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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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APLIKASI METODE GEOMAGNET DALAM EKSPLORASI PANASBUMI Broto, Sudaryo
TEKNIK Volume 32, Nomor 1, Tahun 2011
Publisher : Diponegoro University

Geophysics is a part of earth science that studies the Earth using the rules or principles of physics. Geophysicalmethods are divided into several methods, namely: gravity method, geomagnet, seismic, geoelectric andgeoradar.Geothermal energy is stored in the form of hot water or steam at a certain geological conditions at depth.Geothermal system is an area of geothermal or geothermal field is an area on the surface of the earth within acertain limit where there is geothermal energy in a certain rock hydrology. Geothermal manifestations consistof: ground hot, steaming ground, hot tubs, hot mud pools, hot springs, fumaroles, geysers, silica sinter.Fault is a fracture rock mass shift relative one part against another. Fault structure is associated withgeothermal manifestations, because the manifestations that came out to the surface because of the fault beneaththe surface.From the results of investigations in the area geomagnet Jaboi, magnetic anomalies were divided into three,namely anomaly is very low with values between -600s/d200 nT anomaly as strongly altered rock and weatheredrock; low anomaly with values> -200s/d300 nT as alluvial and pyroclastic rocks ; high anomaly with valuesbetween> 300s/d700 nT as a rock rhiolit / dacite volcanic and fresh. Geothermal potential area is the area oflow magnetic anomaly values in the presence of manifestations of hot water and is controlled by the fault.

MESIN PENGERING KAYU SEDERHANA UNTUK HOME INDUSTRI Murni, Murni
TEKNIK Volume 28, Nomor 1, Tahun 2007
Publisher : Diponegoro University

Dryer machine of wood is made to fulfill need of wood in order to produce raw of drying wood is notdepended weather. Making of dryer of wood usually requiree investment cost more expensive . it is heavyfor home industry .Inovation of simple dryer machine is done with flowing steam naturally and base onanalyzing it shows that drying can achieve moistur content 12 persen

Penyisihan Limbah Organik Air Lindi TPA Jatibarang Menggunakan Koagulasi-Flokulasi Kimia Rezagama, Arya; Hadiwidodo, Mochtar; Purwono, Purwono; Ramadhani, Nurul Fajri; Yustika, Mia
TEKNIK Vol 37, No 2 (2016): (Desember 2016)
Publisher : Diponegoro University

Air lindi yang meresap ke dalam tanah yang berpotensi bercampur dengan air tanah sehingga menimbulkan pencemaran tanah, air tanah dan air permukaan. Komposisi limbah lindi dari berbagai TPA berbeda-beda bergantung pada musim, jenis limbah, umur TPA. Proses dalam TPA menghasilkan molekul organik recalcitrant yang ditunjukkan dengan rendahnya rasio BOD/COD dan tingginya nilai NH3-N. Belum optimalnya pengolahan air lindi di Jatibarang membutuhkan pretreatment sebagai bentuk upaya alternatif dalam proses pengolahan air lindi sebelum masuk ke dalam proses aerated lagun. Penelitian ini bertujuan untuk menganalisa pengaruh koagulan kimia pada penyisihan bahan organik air lindi TPA Jatibarang. Penelitian dilakukan pada bulan April- Agustus 2016. Karaktersitik air lindi TPA Jatibarang termasuk dalam kategori "moderately stable" dan lindi muda. Penyisihan bahan organik dengan menggunakan kuagulan kimia FeCl3 dan Al2SO4 menunjukkan nilai yang cukup signifikan untuk parameter COD, BOD, TSS. Penggunaan dosis optimal terjadi pada 16 g/L FeCl3 serta 16 g/L Al2SO4 dapat menurunkan nilai COD sebesar 51% dan 65%, BOD sebesar 50% dan 56%, dan TSS sebesar 24% dan 21%. Perubahan nilai pH akibat penambahan koagulan berpengaruh positif terhadap tingkat penyisihan, namun memberikan dampak negatif yaitu buih yang cukup banyak. Penurunan beban organik menguntungkan bagi sistem pengolahan lindi eksisting TPA Jatibarang.Â [Title: Removal of Lindi Water Organic Waste of TPA Jatibarang using Chemical Coagulation- Floculation] Leachate grounding into the soil that potentially could mix with the groundwater caused contamination of soil, groundwater and surface water. The composition of waste landfill leachate from the various location is depending on the season, the type of waste, and landfill age. Process in the TPA produces recalcitrant organic molecules as indicated by the low ratio of BOD/COD and NH3-N high value. The ineffective treatment of leachate at Jatibarang require a pretreatment as a form of alternative effort in the processing of leachate prior to entry into the aerated lagoon process. This study aims to analyze the influence of chemical coagulants on grounding organic material Jatibarang landfill leachate. The study was conducted in April-August 2016. Jatibarang landfill leachate characteristics were categorized as "moderately stable" and young leachate. Allowance for organic materials using chemical coagulants of FeCl3 and Al2SO4 showed significant values for the parameters of COD, BOD, and TSS. The use of optimal dose occurs at 16 g/L FeCl3 and 16 g/L Al2SO4 which can reduce the COD value by 51% and 65%, BOD by 50% and 56%, and TSS at 24% and 21%. PH value changes due to the addition of coagulant positive effect on the level of the allowance, but a negative effect that is quite a lot of froth. The decline in organic load favorable for existing landfill leachate treatment systems Jatibarang.Â

