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Factors Relating To Methamphetamine Relapse Risk Among Clients In The Substance Rehabilitation Center Of National Narcotics Boards In West Java, Indonesia, Gian Nurmaindah Hendianti
Factors Relating To Methamphetamine Relapse Risk Among Clients In The Substance Rehabilitation Center Of National Narcotics Boards In West Java, Indonesia, Gian Nurmaindah Hendianti
Chulalongkorn University Theses and Dissertations (Chula ETD)
The purposes of this descriptive correlational research were to describe methamphetamine relapse risk and examine the relationship between self-efficacy, outcome expectancy, motivation, coping, emotional state, craving, social support, and methamphetamine relapse risk among methamphetamine users. The purposive sample of 165 who met the inclusion criteria were recruited from clients admitted to a primary phase treatment in the Substance Rehabilitation Center of National Narcotics Board in West Java, Indonesia. The research instruments were: 1) the demographic characteristic questionnaire, 2) Drug Taking Confidence Questionnaire, 3) Stimulant Effect Expectancy Questionnaire, 4) Stage of Change Readiness and Treatment Eagerness Scale version 8.0 for Drug, …
A Development Of Thai Moral Integrity Scale For Professional Nurses, Jinda Nunthawong
A Development Of Thai Moral Integrity Scale For Professional Nurses, Jinda Nunthawong
Chulalongkorn University Theses and Dissertations (Chula ETD)
The purpose of this study was to develop the Thai Moral Integrity Scale (TMIS), and to test its psychometric properties. The construct definition and content domains of the TMIS were developed through the intensive literature reviews and test the content validity by experts. This used to guide the conceptual framework in this instrument. The content validity was examined using the panel of five experts. The content validity index (S-CVI) was 1.00. The Moral Integrity Scale was consists 27 items with five Likert scale. The result of psychometric properties from 502 professional nurses by using exploratory factor analysis indicated that there …
Predicting Factors Of Recovery Among Persons With Major Depressive Disorder, Nusra Vorapatratorn
Predicting Factors Of Recovery Among Persons With Major Depressive Disorder, Nusra Vorapatratorn
Chulalongkorn University Theses and Dissertations (Chula ETD)
The purposes of this descriptive research was to examine the causal relationship between strength self-efficacy, resourcefulness, purpose in life, social support, alcohol abuse, and recovery among persons with major depressive disorder (MDD). The conceptual framework was guided by Schlotfeldt's Health Seeking Model. 444 participants with MDD. who attended outpatient department, mental health and psychiatric clinics, and mental health and psychiatric division in eight hospitals from all part of Thailand participated in this study. The participants were obtained by simple random sampling. The research instruments included a personal data sheet, the Strength Self-Efficacy Scale, the Resourcefulness Scale, the Purpose in Life …
Self-Care Of Older Persons Living With Diabetes In Vietnam: A Qualitative Study, Quyen Truong Thi Mai
Self-Care Of Older Persons Living With Diabetes In Vietnam: A Qualitative Study, Quyen Truong Thi Mai
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study aimed to describe the meaning of "self-care" from the perspectives of older persons living with diabetes and explored the self-care behaviors of older persons living with diabetes. The qualitative method was applied in this study. Data were collected by in-depth interview of 16 older persons with Type 2 diabetes in Vietnam. In addition, field note and observation note were written on the reflections, ideas, and meaning of self-care and self-care practices during the data collection process. All data were analyzed by using content analysis method. The results of the study were reflected the self-care from the perspective of …
Prevalence Of Chronic Temporomandibular Disorder Pain And Comorbidities In A Group Of Thai Patient: A Cross Sectional Study, Tra Thu Nguyen
