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Pre and post Mount Merapi eruption of free air anomaly in 2010 Indriana, Rina Dwi; Brotopuspito, Kirbani Sri; Setiawan, Ari; Soenantyo, Tarcisius Aris
International journal of physical sciences and engineering Vol. 2 No. 3: December 2018
Publisher : Universidad Tecnica de Manabi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (987.047 KB) | DOI: 10.29332/ijpse.v2n3.231

Abstract

Mount Merapi eruption in 2010 was one type of eruption with large scale during the last 100 years. Eruptions that was occurred resulting topographic changes in the peak of Mount Merapi, and the possibility of changing the subsurface structure. The research was part of a large study that has been conducted to assess the subsurface changes of pre-and post-eruption of Mount Merapi in 2010. The study discussed observations of free air anomalies pre and after the 2010 eruption. There were grouped into three periods. Processing of air anomalies was free to use using the 2nd orde calculation method. The results obtained were the changes in the contours of the FAA Mount Merapi in 1988, 1998, and 2011 as a result of topographic changes that occurred in the peak area and the alleged dynamics of the surface. The dynamics at Mount Merapi in the 1988 to 2011 period occurred in the northwest, southeast, east, and northeast of the study area and southeast of the peak of Mount Merapi.
FABRIKASI DAN KARAKTERISASI NANOFIBER GELATIN DENGAN PENAMBAHAN CO-SOLVENT MELALUI METODE ELECTROSPINNING Setiawan, Ari
Hibualamo : Seri Ilmu-Ilmu Alam dan Kesehatan Vol 3 No 1 (2019): Volume 3 Nomor 1 Tahun 2019
Publisher : LPPM Universitas Hein Namotemo

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (877.066 KB)

Abstract

Pada penelitian ini telah dibuat nanofiber dengan beberapa variasi asam asetat dalam gelatin untuk mengetahui pengaruhnya terhadap morfologi nanofiber gelatin. Larutan gelatin dibuat konsentrasi 5 wt% sampai 40 wt%  variasi asam asetat 10%, 15% dan 20% dengan penambahan co-solvent ethylene glycol 1 ml dan tanpa co-solvent ethylene glycol. Rasio perbandingan massa gelatin:ethyelene glycol 19:1. Proses electrospinning dilakukan pada tegangan 15 kV dengan jarak 11 cm antara ujung jarum dan kolektor. Pengukuran pada larutan gelatin mencakup sifat pH, konduktivitas, viskositas dan tegangan permukaan. Hasil pengukuran larutan gelatin menunjukkan bahwa penambahan asam asetat dapat merubah sifat larutan tersebut. Semakin tinggi nilai viskositas larutan gelatin menyebabkan semakin besar diameter nanofiber. Semakin besar nilai  konduktivitas larutan gelatin menghasilkan nanofiber yang seragam. Semakin besar konsentrasi gelatin menyebabkan terjadinya kenaikkan nilai pH larutan gelatin dan nilai tegangan permukaan cenderung meningkat. Konsentrasi gelatin 30 wt% dengan menggunakan asam asetat 10%, 15% dan 20% serta penambahan co-solvent ethylene glycol 1 ml tanpa disertai bead-bead. Diameter nanofiber pada konsentrasi gelatin 30 wt% berturut-turut adalah 165?12 nm, 190?31 nm, 190?23 nm. Sedangkan hasil FTIR puncak serapan nanofiber gelatin lebih rendah dibandingkan dengan puncak gelatin serbuk.
PEMBELAJARAN BERJARAK SEBAGAI KEJADIAN LITERASI: STUDI TENTANG PROGRAM VIRTUAL SHARING DI RUANG BELAJAR AQIL Setiawan, Ari; Ramadhani, Iqbal; Ariwiguna, Wily
Journal of Documentation and Information Science Vol 3, No 1 (2019): Maret (Article in Press)
Publisher : Association of Indonesian Library and Information Professionals

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33505/jodis.v3i1.98

Abstract

The learning process changes from traditional becomes distance learning through the use of ICT. The learning process is part of knowledge management, both in individuals, groups and organizations. Ruang Belajar Aqil is a learning space for youth to learn from expertise dan practitioner in certain fields through Virtual Sharing activities. This research was conducted to find out information about distance learning as literacy event in RBA. Researchers used a qualitative approach to realize the concepts in this study. Researchers planned the result of this research can be used as program evaluation (Neuman, 2006), especially in the context of learning and learning for all parties involved.
PENGARUH PEMBERIAN PUPUK UREA TERHADAP PERTUMBUHAN SEMAI JATI (Tectona grandis L.f) PADA LAHAN BEKAS TAMBANG POBOYA Setiawan, Ari; Umar, Husain; Hamzari, Hamzari
Jurnal Warta Rimba Vol 7, No 1 (2019)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (238.853 KB)

