1,579 research outputs found
Comment and Reply Why eye movements and perceptual factors have to be controlled in studies on "representational momentum”
In order to study memory of the final position of a smoothly moving target, Hubbard (e.g., Hubbard & Bharucha, 1988) presented smooth stimulus motion and used motor responses. In contrast, Freyd (e.g., Freyd & Finke, 1984) presented implied stimulus motion and used the method of constant stimuli. The same forward error was observed in both paradigms. However, the processes underlying the error may be very different. When smooth stimulus motion is followed by smooth pursuit eye movements, the forward error is associated with asynchronous processing of retinal and extraretinal information. In the absence of eye movements, no forward displacement is observed with smooth motion. In contrast, implied motion produces a forward error even without eye movements, suggesting that observers extrapolate the next target step when successive target presentations are far apart. Finally, motor responses produce errors that are not observed with perceptual judgments, indicating that the motor system may compensate for neuronal latencie
On the structure of defects in the Fe7Mo6 -Phase
Topologically close packed phases, among them the -phase studied here,
are commonly considered as being hard and brittle due to their close packed and
complex structure. Nanoindentation enables plastic deformation and therefore
investigation of the structure of mobile defects in the -phase, which, in
contrast to grown-in defects, has not been examined yet. High resolution
transmission electron microscopy (HR-TEM) performed on samples deformed by
nanoindentation revealed stacking faults which are likely induced by plastic
deformation. These defects were compared to theoretically possible stacking
faults within the -phase building blocks, and in particular Laves phase
layers. The experimentally observed stacking faults were found resulting from
synchroshear assumed to be associated with deformation in the Laves-phase
building blocks
LHCb RICH Online-Monitor and Data-Quality
The LHCb experiment at the LHC (CERN) has been optimised for high precision measurements of the beauty quark sector. Its main objective is to precisely determine and over-constrain the parameters of the CKM mixing matrix, and to search for further sources of CP violation and new physics beyond the Standard Model in rare B-decays. Efficient particle identification at high purities over a wide momentum range from around 1 to ~100GeV/c is vital to many LHCb analyses. Central to the LHCb particle identification strategy are two Ring Imaging CHerenkov (RICH) detectors which use Silica Aerogel and C4F10 and CF4 gas radiators. A rigorous quality control scheme is being developed to insure that the data recorded by the RICH detector meets the stringent requirements of the physics analyses. The talk summarises the LHCb RICH online monitoring and data-quality strategy. Multiple dedicated algorithms are deployed to detect any potential issue already during data-taking ranging from integrity checks, mis-alignments to changes in the refractive determined from changes in the radii of Cherenkov rings found using a Markov Chain approach. A further key ingredient is the online monitoring of the particle ID performance using multiple exclusively reconstructed decay channels where the particle identity can be determined from kinematic constraints. In addition, any re-calibration of the detector can be performed using a dedicated express stream covering a dedicated data-taking period. The same tests are performed during the reconstruction phase of the full statistics of the recorded data to verify the quality of the data before made available for physics analyses
The LHCb RICH detectors
The LHCb experiment at the Large Hadron Collider has been optimised for high precision measurements of the charm and beauty quark sector. The different particle species produced in the high-energy collision are identified using two Ring-Imaging Cherenkov detectors
Enterprise AI Canvas -- Integrating Artificial Intelligence into Business
Artificial Intelligence (AI) and Machine Learning have enormous potential to
transform businesses and disrupt entire industry sectors. However, companies
wishing to integrate algorithmic decisions into their face multiple challenges:
They have to identify use-cases in which artificial intelligence can create
value, as well as decisions that can be supported or executed automatically.
Furthermore, the organization will need to be transformed to be able to
integrate AI based systems into their human work-force. Furthermore, the more
technical aspects of the underlying machine learning model have to be discussed
in terms of how they impact the various units of a business: Where do the
relevant data come from, which constraints have to be considered, how is the
quality of the data and the prediction evaluated?
The Enterprise AI canvas is designed to bring Data Scientist and business
expert together to discuss and define all relevant aspects which need to be
clarified in order to integrate AI based systems into a digital enterprise. It
consists of two parts where part one focuses on the business view and
organizational aspects, whereas part two focuses on the underlying machine
learning model and the data it uses.Comment: Accepted at "Applied Artificial Intelligence UAAI
Three-dimensional characterization of damage in dual phase steels with deep learning
Please click Additional Files below to see the full abstract
Atomistic Simulations of Basal Dislocations Interacting with MgAl Precipitates in Mg
The mechanical properties of Mg-Al alloys are greatly influenced by the
complex intermetallic phase MgAl, which is the most dominant
precipitate found in this alloy system. The interaction of basal edge and
30 dislocations with MgAl precipitates is studied by
molecular dynamics and statics simulations, varying the inter-precipitate
spacing (), and size (), shape and orientation of the precipitates. The
critical resolved shear stress to pass an array of precipitates
follows the usual proportionality. In all cases but the
smallest precipitate, the dislocations pass the obstacles by depositing
dislocation segments in the disordered interphase boundary rather than shearing
the precipitate or leaving Orowan loops in the matrix around the precipitate.
An absorbed dislocation increases the stress necessary for a second dislocation
to pass the precipitate also by absorbing dislocation segments into the
boundary. Replacing the precipitate with a void of identical size and shape
decreases the critical passing stress and work hardening contribution while an
artificially impenetrable MgAl precipitate increases both. These
insights will help improve mesoscale models of hardening by incoherent
particles.Comment: 13 pages with 9 figures and 2 tables. Supplementary materia
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