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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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RANCANG BANGUN KOTAK PENYIMPAN IKAN BERINSULASI UNTUK MEMPERTAHANKAN KUALITAS IKAN DENGAN PROSES PENDINGINAN SERTA APLIKASINYA PADA IKAN TONGKOL (AUXIS THAZARD) Tuti Susanti, Margaretha; Purba, Parhimpunan
TEKNIK Volume 29, Nomor 2, Tahun 2008
Publisher : Diponegoro University

Fish Cooler Box Have Designed With Measurement 50 X 70 X 40 Cm, with layers box wall and the partfrom out box : fiber glass, strerofoam wood and fiber glass. The boxes will be aplicate for tongkol fish(Auxis thazard) preservation. Variation that done in this research is comparation between ice and fish.topreservation times. Parameter that measured are fish quality like : fat degradation with TMA method,protein degradation with TVB method, rotten with TMAO method, and organoleptic test like : smell,appearence, texture. Result of this research with that parameter tests are : comparation between ice andfish 2:1, but with comparation 1:1 fish quality is still good for consumption

DESAIN APLIKASI SIG UNTUK PELAYANAN JARINGAN PIPA PDAM ( Studi Kasus : Jaringan Pipa PDAM Demak ) Laila Nugraha, Arief; Haniâ€™ah, Haniâ€™ah
TEKNIK Volume 32, Nomor 2, Tahun 2011
Publisher : Diponegoro University

Regional water treatment and supply company (PDAM) Demak city is water utility service provider for Demakpeople. This company is one of important regional state enterprise to increase income regional of Demak City.PDAM as companies service must be build up the system that can be satisfied his consuments. One of the systemis Geographics Information System (GIS) Pipeline Aplication. The system is integrate Global Positioning System(GPS) that can knows real position pipeline routes, and programming GIS application that can makes the systemcan be operated user easily. The goal of the system is can calls back geodata of pipeline that be needed forPDAM to serve his consuments and knows area that can be covered existing pipeline routes.

STUDI POTENSI PEMANFAATAN NILAI EKONOMI SAMPAH ANORGANIK MELALUI KONSEP DAUR ULANG DALAM RANGKA OPTIMALISASI PENGELOLAAN SAMPAH (Studi Kasus : Kota Magelang) Dwi Nugraha, Winardi; Ambun Suri, Denok; Syafrudin, Syafrudin
TEKNIK Volume 28, Nomor 1, Tahun 2007
Publisher : Diponegoro University

Waste composition of Magelang City in the year of 2006 consists of 69, 65% organic waste and inorganicwaste 30, 35%. This composition indicates that Magelang City have potency to lessen its waste by applying3R concept and by optimizing the role of trash collector in managing inorganic waste. The existing wastemanagement condition shows that organic and inorganic wastes are not separated yet from its source. As aresult, inorganic waste (which is still economically valuable and still can be recycled) was brought to TPS.The target of this research is to find the waste amount and potency that can be recycled. These resultcontinued by planning the operational technique with 3R concept in Magelang City Waste Management.The research method in measuring volume and composition of waste is according to SNI 19-3964-1994.The result shows in year 2007, the quantity of inorganic waste that economically valuable beforeoptimalization is 1880,625 kg/day (4 %) and after optimalization is 6245,28 kg/day (13,28 %). While theincome of trash collector increase from Rp. 2.424.871,00 per day to Rp 8.052.679,00 per day. By applyingthis concep,t the waste managed by trash collector will increase495,67% from17,77 m3/day become 105,87m3/day in the year of 2023. Beside, by applying this 3R concept Magelang City can reduce the wasteoperational cost equal to 14, 27%.

Analisa Metode Pengukuran Berat Badan Manusia Dengan Pengolahan Citra Fauzi, Hilman; Rahman, Fadlur; Azhar, Tauhid Nur; Ayudina, Nasya; Dwiatmaja, Ratri
TEKNIK Vol 38, No 1 (2017): (Juli 2017)
Publisher : Diponegoro University

Body weight is one of the most important parameters to determine the condition of a person's body. To find out information about the weight is generally done by using a measurement scales. However, there are several methods that can be done to determine a person's weight, one of which is by using image processing. Through this study, we tried to decipher the possibility of weight calculation using image processing with various mathematical approach based on a calculation of body surface area (BSA) and the volume of the ellipse for the human body. We process the image in the form of digital photos to generate information on the person's weight on the photo. Furthermore, we did investigate the possibility, calculation, and analysis of the accuracy of the system. To determine the performance of the system that we made, we did the comparison calculation results with body weight results of the scales. As a result, we conclude that the weight calculation method is feasible through image processing with various conditions and restrictions, it is confirmed by the results of the analysis and the accuracy of our calculation system is 95% at a distance of 470 cm between the camera and the object.

