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Vertical and Horizontal Variability of Chlorophyll-a and Its Relationship with Environmental Parameters in the Waters of Sangihe and Talaud Islands, North Sulawesi, Indonesia Firdaus, Mochamad Ramdhan; Rachman, Arief; Fitriya, Nurul; Wijayanti, Lady Ayu Sri; Rozirwan, Rozirwan; Purwandana, Adi; Prayitno, Hanif Budi; Alfiansyah, Yustian Rovi; Sianturi, Oksto Ridho; Sugeha, Hagi Yulia
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 29, No 1 (2024): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.29.1.119-132

Abstract

The chlorophyll-a is an important biological parameter that could act as a proxy to indicate the abundance of phytoplankton and the primary productivity of an aquatic ecosystem. This paper investigates the vertical and horizontal variability of chlorophyll-a in the waters of Sangihe and Talaud Islands, Indonesia, and its correlation with water environmental parameters. In this study, the distribution of chlorophyll-a, temperature, salinity, and nutrients (NO3 and PO4) from the surface to a depth of 200 m (photic zone) was measured at 29 research stations. The results showed that the distribution of chlorophyll-a in the waters of the Sangihe-Talaud Islands was varied vertically and horizontally. The waters around the Sangihe Islands generally exhibited a higher chlorophyll-a distribution and shallower Deep Chlorophyll Maxima compared to the water around the Talaud Islands. The concentration of chlorophyll-a varied between 0.0017 and 1.2155 mg.m-3, with most of the water column in Sangihe-Talaud considered oligotrophic, although some stations or depths were mesotrophic or slightly eutrophic. The maximum chlorophyll-a concentration was found in the sub-surface layer at depths between 46 and 101 m. The low N:P ratio (<16) and N:Si ratio (<1) indicate that the water columns of Sangihe-Talaud, up to a depth of 200m, were N-limited. Based on the GAM analysis, chlorophyll-a concentration in Sangihe-Talaud waters was primarily regulated by temperature, salinity, and the N:P ratio, with weak influence from phosphate and the N:Si ratio. The analysis also suggests that primary productivity in Sangihe-Talaud is sensitive to temperature changes, indicating its vulnerability to future warming events.
SOSIALISASI PENERAPAN GOOD GOVERNANCE DALAM UPAYA MENINGKATKAN KUALITAS PELAYANAN PUBLIK DI DESA PAKUNCEN KABUPATEN SERANG Alwajir, Dede Qodrat; Rachman, Arief; Prahima, Parko; Hartoko, Gatot; Bangsawan, Try Adhi; Atomy, Sri; Amilia, Rizki; Saepudin, Eli Apud
Jurnal Akselerasi Merdeka Belajar dalam Pengabdian Orientasi Masyarakat (AMPOEN): Jurnal Pengabdian kepada Masyarakat Vol 2 No 1 (2024): APRIL-JULI
Publisher : UNIVERSITAS SERAMBI MEKKAH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32672/ampoen.v2i1.1639

Abstract

Pakuncen Village, Bojonegara Subdistrict, Serang Regency, still faces various problems in the delivery of public services, such as a lack of transparency, accountability and community participation. This results in the low quality of public services received by the community. This study aims to determine the effectiveness of socialization of good governance implementation in an effort to improve the quality of public services in Pakuncen Village. The research method used is qualitative research with a case study approach. Data collection techniques were conducted through observation, interviews, and documentation. The results showed that the socialization of good governance implementation in Pakuncen Village has not been fully effective in improving the quality of public services. This is caused by several factors, such as the lack of public understanding of good governance, the lack of facilities and infrastructure that support the implementation of good governance, and the unoptimal role of village officials in implementing good governance.
Enhanced you only look once approach for automatic phytoplankton identification Wisnu Ardhi, Ovide Decroly; Retnaningsih Soeprobowati, Tri; Adi, Kusworo; Prakasa, Esa; Rachman, Arief
IAES International Journal of Artificial Intelligence (IJ-AI) Vol 13, No 3: September 2024
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijai.v13.i3.pp3426-3436

