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INDONESIA
TEKNIK
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.
Arjuna Subject : -
Articles 522 Documents
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Analisis Pengaruh Posisi Side hull terhadap Karakteristik Rolling Motion dengan Metode Trochoidal Curve pada Kapal Trimaran Wilma Amiruddin; Hartono Yudo
TEKNIK Vol. 44, No. 2 (2023): August 2023
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v44i2.55135

Abstract

Modifying a fishing boat into a trimaran will expand the ship's deck. In this modification process, the position of the side hull will influence the rolling motion characteristics of the ship. The objective of this study is to see the probability of synchronism. Synchronism is a situation that can cause a large forced oscillation. Two ship models are analyzed, the ship model 1 (12 x 10) and the ship model 2 (10 x 12). The analysis was carried out based on hydrostatic calculations using Delftship and energy changes with the Trochoidal Curve theory approach. The analysis results show that all models have a high probability of synchronization conditions. The position of the side hull does not significantly affect the model for fixed displacement. Ship model 1 has a period (T) of 2.4 s, and ship model 2 has a  period (T) of 2 s. This value is relatively low compared to the value of the rolling period of the monohull, where the period (T) is  6 s and the minimum limit for fishing vessels (T) is 5.5 s. This change produces a significant rolling motion transverse.
Peningkatan Akurasi Konsentrasi Pemberian Pupuk Pada Sistem Hidroponik Menggunakan Programmable Logic Controller Ali Sadiyoko; Kevin Adi Perdana; Christian Fredy Naa
TEKNIK Vol. 44, No. 2 (2023): August 2023
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v44i2.53301

Abstract

Hydroponics is a farming method using water as a medium for storing nutrients (fertilizer/nutrients). Therefore, the concentration of dissolved fertilizers in the water is crucial for plant growth. The method of measuring dissolved fertilizers in hydroponic systems is usually done by measuring the value of the EC and Total Dissolved Solids of the solution. However, because the EC and TDS measurement processes are not carried out continuously, this can result in plant growth being disrupted. In this study, an automatic fertilizer concentration control system was designed based on EC values that can be monitored continuously. The fertilizer concentration control process will be carried out automatically using a PLC, which is equipped with a TDS sensor and several pumps. EC value measurements are carried out indirectly using a TDS sensor. Testing of the design system was carried out for 8 days, during which time the design of this system managed to maintain EC values between 0.844 mS/cm to 1.051 mS/cm. The standard EC value required by lettuce plants is 0.8 mS/cm ~ 1.2 mS/cm. This shows that this system is more accurate than the reference system, which is able to maintain EC values between 0.8 mS/cm to 1.2 mS/cm.
Reka Bentuk Alat Angkut Ergonomis Tanaman Hortikultura untuk Menurunkan Sindrom Musculoskeletal Resalfa Amelza Wibowo; Hartomo Soewardi
TEKNIK Vol. 44, No. 2 (2023): August 2023
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v44i2.50281

Abstract

Horticulture is the activity of cultivating garden plants in the form of fruits, vegetables, flowers, and ornamental plants. This cultivation is carried out starting from nurseries to mass distribution. Conveyance is one of the plant transference equipment in order to support the process. Based on the preliminary study, the transference of plants is still done manually by lifting one by one box weighing 9-10 kg with a limited capacity. This condition affects ineffectiveness and discomfort work process, namely pain in the right shoulder (29%), left upper arm and right upper arm (71%), left forearm and right forearm (100%), right wrist (57%), and right hand (43%). Thus, it is important to modify the conveyance to make it more ergonomic. Redesigning the conveyance using ergonomic principles is the purpose of the research. Quality Function Deployment (QFD) method is used to determine the design specifications of the proposed device to suit the user’s needs. The survey was used to identify attributes of design required by the users. Statistical analysis was done to test a hypothesis. Result of this study shows that the conveyance design developed is valid to suit the user’s need at a significance level of 5%, namely comfortable, easy to use, strong, and effective. The redesigned conveyance can reduce the risk of musculoskeletal syndrome by 60% from high risk to low risk. Thus, the developed design is more comfortable and more effective in use.
Studi Eksperimental Penggunaan Bahan Tambah Limbah Ban Karet dengan Metode Pencampuran Bertahap terhadap Kinerja Campuran Hot Rolled Sheet-Wearing Course Iqbal Iqbal; Miftahul Fauziah
TEKNIK Vol. 44, No. 2 (2023): August 2023
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Pavement conditions in Indonesia often do not reach their design life during the service period. This may cause damage. There is a need for a pavement mixture that has good bearing capacity and durability, is not sensitive to weather, and is safe for the environment. This study aims to analyze the performance of the Hot Rolled Sheet-Wearing Course (HRS-WC) mixture with the addition of rubber tire waste and the influence of the mixing method. This study carried out several measurement stages in the laboratory. These include testing the physical properties of aggregates, determining the optimum bitument content value, and carrying out tests to measure several characteristics, namely Marshall, Index Retained Strength (IRS), Indirect Tensile Strength (ITS), Tensile Strength Ratio Test (TSR), Cantabro Loss (CL), and Asphalt Flow Down (AFD) with added levels of 0%, 2%, 4%, and 6% rubber tire powder. The research results showed that the HRS-WC mixture with the addition of rubber tire powder was able to improve the Marshall characteristics in terms of their volumetric properties. Meanwhile, in terms of mechanical properties, the addition of 2% rubber tire powder can improve stability and performance. ITS characteristics, with the addition of 2% and 4% rubber tire powder, were able to improve the performance of the mixture, whereas the TSR characteristics were only added at 2%. The characteristics of IRS, CL, and AFD with the addition of rubber tire powder can improve the performance of the mixture. The use of a gradual mixing method produces better performance compared to conventional mixing methods.
Metode Pemasangan Instrumen Keamanan Bendungan Lausimeme Aliputa, Henu Satya; Sukamta, Sukamta; Nugroho, Hari
TEKNIK Vol. 45, No. 1 (2024): May 2024
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v45i1.59938

Abstract

Penelitian ini bertujuan untuk membuat metode pemasangan instrumen keamanan Bendungan Lausimeme sesuai gambar kerja (shopdrawing) dan keadaan di lapangan. Hasil penelitian menunjukkan terdapat 16 Piezometer Vibrating Wire (PVW), 4 Inklinometer, 4 Multilayer Settlement, dan 8 Open Standpipe Piezometer dipasang dengan pengeboran. Total kedalaman pengeboran untuk pemasangan instrumen adalah 438,92 m. Sebanyak 42 PVW, 9 Crest Settlement Survey Point, dan 21 Surface Settlement Survey Point dipasang bersamaan tubuh bendungan. Sebanyak 1 Seepage Measuring Device, 1 Seismograf dan 1 Observation Well dipasang diluar tubuh bendungan. Tahapan umum pemasangan dengan pengeboran dimulai dengan persiapan instrumen, marking titik pengeboran, pengeboran, pemasangan instrumen, pembacaan instrumen, pengisian lubang bor, dan penempatan pipa/kabel. Pemasangan instrumen bersamaan dengan tubuh bendungan dimulai dengan persiapan instrumen, marking titik, pemasangan instrumen, dan pembacaan instrumen. Instrumen observation well yang dipasang diluar tubuh bendungan memiliki tahap yang sama seperti pisometer pipa terbuka. Seepage measuring device dan seismograf memiliki tahap pekerjaan yang bervariasi. Sumber daya utama yang diperlukan untuk pengeboran adalah tim pengeboran, material pengisi lubang bor, dan 1 set alat bor kering. Sumber daya utama untuk pemasangan bersamaan dengan tubuh bendungan adalah waterpass dan handtamper. Kontraktor harus menyiapkan sumberdaya yang dibutuhkan 1 bulan sebelum pekerjaan dimulai.
Implementasi Multi-Method Modeling untuk Mendukung Keterpaduan Perencanaan Pembangunan di Sub DAS Srep, Kabupaten Kudu Sriyana, Sriyana; Winaktoe, Wied Wiwoho
TEKNIK Vol. 44, No. 3 (2023): December 2023
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v44i3.56875

Abstract

Tata kelola pembangunan yang lemah terindikasi menjadi penyebab ancaman bencana kelangkaan air di Indonesia pada tahun 2045. Tata kelola tersebut khususnya terkait keterpaduan pengelolaan Daerah Aliran Sungai (DAS).  Penelusuran terhadap praktik mutakhir komunitas Internasional menunjukkan bahwa multi-method modeling menjadi rekomendasi untuk diaplikasikan. Tujuan riset ini adalah menerapkan multi-method modeling yang didukung oleh eksaminasi hubungan kausal terhadap parameter pembentuk sub kriteria klasifikasi DAS dan merestrukturisasi hasil-hasil tersebut melalui DPSIR. Adapun lokasi kajian berada di Sub DAS Srep, Jawa Tengah dan dataset merupakan data-data yang diperoleh melalui dokumen kajian sub DAS Srep, Indeks Desa Membangun, dan survey pada periode 2015-2020.  Hasil riset menunjukkan bahwa (1) sub terdapat sub kriteria yang menjadi prasyarat atau penentu keberhasilan sub kriteria klasifikasi DAS lainnya; (2) informasi hubungan eksogenik yang diformulasi secara saintifik dapat membantu sektor-sektor mengetahui posisinya dan hubungannya terhadap sektor lainnya agar dapat bersinergi secara subtantif maupun ketepatan dalam jadwal pelaksanaan. Hal ini dapat memperjelas akar masalah, meningkatkan keterpaduan perencanaan dan mereduksi kelemahan kordinasi dan tumpang-tindih kegiatan; (3) analisis secara isolatif tidak sensitif terhadap dampak yang ditimbulkan pada parameter atau sub kriteria lain dalam DAS.  
Analysis of the Time Cost Trade-Off Method Application on Tug Boat 135 GT Repair Projects Owned by PT. Pelabuhan Indonesia II Santosa, Ari Wibawa Budi; Trimulyono, Andi; Firnandito, Anugrah; Subekti, Joko; Hadi, Eko Sasmito
TEKNIK Vol. 45, No. 1 (2024): May 2024
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v45i1.52415

Abstract

In the project implementation process, there is still the possibility of delays, as in the case of the Tanjung Buyut I Tug Boat ship repair project - 206 135 GT calculations are needed to accelerate the project to determine the optimum time and cost. One method that can be used in accelerating projects / crashing projects is the Time Cost Trade-Off method. This method can be used to solve this problem by adding specific alternatives such as working hours, labor, and other things with the minimum additional cost. In this study, an alternative acceleration was carried out by adding manpower and working hours duration of 1 to 4 hours which would be applied to the Hull repair project for the Tug Boat Tanjung Buyut I-206 135 GT. Based on the results of the analysis that has been carried out on the work of the Hull section, which is included in the critical activity, it is obtained that the most optimum duration acceleration is the addition of working hours (overtime) for 3 hours and an additional workforce of 24 peoples which results in an acceleration of time of 17 days from the normal duration of 60 days to 43 days with a time efficiency of 28%, as well as a cost reduction of IDR 19,700,000 or around 3.34% compared to the normal duration fee of IDR 571,950,000 to IDR 552,250,000.
A Review on Digital Microscopic Images for Plasmodium Parasite Detection Nisworo, Sapto; Prananda, Alifia Revan
TEKNIK Vol. 44, No. 3 (2023): December 2023
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v44i3.53990

Abstract

Indonesia is one of the regions that contribute to the increasing number of malaria cases. In 2019, more than 250 million malaria cases were found in Indonesia. This phenomenon is caused by several factors, including the examination procedure. In Indonesia, the digital microscopic examination has become the gold standard procedure in detecting and diagnosing malaria, whereas this procedure requires considerable expertise. Hence, the rapid examination is difficult to ensure. In order to overcome this problem, several methods of malaria detection have been proposed with a different approach. Image processing and computer vision techniques have become a powerful approach in the development of early detection systems called computer-aided detection (CADe) and computer-aided diagnosis (CADx). Several previous findings reported their contributions in detecting Plasmodium parasites using image processing and computer vision. Recently, artificial intelligence, including machine learning and deep learning, also offered outstanding results in detecting the Plasmodium parasite. This paper aims to present a scientific review of recent image processing and computer vision applications for the development of CADe or CADx in order to assist the doctor in doing rapid detection and diagnosis.
Analisis Nilai Lugeon dan Grout Take Berdasarkan Hasil Trial Grouting pada Sandaran Kanan Bendungan Ameroro untuk Mengidentifikasi Korelasi Nilai Lugeon dengan Kondisi Geologi Batuan Pondasi Nasmiarta, Zhafarina Malaha; Suharyanto, Suharyanto; Sukamta, Sukamta; Permana, Agung
TEKNIK Vol. 45, No. 1 (2024): May 2024
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v45i1.59324

Abstract

Pondasi Bendungan Ameroro tersusun dari batuan metamorf sekis yang memiliki sebaran kekar terbuka dengan jarak spasi rata-rata 12,5 cm dan bukaan kekar 1-5 cm. Hal tersebut dapat berpotensi terjadinya rembesan air melalui sela-sela rekahan sehingga diperlukan adanya perbaikan pondasi pada Bendungan Ameroro dengan metode grouting. Sebelum dilakukan pekerjaan grouting, dilakukan pekerjaan trial grouting. Penelitian ini dilakukan untuk melihat korelasi nilai lugeon dengan kondisi geologi batuan pondasi. Metode yang dilakukan adalah uji permeabilitas (uji lugeon). Dari hasil uji lugeon, di lubang pilot, lubang primer dan lubang sekunder menunjukkan bahwa semakin dalam lubang trial grouting, nilai lugeon akan semakin kecil sedangkan semakin besar nilai lugeon, grout take akan semakin besar. Namun, pada lubang cek terdapat nilai lugeon yang masih tinggi di kedalaman 10 meter yaitu 5,17 – 8,14, di kedalaman 20 – 25 meter juga memiliki nilai yang tinggi yaitu 4,86. Hal ini sesuai dengan peta geologi pada sandaran kanan sedalam 35 meter memiliki struktur batuan yang kurang bagus sehingga memiliki nilai lugeon cukup tinggi dan besar grout take tinggi.
Evaluasi Deformasi Vertikal Timbunan Tubuh Bendungan Sepaku Semoi Berdasarkan Data Pembacaan Multilayer Settlement Menggunakan Metode Prediksi Deformasi Saat Konstruksi Pratama, Sadewa Eka; Sukamta, Sukamta
TEKNIK Vol. 45, No. 1 (2024): May 2024
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v45i1.60088

Abstract

Pelaksanaan konstruksi Bendungan Sepaku Semoi dimulai pada Tahun 2020, tipe bendungannya berupa timbunan tanah homogen dan dilakukan pekerjaan timbunan terhadap tubuh bendungannya. Adanya faktor tahapan pekerjaan timbunan yang pada setiap fase akan menambah ketinggian tubuh bendungan serta faktor kualitas pemadatan timbunan tubuh bendungan dapat menyebabkan risiko kegagalan bendungan semakin meningkat. Oleh sebab itu, tujuan penelitian ini adalah untuk mengidentifikasi perilaku deformasi vertikal dari timbunan tubuh Bendungan Sepaku Semoi agar keamanan tubuh bendungan terjamin pada saat pelaksanaan konstruksi. Identifikasi perilaku deformasi vertikal pada penelitian ini dilakukan dengan cara mengevaluasi data pembacaan instrumentasi multilayer settlement terhadap kriteria penerimaan menggunakan metode prediksi deformasi saat konstruksi yang terdiri dari tiga metode yaitu total settlement, korelasi vertical strain vs fill height above, dan settlement index. Hasil evaluasi metode total settlement pada seluruh multilayer settlement menghasilkan perilaku normal, begitu juga dengan evaluasi metode korelasi vertical strain vs fill height above menghasilkan perilaku normal, serta evaluasi metode settlement index menghasilkan perilaku normal. Dari ketiga hasil evaluasi metode prediksi deformasi saat konstruksi tersebut dapat disimpulkan bahwa secara garis besar, perilaku deformasi vertikal saat pelaksanaan konstruksi Bendungan Sepaku Semoi mempunyai perilaku normal dan tidak melampaui batas dari kriteria yang diizinkan.

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