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All Journal Jurnal Ilmu Dasar IPTEK The Journal for Technology and Science INDONESIAN JOURNAL OF APPLIED PHYSICS Communications in Science and Technology SEMAR Prosiding University Research Colloquium Bulletin of Chemical Reaction Engineering & Catalysis
Budi Purnama
Universitas Sebelas Maret (UNS)
Humanities Astronomy Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Education Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Physics Social Sciences

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Sensitive Magnetic Field Sensor Based on Compensated Double Pick Up Coil Purnama, Budi; Suharyana, Suharyana; Sutomo, Artono Dwijo
IPTEK The Journal for Technology and Science Vol 23, No 1 (2012)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v23i1.16

Abstract

Sensitive magnetic field sensor based on compensated double pick up coil has been developed. In order to confirm sensitifity of modified design, experiment carried out in two steps. Firstly, sensitify of conventional design is clarified. Here pick up coil as an active sensor and solenoid as an exitation coil is separately made. Secondly, modified sensor of integrated configuration is developed. Here for both active flux gate sensor and the exitation coil is made in same one core magnetic. Ferrite and standar foil soft magnetic is utilized in this experiment. In attention, frequency of 50 Hz is used for the whole experimens. A result showed that sensitvity of the integrated configuration sensor is much larger than conventional one. Then, power consume of the integrated flux gate sensor is much lower than conventional. Finally, a range measurement of the integrated configuration sensor can be realized less than 20 T which potential may perhaps sense a change of natural local magnetic field.
Demonstration of Magneto-Impedance Sensor on Multilayer Coil [Ni80Fe20/Cu]N Result of Electro-Deposition Nahrun, Ahmad Asrori; Wicaksono, B. Anggit; Ismail, Ismail; Nuryani, Nuryani; Purnama, Budi
Jurnal ILMU DASAR Vol 17 No 2 (2016)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (381.191 KB) | DOI: 10.19184/jid.v17i2.2688

Abstract

Demonstration performance magneto - impedance sensor on the coil wire multilayer [ Ni80Fe20/Cu ]N electro - deposition results presented in this paper . At first multilayer [ Ni80Fe20/Cu ]N deposited on a Cu wire into a coil and then the sample is modified by the number of windings 2 and 4. The results of impedance measurements under the influence of the magnetic field shows that the magneto - impedance ratio increases with the increase in the number of windings. Magneto - impedance ratio changed from 15 % to 17.4% with a change in the number of windings of 2 to 4. The fact these results allegedly contributed their self-inductance value of this magnitude greater contribution to the increase in the number of windings.Keywords: Magneto - impedance sensor, electro-deposition , multilayer coils [Ni80Fe20/Cu]N
Annealing temperature modify of crystalline structure, magnetic properties and antibacterial performance in nickel substituted cobalt ferrite nanoparticles utilizing natural-fine-sediment Bestari, Laksmita Farah; Iqlimatussholihah, Lathifah; Prasetya, Nurdiyantoro Putra; Kusumandari; Utari; Riyatun; Purnama, Budi
Communications in Science and Technology Vol 9 No 2 (2024)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.9.2.2024.1495

