Articles
<![CDATA[Item Response Theory Model Empat Parameter Logistik Pada Computerized Adaptive Test ]]>
<![CDATA[Fatkhudin, Aslam]]>;
<![CDATA[Surarso, Bayu]]>;
<![CDATA[Subagio, Agus]]>
<![CDATA[ JSINBIS (Jurnal Sistem Informasi Bisnis) Vol 4, No 2 (2014): Volume 4 Nomor 2 Tahun 2014 ]]>
Publisher : <![CDATA[Universitas Diponegoro ]]>
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DOI: 10.21456/vol4iss2pp121-129
<![CDATA[One of the computer-based testing is the Computerized Adaptive Test (CAT), which is a computer-based testing system where the items were given to the participants adapted to test the ability of the participants. Assessment methods are usually applied in CAT is Item Response Theory (IRT). IRT models are most commonly used today is the model 3 Parameter Logistic (3PL), which is about the discrimination, difficulty and guessing. However 3PL IRT models have not provided information more objectively test the ability of participants. The opinion of the test participants were tested items were also to be considered. In this study using CAT in combination with IRT model of 4PL. In this research, the development of CAT which uses about 4 parameters, namely the discrimination, difficulty, guessing and questionnaires. The questions used were about UAS 1 English subjects. Samples were taken from 30 students answer with the best value of the total 172 students spread across 6 classes to measure the parameter estimation problem. Further testing using CAT application 4PL IRT models compared to CAT 3PL IRT models. From research done shows that the CAT application combined with IRT models 4PL can measure the ability of the test taker shorter or faster and also opportunities participants correctly answered the test items was done tend to be better than the 3PL IRT models. Â Keywords: Ability; CAT; IRT; 3PL; 4PL; Probability; Test]]>
<![CDATA[Kombinasi Balanced Scorecard dan Objective Matrix Untuk Penilaian Kinerja Perguruan Tinggi ]]>
<![CDATA[Mahmudi, A Aviv]]>;
<![CDATA[Surarso, Bayu]]>;
<![CDATA[Subagio, Agus]]>
<![CDATA[ JSINBIS (Jurnal Sistem Informasi Bisnis) Vol 4, No 1 (2014): Volume 4 Nomor 1 Tahun 2014 ]]>
Publisher : <![CDATA[Universitas Diponegoro ]]>
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DOI: 10.21456/vol4iss1pp01-10
<![CDATA[Working Assessment is very essential aspect for a college to keep its excellent quality to face tight competition in either national or international level. The working assessment can be implemented to compare the result with organization strategy, and can also help to plan the upcoming strategy to achieve the final target of organization. The combination of Balanced Scorecard and OMAX is aimed at building the information system of working assessment in a college. Balanced Scorecard in the college is used to determine the strategic purposes, KPI and target, optimistic and pessimistic value. The scoring of each KPI uses AHP method; the scoring of KPI influences on general working score. The scoring of working assessment uses Objective Matrix (OMAX) method to know the total result indicator stated by the college, and can find out the total result indicator of each working criterion. The combination of BSC and OMAX can avoid the use of overwhelming data because this model focused on four perspectives, with the important key indicator of a college. Besides, the four perspectives can avoid the orientation of short-term target, because OMAX developed the more obvious frame of time that also focused on the long-term target. This combination was a good integration that can afford to modify hybrid model in determining the score card of a college. BSC changed into the form of OMAX that presented a target in the long period. This combination is also a good integration that can afford to modify a hybrid model in determining the scorecard of the college. BSC changes into the form of OMAX that presents the long-term target. Â Keywords: AHP; Balanced scorecard; OMAX; Work assessment; College]]>
