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ANALISA NUMERIK TSUNAMI PANGANDARAN DAN IMPLIKASINYA TERHADAP MITIGASI BENCANA Lulut Alfaris; Arif Baswantara; Suhernalis Suhernalis
Marlin : Marine and Fisheries Science Technology Journal Vol 1, No 1 (2020): (Februari, 2020)
Publisher : Politeknik Kelautan dan Perikanan Pangandaran

Lempeng Eurasia adalah lempeng tektonik terbesar ketiga yang berada di daerah Eurasia, daratan yang terdiri dari benua Eropa dan Asia. Lempeng Sunda merupakan bagian dari Lempeng Eurasia yang rumit secara tektonik dan aktif secara seismik.Adapun tujuan penelitian ini adalah untuk menentukan karakterisik pola patahan akibat gempabumi tanggal 17 Juli 2006 di Laut Selatan Jawa dengan sumber data dari katalog gempa bumi USGS. Analisis bola fokus bahwa gempa tanggal 17 Juli 2006 dengan koordinat 9.3° S dan 107.4° E adalah kombinasi sesar mendatar dan sesar naik atau jenis sesar ini disebut juga oblique. Hasil analisis 3D Focal Mechanism dan perhitungan rumus empiris menunjukkan bahwa terjadinya penjalaran gelombang tsunami (Tsunami Travel Time) kedaerah pantai dipesisir Jawa selatan mempunyai waktu sekitar 30 menit, sehingga diperlukan kesiapsiagaan dalam menghadapi bencana. The Eurasian Plate is the third largest tectonic plate in the Eurasia region, a land consisting of Europe and Asia. The Sunda Plate is part of the Eurasian Plate which is complicated by tectonics and seismically active. The purpose of this study is to determine the characteristics of the fault patterns due to the earthquake on 17 July 2006 in the South Sea of Java with data sources from the USGS earthquake catalog. Focus ball analysis that the earthquake on July 17, 2006 with coordinates 9.3° S and 107.4° E is a combination of horizontal faults and rising faults or this type of fault is also called oblique. The results of the 3D Focal Me chanism analysis and the calculation of empirical formulas indicate that the occurrence of tsunami wave propagation in the coastal areas of South Java approximately 30 minutes, so that preparedness is needed in the face of disasters.

PENGARUH RESPON GERAKAN TANKER PADA SISTEM TERTAMBAT CONVENTIONAL BUOY MOORING (CBM) TERHADAP VARIASI BEBAN LINGKUNGAN Yuni Ari Wibowo; Anas Noor Firdaus; Lulut Alfaris
Marlin : Marine and Fisheries Science Technology Journal Vol 3, No 1 (2022): (Februari 2022)
Publisher : Politeknik Kelautan dan Perikanan Pangandaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/marlin.V3.I1.2022.15-25

