North Coast Of Java Research Articles

Application of the VDI 2221 method in the design of an air-to-water converter device

Indonesia's drought and water crisis problems have grown significantly in importance in recent years, especially in light of the country's fast population expansion, urbanization, and growing awareness of the effects of climate change. By 2040, there may be a clean water crisis in every region along Java's north coast, from Banten to Surabaya, according to projections made by the Indonesian Institute of Sciences (LIPI). The water crisis could be a major worldwide concern and will be a highly complicated issue. One approach to resolving the water shortage is to design an air-to-water converter device. The purpose of this research is to design a device that can efficiently and effectively convert air into water through condensation processes. The design will be based on the VDI 2221 Method. The rationale behind selecting the VDI 2221 Method is that it is a methodical approach to design that can help a designer generate and guide multiple design options. The primary mechanism of this apparatus is condensation, which turns air into dew points. The author utilized Solidworks 2020 to create the air-to-water conversion device. Through the stages of VDI 2221, the finest design outcomes were obtained from this design. The air-to-water converter mechanism in this design is constructed by version 2, which was chosen as the best option. Based on ASTM A36 material, theoretical calculations on the frame produced a safety factor of 1.45 and a maximum stress of 1.72414 × 108 N/m2. Based on the turbine shaft calculation, the maximum stress of 1.07235 × 108 N/m2 and the safety factor of 2.57379 were obtained using Aluminum 6061 material

Revitalisation Design of North Coastal Border in Lemahwungkuk Sub-District with Urban Design Element Analysis

Cirebon is one of the cities in West Java province. The city is located in the lowlands on the north coast of Java. The low topography factor is closely related to urban problems, such as slums in the Lemahwungkuk sub-district of Cirebon City. This research aims to solve urban problems because, according to the Mayor's Regulation No. 663/Kep.421-DPRKP/2021, Lemahwungkuk sub-district includes Cangkol coastal and Kesunean coastal areas among the eleven slum locations in Cirebon city. In addition, there is a plan to revitalize the coastal border area. The method used in this research is qualitative, using urban design analysis and site analysis. The data sources were obtained through interviews with 20 informants and mapping using ArcGIS 10.8 software. The concept of an environmental approach with an orientation towards the community in the design of the revitalization of the north coast area in Lemahwungkuk District emphasizes the physical environment, infrastructure, economy, socio-culture, disaster, and collaboration between the government and the community. The results of this revitalization design can also be a recommendation for development in Cirebon, West Java. In addition, it recommends conservation and tourism activities on the north coast of Cirebon, West Java. Efforts to overcome the phenomenon of urban sprawl at the research site by changing the pattern of settlements and building layout to improve the quality of the community environment and increase public space and green open space for conservation, tourism, and aesthetic functions of the region.

Building sustainable mitigation through adaptive green open space on tanjung mas sub district

Abstract Mitigation is a step to reduce the risk of disasters in a particular area. Tanjung Mas sub-district is an area that has a high potential for land subsidence and tidal flooding because it is located on the North Coast of Java. Temporary evacuation points are urgently needed to protect residents from the dangers of tidal floods and distribute logistics from volunteers. Based on community preferences, the Green Open Space in Tambak Lorok are used as an evacuation point for flood disasters. The green open space, which was initially used for sustainable water absorption, was converted into an evacuation point as a flood disaster mitigation measure. This research aims to measure the suitability of green open space as a temporary evacuation site. The research method used is a Space Syntax approach and qualitative description analysis. Based on the results of the analysis, almost all the requirements for evacuation places by the green open space location. It is easily accessible because it is on the primary residential route, easily accessible by vehicles, and has building structures higher than the road. However, the area of green open space still needs to be increased for the minimum standard capacity per person. Apart from that, the infrastructure to support evacuation, such as electricity, communication equipment, or rubber boats, needs to be improved. The construction of green open space as a temporary evacuation site needs to be adjusted to minimum standards and the needs of the population. It is also hoped that the development of green open space will be the responsibility of not only the government but also cooperation between stakeholders. Green open space isn’t just for environment impacts, but can also increase the community resilience.