PENGARUH UKURAN UTAMA KAPAL TERHADAP DISPLACEMENT KAPAL Utomo, Budi
TEKNIK Volume 31, Nomor 1, Tahun 2010
Publisher : Diponegoro University

Displacement is weight water which is replaced ship hull. The displacement influenced by dimension of inmerchant ship. The displacement musat be small as posible, but the capacity and the speed must be pullfill.Dsplacement can be obtained by formulation or by experiment in hydrodinamika laobatory, the modelingcharacteristic us descube the real Calculation of the ship.The form of the ship must give the resistaise as small as posible. In athe hard the capacity must be full fill ofload

STUDI GEOKIMIA AIR PANAS AREA PROSPEK PANASBUMI GUNUNG KENDALISODO KABUPATEN SEMARANG, PROVINSI JAWA TENGAH Aribowo, Yoga; Nurohman, Heri
TEKNIK Volume 33, Nomor 1, Tahun 2012
Publisher : Diponegoro University

Fluid geochemistry is a useful method to analyse lateral and vertical processes and trends in a geothermalsystem, just like a blood and urine analysis to determine the functions of internal organs in human body. Fluidsgeochemistry study in Kendalisodo Geothermal Prospect has conducted to get information about type andcharacteristics of fluids, to predict reservoir temperature, and sub surface hidrogeochemical cycle model.From fluids geochemistry analysis, the most significant constituent is HCO3, and thus all fluids classified intobicarbonate water. Based on gethermometry analysis, the average reservoir temperature calculated is about175oC and classified into medium enthalpy system.

Perbaikan Tanah Lempung Ekspansif Menggunakan Soda Api (NaOH) Pardoyo, Bambang; Wardani, Sri Prabandiyani Retno; Partono, Windu
TEKNIK Vol 39, No 1 (2018): (July 2018)
Publisher : Diponegoro University

An expansive clay is soil material that is composed of various minerals include kaolinite, montmorillonite and illite group. Mineral montmorilinite have the sensitivity to the effects of the water is very easy to swell and shrink. High and low levels of swelling and shrinkage (shrinkage) expansive clay is determined by the high and low content of montmorillonite on expansive clay granules. Because of these properties are very high content of montmorillonite often cause problems in the building. This study uses a solution of Soda Api (NaOH) as a stabilizer through the compaction process Modified Proctor on (OMC + 7,5%) Â Proctor standard by the number of collisions each - each is 10 x, 25x and 56x, and the amount of additional water on weight soil Â dry , with variations in increments of Â water by 95% : 5% NaOH, water by 90%: 10% NaOH and water by 85% : 15% NaOH. This research was conducted testing - testing in the laboratory include: Index properties, Swelling Pressure, Swelling Potential and CBR with curing and no curing. Results - results in these tests show that the value of the property index showed an increase, Test UCS showed an decrease, Test CBR by soaking at the age of 7 days with a mixture of caustic soda 10% showed the best results, while the pressure test expands and Test Potential expands decreased significant.

KUANTITAS DAN KUALITAS RUANG TERBUKA HIJAU DI PERMUKIMAN PERKOTAAN Dwiyanto, Agung
TEKNIK Volume 30, Nomor 2, Tahun 2009
Publisher : Diponegoro University

Green Air-Gap management in area of settlement urban tend to to experience of the challenge which enough weightof effect about height of urbanization current. while on the other side, energy support the downhill existing socialand environment also, so that cannot make balance to the requirement of space of effect about human pressure .Other challenge go together the height mount the conversion or displace to utilize the farm from farm (especiallyagriculture farm become the area develop;builded) generating impact to lowering environmental quality nyabecome green of urban. Evaluate the planology is exist in generally only study the aspect of accuracy or deviation ofspace according about zoning which already specified . Meanwhile its exploiting intensity change seldom debate, sothat need the new stages;steps to improve;repair the quality and existing amount green space.