Perkembangan sistem transfer minyak dan gas lepas pantai terapung tidak bisa dilepaskan dari perkembangan sistem tambat untuk menjaga posisi bangunan apung dalam kondisi stasionkeeping. Respon gerakan dan tension tali tambat merupakan parameter penting yang digunakan dalam merancang konfigurasi sistem tali tambat. Sistem tali tambat yang biasa digunakan pada perairan dangkal adalah sistem Conventional buoy Mooring (CBM), selain kemudahan dalam proses instalasi dan perawatan, sistem ini juga relatif lebih murah jika dibandingkan dengan sistem point mooring yang dapat berputar mengikuti arah beban lingkungannya (weathervaning). Analisis numerik pada konfigurasi tertambat CBM dilakukan untuk mengidentifikasi respon gerakan bangunan apung akibat beban lingkungan secara collinear dan non-collinear. Simulasi time domain Cummins dilakukan untuk menyelesaikan persamaan gerak tanker dan sistem tambat secara simultan. Pada analisis yang dilakukan, didapatkan respon gerakan tanker pada kondisi pembebanan non-collinear lebih dominan pada gerakan surge, sway dan pitch sebesar 82%, 10% dan 12% secara berturut-turut. Sedangkan gerakan heave, roll dan yaw, respon gerakan lebih besar ditemukan pada pembebanan collinear sebesar 3%, 64% dan 17% secara berturut-turut. Berdasarkan analisis fast fourier transform (FFT) didapatkan spectral density gerakan horizontal (surge, sway dan yaw) memiliki dua puncak, puncak pertama pada frekuensi rendah (0.00-0,10 rad/s), dipengaruhi oleh frekuensi natural sistem tertambat yang beresonansi dengan gelombang orde-2 dan puncak kedua pada frekuensi 0.30 rad/s yang dipengaruhi oleh gelombang orde-1.The development of a floating offshore oil and gas transfer system cannot be separated from mooring system development to maintain the position of the floating structure in a stationary condition. Motion responses and mooring line tensions are crucial parameters used in mooring system configuration design. The configuration of mooring system commonly used in shallow waters is the Conventional Buoy Mooring (CBM). In addition to the ease of installation and maintenance, this system is also relatively cheaper than the point mooring system, which rotates in the direction of the environmental load (weathervaning). Numerical analysis on the CBM moored configuration was carried out to identify the motion responses of the floating structure due to collinear and non-collinear environmental load cases. Cummins time domain simulation was carried out to solve motion equation of the tanker and mooring system simultaneously. This analysis generated motion response of tanker under non-collinear loading conditions was significat in surge, sway and pitch motion of 82%, 10% and 12%, respectively. While the heave, roll and yaw motion, greater response motion were found in collinear of 3%, 64% and 17%, respectively. Based on the fast Fourier transform (FFT) analysis, it found the spectral density of horizontal motion (surge, sway and yaw) has two peaks, the first peak is at a low frequency (0.00-0.10 rad/s), influenced by the natural frequency of the moored system which resonates with the 2nd order wave and a second peak at a frequency of 0.30 rad/s which is influenced by a 1st order wave.

Rancang Bangun Alat Destilasi Air Laut yang Dilengkapi Pemanas Air Sederhana Raihan Natawisastra; Rikha Bramawanto; Ma’muri Ma’muri; Lulut Alfaris; Suhernalis Suhernalis
Jurnal Kelautan Nasional Vol 17, No 2 (2022): AGUSTUS
Publisher : Pusat Riset Kelautan

Penduduk Indonesia yang tinggal di kawasan pesisir belum seluruhnya mendapatkan akses air tawar yang bersih dan layak konsumsi. Bantuan Pemerintah berupa alat desalinasi air laut berteknologi tinggi seperti sea water reverse osmosis, seringkali terkendala dalam pengoperasiannya. Salah satu alat desalinasi air laut paling sederhana dan mudah diterapkan oleh masyarakat pesisir adalah solar water distiller. Project ini mengaplikasikan konsep passive solar still konvensional yang ditambahkan alat pemanas air sederhana untuk meningkatkan laju evaporasi. Makalah ini menyajikan proses pembuatan alat tersebut mulai dari desain, pemilihan bahan, fabrikasi hingga pengujiannya. Hasil riset menunjukkan bahwa alat destilasi air laut dengan penambahan pemanas air sederhana efektif meningkatkan suhu air laut/brine secara signifikan. Kondisi tersebut memicu efisiensi peningkatan laju evaporasi (>300% pada kondisi optimum) sehingga dapat meningkatkan kecepatan produksi air suling. Hasil pengamatan menunjukkan bahwa air suling yang dihasilkan memiliki nilai rata rata TDS=11 mg/L, pH=7,3, tidak berbau dan tidak berasa. Dengan demikian berdasarkan standar baku mutu yang ditetapkan oleh Menteri Kesehatan Republik Indonesia, air hasil destilasi tersebut layak untuk keperluan higiene sanitasi dan dapat dikonsumsi setelah melalui proses pemanasan untuk mematikan bakteri. Alat penyulingan air laut ini berbiaya murah dan dapat diaplikasikan dengan mudah oleh masyarakat di kawasan pesisir, baik dalam pengoperasian maupun penggantian suku cadang

SOLUSI ANALITIK RESPON GERAKAN SURGE OCEAN THERMAL ENERGY CONVERSION BERBENTUK TENSIONED LEG PLATFORM (OTEC-TLP Yuni Ari Wibowo; Raditya Danu Riyanto; Lulut Alfaris; Arif Baswantara
Marlin : Marine and Fisheries Science Technology Journal Vol 3, No 2 (2022): (Agustus 2022)
Publisher : Politeknik Kelautan dan Perikanan Pangandaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/marlin.V3.I2.2022.103-112

Peningkatan kebutuhan energi dunia relatif mengalami peningkatan yang cukup signifikan dari tahun ke tahun. Kebutuhan akan Energi Baru Terbarukan (EBT) juga meningkat seiring dengan menurunnya cadangan energi fosil. Ocean Thermal Energy Conversion (OTEC) menajdi salah satu alternatif sumber EBT yang pengembangan teknologinya berkembang dalam beberapa dekade terakhir. Umumnya OTEC menggunakan barge sebagai struktur apung penyangganya, namun dengan bertambahnya kedalaman perairan barge menjadi tidak lagi ekonomis. Tipe struktur apung Tensioned Leg Platform (TLP) menjadi solusi pada daerah perairan dalam (>1000m). Struktur OTEC-TLP terdiri dari ponton dan kolom yang ditambatkan secara taut dengan memanfaatkan daya apung. Daya apung dari struktur ini dipengaruhi oleh perbedaan sarat air saat kondisi free floating dengan sarat air tertambat (DT). Perubahan DT akan mempengaruhi parameter hidrodinamika yang terdiri dari massa tambah, kekakuan, periode alami, gaya dan respon struktur. Studi ini dilakukan untuk mengidentifikasi pengaruh DT terhadap sensitivitas parameter hidrodinamika dengan pendekatan analitik. Persamaan Morison digunakan dalam studi analitik ini untuk menyelesaikan respon gerakan surge. Berdasakan studi yang dilakukan, semakin besar DT, menyebabkan kenaikan pada massa tambah, kekakuan, gaya dan respon struktur pada gerakan surge. Periode alami OTEC-TLP pada saat DT rendah memiliki nilai yang lebih besar dibandingkan dengan DT yang lebih besar, namun keduanya memiliki periode alami yang relatif lebih besar jika dibandingkan dengan periode gelombang dominan (2 – 30s). Kondisi ini menjadikan OTEC-TLP memiliki kondisi stationkeeping yang baik karena tidak berada pada area periode gelombang dominan.Increasing demand of energy worlwide is increasing significantly year on year. The need for New and Renewable Energy (NRE) also increases along with the decline in fossil energy reserves. Ocean Thermal Energy Conversion (OTEC) is a viable alternative sources of NRE which has been in the development process in the last few decades. In general, OTEC uses barge as its floater, however in accordance with increasing water depth, the barge becomes no longer economical. Tensioned Leg Platform (TLP) is a solution in deep water areas (>1000m). OTEC-TLP structure consists of pontoons and columns which are tethered by means of buoyancy. The buoyancy of floater is formed by the difference of drafts (DT) between tethered and free floating condition. Changes in DT will induce the hydrodynamic parameters consisting of added mass, stiffness, natural period, force and structural response. This study was conducted to identify the effect of DT on the sensitivity of hydrodynamic parameters with an analytical approach. Morison's equation is used in this study to solve the surge motion response. Based on this study, the greater DT induce the higher added mass, stiffness, force and response of the structure in surge motion. The natural period of OTEC-TLP at low DT has a larger natural period than the higher DT. However both of them have relatively larger natural periods when compared to the wave period (2 – 30s), this condition creates OTEC-TLP having a good stationkeeping responses.

Non-Linear Regresion And Bisection Method Numerical Analysis of Humidity And Temperature Relationships Lulut Alfaris; Ruben Cornelius Siagian; Budiman Nasution; Goldberd Harmuda Duva Sinaga; Indah Indah
Jurnal Pendidikan Fisika dan Teknologi (JPFT) Vol 8 No 2 (2022): July-December
Publisher : Department of Physics Education, Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpft.v8i2.4394

This study aims to analyze the correlation of temperature and humidity based on climatological data from Kuningan, West Java province, Indonesia, using non-linear regression and numerical analysis using the bisection method. In studying the education curriculum in Indonesia, most of them have studied linear regression, but only within certain limits, namely linear and multiple. It is still rare for students to use non-linear regression in their analysis. This paper will explain the analysis using non-linear regression as a source of data and equations in numerical analysis so that it can be applied in the context of the numerical bisection method. As for data processing and numerical analysis, Microsoft Excel is used. The authors combined the two variables in the non-linear analysis and used geometric equations for the numerical quotient analysis. The author displays the results of numerical graphs and real-time data obtained from the source "Data access viewer NASA."

