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2019

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Building Trust Through Innovative Trust Building Process : The Case Of Organic Food Market In Thailand, Supranee Tangnatthanakrit Jan 2019

Building Trust Through Innovative Trust Building Process : The Case Of Organic Food Market In Thailand, Supranee Tangnatthanakrit

Chulalongkorn University Theses and Dissertations (Chula ETD)

The organic food industry is currently faced with challenges of consumer mistrust due to the current food supply chain issues concerning the reliability of information, supply chain transparency, product quality, logistic issues, environmental impact, fraud, and food safety. Although receiving certification from the authorized institutions is one way of building consumer trust, it remains a cumbersome process. In addition, consumers are increasingly looking to develop trust through other sources, such as searching for information that relates to the reputation of the retailers or the credibility of the producers. While trust has been generally defined in previous trust-related studies as the …

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Management For Publicizing Thai Dance In A Foreign Country : The Case Study Of Lor (Love, Obsession, Revenge) Performed At Fei & Milton Wong Experimental Theatre, Canada, Nawarit Rittiyotee Jan 2019

Management For Publicizing Thai Dance In A Foreign Country : The Case Study Of Lor (Love, Obsession, Revenge) Performed At Fei & Milton Wong Experimental Theatre, Canada, Nawarit Rittiyotee

Chulalongkorn University Theses and Dissertations (Chula ETD)

The objective of this research was to study and to shape concepts in the management for publicizing Thai dance in a foreign country. This study employed Love, Obsession, Revenge, or shortly, LOR as a case study and this Thai dance had already been performed at the Fei & Milton Wong Experimental Theatre, Simon Fraser University, Canada. Autoethnography methodology was applied as the research method in this study as the researcher was part of the team. Nineteen observations were conducted and analyzed by comparing and contrasting theories and personal experiences. The findings revealed that partnership with international organization facilitated management for …

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Single Fixed-Time Artificial Insemination With Fresh Or Frozen Thawed Semen In Pig, Pachara Pearodwong Jan 2019

Single Fixed-Time Artificial Insemination With Fresh Or Frozen Thawed Semen In Pig, Pachara Pearodwong

Chulalongkorn University Theses and Dissertations (Chula ETD)

Single fixed-time AI is the breeding protocol inseminating the sows once with either fresh or frozen-thawed (FT) semen at fixed time after ovulation induction without estrus detection. To develop the success single fixed-time AI protocol in Thailand, factors affecting the efficacy of single fixed-time AI were evaluated. Additionally, we also evaluated the effect of using lecithin in cryopreservation extender on FT semen qualities in order to find the possibility to perform single fixed-time AI using sperm preserved in lecithin based extender. It was found that administration of 10 ug buserelin at 72 h after weaning decreased weaning-to-ovulation interval compared to …

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Development Of An Indirect Elisa To Detect Antibodies Against Actinobacillus Suis Using Boiled Whole Cell Antigen, Siriluck Juntautsa Jan 2019

Development Of An Indirect Elisa To Detect Antibodies Against Actinobacillus Suis Using Boiled Whole Cell Antigen, Siriluck Juntautsa

Chulalongkorn University Theses and Dissertations (Chula ETD)

Actinobacillus suis is considered an opportunistic pathogen in swine that can cause disease in animals of all ages, especially in high health status herds. The objective of this study was to developed an indirect enzyme-linked immunosorbent assay (ELISA) using boiled whole cell antigen for the detection of antibody against A. suis. The selected herd has clinical problems associated with A. suis infection. In addition, this herd was not received any Actinobacillus pleuropneumoniae (APP) vaccine nor diagnosed with APP infection before the study. The isolation of A. suis was recovered from lung of the infected pig in the selected herd. Moreover, …

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Short Term Effects Of Sildenafil In Treatment Of Pulmonary Hypertension In Degenerative Mitral Valve Disease Dogs, Karun Saetang Jan 2019

Short Term Effects Of Sildenafil In Treatment Of Pulmonary Hypertension In Degenerative Mitral Valve Disease Dogs, Karun Saetang

Chulalongkorn University Theses and Dissertations (Chula ETD)

Degenerative mitral valve disease (DMVD) is the most common acquired cardiac disease in small breed dogs. Pulmonary hypertension (PH) is a common complication in DMVD that can worsen the clinical signs, cardiac function, and median survival time of DMVD dogs. Conventional therapy of DMVD can reduce systolic pulmonary arterial pressure (sPAP) minimally. Thus, additional therapy is required. Sildenafil is used to treatment of PH in various causes, but the effect of sildenafil in the treatment of PH secondary to DMVD is not published yet. Therefore, this study aimed to evaluate the effects of sildenafil in combination with conventional therapy in …