Prevalence Of Chronic Temporomandibular Disorder Pain And Comorbidities In A Group Of Thai Patient: A Cross Sectional Study, Tra Thu Nguyen
Chulalongkorn University Theses and Dissertations (Chula ETD)
Objectives: 1. to investigate the prevalence of chronic temporomandibular disorder (TMD) and its comorbidities in a group of Thai patients; 2. to evaluate the relationship between pain parameters (pain duration, pain intensity, and pain frequency) with the number of comorbidities and widespread pain index (WPI); 3. to assess the relationship between the presence of chronic pain with familial history in TMD pain patients. Methods: A cross-sectional study was undertaken of 351 outpatients. Patients were given an interviewer-administered questionnaire which contained four parts (demographic data, pain parameters, WPI and comorbidities diagnosis). Diagnosis was made in accordance with Diagnostic Criteria for Temporomandibular …
The Effect Of Uncertainty Management Program On Quality Of Life Among Vietnamese Women With Post Mastectomy, Xuan Ha Thi Nhu
The Effect Of Uncertainty Management Program On Quality Of Life Among Vietnamese Women With Post Mastectomy, Xuan Ha Thi Nhu
Chulalongkorn University Theses and Dissertations (Chula ETD)
The aim of this study was to test the effect of the Uncertainty Management Program (UMP) on quality of life among Vietnamese women at 3-weeks post mastectomy. The quasi-experimental design with posttest only was conducted in 115 women with post mastectomy who were assigned in experimental group (n=57) and control group (n=58). The experimental group received the UMP and routine care while the control group received only routine care. Participants were assessed at 3-weeks post mastectomy using the modified Quality of Life Index Scale Vietnamese version with Cronbach's alpha coefficient of .81. It was found that at 3-weeks post-mastectomy, the …
Patient's Perception And Satisfaction On Dental Implant Therapy By Postgraduate Dental Students And Experienced Dentists, Pat Vipattanaporn
Patient's Perception And Satisfaction On Dental Implant Therapy By Postgraduate Dental Students And Experienced Dentists, Pat Vipattanaporn
Chulalongkorn University Theses and Dissertations (Chula ETD)
Objective: To evaluate and compare patient's perception and satisfaction between patients who received dental treatment from postgraduate dental students and experienced dentists. Material and methods: This descriptive cross-sectional study was performed in patients who received the dental implant from Faculty of dentistry Chulalongkorn University. A data collection of patient's perception and satisfaction was done by questionnaire which was sent by mail. The questionnaire contained 23 statements including 7 statements of demographic data, 7 statements of perception, and 9 statements of satisfaction. The patient had to answer through the one-best-answer multiple choices and visual analog scale (VAS). Results: The 382 participants …
Comparison Of The Accuracy Of Surgical Guided Template Produced From Intraoral Scan Technique And Model Scan Technique For Implantation Using Computer Assisted Implant Surgery, Prudsaporn Kiatkroekkrai
Comparison Of The Accuracy Of Surgical Guided Template Produced From Intraoral Scan Technique And Model Scan Technique For Implantation Using Computer Assisted Implant Surgery, Prudsaporn Kiatkroekkrai
Chulalongkorn University Theses and Dissertations (Chula ETD)
Objectives: To compare the accuracy of implant position placed by CAIS technique using surgical guided template produced by intraoral scan and model scan. Materials and methods: Patients who needed single tooth implant restoration were enrolled in this study and devided into two groups randomly according to the surface scan technique (n=30 each group). Intraoral scans were done using the Trios Scanner (3shape). While, diagnostic casts were scanned by D900L lab scanner (3shape). The templates were design by the clinician using coDiagnostiX software (Dental Wings Inc.). Implant surgery were performed according to fully CAIS protocol. CoDiagnostiX software was used to compare …
In Vitro Effect Of L-Ascorbic Acid On Gingival Fibroblast To Regulate Wound Healing., Tatcha Chaitrakoonthong