Abstract

This study details the nickel-substituted cobalt ferrite nanoparticle employing natural fine sediment (NiCFO-fs) annealing temperature dependency of crystalline and magnetic characteristics. The NiCFO-fs nanoparticles were prepared by the coprecipitation method with varying annealing temperatures (200-500°C with increment of 100°C for five hours). As a comparison, Ni-CFO was also synthesized using pure analytical chemicals (NiCFO-pa). The XRD results showed that the whole Ni-CFO nanoparticles established an inverse spinel face center cubic (fcc) order according to space group Fd-3m for both NiCFO-fs and NiCFO-pa. There was no additional peak, indicating that Ni2+ cations successfully substituted in cobalt ferrite nanoparticles. In case of NiCFO-fs nanoparticle samples, a crystallite size (D) decreased with the increasing annealing temperature (Ta), namely 45.72 nm, 37.35 nm, 25.95 nm, and 20.51 nm. In contrast to NiCFO-pa, the D increased with the increase of the Ta, i.e., 19.67 nm, 20.74 nm, 21.99 nm, and 23.33 nm. Meanwhile, FTIR results showed the presence of metal-oxygen bonds at 551-586 cm-1 and 384-391 cm-1 at tetrahedral (k1) and the octahedral (k2) sites for both NiCFO-fs and NiCFO-pa nanoparticles samples. The VSM result showed that a narrow hysteresis curve was observed for the NiCFO-fs sample compared to NiCFO-pa. The NiCFO-fs nanoparticles owing the smallest coercive field (HC) of 79.5 Oe were attained for the Ta of 300°C. In case of NiCFO-fs samples, magnetization saturation (MS) decreased with the increase of the Ta in contrast to NiCFO-pa samples. Here, the redistribution of two and three plus ions in the sub-lattice k1 and k2 locations should be encouraged by the Jahn-Teller phenomenon through strain-induced magnetism. The findings of the antibacterial test indicated that the potential of NiCFO based on natural materials (fine sediment) was higher than that of NiCFO based on pure analytical chemicals. This result was also supported by the emergence of ZOI magnitudes for all NiCFO-fs materials compared to NiCFO-pa that was only at Ta = 300°C.
Strategi Komunikasi Code Switching oleh Pembelajar Bahasa Inggris Fauziati, Endang; Purnama, Budi; Ovita, Lala Devi; Kusumaningsih, Cyntia Mahardhika
Prosiding University Research Colloquium Proceeding of The 11th University Research Colloquium 2020: Bidang Sains dan Teknologi
Publisher : Konsorsium Lembaga Penelitian dan Pengabdian kepada Masyarakat Perguruan Tinggi Muhammadiyah 'Aisyiyah (PTMA) Koordinator Wilayah Jawa Tengah - DIY

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Penelitian ini bertujuan untuk mengkaji tipe-tipe dan realisasi penggunaan strategi komunikasi Code Switching yang digunakan oleh siswa Sekolah Menengah Pertama saat berkumunikasi dalam bahasa Inggris sebagai bahasa asing. Penelitian ini menggunakan pendekatan kualitatif. Subjek penelitian adalah 30 siswa SMP N IV Surakarta. Obyek penelitian adalah tipe-tipe dan realisasi penggunaan strategi komunikasi Code Switching yang digunakan siswa saat berkumunikasi dalam bahasa Inggris. Data dikumpulkan lewat sistim pancing, siswa diberi tugas untuk mendiskripsikan sebuah kartun; ujaran mereka di rekam dan dijadikan sebagai sumber data membuat karangan bebas dalam bahasa Inggris. Data dianalisis secara kualitatif dengan teknik induktif dengan memanfaatkan kerangka analisis Dornyei dan Myers-scotton. Temuan penelitian diinterpretasikan dengan menggunakan teori yang relevan. Hasil penelitian menunjukkan bahwa pembelajar menggunakan tiga macam alih kode, yaitu: alih kode tag, alih kode intra sentential, dan alih kode inter-sentential. Dan ada tiga faktor yang berkontribusi terhadap penggunaan alih kode ini, yaitu penguasaan dua bahasa atau bilingual, keterbatasan penguasaan bahasa Inggris, dan sebagai strategi kompensasi. Dapat disimpulkan bahwa penggunaan alih kode oleh pembelajar Bahasa Inggris sebagai bahasa asing merupakan hal yang wajar dan tak terhindakan. Karena alih kode merupakan salah satu strategi komunikasi untuk mengkompensasi keterbatasan penguasaan kebahasaan bahasa sasaran.
Lanthanum-substituted Cobalt Ferrite Established by the Co-precipitation Process: Annealing Temperature Adjustment of Structural, Magnetic, and Dye Removal Characteristics Rahmawati, Ramadona; Musadewi, Adiana; Prasetya, Nurdiyantoro Putra; Suharno, Suharno; Budiawanti, Sri; Rahardjo, Dwi Teguh; Riyatun, Riyatun; Utari, Utari; Iriani, Yofentina; Nuryani, Nuryani; Purnama, Budi
Bulletin of Chemical Reaction Engineering & Catalysis 2023: BCREC Volume 18 Issue 4 Year 2023 (December 2023)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.19638

