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All Journal Marine Fisheries: Jurnal Teknologi dan Manajemen Perikanan Laut Jurnal Pendidikan Vokasi BERKALA FISIKA Jurnal Rekayasa Sistem Industri Warta Rimba Jurnal Teknologi Pendidikan MUQTASID Rekayasa Mesin Gravitasi Scientific Journal of Informatics Jurnal Ilmiah Teknik Mesin Jurnal Pengukuran Psikologi dan Pendidikan Indonesia (JP3I) REiD (Research and Evaluation in Education) Pendas : Jurnah Ilmiah Pendidikan Dasar Jurnal Telematika TEKNIKA JURNAL MUTIARA KESEHATAN MASYARAKAT Indonesian Journal of Community Services BALANCE: Economic, Business, Management and Accounting Journal Bearing : Jurnal Penelitian dan Kajian Teknik Sipil Jurnal Eduscience (JES) Jurnal Hibualamo : Seri ilmu-ilmu Alam dan Kesehatan Journal of Documentation and Information Science Authentic Research of Global Fisheries Application Journal (Aurelia Journal) Jurnal Civronlit Unbari Jurnal Akuntansi dan Manajemen Teacher in Educational Research Jurnal Komposit : Jurnal Ilmu-Ilmu Teknik Sipil International Journal of Mechanical Engineering Technologies and Applications (MECHTA) Jumper : Jurnal Mahasiswa Pendidikan Olahraga Jurnal Ekonomi Perjuangan (JUMPER) Proceedings Series on Social Sciences & Humanities ALMUJTAMAE: Jurnal Pengabdian Masyarakat Automotive Experiences Sepakbola Jurnal Talenta Sipil Journal of Management and Digital Business Procedia of Social Sciences and Humanities Measurement In Educational Research Jurnal Pembelajaran, Bimbingan, dan Pengelolaan Pendidikan Journal of Educational Sciences Dedikasi: Jurnal Pengabdian Kepada Masyarakat Indonesian Journal of Behavioral Studies Proceeding Applied Business and Engineering Conference Studies in English Language and Education All Fields of Science Journal Liaison Academia and Sosiety Jurnal Ekonomi, Teknologi dan Bisnis IMPACTS: International Journal of Empowerment and Community Services Tuladha : Jurnal Pendidikan Dasar Jurnal Medika: Medika
Ari Setiawan
Jurusan Teknik Sipil FT. UNDIP Jl. Prof. Soedarto SH. Tembalang, Semarang 50275
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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

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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

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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

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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
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 
Accuracy and Automatic Computation of Seismic Refraction: a case of Forward Modeling and Inversion Hiden, Hiden; B, Kirbani S; S, wiwit; S, Hadmoko D; Setiawan, Ari
Gravitasi Vol. 13 No. 1 (2014)
Publisher : Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/gravitasi.v13i1.4447

Abstract

It has been built a data processing program to perform the first arrival waktu tempuh inversion of seismic refraction profiles zero distance. Analysis of the first wave arrival time is obtained by 1) using two-way analysis of time-taking to control the accuracy of the passage and identify the mistakes geometry,, 2) parameterization slowness and intercept-time of travel-time, in which the velocity model and multi-layer thickness obtained by inversion LSQ method (unconstrained, constrained and Marquardt) on seismic refraction. For automatic calculation and accurate, we make a data processing program for the third inversion LSQ method. Analysis of the model resolution and measurement data to determine the optimal parameters of the model, the algorithm used Menke (1989). Resolution inversion results, we tested with: forward modeling, the level of misfit (error) and the convergence between the observed data and the model. Once the program is successfully tested on a number of data, then we apply to the real seismic. The results of field data inversion interpreted that the subsurface strata bedding row from the top (first layer) in the form of: soil, sand (loose), sand (saturated, loose) and sandstone, limestone. Resolution velocity and thickness in the forward modeling program: a) the error between: 10-17 - 10-5 and b) the residue of convergence is: 10-11-10-4, while the resolution of the results of the third inversion LSQ method on the field data, obtained misfit between: 10-17 - 10-4 and residual convergence between measurement data and the model are: 10-11 -10-4.Keywords —seismic refraction, forward modeling, LSQ inversion, parameter models, resolution.
OPTIMASI PARAMETER PROSES PEMBENTUKAN SHOT PEENING DALAM MEMINIMASI PENYIMPANGAN TINGGI LENGKUNG ALMEN (STUDI KASUS DI PT. DIRGANTARA INDONESIA) Aritonang, Yoon Mac Kinley; Setiawan, Ari; Chandra, Ronny Hernawan
Jurnal Telematika Vol. 7 No. 1 (2011)
Publisher : Yayasan Petra Harapan Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61769/telematika.v7i1.48

