cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.14457/cu.the.2014.176
title: EFFECT OF CARBON CONTENT ON HEAT TREATMENT BEHAVIOR AND ABRASIVE WEAR RESISTANCE OF MULTI-ALLOYED WHITE CAST IRON

description: Effect of carbon content on heat treatment behavior of multi-alloyed white cast irons with basic alloy composition was investigated. The multi-alloyed white cast irons with varying C content from 1.73 to 2.34% were prepared. After annealing, the specimens were hardened from 1323 and 1373 K, and then tempered at 673 to 873 K. In as-hardened state, the hardness increased first as C content rose except that the hardness of 2.34% C specimen hardened from 1373 K decreased remarkably. The volume fraction of retained austenite (Vγ) increased continuously with increasing C content. In the tempered state, hardness curve of each specimen clearly showed secondary hardening due to the precipitation of carbides as well as the transformation of retained austenite to martensite. The maximum tempered hardness (HTmax) was obtained by tempering between 798 to 823 K where the Vγ ranged from 4 to 14%. Abrasive wear resistance was evaluated by a rubber wheel wear test of each specimen tempered at three levels of temperatures. The relationship between weight loss (Wl) and wear distance (Wd) was expressed by linear function and wear rate (RW) was obtained from the slope of the straight line. In each heat treatment condition, the RW value decreased or the wear resistance increased as C content increased. In the tempered state, the lowest RW or the highest wear resistance was obtained mostly in HTmax specimens. When the Vγ values less than 5%, the RW covered in wide range but it was found that the RW lowered roughly in proportion to the increase in hardness. In the region of Vγ over 5%, the RW decreased with increasing Vγ value.
DOI: 10.14457/cu.the.2014.177
title: A DEVELOPMENT OF A SUPPORTING SYSTEM FOR CONSTRUCTION SITE LAYOUT PLANNING

description: Construction Site Layout Planning (CSLP) for building construction is a crucial process that requires variety of knowledge and experience. A planner has to study numerous aspects in order to gain an effective CSLP. Otherwise problems that affect the productivity of a project could occur and lead to cost and schedule overruns. This study investigated the factors affecting CSLP and proposed a system for implementing CSLP in the first stage of a construction project. The data collection was divided into two parts. First, an exploratory interview with a group of experts in CSLP was conducted to acquire the principles of works as reflected in real practice. Second, a multiple case study was applied to five different cases where the experts were asked to manage CSLP from their knowledge. Tabular method was applied to find similarities and differences between cases in order to verify factors affecting the CSLP and to create knowledge rule bases. These rule bases were sent back to experts to validate whether the interpretation was correct to gain the generalizations, validity, and reliability of the results. The outputs of this research are the factors influencing CSLP and a proposed system in assisting CSLP. The factors affecting CSLP are divided into thirteen groups which are the design of the building, constraints of components, relationships between components, location of the site, traffic on the site, method of work, site constraints, specifications and regulations, free space, man power, availabilities of components, duration of the project, and type of the building. A guideline was developed based on these factors and was used as the core of the proposed system. The system acts as a supporting system developed in IF-THEN-ELSE basis. The validation of the results was conducted with the rule bases and the proposed system. The rule bases were assessed in one of the case studies, and the proposed system was justified based on the comparison of layouts between experts and low expertise engineers. It was found that rule bases were suitable while the system can assist low expertise engineers to be able to do CSLP.
DOI: 10.14457/cu.the.2014.178
title: EFFECT OF SILVER AND COPPER OXIDES DOPING ON V2O5-WO3-TiO2 CATALYST FOR LOW-TEMPERATURE SELECTIVE CATALYTIC REDUCTION OF NITROGEN OXIDE BY AMMONIA

description: This research investigated effect of silver and copper oxides doping on V2O5-WO3/TiO2 catalysts, prepared by impregnation method, for selective catalytic reduction of NOX by ammonia at low temperature. The amounts of Ag2O and Cu2O were varied in ranged of 2%wt to 6%wt, while the amounts of V2O5 and WO3 in the catalysts were fixed at 3%wt. and 7%wt., respectively. TiO2 support was prepared by sol-gel method. All studied catalysts were characterized by diverse techniques such as N2-physisorption, ICP-OES, XRD and NH3-TPD. The catalytic activity testing of NH3-SCR was measured by gas chromatography. Reaction temperature was varied from 120 to 400°C. The addition of silver oxide influenced decreasing performance of the catalyst. In contrast, the addition of copper oxide enhanced the catalytic activity, especially, the copper oxide containing in 2 and 6 %wt. catalyst were observed. From the results, explicit trends in two different temperature regions was occurred in term of copper oxide loading. With 2%wt.Cu2O loading, catalytic activity increased at high temperature, while catalytic activity of 6%wt.Cu2O loading enhanced at low temperature.
DOI: 10.17632/mr247yy42x.1
title: Data for: Holocene sea levels in Southeast Asia, Maldives, India and Sri Lanka: The SEAMIS database