Abstract

Co-precipitation process was used for the synthesis of lanthanum-substituted cobalt ferrite nanoparticles at several annealing temperatures (Ta), i.e., 200 °C, 300 °C, and 400 °C, for 5 h. XRD spectral depicted that the produced nanoparticles sample indicates a single phase of fcc inverse spinel conforming to ICDD No 22-1086. The crystallite size (D) calculation at the strongest peaks shows the increase in enhancing the Ta i.e., 18.99 nm, 19.90 nm, and 23.21 nm for 200 °C, 300 °C, and 400 °C, respectively. The FTIR results showed absorption band at the tetrahedral site, v1 ~575 cm−1 and the octahedral site, v2 ~474 cm−1. The absorption bands indicate that the lanthanum ions have successfully replaced the Fe3+ cations in the original cobalt ferrite structure. According to the hysteresis loop, the coercive field's (HC) magnitude falls from 700 Oe down to 550 Oe as Ta increases. This result is consistent with the anisotropy constant which decreased from 0.77×104 erg/cm3 to 0.56×104 erg/cm3. The obtained nanoparticles also showed superior performance (much larger than 95%) for dye removal of Congo red. Copyright © 2023 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Sistem Pengukuran Detak Jantung Janin Melalui Elektrokardiogram Abdominal dan Android Aji, Yusuf Anggara; Nuryani, Nuryani; Wiyono, Nanang; Yunianto, Mohtar; Purnama, Budi; Utari, Utari; Riyatun, Riyatun; Suharno, Suharno; Raharjo, Dwi Teguh
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 12, No 2 (2022): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v12i2.65287

Abstract

An android-based fetal heart rate measurement is presented in this article. The fetal heart rate was obtained from the mother's abdominal electrocardiogram which was then measured and processed by Raspberry pi using k-means. Raspberry pi processed results produce ECG signals and fetal heart rate which was displayed on Android devices in real-time. The android application can also save heart rate and ECG data or retrieve previously taken heart rate recordings. The system obtained that the average value of accuracy, sensitivity and predictive positive were 90.49%, 97.10% and 93.03%, respectively. The variation of the training time of the algorithm showed that the training time of 10 and 15 seconds mostly has better performance than the training time of 5 seconds.
Charge Carrier Mobility Analysis of Chlorophyll Thin Film Spirulina sp Produced by Spin Coating Mustain, Muhamad; Sulistyana, Defi; U, Utari; Purnama, Budi
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 4, No 01 (2014): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v4i01.1158

Abstract

Analysis of carrier charge mobility of Spirulina sp thin films produced by spin coating havebeen conducted. Measurement of carrier charge mobility has been done by I-V method.Mobility of carrier charge decreased with an increased of the layer number. It indicates that athreshold value of carrier charge of population number over flow on conduction band.
Comparison of Ni0.6Co0.4Fe2O4 and NiFe2O4 Nanoparticles for Magnetic Characteristics, Synthesized Using Co-Precipitation Method Utari, Utari; Dasi, Yeni Herlina K.; Purnama, Budi
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 12, No 1 (2022): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v12i1.59191

Abstract

Comparison of nickel Ni0.6Co0.4Fe2O4   and NiFe2O4 were studied. The co-precipitation method was performed for the whole sample. After annealing of 600°C for 4 hours, the nanoparticles samples evaluated their structural properties by using Fourier Transform Infra-Red (FTIR) and X-Ray Diffraction (XRD). The XRD pattern confirms that the whole samples have the crystalline structure of the face-centered cubic (fcc) inverse spinel. Furthermore, the lattice and crystallite size of NiFe2O4 increased when added Co2+. The FTIR spectrum showed two prominent absorption bands, i.e., at around k of 358 cm-1 and 588 cm-1, where metals at tetrahedral and octahedral sites reflect intrinsic vibrations, respectively.  Finally, the decrease of saturated magnetization MS from 22.2 emu/g and 9.92 emu/g replacement of Co2+ cation with Ni2+.
Pengenalan Aplikasi Elektronika Berbasis Android di Madrasah Aliyah Negeri 1 (MAN) Grobogan Utari, Utari; Nuryani, Nuryani; Riyatun, Riyatun; Purnama, Budi
SEMAR (Jurnal Ilmu Pengetahuan, Teknologi, dan Seni bagi Masyarakat) Vol 14, No 1 (2025): Mei
Publisher : LPPM UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/semar.v14i1.94407

