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All Journal Inovasi Pendidikan Fisika Jurnal Neutrino : jurnal fisika dan aplikasinya Jurnal Fisika Unand JFA (Jurnal Fisika dan Aplikasinya) Berkala Ilmiah Pendidikan Fisika Spektra: Jurnal Fisika dan Aplikasinya PENDIPA Journal of Science Education JPF : JURNAL PENDIDIKAN FISIKA Jurnal Ilmu Fisika Indonesian Physical Review Madaniya Lumbung Inovasi: Jurnal Pengabdian Kepada Masyarakat Inovasi Fisika Indonesia (IFI) Prisma Sains: Jurnal Pengkajian Ilmu dan Pembelajaran Matematika dan IPA IKIP Mataram

Frida Ulfah Ermawati

Physics Department, Faculty Of Mathematics And Natural Sciences, Universitas Negeri Surabaya

Author-ID : 260486

Religion Aerospace Engineering Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mathematics Physics Social Sciences Other

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Characterization of (Mg1.0Zn0.0)TiO3+4 wt%Bi2O3 Ceramics for Application as Resonator in Dielectric Resonator Oscillator Circuit Izza, Lailatul; Ermawati, Frida Ulfah
Jurnal Ilmu Fisika Vol 13, No 2 (2021): Published in September 2021 (COMING ISSUE)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.13.2.62-69.2021

MgTiO3-based ceramics have potential applications in telecommunications systems at microwave frequencies, such as resonators in dielectric resonator oscillator (DRO) circuits. This paper reports the results of (Mg1.0Zn0.0)TiO3+4wt% Bi2O3 (abbreviated MZT0+4wt%Bi2O3) ceramic fabrication to assess its potential to be used as a resonator in the DRO circuit. We characterized its structure, microstructure, and bulk density. The addition of 4wt%Bi2O3 to MZT0 crystalline powder was carried out via ball-mill. The milled powder was compacted using a die press to obtain pellets. All pellets were sintered at 1100ÂºC for 4, 6, and 8 h. Ceramic structures of the 4 and 6 h holding time consists of MgTiO3 phase (94.33Â±2.68) and (95.34Â±1.95)% molar respectively, while the rest phase was TiO2. The 8-h ceramic structure comprises (96.11Â±2.94) % molar MgTiO3 accompanied by Mg2TiO5 and TiO2. The ceramics' microstructure consists of a cluster of grains with an average diameter of 1.32-2.24 Î¼m and pores. Bulk density decreases with the increase of sintering holding time. The DRO characterization records a resonance signal each at 5.207, 5.005, and 5.121GHz with power approaching 0 dBm, suggesting that the MZT0+4wt%Bi2O3 ceramics can be used as a resonator in the DRO circuit working in microwave frequencies, especially at 5.0-5.2GHz.

THE USE OF (Mg0.9Zn0.1)TiO3+2wt.% Bi2O3 CERAMICS AS A DIELECTRIC RESONATOR OSCILLATOR MATERIAL AND CHARACTERISATION OF STRUCTURE, MICROSTRUCTURE, AND DENSITY Kadarosman, Afandy; Ermawati, Frida Ulfah
Jurnal Neutrino Vol 13, No 2 (2021): APRIL
Publisher : Department of Physics, Maulana Malik Ibrahim State Islamic University of Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18860/neu.v13i2.11720

Magnesium titanate (MgTiO3)-based ceramics have the potential for use in the telecommunications industry at microwave frequencies, including as a resonator in dielectric resonator oscillator (DRO) circuit. This research is intended to study the application of (Mg0.9Z0.1)TiO3+2wt.% Bi2O3 (abbreviated MZT01-2) ceramics as DRO material and characterize the structure, microstructure, and bulk density. Fabrication was carried out by ball milling between (Mg0.9Z0.1)TiO3 crystalline powder and 2wt.% Bi2O3 powder. The milled powder was compacted at certain pressure using a die press to become pellets. All pellets were sintered at 1000, 1100, 1200Â°C for 4 h to obtain ceramics. The structural characterization using XRD showed that the three ceramics contained the main MgTiO3 phase, each 93.63, 93.83, and 90.78% molar, the rest was the MgTi2O5 phase. The increase in sinter temperature causes the lattice parameter and the unit cell volume to decrease. The Archimedes bulk density was 2.928; 2.832 and 2.736 g/cm3. The microstructure is solid surfaces with a grain diameter of 1.9-2.3 Î¼m accompanied by pores. As DRO materials, the three ceramics exhibited a resonant frequency at 5.11, 5.08, and 5.12 GHz which shows that the ceramics can be applied as DRO materials at microwave frequencies. The sinter temperature variation tends not to affect the resonant frequency position.

