Jurnal Ilmiah Poli Rekayasa
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Model Hidrologi Terdistribusi untuk Analisis Debit Terserap pada Sumur Resapan, Lubang Biopori dan Kolam Retensi
Full text linkInfiltration wells, biopore holes, retention ponds serve to collect surface water from rain and then seep into the ground to become ground water reserves. This study aims to look at the application of a distributed hydrological model for the analysis of absorbed discharges in infiltration wells, biopore holes and retention ponds in the Batang Kuranji watershed. Research methods the study was conducted using a survey method that is secondary data collection and primary data. In this study the techniques of rainfall data analysis, Batang Kuranji watershed land use, Runoff analysis using distributed hydrological models and absorbed discharges in infiltration wells, biopore holes, retention ponds in the Batang Kuranji watershed. By applying model 4 using 1 infiltration wells, 2 biopore holes and 4 retention ponds can reduce the runoff rate in the sub-watershed by 7.514% - 27.545%, for the watershed level can reduce the discharge of 15.297%, the more the number of absorption wells, biopori holes and retention ponds more effective in reducing runoff in the Batang Kuranji watershed
Modifikasi Unit PemotonMesin Pencacah Serat TKKS Menggunakan Silinder Pemotong Tipe Reel
Full text linkOil palm empty fruit bunches (OPEFB) are solid waste from the oil palm plantation industry with a fiber content of ± 70%, and can be used as a composite board reinforcement. From the results of previous studies found that the mechanical properties of composite boards of OPEFB fibers between the left, middle and right parts occur very large differences, this situation occurs because the length of the fiber used is not the same between 3-10 cm. The long fibers in addition to the adhesive mixing process are very difficult and long, also resulting in uneven strength of the boards on each side. The purpose of this study is to modify the design of the TKKS fiber chopping machine cutting unit using a reel type cutting cylinder, making the machine cutting unit, and testing the engine performance. From the results of engine design, the engine capacity is ± 85 kg / hour, the engine size is 110 cm x 36.5 cm x 49 cm, the motor power is 2.5 HP with a rotation of 1450 Rpm. The components of the chopper unit consist of the chopper holder measuring 8 cm x l5 cm x 13 cm, placed 3 pieces of planers which are 8 cm x 5 cm x 0.4 cm, the chopper shaft measuring 40 cm long and Ø 3 cm, the holder of the pin measuring Ø 16 cm with a thickness of 0.6 cm. From the results of engine performance testing, it is found that the capacity of the machine with 5 mm filter diameter is 35 kg / hour, diameter of 10 mm 48 kg / hour, diameter 15 mm 55 kg / hour and diameter of 20 mm is 65 kg / hour. The uniformity of the results in the filter hole 5 mm the average fiber length of 15-25 is 80%, the filter hole 10 mm fiber length an average of 30-40 mm by 82%, the filter hole 15 mm fiber length an average of 40-50 mm by 85%, and the filter hole 20 mm in fiber length an average of 50-60 mm by 80%
Design of a Transmission Mution Measurement System in Single Mode Cable Index and Multi Step Index Step Optical Models Due to Bending Data Factors with Fingers Using OPM and OTDR Measurement Equipment
Full text linkWarping that occurs in fiber optik cables has the potential to cause serious power losses and further leads to optikal fiber rupture. Therefore, it is necessary to measure the effect of the optikal fiber curvature on the power loss generated when the optikal fiber is curved. This study aims to determine changes in the intensity of light output through plastic optikal fibers. this research distinguish the type of single mode cable and multi mode with varying radius. This paper only discusses the calculation of light output that has been affected by the curve of the optikal fiber. from the analysis conducted with a fiber optik cable length of 100 m, attenuation of 0.001 db / km and a bending radius that varies with a bend radius of 8 cm, 2x4 cm and 4 cm. different optikal fiber warping losses are obtained. that single mode cable is better than multimode cable.