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Institutional Dynamics And Adaptive Capacity In World Heritage Management: Case Studies From Southeast Asia, Montira Unakul Jan 2019

Institutional Dynamics And Adaptive Capacity In World Heritage Management: Case Studies From Southeast Asia, Montira Unakul

Chulalongkorn University Theses and Dissertations (Chula ETD)

Over the past 40 years, heritage site management institutions have had to contend with expanding “boundaries of practice”: the evolution of heritage concepts and the emergence of global and transnational threats and broader sustainable development issues. Yet, many heritage site management institutions are still mired in conventional heritage mandates and approaches. This study looks at the ability of World Heritage site management institutions to adapt to this changing landscape. Global monitoring exercises show that World Heritage sites are struggling with this increased complexity, with many sites under active monitoring, sometimes for years. The sluggishness of change suggests that a deeper …

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The Invention Of Plastic Plate For The Semiquantitative Detection Of Somatic Cells In Farm Bulk Tank Milk, Piyarat Jiarpinitnun Jan 2019

The Invention Of Plastic Plate For The Semiquantitative Detection Of Somatic Cells In Farm Bulk Tank Milk, Piyarat Jiarpinitnun

Chulalongkorn University Theses and Dissertations (Chula ETD)

Bulk tank milk somatic cell count (BTM SCC) is worldwide acceptable as an indicator of subclinical mastitis and milk quality at the farm level. Several countries determine the BTM SCC level for quality control and milk pricing. In Thailand, BTM SCC standard is set at 500,000 cells/ml and premium milk quality is set at less than 100,000 cells/ml. Milk collecting centers (MCCs) use CMT (California Mastitis Test) for screening raw milk quality. However, CMT has an error and high variation. This study aims to invent a new semiquantitative device for determining BTM SCC and to validate the device in comparison …

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Assessment Of Left Atrial Function In Feline Hypertrophic Cardiomyopathy By Using Two Dimensional Speckle Tracking Echocardiography, Arisara Kiatsilapanan Jan 2019

Assessment Of Left Atrial Function In Feline Hypertrophic Cardiomyopathy By Using Two Dimensional Speckle Tracking Echocardiography, Arisara Kiatsilapanan

Chulalongkorn University Theses and Dissertations (Chula ETD)

Hypertrophic cardiomyopathy (HCM) is one of the most common myocardial diseases in cats. The left atrial (LA) function plays an essential role in compensatory mechanism of left ventricle with diastolic dysfunction to maintain cardiac output in cats affected with HCM. Nowadays, there are several echocardiographic techniques used to evaluate the left atrial function; however, each technique has limitations. To overcome the limitations, two-dimensional speckle tracking echocardiography (2D-STE) is a novel technique for assessment the LA function. To date, no study focusing on assessment of the left atrial function by 2D-STE in feline HCM has been reported. The objective of this …

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Vector Competence Of Culex Tritaeniorhynchus For Duck Tembusu Virus, Jitra Sanisuriwong Jan 2019

Vector Competence Of Culex Tritaeniorhynchus For Duck Tembusu Virus, Jitra Sanisuriwong

Chulalongkorn University Theses and Dissertations (Chula ETD)

Duck Tembusu virus (DTMUV), an emerging infectious disease in ducks, belongs to the Ntaya virus group of the Flavivirus genus in the Flaviviridae family. The emergence of DTMUV has been observed in layer and breeder duck farms in China since 2010 and in layer and broiler duck farms in Thailand since 2013. Infected ducks show neurologic signs, including an incapability to stand, ataxia, and paralysis. A significant drop in egg production is usually observed among layer ducks. The transmission of DTUMV involves mosquito vectors, however, the exact role of mosquitoes in the ecology of DTMUV in Thailand remains unclear. The …

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Development Of Mucoadhesive Nanovaccine Against Columnaris Disease In Red Tilapia (Oreochromis Sp.), Sirikorn Kitiyodom Jan 2019

Development Of Mucoadhesive Nanovaccine Against Columnaris Disease In Red Tilapia (Oreochromis Sp.), Sirikorn Kitiyodom

Chulalongkorn University Theses and Dissertations (Chula ETD)

Tilapia (Oreochromis sp.) is very important and high production of freshwater fish in Thailand. Columnaris disease has been now recognized as one of the most serious infectious diseases in farmed tilapia. The disease is caused by Flavobacterium columnare. Among the prevention and control strategies, vaccination is one of the most effective approach. According to the pathogenesis of this bacteria, the characteristic lesion is almost at mucosal area of skin and gill. Therefore, hypothesized that the mucosal nanovaccine with mucoadhesive characteristic could be suitable vaccination method to control columnaris disease. In this study, we determined vaccine strain candidate by clinical field …

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Epidemiological Surveillance Of Feline Morbillivirus Infection In The Aspects Of Polymerase Chain Reaction, Indirect Elisa And Immunohistochemistry, Surangkanang Chaiyasak Jan 2019