Pengaruh Konsentrasi Larutan Terhadap Laju Pertumbuhan Kristal Tunggal Garam Rochelle (KNaC6H6O6.4H2O) Ermaningsih, Ernie; Ermawati, Frida Ulfah
Jurnal Fisika dan Aplikasinya Vol 3, No 1 (2007)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Laju penumbuhan kristal dipengaruhi beberapa hal antara lain sifat zat itu sendiri, suhu (larutan dan lingkungan), dan gangguan mekanik. Makalah ini berisi hasil kerja penelitian tentang pengaruh konsentrasi larutan terhadap laju perumbuhan kristal tunggal garam Rochelle. Konsentrsi larutan yang digunakan adalah 4,25 M,4,60Mdan 4,96Msuhu penumbuhan yang digunakan 30. Metode yang digunakan dalam penelitian ini adalah Slow Cooling. Hasil dari penelitian ini yaitu pada suhu 4,60 M mempunyai laju pertumbuhan yang paling optimum artinya pada konsentrasi tersebut kristal tunggal garam Rochelle dapat tumbuh dengan ukuran yang besar,dan bentuk yang paling sempurna pada waktu yang telah ditentukan (60 jam). Hasil difraksi sinar-X menunjukkan bahwa bahan serbuk dan kristal tunggal garam Rochelle yang ditumbuhkan mempunyai parameter kisi monoklinik, hal ini diketahui setelah nilai d dan 2 dari database dicocokkan dengan data pengukuran dan data perhitungan yang menggunakan rumus parameter kisi monoklinik (a=11,87A , b=14,32A , dan c=6,23A , = 89,4333).

Pengaruh Suhu Pertumbuhan terhadap Laju Penumbuhan Kristal Tunggal Garam Rochelle (KNaC6H6O6.4H2O) Thoifah, Thoifah; Ermawati, Frida Ulfah
Jurnal Fisika dan Aplikasinya Vol 3, No 2 (2007)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Laju penumbuhan kristal dipengaruhi beberapa hal antara lain sifat zat itu sendiri, suhu (larutan dan lingkungan), dan gangguan mekanik. Salah satu suhu larutan yaitu suhu pertumbuhan (Growth Temperature) dan makalah ini berisi tentang pengaruh suhu pertumbuhan terhadap laju penumbuhan kristal tunggal garamRochelle. Suhu pertumbuhan yaitu suhu larutan pada saat kristal tunggal tumbuh. Dalam penelitian ini, digunakan variasi suhu pertumbuhan 25C, 30C, dan 35C dan konsentrasi 0,0046 M. Metode yang digunakan dalam penelitian ini adalah Slow Cooling. Hasil dari penelitian ini yaitu pada suhu 30C mempunyai laju per-tumbuhan yang paling optimum artinya pada suhu tersebut kristal tunggal garam Rochelle dapat tumbuh dengan ukuran yang besar, dan bentuk yang paling sempurna pada waktu yang telah ditentukan (60 jam). Hasil difraksi sinar-X menunjukkan bahwa bahan serbuk dan kristal tunggal garam Rochelle yang ditumbuhkan mempunyai parameter kisi monoklinik, hal ini diketahui setelah nilai d dan 2 dari database dicocokkan dengan data pengukuran dan data perhitungan yang meggunakan rumus parameter kisi monoklinik (a=11,87A , b=14,32A , dan c=6,23, =89,4333).

