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Analisis Dampak Pemadatan Tanah Terhadap Kestabilan Struktur Yang Berdekatan Menggunakan Aplikasi Plaxis 2d (Studi Kasus PT. Teruna Perkasa Optimal New Factory Project, Tanggerang-Banten) Dala, Risman; Sulaeman , Agus; Siregar, Chandra Afriade
Impression : Jurnal Teknologi dan Informasi Vol. 4 No. 3 (2025): November 2025
Publisher : Lembaga Riset Ilmiah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59086/jti.v4i3.1154

Abstract

Penelitian ini bertujuan untuk menganalisis dampak pemadatan tanah menggunakan vibro roller terhadap potensi keretakan struktur bangunan yang berada di sekitar area kerja. Studi ini menggunakan pendekatan kuantitatif melalui simulasi numerik berbasis finite element menggunakan perangkat lunak Plaxis 2D untuk memodelkan penurunan dan distribusi tekanan tanah akibat getaran. Hasil simulasi menunjukkan bahwa pada jarak 0,5 meter dari bangunan terjadi penurunan sebesar 2,2 cm dengan tekanan tanah 153,2 kN/m²; pada jarak 5 meter penurunan 0,97 cm (140,6 kN/m²); jarak 10 meter 0,32 cm (137,0 kN/m²); dan jarak 15 meter 0,29 cm (135,5 kN/m²). Secara teknis, nilai penurunan pada jarak 0,5 meter masih berada di bawah batas toleransi SNI 8460:2017 sebesar 2,5 cm, namun peningkatan tekanan tanah menunjukkan potensi risiko terhadap struktur tertentu dengan kondisi fondasi sensitif. Penelitian ini berkontribusi dalam memberikan batas aman operasional pemadatan getaran di area konstruksi padat, dengan rekomendasi jarak minimal 5 meter untuk mengurangi dampak deformasi dan menjaga keselamatan struktur di sekitarnya   This study aims to analyze the impact of soil compaction using a vibro roller on the potential for cracking in building structures around the work area. This study uses a quantitative approach through finite element-based numerical simulations using Plaxis 2D software to model the settlement and distribution of soil pressure due to vibration. The simulation results show that at a distance of 0.5 meters from the building, there is a settlement of 2.2 cm with a soil pressure of 153.2 kN/m²; at a distance of 5 meters, a settlement of 0.97 cm (140.6 kN/m²); a distance of 10 meters, 0.32 cm (137.0 kN/m²); and a distance of 15 meters, 0.29 cm (135.5 kN/m²). Technically, the settlement value at a distance of 0.5 meters is still below the tolerance limit of SNI 8460:2017 of 2.5 cm, but the increase in soil pressure indicates a potential risk to certain structures with sensitive foundation conditions. This research contributes to providing a safe operational limit for vibration compaction in dense construction areas, with a recommended minimum distance of 5 meters to reduce the impact of deformation and maintain the safety of surrounding structures.  
Analisis Kandungan Merkuri dan Hidrokuinon dalam Krim Pemutih Wajah Daring Menggunakan Spektrofotometer Serapan Atom dan Kromatografi Cair Kinerja Tinggi Kusmiyati, Mimin; Tronovani , Elvi; Sulaeman , Agus; Musyarrofah, Laila; Fitriani , Hani Sri; Khotimah , Enung Nur; Mirta, Surya Bin
Journal of Pharmaceutical and Sciences JPS Volume 9 Nomor 1 (2026)
Publisher : Fakultas Farmasi Universitas Tjut Nyak Dhien

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36490/journal-jps.com.v9i1.1176

Abstract

The skin is the outermost organ of the human body and plays an important protective and physiological role. Currently, fair skin is often regarded as a beauty standard desired by both men and women. Mercury and hydroquinone are active ingredients commonly used in whitening products due to their ability to inhibit melanin formation; however, their use can cause serious toxic effects. This study aimed to determine the presence of mercury and hydroquinone qualitatively and quantitatively in facial whitening creams sold online in Bandung City. Samples showing positive results were further analyzed quantitatively to determine their concentrations. For mercury analysis, samples were digested using a microwave digestion method to eliminate organic substances. The color reaction test for mercury employed KI 0.5 N, HCl 6 M, and NaOH 2 N reagents. Based on qualitative testing, samples labeled D and N were positive for mercury. Quantitative determination of mercury was conducted using Atomic Absorption Spectrophotometry (AAS) at a wavelength of 253.7 nm. For hydroquinone analysis, qualitative color tests were carried out using FeCl₃ 5%, phenanthroline, and Benedict reagents, while quantitative analysis was performed using High-Performance Liquid Chromatography (HPLC). Of the 17 samples tested, two (D and N) contained mercury at concentrations of 2,776 ±  0,036 μg/g and 4,277 ± 0,021 μg/g, respectively, and two others (E and H) contained hydroquinone 2,3745% and 2,4798%.