Judul: Optimasi Portofolio Obligasi Korporasi Syariah Ijarah dan  Konvensional di Bursa Efek Indonesia
Abstrak: Obligasi syariah sedang mengalami pertumbuhan yang berkesinambungan di Pasar Modal Indonesia, akan tetapi kenyataan menunjukkan bahwa penerbitan obligasi syariah di Indonesia lebih kecil bila dibandingkan dengan obligasi konvensional. Hal ini berkaitan dengan berbagai macam faktor, salah satunya kinerja obligasi syariah tersebut, maka perlu dilakukan penelitian mengenai obligasi syariah khususnya Ijarah dan obligasi konvensional dilihat dari sisi return, risiko dan kinerja sharpe index-nya (level competitiveness). Penelitian ini bertujuan mengetahui penyebab kecilnya jumlah penerbitan salah satunya dengan menghitung kinerja dari masing-masing obligasi dan membandingkan kinerja dari portofolio obligasi syariah dengan portofolio obligasi konvensional. Penelitian ini menggunakan data sekunder yang diambil dari data bulanan yang dipublikasikan oleh Indonesia Capital Market Electronic Library (iCAMEL) Bursa Efek Indonesia dari periode Juli 2008 – Desember 2012. Optimasi merupakan proses untuk menemukan solusi terbaik dengan menggunakan prosedur sistematis. Optimasi portofolio dalam penelitian ini menggunakan metode Single Index Model. Penggunaan Single Index Model (SIM) dalam membuat portofolio optimal berdasarkan nilai Excess Return to Beta (ERB) untuk setiap kandidat portofolio obligasi menghasilkan portofolio dengan return cukup baik. ERB memiliki kelebihan karena mempertimbangkan systematic risk dari setiap obligasi yang diukur, yaitu dengan menghitung nilai beta. Hasil akhir dari uji beda dalam pembuktian hipotesis menunjukkan bahwa obligasi syariah dan obligasi konvensional tidak mempunyai perbedaan yang nyata (significant) di dalam return atau tingkat pengembaliannya, risiko dan kinerja sharpe ratio, maka para investor tidak perlu lagi ragu dalam menanamkan dananya pada obligasi syariah. Dan perusahaan seharusnya tidak perlu ragu menerbitkan obligasi syariah. Secara rataan obligasi konvensional memang memberikan hasil lebih tinggi, untuk rataan tingkat risiko obligasi konvensional mempunyai nilai lebih tinggi. Hal ini sesuai dengan hukum high risk high return. Sehingga obligasi syariah ijarah tepat untuk investor dengan tipe risk averter. Hasil akhir dari uji kebebasan sampel (uji-t) terhadap penilaian kinerja (sharpe ratio) pada portofolio obligasi syariah ijarah dengan obligasi konvensional dari perusahaan yang sama menunjukkan perbedaan yang nyata, namun tidak terdapat perbedaan nyata pada penilaian kinerja sharpe ratio portofolio obligasi korporasi syariah ijarah dengan obligasi korporasi konvensional dari perusahaan yang berbeda. Beberapa solusi untuk meningkatkan jumlah penerbitan obligasi syariah adalah meningkatkan pemahaman para pelaku pasar dengan mempromosikan obligasi syariah secara intensif, dan menyediakan sumber daya manusia berkualitas dengan latihan dan pendidikan secara komprehensif
Keyword: Portofolio, Obligasi Korporasi Syariah Ijarah dan Konvensional, Single Index Model (SIM)

Judul: Analisis Perbandingan Kinerja Obligasi Syariah dan Obligasi Konvensional di Bursa Efek Indonesia Periode 2010-2013
Abstrak: This research was done to provide the comparison of performance between syariah bonds and conventional bonds based on Yield to Maturity (YTM) and deviation standard. Beside those methods, the performance of both in the kinds of bonds was also measured by Sharpe method so it is expected that this research can give positive contribution toward investor. The research used the descriptive analysis and independent sample t-test analysis that was formulated by using SPSS. The results of the analysis shows that there is no significant difference between syariah bonds and conventional bonds based on the value of YTM, deviation standard, and Sharpe index. In the other hand, descriptively the conventional bonds has better performance compared to islamic Bonds. The result shows that on the conventional bonds, the value of YTM is 9.72%, the deviation standard is 0.92%, and the Sharpe Index is 2.74. While on the syariah bonds, the result shows that the value of YTM is 9.45%, the deviation standard is 0.99% and the Sharpe index is 2.23.
Keyword: YTM, syariah bonds, sharpe method, deviation standar, conventional bonds

Judul: Thermal Characteristics and Dynamics of Tropical Cyclone over Western North Pacific Ocean: A Case Study of Typhoon Songda (Chedeng) 2011
Abstrak: The frequent occasion of Tropical Cyclone (TC) over Western North Pacific (WNP) Ocean lies from 10˚N to 26˚N and 121˚E to 170˚E. Sources of TC development come from warm ocean temperature where latent heat is released during condensation processes and subsequently concentrated in the boundary layer. Relative humidity at 850-700 hPa is responsible to produce the most intense storm. Meanwhile, weak vertical wind shear between 850-200 hPa is one of the dynamical factors that lead to the development of TC. Pressure level of 850-200 hPa is chosen to minimize the thermodynamic effect in the lower troposphere. Typhoon Songda (Chedeng in the Philippines) or TSC lasted from May 18th to 30th, 2011 and strengthened into powerful Super Typhoon stage between May 24th and 27th. Long curving track and the exhibition of all sequences of TC life cycle, TSC is then considered as an ideal case of TC. The objective of the study with case of TSC is to investigate the role of thermal characteristics and dynamics on TC intensity. The research is carried out by using Advanced Research of Weather Research and Forecasting model (WRF ARW model) version 3.3. Two domains are employed in the model. The first domain situate from 02˚N to 40˚N and 118˚E to 149˚E and cover spatial resolution () of 33.1 km. The second domain situate from 09˚N to 27˚N and 119˚E to 132˚E with of 11 km. Timestep of the model () is 120 seconds. The model is supported by the following physical parameterization, i.e., Yonsei University Scheme (YSU) in the boundary layer, Kain-Fritsch scheme (KF) in the cumulus, and WRF Single-Moment 3-class scheme in the microphysics. Initial meteorological condition prior to the formation of the cyclone is generated using WRF ARW standard-release model. Sensitivity of the model output is obtained from a selected single-parameter change scenarios, namely, 10 % to 20 % decrease and increase of wind shear initial data at 850-200 hPa, and by 10 % to 20 % decrease of relative humidity initial data at 850-700 hPa. The result showed that the negative correlations between wind shear and intensity are found in wind shear scenarios. Wind shears of 10 ms-1 which lead to strengthening of the wind intensity in the early period of Typhoon development are found in wind shear scenarios. The effect of wind shear changes on wind intensity is statistically significant in the 20 % wind shear scenarios. During mature stage, weak wind intensity occurred when wind shear increase as given in the WRF standard-release and the 20 % decreasing scenario. Different situation is found in the 20 % increasing scenario where wind shear tend to weak and lead to strong wind intensity at this stage. Meanwhile, the reduction of moisture supply at 850-700 hPa resulting from 20 % decreasing relative humidity play a major role in the weakening of wind intensity and reduces mechanical energy of the cycle process as much as 300 J kg-1.
Keyword: