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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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MANAJEMEN RISIKO TSUNAMI UNTUK PENATAAN RUANG DI PESISIR PERKOTAAN PACITAN JAWA TIMUR Ratih Probosiwi
Jurnal Teknosains Vol 2, No 2 (2013): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.6002

Abstract

The process of tsunami risk management through the use of disaster information is the important things to carry out by government of region with high potential tsunami hazard such as urban areas of Pacitan. Assessment of tsunami risk begins from hazard assessment, vulnerability and capacity assessment will provide appropriate information and also support decision making processes in order to reduce risk and loss that might arise when the disaster actually occurs. The policies of tsunami risk reduction could be done by spatial planning policy to regulate and control land usage in The Urban Pacitan. This article describes how the tsunami risk management for spatial planning done by the Pacitan Government.
KAJIAN PENGARUH KONSENTRASI Rhizopus sp. SEBAGAI AGEN PENGIKIS PROTEIN TERHADAP MUTU KULIT IKAN GURAMI TERSAMAK Ratri Nur Hayati
Jurnal Teknosains Vol 2, No 2 (2013): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.6003

Abstract

The study aimed to assess the effect of protease activity of Rhizopus sp. as a bating agent on the tanned carp leather quality, and their use for commercial leather products. The study was designed with a completely randomized design with four treatment, namely: the concentration of protease from Rhizopus sp. 0.5% (a1), 1.0% (a2), 1.5% (a3) and palkobat 1.0% (a4/control) with 3 replications. Parameters were observed that is (1) protease activity of Rhizopus sp and palcobat; (2) Thickness (mm), tensile strength (N/cm2), tear strength (N/cm), elongation (%), enervation (mm), shrinkage temperature (ºC), fat/oil content (%) of tanned leather; and (3) level of consumer acceptance (%) and added valuead of comercial leather product. The data of tanned leather quality is then compared with SNI 06-4586-1998 concenring freshwater snake skin leather and chrome Burk’s Bay (1996) on the raw material quality leather products. The test results of protease activity of Rhizopus sp. = 7.97 mg/50mg/ jam and palkobat = 13.62 mg/50 mg/hour. The results of the analysis of tanned leather carp qulity sample from each treatment and comparison with the SNI as follows: (1) Thickness: 0.41 (a1), 0.38 (a2), 0.43 (a3), 0.41mm (a4) and ≥ 0.22 (SNI 06-4586-1998). Tensile strength: 1682.67; 1818.17; 1195.57; 1670.55 and 1,000N/cm2 (SNI). Tear strength: 314.87; 310.95; 332.06; 462.22, and 150.00 N/cm (SNI). Elongation: 93.33; 62.67; 56.67; 97.33, and <30.00% (SNI). Enervation: 1.87; 2.20; 1.63, 2.49, and ≥ 2.0 mm (Burk’s Bay, 1996). Shrinkage temperature: 74.00; 95.33; 96.33; 97.33, and ≥ 70.33ºC (SNI). The fat/oil content: 7.84; 8.17; 5.25; 8.49, and 2.00 to 6.00% (SNI). All treatments were tested has met the SNI quality, except elongation and fat/oil content. The level of consumer acceptance of the Oval HP Cover that is (1) aspects of the display (76.67% like and 23.33% dislike), (2) the use of convenience (66.67% like and 33.33% dislike ), and (3) price (63.33% accepted and 23.67 reject). The level of consumer acceptance of the Box Cover HP models that is (1) aspects of the display (80.00% like and 20.00% dislike), (2) convenience of use (86.67% like and 13.33% dislike), and (3) price (66.67% accepted and 33.33% reject). The economic value of tanned carp leather as big as Rp 160.000/20 leather pieces and leather products as big as Rp 420,000 per 15 pieces of product.
Analisis Pengaruh Bentuk Telapak Kaki Terhadap Kelelahan Fisik Herianto Herianto
Jurnal Teknosains Vol 2, No 2 (2013): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.6004

