Judul: Sistem Kendali Intensitas Cahaya pada Tanaman Hidroponik Indoor
Abstrak: Sistem kendali intensitas cahaya dibutuhkan pada sistem hidroponik indoor karena kurangnya sinar matahari yang masuk. Penggunaan light-emitting diode (LED) dapat dijadikan sebagai pengganti cahaya matahari dalam pertumbuhan tanaman. LED memungkinkan kegiatan bercocok tanam dilakukan di dalam ruangan dengan minim cahaya. Penelitian ini bertujuan untuk membuat dan menguji prototype sistem kendali intensitas cahaya pada sistem hidroponik indoor. Sistem kendali dibuat menggunakan mikrokontroler Arduino Uno. Pengaturan intensitas cahaya dalam rentang 1440-1500 lx. Perbedaan pertumbuhan tanaman yang menggunakan tambahan LED dan tanpa menggunakan LED terlihat signifikan. Pertumbuhan dengan tambahan LED tumbuh dengan normal, sedangkan tanpa menggunakan LED mengalami etiolasi., A light intensity control system is needed in indoor hydroponic system because of the lack of incoming sunlight. The use of light-emitting diodes (LED) can be used as a substitute for sunlight in plant growth. LED allow farming activities to be carried out indoors with minimal light. This study aims to create and test a light intensity control system prototype in an indoor hydroponic system. The control system uses Arduino Uno as a microcontroller. Light intensity setting in the range 1440-1500 lx. The difference in plant growth using an additional LED and without using an LED is significant. Growth with the addition of LEDs grows normally, whereas those without using LED are etiolated.
Keyword: Control System, Indoor Hydroponic, Light Intensity, LED

Judul: Pertumbuhan Bibit Padi Sistem Hidroponik pada Berbagai Spektrum Cahaya LED
Abstrak: Light plays an important role in the growth of rice seedlings. Sowing rice seeds using hydroponic seeding racks has the disadvantage that the distribution of sunlight on the middle shelf with the lowest level has a small light intensity. The use of LED lights can increase the intensity of light in the hydroponic rack thereby increasing the productivity of the rice seedling nursery using the hydroponic seeding rack. The purpose of this study was to determine the optimum combination of LED light spectrum and to analyze the effect of the combination of LED light spectrum on the growth of rice seedlings on hydroponic seeding racks. The research was carried out by adding LED lights with a combination of red and blue lights 3:1, 4:1, and 5:1 respectively on the hydroponic rack and then analyzing the growth of the most optimum rice seedlings. Based on the results of the analysis of variance for several parameters, namely plant height, number of leaves, and leaf green level, the best treatment combination was the use of 5 red LED lights and 1 blue light at level 1 of the hydroponic seeding rack. Based on this treatment, an increase in light intensity of 6392 Lux was obtained, which was directly proportional to the results of the rice seedling nursery which produced an average rice seedling height of 19.53 cm, 2 panicles of leaves, and 2 levels of green leaves.
Keyword: hydroponics, LED lights, nursery shelve, rice nursery

Judul: Separation of Neodymium from U3Si2/Al Fuel Plate for Burn-Up Determination
Abstrak: Neodymium is a common fission product produced in nuclear fission reactions. Neodymium in this study was chosen as a burn-up indicator for U3Si2/Al fuel element plates because the neodymium isotope is a stable fission product with a fairly high yield. Some procedures were carried out to separate neodymium, starting with the separation of cesium isotopes (137Cs, 134Cs) through the precipitation method, then separation of uranium isotopes (235U, 238U) and plutonium isotopes (239Pu, 238Pu) with Dowex 1x8 ion exchange resin, and separation of neodymium (Nd), samarium (Sm), as well as cerium (Ce) with Dowex 1x4 ion exchange resin. The Cs recovery reached 99.95%. The U and Pu isotopes resulting from the separation are subjected to an electrodeposition process and the weight of each isotope can be measured with an alpha spectrometer. The separation results of Nd from Sm and Ce have been proven using an XRF spectrometer. The neodymium isotopes separation was corrected using the standard addition method, and an average total Nd content of 2.4 ppm was obtained in the PEB U3Si2/Al bottom solution. It is hoped that this separation method can be applied in determining burn-up of nuclear fuel.
Keyword: neodymium, burn-up indicator, U3Si2/Al fuel plate