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TEKNIK

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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Ucapan Terima Kasih kepada Mitra Bebestari (Reviewer) Istadi, Istadi
TEKNIK Vol 35, No 1 (2014): (July 2014)
Publisher : Diponegoro University

MODEL SISTEM PENUNJANG KEPUTUSAN (DECISION SUPPORT SYSTEM MODEL) UNTUK PERENCANAAN PENGELOLAAN WILAYAH SUNGAI SESUAI UU 7/2004 Darsono, Suseno; S.A., Pranoto
TEKNIK Volume 29, Nomor 3, Tahun 2008
Publisher : Diponegoro University

Total population increase therefore water supply requirement, irrigation water, as well as requirement ofresidential areas are also increase. Many ways in development of water resources management arerequired to fulfill future water requirement, and need minimizing land use changes. Integrated waterresources management planning based on river basins is required. Polices for water resourcesconservation program, exploitation of water resources and control of the waterâ€™s destructive force arerequired for optimizing water resources management. A holistic water resources management is requiredfor protecting, maintaining as well as increasing the value of water resources. According to WaterResources Law No. 7 year 2004, a water resources planning for a river basin has to prepare withparticipation of some stakeholders. Many program alternatives of water resources management will beproduced from a water resources management planning process. Thus, the ranking analysis of alternativeprograms needs to be proceeded. Decision Support System (DSS) with weighting optimization model is atool for helping to determine the rank of water resources development programs. The DSS technique needscriteria as basic for prioritizing water resources development programs. Determination weight for eachcriterion and score for each alternative water resources development program are required. Applicationof this model is a priority analysis of water resources development program from JRATUNSELUNA riverbasin for administration district Jepara, Kudus and Demak

Perbandingan Karakteristik Lempung Kasongan dan Godean Sebagai Bahan Baku Industri Gerabah Kasongan Winarno, Tri
TEKNIK Vol 37, No 1 (2016): (Juli 2016)
Publisher : Diponegoro University

Kasongan adalah salah satu sentra industri keramik dan gerabah di Yogyakarta yang terletak di Desa Bangunjiwo, Kecamatan Kasihan, Kabupaten Bantul. Pada saat ini industri keramik dan gerabah Kasongan mengalami kesulitan bahan baku lempung dikarenakan cadangan lempung di Desa Bangunjiwo yang selama ini digunakan semakin berkurang jumlahnya. Berdasarkan studi pustaka diketahui bahwa di Godean terdapat cadangan lempung, sehingga perlu diteliti apakah bisa digunakan sebagai bahan baku dalam industri keramik dan gerabah. Metode yang digunakan untuk menguji karakteristik lempung tersebut adalah dengan analisis XRD, XRF, analisis tingkat kecerahan, analisis ukuran butir dan pengujian pembuatan gerabah dari lempung tersebut. Hasil penelitian menunjukkan mineral lempung penyusun lempung Bangunjiwo adalah kaolinit dan haloisit, sedangkan di Godean terususun atas kaolinit, haloisit dan smektit. Dalam pengujian pembuatan gerabah dengan lempung dari kedua daerah tersebut menunjukkan perbedaan hasil, dimana lempung dari Godean menghasilkan gerabah yang tidak menyerupai ciri khas gerabah Kasongan yang berwarna merah terang. Dengan demikian lempung dari Godean tidak bisa digunakan sebagai pengganti bahan baku industri gerabah Kasongan. [Title: The Characteristic Comparison of Kasongan Clay and Godean Clay as Raw Material in Kasongan pottery Industry] Kasongan is the center of ceramics and pottery industry in Yogyakarta,located in Bangunjiwo village, Kasihan District, Bantul Regency. Nowadays, the ceramics and pottery industry is difficult to find the raw material because of the decrease of the Bangunjiwo clay deposit. Based on literature review, there are clay deposits found in Godean which can be observed their characteristics as basic commodity in the ceramics and pottery industry. The methods apllied in this research are XRD and XRF analysis,brightness analysis, grain size analysis and making pottery from those clays.The result of the research shows that the clay in Bangunjiwo consists of kaolinite and halloysite, while clay in Godean consists of kaolinite, halloysite and smectite. The pottery products made from those clays show different characteristics. The clay from Godean does not show bright red colour as the Kasongan clay. So the clay from Godean can not be used as the alternative raw material for the Kasongan pottery industry. Â

BAHAYA TEKUK PONDASI TIANG LANGSING DALAM TANAH LUNAK KOHESIF Dwi Atmanto, Indrastono
TEKNIK Volume 32, Nomor 3, Tahun 2011
Publisher : Diponegoro University

