899 research outputs found
Quasi-monotonic segmentation of state variable behavior for reactive control
Real-world agents must react to changing conditions as they execute planned tasks. Conditions are typically monitored through time series representing state variables. While some predicates on these times series only consider one measure at a time, other predicates, sometimes called episodic predicates, consider sets of measures. We consider a special class of episodic predicates based on segmentation of the the measures into quasi-monotonic intervals where each interval is either quasi-increasing, quasi-decreasing, or quasi-flat. While being scale-based, this approach is also computational efficient and results can be computed exactly without need for approximation algorithms. Our approach is compared to linear spline and regression analysis
Pauline Spiritual Warfare: How a Warfare Mentality Shaped Paulâs Approach to Missions
Paulâs understanding of the condition of nonbelievers and his understanding of how Satan attacks believers is explained in this article. In support of this effort the biblical data is examined and lessons arising from the Pauline corpus in relation to these two issues are noted. Paulâs perspective on these two issues is explored as it relates to his missiological practice. The article, then, concludes with some contemporary applications of this study as they affect current missiological practices
Book Review: Christianity Encountering World Religions: The Practice of Mission in the Twenty-First Century by Terry Muck and Frances S. Adeney
Pauline Spiritual Warfare: How a Warfare Mentality Shaped Paulâs Approach to Missions
Paulâs understanding of the condition of nonbelievers and his understanding of how Satan attacks believers is explained in this article. In support of this effort the biblical data is examined and lessons arising from the Pauline corpus in relation to these two issues are noted. Paulâs perspective on these two issues is explored as it relates to his missiological practice. The article, then, concludes with some contemporary applications of this study as they affect current missiological practices
Studies of Hadronization Mechanisms using Pion Electroproduction in Deep Inelastic Scattering from Nuclei
Atomic nuclei can be used as spatial analyzers of the hadronization process
in semi-inclusive deep inelastic scattering. The study of this process using
fully-identified final state hadrons began with the HERMES program in the late
1990s, and is now continuing at Jefferson Lab. In the measurement described
here, electrons and positive pions were measured from a 5 GeV electron beam
incident on targets of liquid deuterium, C, Fe, and Pb using CLAS in Hall B.
The broadening of the transverse momentum of positive pions has been studied in
detail as a function of multiple kinematic variables, and interpreted in terms
of the transport of the struck quark through the nuclear systems. New insights
are being obtained into the hadronization process from these studies; and
experiments of this type can be relevant for the interpretation of jet
quenching and proton-nucleus collisions at RHIC and LHC. These measurements
will be extended in the next few years with the approved JLab experiment
E12-06-117, and later at a future Electron-Ion Collider.Comment: 3 pages, 2 figures; proceedings of the 19th Particles & Nuclei
International Conference (PANIC), 2011, with one updated figur
Studies of Parton Propagation and Hadron Formation in the Space-Time Domain
Over the past decade, new data from HERMES, Jefferson Lab, Fermilab, and RHIC
that connect to parton propagation and hadron formation have become available.
Semi-inclusive DIS on nuclei, the Drell-Yan reaction, and heavy-ion collisions
all bring different kinds of information on parton propagation within a medium,
while the most direct information on hadron formation comes from the DIS data.
Over the next decade one can hope to begin to understand these data within a
unified picture. We briefly survey the most relevant data and the common
elements of the physics picture, then highlight the new Jefferson Lab data, and
close with a prospective for the future.Comment: Invited talk delivered at the Sixth International Conference on
Perspectives in Hadronic Physics, ICTP, Trieste, Italy, 12-16 May 2008. 8
pages, 5 figure
Flexibility defines structure in crystals of amphiphilic DNA nanostars.
DNA nanostructures with programmable shape and interactions can be used as building blocks for the self-assembly of crystalline materials with prescribed nanoscale features, holding a vast technological potential. Structural rigidity and bond directionality have been recognised as key design features for DNA motifs to sustain long-range order in 3D, but the practical challenges associated with prescribing building-block geometry with sufficient accuracy have limited the variety of available designs. We have recently introduced a novel platform for the one-pot preparation of crystalline DNA frameworks supported by a combination of Watson-Crick base pairing and hydrophobic forces (Brady et al 2017 Nano Lett. 17 3276-81). Here we use small angle x-ray scattering and coarse-grained molecular simulations to demonstrate that, as opposed to available all-DNA approaches, amphiphilic motifs do not rely on structural rigidity to support long-range order. Instead, the flexibility of amphiphilic DNA building-blocks is a crucial feature for successful crystallisation
MOCVD of Cd(1-x)Zn(x)S/CdTe PV cells using an ultra-thin absorber layer
Ultra-thin Cd(â â â)Zn(â)S/CdTe devices were produced by atmospheric pressure metal organic chemical vapour deposition (AP-MOCVD) with varying CdTe absorber thicknesses ranging from 1.0 to 0.2 mm and compared to baseline cells with total CdTe thickness of 2.25ÎŒ. The ultra-thin CdTe layers (â€1 ÎŒm) were intentionally doped with As to induce p-type conductivity in the absorber. Cell performance reduced with CdTe thickness, with the magnitude of photo-current generation loss becoming more significant for the very thin CdTe layers. The decline in cell performance was lower than the optically limited performance relating to a decrease in shunt resistance, Rsh, especially for the thinnest cells due to areas of incomplete CdTe coverage and large presence of pin-holes leading to micro-shorts. Incorporation of Zn into the CdS window layer improved cell performance for all devices except when 0.2 ÎŒm thick CdTe was used. This improvement was markedly in the blue region owing to enhanced optical transparency of the window layer. External quantum efficiency (EQE) measurements showed a red-shift of the window layer absorption edge due to leaching out of Zn during the CdClâ treatment. Reduction of the CdClâ deposition time was demonstrated to recover the blue response of the ultra-thin cells
Unbiased clustering estimates with the DESI fibre assignment
The Emission Line Galaxy survey made by the Dark Energy Spectroscopic
Instrument (DESI) survey will be created from five passes of the instrument on
the sky. On each pass, the constrained mobility of the ends of the fibres in
the DESI focal plane means that the angular-distribution of targets that can be
observed is limited. Thus, the clustering of samples constructed using a
limited number of passes will be strongly affected by missing targets. In two
recent papers, we showed how the effect of missing galaxies can be corrected
when calculating the correlation function using a weighting scheme for pairs.
Using mock galaxy catalogues we now show that this method provides an unbiased
estimator of the true correlation function for the DESI survey after any number
of passes. We use multiple mocks to determine the expected errors given one to
four passes, compared to an idealised survey observing an equivalent number of
randomly selected targets. On BAO scales, we find that the error is a factor 2
worse after one pass, but that after three or more passes, the errors are very
similar. Thus we find that the fibre assignment strategy enforced by the design
of DESI will not affect the cosmological measurements to be made by the survey,
and can be removed as a potential risk for this experiment.Comment: 11 pages, 8 figure
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