cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.14457/cu.the.2012.544
title: Determination of creatinine by spectrophotometry after extraction by functionalized MCM-41-coated magnetic particles

description: Sulfonic acid functionalized MCM-41-coated magnetic particles (Fe3O4/MCM-41/SO3H) which have magnetic properties for easy separation from sample media was synthesized. X-ray diffractometer (XRD), Fourier transforms infrared spectrophotometer (FT-IR), scanning electron microscope (SEM), transmission electron microscope (TEM), thermogravimetric analyzer (TGA) and surface area analyzer were employed for characterization of the synthesized solid. Fe3O4/MCM-41/SO3H adsorbent was used for extraction and isolation of creatinine from samples matrix prior to the analysis by Jaffé method. The influence of extraction parameters on the extraction efficiency were studied including sample pH, amount of adsorbent, sample volume, eluent concentration, extraction time and elution time. Moreover, the feasibility of reusing the adsorbent was also studied. The performance of the proposed method was investigated under chosen condition using the standard solution containing 10 and 50 mg/L of creatinine. The percent recoveries (%Recovery) and the percent relative standard deviations (%RSD) of the method were in the range of 95.3 - 98.8 % and 0.5 - 1.8 %, respectively. Furthermore, the method limit of detection (LOD) was 1.5 mg/L and the linear range could be extended up to 60 mg/L. From the analysis of spiked urine samples, the recoveries and relative standard deviation in the range of 96.7 - 99.5 and 0.2 - 1.0, respectively, were observed. The results show that the proposed method could apply for analysis of creatinine in human urine samples with acceptable accuracy and precision.
DOI: 10.14457/cu.the.2012.545
title: Effects of encapsulation of Cr-ZnO and Cu-ZnO-A1₂O₃ catalysts with silicoaluminophosphates on dimethyl ether synthesis from syngas

description: In this thesis, the experimental is divided into three parts, the catalyst mixture of Cr-ZnO catalyst and various types of zeolite, the main study of capsule catalyst, and the experimental design. The capsule catalyst was prepared by the new method named physical coating. The new coating catalysts are Cr-ZnO encapsulated by SAPO-46, and Cu-ZnO-A1₂O₃ encapsulated by SAPO-11. The capsule catalyst is simple and can be prepared without using any extra equipment. All catalysts have been characterized by SEM, EDS and XRD. All characterization techniques confirm the new capsule catalyst is compact. The total catalytic activities of capsule catalyst are higher than the conventional mixed catalyst. The reaction results show remarkably higher DME selectivity due to the spatial core-shell-like structure of capsule catalyst. The physical CuZnAl/SAPO11-PhyC catalyst showed extremely high DME selectivity at 90% and DME yield at 83%. Moreover, the study on the mixture catalyst of Cr-ZnO and SAPO-11 presented the best catalytic performance among those four types of molecular sieve (AlPO4-5, AlPO4-11, SAPO-11 and SAPO-46). The acidity properties and framework structure of zeolites were considered as the important factors. The optimum mathematical model was obtained from 2k factorial design among three variables, W/F ratio, reaction temperature and weight ratio of SAPO11: Cr-ZnO.
DOI: 10.14457/cu.the.2012.546
title: Multikey Quicksort for Sorting String Using Predecessor and Successor Pivots

description: Quicksort is one of the most popular internal sorting algorithms. In this research, we propose multikey quicksort for sorting sequence of integers and strings using predecessor pivots, successor pivots and the collect-center partition. Predecessor pivots and successor pivots are used to reduce the recursive calls while the collect-center partitioning is used to reduce the number of swaps. We compare the performance of our algorithm, called CC5sort, with the performance of the quicksort using adjacent pivot quicksort and the original collect-center partition. We tested an efficiency of CC5sort in four different types of data sets; nearly sorted data, nearly reverse sorted data, repeated element data and random ordered data. Our experiments show that CC5sort significantly exhibits the faster running time for random ordered data with a lot of repeated elements than collect-center partitioning and APQsort.
DOI: 10.14457/cu.the.2012.547
title: Taxonomy of centipedes order scolopendromorpha in Phang Nga Province areas

