BIOMEJ

Analysis of the Application of Occupational Safety and Health Signs as an Effort to Reduce Risks in Building Construction Projects

Mega Cattleya Prameswari Annissaa Islami, Rizqi Novita Sari, Sinta Dewi — Thu, 30 Nov 2023 00:00:00 +0000

The construction area is the area that has the most sources of danger. UPN "Veteran" East Java is currently constructing several buildings, such as the addition of lecture halls or the construction of laboratories. The density of the campus area with thousands of students around the construction project makes the risk of danger high. Several cases of students slipping and tripping in the construction area due to scattered building materials, making the application of safety signs need to be considered. This study aims to determine how necessary safety signs are for work safety on the UPN "Veteran" East Java construction project. Where the population used in this activity is students with a sample size of 30 people. The methods used are statistical methods of the ANOVA test, Ergonomic Checklist, and Questionnaire of understanding of safety signs. The results of data processing concluded that the application of OHS signs is needed, especially signs of danger of falling goods, tripping warnings, slipping warnings, and slippery floor warnings

Inventory Control Analysis Using Economic Order Quantity (EOQ) in the Pekalongan Batik Industry

Famila Dwi Winati, Titi Indarwati — Thu, 30 Nov 2023 00:00:00 +0000

One of the economic sectors that is able to provide a significant increase in Indonesia's economic growth is MSMEs, which operate in the creative industry sector. On the other hand, MSMEs are a business sector that is often faced with uncertainty. One of the batik MSMEs in Pekalongan was forced to face post-disruption effects such as a pandemic, which had an impact on decreasing demand and increasing supply. Therefore, strategies are needed to remain competitive in the market, one of which is inventory management. The EOQ model is used in this research to minimize raw material inventory costs by determining the economical order quantity (Q) in one of the Pekalongan batik industries. The results of this research provide a concrete reference for MSMEs to plan their supply of fabric raw materials, starting from determining order frequency, reorder points, and safety stock. The optimal order quantity for MSME raw materials is 10,189 meters, with an order frequency of 35 times in the planning horizon. The safety stock level that must be prepared is 3,988 meters, and the reorder point is 6,362 meters to meet demand during lead time. Through the proposed inventory planning, MSMEs can save inventory costs and allocate resources for other purposes.

Analysis of pH Regulation on the Ca/P Ratio of Green Mussel Shell Hydroxyapatite using the Sol-Gel Method

Luluk Edahwati, Sutiyono, Suprihatin, Titi Susilowati, Sri Muljani — Thu, 30 Nov 2023 00:00:00 +0000

Kandungan kalsium karbonat dari cangkang kerang hijau dapat dimanfaatkan sebagai salah satu material. Hidroksiapatit merupakan mineral utama yang menyusun tulang dan gigi sehingga memiliki kemiripan dengan bagian mineral pada tulang. Penelitian dilakukan untuk Konsentrasi reagen asam fosfat yang digunakan dan pH reaksi pada perolehan rasio Ca/P dari Hidroksiapatit yang didapatkan melalui proses sintesis dengan menggunakan metode sol-gel. Proses presipitasi calsium carbonat dilakukan dengan menambahkan air sebanyak 50 ml kedalam larutan H₃PO₄dengan konsentrasi 1M kemudian diaduk selama 3 jam menggunakan magnetic stirrer dengan kecepatan pengadukan sebesar 300 rpm, pH dijaga 8 – 12 ( variabel ) menggunakan bantuan NaOH. Selanjutnya larutan dilakukan penuaan (waktu aging) pada suhu kamar selama 20 jam sampai terbentuk gel. Gel yang telah terbentuk disaring menggunakan kertas saring watman. Selanjutnya gel dipanaskan dalam oven dengan suhu 105 selama 2 jam. Serbuk yang dihasilkan kemudian difurnace pada temperatur 600^oC selama kurang lebih 6 jam supaya membentuk serbuk kering Hidroksiapatit. Rasio Ca/P terbaik sebesar 1,6708 dengan penggunaan H₃PO₄ sebesar 1M serta pH sebesar 11.

