Judul: Faktor-faktor yang Berasosiasi dengan Persepsi Risiko,  Kecemasan, dan Perilaku Prefentif selama Fase Covid-19 yang Berbeda di  Indonesia
Abstrak: Human can assess characteristics, severity, and potential losses caused by a threat, known as risk perception. Risk perception is associated with anxiety. A person's anxiety level may change as a response to environmental changes, for example, the global outbreak of the Covid-19 situation. Studies in other countries found an association between the progress of Covid-19 situation with lower perceived risk of Covid-19, lower anxiety level, and lower frequency of preventive behavior. However, as Indonesia’s demographics and Covid-19 situation may differ from other countries, there may be differences in Indonesian risk perception to Covid-19, anxiety level, and preventive behavior from prior findings. Thus, this study investigated differences and factors associated with risk perception, anxiety level, and preventive behavior to Covid-19 as the pandemic progressed in Indonesia. Data were collected twice (1st phase on July to August 2021 and 2nd phase on July to September 2022). A total of 2294 respondents in each phase completed a questionnaire on their risk perception to Covid-19 (Risk-percept Covid-19 questionnaire), anxiety level (GAD-7 questionnaire), and preventive behaviour during Covid-19. We found that Indonesian risk perception toward Covid-19 significantly associated with age and anxiety levels. Anxiety levels significantly decline with age. Preventive behaviors decreased over time, but higher risk perception toward Covid-19 and anxiety levels were still associated with a higher frequency of preventive behavior in both phases. However, in 2nd phase, we found that receiving the Covid-19 vaccine was associated with a lower frequency of preventive behavior. As the situation of Covid-19 in Indonesia progressed over time, our findings suggest that there was a decline in Indonesian people’s preventive behavior when the vaccine became widely available., Manusia dapat menilai karakteristik, tingkat keparahan, dan potensi kerugian yang dapat disebabkan oleh suatu ancaman, yang dikenal sebagai persepsi risiko. Persepsi risiko berhubungan dengan kecemasan. Tingkat kecemasan seseorang dapat berubah sebagai respons terhadap perubahan lingkungan, misalnya, wabah global Covid-19. Studi di negara lain menemukan hubungan antara perkembangan situasi Covid-19 dengan persepsi risiko terhadap Covid-19 yang lebih rendah, tingkat kecemasan yang lebih rendah, dan frekuensi perilaku pencegahan terhadap Covid-19 yang lebih rendah. Namun, karena demografi dan situasi Covid-19 di Indonesia yang berbeda dengan negara lain, mungkin akan ada pula perbedaan faktor yang berasosiasi dengan persepsi risiko terhadap Covid-19, tingkat kecemasan, dan perilaku pencegahan terhadap Covid-19 di Indonesia dengan temuan sebelumnya. Oleh karena itu, penelitian ini ingin menyelidiki faktor yang berasosiasi dengan persepsi risiko, tingkat kecemasan, dan perilaku pencegahan terhadap Covid-19 seiring dengan perkembangan pandemi Covid-19 di Indonesia. Data dikumpulkan sebanyak dua kali (tahap pertama pada Juli hingga Agustus 2021) dan tahap kedua (Juli hingga September 2022). Sebanyak 2.294 responden di setiap fase menyelesaikan kuesioner tentang persepsi risiko mereka terhadap Covid-19 (Risk-percept Covid-19 questionnaire), tingkat kecemasan (GAD-7), dan perilaku pencegahan selama Covid-19. Kami menemukan bahwa secara signifikan persepsi risiko berasosiasi dengan usia dan tingkat kecemasan. Tingkat kecemasan menurun secara signifikan seiring dengan bertambahnya usia. Perilaku pencegahan menurun seiring berjalannya waktu, tetapi persepsi risiko yang lebih tinggi terhadap Covid-19 dan tingkat kecemasan masih berhubungan dengan frekuensi perilaku pencegahan yang lebih tinggi di kedua fase. Namun, pada fase kedua, kami menemukan bahwa menerima vaksin Covid-19 dikaitkan
Keyword: COVID-19, demographic, Indonesia, preventive behavior, vaccine

Judul: Analysis of  Covid-19 Risk Perception Survey Results Using Generalized Structured Component Analysis
Abstrak: Ibu kota Indonesia, DKI Jakarta, menjadi provinsi dengan jumlah Covid-19 tertinggi. Merespon hal ini, LaporCovid-19 bekerja sama dengan Social resilience Lab, Nanyang Technological University melakukan survei untuk mengukur bagaimana persepsi warga Jakarta terhadap risiko Covid-19 mulai 29 Mei hingga 20 Juni 2020. Peubah yang memengaruhi persepsi risiko merupakan peubah yang tidak dapat diukur. secara langsung sehingga dianalisis menggunakan pendekatan Structural Equation Modeling (SEM), yaitu Generalized Structured Component Analysis (GSCA). Skala likert bersifat ordinal tetapi ada beberapa penelitian menggunakan skala likert sebagai interval. Oleh karena itu, penelitian ini akan membandingkan metode GSCA dengan nonlinear GSCA dan mengevaluasi enam peubah, yaitu persepsi risiko, pengetahuan, informasi, peilaku kesehatan, modal sosial, dan ekonomi. Evaluasi model secara keseluruhan menunjukkan bahwa nonlinear GSCA dapat menjelaskan keragaman data kualitatif lebih baik daripada GSCA dengan FIT > 0.9. Nonlinear GSCA menghasilkan peubah informasi berpengaruh terhadap pengetahuan, ekonomi dan modal sosial memiliki hubungan timbal balik, sedangkan pengetahuan dan persepsi risiko berpengaruh terhadap perilaku kesehatan., The capital city of Indonesia, Jakarta, became the province with the highest number of Covid-19. Response this situation, LaporCovid-19 collaborate with the Social Resilience Lab, Nanyang Technological University conducted a survey to measure how Jakarta residents perceive the risk of Covid-19 from May 29 to June 20 2020. Factors of risk perception are variables that cannot be measured directly, so they are analyzed used a Structural Equation Modeling (SEM) approach, namely Generalized Structured Component Analysis (GSCA). The Likert scale used can be considered as interval or ordinal depending on the point of view of the theory built. Therefore, this study will compare the GSCA method with the nonlinear GSCA and evaluate six variables, namely risk perception, knowledge, information, health behavior , social capital, and economy. Evaluation of the overall model showed that the nonlinear GSCA model can explain the diversity of qualitative data better than the GSCA model with FIT > 0.9. Based on GSCA nonlinear model, information has significantly influence of knowledge, economy and social capital have a real reciprocal relationship, along knowledge and risk perception have significantly influence of health behavior.
Keyword: persepsi risiko, SEM, GSCA, nonlinear GSCA

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.
Keyword: