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BULETIN FISIKA
Published by Universitas Udayana
ISSN : 14114690     EISSN : 25809733     DOI : https://doi.org/10.24843/BF
Core Subject : Health, Science,
Astronomy Energy Materials Science & Nanotechnology Medicine & Pharmacology Physics
Aims and Scope Aims The Journal aims to promote the theory and application in the field of physics and to encourage a vigorous dialogue among scholars and researchers worldwide. It presents original research articles, letters, and review articles, and publishes the latest achievements and developments in physics and related fields. All contributions shall be rigorously refereed and selected based on the quality and originality of the work as well as the breadth of interest to readers. Accepted papers will immediately appear online. The Journal welcomes contributions that the manuscript is written in Indonesian or English. Scope The scope of this journal covers pure and applied physics. The topics include advanced material, optoelectronics, laser applications, biophysics, medical physics, instrumentation, geophysics, environmental physics, and related fields.
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 43 Documents
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Unlocking Drug Delivery Potential: The Crucial Role of Liposome Mechanical Properties Gregoria
BULETIN FISIKA Vol. 27 No. 2 (2026): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2026.v27.i02.p02

Abstract

The mechanical properties of liposomes play a critical role in determining their stability, drug release behavior, biodistribution, and interaction with biological barriers. These properties are primarily governed by lipid composition, including the degree of acyl chain saturation, tail length, and headgroup charge. Cholesterol incorporation is a widely used strategy to increase membrane rigidity by condensing the bilayer and reducing permeability. Temperature also modulates mechanical behavior, with liposomes transitioning from a rigid gel phase below the lipid phase transition temperature to a more fluid and permeable liquid-crystalline phase above it. Structural features such as liposome size and lamellarity further influence mechanical performance, larger liposomes tend to be more flexible, whereas multilamellar vesicles exhibit greater stiffness. Precisely controlling liposome stiffness through careful manipulation of their mechanical properties is a fundamental design principle for creating more effective nanocarriers in cancer therapy. Achieving moderate liposome stiffness is particularly advantageous, as it can result in extended circulation within the bloodstream and enhanced accumulation within tumors by exploiting the enhanced permeability and retention effect.
Design and Construction of a Portable and Real-Time Monitoring System Based on the Internet of Things (IoT) for CO2 Gas Leaks Novia Masni Dwi Putri; Abdul Muid; Nina Siti Aminah; Irfan Dwi Aditya
BULETIN FISIKA Vol. 27 No. 2 (2026): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2026.v27.i02.p01

Abstract

Carbon dioxide (CO₂) is the second most abundant contributor to the greenhouse effect after water vapor. Its atmospheric concentration has continued to rise over the past decade, correlating with the increase in global average temperature. Carbon Capture and Storage (CCS) is a technological approach designed to reduce CO₂ emissions by capturing CO₂ from industrial sources, transporting it to designated sites, and storing it securely. Continuous monitoring of CO₂ levels plays a critical role in CCS operations to ensure that stored CO₂ does not leak back into the atmosphere. This study presents a portable, real-time monitoring system for detecting CO₂ leakage using an MG-811 sensor integrated with an Internet of Things (IoT) platform. The system utilizes long-range communication networks for data transmission, enabling real-time visualization and analysis. In contrast to previous research, the proposed system not only displays concentration data but also includes an early warning feature and user-friendly visualization. It is powered by solar energy, allowing autonomous operation in remote areas.The results demonstrate that the sensor responds effectively to variations in gas concentration and environmental parameters. The system provides leakage vulnerability alerts using three categories: SAFE, ALERT, and DANGER. This approach enables faster identification of potential CO₂ leakage, supporting earlier and more effective mitigation actions.
Designing Phantom Femur Using Gypsum Material as an Alternative to Human Bone in the Radiology Department of Simpang Lima Gumul Hospital Kediri Vike Meidina; Yuniar Alam; Ulfa Niswatul Khasanah
BULETIN FISIKA Vol. 27 No. 2 (2026): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2026.v27.i02.p03

Abstract

The purpose of this study was to evaluate the similarity of radiation characteristics between femur phantoms and human bones. A total of six samples were used, made of gypsum composed of calcium sulfate hemihydrate (CaSO4•1/2H2O). The femur phantoms used were ± 2.5 cm long with a diameter of 14 cm. The cassette used measured 30x40cm. Based on the test results at Simpang Lima Gumul Regional General Hospital, the Hounsfield Unit (HU) value of the phantom was 1084.74 HU, and the Hounsfield Unit (HU) value of real bone was 1598.8 HU, with a difference of 32.15%. The HU value of the bone in axial scanning ranged from +800.15 HU to +1112.03 HU, and in helical scanning ranged from +852.57 HU to +1188.28 HU, with a tolerance range between +700 HU and +3000 HU. The femur phantom fabricated from gypsum demonstrated an average Hounsfield Unit value of 1084.74 HU, falling within the tolerance range of natural bone (700–3000 HU), thereby resembling the radiological density of bone.

Page 5 of 5 | Total Record : 43

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