Jurnal Ilmiah Giga

Simulasi Dan Analisis Perubahan Sudut Dan Kecepatan Sudut Rotor Terhadap Perubahan Konstanta Koefisien Redaman Torsi Pada Model Single Machine Infinite Bus

Heru Dibyo Laksono — 2024-07-24

The occupancy rate of the building has decreased due to the COVID-19 pandemic. Office buildings, hotels, apartments, and shopping centers experienced a decline in visitors. Meanwhile, some shops have stopped their business. The building management will continue to operate electrical equipment to support activities. The impact is that the load is unbalanced. This affects the load balance in the building. This condition will be detrimental and in the long term, will damage the transformer. The purpose of this study is to measure the level of electrical load balance in the Tang City Mall building. The measurement results on the existing 5-unit transformer show an unbalanced load between 0.63% to 4.76%. This measurement was carried out during rush hour conditions, namely at 17.30 WIB. Based on the calculation data, for a month, during a month you will experience a neutral current power loss of 2848kWh and a ground current power loss of 175 kWh. Instant measurements during mall opening and closing hours recorded a significant imbalance reaching 7.9% at trafo2. To avoid this, it is necessary to regroup, especially for single-phase loads. Meanwhile, building tenants' opening and closing hours must be simultaneous.

Kajian Pemanfaatan Kulit Ari Kedelai dan Kulit Durian Sebagai Bahan Pembuatan Biobriket

Putri Putri Anggraini — 2024-07-24

Soybean is a commodity that has an important role in industrial development, especially in the tofu, tempeh, and soy sauce industries. Waste from soybean hulls is still not widely utilized, only used for feed and beverages for cattle. Similarly, durian peels are only utilized for the fruit's meat and seeds, and the peels are thrown away. Product innovation based on durian peels and soybean hulls needs to be implemented to optimize the utilization of these two wastes to increase economic value. The high cellulose content of both wastes can be utilized as raw material for biobriquettes as an alternative to fossil fuelsusing a carbonization process in a chamber furnace at a temperature of 200-250 °C. The higher the ratio of soybean hulls and durian peels produces a high heating value followed by a decrease in moisture content and ash content. The results showed that the biobriquettes from soybean hulls and durian peels have complied with SNI 01-6235-2000. The best condition is obtained by the composition ratio of soybean hulls and durian peels 25:75 (%w/w) with 4 grams of adhesive which produces a calorific value of 5444 cal/g, a moisture content of 4.9%, and an ash content of 6.89%.

Perancangan Jemuran Otomatis Berbasis IoT Menggunakan ESP32 Dan API

Dewi Laksmiati — 2024-07-24

Drying clothes is a common daily activity performed by people around us. Typically, this task is carried out outdoors with the expectation that sunlight will quickly dry the clothes. However, in today's modern era, where the demands of work and other activities are very high, the task of drying clothes is often forgotten due to being preoccupied with other tasks and not having time to retrieve the clothes when the weather turns bad. This device utilizes the ESP32 microcontroller as its controller, with inputs from a rain sensor, LDR (Light Dependent Resistor) sensor, and the Open Weather API (Application Programming Interface) The rain sensor serves as the primary input that activates upon contact with rainwater, the LDR sensor functions as an input when night falls, and the Open Weather API aims for early prevention based on current weather forecasts at the device's location.

Pengukuran Kinerja Supply Chain Produk Pelumas dengan Pendekatan Supply Chain Operation Reference (SCOR) di Sebuah Perusahaan Multinasional

Resista Vikaliana — 2024-07-24

PT XYZ is a multinational company from France that focuses on lubricant products. Problems at PT XYZ include overstocked items and damaged or defective product packaging during production, storage, and distribution. To compete in the Indonesian lubricant business market, it is necessary to analyze the supply chain performance using the SCOR model approach. The goal is to design supply chain performance indicators and propose improvements for low-performing areas. There are 12 existing KPIs and 8 additional KPIs from literature studies that have been adapted to the company's needs. KPI properties are compiled, and data is processed to determine the weights for each performance level with the help of Expert Choice. Data processing is carried out by calculating secondary data obtained for each KPI, except for KPI-8, KPI-13, KPI-14, and KPI-19, which do not have data requirements. Normalization is carried out for each KPI, and the total supply chain performance measurement for PT XYZ is 56.78, with an additional contribution value of 13.3. It can be concluded that around 70% of the maximum performance has been achieved, which falls into the "Good" category.

Evaluasi dosis CT Simulator pada Radioterapi Head and Neck dan Pelvis

Aris Nurkamal — 2024-06-30

The CT Simulator is an imaging modality used in radiotherapy for target delineation and dose calculation in therapy planning. AAPM TG 204 provides conversion factors based on patient body size, specifically for CTDI_vol correction, as it does not directly measure the patient's radiation dose. Despite its advantages, there is still limited attention given to dose-saving strategies in CT simulation. This study aims to evaluate the percentage of additional radiation dose by utilizing Size-Specific Dose Estimate (SSDE) per AAPM TG 204. Ten patients each undergoing head and neck (CT HNC) and pelvis CT scans were assessed. The CTDI_vol values displayed on the console were verified using a dosimeter chamber on a CTDI body phantom. The results show an average verification value of 2.78% for CT HNC and 2.02% for CT Pelvis, within the acceptable threshold set by ACR and Bapeten (≤ 20%). The average SSDE values recorded were 83.02 mGy for CT HNC and 39.08 mGy for CT Pelvis. Additionally, the average percentage of dose contribution to the prescribed therapy dose was 1.6% for CT HNC and 0.43% for CT Pelvis, below the ICRU Report 50 recommendations. The CT HNC dose was higher due to using a larger tube current (mA), which results in higher X-ray intensity, and a slower rotation time, leading to longer radiation exposure. However, the CT Pelvic dose exceeded the I-DRL reference of 17 mGy, with an average of 27.31 mGy. Optimisation of scanning parameters remains essential, and, where feasible, substituting non-ionizing imaging modalities such as MRI, which offers several benefits, can be advantageous.