Solution And Visualization 3D Plane Inverse Kinematics Method Wanri Lumbanraja; Lulut Alfaris; Budiman Nasution; Ruben Cornelius Siagian; Arip Nurahman
Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam Vol. 19 No. 2 (2022): Sainmatika : Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam
Publisher : Universitas PGRI Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31851/sainmatika.v19i2.9421

The hyper-redundant type of robot is a type of robot that in carrying out its duties in the field of kinematics its degrees of freedom exceed the required minimum degrees. The advantage will be increased capability in operation and performance, if the degrees of freedom are excessive, even in unorganized and complex systems and environments. Algebraic approach method in inverse kinematics algorithm analysis can use; analytic algebra, jacobian basis, analytic KI, exponential multiplication, grobner, and conformal geometry. Iterative approach method in inverse kinematics algorithm analysis can use; genetic algorithm, fuzzy logic, ANFIS, and evolutionary algorithm. The geometric approach method in the inverse kinematics algorithm analysis can use; capital method. The purpose of this study is to analyze a virtual 2 arm robot, which will use axis manipulation in three dimensions using an inverse kinematics solution, using a geometric approach. How to step along on the z axis by rotating and using the reverse kinematics solution to the desired location. The visualization results will be repeated so as to ensure the effectiveness of the algorithm. As for this algorithm will provide a single solution, and this algorithm will prevent and reduce singularities if the link is lower.

PENGARUH RESPON GERAKAN TANKER PADA SISTEM TERTAMBAT CONVENTIONAL BUOY MOORING (CBM) TERHADAP VARIASI BEBAN LINGKUNGAN Yuni Ari Wibowo; Anas Noor Firdaus; Lulut Alfaris
Marlin : Marine and Fisheries Science Technology Journal Vol 3, No 1 (2022): (Februari 2022)
Publisher : Politeknik Kelautan dan Perikanan Pangandaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/marlin.V3.I1.2022.15-25

Perkembangan sistem transfer minyak dan gas lepas pantai terapung tidak bisa dilepaskan dari perkembangan sistem tambat untuk menjaga posisi bangunan apung dalam kondisi stasionkeeping. Respon gerakan dan tension tali tambat merupakan parameter penting yang digunakan dalam merancang konfigurasi sistem tali tambat. Sistem tali tambat yang biasa digunakan pada perairan dangkal adalah sistem Conventional buoy Mooring (CBM), selain kemudahan dalam proses instalasi dan perawatan, sistem ini juga relatif lebih murah jika dibandingkan dengan sistem point mooring yang dapat berputar mengikuti arah beban lingkungannya (weathervaning). Analisis numerik pada konfigurasi tertambat CBM dilakukan untuk mengidentifikasi respon gerakan bangunan apung akibat beban lingkungan secara collinear dan non-collinear. Simulasi time domain Cummins dilakukan untuk menyelesaikan persamaan gerak tanker dan sistem tambat secara simultan. Pada analisis yang dilakukan, didapatkan respon gerakan tanker pada kondisi pembebanan non-collinear lebih dominan pada gerakan surge, sway dan pitch sebesar 82%, 10% dan 12% secara berturut-turut. Sedangkan gerakan heave, roll dan yaw, respon gerakan lebih besar ditemukan pada pembebanan collinear sebesar 3%, 64% dan 17% secara berturut-turut. Berdasarkan analisis fast fourier transform (FFT) didapatkan spectral density gerakan horizontal (surge, sway dan yaw) memiliki dua puncak, puncak pertama pada frekuensi rendah (0.00-0,10 rad/s), dipengaruhi oleh frekuensi natural sistem tertambat yang beresonansi dengan gelombang orde-2 dan puncak kedua pada frekuensi 0.30 rad/s yang dipengaruhi oleh gelombang orde-1.The development of a floating offshore oil and gas transfer system cannot be separated from mooring system development to maintain the position of the floating structure in a stationary condition. Motion responses and mooring line tensions are crucial parameters used in mooring system configuration design. The configuration of mooring system commonly used in shallow waters is the Conventional Buoy Mooring (CBM). In addition to the ease of installation and maintenance, this system is also relatively cheaper than the point mooring system, which rotates in the direction of the environmental load (weathervaning). Numerical analysis on the CBM moored configuration was carried out to identify the motion responses of the floating structure due to collinear and non-collinear environmental load cases. Cummins time domain simulation was carried out to solve motion equation of the tanker and mooring system simultaneously. This analysis generated motion response of tanker under non-collinear loading conditions was significat in surge, sway and pitch motion of 82%, 10% and 12%, respectively. While the heave, roll and yaw motion, greater response motion were found in collinear of 3%, 64% and 17%, respectively. Based on the fast Fourier transform (FFT) analysis, it found the spectral density of horizontal motion (surge, sway and yaw) has two peaks, the first peak is at a low frequency (0.00-0.10 rad/s), influenced by the natural frequency of the moored system which resonates with the 2nd order wave and a second peak at a frequency of 0.30 rad/s which is influenced by a 1st order wave.

