Journal of Science and Technology CRRU

On the Diophantine Equation 3^x+n^y=z^2, where 𝒏≡𝟐 (𝐦𝐨𝐝 𝟑)

Nattawat Samaapat — 2025-12-17

In this research, we investigated all solutions of the Diophantine equation , where are non-negative integers and is a positive integer such that , by using Mihăilescu’s Theorem and Leu and Li’s Theorem. The research findings revealed that the Diophantine equation has all solutions, which are .

Adoption of Cassava Production Technology by Farmers in Dilang Subdistrict, Phatthana-Nikhom District, Lopburi Province

Itthipol Chaiwong — 2025-12-17

This research aims to study: 1) The adoption of cassava production technology by farmers 2) Problems and suggestions regarding the adoption of cassava production technology by farmers. The research is survey research. The population studied consisted of 264 registered cassava farmers in Dilang Subdistrict, Phatthana Nikhom District, Lopburi Province, registered with the Department of Agricultural Extension for the year 2023. A sample group of 159 farmers was determined using Taro Yamane's formula at a 0.05 margin of error and selected through simple random sampling. Data were collected using structured interviews and analyzed by employing descriptive statistics and multiple regression analysis. The research found that farmers had an average age of 58.72 years, completed primary education, and were members of the Bank for Agriculture and Agricultural Cooperatives (BAAC). They had an average of 16.51 years of experience in cassava cultivation, with an average cultivation area of 14.82 rai. The average income from cassava production was 106,421.38 Baht/year, and the average production cost was 3,163.58 Baht/rai. Farmers relied on rainwater for cassava cultivation. The planting season was at the beginning of the rainy season. The variety most commonly used was “Khaek Dam” (Black Foreigner). Suitable soil conditions were sandy loam. Before planting, soil improvement was done using manure, compost, and green manure. Land preparation involved single-row plowing. Farmers kept their own stem cuttings for propagation, planting them at a spacing of 0.8 x 0.8 meters using manual labor. The multiple regression analysis indicated that key factors influencing the adoption of cassava production technology among farmers were labor availability, production income, and debt level.

On the Diophantine Equations p^x+(p+30)^y=z^2

Krerkchai Jaimano — 2025-12-17

This research investigates the non-negative integer solutions to the Diophantine equation , specifically for the case where is not a multiple of . Under this condition, we prove that the equation has a unique non-negative integer solution at . The proof is based on the analysis of parity, divisibility properties, modular arithmetic, and Mihăilescu's Theorem. The result indicates that imposing specific conditions on variables can lead to a definite solution for a complex Diophantine equation, suggesting a potential approach for studying the equation in more general forms.

Effects of Using Compost from Vegetable Waste on the Growth of Chinese Celery

Apichaya Phadpin — 2025-12-17

This study aimed to study the appropriate ratio of compost fertilizers from vegetable scraps from fresh markets is important for the growth of Chinese celery. Applying vegetable scraps as main carbon sources and soil as bacterial energy sources. Vegetable wastes from Kamphaeng Phet Province, Thailand were composted to reduce wastes accumulation in environment. Soil per vegetable waste ratios were varied from 1:1, 1:3 and 1:5, respectively. At 49-day decomposition periods, physical and chemical characteristics of compost fertilizers were analyzed. Compost fertilizer from ratio 1:3 represented the best decomposition suitable for soil improvement (P<0.05). Ratio 1:3 fertilizer contained C/N ratio at 15.96, macronutrient; TN, P₂O₅ and K₂O less than criteria of compost fertilizer standard with Secondary micronutrients; Ca and micronutrients; Zn more than initial decomposition stage. But when planted with Chinese celery, it was found that using 1:1 fertilizer made Chinese celery grow the best, both in terms of fresh weight and survival.

Study of Mechanical Properties of Clay Bricks Reinforced with Agricultural Waste Materials : A Comparison Between Rice Husk Bran, Rice Straw, Bamboo Leaves and Lemongrass Leaves of Villagers in Village No. 4, Nangua Subdistrict, Mueang District, Phetchabun Province

Manit Noibua — 2025-12-17

This research aims to study and compare the mechanical properties of brick blocks made from clay-sand soil reinforced with agricultural waste materials, namely rice husk bran, dry rice straw, dry bamboo leaves, and dry lemongrass leaves. The clay-sand soil was fermented with water for 1 - 2 days before being mixed with the reinforcing materials in specified proportions. The mixtures were then molded into brick blocks, and their strength was tested by throwing them from a height of 1 meter a total of 3 times. The experimental results showed that the brick block reinforced with chopped dry bamboo leaves, 2 - 3 cm. in length (Formula 3), had the highest strength and did not break after being thrown from a height of 1 meter. In contrast, the brick reinforced with rice husk bran (Formula 1) started to show minor cracks after the second throw, while the brick with dry rice straw (Formula 2) broke into 2 pieces on the first throw. The brick block reinforced with dry lemongrass leaves (Formula 4) showed increased cracking after the second throw. The study concludes that reinforcement with chopped dry bamboo leaves, 2 - 3 cm. in length, significantly increases the strength and durability of clay-sand brick blocks, offering a suitable and cost-effective alternative for construction in line with the Khok Nong Na model.

