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Jurnal Rekayasa
Published by Universitas Lampung
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Articles 8 Documents
 1 
Search results for , issue "Vol 19, No 3 (2015): Edisi Desember 2015" : 8 Documents clear
Cover Belakang Jurnal Rekayasa Edisi Desember 2015 Ahmad Zakaria
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 19, No 3 (2015): Edisi Desember 2015
Publisher : UNIVERSITAS LAMPUNG

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Cover Belakang Jurnal Rekayasa Edisi Desember 2015
PENGARUH KUAT TEKAN DAN KUAT GESER SAMPEL DRYSIDE OF OPTIMUM (KERING OPTIMUM) DAN WETSIDE OF OPTIMUM (BASAH OPTIMUM) PADA TANAH LEMPUNG Lumeilia Afriani; Iswan Iswan; Armen Febri
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 19, No 3 (2015): Edisi Desember 2015
Publisher : UNIVERSITAS LAMPUNG

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Abstract

Clay is a type of soil with low bearing capacity, the water is very large influence on the physical and mechanical behavior. Clay in the dry state optimum swell properties that are larger than the current optimum wet clay compacted. This is because at the time of clay in the dry state of opti - mum relative shortage of water so that the clay has a greater ability to absorb water. In experi - ments clay in dry conditions and wet optimum optimum useful to know the carrying capacity of the soil in dry and wet conditions. From the results of research conducted generate free compressive strength value (qu) and the value of cohesion (c) and the maximum shear strength soil in wet conditions the optimum moisture content, dry optimum and optimum. In optimum conditions produce the highest value for the com- pressive strength of free, direct shear strength and cohesion values. This is because the optimum conditions the maximum soil density, so that the soil is not easily mengemang. In dry conditions the optimum clay soil density unstable, so that the grains of soil are not mutually binding, whereas in wet conditions the optimum pressure on the grains of soil is very high, so that the soil has a high plasticity.
Analisa Karakteristik Hujan di Kota Bandar Lampung Margaretta Welly
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 19, No 3 (2015): Edisi Desember 2015
Publisher : UNIVERSITAS LAMPUNG

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Knowledge of the characteristics of rainfall causes floods and droughts is an important thing. This research intends to investigate the characteristics of rainfall in the city of Bandar Lampung in or- der to predict and anticipate events of drought and flood in Bandar Lampung. The data used in this study is the annual rainfall data obtained from four rainfall stations in Bandar Lampung from 1987 until 2006. The stations that are: Pahoman Station, Sukarame, Sumur Putri, and Kemiling (Sumber Rejo). The results showed that the pattern and trend of the respective data from each of the stations the rain is not too different from each other. Most of the stations showed decreased dy - namically on rainfall. Although this decline did not occur in the rest of the station, but in general decline is clearly visible when the trend was taken fourth. A dry year, the year in which the annual precipitation totals less than 90% of the average annual rainfall, dominated after the year 2000. Most of the rainfall in the year El Nino is below the average annual precipitation. Near Pahoman, there have been five times the annual rainfall is below average at the time of El Nino (1991, 1992, 1993, 2002, 2004). Near Sukarame, there has been four times the annual rainfall is below aver- age at the time of El Nino (1991, 1997, 2002, 2004). At the Sumur Putri station, there has been four times the annual rainfall is below average at the time of El Nino (1991, 1993, 2002, and 2004). Near Kemiling, there has been four times the annual rainfall is below average at the time of El Nino (1991, 1992, 1997, 2002). This suggests the possibility of EL Nino events are associ- ated with a decrease in rainfall in each station.
Sampul muka Jurnal Rekayasa Edisi Desember 2015 Ahmad Zakaria
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 19, No 3 (2015): Edisi Desember 2015
Publisher : UNIVERSITAS LAMPUNG

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Sampul muka Jurnal Rekayasa Edisi Desember 2015
Analisis Kinerja Jaringan Jalan di Provinsi Lampung dengan Menggunakan Pemodelan Transportasi Rahayu Sulistyorini; Dwi Herianto
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 19, No 3 (2015): Edisi Desember 2015
Publisher : UNIVERSITAS LAMPUNG

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On the purpose of future transportation service requirement accomodation, traffic network and public transportation development are needed, it is needed to connect all transportation modes. With limited budget of Lampung Province, this kind of development needs reference, so it can have integrated planning. The purpose of this reasearch are to recognise the movement pattern and the effect of wisdom application that relates to transportation network on Lampung Province, and to recognise the effect of development planning on transportation network.. Domain of the research are province street and national street in Lampung Province, Data of Origin Destination Matrix on 2009, which used in this reasearch are secondary data that obtain from daily survey data with Furness Method to get the sum of movement on wisdom application planning. The result of the research are (1) Amount of movement patterns show a continous movement pat- tern of people from Palembang to Java Island and vice versa on 2014 is 8 million passengers for a year and from Bengkulu to Java Island and vice versa is 0,7 million passengers for a year, (2) All of scenarios increase street performance, especially after railway and Sumatera Toll development. After railway development, value of VCR changes from 0,83 to 0,45 on Simpang Asahan-Simpang Mesuji D. And the effect of Sumatera Toll development is value of VCR changes from 1,29 to 0,45 on Simpang Terbanggi Besar-Bandar Jaya, (3) Development of street network planning on traffic network and public transportation, railway, acrossing network, sea network, and air network on Lampung Province are needed.
Daftar Isi Jurnal Rekayasa Edisi Desember 2015 Ahmad Zakaria
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 19, No 3 (2015): Edisi Desember 2015
Publisher : UNIVERSITAS LAMPUNG

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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
Publisher : UNIVERSITAS LAMPUNG

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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).
PEMODELAN PERIODIK DAN STOKASTIK CURAH HUJAN HARIAN DARI WILAYAH PRINGSEWU Ahmad Zakaria
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 19, No 3 (2015): Edisi Desember 2015
Publisher : UNIVERSITAS LAMPUNG

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This research are intended to study the periodic and stochastic modeling of daily rainfalls. The study was carried out using data of daily rainfall with a length of 16 years (1991 – 2006) from Podorejo, Fajar Esuk, and Panutan rainfall stations. The rainfall series used is assumed to be free of trend. In this research data series were converted into series of rainfall sepektrum using FFT (Fast Fourier Transform). Periodicity of daily rainfall data is presented using 253 periodic com- ponent. Stochastic rainfall series of rainfall data is assumed as the difference (error) between the rainfall data with periodic rainfall model using data length of 512 days. Based on the data series, stochastic component were calculated using the approach of the autoregressive model. Stochastic models presented here are by using an autoregressive model of third order. The results of this research is the value of the correlation coefficient of the three stations. For this study, the average correlation coefficient (R) between data and periodic model is about 0,9770, between data and stochastic model is 0,9979, and between the data and the periodic stochastic model is 0,99991. From these results, it can be concluded that periodic stochastic model of the rainfall from Pringsewu area that processing model using 253 components, presented a very sig- nificant approach.

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