Abstract

Conventionally, identifying phytoplankton species is challenging due to human taxonomical knowledge limitations. Advanced technology can overcome this problem. A novel model that accurately enhances phytoplankton detection and identification classification by combining asymmetric convolution and vision transformers (ACVIT) within the YOLOv8m framework is promoted with ACVIT-YOLO. The performance of this model surpasses the original YOLOv8m model, exhibiting a notable 2.4% enhancement in precision, 5.5% improvement in recall, and 1.1% gain in mAP 50 score. The enhanced effectiveness of ACVIT-YOLO compared to the YOLOv8m model, further demonstrated by the decreased giga floating-point operations (GFLOP), decreased parameter count, and compact dimensions, significantly improves the automation of phytoplankton species identification. This suggests that the ACVIT-YOLO model could produce a better prediction system for identifying phytoplankton with similar accuracy to the original YOLOv8m model but with lower computational power and resource usage.
Validasi Metode X-Ray Fluorescence untuk Analisis Ion Fe dalam activated Methyl Diethanol Amine (aMDEA) Panggabean, Aman S.; Rachman, Arief
Indonesian Journal of Chemical Research Vol 3 No 2 (2016): Edisi Bulan Januari (Edition For January)
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2016.3-ama

Abstract

A research about validation method of Fe analysis in activated Methyl Diethanol Amine (aMDEA) using X-Ray Fluurescence (XRF) has been done. Analysis of Fe ion in aMDEA was performed to find out the rising of Fe in aMDEA that will show corrosion or metal erosion is caused by aMDEA degradation and contamination or accumulation from heat stable salt that can dissolve or scrape the film coat in carbon steel. Validation is done consist of linearity, accuracy, precision, limit of detection, and limit of quantitation. The analytical performance of the XRF for determination of Fe ions is good, shown as coefficient of correlation are 0.9997, repeatability as % RSD value are 1,93 % less than 2/3 CV Horwitz 6.24 %, percentage of recovery are 103.35 % . The LOD and LOQ are 0.351 and 2.975 ppm respectively, and Fe selectivity in aMDEA at 6.4 keV. The results obtained showed the XRF can be used for the routine analysis in the determination of Fe ions aMDEA samples.
SWOT Analysis for Innovative Product of Patchouli Derivatives and Coffee Grounds Aromatherapy Candle As a Mosquito Natural Insecticide Sahla, Sadira; Ariq, Muhammad; Fadlianur, Azzahiri; Rachman, Arief; Munawarah, Auliatul
Journal of Patchouli and Essential Oil Products JOURNAL OF PATCHOULI AND ESSENTIAL OIL PRODUCT : VOLUME 2, ISSUE 2 (DECEMBER 2023)
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jpeop.v2i2.32326

Abstract

The humid environment facilitates the survival and proliferation of Aedes aegypti mosquitoes. Nowadays, there are many chemically-based mosquito repellents available in the market. However, instead of eliminating the diseases or problems caused by mosquitoes, these chemical insecticides actually give rise to new issues such as respiratory disturbances in humans. Therefore, an innovation has emerged to create OMWIS which is a botanical mosquito insecticide. The puIDRose of this study is to analyze business feasibility and develop a strategy for developing OMWIS innovative products using the SWOT analysis method internally (strengths and weaknesses) and externally (opportunities and threats). This type of research is descriptive qualitative and quantitative research using SWOT analysis. The results of the SWOT analysis matrix for OMWIS products based on the SO strategy indicate to maintain and expand cooperation with suppliers of coffee grounds, continue to develop product and packaging innovations, maintain a lower price compared to conventional mosquito repellents, and position it as an effective natural room freshener. The advantages of OMWIS compared to similar products are that it is made from natural and safe materials for both humans and the environment, serving as both aromatherapy and mosquito repellent, providing a longer-lasting fragrance due to the addition of heavy fraction patchouli essential oil, practical and easy to use, premium packaging to preserve product integrity and portability, and affordable pricing, even cheaper than similar products. With a selling price of IDR 65,000/90 mL jar, OMWIS generates a profit of IDR 21,606/jar and making it as viable business venture.Keywords:citronella, patchouli, lemon, coffee grounds, natural insecticides, mosquito, aroma therapy, OMWIS
Spatial and Temporal Distribution of Benthic Dinoflagellates on Artificial Substrate at Seribu Islands Waters Widiarti, Riani; Ilyas, Ahmad Jutrzenka; Triputra, Kresnanda; Kusuma, Muhammad Praja; Rachman, Arief; Hii, Tan Toh
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 29, No 4 (2024): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.29.4.576-586

