Garuda - Garba Rujukan Digital

Pengaruh Variasi Jumlah Sudu dan Twist Angle Terhadap Performa Turbin Heliks Menggunakan Metode CFD Sugiri, Agus
JURNAL MECHANICAL Vol 15, No 1 (2024): JURNAL MECHANICAL
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar

Energi arus air merupakan salah satu potensi energi terbarukan yang mudah ditemukan seperti saluran irigasi, aliran sungai dan gelombang laut. Selain ramah lingkungan energi arus air juga memiliki intensitas energi kinetik yang cukup besar. Pemanfaatan potensi arus air untuk menghasilkan listrik dapat dilakukan menggunakan turbin heliks. Turbin heliks merupakan bentuk modifikasi dari turbin darrieus, untuk mengatasi kelemahan turbin darrieus sudu pada turbin heliks dibuat berbentuk melengkung dengan kemiringan sudut tertentu. Penelitian ini bertujuan untuk mengetahui unjuk kerja turbin heliks menggunakan metode CFD. Penelitian ini dilakukan dengan melakukan simulasi terhadap penambahan jumlah sudu dan twist angle pada turbin heliks. Variasi jumlah sudu adalah 2, 3 dan 4 sudu sedangkan variasi twist angle sebesar 60°, 90° dan 120°. Hasil simulasi menunjukkan bahwa penambahan jumlah sudu dan twist angle berpengaruh positif terhadap performa turbin heliks, terjadi peningkatan nilai torsi yang diperoleh. Penambahan jumlah sudu dan twist angle akan mengakibatkan massa/beban turbin saat berputar semakin tinggi atau yang disebut dengan momen inersia sehingga menghasilkan gaya lebih besar dan torsi meningkat. Hasil simulasi dengan menggunakan variasi jumlah sudu diperoleh performa terbaik pada jumlah sudu 4 dimana Cp yang dihasilkan sebesar 0,287. Pada pengujian dengan variasi twist angle didapat performa terbaik pada sudut 120° dengan nilai Cp yang dihasilkan sebesar 0,312.

Fibrin Gel Properties and Gelation Structures for Tissue Engineering Scaffold and Biomedical Engineering Applications Vadival, G N; Sukmana, Irza; Risano, A Yudi Eka; Sugiri, Agus; Hamdani, Fadil
International Journal of Aviation Science and Engineering - AVIA Vol. 5 No. 1: (June 2023)
Publisher : FTMD Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47355/avia.v5i1.85

Fibrin gel is utilized in a wide range of medical applications, such as hemostatic agents, wound healing, drug delivery, cell delivery, cell differentiation, and tissue engineering. Notably, fibrin gel exhibits exceptional extensibility compared to other filamentous biopolymers, capable of stretching over five times its original length without breaking. Remarkably, it can fully recover from elongations exceeding 100% once the applied stress is removed. This paper presents an optimized formulation of fibrinogen and thrombin tailored for culturing human umbilical vein endothelial cells (HUVEC). We explore the mechanical and physical properties of the fibrin gel, aiming to identify ways to enhance its medical applications. The gel is synthesized in vitro through the combination of fibrinogen and thrombin, allowing us to assess how varying the proportions of these components affects the gel structures and properties

Biomedical Material for Stent Application: Current Status and Future Challenges Sukmana, Irza; Chyanegoro, Arifo Gunawan; Sugiri, Agus
Journal of Applied Science, Engineering and Technology Vol. 1 No. 2 (2021): December
Publisher : INSTEP Network

Cardiovascular disease is the leading cause of death worldwide. Arterial stenting as a transluminal angioplasty procedure allows re-opening of narrowed vessels and restoring normal blood flow with stent placement. The development of stents ed at the end of 19 century with bare-metal stents (BMS). Now, it has been based on the application of biodegradable or natural decomposed and coated stents. The coated stent has been found to improve BMS properties in terms of biocompatibility, cytotoxicity, and better mechanical and biophysical properties. Also, a biodegradable stent may support the blood micro-vessel during the estimated period of time before downgraded constituents. The biodegradable stent also allows a reinsertion for several months to improve the vessel wall's quality. This paper describes the possible materials for stents and their properties such as design criteria, degradation behavior, disadvantages, and advantages with clinical and preclinical trials to date. Stent degradation allows reinsertion of the stent after several months and improves the vessel wall quality. This paper focuses on developing materials for stents, which describe the possible materials for stents and their properties. Furthermore, the current clinical trial of the new proposed stent will also be highlighted.

