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All Journal Urania Jurnal Ilmiah Daur Bahan Bakar Nuklir Bulletin of Electrical Engineering and Informatics Kreano, Jurnal Matematika Kreatif-Inovatif Kontinu: Jurnal Penelitian Didaktik Matematika AlphaMath: Journal of Mathematics Education JIPMat (Jurnal Ilmiah Pendidikan Matematika) Educational Management Jurnal Mercumatika : Jurnal Penelitian Matematika dan Pendidikan Matematika Jurnal Obsesi: Jurnal Pendidikan Anak Usia Dini PRISMA Jurnal Riset Teknologi dan Inovasi Pendidikan (Jartika) Jurnal Cendekia : Jurnal Pendidikan Matematika Jurnal Basicedu Prima: Jurnal Pendidikan Matematika AGROTECH : JURNAL ILMIAH TEKNOLOGI PERTANIAN Journal Of Agritech Science (JASc) Unnes Journal of Mathematics Education Research Journal of Primary Education Journal of Authentic Research on Mathematics Eduacation (JARME) Jurnal Ilmiah Padma Sri Kreshna Journal of Research and Educational Research Evaluation Unnes Journal of Mathematics Education Unnes Journal of Mathematics Edukasia: Jurnal Pendidikan dan Pembelajaran Jurnal Basicedu Jurnal Pendidikan dan Pengabdian Masyarakat Bookchapter Pendidikan Universitas Negeri Semarang Proceeding of International Conference on Science, Education, and Technology Unnes Journal of Mathematics Education

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Jurusan Matematika FMIPA UNNES

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Agriculture, Biological Sciences & Forestry Arts Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Environmental Science Immunology & microbiology Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Social Sciences Other

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The ability of mathematical creative thinking viewed from student learning interest of class VIII in learning CPS contextual approach Masrukan, Masrukan; Parotua, Andar Jaya; Junaedi, Iwan
Unnes Journal of Mathematics Education Vol 8 No 1 (2019): Unnes Journal of Mathematics Education
Publisher : Department of Mathematics, Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ujme.v8i1.24745

The purpose of this study was to determine the effectiveness of Creative Problem Solving learning model with a contextual approach to students' mathematical and creative thinking ability. The population in this study were all students of class VIII SMP Mataram Semarang academic year 2017/2018 spreading in four classes. Sampling was done with selected random sampling technique and resulted class VIII-A as control group and VIII-C as experimental group. Data collection methods used were the test of creative thinking ability, the scale of interest in learning, observation and interview. Proportion test results obtained z_calculation = 2.77 then h_i was accepted, so it can be concluded the percentage of classical completeness. The t test results showed that the difference of two average obtained t_hitung = 8.63 and z_table = 1.68. Since t_calculation > t_table, it can be concluded that the mean of mathematical creative thinking abilities test of experimental class students who got CPS learning with contextual approach was more than the average of the data of mathematical creative thinking abilities tested in control group which achieved Discovery Learning. The proportion difference test resulted z_hitung = 5.67 and z_tabel = 1.64. Since z_count> z_tabel, the proportion of thorough students in the class using the CPS model with contextual cognition was greater than the proportion of students who completed the study in the classroom using the Discovery Learning model. From the result of difference test of average and proportion, it can be concluded that result of the test of the ability of mathematical creative thinking on students in experimental group which applied Creative Problem Solving learning with contextual approach was better than the control group which applied Discovery Learning. Based on the analysis, it can be known the implementation result of Creative Problem Solving learning model with an effective contextual approach in the delivery of material probability class VIII SMP Mataram Seamrang academic year 2017/2018. Students with a high learning interest had a high level of creative thinking ability. Students with fair interest in learning gained enough criterion. Meanwhile, students who had a low interest in learning had low level of creative thinking ability.

Mathematical representation ability viewed from the students' cognitive style in Two Stay Two Stray with product assessment Khairunnisa, Muthia; Masrukan, Masrukan
Unnes Journal of Mathematics Education Vol 9 No 2 (2020): Unnes Journal of Mathematics Education
Publisher : Department of Mathematics, Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ujme.v9i2.32224

The mathematical representation ability in Junior High School 1 Bojong is still not optimal. For this reason, one of the methods that can be used to increase the ability of mathematical representation is cooperative learning type Two Stay Two Stray with product assessment. This research aims to obtain the effectiveness of learning and analyze students' mathematical representation abilities in terms of the reflective-impulsive cognitive style. This research used Mixed Methods with Explanatory Sequential Design. The population in this study was all 8th graders of Junior High School 1 Bojong, while two classes were obtained as samples using cluster sampling techniques. For the qualitative analysis, four students were selected purposively. Data collection techniques used observation, documentation, tests, and interviews. The results showed that: (1) Two Stay Two Stray learning with product assessment is effective on the achievement of students' mathematical representation abilities, (2) subjects showed various mathematical representation ability.

Mathematical representation ability on geometry material viewed from interest for learning in jigsaw cooperative learning performance assessment Elmagustilla, Sheila Rosita; Masrukan, Masrukan
Unnes Journal of Mathematics Education Vol 10 No 2 (2021): Unnes Journal of Mathematics Education
Publisher : Department of Mathematics, Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ujme.v10i2.33660

This research aimed to test whether Jigsaw cooperative learning on geometry material with performance assessment achieve mastery learning, test whether the ability of the mathematical representation of students with Jigsaw cooperative learning on geometry material with the assessment of the performance is better than the ability of the representation of the students on the model of Discovery Learning, a description of the ability of the mathematical representation students on Jigsaw cooperative learning with the assessment of performance in terms of student interest. This study is mixed-methods research. The subjects were students of class VIII-A, one of Junior High School in Kaliwungu. The data collection method with tests, questionnaires and interviews. The results showed that: mathematical representation abilities of students who receive Jigsaw cooperative learning on geometry material with performance assessment fulfil the completeness of learning, mathematical representation abilities of students on geometry material in Jigsaw cooperative learning with performance assessments better than mathematical representation abilities of students on Discovery Learning, and descriptions of students' mathematical representation abilities in the Jigsaw cooperative learning with performance assessments in terms of students interest learning that students with high learning interest are able to fulfil indicators of mathematical representation ability is very well, students with learning interest are able to fulfil indicators of mathematical representation ability well and students with low learning interest are less able to fulfil the indicators of mathematical representation ability.

JENIS DAN LETAK KELEMAHAN KEMAMPUAN KOMUNIKASI DAN REPRESENTASI MATEMATIS GEOMETRI BAGI MAHASISWA CALON GURU Susilo, Bambang Eko; Masrukan, Masrukan; Sutarto, Hery; Safaatullah, Muh. Fajar
Bookchapter Pendidikan Universitas Negeri Semarang No. 8 (2024)
Publisher : Bookchapter Pendidikan Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.1529/kp.v1i8.198

Mahasiswa calon guru matematika dituntut untuk memiliki kemampuan komunikasi dan representasi matematis yang baik. Kemampuan tersebut sangat dibutuhkan agar pembelajaran yang kelak diselenggarakan dapat efektif bagi peserta didik. Dampak negatif pandemi Covid-19 secara nyata ditemukan pada kemampuan komunikasi dan representasi matematis mahasiswa calon guru yang pembelajarannya diselenggarakan secara daring maupun hybrid hampir selama dua tahun. Hal ini disebabkan karena keterbatasan praktik dalam komunikasi dan representasi, tidak terkecuali pada materi geometri. Melalui penyelidikan jenis dan letak kelemahan kemampuan komunikasi dan representasi matematis geometri mahasiswa calon guru diharapkan dapat ditentukan tindakan dan strategi perkuliahan yang tepat dalam usaha mengantisipasinya sehingga pembelajaran lebih efektif. Pembahasan terkait pentingnya kemampuan komunikasi dan representasi matematis geometri dan juga hasil identifikasi terkait jenis dan letak kelemahan kemampuan komunikasi dan representasi matematis geometri mahasiswa calon guru menjadi temuan yang dapat digunakan untuk referensi penyusunan strategi pembelajaran dengan tindakan yang tepat supaya pembelajaran efektif.

Pengembangan Tes Diagnostik Matematika Kurikulum Merdeka Triyono, Triyono; Masrukan, Masrukan; Mulyono, Mulyono
PRISMA Vol 12, No 2 (2023): PRISMA
Publisher : Universitas Suryakancana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35194/jp.v12i2.3250

Penelitian ini bertujuan untuk mendeskripsikan dan menganalisis pengembangan tes diagnostik pada kurikulum merdeka pada mata pelajaran Matematika yang layak bagi siswa kelas VII Sekolah Menengah Pertama. Metode penelitian menggunakan pendekatan Research and Depelovement. Prosedur pengembangan menggunakan lima tahap yaitu: tahap awal, design, development, implementation, dan evaluation. Subjek penelitian siswa kelas VII SMP Negeri 1 Kayen - Pati sebanyak 32 siswa. Objek penelitian ini adalah kelayakan tes diagnostik materi bilangan bulat. Sedangkan Analisis data menggunakan kualitatif deskriptif dan kuantitatif untuk menguji kevalidan, kepraktisan, dan keefektifan. Hasil Penelitian dan pembahasan disimpulkan bahwa pengembangan tes diagnostik sangat layak dan efektifÂ diterapkan pada kurikulum merdeka mata pelajaran matematika kelas VII SMP Negeri 1 Kayen - Pati. Terbukti dari hasil validasi konten atau materiÂ Â rata- rata nilai 3,25 dalam kategori sangat layak, dari validasi ahli bahwa keterampilan proses diperoleh nilai rata-rata 3,3 dalam kategori sangat layak, kemudian validasi ahli produkÂ diperoleh nilai rata-rata 4,0 dalam kategori sangat layak.

Literasi Matematika Berdasarkan Self Efficacy dengan Model Flipped Classroom Menggunakan Asesmen Dinamis Atho'illah, Ibnu; Kartono, Kartono; Masrukan, Masrukan
PRISMA Vol 11, No 1 (2022): PRISMA Volume 11, No 1 Tahun 2022
Publisher : Universitas Suryakancana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35194/jp.v11i1.2153

Menghadapi pembelajaran jarak jauh di masa pandemi covid-19 guru harus bisa menyesuaikan pembelajaran seefektif mungkin. Penelitian ini bertujuan untuk mengetahui literasi matematika siswa yang Berdasarkan self-efficacy dengan model pembelajaran flipped classroom berbantuan asesmen dinamis. Metode dalam penelitian ini menggunakan mix method dengan menggunakan design embedded concurrent. Subjek penelitian adalah enam siswa di salah satu SMP yang berada di Kutai Timur Kalimantan Timur. Validasi instrumen dinilai oleh dosen ahli literasi matematika dan asesmen dinamis, beserta guru. Instrumen penelitian berupa lembar validasi materi, beserta angket uji coba penelitian. Hasil penelitian menunjukkan bahwa pembelajaran literasi matematika siswa dengan model pembelajaran flipped classroom berbantuan asesmen dinamis lebih baik dari pada siswa dengan model pembelajaran problem based learning dengan pemanfaatan teknologi. Self efficacy sangat berpengaruh terhadap literasi matematika sangat signifikan begitu pula pengelompokan self efficacy tinggi, self efficacy sedang dan self efficacy rendah sangat berpengaruh terhadap literasi matematika siswa.

PENGARUH PROSES SINTERING TERHADAP PERUBAHAN DENSITAS, KEKERASAN DAN MIKROSTRUKTUR PELET U-ZrHx Masrukan, Masrukan; Mujinem, Mujinem
Urania : Jurnal Ilmiah Daur Bahan Bakar Nuklir Vol 22, No 1 (2016): Februari 2016
Publisher : website

ABSTRAKPENGARUH PROSES SINTERING TERHADAP PERUBAHAN DENSITAS, KEKERASAN DAN MIKROSTRUKTUR PELET U-ZrHx. Proses sintering pelet bahan bakar U-ZrHx dilakukan untuk memperoleh densitas yang lebih tinggi dari pelet sebelum disinter. Mula-mula dibuat pelet U-ZrHx dari kandungan Zr berturut-turut sebesar 35%, 45% dan 55% berat. Proses sintering dilakukan selama 1 jam pada temperatur yang bervariasi 1100 °C, 1200 °C dan 1300 °C dengan laju kenaikan temperaur 2 °C/menit, kemudian diturunkan temperaturnya dengan laju penurunan temperatur 10 °C/menit hingga temperatur kamar. Pelet U-ZrHx yang telah disinter selanjutnya dikenai berbagai pengujian, antara lain dimensi, densitas, kekerasan, dan mikrostruktur. Pada pengujian densitas terlihat bahwa pada komposisi Zr yang sama tetapi temperatur sintering yang semakin tinggi maka terjadi kenaikan nilai densitas. Apabila dilihat pada temperatur sintering yang sama dan kandungan Zr yang semakin tinggi maka densitas yang diperoleh semakin rendah. Hasil pengujian kekerasan mikro menunjukkan bahwa pada komposisi tetap Zr sebesar 35% dan 55% yang disinter pada temperatur sintering yang semakin tinggi maka semakin tinggi kekerasannya, kemudian menurun bila temperatur sintering naik. Apabila dilihat hasil pengujian pada temperatur sintering tetap tetapi kandungan Zr berbeda maka terlihat dari kandungan Zr 35% (U-35ZrHx) menjadi 45% (U-45ZrHx) terjadi kenaikan kekerasan, dan akan menurun pada kenaikan kandungan Zr menjadi 55% (U-55ZrHx). Sementara itu, dari hasil pemeriksaan mikrostruktur menunjukkan bahwa pada kompsisi Zr tetap tetapi temperatur sintering semakin tinggi, maka jarak antar serbuk semakin rapat. Apabila dilihat dari temperatur sintering tetap tetapi komposisi Zr yang semakin tinggi, maka terlihat bahwa semakin tinggi komposisi Zr semakin berkurang kerapatan jarak antar serbuk di dalam pelet. Dapat disimpulkan bahwa proses sintering pelet akan menaikkan densitas, kekerasan, dan kerapatan jarak antar serbuk. Kondisi optimum dicapai pada proses sintering pelet dengan komposisi Zr 45% (U-45ZrHx) yang disinter pada temperatur 1200 °C. Pada kondisi tersebut pelet sinter mempunyai densitas sebesar 8,673g/cm3, kekerasan sebesar 661 HVN tanpa mengalami keretakan.Kata kunci: Sintering, densitas, kekerasan, mikrostruktur, pelet U-ZrHx. ABSTRACTEFFECT OF SINTERING PROCESS TO CHANGES IN, DENSITY , HARDNESS, AND MICROSTRUCTURE OF U – ZrHx PELET. The process of sintering fuel pellets U-ZrHx performed to obtain a higher density compared pellets before sintered. At first, U-ZrHx pellets made from the content of Zr respectively 35%, 45% and 55% by weight. Sintering process is carried out for 1 hour at varying temperature 1100°C, 1200°C and 1300°C with an increase rate of 2°C temperatur/ min, then lowered the temperature at a rate of decrease in temperature of 10°C / min until room temperature. U-ZrHx pellets that have been sintered subsequently subjected to various tests, such as: the dimensions, density, hardness, and microstructure. In testing the density, it appears that at the same Zr composition but the sintering temperature is higher then an increase in the density. When seen in the same sintering temperature and Zr content is higher then the lower the density obtained. Micro hardness testing results show that the composition Zr 35% fixed and 55% were sintered at the sintering temperature is higher, have the higher the hardness, and then decreases as the sintering temperature increase. If the test results viewed in the sintering temperature fixed but the content of Zr is different, it can be seen from the content of Zr 35% (U-35ZrHx) to 45% (U-45ZrHx) an increase in hardness, and will decrease to an increase in the content of Zr to 55% (U- 55ZrHx). Meanwhile, the results of the microstructure observation of the pellets can be seen that at composition Zr fixed but the sintering temperature is higher, then the distance between the powder / porosity increasingly dense. When viewed from the sintering temperature fixed but the composition increasingly higher Zr it is seen that higher Zr composition, the density between the powder in the pellets decreased. It can be concluded that the sintering process the pellets will increase density, hardness, and distance between powder increasingly dense. The optimum condition is achieved at sintering process the pellets with a composition of 45% Zr (U-45ZrHx) sintered at temperatures of 1200°C. In these conditions the sintered the pellets has a density of 8.673 g / cm3, hardness of 661 HVN without developing cracks.Keywords: Sintering, density, hardness, microstructure, U-ZrHx pellet.

KORELASI KOMPOSISI UNSUR TERHADAP SIFAT TERMAL SERBUK BAHAN BAKAR U-ZrHX Masrukan, Masrukan; Alhasa, M Husna; Yanlinastuti, Yanlinastuti
Urania : Jurnal Ilmiah Daur Bahan Bakar Nuklir Vol 22, No 2 (2016): Juni 2016
Publisher : website