Study Review of the Speed of Light in Space-Time for STEM Student Lulut Alfaris; Ruben Cornelius Siagian; Eko Pramesti Sumarto
Jurnal Penelitian Pendidikan IPA Vol 9 No 2 (2023): February
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v9i2.2757

The author of this article aims to review the theory of relativity and its implications for physics education by using visual aids and a programming approach. The article will cover the concept of the speed of light in space-time in the context of relativity, and provide illustrations that explain the relationships in the context of general relativity. The focus of the article will be to introduce students to complex concepts and encourage their interest in the topic. The author reports success in teaching the basic concept of the speed of light in space-time to both elementary STEM students and high school students. While the theory of relativity has been taught at the secondary school level in some education systems, there is a lack of research on the effectiveness of using visual aids and a programming approach to enhance students' understanding of the concept. This article aims to fill the gap by evaluating the impact of this approach on students' understanding of the theory of relativity

Basic Mechanics of Lagrange and Hamilton as Reference for STEM Students Budiman Nasution; Lulut Alfaris; Ruben Cornelius Siagian
Jurnal Penelitian Pendidikan IPA Vol 9 No 2 (2023): February
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v9i2.2920

This paper discusses the use of Lagrangian and Hamiltonian dynamics as alternative approaches for understanding the motion of objects in classical mechanics. These approaches, which are based on different mathematical techniques, can provide a deeper understanding of the principles of classical mechanics and the motion of objects, but may not be covered in high school physics curricula or undergraduate STEM courses. The review paper approach is used to combine information from a variety of sources, and the material is conceptualized to aid reader understanding. These advanced topics may be of interest to advanced high school students who are interested in exploring topics beyond the high school physics curriculum, and can be studied independently by those with a strong foundation in classical mechanics and familiarity with advanced mathematical concepts.

SYNTHESIS AND CHARACTERIZATION OF ENVIRONMENTALLY FRIENDLY PAPERCRETE AS A NEW MORTAR FOR BRICK PANEL INSTALLATION Goldberd Harmuda Duva Sinaga; Ruben Cornelius Siagian; Mia Endang Sari Sinaga; Lulut Alfaris
TECHNO-SOCIO EKONOMIKA Vol 16, No 1 (2023): Jurnal Techno-Socio Ekonomika - April
Publisher : LPPM Universitas Sangga Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32897/techno.2023.16.1.2103

This research focuses on the development of lightweight and soundproof building materials using waste paper or pulp as a component, with the aim of improving quality of life and reducing environmental pollution. Papercrete, made from unused waste paper, has environmentally friendly characteristics and can be used as the main structure of buildings. The study investigated the effect of pulp on the stress behavior of panels and tested the reusability of paper as a lightweight and eco-friendly brick material. The research method involved experimental procedures, using specialized equipment and materials to determine the properties and performance of different types of concrete mixes. Results indicate that papercrete has potential as an eco-friendly construction material with physical and mechanical properties suitable for reinforcing brick panels. Further research is recommended to investigate the effect of paper chip size on concrete strength under different humidity and temperature conditions, and to analyze the environmental impact of using papercrete as a construction material. The findings suggest that papercrete holds promise as a new and sustainable construction material. Testing papercrete in real-world scenarios could provide valuable insights into its durability and suitability for different applications.

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