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Simetris
Published by Sekolah Tinggi Teknologi Ronggolawe Cepu
ISSN : 16937066     EISSN : 2686312X     DOI : https://doi.org/10.51901/simetris.v14i2.124
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Industrial & Manufacturing Engineering Mechanical Engineering
SIMETRIS: The Journal of Technology and Applied Science is a scientific journal published regularly every six months, namely June and December. SIMETRIS: Journal of Technology and Science Accepts articles from various groups covering the study and application of theory, research results, interesting conceptual ideas in the fields of engineering and applied science. The editorial team will decide on the selection of articles to be published after receiving the results from the expert editing team. Authors will be given input from the expert editing team. SIMETRIS: Journal of Technology and Applied Science contains research articles or literature studies in Indonesian and English.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 8 Documents
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Search results for , issue "Vol 15 No 2 (2021): Simetris" : 8 Documents clear
KAJI EKSPERIMENTAL PENGARUH PUTARAN PENGADUKAN TERHADAP KUALITAS BIODIESEL YANG DIHASILKAN DARI MINYAK JELANTAH drajat indah mawarni
SIMETRIS Vol 15 No 2 (2021): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v15i2.192

Abstract

Biodiesel is diesel engine fuel in the form of triglyceride compounds derived from biological resources in the form of vegetable fat oils and animal fats. Making this biodiesel using used cooking oil from food frying with KOH base catalyst and variations of stirring rotation 200, 300, 400 rpm. The transesterification reaction was initiated by heating used cooking oil with methanol and KOH catalyst at a temperature of 55C and various stirring cycles were carried out. The test was carried out at the Laboratory of Heat and Mass Transfer, Gajah Mada University, Yogyakarta. The purpose of this research is to make diesel engine fuel, to get the best stirring cycle used in the manufacture of biodiesel and to determine the quality of biodiesel, including Density Value, Viscosity, Calorific Value, Pour Point, Flash Point, Fog Point. Based on the tests carried out, it can be concluded that the best stirring rotation at 400 rpm is getting a Density Value of 891.9 kg/m3, a viscosity value of 5.2 cSt, and a 200 rpm getting the best Calorific Value 15.505 Btu/lb, a Pour Point Value of 12.33oC, a Cloud Point Value of 5.5 C and Flash Point Value 168.6oC
Aplikasi Metode Aktivasi Secara Kimia dan Fisika, Pada Zeolit Alam Sebagai Penejrap Logam Dalam Proses Pemurnian Air Puput Eka Suryani
SIMETRIS Vol 15 No 2 (2021): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v15i2.202

Abstract

Based on the method of formation, zeolites can be divided into two types, namely natural zeolites and artificial zeolites. Natural zeolites are zeolites that are formed naturally due to natural changes or from volcanic rocks due to volcanic eruptions. Natural zeolite can be applied as an adsorption system after the activation process. Activation of natural zeolite can be done in several ways, namely by acid washing method, which is then referred to as chemical activation. In addition, hydrothermal treatment can also be used as an activation method for zeolite preparation. The hydrothermal method is a high temperature heating method to remove water content as well as impurities in the zeolite. In this study, chemical and physical activation processes will be carried out to increase the crystallinity of the zeolite. In its application, the zeolite adsorption process will be carried out on water samples. From the XRD data, the treatment or physical modification of natural zeolite was able to increase the crystallinity significantly. Prior to the modification of the XRD data at an angle measurement of 2θ : 10-90 deg, the peaks were quite sharp. The percentage result shows that the sample before the modification reached 81.87%. Washing with distilled water has been able to increase the level of crystallinity which is quite significant. In the modified zeolite with the same analysis, the percentage of crystallinity was 99.24%.
IMPLEMENTASI ALGORITMA C4.5 UNTUK PENENTUAN PENERIMAN BEASISWA (Studi Kasus: SMA N 2 Cepu) retno wahyusari
SIMETRIS Vol 15 No 2 (2021): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v15i2.209

