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"Penelitian ini bertujuan untuk menganalisis penggunaan strategi momentum dengan menggunakan pendekatan harga tertinggi 52 minggu terakhir dan pendekatan lainnya untuk menilai kinerja saham sehingga dapat dikelompokkan kedalam saham winner (saham dengan kinerja yang baik) atau losser (saham dengan kinerja yang buruk). Pendekatan untuk menilai kinerja saham yang digunakan pada penelitian ini adalah menggunakan tingkat return saham, tingkat return industri, rasio harga dengan harga tertinggi 52 minggu terakhir dan jangka waktu terjadinya harga tertinggi 52 minggu terakhir. Selain itu, dilakukan pula kombinasi atas pendekatan jangka waktu terjadinya harga tertinggi 52 minggu terakhir dengan ketiga strategi lainnya. Penelitian ini menggunakan sampel yaitu saham-saham pada Bursa Efek Indonesia periode 2005-2012. Hasil yang didapat adalah strategi momentum dimana membeli saham winner dan menjual saham losser hanya dapat dilakukan pada pendekatan menggunakan tingkat return industri.

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This research aims to analyze the use of momentum strategies using 52-weeks high price method and other methods to assess the performance of stocks that can be grouped into winner stocks (stocks with good performance) or losser stocks (stocks with poor performance). Methods to assess the performance of stocks used in this study is to use the level of stock return, industry return, the ratio of 52-weeks high price with recent prrice and the timing of 52-weeks high price. The combination also conducted over the timing of 52-weeks high price with 3 other methods. This research used a sample of the stocks on the Indonesia Stock Exchange period 2005-2012. The result is momentum strategy where buying winner stocks and selling losser stocks can be done using industry return method."

"This thesis wants to explore the effectiveness of momentum or contrarian strategy in Indonesian Stock Exchange using different methods in measuring the performance. The point of momentum or contrarian strategy is selecting winner (stocks with highest gain) or loser stock (stocks with highest loss) and then buy or sell it depend on the research result. This research using three methods in measuring performance used to select winner and loser stock. The first method is using cross section relative return, the second method is using cross section relative return plus risk component (return divided by standard deviation), and the third method is using historical relative return instead of cross section. The result is that, all of those three methods prove that momentum strategy is effectively applicable for winner stock, so in the next period winner stock will continue to make profit, while for loser stock, it is more effective to use contrarian strategy because in the next period, loser stock will rebound and make profit after suffering from high loss."

"ABSTRAKEqual Channel Angular Pressing (ECAP) banyak mendapat perhatian untuk pengembangan material struktur ultra fine grain. Tujuan penelitian ini adalah mempelajari pengaruh ECAP terhadap struktur mikro dan peningkatan sifat mekanik paduan Al-Mg. Pada penelitian ini die ECAP yang digunakan memiliki sudut rongga Φ=120o dan Ψ=7 o. Pengaruh rute deformasi ECAP (A, Ba, Bc, C), jumlah pass ECAP dan perlakuan annealing setelah ECAP akan di evaluasi terhadap struktur mikro dan sifat mekanik yang dihasilkan. Pengujian yang dilakukan adalah metalografi, SEM, XRD, uji keras dan uji tarik. Hasil percobaan menunjukkan bahwa dari keempat rute ECAP, rute Bc merupakan rute deformasi yang menghasilkan butiran yang relatif bulat. Hasil uji SEM menunjukkan bahwa ECAP memperkecil ukuran presipitat dan presipitat semakin mengecil seiring dengan penambahan jumlah pass ECAP. ECAP meningkatkan sifat mekanik paduan Al-Mg dan sifat mekanik semakin meningkat dengan meningkatnya jumlah pass ECAP. Annealing pada 100 dan 200ºC setelah ECAP hanya sedikit menurunkan sifat mekanik Al-Mg, tetapi cukup menaikkan elongasi. Sedangkan pada annealing 300 ºC terjadi penurunan sifat mekanik yang signifikan. Proses annealing pada 100 ºC relatif belum merubah ukuran kristalit (sub butiran), akan tetapi dengan naiknya suhu annealing (200 dan 300 ºC) ukuran kristalit semakin membesar.

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ABSTRACTEqual Channel Angular Pressing (ECAP) has received a lot of attention to the development of ultra fine grain structure material. The purpose of this research is to study the effect of ECAP on the microstructure and mechanical properties of Al-Mg alloys. In this study ECAP die having a cavity corner Φ=120o and Ψ=7 o was used. The influence of ECAP deformation route (A, Ba, Bc, C), the number of ECAP pass and annealing treatment after ECAP will be evaluated on the microstructure and mechanical properties produced . The testing was carried out by metallographic, SEM, XRD, hardness test and tensile test. The experimental results showed that among the four routes of ECAP, Bc route was a deformation route that produced relatively equi-axe grains. SEM test result showed that the ECAP reduced the size of precipitates and the precipitates become smaller with the increasing number of ECAP pass. ECAP increased the mechanical properties of Al-Mg alloys and the mechanical properties increased with the increasing number of ECAP pass. Annealing at 100 and 200 º C after ECAP decreased slightly the mechanical properties, but enough to increase elongation. Whereas, annealing at 300 º C decreased significantly the mechanical properties. Annealing at 100 º C had not change the crystallite size (sub-grain), but with increasing annealing temperature (200 and 300 º C) the crystallite sizes became larger."