bluuebunny/crossref_metadata_2025 huggingface dataset:
PERBEDAAN KESIAPAN KERJA SISWA KELAS HONDA DAN KELAS REGULER KOMPETENSI KEAHLIAN TEKNIK DAN BISNIS SEPEDA MOTOR DI SMK NEGERI 9 MALANG
Authors: Akbar Asror Arroziqil , Sholah Agus , Mindarta Erwin Komara
Published: March 2022

Penelitian ini dilakukan untuk membuktikan perbedaan kesiapan kerja peserta didik XII TBSM Honda dan peserta didik reguler XII TBSM di SMK Negeri 9 Malang. Penelitian menggunakan studi komparatif dengan metode kuantitatif. Tahap analisis data yang digunakan dalam penelitian ini meliputi uji validitas dan reliabilitas, analisis deskriptif, uji normalitas dan homogenitas, uji perbandingan (uji-t). Hasil uji-T X̅ Kesiapan kerja diperoleh sig. (2-tailed) Kelas Honda dan kelas reguler 0,000. Jadi kesiapan kerja peserta didik XII TBSM honda dan peserta didik XII TBSM reguler di SMKN 9 Malang mengalami perbedaan yang signifikan.
PROGRAM INTERVENSI BUDAYA KESELAMATAN DAN KESEHATAN KERJA DALAM MENUMBUHKAN PERILAKU SADAR KESELAMATAN DAN KESEHATAN KERJA DI JURUSAN TEKNIK KENDARAAN RINGAN
Authors: Hermanto Didik , Rahmansyah Muhammad Shalahuddin
Published: March 2022

Angka kecelakaan kerja dapat diminimalisir dengan mengidentifikasi faktor-faktor yang mempengaruhi terjadinya peningkatan angka kecelakaan kerja. Diharapkan bahwa penerapan program intervensi budaya keselamatan dan kesehatan kerja dalam  menumbuhkan perilaku sadar keselamatan dan kesehatan kerja di jurusan teknik kendaraan ringan dapat menjadi solusi dan mengurangi angka kecelakaan kerja khususnya di Indonesia. Model keselamatan dan kesehatan kerja yang sesuai dengan karakter peserta didik SMK adalah model Health belief model . Health belief model merupakan sebuah model perilaku sehat yang mudah diterapkan dan diterima oleh masyarakat Indonesia , sehingga akan menciptakan sebuah perilaku budaya keselamatan dan kesehatan kerja (K3) dalam menjalankan pekerjaan atau kehidupan.
PENGARUH SELF REGULATED LEARNING DAN LITERASI INFORMASI DIGITAL TERHADAP PRESTASI BELAJAR MAHASISWA PROGRAM PENDIDIKAN TEKNIK OTOMOTIF
Authors: Prasetyo Yogi Bekti , Hadi Syamsul , Partono Partono
Published: March 2022

Penelitian ini bertujuan untuk menguji pengaruh kemampuan self-regulated learning yang diintegrasikan dengan keterampilan literasi informasi digital terhadap prestasi belajar mahasiswa. Metode yang digunakan adalah penelitian eksplanasi yang dikategorikan dalam penelitian kuantitatif dan dilakukan secara simultan. Analisis data menggunakan analisis regresi berganda. Hasil penelitian menunjukkan bahwa kemampuan self-regulated learning yang didukung dengan keterampilan literasi informasi digital berpengaruh terhadap prestasi belajar mahasiswa. Faktor yang mempengaruhi prestasi belajar secara simultan meliputi emosi akademik, kognisi, metakognitif, motivasi dan perilaku.
PENGARUH PENGGUNAAN VARIASI CAIRAN PENDINGIN TERHADAP TEMPERATUR MESIN SEPEDA MOTOR MATIC 125CC
Authors: Fauzi Achmad Fanny , Nauri Imam Muda , Mindarta Erwin Komara
Published: March 2022

Penelitian ini bertujuan untuk mengetahui pengaruh penggunaan variasi cairan pendingin terhadap temperatur mesin sepeda motor matic 125cc. Rancangan penelitian yang digunakan dalam penelitian ini adalah kuasi eksperimen dengan desain penelitian Randomi Zed Pretest-Posttest Design. Berdasarkan analisis data, didapatkan bahwa nilai signifikansi hasil uji hipotesis menunjukkan angka 0,046 yang berarti nilai signifikansi < 0,05. Dengan demikian, dapat disimpulkan bahwa terdapat pengaruh yang signifikan antara variasi cairan pendingin terhadap temperatur mesin sepeda motor matic 125cc.
EFEKTIVITAS PROJECT-BASED LEARNING UNTUK MENINGKATKAN PEMAHAMAN GAMBAR RANGKAIAN KELISTIKAN AC MOBIL
Authors: Kusuma Fuad Indra
Published: March 2022

Mahasiswa masih mengalami kesulitan dalam membaca gambar rangkaian kelistrikan. Padahal kompetensi ini bermanfaat sebagai modal untuk melakukan perawatan dan perbaikan sistem AC. Kajian ini bertujuan untuk menguji efektivitas project-based Learning dalam membantu mahasiswa untuk membaca gambar rangkaian kelistrikan. Metode yang digunakan untuk menguji yaitu dengan cara membandingkan hasil pre-test dan post-test sejumlah mahasiswa. Pengujian dilakukan kepada peserta didik matakuliah praktikum AC mobil. Jumlah sample penelitian ini sebanyak 20 mahasiswa. Teknik analisis data yang digunakan adalah t-test. Hasil dari kajian ini menunjukkan bahwa terjadi peningkatan pemahaman mahasiswa dalam membaca gambar rangkaian kelistrikan.
PENGARUH CHARACTER BUILDING, LINGKUNGAN BELAJAR DAN SELF EFFICACY TERHADAP KESIAPAN KERJA SISWA KELAS XII TEKNIK KENDARAAN RINGAN OTOMOTIF DI SMKN 1 TRENGGALEK
Authors: Aji Yudisworo , Partono Partono , Irdianto Windra
Published: March 2022

