Research on Modern science and Utilizing Technological Innovation Journal (RMUTI Journal)

The Development of Wine Using Mint Leaves Toward Consumer Acceptance

2023-11-20T09:53:01+07:00

The objective of this study was to develop formulations and flavors of wine fermented with mint leaves to meet consumer preferences. The experiment was divided into two phases. In the first phase, suitable fermentation conditions for wine production were investigated. The experimental design was created using a Central Composite Design (CCD) from the Response Surface Methodology (RSM) software. Two independent variables were studied: sugar content (^oBrix) and fresh mint leaves weight (g/600 ml). Two levels, low (-1) and high (+1), were defined for each factor using a two-level factorial design. A total of 14 experimental sets were conducted, and various parameters were measured every 3 days for 15 days. Sample 4, which used 75 g of fresh mint leaves and started with a sugar content of 22 ^oBrix, exhibited the highest alcohol content at 9.15 % and 10 ^oBrix. Sample 4 was therefore deemed suitable for further investigation in phase 2, which focused on studying the sensory acceptance of consumers towards wine fermented for 0 - 2 weeks and had its sugar content adjusted to 10, 12, 14, and 16 ^oBrix after 2 weeks of fermentation. The samples that underwent a 2-week fermentation period and had their sugar content adjusted to 12 ^oBrix showed the highest overall preference scores.

The Effect of Water Hyacinth Bio-extract on the Germination of Lettuce Seeds

2023-10-17T11:25:35+07:00

The objective of this research was to investigate the effect of water hyacinth bio-extract on the germination of lettuce seeds. Lettuce seeds were soaked in four ratios of bio-extract and distilled water: 1:250, 1:500, 1:750, and 1:1000 v/v. The soaking duration were 6, 9, and 12 hours. The germination test of the soaked lettuce seeds was performed using top of paper and field emergence methods. The results showed that the ratio of 1:750 v/v with a soaking duration 9 hours gave the highest results in both germination percentage and germination index. The germination percentage was 86.58% in both methods. The germination index by top of paper method and field emergence method were 10.68 % and 10.01 %, respectively (P<0.05). Therefore, the application of water hyacinth bio-extract could be a way to promote the germination of lettuce seeds. This could also be another way to get rid of water hyacinth and solve the water pollution problem.

Woven Fabric Properties with Different Weave Designs Using Recycled PET Yarns for Portable Chairs

2023-10-31T10:20:37+07:00

This research aimed to explore the practical use of recycled polyethylene terephthalate yarn (rPET) in technical textiles, extending its application beyond the apparel industry. The specific objective was to produce woven fabrics from rPET yarn for the seats of portable chairs, which are commonly favored for outdoor events. Initially, the process involved twisting 300 denier rPET untwisted yarn into rPET-1 (single-yarn) and rPET-2 (two-ply yarn). Six woven fabrics were then manufactured in three different weave designs (plain, twill, and basket). The warp was rPET-1 at a density of 50 ends per inch, while the weft alternated between rPET-1 and rPET-2, each at 40 picks per inch. The results indicated that fabrics with rPET-2 as the weft exhibited superior tensile and tear strength compared to those employing rPET-1 as the weft. Plain fabrics demonstrated the highest tensile strength, while twill fabrics displayed the highest tear strength. Consequently, these two fabric types were selected to produce the portable chairs, in contrast to the conventional portable chairs constructed with polyester fabric. After subjecting the chairs to a compression test with a load of 150 kgf for 5 cycles, the chair with a plain fabric and rPET-2 as the weft proved the most durable. No damage was found on the seat or frame, and fabric stretching was minimal. In essence, this research underscores the potential of rPET in the durability and sustainability of outdoor seating solutions, while also demonstrating the feasibility of applying this recycled material in technical textile applications.

A Study of Laser Ablation Simulation on Lead Telluride

2023-11-22T15:06:22+07:00

This objective of this research was to study the simulation of laser ablation on thermoelectric material (Lead Telluride: PbTe). The temperature change caused by laser beam ablation on PbTe target was simulated using both COMSOL Multiphysics 5.5 and ANSYS 2021 R1 finite element analysis software packages. The laser power varied between 10 to 40 W, while the speeds ranged from 1000 to 4000 rpm. The results showed that at any given laser speed, the local maximum temperature on PbTe increased with an increase in the laser power. The maximum temperature decreased with an increase in the laser speed at a constant laser power. The moving point heat source of laser at 20 W gave the maximum temperature, which was slightly higher than the melting point of PbTe, potentially resulting in the generation of PbTe nanoparticles. The results obtained from both software differed by about 10 %. Both software can be used to simulate completely and even more effective in the future.

