Based on the results of the preliminary survey conducted along Towua roads there are some and the stock as exfoliation layers the surface of , the release of grains , split open and crack. So as to cause a lack of security and comfort for road users. The purpose of the study to identify a kind of , the level of , and the percentage of road damage priority value on roads towua and the factors causing the damage occurs and apply the method or the treatment of defects that occurred on Towua roads. The methods used in analyze the research by using the Bina Marga methods and testing in the laboratory to examine 3 bricket sample taken at 3 location points, in their respective STA : KM 00 + 300, STA : KM 00 + 500, and STA : KM 00 + 800. Based on the result of damage analysis on Towua Road, the percentage of total damage was 42,349% or 7020,617 M² from the total area of Towua Road with priority value...........

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The aim of this study is to simulate the closed loop controlled DC-DC converter for stand-alone wind energy system for different controllers. Wind turbines, are not always very efficient in the wind speeds that are most common to a region. Typically, wind energy systems are designed to be highly efficient in high wind speed and have a cut-off wind speed- below which no energy is captured. Therefore, for the efficient capture of wind power, turbine speed should be controlled to follow the ideal TSR, with an optimal operating point, which is different for every wind speed. The LCL-T resonant inverter system for closed loop DC-to-DC converter systems are simulated using MATLAB Simulink power system blocks for different controllers. This converter has advantages like reduced transformer size, reduced filter size and current source characteristics. The simulation studies indicate that LCL-T type for closed loop DC-DC converter can be used with stand-alone wind generator. Constant voltage can be maintained at the output of DC-to-DC converter by using a PWM rectifier at the output.

[1]. Annamalai M. and Vijayakumar M., "LCL -T Resonant DC-DC Converter for standalone wind energy system", International Journal of Engineering Research and Industrial Applications (IJERIA)" Pune – 32, Vol. 2, No.III pp. 115–124, 2009.
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This investigation sheds a light on the effect of Ni addition to the conventional cast Al-Si-Fe-B alloy. The mentioned alloy was prepared with a nominal composition Al- 20 wt% Si- 9 wt% Fe- 1.2 wt% B by means of normal casting process once. Through the same process Al-20 wt% Si- 9 wt% Fe- 1.2 wt% B- 6 wt% Ni was also prepared in order to study the influence of Ni addition on the morphology and mechanical properties of as-cast Al-Si-Fe-B alloy. The microstructure of tested samples was synthesised using optical microscopy (OM), and the mechanical properties were analysed by Vickers microhardness test technique. It is observed that the resulted phase constitutions of Al-Si-Fe-B alloy are primary Si, δ-Al₄ (Fe,B)Si₂ intermetallic compounds and α-Al matrix, while the four phases structure of Al-Si-Fe-B-Ni alloy is composed of β- Al₅ (Fe,Ni,B)Si, δ-Al₄ (Fe,Ni,B)Si₂ , primary Si and α-Al. The higher value of measured hardness for Al-Si-Fe- B alloy is 179 Hv, which is significantly larger than that of Al-Si-Fe-B-Ni alloy (161Hv).

[1]. Enhanced thermal stability of a quasicrystalline phase in rapidly solidified Al-Mn-Fe-X alloys. K. Stan-Głowi, L. Lity, J. Morgiel, A. Goral, M.A. Gordillo, J.M. Wiezorek. Journal of Alloys and Compounds 702 (2017) 216e228.
[2]. Fatigue properties improvement of high-strength aluminum alloy by using a ZrCu-based metallic glass thin film coating. P.H. Tsai, J.B. Li, Y.Z. Chang, H.C. Lin, J.S.C. Jang, J.P. Chu, J.W. Lee, P.K. Liaw. Thin Solid Films xxx (2013).
[3]. The effects of Cr and Zr addition on the microstructure and mechanical properties of rapidly solidified Al-20Si- 5Fe alloys. S.J. Hong, T.S. Kim, W.T. Kim, B.S. Chun. Materials Science and Engineering A226-228 (1997) 878482.
[4]. Study on Influences of Addition of Alloying Elements on Properties of Aluminium – Silicon Alloys: A Review. Mr. G. B. Jambukar, Prof. Dr. Y. R. Kharde. Vol. 3, Issue 1, January -February 2013, pp.1808-1813.
[5]. Influence of Heat Treatment on the Mechanical Properties of Aluminium Alloys (6xxx Series):A Literature Review. Krishna Pal Singh Chauhan. ISSN: 2278-0181, Vol. 6 Issue 03, March-2017.