Tujuan penelitian ini untuk mengetahui pengaruh secara persial variabel Character Building terhadap kesiapan kerja, lingkungan belajar terhadap kesiapan kerja dan self efficacy terhadap kesiapan kerja serta pengaruh secara simultan variabel  Character Building, lingkungan belajar dan self efficacy terhadap kesiapan kerja. Dengan metode penelitian kuantitatif dengan jenis deskriptif. Populasi yaitu siswa kelas XII TKRO SMKN 1 Trenggalek, berjumlah 143 siswa dengan sampel 107 siswa menggunakan teknik proporsional random sampling. Instrumen penelitian yaitu angket dan dokumentasi. Uji instrumen dengan uji validitas dan reliabilitas, analisis data dengan analisis statistik deskriptif, analisis regresi linier berganda, uji asumsi klasik dengan uji normalitas, uji multikolinearitas, dan uji heterokedastisitas. Uji hipotesis meliputi uji t, uji f. Koefisien determinasi (R2) dan sumbangan efektif. Maka dari hasil analisis data diperoleh hasil bahwa terdapat pengaruh yang signifikan Character Building terhadap kesiapan kerja, pengaruh yang signifikan lingkungan belajar terhadap kesiapan kerja, pengaruh yang signifikan self efficacy terhadap kesiapan kerja dan pengaruh signifikan Character Building, lingkungan belajar dan self efficacy terhadap kesiapan kerja siswa kelas XII TKRO di SMKN 1 Trenggalek.
PERBEDAAN PENGGUNAAN MEMBRAN RACING FIBER DAN STANDAR TERHADAP DAYA MESIN MOTOR 2 LANGKAH 135 CC DENGAN BAHAN BAKAR PREMIUM
Authors: Khafid Mukhammad , Paryono Paryono , Poerwanto Eko Edi
Published: March 2022

Pada penelitian ini pada dasarnya untuk mengetahui apakah ada perbadaan daya yang dihasil mesin motor 2 langkah 135cc dengan menggunakan membran racing fiber dan standar. data diambil sebanyak 5 kali pengulangan selanjutnya diambil rata-rata pada tiap putaran mesin yang telah ditentukan yaitu pada putaran 3000 RPM sampai dengan 9000 RPM dengan rentang 1000 RPM, dari proses pengujian daya yang dilakukan terdapat perbadaan daya yang dihasilkan dari membran racing fiber dan membran standar. Mesin motor yang menggunakan membran racing fiber dengan putaran maksimal (9000 RPM) menghasilkan daya sebesar 18,89 HP sedangkan mesin motor yang mnggunakan membran standar menghasilkan data sebesar 18,47 HP dari hasil pengujian tersebut terdapat selisih daya yang dihasilkan mesin motor yang menggunkan membran standar dan membran racing fiber sebesar 0,42 HP.
PENGARUH KATALITIK KONVERTER TERHADAP INTENSITAS SUARA DAN KONSUMSI BAHAN BAKAR PADA MOTOR SEBARIS 4 SILINDER 4 LANGKAH 1500 CC KONVENSIONAL
Authors: Naufal Bahiyal , Poerwanto Eko Edi , Irdianto Windra
Published: March 2022

Tujuan penelitian untuk mengetahui pengaruh katalitik konverter terhadap intensitas suara dan konsumsi bahan bakar pada motor sebaris 4 silinder 4 langkah 1500 cc konvensional. Objek menggunakan mobil Toyota Kijang KF50 dengan perlakuan berupa variasi putaran rpm sebesar 1500, 2500, dan 3500 rpm serta penggunaan katalitik konverter (pakai dan tidak pakai). Data dianalisis statistik dengan uji Two-way Analysis of Variant (ANOVA) dengan taraf kepercayaan 95% (α = 0,05) didahului dengan uji normalitas data (Shapiro-wilk) dan uji homogenitas (Levene test). Hasil setelah dianalisis Two-way  ANOVA menunjukkan bahwa katalitik konverter berpengaruh sinifikan terhadap intensitas suara dengan nilai 0,00 < 0,05 dan konsumsi bahan bakar senilai 0,00 < 0,05 pada motor sebaris 4 silinder 4 langkah 1500 cc konvensional. Hasil uji lanjut Tukey, perlakuan intensitas suara pada putaran mesin 1500 rpm menunjukkan pengaruh paling signifikan terhadap penurunan intensitas suara sebesar 77,075 dB dan konsumsi bahan bakar sebesar 76 mL.
PENGEMBANGAN APLIKASI ANDROID BERBASIS ADOBE FLASH KOMPETENSI MENJELASKAN CARA KERJA ENGINE 2 DAN 4 LANGKAH DI SMKN 11 MALANG
Authors: Pratama Khusnul Yulio , Sholah Agus , Mindarta Erwin Komara
Published: March 2022

Dengan tersedianya pembelajaran menggunakan teknologi aplikasi Android di smartphone pendidik dan murid bisa melaksanakan proses belajar mengajar menjadi lebih baik, dan merangsang minat belajar murid. Riset ini bermaksud untuk: 1) Untuk membuat alat pembelajaran berupa aplikasi android mendasar adobe flash pada pelajaran mengartikan Cara Kerja Engine dua dan empat tak. 2) Untuk melihat Kepantasan alat pembelajaran android mendasar adobe flash pada pelajaran mengartikan Cara Kerja Engine dua dan empat tak yang layak dan efektif untuk murid kelas X TKRO SMKN 11 Malang. 3) Untuk mengetahui respon murid kelas X TKRO SMKN 11 Malang terhadap alat pembelajaran android mendasar adobe flash pada pelajaran mengartikan Cara Kerja Engine dua dan empat tak. Metode yang digunakan pada penelitan ini adalah metode pengembangan ADDIE yakni: (1) Analisys, (2) Design, (3) Development, (4) Implementation, (5) Evaluation. Alat pengumpulan data yang digunakan dalam riset dan peningkatan ini berbentuk angket yang di Konfirmasi oleh ahli alat, ahli materi, dan respon dari murid. Hasil riset menunjukkan bahwa alat pembelajaran yang telah dikembangkan berlandaskan skor ahli alat meperoleh prosentase 94,6% yang dengan kategori sangat layak, data dari hasil skor ahli memperoleh prosentase 92,4% yang dengan sangat layak, serta hasil uji skala kecil memperoleh prosentase total 89,8%.
PENGARUH PEMBERIAN TUGAS RANGKUMAN PRA PEMBELAJARAN TERHADAP KEAKTIFAN DAN HASIL BELAJAR PESERTA DIDIK PADA KOMPETENSI DASAR MEMAHAMI KLASIFIKASI ENGINE DI SMK NEGERI ROWOKANGKUNG
Authors: Hikam Muhammad Ilhamni Uluumal , Sholah Agus , Mindarta Erwin Komara
Published: March 2022

Pada dasarnya ada dua faktor yang mempengaruhi minat belajar siswa yaitu faktor eksternal dan faktor internal. Penelitian ini bertujuan untuk mengetahui pengaruh positif dan signifikansi pemberian tugas rangkuman pra pembelajaran terhadap keaktifan dan hasil belajar peserta didik. Rancangan penelitian yang digunakan dalam penelitian ini adalah pendekatan kuantitatif dan jenis eksperimen. Populasi dari penelitian ini adalah siswa kelas X Kompetensi Keahlian Teknik dan Bisnis Sepeda Motor di SMK Negeri Rowokangkung Lumajang dengan jumlah 60 siswa. Teknik analisis data yang digunakan adalah uji analisis deskriptif, uji prasyarat analisis, dan uji hipotesis. Berdasarkan analisis data, hasil penelitian ini menunjukkan bahwa: (1) Terdapat pengaruh yang positif dan signifikan antara pemberian tugas rangkuman pra pembelajaran terhadap keaktifan peserta didik, (2) Terdapat pengaruh yang positif dan signifikan antara pemberian tugas rangkuman pra pembelajaran terhadap hasil belajar peserta didik.
Analisis Lentur Balok Penampang T Berlubang Memanjang Menggunakan Metode Elemen Hingga Non-linier
Authors: Sukarno Praganif , "." Muslikh , Sulistyo Djoko
Published: March 2022

Numerical analysis is a time-, cost- and equipment-effective method to study the behavior of structures. ATENA is one of the available software-based on finite element method. Hollow cross section is one way to reduce the weight of concrete beam. The effect of holes on beam may reduce the bending resistance. The hollow beam was numerically modeled which and subsequently analyzed using the ATENA v.2.10 software. Material parameters being used as input data was obtained from laboratory tests, assuming that steel-concrete bond was prefect, and and the steel reinforcement was modeled as discrete. The results of numerical analysis of the ATENA were then compared with experimental test results on the flexural behavior and serviceability limit state of reinforced concrete hollow beams lengthwise (Amir, 2010), then study the variation of quality parameters of concrete and the hole size variations. The results shows that the collapse load of hollow beam reached only 96.71% and deflection reached 135.96%. Stiffness of hollow concrete beam was also showed a higher stiffness of the experiment. The crack pattern is flexural fracture and very much agree with that of the experiments. Test parameters of concrete quality variations as well as the hole size variation showed higher concrete quality/size of the hole will reduce the ductility of beam.
Pengaruh Fraksi Volume Serat dan Lama Perendaman Alkali terhadap Kekuatan Impak Komposit Serat Aren-Polyester
Authors: Kuncoro Diharjo M. Budi Nur Rahman , Bambang Riyanta ,
Published: March 2022

Palm fiber waste in the industrial processing of starch sugar palm has potential as reinforcing material composite material. This research to determine the effect of fiber volume fraction and long immersion in alkaline solution (NaOH) 5% for the impact strength composites waste palm fiber-polyester. The material used is a waste of palm fiber, unsaturated polyester 157 BQTN, MEKPO catalyst and 5% alkaline solution. Preparation of composites made by the method of press mould. The Composites made with variations of the volume fraction of 10%, 20%, 30%, 40%, 50% and long immersion alkali solution is 0, 2, 4, 6, and 8 hours. The impact test conducted by Izod impact testing machine refers to the standard ASTM D 5941. The results showed that increasing the volume fraction will increase the impact strength, but the subsequent decline. The longer the alkali treatment will reduce the impact strength because the fiber has undergone treatment. The impact strength maximum of the composites with fiber volume fraction of 40% and without alkaline immersion of 0.3211 J/mm2. Characteristics of a broken section of palm fiber composite material are a polyester matrix of a single fracture.
Peranan Teknologi Solar Cell dalam Peningkatan Daya Saing Usaha Kecil dan Menengah
Authors: Iswanto Rif’an Tsaqif As Sadad ,
Published: March 2022

Rolling blackouts or blackouts caused by technical errors making people uncomfortable, one of those affected are Micro, Small and Medium Enterprises (MSMEs), due to power outages in various regions in Indonesia made a number of MSMEs to be losers. In addition to the problems faced by MSMEs is the occurrence of the peak load at night cause they can not work in the evenings (overtime). For that alternative energy is necessary for the SMEs in order to work, when electricity from PLN is susceptible to interference (fault) or in the repair process. With the considerations above, this study attempted to apply the technology Solarcell Home System (SHS) to be implemented as an energy reserve and secondary in the industrial sector, particularly in the MSMEs. The results showed that the use of technology can enhance business transformation solarcell through speed, and accuracy in producing goods. The SME entrepreneurs can increase production by using solarcell home system.
Utilizing High Density Polyethylene (HDPE) Synthetic Aggregate as a Chip Sealing Material in Improving Skid Resistance
Authors: Rahmawati Anita
Published: March 2022

