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All Journal Jurnal Sains dan Teknologi Jurnal Penelitian Teknologi Informasi dan Sains
Yusril Ihza Tachriri
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Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Dentistry Electrical & Electronics Engineering Energy Engineering Health Professions Industrial & Manufacturing Engineering Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Public Health Veterinary

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Analisis Pengaruh Limbah Cair terhadap Kualitas Air Sungai di Kota Pekalongan Elvinda Bendra Agustina; Yuni Lestiyanti; Yusril Ihza Tachriri; Nina Ulfiya
INSOLOGI: Jurnal Sains dan Teknologi Vol. 4 No. 2 (2025): April 2025
Publisher : Yayasan Literasi Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55123/insologi.v4i2.5117

Abstract

A study has been conducted on the effect of liquid waste on river water quality in Pekalongan city. Banger River, Meduri River, Loji River and Asem Binatur River in Pekalongan city are the objects studied. Water sampling was carried out at one polluted point. Based on water quality testing, it is known that among the four rivers tested, the rivers with the most polluted conditions are the Asem Binatur River, Loji River, Meduri River, and Banger River. This is because the samples were taken during the rainy season, so there is a possibility of soil erosion originating from areas along the river flow. The position of the Meduri River which is close to the sea is also a cause of the increase in the pollutant load in the test results, because the river is mixed with seawater when tidal flooding occurs. In addition, the Meduri River Basin (DAS) is a factory and industrial area, so that wastewater from these activities can also increase the pollutant load on the river. However, the majority of test results from the four rivers still exceed the required quality standards. This is due to the dense population, the large number of batik industries, and agricultural activities that produce waste and have an impact on the pollution of the surrounding rivers.
Pemodelan Tiga Dimensi Struktur Bawah Permukaan Daerah Manifestasi Panas Bumi Menggunakan Data Gravitasi Satelit GGMplus Muhammad Rofiqul A'la; Atika Windra Sari; Dian Arif Rachman; Elvinda Bendra Agustina; Yusril Ihza Tachriri; Rezqi Alfiandi; Rusliyanto Akbar
Jurnal Penelitian Teknologi Informasi dan Sains Vol. 4 No. 2 (2026): Juni: JURNAL PENELITIAN TEKNOLOGI INFORMASI DAN SAINS (JPTIS)
Publisher : Institut Teknologi dan Bisnis (ITB) Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54066/jptis.v4i2.4107

Abstract

Gravity measurements in the Dieng geothermal area at regional and wide scales are still limited. GGMplus data provides large-scale gravity information that can be used for subsurface mapping more efficiently and at lower cost while maintaining optimal results. The GGMplus gravity acceleration data is processed into complete Bouguer anomalies, then separated using upward continuation to obtain regional and local anomalies. Both anomalies are further analyzed using the first horizontal derivative (FHD) and second horizontal derivative (SHD). The results are then used for 3D modeling using Grablox and Bloxer software. The Bouguer anomaly distribution ranges from approximately ‒70 to ‒230 mGal, with high anomalies located in the northeast of the study area, corresponding to geothermal manifestations in Dieng. FHD analysis indicates a regional anomaly source located 6.8 km northeast, interpreted as a magmatic zone. Local anomalies reveal an intrusion body about 2 km in size at a distance of 4 km in Mount Prau, interpreted as a heat source. The 3D model shows high-density values of 2.87 g/cm³ for regional anomalies and 2.8–2.9 g/cm³ for local anomalies, associated with ancient volcanic rocks and diorite intrusions acting as a heat source in the Sikidang–Merdada geothermal system.
Co-Authors Atika Windra Sari Dian Arif Rachman Elvinda Bendra Agustina Muhammad Rofiqul A'la Rezqi Alfiandi Rusliyanto Akbar Yuni Lestiyanti