Judul: Analisis Pembentukan Portofolio Optimal Saham Syariah berdasarkan Jenis Kapitalisasi Pasar Periode 2017-2020
Abstrak: Diversifikasi saham melalui pembentukan portofolio merupakan salah satu cara untuk meminimalisir risiko tanpa harus mengurangi tingkat return. Namun, terdapat banyak sekali kemungkinan pilihan yang dapat terbentuk dari kumpulan saham yang ada, salah satunya pilihan saham yang dapat dilihat dari klasifikasi berdasarkan jenis kapitalisasi pasar. Oleh karena itu, penelitian ini bertujuan untuk menganalisis bentuk portofolio optimal pada kelompok saham syariah berkapitalisasi besar serta kecil dan menengah menggunakan Model Indeks Tunggal (Single Index Model) juga untuk menganalisis kinerja masing-masing portofolio optimal dengan Sharpe Ratio. Hasil penelitian menunjukkan terdapat enam saham sebagai saham pembentuk portofolio optimal saham syariah kapitalisasi besar dan empat saham sebagai saham pembentuk porofolio optimal saham syariah kapitalisasi kecil dan menengah dengan besarnya tingkat risiko dan return portofolio optimal saham syariah kapitalisasi kecil dan menengah lebih besar dari portofolio optimal saham syariah kapitalisasi besar., Stock diversification can be an option to minimize the risk without having to reduce the rate of the return. However, there are lots of options that can be formed from a collection of listing stocks, one of criteria is the choice of stocks which can be classified based on its market capitalization. Therefore, this study aims to analyze the optimal form of big caps portfolios and small-mid caps portfolios of the sharia stocks using the Single Index Model, and to analyze the performance of each optimal portfolio using Sharpe Ratio. The result shows that the optimal portfolios of the big caps stocks consist of six and four stocks as the constituents of the small-mid caps optimal portfolios with the level of risk and return of the optimal portfolio of small and medium capitalization sharia shares greater than the optimal portfolio of large capitalization sharia shares.
Keyword: 

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: Eliminasi PMWaV (Pineapple Mealybug Wilt-associated  Virus) dari jaringan tanaman nanas melalui perlakuan air  panas dan ribavirin
Abstrak: Mealybug wilt of pineapple (MWP) is the devastating disease found in all the major pineapple growing regions of the world. The disease is characterized by severe tip dieback, downword curving of the leaf margins, reddening, and wilting of the leaves that can cause total collapse of the plant. Closterovirus particles were detected in both MWP symptomatic and asymptomatic pineapple worldwide. The particles, referred to as Pineapple Mealybug Wilt-associated Virus-1 and PMWaV-2. Both viruses are mealybug transmitted. Two species of mealybug, the pink mealybug Dysmicoccus brevipes (Cockerell), and the grey mealybug Dysmicoccus neobrevipes (Beardsley) have been associated with MWP. One method for managing MWP disease is rogue symptomatic plant, but this method remain PMWaV at asymptomatic plant. Use of pesticide to control mealybug and ants is not efficient and high cost. The research was conducted to develop elimination method for PMWaV-free plant by hot water treatment and ribavirin. PMWaV infected plant (leave, stem, crown) were given two hot water treatment consisting of 35 ºC for 24 hour as pre-treatment followed immediately by hot water treatment either 56 ºC for 60 minute or 58 ºC for 40 minute in a water bath. Infected plant without hot water treatment as positive control, and healthy plant without hot water treatment as negative control. Ribavirin were added to medium culture 10 mg/l medium. PMWaV infection can be eliminated from propagative material through hot water treatment 58 ºC 40 minute in a water bath without decrease propagative material viability.
Keyword: