Articles
<![CDATA[Penyusunan Model Elemen Hingga Interaksi Persamaan Aliran dengan Persamaan Sebaran Udara ]]>
<![CDATA[Adam Pamudji Rahardjo, Jazaul Ikhsan ,]]>
<![CDATA[ Jurnal Semesta Teknika Vol 15, No 1 (2012): MEI 2012 ]]>
Publisher : <![CDATA[Jurnal Semesta Teknika ]]>
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<![CDATA[Aeration process is one of water treatment processes. The process consists of two physical phenomena, flow, and spreading of air bubble. This research has developed a finite element model for three-dimensional flow and spreading of air bubble. The flow equation employs Navier-Stokes equation. The spreading of air bubble is modeled as convection-diffusion equation. The Navier-Stokes and the spreading of air bubble equation are combined by Navier-Stokes equation with additional new term, which shows the accelerated flow caused by the air bubble moves. The Navier-Stokes equation was solved in four stages, i.e., Taylor Galerkin convection approximation, viscous prediction, pressure correction and velocity correction stages. Galerkin Standard method was used to solve the spreading of air bubble equation. Quadratic brick finite elements with 20 nodes were used on the geometry. To show performance model, comparison to the result of air bubble investigation was carried out. The numerical model that has been obtained is capable of simulating the phenomena of air bubble spreading and flow. The numerical stability analyses showed that the numerical scheme of convection and diffusion equation based on Galerkin is stable for Courant Number £ 0.01 and Peclet Number <125.]]>
<![CDATA[Pengaruh Bentuk Pilar Jembatan Terhadap Potensi Gerusan Lokal ]]>
<![CDATA[Ikhsan, Jazaul]]>;
<![CDATA[Hidayat, Wahyudi]]>
<![CDATA[ Jurnal Semesta Teknika Vol 9, No 2 (2006): NOVEMBER 2006 ]]>
Publisher : <![CDATA[Jurnal Semesta Teknika ]]>
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<![CDATA[Pilar merupakan bagian dari struktur bawah jembatan. Keberadaan pilar pada aliran sungai menyebabkan perubahan pola aliran sungai. Perubahan pola aliran tersebut akan mengakibatkan terjadinya gerusan lokal di sekitar pilar. Penelitian ini bertujuan untuk mengetahui pengaruh bentuk pilar terhadap potensi gerusan lokal yang terjadi di sekitar pilar tersebut.Penelitian ini dilakukan pada kondisi aliran seragam permanen (steady uniform flow) dengan tiga variasi debit. Model fisik pilar yang digunakan adalah bentuk pilar persegi, bentuk pilar bulat dan bentuk pilar jajaran genjang. Hasil yang didapat dari rangkaian penelitian ini adalah semakin besar debit yang mengalir pada suatu penampang saluran maka gerusan lokal di sekitar pilar juga akan semakin dalam dan bentuk yang terbaik pada penelitian ini adalah bentuk bulat karena mempunyai potensi kedalaman gerusan yang terkecil.]]>
<![CDATA[Analisis Kebutuhan Air Irigasi Pada Daerah Irigasi Bendung Mrican1 ]]>
<![CDATA[Purwanto, Purwanto]]>;
<![CDATA[Ikhsan, Jazaul]]>
<![CDATA[ Jurnal Semesta Teknika Vol 9, No 1 (2006): MEI 2006 ]]>
Publisher : <![CDATA[Jurnal Semesta Teknika ]]>
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<![CDATA[Untuk merencanakan besarnya debit kebutuhan air yang diperlukan pada areal persawahan secara keseluruhan, maka perlu dilakukan suatu analisa kebutuhan air. mulai. Tujuan dari penelitian ini pada adalah melakukan analisa hitungan untuk mendapatkan besarnya debit kebutuhan air irigasi maksimal pada daerah irigasi Bendung. Penelitian ini dilakukan dengan cara mengambil data sekunder. Data tersebut dikompilasikan dengan metode Penman yang dimodifikasi untuk menentukan evapotranspirasi acuan (Eto), kemudian dikalikan dengan koefisien tanaman akan didapatkan nilai penggunaan konsumtif (consumtive use). Dengan faktor-faktor lainnya yang menunjang hitungan kebutuhan air seperti curah hujan efektif yang disesuaikan dengan jenis tanaman (padi/palawija), perkolasi besarnya diasumsikan dan kemudian menentukan pola tanamnya. Setelah itu dengan menggunakan rumus efisiensi tiap-tiap saluran maka kebutuhan air dapat ditentukan.Dari hasil analisis dengan menggunakan metode Penman dengan menggunakan sistem pola tanam Padi-Padi-Palawija dan menggunakan kebutuhan pengambilan 3 golongan dalam jangka waktu penyiapan lahan satu bulan, maka didapatkan besarnya nilai debit kebutuhan air irigasi maksimal masing-masing pada alternatif I yaitu 0,271 m3/dtk, alternatif II yaitu 0,254 m3/dtk dan alternatif III yaitu 0,261 m3/dtk. Didapatkan nilai debit kebutuhan air irigasi maksimal yang terkecil yaitu 0,254 m3/dtk]]>
<![CDATA[Analisis Pengaruh Metode Taman Hujan dalam Menurunkan Debit dan Kekeruhan Air Limpasan Permukaan ]]>
<![CDATA[Jufianto, Irfan]]>;
<![CDATA[Ikhsan, Jazaul]]>;
<![CDATA[Barid, Burhan]]>
<![CDATA[ Semesta Teknika Vol 16, No 2 (2013): NOVEMBER 2013 ]]>
Publisher : <![CDATA[Semesta Teknika ]]>
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<![CDATA[The alteration in land use causes the loss of infiltration areas replaced by rigid pavement yet demand for groundwater is increasing thus unbalance in hydrology cycle occurred and water became the problem for human as the problem for this country nowadays. One of the solutions to keep the storage of groundwater is to make the rain garden in the area near the run-off sources. Nonetheless studied about rain garden only focus on the effect of pollution in the river and study about the impact of reducing run-off debit and turbidity has not been explored yet. Three infiltration models that had been used for this research were infiltration model with soil-only, rain garden, and the rain garden with infiltration hole. The results presented by the study were compared to get the efficient value from each infiltration model in reducing debit and turbidity in the unsaturated and saturated soil. The result of this study showed that the rain garden model with infiltration hole performed better result with unit time reliability for 3 minutes and higher efficiency value of 54.17% on unsaturated soil and 53.81% on saturated soil. It can also reduce the suspension in the surface run-off until 0 mg/l.]]>
<![CDATA[Pengaruh Bentuk Pilar Jembatan Terhadap Potensi Gerusan Lokal ]]>
<![CDATA[Ikhsan, Jazaul]]>;
<![CDATA[Hidayat, Wahyudi]]>
<![CDATA[ Semesta Teknika Vol 9, No 2 (2006): NOVEMBER 2006 ]]>
Publisher : <![CDATA[Universitas Muhammadiyah Yogyakarta ]]>
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DOI: 10.18196/st.v9i2.868
<![CDATA[Pilar merupakan bagian dari struktur bawah jembatan. Keberadaan pilar pada aliran sungai menyebabkan perubahan pola aliran sungai. Perubahan pola aliran tersebut akan mengakibatkan terjadinya gerusan lokal di sekitar pilar. Penelitian ini bertujuan untuk mengetahui pengaruh bentuk pilar terhadap potensi gerusan lokal yang terjadi di sekitar pilar tersebut.Penelitian ini dilakukan pada kondisi aliran seragam permanen (steady uniform flow) dengan tiga variasi debit. Model fisik pilar yang digunakan adalah bentuk pilar persegi, bentuk pilar bulat dan bentuk pilar jajaran genjang. Hasil yang didapat dari rangkaian penelitian ini adalah semakin besar debit yang mengalir pada suatu penampang saluran maka gerusan lokal di sekitar pilar juga akan semakin dalam dan bentuk yang terbaik pada penelitian ini adalah bentuk bulat karena mempunyai potensi kedalaman gerusan yang terkecil.]]>
<![CDATA[Analisis Pengaruh Metode Taman Hujan dalam Menurunkan Debit dan Kekeruhan Air Limpasan Permukaan ]]>
