Optimization of Operating Conditions for CO2 Methanation Process Using Design of Experiments

In this study, the Taguchi experimental design method using an L16 orthogonal array was attempted in order to investigate the optimal operating conditions for the CO2 methanation process in Ni-based catalysts. The relative influence of the main factors affecting CO2 conversion and CH4 yield was ranked as follows: reactor pressure > space velocity > reaction temperature. The optimal combination of operating conditions was a reactor temperature of 315 °C, a pressure of 19 bar, and a space velocity of 6000 h−1. The effect of the H2/CO2 ratio on CO2 conversion and CH4 yield was further considered under these optimal operating conditions. Moreover, the catalyst was characterized in order to investigate the production of coke through Brunauer–Emmett–Teller analysis, thermogravimetric analysis, and scanning electron microscopy. The amount of coke produced after the reaction for approximately 24 h was ~2 wt.%. Therefore, the desired CH4 yield and long-term operational stability were successfully obtained using the Taguchi design method and catalyst characterization.

Enhanced Optimization of Bioethanol Production from Palm Waste Using the Taguchi Method

In the present study, palm fiber (PF) and palm fronds (PFN) were selected as local agricultural wastes for the extraction of different biopolymers (cellulose, hemicelluloses, and lignin) by alkaline sodium hydroxide (PF, 2.37% NaOH at 86.5 °C for 1.6 h; PFN, 6% NaOH at 90 °C for 1 h) and bioethanol production. The processes of extraction were optimized by the experimental design method of Taguchi. The total carbohydrates of PF and PFN obtained were 24.4% and 31.0%, respectively. In addition, the untreated palm fiber (UPF), untreated palm frond (UPFN), cellulose palm fibers (CPF), and cellulose palm fronds (CPFN) were subjected to enzymatic hydrolysis processes using crude enzymes and commercial enzymes at 48 °C and pH 5.5. The results indicate that the maximum reducing sugars used were CPF 229.90, CPFN 243.69, UPF 120.19, and UPFN 100.00 (mg/g), which were obtained at a crude enzyme loading. CPF and CPFN hydrolysates were then successfully converted into bioethanol by a separate enzymatic hydrolysis and fermentation by Saccharomyces cerevisiae. Anaerobic cultivation of the hydrolysates with S.cerevisiae resulted in 0.222 g/g and 0.213 g/g bioethanol in the case of CPF and CPFN, respectively. Optimization processes could be an innovative approach to the sustainable development of bioethanol production.

Meningkatkan Keterampilan Siswa Dalam Materi Chest Pass Bola Basket Melalui Wa-G Dan Zoom Video

This research is motivated by a factual basis about Improving Student Skills in Basketball Chest Pass Materials Through WA-G and Zoom Video. To find out whether there is an increase in basketball chest pass skills through (WA-G), whether there is an increase in basketball chest pass skills through video zoom, and which is more effective between using (WA-G) and using video zoom to improve chest pass skills. basketball The researcher used a quantitative approach with a quasi-experimental design method. The population of this study were all students of class VIII SMP Negeri 5 Tanjung with a total of 90 students. The sampling technique in this study used a purposive sampling technique with 30 class VIII students at SMP Negeri 5 Tanjung. To find out whether the test results are valid or not, it must be done through Pre-test and Post-test tests and data analysis techniques in this study using normality, homogeneity, and hypothesis testing techniques. The results showed that there was an increase between before and after being given treatment through WA-G towards an increase in the level of basic chest pass technique skills of class VIII students of SMP N 5 Tanjung with a mean value or average pretest of 78.58 to posttest of 82.48 and a score of 82.48. sum or the number of pretest is 2436 to posttest is 2557, there is an increase between before and after being given treatment via zoom video to increase the level of basic chest pass technique skills of students of class VIII SMP N 5 Tanjung with a mean or average value, pretest of 78.23 to posttest of 81.35 and the sum value or the number of pretests of 2425 to posttest of 2522, and the increase in the WA-G group was greater than the video zoom group.

The effect of virtual community for physical activity on student's physical activity in the era of pandemi Covid-19

The purpose of this study was to increase the physical activity of students in the era of the COVID-19 pandemic, to maintain and improve body fitness. A quantitative approach using the experimental design method then with a one - group pretest - posttest design research design. Then the population in this study were UPI students in semesters 2-3, who had low physical activity. with a sample of 12 female students. This research was conducted during the first month of the first week for the pre-test, then the 2nd and 3rd weeks for treatment and ended with the post test for the 4th week, the data was collected using the accelerometer actgraph instrument and the Global Physical Activity Questionnaire (GPAQ). The results of the mets value for the pretest 1.153 to 1.27 for the post-test score, for the average total stepcount value for the pretest 2. 619 to 3340, while the mets value for the pretest GPAQ was 432.67 and then for the posttest value 529.58. The conclusion is that there is a significant influence from the virtual community for physical activity on the physical activity of students during the Covid-19 pandemic.Pengaruh virtual community for physical activity terhadap aktivitas fisik mahasiswa di era pandemi Covid-19AbstrakPenelitian ini adalah untuk meningkatkan aktivitas fisik mahasiswa di era pandemi covid -19, untuk menjaga dan meningkatkan kebugaran tubuh. Pendekatan penelitian adalah penelitian kuantitatif dengan metode eksperimen desain one - group pretest - posttest design. Sampel pada penelitian ini adalah mahasiswi UPI semester 2 sampai dengan 3 yang mempunyai aktivitas fisik rendah. Penelitian ini dilaksanakan selama satu bulan, minggu pertama untuk pre-test, lalu minggu ke 2 dan 3 untuk perlakuan dan diakhiri dengan post-test untuk pada minggu ke-4. Instrumen pengambilan data yang digunakan diantaranya accelerometer actigraph dan Global Physical Activity Questionnaire (GPAQ). Hasil dari nilai mets untuk pretest 1,153 menjadi dan meningkat menjadi 1,27 pada akhir perlakuan. Nilai stepcount total rata rata pretest 2619 meningkat menjadi 3340, dan nilai mets pada GPAQ pretest 432.67 meningkat menjadi 529.58. Kesimpulan penelitian ini bahwa terdapat pengaruh yang signifikan dari virtual community for phisical activity terhadap aktivitas fisik mahasiswa pada era pandemi Covid-19

