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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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INDONESIA
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 224 Documents
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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.
Faktor Penentu Produksi pada Perkebunan Rakyat Kelapa Sawit di Kabupaten Mamuju Utara Dimas deworo puruhito; Jamhari Jamhari; Slamet Hartono; Irham Irham
Jurnal Teknosains Vol 9, No 1 (2019): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.38914

Abstract

There are three patterns of smallholder oil palm plantation in North Mamuju regency, ie plasma, IGA (Income Generating Activity), and mandiri (independent). Independent smallholder plantations are plantations managed by the community themselves without the involvement of others. While the partnership patterns can be divided into plasma and IGA. The partnership is a form of fostering of smallholders plantations by large private plantation in this area. This study aims to determine the amount of oil palm production on smallholder plantations and the factors that affect.This research was conducted in North Mamuju Regency, West Sulawesi Province which has the widest smallholder oil palm plantation in Sulawesi Island with various pattern. Four villages in two sub-districts were chosen purposively consideration with having three patterns of smallholder plantations. Farmer samples were taken using the snowball method after stratification of the pattern was carried out. Data analysis was performed with Cobb-Doulas function model in the normalized logarithm, using Eviews 6 software. These findings are the average production of 56,840 kg, with productivity of 20,300 kg/ha. Input of land area, NPK fertilizer, age of oil palm crops, outside family labor, frequency of estate sanitation and distance of estate to river is the determinant input to production. Input land area is found as the most elastic input. However, land use for oil palm plantations should still refer to existing legislation
Kinerja Usahatani Kelapa Sawit Lahan Gambut di Desa Dayun Kabupaten Siak Muhammad Naufal; Lestari Rahayu Waluyati; Dwidjono Hadi Darwanto
Jurnal Teknosains Vol 9, No 1 (2019): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.38976

Abstract

Penelitian ini bertujuan untuk: 1) Menentukan faktor-faktor yang mempengaruhi produksi usahatani kelapa sawit. 2) Menentukan seberapa besar kontribusi pendapatan kelapa sawit terhadap total pendapatan rumah tangga petani sawit. 3) Menentukan tingkat kemiskinan petani lahan gambut (petani kecil). Sampel petani dalam penelitian ini diambil secara purposive sebanyak 55 responden di Desa Dayun Kabupaten Siak. Pengambilan sampel dilakukan secara purposif salah satunya dengan pertimbangan bahwa petani yang diwawancarai adalah petani yang memiliki lahan "Tanaman Produktif" dari kelapa sawit di lahan gambut. Analisis regresi berganda dengan pendekatan Ordinary Least Square (OLS) digunakan untuk menganalisis faktor-faktor yang mempengaruhi produksi lahan gambut dan untuk mengetahui kontribusi pendapatan kelapa sawit terhadap total proporsi proporsi pendapatan rumah tangga yang digunakan. Dalam menentukan tingkat kemiskinan, analisis dilakukan dengan menggunakan pendekatan berdasarkan pengeluaran konsumsi rumah tangga dan total pendapatan rumah tangga. Kebutuhan konsumsi minimum telah ditetapkan oleh BPS sebagai garis kemiskinan (GK) digunakan sebagai perbandingan dari dua pendekatan. Hasil penelitian menunjukkan bahwa variabel yang mempengaruhi produksi lahan gambut adalah luas lahan, penggunaan tenaga kerja, penggunaan pupuk dolomit, penggunaan pupuk KCL, penggunaan pupuk urea, dan tingkat pendidikan petani. Setengah dari total responden memiliki pendapatan dari pertanian kelapa sawit yang menyumbang lebih dari 50% terhadap total pendapatan rumah tangga mereka. Untuk tingkat kemiskinan petani di Desa Dayun telah ditemukan bahwa lebih dari 50% petani lahan gambut (petani kecil) di Desa Dayun berada dalam kategori tidak miskin.
Penerapan Metode Life-CycleCost dalam Perhitungan Evaluasi Ekonomi Jembatan untuk Penetuan Prioritas Penanganan Jembatan Risang Aji Dananjoyo; Akhmad Aminullah; Arief Setiawan Budi Nugroho
Jurnal Teknosains Vol 9, No 2 (2020): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.39052