There are four main factors causing traffic accident : human factor, vehicle factor, road factor and environment factor. Accident data from Poltabes Yogyakarata in 2007 showed that road factor causes accident is 2.45%. In effort to achieve traffic safety, the infrastructure must be considered in the first list. This research is dealing with “Utilizing High Density Polyethylene (HDPE) Synthetic Aggregate as a Chip Sealing Material in Improving Skid Resistance”. The purpose of this research is to understand the effect of chip sealing using HDPE synthetic aggregate on the skid resistance, so that the surface pavement can provide good service for traffic and road users and the quantity of accident can be reduced. In this research the skid resistance was  measured using British Pendulum Tester such that the its skid resistance is also called British Pendulum Number (BPN). BPN is a measured based on 3 variations of aggregate weight being spreaded, that are 240 grams, 271 grams and 304 grams. The result of BPN will be correlated with the wet accident ratio, friction coefficient and stopping distance. The BPN values being obtained are 55.96, 55.6 and 53.4, respectively. The BPN was found to increase with the increase of aggregate weight in chip seal mixture. It was revealed that BPN with chip sealing using HDPE could be increased by approximately 10 % in comparison with that without chip sealing. In addition, chip sealing using HDPE can reduce the accident ratio by 47.32 %, improve the traffic safety by 47.32 %, and shorten the stopping distance. The greater friction coefficient the lower stopping distance, and the lower stopping distance the better traffic safety.
Pemantauan Lapangan Sistem Penerangan Tenaga Surya 6 x 50 Wp di Sleman
Authors: Nadjib Muhammad
Published: March 2022

Solar module and battery are important components in photovoltaic systems. These components have higher investment cost compared to controller device, lamp, cable, and the frame. Currently, there are six of 50 Wp of solar lighting systems (SLS) installed for cowshed lighting purpose in Sleman. The aim of this research is to investigate the pattern of electricity usage in SLS and to assess its performance, especially in the solar modules and their batteries after two months period of operation. The output voltage and current of solar module, the voltage of charging battery, the load consumption time, and the battery voltage at the end of charging and discharging were measured. The data were analyzed to determine the output power of solar module, average daily load, system performance ratio, and battery performance. It was revealed that the average daily load and performance ratio are 7.26 Ah/day and 49% respectively. Whilst at the end of charging of the battery is 100%, the maximum depth of discharge is 18.03% and its average efficiency is 59.85%. Overall, the SLSs have been well-operated; the solar module has produced electricity and all of the batteries were fully charged from the daily sunlight. However, it appears that the level of electric energy usage is still low. To increase the SLS’s efficiency it is recommended to optimize the usage of the produced electricity by intensifying livestock handling during night time. This solution also needs periodical monitoring of the SLSs which in turn will increase their lifetime.
Pengaruh Fraksi Volume Serat terhadap Sifat-sifat Tarik Komposit Diperkuat Unidirectional Serat Tebu dengan Matrik Poliester
Authors: Berli P. Kamiel M. Budi Nur Rahman ,
Published: March 2022

Sugar cane fiber has not optimallybeen used as reinforcement of compositematerial. So far, bagasse has been used as  firewood-substitute, raw material for papers, and brake lining. The purpose of this study is to investigate the effect of fiber volume fraction, Vf, on tensile strength of unidirectional sugar cane fiber/polyester composites. The material being used was sugar cane fiber, 268 SHCP BQTN  polyester resin and catalyst . Fibers were soaked in alkali (NaOH) 5% for 2 hours in order to remove their impurities. Composite panels were made with a printing press and the volume fractions of the fiber were 0%, 10%, 20%, 30% and 40%. Prior to being cut into specimens, the panels were subsequenlypost-cured at a temperature of 60 0C for 4 hours. Tensile testing wa carried out according to theASTM D638 standard, and fracture area photo macrographs of selected sampleswere analysed in order to find out the characteristics of fracture. It was found out that increasing the fiber volume fraction resulted in thedecrease of tesilestrength and strain,butincrease of the modulus of elasticity . The highest average tensile strength and strain was obtained at Vf = 0% (31.44 MPa and 9,11%), and a tensile modulus of elasticity was at Vf = 20% of 426.92 MPa. The observations on the photo macrographs showed thatcomposite fracture predominantly occuredspecimens withVf = 30%, and single fracture combined withfiber pull-out was identified for those ofVf = 0%, 10%, 20% and 40%.
Model Power System Stabilizer Berbasis Neuro-Fuzzy Adaptif
Authors: Ramadoni Syahputra Agus Jamal ,
Published: March 2022

Low frequency oscillations are detrimental to the goals of maximum power transfer and optimal power system security. A contemporary solution to this problem is the addition of power system stabilizers (PSS) to the automatic voltage regulators on the generators in the power system. For large scale power systems comprising of many interconnected machines, the PSS parameter tuning is a complex exercise due to the presence of several poorly damped modes of oscillation. The problem is further being complicated by continuous variation in power system operating conditions. This research proposes the PSS model based on adaptive neuro-fuzzy for designing robust power system stabilizers for a multi machine system. Simulations were carried out using several fault tests at transmission line on a Two-Area Multimachine Power System. Simulation is done by using Matlab-Simulink software. The result shows that power transfer response using the model is more robust than Delta w PSS, especially for single phase to ground fault.
Implementasi Mikrokontroler Sebagai Pengendali Lift Empat Lantai
Authors: Jihad Anwar Sadad Rif’an Tsaqif As Sadad , Iswanto ,
Published: March 2022