Epidemiological Surveillance Of Feline Morbillivirus Infection In The Aspects Of Polymerase Chain Reaction, Indirect Elisa And Immunohistochemistry, Surangkanang Chaiyasak

Chulalongkorn University Theses and Dissertations (Chula ETD)

Feline morbillivirus (FeMV), a relatively new virus, has been discovered in domestic cats and associated with kidney diseases since 2012 in Hong Kong. The FeMV study gained widely attentions in many countries whereas the pathogenesis remains elusive. These studies aimed to provide the FeMV knowledge in Thai domestic cat by performing the genetic-based, serological-based and pathological-based studies of FeMV-infected in Thai cats. Additionally, the indirect enzyme linked immunosorbent assay (ELISA) and rabbit polyclonal antibody against FeMV matrix (FeMV-M) protein was produced for seroprevalence and viral localization by immunohistochemistry (IHC) techniques, respectively. Our results revealed the FeMV RNA prevalence at 11.9% …

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Evidence Of Vertical And Horizontal Transmission Of Francisella Noatunensis Subsp. Orientalis In Hybrid Red Tilapia (Orerochromis Sp.), Vuong Viet Nguyen Jan 2019

Evidence Of Vertical And Horizontal Transmission Of Francisella Noatunensis Subsp. Orientalis In Hybrid Red Tilapia (Orerochromis Sp.), Vuong Viet Nguyen

Chulalongkorn University Theses and Dissertations (Chula ETD)

Francisellosis caused by Franciscella orientalis (formerly named: Franciscella noatunensis subspecies orientalis) has been reported as one of the most important emergent diseases of warm water fish. However, little is known about its transmission, fastidious nature, survival, and persistence in multiple environments and global presence. This study aims to investigate vertical transmission, horizontal transmission by vectors and effect of other organisms on the outbreak of francisellosis in hybrid red tilapia. To prove the transmission of F. orientalis from subclinically infected tilapia mouthbrooders to their offspring through the current practice of fry production in tilapia hatcheries, experimentally infected hybrid red tilapia broodstock …

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Detection On The Expression Of The Transcription Factors: Oct-4, Nanog, And Sox-2 Genes In Canine Cutaneous Mast Cell Tumors, Sirilak Meesuwan Jan 2019

Detection On The Expression Of The Transcription Factors: Oct-4, Nanog, And Sox-2 Genes In Canine Cutaneous Mast Cell Tumors, Sirilak Meesuwan

Chulalongkorn University Theses and Dissertations (Chula ETD)

The objectives of this study were to determine the expression of Oct-4, Nanog, and Sox-2 in both mRNA and proteins levels. The 30 biopsied MCT cases, from the Small Animal Teaching Hospital, Faculty of Veterinary Science, Chulalongkorn University, were used in this study. The samples were divided into two parts; part I, the biopsied samples were processed for paraffin section and stained with H&E stain, for grading based on Patnaik’s system and Kiupel’s system and the other part was detected the expression of Oct-4, Nanog, and Sox-2 genes. The MCT samples were classified into three grades; grade I, II, and …

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Correlation Of Allergen Specific Immunoglobulin To House Dust Mites And Commensal Microbes In Atopic Dogs And Identification Of Major Allergen In Dermatophagoides Farinae, Nathrada Khantavee Jan 2019

Correlation Of Allergen Specific Immunoglobulin To House Dust Mites And Commensal Microbes In Atopic Dogs And Identification Of Major Allergen In Dermatophagoides Farinae, Nathrada Khantavee

Chulalongkorn University Theses and Dissertations (Chula ETD)

To confirm a causative allergen in atopic dogs could test through intradermal skin testing (IDT) or allergen-specific IgE serology testing (ASIS). ASIS is more practical, convenient and safer. However, the results of ASIS could be affected by source and type of allergen. Crude allergen extracts were still used in commercial testing and protein antigens of skin microbes were not included in the panel of testing. In this study, our group developed serology test for confirming house dust mite allergy called Dermatophagoides farinae and D. pteronyssinus, and measuring specific immunoglobulin to skin microbes on dogs like Malssezia pachydermatis yeast and Staphylococcus …

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Risk Assessment Of Vibrio Parahaemolyticus In White Shrimp (Litopenaeus Vannamei) From Retail Market, Praphatsorn Yokyingyong Jan 2019

Risk Assessment Of Vibrio Parahaemolyticus In White Shrimp (Litopenaeus Vannamei) From Retail Market, Praphatsorn Yokyingyong

Chulalongkorn University Theses and Dissertations (Chula ETD)