Abstract

AbstractThe rapid development of science and technology in recent years has greatly affected the teaching and learning process, especially physics lessons in high school. One of the technology products that has been widely used in all levels of society, including by students both at the elementary level to universities, is the smartphone. This community service activity is intended to increase the knowledge and skills of high school students in using smartphones with the Android operating system in a more effective, interactive, and fun learning process. This activity is carried out through training with theoretical presentation methods, practice, and discussion (question and answer). Direct practice is carried out using electronic media in smartphones owned by each participant (student). The practice used Android to create simple programs with the koltin programming language. Kotlin programming language was chosen because it is simpler, safer, and more productive than other programming languages, especially in the context of Android application development. From the discussion at the end of the training, it was concluded that students' knowledge and interest related to Android applications in learning are increasing because learning is done with easy, interactive, and fun methods. In addition, there is a growing interest of the students to continue their studies in college, especially in S1 Physics FMIPA UNS.    Keywords: Android, Kotlin, Learning, Student Univer
Diseminasi Riset Kecerdasan Buatan Untuk Diagnosis Medis Berbasis Elektrokardiogram di Universitas Duta Bangsa Nuryani, Nuryani; Purnama, Budi; Legowo, Budi; Utari, Utari; Riyatun, Riyatun; Suharno, Suharno; Yunianto, Mohtar; Lestari, Wiji
SEMAR (Jurnal Ilmu Pengetahuan, Teknologi, dan Seni bagi Masyarakat) Vol 12, No 2 (2023): November
Publisher : LPPM UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/semar.v12i2.75521

Abstract

Kegiatan pengabdian masyarakat ini memaparkan diseminasi riset yang bertujuan untuk memperkenalkan konsep kecerdasan buatan (artificial intelligence/AI) dalam diagnosis medis berbasis elektrokardiogram (EKG) kepada para dosen di Fakultas Ilmu Komputer, Universitas Duta Bangsa. Kegiatan ini bertujuan untuk meningkatkan pemahaman para dosen tentang potensi aplikasi AI dalam bidang kesehatan dan memberikan wawasan baru mengenai penggunaan EKG dalam diagnosis gangguan kesehatan. Para dosen diajak untuk mempelajari aplikasi AI dan teknik-teknik yang digunakan dalam analisis EKG. Hasil dari kegiatan ini menunjukkan bahwa para dosen memiliki minat yang tinggi dalam menerapkan kecerdasan buatan dalam bidang medis, khususnya dalam diagnosis penyakit jantung melalui EKG. Mereka memahami potensi besar yang dimiliki oleh AI dalam meningkatkan akurasi dan kecepatan diagnosis, serta membantu dalam pengambilan keputusan klinis yang lebih baik.
Co-Authors Ahmad Asrori Nahrun, Ahmad Asrori Aji, Yusuf Anggara Artono Dwijo Sutomo B. Anggit Wicaksono, B. Anggit Bestari, Laksmita Farah Budi Legowo Dasi, Yeni Herlina K. Dwi Teguh Rahardjo Endang Fauziati Iqlimatussholihah, Lathifah Ismail Ismail Kusumandari Kusumaningsih, Cyntia Mahardhika Mohtar Yunianto, Mohtar Musadewi, Adiana Mustain, Muhamad Nanang Wiyono Nuryani Nuryani Ovita, Lala Devi Prasetya, Nurdiyantoro Putra Raharjo, Dwi Teguh Rahmawati, Ramadona Riyatun Riyatun, Riyatun Sri Budiawanti Suharno Suharno Suharyana Suharyana Sulistyana, Defi U, Utari Utari Utari Utari Wiji Lestari Yofentina Iriani Yundari, Yundari