Activation of Natural Zeolite Mixture and Coal Flyash Using Microwave as Air Filter for the Improvement of Gasoline Four-Stroke Motorcycle Engine Acceleration Risano, A Yudi Eka; Wardono, Herry; Renardy, B Niko; Susila, M Dyan; Sugiri, Agus; Haviz, Muhammad
Journal of Applied Science, Engineering and Technology Vol. 4 No. 1 (2024): June 2024
Publisher : INSTEP Network

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47355/jaset.v4i1.70

Combustion is a chemical process between fuel and oxygen utilizing heat. Ambient air contains a variety of gases such as nitrogen, oxygen, and other gases, causing incomplete combustion in the combustion chamber of a 4-stroke petrol engine. The use of artificial air filters with zeolite-flyash composition activated by microwave can adsorb the air that enters the combustion chamber. So that it can improve the quality of combustion. Zeolite is a mineral that is found in limestone mountainous areas, while coal flyash is material from coal combustion at PLTU. Both of these materials have the ability to adsorb molecular sized particles such as nitrogen, CO and water vapor in the air, so the use of both materials is able to produce air with rich oxygen. The performance of the 4-stroke petrol engine is influenced by a decrease in fuel consumption, able to increase acceleration, and reduce exhaust emissions containing CO and HC. To find out the effect of the use of activated zeolite-flyash filters on engine performance, an acceleration test of 0-60 kph was performed. Filter being activated by Microwave with 80% power, 6 minutes activation time, and density (variation in the number of pellets in the filter) 50%, 75%, 100%, and use the Z0: F100, Z25: F75, Z50: F50, Z75: F25, Z100: F0. The best filter is the composition of Z100:F0 with a compactness of 50% able to increase acceleration by 7.17%, followed by filter with composition of Z25:F75 with a compactness of 50% able to increase acceleration by 4,04%.

The Effect of Sintering Temperature on The Adhesion Quality of Hydroxyapatite on Porous Tantalum for Cancellous Bone Implant Application Saputra, Rizal Adi; Sukmana, Irza; Tarkono; Sugiri, Agus; Syazwani, Nur; Djuansjah, Joy
Jurnal Inovasi Teknologi Vol 5 No 2 (2024): October
Publisher : Engineering Forum of Western Indonesian Government Universities Board (Forum Teknik, BKS-PTN Wilayah Barat) Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar

Porous tantalum has been recently recognized as a conventional orthopedic implant for bone substitute applications besides stainless steel, cobalt-chromium, titanium, and other metallic alloys. Porous tantalum has excellent mechanical and osseointegration properties similar to cancellous bone structure. To optimize the utilization, the dip coating technique was applied to coat porous tantalum with hydroxyapatite (HA). X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques investigate the coating characterization. HA is a bioceramic material that used for bone substitutes due to its chemical and structural similarity to bone minerals. Coated porous tantalum requires the sintering process of porous tantalum to adhere to HA. During the sintering process, various temperatures (650°C, 750°C, 850°C, 950°C, and 1100°C) were used to determine the optimum temperature for porous tantalum coated with HA. The heating rate is 1°C/1 min and the holding time is 60 minutes. The result shows that the optimum temperature of HA-coated porous tantalum is at 850°C. The morphology structure of the HA-coated porous tantalum shows that the adhesion between porous tantalum and HA is in good condition. The element in the HA-coated porous tantalum shows that the existence of HA is high.