Vibrio parahaemolyticus is the leading cause of seafood borne gastroenteritis in many countries including Thailand. It is a gram-negative, halophilic bacterium which was normally found in estuarine environment and seafood. The infection usually occurred from consuming raw, inadequate cooked, or cross-contaminated seafood. Risk assessment is a scientific tool to evaluate health hazard from V. parahaemolyticus infection. In this study, a risk of V. parahaemolyticus infection from raw shrimp consumption (Litopenaeus vannamei) was conducted. This study estimated the prevalence and level of V. parahaemolyticus in 2 retail types across 6 provinces nationwide by 3-tubes MPN. Risk assessment from raw shrimp consumption …

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Monitoring Of Influenza A Viruses In Thailand And Pathogenicity In Dogs And Guinea Pigs, Ratanaporn Tangwangvivat Jan 2019

Monitoring Of Influenza A Viruses In Thailand And Pathogenicity In Dogs And Guinea Pigs, Ratanaporn Tangwangvivat

Chulalongkorn University Theses and Dissertations (Chula ETD)

Influenza A virus causes respiratory disease in many species such as birds, horses, pigs, dogs and cats as well as humans. This thesis consists of 5 phases. Phases 1 was monitoring of canine influenza virus infection in Thailand. Phase 2 was determining the intravenous pathogenicity index of Thai canine influenza virus. Phase 3, 4 and 5 were investigating the pathogenicity of canine influenza viruses in dogs, chickens and guinea pigs, respectivly. Our results showed that 0.97% of canine serum samples (9/932) and 1.20% of feline serum sample (1/79) were tested positive for influenza A antibodies by NP-ELISA. Six serum samples …

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Genetic Characteristics Of Avian Influenza A Viruses Isolated From Thai Free-Grazing Ducks And Their Pathogenicity Potential In Animal Models, Supassama Chaiyawong Jan 2019

Genetic Characteristics Of Avian Influenza A Viruses Isolated From Thai Free-Grazing Ducks And Their Pathogenicity Potential In Animal Models, Supassama Chaiyawong

Chulalongkorn University Theses and Dissertations (Chula ETD)

Influenza A viruses (IAVs) can infect several animal species and humans. In Thailand, free-grazing ducks are reservoir hosts of influenza A virus. The free-grazing ducks are potentially interface with wild birds and domestic birds and subsequently cause interspecies transmission of IAVs. This thesis composes of three study phases. Phase 1 is surveillance of influenza A in free-grazing ducks. Phase 2 is genetic characterization and diversity analysis of influenza A viruses from free-grazing ducks. Phase 3 is challenge of influenza A viruses isolated from free-grazing ducks in animal models. For phase 1, multi-years surveillance of IAVs in free-grazing ducks was conducted …

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Detection And Study Of Genetic Diversity Of Selected Vector-Borne Protozoa And Rickettsia In Buffaloes In Thailand By Biomolecular Method, Hoang Lan Anh Nguyen Jan 2019

Detection And Study Of Genetic Diversity Of Selected Vector-Borne Protozoa And Rickettsia In Buffaloes In Thailand By Biomolecular Method, Hoang Lan Anh Nguyen

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study aimed to determine the occurrence, geographical distribution and genetic diversity of tick and mosquito-borne protozoa and rickettsia in buffaloes by the PCR – sequencing approach. A total of 456 blood samples were collected in provinces of Thailand including Mukdahan, Uthai Thani, Lampang, Amnat Charoen, Nong Bua Lamphu, Phatthalung, Surin and Chachoengsao. DNA was extracted from buffalo blood and screened for the presence of pathogens, followed by sequencing. The results indicated that the overall prevalence of rickettsia, protozoa, and malaria were 41%, 25.4%, and 12.9% respectively. Double and triple infection of buffaloes with pathogens were observed in 19.1% of …

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Genetic Characterization Of Canine Parvovirus And Circovirus In Dogs In Vietnam, Nguyen Manh Tuong Jan 2019

Genetic Characterization Of Canine Parvovirus And Circovirus In Dogs In Vietnam, Nguyen Manh Tuong

Chulalongkorn University Theses and Dissertations (Chula ETD)

Canine parvovirus (CPV-2) emerged and caused severe enteritis in dogs since the 1970s. The last variant, CPV-2c is considered as the high virulent strain and spread ubiquitous worldwide. This strain was early detected in Vietnam since 2002, but the whole genome is still fragmentary. In this study, we attempted to gain the whole genome of CPV-2c from the Vietnamese infected dogs as the first report of the full-length CPV-2c sequence originated from Asia. The Vietnamese CPV-2c exhibited the common mutations in both structural and nonstructural proteins and shared a typical evolutionary pattern with Asian strains. Besides, Vietnamese sequences presented some …

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Effect Of Fish Antifreeze Protein Type Iii Supplementation To Semen Extender On Cryopreserved Dog Spermatozoa, Rudal Jetta Bayusalaksa Jan 2019

