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Helmi Gunawan
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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 176 Documents
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Analisis Keamanan Aplikasi Chat Android Pihak Ketiga Atau Non Playstore Menggunakan Digital Forensics Indra Gunawan
SIMETRIS Vol 16 No 2 (2022): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v16i2.257

Abstract

Aplikasi pihak ketiga adalah aplikasi yang dibuat oleh pengembang bukan pembuat perangkat yang menjalankan aplikasi atau pemilik situs web yang menawarkannya. Tujuan penelitian ini adalah untuk mengetahui tingkat keamanan dari aplikasi chat GB WhatsApp, Telegram Mod, MiChat Mod, WeChat Mod, dan Line Mod. Analisis digital forensik ini menggunakan 2 metode yaitu statis dengan menggunakan Wireshark sebagai aplikasi perekam aktifitas kinerja jaringan dan dinamis dengan menggunakan Network Miner sebagai aplikasi untuk mengumpulkan data tentang lalu lintas pada jaringan. Hasil penelitian menggunakan metode statis menunjukkan bahwa kelima aplikasi memiliki izin hak akses yang berbahaya, sedangkan menggunakan metode dinamis menunjukkan bukti terdapat kebocoran data pada chat pribadi.
Analisis Tarikan Perjalanan dan Pola Sebaran Panjang Perjalanan ke Kawasan Pendidikan (Studi Kasus : Kawasan Pendidikan Jalan Gatot Subroto, Kabupaten Blora) Hartono Guntur Ristiyanto
SIMETRIS Vol 16 No 2 (2022): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v16i2.258

Abstract

The existence of schools on Gatot Subroto Street has potential impact to generate a number of trips. The area’s development must be balanced with the provision of adequate transportation. The first step that needs to be taken is to provide information regarding the characteristics of the attraction and distribution patterns of trips to the area in such a way that the demand for transportation can be anticipated. Therefore, the formulation of the research problem is: what are the characteristics of the attraction and the pattern of distribution of trips to the educational area of ​​Gatot Subroto Street, Blora Regency? While the purpose of the research is to analyze the attraction of trips and distribution patterns of trips to the area. Secondary data was obtained from the school and the Blora District Education Office, namely: teacher and employee population, student population, mode used, land area, building floor area, and parking area. Primary data was obtained from an interview survey via google form. The dependent variable is the number of trips and the independent variables: number of students, teachers & employees, land area, floor area, parking area. Based on the results of the analysis, trips attraction is strongly influenced by the population of travelers. The second variable that has a statistically significant effect is the size of the parking area. Most trips to this area have a range of 3-6 km. While the trip barrier function that best describes the trip distribution is the exponential function. The limitation of this research is that it is not yet known how the impact of Covid-19 has on travel attraction. The research results can be used as a basis for further research, namely the calibration of the transportation demand model. Zoning also needs to use village-based travel origin zones to obtain more accurate analysis results
Optimalisasi Pengolahan Limbah Kaleng Menggunakan Mesin Press Nidia Lestari
SIMETRIS Vol 16 No 2 (2022): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v16i2.260

Abstract

Currently, many scrap collectors are still pressing used beverage cans manually, which hinders their productivity. This research aims to produce an effective tool in the form of a Press Machine with a crankshaft system, where this machine is made with the aim of optimizing waste treatment, especially beverage can waste. With this machine, the pressing of used beverage cans with a can size of 6.2 cm in diameter, 11.5 cm in height with a volume of 320 ml can be compacted into a smaller (flat) shape with a final height of 2 cm so that it can be said that the press machine has been increasing the efficiency of transport volume and storage area to wait for the next process.
PENGARUH DAYA DUKUNG TANAH DASAR (SUBGRADE) TERHADAP TEBAL PERKERASAN FLEXIBLE PAVEMENT Hariyanto hariyanto; Bambang Supranoto
SIMETRIS Vol 16 No 2 (2022): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v16i2.261