Abstract

Bridge oftentimes become a critical components of roads because it used to determine the maximum load capacity of a passing vehicle on the roads. The bridges require maintenance activity in the shape of general maintenance or periodically replacement while this is estimated in order that the bridge may continue to function properly. The economic evaluation of the Interurban Bridge Management System (IBMS) aims to determine the priority of bridge handling. One of the calculations required in NPV and IRR calculations used in priority handling is the cost of replacing the bridge. Over time, the Interurban Bridge Management System (IBMS) system must be constantly updated to continue to use in accordance with current circumstances and use new, better methods. This study uses Life-Cycle Cost (LCC) method as an alternative method to calculate the replacement cost of 5 bridges in Daerah Istimewa Yogyakarta in 2012. The IBMS method produces a priority sequence of bridge handling with Bogo bridge, Suru bridge, Winongo bridge, Kalasan B bridge and Duren bridge in sequence. The Life-Cycke Cost (LCC) method produces a priority sequence of bridge handling with Bogo bridge, Winongo bridge, Suru bridge, Kalasan B bridge and Duren bridge. The average initial cost of bridge replacement using both methods is 23.012%. The value earned using the Life-Cycle Cost method is always greater due to the addition of inspection fees, maintenance costs, and damage costs of the bridge.
Pengaruh campuran bahan bakar pertalite-bioetanol biji sorghum pada mesin bensin Abdi Hanra Sebayang; Husin Ibrahim; Surya Dharma; Arridina Susan Silitonga; Berta Br Ginting; Natalina Damanik
Jurnal Teknosains Vol 9, No 2 (2020): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.40502

Abstract

The depletion of fossil fuels, rising of earth temperatures and declining of air quality are an unavoidable phenomenon today. This condition is a result of increased and excessive use of fossil fuels. Bioethanol fuel is one solution to reduce this problem that is sourced from renewable raw materials. Sorghum seeds are raw materials that have the potential to be made bioethanol due to they have a high carbohydrate content (70%). The test is performed the use of pertalite-bioethanol blends fuels was on a four-stroke gasoline engine without modification. The percentage of the mixture volume of fuel used is 10% bioethanol-90% pertalite (E10), 15% bioethanol-85% pertalite (E15) and 20% bioethanol-80% pertalite (E20). Engine speeds vary from 1000 to 4000 rpm, and properties of the sorghum seeds bioethanol-pertalite blends are measured and analyzed. The purpose of this study is to investigate engine performance and exhaust emissions at gasoline engine by using the sorghum seeds bioethanol-pertalite blends with different mixed ratios (E10, E15 and E20). The Engine performance includes engine torque, brake specific fuel consumption (BSFC) and thermal brake efficiency (BTE) analyzed. In addition, carbon monoxide (CO), hydrocarbon (HC), and nitrogen oxide (NOx) emissions are measured as gasoline engine exhaust emissions. The results show that BSFC decreased while BTE increased for a fuel blends containing 20% bioethanol at 3500 rpm engine speed, with each maximum value of 246.93 g/kWh and 36.28%. It is also found that CO and HC emissions are lower for the sorghum seeds bioethanol-pertalite blends. Based on the research results, it can be concluded that the sorghum seeds bioethanol-pertalite blends can improve engine performance and reduce exhaust gas emissions.
Problematika Pengembangan Padi Organik di Sawangan Magelang serta Peluang Sertifikasi Internasional Subejo PhD; Irham Irham; Pinjung Nawang Sari; Arif Wahyu Widada; Azizatun Nurhayati; Laksmi Yustika Devi; Esti Anatasari
Jurnal Teknosains Vol 9, No 1 (2019): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.40604

Abstract

Organic farming has been remarkably evolving in many areas of Indonesia for responding environmental issues and producing healthy foods. Organic rice is a type of organic farming product of a system which has been widely practiced including in Sawangan Village Magelang District as one of pioneering area on organic rice development in Central Java Province. This study is directed to analyze supporting factors, various problems faced on the development of organic rice and opportunity for getting international organic certification. A study has been done through household interview (30 farmers), indepth interview with key informants and Focus Group Discussion (FGD) at agricultural office of Magelang District. Data analysis used in this study are statistical descriptive and categorical qualitative. Results of the study show that: (1) performance of organic rice gradually getting better and productivity level has been getiing closer to conventional high external input rice farming, (2) supporting factorson improvement of organic rice include healthy rice production initiated through integrated pest management,transformative group leadership, supports from related stakeholders, high economic incentive, improvement of market networking, product certification, ICT application and favourable natural resource endowment, (3) Problems faced on the development of organic rice include variety of product quality among farmers, price variety and fluctuation, difficulty in organic seed access, mixing area of organic and anorganic rice farming, (4) Strategies for improving opportunity to get international organic sertification include innovation on product diversification, application of fresh product certification, modernization of machine for rice processing.
Stochastic frontier analysis on technical efficiency of strawberry farming in purbalingga regency Indonesia Irene Kartika Eka Wijayanti,; Jamhari Jamhari,; Dwidjono, Hadi Darwanto; Any Suryantini
Jurnal Teknosains Vol 9, No 2 (2020): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.40944