description: Holocene relative sea-level database for Southeast Asia, the Maldives, India and Sri Lanak ( SEAMIS database) with detailed information related to calculating estimates of vertical measurement and indicative meaning related uncertainties.
DOI: 10.21227/hf7f-5g66
title: Simulation Data of Buoyancy-affected backward-facing step flow with heat transfer at low Prandtl number

description: This data is a subset ofthe results of direct numerical simulations of a turbulent upward-directed flow of a liquid metal in a vertical channel.
DOI: 10.5281/zenodo.3339723
title: finals_2019_07_104

description: Log and boot files of game 104
DOI: 10.5281/zenodo.3339724
title: finals_2019_07_104

description: Log and boot files of game 104
DOI: 10.5281/zenodo.3339725
title: finals_2019_07_105

description: Log and boot files of game 105
DOI: 10.5281/zenodo.3339726
title: finals_2019_07_105

description: Log and boot files of game 105
DOI: 10.5281/zenodo.3339727
title: finals_2019_07_106

description: Log and boot files of game 106
DOI: 10.5281/zenodo.3339728
title: finals_2019_07_106

description: Log and boot files of game 106
DOI: 10.5281/zenodo.3339729
title: finals_2019_07_107

description: Log and boot files of game 107
DOI: 10.5281/zenodo.3339730
title: finals_2019_07_107

description: Log and boot files of game 107
DOI: 10.5281/zenodo.3339732
title: finals_2019_07_108

description: Log and boot files of game 108
DOI: 10.14457/cu.the.2014.179
title: DEVELOPMENT OF THERMAL CONDUCTIVITY MODEL OF POLYMER COMPOSITES WITH INTERFACIAL THERMAL RESISTANCE EFFECT

description: Thermal conductivity of polymers can be enhanced by incorporating the thermally conductive fillers into the polymer matrix. Various factors affect the thermal conductivity of polymer composites. The effects of interfacial thermal resistance, ratio between thermal conductivity of filler and polymer matrix, content and size of filler particles on the effective thermal conductivity of polymer composites were investigated in this work. The theoretical models for predicting the thermal conductivity of composite were derived based on the simplified solution by considering a series of thermal resistance along the heat flow direction of the representative volume element with three different arrangements of filler particles, i.e. simple cubic , body-centered cubic, and face-centered cubic. The three models derived without the interfacial thermal resistance effect predicted that the effective thermal conductivity increased with increasing filler content and the ratio between thermal conductivity of filler and polymer matrix. However, these three models overestimated the effective thermal conductivity compared with the experimental data. Among these models, simple cubic model gave a more appropriate and reasonable prediction than the others and thus it was further developed by including the effect of the interfacial thermal resistance using the Kapitza radius concept. By this way, the effect of particle size was also incorporated into the model. The modified simple cubic model indicated that the effective thermal conductivity decreased with increasing interfacial thermal resistance. The smaller filler particle size resulted in the higher interfacial thermal resistance. In addition, the model predicted that the interfacial thermal resistance decreased with increasing filler content.
DOI: 10.14457/cu.the.2014.180
title: Ultrasound Assisted Reactor for Biodiesel Production from Purified Palm Oil on Calcium Oxide Heterogeneous Catalyst

description: Biodiesel is one of the promising alternative energy that has been studied and developed in the recent year. It consists of compounds of fatty acid alkyl ester (FAAE) mostly produced from vegetable oil and alcohol using homogeneous or heterogeneous catalyst via transesterification. However, mass transfer between two immiscible reactants and also heterogeneous catalyst are hindrance resulting in the biodiesel yield. Ultrasonic assisted reactor is a practical solution to increase the level of mixing by cavitation phenomena in fluid and carrying reactants to active site of catalyst with cavitation jet. The cavitation phenomena also produce an extremely reaction condition around 5,000°C and 1,000 atm. In this work, a study of biodiesel production from transesterification of palm oil using ultrasonic assisted reactor was investigated and compared to mechanical stirred reactor. Transesterification was operated at 60°C, 1 atm, methanol to oil molar ratio of 9:1. Sodium hydroxide homogeneous catalyst provides higher methyl ester yield and faster rate of reaction than that of calcium oxide heterogeneous catalyst. The fastest rate of reaction was achieved in ultrasonic reactor at highest catalyst loading (3%wt) and methyl ester yield increases steadily until reach the same transesterification equilibrium (about 80%). The higher ultrasonic frequency and power (50 kHz, 800 W) promoted the heterogeneously catalyzed transesterification of refined palm oil. Reusability of calcium oxide catalyzed transesterification using ultrasonic assisted reaction was also studied. It was found that calcium oxide catalyst can be used to produce biodiesel and provide high biodiesel yield for three cycles with slightly decreasing rate of reaction due to organic compounds deposition. The cognitive results from this study can be developed for the further process scale up.
DOI: 10.14457/cu.the.2014.181
title: ENERGY OPTIMIZATION OF A HYDROTREATING PROCESS FOR GREEN DIESEL PRODUCTION FROM PALM OIL

description: This work focus on the hydrotreating process for green diesel production from palm oil and the energy optimization of the process. The process simulations were performed by using Aspen plus program. The green diesel production process from palm oil by using NiMoS2/γ-Al2O3 is considered. The results show that the green diesel yield, green diesel purity, liquid product distribution, hydrodeoxygenation (HDO) and decarbonylation (DCO)/decarboxylation (DCO2) reactions occurring in the process are good agreement with the experimental data. The tolerance allowed is not more than 2%. In addition, the energy optimization for green diesel production process by using the heat exchanger network is studied. To minimize the energy consumption of the process, the energy optimization is divided into 3 strategies. From the energy optimization strategy 1 and 2, the energy consumption of 81.79% and 80.73% are decreased, respectively. The difference of energy saving of strategy 1 and 2 is 1.07%. Thus, the exchanged heat sequence affects on the energy saving due to the boundary of minimum temperature difference of exchanged hot and cold streams. Based on the energy optimization strategy 3, split hot stream, the energy consumption of 89.36% is decreased when compared with the original process. The results suggest that the energy optimization strategy 3 is very promising process for green diesel production. When comparing the cost of heat exchanger network construction and cost of utilities, the energy optimization strategy 3 has the lowest annual cost. Therefore, the energy optimization strategy 3 is the most worthwhile investment. In case of the pressure drop over the process, the compressor is used to increase the pressure that results in the increasing energy requirement.
DOI: 10.14457/cu.the.2014.182
title: STABILITY OF MIXED-PHASE ALUMINA CATALYSTS FOR ETHANOL DEHYDRATION REACTION

description: Dehydration reaction is an important and basic technology for converting ethanol into ethylene product which temperature is less than pyrolysis reaction. It is also considered as alternative energy for future. Many researches improve and modify catalyst in order to obtain high selectivity. The selectivity factor mostly depends on acidity on a catalyst and temperature, which is catalytic early degradation. In this present study, the mixed gamma and chi crystalline phases of alumina catalyst calcined at 600 °C was employed for ethanol dehydration to ethylene. The mixed γ- and χ-crystalline phase alumina was prepared by solvothermal method. The catalyst was performed for ethanol dehydration reaction under atmospheric pressure at temperature of 200-400 °C in a fixed-bed reactor. They exhibited both high conversion and high selectivity to ethylene more than 90% of interval temperature 350-400°C. The catalyst was characterized by several techniques. However, the stability of these catalysts will be further investigated by reaction test at the specified temperature (300-400°C) within time-on-stream (TOS) around 6 and 12 hrs.. The coke formation will appear on the surface of spent catalysts. After TOS 12 hrs., the coke content reaches very high level, which affects to catalyst deactivation. Therefore, the operating condition (such a TOS and temperature) leads to generate coke deposited on the catalysts significantly. The different characteristics of the fresh and spent catalysts will be compared and discussed further. Moreover, the modified MoO3 loading on mixed γ- and χ-crystalline phase alumina catalysts were investigated catalytic performance at the same condition of TOS in order to study effective of metal oxide and compare with mixed phase alumina catalysts for predicable the optimum temperature.
DOI: 10.14457/cu.the.2014.183
title: DESIGN OF A LOGIC TO SUPPORT LOGISTIC COST EFFICIENT PURCHASING DECISIONS FOR A HARDWARE WHOLESALER

