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Jurnal Rekayasa
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Articles 246 Documents
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Studi Kekuatan Batu Bata Pasca Pembakaran Dengan Menggunakan Bahan Additive Serbuk Gergaji Kayu Setyanto Setyanto; Iswan Iswan; Hari Diantoro Rahmad
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 19, No 2 (2015): Edisi Agustus 2015
Publisher : UNIVERSITAS LAMPUNG

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The Increasing construction in Indonesia and the number of population which is increasing every year must be supported by better economy growth. Thus, the construction materials will continue to increase to support the needs of infrastructure construction. To support the development and growth, then brick as a construction material will be needed. One of the method that can be used to improve the quality of the soil material is to use mixing ingredients (additives) such as sawdust to facilitate the combustion process and as a pore-forming on bricks. Based on the explanation above , it is necessary to do an objective study of making bricks, so that sawdust can be used as an right mix alternative in the manufacture of bricks, in the hope of sawdust waste is not wasted, but it can add power to brick and can produce bricks with good quality. Soil samples were tested in this study is a fine-grained soil from the Yosomulyo village, East Metro District, Metro City. Variations in the levels of the mixture used is 5%, 10%, 15% and 20%, with a curing time of 14 days as well with post-combustion treatment on the brick. Based on the results of physical testing of the original soil, USCS classified the soil samples as fine-grained soil and included in the ML group. This study used additive materials, such as wood sawdust mixture, on the mixture of 5% level, red brick experienced an escalation compared to bricks that are not mixed with additive materials. At the levels of a mixture of 10%, 15% and 20%, bricks decreased, both in terms of compressive strength and quality of bricks. So, in a mixture of 10%, 15% and 20%, the brick is not recommended for use as a building material because it does not fit to the requirements of SNI 15- 2094-2000 and water absorption rate is only 15% the level of compliance with the standards between 14% to with 18%.
Daftar Isi Jurnal Rekayasa Edisi Desember 2015 Ahmad Zakaria
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 19, No 3 (2015): Edisi Desember 2015
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Daftar Isi Jurnal Rekayasa Edisi Desember 2015
STUDI POTENSI SUMBER DAYA AIR UNTUK PEMBANGKIT LISTRIK TENAGA MIKROHIDRO DI PEKON TUGU RATU KECAMATAN SUOH KABUPATEN LAMPUNG BARAT PROPINSI LAMPUNG Dyah Indriana Kusumaastuti; Dwi Joko Winarno; Humaidi Humaidi
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 19, No 3 (2015): Edisi Desember 2015
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Water resources in Western Lampung Regency particularly the sub-District Suoh has a lot of po- tential hydropower, which have not been able to optimally utilized as electrical energy. So that one of the optimal effort that can be done is by using microhydro energy. Location of the research is in the Way Sekanda river tributary of the Way Semaka river. Process analysis using primary data in the form of a cross section of the river cross-section of data and flow velocity of Way Sekanda, than secondary data from hourly discharge data from the watershed outlet Way Besai for 11 (eleven) years, the real-time of rainfall in Tugu Ratu village from Septem- ber 2012 to September 2014 and watershed area derived from Geographic Information System. Analysis starts from the formation of spatial data maps of Way Semaka watershed, Way Besai wa- tershed and Way Sekanda watershed using ArcGIS program. Research method includes regional- ization Way Semaka watershed and Way Besai watershed, estimation the dependable discharge (Q 80% ) using FDC method, measured discharge calculation of Way Sekanda river, correlation be- tween discharge FDC method and measured discharge and calculate the electric power which can be generated. The formation of the watersheds were done using spatial data analysis and were found that the area of Way Semaka watershed is 731,0783 km 2 , Way Besai watershed is 415,0393 km 2 , Way Sekanda watershed is 1,48 km 2 . Using measured discharge recorded in Way Besai watershed and the application of regionalization method, the discharge at Way Semaka and Way Sekanda can be estimated.This is evidenced by the amount of discharge calculated by the method of Flow Dur- ration Curve is not much different from the magnitude of the discharge measured in the field. Q80 % with FDC method (Flow Duration Curve) to Way Sekanda River is 0,0312 (m 3 /sec), while the measured discharge in location of Way Sekanda micro hydro power plants (MHP) 0,0314 (m 3 /sec). From the calculation of the electric power in Way Sekanda by using dependable of dis- charge 50% (Q 50% ) of 0,0592 m 3 /s it is obtained the electricity power with an efficiency of 60 % is 2,7479 kW, while the electric power with an efficiency of 90 % is 4,1219 kW. Therefore Way Sekanda River is potential for micro hydro power plants (MHP).
ANALISIS PERBANDINGAN PARAMETER TRANSFORMASI ANTAR ITRF HASIL HITUNGAN KUADRAT TERKECIL MODEL HELMERT 14-PARAMETER DENGAN PARAMETER STANDAR IERS Romi Fadly; Citra Dewi
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 18, No 1 (2014): Edisi April 2014
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This research aims to compare the 14 transformation parameters between ITRF from computation result using the Helmert 14-parameter models with IERS standard parameters. The transforma- tion parameters are calculated from the coordinates and velocities of ITRF05 to ITRF00 epoch 2000.00, and from ITRF08 to ITRF05 epoch 2005.00 for respectively transformation models. The transformation parameters are compared to the IERS standard parameters, then tested the signifi- cance of the differences. The transformation parameters are used to reversly transform to obtain the common points coordinates ITRF00 and ITRF05 system. The value of 14-parameters are also used to transform the check points coordinates on the ITRF00 and ITRF05 coordinate system. The results show that the RMSe difference of the coordinates of the reverse transformation result with Helmert model using computed transformation parameters and the IERS standar parameters are 0.1 mm (for ITRF00) and 0.8 mm (for ITRF05). The results of significance test of 14 parameters to IERS standard parameters are only scale factor (ds) on the transformation from ITRF05 to ITRF00 statistically significant difference. However RMSE values of the coordinate transforma- tion of the check points (Helmert model) using calculated and IERS standar parameters are not difference. It can be concluded that the results of the transformation parameter of 14-parameter Helmert model with the least squares computation is not much different with IERS standard pa- rameters
Cover Belakang Jurnal Rekayasa Edisi April 2014 Ahmad Zakaria
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 18, No 1 (2014): Edisi April 2014
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Cover Belakang Jurnal Rekayasa Edisi April 2014
STUDI DIFRAKSI GELOMBANG MENGGUNAKAN PERSAMAAN HIPERBOLA Rama Kapitan
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 18, No 2 (2014): Edisi Agustus 2014
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The deformation of wave is the change of wave characteristics that occurs when a wave propa- gates shoreward. One form of the deformation of wave is diffracted wave. Wave diffraction occurs when a wave is blocked by a barrier which is a breakwater or an island. As a result, the wave will turn around the tip of the barrier and heading into a sheltered area behind it. In this event, the en - ergy transfer occurs in the perpendicular direction to the protected area. The phenomenon of wave diffraction is an important thing to consider in the harbor and breakwater design. To deter- mine the wave diffraction pattern caused by obstacles or coastal structures, wave propagation simulation has been carried out with mathematical or numerical models for several scenarios. In this study, two-dimensional wave simulation software using hyperbolic equations has been used to model wave propagation. The result obtained from this study is the diffraction coefficient whose value which is approximately equal to the ones suggested by the Shore Protection Manual (SPM, 1984). Changes in the pattern of the wave occur after the wave propagates through a single or double breakwater. This study also investigated the changes in the wave height and the amount of dominant wave period due to the influence of the breakwater. Both events indicate the occurence of phenomenon of diffraction.
Cover Belakang Jurnal Rekayasa Edisi Agustus 2014 Ahmad Zakaria
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 18, No 2 (2014): Edisi Agustus 2014
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Cover Belakang Jurnal Rekayasa Edisi Agustus 2014
REVITALISASI JARINGAN IRIGASI RAWA SUB-SEKUNDER UNTUK MENINGKATKAN PRODUKTIFITAS HASIL PERTANIAN (STUDI KASUS IRIGASI SUB-SEKUNDER RAWA PITU SP 2) Arifaini, Nur; Zakaria, Ahmad; Setiawan, Randy
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 18, No 3 (2014): Edisi Desember 2014
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Lampung Province has a fairly wide swamp area, one of them is in Rawa Pitu area. Swamp irri- gation in Rawa Pitu area has not been used extensively. The purpose of this research is to conduct a study, analysis, and systematically arranged recommendations on revitalizing Rawa Pitu swamp area that can be optimized to increase food crops production in order to improve the welfare of society. The research site is located in the sub-district of Rawa Pitu, Tulang Bawang regency. The location of Rawa Pitu is between the Tulang Bawang and the Pidada rivers. Analysis in this study is more focused on the revitalization of the sub-secondary of swamp irrigation system to increase agricultural productivity in Rawa Pitu area by comparing before and after revitalization. From the calculation, it is obtained that: the maximum of 3 days cumulative daily rainfall with the 5 years return period is obtained 104,12 mm and the amount of drainage modulus is obtained at 4,016 mm / day. Agricultural yield before revitalized, for the rice, the profit is Rp.13.697.819.386,- and for the crops, the profit is Rp.12.452.563.078.-. Agricultural production after revitalized is in- crease, for the rice, the profit is Rp.18.739.594.819,- and for the crops, the profit is Rp.17.035.995.290,-. The value of benefit cost ratio is about 1,38 and it is greater than 1,0, so that there is a profit, and net present value is positive, it is Rp.7.642.988.768,-.
Cover Belakang Jurnal Rekayasa Edisi Desember 2014 Zakaria, Ahmad
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 18, No 3 (2014): Edisi Desember 2014
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STUDI OPTIMASI POLA OPERASI IRIGASI DI DAERAH IRIGASI LAMBUNU PROPINSI SULAWESI TENGAH Aslinda Wardani
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 19, No 1 (2015): Edisi April 2015
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Lambunu Irrigation Area is administratively part of ParigiMoutong Regency, Central Sulawesi Province. This irrigation area is supplied by Lambunu River through its intake in Lambunu Weir and the irrigation water is supplied gravitationally. In the year 2014, planting pattern used in the area was paddy-paddy with 3,825 ha and 3,645 ha for planting schedule I and II, respectively. Ir- rigation operational pattern in Lambunu varied due to the development in irrigation system, the decrease of function of irrigation structures, the change of cropping pattern, and the fluctuation of irrigation water availability. Today, Lambunu Irrigation Area captures 5,041 ha of potential areas. Due to the changes in irrigation system and water availability, it is necessary to do some optimiza- tion in irrigation operational patern in Lambunu in order to find optimum planting area and opti- mum farming production. Of some alternatives irrigation operational patterns, carried out based on grouped and rotation system for paddy-paddy-secondary crops, the most optimum irrigation operational patterns has been found. It is irrigation operational patterns with ungrouped system and three planting schedules as follows: - Paddy I is in December I to March II - Paddy II is in April I to July II - Secondary crops in August I to November II Crop intensity for paddy and secondary crops in the area is 200% and 23%-28%, respectively. Grouped system will give the same result. However, it will reduce the maximum discharge of irrigation water demand.

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