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All Journal Jurnal Pembelajaran Fisika Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit
Dewi Nurhidayati
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Arts Chemical Engineering, Chemistry & Bioengineering Education Engineering Industrial & Manufacturing Engineering Social Sciences

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PERBANDINGAN PENGGUNAAN LKS (PREDICT-OBSERVE-EXPLAIN) DENGAN LKS KONVENSIONAL TERHADAP HASIL BELAJAR Dewi Nurhidayati; Feriansyah Sesunan; Ismu Wahyudi
Jurnal Pembelajaran Fisika Vol 5, No 2 (2017): Jurnal Pembelajaran Fisika
Publisher : Jurnal Pembelajaran Fisika

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This research aims to determine differences in learning outcomes betweenusing POE student worksheet with conventional student worksheet in Static Fluid topic. This research uses a non-equivalent control group design. Data were tested with Grouping Learning Outcome Technique, N-gains Analysis, normality test, homogeneity test, and independent T-test. Based on the resultof hypothesis test,it has known that there are differences in learning outcomesbetween using the POE student worksheet and conventional student worksheeton cognitive and psychomotor. Cognitive and psychomotor learning outcomes by using POE student worksheets is higher than cognitive and psychomotor learning outcomes by using conventional student worksheet.The average value of N-gain is 0.83, whereas psychomotor learning outcomes percentage in the experiment class 33 students (100%) of students who reach psychomotorpassi.Penelitian ini bertujuan untuk mengetahui perbedaan hasil belajar antara menggunakan LKS POE dengan LKS konvensional pada materi Fluida Statis. Desain penelitian ini menggunakan bentuk non-equivalent control grup design. Data diuji dengan Teknik Pengelompokan Hasil Belajar, Analisis N-gain, Uji Normalitas, Homogenitas, dan Uji Inde-pendent T-test. Berdasarkan hasil uji hipotesis, diketahui bahwa terdapat perbedaan hasil belajar menggunakan LKS berbasis POE dengan LKS konvesional pada ranah kognitif dan psikomotor hasil belajar ini menggunakan LKS berbasis POE lebih tinggi dibandingkan LKS konvensional pada ranah kognitif didapat nilai rata-rata N-gain sebesar 0,839, sedangkan hasil belajar ranah psikomotor pada kelas ekperimen sebanyak 33 siswa (100%) siswa yang mencapai KKM psi-komotorik.Kata Kunci: Fluida Statis, Konvensional, LKS POE.
LABORATORY SCALE OF RAYON FIBER MANUFACTURING: MANUAL STIRRING AND STIRRING USING A MAGNETIC STIRRER Dewi Nurhidayati; Warmiati; Wijayanti
Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit Vol 23 No 1 (2024): Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit
Publisher : Politeknik ATK Yogyakarta

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Laboratory scale production of rayon fiber has been carried out using manual stirring and a magnetic stirrer. The aim of this research is to compare rayon fiers produced through manual stirring and magnetic stirrer stirring. Experiments on making rayon on a laboratory scale are carried out for educational purposes which often have obstacles due to the limited availability of mixing equipment, such as magnetic stirrer. The method used in making rayon in this research is through the formation of cuprammonium ions. The results show that there is no significant difference between rayon produced manual stirring and magnetic stirrer stirring. It means that the manual mixing can be applied in the learning process for making rayon due in order to get around the limitations of available mixing equipments.
MOISTURE CONTENT MEASUREMENT IN GELATIN: A COMPARISON OF GRAVIMETRIC METHODS USING MOISTURE ANALYZER AND OVEN Warmiati; Dewi Nurhidayati
Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit Vol 23 No 1 (2024): Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit
Publisher : Politeknik ATK Yogyakarta

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The measurement of water content in gelatin samples in the practical activities in the Instrumentation and Polymer Engineering Laboratory is conducted using the gravimetric method with the Moisture Analyzer Sartorius Type MA 45. Meanwhile, the method acknowledged and approved by AOAC International is the Oven method. This research aims to compare the measurement results of the Moisture Analyzer with the reference method, namely the Oven method referring to AOAC, to determine if there is a statistically significant difference in the results. The results of both methods are compared using a paired T-test, yielding a calculated T-value (Tstat) of 0.7519 and a tabulated T-value of 2.2622. These results indicate that Tstat ≤ the tabulated T-value at a 95% confidence level, thus accepting the null hypothesis (H0). This suggests that μa=μb, meaning that there is no significant difference between the two methods. The precision test results for both methods also meet the criteria, with %RSD ≤ 2% and %RSD ≤ 2/3 CV Horwitz.
ANALYSIS OF METAL CONTENTS IN WELL WATERAT THE ATK YOGYAKARTA POLYTECHNIC LABORATORY Warmiati; Wijayanti; Armila Zahra Tawarniate; Dewi Nurhidayati
Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit Vol 23 No 1 (2024): Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit
Publisher : Politeknik ATK Yogyakarta

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This sudy has been conducted to determine the metal content in water used for laboratory activities at Politeknik` ATK Yogyakarta. The water used for laboratory processes should ideally be free from metal content to avoid contamination and corrosion. The metal content analyzed in this research includes Cu, Pb, Cr, adn Fe. The analysis method used is spectrophotometry, specifically Atomic Absoprtion Spectrophotometry (AAS), using standard series. The samples to be analyzed are first destructed according to the method outlined in SNI 6989 – 84: 2019. The analysis results obtained are as follows: Cu content in water sample is 0.046 mg/L, Pb content is 3.031 mg/L, Cr metal is 0.023 mg/L, and Fe content is 6.372 mg/L.
Co-Authors Armila Zahra Tawarniate Feriansyah Sesunan Ismu Wahyudi Warmiati Wijayanti