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All Journal JFA (Jurnal Fisika dan Aplikasinya)
Lila Yuwana Lila Yuwana
Department of Physics, Institut Teknologi Sepuluh Nopember, Kampus ITS-Sukolilo Surabaya
Physics

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Effects of The Addition of Carbon on Abaca Fiber and PVA Composite Materials Based on Mechanical and Acoustic Properties: Susilo Indrawati, Syabania R A, Linda Silvia, Lila Yuwana, Mochamad Zainuri Susilo Indrawati Susilo Indrawati; Syabania R. A. Syabania R. A.; Linda Silvia Linda Silvia; Lila Yuwana Lila Yuwana; Mochamad Zainuri Mochamad Zainuri
Jurnal Fisika dan Aplikasinya Vol 19 No 1 (2023): January 2023 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v19i1.14534

Abstract

Abaca is a kind of banana that grows in Indonesia. Abaca banana product utilized in this research is a fiber that obtained from the midrib of the stem. Henceforth, abaca fiber is processed to be the form of membranes. The purpose of the study are to determine the physical, mechanical and acoustic properties of abaca fiber composite materials as fillers and polyvinyl acetate (PVA) as a matrix. The ratio of composite materials of abaca fibers and PVA is 1:10. The variations used in producing membranes are the addition of carbon powders by 0%, 2%, 4%, 6% and 8%. The characteristics carried out include testing of density, morphology, tensile strength and sound absorption coefficient. The results reveal that the highest density is obtained from the sample of 0% carbon, i.e., 1.026 gr/cm3. Furthermore, the mechanical properties testing shows the highest yield stress value in samples with 4% carbon of 476.8 MPa and the highest Young modulus in samples with 8% carbon is 7905.1 MPa. Therefore, the addition of carbon could improve the mechanical properties of composites materials. Based on the measurement of sound absorption coefficient using an impedance tube with 1 microphone, the highest value can be attained from the sample of 4% carbon, namely 0.211 which shows the sample is more reflective. The material is reflective because the amount of abaca fiber used is less than PVA. The diameter of pores formed between the fiber and PVA are very small which could cause the absorption coefficient value to be lower. Therefore, further research will focus on the addition of abaca fiber content in composite materials. The positive point in this study is that the addition of carbon with 4% and 8% provides optimal mechanical ability.
Kemampuan Tempurung Kelapa Sebagai Panel Akustik Refuser (Resonator - Difuser) Dalam Menyerap dan Mengisolasi Bunyi: Susilo Indrawati, Suyatno, Lila Yuwana Susilo Indrawati Susilo Indrawati; Suyatno Suyatno; Lila Yuwana Lila Yuwana
Jurnal Fisika dan Aplikasinya Vol 15 No 2 (2019): June 2019 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v15i2.5244

Abstract

Echoes in auditorium could be improved by adding absorbent materials. The consequence of this is an emerge of various sound distribution. Therefore, this article performs the combination of two functions of a material, i.e as resonator and diffuser (known as refuser"). Coconut shells are cut into rectangles with a size of 3 cm x 3 cm, and given holes in the middle of about 1 mm and arranged into mosaic. Then, mosaic is combined with rockwool to be a refuser. The tests involve two types of measurements, i.e determining the value of the absorption coefficient () and noise reduction (NR). These test method uses the impedance tube method to determine the ability of the refuser to absorb and isolate the sound. The results shows that the addition of the mosaic (coconut shells) is able to double the value of to 0.64 at a frequency of 250 Hz. In other words, the refuser could behave as a resonator. Furthermore, the refuser is able to increases the NR value at frequencies above 1000 Hz (30-40 dB) and able to be used as absorber sound at low frequency (250 Hz) and in higher frequencies (>= 1000 Hz).
Teleportasi Kuantum Terkontrol Keadaan Dua-Qubit Sembarang: Agus Purwanto, Lila Yuwana, I Nengah Artawan, Bayu Dwi Hatmoko, Rafika Rahmawati, Achmad Fatih Alqodri Agus Purwanto Agus Purwanto; Lila Yuwana Lila Yuwana; I Nengah Artawan I Nengah Artawan; Bayu Dwi Hatmoko Bayu Dwi Hatmoko; Rafika Rahmawati Rafika Rahmawati; Achmad Fatih Alqodri Achmad Fatih Alqodri
Jurnal Fisika dan Aplikasinya Vol 15 No 1 (2019): January 2019 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v15i1.4649

Abstract

We have shown in detail a scheme of controlled quantum teleportation of arbitrary two-qubit state via the five-qubit channel which is 30 of 32 measurements of Alice and Charlie give unitary transformations of Bob in positive and negative pairs, the two others are free and different.
Co-Authors Achmad Fatih Alqodri Achmad Fatih Alqodri Agus Purwanto Agus Purwanto Bayu Dwi Hatmoko Bayu Dwi Hatmoko I Nengah Artawan I Nengah Artawan Linda Silvia Linda Silvia Mochamad Zainuri Mochamad Zainuri Rafika Rahmawati Rafika Rahmawati Susilo Indrawati Susilo Indrawati Suyatno Suyatno Syabania R. A. Syabania R. A.