Abstract

Physical activity over time can cause fatigue during exercise such as walking or light running. Physical fatigue effects on heart rate and blood pressure. Factors that can cause fatigue are gender, cardiovascular disease status, sport exercise habits, BMI (Body Mass Index) and study activities during a week. Physical fatigue also could be caused by factors shape of your foot, especially the form of flat feet/pesplanus in type 1, 2or 3. Subjects of this research were students of Industrial Engineering Gadjah Mada University ages 19 to 23 years with the aim of sampling techniques to the criteria of having normal or flat feet. The subjects run normally using a tread mill with a speed of 4 miles per hour for 6 minutes. The variables measured were heart rate and blood pressure. Heart rate was measured in three sessions among others before, during and after the experiment using a heart rate monitor while blood pressure was measured before and after the experiment. There are significant differences in systolic blood pressure before and after the experimental on indicator of sex, heart rate after experimental on indicator of disease status and heart rate on indicator exercise habit for normal feet. Then in the form of pesplanus foot type 1, there are significant differences like systolic and diastolic blood pressure after experimental on indicator of BMI (Body Mass Index) and systolic blood pressure on indicator of pre-experimental study activities during a week, in which a significant difference in respondents who did not have study activities of the respondents who went tocollegein6-10 hours. In the form of pesplanus foot type 2 there is a significant difference in heart rate when experimental on indicator of cardiovascular disease status.
The Routledge Handbook of Hazards and Disaster Risk Reduction Danang Sri Hadmoko
Jurnal Teknosains Vol 2, No 2 (2013): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.6006

Abstract

Buku ini menjelaskan secara detail tentang ancaman bencana yang ada, berupa ancaman bencana geofisik, ancaman bencana hidro-meterologis, ancaman bencana biologis/ekologis, dan ancaman bencana astronomis
PENETUAN ALE DAN AE LARVA LEPIDIOTA STIGMA F PADA TANAMAN TEBU Alimin, Edhi Martono, dan Witjaksono
Jurnal Teknosains Vol 3, No 2 (2014): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.6020

Abstract

This research was conducted to determine the value of Economic Injury Level (EIL) and Economic Threshold (ET) for the larvae of Lepidiota stigma instar 1, 2 and 3 in three different locations. The amount of larvae population and plant per m2 in the field, and the weight proportion of the vanished root or to-be-eaten by a larva were needed to determine the loss of result per m2 data on the maximum harvest outcome and the harvest outcome in the field per m2. The highest proportion value of the outcome loss per m2 based on the Walker Model, which has been modified on biological control with Nematode Entomo Patogen (NEP) Steinernema spp. combined with light trap, was in Tempel Sari, i.e. larvae instar 1 (0.0108), instar 2 (0.0174), and instar 3 (0.0221). The lowest value was in Grenjeng, i.e. larvae instar 1 (0.0048), instar 2 (0.0078), and instar 3 (0.0099). There were significant differences among the three instars, where the consumption greediness of instar 3 is higher than instar 1 and 2, so the proportion value of the outcome loss per m2 of larvae instar 3 in the respective locations was higher than that of the two other instars. Determination of EIL value based on the Bode & Calvin Models gave the highest EIL value in Grenjengwith larvae instar 1 in the amount of 15.50 with ET value 12.40, instar 2 in the amount of 9.59 with ET value 7.67, and instar 3 in the amount of 7.54 with ET value 6.03. On the other hand, the lowest EIL value was found in Tempel Sari, with larvae instar 1 in the amount of 6.97 with ET value 5.58, instar 2 in the amount of 4.31 with ET value 3.45, and instar 3 in the amount of 3.39 with ET value 2.71. 
PERKEMBANGAN LAYANAN TRANSPORTASI PERDESAAN PADA WILAYAH BERBUKIT Dewanti, Danang Parikesit, dan Achmad Djunaedi
Jurnal Teknosains Vol 3, No 2 (2014): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.6021