Struvite Mineral Synthesis from Laundry Waste Water

Sutiyono, Luluk Edahwati, Indah Nur Fauziyah, Lusy Larasati A — Thu, 30 Nov 2023 00:00:00 +0000

Struvite is a white crystal chemically known as magnesium ammonium phosphorus hexahydrate (MgNH₄PO₄.6H₂O). This mineral has a hardness of 1.5 to 2 Mohs. Struvite is easily soluble under acidic conditions and slightly soluble under neutral and alkaline conditions. In industry, struvite is found in the crust of pipes through which hot fluids pass. Struvite is often used as fertilizer because of its phosphate content. The formation of struvite minerals (hereinafter MAP) from laundry waste water is carried out using an aeration tank. MAP solution is made by reacting laundry waste water with Phosphoric Acid (H₃PO₄) and Ammonium Hydroxide (NH₄OH). The MAP ratio was set at 1:1:1 with a temperature of 20 - 40 oC and an air flow rate of 0.5 - 1.5 liters per minute. The best results were at a temperature of 25oC with an air flow rate of 1 (Liter / minute) with a magnesium content of 10% and phosphorus of 42%.

The Capstone Design of Solar Farm for Alternative Energy

TP Sari, RB Anggoro, RA Raharjo, ST Umaroh — Thu, 30 Nov 2023 00:00:00 +0000

The capstone design integrates advanced technologies to optimize energy capture, storage, and transmission, addressing key challenges in traditional solar farm configurations. The study delves into the conceptualization, engineering, and performance evaluation of the proposed solar farm, emphasizing its potential for enhanced efficiency and sustainability. Additionally, the article discusses the environmental impact and economic viability of the free space solar farm, highlighting its role in advancing the transition to a more sustainable and resilient energy infrastructure. The results of this design use polycrystal type solar panels with a panel length of 1995mm and a width of 990mm which will be installed on empty land that has been provided with a land area of 80m x 40m, 50 rows of solar panels are obtained and the total energy produced before being converted into KWP with a total of 50 rows of panels is obtained 325 WP and multiplied by the total existing panels, namely 36 solar panels, the result is 11,700 WP, then converted to KWP and the result is 585 KWP for 1 day. The findings contribute valuable insights to the field of renewable energy engineering, offering a comprehensive understanding of the practical application of free space for solar energy generation.

Design of Sensor-Based Semi-Automatic Car Wash System Prototype and it’s Gear Box Conveyor Calculation

Thu, 30 Nov 2023 00:00:00 +0000

The rapid and widespread development of science and technology (IPTEK). Particularly in the automotive industry has encouraged the development of the automotive industry, especially in four-wheeled vehicles or also known as cars. Given the number of vehicles that are still quite a lot, maintenance, care and repair must be carried out for the smooth running of the car's work process so that the car's work process runs smoothly. One of them is the system of car washing. In the process of washing a car, the uses of human power (manual) still predominant. This automatic car wash system is the perfect solution to save time and effort. Based on this, a designed small-scale sensor based semi-automatic car wash miniature was made. Supporting components are needed so that the automatic car wash system can work according to the desired design, including Ultrasonic sensors, DC motors, dynamo motors, Water Pumps, 12V fans. The main objective of this simulation is the development of criteria to design and build a car wash of this type-high real way to solve the challenges of automation. The research results show that the proposed method is in process control not only increases productivity, speed, accuracy and safety, but also reduces the time and cost of washing dynamic vehicle models.

Comprehensive Analysis of Coefficient of Performance (COP) Calculation in Peltier Refrigeration Systems

R. D. Issafira, W. Saputro — Thu, 30 Nov 2023 00:00:00 +0000

This study delves into the intricate domain of Peltier refrigeration systems, focusing on the crucial parameter of Coefficient of Performance (COP) as a key metric for system efficiency. Peltier devices, known for their solid-state thermoelectric cooling capabilities, have gained prominence in various applications, including electronics cooling, medical devices, and space exploration. The research encompasses a comprehensive review of existing COP calculation methodologies, considering the unique characteristics and operational principles of Peltier modules. Various factors influencing COP in Pertier refrigeration, such as temperature differentials, electrical input power, and thermal resistances, are analysed in detail. Additionally, the impact of material properties, design considerations, and environmental conditions on COP is explored. Furthermore, the research addresses challenges and opportunities in optimizing COP for Pertier refrigeration, considering the trade-offs between efficiency, cost, and practical implementation. Insights from this study aim to contribute to the ongoing efforts in enhancing the sustainability and effectiveness of Peltier refrigeration technologies across various industries.