Articles

KARAKTERISTIK PEMBAKARAN BATUBARA PERINGKAT RENDAH, CANGKANG SAWIT DAN CAMPURANNYA DALAM FLUIDIZED BED BOILER Mahidin, Mahidin; Khairil, Khairil; Adisalamun, Adisalamun; Gani, Asri
REAKTOR Volume 12, Nomor 4, Desember 2009
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (182.095 KB) | DOI: 10.14710/reaktor.12.4.253 – 259

Abstract

Penggunaan biomassa di unit pembangkit tenaga listrik sudah banyak dilaporkan oleh banyak peneliti dan praktisi. Tetapi, data untuk pembakaran cangkang sawit baik sebagai bahan bakar utama maupun pendamping sangat terbatas. Dalam studi ini, karakteristik pembakaran batubara peringkat rendah, cangkang sawit dan campurannya dalam fluidized bed boiler sudah dipelajari. Pada pembakaran batubara/cangkang sawit parameter pembakaran seperti konsentrasi gas, temperatur unggun dan efisiensi pembakaran dikaji terhadap efek udara berlebih (rasio udara/bahan bakar) dan ukuran partikel. Dalam pembakaran campuran, parameter-parameter tersebut dikaji terhadap pengaruh udara berlebih dan komposisi bahan bakar. Hasil percobaan menunjukkan bahwa efisiensi pembakaran maksimum untuk pembakaran batubara didapatkan pada udara berlebih tinggi (50%) dan ukuran partikel kecil (60+ mesh). Sedikit perbedaan teramati pada temperatur unggun dimana nilai maksimum muncul pada udara berlebih rendah (30%) tetapi ukuran partikel sama. Seperti yang diharapkan, fenomena yang sama juga terjadi untuk pembakaran cangkang sawit. Lebih lanjut, pada pembakaran campuran efisiensi pembakaran maksimum juga terjadi pada udara berlebih tinggi (50%) dan rasio bahan bakar (% berat) 50:50 untuk ukuran partikel 60+ mesh. Sama halnya dengan pembakaran batubara, temperatur unggun maksimum juga terlihat pada udara berlebih 30% dan rasio cangkang/batubara 20:80.
Sistem Pakar Penanganan Kasus Sengketa Tanah Menggunakan Metode Backward Chaining sapri, Sapri; Khairil, Khairil
Jurnal Teknik Vol 17 No 2 (2019): Jurnal Teknik
Publisher : Fakultas Teknik Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37031/jt.v17i2.28

Abstract

Land dispute is a conflict between two or more parties that have different interests in one or several objects of land rights that can result in legal consequences for both. Problems to explain government regulations and legislation relating to land dispute cases in a simple way that is, explained the rules that correspond to the problems that occur. This makes it difficult for a lawyer to deal with many clients and different cases. The purpose of this study is to design the Expert System for Handling Land Dispute Cases using the Backward Chaining Method. The study was conducted to analyze the existing needs, collect data, design, implement the results of the design into the application that is used, after that will be tested and maintained the system. The results of the study show that the existence of this expert system, it provides very meaningful benefits for the client, namely facilitating the client to carry out consultations regarding the handling of land dispute cases.
Modeling and Simulation on NOx and N2O Formation in Co-combustion of Low-rank Coal and Palm Kernel Shell Mahidin, Mahidin; Gani, Asri; Khairil, Khairil
Jurnal Rekayasa Kimia & Lingkungan Vol 9, No 2 (2012): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

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Abstract

NOx and N2O emissions from coal combustion are claimed as the major contributors for the acid rain, photochemical smog, green house and ozone depletion problems. Based on the facts, study on those emissions formation is interest topic in the combustion area. In this paper, theoretical study by modeling and simulation on NOx and N2O formation in co-combustion of low-rank coal and palm kernel shell has been done. Combustion model was developed by using the principle of chemical-reaction equilibrium. Simulation on the model in order to evaluate the composition of the flue gas was performed by minimization the Gibbs free energy. The results showed that by introduced of biomass in coal combustion can reduce the NOx concentration in considerably level. Maximum NO level in co-combustion of low-rank coal and palm kernel shell with fuel composition 1:1 is 2,350 ppm, low enough compared to single low-rank coal combustion up to 3,150 ppm. Moreover, N2O is less than 0.25 ppm in all cases.Keywords: low-rank coal, N2O emission, NOx emission, palm kernel shell
A Comparison of Energy Profile between Castilla Leon, Spain and Aceh, Indonesia Mahidin, Mahidin; Khairil, Khairil; Martin, Carmen; Villamanan, Miguel A.; Segovia, Jose J.; Chamorro, Cesar R.
Jurnal Rekayasa Kimia & Lingkungan Vol 7, No 4 (2010): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

