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All Journal Jurnal Sains dan Seni ITS IPTEK Journal of Proceedings Series IPTEK The Journal for Technology and Science TELKOMNIKA (Telecommunication Computing Electronics and Control) Jurnal Teknik Kimia Bulletin of Chemical Reaction Engineering & Catalysis Program Kreativitas Mahasiswa - Teknologi Dinar: Jurnal Ekonomi dan Keuangan Islam PROSIDING SEMINAR KIMIA Indonesian Journal of Chemical Science Jurnal Kimia Terapan Indonesia Indonesian Journal of Chemistry Akta Kimia Indonesia Prosiding Seminar Nasional Sains dan Teknologi Terapan IJIEEB : International Journal of Integrated Education, Engineering and Business Proceeding of World Conference Portal: Jurnal Teknik Sipil Journal of Tropical Marine Science Indonesian Journal of Electrical Engineering and Computer Science Molluca Journal of Chemistry Education (MJoCE) Narotama Jurnal Teknik Sipil International Journal of Engineering, Science and Information Technology Halal Research Journal Jurnal Konseling Pendidikan Islam Bulletin of Chemical Reaction Engineering & Catalysis JURNAL NERACA

Fredy Kurniawan

Institut Teknologi Sepuluh Nopember

Author-ID : 301845

Religion Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry 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 Industrial & Manufacturing Engineering Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Physics Social Sciences Transportation Other

Published : 51 Documents Claim Missing Document

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Articles

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Value Engineering Construction Of The Unisa Campus Saintek Building 2 Ramadhana Sangyang Ady; Fredy Kurniawan; Diah Ayu Restuti Wulandari
Journal of World Conference (JWC) Vol. 3 No. 5 (2021): September 2021
Publisher : NAROTAMA UNIVERSITY, Indonesia

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

This Value Engineering analysis is carried out to analyze or organize a construction of the SAINTEK UINSA 2 building which aims to produce appropriate quality that does not change the function and also there are no unnecessary costs considering that the construction of this building has a building area of ??40 x 19 = 760 m2 which cost Rp. 37,108.056,260.81. In this analysis, an analysis is carried out or to identify the function of a product or service that aims to fulfill the required function at the lowest price by providing an alternative from the creative ideas obtained to give to the owner so that there is no need for an increase in costs. From the VE analysis on the construction of the SAINTEK UINSA 2 building, the total initial cost savings on the slab work were initially Rp. 624,429,524.15 and after applying Value Engineering analysis using alternative 2, the cost is Rp. 527,876,352.19 which is more economical worth Rp. 96,553,171.96 or 15.46% of the initial price. On the 1st floor work (1st floor ) EL. -0.05 in which there is a formwork slab which is considered to have a high cost, which initially used nails and wooden blocks, which was changed to 50.50 hollow iron and bendrat wire.

Construction Safety Planning Method Based on Project Loan ( Lot 8 Jarit-Puger Road Project Case Study) Galuh Tiara Dewi; Fredy Kurniawan
Journal of World Conference (JWC) Vol. 4 No. 1 (2022): Januari 2022
Publisher : NAROTAMA UNIVERSITY, Indonesia

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

The development of infrastructure in Indonesia has increased with the implementation of national strategic projects. With the increasing growth of infrastructure development in Indonesia and the increasing number of work-related accidents on the site. Accidents at work occur because of the lack of attention to implementation and monitoring. The success of the project is not measured merely in terms of performance, but in the application of occupational safety and health to a project and becomes one of the benchmarks for success. To control the implementation of Occupational Safety and Health in the project, a Construction Safety Plan is required, while compiled in the Construction Safety Plan document included in the Construction Safety Management System document. The research methodology used data collected in the field. Collect data from implementation case studies and comparisons related to construction safety planning documents against applicable regulations through field observations using documentation, questionnaires, observations and documentation methodology. Based on the analytical results conducted in this study, there are five elements to prepare the construction safety plan documents. Reduce the number of work-related accidents by planning, monitoring, and evaluating work-related accidents. There is an expectation that further analysis of the factors that cause work accidents by adding research objects to reduce work accidents in construction projects. For the analysis, the authors hope that the causes of industrial accidents will be more detailed by adding research topics to reduce accidents in construction projects.

