cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.14457/cu.the.2014.22
title: MULTIVARIATE STATISTICAL ANALYSES IN OPTICAL SPECTROSCOPIC SENSOR ARRAY FOR DISCRIMINATING ORGANIC AND BIOLOGICAL SAMPLES

description: Due to environmental and public health concerns, detection of organic materials in biological samples, such as proteins contained in dairy products, surfactants extensively used in cosmetic and pharmaceutical products, volatile organic compounds (VOCs) contaminated in soft drinks, and foodborne pathogens, is of importance for economic and legal issues. Multivariate statistical analyses applied to the optical spectroscopic response which is induced by interactions between sensing element and organic materials allow a possible discrimination of biological samples. The pattern recognition of fluorescence responses upon addition of commercial milk samples to fluorophore solutions are analyzed by linear discriminant analysis (LDA). Milk samples according to their thermal processes; i.e. pateurized milk, sterilized milk, UHT fresh milk and recombined milk (UHT milk having milk powder) are discriminated with 100% classification accuracy. LDA is also successfully applied for the discrimination of eight foodborne pathogens. Anionic surfactants are successfully identified by using principal component analysis (PCA) applied to percentage of colorimetric response obtained from the UV-Vis spectra of polymerized diacetylenes in the presence of anionic surfactants. PCA is also applied to the RGB color changes profile plot obtained from images of paper-based polydiacetylene colorimetric sensor array developed for the detection and identification of VOCs.
DOI: 10.14457/cu.the.2014.23
title: STRATEGIES FOR TRANSLATING THE SPEECH ACTS OF DIRECTIVES, REJECTIONS, AND INQUIRIES IN ENGLISH DIALOGUES INTO THAI

description: This research investigates the similarities and differences in expressing the speech acts of directives, rejections, and inquiries in the English texts and Thai-translated texts, and the strategies in translating them from English into Thai. The analyses focus on the linguistic forms of directives, rejections, and inquiries in the English texts and the Thai-translated texts and the factors governing them, as well as the translation strategies employed to cope with the differences in the linguistic forms of these three speech acts in the two languages. The analyses was done with the dialogues in two contemporary British fictions, Bridget Jones’s Diary (1996) and Turning Thirty (2000), and their Thai-translated version in the three linguistic dimensions, namely, direct-indirect speech acts, pragmatic structures, and politeness strategies. It is found that the direct linguistic forms are used more in the English texts than in the Thai-translated texts, and the indirect linguistic forms are used more in the Thai-translated texts than in the English texts, as hypothesized. These findings result from the influence of the contexts of culture because the English language is the low-context-culture language, while the Thai language, even in the translated texts, is the high-context-culture language. As for the translation strategies, it turns out that the literal translation is selected to make the translation achieve the pragmatic equivalence more than the free translation and the findings support the hypothesis that the orientation towards literal or free translation depends on the degree of imposition of the speech acts.
DOI: 10.14457/cu.the.2014.24
title: A STUDY OF ASSOCIATION BETWEEN DAILY PHYSICAL ACTIVITY AND THE ONSET OFNECK AND LOW BACK PAIN IN OFFICE WORKERS AND DEVELOPMENT OF DAILY PHYSICAL ACTIVITY MEASUREMENT TOOL FOR PREVENTING NECK AND LOW BACK PAIN IN OFFICE WORKERS

description: Thesis new version
DOI: 10.14457/cu.the.2014.25
title: ELECTRICAL IMPROVEMENT OF PEDOT : PSS BY INCORPORATION OF GRAPHENE AND SOLVENT DIPPING TREATMENT

description: In this research, the electrical conductivity of poly(3,4-ethylenedioxythiophene): poly(styrene sulfonate) (PEDOT:PSS) ink was improved by adding graphene which is the excellent material in terms of electrical conductivity. Here, click reaction was conducted as a chemical functionalization for improving graphene dispersion in PEDOT:PSS. Click reaction was carried out under mild reaction condition with high yield. Graphene was synthesized via modified Hummer method following by reduction with hydrazine. A terminal alkyne modified graphene sheet was prepared by amidation, while the terminal azide modified PEDOT:PSS was synthesized. The alkyne and azide functional groups were coupled via click reaction using copper as catalyst. The results showed that the modified graphene was well dispersed in PEDOT:PSS composites in comparison with the unmodified graphene as a result of improved interaction but it tended to aggregate as loading increased. Furthermore, the electrical conductivities of modified PEDOT:PSS-graphene composites were higher than those of unmodified ones. However, the electrical conductivity was still not high as expected; the dipping method of dried PEDOT:PSS films was also studied. It was found that the electrical conductivity was significantly improved when the PEDOT:PSS film was dipped in low concentration of aqueous dimethyl sulfoxide solution. Moreover, the dipped film showed high transparency and low surface roughness without crinkles and white patches which might be found in case of the film dipped in pure water and pure dimethyl sulfoxide.
DOI: 10.14457/cu.the.2014.26
title: URANIUM EXTRACTION FROM SEAWATER USING CHROMIC ACID PRE-TREATED POLY(ACRYLONITRILE) AMIDOXIME FIBERS

description: Uranium extraction from seawater using chromic-acid-treated amidoxime adsorbent was studied. Chromic-acid-treated amidoxime fibers were synthesized based on the simultaneous irradiation grafting method at low temperature. Low-density polyethylene (LDPE) fibers were treated with chromic acid for up to 90 minutes. After the treatment, fibers were submerged in 60 : 40 acrylonitrile : methacrylic acid monomer by volume and irradiated with gamma ray from Co-60 for a total dose of 40 kGy. The maximum grafting efficiency of about 90% occurred at 20 minutes of chromic acid treatment time, which was as much as 30% higher than literature-reported values. Cografted fibers were converted into amidoxime fibers by reaction with hydroxylamine hydrochloride solution for 75 minutes, obtaining the amidoxime group density of 2.65 mol/kg. Chromic acid pre-treated amidoxime fibers submerged in Andaman seawater with the average temperature of 30oC for 4 weeks exhibited the uranium adsorption capacity of 2.06 g-U/kg-adsorbent, which was 37% higher than literature-reported values. These significantly-increased grafting and adsorption efficiencies were attributed to the increased surface area of LDPE fibers appropriately treated with chromic acid. Study on the usage repeatability of chromic-acid-treated amidoxime fibers revealed that the adsorption capacity reduced to about 65% after 8 cycles of repeated usage. Uranium concentration in Thailand's seawater was analyzed to be around 3 ppb, regardless of location and depth of seawater.
DOI: 10.14457/cu.the.2014.27
title: CHEMICAL CONSTITUENTS AND CYTOTOXICITY FROM ROOTS OF Clerodendrum paniculatum, THE STEM BARK OF Walsura trichostemon AND TUBER OF Butea superba

description: The phytochemical investigation of the CH2Cl2 crud extract from the roots of C. paniculatum Linn. afforded six known compounds, β-sitosterol (1.1), lupeol (1.2), oleanolic aldehyde acetate (1.3), the mixture of stigmasta-4,25-diene-3-one (1.4) and (22E)-stigmasta-4,22,25-trien-3-one (1.5) and (3β)-stigmasta-4,22,25-trien-3ol (1.6). All isolated compounds were tested for their cytotoxicity against KB and HeLa cell lines, oleanolic aldehyde acetate (1.3) showed significant cytotoxic activity against the KB cell line with IC50 value of 9.58 µg/mL. On the other hand, (3β)-stigmasta-4,22,25-trien-3ol (1.6) also exhibited moderate cytotoxic activity against the KB cell line with IC50 value of 13.14 µg/mL. To the best of our knowledge, this is the first report on chemical constituents and biological activity from this plant. The various chromatographic techniques of EtOAc and acetone crude extracts from the bark of W. trichostemon Miq. led to the isolation of a new tirucallane, trichostomonoate (2.1), along with eight known compounds, mangstenone F (2.2), desmethoxy kaunugin (2.3), grandifolinolenenone (2.4), cholest-4-en-6β-ol-3-one (2.5), sapelin E acetate (2.6), α-mangostin (2.7) 11α,20-dihydroxydammar-24-ene-3-one (2.8) and kaempferol (2.9). The new compound (2.1) displayed good potent cytotoxicity against only HeLa cells (IC50 3.8 µg/mL) in the in vitro tumor cell panel and showed moderate cytotoxicity against KB, COLO 205 and LLC cells (IC50 4.4, 5.3 and 5.5 µg/mL, respectively). The isolation and purification of the CH2Cl2, acetone and MeOH extracts from the tuber of B. superba Roxb. yielded the isolation of seven known compounds, β-sitosterol (1.1), 8-O-methylretusin (3.1), (6αR,11αR)-medicarpin (3.2), formononetin (3.3), 2,3-dihydroxypropyl hexacosanoate (3.4), ononin (3.5) and daidzein-7-O-glucoside (3.6). Compound 3.6 displayed moderate cytotoxicity against KB and HepG-2 (IC50 5.32 and 10.13 µg/mL, respectively). In addition, compounds 1.1, 3.1, 3.2, 3.5 and 3.6 were reported for the first time for this plant.
DOI: 10.14457/cu.the.2014.28
title: POLYMERIZATION OF 1,3-BUTADIENE USING Co/Nd AND Ni/Nd CATALYSTS

description: Commercial butadiene rubber (BR) synthesized from 1,3-butadiene (BD) polymerization using neodymium (Nd)-based Ziegler-Natta catalyst coordinated with alkylaluminium halides as co-catalysts contains 97-99 % cis-1,4 configuration, which is higher than BR produced from Ni- or Co- based catalyst system: Moreover, the Nd-based catalyst provides 100% BD conversion without gel formation in the obtained BR product and this system ฟสหน produces less vinyl-cyclohexene content. However, the BR obtained from Nd-based catalyst (Nd-BR) has high viscosity, which is inappropriate for the production of poly(acrylonitrile-butadiene-styrene) (ABS). The Nd-BR also has high cold flow properties inducing poor extrudibility. Since BR produced from Ni- (Ni-BR) and Co-based catalyst (Co-BR) has higher degree of branching, it results in better processability. However, Ni- and Co- based catalysts require triethylaluminum (TEAL) and diethylaluminum chloride (DEAC) as co-catalysts. Therefore, the objective of this research is to combine the advantage of these catalysts to produce BR with high content of cis-1,4 structure, good mechanical properties and easy processing. The results showed that the use of Nd mixed with Co (Co/Nd) and Nd mixed with Ni (Ni/Nd)- based catalyst systems coordinated with TEAL and DEAC in the presence of cyclohexane provided 90% and 100% BD conversion, respectively. The obtained BR had content of cis-1,4 configuration higher than 97% and low amount of vinyl-1,2 unit (0.14-0.40%) with the greater mechanical properties and abrasion resistance than the commercial BR produced by using Co- or Ni- based catalyst.
DOI: 10.14457/cu.the.2014.29
title: MECHANISMS OF MULTIDRUG RESISTANCE IN PSEUDOMONAS AERUGINOSA CLINICAL ISOLATES FROM COMPANION ANIMAL AND HUMAN PATIENTS

description: Pseudomonas aeruginosa has been notoriously known for its intrinsic and acquired resistance to multiple antimicrobial agents simultaneously. So far, mechanisms underlining multidrug resistance (MDR) in P. aeruginosa have been extensively studied but mostly, in laboratory stains. Such information is still limited in the clinical isolates. Therefore, the goal of this dissertation was to understand genetic mechanisms responsible for MDR phenotype in P. aeruginosa clinical isolates. We examined two major MDR mechanisms, including integrons and multidrug efflux systems (Mex) of the Resistance-Nodulation-Cell Division (RND) family, in the P. aeruginosa clinical isolates from animals and humans (n=114). One of the major findings was the high prevalence of class 1 integrons containing resistance genes cassette (69.3%) in the P. aeruginosa human isolates admitted to a hospital (n=101). Five novel resistance gene cassettes including aacA7-cmlA, aadB-blaOXA-10-aadA1, aadB-arr-2-cmlA- blaOXA-10-aadA1, aadB-cmlA-aadA1 and aadB-cmlA- blaOXA-10-aadA15 were identified (50.5%). Up to date, there are up to 12 RND efflux operons found on P. aeruginosa chromosome, of which six Mex systems (i.e. MexAB-OprM, MexCD-OprJ, MexEF-OprN, MexJK, MexVW and MexXY) have been shown to extrude antimicrobial substrates and play a role in cross-resistance among antimicrobials. The predominant finding was the simultaneous expression of at least 3 Mex systems in a single P. aeruginosa isolate from either humans or animals (n=43), suggesting that expression of several Mex systems concomitantly contributes to multiple drug resistance in the clinical isolates. Role of normally silent Mex systems including MexCD-OprJ, MexEF-OprN, MexJK and MexVW were highlighted. Method for simultaneous detection of four-clinically important Mex systems were developed using combination of resistance-phenotypic markers and multiplex RT-PCR. In conclusion, the results demonstrated an intriguing and complex picture of expression and regulation of the Mex systems in the P. aeruginosa clinical isolates. The observations demonstrated that multiple pathways existing to participate in MDR phenotypes and contribution of normally silent Mex systems should not be underestimated. In addition, control/prevention strategies for antimicrobial resistance need to be encouraged e.g. responsible therapeutic use of antimicrobials, routine antimicrobial resistance monitoring and public education.
DOI: 10.15129/2365ed7a-4695-4928-b748-44308585b1a2
title: Data for: "Nanodiamonds enable adaptive-optics enhanced, super-resolution, two-photon excitation microscopy"

