The paper presents a triband circular polarized rectangular dielectric resonator antenna. A single coaxial cable feeds the DRA to a double stub strip on the DRA side. A patch strip coupled to the feed assists in widening the bandwidth of the proposed DRA. The degenerate mode pair TE∂11x and higher-TE∂23x has been excited to achieve CP and enhance the antenna gain. The higher-order mode has been excited using a low-cost simple excitation mechanism without compromising on the size and shape of the DRA. An impedance bandwidth of 48% with a gain ~6–9 dBic was achieved in all resonance frequencies. Additionally, the AR bandwidth of 5.5%, 4.2%, and 2.76% was obtained at three different frequencies. Note that the proposed DRA exhibits a wide beamwidth of 112o, which is good for better signal reception. A comparison between the measured with simulated results shows that the measured results are matched by the simulated result trends.
Maintain the availability of clean water in a multy-storey building make the water pump motor oprate continuously which can cause motor damage quickly, because there is no replacement system change of operation of the clean water pump motor conventional outomatic control. PLC (Programmable Logic Control) type Schneider Smart Relay Zelio Logic can be an opration to overcome clean water pump motor operation system to replace convensional automated system in to PLCbased automated systems. Simulation of the operational of a clean water pump motor in a multi-storey build use PLC software type Schneider Zelio Soft2 type SR2B121BD operate 3 clean water pump motors alternately between the source pump motor and the transfer pump motor, measurement of operating time transfer pump motor 1 with transfer pump motor 2 and the design of the alaram system trip to avoid damage to the motor using alarm rirens. Operating of PLC-based outomatic water pump motor very helpful oprator to operate the clean water pump motorized, where the operation of a clean water pump motor can be changed trought software as needed.
This paper provides a solution for charging cell phones (HP) using solar panels. The need for electrical energy consumption is increasing, so renewable energy sources are needed that must meet the requirements, namely to produce energy that is environmentally friendly, at economical costs. The use of solar panels is a wise thing for current conditions as an alternative energy source to be used as a source of charging cell phones (mobile phones). The use of solar panels as a source of electrical energy to facilitate battery charging when outdoors or when there is no other power source. In this study, a solar panel of 10 Wp, 21V dc is used as a power source and a buck converter as a voltage reducer from 12V to charge a 6V, 4500 mAh battery. The number of cellphones that use this battery charger is 4, while observations when charging cellphones are in the form of battery percentage from 50% to 100% with a charging time of 1 hour 30 minutes. Makalah ini memberikan suatu solusi untuk mengisi batere Handphone (HP) menggunakan panel surya. Kebutuhan akan konsumsi energi listrik semakin meningkat, maka diperlukan sumber energi terbarukan yang harus memenuhi syarat untuk menghasilkan energi yang ramah lingkungan, biaya ekonomis. Penggunaan panel surya merupakan hal yang bijak untuk kondisi saat ini sebagai sumber energi alternative untuk dimanfaatkan sebagai sumber pengisian batere telepon seluler (handphone). Penggunaan panel surya sebagai sumber energi listrik untuk memudahkan pengisian batere saat berada di luar ruangan atau saat tidak ada sumber listrik lainnya. Pada penelitian ini menggunakan panel surya 10 Wp, 21V dc yang berfungsi sebagai sumber listrik dan buck converter sebagai penurun tegangan dari 12V untuk mengisi batere 6V, 4500 mAh. Jumlah handphone yang menggunakan sumber pengisi batere ini sebanyak 4, sedangkan pengamatan saat pengisian batere HP berupa persentasi batere dari 50% ke 100% dengan waktu pengisian 1 jam 30 menit.
The Japanese Bandar Sei River is one of the rivers in Tanjungbalai City with a width of 5.1 km and a width of 6 meters. The river flows into the Asahan River. The river flow can be used as a source of electricity by constructing dams on the river. This is used by the author as a form of studies research. The technique used on this studies is the M.J Mock method to find the value of reliable water discharge and Flow Duration Curva for the probability of water discharge. Based on the findings of the research, the analysis of reliable water discharge calculations obtained from the analysis is 4.93 m3 / second. The potential for water power generated is Theoretical Power: 94 kW, Turbine Power: 130 kW and Generator Power: 116 kW. The average value of evapotranspiration is 150.88 mm.
Penelitian ini bertujuan untuk menurunkan rumusan interpolasi fungsi dua peubah dengna studi kasus. Dalam faktor pendingin angina untuk menghitung nilai interpolasi dalam table faktorpendingin. Interpolasi linier fungsi dua peubah dan interpolasi lagrange fungsi dua peubah untuk m=n=2 mengahsilkan hasil dan kesalahan yang sama pada kasus table faktor pendingin angina. Interpolasi linier karena m dan n dapat lebih besar dari dua, yang berarti lebih banyak menggunakan data. Interpolasi linier menpunyai kesalahan 5% sedangkan interpolasi lagrange yang menggunkan semua datamempunyai semua kesalahan relative sebesar 0.74%
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