One alternative energy that is easy and can be used is wind. This energy is utilized through wind turbines which have two general types, namely horizontal and vertical axis wind turbines. This wind turbine can move by utilizing the energy available in the wind to rotate the turbine. The problem with wind turbines is self-starting is difficult to achieve. This can be caused by several factors, such as slow wind speed and erratic wind direction. In addition, wind turbines also have low-efficiency values. Therefore, our contribution to this research is to design a blade controller on a vertical axis wind turbine. This blade control is designed by utilizing the pitch angle by using actuators that are applied to each blade based on the Proportional, Integral & Derivative (PID) algorithm. The PID algorithm is used to find the appropriate pitch angle value on a vertical axis wind turbine. The effect of the pitch angle on the wind turbine serves to maintain the mechanical power value by the available power in the wind. This research was conducted using a simulation method (MATLAB). In this study, it was found that this wind energy conversion simulation produces maximum mechanical power when the wind speed varies is 1723 Watt and when the wind speed is 7 m/s, mechanical power achieved is 362.595 Watt.

Transmission control protocol (TCP) employs acknowledgement (TCP-ACK) for every transmitted packets to ensure reliable transmission. As a result, it sends the next window packets after receiving the TCP-ACK packet of previous window. This means that the earlier the TCP-ACK packet arrives, the faster the TCP next window transmission and the better the TCP performances. To do so, there should be a special treatment to the transmitted TCP-ACK to fasten next window transmission. This paper proposes a collision probability reduction for the transmitted TCP-ACK packets so that the overall TCP delay reduces. Collision probability reduction can be implemented in many ways. Initially, mathematical analysis is provided to prove that method can work as expected. The mathematic analysis shows that when TCP-ACK collision probability is reduced, the overall TCP delay is also reduced. The proposed method is then implemented in 802.11, 802.16 and complex networks. The NS-2 simulations evaluations for the aforementioned networks and the proposed method proved that collision reductions on TCP-ACK exert average TCP delay reductions about 11.86%, 28.04% and 9.46% subsequently<em>.</em>The proposed method is also applicable for other TCP types.

Kegiatan Pengabdian kepada Masyarakat Terintegrasi Lembaga Penelitian dan Pengabdian kepada Masyarakat (LPPM) Universitas Riau merupakan kegiatan Pengabdian kepada Masyarakat dosen yang dijalankan secara bersamaan dengan kegiatan Kuliah Kerja Nyata (KUKERTA) mahasiswa. Kegiatan pengabdian ini dirancang berdasarkan kebutuhan masyarakat lokasi Kukerta. Kegiatan pengabdian kali ini berupa penerapan ilmu pengetahuan dan teknologi dengan merancang sebuah alat Sistem Smart Monitoring Kualitas Air berbasiskan internet of thing (IoT) di Kelurahan Tirta Siak, Payung Sekaki, Pekanbaru. Alat ini mengubah cara pengujian air baku yang konvensional yang biasanya dilakukan dengan cara membawa sampel ke laboratorium. Sistem Smart Monitoring Kualitas Air Sungai ini menguji sampel air dengan meletakkan sensor kekeruhan dan pH di lokasi yang ditentukan, kemudian data diproses oleh Arduino Mega 2560 untuk melakukan pembacaan nilai parameter pH dan kekeruhan air sungai, nilai yang didapat dari proses pengukuran tersebut dikonversikan dari bentuk analog ke bentuk digital untuk ditampilkan ke antar muka berupa website. Dengan adanya alat ini diharapkan kualitas air Sungai Siak di titik lokasi dimana alat dipasang dapat terpantau. Sehingga dengan adanya pemantauan secara langsung dengan data real time ini dapat pula merubah perilaku masyarakat terutama masyarakat Pekanbaru terhadap kualitas air Sungai Siak dengan demikian kebersamaan masyarakat dalam menjaga kualitas lingkungan akan terbangun.