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All Journal Journal of Aquatropica Asia Jurnal Rekayasa Material, Manufaktur & Energi JURNAL MathEdu (Mathematic Education Journal)
., Ramadhani
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Aerospace Engineering Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Immunology & microbiology Mathematics

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A REVIEW: FACILE AND GREEN SYNTHESIS OF MARINE MACROALGAE AND ITS PHOTOCATALYTIC PERFORMANCE ON POLLUTED WATER REMEDIATION ., Ramadhani; Said, Ahmad
Journal of Aquatropica Asia Vol 9 No 1 (2024): Journal of Aquatropica Asia
Publisher : Jurusan Akuakultur, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/joaa.v9i1.5245

Abstract

This review critically examines the burgeoning field of research focused on the environmentally benign synthesis of metallic nanoparticles exploiting the unique properties and diverse array of marine macroalgae species. Harnessing macroalgal biomolecules as reductants and stabilizers, numerous findings have discovered the biosynthesis of silver, gold, iron oxide, zinc oxide, and other nanoparticles through a sustainable "phycosynthesis" technique without toxic chemicals. Extensively characterized for their morphologies and properties, these algae-mediated nanoparticles exhibit notable photocatalytic activities in degrading various organic dyes and pollutants. Particularly, over 90% degradation efficiency has been achieved for dyes like methylene blue, methyl orange, and rhodamine B utilizing nanoparticles produced from macroalgae such as Sargassum horneri, Syringodium isoetifolium and Ulva lactuca. The mechanism is hypothesized to involve photoexcitation generating reactive oxidative species on the nanoparticle surface that rapidly cleave dye molecules. Improved understanding of the roles of macroalgal biomolecules and optimization of synthesis conditions may enable enhanced catalytic performances. With their widespread availability and biodiversity remaining largely untapped, marine macroalgae prove promising as renewable resources for developing eco-friendly water remediation technologies through metal/metal oxide nanocatalyst design.
Rancang Bangun Mesin Buah Sortir Jeruk Berdasarkan Ukuran Standart Buah Jeruk dengan Kapasitas Penyortiran 500kg/Jam Siregar, Chandra Amirsyah; Siregar, A M; Amri, Ahmad F; ., Zainal; ., Ramadhani; L, M Zulfadli
Rekayasa Material, Manufaktur dan Energi Vol 7, No 1: Januari 2024
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v7i1.18331

Abstract

North Sumatra is a province that has a fairly extensive agricultural area. One of them is orange plants in the Besitang Sekoci plantation area, Langkat Regency and Karo Regency, North Sumatra Province. So, to support the quality of oranges, a sorting machine is needed that can guarantee the standardization of orange fruit, whether grade 1, 2, 3 and 4. In this research, an orange sorting machine will be designed and built. The sorting machine is designed and made using hollow iron measuring 40mm x 40mm, for the machine stand using UNP iron measuring 100 mm x 50 mm x 5 mm, the sorting or grade tube uses 12 inch paralon pipe, for the frame cover uses plate iron. with a thickness of 1.5mm, uses a conveyor as a distributor, uses an electric motor and gearbox connected to a pulley and belt to drive the machine. Before being built, the design results were also simulated using Solidworks software to determine the strength of the frame on the machine used and to obtain strong material quality when under load. From the simulation results, it is obtained that the machine design is safe to use. The orange fruit sorting machine is capable of sorting fruit according to size standards based on SNI 3165-2009 with a capacity of 500kg/hour.
Analisis Kesalahan Siswa SMP Kelas VIII Dalam Menyelesaikan Soal Cerita Matematika Materi Statistika Di MTsS Kesuma LKMD Khadijah, Siti; Berutu, Alya Fahira; Nabillah, Sarah; Tarigan, Yuni Sartika; ., Ramadhani
JURNAL MathEdu (Mathematic Education Journal) Vol 7 No 1 (2024): JURNAL MathEdu (Mathematic Education Journal) Maret 2024
Publisher : Program Studi Pendidikan Matematika Institut Pendidikan Tapanuli Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37081/mathedu.v7i1.5723

