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TEKNIK

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Published by Universitas Diponegoro

ISSN : 08521697 EISSN : 24609919 DOI : -

Core Subject : Engineering,

Engineering

Journal yang mempublikasikan artikel-artikel ilmiah dari berbagai disiplin ilmu rekayasa/keteknikan. Artikel-artikel yang dipublikasikan di Jurnal TEKNIK meliputi hasil-hasil penelitian ilmiah asli (prioritas utama), artikel ulasan ilmiah yang bersifat baru (tidak prioritas), atau komentar atau kritik terhadap tulisan ilmiah yang dipublikasikan oleh Jurnal TEKNIK.

Arjuna Subject : -

Articles 518 Documents

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Erratum TEKNIK, Editor in Chief
TEKNIK Vol 40, No. 2 (2019): Agustus 2019
Publisher : Diponegoro University

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PERSEPSI MASYARAKAT TERHADAP ALUN-ALUN KOTA BANDUNG SEBAGAI RUANG TERBUKA PUBLIK Wibowo, Heru; Rukayah, R. Siti; Suprapti, Atiek
TEKNIK Vol 36, No 1 (2015): (Juli 2015)
Publisher : Diponegoro University

Bandung merupakan sebuah kota yang strategis yang memiliki nilai sejarah yang cukup panjang dalam masa perjuangan. Alun alun Bandung merupakan hasil warisan ciri kota tradisional yang dibangun oleh penguasa kolonial yang merupakan pusat ruang terbuka kota. Dari masa kemasa Alun-alun kota Bandung telah mengalami beberapa kali perubahan, baik bentuk maupun fungsinya sehingga mengakibatkan degradasi makna terhadap fungsinya bagi masyarakat Kota Bandung itu sendiri. Maka fenomena tersebut mengarahkan kepada pertanyaan penelitian yaitu bagaimana persepsi masyarakat terhadap Alun-alun Kota Bandung ditinjau sebagai ruang terbuka publik. Tujuan penelitian ini adalah untuk mengetahui persepsi masyarakat terhadap Alun-alun Kota Bandung. Dari tujuan tersebut maka sasaran yang dilakukan adalah mengidentifikasi karakter dan fungsi ruang terbuka publik yaitu fungsi ekologis, arsitektural, dan sosial. Dari hasil analisis dengan menggunakan kuesioner yaitu uji sampel dengan regresi linear sederhana dengan pendekatan analisis pengguna dan analisis karakteristik ruang terbuka publik. Hasil penelitian ini menghasilkan penilaian baik terhadap korelasi variabel bebas yaitu persepsi masyarakat terhadap variabel terikat yaitu Alun-alun Kota Bandung, setiap kali pertanyaan yang berkenaan dengan Persepsi masyarakat terhadap Alun-alun Kota Bandung akan mempengaruhi nilai hasil pengujian yang cenderung meningkat akan keberadaan Alun-alun itu sendiri. Hasil penelitian ini bisa dimanfaatkan untuk mengangkat kembali citra Alun-alun Kota Bandung sebagai ruang publik atau (Central Square).[Public Perception of The Alun-alun Bandung as Public Open Space] Bandung is a city that has a value that strategic long history in the struggle. Alun Bandung square is the result of inherited traits of traditional town built by the colonial rulers which is the center of the city open space. Over time, Bandung town square has undergone several changes, both form and function, resulting in degradation of the meaning of the function for the city of London itself. The phenomenon then leads to the research question is how the public perception of the square is the city of Bandung reviewed as public open space for the present study tries to analyze the function of the existence of Bandung City Square as a public space. The purpose of this study was to determine the public perception of the square is the city of Bandung. From these objectives, the target does is identify the character and function of public open space that is the function of ecological, architectural and social. From the analysis by using a questionnaire that test samples with a simple linear regression analysis approach and analysis of the characteristics of users of public open space. The results of this study resulted in better assessment of the correlation of the independent variable is the public perception of the dependent variable is the town square of Bandung, every time queries regarding the public's perception of the town square Bandung will affect the value of the test results are likely to increase in the existence Square itself. the results of this study can be used to lift the image of Bandung city square as a public space or (Central Square).Â

