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All Journal Jurnal Penelitian dan Evaluasi Pendidikan Journal of Business and Management Jurnal Perikanan dan Kelautan Edulib BENTANG : Jurnal Teoritis dan Terapan Bidang Rekayasa Sipil Conference SENATIK STT Adisutjipto Yogyakarta Angkasa: Jurnal Ilmiah Bidang Teknologi Ensiklopedia of Journal Ensiklopedia Education Review Community Development Journal: Jurnal Pengabdian Masyarakat Jurnal Riset Sistem Informasi dan Teknologi Informasi (JURSISTEKNI) Jurnal Teknik Informatika (JUTIF) Jurnal Peradaban Masyarakat (JPM) Journal of Scientific Research, Education, and Technology Jurnal Teknologi dan Vokasi Nuansa: Jurnal Penelitian Ilmu Sosial dan Keagamaan Islam Journal of Health Management, Administration and Public Health Policies Hikamatzu Journal of Multidisciplinary Research Journal of Maritime Policy Science Jurnal Perikanan dan Kelautan

FAJAR NUGROHO

Jurusan Teknik Mesin STT Adisutjipto

Author-ID : 333260

Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Physics Public Health Social Sciences Transportation Other

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PENGEMBANGAN ONLINE PUBLIC ACCESS CATALOG (OPAC) BERBASIS ANDROID PADA PERPUSTAKAAN UPN â€œVETERANâ€ JAKARTA Nugroho, Fajar; Muljono, Pudji; Hermadi, Irman
Edulib Vol 7, No 2 (2017)
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/edulib.v7i2.9196

Abstract. UPN "Veteran" Jakarta Library wants to keep abreast of information technology development that can improve library quality. Smartphone with android operating system nowadays is one of knowing information technology that developed rapidly. The advantages of smartphones using android operating system is the ability to run multiple applications simultaneously, ease of access, and has a relatively cheap price with a lot of functions. The UPN "Veteran" JakartaLibrary currently has limitations in providing a collection search facility due to the less roomy space, the cost of electricity, and also the ergonomics of the device. Online Public Access Catalog (OPAC) or that can be known byonline catalog is a useful facility for the user and library in providing the means. Development OPAC withandroid-basedis expected to provide solutions to problems that can help users and also UPN "Veteran" JakartaLibrary in providing excellent service. In this research article will be presented about the stages of OPAC with android-bases development in UPN "Veteran" Jakarta Library by using System Development Life Cyle (SDLC) method. From the result of the research, it is concluded that thedevelopment of OPAC with android-bases in UPN "Veteran" Jakarta Library has been able to provide ten parameters of OPAC third generation. With the android-based OPAC is expected to help the user infinding the collection with the limitations of the search facilities provided by UPN "Veteran" Jakarta as well as providing variations in searching collection at OPAC library UPN "Veteran" Jakarta.Keywords: Development, OPAC, Android

PENGARUH RAPAT ARUS ANODIZING TERHADAP NILAI KEKERASAN PADA PLAT ALUMINIUM PADUAN AA SERI 2024-T3 Nugroho, Fajar
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 7, No 2 (2015): November
Publisher : Sekolah Tinggi Teknologi Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (224.803 KB)

Aluminum alloy AA 2024-T3 is widely applied in the aircraft industry because it has good mechanical properties such as; light weight, good conductivity and the corrosion resistance. However Aluminium 2024-T3 susceptible to wearing. One method to improve the wear resistance o f AA 2024-T3 is the anodizing process. The aims of this research to study the effect of current density and anodizing time against the hardness of aluminum alloy AA 2024-T3. The process of anodizing was carried out using 10 percent sulfuric acid solution with the current density of 1.5 Ampere per decimeters square, 3.0 Ampere per decimeters square and 4.5 Ampere per decimeters square with immersion times of 30, 40, 50 and 60 minutes. Furthermore, the surface hardness was measured by using the Vickers hardness test method. As the supporting data the composition of the test conducted, testing the microstructure, and vickers hardness test. This study shows that the surface hardness of aluminum alloy AA 2024-T3 is influenced by the current density and anodizing time with varying values. Its shows that higher current density o f the anodizing caused optimal time tends to be short. The longer anodising time it will produce greater layer of aluminum oxide.