Abstract

Teak (Tectona grandis L.f) is a timber commodity that has a very high economic value. High teak needs are not in line with the ability to procure teak wood which is still low. Teak growth is often hampered by improper growing conditions, especially in former mining areas. Gold mining activities will also cause a decline in soil microbial population, damage to flora and fauna and the production of tailings from these mining activities. This condition needs treatment through fertilizer application. Urea is a nitrogen fertilizer that is needed by plants to stimulate overall growth, especially stems, branches and leaves. The success of a plant does not escape the use of superior, healthy and quality seeds. The research was conducted for three months, namely from June to August 2016 at Poboya, Mantikulore District, Palu City, Central Sulawesi Province. The material used in the implementation of this study was Semai Jati (Tectona grandis L.F) and urea fertilizer. This study used a completely randomized design consisting of 6 treatments and 3 replications, so that there were 18 experimental / observation units. Sidik Ragam analysis was conducted to determine the effect of the treatment that was tried on teak seedlings. Honest Real Test (BNJ) is conducted to see the effect or treatment. The results showed that the treatment of urea fertilizer had a significant effect on the parameters of height increase and the number of teak seedling leaves, while the increase in diameter had no significant effect. The treatment of P1 (2 g / seed) gave the best influence on all parameters added to the teak seedlings observed.Keywords: Urea Fertilizer, Teak Seedlings, KPH, Poboya Mining Mine.
Inverse Modeling Using Taylor Expansion Approach and Jacobi Matrix on Magnetic Data (Dyke/Magma Intrusion Cases) Suprianto, Agus; Wahyudi, Wahyudi; Suryanto, Wiwit; Setiawan, Ari; Adhi, Aryono; Priyantari, Nurul; Supriyadi, Supriyadi; Subekti, Agus
Scientific Journal of Informatics Vol 6, No 2 (2019): November 2019
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sji.v6i2.19798

Abstract

The mathematical modelling of geological structures, i.e. magma intrusion or dyke, has been done,  based on magnetic data with inversion techniques using MatLab. The magnetic equation is a non-linear equation, and completion is done using a linear approach to non-linear mathematical models of magnetic data using the Taylor expansion approach and Jacobi Matrix. The first step of this research is to make synthetic data forward modelling from the magnetic equation of magma intrusion or dyke cases without errors, and the next stepping then add errors to the data. The next step is to do an inversion to get the parameters sought, i.e. depth and angle of the magma intrusion, by giving initial guesses, and then re-correct iteratively until convergent results are obtained. Finally, parameters of slope dyke or thin magma intrusion and its depth can be determined. The results obtained indicate that this technique can be used to get physical parameters sought from magnetic data for simple geological cases, i.e. dyke and magma intrusion.
INVERSI LINIER LEASTSQUARE DENGAN MATLAB ( Studi Kasus Model Gravitasi Bola Berlapis) Nurwidyanto, Irham; Setiawan, Ari
BERKALA FISIKA Vol 14, No 3 (2011): Berkala Fisika
Publisher : BERKALA FISIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (289.088 KB)

Abstract

The linear  least square Inversion have been made with matlab8 for a case study of layered ball with the aim to study the response of the gravitational field of a layered ball.The gravitational field of layered ball formulation described later the value  is calculated by programming in matlab. As the validation data is computed on the surface of the earth'sgravitational field with a case of six layers with different density and radius. The value aresuitable  to the real slate. After the results are appropriate, the results of  programming was made is used to calculate the gravitation field  of another layered ball object, the data is then used assynthetic data (considered as a data field) which is an inversion of input data on the program aremade.The results obtained in this modeling can be concluded that there are ambiguity from theinversion results, which means that the parameters which be obtained from the invertion methodare  very different to the riil parameter if not given early predictive value as the limit of theexpected value. By providing a limit value (the value of the initial estimate) the expected results ofthe inverse can provide results that correspond (nearly) true value.Key words: Inversion, Linier leastquare, layered ball
PEMODELAN ANOMALI GRAVITASI SESAR DENGAN PENDEKATAN MODEL SHEET (MODELLING GRAVITY ANOMALIES OF FAULT BY SHEET MODEL APPROACH) Nurwidyanto, M Irham; Setiawan, Ari
BERKALA FISIKA Vol 14, No 4 (2011): Berkala Fisika
Publisher : BERKALA FISIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (237.697 KB)

Abstract

AbstractThe modelling gravity anomaly of fault model with a model sheet approach with the aim to study the response of gravity anomalies of faults was done.Modelling is done by modelling approaches bedding with a thickness t and density contrastwith surrounding Δρ. The  gravity anomaly at a point are formulated and  the calculation andvisualization program created in matlab8RS. From the modelling is made it can be concluded that the fault position is generally locatedbetween the gravity anomaly minimum and maximum gravity anomaly. When thetypes of fault arevertical normal fault then the fault position precisely located on the horizontal gradient  maximumvalue, whereas when the fault are not vertical, the location of fault are  to be near (around) themaximum horizontal gradient.Key words: modelling, gravity anomalies, faults, model sheets.
PENGARUH ARUS DAN WAKTU TERHADAP LAPISAN ZINC PLATING PADA MATERIAL SGD400-D DENGAN MENGGUNAKAN PROSES ELEKTROPLATING Setiawan, Ari; Indrayani, Novi Laura; Herawan, Budi
Jurnal Ilmiah Teknik Mesin Vol 7 No 1 (2019): JURNAL ILMIAH TEKNIK MESIN
Publisher : Universitas Islam 45 Bekasi, Fakultas Teknik, Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (746.081 KB) | DOI: 10.33558/jitm.v7i1.1904

Abstract

This research was conducted to find the ideal current and time used during the plating process, because in every industry the most frequent problems are the thickness that coats the material and the corrosion rate of the material that causes the material to become damaged or no good. This study uses SGD400 carbon steel and zinc as a coating. The research was carried out on a tank containing various kinds of chemical liquids and using electric current as conductivity for the coating media. Analysis using layer thickness measurement using vernier caliper measuring instrument and weight loss method. The results obtained from searching the current and the ideal time using a current of 900 A and a time of 60 minutes is 0.015 mm or 15 μm thick and the SST test (Salt Spray Test) at 72 hours No White Rust and 168 Hours No Red Rust. And good coating results can be seen in microstructure testing using keyence microscope media
SCHEDULING FLEXIBLE MANUFACTURING SYSTEM WITH STACKER CRANE USING COLOURED PETRI NETS Setiawan, Ari; Sitepu, Teguh Ersada Natail
Jurnal Teknik Industri Vol 20, No 2 (2018): December 2018
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1484.83 KB) | DOI: 10.9744/jti.20.2.113-126

Abstract

Scheduling Flexible Manufacturing System (FMS) can increase production speed and accuracy. It because FMS has an ability to process various variety of product at same work station. However, FMS need efficient allocation of resources, for example: allocation of material handling equipment. This paper presents production scheduling FMS modelling to 24 jobs and 4 machines considering stacker crane. Coloured Petri Nets (CP-Nets) is the programming language which used to simulate model because it?s simplicity. This model consists two main model activities. The first one is Physical Activity (PA) which related to every activity that involve physical movement, including stacker crane processes. PA consist five CP-Nets models: loading/unloading station, stacker crane, machine, picking mechanism, and pallet stocker. The second activity is Logical Expression (LE) which related to the rules on how FMS should operate. LE consist three CP-Nets models: machine selection, pick-up request, and stage two procedure.  A simulation and numerical report show utilization level of all machines around 80-84% and stacker crane 8,74%. 
Pengaruh Lokasi dan Kualitas Pelayanan terhadap Keputusan Nasabah untuk Menabung di BMT Sumber Mulia Tuntang Tyas, Rizqa Ramadhaning; Setiawan, Ari
Muqtasid: Jurnal Ekonomi dan Perbankan Syariah Vol 3, No 2 (2012): MUQTASID: Jurnal Ekonomi dan Perbankan Syariah
Publisher : IAIN Salatiga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18326/muqtasid.v3i2.277-297

Abstract

This study discusses the influence of the quality of services consisting ofreliability, responsiveness, assurance, empathy and tangibles as well as thelocation of BMT and variables are the most significant influence on thecustomer’s decision to save in BMT Sumber Mulia. The method used in thisstudy is a quantitative approach, with the amount of the sample was 30respondents. The sampling technique used accidential sampling by applyingis linear regression analysis, which previously conducted validity and reliability. Based on these results, we can conclude. First, there was a significant effect of the quality of service which consists of reliability, responsiveness, assurance, empathy, and tangibles on saving decisions. This is evident from the results of the t test with a value of t count t table at the 5% significance level reliability (3.838 1.7011), responsiveness (2.121 1.7011), assurance (3.062 1.7011), empathy (4.760 1.7011), and tangibles (3.290 1.7011). There is a significant influence on the customer decision to save their money in BMT. Based on it location as the t test results are t count t table (3.480 1.7011), with a significance level of 5%. Third, empathy variables are variables that provide the dominant influence on the customer’s decision to saving. It can be seen from the significance value (0.000) is more significant than other variables. Then proceed with the reliability variables with a significance value (0.001), the variable of location (0,002), tangibles (.003), assurance (0.005) and responsiveness with a significance value (0.043). This means that the willingness of employees and managers are more concerned with to draw customer attention on saving their money