This paper treats the buckling of slender piles completely embedded in soft cohesive soils. Usually these soilswere assumed to behave elastically and were theoretically replaced by horizontal springs supporting the piles.However, soft soils deform as plastic materials. Therefore, it is suggested to assume a lateral supportindependent of the amount of the lateral displacement and accordingly to calculate a model; hereby the safetyagainst buckling of the piles is computed. It is shown that an ideally straight, centrally loaded pile does notbuckle until the stresses in the pile material exceed the elastic range. The shape of the pile axis, however, is mostimportant. Only a very little deviation from a straight line, because the pile is bent elastically or stressles, causesa rapid decrease of the maximum pile-load in dependency of the shear resistance of the soils with the increase ofthe deviation. The proposed model is also applied for eccentrically piles, i.e. a vertical load as well as a bendingmoment act on the pile top

TEKNIK PEMINJAMAN KANAL DENGAN METODE BDCL ((BORROWING WITH DIRECTIONAL CHANNEL-LOCKING) PADA SISTEM KOMUNIKASI SELULER Ajulian Zahra M, Ajub
TEKNIK Volume 28, Nomor 3, Tahun 2007
Publisher : Diponegoro University

The cellular mobile mobile telephone system has found important applications in metropolitant areas. ItsÂ different types of channel assignment schemes has been adopted in many cellular systems. Â To satisfy the highÂ demand of mobile telephone service channel needs to be reused in different noninterfering cells. In the fixedÂ assignment strategy, a set of nominal channels is permanently assigned to each cells, and the same set ofÂ channels is reused some distance away. That distance is called the cochannel reuse distance. Using the fixedÂ channel assignment strategy, an arriving call can only be served by the nominally assigned channels. If allÂ nominal channels are assigned, new calls are blocked. Â Â Â Borrowing channel assignment (BCA) is the simplest Â allocation scheme. In borrowing channel assignment,Â channel assignment is initially fixed that is a channel set is preassigned to each cell. If there are Â incomingÂ calls to a cell whose channels are all occupied, the cell borrows channels Â from its neighboring cells under theÂ constraint of no interference. When Â a channel is borrowed, several other cells are not allowed to use thatÂ channel. In this final project two channel assignment Â strategies are proposed. They are the borrowing withÂ directional channel-locking and Â the fixed channel Â assignment. BDCL performance is compared with fixedÂ channel assignment (FCA). In this borrowing with directional channel-locking (BDCL), when a channel isÂ borrowed, the locking of this channel in the cochannel is restricted only those affected by this borrowing.. Â Â Â Â In this final project the simulated Â cellular systems contains 49 hexagonal cells all cells with eight nominalÂ channel. The simulation shows that with the newly proposed BDCL strategy can give a lower lower blockingÂ probability than FCA under nonuniform traffic distribution.

Mekanisme Kebijakan Standard Ketahanan Gempa Baru pada Bangunan Publik Hermawan, Ferry; Indarto, Himawan
TEKNIK Vol 38, No 2 (2017): (Desember 2017)
Publisher : Diponegoro University

Penerapan standard bangunan tahan gempa baru pada penelitian ini adalah bagian dari mekanisme kebijakan teknis dan harmonisasi kepentingan dari para praktisi gedung di daerah. Persoalan teknis di lapangan menuntut adanya integrasi komitmen antara praktisi gedung dan pemilik proyek. Jika suatu penerapan standard bangunan terjadi saat gedung sedang dibangun maka perlu mekanisme kebijakan yang dapat mengharmonisasi kepentingan teknis dan administrasi proyek. Penelitian ini merupakan bukti empirik bagaimana mekanisme kebijakan retrofit bangunan pasca penerapan SNI bangunan tahan gempa baru diterapkan pada bangunan rumah sakit umum di Jawa Barat. Metode penelitian yang digunakan adalah menggunakan simulasi model struktur dan wawancara semi-structured dengan enam praktisi gedung yang telah berpengalaman antara 15-25 tahun. Hasil simulasi model struktur diperoleh bahwa beberapa elemen struktur harus dilakukan retrofit untuk meningkatkan kapasitas terhadap beban gempa baru yang relatif meningkat dua kalinya dari standar gempa lama. Hasil penelitian menunjukkan bahwa, keberhasilan penerapan standard gedung tahan gempa baru dipengaruhi oleh mekanisme komunikasi dan pengalaman kontraktor yang memadai pada eksekusi di lokasi. Interaksi antara pemilik proyek, kontraktor, dan tim manajemen konstruksi adalah bentuk mekanisme yang bisa dikembangkan terutama bagi praktisi gedung di daerah dengan keterbatasan sumber daya teknologi dan keterampilan.

