Judul: Evaluasi Usability Aplikasi Mobile Digitani Menggunakan Metode Concurrent Think Aloud dan System Usability Scale
Abstrak: Aplikasi mobile Digitani merupakan platform yang dapat digunakan untuk mendapatkan informasi terbaru seputar pertanian, konsultasi dengan pakar, dan juga petani dapat berinteraksi dengan petani lainnya. Aplikasi Digitani dikelola oleh Tani Center dan dikembangkan oleh Direktorat Sistem Informasi dan Transformasi Digital IPB yang telah dikembangkan dari versi 1.0 menjadi versi 2.0. Terdapat fitur-fitur seperti artikel, berita, video, artikel konsultasi, konsul tani, forum tani, tanya pakar, dan daftar penyuluh. Oleh karena itu, dilakukan evaluasi usability terhadap aplikasi Digitani versi 2.0 kepada para pengguna, khususnya kepada petani. Penelitian ini bertujuan untuk melakukan evaluasi usability pada aplikasi Digitani menggunakan metode concurrent think aloud dan system usability scale, serta memberikan rekomendasi perbaikan usability berdasarkan hasil pengujian usability. Evaluasi usability pada aplikasi mobile Digitani versi 2.0 berhasil dilakukan dengan persentase correct conclusion data mencapai 80-100% dan menghasilkan rekomendasi perbaikan usability aplikasi Digitani. Kata Kunci: concurrent think aloud, kebutuhan pengguna, petani, system usability scale, usability, The Digitani mobile application is a platform that can be used to get the latest information about agriculture, consult with experts, and farmers can also interact with other farmers. The Digitani application is managed by the Tani Center and developed by the Directorate of Information Systems and Digital Transformation of IPB which has been developed from version 1.0 to version 2.0. There are features such as articles, news, videos, consultation articles, farmer consults, farmer forums, ask experts, and a list of extension workers. So, usability evaluation of the Digitani version 2.0 application was carried out for users, especially farmers. This study aims to evaluate the usability of the Digitani application using the concurrent think aloud method and the system usability scale, as well as provide usability improvement recommendations based on the results of usability testing. The usability evaluation of the Digitani mobile application version 2.0 was successfully carried out with the correct conclusion data percentage reaching 80-100% and resulting in recommendations for improving the usability of the Digitani application. Keywords: concurrent think aloud, farmer, system usability scale, usability, user needs
Keyword: concurrent think aloud, farmer, system usability scale, usability, user needs

Judul: Perancangan User Experience Aplikasi Digitani untuk Penyuluh Pertanian Menggunakan Metode Five Planes
Abstrak: Pembangunan pertanian membutuhkan kompetensi dari pengguna teknologi. Pihak yang masih kurang terhadap akses sumber informasi yaitu petani sehingga diperlukan dukungan sumber daya penyuluh pertanian. Institut Pertanian Bogor sebagai lembaga pendidikan di bidang pertanian mengembangkan aplikasi Digitani yang membantu dalam penyebaran informasi. Namun, belum sepenuhnya melibatkan penyuluh pertanian. Perancangan aplikasi menggunakan metode Five Planes. Penelitian ini bertujuan untuk meningkatkan user experience aplikasi Digitani berdasarkan kebutuhan penyuluh pertanian menggunakan Retrospective Think Aloud. Evaluasi dilakukan kepada lima responden dengan melakukan pengujian pada 17 task. Hasil evaluasi menunjukkan error rate yang paling tinggi terdapat pada task menyimpan dan membuka artikel yang disimpan sebesar 67% serta terdapat 6 task mobile dan 3 task website yang pengerjaannya melebihi batas waktu yang ditentukan. Secara keseluruhan responden berpendapat bahwa fitur yang diujikan sudah mencakup kebutuhan penyuluh pertanian., Agricultural development requires competence from technology users. Farmers, who still lack access to information sources, require the support of agricultural extension resources. Bogor Agricultural University, as an educational institution in agriculture, developed the Digitani application to help disseminate information. However, agricultural extension workers have not been fully involved in the application's design. The design of the application incorporates the Five Planes method. This research aims to improve the user experience of the Digitani application based on the needs of agricultural extension workers using Retrospective Think Aloud. The evaluation was conducted on five respondents by testing 17 tasks. The evaluation results show that the task of saving and opening stored articles has the highest error rate at 67%, and there are 6 mobile tasks and 3 website tasks that exceed the specified time limit. Overall, respondents believed that the tested features adequately addressed the needs of agricultural extension workers.
Keyword: agricultural extension, five planes, retrospective think aloud

Judul: Hydrothermal Synthesis of Biphasic Calcium Posphate
Abstrak: Biphasio calsium phosphate (BCP), which was a mixture of hydroxypatite (HA) and tricalcium phosphate (TCP), was synthesized by hydrothermal method followed by sintering process. Hydroxyapatite was produced by using natural calcium source CaO from hen's eggshell and (NH4)2HPO4 as phosphate souce, other hydroxyapatite sample was produce by using synthetic calcium source Ca(OH) and H3PO4 as phosphate source.
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