description: For trading companies, inventory is the primary enabler of value creation. Applying customer-friendly inventory management policies can constitute a competitive advantage that does, though, usually come along with increased costs. The consideration of costs during inventory related decision making is hence inevitable. For the purchasing of goods, inventory holding costs, ordering costs, and transportation costs need to be outweighed in order to reduce total logistics cost. Since existing economic order quantity calculations (EOQ) do not adequately consider the actual economies and diseconomies of scale that the joint replenishment problems is subjected to, a two-staged heuristic that also considers minimum order quantities and discounts on individual item level is proposed. The centrepiece of this heuristic is, though, the level of detail at which transportation costs are considered whilst simplicity is maintained. As the practicality of EOQ considerations is heavily dependent on schedule stability, a potential improvement of forecast accuracy and robustness by automatic pattern recognition is furthermore evaluated.
DOI: 10.14457/cu.the.2014.184
title: DEFECT REDUCTION IN PLASTIC PIPE EXTRUSION PROCESS

description: This thesis focuses on the study of defect reduction strategy for a plastic pipe extrusion company in Thailand. The objective of this research is to lower the plastic defect production in the company’s main plastic pipe extrusion line. The main methodology revolves around the Six Sigma’s DMAIC method of defining, measuring, analyzing, improving and controlling the defects created within the company. Define phase studies the Cause-and-Effect Diagram, Risk Analysis, and Pareto Analysis to identify the causes leading to defects production. The Measure phase involve the Failure Mode and Effect Analysis to study the key input factor affecting the causes of defects production. In the Analyze phase, the Design of Experiment (DOE) and Analysis of Variance (ANOVA) are used to determine optimal level for each critical key input factor. For the Improve phase, optimal level key input factors will be implemented and post-improvement data will be collected, followed by cost analysis. Finally, in the Control phase, strategy to sustain and control the optimal level key input factors will be discussed. In the end, the research identifies four key input factors that are mainly responsible to creating defect within the company’s main extrusion line. By finding the optimal parametric input, this research allows the company to reduce manufacturing defects from 8.8% to 5.25%; this 3.55% drop in defect production allows the company to save up to 3,600,000 million Baht on an annual basis.
DOI: 10.14457/cu.the.2014.185
title: BIO-OIL PRODUCTION FROM ALGAE BY TWO-STEP HYDROTHERMAL LIQUEFACTION PROCESS

description: Microalgae is biomass which can be used as an alternative energy source since it has high performance to produce high content of liquid fuel and it also has high growth rate. This research work presents the method to convert microalgae as the liquid fuel via hydrothermal liquefaction in semi-continuous reactor under high temperature and pressure to degrade microalgae as organic compounds with smaller molecules. The objective of this research was to study the production and quality improvement of bio-oil derived from two-step hydrothermal liquefaction and compared to one-step hydrothermal liquefaction operated at 280 to 360 oC, water pressure of 12 to 20 MPa and water flow rate of 0.25 to 1.00 mL/min. The result showed that this process carried out at 320 oC, 20 MPa and a water flow rate of 0.50 mL/min provided 29.5 wt% of bio-oil containing a large amount of nitrogen compounds (8.7 wt%). Thus, the two-step hydrothermal liquefaction was applied. In the first step, the temperature was controlled in the range of 150 to 225 oC and the temperature used in the second step was 280 to 360 oC. All process was under a pressure of 12 to 20 MPa with a water flow rate of 0.25 to 1.00 mL/min. It was found that the two-step hydrothermal liquefaction decreased the amount of nitrogen compounds to 4.8 wt% with high bio-oil yield (32.0 wt%). When the continuous phase was changed from water to basic solutions containing sodium carbonate or potassium hydroxide (10 wt% of solvent), the amount of nitrogen compounds in the obtained bio-oil decreased to 3.1 wt% with a lower bio-oil yield (22.4 wt%).
DOI: 10.14457/cu.the.2014.186
title: IN VITRO CONVERSION OF GLYCEROL TO LACTATE BY MICROBIALTHERMOPHILIC ENZYMES

