cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.14457/cu.the.2008.1647
title: Preparation of titanium dioxide/bamboo based carbon composite as electrode

description: In this research, we report a novel method for preparation of the titanium dioxide/carbon nanocomposite with high thermal stability for application in a capacitor using the disposed bamboo chopsticks as carbon source. The proposed preparation method contains 2 steps which are impregnation of the bamboo powder with a solution of titanium tetraisopropoxide in 2-propanol and subsequently carbonization at a required temperature. The effect of carbonization temperatures was studied at 500, 600 and 700°C. The XRD data showed that crystalline TiO2 was readily formed as anatase structure at all of the three temperatures. It is very interesting that rutile phase was not observed at all. It is well known that titanium dioxide prepared by other methods normally undergoes anatase-to-rutile phase transformation in the temperature range from 600 to 700°C and anatase is completely converted to rutile above 700°C. It indicates that carbon from bamboo can obviously stabilize the nano-anatase phase up to 700°C. The crystal size of anatase is affected by the carbonization temperature and method of preparation. This method provided nanocrystals of anatase with about one half smaller crystal sizes than that prepared by the conventional method which was performed in the alternative sequence of preparation steps. SEM was used for the identification of the surface morphology and particle size. The adsorption isotherms of the composites show the characteristic of micropores. The composite prepared by this novel method has lower BET specific surface area than that prepared by the conventional method. It can be explained that TTIP can penetrate into wide pores of the bamboo texture and convert to nanocrystals of anatase inside the pores of resulted porous carbon. Simultaneously, carbonization results in encapsulation of the anatase particle within the pores of carbon. The composites from the conventional method contain TiO2 outside the pores of carbon. The latter causes relatively larger crystals on the outer surface of carbon and leaves more space inside the carbon pores. Cyclic voltammetry and electrochemical impedance spectroscopy were employed to characterize the electrochemical performances of the composite electrode. The specific capacitance of the composite electrode is affected by the carbonization temperature and TiO2 content in the composite. However, the composite treated by phosphoric acid shows an enhanced specific capacitance. The composite is potential to be applied further as electrode materials for electric double layer capacitors.
DOI: 10.14457/cu.the.2008.1648
title: Protecting labor rights of Burmese migrant workers : a case study of Yaung Chi Oo Workers Association in Mae Sot, Thailand

description: In 2008, Thai Ministry of Labor acknowledged that the Kingdom will need to employ 1.2 million low-skilled migrant workers in order to solve the problem of the labor shortage in the country. In fact, about 2 million migrants have already settled in Thailand and more than 80 percent of the migrant labor forces employed in Thailand’s various economic sectors are the Burmese who migrated into the Kingdom crossing the border. Mae Sot is one of the most migrant-concentrated border towns where more than 200,000 Burmese migrants lived and worked mainly in the industrial sector such as garment, knitting and other factories. This research studied why the YCO with an unauthorized status is able to provide legal and other assistance to protect the labor rights of the Burmese migrant workers in Mae Sot within the legal framework of Thailand and also found out a new social legitimacy in terms of labor rights protection that has emerged following the activities of the YCO. As a qualitative research emphasizing on a case study of the Yaung Chi Oo Workers Association, a Burmese labor rights organization in Mae Sot, the research conducted a series of in-depth interviews with the key informants from the YCO and several leaders from the Thailand-based Burmese civil society organizations, group discussions with the selected migrant workers, interviews with a labor officer at the DLPW in Mae Sot and Thai NGOs workers and lawyers. The research found out that the violations of the Labor Protection Act B.E. 2541 have been rampant in Mae Sot. The institutional weakness of the concerned government agencies and the impunity that the factory employers have received in Mae Sot leads to these violations. Therefore, Thai and non-Thai civil society organizations have stepped in to protect the labor rights of the Burmese migrant workers in Mae Sot. Among them, the YCO’s activities have contributed, to a certain extent, to the rule of law in the labor market of the border town because the organization have effectively encouraged the migrants not to stage unlawful labor strikes which can affect the social stability of the border town. The organization has steadfastly shown them a legal path to protect their labor rights. It is the key factor why the YCO with an unauthorized status has been able to provide legal assistance to the irregular Burmese migrant workers within the legal framework of Thailand.
DOI: 10.14457/cu.the.2008.1649
title: Recycling of wood plastic composites prepared from poly (vinyl chloride) and wood flour

