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Judging the working status of a gearbox through the characteristics of vibration signals was an effective fault diagnosis method. In order to improve the efficiency and reliability of vibration detection, a multi node testing system based on a microcontroller was designed and validated. The system mainly consists of signal processing equipment, signal collector, upper computer, sensors, and experimental workbench. Under different types of gear faults, the vibration signals of ten sets of gearboxes were synchronously collected and processed. In order to ensure the resolution of frequency conversion and accurately locate frequency conversion, the low-pass filtered spectrum with a filtering frequency of 1000 was verified and used to calculate the amplitude of frequency conversion. The normalization of amplitude was more conducive to feature recognition, and the frequency amplitude was proportional to its corresponding energy. According to standard spectral data and spectral analysis, wear, pitting, fracture, and bonding faults in the gearbox were identified and classified. Through the verification of three order feature spectrum, it can be seen that the accuracy of fault prediction for gearbox through vibration signals is high, which can effectively reduce maintenance and repair costs.

Prabakaran S, Rajan M, Lv C, Meng G. Int J Nanomedicine. 2020;15:8261– 8279. The Editor and Publisher of International Journal of Nanomedicine wish to retract the published article. Concerns were raised regarding alleged image duplication in Figures 9, 12 and 13, specifically: Figure 9A appears to have been duplicated with Figure 9B, with decreased magnification, yet the scale bars for each image is the same. Figure 12, panel A, HAP Day 1, appears to have been duplicated with panel C, HAP Days 7, with contrast adjustments. Figure 12, panel E, MHAP Day 1, appears to have been duplicated with panel O, MHAP/AV Days 7, with contrast adjustments. Figure 12, panel L, HAP/AV Days 14, appears to have been duplicated with panel P, MHAP/AV Days 14, with contrast adjustments. Figure 13, panel A, MT Control, appears to have been duplicated with panel C, MT 2nd week, with increased magnification, yet the scale bars for each image is the same and panel D, MT 3rd week. Figure 13, panel F, HE Control, appears to have been duplicated with panel H, HE 2nd week, and panel J, HE 4th week. The authors responded to our queries but were unable to provide a satisfactory explanation or the original data for all the figures. The Editor determined the findings of the study were no longer valid and advised for the article to be retracted. Our decision-making was informed by our policy on publishing ethics and integrity and the COPE guidelines on retraction. The retracted article will remain online to maintain the scholarly record, but it will be digitally watermarked on each page as “Retracted”. This retraction relates to this paper

This paper has been retractedSelvakani Prabakaran, 1 Mariappan Rajan, 1 Changwei Lv, 2 Guolin Meng 3 1Biomaterials in Medicinal Chemistry Laboratory, Department of Natural Products Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai 625021, India; 2Department of Orthopaedics, The Affiliated Hospital of Northwest University, Xi’an No.3 Hospital, Xi’an 710018, Mainland China; 3Orthopaedic Department of Xijing Hospital of the Fourth Military Medical University, Xi’an, Shaanxi, 710032, Mainland ChinaCorrespondence: Changwei Lv Department of OrthopaedicsThe Affiliated Hospital of Northwest University, Xi’an No.3 Hospital, Xi’an 710018, Mainland ChinaEmail lucwei76@sina.comPurpose: To develop the surface-treated metal implant with highly encouraged positive properties, including high anti-corrosiveness, bio-activeness and bio-compatibleness for orthopedic applications.Methods: In this work, the surface of commercially pure titanium (Ti) metal was treated with bio-compatible polydopamine (PD) by merely immersing the Ti plate in PD solution. The composite of trivalent lanthanide minerals (La 3+, Ce 3+ and Gd 3+)-substituted hydroxyapatite (MHAP) with Aloe vera (AV) gel was prepared and coated on the PD-Ti plate by electrophoretic deposition (EPD) method. The choice of trivalent lanthanide ions is based on their bio-compatible nature and bone-seeking properties. The formation of the PD layer, composites, and composite coatings on Ti plate and PD-Ti surface was confirmed by FT-IR, XRD, SEM and HR-TEM observations. In-vitro assessments such as osteoblasts like MG-63 cell viability, alkaline phosphatase activity and mineralization ability of the MHAP/AV composite were tested, and the composite-coated plate was implanted into a rat bone defect model for in-vivo bone regeneration studies.Results: The coating ability of the MHAP/AV composite was highly preferred to PD-treated Ti plate than an untreated Ti plate due