The indoor thermal comfort is one of the key factors in designing an energy-efficient sustainable building. In the tropics, ensuring indoor thermal comfort using air conditioning systems is the primary cause of the high energy consumption of buildings. This thermal comfort is greatly affected by the characteristics of the building envelope material, including the roof. Zinc roofing sheet is the most common roofing material used in Indonesia because of its lightweight and easy installation. However, it is corrosive, and it has a high thermal conductivity that can lead to overheating in the room. In order to improve indoor thermal comfort, it is necessary to find alternative, environmentally friendly building roofing materials. The purpose of this experimental study is to analyze and evaluate the effect of the type of roofing material on rooms' temperature profile and indoor thermal comfort level. Temperature measurements are carried out for three consecutive days on three prototype buildings with the one-twenty scale with different roofing materials: zinc plate, bamboo, and sugar palm fiber called Ijuk. In each building, four temperature sensors connected to a temperature data logger are placed at the rooftop surface, attic zone, bedroom, and living room. The measurement results show that the type of roofing material has a significant impact on the indoor temperature profile and comfort level both day and night. Considering the thermal performance shown by the results of the study, Ijuk can be a rational choice as a roofing material for residential houses in tropical climates.
Metode pembelajaran pada semester genap tahun ajaran 2020/2021 di SMK Negeri 5 Padang dengan menggunakan metode pembelajaran blended learning. Penerapan metode tersebut ditemui kesulitan bagi siswa yang mana masih kurangnya motivasi, minimnya pengetahuan, respon dan perhatian siswa kurang baik terhadap pembelajaran blended learning.Blended Learning merupakan penggabungan antara model pembelajaran konvensional dan pembelajaran daring. Setelah berjalannya waktu penerapan blended learning siswa pun aktif dan bersemangat serta respon siswa baik terhadap proses pembelajaran. Penelitian ini bertujuan untuk mengetahui bagaimanakah persepsi siswa terhadap penerapan metode blended learning pada mata pelajaran Dasar Perancangan Teknik Mesin kelas X di SMK Negeri 5 Padang. Metode Penelitian yang digunakan adalah penelitian deskriptif kuantitatif. Teknik analisis data yang digunakan untuk mendeskripsikan data yaitu dengan teknik analisis deskriptif yang meliputi: median, mean, modus, standar deviasi, dan frekuensi relatif persentasi kemudian dilakukan uji persyaratan analisis dengan uji normalitas. Tempat penelitian dilakukan di SMK Negeri 5 Padang. Subjek penelitian ini adalah siswa kelas X TPM 1 dan X TPM 2. Perlakuan yang diberikan dengan menggunakan metode blended learning. Hasil dari frekuensi variabel persepsi siswa berada pada kategori tinggi sebanyak 44 siswa (76%), hasil tersebut didapatkan sebagian persepsi siswa kelas X terhadap penerapan metode blended learning dalam mata pelajaran Dasar Perancangan Teknik Mesin bisa dikatakan baik pembelajaran bagi siswa. Dari hasil 76% siswa tersebut diartikan bahwa Siswa cukup mempunyai respon dan perhatian yang baik terhadap proses pembelajaran blended learning.
The author observes that the use of belt grinding is still rare in the writer's own environment, both in the fields of education and small industries, because there are still many people who are fixated on ordinary grinders, and think that ordinary grinders are better in all work. The development of belt grinders has changed people's perspectives through the development that the authors have done, with increasing belt grinding functions through development which will certainly make belt grinders even more useful. This belt burrs are made and developed through pre-existing belt grinding shapes. The result of this development is a belt grinder which has a function more than the belt grinder which is already before. This belt burrs has three types of work functions, namely vertical, horizontal, and cutter, and also features speed control. With the development that the author does, of course, it will change people's perspectives because belt grinding has a function that is better than before and can better help the work of a grinding process.
The critical environmental issues of the Indonesian automotive market growth are the increase in air pollution. Vehicle exhaust emission can cause significant problems for the human health and the environment. Therefore, vehicle emission control is indispensable to mitigate the environmental problem. One of the most widely used methods to reduce automotive emission is utilization of catalytic converter in exhaust system. In fact, the catalyst performance in the reduction of noxious gases depends on its material and geometric design. This study aims to evaluate the effect of geometric parameter on the performance of motorcycle catalytic converters. In this experimental study, the catalytic converter made of brass foil plate is mounted on motorcycle muffler. The effectiveness of three catalyst geometry models namely flat perforated plate, folded perforated plate and rolled brass sheet, will be evaluated in relation to the reduction of hydrocarbon (HC) and carbon monoxide (CO) content. HC and CO emission levels are measured by four gas analyzers. The results show that the geometric parameter has a significant effect on HC and CO’s composition in the exhaust gas. For idle speed test, the second geometry model of catalyst presents the best performance in reduction of Hydrocarbon and CO2 concentration.
This paper explain about the effects of the collaborative-think pair share project based learning model on learning outcomes of student on the subjects of the auxiliary machine. In this study the twelve grade students of the Commerce Ship Engineering department, SMKN 10 Padang has been considered as research population. The research method is a quasi-experimental. The sample consist of two classes: the first one is an experimental group (EG, n = 21) with collaborative-think pair share group project based learning model. The other one is the control group (CG, n = 20) with conventional learning model. The results of the study show that the use of collaborative-think pair share project-based learning models can improve student’s learning outcomes significantly compared to the conventional one. The collaborative-think pair share project-based learning model is more effective than conventional one in improving students’ learning outcomes, especially on the vocational high school in Padang.
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