Self-organisation and megaregional transport planning along the North Coast of Java

This article explores the intricate relationship between self-organisation and planning in megaregional transportation dynamics, using the North Coast of Java as a case study. Focusing on circular migration during the Eid holiday season, the study identifies the crucial roles of symmetry breaks, feedback loops and interventions in shaping transportation patterns. Specifically, the article employs qualitative methods, including interviews with key stakeholders and analysis of transportation data, to investigate the dynamics of circular migration. The findings reveal how planning interventions influence outcomes, emphasise the importance of multilevel governance, and offer insights for planning in complex systems. This work enhances our understanding of self-organisation and planning, providing valuable guidance for urban practitioners dealing with complex socio-spatial systems.

Susceptibility analysis of cuttlefish (Sepia recurvirostra) to blue swimming crab fisheries in Keboromo village, Pati

Abstract The coast of Pati Regency and its surroundings are one of the crab sanctuaries on the north coast of Java that have tended to increase in the last decade. The purpose of this study was to analyze the level of vulnerability of cuttlefish (Sepia recurvirostra) to crab fisheries in Keboromo Village, Pati. The sample used was the catch of cuttlefish by blue-swimming crab fishermen in Keboromo Village during the research period of June 2023. The productivity value was obtained from the literature, while the parameters of vulnerability were obtained from interviews with local fishermen, which were analyzed using productivity and susceptibility analysis (PSA). The average length of the cuttlefish was 80–125 mm, with a weight of 25–61.6 grams. While having a PSA score of 1.71 with an MSC score of 84.7 (limit > 80). The smaller PSA value indicates the level of vulnerability is still relatively low, so fishing activity pressure has not had a serious impact on the potential sustainability of cuttlefish.

Behavior of coastal communities in dealing with microplastic pollution in salt ponds in Cirebon Regency

Background: Cirebon Regency, as one of the national salt-producing centers located on the coast of the North Coast of Java is vulnerable to plastic waste pollution originating from rivers and marine debris that washes up on the beach. The purpose of this study was to analyze an assessment of the correlation between aspects of knowledge and attitudes towards the behavior of coastal communities in domestic plastic waste was also carried out to be used as a basis for preparing strategies for managing domestic plastic waste in coastal communities. Methods: The research method used is a combination of quantitative and qualitative methods consisting of a shoreline survey methodology, river waste abundance, laboratory analysis, statistical analysis, questionnaires, semi-structured interviews, and descriptive analysis. Findings: Pearson's correlation analysis showed that there was a strong (r=0.664) and significant (0.000) positive relationship between aspects of knowledge and behavior, then aspects of attitude and behavior had a very weak positive relationship (r=0.183) and significant (0.028). Conclusion: The community has not been pro-environmental due to the uneven distribution of available cleaning facilities. The conclusion of this study is that education, community empowerment, collaboration between village and local officials, and additional cleaning facilities are needed to reduce the problem of domestic plastic waste. Novelty/Originality of this Study: The originality of this study lies in its examination of microplastic contamination in salt ponds, directly assessing the sources of contamination from raw materials and domestic waste in Cirebon Regency, a primary salt production area in Indonesia. This focus on the direct assessment of microplastic abundance in production units, rather than commercial products, provides novel insights into the impacts of plastic pollution on food safety and local salt quality.

Maritime Activities of the Demak Sultanate: Shipping and Trade Route in the Nusantara Network (1478-1546)

This study endeavours to explain the geostrategic conditions of the north coast of Java, as well as the activities and maritime policies of the Demak Sultanate. It adopts a historiographic approach comprising heuristics based on the book Suma Oriental as a primary source and other relevant secondary sources; in-depth verification and interpretation of data from various sources; and methodical historical writing. The results illustrate (1) the geostrategic conditions of the north coast of Java, which is in the middle of the Nusantara spice route, helped make Demak and other port cities an important emporium. The region is traversed by monsoon winds that support shipping activities and has abundant teak wood resources for the shipbuilding industry. (2) Demak’s maritime activities included military expeditions to conquer the Portuguese in Malacca and several important emporiums on the north coast of Java; trade expeditions to export-import various commodities; and establishing trade partnerships with other regions, especially Malacca and Maluku. (3) Raden Patah’s maritime policy included the deployment of military expeditions to conquer the Portuguese in Malacca in 1512, establishing trade partnerships with Malacca, producing Jung ships, and building port cities on the north coast of Java as important emporiums; Pati Unus mobilized a military expedition to conquer the Portuguese in Malacca in 1521 and formed the Demak-Cirebon-Palembang military alliance; and Trenggana conquered Lampung and Banten to control the pepper trade until the conquest of the Sunda Kelapa emporium under the Pajajaran kingdom.

The performance of anchovy purse seine in the North Coastal Java Sea, Indonesia

Small pelagic fishes including anchovies in Indonesia are caught by using different types of fishing gears. However, the anchovy purse seine commonly used polyethylene (PE) as material webbing which is less effective in the North Coastal Java Sea. This study aims to describe the design and construction of the anchovy purse seine and the characteristics of this gear construction. The research was carried out in the North Coastal Java Sea of Indonesia between May and June 2021. The main data from the nine anchovy purse seine units were collected using purposive sampling. The sampling method was performed by identifying and measuring the components of the number of anchovy purse seiners. The ratio of the length of the head rope to the length of the ground rope is between 0.926 and 0.991, so the net is not exactly rectangular, but almost trapezium in shape. The anchovy purse seine was constructed using webbing polyamide (PA) with 8 mm–9 mm in mesh size, which is considered a small mesh size. It is assembled with some ropes, floats, and sinkers. The anchovy purse seine is characterized by the dominant buoyancy value, 48 % larger than the sinking force. The sinking speed is 0.15 m/s, and the sinking time is 164 s. The anchovy purse seine's design and construction are suitable for operating in the waters of North Coast of Java.

Pengaruh Islam dalam Pembentukan Kerajaan-Kerajaan di Sumatera dan Pantai Utara Jawa

This article reviews the development of Islamic kingdoms in Sumatera and the North Coast of Java from the pre-colonial to early colonial period. In Sumatera, kingdoms such as Samudera Pasai, Aceh Darussalam, and Palembang Darussalam played an important role in the spread of Islam through trade, education, and diplomacy. Samudera Pasai became the first center of trade and the spread of Islam in Indonesia, while Aceh Darussalam reached its peak of glory in the 16th and 17th centuries with its military strength and influence in Southeast Asia. Palembang Darussalam became an important trade center in southern Sumatera. On the North Coast of Java, kingdoms such as Demak, Cirebon, and Banten played a significant role in the spread of Islam. Demak, founded by Raden Patah, is known as the first Islamic kingdom in Java and played a role in overthrowing Majapahit. Cirebon developed as a religious and cultural center under Sunan Gunung Jati, while Banten became the dominant maritime and trade power in the Sunda Strait. This study uses a historical approach by analyzing chronicles, hikayat, and travel notes. The results show that the development of these Islamic kingdoms was influenced by political, economic, social, and cultural factors, including the influence of ulama, international trade, and interactions with foreign powers such as the Portuguese and the Dutch. In conclusion, the Islamic kingdoms in Sumatera and the North Coast of Java played a key role in the spread of Islam in the archipelago and in the political, economic, and cultural development of the region, providing a significant historical legacy for the development of Islam in Indonesia.

