This work aimed at controlling the size of chitosan nanoparticles that were prepared by the ionotropic gelation method. Quantities of chitosan and sodium tripolyphosphate (STPP) were optimized to obtain a fine size and narrow size distribution of the nanoparticles. X-ray diffraction and selected area electron diffraction patterns indicated the existence of both crystalline and amorphous phases of chitosan. Particle size and size distribution were determined using transmission electron microscopy and dynamic laser scattering techniques. The size of the chitosan particles decreased with a reduction in STPP content due to a decrease in cross-link bonding and the formation of aggregate particles. Using this facile approach, the finest particles of chitosan were obtained in a range of 3-6 nm.
Perguruan Tinggi memainkan peranan penting didalam mencetak sumber daya manusia (SDM) yang berkualitas. Bertolak dari peran strategisnya itu sejumlah Perguruan Tinggi seakan berlomba untuk berbenah diri agar didalam menjalankan peranannya itu berjalan sebagaimana diharapkan. Eksistensi Perguruan Tinggi khususnya yang dikelola pihak swasta sangat tergantung dengan jumlah mahasiswa yang memilih untuk kuliah di suatu perguruan tinggi. Dewasa ini sejumlah Perguruan Tinggi terlihat antusias berupaya agar menjadi pilihan calon mahasiswa baru. Motivasi, persepsi dan promosi adalah diantara faktor-faktor penting yang dapat mempengaruhi calon mahasiswa untuk memilih suatu Perguruan Tinggi. Penelitian ini dilakukan untuk mengetahui pengaruh motivasi, persepsi, promosi terhadap keputusan mahasiswa memilih STIE Pasaman- Simpang Empat. Pengumpulan data dilakukan dengan kuesioner yang memuat instrument pengukuran variabel penelitian yang dikuantifisir dengan skala Likert. Tehnik analisa data dengan pengujian melalui uji regresi linier berganda. Populasi adalah mahasiswa program studi manajemen pada semester ganjil tahun akademik 2013/2014 yang berjumlah 647 orang. Penarikan sampel dengan rumus Slovin diperoleh sampel sebanyak 248 orang. Hasil penelitian menemukan bahwa motivasi, persepsi dan promosi masing-masing secara parsial berpengaruh positif dan signifikan terhadap keputusan mahasis didalam memilih berkuliah di STIE Pasaman Simpang Empat. Hasil penelitian ini memberikan implikasi praktis bagi pimpinan STIE Pasaman Simpang Empat bahwa untuk meningkatkan bobot keputusan mahasiswa didalam memilih kuliah di Perguruan Tinggi ini yang berimplikasi juga paka tingkat kepuasan dan loyalitas sebagai perilaku paska pemilihan, maka perlu peningkatan pada aspek motivasi, persepsi dan promosi. Kata kunci : Motivasi, persepsi, promosi dan keputusan memilih.
This research aims to integrate agroindustry and sustainability development into chemistry learning through the Project-Based Learning model (PjBL) to improve the competence of preservice chemistry teachers. This research employed the qualitative method. The Summer Course program was held collaboratively by Universitas Negeri Jakarta, Institut Pertanian Bogor, and Villanova University. The program was implemented online within six weeks due to the COVID-19 pandemic. The participants consisted of 25 students. The data had been collected through interviews, questionnaires, observations, student portfolios, and reflection journals. Based on the analysis, several projects developed by preservice chemistry teachers increased the application to solve sustainability problems in the agroindustry field. Furthermore, the project was expected to be developed into a natural product that can increase the agroindustry value for coffee farmers. The findings also foster the preservice chemistry teachers to improve their creative thinking, collaboration, higher-order thinking skills, and problem-solving skills. Besides, they developed their communication and collaboration after participating in the program. The paper outline is a project development learning experience in a sustainable field and would be a good resource for student-teacher involvement in teacher education.
Emotional dysregulation in early childhood has shown various early symptoms, such as aggressiveness, anxiety, short attention span, etc. This study aims to determine the effects of family cohesion, interpersonal communication, and smartphone addiction variables on children's emotional dysregulation. The respondents of this study were 338 students’ parents from Cirebon City, Indonesia. Data were collected by means of online questionnaires distributed individually to each kindergarten selected using proportionate cluster random sampling. The results of this study show that two variables, namely family cohesion (p = .031) and interpersonal communication (p = .016) have negative direct effects on children's emotional dysregulation. Meanwhile, smartphone addiction (p = .000) directly affects children's emotional dysregulation. From the results, it is assumed that children's emotional dysregulation will decrease when there is a focus on improving the quality of family cohesion and on decreasing the level of smartphone addiction. Besides, the government, schools, and parents should concern about and implement a policy to keep on monitoring children when using smartphones and developing positive and harmonious family cohesion.
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