PENYELIDIKAN POLA ALIRAN EMBUNG SAMIRAN DENGAN UJI MODEL HIDROLIK FISIK Ari Wulandari, Dyah; Kirno, Kirno
TEKNIK Volume 31, Nomor 1, Tahun 2010
Publisher : Diponegoro University

Samiran Dam is located in Grawah river, Boyolali Regency, Central Java Province. The aim of Samiran Damis for service water supply. The hydraulic model test are conducted for clarifying the appropriateness ofhydraulic design, to perfect and optimize the hydraulic design of the spillway. One of the main objective is tostudy the flow pattern approaching spillway, at spillway, stilling bazin and river in the downstream of thestilling bazin.The detail model is made as three dimensional model, covering the part of reservoir, spillway, stilling bazin andriver in the downstream of spillway. The hydraulic model test was carried out in The Hydraulic Laboratory ofExperimental Station for River in Surakarta.Base on the study result then there are necessary to modified design of the stilling bazin and to add groundsillconstruction at the river in the downstream of the stilling bazin

KINETIKA TRANSESTERIFIKASI BIODIESEL JARAK PAGAR Luqman, Buchori; Setia, Budi Sasongko
TEKNIK Volume 33, Nomor 2, Tahun 2012
Publisher : Diponegoro University

Biodiesel were produced by trans-etherification of castor oil with alcohol in the presence of NaOH catalyst. Thereaction mechanism and model of castor oil trans-etherification isA + 3B C + 3 DA, B, C, and D were castor oil, alcohol, glycerol, and ester. The reaction rate equation was r=-dCA/dt =k1(CA)(CB)3â€“k2(CC)(CD)3. In this study was used two measurement method of free fat acid as the rest content ofcastor oil with SNI 01-3555-1998 and AOAC (Association of Analytical Chemist). It found that SNI 01-3555-1998 method was the easier and the acurate measurement. The classification of alcohol used was methanol andethanol to compare the action both of them. Methanol produces the higher conversion than ethanol. The reactionin a batch reactor with temperature 40, 50, and 60Â°C in atmospheric pressure as the operation condition tolooking for kinetics parameter of trans-etherification. Coefficient reaction rate and activation energy were lookinto kinetics study. Reaction rate was a mathematics model as a function of concentration and time which solvedby Runge-Kutta, multivariable optimization and SSE (some square error) method using Matlab. The activationenergy (Ea) and impact factor (A) obtained by linier regression method. The result of study obtained the kineticsparameter of trans-etherification with methanol k1=1.9313x1031exp (-41.940/RT) average error 0.0010 andk2=2.7678x1025exp(-37.362/ RT) average error 0.0003. While kinetics parameter of trans-etherification withethanol obtained k1=1.168x1019exp(-24.588/ RT) average error 0.0306 and k2=4.9966x106exp(-10.328/RT)average error 0.1589. It means, more reactive alcohol then bigger the value of kinetics parameter.

Analisis Kenaikan Tekanan Fluida Terhadap Tegangan Dan Fleksibilitas Pipa Blowdown A106 Grade A Berdasarkan ASME B31.3 Mahardhika, Pekik; Julianto, Eko; Indartono, Arie; Kusuma, George E.
TEKNIK Vol 39, No 1 (2018): (July 2018)
Publisher : Diponegoro University