Design and Calculation of NACA 4412 Horizontal Wind Turbine Blades with Variations in Angle of Attack Using BEM Simulation Sugiri, Agus; Su'udi, Ahmad; Ignatius, Gian Roni; Ghurri, Ainul; Saputra, Rizal Ada
Journal of Applied Science, Engineering and Technology Vol. 4 No. 1 (2024): June 2024
Publisher : INSTEP Network

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47355/jaset.v4i1.74

The need for electricity in Indonesia becoming increasingly part of people's needs. Fossil fuels such as oil and coal used as the main material for producing electrical energy the more limited availability, especially in its use of fossil fuels that pollute the environment. Wind energy is a renewable energy source that could potentially be developed. Wind energy is clean and does not pollute the environment in utilization into mechanical or electrical energy. The conversion of wind energy into electrical energy by converting this energy into mechanical rotation. In the wind energy utilization process made a tool to convert wind energy into electrical energy, that is wind turbines.Wind turbine or windmill is a tool for converting wind energy. Wind turbines transform kinetic energy into mechanical energy in the form of a round shaft. Shaft speed is then used to rotate the dynamo or a generator which produces electricity. The research was carried out on a horizontal axis wind turbine NACA 4412, diameter 1 m, the number of blades 3 pieces and variations in wind speed 2-8 m / s. Results showed the greatest lift (CL) at 14o angle of attack with a value of 1.583. The driving force of the smallest (CD) at an angle of attack -4o to 2o with a value of 0.008. Value CL / CD was found in the angle of attack of 6o with a value of 93.057. The maximum power generated by 484.63 Watt. Wind speed, the number of blades, angle of attack and the election of the airfoil effect on the generated power.

Effect of Sintering Temperature on The Adhesion Quality of Hydroxyapatite on Porous Tantalum for Cancellous Bone Implant Application Rahman, Nur Syazwani Binti Ab; Sukmana, Irza; Djuansjah, Joy R P; Tarkono; Sugiri, Agus; Saputra, Rizal Adi
Jurnal Inovasi Teknologi Vol 5 No 2 (2024): October
Publisher : Engineering Forum of Western Indonesian Government Universities Board (Forum Teknik, BKS-PTN Wilayah Barat) Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar

Porous tantalum has been recently recognized as a conventional orthopedic implant for bone substitute applications besides stainless steel, cobalt-chromium, titanium, and other metallic alloys. Porous tantalum has excellent mechanical and osseointegration properties similar to cancellous bone structure. To optimize the utilization, the dip coating technique was applied to coat porous tantalum with hydroxyapatite (HA). X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques investigate the coating characterization. HA is a bioceramic material that used for bone substitutes due to its chemical and structural similarity to bone minerals. Coated porous tantalum requires the sintering process of porous tantalum to adhere to HA. During the sintering process, various temperatures (650°C, 750°C, 850°C, 950°C, and 1100°C) were used to determine the optimum temperature for porous tantalum coated with HA. The heating rate is 1°C/1 min and the holding time is 60 minutes. The result shows that the optimum temperature of HA-coated porous tantalum is at 850°C. The morphology structure of the HA-coated porous tantalum shows that the adhesion between porous tantalum and HA is in good condition. The element in the HA-coated porous tantalum shows that the existence of HA is high.

Peningkatan Kemampuan Manajemen Energi Skala Rumah Tangga kepada Anggota Koperasi Kuntum Bunga Prayitno, Hadi; Sugiri, Agus; Lestari, Rahayu
Jurnal Pengabdian Kepada Masyarakat (JPKM) TABIKPUN Vol. 5 No. 3 (2024)
Publisher : Faculty of Mathematics and Natural Sciences - Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jpkmt.v5i3.151

Pertumbuhan penduduk dan konsumsi listrik di Bandar Lampung yang meningkat 0,89% pada 2022 menuntut manajemen energi yang bijak di rumah tangga. Ibu rumah tangga (IRT) di Koperasi Kuntum Bunga memainkan peran penting dalam mengurangi dampak penggunaan energi fosil yang meningkatkan emisi karbon dan kerusakan lingkungan. Melalui pendampingan, 70% peserta memahami dan menerapkan audit serta manajemen energi rumah tangga. Upaya ini berkontribusi pada pencapaian SDGs Goal 5, 7, 11, 13, dan 15. Penerapan manajemen energi yang efektif mendukung penghematan energi, menurunkan emisi gas rumah kaca, serta meningkatkan ketahanan lingkungan dan kesejahteraan keluarga. Dengan demikian, manajemen energi di tingkat rumah tangga dapat memberikan dampak positif bagi keberlanjutan lingkungan dan kehidupan sosial di Kota Bandar Lampung.

Title

Found 8 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 8 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 8 Documents
Search