The Covid-19 virus that spreads globally has an impact on economic growth in Indonesia. Several business sectors have experienced a decline in performance due to the government's restrictions on outdoor activities to prevent the spread of this virus. For this reason, SMEs must be able to adjust their marketing channels from offline to online to optimize marketing performance during the Covid-19 pandemic. One of the online marketing tools is social media. This study investigates the use of social media on marketing performance with innovation capability and branding capability as mediating variables. This study uses 200 samples of respondents who are the owners of SMEs that collected through an online questionnaire. We use the Partial Least Square (PLS) method to test the hypothesis. The results of this study indicate that social media has a significant effect on innovation capability and branding capability and helps SMEs improve their marketing performance. This research also proves that innovation capability and branding capability successfully mediate the influence of the relationship between social media use on marketing performance.

Untuk menguasai dan menciptakan teknologi di masa depan diperlukan penguasaan matematika yang kuat. Penelitian yang dilakukan oleh TIMSS dan PISA menunjukkan bahwa prestasi belajar matematika siswa Indonesia usia 15 tahun tergolong masih rendah jika dibandingkan dengan prestasi belajar matematika siswa lain di dunia. Beberapa faktor yang memengaruhi prestasi belajar matematika ini diantaranya adalah self-efficacy dan mathematic anxiety. Tujuan penelitian ini adalah untuk menguji perbedaan prestasi belajar matematika ditinjau dari self-efficacy dan mathematic anxiety. Penelitian ini menggunakan desain kuantitatif non-experimental dengan menggunakan teknik dan analisis Mann-Whitney. Partisipan penelitian ini adalah siswa SMP dari tiga sekolah yang ada di Depok sebanyak 385 orang. Teknik pengambilan sampel dengan purpossive sampling. Pengambilan data dilaksanakan pada bulan Oktober 2016. Instrumen penelitian berupa kuesioner self-efficacy dan mathematic anxiety dengan skala Likert serta data sekunder prestasi belajar matematika siswa berupa nilai rapor terakhir. Hasil penelitian pengujian hipotesis dilakukan dengan analisis Mann-Whitney. Hasil penelitian menunjukkan (Z = -2,791 dan p = 0.005 < 0,05)  bahwa ada perbedaan prestasi belajar matematikaditinjau dari self-efficacy (self-efficacy rendah dan tinggi). Hasil penelitian juga menunjukkan (Z = -2,695 dan p sebesar 0.007 < 0,05) bahwa ada perbedaan prestasi belajar matematikaditinjau dari mathematic anxiety (mathematic anxiety rendah dan tinggi). Hasil penelitian ini dapat memprediksikan prestasi belajar matematikasiswaberdasarkan self-efficacy dan mathematic anxiety yang dimiliki oleh siswa tersebut.Kata kunci: self-efficacy, mathematic anxiety, prestasi belajar matematika, matematika

Nanocomposite has gain great attention in many applications due to its better properties in nanoscale. Chitosan-Zeolite-ZnO nanocomposite were prepared via sol-gel method and were analysed by molecular docking study to predict its antiviral activity against SARS CoV-2. The SARS CoV-2 glycoprotein as receptor from RCSB PDB and complex ligand of Chitosan-Zeolite and ZnO were chosen as interaction model between ligand and receptor. According to free binding energy, it was found that chitosan has better potency in nanocomposite against SARS Cov-2.