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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 8 Documents
 1 
Search results for , issue "Vol 9, No 1 (2019): December" : 8 Documents clear
Aplikasi Metode Resistivitas 2D untuk Menentukan Intrusi Air Laut di Lambada Lhok Aceh Besar Aceh Gartika Setiya Nugraha; Marwan Marwan; Akmal Muhni
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.34368

Abstract

Lambada Lhok is one of the coastal areas with the most severe water crisis in Aceh Besar, Aceh. Clean water crisis happening in the area because of their breach of saltwater into freshwater aquifers and also due to the large decrease in ground water level that resulted in seawater intrusion. This research was conducted on four lines at two locations, namely: 3 (three) lines in the village of Lambada Lhok and 1 (one) line in the village of Kajhu. Kajhu village was used as comparative data for areas that are free from the intrusion of sea water. The research method using 2D resistivity Wenner-Schlumberger configuration, while the data acquisition using the ARES equipment. Data analysis using Res2Dinv software to make 2-dimension (2-D) cross section model. Lambada Lhok village is an alluvial deposition with an average height of 0-5 meters above sea level (dpl). The subsurface lithology of the village lambada lhok consists of clay sand, sandy clay and clay. Based on the results of the analysis of resistivity values indicate that the suspected sea water intrusion in the village of Lambada Lhok reaches a depth of 29 meters. It can be concluded that the spread of sea water intrusion in Lambada Lhok beginning of the line LL 1, LL 2 to LL 3. Distribution of seawater intrusion are most severe in the trajectory LL 2 and began to decrease at LL 3 trajectory.
Analisis Niat Penggunaan Knowledge Management System pada Perusahaan Pupuk di Indonesia Feby Artwodini Muqtadiroh; Amna Shifia Nisafani; Muchammad Wijdan Alyosa
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.36411

Abstract

PT ABC is one of the state-owned companies and one of the fertilizer producers in Indonesia. At present PT ABC has implemented a Knowledge Management System (KMS) in Human Resources Department. KMS serves as a tool for employees to consult in various fields regarding knowledge sharing, as a source of information and administration processes for payroll, leave, pensions and others. However, the existence of KMS is unable to guarantee the employees feel helped, for example, old employees who do not understand technology will have difficulty running KMS and some employees are not accustomed to dealing with information technology because they are used to consulting with humans. To measure the level of KMS acceptance for employees at PT ABC, this research uses the Chorng-Shyong Ong model which is a Technology Acceptance Model (TAM) model by utilizing the Power Issues.The purpose of this study was to find out the level of KMS acceptance in PT ABC based on the perspective of employees by identifying the basic factors, which affect cognitively and affectively to increase the internal beliefs, attitudes, and employee intention to use KMS through the recommendations given for the system improvement. And the results of this study indicate that the factors of perception to the usefulness, perceived ease of use, and the influences of others positively influence the intention to use KMS in PT ABC. There are only 3 of 7 hypotheses were accepted in accordance with the conditions that exist in PT ABC for the implementation of KMS. Of the 3 hypotheses accepted, the recommendations for improvement are derived based on the employee's suggestion in open questionnaires.
Analisis Sistem Reliability dengan Pendekatan Reliability Block Diagram Rifda Ilahy Rosihan; Hari Agung Yuniarto
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.36758

Abstract

Rendahnya reliability suatu sistem dapat mengakibatkan timbulnya downtime. Sedangkan rendahnya availability dapat mengakibatkan turunnya performance dari suatu sistem karena banyaknya waste time. Sistem extrussion pada PT. X berbentuk countinous process, apabila salah satu komponen pada mesin mengalami kerusakan akan menyebabkan terhentinya proses. Terdapat lima belas mesin yang tersusun secara seri pada proses extrussion, yakni uncoiler, welding, looping,extruder 90. Extruder 70, microwave 1,microwave 2, oven 1, oven 2,oven 3, cooling batch, breaking, bending, pulling, dan cutting. Sistem extrussion digambarkan dalam diagram Reliability Block Diagram. Tujuan dilakukannya penelitian ini adalah memodelkan sistem dengan menggunakan metode Reliability Block Diagram, mengetahui reliability dari keseluruhan system, dan mengetahui critically equipment. Data yang diolah merupakan data kerusakan mesin dari tahun 2006-2017, kemudian data tersebut diolah untuk menentukan reliability dari masing-masing komponen. Software yang digunakan adalah Software Reliasoft Blocksim 11. Hasil dari penelitian ini adalah nilai reliability sistem 0,431407 dengan t 100 jam.
Pengaruh Material Konservasi Kolostrum terhadap Pelepasan Ion Ni Grahita Aditya; Hikmah Nuraini; Whinahyu Aji Sekarini
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.37727

Abstract

Nickel in orthodontic bracket will be released immediately in the oral cavity. The release of Ni ion may trigger type IV hypersensitivity reaction. Colostrum has a high content of lactoferrin which can inhibit T cells proliferation after nickel sensitization, and decrease oxidative stress. Adding potassium sorbat 0.5%, or fermentation of colostrum may extend colostrum storage. The purpose of this research is to know the difference of nickel ion release in colostrum with 0.5% potassium sorbat addition and fermented colostrum. Methods of the study were laboratory experimental with four groups, colostrum and 0.5% potassium sorbat, fermented colostrum, sodium fluoride and artificial saliva. The sample was incubated in 40°C for 7 days. Nickel ions was measured using an inductively coupled plasma-optical emission spectrophotometry (ICP-OES Perlun Elmer Optima 8300®). Ni ions release differences were tested using the Kruskall-Wallis and Mann Whitney test.The lowest rate of Ni ion release wasfound in the colostrum group with 0.5% potassium sorbat followed by the fermented colostrum group. Kruskal-Wallis test no significant difference (p> 0,05) in each study group. The Mann Whitney test found significant differences between colostrum solution with 0.5% potassium sorbat and sodium fluoride, and also artificial saliva. The results concluded that colostrum with 0.5% potassium sorbat inhibit the release of Ni ions.
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.
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.
Pengaruh Desain Stent pada Jumlah Limfosit dan Trombosit Kelinci (Oryctolagus Cuniculus) Widowati Siswomihardjo; Dyah Anindya Widyasrini; Dinar Arifianto; Setyo Budhi; Nahar Taufiq
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.51526

Abstract

Percutaneous Coronary Intervention (PCI) is an effective treatment for coronary artery diseases. For the procedure, a stent is put in the coronary arteries. There are a variety of stent materials and designs available on the market. The development of stents continues with the goal to reduce the risk of failure. The design and the ability of the stent as a vascular scaffold are important factors for the success of the stent. The implantation of a stent as a foreign body can lead to inflammation. In general, the inflammation is characterized by an increased number of lymphocytes. Then, platelets play a role in coordinating the occurrence of inflammation and immune response. This study aims to determine the effect of stent design on the number of lymphocytes and platelets as a marker of inflammation. The study was conducted on ten rabbits divided into two treatment groups, namely KP1 (new design stent) and KP2 (commercial stent) by placing a stent on the iliac artery. One hour before stenting, 2 ml of blood was collected in all experimental animals. Then, 2 ml of blood was collected again on the 7th and 28th day after stenting.  Data was collected based on the number of lymphocytes and platelets from all experimental animals. Statistical analysis using two-way ANOVA shows no significant difference (p> 0.05) on the number of lymphocytes and platelets between the two groups with different stent designs. It can be concluded that the design of a stent does not show a tendency to cause inflammation.

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