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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 148 Documents
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INSTALASI UNIT BIOGAS DARI LIMBAH KOTORAN SAPI DENGAN METODE ANAEROB MENGGUNAKAN REAKTOR VOLUME 3300 L puput eka suryani; suluh jatmiko; arya dwi candra
SIMETRIS Vol 12 No 2 (2018): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

Medalem is one of the villages located in Kradenan District, Blora Regency,Central Java. Most of the residents of Kradenan have a livelihood as Farmers, includingresidents of Medalem Village. In addition to farming, residents also conduct cattle and goatbreeding activities, this is due to very supportive natural conditions. Medalem Village,especially Sunggun Hamlet, gets a grant in the form of cattle from the local government tobe managed by each farmer group in Sunggun Hamlet. Until now the number of cowsmanaged by farmer groups has reached 28. Several cows maintained in one places or inresidents in their own homes. There are some disadvantage caused by the amount of cowdung produced by these cows, ranging from unpleasant odors, trees and plants that diefrom piles of cow dung, to the dwindling landfill of cow dung. This research aims toprovide appropriate solutions to overcome these problems. The activities carried out are bybuilding the installation of biogas units in Sunggun Hamlet. This biogas processingtechnique uses a cylinder reactor (floating drum). Some of the results of the activities thathave been carried out are more integrated processing of cow manure, no land wasted toaccumulate cow dung, improved soil and air health quality, availability of new LPGreplacement fuel, availability of organic fertilizer that can be directly applied to crops,availability of waste solid that can be used as a planting medium.
Analisis Peningkatan Mutu Agregat Halus Pasir Demak sebagai Bahan Campuran Beton Normal K250 Dwi Agus Rudyanto; Masrur Masrur
SIMETRIS Vol 12 No 2 (2018): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

Fine aggregate (natural sand) commonly contains a lot of mud and is fine and round shaped which is generated from a friction process making the stickiness of the granules of which is inadequate. In order to gain a good material, washing is required or we have to mix several kinds of aggregate so as to obtain the desired result. The objectives of this study are finding out the the quality of Demak’s fine aggregate, the quality of the concrete produced, the method of enhancing the quality of the Demak’s fine aggregate, the quality of the concrete that uses the enhanced fine aggregate, the comparison between the quality of the fine aggregate prior to and post quality , enhancement and the quality comparison of the produced concrete. Demak’s fine aggregate has a 8.18 % mud content, a 43.53 % water absorbency and fineness modulus ( granule fine modulus) of 2.44. The concrete that uses the Demak’s fine aggregate has the average pressure strength of 94.61 kg/cm2, modulus of rupture of 10,96 kg/cm2 , and splitting test of 30.66 kg/cm2. The Demak’s fine aggregate after being washed has a mud content of 7.46 %, water content and water absorbency of 15.38 % and FM of 2.67. The concrete that uses washed Demak’s fine aggregate has the average pressure strength of 102.06 kg/cm2, modulus of rupture of 12,02 kg/cm2, and splitting test of 33.33 kg/cm2. The fine aggregate of mixture of 50 % washed Demak’s fine aggregate and 50 % stone dust has the mud content of 6.25 %, water content and water absorbency of 8.24 % and FM of 3.24. The concrete that uses the mixture of 50 % washed Demak’s fine aggregate and 50 % stone dust has the average pressure strength of 138 kg/cm2, modulus of rupture of 16.98 kg/cm2, and splitting test of 44.88 kg/cm2. The highest quality enhancement of concrete for average pressure strength converted into the age of 28 days is 45.88 % on the concrete with the material of which is a mixture of 50 % washed Demak’s fine aggregate and 50% stone dust against the concrete with material of which is Demak’s fine aggregate.
Rancang Bangun Data Logger Temperatur Agus Dwi Korawan
SIMETRIS Vol 12 No 2 (2018): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

Temperature data logger is a portable measurement instrument used for reading the temperature of an object and storing the results of temperature in the form of data. Temperature data logger consists of NTC 7.5 K probe thermocouple with serial number SSR038 (16 pieces), the arduino mega microcontroller atmega 2560, and the card data logger module SC-MMC with serial number MOD009. The software used is Arduino 1.5.7 windows based. Testing of 16 thermocouples is done by dipping the thermocouple in water with an initial temperature of about 27oC, then the water is heated slowly for 650 seconds. The results show the same chart pattern, even though there is a slight difference in value. Maximum deviation is 1.0oC. The temperature which is displayed on the monitor screen and stored on the SD card is the same.
PENGEMBANGAN SISTEM INFORMASI PERPUSTAKAAN MENGGUNAKAN JAVA NETBEANS IDE (Studi Kasus : SMK NU Wado Kedungtuban) Umi Rosidah; Adhika Pramita Widyassari
SIMETRIS Vol 12 No 2 (2018): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