Abstract

Transport service development generally indicates some development problems and transport troubles in particular. This research analyses the development of rural transport services in Kemalang Sub-district, Klaten District, Central Java Province using qualitative research method and Case Study research approach. Primary data were collected by in-depth interviewing of 26 respondents, which was supported by secondary data from institutional survey. Transport service development was reviewed in three development stages; those are before 1990, 1990-2005 and 2005-2010. There have been alterations in the dominant transport service used during those three periods, from non-motorized private transport service to motorized public transport services, and then to private transport services of motorcycles. That development has led to positive changes in the character of transport services, such as the increase of transport service availability, flexibility and capability in solving nature’s restrictions, so that they promote mobility and accessibility. One negative change is the decrease of traffic safety. 
TEGANGAN RESIDU KEPING ARESTER SEBAGAI FUNGSI DARI CACAH KEPING ARESTER Devia Eka Yunida dan T. Haryono
Jurnal Teknosains Vol 3, No 2 (2014): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.6022

Abstract

Indonesia is a tropical area with a high intensity of repeating lightning strikes. The voltage is produced by lightning by increasing the presence of sensitive loads. Therefore, lightning can easily worsen the quality of consumer power, even if the generated voltage is relatively low. Lightning strikes can cause excessive voltage along the power lines. Its propagation can cause a voltage surge on low voltage systems, which can damage the equipment. Maintenance and protection against lightning strikes are necessary for the prevention of such damage. Arrester is a device that is intensively used nowadays by the general public to protect equipments from lightning strikes. It is used to protect the system from the danger of lightning by flowing current into the ground and leaving a certain resistance value, so that the system does not experience a surge voltage.This research was conducted through laboratory-scale testings using several major equipments, such as a high voltage generator, an impulse voltage generator, and an oscilloscope. Modifications of the tests were done using one to four 220 volt low voltage Merlin Gerin LTD arresters arranged in series, with a maximum current of 6.5 kA . Calculations using equations for low voltage circuit in series were done for more than four arresters. From the test results, it was found that the characteristics of the arrester residual voltage will rise when connected in series. Low voltage arresters can be used for higher voltage requirements by counting the number of arresters needed. The equation for the number of arresters in series required to cut the overvoltage surge is y = 0.694x – 0.106. Therefore, if more than 4 arresters will be needed, the residue voltage can be estimated through this formula. 
CONTACT ANGLE MEASUREMENT OF DENTAL RESTORATIVE MATERIALS BY DROP PROFILE IMAGE ANALYSIS H. D. K. Yulianto dan M. Rinastiti
Jurnal Teknosains Vol 3, No 2 (2014): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.6023

