bluuebunny/crossref_metadata_2025 huggingface dataset:
PENGARUH UNSUR MAGNESIUM DAN HEAT TREATMENT PADA PERFORMA PISTON DARI VELG ALUMINIUM DENGAN ADC 12
Authors: Ulya Amin Hakim Nur , Harjanto Budi , Sriwardani Nyenyep
Published: March 2023

Aluminum alloy is one of the non ferrous metals that are widely used in various fields of life including one of the automotive industry. In Indonesia, the automotive industry is currently experiencing rapid development, as indicated by the number of motorized vehicles.there are many aluminium scrap from velg those are not used intensively, so casting is done through the use of aluminium velg. To prevent damage to the piston and to approach the standard, its hardness needs to be increased, namely by adding magnesium by 0.3% and 0.6% as well as artificial aging heat treatment method at a temperature of 155 ˚C with a variation of holding time used are 2 hours and 4 hours. The original piston has a hardness value 87.5 VHN. It turns out that aluminum velg material has a chemical composition of silicon element (Si) of 12.9% which is not in accordance with the A333.0 standard, so it is necessary to add the ADC 12 in casting to make new piston material. Based on the A333.0 standard, the suitable composition is 75% ADC 12 + 25% aluminum velg with a hardness value is 83.2 VHN, but still below from the original piston hardness. After the addition of magnesium and artificial aging the hardness of the new piston material has increased. The hardness of the material is 75% ADC 12 + 25% aluminum velg which has a hardness over the original piston is a material with artificial aging 4 hours with a hardness value is 87.6 VHN, material with the addition of magnesium elements 0.3% and 0.6% as well as artificial aging 4 hours which had a violence value are 88.6 VHN and 90.2 VHN. The process of adding magnesium and artificial aging also affects the metallography of the material, namely the structure and shape of the microstructure becomes more organized and there is a change in grain size.
PELAKSANAAN PRAKTIK KERJA INDUSTRI PADA PESERTA DIDIK KELAS XI DI SMK NEGERI 2 KARANGANYAR DENGAN MODEL KIRKPATRICK
Authors: Sari Ayu Nuvita , Akhyar Muhammad , Sriwardani Nyenyep
Published: March 2023

This study aims at: (1) obtaining a description the quality of implementation Internship Program Competency Ototronic Engineering class XI in SMK Negeri 2 Karanganyar in terms of the Reaction component; (2 obtaining a description the quality of implementation Internship Program Competency Ototronic Engineering class XI in SMK Negeri 2 Karanganyar in terms of the Learning component; (3) obtaining a description the quality of implementation Internship Program Competency Ototronic Engineering class XI in SMK Negeri 2 Karanganyar in terms of the Behavior component.This research was conducted at SMK Negeri 2 Karanganyar. This study was included in the type of evaluative research (evaluation research) where the evaluation model used was Kirkpatrick's evaluation model. The population in the study were students of SMK Negeri 2 Karanganyar at the Ototronic Engineering Expertise Program and the supervisor of the school in the ototronic engineering expertise program and supervisors in the industry who directly assisted the implementation of industrial work practices. The number of respondents was 108 students, 5 mentors for the ototronic engineering expertise program, and 5 mentors in the industry. Data collection techniques in this study used a questionnaire method that was distributed to students, an interview method with some student respondents, and all school supervisors and industry teachers, and documentation of the final score of Internship. Validity uses fact finding, namely the validity of logic. Therefore, fact finding for reliability testing is not necessary. Score analysis uses average analysis which will be assessed based on research criteria. The results of the study show: (1) aspects of reaction with student respondents who have an average value of 3.88 which includes very high criteria, this is indicated by the results on the indicators giving direction of 3.99; (2) aspects of evaluating learning with student respondents who have an average value of 3.82 which includes very high criteria, this is intended with the results on the discipline indicator of 4.00; (3) aspects of behavior evaluation with student respondents who have an average value of 4.07 which includes very high criteria, this is indicated by the results on the skills indicator after the internship is 4.25; (4) from the results of research conducted to obtaining a comprehensive picture when viewed from the components of reaction, learning, and behavior is very high including very high criteria.
ANALISIS KUALITAS REPAIR WELDING METODE MIG DENGAN PELAKUAN PREHEATING DAN VARIASI ARUS PENGELASAN PADA CAST WHEEL ALUMINIUM
Authors: Susilo Eko Budi , Harjanto Budi , Suharno Suharno
Published: March 2023

