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<![CDATA[Kajian Dampak Tata Guna Lahan terhadap Kinerja dan Biaya Tundaan Simpang (Studi Kasus : Simpang Tiga Jl. GOR – Jl. A. Yani, Kota Blora) ]]>
<![CDATA[Hartono Guntur Ristiyanto]]>
<![CDATA[ SIMETRIS Vol 15 No 1 (2021): SIMETRIS ]]>
Publisher : <![CDATA[Sekolah Tinggi Teknologi Ronggolawe Cepu ]]>
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DOI: 10.51901/simetris.v15i01.153
<![CDATA[The current land use have made the corridor of Jalan GOR in Blora Regency plays an important role in the aspect of transport demand. The area’s development must be balanced with the adequate transport supply in such a way that it will minimize the negative impact due to the imbalance between demand and transport supply. One of the existing transport supply is an unsignalized intersection at the eastern end of the corridor. The potential problem due to the existence of nearby land uses, such as gas stations, on intersection performance is : the presence of delays. Based on those research backgrounds, the formulation of the research problem is: how does the existence of gas station affect the intersection performance and the cost of delay? This research aims to analyze the performance of intersections due to the existence of gas stations. The results of the analysis show that the existence of gas station gives various contribution to intersection performance parameters. Respectively, the biggest effect occurred on the increase in vehicle volume, degree of saturation, and total delay (especially traffic delay). Overall, the existence of a gas station has no effect on the level of service’s value of the intersection. Meanwhile, the value of the highest delay costs occurs during the peak hours of the day. The predicted intersection performance without any geometric improvement for 5 years will begin to decline in third year. Meanwhile, if the intersection is widened, it will begin to decline in the fourth year. However, this geometric improvement has only a very small effect on intersection performance.]]>
<![CDATA[Pengaruh Variasi Kecepatan Aliran Udara Terhadap Karakteristik Pembakaran Briket Arang Daun Jati (Tectona Grandis L.F) ]]>
<![CDATA[sarjono sarjono sarjono]]>;
<![CDATA[Agus widiyanto]]>
<![CDATA[ SIMETRIS Vol 15 No 1 (2021): SIMETRIS ]]>
Publisher : <![CDATA[Sekolah Tinggi Teknologi Ronggolawe Cepu ]]>
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DOI: 10.51901/simetris.v15i1.154
<![CDATA[The potential of biomass teak leaves as an alternative source of energy is so abundant, but not yet fully realized. Teak leaf is one type of biomass that can be used as an alternative fuel. The objective of this research is to determine the influence of pressure variation on the combustion characteristics of teak biobriket charcoal. Testing carried out with a variation of pressing pressure of 350 psi, 600 psi, 850 psi, 1100 psi and 1350 psi. The test results of the influence of pressure variations on the presses against the combustion characteristics of teak charcoal briquettes show that biobriket with lower dipbriglutinous pressure has the highest combustion rate of 0.0928 grams/second. The combustion temperature rate reaches 486.4 ° C and the lowest temperature is 384.3 °c. Mass reduction will be quicker if the temperature of the air flowing into the fuel chamber is higher. The decrease in mass will be faster if airflow speed is raised. Low glutinous pressure causes the fuel to be shorter in its burning time.]]>
<![CDATA[SISTEM PENGOLAHAN NILAI UNTUK KURIKULUM PAUD BERBASIS DESKTOP DENGAN MODEL WATERFALL ]]>
<![CDATA[Muksan SAN Junaidi]]>
<![CDATA[ SIMETRIS Vol 15 No 1 (2021): SIMETRIS ]]>
Publisher : <![CDATA[Sekolah Tinggi Teknologi Ronggolawe Cepu ]]>
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DOI: 10.51901/simetris.v15i01.156