Aplikasi sistem perpipaan untuk distribusi fluida banyak di jumpai dalam kehidupan sehari-hari. Boiler di PLTU beroperasi secara kontinyu sehingga perlu dilakukan proses blowdown secara berkala. Sistem blowdown berguna untuk mengontrol dan membuang kandungan solid dalam sisa air pemanasan. Pertemuan dua zat berbeda fase dan temperatur tinggi pada pipa dapat menimbulkan kenaikan tekanan. Tekanan merupakan salah satu hal yang harus dipertimbangkan dalam sistem perpipaan. Dampak negatif kenaikan tekanan fluida secara kontinyu adalah terjadinya deformasi pipa. Deformasi pipa disebabkan tegangan pipa melebihi nilai tegangan yang diijinkan. Kode yang digunakan adalah ASME B31.3 Piping Process.Â Berdasarkan kriteria critical line, pipa blowdown A106 Gr.A merupakan kategori B yang harus dikoreksi dengan metode sederhana. Fluida di dalam pipa blowdown telah terjadi kenaikan tekanan menjadi 322,55 psi dan bersifat turbulen. Berdasarkan ASME B31.3, Tegangan pipa akibat beban sustain setelah terjadi kenaikan tekanan fluida masih berada di bawah tegangan ijin (16000 psi). Fleksibilitas pipa masih di bawah nilai fleksibilitas yang diijinkan. Sistem perpipaan blowdown masih dinyatakan aman.

PEMODELAN TIME-DEPENDENT BEHAVIOR MATERIAL DENGAN MENGGUNAKAN ELEMEN SPRING DAN DASHPOT Wibowo, Hardi
TEKNIK Volume 30, Nomor 2, Tahun 2009
Publisher : Diponegoro University

To model behavior of material, there are two basic models of the material element i.e.: spring and dashpot.In many cases, time-dependent behavior of a material can not enough be used just one or two basic modelof the material element. To model time-dependent behavior of a material, combination of many basicmaterial elements should be used. The most important of long term behaviors of concrete material is creepbehavior. Many equation of creep prediction of the concrete materials have been proposed to manydesign specification and rule design, i.e.: American Concrete Institute (ACI), CEB/FIP 78 and 90, BaÅ¼ant-Panula, Sakata, etc. This paper will be considering and demonstrating how to model creep compliancebased on creep coefficient as used by ACI-209 by using assembly of those basic material element

STUDI PENGARUH VARIABEL-VARIABEL DALAM CFD UNTUK MENGHITUNG KOEFISIEN TAHANAN KAPAL Chrismianto, Deddy; Manik, Parlindungan
TEKNIK Volume 34, Nomor 3, Tahun 2013
Publisher : Diponegoro University

Commonly, the Computational Fluid Dynamic (CFD) analysis using the finite volume method, solid modeling is usually used in the early stage in order to prepare a mesh process before the computational process is executed. In this paper the CFD analysis must be executed to obtain a resistance coefficient value, and the verification should be done to ensure a result is close to experimental data. In the CFD analysis, some parameters have been taken into account, including the variation of domain dimensions, variation of mesh sizes, and variation of boundary conditions, in which the comparison between the numerical analysis and experimental data showed good agreement in general. The result of the case no.1 has a smaller difference of the resistance coefficients to the experimental data than other cases, in which the total resistance coefficient (Ct) has a difference about 1.95% of experimental data, the friction resistance (Cf) has a difference about 0.83% of experimental data, and there is a difference about 6.30% of experimental data for the residual resistance (Cr).

Perbaikan Proses Produksi Antosianin dari Kelopak Bunga Rosella dengan Ekstraksi Berbantuan Ultrasound Triyastuti, Meilya Suzan; Djaeni, Mohamad
TEKNIK Vol 40, No. 2 (2019): Agustus 2019
Publisher : Diponegoro University

Kelopak bunga rosella mengandung senyawa bioaktif diantaranya Antosianin. Kelopak bunga rosella mempunyai pigmen berwarna ungu yang berpotensi sebagai zat pewarna alami untuk menggantikan pewarna sintetis Violet GB. Pigmen warna ungu ini berasal dari senyawa antosianin. Namun senyawa antosianin ini mudah terdegradasi pada temperatur diatas 70Â°C, sehingga diperlukan metode ekstraksi yang tepat pada kondisi optimum. Metode yang digunakan yaitu ekstraksi dengan bantuan gelombang ultrasonik (Ultrasound Assisted Extraction) dan dioptimasi menggunakan software Design Expert. Hasil penelitian menunjukkan bahwa kondisi optimum ekstraksi pada waktu ekstraksi 15 menit, rasio sampel dan pelarut 15 gr/ml dan temperatur ekstraksi 50Â°C dengan kadar antosianin sebesar 206,996 ppm

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