<![CDATA[Irfan Jufianto]]>;
<![CDATA[Jazaul Ikhsan]]>;
<![CDATA[Burhan Barid]]>
<![CDATA[ Semesta Teknika Vol 16, No 2 (2013): NOVEMBER 2013 ]]>
Publisher : <![CDATA[Universitas Muhammadiyah Yogyakarta ]]>
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DOI: 10.18196/st.v16i2.4898
<![CDATA[The alteration in land use causes the loss of infiltration areas replaced by rigid pavement yet demand for groundwater is increasing thus unbalance in hydrology cycle occurred and water became the problem for human as the problem for this country nowadays. One of the solutions to keep the storage of groundwater is to make the rain garden in the area near the run-off sources. Nonetheless studied about rain garden only focus on the effect of pollution in the river and study about the impact of reducing run-off debit and turbidity has not been explored yet. Three infiltration models that had been used for this research were infiltration model with soil-only, rain garden, and the rain garden with infiltration hole. The results presented by the study were compared to get the efficient value from each infiltration model in reducing debit and turbidity in the unsaturated and saturated soil. The result of this study showed that the rain garden model with infiltration hole performed better result with unit time reliability for 3 minutes and higher efficiency value of 54.17% on unsaturated soil and 53.81% on saturated soil. It can also reduce the suspension in the surface run-off until 0 mg/l.]]>
<![CDATA[Penyusunan Model Elemen Hingga Interaksi Persamaan Aliran dengan Persamaan Sebaran Udara ]]>
<![CDATA[Jazaul Ikhsan , Adam Pamudji Rahardjo]]>
<![CDATA[ Semesta Teknika Vol 15, No 1 (2012): MEI 2012 ]]>
Publisher : <![CDATA[Universitas Muhammadiyah Yogyakarta ]]>
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DOI: 10.18196/st.v15i1.439
<![CDATA[Aeration process is one of water treatment processes. The process consists of two physical phenomena, flow, and spreading of air bubble. This research has developed a finite element model for three-dimensional flow and spreading of air bubble. The flow equation employs Navier-Stokes equation. The spreading of air bubble is modeled as convection-diffusion equation. The Navier-Stokes and the spreading of air bubble equation are combined by Navier-Stokes equation with additional new term, which shows the accelerated flow caused by the air bubble moves. The Navier-Stokes equation was solved in four stages, i.e., Taylor Galerkin convection approximation, viscous prediction, pressure correction and velocity correction stages. Galerkin Standard method was used to solve the spreading of air bubble equation. Quadratic brick finite elements with 20 nodes were used on the geometry. To show performance model, comparison to the result of air bubble investigation was carried out. The numerical model that has been obtained is capable of simulating the phenomena of air bubble spreading and flow. The numerical stability analyses showed that the numerical scheme of convection and diffusion equation based on Galerkin is stable for Courant Number £ 0.01 and Peclet Number 125.]]>
<![CDATA[Analisis Kebutuhan Air Irigasi Pada Daerah Irigasi Bendung Mrican1 ]]>
<![CDATA[Purwanto Purwanto]]>;
<![CDATA[Jazaul Ikhsan]]>
<![CDATA[ Semesta Teknika Vol 9, No 1 (2006): MEI 2006 ]]>
Publisher : <![CDATA[Universitas Muhammadiyah Yogyakarta ]]>
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DOI: 10.18196/st.v9i1.892
<![CDATA[Untuk merencanakan besarnya debit kebutuhan air yang diperlukan pada areal persawahan secara keseluruhan, maka perlu dilakukan suatu analisa kebutuhan air. mulai. Tujuan dari penelitian ini pada adalah melakukan analisa hitungan untuk mendapatkan besarnya debit kebutuhan air irigasi maksimal pada daerah irigasi Bendung. Penelitian ini dilakukan dengan cara mengambil data sekunder. Data tersebut dikompilasikan dengan metode Penman yang dimodifikasi untuk menentukan evapotranspirasi acuan (Eto), kemudian dikalikan dengan koefisien tanaman akan didapatkan nilai penggunaan konsumtif (consumtive use). Dengan faktor-faktor lainnya yang menunjang hitungan kebutuhan air seperti curah hujan efektif yang disesuaikan dengan jenis tanaman (padi/palawija), perkolasi besarnya diasumsikan dan kemudian menentukan pola tanamnya. Setelah itu dengan menggunakan rumus efisiensi tiap-tiap saluran maka kebutuhan air dapat ditentukan.Dari hasil analisis dengan menggunakan metode Penman dengan menggunakan sistem pola tanam Padi-Padi-Palawija dan menggunakan kebutuhan pengambilan 3 golongan dalam jangka waktu penyiapan lahan satu bulan, maka didapatkan besarnya nilai debit kebutuhan air irigasi maksimal masing-masing pada alternatif I yaitu 0,271 m3/dtk, alternatif II yaitu 0,254 m3/dtk dan alternatif III yaitu 0,261 m3/dtk. Didapatkan nilai debit kebutuhan air irigasi maksimal yang terkecil yaitu 0,254 m3/dtk]]>
<![CDATA[Correlation Analysis Between Measured Rain Data with Satellite at Rainfall Station in Merapi ]]>
<![CDATA[Ikhsan, Jazaul]]>;
<![CDATA[Sari, Amalia Kurnia]]>;
<![CDATA[Hairani, Ani]]>;
<![CDATA[Hidayah, Alidina Nurul]]>
<![CDATA[ Semesta Teknika Vol 27, No 1 (2024): MEI ]]>
Publisher : <![CDATA[Universitas Muhammadiyah Yogyakarta ]]>
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DOI: 10.18196/st.v27i1.22180
<![CDATA[Manual and automatic rain gauges often need to be revised in measuring rainfall due to various constraints. Therefore, using rain data from satellites will be a promising alternative. The rain data used is measured hourly rainfall data 20mm in 2012, 2017, and 2022. In addition, rain data from the PERSIANN and GPM satellites were also used. The analysis was carried out using the correlation coefficient (r) method, which aims to find the correlation between measured rain data and satellite rain data. The results show that the PERSIANN satellite has the highest correlation value in rain duration in two years, while the GPM satellite has the highest total depth and intensity correlation value in two years. Therefore, it can be concluded that the GPM satellite has better accuracy than the PERSIANN satellite in monitoring rain.]]>
<![CDATA[A Bibliometric Review of the Dam Construction Impact ]]>
<![CDATA[Fata, Nurul]]>;
<![CDATA[Ikhsan, Jazaul]]>
<![CDATA[ Semesta Teknika Vol. 27 No. 2 (2024): NOVEMBER ]]>
Publisher : <![CDATA[Universitas Muhammadiyah Yogyakarta ]]>
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DOI: 10.18196/st.v27i2.24852
<![CDATA[Dams are crucial constructions for managing water supplies. However, the detrimental environmental effects of dam development have also drawn criticism. The influence of dam construction over the past fourteen years and new research trends are included in this study. This study aims to determine how many papers have been produced, how productive researchers are, and chart the evolution of dam impact publications. The analysis showed that 1312 publications related to the topic discussed were generated. The findings demonstrated that engineering and environmental studies were the main focus of research trends concerning the effects of dam development. This study provides an overview of the trends in the direction of existing literature for future research, and evaluation of research topics through existing topic clusters. China, the USA and the United Kingdom are the three leading countries in dam construction impact research in terms of publications.]]>
