Reflective thinking is known as assessing what they know, what they need to know, and how they bridge that gap during learning situations. Relating what students knew with what they learn today is not easy, sometimes they forget or just cannot make a connection between it. This study will analyze how the students actively participating in reflective thinking by creating project-based learning on statistics lesson based on design research. Thirty-nine engineering students, in a group of four, were asked to make their own data, analyze and transfer it into a poster to inform the readers about the use of statistics in daily life. This study used the measurement of reflective thinking scales by Kember to analyze students answer through the worksheet and instructional activity. The instructional activity succeeds to reveals students thinking of all four skills; habitual action, understanding, reflection, and critical reflection. Furthermore, it also discovered the misuse of some terms when used in daily life.

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Turbin angin memanfaatkan energi kinetik dari angin dan kemudian mengkonversinya menjadi energi listrik. Ada dua tipe turbin angin yaitu Turbin Angin dengan Sumbu Horizontal (TASH) dan Turbin Angin dengan Sumbu Vertical (TASV). Turbin Angin Sumbu Horisontal adalah jenis turbin angin dimana sumbu rotasi turbin nya diorientasikan secara sejajar dengan arah angin agar menghasilkan power. Sedangkan Turbin Angin Sumbu Vertikal adalah jenis turbin angin dimana sumbu rotasi turbin ini tegak lurus dengan arah angin atau permukaan pemasangan. Dalam penelitian ini dilakukan perancangan Simulasi Turbin Angin Sumbu Horizontal (TASH) dengan memvariasikan jumlah blade 3, 4, 5, 6, sudut pitch 0°, 6°, 10° dan variasi kecepatan angin serta menganalisis performance yang dihasilkan oleh turbin angin tersebut dengan parameter Power, Torque dan Thrust. Berdasarkan perancangan dan analisis yang dilaksanakan, diperoleh kesimpulan bahwa nilai power paling besar pada turbin dengan jumlah 3 blade, sudut 6° yaitu sebesar 2837 watt saat kecepatan angin 20 m/s dan 1401,00 rpm. Nilai rotor torque terbesar pada turbin dengan jumlah 6 blade, sudut pitch 0° yaitu sebesar 34,5 Nm pada kecepatan angin 20 m/s dan kecepatan rotasi 601,00 rpm. Nilai thrust terbesar dihasilkan oleh turbin angin dengan jumlah 6 blade, sudut 10° yaitu sebesar 363,11 N ketika kecepatan angin 20 m/s dan kecepatan rotasi 1401,00 rpm. Penelitian ini juga melakukan pengujian pada kecepatan angin rata-rata di Indonesia yaitu dengan kecepatan 12 m/s dan kecepatan rotasi 300 rpm, diperoleh turbin angin paling efesien adalah dengan jumah blade 6 dengan menghasilkan power 332,383 watt, rotor torque 610,545 Nm dan thrust 57,582 N.

There are many variation of Gauss-Jordan Calculator. Students can use it to solve various types of linear equations.  But all of them just straightly show the result. There is no such calculator which shows the step by step to get the result. Therefore, the students cannot understand how to do Gauss-Jordan Elimination. One program that can be developed to make Gauss-Jordan calculator is matlab. This article examines matlab program which can help students to understand Gauss-Jordan Elimination methods. It tends to focus on the process to get solution. This program reveals with the step by step of operation in Gauss-Jordan to make reduced row-echelon form. Numbers of operations drawn in the solutions of linear simultaneous equations have also been showed. This paper has a propensity to appraise the performance of matlab program in solving linear equation problems with n variables while showing every steps of Gauss-Jordan Elimination. Further it has the potential to develop this program to be a calculator that can be access without opening matlab.