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Konversi Termal kayu ketapang (Terminalia Catappal) Menjadi Bio-Oil Dengan Teknologi Pirolisis Menggunakan Katalis NiMo/NZA Sukma, Ari Aditia; Bahri, Syaiful; Aman, Aman
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 1 (2014): Wisuda Februari Tahun 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Availability of fossil fuels are depleting resulted in higher mining costs and selling prices to the public. In addition, the results of its combustion also releases GHG to the environment. One way to reduce the use of fossil fuels is produce bio-oil through pyrolysis technology. Ketapang rod is a huge potential used as feedstock for bio-oil production because its high cellulose content (41.80%). Synthesis of bio-oil from Ketapang stem begins with the process of size reduction of biomass and natural zeolite to -100+200 mesh size. Then, into the natural zeolite impregnated Ni and Mo to form the bimetallic catalyst NiMo/NZA. The catalyst is then activated through the stages of calcination, oxidation, and reduction. Pyrolysis process is done by varying the weight percentage of catalyst to biomass, ie: 1.5%, 2%, 2.5%, and 3% w/w. In addition, the catalytic pyrolysis process is carried 3% NZA only  and 3% NiMo/NZA were activated by calcination process alone. The highest yield was obtained on the use of catalysts NiMo/NZA perfect activated which amounted to 91.05%. From physics analysis performed on the bio-oil obtained: density of 0.91 g/ml, viscosity 10.839 cSt, acid number 46.954 mg NaOH/g sample, flash point 52oC, and the heating value 42.66 MJ/Kg. The figures are included in the range of physical characteristics of diesel-oil. Five (5) the dominant compound results of chemical analysis by GC-MS of the bio-oil from Ketapang rod by using a catalyst NiMo/NZA 3% by weight are: 3,4,4-trimethyl-2-nonene (10.29%), isobutylene (8.84%), 2,2-dimethyl-butane (8.05%), 3,4,4-trimethyl-2-pentene (5.76%), and 2-methyl-1-heptene (5.26%).  Keywords: Bio-oil, Pyrolysis, and Catalyst NiMo/NZA
Pemanfaatan Abu Terbang Batu Bara (Fly Ash) Sebagai Bahan Batako Yang Ramah Lingkungan L, Arif Hamidi; Aman, Aman; Drastinawati, Drastinawati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 1 (2014): Wisuda Februari Tahun 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

The use of coal as fuel in industry gives rise to waste such as fly ash and bottom ash. Fly ash has high content of silica and alumina thus can be potentially utilized as construction materials. Fly ash also contains heavy metals of 8.95 ppm Pb , 5.375 ppm Cu and 7.798 ppm Cr. Disposal of this waste in the ash lagoon or stacked inside the industrial area poses a problem for the environment. In this study, fly ash is utilized as raw material for making brick with cement composition to sand ratio 1:6 and replacement of sand by weight of fly ash with variation of 10 , 20 , 30 , 40 % . Compressive strength and leaching test were conducted after 28 days. The result of compressive strenght test showed that block with a variation of 0 % fly ash produces compressive strength of 115 kg/cm2 , 10 % of 155 kg/cm2 , 20 % of 120 kg/cm2 , 30 % of 120 kg/cm2 , 40 % at 95 kg/cm2. TCLP test results showed that most of the heavy metal content of Pb , Cu and Cr are immobilized so well that fly ash can be used as a mixture of brick that are safe for the environment.  Keyword  : fly ash, soldifikasi, batako
Pirolisis Limbah Pelepah Sawit Menjadi Bio Oil Menggunakan Ni.Mo/Lempung Cengar Samosir, Adelina; Bahri, Syaiful; Aman, Aman
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 2 (2014): Wisuda Oktober Tahun 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Fuel is a very important energy. The increase need fuel and diminishing avaibility of fossil fuel. It is also increasing awareness to find alternative energy technology. one of thesealternatives energy is bio-oil. bio-oil is a fuel, organic liquid produced by pyrolysis process. Pyrolysis of biomass a palm midrib. in a palm tree produces 40-50 midrib/tree/year so thatone hectare of palm can produce 6400 to 7500 midrib/year. manufacture of bio-oil with pyrolysis process can be done using Ni-Mo catalyst/Clay. This study aims to find the performance of the catalyst Ni-Mo/Clay Cengar (0%, 1%, 3% and 5% w / w biomass) against yeild bio-oil produced and characterize physical and chemical properties. pyrolysis palm midrib -40+60 mesh size of 50 grams, 0.5 grams of catalyst in 500 ml silinap performed at a temperature of 330 oC. The development Ni-Mo metal on clay cengar shown to affect the yield bio-oil is obtained, while the results obtained yield at 0%, 1%, 3% and 5%, respectively, 49.40%, 58.87%, 53.11% and 49.92%. bio-oil yield results that the maximum 58.87% obtained on treatment using a metal carrier Ni-Mo/clay cengar 1%. characterizationbiooil physical properties of of Ni-Mo/clay impurity 1% w/w has physical characteristics that density 0.9466 g/ml, 10.87 cSt viscosity, flash point 55C, and acid number 0.0751 g NaOH /g sample. based on the results of the analysis of the chemical components bio-oil is best obtained in the treatment bio-oil Ni-Mo/clay impurity 3% w/w bio-oil contains alcohol 7.35%, 0.35% phenol and other compounds 6.72% hydrocracking.Keyword : Bio-oil, a palm midrib, Pyrolysis, Ni.Mo/Clay Cengar
Social skill assessment for transvestives through the implementation of social problem solving method Aman, Aman
Journal of Social Studies (JSS) Vol 12, No 2 (2016): Journal of Social Studies (JSS)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jss.v12i2.11639

Abstract

This study is aimed to know: 1) how the steps of assessment instrumen building of social skill for transvestives through social problem solving method are, 2) instrument appropriateness of transvestives’ social skill assessment is. This study uses Research and Development method consisting of four stages, which are: (1) introduction stage, (2) design organizing stage of  social skill assessment instrument for transvestives as the development of initial product form, (3) trial, evaluation and revision stage, and (4) implementation stage.  The numbers of transvestives who become the sample in each trial in 2015 is 5 transvestives selected using purposive sampling. The data collection technique uses FGD, questionaire, observation, and documentation techniques. The data validation uses expert validation, while the accuracy of qualitative data uses source triangulation technique, theory and method. The quantitative data analysis is conducted using descriptive and qualitative data analytic technique with interactive model. Based on the research result, it is concluded as follow: 1) the steps of instrument building on social skill assessment for transvestives through the implementation of social problem solving model are through : a) introductory study to construct theoretical framework, b) plan and organize instrument through FGD and expert validation, c) limited trial or individual test, evaluation and revision of instrument. The guidelines of expert validation result instrument indicates average score as 3.89 which means that the guideline is good or appropriate to test. Also, based on the transvestivesassessment in individual trial indicates good result with average score of 3.69. Meanwhile, the character education model of Social Problem Solving (SPS) for transvestives as the effort to develop their social skill in Special Region of Yogyakarta indicates good result with average score of 3.80.
Effectiveness of social problem solving model in improving social skills of transvestites in the special regions Yogyakarta Aman, Aman; Sudrajat, Ajat; Yuliana, Lia
Journal of Social Studies (JSS) Vol 14, No 1 (2018): Journal of Social Studies (JSS)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jss.v14i1.21159

Abstract

This study aims to find out: the effectiveness of character education models in improving social skills for transvestites in Yogyakarta Special Region. This research uses Research and Development method which consists of four stages, namely: (1) preliminary stage, (2) the planning stage of character education models for transgender as the development of the initial product form, (3) the testing, evaluation and revision stages through practical learning improvement of social skills, and (4) implementation phase. The number of transsexuals who were sampled in the one-on-one trial in 2015 was 5 transvestites selected by purposive sampling. In the second year the trial was expanded to 1 management of Kebaya Shelter house and involved 22 transvestites. Whereas field operational trials were conducted on 32 transvestites in Kebaya and Iwayo. Data collection techniques use FGD techniques, questionnaires, interviews, observation, and documentation techniques. Data validity uses expert validation, while the validity of qualitative data with source triangulation techniques, theory and methods. Quantitative data analysis with descriptive analysis techniques and qualitative data with interactive models. The results showed that: Field operational trials of 32 transvestites, it can be seen that there was an increase in transvestites' social skills after training the character education model of SPS models for waria. The pretest results showed a good average classification with a mean of 3.20. While the posttest results indicate an increase to a good classification with a mean of 3.58. Based on these data shows that all aspects that are considered good regarding social skills show a good and good classification.  Keywords: Problem Solving, social skills, of transvestites
Peningkatan Kemampuan Menceritakan Pengalaman Pribadi Dengan Menggunakan Metode Latihan Terbimbing Siswa Kelas VI SD Inpres 2 Lemo Aman, Aman; Karim, Ali; Yunidar, Yunidar
Jurnal Kreatif Tadulako Online Vol 5, No 12 (2017): Jurnal Kreatif Tadulako Online
Publisher : Jurnal Kreatif Tadulako Online

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Abstract

Permasalahan yang dikaji dalam penelitian ini adalah apakah dengan menggunakan metode latihan terbimbing dapat meningkatkan kemampuan siswa VI SD Inpres 2 Lemo dalam menceritakan pengalaman pribadi. Tujuan Penelitian ini adalah Untuk meningkatkan kemampuan siswa kelas VI SD Inpres 2 Lemo dalam menceritakan pengalaman pribadi dengan metode latihan terbimbing. Metode yang digunakan adalah mengacu pada model Kurt Lewin yaitu dilaksanakan secara bersiklus. Penelitian ini bersifat deskriptif kuantitatif dan kualitatif, data kuantitatif diperoleh dari hasil evaluasi pembelajaran siswa sedangkan data kualitatif diperoleh dari kegiatan proses pembelajaran di kelas. Hasil yang diperoleh dalam penelitian ini menunjukkan bahwa pada siklus I siswa yang tuntas belajar sebanyak 8 orang dengan presentase ketuntasan klasikal mencapai 50 %. Belum terpenuhinya standar pembelajaran maka dilanjutkan Siklus II, pada siklus ini ketuntasan siswa lebih tinggi dibanding siklus I yaitu mencapai 96,15 % yaitu dengan jumlah siswa yang tuntas sebanyak 25 orang dari 26 orang siswa. Peningkatan kemampuan siswa dalam belajar didukung oleh penggunaan metode latihan terbimbing dengan baik sehingga dapat memotivasi dan menarik minat siswa dalam belajar. Berdasarkan hasil tersebut dapat dikatakan penggunaan metode latihan secara terbimbing dapat meningkatkan kemampuan siswa menceritakan pengalaman pribadi kelas VI SD Inpres 2 Lemo. Kata Kunci: Menceritakan, Pengalaman Pribadi dan Metode Latihan Terbimbing.
Implementation of Reading Guide Strategy in Global Climate Change Material for Enhancement of Student Learning Outcome Arozaq, Miftahul; Aman, Aman; Sunarhadi, M. Amin
International Journal of Active Learning Vol 2, No 2 (2017): October 2017
Publisher : International Journal of Active Learning

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (417.622 KB) | DOI: 10.15294/ijal.v2i2.10803

Abstract

The hierarchy of climate change learning concepts needs to be studied in schools. In the last four to five years, the issue of climate change has gained wider attention in the development of long-term government policy and programming so that it is necessary to integrate programs and action into learning materials in schools to mitigate the impact Global climate change. One of the learning strategies for integrating climate change into school materials through a reading guide. Reading guide is part of the application of active learning approach emphasizes the participation of higher learners so as to create a conducive learning atmosphere. Reading Guide aims to help students be more focused and easy to understand lessons delivered by teachers. The research objectives are; 1). How to study climate change material before using learning guide reading 2). What is the result of studying climate change materials after using learning guide reading. The research method is done by comparing the learning result of the students before and after using the learning of reading guide. As a testing group are students of class X IPS 2 in SMA Al-Islam 1 Surakarta a number of 36 students. The instrument used is a test, used to determine the effectiveness of learning reading guide consisting of 25 items. The result of this research is the result of study of climate change material before using the average reading guide learning is 41,22. After studying climate change materials using learning guide guidance, there is an increase of learning result to an average of 53.11. The conclusions obtained from this study indicate that learning using the reading guide is affective
Menghilangkan Kondisi Berdebu pada Area 541-AS1 Ramadan, Pariz; Sholeh, Moch.; Junaedi, Dedi; Aman, Aman
Seminar Nasional Teknik Mesin 2019: Prosiding Seminar Nasional Teknik Mesin 2019
Publisher : Politeknik Negeri Jakarta

