Rajamangala University of Technology Tawan-ok Research Journal

Landscape Architecture for Creative Cultural Tourism Cities: Khung Samphao Subdistrict, Manorom District, Chai Nat Province

2026-01-15T11:32:36+07:00

This study aims to assess the landscape architectural potential of the study area and to develop landscape design guidelines that promote the city as a creative cultural tourism destination. The research employs a mixed-methods approach, integrating field surveys using mapping techniques, participant observation, and activity mapping, together with the collection of spatial coordinates of cultural and landscape resources through Global Positioning System (GPS) tools. Spatial data analysis is combined with a review of cultural capital–related literature and the interpretation of satellite imagery using Geographic Information Systems (GIS) to synthesize area potential through the overlay of physical characteristics and perceptual dimensions. Design proposals are formulated with a focus on pilot areas in Khung Samphao Subdistrict, where tourism routes and landscape structures are developed as demonstrative interventions. The findings indicate that Manorom district holds significant potential for tourism route development, as reflected in the density of cultural resources, the continuity of riverfront and agricultural landscapes, and the capacity to spatially connect key sites through an integrated tourism network. Three types of creative cultural tourism routes are identified: (1) historical routes, (2) local agricultural livelihood routes, and (3) routes related to traditions and beliefs. Landscape design proposals in the pilot areas demonstrate the feasibility of enhancing public spaces to support recreation, learning, and tourism activities. The results underscore the importance of integrating landscape architectural knowledge with spatial and cultural data to strengthen urban identity and guide Manorom toward becoming a creative cultural tourism city. This study contributes an integrative framework that links spatial analysis, qualitative insights, and landscape design for community-based creative cultural tourism development, while the proposed design guidelines offer practical direction for agencies seeking to develop tourism areas aligned with local identity, cultural values, and long-term sustainability.

Adaptation of Bio-extract Technology for Rice Stubble Management among Farmers: A Case Study in Tha Chanuan Subdistrict, Kong Krailat District, Sukhothai Province

2026-01-28T13:55:54+07:00

The objectives of this research were to study 1) the socio-economic characteristics of farmers, 2) adaptation of the use of bio-extract for rice stubble decomposition by farmers, and 3) the problems and recommendations related to adaptation of the use of bio-extract for rice stubble decomposition by farmers. The population of this study consisted of rice farmers registered with the Department of Agricultural Extension in the 2024/2025 production year in Tha Chanuan Subdistrict, Kong Krailat District, Sukhothai Province totaling 310 farmers. A sample size of 175 respondents was selected. The results revealed that the majority of farmers were female, with an average age of 52.59 years and an average farming experience of 20.46 years. Overall, 80.6% of farmers did not adopt the use of bio-extract for rice stubble decomposition. Farmers encountered production-related problems, including a lack of appropriate equipment such as fermentation tanks. In terms of extension and dissemination, it was recommended that model farmers be encouraged to share their direct experiences, as this would help build credibility and increase adaptation among other farmers.

Effects of Seed Priming on Germination and Seedling Vigor of Korean Perilla (Perilla frutescens var. frutescens)

2026-01-28T13:25:39+07:00

The objectives of this study were to evaluate the effectiveness of seed priming treatment on Perilla frutescens var. frutescens, a species known for its low germination rate and dormancy which hinders propagation and commercial production. The experiment was designed in a completely randomized design that composed of five treatments with 3 replications, each replication contained 40 seeds and soaking for 15 min such as non-soaking seed (Control), Soaking in tap water at room temperature, potassium nitrate, lemon juice and gibberellic acid. The Results showed that potassium nitrate has the highest germination percentages during 7, 14 days and 21 days with averages of 38.33 %, 75.50 %, and 75.50%, respectively, and also has the highest germination index. Lemon juice shows the results similar to potassium nitrate. Gibberellic acid was less effective in initiating germination but significantly enhanced post-germination growth for stem height. However, no significant differences were observed in root length, leaf length, weight and leaf number. According to the result, potassium nitrate is suitable for stimulating on var. frutescens with low germination rates and lemon juice presents a viable option for organic farming, while gibberellic acid is recommended to promote seedling growth after germination.