Abstract

One of human rights is the right to education. In organizing quality education requires substantial costs. Scholarships are a way to overcome cost problems for those who are less well off. Scholarships are assistance from the government of the private sector in the form of a sum of money given to students who are currently or who will attend school education. The granting of this sholarships is very important, in order to give students peace of mind in attending teaching and learning. Because many students apply for scholarships and too many indicators result in receivi9ng scholarships that are not well targeted. To overcome this problem, a scholarships acceptance Decision Support System was created using the C4.5 Algorithm which will make it easier for the 2 Cepu High School selection team to select students who are entitled to scholarships because in High School 2 Cepu the selection proses still uses manual methods and requires a long time. C4.5 Algorithm is a development of the ID3 Algorithm based on Supervised Learning. By using the Decision Tree method C4.5 Algorithm it is hoped that the awarding of scholarships can be right on target. In this study the researchers used class 11 and class 12 as training data to determine the decision tree in RapidMiner, while class 10 data became the testing data for the matlab proses. There are 99 students in grades 11 and 12 who are eligible for scholarships, while 402 grade 11 and 12 students who do not deseve a scholarship. The results of the decision tree support system research with the decision tree method for the recommendation of students to be eligibel or not to receive sholarships using the C4.5 arlgorithm can prosuce a high level of accuracy that is equal to 96,80%.
SISTEM INFORMASI PROGRAM KERJA PEMBERDAYAAN DAN KESEJAHTERAAN KELUARGA (PKK) Di Desa Cabean, Kecamatan Cepu, Kabupaten Blora Joko Handoyo; Joko Handoyo
SIMETRIS Vol 15 No 2 (2021): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v15i2.212

Abstract

PKK (Empowerment and Family Welfare) is a national movement in community development that grows from below, where the management is carried out by the surrounding community for mutual welfare. There are 4 working groups in the Cabean Village PKK program, namely: PokJa 1 includes: (religious, social, mutual cooperation), PokJa 2 includes: (UP2K, UPPKS, BKB, BKR, BKL), PokJa 3 includes: (clothing, food, yard land use), and PokJa 4 include: (health, posyandu, posbindu). In the PKK administration process in Cabean Village, they still use manual methods both in recording data and conducting data recapitulation. This causes several problems that often become obstacles in the PKK administration process in Cabean Village. The purpose of this research is to build an information system for PKK work programs that are expected to be able to solve problems related to the quality of information, in the form of: the availability of information in computerized form so that it can be obtained quickly. From the data taken from the Cabean Village PKK, which includes: membership data, work program data, training activity data, and annual report data. The information system design is modeled into diagrams in the UML (Unified Modeling Language) and the System Development Life Cycle (SDLC) development method with the Waterfall model. SDLC means creating a new system to replace the old system as a whole or improve an existing system to be structured. From the results of the functionality test, it was obtained 93,3% of the average feasibility of the test so that it was feasible to be used or applied to the information system. The Information System for the Work Program for Empowerment and Family Welfare (PKK) in Cabean Village has succeeded in inputting 20 records and the stages of work carried out by the information system analysis and programmers in building the information system.
Miskonsepsi Mahasiswa Menggunakan Four-Tier Diagnostic Test Ratna Dwi Rahayu
SIMETRIS Vol 15 No 2 (2021): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v15i2.223

Abstract

In physics learning, it is not uncommon to find misconceptions experienced by students, including the Dynamic Fluids sub-material, namely the Principle of Continuity. This study aims to identify misconceptions that occur in the Continuity Principle teaching material and identify concept weaknesses as the cause of the Continuity Principles teaching material and identify conceptual weaknesses as the cause of these misconceptions. The study was conducted on 37 students at Seolah Tinggi Tenologi Ronggolawe majoring in Mechanical Engineering with one shoot research method. Diagnosis of student misconceptions is carried out using a four-tier diagnostic test instrument which is the development of a three-tier test instrument by adding the level of confidence in the answers to the third tier. The results of the diagnosis show that students experience misconceptions in the Continuity Principles sub-material by 28%, students who understand partly 35%, students who understand concepts only 6%, students who do not understand concepts by 30% and students who cannot be coded 0%. Based on the results of observations in learning and analysis of the answers to the third and fourth tiers, the misconceptions that occur are generally caused by students' inaccurate logic, namely students assume that a fluid with a high velocity has a large fluid pressure, and vice versa.
PERANCANGAN BANGKU PENDEK (DINGKLIK) BERBAHAN PLASTIK DENGAN BANTUAN SIMULASI CAD/CAE Joko Waluyo
SIMETRIS Vol 15 No 2 (2021): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v15i2.224