<![CDATA[The data processing of Al-Amin's Play Group student scores is still done manually, namely by handwriting on student assessment booksheets, this takes a long time and is not effective. The development of the number of students that increases from year to year requires accuracy in providing assessments without any mistakes and repetition of the same data. The purpose of this research is to design and make student assessment applications with object-oriented programming in the Al-Amin Play Group. Using the Waterfall model System Development Life Cycle (SDLC) method, the design based on the Unified Modeling Language (UML) and the Java Netbeans 8.2 programming language MySQL database. The research data includes student data, student attendance every semester from 2018 to 2019. The final result of the research is an object-oriented student assessment system that can be accessed through a laptop, personal computer (PC) device which is expected to help the foundation to facilitate data collection and processing of value data students and can see the progress of students in each semester at the Al-Amin Play Group in Kedewan Village. The system test results were declared feasible in terms of functionality, amounting to 97.9% in black box testing.]]>
<![CDATA[SISTEM PENDUKUNG KEPUTUSAN PEMILIHAN HANDPHONE DENGAN MENGGUNAKAN METODE WEIGHT PRODUCT ]]>
<![CDATA[Muslimah Katoningati]]>;
<![CDATA[Adhika Pramita Widyassari]]>
<![CDATA[ SIMETRIS Vol 15 No 1 (2021): SIMETRIS ]]>
Publisher : <![CDATA[Sekolah Tinggi Teknologi Ronggolawe Cepu ]]>
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DOI: 10.51901/simetris.v15i01.167
<![CDATA[Mobile as a telecommunication equipment which is the main requirement nowadays, is equipped with many features that every mobile phone has. The large number of types of mobile phones makes consumers have to be smart in choosing cellphones that can be used every day. Not understanding the advantages and disadvantages of improperly chosen mobile phones can cause harm to consumers based on the user's interest level. In this study, a calculation analysis will be carried out with some alternative data for mobile phones based on predetermined criteria using the weighted product method, which can solve the problem by multiplying to connect the rating attribute with the weight attribute concerned. It is expected that from the concept of this calculation analysis can become knowledge about the weighted product method in the selection of recommended cellphones, as a basis for an overview for developing the implementation of the weighted product method into further research.]]>
<![CDATA[Analisis Malware Botnet Proteus Pendekatan Static dan Dinamic ]]>
<![CDATA[Indra Gunawan]]>
<![CDATA[ SIMETRIS Vol 15 No 1 (2021): SIMETRIS ]]>
Publisher : <![CDATA[Sekolah Tinggi Teknologi Ronggolawe Cepu ]]>
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DOI: 10.51901/simetris.v15i01.172
<![CDATA[Botnet Proteus dianggap sebagai salah satu botnet yang mengerikan dampaknya terhadap dunia internet di kisaran tahun 2017, botnet ini mulai dideteksi akhir tahun 2016 dan terus menyebar setelahnya. Proteus adalah botnet yang sample virusnya sulit didapatkan sehingga sangat sedikit penelitian yang membahasnya. Dalam penelitian ini digunakan pendekatan static dan dinamis untuk proses analisis terhadap botnet, pendekatan static dilakukan dengan analisis file virus secara langsung, sedangkan pada pendekatan dynamic, analisa dilakukan melalui jaringan terhadap paket-paket. Hasil analisis menunjukkan bahwa botnet ini menggunakan fitur-fitur Obfuscated, Cryptology, berbasis .Net, memiliki Command & Center, memodifikasi registry, memodifikasi file sistem windows, hanya aktif jika terdapat koneksi internet, tidak melakukan perusakan terhadap file-file yang ada. Kesimpulan akhir dari analisis tersebut menunjukkan bahwa botnet proteus dapat di kategorikan sebagai malware yang lebih bersifat sebagai malware pencuri data serta malware pembuat dan pengontrol zombie computer.]]>
<![CDATA[Analisa Berat Isi Dan Kuat Tekan Bata Ringan Menggunakan Foam Agent dengan Bahan Tambah Serbuk Gypsum ]]>
<![CDATA[Eko Prayitno]]>
<![CDATA[ SIMETRIS Vol 15 No 1 (2021): SIMETRIS ]]>
Publisher : <![CDATA[Sekolah Tinggi Teknologi Ronggolawe Cepu ]]>