KAJIAN PELESTARIAN KAMPUNG KAUMAN KUDUS SEBAGAI KAWASAN BERSEJARAH PENYEBARAN AGAMA ISLAM Nurini, Nurini
TEKNIK Volume 32, Nomor 1, Tahun 2011
Publisher : Diponegoro University

Historic area as a cultural heritage is one of the most precious relic of the past, because of the presence ofbuildings and the character of its surroundings have historical value that displays a visual story of a certainplace. As one of the cities central to the spread of Islam in Java â€œKauman Village, Kudusâ€ has a specialcharacter and a specific Islamic cultural heritage, whether in the form of tangible or intangible heritage and theabstract that needs to be maintained.The purpose of this study is to assess the potential of the cultural heritage of the â€œKauman Village, Kudusâ€ inan effort to preserve and protect cultural heritage based on its characteristic as an area central to the spread ofIslam in the region.

RISK ANALYSIS STUDY OF NOx, and SOx FROM TRANSPORTATION (CASE STUDY: MAIN STREETS OF D.I. JOGJAKARTA) Arief Budihardjo, Mochamad
TEKNIK Volume 28, Nomor 1, Tahun 2007
Publisher : Diponegoro University

The air pollution problems have been progressively set attention to the world especially industrialcountries recently. These problems not only give affect at health like emphysema, bronchitis, and otherinhalation disease but also make plants and properties destruction causes very big loss. This research isconcerned with the risk level which is accepted by people who reside in roadside because most of airpollutants come from transportation facilities such as motor vehicle. The limitation of the research is airpollutants exposure such like NOx, and SOx which enter the body through respiration. This risk analysisresearch is broken down into four step as follow; hazard identification showing NO2, and SO2concentration in 15 sampling locations where the highest value of NO2 is 56,5 Î¼g / m3 and SO2 is 28,87Î¼g/m3. According to DIY Governor Regulation No. 153 Year 2002 about the value of ambient air qualitystandard, quality standard of NO2 is 400 Î¼g / m3, and SO2 is 900 Î¼g / m3. It can be concluded thatconcentration of NO2 and SO2 in 2005 within all sampling locations is still under of quality standard. Thestep of exposure assessment involves the exposed population including pedicab worker, park worker, andcloister merchant. From calculation, the intake range of NO2 enters the body is 0,0025-0,0075 mg/kg.dayand SO2 is 0,0008-0,0038 mg/kg.day. Third step is dose-response assessment to find out what will be facedby people if exposure of pollutants occurs in a certain dose. The last step is risk characterization, theresult of research is that risk value / Hazard Index (HI) less than 1 that still acceptable. It can besummarized that the ambient air quality of Jogjakarta especially NO2 and SO2 gas do not too adverse tohealth.

Penyelesaian Numerik Persamaan Advection Dengan Radial Point Interpolation Method dan Integrasi Waktu Dengan Discontinuous Galerkin Method Sadono, Kresno Wikan
TEKNIK Vol 37, No 2 (2016): (Desember 2016)
Publisher : Diponegoro University

Persamaan differensial banyak digunakan untuk menggambarkan berbagai fenomena dalam bidang sains dan rekayasa. Berbagai masalah komplek dalam kehidupan sehari-hari dapat dimodelkan dengan persamaan differensial dan diselesaikan dengan metode numerik. Salah satu metode numerik, yaitu metode meshfree atau meshless berkembang akhir-akhir ini, tanpa proses pembuatan elemen pada domain. Penelitian ini menggabungkan metode meshless yaitu radial basis point interpolation method (RPIM) dengan integrasi waktu discontinuous Galerkin method (DGM), metode ini disebut RPIM-DGM. Metode RPIM-DGM diaplikasikan pada advection equation pada satu dimensi. RPIM menggunakan basis function multiquadratic function (MQ) dan integrasi waktu diturunkan untuk linear-DGM maupun quadratic-DGM. Hasil simulasi menunjukkan, metode ini mendekati hasil analitis dengan baik. Hasil simulasi numerik dengan RPIM DGM menunjukkan semakin banyak node dan semakin kecil time increment menunjukkan hasil numerik semakin akurat. Hasil lain menunjukkan, integrasi numerik dengan quadratic-DGM untuk suatu time increment dan jumlah node tertentu semakin meningkatkan akurasi dibandingkan dengan linear-DGM.Â [Title: Numerical solution of advection equation with radial basis interpolation method and discontinuous Galerkin method for time integration] Differential equation is widely used to describe a variety of phenomena in science and engineering. A variety of complex issues in everyday life can be modeled with differential equations and solved by numerical method. One of the numerical methods, the method meshfree or meshless developing lately, without making use of the elements in the domain. The research combines methods meshless, i.e. radial basis point interpolation method with discontinuous Galerkin method as time integration method. This method is called RPIM-DGM. The RPIM-DGM applied to one dimension advection equation. The RPIM using basis function multiquadratic function and time integration is derived for linear-DGM and quadratic-DGM. The simulation result shows that this numerical method, close to the results exact well. The results of numerical simulations with RPIM-DGM show, the more nodes and the smaller the time increment, the more accurate the numerical results. Other results showed, integration with quadratic-DGM for a time increment, and a certain number of nodes, further improving accuracy, compared with the linear-DGM.Â

EFFECT OF NITROGEN SOURCE AND INITIAL SUGAR CONCENTRATION ON LACTIC ACID FERMENTATION OF PINEAPPLE WASTE USING L.DELBRUECKII Moch Busairi, Abdullah
TEKNIK Volume 31, Nomor 1, Tahun 2010
Publisher : Diponegoro University

The liquid pineapple waste contains mainly sucrose, glucose, fructose and other nutrients. It therefore can potentially be used as carbon source for lactic acid fermentation. The lactic acid is utilised in food technology as pH regulator, microbial preservative, buffering agent and in the chemical industry. Recently, lactic acid has been considered to be an important raw material for production of biodegradable lactate polymer. The experiments were carried out in batch fermentation at anaerobic condition with stirring speed: 50 rpm, temperature: 40 oC, pH: 6.0, and inoculum size: 5%. Effect of nitrogen source and initial sugar concentration were studied. The effect of nitrogen source on lactic acid production shows that the yeast extract is highest yield , followed by urea , corn steep liquor, malt sprout and ammonium sulphates with the yield of 78.52; 26.68; 19.14; 14.10 and 5.6 %, respectively. The highest yield of initial sugar concentration on lactic acid production obtained was 78.52 % (54.97 g/l) at 70 g/l, if the concentration of sugar was increased to 110 g/l , the lactic acid production or yield decrease to51.53 g/l or 54.24%.

KARAKTERISASI BLOK REM KERETA API BERBAHAN BESI COR DAN Al-SiC BERDASARKAN KEKUATAN UJI TARIK DAN HARGA IMPAK Senen, Senen; Bayuseno, A.P.
TEKNIK Volume 33, Nomor 1, Tahun 2012
Publisher : Diponegoro University

The train is currently trusted by the people of Indonesia as a cheap and safe means of transportation. One fromthat must be met by a train is a reliable braking system. Generally the train brake block material is used graycast iron brake block.One of materials based composite as a substitute for train brake block are the Al-SiC (Aluminium SilicaCarbida). The Al-SiC composite material has hard and soft properties. Aluminium (Al) as a matrix and SiC asreinforcement. Metal material composite used for the reseach is Al-SiC composite with composition of SiC 15%,10%, and 15% made through a process of stir casting. The specimens were tested tensile strength and impacttests. The test of results : tensile test for cast iron = 188.56 MPa; aluminium = 131.97 MPa; Al-SiC 5% =127.17 MPa, 10% = 136.41 MPa dan 15% = 107.26 MPa. The result of the energy absorbed of impact test arecast iron = 2.17 Joule; aluminium = 8.67 Joule; Al-SiC 5% = 4.00 Joule, 10% = 4.67 Joule and 15% = 2.83Joule.From the result of test, so replacement of cast iron brake material block is composite brake material block witha composition 10% of AL-SiC.