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/urania.2016.22.2.3090

ABSTRAKKORELASI KOMPOSISI UNSUR TERHADAP SIFAT TERMAL SERBUK BAHAN BAKAR U-ZrHx. Telah dilakukan analisis untuk menentukan korelasi komposisi terhadap sifat termal pada serbuk bahan bakar U-ZrHx. Serbuk U-ZrHx dibuat dari proses hidriding ingot U-Zr, dimana ingot U-Zr merupakan hasil peleburan logam U dan Zr. Dalam percobaan ini dibuat tiga variasi serbuk yaitu U-35ZrHx, U-45ZrHx, dan U-55ZrHx. Perlunya dilakukan penentuan kadar Zr terhadap sifat termal adalah untuk mengetahui pengaruh kadar Zr terhadap sifat transformasi panas dari bahan bakar tersebut. Mula –mula dilebur logam U dan Zr didalam tungku peleburan busur listrik hingga menghasilkan ingot U-Zr. Ingot U-Zr selanjutnya dibuat serbuk dengan teknik hidridring-milling hingga menghasilkan serbuk U-Zr. Serbuk U-Zr dianalisis komposisi dengan menggunakan teknik sepektroskopi serapan atom (SAA) dan sepektroskopi UV-Vis. Hasil analisis komposisi menunjukkan bahwa pada analisis untuk menentukan kandungan U dan Zr hampir semua sampel uji yang dianalisis mempunyai perbedaan yang cukup besar antara kandungan U dan Zr yang ditentukan dengan hasil analisis U dan Zr terkecuali hasil analisis pada serbuk U-45Zr yang hanya berbeda 0,609 %. Dari hasil pengujian unsur pengotor diperoleh bahwa semua unsur pengotor yang ada masih memenuhi persyaratan untuk bahan. Pengujian kapasitas panas yang dilakukan pada rentang temperatur 35ºC hingga 437ºC memperlihatkan bahwa nilai kapasitas yang paling besar adalah serbuk U-35ZrHx dengan nilai kapasitas panas sebesar 0,13 J/g.oC. Sementara itu dari pengujian transisi perubahan fasa diperoleh bahwa pada U-45ZrHx mengalami dua tahapan reaksi disertai perubahan fasa. Dapat disimpulkan apabila dilihat dari kandungan U dan Zr belum bisa digunakan untuk bahan bakar, sedangkan dari analisis kandungan unsur pengotor diperoleh bahwa semua unsur yang ada masih memenuhi persyaratan untuk bahan bakar kecuali unsur Fe. Sementara itu hasil analisis sifat termal yaitu kapasitas panas diperoleh nilai kapasitas panas tertinggi pada serbuk U-35ZrHx, sedangkan dari pengujian transisi perubahan fasa diperoleh bahwa pada U-45ZrHx mengalami dua tahapan reaksi disertai perubahan fasa. Terdapat pengaruh komposisi terhadap sifat termalnya, dimana semakin tinggi kandungan Zr maka nilai kapaistas panas hidrida uranium zirkonium semakin rendah.Kata kunci: komposisi, sifat termal, bahan bakar, U-ZrHx. ABSTRACTCOMPOSITION CORRECTION ON THE THERMAL PROPERTIES OF U-ZrHX FUEL POWDERS. Analysis has been conducted to determine the composition correlation on the thermal properties of the powder fuel U-ZrHx. U-ZrHx powder made from the process hidriding U-Zr ingot, where the ingot is the result of U-Zr and Zr U metal melting. In this experiment made three variations of powders, namely U-35ZrHx, U-45ZrHx, and U-55ZrHx. Need for determination of the thermal properties of Zr was to determine the effect of the nature of the transformation of Zr levels of heat from the fuel. At first, U and Zr metal is melted in electric arc furnaces to produce ingot U-Zr. U-Zr ingot then made powder with hidridring-milling techniques to produce U-Zr powder. U-Zr powder composition analyzed using techniques sepectroscopy atomic absorption (AAS) and UV-Vis spectroscopy. The results of composition analysis showed that the analysis to determine the content of U and Zr nearly all the test samples analyzed have quite a big difference between the content of U and Zr as determined by the results of the analysis of U and Zr exception analysis result in powder U-45Zr which differ only 0.609%. From the analysis of impurities obtained that nearly all the impurities that exist still meet the requirements for fuel unless the elements Fe, where elements of the existing Fe amounted to 382.912 g/g while the requirement of £ 250 mg /µg. Testing conducted heat capacity in the temperature range 35 ° C to 437 ° C showed that the capacity were greatest powder 35ZrHx U-with a value heat capacity of 0.13 J / g.oC. Meanwhile, test results obtained transition phase change that the U-45ZrHx undergo two stages of reaction with phase change. It can be concluded when seen from the content of U and Zr can not be used for fuel, while the analysis of the content of impurities found that all the elements that are still eligible for the fuel unless the element Fe. For the analysis of the thermal properties are the heat capacity of the heat capacity of the highest values obtained in powder U-35ZrHx, while the transition from the testing phase changes shows that the U-45ZrHx undergo two stages of reaction with phase change. There is an effect of the composition on the thermal properties, where the higher the content of Zr, the value of uranium zirconium hydride heat capacity is lower.Keywords: composition, thermal properties, fuels, U-ZrHx.

PERBANDINGAN DENSITAS PELET UO2 HASIL PELETISASI MENGGUNAKAN SERBUK DAN MIKROSPIR Mutiara, Etty; Rachmawati, Meniek; Masrukan, Masrukan
Urania : Jurnal Ilmiah Daur Bahan Bakar Nuklir Vol 22, No 1 (2016): Februari 2016
Publisher : website

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/urania.2016.22.1.2743

ABSTRAKPERBANDINGAN DENSITAS PELET UO2 HASIL PELETISASI MENGGUNAKAN SERBUK DAN MIKROSPIR UO2. Telah dilakukan pengembangan proses peletisasi menggunakan mikrospir UO2sebagai pengganti serbuk UO2. Mikrospir bersifat speris, free flowing, porus dengan kekerasan tertentu (soft particle). Keunggulan penggunaan mikrospir pada proses peletisasi adalah tidak menimbulkan debu saat kompaksi dan lebih efektif dalam pengepakan sehingga tidak membutuhkan proses granulasi dan pelumas padat. Dihipotesakan bahwa penggunaan mikrospir UO2 dalam proses peletisasi akan memberikan densitas pelet sinter yang lebih tinggi dibandingkan dengan penggunaan serbuk UO2 pada parameter proses peletisasi yang sama. Mikrospir UO2yang digunakan pada peletisasi ini berukuran 900 µm dan crushing strength 2,0 N/partikel , sedangkan serbuk UO2 yang digunakan berukuran antara 150-850 µm. Proses peletisasi mikrospir UO2 dan serbuk UO2 dilakukan dengan memvariasikan tekanan kompaksi antara 200 Mpa hingga 500 MPa dan disinter pada temperatur 1100 °C selama 6 jam dalam suasana campuran gas hidrogen dan nitrogen. Karakterisasi dilakukan pada pelet mentah dan pelet sinter mikrospir UO2 dan serbuk UO2 yang meliputi pengukuran dimensi, penimbangan berat dan pengukuran densitas. Pada variasi tekanan kompaksi diperoleh pelet mentah dan pelet sinter mikrospir UO2 dengan densitas lebih tinggi dibandingkan hasil peletisasi serbuk UO2. Diperoleh hasil bahwa densitas pelet mentah baik hasil kompaksi serbuk UO2 maupun mikrospir UO2meningkat dengan bertambahnya tekanan kompaksi. Densitas pelet mentah mikrospir UO2berkisar antara 82,1 - 84,2 %TD. Pada kondisi penyinteran yang sama, baik kompakan serbuk UO2 maupun kompakan mikrospir UO2 memperlihatkan densitas meningkat dengan semakin besar tekanan proses kompaksi. Dari penelitian ini belum diperoleh pelet sinter UO2 dengan densitas sesuai persyaratan reaktor pengguna sehingga diperlukan penelitian lanjutan terkait parameter proses peletisasi dan spesifikasi mikrospir UO2yang efektif dalam memberikan pelet sinter UO2 dengan densitas sesuai persyaratan. Kata kunci: peletisasi, UO2, mikrospir, serbuk, densitas. ABSTRACTA COMPARISON OF PELLETS DENSITIES IN PELLETIZATION PROCESS USING UO2 POWDER AND UO2MICROSPHERE. A pelletization process UO2 fuel has been developed using UO2 microsphere as a substitute of UO2 powder. Microspheres are spherical, free flowing and porous with certain hardness (soft particle). The benefit of using microsphere in pelletization process is dust free in compaction and more effective in packing so the granulation process and solid lubricants are not required. It is hypothesized that the use of UO2 microsphere in the pelletization process will provide higher sintered pellet density than UO2 powder at the same pelletization process parameters. UO2 microsphere size used in this pelletization was 900 μm with crushing strength of 2.0 N / particles while the UO2 powder size between 150 and 850 μm. The pelletization processes of UO2 microsphere and UO2 powder were performed by varying the compacting pressure between 200Mpa up to 500MPa and sintered at temperatures of 1100 °C for 6 hours in an atmosphere of hydrogen and nitrogen gas mixture. Characterizations performed on the green and sintered pellets of UO2 microsphere and UO2 powder were dimension measurements, weighing and densities measurements. The densities of green and sintered pellets of UO2 microsphere were higher than the green and sintered pellets densities of UO2 powder with corresponded compaction pressure variations. The results indicate that the density of the green pellets both compaction results UO2 powder and UO2 mikrospir increased with increasing compacting pressure. Mikrospir UO2 pellets density crude ranged from 82.1 to 84.2% TD. At the same sintering conditions, both Compaction UO2 powder and UO2 mikrospir Compaction shows the density increases with the greater pressure compacting process. The sintered pellets densties of UO2 obtained from this research were not appropriate with density requirements of PWR fuel. It is necessary to perform advanced research related to the effective pelletization process parameters and UO2 microsphere specifications in providing the appropriate sintered pellets densities.Keywords: pelletization, UO2microsphere, powder, density