Effect Of Fish Antifreeze Protein Type Iii Supplementation To Semen Extender On Cryopreserved Dog Spermatozoa, Rudal Jetta Bayusalaksa

Chulalongkorn University Theses and Dissertations (Chula ETD)

Ice binding protein such as antifreeze protein (AFP) type III have been used as a cryoprotectant and proven to improve sperm survival in some species but dog. Addition of Equex STM paste to semen freezing medium provides beneficial effects on cryopreserved dog sperm. Hence, the objectives of this study were to (a) evaluate the effects of AFP (Experiment I) and (b) its combination with Equex STM paste on cryopreserved dog spermatozoa (Experiment II). The semen samples were pooled to allow for a sufficient number of sperm and to reduce an individual variation. Only sperm-rich fractions with total motility more than …

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Establishment Of Encapsulated Human Dental Pulp Stem Cell-Derived Insulin Producing Cells (Hdpsc-Ipcs) For Translational Stem Cell Based Diabetes Therapy, Suryo Kuncorojakti Jan 2019

Establishment Of Encapsulated Human Dental Pulp Stem Cell-Derived Insulin Producing Cells (Hdpsc-Ipcs) For Translational Stem Cell Based Diabetes Therapy, Suryo Kuncorojakti

Chulalongkorn University Theses and Dissertations (Chula ETD)

Current approach for diabetes treatment remained several adverse events varied from gastrointestinal to life-threatening symptoms. Regenerative therapy regarding Edmonton protocol has been facing serious limitations involving protocol efficiency and safety. This led to the study for alternative insulin-producing cell (IPC) resource and transplantation platform. In this study, evaluation of encapsulated human dental pulp stem cell (hDPSC)-derived IPCs (hDPSC-IPCs) by alginate (ALG) and pluronic F127-coated alginate (ALGPA) was performed. The results showed that ALG and ALGPA preserved hDPSC viability and allowed glucose and insulin diffusion in and out. ALG- and ALGPA-encapsulated hDPSC-IPCs maintained viability for at least 336 hours and sustained …

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Detection And Differentiation Of Haemosporidian Parasites In Chickens (Gallus Gallus Domesticus) Using Molecular Diagnostic Approach, Thi Xuan Mai Nguyen Jan 2019

Detection And Differentiation Of Haemosporidian Parasites In Chickens (Gallus Gallus Domesticus) Using Molecular Diagnostic Approach, Thi Xuan Mai Nguyen

Chulalongkorn University Theses and Dissertations (Chula ETD)

Haemosporidioses in domestic chicken (Gallus gallus domesticus) are not only widely distribute but causing high mortality and non-specific symptoms. The multiplex PCR assay developed in this study can concurrently detect and differentiate four haemosporidian parasites Leucocytozoon caulleryi, Leucocytozoon sabrazesi, Plasmodium juxtanucleare, and Plasmodium gallinaceum. Comparing to microscopic examination performed in parallel on 157 samples, multiplex PCR assay exhibited significantly higher detection rate in diagnosis of haemosporidians (p = 0.000). The results showed that, L. sabrazesi, P. juxtanucleare, and P. gallinaceum detection rate of multiplex PCR were all higher than that of microscopic examination with p = 0.002, 0.000, and 0.004, …

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Resistome Analysis Of Aeromonas Veronii Strains Isolated From Diseased Outbreak In Tilapia Farms In Thailand, Rungnapa Sakulworakan Jan 2019

Resistome Analysis Of Aeromonas Veronii Strains Isolated From Diseased Outbreak In Tilapia Farms In Thailand, Rungnapa Sakulworakan

Chulalongkorn University Theses and Dissertations (Chula ETD)

Aeromonas veronii outbreaks in tilapia farming caused relatively high mortality. Moreover, it was resistant to many kinds of antimicrobial used in Thailand aquaculture. According to no CLSI standard, the determination of antimicrobial efficacy has been limited phenotypically; the genomics study is required. This research aims to analyze the resistome of A. veronii isolated from diseased Tilapia in Chainat, Nong Khai and Uttaradit province, Thailand. Twelve isolates of A. veronii were identified base on gyrB sequencing then determined the MIC value to eight antimicrobials (AMP, AML, GEN, ENR, OXO, OXY, SXT, and FFC). According to MIC patterns, five representatives were performed …

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Chondroprotective Efficacy Of Undenatured Collagen Type Ii On Canine Osteoarthritis Secondary To Medial Patellar Luxation, Susolos Kunsuwanachai Jan 2019

Chondroprotective Efficacy Of Undenatured Collagen Type Ii On Canine Osteoarthritis Secondary To Medial Patellar Luxation, Susolos Kunsuwanachai

