Judul: Analisis Interdependensi Indeks Saham Konvensional dan Syariah Negara-Negara Anggota OKI terhadap Kondisi Keuangan Global
Abstrak: Sistem keuangan dunia semakin terintegrasi seiring dengan melesatnya kemajuan teknologi informasi dan komunikasi. Selain berbagai dampak positif yang ditimbulkan, meluasnya jangkauan sistem keuangan juga menyebabkan pasar keuangan rentan tertular krisis yang terjadi di suatu negara. Penelitian ini bertujuan untuk menganalisis interdependensi indeks saham konvensional dan syariah negara-negara anggota Organisasi Kerjasama Islam terhadap penguatan fundamental ekonomi Amerika Serikat dan krisis lira Turki pada tahun 2018 dengan menggunakan data harga penutupan harian dari indeks saham konvensional dan syariah dari tahun 2016 hingga 2018. Penelitian ini menggunakan analisis multiscale correlation contagion test. Hasil analisis menunjukkan bahwa Malaysia dan Indonesia menjadi dua negara yang paling terpengaruh terhadap penguatan fundamental ekonomi Amerika Serikat karena hubungan perdagangan yang kuat dengan negara tersebut. Sementara itu Bahrain, Arab Saudi, Kuwait, dan Oman terkena pengaruh krisis lira Turki pada tahun 2018 akibat hubungan perdagangan terhadap Turki dan negara lain di regional Timur Tengah. Qatar menjadi satu-satunya negara yang tidak terkena pengaruh penguatan fundamental ekonomi Amerika Serikat dan krisis lira Turki karena memiliki pendapatan per kapita tertinggi di dunia.
Keyword: interdependensi, krisis, multiscale correlation contagion test

Judul: The impact of global financial crisis, world oil price changes and return volatility from global indices to sharia and conventional index in indonesia
Abstrak: Penelitian ini bertujuan untuk menganalisis volatilitas return indeks saham syariah (res_JII) dan konvensional (res_JCI) di Indonesia serta menganalisis dampak krisis keuangan global, perubahan harga minyak dunia dan volatilitas return indeks saham global terhadap volatilitas return indeks saham syariah (res_JII) dan konvensional (res_JII) di Indonesia. Data yang digunakan dalam penelitian ini adalah data harian harga minyak dunia dan indeks saham dari India, Jerman, Hong Kong, Jepang, Australia, Amerika Serikat, Singapura dan Indonesia mulai 1 Agustus 2007 sampai 31 Desember 2013. Metode analisis yang digunakan adalah kombinasi dari GARCH dan VAR. Hasil yang diperoleh adalah: (1) volatilitas return JII lebih tinggi dibanding volatilitas return JCI, tetapi pergerakan volatilitas return kedua indeks tersebut sama. (2) Guncangan krisis keuangan global lebih memberikan pengaruh yang besar terhadap volatilitas return JII dibanding volatilitas return JCI. Namun, baik volatilitas return JII maupun JCI lebih dipengaruhi oleh dirinya sendiri dan volatilitas return dari indeks saham Amerika Serikat, sedangkan perubahan harga minyak dunia tidak memberikan pengaruh yang besar terhadap volatilitas return kedua indeks saham tersebut., The objectives of this research are to analyze the return volatility from sharia (res_JII) and conventional index (res_JCI) and analyze the impact of global financial crisis, world oil price changes and return volatility from global indices to Sharia and Conventional Stock Index Return Volatility in Indonesia. This researh utilize the daily world oil price and the stock price indices from India, Germany, Hong Kong, Japan, Australia,United States, Singapore and Indonesia from August 1st2007 to December 31th 2013. The data analysis method utilize combination GARCH and VAR. The result show that: (1) JII has a higher return volatility than JCI. But, return volatility in JII and JCI have a similar movement. (2) The shock from global financial market give much effect to JII return volatility than JCI return volatility. But, the the both of JII return volatility and JCI return volatility are effected by themselves and and return volatility from United States, whereas the stock price changes don‟t give much effect to the both of stock return volatility.
Keyword: ARCH/GARCH, indeks konvensional, indeks syariah, krisis keuangan global, perubahan harga minyak dunia, volatilitas return indeks, VAR

Judul: Design of gathering-conveying unit of mobile sugar cane trash chopping machine
Abstrak: A machine for gathering and chopping the piles of sugarcane trash on the field after harvesting is being designed. As a part of the machine, a gathering-conveying unit was designed. Important data including condition and characteristics of trash were collected and used for designing the unit. The average bulk density of trash on the field was 7.7 kg/m3, the average pressure to compress the trash from 40 cm to 30 cm thickness was 50.65 N/m2, and the pressure to compress the trash from 27 cm to 8 cm thickness was 1166.60 N/m2. The unit was designed to be operated at 0.3 m/s forward speed, and having 60 cm working width. The unit was consisted of: a gathering reel, a pair of conveyors, cover-frame and power transmission components. Size and operational speed of moving components were determined by analyzing mass flow rate of the trash, and operating power of the components. The gathering reel was 100 cm in diameter and having 4 series of gathering fingers for drawing and feeding the trash into the conveyors. A pair of chain-conveyors equipped with L-shaped steel bars was set face to face on lower side and upper side for conveying and feeding the leaves to the chopping unit. The stationary test showed that the gathering reel and the conveyors could work properly. The average rotational speed of the conveyor shaft and the gathering reel were 34.03 rpm and 9.97 rpm, respectively. The working capacity of the unit was 400-500 kg/hour.
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