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All Journal Rotasi Bulletin of Electrical Engineering and Informatics Rekayasa Mesin Journal of Mathematical and Fundamental Sciences PROSIDING SEMINAR NASIONAL CENDEKIAWAN Prosiding Seminar Nasional Pakar Jurnal Teknik Mesin dan Mekatronika (Journal of Mechanical Engineering and Mechatronics) Indonesian Journal of Computing, Engineering, and Design METAL : Jurnal Sistem Mekanik dan Termal
Lydia Anggraini
President University
Arts Astronomy Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Transportation

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PROSPEK BISNIS DENGAN TEKNOLOGI DSSL (DRY SLUDGE SYNTHETIC LUBRICANT) SEBAGAI SOLUSI PENGURANGAN SLUDGE LIMBAH B3 (BERBAHAYA DAN BERACU N) SEKALIGUS PELUANG BENEFIT WAX (C20+) SEBAGAI SYNTHETIC LUBRICANT Annisa Nur Wahyuni; Lydia Anggraini
PROSIDING SEMINAR NASIONAL CENDEKIAWAN PROSIDING SEMINAR NASIONAL CENDEKIAWAN 2018 BUKU I
Publisher : Lembaga Penelitian Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/semnas.v0i0.3335

Abstract

PT Jababeka Infrastuktur Waste Water Treatment Plant (WWTP) mengolah air limbah kawasan industri Jababeka dengan system Biological Aerobic Treatment menghasilkan lumpur aktif (sludge) dengan kandungan B3. Sehingga harus menanggung biaya pengeluaran sebesar Rp. 58.175.000/bulan untuk pembuangan sludge pada PPLi. Komposisi Sludge adalah 50% bahan organik dan 50% bahan non organik, sehingga berpotensi pemanfaatan kembali sludge kedalam sektor yang lebih berguna. Melalui penelitian ini, peneliti berusaha menganalisa beberapa proses mengubah limbah B3 (Sludge) untuk dimanfaatkan menjadi synthetic lubricant dengan Teknologi DSSL (Dry sludge synthetic Lubricant). Teknologi DSSL (Dry Sludge Synthetic Lubricant) dapat dijadikan alternatif untuk memproses raw material sludge yang merupakan limbah B3 (berbahaya dan beracun) yang berasal dari Waste Water Treatment Plant (WWTP) Jababeka menjadi produk Wax (C20+) yang dapat berpeluang menjadi synthetic lubricant melalui proses Gasifikasi dan sintesa Fisher-Tropsch. Tujuan dari penelitian ini adalah minimisasi tingkat bahaya limbah berbahaya dan beracun, tingginya biaya pembuangan dan pengolahannya, serta peluang produk Wax (C20+) yang berkelanjutan. Melalui Penelitian ini, selain memberikan dampak bisnis yang menjanjikan, namun memberikan peluang keberlanjutan pada tahap implementasinya. Teknologi DSSL (Dry sludge synthetic Lubricant) juga memberikan dampak positif terhadap lingkungan karena dapat mengurangi bahaya limbah B3 terhadap lingkungan sekaligus menghasilkan benefit Wax (C20+) yang dapat dijadikan sebagai lubricants.
Nanolithography on the Electron Beam Resist using the Scanning Probe Microscope Cantilever Lydia Anggraini; Naoki Matsuzuka; Yoshitada Isono
Journal of Mathematical and Fundamental Sciences Vol. 42 No. 1 (2010)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.sci.2010.42.1.1

Abstract

This research demonstrates the feasibility of fabricating nanoscale resist patterns on a silicon (Si) substrate using a scanning probe microscope (SPM). In order to utilize scanning probe nanolithography (SPNL) with the other micro-machining techniques such as dry etching, plating and lift-off process, nanoscale resist patterns should be created on an Si substrate with high accuracy in SPNL. We have, so far, established the negative type of SPNL using the negative-tone electron beam (EB) resist named SAL601. The primary objective of this research is to find out appropriate process conditions for establishing the positive type of SPNL using the positive EB resist "³ZEP520A"³. This paper describes the variations of experimentally created nano-patterns depending on the process conditions, and determines the appropriate process conditions from the variations obtained. In addition, we analyzed the electric field in the EB resist by a finite element method (FEM), for estimating the line width of the nano-pattern created by SPNL.
Performance Optimization of Power Plant Waste Heat Using H2O-LiBr Absorption Refrigerant System Lydia Anggraini; Annisa Nur Wahyuni; Rendi Hernawan; Tetuko Kurniawan
Indonesian Journal of Computing, Engineering, and Design (IJoCED) Vol. 4 No. 1 (2022): IJoCED
Publisher : Faculty of Engineering and Technology, Sampoerna University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (585.782 KB) | DOI: 10.35806/ijoced.v4i1.243