Chulalongkorn University Theses and Dissertations (Chula ETD)

Osteoarthritis (OA) is found secondary from medial patellar luxation (MPL) which is one of the most common diseases in small-breed dogs. Managements of the disease are surgical correction or a medical treatment. In the patients who are unable to do the surgical correction, non-steroidal anti-inflammatory drugs (NSAIDs) remains the drug of choice for OA therapy. Nowadays nutraceuticals have become more popular since there are no side effects once given for a long period of time. The purpose of this study was to evaluate the clinical chondroprotective effects of undenatured collagen type-II (UCII) on OA secondary to canine medial patellar luxation. …

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Comparison Of The Physical Capacity Using 6-Minute Walk Test And Questionnaire Before And After Resection Of Elongated Soft Palate By Bipolar Sealing Device In French Bulldogs, Tamolwan Anyamaneecharoen Jan 2019

Comparison Of The Physical Capacity Using 6-Minute Walk Test And Questionnaire Before And After Resection Of Elongated Soft Palate By Bipolar Sealing Device In French Bulldogs, Tamolwan Anyamaneecharoen

Chulalongkorn University Theses and Dissertations (Chula ETD)

Brachycephalic airway obstruction syndrome (BAOS) is an anatomical abnormality of upper airway commonly found in brachycephalic breeds leading to clinical signs and physical capacity impairment. The purposes of this study were to compare clinical signs and physical capacity in French bulldogs between before and after surgical correction using questionnaire and 6-minute walk test (6-MWT). Twenty-seven French bulldogs were enrolled in this study and divided into normal group (n=7) and BAOS group (n=20). History taking, clinical signs and questionnaire information were recorded and 6-MWT was performed in both groups. BAOS dogs had significantly higher severity of clinical signs from questionnaire with …

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Taxonomy Of Nocturnal Parasitic Wasps Family Braconidae (Hymenoptera: Ichneumonoidea) In Doi Phu Kha National Park, Thailand, Marisa Raweearamwong Jan 2019

Taxonomy Of Nocturnal Parasitic Wasps Family Braconidae (Hymenoptera: Ichneumonoidea) In Doi Phu Kha National Park, Thailand, Marisa Raweearamwong

Chulalongkorn University Theses and Dissertations (Chula ETD)

Parasitoid wasps of the family Braconidae are classified in the order Hymenoptera, same as bees, ants and other wasps. The Braconidae is one of the most species-rich families in the Insecta. Doi Phu Kha National Park (DPKNP) has highly diverse organisms, both flora and fauna reflecting the great varieties of habitat types, however, there is very little information on the taxonomy of Braconidae in this national park. Therefore, the aim of this research is to establish the taxonomy of nocturnal parasitic wasps in the family Braconidae within the DPKNP using light trapping technique. A total of 846 specimens, 177 morphospecies …

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Impacts And Adaptive Measures For Groundwater Use In The Mekong Delta. Case Study : Tra Vinh Province, Tuan Pham Van Jan 2019

Impacts And Adaptive Measures For Groundwater Use In The Mekong Delta. Case Study : Tra Vinh Province, Tuan Pham Van

Chulalongkorn University Theses and Dissertations (Chula ETD)

Because of the rapid growth of population and fast economic development in the Vietnamese Mekong Delta (VMD), the surface water resources are unable to meet these demands and groundwater is also over-abstracted. Groundwater depletion and saline water intrusion become the main problems that threaten drinking water supplies, farming systems, and livelihoods in the delta, especially coastal areas. It is necessary to provide a fully comprehensive picture of groundwater use (GWU) and its impact issues In Tra Vinh Province, a coastal province of VMD, dependency on GW increases from north to south which has a strong relation with availability of freshwater …

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การออกแบบกระบวนการดักจับคาร์บอนไดออกไซด์หลังการเผาไหม้ของโรงไฟฟ้าพลังงานความร้อนร่วมจากแก๊สธรรมชาติโดยใช้ K2co3/Γ-Al2o3, กนกพล โรจนกิจ Jan 2019

การออกแบบกระบวนการดักจับคาร์บอนไดออกไซด์หลังการเผาไหม้ของโรงไฟฟ้าพลังงานความร้อนร่วมจากแก๊สธรรมชาติโดยใช้ K2co3/Γ-Al2o3, กนกพล โรจนกิจ

Chulalongkorn University Theses and Dissertations (Chula ETD)