STUDI KOMPARASI KAPASITAS DUKUNG RENCANA DAN KAPASITAS DUKUNG AKTUAL FONDASI TIANG PANCANG PADA KONSTRUKSI SLAB ON PILE JALAN TOL SEMARANG – DEMAK SEKSI 2

Semarang - Demak Toll Road Section 2 with a length of 16.31 km crosses the North Coast of Java. The regional geological map shows that the North Coast of Java has alluvial soil layers with clay and silt characteristics. The results of soil investigations show that the depth of the soft layer reaches more than 60 m. This condition triggers construction engineering to support the Highway above it. One of the efforts to fulfill the elevation plan (finish grade) is the flyover concept with slab on pile construction. The planned traffic lane is laid on a concrete slab which is supported by piles with a diameter of 600 mm. With sufficiently deep soft soil layers, the bearing capacity of the foundation piles is borne by the frictional resistance provided by the soil along the piles. This comparative study compares the planned carrying capacity calculated by the empirical formula with the actual carrying capacity of the field as a result of the PDA Test. Calculations were made on 5 test poles for later comparisons were made with the PDA test record data. For the case of 14 days driving at the research location, the pile bearing capacity from the PDA test results is still below the design bearing capacity. The average actual carrying capacity obtained from the 5 test piles is 278 tons. This value is below the planned carrying capacity of the Shio & Fukui method of 381 tons, Meyerhoff's 355 tons, Biaud et al's 777 tons, and Luciano Decourt's 605 tons. At the age of the pile 14 days after the erection was completed, the results of the calculation of the bearing capacity of the Meyerhoff method are closest to the actual bearing capacity of the PDA test results with a ratio of 1.26. The next method is Shio & Fukui with a ratio of 1.36, Luciano Decourt (2.16), and Biaud et al (2.81). Some of the results of previous studies showed a positive correlation between the age after completion of the pile and the frictional carrying capacity. For this type of friction pile, this is of course very influential, so that it is possible that when it is realized that it is carried out with a longer service life, the actual bearing capacity obtained will increase. This requires further research to obtain a time relationship with an increase in pile bearing capacity, especially for locations that have deep soft soil layers such as in this study location.

Social Change and Demythologization: (A Reading of Kuntowijoyo's Novels)

This study attempts to read Kuntowijoyo's thoughts in five of his novels, namely Kereta Api yang Berangkat Pagi Hari (KAyBPH, 1966), Pasar (1972), Khotbah di Atas Bukit (KdAB, 1976), Mantra Pejinak Ular (MPU, 2000), and Wasripin dan Satinah (WS, 2003). Through heuristic and hermeneutic readings and analysis using a socio-historical approach, the following results were obtained. First, the five novels contain a common thread of relatively similar issues, namely social change. The first novel emphasizes social change in the village community in the post-war Sala region. It illustrates that the village community is still in the value system of "guyub rukun", although it has been infiltrated by the values of individualism. The second novel emphasizes social change with the setting of a market in Java. It depicts a society that is entering an era of madness (manners are violated, capital owners act exploitatively, government officials work at will); only those who are eling (remembering) and vigilant and understand the role of taste will survive life. The third novel emphasizes the social changes caused by development that is too physical, neglecting spiritual development, so that people lose their grip on life. The fourth novel emphasizes the social changes in the sub-district around Sala under the New Order regime. There is resistance from community members to the party's power, but it is subtle. Furthermore, in the last novel, social changes in the fishing community on the North Coast of Java under the New Order regime are also emphasized. The heavy pressure of socio-economic life gave birth to the myth of Ratu Adil. The treatment of the authoritarian regime was met with strong resistance: the community attacked and killed the security forces who engineered injustice. Secondly, socio-historically, the five novels show the development of problems in Indonesian society. Thirdly, all five novels show the details of the physical location of villages in Java, as well as the socio-cultural values of the people. Fourth, the novels show the author's response to the social life of Indonesian society from the beginning of independence to under the New Order regime.

Potential Conflict of Small-Scale Fishermen on the North Coast of Java: Case Study of Muarareja village, Tegal, Central Java, Indonesia

Fishing conditions on the North Coast of Java are known to experience overfishing; This then has an impact on low fisheries productivity which then triggers conflicts between fishermen, increases the poverty of fishermen, and threatens the food security of coastal communities whose livelihoods are very dependent on fish resources in the sea. Therefore, this study examines potential conflicts among small-scale fishermen in the use of fish resources and its impact on food security also the resolution of these conflicts. The method used is a qualitative approach supported by quantitative data. Data analysis refers to the structural-functional theory and conflict theory. The study results show that conflicts for livelihood mostly occur among small-scale fishermen. The forms of conflict that small-scale fishermen often perpetrate are vandalism and petty theft, with protests or sanctions that are given only to be silenced because coastal fishermen on North coast of Java still uphold Javanese culture, which prefers to live in peace and harmony. Some of the actions taken to secure food when conflict inevitably occurs are diversifying livelihoods, utilizing locally available food sources, maintaining applicable Javanese norms and customs as well as high utilization of social capital among small-scale fishermen. Conflict resolution among small-scale fishermen is usually carried out by simply being silent and forgotten over time or through deliberations mediated through religious leaders, rich fishermen (upper layer), and wise old fishermen. The dynamics of conflicts that occur among small-scale fishermen do not appear much because the existing conflicts are more latent.

Effectiveness And Composition Of Anco Net (Lift Net) In Bungko Lor Waters, Cirebon District, West Java

Cirebon Regency is topographically located at an altitude of 0-130 km above sea level and is located along the north coast of Java. Geographically and demographically, Cirebon Regency is very suitable for the development of capture fisheries potential, seen from the livelihoods of the population who work as fishermen. The potential of fishery resources in cirebon district revealed a situation is very possible to be developed in order to economic development in cirebon.The net anco ( elevator net ) is one of kinds of tools catch the fish environment friendly. very simpleOne of those potential fishing in bungko lor need to further review, relating to the operation of an instrument. The community fishermen bungko lor cirebon district is still hampered on increased productivity in an effort do police operations. The purpose of this study is to find the effectiveness and composition of the fish anco (elevator net) that is operated on day and night of the results of the water at around 6 catch bungko lor .A method of descriptive of the receipt of the data is survey and direct observation in the field as well as in data collection by staying tightly focused in a case .The sampling method of collected data based on fishermen time operating in waters bungko lor later in analysis using chi-square t test and test it. Catch the elevator anco ( net ) during research consisting of 4 types of shrimp jerbung ( penaeus merguiensis deman ), shrimp windu ( penaeus monodon ), fish mullet ( moolgarda seheli ), and bloso ( glossogobius giuris ).Shrimp jerbung catch is the most during the research 37,1 kg of ( 82 % ), shrimp windu 4,8 kg of ( 9 % ), fish mullet 3,9 kg of 7 % and fish bloso 0,9 kg of 2 %.

Pasai Muslim Diaspora in the 16th Century on the North Coast of Java

This research aims to explain the Pasai Muslim diaspora on the North Coast of Java. This research uses historical research methods which include heuristics (primary sources such as Suma Oriental Tome Pires and secondary sources such as Asian Trade and European Influence in the Archipelago between 1500 and around 1630, Sociological Historical Studies of Indonesian Society Volume 1, Islamic Archeology of the Archipelago, Critical Review of History Banten, Sunan Gunung Jati (between Fiction and fact) Grounding Islam with a structural and cultural approach), source criticism, interpretation, and historiography. The results of this research found that the process of the Pasai Muslim diaspora in the North Coast of Java occurred in the 16th century, resulting in the formation of the Cirebon Sultanate. It also shows that the Pasai Muslim diaspora had spread to parts of West Java brought by Sunan Gunung Djati. After controlling the West Java region, Sunan Gunung Djati then founded the Sultanate of Banten, led by his son, Sultan Hassanudin.
 Keywords: diaspora, Muslim, Pasai, North Coast of Java