Abstract

Pesatnya perkembangan industri manufaktur merangsang tumbuhnya kebutuhan akan komponen logam yang sesuai dengan spesifikasi. Spesifikasi komponen logam tidakhanya meliputi bentuk fisik yang semakin rumit, tetapi juga meliputi struktur dan kekuatan material. Proses shot peening merupakan salah satu proses pembentukan yang dapat mengakomodir tuntutan akan kekuatan permukaan dari suatu komponen logam. Kriteria keberhasilan proses shot peening ini ditentukan oleh tinggi lengkung almen yang terjadi. Tinggi lengkung almen yang sesuai dengan spesifikasi yang diinginkan, tentunya mengisyaratkan bahwa proses shot peening yang dilakukan telah berhasil. Saat ini, pada divisi aero manufacturing PT. Dirgantara Indonesia diketahui bahwa terjadi penyimpangan tinggi lengkung almen dari target yang diinginkan. Walaupun penyimpangan ini masih dalam batas toleransi yang ditetapkan, namun improvement pada proses berupa usaha untuk meminimasi penyimpangan ini tetap diperlukan. Oleh karena itu, penelitian ini diharapkan dapat membantu mengidentifikasiparameter apa saja yang mempengaruhi penyimpangan tinggi lengkung almen, dan selanjutnya mencari solusi yang tentunya bertujuan untuk meminimasi tinggi lengkung almen tersebut. The fast industrial development of manufactures stimulates the growth of metal components requirements based on the proper specification. The specification of metal components does not only cover the physical form which is being more complicated, but also covers the structure and material strength. The shot peening process represents one of forming processes which can accommodate the surface strength demand of metal components. The efficacy criterion of this shot peening process is determined by the almen arch height. The almen arch height suitable to the wanted specification, perhaps signs that the process of shot peening has been done successfully. Now in the division of aero manufacturing at PT. Dirgantara Indonesia detected that it had been occurring the high deviation of the almen arch height from the wanted goals. Although this deviation is within specified tolerance, but the improvement of process in the form of effort for minimizing this deviation remains to be needed. Therefore, this research which is expected can  assist to identify any parameters influencing the almen arch heightdeviation, and then looks for the solution which perhaps aim to minimizing the almen arch height.
Co-Authors ., Susan A.A. Ketut Agung Cahyawan W Ab Ghani, Hawa Husna Abdul Basith Abdul Rahim Abdullah Umar, Abdullah Achmad Baidowi, Achmad Ade, Kornelius Adnan, Nor Syamimi Mohamed AF, Oca Fernandes Agoes Santoso Agus Subekti Agust, Krisit Ahmad Kholil Akbar Al Masjid Amsori M Das Anderson, Ganda Andrian, Dedek Apriyanto, Mulono Ariwiguna, Wily Arum Putri Rahayu Aryono Adhi, Aryono Asih, Eka Kurnia Astuti, Nuryani Dwi As’ad, Ihwana Azmi, Zul