Research Journal Phranakhon Rajabhat : Science and Technology

EFFECTS OF WATER LILY AND HERBAL POWDER RATIO ON QUALITY OF HERBAL TEA

Sat, 28 Jun 2025 00:00:00 +0700

The objective of this work was to study the effect of water lily powder and herb powder on the quality of herbal tea. The results showed that the water lily dried at 45ºC had moisture, water activity contents, L*, a*, and b* of 3.92%, 0.57, 53.40, 9.86, and -2.91, respectively. The water lily
powder had total phenolic content, antioxidant activity, and total anthocyanin content of 74.42 mg GAE/g sample, 273.24 mg TEAC/g sample, and 18.46 µg cyanidin-3-glucoside/g sample, respectively. The effect of water lily powder and herb powder on the quality of herb tea was
analyzed. The ratio of the water lily powder to the herb powder (pandan, luo hau guo, chrysanthemum, and roselle) was equal to 50:50 (%) and 100% of the water lily powder in the control of the herb tea formulation. The water lily powder tea mixed with chrysanthemum had the highest overall score in appearance, color, odor, and taste compared to the other herb teas. The water lily power tea
mixed with chrysanthemum had a higher total phenolic content than the other herb teas. The water lily powder tea and water lily powder mixed with rosella had high antioxidant activity, but the odors, taste, and the overall score was rather low. The total anthocyanin content of water lily powder tea and herbal tea treatments was not significant in the total anthocyanin content. Therefore, the water lily powder and herb powder can be potentially developed as a natural phenolic content material.

STUDY OF TEMPERATURE CONTROL INSIDE A PARABOLIC SOLAR DRYER USING A THERMOSTAT

Sat, 28 Jun 2025 00:00:00 +0700

The use of solar drying equipment for agricultural products offers several advantages, including prolonging product shelf life, better control of product quality in terms of cleanliness and hygiene, and reducing energy costs, thereby increasing farmers’ income. Currently, various
types of solar dryers are available to suit different agricultural products. However, the use of solar dryers without climate temperature control systems during periods of high solar radiation can cause internal temperatures to reach up to 70°C, which may be unsuitable for drying certain products that do not require high temperatures. This research aims to study the use of thermostats to control the speed of the exhaust fan in a parabolic-shaped solar dryer measuring 1.5 x 2.0 square
meters. The control system operates on the following principle: when the internal temperature exceeds the set thermostat temperature, the fan operates at maximum speed to expel hot air. And when the internal temperature drops below the set point, the fan will slow down. The study
was conducted from January 7 to January 19, 2025, with thermostat settings at 30, 35, 40, and 45°C. The results showed that the dryer could effectively control the internal temperature at 40 and 45°C. Therefore, solar dryers equipped with thermostat-based temperature control can be suitable for drying certain products that do not require excessive temperatures while maintaining optimal drying conditions. This control method also ensures more uniform drying processes.

EFFECT OF HATHA YOGA ON STRESS AND SALIVARY CORTISOL LEVEL

Pithpicha Pipattadeasorn, Kraisorn Ammawat, Monruadee Keeratipranon — Sat, 28 Jun 2025 00:00:00 +0700

This study aimed to examine the effects of Hatha yoga practice on stress levels and salivary cortisol in women aged 20–50 years with moderate to high stress levels. The hypothesis was to analyze whether Hatha yoga practice could reduce stress and cortisol levels. This research
employed a one-group pretest-posttest experimental design. The sample consisted of 28 participants who practiced Hatha yoga for 1 hour from 7:30 to 8:30 a.m. on a single day at the same place. Data were collected using the SPST-20 stress questionnaire and a salivary cortisol test kit. Data analysis included frequency, percentage, mean, standard deviation, paired t-test, and correlation analysis.
The results showed a statistically significant reduction in stress levels, with the average stress score decreasing from 52.29 (SD = 13.55) before Hatha yoga practice to 33.57 (SD = 11.13) after Hatha yoga practice (p < 0.05). Salivary cortisol levels showed a slight but non-significant reduction, with an average of 5.37 nmol/dL (SD = 2.81) before Hatha yoga practice and 4.75 nmol/dL (SD = 4.15) after Hatha yoga practice. However, among participants with high stress levels, both stress and cortisol levels significantly decreased after Hatha yoga practice (p < 0.05).

DIGITAL FORENSIC ANALYSIS OF DATING APPLICATIONS IN THAILAND ON ANDROID USING THE INVESTIGATION MODEL OF DIGITAL FORENSIC RESEARCH WORKSHOP 2001

Praveen Maiget, Kanyanut Suriyan — Sat, 28 Jun 2025 00:00:00 +0700

This research aims to analyze digital forensic evidence obtained from the dating applications ThaiFriendly and ThaiCupid openrating on the Android platform using the investigation model of DFRW2001. The model consists of six phases: identification, preservation, collection, examination, analysis, and presentation. The digital forensic tools utilized were MOBILedit and Oxygen. The study simulated four scenarios data, including non-deleted data, messages deleted, data deleted with uncleared cache, and data deleted with cleared cache. This approach aimed to evaluate the effective of the tools. The findings revealed that MOBILedit demonstrated higher accuracy than Oxygen, achieving an average accuracy of 100% when data was not deleted and 83.33% when data was deleted but the cache remained uncleared. In comparison, Oxygen also achieved 100% accuracy when data was not deleted but dropped to 66.66% and 50% in scenarios where data was deleted with an uncleared cache. However, when data and cache were fully cleared, the accuracy of both tools dropped to 0%, highlighting their limitations in complex scenarios. This study highlights the imperative need for the development of more robust tools and the enhancement of data recovery techniques to enhance the comprehensiveness and accuracy of digital forensic investigations in the future.