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This study aims to analyze the effect of revenue on the ornamental fish business at PT. Indotama Putra Wahana. Revenue in this context refers to all income obtained by the company, both from export activities and from sales through online platforms such as Tokopedia. Business growth is defined as the increase in net profit, reflecting the sustainability and development of the company in running its operations. Therefore, it is important to analyze the contribution of income from both sources to the company’s success and growth. The data used in this study includes export revenue over the past six months and revenue from Tokopedia over the past four months. Net profit is calculated by subtracting total income from monthly operational costs. This study uses a quantitative approach with multiple linear regression analysis processed using SPSS software to obtain more accurate results. The research findings show that the ANOVA test resulted in an F value of 38.429 with a significance value of 0.007, indicating that both export revenue and Tokopedia revenue significantly affect business growth simultaneously. This suggests that both types of income play an important role in driving the company's growth. Additionally, the t-test shows that export revenue has a greater impact on business growth compared to Tokopedia revenue. The regression coefficient for export revenue is 0.987, while for Tokopedia revenue, it is 0.536. Overall, this study reveals that export revenue has a greater impact on the growth and sustainability of the ornamental fish business at PT. Indotama Putra Wahana. These findings provide deeper insight for the company to focus on export strategies to enhance net profit and ensure the sustainability of its business.

This study aims to determine the effect of coconut pulp and seawater compost on the growth of lettuce (Lactuca Sativa L). This type of research uses a quantitative method. Based on the results of the study, the treatment of coconut pulp and seawater compost on the most optimal plant height is the treatment on the 28th day because there is the greatest potential difference in treatment compared to other days and the treatment of coconut pulp and seawater compost on the optimal number of leaves is the treatment on the 42nd day, especially in treatment 5 which produces the highest number of leaves.

ABSTRAK Indonesia sebagai negara kepulauan sangat bergantung pada transportasi kapal laut untuk menghubungkan antar pulau. Pada proses perencanaan konstruksi kapal, pemilihan material lambung yang terbaik sangat penting untuk menghadapi masalah korosi. Paduan aluminium dikenal memiliki ketahanan korosi yang baik, sehingga sering dipilih untuk aplikasi di lingkungan korosif, seperti laut. Paduan seri 5xxx, khususnya Aluminium 5083 dan 5052, umum digunakan dalam industri pembuatan kapal karena karakteristik mekanis dan ketahanan korosinya. Lingkungan laut yang agresif dapat mempercepat laju korosi, mengancam integritas struktural lambung kapal. Berdasarkan hal tersebut, diperlukan pemahaman komparatif tentang perilaku kedua paduan ini dalam kondisi korosif seperti air laut. Penelitian ini bertujuan untuk membandingkan laju korosi aluminium 5083 dan 5052 dalam media air laut, dengan fokus pada faktor-faktor yang mempengaruhi korosi serta implikasinya terhadap pemilihan material lambung kapal dengan metode kehilangan berat (Weight Loss) sesuai dengan ketentuan dari ASTM G31-72. Penelitian ini menggunakan desain eksperimen dengan pengujian perendaman kedua jenis aluminium dalam air laut selama beberapa periode waktu (168 hingga 720 jam). Penelitian ini membandingkan laju korosi aluminium 5083 dan 5052 dalam media air laut selama periode waktu tertentu. Hasilnya menunjukkan bahwa aluminium 5083 memiliki laju korosi yang lebih rendah dibandingkan aluminium 5052 pada semua durasi perendaman. Analisis struktur mikro juga menunjukkan distribusi partikel magnesium yang lebih merata pada aluminium 5083, yang memberikan ketahanan korosi yang lebih baik. Penelitian ini menunjukkan aluminium 5083 memiliki ketahanan korosi yang lebih baik dibandingkan aluminium 5052 dalam media air laut, dengan laju korosi yang lebih rendah dan distribusi partikel magnesium yang lebih merata.

Sea water pollution is an increasingly urgent global issue, caused by various factors such as industrial waste, household waste, and ship activities. One of the solutions needed to overcome this pollution is the development of a detection system that is able to monitor polluting substances quickly, accurately, and efficiently. This research aims to design and build a microcontroller-based seawater pollution detection system, which can identify various pollution parameters in real-time. This research uses the Research and Development (R&D) method to develop a system consisting of several main components, including a pH sensor, turbidity sensor, Arduino Uno, GPS module, Raspberry Pi 4, USB camera, LiPo battery, and step-down converter. Each component is tested individually before being integrated into the overall system. The results of testing in a real environment show that the system is able to detect seawater pollution parameters with high accuracy. However, there are some errors in data collection, especially in the camera sensor with a percentage error of 32%, turbidity sensor 20%, and pH sensor 24%. Further improvements and developments were made based on the evaluation results to enhance system performance. The resulting system is considered accurate, reliable and easy to use, making an important contribution to efforts to protect seawater quality and mitigate the negative impacts of pollution on the environment and human health.

Porous concrete has high porosity so that water can pass through the cavities in the concrete. The application of porous concrete is usually for parking areas, pedestrian sidewalks, road shoulders, drainage, roads with low traffic volume. Indonesia is an archipelagic country, most of Indonesia's territory is by the sea so it is very possible to use sea water as a substitute for fresh water for porous concrete. This research aims to determine the comparison of compressive strength of porous concrete mixed with sea water and normal porous concrete with variations in the water cement (fas) factor. In this study, a concrete mixture with a water cement (fas) factor of 0.30 and 0.35 was used. The test object used was a 15x30 cm cylindrical concrete test object for the compressive strength test. The test on porous concrete was carried out during the curing period of 28 days. The test results for the compressive strength of normal porous concrete with a water cement (fas) factor of 0.30 and 0.35 are 6.658 Mpa and 4.435 Mpa, then for porous concrete mixed with sea water with a water cement (fas) factor of 0.30 and 0, 35, namely 6,700 Mpa and 3,374 Mpa. The test results show that the sea water mixture in porous concrete does not affect the compressive strength of porous concrete, whereas the use of variations in the water cement factor (fas) shows that the compressive strength of porous concrete, both normal porous concrete and porous concrete mixed with sea water, has decreased. as the value of the water cement (fas) factor used increases.

Lamong Bay is one of the important water areas in Indonesia, located around the coastal area of ​​Surabaya, East Java. This area has high ecological and economic value because it functions as a sea transportation route and supports marine biota. So this research is intended to monitor the quality of sea water in Lamong Bay based on benthos and plankton bioindicators. Plankton and benthos are small organisms that live in waters and are very sensitive to environmental changes. The plankton sampling method involves using a plankton net to collect plankton samples from the waters. The grab and net sampling method is a method used to collect benthos samples from the bottom of the waters. The results that can be concluded from the analysis carried out in the waters of Lamong Bay, for the type and abundance of plankton, phytoplankton are 3 classes, namely Bacillariophyta (16 species), Cyanobacteria (2 species), and Euglenozoa (1 species), and zooplankton found include Arthropods Monacilla sp. and Nauplius, Ciliophora individuals include Favella sp. , Tintinnopsis sp. , Tintinnopsis sp. 2, Tintinnopsis sp. 3 as well as individual Rotifera including Notholca sp. Meanwhile, for Benthos, only Thiaridae was found.