2,403 research outputs found
Unveiling the Proton Spin Decomposition at a Future Electron-Ion Collider
We present a detailed assessment of how well a future Electron-Ion Collider
could constrain helicity parton distributions in the nucleon and, therefore,
unveil the role of the intrinsic spin of quarks and gluons in the proton's spin
budget. Any remaining deficit in this decomposition will provide the best
indirect constraint on the contribution due to the total orbital angular
momenta of quarks and gluons. Specifically, all our studies are performed in
the context of global QCD analyses based on realistic pseudo-data and in the
light of the most recent data obtained from polarized proton-proton collisions
at BNL-RHIC that have provided evidence for a significant gluon polarization in
the accessible, albeit limited range of momentum fractions. We also present
projections on what can be achieved on the gluon's helicity distribution by the
end of BNL-RHIC operations. All estimates of current and projected
uncertainties are performed with the robust Lagrange multiplier technique.Comment: 12 pages, 8 eps figure
Functional description of a command and control language tutor
The status of an ongoing project to explore the application of Intelligent Tutoring System (ITS) technology to NASA command and control languages is described. The primary objective of the current phase of the project is to develop a user interface for an ITS to assist NASA control center personnel in learning Systems Test and Operations Language (STOL). Although this ITS will be developed for Gamma Ray Observatory operators, it will be designed with sufficient flexibility so that its modules may serve as an ITS for other control languages such as the User Interface Language (UIL). The focus of this phase is to develop at least one other form of STOL representation to complement the operational STOL interface. Such an alternative representation would be adaptively employed during the tutoring session to facilitate the learning process. This is a key feature of this ITS which distinguishes it from a simulator that is only capable of representing the operational environment
Introduction: The mobile landscape of post-war architectural thought
Around 1908, the German sociologist Georg Simmel reflected on the significance of mobility
infrastructures, such as paths and bridges. These divisions of space, he wrote, were more than
physical facts. They resulted from a subjective understanding of space, namely the human
will to link distinct elements. Boundaries, paths and bridges were creations of a human being,
the ‘connecting creature who must always separate and who cannot connect without
separating’. Simmel called this double act of separation and connection, resulting in a
dynamic intertwining of physical place and mental spaces, the ‘miracle of the road’ (Simmel
[1909] in Leach 1997: 64–7).info:eu-repo/semantics/acceptedVersio
Auswirkungen der Sortenmischungsstrategie auf Backqualität,Ertrag und Krankheitsbefall im Winterweizen
Ziel der Arbeit ist es, die Auswirkungen von Sortenmischungen bei unterschiedlicher Nährstoffversorgung auf Backqualität, Ertrag und Krankheitsbefall im Ökologischen Landbau zu überprüfen.
Die Ergebnisse der Versuche legen nahe, daß Interaktionen zwischen Standortbedingungen, Jahr und Sorte sehr groß sind aber insgesamt die Mischungen die Backqualität nicht beeinträchtigen. Die Datenbasis ist aber für die Formulierung von Empfehlungen nicht
breit genug. Um den Einfluß von Standortfaktoren und Mischungen auf Krankheitsbefall, v.a. Fusariosen, Backqualität und Mykotoxin-belastung zu quantifizieren wurden für 2002/2003 Praxisversuche an 12 Standorten mit Reinbeständen und Mischungen angelegt
Interactive time series analytics powered by ONEX
Modern applications in this digital age collect a staggering amount of time series data from economic growth rates to electrical household consumption habits. To make sense of it, domain analysts interactively sift through these time series collections in search of critical relationships between and recurring patterns within these time series. The ONEX (Online Exploration of Time Series) system supports effective exploratory analysis of time series collections composed of heterogeneous, variable-length and misaligned time series using robust alignment dynamic time warping (DTW) methods. To assure real-time responsiveness even for these complex and compute-intensive analytics, ONEX precomputes and then encodes time series relationships based on the inexpensive-to-compute Euclidean distance into the ONEX base. Thereafter, based on a solid formal foundation, ONEX uses DTW-enhanced analytics to correctly extract relevant time series matches on this Euclidean-prepared ONEX base. Our live interactive demonstration shows how our ONEX exploratory tool, supported by a rich array of visual interactions and expressive visualizations, enables efficient mining and interpretation of the MATTERS real data collection composed of economic, social, and education data trends across the fifty American states. © 2017 ACM
Loop Bifurcation and Magnetization Rotation in Exchange Biased Ni/FeF2
Exchange biased Ni/ FeF2 films have been investigated using vector coil
vibrating sample magnetometry as a function of the cooling field strength H_FC.
In films with epitaxial FeF2, a loop bifurcation develops with increasing H_FC
as it divides into two sub-loops shifted oppositely from zero field by the same
amount. The positively biased sub-loop grows in size with H_FC until only a
single positively shifted loop is found. Throughout this process, the
negative/positive (sub)loop shift has maintained the same discrete value. This
is in sharp contrast to films with twinned FeF2 where the exchange field
gradually changes with increasing H_FC. The transverse magnetization shows
clear correlations with the longitudinal sub-loops. Interestingly, over 85% of
the Ni reverses its magnetization by rotation, either in one step or through
two successive rotations. These results are due to the single crystal nature of
the antiferromagnetic FeF2, which breaks down into two opposite regions of
large domains.Comment: 16 pages, 3 figures, to appear in PR
- …