Onboard detection of railway axle bearing defects using envelope analysis of high frequency acoustic emission signals

AbstractRailway wheelsets consist of three main components; the wheel, axle and axle bearing. Faults can develop on any of the aforementioned components, but the most common are related to wheel and axle bearing damages. The continuous increase in train operating speeds means that failure of an axle bearing can lead to very serious derailments, potentially causing human casualties, severe disruption in the operation of the network, damage to the tracks, unnecessary costs, and loss of confidence in rail transport by the general public. The rail industry has focused on the improvement of maintenance and online condition monitoring of rolling stock to reduce the probability of failure as much as possible. This paper discusses the results of onboard acoustic emission measurements carried out on freight wagons with artificially damaged axle bearings in Long Marston, UK. Acoustic emission signal envelope analysis has been applied as a means of effective tool to detect and evaluate the damage in the bearings considered in this study. From the results obtained it is safe to conclude that acoustic emission signal envelope analysis has the capability of detecting and evaluating faulty axle bearings along with their characteristic defect frequencies in the real-world conditions

Comparison of Neuropsychological Functioning among Individuals Diagnosed with Bipolar Disorder with and without Childhood ADHD

Background: Bipolar mood disorder (BMD) with a lifetime history of Attention-deficit hyperactivity disorder (ADHD) characterized by a particularly neuropsychological profile. This study aimed to clarify whether there is a difference between BMD patients with ADHD and BMD patients without ADHD in terms of neuropsychological functioning.Methods: This is a cross-sectional study with 68 samples (24 patients had BMD with ADHD and 44 patients had BMD) selected based on the target sampling during a year (March 2014 to March 2015). Tower of London (ToL) task, Conners’ Continuous Performance Test (CPT), and Wisconsin Card Sorting Test (WCST) were used for assessing neuropsychological functioning in participants. All statistical analyses were performed using the Statistical Package for the Social Sciences (SPSS) version 16 software.Results: The results revealed that the BMD with ADHD group was not more impaired than the BMD group on two measures of executive functioning TOL and CPT. The BMD in the ADHD group was more impaired than the BMD group on WCST.Conclusion: This study will be effective in understanding whether the cognitive flexibility impairments often detected in adult BMD are partially the result of lifetime ADHD

MUSiC : a model-unspecific search for new physics in proton-proton collisions at root s=13TeV

Results of the Model Unspecific Search in CMS (MUSiC), using proton-proton collision data recorded at the LHC at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb(-1), are presented. The MUSiC analysis searches for anomalies that could be signatures of physics beyond the standard model. The analysis is based on the comparison of observed data with the standard model prediction, as determined from simulation, in several hundred final states and multiple kinematic distributions. Events containing at least one electron or muon are classified based on their final state topology, and an automated search algorithm surveys the observed data for deviations from the prediction. The sensitivity of the search is validated using multiple methods. No significant deviations from the predictions have been observed. For a wide range of final state topologies, agreement is found between the data and the standard model simulation. This analysis complements dedicated search analyses by significantly expanding the range of final states covered using a model independent approach with the largest data set to date to probe phase space regions beyond the reach of previous general searches.Peer reviewe

Measurement of prompt open-charm production cross sections in proton-proton collisions at root s=13 TeV

The production cross sections for prompt open-charm mesons in proton-proton collisions at a center-of-mass energy of 13TeV are reported. The measurement is performed using a data sample collected by the CMS experiment corresponding to an integrated luminosity of 29 nb(-1). The differential production cross sections of the D*(+/-), D-+/-, and D-0 ((D) over bar (0)) mesons are presented in ranges of transverse momentum and pseudorapidity 4 < p(T) < 100 GeV and vertical bar eta vertical bar < 2.1, respectively. The results are compared to several theoretical calculations and to previous measurements.Peer reviewe

Measurement of B-c(2S)(+) and B-c*(2S)(+) cross section ratios in proton-proton collisions at root s=13 TeV

Peer reviewe