International Journal of Natural Science and Engineering

Analisis dan Redesign User Interface Website Ujian Sekolah SMK Nusa Dua Menggunakan Metode Design Sprint

2024-07-22T01:22:20+00:00

Website Ujian Online SMK Nusa Dua adalah website yang digunakan untuk melaksakan ujian sekolah seperti Penilaian Tengah Semester (PTS), Penilaian Akhir Semester, dan ujian lainnya. Website ini dikembangkan secara mandiri oleh SMK Nusa Dua. Semenjak pengembangan awal pada tahun 2015 sampai tahun 2024, website hanya mendapatkan perubahan minor. Pelajar sebagai pengguna yang paling berdampak langsung, yang dimana Website Ujian Online SMK Nusa Dua tidak mobile friendly. Berdasarkan pengalaman tersebut Website Ujian Online SMK Nusa Dua perlu melakukan perancangan ulang dibagian antarmuka. Metode yang digunakan dalam penelitian ini adalah Design Sprint, ada 6 tahapan yang harus dilakukan seperti: Understand, Define, Sketch, Decide, Prototype, Validate. Penelitian ini akan menghasilkan Prototype Website Ujian Online SMK Nusa Dua. Penelitian ini berbanding lurus dalam hasil pengujian menggunakan metode System Usability Scale (SUS) yang mendapatkan skor 81 yang termasuk kategori Acceptable.

Technical and Economical Analysis on The Design of Distillation Column in Biodiesel Industry

2022-02-20T11:54:04+00:00

The distillation column is one of the important pieces of equipment in the biodiesel industry for separating biodiesel compounds from other compounds such as glycerin and methanol residues. The purpose of this research is to predict the price of the Distillation Column in the future based on the specifications of the tool. This research was conducted by determining the required equipment specifications based on capacity and calculating the estimated price using the Peters & Timmerhauss formula then comparing the price with the current market price. The results of the calculation show that the greater the capacity, the greater the specifications of the Distillation Column required, such as the tower diameter, tower height, and a number of holes in the tray. As well as the larger the capacity of the distillation column, it also requires more complex supporting accessories for the distillation column so that it can operate optimally. Based on the calculation of the price of the Distillation Column, the results are in accordance with the current market prices. So that this calculation method is adequate to predict the price of the Distillation Column.

Determination of Total Flavonoid, Iron (Fe) and Chlorophyll Content of Brazilian Spinach Extract (Althernanthera sisso) based on Different Types of Extraction Solvents

2024-08-30T16:41:19+00:00

Brazilian spinach (Althernanthera sisso) is a vegetable species originating from Brazil and starting to be cultivated in Indonesia. Brazilian Spinach Extract contains secondary metabolite compounds, namely flavonoids, alkaloids, steroids and saponins. The iron and chlorophyll content in spinach plants is relatively high compared to other vegetables. Chlorophyll is used in the treatment of anemia and helps the body utilize iron. The aim of this research is to determine the best type of solvent that can extract the total flavonoid, iron (Fe) and chlorophyll compounds maximally from Brazilian spinach which has the potential to be developed as a food supplement ingredient. The type of research is Quasi experimental with a Completely Randomized Design. The sample is Brazilian Spinach extracted with 70% EtOH , EtAc, and MeOH. Determination of levels using UV-Vis Spectrophotometry and AAS. The results showed that the MeOH solvent had the highest extract yield value (10.87%), the highest Iron (Fe) content (10.205 mg/kg), Chlorophyll of 13,586.571 mg/kg, and Total Flavonoids of 900.128 mg/100g QE, therefore MeOH is the best solvent for extracting Brazilian Spinach (Althernanthera sisso).

Simulation and Optimization of Formic Acid Distillation using Aspen HYSIS

2024-05-25T15:15:11+00:00

Using Aspen HYSYS V10, this study looks into how to validate and improve the AT-660 distillation column at PT Chemical Happy, a plant that makes formic acid. Distillation is a crucial process in chemical engineering for separating liquid mixtures based on vapor pressures and boiling points. The primary challenge in formic acid production is the separation of azeotropic mixtures, particularly formic acid and water, from methanol and methyl formate. We utilize various packing materials, like pall rings, to enhance the efficiency of the distillation columns. The research involved simulating the plant process and comparing the results with actual plant data. The study found that the simulation results were consistent with the real-world data, validating the software's accuracy. The findings suggest that adjusting operational parameters can significantly improve the efficiency and purity of formic acid production. This research provides practical solutions for optimizing distillation processes and demonstrates the effectiveness of simulation software in industrial applications.

Dengan menggunakan Aspen HYSYS V10, penelitian ini mencari cara untuk memvalidasi dan meningkatkan kolom distilasi AT-660 di PT Chemical Happy, sebuah pabrik yang memproduksi asam format. Distilasi adalah proses penting dalam teknik kimia untuk memisahkan campuran cairan berdasarkan tekanan uap dan titik didih. Tantangan utama dalam produksi asam format adalah pemisahan campuran azeotropik, khususnya asam format dan air, dari metanol dan metil format. Kami menggunakan berbagai bahan pengemas, seperti cincin pall, untuk meningkatkan efisiensi kolom distilasi. Penelitian ini melibatkan simulasi proses pabrik dan membandingkan hasilnya dengan data pabrik yang sebenarnya. Penelitian ini menemukan bahwa hasil simulasi konsisten dengan data dunia nyata, memvalidasi keakuratan perangkat lunak. Temuan ini menunjukkan bahwa penyesuaian parameter operasional dapat secara signifikan meningkatkan efisiensi dan kemurnian produksi asam format. Penelitian ini memberikan solusi praktis untuk mengoptimalkan proses distilasi dan menunjukkan keefektifan perangkat lunak simulasi dalam aplikasi industri.

MICROLEARNING-BASED LEARNING VIDEO ON THE CONTENT OF GRADE IV ELEMENTARY SCHOOL SCIENCE LESSON

2024-10-08T09:16:07+00:00

This research problem focuses on the limited use of technology-based learning media in schools, which affects students' low understanding of IPAS material. This research aims to create a microlearning-based learning video that is valid, practical, and effective in increasing the motivation and learning outcomes of grade IV elementary school students. This type of research is development research (R&D) with ADDIE design. The research subjects involved 31 fourth grade students and 3 experts for validation. The data collection methods used were questionnaires and tests. While the instruments used were questionnaire sheets and multiple choice tests. The data analysis process in this study involved various techniques, including qualitative, quantitative, and inferential descriptive analysis. Qualitative analysis will come from the results of questionnaires, interviews, input and criticism by experts. Meanwhile, the quantitative analysis was obtained from the calculation of the validity, practicality, and effectiveness tests of the media. Finally, hypothesis formulation and conclusions were drawn through inferential descriptive analysis. The results showed that there was a significant difference between after and before being taught using microlearning-based video media on IPAS learning content. So it can be concluded that the media developed is valid, practical, and effective to use. The results of this study are expected to be used as a reference or reference if interested in researching the use of learning media, especially microlearning-based learning videos in schools and among the community.