Evaluation of Harvest Index from Buccaneer Avocado

Surangrat Punsaeng — 2025-12-17

Avocado (Persea americana Mill.), a perennial tree belonging to the family Lauraceae, produces mature fruits with dark skin and soft green fruit pulp. A major challenge for farmer due to determining the appropriate harvest maturity. The conventional practice of relying on changes in skin color is not always reliable, as some cultivars do not exhibit clear external changes when fruits reach maturity. Consequently, fruits may be harvested prematurely by the farmer, leading to products that cannot ripen property and are unsuitable for consumption. This study aimed to evaluate harvest indices in relation to postharvest quality of Buccaneer avocado fruits. Fruits were harvested at 120, 140, 160, and 180 days after attachment of fruit with 6 fruits per maturity stage. They were divided into two groups: group 1; unripe fruits, analyzed immediately for physical and chemical attributes. Group 2; ripe fruits, obtained by storing unripe fruits at ambient temperature for 5 days prior to analysis. The results on physical analysis indicated that unripe fruits exhibited increasing weight, size and dry matter content with advancing maturity, but moisture content declined significantly. Peel and pulp color, as well as flesh firmness, remained relatively constant at harvest. Fruits after ripening, most physical attributes decreased, with the most distinct change being the peel color, which shifted from dark green to dark brown. Fresh color showed only slight variation, maintaining a light yellowish-green appearance. It was concluded that harvesting Buccaneer avocado at 160 - 180 days after attachment of fruits optimal, as fruits at these stages can be successfully ripened and consumed.

The Number of Endomorphism of Barbell Graphs

Bawornrat Somsri — 2025-12-17

A barbell graph is formed by connecting two complete graphs, namely K_n and K_n' , with a bridge. This research aims to determine the total number of endomorphisms of barbell graphs. We demonstrate that endomorphisms are divided into four distinct classes: End(K_n,K_n'), End(K_n',K_n), End(K_n,K_n) and End(K_n',K_n'). By enumerating the elements within each class, we derive a formula for the total number of endomorphisms of ,

Antioxidant Capacity and Total Phenolic Content of Sacha Inchi Seeds and Shells

Maneerut Yarung — 2025-12-17

This research was study of antioxdant activity and Phenolic contents in extracts from different parts of Sachi inchi (seed and shells). This study was using 1,1-Dipheny-2-picrylhydrazyl radicals (DPPH) radical scavenging assay and Folin – ciocalteu method. The results found that the maximum antioxidant activity obtained from Sachi inchi shells extracts IC₅₀ value of 0.43 (±0.01) mg/ml and secondary was the Sachi inchi seed extracts IC₅₀ value of 0.63 (±0.02) mg/ml and comparison of IC₅₀ value shells extracts. Phenolic contents found that the maximum Phenolic content was Sachi inchi shells 3.26 (±0.03) มก. GAE/g dry weight and secondary was the Sachi inchi seed 0.59 (±0.02) มก. GAE/g dry weight. Antioxidant activity (DPPH assay) extracts from different parts of Sachi inchi (seed and shells) were correlated directly proportional to Phenolic contents.

Effects of KWDL-Based Learning on Problem-Solving in Surface Area and Volume among Grade 8 Students

PIyada Phosri — 2025-12-17

The objective of this study was to enhance analytical thinking and mathematical problem-solving skills related to surface area and volume by employing the KWDL technique. The sample consisted of 49 students from Mathayom 2/3 at the Demonstration School of Thepsatri Rajabhat University, selected through cluster random sampling. The instructional intervention was implemented using learning activities based on the KWDL technique. Students’ learning outcomes were assessed using an achievement test on surface-area and volume word problems, and their satisfaction with the learning activities was measured through a satisfaction questionnaire. The findings revealed that students’ post-instruction achievement scores were significantly higher than their pre-instruction scores at the .05 level. Furthermore, the students reported a high level of satisfaction with the KWDL-based instructional activities.