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Tangguh Okta Wibowo
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Gedung Lengkung, Unit 1, Lantai 2, Sayap Timur Sekolah Pascasarjana Universitas Gadjah Mada Jalan Teknika Utara, Pogung, Sleman- Yogyakarta Telp. (0274-564239 extc. 207)
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Jurnal Teknosains
Published by Universitas Gadjah Mada
ISSN : 20896131     EISSN : 24431311     DOI : https://doi.org/10.22146/teknosains.xxxx
Core Subject : Science, Engineering,
Biochemistry, Genetics & Molecular Biology Civil Engineering, Building, Construction & Architecture Industrial & Manufacturing Engineering Mechanical Engineering
Jurnal Teknosains is a peer-reviewed journal which began publication in 2011, and published each semester in June and December. It is a series of scientific publications in engineering, science and technology area. Jurnal Teknosains aims to encourage research in Science and Technology studies. Topics addressed within the journal include but not limited to: Engineering, which is divided into several topics: Mechanical Engineering, Industrial Engineering, Biomedical Engineering, Chemical Engineering, Nuclear and Physical Engineering, Civil Engineering, and Planology. Basic Sciences, which is divided into: Chemistry and Physics Health Sciences, which is divided into: Medical, Biotechnology specially in Health Science, and Dentistry
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 8 Documents
 1 
Search results for , issue "Vol 8, No 2 (2019): June" : 8 Documents clear
STUDI PENGARUH JARI-JARI DALAM MAGNET TERHADAP TEGANGAN GENERATOR AKSIAL PADA BAHAN CAKRAM AKRILIK Pebri Prihatmoko; F. Danang Wijaya; Suharyanto Suharyanto
Jurnal Teknosains Vol 8, No 2 (2019): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.30958

Abstract

The high cost of making rotor discs is one aspect that becomes an obstacle in the implementation of axial generator research. This study aims to compare acrylic discs with wooden discs in terms of axial generator output voltage and production costs, so that further research can use alternative discs with lower cost. This study uses an experimental method, where this method is used to find existing variables. On a generator with an acrylic disc, the average voltage is 16.6 volts with a manufacturing cost of 151,500 rupiah. Whereas on generator with wood disc, the average voltage is 17.2 volts with a manufacturing cost of 48,750 rupiah. Thus wood disc can be an alternative material in making cheap axial generator rotor discs.
EFEKTIFITAS PENAMBAHAN MEDIA GEOTEKSTIL PADA SARINGAN PASIR LAMBAT TERHADAP PENYISIHAN PARAMETER KEKERUHAN, JUMLAH COLI DAN COD Yustika Kusumawardani; Widi Astuti
Jurnal Teknosains Vol 8, No 2 (2019): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.31917

Abstract

Slow sand filter processing is done by separating raw contaminant water which is passed slowly on sand. Fluctuating raw water quality resulted in the schmutzdecke layer not growing optimally. Therefore, it is needed media that help the performance of the sand filter. One of the media used is geotextile. The geotextile is useful as a medium to optimize the growth of microorganisms in the schmutzdecke layer. Geotextiles have similar surface structures such as sand filters as well as their pores. The purpose of this study was to determine the effectiveness of adding geotextiles in reducing turbidity parameters, number of coli and COD. This study used slow sand filter reactor with a continuous flow system of 0.3 m3 / m2.jam for 7 days. Based on the research, the addition of geotextile media is quite effective and can improve the performance of slow sand filter. Percentage of turbidity removal reached 94.27%, coli 99.40% and COD 92.85%. COD values tend to be dynamic as raw water conditions. Geotextiles is quite helpful in growing a layer of schmutzdecke because the structure resembles sand so as to increase the number of bacteria bed filters.
PEMODELAN SEBARAN BOD DI SUNGAI KAPUAS KECIL BAGIAN HILIR MENGGUNAKAN WASP Rizki Purnaini; Sudarmadji Sudarmadji; Suryo Purwono
Jurnal Teknosains Vol 8, No 2 (2019): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.34921

Abstract

The Kapuas Kecil River must be maintained for its water quality so that it can still be utilized in accordance with its designation. The purpose of this study is to predict water quality changes due to incoming waste from various sources of pollutants to the concentration of BOD in Kapuas Kecil River using WASP model as an effort to water quality monitoring and water pollution control.The study area to be simulated is Kapuas Kecil River passing through Pontianak City over ± 22 km from upstream to downstream (estuary) that divided into 42 segments. Water quality data were collected from several monitoring station locations in Kapuas Kecil River downstream, Landak River, effluent trenches located within the administrative area of Pontianak City, as well as secondary data on industrial effluents located along the study area. Water sampling method refers to the SNI 03-7026-2004, sampling was done once at each sample point with variations of the rainy and dry season, and at high and low tide conditions. Hydrometry data and river discharge can be obtained from primary and secondary data.The results showed that domestic and non-domestic of urban discharges that entering the river is very dominant influence on the water quality of the river. BOD concentration in rivers during the dry season is higher than rainy season both in high and low tide conditions. The simulation results of spatial distribution with all scenarios show that the accumulation of BOD pollution load begins after a distance of 5 km from the upstream boundary and then a significant increase in concentration occur at  segment 27 with loads originating from the Landak River and Pekong Trench. The BOD concentration then tends to fluctuate to a distance of 5 km before heading downstream, and after that it continues to decline towards the downstream.
ESTIMASI PRODUKSI JAGUNG (Zea Mays L.) DENGAN MENGGUNAKAN CITRA SENTINEL 2A DI SEBAGIAN WILAYAH KABUPATEN JENEPONTO PROVINSI SULAWESI SELATAN Laode Muhamad Irsan; Sigit Heru Murti; Prima Widayani
Jurnal Teknosains Vol 8, No 2 (2019): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.36885

Abstract

Production is a real benchmark in successful crop management which is the most important output economically. Currently, corn production estimates are generally done by conventional means through field surveys. This conventional way requires a high cost and a long time. Appropriate agricultural management requires precise and accurate information or data to increase production and economic benefits. Sentinel 2A remote sensing satellite data is potential to be used in assessment of corn production estimation. The purpose of this research is to make land use mapping and corn production estimation by using spectral approach. Estimated data were obtained from Sentinel 2A image by mapping land use and modeling of vegetation index (NDVI, SAVI, MSAVI, TSAVI, EVI, and ARVI) then compared with data of corn production in the field. The result of data analysis shows land use mapping using Sentinel 2A image has 91% confidence level. Calculation of production estimation can show the accuracy of 74% with RMSE 0.69. The highest correlation is estimated production with EVI index model with regression correlation equal to 74% which shows strong correlation on both variables. Estimated production of corn in 2017 in Jeneponto Regency is 178,660,69 tons.
KARBOKSIMETIL KITOSAN MENINGKATKAN DAYA SIMPAN FILET NILA MERAH YANG DISIMPAN PADA SUHU RENDAH Dr.Sc. Amir Husni
Jurnal Teknosains Vol 8, No 2 (2019): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.37406

Abstract

Kitosan diketahui memiliki aktivitas antibakteri, biodegradable, dan biokompatibel tetapi tidak larut dalam air. Modifikasi kitosan menjadi karboksimetil kitosan diharapkan mampu meningkatkan kelarutan dalam air tanpa mengubah bioaktivitas sehingga memungkinkan aplikasi sebagai antibakteri. Penelitian ini bertujuan mengkaji pengaruh pemberian karboksimetil kitosan sebagai bahan antibakteri terhadap daya simpan filet nila merah yang disimpan pada suhu dingin. Karboksimetil kitosan dibuat dengan cara mereaksikan senyawa kitosan dengan asam monokloroasetat pada suhu 900C selama 3 jam. Sampel filet nila merah segar direndam dalam larutan karboksimetil kitosan dengan konsentrasi 0%; 2%; 3% dan 4% selama 60 menit, kemudian disimpan pada suhu dingin 50C selama 12 hari. Parameter yang diamati tiap 4 hari yaitu Total Plate Count (TPC), Total Volatile Base (TVB), pH dan uji skoring. Hasil penelitian menunjukkan bahwapenggunaan konsentrasi karboksimetil kitosan yang berbeda memberikan pengaruh nyata (P
PERUBAHAN PERMUKIMAN NELAYAN PASCA REKLAMASI PANTAI DI KELURAHAN LETTE, KECAMATAN MARISO MAKASSAR Aidi Darmansyah; Sudaryono Sudaryono; Deva Fosterharoldas Swasto
Jurnal Teknosains Vol 8, No 2 (2019): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.37731