Abstract

Tanah dasar merupakan bagian pertama yang perlu diperhatikan dalam perencanaan jalan raya.Daya dukung tanah dasar yang baik ikut mempengaruhi lapisan perkerasan di atasnya baik lapisan pondasi bawah (sub base), lapisan pondasi atas (base) dan lapisan permukaan . Kualitas tanah dasar yang akan menjadi tempat jalan raya di letakkan diukur dengan besarnya nilai CBR (California Bearing Ratio). Apabila kualitas daya dukung tanah dasar kurang memadai maka dilakukan perbaikan agar bisa tercapai kondisi yang memenuhi syarat minimumnya. Nilai minimum anka CBR yang disyaratkan harus lebih besar dari 6%. Perbaikan bisa dilakukan dengan cara mekanis maupun kimiawi. Secara mekanis yang umm dilakukan adalah pemadatan tanah, mencampur dengan tanah lain yang bergradasi berbeda atau menggantinya dengan tanah lain yang lebih baik. Perbaikan kimiawi bisa dilakukan dengan penambahan bahan tambah seperti kapur, semen, atau bahan kimia lain yang akan meningkatkan nilai CBR aslinya. Dalam analisa komponen Bina Marga untuk merencanakan perkerasan lentur (Flexible Pavement), untuk merencanakan lapisan perkerasannya masih memerlukan faktor yang berkaitan dengan jumlah lalu lintas, kondisi lingkungan (faktor regional) dan jenis bahan-bahan untuk membuat jalan yang bersangkutan. Dari data-data tersebut bisa dihitung indeks tebal perkerasan (ITP) yang menentukan nanti dimensi dari ketebalan masing-masing lapisan. Untuk mendapatkan ITP telah disediakan nomogram di dalam petunjuknya
Kaji Eksperimental Variasi Bentuk Injektor Udara Terhadap Pola Aliran Dan Debit Air pada Air-Lift Pump Drajat Indah Mawarni
SIMETRIS Vol 16 No 2 (2022): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v16i2.262

Abstract

Two-phase flow is two different fluid streams flowing in a pipe. Two-phase flows precipitate into gas-liquid, gas-solid, solid-liquid flows. Apart from the flowing fluid, two-phase flow is differentiated according to the direction of the vertical pipe and the direction of the horizontal pipe. The purpose of this study was to determine the pattern of flow and discharge in the air-lift pump through variations in the shape of the injector. This test was carried out with variations in the shape of the injector, namely the type of nozzle, tube and diffuser, using a test pipe with a vertical direction and a length of 500 mm with a diameter of 24 mm, using a water level of 450 mm with a superficial gas velocity of 0.07 m/s, 0.085 m/s , 0.10m/s. Of the injectors that have been carefully inspected, the nozzle-type injector with a superficial gas of 0.10 m/s produces the highest water discharge. While the lowest water discharge is found in the type of diffuser injector with superficial gas of 0.075 m/s. In observing the flow pattern of the injector nozzle the flow that occurs is (churn flow) but in each flow pattern there are several bubbles that appear. The flow patterns of tube injectors The flow patterns that occur are churn flow and annular flow. And in the diffuser injector, the flow pattern that occurs varies, namely churn flow and slug flow, the greater the superficial gas, the flow pattern changes to annular flow.
PENINGKATAN ARUS LISTRIK DAN TEGANGAN LISTRIK KELUARAN SEL SURYA DENGAN MENGGUNAKAN REFLEKTOR Ratna Dwi Rahayu
SIMETRIS Vol 16 No 2 (2022): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v16i2.269

Abstract

The output solar cells in the form of electric current and voltage as an alternative energy source can be increased by increasing the intensity of the light that falls on the surface of the solar cell. The intensity of light falling on the solar cell can be magnified by using a reflector. This article analyses in the magnitude of the electric current and voltage output of solar cells using a reflector in the form of a flat mirror at a mirror angle of 600 and a concave mirror with a focal length of 20 cm againt the output of a solar cell without a reflactor. The measurement results show that there ia a greater increase in output by using a flat mirror compared to using a concave mirror as a reflector. Increasing the magnitude of the electric current and output voltage of solar cells with a flat mirror as a reflector to the electric current and output voltage of solar cells without reflectors was 3,54 % and 29,28 %, respectively on the use of a concave mirror as a reflector of 1,7 % and 9,98 %.
Sistem Informasi Kegiatan Kuliah Kerja Lapangan (KKL) di Sekolah Tinggi Teknologi Ronggolawe (STTR) Cepu Menggunakan Desain Unified Modeling Language (UML) Muksan SAN Junaidi
SIMETRIS Vol 16 No 1 (2022): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v16i1.273

