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Jurnal Teknosains
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Core Subject : Engineering,
JOURNAL TEKNOSAINS, is a journal which began publication in 2011, and is published each June and December. JOURNAL TEKNOSAINS is a series of scientific publications in science and technology area from the perspective of a multi and interdisciplinary studies. JOURNAL TEKNOSAINS is an interdisciplinary forum for the publication of original peer-reviewed, contributed and invited articles to improve and enhance science and technology. The journal provides a stimulating and informative variety of papers geared toward theory and practice in the hope that common information shared among a broad coalition of individuals and groups involved in science and technology will facilitate future efforts. JOURNAL TEKNOSAINS published by the Graduate School of Gadjah Mada University. All articles will be subjected to double-blind peer review process following a review by the editors.
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Articles 8 Documents
Search results for , issue " Vol 2, No 2 (2013): June" : 8 Documents clear
PENGARUH KATALIS BASA (NaOH) PADA TAHAP REAKSI TRANSESTERIFIKASI TERHADAP KUALITAS BIOFUEL DARI MINYAK TEPUNG IKAN SARDIN Ningtyas, Diah Probo
Jurnal Teknosains Vol 2, No 2 (2013): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (837.559 KB) | DOI: 10.22146/teknosains.6000

Abstract

Biofuel is an alternative diesel engine fuel is produced from oils/fats of plants and animals (including the fisheries industry waste) through the esterification and transesterifiksi reactions. A transesterification is reaction to form esters and glycerol from trigliserin (fat/oil) and bioalcohol (methanol or ethanol). Transesterification is an equilibrium reaction so that the presence of a catalyst can accelerate the achievement of a state of equilibrium. Process of the transesterification reaction of sardine flour oil waste with NaOH as base catalyst in producing biofuels was conducted.The research purpose has studied the influence of NaOH concentration in transesterification process and examinate its effect on the quality of biofuels production, conversion, and physic quality. The variables that analysed was the effect of NaOH concentration as catalyst (0.5%, 1.0%, 1.5%, and 2.0% from amount of oil and methanol) in the transesterification reaction step. The result showed that the increasing NaOH concentration (0.5 - 1.5%), enhanced the biofuel conversion (%). The highest conversion of biofuels was achieved by using 1.50% NaOH (w/w) with 45.34% biofuels conversion. The major component in the biofuels was methyl palmitate (20.31%). ASTM analysis data also supported that the biofuel product was in agreement with automotive diesel fuel specification.
PENGEMBANGAN MATERIAL PASAK ENDODONTIK Ti/40HA DENGAN MENGGUNAKAN KONSEP FUNCTIONALLY GRADIENT MATERIAL Herliansyah, M. K.
Jurnal Teknosains Vol 2, No 2 (2013): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (866.682 KB) | DOI: 10.22146/teknosains.6001

Abstract

Commercial endodontic pegs have a homogeneous composition and strength so that the transmission voltage of pegs to dentin often result in damage to the tooth root. The concept of functionally gradient material (FGM) is expected to overcome these problems by adjusting the mechanical properties of each peg to the nature of the teeth. This study aims to develop a material stake with the concept of FGM from Ti/40HA material that is composed of five layers with concentrations of HA from 0% - 40% wt through the process of uni-axial pressing followed by sintering at 1200oC and 1400oC in argon gas. Then performed on each layer characterization by SEM / EDX, the optimum sintering temperature was determined by test-t (p <0,05). Morphological Testing showed that the composite of Ti/40HA still porous, while EDX shows the composition of Ca and P increase as an indication of increment in the concentration of HA as the decrement in concentration of the layer-1 (100% Ti) up to layer-5 (60% Ti-40% HA). In conclusion, Ti/40HA200 and Ti/40HA200 composite materials can be produced by decreasing its roughness as the rising concentrations of HA in each section.
The Routledge Handbook of Hazards and Disaster Risk Reduction Hadmoko, Danang Sri
Jurnal Teknosains Vol 2, No 2 (2013): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (585.189 KB) | 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
MANAJEMEN RISIKO TSUNAMI UNTUK PENATAAN RUANG DI PESISIR PERKOTAAN PACITAN JAWA TIMUR Probosiwi, Ratih
Jurnal Teknosains Vol 2, No 2 (2013): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (838.761 KB) | 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.
HUBUNGAN ANTARA INDEKS VEGETASI NDVI (NORMALIZED DIFFERENCE VEGETATION INDEX) DAN KOEFISIEN RESESI BASEFLOW PADA BEBERAPA SUBDAS PROPINSI JAWA TENGAH DAN DAERAH ISTIMEWA YOGYAKARTA Latuamury, Bokiraiya
Jurnal Teknosains Vol 2, No 2 (2013): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2029.434 KB) | DOI: 10.22146/teknosains.5998

Abstract

The background of this research is the decrease of environment capacity in cacthment ecosystem, especially impact of vegetation forest on behavior streamflow. The indicators of cacthment destruction can be seen through hydrograph characteristics. Evaluation of cactment respons of flow hydrographic as an evaluation tools of river catchment responses becomes very important to analyze because it is a benchmark in determination several policy about flood, drough, sedimentation and landslide handling. The research purpose is to analyze the relationship between vegetation index NDVI (Normalized Difference Vegetation Index) and the characteristic of baseflow recession coefficient at several subcatchment areas in province of Central Java and Specific District of Yogjakarta.The method of this research is surveillance on data recording of AWLR (Automatic Water Level Recorder) and data of River Flow Measuring Stations in order to separate the baseflow by calibration curve, and image interpretation of Landsat ETM+ for the transformation of vegetation index (NDVI-Normalized Difference Vegetation Index).The analysis on recession coefficient data (Krb) and NDVI were correlated to analyze the strength of relationship between these two parameters. The results of statistical analysis on index NDVI and recession coefficient showsthat NDVI and recession coefficient value at R2 is 0.1427, F = 2.17 which is not significant at 1% significance level of 0.1646. The result shows a very weak correlation of 0.077 which mean that vegetation density (NDVI index)has a very weak control on low flows. Basically, river baseflow is a genetic component of river flow which comes from aquifer storage and/or other low flow sources. Thus, geology and soil have a significant effect on baseflow.
KAJIAN PENGARUH KONSENTRASI Rhizopus sp. SEBAGAI AGEN PENGIKIS PROTEIN TERHADAP MUTU KULIT IKAN GURAMI TERSAMAK Hayati, Ratri Nur
Jurnal Teknosains Vol 2, No 2 (2013): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (824.161 KB) | 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.
APLIKASI KOAGULAN ALAMI DARI TEPUNG JAGUNG DALAM PENGOLAHAN AIR BERSIH Prihatinningtyas, Eka
Jurnal Teknosains Vol 2, No 2 (2013): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (839.489 KB) | DOI: 10.22146/teknosains.5999

Abstract

Maize can be used as natural coagulant in water treatment process.The aim of this research was find the optimum condition on water treatment using natural coagulant from maize. Maize extract made by dissolving 5 grams of maize into 100 ml NaCl. The solution separated by centrifugation. The supernatant named extract of maize. Extract of maize loaded onto column packed with Amberlite and produced ionic maize.The active components are carboxyl, hydroxyl and amides groups. Ionic maize yield better turbidity removal than extract of maize. Coagulation withh high initial turbidity gave high efficiency of turbidity removal than low turbidity. Coagulation process runs efficiently at pH 5 because at that point the isoelectric point was obtained. The flowrate less than 0.03 m/ min, the alum will provide the efficiency of suspended solids removal greater than extract of maize. While the over flowrate higher than 0.03 m / min, settling velocity of kaolin using alum and extract of maize are the same.
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 | Full PDF (882.052 KB) | 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.

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