Abstract

This paper examines the use of waste energy in a 3x1 MW Gas Engine Power Plant (GEPP) on Bawean Island, Indonesia. The feasibility method uses water-lithium bromide (H2O-LiBr) technology as absorption refrigeration technology. In addition, bananas are also used for cold storage to overcome waste energy utilization. The cold storage is placed in the 300 m3 area with a 100 kg load capacity for a banana with a temperature of 5oC, 85% humidity, 24 hours of operation, 1292 W cooling load, and 371 TR. This system is used because it utilizes a cheap energy source that dissipates heat from gas and has no ecological hazards, such as ozone layer depletion and global warming. The exhaust gas temperature is 500oC. Moreover, cooling loads for cold storage, which are used with thermodynamic models, and consistent fluid properties, performance, and size of cold storage were also investigated. The results obtained show that higher cold storage output comes from internal factors as compared to external factors. In addition, the absorption refrigerant with Tevaporation is 5oC, capacity 403 TR and Qabsorption is 984 kW, Qgenerator is 1066 kW, Qevaporation is 1411 kW, Qcondenser is 1493 kW, with an absorption coefficient of performance (COP) of 1.32 and power consumption of 158,25 kW. Furthermore, after calculations, analysis, and field experiments, it shows that the internal factor of the cooling load is higher than the external factor sourced from bananas in the cold storage. This phenomenon occurs probably due to the product being refrigerated, following the soar cooling capacity. Thus, the waste energy in PLTGU 3x1 MW has tried to be utilized by the refrigerant absorption system.
ANALISA STRUKTUR MIKRO PADA PROSES FIRING DALAM FABRIKASI WELDED BEAM DENGAN BAHAN SM490YB Lydia Anggraini
Prosiding Seminar Nasional Pakar Prosiding Seminar Nasional Pakar 2018 Buku I
Publisher : Lembaga Penelitian Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/pakar.v0i0.2660

Abstract

Welded beam adalah profile yang didapat dengan proses pengelasan 3 lembarplate yang terdiri dari 2 plate flange dan 1 plate web dibentuk menjadi profil IBeamatau H-Beam. Proses pengelasan dilakukan dengan mesin las khususSAW dan dilanjutkan proses pelurusan (straightening) karena akibat daripanas pengelasan tersebut menyebabkan profile welded beam akan bending atautwisted. Akibat proses panas saat pengelasan, maka ada minimal ukuranwelded beam dan tebal minimum platnya tidak akan dapat di luruskan kembalisaat proses straightening karena daya leleh material yang telah lewat batas saatproses pengelasan. Oleh karena itu pada area yang tidak dapat diluruskankembali perlu dilakukan firing dengan menggunakan flame Oxy-Acetylene.Penelitian ini bertujuan untuk mengetahui struktur mikro, properti mekanikpada material JIS G3106 Grade SM490YB.
DESAIN DAN PEMILIHAN BAHAN PADA HELM WAJAH TERBUKA DENGAN SISTEM AIRBAG DARI GFRP / EPP / NYLON Haryo Bisono Setyadi; Zairullah Azhar; Lutfi Fadilah; Lydia Anggraini
Prosiding Seminar Nasional Pakar Prosiding Seminar Nasional Pakar 2019 Buku I
Publisher : Lembaga Penelitian Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/pakar.v0i0.4178

Abstract

Helm merupakan perangkat yang wajib digunakan saat mengendari sebuah sepeda motor. Helm akan melindungi atau mengurangi dampak dari benturan ke kepala. Menggunakan helm adalah salah satu cara preventif dalam berkendara. Namun, perlindungan dari helm belumlah maksimal. Maka dari itu kami melakukan sebuah penelitian mengenai Helm dengan menggunakan Airbag System. Helm ini akan berkerja saat terjadi benturan yang keras dari belakang maupun pergerakan leher.Airbag ini tidak akan mengembang jika hanya terjadi crash tunggal. Helm ini berkerja menggunakan System yang terpisah dari helmnya. Pada bagian helm terdapat airbag dan gas untuk mengembangkan airbag-nya, serta sensor untuk menerima perintah. Material yang digunakan pada Helm ini ialah Glass Fiber Reinforced Polymer (GFRP) untuk cangkangnya, Expanded Polypropylene (EPP) untuk cangkang bagian dalam, dan Nylon 6,6 untuk airbag. Airbag akan mengembang pada bagian leher hingga pundak. Pada system yang terpisah dari helm ini berisi sistem yang akan membaca situasi berkendara. Sistem ini bisa membedakan situasi kecelakaan yang terjadi. Bila sistem membaca telah terjadi kecelakaan, maka sistem akan mengirimkan sensor untuk mengembangkan gas dihelm. Helm Open Face dengan Airbag System, sensornya bekerja sekitar 0,15 detik setelah terjadi crash.
ANALISA PENGARUH GAYA TEKAN AKHIR TERHADAP SAMBUNGAN LAS HASIL PENGELASAN GESEK BERBAHAN TEMBAGA DAN KUNINGAN Aprilia Putri Laurina; Lydia Anggraini
Prosiding Seminar Nasional Pakar Prosiding Seminar Nasional Pakar 2019 Buku I
Publisher : Lembaga Penelitian Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/pakar.v0i0.4179

Abstract

Pengelasan gesek (Friction Welding) adalah salah satu teknik pengelasan dengan panas yang beralasal dari dua permukaan logam yang saling bergesekan satu sama lain. Penelitian ini mengkaji tentang efek tekanan akhir pada proses pengelasan. Proses dilakukan dengan variasi tekanan 2,5 MPa dan 6 MPa serta perbandingan material tanpa lasan pada baja SCM415H. Hasil dari penelitian ini adalah semakin tinggi nilai tekanan maka semakin besar kekuatan sambungan yang dihasilkan pada sambungan tersebut. Dari penelitian semua dapat dilihat bahwa las gesek (friction welding) dapat menghasilkan hasil lasan yang mempunyai kekuatan yang tinggi sehingga tidak mudah putus atau patah pada sambungan dan kekerasan pada sambungan las meningkat setara dengan sambungan las pada umumnya.
Metamaterial and metasurface based emitters for solar thermal photovoltaic applications: analytical review Lydia Anggraini; Hendra Jaya Tarigan; Joni Welman Simatupang
Bulletin of Electrical Engineering and Informatics Vol 11, No 6: December 2022
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/eei.v11i6.3588

Abstract

The motivation behind this paper stemmed from the fact that the world consumes the fast-depleting fossil fuel energy. Before the fossil fuel runs out, new technologies to harvest energy from alternative sources are needed. Sunlight is clean, free and abundant. The market for solar thermal and photovoltaic electricity generation is expanding rapidly. Therefore, an analytical review on the types of emitter for solar thermal photovoltaic (STPV) applications utilizing metamaterials and metasurfaces is presented in this research study. STPV is still important in the development of an emitter technology. STPV classifications based on the types of materials, compositions, dimensions, geometries, and long-term temperature stability are considered. The ability to engineer STPV by controlling one or more of the foregoing physical parameters are useful for researchers. Different types of design and simulation tools are considered. The near future plans are to optimize the efficiency of the emitter and investigate how various layers and different combinations of metamaterials affect such an efficiency by employing a simulation tool such as finite-difference time-domain (FDTD, Lumerical).
THE EFFECT OF CURRENT VARIATION ON TENSILE STRENGTH IN SMAW WELDING USING SS400 STEEL Abdullah, Salman Faruqi; Anggraini, Lydia
Jurnal Teknik Mesin dan Mekatronika (Journal of Mechanical Engineering and Mechatronics) Vol 9, No 2 (2024): Jurnal Teknik Mesin dan Mekatronika (Journal of Mechanical Engineering and Mecha
Publisher : President University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33021/jtmm.v9i2.5522

Abstract

Welding is one of the important processes in the manufacturing industry. One of the welding methods that is currently used is metal arc welding (SMAW) shields. In smaw welding, the electric current used has a crucial role in determining the welding characteristics, including the tensile strength of the weld joint. The aim of this research is to determine the effect of variations in current strength on the tensile strength using SS400 steel. The method used in this research is the experimental method. This research was carried out by making specimens with a V-shaped seam which were then welded using varying amperage currents of 75 A, 85 A and 95 A. The material used was SS400 steel which had a thickness of 6 mm. So, from this research, the results obtained are the highest tensile accuracy value, namely at a flow accuracy of 95 on the ker 2 sample, resulting in a total tensile accuracy value of 1180.60 Kgf. And the lowest tensile accuracy value is at 75 flow curves in the ker 1 sample, resulting in a total tensile accuracy value of 1093.88 Kgf. This is due to the fact that each variation in current accuracy greatly influences the Tensile Accuracy.
Tensile Behavior of SM520B-1G Plate by SMAW Joint Applied for Elevated Highway Road Construction Anggraini, Lydia
Jurnal Teknik Mesin dan Mekatronika (Journal of Mechanical Engineering and Mechatronics) Vol 8, No 2 (2023): Jurnal Teknik Mesin dan Mekatronika (Journal of Mechanical Engineering and Mecha
Publisher : President University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33021/jtmm.v8i2.4748

