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All Journal Sodality: Jurnal Sosiologi Pedesaan International Journal of Renewable Energy Development Jurnal Riset Kimia Jurnal Ilmiah Pendidikan Fisika ALCHEMY Jurnal Penelitian Kimia Edulingua: Jurnal Linguistiks Terapan dan Pendidikan Bahasa Inggris JPPS (Jurnal Penelitian Pendidikan Sains) Jurnal Suluh Pendidikan SEMAR Renjana Pendidikan Dasar International Journal of Science and Society (IJSOC) POLICY, LAW, NOTARY AND REGULATORY ISSUES (POLRI) Makara Journal of Science Jurnal Natural Jurnal MIPA dan Pembelajarannya Molekul: Jurnal Ilmiah Kimia Prosiding Temu Ilmiah Nasional Guru International Journal of Renewable Energy Development Muara: Jurnal Manajemen Pelayaran Nasional Jurnal Rekayasa Proses
Fitria Rahmawati
Research Group of Solid State Chemistry & Catalysis, Chemistry Department, Sebelas Maret University, Jl. Ir. Sutami 36 A Kentingan, Surakarta
Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Neuroscience Physics Social Sciences Other

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REACTION KINETICS OF Cu ELECTRO-DEPOSITION ON THE SURFACE OF TiO2/GRAPHITE Rahmawati, Fitria; Mawasthi, Wanodya Anggit; -, Patiha
Jurnal Riset Kimia Vol 8, No 2 (2015): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v8i2.228

Abstract

Research on the kinetics of electrode reaction during copper electro-deposition on the surface of TiO2/graphite has been conducted. The aims of this research are to determine the ratio of anodic reaction rate to cathodic reaction rate , the ratio of anodic rate constant to cathodic rate constant , the equilibrium constant when the reaction reach equilibrium condition and to study the polarization in the electro-deposition reaction. Copper was deposited electrochemically from CuSO4 solution at various concentration i.e. 0.1 M; 0.2 M; 0.3 M; 0.4 M; 0.5 M. In every 5 minutes during electro-deposition process, the pH changes in anode cell was recorded and the change of Cu2+ concentration was also analyzed by spectrophotometric method. The result shows that the reaction order of Cu2+ reduction is first order and the oxidation of H2O in anodic cell is zero order. The ratio of anodic rate constant to cathodic rate constant, is 4.589´10-3 ± 0.071´10‑3. It indicates that the reaction rate  in cathode is larger than the reaction rate in anode and it allowed polarization.  The electrochemical cell reached equilibrium after 25 minutes with the equilibrium constant is 8.188´10-10 ± 1.628´10-10.
PENGEMBANGAN PERANGKAT PEMBELAJARAN FISIKA MODEL INKUIRI TERBIMBING BERBANTUAN VIDEOSCRIBE PADA MATERI KALOR UNTUK MENINGKATKAN HASIL BELAJAR SISWA SMAN 1 KEDUNGWARU Rahmawati, Fitria; W.W, Soegimin; Kardi, Soeparman
JPPS (Jurnal Penelitian Pendidikan Sains) Vol 5, No 2 (2016)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpps.v5n2.p1039-1047

Abstract

The aim of this research is to develop physics learning material based on guided inquiry model completed video scribe at heat material to improve senior high school achievement. Development of Physics Learning Material is used Dick and Carey model, this research using one-group pretest-posttest design. Data were analyzed using descriptive analysis qualitatively and quantitatively. Validation results showed that learning material is feasible to be implemented, including: (a) lesson plan; (b) student worksheet; (c) student books; (d) evaluation instrument. The results of this research were analyzed and obtained: lesson plan was properly implemented, good student responses, all students interested in learning. Learning evaluation of knowledge, N-gain include knowledge aspect and critical thinking skills, showed high improvement. Concluded that, physics learning materials developed is feasible to implemented and it can improve the student achievement Penelitian ini bertujuan mengembangkan perangkat pembelajaran fisika berbasis model inkuiri terbimbing berbantuan videoscribe yang layak untuk meningkatkan hasil belajar siswa SMA pada materi kalor. Pengembangan perangkat pembelajaran menggunakan model Dick and Carey, perangkat pembelajaran diujicobakan pada sekelompok subjek dengan rancangan one group pretest-posttest design. Data yang diperoleh dianalisis secara deskriptif kuantitatif dan kualitatif. Hasil validasi perangkat pembelajaran menunjukkan perangkat pembelajaran layak untuk diimplementasikan, meliputi: (a) RPP; (b) LKS; (c) Buku Ajar; (d) Media videoscribe; dan (e) Tes Hasil Belajar. RPP terlaksana dengan baik, dan siswa memberikan respon positif terhadap pembelajaran. N-Gain pada aspek pengetahuan dan keterampilan berpikir kritis menunjukkan peningkatan dengan kategori tinggi. Kesimpulan dari penelitian ini yakni perangkat pembelajaran yang dikembangkan layak diimplementasikan dan dapat meningkatkan hasil belajar siswa.
PENGEMBANGAN PERANGKAT PEMBELAJARAN FISIKA MODEL INKUIRI TERBIMBING BERBANTUAN VIDEOSCRIBE PADA MATERI KALOR UNTUK MENINGKATKAN HASIL BELAJAR SISWA SMAN 1 KEDUNGWARU Rahmawati, Fitria; W.W, Soegimin; Kardi, Soeparman
JPPS (Jurnal Penelitian Pendidikan Sains) Vol 5, No 2 (2016)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpps.v5n2.p1039-1047

Abstract

The aim of this research is to develop physics learning material based on guided inquiry model completed video scribe at heat material to improve senior high school achievement. Development of Physics Learning Material is used Dick and Carey model, this research using one-group pretest-posttest design. Data were analyzed using descriptive analysis qualitatively and quantitatively. Validation results showed that learning material is feasible to be implemented, including: (a) lesson plan; (b) student worksheet; (c) student books; (d) evaluation instrument. The results of this research were analyzed and obtained: lesson plan was properly implemented, good student responses, all students interested in learning. Learning evaluation of knowledge, N-gain include knowledge aspect and critical thinking skills, showed high improvement. Concluded that, physics learning materials developed is feasible to implemented and it can improve the student achievement Penelitian ini bertujuan mengembangkan perangkat pembelajaran fisika berbasis model inkuiri terbimbing berbantuan videoscribe yang layak untuk meningkatkan hasil belajar siswa SMA pada materi kalor. Pengembangan perangkat pembelajaran menggunakan model Dick and Carey, perangkat pembelajaran diujicobakan pada sekelompok subjek dengan rancangan one group pretest-posttest design. Data yang diperoleh dianalisis secara deskriptif kuantitatif dan kualitatif. Hasil validasi perangkat pembelajaran menunjukkan perangkat pembelajaran layak untuk diimplementasikan, meliputi: (a) RPP; (b) LKS; (c) Buku Ajar; (d) Media videoscribe; dan (e) Tes Hasil Belajar. RPP terlaksana dengan baik, dan siswa memberikan respon positif terhadap pembelajaran. N-Gain pada aspek pengetahuan dan keterampilan berpikir kritis menunjukkan peningkatan dengan kategori tinggi. Kesimpulan dari penelitian ini yakni perangkat pembelajaran yang dikembangkan layak diimplementasikan dan dapat meningkatkan hasil belajar siswa.
Peramalan jumlah wisatawan mancanegara ke indonesia dengan menggunakan metode autoregressive integrated moving average with exogenous variable (ARIMAX) efek variasi kalender libur akhir tahun Rahmawati, Fitria; Lestari, Trianingsih Eni
Jurnal MIPA dan Pembelajarannya Vol. 2 No. 11 (2022): Nopember
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um067v2i112022p8