Retailer-Level Heterogeneity in Aeromonas Loads among Nile Tilapia at Thai Wholesale Markets

2026-03-02T11:44:30+07:00

Aeromonas spp. are opportunistic pathogens commonly found in aquatic environments and are capable of causing gastrointestinal and systemic infections in humans. Nile tilapia (Oreochromis niloticus), a widely consumed freshwater fish in Thailand, may serve as a reservoir for these bacteria. Although contamination in aquaculture and retail markets has been reported, data on retailer-level variability in wholesale markets remain scarce. This study investigated the prevalence, bacterial load, and species composition of Aeromonas spp. in fresh Nile tilapia sold by individual retailers at two wholesale markets in Pathum Thani Province, Thailand. A total of 32 fish were collected from 19 vendors at Talaad Thai Market (n = 27) and Talaad Rangsit Market (n = 5) between 29 May and 1 June 2024. Intestinal tissue samples were analyzed for Aeromonas spp. loads according to ISO 6887-1 guidelines using selective media. Results were reported in log CFU/g and analyzed with non-parametric statistical tests; subsequently, isolates were identified to the species level using biochemical tests. Aeromonas spp. were detected in 100% of samples. Median bacterial loads did not differ significantly between markets (5.86 log CFU/g, IQR 5.13–7.18; p = 1.00), yet characterized by significant heterogeneity among vendors (p = 0.010). Among 42 isolates, A. hydrophila was most common (26.2%), followed by A. caviae (9.5%), A. eucrenophila (7.1%), A. sobria (4.8%), and A. popoffi (2.4%), respectively; half of the isolates were identified only to the genus level. The high prevalence and presence of potentially pathogenic species suggest that enhanced surveillance and monitoring programs for Aeromonas in Thai fish markets should be considered to further ensure food safety. Vendor-level hygiene interventions, molecular species identification, and antimicrobial resistance profiling are recommended to strengthen food safety in aquaculture distribution.

Factors Associated with the Risk of Accident Occurrences Among Elderly People Using Public Restrooms in Urban Public Parks, Chonburi

2026-03-26T14:11:42+07:00

Accidents in public toilets represent a significant health concern that severely impacts the well-being of the elderly, particularly in urban areas. This cross-sectional analytical research aimed to investigate factors associated with the risk of accidents among elderly individuals using public toilets in urban parks in Chonburi Province. The sample consisted of 390 elderly participants selected through computer-based simple random sampling. Data were collected using a questionnaire with a reliability coefficient of 0.71-0.88. Data were analyzed with descriptive statistics (frequency, percentage, mean, and standard deviation) and inferential statistics (Chi-square test). The results showed that the majority of participants were female (61.28%), and aged less than 75 years (75.13%). Within the past six months, 36.15% of participants had experienced an accident, with bruising being the most common injury (12.31%). Regarding risky behaviors, using the toilet while the floor was wet was the most prevalent (76.67%), and 32.10% reported environmental issues related to unready or poorly maintained facilities. Statistical analysis revealed that age, visual impairment, muscle weakness, the behavior of squatting on the toilet seat, and the cleanliness of the public toilet environment were significantly associated with accident risk at a 0.05 level of significance. The findings indicate that accident risks stem from both individual and environmental factors. Therefore, relevant authorities should prioritize improving cleanliness standards, installing standardized anti-slip materials, and promoting safe toilet usage behaviors to mitigate risks and enhance the safety of the elderly in urban areas.

Coffee Production and the Use of Bioproducts among Farmers in Song District, Phrae Province

2026-03-02T09:31:59+07:00

This research aimed to study the coffee production conditions and the use of bioproducts among farmers. The sample consisted of 155 coffee farmers using simple random sampling in Song District, Phrae Province. The research instrument was an interview questionnaire. Statistical methods included frequency, percentage, mean, standard deviation, and ranking. The results found that most farmers were female, with an average age of 52.79 years. The average number of laborers was 2.52 persons per household. Farmers had an average of 3.45 years of experience in coffee cultivation. Average agricultural income was 129,368.71 baht/year, while household debt averaged 49,099.35 baht/year. Farmers mainly cultivated Robusta coffee. Regarding the use of bioproducts in coffee production, it was found that farmers used Trichoderma fungi mixed with seedling substrates or applied in planting holes to prevent root rot disease. Farmers expressed the need for reliable sources for purchasing Trichoderma fungi and for regular hands-on training provided by relevant agencies. Recommendations concerning the use of Trichoderma included organizing training programs to enhance farmers’ knowledge and understanding of its application, as well as supporting farmers in producing biological control agents for use within the community.

Allergic Diseases in Humans Caused by House Dust Mite

2026-04-10T11:55:29+07:00

House dust mites (HDMs) are microscopic arthropods recognized as a major source of indoor allergens worldwide, contributing substantially to allergic diseases such as asthma, allergic rhinitis, allergic conjunctivitis, and atopic dermatitis. Their remarkable environmental adaptability facilitates persistence in domestic settings and continuous production of allergens, including cysteine protease (Der p1), chymotrypsin (Der p6), and tropomyosin (Der p10), as well as microbial components such as lipopolysaccharides and beta-glucans, which enhance allergenicity and modulate immune responses. These allergens activate epithelial and immune cells, promoting type II inflammation that underlies the pathogenesis of allergic disorders. This review consolidates current knowledge of HDMs biology, geographic distribution, allergen profiles, immune mechanisms, and clinical manifestations, while highlighting recent advances in diagnostic and therapeutic approaches. Literature was systematically reviewed from databases including Google Scholar, PubMed, and Scopus using the keywords “house dust mite,” “allergens,” “inflammation,” and “treatment”. A comprehensive understanding of HDMs and their allergenic properties is critical for the development of more effective therapeutic strategies and the improvement of patients’ quality of life.

Effects of Pasteurization Conditions on Quality and Storage Stability of Ready-to-Drink Longkong Juice

2026-02-27T10:53:41+07:00

Longkong is a fruit rich in bioactive compounds; however, it is highly susceptible to quality deterioration after processing. Therefore, appropriate pasteurization conditions are required to maintain the quality and stability of ready-to-drink longkong juice. This study aimed to (1) compare three pasteurization conditions: 65 degrees Celsius for 15 min, 85 degrees Celsius for 1 min, and 95 degrees Celsius for 30 s; and (2) evaluate quality changes in the selected condition during storage at 5±1 degrees Celsius for 35 days. The results showed that pasteurization conditions significantly affected juice quality (p < 0.05), except for pH. Pasteurization at 95 degrees Celsius for 30 s resulted in the highest lightness (L*), whereas 65 degrees Celsius for 15 min preserved the highest total soluble solids (TSS), total phenolic content, and total flavonoid content. The condition of 65 degrees Celsius for 15 min was selected for the storage study. During the first 21 days, L* value and phenolic and flavonoid contents increased, followed by a gradual decline. In contrast, redness (a*), yellowness (b*), and antioxidant activity decreased over time. The pH changed slightly, while TSS remained stable (p ≥ 0.05). In conclusion, pasteurization at 65 degrees Celsius for 15 min is the most suitable condition for preserving the bioactive compounds in longkong juice, and the product should be consumed within 21 days to obtain maximum benefits.

Effect of Thai Melon Pulp-to-Water Ratio on Physicochemical Properties, Antioxidant Activity, and Sensory Acceptance of Thai Melon Wine

2026-05-08T14:04:58+07:00

This research aimed to study the effect of the Thai melon (Cucumis melo) pulp-to-water ratio on the physicochemical properties, antioxidant activity, and sensory acceptance of Thai melon wine. Three formulations with different Thai melon pulp to water ratios (w/v) were used: 1:1 (T1), 1:3 (T2), and 1:5 (T3). The fermentation was conducted using Saccharomyces cerevisiae Lalvin EC-1118, with the initial conditions adjusted to a total soluble solids (TSS) content of 22 °Brix and a pH ranging from 3.8 to 4.2 for a period of 15 days. The results showed a decreasing trend in TSS; at the end of the 15-day fermentation process, the TSS values for the three formulations were 8.30±1.65, 7.10±0.10, and 5.53±0.59 °Brix, respectively. The alcohol content exhibited an increasing trend, reaching 10.80±2.30%, 11.77±0.12%, and 10.57±0.38% (v/v) on day 15, respectively, with no statistically significant difference at the 95% confidence level. On day 15, the pH values were 3.68±0.02, 3.22±0.07, and 2.92±0.08, and the titratable acidity (TA) values were 0.32±0.03%, 0.29±0.03%, and 0.28±0.02% (w/v), respectively (p≥0.05). Two parameters of antioxidant activity were investigated: total phenolic content and DPPH radical scavenging activity. Both values tended to increase over time. On day 15, the total phenolic contents were 90.05±2.88, 72.97±7.18, and 75.63±9.84 mg GAE/mL, and the antioxidant capacities were 0.83±0.12, 0.93±0.06, and 0.93±0.07 mg TE/mL (p≥0.05), which accounted for inhibition percentages of 56.85±9.50%, 41.84±7.78%, and 33.71±9.10%, respectively. The sensory evaluation by 30 panelists revealed that the scores for color, odor, taste, and overall liking for all three formulations were at a moderate level (p≥0.05).

GIS-Based Network Analysis for Enhancing Municipal Solid Waste Collection and Transportation Efficiency in Songkhla Municipality, Thailand

2026-03-13T14:14:06+07:00

Municipal solid waste collection in urban areas often suffers from inefficient routing, including overlapping routes and excessive travel time. This study aims to improve the efficiency of waste collection routes in Songkhla Municipality by integrating Geographic Information Systems (GIS) with network analysis and Dijkstra’s algorithm. The cost function incorporates operational variables, including travel distance, time, speed, and stop time, to better reflect real-world conditions. The dataset consists of 599 waste collection points and 10 routes. The road network was modeled as a directed graph with constraints such as one-way streets, median-divided roads, and U-turn restrictions. Optimal routes were then computed and compared with the existing routes. The results show that the total travel distance was reduced from 138.743 to 118.629 km (14.50%), and the total operation time was reduced from 26 h 35 min to 20 h 28 min (23.01%). These reductions were statistically significant (p < 0.05). The findings indicate that an operationally optimal route is not necessarily the geometrically shortest path. The novelty of this study lies in integrating field-based data and real-world network constraints into the model, enhancing both realism and practical applicability. However, the model is limited by the use of static traffic data. Future work should incorporate real-time traffic data and advanced approaches such as the Vehicle Routing Problem (VRP) and Geo-AI. The results can support decision-making for local authorities in route planning and waste management operations.

