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Sistem Monitor Tekanan Darah Arteri pada Lengan dengan Metode NMR (dalam Bentuk Model) (Halaman 9 s.d. 12) Bambang Murdaka Eka Jati; Kusminarto -; Agung Bambang Setio Utomo; Bambang Irawan
Jurnal Fisika Indonesia Vol 17, No 51 (2013)
Publisher : Department of Physics Universitas Gadjah Mada

Telah dilakukan penelitian yang bertujuan untuk membuat sebuah model alat pemantau tekanan darah arteri pada lengan manusia, dengan metode NMR. Penelitian dilakukan dengan menempatkan pipa plastik (berdiameter 0,5 cm) datar memanjang melewati rongga antara kedua kutub elektromagnet yang memberikan kuat medan magnet (150+-5)x10 gauss, dan juga berada di sepanjang koil RF. Disamping koil RF itu terdapat pula koil penerima. Saat itu, air mengalir di dalam pipa pada kelajuan (4+-1)10-1 m/s yang bersesuaian dengan tekanan 80 N/m2. Penelitian ini dilandasi oleh kenyataan bahwa 80% darah berupa air, dan molekul air mengandung atom hidrogen yang di dalam atomnya terdapat proton. Model ini dilandasi oleh kenyataan bahwa kelajuan alir darah di pembuluh arteri pada lengan (5+-1)x10-1 m/s, dan diameter pembuluh darahnya juga 0,4 cm. Penelitian ini berhasil memberikan informasi, bahwa aliran air di dalam pipa plastik pada kelajuan, tekanan, dan kuat medan magnet di atas mampu memberikan frekuensi resonansi NMR sebesar 5,5MHz, dan koil penerima memberikan GGL induksi di CRO sebesar 18 mV.

Sistem Monitor Tekanan Darah Arteri pada Lengan dengan Metode NMR (dalam Bentuk Model) (Halaman 9 s.d. 12) Bambang Murdaka Eka Jati; Kusminarto -; Agung Bambang Setio Utomo; Bambang Irawan
Jurnal Fisika Indonesia Vol 17, No 51 (2013)
Publisher : Department of Physics Universitas Gadjah Mada

Telah dilakukan penelitian yang bertujuan untuk membuat sebuah model alat pemantau tekanan darah arteri pada lengan manusia, dengan metode NMR. Penelitian dilakukan dengan menempatkan pipa plastik (berdiameter 0,5 cm) datar memanjang melewati rongga antara kedua kutub elektromagnet yang memberikan kuat medan magnet (150+-5)x10 gauss, dan juga berada di sepanjang koil RF. Disamping koil RF itu terdapat pula koil penerima. Saat itu, air mengalir di dalam pipa pada kelajuan (4+-1)10-1 m/s yang bersesuaian dengan tekanan 80 N/m2. Penelitian ini dilandasi oleh kenyataan bahwa 80% darah berupa air, dan molekul air mengandung atom hidrogen yang di dalam atomnya terdapat proton. Model ini dilandasi oleh kenyataan bahwa kelajuan alir darah di pembuluh arteri pada lengan (5+-1)x10-1 m/s, dan diameter pembuluh darahnya juga 0,4 cm. Penelitian ini berhasil memberikan informasi, bahwa aliran air di dalam pipa plastik pada kelajuan, tekanan, dan kuat medan magnet di atas mampu memberikan frekuensi resonansi NMR sebesar 5,5MHz, dan koil penerima memberikan GGL induksi di CRO sebesar 18 mV.

Analisis struktur morfologi membran kitosan/PEO dan kitosan/PEG4000 Kartika Sari; Sunardi Sunardi; Agung Bambang Setio Utomo; Edi Suharyadi; Evvy Kartini; Evi Yulianti
Jurnal Teras Fisika: Teori, Modeling, dan Aplikasi Fisika Vol 3 No 1 (2020): Jurnal Teras Fisika: Teori, Modeling, dan Aplikasi Fisika
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jtf.2020.3.1.2756

