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All Journal CAUCHY: Jurnal Matematika Murni dan Aplikasi Bulletin of Electrical Engineering and Informatics Jurnal Mahasiswa Matematika ECSOFiM (Economic and Social of Fisheries and Marine Journal) Berkala Penelitian Hayati Abdi Geomedisains
Marjono, Marjono
Brawijaya University
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Dentistry Earth & Planetary Sciences Economics, Econometrics & Finance Electrical & Electronics Engineering Environmental Science Immunology & microbiology Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Nursing Social Sciences

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Wisata Virtual Penyu Untuk Medukung Pariwisata Bahari di Pantai Serang, Kabupaten Blitar Bambang Semedi; Bagyo Yanuwiadi; Marjono Marjono; Putri Dila Nur Fatimah Afionita; Novia Fara Diza; Setya Nuri Fatma Dewi
Abdi Geomedisains Vol. 2, No. 2, January 2022
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (978.491 KB) | DOI: 10.23917/abdigeomedisains.v2i2.382

Abstract

Some coast at south of East Java have been known as sea turtle nesting sites. One of that site is at Serang Beach, Regency of Panggungrejo, Blitar. Since a long time ago, Serang Beach is a favorite location for holiday because it has many beautiful and interesting spots. But, there is an educational spot, sea turtle conservation which not widely known by tourists. It shows that the publication about the existence of sea turtle still not enough. However, people must know about it because the population of sea turtle in nature is getting worse. The more people know about sea turtle will increasing the awareness to protect sea turtle. Therefore it is necessary to create an online publication during the global pandemic of COVID-19. The best solution is create a virtual tour about sea turtle at Serang Beach. Virtual tour is the best way to introduce the existence of sea turtle and give opportunities to return tourism activites which have been stucked for about two years because of COVID-19 pandemic. There are three main activities of this program including preparation, implementation, and evaluation. Preparation step includes literature studies, surveys to Serang Beach as program locations, permits and interviews with stakeholders, plotting and scripting session for virtual tourism videos. Implementation step includes video recording for virtual tour about sea turtle at Serang Beach, video editing, video publication on social media YouTube, and mentoring with partners through focus group discussions. Video virtual tour about sea turtle at Serang Beach on YouTube received positive responses from the viewers. The presence of virtual tour about sea turtle at Serang Beach increases people knowledge about sea turtle and encourage them to holiday at Serang Beach.
Suitability Analysis of Habitat and Ecotourism of Olive Ridley Sea Turtle (Lepidochelys olivacea) in Development of Turtle Conservation Strategy at Taman Kili-Kili Beach Vian Dedi Pratama; Sukandar Sukandar; Marjono Marjono; Andi Kurniawan
ECSOFiM (Economic and Social of Fisheries and Marine Journal) Vol 9, No 1 (2021): ECSOFiM October 2021
Publisher : Faculty of Fisheries and Marine Science, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.ecsofim.2021.009.01.07

Abstract

 Taman Kili-Kili Beach is designated as an Essential Ecosystem Area (KEE). 188/39/KPTS/013/2020. According to the Supervisory Community Group (Pokmaswas), in 2011-2020, there was an increase in broodstock as many as 52 turtles, and the eggs saved as many as 3323 eggs. However, since 2013 Pokmaswas data shows a decrease in the population of hawksbill and green turtles in turtle conservation areas, which is thought to be caused by climate change, global warming, and animals. This study aims to analyze environmental baselines, turtle populations, and the value of turtle ecotourism (ecological, economic values) and develop strategies to support turtle conservation at Taman Kili-Kili Beach Trenggalek Regency. The results of the adjustment of nesting habitats and turtle ecotourism, calculation of the Habitat Conformity Index (IKH) of turtle nesting, IKH = 77.77%, which belongs to the category (S1) is very suitable to be used as a conservation area and turtle nesting habitat. While the results of the calculation of the Turtle Ecotourism Conformity Index (IKW), IKW = 84.93%, which is included in the (S1) category, which is very suitable for use a turtle tourism area. The strategy for developing turtle ecotourism is in quadrant II, meaning that it utilizes the strengths possessed in the turtle conservation area by minimizing the threats that it will experience.
POTENSI FORMULASI BAKTERI PEREDUKSI NITRAT WADUK SUTAMI MALANG DALAM MENGHAMBAT PERTUMBUHAN Microcystis C. Retnaningdyah; U. Marwati; Suharjono Suharjono; N. Ajijah; Marjono Marjono; A. Soegianto; B. Irawan
JURNAL PENELITIAN BIOLOGI BERKALA PENELITIAN HAYATI Vol 14 No 2 (2009): June 2009
Publisher : The East Java Biological Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23869/343

