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All Journal Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) SEIKO : Journal of Management & Business Indonesian Physical Review Jurnal Politik Pemerintahan Dharma Praja
Yayat Sudrajat
Pusat Penelitian Geoteknologi LIPI
Education Energy Engineering Environmental Science Physics Social Sciences

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Changes in the Configuration of the Fresh Water Lens due to ASRRG, Western Part of the Tiny Pari Island, Seribu Islands, Jakarta, Indonesia Utomo, Edi Prasetyo; Purwoaminta, Ananta; Sudrajat, Yayat
Jurnal Geologi dan Sumberdaya Mineral Vol 18, No 1 (2017): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (465.671 KB)

Abstract

Pari Island (Pulau Pari) is a small coral island in the Seribu Islands group off the north coast of the Jakarta Capital Special Region. Government has planned to develop this island into a tourist attraction because of its beautiful environment. However, the government development plans have not included facilities to meet the demand for groundwater, which represents the principal resource to meet the demand for freshwater. Pari Island has limited resources of groundwater due to the small size of the area where recharge of groundwater from rainfall can take place. A problem will arise that with the increase of visitors to the island the demand for freshwater will increase, while  groundwater resources of the island are very limited and dominated by brackish and saline groundwater. The objective of this research was to explore the possibility to increase the resources of fresh groundwater of Pari Island to support the increasing demand of fresh water. The method employed in the research is the application of ASRRG technology by the injection of the largest possible volume of rainwater and monitor changes of electrical conductivity and geoelectrical resistivity. Installation of an ASRRG network proved effective in lowering the salinity of groundwater in small islands. By increasing pore volume from 30% to 60% salinity decreases by 77%, which is reflected by the effect that the fresh groundwater lens which before comprised brackish water became fresh water with a thickness of 2.5 meter. The gain in pore volume equaled the decrease in salinity.Key words: Artificial recharge, Island hydrology, Salt-water/fresh-water relations, Indonesia
UPAYA PENINGKATAN KUALITAS PELAYANAN PERIZINAN LEWAT INOVASI JEMPUT BOLA Kajian Deskriptif pada Dinas Penanaman Modal dan Pelayanan Terpadu Satu Pintu Kabupaten Semarang Provinsi Jawa Tengah Sudrajat, Yayat
Jurnal Politik Pemerintahan Dharma Praja Vol 12 No 1 (2019): Jurnal Politik Pemerintahan Dharma Praja
Publisher : Fakultas Politik Pemerintahan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (86.181 KB) | DOI: 10.33701/jppdp.v12i1.937

Abstract

Efforts to Improve Licensing Service Quality through Ball Pick Up Innovation. Descriptive Study on the Office of Investment and One-Stop Services in Semarang Regency, Central Java Province. This research is intended to find out how the innovation of licensing services by picking up the ball in improving the quality of licensing services at the Semarang One-Stop Service of Investment and Integrated Services. Other objectives are to find out the factors that hamper the path of innovation in pick-up licensing services and to find out the efforts made by the Semarang District One-Stop Investment Service and Integrated Services to improve the quality of licensing services. In this study the author uses the theory of Basuki Johanes (2013: 179) who sees public service innovation from relative benefits, suitability, complexity, the possibility of observable experiments. The method used in this research is inductive descriptive. Data collection is done by using interview methods, documentation, and observation. Data analysis techniques used include data reduction, data presentation and conclusion drawing. The results of the study showed that in the implementation of the licensing service innovation, picking up the ball had already been running but not yet maximally. It should be noted again about the location in implementing the licensing service for picking up the ball. The limiting factor that arises is the limited number of apparatus resources, the lack of facilities that support the innovation of ball picking licensing services, implementation that is not in accordance with standard operating procedures and lack of public awareness about the importance of licensing
The Influence Of Leadership Ethics And Organizational Culture Sudrajat, Yayat; Komariyah, Imas; Sekartadjie, Gilang
SEIKO : Journal of Management & Business Vol 6, No 1 (2023): January - Juny
Publisher : Program Pascasarjana STIE Amkop Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37531/sejaman.v6i1.4355

Abstract

This study set out to determine how organizational performance is impacted by commitment, organizational culture, and ethical leadership. As a mediator in the relationship between ethical leadership and organizational performance, commitment is also examined, as is the link between organizational culture and performance. Primary data for this study is gathered through distributing questionnaires. A quantitative research strategy was used, and SEM with the SmartPLS 3.0 tool was used for data analysis. The Patimban Marine Industry in Subang Regency served as the study's site and its 97 respondents served as the research sample. The study's conclusions indicate that dedication, organizational culture, and ethical leadership all significantly improve organizational performance. Additionally, it showed to be positively significant between organizational cultural commitment and the impact of organizational culture on organizational performance as a mediating variable through commitment. However, ethical leadership has little of an effect on commitment, and it has much less of an effect on organizational performance when it acts as a facilitator of commitment. Keywords: Performance Organization; Leadership Ethics; Culture Organization; Commitment
IDENTIFICATION OF SEAWATER INTRUSION DISTRIBUTION PATTERNS USING 2D ELECTRICAL RESISTIVITY TOMOGRAPHY (ERT) DATA IN SEMARANG, INDONESIA Minarto, Eko; Utami, Amanda Rizky; Handayani, Lina; Sudrajat, Yayat
Indonesian Physical Review Vol. 8 No. 2 (2025)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v8i2.461

Abstract

Various environmental problems exist in the northern coast area of Semarang, Indonesia, including land subsidence, tidal flooding, increased chloride content in several monitoring wells, and salinity in resident wells. These issues indicate a decrease in groundwater quality caused by seawater intrusion. Sanitary and health issues have a significant impact on many environmental issues, including decreased soil fertility and building damage. The problem of seawater intrusion can be identified by the geoelectric resistivity method (multi-electrode dipole-dipole configuration). The aim of this research is to detect the presence of seawater intrusion in groundwater zones and determine the extent of its distribution to the mainland. Data collection was carried out along the western canal flood. The data obtained distribution of subsurface apparent resistivity values. Interpretation of the 2D cross-sectional model identified as a seawater intrusion zone with low resistivity (???? < 3 Ω m) ranging from 0-2.600 m. Thick in the northward with a depth of 30-60 m and becomes thin in the south at 2.600 m. At a trajectory 2.600-7.000 m low resistivity is still found in a local spot. The result of the 2D cross-section model inversion shows very good result. Predicted data is quite close to the observed data shown by an average small RMS 2.37% - 4.11%. And shown by a fast convergence curve. The coastal area of Semarang is also found to be made up of five layers: alluvial soft clay, silt clay, sandy clay, granule sand, and coarse sand. These results fit with the well log data around the research area. Estimates of the distribution of seawater intrusion in more detail to the mainland need to be further investigated using other geophysical methods and testing of monitoring wells or resident wells around the research area for more accurate results.
Co-Authors Ananta Purwoaminta, Ananta Eddy Zulkarnaini Gaffar, Eddy Zulkarnaini Edi Prasetyo Utomo, Edi Prasetyo Endar Widi Sugiyo, Endar Widi Gilang Sekar Tadjie Imas Komariyah Lina Handayani Utami, Amanda Rizky