Judul: Analysis of Sharia Stock Portfolio Formation Using Joel Greenblatt Magic Formula
Abstrak: Risiko adalah hal yang tidak terhindarkan ketika seseorang berinvestasi di pasar modal. Salah satu cara yang dapat dilakukan untuk meminimalisir risiko adalah dengan melakukan diversifikasi atau membentuk portofolio investasi. Tujuan penelitian ini adalah untuk menganalisis bentuk portofolio investasi dengan metode Magic Formula yang diperkenalkan oleh Joel Greenblatt. Portofolio yang telah dibentuk kemudian akan dilakukan evaluasi kinerja dengan menggunakan indeks Sharpe, indeks Treynor, dan indeks Jensen. Hasil penelitian menunjukkan bahwa portofolio investasi Magic Formula mampu memberikan imbal hasil yang lebih tinggi dibandingkan dengan indeks acuan pada Juni 2018 sampai dengan Mei 2021 yaitu sebesar -1,72% berbanding dengan indeks acuan sebesar -3,26%. Hal tersebut menunjukkan bahwa portofolio Magic Formula memiliki kinerja yang lebih baik dibandingkan dengan indeks acuan karena dapat memberikan imbal hasil lebih besar dengan risiko yang kecil.
Keyword: Joel Greenblatt, Magic Formula, Portfolio, Sharia Stock

Judul: Optimal Portofolio Formation Using the  Markowitz Model on the IDX Sharia Growth Stock Index for the Period of 2023
Abstrak: Bursa Efek Indonesia telah memfasilitasi investor saham syariah ketika mencari pedoman dalam membentuk portofolio di pasar saham syariah, yaitu dengan membuat indeks saham syariah. Namun, jumlah investor saham syariah di Indonesia belum teroptimalkan. Oleh karena itu, penelitian ini bertujuan untuk membentuk sebuah portofolio optimal yang mempertimbangkan tingkat risiko dan tingkat pengembalian yang diharapkan pada indeks saham syariah IDX Sharia Growth Periode 2023. Portofolio optimal ini diharapkan menjadi rekomendasi dan bahan pertimbangan kepada investor saham syariah ketika melakukan pengambilan keputusan dalam berinvestasi. Metode penelitian ini mengadopsi Model Markowitz dengan metrik sharpe ratio optimal dan diolah menggunakan aplikasi Microsoft Excel. Hasil penelitian ini menghasilkan 9 kombinasi saham syariah yang membentuk portofolio optimal, dengan tingkat pengembalian portofolio yang diharapkan sebesar 51,21%, risiko portofolio sebesar 14,03%, dan nilai sharpe ratio optimal sebesar 44,87%., The Indonesia Stock Exchange has facilitated Islamic stock investors when looking for guidelines in forming portfolios in the Islamic stock market, namely by creating an Islamic stock index. However, the number of Islamic stock investors in Indonesia has not been optimized. Therefore, this study aims to form an optimal portfolio that considers the level of risk and the expected rate of return on the IDX Sharia Growth Islamic stock index for the period 2023. This optimal portfolio is expected to be a recommendation and consideration for Islamic stock investors when making investment decisions. This research method adopts the Markowitz Model with the optimal sharpe ratio metric and is processed using the Microsoft Excel application. The results of this study resulted in 9 combinations of Islamic stocks that form the optimal portfolio, with an expected portfolio return of 51.21%, a portfolio risk of 14.03%, and an optimal sharpe ratio value of 44.87%.
Keyword: IDX Sharia Growth, Model Markowitz, Portofolio Optimal, Sharpe Ratio

Judul: Biology and ecology of the buffalo fly, haematobia exigua de meijere (diptera:muscidae)
Abstrak: The life history of the buffalo fly was observed at room temperature of 27°-29.5°C and at a relative humidity of 48-68 percent. The eggs hatched after 17-22 hours, with an average of 18 hours. First instar larvae measured 1.25 + 0.16 mm long and 0.27 + 0.037 mm wide. reach the second larval stage. It took 6-12 hours to the second instar larvae measured 2.676 +0.187 mm long and 0.353 +0.028 mm wide. The second instar took about 12-24 hours to reach the third larval stage. The third instar measured 6.833 + 0.189 mm long and 0.919 + 0.051 mm wide. It took about 2-3 days for the third instar to become pupae. Duration of the pupal stage was about 5-7 days before the adults emerged. Under laboratory condition, the buffalo fly completed its life cycle in 9.5 to 10.5 days, whereas under field condition it took 9-14 days with an average of 10.5 days. The growth ratio which was based on the measurements of the cephalo-pharyngeal skeleton of each instar was 1.797. The preoviposition period was 8-12 days and mating usually occurred on the 6th or 7th day. The longevity of the male was 29 days, whereas it was 32 days in the female. The range of egg production under laboratory condition was between 20-139 per female fly. The belly and hind legs of the carabao were the most preferred habitat either during cloudy and cool dry or shiny and warm day. When the weather was clear and the carabao was in the shade, the flies tended to be more distributed particularly on the shoulder, dewlap, back and horns. The carabaos had relatively fewer Musca sp. and Stomoxys calcitrans than cattle; never the less carabaos had a higher infestation of buffalo fly than cattle. Oviposition occured either during the day or night but the buffalo flies were more active during the night than in the day time. The effect of various lengths of exposure time of manure in relation to the oviposition was profound. observed, the maximum number of the buffalo flies was occurred when the dung was exposed for 30 minutes. With increasing time of exposure the number and variety of insects also increase. It was evident that Sepsidae and psychodidae were the most dominant insects emerging from the dung. The number of buffalo flies also increased with increasing
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