This paper presents a control called Maximum Power Point Tracking (MPPT) for photovoltaic (PV) system in a solar car. The main purpose of this system is to extracts PV power maximally while keeping small losses using a simple design of converter. Working principle of MPPT based fuzzy logic controller (MPPT-FLC) is to get desirable values of reference current and voltage. MPPT-FLC compares them with the values of the PV's actual current and voltage to control duty cycle value. Then the duty cycle value is used to adjust the angle of ignition switch (MOSFET gate) on the Boost converter. The proposed method was shown through simulation performed using PSIM and MATLAB software. Simulation results show that the system is able to improve the PV power extraction efficiency significantly by approximately 98% of PV's power.
This paper is aimed to describe the structural complexity of the traffic light control system. The structural complexity represents an interrelationship indicator between the various elements functions. The traffic light control system has several additional features that are synchronized to the railway doorstop, and the time interval for the green signals is expanded. For determining the method of its structural complexity, the Petri net model is used. Three kinds of traffic lights models are explored, namely standard, Norwegian, and the Norwegian improvement. The study results indicate that the Norwegian traffic lights have the most complex structure when regular implementation. The runner up is the Norwegian improvement. The most ideal is the standard traffic lights. Norwegian improvement is the most ideal when integrated with the railway doorstop and implemented extra green signals time interval. The Norwegian traffic light is the second. The standard traffic lights structural complexity fluctuates. It means that the Norwegian traffic light and its improvement are suitably used. Adding several features improve the structural complexity approaching the ideal system while extra controllers accompany each element. HIGHLIGHTS The Petri net model can represent the structural complexity of a system The method that can measure the structural complexity becomes ideal for actual implementation The Norwegian traffic lights structural complexities and improvements are ideal for the systems synchronized to the railway and appropriate for systems using the extra green signal time intervals or other additional features GRAPHICAL ABSTRACT
Mathematical modeling assumes that the vehicle’s volume has a uniform pattern. Due to traffic lightssettings, the number of vehicles queue grows linearly. The reality, the stochastic arrivals of the vehiclescould be (1) in the randomized arrivals, (2) in the form of groups/ platoon, or (3) in the mixed arrivals. Itis observed that the arrival of the vehicles in the queue tends to have a normal pattern. The objective ofthis research is to study the implications of the arrival categories to the travel delay. For simulation, ituses the numerical method referring to the real state. The result indicates that the calculations of thetravel delay become precise for all vehicles.
This study aimed to determine the effect of oil palm fronds addition as a mixture to the mechanical properties of bricks in terms of porosity testing, and compressive strength, and to determine the proper percentage of oil palm frond additions. This research is a type of experiment with a randomized block design (RBD) arranged non-factorial and the data is processed using the SPSS 20 Tukey test program. This study used a brick-shaped sample with a length of 19 cm, a width of 9.5 cm and a height of 4.5 cm. Variations in the composition of the added oil palm fronds are 0%, 5%, 10%, 15%, and 20%. Parameter mechanical properties of bricks included porosity, and compressive strength tests. The addition of oil palm fronds with a composition percentage of 0% to 10% affected the mechanical properties of the bricks by reducing porosity and increasing the compressive strength of the bricks. Based on the test results obtained by each of the best test values, namely the minimum porosity value achieved in the percentage of oil palm fronds as much as 10%, which is 18.4%. The optimum compressive strength value is achieved on the percentage of oil palm fronds as much as 10% which is equal to 20.5 N / mm².
Abstract— Along with the arrival of the rainy season in October 2018 - April 2019, the awareness of the emergence of Dengue Fever needs to be improved. Several methods for anticipation have been carried out, including by improving environmental cleanliness and holding mosquito spray or Fogging. These methods are considered to be ineffective in breaking the growth chain of Aedes Aegypti, which is the type of mosquito that most spreads Dengue Fever. To prevent infection, the World Health Organization (WHO) has also suggested controlling mosquito populations and protecting people from mosquito bites. This research uses the comparative method of Dengue Fever data in 2015, 2016, and 2017 of Jombang Regency. The data is correlated with average rainfall. Based on observations, the cases of Dengue Fever are repeated every year. The health office must socialize what dengue fever is, what are the symptoms, how to treat it if infected, and how to prevent it. The community needs to improve the cleanliness of the environment and be aware of water reservoirs or puddles if the rainy season. The presence of Jumantik cadres is very urgent and needed. Keywords—: Dengue Fever; rainy season; Aedes Aegypti; cleanliness of the environment.
Traffic lights have a vital role as regulatory systems to control the vehicles flowed in urban networks. This research is based on the real case. The traffic lights are installed at a massive intersection of an urban network consisting of four sections. The systems control implements the modification of the Norwegian traffic lights states. The behavior of traffic lights states were modeled using Petri net method. For the model verification and validation, the invariants and simulation were applied. The purpose of the implementation of this control system was to reduce travel delays. The intersection performance level was good while the average travel delay on all sections was low. The method used for the testing was the comparison of the simulation results due to the settings that apply the standard system to the imitation of the reality of the system using modifications of the Norwegian traffic lights states. The control system was able to reduce the travel delays slightly. The average of Level of Service (LoS) index of the roads for all sections was at level D. It improved the performance of the intersection, but not yet significant. In addition to setting traffic lights, the presence of flyovers is urgent to improve travel delays.
Abstract— Slope slides can occur if the specific gravity of the land working as the driving force is greater than the shear stress that serves as a restraining force. To prevent landslides there are several methods that can be used, one of them is using sheet pile as a soil barrier. Besides working to hold the soil, the sheet pile also functions to prevent the entry of water into dug pits, so it is very good to be used at the edge of the sea or river. The formulation of the problem that arises is how the value of active and passive soil pressure on the sheet pile, as well as how the suitable CPC Sheet Pile specifications are used in this study. The research method used is geotechnical analysis for sheet pile retaining walls. Based on soil data and calculation analysis, the value of active soil pressure on sheet pile is 104.06 kN / m and the value of passive soil pressure is 206.19 kN / m2. The CPC Sheet Pile specification used is Type W-600A, 15 meters long with Mcrack = 50.6 Ton.meter. Keywords—: Slope slides; sheet piles; the value of active and passive; geotechnical analysis.
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