Research has been conducted about change power and efficiency on turbine. Manufacture of turbine singer aims to determine the magnitude of the reviews on power output and efficiency due to the rotation of the turbine runner. Turbine runner done with variation 90 rpm, 70 rpm, 50 rpm, 30 rpm and 10 rpm. Of the various rounds of runner that shows the maximum power change occurred on lap 50 rpm, 70 rpm and 90 rpm. Maximum power lead to speed with discharge runners 70 rpm flow 0.0078 m3 / s at 4,572 watts. Power generated minumum on debit 0.0078 m3 / s occurred on speed runner 90 rpm of 3,674 watts. Maximum turbine efficiency occurs debit on flow 0.0078 m3/s and 70 rpm with a value of 28.342%, and then declined in round 50 rpm amounted to 24.477% and the lowest in round 90 rpm amounted to 23.189%. From the calculation of the efficiency obtained maximum value is obtained at a speed of 70 rpm with a flow runner debit 0.0078 m3 / s.
<span>Capacitor bank is a collection of power tools in the form of a capacitor that serves as a tool that can reduce or improve reactive power into the power grid. The load on the electricity network in general is an inductive load. If the average power factor (cos ϴ) is less than 0.85, the State Electricity Company will provide the reactive power in KVAR fines usage charges on customers. An effort should be done to reduce the reactive power. An installation of bank capacitor is suitable to be implemented in an industry AC loads. It will reduce the reactive power and improve the power factor. In the case of 380 V, 50 Hz, 500 kW AC loads are improved the power factor from 0.7 to 0.93 using genetic algorithm, thus the AC loads current and reactive power will be decreased. It is suitable that the AC loads current is inversely proportional to the power factor, and the reactive power is proportional to the AC loads current.</span>
One of the natural potentials as a source of electrical energy is solar energy. The sun is the main energy source for most of the processes that occur on the surface of the earth. Solar radiation received by the earth's surface is a fundamental input for many aspects, mainly an important parameter in the application of solar cells as electricity generation. Sun cells are devices that can convert sunlight into electrical energy. In this study the data collection of solar cell panel data is collected which includes the solar radiation data, the voltage data generated and the electric current data generated at each variation of the tilt angle 0 o , 8 o , and 16 o . This study aims to discover the effect of changes in the slope angle of solar cell panels on the efficiency of solar power generation systems. The study method used is an experimental development method which is carried out by using the tilt angle variation of the solar panel. The angle used by taking the tilt angle of the solar panel on the negative x-axis which aims to find the maximum tilt angle value. From the test results of 50 Watt Peak (WP) solar power plant installation, it can be concluded that the highest efficiency occurs at an angle of 16 o and at 09:00 with a value of 46.076 %, then the second occurs at an angle of 8o and at 09:00 with a value of 45,052 %, then the lowest efficiency occurs at a slope angle of 0 o and at 09:00 with a value of 43,986 %.
Sterculia tragacantha Lindl. plants are endemic plants existing in Papua and have the potential of secondary metabolite compounds. This research aimed to determine the antioxidant activity and fatty acid composition of S. tragacantha Lindl. leaf extract. The extract was obtained by maceration using methanol and n-hexane solvents. The antioxidant activity testing was carried out using DPPH (1,1-diphenyl 2-picrylhydrazyl) free radicals while the identification of fatty acid compounds was done using Gas Chromatography-Mass Spectrometry (GCMS). The results showed that the methanol and n-hexane extracts of S. tragacantha Lindl. leaves had a strong antioxidant activity of 2.25 ±0,09 ppm and 27,24 ± 1,25 ppm respectively. Meanwhile, the fatty acid main contents of the methanol and n-hexane extracts of S. tragacantha Lindl. leaves were Methyl palmitate, Methyl linolenate, Linolelaidic acid methyl ester, trans-9-elaidic acid methyl ester, and Methyl palmitoleate.
The woton leaves (Sterculia sp.) were collected from an island called Gag, Raja Ampat, West Papua, Indonesia in July, 2017. The objective of this study was to explore natural resources from Papua as an alternative raw materials for fish feed production. The leaves were cleaned, dried, grinded and finally analyzed to describe their chemical composition, vitamin C content and anti-nutritional content using the standard procedures. The findings showed that there were two types of woton plants (Sterculia sp.), namely Sterculia sp. and Sterculia trigacantha. The proximate composition for Sterculia sp. leaves was 4.8% protein, 0.5% fat, 64.32% water, 2.10% ash, 28.29% carbohydrate, and 81.79 mg/100 g vitamin C. The proximate composition for the Sterculia trigacantha leaves was 4.45% protein, 8.86% fat, 50.59% water, 1.4% ash, 34.22% carbohydrate, and 17.36 mg/100 g vitamin C. The woton leaves (Sterculia sp.) also contained secondary anti-nutrients/metabolites such as flavonoids, tannins, tannin errors, phenolic, and polyphenols. TLC Spectrophotometricometry test results showed that Sterculia sp. leaves contained hyperoside and routine flavonoids, whereas Sterculia trigacantha leaves contained compounds of quarcetin and routine flavonoids. The results of chemical and phytochemical screening tests showed that the leaves (Sterculia sp.) are potential and affordable raw material for fish feed production.
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