Karakterisasi Keramik (Mg0,8Zn0,2)TiO3+4wt% Bi2O3 sebagai Material Dielectric Resonator Oscillator, Struktur, Mikrostruktur dan Densitasnya Elga Nilawati; Frida Ulfah Ermawati
Jurnal Fisika Unand Vol 10 No 2 (2021)
Publisher : Universitas Andalas

Penelitian ini bertujuan untuk mengkaji potensi aplikasi keramik (Mg0,8Zn0,2)TiO3+4wt% Bi2O3 (disingkat MZT02+4wt%Bi2O3) sebagai resonator pada rangkaian dielectric resonator oscillator (DRO) yang bekerja pada daerah frekuensi gelombang mikro, serta menguji struktur, mikrostruktur dan densitas bulk keramik. Fabrikasi keramik dilakukan dengan ball-milling antara serbuk kristalin MZT02 dengan 4wt% serbuk Bi2O3 pada kecepatan 500 rpm selama 5 jam. Serbuk hasil milling dikompaksi dengan hydraulic-hand press dan cylindrical die press untuk menghasilkan pelet. Semua pelet disinter pada suhu 1100Â°C selama 4, 6 dan 8 jam untuk menjadi keramik. Struktur keramik dengan waktu penahanan 4 dan 6 jam mengandung fasa MgTiO3=(97,87Â±8,24) %molar, sisanya fasa TiO2 rutil. Keramik dengan penahanan 8 jam mengandung fasa MgTiO3=(98,44Â±2,07) %molar, MgTi2O5=(1,49Â±0,30) %molar dan sisanya TiO2 rutil. Bertambahnya waktu tahan sinter relatif tidak menyebabkan perubahan ukuran parameter kisi, volume sel satuan sedikit berkurang dan densitas bulk juga berkurang dari 2,792, 2,776 menjadi 2,745 g/cm3. Mikrostruktur ketiga keramik berupa gumpalan butir dengan ukuran rata-rata 0,3-1,2 Î¼m disertai pori-pori. Karakterisasi DRO merekam frekuensi resonansi pada posisi yang sama untuk ketiga keramik, yaitu 5,12 GHz memberi bukti bahwa keramik uji dapat diaplikasikan sebagai resonator DRO pada frekuensi gelombang mikro dan variasi waktu tahan sinter tidak merubah performa tersebut.Â This study aims to examine the potential application of (Mg0.8Zn0.2)TiO3+ 4wt% Bi2O3 (abbreviated: MZT02+4wt% Bi2O3) ceramics as a resonator in a dielectric resonator oscillator (DRO) circuit operating in microwave frequencies and to examine its structure, microstructure and bulk density. Ceramic fabrication was carried out by ball-milling between MZT02 crystalline powder and 4wt% Bi2O3 powder at 500 rpm for 5 h. The milled powder was compacted using a hydraulic-hand press and a cylindrical die press to produce pellets. All pellets were sintered at 1100Â°C for 4, 6 and 8 h to become ceramics. The ceramic structure with 4 and 6 h holding time contains MgTiO3 phase = (97.87 Â± 8.24)% molar, the rest was TiO2 rutile phase. Ceramic with 8 h contained MgTiO3phase = (98.44 Â± 2.07)% molar, MgTi2O5 = (1.49 Â± 0.30) molar% and the remaining TiO2 rutile. Increasing the sinter holding time relatively did not change in the lattice parameter sizes, the unit cell volume was slightly reduced and the bulk density was also reduced from 2.792, 2.776 to 2.745 g/cm3. Microstructure of the three ceramics contain groups of grains with an average size of 0.3-1.2 Î¼m along with pores. DRO characterization recorded the resonant frequency at the same position for the three ceramics, namely 5.12 GHz, providing evidence that the ceramics can be applied as a DRO resonator at microwave frequencies and the variation in sinter holding time did not change this performance

