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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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Back-matter & Author Guidelines Tudjono, Sri
TEKNIK Vol 35, No 2 (2014): (Desember 2014)
Publisher : Diponegoro University

STUDY OF THE PIEZOMETRIC SURFACE AND HYDROCOMPACTION AT CONFINED AQUIFER CAUSED THE LAND SUBSIDENCE IN SEMARANG Fahrudin, Fahrudin; Najib, Najib
TEKNIK Volume 32, Nomor 1, Tahun 2011
Publisher : Diponegoro University

Semarang city has experienced of the land subsidence that be caused by intake groundwater in confined aquiferabundant. The land subsidence happened during range of time 20 years, itâ€™s critical boundary so that result theenvironmental damage. Hence needed a study of cause of the land subsidence. This study aim to know theposition of piezometric surface and also explain the mechanism hydrogeology when happened the landsubsidence. The study of spreading aquifer has been done by the analysis of secondary data which is in the formof drilling log data, piezometric surface and soil mechanics test obtained from PLG (Environmental Center ofGeology) Bandung. Later then, between the land subsidence and piezometric surface be overlay becamezonation. From the data made a analysis of cause of the land subsidence. This aquifer has the land subsidence.The land subsidence explainable with the experienced phenomenon fact for example degradation of piezometricsurface at confined aquifer and process of hydrocompaction. That process influenced by two factors that areassess the pore number (e) and specific gravity (Gs). The degradation of piezometric surface formed the trapezeof water table until 20 m from sea level with the mean 0.7 - 1.1 m/year. Hydrocompaction cause the degradationof number of mean pore 0.145 - 0.5 and specific gravity 0.009 - 0.073 . The degradation of piezometric surfaceand process the hydrocompaction cause the fast of land subsidence around 0.5 - 1.75 cm/year.

PENENTUAN KONDISI OPERASI OPTIMAL PADA PENYULINGAN MINYAK NILAM Setyoko, Bambang
TEKNIK Volume 28, Nomor 1, Tahun 2007
Publisher : Diponegoro University

Patchauly distillation is a process where oil can exctract from patcahaulyâ€™s leaf, branch, stem and root.Patchaulyâ€™s branch, stem and root had randement lower than patchaulyâ€™s leaf.This research used vacuum distillation methode at low temperature and low pressure. The experiment wasdone repeatedly at different pressure and temperature. Than experimentâ€™s data was analysed in laboratoryand compared than standard.The highest purity of patchauly oil is 28 %, efficiency 2,5 % at temperature 80oC and used pressure -50 cmHg

Analisis Level Kesiapan Warga Menghadapi Potensi Bencana Longsor Kota Semarang Susanto, Novie; Putranto, Thomas Triadi
TEKNIK Vol 37, No 2 (2016): (Desember 2016)
Publisher : Diponegoro University

Semarang memiliki morfologi bervariasi yang berpotensi terhadap bencana tanah longsor. Daerah rawan longsor ini mengakibatkan kerugian yang tidak sedikit baik sisi ekonomi sosial seperti bangunan (vihara, talud, rumah dan sebagainya) maupun nyawa manusia. Dalam hal ini manusia banyak dirugikan meskipun aktivitas manusia juga terdeteksi sebagai salah satu penyebab utama terjadinya bencana longsor. Untuk mengurangi kerugian yang mungkin ditimbulkan oleh bencana longsor di Kota Semarang perlu diketahui status kesiapsiagaan warga sehingga prioritas sosialisasi dan intervensi dapat terarah dengan baik. Metode yang digunakan dalam penelitian ini adalah mengukur indeks kesiapsiagaan warga di 19 lokasi titik penelitian rawan bencana longsor. Hasil penelitian menunjukkan secara umum, kesiapsiagaan masyarakat Semarang masuk dalam kategori â€œHampir Siapâ€ dengan nilai indeks 55,74. Terdapat 2 lokasi yang memiliki indeks kesiapsiagaan â€œBelumSiapâ€ yaitu Kembang Arum dan Manyaran. Daerah Mangunharjo berada dalam kategori indeks cukup siap. Ketiga daerah ini berada di daerah dengan tingkat kerawanan cukup tinggi sehingga diprioritaskan untuk mendapatkan sosialisasi dan intervensi yang diperlukan.Â [Title: Analysis of Citizensâ€™ Preparedness Level toward Potency of Landslides Disaster in Semarang City] Semarang has different morphology and by doing so caused a high potential for landslides. This case resulted in the losses of the landslide-prone area both for the social economy such as buildings (temples, embankments, homes, etc.) and human lives. In this case, the man obtained many disadvantages although human activity is also detected as one of the main causes of the landslide. To reduce the losses, it is needed to know the status of citizensâ€™ preparedness so that the priority of socialization and interventions can be targeted properly. The method used in this study is the measurement of the preparedness index of residents in 19 locations of landslides-prone areas. The results showed in general, the community preparedness Semarang in the category "Almost Ready" with an index value of 55.74. There are two locations that have an index of preparedness "Not Ready" namely Kembang Arum and Manyaran. Mangunharjo area is in the category of the index â€œQuite Readyâ€. Those areas are located in areas with fairly high degree of vulnerability. So they areÂ prioritized for the socialization and the interventions.

