2019
DOI: 10.24843/jik.2019.v12.i02.p06
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Aplikasi Pemantauan Posisi Anak-Anak Menggunakan Smart Watch dan Database Firebase

Abstract: Keamanan anak – anak menjadi perhatian para orang tua di jaman modern ini. Kriminalitas terhadap anak- anak sering mengancam mereka, disaat pengawasan orang tua lemah. Orang tua tidak dapat memantau setiap saat aktivitas anak-anak mereka. Kesibukan orang tua untuk mendapatkan uang menyebabkan mereka terbatas dalam memantau kegiatan anak-anak, terutama anak-anak mereka yang masih duduk di taman kanak-kanak dan sekolah dasar. Orang tua memerlukan suatu alat ataupun aplikasi yang dapat membantu pemantauan posisi … Show more

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“…Fe3O4 has the characteristic black color and ferromagnetic consist of Fe 2+ and Fe 3+ ions [9]. The magnetic moment resulting from cations occupying tetrahedral and octahedral sites are identical, despite their orientation opposite [10].…”
Section: Introductionmentioning
confidence: 99%
“…Fe3O4 has the characteristic black color and ferromagnetic consist of Fe 2+ and Fe 3+ ions [9]. The magnetic moment resulting from cations occupying tetrahedral and octahedral sites are identical, despite their orientation opposite [10].…”
Section: Introductionmentioning
confidence: 99%
“…However, a notable drawback of this method is the tendency to produce a wide distribution of grain sizes among nanoparticles and their polydispersity, which can lead to easy agglomeration. To address this, surface functionalization of the nanoparticles or the incorporation of a capping agent can be employed [12]. Fe3O4 nanoparticles have recently gained the attention of many researchers because they have an efficient nanoscale system and can be used in many application [13][14] Chemical coprecipitation stands out as the most promising method for nanoperticles production due to its simplicity and the use of relatively safe chemicals.…”
Section: Introductionmentioning
confidence: 99%