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All Journal HAYATI Journal of Biosciences Jurnal Pendidikan Matematika dan IPA The Journal of Pure and Applied Chemistry Research SEMIRATA 2015 EduChemia: Jurnal Kimia dan Pendidikan Edukasi: Jurnal Pendidikan Jurnal Penelitian Pendidikan IPA (JPPIPA) SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan AR-RAZI Jurnal Ilmiah BULETIN AL-RIBAATH Pena Kreatif : Jurnal Pendidikan
Rizmahardian Ashari Kurniawan
Department Of Chemical Education , Faculty Of Education, Universitas Muhammadiyah Pontianak, Pontianak, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Engineering Environmental Science Health Professions Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Nursing Physics Public Health Social Sciences Other

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DESKRIPSI HASIL BELAJAR SISWA PADA MATA PELAJARAN KIMIA DITINJAU DARI GAYA BELAJAR DI SMA NEGERI 1 PONTIANAK (THE DESRIPTION OF STUDENTS’ LEARNING OUTCOMES ON CHEMISTRY OBSERVED FROM THE LEARNING STYLE AT SMA NEGERI 1 PONTIANAK) Samsuri .; Rizmahardian A. Kurniawan; Tuti Kurniati
Jurnal Buletin Al-Ribaath Vol 12, No 2 (2015): Buletin Al-Ribaath
Publisher : Universitas Muhammadiyah Pontianak

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (632.043 KB) | DOI: 10.29406/br.v12i2.81

Abstract

Penelitian ini adalah penelitian deskriptif yang secara umum bertujuan untuk mengetahui hasil belajar siswakelas X MIPA SMA Negeri 1 Pontianak pada mata pelajaran kimia ditinjau dari gaya belajar model VARK (visual, aural, write-read, kinesthetic). Siswa SMA Negeri 1 Pontianak  memiliki hasil belajar yangberfariasi serta cara dan gaya belajar yang berbeda-beda . Gaya belajar tersebut penting diketahui baik bagi guru maupun siswa.  Pengetahuan tentang gaya belajarnya dapat memberdayakan untuk mengidentifikasidan menggunakan tehnik belajar terbaik sesuai gaya belajar siswa masing-masing sehingga menghasilkankepuasan pemahaman materi yang lebih baik dan efektif.  Alat instrumen penelitian ini adalah angket gayabelajar, lembar observasi, pedoman wawancara dan lembar dokumentasi. Berdasarkan hasil analisis data,diperoleh informasi bahwa kecenderungan gaya belajar siswa didominasi oleh gaya belajar kinestetik untukgaya belajar unimodal yaitu 39,40% dan gaya belajar V-A-R-K untuk gaya belajar multimodal. Pada gayabelajar read/write terdapat kesesuaian antara cara belajar dan gaya belajar siswa, namun, hasil belajar siswapada gaya belajar read/write paling rendah dibanding dengan tipe gaya belajar yang lain yaitu 63. Siswadengan gaya belajar V-A-R-K memiliki hasil belajar yang paling tinggi yaitu 76,84, hal ini dikarenakanmereka fleksibel terhadap cara belajar dan dengan mudah beralih dari tipe ke tipe tergantung kondisipembelajaran yang diberikan.Kata Kunci: Gaya belajar model VARK, multimodal, unimodal
PEATLAND BACTERIA AS ALTERNATIVE SOURCES FOR CELLULASE (BAKTERI GAMBUT SEBAGAI SUMBER ALTERNATIF SELULASE) Rizmahardian A. Kurniawan
Jurnal Buletin Al-Ribaath Vol 12, No 1 (2015): Buletin Al-Ribaath
Publisher : Universitas Muhammadiyah Pontianak

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (513.941 KB) | DOI: 10.29406/br.v12i1.69

Abstract

Riset ini dilakukan untuk mengisolasi dan mengidentifikasi bakteri dari tanah gambut Kota Pontianak, Kalimantan Barat. Sebanyak 9 dari 18 isolat bakteri diketahui memiliki aktivitas selulolitik. Isolat aktif tersebut menunjukkan terbentuknya zona hidrolisis di sekitar koloni bakteri ketika ditumbuhkan pada media mengandung karboksimetil selulosa 1%. Tiga isolat yaitu Yersinia pseudotuberculosis RAG21, Yersinia pseudotuberculosis RAG25, dan Proteus penneri RAG31 menunjukkan rasio diameter zona hidrolisis terhadap koloni, dengan rasio sebesar 2,73±0,15, 2,61±0,15, dan 4,14±0,30 secara berturut-turut.Kata Kunci:     bakteri gambut, humat, selulase, Yersinia pseudotuberculosis, Proteus penneri
Alcohol-Diluted Deep Eutactic Solvent as the Electrolyte Kurniawan, Rizmahardian Ashari; Mukhlishin, Hamdil; Indriani, Laila
EduChemia: Jurnal Kimia dan Pendidikan Vol 9, No 2 (2024)
Publisher : Department of Chemistr Education Faculty of Teacher Training and Education Universitas Su

