10 research outputs found
The wireless energy transfer (WET) using ultra high frequency (UHF) for human body implant recharging
No full textThe wireless energy transfer (wet) is widely used in many fields. In particularly for medical, this technique can be implemented to an electronic human body implant recharging. The possible size and shape of the receiver antenna in the experiment before still become a problem. Using Yagi-Uda model antenna for the transmitter unit in ultra-high frequency (UHF) band, this paper refers to design a receiver antenna for implemented as a human implant recharging. The receiver antenna has successfully designed in minimal with its size and shape of the designed antenna is about 1.44 cm3
The Wireless Energy Transfer recharging system based on the ultra-high frequency by using Yagi-Uda directional antenna
No full textIn the near future, the Wireless Energy Transfer (WET) will be widely used, especially for electronics recharging in the human organ implantations. WET has been researched intensively by some researchers, but the low efficient energy transfer is still a problem. In order to figure out the efficiency of the energy transfer, the experiment had been conducted in Laboratory of Sensor and Telecontrol Systems. The complexities of the measurement system setup and assessment of the sufficient energy both transmitter and receiver will also be discussed. The experiment results deliver the new design of the WET, empiric data of the energy transfer, and the sufficient antenna model as well. In this research, The UHF transmitter generated radio frequency with output energy of 39.00-watt energy source. The range of various frequencies in this paper is 400 MHz to 489 MHz and the SWR is 1.2. The transmitter unit and the antenna were connected with the 50 ohm-coaxial cable. In order to transfer the energy, the transmitter system consisting Yagi-Uda model antenna was applied. The results show that the efficiency maximum of the measured energy transfer is 0.36%. In our investigations, the efficiency of the result also depends on the polarity of the Yagi-Uda Antenna used in the experiment. According to the results, the angle that the maximum energy transferred is 60°, on the contrary, the angle of 150° gives the lowest efficiency results. We found that the distance between the transmitter and receiver antenna contribute significantly to the amount of energy transferred from the system. In this case, the energy can be calculated from the current and voltage measurement. The energy transfer versus distance relationship shows that a specific trend was obtained. This specific trend seems are affected by the antenna characters used in the experiment. Based on the experiment results, the wireless energy transfer could be done by utilizing UHF radio wave. Even though the efficiencies were still relatively low, but it can be used for some specific purposes in the example, in the electronic human organ implant recharging and applicable for the general electronic devices in the special areas. This experiment data are very useful for the scientists, practicing who work in the WET research field
Development of the Groundwater Level Changes Detector for Earthquake Prediction at Yogyakarta Region – Indonesia
No full textGroundwater level (GWL) change is one of the earthquake precursors that used for earthquake prediction. The groundwater level change system detector for earthquake prediction at Yogyakarta region - Indonesia contains the GWL detector, signal conditioner, controller, data storage and electrical power supply. The GWL changes detectors which are developed in this report are expected to be used for the earthquake precursors prediction in Yogyakarta region - Indonesia. The detector system shows the detection of groundwater level changes with a sensitivity of 0.01 centimeters. The data from the detector is stored on the storage media, then the data which are collected in weekly will be confirmed with the earthquake data from the BMKG (Indonesian Meteorology, Climatology, and Geophysics Agency). On June 11, 12, 15, and 21 the GWL have a change of 4 centimeters to 19 centimeters respectively, the earthquake occurs within the next 2 days. It shows that the system could be used as an earthquake precursors monitoring system based on GWL changes. This report in order to give the valuable information of the development system that can be used for earthquake prediction, even though it needs further study and development of the instrumentation system from other earthquake precursors anomaly
PERANCANGAN SISTEM KOMUNIKASI DARURAT BERBASIS FREKUENSI RADIO UNTUK TANGGAP DARURAT INDUSTRI DI DAERAH ISTIMEWA YOGYAKARTA
No full textGeologically, the Special Region of Yogyakarta is one of the regions in
Indonesia is prone to natural disasters. Emergency communications systems needed
to support the emergency response implementation. Based on the results of research
and simulation, the emergency communication system based on radio-frequency can
be used to support the audio communication and the digital data communication
when industrial emergencies. The emergency communications system required the
transceiver equipment / the handy transceiver, antenna, cable (feeder), and the
repeater systems were adequate and covered all areas in Yogyakarta region.
