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All Journal Teras Jurnal Multidiciplinary Output Research for Actual and International Issue (Morfai Journal)
Mohd Isneini
Universitas Lampung
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ANALYSIS OF THE EFFECTIVENESS OF RAILWAY SERVICE IN LAMPUNG ON THE TANJUNG KARANG STATION – KOTABUMI STATION ROUTE Muhamad Choirudin K; Aleksander Purba; Rahayu Sulistyorini; Muhammad Karami; Mohd Isneini
Multidiciplinary Output Research For Actual and International Issue (MORFAI) Vol. 6 No. 4 (2026): Multidiciplinary Output Research For Actual and International Issue
Publisher : RADJA PUBLIKA

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Abstract

This study aims to analyze the effectiveness of railway services in Lampung on the Tanjung Karang–Kotabumi route from the users’ perspective using a quantitative survey-based approach. The research focuses on Rajabasa (economy class) and Kuala Stabas (premium class) train services. Data were collected through Likert-scale questionnaires and secondary sources using an accidental simple random sampling technique. The variables include traveler characteristics, travel characteristics, and transportation system facilities. Data validity and reliability were tested before being analyzed using the Classification and Regression Tree (CART) method. The results indicate that service effectiveness is strongly influenced by the quality of interaction between staff and passengers as well as the condition of physical carriage facilities. Staff attributes emerge as the most dominant factor with the highest satisfaction scores, while management aspects remain the primary weakness. Differences in facility quality between premium and economy classes and accessibility issues in premium services were also identified. The CART model reveals that integrated operational and service quality is the key determinant, with staff attributes as the strongest predictor. The optimal model was obtained at a 1.5 threshold with high accuracy.
Pengaruh Styrofoam sebagai Pengganti Sebagian Agregat Kasar terhadap Sifat Mekanik Self-compacting Concrete (SCC) Cahyani Putri Agustin; Masdar Helmi; Vera Agustriana Noorhidana; Mohd Isneini
Teras Jurnal : Jurnal Teknik Sipil Vol. 15 No. 2 (2025): Teras Jurnal (September)
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v15i2.1284

Abstract

Abstrak   Styrofoam merupakan salah satu solusi untuk mengurangi beban mati pada struktur. Styrofoam dalam beton dapat berperan sebagai pengisi udara yang menciptakan void, sehingga styrofoam dapat menghasilkan beton yang lebih ringan. Penelitian ini dilakukan dengan mengganti sebagian agregat kasar dengan 10%, 20%, dan 30% butiran styrofoam pada SCC (Self-compacting Concrete). Hasil uji menunjukkan bahwa semakin tinggi kadar styrofoam, maka akan semakin rendah berat volume, kuat tekan, kuat tarik, kuat lentur, dan akan semakin tinggi daya serap air beton tersebut. Hasil optimum yang diperoleh berdasarkan pengujian kuat tekan, kuat tarik belah, dan kuat lentur ada pada beton dengan kadar styrofoam 10%, dengan hasil pengujian berturut-turut yaitu, 20,6227 MPa, 2,348 MPa, dan 4,3148 MPa, sedangkan untuk Penyerapan air tertinggi terjadi pada BS3 (styrofoam 30%), yang menghasilkan 12,4450% peningkatan daya serap.    Kata kunci: Styrofoam, berat volume, sifat mekanik, self compacting concrete (SCC)   Abstract   Styrofoam is one of the solutions to reduce dead loads on structures. Styrofoam in concrete can act as an air filler that creates voids, so styrofoam can produce lighter concrete. This research was carried out by replacing part of the coarse aggregate with 10%, 20%, and 30% styrofoam granules in SCC (Self-compacting Concrete). The test results show that the higher the styrofoam content, the lower the volume weight, compressive strength, tensile strength, bending strength, and the higher the water absorption of the concrete. The optimum results obtained based on the testing of compressive strength, tensile strength, and flexural strength were on concrete with a styrofoam content of 10%, with consecutive test results of 20.6227 MPa, 2.348 MPa, and 4.3148 MPa, while for the highest water absorption occurred in BS3 (30% styrofoam), which resulted in a 12.4450% increase in absorbency.    Kata kunci: Styrofoam, weight volume, mechanical properties, self-compacting concrete (SCC)
Co-Authors Aleksander Purba Cahyani Putri Agustin Lukman Sarifuddin Masdar Helmi Muhamad Choirudin K muhammad karami Rahayu Sulistyorini Surya Sebayang Vera Agustriana Noorhidana