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Mechanical and thermal properties of recycled polypropylene bamboo fibre-reinforced composites Indah Widiastuti; Devan Hidayat Pratama; Mohamad Lukmanul Hakim; Danar Susilo Wijayanto; Budi Harjanto
International Journal of Advances in Applied Sciences Vol 12, No 3: September 2023
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijaas.v12.i3.pp205-213

In this article, a kind of green composite was prepared from recycled polypropylene (r-PP) which was further reinforced with various loadings of chemically modified bamboo fibres. Effects of bamboo fibre loading on the mechanical and thermal properties of r-PP/bamboo composites were studied. Those properties were characterized by tensile testing, impact testing, thermogravimetric analysis (TGA), and differential scanning calorimeter (DSC). Standardized test specimens with 0%, 10%, 20%, and 30% mass fractions of bamboo fibre were obtained by an extrusion process which was then finalized on injection molding. The experiment revealed the tensile strength and strain of the composite become greater with the increase of bamboo fraction in the ultimate value of 20% mass fraction. The composite with 10% bamboo fibre loading recorded the highest value of impact strength. Meanwhile, it was evident that the presence of bamboo fibre decreased the thermal stability of recycled polypropylene materials. Therefore, this composite material may find good potential for semi-structural loading applications in relatively low-exposure working.

PELAKSANAAN PENERIMAAN PESERTA DIDIK BARU (PPDB) MELALUI SISTEM ZONASI SMA NEGERI KEBAKKRAMAT TAHUN PELAJARAN 2018/2019 Fitri Pramushintha; Muhammad Akhyar; Budi Harjanto
Nozel : Jurnal Pendididikan Teknik Mesin Vol 2, No 3 (2020)
Publisher : Fakultas Keguruan dan Ilmu Pendidikan Universitas Sebelas Maret Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/nozel.v2i2.43244

The purpose of this research are to evaluate: (1) readiness to implement PPDB through a zoning system in Kebakkramat Senior Senior High School 2018/2019; (2) preparation of teachers, principals and vice principals before implementing PPDB through a zoning system; (3) preparation of students and parents in implementing PPDB through a zoning system; (4) supporting facilities and infrastructure in implementing PPDB through a zoning system; (5) the implementation of PPDB through a zoning system in Kebakkramat Senior High School 2018/2019; (6) student learning outcomes after implementing the PPDB zoning system; (7) students and parents satisfaction with the policy of implementing PPDB through the zoning system. This research was conducted at Kebakkramat Senior High School. This study used the CIPP model (Context, Input, Process, Product). The population of this study were teachers, principals, vice principals, students and parents. Data collection techniques used is questionnaires distributed to all respondents and interviewing some respondents. This research was included as fact finding research, which is why instrument reability test was not necessary. Score analysis in range of quality aspects determination for each evaluation components was based on certain criteria. This research shows results: (1) Kebakkramat Senior High School has implemented PPDB zoning system very well; (2) parents and students have a sufficient condition on implementation of PPDB policy; (3) PPDB has a good readiness on implementing the program through zoning system; (4) students and parents have a sufficient readiness in implementing PPDB policy; (5) the implementation of PPDB through the zoning system runs smoothly; (6) inhibiting factors in the implementation of PPDB through the zoning system is the difficult procedures for the students and parents; (7) PPDB policy through the zoning system narrows students’s school choices; (8) teachers experience obstacles in teaching zoned students; (9) after PPDB is implemented through zoning system, students have lower learning outcomes.

PENGARUH PENAMBAHAN SILIKON (Si) TERHADAP SIFAT MEKANIK BAHAN GAMELAN PADUAN PERUNGGU TIMAH PUTIH (CuSn) DENGAN VARIASI KOMPOSISI Khotim Mahfud; Budi Harjanto; Nyenyep Sri Wardani
Nozel : Jurnal Pendididikan Teknik Mesin Vol 2, No 1 (2020)
Publisher : Fakultas Keguruan dan Ilmu Pendidikan Universitas Sebelas Maret Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/nozel.v1i3.50754

This research has an objective to describe : (1) the effect of silicon addition to tin bronze alloy at an elastic properties; (2) the effect of silicon addition to tin bronze alloy at an impact power; (3) the effect of silicon addition to tin bronze alloy at a micro structure level. The research uses an experimental method with descriptive data analysis. The research sample is the result of tin bronze alloy plus silicon. The independent variables of this research are variations in the addition of silicon 1.5%, 3%, and 4.5%. The dependent variable of this research is tin bronze alloy. The results of this research indicate that the increased elastic properties are influenced by the addition of silicon which is known from the calculation of elastic modulus that the highest is 4.5% silicon variation has increased by 21.218% from tin bronze alloy. Broken toughness through the biggest impact test on the addition of 4.5% silicon has an impact value increase of 53.793%. The addition of silicon has an effect on the mechanical properties of the alloy where the elastic properties and impact strength have increased. The resulting microstructure explains that variations in the addition of silicon have an effect on the phase formed on the mechanical properties of the alloy. With the addition of silicon to tin bronze alloy can be recommended as a substitute for gamelan musical instruments.

Analisis Efisiensi Kerja Mesin Pencacah Rumput dengan Variasi Jumlah 4 dan 6 Mata Pisau menggunakan Mesin 5,5 HP Renaldo Adhe Ardianto; Budi Harjanto
Nozel : Jurnal Pendididikan Teknik Mesin Vol 8, No 1 (2026)
Publisher : Fakultas Keguruan dan Ilmu Pendidikan Universitas Sebelas Maret Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/nozel.v8i1.117551

This research aims to determine the effect of the number of blades on the performance of a grass chopping machine, particularly on working capacity, chopping time, and the quality of chopping results, as well as to identify the most optimal blade. The research method employed was an experimental approach with a quantitative design using two variations in the number of blades, namely 4 blades and 6 blades. The tests were conducted using a grass chopping machine powered by a 5.5 HP gasoline engine operating at 2300 RPM, with elephant grass used as the test material. Each variation was tested five times under the same conditions. The performance of the machine was evaluated based on working capacity (kg/hour), chopping time (seconds), and the quality of chopping results measured by the average length of the chopped grass (cm). The results showed that the number of blades significantly affected the machine performance. The average working capacity produced by 6 blades was 274,446 kg/hour, higher than 4 blades which produced 194,698 kg/hour. The fastest chopping time using 6 blades was 12,49 seconds, while 4 blades required 17,18 seconds. In terms of chopping quality, 6 blades produced finer results with an average length of 4,16 cm compared to 4 blades with an average length of 4,52 cm. These findings indicate that the use of 6 blades provides more optimal performance in increasing working capacity, reducing chopping time, and improving the quality of chopped grass.

Analisis Perbandingan Efisiensi Kinerja Mesin Pencacah Rumput 6.5 HP dan 5.5 HP menggunakan 4 Mata Pisau Eki Sripratama; Budi Harjanto
Nozel : Jurnal Pendididikan Teknik Mesin Vol 8, No 2 (2026)
Publisher : Fakultas Keguruan dan Ilmu Pendidikan Universitas Sebelas Maret Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/nozel.v8i2.117552

This study aims to analyze the comparative performance efficiency of grass chopper machines powered by 6.5 Hp and 5.5 Hp using four blades under constant rotational conditions of approximately 2300 rpm. The research employed an experimental method with a comparative design. Data were collected through direct testing of both machines, focusing on effective capacity, fuel consumption, time efficiency, and chopping quality. Each test was repeated five times using measuring instruments including a scale, stopwatch, measuring cup, and ruler. The results show that the 6.5 Hp machine achieved a higher average effective capacity of 196.27 kg/h and time efficiency of 3.26 kg/min compared to the 5.5 Hp machine, which produced 194.7 kg/h and 3.24 kg/min. However, the 5.5 Hp machine demonstrated better fuel efficiency at 0.066 liters/kg, while the 6.5 Hp machine consumed 0.080 liters/kg. The chopping quality of both machines was relatively uniform with no significant differences observed. These findings indicate that engine power affects capacity and working speed, while lower power engines tend to be more fuel efficient. Therefore, machine selection should consider operational needs, scale of use, and fuel efficiency.

STUDI RELEVANSI KURIKULUM KOMPETENSI KEAHLIAN TEKNIK KENDARAAN RINGAN DI SMKN 5 SURAKARTA DENGAN KEBUTUHAN DUNIA INDUSTRI SAAT SISWA MELAKSANAKAN PRAKERIN Farhandika Akbar; Budi Harjanto; Ngatou Rohman
Nozel : Jurnal Pendididikan Teknik Mesin Vol 2, No 3 (2020)
Publisher : Fakultas Keguruan dan Ilmu Pendidikan Universitas Sebelas Maret Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/nozel.v2i2.43243

The purpose of this study was to find out: (1) Competency of expertise discussed in Light Vehicle Engineering Expertise Competence of SMKN 5 Surakarta; (2) Competency of expertise obtained by students of Light Vehicle Engineering Skills Competency of SMKN 5 Surakarta prior to the implementation of internship; (3) Competency of expertise needed by the industrial world from students when implementing internship; (4) Relevance of the Curriculum for Light Vehicle Engineering Competence of SMKN 5 Surakarta with the needs of the relevant industrial world from the implementation of internship. This type of research is a qualitative descriptive study. Sources of information in research are productive teachers and workshop or industry heads with information obtained by interviews and analysis of archives. The research process was carried out in two glasses, namely: first, observing the Competency of Light Vehicle Engineering Skills (KKTKR) of SMK 5 Surakarta to study the curriculum needed, comparing the competencies needed before students use apprenticeship. This competency is then recorded and arranged in the form of a simple questionnaire. The second stage is to bring a list of competencies taken before student internship to the industry to see its relevance to the needs of the industrial world. The results of this study indicate that the competencies discussed in the learning skills at KKTKR SMK 5 Surakarta provide the latest 13 revised curriculum in 2017. Competencies obtained from students in apprenticeship are competencies obtained from semester 1 to 3 mathematics lessons. These competencies are provided with competencies from compulsory subjects in class X, namely Image of Automotive Engineering, Basic Automotive Technology, and Automotive Basic Work. Equipped with competencies from the subjects of Light Vehicle Engine Maintenance, Chassis Maintenance and Transfer of Light Vehicle Power, and Light Vehicle Electrical Maintenance approved in semester XI 3. Competencies needed by the industry to be communicated to student apprenticeships related to automotive basics, such as tools -Technical tools such as hand tools and measuring instruments, general vehicle knowledge, security in workshop work. The industry also emphasizes the work relations of students who are good as supporters of implementing internship. The results of the study can be seen from two sides. Formally, the relevance level is more than 90%. While the implementation, there are findings where the level of understanding of students is still lacking including the basic automotive competencies that should have mastered

PENGEMBANGAN MEDIA PEMBELAJARAN E-PUBLICATION MODUL TEKNIK SEPEDA MOTOR MAHASISWA PENDIDIKAN TEKNIK MESIN FKIP UNIVERSITAS SEBELAS MARET Wisnu Dimas Sasongko; Indah Widiastuti; Budi Harjanto
Nozel : Jurnal Pendididikan Teknik Mesin Vol 1, No 1 (2019)
Publisher : Fakultas Keguruan dan Ilmu Pendidikan Universitas Sebelas Maret Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/nozel.v1i2.32996

Mobile learning has become a great tool for delivering educational resources in which learners can not only access the module anytime and anywhere, but also can actively interact with the learning material. This research aims to design and develop learning material of an automotive engineering course based on mobile device for mechanical engineering education students. The development e-publication module of motorcycle mechanic course employed the ADDIE instructional design model encompassing five steps: analysis, design, development, implementation, and evaluation. The student’s learning style was identified to characterize mobile module target. It was found that majority of the students as user have auditory and kinesthetic, then the module will be designed with the design in accordance with auditory and kinesthetic learning style, therefore the module will be mainly designed on audio-based format. The learning module developed using e-publication software consisting of structured documents combined with audio and video files. Some experts were asked to evaluate the implementation feasibility of the module. The average evaluation score was 85.4%, indicating high acceptance of implementing the learning module. It implies that e-publication module delivery has the potential to gain wider acceptance in engineering education complementing the in-class and practical learning.

KAJI EKSPERIMENTAL PENGGUNAAN KAMPAS REM KOMPOSIT SERBUK BAMBU PADA SEPEDA MOTOR YAMAHA JUPITER Z Ichsan Rusdianto; Ranto Ranto; Budi Harjanto
Nozel : Jurnal Pendididikan Teknik Mesin Vol 1, No 4 (2019)
Publisher : Fakultas Keguruan dan Ilmu Pendidikan Universitas Sebelas Maret Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/nozel.v2i4.46920

This study aims to (1) investigate how the value of the brake lining composite from bamboo powder when tested directly on the motorcycle, (2) investigate the comparative rate of wear of the brake lining composite from bamboo powder towards brake lining Indoparts brand. This research was conducted at the Education Building Engineering, the Faculty of Teacher Training and Education, Sebelas Maret University. The Composition of the brake lining composite from bamboo powder contains bamboo powder, Aluminium powder (Al) and Magnesium Oxide (MgO), the constituent matrix composites is Epoxy resin form which is tested using the test as far as 1500 km. In this study the sampling technique used purposive sampling. The results of this research are (1) The wear rate of the brake lining natural fiber composites from bamboo powder specimen for every 500 km are equal to 0.095 mm in the inside part and the outside part is 0.123 mm for every 500 km, (2) The wear rate of the brake natural fiber from bamboo powder for every kilometer are equal to 0,000246 mm/km and the wear rate of brake lining from Indoparts brand are equal to 0,000496 mm/km.

KAJI EKSPERIMENTAL PERFORMANSI PENGEREMAN KAMPAS REM KOMPOSIT SERAT BONGGOL JAGUNG DALAM KEADAAN BASAH SEBAGAI BAHAN ALTERNATIF KAMPAS REM MOTOR Rochim Nofian; Budi Harjanto; Yuyun Estriyanto
Nozel : Jurnal Pendididikan Teknik Mesin Vol 2, No 3 (2020)
Publisher : Fakultas Keguruan dan Ilmu Pendidikan Universitas Sebelas Maret Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/nozel.v2i2.43250

The study aims to: (1) Investigate the effect of variations in the composition of composites of corn and brass powder brake pads on the coefficient of friction in wet test. (2)Investigate the variations of composite corn and brass powder brake pads which have the highest coefficient of friction in wet conditions. (3)Investigate the ratio braking performance of brake lining composite corncob powder with comparison brake lining. This research is an experimental research with analysis data use descriptive quantitative method. Data were obtained by using Prony Brake engine braking performance test. This research specimen is variation in the composition of brake lining material, namely: first composition with a composition of 20% corncob powder, 40% brass powder, 20% MgO, and 20% polyester resin; second composition with a composition of 30% corncob powder, 30% brass powder, 20% MgO, and 20% polyester resin; and third composition with a composition of 40% corncob powder, 20% brass powder, 20% MgO, and 20% polyester resin. Data obtained from the result of research put into a table and displayed in graphical form, then analyzed. Based on this research the conclusion are: (1) Variations composition the brake lining effect on the value of friction coefficient in wet conditions test. This is indicated by the differences of the value of friction coefficient in every specimen composition, where first composition is 0,3447, second composition is 0,4367, and third composition is 0,3653. (2) The most optimal composition when testing in wet conditions is second composition. (3) Corncob fiber brake lining has a good braking performance when testing in wet conditions. At the optimal composition (second composition) the coefficient of friction is higher than Yamaha which has value of friction coefficient is 0,4271.

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