PEMISAHAN LARUTAN MENJADI FRAKSI-FRAKSINYA MENGGUNAKAN KHROMATOGRAFI ANNULAR KONTINYU S Retnowati, Diah
TEKNIK Volume 30, Nomor 1, Tahun 2009
Publisher : Diponegoro University

Chromatography can be used for analysis or separation. This review describes continuous annularchromatography for separation of enantiomers or isomers. These type molecules are hardly separatedwith conventional separation, and therefore need a good separation method. Continuous AnnularChromatography consists of a rotating annular bed. The annulus is formed between two concentriccylinders, and the resin is packed in the annulus. At fix position at the top of the bed, four solutions arecontinuously fed, the feed mixture to be separated, a displacer solution, a regenerant and a rinse. TheAnnulus is slowly rotated with the result that different zones will formed helices of characteristic anglewhich can be collected at variations fixed points around the bottom of the bed.

PERBANDINGAN EFEKTIFITAS HASIL PENGGELONTORAN SEDIMEN DI WADUK CARA FLUSHING DAN SLUICING Atmodjo, Pranoto S.; Sangkawati, Sri; Kirno, Kirno
TEKNIK Volume 34, Nomor 2, Tahun 2013
Publisher : Diponegoro University

This study compares the effectiveness of the flushing of sediment in the reservoir by means of flushing andSluicing way, based on Physical Hydraulic Test (Model Test) in the laboratory. Flushing is removingaccumulated deposited sediment. While slucing is releasing of sediment through the reservoir beforesettled or keep sediment remain in suspension and its occur during flood period. Sediments FlushEffectiveness represented by the percentage of released sediment by sediment deposited or the amount ofsediment entering the reservoir during the flushing period.The model based on the prototipe from DetailDesign of Structural Countermeasures for Sedimentation on Wonogiri Reservoir by Nippon Koei 2009.Running model duration is one hour, used free flow and submergence condition, with discharge variationQ=100, 200 and 400 m3/s. Sluicing experiments conducted with some 60 liters of sediment sprinkle evenlywide flow, and Flushing implemented by 2,00 m thickness of deposited sediment that spreaded over thereservoir bottom before running. From this research showed that Sluicing way more efficient than theflushing way, where the number of efficiency of sediment Sluicing way bigger than the efficiency offlusing way, in the running an hour in the laboratory test

Analisis Kualitas Isolasi Minyak Transformator 375 MVA dengan Interpretasi Rasio Roger, Segitiga Duval, Breakdown Test, dan Water Content Test Syakur, Abdul; Lazuardi, Wildan
TEKNIK Vol 40, No. 1 (2019): Mei 2019
Publisher : Diponegoro University

Transformator merupakan peralatan utama dalam pemasokan listrik dari unit pembangkitan menuju konsumen. Oleh karena itu, perlu perhatian khusus dalam pemeliharaan kinerja transformator agar tidak terjadi kerusakan pada transformator. Selama trasformator beroperasi maka minyak transformator akan mengalami pembebanan berupa beban elektris dan termal yang dapat menyebabkan timbulnya gas-gas hidrokarbon terlarut pada minyak yang berpotensi menyebabkan gagalnya minyak sebagai fungsi isolasi yang baik. Karenanya diperlukan pemantauan khusus terhadap gas-gas tersebut. Salah satu cara untuk menganalisis gas terlarut dalam minyak adalah dengan menggunakan metode Dissolved Gas Analysis (DGA). DGA akan mengekstraksi gas tersebut untuk diketahui indikasi gangguan berdasarkan hasil interpretasi data gas-gas hidrokarbon terlarut yang dilakukan. Metode ini juga mampu memprediksi kerusakan jangka panjang, sehingga kerusakan pada transformator dapat dicegah. Hasil analisis DGA pada transformator menghasilkan indikasi berupa Discharge of thermal fault yang didapat dari hasil intrepetasi data menggunakan metode Rasio Roger dan Segitiga Duval. Selain itu, hasil pengujian breakdown voltage menunjukkan kondisi minyak yang masih baik yaitu kekuatan dielektrik > 50 kv dan pengukuran water content juga masih baik yaitu sebesar < 25 ppm.

THE PERFORMANCE OF REVERSE OSMOSIS MEMBRANE IN WATER TREATMENT Budiyono, Budiyono; Buchori, Luqman
TEKNIK Volume 29, Nomor 1, Tahun 2008
Publisher : Diponegoro University

Membrane technology has led to a new focus on water and wastewater treatment. This is due to severaldrawback of the conventional water treatment i.e release the toxic and carcinogenic materials. In thisresearch, the use Reverse Osmosis (RO) membrane for treating river and well water to obtain clean anddrinking water was studied. The variables studied were effect of pressure and operation time to themembrane flux. The pressure was varied from 1 to 7 bar and the operation time was varied from 15 to 60minutes. The content of Total Dissolved Solid (TDS) in the permeate product was analyzed. The resultsshown that the increase of pressure would increase the membrane flux and decrease TDS. The increaseof the operation time would decrease membrane flux and TDS. The reverse osmosis membrane wassuccessfully applied to treat the river and well water. The product fulfill national standard quality ofdrinking water by viewpoint of the TDS content

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