Effect of Pulse Electrical Parameters on the Microstructure and Performance of Ni-TiN Nanocoatings Prepared by Pulse Electrodeposition Technique

2021 ◽  
Author(s):  
Shengjie Guo ◽  
Zhongguo Yang ◽  
Shuhui Deng ◽  
Shi Wang ◽  
Xu Wang
Keyword(s):  
Pulse Electrodeposition ◽  
Electrodeposition Technique ◽  
Electrical Parameters ◽  
And Performance ◽  
Microstructure And Performance

scholarly journals Improving the Electrical Parameters of a Photovoltaic Panel by Means of an Induced or Forced Air Stream

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
R. Mazón-Hernández ◽  
J. R. García-Cascales ◽  
F. Vera-García ◽  
A. S. Káiser ◽  
B. Zamora
Keyword(s):  
Channel Cross Section ◽  
Working Fluid ◽  
Solar Panels ◽  
Electrical Parameters ◽  
Air Velocity ◽  
Test Installation ◽  
Photovoltaic Panel ◽  
Air Stream ◽  
Forced Air ◽  
And Performance

The main priority in photovoltaic (PV) panels is the production of electricity. The transformation of solar energy into electricity depends on the operating temperature in such a way that the performance increases with the decreasing temperatures. In the existing literature, different cooling techniques can be found. The purpose of most of them is to use air or water as thermal energy carriers. This work is focused on the use of air as a working fluid whose movement is either induced by natural convection or forced by means of a fan. The aim of this study is to characterise the electrical behaviour of the solar panels in order to improve the design of photovoltaic installations placed in roof applications ensuring low operating temperatures which will correct and reverse the effects produced on efficiency by high temperature. To do this, a test installation has been constructed at the Universidad Politécnica de Cartagena in Spain. In this paper, the results of the tests carried out on two identical solar panels are included. One of them has been modified and mounted on different channels through which air flows. The different studies conducted show the effects of the air channel cross-section, the air velocity, and the panel temperature on the electrical parameters of the solar panels, such as the voltage, current, power, and performance. The results conclude that the air space between the photovoltaic panels and a steel roof must be high enough to allow the panel to be cooled and consequently to achieve higher efficiency.

Modification of microstructure and performance via doping Ti in W–1TiC fine-grained alloy

2021 ◽  
Vol 825 ◽  
pp. 141918
Author(s):  
Ziwei Zhang ◽  
Siqi Zhao ◽  
Yongqi Lv ◽  
Hongbo Zhang ◽  
Zhenwei Wang ◽  
...  
Keyword(s):  
Fine Grained ◽  
And Performance ◽  
Microstructure And Performance

scholarly journals Investigation of the Effects of Polymer Dispersants on Dispersion of GO Nanosheets in Cement Composites and Relative Microstructures/Performances

Nanomaterials ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 964 ◽  
Author(s):  
Shenghua Lv ◽  
Haoyan Hu ◽  
Yonggang Hou ◽  
Ying Lei ◽  
Li Sun ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Uniform Distribution ◽  
Methacrylic Acid ◽  
Cement Composites ◽  
Polar Groups ◽  
And Performance ◽  
Microstructure And Performance ◽  
Poly Acrylonitrile ◽  
Poly Acrylamide

This study focused on the uniform distribution of graphene oxide (GO) nanosheets in cement composites and their effect on microstructure and performance. For this, three polymer dispersants with different level of polar groups (weak, mild, and strong) poly(acrylamide-methacrylic acid) (PAM), poly(acrylonitrile-hydroxyethyl acrylate) (PAH), and poly(allylamine-acrylamide) (PAA) were used to form intercalation composites with GO nanosheets. The results indicated that GO nanosheets can exist as individual 1–2, 2–5, and 3–8 layers in GO/PAA, GO/PAH, and GO/PAM intercalation composites, respectively. The few-layered (1–2 layers) GO can be uniformly distributed in cement composites and promote the formation of regular-shaped crystals and a compact microstructure. The compressive strengths of the blank, control, GO/PAM, GO/PAH, and GO/PAA cement composites were 55.72, 78.31, 89.75, 116.82, and 128.32 MPa, respectively. Their increase ratios relative to the blank sample were 40.54%, 61.07%, 109.66%, and 130.29%, respectively. Their corresponding flexural strengths were 7.53, 10.85, 12.35, 15.97, and 17.68 MPa, respectively, which correspond to improvements of 44.09%, 64.01%, 112.09%, and 134.79%.

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