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Preface - kmutt

Preface - kmutt

KMUTT Annual Research

KMUTT Annual Research Abstracts 2005 signal obtained from corrosion process of different types of stainless steel are dissimilar whereas those of the same type are alike. Count, rise time, amplitude, energy and duration time were chosen as the classification features for a Probabilistic Neural Network to classify the corrosion severity into one of five classes. The performance of the network is high. The number of correct prediction is higher than 92% for all classes of corrosion severity. Faculty of Science IJ-057 DS5: DIRECT-SEARCHER AUTOMATIC SYSTEM VERSION 5 FOR SMALL MOLECULES RUNNING ON WINDOWS PERSONAL COMPUTERS Kenji Okada, Ploenpit Boochathum Journal of Applied Crystallography, Vol. 38, Part 5, October 2005, pp. 842-846 DS5 (Direct-Searcher Automatic System Version 5), for the crystal structure analysis of small molecules on personal computers (PCs), is a new program that integrates more than 18 main programs, subroutines and mathematics/graphic libraries of the DS*SYSTEM4 package. Three features of note are: compatibility of input instruction data with the SHELX series, control of calculation sequences by subprogram names that are prepared by the user, and graphical output on the PC display with Postscript/HPGL files. All functions of DS5 are inherited from DS*SYSTEM4 .. IJ-058 PRELALS WORKBENCH: VISUAL DATA MANIPULATION WORKBENCH FOR WINLALS ON WINDOWS PCS Kenji Okada, Ploenpit Boochathum, Keiichi Noguchi, Kenji Okuyama, Yukiteru Katsube Journal of Computer Aided Chemistry, Vol. 6, 2005, pp. 12-22 PreLALS workbench is designed to aid users in the task of visualizing chemical structures using three-dimensional models, editing and the data manipulation for WinLALS program that refines the internal coordinates based on linked-atom least-squares (LALS) method for helical polymers. It combines the views of model building (MB), analyses, and data preparation tools with easy-to-use graphical user interfaces. We describe the outline of 21 the WinLALS program with mathematical expressions and explain the several functions of the PreLALS workbench using each menu of the data preparation and example dialogs. The PreLALS workbench runs on most IBM compatible Windows PCs having a minimum of Pentium and the operating system must be either Windows 2000, 98, Me or XP. IJ-059 ON UNIFORM OPIAL CONDITION, UNIFORM KADEC-KLEE PROPERTY IN MODULAR SPACES AND APPLICATION TO FIXED POINT THEORY Poom Kumam Journal of Interdisciplinary Mathematics, Vol. 8, No. 3, 2005, pp. 377-385 In this paper we define an uniform opial condition and uniform Kadec-klee property in sense of modular spaces. The main purpose of this paper is to extend the results of uniform opial condition and uniform Kadec-Klee property in Banach spaces to modular space X p . IJ-060 SURFACE MORPHOLOGY OF SUBMICRON CRYSTALS IN ALUMINUM NITRIDE FILMS GROWN BY DC MAGNETRON SPUTTERING Pichet Limsuwan, Nitinai Udomkan, Siwaporn Meejoo, Pongtip Winotai International Journal of Modern Physics B, Vol. 19, No. 12, 2005, pp. 2073-2083 Aluminium nitride (AlN) thin films were fabricated on a glass substrate by reactive magnetron sputtering. Raman microscopy was then employed to follow the characteristics of their optical and acoustic phonon modes. At the optimal sputtering time of 30 minutes, the defect-induced first and second order Raman spectra were observed in 400-800 cm -1 band which were mostly related to the coating compositions. However, at the 30-, 60- and 90- minute sputtering, crystals of submicron size order of AlN were achieved. This could be clearly identified by the presence of Raman peak at 658-662 cm -1 . Powder X-ray diffraction (PXRD) patterns revealed the development of (002) and (101) planes of hexagonal wurtzite AlN phase. The optimal average grain size measured by atomic force microscopy (AFM) is at 330 nm. It was found that the hardness was strongly dependent on roughness of the film, the International Journal

22 maximum of which was achieved at 20.00 GPa. The presence of F-type defects in AlN films was investigated by X-band (~9.44 GHz) ESR spectrometer at 295 K. The ESR experiments were carried out by applying magnetic field perpendicular to AlN film, which showed the ESR six-peak multiplet signal at ~290 mT arising from superhyperfine interactions between nuclear spin I = 5/2 of 27 Al and electron spins trapped in nitrogen vacancies. The ESR signals are simulated and the ESR parameters are calculated. The vacancies are clearly randomly distributed as the ESR signals are independent of rotation angle (φ) about the normal of the film. All these results were analyzed and presented as a function of the deposition parameters and composition, and crystalline phases existed in the films. IJ-061 EFFECTS OF HEAT TREATMENT ON BLUE SAPPHIRES AS MONITORED BY ESR SPECTROSCOPY Nitinai Udomkan, Pichet Limsuwan, Pongtip Winotai, Siwaporn Meejoo International Journal of Modern Physics B, Vol. 19, No. 20, 2005, pp. 3273-3284 We report effects of heat treatments on physical properties and finding optimal heating condition to add value to Thai blue sapphires. The color of sapphire arises from the presence of trace 3d-transition ions in its crystal lattice. For blue sapphire, the color is due to a charge transfer mechanism between Fe 2+ and Ti 4+ ions. However, iron may adopt both Fe 3+ and Fe 2+ due to oxygen vacancies. Fe 3+ and Fe 2+ yield sapphire yellow and green colors, respectively. Therefore, we have to convert as many as possible of Fe 3+ to Fe 2+ by heating the blue sapphire in N2 atmosphere for 12 h. Experimental results reveal that the ratio of lattice parameter c/a increases with the heating temperature and reaches maximum at 1700°C, which can be caused by displacement of Fe 3+ ions or more Fe 3+ ions being converted to Fe 2+ . ESR signals show that the number of Fe 3+ ions decreases roughly linearly with the heating temperature. The intense sky blue color was achieved after the 1500°C heat treatment, having the Fe 3+ / Fe 3+ RT ratio ~0.78. The optimal heat treatment should therefore be at 1500°C in flowing N 2 atmosphere for Thai blue sapphires which yield intense sky blue color and good crystal clarity. The blue sapphires exhibited KMUTT Annual Research Abstracts 2005 good clarity but light sky blue due to the increase in lightness after the treatment at 1700°C. A monoclinic distortion of the corundum structure has been found to start at the 1600°C treatment by ESR spectrometer. This is also clearly evident from low angle shifts of XRD peaks after heating at 1700°C. We can therefore conclude that the color change of Thai blue sapphires arises from the conversion of Fe 3+ to Fe 2+ and thus the change in crystal field. The monoclinic distortion of the crystal structure may also play an important role in coloring the sapphires after the heat treatment at 1600- 1700°C. IJ-062 ELECTRON SPIN RESONANCE STUDIES OF MN 2+ IN FRESHWATER SNAIL SHELLS : POMACEA CANALICULATA LAMARCK AND FOSSILIZED SNAIL SHELL Nitinai Udomkan, Siwaporn Meejoo, Pichet Limsuwan, Pongtip Winotai, Yaowalak Chaimanee Chinese Physics Letters, Vol. 22, No. 7, July 2005, pp. 1780-1783 We study paramagnetic Mn 2+ ions present in the nowadays shells of univalve freshwater snails of Pomacea canaliculata lamarck (PCL) and the fossilized freshwater snail (FFS), Viviparus. All these shells are abundant in Thailand. The PCL shells were ground into fine powder. A set of seven samples were then separately annealed for 2 h in air atmosphere at different annealing temperatures while the FFS powder was characterized asreceived. The PCL shells mainly consist of aragonite and a fraction of calcite. The heat treatments of the PCL powder samples at temperature higher than 450 o C resulted in an irreversible phase transformation from aragonite to calcite. However, it is found that the FFS shell is mainly made of calcite, with a minor fraction of aragonite. The crystal structure of the high-temperature-annealed PCL samples are quite similar to that of FFS, which indicates that the metamorphosis (aragonite → calcite) in the FFS shell had occurred but was not yet completed, although it had remained under the pressure and temperature of the Earth's crusts over millions of years. Our detailed ESR spectral analyses of PCL and FFS show that Mn 2+ ions enter the Ca 2+ sites during a biomineralization process. Simulated ESR parameters of PCL-500 of Mn 2+ at a uniaxial site International Journal

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  • Page 61 and 62: 54 นอยกวาแบบต
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    72 การสกัดดวย

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    74 collection of authentic texts th

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    76 รอยละ 32 มีสา

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    National Conferences

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    210 จอมเทียนปา

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    212 การสกัดสาร

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    214 ไดแก อุณหภู

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    216 โดยกลไกของ

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    218 เคลือบเมื่

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    220 สําเริง จัก

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    222 ลดเวลาตลอด

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    224 อุณหภูมิสู

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    226 NC-043 การวิเคร

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    228 เกิดพฤติกร

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    230 เดียว เพื่อ

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    232 มากนอยเพีย

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    234 หลักที่พบใ

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    236 NC-073 การออกแบ

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    238 บทความนี้น

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    240 นําเอาเวคเ

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    242 งานวิจัยนี

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    244 การอบแหงลด

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    246 แยกเฟสต่ํา

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    248 กลบ โดยเปรี

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    250 นํามาใช คือ

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    252 วิเคราะหหา

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    254 NC-123 การวิเคร

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    256 NC-129 เครื่องผ

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    258 สามารถขยาย

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    260 ครั้งที่ 43, 1-

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    262 calculated with the use of the

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    264 Version 1.3.1 และ Softwar

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    266 ขนไกได จากก

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    268 โครงสรางขอ

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    270 การปลูกพืช

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    272 ระดับพึงพอ

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    274 ของแกสโซฮอ

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    276 1) สภาพทั่วไ

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    278 อนุปริญญา แ

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    280 อาชีวศึกษา

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    282 กระทบตอคุณ

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    284 ตั้งกลไกแข

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    286 นุชจรินทร เ

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    288 โดยรวมผูบร

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    290 แนนกระแสไฟ

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    292 NC-222 ผลงานตีพ

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    294 NC-227 เตาเผาไห

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    296 จําเพาะรวม

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    298 NC-238 จลนพลศาส

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    300 ทนงเกียรติ

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    302 ดีเซลนั้นม

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    304 NC-254 การใชเทค

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    306 อาคารศูนยก

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    308 กระบวนการร

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    310 บรรยากาศขอ

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    312 metal ions on 2-AP biosyntheis

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    314 total clones while the ethanol

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    316 การประชุมท

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    318 BioThailand (The 16 th Annual M

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    320 สูงที่สุดพ

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    322 นัยสําคัญท

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    324 ความเขมขนร

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    326 ปลูกแบบพรา

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    328 นี้ทําใหทร

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    330 ดุลชาติ มาน

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    332 ไมโครเมตร ส

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    334 In this study, we collected seq

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    336 กนกรัตน นาค

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    338 การพัฒนาสื

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    340 one of the causes of difficulty

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    342 ทวีรัตน วิจ

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    344 program, Cytoscape. This model

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    346 production demand. Nevertheless

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    348 อุลตราไวโอ

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    350 นี้อยูในชว

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    352 เพื่อนําสว

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    354 trichloroacetic acid (TCA) ม

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    356 ทรัพยากรที

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    358 ในประเทศสห

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    360 8-9 ธันวาคม 2548,

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    362 ซึ่งเกิดขอ

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    364 NC-391 การวิเคร

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    366 การประชุมว

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    368 2547) พบวามหาว

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    370 กนกพร ลีลาเ

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    Authors Index

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    376 จงจิตร หิรั

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    378 ธ ธนธร ทองส

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    380 พยุงศักดิ์

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    382 วรรณพ วิเศษ

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    384 สุดารัตน จิ

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    386 อุลาวัณย กุ

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    388 138, 141, 142 Jarunya Narangaja

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    390 Panida Kongsawadworakul 191 Pan

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    392 Sorakrich Maneewan 124, 136 Sor

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    394 KMUTT Annual Research Abstracts

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