<![CDATA[STUDI PENGARUH KONSENTRASI AL PADA STRUKTUR KRISTAL DAN MORFOLOGI FILM TIPIS AlxGa1-xN/Si(111) YANG DITUMBUHKAN DENGAN TEKNIK PA-MOCVD ]]>
<![CDATA[Heri Sutanto]]>;
<![CDATA[Agus Subagio]]>;
<![CDATA[Edy Supriyanto]]>;
<![CDATA[Pepen Arifin]]>;
<![CDATA[Sukirno Sukirno]]>;
<![CDATA[Maman Budiman]]>;
<![CDATA[Moehamad Barmawi]]>
<![CDATA[ Jurnal Sains Materi Indonesia EDISI KHUSUS: OKTOBER 2006 ]]>
Publisher : <![CDATA[Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency ]]>
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DOI: 10.17146/jusami.2006.0.0.5183
<![CDATA[STUDI PENGARUH KONSENTRASI AL PADA STRUKTUR KRISTAL DAN MORFOLOGI FILM TIPIS AlxGa1-xN/Si(111) YANG DITUMBUHKAN DENGAN TEKNIK PA-MOCVD. Film tipis AlxGa1-xN telah ditumbuhkan di atas substrat Si tipe-p dengan menggunakan teknik PA-MOCVD. Film tipis AlxGa1-xN ditumbuhkan dengan parameter-parameter: suhu substrat, laju alir N2, TMGa dan TMAl berturut-turut sebesar 700 oC; 90 sccm; 0,1 sccm dan 0,01sccm hingga 0,04 sccm. Film polikristal AlxGa1-xN yang ditumbuhkan mempunyai struktur heksagonal dengan bidang difraksi dominan (1010) dan (1011) hingga konsentrasi Al sebesar 6,78%. Diperoleh nilai kekasaran permukaan film dari pengukuran SPM pada range 11,44 nm sampai dengan 27,20 nm. Morfologi permukaan film semakin halus dengan peningkatan konsentrasi Al pada film. Penurunan nilai konstanta kisi hasil pengujian XRD terjadi karena kekosongan nitrogen pada film. Peningkatan konsentrasi Al pada film menyebabkan penurunan laju penumbuhan film tipis AlxGa1-xN yang terbentuk.]]>
<![CDATA[FABRIKASI FILM TIPIS SEMIKONDUKTOR FEROMAGNETIK TiO2-Co DENGAN TEKNIK MOCVD DAN PENGAMATAN MAGNETORESISTANSI ]]>
<![CDATA[Edy Supriyanto]]>;
<![CDATA[Horasdia Saragih]]>;
<![CDATA[Agus Subagio]]>;
<![CDATA[Maman Budiman]]>;
<![CDATA[Pepen Arifin]]>;
<![CDATA[Moehammad Barmawi]]>;
<![CDATA[Sukirno Sukirno]]>
<![CDATA[ Jurnal Sains Materi Indonesia EDISI KHUSUS: OKTOBER 2006 ]]>
Publisher : <![CDATA[Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency ]]>
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DOI: 10.17146/jusami.2006.0.0.5180
<![CDATA[FABRIKASI FILM TIPIS SEMIKONDUKTOR FEROMAGNETIK TiO2-Co DENGAN TEKNIK MOCVD DAN PENGAMATAN MAGNETORESISTANSI. Film tipis TiO2-Co telah berhasil ditumbuhkan di atas subtrat Si dengan teknik MOCVD. Film tipis TiO2-Co bersifat feromagnetik pada suhu ruang, dan memiliki respon magnetik lunak (soft magnetic). Penggunaannya sebagai material injektor pada divais spintronika berstruktur TiO2-Co/Si/TiO2-Co, diinvestigasi. Karakteristik arus-tegangannya, tanpa dan dengan medan magnetik luar, dianalisa. Teramati adanya pengaruh magnetik terhadap resistansi divais yang disebut sebagai magnetoresistansi. Magetoresistansi diperoleh bergantung pada besarnya tegangan bias yang diberikan pada divais. Penambahan tegangan ke suatu nilai tertentu dapat menghilangkan efek magnetoresistansi.]]>
<![CDATA[THE CALCINATION TEMPERATURE EFFECT ON THE ANTIOXIDANT AND RADIOPROTECTION PROPERTIES OF CeO2 NANOPARTICLES ]]>
<![CDATA[Iis Nurhasanah]]>;
<![CDATA[Weni Safitri]]>;
<![CDATA[Tri Windarti]]>;
<![CDATA[Agus Subagio]]>
<![CDATA[ Reaktor Volume 18 No. 1 March 2018 ]]>
Publisher : <![CDATA[Dept. of Chemical Engineering, Diponegoro University ]]>
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DOI: 10.14710/reaktor.18.1.22-26
<![CDATA[The CeO2 nanoparticles are very interesting to be studied as biomedical materials due to its unique physical and chemical properties. The non-stoichiometric properties of CeO2 play a role in the redox/catalytic processes that scavenging free radicals. These properties make CeO2 nanoparticles as being potentially antioxidant and radioprotector materials. In this paper, we report the calcination temperature effect on the antioxidant properties and radioprotective effect of CeO2 nanoparticles synthesized by precipitation method. The CeO2 nanoparticles were synthesized by precipitation method at various calcinations temperatures (300oC – 700oC). The formation of CeO2 nanoparticles and crystallite size was analyzed using X-ray diffractometers. The DPPH method was used to investigate antioxidant properties of CeO2. Dose Enhancement Factor (DEF) of CeO2 nanoparticles were determined by measurement of the absorbed dose of X-ray radiation (Linac 6 MV 200 MU). X-ray diffraction pattern showed formation of cubic fluorite of CeO2 nanoparticles with crystallite size in the range 9 nm-18 nm. Calcination temperature of 500oC resulted in CeO2 nanoparticles with the best antioxidant properties and lowest DEF value. The radioprotection effect of CeO2 nanoparticles was evaluated based on Escherichia coli survival toward X-ray radiation with a dose of 2 Gy. The CeO2 nanoparticles increased Escherichia coli survival of about 24.8% order. These results suggested that CeO2 nanoparticles may potentially be as radioprotector of X-ray Linac 6 MV. Keywords: Antioxidant, CeO2 nanoparticles, Dose Enhancement Factor (DEF), radioprotector]]>
<![CDATA[Effect of Silver Nano Particle Microalgae Chlorella pyrenoidosa and Dunaliella salina on Growth and Survival of Penaeus monodon Larvae ]]>
<![CDATA[Hermin Pancasakti Kusumaningrum]]>;
<![CDATA[Muhammad Zainuri]]>;
<![CDATA[Indras Marhaendrajaya]]>;
<![CDATA[Agus Subagio]]>;
<![CDATA[Widianingsih Widianingsih]]>;
<![CDATA[Hadi Endrawati]]>;
<![CDATA[Annisa Fadillah]]>;
<![CDATA[Muhammad Iskandar Zulkarnain]]>;
<![CDATA[Yuvita Muliastuti]]>;
<![CDATA[Imam Misbach]]>
<![CDATA[ Buletin Oseanografi Marina Vol 10, No 2 (2021): Buletin Oseanografi Marina ]]>
Publisher : <![CDATA[Universitas Diponegoro ]]>
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DOI: 10.14710/buloma.v10i2.35483
<![CDATA[Penaeus monodon is one of the most important farmed crustaceans. Its also known as Asia Tiger Shrimp because its carapace and abdomen are transversely banded with red and white. The use of synthetic antibiotic in aquaculture had caused problems related to health and environmental safety. Chlorella pyrenoidosa and Dunaliella salina are photosynthetic microalgae. Silver nano particle in microalgae C. pyrenoidosa and D. salina had synthesized and showed their growth stability. They offer a potency to be exploited to supported growth and survival of shrimp larvae. The objective of the study was the application of silver nano particle in microalgae C. pyrenoidosa and D. salina on P. monodon larvae. The research methodology was carried out by making microalgae C. pyrenoidosa and D. salina containing silver nano particle and used as feed of shrimp larvae. Observations were made on the growth and survival of shrimp larvae compared to both microalgae and common feed. The results showed that the P. monodon larvae have the higher growth and survival rate with microalgae C. pyrenoidosa at the beginning of their growth compared to D. salina. However, microalgae without nanosilver and common feed showed a better result for growth and activity of shrimp larvae.]]>