Service and management of SMK NU Wado Kedungtuban library data still uses the manual method by recording member data, borrowing, repaying and reporting still using books as a medium for recording loan transactions so that it is less effective and efficient. The purpose of research is the design, development and implementation of library information systems to help the process of library service management and data implementation using Java NetBeans IDE-based information systems. The design of the information system is modeled into diagrams in UML (Unified Modeling Language) and the method of developing the System Development Life Cycle (SDLC) with the Waterfall model. This Mobile Based Library Information System Research is expected to help library staff in the process of managing library data, as well as assist students in the process of finding books so that it is easier.
SIMULASI KARAKTERISTIK POLA ALIRAN DUA FASE (AIR – UDARA) PADA RANGKAIAN PIPA VERTIKAL, ELBOW 45o DILANJUTKAN PIPA MIRING MENGGUNAKAN ANSYS FLUENT 16.0 ika uliyatin nikmah; Agus Dwi Korawan
SIMETRIS Vol 12 No 2 (2018): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

A two-phase flow is part of a multi-phase flow. A two-phase flow is defined as a fluid flow consisting of substances of different phases that flow simultaneously in one channel. The two-phases flow has a very complex phenomenon, this is due to interactions between phases, their geometry and orientation (vertical or horizontal). To find out the phenomenon, a numerical study of two-phase flow (water-air) was carried out on a series of vertical pipes, 45o elbow and sloped pipes, which varied in this study was the superficial gas velocity (USG) of 0.031 m/s, 0.068 m/s, 0.109 m/s and 0.157 m/s. Research using Ansys Fluent 16.0 software. The pipe used is a transparent pipe with a diameter of 32 mm and a length of 3000 mm, the elbow used is the elbow 45o. Research using Ansys Fluent 16.0 software. The pipe used is a transparent pipe with a diameter of 32 mm and a length of 3000 mm, the elbow used is the elbow 45o. The results of this study indicate that at superficial air velocity (USG) of 0.031 m / s and 0.068 m / s the flow pattern is a combination of annular flow, slug and slight bubble. Whereas at superficial air velocity (USG) 0.109 m / s and 0.157 m / s flow patterns are annular flow and slug.
SISTEM INFORMASI PENERIMAAN SISWA BARU MENGGUNAKAN JAVA NETBEANS DAN DB MYSQL (Studi Kasus: MI AT– TAQWA Kedungtuban) tiodora irnariyanti; Adhika Pramita Widyassari
SIMETRIS Vol 12 No 2 (2018): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

Registration and Admission of new students in MI AT-TAQWA Kedungtuban still uses the manual method in the form of filling in the registration form first and then moved to the ledger, slowing down time and writing errors often occur during the process of recording in the ledger. In addition, there are also often obstacles when the registrant form slips when it is submitted to the ledger. These constraints will cause the PSB committee to feel difficulties when inputting new students. The purpose of research, design, development, and the process of applying new student admissions using a Java NetBeans IDE-based information system. The design of information systems is modeled into diagrams in UML (Unified Modeling Language) and the method of developing the System Development Life Cycle (SDLC) with the Waterfall model. The test results of the New Student Admission Information System obtained 96% of the Interface tested well. The research data was taken from MI AT-TAQWA Kedungtuban in 2019/2020. This research can help the school to make maximum and accelerate registration and acceptance of new students to the maximum.
Implementasi Fuzzy Mamdani dalam Sistem Pendukung Keputusan Pemilihan Kamera DSLR bagi Pemula Inayatul Mu’amalah; Arlinda Meydiana
SIMETRIS Vol 13 No 1 (2019): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

