Physics
https://repository.unri.ac.id/handle/123456789/92
2024-03-28T16:52:12ZPENGARUH JOULE HEATING PADA BAHAN FEROMAGNETIK VITROVAC 6025Z TERHADAP EFEK MAGNETO IMPEDANCE
https://repository.unri.ac.id/handle/123456789/11323
PENGARUH JOULE HEATING PADA BAHAN FEROMAGNETIK VITROVAC 6025Z TERHADAP EFEK MAGNETO IMPEDANCE
Yani, Conita Fitri
"Magneto Impedance, as a promising alternative in detecting magnetic fields, has
undergone rapid development in altering the electrical impedance experienced by
conductors when exposed to magnetic fields. This research involves the design and
implementation of a magneto impedance sensor system utilizing the Joule heating
method. The sensitivity of this magneto impedance sensor system reaches
approximately picoTesla, generating magnetic fields of around 100 pT. The success of
the sensor system's design is evaluated based on its response to magnetic fields
approaching the Earth's magnetic field scale, approximately 50 μT. This magneto
impedance sensor is crafted using a core made of Vitrovac 6025Z, with a thickness of
0.04 mm and a width of 0.34 mm. The sensor's core experiences 6 varying Joule heating
currents, ranging from 0 mA to 540 mA. The sensor system is subjected to testing at
frequencies 100 kHz for each current variation. The magneto impedance sensor system
generates output in the form of impedance and magnetic fields. The output values will
be used to determine the magneto impedance ratio.
2023-11-01T00:00:00ZANALISIS KINERJA PEMBANGKIT LISTRIK TENAGA AIR MENGGUNAKAN TURBIN VORTEX
https://repository.unri.ac.id/handle/123456789/11322
ANALISIS KINERJA PEMBANGKIT LISTRIK TENAGA AIR MENGGUNAKAN TURBIN VORTEX
Marwin, Azwir
Indonesia has 42,210 rivers whose utilization has not been optimized 12,894 MW of
water energy potential in 89 power generatim locations, and there are about 2,275
villages out of 74,961 villages in Indonesia that do not have electricity. There are still
many areas that do not have electricity. The presence of vortex turbines with small to
large scale hydropower can be utilized in remote areas. So the vortex turbine is one of
the turbines that meets these criteria, by utilizing the kinetic force of the water vortex
to convert it into shaft power. Given this problem, this research is carried out with the
aim of getting the better power from a vortex turbine with 5 variations of water
discharge and efficiency in each variation. The method used is an experiment using a
vortex type water turbine, by investigating the effect of variations in water discharge
passing through the vortex turbine prototype. The results show that the highest
maximum power is 2.2533 Watts, and the highest vortex turbine rotation is 192 rpm,
The highest water discharge is 6.12 cm3/s, and the highest efficiency is 23.4%.
Keyword: Vortex turbine, potential, microhydro
2023-11-01T00:00:00ZPENGARUH KONSENTRASI FORMALIN PADA TAHU TERHADAP RESPON TEGANGAN KELUARAN PADA SENSOR GAS SEMIKONDUKTOR BERBASIS ELECTRONIC NOSE
https://repository.unri.ac.id/handle/123456789/11284
PENGARUH KONSENTRASI FORMALIN PADA TAHU TERHADAP RESPON TEGANGAN KELUARAN PADA SENSOR GAS SEMIKONDUKTOR BERBASIS ELECTRONIC NOSE
Falencia, Ega Hadisty
Formaldehyde is widely used as a food additive to preserve food, one of which is tofu,
because tofu has a high-water content which makes tofu rot quickly and taste sour. The
use of formaldehyde as a preservative is strictly prohibited in accordance with the
Republic of Indonesia Minister of Health Regulation No. 033 of 2012 because
formaldehyde is dangerous for body health. One innovative technology that can be used
to detect the presence of formaldehyde in tofu in a simple and practical way is system
design Electronic Nose (E-Nose). The objective of in this research is tofu soaked with
varying formaldehyde concentrations of 0%, 1%, 2%, 3%, 4% and 5% will be detected
using a system E-Nose which is designed to use 3 gas sensors made from
semiconductors, including the TGS2600, TGS2602, and TGS2611 gas sensors. The
gas sensors used will produce a response in the form of an output voltage. From the
voltage response produced by each sensor, if the greater the formaldehyde
concentration is detected, the resulting voltage response will also increase.
2023-10-01T00:00:00ZPEMBUATAN KARBON BERPORI BERBASIS DAUN SURIAN MERAH (TOONA SINENSIS) UNTUK KOMPONEN ELEKTRODA SEL SUPERKAPASITOR
https://repository.unri.ac.id/handle/123456789/11281
PEMBUATAN KARBON BERPORI BERBASIS DAUN SURIAN MERAH (TOONA SINENSIS) UNTUK KOMPONEN ELEKTRODA SEL SUPERKAPASITOR
Asmarwati, Asmarwati
Porous carbon based on red surian (Toona sinensis) leaf biomass waste was chosen as
the basic material for making active carbon. Porous carbon was synthesized using the
chemical activator ZnCl2 as an activating agent, by varying the molarity at 0.3, 0.5
and 0.7 to obtain optimal conditions for activated carbon. Carbon electrode sample
preparation starts from the drying stage, pre-carbonization at 250 °C, grinding with
mortar and ball milling, sieving using a 60 μm sieve, chemical activation of ZnCl2,
printing and integrated pyrolysis in one direct stage, namely carbonization and
physical activation to an optimum temperature of 850 °C in a N2 and CO2 gas
environment. Next, the effects of different concentrations of ZnCl2 activator were
tested, investigated, and the physical properties were compared. The results of the
characterization of the physical properties of the red surian leaf activated carbon
electrode were obtained by calculating the percentage shrinkage of the density value.
The difference in concentration of the ZnCl2 activating agent was able to reduce the
percentage density of carbon coins by 20.43%, 28.28%, and 34.31% for SM-03, SM-
05, and SM-07. Based on these results, the effect of adding the chemical activator
ZnCl2 to the carbon of red surian leaves can increase the evaporation of impurity
elements other than carbon which is indicated by an increase in the shrinkage value.
2023-10-01T00:00:00Z