Rob Flood Control on the North Coast of Java (Study on coastal areas of Pekalongan and Semarang)

Flooding on the coasts of Pekalongan and Semarang, North Coast of Java (Pantura), has become a severe problem for the Indonesian government. Factors causing the flood are rainfall, climate, land subsidence and rob, river conditions, tidal influence, poorer areas, land change, inappropriate flood control, damage to flood control buildings, excessive groundwater utilization, inappropriate flood management, river sedimentation, reduced water catchment areas, and runoff floods. Therefore, there is a need for an appropriate handling study to deal with these problems. This research aimed to determine the achievements of coastal flood control on the North Coast of Java. Data was collected through a literature review for secondary data, field studies for primary data, in-depth interviews with relevant stakeholders, and observation. The results showed that handling Rob flooding in coastal Pekalongan focuses on four locations: Bremi River, Meduri River, Mrican pump house, and Silempeng. Rob flood handling methods on the Pekalongan coast include the construction of concrete barriers with corrugated sheet pile (CCSP), compacted soil embankments with bamboo mattress reinforcement, and submersible pumping machines at the Mrican pump house. In comparison, rob flood management in coastal Semarang focuses on the Sringin and Tenggang rivers. The flood handling methods conducted are the provision of pumps, construction of Rob embankments and retention ponds, normalization, drainage improvements, and interconnection channels. However, handling coastal flooding needs a comprehensive and sustainable follow-up.

Kajian Sosiologi Sastra Dalam Cerpen “Di Persimpangan Pantura” Karya Tantri Pranash

A short story is a literary work in the form of prose that contains a conflict with a short, focused solution only on one incident or story. The most important thing in a short story is to reveal the author's events and ideas in such a way that the reader can understand and enjoy it. The short story "At the Pantura Crossing" by Tantri Pranash published on Kompas.com on December 11 2011 is a short story that represents social reality in the region Pantura (North Coast of Java). Precisely in the Patokbeusi area which is a prostitution area, which contains the dynamics of relationships between characters, social conflicts, and the values upheld in the film local community. The aim of this research is to analyze the content of Tantri Pranash's short story "In Pantura Intersection” using a literary sociology approach. In literary sociology, Literary works are seen as a reflection of social life and cannot be separated from consideration elements of fiction and social aspects in social life. This means studying literary sociology the relationship between literary works and people in society, as well as social processes. Method The research used in this research is a qualitative descriptive research method. With using reading and note-taking techniques as data collection techniques. Short story research results Tantri Pranash ``At the Panthura Junction'' contains (1) economic aspects, (2) aspects culture, (3) social aspects, and (4) moral aspects. These results explain that literary works reflect community life.

Analyzing seagrass species and distribution for sustainable management of coastal areas and small islands: A case study of Java Island, Indonesia

Seagrass beds are essential components of coastal communities globally, as they support productive fisheries and coastline stabilization. In view of its numerous ecosystem services, the coverage of seagrass is an important indicator of ecosystem health. However, there are conflicting data regarding Indonesia’s seagrass coverage. Some research indicates that seagrass bed areas have declined, with significant damage observed on Java Island. The objective of this study are to provide an inventory of the various species of seagrass found; present their distribution on a map; and assess the extent of seagrass cover. This seagrass study was conducted from 2014 to 2021 on the java Coast. Data were collected using a systematic literature review. The distribution of seagrass species was processed using QGIS. The coverage of seagrass analysis was conducted descriptively by considering the categories listed in the Decree of the Minister of Environment of the Republic of Indonesia 200/2004. There are 11 types of seagrass found in 13 districts along the Java Coast. Seagrass coverage are varies 3% to 80%. The health status of seagrass beds on the north coast of Java is moderate to good, while the condition of seagrass beds on the south coast is poor to moderate.

