Fisika

This research has studied the value of moisture content, calorific value, and the rate of burning of corncob skin briquettes and kapok kapok (Ceiba pentranda). The briquettes were produced in 5 steps: First, the main material for cobs and kapok randu (Ceiba Pentranda) skin is dried so that the weight is reduced by 20%. Second, the carbonization of the main materials with a temperature of 400 ̊C for 60 minutes with a furnace and sieved. Third, compressed briquettes with corncob and kapok randu (Ceiba Pentranda) skin composition in the following ratios of A (100%: 0%), B (75%: 25%), C (50%: 50%), D (25%: 75 %), E (0%: 100%) with 10% w/w tapioca starch as binder. Fourth, dried the briquette sample and roasted at a temperature of 100 ̊C for 60 minutes. Fifth, the samples were then characterized by bomb calorimeter. The results show that the highest moisture content value was in sample E 3,33%, the highest calorific value was in sample E which was 6195.05 Cal/grams, and the highest burni...

Bio-briquettes of organic waste can be used as alternative energy to solve the waste problem. This study aimed to determine the quality of bio-briquettes made of LDPE, coconut husk, and coconut shell with tapioca adhesive. The coconut husk and shell were carbonized at 300 °C for 60 minutes. Charcoal that has been ground and sieved with 40 mesh is mixed with tapioca flour adhesive, and pieces of LDPE are added. Then, the sample is pressed with a cylindrical mold with a matrix strength of 5 tons. Bio-briquettes were dried in an oven at 80 °C for 12 hours. The quality of the briquette was evaluated through proximate analysis, including the calorific value, moisture content, ash content, volatile matter content, and fixed carbon content. The calorific value of all samples complied with the regulation of the Ministry of Energy and Mineral Resources (ESDM) No. 047 of 2006, which is above 4400 cal/g. The maximum moisture content is 15%, which fulfills SNI 06–3730-1995 standards, and the ES...

The formation of ZnO/Ag morphology in the form of ganglia structures that are overgrown with grains in previous studies has been shown to degrade the presence of E. coli bacteria. In this research, the variations of annealing temperature were studied, namely 250 ℃, 300 ℃, 350 ℃, and 400 ep when the 4% ZnO/Ag deposition had an effect on crystallinity and morphology. The crystallinity of ZnO/Ag was obtained by using the X-Ray Diffraction (XRD) test and the surface morphology of the ZnO/Ag layer using the Scanning Electron Microscope (SEM) test. The results of the research with the XRD test showed that the crystal structure of ZnO/Ag 4% was hexagonal wurtzite at annealing temperature of 250 ℃ and 300 ℃, while the amorphous structure was obtained in ZnO/Ag with annealing temperature of 350 ℃ and 400 ℃. The largest average crystallite size was owned by ZnO/Ag at annealing temperature of 300 ℃ which was 83.408 µm. The morphology obtained from a thin layer of ZnO/Ag 4% with annealing tempe...

This research has successfully deposited ZnO: Ag on aluminum foil substrates with variations in deposition temperature. The purpose of this study was to obtain the surface morphology of ZnO:Ag on aluminum foil substrates with variations in deposition temperature and obtain optimization of the photocatalytic activity of ZnO: Ag in degrading Methylene Blue dyes. ZnO:Ag deposition on the aluminum foil substrate was carried out by the sol-gel method and spray coating deposition technique. Surface morphology characterization and photocatalytic activity with SEM and with UV-Vis. The surface morphology results obtained from ZnO:Ag on aluminum foil substrate with deposition temperatures of 250 ℃, 300 ℃, 350 ℃, and 400 ℃ are the forms of ganglia with indications as ZnO and Ag grains attached to ZnO. Obtained surface area and roughness level ZnO:Ag decreases with an increase in temperature from 250 ℃ - 300 ℃, and surface area and roughness increases at 350 ℃ -400 ℃. The highest level of rough...

Double layer (DL) ZnO/ZnO:Ag has been synthesized with variations in molarity of 0.1, 0.3, 0.5,  and 0.7 M and its application as a degrading agent for methanil yellow dye. This study aims to determine the effect of the molarity of the DL ZnO/ZnO:Ag on crystallinity and photocatalytic activity for methanil yellow degradation. DL ZnO/ZnO:Ag was synthesized using sol-gel technique and deposited with spray coating technique. The results of DL ZnO/ZnO:Ag were characterized by XRD to determine the crystallinity and particle size. The photocatalytic activity was carried out by immersing the DL ZnO/ZnO:Ag layer in 10 ppm methanil yellow solution and irradiating it with UV light for 4 hours and then tested using UV-Vis spectroscopy to get the percentage of methanil yellow degradation. The results showed that the crystallinity of the DL ZnO/ZnO:Ag for all molarity variations had a hexagonal wurtzite structure. Grains size increase as molarity increases from 0.1 to 0.5 M. However, if the conc...

The Standard Model is a model of particle physics in which one Higgs particle has been confirmed with a mass of 126 GeV. In 2016 some discoveries made it possible to have other scalar particles similar to the Higgs. The modified left-right symmetric model extends the standard model with an expanded scalar sector. There are ϕ_L and Δ_L left sector scalar particles, ϕ_L and Δ_L right sector scalar particles and two singlet η and ξ scalar particles. Therefore, this research objective is to analyze of the possibility of a Higgs interaction with other scalar particles. The method of this research is using a Feynman diagram to describe the interaction terms at the Higgs Potential. The interaction probability is sought using the Feynman rule for Toy Theory. The decay rate uses the Golden Rule. When the universe's temperature reaches the mass of η, the scalar becomes non-relativistic and decays into ϕ_L and ϕ_R. The scalar ξ is scattered into ϕ_L through the η scalar propagator and into...

The ellips space E has been constructed as cartesian product R + × R + × [ π 2 , π 2 ]. Its elements, (a, b, θ), is called as an ellipse with eccentricity is = 1 − b 2 /a 2 if b < a and is = 1 − a 2 /b 2 if a > b. The points (a, b, π/2) is equal to (b, a, 0). The action of subgrup SOoz(3, 1) of Lorentz group SOo(3, 1), containing Lorentz transformations on x−y plane and rotations about z axes, on E is defined as Lorentz transformation or rotation transformation of points in an ellipse. The action is effective since there are no rigid points in E. The action is also not free and transitive. These properties means that Lorentz transformations change any ellips into another ellips. Although mathematically we can move from an ellipse to another one with the bigger eccentrity but it is imposible physically. This is occured because we do not include the speed parameter into the definition of an ellipse in E.

Dalam tulisan ini kami mengkaji tentang fenomena yang terjadi yang berkaiatan dengan konsep dalam fisika, yaitu fenomena dua massa jenis air dilautan yang tidak menyatu, keterkaitan antara fenomena tersebut dengan Al Quran dijelaskan dalam surah Ar Rahman ayat 19-20.  Fenomena tersebut Dalam Ilmu sains terjadi karena ada perbedaan Massa Jenis yang terkandung dalam air. Metode yang digunakan dalam pembuatan jurnal ini adalah dengan metode Literatur review  dengan mencari data dari berbagai refesi yang diambil dari cara tinjauan teori dan tinjauan Pustaka hasil penelitian dan hasil pemikira yang sudah dihasilkan oleh para peneliti dan praktisi. Hasilnya dapat memberikan wawasan yang baru mengenai katerkaiatan massa jenis air dengan  surah Ar Rahman ayat 19-20, dalam Qur’an Surah Ar Rahman ayat 19-20 terdapat pesan bahwa ada lautan yang tidak menyatu namun ada batas dalam ilmu fisika tersebut berkaitan dengan perbedaan massa jenis air berbeda yang dipengaruhi oleh faktor salinitas, tekanan, dan suhu.
Kata Kunci : Fenomena, Lautan, Massa Jenis, Quran Surah Ar Rahman Ayat 19-20.