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PENGARUH SISTEM BLOK PRAKTEK TERHADAP KOMPETENSI MAHASISWA JURUSAN TEKNOLOGI PENGOLAHAN KULIT POLITEKNIK ATK YOGYAKARTA Nurwantoro; Alfani Risman Nugroho
Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit Vol 17 No 1 (2018): Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit
Publisher : Politeknik ATK Yogyakarta

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Abstract

Teaching factory is a learning model in vocational education institutions that uses a product (goods/services) as a learning media to delivering competency and organized through collaboration between school and industry. The block system is one of the main elements of the Teaching Factory learning method. Through a block system, the process of learning theory and practice is carried out alternately in sufficient time to fulfill the desired competencies. This study aims to determine the effect of the application of the practice block schedule in the learning process to increase the effectiveness of learning at the Leather Processing Technology Department, Polytechnic of ATK Yogyakarta, and to determine the effect of the application of the practice block schedule on improving student competency in the Leather Processing Technology Department, Polytechnic of ATK Yogyakarta. In proving and analyzing this, multiple linear regression analysis was used with the f test and t test. The numbers of samples in this study were 40 students who had graduated. Data collection techniques were by giving questionnaires to students, interviews and documentation. Testing data analysis used validity, reliability, classic assumption tests and linear regression tests. The results of the analysis test can be interpreted that the variable schedule system block practice subjects do not affect general competency. This was because the value of -t count> -t table (-0.004> -2.024) or significance> 0.05 (0.997> 0.05) so that Ho was accepted. To improve the competency of students or graduates there were several variables that can influence other than the block schedule there was still an adequate curriculum and infrastructure. However, the practice block system was able to increase the effectiveness of learning in the Leather Processing Technology Department, Polytechnic of ATK Yogyakarta in accordance with the answers of respondents. Respondents stated that they are very appropriate (15-25%), appropriate (40-60%) and quite appropriate (5-25%).
STUDI DEPLESI KULIT KAMBING PADA DELIMING MENGGUNAKAN (NH4)2SO4 Prasetyo Hermawan; Alfani Risman Nugroho
Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit Vol 17 No 1 (2018): Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit
Publisher : Politeknik ATK Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (587.208 KB)

Abstract

The purpose of this research is to study depletion on goat skin in the deliming process. The experiment was conducted using (NH4)2SO4 (ammonium sulfate) as deliming agent and using a jar test tool. Tests performed on pelt and liquid characters during the deliming process; pelt weight, pelt thickness, pH and contain nitrogen and sulfide of deliming liquid. Variations made of use (NH4)2SO4 is; 0, ½, 1.0, 1½, 2 and 2½ gr for 50gr of pelt. The results showed that the use of 1 gr (NH4)2SO4 decreases the pH of the liquid deliming pelt Ca(OH)2 from 11.0 to 8.9. Changes in the weight and thickness of pelt Ca(OH)2 in the use of 1gr (NH4)2SO4 are; 11% and 53% respectively. The use of 1gr (NH4)2SO4 and will produce the fastest rate in weight and thickness of pelt Ca(OH)2, namely each; 0.008% weight / minute and 0.02% thick / minute. In addition to 1gr (NH4)2SO4, the deliming liquid of pelt Ca (OH)2 has a final pH of 8.9 and from pelt NaOH has a final pH of 9.12. Pelt Ca(OH)2 on the use of 1gr (NH4)2SO4 has 13% compression and pelt NaOH on the use of 1.5gr (NH4) 2SO4 has compression 8.8%. The greater use of (NH4)2SO4 will produce fluid deliming with character greater nitrogen and sufide levels, except the lower sulfide levels for pelt Ca (OH)2 sulfide.