.,Khon Kaen University |
Jenjirapanya S.,Chandrakasem Rajabhat University |
Rattanasak U.,Burapha University
Construction and Building Materials | Year: 2014
Fluidized bed combustion (FBC) is a well-established coal burning process for small factories owing to energy efficiency and low environmental impact. Due to the low burning temperatures at 800-900 °C, FBC fly ash is not suitable for use as pozzolan in concrete mixture and requires proper improvement before utilization. This research proposed the use of FBC fly ash as a source material for geopolymeric composite. Grinding was applied to improve the physical property of FBC fly ash. In addition, the ground FBC fly ash was blended with pulverized coal combustion (PCC) high calcium fly ash to increase its glassy phase. The geopolymeric composites were then prepared using the blended powder mixed with alkali solutions, and thermally-cured to promote the reaction. The hardened specimens were subjected to chemical and physical tests. Resistance to acid and salt attacks of PCC/FBC fly ash composites was also investigated. Results showed the changes in chemical compositions and physical performances of geopolymeric materials. PCC fly ash helped enhance the properties of FBC fly ash based composite and the dense and homogeneous matrix was achieved. Additional CSH was formed resulting in the increase in strength of composites as a function of time. However, the durability was affected with the use of the high calcium PCC fly ash due to the presence of calcium and the associated hydration products. © 2014 Elsevier Ltd. All rights reserved.
Chomcheon P.,Chandrakasem Rajabhat University |
Wiyakrutta S.,Mahidol University |
Aree T.,Chulalongkorn University |
Sriubolmas N.,Chulalongkorn University |
And 6 more authors.
Chemistry - A European Journal | Year: 2010
Five new hybrid peptide-polyketides, curvularides A-E (1-5), were isolated from the endophytic fungus Curvularia geniculata, which was obtained from the limbs of Catunaregam tomentosa. Structure elucidation for curvularides A-E (1-5) was accomplished by analysis of spectroscopic data, as well as by single-crystal X-ray crystallography. Curvularide B (2) exhibited antifungal activity against Candida albicans, and it also showed synergistic activity with a fluconazole drug. © 2010 Wiley-VCH Verlag GmbH & Co. KGaA. Weinheim.
Chitcharoen D.,Chandrakasem Rajabhat University |
Pattaraintakorn P.,University of York
2014 International Computer Science and Engineering Conference, ICSEC 2014 | Year: 2014
Decision analysis based on information flow distribution from a given data set can be accomplished using a rough set flow graph. A key property is that every branch of a flow graph can be interpreted as a decision rule with three associated coefficients. In order to see flow distribution of some specific attributes or values of any attribute, we introduce two new sub-flow graphs and corresponding formulas to calculate their coefficients. To demonstrate our new analysis techniques, we provide examples on social networks. © 2014 IEEE.
Ngowananchai J.,Chandrakasem Rajabhat University
Jurnal Teknologi (Sciences and Engineering) | Year: 2013
Most EFL teachers have the aims to improve their learners' ability of English specifically the speaking skill. However, the ability of learning skills is varied according to their background and the environment of target language surrounding them. To teach spoken English effectively, teachers need to pay much attention to the approach used in the lesson. The author therefore conducted a qualitative research to investigate the students' improvement in speaking competence shown when they are in different contexts i.e. classroom and outside classroom. The study also examined the significant differences in terms of performance of speaking ability in different contexts. The participants consisted of 72 students. Eighteen students were selected by simple random sampling through drawing lots. The sampling size is 25 percent of the population. The researcher carried out the experiment using Natural Occurring Conversation as a Teaching Model to improve the speaking competence of students. The duration of the implementation was 12 weeks excluding the mid-term and final examination. The results revealed that Natural Occurring Conversation as a teaching model helped students to have freedom and confidence when they spoke outside classroom context. However, some students still had difficulty in recognition of the questions when interviewing tourists. They always looked at and read the questions while having a conversation which showed no significant differences in terms of their performance in speaking ability in both in and outside classroom context. © 2013 Penerbit UTM Press. All rights reserved.
Laokietkul J.,Chandrakasem Rajabhat University
Journal of Next Generation Information Technology | Year: 2014
This study was to create course associative classification rules called CourseACRs to evaluate course equivalency for a credit transferring process by using the associative classification technique. The purpose of this study was to create course evaluation tools for evaluating course equivalency. This study used course transfer history records of students in three bachelor's degree programs at Chandrakasem Rajabhat Univeristy, Thailand-- Information Technology, Computer Science and Multimedia Technology-- as a training data set. The result of this study revealed that the CourseACRs performed at a good level of performance with an accuracy rate of 89.63% of the courses equivalency model for the university's credit transferring process. Finally, the research discovered that the CourseACRs can be a guideline for academic staff and students to evaluate course equivalency in the credit transferring process and to manage an appropriate study plan after the credit transferring process in the future as well.