Thin-layer Drying Kinetics of Robusta Coffee

Wanich Nilnont,Sutida Phitakwinai,Kosart Thawichsri 국제문화기술진흥원 2015 International Journal of Advanced Culture Technolo Vol.3 No.2

This paper was aimed to study the drying kinetics of coffee and to investigate the thin-layer drying kinetics of coffee by using a convective air dryer. The coffee was dried for the temperatures of 40, 50 and 60 ℃ with relative humidity in the range of 14-25% the airflow rate fixed at 1 m/s. According to the experiment result, the drying rate curve showed that drying process took place only in the falling rate period. Seven thin layer drying models (Newton, Page, Henderson and Pabis, Logarithmic, Wang and Singh, Two terms, Modified Henderson and Pabis) were fitted to the experimental moisture content data. The Two-trem model was found to be a better model for describing the characteristics of coffee for the temperatures of 40, 50 and 60 ℃. The effective moisture diffusivity of coffee increased when the drying temperature increased. The value was in the range of 4.5028 x 10-11 to 6.4803 x 10-11 m2/s.

High Prevalence of Hepatocellular Carcinoma in Patients with Chronic Hepatitis B Infection in Thailand

Wanich, Nattawat,Vilaichone, Ratha-Korn,Chotivitayatarakorn, Peranart,Siramolpiwat, Sith Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.6

Background: Chronic hepatitis B (CHB) infection is one of the important causes of hepatocellular carcinoma (HCC) in Thailand, involved in the pathogenesis and leading to a development of HCC with or without cirrhotic changes of the liver. This study was aimed to investigate the predictive factors for HCC among CHB patients in a tertiary care center in Thailand. Materials and Methods: We conducted a retrospective study of CHB patients with or without HCC during the period of January 2009 and December 2014 at Thammasat University Hospital, Pathumthani, Thailand. Data on clinical characteristics, biochemical tests and radiologic findings were collected from review of medical records. Results: A total of 266 patients were diagnosed with CHB in Thammasat university hospital during the study period. However, clinical information of only 164/266 CHB patients (98 males, 66 females with mean age of 49.4 years) could be completely retrieved in this study. The prevalence of HCC in CHB infection in this study was 38/164 (23.2%). CHB patients with HCC had a mean age older than those without HCC (59.5 vs 47 years, P-value = 0.01). Furthermore, history of upper GI bleeding, tattooing, blood transfusion, and chronic alcoholism were significantly more common in CHB patients with HCC than patients without HCC (13.2% vs 3.2% P-value 0.03, OR = 4.6, 95%CI = 1.2-18.1, 20% vs 3.9%, P-value = 0.01, OR= 6.1, 95% CI= 1.6-23.6, 20% vs 6.3%, P-value = 0.03, OR = 3.8, 95%CI =1.1-12.7, 62.2% vs 30.3%, P-value <0.0001, OR = 3.7, 95%CI= 1.7-8.1 respectively). Interestingly, more CHB patients with HCC had evidence of cirrhosis than those without HCC (78.9% vs 20.4%, P-value <0.0001, OR = 14.6, 95%CI = 5.8-36.7). In CHB patients with HCC, surgical therapy provided longer survival than radiofrequency ablation (RFA) (72 vs 46.5 months, P-value= 0.04). The mean survival time after HCC diagnosis was 17.2 months. Conclusions: HCC remains a major problem among patients with CHB infection in Thailand. Possible risk factors are male gender, history of upper GI bleeding, chronic alcoholism, tattooing, blood transfusion and evidence of cirrhosis. For early stage HCC patients, surgical treatment provided longer survival time than RFA. Most HCC patients presented with advanced disease and had a grave prognosis. Appropriate screening of CHB patients at risk for HCC might be an appropriate approach for early detection and improvement of long-term outcomes.

