Numerical calculation and plotting has been done for parabolic trajectories with Python 3.7 equipped matplotlib for variations gravitational acceleration. Based on graph, the parabolic trajectories had no effect significantly based the highest and lowest gravity accelaration except the further horizontal distance will create a certain differentiation. We also plotted the parabolic trajectories for enormous matter such us planet. We found that the smaller gravitation could made the parabolic trajectories liniearized.

Energy matahari merupakan energy terbarukan yang dapat dimanfaatkan untuk menghasilkan energy listrik. Sedangkan yang dapat mengkonversi energi cahaya matahari menjadi energi listrik adalah photovoltaic cell. Akan tetapi dalam proses pengkonversian energy cahaya ini ada kendala yang dipengaruhi beberapa faktor sehingga mengurangi optimalisasi system kerja photovoltaic cell. Salah satu factor utama yang mempengaruhioptimalisasi system photovoltaic adalah radiasi sinar matahari yang berubah –ubah sehingga tidak maksimalnya sinar cahaya yang didapat. Dengan melihat permasalahan tersebut maka diperlukan alat penjejak matahari agar solar cell selalu tegak lurus menghadap matahari. System ini menggunakan sensor cahaya (LDR) dan keluaran berupa arus DC. Dengan aturan yang disesuaikan dengan kondisi, maka motor DC akan menggerakkan solar cell supaya bergerak mengikuti posisi matahari secara otmatis. Paper ini menyajikananalisa dan desain untuk penjejak Maximum Power Point Tracker (MPPT) dengan menggunakan Metode Fuzzy Logic (MFL).Dalam penghitungan pengendali penjejak orientasi matahari ini digunakan sistem Metode Fuzzy Logic (MFL) karena metode ini merupakan kontrol pada proses tahapan himpunan, proses fuzzyfikasi, aturan fuzzy, dan proses defuzzyfikasi dan karena metode ini sangat cocok untuk pengembangan produk selanjutnya. Penelitian ini menggunakan ATMega8yang mudah dipasang pada penggunaan solar cell mandiri maupun yang berskala besar

Energy matahari merupakan energy terbarukan yang dapat dimanfaatkan untuk menghasilkan energy listrik. Sedangkan yang dapat mengkonversi energi cahaya matahari menjadi energi listrik adalah photovoltaic cell. Akan tetapi dalam proses pengkonversian energy cahaya ini ada kendala yang dipengaruhi beberapa faktor sehingga mengurangi optimalisasi system kerja photovoltaic cell. Salah satu factor utama yang mempengaruhioptimalisasi system photovoltaic adalah radiasi sinar matahari yang berubah –ubah sehingga tidak maksimalnya sinar cahaya yang didapat. Dengan melihat permasalahan tersebut maka diperlukan alat penjejak matahari agar solar cell selalu tegak lurus menghadap matahari. System ini menggunakan sensor cahaya (LDR) dan keluaran berupa arus DC. Dengan aturan yang disesuaikan dengan kondisi, maka motor DC akan menggerakkan solar cell supaya bergerak mengikuti posisi matahari secara otmatis. Paper ini menyajikananalisa dan desain untuk penjejak Maximum Power Point Tracker (MPPT) dengan menggunakan Metode Fuzzy Logic (MFL).Dalam penghitungan pengendali penjejak orientasi matahari ini digunakan sistem Metode Fuzzy Logic (MFL) karena metode ini merupakan kontrol pada proses tahapan himpunan, proses fuzzyfikasi, aturan fuzzy, dan proses defuzzyfikasi dan karena metode ini sangat cocok untuk pengembangan produk selanjutnya. Penelitian ini menggunakan ATMega8yang mudah dipasang pada penggunaan solar cell mandiri maupun yang berskala besar.

Hydrotest machine is a machine used to test the strength and leakage of a pipe where this test is important to guarantee the quality of the pipe. This test works by filling the test pipe components with liquid and pressing it, then held for a certain amount of time to check for indication of leakage in the test pipe. There is a hydrotest machine specifically for testing 3 inch diameter pipes, the data obtained from machine research is able to produce a maximum pressure of 63.7 bar. This pressure is still able to reach the SNI 0039 standard with a thickness of 3.2 mm which requires a minimum testing pressure of 50 bar , to improve the test quality standards according to ASTM A53 standards for 3-inch pipes with a thickness of 5.49 which requires a maximum test pressure of 173 bar, cycle time test data starting from liquid filling, pressing process until completion in 35 seconds. The purpose of this study is to obtain a hydrotest engine design that has a more optimal performance and complies with ASTM A53 standards. The stages in this plan are the study of literature relating to the theory of hydrostatic pressure, making observations of hydrotest machines, carrying out old design analysis, re-planning the hydraulic system (intensifier) as a high pressure generator and adjusting the design to the recommended parameters.

Making steel construction especially fabrication, welding is required for joining materials. In this research, it is used for welding gusset on H-Beam in the frame of factory construction. However, the problem is the number of welding defects that arise due to welding. A good welding method is needed to avoid welding defects. The solution to overcome welding defects is the repair process, and if the welding process errors occur repeatedly, it needs a multiple repair process. In this study using low carbon steel SM 490 YB with a thickness of 15mm. The welding process of the FCAW welding method uses K-71T electrodes by varying the treatment without repair and repair 1x, 2x, 3x. Test methods are tensile test, bending test and hardness test. The results of tensile testing on repair 1x have a higher average tensile strength value of 548.62 N / mm2 than without repair which has a tensile value of 536.53 N / mm2. From the results of the arch test does not have an effect between the repair treatment with no repair of mechanical properties. In the hardness test the highest average hardness was found in the weld metal repair area 3x with a value of 83.1 (HRB) while the lowest average hardness value was in the base metal area without repair with a value of 64.8 (HRB).

In the current era, the growth of UMKM is a positive trend that is developing rapidly, as UMKM have considerable potential to help the welfare of the people in Indonesia. Jawa Timur is one of the provinces with quite significant economic growth rates reaching 7.22 percent at the end of 2012, which is from the contribution of the UMKM sector. But globalization brings a sizeable, because the domestic market is increasingly open which makes more goods and services from outside come in. UMKM are getting higher and tighter. The implication of that is that UMKM are obliged to increase competition such as improvements in the production operational process. Automatically it will increase the work productivity of these UMKM. In Kabupaten Malang There are around 1936 large or small scale industrial business units. From this small-scale workshop, it is necessary to analyze the income for UMKM to be able to compete in this globalization era. From the results of the calculation of the income of the UMKM Workshop it can be seen that the average level of work shop productivity in Kabupaten Malang is still in the low category. Daily Productivity in the light service category in table 2 obtained a result of 0.19 services per work hour. The monthly productivity for the heavy service category in table 3 results in 0.008 services per work hour.