description: Original data associated with the paper "Nanodiamonds enable adaptive-optics enhanced, super-resolution, two-photon excitation microscopy". Further details on the data are available in the FileFormatDescription.txt, Readme.txt and Data_info.txt files
DOI: 10.17632/ppfhnjwnfd.1
title: Supplementary document

description: This file is the supplementary document for the paper: Fathi M., Nourmohammadi A., Ng A. H. C., & Syberfeldt A., Eskandari H. (2019). An improved genetic algorithm with variable neighborhood search to solve the assembly line balancing problem. Engineering Computations. DOI 10.1108/EC-02-2019-0053.
DOI: 10.14457/cu.the.2014.30
title: ACCOUNTING CONSERVATISM AND FUTURE INVESTMENT OPPORTUNITIES

description: This research investigates the relationships between accounting conservatism, captured using the timelier recognition of economic losses and future investment opportunities, and the mediating role of the implied costs of equity capital on those relationships of Thai listed firms during the period of 2005-2011. Conservatism benefits debt markets as an efficient mechanism of contracting and governance. Its usefulness to equity markets is however little explored and thus remains ambiguous, especially in the emerging market of Thailand where high foreign fund flows reflect the increasing need of external equity for business expansion, while corporate growth is severely restricted by agency problems. The timelier loss recognition can mitigate those problems by constraining managers’ ability to withhold losses and accelerate the recognition of unverified gains to appropriate outside shareholders’ wealth. This study hypothesizes the positive associations between conservatism and investment opportunities, and those positive associations are mediated by lower implied costs of equity capital. This research study finds that firms with a higher (lower) degree of accounting conservatism are more (less) likely to have higher future investment opportunities. The results hold after controlling for information asymmetry and using a realized proxy of investment opportunities. Nevertheless, no evidence of the mediating role of the implied costs of equity capital and the moderating role of information asymmetry is discovered. The results also indicate that firms with lower (higher) implied costs of equity capital are more (less) likely to enjoy future investment opportunities. Overall, the research provides evidence to verify that accounting conservatism through the timelier loss recognition by Thai firms benefits future investment opportunities.
DOI: 10.14457/cu.the.2014.32
title: Cu-Fe BIMETALLIC MATERIAL ON ARSENIC REMOVAL UNDER GAS-BUBBLING CONDITIONS

description: Arsenic removal was investigated using nano X-Fe (bimetal) particles. Copper and nickel were selected as additional metals into NZVI. Under a batch condition with an initial concentration of 5000 µg/L of arsenic, pH of 7.0, nanoparticles of Cu-Fe showed higher arsenic treating efficiency over Ni-Fe and NZVI. The synthesis of Cu-Fe was further investigated via two kinds of synthesis techniques. One was an in-situ [(Cu-Fe)IS] and the other was impregnation [(Cu-Fe)IM]. Properties of both materials were characterized by SEM-EDX, TEM, BET, and XANES. The arsenic removal was carried out in CO2/O2 gas bubbling under the flow rate of 300 ml/min accommodating low pH and high DO condition. Copper loading varied from 2.5-30.0%wt was studied on both (Cu-Fe)IS and (Cu-Fe)IM, where 10%Cu loading under impregnation synthesis technique provided highly removal on both As(III) and As(V) in synthetic wastewater. The mechanism of arsenic removal on Cu-Fe was proposed. A mixture of As(III)-As(V) solution was tested and it was found that solution containing As(V) individually showed the faster in arsenic removal. Furthermore, the removal of arsenic species, including As(III) and As(V), in field groundwater and synthetic groundwater by (Cu-Fe)IM were tested. The presence of background species was observed significantly on arsenic removal. Concerning in kinetics of arsenic removal using (Cu-Fe)IM in gas bubbling system, it was well fit with pseudo-second order and pseudo-first order for As(III) and As(V), respectively. Rate constants were evaluated to be 0.0003 L∙(µg∙min)-1 for As(III), and 0.1489 min-1 for As(V). The proposed gas bubbling system was conducted in a continuous system for multiple additions of (Cu-Fe)IM, providing a beneficial outcome of arsenic treatment to meet a standard drinking limitation of 10 µg/L.
DOI: 10.14457/cu.the.2014.33
title: EFFECT OF SILVER NANOPARTICLE (AgNPs) ON 'KDML 105' RICE Oryza sativa L. SEEDLINGS

