https://ph01.tci-thaijo.org/index.php/rmutijo/issue/feed Research on Modern science and Utilizing Technological Innovation Journal (RMUTI Journal) 2024-04-30T16:01:09+07:00 Assoc. Prof. Narongsak Yotha, Ph.D. rmuti.j@gmail.com Open Journal Systems <div style="color: blue; display: block; background: #f2a41e;"> <h3 style="text-align: center;"><span style="color: blue;">Research on Modern science and Utilizing Technological Innovation Journal (RMUTI Journal)</span></h3> </div> <h4 style="text-align: center;">ISSN 3027-6756 (Online)</h4> <p><strong><span style="color: red;">Old name: </span><span style="color code: #716f6e;">RMUTI JOURNAL Science and Technology</span></strong></p> <p>It is a quarterly publication with three issues released annually:</p> <ul> <li>Issue 1: January - April</li> <li>Issue 2: May-August</li> <li>Issue 3: October - December</li> </ul> <div style="color: blue; display: block;"> <h4 style="text-align: center;"><strong>Peer Review Process</strong></h4> <h5 style="text-align: center;"><em>All submitted manuscripts are conducted by specialists in relevant disciplines and with knowledge from diverse institutions. Furthermore, they are both affiliated and unaffiliated with the three authors. The peer review is undertaken by professionals, and the authors are unaware of each other’s identity. This ensures that both authors and reviewers remain anonymous. (double-blind review)</em></h5> </div> <p> </p> <p><strong>Focus and Scope</strong> The journal encompasses <strong>research articles</strong> and <strong>academic articles</strong> submitted by authors from the institution’s internal and external departments. The focus is on accepting publications in the Physical Sciences within the following areas of study:</p> <ul> <li>Chemistry</li> <li>Engineering</li> <li>Materials Science</li> <li>Environmental Science</li> <li>Mathematics</li> </ul> <div style="color: red; display: block;"> <h4 style="text-align: center;"><strong>Submission Fee</strong></h4> <h4 style="text-align: center;"><em>There is currently no established protocol for authors to pay for the publication at each stage of the quality evaluation and publishing process.</em></h4> </div> https://ph01.tci-thaijo.org/index.php/rmutijo/article/view/254602 The Strength of Cement Mortar with Industrial Rubberwood Fly Ash 2024-02-21T10:18:50+07:00 Thaweesak Thongkhwan thaweesak.t@rmutsv.ac.th CHUTHAMAT LAKSANAKIT chuthamat.l@rmutsv.ac.th Nuntachai Chusilp nuntachai.c@rmutsv.ac.th Wisitsak Tabyang wisitsak.t@rmutsv.ac.th Arun Lukjan arun.l@rmusv.ac.th Pongsak Sookmanee pongsak.s@rmusv.ac.th Arsit Iyaruk arsit.i@rmutsv.ac.th Tavorn Kuasakul tavorn.k@rmutsv.ac.th Premmanat Chumprom premmanat.c@rmutsv.ac.th <p> <span class="fontstyle0">The objective of this research is to study the strength of cement mortars mixed with industrial rubberwood fly ash. The rubberwood fly ash was used as a replacement for general-purpose hydraulic cement (GU) and Portland cement type 1 (PC) in proportions of 0, 10, 20, and 30 percent by weight of the binder. The water-to-cement ratio was varied to achieve a flow consistency of 110±5. Compressive strength, flexural strength, and tensile strength were then tested. The results of the study indicated that (1) the compressive strength of mortars decreased with the increase of rubberwood fly ash content. However, GU mortar met with a percentage of replacement of 20 percent. For PC mortar, while, the appropriate replacement of 10 percent. (2) the mortars with 10 percent rubberwood fly ash showed higher compressive strength than the control mortars. And, (3) the tensile strength of mortars decreased with the increase of rubberwood fly ash content. In conclusion, the appropriate replacement level for cement with rubberwood fly ash was 10 percent which provided opportunities for future extensions and developments.</span> </p> 2024-04-30T00:00:00+07:00 Copyright (c) 2024 Research on Modern science and Utilizing Technological Innovation Journal (RMUTI Journal) https://ph01.tci-thaijo.org/index.php/rmutijo/article/view/254604 The Feasibility of Using Rubberwood Bottom Ash in The Mixture of Interlocking Block 2024-01-11T16:22:51+07:00 Premmanat Chumprom premmanat.c@rmutsv.ac.th Charoon Charoennatkul charoon.c@rmutsv.ac.th Pornarai Boonrasi pornarai.b@rmutsv.ac.th Chuthamat Laksanakit chuthamat.l@rmutsv.ac.th Sommart Swasdi sommart.s@rmutsv.ac.th Pongsak Sookmanee pongsak.s@rmutsv.ac.th Taweesak Thongkun thaweesak.t@rmutsv.ac.th <p><span class="fontstyle0">The objective of this research is to evaluate the feasibility of using rubberwood bottom ash in the mixture of interlocking blocks. The mixtures were conducted including cement-to-aggregate ratios of 1:4, 1:5, and 1:6 by weight. The rubberwood bottom ash was used as the aggregate as same as laterite soil with different percentages of 0, 10, 30, and 50 by weight of aggregates. The mixtures were compacted using a manual interlocking molding machine. When comparing the research data with the community product standard 602/2547, which specifies that the ompressive strength of non-load-bearing blocks must be no fewer than 25 kg/cm</span><sup><span class="fontstyle0">2</span></sup><span class="fontstyle0">, and load-bearing blocks should have a compressive strength of no fewer than 70 kg/cm</span><sup><span class="fontstyle0">2</span></sup><span class="fontstyle0">, and the water absorption should not exceed 288 kg/m</span><sup><span class="fontstyle0">3</span></sup><span class="fontstyle0">, it is found that all mixtures met the stand for no-load-bearing blocks. While there were three mixtures met the standard for load-bearing blocks consisting of a ratio of cement to aggregate of 1:4 with 0, 10, 30, and 50 percent of rubberwood bottom ash, a ratio of cement to aggregate of 1:5 with 0 and 10 percent of rubberwood bottom ash, and a ratio of cement to aggregate of 1:6 with 0 percent of rubberwood bottom ash.</span> </p> 2024-04-30T00:00:00+07:00 Copyright (c) 2024 Research on Modern science and Utilizing Technological Innovation Journal (RMUTI Journal) https://ph01.tci-thaijo.org/index.php/rmutijo/article/view/255498 Development of Screen Inks from Black Soil and Red Soil using Natural Mordant 2024-03-05T10:46:34+07:00 Pawinee Theamdee ampchem_169@hotmail.com Thanita Wongsa-ard pawinee.t@lawasri.tru.ac.th <p><span class="fontstyle0">This research aims to develop printing ink and optimal conditions for screen printing on cotton fabric using natural colorants from black and red soil. The colorant powder, comprising 10 g, was blended with a prepared printing powder of 40 g at room temperature. Screen printing was conducted on cotton fabric, examining the impact of color-baking durations at intervals of 0, 5, 10, and 15 min at a temperature of 150 </span><sup><span class="fontstyle0">o</span></sup><span class="fontstyle0">C. Additionally, the effects of two different mordants such as Marl and sodium chloride at a 10% w/v concentration, were investigated concerning color fastness during washing, exposure to bleaching agents, sunlight, and abrasion resistance. The results of testing indicated that the cotton fabrics screen-printed with black and red soil colors with baked for 15 min exhibited the best colorants. When Marl was used as a mordant, the colors appeared richer, while sodium chloride produced brighter hues. The mordant from Marl exhibited superior color fastness for cotton fabrics screen printing with black and red soil colors. Furthermore, these colors with excellent durability could be screen-printed on various cotton fabric products.</span></p> 2024-04-30T00:00:00+07:00 Copyright (c) 2024 Research on Modern science and Utilizing Technological Innovation Journal (RMUTI Journal) https://ph01.tci-thaijo.org/index.php/rmutijo/article/view/255268 Development of Mouthwash from Guava Leaf Extract and Maweng Kruea Fruit Extract 2024-03-25T09:31:20+07:00 Thanyaphat Manud thanyaphat.ma@ssru.ac.th Charinthorn Fakkham Thanyaphat.ma@ssru.ac.th Anongnooch Thumpad Thanyaphat.ma@ssru.ac.th Kanokkorn Phio-on Thanyaphat.ma@ssru.ac.th <p><span class="fontstyle0">This study aims to test the antibacterial efficacy and antioxidant activity of leaf extract and Maweng Kruea fruit extract and develop a mouthwash product containing extracts from guava leaf and Maweng Kruea. The experiments were conducted by extracting both herbs with 95 % ethanol. Research results indicated that herbal extracts possess inhibitory effects against </span><span class="fontstyle2">Streptococcus mutans</span><span class="fontstyle0">. The minimum inhibitory concentration (MIC) that can inhibit microbial growth was found at 0.25 mg/mL, while the minimum bactericidal concentration (MBC) for killing bacteria was found at 0.25 mg/mL, with an MBC/MIC ratio of 1. The mouthwash composed of guava leaf and Maweng kruea fruit extracts exhibited antioxidant properties with an IC</span><sub><span class="fontstyle0">50 </span></sub><span class="fontstyle0">of 16.06 μL/ml. The developed mouthwash from these herbal extracts was found to have physical properties suitable for oral use, including a clear yellow color, slightly bitter and slightly sweet taste, minty aroma, slight cooling sensation, no tongue irritation, and a pH value of 6.7, making it suitable for oral conditions.</span> </p> 2024-04-30T00:00:00+07:00 Copyright (c) 2024 Research on Modern science and Utilizing Technological Innovation Journal (RMUTI Journal) https://ph01.tci-thaijo.org/index.php/rmutijo/article/view/255072 Effects of Chemical Fertilizer and Bio-Extracts on the Growth and Yield of Butterhead Lettuce in Substrate Culture System 2024-04-11T10:10:24+07:00 Kanjana Luangsuwalai chutee_AE@hotmail.com Sahassawat Boonpatompol chutee_AE@hotmail.com Chutima Kapkaeo chutee_ae@hotmail.com <p><span class="fontstyle0">Butterhead is a type of lettuce that is commonly consumed fresh. Currently, it is popular to grow fresh vegetables using a hydroponic solution system. The objective of this study was to examine the effect of using animal manure extract solutions on the growth of butterhead lettuce, grown in plastic pots using a soil substitute of sand mixed with rice husk charcoal. A randomized trial was conducted, consisting of six treatments: (1) chemical fertilizer (16-16-16), (2) vermicompost extract, (3) swine manure extract, (4) chemical fertilizer alternating with vermicompost extract, (5) chemical fertilizer alternating with swine manure extract, and (6) vermicompost extract alternating with swine manure extract. The results indicated that there are highly significant differences (</span><span class="fontstyle2">P&lt;0.01</span><span class="fontstyle0">) in the growth (growth in terms of bush width, height, number of leaves, leaf length, and leaf width) and chlorophyll content within treatments. The results of the experiment can be divided into three groups: (1) butterhead lettuce supplied with chemical fertilizer, (2) butterhead lettuce grown with a chemical fertilizer solution alternating with animal manure extract, and (3) butterhead lettuce provided with animal manure extract. A significant difference (</span><span class="fontstyle2">P&lt;0.01</span><span class="fontstyle0">) was found between the yield of each fertilizer, with the first group producing the most fresh weight of yield when compared to the other groups. The next highest producing yields were from chemical fertilizers alternating with swine manure extract solution, and chemical fertilizers alternating with vermicompost extract solution, respectively</span> </p> 2024-04-30T00:00:00+07:00 Copyright (c) 2024 Research on Modern science and Utilizing Technological Innovation Journal (RMUTI Journal) https://ph01.tci-thaijo.org/index.php/rmutijo/article/view/255294 Study of Mechanical and Morphological Properties of Polypropylene Blended with EPDM Rubber Powder from Automotive Door Seals 2024-04-18T15:32:03+07:00 Sirinthorn Thongsang sirinthorn.tho@mail.kmutt.ac.th Nattarat Kengkla nattarat.ken@kmutt.ac.th Nuntinee Boonjan nuntinee.zee@mail.kmutt.ac.th Kamonthip Tiraditsakul kamonthip.19@mail.kmutt.ac.th <p>This research studied the mechanical and morphological properties of polypropylene blended with Ethylene Propylene Dine Monomer (EPDM) rubber powder from automotive door seals. EPDM rubber powder was prepared as non-devulcanized and devulcanized by a thermo-mechanical method. The devulcanization of EPDM rubber powder in the crushing stage on a two-roll mill was studied at 220 °C and 230 °C, and a roller speed of 40 rpm for 25 minutes, and then further mashed in an internal mixer at 200 °C, and a rotor speed of 140 rpm for 10 minutes. Then, the devulcanization ability of the rubber was determined using the Soxhlet Extraction method to select the appropriate temperature. Both types of EPDM powder were mixed in polypropylene (PP) in the ratio of 0/100, 10/90, 20/80, 30/70, and 40/60 %wt. using an internal mixer and molded into a sheet by a hot press. It was found that the rubber devulcanization in the crushing stage on a two-roll mill with a temperature of 230 °C had a higher sol content than that of 220 °C, indicating a better ability to devulcanize. The tensile modulus of PP blends decreased with increasing both types of EPDM rubber powder, while the elongation at break and impact strength increased. The tensile strength tended to decrease when increasing with non-devulcanized and devulcanized EPDM at 30 and 40 %wt., respectively. The addition of devulcanized EPDM into PP gave rather better mechanical properties than that of non-devulcanized EPDM. The reason was that the devulcanized EPDM was a smaller powder and had a good dispersion, resulting in more surface area for adhesion with the PP matrix. In addition, the devulcanized EPDM that was scissored crosslinks became the free molecular chains, leading to a greater compatibility with PP.</p> 2024-04-30T00:00:00+07:00 Copyright (c) 2024 Research on Modern science and Utilizing Technological Innovation Journal (RMUTI Journal) https://ph01.tci-thaijo.org/index.php/rmutijo/article/view/256100 The Factors in Rail Transportation Service Considering User Expectation Toward New Normal and Sustainability: Case study Northeastern lines 2024-04-24T16:37:49+07:00 Narucha Tanaiutchawoot narucha@sut.ac.th Rattanaporn Kasamsri Kasemsri@sut.ac.th Kestsirin Theerathitichaipa d6500573@g.sut.ac.th Manlika Seefong d6500580@g.sut.ac.th Anon Chantaratang anon.ca@rmuti.ac.th Wilasinee Keerakittisakul wilasinee.pa@rmuti.ac.th Nattiya Wonglakorn nattiya.wo@rmuti.ac.th <p>The development of infrastructure and Thailand's transportation is a sustainable development country goal which consists of transportation management development such as transportation management system and service form, Infrastructure such as roads, transport stations, and railway routes. Railway transportation is a main issue in the success of transportation services. And all over the lifestyle has changed. Therefore, this research aims to study the services quality factors of Northeastern lines. The research instrument was a questionnaire. The researcher collected data from a sample group for 600 people and used second-order factor analysis. The result showed that the service quality is measured by vehicle characteristics, services, information, crews and terminal at a statistically significant level 0.01. Therefore, service providers should prepare the information of travel on vehicle and stations, provide the security guard in station, manage getting on and off trains at platform and clean the station regularly.</p> 2024-04-30T00:00:00+07:00 Copyright (c) 2024 Research on Modern science and Utilizing Technological Innovation Journal (RMUTI Journal) https://ph01.tci-thaijo.org/index.php/rmutijo/article/view/256061 The Solutions of Diophantine Equation \frac{1^4}{v_1^4}+\frac{2^4}{v_2^4}+\frac{3^4}{v_3^4}+...+\frac{k^4}{v_k^4}=1 2024-04-26T09:21:53+07:00 Patchara Muangkarn putchara31@gmail.com Jakkraphan Janthasopha math.sci@kpru.ac.th Cholatis Suanoom cholatis.suanoom@gmail.com <p>In this paper, we introduce solutions of the Diophantine equation on the following from: <img title="\frac{1^4}{v_1}+\frac{2^4}{v_2}+\frac{3^4}{v_3}+...+\frac{k^4}{v_k}=1" src="https://latex.codecogs.com/gif.latex?\frac{1^4}{v_1}+\frac{2^4}{v_2}+\frac{3^4}{v_3}+...+\frac{k^4}{v_k}=1" /><br />where <img title="v_i" src="https://latex.codecogs.com/gif.latex?v_i" /> are positive integer such that <img title="2\leq v_1&lt; v_2&lt;v_3&lt; ...&lt;v_k" src="https://latex.codecogs.com/gif.latex?2\leq&amp;space;v_1&lt;&amp;space;v_2&lt;v_3&lt;&amp;space;...&lt;v_k" /> and <img title="k=v_1" src="https://latex.codecogs.com/gif.latex?k=v_1" />. The results show that there will be only 1 solution when <img title="v_1=2" src="https://latex.codecogs.com/gif.latex?v_1=2" />, there will be only 3 solutions when <img title="v_1=3" src="https://latex.codecogs.com/gif.latex?v_1=3" />, and there will be at least 4 partial solutions when <img title="v_1\geq 4" src="https://latex.codecogs.com/gif.latex?v_1\geq&amp;space;4" />.</p> 2024-04-30T00:00:00+07:00 Copyright (c) 2024 Research on Modern science and Utilizing Technological Innovation Journal (RMUTI Journal)