27,826 research outputs found
Towards Automatic SAR-Optical Stereogrammetry over Urban Areas using Very High Resolution Imagery
In this paper we discuss the potential and challenges regarding SAR-optical
stereogrammetry for urban areas, using very-high-resolution (VHR) remote
sensing imagery. Since we do this mainly from a geometrical point of view, we
first analyze the height reconstruction accuracy to be expected for different
stereogrammetric configurations. Then, we propose a strategy for simultaneous
tie point matching and 3D reconstruction, which exploits an epipolar-like
search window constraint. To drive the matching and ensure some robustness, we
combine different established handcrafted similarity measures. For the
experiments, we use real test data acquired by the Worldview-2, TerraSAR-X and
MEMPHIS sensors. Our results show that SAR-optical stereogrammetry using VHR
imagery is generally feasible with 3D positioning accuracies in the
meter-domain, although the matching of these strongly hetereogeneous
multi-sensor data remains very challenging. Keywords: Synthetic Aperture Radar
(SAR), optical images, remote sensing, data fusion, stereogrammetr
Comparison of Îł-ray spectrometry and ICP-MS methods for measuring radioactive heat-producing elements of rocks: a case study on borehole samples from the Sichuan Basin, China
We compared the consistency of Îł-ray spectrometry and inductively coupled plasma mass spectrometry by analyzing measurement results of the radioactive heat-producing elements U, Th, and K from borehole samples. This analysis was based on 49 samples obtained from mudstone, siltstone, and carbonate rock, and 11 of the 15 control groups showed great consistency. The radioactive heat production (RHP) of carbonate rocks was relatively low (0.23â0.63 ”W mâ3) and was mainly contributed by U. Mudstone and siltstone have higher RHPs, which was 1.73 ± 0.46 and 2.04 ± 0.49 ”W mâ3, respectively
A Re-ranking Model for Dependency Parser with Recursive Convolutional Neural Network
In this work, we address the problem to model all the nodes (words or
phrases) in a dependency tree with the dense representations. We propose a
recursive convolutional neural network (RCNN) architecture to capture syntactic
and compositional-semantic representations of phrases and words in a dependency
tree. Different with the original recursive neural network, we introduce the
convolution and pooling layers, which can model a variety of compositions by
the feature maps and choose the most informative compositions by the pooling
layers. Based on RCNN, we use a discriminative model to re-rank a -best list
of candidate dependency parsing trees. The experiments show that RCNN is very
effective to improve the state-of-the-art dependency parsing on both English
and Chinese datasets
Nuclear enhanced power corrections to DIS structure functions
We calculate nuclear enhanced power corrections to structure functions
measured in deeply inelastic lepton-nucleus scattering in Quantum
Chromodynamics (QCD). We find that the nuclear medium enhanced power
corrections at order of enhance the longitudinal structure
function , and suppress the transverse structure function . We
demonstrate that strong nuclear effects in and ,
recently observed by HERMES Collaboration, can be explained in terms of the
nuclear enhanced power corrections.Comment: Latex, 10 pages including 3 figure
Rescattering effects in hadron-nucleus and heavy-ion collisions
We review the extension of the factorization formalism of perturbative QCD to
{\it coherent} soft rescattering associated with hard scattering in high energy
nuclear collisions. We emphasize the ability to quantify high order corrections
and the predictive power of factorization approach in terms of universal
nonperturbative matrix elements. Although coherent rescattering effects are
power suppressed by hard scales of the scattering, they are enhanced by the
nuclear size and could play an important role in understanding the novel
nuclear dependence observed in high energy nuclear collisions.Comment: 8 pages, 13 figures, to be published in the Proceedings of 1st
International Conference on Hard and Electromagnetic Probes of High Energy
Nuclear Collisions (Hard Probe 2004), Ericeira, Portugal, Nov. 4-10, 200
A new approach to parton recombination in a QCD evolution equation
Parton recombination is reconsidered in perturbation theory without using the
AGK cutting rules in the leading order of the recombination. We use
time-ordered perturbation theory to sum the cut diagrams, which are neglected
in the GLR evolution equation. We present a set of new evolution equations
including parton recombination.Comment: 25 pages, LaTex, 10 PS figures, submmitted to Nucl. Phys.
The Application of the English-Chinese Comparison to Discourse Structures Analysis
This paper makes an attempt to employ the English-Chinese comparison to English discourse structures analysis to help students avoiding some errors of interference from their native language and developing studentsâ linguistic skills to a high level of proficiency. Key words: the English language, the Chinese language, comparison, Discourse structure RĂ©sumĂ©: Lâarticle prĂ©sent tente dâemployer la comparaison anglais-chinois dans lâanalyse de structure du discours anglais pour aider les Ă©tudiants Ă Ă©viter des erreurs dâinterfĂ©rence venues de leur langue maternelle et Ă Ă©lĂ©ver leur le niveau linguistique. Mots-ClĂ©s: langue anglaise, langue chinoise, comparaison, structure du discour
- âŠ