Abstract

Penelitian ini bertujuan untuk menganalisis kesalahan dan penyebab kesalahan siswa SMP kelas VIII dalam menyelesaikan soal cerita matematika materi statistika di MTsS Kesuma LKMD. Populasi pada penelitian ini adalah kelas VIII 3 berjumlah 24 orang siswa dan sampel pada penelitian ini yaitu 3 orang siswa yang merupakan hasil dari teknik purposive sampling. Penelitian ini menggunakan metode deskriptif kualitatif. Data penelitian diperoleh melalui tes tertulis dan wawancara. Hasil penelitian menunjukkan bahwa kesalahan yang dilakukan siswa antara lain: siswa salah dalam mengubah informasi yang diberikan ke dalam ekspresi matematika, siswa salah konsep, kesalahan dalam menafsirkan penyelesaian,tidak mebuat diketahui pada langkah pertama menjawab soal, tidak membuat kesimpulan, dan terdapat kesalahan dalam perhitungan. Penyebab siswa melakukan kesalahan adalah: kurang memperhatikan soal, kurang paham terhadap suatu materi, terburu-buru, dan kurang teliti dalam melakukan perhitungan.
A REVIEW: FACILE AND GREEN SYNTHESIS OF MARINE MACROALGAE AND ITS PHOTOCATALYTIC PERFORMANCE ON POLLUTED WATER REMEDIATION ., Ramadhani; Said, Ahmad
Journal of Aquatropica Asia Vol 9 No 1 (2024): Journal of Aquatropica Asia
Publisher : Jurusan Akuakultur, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/joaa.v9i1.5245

Abstract

This review critically examines the burgeoning field of research focused on the environmentally benign synthesis of metallic nanoparticles exploiting the unique properties and diverse array of marine macroalgae species. Harnessing macroalgal biomolecules as reductants and stabilizers, numerous findings have discovered the biosynthesis of silver, gold, iron oxide, zinc oxide, and other nanoparticles through a sustainable "phycosynthesis" technique without toxic chemicals. Extensively characterized for their morphologies and properties, these algae-mediated nanoparticles exhibit notable photocatalytic activities in degrading various organic dyes and pollutants. Particularly, over 90% degradation efficiency has been achieved for dyes like methylene blue, methyl orange, and rhodamine B utilizing nanoparticles produced from macroalgae such as Sargassum horneri, Syringodium isoetifolium and Ulva lactuca. The mechanism is hypothesized to involve photoexcitation generating reactive oxidative species on the nanoparticle surface that rapidly cleave dye molecules. Improved understanding of the roles of macroalgal biomolecules and optimization of synthesis conditions may enable enhanced catalytic performances. With their widespread availability and biodiversity remaining largely untapped, marine macroalgae prove promising as renewable resources for developing eco-friendly water remediation technologies through metal/metal oxide nanocatalyst design.
ANALISIS KEMAMPUAN REPRESENTASI MATEMATIS SISWA SMK 3 AL-WASHLIYAH MEDAN PADA MATERI STATISTIKA Aurelya Nasution, Chintya Dea; Puspita Sari, Della; Aisyah, Siti; ., Ramadhani
JURNAL MathEdu (Mathematic Education Journal) Vol 6 No 1 (2023): JURNAL MathEdu (Mathematic Education Journal) Maret 2023
Publisher : Program Studi Pendidikan Matematika Institut Pendidikan Tapanuli Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37081/mathedu.v6i1.4754

Abstract

Penelitian bertujuan untuk mengetahui tingkat kemampuan representasi matematis siswa SMK pada materi statistika. Melalui penelitian ini akan dianalisis tingkat kemampuan representasi matematis siswa yang dikelompokkan secara tinggi, sedang dan rendah, serta kesalahan-kesalahan siswa dalam mengerjakan soal pada materi statistika yang berfokus pada mean, median dan modus. Subjek penelitian adalah 3 orang siswi kelas XII yang keseluruhannya terdiri dari siswa perempuan. Penelitian termasuk penelitian kualitatif. Teknik pengumpulan data menggunakan tes, dan wawancara. Hasil penelitian menunjukkan kemampuan representasi siswa SMK tergolong sedang sebesar 62%. Kesalahan siswa meliputi (1) siswa tidak teliti menyelesaikan perhitungan dengan baik (2) siswa memilih kalimat dalam menyelesaikan soal tidak logis dan lebih memilih menggunakan persamaan. (3) Jawaban siswa yang ditulis oleh siswa tidak terlihat jelas.
Co-Authors ., Zainal Ahmad Said Amri, Ahmad F Aurelya Nasution, Chintya Dea Berutu, Alya Fahira L, M Zulfadli Nabillah, Sarah Puspita Sari, Della Siregar, A M Siregar, Chandra Amirsyah Siti Aisyah Siti Khadijah Tarigan, Yuni Sartika