Jurnal Teknik: Media Pengembangan Ilmu dan Aplikasi Teknik

Antena Mikrostrip Circular Patch untuk Aplikasi Radar Altimeter pada Frekuensi C-Band Menggunakan Metode Parasitik

2022-05-27T22:20:34+08:00

Currently, human mobility and traffic between regions and between countries are increasing, this requires the world of aviation to grow as well. One of the developments in the world of aviation is radar altimeter technology as an aircraft navigation system that works in the frequency range of 4.2 - 4.4 GHz. In this research, the realization of a microstrip antenna with a circular patch on the C-band frequency has been carried out with the addition of parasitic elements and proximity coupled feeding to strengthen the gain and widen the bandwidth. The antenna is made using Rogers RT5870 material which has a relative permittivity of 2.33, a material thickness of 1.575 mm and a loss tangent of 0.0012. The measurement results show that the bandwidth of 300 MHz is 3.54% narrower than the simulation results, while the gain is 4.79% to 8.13 dBi and the radiation pattern is unidirectional.

Rancang Bangun Sistem Presensi Pegawai Menggunakan Pintu Otomatis Berbasis NFC (Near Field Communication)

2022-04-18T03:13:12+08:00

The attendance system is considered to be able to assist an agency in providing information about a person's attendance schedule. The attendance system can also be used as an effective tool for implementing discipline in an agency because, in this attendance system, we can see the difference between people's discipline through the timeliness of attendance that has been determined at each of these agencies. In designing this system the method used is NFC (Near Field Communication) where this system can be used to help record someone's attendance schedule. The hardware used is a door lock solenoid, and personal computer devices, while the software used is Wemos D1 Mini. For recording the database used is MySql. The results of presence system using NFC using the Key Door Lock method have a very high level of accuracy for reading an identity card. It can be seen from the data that has been collected that the accuracy of reading an identity card by an NFC reader shows that there is no error or error. The results of response time check test on the NFC reader reading can be proven by formula, where average time value of response time check test is 0.67 minutes.

Desain Band Pass Filter pada Frekuensi X-Band Menggunakan Metode Square Resonator untuk Aplikasi Radar Navigasi

2022-08-24T05:52:26+08:00

A bandpass filter is a component that can pass signals within a certain frequency range, bandpass filter will pass frequencies that are within the cut-off frequency range and reduce frequencies that are outside the cut-off frequency range. A bandpass filter can be used as a component in a navigation radar system in its application. The navigation radar works on X-band frequency, so we need a bandpass filter that can work at the X-band frequency, where in addition to passing the desired frequency and dampening unwanted frequencies, the bandpass filter can also prevent interference that can occur in the modulation process on the radar system. So in this study, a bandpass filter type filter that works at the X-band frequency with a center frequency of 9,1 GHz will be designed, where this filter will be created using the square resonator method, the advantages of this method in addition to its dimensions and simple circuit, the resonator with the shape square will have a suitable bandpass filter response. The final optimization filter that has been carried out produces parameters including the center frequency which is at 9,1 GHz, the bandwidth is 1.5 Ghz, S1.1 is 2,6 dB, and S2.1 is 14.4 dB.

Sistem Monitoring Kualitas Air pada Akuarium Budidaya Ternak Ikan Guppy Menggunakan Mikrokontroler Berbasis IoT

2022-09-19T12:47:13+08:00

Ornamental fish cultivation in Indonesia is growing rapidly, data from Ministry of Maritime Affairs and Fisheries (KKP) shows at least 4.720 species of fish, freshwater, and marine, 650 species are ornamental fish. KKP also noted that the production of ornamental fish increased, commodities increased significantly were Guppy (82.5%), Koki (61.7%), Corydoras (38.6%), Betta (16.4%) and Koi (8.9%). In order to produce quality fish, air quality such as pH, TDS, and temperature must be considered. Ornamental fish can survive conditions with pH value of 6.5-8.5, TDS value of 200 ppm and temperature below 28-32°C. The study designed an air quality monitoring system using a microcontroller based on IoT. The sensors used to measure water quality parameters are PH4502C, SEN0244, and DS18B20. The value read by the sensor will be collected and processed in microcontroller, microcontroller used in this system is Arduino Uno. The processed data will be sent to broker via NodeMCU using MQTT protocol. After data arrives at broker, data will be generated by two interfaces, interface is dashboard and augmented reality. The results of this system experiment present that data experiments it can be seen error rate of the pH sensor is 0.80, TDS 1.89, and temperature sensor 1.18.

Analisis Permasalahan Batas Darat Antara Indonesia dan Malaysia dalam Perspektif Aspek Teknis dan Teknologi Geospasial

2022-12-05T11:41:42+08:00

The implementation of survey boundary demarcation between Indonesia and Malaysia in Kalimantan has been carried out since 1975, and until now there are still 7 unresolved boundary issues. It’s called Outstanding Boundary Problems (OBP). In practice, issues arise due to differences in the datum and differences in the interpretation of the treaties of 1891, 1915, and 1928 between the Dutch Government and the British Government. This research aims to find an alternative model for the solution to the land boundary problem between Indonesia and Malaysia by conducting a critical, comprehensive study and analysis of the technical aspects of surveying and confirming the Indonesian and Malaysian state boundaries from the perspective of geospatial engineering and technology. This research combines an extensive literature study using maps, high-resolution satellite imagery, SRTM data, and field data from surveys and confirmation of the RI-Malaysia boundary to produce a comprehensive study from the perspective of technical aspects and geospatial technology. The results of the study resulted in an alternative model for solving land boundary problems between Indonesia-Malaysia, namely Indonesia received 3 claims and Malaysia obtained 3 claims from 7 existing problems and both parties divided the two for the Batu Aum area.

Perbandingan Nilai Kedalaman Relatif Sungai Brantas Kabupaten Jombang dengan Perhitungan Algoritma Van Hengel and Spitzer Citra Sentinel-2 dan Digital Elevation Model (DEM)

2023-01-05T09:57:55+08:00

Shallow water relative depth can be gained from the Digital Elevation Model (DEM). As science develops, methods are developed to gain the relative depth one is by processing the Sentinel-2 image using Van Hengel and Spitzer algorithm. The authors aim to compare the relative depth gained from the Sentinel-2 image using the Van Hengel and Spitzer algorithm to the relative depth gained from DEM. The data needed are orthorectified Sentinel-2 level 1C images downloaded from the Earth Explorer page and DEM downloaded from the Tanah Air page. Sentinel-2 image is then corrected atmospherically and radiometrically to get its radian value then processed using the Van Hengel and Spitzer algorithm. The sample points are spread at 25 meters intervals along the Jombang regency Brantas River. This study only compares the computational calculation therefore no field validation is carried out. Sentinel-2 Van Hengel and Spitzer provides an average relative depth of 16.35 m and DEM provides an average relative depth of 17.98 m with the determination coefficient (correlation value) of the two data is 6.52%. The low correlation is due to the high sediment content in the water column of Brantas River, causing the bias in the image.

Analisis Pengaruh Waktu Torefaksi Terhadap Kualitas Biobriket dari Cangkang Kelapa Sawit (Palm Oil Shell)

2023-01-05T10:01:23+08:00

Palm oil shells are solid waste from the palm oil processing industry. In 1 ton of palm oil produces 6.5% shell waste. Solid waste can be converted into fuel as a substitute for oil, namely bio-briquettes as an alternative fuel through a combustion process with less air. This study aims to determine the effect of time variations on the quality and yield of bio-briquettes produced using a combined pretreatment method of densification (with additional binder) and torrefaction at a temperature of 275 ^oC and time variations of 30, 45, 60, 75 and 90 minutes. Torrefaction is a new method in the briquetting process where this method takes place at low temperatures. The results showed that the longer the torrefaction time, in general, the value of water content, ash content, volatile matter content, fixed carbon value and burning time also increased. However, this is inversely proportional to the yield value of the resulting product, so the best quality is obtained in 75 minutes with a moisture content of 0.86%, ash content 2.38%, volatile matter content 18.23%, fixed carbon value 78.51 %, product yield is 36.3165% and calorific value is 5964 Kcal/kg.

