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PENINGKATAN PEMAHAMAN TENTANG SUDUT DWELL DENGAN MENGGUNAKAN ALAT PERAGA SISTEM PENGAPIAN Hakim, Lutfi; Wijanarko, Dwi; Hadromi, -
Jurnal Pendidikan Teknik Mesin Vol 9, No 2 (2009)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Negeri Semarang

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Abstract

Penelitian ini bertujuan untuk mengetahui peningkatan pemahaman mahasiswa tentangsudut dwell dengan menggunakan media alat peraga sistem pengapian. Populasi dalampenelitian ini adalah mahasiswa pengikut matakuliah Kelistrikan Otomotif JurusanTeknik Mesin Universitas Negeri Semarang yang terdiri dari 30 mahasiswa. Penelitiandilakukan dengan metode Quasi Eksperiment dengan pola pretest-post test one groupdesign dengan memberikan perlakukan tambahan penggunaan alat peraga dalam prosesperkuliahan. Data penelitian diperoleh dengan pretest (sebelum penggunaan alat peraga)dan posttest Karena yang dilakukan penelitian hanya satu kelas maka yang diambiladalah seluruh populasinya. Hasil analisis data menunjukkan bahwa ada peningkatanpemahaman tentang sudut dwell pada sistem pengapian setelah menggunakan alatperaga.Kata kunci: pemahaman, metode pengajaran alat peraga, sistem pengapian
ANALISIS MASERAL DENGAN METODE REFLECTANCE VITRINITE UNTUK MENGETAHUI KUALITAS BATUBARA PADA SUMUR AL 25, LAPANGAN KINTAP, KABUPATEN TANAH LAUT PROVINSI KALIMANTAN SELATAN, PT. ANUGERAH LUMBUNG ENERGI Hakim, Lutfi; Rachwibowo, Prakosa; Widiarso, Dian Agus; Zaqqie, Bagus
Geological Engineering E-Journal Vol 6, No 1 (2014): Volume 6, Nomor 1, Tahun 2014
Publisher : Geological Engineering E-Journal

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (619.291 KB)

Abstract

The spread of coal deposits in Indonesia is quite large, most of coal basin is located in Sumatra and Kalimantan. One of the basin that produce economical coal deposit with value of calories more than 6.000 kal/g in Tanjung Formation is Asam-Asam Basin (Darlan etc, 1999). PT Anugerah Lumbung Energi is one of the coal mining companies with mining working area on Asam-asam basin. Research area  is located  in Kintap field, Tanah Laut Regency, South Kalimantan. The aim of this research is to find out about coal quality using maceral analysis with vitrinite reflectance method on well AL 25 and spread direction of coal seam at the research area.Methods of research are descriptive and analysis. Based on these methods, done the stage of the analysis and interpretation with data supporting are stratigraphical data and laboratory data. Activities performed such as geological mapping, maceral analysis with vitrinite reflectance methods and coal quality interpretation on well AL 25. The software used to support this undergraduate thesis are the Arcgis ,Autocad X 5 and Corel Draw. In Undergraduate Thesis, the author has divided into five phases, such as lithology description, cropline withdrawal based on strike and dip, maceral analysis, coal quality interpretation and results correlation of maceral analysis, rank and coal quality on the well AL 25.Based on the result of analysis data, it can be interpreted that lithology at the research area are sandstones, siltstone, claystone and thin layer of coal. The direction of seam coal ( cropline ) at the research area is southeast - northwest based on strike / dip. The results of the maceral analysis for each seam produce rank between Lignite to High Volatile bituminous B, whereas the results of the quality analysis for each seam produces a caloric value ranging from 12040.35 to 13786.69 Btu/lb or ranged from High Volatile Bituminous C to High Volatile Bituminous B. Based on the result of maceral analysis, rank and coal quality, it can be concluded that there are a mutual relation between maceral, rank and coal quality. The mutual relation is when the high percentage value of vitrinite reflectance so that value of coal calorie is good too.
PENERAPAN LINEAR PROGRAMMING DALAM PENENTUAN KOMBINASI PRODUK GUNA MEMAKSIMALKAN LABA PADA UD PUTERA SROEDJI JEMBER Hakim, Lutfi; Paramu, Hadi; Gusminto, Eka Bambang
BISMA Vol 12 No 3 (2018)
Publisher : Jurusan Manajemen Fakultas Ekonomi dan Bisnis

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bisma.v12i3.9000

Abstract

Abstract: The purpose of this study is to analyze the constraints and the optimalproduct combinations in the production process to obtain maximum profit at UDPutera Sroedji. UD Putera Sroedji is one of the trading companies selling packagedrice that consisted of the 2.5 kg, 5 kg, and 25 kg packaging. In its productionprocess, the company experienced the problem or constraints regarding the lessoptimal use of resources to reach maximum profit. Linear programming can beused to allocate the limited resources in the production process in order to obtainmaximum profit. This research used forecasting and linear programming methodsto determine the optimal product combination at UD Putera Sroedji. Resultsshowed that UD Putera Sroedji should produce 200 units of 2.5 kg packaged rice,600 units of 5 kg packaged rice, and 148 units of 25 kg packaged rice in order toachieve a maximum profit of Rp 7,960,977 per month.Keywords: packaged rice, maximum profit, linear programming, and simplexmethod.Abstrak: Tujuan penelitian ini adalah untuk menganalisis kendal-kendala(constraints) dan kombinasi produk yang optimal dalam proses produksi untukmemperoleh laba atau keuntungan maksimal pada UD Putera Sroedji. UD PuteraSroedji merupakan salah satu perusahaan dagang yang bergerak dalamperdagangan beras kemasan, dalam kemasan 2,5 kg, 5 kg, dan 25 kg. Dalamproses produksinya, perusahaan menghadapi beberapa masalah atau kendalayang berhubungan dengan penggunaan sumber daya yang belum optimalsehingga laba yang didapatkan belum maksimal. Linear programming dapatdigunakan untuk mengalokasikan sumber daya yang terbatas untuk memperolehlaba maksimal. Metode analisis yang digunakan dalam penelitian ini adalahforecasting dan linear programming untuk menentukan kombinasi produk yangoptimal. Hasil analisis menunjukkan bahwa UD Putera Sroedji harus memproduksi200 unit beras kemasan 2,5 kg; 600 unit beras kemasan 5 kg; dan 148 unit beraskemasan 25 kg untuk mendapatkan laba maksimal sebesar Rp 7.960.977 perbulan.Kata Kunci: beras kemasan, laba maksimal, linear programming, metodesimpleks.
PENINGKATAN PEMAHAMAN TENTANG SUDUT DWELL DENGAN MENGGUNAKAN ALAT PERAGA SISTEM PENGAPIAN Hakim, Lutfi; Wijanarko, Dwi; Hadromi, -
Jurnal Pendidikan Teknik Mesin Vol 9, No 2 (2009)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Penelitian ini bertujuan untuk mengetahui peningkatan pemahaman mahasiswa tentangsudut dwell dengan menggunakan media alat peraga sistem pengapian. Populasi dalampenelitian ini adalah mahasiswa pengikut matakuliah Kelistrikan Otomotif JurusanTeknik Mesin Universitas Negeri Semarang yang terdiri dari 30 mahasiswa. Penelitiandilakukan dengan metode Quasi Eksperiment dengan pola pretest-post test one groupdesign dengan memberikan perlakukan tambahan penggunaan alat peraga dalam prosesperkuliahan. Data penelitian diperoleh dengan pretest (sebelum penggunaan alat peraga)dan posttest Karena yang dilakukan penelitian hanya satu kelas maka yang diambiladalah seluruh populasinya. Hasil analisis data menunjukkan bahwa ada peningkatanpemahaman tentang sudut dwell pada sistem pengapian setelah menggunakan alatperaga.Kata kunci: pemahaman, metode pengajaran alat peraga, sistem pengapian
ANALISIS MASERAL DENGAN METODE REFLECTANCE VITRINITE UNTUK MENGETAHUI KUALITAS BATUBARA PADA SUMUR AL 25, LAPANGAN KINTAP, KABUPATEN TANAH LAUT PROVINSI KALIMANTAN SELATAN, PT. ANUGERAH LUMBUNG ENERGI Hakim, Lutfi; Rachwibowo, Prakosa; Widiarso, Dian Agus; Zaqqie, Bagus
Geological Engineering E-Journal Vol 6, No 1 (2014): Volume 6, Nomor 1, Tahun 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (619.291 KB)

Abstract

The spread of coal deposits in Indonesia is quite large, most of coal basin is located in Sumatra and Kalimantan. One of the basin that produce economical coal deposit with value of calories more than 6.000 kal/g in Tanjung Formation is Asam-Asam Basin (Darlan etc, 1999). PT Anugerah Lumbung Energi is one of the coal mining companies with mining working area on Asam-asam basin. Research area  is located  in Kintap field, Tanah Laut Regency, South Kalimantan. The aim of this research is to find out about coal quality using maceral analysis with vitrinite reflectance method on well AL 25 and spread direction of coal seam at the research area.Methods of research are descriptive and analysis. Based on these methods, done the stage of the analysis and interpretation with data supporting are stratigraphical data and laboratory data. Activities performed such as geological mapping, maceral analysis with vitrinite reflectance methods and coal quality interpretation on well AL 25. The software used to support this undergraduate thesis are the Arcgis ,Autocad X 5 and Corel Draw. In Undergraduate Thesis, the author has divided into five phases, such as lithology description, cropline withdrawal based on strike and dip, maceral analysis, coal quality interpretation and results correlation of maceral analysis, rank and coal quality on the well AL 25.Based on the result of analysis data, it can be interpreted that lithology at the research area are sandstones, siltstone, claystone and thin layer of coal. The direction of seam coal ( cropline ) at the research area is southeast - northwest based on strike / dip. The results of the maceral analysis for each seam produce rank between Lignite to High Volatile bituminous B, whereas the results of the quality analysis for each seam produces a caloric value ranging from 12040.35 to 13786.69 Btu/lb or ranged from High Volatile Bituminous C to High Volatile Bituminous B. Based on the result of maceral analysis, rank and coal quality, it can be concluded that there are a mutual relation between maceral, rank and coal quality. The mutual relation is when the high percentage value of vitrinite reflectance so that value of coal calorie is good too.