RANCANG BANGUN ALAT DISTILASI PEMURNIAN BIOETANOL GRADE TEKNIS BERSKALA UKM : KAJIAN KINERJA ALAT TENTANG DERAJAD PEMURNIANNYA Hargono, Hargono; Samodra, Nugraha Bayu; Firdausi, Nadia Zahrotul; Nugraheni, Agnes Kinanthi; Zakaria, Lazuardy R.
TEKNIK Volume 34, Nomor 3, Tahun 2013
Publisher : Diponegoro University

The technical grade bioethanol can be manufactured by using distillation process at small and medium enterprises. In this research, bioethanol was made from fermentation of Â rubber cassava starch (Manihot glaziovii) and gadung starch (Dioscorea hispida). From this fermentation process, 3-8% crude ethanol was produced. To achieve the objective 2-stage distillation units were designed to purify the crude ethanol product. Bioethanol produced from 1st and 2nd distillation units were of 35 and 94% purity respectively corresponding to the technical specifications desired. The design of 2-stage distillation units has been completed, included the shape and dimensions of the units, i.e. the main condenser, cylindrical in shaped, dimensions of diameter was 32cm and height was 45cm, cylindrical in shape Â feeder tank/boiler, small scale volume of 5L, which can be scaled up to 65L. At 2nd distillation column, the diameter was 9cm and length was 121cm. The column was isolated using ori type bamboo filled with glasswool as isolator. The columns were filled with ceramic or glass type packing inside. The columns were equipped with thermometer to measure the temperature of ethanol-water vapor. Key words: crude bioethanol, design of 2-stage distillation, technical grade bioethanol

Analisis Mineralogi dan Kandungan Kimia Endapan Lumpur Sidoarjo dan Arah Pemanfaatannya Winarno, Tri; Gunawan, Yeremia Billy Agustha; Marin, Jenian
TEKNIK Vol 40, No. 2 (2019): Agustus 2019
Publisher : Diponegoro University

Semburan lumpur Sidoarjo mengeluarkan volume sebesar Â±80.000 m3setiap hari dan hanya dapat diatasi Â±60.000 m3 dengan cara mengalirkannya ke laut melalui Kali Porong. Surplus endapan lumpur tersebut meluap dan menggenangi daerah di sekitar pusat semburan lumpur sehingga menimbulkan masalah. Artikel ini memuat analisis mineralogi dan kandungan kimia dari endapan lumpur Sidoarjo sehingga dapat dimanfaatkan sesuai karakteristiknya. Sampel lumpur dinalisa menggunakan metode X-Ray Diffraction (XRD) dan X-Ray Fluorescence (XRF) untuk mengetahui mineralogi dan kandungan kimianya. Genesis dari endapan Lumpur Sidoarjo diinterpretasikan berasal dari batuan sedimen vulkaniklastik Formasi Kalibeng Atas yang bercampur dengan endapan Aluvial (Qa) karena mineral-mineral lempung yang dijumpai didominasi oleh mineral montmorillonit. Keberadaan Zona Sesar Watukosek yang memanjang dari Kompleks Gunungapi Arjuno-Welirang diinterpretasikan memberikan kontrol struktur terhadap pembentukan gunungapi lumpur Sidoarjo. Pemanfaatan endapan Lumpur Sidoarjo berdasarkan mineralogi dan kandungan kimianya dikelompokkan menjadi lima bidang, yaitu kesehatan, pertanian, perikanan, industri, dan kosmetik. Setiap bidang pemanfaatan membutuhkan mineral-mineral lempung khusus sehingga endapan Lumpur Sidoarjo harus diolah terlebih dahulu untuk menghilangkan unsur pengotor, mineral berat, pengecilan ukuran, peningkatan kemampuan absorpsi, dan kapasitas tukar kation.

ANALISIS KUALITAS PENGAMATAN DATA PASUT BERDASARKAN PERBANDINGAN KOMPONEN PASUT DAN SIMPANGAN BAKU Prasetyo, Yudo
TEKNIK Volume 29, Nomor 1, Tahun 2008
Publisher : Diponegoro University

Tide harmonic constanta is 2 kind of constant parameters (amplitude and phase) with periodic phase fromthe truly tide in equilibrium tide. The quality of tide data processing can be look in the standard deviationvalue of tide harmonic constanta. The standard deviation value decreasing is indicate that tide dataprocessing have a good data quality processing, contrary the standard deviation value increasing isindicate that tide data processing have a bad data quality processing. Depend on range of data observationtime (1 month,3 month, 6 month and 1 year), it will compute in 7 tide harmonic constanta to compare tidedata processing quality. It will compare using amplitude and phase standard deviation which is show thetide data processing quality. This analysis have function to prove that the range of data observation timehave a significant influence in a tide data processing.

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