Pembuatan dan pengujian membran kitosan/PEO dan kitosan/PEG4000 dilakukan bertujuan untuk membandingkan struktur morfologi dan gugus fungsi yang dihasilkan dari membran kitosan/PEO dan kitosan/PEG4000. Pembuatan membran Kitosan/PEO dan kitosan/PEG4000 dilakukan dengan metode solution casting. Karakterisasi dilakukan menggunakan FTIR (Fourier Transform Infra Red) dan SEM (Scanning Electron Microscopy). Hasil FTIR membran kitosan, kitosan/PEO dan kitosan/PEG4000 menunjukkan adanya interaksi gugus fungsi –OH dan C-H di dalam membran kitosan/PEO dan kitosan/PEG4000. Bilangan gelomgang 1500 – 945 cm-1 terbentuk ikatan bending antara gugus fungsi C-C dan –NH3. Hasil SEM menunjukkan terbentuk agglomerasi dengan bertambahnya PEO dan PEG4000 pada larutan. Agglomerasi terjadi homogen di permukaan membran menunjukkan adanya pengaruh penambahan PEO dan PEG4000 pada pembentukan membran sehingga menghasilkan ikatan antar atom yang semakin renggang/tidak stabil. Hasil membran kitosan/PEO dan kitosan/PEG4000 dapat digunakan sebagai polimer elektrolit padat.

The Synthesized-Hydroxyapatite Powder from Anadara Granosa Shells using Deposition Time Method for Biomedical Applications Sunardi, Sunardi; A’yun, Nidha Aulia Qurrata; Dari, Qorinah Wulan; Aminuddin, Jamrud; Bilalodin, Bilalodin; Praktino, Budi; Yulianti, Evi; Utomo, Agung Bambang Setio; Sari, Kartika
Jurnal Ilmu Fisika Vol 16 No 1 (2024): March 2024
Publisher : Jurusan Fisika FMIPA Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.16.1.88-96.2024

Hydroxyapatite (HAp) powder, one of the biomaterials derived from natural sources, could be used in biomedical applications. In this research, the synthesized-HAp powder from Anadara Granosa shells as raw materials had a high calcium carbonate content with variations in deposition time using the precipitation method. Variations of deposition time used were 0 (S0), 24 (S24), and 48 (S48) hours. Fourier Transform Infrared (FTIR), X-Ray Diffractions (XRD), and Scanning Electron Microscopy (SEM) were used to investigate the chemical structure, phase analysis, and morphology of the synthesized HAp powder. FTIR results of the S0, S24, and S48 showed that the functional groups , and were formed at variations in the deposition time. The XRD results showed that the smallest of crystallite size of S48 was 26.03 nm, and the crystallinity degree of S24 was 38.74%. The grain dispersity of the synthesized-hydroxyapatite powder from SEM results were uniform, agglomeration, and spherical, irregular shape. The Ca, P, Mg, and Si compositions were shown in the synthesized-hydroxyapatite powder. The deposition time affects the synthesized-Hydroxyapatite (HAp) powder from the Anadara Granosa shell, and it is a potential raw material for biomedical applications.

Modification of Chitosan/PEG4000 dispersed with Lithium Triflate (LiCF\(_3\)SO\(_3\)) as a solid polymer electrolyte for the secondary battery Sari, Kartika; Haryadi, Arifin Nur Muhammad; Khusaenah, Nur; Sudaryanto; Yulianti, Evi; Utomo, Agung Bambang Setio
Communications in Science and Technology Vol 9 No 2 (2024)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.9.2.2024.1496

Secondary battery solid electrolytes attract researchers' attention for being one of the components of the anode and cathode separation in batteries. Currently, battery electrolytes on the market are liquid-based, which have weaknesses in their safety and are not environmentally friendly. Solid-based electrolytes can be a good choice since they excel in the safety and stability of mechanical and electrical properties; however, they still have the disadvantage of low conductivity values (~10-4 - 10-6 S/cm), thus requiring modification. The solid electrolytes modification using chitosan can be done by adding other polymers and salts as fillers and Li+ ion-making agents. This scientific paper offers an overview of the development of chitosan-based secondary battery solid electrolytes with the addition of PEG4000 polymer and LiCF3SO3. The study was conducted using the solution casting method producing solid electrolytes in the form of membranes. The addition of PEG4000 and LiCF3SO3 affected the microstructure and electrical permittivity of the polymer solid electrolyte membrane. PEG4000 as a plasticizer had no significant effect on inter- and intra-molecular bonds due to poor membrane homogeneity; meanwhile, LiCF3SO3 could increase the permittivity and ionic conductivity of the chitosan polymer solid electrolyte membrane to 3.199 x 10-7 S/cm. The chitosan polymer solid electrolyte membrane with the addition of PEG4000 and 30% LiCF3SO3 salt has an optimal value compared to other salt concentration variations. The results of this research concluded that LiCF3SO3 is evenly dispersed in the chitosan/PEG4000 solid polymer electrolyte membrane enabling it to be used as a secondary battery solid electrolyte.