In Vitro Effect Of L-Ascorbic Acid On Gingival Fibroblast To Regulate Wound Healing., Tatcha Chaitrakoonthong
Chulalongkorn University Theses and Dissertations (Chula ETD)
Background and Objective: Besides closing the wound by intrinsic properties like migration and proliferation, gingival fibroblasts produce a major source of extracellular matrix especially collagen and play a major role in oral wound healing. Vitamin C or L-ascorbic acid has diverse functions in the body, including an essential role in hydroxylation reactions which is necessary for collagen formation. Whether L-ascorbic acid can promote gingival wound healing through inducing proliferation of fibroblasts is of our interest. The aim of this study is to evaluate the effect of L-ascorbic acid on gingival fibroblasts behaviors to promote wound healing in vitro. Materials and …
Comparative Study Of In Vivo Bone Regeneration Using Chitosan/Dicarboxylic Acid Scaffold Implanted With Human Periodontal Ligament Cells, Teerawat Sukpaita
Comparative Study Of In Vivo Bone Regeneration Using Chitosan/Dicarboxylic Acid Scaffold Implanted With Human Periodontal Ligament Cells, Teerawat Sukpaita
Chulalongkorn University Theses and Dissertations (Chula ETD)
After tooth loss, a consequent atrophy of the alveolar process always takes place and adversely affect the reconstruction process especially by dental implant. A novel chitosan/dicarboxylic acid scaffold (CS/DA scaffold) has been developed and proven to be an excellent candidate material in bone tissue engineering. This study aimed to evaluate the effects of a CS/DA scaffold with and without seeded primary human periodontal ligament cells (hPDLCs) in mouse calvarial defect model. Eighteen mice were divided into 3 groups of 6 each. Four-millimeter calvarial defects were created on both side of parietal bone and implanted with either CS/DA scaffold or CS/DA …
Induction Of S100a7 Expression From Mechanical Stress-Induced Human Dental Pulp Cells And Its Effect On Osteoclastogenesis, Hataichanok Charoenpong
Induction Of S100a7 Expression From Mechanical Stress-Induced Human Dental Pulp Cells And Its Effect On Osteoclastogenesis, Hataichanok Charoenpong
Chulalongkorn University Theses and Dissertations (Chula ETD)
Mechanical injuries of dental pulp tissues could lead to root resorption by osteoclast/odontoclast. S100A7 has been demonstrated to involve in inflammatory processes and potentially involved in bone destruction. However, the roles of S100A7 in dental pulp have not been reported. Therefore, this this study aimed to investigate the effect of mechanical stress on S100A7 expression in human dental pulp cells (hDPCs) and to investigate the effect of S100A7 protein on osteoclast differentiation. HDPCs were stimulated with in vitro compressive loading. Cell viability was determined using MTT assay. Real-time PCR (qPCR) and ELISA were utilized to determine the mRNA and protein …
The Application Of Prostacyclin In Promoting Angiogenesis Of Dental Pulp Tissue In A Three Dimensional Organ Culture System, Sonntana Seang
The Application Of Prostacyclin In Promoting Angiogenesis Of Dental Pulp Tissue In A Three Dimensional Organ Culture System, Sonntana Seang
Chulalongkorn University Theses and Dissertations (Chula ETD)
Background: Dental pulp vitality can be threatened by carious or iatrogenic exposure that can lead to pulp tissue loss. The formation of a vascular network is crucial to provide a suitable environment for tissue regeneration. Thus, promoting angiogenesis is essential for successful pulpal repair in regenerative endodontics therapy. Iloprost, a prostacyclin analog, promotes vascularization in several organs such as, heart, lung, and corneal. Previously, it has been demonstrated that, iloprost induced pulpal blood flow and enhanced dentin formation in a rat mechanical pulp exposure model. However, the angiogenic effect of iloprost on the human dental pulp vasculature remains unknown. Objective: …
Differential Dendritic Cell Responses To Candida Species, Thu Nguyen Ngoc
Differential Dendritic Cell Responses To Candida Species, Thu Nguyen Ngoc