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DOI: 10.51901/simetris.v15i01.174
<![CDATA[The development of science and human creativity in the construction sector today has found a lot of time efficient technology and implementation that can reduce the budget for work costs. Among these technologies is the discovery and use of light bricks as construction walls. In this research, a light brick was made using foam agent as an added material. While the fine aggregate used is Bengawan Solo River sand with grading of sand that has passed a certain filter and Mount sand from Muntilan as well as gypsum powder added material. The purpose of this study was to determine the effect of the addition of foam agent and gypsum powder to the weight and compressive strength of lightweight bricks with a mixture of cement: Bengawan Solo river sand and cement mixture: mountain sand from Muntilan. The method used is to make a test object with a size of 5 cm × 5 cm × 5 cm. The results showed that the weight of light bricks with a foam agent mixture of 0.8% with added gypsum powder was 6.76% heavier using a mixture with Mount Muntilan sand than using Bengawan Solo river sand which only reached 1231.47 kg / m3. . While the compressive strength characteristics of lightweight bricks using gypsum powder added material using a 0.8% foam agent obtained 3.05% higher yields using a mixture of Mount Muntilan sand than using Solo River sand which only reached 10.82 MPa.]]>
<![CDATA[ANALISIS KETIDAK SEIMBANGAN BEBAN PADA TRANSFORMATOR DISTRIBUSI Di PT. PLN (Persero) RAYON CEPU ]]>
<![CDATA[Agus Darwanto]]>
<![CDATA[ SIMETRIS Vol 15 No 1 (2021): SIMETRIS ]]>
Publisher : <![CDATA[Sekolah Tinggi Teknologi Ronggolawe Cepu ]]>
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DOI: 10.51901/simetris.v15i01.179
<![CDATA[Tenaga listrik merupakan sumber energi yang sangat penting bagi kehidupan. Salah satu komponen kelistrikan tersebut adalah trafo distribusi yang digunakan untuk menyalurkan tenaga listrik dari gardu induk ke pusat beban. Pada trafo distribusi sering terjadi ketidakseimbangan beban akibat perbedaan beban pada setiap fasa sisi sekunder trafo. Hal ini menyebabkan arus netral mengalir pada transformator dan dapat mengakibatkan rugi daya. Di PT. PLN (Persero) Rayon Cepu memiliki dua trafo distribusi dengan kapasitas yang sama yaitu 50 kVA tetapi pembebanannya berbeda, trafo CU1-391 / 9 memiliki beban rata-rata 80% sedangkan trafo CU1-400 memiliki pembebanan rata-rata 35 %. Berdasarkan perhitungan yang telah dilakukan, rata-rata ketidakseimbangan beban pada trafo CU1-391 / 9 selama satu bulan adalah 24,60% pada pukul 11.00-16.00 WIB dan ketidakseimbangan 11,39% pada pukul 17.00-22.00 WIB. Terjadi pula pemutusan aliran listrik akibat arus netral selama satu bulan sebesar 9.03181842 kWh pukul 11.00-16.00 WIB dan listrik mati pukul 14.16844809 kWh pukul 17.00-22.00 WIB serta kerugian yang dialami PLN pada pukul 11.00-16.00 WIB sebesar Rp159.026,47 dan Rp. 249.468,96. pukul 17.00-22.00 WIB. Untuk trafo CU1-400, ketidakseimbangan beban selama satu bulan adalah 68,20% pada pukul 11.00-16.00 WIB dan 64.46% untuk ketidakseimbangan beban pada pukul 17.00-22.00 WIB. Kehilangan daya akibat arus netral sebesar 46.18865203 kWh pukul 11.00-16.00 WIB dan 54.81367038 kWh pukul 17.00-22.00 WIB. Kerugian yang diderita PLN sebesar Rp813.260,22 pada pukul 11.00-16.00 WIB dan kerugian akibat pemborosan energi yang dialami PLN pada pukul 17.00-22.00 WIB sebesar Rp 965.124,03.]]>
<![CDATA[Pengaruh Kemiringan Sudut Kontak Drive Pulley Continuously Variable Transmission (CVT) Standar dan Modifikasi pada Sepeda Motor Yamaha SOUL GT Terhadap Keluaran Daya ]]>
<![CDATA[Joko Waluyo]]>
<![CDATA[ SIMETRIS Vol 15 No 1 (2021): SIMETRIS ]]>
Publisher : <![CDATA[Sekolah Tinggi Teknologi Ronggolawe Cepu ]]>
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DOI: 10.51901/simetris.v15i01.184