Properties of Pineapple Leaf Fibers with Paper Waste as An Absorbing-Composite to Reduce Noise Sari, Kartika; Isnen, Yazid Zainur; Utomo, Agung Bambang Setio; Sunardi, Sunardi
Jurnal Ilmiah Pendidikan Fisika Al-Biruni Vol 11 No 2 (2022): Jurnal Ilmiah Pendidikan Fisika Al-Biruni
Publisher : Universitas Islam Negeri Raden Intan Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/jipfalbiruni.v11i2.12356

Natural product-based noise-absorbing composite can be an alternative to replace synthetic fiber because of its advantages of high strength, toughness, low price, and abundance to reduce noise. The materials used were pineapple leaf fibers with paper waste. This research aims to study the advantage of natural products to reduce noise by analyzing the coefficient of sound absorption and impact strength to evaluate the absorbing composite. The composites were tested with the Charpy method with ISO 11654 standard and ASTM E23 for sound absorption and impact strength. Sound absorption was carried out using an impedance tube at a frequency range of 250 – 3000 Hz. The volume fraction of pineapple leaf fibers, paper waste, and resin epoxy concentrations were 20% : 30% : 50%, 25% : 25% : 50%, and 30% : 20% : 50%. The thickness for the sound absorption coefficient was 2 cm and 3 cm, while the thickness of the impact strength was 0.5 cm. The highest sound absorption coefficient of pineapple leaf fibers composite for 30% : 20% : 50% volume fraction was 0.788 for sample 2 cm. The highest impact strength for 20% : 30% : 50% volume fraction of the thickness of 0.5 cm was 3.527 J/mm2. The results of the sound absorption coefficient will increase if used more pineapple leaf fibers but it will decrease the impact strength. Based on this research, the pineapple leaf fibers will improve the quality of the composite that can be used as a sound-absorbing material as well. These materials possess the promising potential to decrease waste and are used in industries for a low cost.

The Synthesized-Hydroxyapatite Powder from Anadara Granosa Shells using Deposition Time Method for Biomedical Applications Sunardi, Sunardi; A’yun, Nidha Aulia Qurrata; Dari, Qorinah Wulan; Aminuddin, Jamrud; Bilalodin, Bilalodin; Praktino, Budi; Yulianti, Evi; Utomo, Agung Bambang Setio; Sari, Kartika
Jurnal Ilmu Fisika Vol 16 No 1 (2024): March 2024
Publisher : Jurusan Fisika FMIPA Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.16.1.88-96.2024

Hydroxyapatite (HAp) powder, one of the biomaterials derived from natural sources, could be used in biomedical applications. In this research, the synthesized-HAp powder from Anadara Granosa shells as raw materials had a high calcium carbonate content with variations in deposition time using the precipitation method. Variations of deposition time used were 0 (S0), 24 (S24), and 48 (S48) hours. Fourier Transform Infrared (FTIR), X-Ray Diffractions (XRD), and Scanning Electron Microscopy (SEM) were used to investigate the chemical structure, phase analysis, and morphology of the synthesized HAp powder. FTIR results of the S0, S24, and S48 showed that the functional groups , and were formed at variations in the deposition time. The XRD results showed that the smallest of crystallite size of S48 was 26.03 nm, and the crystallinity degree of S24 was 38.74%. The grain dispersity of the synthesized-hydroxyapatite powder from SEM results were uniform, agglomeration, and spherical, irregular shape. The Ca, P, Mg, and Si compositions were shown in the synthesized-hydroxyapatite powder. The deposition time affects the synthesized-Hydroxyapatite (HAp) powder from the Anadara Granosa shell, and it is a potential raw material for biomedical applications.

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