Pengaruh Latihan 3 Cone Wall Passing dan “V” Roll To Gated Pass Terhadap Akurasi Passing Bawah

Football is also one of the sports in West Nusa Tenggara Province which is very popular among the people. The highest achievement ever inscribed by the West Nusa Tenggara Football sport was participating in the Riau National Sports Week (PON) in 2012. The purpose of the study was to determine the effect of 3 Cone Wall Passing and "V" Roll To Gated Pass Exercises on Bottom Passing Accuracy. SSB Neo Selaparang KU 12 Players in 2021. This research uses the Experimental Design method with a one-group pretest-posttest design model. The population in this study was matched with the A-B-B-A pattern in two groups with 10 athletes each consisting of 20 players. The sampling technique used is ordinal pairing. The instrument in this study was a test of basic soccer skills. The data analysis of this research used t-test. The results showed that: the 3 cone wall passing exercise group obtained t count 6,167, the "V" roll to gated pass exercise group t calculated 4,311 and t table (df 11) 2,201 "The conclusion of this study is that there is a significant effect of 3 cone wall exercises passing on the passing accuracy of the 12-year-old SSB Neo Selaparang KU player and There is a significant effect of the “V” roll to gated pass exercise on the accuracy of the underhand passing of the 12-year-old SSB Neo Selaparang KU player

PERBANDINGAN PERMAINAN EDUKATIF DAN ANIMASI VIRTUAL TERHADAP HASIL BELAJAR MATEMATIKA DITINJAU DARI KEAKTIFAN SISWA

This research aims to compare educational games and virtual animations to mathematics learning outcomes in terms of student activity. The research was conducted in the fourth grade of SDN Jatirangga I Bekasi. The sampling technique used cluster sampling technique. The method used is a quasi-experimental design method. Furthermore, the normality and homogeneity prerequisite tests were carried out to show the normal and homogeneous data groups. After that, hypothesis testing using two-way ANNAVA obtained interaction t count (I) = 4.03 at the significance level of 0.05 t table = 3.96 because tcount> ttable then Ho was rejected. Thus, it means is an interaction between learning media and student activity towards mathematics learning outcomes. Because there is an interaction, Tukey's further test is carried out which gets the first result, namely Qcount = 4.85 while at α 0.05 dbv1 = 4 and dbv2 = 20 indicates Q table = 3.96. because Qcount> Qtable then Ho is rejected, it can be concluded that there are differences in mathematics learning outcomes using educational games and virtual animation on the low category of student activity. The second Tukey test shows the results, namely Qcount = 0.84 and Qtable = 3.96. It is concluded that by 0.84 <3.96 or Qcount <Qtable then Ho is accepted, it can be concluded that there is no difference in learning outcomes of mathematics using educational games and virtual animation on high category student activity.

THE EFFECT OF PHONOLOGICAL INSTRUCTION FOR STRUGGLING READERS IN ELEMENTARY

This study aims to determine the impact of phonological instruction interventions on dyslexic students in elementary schools. We tested the effect of phonological instruction on phonological awareness, reading and spelling skills in 4 subjects who had almost similar reading difficulties at different grade levels. This study used an experimental design method single subject research (SSR). The SSR design used is the A-B-A design which consists of three stages of conditions, namely: A-1 (baseline 1), B (intervention), A-2 (baseline 2). Tests given to measure baseline and intervention results of phonology awareness tests, reading tests and spelling tests. Measurement of ability at the baseline was given as many as 4 sessions while the intervention for 12 sessions. The results showed that phonological instruction had an effect on increasing phonological awareness, reading and spelling skills. The significant effect of phonological instruction interventions suggests that understanding phonological principles is beneficial for students with dyslexia.

Dynamic Analysis and Looseness Evaluation of Bolted Connection Under Vibration of Machine Tools

Bolted connections are widely used in the machine tool manufacturing and equipment. As it is well known, bolt preload will be attenuated by the vibration of machine tools, which will degenerate the working life of machine tools. In this paper, a new experimental design method is introduced into the study on bolt preload attenuation: the quadratic general rotary unitized design. The dynamic analysis of the bolted connection is carried out based on a finely fragmented numerical model to interpret the generation of fretting slip and the reason for the loosening of bolts. The alternating load cyclic vibration test, implemented on the bolted joints, can provide the vibration response under the influence of different working factors. Statistical test and analysis are performed on the quadratic regression mathematical model of the bolt preload attenuation, and the principal working factor that affecting the bolt preload attenuation under vibration can be obtained. Based on the analytical result, the combination of the working factors at the lowest bolt preload attenuation rate, which can effectively slow the bolt looseness, is investigated. The results of this study can provide an experimental basis for improving the machining stiffness of machine tools.