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30870/educhemia.v9i2.27945

Abstract

Deep eutectic solvents (DESs) are promising alternatives to traditional electrolytes in electrochemical devices because of their favorable properties, including low volatility, biodegradability, and ease of preparation. This study aimed to optimize a DES composed of choline chloride and urea by investigating the effects of molar ratios and short-chain alcohol additions on viscosity, ionic conductivity, and electrochemical stability. The DES was prepared at 80°C at four molar ratios of choline chloride to urea (1:1, 1:2, 1:3, and 1:4), with a 1:2 ratio optimal for achieving a stable, homogeneous solution. Short-chain alcohols (methanol, ethanol, 1-propanol, and 1-butanol) were added to reduce viscosity and enhance conductivity. The addition of methanol and ethanol effectively lowered the viscosity and increased the ionic conductivity because of their ability to integrate into the DES matrix and disrupt hydrogen bonding. Electrochemical analysis confirmed that the oxidative stability of DESs remained unaffected by these alcohol additions, with oxidation onset consistently at approximately 1 V. These findings demonstrate that methanol and ethanol are suitable additives for improving the performance of DESs as electrolytes in electrochemical applications, enhancing both their conductivity and stability.
Peningkatan minat belajar kimia siswa SMAN 3 Kubu melalui pembelajaran berbasis permainan Kurniawan, Rizmahardian Ashari; Sulistiani, Sindi; Nadiah, Nadiah
SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Vol 9, No 2 (2025): March
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jpmb.v9i2.29363

Abstract

AbstrakSMAN 3 Kubu merupakan sekolah di Kecamatan Kubu, Kabupaten Kubu Raya, yang telah meraih akreditasi B pada tahun 2018. Namun, sekolah ini menghadapi tantangan dalam meningkatkan minat dan hasil belajar kimia siswa, akibat persepsi kimia sebagai mata pelajaran sulit dan keterbatasan fasilitas laboratorium. Untuk mengatasi hal ini, kegiatan pengabdian ini bertujuan meningkatkan minat belajar kimia melalui pembelajaran berbasis permainan yang interaktif dan berpusat pada siswa sesuai kurikulum merdeka. Kegiatan pengabdian dilakukan meliputi pendataan permainan kimia dari literatur, penyusunan katalog, pembuatan media permainan, dan pelaksanaan pembelajaran berbasis permainan di kelas. Kegiatan pembelajaran berlangsung pada 22 April 2024 dari pukul 09.55 hingga 11.55 WIB, melibatkan 22 siswa dan 1 guru kimia. Permainan seperti congklak modifikasi untuk konfigurasi elektron serta permainan papan dan kartu kimia digunakan untuk menciptakan suasana belajar yang menyenangkan. Hasil kegiatan menunjukkan bahwa katalog permainan kimia berhasil disusun dan media pembelajaran diuji coba di kelas, meningkatkan antusiasme serta pemahaman siswa terhadap konsep kimia abstrak. Observasi yang dilakukan pada saat pembelajaran menunjukkan adanya interaksi antara siswa dan guru juga meningkat. Dengan pendekatan inovatif ini, pengabdian ini memberikan kontribusi nyata terhadap pembelajaran kimia yang inovatif dan menyenangkan  di SMAN 3 Kubu. Kata kunci: kimia; pengabdian; pembelajaran; permainan; SMA. AbstractSMAN 3 Kubu, located in Kubu District, Kubu Raya Regency, achieved B accreditation in 2018. However, the school faces challenges in increasing students' interest and performance in chemistry due to its perception as a difficult subject and limited laboratory facilities. To address these issues, this community engagement program aimed to enhance students' interest in chemistry through interactive, student-centered game-based learning aligned with the Merdeka curriculum. The program involved identifying chemistry games from literature, compiling a catalog, developing game-based learning media, and implementing these games in the classroom. The instructional session was conducted on 22 April 2024, spanning 09:55 to 11:55 WIB, with participation from 22 students and one educator. Games such as modified congklak for electron configuration and chemistry-themed board and card games were used to create an engaging learning environment. The results demonstrated the successful compilation of a chemistry game catalog and the development of learning media, which were trialed in classrooms, significantly increasing students' enthusiasm and understanding of abstract chemistry concepts. Evaluation indicated improvements in students' average scores and enhanced interactions between students and teachers. This innovative approach provided a tangible contribution to fostering engaging and effective chemistry learning at SMAN 3 Kubu. Keywords: chemistry; community service; games; high school; learning.
Anti-glucosidase Activity and Antioxidant Capacity of Premna serratifolia from Sintang, Kapuas Hulu, and Sambas District, West Kalimantan, Indonesia Hadiarti, Dini; Sunandar, Ari; Cipta, Indra; Kurniawan, Rizmahardian Ashari
HAYATI Journal of Biosciences Vol. 33 No. 1 (2026): January 2026
Publisher : Bogor Agricultural University, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.4308/hjb.33.1.153-166

Abstract

The secondary metabolites in plants such as Premna serratifolia (P. serratifolia) are influenced by their growing locations, which in turn affects their bioactivity. This study aimed to compare the antioxidant activity and α-glucosidase inhibition of P. serratifolia leaf extracts from the Sintang, Kapuas Hulu, and Sambas districts in West Kalimantan. Antioxidant capacity was evaluated using the DPPH method, while the reduction of α-glucosidase activity was assessed using the PNPG method. Functional groups and active compounds were identified using FTIR and UHPLC-Q-Orbitrap HRMS. The findings indicated that the extract from Kapuas Hulu, obtained through maceration (KHM), exhibited the highest antioxidant activity (IC₅₀ 18.39) and contained the most total phenolic content (TPC). The best α-glucosidase inhibition activity (IC₅₀ 4194.14) was found in the extract from Sambas obtained through Soxhlet extraction (SSI), which had the highest total flavonoid content (TFC). Principal Component Analysis (PCA) revealed that the functional groups and active compounds of P. serratifolia from Kapuas Hulu and Sintang were similar, as both regions are located in eastern West Kalimantan. Additionally, Partial Least Squares (PLS) analysis revealed that the C-H alkane, O-H, and isoferulic acid were the most influential compounds in determining antioxidant activity. At the same time, the C=O group and NP-000308 predominantly influenced α-glucosidase inhibition.
Understanding Indonesian Vocational High School Students’ Process of Learning: A Case Study on Chemical Analysis Vocational High School in Pontianak Yulistiani, Ribka; Kurniawan, Rizmahardian Ashari; Kurniati, Tuti; Mukhlishin, Hamdil
PENA KREATIF : JURNAL PENDIDIKAN Vol 13 No 1 (2024): Pena Kreatif : Jurnal Pendidikan
Publisher : FKIP UM Pontianak

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29406/jpk.v13i1.6948

Abstract

This research is a descriptive study that generally aims to analyze the results of chemistry learning in the acid-base subject of class XI 4 students at SMKN 4 Pontianak in terms of their learning styles. Students at SMKN 4 Pontianak have varied learning outcomes and different learning methods and styles. Learning styles are very important to know for both teachers and students of class XI APL SMKN 4 Pontianak. With knowledge of learning styles, we can identify and use learning methods that best suit each student's learning preferences. This can result in a better and more effective understanding of the material, as well as increasing satisfaction in the learning process. The instruments for this research are a learning style questionnaire, interview guide. Based on the results of data analysis, information was obtained that the tendency for student learning styles to be dominated by the kinesthetic learning style for unimodal learning styles was 56.25% and the K-V learning style for multimodal learning styles was 18.75%. The students' learning outcomes on the acid-base material taught by the teacher show the following daily average scores: acid-base titration 70.3, Mohr titration 73.9, and redox titration 76.4.
Development of Natural Acid-Base Indicators Based on Biocellulose in Grade XI Science at MAN 1 Kubu Raya Fitriani, Melda; Kurniati, Tuti; Kurniawan, Rizmahardian Ashari; Mukhlishin, Hamdil
PENA KREATIF : JURNAL PENDIDIKAN Vol 13 No 1 (2024): Pena Kreatif : Jurnal Pendidikan
Publisher : FKIP UM Pontianak

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29406/jpk.v13i1.6972

Abstract

The learning of chemistry requires practical activities to assist students in understanding chemical concepts deeply and also to connect scientific principles with everyday life. However, practical activities often face challenges such as inadequate equipment and materials in laboratories, posing a challenge for educators to conduct practical-based learning. This article proposes the development of natural pH indicators based on bacterial cellulose to enhance acid-base learning in schools. These natural pH indicators are formulated by combining plant-based natural indicators with (Biocellulose) and immersing them in buffer solutions ranging from pH 1 to 14. The color changes produced by these natural pH indicators based on bacterial cellulose indicate different pH levels, serving as a reference for each solution measurement.These indicators are used in classroom learning during acid-base topics in the 11th-grade science classes. Stimulates curiosity and interest among teachers and students, leading to more engaged observations during the experiments.Overall, teachers and students perceive these natural pH indicators based on bacterial cellulose as effective tools for conveying acid-base concepts and enhancing engagement in practical-based learning methods.
Development of Student Handbook on the Extraction of Secondary Metabolites Based on Premna serratifolia Research Auliany, Shella; Hadiarti, Dini; Kurniawan, Rizmahardian Ashari
Jurnal Penelitian Pendidikan IPA Vol 10 No 9 (2024): September
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v10i9.8189

Abstract

This study aims to develop a digital module on the extraction of secondary metabolites based on P. serratifolia research as a self-study resource for students. This study utilized the Thiagarajan 4D development model, which encompasses the stages of definition, design, and development without dissemination. Participants in the study comprised students from Universitas Muhammadiyah Pontianak, Akademi Farmasi Yarsi Pontianak, and Universitas Tanjungpura who had previously studied extraction materials. Subject matter, media, and language experts provided validity scores of 94.69%, 88%, and 84.37%, respectively, resulting in an average validity score of 89.02%, categorizing the student handbook as highly valid. Small and large group trials yielded practicality percentages of 93.81% and 93.69%, respectively, with an average score of 93.75%, indicating the student handbook high practicality. Consequently, the student handbook on secondary metabolite extraction based on P. serratifolia research is deemed highly valid and practical as a self-study resource on the topic.
Boosting Critical Thinking with STEM-Based Nanolearning in Reaction Rate Studies Baihaqie, Arya Girald; Kurniasih, Dedeh; Kurniawan, Rizmahardian A.; Nufus, Zahratun
Jurnal Penelitian Pendidikan IPA Vol 10 No 8 (2024): August
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v10i8.8303

Abstract

This study aims to determine the effect of STEM-based Nanolearning implementation in improving students' critical thinking skills at SMAIT Al-Fityan Kubu Raya. This study used a one-group pre-test-post-test quasi-experimental research design. The population in this study consisted of 59 people. The sample selection for this study was carried out using purposive sampling, specifically targeting 19 students from class XI Ikhwan at SMA IT Al-Fityan Kubu Raya. The data collection technique used was a critical thinking skills test, which includes four indicators: interpretation, evaluation, analysis, and explanation. The results of the pretest research obtained at 35.53 were categorized as low and the posttest obtained at 82.89. Data analysis was conducted using normality test pretest sig 0.062 and posttest 0.070 normally distributed, hypothesis test obtained sig 0.00 <0.05, H1 accepted, and effectiveness test resulted in N-gain value of 0.75. This shows that Nanolearning has a significant effect on critical thinking skills of class XI Ikhwan SMA IT Al - Fityan Kubu Raya.
Co-Authors . Supiawati . Winarni Astuti Astuti Aulani Aulanni&#039;am Auliany, Shella Baihaqie, Arya Girald Cawang Cawang Chairunisa Zakiyatun Cipta, Indra Dedeh Kurniasih Dedeh Kurniasih Della Indika Juniarni Dini Hadiarti Eka Kurniawati Elin B. Somantri Erjayantri Nurul Rizki Fa-Kuen Shieh Fadhilah, Raudhatul Fatmawati Fatmawati Fhany Maulika Fitriani, Melda Hamdil Mukhlishin Hilda Weny Jayanti Indriani, Laila Lesi Weni Sari Linlin Suryadi Margarita M. Icha Mawardi Mawardi Mawardi Mawardi Nadiah Nadiah Ningsih Fatmawati Nufus, Zahratun Nur Achmad Nurul Fitri Ozi Auliza Peter Po-Jhen Chu Rachma Daniyati Rani Aprianti Retno Anjar Kusuma Ria Tri Wulandari Ririn Arista Rody Putra Sartika Rusninawiyah Rusninawiyah Safitri, Selviana Sahara Sahara Samsuri . Selviana Safitri Sulistiani, Sindi Sunandar, Ari Tika Pratiwi Tuti Kurniati Tuti Kurniati Yulistiani, Ribka