Abstract

Lette is one of the sub-districts in Mariso Subdistrict, Makassar City which has a suburban area and the community has a livelihood as a fisherman. The condition of the Tanjung Bunga coastal and coastal area has undergone a change, which used to be the territorial waters that are now largely transformed into land, this change is due to the ongoing coastal and coastal reclamation process in the area of Tanjung Bunga. To meet the need for urban space, Lette fishermen have no choice but to be relocated from their place of origin to the flats. This study aims to determine the spatial, cultural, socio-economic changes in the fishing settlement of Lette and the factors that drive these changes. This study uses an inductive-qualitative method with a phenomenological approach. The results of the study show that the changes that occur are changes in coastal space, changes in settlement space and the creation of a central business, tourism and entertainment area. Factors driving these changes are changes in fishing boat access and entry, dock circulation, catching areas that are not potential, domestic activities, spatial space utilization, bale-bale culture, informal fishing activities, and new economic space.
BUSINESS FEASIBILITY AND STRATEGY OF BUSINESS DEVELOPMENT OF CATFISH HATCHERY IN MINAPOLITAN AREA OF MAGELANG DISTRICT Riyadi Tri Cahyono; Any Suryantini; Jangkung Handoyo Mulyo
Jurnal Teknosains Vol 8, No 2 (2019): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.38737

Abstract

This study aims to (1) identify the feasibility of catfish hatchery business and (2) to know the alternative and strategic priorities that can be applied in the development of catfish hatchery business in the Minapolitan Area of Magelang District. Research location in sub-District of Muntilan, Mungkid, and Sawangan, was chosen by purposive sampling. Respondents were chosen by snowball 42 as samples from farmers and stakeholders related to catfish hatchery business.  Data analysis used on the business feasibility is BEP and R/C ratio criteria. The analysis of business development strategy uses SWOT analysis. The business feasibility analysis tool used is cost analysis, revenue, and nett revenue. Feasibility analysis result obtained BEP revenue of Rp53.587.484,00, BEP production of 255.087,71 unit fish, BEP price of Rp 56.00 per unit fish, and R/C ratio of 1,67. The development of strategy of catfish hatchery business are (1) maintaining good relationship with stakeholders and maximizing natural resources management for business development due to low interest of community on catfish hatchery business, and (2) utilizing expert resources (practitioners and academics) in the field of hatchery by government assistance to improve the quality of seed products and for expanding market size to meet the increased demand.
ELECTROSPUN BIOMATERIALS AND RELATED TECHNOLOGIES Adhi Anindyajati
Jurnal Teknosains Vol 8, No 2 (2019): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.46652

Abstract

Electrospun Biomaterials and Related Technologies is a multi-contributed book containing review articles from worldwide authors with industry and academic background. This book is aimed to deliver a compiled overview in biomaterials electrospinning, including strategies, relevant technologies, and state-of-the-art research. The editor, Jorge Almodovar, has chemical engineering background with extensive research experiences and focus on engineering of biomimetic materials. The book consists of nine chapters in 282 content pages. Arranged in a concise format, it delivers a comprehensive but not exhaustive reading text. The chapters cover broad range of topics in electrospinning field, including process reproducibility and robustness, fibrous collagen scaffold, cellulose-based biomaterials, biopolymer nanofibres, green electrospinning, electrospun materials for cancer research, nanofibrous nerve conduits, scaffold for retinal tissue engineering, and smart material. These topics are mainly related to biomedical applications, but studies on environmental engineering are also conferred.

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