description: The present study emphasized on closed-loop recycling of wood plastic composite (WPC) prepared from poly (vinyl chloride) and wood flour. The research consisted of two parts. The first part concentrated on re-processing industrial scrap of WPC profiles and its mixture with freshfeed (FF) consisting of PVC filled with wood flour. Different weight ratio of the WPC scrap and its freshfeed pellets was dry blended and re- extruded as recycled-WPC profiles at 0:100, 20:80, 30:70, 40:60, 60:40, 80:20 and 100:0 by using an industrial scale twin screw extruder. It was found that the scrap could be mixed up to 30 wt% without losing in the flexural, tensile, compressive properties, suggesting that the 30:70 was the most appropriate mix ratio. The second part focused on the influences of the number of recycling passes for up to 7 passes. A drop in the mechanical properties was notable at the second pass, and it remained relatively unchanged until the fifth pass. Flexural properties were reduced on the seventh pass of recycling. Estimation of the average molecular weights and the molecular weight distribution of the PVC matrix in the recycled WPC revealed that they remained relatively constant until the fifth pass of recycling, the and the were reduced by 14% and 11% respectively at the fifth pass. Significant decrement of both the and the by 35% and 30% was evident on the seventh pass of recycling. Upon re-processing, molecular chain scission was believed to have occurred as a consequence of the shear stress introduced repeatedly on the PVC melt during each re-processing pass. The impact property was found to remain relatively unchanged. Thermal properties such as glass transition temperature (Tg) and degradation temperature (Td) as well as water absorption behavior were not affected by the recycling process. Rheological results in terms of the fusion torque of the recycled WPC were in agreement with the changes in the molecular weight as aforementioned, the fusion torque was notably lowered at the seventh pass of recycling. The present research revealed that the WPC could be recycled repeatedly up to five passes without critically affecting the mechanical, thermal and physical properties of the recycled WPC.
DOI: 10.14457/cu.the.2008.1650
title: Selective catalytic reduction of NO by NH₃ over V₂O₅-WO₃/TiO₂ catalyst promoted by Mn and another metal (Ce, Cu or Fe)

description: In this work selective catalytic reduction (SCR) of nitrogen oxide by ammonia over V₂O₅-WO₃/TiO₂ catalysts and V₂O₅-WO₃/TiO₂ catalysts that were promoted with manganese and another metal (cerium, copper, and iron) was investigated. Titanium dioxide was prepared by a sol-gel method and vanadium and tungsten were added to TiO₂ by wet impregnation method. Various techniques including nitrogen adsorption, XRD, NH3-TPD, XPS, and ICP-OES were employed to characterize the catalysts. V₂O₅-WO₃/TiO₂ catalysts ware then used in the SCR of NO by NH₃ at a temperature ranging from 100-450℃. Almost complete conversion of NO was achieved by most catalysts 250-350℃. Among the nine catalysts the V₂O₅-WO₃/TiO₂ catalyst containing 3 wt.% vanadium and 12 wt.% tungsten (3V12W) was the best one, which maintained high activity in the widest temperature range. In order to improve the activity of the V₂O₅-WO₃/TiO₂ catalyst under wet condition, manganese and another metal (cerium, copper, and iron) were deposited on the catalyst by an incipient wetness impregnation method. When water vapor was present in the feed stream, the activity of the catalyst became lower because water vapor competed with ammonia for reaction site on the catalyst. However, when the V₂O₅-WO₃/TiO₂ catalysts promoted with manganese and cerium or manganese and iron were employed, the catalysts maintained their activities even when water vapor was present in the feed stream.
DOI: 10.14457/cu.the.2008.1651
title: Synthesis of nanocrystalline ZSM-5 catalyst for production of gasoline from polyolefin waste

description: ZSM-5 was synthesized using two different methods: hydrothermal and xerogel methods. The hydrothermal synthesis method was carried out by mixing sodium metasilicate pentahydrate solution, a sodium aluminate solution and a solution of tetrapropylammonium bromide, followed by crystallization at 170°C for various periods. The xerogel method was studied by synthesizing ZSM-5 from freshly prepared silica. Influences of type of the templates, pH of gel and template/SiO2 ratio on the synthesis of ZSM-5, MFI structure zeolite, were investigated. Tetrapropylammonium bromide and tetrapropylammonium hydroxide were used as templates. The values of pH from 9.0 to 11.0 and template/SiO2 mole ratios from 0.1 to 0.5 were varied. Furthermore, the influence of sonication during the gel formation step was also studied in comparison with zeolite ZSM-5 prepared without sonication. The organic template was removed from the ZSM-5 samples by calcination in a muffle furnace at 550°C. The ZSM-5 catalysts were characterized by X-ray power diffraction, scanning electron microscope, ICP-AES, 27Al-MAS-NMR, nitrogen adsorption, X-ray fluorescence and ammonia-temperature programmed desorption techniques. The obtained ZSM-5 were tested for their catalytic activity in the cracking of HDPE waste in a batch reactor under different conditions. The conversions and the yields of gas fraction and liquid fraction depend on the reaction temperature and the Si/Al ratios in catalyst. The product selectivity is affected by those factors only slightly. The gas products obtained by HDPE cracking are mainly propene, n-butane, i-butene and C5+. The liquid fraction obtained by cracking of HDPE waste composes mainly in the range of C6 to C9. The used ZSM-5 catalyst can be regenerated by simple calcination and its activity still does not change significantly.
DOI: 10.14457/cu.the.2008.1652
title: Synthesis of thermally stable polyureas and poly(urea-imide)s containing schiff base metal complexes

description: Hexadentate Schiff base zinc and nickel complexes were synthesized and used for the synthesis of metal-containing polymers. Polyureas were synthesized by reacting MNapth2trien with diisocyanates, namely 4,4'-diphenylmethane diisocyanate (MDI) and isophorone diisocyanate (IPDI). Copolyureas and poly(urethane-urea)s were synthesized from MNapth2trien/diisocyanates/diamines and MNapth2trien/diisocyanates/dialcohols, respectively. The diamines and dialcohols employed were m-xylylenediamine, (m-XDA) and 1,6-hexamethylenediamine (HMDA), 2,2-bis(4-Hydroxyphenyl)propane (BPO) and 1,6-hexamethylenediol (HDO). Poly(urea-imide)s were obtained by synthesis of metal-containing isocyanate-terminated polyurea prepolymers from the reaction between MNapth2trien and excess diisocyanates, which could then undergo further reaction with different dianhydrides. The dianhydrides employed were pyromellitic dianhydride (PMDA) and benzophenone-3,3́,4,4́-tetracarboxylic dianhydride (BTDA). Metal-containing polymers were characterized by infrared spectroscopy (IR), proton nuclear magnetic resonance spectroscopy (1H NMR), elemental analysis, X-ray diffraction (XRD), solubility and viscosity. Thermal properties of the polymers were investigated by differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA) and thermogravimetric analysis (TGA). It was found that the metal-containing polymers showed good thermal stability and solubility.
DOI: 10.14457/cu.the.2008.1654
title: Web navigation analysis and simulation using ant colony optimization

description: This paper utilizes the Ant Colony Optimization algorithm to explore an unknown web site, mapping its structure and navigation routing so that accessibility and performance information can be attained. The investigation will also unveil changing structure of the web site adaptively such as new links, removed links, and unreachable links. As a consequence, coverage of all reachable nodes within the designated web site can be obtained, along with essential performance statistics to reflect near optimal accessible paths to any given node in the web site. By virtue of the simplicity of the Ant Colony Optimization algorithm, some straightforward mapping techniques were employed to entail opportunistic commercialization of the proposed algorithm.
DOI: 10.5281/zenodo.3341497
title: CMS 2011A Simulation | Pythia 6 QCD 300-470 | pT &gt; 375 GeV | MOD HDF5 Format

