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All Journal Jurnal Teknik Mesin UDA Jurnal Ilmu Ekonomi, Pendidikan dan Teknik (IDENTIK) Jurnal Ilmu Teknik Sipil Indonesia (JITESNA)
Zega, Berkat
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Religion Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Economics, Econometrics & Finance Education Engineering Mechanical Engineering Transportation

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Analisis Pengaruh Tegangan Permukaan Pada Sistem Mikrofluida Zega, Berkat; Gea, Gregorius Andi Prasition
Jurnal Ilmu Ekonomi, Pendidikan dan Teknik Vol. 2 No. 3 (2025): IDENTIK - Mei
Publisher : CV. SINAR HOWUHOWU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70134/identik.v1i2.114

Abstract

Surface tension plays a pivotal role in phenomena occurring at the microscale, particularly within microfluidic systems. This research conducts a comprehensive literature review to analyze the influence of surface tension on various aspects of microfluidics, such as droplet formation, flow in microchannels, and fluid-solid interactions. Diverse methods for measuring surface tension at the microscale are also discussed, along with the associated challenges. Furthermore, this review highlights recent advancements in mathematical modeling to predict fluid behavior in microfluidic systems under the influence of surface tension. The findings of this literature review demonstrate that a profound understanding of surface tension is essential for designing and optimizing microfluidic devices for a wide range of applications, spanning from biomedical to chemical industries.
ANALISA PERBANDINGAN KEMAMPUAN KERJA CHIPPER MACHINE PADA PENYERPIHAN KAYU DENGAN MENGGUNAKAN JUMLAH MATA PISAU YANG BERBEDA DI UNIT WOODYARD PT. RIAU ANDALAN PULP AND PAPER Lumban Gaol, Mangandar; Zega, Berkat
Jurnal Teknologi Mesin UDA Vol 2 No 2 (2025): DESEMBER
Publisher : Lembaga Penenlitian dan Pengabdian kepada Masyarakat Universitas Darma Agung

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Abstract

Chipper machine merupakan alat yang berfungsi untuk mencincang kayu gelondongan (log) menjadi serpihan (chip). Untuk mendapatkan chip yang dihasilkan, chipper machine dilengkapi dengan jumlah mata pisau yang dilengketkan pada disc. Ketajaman mata pisau sangat mempengaruhi kualitas chip yang dihasilkan. Adapun maksud dan tujuan dari penelitian ini adalah untuk mengetahui kemampuan pemotongan dari chipper machine, cara preventive maintenance, dan cara – cara mengatasi masalah – masalah yang sering terjadi pada saat proses penyerihan kayu. adapun metode pada penelitian ini adalah dilakukan dengan cara observasi langsung terhadap objek yang diteliti. Dari hasil penelitian diperoleh kesimpulan bahwa waktu yang dibutuhkan chipper machine dalam pencincangan kayu dengan menggunakan 8 mata pisau adalah 0.18 detik, dan dengan menggunakan 10 mata pisau adalah 0.16 detik dengan panjang kayu 2 meter dan diameter kayu 100 mm. Pada saat proses pencincangan kayu sering terjadi masalah yaitu diperlukan daya yang besar terhadap pemakaian 10 mata pisau. Untuk menjaga agar mata pisau tidak cepat tumpul hendaknya operator lebih teliti dalam mengawasi terikutnya benda – benda keras seperti logam dan batu.
Model Matematika Optimasi Biaya Dan Waktu Pada Penjadwalan Proyek Konstruksi Teknik Sipil Zega, Berkat
Jurnal Ilmu Teknik Sipil Indonesia Vol. 2 No. 1 (2026): JITESNA - Januari
Publisher : CV. SINAR HOWUHOWU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70134/jitesna.v2i1.1316

Abstract

Civil engineering construction projects are highly complex and therefore require effective planning and control, particularly in terms of cost and time. Project delays and cost overruns frequently occur due to suboptimal scheduling practices. This study aims to develop a mathematical model for cost and time optimization in construction project scheduling. A quantitative approach using mathematical modeling is employed, in which the scheduling problem is formulated as an objective function to minimize total project cost subject to duration constraints and precedence relationships among activities. An initial analysis is conducted using the Critical Path Method (CPM) to identify critical activities as the basis for optimization. The optimization model is solved using linear programming techniques with the assistance of optimization software. The results indicate that the proposed mathematical model is capable of producing a more efficient project schedule compared to conventional scheduling, as evidenced by a reduction in project duration and total cost. Furthermore, the time–cost trade-off analysis reveals the existence of an optimal project duration that results in minimum total cost. This study is expected to contribute theoretically to the development of construction management knowledge and practically as a decision-support tool for planning and controlling civil engineering construction projects.
Co-Authors Gea, Gregorius Andi Prasition Lumban Gaol, Mangandar