<![CDATA[Research titled Effect of puley continioly variable Transmision (CVT) standard and modivikasi drive contact angle on Yamaha SOUL GT 155 CC motorcycle on power output, the purpose of this study is to determine the effect of the most maximum changes in power and torque His research method is experimentally conducting his research at Karbu Racing Jogja GG. Tutul 2 No.80, Papringan, Caturtunggal, Kecamatan, Depok Sleman, Special Region of Yogyakarta tools used dyno test and tacho meter. The results of the study obtained that the power and torque for pully with modivikasi 13 0 has a greater value when compared to the standard pulley 140. The results resulted in a modivikasi pulley of 130 power and a maximum torque of 7.87 HP and 14.94 Newton meters at a rotation of 3250 RPM. So it can be concluded that pulley modivikasi 130 is very suitable when used for motor racing. Keywords : pulley 130, pully 140 , Torque, power, motor racing]]>
<![CDATA[The Effectiveness of Teaching English Vocabulary Using Dictionary Online Media in STTR Cepu in Academic Year of 2020-2021 ]]>
<![CDATA[Helmi Gunawan]]>
<![CDATA[ SIMETRIS Vol 15 No 1 (2021): SIMETRIS ]]>
Publisher : <![CDATA[Sekolah Tinggi Teknologi Ronggolawe Cepu ]]>
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DOI: 10.51901/simetris.v15i1.253
<![CDATA[The Covid-19 pandemic, apart from providing a bad experience, can also make someone challenged and offer to develop learning but in Engineering English lectures. At first the learning was carried out face-to-face, this time it was carried out boldly. Vocabulary is a basic and important knowledge in Mastering English. One of the vocabulary learning strategies during the pandemic is through online media. This research was conducted in order to determine the effectiveness of vocabulary learning by using an online dictionary for Mechanical Engineering Students STTR Cepu. This study used a descriptive approach. There are 30 students as respondents. Based on the questionnaire and strongly agree by 43.3%, agree by 46.7% say disagree and strongly agree. So that it can be said that the effectiveness of learning vocabulary using online dictionaries is weak in mechanical engineering students at STTR Cepu.]]>
<![CDATA[Analisis Performance Centrifugal Pump dengan Mengunakan Computating Fluid Dinamyc (CFD) untuk Transfer Condensate di Area Onshore Processing Facilities Balongan PHE ONWJ ]]>
<![CDATA[Mudjijanto Mudjijanto]]>
<![CDATA[ SIMETRIS Vol 15 No 1 (2021): SIMETRIS ]]>
Publisher : <![CDATA[Sekolah Tinggi Teknologi Ronggolawe Cepu ]]>
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DOI: 10.51901/simetris.v15i1.319
<![CDATA[Condensate transfer is one part of upstream oil and gas production operations. Condensate is a liquid hydrocarbon obtained from gas wells. Transfer is carried out using a transfer pump. In the activity of using the pump, we need to analyze the pump parameters. The aim is to evaluate the energy performance of the pump according to the variation of the velocity of the fluid being flowed and to determine the pump's working point. The research was conducted by testing the performance of the pump in the field and analyzing it using CFD in solidwork application. The method applied is to change the flow variation with a fluid velocity of 5.9m/s; 17.2m/s ; 20.5m/s. Tests are carried out to determine the pressure and temperature of the pump. The test data in the field will then be compared with the simulation data in the application. The results of the analysis carried out using a flow variation of 5.9 m/s and 17.2 m/s obtained a pressure and temperature comparison between the actual and the simulated according to the operating conditions of the pump. In the analysis with a speed variation of 20.5 m/s there is an indication of a decrease in pump pressure under actual conditions in the field, namely 39 Psi, while in the simulation with ideal conditions it exceeds the operating pressure of the pump. So the conclusion obtained is that the variation in flow causes differences in pump performance in terms of Pressure and Temperature. At a variable speed of 20.5 m/s there is a change in pump performance and if left unchecked can cause damage in the long term.]]>