Chulalongkorn University Theses and Dissertations (Chula ETD)
Mannan in the outermost layer of Candida cell wall may be the first molecules that interact with host dendritic cells (DCs) and activate immune responses that determine disease outcomes. However, little is known how different mannan structures of common Candida species affect DC activation and T cell responses. Thus, this work compared the effects of mannans of Candida albicans, Candida tropicalis, Candida glabrata, Candida krusei, Candida parapsilosis and Candida dubliniensis on bone marrow-derived DC (BMDC) responses in mice. C. albicans and C. tropicalis mannan could not activate DC maturation, however, they induced IFN-gamma production which consequently provoked Th1 responses. C. …
Cd103+ Tissue Resident Memory T Cells In Oral Lichen Planus, Phisut Amnuaiphanit
Cd103+ Tissue Resident Memory T Cells In Oral Lichen Planus, Phisut Amnuaiphanit
Chulalongkorn University Theses and Dissertations (Chula ETD)
Oral lichen planus (OLP) is a chronic inflammatory disease that results from a disorder of infiltrating T cells. Tissue resident memory T cells (TRM cells) are CD103-expressing T cells that persist within previously inflamed oral mucosa in the long term to provide locally rapid defensive responses against encountered pathogens. They are also speculated to be associated with some diseases including OLP. This study aimed to determine the number and the proportion of CD103+ TRM cells in the OLP lesions as compared to the normal mucosa. Immunohistochemical study of CD3+, CD4+, CD8+ and CD103+ cells in 15 OLP tissues and 15 …
Expression Of Inflammatory Mediators In Cd103+ And Cd103- T Cells Isolated From Periodontitis Tissue, Benjarat Isaraphithakkul
Expression Of Inflammatory Mediators In Cd103+ And Cd103- T Cells Isolated From Periodontitis Tissue, Benjarat Isaraphithakkul
Chulalongkorn University Theses and Dissertations (Chula ETD)
Despite the important role of tissue - resident memory T (TRM) cells in immunity and pathology of mucosal tissues, the study of tissue-resident memory T cells in periodontitis tissues is limited. Previous investigation in our laboratory identified the localization of TRM (CD103+ T cells) in periodontitis tissue. However, their function is not known. The aim of this study is to investigate the production of inflammatory mediators by CD103+ and CD103- T cells in periodontitis tissue. Human periodontal tissues were obtained from patients with severe chronic periodontitis. Intracellular cytokine staining was performed and expression of CD103, interferon gamma (IFN-γ), interleukin-17 (IL-17) …
Assisted Methane Hydrate Formation With The Addition Of Promoters, Chutikan Jaikwang
Assisted Methane Hydrate Formation With The Addition Of Promoters, Chutikan Jaikwang
Chulalongkorn University Theses and Dissertations (Chula ETD)
Natural gas hydrates play an important role in the largest reservoir of hydrocarbons on earth. The gas hydrates have received increasing attention in an excellent way of new technology for gas in large quantity storage and transportation. However, the main challenge to use methane hy¬drates has faced many challenges such as the slow formation rate, low growth rate during hydrate formation, and low conversion ratio of gas to solid hydrates leading to poor storage capacity. In this work, methane hydrate formation and dissociation in the presence of different Cyclopentane (CP), Tetra-n-butyl phosphonium bromide (TBPB) and Tetra-n-butyl ammonium bromide (TBAB) concentrations …
Microbial Conversion Of Cellulose To Sugars By Bacterial Enzyme, Kessara Seneesrisakul
Microbial Conversion Of Cellulose To Sugars By Bacterial Enzyme, Kessara Seneesrisakul
Chulalongkorn University Theses and Dissertations (Chula ETD)
This work studied the conversion of lignocellulosic materials to sugars, the intermediates for bioethanol production, by a bacterial enzyme. Due to the complex structure of lignocellulose, a cellulase enzyme cannot effectively access and hydrolyse cellulose fibers. Various pretreatment processes of lignocellulose have been studied to enhance enzymatic hydrolysis to date. In this work, corncob was firstly studied for microbial pretreatment using three microorganisms including two bacterial strains of Bacillus subtilis A 002 and Cellulomonas sp. TISTR 784 and a fungal strain of Phanerochaete sordida SK7. The results showed that the microbial pretreatment with P. sordida SK7 was the most effective …