ปัจจุบันโลกเผชิญกับภาวะโลกร้อน ทำให้การดักจับคาร์บอนไดออกไซด์ก่อนที่แก๊สร้อนจะถูกปล่อยสู่ชั้นบรรยากาศเป็นสิ่งที่จำเป็น ในงานวิจัยที่ผ่านมาได้มีการศึกษากระบวนการดักจับคาร์บอนไดออกไซด์ด้วยตัวดูดซับของแข็งแทนที่กระบวนการดูดซึมด้วยสารละลายเอมีน และศึกษาความเป็นไปได้ทางพลังงาน ในขณะที่ความเป็นไปได้ทางเศรษฐศาสตร์ยังไม่เป็นที่สนใจ ในการวิจัยนี้จะทำการศึกษาความเป็นไปได้ทางพลังงานและเศรษฐศาสตร์ของแบบจำลองกระบวนการดักจับคาร์บอนไดออกไซด์หลังกระบวนการเผาไหม้ด้วยตัวดูดซับของแข็งที่ถูกจำลองด้วย Aspen Plus V.11.0 ที่ใช้ข้อมูลจากการทดลองของตัวดูดซับ K2CO3/ γ-Al2O3 ที่ปรับปรุงด้วยสารละลายเอมีน 3 ชนิด MEA, MDEA และ AMP จากการศึกษาพบว่าตัวดูดซับ K2CO3/γ-Al2O3 ที่ผ่านกระบวนการปรับปรุงสารละลายเอมีนมีความสามารถในการดูดซับสูงขึ้นกว่าเดิม โดยตัวดูดซับ K2CO3/γ-Al2O3 ที่ผ่านกระบวนการปรับปรุงด้วยสารละลายเอมีน ชนิด MDEA สามารถดักจับคาร์บอนไดออกไซด์มีปริมาณมากที่สุด โดยความสามารถในการดักจับคาร์บอนไดออกไซด์เพิ่มขึ้น ร้อยละ 28.81 จากนั้นนำข้อมูลจากการทดลองมาใช้ในแบบจำลองโรงไฟฟ้าที่มีระบบดักจับคาร์บอนไดออกไซด์ พบว่าแบบจำลองกระบวนการดักจับคาร์บอนไดออกไซด์ด้วยตัวดูดซับของแข็งสามารถดักจับคาร์บอนไดออกไซด์ร้อยละ 91.43 โดยมีประสิทธิภาพเอ็กเซอร์จีร้อยละ 29.24 และมีอัตราการคืนทุนที่ร้อยละ 6.55 ซึ่งดีกว่ากระบวนการดักจับคาร์บอนไดออกไซด์ด้วยสารละลายเอมีนชนิด MEA ที่มีประสิทธิภาพเอ็กเซอร์จีร้อยละ 28.27 และอัตราการคืนทุนที่ร้อยละ 3.98

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สหสัมพันธ์สำหรับทำนายความเร็วต่ำสุดในการเกิดฟลูอิไดเซชันของอนุภาคที่มีการกระจายขนาดต่างกัน, กฤติน ก่อเกิด Jan 2019

สหสัมพันธ์สำหรับทำนายความเร็วต่ำสุดในการเกิดฟลูอิไดเซชันของอนุภาคที่มีการกระจายขนาดต่างกัน, กฤติน ก่อเกิด

Chulalongkorn University Theses and Dissertations (Chula ETD)

การกระจายขนาดของอนุภาคเป็นตัวแปรสำคัญที่ส่งผลต่ออุทกพลศาสตร์ภายในเครื่องปฏิกรณ์ฟลูอิไดซ์เบด งานวิจัยนี้ ศึกษาผลของการกระจายขนาดของอนุภาค และ ผลของสภาวะดำเนินการ ที่มีต่อความเร็วต่ำสุดในการเกิดฟลูอิไดเซชัน โดยศึกษาทรายที่มีขนาดอนุภาคเฉลี่ยแตกต่างกัน 3 ขนาด รูปแบบการกระจายขนาดของอนุภาคแตกต่างกัน 5 รูปแบบ ปริมาณของอนุภาคของแข็งในช่วง 1 ถึง 3 กิโลกรัม และ อุณหภูมิของอนุภาคของแข็งในช่วง 30 ถึง 120 องศาเซลเซียส ผลที่ได้พบว่า ความเร็วต่ำสุดในการเกิดฟลูอิไดเซชันสำหรับอนุภาคของแข็งที่มีรูปแบบการกระจายขนาดกว้าง มีค่าต่ำกว่าความเร็วต่ำสุดในการเกิดฟลูอิไดเซชันสำหรับอนุภาคของแข็งที่มีรูปแบบการกระจายขนาดแคบ เนื่องจากการใส่อนุภาคขนาดเล็กลงไปในระบบมากขึ้นจะช่วยให้พฤติกรรมที่เกิดขึ้นภายในเครื่องปฏิกรณ์ฟลูอิไดซ์เบดดีขึ้น โดยค่าเบี่ยงเบนมาตรฐาน และค่าสัมประสิทธิ์ความเบ้ของรูปแบบการกระจายขนาดของอนุภาคส่งผลต่อความเร็วต่ำสุดในการเกิดฟลูอิไดเซชันเช่นกัน ความเร็วต่ำสุดในการเกิดฟลูอิไดเซชันมีค่าต่ำลงเมื่ออุณหภูมิของอนุภาคของแข็งสูงขึ้น ขณะที่ความเร็วต่ำสุดในการเกิดฟลูอิไดเซชันจะมีค่าสูงขึ้นเมื่อขนาดอนุภาคของแข็งเฉลี่ย และปริมาณอนุภาคของแข็งเริ่มต้นเพิ่มขึ้น นอกจากนี้ การสร้างสหสัมพันธ์โดยใช้การวิเคราะห์การถดถอยไม่เชิงเส้นแบบพหุโดยใช้ข้อมูลจากการทดลอง และการใช้โครงข่ายประสาทเทียม สามารถใช้ในการทำนายค่าความเร็วต่ำสุดในการเกิดฟลูอิไดเซชันได้ทั้งสองวิธี เนื่องจากให้ค่าความคลาดเคลื่อนสัมบูรณ์เฉลี่ยที่ใกล้เคียงกัน