description: In vitro reconstitution of an artificial metabolic pathway has emerged as an alternative approach to conventional in vivo fermentation-based bioproduction. Particularly, employment of (hyper)thermophilic enzymes enables us a simple preparation of highly stable, selective biocatalytic modules and the construction of in vitro metabolic pathways. In this study, we designed and constructed an artificial in vitro metabolic pathway consisting of nine (hyper)thermophilic enzymes and applied it to the conversion of glycerol to lactate. We also assessed the compatibility of the in vitro bioconversion system with methanol, which is a major impurity in crude glycerol released from biodiesel production processes. The in vitro artificial pathway was designed to balance the intrapathway consumption and regeneration of energy and redox cofactors. All enzymes involved in the in vitro pathway exhibited an acceptable level of stability at high temperature (60°C) and their stability was not markedly affected by the co-existing of up to 100 mM methanol. The one-pot conversion of glycerol to lactate through the in vitro pathway could be achieved in an almost stoichiometric manner and 14.7 mM lactate could be produced in 7 h. Many thermophilic enzymes exhibit higher stability not only at high temperatures but also in the presence of denaturants than their mesophilic counterpart. In this study, compatibilities of thermophilic enzymes with methanol were demonstrated, indicating the potential applicability of in vitro bioconversion systems with thermophilic enzymes in the conversion of crude glycerol to value-added chemicals.
DOI: 10.14457/cu.the.2014.187
title: ENANTIOMERIC SEPARATION OF ALCOHOLS BY GAS CHROMATOGRAPHY USING BETA-CYCLODEXTRIN DERIVATIVE AS STATIONARY PHASE

description: Enantiomeric separation of forty alcohols based on 1-phenylethanol was studied by gas chromatography using heptakis(2,3-di-O-acetyl-6-O-tert-butyldimethylsilyl)-ß-CD (or BSiAc) as a chiral stationary phase. Factors affecting analyte retentions and enantioselectivities were studied: column temperature, alcohol structure (type and position of substitution) as well as type of alcohol derivatization (trifluoroacetyl (TFA) and trimethylsilyl (TMS)). The number of underivatized alcohols that could be separated into their enantiomers was higher than those of derivatized forms. Temperature affected enantioselectivities of meta-substituted underivatized alcohols more than para- or ortho-isomers, while it affected enantioselectivities of para-substituted derivatized alcohols more than other isomers. However, derivatization could improve enantioseparation of some alcohols and may provide more symmetrical peak shapes. In addition, many TFA derivatives showed complete enantioseparation in shorter analysis time than their corresponding underivatized alcohols. In this study, enantiomeric separation of all analytes, either underivatized or derivatized form, could be observed. The shortest analysis time for complete enantioseparation was observed for 18-TFA.
DOI: 10.14457/cu.the.2014.188
title: ENANTIOMERIC SEPARATION OF AMINES BY GAS CHROMATOGRAPHY USING ACETYL-DERIVATIZED BETA-CYCLODEXTRIN AS STATIONARY PHASE

description: The enantioseparation of 49 trifluoroacetyl amine derivatives was studied by gas chromatography using heptakis(2,3-di-O-acetyl-6-O-tert-butyldimethylsilyl)-beta-cyclodextrin (or BSiAc) as a chiral stationary phase. The effects of temperature and amine structure (type and position of substitution) on retention and enantioselectivity were studied. BSiAc could resolve enantiomers of 45 amines. For 1-phenylethylamines, the position of substitution played a major role on enantioseparation than the type of substitution: analytes with meta-substitution showed good enantioseparation. The effect of type of substitution at the stereogenic center was also investigated. BSiAc showed better enantioseparation towards 1-phenylpropylamines or 1-aminoindans than 1-phenylethylamines. However, BSiAc showed poor or no enantioseparation towards phenyl phenyl methanamines which have a large phenyl group at the stereogenic center. Among all analytes tested in this study, 3CF3 showed strong temperature dependency and could be completely enantioseparated with the shortest analysis time.
DOI: 10.25386/genetics.8862317
title: Supplemental Material for Tatliyer, et al.2019

description: Simulations <br>
DOI: 10.25386/genetics.8862317.v1
title: Supplemental Material for Tatliyer, et al.2019

description: Simulations <br>
DOI: 10.5281/zenodo.3339731
title: finals_2019_07_108

description: Log and boot files of game 108
DOI: 10.5281/zenodo.3339733
title: finals_2019_07_109

description: Log and boot files of game 109
DOI: 10.5281/zenodo.3339734
title: finals_2019_07_109

description: Log and boot files of game 109