Abstract

The main objective of this project is to study the mechanical and chemical characteristics of the SM520B welding plate used in the Jakarta-Cikampek Elevated Highway construction. The construction is needed to decrease the high volume of vehicles passing the highway every day. SM520B metal plate is used as the material in the girder box due to high strength and toughness and also good weldability.There are several tests conducted in the lab of PT Biro Klasifikasi Indonesia (Persero), i.e., spark OES test, tensile test, bending test, Charpy impact test, macro hardness test, and macro etch test. Spark OES test result shows that SM520B is low alloy steel with 0.165% carbon content. The SM520B tensile test result determines that the average yield strength, i.e., 503.45 N/mm², and the average tensile strength, i.e., 608.87 N/mm² of SM520B steel plate has met the requirement according to ASTM DS67B standard. The bending test result shows that no crack was found in the welding area. The Charpy impact test results of SM520B Welding plate indicates that high impact energy occurs in the welding area with the highest value of 214,24 J and slowly reduces when approaching close to the fusion line, i.e., 186.08 J. Higher Hardness Vickers value occurs in the HAZ area of SM520B during Vickers hardness, i.e., 235.8 J and the macro etch test result on the welding plate indicate there is no significant crack, porosity, and slag inclusion found in the welding.The main objective of this project is to study the mechanical and chemical characteristics of the SM520B welding plate used in the Jakarta-Cikampek Elevated Highway construction. The construction is needed to decrease the high volume of vehicles passing the highway every day. SM520B metal plate is used as the material in the girder box due to high strength and toughness and also good weldability.      There are several tests conducted in the lab of PT Biro Klasifikasi Indonesia (Persero), i.e., spark OES test, tensile test, bending test, Charpy impact test, macro hardness test, and macro etch test. Spark OES test result shows that SM520B is low alloy steel with 0.165% carbon content. The SM520B tensile test result determines that the average yield strength, i.e., 503.45 N/mm², and the average tensile strength, i.e., 608.87 N/mm² of SM520B steel plate has met the requirement according to ASTM DS67B standard. The bending test result shows that no crack was found in the welding area. The Charpy impact test results of SM520B Welding plate indicates that high impact energy occurs in the welding area with the highest value of 214,24 J and slowly reduces when approaching close to the fusion line, i.e., 186.08 J. Higher Hardness Vickers value occurs in the HAZ area of SM520B during Vickers hardness, i.e., 235.8 J and the macro etch test result on the welding plate indicate there is no significant crack, porosity, and slag inclusion found in the welding.
Impact Behavior of Multi-Layered UHMWPE Vests Reinforced with Titanium and PVC for Ballistic Protection Muzhaffar Effendi, Nabil; Sastranegara, Azhari; Hernawan, Rendi; Anggraini, Lydia
Indonesian Journal of Computing, Engineering, and Design (IJoCED) Vol. 7 No. 1 (2025): IJoCED
Publisher : Faculty of Engineering and Technology, Sampoerna University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35806/ijoced.v7i1.504

Abstract

Achieving lightweight and high-performance bulletproof vests is essential for military and law enforcement, where balancing mobility and ballistic resistance is critical. This study investigates the ballistic performance of multi-layered Ultra-High Molecular Weight Polyethylene (UHMWPE) vests reinforced with titanium (Ti6Al4V) and polyvinyl chloride (PVC). Two innovative vest configurations were evaluated following National Institute of Justice (NIJ) Standard-0101.04 ballistics tests and simulated using the Finite Element Method (FEM). Experimental findings indicated that while Vest 1 significantly absorbed impact energy, it failed to prevent projectile penetration. In contrast, Vest 2, incorporating additional titanium and polymer layers, effectively mitigated the penetration of 9 mm Full Metal Jacket (FMJ) projectiles while maintaining a safe back-face signature (BFS). The FEM simulation results demonstrated strong agreement with the experimental data, validating the effectiveness of multi-material layering in enhancing ballistic resistance. This research presents a strategic integration of titanium and polymer composites designed to achieve superior ballistic resistance while maintaining lightweight properties. These findings provide valuable insights for developing advanced body armor designs suitable for high-performance military and law enforcement applications.
Co-Authors Abdullah, Salman Faruqi Akhir, Yaummil Chairil Agoest Annisa Nur Wahyuni Annisa Nur Wahyuni Aprilia Putri Laurina Ardhi Bebi Laksono Asep Suhandi Haris Cahyo Triatmono Haryo Bisono Setyadi Hendra Jaya Tarigan Hernawan, Rendi Ida Bagus Madra Gana Ivan Junixsen Joni Welman Simatupang Lutfi Fadilah Muslimin Muslimin Muzhaffar Effendi, Nabil Naoki Matsuzuka Norbertus Krisna Aditya Utomo Putra, Bobby Salim Rendi Hernawan Sastranegara, Azhari Sugeng Sugeng Sutisna, Nanang Ali Tetuko Kurniawan Timotius, Hizkia Tirta Kumala Yoshitada Isono Zairullah Azhar