In large multi-story buildings stairs to connect one floor with another floor. Itulization of stairs may not be efficient, as many technological advancement created lift for high rise buildings. An elevator being electronically controlled may be used to connects all floors within the building. in roder to be able to function as intended. The elevator control system prototype being produced uses a microcontroller as a controller. The microcontroller being used is the ATmega16 type. Actuator is used as a DC motor drive rotating at 300 rpm to produce a stable rotation and meet the quite large torque. This system uses a queue keystrokes. The system has functioned well and can work as expected. Lift can work in accordance with keystrokes outside and inside the elevator.
Perbaikan Balok Beton Bertulang dengan Metode Jacketing dengan Bahan Ferosemen Akibat Beban Siklik pada Beban Ultimit
Authors: Muslikh Bagus Soebandono , Andreas Triwiyono,
Published: March 2022

A large number of buildings construction was made of reinforced concrete structure, composed of concrete and steel. The reinforced concrete structure elements could experience damage due to earthquake, from light to heavy failure, such as heavy bending-shear crack near the beam column joint. It is necessary, therefore, to repair the structure adopted good method and workability. The specimens were part of exterior beam-column joint model. Cyclic lateral load was applied to simulate earthquake load. This research used 3 specimens: US-1, the shear damage specimen as the result of first-step loaded test, then are repaired by using 1 layer rectangular galvanized welded wire mesh became R-US.1. US-2, the shear damage specimen as the result of first-step loaded test, then are repaired by using 2 layers rectangular galvanized welded wire mesh became R-US.2. UBB, the bending damage specimen as the result of first-step loaded test, then are repaired by using 2 layers rectangular galvanized welded wire mesh became R-UBB.   The result showed that the retrofitted on ultimate load by using jacketing ferrocement increased the ultimate strength capacity of 91,667%(US-1 to R-US.1), 81,818%(US-2 to R.US.2) and 28,571%(UBB to R-UBB) respectively. Increasing the hysteretic energy were 215, 66%(US-1 to R-US.1), 273,11%(US-2 to R.US-2) and 389, 84%(UBB to R-UBB). The ductility of retrofitted specimen 6,64(R-US.1) and 12,72(R-US.2). The initial stiffness of retrofitted specimens decreased 60%(US-1 to R-US.1), 40%(US-2 to R-US.2) and 18%(UBB to R-UBB).
Beton Mutu Tinggi dengan Admixture Superplastisizer dan Aditif Silicafume
Authors: Pujianto As’at
Published: March 2022

Increasing concrete strength is one of the main necessities of concrete technology. For more than the last 20 years, high strength concretes with compressive strength ranging from 50 MPa up to 140 MPa have been used worldwide in high rise buildings and bridges with long spans, or buildings in aggressive environments. But in Indonesia high strength concretes possesses maximum compressive strength of 60 MPa. The properties of concrete are affected by cementitious matrix, aggregate, and the transition zone between these two phases. Reducing the water-cement ratio and the addition of pozzolanic admixtures like fly-ash are often used to modify the microstructure of the matrix and to optimise the transition zone. The reduction of the water-cement ratio results in a decrease in porosity and refinement of capillary pores in matrix, but flowing ability of the concrete will also decrease so that it can’t be workable. Then it workablity can be improve by the use of a superplastisizer. The method used refers to the planning of normal concrete, which is contained in the SK-SNI 03-2834-1992. The results showed that superplastisizer with doses of more than 2% of the cement paste does not increase the flowing ability of the paste anymore. For all the rest of the experiments, the superplastisizer dosage was determined about 2 % of the powder mass. The first tests showed a good workability of the fresh concrete and a good self compacting ability with the silicafume dosage of 10 % of the powder mass. The interest in reducing costs for increasing the concrete strength, can be successfully achieved in this research.
Penyusunan Model Elemen Hingga Interaksi Persamaan Aliran dengan Persamaan Sebaran Udara
Authors: Adam Pamudji Rahardjo Jazaul Ikhsan ,
Published: March 2022

Aeration process is one of water treatment processes. The process consists of two physical phenomena, flow, and spreading of air bubble. This research has developed a finite element model for three-dimensional flow and spreading of air bubble. The flow equation employs Navier-Stokes equation. The spreading of air bubble is modeled as convection-diffusion equation. The Navier-Stokes and the spreading of air bubble equation are combined by Navier-Stokes equation with additional new term, which shows the accelerated flow caused by the air bubble moves. The Navier-Stokes equation was solved in four stages, i.e., Taylor Galerkin convection approximation, viscous prediction, pressure correction and velocity correction stages. Galerkin Standard method was used to solve the spreading of air bubble equation. Quadratic brick finite elements with 20 nodes were used on the geometry. To show performance model, comparison to the result of air bubble investigation was carried out. The numerical model that has been obtained is capable of simulating the phenomena of air bubble spreading and flow. The numerical stability analyses showed that the numerical scheme of convection and diffusion equation based on Galerkin is stable for Courant Number £ 0.01 and Peclet Number 125.
Kuat Geser Tanah Pasir yang Distabilisasi Menggunakan Aspal Cair SC60-70
Authors: Elfira Resti Mulya Willis Diana ,
Published: March 2022