Abstract

Sektor pariwisata di Indonesia merupakan salah satu andalan untuk menyerap devisa Negara. Salah satunya dari wisatawan mancanegara yang berkunjung ke Indonesia, dimana biasanya meningkat pada libur akhir tahun. Besarnya potensi ini membuat para investor asing berlomba-lomba menanamkan modal untuk membangun hotel yang dapat berakibat over supply. Untuk menangani hal tersebut diperlukan prediksi jumlah wisatawan yang akurat dengan melakukan peramalan yaitu dengan analisis deret waktu. Ketika data deret waktu memiliki variabel lebih dari satu yang disebut juga sebagai data multivariat misalkan dengan adanya penambahan variabel dummy efek variasi kalender libur akhir tahun maka salah satu metode peramalan yang bisa digunakan adalah dengan Autoregressive Integrated Moving Average with Exogenous Variable (ARIMAX) Efek Variasi Kalender. Metode ARIMAX adalah modifikasi dari model ARIMA Seasonal dengan penambahan variabel eksogen yaitu variabel dummy dan periode waktu.Dengan melihat permasalahan tersebut, penelitian ini bertujuan mengetahui model deret waktu terbaik untuk meramalkan jumlah wisatawan mancanegara dengan metode ARIMAX serta mengetahui hasil peramalan jumlah wisatawan mancanegara dengan metode ARIMAX. Berdasarkan hasil analisis terhadap jumlah wisatawan mancanegara, diperoleh bahwa model terbaik peramalan sebagai berikut Y_t=475158,2+98619,9D_1t+3650,5t+a_t 〖(1- 0,22055B)〗^(-1) 〖(1-0,48107B^12)〗^(-1) Dari model diatas diketahui bahwa peramalan untuk data ke-t dipengaruhi oleh efek variasi kalender libur akhir tahun dan periode waktu pada saat ke-t. Dan hasil peramalan jumlah wisatawan yang datang ke Indonesia dengan metode ARIMAX pada bulan Januari 2016 dan bulan februari 2016 sebesar 814052,96 dan 858423,27 orang.
Screen printed carbon electrode from coconut shell char for lead ions detection Heliani, Kinkind Raras; Rahmawati, Fitria; Wijayanta, Agung Tri
International Journal of Renewable Energy Development Vol 13, No 1 (2024): January 2024
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.2024.57679

Abstract

This research aimed to produce a screen-printed carbon electrode (SPCE) from an activated coconut shell carbon. As a raw material, coconut shell char provides renewability and is abundantly available in the market. Meanwhile, SPCE offers a simple electroanalytical electrode because the working, counter, and reference electrodes are in one piece. The coconut shell carbon was activated by steam at 700 oC for 1h, producing AC700 that was then characterized to ensure the result by following per under carbon as the main component, the phases, crystal structure, surface area, morphology, and elemental content. The result showed that the surface area of AC700 is 816 m2/g, and the surface structure is porous, as identified by SEM images. Impedance analysis followed by data fitting and conductivity calculation found a high conductivity of 8.68 x 10-2 Scm‑1. The produced-SPCE or SPAC700 was modified by ferrocene at various compositions of 10%; 20%; and 30% of mass. The SPAC700-Fc30 provided the best performance for lead analysis with a detection limit of 0.35 mM, a quantitation limit of 1.17 mM, and good reproducibility with a Repeatability Coefficient (RC) of 0.022. SPAC700-Fc30 showed good lead ions detection despite under 10% Cu2+ and 10% Co2+ interferences. The result confirmed the potential use of coconut shell char as the raw material for SPCE production.
Kinetics Study on Thermal Degradation of Polystyrene and Sulfonated Polystyrene from Styrofoam Waste Pramono, Edi; Dewi, Chintya; Rahmawati, Fitria
Molekul Vol 18 No 3 (2023)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jm.2023.18.3.7306

Abstract

This research studied kinetics of thermal degradation of polystyrene (PS), and sulfonated polustyrene (sPS) which were synthesized from styrofoam waste. The thermal study was conducted by thermogravimetric analysis (TGA) at various heating rate of 10, 15, 20 and 25 dpm. The kinetics parameters were determined by Coats Redfern (CR), Friedman (FM), Kissinger-Akahira-Sunose (KAS) and Ozawa-Flynn-Wall (OFW) models. TGA result found that PS has range thermal stability of 274 – 415 oC, but sPS has range thermal stability of 175 – 582 oC. Kinetic study to PS shows that the activation energy increases by the increasing of fraction conversion for all kinetics parameters with a regression value close to 1. While in sPS, the CR method shows an increase in activation energy value with an increasing fraction convertion. On the other hand, CR-FM-KAS and OFM methods obtained an increase in activation energy, then decreased at the fraction convertion above 0.6, and received negative activation energy. The kinetics model successfully explains the degradation of PS and sPS. In addition, the high thermal stability of sPS from styrofoam waste shows that this material has good potential as polymer electrolyte materials.
The Role of The Ni/HZSM-5 Ratio on The Anisole Hydrodeoxygenation Reaction Nugrahaningtyas, Khoirina Dwi; Nurcahyo, I F; Hidayat, Yuniawan; Rahmawati, Fitria; Fadlulloh, Zaki; Heraldy, Eddy; Qurrotul'aini, Nisriina 'Abidah
Molekul Vol 19 No 2 (2024)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jm.2024.19.2.11105

