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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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Rasio natrium karbonat dalam ekstraksi berpengaruh pada mutu natrium alginat sargassum muticum Sovia Indah Nurkhanifah; Amir Husni
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.41982

Abstract

Brown seaweed is one of Indonesia’s biological resources which has good potential as source for alginate which can be used for the food and non-food industries. Alginate was most widely used in the textile sector around 50%, food industry 30%, paper industry 6%, welding rods 5%, pharmacy 5% and other 4%. The process of taking alginate from brown seaweed can be done by extraction. Several studies have been carried out in an effort to improve the yield of alginate extraction. The objective of this study was to determine the effect of the ratio of Na2CO3 and obtain the best ratio of Na2CO3 for producing sodium alginate from Sargassum muticum. The ratio of Na2CO3 used was 1:10, 1:20, 1:30, 1:40, 1:50 (w/v) and observations of alginate quality included yield (%), viscosity (cps), pH, water content (%), whiteness degree (%), ash content (%) and functional groups. The results showed that the higher the ratio of Na2CO3 produced the lower viscosity and showed significantly different values but yield, pH, water content, whiteness degree, and ash content were not significantly different. The functional groups at the ratio 1:20, 1:30, and 1:40 (w/v) showed the alginate that were in accordance with the standard. The best ratio of Na2CO3 from this study was 1:20 (w/v) because it had a medium viscosity, besides that, the yield, pH, water content, whiteness degree, and ash content also accordance to the quality of alginate standard.
Analisis pengendalian mutu bahan baku utama susu kambing bubuk di bumi haijau Yogyakarta Yohana Agustina
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.42139

Abstract

Pengendalian mutu suatu produk memegang peranan penting dalam memberikan kepuasan dan mempertahankan loyalitas pelanggan. Tujuan penelitian ini adalah untuk mengetahui proses pengendalian mutu bahan baku, dan mengidentifikasi faktor-faktor penyebab dominan dalam kegagalan mutu bahan baku susu kambing bubuk di Bumiku Hijau Yogyakarta. Penelitian menggunakan metode deskriptif. Data yang digunakan adalah jumlah kegagalan bahan baku selama Januari sampai dengan Mei 2018. Teknik analisis data menggunakan statistical quality control, yaitu peta kendali p (p-chart) dan diagram sebab-akibat untuk mengidentifikasi penyebab kegagalan produk. Hasil dari analisis peta kendali p (p-chart) diperoleh nilai LCL (0,00), CL (0,00), dan UCL (0,02), menunjukkan bahwa terdapat 6 titik yang melewati batas atas kendali statistik selama Januari sampai dengan Maret 2018. Total kegagalan bahan baku (reject) selama Januari sampai dengan Maret 2018 adalah 18 liter susu kambing murni. Jenis penyebab kegagalan bahan baku yang paling banyak adalah karena warna susu kambing keruh dan aromanya tidak segar. Hasil identifikasi faktor penyebab kegagalan bahan baku dominan dengan menggunakan diagram sebab akibat menunjukkan bahwa faktor-faktor penyebab kegagalan bahan baku antara lain adalah peternak (man), peralatan produksi (machine), dan lingkungan (environment). 
DENTAL MATERIALS FOUNDATIONS AND APPLICATIONS Dyah Anindya Widyasrini
Jurnal Teknosains Vol 8, No 1 (2018): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.42375

Abstract

Rongga mulut merupakan lingkungan yang amat beragam kondisinya. Material yang akan digunakan dalam lingkungan tersebut harus mampu bertahan dalam segala kondisi. Dalam lingkungan rongga mulut hal-hal ini sangat biasa terjadi: perubahan temperatur yang drastis, tekanan mekanis yang besar, melekatnya komunitas mikroorganisme pada semua permukaan maupun adanya serangan bahan kimiawi dari makanan maupun cairan tubuh. Memahami dasardasar ilmu material merupakan kunci untuk dapat mengembangkan material yang cocok dengan lingkungan mulut serta relevan dengan kenyataan klinis yang dihadapi. Dengan mengerti dasar ilmu material diharapkan pembaca dapat memprediksi keberhasilan perawatan dengan material kedokteran gigi. Buku yang ditulis oleh John M. Powers dan John C. Wataha ini menjelaskan material dental dari hal yang paling dasar, yaitu atom penyusunnya, hingga aplikasinya dalam praktik klinis. Consice but precise, begitulah cara materi dalam buku ini disampaikan. Diulas dalam 15 bab plus 1 bab pendahuluan dengan alur yang runtut pada tiap bahasannya. Dimulai dari sifat-sifat material, kegunaan, manipulasi spesifik, serta aplikasi klinis dalam dunia kedokteran gigi, sehingga memudahkan pembaca dalam memahami dan membandingkan tiap material. Setiap akhir dari bab dalam buku ini juga dilengkapi dengan self-test questions, untuk mengukur seberapa dalam pemahaman pembaca terhadap materi yang telah disajikan. Tentunya berbagai material dan teknologi terbaru yang digunakan di kedokteran gigi juga tidak lupa diuraikan.
Karakteristik temperatur fluida dingin pada grooved double pipe heat exchanger Putu Wijaya Sunu; I Putu Darmawa; Anak Agung Ngurah Bagus Mulawarman; I Made Suarta; I Putu Gede Sopan Rahtika
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.43291