PHASE CHANGES ON 4H AND 6H SIC AT HIGH TEMPERATURE OXIDATION Setiawan, Jan; Suryaman, Ganisa K; Masrukan, Masrukan
Urania : Jurnal Ilmiah Daur Bahan Bakar Nuklir Vol 22, No 2 (2016): Juni 2016
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ABSTRACTPHASE CHANGES ON 4H AND 6H SIC AT HIGH TEMPERATURE OXIDATION. The oxidation on two silicon carbide contain 6H phase and contains 6H and 4H phases has been done. Silicon carbide is ceramic non-oxide with excellent properties that potentially used in industry. Silicon carbide is used in nuclear industry as structure material that developed as light water reactor (LWR) fuel cladding and as a coating layer in the high temperature gas-cooled reactor (HTGR) fuel. In this study silicon carbide oxidation simulation take place in case the accident in primary cooling pipe is ruptured. Sample silicon carbide made of powder that pressed into pellet with diameter 12.7 mm and thickness 1.0 mm, then oxidized at temperature 1000 oC, 1200 oC dan 1400 oC for 1 hour. The samples were weighted before and after oxidized. X-ray diffraction con-ducted to the samples using Panalytical Empyrean diffractometer with Cu as X-ray source. Diffraction pattern analysis has been done using General Structure Analysis System (GSAS) software. This software was resulting the lattice parameter changes and content of SiC phases. The result showed all of the oxidation samples undergoes weight gain. The 6S samples showed the highest weight change at oxidation temperature 1200 oC, for the 46S samples showed increasing tendency with the oxidation temperature. X-ray diffraction pattern analysis showed the 6S samples contain dominan phase 6H-SiC that matched to ICSD 98-001-5325 card. Diffraction pattern on 6S showed lattice parameter, composition and crystallite size changes. Lattice parameters changes had smaller tendency from the model and before oxidation. However, the lowest silicon carbide composition or the highest converted into other phases up to 66.85 %, occurred at oxidation temperature 1200 oC. The 46S samples contains two polytypes silicon car-bide. The 6H-SiC phases matched by ICSD 98-016-4972 card and 4H-SiC phase matched by ICSD 98-016-4971 card. Diffraction pattern on 46S also showed lattice parameter, composition and crystallite size changes. The lattice parameter changes not significant. For 6S and 46S sam-ples at 1400 oC, the 6H-SiC phase changes into other phases more than 50 % from its original weight percentage.Keywords: silicon carbide, 4H-SiC, 6H-SiC, oxidation, high temperature. ABSTRAKPERUBAHAN FASA 4H DAN 6H SIC YANG TEROKSIDASI PADA TEMPERATUR TINGGI. Telah dilakukan proses oksidasi pada silikon karbida yang mengadung fasa 6H dan silikon karbida yang mengandung fasa 4H dan 6H. Silikon karbida merupakan keramik non oksida dengan sifat-sifat unggulnya yang sangat potensial digunakan dalam dunia industri. Dalam industri nuklir silikon karbida digunakan sebagai bahan struktur kelongsong pada bahan bakar reaktor air ringan light water reactor (LWR) dan sebagai pelapis pada kernel bahan bakar reaktor gas temperatur tinggi (RGTT). Pada studi ini dilakukan simulasi oksidasi silikon karbida pada kernel apabila terjadi kegagalan pada pipa pendingin utamanya. Sampel dibentuk dari serbuk silikon karbida yang di pres hingga berbentuk pelet dengan diameter 12,7 mm dan ketebalan 1.0 mm kemudian dioksidasi pada temperatur 1000 oC, 1200 oC dan 1400 oC selama 1 jam. Sampel sebelum dan setelah dioksidasi dilakukan penimbangan dan pengujian difraksi sinar-X menggunakan Difraktometer Panalytical Empyrean dengan Cu sebagai sumber sinar-X. Analisis pola difraksi dilakukan menggunakan aplikasi General Structure Analysis System (GSAS), dengan hasil yang diperoleh adalah perubahan parameter kisi dan kandungan fasa SiC-nya. Hasil percobaan menunjukkan bahwa semua sampel yang teroksidasi mengalami peningkatan berat. Oksidasi sampel 6S menyebabkan kenaikan berat tertinggi pada temperatur 1200 oC, sedangkan sampel 46S memiliki berat dengan kecenderungan meningkat seiring dengan meningkatnya temperatur oksidasi. Analisis pola difraksi sinar-X menunjukkan bahwa fasa domi-nan yang terbentuk pada sampel 6S adalah fasa 6H-SiC yang didekati dengan model dari kartu ICSD 98-001-5325. Pola difraksi sampel 6S menunjukkan adanya perubahan parameter kisi, perubahan komposisi dan perubahan ukuran kristalitnya. Perubahan panjang kisi memiliki kencenderungan berkurang dari nilai model dan sebelum dioksidasi, sedangkan komposisi silikon karbida paling rendah atau yang paling banyak terkonversi menjadi fasa lain mencapai 66.85 %, yang terjadi pada temperatur oksidasi 1200 oC. Sampel 46S mengandung fasa 4H-SiC dan 6H-SiC. Fasa 6H-SiC didekati dengan model dari kartu ICSD 98-016-4972 dan fasa 4H-SiC didekati dengan model dari kartu ICSD 98-016-4971. Pola difraksi sampel 46S menunjukkan adanya perubahan parameter kisi, perubahan komposisi dan perubahan ukuran kristalitnya. Perubahan panjang kisi pada sampel 46S tidak terlalu signifikan. Fasa 6H-SiC pada sampel 6S dan 46S dengan temperatur oksidasi 1400 oC mengalami perubahan menjadi fasa oksida dan lainnya sebesar lebih dari 50 % persen berat awalnya.Kata kunci: silikon karbida, 4H-SiC, 6H-SiC, oksidasi, temperatur tinggi.

Co-Authors Abdul Ghofur Achmad Buchori Afryany, Laylya Agung Ramadan, Yoshida Agus Wahyudin Aida, Siti Akhmad Fauzi Alhasa, M Husna Amalia Fikri Utami Aminuyati Ani Rusilowati Ardhi Prabowo Arief Agoestanto Arif Hidayad Arivina, Aulia Nur Ary Woro Kurniasih Asih, Tri Sri Noor Astatik, Reni Panca Andri Atho'illah, Ibnu Azizia, Ananda Jullailatul Azka, Maulida Zammalatul Bambang Eko Susilo Bayquni, Bayquni Budi Waluya, Stevanus Darmawan, Eman Dewi, Nuriana Rachmani Dewi, Nuriana Rachmani Djoko Widodo Djuniadi Djuniadi Dwi Biyantoro Dwi Hermanto Dwi Purwaningsih, Dwi Dwijanto Dwijanto, Dwijanto Eko Adinuryadin, Eko Eko Pujianto Elmagustilla, Sheila Rosita Ely Susanti Ema Butsi Prihastari Ratna Widyaningrum, Ema Butsi Prihastari Endang Werdiningsih, Endang Etty Mutiara Fakhruddin, Fakhruddin Farida Hidayati Fattayati, Fattayati Fauziah Asri Latifah, Fauziah Asri Gaol, Paltiman Lumban Gorotomole, MM. Alamin Hadijaya Hadijaya Halim, Mansyur Ali Haqiqi, Muhamad Irwan Hendriani, Batul Fatin Hery Sutarto Huda, Alimul Hutagaol, Antonio Gogo Isnarto, Isnarto Isti Hidayah Isyuniarto Isyuniarto Iwan junaedi Jan Setiawan Kartika Yuni Purwanti Kartono - Kartono, Kartono Kasir Santoso Widodo, Kasir Santoso Khairunnisa, Muthia Khoir, Nisaul Lathifatul Lintang, Anggit Cahya Lisa Virdinarti Putra Marfu'ah, Solikhatun Marwazi, Muhammad Mawarti, Sela Maya Kusuma, Sarli Bamoris Meniek Rachmawati Mohammad Asikin Muchammad Imron Muhammad Khumaedi Mulyono Mulyono Munawaroh, Siti Badriatul Nereroan, Yuliana Nining Setyowati Noor, Hanif Juhar Nurkaromah Dwidayati, Nurkaromah Pamungkas, Mieko Taqwa Parotua, Andar Jaya Pranawestu, Aditya Prasetyo, Kakung Pratiwi, Mayasari Dian Puji Handayani Puspitasari, Anis Widi Putra, Ngurah Made Darma Putranto, Dwi Putriaji Hendikawati Rahayu, Yenrika Kurniati Rifqiyana, Lilyan Rina Dwi Setyawati Risdianti, Ana Rivo Panji Yudha Riza Arifudin Rochmad - Rosika Kriswarini Rukmi, Kuntjahjawati Susilo Adi S. B. Waluya, S. B. Sa'adah, Daroinis Safaatullah, Muh. Fajar Samsudi . Santika Lya Diah Pramesti Saputro, Didik Adi SAR, Kuntjahjawati Scolastika Mariani Sefiany, Nadia Sholikati, Sholikati Sigit Gunawan Slamet Hariyadi Sri Murwati, Sri SRI WARDANI Sri Wijayanti St. Budi Waluya Sugiyo Sugiyo, Sugiyo Sugiyono Sugiyono Sukamto Sukamto Sukestiyarno Sukestiyarno Sulhadi - Sunawan Sunawan Sungkono Sungkono Suprihatini, Noerhidayah Suprihatini, Noerhidayah Suryaman, Ganisa K Suryati Suryati Taulia Damayanti Tolang, Korsini Heru Setiawan Triyono Triyono Umar Santoso Usman Sudjadi Vembriliya, Zelmy Adista Wahyu Hardyanto Wahyu Lestari Walid Walid, Walid Wardono Wardono Wesna, Merry Wiwi Isnaeni Wiyanto - Wuryanto Wuryanto Yanlinastuti Yanlinastuti Yumaroh, Yumaroh Yunus, Muhamad Yasin Zaenuri Mastur Zubaedi, Muhammad Fakqih

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