Effect of Rubberwood Fly Ash on Thermal Conductivity of Cement Fiber Board

2023-11-13T08:46:38+07:00

This research aimed to investigate the influence of rubberwood fly ash on the thermal conductivity of fiber cement sheets made from cement, rubberwood fly ash, paper pulp, and banana fibers. Rubberwood fly ash was used as a replacement for cement at percentages of 0 %, 5 %, 10 %, 15 %, and 20 % by weight of the binder, while the paper pulp and banana fibers were fixed at 46 % and 1 % by weight of the binder. The water-to-binder ratio (w/b) was set at 0.6, and the thickness of the sheets was 10 mm. The sheets were molded using a semi-dry process using a hydraulic pressing machine with a force of 25 tons. The results showed that increasing of the percentage of rubberwood fly ash reduced the thermal conductivity or increased thermal insulation and also improved sound absorption properties. However, it did not significantly affectted density, compressive strength, and tensile strength perpendicular to the surface. The optimal ratio for satisfactory thermal conductivity was a mixture with 20% rubberwood fly ash, which had a thermal conductivity of 0.620 W/mK, higher than the typical cellocrete sheets with only 8 %.

Axial Compression Performance of Rectangular Concrete- Filled Steel Tubular Columns Using Environmentally Friendly Hydraulic Cement

2023-11-09T10:13:32+07:00

This paper focuses on the study of the axial load behavior and failure characteristics of rectangular concrete-filled steel tubular columns using hydraulic cement (HC-CFST columns) under concentric axial loading. The experimental specimens consisted of 36 rectangular columns, each measuring 150 x 75 mm in cross-sectional dimensions and 750 mm in height. The key variables examined in this study encompass the type of cement, the thickness of the steel tube, the ultimate compressive strength of the concrete, and curing time. Two distinct variants of cement, hydraulic cement and ordinary Portland cement, were employed at three different compressive strengths of 18, 25, and 32 MPa, with curing times of 28 and 90 days. Steel tubes were available in three thicknesses: 3.0, 4.5, and 6.0 mm. The compressive load was uniformly applied to the entire section and tested by progressively increasing the axial load until the column reached failure. According to the test results, the HC-CFST columns display linear elastic behavior up to almost 90 - 95 % of their maximum compressive loads, after which the behavior transforms nonlinear until failure. Cracking of the concrete core, as well as local buckling of the hollow steel tube, were observed as modes of failure in the HC-CFST columns. The PC-CFST columns demonstrated a maximum compressive load that was approximately 1 - 2 % higher than that of the HC-CFST column at 28 days of curing. Nevertheless, for 90 days, the HC-CFST columns exhibited a greater maximum compressive load compared to the PC-CFST column due to the presence of pozzolanic components in the HC-based concrete instead of clinker. In addition, it has been observed that the ACI design equations are capable of accurately predicting the maximum compressive load of the HC-CFST columns. (Cont)

The Study of the Reinforced Masonry Walls with Bamboo under the Pendulum Test

2023-11-29T14:03:57+07:00

The objective of this research was to study the reinforced masonry walls with bamboo under the pendulum test. A total of 6 samples of masonry walls were tested, with an average size of 600 x 600 mm, consisting of 1) non-plastered Mon brick wall (CT1), 2) plastered Mon brick wall (CT2), 3) reinforced masonry wall with bamboo at a distance of 50 mm (W1), 4) reinforced masonry wall with bamboo at a distance of 100 mm (W2), 5) reinforced masonry wall with bamboo at a distance of 150 mm (W3), and reinforced masonry wall with bamboo at a distance of 200 mm (W4). Assessments were performed using the pendulum test with application angles ranging from 5 to 90 degrees. The results found that samples CT1, CT2, W1, W2, W3 and W4 had impact load values of 9.04, 21.33, 39.2, 34.28, 26.92, and 25.01 N.m, respectively. For the control sample CT2, it was shown that plastering the masonry wall resulted in a 2.36 times higher impact load when compared with sample CT1. In addition, when comparing the masonry wall samples reinforced with bamboo at a distance of 50 to 200 mm with the CT2 sample, it was found that walls W1, W2, W3, and W4 had 1.83, 1.61, 1.26, and 1.17 times higher impact load, respectively. Thus, it can be concluded that reinforcement using the reinforced masonry walls with bamboo significantly increased the impact load.

Optimization in the Cotating Thermistor Sensors Using the Principle DMAIC

2023-11-30T09:45:20+07:00

An Optimization in the coating thermistor sensors using the principle DMAIC. have objective In order to Optimization the coating of the thermistor sensor surface using the principle DMAIC. By improving the working method according to the DMAIC principle, it was found that the amount of coating solution used was too much left over from the container used to hold the dipping solution. So a new design was made.The research found that A new tray with a volume of 170,100 cubic millimeters. 200.20 grams of coating solution. The change of container size caused the coating to decrease by 30 % usage73.63 grams of coating per 1,000 pieces. Design Simulate find Optimization value the break-even point is 3,600 pieces, 30 times. The amount of coating used is 465.40 grams coating 56.98 %. The use of 93,427coatings was 8,335.13 grams using coatings of 5,732.53 grams or 68.71 % of coatings compared with 47.67 % of coatings. The difference was 21.04 %. The optimal formulation was Z min = 200.20 + 8.84X.