Abstract

The problem facing in water ecosystem espescially reservoir in Indonesia is the blooming of Microcystis. The specific objective of this research was to determined the ability of indigenous bacteria formulation from Sutami reservoir, which be known have a capability of reducing nitrate, to controlled Microcystis growth. The research methodology as follow: the bacteria formulation was isolated from Sutami reservoir that had been tested having potency to reduce nitrate, than we carried out to examine the effect of that bacteria formulation toward the growth rate of Microcystis. This experiment have been done in laboratory. The formula of bacteria and Microcystis were grown together in sterilized natural media from Sutami reservoir adding with NO3-N 5 ppm. The treatment of this research were aeration and non aeration and variation of light intensity (2–3 Klux and 5–9 Klux). Incubation was done in laboratory with constant light for 12 hours per day. The abundance of Microcystis and bacteria were counted every day for 13 days. Then, the environment parameters such as pH, conductivity, concentration of nitrate, nitrite and ammonium were measured every weeks. The experiment was done with three replications at the same time using completely randomized design. The research result showed that there were found 22 species of bacteria capable to reduce nitrate in selective media, but only six species have highest potency to reduce nitrate more than 90%. The consortium of the six bacteria with abundance 4 × 107 cell/mL able to controlled the growth of Microcystis in laboratory 80–95% be started at sixth day after incubation. The bacteria consortium was found in this research can be recommended to used as bioagent active to controlled Microcystis blooming in the water if culturing of these bacteria utilize medium having no potency as source of pollutant in the water.
In Malang, Indonesia, a techno-economic analysis of hybrid energy systems in public buildings Mochammad Junus; Marjono Marjono; Aulanni’am Aulanni’am; Slamet Wahyudi
Bulletin of Electrical Engineering and Informatics Vol 11, No 5: October 2022
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/eei.v11i5.3795

Abstract

Because of the fickle nature of the renewable sources of energy production, professionals in this sector have developed hybrid renewable energy systems (HRES) that offer a constant and stable load supply. This research intends to build off-grid hybrid energy systems (HES) in Malang, Indonesia, that uses a solar generator, wind turbine, and biogas to power public buildings. The HOMER program was used to construct this model. Following the computations, multiple hybrid renewable energy system models are used to analyze each component’s capital cost and also cost of energy (COE). Furthermore, energy output, gas emissions, and a thermoeconomic assessment of several HRES models have been explored. Two ideal HRES models were evaluated: one with a biogas generator and one without. According to the research, employing a generator of biogas would reduce fuel consumption and emissions by 68.3%. This HRES model is impressive in light of Malang’s severe air pollution. Switching from diesel to biogas generator decreases NPC by 6.84%, according to the data.
A Multiplicative Extension of Weighted Hadamard Fractional Integrals Almeer Naufal Hakim; Marjono Marjono; Corina Karim
CAUCHY: Jurnal Matematika Murni dan Aplikasi Vol 11, No 2 (2026): CAUCHY: JURNAL MATEMATIKA MURNI DAN APLIKASI
Publisher : Mathematics Department, Maulana Malik Ibrahim State Islamic University of Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18860/cauchy.v11i2.43122