The aim of this study are: (1) to identify the chemical composition of the aluminum cast wheel; (2) to identify the shape of the microstructure in the MIG welding method with preheating treatment and variation of the welding current; (3) to obtain the level of violence before and after welding the MIG method with preheating treatment and welding current variations; (4) to obtain the level of impact toughness before and after welding the MIG method with preheating treatment and welding current variations. The study was conducted by taking specimens from the cast wheel in accordance with the research standards used, then welding the MIG method using the ER4043 electrode with preheating treatment and current variations of 90 A, 100 A, and 110 A. The data analysis technique in this study used descriptive data analysis. Analyzing data includes testing the chemical composition, microstructure, price of hardness, impact toughness. Based on the results of the study it can be concluded that: (1) The chemical composition of the cast wheel is Aluminum (Al) 91.74%, Silicon (Si) 7.62% This cast wheel is a type of aluminum series AA4343; (2) The microstructure of the aluminum cast wheel shows that variations in the welding current will affect the size of the aluminum and silicon grains; (3) The hardness value in raw material specimens is 96 HV while the highest hardness value in the welding area is at 100 A welding current which is 60.2 HV, while the lowest hardness value is at 90 A welding current which is 52.0 HV; (4) The value of impact toughness on raw material specimens is 0.45 J / mm2. The lowest impact toughness value with 100 Amperes current is 0.46 J / mm2 and the highest impact toughness value with 110 Amperes current is 0.52 J / mm2.
PENGARUH MATERIAL BILAH DAN KECEPATAN ANGIN TERHADAP PERFORMANSI TURBIN ANGIN HORISONTAL SKALA MIKRO
Authors: Fahrudin Mahfudz , Bugis Husin , Saputro Herman
Published: March 2023

The availability of fossil fuels in Indonesia has recently been running low due to exaggerated use of the fuel. To fulfill the electrical energy needs of the community which more environmentally friendly used, wind turbines can be used. In this study, researchers use a micro-scale horizontal axis wind turbine from wood and composite materials on the blades, where it try to determine the effect of each performance. This study uses an experimental method which is carried out at the Wind Tunnel Laboratory of the Mechanical Engineering Education, Sebelas Maret University. The variables are blades with a variety of composite and wood material. Performance of electrical power is investigated in this research. Data shows that the wind speed 5m/s - 6m/s composite without load produces the highest rotate, which is 544.64 rpm. While, wood material take lower at 494.2 rpm. The wind turbine is driven at 5 m/s – 6 m/s by using 12V of load. It produces 367.68 rpm and 6.771 watts for composites, and 303.6 rpm and 5.047 watts for wood. So it can be concluded blade materials could effect to the turbine performance.
STUDI RELEVANSI KURIKULUM KOMPETENSI KEAHLIAN TEKNIK KENDARAAN RINGAN DI SMKN 5 SURAKARTA DENGAN KEBUTUHAN DUNIA INDUSTRI SAAT SISWA MELAKSANAKAN PRAKERIN
Authors: Akbar Farhandika , Harjanto Budi , Rohman Ngatou
Published: March 2023

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
PELAKSANAAN PENERIMAAN PESERTA DIDIK BARU (PPDB) MELALUI SISTEM ZONASI SMA NEGERI KEBAKKRAMAT TAHUN PELAJARAN 2018/2019
Authors: Pramushintha Fitri , Akhyar Muhammad , Harjanto Budi
Published: March 2023

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 VARIASI UKURAN DIAMETER LUBANG MAGIC RING PADA EXHAUST MANIFOLD TERHADAP TORSI DAN DAYA SEPEDA MOTOR YAMAHA VEGA RR
Authors: Yazid Muhammad Mirwan , Ranto Ranto , Bugis Husin
Published: March 2023

Vehicle performance will decrease with increasing age of use, it can be seen from the weakening initial torque and the power of the vehicle when driving unlike the initial production. Magic ring a tool produced by CV. SUMI INOTECH which utilizes the overlapping process of valves. The magic ring mounted on the header exhaust manifold serves to restore exhaust gas that is wasted from the overlapping process to return to the combustion chamber so as to produce more power to push the piston and the performance of the vehicle will increase. This study used an experimental method with the research object of Yamaha Vega RR in 2014. The magic ring used was the 16 mm magic ring serial number (ASJS032125) and the same magic ring but the inner diameter was enlarged to 18 mm. Using descriptive quantitative data analysis, it was found that the use of the magic ring added torque from the standard condition of 7.42% in the use of the 16 mm magic ring and increased by 7.12% in the use of the 18 mm magic ring. The power of the vehicle increased only 0.24% when using the magic ring 16 mm, and the use of the magic ring 18 mm power remained the same as the standard condition.
KAJI EKSPERIMENTAL PERFORMANSI PENGEREMAN KAMPAS REM KOMPOSIT SERAT BONGGOL JAGUNG DALAM KEADAAN BASAH SEBAGAI BAHAN ALTERNATIF KAMPAS REM MOTOR
Authors: Nofian Rochim , Harjanto Budi , Estriyanto Yuyun
Published: March 2023

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.
PENGARUH PENGGUNAAN CEROBONG DAN BLOWER PADA KONSTRUKSI WATER HEATER GAS LPG
Authors: Kristianto Hari
Published: March 2023

Hot / warm water is needed, especially for bathing purposes. Hot air used for bathing purposes is usually mixed with cold air whose mixture temperature reaches 35ºC to 40ºC. To take advantage of hot water, one of them is to use a water heater which is commonly called a water heater. The aims of this study were (1) to design and manufacture a water heater, (2) to obtain the relationship between air flow and the temperature of the air coming out of the water heater, (3) to obtain a relationship between air flow and the rate of heat transfer received and (4) to obtain a relationship between the flow rate of the water heater. water with water heater efficiency.The designed water heater produces variations in exhaust gas disposal and to obtain data, research is carried out in the laboratory.The results of the research process found that a water heater with a chimney and a blower is the best construction among the 2 other models in this study, with the data: (1) Water heater that is able to compete with water heaters on the market, which is able to produce air heat with a temperature of: 35.4 oC at a flow rate of 7.2 liters/minute, (2) The relationship between the flow of air (m) and the temperature of the water heater (To) can be expressed by the equation: To = –0.2215m3 + 4, 5633m2 – 29.935m + 96,878 (m in liters/minute, To in oC) (3) The relationship between flowing water and the rate of heat transfer is expressed by the equation: qair = –2.6026m3 + 6.9591m2 + 302.15m + 2536,7 (m in liters/minute, Qair in watts) (d) The relationship between flowing water and efficient water heaters can be expressed by the equation: = –0.0376m3 + 0.1006m2 + 4.3666m + 36.66 ( m in liters/minute, in percent).
PROSES PEMBUATAN MESIN PENGEPRES SERBUK KAYU UNTUK MEDIA PEMBIBITAN JAMUR
Authors: Aryanto Dhani
Published: March 2023

Oyster mushroom cultivation business is very tempting. From a financial point of view, it can be said that this business is feasible to run. Especially for hobbyists or entrepreneurs, this business is quite fun and interesting. If we observe, the interest in this cultivation business continues to increase from year to year. Of course, there are many factors that are the reason for the increasing interest in this business, ranging from just a hobby, the mushroom factor as a healthy food or mushrooms as a future food. That means this business will continue to grow for a long time.

From the above, it can be concluded that the development of a business cannot be separated from the existence of appropriate technology. So it takes a pressing machine to compact the planting media in the form of a mixture of sawdust. In a site survey to a place for making consumption mushroom growing media. The pressing process is still manual, but there is also a machine. Pressing with the machine is still at risk of pinching the hand so that it can slow down the production process. Therefore, the risk of making this pressing machine is minimized and the automatic production process can run smoothly so that more results are obtained.

 The machine works up and down by using the clutch lever, pressing the sawdust with a specified density level, namely the initial height of 230 mm to 190 mm.

 

Keywords: Pressing Machine, Mushroom
PENGARUH PENGGUNAAN FERRITE BEAD DAN VARIASI JENIS BUSI TERHADAP TORSI DAN DAYA PADA SEPEDA MOTOR YAMAHA SOUL GT TAHUN 2012
Authors: Febrianto Dicky , Ranto Ranto , Bugis Husin
Published: March 2023

The purpose of this research was to determine: (1) The effect of Ferrite Bead on Torque and Power on the Yamaha Soul GT 2012 motorcycle. (2) the effect of use variations of spark plug type on Torque and Power on the Yamaha Soul GT 2012 motorcycles. (3) The effect of Ferrite Bead and variations of spark plug on Torque and Power on the Yamaha Soul GT 2012 motorcycle. This research is a quantitative type using experimental methods. The data analysis technique used is descriptive analysis. The research was conducted using a DYNOJET tool. The population in this research was the Yamaha Soul GT 2012 motorcycle.From this results of the research, it can be concluded: (1) The use of Ferrite Bead can increase a Torque and Power on Yamaha Soul GT 2012 motorcycle. The results without the use of Ferrite Bead produces a torque of 9,77 N.m at 4502 rpm and power of 7,23 HP at 6107 rpm, while testing using a Ferrite Bead in the middle of the spark plug wire produces a torque of 10,22 N.m at 4660 rpm and power of 7,33 HP at 5438 rpm. There was an increase in torque of 4,61% and an increase of power in 1,38 %. (2) The use of variations of the spark plugs type can increase a torque and power on Yamaha Soul GT 2012 motorcycle. The highest increase in torque and power occurs in the use of Platinum spark plugs. Test result using a Standar spark plug (C7HSA) produce a torque of 9,77 N.m at 4502 rpm and power of 7,23 HP at 6107 rpm, while testing using a Platinum spark plug (CR7HGP) obtained torque of 10,21 N.m at 4650 rpm and power of 7,33 HP at 6209 rpm, and testing using a Iridium spark plug (NGK CR6HIX) obtained torque of 10,04 N.m at 4632 rpm and power of 7,27 HP at 6466 rpm. An increase in torque on the use of platinum spark plugs by 4,5 % and power by 1,38 %. While the increase in torque on the use of iridium spark plugs is 2,76 % and the power is 0,55 %. (3) Interaction of the use of Ferrite Bead and variations of spark plugs type can increase a Torque and Power on Yamaha Soul GT 2012 motorcycle. The test results show the highest Torque and Power namely the use of Ferrite Bead in the middle of spark plugs wire and the use of Platinum spark plugs with a Torque value of 10,38 N.m at 4664 rpm and a power of 7,4 HP at 6294 rpm. There was an increase in torque by 6,24% and an increase in power by 2,4 % from standard conditions.
Pengaruh Penggunaan Variasi Jenis Busi Dan Variasi Bahan Bakar Terhadap Emisi Gas Buang HC, CO, CO2 Dan O2 Pada Sepeda Motor Honda Beat FI Tahun 2016
Authors: Maharbudi Deno , Bugis Husin , Ranto Ranto
Published: March 2023

The purpose of this research are (1) Knowing and obtaining the results of the investigation of the effect of variations in spark plug types on exhaust emissions of HC, CO, CO2 and O2 on Beat FI 2016 motorbikes (2) Knowing and obtaining the results of investigating the effect of variations in fuel on exhaust emissions HC, CO, CO2 and O2 on Beat FI 2016 motorbikes (3) Knowing and obtaining the results of the investigation of the effect of spark plug types and fuel variations on exhaust emissions of HC, CO, CO2 and O2 on Beat FI 2016 motorbikes

This research uses descriptive quantitative research with experimental research methods. Measurement of exhaust emissions in accordance with SNI 09-7118.3-2005. The population in this study was a Honda Beat FI motorcycle. The sample in this study was a Honda Beat FI motorbike in 2016. The data collection technique was using purposive sampling. The research was conducted at Dishubkominfo Surakarta city using the gaz analyzer technotest.

Results of this research is (1) The use of a combination of pertalite fuels and iridium plugs generates the lowest HC rate of 118.67 ppm or a decrease of 32.58% (2) The use of pertalite fuel with platinum plugs decreases by producing the lowest CO rate of 0.487% or decrease 3.31% (3) pertamax fuel with standard plugs resulted in the lowest CO2 exhaust emission of 10.5% with a difference of 2.27 or decrease 17.75% (4) use of pertalite fuel with standard plugs capable of producing O2 exhaust gas emissions of 1.057% or the lowest.
An Experimental Study Of Carburetor Vapors Using The Combination Of Bubbling And Splash Methods With Fuel Variations On Exhaust Gas Emission Of Supra X Motorcycle.
Authors: Irawan Dimas Adi , Ranto Ranto , Rohman Ngatou
Published: March 2023

The use of Vapor carburetor is one way to reduce exhaust emissions where the way it works is to mix fuel and air in the room with an evaporation process so that the air and fuel mixture is more homogeneous. This study aims to determine (1) the effect of the use of Vapor carburetor on exhaust emissions on the Supra X motorcycle; (2) the effect of the use of fuel variations on exhaust emissions on the Supra X motorcycle; (3) the effect of the use of Vapor carburetor and fuel variations on the exhaust emissions of the Supra X motorcycle.
This research is a research, quantitative, descriptive, comparative, with an experimental method. The design of this research uses the 2x2 method which consists of the independent variables, namely the use of vapor carburetor and conventional carburetor as well as variations of pertalite (RON 90) and Pertamax (RON92) fuels. Exhaust emission testing is guided by the Indonesian national standard (SNI) with three repetitions, for 20 seconds per test
The results of the study are as follows: First, the use of Vapor carburetor produces lower exhaust emissions compared to conventional carburetor on a 100cc Supra X motorcycle. Second, pertalite fuel (RON 90) produces lower exhaust emissions compared to Pertamax fuel (RON 92). Third, the effect of the use of the type of carburetor and the type of fuel that produces the lowest exhaust emissions, namely the use of a Vapor carburetor using a combined splash and bubbling method with pertalite fuel with an average of 0.52% CO and 273.67ppm HC.
Pengaruh Jenis Kelamin, Pendidikan, dan Pendapatan Masyarakat terhadap Kesediaan Membayar atau Willingness To Pay (WTP) Mobil Listrik di Surakarta
Authors: Fanani Elvira Wahyu Arum , Bugis Husin , Pambudi Nugroho Agung , Biddinika Muhammad Kunta
Published: March 2023

Indonesia has an ambitious national energy goal of developing electric vehicles (EVs). Electric vehicles can be a solution to reduce energy consumption and carbon dioxide emissions in the transportation sector. So this research has an important role in directing the right policies to realize these targets. This study aims to analyze the factors that influence the people of Surakarta to buy an electric car. The research sample is the people of Surakarta as many as 348 people. The test results were analyzed using multiple linear regression method with analysis using SPSS version 25. The results of this study indicate that gender, education level, and people's income affect the willingness to buy electric cars. These factors together have an effect of 16.5% on the willingness to pay for an electric car. In addition, the average WTP value for purchasing electric cars is estimated to be around Rp. 179,885,058.00.
Pengaruh Variasi Bahan Pengikat Terhadap Kekuatan Cetakan Pasir, Permeabilitas, Fluiditas, Kekerasan Logam dan Kualitas Hasil Pengecoran Logam Paduan Al-Si Dengan Metode Gravity Casting
Authors: Putra Dian Adi , Siswanto Siswanto , Puspitasari Poppy
Published: March 2023