Abstract

Heat exchangers have widespread applications in many industrials process. There are many kind of heat exchanger. One of the simply heat exchanger is double pipe heat exchanger. The need for lightweight and enhancing the heat transfer of heat exchanger accomodated by surface engineering. One of the surface passive technique applications is groove. Incising groove in pipe as concerned wide consideration as it need no additional power, decrease in weight of system and hence give more benefit in heat transfer. The characteristics of heat transfer in grooved double pipe heat exchanger was investigated experimentally in this article. The aim of this investigation is to reveal the phenomenon of temperature characteristics of cold fluid in the heat transfer process in the grooved double pipe heat exchanger. In this study, water are used as both hot and cold fluid with counter flow pattern, and the water flow rate equal to 15 lpm for both fluid. Grooves were incised on the annulus area in the outer wall of tube side with rectangular shape and circumferential pattern. The characteristics of groove dimension that are height of groove is 0,3 mm; distance between grooves is 8 mm; and the groove space which is as independent variables are 1 mm and 2 mm. The data from 1 mm and 2 mm grooves space were compared with no grooved double pipe heat exchanger data (smooth pipe). The hot fluid temperature is 50 ± 0,50C while the cold fluid temperature is 30 ± 0,50C. The temperature data on the inlet and outlet side of heat exchangers for smooth pipe, 1 mm and 2 mm groove space were compared to find out the characteristics of increasing cold fluid temperature. This study used the temperature rate and temperature acceleration method to compare the variables. The result shows that groove installation increases the amount of heat absorbed by cold fluid. The heat exchanger with 1 mm groove spaces, was able to absorb heat about ± 2.3 % better than heat exchanger with 2 mm groove space and 13,1 % better than heat exchanger with no groove.
Analisis sitogenetik sel epitel mukosa bukal pekerja stasiun pengisi bahan bakar umum di kota Yogyakarta Regina TC. Tandelilin; Elastria Widita; Rini Maya Puspita; Tang Sze Mun
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.43852

Abstract

Workers employed in petroleum station have a high-risk exposure to a wide range of toxic compounds with known mutagenic and carcinogenic potential. Cytogenetic damage might have happened if they continuously exposed to petroleum derivatives. This study aimed to analyse the cytogenetic damage in exfoliated buccal cells among petroleum station workers in Yogyakarta City. This cross-sectional study was carried out on 30 petrol station workers who are working at a different petrol station in Yogyakarta and the control group consisted of 30 healthy subjects. Examination for all subjects included frequencies of nuclear abnormalities, including pycnosis, karyorrhexis, and karyolysis. Cytological preparations were stained according to papanicolaou reaction and analyzed under light microscope for making a score for degenerative nuclear alterations (pycnosis, karyolysis and karyorrhexis). Analysis of buccal cells revealed that frequencies of pycnosis and karyorrhexis in petrol station workers were significantly higher than the control group (P<0.05). Conversely, there was no significant difference in karyolisis among groups. These findings indicate that the petrol station workers are under the risk of significant cytogenetic damage, particularly pycnosis and karyorrhexis. 
Berkumur rebusan daun sirih merah (paper crocatum) konsentrasi 10% meningkatkan ph saliva pada lansia penderita diabetes melitus tpe 2 Regina TC. Tandelilin; Leny Pratiwi Arie Sandy; Meydistin Juwita Hondro
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.43897

Abstract

Dental caries is the major dental and oral health problems in Indonesia and world wide. Alteration in the saliva acidity level (pH) in the oral environment plays an important role in dental caries. Red betel leaf (piper crocatum) is a herbal plant that commonly found in Indonesia. Red betel leaf contains alkaloid, flavonoid, tannin and essential oil which have antibackterial activities. The aim of this study was to determine the acidity change (pH) of saliva in elderly people with diabetes mellitus type 2 after gargling of 10% boiled red betel leaves. The subjects of this study were 30 persons who divided randomly into two groups i.e treatment group and control group. Each group consisted of 15 persons. In the treatment group, the subjects gargled using 10% boiled red betel leaves, while in the control group the subject gargled using aquades. The saliva was collected on each time treated and followed by pH measuring. The data analysis was conducted by Independent t-test statistic (p≤0,05). The results showed that there was an effect of increasing salivary acidity (pH) of saliva after gargling boiled of red betel leaf (Piper crocatum) in elderly people with diabetes mellitus type 2. The change of acidity level (pH) of saliva was increased significantly at 5th to 15th minute from 5.33 to 6.67 after gargling boiled red betel leaves concentration of 10%. The acidity level range stated above indicates a normal
Pencucian material magnetik pasir besi lansilowo menggunakan larutan asam klorida Ricka Prasdiantika; Susanto Susanto
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.43985