Bimansyah, Willyam Budiman Budiman Candra, Rizal Nufal Chandra, Ronny Hernawan Chayati, Nurul Dardjito, Hanandyo Darmadi, Djarot Bangun Darwis, Nurizah Binti Mohamed Das, Amsori M. Daulay, Dicky Edwar Dendo, Anastasia Datam Diah Indriani Dian Purnamasari Didik Rinan Sumekto Diharjo, Diana Hafilda Digdho Djarot B. Darmadi, Djarot B. Dona Setya Dwi Susanto Dwiretnani, Annisaa Dwiyati, Siska Titik Eka Setiawati Elroy, Mikha Elvira handayani Enggar Kartikasari, Enggar Epi Supriyani Siregar Evi Susilawati Fakhrul Rozi Yamali Farida Agus Setiawati fatimah Fatimah Fatin Nadifa Tarigan Firdaus, Muhamad Yusuf Fitri Amalia Gary, Joshua Gunarto, Frendy Z. Hadmoko D S, Hadmoko D Hamzari Hamzari Hane, Thomas Didimus Hanna, Tabitha Harsono, Muhamad Sarbani Harun, Makmur Herawan, Budi Heri Retnawati Hidayatullah, Rizqy Hiden Hiden Hilmanto, Malvin Hurairah, Abi Husain Umar Ika Dyah Kumalasari Ika Purnama Sari Ikhsani, Mifta Kurnia Indriana, Rina Dwi Irham Nurwidyanto K, Antonius Candra Khairas, Eri Ester Khilian, Abdul Mutalib Khofifah, Nor Khosiyono, Banun Havifah Cahyo Kinley Aritonang Kirbani S B, Kirbani S Kirbani Sri Brotopuspito Kristina, Sonna Kristy, Kristy Kusuma, Andri Laxmi, Laxmi Lukman Handoko Lukman Nasution Mahatwan, Dian Mami Hajaroh Marsum Marsum Martadinata, Sanjaya Maulida, Minati Mualim, Rahmat Muflihah Isnawati Muhammad Ali Gunawan Muhammad Fajri Mulia, Citra Muryadin, Muryadin Muttaqie, Teguh Noor, Fariz Novi Laura Indrayani, Novi Laura Nurul Priyantari Pakpahan, Eka Kurnia Asih Pratama, Danang Budi Pratama, Rizki R Prayoga, Arif Priono, Joko Priyani, Diah Indah Puji Hastuti Rahmatullah, Muhammad Imam Ramadhan, Aldo Reghan Ramadhani, Iqbal Rauza Sukma Rita Rezvani, Rifki Riananda, Agif Rolls, Nicola Rosid, Muhammad Alfan Rukmini Rukmini Rulhendri Rulhendri Rustam, Fradilah Saputri, Hafizah Rahma Saputro, M. Elan Sarim, Sandria Setiawati, Marla Setiyobudi, Nanang Sidik, Muhamad Fajar Sihombing, Roy Freddy Sinulingga, Timothy Oktavianus Siregar, Januar Parlaungan Sitepu, Teguh E. N. Sitepu, Teguh Ersada Natail Siti Maesaroh Siti Nurhayati Soenantyo, Tarcisius Aris Sri Murlianti Sri Widiyati, Sri Sufiyanto, Muhammad Imam Suhaila Husna Samosir Suhendar, Satrian Suhendra Suhendra Suparmin Suparmin Supriyadi Supriyadi Supriyanto, Rahmat Suryanto, Wiwit Sutarman Syaefudin, Eko Arif Syafriani Syafriani, Syafriani Syarief Fajaruddin T, Riki Tapotubun, Alfonsina M. Tengku Riza Zarzani N Trisnowati Josiah Tyas, Rizqa Ramadhaning Uslan Utami, Lastuti Utomo, Anggoro Prasetyo Valiant, Vincent Vina Sari Yosephine Wahyudi Wahyudi Wahyudi, Danial Wahyudin Wahyudin Wanto, Endra Wardani, Ken Ratri Wari Dony Wati, Ilma Wiwit Rahina Widananda, Charisma Wulan Wijaya Kusuma Rahadi, Cakra wiwit S, wiwit Yahya, Indra Nur Yohanes Setiawan Yuldashev, Azim Abdurakhmanovich Yuli Prihatni Yulian Findawati Yunitasari, Cindy Fatma Zarochman, Zarochman