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: Persepsi Risiko dan Tingkat Kecemasan selama masa Pandemi Covid-19 pada Masyarakat di Indonesia
Abstrak: Risk perception is an individual subjective assessment of the characteristics and severity of a risk. It affects human life strategy and is essential for human survival. Several factors may influence a person’s risk perception levels; one of them is anxiety level. A person’s anxiety level may change as a response to environmental changes such as the global outbreak of coronavirus disease (Covid-19). Previous researches in several countries have shown a positive relationship between risk perception toward Covid-19 and anxiety level. Different countries showed different variables affected people risk perception, suggesting demographic and cultural background may impact risk perception. There is no data regarding these conditions in Indonesia. Therefore, this study aimed to investigate the correlation between risk perception toward Covid-19 and anxiety level and find out variables that may affect risk-perception toward Covid-19 in Indonesian society. An online survey was conducted to assess perception toward risk caused by Covid-19 (Risk-percept Covid-19 questionnaire), measure the anxiety level of Indonesian society (GAD-7 questionnaire), and demographic data. From a total of 1147 respondents, we found that most of the respondents (620 individual) are categorized as individuals with a minimal anxiety level. The higher a person’s anxiety level, the higher the perception of risk caused by Covid-19, which is similar to other countries. Risk perception decreased along with increasing age. Higher income and get the covid-19 vaccine significantly increase Indonesian’s risk perception towards Covid-19. These results imply that the risk perception of Indonesian’s society during Covid-19 pandemic is affected by financial and health conditions., Persepsi risiko adalah penilaian subjektif individu terkait karakteristik dan tingkat keparahan suatu risiko. Persepsi risiko dapat mempengaruhi strategi kehidupan manusia dan sangat penting bagi kelangsungan hidup manusia. Beberapa faktor dapat mempengaruhi tingkat persepsi risiko seseorang; salah satunya adalah tingkat kecemasan. Tingkat kecemasan seseorang dapat berubah sebagai respon terhadap perubahan lingkungan, salah satu contoh perubahan lingkungan yang terjadi ialah wabah pandemi Covid-19. Penelitian sebelumnya di beberapa negara menunjukkan adanya hubungan positif antara persepsi risiko terhadap Covid-19 dengan tingkat kecemasan. Perbedaan negara dapat mempengaruhi variabel yang dapat mempengaruhi persepsi risiko seseorang. Hal ini menunjukkan latar belakang demografi dan budaya kemungkinan mempengaruhi persepsi risiko. Sampai saat ini, belum ada data mengenai kondisi tersebut di Indonesia. Penelitian ini bertujuan mengetahui hubungan antara persepsi risiko terhadap Covid-19 dengan tingkat kecemasan dan mengetahui variabel yang dapat mempengaruhi persepsi risiko terhadap Covid-19 pada masyarakat di Indonesia. Penelitian ini dilakukan melalui survey online untuk mengukur tingkat kecemasan masyarakat Indonesia (kuisioner GAD-7), menilai persepsi terhadap risiko yang disebabkan oleh Covid-19 (kuisioner risk-percept Covid-19), dan data demografi. Dari total 1147 responden, studi ini menemukan bahwa sebagian besar responden (620 individu) dikategorikan sebagai individu dengan tingkat kecemasan minimal. Semakin tinggi tingkat kecemasan, semakin tinggi pula persepsi risiko terhadap Covid-19. Persepsi risiko menurun seiring dengan meningkatnya usia. Pendapatan yang lebih tinggi dan telah vaksin Covid-19 secara signifikan meningkatkan persepsi risiko masyarakat Indonesia terhadap Covid-19. Hasil ini mengimplikasikan bahwa persepsi risiko masyarakat Indonesia dipengaruhi oleh kondisi finansial dan kesehatan.
Keyword: Anxiety level, Covid-19, Indonesian society, risk perception, vaccine

Judul: Apatite Growth Optimation on Chicken Mucouse by Fourier Transform Infrared (FTIR) Characterization
Abstrak: Some experiment had been conducted to grow apatite from supersaturated solution of calcium phosphate ions on chicken mucouse. The calcium and phosphate ions were originated from Ca(NO3)2 and (NH4)2HPO4. Carbonate ions from (NH4)2CO3 was also used as starting solution. Experiment was carried out within about 5 hours at temperature 370 C and pH 7. Value of Ca+ : PO4 3- was 1.67, while molar ratio of CO3 2- : PO4 3- was 0.5 : 1. Molarity of molar ratio CO3 2- : PO4 3- variated approximately 0.15 : 0.30, 0.51 : 1.02, and 0.90 : 1.80. Mass of mucouse powder was constant 0.75 gram. The analysis result of Fourier Transform Infrared (FTIR) showed that the precipitation was apatite carbonate type A and B. In these experiment it was found out that the mucouse reduce the crystallinity of apatite precipitant, and the growth of apatite crystal was optimum at solution with molar ratio CO3 2- : PO4 3- about 0.15 : 0.30.
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