Judul: Analisis Kinerja Portofolio Saham Optimal Pada Indeks Sri Kehati
Abstrak: Sejak diberlakukan SID (Single Investor Identification) secara efektif pada tahun 2012, maka diketahui bahwa jumlah investor saham di Indonesia selalu mengalami peningkatan. Peningkatan investasi di pasar saham harus diimbangi dengan sikap investor yang mampu memilih kombinasi saham terbaik dengan return dan risiko yang terukur melalui portofolio optimal. Penelitian ini bertujuan untuk menentukan komposisi portofolio saham optimal pada Indeks Sri Kehati tahun 2015, 2016, 2017, 2018, 2019, dan membentuk portofolio pada periode tahun 2015-2019. Penelitian ini juga bertujuan untuk menganalisis kinerja dari portofolio yang terbentuk. Jenis dan sumber data yang digunakan dalam penelitian ini adalah data sekunder. Metode yang digunakan untuk pembentukan portofolio saham optimal adalah pendekatan single index model dan pendekatan Markowitz. Adapun metode untuk menganalisis kinerja portofolio ialah risk adjusted return. Penelitian ini menunjukkan bahwa berdasarkan hasil risk adjusted return diketahui portofolio model Markowitz dan single index model memiliki kinerja yang baik. Berdasarkan komponen penyusun portofolio optimal dengan nilai kinerja yang lebih baik maka diketahui bahwa Bank Central Asia dan Telkom memiliki kinerja yang lebih baik, sehingga Bank Central Asia dan Telkom layak dijadikan acuan dalam berinvestasi.
Keyword: Markowitz, Portofolio, Single Index Model, Sri Kehati

Judul: Penentuan Portofolio Saham Optimal pada Saham–Saham SRI KEHATI dan IHSG.
Abstrak: Melakukan diversifikasi melalui pembentukan portofolio saham akan memaksimalkan return dan meminimalkan risiko. Penelitian ini bertujuan untuk menentukan komposisi portofolio saham optimal, mengukur tingkat keuntungan dan risiko dari portofolio saham optimal serta menganalisis dan membandingkan kinerja portofolio saham optimal IHSG dan Sri-Kehati. Jenis dan sumber data yang digunakan dalam penelitian ini adalah data sekunder. Metode analisis data yang digunakan untuk pembentukan portofolio saham optimal dengan pendekatan model indeks tunggal. Selanjutnya, evaluasi kinerja portofolio saham optimal dengan pengukuran indeks treynor. Hasil penelitian menunjukkan bahwa portofolio optimal saham Sri-Kehati menghasilkan tingkat keuntungan sebesar 3.38 persen per bulan, risiko sebesar 0.50 persen per bulan dan kinerja sebesar 2.25 persen. Sedangkan portofolio optimal saham IHSG menghasilkan tingkat keuntungan sebesar 3.66% per bulan, risiko 0.67 persen per bulan dan kinerja sebesar 4.15 persen.
Keyword: optimal stock portfolio, single index model, treynor index

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
Keyword: