Results 51 to 60 of about 1,724,437 (198)
Radio Spectrum and Distance of the SNR HB9 [PDF]
, 2006 New images are presented of the supernova remnant (SNR) HB9 based on 408 MHz and 1420 MHz continuum emission and HI-line emission data of the Canadian Galactic Plane Survey (CGPS) by the Dominion Radio Astrophysical Observatory (DRAO).
Alvarez +24 more
core +2 more sources
Magnifying absolute instruments for optically homogeneous regions
, 2011 We propose a class of magnifying absolute optical instruments with a positive isotropic refractive index. They create magnified stigmatic images, either virtual or real, of optically homogeneous three-dimensional spatial regions within geometrical optics.
Tyc, Tomas
core +1 more source
The Marine Spatial Planning Index: a tool to guide and assess marine spatial planning
npj Ocean Sustainability, 2023 Marine spatial planning (MSP) has the potential to balance demands for ocean space with environmental protection and is increasingly considered crucial for achieving global ocean goals. In theory, MSP should adhere to six principles, being: (1) ecosystem-
Julie M. Reimer +5 more
doaj +1 more source
Spbsampling: An R Package for Spatially Balanced Sampling
Journal of Statistical Software, 2022 The basic idea underpinning the theory of spatially balanced sampling is that units closer to each other provide less information about a target of inference than units farther apart.
Francesco Pantalone +2 more
doaj +1 more source
Characteristics of the Termination Shock: Insights from Voyager [PDF]
, 2005 We examine the energy spectra obtained from the cosmic ray instrument on the Voyager 1 spacecraft during 2002/215 through 2005/60. We find that the energy spectra of protons below ~20 MeV often resemble two power laws with a relatively hard index at low ...
Cummings, A. C., Stone, E. C.
core +1 more source
IEEE Transactions on Knowledge and Data Engineering, 2003 Efficient processing of spatial joins is very important due to their high cost and frequent application in spatial databases and other areas involving multidimensional data. This paper proposes slot index spatial join (SISJ), an algorithm that joins a nonindexed data set with one indexed by an R-tree.
Mamoulis, Nikos, Papadias, D.
openaire +3 more sources
Integrating NoSQL, Hilbert Curve, and R*-Tree to Efficiently Manage Mobile LiDAR Point Cloud Data
ISPRS International Journal of Geo-InformationThe widespread use of Light Detection and Ranging (LiDAR) technology has led to a surge in three-dimensional point cloud data; although, it also poses challenges in terms of data storage and indexing.
Yuqi Yang +3 more
doaj +1 more source
Realization of an all-dielectric zero-index optical metamaterial
, 2013 Metamaterials offer unprecedented flexibility for manipulating the optical properties of matter, including the ability to access negative index, ultra-high index and chiral optical properties.
Anderson, Zachary +5 more
core +1 more source
Review of Philosophy and PsychologyAbstract This paper offers a theory of spatial indexicals like here and there on which such expressions are variables associated with presuppositional constraints on their values. I show how this view handles both referential and bound uses of these indexicals, and I propose an account of what counts as the location of the context on a given ...
openaire +2 more sources
SPAG: Index of spatial agglomeration
Papers in Regional Science, 2019 The paper develops a spatial agglomeration index (SPAG) of the economic activity for the point geo‐localizations of firms. It includes the effects of location, the distance between firms and the overlapping impact of the firms' size. The SPAG builds a new class of measures of the spatial density of the economic activity inside the region, based on the ...
Katarzyna Kopczewska +3 more
openaire +1 more source