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5 results on '"Mirnawati Dewi"'

1. Pengaruh Berbagai Macam Media Tanam Terhadap Pertumbuhan Bibit Kakao (Theobroma Cacao. L)

Author

Mirnawati Dewi, La Sarido, and Rudi Rudi

Subjects
Bibit Kakao, Media Tanam, Pertumbuhan, Agriculture, Forestry, SD1-669.5
Abstract

Penelitian ini dilaksanakan selama 3 bulan mulai dari januari sampai April 2022, lokasi penelitian bertempat di desa kerayaan bual-bual kecamatan sangkulirang. Penelitian bertujuan untuk mengetahui pengaruh pemberian berbagai macam media tanam terhadap pertumbuhan bibit kakao (Theobroma cacao L). Penelitian dengan menggunakan metode rancangan acak lengkap (RAL) non factorial yang terdiri dari 5 perlakuan dan 5 kali ulangan. Adapun perlakuan terdiri dari K0= tanpa perlakuan, K1= media tanam bokasi, K2= media tanam kotoran ayam, K3= media tanam kotoran sapi dan K4= media tanam kotoran kambing. Semua hasil perlakuan tidak berpengaruh nyata terhadap tinggi tanaman, jumlah daun dan diameter batang pada umur 20 HST, 40 HST, 60 HST dan 80 HST. Adapun media tanam yang cocok untuk pertumbuhan bibit kakao adalah media tanam kotoran ayam

Published
2023
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2. Evolusi Mikrostruktur Paduan Al 6061 Hasil Proses Canai Dingin Terhadap Sifat Mekanik

Author

Ali Alhamidi, Muhammad Fitrullah, and Mirnawati Dewi

Subjects
canai, aging, fasa kedua, strain hardening, dislokasi, Technology
Abstract

Paduan Al 6061 diproses canai dengan reduksi 50%, 60% dan 70% selanjutnya di aging pada temperatur 200*C selama variasi waktu 1800, 3600, 5400, 7200 dan 10800 detik. Analisa microstruktur dan sifat mekanik dilakukan dengan optikal mikroskop dan Brinell Hardness Test (HBN). Bentuk mikrostrukutr menunjukan bahwa butiran memanjang setelah canai berubah menjadi berbentuk equaxial. Analisa XRD menunjukan hadirnya fase ke dua Mg2Si dan Al2FeSi nampak dalam peak XRD setelah canai dan aging. Hal ini nampak bahwa kekerasan meningkat dengan meningkatnya waktu aging dan menurun setelah aging selama 7200 detik. Nilai kekerasan tertinggi dicapai sebesar 121 HBN pada sampel yang direduksi 70% dan ading selama 7200 detik.Hal ini menjadi alasan bahwa kekerasan yang tinggi akibat hadirnya fraksi fase kedua setelah aging meningkat.

Published
2016
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4. Ekstrakurikuler Penggiat Sejarah Di SMA Negeri 11 Banjarmasin

Author

Herry Porda Nugroho Putro and Mirnawati Dewi

Subjects
Documentation, Local history, Mathematics education, Subject (documents), Sociology, Subject matter, Qualitative research
Abstract

This study discusses extracurricular activities for history activists at SMA Negeri 11 Banjarmasin. The limited subject matter taught in schools about local history in history subject makes students less aware of and familiar with the history of their own area. This study aims to describe the extracurricular activities of history activists at SMA Negeri 11 Banjarmasin. In this study used qualitative methods, in obtaining informations begins with interviews, observations and documentation which are used as research sources. There are two sources of data used in this study, namely primary data sources for coaches, student members of history activists, and secondary sources in the form data of data from schools. History activists extracurricular activities were formed as a place to channel the tallents of history activitiests whi focus on the introduction and knowledge of the local history of the South Kalimantan region.

Published
2021

5. MICROSTRUCTURAL AND MECHANICAL PROPERTIES AL 6061 PROCESSED BY COLD ROLLING AND AGING

Author

Ahmad Ali Alhamidi and Mirnawati Dewi

Subjects
Wear resistance, Materials science, Morphology (linguistics), Alloy, engineering, Dislocation, engineering.material, Composite material, Grain size, Hot rolled
Abstract

An Alumunium alloy 6061was produced by cold rolling and subsequently aging. Cold rolling is used for reducing grain size and aging is used for producing second-phase, thus improving hardness, strength and wear resistance. In the present paper, a process through cold rolling with reduction of 50%, 60% and 70% in thickness then aged at 200 0 C for 1.800, 3.600, 5.400, 7.200 and 10.800 sec. Microstructural analysis shows that the grain morphology consists of equaxied grain for as-received samples and elongated grain for sample after cold roll and aging. X-Ray Diffraction (XRD) analysis showed peaks phases in Al 6061 after cold rolled and aging. Hardness measurements showed that combination between small grain size and presence of second-phase led to a significant increase in the hardness. Maximum hardness of 121 HBN is achieve for sample after cold roll 70% and aged for 5400 second. The wear resistance testing showed that lost particles of 6,209951 x 10 -6 mm 3 /mm for received sample and 4,775436 x 10 -6 mm 3 /mm for sample after aging process. It is showed that high hardness related to increase the wear resistance. It is reasonable that the presence of second phases are function as obstacle for dislocation movement.

Published
2018

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