description: Centipedes of the order Scolopendromorpha were sampled during 2010-2011 in several localities of Phang Nga Province both on the mainland and on islands in the Andaman Sea. The collecting sites include three national parks on the mainland (Sri Phang Nga, Khao Lak-Lam Ru, Khao Lampi-Hat Tai Muang) as well as plantations (rubbers, oil palms, fruits etc.), and five islands (Ra and Phra Thong, Similan, Surin, Muk and Koh Khao). The main significant morphological characters used for identification are head plate, tergites, coxopleural process, forcipular tarsungulum, spiracles and ultimate legs. After morphological investigations, only 1 family (Scolopendridae) 2 subfamilies (Scolopendrinae and Otostigminae), 5 genera, 9 species 3 subspecies were identified. There are Asanada brevicornis, Scolopendra subspinipes dehaani (Scolopendrinae); Otostigmus astenus, O. glaber, O. multidens, O. scaber, Otostigmus sp., Rhysida nuda nuda, R. nuda immarginata, Steropristes violaceus (Otostigminae). Scolopendra subspinipes dehaani is quite common, occurring in all localities except Similan Island. This species is known as an aggressive venomous centipede, also occurring in household areas and harmful to humans. Scolopendra subspinipes has been introduced into many areas and is now a cosmopolitan species. Otostigmus astenus was also found in all observed localities. However, there still is not much information about this species. Steropristes violaceus has just been described under this study and occurs only in Similan and Surin Islands. This is a very rare species, it is the third species ever described for this genus. Asanada brevicornis was found only on Surin and Similan islands, like S. violaceus. The other five species were found in various localities which are discussed in the report. Further ecological surveys are needed to obtain knowledge about intra- inter-specific relationships as well as ecological roles of these animals. A discussion of subspecies in scolopendromorph centipedes is presented.
DOI: 10.14457/cu.the.2012.548
title: Analysis of distortion-induced fatigue crack at the web gap of i-beam in steel bridges

description: Distortion-induced fatigue cracking has occurred in many types of steel bridge structures, especially the welded structures where high local stresses exist. However, out-of-plane distortion-induced stresses have not been fully considered in the AASHTO design specifications. This research studies the behavior around web-gap of I-beam in steel bridges under cyclic loading and applies the linear elastic fracture mechanics concepts for prediction of fatigue cracking behavior. Besides, effects of various parameters on the distortion-induced fatigue cracking behavior are considered experimentally and numerically. The results show that finite element modeling with SED criterion is applicable for the crack path prediction. In addition, mode I and mode III affected the fatigue crack direction and fatigue crack growth rate.
DOI: 10.14457/cu.the.2012.549
title: Development of bacterial cellulose/alginate/gelatin film for food preservative

description: ในบรรจุภัณฑ์สาหรับอาหาร คอมโพสิตฟิล์มที่บรรจุสารต้านจุลินทรีย์เป็นสิ่งที่น่าดึงดูดและน่าสนใจมาก เนื่องจากมันสามารถเพิ่มคุณภาพและป้องกันอาหารจากจุลินทรีย์ก่อโรคระหว่างการเก็บได้ การประยุกต์ใช้คอมโพสิตฟิล์มจากพอลิเมอร์ธรรมชาติที่มีสมบัติต้านจุลินทรีย์จึงเป็นทางเลือกหนึ่งที่มีประสิทธิภาพสาหรับยืดอายุของอาหาร รวมทั้งการมีสุขภาพที่ดีและปลอดภัยต่อสิ่งแวดล้อมมากขึ้นด้วย ในการศึกษานี้แบคทีเรียเซลลูโลส (BC)-โซเดียมอัลจิเนต (A)-เจลาติน (G) หรือคอมโพสิตฟิล์ม BAG ถูกสร้างขึ้นด้วยวิธีการหล่อและอบฟิล์มที่อุณหภูมิห้อง โดยมีการเติมกลีเซอรอล กรดแทนนิกและสารสกัดเปลือกมังคุดที่ผ่านการสกัดด้วยเอทานอลเพื่อปรับปรุงสมบัติของฟิล์ม ซึ่งกลีเซอรอลทาหน้าที่เป็น พลาสติไซเซอร์และถูกเติมเพื่อปรับปรุงความสามารถในการเปลี่ยนแปลงรูปร่างและป้องกันการหดตัวของฟิล์มหลังกระบวนการทาให้แห้ง กรดแทนนิกทาหน้าที่เป็นสารเชื่อมโยงที่ได้จากธรรมชาติสาหรับการเชื่อมโยงเจลาตินและมีสมบัติต้านจุลินทรีย์อีกด้วย ส่วนสารสกัดเปลือกมังคุดถูกใช้เป็นสารต้านจุลินทรีย์ โดยฟิล์มที่ผ่านการปรับปรุงจะถูกนาไปศึกษาคุณลักษณะทางกายภาพ ทางเคมี เชิงกลและสมบัติต้านจุลินทรีย์ ในแง่ของสมบัติทางกายภาพและเชิงกลสามารถแสดงองค์ประกอบที่เหมาะสมของฟิล์ม BAG ที่อัตราส่วน เท่ากับ 60/20/20 โดยน้าหนัก อัตราส่วนที่เหมาะสมของกลีเซอรอลต่อสารละลายเจลาติน คือ 2:10 โดยน้าหนัก ซึ่งฟิล์ม BAG ที่มีการเติมกลีเซอรอล (MBAG) พบว่า มีความยืดหยุ่น การยืดตัว ณ จุดขาดและความคงตัวทางเคมีที่ดีกว่า นอกจากนี้อัตราส่วนที่เหมาะสมของกรดแทนนิกต่อสารละลายเจลาติน คือ 10 มิลลิกรัม ต่อกรัมของสารละลายเจลาติน ซึ่งพบว่า ฟิล์ม BAG ที่มีการเติมกรดแทนนิก (MBAGT) มีโครงสร้างเป็นแผ่นชิดกันมากขึ้น ส่งผลให้ประสิทธิภาพการดูดซึมน้าและอัตราการซึมผ่านออกซิเจนลดลง นอกจากนี้กรดแทนนิกยังแสดงหน้าที่เป็นพลาสติไซเซอร์ต่อฟิล์ม MBAGTM ในสภาวะฟิล์มเปียก โดยเข้าไปเพิ่มการยืดตัว ณ จุดขาด ของฟิล์มที่บวมน้าอีกครั้ง ในส่วนของฟิล์มที่มีสารสกัดเปลือกมังคุด (MBAGTM) จะได้ฟิล์มที่มีลักษณะผิวเรียบกว่าและหนากว่า เนื่องจากการเติมสารสกัดจะไปเพิ่มความหนาของฟิล์มและเพิ่มช่องว่างระหว่างชั้นของแผ่นฟิล์มด้วย นอกจากนี้ สมบัติการต้านจุลินทรีย์จะแสดงเป็นความเข้มข้นต่าสุดที่สามารถยับยั้งการเจริญเติบโตของจุลินทรีย์ (MIC) ซึ่งพบว่า สารสกัดเปลือกมังคุดและกรดแทนนิกสามารถยับยั้งแบคทีเรียก่อโรคในอาหารได้ ประกอบด้วย Escherichia coli, Salmonella typhimurium, Listeria monocytogenes และ Staphylococcus aureus ยิ่งไปกว่านั้นสารสกัดจากเปลือกมังคุดเป็นสารที่มีฤทธิ์ยับยั้งเชื้อจุลินทรีย์ได้สูงกว่ากรดแทนนิก ดังนั้นผลที่ได้แสดงให้เห็นว่า ฟิล์ม MBAGTM มีศักยภาพที่ดีและสามารถนามาใช้เป็นบรรจุภัณฑ์สาหรับอาหารได้
DOI: 10.34677/1728-7936-2019-4-4-8
title: ESTIMATION OF THE INFLUENCE OF DIESEL ENGINE VALVE CLEARANCE ON INTAKE MANIFOLD PRESSURE PULSATIONS
title: ОЦЕНКА ВЛИЯНИЯ ТЕПЛОВЫХ ЗАЗОРОВ ГАЗОРАСПРЕДЕЛИТЕЛЬНОГО МЕХАНИЗМА ДИЗЕЛЯ НА ПУЛЬСАЦИИ ВО ВПУСКНОМ КОЛЛЕКТОРЕ

description: The paper considers the influence of the out-of-adjustment degree of a D-240 diesel engine valve clearance on angular acceleration at the crankshaft speedup, fuel consumption and a type of absolute pressure waveform in the intake manifold. The laboratory bench includes: a D-240 diesel engine of an MTZ-82 tractor, a MotoDoc III engine tester with a low air pressure sensor and a fuel pipe pulse detector, a digital engine power indicator IMD-C, and digital fuel flow meter DFM-100. The nominal valve clearance of 0.25 mm was set for all valves. The experiment involved three phases (without valve clearance control, with nominal valve clearance values and with valve clearance values much higher than nominal) and two variants: with a mounted and dismantled air filter. The nominal valve clearance values give better acceleration and fuel consumption, which can be caused by both better air supply and the device inaccuracy. The waveforms obtained differ insignificantly, which can be attributed to their low practical utility for diagnosing the out-of-adjustment condition of valve clearances. However, the wider valve clearances cause an iterative echo vibration impulse, which is definitely related to impact processes in the valve mechanism. It has been experimentally proved that a method of analyzing vibro-acoustic waveforms of a running engine is more informative for detecting the considered defect.
description: Рассматривается влияние величины разрегулировки тепловых зазоров клапанного механизма трактор-ного дизеля Д-240 на угловое ускорение при разгоне коленчатого вала, часовой расход топлива и вид осцилло-грамм пульсаций абсолютного давления во впускном коллекторе. Экспериментальная установка включает в себя дизель трактора МТЗ-82, мотор-тестер MotoDoc III с датчиками регистрации низкого давления воздуха и пульсаций топлива в трубке высокого давления, индикатор мощности двигателя цифровой ИМД-Ц, цифровой расходомер топлива DFM-100. Величина номинального теплового зазора для всех клапанов установлена 0,25 мм. Проведено три эксперимента (без вмешательства в клапанный механизм, с номинальными тепловыми зазо-рами, с тепловыми зазорами существенно выше номинальных) и осуществлены замеры с установленным воз-душным фильтром и без него. При правильной установке зазоров показатели углового ускорения и расхода топлива несколько изменяются, что может быть вызвано как увеличением воздухоподачи в двигателе, так и приборной погрешностью. Полученные осциллограммы позволяют судить об их низкой информативности для оценки разрегулировки тепловых зазоров. При зазорах выше номинальных датчик пульсации трубки высокого давления фиксирует повторяющийся паразитный виброимпульс, который напрямую связан с ударными процес-сами в клапанном механизме. Экспериментально подтверждено, что более информативным для рассматривае-мой неисправности является метод анализа виброакустических осциллограмм работы двигателя.
DOI: 10.15468/g8jmi4
title: New Agraeciini species from the Eastern Arc Mountains, East Africa (Orthoptera: Tettigoniidae; Conocephalinae; Agraeciini)

description: This dataset contains the digitized treatments in Plazi based on the original journal article Hemp, Claudia, Heller, Klaus-Gerhard (2019): New Agraeciini species from the Eastern Arc Mountains, East Africa (Orthoptera: Tettigoniidae; Conocephalinae; Agraeciini). Zootaxa 4664 (3): 301-338, DOI: https://doi.org/10.11646/zootaxa.4664.3.1
DOI: 10.14457/cu.the.2011.243
title: Halogenation of n-heteroaromatic hydroxy compounds with pph3/halogenating agent

description: Two new methodologies utilizing conventional heating and microwave (MW) heating for halogenation of N-heteroaromatic hydroxy compounds using PPh₃ and halogenating agent have been developed. The optimal conditions for the synthesis of N-heteroaromatic halides including type of halogenating agent, amount of reagents, reaction time and solvent were explored. In the case of conventional heating, Cl₃CCN or CBr4 in combination with PPh₃ approved to be a highly reactive reagent for the conversion of N-heteroaromatic hydroxy compounds to the corresponding halides in refluxing toluene for 4 h. On the other hand, Cl₃CCN, Cl₃CCOCCl₃ and CBr₄ with PPh3 could convert N-heteroaromatic hydroxy compounds and coumarin derivatives to desired halides in high yields at 150°C for 20 min under MW irradiation.
DOI: 10.14457/cu.the.2011.244
title: Identification of rgs19 as a target molecule of notch signaling in lipopolysaccharide-stimulated macrophages by phosphoproteomic