Association between Health Literacy, Self-care Behavior, and Blood Sugar Level among Older Patients with Type 2 Diabetes in Rural Thai Communities

Wanich Suksatan,Kantapong Prabsangob,Bovornpot Choompunuch 대한노인병학회 2021 Annals of geriatric medicine and research Vol.25 No.4

Background: Diabetes mellitus is a major problem worldwide. Moreover, older patients with significantly limited health literacy (HL) tend to have worse self-care behaviors and health outcomes. This study aimed to describe the associations of HL, self-care behavior, and blood sugar levels among older patients with type 2 diabetes in rural Thai communities. Methods: This cross-sectional study included 415 patients with diabetes who were purposively selected from rural Thai communities. Data were collected using questionnaires and analyzed using descriptive statistics, Pearson correlation, Spearman rho, and stepwise multiple linear regression. Results: The results revealed that most participants were women (66.50%). The respondents had moderate overall HL (2.68±0.64). On average, the respondents had fair overall self-care behavior (4.0±0.33). We discovered that HL was significantly positively correlated with self-care behavior (r=0.90) but not with blood sugar level. In addition, self-care behavior was significantly negatively correlated with blood sugar level (r=-0.50). Self-care behaviors and blood sugar levels were significant predictors of HL in patients with type 2 diabetes (total variance, 28.4%). Conclusion: The results suggested increased HL in patients with diabetes would improve self-care behavior and, consequently, decrease their blood sugar level. Our findings indicate the need to involve nurses and multidisciplinary healthcare teams when developing health promotion programs to encourage blood sugar control.

Thin-layer Drying Kinetics of Robusta Coffee

Nilnont, Wanich,Phitakwinai, Sutida,Thawichsri, Kosart The International Promotion Agency of Culture Tech 2015 International Journal of Advanced Culture Technolo Vol.3 No.2

This paper was aimed to study the drying kinetics of coffee and to investigate the thin-layer drying kinetics of coffee by using a convective air dryer. The coffee was dried for the temperatures of 40, 50 and $60^{\circ}C$ with relative humidity in the range of 14-25% the airflow rate fixed at 1 m/s. According to the experiment result, the drying rate curve showed that drying process took place only in the falling rate period. Seven thin layer drying models (Newton, Page, Henderson and Pabis, Logarithmic, Wang and Singh, Two terms, Modified Henderson and Pabis) were fitted to the experimental moisture content data. The Two-trem model was found to be a better model for describing the characteristics of coffee for the temperatures of 40, 50 and $60^{\circ}C$. The effective moisture diffusivity of coffee increased when the drying temperature increased. The value was in the range of $4.5028{\times}10^{-11}$ to $6.4803{\times}10^{-11}m^2/s$.

Amino and Nitro Derivatives of 5,7-Dimethoxyflavone from Kaempferia parviflora and Cytotoxicity against KB Cell Line

Suchana Wanich,Chavi Yenjai 대한약학회 2009 Archives of Pharmacal Research Vol.32 No.9

Structural modification of 5,7-dimethoxyflavone isolated from Kaempferia parviflora furnished two nitro and seven amino derivatives. Among these, six new (3, 5-6, 8-10) and three known (2, 4, 7) flavonoid derivatives were synthesized. All compounds were evaluated for cytotoxicity against KB cell line using colorimetric method. Compounds 6 and 8 exhibited strong cytotoxicity with IC50 values of 6.80 and 5.84 μg/mL, respectively.

Effect of Twisted – Tape Tubulators on Heat Transfer and Flow Friction inside a Double Pipe Heat Exchanger

Sutida Phitakwinai,Wanich Nilnont,Kosart Thawichsri 국제문화기술진흥원 2015 International Journal of Advanced Culture Technolo Vol.3 No.2

Computational fluid dynamics (CFD) has been employed for the Heat exchanger efficiency of a counter flow heat exchanger. The Heat exchanger efficiency has been assessed by considering the computed Nusselt number and flow friction characteristics in the double pipes heat exchanger equipped with two types twistedtapes: (1) single clockwise direction and (2) alternate clockwise and counterclockwise direction. Cold and hot water are used as working fluids in shell and tube side, respectively. Hot and cold water inlet mass flow rates ranging are between 0.04 and 0.25 kg/s, and 0.166 kg/s, respectively. The inlet hot and cold water temperatures are 54 and 30 C, respectively. The results obtained from the tube with twisted-tapes insert are compared with plain tube. Nusselt number and friction factor obtained by CFD simulations were compared with correlations available in the literature. The numerical results were found in good agreement with the results reported in literature.