Perancangan Alat Ukur Tegangan Permukaan dengan Induksi Elektromagnetik Indarniati Indarniati; Frida Ulfah Ermawati
Jurnal Fisika dan Aplikasinya Vol 4, No 1 (2008)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Tegangan permukaan merupakan sifat permukaan suatu zat cair akibat pengaruh tegangan. Guna mengetahui seberapa besar nilainya dilakukan pengukuran dengan menggunakan susunan alat hasil rancangan yang menggunakan sensor induksi elektromagnetik, menggantikan Newtonmeter yang selama ini dipergunakan. Perancangan tersebut dimaksudkan untuk mengetahui apakah sensor induksi elektromagnetik dapat dipergunakan sebagai pengganti Newtonmeter dalam pengukuran tegangan permukaan zat cair, dan dapat menunjukkan proses fisika yang terjadi selama pengukuran tegangan permukaan berlangsung karena mengetahui perubahan tiap gaya tarik yang terjadi selama pengukuran, nilai gaya tarik tersebut, serta nilai tegangan permukaan zat cair dapat diketahui secara langsung. Hal ini dimungkinkan karena data ditampilkan dalam bentuk grafik. Penelitian mencakup persiapan, perencanaan, dan perakitan alat sampai dengan pengujian (studi kelayakan) hasil rancangandengan menggunakan oli SAE 20W-50, oli SAE 30, dan bensin sebagai sampel uji.

Mechanical Wave Concepts: Composing of Five-Step Conception Diagnostic Test, Validity and Reliability Test, and Student’s Profile Conception Level Aretha Patricia Andriani; Frida Ulfah Ermawati
Berkala Ilmiah Pendidikan Fisika Vol 10, No 1 (2022)
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/bipf.v10i1.12364

A mechanical wave is one of the Physics concepts related to everyday life. When the Authors interviewed some students at one of Gersik’s senior high schools, the Authors found that some students didn’t understand the concepts yet. Students thought that when a rope was moved up-down, the particles in the rope would be moved horizontally. The truth is that there was no movement of particles in the vibrated rope. Misconceptions must be detected immediately so as not to interfere with students' understanding of the following concepts. One way is by using a conception diagnostic test. The paper aims to report the composition of the five-step conception diagnostic test for Mechanical Wave concepts, its’ validity and reliability, and use it to identify students’ profile conception level in a Gresik’s senior high school. This study used ADDIE (Analysis, Design, Development, Implementation, and Evaluation) model and data collection technique that used was developing of five-step question that passed through the validity and reliability stages. 13 questions were written and tested for their internal validity and 12 only questions declared valid 91.32%. The result of external validity in terms of a true fake (TF) and a wrong fake (WF) was 7.14% and 4.76% (valid as empirical content because of the TF and WF<10%). The conception diagnostic test was also valid as an empirical construct based on the Pearson Product Moment score because rab=0.575>rtable=0.4575 (significance level of 0.05), and 11 questions were finally declared valid and reliable. 40.40% of the 18 students for their profile conception level confirmed as Lack of Knowledge.

Optical Activity of an Asymmetric Substance Frida Ulfah Ermawati
Jurnal Fisika dan Aplikasinya Vol 6, No 1 (2010)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

This paper reported the investigation on the property of optical activity from three different isomers of L-, Dand DL--alanine (CH3CHNH2CO2H), a proposed radiation dosimetric material. The aim was to confirm the impact of attachment of -carbon atom of the systems to the four different groups, that is, the -carbon or methyl group, H-group, CO2H-group and NH2-group, to their response to any incoming plane-polarized light. Optical activity of a substance is a measure of the ability of a substance to rotate a plane of polarization, if solution of the substance is placed in the path of plane-polarized light. A polarimeter of Perkin-Elmer Model 141 with a Sodium lamp of 584-nm wavelength (D-line) and equipped with a digital counter was occupied in this work to measure the number of degrees of rotation of plane-polarized light at room temperature due to 8.3% concentration of each L-, D- and DL--alanine solutions. It was obtained that molecules of L-isomer rotate the counter of the polarimeter clockwise, from the observer’s point a view. While the molecules of D-isomer rotate the counter anti clockwise, at the similar amount of rotation. These results confirm the asymmetric structure belong to the -alanine system. Molecules of DL-isomer, however, do not rotate the counter at all. The existence of similar number of the D- and L-molecules in the DL-solution is the cause.

Pengembangan, Uji Validitas dan Reliabilitas Tes Diagnostik Five-Tier untuk Materi Getaran Harmonis Sederhana beserta Hasil Uji Coba Widiya Kartika Putri; Frida Ulfah Ermawati
PendIPA Journal of Science Education Vol 5, No 1 (2021): November - February
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/pendipa.5.1.92-101

Pada pembelajaran Fisika, banyak ditemukan siswa yang mengalami miskonsepsi, sebagai misal pada konsep Getaran Harmonis Sederhana (GHS). Miskonsepsi tersebut harus segera diidentifikasi menggunakan tes diagnostik, salah satunya berformat five-tier. Makalah ini melaporkan hasil pengembangan instrumen tes diagnostik five-tier untuk materi GHS, hasil uji validitas, reliabilitas dan uji coba terbatasnya kepada sejumlah siswa, mengingat instrumen semacam itu belum tersedia. Untuk itu metode research & development diadopsi. Diperoleh 16 butir soal yang siap diuji cobakan. Uji validitas meliputi validitas internal dan eksternal. Validitas internal dilakukan oleh dua orang Dosen Fisika UNESA yang ditunjuk. Validitas eksternal meliputi validitas isi dan konstruk. Validitas isi ditentukan berdasarkan % false positive (FP) dan false negative (FN) yang harus <10%. Validitas konstruk ditentukan berdasarkan korelasi Pearson Product Moment (rxy). Sedangkan reliabilitas ditentukan berdasarkan koefisien Alpha Cronbach (r11) dengan rteori= 0,413 (taraf signifikansi 5 %). Diperoleh FP=0,6 %, FN=2,4 %, rxy= 0,659 dan r11=0,869 sehingga instrumen tersebut valid dan reliabel. Uji coba terbatas menunjukkan bahwa semua siswa uji mengalami lack of knowledge terhadap konsep GHS. Temuan ini sekaligus mengkonfirmasi bahwa Fisika adalah pelajaran yang sulit bagi siswa.

Pengaruh Proses Pelapisan NiCoCrAl Terhadap Flexural Strength & Modulus Flexural Pada Baja ST-37 Rio Simatupang; Frida Ulfah Ermawati; Kemas Ahmad Zaini Thosin
Inovasi Fisika Indonesia Vol 2 No 1 (2013)
Publisher : Jurusan Fisika FMIPA Universitas Negeri Surabaya

Abstrak Telah dilakukan sintesis pelapisan lapisan NiCo dan CrAl pada baja ST-37 dengan menerapkan metode elektroplating NiCo 5% pada temperatur ± 50 °C, kemudian dilanjutkan dengan metode pack cementation pada temperatur ± 800 °C guna mendifusikan chromium (Cr) dan aluminium (Al) pada baja ST-37 sehingga diperoleh lapisan FeNiCoCrAl dengan sifat mekanik yaitu flexural strength dan modulus flexural yang lebih baik. Untuk keperluan tersebut maka uji tekuk (bending test) dilakukan terhadap 4 sampel yang berbeda, yaitu Fe-base, FeNiCo, FeNiCoCr, dan FeNiCoCrAl. Diperoleh hasil flexural strength dan modulus flexural terbesar berturut-turut sebesar 681,96 MPa dan 12.855,0 MPa yang dimiliki lapisan FeNiCo, sedangkan flexural strength terkecil sebesar 483,48 MPa yang dimiliki lapisan FeNiCoCrAl, serta modulus flexural terkecil sebesar 4.434,8 MPa yang dimiliki lapisan FeNiCoCr. Simpulan dari penelitian ini ialah dengan dilakukannya proses pelapisan NiCoCrAl pada baja ST-37 yang meliputi proses elektroplating NiCo 5% dan pack cementation Cr dan Al, maka diperoleh sifat mekanik (flexural strength dan modulus flexural) yang justru menurun bukan meningkat seperti yang diharapkan. Hal diakibatkan karena pengaruh pemanasan yang cukup tinggi pada pack cementation sehingga dapat mempengaruhi mikrostruktur dari logam dasarnya (Fe-base) menjadi semakin lunak dan tidak stabil fasenya. Kata Kunci : Elektroplating, Pack Cementation, NiCoCrAl, Flexural Strength, Modulus Flexural, Baja ST-37, Uji Tekuk (bending test). Abstract Synthesis on coating of NiCo and CrAl layer to ST-37 steel type was carried out by using electroplating and pack cementation methods. The first coating method was aimed to add NiCo layer to the surface of steel at 50 °C, while the second was addressed to diffuse CrAl layer into the FeNiCo substrate and this was carried out at 800 °C. The aim of coating is to improve mechanical properties (flexural strength and modulus flexural) of the steel. To do that, bending test was carried out to 4 different samples, namely Fe-base, FeNiCo, FeNiCoCr, and FeNiCoCrAl. The result are flexural strength and modulus flexural, respectively for the largest are 681.96 MPa and 12855.0 MPa is owned by FeNiCo layer, while the smallest flexural strength is 483.48 MPa owned by FeNiCoCrAl layer, and the smallest modulus flexural is 4434.8 MPa owned by FeNiCoCr layer. It was obtained that the thicker the NiCo coated onto the surface of the steel, then the higher the flexural strength and modulus flexural. On the other hand, the thicker the CrAl layer diffused into the FeNiCo, then the thinner the flexural strength and modulus flexural. So, by doing NiCoCrAl coating process on ST-37 steel that include electroplating NiCo 5% process and pack cementation Cr and Al can decrease the mechanical properties (flexural strength and modulus flexural) which is instead of increasing as expected. It is caused by the effect of heating is high enough so that the pack cementation can affect the microstructure of basic metals (Fe-base) become soft and unstable phase. Keywords : Electroplating, Pack Cementation, NiCoCrAl, Flexural Strength, Modulus Flexural, ST-37 Steel, Bending Test.

Co-Authors , NURITA Abror, Muhammad Dhafi Zainal Abu Zainuddin AISAHSARI, RAHAYU Akmalia, Anisa Dina Aretha Patricia Andriani AZIZAH IMAMAH, NUR Basmalah, Mazaya CHOIRUL ANNA NUR AFIFAH DHIMAS IRVAN ARDEANSYAH Durrotun Nisa’ DWI IKA YULIANTI Dzulkiflih Dzulkiflih Elga Nilawati Ermaningsih, Ernie Feby Y. Rostianbudi HADZIQUNNUHA AHFA, MUHAMMAD HANIFAH, LAILATUL IKA YULIANTI, DWI INDAH UTARI, JULI Indarniati Indarniati IRVAN ARDEANSYAH, DHIMAS ISFARA, LAILA Izza, Lailatul Kadarosman, Afandy Kemas Ahmad Zaini Thosin Lailatul Izza Lestari, Emilia Dwi Lina Zendya Maulidiya Fadilatul Latifa MENIK KURNIAWATI, DYAH MIFTAKHUL JANNAH, EMITA Mugni Muammar, Asep MUHAMMAD HADZIQUNNUHA AHFA Nabilla, Alya Putri Nanang Sudrajat, Nanang Nanda Rettiningtyas nida alifah Nila Apriliyanti Nilawati, Elga Nisrina Nur Ramadhani NOVYANTI NUR FIRDAUSI NUR AZIZAH IMAMAH NUR FIRDAUSI, NOVYANTI Putri, Veldiana Oktaviana renitafitriani-13 Rio Simatupang ROHMANASARI, FITRI SAADATUL FAJRIYYAH, NORIYATUS SAKINATUS ZAHRO Sukoco, Bagus Edi Sulaiman, Yaya Syadza Aisyah Hermadianti Syah Nanta Maulana Ishak TABAHYATI, SITI Taryana, Yana Thoifah, Thoifah Tony Seno Aji Widiya Kartika Putri Wilda Kusumaningtyas Yantidewi, Meta ZAHRO, SAKINATUS Zulfy Fardhany, Muhammad Fikri

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