This research was conducted to investigate the effect of binder variation including bentonit, lapindo mud, and portland cement on the silica molding sand strength, permeability, fluidity, metal hardness and the quality of Al-Si alloy casting by using gravity casting method. The experimental design was used on this research and analyzed by using descriptive data analysis. The result showed molding sand containing 15% lapindo mud binder had the highest wet compressive strength (8,73 N/cm2). The molding sand containing 15% portland cement binder had the highest dry compressive strength (>32 N/cm2). The highest wet tensile strength was resulted by the molding sand containing 15% bentonit binder (3,33 N/cm2), while the highest dry tensile strength was resulted by the molding sand containing 15% portland cement binder (18,60 N/cm2). The highest wet shear strength was resulted by the molding sand containing 15% portland cement binder (0,57 N/cm2), while the highest dry shear strength was resulted by the molding sand containing 15% portland cement binder (1,03 N/cm2). The molding sand containing 15% bentonit binder had the finest permeability (210 mm/minute). In the real practical application, the molding sand containing 15% portland cement binder was unable to result an appropriate molding strength when manually compressed in cope and drag (casting flask), thus it was unable to use as metal pouring media. The molding sand containing 15% lapindo mud binder had the finest fluidity but it had the lowest hardness (120,30 HV). The molding sand containing 15% bentonit binder resulted the best Al-Si alloy casting quality and the highest hardness (129,60 HV).
HUBUNGAN KONSEP DIRI DAN KEMANDIRIAN BELAJAR DENGAN KESIAPAN KERJA SISWA KELAS XI SMK NEGERI 2 PENGASIH
Authors: Aditiya Aditiya
Published: March 2023

The purpose of this research are to finds: (1) the relationship of self concept with work readiness of the 11st class student in SMK Negeri 2 Pengasih, (2) the relationship of self regulated learning with work readiness of the 11st class student SMK Negeri 2 Pengasih, and (3) the relationship of self concept and self regulated learning with work readiness of the 11st class student SMK Negeri 2 Pengasih. The hypothesis of this research are: (1) true positive and significant relationship between self concept with work readiness of the 11st class student SMK Negeri 2 Pengasih, (2) true positive and significant relationship between self regulated learning with work readiness of the 11st class student SMK Negeri 2 Pengasih, and (3) true positive and significant together relationship between self concept and self regulated learning with work readiness of the 11st class student SMK Negeri 2 Pengasih. The kind of this research is ex-postfacto. The population of this research are 502 students. The method of sample taking over use Slovin formula with 5% significant level so that it got 222 sample member. The technics of sample taking over have done according to precipitate (Simple Random Sampling). The result of this research analyzed with product moment correlation analyse technics for first and second hypothesis, and double analyse technics for third hypothesis. Before hypothesis test have done, firstly do analyse condition test that used normalitas test, linieritas test, and multikolinieritas test. The result of the research show that: (1) directly, self concept has positive and significant relationship with work readiness of the 11st class student SMK Negeri 2 Pengasih that shown with 0,601 correlation coefficient (rx1,y), where 0,601 rhitung > 0,138 rtabel on 5% significant level, (2) directly, self regulated learning has positive and significant relationship with work readiness of the 11st class student SMK Negeri 2 Pengasih that shown with 0,679 correlation coefficient (rx2,y), where 0,679 rhitung > 0,138 rtabel on 5% significant level, and (3) together, self concept and self regulated learning has positive and significant relationship with work readiness of the 11st class student SMK Negeri 2 Pengasih that shown with 0,674 Rhitung and 132,54 Fhitung > 3,04 Ftabel on 5% significant level. That’s means if the self concept and self regulated learning more high so the work readiness high too, likewise the opposite if the self concept and self regulated learning more low so the work readiness low too
UPAYA MENINGKATKAN PRESTASI BELAJAR SISWA DENGAN MEDIA MODUL PADA MATA PELAJARAN KERJA LAS DI SMK NEGERI 2 KEBUMEN
Authors: Muzani Akhmad , Marwanto Arif
Published: March 2023

