Study on magnetic properties of iron sand on the Logending beach sand has been done. The research aims to identify the mineral content and characterization of magnetic properties on the Logending beach sand. The irond sand samples taken from the Logending beach with several lokation. Sand then dried, determined density and magnetic content is separated using a permanen magnet. The iron sand were analyzed using XRD ( X-ray difraction) and characterization of magnetic properties using the VSM (Vibrating sample magnetometer). The research shows that minerals are contained hematit (Fe 2 O 3 ), with a value of susceptibility is 0.43 x10-6 m 3 /kg. The main magnetic mineral of iron sand from logending beach is paramagnetic.
The wave energy power generation-pendulum system (WEPG-PS) is a four-wheeled instrument designed to convert wave power into electric energy. The first wheel is connected to the pendulum by a double freewheel, the second and third are ordinary wheels, while the fourth is a converter component that is axially connected to the electric generator. This design used the Euler-Lagrange formalism and Runge-Kutta method to examine an ideal dimension and determine the numerical solution of the equation of motion related to the rotation speed of the wheels. The result showed that the WEPG-PS' converter system rotated properly when its mass, length, and moment of inertia are 10 kg, 2.0 m, and 0.25 kgm2, respectively. This is in addition to when the radius of the first, second, third, and fourth wheels are 0.5, 0.4, 0.2, and 0.01 m, with inertia values of 0.005, 0.004, 0.003, and 0.1 kgm2. The converter system has the ability to rotate the fourth wheel, which acts as the handle of an electric generator at an angular frequency of approximately 500 - 600 rad/s. The converter system is optimally rotated when driven by a minimum force of 5 N and maximum friction of 0.05. Therefore, the system is used to generate electricity at an amplitude of 0.3 - 0.61 m, 220 V with 50 Hz. Besides, the lower rotation speed and frequency of the energy converter of the WEPG-PS (300 rad/s) and induction generator (50 Hz) were able to generate electric power of 7.5 kW. ©2020. CBIORE-IJRED. All rights reserved
Sintesis dan karateristik pigmen warna hitam, merah dan kuning berbahan dasar pasir besi telah dilakukan. Tujuan penelitian ini adalah sintesis dan karakterisasi pigmen menggunakan bahan baku pasir besi menggunakan metode kalsinasi. Pembuatan pigmen warna hitam dilakukan dengan mencampurkan pasir besi dengan larutan NaOH dan NH4OH lalu dipanaskan pada suhu 800 °C. Pigmen merah dibuat dengan melarutkan pasir besi dalam larutan H2SO4 dan dipanaskan pada suhu 650 °C. Sedangkan pigmen kuning dibuat dari serbuk pigmen merah lalu dilarutkan ke dalam larutan HCl serta dipanaskan pada suhu 250 °C. Serbuk pigmen dikarakterisasi mengunakan XRD, SEM-EDX dan PSA dan Crommameter. Hasil penelitian menunjukkan bahwa serbuk pigmen warna hitam, merah dan kuning memiliki struktur kristal kubik dengan bentuk morfologi permukaan dan ukuran butir sebagai berikut: pada pigmen hitam partikel berbentuk butiran bulat seragam dengan ukuran butir 926,4 nanometer, pigmen merah memiliki bentuk butiran bulat seragam dengan ukuran butir 72,2 nm dan pigmen warna kuning memiliki bentuk butiran bulat seragam dengan ukuran 349 nm. Kandungan utama unsur pigmen hitam, merah dan kuning adalah besi (Fe) dan oksigen (O). Serbuk pigmen warna hasil uji colorimetri coordinat L*a*b* yaitu pada pigmen warna hitam nilai L*a*b* dan DE adalah 23,76; 1,35; 1,43 dan 2,34, pigmen merah 43,23; 16,00; 17,30 dan 9,89, dan pigmen warna kuning 66,76; 14,84; 49,95 dan 4,862. Pigmen warna yang dihasilkan telah sesuai dengan standar.
A research of design of double layer collimator using 9 Be(p,n) neutron source has been conducted. The research objective is to design a double layer collimator to obtain neutron sources that are compliant with the IAEA standards. The approach to the design of double layer collimator used the MCNPX code. From the research, it was found that the optimum dimensions of a beryllium target are 0.01 mm in length and 9.5 cm in radius. Collimator consists of a D2O and Al moderator, Pb and Ni as a reflector, and Cd and Fe as a thermal and fast neutron filter. The gamma filter used Bi and Pb. The quality neutron beams emitted from the double layer collimator is specified by five parameters: epithermal neutron flux 1 ×10 9 n/cm 2 s; fast neutron dose per epithermal neutron flux 5 ×10 13 Gy cm 2 s; gamma dose per epithermal neutron flux 1×10 13 Gy cm 2 s; ratio of the thermal neutron flux of epithermal neutron flux 0; and the ratio of epithermal neutron current to total epithermal neutron 0.54.
An analysis on the distribution of particle flux emanating from reactions of 30 MeV-proton with beryllium target in a double layer beam shaping assembly (BSA) has been carried out using the PHITS program. It studies important parameters relating to the distribution of proton, neutron, and gamma. It is revealed that reactions of proton and beryllium in double layer BSA produce fast neutrons and other protons, resulting from certain reactions, and recoil protons from the interactions of fast neutrons and hydrogen atoms. Fast neutrons are distributed around beryllium target, moderator, reflector, and collimator. They are moderated by Al and LiF material. Epithermal neutrons spread along the moderator, with a distribution that is tapering down as it approaches the end of the collimator (aperture). During its travel along the moderator, an epithermal neutron decreases in energy to become a thermal neutron. The spectrum of neutron beam produced by the double layer BSA is wide, which indicates that the neutron beam exiting the aperture consists of three kinds of neutrons, dominated by epithermal neutronswith energy range 1 eV – 10 keV.
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