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Abstract

Dalam menjaga kelancaran proses produksi HRC di perlukan adanya pengecekan dan perawatan alat secara berkala sehingga dapat menghilangkan atau meminimalisir terhentinya proses produksi yang di sebabkan oleh kerusakan alat. Salah satu alat yang harus di perhatikan adalah gate air slide 541-AS1 pada jalur bypass antara HRC utara dan HRC selatan yang selalu menimbulkan kondisi berdebu pada saat dilakukan perbaikan air slide. Kondisi berdebu yang terjadi pada gate 541-AS1 di sebabkan karena adanya celah pada gate, sehingga ketika dilakukan perbaikan pada alat 541-AS1 debu hasil proses HRC selatan masih bisa melewati celah gate pada jalur bypass kedua HRC tersebut. Apabila tidak dilakukan perbaikan pada gate tersebut, maka akan tercipta dua pilihan keadaan. Pertama, mengabaikan safety para pekerja yang sedang memperbaiki air slide karena bekerja pada area berdebu. Dan yang kedua, apabila pekerja ingin bekerja tanpa kondisi berdebu proses produksi HRC selatan juga harus di hentikan. Oleh karena itu di perlukan adanya modifikasi pada gate 541-AS1, yang mana gate semula tidak berfungsi optimal akan di modifikasi dengan membuat slide gate dan akan menggantikan gate yang sebelumnya.
MOOI INDIE Setyowati, Rini Riris; Aman, Aman
Jantra. Vol 14 No 1 (2019): Budaya Agraris
Publisher : Balai Pelestarian Nilai budaya Daerah Istimewa Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (193.934 KB) | DOI: 10.52829/jantra.v14i1.82

Abstract

The Mooi Indie has been considered as a painting style that was developing in Nusantara during the Colonial Government of Dutch Indies. The depiction of Nusantara’s beautiful scenery has become a implanted characteristic of the Mooi Indie painting until today. Mooi Indie was considered as the starting point of the development of modern painting. This literature study has revealed the following information. The artists through their works received appreciation because they had presented the natural beauty of the Dutch East Indies to the world. Appearing in the midst of the elite of Dutch colonial and the indigenous noblemen, Mooi Indie became the representation of grandeur, wealth, and the beauty of Nusantara. The objects of paint of Mooi Indie artists were farmer community and the beautiful natural sceneries of Dutch East Indies. In addition, practicing this genre they could also see the misery and concern of the community being portrayed. The results of this study show that Mooi Indie paintings were able to place beautiful mountains, rice fields, plants, and society into one frame. Another implied message is this painting genre was able to place the people’s agrarian culture in the proper composition. It is not surprising that Mooi Indie’s painting has become part of history as well as an evidence of the existence of an agrarian culture in Nusantara.
Kinerja Komposit Magnetik Graphene/Tio2/Fe3o4 Dalam Mendegradasi Fenol Dan Pemisahan Hasil Fotodegradasi Fenol Adharianti, Nia; Heltina, Desi; Aman, Aman
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 1 Januari s/d Juni 2020
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Titanium dioxide (TiO2) is the most widely used material in the photocatalysis process, one of which is to degrade phenol waste. The photocatalysis process can degrading waste compounds become more environmentally friendly compounds, namely CO2 and H2O. To increase the adsorption ability and photocatalysis process efficiency, titanium dioxide was added with carbon-based materials namely graphene. The addition of magnetic materials such as Fe3O4 is expected to facilitate the process of separating photocatalyst with magnetic fields. This research was aims to get graphene/TiO2/Fe3O4 composites for separation of phenol photodegradation results and characterizing graphene/TiO2/Fe3O4 composite. Procedure of this research started with the modification of graphene with cocoPAS surfactant, synthesis of Fe3O4, and synthesis of graphene/TiO2/Fe3O4 composite, performance test of composite using phenol and then magnetic separation test. Morphology of composite graphene/TiO2/Fe3O4 were characterized using SEM analysis. Concentration of phenol photodegradation results were analized using UV-Vis spectrophotometer. The synthesized graphene/TiO2/Fe3O4 composite is successfully in degrading phenol by 57,45 % with the magnetic separation test is 60 minutes.Keywords: photodegradation, magnetic composite, titanium dioxide, graphene, magnetite