<![CDATA[PEMBUATAN KOMPOSIT CARBON NANOTUBE-POLYVINYL ALCOHOL (CNT-PVA) SERTA EVALUASI SIFAT MEKANIKNYA ]]>
<![CDATA[Tatang Wahyudi]]>;
<![CDATA[Metri Setyaningsih]]>;
<![CDATA[Agus Subagio]]>;
<![CDATA[Hendri Widiyandari]]>;
<![CDATA[Pardoyo Pardoyo]]>;
<![CDATA[Musni Ahyani]]>
<![CDATA[ Arena Tekstil Vol 27, No 1 (2012) ]]>
Publisher : <![CDATA[Balai Besar Tekstil ]]>
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DOI: 10.31266/at.v27i1.1167
<![CDATA[Perkembangan teknologi nanomaterial mendukung teknologi komposit. Komposit yang menggunakannanomaterial menghasilkan sifat mekanik yang lebih baik daripada komposit biasa. Komposit carbon nanotubes(CNT) berpotensi memiliki kekuatan tarik yang tinggi oleh adanya struktur tabung nanonya yang baik sebagaimatrik. Komposit CNT-PVA telah dibuat dengan metode pelarutan. Polyvinyl alcohol (PVA) dilarutkan dalam airbertemperatur 80°C, selanjutnya material CNT ditambahkan ke dalam larutan tersebut dengan variasi fraksi massaCNT terhadap PVA sebesar 10%, 20% dan 30%. Komposit CNT-PVA terbentuk setelah dikeringkan padatemperatur 80°C. Selanjutnya sifat mekanik komposit dikarakterisasi dengan uji kekuatan tarik. Hasil ujimenunjukkan bahwa komposit CNT-PVA dengan fraksi massa 20% CNT terhadap PVA menghasilkan modulusYoung yang paling besar yaitu 137,71MPa. Ketebalan komposit 0,94 mm yang dibangun oleh tiga lapis tipiskomposit CNT-PVA menghasilkan peningkatan modulus Young hingga 107,30%.]]>
<![CDATA[STUDI KARAKTERISTIK KELISTRIKAN KOMPOSIT CARBON NANOTUBE-POLYVYNILIDENE-FLOURIDE (CNT-PVDF) ]]>
<![CDATA[Maulidanir Rohman]]>;
<![CDATA[Agus Subagio]]>
<![CDATA[ Youngster Physics Journal Vol 2, No 2 (2013): Youngster Physics Journal April 2013 ]]>
Publisher : <![CDATA[Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro ]]>
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<![CDATA[Development of nanomaterial technology strongly supports advancements in composite technology. Composite that use nanomaterial produce better electrical properties than common composite. Carbon nanotubes (CNT) is one of nanomaterial with high conductivity, so it’s potentially used in composite for various aplication. This research combines Carbon Nanotubes (CNT) with Polyvynilidene Flouride (PVDF) for producing CNT-PVDF composite with high conductivity. CNT-PVDF composites were fabricated by solution processing method. PVDF was dissolved into distillated aceton then CNT was dissolved in acetone and added Triton X-100 4 ml. PVDF solution and the solution of CNT were stirred for 1 hour using a magnetic stirrer, then both were mixed and stirred at temperature of 40 ° C until the acetone evaporates. Composites were molded using a hot-pressing at a pressure of 1 MPa and a temperature of 200oC for 10 minutes. CNT-PVDF composite were characterized by a conductivity test to generate conductivity values. The results of the analysis of the test showed that the addition of CNT conductivity on CNT-PVDF composite increased conductivity values. In the mass percentage of CNT 2%, 4%, 6%, and 8% conductivity increased slowly. Improved high conductivity of CNTs obtained in the mass percentage of 10%. Key word : Carbon Nanotubes, Polyvynilidene Flouride, composite, and conductivity]]>
<![CDATA[SINTESIS LAPISAN TIPIS NANOKOMPOSIT TiO2/CNT MENGGUNAKAN METODE SOL-GEL DAN APLIKASINYA UNTUK FOTODEGRADASI ZAT WARNA AZO ORANGE 3R ]]>
<![CDATA[Rizky Bimanda Sakti]]>;
<![CDATA[Agus Subagio]]>;
<![CDATA[Heri Sutanto]]>
<![CDATA[ Youngster Physics Journal Vol 2, No 2 (2013): Youngster Physics Journal April 2013 ]]>
Publisher : <![CDATA[Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro ]]>
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<![CDATA[Nanocomposite thin film of TiO2/CNT as a photocatalyst material was synthesized using the sol-gel method with the dispersion of commercial TiO2 Merck in CNT. The crystal structure and nanocomposite thin film morfology of TiO2/CNT were characterized using X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). Sol TiO2 0.3 M was mixed into the sol CNT with mass ratio of CNT:TiO2 was 1:5. Sol TiO2/CNT was sprayed on a glass substrate that was heated at a temperature of 250 oC, then it was heated at the temperature of 450 °C for 60 minutes. Photodegradation was done by dipping the nanocomposite thin film of TiO2/CNT into 100 mL Azo Orange 3R dye sol 10 ppm, then was irradiated using UV light with a wavelength 380 nm. XRD pattern analysis showed that TiO2 has anatase structure with crystallite size at the range from 72-92 nm by using Scherrer equation. SEM image analysis showed that the grains of TiO2 sfreris pattern and was dispersed on CNT. Refluks TiO2/CNT nanocomposite thin film had been able to degrade Azo Orange 3R dye sol for 12 hours until percentage of 98,2% which was much better than the non reflux TiO2/CNT nanocomposite thin film as 97,2% and the TiO2 thin film as 90,9%. Keywords : TiO2, carbon nanotubes, thin film, nanocomposite, photodegradation, Azo Orange 3R dye.]]>
<![CDATA[STUDI PENGARUH LAJU ALIR LARUTAN PADA SISTEM DESALINASI METODE FLOW-THROUGH CAPACITOR (FTC) DENGAN ELEKTRODA DARI KARBON AKTIF DAN CARBON NANOTUBES (CNT) ]]>
<![CDATA[Romi Buana Puja Pangestu]]>;
<![CDATA[Agus Subagio]]>
<![CDATA[ Youngster Physics Journal Vol 2, No 3 (2013): Youngster Physics Journal Juli 2013 ]]>
Publisher : <![CDATA[Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro ]]>
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<![CDATA[The electrodes are made of a combination between the CNT and the activated carbon had been created as a method of desalination systems the flow-through capacitor (FTC). The FTC is one method desalination done by flowing salt water passed the between electrodes based on the principle capacitor. The addition of the CNT on activated carbon as electrode will hopefully increase the conductivity and resistivity on activated carbon reduces that provides increased absorption. System optimization testing FTC desalination is carried out by the time of voltage and variation flow rate solution.Fabrication of electrodes are made of mixed a primary ingredient CNT to the activated carbon with a comparison of 10:90 (% wt) and urotropin to the phenolic resin Binder ratio10:90 (% wt). Comparison of carbon : fastener end of 80:20. The electrodes are formed with method of hot-pressing and heated for 30 minutes at a temperature of 1800C . The electrodes are resistance tested and characterized using SEM to saw the shape of the morphology of the electrodes.Prototype tested results with 7 pairs of electrodes 10% CNT could separated a compound salt of solution 1785 mg/L during 120 minutes with a flow rate 5 mL/min of 57%. Tested by conduktivitimeter at flow rate variation 5, 15, 25, and 35 mL/min had the lowest concentration of the solution on the reduction in flow rate 5 mL/min. But the solution that had passed through the electrodes on the low flow are much less than with a high flow rate.Keywords : Electrodes, desalination, FTC, CNT, activated carbon.]]>
