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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.

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Articles 522 Documents

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THE ANALYSIS OF PARTIAL DISCHARGE (PD) FROM ELECTRICAL TREEING IN LINEAR LOW DENSITY POLYETHYLENE (LLDPE) AND HIGH DENSITY POLYETHYLENE (HDPE) Hermawan, Hermawan; Syakur, Abdul
TEKNIK Volume 29, Nomor 3, Tahun 2008
Publisher : Diponegoro University

Recently, the transmission of electric energy has been developed by insulated cable. The suitable materialas an insulated cable is LLDPE and HDPE. In order to understand the quality of insulation system, themeasuring of PD has done. PD could begin completely insulation failure (breakdown). Therefore, it is veryimportant to understand the characteristic of PD and the enclose event on it, because PD is a main factorwhich caused insulation failure.This paper presents the result of PD measurement in the laboratory that used needle-plane electrode. Itwas supported by equipments such as osiloskop Digital GDS 2104 GW Instek, HPF, and RC detector.Polymer sample that used in this research is LLDPE (Linier Low Density Polyethylene) and HDPE with 20x 4 x 25 mm3 dimension in each. Needle was made by steel (length 50 mm and diameter 1.15 mm), it wasstick to the polymer material. The distance between needle to the plane is 5 mm. The applied voltage foreach sample was 16 kVrms, 18 kVrms, 20 kVrms and 22 kVrms. The Taking of PD data was done in thefirst minute, 10th minute, 20th and so on until 180th minute.The measurement result shows that the characteristic of PD number and maximum charge as a function oftime and as a function of applied voltage inclined increasing both on LLDPE and HDPE. But, PD intensityin HDPE is higher than LLDPE.

Pengaruh Sosial Budaya Islami Terhadap Tatanan Permukiman Kampung Arab Sugihwaras Wulandari, Astari; Setioko, Bambang; Suprapti, Atik
TEKNIK Vol 37, No 1 (2016): (Juli 2016)
Publisher : Diponegoro University

Bentuk lingkungan permukiman sebagai suatu produk komunitas adalah hasil kesepakatan sosial dan bukan merupakan produk inividual. Dengan kata lain, komunitas yang berbeda tentunya akan menunjukkan karakter yang berbeda pula. Kampung Arab Sugihwaras sebagai permukiman yang dihuni oleh masyarakat keturunan Arab di Pekalongan terancam oleh berbagai perubahan baik pada aspek sosial budaya maupun bentukan fisik permukiman. Pada kondisi ideal bentukan fisik permukiman yang khas yang diperkuat oleh nilai â€“ nilai sosial budaya masyarakat keturunan Arab di Sugihwaras dapat menjadi suatu identitas tersendiri bagi kawasan. Untuk itu penting untuk mengetahui pengaruh sosial budaya Islami terhadap tatanan permukiman untuk mencegah hilangnya identitas masyarakat dan mempertahankan keteraturan lingkungan permukiman. Tujuan penelitian ini adalah untuk mengetahui bagaimanakah pengaruh sosial budaya Islami terhadap tatanan permukiman Kampung Arab Sugihwaras. Penelitian ini dilakukan dengan menggunakan metodologi kuantitatif deskriptif melalui paradigm postpositivistik. Berdasarkan hasil uji regresi terhadap variabel penelitian ditemukan adanya pengaruh sosial budaya Islami sebesar 14,2, % sedangkan secara parsial tidak semua variabel pada sosial budaya Islami berpengaruh terhadap tatanan permukiman. Akan tetapi hanya variabel lingkungan bertetangga saja yang menunjukkan adanya pengaruh secara langsung. [The Islamic Socio-Cultural Influence toward Settlement Arragement in Kampung Arab Sugihwaras] Neighborhoods forms as a community product is the result of social consensus and not a product inividual. In other words, different communities will certainly show different characters. Sugihwaras Arab village as a settlement inhabited by the descendants of Arabs in Pekalongan threatened by various changes both in the socio-cultural aspects as well as the space order of settlements. On the ideal conditions, space order of typical settlement reinforced by values - social and cultural values of Arab descent in Sugihwaras can be a separate identity for the region. It is important to know the social influence of Islamic culture against settlement arrangement to prevent the loss of community identity and maintain regularity neighborhoods. The purpose of this study was to determine how the social influence of Islamic culture to the Arab village Sugihwaras settlement arrangement. This research was done by using descriptive quantitative methodology through post- positivistm paradigm. Based on the results of the regression test against variables the study found the social influence of Islamic culture by 14.2% while partially not all socio-cultural variables on Islamic influence on settlement arrangement. But only neighbourhood variables showed a direct influence to the settlement arragement in Kampung Arab Sugihwaras.Â

