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 serta Pengaruhnya terhadap Return Saham pada Perusahaan Telekomunikasi di Bursa Efek Indonesia.
Abstrak: Kinerja keuangan perusahaan merupakan suatu gambaran tentang kondisi keuangan suatu perusahaan yang di analisis dengan alat-alat analisis keuangan. Tujuan penelitian ini adalah untuk menganalisis kinerja keuangan perusahaan serta menganalisis pengaruh kinerja keuangan terhadap return saham. Data yang digunakan merupakan data sekunder yang diperoleh dari laporan tahunan dan laporan keberlanjutan dari perusahaan subsektor telekomunikasi yang telah terdaftar sebagai emiten di BEI selama periode 2013–2017. Metode analisis penelitian untuk kinerja keuangan menggunakan metode Economic Value Added (EVA) dan Market Value Added (MVA). Serta untuk pengolahan dan analisis pengaruh kinerja keuangan terhadap return saham menggunakan metode regresi data panel dengan perangkat Eviews 9. Hasil analisis kinerja keuangan menunjukkan bahwa PT XL Axiata Tbk dan PT Telekomunikasi Indonesia Tbk menghasilkan EVA yang positif, lalu MVA positif hanya dicapai oleh PT Telekomunikasi Indonesia Tbk. Selanjutnya, dari analisis regresi menunjukkan bahwa EVA tidak berpengaruh signifikan terhadap return saham dan MVA berpengaruh positif signifikan terhadap return saham.
Keyword: EVA, Eviews, kinerja keuangan, MVA, return saham

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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