Pemanfaatan Informasi Geospasial Dasar (IGD) untuk Analisis Penyimpangan Arah Kiblat Bangunan Masjid secara Masal

2023-01-10T09:23:56+08:00

Basic geospatial information that has been widely disseminated to the general public needs to be utilized optimally for various purposes related to spatial analysis. The city of Bandung is one of the cities with the largest muslim population and the largest mosque building in Indonesia. This study aims to analyze the mass deviation of the direction of mosque buildings, especially those that have been established in Cibeunying Kidul District, Bandung City. The method used is geovisual analysis by comparing the direction of the mosque's qibla which is calculated using the vincenty method to the direction of the mosque building obtained from the 1:1.000 scale RBI map, orthophoto and Mosque Information System (SIMAS). The calculation results show that only the Al Balad Mosque building leads to the city of Mecca. The average magnitude of the deviation from the qibla direction of the mosque building to the Kaaba is 15⁰ 1' 0,365 ". There are several factors that are identified visually and the correlation can affect the deviation value of the direction of the mosque building, including the direction of building density of 27.688% and the basic coefficient of mosque building of 14,001%.

Analisis Ekonomi Awal Proses Produksi Biobutanol dari Tandan Kosong Sawit dengan Proses Hidrolisis dan Fermentasi Secara Terpisah

2022-08-30T10:02:05+08:00

The limitation of petroleum reserves and environmental issues have led countries worldwide to shift towards producing and utilizing biofuels as an alternative solution to replace fossil fuels. One of the biofuels that can be used is biobutanol, which can be produced from residual waste containing lignocellulose. An empty fruit bunch (EFB) from oil palm is a residual waste used as raw material for biobutanol production. The method that can be used in biobutanol production is the Separated Hydrolysis and Fermentation (SHF) process, which allows the cellulose hydrolysis process to be pre-treated with acid at lower temperature but for longer time or at higher temperature for shorter time. The product from Clostridium acetobutylicum using hydrolysate from cellulose hydrolysis is higher than that from acid hydrolysis. The cellulase enzyme hydrolysis process can be separated from the fermentation process according to their optimum conditions. From the initial economic analysis calculation with production basis of 10,000 tons per year, total gross profit margin of IDR 39,459/kg was obtained, indicating that biobutanol production from EFB biomass is economically feasible and profitable. Further study is needed to conduct a techno-economic analysis of the biobutanol production process using EFB as raw material.

Kajian Penggunaan Profil Pultruded Fiber Reinforced Polymer untuk Jembatan Pejalan Kaki

2023-01-25T11:30:23+08:00

The interest in composite materials has increased significantly due to their high strength to weight ratio. Utilization of FRP as construction material is not yet popular in Indonesia as it’s generally used for strengthening structural elements. This study aims to provide a design overview of a hypothetical hollow square profile 150.130.10 on a single span bridge with 12, 16, 20 and 24 meters span length variations. The method refers to the AASHTO design criteria in the form of deflection, vibration, and component allowable stress. The results show that all design criteria on a 12 meters span are fulfilled. Due to insufficient bridge stiffness in 20 and 24 meters span, the vertical fundamental frequency is 4.33 Hz and 3.3 Hz respectively, thus the requirements (> 5Hz) are not fulfilled. In addition, the FRP profile weak axis critical compressive capacity (68.95 kN) cannot withstand the critical load at spans of 16, 20 and 24 meters (respectively: 97.91 kN; 144.39 kN; 185.36 kN). This study shows that dynamic responses and material characteristics are two factors that may determine pedestrian FRP bridges design.