Abstract

Damage to coral reef ecosystems and changes in water quality are capable of increasing the abundance of benthic dinoflagellates which could cause Ciguatera Fish Poisoning (CFP). Therefore, this research aimed to observe spatial and temporal abundance of those potential benthic dinoflagellates and analyze their relationship with environmental factors. Sampling was carried out on September 21-24, 2023 in Pramuka Island, Seribu Islands district, with different treatments, namely depth, location and time. Research conducted by deploy several series of artificial substrates into the waters, and the benthic dinoflagellates were collected from the artificial substrate placed in 1, 3, and 5 meter of water depths for 24, 48, and 72 hours at Odi, Mazu, and Villa Delima Piers. Cell densities were determined by enumeration using a Sedgewick Rafter Counting Chamber under a light microscope, and the relationship with environmental parameters was analyzed by using Principal Component Analysis (PCA). The results showed that 4 genera of benthic dinoflagellates which had the potential to cause CFP, were attached to the artificial substrate, namely Amphidinium, Coolia, Ostreopsis, and Prorocentrum. Prorocentrum cells were observed in highest number on artificial substrates at every treatment with different depths, locations, and times. Furthermore, the PCA analysis showed the abundance of Prorocentrum was influenced by the most typical environmental parameters at each depth, location, and time, namely temperature, nitrate, DO, and light intensity. The research provided valuable information on the benthic dinoflagellates both spatially and temporally, through international standard methods in order to prevent and anticipate negative impacts caused by CFP.
Analisis Kecendrungan Kemunculan Titik Panas (Hotspot) yang Berulang-ulang pada Periode Tahun 2018 sampai dengan 2022 di Wilayah Provinsi Kalimantan Barat Rachman, Arief; Yusuf, Maulana
Dinamika Lingkungan Indonesia Vol 12, No 1 (2025)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/dli.12.1.p.22-33