description: Signaling between cell to cell depends on crosstalk of many intracellular signaling molecules such as phosphoproteins. Alterations in protein phosphorylation can be found in different signaling pathways. Aberration in this process may lead to abnormal cell behaviors such as cell proliferation, differentiation and cell death. Notch signaling is an evolutionarily well conserved signaling pathway which plays critical roles in regulating development and functions of immune cells. Recent evidences suggest the involvement of this signaling pathway in activation of macrophages which are innate immune cells, by corroboratively functioning with signaling cascades downstream of pattern recognition receptors such as Toll-like receptor pathway. In this study, the patterns of phosphorylated proteins in mouse macrophage cell line were compared using a proteomics approach. Cells were pre-treated with inhibitor of the Notch signaling (GSI) or vehicle control before subjecting to stimulation with lipopolysaccharide. Phosphoproteins were examined and compared by the two-dimensional gel electrophoresis. Gels were stained with phosphoprotein-specific dye, Pro-Q Diamond, and subsequently with Coomassie stain and silver stain for total proteins. The spots with statistical significant difference in phosphorylation between treatment with or without GSI were identified by LC/MS/MS. The results identified one of the spots as regulator of G-protein signaling 19 (RGS19) which showed decreased phosphorylation when Notch signaling is inhibited. The involvement of RGS19 in TLR4 and Notch signaling in macrophages was investigated by siRGS19 silencing approach. GSI treatment and silencing of RGS19 yielded similar results of increased activation of SAPK/JNK and decreased activation of Akt The results suggested that Notch signaling regulates production of cytokine TNF and IL-6 and expression of iNOS in LPS induced activation of TLR4 in macrophage via RGS19.
DOI: 10.14457/cu.the.2011.245
title: Hollow fiber liquid phase microextraction for cr(iii) and cr(vi) speciation

description: A technique of hollow fiber liquid phase microextraction (HF-LPME) followed by diphenylcarbazide-based UV-Vis spectrophotometric method was developed for speciation of chromium in surface water samples. Aliquat 336 was used as the extraction solvent. A 2 cm-polypropylene hollow fiber membrane impregnated with Aliquat 336 was attached to a medical syringe needle tip and immersed into the sample solution. The method was based on the extraction of Cr(VI) anion into Aliquat 336 via anion-exchange mechanism. After extraction, the membrane was removed from the needle and Aliquat 336 enriched with Cr(VI) was eluted with a small volume of 1,5 diphenylcarbazide in ethanol solution. The violet complex was formed and determined by UV-Vis spectrometer at 548 nm. For the determination of Cr(III), Cr(III) was first oxidized to Cr(VI) by hydrogen peroxide in basic medium, extracted and determined as total chromium, then the amount of Cr(III) was obtained by subtracting of Cr(VI) from the total amount of chromium. Aliquat 336 concentration, extraction time, sample volume, stirring rate and matrix effect were studied and optimized. The enrichment factor about 15 and 5 were obtained for extraction of deionized water and surface water, respectively. The method evaluation showed good accuracy and precision for the determination of Cr(III) and Cr(VI) in surface water samples with recoveries ranging of 81.2-114.8 % and relative standard deviation of 4-11 %. The limits of detection were 3 and 10 µg L-1 for deionized water and surface water, respectively. The method is simple, cheap, and uses less organic solvent, which is environmental friendly.
DOI: 10.14457/cu.the.2011.246
title: Curcumin grafted poly(vinyl alcohol) for ascorbyyl palmitate encapsulation