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ผลของชาร์จากชีวมวลต่อการผลิตน้ำมันดิบชีวภาพโดยไฮโดรเทอร์มัลลิควิแฟกชัน, กัปตัน สมบูรณชนะชัย Jan 2019

ผลของชาร์จากชีวมวลต่อการผลิตน้ำมันดิบชีวภาพโดยไฮโดรเทอร์มัลลิควิแฟกชัน, กัปตัน สมบูรณชนะชัย

Chulalongkorn University Theses and Dissertations (Chula ETD)

การใช้พลังงานเชื้อเพลิงฟอสซิลทำให้เกิดมลภาวะต่อสิ่งแวดล้อม เนื่องจากเกิดการปลดปล่อยคาร์บอนไดออกไซด์จำนวนมาก พลังงานจากชีวมวลเป็นแหล่งพลังงานหมุนเวียนที่จะช่วยลดปัญหาข้างต้นกระบวนการไฮโดรเทอร์มัลลิควิแฟกชันเป็นกระบวนการแปลงสภาพชีวมวลเป็นเชื้อเพลิงเหลวที่น่าสนใจ กระบวนการนี้ให้ร้อยละผลได้น้ำมันดิบชีวภาพที่สูงกว่ากระบวนการไพโรไลซิส การใช้ตัวเร่งปฏิกิริยาร่วมในกระบวนการไฮโดรเทอร์มัลลิควิแฟกชันสามารถปรับปรุงคุณภาพน้ำมันดิบชีวภาพและผลได้ของน้ำมันดิบชีวภาพได้ ดังนั้นในงานวิจัยนี้จึงสนใจศึกษาการนำชาร์จากชีวมวลมาใช้เป็นตัวเร่งปฏิกิริยา การทดลองดำเนินการในเครื่องปฏิกรณ์ความดันสูงแบบกะที่อุณหภูมิ 300-350 องศาเซลเซียส ที่ความดันเริ่มต้น 2 เมกะพาสคัล โดยใช้เวลาในการทำปฏิกิริยา 60 นาที จากผลทดลองพบว่าเมื่อใช้ชาร์ชานอ้อย และ ถ่านกัมมันต์ ให้ร้อยละผลได้น้ำมันดิบชีวภาพเพิ่มขึ้น เนื่องจากชาร์ชานอ้อย และ ถ่านกัมมันต์ มีผลในการเร่งปฏิกิริยาการแตกตัวของชีวมวล และจากผลของอุณหภูมิในการทำปฏิกิริยาที่อุณหภูมิ 300 และ 350 องศาเซลเซียส พบว่าเมื่ออุณหภูมิสูงขึ้นผลได้น้ำมันดิบชีวภาพจะลดลงและผลิตภัณฑ์ที่เป็นแก๊สเพิ่มขึ้น จากการวิเคราะห์องค์ประกอบทางเคมีของน้ำมันดิบชีวภาพด้วยเทคนิค GC / MS พบว่าองค์ประกอบของคีโตนเพิ่มขึ้น ในขณะที่สารประกอบไฮโดรคาร์บอนลดลง แสดงให้เห็นว่า ชาร์ช่วยส่งเสริมปฏิกิริยาการสลายตัวของสารประกอบไฮโดรคาร์บอน นอกจากนี้ยังมีการศึกษาผลของการเติมโพแทสเซียมบนชาร์ชานอ้อย ชาร์กะลามะพร้าว และ ถ่านกัมมันต์ พบว่าโพแทสเซียมบนชาร์ทุกชนิดส่งผลให้ร้อยละผลได้น้ำมันดิบชีวภาพเพิ่มสูงขึ้น

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