Helium plasma source modeling was performed in order to obtain species density at balanced conditions under pressure of 1 atm. The software used in this modeling is matrix laboratory software (MATLAB). The equation used is a continuity equation that depends on the position and parameters of Arrhenius. Plasma temperatures used were 0.1 eV, 0.2 eV, 0.3 eV, and 0.5 eV. Species involved in pla…
Today, Indonesia has an area of oil palm plantations and is the number one producer of Crude Palm Oil (CPO) in the world, which is around 24 million tons / year, which meets 47% of the world's vegetable oil needs. Production of fruit with good quantity is able to produce 23.2−27.4% CPO oil content. Farmers find it difficult to know the level of oil content in oil palm fruit due to limited…
Fiber Bragg Grating (FBG) banyak digunakan untuk mendeteksi detak jantung, karena dapat diterima dalam bentuk tekanan yang mengakibatkan perubahan regangan. FBG dipilih karena memiliki sensitivitas yang tinggi terhadap regangan. Penelitian ini bertujuan untuk merancang dan mengukur perubahan daya keluaran serta menganalisis pengaruh perubahan regangan pada FBG oleh getaran loudspeaker. Peng…
The ball milling time affects the magnetic properties its product. Research on the magnetic properties and the product composition of natural sand of the Rokan River as a function of optimum time in ball milling has been done . The natural sand samples of Rokan River that has collected with a mass of 10 Kg were dried under the sun ray before the separation process between magnetic and nonma…
Palm fruit is Indonesia's main communiqué as the largest foreign exchange contributor processed into crude palm oil (CPO). However, the quality of CPO that will be produced is influenced by the right level of maturity of palm fruit so as not to cause losses from the processor. Losses from the palm fruit processing can be overcome using a method that can determine the maturity level of the …
Fiber optics are the right transmission medium to monitor the movement of the human body. One of them is knee activity. Its small size, low cost, lightweight components, biocompatibility, high sensitivity, resistance to electromagnetic interference, and easy to apply in sensor applications make Single Mode Fiber (SMF) and Fiber Bragg Grating (FBG) as sensing sensors that can monitor damage…
Optical biosensor has greatly expanded in medical field such as monitoring human blood flow and respiratory. The sensitivity and high transmission speed make Single Mode Fiber and Fiber Bragg Grating have been growing.
Biomass-derived porous carbon is one of the most competitive electrode materials for supercapasitor due to their renewability and sustainability. Electrode materials derived from biomass for supercapacitors are considered as an effective solution to the problems of the energy crisis and the environment deterioration. In this research, the carbon electrode derives from waste of Christmas pal…
The magnetic nanoparticles were prepared from River Suci Bengkulu beach sand using two-stage ball milling for 120 hours. The product of the ball milling was divided into 3 parts and then doped using manganese (Mn) with a concentration of (0; 5; and 15)% of the total mass magnetic nanoparticles using ball milling for 20 hours. These nanocomposite (α-Fe2O3/Fe3O4+Mn) were used to adsorb some …
Supercapacitors are renewable energy storage devices consisting of electrodes, electrolytes, current collectors, and separators. Electrodes are one of the most important components in supercapacitors because they are made of nanoscale materials that have high surface area and porosity. In this study, carbon electrodes were made from palm fiber biomass waste with variations in the physical …
Anthropogenic activities such as residential, industrial and port activities in Rupat Strait give pressure on the environmental system and damage to the ecosystem. Aquatic ecosystems as the ultimate goal of disposal of anthropogenic activities accommodate waste. Research has been carried out on the quality of the waters in Rupat Strait based on several parameters to determine the distributi…
The condition of an inundated and non inundated area is influenced by geology of a particular area. This will affect the condition of the acuifer layer. This research aims to identify the groundwater aquifer layers and quality of groundwater. Measurements was conducted in Delima Village, Binawidya District by using the wenner configuration geoelectric method on two tracks with different geo…
Ujungbatu City, Riau Province has been carried out using Pasco Magnetic Probe PS-2162 and Ball Milling method. Samples were prepared using Ball Milling for 10 hours as a function of vial rotation of 100 rpm, 150 rpm and 200 rpm. The results showed that the average value of the magnetic susceptibility of Rokan River natural sand before and after being separated using an Iron Sand Separator …
The effect of the use of iron and ceramic balls in milling tubes on the magnetic susceptibility of natural sand of Rokan River in Riau Province has been carried out. The samples were taken from Rokan River and brought to the Instrumentation and Magnetism laboratory of Riau University to be dried in the sun first, after that the magnetic and non magnetic particles were separated using an Iro…
Environmental pollution by heavy metals becomes a serious problem with the increasing use of heavy metals in the industrial field. One of the widely used methods for removing heavy metals from liquid waste is adsorption using magnetic nanoparticles. Samples of beach sand that have been processed with an Iron Sand Separator (ISS) and separated by NdFeB (Neodymium Iron Boron), crushed by bal…
Utilization of soybean waste from tofu processing or tofu dregs as a basic material in fabrication of supercapacitor cell electrodes has been successfully carried out by varying types of activators using ZnCl2, NaOH and H3PO4. Activated carbon from tofu dregs was prepared through several steps such as drying, precarbonization, refining, chemical activation, pellet molding, carbonization and…
A thin film of Barium Titanate (BaTiO3) was doped by Barium Zirconat (BaZrO3) that produced the film in the form of BaZrxTi1-xO3 or BZT. This material has a high dielectrict constant. The BZT thin films were prepared with a composition variation x=0,7 and x=0,75 using sol-gel method. These samples were annealed at temperature of 600°C and 650°C for an hour. The thin films of BZT were cha…
Optics visualization learning media has been developed by several researchers before, still has shortcomings, including visualization of the formation of biconvex and biconcave thin lenses only, visualization which is not integrated with the material in one learning media, has not been equipped with practice questions and evaluations. This study aims to develop a valid optics visualization…
Abstract Zinc oxide (ZnO) is a metal oxide semiconductor that has a wide range of applications in many fields and can be easily produced in various microstructure. The fabrication of ZnO particle through green synthesis method was chosen as an alternative to replace chemical and physical methods, Green synthesis use natural ingredients derived from plant extracts. In this study, ZnO was sy…
ABSTRACT Synthesis of carbon electrode based on petai peel biomass has been succesfully made using a variation of concentration of KOH activator. The synthesis was started by drying the samples under the sun ray, and then drying them using an oven at temperature of 110° C then the samples entered the pre-carbonization process on 250° C. The samples were mashed then with ball milling and …