Novel pH sensor based on fiber optic coated bromophenol blue and cresol red Fredy Kurniawan; Baginda Zulkarnain; Mohammad Teguh Hermanto; Hendro Juwono; Muhammad Rivai
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 17, No 2: April 2019
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v17i2.9993

Fabrication of pH sensor based on fiber optic coated bromophenol blue and cresol red has been done. Briefly, jacket in the middle part of the fiber optic was removed for 5 cm. Then the core of each of fiber optics was washed in ethanol. Nitric acid, demineralized water, and ethanol again consecutively. Then the cleaned core was coated using active material using sol-gel immobilization technique. Tetraehyl orthosilicate was used as a binder in the immobilization of active materials. Bromophenol blue will start change the color to yellow at below pH 3.00±0.01 and blue at above pH 4.60±0.01, while the cresol red will start change the color to yellow at below pH 7.20±0.01 and violet at above pH 8.80±0.01. The pH sensors which have been made show the sigmoidal response over pH from 1.00±0.01 to 11.00±0.01. The sensor has a better performance in comparation with the other sensor.

Quartz crystal microbalance based electronic nose system implemented on Field Programmable Gate Array Misbah Misbah; Muhammad Rivai; Fredy Kurniawan
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 17, No 1: February 2019
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v17i1.10133

Nowadays, an electronic nose becomes an important tool for detecting gas. The electronic nose consists of gas sensor array combined with neural networks to recognize patterns of the sensor array. Currently, the implementation of the neural network on the electronic nose systems still use personal computer so that less flexible or not portable. This paper discusses the electronic nose system implemented in a Field Programmable Gate Array (FPGA). The sensor array consists of eight Quartz Crystal Microbalance (QCM) coated with chemical materials. The eight channel-frequency counter is used to measure the frequency change of the sensor due to the presence of gas adsorbed to the surfaces. The bipolar sigmoid activation function used in the neuron model is approximated by a second order equation. The experimental result showed that the electronic nose system could recognize all the types of gas with 92% success rate.

Fabrikasi Alat Ukur Sudut Kontak Dual Channel Untuk Mengetahui Sifat Polaritas Suatu Bahan Wahyu Anggriawan; Fredy Kurniawan
Jurnal Sains dan Seni ITS Vol 4, No 1 (2015)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat (LPPM), ITS

Pada penelitian ini telah dibuat alat ukur sudut kontak dengan modifikasi dual channel. Pengujian kinerja alat dilakukan dengan mengukur nilai sudut kontak dan diameter tiga bahan padat (politetrafluoroetilen, polivinilklorida dan polimetilmetakrilat) dan bahan cair (akua demineralisasi, etanol dan toluen) yang masing-masing memiliki nilai momen dipol berbeda. Hasil pengujian kinerja alat menunjukkan nilai sudut kontak 118,783° yang sesuai dengan rentang nilai standar alat (108-125°) pada ASTM C813-90. Hasil pengukuran pada bahan air-PTFE (θ=118,783°, D=0,260 cm), air-PVC (θ=83,196°, D=0,311 cm), air-PMMA (θ=74,468°, D=0,340 cm), etanol-PTFE (θ=52,351°, D=0,320 cm) dan toluen-PTFE (θ=40,204°, D=0,366 cm) diperoleh nilai sudut kontak yang berbeda pada diameter yang berbeda. Nilai sudut kontak air pada PTFE paling tinggi dibandingkan dengan etanol dan toluen sesuai dengan besar nilai momen dipol yang dimiliki

Deteksi Gelatin Babi Menggunakan Sensor Emas Termodifikasi NiO nanopartikel pada Quartz Crystal Microbalance Ari Nugroho; Fredy Kurniawan
Jurnal Sains dan Seni ITS Vol 4, No 2 (2015)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat (LPPM), ITS

Sensor emas terlapis NiO nanopartikel pada probe Quartz Crystal Microbalance (QCM) telah berhasil dibuat. NiO nanopartikel dilapiskan pada permukaan sensor emas QCM berfungsi sebagai partikel aktif. Sensor emas QCM yang telah termoifikasi NiO nanopartikel dipasang pada crystal holder dan dicelupkan pada larutan gelatin sapi dan larutan gelatin babi dengan konsentrasi 100, 200, 300, 400, dan 500 ppm untuk menguji perbedaan frekuensi yang teramati pada larutan gelatin sapi dan larutan gelatin babi.

DETEKSI GELATIN BABI MENGGUNAKAN EMAS TERMODIFIKASI Ni(OH)2 NANOPARTIKEL DENGAN QUARTZ CRYSTAL MICROBALANCE (QCM) Lourentia Candle; Fredy Kurniawan
Jurnal Sains dan Seni ITS Vol 4, No 2 (2015)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat (LPPM), ITS

Sensor Quartz emas dari QCM (Quartz Crystal Microbalance) yang terlapis senyawa Nanopartikel Ni(OH)2 telah berhasil dibuat. Senyawa Nanopartikel Ni(OH)2 disintesis dengan menggunakan metode pengendapan. Pada pelapisan senyawa Nanopartikel Ni(OH)2 pada Quartz emas dari QCM dilakukan bantuan Polimer Konduktif Polianilin dengan metode voltametri siklik. Pelapisan senyawa Nanopartikel Ni(OH)2 pada Quartz emas dari QCM dengan metode layer by layer. Pengujian dilakukan dengan variasi konsentrasi (100 ppm, 200 ppm, 300 ppm, 400 ppm, 500 ppm) dan variasi pH (pH 7, pH 4, dan pH 9) dari larutan gelatin. Gelatin Sapi dan Gelatin Babi dapat dibedakan dengan menggunakan sensor QCM yang telah termodifikasi ini pada pH larutan Basa (pH 9). Kata Kunci : Quartz Crystal Microbalance (QCM), Senyawa Nanopartikel Polianilin, Polimer Konduktif Ni(OH)2, Voltametri Siklik, Elektrolisis, Gelatin, Sapi, dan Babi

Pengaruh Waktu Infusi Pada Kadar Asam Klorogenat Dalam Sampel Teh Hitam dan Teh Hijau Silvya Anggraini; Fredy Kurniawan
Jurnal Sains dan Seni ITS Vol 4, No 2 (2015)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat (LPPM), ITS

Pada penelitian ini pengaruh waktu infusi pada kadar asam klorogenat dalam sampel teh hijau dan teh hitam hasil pengolahan kebun teh Lawang telah berhasil dianalisis menggunakan spektrofometer UV VIS. Pengukuran asam klorogenat dilakukan berdasarkan waktu infusi yaitu dari menit ke 0 sampai dengan menit ke 30 dengan interval waktu 5 menit. Kadar asam klorogenat dalam sampel teh hitam pada tiap waktu infusi adalah 117,4569 mg/g (0 menit), 157,1031 mg/g (5 menit), 165,6275 mg/g(10 menit), 170,1532 mg/g (15 menit), 1787,9327 mg/g (20 menit), 168,1327 mg/g (25 menit), 140.7965 mg/g (30 menit) dan pada sampel teh hijau terukur 130.3195 mg/g (0 menit), 144.065 mg/g (5 menit), 154.7676 mg/g (10 menit), 168.468 mg/g (15 menit), 162.5686 mg/g (20 menit), 165.0445 mg/g (25 menit), 157.8896 mg/g (30 menit). Untuk waktu yang lebih lama maka kadar asam klorogenat akan semakin menurun. Waktu infusi maksimum untuk teh hitam adalah 20 menit dan 15 menit untuk teh hijau.

PenggunaanAgar-agar Komersial sebagai Media Gel Elektroforesis Pada Zat Warna Remazol : Pengaruh Komposisi Buffer, pH Buffer dan Konsentrasi Media DraIta Ulfin; Fredy Kurniawan; Atik Rohmana Maftuhatul Fuad
Jurnal Sains dan Seni ITS Vol 5, No 2 (2016)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat (LPPM), ITS

Abstrak—Elektroforesis gel menggunakan media agar-agar komersial untuk zat warna remazol telah dilakukan. Agar-agar komersial digunakan sebagai alternatif media elektroforesis gel untuk zat warna remazoBrilliant Blue R, Red RB, Yellow FG, Turquoise Blue G dan Violet 5R dengan beberapa variabel optimasi elektroforesis gel antara lain : pengaruh komposisi buffer, pH buffer, dan konsentrasi media yang dilakukan pada tegangan 150 volt selama 15 menit. Kemudian diperoleh kondisi optimal menggunakan buffer dengan komposisi NaH2PO4.H2O + Na2HPO4. Pada pH buffer 9 didapatkan jarak migrasi terjauh untuk masing-masing zat warna RBBR, RYFG, RRRB, RTBG dan RV5R secara berturut-turut adalah : 29,11 mm; 35,40 mm; 33,40 mm; 32,07 mm; dan 31,07 mm. Pada konsentrasi 2% didapatkan jarak migrasi untuk kelima zat warna remazol paling jauh, yaitu : RBBR 29,13 mm; RYFG 34,14 mm; RRRB 31,16 mm; RTBG 30,25 mm dan RV5R 29,20 mm.

Pemanfaatan Nata de Coco sebagai Media Gel Elektroforesis Pada Zat Warna Remazol : Pengaruh pH, Waktu dan Aplikasi pemisahan gelatin Lutfi Andre Yahya; Ita Ulfin; Fredy Kurniawan
Jurnal Sains dan Seni ITS Vol 5, No 2 (2016)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat (LPPM), ITS

Nata de coco telah digunakan sebagai pengganti media gel elektroforesis pada sampel pewarna remazol. Pada penelitian ini, diamati pengaruh pH larutan buffer, waktu elektroforesis dan aplikasi pemisahan gelatin menggunakan elektroforesis dengan media nata de coco. Nata de coco yang berumur 4 hari memiliki ketebalan yang sesuai yaitu 0,454 cm dan waktu inkubasi yang tidak terlalu lama sehingga umur tersebut digunakan dalam penelitian ini. Hasil resolusi elektroforesis terbaik didapatkan pada pengggunaan buffer fosfat yang terbuat dari garam–garamnya. Pada pengaruh pH dinyatakan dengan kekuatan ion, dimana semakin besar kekuatan ion larutan, maka semakin jauh jarak migrasi remazol. Lama waktu elektroforesis mempengaruhi jarak migrasi remazol Kondisi optimum elektroforesis gel menggunakan nata yang didapat, digunakan untuk uji pemisahan gelatin menggunakan pewarna remazol turquoise dan didapatkan dua pita pemisahan dengan jarak pita masing-masing 2 cm dan 3,6 cm.

Co-Authors ., Syukrianto ., Umarudin Abdullah Aman Damai Adi Prawito Adi Soeprijanto Alvin Juniawan Anang Maryanto Anggriawan, Wahyu Ari Nugroho Arif Rachmat, Arif Arynta Dharmayanti, Arynta Atik Rohmana Maftuhatul Fuad Baginda Zulkarnain Bagus, Muhammad Bahrul Ulum Dennis Farina Nury Diah Ayu Restuti Wulandari Diah Susanti Dipta Nusbangga, Dipta Djarot Sugiarso Endang Tri Wahyuni Endang Tri Wahyuni Erna Rochana Estu Yoga Elmi Gesa Febri Hadi Fitriyana Fitriyana Fransisca Bangun, Yulia Frizka Vietanti Fuji Ridha, Fuji Galuh Tiara Dewi HANGGARA, ANGGY YOGA Hariyati Purwaningsih Harmami Harmami Harus Laksana Guntur Hatta, Agus Muhamad Hendro Juwono Hendro Juwono Hendro Sutowijoyo Ika Puspita, Ika Ikhsan Setiawan Imam Abadi Isa, Illyas Md Ismail Azizi Ita Ulfin Julistyana Tistogondo Karlinda Karlinda Kartika A. Madurani Kaskoyo, Hari Koespiadi Kolo, Maria Magdalena Lia Marisca Permatasari Lourentia Candle Lutfi Andre Yahya Madurani, Kartika Anoraga Mahendra Wardhana, Mahendra Mega Vania Misbah Misbah Mochammad Zaki Nasrulloh Mohammad Teguh Hermanto Muhammad Alwi Syahara, Muhammad Alwi Muhammad Rivai NUR EFENDI Nyoman Agus Sandika Purnaman Pemal Kabogi Praditya Bagaskara Qonitah Fardiyah Rahadian Zainul Rahmi Rahmi Ramadhana Sangyang Ady Regina Tutik Padmaningrum Rika Wijiyanti, Rika Romadhona, Syahrur Rooslan Edy Santosa Sayyida Sayyida Sekartedjo Koentjoro, Sekartedjo Selvi Marcellia Setyadi Laksono Bahar Silvya Anggraini Sri Wiwoho Mudjanarko, Sri Wiwoho Suharmanto, Edi Sunarto Sunarto Suprapto Suprapto Suprapto, Suprapto Sutarno Sutarno Sutarno Sutarno Suyanta Suyanta Syahputra, Muhammad Yudha Syukrianto, Syukrianto Taslim Ersam Tri Paus Hasiholan Hutapea, Tri Paus Hasiholan Tri Widjaja Triyono Triyono Triyono Triyono Umarudin, Umarudin Vietanti, Frizka Wahyu Anggriawan Yunita Triana Yunita Triana Zulkarnain Zulkarnain

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