E-Journal Politeknik Negeri Cilacap
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Efek Pencampuran Butanol dan Diethyl Ether (DEE) Pada Pertalite Terhadap Torsi, Daya dan Brake Spesific Fuel Consumpsion Mesin Bensin 160cc
Get PDFThe increase in the volume of vehicles resulted in a crisis of fossil fuels so there is a need for alternative fuels to replace gasoline. Butanol and Diethyl Ether (DEE) are alternative fuels that can be added to gasoline. This is because the Octane Number and high O2 levels optimize combustion in the cylinder and increase torque and power and save fuel. This study compares the addition of butanol and DEE to gasoline on torque, power, and Brake Specific Fuel Consumption (BSFC). The study used a 160cc gasoline engine with a carburetor with engine speeds of 1000, 2000, and 3000 rpm. Variation of fuel mixture 5%, 10%, and 15% on gasoline. The results showed that the DEE15 mixture increased the highest torque by 28% at 3000 rpm compared to other fuel mixtures. Engine power also increases the highest by 28% when using a mixture of DEE15 compared to other fuels. Meanwhile, BSFC experienced the highest decrease of 19% when using the DEE15 mixture compared to other mixtures
Sistem Informasi Posyandu Remaja Dalam Perkembangan Kesehatan Gizi dan Konseling Remaja Menggunakan Framework Codeigniter
Get PDFGenius Youth Posyandu is the smallest health unit in the RW 14 area of ​​Sidanegara Subdistrict, Cilacap Regency which has the task of providing nutrition and health services to adolescents. So far, all series of Posyandu Adolescent activities are recorded conventionally in a book. The emergence of time inefficiency due to the limited number of cadres and the large number of young members of the Youth Posyandu. The difficulty of monitoring the development of nutritional health and nutrition counseling that has been carried out has also become a concern of cadres in the process of reporting Posyandu Adolescent activities to the Kelurahan level. system using blackbox testing. After testing this system, it was proven that all system functions were running well so that it made it easier for cadres to manage adolescent Posyandu anthropometric data, cadres to identify adolescent nutrition trends, and youth to view Posyandu data and offer counseling online
Perhitungan Pengendalian Persediaan Fast Moving Spare Part Dengan Metode Min-Max Stock
Get PDFMaintenance is an effort to maintain a heavy equipment unit to keep it in good condition. One of the techniques to maintain unit performance is by carrying out maintenance management which is a combination of various activities such as monitoring, scheduling, repairing, and inventory control. One part of maintenance management is inventory management which aims to ensure the availability of spare parts in the warehouse so that it can increase the efficiency of maintenance time. The purpose of this study is to calculate the supply of fast-moving spare parts, especially oil filters and diesel filters using the Min-Max Stock method at PT Armada Hada Graha Basecamp Kelontong. The research used a comparative quantitative method utilizing spare parts usage data from January to March 2022 and inventory stock data on March 2022. From the calculation results it can be concluded that the percentage of filter inventory between the minimum and maximum stock values ​​is 7%. It happens due to several factors, namely, materials, methods, machines, and the environment.Perawatan merupakan usaha menjaga suatu unit alat berat agar memiliki kondisi yang baik. Salah satu teknik untuk menjaga performa unit tetap dalam kondisi baik adalah dengan melakukan manajemen perawatan yang merupakan gabungan dari berbagai kegiatan seperti monitoring, scheduling, repair, serta inventory control. Salah satu bagian dalam manajemen perawatan adalah manajemen persediaan yang bertujuan untuk memastikan ketersediaan suku cadang yang ada didalam gudang sehingga bisa meningkatkan efisiensi waktu perawatan. Tujuan penelitian ini yaitu melakukan perhitungan persediaan fast moving spareparts khususnya filter oli dan filter solar dengan metode Min-Max Stock di PT Armada Hada Graha Basecamp Kelontong. Metode penelitian menggunakan metode kuantiatif komparatif dengan data yang digunakan adalah data pemakaian spareparts bulan Januari – Maret 2022 serta data stok persediaan bulan Maret 2022. Dari hasil perhitungan didapatkan bahwa prosentase persediaan filter yang berada antara nilai minimum dan maksimum stok sebesar 7%. Hal tersebut terjadi karena beberapa faktor yaitu material, metode, mesin, dan lingkungan
Pengaruh Jenis Limbah Aluminium Pada Proses Pengecoran Menggunakan Tungku Krusibel Terhadap Nilai Kekerasannya
Get PDFAluminum waste that has accumulated due to the widespread use of aluminum in household needs, daily life, and in the manufacture of industrial material components will have an impact on the environment if not handled properly. It is necessary to utilize aluminum waste in a product that has a sale value through a casting process using a crucible furnace. This research was conducted to determine the hardness differences of waste aluminum from used aluminum cans, used aluminum pots, and used aluminum wires melted in a smelting furnace. This study uses quantitative analysis and experimental research types. Tests carried out on this crucible furnace were carried out to determine the effect of the type of aluminum waste and the length of time it took to smelt the three types of material on the hardness results. The results of the Rockwell hardness test on aluminum can waste have an average value of 71.38 HRB, on aluminum pans waste it has an average value of 71.68 HRB, and on aluminum cable waste it has an average value of 53.02 HRB.
 
Efektivitas Ukuran Blok Campuran Tanah dan Hydraulic Loading Rate Pada Multi Soil Layering Guna Menurunkan Parameter Fosfat dan Surfaktan Anionik di Usaha Binatu
Get PDFThe laundry business is one of the business that produces phosphate and anionic surfactant parameters that cause eutrophication and environmental pollution. Parameters of phosphate and anionic surfactants can be reduced using multi soil layering with two stages. This study aims to analyze the effect of soil mixed block size and hydraulic loading rate on reducing pollutant concentration. The materials used in this study are andosol soil, rice husk charcoal and iron powder. The permeable layer uses gravel and pearlite media. The reactor is made of acrylic with a length of 50 cm, a width of 15 cm and a height of 50 cm. Multi soil layering systems successfully reduce concentrations to 98,603% for phosphate parameters and 99.99% for anionic surfactant parameters. The decrease in phosphate parameters and anionic surfactants is caused by physical and chemical adsorption processes by soil components and rice husk charcoal. The decrease in the parameters of anionic surfactants is also helped by the process of biodegradation of microbes in the soil
Keterkaitan antara Kadar Silikon dan Aluminium dari Kandungan Debu Tanah Hasil Perlakuan Basa atau Asam dalam Kemampuannya Mengadsorpsi Biru Metilen
Get PDFSoil dust is the most difficult object of research to find in applications, even though it is rich in silica, silicate, and aluminosilicate compounds, which are widely known as adsorbents. The physical and chemical characteristics of compounds in which the main framework is the oxides of silicon and aluminum in the material are usually related to their Si/Al mole ratio. This study aims to study the effect of changes in the levels of silicon, aluminum, and related elements in alkaline or acid-treated soil dust (DTBA) in adsorbing methylene blue (MB). The difference in the composition of the elements in DTBA is expressed in terms of the mole ratios of silicon to aluminum, (Si/Al)mole, the ratio of moles of silicon to the number of moles of aluminum and iron, (Si/(Al+Fe))mole, the ratio of moles of silicon to the number of moles of aluminum, iron, and calcium, (Si/(Al+Fe+Ca))mole, and the mole difference of silicon to aluminum, (Si-Al)mole. The quantities in moles were also tested using the levels of these elements: (Si/Al)weight, (Si/(Al+Fe))weight, (Si/(Al+Fe+Ca)weight, and (Si–Al)weight. Through linear and non-linear regression (2nd order polynomial), plotting of the concentration of adsorbed MB to (Si–Al)weight had the highest correlation coefficient (R2 = 0.9767), better than (Si/Al)mole (polynomial 2, R2 = 0.5177), (Si/(Al+Fe))mole (polynomial 2, R2 = 0.7940), and (Si/(Al+Fe+Ca))mole (linear, R2 = 0.7996) or the same based on percentage of weight, (Si/Al)weight (polynomial 2, R2 = 0.9105), (Si/(Al+Fe))weight (polynomial 2, R2 = 0.6649), and (Si/(Al+Fe+Ca))weight = (polynomial 2, R2 = 0.5601). From a number of optimizations, the adsorption of MB on DTBA was close to the Langmuir and Redlich-Peterson isotherm adsorption model, which describes that there was one layer of MB adsorbate on the surface of DTBA. With this result, soil dust resulting from alkaline or acid treatment can adsorb MB on its surface, which is determined most by the difference in the weight of silicon to aluminum
Peranan Parameter Quench dan Temper Pada Ketangguhan Carbon-Manganese Steel
Get PDFThe use of material that is specified as armor steel has a high resistant value. The quenching and tempering process is done to improve the toughness of the material. The process uses a temperature of 900oC on the quenching process with water medium and tempering temperatures of 125oC and 175oC holding time for 30 minutes. The tests include the impact test to determine the increase in the material and fractography to determine the ductility of the material. There is a decrease in the value of the impact that occurs after the quenching process. The impact value is increasing due to the tampering impact of 32 J during the quenching process to 50 J. The fractography shows brittle fractures with ridges as a feature of brittle fractures. Rapid cooling rate processes in the quenching process cause cracks in the quenching specimens.