PREDIKSI TEMPERATUR RESERVOAR PANASBUMI DENGAN MENGGUNAKAN METODA GEOTERMOMETER KIMIA FLUIDA Aribowo, Yoga
TEKNIK Volume 32, Nomor 3, Tahun 2011
Publisher : Diponegoro University

In the preliminary study of Geothermal field development, one the most important thing to observe istemperature capacity of the geothermal reservoirs. One of several method to get subsurface temperature datathat low cost and reliable is geothermometry method. With just surface investigation of the geothermal prospectand fluid geochemistry analysis, it is possible to make a prediction how hot reservoir fluids are. The subsurfacetemperature prediction is based on physical and chemical properties of some chemical constituent. Temperaturedependant solubility of many chemical consituent of geothermal fluids such as silica, chloride, and Na.

MODEL OPTIMASI LOKASI POS PEMADAM KEBAKARAN (Studi Kasus: Kota Semarang) Bagir, Mohamad; Buchori, Imam
TEKNIK Volume 33, Nomor 1, Tahun 2012
Publisher : Diponegoro University

Fire is one of the hazards that often occur in urban areas. Many Indonesian cities usually lack of adequatepublic facilities and infrastructures, including facilities of fire hazard. It is important to reduce the risk of firehazard by optimizing the location of fire stations as facility of emergency around the city, so that the impact oflosses can be reduced. For this, defining the location and distribution of fire station should be well considered.This paper aims to discuss the development of an optimization model for fire stationsâ€™ location, developed basedon the actual quantity of flammable material, building density, accessibility and the road classes, as a networkanalysis model of Geographic Information System (GIS). In order to observe whether the developed model canwork well, Semarang City is selected as the case study.The application shows that the developed model is satisfy and is able to represent 77.29% of the real conditionof the road network. It is also revealed that the fire stations of Semarang City just presently cover 34.32% of itsarea. Therefore, it is suggested to add six new fire stations, located in Kecamatan Ngadirejo, Tlogo Mulyo,Sambiroto, Pudak Payung, Jatingaleh, and Gunungpati.

Optimasi Distribusi Lubang Pada Balok Baja Kastela Partono, Windu; Sukamta, Sukamta; Hardiyati, Siti; Budi, Listiyono
TEKNIK Vol 39, No 1 (2018): (July 2018)
Publisher : Diponegoro University

Balok baja kastela adalah profil baja yang dikembangkan dari profil I yang dipotong bagian badan dan disambung lagi sedemikian rupa sehingga membentuk lubang pada bagian badan.Â Bentuk lubang profil balok baja kastela pada umumnya adalah persegi enam (heksagonal). Pembuatan balok baja kastela perlu memperhatikan jarak antar lubang agar balok mempunyai kemampuan menahan beban tertinggi. Tulisan ini menyajikan hasil penelitian untuk menentukan jarak antar lubang yang optimum pada balok baja kastela dengan mempertimbangkan distribusi tegangan, deformasi, dan kelelehan pada balok tersebut. Penelitian diawali dengan perhitungan menggunakan metode Elemen Elemen Hingga (Finite Element Method /FEM) kemudian dilanjut dengan pengujian di laboratorium. FEM dilakukan untuk menentukan ukuran dan jarak antar lubang optimum pada balok kastela. Variasi sudut bukaan lubang dilakukan antara 45o sampai 70o. Hasil analisis FEM kemudian diujikan di laboratorium dengan ukuran dan jarak antar lubang optimum untuk mengevaluasi perbedaan hasilnya. Hasil penelitian menunjukkan lubang profil dengan kemiringan antara 45o sampai 70o sebaiknya dibuat dengan jarak antar lubang antara 0.1 sampai 0.25 dari tinggi profil balok kastela dengan distribusi lubang terbaik adalah antara 5 sampai 7 lubang per meter.

STUDI PERENCANAAN SISTEM UNTUK PENDUKUNG KEPUTUSAN PROYEK KAPAL BANGUNAN BARU Suyadi, Suyadi
TEKNIK Volume 30, Nomor 1, Tahun 2009
Publisher : Diponegoro University

Since Presidential decree No 5 2005 on the empowerment of the Indonesian shipping industry applies, theIndonesian shipbuilding industry has officially gained support from the Indonesian government to be able tocompete in the national as well as international market. Along with the globalization era and a lot ofshipbuilding orders, the shipyard management has to do some improvement to the shipyard to be morecompetitive. One of efforts that should be done is by improving the management of incoming orders. This isvery important to do because during this time the shipyard management has to collect a lot of informationfrom departments in the shipyard manually to consider accepted shipbuilding orders.In this paper, a new model to manage new shipbuilding orders is developed. The model is implementedwithin a computer-based decision support system that is related to an existing system of production, planningand control in the shipyard. The approach used in the development of this system is ROMC (Representation,Operation, Memory Aids and Control Mechanism).The aim of the developed decision support system is to assist all decision makers in defining problems,developing alternative solution; , and chosing various alternative decisions in the system development thereare three steps to be done : (i) building data base, (ii) building model base, and (iii) building dialogue base

PENGARUH KARAKTERISTIK KARYA YB. MANGUNWIJAYA TERHADAP KARAKTER VISUAL PERMUKIMAN BANTARAN SUNGAI STUDI KASUS: KAMPUNG CODE UTARA, YOGYAKARTA Puspitasari, Ayu Wandira; Pandelaki, Edward Endrianto; Setioko, Bambang
TEKNIK Volume 34, Nomor 2, Tahun 2013
Publisher : Diponegoro University

Settlement of north Kampung Code which located on the riverbanks of Kali Code in Yogyakarta, has a diversevisual character, so that visually appear to be dynamic and irregular.Yusuf Bilyarta Mangunwijaya participatefully in shaping the visual character of the settlement of the north Kampung Code. The aim of this research is toknow the effect of characteristics design of YB. Mangunwijaya on the visual character of settlement riverbank inthe North Kampung Code.Quantitative-rasionalistic method was used in this research, based on the results of respondents answer inobservation the visual character of the north Kampung Code settlement. Testing using the test statistic basedfrom the answer of the respondents to the questionnaire. Quantitatively, the study was determined using outputrating statistics. Then the hypothesis testing was done through a linear regression analysis which serves toidentity that effect. Test conducted on the variable of characteristics design of Mangunwijaya consists of unitedwith nature, local, efficient, honest, detail and creative.The conclusions is a significant effect the characteristics design of YB. Mangunwijay on the visual character ofthe north Kampung Code was shown in this work.Correlation between respondents answer with theoryexplanation. Interpretation of this research was not every factor in forming the visual character can beunderstood properly by the observer.Key words: Visual Character, Characteristics Effect, The North Kampung Code, YB. Mangunwijaya

KAJIAN STABILITAS TUMPUKAN BATU DALAM AIR Samto Atmojo, Pranoto
TEKNIK Volume 29, Nomor 1, Tahun 2008
Publisher : Diponegoro University

Rock fill Dam, Coffer Dam, Groyne, Railway are example of structures composed by stone material. Rockfill structures are commonly stable enough, but when thatâ€™s constructed in under water, than stability ofstructure will decrease significant. Stability of stone structure under water actually depend on by somevariable these are depth of flooding, size or dimension, and stone position. The Author here will show withRail way stabilities calculation for example. Trial by two level position of flooding ,assume diameter stoneand gated value of properties , the result is stone with diameter 12 cm, will scour by less than 20 cm underwater. The Stone will scours by the flowing water if the velocity of water (Va) bigger than Critical velocityof the stone (Ucr). At the reality, rail way structured by stone with variation size more or less from 5 to 12cm, and depth of flooding possible occur more than 20 cm. So, rail way potential hanging cause of stonesupporting scour by flooding however only 10 cm depth. Calculation of stone stabilities used after Isbash,Goncharov,Levi dan Maynord formulae.

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