Effects Of Bead Size And Concentration Of Unstable Asphaltenes Obtained From Different Centrifugation Techniques On Asphaltene Deposition In Packed Bed Apparatus, Kimchhay Lao
Chulalongkorn University Theses and Dissertations (Chula ETD)
Asphaltenes are the heaviest and most polar fraction of petroleum crude oil. They are the collection of components that can be soluble in aromatics solvents such as benzene or toluene, but insoluble in normal alkanes, n-pentane, n-hexane, or n- heptane. Asphaltenes are a class of molecules consisted of grouped aromatic rings with alkane chains. Changing pressure, temperature, composition, and shear rate during transportation can cause precipitation and deposition, resulting in reduced reservoir productivity due to restricted flow lines, fouling and blockages in the pore spaces of the reservoir. The goal of this investigation is to assess validity of two aspects …
Adsorptive Bubble Separation For Oil Removal, Paweena Kanokkarn
Adsorptive Bubble Separation For Oil Removal, Paweena Kanokkarn
Chulalongkorn University Theses and Dissertations (Chula ETD)
This present work emphasized on the current knowledge regarding (i) feasibility of multi-stage forth flotation operation for oil removal, and (ii) comprehension of dynamic surface tensions of surfactant solutions in relation to foam characteristics. A multi-stage forth flotation efficiency depends on the enhancement of interfacial adsorption and the number of bubble caps and tray. The operational parameters including foam height, air flow rate and feed flow rate were controlled to obtain the optimum process performance. Under the optimum conditions—a number of trays of 4, a foam height of 60 cm, an air flow rate of 40 L/min, a feed flow …
Investigation Of Asphaltene Aggregation Kinetics In The Presence Of Water-In-Oil Emulsion, Penpitcha Roengsamut
Investigation Of Asphaltene Aggregation Kinetics In The Presence Of Water-In-Oil Emulsion, Penpitcha Roengsamut
Chulalongkorn University Theses and Dissertations (Chula ETD)
Asphaltene is a component of the petroleum liquid defined operationally. It represents the most refractory (or the heaviest fraction). It is well-known that changes in temperature, pressure, or composition can destabilize asphaltenes and cause aggregation and deposition in porous formations, production lines, and processing facilities (Sheu and Mullins 1995). This leads to the study of the behavior of asphaltene aggregation and parameters that could affect the rate of aggregation which, in this case, is water-in-oil emulsion. In addition, the asphaltene aggregation model derived by Haji-Akbari (2013) is applied as a framework in this study which explains the correlation between the …
Study On Energy Storage Ability Of Zno/Tio2 For Photocatalytic Degradation Of Isopropanol, Ratchawan Jarumanee
Study On Energy Storage Ability Of Zno/Tio2 For Photocatalytic Degradation Of Isopropanol, Ratchawan Jarumanee
Chulalongkorn University Theses and Dissertations (Chula ETD)
The photocatalytic degradation of isopropanol under UV irradiation was studied by using p-n junction of ZnO/TiO2 photocatalysts prepared by sol-gel technique. Their energy storage ability was tested with their photocatalytic activity where there was no UV illumination. That was investigated by illumination the system with UV light for 2 h and off for 2 h until 8 h. The composition and surface structure of the catalyst were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), surface area analysis, and particle size analysis. The change in the isopropanol concentration was observed by using gas chromatography. The result showed that the …
Vegetable Oil Based Microemulsion Biofuels, U-Larak Peson
Vegetable Oil Based Microemulsion Biofuels, U-Larak Peson
Chulalongkorn University Theses and Dissertations (Chula ETD)