Abstract

Iron sand was widely used in various fields such as in the manufacturing of magnets, cement, and steel. Iron sand has the main composition of iron oxide and several impurities of oxides. To remove these impurities, iron sand needs to be washed with acidic solution such as HCl solution. This study aims to minimize impurities in the magnetic material of Lansilowo iron sand. Iron sand was prepared using an external magnet to obtain magnetic material. The magnetic material was washed using distilled water and 0.5 M HCl solution. The drying process was carried out at 80oC for 24 hours. Magnetic material was crushed, weighed, and characterized. Material characterization was carried out using X-Ray Fluorescence (XRF), Fourier Transform Infrared (FT-IR) Spectrophotometer, and X-Ray Diffractometer (XRD). The Characterization results showed that washing of magnetic material using H2O-HCl 0.5 M was able to increase the percentage of Fe element composition in Lansilowo iron sand. The iron oxide contained in Lansilowo Iron Sand remains magnetite. The washing the iron sand magnetic material using 0.5 M HCl solution succeeded in removing impurities such as Mg, Pr, K, Cl, P, S, Co, Ce, and Sn as well as reducing the percentage of the Si and Al elements.The washing magnetic material using 0.5 M H2O-HCl produced higher XRD intensities than those washed with H2O. The washing magnetic material with 0.5 M H2O-HCl was result particle size of 37,70 ± 4,62 nm and crystallinity of 53.12%.
Pementaan dan faktor risiko sosioekonomi dan perilaku terhadap kejadian penyakit periodontal di kecamatan pundong kabupaten bantul Prayudha Benni Setiawan; Hartono Hartono; Regina Titi Christinawati Tandelilin; Bekti Nur&#039;aini
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.44013

Abstract

Periodontal disease is pathological damage that affects the tooth supporting tissues. Systemic conditions largely influence its pathogenesis. Besides, environmental, socioeconomic, behavioural, environmental and geographic factors can affect individuals experiencing periodontal disease. Geographic Information System (GIS) can be used to analyze the differences of these factors, especially those relating to geographic differences, demographic factors, social, etc. Pundong district has geographical and socio-economic variation. This study aims to describe the distribution of patients with periodontal disease based on socioeconomic and behavioral factors. The type of study was an observational analytic survey with a cross-sectional design. The subject of research is determined by Registry Based Study approach where Pundong Community Health Center as the primary data source in this research. Independent variable is periodontal disease, while the dependent variable is a socioeconomic factor and health behaviour. Overview of periodontal disease mapping using ArcGIS, with an overlay method or combining two layers, namely the administrative map of Pundong District and coordinates of patients with periodontal disease. Univariate and bivariate analysis using Stata to analyze the distribution and the relationship of each variable. Generalized periodontitis often occurs in Seloharjo. Seloharjo has the most deprived people in Pundong Sub-district. The variables significantly associated with periodontal disease severity were economic status and brushing behaviour (p-value <0.05).
Pola perkembangan morfologi fisik kota di cekungan bandung periode 2009 – 2018 Ramadhan Pasca Wijaya; Bowo Susilo; Prima Widayani
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.45051

Abstract

Land development will be occur from time to time, the developments phenomenon will have either positive or negative impact. The impact of this phenomenon will affect various aspects, such as socioeconomic, mobility, land quality, and more. So the study on land development is required to evaluate and anticipate the negative impact on some region. To do evaluating and anticipating unwanted impacts a study can be carried out to become the basis for regional development or regional planning. one of them is to examine the pattern of urban development that will be used as a reference for regional development planning that will occur in the future. This study aims to analyze the development of urban physical morphology in Bandung Basin period 2009 - 2018. The method in this research is quantitative descriptive in the form of data collecting, data processing, modelling, and mapping. The research method is quantitative and qualitative in the form of data collection, data processing, modeling and mapping. The method of applying quadrant and burgess models to find the value of built-up land density that can reflect information on the phenomenon of built-up area development seen from the built-up area density in each agreed zone with geometric and quadrant models. The results in this research shows that the morphological structure of developed land in Bandung Basin is concentric with the highest density of 0.3459 km² which is centered in Cimahi and Bandung, also development is elongated and along the road with the majority of the land development create a leapfrog pattern, so it can be concluded that urban morphology in Bandung Basin is concentric with the linear development which is leapfrog.
Optimalisasi kapasitas energi angin dan matahari dengan konfigurasi mikrogrid berdasarkan karakteristik beban Dhanis Woro Fittrin Selo Nur Giyatno; Lukman Bagus Subekti; Adlan Bagus Pradana; Indriana Nurmawati; Indra Wibowo
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.46109

Abstract

Diploma III Electrical Technology Study Program is a institutional vocational education institutional in Department of Electrical Engineering and Informatics that aims to produce graduate who are ready to work in operation and maintenance of power system. Since phenomena of scarcity of fossil fuels, study program meet the 2 major problems, namely the limitations of electrical energy for practical lab work and increased job skills on the electrical energy conversion of electrical energy from renewable energy. The purpose of this research is to optimalize capacity of solar and wind energy contained in the environment of the laboratory on the microgrid configuration, namely PV-Wind turbine-Battery. Software HOMER is used to simulate microgrid configuration with AC-DC load, AC load, and DC load. The results show indicate that microgrid PV-Wind turbine-Battery is more economically to meet the need AC-DC load than the others. 

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