A Study on Performance comparison of two-size Tesla Turbines Application in Organic Rankine Cycle Machine

Kosart Thawichsri,Wanich nilnont 국제문화기술진흥원 2015 International Journal of Advanced Culture Technolo Vol.3 No.2

This paper aims to study and design of Organic Rankine Cycle (ORC) Machine using Isopentane as working fluid expanding through Tesla turbine. The study on ORC machine expanding through Tesla turbine has result on the efficiency of Tesla turbine. In addition, Thermodynamics theory on isentropic efficiency proved to be a successful method for overcoming the difficulties associated with the determination of very low torque at very high angular speed. By using an inexpensive experiment device and a simple method, the angular acceleration method, for measuring output torque and power in a Tesla turbine is able to predict a tendency of output work. The experiments using two Tesla turbine sizes, the first size is 1.6 bigger than the second one. In comparison with the first size, the tesla turbine can produce power output more than 62% of the second size. Further study on the machine can be developed throughout the county due to its low cost and efficiency.

A Simple Distillation Process Produce Fuel from Plastic Waste using Incorporate Heat Source

Kosart Thawichsri,Wanich nilnont 한국인터넷방송통신학회 2015 Journal of Advanced Smart Convergence Vol.4 No.1

This paper is a study of a simple distillation process. Its objective is to compare fuel production from plastic waste, its data collecting is from the factory and simple data calculated a suitable evaluation on the simple distillation plant built before calculation. The experiment with a simple distillation process is separated into three sections. The first section is a simple distillation process of distillation producing diesel using heat source by biomass. The second section is distillation process which produces fuel using heat source by burner. The third section uses heat source by burner incorporate with biomass. The experiment reveals that the result of the second section is the most efficient. In comparison with the experiments and the simple calculation, the result on the efficiency of work has error less than 5% and it is sufficient for the next experimental process. Thus, the study and design on a simple distillation process produces fuel from plastic waste has to concern mainly on design heat exchangers, flow rate and optimized temperature. Further study on this plant can be developed throughout the county due to its low cost and efficiency.

A comparing on the use of Centrifugal Turbine and Tesla Turbine in an application of Organic Rankine Cycle

Kosart Thawichsri,Wanich nilnont 국제문화기술진흥원 2015 International Journal of Advanced Culture Technolo Vol.3 No.2

This paper aims to compare the use of Centrifugal Turbine and Tesla Turbine in an application of Organic Rankine Cycle (ORC) Machine using Isopentane as working fluid expanding. The working fluid has boiling point below boiling water and works in low-temperature sources between 80-120 C which can be produced from waste heat, solar-thermal energy and geothermal energy etc. The experiment on ORC machine reveals that the suitability of high pressure pump for working fluid has result on the efficiency of work. In addition, Thermodynamics theory on P-h diagram also presented the effect of heat sources’ temperature and flow rate on any work. Thus, the study and design on ORC machine has to concern mainly on pressure pump, flow rate and optimized temperature. Result experiment and calculate ORC Machine using centrifugal Turbine efficiency better than Tesla turbine 30% but Tesla Turbine is cheaper and easily structure. Further study on the machine can be developed throughout the county due to its low cost and efficiency

A Study on Performance comparison of two-size Tesla Turbines Application in Organic Rankine Cycle Machine

Thawichsri, Kosart,nilnont, Wanich The International Promotion Agency of Culture Tech 2015 International Journal of Advanced Culture Technolo Vol.3 No.2

This paper aims to study and design of Organic Rankine Cycle (ORC) Machine using Isopentane as working fluid expanding through Tesla turbine. The study on ORC machine expanding through Tesla turbine has result on the efficiency of Tesla turbine. In addition, Thermodynamics theory on isentropic efficiency proved to be a successful method for overcoming the difficulties associated with the determination of very low torque at very high angular speed. By using an inexpensive experiment device and a simple method, the angular acceleration method, for measuring output torque and power in a Tesla turbine is able to predict a tendency of output work. The experiments using two Tesla turbine sizes, the first size is 1.6 bigger than the second one. In comparison with the first size, the tesla turbine can produce power output more than 62% of the second size. Further study on the machine can be developed throughout the county due to its low cost and efficiency.