Abstract

KKL is an academic activity that must be taken and taken by all Diploma and Bachelor students in groups or individually. At the STTR Cepu campus, the process of submitting KKL to the assessment is still done manually, so it takes quite a long time to search for student data, missing data and inconsistent KKL activity data. The purpose of this research is to design and develop an Information System for Online KKL Activities at the STTR Cepu campus. Using the waterfall model system development life cycle (SDLC) development method, design based on Unified Modeling Language (UML) and PHP programming language with MySQL database. The research data includes student MPA data for the last 3 years 2015-2018. The results of this study are the application of an KKL activity information system that helps make it easier for students in the process of registering activities, submitting activities and proposing guidance processes and reports on the results of KKL activities as well as being more time efficient and faster..
Sistem Informasi Cuci Mobil Berbasis Web dengan Metode SDLC Widyassari, Adhika Pramita; Gajendra, Ibran; Febrianto, Ervian
SIMETRIS Vol 17 No 1 (2023): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v17i1.308

Abstract

Penelitian ini dibuat dengan tujuan membangun sebuah aplikasi atau sistem informasi kasir bagi usaha cuci mobil, untuk mempermudah proses pengelolaan data transaksi dan menghitung total pengeluaran bahan yang diperlukan per bulannya, sehingga karyawan dapat dengan mudah menemukan data yang diperlukan dengan cepat tanpa mencari dalam buku yang akan memperlambat kinerja. Perancangan sistem informasi ini menggunakan bahasa pemrograman PHP. PHP rad dan Xampp server versi 5.1.6. Berdasarkan hasil pengujian, diperoleh bahwa 88,8% sistem informasi ini dapat berjalan dengan baik dan mempermudah penggunanya.
PENGARUH SUDUT SUDU TERHADAP PUTARAN TURBIN ANGIN SAVONIUS TIPE-L Riyadi, Mochamat Slamet
SIMETRIS Vol 17 No 1 (2023): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v17i1.310

Abstract

Penggunaan energi angin sebagai energi alternatif pengganti bahan bakar minyak untuk penggerak turbin sudah banyak dilakukan oleh para peneliti, hal ini karena energi angin tidak menimbulkan limbah udara. Kecepatan angin di Indonesia berkisar antara 2 m/s sampai dengan 3 m/s, ini cocok untuk menggerakkan turbin angin Savonius yang merupakan turbin angin sumbu vertikal. Pada penelitian ini menggunakan turbin angin savonius tipe-L. dilakukan dengan memvariasikan sudut sudu sebesar 100,120 dan 140°. Penelitian dilakukan secara eksperiment laboratorium, kecepatan angin divariasikan pada 3, 4, 5, dan 6 m/s. Tujuan penelitian untuk mengetahui pengaruh sudut sudu terhadap putaran. Hasilnya menunjukkan bahwa semakin besar sudut sudu turbin mengakibatkan semakin besar putaran poros turbin, semakin besar kecepatan angin mengakibatkan semakin besar pula putaran turbin.
Analisis Tegangan Pada Rangka Mobil Off Road Menggunakan Metode Elemen Hingga Dengan Software SolidWorks Suryanto, Hendri; Herraprastanti, Eva Hertnacahyani
SIMETRIS Vol 17 No 1 (2023): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v17i1.317

Abstract

The chassis is the main part of a vehicle that functions to hold all components and passengers and must be able to withstand the loads that occur without experiencing excessive deflection or deformation. Off-road cars are designed to be able to pass on unpaved roads or terrain or rocky surfaces. With such terrain, it will put an excessive burden on the car, especially on the frame. The frame will be subjected to greater bending and torsional loads if the car is used on an uneven surface. For that we need a frame that is strong and rigid so that it is safe for the driver and other car components. In this study, an analysis of the stress that occurs on the frame of the TM D3 Off-Road Car was carried out to determine its strength. The analysis was carried out numerically using the finite element method using SolidWorks software. The results of the analysis show that under a static load of 3000 N, the frame is still in a safe condition because the stress that occurs in the frame is below the yield stress value of the material used, while at a torsional loading of 500 N.m, the frame is in an unsafe condition because the stress that occurs exceeds the value the yield stress of the material used. After modifying the frame, the simulation results with 500 N.m torsional loading show that the stress that occurs in the frame is in a safe condition.

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