Penelitian ini bertujuan untuk memperoleh informai mengenai tegangan lewat denyar dan arus bocor yang diakibatkan oleh iklim serta polusi pembakaran batu bara yang menyebabkan adanya pelapisan polutan dipermukaan isolator. Metoda pemberian lapisan polutan pada permukaan isolator dengan cara menyemprotkan polutan pada permukaan isolator dengan beberapa kondisi pengujian. Metode pegujianya dengan cara diberikan tegangan tinggi sampai terjadi tegangan lewat denyar. Data hasil pengukuran memperlihatkan bahwa, terdapat hubungan yang signifikan antara polutan yang dilapisi pada permukaan isolator dan ESDD yang melekat pada permukaan isolator. Hasil penelitian dapat disimpulkan bahwa dari beberapa kondisi pengujian, maka pada kondisi kering takberpolutan nilai tegangan lewat denyar paling tinggi dan pada kondisi basah perpolutan nilai tegangan lewat denyar paling rendah
This study aims to develop digital comics for learning magnetism in learning Science in Elementary Schools. This type of research is development research, which refers to the Four-D. The location of this research is at Kota Tengah 80 Public Elementary School, Bulangu Timur 1 Public Elementary School, and Telaga Biru 1 Public Elementary School. The results of the study show that digital comic magnets developed for science learning in elementary schools: (1) are categorized as valid and feasible; (2) Practically used, this is indicated by the very good response from students with a percentage of 90% in the limited trial class and 93.75% in the extended trial class. The implementation of learning in the limited trial class obtained an average percentage of 90.91%, while in the extended trial class it was 96.15%; (3) Effectiveness, indicated by good student activity with a percentage of 82% in both limited trial classes and extended trial classes, as well as student learning outcomes that are in very good criteria. Based on this, the digital comics magnet that has been developed is stated to be valid, practical and effective, so that it can be used in the science learning process in class V of elementary school
The photovoltaic (PV) panel makes it possible for everyone to produce electricity in their own house. However, the panel is quite a costly investment and requires much consideration to maximize its potential. The roof has variables that would impact electricity generation. The roof of housing in Indonesia was built generally in a complex shape, a combination of gable and hip roofs. This research is conducted to break down factors affecting PV productivity in regard to the roof’s aspects. A computer simulation using Ladybug plugin in Rhinoceros software has been done to achieve the target. Initially, the performance of PV panels on the gable, and hip roof, is analyzed respectively. It is found that the roof’s slope, and orientation, contribute more to the amount of electricity produced than the shape itself. These factors were used to assess the PV potential in several housing models employing simple and complex roof (more than 2 surfaces) construction in the city of Gorontalo. Eventually, a comparison between the estimation of real PV production on housing, and the estimation provided by the simulation is conducted to verify the assessment method. The difference is about 4%, as proof the simulation result is reliable.
Shunt Active Power Filter (APF) is one of most preferred filters for the mitigation of harmonics in power systems. The controller part of shunt APF plays an important role to generate a reference current which compensate/cancel the distorted currents. The APF injects current equal but opposite to the harmonic components, in turn the fundamental components only flows in the point of common coupling (PCC). In this studying, for four controls algorithm are proposed to control the shunt active filter. Instantaneous Active-Reactive Power Theory (PQ), an adaptive phase locked loop (PLL), Instantaneous active and reactive current method (DQ) and Synchronous detection method (SD) are designed to generate the reference current of APF for mitigation of harmonics. The performance of the four methods are analyzed and compared under different operating conditions. The load is assumed to have high nonlinear characteristics. Digital simulations are carried out to demonstrate the performance of the proposed algorithms using matlab/Simulink software package.
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