The growth of energy demand increases dramatically which has resulted in an increase of exhaust emissions to air quality deterioration. Therefore, there are driving forces in the development of renewable energy production technologies. Vegetable oils based reverse micelle microemulsions have been increased in attention for biofuel production. This work aims to formulate microemulsion biofuel containing palm oil/diesel blend as nonpolar phase, and ethanol/butanol, as a polar phase. The nonionic alcohol ethoxylate surfactant with the different numbers of EO groups, EOn (n=1, 3, 5, and 9) were selected as a stabilizing agent. A pseudo-ternary phase diagram was conducted to determine an …
Improvement Of Life Cycle Assessment Software And Its Applications, Yodsathorn Chavewanmas
Improvement Of Life Cycle Assessment Software And Its Applications, Yodsathorn Chavewanmas
Chulalongkorn University Theses and Dissertations (Chula ETD)
LCSoft is Life Cycle Assessment (LCA) software which developed for perform LCA together with process design. It is a stand-alone tool with ability to be integrated with other process design tools such as process simulation software (PROII/ASPEN), economic analysis tool (ECON), and sustainable process design tool (SustainPro). In addition, several optional interpretation features are available such as, sensitivity analysis, alternative comparison, and eco-efficiency evaluation. In this research, LCSoft had been improved in performance and application range. The development framework consisted of four tasks. The first task deals with improvement of LCI and LCIA calculation which new pathway for calculation and …
Metal-Salen Derivatives For Electro-Reduction Of Carbon Dioxide, Kantima Chitchak
Metal-Salen Derivatives For Electro-Reduction Of Carbon Dioxide, Kantima Chitchak
Chulalongkorn University Theses and Dissertations (Chula ETD)
Copper(II) salen, salophen-based ligands, and their corresponding copper complexes were prepared and utilized for the electrocatalytic reduction of carbon dioxide. Controlled-potential electrolysis of copper(II) salen electrocatalyst with carbon dioxide in non-aqueous solution was investigated to obtain the optimized electrolysis condition including the applied potential and proton donor quantity. With the applied potential of –2.10 V, carbon monoxide (3.50-16.30%) was obtained as the only product in gas phase. Methane was additionally found with the addition of proton donor and its maximum percentage (0.39 ± 0.00%) were obtained from the electrolysis with 25.00 mM proton donor and 2.00 mM copper(II) salen. Moreover, …
Synthesis Of Ni-Tin Incorporated Porous Silica Catalysts For Dry Reforming Of Methane, Maslin Chotirach
Synthesis Of Ni-Tin Incorporated Porous Silica Catalysts For Dry Reforming Of Methane, Maslin Chotirach
Chulalongkorn University Theses and Dissertations (Chula ETD)
A new titanium nitride (TiN) promoted nickel catalyst was synthesized and tested as an alternative catalyst in the dry reforming of methane (DRM). The series of this catalyst with various Ni and TiN contents was prepared in two steps, direct synthesis of SBA-15 in the presence of TiN, followed by the impregnation of Ni. The influence of TiN promoted Ni-based catalyst on dry reforming reaction was investigated at the temperature of 700ºC and atmospheric pressure for a duration of 4 h, using feed ratio of CH4/CO2 = 1. The promising catalysts, that gave highest CO2 and CH4 conversions as well …
Electrochemical Properties Of Lnsr3-Xcaxfe3-Ybyo10 (Ln = La, Pr And Sm; X = 0-1.0; B = Co, Ni And Cu; Y = 0-1.5) For Intermediate Temperature Solid Oxide Fuel Cells, Nicharee Wongsawatgul
Electrochemical Properties Of Lnsr3-Xcaxfe3-Ybyo10 (Ln = La, Pr And Sm; X = 0-1.0; B = Co, Ni And Cu; Y = 0-1.5) For Intermediate Temperature Solid Oxide Fuel Cells, Nicharee Wongsawatgul
Chulalongkorn University Theses and Dissertations (Chula ETD)
To enhance the electrochemical performance of cathode material for intermediate temperature solid oxide fuel cell (IT-SOFC) the Ruddlesden-Popper (RP) phases of LnSr3-xCaxFe3-yByO10 (Ln = La, Pr and Sm; x = 0-1.0; B = Ni, Co, and Cu; y = 0-1.5) was investigated and prepared by citric nitrate combustion method. Firstly, various Ca concentrations were added to the LaSr3-xCaxFe3O10-δ structure and it was found that the materials contained low Ca concentration provided the lower area specific resistance (ASR) and better electrochemical cell performance due to the enhance in conductivity and reduction of TEC. Secondly, the effect of Pr and Sm replacement …
Electrochemical Sensors For Human Papillomavirus Dna, C-Reactive Protein And Food Colorants Detections, Sakda Jampasa
Electrochemical Sensors For Human Papillomavirus Dna, C-Reactive Protein And Food Colorants Detections, Sakda Jampasa
Chulalongkorn University Theses and Dissertations (Chula ETD)
In this dissertation, electrochemical sensors for determination of medical biomolecular markers and food colorants were developed. The research can be divided into two parts. In the first part, electrochemical sensors for determination of clinically important biomarkers were studied. There was two subprojects based on the target markers. The first subproject was the development of electrochemical sensor for the simultaneous detection of high-risk human papillomaviruses (HPV) DNA type 16 and 18 as biomarkers for cervical cancer. In this work, a highly specific pyrrolidinyl peptide nucleic acid was employed as DNA capture probe for both target DNAs. A second PNA probe labeled …
Fecu/Sio2 Catalysts Prepared By Autocombustion Method For Fischer-Tropsch Synthesis, Suthasinee Pengnarapat
Fecu/Sio2 Catalysts Prepared By Autocombustion Method For Fischer-Tropsch Synthesis, Suthasinee Pengnarapat
Chulalongkorn University Theses and Dissertations (Chula ETD)
The purpose of this study was to prepare iron-based catalysts supported on silica by autocombustion method for directly using for Fischer-Tropsch synthesis (FTS) without a reduction step. The effect of different citric acid (CA):iron nitrate (N) molar ratios (CA:N), acid types and SiO2 supports on the FTS performance of catalysts were investigated. The CA:N had an important influence on the formation of iron active phases (FexC) and FTS activity. Increasing the CA:N molar ratios up to 0.1 increased CO conversion of catalyst to 86.5%, which was then decreased markedly at higher CA:N molar ratios. An excess of CA resulted in …
Microencapsulation Of Eugenol In Polyelectrolyte Complexes Of Chitosan And Alginate, Chamaiporn Supachettapun
Microencapsulation Of Eugenol In Polyelectrolyte Complexes Of Chitosan And Alginate, Chamaiporn Supachettapun
Chulalongkorn University Theses and Dissertations (Chula ETD)
Eugenol is widely used in several applications such as food activity packaging to prolong shelf life of fruits and vegetables because of its antimicrobial activity. However, eugenol is easy to decompose, leading to reduce its activity. In this work, we prepared eugenol loaded alginate-chitosan microparticles in order to solve this problem and controlled release essential oil using ionic gelation technique. The effect of concentration of eugenol (0.1-0.5 g), calcium chloride (0.5 – 8 %W/V) and surfactant (2-10% W/V) was investigated. The results showed that the optimum condition was eugenol 0.1 g, calcium chloride 2% W/V and surfactant 4% W/V. The …
Functional Surfactants In Lubricant For Microelectronic Industry, Chuenkamol Khongphow
Functional Surfactants In Lubricant For Microelectronic Industry, Chuenkamol Khongphow
Chulalongkorn University Theses and Dissertations (Chula ETD)
The functional surfactants, as the additional additives in the standard glycol-based lubricant were studied and optimized to reduce and protect the surface of the magnetic read/write head from deposited contaminants during the lapping processes. The scanning electron microscopy (SEM) and energy-dispersive x-ray spectroscopy (EDS) results identified that the black contamination was bismuth (Bi) particles, came out from lapping plate during the lapping process due to wear. Selected surfactants exhibited the results in reduce and prevent the deposition of contaminants by forming the micelle beyond their critical micelle concentration (CMC) values. We found that both polyethoxylate alcohol (PEAL) and quaternary amines …