Eksplorasi minyak bumi dari sumur-sumur yang sudah tua menghasilkan minyak dengan kandungan air tinggi. Hydrocyclone suatu alat yang berfungsi untuk pemisahan cair-cair berdasarkan perbedaan berat jenis setiap komponen. Pemisahan ini terjadi dikarenanakan adanya gaya sentrifugal dan gaya gravitasi yang dihasilkan dari bentuk hydrocyclone yang seperti kerucut. Perancangan dan pembuatan hydrocyclone menghasilkan alat dengan spesifikasi sebagai berikut : diameter pipa masukan : 25,4 mm, diameter cylindrical section : 120 mm, tinggi cylindrical section : 120 mm, tinggi cone section : 600 mm, diameter pipa overflow : 25,4 mm, diameter pipa underflow : 25,4 mm. Laju alir optimum untuk pemisahan air-minyak tanah pada hydrocyclone adalah 91,8 liter/menit dengan kadar minyak tanah di overflow sebesar 11,4% dan kadar minyak tanah di underflow sebesar 3%.Petroleum exploration from old wells produces oil with a very high water content. Hydrocyclone is a device that functions for liquid-liquid separation based on differences in specific gravity of each component. This separation occurs due to the presence of centrifugal forces and gravitational forces resulting from cone-like forms of hydrocyclone. The design and manufacture of hydrocyclone produces tools with the following specifications: input pipe diameter: 25.4 mm, cylindrical section diameter: 120 mm, high cylindrical section: 120 mm, cone section height: 600 mm, overflow pipe diameter: 25.4 mm, underflow pipe diameter: 25.4 mm. The optimum flow rate for the separation of water-kerosene on hydrocyclone is 91.8 liters / minute with the level of kerosene in overflow of 11.4% and the level of kerosene in underflow of 3%.

Lately, many people tend to use GSM cards to meet their needs. Good for sending short messages, calling, using social media, and so on. According to research, the latest research notes that internet use in Indonesia from students is predicted to reach 30 million. This study traces the online activity of a sample of students involving 400 respondents aged 10-19 years in Bogor district and representing urban and rural areas. As many as 98% claimed to be internet users. Source: kompas.com. The number of GSM card makers, such as Indosat, XL-Axiata, Telkomsel, and others, creates a lot of confusion among students in using the GSM starter pack because it doesn't suit their needs, so they often change the GSM starter card. Therefore, the purpose of the research is so that students can choose the GSM card wisely according to their needs in the form of analysis data and so that the analysis data can be used by GSM companies in marketing the starterpack. This study uses the game theory method with data sources from direct sources who interviewed 100 students in the Bogor district asrespondents. Based on the analysis carried out, it is concluded that the signal strength that gets the greatest results is 8.193. This proves that people, especially students, use GSM cards, judging from the strong signal of a GSM card.

Psychological traits like anxiety have long been linked to influencing test performance. Since the Covid-19 pandemic where tests are now conducted online, what students feel and experience may be different too. This study was born to investigate the students’ anxiety level during taking tests online, which anxiety type influences their online test-taking most, and how the overall correlation is. A total of 40 students in the second semester of the English Language Education Department in UIN Sunan Ampel Surabaya were asked via an online questionnaire. The result showed within 40 participants, only 6 of them were in an advanced level of English proficiency, around 452.15 on average, which had not exceeded 500 as the EFL university standards. While related to their test anxiety, anxiety management gave the most influence on their anxiety, and reading comprehension is the opposite. More importantly, related to the correlation of English proficiency and test anxiety, the result of this study showed the Pearson’s correlation coefficient between EFL learners’ anxiety and their English proficiency score is rs = -.144. It means the statistical analysis shows there was a correlation between EFL remote learners and their English proficiency test, although it was weak. It can be concluded that although students had a distant English proficiency test, the influence of their test anxiety was not really significant for weak correlation and only in a medium range.

Kelompok Wanita Tani (KWT) Rengganis di Desa Arjasari Kabupaten Bandung merupakan kelompok yang bergerak dibidang pengolahan hasil panen dari petani setempat menjadi produk yang bernilai jual lebih ekonomis. Salah satu  kegiatan yang telah dilakukannya adalah mengolah tanaman seperti jahe, kunyit, dan rempah lainnya  menjadi serbuk dan diolah menjadi  minuman herbal. Kegiatan tersebut sangat bermanfaat mengingat pada saat ini minuman herbal sebagai bahan aditif yang dapat meningkatkan daya tahan tubuh semakin diminati oleh masyarakat luas. Tujuan PkM ini adalah mening­katkan masa simpan bahan baku herbal dengan cara mengubahnya menjadi simplisia, selanjutnya dijadikan serbuk dan diekstraksi untuk dijadikan serbuk melalui proses kristalisasi pada suhu 90°C selama kurang lebih 1 jam. Program PkM Polban ini diawali dengan memberikan beberapa materi  tentang peningkatan mutu produk yang dimulai dari persiapan bahan, pencucian, pengeringan, ekstraksi dan kristalisasi. Selanjutnya mempraktikkan cara menggunakan alat perajang, grinding dan kristalisasi. Untuk mening­katkan baik jumlah dan mutu dari serbuk herbal siap minum ini juga diper­kenalkan tentang metode lain yaitu maserasi bertahap. Pasca penyuluhan, metode ini telah diterapkan oleh KWT dalam produksi jahe merah dan terbukti dapat meningkatkan rasa dan jumlah produknya. Seiring dengan itu permintaan pasar saat ini sudah mulai meningkat dengan indikasi naiknya jumlah penjualan per bulannya hingga hampir 200%. Target ke depan diharapkan KWT Rengganis dapat menampung hasil tanaman herbal dari petani setempat lebih banyak lagi dengan mengeringkan menjadi simplisia terlebih dahulu sebelum diolah menjadi produk. Dengan demikian produksi dapat menjadi lebih efisien dan ekonomis. Selain itu diharapkan kedepan KWT Rengganis memiliki rumah produksi yang memenuhi standar SNI.

– The task of Army Aviation Operations is carried out in remote areas where airport services are still minimal, the process related to refueling for pilot helicopters is an obstacle in carrying out the pilot's main tasks. So, we need tools to make the process more effective. This research uses a method that will obtain quantitative data for research to prove the hypothesis. The method is known as the Development Life Cycle Waterfall Diagram and experimental research. Currently still using a hand pump, therefore it is necessary to have a tool that is portable and uses an electric pump. specifically for fuel which is controlled by Arduino and the android application as input for a filling command and can store charging data. In this case the tool system uses supporting components, namely batteries, Bluetooth hc 05, 5v relays and flow sensors. With the research on portable pump tools, the process can be more efficient than hand pumps. When refueling the helicopter, it is enough to enter the charging value from the android application, the charging is already running, and the charging data is stored in the android file.