STUDI KOMPARASI PENGARUH VARIASI ARUS PENGELASAN TERHADAP KEKUATAN IMPAK, KEKERASAN, DAN STRUKTUR MIKRO SAMBUNGAN LAS PEGAS DAUN BAJA SUP 9 PADA PROSES LAS SMAW Nugroho, Fajar
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 9, No 2 (2017): November
Publisher : Sekolah Tinggi Teknologi Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (234.775 KB)

Abstract Spring is a component that functions to receive dynamic load and providescomfort in driving. The problem is the leaf spring is sometimes broken due to theoverload or unfavorable road conditions. The solution for that problem is grafting using the SMAW welding.This study aims to determine the effect of variations in the welding currentto the impact strength, hardness and microstructure. Types of weld used is SMAW with a variety of welding current of 100 A, 120 A and 140 A and the type of seam used is the type of seam V.The highest impact strength test was 1.698 j/mm2at 100 A and the highest hardness test was 355.338 HVN at 140 A. In addition, the micro structure at the welding area has bigger grain size and more pearlite structure at 140 A. Keywords: welding current, impact strength, hardness, micro structureÂ AbstrakPegas adalah suatu komponen yang berfungsi untuk menerima beban dinamis dan memberikan kenyamanan dalam berkendara. Permasalahan yang sering dialami oleh pegas daun adalah patah akibat beban lebih atau kondisi jalan yang kurang baik. Penanganan pada hal seperti ini adalah penyambungan menggunakan las SMAW.Penelitian ini bertujuan untuk mengetahui pengaruh variasi arus pengelasan terhadap kekuatan impak, kekerasan dan Struktur mikro. Jenis las yang digunakan adalah las SMAW. Variasi arus pengelasan yang digunakanadalah 100 A, 120 A dan 140 A. Jenis kampuh yang digunakan adalah jenis kampuh V.Hasil uji kekuatan impak tertinggi diperoleh pada variasi arus 100 A yaitu sebesar 1,698 J/mm2. Hasil uji kekerasan tertinggi diperoleh pada variasi arus 140 A yaitu sebesar 355,338 HVN. Struktur mikro pada daerah las memiliki ukuran butiran yang semakin besar dan struktur perlit yang semakin banyak untuk variasi arus 140 A.Kata kunci: arus pengelasan, kekuatan impak, kekerasan, struktur mikro

PENGARUH KANDUNGAN PARTIKEL SERBUK GENTENG SOKKA TERHADAP KEKUATAN TARIK DAN KEKUATAN IMPAK PADA KOMPOSIT BERMATRIKS EPOXY Nugroho, Fajar
SENATIK STT Adisutjipto Vol 3 (2017): Dukungan Teknologi Untuk Pengembangan Industri Dirgantara Indonesia
Publisher : Sekolah Tinggi Teknologi Adisutjipto

Abstract— Composites consist of two or more separate materials combined in a macroscopic structure. This is different from alloy which is the structural unit is formed microscopiccally. At this research, the composite reinforcement was made of sokka Kebumen powder tile using epoxy formatrix. The percentage variations of volume fraction are 0%, 10%, 20%, 30%, and 40% with a mesh size of 180-200 mesh. This study aims to determine the tensile strength, impact strength, and SEM. The method used during the manufacturing process of composite was vacum molding. The tensile strength test showed the highest value was at 10% volume fraction with 49,946 MPa. The lowest value was at 40% volume fraction with 27,618 MPa. The impact strength test showed the highest value was at 10% volume fraction with 0,03925 J/mm2. The lowest value was at 40% volume fraction with 0,03375 J/mm2. The higher the percentage volume fraction of sokka tile powder, the lower the tensile strength and the impact strength of the composites have. The SEM test showed that there was still pull out at the side. Keywords: sokka tile powder, epoxy, volume fraction, composite.

Study on the Effect of Post Weld Heat Treatment (PWHT) Time on the Tensile Strength and Hardness of TIG Weld Joint of Motorcycle Crankcase Nugroho, Fajar
SENATIK STT Adisutjipto Vol 4 (2018): Transformasi Teknologi untuk Mendukung Ketahanan Nasional [ ISBN 978-602-52742-0-6 ]
Publisher : Sekolah Tinggi Teknologi Adisutjipto

Postweld heat treatment (PWHT) is a common practice among building codes to reduce the residual stress, improve the ductility, and decrease the defects. This article describes the welding joint property of motorcycle crankcase material by taking tungsten inert gas (TIG) welding measures before PWHT on 200°C with holding time of 0,4,6, 8 hours. Test data were analyzed in relation to tensile strength, hardness and microstructure on the welding joint. The regions corresponding to the base metal (BM) and heat-affected zone (HAZ) were studied. The effect of holding time under PWHT on properties of joints can be investigated. The results demonstrated that micro-hardness in the weld and tensile strength decreased with PWHT time prolonging, while tensile strength increased with the extension of PWHT time. The microstructure before PWHT was coarse in the joint. With the extension of holding time under PWHT, the structure obtains fine grain and the characteristic becomes obvious.

STUDI PENGARUH PROSES MANUFAKTUR KOMPOSIT BERMATRIK EPOKSI TERHADAP KEKUATAN TARIK DAN IMPAK PADA KOMPOSIT HYBRID BERPENGUAT SERBUK KAYU ALBASIA DAN SERAT GELAS Nugroho, Fajar
SENATIK STT Adisutjipto Vol 2 (2016): Peran Teknologi dan Kedirgantaraan Untuk Meningkatkan Daya Saing Bangsa
Publisher : Sekolah Tinggi Teknologi Adisutjipto

A composite material is very efficient to use at a structure which needs a combination between strength and stiffness and light weight. The advantage of composite material compared to a metal is corrosion resistance, accessible, and reasonable price. This study aims to determine the tensile and impact strength composites of the epoxy matrix composite reinforced by glass fiber and albsia sawdust.The composites were made using variations of stirring time 15 minutes and 30 minutes with a stirring speed of 658 rpm and 858 rpm. The composite were made using variations of the drying temperatures 40ºC, 50ºC, 60ºC, 70ºC, and the room temperature. The reinforced materials is used albasia sawdust and woven glass fiber. The matrix was Epoxy Resin Bakelite EPR 174 and Epoxy Hardener V-140. The methodology for making the composite test specimens particles was hand lay-up (open mold). The highest tensile strength testing on a composite was 37.92 MPa with a stirring time of 30 minutes and 858 rpm stirring rotation. For the impact testing, the highest visible impact at 0.0024 J/mm² in the composite with a stirring time of 15 minutes and 858 rpm stirring rotation. Through this test, it was obtained the highest tensile strength of 43.03 MPa in the composite with 50ºC drying temperature variation. Meanwhile, the composites with 60ºC drying temperature variation had the highest impact strength with a value of 0.0037 J/mm². The composite material composition and morphology of the fracture were analyzed by SEM observation.

Effects of Calsium Carbonat on Hardness and Wear Behaviour of Brass-Epoxy Brake Lining Pad. Nugroho, Fajar
SENATIK STT Adisutjipto Vol 5 (2019): Peran Teknologi untuk Revitalisasi Bandara dan Transportasi Udara [ISBN XXX-XXX-XXXXX-
Publisher : Sekolah Tinggi Teknologi Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/senatik.v5i0.314

Brake lining pad is important in driving safety. It must be able to stop the vehicle as quickly as possible. Calcium carbonate is The purpose of this study was to identify the effect of calcium carbonate to the brake brass-epoxy lining pad. Calcium carbonate meet have good physical properties, such as having low porosity and fine particles while brass has a good heat conductor and is corrosion resistant so it is resistant to heat. The tests carried out on brake pads include wear and hardness tests. The results showed that the optimal wear rate in a dry state (40% calcium carbonate-20% brass-40% epoxy) was 0.0352 mm²/kg. While the wear rate in wet conditions (20% calcium carbonate-40% brass-40% epoxy) was 0.0396 mm²/kg. The hardness brake lining pad (20% calcium carbonate - 40% brass -40% epoxy) was 176.44 kg/mm².

Corporate Value Estimation of PT Sri Rejeki Isman Tbk Nugroho, Fajar; Damayanti, Sylviana Maya
Journal of Business and Management Vol 4, No 8 (2015)
Publisher : Journal of Business and Management

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (285.473 KB)

Abstract. Indonesia has the second largest export market share among Southeast Asia Region on textile exports which is 28.5% or 4.6 billion US dollar and 18.3% or 7.7 billion US dollar on garment exports. One of the biggest textile and garment factories is PT Sri Rejeki Isman Tbk. PT Sri Rejeki Isman Tbk had strategy to expand its business in the following year. The strategies will drive greater sales with the consequences that expenses go up as well. The Company needs to do corporate valuation due to know the company share price so the company can choose the appropriate strategy to expand the business.The valuation methods used in this research are Asset based method, Market approach, and Discounted Cash Flow valuation. The outcome of this research is that the share price of PT Sri Rejeki Isman Tbk is undervalued based on valuation method. The assets-based approach showed the book value price per share is US$ 0.0158 (IDR 195.99). Market based approach showed the book value price per share is US$ 0.0131 (IDR 162.91). Comparing to the current market value price per share at the end of 2014, which is IDR 163, the stock performance is undervalue. And also based on Discounted Cash Flow method, the market price is undervalued. PT Sri Rejeki Isman Tbk, should increase the free cash flow and decreasing the cost of capital. PT Sritex should increasing the operating income and/or decreasing change in net working capital and net capital expenditure.Â Keywords: valuation, company valuation, textile, garment, share price, discounted cash flow, asset based approach, market approach