Soil is one of the most important parts in construction work. Soil being found in the field are vary in terms of its properties, and its quality usually does not meet the specified requirements for building construction on it including sandy soil. Sandy soil does not have cohesion value (c), so its shear strength is very low and can lead to collapse. Because of that, it needs to be stabilized to improve the parameter of soil shear strength which are friction angle value (φ) and cohesion value (c). Stabilizing material being used in this research is asphalt, in order to improve cohesion and soil density. Asphalt being used in this research is emulsified asphalt SC 60-70 which is Asphalt Cement (AC) dissolved in diesel oil. In this research, the shear-strength of  sandy soil stabilized with emulsified asphalt SC 60-70 was analyzed by means of direct shear-strength testing. It can be concluded from the result that friction angle tends to increase with the increase of the asphalt content. It can also be shown that the lowest friction angle value was found being at 0% asphalt content, 35,753°, while the biggest friction angle value was found being at 5% asphalt content,  38,970° (increased 10,169%).
Uji Model Fisik Water Treatment Bentuk Pipa dengan Media Aerasi Baling-Baling
Authors: Indah Nurfathin Surya Budi Lesmana ,
Published: March 2022

Both water and health are inter-connected things. Water is used for many daily needs. In Universitas Muhammadiyah Yogyakarta, water needs are quite big, such as for bathroom needs, laboratory, mosque and other places. Because of that, water quality in campus need to be examined in order to fulfill requirement of Indonesia Health Ministry (KepMenKes No. 907/2002). That requirement is about water conditions and supervision. This study aimed to analyze the ability of water treatment equipment used by doing analysis of Fe and DO parameters.
Audit Keselamatan Jalan pada Jalan Yogyakarta-Purworejo KM 35-40, Kulon Progo, Yogyakarta
Authors: Hardianto R. Mayuna Wahyu Widodo ,
Published: March 2022

Among 2008 until 2010, Polsek Temon Kulon Progo recorded that there are 197 traffic accidents in arterial road which connecting Yogyakarta and Purworejo. Because of the frequent occurence of accidents at that road, it is necessary to analyze the cause of traffic accident.  Road Safety Audit is needed to identify the highly-risky situation or the potency of accidents happened.This study used checklists and focused on the answer ‘no’ and also identified the other supporting infrastructures that do not meet the standard and technical requirements. Primary data were obtained from field observations by measuring spot speed and supervising traffic facilities along the way, while the secondary data in the form of traffic accident’s data from 2008 until 2010 were obtained from Polsek Temon. The result showed that from 2008 until 2010 at Yogyakarta-Purworejo road KM 35-40 as many as 197 events occurred with 75 person were seriously injured and another 142 people were lightly injured. The number of accident victims who died were male and the highest number of accident victims under the age of 35 years. Most accidents occured at KM 39, and in the morning (86 events). The cause of the accidents was mostly human (137 events). Pedestrians Accident is as many as 6 cases, and head-on is as many as 14 cases. It is also found that road-shoulders were still used as parking area or selling gasoline, as well as placing some flyers. The absence of special lanes for bicycles or other vehicles such as rickshaws, lack of sidewalks so that pedestrians use the road shoulder as a means of foot walking, shoulder width on the ringth and on the left of the road is not symmetrical, and also the -lack of drainage maintenance caused puddles occurs during the rainy season. Placing of power and telephone poles and lines is quite appropriate, but trees that was on the shoulder of the road still needs to be checked regularly so as not to interfere with the sight-distance of road users.
Pengaruh Jumlah Lapisan dan Spasi Perkuatan Geosintetik terhadap Kuat Dukung dan Penurunan Tanah Lempung Lunak
Authors: Widianti Anita
Published: March 2022

One of the ways to improve the mechanical characteristics of soft soil is to provide soil reinforcement which is a geosynthetic sheet overlaid on the soft soil. Previous studies show that the installation of geosynthetic layers in soft soil proved to increase the bearing capacity and reduce the settlement. Theoretically, if more layers of reinforcement are given, the support will be stronger, while the soil of settlement will be reduced even greater. In this study, the influence of the number of layers and vertical distance between geosynthetic layers on the magnitude of bearing capacity, and the settlement in base soil will be assessed. The primary research is a load test on each clay included in model boxes of 120 cm x 120 cm x 100 cm size. Water was added to the soil to achieve the liquid limit conditions, then the soil was strengthened by inserting 60 x 60cm2 HRX200 woven geotextile layers whose tensile strength is 20 kN/m2 with various distances and number of layers among different boxes. The bottom of loading foundation on the top side of the samples is square whose side (B) is of 10 cm. The loading process were done until the soil collapse indicated by visual observation or by the condition of no increase of the load magnitude causing settlement. The results showed that 1 layer, 2 layers and 3 layers geosynthetic correspond to the bearing capacity increase of 60.57%, 213.00% and 402.64%, respectively, and experienced a reduction in soil settlement by 40%, 60% and 70%, respectively, compared to that without any reinforcement. Geosynthetic being placed at a distance of 0.4 B and 0.6 B gives the greatest bearing capacity increase, in the amount of 402.64%. Geosynthetic mounted on distance more than 0.6 B resulted in bearing capacity increase of diminishing percentages.
Pengaruh Penggunaan Abu Sekam Padi sebagai Bahan Pengisi pada Campuran Hot Rolled Asphalt terhadap Sifat Uji Marshall
Authors: Rosyidi Sri P. Atmaja
Published: March 2022

Rice Husk Ash (RHA) has fairly high content of SiO2 and easily obtainable. It is inexpensive since it is the residual waste of the tile or brick combustion process that is not utilized properly. RHA has the potential to be used as filler in Hot Rolled Asphalt (HRA) since it has high flexibility mixture design. The influential characteristic of RHA is that it has fine aggregate fraction. This study aims to discover the physical properties of RHA, the characteristic of the Marshall test properties, the optimum bitumen content, and the economical comparison between the RHA-mixed HRA and the conventional one using stone dust filler. The results of this study indicate that the use of the RHA is able to increase the optimum bitumen content. In terms of economical comparison, the use of RHA as filler material is much more economical than using stone dust as filler.
Studi Kelayakan Investasi Proyek Perumahan pada Proyek Pembangunan Perumahan Aura Tirta Graha Banjarnegara
Authors: Priyo Mandiyo
Published: March 2022

