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Sainteknol : Jurnal Sains dan Teknologi
Published by Universitas Negeri Semarang
ISSN : 02164566     EISSN : 25273604     DOI : http://dx.doi.org/10.15294/sainteknol
Core Subject : Science,
Computer Science & IT
Sainteknol published a scientific paper on the results of research and studies in the field of science and technology. Published biannually in June and December contained the writings lifted from the results of research and critical-analysis study in science and technology.
Arjuna Subject : Umum - Umum
Articles 560 Documents
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KARAKTERISASI LIMBAH PENGOLAHAN KAYU SENGON SEBAGAI BAHAN BAKAR ALTRNATIF Saputro, Danang Dwi; Widayat, Widi
Sainteknol : Jurnal Sains dan Teknologi Vol 14, No 1 (2016): June 2016
Publisher : Unnes Journal

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v14i1.7611

Abstract

Kayu sengon merupakan bahan baku dalam industri pengolahan kayu yang limbah pengolahannya berlum tertangani secara maksimal, biasanya hanya dibuang begitu saja atau dibakar untuk menghilangkan limbah tersebut sehingga perlu dipikirkan mengenai pengolahan limbah hasil proses produksi. Tujuan penelitian ini adalah mendiskripsikan dan menganalisis karakteristik briket yang terbuat dari limbah pengolahan kayu sengon terhadap sifat kimia dan fisika dengan bahan baku murni tanpa diberi perlakuan pada bahan baku. Pembuatan briket dengan cara menimbang bahan baku sebesar 3,5 gram setiap sampel.Sebelum dilakukan pembriketan, cetakan dipanaskan terlebih dahulu sehingga temperatur cetakan menjadi 120 derajat C dengan cara mengatur termokontroler pada temperatur 120 derajat C dan temperatur bahan baku diseragamkan pada temperatur 80derajat C. Pembriketan dilakukan dengan cara pengepresan pada tekanan 200 kg/cm2, 300 kg/cm2 dan 400 kg/cm dengan waktu penahan 1 menit dan dibuat tanpa perekan. Hasil penelitian menunjukkan bahwa densitas naik seiring dengan naiknya tekanan kompaksi tetapi tidak berpengaruh terhadap nilai kalor briket tetapi berpengaruh terhadap energy densitas. Pembuatan briket dengan metode cetak panas mampu untuk meniadakan bahan perekat berbahan dasar air sehingga proses pembuatan briket lebih cepat, briket langsung dapat digunakan tanpa proses pengeringan dan mampu mempertahankan nilai kalor bahan baku.
DEVELOPMENT OF CHEMSITRY TEACHER PROFESSIONALISM THROUGH PEDAGOGICAL CONTENT KNOWLEDGE TRAINING Haryani, Sri; Wardani, Sri; Prasetya, Agung Tri
Sainteknol : Jurnal Sains dan Teknologi Vol 14, No 2 (2016): December 2016
Publisher : Unnes Journal

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v14i2.8996

Abstract

This study aims to analyze the impact of Pedagogical Content Knowledge (PCK) training to the development of chemistry teachers’ professionalism through MGMP. The study involved 5 chemistry teachers who measured the PCK capability through filling CoRe (Content Representation) and writing PaPeRs (Pedagogical and Professional-experience Repertoires), which represents the PCK of a teacher as proposed by Loughran. Quantitative data drawn from the results of the fillingCoRe,Lesson Plan (RPP), and PaP-eRs instruments, whereas qualitative data were taken from the three linkage analysis supported by the results of the interview. Based on the results of data analysis revealed that PCK training can develop the teachers professionalism as measured by the PCK capability especially in minimizing the weaknesses that have been prevalent as how to express apperception, the depth of the material, determine the learning strategies, and pay attention to the prerequisites material.
DEVELOPMENT OF INDUSTRY PRACTICE MODEL IN VOCATIONAL HIGH SCHOOL BASED ENTREPRENEURSHIP Sunyoto, Sunyoto; Khumaedi, Muhammad
Sainteknol : Jurnal Sains dan Teknologi Vol 14, No 1 (2016): June 2016
Publisher : Unnes Journal

