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Sistem pendidikan niscaya dirancang untuk menjawab tantangan yang akan dihadapi siswa dalam pembelajaran formal agar dapat menopang dan mengembangkan budaya dan kehidupan bermasyarakat yang senantiasa dinamis dan berkembang. Siswa diharapkan memiliki keterampilan untuk menerapkan apa yang dipelajarinya didalam kelas dalam kehidupan sehari-hari. Salah satu bentuk pembelajaran yang dapat mengembangkan keterampilan tersebut adalah pembelajaran yang mengimplementasi STEM. Implementasi ini perlu dibarengi dengan pembelajaran yang menyenangkan agar siswa dapat memahami pembelajaran dengan baik. Penggunaan media pembelajaran yang tepat dapat memudahkan mengimplementasikan pembelajaran STEM yang menyenangkan. Tujuan pengembangan ini adalah membuat media pembelajaran berbasis STEM yang berbentuk Kit Sains menggunakan materi magnet dan gerak yang dapat mendukung pembelajaran yang menyenangkan. Media pembelajaran yang dikembangkan diberi nama BELATIK singkatan dari Belajar Lintasan Magnetik. BELATIK ini juga didampingi dengan panduan penggunaan. Dalam pengembangannya media ini sudah di uji secara sederhana pada sekelompok kecil siswa SMP kelas 7 dan didapat BELATIK ini dapat menarik perhatian siswa untuk belajar fisika dan memberikan perasaan reward karena berhasil menyusun kereta yang dapat berjalan. Penggunaan BELATIK dalam kelompok juga melatih keterampilan bekerja sama pada siswa. Pengembangan dan pengujian lebih lanjut masih perlu dilakukan agar BELATIK ini bisa digunakan dalam kelas.

The experiment was conducted to evaluate the production performance and egg quality of laying hens supplemented with phytobiotics and magnetized drinking water. This experiment used 2700 gauss level in Magnetized Drinking Water (MDW). The phytobiotics had two form: the non-encapsulated phytobiotics (PTO) and encapsulated phytobiotics (EPTO). There were untreated water (control) and the treated water (MDW, PTO, PTO+MDW, EPTO, EPTO+MDW). The treatments were presented by 0.6% for each treatment. The result showed highly significant (p

Technology that is growing rapidly and innovations that have sprung up in the electrical field today are driving the use of electricity as a source of energy to do work. Electric motor is one component that is very popular in the industrial world and households that are useful to human life. In addition to DC motors and induction motors, there are also 3 phase brushless direct current (BLDC) motors which are a type of synchronous motor where magnetic fields are produced by rotor and stator at the same frequency. The rotor is a moving part of the brushless direct current motor which is a place of permanent magnet called a pole. This paper discusses the performance of brushless direct current 3 phase axial flux motors with different diameters of neodymium type permanent magnets. Tests carried out using neodymium permanent magnets with diameters of 15mm x 2mm and 20mm x 2mm were tested without using a load and using load. The parameters used in testing motor performance include speed, torque, and motor power with a source voltage of 12V, 16V, 20V, and 24V. The test results shows that the speed value of a BLDC motor using permanent magnets with a size of 20mm x 2mm is greater than that of permanent magnets of 15mm x 2mm. The same thing applies to the value of the power produced while, for the value of torque when the motor uses a permanent magnet of 15mm x 2mm will be greater than that of a motor using a permanent magnet of 20mm x 2mm.

This study aims to prepare iron sand, determine the type of iron oxide, and determine the effect of washing iron sand with sonochemical methods. Iron sand samples were obtained from Jomblom Beach, Kendal Regency. Iron sand was separated using an external magnet to obtain magnetic material. The magnetic material obtained was washed using distilled water manually stirred and using the sonochemical method. The material was dried at 80 °C. Material characterization was carried out using X-Ray Fluorescence (XRF) to determine the elements contained in iron sand, Fourier Transform Infrared (FT-IR) Spectrophotometer to identify functional groups in iron sand, X-Ray Diffraction (XRD) to find out the crystal size and crystallinity of iron sand, and the Transmission Electron microscope (TEM) to determine the morphology of iron sand. The characterization results showed that the iron sand of Jomblom Beach contained Fe (72.28%), Ti (7.89%), Al (7.00%), and Si (7.60%). The iron oxide contained in the Jomblom Beach iron sand was dominated by magnetite (Fe3O4). Washing iron sand magnetic material using the sonochemical method increased the composition of the element Fe, increased the crystallinity of the magnetic material, prevented aggregation, and reduced the crystal size of the magnetic material. Magnetic material which was washed using the sonochemical method produced 79.47% Fe element, crystallinity 74.94%, and crystal size 52.78 nm.

Pusat Teknologi Akselerator dan Proses Bahan (PTAPB) BATAN Yogyakarta sedang mengembangkan sistem pengukuran medan magnet untuk alat siklotron. Pengukuran medan magnet pada siklotron diperlukan untuk mengetahui besar dan arah dari medan magnet. Sistem ini menggunakan LabVIEW untuk membuat aplikasi antarmuka (HMI) dan pemrograman sistem. Implementasi fungsi kendali menggunakan controller NI cRIO-9022 yang dirangkai dengan modul NI 9512, yang akan mengatur kerja komponen penggerak, yaitu stepper motor. Implementasi fungsi akuisisi data menggunakan DTM-151 Digital Teslameter untuk mengukur kuat medan magnet. Pengukuran menggunakan bidang koordinat kartesian (x,y). Sebuah magnet permanen digunakan sebagai objek uji pengukuran. Ukuran magnet uji lebih kecil dari dimensi pengukuran sistem sehingga dimensi pengukuran terhadap bidang magnet dibuat berukuran (100 x 100) mm. Koordinat posisi awal teslameter 1 dan teslameter 2, secara berurutan, adalah (430,720) dan (430,240). Pengujian dilakukan sebanyak 2 kali (2 posisi magnet yang berbeda). Masing-masing pengujian dilakukan 3 kali pengukuran sehingga didapatkan 6 file data. Dari jumlah file data tersebut didapatkan jumlah data dengan rata-rata 1.117 data setiap file-nya. Kecepatan putar motor yang digunakan saat pengujian adalah 25 mm/s. Laju pembacaan data sebesar 10 data/s, interval dari perubahan posisi ketika motor berputar bernilai 2,5 mm. Kata kunci—sistem pengukuran medan magnet, LabVIEW, controller,teslameter, stepper motor, metode kendali on-off, komunikasi serial. Abstract Pusat Teknologi Akselerator dan Proses Bahan (PTAPB) BATAN Yogyakarta currently developing a magnetic field measurement system for cyclotron machine. Magnetic field measurement on cyclotron is required to determine the magnitude and direction of the magnetic field. The system used LabVIEW to create an interface application (HMI) and system programming. The control function implemented by using controller NI cRIO-9022 combined with NI 9512 module, which would controlling the motion component, that isthe stepper motor. The acquisition data function implemented by using DTM-151 Digital Teslameter to measure the magnetic field. The measurement works within the cartesian coordinate plane (x,y). A permanent magnet was used as the measurement trial object. The size of the magnet was smaller than measurement dimension of the system therefore the measurement dimension of the magnetic plane was made with the size of (100 x 100) mm. The initial position coordinate of the teslameter 1 and teslameter 2, respectively, set at (430,720) and (430,240). The trial was excuted 2 times (2 different magnet position). Each trial consist of 3 times measurement, so there’s 6 data file obtained. On those data file, there’s an average of 1.117 data on each file. The motor speed was set on 25 mm/s. The data reading speed was set on 10 data/s, which would caused a 2,5 mm interval on one single data. Keywords—magnetic field measurement system, LabVIEW, controller, teslameter, stepper motor, on-off control methode, serial communication.