Judul: Financial Performance Before and During Covid and Its Effect on Stock Returns in Telecommunication Companies on the Indonesia Stock Exchange.
Abstrak: Pandemi Covid-19 turut melemahkan perekonomian Indonesia. Perusahaan dituntut bekerja efektif agar bertahan di kondisi yang volatil. Pengukuran kinerja keuangan menjadi dasar evaluasi apakah perusahaan bekerja efisien memanfaatkan modal serta menghasilkan nilai tambah bagi para pemegang sahamnya. Penelitian ini bertujuan menganalisis perbedaan kinerja keuangan perusahaan sebelum dan saat Covid menggunakan metode economic value added dan market value added serta menganalisis pengaruhnya terhadap return saham. Pengambilan sampel mengunakan metode purposive sampling dan diperoleh empat perusahaan subsektor telekomunikasi selama 2017-2022. Teknik analisis data menggunakan analisis statistik deskriptif, uji beda, dan analisis data panel dengan regresi linear berganda. Hasil penelitian mendeteksi perbedaan MVA yang turun signifikan daripada nilai sebelum Covid, EVA saat Covid mengalami kenaikan daripada sebelum Covid namun tidak signifikan. Hasil analisis regresi data panel menunjukkan bahwa EVA dan MVA tidak memiliki pengaruh signifikan terhadap return saham., The Covid-19 pandemic has weakened the Indonesian economy. Companies are expected to work effectively to survive in volatile conditions. Financial performance measurement becomes the basis for evaluating whether the company has worked efficiently in utilizing capital and generating added value for shareholders. This study aimed to analyze the differences in company's financial performance before and during Covid using the economic value added and market value added methods and to analyze their effect on stock returns. Sampling used a purposive sampling method and obtained four telecommunication subsector companies during 2017-2022. The data analysis technique used descriptive statistical analysis, difference test, and panel data analysis method with multiple linear regression. The results detected differences in MVA which dropped significantly from the value before Covid, EVA during Covid increased than before Covid but was not significant. The results of panel data regression analysis showed that EVA and MVA have no significant effect on stock returns.
Keyword: Covid, EVA, kinerja keuangan, MVA, return saham

Judul: Analisis Kinerja Keuangan Perusahaan Farmasi Terindeks Syariah dan Pengaruhnya Terhadap Harga Saham Sebelum dan Saat Pandemi Covid-19
Abstrak: Pandemi Covid-19 telah menjadi ancaman kesehatan bagi manusia di seluruh penjuru dunia. Untuk mengatasi hal tersebut, sektor farmasi menjadi salah satu kunci. Kondisi ini terlihat sebagai peluang bagi investor untuk meraih pendapatan saat melemahnya ekonomi di Indonesia. Menangkap persoalan tersebut, peneliti ingin menganalisa lebih lanjut terkait perusahaan guna memperoleh bukti empiris terkait perbedaan kinerja keuangan dan pengaruhnya terhadap harga saham pada perusahaan farmasi terindeks syariah sebelum dan saat pandemi Covid-19. Metode analisis data menggunakan analisis deskriptif, analisis uji beda, dan analisis regresi data panel. Hasil penelitian menunjukkan bahwa sebelum dan saat pandemi Covid-19, untuk variabel BVPS terdapat perbedaan signifikan pada empat dari lima perusahaan. Untuk variabel harga saham dan ROA tidak terdapat perbedaan signifikan pada keseluruhan perusahaan, Untuk analisis regresi data panel, terdapat pengaruh signifikan pada variabel ROA, EPS, PER, BVPS terhadap harga saham, sedangkan untuk variabel dummy Covid-19 tidak memiliki pengaruh yang signifikan terhadap harga saham.
Keyword: covid-19, pharmaceuticals, Financial performance, Islamic stocks, Stock price

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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