Judul: Optimal Portfolio Formation with Passive and Active Strategies during Pre, Period, and Post Covid-19 Pandemic
Abstrak: Munculnya Pandemi Covid-19 menyebabkan peningkatan inefisiensi dan risiko pasar saham. Untuk mengurangi risiko, dilakukan diversifikasi dengan membentuk portofolio. Dikarenakan investor tidak boleh berinvestasi pada satu sektor saham saja, pembentukan portofolio pada penelitian ini dilakukan pada perwakilan sebelas sektor saham IDX-IC di BEI. Penelitian ini dilaksanakan pada April hingga Juli 2024 menggunakan metode Markowitz dengan strategi pasif dan aktif. Hasil penelitian ini menunjukkan bahwa Pandemi Covid-19 menyebabkan terjadinya penurunan return dan peningkatan risiko portofolio. Ditinjau dari segi komposisi saham, pada periode pra pandemi, sektor yang mencatatkan komposisi terbesar adalah sektor Barang Konsumen Primer, kemudian pada periode masa pandemi yaitu sektor Perindustrian dan Barang Konsumen Non-Primer, dan pada periode pasca pandemi yaitu sektor Keuangan. Strategi optimal pembentukan portofolio jika ingin meminimalkan risiko adalah strategi pasif, sementara jika ingin memaksimalkan return adalah strategi aktif., The emergence of the Covid-19 Pandemic has led to an increase in stock market inefficiency and risk. To decrease the risk, diversification is conducted by forming a portfolio. Due to the investor should not invest in only one stock sector, portfolio formation in this research was conducted on representatives of eleven IDX-IC stock sectors on the IDX. This research was conducted from April to July 2024 using the Markowitz method with passive and active strategies. The results of this research show that the Covid-19 Pandemic causes a decrease in return and an increase in portfolio risk. In terms of stock composition, in the pre-pandemic period, the sector that has the largest composition is the Primary Consumer Goods sector, while in the pandemic period is the Industry and Non-Primary Consumer Goods sectors, and in the post-pandemic period is the Financial sector. The optimal strategy for portfolio formation if you want to minimize risk is a passive strategy, while if you want to maximize returns is an active strategy.
Keyword: Markowitz Method, Optimal Portfolio, Stock, Passive & Active Strategy

Judul: SRI-KEHATI Index Investor Response to the Determination of the Status of the COVID-19 Pandemic in Indonesia
Abstrak: Penetapan COVID-19 sebagai pandemi di Indonesia melalui Keputusan Presiden Nomor 11 tahun 2020 tentang Penetapan Kedaruratan Kesehatan Masyarakat Coronavirus Disease 2019 berpotensi menghasilkan reaksi pasar terutama pada indeks SRI-KEHATI yang dinilai relatif lebih stabil dan diharapkan mampu bertahan pada kondisi sulit. Penelitian dilakukan untuk mengetahui apakah indeks SRI-KEHATI dapat digolongkan berkinerja baik pada kondisi tidak normal selama pandemi COVID-19. Penelitian menggunakan metode event study dengan metode penarikan sampel purposive sampling diukur dengan rentang waktu 5 hari sebelum dan 5 hari sesudah peristiwa serta 120 hari periode estimasi. Teknik analisis data menggunakan uji normalitas Shapiro-Wilk uji beda dengan pendekatan Paired Sample T-test dan Wilcoxon Signed rank test dengan peranti lunak SPSS 25. Hasil dari penelitian ini menunjukan bahwa penetapan pandemi COVID-19 di Indonesia tidak memberikan reaksi yang signifikan pada abnormal return dan trading volume activity pada perusahaan yang terdaftar dalam Indeks SRI-KEHATI di Bursa Efek Indonesia., The Declaration of COVID-19 as a pandemic in Indonesia through Presidential Decree No. 11 of 2020 on the Declaration of a Public Health Emergency for Coronavirus Disease 2019 had the potential to trigger market reactions, particularly on the SRI-KEHATI index, which was considered relatively stable and expected to withstand challenging conditions. This research was conducted to determine whether the SRI-KEHATI index could be classified as performing well during abnormal conditions amid the COVID-19 pandemic. The study utilized the event study method with purposive sampling, measured within a 5-day window before and after the event, and a 120-day estimation period. Data analysis employed the Shapiro-Wilk test for normality, paired sample T-test, and Wilcoxon signed-rank test using SPSS 25 software. The findings of this study indicated that the declaration of the COVID-19 pandemic in Indonesia did not significantly affect abnormal return and trading volume activity for companies listed in the SRI-KEHATI Index on the Indonesia Stock Exchange.
Keyword: abnormal return, trading volume activity, event study, SRI-KEHATI

Judul: Karakteristik Imago Jantan Ulat Sutera Liar Attacus atlas (Lepidoptera : Saturniidae)
Abstrak: This study aims to describe various morphometric parameters of male A. atlas moth, to found a correlation between the morphometric parameters and body weight on male moths, and to describe the reproductive system of male A. atlas moth. Male can distinguish from the female by comparing the antennae. The antennae of male is wider. There is a very strong correlation between the total body length and the body weight in linear equation Y = 0.875 X-1, 639 when Y is the weight in grams and X is the total body length in cm. Reproductive system of male A. atlas moth generally similer to B. mori reproductive system. Male A. atlas moth has reproductive system consists of a pair of testes, a pair of deferent duct with ampula ductus deferent, one spermatophore gland, one alba gland, one prostatica gland and one penis.
Keyword: reproductive system, Attacus atlas, morphometric