Solusi Jalan Satu Arah di Kota Yogyakarta Romadhona, Prima J.
TEKNIK Vol 39, No 1 (2018): (July 2018)
Publisher : Diponegoro University

Berbanding linear dengan pesatnya pembangunan tata guna lahan yang ada, Yogyakarta berkembang menjadi suatu kota modern dengan mobilitas yang tinggi. Namun, infrastruktur jalan di Kota Yogyakarta saat ini belum dapat memfasilitasi penambahan kendaraan bermotor yang sangat cepat sehingga kemacetan menjadi hal yang sering dilihat di beberapa lokasi. Kebijakan jangka pendek yang bisa ditempuh untuk mengurangi kemacetan adalah melakukan sistem jalan satu arah. Artikel ini memuat kajian kinerja simulasi jalan satu arah pada dua loop terindentifikasi kemacetan, yaitu Loop I: Jalan Prawirotaman-Sisingamangaraja-Parangtritis- Menukan dan Loop II: Jalan Pramuka- Gambiran Selatan-Perintis Kemerdekaan Barat. Data primer berasal dari survei kecepatan dan volume kendaraan pada kedua loop tersebut dan didukung oleh data sekunder yang diperoleh dari Dinas Perhubungan Kota Yogyakarta. Kedua datatersebut menjadi materi untuk disimulasikan dengan software PTV VISSIM sehingga didapatkan kinerja jalan sebelum dan sesudah menggunakan metode satu arah. Hasilnya, terjadi peningkatan kinerja dengan menurunnya derajat jenuh sebesar55% dan peningkatan kecepatan hingga mencapai 19% pada ruas jalan yang diberlakukan manajemen lalu lintas satu arah. Di sisi lain penerapan lalu lintas satu arah berefek pada penurunan kinerja pada ruas jalan di sekitarnya dengan meningkatnya derajat jenuh sebesar4% tapi terjadi peningkatan kecepatan 5% di ruas jalan yang lain lagi.

PENGENDALIAN MESIN HOIST HANGER DALAM PROSES PTC/ED MENGGUNAKAN PLC OMRON Wahyudi, Wahyudi; Asâ€™ari, M. Hasim
TEKNIK Volume 30, Nomor 1, Tahun 2009
Publisher : Diponegoro University

The development of technology demands efficient and work speed, so it needs a system which can handleseveral things.This problem can be covered with PLC (Programmable Logic Control) that can integrateseveral self standing component to be an integrated control system and can be changed the configurationwithout change all instrument. Modify the ladder program can alter system of PLC. This paper showsHoist Hanger system in PTC/ED (Pre Treatment Chemical/Electrocoat Dispotition) process that controlledby PLC. Above input from limit switch, sensor, or the other input, PLC system drives the motorrelay Hoist Hanger machine. That cause the motor relay Hoist Hanger change its condition, so the movingof Hoist Hanger machine will be suitable with PLC program.

UNJUK KERJA REAKTOR PLASMA DIELECTRIC BARRIER DISCHARGE UNTUK PRODUKSI BIODIESEL DARI MINYAK KELAPA SAWIT Yudhistira, Ardian Dwi; Istadi, Istadi
TEKNIK Volume 34, Nomor 2, Tahun 2013
Publisher : Diponegoro University

Biodiesel is one of alternative renewable energy source to substitute diesel fuel. Various biodiesel productionprocesses through transesterification reaction with a variety of catalysts have been developed by previousresearcher. This process still has the disadvantage of a long reaction time, and high energy need. DielectricBarrier Discharge (DBD) plasma electro-catalysis may become a solution to overcome the drawbacks in theconventional transesterification process. This process only needs a short time reaction and low energy process.The purpose of this study was to assess the performance of DBD plasma rector in making biodiesel such as: theeffect of high voltage electric value, electrodes gap, mole ratio of methanol / oil, and reaction time. TheResearch method was using GC-MS (Gas Cromatography-Mass Spectrofotometry) and FTIR (FourierTransform Infrared Spectrofotometry) and then it will be analysed the change of chemical bond betweenreactant and product. So, the reaction mechanism can be predicted. Biodiesel is produced using methanol andpalm oil as reactants and DBD plasma used as reactor in batch system. Then, reactants contacted by highvoltage electric. From the results of this research can be concluded that the reaction mechanism occurs in theprocess is the reaction mechanism of cracking, the higher of electric voltage and the longer of reaction time leadto increasing of product yield. The more of mole ratio of methanol / oil and widening the gap between theelectrodes lead to decreased product yield. From this research, product yield maksimum is 89,8% in the variableof rasio mol metanol/palm oil 3:1, voltage 10 kV, electrode gap 1,5 cm, and reaction time 30 seconds.

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