INFLUENCE OF PANDANUS TECTORIUS LEAF FIBER ON MECHANICAL PROPERTIES AND MORPHOLOGY OF POLYPROPYLENE COMPOSITE Nugroho, Fajar; Sudarmanto, Sudarmanto
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 12, No 1 (2020): Mei
Publisher : Sekolah Tinggi Teknologi Adisutjipto

Natural fiber reinforced polymer composites are widely developed because of their relative low price and eco-friendly. One of natural fiber sourches is pandanus tectorius leaf. This study aimed to determine the effect of variations in fiber volume fraction on tensile strength, impact strength, bending strength and morphological on sea pandanus fibers- polypropylene composites.Tensile test spesimen refer to ASTMD 638, impact test spesimen refes to ASTMD 5942-96, bending test spesimen refer to ASTMD 790 -02. The increasing of the volume fraction increased the tensile strength and impact strength. The tensile test results showed the highest tensile strength results for composites with a volume fraction of 35% was 25.82 MPa. The impact test results showed that the highest impact strength was obtained in the 35 % volume fraction of 0.0062 Joule/mm2. The bending test results showed that the highest bending strength was obtained in the 20% volume fraction of 24.96 MPa. Based on SEM test results, there were voids, cracks, fibers pull out on the composite.

SISTEM REKOMENDASI PRODUK UKM DI KOTA BANDUNG MENGGUNAKAN ALGORITMA COLLABORATIVE FILTERING Nugroho, Fajar; Ismu Rahayu, Mina
Jurnal Riset Sistem Informasi dan Teknologi Informasi Vol 2 No 3 (2020): JURNAL RISET SISTEM INFORMASI DAN TEKNOLOGI INFORMASI (JURSISTEKNI)
Publisher : Universitas Nusa Putra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.2005/jursistekni.v2i3.63

Sistem rekomendasi produk UKM (UKM Recmarketing) di kota Bandung menggunakan algoritma collaborative filtering merupakan aplikasi yang dapat mengorganisir, menginformasikan dan mempromosikan produk â€“ produk dari UKM serta merekomendasikan item berdasarkan kemiripan antar user yang telah melakukan pembelian produk. Metodologi pembangunan perangkat lunak menggunakan metode Extreme Programming (XP) terhadap masalah yang timbul pada pengorganisasian UKM dan pemasaran produk serta rekomendasi produk. Aplikasi terbagi menjadi 2 bagian yaitu web server sebagai pusat data dan aplikasi android untuk pengguna client mobile. Aplikasi ini menggunakan sebuah framework Code Igniter (CI) dari sisi web servernya dan web services API (Application Programming Interface) yang digunakan yaitu Restful serta dari sisi androidnya menggunakan bahasa pemrograman Java, adapun dari pertukaran data antara client dengan server menggunakan JSON untuk mendukung kinerja sistem sehingga resiko operasional dapat berkurang. Adapun aplikasi nantinya akan memudahkan para UKM untuk memasarkan produk â€“ produknya dengan lebih mudah, dengan data produk yang lebih teroganisir dan memudahkan kepada para customers untuk mencari produk dan menemukan produk yang dibutuhkannya serta customers mendapatkan penawaran â€“ pewaran diskon.

Co-Authors abdul haris subarjo, abdul haris Agamuddin, Agri Americo Andrano, Reza Anisya Anisya Anzani, Luthfi Arman A Arman A, Arman A Dedet Hermawan Setiabudi, Dedet Hermawan Djarot Wahju Santoso Eli Kumolosari Fadhil Azman, Hanif Fajrin, Fajrin Fakhrizal Fakhrizal, Fakhrizal Freddy Kurniawan Hamdeni Medriosa Hasidu, La Ode Abdul Fajar Indra Warman Irfansyah, Rahmat Irman Hermadi ISKANDAR Isror, Maizul Jafril Tanjung, Jafril Kurniawan, Muh. Firdaus Agung Kunto Kusumawardani, Mawar Laia, Dominikus Yoeli Wilson Mahardhika, R. Hernan Maidiawati Maidiawati, Maidiawati Maizetri, Resti Maizir Maizir Mentemas, Abelia Minarni Minarni Minsaris, La Ode Alam Misbah Misbah Mulyati Mulyati Mutawakkil Nurcahyani Dewi Retnowati Octavia, Dyla Midya Okto Dinaryanto Pinandhita, Lazuardy Rahendra Pudji Muljono Rahardjo, Cakra Rahayu, Mina Ismu Ratna Rinaldi, Donni Rore, Idrus Ruddy Kurniawan Shivani, Nifla Juniar Sudarmanto Sudarmanto, Sudarmanto Suyuti Sylviana Maya Damayanti Tadoda, Mersy Marselyna Teguh Wibowo Triwibowo, Nur Ahmad Wilujeung, Alya Dina

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