Filters








38,796 Hits in 6.1 sec

Measurement of an accelerator based mixed field with a Timepix detector

S.P. George, C.T. Severino, E. Fröjdh, F. Murtas, M. Silari
2015 Journal of Instrumentation  
The Timepix is an active array of 65K energy measuring pixels which allows visualization and energy measurement of the tracks created by individual particles.  ...  Morphological track categories are found to possess overlapping LET and energy spectra, however the approaches are found to be complementary with morphological clustering yielding information which is  ...  This research project has been supported by the Marie Curie Initial Training Network Fellowship of the European Community's Seventh Framework Programme under Gran Agreement PITN-GA-4 2011-289198-ARDENT  ... 
doi:10.1088/1748-0221/10/03/p03005 fatcat:kmgili3iunf3hn7dtpneqhp3jq

A geometric invariant-based framework for the analysis of protein conformational space

A. V. Tendulkar, M. A. Sohoni, B. Ogunnaike, P. P. Wangikar
2005 Bioinformatics  
Results: We first map the local conformations in a fixed dimensional space by using a carefully selected suite of geometric invariants (GI's) and then reduce the number of dimensions via principal component  ...  Clustering of the available conformations reveals that the number of preferred local conformations is several orders of magnitude smaller than that suggested previously.  ...  They describe the backbone structure of an n-mer peptide by a set of 2n dihedral angles (i.e. the and angles).  ... 
doi:10.1093/bioinformatics/bti621 pmid:16096349 fatcat:w4terrl75bgepiqitkdjahvpou

Clustering in $^{18}$O - absolute determination of branching ratios via high-resolution particle spectroscopy

Stuart Pirrie, Carl Wheldon, Tzany Kokalova, Jack Bishop, R. Hertenberger, H.-F. Wirth, Stephanie Bailey, Neil Curtis, Daniele Dell'Aquila, Thomas Faestermann, D. Mengoni, Robin Smith (+2 others)
2020 SciPost Physics Proceedings  
in geometric efficiencies due to population of bound excited levels in daughter nuclei.  ...  states in light nuclei is an important and useful tool for probing the underlying nuclear structure of individual resonances: for example, in establishing the tendency of an excited state towards \alphaα-cluster  ...  By plotting the known quantity E beam − E A − E p against the calculated quantity p 2 B 2 , a locus demonstrating a linear relationship is obtained with gradient 1 m B and y-intercept −Q 3 if the assumption  ... 
doi:10.21468/scipostphysproc.3.009 fatcat:d25w5ypo5jblla7ej5jur67lkm

Clustering in ^18O – absolute determination of branching ratios via high-resolution particle spectroscopy [article]

S. Pirrie, C. Wheldon, Tz. Kokalova, J. Bishop, R. Hertenberger, H.-F. Wirth, S. Bailey, N. Curtis, D. Dell'Aquila, Th. Faestermann, D. Mengoni, R. Smith (+2 others)
2019 arXiv   pre-print
Difficulty arises in measuring these branching ratios due to similarities in available decay channels, such as (^18O,n) and (^18O,2n), as well as differences in geometric efficiencies due to population  ...  high-energy states in light nuclei is an important and useful tool for probing the underlying nuclear structure of individual resonances: for example, in establishing the tendency of an excited state towards α-cluster  ...  By plotting the known quantity E beam − E A − E p against the calculated quantity p 2 B 2 , a locus demonstrating a linear relationship is obtained with gradient 1 m B and y-intercept −Q 3 if the assumption  ... 
arXiv:1912.00300v1 fatcat:sgkw2erwnbhezchhv3un2zzsdy

Page 1197 of None Vol. 124, Issue 4 [page]

1961 None  
The polarization of the proton group corre- sponding to this transition has been measured for several deuteron energies.*~” In all previous experiments, the measured polarizations have clustered near a  ...  by Martin et al. directly from their measured correlation parameters, and in the present work from the measured polarization using Eq. (5).  ... 

Nonuniversality of elastic exponents in random bond-bending networks

D. A. Head, F. C. MacKintosh, A. J. Levine
2003 Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics  
This indicates that universality for geometric quantities does not imply universality for elastic ones. The implications of this result for actin-fiber networks is discussed.  ...  Near the transition, networks are dominated by bending modes and the elastic modulii vanish with an exponent f=3.0\pm0.2, in contrast with central force percolation which shares the same geometric exponents  ...  D.A.H. was partly funded by a European Community Marie Curie Fellowship. This work is supported in part by the National Science Foundation under Grants Nos. DMR98-70785 and PHY99-07949.  ... 
doi:10.1103/physreve.68.025101 pmid:14525033 fatcat:ds7cn6jgknhnnbxhmalqq4xz4i

Geometric Distortion of the Correlation Function of Lyman‐Break Galaxies

Vibhat Nair
1999 Astrophysical Journal  
A field size of at least 0.2 square degrees is required to distinguish the Einstein-de Sitter model from the flat Lambda=0.7 model, if 1.25 Lyman-break galaxies are measured per square arc minute.  ...  Therefore, the cosmological model can be constrained by measuring this factor from the shape of the contours of the redshift space correlation function, if the effect of peculiar velocities can be taken  ...  Shot noise is caused by the discrete nature of the galaxies from which we measure the correlation function. Cosmic variance arises due to the finite volume we use to estimate a statistical quantity.  ... 
doi:10.1086/307691 fatcat:3hpzh46bajetla6zp47lh3vmvy

Computing Statistics from Man-Made Structures on the Earth's Surface for Indexing Satellite Images

A. Bhattacharya
2007 International Journal of Simulation Modelling  
In this paper, we define several such environments, and classify them with the aid of geometrical and topological features computed from the road networks occurring in them.  ...  The relative failure of network extraction methods in certain types of urban area obliges us to segment such areas and to add a second set of geometrical and topological features computed from the segmentations  ...  The data was kindly provided by CNES and Sup'com, Tunis. The work of the first author is supported by an INRIA PhD fellowship.  ... 
doi:10.2507/ijsimm06(2)s.02 fatcat:mlhnfcbrljgvdcakcheqov4bwi

Gravitational lensing in braneworld gravity: formalism and applications

Supratik Pal, Sayan Kar
2008 Classical and quantum gravity  
We obtain general expressions for measurable quantities such as time delay, deflection angle, Einstein ring and magnification.  ...  Subsequently, we estimate the deviations (relative to the standard lensing scenario) in the abovementioned quantities by considering the line elements for clusters and spiral galaxies obtained by solving  ...  γ 1 unchanged γ 2 = γ 2R 3 4 − 4πGρ 0 γ 2 v 2 c b γ 2 less by 25% γ = γ 2 ⇒ change in shape 25% less In a nutshell, the quantities differ by ∼ 25% from GR, which is good enough to distinguish between the  ... 
doi:10.1088/0264-9381/25/4/045003 fatcat:eesu2coodjbeljrrks35hfjjn4

Indexing Satellite Images with Features Computed from Man-Made Structures on the Earth's Surface

A. Bhattacharya, M. Roux, H. Maitre, I. H. Jermyn, X. Descombes, J. Zerubia
2007 2007 International Workshop on Content-Based Multimedia Indexing  
In order to distinguish between the two urban classes (USA and Europe), the entropy of the histogram of angles at junctions, H β , where β j is the vector of angles between road segments at junction j,  ...  The same measure can also be used to distinguish between Mountains and Fields, while the 'density' features distinguish rural networks from urban networks.  ... 
doi:10.1109/cbmi.2007.385418 dblp:conf/cbmi/BhattacharyaRMJDZ07 fatcat:kmaszg5enfcdjkyht3gxjximwq

ENERGY LANDSCAPES: Flirting with Catastrophe

R. H. Leary
2001 Science  
One may measure the angular distribution by moving a detector about the intersection region and measuring the intensity of scattered molecules at each angle.  ...  In higher dimensions, saddle points are thus distinguished by an index d that represents the number of independent directions for which the potential is at a maximum.  ... 
doi:10.1126/science.1065303 pmid:11557867 fatcat:s3v4ugqkubb6bpq2f62raofbzy

The COST259 Directional Channel Model-Part I: Overview and Methodology

A.F. Molisch, H. Asplund, R. Heddergott, M. Steinbauer, T. Zwick
2006 IEEE Transactions on Wireless Communications  
Finally, the concepts of clusters and visibility regions are used to account for large delay and angular spreads that have been measured.  ...  A layered approach, which distinguishes between external (fixed), large-scale-, and small-scale-parameters allows an efficient parameterization.  ...  A cluster consists usually of several multipath groups with similar delays and angles, and is surrounded (in the delay-angle plane) by areas of no "significant" power. 17 Consequently, the MPCs belonging  ... 
doi:10.1109/twc.2006.256966 fatcat:bgv56vw3njfyvk2s7vot4v6j7q

Automated analysis of courtship suppression learning and memory inDrosophila melanogaster

Md. Alimoor Reza, Siddhita D. Mhatre, J. Calvin Morrison, Suruchi Utreja, Aleister J. Saunders, David E. Breen, Daniel R. Marenda
2013 Fly  
This work was supported by grants from the NIH, R01NS057295 (to AJS), R21RR026074 (to DRM).  ...  Flies are computationally clustered into two groups using geometric feature vectors automatically derived from videos. Grey bars indicate CI as computed by the software program for each group.  ...  As mentioned above, this software calculates 5 geometric quantities that are used to create 8-dimensional feature vectors for each video sequence.  ... 
doi:10.4161/fly.24110 pmid:23644900 pmcid:PMC3732329 fatcat:q3cy7edsanea7anumon35v5nyq

A morphological study of cluster dynamics between critical points

Thibault Blanchard, Leticia F Cugliandolo, Marco Picco
2012 Journal of Statistical Mechanics: Theory and Experiment  
We study the geometric properties of a system initially in equilibrium at a critical point that is suddenly quenched to another critical point and subsequently evolves towards the new equilibrium state  ...  We focus on the bidimensional Ising model and we use numerical methods to characterize the morphological and statistical properties of spin and Fortuin-Kasteleyn clusters during the critical evolution.  ...  (7) and (20) , we obtain the following form for the variance of the winding angle: θ 2 = ct + 4κ 8 + κ ln l. (21) The winding angle variance, θ 2 (l, t), is measured as a function of the distance l  ... 
doi:10.1088/1742-5468/2012/05/p05026 fatcat:zg5ngmwrabgzhlpkkjg3bjdqpi

Swarm-Based Edge Bundling Applied to Flow Mapping [chapter]

Evgheni Polisciuc, Penousal Machado
2017 Communications in Computer and Information Science  
Nowadays, a technique known as edge bundling, which is geometric in nature, is often applied to reduce visual clutter and create meaningful traces that highlight the main streams of flow.  ...  This project is partially funded by sonae: Sonae Viz -Big Data Visualization for retail, and by Fundação para a Ciência e Tecnologia (FCT), Portugal, under the grant SFRH/BD/ 109745/2015.  ...  The compatibility measures are composed by the set of rules, which are based on the comparison of angles. In our approach we only consider the angle in the compatibility measure.  ... 
doi:10.1007/978-3-319-64870-5_15 fatcat:73r3y5wl65fkre5bryjdvnwj2m
« Previous Showing results 1 — 15 out of 38,796 results