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v14i1.7618

Abstract

The main objective of this research is to find models of Industry Practice (Prakerin) based entrepreneurship that oriented to the preparation of students and / or vocational school graduates to become entrepreneurs. This Research is designed in two years using the approach to Research and Development (R & D). Subjects were two vocational high school (SMK) in Semarang, study program of Mechanical Engineering. Data were collected through interviews, questionnaires, observation, and documentation. Analysis of data through qualitative and quantitative approaches, including the stages of data reduction, data presentation, data verification, and conclusion are carried out simultaneously. While the research results show that the implementation of the Industry Practices (Prakerin) at vocational high school (SMK), both in public or private vocational high school is not specifically designed to prepare students to become entrepreneurs. It is therefore important to develop a Industry Practice Model based entrepreneurship.
PENGEMBANGAN PERANGKAT PEMBELAJARAN JOB SHEET BERBASIS PERFORMANCE ASSESSMENT UNTUK MENINGKATKAN KOMPETENSI CONVENTIONAL ENGINE TUNE UP Devi, Putri Laxmita; Wjiaya, M. Burhan Rubai; Suwahyo, Suwahyuo
Sainteknol : Jurnal Sains dan Teknologi Vol 15, No 1 (2017): Juni 2017
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v15i1.9405

Abstract

This research aims to determine the feasibility of job sheet based performance assessment as learning device and to know increasing competence of student in conventional engine tune up learning. Data in this research were obtained using observation, questionnaire, tests and documentation methods. The results of feasibility analyses showed that job sheet get score 95.51% from expert validator, so it is feasible to use in theory. In addition, empirically using of job sheet can enhance competence of students from 33.33% to 80.56%. It can be concluded that job sheet based performance assessment is feasible to enhance competence of students. Thus, it is recommended as learning device to support practical learning.  
CHEMICALLY MODIFIED KAPOK SAWDUST FOR ADSORPSTION OF METHYL VIOLET DYE FROM 1 Widi Astuti, Triastuti Sulistyaningsih AQUEOUS SOLUTION Astuti, Widi; Sulistyaningsih, Triastuti
Sainteknol : Jurnal Sains dan Teknologi Vol 14, No 2 (2016): December 2016
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v14i2.9001

Abstract

The potential of chemically modified Kapok sawdust for methyl violet adsorption was investigated in a batch adsorption process. Various physicochemical parameters such as pH, contact time and initial dye concentration were studied. The adsorbent was characterized with Fourier transform infrared spectrophotometer, scanning electron microscope and Brunauer, Emmett and  Teller (BET) analysis. The optimum conditions for methyl violet adsorption were pH 5 and contact time 30 min. Langmuir, Freundlich and Redlich-Peterson isotherm model were used to analyze the equilibrium data. The experimental data fitted well with the Redlich-Peterson model, with the value of constants are 41.001 L g -1 for K R , 0.523 L 0.799 mg -0.799 for a and 0.799 for β
PENGEMBANGAN AKSELEROMETER RUNNING MONITOR BERBASIS ANDROID UNTUK MENGETAHUI KARAKTERISTIK LARI JARAK PENDEK Hartono, Mugiyo; Akhiruyanto, Andry; Fathoni, Khoirudin
Sainteknol : Jurnal Sains dan Teknologi Vol 15, No 2 (2017): Desember 2017
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v15i2.12405

Abstract

Penelitian ini bertujuan: a) merancang   alat pemantau aktifitas lari jarak pendek  menggunakan  akselerometer  berbasis    android    dengan  biaya  murah, akurat  dan  reliable;  b)  Mengetahui  kecepatan  sesaat,  panjang  dan  frekuensi langkah lari jarak pendek; c) Menghasilkan produk akselerometer running monitor berbasis android yang dapat mengetahui karakteristik lari jarak pendek. Metode penelitian yang digunakan menggunakan metode penelitian pengembangan yang meliputi model pengembangan, prosedur pengembangan dan ujicoba produk. Tahap model dan prosedur pengembangan merupakan langkah- langkah pembuatan produk dimulai dari mempersiapkan akselerometer witilt v3.0 tiga sumbu dengan pengaturannya hingga pembuatan program menggunakan Microsoft Visual Basic (VB). Ujicoba produk dilakukan dengan validasi ahli telemetri dan programmer VB. Subjek penelitian merupakan atlet pemula. Lembar obversai dipersiapkan untuk mengambil data Raw ADC sebagi output akselerometer dan kuosioner sebagai respon pengguna produk. Hasil penelitian menunjukkan bahwa akselerometer pada android dapat mengirimkan   data   dan   diolah   oleh   program   yang   telah   dibuat.   Program selanjutnya menampilkan informasi karakteristik lari yaitu kecepatan, panjang dan frekuensi langkah. Sistem dan aplikasi untuk mengetahui percepatan, dan mengestimasi kecepatan  dan  jarak  tempuh  pelari  telah  berhasil  diimplementasikan  sehingga pelari maupun pelatih dapat mengetahui kelemahan dari pelari di jarak maupun detik  tertentu  sehingga  dari  sana  dapat  diperbaiki  dan  dilakukan  pelatihan sehingga diharapkan atlet dapat mencapai jarak 100meter dalam waktu yang lebih singkat. Pada sistem ini, di smartphone Android hanya digunakan untuk merekam data percepatan pelari dan disimpan pada memory baik internal maupun eksternal. Namun, untuk pengolah data percepatan, estimasi jarak dan posisi, filter kalman dilakukan pada PC. Untuk tahapan berikutnya dapat dikembangkan pengolahan data, tersebut langsung dilakukan pada smartphone Android sehingga setelah berlari,  atlet  maupun  pelatih  dapat  langsung  menganalisis  hasil  yang  dicapai pelari, tidak perlu memindahkan datanya ke PC terlebih dahulu.
PENGARUH JENIS COOLANT DAN VARIASI SIDE CUTTING EDGE ANGLE TERHADAP KEKASARAN PERMUKAAN BUBUT TIRUS BAJA EMS 45 Mujahid, Ma'ruf; Sumbodo, Wirawan; Pramono, Pramono
Sainteknol : Jurnal Sains dan Teknologi Vol 15, No 1 (2017): Juni 2017
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v15i1.10158

Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh jenis coolant dan variasi sudut Side Cutting Edge Angle terhadap kekasaran permukaan bubut tirus EMS 45. Dalam proses pembubutan tirus, sebanyak 12 benda kerja mendapatkan perlakukan yang berbeda, yaitu dengan variasi jenis coolant dan variasi sudut side cutting edge angle (SCEA). Hasil penelitian dapat disimpulkan pada penggunaan jenis coolant yang menghasilkan nilai rerata kekasaran permukaan terendah adalah jenis coolant Dromus (4.061 µm), dan jenis coolant yang menghasilkan nilai rerata kekasaran permukaan tertinggi adalah Air (5.645 µm). Sudut (SCEA) yang ditentukan semakin besar, maka nilai kekasaran permukaan yang dihasilkan juga tinggi Nilai kekasaran permukaan terbaik diperoleh pada penggunaan jenis coolant Dromus dan besar variasi sudut Side Cutting Egde Angle sebesar 80 yang menghasilkan nilai Ra sebesar 3.200 µm. Kemudian untuk nilai kekasaran permukaan terendah adalah pada penggunaan jenis coolant Air dan besar variasi sudut Side Cutting Egde Angle sebesar 180 yang menghasilkan nilai Ra sebesar 7.311 µm.
PHYSICAL CHARACTERISTICS AND MAGNETIC PROPERTIES OF BAFE12O19/SRTIO3 BASED COMPOSITES DERIVED FROM MECHANICAL ALLOYING Widodo, Rahmat Doni; Manaf, Azwar
Sainteknol : Jurnal Sains dan Teknologi Vol 14, No 2 (2016): December 2016
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v14i2.8994

Abstract

Barium hexaferrite and strontium titanate are well established permanent magnet and piezoelectric materials which are technologically and scientifically attractive due to their potential for various applications in the field of magnetic electronics functional materials. However, the material properties for both require a careful control of grain structure as well as microstructure design to meet a specific application. In this work, we report some results of materials characterization especially particles and grains which were promoted during mechanical milling of a BaFe12O19/SrTiO3 composite system. These are including mean particle size characterization by Particle Size Analyzer and mean grain size determination by means of line broadenning analysis employing a step scanning counting in XRD apparatus for composite powders at various milling time up to 60 hours. It was found that the particle size of composite powders initially increased due to laminated layers formation of a composite and then decreased to an asymptotic value of ~8 μm as the milling time extended even to a relatively longer time. However, based on results of line broadening analysis the mean grain size of the particles was found in the nanometer scale. We thus believed that mechanical blending and milling of mixture components for the composite materials has promoted heterogeneous nucleation and only after successive sintering at 1100 oC the milled powder transformed into particles of nanograin. In thireport, microstructure as well as magnetic properties for the composite is also briefly discussed.
PEMANFAATAN TEKNOLOGI INFRARED THERMOGRAPHY UNTUK DETEKSI DINI KEGAGALAN ISOLASI JARINGAN KABEL LISTRIK UNNES Kartono, Kartono; Suryanto, Agus; Apriyanto, Eko Bagus
Sainteknol : Jurnal Sains dan Teknologi Vol 15, No 2 (2017): Desember 2017
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v15i2.12046