Abstract

West Kalimantan Province experiences forest and land fires every year. To detect the beginning of forest and land fires, namely by the presence of hot spots. The existence of Hot Spots (Hotspots) in the area shows that there are initial indications that forest and land fires have occurred. This research aims to determine the trends, emergence and distribution of Hotspots in West Kalimantan Province for the period 2018 to 2022. The method uses data collection techniques through obtaining hotspot data and the extent of forest and land fires via the website https:// sipongi.menlhk.go.id/. In this study, there is Descriptive Analysis and Spatial Analysis using Arc Gis 10.8 Software. as well as data processing via Excel.The results of the research show that the distribution pattern of hot spots (hotspots) in the West Kalimantan Province area is a total of 21,292 hot spots (hotspots) with the largest number of hot spots appearing in 2019 with a total of 11,804 hot spots (hotspots). With the frequent emergence of hot spots, there are 7,988 hot spots in Ketapang district, 2,562 hot spots in Sanggau district, 2,239 hot spots in Sintang district, and 1,813 hot spots in Kubu Raya district, Kapuas Hulu district has 1,093 hot spots (hotspots) and Landak district has 1,062 hot spots (hotspots).The highest area of forest and land fires in 2019 was around 151,819 Ha and the smallest area in 2020 was around 7,647 Ha. Meanwhile, the district with the highest area in 2019 was Ketapang district, covering an area of 91,388 hectares. Meanwhile, the smallest area of forest and land fires was in Singkawang city and North Kayong district with an area of 0 (Nil) in 2020. Conclusion The Ketapang, Sanggau, Sintang, Kubu Raya, Kapuas Hulu and Landak districts in West Kalimantan Province are areas with a high tendency for hotspots to appear. This shows that these areas are vulnerable to forest or land fires. Recommendations To predict the occurrence of forest and land fires in a certain area, it would be necessary to conduct a ground check or direct field inspection to determine the condition of land cover, weather and climate factors at the research location regarding the distribution of hot spots because hot spots are not necessarily fire spots. It is very necessary to carry out a field ground check
POLICY PARTNERSHIP DALAM MEWUJUDKAN KEMANDIRIAN DESA Bangsawan, Try Adhi; Rachman, Arief; Fitrianti, Rizqi; Rahayu, Luis Fiska
Batara Wisnu : Indonesian Journal of Community Services Vol. 4 No. 1 (2024): Batara Wisnu | Januari - April 2024
Publisher : Gapenas Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53363/bw.v4i1.355

Abstract

Policy partnerships between village governments, communities, and the private sector are key in realising village independence. This research analyses the role of policy partnerships in improving the welfare of village communities and accelerating village development. The research method used is literature study and case analysis. The results show that policy partnerships can encourage innovation, improve the efficiency of resource use, and strengthen community participation in village development. However, challenges such as weak coordination and differences in interests can hinder the success of policy partnerships
ANALISA GETARAN PADA BEARING BERBASIS KERUSAKAN BEARING Rachman, Arief; Hartono, Budi; Yuliaji, Dwi
AME (Aplikasi Mekanika dan Energi): Jurnal Ilmiah Teknik Mesin Vol. 4 No. 1 (2018)
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (757.212 KB) | DOI: 10.32832/ame.v4i1.987

Abstract

Bearing is one part of the machine element that plays an important role. The function of the bearing is to support a shaft so that the shaft can rotate without excessive friction. Research was done to find out the value of vibration in a critical rotation test tool to determine the extent to which a rotating axle with a certain speed of the axis rotation. This test used a critical rotation testapparatus on a bar of carbon iron with diameter size D = 25.4 mm with L = 764 mm by using coupling. From experiments used rotation of 200 to 1000 rpm, the first experiment using 1000 rpm obtained a result of vertical axis obtained 9.5 mm/s with new bearing testing was performed using 5 variations ie new bearings, abrasion, corrosion, without lubrication, clutch that is not straight. The second experiment using a abrasion bearing of 1000 rpm resulted from a vertical axis 7 mm/s. The third experiment using corrosion bearing with 1000 rpm rotation resulted from a vertical axis of 3.4 mm / s. The fourth experiment using a lubrication bearing with rpm 1000 obtained the result of a vertical axis 9.6 mm / s. The fifth experiment using a non-straight coupling yielded 14.1 mm/s. The greater the bearing rotation value leads to a large twisting angle so that it impacts most semantic vibration values on the bearing.
Policy Advocacy for The Management of the Sunan Gunung Jati Religious Tourism Area: A Participatory Communication Study in Cirebon Fiqih, Muhammad; Rachman, Arief; Faoziyah, Sitti
Strata International Journal of Social Issues Vol. 2 No. 2 (2025): August
Publisher : CV. Strata Persada Academia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59631/sijosi.v2i2.434