OPTIMALISASI EKSTRAKSI DAN UJI STABILITAS PHYCOCYANIN DARI MIKROALGA Spirulina platensis Jos, Bakti; Eko Setyawan, Prayudi; Satria, Yudha
TEKNIK Volume 32, Nomor 3, Tahun 2011
Publisher : Diponegoro University

The growing awareness of the importance of natural colours especially food and cosmetic colorants has placedgreat demand on biological sources of natural colours. It is for this reason that the phycobiliproteins inSpirulina platensis is gaining increasing attention as an alternative colour for these products. Numerousscientific reports confirm the fact that Phycocyanin from Spirulina platensis, is not only an effective naturalblue colorant, but also a compound that is beneficial to the health of the consumer. The aim of this research is toconduct evaluation studies phycocyanin production by extraction with polar solvents at various concentrationsto obtain extracts for maximum yield. The methods in this study has several stages, namely preparation ofmaterials, extraction, solubility studies of phycocyanin, phycocyaninâ€™s stability test. Changing variables in thisstudy are water, acetic acid 70%, 75%, 80%, ammonium sulphate 50%, 55%, 60%. The analysis of the extractsof phycocyaninâ€™s content using spectrophotometric methods. The observations produces a blue pigment whichhas the highest color intensity with maximum absorbance of 620 nm. Acetic acid 80% is the most effectivesolvent to extract the blue pigment phycocyanin than water and ammonium sulfate. Extraction is influenced bythe pH of the increase in absorption (absorbance) with increasing pH and was not influenced by storagetemperature and time

APLIKASI FIS MODEL SUGENO PADA PENGENDALIAN VALVE UNTUK MANGATUR TINGGI LEVEL AIR Wahyudi, Wahyudi; Setiawan, Iwan; Nainggolan, Martina
TEKNIK Volume 28, Nomor 2, Tahun 2007
Publisher : Diponegoro University

Fuzzy control is one of the controller alternative using expert system ( human being logic) as controller sothat do not need knowledge concerning parameter of systems. Fuzzy control also have ability of lightcomputing. This paper goal is making a Fuzzy control and observe the response of the plant had beencontrolled. The experimentâ€™s purpose is to show the performance of Fuzzy control in control valve systemin order to liquid level controlling on-linely. Water level controlled by opening the load valve in the holdtank. The project experimentâ€™s include examination conduct logic of Fuzzy program of Codevision AVR,examination of system at some references, examination the changing of liquid level reference, andexamination of system with the influence of disturbance. From the test, it is known that Fuzzy control withAVR ATmega8535 can yield eliminate offset in arranging opening of valve. Offset in examination ofsystem at some references are 0,4 cm , 0,02 cm , 0,17 cm, 0,11 cm, and 0,54 cm. Offset in examination thechanging of liquid levels are 0,07 cm, 0,02 cm, and 0,04 cm.

Pembuatan Briket Arang Dari Campuran Tempurung Kelapa dan Serbuk Gergaji Kayu Sengon Anggoro, Didi Dwi; Wibawa, Muhammad Hanif Dzikri; Fathoni, Moch Zaenal
TEKNIK Vol 38, No 2 (2017): (Desember 2017)
Publisher : Diponegoro University

Indonesia merupakan negara tropis yang memiliki potensi dalam pengembangan energi terbarukan berupa energy biomassa dari briket tempurung kelapa. Briket ini merupakan hasil pengolahan limbah biomasa, diantaranya tempurung kelapa dan serbuk kayu. Tujuan penelitian ini adalah untuk mengetahui pengaruh suhu, konsentrasi perekat dan komposisi bahan baku terhadap nilai kalorÂ briket. Bahan yang digunakan antara lain serbuk gergaji sengon, tempurung kelapa, tepung tapioka, aquadest. Alat yang digunakan kiln drum, alat pengempa briket, bom kalorimeter, oven, alat screening. Variabel berubah dalam percobaan adalah komposisi bahan baku dan kadar perekat. Langkah penelitian dilakukan dengan pengarangan bahan baku, pencampuran komposisi bahan baku dengan variabel perekat, pencetakan dan pengempaan, uji coba nilai kalor, terakhir analisa data. Hasil pengujian nilai kalor briket bahwa semakin banyak komposisi bahan yang memiliki kalor lebih tinggi maka nilai kalorÂ campuran briket akan semakin tinggi. Nilai kalor briket sampel tidak memenuhi syarat untuk briket arang buatan Amerika, Inggris, dan Jepang namun diantaranya memenuhi syarat standar nasional Indonesia. Penambahan perekat dalam Â pembuatan briket tempurung kelapa dimaksudkan agar partikel arang saling berikatan dan tidak mudah hancur, namun penambahan perekat yang berlebih akan menurunkan kualitas briket, semakin tinggi kadar perekat maka nilai kalor akan berkurang