Based on the preliminary research was concluded that the location and
specifications the Balerante repeaters can be used as reference for the designed of
the repeater. From the results of the signal quality testing was done at 10 locations
with distance and elevation were more varied. Power transmitted of the Balerante
repeater which has 50 watts can be received in various places with a readability
average at level 4 (readable with practically no difficulty) and the signal strength on
average at level 6 (good).
From the results the text data transmitted from the distance of 100 m to 4000
m (without repeater) was obtained data transfer success reaching an average value
of 97.56%. This indicates that the successful delivery of the text data, where the text
data was accepted successfully on the recipient's computer. Error of 2 44 % are
caused by noise when the process starts data communication. From the results the
image data transmitted from the distance of 500 m to 4000 m without a repeater, it
appears that the image data has been sent, but there was a decrease in image quality
from 93.85% to 55.33% decline in the quality of the image caused by the frequency
distortion and smaller gain when sending the image data. Its very urgent need to
establish a specific standard operating procedure of radio frequency-based
emergency communications that regulate the activities during the pre-emergency,
emergency and post-emergency
The wireless energy transfer (WET) using ultra high frequency (UHF) for human body implant recharging
No full textThe wireless energy transfer (wet) is widely used in many fields. In particularly for medical, this technique can be implemented to an electronic human body implant recharging. The possible size and shape of the receiver antenna in the experiment before still become a problem. Using Yagi-Uda model antenna for the transmitter unit in ultra-high frequency (UHF) band, this paper refers to design a receiver antenna for implemented as a human implant recharging. The receiver antenna has successfully designed in minimal with its size and shape of the designed antenna is about 1.44 cm3
Analisis Keselamatan pada Instalasi Sistem Pembuatan dan Pengujian Solid Propelant Double Base dari Minyak Jarak - Jurusan Teknik Fisika UGM
Full text linkProgram teknologi pengembangan roket propelan telah dimulai di Laboratorium Sensor dan Sistem Telekontrol Jurusan Teknik Fisika UGM untuk mendukung program-program kedirgantaraan, dengan dikembangkannya rancang bangun sistem pembuatan dan pengujian solid propelant double base dari minyak jarak. Untuk mencegah terjadinya hal-hal yang tidak diinginkan, khususnya pada saat uji statik dan uji terbang, maka perlu dilakukan peninjauan terhadap aspek keselamatan pada saat pembuatan dan pengujian roket yang menggunakan solid propelant double base dari minyak jarak. Perlu dilakukan penerapan sistem keselamatan sejak tahap produksi, penyimpanan hingga uji propelan. Pada aspek analisis keselamatan (safety), hazard dominan teridentifikasi pada proses pencetakan yang bekerja pada suhu 30oC hingga 120 oC dan penyimpanan propelan, serta proses pengujian statik terkait bangunan uji dan alat uji. Pada aspek kesehatan (health), hazard teridentifikasi pada proses uji statik dimana dimungkinkan terjadinya ledakan yang menyebabkan kerusakan pendengaran, dan cedera. Pada aspek lingkungan (environtment) tidak ditemukan hazard yang dominan namun perlu diperhatikan faktor kebisingan dan kerusakan lingkungan jika kegagalan uji statik. Pertimbangan keselamatan uji modifikasi dilakukan pada tinggi bangunan ruang uji. Dengan pertimbangan tinggi semburan api propelan padat, tinggi yang semula dirancang 2,20 meter dirubah menjadi 4 meter. Pertimbangan keselamatan uji coba menuntut kekuatan dinding bangunan uji. Dinding bangunan uji dibuat rangkap dua. Dinding sisi dalam dilapis dengan anyaman kawat logam untuk meredam dampak destruktif jika terjadi ledakan akibat kegagalan uji statik
Deterministic system for earthquake early warning system based on radon gas concentration anomaly at Yogyakarta Region-Indonesia
No full textPerformance Test of VHF-HF-based Emergency Data Communication System between the Sardjito Hospital and District Hospital in the Isolated and Disaster-prone Areas
