This study focuses on the potential of biomass to be developed becomes charcoal briquette. Based on data from the Central Bureau of Statistics (North Sumatra Province), the planted area and total coconut production of North Sumatra Province in 2019 were 110,345 hectares and 99,132 tons. The objective of this research is to obtain the properties of charcoal briquettes by varying the composition and pressure. The variations of the briquette moulding pressure are 80 and 100 Bar with composition variations of 1:10 and 1:15, respectively. The experimental tests were carried out to obtain Young’s modulus and wt% of briquette. The results showed that the value of tensile strength and wt% of briquette depends on the moulding pressure and duration of drying. The conclusion of this study shows that coconut shell and durian skin waste are very likely to be used as a renewable alternative fuel energy source as briquette.
Penelitian ini bertujuan untuk menganalisis seberapa besar pengaruh media pembelajaran dan kecerdasan emosional terhadap hasil belajar siswa. Penelitian ini merupakan penelitian ex-post facto jenis correlational study dengan pendekatan kuantitatif. Teknik sampel menggunakan teknik Slovin dengan probabilitas random sampling. Teknik pengumpulan data menggunakan kuesioner dan dokumentasi. Validitas instrument menggunakan expert judgment dan uji coba lapangan. Reliabilitas menggunakan teknik cronbach’s alpha. Teknik analisis data menggunakan statistik inferensial. Hasil penelitian menunjukkan bahwa terdapat pengaruh yang positif dan signifikan antara (1) X1 terhadap Y dengan nilai R= 0,279 (rendah) dan R2= 0,078; (2) X2 terhadap Y dengan nilai R= 0,546 (sedang) dan R2= 0,299 dan; (3) X1 dan X2 terhadap Y dengan nilai R= 0,592 (sedang) dan R2= 0,351dengan persamaan regresi Y = 2,971 + 0,001X1 + 0,003X2. Pada penelitian ini media pembelajaran dan kecerdasan emosional memberikan sumbangan yang kecil. Namun, pembentukan keduanya penting untuk bekal siswa setelah lulus.
This study aims to analyze the effect of e-learning on VET learning, the factors that support the success of e-learning, and the role of e-learning in practical learning performance. This type of research was a quantitative study with a meta-analysis approach. A total of 18 articles on e-learning in VET learning were selected as samples. The 18 articles were taken from the journal of Sinta accredited (the national index in Indonesia). The data is analyzed by determining the effect size value. The main finding of this study indicates that e-learning has a significant influence on VET learning. This result is obtained by measuring the average effect size value of 18 articles which is 0.344 0.25, categorized as a significant effect category. Another interesting finding is that the effect of e-learning in VET learning is only on the learning outcomes of particular theoretical and performance learning, increased motivation, and increased interest. For performance learning, not all can be accommodated by e-learning, only practical learning using computer and internet media such as digital simulation learning and WEB programming. Whereas in conventional performance/practical learning, e-learning cannot be used as the primary form of learning. The limitation of this study is the low number of studies on the use of e-learning in VET learning. As a result, this study provides a less broad representation. A meta-analysis on the effect of e-learning on VET learning is undoubtedly an exciting study. The reason is that almost all forms of VET learning are performance learning (practical learning). Therefore, e-learning in VET practical learning is a new study that can be developed.
This research utilizes corncob waste for making bioethanol by RON 109. The objective of this research is to get the best performace of exhaust emission by mixing gasoline RON 90 from E5, E10, E15, E20, to E25, and 10:1, 11:1 and 12:1 of compression ratio. In addition, the control variable covered 1400 rpm, 2400 rpm, and 3400 rpm engine speed. The testing data of exhaust emission was taken only on the carbon monoxide (CO) and hydrocarbon (HC). The result on this biethanol from corncob waste showed that the lowest exhaust emission on carbon monoxide and hydrocarbon and recom mended to be used was found on E10 fuels at 10:1 compression ratio, and E20 fuels at 11:1 compression ratio. The result obtained from this research demonstrated that the carbon monoxide and hydrocarbon emissions that produced by corncob waste bioethanol were environmently friendly compared to gasoline use only (E0).
This experiment has developed and tested a plastic fiber optic-based temperature and humidity sensor (FOTHS). In the FOTHS test, the leading equipment is needed, such as a single model plastic optical fiber, a test chamber, a time-domain reflectometer (OTDR), a computer for data acquisition, and silicone oil used as a substitute for the 3 cm long optical fiber cladding layer. Silicone oil is used as a sensor material because it has a high sensitivity to changes in temperature and humidity. Optical fiber testing is carried out in a light-tight test chamber by changing the temperature and humidity. Changes in light intensity with changes in temperature and humidity are measured by OTDR, with information in voltage changes. At a constant temperature and variable humidity, information was obtained that the light intensity increased linearly at 45 °C with an increase in voltage of 0.0057 volt/1% RH. At constant humidity and variable temperature, information was obtained that the light intensity will decrease linearly at 20% RH with a voltage drop of 0.0171 volt/1 °C. Changes in voltage to variations in temperature and moisture make plastic optical fiber a temperature and humidity sensor.
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