Formulation and Evaluation of Herbal Ointments Containing Zingiber montanum Extract

2026-04-20T17:14:28+07:00

The Integration local herbs with the use of innovation and technological knowledge to create products that have the identity of the community. It is considered one of the sustainable local developments. This brings benefits to the community in terms of generating income, self-reliance and economic strength of the community. This research aims to formulate and evaluate herbal ointments containing Zingiber montanum extract. Z. montanum are herbs that can be found in the local area and it used to create medicinal recipes based on traditional folk wisdom. Then evaluate the product, including evaluating physical characteristics, pH value, viscosity and analysis of active ingredients in herbal ointments using (Gas Chromatograph - Mass Spectrometry, GC/MS) method. The research results found that ointments containing Z. montanum extract in all 4 formulas had no different physical characteristics. However, the formulation consisting of Z. montanum extract, beeswax, white soft petrolatum, lanolin, cetearyl alcohol, borneol, camphor, menthol, and methyl salicylate in a ratio of 7.5%, 2.5%, 42.5%, 2.5%, 2.5%, 5.0%, 5.0%, 25.0%, and 7.5%, respectively, exhibited the most suitable pH and viscosity values. Furthermore, the active ingredient analysis revealed the presence of Camphene and beta-Pinene, which are terpenoids and monoterpenes with anti-inflammatory and analgesic (pain-relieving) properties. Consequently, this formulation is highly suitable for further commercial development in the future.

Gasoline Detection in Fire Debris Using SPME–GC–MS: Evaluating the Sampling Time Window

2026-03-16T14:10:15+07:00

Arson is a severe criminal act that often results in significant property damage and poses challenges for forensic investigation, particularly in the recovery of physical evidence from fire debris. Gasoline is commonly used as an ignitable liquid in arson cases. This study aimed to investigate the detection of gasoline residues in burned materials and the temporal window for sample collection. Fabric piles (20 × 20 × 15 cm) were soaked with 1 liter of gasoline and ignited, allowing uncontrolled burning for approximately 30 minutes before extinguishment with water. Post-fire debris samples (1 × 1 cm) were collected in 20 mL headspace vials and analyzed using solid-phase microextraction coupled with gas chromatography–mass spectrometry (SPME–GC–MS). Ion chromatogram analysis revealed that gasoline could be identified based on the presence of characteristic peaks, including heptane, toluene, octane, ethylbenzene, xylenes, benzene derivatives, and naphthalene. Gasoline vapors were most abundant within the first 1–3 hours after extinguishment (100-30.17 % Relative Residues) but remained detectable up to 72 hours post-fire (16.82 % Relative Residues). This method demonstrates effective applicability for detecting residual gasoline in fire debris, providing a reliable approach for forensic arson investigations.

The Detection of Latent Fingerprints Using PCS Gel on Dark-Colored Aluminum Surfaces

2026-06-19T16:35:30+07:00

Currently, the crime rate in Thailand is rising, and forensic evidence plays an increasingly important role in the justice process. Latent fingerprints are a crucial piece of forensic evidence often found at crime scenes. This research aims to detect latent fingerprints on dark-colored metal surfaces using Electrolyte Gel (PCS Gel) and to study the use of multi-wavelength flashlights to enhance the clarity of fingerprint images. In this study, dark-colored metal surfaces, specifically taupe-colored aluminum sheets and black aluminum sheets, were used for experiments. Various formulations of electrolyte gel were prepared and used, including potassium permanganate, calcium chloride, and silica powder (PCS gel), to detect latent fingerprints on both colors of aluminum surfaces. The results showed that good-quality fingerprints were obtained using the PCS gel, which consisted of 2.5 % w/v potassium permanganate, 0.5% w/v calcium chloride, and 5 grams of silica powder in the total volume of 10 ml solution, with an optimal development time of 25 minutes. For capturing images of latent fingerprints on dark-colored surfaces, the use of multi-wavelength flashlights emitting blue light (λ = 450 nm) significantly improved the visibility of latent fingerprints and the identification of key minutiae features in low-light conditions. The findings from this research can be applied to forensic science, especially for objects with dark metal surfaces in real-life cases.