As TREC enters its 25th year, it might seem that we’re quite far from our “adhoc search” roots, but a closer look reveals that we are pushing IR research in new and different directions by expanding the Cranfield model, not abandoning it. The TREC 2015 tracks were quite novel and presented significant challenges for participants. The Live QA track requires participants to answer open-domain que...

A subway train-steel spring floating slab track-tunnel coupling dynamic model, considering short and middle-long wavelength random track irregularities, and longitudinal connection between adjacent slabs of steel spring floating slab track, was developed. And the influence of slab length on dynamic characteristics of the system under different track conditions and train speeds are theoretically...

Track condition is one of the most important parameters affecting the track maintenance management. In order to obtain a good track maintenance management system, it is necessary to predict track condition through the time. In this study, the track’s state will be defined in terms of the Combine Track Record index (CTR) rating which can vary from 0 to 100 where 100 denotes the best possible tra...

In present study, a mathematical model of the vehicle–floating slab track (FST) interaction is established to investigate the coupled behaviour of vehicle–track system. The FST is modelled as the double Euler -Bernoulli beam including the rail and slab. The railway vehicle is simplified as a multi-rigid-body model. The wheel–rail interface is treated using a nonlinear Hertzian contact model, co...

Further insight toward the complex association and dissociation events of macromolecules requires the development of a spectroscopic technique that can track individual components, or building blocks of these macromolecules, and the complexes which they form, in real time. Three-color fluorescence cross-correlation spectroscopy (3C-FCCS) has been shown to track assemblies of three spectrally la...

The United States Navy (USN) is shifting towards condition-based maintenance (CBM) of fatigue critical dynamic components on rotorcraft, which requires more efficient methods for component identification, usage history recording, and fatigue life tracking. This paper presents a method developed by Technical Data Analysis, Inc. (TDA) to track usage and history of all uniquely serialized componen...

This paper presents an online, recursive filtering strategy for contour-based tracking. Approaching the tracking problem from an estimation perspective leads to an observer design for the visual track signal associated with an individual target in an image sequence. The track state of the observer is decomposed into group and shape components that describe the gross location and the nonrigid sh...

An analysis of mammalian cell radiation-dose survival curves, based on the linear-quadratic formalism, is shown to yield insights in the various components of damage that contribute to cell reproductive death. RBE-LET relationships of single-track lethal damage, sublethal damage, potentially lethal damage and DNA double-strand breaks are compared. Single-track lethal damage is derived to be com...