The aim of this study is to evaluate the cash flow and the feasibility of the building investment project of Perumahan Aura Tirta Graha Banjarnegara. The data used in this study were collected from the contractor. The collected data were classified into two groups: primary and secondary data. The primary data cover the direct detailed examination of the research objectives. The data were collected by doing interview and observation. On the other hand, the secondary data were the historic data dealing with the plan and implementation of the project. In this study, there were several methods carried out in measuring the criterion of investment feasibility, i.e.: Break Event Point (BEP), Net Present Value (NPV), Internal Rate of Return (IRR), Payback Period (PP), and Profitability Index (PI).  Evaluation results show that every method demonstrated various performance of the investment appropriateness. From the analysis, it can be concluded that the development plan of Perumahan Aura Tirta Graha Banjarnegara has been carefully analyzed and properly implemented.
Unjuk Kerja Resapan Air Hujan
Authors: Barid Burhan , Nugroho Prasetyo Adi , Huda Asri Lutfi
Published: March 2022

Nowadays, the environmental problems that often occur are flood in wet season and drought in dry season. This happens because the rainwater runoff cannot seep into the ground well and the ground water level is decreased.  Excessive surface runoff can be reduced by a simple water infiltration wells on the land. To determine the efficiency of absorption well, a model was created using infiltration rainfall simulator unit to create the condition of heavy rain. This study aims to analyze the relationship between times and several parameters: soil moisture, the changes in the groundwater table, the runoff time, the volume of rainfall infiltration, and to determine the reliability of models with changes in water table. The study was conducted using the infiltration model unit which was made of steel plate with a size of 170x170x200 cm3. This model is divided into three spaces. The first space, which its size is 150x150x200 cm3, has two tests. The first one is labeled as A test and filled with medium silt with the elevation of -150 cm. The B test is filled with medium clay with the elevation of -125 cm. The second space, with the dimension of 170x20x200 cm3, is used to control the ground water level. The third space is used for measuring absorption capability and has dimension of 30x30x100 cm3. This model has nine holes on each side for measuring soil moisture and the 12th hole underneath is used for measuring changes in ground water level. After the artificial rain descended for 120 minutes, soil moisture and ground water level changes measured in every 10 minutes.
Aplikasi Metode Nilai Hasil (Earned Value Method) pada Sistem Pengendalian Proyek
Authors: Pujihastuti Siti Yuliani , Priyo Mandiyo
Published: March 2022

In a project implementation, the project implementer wants the project completed on time as efficient as possible while the produced quality is in accordance with the initial plan. Therefore, in order to meet the requirements for controlling process and to minimize any deviations that can occur during the project, the earned value method is considered accurate. The aim of this study was to identify the final result of the project which will be achieved in the aspect of cost (whether the project experience gains, losses, or within budget) and time (whether the project is delayed, ended early, or on time as scheduled). The study was conducted on the 4th, 8th, 12th, 16th, and 20th weeks by using the earned value. Earned Value Method, or often called the Concept of Earned Value, is the concept of calculating project costs in accordance with the budget and the scope of job which have been completed or implemented (budgeted cost of works performed). This method combines the cost, schedule, and work performance of a project. Therefore, this method is considered effective in monitoring and controlling project activities.
Pengeringan Tembakau dengan Sistem Hybrid
Authors: Muhammad Nadjib Dwi Aries Himawanto ,
Published: March 2022

Productivity of tobacco crop may be affected by several factors, one of which is the weather that can influence the tobacco drying process. Providing a customized tobacco dryer may help solving these problems. The study begins by designing a solar energy and biomass (tobacco stem waste) combustion followed by manufacturing and data collection of dryer performance. It can be concluded that the dryer for 140 minutes can reduce the moisture content of fresh tobacco leaves to  64%.
Analisis Pelayanan Penumpang Kereta Api Prambanan Ekspres (Prameks) Trayek Yogyakarta - Solo
Authors: Bambang Dwi Bowo Wisnu Wahyu Widodo ,
Published: March 2022

The aim of this study is to find out the service quality to passenger the train of Prambanan Ekspres (Prameks), passengers perception about the train, and the reason for choosing the train. Data of passenger characteristic and service quality to passengers  were collected by using questionnaire distributed to 379 passenger. To analyze the results questioner used Excel. Quality of services provided by PT . KAI  is quite satisfactory for the passengers. Prambanan Express The Train is the most desirable public transport for traveling Yogyakarta - Solo, because travel costs are cheaper , practical , safer and more comfortable than any other transport.
Pengaruh Ukuran dan Kedalaman Geotekstil Teranyam Tipe HRX 200 terhadap Daya Dukung Ultimit dan Penurunan Tanah Lempung Lunak
Authors: Budi Kurniawan Thirayo Anita Widianti , Azmania ,
Published: March 2022

Geotextile as one of improvement material in soft clay soil has been widely used.  This study aims to examine the effect of geotextile dimention and placement depth on ultimate bearing capacity, settlement and Bearing Capacity Ratio of soft clay soil. This test was conducted on a series of square plate foundation loading of 10 cm width on clay soil sample and installing one layer of geotextile-improvement inside with several dimention variations and geotextile depth. Clay soil is on soft condition taken into a box model made of steel plate with the dimention of 120 cm x 120 cm x 100 cm. The result of this research shows that dimension and depth of geotextile affected the bearing capacity and settlement of soft clay soil. There were improvement in ultimate bearing capacity of as high as 3 times higher for geotextile 3Bx3B; 4 times higher for geotextile 4Bx4B; 5 times higher for geotextile 5Bx5B and 6 times higher for geotextile 6Bx6B comparing with bearing capacity of non supported-clay soil. Decreasing of settlement on clay soil was observed on the 3Bx3B improvement (twice lower), and 3 times lower, 4 times lower and 5 times lower for 4Bx4B, 5Bx5B, 6Bx6B, respectively. Geotextile which placed at a depth of 0.4 B and 0.8 B resulted in increased ultimate bearing capacity by 3.13 times. Dimension and depth geoxtile also affect the value of BCR. The highest BCR was on the dimention 6Bx6B on the depth of 0.6 B.
Analisis Pengaruh Metode Taman Hujan dalam Menurunkan Debit dan Kekeruhan Air Limpasan Permukaan
Authors: Jufianto Irfan , Ikhsan Jazaul , Barid Burhan
Published: March 2022

