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 act 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 = 26) and Talaad Rangsit Market (n = 5) between 29 May and 1 June 2024. Intestinal tissue samples were processed according to ISO 6887-1 guidelines, cultured on Aeromonas Selective Agar, and identified using standard biochemical tests. Colony counts (CFU/mL) were log₁₀-transformed and analyzed with non-parametric statistical tests. Aeromonas spp. were detected in 100% of samples. Median bacterial load was significantly higher in Talaad Thai (6.40 log₁₀ CFU/mL) than in Talaad Rangsit (5.86 log₁₀ CFU/mL) (p = 0.031), with significant heterogeneity among vendors (p = 0.012). 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%); half of the isolates were unclassified to species level. The universal contamination and presence of pathogenic species highlight the need for Aeromonas surveillance in Thai fish markets. 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

This analytical research aimed to examine the factors associated with the risk of accidents among elderly individuals using public restrooms in urban parks in Chonburi Province. The sample consisted of 390 participants selected through probability sampling. Data were collected using a questionnaire comprising four sections: (1) background information, (2) personal impairments, (3) unsafe public restroom–use behaviors, and (4) environmental conditions of public restrooms in parks. The instrument demonstrated a reliability coefficient of 0.71. Data were analyzed using inferential statistics, specifically the Chi-square test.

The results indicated that most elderly participants were female (61.28%); aged 60–65 years (31.03%); had a normal body mass index (52.82%); held a bachelor’s degree (34.36%); and were self-employed (35.64%). Hypertension was the most common health condition (69.49%). Within the past six months, 36.15% had experienced an accident, with bruising being the most common type of injury (12.31%). Regarding public restroom–use behaviors, most elderly individuals reported using the toilet while the floor was wet (76.67%). For the environmental conditions of public restrooms, 32.10% reported that restroom floors, toilet bowls, urinals, or mirrors were dirty and not ready for use. Factors significantly associated with the risk of accidents among elderly individuals included age, visual impairment, muscle weakness, stepping on toilet seats, and issues related to cleanliness, with statistical significance at the 0.05 level.

Based on the findings, it is recommended that elderly individuals exercise caution when using public restrooms, particularly when the floor is wet, and that relevant agencies regularly clean and improve restroom facilities to enhance safety and prevent accidents among elderly people in public parks.

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

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

This research was study to the coffee production conditions and the use of bioproducts among farmers. The population consisted of 155 coffee farmers in Song District, Phrae Province. The research instrument was an interview questionnaire. Statistical methods used for data analysis 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. The average agricultural income was 129,368.71 baht per year, while the average household debt was 49,099.35 baht per 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.

Allergenic Properties and Their Impact on Human Health: House Dust Mites

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 β-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 HDM 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

This study aimed to investigate the effects of different pasteurization conditions (temperature and time) on the quality of ready-to-drink longkong juice and its stability during storage. The experiment was divided into two parts: (1) a comparison of three pasteurization conditions, namely 65°C for 15 minutes, 85°C for 1 minute, and 95°C for 30 seconds, and (2) the study of quality changes during storage of the most significant pasteurization condition at 5±1°C for 35 days. The results showed that pasteurization conditions significantly affected the color and key compounds of the ready-to-drink longkong juice (p<0.05), except for the pH value, which showed no significant differences. Pasteurization at 95°C for 30 seconds resulted in the highest lightness (L*), while pasteurization at 65°C for 15 minutes resulted in the highest total soluble solids, total phenolic compounds, and flavonoid content. Therefore, longkong juice pasteurized at 65°C for 15 minutes was selected for further storage studies. During the first 21 days of storage, L* values increased, before decreasing at the later stages of storage. Values of a* and b* decreased over time, while pH slightly increased towards the end of the storage period (on days 28-35). The total soluble solids remained unchanged (p≥0.05). Total phenolic and flavonoid contents were highest on day 21 before decreasing on days 28 and 35. Antioxidant activity was highest on day 0 (33.47%) and significantly decreased as storage time increased. The study indicates that pasteurization at 65°C for 15 minutes preserves the key compounds in longkong juice the best. For optimal quality retention, it is recommended to consume the juice within 21 days after pasteurization at 65°C for 15 minutes to maximize beneficial compounds.

Effect of Thai Melon Flesh-to-Water Ratio on Physicochemical Properties, Antioxidant Activity, and Sensory Acceptability of Thai melon wine

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

This research aimed to investigate the effects of the Thai melon (Cucumis melo) pulp-to-water ratio in the Thai melon wine fermentation process on the physicochemical properties, antioxidant activity, and sensory acceptance of the final product. Three formulations with different Thai melon pulp-to-water ratios (w/v) were utilized: 1:1 (T1), 1:3 (T2), and 1:5 (T3). The fermentation was carried out using Saccharomyces cerevisiae Lalvin EC-118, with initial conditions adjusted to a total soluble solid (TSS) content of 22 °Brix and a pH ranging from 3.8 to 4.2. The fermentation period was 15 days. The results indicated a decreasing trend in total soluble solids. 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. Conversely, the alcohol content exhibited an increasing trend, reaching 10.80±2.30, 11.77±0.12, and 10.57±0.38% by volume, respectively, with no statistically significant differences at the 95% confidence level. Furthermore, on day 15, the pH values were 3.68±0.02, 3.22±0.07, and 2.92±0.08, while the total acidity (TA) values were 0.32±0.03, 0.29±0.03, and 0.28±0.02, respectively (p>0.05). Regarding antioxidant properties, two parameters were evaluated: total phenolic content and DPPH radical scavenging activity. Both parameters demonstrated an increasing trend over the fermentation period. On day 15, the total phenolic contents were 90.05±2.88, 72.97±7.18, and 75.63±9.84 mg gallic acid/mL. The antioxidant capacities were measured at 0.83±0.12, 0.93±0.06, and 0.93±0.07 mg Trolox/mL (p>0.05), which corresponded to inhibition percentages of 56.85±9.50, 41.84±7.78, and 33.71±9.10%, respectively. Finally, a sensory evaluation conducted 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).

การเพิ่มประสิทธิภาพการจัดเก็บและขนส่งขยะมูลฝอยในเขตเทศบาลนครสงขลาด้วยระบบสารสนเทศภูมิศาสตร์

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

This study aims to apply municipal solid waste collection route data to develop a route optimization model that passes through waste bin locations within the Songkhla Municipality area. The route analysis was conducted using Geographic Information System (GIS) technology, employing Dijkstra’s Algorithm to determine the most efficient paths. The analysis considered various factors, including traffic direction, distance, travel time, road speed limits, starting and ending points, waste bin locations, road hierarchy, and the number of traffic lanes. The results revealed that the current waste collection system consists of 10 routes, utilizing 10 waste collection vehicles, and covering a total of 599 collection points. When compared with the optimized routes generated from the analysis, the total travel distance was reduced by 23.26%, while travel time decreased by 14.78%. These findings demonstrate the effectiveness of the model in minimizing both distance and time required for waste collection operations. Furthermore, the analytical approach presented in this study can be applied to enhance the efficiency of solid waste collection and transportation in other areas, contributing to improved operational performance and resource optimization.

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 evaluation. The pH and viscosity values of Formula 1 were the most appropriate. As for the results of the analysis of the active ingredients, camphene and beta-Pinene were found, which are terpenoid substances and monoterpenes that have anti-inflammatory effects and can reduce pain. The experiment's findings demonstrate that Plai Wax, Formula 1, is suitable for further development into a potential commercial product.

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 (100-31.17 % 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.