description: Simulated QCD jets from the Simulated QCD 300-470 Dataset of the CMS 2011 Open Data reprocessed into the MOD HDF5 format. Jets are provided at generator (truth) level in the GEN files and after GEANT4 detector simulation in the SIM files (which also contain associated GEN jets to facilitate studies involving both types of jets). Jets are selected from the hardest two anti-kT R=0.5 jets in events passing the Jet300 High Level Trigger (only relevant for SIM) and are required to have \(p_T^\text{jet}&gt;375\) GeV, where \(p_T^\text{jet}\) includes a jet energy correction factor (again, only relevant for SIM). GEN jets contain truth-level particles with kinematic and PDG ID information, and SIM jets contain Particle Flow Candidates (PFCs) with kinematic, PDG ID, and vertex information. Additionally, jets have metadata describing their kinematics and provenance in the original CMS AOD files. For additional details about the dataset, please see the accompanying paper, Exploring the Space of Jets with CMS Open Data. There, jets were further restricted to have \(|\eta^\text{jet}|&lt;1.9\) to ensure tracking coverage and (in the case of SIM) have "medium" quality to reject fake jets. The supported method for downloading, reading, and using this dataset is through the EnergyFlow Python package, which has additional documentation about how to read and use this and related datasets. Should any problems be encountered, please submit an issue on GitHub. For reference, the other corresponding datasets of simulated jets available on Zenodo are: SIM/GEN QCD Jets 170-300 GeV SIM/GEN QCD Jets 300-470 GeV SIM/GEN QCD Jets 470-600 GeV SIM/GEN QCD Jets 600-800 GeV SIM/GEN QCD Jets 800-1000 GeV SIM/GEN QCD Jets 1000-1400 GeV SIM/GEN QCD Jets 1400-1800 GeV SIM/GEN QCD Jets 1800-\(\infty\) GeV There is an associated dataset of jets recorded by the CMS detector available on Zenodo: CMS 2011A Jets, pT &gt; 375 GeV
description: {"references": ["P. T. Komiske, E. M. Metodiev, EnergyFlow, https://energyflow.network."]}
DOI: 10.5281/zenodo.3341498
title: CMS 2011A Simulation | Pythia 6 QCD 300-470 | pT &gt; 375 GeV | MOD HDF5 Format

description: Simulated QCD jets from the Simulated QCD 300-470 Dataset of the CMS 2011 Open Data reprocessed into the MOD HDF5 format. Jets are provided at generator (truth) level in the GEN files and after GEANT4 detector simulation in the SIM files (which also contain associated GEN jets to facilitate studies involving both types of jets). Jets are selected from the hardest two anti-kT R=0.5 jets in events passing the Jet300 High Level Trigger (only relevant for SIM) and are required to have \(p_T^\text{jet}&gt;375\) GeV, where \(p_T^\text{jet}\) includes a jet energy correction factor (again, only relevant for SIM). GEN jets contain truth-level particles with kinematic and PDG ID information, and SIM jets contain Particle Flow Candidates (PFCs) with kinematic, PDG ID, and vertex information. Additionally, jets have metadata describing their kinematics and provenance in the original CMS AOD files. For additional details about the dataset, please see the accompanying paper, Exploring the Space of Jets with CMS Open Data. There, jets were further restricted to have \(|\eta^\text{jet}|&lt;1.9\) to ensure tracking coverage and (in the case of SIM) have "medium" quality to reject fake jets. The supported method for downloading, reading, and using this dataset is through the EnergyFlow Python package, which has additional documentation about how to read and use this and related datasets. Should any problems be encountered, please submit an issue on GitHub. For reference, the other corresponding datasets of simulated jets available on Zenodo are: SIM/GEN QCD Jets 170-300 GeV SIM/GEN QCD Jets 300-470 GeV SIM/GEN QCD Jets 470-600 GeV SIM/GEN QCD Jets 600-800 GeV SIM/GEN QCD Jets 800-1000 GeV SIM/GEN QCD Jets 1000-1400 GeV SIM/GEN QCD Jets 1400-1800 GeV SIM/GEN QCD Jets 1800-\(\infty\) GeV There is an associated dataset of jets recorded by the CMS detector available on Zenodo: CMS 2011A Jets, pT &gt; 375 GeV
description: {"references": ["P. T. Komiske, E. M. Metodiev, EnergyFlow, https://energyflow.network."]}
DOI: 10.14457/cu.the.2008.1656
title: Using the probability of default as the determinant of firms' capital structure : empirical study in G7 nations

description: This paper studies the effect of credit rating and probability of default, by implying Merton’s model, on firms’ capital structure in G7 nations. The time horizon is 10 year including year 1997 to 2006. Total observations are 6070 observations. More over, this paper study the above variables further with the capital structure theories which are Pecking order theory, Trade off theory, and Market timing theory. The results show that using credit rating to determine firms’ capital structure is decrease in its explanatory power. When test together with the capital structure theories, Trade off theory is able to explain the capital structure while credit rating is unable to explain. Oppositely, Probability of default can be used to explain the capital structure together with Trade off theory. This paper will be the first that use probability of default to observe the signal of securities issuance and will be alternative determinant of firms’ capital structure. Furthermore, this paper motivates future study of applying Merton’s model and probability of default in to other field of financial study.
DOI: 10.14457/cu.the.2008.1657
title: Weakly Regular T-Seminearrings and Simple T-Seminearrings

description: We define a Γ-seminearring as follows. Let (R,+) be a semigroup and Γ a nonempty set. Then R is called a Γ-seminearrng if there exists a mapping RxΓxR→R such that αα(bβc) = (ααb)βc and (α+b)αc = ααc for any α,b,c R and α, β Γ. Notice that Γ-seminearrings are generalization of Γ-nearrings, Γ-semirings and Γ-rings. Furthermore, Γ-seminearrings are generalization of seminearrings which are generalization of nearrings, semirings and rings. The first purpose of this thesis is to study general properties of Γ-seminearrings such as some results involving sub Γ-seminearrings, ideals of a Γ-seminearring and quotient Γ-seminearrings. As we know, regular rings, weakly regular semirings, simple nearrings and 0-simple Γ-rings have been studied. This leads to anotler purpose of this work which is to investigate regular Γ-seminearrings, weakly regular Γ-seminearrings, simple Γ-seminearrings and 0-simpleΓ-seminearrings.
DOI: 10.14457/cu.the.2008.1658
title: Welfare analysis of wastewater treatment charges : a case study of the bangkok metropolitan administration wastewater management system

description: This study objects to introduce the analysis framework of determining and emphasizing the total effects of the environmental policy on net social welfare which is defined as the changes in consumer surplus in household sector together with gains in governmental sector (Bangkok Metropolitan Administration). The study uses Linear Expenditure System (LES) to estimate households demand patterns and Stochastic Frontier Analysis (SFA) to estimate abatement cost of Bangkok’s wastewater treatment plants. The results prove that any policy scenarios encourage net social welfare gains. The author finds that the policy, imposing the charge at 2 baht per m3 without any compensation, creates the most net social welfare gain (4.577 million baht per month) when compared to other scenarios and affects decreasing of wastewater discharged the most equalling to 3.338 percent. Moreover, the revenue neutral scenario that reduces other taxes to compensate households is the most efficiency scenario while using the revenue to fund lump sum transfers actually creates better equity to the society In addition, the results show that BMA designed policy, imposing the charge at 2 baht per m3 without any compensation, impacts lose in household sector 42.579 baht per household per month or the total is 85.159 million baht per month. BMA sector gains from this new source of revenues about 83.870 million baht per month. BMA also benefits from decreasing wastewater discharged by saving its abatement cost about 5.865 million baht per month. Indeed, the wastewater treatment charge creates net social welfare gain in a case study of Bangkok Metropolitan Administration’s wastewater management system.
DOI: 10.14457/cu.the.2008.1659
title: Efficacy and adverse effects of vessel sealing system tonsillectomy vs cold knief tosillectomy : a randomized, control study

description: Objective: To compare efficacy and adverse effects between vessel sealing system tonsillectomy (VSST) and cold knife tonsillectomy (CKT). Study design: randomized, paired-control study Setting: Department of Otolaryngology, King Chulalongkorn Memorial Hospital Research methodology: Twenty three subjects were enrolled. Intervention was randomized and performed by VSST on one side of tonsil and CKT on the other side. Measured outcomes intraoperative blood loss, operative time, postoperative pain scale (FPS-R), postoperative bleeding and other adverse effects assessed daily by blinded assessors until postoperative day 14. Results: Median of blood loss from VSST / CKT / paired difference was 1.00 / 25.00 / 20.00 milliliters (p &lt; 0.01). Mean ± SD of operative time from VSST / CKT / paired difference was 3.70 ± 2.27 / 8.52 ± 4.79 / 4.83 ± 4.60 minutes (95% CI of paired difference = 2.84 – 6.81, p &lt; 0.01), However, there was no significant difference in daily (day0 – day14) postoperative pain (p = 0.10 – 0.96) from Pain Scale between both groups. Generalized estimating equation was used for prediction of pain scale by considering treatment group and postoperative day as independent variables. Postoperative day was statistically significant (p &lt; 0.01) but treatment group was not significant (p = 0.77). Regarding postoperative bleeding, only two cases of delayed postoperative bleeding on the CKT side were found in this study. Conclusion: VSST is better than CKT in terms of efficacy (intraoperative blood loss and operative time) but not different in terms of postoperative pain.