description: In this work, encapsulation of ascorbyl palmitate (AP) into two polymeric nanoparticles, curcumin-grafted PV(OH) (Cur-PV(OH) and cinnamate-grafted PV(OH) (Cin-PV(OH), was carried out. The experiment covers polymer synthesis, particle fabrication, and encapsulation. Then, the stability of AP in the two polymeric nanoparticles and free AP in freeze-dried form and suspension form was investigated. The result showed that the encapsulated AP was more stable than the unencapsulated AP. AP in a freeze-dries form was more stable than AP in the suspension form. Moreover, AP kept under light-proof condition was more stable than that kept expected to light. AP inside the Cur-PV(OH) particles was more stable than AP co-encapsulated with curcumin inside the Cin-PV(OH) particles. Cur-PV(OH) nanospheres could be loaded with AP at the encapsulation efficiency of 80.85 ± 0.2%, at the loading of 29.00 ± 0.3% (wt of AP/total wt). An average diameter of AP-loaded Cur-PV(OH) particles was 269.80 ± 19.4 nm. The skin penetration study of AP-loaded Cur-PV(OH) particles on the ear skin of 6 month old pig using confocal laser fluorescence scanning microscope (CLFM) showed that hair follicle was the main skin penetrating routh of the AP-Cur-PV(OH) particles. Moreover, the accumulated Cur-PV(OH) at the hair follicles could release AP out into the surrounding tissue.
DOI: 10.14457/cu.the.2011.247
title: Genetic diversity of shovel-nosed lobster of the genus thenus in thailand using cytochrome c oxidase subunit i gene

description: Shovel-nosed lobsters (Thenus species) or Kang-kradan (in Thai) are an increasingly important fishery in Thailand. Genetic diversity of Thenus is needed in order to understand how it has been distributed and currently habits most of Thailand’s sea coasts. This thesis was conducted to investigate the genetic diversity of Thenus in Thailand using mitochondrial cytochrome c oxidase subunit I (CO1) gene. Two hundred and six adult Thenus specimens were sampled from ten provinces. Genomic DNA was extracted from pereiopods and the CO1 gene was amplified and sequenced. Phylogenetic trees were reconstructed using neighbour-joining, maximum parsimony, maximum likelihood, and Bayesian methods. The molecular phylogeny clearly separated the Thai Thenus specimens into three clades: 163 individuals of T. indicus, 12 of T. orientalis, and 31 of T. unimaculatus. The recently proposed propodus characteristics can be used to separate Thai Thenus species. For the genetic diversity study of T. indicus, 87 haplotypes were found. The AMOVA statistical analysis showed the significantly different genetic variation among three geographical groups (upper Gulf of Thailand, lower Gulf of Thailand, and Andaman Sea). The time of divergence between Gulf of Thailand and from Andaman Sea populations was estimated to be about 20,000 years ago. These findings are an important knowledge for establishing a sustainable fisheries and conservation management in the future.
DOI: 10.14457/cu.the.2011.248
title: A combined intervention for preventing depressive symptoms among Chinese students at Assumption University of Thailand : the effects of cultural values

description: To test the effects of a combined intervention (Behavioral Activation Treatment for Depression [BATD] plus Chinese values clarification exercise [CVCE]) for preventing depressive symptoms among Chinese college students at Assumption University (AU) of Thailand. Participants were Chinese students enrolled in AU with mild to moderate depressive symptoms as measured by scores of the Beck Depression Inventory II (BDI-II). 366 participants were screened by clustered-randomly selection fiom eleven faculties, 263 participants met the selection criteria, however only 102 students decided to attend the study. A quasi-experimental design was used. Students (n=5 1) fiom Bangna campus were assigned to a BATD-only as the control group; and students (n=5 1) at Hurnark campus were assigned to BATD plus CVCE as the intervention group. The two groups with assessments of depressive symptoms as indicated by the Beck Depression Inventory II (BDI-II); Chinese value as indicated by Chinese Value Survey (CVS) at baseline, two weeks and six months follow-up were used for analysis of variance to test the effects of BATD plus CVCE. The repeated measures analysis of variance (ANOVA) yielded significantly lower levels of depressive symptoms among intervention group at six month as compare to control group (12.33±4.91 vs. 15.28 ±4.16, p &lt; 0.05) but at two weeks the difference between two groups is not significant as the time of practices is short. The application of the Chinese Values Scale can be helpful in a behavioral activation intervention program for Chinese international college students.