description: This research was aimed to study the effects of different sizes 20, 30-70, 70-120 and 150 nm and different concentration 0.1, 1, 10, 100 and 1,000 mg/L of AgNPs on rice Oryza sativa L. seedlings under normal and salt stress conditions based on the hypothesis that AgNPs had affected on rice seedlings growth by possibly inhibition or induction of rice growth, including morphological and physiological changes.The results revealed that under normal and salt stress conditions, all growth parameters, including fresh weight, dry weight, shoot height and root length were decreased relatively to the increasing size and concentration of AgNPs pretreatment by 24 hour-seed soaking prior to germination. The positive result was detected under salt stress condition, when the seeds were soaked with 1 or 10 mg/L of 20 nm AgNPs. The AgNP pretreatment significantly enhanced root fresh weight and root length in comparison with the control and other treatments. Based on the analysis of AgNPs accumulation in plant tissue, the higher uptake was found when the rice seeds were treated with smaller size of AgNPs. However, the high level of 20 nm AgNP uptake was trapped in the root rather than transported to the leaves. Therefore, the smaller size had the less negative effect on seedlings growth than the larger one, 150 nm diameter AgNPs. Cell disruption in the seedling leaves was detected, when the seeds were pretreated with 150 nm AgNPs at the higher concentration (100 mg/L). Moreover, hydrogen peroxide (H2O2) content and anti-oxidative enzyme activities were quantified under normal and salt stress conditions. When seeds pretreated with AgNPs, H2O2 was induced in both normal and salt stress conditions. The level of H2O2 contents in the salt treated plants was higher. The seed pretreatment with the 150 nm AgNPs at concentratin of 100 mg/L significantly increased hydrogen peroxide higher than control, suggesting the higher level of stress was induced by AgNP pretreatment. These supported the growth inhibition effects by AgNPs. Furthermore, 100 mg/L of 150 nm AgNP presoaking enhanced CAT, SOD, APX, GR and GPX activity. The interesting results were detected under salt stress condition when seeds were exposed to 10 mg/L of 20 nm AgNPs. SOD and APX activity in roots of seedlings germinated from the pretreated seeds were higher than the activities detected in no AgNP pretreatment control. This suggested that the appropriate size and concentration of AgNPs can be used as seed- priming agent for salt stress acclimation.
DOI: 10.14457/cu.the.2014.34
title: PREDICTION OF DIOXIN EMISSION FROM MUNICIPAL SOLID WASTE INCINERATION BY ARTIFICIAL NEURAL NETWORK AND ADSORPTION MODEL OF DIOXIN DERIVATIVES

description: Dioxin (PCDDs) emission from incineration was predicted by an artificial neural network (ANN). The prediction was based on four-year monitoring data received from an incineration in Taiwan under a capacity of 90 tons a day. The result indicated that the prediction using model based on a back-propagation neural network, a promising method to deal with a complex and non-linear data with statistical analyses in the selection of useful variables for modeling was satisfied. The suitable architecture of an ANN for using in the dioxin prediction consisted of 5 input factors, 3 basic layers with 8 hidden nodes. Five important variables included amount and frequency of activated carbon injection, concentration of hydrogen chloride in the flue gas at the stack emission, temperature at the mixing chamber, and temperature of final fuel gas emission. The correlation factor (R2) was approximately equal to 0.998 in both training and testing steps. Activated carbon injection frequency was found as the most sensitive factor for PCDDs formation and emission. Laboratory experiment was carried out to remove the derivatives of dioxin compounds using activated carbon (AC). Benzene, chlorobenzene, dichlorobenzene, and O-chlorophenol were used as adsorbates. These chemicals were adsorbed onto four types of ACs. The adsorption experiments were carried out in a fixed-bed reactor with WHSV equal to 1.2 m3/kg-hr. The highest bed capacities in all experiments were obtained from AC derived from coconut shell (ACC). The adsorption behaviors were examined by thermal gravimetric analysis (TGA). O-chlorophenol showed the highest activation energy for desorption, 107 kJ/mol, implying chemisorption behavior. The adsorptions of the derivatives of dioxin compounds onto ACC were selected for the modeling of breakthrough curves. Isotherm parameters for selected chemicals can be listed as qe = (IP1Pi)/(1+IP2Pi) where qe is equilibrium adsorption (mg adsorbate/g agsorbent), and Pi is equilibrium concentration (mg adsorbate/L); Benzene: IP1 = 204 mg/g adsorbent, IP2 = 1.20 L/ml, Chlorobenzene IP1 = 358 mg/g adsorbent, IP2 = 1.46 L/ml, Dichlorobenzene IP1 = 349 mg/g adsorbent, IP2 = 1.51 L/ml, and O-chlorophenol IP1 = 603 mg/g adsorbent, IP2 = 1.28 L/ml.