Abstract

Injection Molding is a thermoplastic material processing method in which the material that melts due to heating is injected by a plunger into the mold and then cooled until the material is solid, and removed from the mold. The purpose of this design is to determine the maximum load that can be accepted by the short bench (Dingklik), and to design the dimensions of the bench, while the design stages are as follows: starting from the design of the bench using CAD/CAE software, and machining simulation using can CAM software. Data input simulation is performed using the CAM software engine. The maximum weight of the respondent is 95 kg, and the load chosen to be safe in this design is 190 Kg (1862,9 N) The results of the design of the bench obtained the following data: length 350 mm, width 250 mm and height 180 mm, the material used is Polypropylene, the surface area of the object is 409923 mm2, the total volume with the gatting system is 776493,9461 mm3, and the maximum load that the material can withsatand is 2551.3995 Newtons.
Analisis Keamanan Aplikasi Android Non Playstore Dengan Metode Digital Forensik Pendekatan Statis Dan Dinamis Indra Gunawan
SIMETRIS Vol 15 No 2 (2021): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v15i2.225

Abstract

The crime of cyberspace every year has increased, one of which is a data leak. The non-playstore Android application is not guaranteed its security because the application system only has access to special directories, and this is what complicates the installation process of non-playstore application users. In this study the author conducted a security analysis with 5 non-playstore applications with a static and dynamic approach, after experimenting using Wireshark and Network Miner software with the process of the process of the method of the method of the National Institute of Justice (NIJ) which was divided into five stages, namely identification, collection, collection, Collection Examination, Analysis, and Reporting have received evidence that the non-playstore application is suspected not guarantee user data security. In this monitored application which will later obtain digital proof of safe or whether or not Android applications from the threat level of crime by using a static method to dismantle the application and dynamic programs used to see the data security exposed whether there is a virus in the application and other data leaks. From this analysis it can be obtained by experimental results using Sofwere Wireshark and Network Miner to be analyzed. This study aims to analyze the vulnerability level of applications sourced from non-playstore with a threat level. The results obtained from the 5 applications are monitored, it is known that the MICHAT Lite and BIGO LIVE application has an extreme risk with 45% points, on the Rolling Scroll application, Flying Sketchboard is known to high risk high risk with 25% point, while the Car Engine crash application has a security level Moderate risk with a risk that is 20%. The conclusion of this study is that applications installed from third parties have a higher level of threat when compared to the official application on the Playstore
A Pengaruh Kekerasan Benda Kerja Terhadap Getaran Bentuk Geram dan Kekasaran Permukaan pada Proses Bubut Mudjijanto Mudjijanto
SIMETRIS Vol 15 No 2 (2021): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Kekasaran permukaan menjadi salah satu parameter dalam menentukan kualitas produk hasil proses pemesinan. Faktor-faktor yang dapat mempengaruhi tingkat kekasaran permukaan salah satunya adalah material, sementara Geram merupakan barang sisa hasil proses pemesinan, yang keberadaanya sering kita sebut sebagai sampah. Bentuk dan geometri geram sangat beragam dan hal ini bergantung pada parameter proses pemesinan, tool dan jenis material. Penggunaan material di masyarakat sangatlah beragam, tentunya sesuai kebutuhan. Beberapa material diantaranya baja karbon menengah, baja paduan dan baja perkakas, kualitas mesin baja-baja tersebut tentu akan menjadi rujukan enginner dalam menentukan kualitas saat di mesin. Karakterisasi bentuk geram dibutuhkan sebagai upaya pendekatan kontrol kualitas terhadap material pada proses cutting terutama mesin bubut. Metode penelitian ini menggunakan jenis pahat finishing. Dalam penelitian ini akan dilakukan analisis kekasaran permukaan, bentuk geram serta getaran yang ditimbulkan dari proses pemesinan bubut. Hasil eksperimen yang didapat dari penelitian ini adalah semakin meningkatnya kedalaman pemakanan (depth of cut) akan menghasilkan peningkatan getaran dan akan menghasilakan peningkatan kekasaran permukaan, semakin keras material akan menghasilkan peningkatan getaran dan akan menghasilkan meningkatkan kekasaran permukaan kecuali untuk material AISI D2 kekasaran permukaan paling tinggi hal ini di karenakan material AISI D2 dalam pengerjaan dingin mengalami regangan yang besar dan semakin besar depth of cut akan menghasilkan bentuk geram yang kontinyu dengan diameter yang semakin kecil dan semakin keras material akan menghasilkan bentuk arc chips

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