This study aims to determine the effect of using the module on students' learning motivation in the subject of welding work. At the same time, to determine the effect of using the module on student achievement in welding work subjects at SMK Negeri 2 Kebumen. The method used in this study is a research method experiment, the implementation of which uses a quasi-experimental type with a nonequivalent control group design. The research was conducted at SMK Negeri 2 Kebumen with a sample of 2 classes, namely class XI TP 1 as a group experiment, class XI TP 2 as the control group. To determine the motivation to learn data collection using observation sheets and questionnaires. While to determine learning achievement data collection in the form of test results carried out before and after the learning process (pretest and posttest). The process of teaching and learning activities in the experimental class uses a module entitled Welding Classroom with the SMAW Process, while the control class uses a lecture learning strategy (conventional). The results showed that the effect of using the module on students' learning motivation is categorized as very high/very positive. Proven from the results of the overall student motivation questionnaire mean is 90.41 and the results of observations with the answer "YES as much as 25. The effect of using the module on student achievement is to improve learning outcomes. It is evident from the experimental class learning outcomes at the pretest, the mean is 52, the median is 52.5, the mode is 46, the highest score is 69, and the lowest score is 34. After using the module, the mean 83, median 83, mode 83, the highest score 97, and the lowest score 60. Calculation of the independent sample test t test with an error rate of 5% shows that t table < tcount (1.669 < 3.619). It was decided that there was a significant difference There is a significant difference between the learning outcomes of the experimental class using module media and the conventional learning control class.

 
PENERAPAN MODEL PEMBELAJARAN PROJECT BASED LEARNING (PJBL) MAPEL GAMBAR TEKNIK MANUFAKTUR
Authors: Aryanto Dhani
Published: March 2023

This study aims to improve student activity and learning outcomes in the subject of Manufacturing Engineering Drawing class XI TPm 3. Observation Results In this subject the teacher is still actively involved in the learning process or commonly called teacher centered. In the learning process the teacher conveys learning using an LCD projector, the teacher gives instructions or examples then students imitate what is exemplified. But in the process students have difficulty following the instructions from the teacher, the teacher must repeat the instructions until the students understand. This takes up a lot of time during the learning process. So there are other topics that the teacher cannot convey to students. Teachers feel unable to deliver teaching materials optimally because of limited teaching hours.The research method used is to apply the Project Based Learning (PjBL) learning model with the subjects of class XI TPm 3 students. Data collection techniques use evaluations in the form of LKPD in which there is an evaluation of knowledge and performance.The results of the holding of students, pre-test before learning cycle 1 obtained results of 39, only a few students who mastered the function of making and modifying 2D CAD drawings. 9 students who are quite mastered and 30 students who have not mastered. After filling out the questionnaire, it turned out that the reason was that the majority of children did not know about 2D drawing with computer applications
Pengaruh Penggunaan Elektroliser Tipe Wet Cell Dengan Variasi Larutan Elektrolit Terhadap Daya Dan Torsi Sepeda Motor JUPITER MX Tahun 2010
Authors: Loblobly Ertonson Timothy , Bugis Husin , Ranto Ranto
Published: March 2023

The objectives of this study were to investigate the effect of using Wet Cell type electrolyzer on the power and torque of Jupiter MX motorcycles in 2010. To investigate the effect of variations in electrolyte solutions on the use of Wet Cell type electrolyzers on the power and torque of Jupiter MX motorcycles in 2010.

This research was conducted at the Automotive Laboratory for Mechanical Engineering Education, Faculty of Teacher Training and Education, Sebelas Maret University, Surakarta and at PT. Motocourse Technology (MOTOTECH) Yogyakarta. This research is a descriptive quantitative research. The research design used was experimental design. The research sample used a Jupiter MX motorbike in 2010. This experimental tool used a Wet Cell type electrolyzer using a variety of pure water, KOH and NaOH electrolyte solutions. The data collection method used in this research is the experimental method.

The results of this study are the use of the Wet Cell type electrolyzer has an effect on the power and torque of the Jupiter MX motorcycle in 2010, namely an increase in power of 0.97 HP and an increase in torque of 1.88 N.m compared to testing standard engine conditions. The use of 24 gram / liter KOH solution in the Wet Cell type electrolyzer has the highest increase in power and torque levels compared to other variations in the ratio of solutions. There was an increase in power of 0.39 HP and an increase in torque of 0.3 N.m compared to the power and torque of using a Wet Cell type electrolyzer with water as an electrolyte solution without a catalyst and 1.36 HP and 2.18 N.m compared to the power and torque of the standard state. The use of 24 gram / liter NaOH solution has the lowest rate of increase, there is an increase in power of 1.33 HP and 1.84

N.m compared to the power and torque of the standard state.
Analisis Pembelajaran Berbasis Hots Pada Peserta Didik Kelas XI TKR DI iSMK Negeri 2 Sukoharjo
Authors: Juliana Erva Nhor
Published: March 2023

The objective from this research is to find Penelitian ini bertujuan untuk: (1) how the learning implementation design (RPP) made by TKR teachers at SMK Negeri 2 Sukoharjo that meets Higher Order Thinking Skills elements; (2) implementation of learning activities carried out by TKR teachers at SMK Negeri 2 Sukoharjo; (3) implementation of learning assessments made by TKR teachers at SMK Negeri 2 Sukoharjo which leads to elements of higher order thinking skills. This research is a mixed methods research. Data sources came from 98 students from TKR XI, Teachers of Smk Negeri 2 Sukoharjo. Data techniques include questionnaires, documentation and observation. This study uses data validity using sampling techniques and the Slovin formula. The research procedure consists of research methods, preparation of research instruments, data collection, data analysis, drawing conclusions. The conclusion is (1) The Learning Implementation design (RPP) made by TKR class XI teachers at SMK Negeri 2 Sukoharjo has damaged it to fulfill the elements of higher-order thinking skills; (2) The implementation of learning activities by TKR teachers at SMK Negeri 2 Sukoharjo has attempted to implement learning activities that lead to higher-order thinking skills; (3) The assessment or evaluation of learning made by TKR teachers at SMK Negeri 2 Sukoharjo has led to elements of measuring higher-order thinking skills.
Pengaruh Konsentrasi Perekat Terhadap Lama Bakar Dari RDF Ampas Kopi Dan Ampas Tebu
Authors: Ramadhan Fery Surya , Wijayanto Danar Susilo , Bugis Husin
Published: March 2023

New and renewable energy (EBT) is an energy source that can be created by humans by utilizing solid waste from industrial processing. One example of making renewable energy is RDF. Refuse Derived Fuel (RDF) is a form of solid waste utilization from industry and households that has a high calorific value that can be used as a new alternative fuel. RDF is a waste treatment that is used as an alternative energy material. The materials used to make RDF in this study were coffee grounds and bagasse. To make it, coffee grounds and bagasse are mixed and an adhesive is added. The mixture ratio is 100:0, 30:70,50:50,70:30, and 0:100 for the adhesive concentration using 10%, 20%, and 30%. The finished RDF-5 was tested by testing the burn time. The test was carried out at the Mechanical Engineering Education Laboratory, FKIP UNS. The method used is the experimental method. The variables studied in this study were the independent variable, the dependent variable, and the control variable. The independent variation consisted of composition variations between coffee grounds and bagasse with the following ratios 100:0, 70:30, 50:50, 30:70, and 0:100 and variations in adhesive concentrations of 10%, 20%, and 30%. The dependent variable consists of burn time. The control variable consisted of an RDF-5 printer with a pressure of 6 kg/cm2 and the filter used with a size of 10 mesh. The results of the best roasting time are 30 bagasse + 70 coffee grounds mixed with 30% adhesive concentration with the result of 1370 seconds.
Anasisis Minat Wirausaha Berdasarkan Jenjang Pendidikan Vokasi Pada Bidang Teknik Mesin
Authors: Prihatin Erika Ayunda , Widiastuti Indah , Rohman Ngatou
Published: March 2023

Entrepreneurship is one aspect that affects economic growth in Iindonesia. Students are the next generation who are expected to be able to create entrepreneurs in the future. The purpose of this research is to analyze entrepreneurial interest based on vocational education level in mechanical engineering and the factors driving this interest. This research uses a mix-method that combines a quantitative approach and a qualitative approach. The subjects of the research were Class XII students of State 2 Vocational High School in Surakarta, department of mechanical engineering, totaling 120 people and D3 Mechanical Engineering students at Sebelas Maret University, totaling 57 people. Data collection techniques to determine the entrepreneurial interest of students (quantitative data) using the questionnaire method while knowing the factors that influence entrepreneurial interest (qualitative data) using the interview method. Analysis of data for quantitative data using descriptive analysis and for qualitative data using thematic analysis. The result showed that the majority of students wanted to be entrepreneurs but a different levels of time. Factors that influence entrepreneurial interest are divided into two, namely internal factors and external factors. The internal factors driving entrepreneurial interest are motivation that comes from the individual’s self and enthusiasm to face risk challenges. External factors driving or family, entrepreneurial interest are motivation the arises due to the influence of friends or family, entrepreneurial experience and entrepreneurship education.
Pengaruh Penggunaan Set Up Voltage dengan Varian Bahan Bakar terhadap Torsi dan Daya Pada Motor Honda Beat
Authors: Yusrian Misbah Alfi , Wijayanto Danar Susilo , Rohman Ngatou
Published: March 2023

The purposes of this study are: (1) To determine the effect of using Step Up Voltage on torque and power of Honda Beat 2013 motorcycles. (2) To determine the effect of using Pertalie and Pertamax fuel variations on torque and power of Honda Beat 2013 motorcycles. (3) Knowing the best configuration of Step Up Voltage and fuel variations on the torque of the 2013 Honda Beat motorcycle. The research method used is experimental. The data of this research was obtained by measuring the sample of Honda Beat 2013 motorcycle. The independent variable was the use of Step Up Voltage with a voltage variation of 13.7 V to 14.7 V with a range of 0.2 V with Pertamax and Pertalite fuel. The dependent variable is the maximum torque of the axle and the maximum power of the axle which is measured using a dynamometer. The data obtained were then analyzed using a comparative descriptive technique by describing the data in the form of graphs, statistics and tables. From these data, a comparison is made between groups of data. The results of this study are: (1) The use of Step Up Voltage can increase the torque and power of the Honda Beat 2013 motorcycle. The largest increase in torque is at a voltage setting of 13.9 V with an average increase of 0.44 N.m from standard conditions. The average maximum power increase of the largest axle is at a voltage setting of 14.1 V, which is 0.30 HP from standard conditions. (2) The use of Pertamax fuel can increase the torque and power of the Honda Beat 2013 motorcycle. The average torque produced is 19.98 Nm, an increase of 0.26 Nm from pertalite fuel and produces an average power of 7.47 HP, an increase of 0.34. HP of pertalite fuel. (3) The best configuration is obtained from the use of a 13.9 V Step Up Voltage combined with Pertamax fuel. Torque increased by 0.44 N.m from standard conditions to 20.41 N.m and power increased by 0.20 HP from standard conditions to 7.67 HP
Analisis Natural Weathering pada Komposit Recycled Polypropylene dan Serat Bambu
Authors: Ramadhani Arianti , Widiastuti Indah
Published: March 2023

Abstract. The main objective of this study was to analyze the effect of Natural Weathering on the tensile strength and microstructure of recycled polypropylene (rPP) composites with bamboo fiber reinforcement. The rPP-bamboo composite specimens were made using extrusion molding and injection molding machines. The weight fraction used in making the specimens was 10% bamboo fiber and 90% rPP. The rPP-bamboo samples were tested with 3 variations of exposure time, 0 months (without exposure), 1 month and 2 months according to ASTM D1435-05 standard. From the 3 variations of exposure, a tensile test was carried out with the ASTM D638 type V standard to evaluate the value of tensile strength, modulus of elasticity and elongation. Then SEM (Scanning Microscopy Electrone) was performed to see the microstructure of the composite. The results showed that the tensile strength at exposure time of 0 months, 1 month and 2 months was 18.1 MPa with an elongation of 5%, 19.5 MPa with an elongation of 6.4% and 19.3 MPa with an elongation of 6.6%. Young's modulus values showed a decrease with increasing exposure time, ranging from 222 MPa in the sample without exposure to 141 MPa at an exposure time of 2 months. With SEM it is known that, the microstructure of the composite at the beginning of exposure shows a strong bond between the fiber-matrix even though there are some voids in the specimen. At 2 months of exposure, it was seen that there was a gap between the matrix and bamboo due to the hydrophilic nature of bamboo fiber.
Pengaruh Jumlah Sudu dan Pembebanan Terhadap Energi Listrik Yang Dihasilkan OlehTurbin Angin SumbuHorizontal Skala Mikro
Authors: Aspriyanti Vita Ayu , Saputro Herman , Wijayanto Danar Susilo
Published: March 2023

The needs of electrical energy particularly in Indonesia is very great and continues to increase every year. The development of a micro scale horizontal axis wind turbine can be a solution to solve that. This research has a purpose to find out the influence of number of blades and wind speed variation on electrical energy produced by micro scale horizontal axis wind turbines. The method which was used in this research was experiment method and it was implemented at the Laboratory of Study Program of Mechanical Engineering Education of Sebelas Maret University. The variable that was used in this research was by using blades with airfoil SG6043 with variations of blades number and the giving load in the form of 12v and 24v LED lights. The horizontal axis wind turbine rotor has a diameter of 800 mm and a blade length of 400 mm which is printed with 3D Printing PLA material. The data collection was implemented on the wind speed of 1 m/s to 5 m/s. The results of this research is the wind turbine that used 5 blades produced the highest power of 9.22 Watt at 24v loading and had the highest power performance value of 0.241 at maximum wind speed of 5 m/s. The number of blades and wind speed and loading could affect the electrical power produced by the turbine, the more blades and the higher the wind speed, the greater the power generated by the turbine.
Analisis Perpindahan Kalor Pada Double Pipe Heat Exchanger Beraliran Lawan Arah Menggunakan Sirip Trapesium Dengan Fluida Cair
Authors: Zulfahmi Muhammad Tsany , Wijayanto Danar Susilo , Widiastuti Indah
Published: March 2023

This study aims to analyze the counter flow performance of a double pipe heat exchanger using an experimental method with the influence of the flow rate of hot and cold substances. The results showed that the counter-flow double-pipe heat exchanger produced a total heat transfer coefficient of 69.229 W/m2℃. The double pipe heat exchanger produces Reynolds number of 82.17 and Nusselt number of 1.18 in hot fluids, while in cold fluids it produces Reynolds number of 4.528.42 and Nusselt number of 31.52. The double pipe heat exchanger has an effectiveness rate of 116.16%.