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2018

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Adsorption Of Methane And Carbon Dioxide On Activated Carbon And Metal Organic Frameworks, Chutima Sudsuansi Jan 2018

Adsorption Of Methane And Carbon Dioxide On Activated Carbon And Metal Organic Frameworks, Chutima Sudsuansi

Chulalongkorn University Theses and Dissertations (Chula ETD)

Natural gas has gain popularity for transportation among other fuels since it is the cleanest burning fossil fuel. However, the important challenge for utilizing natural gas is its comparatively low volumetric energy storage density. Consequently, a suitable natural gas storage is needed. Adsorbed natural gas (ANG) is an interesting alternative because it could be expected to reduce the cost and potential damage from compressed natural gas (CNG) and liquefied natural gas (LNG) technology. Comparative adsorption of methane and carbon dioxide on activated carbon ZIF-8, UiO-66, and MIL-53 (Al) was investigated at 35 °C and up to 100 psi. The addition …

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Identification Of Crude Oils And Fuel Oils After Weathering Using Biomarkers, Pyrogenic Index And Asphaltenes Contents, Hathairat Thongkorn Jan 2018

Identification Of Crude Oils And Fuel Oils After Weathering Using Biomarkers, Pyrogenic Index And Asphaltenes Contents, Hathairat Thongkorn

Chulalongkorn University Theses and Dissertations (Chula ETD)

Oil spills have become a global problem. This is one of the serious problems in marine environment. The spills are generally from reservoir zipping, accident or unauthorized drainage. Typically, the spilled oils are fuel oils or crude oils which are difficult to differentiate. After oil spill incident, oils are undergone weathering processes such as evaporation, dissolution, and biodegradation etc., which are main factor of depleting hydrocarbon. This work focuses on the distribution of hydrocarbon and diagnostic ratio of polycyclic aromatic hydrocarbons such as pristane, phytane, phenanthrene, pyrene, chrysene and biomarker in hopane group after weathering processes. Moreover, measuring of Al, …

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Removal Of Mixed Vocs Of Benzene, Toluene, And Xylene By Using Catalytic Corona Discharge System, Issaree Tantiprapa Jan 2018

Removal Of Mixed Vocs Of Benzene, Toluene, And Xylene By Using Catalytic Corona Discharge System, Issaree Tantiprapa

Chulalongkorn University Theses and Dissertations (Chula ETD)

Silver (Ag) and Manganese (Mn) catalysts were loaded on TiO₂ and Al₂O₃ supports on quartz wool that were tested for the oxidation of mixed Volatile Organic Compounds (VOCs) of benzene, toluene, and xylene in nonthermal plasma corona discharge. The total feed concentration of VOCs was fixed at 100 ppm. The catalyst located between the pin and plate electrodes with a constant gap distance of 15 mm and the pin and plate plasma reactor had an inside diameter of 9 mm. The outlet stream was analyzed by gas chromatography equipped with TCD and FID detectors. The operating parameters including applied voltage, …

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Heat Exchanger Network Retrofit Under Fouling Effect, Jaturaporn Yanyongsak Jan 2018

Heat Exchanger Network Retrofit Under Fouling Effect, Jaturaporn Yanyongsak

Chulalongkorn University Theses and Dissertations (Chula ETD)

The energy conservation by heat exchanger network (HEN) is important in process design according to an increase of energy costs and global environmental concerns. To minimize the energy consumption with positive net present value (NPV), the retrofitted HEN plays an important role in process energy systems. The HEN retrofit model is based on stage-wise superstructure by Yee and Grossmann (1990). In addition, fouling deposition on the surface area of heat exchangers causes extra energy consumption, production loss and maintenance costs. The new proposed model is retrofitting HEN with fouling effects. This method achieves HEN with the optimal trade-offs between energy …

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Methane Hydrate Formation And Dissociation : Roles Of Promoters, Kimhak Neak Jan 2018

Methane Hydrate Formation And Dissociation : Roles Of Promoters, Kimhak Neak

Chulalongkorn University Theses and Dissertations (Chula ETD)

Roles of promoters become necessary in methane hydrate formation for the attempt of gas storage application, but some additives might cause unwanted results in gas recovery. The effects of amino acids (l-leucine and l-valine) and surfactants, sodium dodecyl sulfate (SDS), and methyl ester sulfonate (MES) was investigated at 8 MPa and 2 to 4 °C. L-leucine system enhanced hydrate formation because of its surface activity and surface adsorption at interfaces. A noticeable methane uptake yield was also observed in the l-valine solution. Its influences might be from the nature of l-valine that has non-polar, aliphatic hydrophobic side chain resulting in …

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Optimization Of Single Refrigerant Conocophillips Lng Cascade Process, Naken Saetang Jan 2018

Optimization Of Single Refrigerant Conocophillips Lng Cascade Process, Naken Saetang

Chulalongkorn University Theses and Dissertations (Chula ETD)

An LNG cascade process operates under high pressure and extremely low temperature to liquefy natural gas, requiring very high work input to the compressors. This thesis performed the optimization of the single refrigerant ConocoPhillips LNG process by a global optimization technique based on the domain and image partitioning methodology (Faria and Bagajewicz, 2012) to minimize work input to the system. The procedure consists of an NLP upper bound and MILP lower bound models. The lower bound model was formulated by discretizing and linear relaxation of the upper bound non-linear equations by assigning new integer variables and a set of linear …

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Energy And Exergy Analysis For Cryogenic Process Design/Retrofit, Nattawat Threerachannarong Jan 2018

Energy And Exergy Analysis For Cryogenic Process Design/Retrofit, Nattawat Threerachannarong

Chulalongkorn University Theses and Dissertations (Chula ETD)

Energy and Exergy analysis are one of alternative techniques to analyze chemical processes in term of energy quality parameters such as enthalpy, entropy and exergetic temperature. The exergetic temperature can conduct Exergy Composite Curves diagram (ECCs) (Marmolejo-Correa, 2012) which represents exergy targets: exergy requirement, exergy rejection and exergy destruction etc. In addition, these targets can be used for improving processes. The strength points of these analysis are to design the new process and to improve the utility performance. Therefore, these analysis methods have been applied to low-temperature process that requires a large amount of energy consumption. In this work, there …

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Removal Of Mixed Vocs Of Benzene, Toluene And Xylene By A Multistage Corona Discharge System, Nitikorn Ditthawat Jan 2018

Removal Of Mixed Vocs Of Benzene, Toluene And Xylene By A Multistage Corona Discharge System, Nitikorn Ditthawat

Chulalongkorn University Theses and Dissertations (Chula ETD)

The oxidation of mixed volatile organic compounds (VOCs) of benzene, tol-uene and xylene in non-thermal plasma corona discharge was investigated. An initial total VOCs concentration of 100 ppm and feed flow rate of 50.0 ml/min were firstly fixed to investigate the effects of an applied voltage and input frequency on VOCs conversion, power consumption and CO₂ and CO selectivities. For a single stage plasma system, under the optimum applied voltage of 8 kV and input frequency of 500 Hz, the system gave the high CO₂ selectivity with the low CO selectivity and the lowest power consumption. At the optimum operationable …

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Life Cycle Assessment Of End Of Life Strategies For Waste From Petroleum Production, Nuntawat Urairat Jan 2018

Life Cycle Assessment Of End Of Life Strategies For Waste From Petroleum Production, Nuntawat Urairat

Chulalongkorn University Theses and Dissertations (Chula ETD)

The waste treatment and disposal of oil refining industry sector are one of the significant aspects of environmental concerns. Because they are not only generated in substantial amounts, but also contained with various hazardous substances such as waste oils, spent catalysts, and mercury-contaminated materials. This study aimed to develop and evaluate the waste management strategies, from waste generator (WG) to waste processors (WP), using the material flow analysis (MFA, STAN v.2.6.601) and life cycle assessment (LCA, SimaPro v.8.3.0.0) as an assessment tool. The functional unit is the amount of waste generated from six refineries in the year 2015. The waste …

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Effecst Of Water On The Methane Hydrate Formation And Dissociation With Hollow Silica And Activated Carbon, Sarocha Rungrussamee Jan 2018

Effecst Of Water On The Methane Hydrate Formation And Dissociation With Hollow Silica And Activated Carbon, Sarocha Rungrussamee

Chulalongkorn University Theses and Dissertations (Chula ETD)

The porous materials, hollow silica (HSC) and activated carbon (AC), were selected to investigate their effects with water on methane hydrate formation and dissociation. The methane hydrate formation with the porous materials was conducted at 8 MPa and 277 K. The dissociation of hydrates was achieved by thermal stimulation with 294 K temperature driving force. The result showed that the hydrate formation of the system with 1:14 HSC to water ratio, the system with excess water, provided the highest methane consumed and water conversion to hydrates. That is because the HSC has low density allowing it to float on water …

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Heat Exchanger Network Design/Retrofit With Partitioning Technique For Linearization Of Specific Heat Capacity-Temperature Relation, Siwat Valeekiatkul Jan 2018

Heat Exchanger Network Design/Retrofit With Partitioning Technique For Linearization Of Specific Heat Capacity-Temperature Relation, Siwat Valeekiatkul

Chulalongkorn University Theses and Dissertations (Chula ETD)

Heat Exchanger Network (HEN) design has been studied for 40 years starting from heuristic technique; pinch analysis and design method to mathematical programming. The stage-wise superstructure by mathematical programming from Yee and Grossmann (1990) was one of the famous models suitable for industrial HEN design under assumption of constant average specific heat capacity (Cp) which generally should be fitted by empirical form of cubic equation. Zhu and Asante (1999) and Ayotte-Sauvé et al. (2017) used piece-wise linearization called stream segment model, to approximate Cp. Their Cp approximation techniques used high number of piece-wises to calculate Cp accurately. This paper presents …

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Use Of Binary Surfactant Formulations In Low Ift Foam And Surfactant Flood, Sorrawit Tantipalakul Jan 2018

Use Of Binary Surfactant Formulations In Low Ift Foam And Surfactant Flood, Sorrawit Tantipalakul

Chulalongkorn University Theses and Dissertations (Chula ETD)

Viscous fingering and early breakthrough are the main problems observed during the water flooding. These problems could be overcome by using foam flooding by coinjection of surfactant solution and nitrogen gas as a mobility control in a porous media to help improve the sweep efficiency. To gain the maximum benefits of foam flooding, ultra-low interfacial tension foam was studied to obtain a foaming system with high sweep efficiency and at the same time high oil solubilization to help mobilize the oil phase from reservoir rock. In this work, mixed surfactant systems between sodium dioctylsulfosuccinate (AOT) and internal olefin sulfonate (IOS) …

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Conversion Of N-Pentane To Aromatics: Effect Of Surface Modification By Chemical Liquid Deposition And Promoter Over Nano Scale Ga/Hzsm-5, Sukkatad Sintapanin Jan 2018

Conversion Of N-Pentane To Aromatics: Effect Of Surface Modification By Chemical Liquid Deposition And Promoter Over Nano Scale Ga/Hzsm-5, Sukkatad Sintapanin

Chulalongkorn University Theses and Dissertations (Chula ETD)

This work studied the effects of chemical liquid deposition, i.e., TEOS concentration and multicycle silylation on Ga/HZSM-5 on their catalytic performance in aromatization of n-pentane. The parent nano scale HZSM-5 zeolite catalysts were incorporated with Ga by impregnation method followed by silylation via chemical liquid deposition (CLD) using tetraethyl orthosilicate (TEOS) by varying concentrations and number of cycles. Moreover, the small amount of Pt, Zn, La and P was introduced by co-impregnation method to study the effect of promoter. The physical and chemical properties of catalysts were characterized by N2 physisorption, XRD, NH3-TPD, IPA-TPD, TPO, TPR, SEM and 27Al MAS …

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Development Of Lcsoft As A Tool For Life Cycle Assessment Of Environmental Impacts : Incorporating Additional Lcia Methodologies And Environmental Footprint, Tanathip Rattanatum Jan 2018

Development Of Lcsoft As A Tool For Life Cycle Assessment Of Environmental Impacts : Incorporating Additional Lcia Methodologies And Environmental Footprint, Tanathip Rattanatum

Chulalongkorn University Theses and Dissertations (Chula ETD)

Life Cycle Assessment (LCA) is a technique to calculate, assess, and analyze environmental impacts through the entire life cycle of products. LCSoft has been continuously developed as LCA software which has ability to integrate with other software e.g. process simulation software and economic analysis software. In addition, LCSoft has several functions which can analyse various environmental effects such as sensitivity analysis, alternative comparison, and eco efficiency analysis. In this thesis, several features were added into LCSoft to cover a wider application range from users and more industrial technologies. This thesis consists of four main parts. First, adding more essential equipment …

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Furfurylamine-Based Polybenzoxazine Adsorbent For Co2 Capture: Effect Of Carbonization Temperature And Activation Methods, Thanabhumi Vongtiang Jan 2018

Furfurylamine-Based Polybenzoxazine Adsorbent For Co2 Capture: Effect Of Carbonization Temperature And Activation Methods, Thanabhumi Vongtiang

Chulalongkorn University Theses and Dissertations (Chula ETD)

Carbon sorbents are of interest for post-combustion CO₂ capture. Polymers are one of the potential precursors to develop carbon adsorbent with suitable surface functionalities. In this research, furfurylamine-based polybezoxazine was used to produce the carbon adsorbent because of its superior properties such as high char yield, high thermal stability, and low water adsorption. To obtain the carbon adsorbent, benzoxazine monomer was prepared by using furfurylamine, paraformaldehyde, and phenol. Polymerization by a sol-gel technique using xylene as a solvent was employed. The obtained polymer was carbonized at various temperatures: 600, 700, and 800 °C. Physical and chemical activation were then conducted …

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Development Of Group-Contribution Models For Use In Surfactant Selection - Case Studies Of Single And Mixed Surfactant Applications, Woramet Chanachichalermwong Jan 2018

Development Of Group-Contribution Models For Use In Surfactant Selection - Case Studies Of Single And Mixed Surfactant Applications, Woramet Chanachichalermwong

Chulalongkorn University Theses and Dissertations (Chula ETD)

Microemulsion is the surfactant/oil/water system that is applied to many applications such as enhanced oil recovery, cleaning agents, environmental remediation and drug delivery system. To select the suitable surfactant to form an efficient microemulsion system for each specific condition and application, a systematic selection method is needed to reduce time and valuable resources that may be required in the design of an interest product. This work developed a systematic method to select suitable surfactants for a specific application based on several properties including but not limited to types of emulsion, emulsion stability, solubility and toxicology. Since not all models are …

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Taxonomy And Secondary Metabolites Of Selected Endophytic Actinomycete Strains, Nattakorn Kuncharoen Jan 2018

Taxonomy And Secondary Metabolites Of Selected Endophytic Actinomycete Strains, Nattakorn Kuncharoen

Chulalongkorn University Theses and Dissertations (Chula ETD)

A total of 50 endophytic actinomycetes isolated from fourteen plant species collected from six provinces of Thailand including Bangkok, Chachoengsao, Chiang Mai, Nakhon Pathom, Prachinburi and Suphan Buri were taxonomically studied relied on their phenotypic and chemotaxonomic characteristics, and the 16S rRNA gene sequence analysis. The isolates were identified as members of the family Streptomycetaceae involving Streptomyces (22 isolates), and the family Micromonosporaceae including Micromonospora (25 isolates), Plantactinospora (1 isolate) and Polymorphospora (1 isolate). Based on phenotypic characteristics, whole genome sequence analysis and DNA-DNA hybridization, 5 novel actinomycete species were proposed consisting of Micromonospora globbae (strain WPS1-2T), Micromonospora azadirachtae (strain …

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Novel (Cu-Sn) And (Ni-Sn) Catalysts Prepared By Mechanical Alloying, Sakollapath Pithakratanayothin Jan 2018

Novel (Cu-Sn) And (Ni-Sn) Catalysts Prepared By Mechanical Alloying, Sakollapath Pithakratanayothin

Chulalongkorn University Theses and Dissertations (Chula ETD)

This research was aimed to synthesize intermetallic catalysts using mechanical alloying (Ma) technique. Copper (Cu) and nickel (Ni) were chosen to study since not only their properties are closed to the noble metal properties, e.g. platinum and palladium, but also they are not expensive. However, as also found in noble metals, both Cu and Ni metals are oxidized easily in air. To overcome this problem, either Cu or Ni was mixed with tin (Sn) to obtain bimetallics, viz. CuSn or NiSn, respectively. Therefore, this research was focused on finding the optimal conditions to synthesize both CuSn and NiSn bimetallics using …

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Light Responsive With Metallo-, And Hydrogen Bonded Benzoxazine Dimer-Based Supramolecular Structure, Sorapat Niyomsin Jan 2018

Light Responsive With Metallo-, And Hydrogen Bonded Benzoxazine Dimer-Based Supramolecular Structure, Sorapat Niyomsin

Chulalongkorn University Theses and Dissertations (Chula ETD)

The present work focuses on multi-responsive molecule based on supramolecular chemistry of benzoxazine dimer as a benzoxazine supramolecular crosslinker, fluorescent labelling benzoxazine conjugated with rotaxane system and benzoxazine pendant group block copolymer. The use of azobenzene derivatives in benzoxazine synthesis provides light responsive behaviour. The remained hydroxyl group from aminoalcohol allows benzoxazine to conjugate with desired functional group. The dihydroxyl benzoxazine acts as molecular crosslinker for poly(acrylic acid) by conjugation. The ring-opening reaction brings benzoxazine dimeric unit on the crosslinker which also showed metal ion complexation. The complexation strengthens the cross-linked polymer network. The complex can reversely form by treating …

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Catalytic Applications Of Cuo Loaded Mesoporous Ceo₂ And Cuo Loaded Mesoporous Ceo₂-Zro₂ Catalyst, Sureerat Jampa Jan 2018

Catalytic Applications Of Cuo Loaded Mesoporous Ceo₂ And Cuo Loaded Mesoporous Ceo₂-Zro₂ Catalyst, Sureerat Jampa

Chulalongkorn University Theses and Dissertations (Chula ETD)

Copper oxide (CuO) loaded mesoporous ceria (CeO₂) and Copper oxide (CuO) loaded mesoporous ceria-zirconia (CeO₂-ZrO₂) catalysts are successfully synthesized for preferential oxidation of CO (CO-PROX) and autothermal steam reforming of methanol (ASRM). Mesoporous CeO₂ and mesoporous CeO₂-ZrO₂ as catalyst supports with high specific surface area and ordered structure are prepared via a nanocasting process by using MCM-48 as template. Deposition-precipitation technique is chosen to load various Cu contents (1 to 9 wt.%) on the synthesized mesoporous supports. The synthesized CuO loaded mesoporous CeO₂ (Cu-C) and CuO loaded mesoporous CeO₂-ZrO₂ (Cu-CZ) catalysts are characterized by N₂ adsorption-desorption, X-ray diffraction, transmission electron …

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Development Of Composite Polyelectrolyte Complex Membrane For Cationic Dye And Heavy Metal Sorption, Wanwanut Chueasupcharoen Jan 2018

Development Of Composite Polyelectrolyte Complex Membrane For Cationic Dye And Heavy Metal Sorption, Wanwanut Chueasupcharoen

Chulalongkorn University Theses and Dissertations (Chula ETD)

The sorption process is most useful in water treatment because it provides high sorption efficiency, low cost and rapid method. Polyelectrolyte complex (PECs) is a novel polymeric membrane prepared by mixing between oppositely charged polyelectrolyte solution of PDADMAC and PSS. Activated carbon (ACs) is used to improved adsorption efficiency in PECs. Non-stoichiometric PDADMAC/PSS membrane were prepared by mixing excess PSS concentration to get the negative charges on the membrane surface. Sorption efficiency was evaluated by methylene blue, cationic dye and heavy metal ions based on the same material, the difference sorption mechanism were observe. In the cationic dye, the adsorption …

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Thermomechanical Behavior And Chemical Sensing Cationic Poly(Diallyldimethylammonium Chloride) And Anionic Poly(Sodium 4-Styrene Sulfonate) Assembled Into Composite Polyelectrolyte Multilayer Thin Films And Complex Membranes, Rateeya Saikaew Jan 2018

Thermomechanical Behavior And Chemical Sensing Cationic Poly(Diallyldimethylammonium Chloride) And Anionic Poly(Sodium 4-Styrene Sulfonate) Assembled Into Composite Polyelectrolyte Multilayer Thin Films And Complex Membranes, Rateeya Saikaew

Chulalongkorn University Theses and Dissertations (Chula ETD)

Polyelectrolyte composite membranes of cationic PDADMAC and anionic PSS assembled into polyelectrolyte multilayer (PEM) thin film and polyelectrolyte complex (PEC) membranes were used as matrix embedded with several additive molecules. Nano-scale PEM films fabricated using the layer-by-layer deposition method and the loading and release of a hydrophobic model drug curcumin (Cur) was studied for drug delivery and sensing applications. Interestingly, it was found that the loading and release of Cur could be triggered by solvent composition and temperature. In a parallel study, the alternative to the nanoscale PEM was studied in the form of PEC, which were used as stand-alone …

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Prevalence And Factors Associated With Safe Sex Behaviors Among Adolescent Vocational Students In Nakhon Ratchasima Province, Thailand, Maneebongkot Chaumaroeng Jan 2018

Prevalence And Factors Associated With Safe Sex Behaviors Among Adolescent Vocational Students In Nakhon Ratchasima Province, Thailand, Maneebongkot Chaumaroeng

Chulalongkorn University Theses and Dissertations (Chula ETD)

Background: Premature sexual intercourse among adolescent can be linked to HIV and sexual transmitted diseases and unintended pregnancy. This study aimed to determine the prevalence and factors associated with safe sex behaviors among adolescent vocational students in Nakhn Ractchasima province, Thailand. Methods: A cross-sectional analytical study(n=332) was conducted from August-October 2018 by using self-administered questionnaire. Bivariate (Chi-square test) and multivariate analysis ( logistic regression) were performed to identified the factors associated with safe sex behaviors among adolescent vocational students in Nakhon Ratchasima province, Thailand. Results: finding revealed that the participants were male 57.8% and female 42.2%with an average age of …

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Sexual Risk Behaviors And Sexual Harassment Among Female Beer Promoters In Chiang Mai Province, Thailand, Mathudara Phaiyarom Jan 2018

Sexual Risk Behaviors And Sexual Harassment Among Female Beer Promoters In Chiang Mai Province, Thailand, Mathudara Phaiyarom

Chulalongkorn University Theses and Dissertations (Chula ETD)

Beer promoters can be found throughout the country and Chiang Mai after alcohol drinks advertising was illegal according to Alcohol Beverage Control Act. From their working conditions, they are faced with sexual harassment and encourage to drink with clients which probably leads to sexual risk behaviors. There are few evidence-based researches about their sexual risk behaviors and sexual harassment so it is hard to solve these situations. This study aimed to determine their demographic data, sexual activities, attitudes, working conditions, sexual risk behaviors, and sexual harassment female beer promoters in Chiang Mai. Moreover, it aimed to find the association between …

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Robotic Health Monitoring Program For Fall Prevention In Elderly : Quasi-Experimental Study, Natthawadee Maneeprom Jan 2018

Robotic Health Monitoring Program For Fall Prevention In Elderly : Quasi-Experimental Study, Natthawadee Maneeprom

Chulalongkorn University Theses and Dissertations (Chula ETD)

Purpose: To develop and investigate effectiveness of robotic fall prevention program on knowledge score of fall prevention, number of exercises, balance score, and incident of fall among elderly at risk of fall residing in senior housings, Bangkok Thailand. Methods: This was a quasi-experimental study with repeated measured. Sixty-four elderly in two senior housings in Bangkok with Barthel Index (BI) scale ≥12, either had at least one fall experience in the past 12 months and/or had Time Up and Go (TUG) test ≥20 seconds were recruited and purposively assigned to the intervention group (a small robot installed fall prevention software, with …

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Factors Related To Quality Of Life Among The Caregivers Of End Stage Renal Disease (Esrd) Patients Undergoing Hemodialysis In Yangon, Myanmar, Naw Wah Ka Paw Jan 2018

Factors Related To Quality Of Life Among The Caregivers Of End Stage Renal Disease (Esrd) Patients Undergoing Hemodialysis In Yangon, Myanmar, Naw Wah Ka Paw

Chulalongkorn University Theses and Dissertations (Chula ETD)

Background: Caring for the patients with chronic diseases are not an easy task. End stage renal disease is one of the chronic diseases and the patients suffering from these disease needs lifelong hemodialysis treatment. Caregivers of hemodialysis patients encounter lots of pressures in taking care of their loved ones with chronic conditions. It could negatively affect all aspects of their health including their quality of life. Diminish quality of life could increase their pressures or burdens and interfere with the proper patient care. Thus, the present study was designed to examine the characteristics of caregivers and patients undergoing hemodialysis, the …

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The Influence Of Indoor Air Pollution Sources On Respiratory Health Of Occupants In Offices : A Cross-Sectional Study At Suan Sunandha Rajabhat University, Bangkok, Thailand, Thammarak Srimarut Jan 2018

The Influence Of Indoor Air Pollution Sources On Respiratory Health Of Occupants In Offices : A Cross-Sectional Study At Suan Sunandha Rajabhat University, Bangkok, Thailand, Thammarak Srimarut

Chulalongkorn University Theses and Dissertations (Chula ETD)

Background: Indoor air pollution contains several substances and can emanate from a range of sources. In particular importance might be substances known as volatile organic compounds and respirable particulates. The exposure to indoor air pollution can induce a wide range of acute and chronic respiratory health effects. The study's aims were to identify the effect of indoor air pollution sources and concentrations in offices on respiratory health of occupants and identify potential factors that may be related to respiratory health problems. Methods: Fourteen offices were measured the concentration of PM2.5 and TVOC at 1.20 meters high for 8 hours and …

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Personal Branding Strategies Of Influential Youtubers And Perceptions Of Thai Millennials Toward Them, Chanamon Phansab Jan 2018

Personal Branding Strategies Of Influential Youtubers And Perceptions Of Thai Millennials Toward Them, Chanamon Phansab

Chulalongkorn University Theses and Dissertations (Chula ETD)

Personal branding—how individuals establish and communicate their unique traits and skills to facilitate their life goals—has become a topic of interest for many scholars and practitioners alike. One of the most widely used channels through which personal branding is executed is YouTube. There are several YouTubers, as we speak, who strive to promote their channel—their personal brand—by establishing their online identity and communicating such identity to their target audience. The studies have shown that the main target audience on YouTube, whose rising influence boosts the popularity of online video content viewing, is the millennials, especially Thai millennials as Thailand is …

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Innovation Of Gonadotropin Releasing Hormone (Gnrh)-Modified Nanocarrier Delivered To Induce Testicular And Mammary Cell Apoptosis, Chatwalee Boonthum Jan 2018

Innovation Of Gonadotropin Releasing Hormone (Gnrh)-Modified Nanocarrier Delivered To Induce Testicular And Mammary Cell Apoptosis, Chatwalee Boonthum

Chulalongkorn University Theses and Dissertations (Chula ETD)

The main overall goal of this study is to investigate the application of modified chitosan as a potential vector for apoptotic gene delivery to gonadotropin-releasing hormone receptor (GnRHR)-expressing cells (i.e. testicular cells and mammary cancer cells). This study reported Gonadotropin Releasing Hormone-modified Chitosan (GnRH-CS) nanoparticle as a promising vector for targeted gene delivery, and a GnRH peptide was used for active targeting of a transgene in GnRHR expressing cells. The physiological characterizations of the prepared nanoparticle were investigated by proton nuclear magnetic resonance spectroscopy (1H NMR), Attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) and Nanosizer. The prepared GnRH-CS was …

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Appropriate Campylobacter Detection Method And Genetic Variation Of Campylobacter Jejuni In Broilers, Natnicha Phetsri Jan 2018

Appropriate Campylobacter Detection Method And Genetic Variation Of Campylobacter Jejuni In Broilers, Natnicha Phetsri

Chulalongkorn University Theses and Dissertations (Chula ETD)

Campylobacter has been known as an important cause of gastroenteritis in humans. The primary source is raw or undercooked poultry meat. Previous study showed that Campylobacter isolated from slaughterhouses were associated with Campylobacter isolated from broiler farms. Thus, detection of Campylobacter flock status and sorting flocks prior to slaughtering processes may help prevent Campylobacter contamination between Campylobacter-positive and negative flocks during slaughtering processes. Unfortunately, appropriate sample type and isolation method have not been clearly specified for Campylobacter detection at the farm level. Because Campylobacter are fastidious bacteria, improper detection method can attribute to false negative results. Therefore, the objectives of …

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