Abstract

ABSTRACT. Bio-oil is a renewable energy source with high oxygen levels, and anisole is a chemical widely employed in research to represent it. Catalytic hydrodeoxygenation (HDO) reduces the oxygen content. A catalyst known as nickel-modified HZSM-5 has shown promising results for HDO. Meanwhile, catalyst efficiency depends on the Ni/HZSM-5 ratio. So, this study aims to determine how the Ni/HZSM-5 ratio influences the catalyst's properties, activity, and selectivity in anisole HDO. The Ni/HZSM-5 catalyst was made using the wet impregnation method with various ratios of Ni/HZSM-5. The catalysts were analyzed for their morphology using scanning electron microscopy-energy-dispersive X-ray (SEM-EDX). The diffraction patterns were studied using X-ray diffraction (XRD). Surface area and porosity were determined through gas sorption analysis (GSA). Then, the acidity strength was evaluated via temperature-programmed ammonia desorption (NH3-TPD). The characterization results show Ni was successfully impregnated and distributed evenly in HZSM-5 without changing the primary structure. Adding Ni metal to HZSM-5 increases the surface area of the catalyst but reduces its acid strength. The catalytic performance of the catalysts was then evaluated in a flow reactor at 400 °C, using 15 mL/min H2 gas. The liquid products of the reaction were analyzed using gas chromatography-mass spectroscopy (GC-MS). The results of the catalytic performance show that Ni4.5/HZSM-5 has the highest catalytic activity in anisole conversion. At the same time, Ni6.4/HZSM-5 shows the highest selectivity towards benzene-toluene-xylene (BTX). Keywords: Hydrodeoxygenation, nickel, anisole, heterogeneous catalyst, acidity.
PEMANFAATAN VIDEO PEMBELAJARAN PADA MATERI POKOK SUHU, KALOR, DAN PEMUAIAN DI SMP DARUL MUTA’ALLIMIN SIDOARJO Rahmawati, Fitria; Widiasih
Prosiding Temu Ilmiah Nasional Guru Vol. 15 No. 1 (2023): TING XV 2023
Publisher : Fakultas Keguruan dan Ilmu Pendidikan (FKIP), Universitas Terbuka

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

Abstract

The emergence of various interesting videos when accessing the internet, makes students more comfortable watching videos compared to opening textbooks. On the other hand, the science learning outcomes of grade VII A students of Darul Muta'allimin Junior High School were found that only 10.34% of students were able to achieve KKM (>75). The study aims to implement the assignment of heat material without using paper (paperless) but using video media which is expected to increase student activity and learning outcomes of grade VII A students at SMP Darul Muta'allimin for the 2022/2023 school year. The research method used is classroom action research in the form of pre-cycle activities and carried out in 2 cycles with student activity observation instruments and student learning outcomes evaluation sheets. Analysis of the average learning outcomes of grade VII A students has increased significantly, from 54.14 to 78.96. The percentage of class learning completeness reached 79.31%. The number of students completed is 23 students. Students show readiness and activeness in participating in learning activities after getting video assignments. There are 6 students who have not been able to complete their learning influenced by several factors, namely internal factors (interests, talents, motivation, learning methods, psychological aspects) and external factors (social environment, friendships, and family). The results showed that giving video assignments was able to improve student learning outcomes on temperature, heat, and expansion material at SMP Darul Muta'allimin.
A dry cold sintering to Ta doped-lithium lanthanum zirconate solid electrolyte for all-solid-state lithium metal battery Rahmawati, Fitria; Alaih, Imam Shofid; Rosalin, Azka W; Nurcahyo, I F; Nursukatmo, Hartoto; Nilasary, Hanida; Oktaviano, Haryo S.; Raihan, Edo; Muzayanha, Soraya U.; Handaka, Muhammad F. A.
International Journal of Renewable Energy Development Vol 13, No 5 (2024): September 2024
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2024.60351

Abstract

Solid electrolyte is the essential part in all-solid-state battery (ASSB), in which the sintering step is vital to get a dense and high ionic conductivity. However, Li-loss frequently occurs at a high temperature, causing ionic conductivity to drop. This research investigated a dry-cold sintering process (dry-CSP) to Ta doped-LLZO (LLZTO), in which the LLZTO powder was pressed by cold isostatic pressing (CIP) at 40 MPa without solvent addition and then heated at 300oC for 2h. XRD analysis found that LLZTO300C40P remains crystallized in a single cubic with ionic conductivity of (3.02 0.53) x 10-5 Scm-1, which is higher than another result in Al doped-LLZO by CSP uniaxial pressing and with moistened-solvent (wet-CSP). The feasibility was tested by preparing a coin cell with a LiCoO2 cathode and Li metal anode. Cyclic voltammogram of the LCO-LLZTO300C40P-Li ASSB provides a high current density representing a higher electrochemical reaction rate inside the full cell. The battery ran well with an initial charging capacity of 88 mAh/g, and a discharge capacity of 50 mAh/g, providing 56.8 % Coulombic Efficiency. An interface engineering between electrode-solid electrolyte is essential to develop the ASSB performance.
The Influencing Factors of Access and Control Men and Women in Community Forest Resources Management Rahmawati, Fitria; Abdulkadir-Sunito, Melani
Sodality: Jurnal Sosiologi Pedesaan Vol. 1 No. 3 (2013): Sodality: Jurnal Sosiologi Pedesaan
Publisher : Departement of Communication and Community Development Sciences, Faculty of Human Ecology

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (307.805 KB) | DOI: 10.22500/sodality.v1i3.9404

Abstract

Tujuan penelitian ini yaitu mendeskripsikan  profil aktivitas laki-laki dan perempuan pada kegiatan reproduktif, produktif dan sosial kemasyarakatan, mendeskripsikan profil akses dan kontrol laki-laki dan perempuan dalam pengelolaan sumberdaya hutan rakyat, membandingkan faktor-faktor yang berpengaruh terhadap akses dan kontrol laki-laki dan perempuan dalam pengelolaan sumberdaya hutan rakyat. Responden adalah petani rumah tangga dan buruh tani yang bekerja di hutan rakyat. Penelitian ini mengindikasikan bahwa dalam  kegiatan reproduktif, perempuan pada rumahtangga buruh tani memiliki curahan waktu lebih tinggi daripada perempuan pada rumah tangga petani dan dalam kegiata produktif laki-laki pada rumahtangga buruh tani memiliki curahan waktu lebih tinggi daripada laki-laki pada rumahtangga petani. Faktor penguasaan lahan rumahtangga,  keikutsertaan suami-istri dalam kegiatan kelompok dan pengetahuan lokal suami istri dalam budidaya tanaman di lahan hutan mempengaruhi akses kontrol pada rumahtangga petani terlebih pada laki-laki sedangkan pada rumahtangga buruh tani faktor-faktor tersebut tidak mempengaruhi akses dan kontrol atas sumberdaya dalam kegiatan pengelolaan hutan rakyat.  Kata kunci : akses dan kontrol, pengelolaan hutan rakyat, rumahtangga buruh tani, rumahtangga petani, gender, laki-laki dan perempuan.
Co-Authors -, Patiha Abu Masykur Agustin Widyowati Alaih, Imam Shofid Albertus Sentot Sudarwanto, Albertus Sentot Arianti, Yuanita Aryanthi, G. Ayu Aulia, Nabila Putri Bagus Swandito, Paulus Bintang Junita Siagian, Bintang Junita Byba Melda Suhita Cahyani, Aliya Noor Chanif Mahdi Chintya Dewi, Chintya Dwi Nugrahaningtyas, Khoirina Eddy Heraldy Edi Pramono Fadlulloh, Zaki Handaka, Muhammad F. A. Heliani, Kinkind Raras I F Nurcahyo, I F Indah Rizki Fitriani, Indah Rizki Istiqomah, Ana Ulfa Ivandini Tribidasari Anggraningrum Kardi, Soeparman Khoirina Dwi Nugrahaningtyas Lego Karjoko Mahsus, Mahsus Maisaroh, Ummi Mawasthi, Wanodya Anggit Mohamad Syafri Muzayanha, Soraya U. N Ita Aryunani, N Ita Nilasary, Hanida Nugraheni, Putranty Widha Nur Aini NUR FADILAH Nurcahyo, I. F. Nurcahyo, I.F. Nursukatmo, Hartoto Oktaviano, Haryo S. Paramartha, I Gusti Ayu Filia Pranoto . Puspitasari, Noviana Putri, Denis Octareta Amelia Qurrotul'aini, Nisriina 'Abidah Raihan, Edo Ridwan, Qanita Rizki Nur Analita Rochmi I. Apriyani, Rochmi I. Rosalin, Azka W Saputri, Dini Deviana Sentot B. Rahardjo, Sentot B. Shobikah, Nanik Sofia, Iva Trianingsih Eni Lestari Utama Alan Deta W.W, Soegimin Widiasih Wijayanta, Agung Tri Wirawan Fadly Yuni, Prima Novia Yuniawan Hidayat Zalfa, Syafira Nur Zalukhu, Atalisi