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: Peningkatan Kualitas User Experience Aplikasi Digitani bagi Petani dengan Metode Five Planes
Abstrak: Pada era digital, petani bisa memanfaatkan berbagai teknologi untuk menambah wawasan untuk mengolah berbagai sumber daya dan mengatasi masalah yang menghambat kemajuan pertanian di Indonesia. IPB University menghadirkan sebuah aplikasi Digital Tani (Digitani) dengan tujuan untuk memfasilitasi pertukaran informasi tentang pertanian antara petani, penyuluh pertanian, dan akademisi IPB. Digitani dapat diakses melalui mobile maupun web. Dalam rangka peningkatan user experience, dibutuhkan penelitian mengenai eksplorasi fitur pada Digitani, lalu mengetahui kebutuhan petani yang dapat diterapkan pada aplikasi Digitani. Penelitian yang dilakukan menggunakan metode Five Planes. Hasil penelitian ini menghasilkan user persona, 10 spesifikasi fungsional, low-fidelity prototype, dan high-fidelity prototype. Evaluasi dilakukan kepada 5 responden dengan metode Retrospective Think Aloud. Evaluasi menunjukan error rate tertinggi pada task membaca dan menyimpan artikel sebesar 60% serta terdapat 7 task yang pengerjaanya melewati batas waktu. Evaluasi akan menjadi rekomendasi untuk perbaikan pada pengembangan aplikasi Digitani selanjutnya. Responden merasa prototipe yang dibuat sudah memenuhi kebutuhan petani dalam pertanian., In the digital era, farmers can utilize various technologies to broaden their insights in managing diverse resources and addressing challenges that hinder agricultural progress in Indonesia. IPB University introduces a Digital Farming application (Digitani) with the aim of facilitating the exchange of agricultural information among farmers, agricultural extension officers, and IPB academics. Digitani can be accessed through mobile devices as well as the web. To enhance user experience, research is conducted to explore the features of Digitani and identify farmer's needs that can be integrated into the application. The research employs the Five Planes method, resulting in a user persona, 10 functional specifications, a low-fidelity prototype, and a high-fidelity prototype. Evaluation is conducted with 5 respondents using the Retrospective Think Aloud method. The evaluation indicates the highest error rate in the task of reading and saving articles at 60%, along with 7 tasks exceeding the time limit. The evaluation will serve as recommendations for improvements in the subsequent development of the Digitani application. Respondents feel that the created prototype adequately fulfills farmer's needs in agriculture.
Keyword: farmer, 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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