Abstract

This paper presents an innovative category of weighted Hadamard fractional integral operators situated within the paradigm of multiplicative calculus. The operator introduced herein broadens the traditional weighted Hadamard fractional integral by integrating the multiplicative framework of non-Newtonian calculus, thereby establishing a cohesive linkage between weighted fractional analysis and multiplicative fractional calculus. We delineate the formulation of both the left- and right-sided multiplicative weighted Hadamard fractional integral operators and explore their core analytical characteristics. Specifically, a multiplicative linearity property is demonstrated, the continuity of the logarithmic representation of the operator is affirmed, and boundedness results are extracted in weighted Lebesgue-type spaces through the application of Hölder's inequality. Furthermore, we establish that the proposed operators comply with a semigroup property, which ensures alignment with the classical framework of fractional integration. These findings illustrate that the introduced operators maintain crucial structural attributes of weighted fractional integrals while seamlessly extending them to the multiplicative context. The theoretical framework developed herein lays a foundational basis for subsequent explorations in multiplicative fractional calculus, fractional integral inequalities, and associated applications within the realm of mathematical analysis.
Optimization of Pertamax Fuel Distribution Using Clarke-Wright Savings, Nearest Neighbour, and Goal Programming (Case Study: Malang City) Tharisa Melani; Sobri Abusini; Marjono Marjono
CAUCHY: Jurnal Matematika Murni dan Aplikasi Vol 10, No 1 (2025): CAUCHY: JURNAL MATEMATIKA MURNI DAN APLIKASI
Publisher : Mathematics Department, Maulana Malik Ibrahim State Islamic University of Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18860/cauchy.v10i1.31529

Abstract

Fuel distribution optimization is crucial to meet growing demand and reduce operational costs, especially in cities like Malang, where vehicle numbers are increasing. This research addresses the distribution challenges of PT Pertamina, focusing on designing efficient routes to minimize distance, cost, and delivery time while meeting fuel demands effectively. The problem, classified as a Capacitated Vehicle Routing Problem (CVRP), is solved using the Clarke-Wright Savings (CWS), Nearest Neighbour (NN), and Goal Programming (GP). The CWS is applied to group routes efficiently by reducing travel distances, while NN determined the delivery sequence within each route. GP addressed multi-objective optimization, minimizing costs and delivery time, maximizing Pertashop demands, and optimizing vehicle use. The results show that the combination of CWS and NN algorithms reduced the total travel distance by 140 km, or 12.5% reduction. Additionally, the GP method optimized vehicle use to 13, achieving a 59.68% cost reduction and a 48.68% time savings. These findings highlight the effectiveness of combining these algorithms in fuel distribution optimization, providing a more efficient solution compared to existing routes. Moreover, this approach is adaptable to similar logistics problems, offering a foundation for further research in multi-objective optimization for distribution systems.
Co-Authors A. Soegianto Almeer Naufal Hakim Andi Kurniawan Artha, R.Y. Aulanni’am Aulanni’am B. Irawan Bagyo Yanuwiadi Bambang Semedi C. Retnaningdyah Corina Karim Cynthia Alvionita Ferima Fardan T., Mohammad Fatmawati Hidayat Hidayat, Noor Khasanah, Ninda Uswatun Kristiana, Meicicho Mardiyah Media Rahmawati Mochammad Junus N. Ajijah Novia Fara Diza Nugraha, Debby Paradita Nugroho, Febriansyah Dwi Putri Dila Nur Fatimah Afionita Rita Parmawati S., Laili Salim, Ony Lilis Setya Nuri Fatma Dewi Slamet Wahyudi Sobri Abusini Sobri Abusini Suharjono Suharjono Sukandar Sukandar Tharisa Melani U. Marwati Vian Dedi Pratama Wijayanti, Putri Yuli Harisma Wati Yundari, Yundari