The alteration in land use causes the loss of infiltration areas replaced by rigid pavement yet demand for groundwater is increasing thus unbalance in hydrology cycle occurred and water became the problem for human as the problem for this country nowadays. One of the solutions to keep the storage of groundwater is to make the rain garden in the area near the run-off sources. Nonetheless studied about rain garden only focus on the effect of pollution in the river and study about the impact of reducing run-off debit and turbidity has not been explored yet. Three infiltration models that had been used for this research were infiltration model with soil-only, rain garden, and the rain garden with infiltration hole. The results presented by the study were compared to get the efficient value from each infiltration model in reducing debit and turbidity in the unsaturated and saturated soil. The result of this study showed that the rain garden model with infiltration hole performed better result with unit time reliability for 3 minutes and higher efficiency value of 54.17% on unsaturated soil and 53.81% on saturated soil. It can also reduce the suspension in the surface run-off until 0 mg/l.
Aplikasi Sistem Manajemen Mutu ISO 9001:2008 untuk Menganalisis Kinerja Pabrik Readymix Concrete
Authors: Utami Sholaekhah Ambar , Priyo Mandiyo
Published: March 2022

ISO 9001:2008 define the requirements and recommendation for design and valuation of the quality management system to ensure that the corporation provides the products (goods/services) that meet the needs and also to increase the productivity efficiently. This study aimed to analyse the corporation performance in quantitative and qualitative, to discover the impact and the application of quality management system based on ISO 9001:2008 in PT. Jaya Ready Mix. The method used in this research was descriptive method and data were collected by field observation, interview with staff in technical and quality department. The secondary data also obtained from the record of the corporation. The results show that qualitative and quantitative measurement presented improved performance. It means that both show the parallel trend. Thus it can be concluded that application of quality management system ISO-9001-2008 by PT Jaya Readymix are already in the right condition. The impact of this application was the increasing of quality continuously such as the procedure for saving records, work instruction and controlling in fabrication for ready-mix concrete and also the documents for quality manual, business practices, operating procedures, standards, descriptive information and quality record.
Evaluasi Muka Air Cakung Drain Hilir terhadap Hujan Maksimum 2013 dan 2014
Authors: Harsanto Puji , Sari Muhammad Arif Banjaran , Lesmana Surya Budi
Published: March 2022

Cakung floodway is a drainage channel that plays an importance rule for the overall of drainage system in Jakarta. Rainfall in 2013 and 2014 produced a big flood in Jakarta. Based on flood map Jakarta 2013 and 2014, there are inundated areas due to 2013’s and 2014’s rainfall. So, it is necessary to analyze the flood water level in channel floodway. Using HEC-RAS, this study aimed to evaluate the water level due to the maximum rainfall in 2013 and 2014. HEC-RAS is a tool for 1D hydraulic modeling and has reliability in routing of canal water level or river flooding. The results show that the maximum rainfall in 2013 provides a significant increasing of water level in Cakung floodway compared with the maximum rainfall in 2014. Soon, the need for canal normalization to reduce flood water level in Cakung floodway should be considered.
Pengembangan Energi Panas Bumi yang Berkelanjutan
Authors: Gendut Suprayitno Andiesta El Fandari, Arief Daryanto,
Published: March 2022

Electricity consumption in Indonesia increases rapidly in line with population growth. Electricity contribute to promote prosperity and public welfare as well as encouraging increased economic activity. Electricity has played an important role as one of the vital infrastructure that has support of political and economic as a priority. These situations make electricity demand continue to rise. On the other hand, electricity  production from fossil fuels have not being able to meet high electricity demand. In accordance with government policies to accelerate infrastructure electricity development without ignoring its sustainability then electricity supply is currently focused on renewable energy development. One of renewable energy is geothermal. As the world’s third largest geothermal electricity producer, it is very unfortunate if that great potential from geothermal development and its utilization still not optimal. This article discusses how the sustainable geothermal energy development  in Indonesia. Geothermal energy development as one of the renewable energy becomes very important to be discussed related to fossil fuel reserves are finite, price fluctuations in energy which influenced by world economic and political situation and rising levels of greenhouse gas emission from fuel combustion.
Sifat Mekanis dan Struktur Mikro Pengelasan Gesek Baja Tahan Karat Austenitik AISI 304
Authors: Febri Irwanto Aris Widyo Nugroho, Totok Suwanda,
Published: March 2022

The aim of this study is to investigate experimentally the microstructural properties and welding strengths of the friction welded joints using austenitic stainless steel (AISI 304) base metal. The experiments were carried out using a beforehand designed and constructed experimental friction welding set-up. Firstly, the welding experiments were under different friction pressure (1,38-4,14 MPa) and upsetting pressure (6,90-8,27 MPa). Later, the strengths of the joints were examined by tension test and the results were compared with those of the base metals. Microstructures in the interfaces of the joints were also obtained and examined. The results show that porosities were observed in bondline zone for all specimens. As the friction pressure increased, the fully plastically deformed zone becomes increased.  Tensile test results indicated that, generally the joint strength is increased with an increase of the friction pressure and the upsetting pressure. The friction welded joint strenght were found to be lower than that of the base metal. The detailed fractographic observation confirmed that the brittle rupture occurred at the joint zone.