Abstract

The capability of initial microbial adhesion to dental restorative composites surface is influenced by the surface wettability of the materials. The common method to evaluate surface wettability of materials is contact angle measurement. The existing conventional method to measure contact angle is by means of a contact angle (CA)-Goniometer device, which is less practically applicable in clinical circumstances. Therefore, a more practical and applicable method is needed to measure contact angle in clinical circumstances. This research was performed to compare between contact angles measured by means of a CA-Goniometer device and a new practical method of drop profile image analysis. In addition, since there were two different formulas that can be used to calculate contact angle value from a drop profile image, then we also need to evaluate which formula is more reliable to be used. Tests were carried out using three composite discs (Clearfill-Kuraray Medical, Inc.) sample and deionised water for different measurement procedures. One drop of 3µl liquid was dropped onto the surface of the composite discs, and the drop profile image was captured by means of a customized home-made device connected to a digital camera. Two different formulas were used to calculate the contact angle value from the drop profile image, namely the “linier gradient equation” and the “tangential line”. The contact angle values obtained from the two different formulas were compared with the value obtained from the conventional method descriptively. Tests were carried out using three composite discs (Clearfill-Kuraray Medical, Inc.) sample and deionised water for different measurement procedures. One drop of 3µl liquid was dropped onto the surface of the composite discs, and the drop profile image was captured by means of a customized home-made device connected to a digital camera. Two different formulas were used to calculate the contact angle value from the drop profile image, namely the “linier gradient equation” and the “tangential line”. The contact angle values obtained from the two different formulas were compared with the value obtained from the conventional method descriptively. The differences in percentage between the contact angle value calculated by the “linier gradient equation” and “tangential line” formulas, and those calculated by means of the CA-Goniometer are 20,56% and 3,51%, respectively. It is obviously demonstrated that the value obtained by the “tangential line” formula has a smaller difference compared to those obtained by the “linier equation gradient” formula. Among the two different formulas, it is confirmed that the contact angle value calculated with the “tangential line” formula has closer similarity with the value obtained from the CA-Goniometer. This result confirms that the new practical method of drop profile image analysis is promising for measuring contact angle values in clinical circumstances. Related to the drop profile image analysis, the “tangential line” formula is more accurate compared to the “linier gradient equation” formula.
LANSKAP EKOLOGI KESERASIAN DAN KEMENARIKAN KEPARIWISATAAN ALAM DI WILAYAH YOGYAKARA UTARA Muhamad muhamad
Jurnal Teknosains Vol 3, No 2 (2014): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.6024

Abstract

This study examines the extent of landscape ecology and attractiveness of the natural environment in the tourism area in the region north of Yogyakarta. Yogyakarta northern region has objects and natural tourism attractions of the venture capital in its tourism development footprint. The compatibility and attractiveness level of the environment is one of the most important factors to determine the region’s level of potential environmental compatibility and attractiveness, so that the characteristics and the distribution pattern of the attractiveness and harmony of nature in the tourism region can be known. The results showed that the landscape level of ecological harmony and the attractiveness of the environment after the 2010 eruption had a significant amount of the index. The higher the quality of the natural (physical) environment and social (human and socioeconomic) culture is, the higher the level of harmony and attractiveness of the region. Landscape ecology establishes harmony between the social component (population) and the natural environment (bio-physical), suchthat they form a potential tourist attraction at the site of nature tourism in the region north of Yogyakarta. 
ADSORPSI PENCEMARAN LIMBAH CAIR INDUSTRI PENYAMAKAN KULIT OLEH KITOSAN YANG MELAPISI ARANG AKTIF TEMPURUNG KELAPA Musrowati Lasindrang
Jurnal Teknosains Vol 3, No 2 (2014): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.6026

Abstract

Chitosan has been used as biosorbent. In addition to having advantages, chitosan as biosorbent also has disadvantages. Chitosan is very soluble in low pH, so it cannot adsorb Cr (total) at low pH. It is because the active site (amine group) of chitosan undergoes protonation, and its adsorption capability is easily influenced by anions in waters. Therefore, this research studied the use of chitosan coating on active charcoal of coconut shell to increase the adsorption capability of Cr (total), BOD, and COD. This research was done to evaluate the characteristics of the liquid waste quality with or without Wastewater treatment unit (IPAL), and compare them with the Regulation of DIY Governor number 7/2010. It also studied the effect of pH and Concentration of chitosan coating on active charcoal as adsorbent on the decrease of Cr (total), BOD, and COD concentration in the liquid waste of leather tanning. The results indicate that the liquid waste of the leather tanning industry with and without Wastewater treatment unit (IPAL) have exceeded the quality standard for the liquid waste of leather tanning industry. An ANOVA statistical test indicated that Cr (total), BOD, and COD are significant at 0.05 (p < 0.05), with various pH influencing the decrease in Cr (total), BOD, and COD. The highest removal percentage resulting from the effect of chitosan concentration coating on active charcoal is obtained in adsorbent C (K3A1), with Cr (total) (91.9%); BOD (99.5%); and COD (98.47%).;

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