KONVERSI ELEKTROKIMIA AMONIA MENJADI HIDROGEN Ratnawati, Ratnawati; Sumarno, Sumarno; Nugroho, Amin
TEKNIK Volume 31, Nomor 2, Tahun 2010
Publisher : Diponegoro University

One of the most dangerous pollutants in wastewater is ammonia. The concentration of ammonia inwastewater discharged from nitrogen fertilizer industry is up to 1500 ppm. Ammonia can be removed byseveral methods such as biological denitrification, air-stripping, and ion exchange. The methods cannotreduce the concentration of ammonia to a low level as required for standard quality of wastewater. Theelectrochemical method has recently attracted attention for the treatment of wastewater containing ammonia.This research is aimed to evaluate the effect of ammonia concentration, current density, and time on theelectrolysis process. Synthetic wastewater containing 500-1500 ppm of ammonia was used in this research.The solution was electrolyzed in a electrolytic cell with Pt/SS electrodes. The experiment was conducted byvarying current density in the range of 5 â€“ 10 mA/cm2 and time from 0 to 105 minutes. The experiment resultsshow that as current density rises, the electrolytic reaction occurs more rapidly. On the other hand, initialconcentration of ammonia has negative effect on the final conversion of ammonia.

METODE PENENTUAN VOLUME AGGREGAT PONDASI JALAN BERDASARKAN VARIASI DAN KESALAHAN: STUDI KASUS Simamora, Marsinta; Dwi Hatmoko, Jati Utomo
TEKNIK Volume 34, Nomor 1, Tahun 2013
Publisher : Diponegoro University

Variations between plans and reality can hardly be avoided in construction projects. These variations may beaccepted when they are still in the acceptance limits, or rejected when they are beyond the acceptance limits.The former is called variation in acceptance and the later is called error. Distinguishing these two in acompleted construction work is very important, as rejected variations (errors) may be considered as breaching acontract, thus may have legal implications. The research aims to evaluate the traditional calculation method(MeTrad) and to promote variation acceptance and error approach (MeVE) that is able to draw a clear linewhether a particular work to be accepted and rejected. The research was conducted by comparing the results ofcalculation of the aggregate volume between MeTrad and MeVE. The data was collected from Mauponggo-Puuwada road project in Nangakeo in 2010. The results show that there was no difference in the volumescalculated using both methods. The volume of Class B aggregate based on MeTrad calculation is 386.01m 3andthe volume based on MeVE is 386.01m3; where 16.67m3 of which (3.34% of the planned volume) is in the rangeof acceptance and 369.34m3 of which (73.94% of the planned volume)is the volume that is rejected (error). Theresults suggest that MeTrad cannot distinguish clearly whether the work is within the limits of acceptance orrejection, while on the other hand MeVE can describe in detail parts of the work to be accepted or rejected.Using this MeVE calculation, an assessment of a construction workis expected to be more objective anddetailed.

Pengembangan Perangkat Lunak Untuk Gerbang Tol Otomatis Yang Ramah Lingkungan Berbasis RFID Dengan Notifikasi Pembayaran Tanpa Kertas Syafei, Wahyul Amien; Listyono, A. F.; Prayogi, A. S.; Darjat, Darjat; Hidayatno, Achmad
TEKNIK Vol 40, No. 1 (2019): Mei 2019
Publisher : Diponegoro University

Penelitian ini bertujuan untuk mengembangkan purwarupa sistem gardu tol yang ramah lingkungan. Sistem ini menggunakan teknologi RFID untuk mengidentifikasi pengguna sebagai pengganti kartu debit. Kendaraan diidentifikasi oleh sistem ketika melewati gardu tol. Pembayaran dilakukan tanpa perlu memberhentikan kendaraan. Notifikasi pembayaran dikirim melalui SMS secara otomatis oleh sistem ke telepon genggam pengguna. Purwarupa ini dirancang untuk mengeliminasi antrean dan sampah kertas di gardu tol sehingga menghemat waktu, bahan bakar, biaya penyediaan kertas dan tinta. Paper ini menyajikan pengembangan perangkat lunak dari sistem gardu tol otomatis ramah lingkungan yang diusulkan.

