8 documents found, page 1 of 1

Clustering-Based Classification of Polygonal Wheels in a Railway Freight Vehicl...

Polygonal wheels are one of the most common defects in train wheels, causing a reduction in comfort levels for passengers and a higher degradation of vehicle and track components. With the aim of contributing to the safety and reliability of railway transport, this paper presents the development of an innovative methodology for classifying polygonal wheels based on a wayside system. To achieve that, a numerical...

Early identification of out-of-roundness damage wheels in railway freight vehic...

Early identification of wheel defects can prevent serious damage to railways, considerably lowering maintenance costs for both railway administrations and rolling stock operators. Within this context, an unsupervised methodology based on artificial intelligence techniques is presented, which allows the detection and classification of out-of-roundness damage wheels, such as wheel flats and polygonal wheels, base...

A strategy for out-of-roundness damage wheels identification in railway vehicle...

Wayside monitoring is a promising cost-effective alternative to predict damage in the rolling stock. The main goal of this work is to present an unsupervised methodology to identify out-of-roundness (OOR) damage wheels, such as wheel flats and polygonal wheels. This automatic damage identification algorithm is based on the vertical acceleration evaluated on the rails using a virtual wayside monitoring system an...

From Light Chain Deposition to Multiple Myeloma - Case Report and Literature Re...

Monoclonal gammopathies consist of a broad spectrum of diseases, ranging from asymptomatic monoclonal gammopathy of undetermined significance to multiple myeloma (MM). Multiple myeloma is a malignant plasma cell disorder and accounts for 10% of all hematological malignancies and 1% of all malignancies. Differential diagnosis may be challenging, considering the variety of clinical entities with similar behavior....

Characterization of Soils from North and Central Portugal for Forensic Purposes.

Estudo de inclusões fluidas num pegmatito litinífero da região de Covas do Barr...

Jazigos Filonianos Hidrotermais e Aplitopegmatíticos Espacialmente Associados a...

Antes da década de setenta do século passado a génese da grande maioria dos jazigos metálicos era interpretada como ligada ou dependente de processos magmáticos. Ou seja a génese das concentrações era interpretada como resultante da cristalização directa de um magma e/ou de fluidos hidrotermais também eles derivados de processos de diferenciação magmática (fluidos magmáticos). Hoje está estabelecido que outros ...

Micro-Raman spectroscopy of collotelinite, fusinite and macrinite

The Raman spectra and the Raman parameters have been correlated with changes in the structure of carbon materials, and most of the studies have revealed different development of the Raman spectrum. In the present study micro-Raman spectroscopy was conducted on coal bulk samples and on individual coal macerals (collotelinite, fusinite, and macrinite) from a set of Penn State Coal Bank coals of increasing rank to...