Judul: Analisis Kualitas Air Hasil Modifikasi Distilasi Air Dengan Menggunakan Ultrasonic Atomization
Abstrak: Air merupakan salah satu sumberdaya alam yang berperan penting dalam kehidupan makhluk hidup. Jika tidak diperhatikan kualitas dan kebersihannya, maka air tersebut dapat mengganggu kesehatan manusia. Distilasi merupakan salah satu metode yang digunakan untuk memperoleh cairan murni dari cairan yang telah tercemari zat terlarut. Pada penelitian ini akan dilakukan modifikasi alat yang digunakan pada proses distilasi air. Penelitian ini bertujuan menganalisis kualitas air baku dan air distilasi serta menganalisis efektivitas distilasi air menggunakan ultrasonic atomizer. Parameter pada kualitas air sangat beragam, tetapi pada penelitian ini digunakan beberapa parameter yaitu suhu, kekeruhan, padatan tersuspensi (TSS), derajat keasaman (pH), dan daya hantar listrik (DHL). Penggunaan atomizer pada proses pengolahan air sudah mampu meningkatkan kualitas air pada beberapa parameter, tetapi pada sumber air tertentu kualitas air yang dihasilkan menurun. Penggunaan atomizer pada proses distilasi tidak meningkatkan kualitas air dengan optimal. Sumber air Sungai Ciapus memiliki laju distilasi terkecil. Sumber air keran memiliki laju distilasi terbesar., Water is one of the natural resources that play an important role in the life of living things. If the quality and cleanliness are not considered, then the water can interfere with human health. Distillation is one of the methods used to obtain pure liquids from liquids that have been contaminated with solutes. In this study, modifications of the tools used in the water distillation process will be carried out. This study aims to analyze the quality of raw water and distilled water and analyze the effectiveness of water distillation using an ultrasonic atomizer. Parameters on water quality vary widely, but in this study several parameters were used, namely temperature, turbidity, suspended solids (TSS), acidity (pH), and electrical conductivity (DHL). The use of an atomizer in the water treatment process has been able to improve water quality in several parameters, but in certain water sources the quality of the water produced decreases. The use of atomizer in the distillation process does not improve water quality optimally. The water source of the Ciapus River has the lowest distillation rate. The tap water source has the greatest distillation rate.
Keyword: Atomizer, distillation rate, quality, water distillation

Judul: Design and Performance Test of an Aerator using Venturi Tube Methods as Finebubble Generator
Abstrak: Oksigen merupakan hal penting bagi makhluk hidup di darat maupun di air. Oksigen yang terdapat di air disebut DO (Dissolved Oxygen) merupakan salah satu faktor penentu kualitas air. Penelitian ini bertujuan untuk merancang bangun serta melakukan uji kinerja aerator dengan metode venturi tube sebagai pembangkit finebubble. Penelitian dimulai dengan penyiapan alat dan bahan, penentuan kriteria desain, ide rumusan konsep desain, pembuatan venturi tube, perakitan komponen, pengujian kinerja alat. DO meter dan software ImageJ digunakan pada pengujian kinerja alat. Hasil dari pengujian menunjukkan penggunaan lapisan saringan berpengaruh pada diameter bubble, durasi kembalinya nilai DO, dan konsumsi daya listrik alat. Kenaikan nilai DO saat aerator dirunning menunjukkan kenaikan drastis pada 5 menit pertama. Perlakuan aerator dengan tidak menggunakan saringan menghasilkan diameter sebesar 0,0067 mm dan mengkonsumsi daya listrik per menitnya sebesar 0,00036 kWh dengan durasi nilai DO kembali semula selama 7 jam 26 menit. Perlakuan dengan saringan mesh 200 dan 500 menghasilkan diameter bubble masing-masing 0,005mm dan 0,0023mm. Kebutuhan daya per menit untuk perlakuan mesh 200 dan 500 masing-masing mengalami kenaikan sebesar 25% dan 27,7% dari perlakuan tanpa saringan. Durasi nilai DO kembali semula untuk perlakuan mesh 200 dan 500 masing-masing mengalami kenaikan 23,89% dan 77,6% dari perlakuan tanpa saringan., Oxygen is important thing for organisms on land and in water. The oxygen contained in water is called Dissolved Oxygen. which is one of the determining factors for water quality. This study aims to design and perform aerator performance tests using venturi tube method as a finebubble generator. The research begins with preparing tools and materials, design criteria, conceptual ideas, making venturi tubes, assembling components, testing performance. DO meter and ImageJ software are used in tool performance testing. The results of the test show that the use of the mesh screen affects the bubble diameter, the duration of the return of the DO value, and the power consumption of the appliance. The DO value when aerator is running shows drastic increase in the first 5 minutes. Aerator treatment by without a filter produces a diameter of 0,0067 mm and consumes electricity per minute of 0,00036 kWh, duration of the original DO value for 7 hours 26 minutes. Treatment with 200 and 500 mesh screens resulted in a bubble diameter of 0,005mm and 0,0023mm, respectively. The power requirements per minute for 200 and 500 mesh treatments increased by 25% and 27,7% from untreated treatment. The duration of DO value returned to the original 200 and 500 mesh treatment increased 23,89% and 77,6% from the treatment without filter.
Keyword: Aerator, Bubble, Dissolved Oxygen, Finebubble, Venturi Tube

Judul: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
Keyword: