Delina, Mutia
Program Studi Fisika Universitas Negeri Jakarta

Published : 3 Documents
Articles

Found 3 Documents
Search

The Development of High Order Thinking Skills (HOTS) Assessment Instrument for Temperature and Heat Learning Najihah, Aniq Rif’atun; Serevina, Vina; Delina, Mutia
Jurnal Penelitian & Pengembangan Pendidikan Fisika Vol 4 No 1 (2018): JPPPF (Jurnal Penelitian dan Pengembangan Pendidikan Fisika), Volume 4 Issue 1,
Publisher : Program Studi Pendidikan Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (335.919 KB) | DOI: 10.21009/1.04103

Abstract

Abstract The aim of this research is to develop the High Order Thinking Skills (HOTS) test instrument. The instrument was presented into a valid and reliable questionary to get information of the XI grade student's HOTS on temperature and heat. The research was done at Universitas Negeri Jakarta. The instrument has been trialed to 41 respondences on April 2018 at SMAN 1 Kabupaten Tangerang. The research was adapted from ADDIE approach which consists of Analyze, Design, Develop, Implement and Evaluate. The instrument consisted of 15 essays which the coefficient of reliability was 0.568, the difficulties and discrimination average were 0.817 and 0.363. Therefore the test instrument is proper to measure the student's HOTS.  
PEMBUATAN GRAFT TULANG DENGAN PROSES EKSTRAKSI SENYAWA HIDROKSIAPATIT DARI TULANG KORTEKS SAPI Anisah, Anisah; Delina, Mutia; Aisah, Nuning; Gustiono, Dwi
Spektra: Jurnal Fisika dan Aplikasinya Vol 3 No 1 (2018): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 3 Issue 1, April 2018
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (284.391 KB) | DOI: 10.21009/SPEKTRA.031.05

Abstract

Abstrak Pembuatan senyawa hidrosiapatit dari tulang kortek paha sapi dengan proses ekstraksi telah dilakukan. Penelitian ini bertujuan untuk menghilangkan senyawa organik pada tulang sehingga dapat digunakan sebagai bahan baku graft tulang. Metode yang digunakan adalah metode kimia dengan merendam tulang di dalam larutan Natrium Hidroksida (NaOH). Pengaruh variasi konsentrasi dan waktu perendaman NaOH terhadap proses ekstraksi tulang dikaji. Variasi konsentrasi larutan yang digunakan adalah 1M, 2M dan 3M dengan waktu perendaman 30 menit, 60 menit, dan 90 menit di dalam autoklaf bertekanan 1,5 atm dan temperatur 121°C. Hasil rendaman dianalisa dengan FTIR dan menunjukan adanya puncak gugus fungsi zat anorganik P-O, CO3 2- , dan O-H menyerupai kandungan tulang manusia. Sampel yang direndam pada larutan NaOH pada konsentrasi 1M dan 2M dengan waktu perendaman 30 menit masih ditemukan gugus fungsi C-H, yang mengindikasikan bahwa serbuk hidroksiapatit masih mengandung material organik sehingga beresiko pada reaksi penolakan oleh tubuh manusia saat diimplan. Namun demikian, serbuk hidroksiapatit yang dihasilkan dengan perendaman pada konsentrasi 3M dengan waktu 30 menit sudah tidak mengandung unsur organik, sehingga dapat digunakan sebagai bahan baku graft tulang. Kata-kata kunci: hidroksiapatit, kortek tulang sapi, Natrium Hidroksida, ekstraksi, graft tulang. Abstract The extraction of hydroxyapatite compounds from thigh bones cortex has been done. This research was aimed to remove the organic substances in the bones, so that it can be maintained as the raw material of a bone graft. The research employed a chemical method, the bone was soaked in the Natrium Hydroxide (NaOH) solution. The effect of various concentration and duration of bone's immersion in NaOH were also studied. The solution's various concentrations were 1M, 2M and 3M, therefore the various of immersion duration were 30 minutes, 60 minutes and 90 minutes in a 1.5 atm autoclave at a temperature of 121o C. The immersion results were studied throughout FTIR. The results showed that there were some peaks of the inorganic P-O, CO3 2-  and O-H substance function, correspond to a human bone characteristic.  Samples which were immersed in the 1M and 2M of NaOH solution with duration of 30 minutes have yet a C-H functional group. It indicated that the hydroxyapatite powders have yet organic substances, so there is still a risk of rejection by the human body when it is implanted. However, the sample which was immersed in 3M of NaOH solution with duration of 30 minutes has no any organic substances, it can be used as the raw material of a bone graft. Keywords: Hydroxyapatite, cow bone cortex, Natrium Hydroxide, extraction, bone graft
PENGARUH SUBSTITUSI ION Ti-Zn TERHADAP SIFAT KEMAGNETAN dan SIFAT PENYERAPAN GELOMBANG ELEKTROMAGNETIK MATERIAL SISTEM BaFe12-xTix/2Znx/2O19 Nenni, Nenni; Delina, Mutia; Adi, Wisnu Ari; Taryana, Yana
Spektra: Jurnal Fisika dan Aplikasinya Vol 2 No 2 (2017): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 2 Nomor 2, Agustus 2017
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (381.023 KB) | DOI: 10.21009/SPEKTRA.022.02

Abstract

Substitution of Ti+4 and Zn+2 ions on magnetic material BaFe12-xTix/2Znx/2O19 (x = 0 and 2) using the wet milling method has been performed. This research was conducted to get information the influence of Ti-Zn substitution on magnetic properties and its absorption. The magnetic material BaFe12-xTix/2Znx/2O19 is synthesized from a mixture of oxide materials, BaCO3, Fe2O3, TiO2 and ZnO. The mixture was milled for 5 hours, dried at 1000C then sintered at 10000C for 5 hours. The refinement result of the X-ray diffraction pattern shows that the sample has single phase BaFe12O19 with doping concentration of x = 0 and 2. The hysteresis curve shows that coercivity field value decreased in the sample with doping concentration of x = 2. The result of electromagnetic wave absorption shows that the substituted sample with Ti+4 and Zn+2 ions (doping concentration x = 2) has the highest absorption peak at a frequency of 11,2 GHz with reflection loss value (RL) of -24,3 dB. Electromagnetic wave absorption reaches 94% with sample thickness is about 1,0 mm. Therefore, the magnetic material BaFe12-xTix/2Znx/2O19 (x = 2) can be used for application of the electromagnetic wave absorber. Keywords: Substitution, BaFe12-xTix/2Znx/2O19, wet milling, reflection loss, electromagnetic wave absorber.