Supply chain pattern of blue swimming crabs in the north coast of Java, Indonesia

The blue swimming crabs (BSC) fishing industry in Indonesia is heading towards an imbalance between demand and sustainability of its resources, a factor in supply. The mismanagement of traceability data and information in the supply chain is suspected to be one of the causes adding to the complexity of recent BSC fisheries management. This research aimed to identify BSC supply chain patterns and their issues, especially on two coastal regencies on the North Coast of the Java Sea. The research was conducted during June and December 2023 in Cirebon Regency and Rembang Regency. The study enlisted 70 participants, comprising fishermen, traders, processors, and exporters, with data acquisition facilitated through surveys, interviews, and focus group discussions. Respondent selection employed purposive sampling, while snowball sampling identified pertinent informants within the supply chain. Data analysis encompassed qualitative description and Likert-type scale perception analysis. The findings show that the BSC fishing industry on the North Coast of the Java Sea operates as small-scale fisheries (SSF), with unique vessel types, gear, and socioeconomic conditions crucial for livelihoods. Fishermen prioritize sustainability by using small vessels and traditional gear despite limited education. The BSC supply chain involves stakeholders offering high-value products, yet by-product utilization potential is untapped, requiring improved coordination and innovation. Challenges include export standards, market fluctuations, and product safety, addressed through regulatory support and collaboration. Government regulations, fishermen groups, and data traceability enhance market transparency and sustainability. Therefore, collective action and innovative approaches are vital for long-term economic prosperity and environmental stewardship in the BSC supply chain.

The Effect of Transaction Costs on the Sustainability of Milkfish Aquaculture in North Coast of Java, Indonesia

The potential of Milkfish Aquaculture on the North Coast of Java is very promising as the source of economy to both the farmers and Indonesia. However, the challenge faced by milkfish farmers is the fluctuation of input and selling prices may threaten business. Gresik as one of the center of milkfish production faces issues in accessing the market to sell their products, hence they require intermediaries that carries transaction costs which implicitly increase their final costs. Moreover, lack of cold storage and advance processing in the area complicate and reduce the bargaining value of milkfish farmers towards its buyer. This is because milkfish has a relatively very short shelf-life without proper storage or additional processing. The research is aimed to analyze the cost structure of milkfish farmers on the north coast of Java towards farmers income. Quantitative method is employed using two analyses: Ordinary Least Square (OLS) and Mann-Whitney Comparative Test. This study found that input cost is significantly affect the milkfish farmer, while the investment and transaction costs do not affect the milkfish farmer. Although the transaction cost variable is not significant, it shows negative coefficient value which implies reverse relationship with income. The result of Comparative Test is that the transaction cost of traditional farmers is higher compared to the semi-intensive. This is because the semi-intensive aquaculture has a higher bargaining position compared to the traditional ones, so that the cost of information, negotiation and other transaction cost are lower compared to the traditional ones. This study may useful for the milkfish farmer to increase efficiencies in the production by reducing the hidden costs and improve supply chain of the milkfish industry for the sustainability of milkfish farmers and its sub-industries in Gresik.

The The Effect of Sail Layout on Fishing Vessels Hydrodynamics in The North Coast of Java Using Computational Fluids Dynamic

The fisheries sector is one of the potential sectors that contribute to Indonesia's state income, but it has often been neglected. Almost all fishing boats still use diesel engines as the main power source to propel the boat. The use of this type of fuel has an impact on increasing the level of air pollution such as CO2, SO2, and NOX in the atmosphere. However, research to reduce ship pollution, especially the combination of propulsion system for fishing boats using engines and sails, is rarely carried out. This study aims to determine the hydrodynamic characteristics of fishing vessels on the north coast of Java due to the application of numerical variations in laying sails using Computational Fluids Dynamics (CFD). The numerical simulation results show that the placement of sails in each model variation results in a change in the fluid flow pattern from bow to stern which can contribute to fuel efficiency. From the comparison of the three models, the most effective placement of sails is at the bow of the ship.