Abstract

Various phenomena in the maintenance of electricity network things that need to be anticipated include fluctuations in load, vibration, metal damage, extreme environments such as high temperatures, wind, or chemicals. Even dirt or dust in the air can also increase the rate of damage and amount of damage in the power grid. To address these problems, maintenance strategies based on monitoring the condition of an equipment are implemented. Various conditions can be monitored for example vibration / vibration, temperature, performance, chemical condition, and others. One of the practical techniques that will be discussed in this paper is thermography techniques using infrared cameras. Objectives to be gained through this research are: 1) Establish appropriate strategy for maintenance of power grid with application of infrared thermography detection technology, 2) to know the temperature change level that happened at power grid when infrared thermography detection technology applied, 3) Preventive action of temperature monitoring results on the electrical grid after the results of Intrautromal Thermography detection analysis. Stages This research was conducted by infrared thermography method that is shooting with infrared camera on power line which is operating produce a temperature pattern on surface of an object. Equipment that decreased performance will produce an anomaly phenomenon. Through certain interpretations, the heat source that produces such temperature deviation patterns can be traced. By knowing the cause of temperature deviation as early as possible, repair or maintenance of an electrical component can be done long before the component fails. Thus the failure of components or even accidents that may arise can be prevented. The conclusions that can be in this research are as follows: 1) Based on the results of research that have been done the average working temperature of electrical equipment in the panel panel phase experience abnormal, which indicates that the condition of the equipment is not in the best condition, so need to be followed up with 2) By using infrared thermography technology the initial inspection process of maintenance becomes more effective and efficient in terms of time and cost, as well as the use of thermography technology in the maintenance of electricity networks is also quite practical and easy.
RANCANG BANGUN MESIN PENGADUK MENTEGA (CHURNER) DENGAN SPEED CONTROL Pamungkas, Septyayu Catur; Pramono, Pramono; Sunyoto, Sunyoto
Sainteknol : Jurnal Sains dan Teknologi Vol 15, No 1 (2017): Juni 2017
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v15i1.9959

Abstract

Penelitian ini dilaksanakan guna mengetahui perencanaan konstruksi dan perhitungan komponen mesin churner, mengetahui produktivitas mesin churner, mengetahui kualitas mentega yang dihasilkan, serta mengetahui kecepatan yang optimal untuk membuat mentega. Metode yang digunakan dalam perancangan ini ialah metode Pahl & Beitz dengan tahapan penjabaran tugas atau spesifikasi, perancangan konsep, perancangan wujud, dan perancangan secara terperinci. Perancangan konstruksi mesin, produktifitas mesin, kualitas mentega, dan kecepatan pengadukan yang dihasilkan merupakan objek penelitian yang hasilnya akan dideskripsikan secara jelas. Penelitian ini menghasilkan mesin churner horisontal berdimensi panjang 790 mm, lebar 350 mm, dan tinggi 500 mm yang dibuat dengan bahan stainless steel 304 tebal 1 mm. Mesin ini berkapasitas 40 liter dan berkecepatan 50 – 175 rpm yang digerakkan oleh motor AC 0,5 HP. Pengaduk yang digunakan ialah flat blade pitch paddle berdiameter 210 mm, lebar 42 mm, dan poros 10,98 mm.  Produktivitas mesin pengaduk mentega dengan kecepatan 50 rpm ialah 4,660 kg/jam dengan kualitaas warna putih gading, rasa khas mentega, beraroma khas mentega, tekstur lembut, dan tahan lebih dari satu bulan. Pada kecepatan 100 rpm produktivitasnya ialah 5,035 kg/jam dengan kualitas warna putih gading, rasa khas mentega, beraroma khas mentega, tekstur lembut, dan tahan lebih dari satu bulan. Pada pengadukan dengan kecepatan 175 rpm memiliki produktivitas 4,050 kg/jam dengan kualitas warna putih gading, rasa khas mentega, beraroma khas mentega, tekstur lembut lengket, dan tahan dua minggu. Dari penelitian ini diketahui bahwa kecepatan optimal dalam mengaduk mentega ialah 100 rpm karena produktivitas yang dicapai tertinggi yaitu 5,035 kg/jam dengan kualitas warna putih gading, rasa khas mentega, beraroma khas mentega, tekstur lembut, dan tahan lebih dari satu bulan.

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