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All Journal Jurnal Environmental Science INTAN Jurnal Penelitian Tambang
Setyowati, Riris
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Astronomy Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Engineering Environmental Science Social Sciences

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KARAKTERISTIK FISIK TANAH PADA BEBERAPA SPESIES POHON DI TAMAN WISATA ALAM GUNUNG MEJA MANOKWARI Setyowati, Riris; Boseren, Melanesia Brigite
Jurnal Environmental Science Vol 7, No 2 (2025): April
Publisher : UNIVERSITAS NEGERI MAKASSAR

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35580/jes.v7i2.68059

Abstract

Penelitian ini dilakukan di Hutan Alam dan Hutan Tanaman Kawasan Gunung Meja Manokwari. Penelitian ini bertujuan untuk menganalisis dan mengetahui karakter fisik tanah (kerapatan tanah dan porositas tanah) pada lima spesies pohon, serta menganalisis dan mengetahui hubungan pengaruh sifat fisik tanah terhadap diameter dan tinggi pohon. Sampel tanah di bawah pada kedalaman 0-5 cm dan 5-10 cm. Data diolah secara kuantitatif menggunakan perangkat lunak statisti R-Studio. Secara statistik, tidak terdapat perbedaan signifikan antara kerapatan massa tanah dan porositas di hutan alam dan hutan tanaman. Namun, nilai kerapatan tanah dan porositas cenderung lebih tinggi pada lapisan permukaan (0-5 cm) dibanding lapisan dibawahnya (5-10 cm). Nilai rata-rata kerapatan tanah di hutan tanaman, yaitu 0,63 g/cm3 (0-5 cm) dan 0,76 g/cm3 (5-10 cm); sementara hutan alam, yaitu 0,72 g/cm3 (0-5 cm) dan 0,53 g/cm3 (5-10 cm). Selanjutnya, nilai rata-rata porositas tanah di hutan tanaman, yaitu 69% (0-5 cm) dan 64,45% (5-10 cm); sementara hutan alam, yaitu 72,66% (0-5 cm), dan 64,90% (5-10 cm). Kerapatan tanah dan porositas memiliki korelasi positif terhadap pertambahan tiap diameter dan tinggi pohon.
THE INFLUENCE OF ADDITIVE BASED ON GLUCOSE ON THE SETTING TIME AND STRENGTH OF DRILLING CEMENT: PENGARUH PENAMBAHAN ADITIF BERBAHAN DASAR GLUKOSA TERHADAP SETTING TIME DAN STRENGTH SEMEN PEMBORAN Resesiyanto, Hastowo; Setyowati, Riris
INTAN Jurnal Penelitian Tambang Vol. 8 No. 1 (2025): INTAN: Jurnal Penelitian Tambang
Publisher : Program Studi S1 Teknik Pertambangan Fakultas Teknik Pertambangan dan Perminyakan Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56139/intan.v8i1.287

Abstract

Oil well cement is a cement commonly used in the petroleum industry, especially in cementing operations. This cement is a type of Portland cement and is anhydrous, meaning that the components in the cement will break up and form hydrate components when meeting water and then slowly harden. In the preparation of cement suspensions and during cementing operations, the physical properties of cement suspensions must always be considered because they will affect the quality of cementing results. Research was conducted on a laboratory scale based on experiments to test the physical properties of drilling cement. The experiment aims to test the compressive strength of cement rock and the setting time in the form of initial and final setting time required by the cement suspension to harden as a result of the addition of glucose-based additives. The test results showed that the greater the concentration of glucose-based additives added to the drilling cement suspension, the longer the setting time of the cement suspension and the lower the strength of the cement rock.
Co-Authors Boseren, Melanesia Brigite Hastowo Resesiyanto, Hastowo