The use of material that is specified as armor steel has a high resistant value. The quenching and tempering process is done to improve the toughness of the material. The process uses a temperature of 900oC on the quenching process with water medium and tempering temperatures of 125oC and 175oC holding time for 30 minutes. The tests include the impact test to determine the increase in the material and fractography to determine the ductility of the material. There is a decrease in the value of the impact that occurs after the quenching process. The impact value is increasing due to the tampering impact of 32 J during the quenching process to 50 J. The fractography shows brittle fractures with ridges as a feature of brittle fractures. Rapid cooling rate processes in the quenching process cause cracks in the quenching specimens
Metode Economic Order Quantity dalam Sistem Bandar Barang Bekas (SiBandar)
No full textJunk goods are no longer piles of worthless goods for businessmen who are keen to see the economic value by taking this opportunity by becoming a pelapak company to buy and sell junk goods purchased from collectors to be sold to buyers. The problems found with Pelapak include the manual recording of sales administration which has the potential to cause recording errors. Pelapak does not know for sure the stock of junk they own and those owned by collectors because the locations of the collectors are far apart. Orders of junk goods between pelapak and collectors are still via telephone so pelapak does not know which collectors are in the process of sending goods. Problems also occur on the part of collectors including unprofessional sales transactions. Based on these problems, a used goods stock management system is needed using the Economic Order Quantity (EOQ) method. The purpose of this study is to build a used goods stock management information system that can monitor the availability of used goods owned by collectors and pelapak. System development uses the prototype method and designs with concepts. The results of the research are that the system created can help find out the stock and the amount in each collector, recap sales reports, provide accurate information, facilitate business transactions and fulfill sales targets to buyers.
Barang rongsok bukan lagi tumpukan barang yang tidak berharga bagi para pengusaha yang jeli melihat nilai ekonomisnya dengan mengambil peluang tersebut dengan menjadi sebuah perusahaan pelapak jual beli barang rongsok yang dibeli dari para pengepul untuk dijual kepada buyer. Permasalahan yang ditemukan pada pelapak di antaranya pencatatan administrasi penjualan yang masih manual sehingga berpotensi menimbulkan kesalahan pencatatan, Pelapak tidak mengetahui pasti stok barang rongsok yang dimilikinya dan yang dimiliki oleh masing – masing pengepul karena lokasi pengepul yang berjauhan. Pemesanan barang rongsok antara pelapak dan pengepul masih via telepon sehingga pelapak tidak mengetahui pengepul mana yang sedang dalam proses pengiriman barang. Permasalahan juga terjadi di pihak pengepul diantaranya transaksi penjualan belum professional. Berdasarkan permasalah tersebut dibutuhkan sebuah sistem manajemen stok barang bekas dengan metode Economic Order Quantity(EOQ). Tujuan penelitian ini yaitu membangun sistem informasi manajemen stok barang bekas dapat monitoring ketersediaan barang bekas yang dimiliki oleh pengepul dan pelapak. Pengembangan sistem menggunakan metode prototype, dan merancang dengan konsep. Hasil penelitian yaitu sistem yang dibuat dapat membantu mengetahui stok dan jumlahnya di setiap pengepul, merekap laporan penjualan, memberikan informasi yang akurat, memudahkan transaksi bisnis dan pemenuhan target penjualan kepada buyer
Pengelolaan Sumber Daya Alam Hutan Studi Kasus : Hutan Kota Tinjomoyo Kota Semarang
Get PDFForest is a stable ecosystem, which has a balance between producers, consumers and decomposers. Where, the forest itself has the ability to provide unlimited natural resources. However, optimal and sustainable forest management and utilization is needed in order to have a forest that has adequate environmental carrying capacity, with the aim of guaranteeing the role and existence of the forest. The Tinjomoyo City Forest which is located in Semarang City has an area of ​​57 ha, with the area of ​​green space in Semarang City being 10,966 ha, out of the 37,367 ha area of ​​Semarang City. Thus, it has reached 30% of the need for green space in the City, if based on Law no. 41 of 1999. Therefore, because the position of the City of Semarang, which has a large green space, has complied with the Law, it is very important to maintain its existence. In this research, it was carried out by direct observation method, which included observation, inventory, and volume calculation. After carrying out an inventory and data processing, it was found that the Tinjomoyo City Forest had a volume of wood reserves of 4,548,600 m3. So with the knowledge of these large enough wood reserves, it is necessary to maintain, manage and utilize forest resources optimally and sustainably. With the aim, to maintain the availability of wood reserves in the Tinjomoyo City Forest
Evaluasi Tempat Penyimpanan Sementara (TPS) Limbah B3 di ORF Porong PT. Pertamina Gas Oeja
Get PDFPT Pertamina Gas OEJA, in carrying out its operational and instrument maintenance activities, generates hazardous waste (B3 waste) that must be carefully managed to prevent environmental pollution. This study aims to evaluate the existing condition of the Temporary Storage Facility (TSF) for B3 waste in the context of compliance with applicable regulations. The research method involves collecting data through direct observation of the TSF, followed by comparative analysis with regulations governing B3 waste management. The evaluation results indicate that the TSF is not fully in compliance with the standards of the applicable regulations. Therefore, recommendations for improvement are proposed, including increasing the capacity of waste storage, using more suitable packaging, adjusting the arrangement of packaging/containers to comply with regulations, improving the TSF\u27s roof, and adding completeness to labels and symbols. The implementation of these recommendations is expected to assist Pertagas OEJA in achieving a higher level of compliance with B3 waste management standards and reducing negative environmental impacts