Abstract

This study investigates policy advocacy for the management of the Sunan Gunung Jati religious tourism area in Cirebon, focusing on the critical role of participatory communication and local actor engagement. Utilizing a descriptive qualitative approach through library research, the study analyzes scholarly literature and policy documents to understand how inclusive communication fosters community co-creation in policy planning, decision-making, and implementation. The findings reveal that participatory communication, rooted in Islamic community development principles, cultivates collective ownership and shared responsibility, essential for sustainable social transformation. The research highlights the indispensable function of diverse local actors—including religious leaders, youth groups, and NGOs—in mediating social dynamics such as conflicts of interest and resistance to change. Effective advocacy in this context demands context-sensitive communication strategies that balance cultural values, community aspirations, and policy objectives. This study concludes that strengthening community social capacity and clearly defining local actors' roles through holistic communication approaches are paramount for achieving efficient, equitable, and sustainable policy outcomes in culturally intricate environments. The insights offer valuable contributions for developing participatory policy advocacy theories and practices in Indonesia, particularly for religious tourism sites.
Co-Authors Abdul Aziz Adi Purwandana Aditya, Vishnu Agung Riyadi Alfiansyah, Yustian Rovi Alimin, Erina Alwajir, Dede Qodrat Aman S. Panggabean Amilia, Rizki Arfiyanti, Arfiyanti Ariq, Muhammad Asan, Akhmad Asriyanti Rosmalina Atomy, Sri Bangsawan, Try Adhi Budi Hartono Budi Praptono Damayanti, Widia Dwi Dede Qodrat Al Wajir Dede Qodrat Alwajir Delima Puspa Indah, Delima Puspa Dewi, Dian Andriani Ratna Diswandi Dwi Yuliaji Eli Apud Saepudin Eli Apud Saepudin Esa Prakasa, Esa Fadlianur, Azzahiri Fadliyanti, Luluk Faisal Hamzah Faoziyah, Sitti Fiqih, Muhammad Firdaus, Mochamad Ramdhan Fitrianti, Rizqi Garno, Yudhi Soetrisno Hakiki Annisa Batubara Handayani, Dwini Hanif Budi Prayitno Hanifah, Farrah Hartoko, Gatot Haryanti Haryanti Haryanti Hayati, Taureni Herry Hudrasyah Hii, Tan Toh Hikmah Thoha Hilman Ahyadi Ihsan, Iif Miftahul Ilyas, Ahmad Jutrzenka ISKANDAR Joko Prayitno Susanto Khalista Amelia Komarudin Komarudin Kusuma, Muhammad Praja Kusworo Adi Lady Ayu Sri Wijayanti Luis Fiska Rahayu M. Yogi Riyantama Isjoni Makino, Mitsutaku Makosim, Syahril Maria Dellarosawati Idawicaksakti Maulana Yusuf Megawati, Novi Meirinawati, Hanny Muhami Muhammad Amin Munawarah, Auliatul N. Aulia Asy Syifaa Nerli Khairani Nining Sari Ningsih Nizar Ali, Muhammad Nurul Fitriya Oksto Ridho Sianturi Parko Prahima Purmanto, Denny Putra Pamungkas Rahman Rahman Rahman Ratu Siti Aliah Retnaningsih Soeprobowati, Tri Riani Widiarti Riardi Pratista Dewa, Riardi Pratista Rifqi Fauzi Romadhona, Ekky Ilham Rozirwan . Rudi Kurniawan Sachoemar, Suhendar I. Sachoemar, Suhendar Indrakusmaya Safwan Hadi Sahla, Sadira Satriyo Wicaksono, Satriyo Setiarti Sukotjo Shinta Leonita Siti Aliah, Ratu Siti Nurhamidah, Lena Slamet Seno Adi Sugeha, Hagi Yulia Sukotjo, Setiarti Teguh Prayogo Triputra, Kresnanda Tumpak Sidabutar Wells, Mark Wells, Mark L Welly Wihayati, Welly Widuri, Lila Irawati Tjahjo Wisnu Ardhi, Ovide Decroly Yuliadi Zamroni Yusuf, Rizal