Found 6 Documents

Tinjauan Sistem Akuntansi Piutang dan Penerimaan Kas pada Koperasi Karyawan PT. Goodyear Tbk Sutarti, Sutarti; Rosita, Siti Ita; Aisyah, Iis Siti
Jurnal Ilmiah Ranggagading (JIR) Vol 6, No 2 (2006): Jurnal Ilmiah Ranggagading
Publisher : Sekolah Tinggi Ilmu Ekonomi Kesatuan

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Credit management at co-operative needs good accounting system and procedure to minimize risk of credit from any abuse, no-returned credit, and other risks as it has been carried out at enterprises in the form of Limited Company, CV, et cetera. The credit at Goodyear Worker’s Co-operative are acquired from material selling by credit service and being in debt by co-operative members. The finding of this study showed that credit accounting system and cash acquisition at Goodyear Workers’ Co-operative was good enough because of support by organizational structure and internal control that made separation of obvious functional responsibilities of each department and other component of control. Keywords : Credit accounting system
The effect of Chamfer to the Tensile Strength of Steel Jis S45cr Friction Welding Joints Aisyah, Iis Siti
Journal of Energy, Mechanical, Material and Manufacturing Engineering Vol 1, No 1 (2016)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (483.76 KB) | DOI: 10.22219/jemmme.v1i1.4477


Friction welding is a joining process that utilizes the force of pressure and heat from the friction to melt the tip of the workpiece in order to be connected The research has been conducted to measure the influence of the length of one side chamfer to the characteristic of the tensile strength of steel JIS45Cr friction welding joints.The research was conducted by experimental method with rotation speed 1800 rpm, time kept at 50 seconds, load used was 3.5 kg, chamfer angle was 30º and the length chamfer were 3 mm, 5 mm, 7 mm, 9 mm and 11 mm. The tensile test conducted to find the effect of the chamfer length.The result of the research concluded that the highest tensile test on length variant of 7 mm, it was 97.3505 kN/mm2 and the lowest on 3 mm was 92.9868 kN/mm2. It is proved that the chamfer length effect to thee tensile strength of friction welding.
Trends in Lightweight Automotive Materials for Improving Fuel Efficiency and Reducing Carbon Emissions Refiadi, Gunawan; Aisyah, Iis Siti; Siregar, Januar Parlaungan
Automotive Experiences Vol 2 No 3 (2019)
Publisher : Automotive Laboratory of Universitas Muhammadiyah Magelang in collaboration with Association of Indonesian Vocational Educators (AIVE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1553.723 KB) | DOI: 10.31603/ae.v2i3.2984


Depletion of fossil fuels and greenhouse gases is an essential issue in the development of the automotive industry. From the design stage, material selection becomes the most crucial factor. Therefore, this article discusses the development of lightweight automotive materials for increasing fuel efficiency and reducing carbon emissions. Material reliability is assessed by how much weight reduction can be achieved, production costs, safety and durability. Ferro materials (mild steel, High Strength Steel, and Advanced High Strength Steel), non-ferrous (aluminium and magnesium alloy), and Fiber Reinforced Plastics (FRP) have been proven to reduce the total weight of vehicles up to 12.6%. Confirmation of statistical data from the literature illustrates the possibility of using lightweight material to achieve zero CO2 emission. In addition, the 12.6% weight reduction still meets the vehicle safety factor.
The Professional and Pedagogic Competences of English Teachers With Different UKG (Teaching Competence Test) Achievement Levels Aisyah, Iis Siti; Yuliasri, Issy; Warsono, Warsono
English Education Journal Vol 9 No 1 (2019): March 2019
Publisher : English Education Journal

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/eej.v9i1.27643


Professional and pedagogic competences are the basic aspects for effective teaching and learning to take place in classrooms. They are dealing with the quality of teaching-learning process. However, the average score of UKG (Teacher Competence Test) in Indonesia did not achieve standard expected target. This mixed-methods study is aimed to reveal professional and pedagogic competences of English teachers with different UKG  achievement levels. Quantitative method was employed in the first phase through student questionnaire to investigate students’ perception on their English teachers’ professional and pedagogic competences performed in classrooms. 14 classes students of six junior high schools in Bandung, West Java, were chosen as participants.The total number of students was 474 with 14 English teachers as subjects of the study. In the second phase, this study employed a descriptive qualitative method through classrooms observation and documentation to reveal how English teachers with different UKG chievement levels performed their competence in classrooms. Five teachers out of the 14 teachers under study were chosen as participants.The finding reveals that  based on students’ perception, professional and pedagogic competences demonstrated by English teachers in classrooms do not fully reflect their UKG achievement levels. In some aspects, the teachers with lower UKG achievement are not perceived worse than those with higher UKG achievement. This finding is in line with the finding based on classrooms teaching performance of  the five English teachers’ under study. In some parts of lessons, the lower achievers could even perform better than the highers.
Mechanical and Corrosive Nature of Galvanized Steel in Sodium Chloride Solution Chowdhury, Azrin Akhter; Aisyah, Iis Siti
Journal of Energy, Mechanical, Material and Manufacturing Engineering Vol 3, No 2 (2018)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (494.411 KB) | DOI: 10.22219/jemmme.v3i2.6846


Galvanizing also denoted as zinc coating is a scientifically approved method applied to protect iron and steel against the effects of corrosion. In the galvanization process, aluminum is added with zinc. Zinc has numerous properties under different environmental conditions. These properties are subject to change when it comes to the coating process. The common properties here may include its appearance, hardness, the thickness along with other mechanical and physical properties. Due to these properties, there may also be inconsistency on the coating structure. So the addition of aluminum unto zinc, will ensure that various properties are eliminated for the better improvement of the zinc coating process. Aluminum possesses stronger mechanical properties and therefore valid for the coating process. It ensures that zinc is not arrived at by the corrosion agents. In this study, the focus will largely be based on the impact of aluminum on corrosion behavior as aligned to hot-dip galvanized steel. However, in this study, the galvanization process was performed using the dry process. The percentage variation of zinc resulted in different results in the rate of corrosion. The hardness of zinc thus increased via additional of aluminum percentage.
The Effect of Heat Treatment on Hardness and Microstructure of Al-Cu Squeeze Casting Product Saifullah, Ali; Reynaldi, Ferdian; Aisyah, Iis Siti; Heri Soegiharto, Achmad Fauzan
JEMMME (Journal of Energy, Mechanical, Material, and Manufacturing Engineering) Vol 4, No 1 (2019)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (702.787 KB) | DOI: 10.22219/jemmme.v4i1.8531


This research was conducted with the purpose of knowing the change mechanical properties of Al - Cu squeeze casting product which applied  heat treatment and quenching. This study uses Al with the addition  of 2% and 4% Cu,with the squeeze casting pressures applied are 100, 200, 300 and 400 bar.  Heat treatment temperature constant at 520 ° C and 90 minute holding time. The heat treatment results were observed using Optical Microscopy with 800 times magnification and the hardness was measured using the Vickers hardness test method. . The highest result of hardness is on the pressure  400 bar with the addition of 4% Cu which is 120.53 VHN and the average percentage of the most Al2Cu compounds is 23.125%. Heat treatment followed by quenching process significantly increase the hardness, it is  because of the more solid and smaller granular shape due to quenching