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All Journal Jurnal Rekayasa Proses Jurnal Manajemen Teknologi Jurnal Teknik ITS IPTEK The Journal for Technology and Science Jurnal Sains dan Teknologi Bulletin of Chemical Reaction Engineering & Catalysis Journal of Engineering and Technological Sciences International Research Journal of Business Studies (E-Journal) Jurnal Teknik Industri: Jurnal Keilmuan dan Aplikasi Teknik Industri Indonesian Journal of Chemistry Jurnal Rekayasa Proses International Journal of Marine Engineering Innovation and Research Jurnal Teknik Kimia Indonesia Journal of Marine-Earth Science and Technology Makara Journal of Science Makara Journal of Technology Sewagati Jurnal Teknik Kimia dan Lingkungan Jurnal Teknologi Kimia Mineral Bulletin of Chemical Reaction Engineering & Catalysis International Research Journal of Business Studies Jurnal Rekayasa Proses
Sjarief Widjaja
Chemical Engineering Department, Institut Teknologi Sepuluh Nopember, Kampus ITS Sukolilo, Surabaya 6011
Arts Humanities Automotive Engineering 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 Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Physics Public Health Social Sciences Transportation Other

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Journal : IPTEK The Journal for Technology and Science

 1 
Study of UV-B Mutation Effect on pH Resistance and Lipid Production of Microalgae Botryococcus braunii Soedarmodjo, Thea Prastiwi; Rachma, Fanina Aulia; Aparamarta, Hakun Wirawista; Widjaja, Arief
IPTEK The Journal for Technology and Science Vol 30, No 3 (2019)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v30i3.5475

Abstract

Microalgae Botryococcus braunii is a potential biodiesel producer as an alternative for fossil fuels due to its high lipid content. UV-B mutations were carried out to see the effect in microalgae growth at various pHs (3-8). Reduction of nitrogen levels was carried out to see the effect on the growth and lipid production of microalgae. UV-B mutation increased the ability of growth and resistance of B. braunii against low pH. Under low nitrogen conditions, the growth of B. braunii cells would not continue for a longer time. B. braunii which grow in nitrogen depletion medium produced lipid content greater than normal nitrogen. UV-B light mutation also increased the lipid content of B. braunii. At 7 days of incubation, the mutation not only increased lipid content, but also significantly increased the TAG content of B. braunii lipids.
Effect of Bamboo Node for Construction Application Basuki Widodo, Akhmad; Panunggal, Eko; Widjaja, Sjarief; M. Rasyid, Daniel; Soegiono, Soegiono
IPTEK The Journal for Technology and Science Vol 18, No 3 (2007)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v18i3.166

Abstract

In use of material for structure application, the most critical shares is jointed area, where this area is accumulation of stress accepted from existing burden. In structure laminate, joints represent part of drawback from the construction. And so do that happened at node in bamboo. Every part of bamboo there are node and internode. strength of bamboo with the internode will be downhill 25 % compared to bamboo without internode. In this research aim to know effect of bamboo node in construction laminate. Examination of test made with lamination without node and by node. Examination covering test of static bending and tensile strength. Standard used ASTM D-143. From result of examination and analyse, indicating that there difference between strength of wood laminate with internode and wood laminate without internode. But degradation of strength not equal to difference of strength of bamboo solid. At bamboo composite of degradation of strength only equal to 4.88 %, while wood and bamboo composites, where part of bamboo one-third from composite, degradation of strength reach 18.33 %. But degradation of the strength still fulfill conditions for structural used.
Effect of Dilute Acid Pretreatment of Vegetable Waste on Sugar Production and Inhibitor Formation Denistira Fazlur Rahman; Hakun Wirawasista Aparamarta; Arief Widjaja
IPTEK The Journal for Technology and Science Vol 31, No 1 (2020)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (331.736 KB) | DOI: 10.12962/j20882033.v31i1.5639

Abstract

Vegetable waste is an organic waste with high cellulose and hemicellulose and low lignin content. The cellulose and hemicellulose chains can be broken down by pretreatment using sulfuric acid to obtain reducing sugar. To avoid the formation of degradation products that have the potential as inhibitor compounds, the temperature of the pretreatment operation was carried out at 121 and 125 for 60 minutes with sulfuric acid concentrations varying from 0.5% to 1.5% (v/v). The solid and liquid ratio (S/L) was 5% (w/v). From the experiments, the highest total reducing sugars of 7.068 g/L was obtained by pretreatment conditions at 121 for 60 minutes with a sulfuric acid concentration of 1% (v/v). Meanwhile, the lowest total reducing sugar of 2.764 g/L was produced during the pretreatment operating conditions at 125 for 60 minutes with a sulfuric acid concentration of 1% (v/v). Under the present experimental condition, it was found that only a low level of degradation product was formed, which ensures excellent performance of bacterial growth in the subsequent fermentation process.
Preliminary Study of Reducing Sugar Production from Coconut Husk by Enzymatic Hydrolysis Using Chitosan Immobilized Crude and Commercial Cellulase Afan Hamzah; Muhammad Nurul Hakim; Baiq Firyal Salsabilla Safitri; Nurul Maziyah; Laila Nur Rahmah; Hanny F Sangian; Soeprijanto Soeprijanto; Arief Widjaja
IPTEK The Journal for Technology and Science Vol 31, No 1 (2020)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (345.31 KB) | DOI: 10.12962/j20882033.v31i1.5638

Abstract

The objective of this research was to study the production of sugar from coconut husk using immobilized crude and commercial cellulose, including temperature and mixing speed during immobilization. The enzyme from Aspergillus Niger was immobilized on chitosan alone and cross-linked with Glutaric Dialdehyde (GDA). Coconut husk waste was grinded and chemically pretreated using NaOH 1% (w/v). Fourier Transform Infrared Spectroscopy (FT-IR) measurement revealed that enzyme was covalently bonded to the support. Cellulose immobilized on chitosan cross-linked with GDA produced more sugar than immobilized on chitosan alone. Both the crude and commercial enzyme had their yield decreased after immobilization. Despite its less enzyme coupled on micro-sized chitosan, reducing sugar yielded by an immobilized enzyme on micro-sized chitosan had a competitive result with macro-sized chitosan. This may due to decreasing mass transfer resistance when using a smaller size of chitosan. Several important factors such as temperature, mixing speed, and purity of enzyme responsible for the performance of sugar produced from insoluble cellulose using cellulose immobilized on insoluble support was thoroughly discussed.
The Effect of Marine Fish Biomass Stock Reduction to Fishers Revenue (A Case Study of Sardinella Lemuru Fisheries on Bali Strait) Ratna Purwaningsih; Sjarief Widjaja; Sri Gunani Partiwi
IPTEK The Journal for Technology and Science Vol 22, No 3 (2011)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v22i3.73

Abstract

Stock assessment studies indicate that Sardinela Lemuru fisheries of Bali strait have been overfishing. This research attempts to (1) Identify the effect of biomass stock reduction to fishers revenue per trip, (2) Analyze the economic feasibility study for purse seine of Muncar, Banyuwangi. System Dynamic approach is used for simulation modeling. Simulation output shows a strong correlation between fish stock reduction and fisher revenue. The growth of fishing effort per year results on the reduction of catch per unit effort and total catch per year. Feasibility study concludes that purse seine (30 GT) which operates 120 trips per year is no longer a profitable business since 2020.
Co-Authors Achmad Chumaidi, Achmad Achmad Zubaydi Adi Soeprijanto Aditya Dwi Saputra Adrian Nur Adrian Nur Afan Hamzah, Afan Agra Bachtiar Ahmad Zubaydi Akbarningrum Fatmawati Akbarningrum Fatmawati Akhmad Basuki Widodo Al-Ghifari, Admiral Yagi Anwar, Nadiem Aparamarta, Hakun Wirawasista Aparamarta, Hakun Wirawista Apol, Tabina Raissa Ari Anggoro Arif , Irfan Syarief Artaraharja, Yoseph Daniswara Bagiyo Suwasono Bagiyo Suwasono Bagiyo Suwasono Bagiyo Suwasono, Bagiyo Baiq Firyal Salsabilla Safitri Candra Wijaya, Candra Debra Arlin Puspasari Debra Arlin Puspasari Denistira Fazlur Rahman Desi Liah Martasari Desy Nurwijayanti Dwina Moentamaria Eny Setyowati F Ferry Fadilah, Siska Nuri Firmansyah, Arfian Alwi Fredi Susanto Hanny F. Sangian Hasanudin Hellen Kartika Dewi Hellen Kartika Dewi Hermawan, Yuda Apri Heru Setyawan I Nyoman Budiantara I. Wuled Lenggoro Ilham Alamsah Ilham Alamsyah Integrity, Justian Immanuel Irfan Albana Irfin, Zakijah Irma Nurhanifah Fenda Putri Jayyid Zuhdan Junaidi Kristian Junaidy Kristian Junaidy Kristian Junianti, Fitri Kamila Adila Muslim Karima, Nur Kurniawan Candra Eka Prasetya Mamuji Putra Laila Nur Rahmah Laila Nur Rahmah Lidya Lorenta Sitompul Lieke Riadi M Musmariadi M. Rasyid, Daniel M. Zaed Yuliadi Ma'ruf, Buana Marcus Tukan Maulidarsyah, Muhammad Fauzan Muhammad Nurul Hakim Muharja, Maktum Mukti Mulyawan Nadiem Anwar Novandira, Belva Angeline Nur Fadhilah Nur Fadhilah Nurkhamidah , Siti Nurul Maziyah Nurul Maziyah Panunggal, Eko Patdono Suwignjo Pertiwi, Urania Noor Lintang Rachma, Fanina Aulia Ratna Purwaningsih Ratna Purwaningsih Ratna Purwaningsih Rizki Fitria Darmayanti Rohmah, Ika Putri Nikmatur Samsudin Affandi Sangadji, Ningsi Lick Setiyo Gunawan Silvya Yusnica Agnesty Silvya Yusnica Agnesty Silvya Yusnica Agnesty Silvya Yusnica Agnesty Siska Nuri Fadilah Siska Nuri Fadilah Soedarmodjo, Thea Prastiwi Soegiono, Soegiono Sri Gunani Partiwi Sri Gunani Partiwi Sugeng Winardi Sukma Rahma Sukma Rahma Sukmawati Rahma Tantular Nurtono Thea Prastiwi Soedarmodjo Tri Achmadi Tri Widjaja Winardi, Sugeng Yakub Hendrikson Manurung Yakub Hendrikson Manurung Yuliadi, M. Zaed Zaed Yuliadi Zaed Yuliadi, Zaed Zubaydi, Ahmad Zuhroh, Saiyyidah Tus