No full textThe topography of Gunungkidul area in the Province of Yogyakarta, Indonesia, consisting of hills and limestone mountains. It becomes the potential factor of landslide occurrences. Especially in the rainy season, the soils in the hills become softer and it increases the possibility to cause a landslide. This condition has became the concern of many people, especially the residents who live in the landslide-prone area. This topography is also one of the factors for health centre in a certain area becomes isolated due to the inability of telecommunication signal services from the provider to reach that area, which is called a blank area. That situation makes an inability to contact the nearest district hospital to ask for support in an emergency case. This research focuses on the performance test of the emergency data communication system by using several types of data. The system uses Very High Frequency (VHF) 144 MHz and High Frequency (HF) 7.08 MHz as the data carrier and a software to interpret the text and image to be modulated onto the data carrier. That system is called a virtual hospital, means that even though the health center is located in a blank area, but specialists from the Sardjito Hospital can still deliver advices to support the health center in maintaining the medical service quality by using the VHF-HF-based emergency data communication system. Based on the results of the system's performance test between the Wonosari Gunungkidul District Hospital and the Sardjito Hospital with the distance of 40 km, the receiving quality of the data transmission for text and image are 95% and 55.33%, respectively
Performance Test of VHF-HF-based Emergency Data Communication System between the Sardjito Hospital and District Hospital in the Isolated and Disaster-prone Areas
No full textThe topography of Gunungkidul area in the Province of Yogyakarta, Indonesia, consisting of hills and limestone mountains. It becomes the potential factor of landslide occurrences. Especially in the rainy season, the soils in the hills become softer and it increases the possibility to cause a landslide. This condition has became the concern of many people, especially the residents who live in the landslide-prone area. This topography is also one of the factors for health centre in a certain area becomes isolated due to the inability of telecommunication signal services from the provider to reach that area, which is called a blank area. That situation makes an inability to contact the nearest district hospital to ask for support in an emergency case. This research focuses on the performance test of the emergency data communication system by using several types of data. The system uses Very High Frequency (VHF) 144 MHz and High Frequency (HF) 7.08 MHz as the data carrier and a software to interpret the text and image to be modulated onto the data carrier. That system is called a virtual hospital, means that even though the health center is located in a blank area, but specialists from the Sardjito Hospital can still deliver advices to support the health center in maintaining the medical service quality by using the VHF-HF-based emergency data communication system. Based on the results of the system's performance test between the Wonosari Gunungkidul District Hospital and the Sardjito Hospital with the distance of 40 km, the receiving quality of the data transmission for text and image are 95% and 55.33%, respectively
Earthquake magnitude prediction based on radon cloud data near Grindulu fault, Indonesia using the statistical method
Full text linkEarthquake prediction is one of the most challenging and vital tasks that demands new methodologies for improving the accuracy of predictions. The research aims to present how radon gas concentration fluctuations are associated with the prediction of earthquakes in the Eurasian-Indo-Australian Plates. The paper discusses a statistical method of forecasting earthquake magnitudes greater than M4.5 from real-time radon gas monitoring close to the Grindulu Fault, Pacitan, East Java, Indonesia. This developed model has had the least errors in the form of mean absolute error (MAE), 0.30; mean absolute percentage error (MAPE), 0.06; root mean square error (RMSE), 0.55; mean squared error (MSE), 0.30; symmetric mean absolute percentage error (SMAPE), 0.06; complex normalized mean absolute percentage error (cnMAPE), 0.97; error absolute average (EAA), 0.30; and error relative average (ERA), -0.11, showing great accuracy and uniformity in prediction. These observations support the model’s efficiency that may be adopted in earthquake early warning systems for better disaster preparedness. Predictive errors are reduced, and there is support for improved disaster management strategy, public safety education, and effective emergency response personnel training. This study can be used as a foothold for further advances in earthquake prediction methodologies and refinement of early warning systems
