Judul: Fenomena Overreaction Jangka Pendek Saham Syariah di Indonesia terhadap COVID-19
Abstrak: COVID-19 merupakan peristiwa yang menimbulkan dampak buruk di berbagai sektor salah satunya adalah sektor pasar modal. Kondisi ketidakpastian yang tinggi akibat mewabahnya COVID-19 menyebabkan investor bereaksi terhadap peristiwa tersebut sehingga dapat menimbulkan fenomena overreaction. Peristiwa yang diambil dalam sampel penelitian ini sejumlah tujuh peristiwa terkait COVID-19. Penelitian ini bertujuan untuk menganalisis fenomena overreaction pada saham syariah dan faktor yang memengaruhinya dengan menggunakan metode uji beda dan cross sectional regression. Hasil penelitian menunjukkan bahwa Pengumuman transmisi COVID-19 dan lockdown (Event 2) menyebabkan overreaction pada saham winner. Fenomena overreaction saham loser disebabkan oleh pengumuman stimulus fiskal Amerika Serikat (Event 5) dan pengumuman PSBB (Event 6). Peristiwa pengumuman new normal (Event 7) menyebabkan saham winner maupun loser mengalami overreaction. Faktor yang memengaruhi fenomena overreaction pada peristiwa tersebut terbukti secara signifikan dan berhubungan negatif adalah leverage dan kapitalisasi pasar, sedangkan volume perdagangan secara signifikan memengaruhi dan memiliki hubungan positif dengan fenomena overreaction., COVID-19 is an event that has harmed various sectors, one of which is the capital market sector. The high uncertainty caused by the COVID-19 outbreak caused investors to react to this event, which could cause an overreaction phenomenon. The events taken in this study sample are seven events related to COVID-19. This study aims to analyze the phenomenon of overreaction in Islamic stocks and the factors that influence the phenomenon of overreaction by using the two-sample difference test method and cross-sectional regression. The results showed that the announcement of COVID-19 transmission and lockdown (Event 2) caused overreaction in winner stocks. The phenomenon of loser stock overreaction was caused by the announcement of the United States fiscal stimulus (Event 5) and the announcement of the PSBB (Event 6). The new normal announcement event (Event 7) caused Islamic stocks both winner and loser to experience overreaction. The factors that influence the overreaction phenomenon in this event are proven to be significantly and negatively influenced by leverage and market capitalization, while trading volume had a significant effect and positively influence the overreaction phenomenon.
Keyword: COVID-19, cross sectional regression, overreaction

Judul: Overreaction Phenomenon on Sharia Stocks in Indonesia During COVID-19 Pandemic
Abstrak: Pandemi COVID-19 memberikan dampak yang meluas hingga sektor pasar modal. Penurunan harga saham terjadi pada saham syariah Indonesia di masa tersebut. Berbagai informasi selama pandemi membuat investor memberi reaksi yang berlebihan dan menyebabkan ketidakefisienan pasar. Penelitian ini bertujuan untuk mengidentifikasi fenomena overreaction pada saham syariah serta menganalisis faktor-faktor yang memengaruhinya. Pendekatan yang digunakan dalam penelitian ini ialah event study. Hasil uji beda menunjukkan bahwa fenomena overreaction terjadi pada portofolio saham winner saat pengumuman kasus COVID-19 pertama di Indonesia (Event 1), sedangkan pada peristiwa penerbitan program PEN (Event 3), kedatangan vaksin COVID-19 di Jakarta (Event 6), dan kenaikan kasus positif harian COVID-19 tertinggi per-Agustus 2021 (Event 10) fenomena overreaction terjadi pada portofolio saham winner-loser. Hasil cross sectional regression menunjukkan bahwa faktor-faktor yang signifikan memengaruhi fenomena overreaction yaitu abnormal return, kebocoran informasi, dan kepemilikan perusahaan yang terbukti secara signifikan dan berhubungan negatif terhadap nilai cumulative abnormal return (CAR) pada periode setelah peristiwa sebagai indikator dari fenomena overreaction., COVID-19 pandemic has a widespread impact on the capital market sector. The decline in stock prices occurred in Indonesian Islamic stocks at that time. Various information during the pandemic made investors overreact and led to market inefficiency. This study aims to identify the phenomenon of overreaction in Islamic stocks and analyze the factors that influence it. The approach used in this research is event study. The results show that overreaction occurred in winner stocks during the announcement of the first COVID-19 case in Indonesia (Event 1), while in the event of the issuance of the PEN program (Event 3), the arrival of the COVID-19 vaccine in Jakarta (Event 6), and the increase in The highest daily positive COVID-19 cases per August 2021 (Event 10) overreaction phenomenon occurred in winner-loser stocks. The results of cross sectional regression show that abnormal returns, leakage of information, and institutional ownership has a significant negative effect to cumulative abnormal return (CAR) in the period after the event as an indicator of the overreaction phenomenon.
Keyword: COVID-19, cross sectional regression, event, overreaction

Judul: Synthesis of Apatite - Chitosan Composite Using Duck Eggshell and Chitosan with Temperature and pH Control
Abstrak: Composite of apatite-chitosan was prepared by using chitosan as polymer matrix. Calcium phosphate was prepared from CaO and (NH4)2HPO4, which the ratio Ca : P had to be 1.67. Chitosan is produced by deacetilase from biopolymer chitin. Duck eggshell (95% CaCO3) as starting material was converted to be calcium oxide (CaO) through calcinations with temperature 1000oC for 5 hours. In-situ and ex-situ methods were prepared from apatite and chitosan (dissolved with acetate acid 2%). Calcium phosphate prepared for bone implantation, but it is too fragile and brittle to be implant into the body. So addition of chitosan can decrease crystalinity and increase mechanic characteristic (tougher). Composite apatite-chitosan was resulted by fast precipitation. Fast precipitation was held in a breaker glass with nitrogen atmosphere, under controlled temperature at 37oC and pH 7, in order to increase amount of hydroxyapatite. Precipitation with CaO which was dropped by (NH4)2HPO4. Hydroxyapatite and chitosan were appearing at samples with in-situ and ex-situ methods which indicating by peak matching of XRD (closed lattice parameter, crystal size), overlapping at FTIR spectra and supporting by SEM picture (homogenous and agglomerated particle). However, it still needs further research to examine biocompatibility osteoconductive degree of sample by in-vivo and in-vitro test.
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