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All Journal Primary: Jurnal Pendidikan Guru Sekolah Dasar Majalah Ilmiah Gema Maritim Bioscientist : Jurnal Ilmiah Biologi
Puryadi
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Education Engineering Immunology & microbiology Social Sciences Other

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Analisa Penyebab Terjadnya Kegagalan Pembakaran Awal Pada Ketel Uap Bantu Wilastari, Santhi; Puryadi
Majalah Ilmiah Gema Maritim Vol 19 No 1 (2017): Gema Maritim Vol 19 No 1 Februari 2017
Publisher : Politeknik Bumi Akpelni

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (645.514 KB) | DOI: 10.37612/gema-maritim.v19i1.34

Abstract

Injektor dan injection pump di dalam sistem mesin induk sangat berperan besar dalam mendukung proses pembakaran. Prinsip kerja dari injektor ialah mengabutkan bahan bakar dan juga menyemprotkan bahan bakar ke dalam ruang silinder untuk mendukung terjadinya pembakaran dan prinsip kerja injection pump adalah memompa bahan bakar tekanan tinggi ke injector. Dengan melihat hal diatas sangat penting peran dari tekanan kerja bahan bakar dari injection pump untuk mempermudah proses pengabutan. Di dalam pelaksanaan penelitian terdapat permasalahan yang mengganggu kinerja dari injector antara lain: terjadi penyumbatan pada nozzle, jarum macet, nozzle telah longgar dan injection pump, antara lain: plunger aus, bearing aus, delivery valve aus dan bocornya pipa tekanan tinggi. Oleh sebab itu penulis melaksanakan penelitian tentang permasalahan apa saja yang dapat mengganggu kinerja injector dan turunnya tekanan bahan bakar.
PENERAPAN STRATEGI INKUIRI BIOLOGIUNTUK MENINGKATKAN HASIL BELAJAR IPA SISWA KELAS VISD NEGERI 009 AIR EMAS Puryadi
Primary: Jurnal Pendidikan Guru Sekolah Dasar Vol. 5 No. 3 (2016): EDISI HUT PGRI KE-71
Publisher : Laboratorium Program Studi Pendidikan Guru Sekolah Dasar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33578/

Abstract

The background of this study was the low science (IPA) learning outcomes of students, as evidenced by the fact that out of 40 students, only 20 students achieved learning mastery and the average student score was 59.50. This research was conducted as a classroom action research in two cycles. The data used in this study consisted of teacher activities, student activities, and student learning outcomes. Based on the research results, it was revealed that the inquiry-based biology learning strategy could improve students’ science learning outcomes. This improvement was evidenced by: (a) increased teacher and student activities in each cycle, where teacher activity increased from 42.00% in the first meeting of cycle I to 52.00% in the second meeting of cycle I, then to 65.00% in the first meeting of cycle II, and finally to 78.00% in the second meeting of cycle II, while student activity increased from 49.00% in the first meeting of cycle I to 61.00% in the second meeting of cycle I, then to 68.00% in the first meeting of cycle II, and to 81.00% in the second meeting of cycle II; and (b) improved completeness of student learning outcomes in each cycle, where the number of students achieving mastery increased from 20 students (50.00%) in the preliminary data to 26 students (65.00%) in the first cycle and to 34 students (85.00%) in the second cycle. In addition, students’ average learning scores also improved from 59.50 in the preliminary data to 64 in the first cycle and to 68 in the second cycle.
Integrasi Metode Fitoremidiasi dan Filtrasi pada reaktor Portabel untuk Pengolahan Air Limbah Gelondongan Mengandung Merkuri di Sekitar Danau Lebo, Sumbawa Barat Rahman, Abdul; Puryadi; Ulfa, Andi Maria
Bioscientist : Jurnal Ilmiah Biologi Vol. 13 No. 4 (2025): December
Publisher : Department of Biology Education, FSTT, Mandalika University of Education, Indonesia.

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/bioscientist.v13i4.18310

Abstract

This study aims to design and test the effectiveness of a portable reactor based on filtration and phytoremediation in reducing mercury levels in gold processing wastewater. The study was conducted experimentally using a portable reactor with a water lettuce (Pistia stratiotes) phytoremediation unit and a filtration unit made of biofoam, zeolite rock, and activated carbon. Testing was carried out on contact time variations of 0–120 minutes and repeated use up to 15 times, with mercury level analysis using AAS. The results showed that the reactor was able to reduce mercury levels from 0.7095 mg/L to 0.0040–0.0039 mg/L at a contact time of 90–120 minutes with an efficiency of up to 99.45%, thus meeting the applicable quality standards. The minimum contact time for the reactor to work optimally was 90 minutes. In repeated use, the highest effectiveness occurs in the initial stage, then decreases due to saturation of the filtration media. This portable reactor is effective and has the potential to be applied directly at PETI sites as a practical alternative technology for mercury waste treatment.
Co-Authors Abdul Rahman Ulfa, Andi Maria Wilastari, Santhi