PENGARUH PENGGUNAAN SERAT KULIT ROTAN SEBAGAI PENGUAT PADA KOMPOSIT POLIMER DENGAN MATRIKS POLYESTER YUKALAC 157 TERHADAP KEKUATAN TARIK DAN DAN TEKUK Jokosisworo, Sarjito
TEKNIK Volume 30, Nomor 3, Tahun 2009
Publisher : Diponegoro University

This time, rattan bark fiberâ€™s used in furniture industries and home industries because it is easy to get, cheap,not to be danger for our health, and it can lesson environment pollution (biodegradability); so, with exploit ascomposites lasing fibre, later, it can overcome the environment problem. The rattan bark development ascomposite material has already know, in view of the raw material of natural fibre (rattan) available, Indonesiahas many raw material. From this case, this research conducted to get technical analysis of tensile strength andbending from rattan bark fibre composite that is using woven roving treatment of variation matting pattern onfibre direction 0Âº/90Âº and 45Âº angles as polyester resin matrix.The purpose of this research is: to identify the tensile strength and bending of composite of rattan bark fibrewhich influence fibre direction between 0Âº/90Âº and 45Âº angles. From the result of specimen trial is served intensile strength and bending, and compared with tensile strength and bending value which permitted by BKI (Biro Klasifikasi Indonesia) as theory of standardization trial. On the research, the writer found composite thathave rattan bark fibre compared 0Âº/90Âº and 45Âº angle of fibre direction, the treatment of matting pattern fibre,volume fraction 42,8% matrix polyester and 57,2% rattan bark fibre to specimen of tensile strength trial,volume fraction 50% matrix polyester and 50% rattan bark fibre to specimen bending trials. Conducted handlay up method, from the result study found the price maximum of tensile strength has got by composite with0Âº/90Âº and 45Âº fibre direction and maximum bending has got by composite with 45Âº fibre direction.

PERENCANAAN DAN PENGANGGARAN KAMPUS BERKELANJUTAN: GREEN CAMPUS UNIVERSITAS DIPONEGORO Hapsari, Irma Dewi; Sumarjiyanto BM, Nugroho; Purwanti, Evi Yulia
TEKNIK Vol 35, No 2 (2014): (Desember 2014)
Publisher : Diponegoro University

Green campus adalah sistem pendidikan, penelitian, dan pengabdian masyarakat yang ramah lingkungan serta melibatkan warga kampus dalam aktifitas lingkungan yang dapat memberikan manfaat positif bagi lingkungan, ekonomi, dan sosial. Tujuan penelitian ini adalah: (1) Menganalisis penerapan green campus di Undip berdasarkan tiga dimensi utama pembangunan berkelanjutan yaitu lingkungan, ekonomi, dan sosial; (2) Menentukan alternatif strategi kebijakan yang terbaik dalam penerapan green campus di Undip untuk terciptanya kampus Undip yang berkelanjutan; serta (3) Membuat perencanaan anggaran keberlanjutan kampus Undip. Metode analisis yang digunakan adalah analisis deskriptif kualitatif dan kuantitatif. Alat analisis yang digunakan adalah metode Analytical Hierarchy Process (AHP) dengan bantuan Expert Choice versi 11. Berdasarkan hasil analisis bahwa penerapan green campus di Undip sudah dilakukan dengan baik, tetapi belum diintegrasikan secara menyeluruh. Kebijakan-kebijakan yang dilakukan oleh Undip, secara keseluruhan belum dapat memberikan manfaat positif bagi lingkungan, ekonomi, dan sosial, sehingga kampus Undip belum dapat dikatakan sebagai kampus yang berkelanjutan.[Planning and Budgeting of Green Campus Diponegoro University] Green campus are system of education, research, and community service with environment-friendly and engaging the campus community in environmental activities that can provide positive benefits for the environment, economic, and social. The purpose of this study is: (1) analyze the application of a green campus in Undip based on three main dimensions of sustainable development, namely environmental, economic, and social; (2) Determine the best alternative policy strategies in the implementation of a green campus at Undip for the creation of a sustainable campus; and (3) Make a budget plan Undip campus sustainability. The analytical method used are descriptive qualitative and quantitative analysis. The analytical tool used is Analytical Hierarchy Process (AHP) with Expert Choice version 11. Based on the analysis that the implementation of green campus in Undip have done well, but has not been integrated thoroughly. Policies undertaken by Undip, have generally not been able to provide positive benefits for the environment, economy, and social, so Undip can not be said as a sustainable campus.Copyright (c) 2014 by Fakultas Teknik, Undip. All right reserved.Â

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