Fe3O4 encapsulated PEG form iron sand at wari ino beach has been successfully synthesized by co-precipitation method. The average particle size of the nanoparticle 11,3 nm was determined by scherrer formula. Fe3O4 modification PEG 4000 was successfully encapsulated the samples by the presence C-O-C and CH bonding that were characterized using Fourier Transform Infra Red (FTIR), X-Ray Diffraction (XRD) pattern shows that all samples are formed by single phase cubic spinel magnetite , and Scanning Electron Microscopy (SEM) shows the high dispersion capability while encapsulated process using PEG. The results of the characterization show that the Fe3O4 successfully encapsulated by PEG 4000.
Kurangnya pemahaman, dan penguasaan mahasiswa terhadap materi statistika serta pengoperasian software mengakibatkan minimnya penjabaran hasil analisis data. Hal tersebut tergambar pada mahasiswa semester VII dimana penyelesaian laporan Magang Kerja di wajibkan menggunakan persamaan matematika dalam memaparkan hasil magangnya. Maka fokus kegiatan ini, menitik beratkan pada cara menganalisis data menggunakan persamaan regresi sederhana baik secara manual dan penggunaan fitur data analysis yang tersedia pada microsoft excel. Luaran kegiatan dalam rekaman evaluasi, tertera pernyataan mahasiswa sebagai responden menyatakan kegiatan ini memberikan pengetahuan baru terlebih khusus penggunaan fitur data analysis. Meskipun berhasil, kegiatan ini memiliki kekurangan pada alokasi waktu kegiatan sangat terbatas. Maka pada kesempatan lain alokasi waktu menjadi perhatian.
Fenomena suatu antrian dan waktu layanan yang terjadi di direktorat keuangan Universitas Halmahera dapat dijabarkan menggunakan suatu konsep matematika mengenai distribusi peluang. Hasil penelitian menunjukan bahwa model antrian yakni secara individu. Hasil uji Poisson memperlihatkan 0,03<=0,9982 sehingga, proses antrian di direktorat keuangan universitas Halmahera berdistribusi Poisson.Sedangkan analisis waktu layanan yakni 4,606>0,352 maka, disimpulkan waktu layanan tidak berdistribusi eksponensial. Penyebab di tolaknya waktu layanan karena h1 sejak pukul 09.00‒12.00 tidak ada antrian saat layanan di kantor direktorat keuangan.
Infant Mortality Rate is a reflection of infant survival which will determine the quality of life of human resources. North Maluku Province is an archipelago province with a relatively high infant mortality rate. The still high infant mortality rate in North Maluku is influenced by several factors, apart from the low equity and affordability of health services, socio-economic factors also greatly affect infant and under-five mortality rates. North Halmahera District is one of the highest IMR contributors in North Maluku Province. This study aims to mathematically analyze the infant mortality rate in North Halmahera. The results showed that all predictor variables had an effect on infant mortality. The analysis results found the best model with three point knots with a determination coefficient of 93% and a minimum GCV value of 1.52.
Kumo, Kupa-Kupa, Pitu, and Luari beaches are tourist destinations that are always crowded with local and foreign tourists. This becomes interesting, because recently the problem of human population density in an area has become a hot topic for study. Using the polynomial method, it resulted in 6th order with R2 0.950 (Kumo), 0.868 (Kupa-Kupa), 0.799 (Pitu), and 0.399 (Luari) representing the distribution of visits. The highest levels of visits occurred in the twelfth, fifth, fourth, and sixth months, respectively. The analysis by applying the logistics function shows the highest level of visits throughout 2018 which are Kumo 283.95 tourists, Kupa-Kupa 342.12 tourists, Pitu 81.77 tourists and, Luari 1088.35 tourists. Based on the threshold analysis, the threshold value shows 255.56 tourists (Kumo), 297.08 tourists (Kupa-Kupa), 65.58 tourists (Pitu), and 836.42 tourists (Luari). The results of this study inform the level of tourist visits exceeding the threshold value in four tourist destinations. Given that the four tourist destinations carry the concept of ecology as a selling point, the manager needs to reorganize the level of tourist visits. Excess levels of tourist arrivals can have a negative impact on the comfort and sustainability of tourist destinations
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