We, the Editor and Publishers of Biofuels have retracted the following article:
Yashvir Singh, Rajnish Garg & Suresh Kumar (2017) Effect of load on friction and wear characteristics of Jatropha oil bio-lubricants, Biofuels, 8:1, 125-133, DOI: 10.1080/17597269.2016.1215065
This article has been retracted due to image duplication and manipulation.
An investigation was conducted, and “worn surface image” panels in Figure 8 were found to be published in two other articles. What the images are said to represent varies by article and the authors have not been able to provide the original images. Thus, the conclusions of the present article cannot be verified.
The two other articles containing “worn surface image” panels from Figure 8 include:
Yashvir Singh, Amneesh Singla, Anshul Kumar Singh & Avani Kumar Upadhyay (2018) Tribological characterization of Pongamia pinnata oil blended bio-lubricant, Biofuels, 9:4, 523-530, DOI: 10.1080/17597269.2017.1292017 (see Figure 6(c) and 6(d), which are resized (stretched) versions of Figure 8(a) 150 N and 8(d) 150 N, respectively)
Yashvir Singh, Rajnish Garg & Ajay Kumar (2016) Tribological behavior of pongamia oil as a lubricant additive, Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 38:16, 2406-2412, DOI: 10.1080/15567036.2015.1089341 (see Figure 7(c) and 7(d), which are identical to those in reference 1, above, and correspond with the retracted article’s images in the same way)
The authors do not agree with the retraction.
We have been informed in our decision-making by our policy on publishing ethics and integrity and the COPE guidelines on retractions. The retracted article will remain online to maintain the scholarly record, but it will be digitally watermarked on each page as “Retracted”.