Fuzzy logic is a method for mapping input to output. Fuzzy logic is used to support decision making. This method consists of three main processes, namely fuzzification, fuzzy inferential, and defuzzification. The results of this process depend on fuzzy compilation limits, fuzzy variables and non-fuzzy variables. The number of Digital Single Lens Reflex (DSLR) series that are developing at this time with diverse specifications makes it difficult for people to make a choice when buying a DSLR camera. Everyone has criteria that are considered according to their individual needs. In principle, the existence of SPK, only as a decision support system, not replace it. Including, making decisions in the selection of a product. The results of the implementation of the fuzzy method in the case of the selection of DSLR cameras tested in 10 data using Matlab are the highest value printed on the type of Canon EOS camera with the output output = 72.6 and the camera that is not recommended is located on the type of Canon EOS 700D camera with the output output = 17.1 .
Proses Milling CNC Sinumeric 808D pada Material Acrylic untuk Mendapatkan Kualitas Permukaan yang Optimum dengan Menggunakan Parameter Tebal Pemakanan, Voeding dan Kecepatan Potong Harun Satria; Joko Waluyo
SIMETRIS Vol 13 No 2 (2019): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

The value of a product can be indicated by one of them is surface quality. The machining process has different fineness (roughness value), especially in CNC Milling machines. This study aims to determine the variability of tool path, Spindle Speed, and Feed Rate on flat surfaces machined CNC Milliing Sinumerik 808D 3 Axis on Acrylic material, on the surface roughness produced in units (Ra) which results are good. The machining process of acrylic materials using CNC Milling machines is carried out at the Campus CNC Laboratory of the Akprind Institute of Science & Technology in Yogyakarta. Surface roughness testing was carried out at the Engineering Materials Laboratory, Department of Mechanical Engineering, Gadjah Mada University using the Surface SE 1700 roughness test equipment and material surfaces observed using a 200x magnification metal microscope. The machine parameters that are set are the spindle speed of 1000, 1500, 2000 rpm, Feed Rate 400, 800 mm / min and use the zigzag & one way tool path. The conclusion obtained is that at 1000 rpm spindle rotation, one way feed flow, 800 mm / minute feeding speed gets the highest roughness of 15.78 μm. While the spindle rotation of 2000 rpm feeding speed of 400 mm / min, and zig-zag tool flow get the lowest roughness value, the roughness value obtained is 7.074 μm. Then the CNC Milling Machining Process on Acrylic material if you want to have good roughness the parameters must be high rotating speed and low Feedrate using a one way toolpad.
Studi Eksperimental Variasi Celah Katup Hisap dan Katup Buang Terhadap Performance Speda Motor 4 Langkah Menggunakan Bahan Bakar Biopremium E10 sarjono sarjono
SIMETRIS Vol 12 No 1 (2018): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

Research has been conducted on experimental studies of the slit Valve's variation in suction valves and exhaust valves against Performance Speda Motor 4 step using the fuel Biopremium E10. The study aims to figure out the performance of a four-step motor spec with a variation of suction valve gaps and exhaust valves using a Biopremium E10 alternative fuel. The results showed that with a suction valve gap of 0.08 mm and a exhaust valve gap of 0.11 mm in the round range of 6000 rpm, the resulting power and torque was the maximum of 9.2 HP and 11.04 Nm, as well as the use of specific fuel effective (SFC) The most economical of 0.0821 kg/kWh
Studi Eksperimental Penggunaan Bahan Bakar LPG Terhadap Emisi Gas Buang CO dan HC Pada Motor 4 Langkah sarjono sarjono
SIMETRIS Vol 12 No 2 (2018): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

The growing number of motorised vehicles, bringing out two serious threats: the first economic factor in the form of oil fuel that is getting longer is thinning. To the two factors of environmental pollution, which is the pollution caused by the combustion of oil fuel either directly in the form of harmful exhaust emissions such as CO, and HC and indirect pollution in the form of global warming Potential Caused by the amount of CO2. Therefore, it takes an environmentally friendly alternative energy as fuel, one of which is LPG fuel (Liquefied Petroleum Gas).The purpose of this research is to determine the influence of the use of LPG fuel against the exhaust gas emissions of CO, and HC on 4-Step Motors. The results showed that the use of LPG fuel on 4 Stroke Motors was able to reduce emissions of exhaust gas CO and HC. The lowest CO-rate occurred at a 1500 rpm round of 0.49% vol, while the highest HC at 1500 rpm was 358% Vol. While the lowest CO2 at the 1200 rpm rotation was 2.94% Vol. Specific fuel consumption (SFC) tends to be more efficient than Using premium fuel, because the use of LPG fuel provides the optimization of combustion. This is due to the fuel-air mixture that goes into the cylinder of the combustion chamber into a homogeneous mixture and causes perfect burning.

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