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Making this soap aims to provide an explanation for making solid soap made from lemon essential oil as an effort to improve community skills and can be applied by the community in the future as a business. Soap making is done by heating coconut oil at a temperature of 800C. Mix 30% NaOH with heated oil until it becomes homogeneous, stirring continuously until the saponification process is perfect. Add the stearic acid which has been dissolved in the alcohol and stir until smooth, add the white sugar and stir again, add the glycerin while stirring, add the foam booster while continuing to stir until the mixture becomes homogeneous. Add coloring and fragrance, namely lemon oil, which is carried out at 400C. Pour the mixture into the mold and let it sit for 15-30 minutes. The soap has hardened and can be removed from the mold. The tests performed were preference, allergy, aroma, color, froth and density tests. The result shows that solid soap has been successfully made, but still requires some further refinement regarding the density and transparency of the soap. With the procedures for making soap and the analytical test that the author described above, new knowledge and skills can be used for the community as well as solid soap business opportunities

PT Kusuma Mulia Plasindo Infitex is a company engaged in the manufacturing sector that produces polypropylene and HD (Hight density Polyethylene) plastic products. The problem that occurred at PT Kusuma Mulia Plasindo Infitex was that the number of defective products on HD plastic products of 98,327 kg contained 4,194 kg of defective products. The purpose of this study is to determine the factors that cause defects and suggestions for improvements to minimize defective products. This study uses the six sigma method which is useful for finding the root causes of problems that are adjusted to the characteristics of the data they have. The 5 stages of six sigma are DMAIC(define, measure, analyze, improve, control) and kaizen is the Five M-Checklist. So from the results of data processing, the value is obtained in the form of DPMO 8393.048 and a sigma value of 2.49. Proposed improvements include providing training in plastic welding, providing additional 5-10 minute breaks and supervision while working. Perform routine machine maintenance every month and cleaning every day. Adding ventilation and blowers in the production room. Carry out the production process according to the existing SOP at the company, especially in mixing materials according to the SOP for raw materials that have been made by the company.

Analisis Kode Statis (Static Code Analysis) masuk ke dalam metode white box testing yang digunakan pada pengembangan aplikasi. Analisis ini dilakukan dengan cara mengevaluasi source code untuk mendeteksi pelanggaran kode apa saja yang terdapat dalam project aplikasi open source To Do List berbasis website menggunakan Laravel dan Vue.js. Proses analisis kode statis bertujuan memberikan pemahaman serta memastikan basic code pada project telah memenuhi standarisasi pengkodean yang telah ditetapkan. Teknik pengujian source code dilakukan melewati proses scanning pada project dengan standarisasi pengkodean yang telah ditetapkan dan diatur dalam Quality Gate SonarQube sebagai acuan untuk seberapa tinggi kualitas kode yang harus dilalui. Hasil analisis yang diperoleh melalui tool SonarQube menunjukkan pelanggaran kode yang ditemukan secara keseluruhan pada project To Do List dengan beberapa kategori issues, yaitu 4 bug, 2 security hotspots, 31 code smell, dan 117 duplicate lines of code dengan density sebesar 18,3% yang membutuhkan total waktu estimasi pengerjaan untuk perbaikan pelanggaran kode sebanyak 2 jam 35 menit.

Mortar is a mixture of materials composed of fine aggregate (sand), adhesives such as (clay, lime, portlaand cement) and water with a certain composition. Mortar can be affected by several specification factors such as density, mortar age, type of bonding material, and aggregate properties. In this study using coconut fiber ash as an added material in making mortar which has a function as an enhancer of compressive strength value in mortar. In coconut fiber ash, it has an important chemical compound for mortar, namely silica compounds which function as the main element to increase the compressive strength value of mortar. The purpose of the study was to determine the effect of adding coconut fiber ash material on the compressive strength of mortar with a percentage of 0%, 2.5%, 5%, 7.5%, 10%. From the results of the research conducted, a compressive strength value of 253 Mpa was obtained at a percentage of 10% of 7 days old and 253 Mpa at a percentage of 2.5% of 7 days old.

The concept of the smart city has emerged as a strategic response to rapid urbanization, increasing population density, and escalating environmental degradation. It is designed to create more efficient urban management through the integration of information and communication technologies, with the primary goal of enhancing public services, optimizing resource use, and improving citizens’ quality of life. One of its most significant promises is its potential to mitigate ecological challenges, particularly in monitoring and reducing air pollution levels. This study aims to analyze the impact of smart city implementation on urban ecology and quality of life, focusing on air quality as a key indicator. A quantitative comparative approach was applied, using both primary data from air quality measurements PM2.5, CO₂, NO₂, and AQI and secondary data from government reports, environmental agencies, and academic publications. The research was conducted in five major Asian cities recognized for adopting smart city initiatives. The results reveal varied outcomes: Tokyo and Kuala Lumpur demonstrated substantial improvements in air quality and livability, while Beijing and New Delhi continued to struggle with severe pollution. Jakarta showed partial progress, though improvements remain limited. These findings indicate that while technology is critical, it alone does not ensure ecological sustainability. Effective governance, public participation, and context-based strategies are equally crucial. This study highlights the need for smart city policies to prioritize ecological resilience and human well-being as central elements of sustainable urban development.

Efforts to increase income, provide employment, contribute to the availability of animal protein and increase production activities are part of food security in the aquaculture sector. Based on data reported from the DGT KKP Statistics, (2021) aquaculture can increase production activities, where in 2020 the third quarter of fish farming production reached 11.5 million tons and increased to 12.25 million tons in 2021 in the third quarter.  Alternative techniques that can be done as an effort to increase fish farming production results are optimizing the use of biofloc system technology (Pramono et al., 2018; Faridah et al., 2019 and Permana et al., 2021). This biofloc system is a union of living organic substances into the form of blobs, where this biofloc is composed of the word bio which means life while floc means blob. For example, in tilapia farming, to increase production results so that they can ... Meeting market demand can implement a biofloc system. Tilapia is classified as a type of freshwater fish that is in great demand in the market. The advantages of implementing a biofloc system in tilapia farming are environmentally friendly so that it is easy to carry out advanced cultivation, there is efficiency in water utilization, short maintenance period, and maximizing stocking density. In addition to the advantages, there are also obstacles faced, fish farming with a biofloc system such as lack of understanding of fish farming with the biofloc method, directly providing feed without paying attention and lack of water quality control. Furthermore, the research conducted implemented the observational descriptive method. 

Waste oil treatment through the distillation method with the addition of sulfuric acid and sodium hydroxide media was successfully carried out. The purpose of this study was to obtain quality diesel fuel, study the effect of the concentration of chemical media used, and determine the effectiveness of using spritus substitute fuel. Waste oil treatment is carried out using a distillation method that involves the process of precipitation, filtration and addition of acid and alkaline media. After going through the processing process, the resulting products are analyzed and tested physically and chemically such as density, specific gravity, flash point, fire point, calorific value, and kinematic viscosity. The results of physical test research and parameters were obtained at optimum conditions of use using H2SO4 and NaOH concentrations of 6%. Physical tests obtained brownish-yellow fuel while parameter tests on density tests were 817 km/m3, specific gravity was 0.801, flash point and fire point were 61°C and 72°C,while kinematic viscosity was 4.99 m2/s. The results of this test show that the fuel obtained tends to have diesel quality, so that the fuel has the potential and effectiveness to be used as a substitute for spritus in patching motorcycle tires