Kata Kunci : Serat Optik,bending, Redaman, Jari-Jari, Singel mode, Multi mod
Kajian Potensi Air Pengerak Pompa Hidram untuk Mengairi Sawah di Daerah Pakandangan Kabupaten Padang Pariaman
Full text linkEnergy is needed in mobilizing a mechanism both electric energy and energy derived from fossils. Hydram pump is a device to raise water from a low place to a high place by utilizing water impacts without using renewable energy. In Pakandangan, Padang Pariaman Regency, there is a water source that cannot be utilized to flow through the rice fields around 10 Ha. Because the rice fields are higher with water sources. The methodology is to survey the location and design the dimensions of the hydram pump. The results obtained head data height of incoming water is 2.5 meters, the height of water lift to the shelter is 7 meters the flow of water entering the pump is 25 lt / sec. The dimensions of the pump are the result of the design of a hydram 1 size with an inside diameter of 2 inche
Implementasi Sistem Pengukuran Redaman Serat Optik Pada Lekukan
Full text linkDutch electronics company, Philips, is testing LiFi technology. LiFi or Light Fidelity is able to deliver broadband internet connections through light intermediaries. According to Philips Lightning Olivia Qiu's Chief Innovation Officer, LiFi technology has great potential for today's digital era. Indeed, if you look at the current world trend, internet connection has now become one of the daily needs of humans just like the lighting needs produced by Philips massively. When radio frequency becomes increasingly dense, the light spectrum is a large untapped resource [kompas, 2018]. Based on the facts stated that communication using optical fiber becomes very important so that to optimize the fiber optic system an implementation of optical fiber attenuation measurements is made. In this study, the method of implementing the measurement of optical fiber attenuation at a wavelength of 875 nm was introduced. This optical fiber attenuation measurement utilizes transmitter and receiver optical fiber systems that are connected to optical fibers with different lengths and curves. Attenuation for the length of 1, 3, 4, 5 and 6 meter optical fibers is 0.034, 0.558, 0.625, 1.156 and 2.170 dB respectively in straight optical fiber conditions. The power values for each optical fiber with lengths 1, 3,4,5 and 6m respectively are 52.21, 51.58, 50.81, 45.08 and 30.05 dB when there are curves. The attenuation values of each 1, 3, 4, 5 and 6 m optical fiber lengths are - 0.746, - 0.8, - 0.864, - 1,384 and - 3,145 dB respectively when there is a curve
Kaji Eksperimen lengkungan Sudu Turbin Angin Savonius Tipe-U
Full text linkWind energy sources in coastal areas of Indonesia are generally one of the potential renewable energy sources (renewable energy resources) that are abundant, environmentally friendly and renewable. Savonius wind turbines can produce relatively high torque even at low wind speeds. Because it is very well developed to produce electrical energy. To get a large amount of electrical power, a large turbine construction is also needed which also requires a large amount of money, of course. For this reason, the dimensions of this wind turbine construction need to be developed, known as aspect ratio (Ar). Ar which has been studied is the cross section of the blade, as well as other values. Whereas the arch depth or blade length of type U is still likely to be studied. Therefore it is necessary to do research on type U blade arcs to get more power than before. Experimental method by making a prototype savonius type U wind turbine with 2 blades. The parameters varied only in terms of the ratio of arc length and blade cross section, other parameters followed the previous study. The expected experimental results get the aspect ratio (Ar) of the best blade in capturing wind energy and producing large electrical power
Home Automation dengan Memanfaatkan Mini Komputer Raspberry Pi sebagai Pengontrol Perangkat Elektronik melalui Jaringan Lokal
Full text linkMeningkatnya kesibukan manusia yang tidak dapat ditunda dalam kehidupan sehari-hari mengakibatkan manusia sekarang tidak memiliki cukup waktu luang untuk melakukan banyak kegiatan dalam waktu yang sama. Disinilah peran teknologi untuk mempermudah dan memperlancar kegiatan manusia dalam kehidupan sehari-hari. Dengan menggunakan Raspberry Pi, dibuatlah sistem Home Automation yang dapat menyelesaikan permasalahan tersebut. Sistem ini juga sangat berguna untuk membantu manusia yang memiliki kebiasaan buruk dalam hal penghematan daya listrik dan jangka waktu pakai sebuah perangkat elektronik, contoh sederhananya kebiasaan lupa dalam mematikan televisi.
Pada tugas akhir ini dirancang sebuah sistem dimana, nantinya user dapat melakukan kontrol terhadap beberapa perangkat elektronik yang terdapat pada miniature rumah. Pengontrolan dilakukan dengan mengakses ke webserver yang terdapat pada Raspberry Pi, kemudian melakukan kontrol melalui jaringan lokal. Jaringan lokal tersebut, terdiri dari 3 jaringan yang terhubung oleh 2 wireless router Linksys cisco WRT120N. Dalam melakkukan kontrol Raspberry Pi terhubung pada modul relay yang berfungsi sebagai pemutus dan penyambung arus listrik perangkat elektronik.
Hasil pengujian Home automation menunjukkan bahwa untuk dapat mengakses perangkat elektronik yang berada pada miniature rumah maka user dan server harus terhubung dalam jaringan lokal. Sistem ini diakses dengan media kabel dan wireless, dengan melewati beberapa wireless router sistem ini nantinya dapat diimplementasikan pada internet.
Kata kunci: Home Automation, Raspberry Pi, wireless router, Linksys Cisco WRT120N, webserve
Peningkatan Nilai CBR Tanah Dasar (Sub Grade) dengan Penambahan Kapur dan Abu Sekam Padi
Full text linkThe subgrade is very important on road construction, because its functions for support the traffic loads. The subgrade is not able to bearing capacity the traffic load , can cause damage such as cracks, settlement,and deformation on the flexible pavement or rigid pavement. to solve in this problems, it is necessary to improve the mechanical properties of subgrade for increasing soil bearing capacity and reducing the swelling potential. The Sicincin ring road - Lubuk Alung, Padang Pariaman district which has deformed, settlement and cracks on the road pavement, caused by poor bearing capacity of the subgrade. To solve these problems, it is necessary to have the soil improvements (stabilization) for subgrade
In this paper soil stabilization is done by mixing soil with lime and rice husk ash (variations in lime content of 5%, 8%, 11%, 14% and 17%) and rice husk ash (constant 2.5%) .The compaction test and CBR test is carried for each variation. The results in this study obtained the most optimal percentage of lime + rice husk ash is 11%, CBR design is 25%, and swelling value of 0.13%. CBR value of subgrade without lime and rice husk ash obtained CBR = 2.3%. So that there is a significantly increase in CBR value if using lime and rice husk ash as stabilization material for subgrade. These results can be used by experts to choose effective stabilization methods
Studi Sedimentasi di Sungai Batang Lampasi Sedimentation Study at Batang Lampasi River
No full textBatangLampasi River was located in Talawi village, Nagari Koto Nan GadangPayakumbuh, about 30 km from Bukittinggi, with 48.19 km river length and around 226 km2 Cathment Area. The river flow carries a lot of sediment material, causing siltation on the riverbed which causes the river to overflow in the surrounding area. Sediment transport was triggered by Lampasi watershed erosion, that especially in the upstream section and settling on the riverbed. Prediction of depth decrease caused by sedimentation was conducted. Theoretical flood discharge determined used Nakayasu method. Sediment yield caused by land erosion determined by USLE equation and will compared with total sediment transport that calculated for 5 years return period with Yang's, Engelund Hansen, Ackers and White's methods. HEC-RASS 4.0 was used to find the high of flood water level and also as input hydraulics term to calculating transport sediment. The equivalent value approaching sediment yield was Yang's method where the sediment transport value is 21294,763 tons / year with sediment thickness of 27.24 cm / year. With these deposits thickness we can see from HEC-RASS 4.0 modeling the elevation of high flood water during normal conditions and the presence of thick sediment deposits
Pengendalian Run-Off Dengan Sumur Resapan Di Kawasan Kampus Universitas Andalas Limau Manis Kota Padang (Studi Kasus Politeknik Negeri Padang)
Full text linkChanging the land use of the Limau Manis area from the forest to the campus area can directly reduce water catchment areas, where water cannot soak into the ground, so that water reserves in the ground become reduced and run-off increases. To overcome this problem, an environmental friendly run-off control study was carried out, namely with recharge wells. The purpose of this study was (1) to find out the storage capacity of each infiltration well in the Padang State Polytechnic Campus, (2) to find out the number of infiltration wells to reduce run-off in the Padang State Polytechnic Campus, and (3) to know the effect of levels ground water to changes in infiltration rate. The method used in this study is land use analysis using QGIS. Analysis of rainfall using the Normal, Log Normal, Gumbel and Log Pearson Type III methods. Test the validity and suitability of the distribution with the Chi-Square and Smirnov-Kolmogorof tests. Run-off discharge analysis is calculated using the Rational method. Primary data were obtained by field testing and infiltration well making. The results of this study were (1) the capacity (volume) of storage in each infiltration well was different, where the largest infiltration well volume was 4.6 m3 while the smallest infiltration well volume was 3.1 m3, (2) the number of infiltration wells can reduce run-off varies, with 186 units of infiltration wells reducing by 34.2% runoff discharge to 65.8%, 113 infiltration well units reducing by 20.4% runoff discharge to 79.6%, 60 infiltration well units reducing by 10.8% runoff discharge to 89.2%, and 31 infiltration well units reduce by 5.5% runoff discharge to 94.5%, and (3) changes in groundwater content from 30.6% -50.6% cause a decrease in infiltration rate of 0.1 cm / minute