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Abstract

A comparative study on energy production and consumption between Aceh, Indonesia and Castilla León, Spain has been conducted. Analysis was carried out on the statistical data such as population, GDP, energy production and energy consumption. Some interesting results were obtained. An average energy production during 2001 – 2004 in Aceh is up to 28 times of the average energy production in Castilla León; however, the average energy consumption during those four years is only 16.74% of the average energy consumption of Castilla León. Aceh's average GDP from 2001 to 2004 is 3,357.16 million Euros, stands at only 8.15% of Castilla León's average GDP about 41,175.75 million Euros.Keywords: economic growth, final energy consumption, GDP, primary energy production
PENGARUH MODEL PERKULIAHAN GENETIKA DI JURUSAN BIOLOGI FMIPA UM TERHADAP KEMAMPUAN METAKOGNISI MAHASISWA Khairil, Khairil
Jurnal Biologi Edukasi Vol 1, No 2 (2009): Jurnal Biologi Edukasi
Publisher : Jurnal Biologi Edukasi

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Abstract

The aim of this study is to determine the impact of lecture model of Genetics towards students’ metacognition skills based on class category, basic academic skill, and types of subjects. This study was conducted at FMIPA Biology department of UM involving students in education class and non-education class for 2 semester. The instruments used in the research were observation sheets of Genetics lecture, metacognition awareness inventory (MAI), and documents of observation sheet. Anakova with Least Significant Difference (LSD) was used to analyse the data. The result showed that the steps in the lecture model of Genetics comprising instucting reading assessment related to lecture material, composing summary of reading material, setting questions and the answers, and having presentation and discussion. Project-based practical work and classic practical work were used in practical work assessment. Evaluation tools was used based on average score of paper and pencil test and alternative assessment. Students’ metacognition skills were not influenced by class factor (education and non-education, basic academic skill [high or low], and types of Genetics subjects [Genetics I and Genetics II). 
Penerapan Model Pembelajaran Berbasis Proyek untuk Meningkatkan Keterampilan Proses Sains Siswa pada Konsep Pencemaran Lingkungan di SMP Umara, Cut Zaitun; Nurmaliah, Cut; Khairil, Khairil
Biotik Vol 4, No 2 (2016): JURNAL BIOTIK
Publisher : UIN Ar-Raniry

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/biotik.v4i2.1085

Abstract

The purpose of this study is to improve science processing skills of students of SMPN 8 Banda Aceh in the concept of pollution and environmental degradation by using project-based learning. An experimental method with pretest-posttest control group design was used in this study. The population was all students of class VII SMPN 8 Banda Aceh which consisted of 5 classes with total number was 130 students. The samples were selected by using simple random sampling technique. There were 44 students from VII-1 acted as control group and class VII-2 acted as experimental group. The data were gathered by using pre-test and post-test. The research instruments used were essay questions to measure science processing skills, student???s work sheet, and work assessment???s rubrics based on science processing skills. The data then analyzed by calculating the post-test and pre-test gain and t-test to compare between the experimental class and control class. They were analyzed by using independent sample t-test. The results showed that there were improvement in the average of science processing skills of students in project-based learning???s class for about 51.86 (high) and conventional learning class for about 38.02 (medium). T-test results obtained as follows: tvalue was 2.680 and ttable was 2.021, so tvalue>ttable. The conclusion was the implementation of project-based learning in the concept of pollution and environmental degradation improved the science processing skills of student of SMPN 8 Banda Aceh.
PENERAPAN MODEL PEMBELAJARAN KOOPERATIF TIPE TEAM GAMES TOURNAMENT (TGT) BERBASIS PRAKTIKUM TERHADAP PENGUASAAN KONSEP SISTEM PENCERNAAN MANUSIA DI SMA NEGERI 1 SIGLI Rosdiani, Rosdiani; Khairil, Khairil; Nurmaliah, Cut
Jurnal Biologi Edukasi Vol 5, No 2 (2013): Jurnal Biologi Edukasi
Publisher : Jurnal Biologi Edukasi

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Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh model pembelajaran kooperatif tipe TGT terhadap penguasaan konsep sistem pencernaan manusia di SMA Negeri I Sigli. Metode yang digunakan adalah metode eksperimen dengan rancangan Pretest-postest Control Group Design. Populasi penelitian adalah  seluruh siswa kelas XI IPA SMA Negeri I Sigli semester dua sebanyak 8 kelas dengan jumlah siswa 240 orang, sedangkan sampel dalam penelitian ini diambil secara acak atau random sampling sebanyak 60 siswa yang terdiri dari 30 siswa kelas XI-IPA5 sebagai kelas eksperimen dan 30 orang siswa kelas XI-IPA6 sebagai kelas kontrol. Pembelajaran kelas eksperimen diajarkan dengan menggunakan model pembelajaran kooperatif tipe TGT berbasis praktikum, sedangkan kelas kontrol diajarkan dengan model pembelajaran kooperatif tipe TGT tanpa praktikum. Teknik analisis data dilakukan dengan uji t dengan bantuan program SPSS 16.0 for windows. Hasil penelitian menunjukkan bahwa terjadi perbedaan yang signifikan penguasaan konsep terhadap siswa yang diajarkan melalui model pembelajaran TGT berbasis praktikum dengan siswa yang diajarkan dengan model pembelajaran kooperatif tipe TGT tanpa praktikum, dengan perbedaan keduanya pada taraf P < 0,05, t hitung = 7,570 > t tabel = 2,000  untuk penguasaan konsep. Dengan demikian, terdapat perbedaan yang signifikan penerapan model pembelajaran kooperatif tipe TGT berbasis praktikum terhadap penguasaan konsep siswa pada konsep sistem pencernaan manusia.
Uji Performansi Mesin Yanmar TS 50 Menggunakan Bahan Bakar Biodiesel dari Minyak Kepayang (Pangium Edule) Turmizi, Turmizi; Khairil, Khairil; Thalib, Sulaiman
Jurnal Teknik Mesin Unsyiah Vol 2, No 1 (2014)
Publisher : Jurnal Teknik Mesin Unsyiah

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Abstract

Fruit Football is a type of plant that is widely available in Aceh and is not utilized by the community. This research will be studied in experiments of fruit fooball as biofuel in diesel engines. Diesel engines are used in this test is a single cylinder four stroke engine water-cooled Yanmar brand, type TS 50 with specs: Maximum Power 5 HP, maximum rotation 2400 rpm, maximum torque 2.29 kg.m at 1600 rpm and compression ratio 17.9: 1. Performance testing is done with a diesel engine intended to determine the amount of power generated, the level of fuel consumption, specific fuel consumption and thermal efficiency. Testing is done with two variations of biodiesel fuel that B-10 and B-20 as well as diesel fuel for comparison. The results obtained from this study is that the power generated from diesel fuel is greater than the other two fuels, while more efficient fuel consumption B-20 followed by B-10 and diesel fuel. Specific fuel consumption results are varied while the higher thermal efficiencies generated by the B-20 of the B-10 and diesel fuel at high speed.
Physical Characterization and Desulfurization of Biobriquette Using Calcium-Based Adsorbent Mahidin, Mahidin; Gani, Asri; Khairil, Khairil
Makara Journal of Technology Vol 15, No 2 (2011)
Publisher : Directorate of Research and Community Services, Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (192.261 KB) | DOI: 10.7454/mst.v15i2.220

Abstract

Combustion of coal and co-combustion of their co-fuel contribute to gas emissions. Among the gas emissions are SOx, NOx, CO and CO2. Introduction of calcium based adsorbent is addressed to absorb SO2 that release to the atmosphere during the combustion process. Objective of the research is at first to observe the physical characteristics of biobriquettes as a function of briquette compositions (coal to palm kernel shell ratios) and Ca/S ratios (Ca in adsorbent and S in briquette) using a natural adsorbent (shellfish waste). The second objective is to investigate desulfurization characteristics as a function of Ca/S ratios and desulfurization temperatures at coal to palm kernel shell ratio of 90:10 (wt %). Ratios of coal to palm kernel shell in this study are 90:10, 80:20, 70:30, 60:40 and 50:50; and Ca/S ratios are 1:1, 1.25:1, 1.5:1, 1.75:1 and 2:1. Binding agent used is the mixture of Jatropha curcas seeds and starch as much as 10% (wt). It was found that introducing the palm kernel shell and adsorbents in the coal briquette affect the water resistant and compressive strength. The highest water resistance and compressive strength were 5,165 second and 34 kg/cm2, respectively. The lowest SO2 level found in this study was 1 ppm for all Ca/S ratios, except for 1:1.
Kaji Eksperimental Pengaruh Fase Operasi Unit Tungku Garam Semi Modern Terhadap Prestasinya Mirza, Mirza; Khairil, Khairil; Maulana, M. Ilham
Jurnal Teknik Mesin Unsyiah Vol 4, No 1 (2016)
Publisher : Jurnal Teknik Mesin Unsyiah

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Abstract

Heating furnace which has been used by farmers to boil salt feed water is a traditional wood-fired furnance that is very simple and very inefficient. Researchers have made several modifications to the furnace unit multi-pot configuration that can utilize waste heat in order to improve the efficiency of the furnace. Potential waste heat of exhaust gas can be used as preheater. The methodology used to asses the performance on the furnace in water boiling test method operating condition of the cold start, hot start, and simmer. The data obtained then analyzed, the result showed that the burning rate and fire power that occurred during the cooking procces of the operation conditions of the cold start, hot start, and simmer increase, but the thermal efficiency decrease. This indicates that increasing of combustion efficiency has not been able to be utilized to the maximum heat. Value of the thermal efficiency of the furnace is affected by the value of useful energy to heat the water in the pot and the amount of energy entry/energy of combustion.