3,670 research outputs found

    A Study of An Oscillating Water Column (OWC) to Harvest Wave Energy Using FLUENT Software

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    Oscillating water column (OWC) is the technology for harnessing the motion of ocean or sea waves as they push an air pocket up and down behind a breakwater, turning a turbine and drives a generator to produce electricity. The purpose of this project are to numerically and experimentally study the OWC design, to design and develop an OWC wave generator and investigates its application on offshore structures. The scope of the project is focuses on what is happening inside air chamber where it will involve various types of fluid flow patterns and pressure inside the air chamber. In order to achieve the objectives, Computational Fluid Dynamics (CFD) is used to simulate the flow patterns inside the air chamber. The software used for the CFD analysis are FLUENT and GAMBIT, where the operating conditions and other types of properties can be varied easily to evaluate the flow rate of the air exits and retreat backs to the air chamber and the pressure inside it. Finally, it will lead to design changes that improve the effectiveness of the OWC. There 12 designs of OWC model that have been simulated and studied. The best possible ways to optimize the model are to use 40o of inclined angle or arc radius, increase the height of the entrance inlet, increase the length of the air chamber, reduce the height of the air chamber or change the location of the pipe connected to the air turbine from top to the side of the air chamber. However, since all parameters are connected and related to each other, the best possible design need to be further studies

    CANSAT INTEGRATION USING MICROCONTROLLER

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    This research emphasizes on the operation of CanSat which involves monitoring the temperature and pressure of the surrounding environment where the data can be transmitted almost instantaneously on demand. The satellites monitoring is done by using the accelerometer to determine the direction heading and the pressure sensor to determine the altitude

    Study on the Characterization of Silica Sand Nanoparticles-Iron Based Composites (Fe-SiO2) Using Nitrogen Atmosphere as Sintering Environment

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    Metal Matrix Composite has become an attractive alternative in various applications especially in automotive and aerospace industries nowadays. Therefore, in order to study the characterization of Silica Sand Nanoparticles-Iron Based Composites (Fe-SiO2) using Nitrogen atmosphere as sintering environment, samples were fabricated by mixing pure iron with different weight percentages (5%, 10%, 15% and 20%) of silica sand nanoparticles and undergone several testing and observation before being evaluate. The silica sand nanoparticles-iron based composites were developed by powder metallurgy technique and being sintered in Nitrogen atmosphere at 11000C. The characterization that being evaluated include physical properties (density of green and sintered silica sand nanoparticles-iron based composites), microstructureanalysis (Optical Microscopy & FESEM), elemental composition (EDX Analysis) and mechanical properties (microhardness test of silica sand nanoparticles-iron based composites). The research shows densities were reduced from pure iron to 20wt% of silica sand nanoparticles. However, there were increments in each density of the composite after being sintered which at the same time improved its hardness as well. During sintering, the microstructure also exhibits changes in porosity, pore size also pore shape and with the high rate of atomic motion progressively (diffusion) leads to growth of bonds between particles, shown by the microstructure analysis being conducted. Theoretically stated those properties will improved after sintering process were proven and the composite with highest weight percentage of silica sand nanoparticles (20wt%) offered the best characteristics compared to others

    PERMINTAAN JASA LAYANAN KESEHATAN DI ACEH (STUDI KASUS : RUMAH SAKIT UMUM ZAINAL ABIDIN BANDA ACEH)

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    ABSTRAKJudul : Permintaan Jasa Layanan Kesehatan di Aceh (Studi Kasus: Rumah Sakit Umum Zainal Abidin Banda Aceh) Nama : Muhammad HafizNIM : 1201101010162Fakultas/Jurusan : Ekonomi dan Bisnis/ Ekonomi PembangunanDosen Pembimbing : Ikhsan, SE, M.APenelitian ini bertujuan untuk memahami dan menjelaskan beberapa faktor yang mempengaruhi permintaan jasa layanan kesehatan khususnya di Aceh. Berdasarkan penelitian terdahulu dan teori yang ada, beberapa faktor tersebut adalah pendapatan keluarga, jarak, jumlah tanggungan dan tingkat pendidikan. Penelitian ini menggunakan metode analisis regresi linier berganda dengan menggunakan SPSS versi 24. Hasil penelitian yang diperoleh menunjukkan bahwa pendapatan keluarga dan tingkat pendidikan berpengaruh positif dan signifikan terhadap permintaan jasa layanan kesehatan, jarak tempat tinggal berpengaruh negatif dan signifikan terhadap permintaan jasa layanan kesehatan, sedangkan jumlah tanggungan berpengaruh positif tetapi tidak signifikan terhada p permintaan jasa layanan kesehatan. Jadi penulis menyarankan untuk pemerintah agar memperhatikan tingkat pendapatan, mutu pendidikan dan transportasi umum agar dapat meningkatkan permintaan terhadap kesehatan. Serta ruang lingkup penelitian bisa di perluas lagi terhadap rumah sakit swasta, agar ada perbandingan rumah sakit umum dan swasta.Kata Kunci :Permintaan layanan kesehatan, Pendapatan, Jarak, Jumlah tanggungan, Tingkat pendidikan

    KAJI EKSPERIMENTAL PENGARUH PANJANG LALUAN PIPA PADA PENUKAR KALOR BERBELOKAN TAJAM

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    Unit penukar kalor adalah suatu alat untuk memindahkan kalor dari suatu fluida bertemperatur tinggi ke fluida bertemperatur lebih rendah. Sebagian besar dari industri kimia selalu menggunakan alat ini, sehingga alat penukar kalor ini mempunyai peran yang sangat penting dalam suatu proses produksi atau operasi. Kajian eksperimental telah dilakukan untuk perpindahan panas konveksi paksa dan koefisien panas pada saluran pipa bulat sepanjang 6 meter, dengan membandingkan empat alat penukar kalor dengan variasi panjang laluan dan belokan yang berbeda-beda, yaitu alat penukar kalor panjang laluan 600 mm dengan 14 belokan, alat penukar kalor panjang laluan 450 mm dengan 22 belokan, alat penukar kalor panjang laluan 300 mm dengan 30 belokan dan alat penukar kalor panjang laluan 150 mm dengan 55 belokan. Fluida panas dialirkan kedalam tube, tube tersebut direndam dalam bak penampungan air dingin. Masing-masing alat penukar kalor di lakukan tiga kali percobaan dengan variasi temperatur inlet fluida panas yang berbeda, yaitu 600C, 700C dan 800C. Pengujian dilakukan sampai temperatur air panas yang keluar stabil dengan selang waktu pengambilan data selama 5 menit. Turbulensi aliran akan meningkatkan koefisien perpindahan panas namun menghambat laju aliran fluida, sehingga koefisien perpindahan panas menurun. Efisiensi tertinggi terdapat pada HE 30 belokan yang memiliki nilai koefisien perpindahan panas padaT inlet 600C sebesar 554.48 W/m2 0C, pada T inlet 700C sebesar 627.36 W/m2 0C, dan pada T inlet 800C sebesar 699.87 W/m2 0C

    Jet Sintering of High Temperature Carbon Steel Powder Particles

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    Cutting process by using abrasive saw produces millions of tiny sparkling particles ripped apart from the original material. These particles are sent to fly in the air for a few milliseconds before hitting a substrate. If remain untouched, this particles will be collected as an aggregate on the surface of the substrate. It will gradually form a small hill with some interesting characteristics to be studied further. So, in this project, the author had studied the microstructure of the collected particles and learned about the new mechanism of sintering inside the material. In order to achieve the objective, the author cut the material into few parts. Then, the author mounted, grinded, polished and etched each part of it. Then, the author studied the samples under optical microscope. The author will also used Micro Vickers harness testing to check its mechanical properties. From all these steps, the author managed to observe some of the steel microstructure from it. The author also calculated the porosity of the material under microscopy using scale approximation. The author was able to learn about new kind of mechanism inside the material which will help us to understand more about sintering process. As a conclusion, this project was based on research of new kind of mechanism involved in this material. It is just a matter of time for us to unlock the secrets of this technique, its mechanisms and the outcome from this proces

    Comparison between the modern and Islamic concept of team building

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    This paper tries to describe the different concepts of team building. It shows the Comparison between the modern and Islamic concepts of team building, function, norms and values and relationships among the team members and some differences. This paper also discusses the main issues and conflicts among the members of the group and organization. In the last section this paper describes the dissimilarities between the modern and Islamic function of the groups. Design/Methodology In this study I have analyzed and interpret the literature to discuss the Islamic and modern point of view about human team building. Findings This paper tries to conclude some comparisons between the Islamic and modern concept of team building Key words Team building, teams, work groups, organizations
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