419 research outputs found
Here Comes the STRAIN: Analyzing Defensive Pass Rush in American Football with Player Tracking Data
In American football, a pass rush is an attempt by the defensive team to
disrupt the offense and prevent the quarterback (QB) from completing a pass.
Existing metrics for assessing pass rush performance are either discrete-time
quantities or based on subjective judgment. Using player tracking data, we
propose STRAIN, a novel metric for evaluating pass rushers in the National
Football League (NFL) at the continuous-time within-play level. Inspired by the
concept of strain rate in materials science, STRAIN is a simple and
interpretable means for measuring defensive pressure in football. It is a
directly-observed statistic as a function of two features: the distance between
the pass rusher and QB, and the rate at which this distance is being reduced.
Our metric possesses great predictability of pressure and stability over time.
We also fit a multilevel model for STRAIN to understand the defensive pressure
contribution of every pass rusher at the play-level. We apply our approach to
NFL data and present results for the first eight weeks of the 2021 regular
season. In particular, we provide comparisons of STRAIN for different defensive
positions and play outcomes, and rankings of the NFL's best pass rushers
according to our metric.Comment: 12 figures, 7 table
SSR™ Semi-Solid Rheocasting
Il processo IdraPrince SSR™ (Semi-Solid Rheocasting) è una nuova tecnologia sviluppata da Idraprofondamente diversa da tutti gli altri processi sviluppati precedentemente nell’area delle leghe allostato semi-solido. A differenza delle altre tecnologie il vantaggio competitivo dell’SSR™ è di utilizzareleghe commerciali secondarie quali EN 46000, senza aggravio di costi della materia prima permigliorare la qualità dei getti utilizzando macchine di pressofusione tradizionali.In questo modo la tecnologia SSR™ diventa giustificata non solo per particolari ad alta integrità prodottiin leghe primarie ma il risparmio dovuto alla riduzione del tempo ciclo, alla maggior durata degli stampie all’eliminazione totale dell’impregnazione o quanto meno una sua drastica riduzione come di certe fasidella lavorazione meccanica, giustifica economicamente l’uso dell’SSR™ con un tempo di ritornodell’investimento, in qualche caso inferiore ai 12 mesi
Commercial development of the semi-solid rheocasting (ssrtm) process
Rheocasting processes create non-dendritic, equiaxed microstructure suitable for semi-solid forming directly from liquid aluminum alloy. A new rheocasting technology that efficiently creates non-dendritic material was developed at the Massachusetts Institute of Technology in 2000 and discussed at the previous NADCA Congress in Cincinnati in 2001. In early 2002, Idra Casting Machines acquired the exclusive license from M.I.T. to develop and sell casting equipment utilizing the technology.Now known as Semi-Solid Rheocasting (SSRTM), the process has undergone development from the laboratory to a commercial machine. Designed as a retrofit for die casting machines, the rheocast machine allows die casters to not only increase part quality and make safety critical castings, but also to decrease cycle time and increase tool life. In this paper, the SSRTM station will be described in detail, and advantages of the process will be discussed
Inverse spectral problems for Sturm-Liouville operators with singular potentials
The inverse spectral problem is solved for the class of Sturm-Liouville
operators with singular real-valued potentials from the space .
The potential is recovered via the eigenvalues and the corresponding norming
constants. The reconstruction algorithm is presented and its stability proved.
Also, the set of all possible spectral data is explicitly described and the
isospectral sets are characterized.Comment: Submitted to Inverse Problem
Inverse spectral problems for Sturm--Liouville operators with matrix-valued potentials
We give a complete description of the set of spectral data (eigenvalues and
specially introduced norming constants) for Sturm--Liouville operators on the
interval with matrix-valued potentials in the Sobolev space
and suggest an algorithm reconstructing the potential from the spectral data
that is based on Krein's accelerant method.Comment: 39 pages, uses iopart.cls, iopams.sty and setstack.sty by IO
Measurement of the Partila Width and Form Factor Parameters
We have studied the decay , where . From a fit to the differential decay rate we measure the
rate normalization and form factor slope
, and, using measured values of , find . The resulting branching
fractions are and .
The form factor parameters are in agreement with those measured in decays, as predicted by heavy quark effective theory.Comment: 11 pages, postscript file also available through
http://w4.lns.cornell.edu/public/CLN
Flavor-Specific Inclusive B Decays to Charm
We have measured the branching fractions for B -> D_bar X, B -> D X, and B ->
D_bar X \ell^+ \nu, where ``B'' is an average over B^0 and B^+, ``D'' is a sum
over D^0 and D^+, and``D_bar'' is a sum over D^0_bar and D^-. From these
results and some previously measured branching fractions, we obtain Br(b -> c
c_bar s) = (21.9 3.7)%, Br(b -> s g) K^-
\pi^+) = (3.69 0.20)%. Implications for the ``B semileptonic decay
problem'' (measured branching fraction being below theoretical expectations)
are discussed. The increase in the value of Br(b -> c c_bar s) due to eliminates 40% of the discrepancy.Comment: 12 page postscript file, postscript file also available through
http://w4.lns.cornell.edu/public/CLN
Measurement of using Partila Reconstruction of
We present a measurement of the absolute branching fraction for using the reconstruction of the decay chain , where only the lepton and the low-momentum pion from
the are detected. With data collected by the CLEO II detector at the
Cornell Electron Storage Ring, we have determined .Comment: 10 page postscript file, postscript file also available through
http://w4.lns.cornell.edu/public/CLN
Search for the Decay
We have searched for the decay of the tau lepton into seven charged particles
and zero or one pi0. The data used in the search were collected with the CLEO
II detector at the Cornell Electron Storage Ring (CESR) and correspond to an
integrated luminosity of 4.61 fb^(-1). No evidence for a signal is found.
Assuming all the charged particles are pions, we set an upper limit on the
branching fraction, B(tau- -> 4pi- 3pi+ (pi0) nu_tau) < 2.4 x 10^(-6) at the
90% confidence level. This limit represents a significant improvement over the
previous limit.Comment: 9 page postscript file, postscript file also available through
http://w4.lns.cornell.edu/public/CLN
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