Abstract

The objective of this study is to determine technical efficiency and factors affecting technical inefficiency of strawberry farming in Purbalingga Regency. This study was conducted in Karangreja Subdistrict, Purbalingga Regency, Central Java Province. Purposive sampling method was utilized to select 100 farmers as the respondents. All of whom have been running their farm business for at least three years consecutively from 2015 to 2017. Stochastic frontier production function was applied to measure technical efficiency and factors affecting technical inefficiency. The findings show that strawberry farming in Purbalingga Regency, Central Java Province, is technically efficient with efficiency number varies between 26.50-99.40% and the average efficiency number of 77.80%. Furthermore, the results indicate that the farmers’ formal education and the number of household members significantly affect the technical efficiency of strawberry farming.
Design of ergonomic chair for grinding operation Andrean Emaputra; Taufik Hidayat; Gunawan Budi Susilo
Jurnal Teknosains Vol 10, No 1 (2020): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.41053

Abstract

One of essential production activities is grinding process. This process mainly involves the constant activity of eroding a surface to be smoother or more evenly, cutting a workpiece, creating profiles like angles and arches, sharpening a cutting tool, and finishing a final product. Meanwhile, there is no study evaluating the risk levels of workers working on grinding, and there is no unique chair specifically designed for the process. Therefore, this study aims to assess the risk levels of a grinding worker and to propose the design of an ergonomic chair that is adjustable, comfortable, durable, and keen to be used. The risk levels of the grinding workers were evaluated using REBA, while the ergonomic chair design was based on anthropometric data taken from 4 grinding workers in Bantul, Special Region of Yogyakarta, Indonesia. The researchers selected a buttock-popliteal length (seat depth), lower leg length (popliteal height) and hip breadth sitting as anthropometric measures to make a chair design for the grinding operations. After that, the existing adjustable chair designs were also considered and evaluated to get better adjustableergonomic chair design for the grinding operations. The results show that it is important that the stakeholders improve most of the grinding operations of the workers, especially by using an ergonomic chair design for grinding operation that is adjustable, comfortable, durable, and reliable. The chair height can be adjusted from 361-414 mm to adapt with the users, and the variation in product height aims to prevent bending on the back. Finally, the grinding chair can reduce the risk level from the high and medium level to the low-risk levels of working postures.
Composite resin restoration with fiber reinforced composite after root canal treatment of necrotic pulp tooth with gumboil Dessy Natalia; Yulita Kristanti
Jurnal Teknosains Vol 10, No 2 (2021): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.41113

Abstract

Gumboil is inflammation reaction in the gum caused by pulp infection. Gumboil is seen as an oral lesion characterized by a soft erythematous papule where a periapical abcess is draining into the oral cavity. An adequate root canal treatment can  cure gumboil and remove bacteria from the root canal. To support the success of root canal treatment, final restoration used in this case is composite resin restoration with reinforcing fiber (short fiber reinforced composite). The purpose of this treatment was to restore the functions of tooth in mastication and preserving the supporting tissue. A female patient age 23 years old came with complaints of pain in the lower right mandibular molar accompanied by swelling of the gums around the teeth since a week ago. Swelling is intermittent since last 3 months. The tooth have been restored for about 3 years ago. Clinical examination showed a positive percussion, positive palpation, negative vitality, and negative mobility. Radiographic examination showed bifurcation and periapical lesions. Root canal treatment is performed with crown down preparation technique and followed by direct composite resin restoration with short fiber reiforced composite. The success of root canal treatment followed by composite resin restoration with short fiber reinforced fiber is marked by the absence of complaints as well as the dissappearance of gumboil.
Mapping of pga value using psa method in West Halmahera North Maluku Rohima Wahyu Ningrum; Wiwit Suryanto; Hendra Fauzi; Estuning Tyas Wulan Mei
Jurnal Teknosains Vol 9, No 2 (2020): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.41483

Abstract

The earthquake that occurred in the West Halmahera region was very detrimental, even though the human casualties were not very significant. But it will affect the stability and capacity of a region in terms of regional development. The mapping of earthquake-prone areas is carried out by a probabilistic seismic hazard analysis (PSHA) method to analyze soil movement parameters, namely Peak Ground Acceleration so that it can determine earthquake-prone areas in West Halmahera. The results of seismic hazard analysis show that the West Halmahera area is an area that is relatively prone to earthquake hazards because it is still strongly influenced by subduction (megathrust) earthquakes from the Philippine plate, Maluku sea and Sangihe. This is indicated by the value of earthquake acceleration on the Peak Ground Acceleration for the 500 year return period of around 0.38 - 3.69 g and 0.30 - 3.69 g for the 2500 year return period.

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