Classification of visible point sources using hyperspectral chromotomosynthetic imagery

2012 ◽  
Vol 6 (1) ◽  
pp. 063584
Author(s):  
Randall L. Bostick ◽  
Glen P. Perram
Keyword(s):  
Point Sources

scholarly journals Variability of Platanus orientalis leaves under a heterogeneous environment in the Hissar Valley of Tajikistan

2020 ◽  
Vol 24 ◽  
pp. 00018
Author(s):  
Saifiddin Davlatzoda ◽  
Jamoliddin Bobokalonov ◽  
Elena Baikova
Keyword(s):  
Environmental Pollution ◽  
Leaf Blade ◽  
Diagnostic Value ◽  
Point Sources ◽  
Middle Level ◽  
Heterogeneous Environment ◽  
Local Populations ◽  
Platanus Orientalis ◽  
Cement Factories

Geospatial monitoring of leaves variability has been performed for Platanus orientalis L. (Platanaceae) in Hissar Valley of Tajikistan. 17 local populations were clustered in four territorial groups and investigated by 11 morphometric variables and four indices. Six levels of variability were taken in the classification of S.A. Mamaev. All tested parameters were ranked due to the total score of variability levels. It was established, that indicators which have the combination of high, increased, and medium levels of variability, can be recommended for the purpose of geospatial monitoring. In the studied set of variables are two such ones: (1) the ratio of the length of leaf blade to the lengh of petiole, and (2) the petiole lengh. These two indicators reliably respond to point sources of industrial environmental pollution (Aluminum and Cement factories). Six indicators with domination of the middle level of variability, are of diagnostic value to differ loci inside territorial groups of populations. The results of the experiment confirmed, that set of variability levels for 8 of 15 studied parameters has diagnostic matter for geospatial monitoring of environment conditions in Hissar Valley of Tajikistan.

scholarly journals The Formation of Medial Moraines on Alpine Glaciers

1979 ◽  
Vol 22 (86) ◽  
pp. 43-52 ◽  
Author(s):  
R. J. Small ◽  
M. J. Clark ◽  
T. J. P. Cawse
Keyword(s):  
Field Investigation ◽  
Point Sources ◽  
Glacier Surface ◽  
Alpine Glaciers ◽  
Mechanisms Of Formation

AbstractField investigation of six medial moraines on glaciers near Arolla, Valais, Switzerland, has revealed that all are nourished by englacial till. This is probably derived from supraglacial point-sources on the accumulation zones of the glaciers, and is released in increasing quantities on the ablation zones, where it emerges diffusely or by way of clearly defined transverse or longitudinal debris bands. Possible mechanisms of formation of these debris bands are reviewed, and it is proposed that the transverse bands originated as crevasse fillings on the accumulation zones. Morphologically all six moraines display waxing sections (of increasing height and breadth), related to development of a protective till cover and resultant differential ablation of the glacier surface. Two only display waning sections (of decreasing height), resulting from lateral sliding of till and “inverted” differential ablation resulting from extreme attenuation of till cover. Four “moraine-types” (related to nature of debris supply and detailed morphology) are identified in the Arolla area. It is believed that these may form the basis for a classification of medial moraines.

Stellar Photometry at the Crossroads of the Two Centuries

2003 ◽  
Vol 12 (4) ◽  
Author(s):  
V. Straižys
Keyword(s):  
Spectral Range ◽  
Far Infrared ◽  
Point Sources ◽  
Physical Parameters ◽  
Interstellar Matter ◽  
Powerful Method ◽  
Space Telescopes ◽  
Stellar Photometry ◽  
Far Ultraviolet

AbstractIn the last century photometry was recognized as a powerful method for investigation of physical parameters of stars and of interstellar matter. Photometric investigations now cover the spectral range from the far ultraviolet to the far infrared. The article describes the most important landmarks in development of photometric classification of stars and the number of photometric survey projects accomplished by ground-based and space telescopes and including millions of point sources. The success of the future LSSD and Gaia projects will depend on the use of optimum photometric passbands.

Template-based classification of SDSS-GALEX point sources

2018 ◽  
Vol 39 (5) ◽  
Author(s):  
Ayesha Anjum ◽  
Mousumi Das ◽  
Jayant Murthy ◽  
S. B. Gudennavar ◽  
Rajesh Gopal ◽  
...  
Keyword(s):  
Point Sources

scholarly journals The Formation of Medial Moraines on Alpine Glaciers

1979 ◽  
Vol 22 (86) ◽  
pp. 43-52 ◽  
Author(s):  
R. J. Small ◽  
M. J. Clark ◽  
T. J. P. Cawse
Keyword(s):  
Field Investigation ◽  
Point Sources ◽  
Glacier Surface ◽  
Alpine Glaciers ◽  
Mechanisms Of Formation

AbstractField investigation of six medial moraines on glaciers near Arolla, Valais, Switzerland, has revealed that all are nourished by englacial till. This is probably derived from supraglacial point-sources on the accumulation zones of the glaciers, and is released in increasing quantities on the ablation zones, where it emerges diffusely or by way of clearly defined transverse or longitudinal debris bands. Possible mechanisms of formation of these debris bands are reviewed, and it is proposed that the transverse bands originated as crevasse fillings on the accumulation zones. Morphologically all six moraines display waxing sections (of increasing height and breadth), related to development of a protective till cover and resultant differential ablation of the glacier surface. Two only display waning sections (of decreasing height), resulting from lateral sliding of till and “inverted” differential ablation resulting from extreme attenuation of till cover. Four “moraine-types” (related to nature of debris supply and detailed morphology) are identified in the Arolla area. It is believed that these may form the basis for a classification of medial moraines.

scholarly journals Spectroscopic classification of a complete sample of astrometrically-selected quasar candidates using Gaia DR2

2020 ◽  
Vol 644 ◽  
pp. A17
Author(s):  
K. E. Heintz ◽  
J. P. U. Fynbo ◽  
S. J. Geier ◽  
P. Møller ◽  
J.-K. Krogager ◽  
...  
Keyword(s):  
Point Sources ◽  
Proper Motions ◽  
Selection Efficiency ◽  
Redshift Distribution ◽  
The North ◽  
Identification Techniques ◽  
Gaia Dr2 ◽  
Selection Of ◽  
Quasar Spectrum

Here we explore the efficiency and fidelity of a purely astrometric selection of quasars as point sources with zero proper motions in the Gaia data release 2 (DR2). We have built a complete candidate sample including 104 Gaia-DR2 point sources, which are brighter than 20th magnitude in the Gaia G-band within one degree of the north Galactic pole (NGP); all of them have proper motions that are consistent with zero within 2σ uncertainty. In addition to pre-existing spectra, we have secured long-slit spectroscopy of all the remaining candidates and find that all 104 stationary point sources in the field can be classified as either quasars (63) or stars (41). One of the new quasars that we discover is particularly interesting as the line-of-sight to it passes through the disc of a foreground (z = 0.022) galaxy, which imprints both NaD absorption and dust extinction on the quasar spectrum. The selection efficiency of the zero-proper-motion criterion at high Galactic latitudes is thus ≈60%. Based on this complete quasar sample, we examine the basic properties of the underlying quasar population within the imposed limiting magnitude. We find that the surface density of quasars is 20 deg−2 (at G <  20 mag), the redshift distribution peaks at z ∼ 1.5, and only eight systems (13-3+5%) show significant dust reddening. We then explore the selection efficiency of commonly used optical, near-, and mid-infrared quasar identification techniques and find that they are all complete at the 85−90% level compared to the astrometric selection. Finally, we discuss how the astrometric selection can be improved to an efficiency of ≈70% by including an additional cut requiring parallaxes of the candidates to be consistent with zero within 2σ. The selection efficiency will further increase with the release of future, more sensitive astrometric measurements from the Gaia mission. This type of selection, which is purely based on the astrometry of the quasar candidates, is unbiased in terms of colours and intrinsic emission mechanisms of the quasars and thus provides the most complete census of the quasar population within the limiting magnitude of Gaia.

Note on the spectral classification of carbon stars in the photographic infrared region

1966 ◽  
Vol 24 ◽  
pp. 21-23
Author(s):  
Y. Fujita
Keyword(s):  
Infrared Region ◽  
Spectral Classification ◽  
Carbon Stars

We have investigated the spectrograms (dispersion: 8Å/mm) in the photographic infrared region fromλ7500 toλ9000 of some carbon stars obtained by the coudé spectrograph of the 74-inch reflector attached to the Okayama Astrophysical Observatory. The names of the stars investigated are listed in Table 1.

Diagnostic Value of Electron Microscopy in Soft Tissue Tumors

1970 ◽  
Vol 28 ◽  
pp. 220-221
Author(s):  
Gerald Fine ◽  
Azorides R. Morales
Keyword(s):  
Cardiac Myxoma ◽  
Osteogenic Sarcoma ◽  
Diagnostic Value ◽  
Soft Tissue Tumors ◽  
Amelanotic Melanoma ◽  
Growth Patterns ◽  
Light Microscopic Level ◽  
Mesenchymal Tumors ◽  
Good Agreement

For years the separation of carcinoma and sarcoma and the subclassification of sarcomas has been based on the appearance of the tumor cells and their microscopic growth pattern and information derived from certain histochemical and special stains. Although this method of study has produced good agreement among pathologists in the separation of carcinoma from sarcoma, it has given less uniform results in the subclassification of sarcomas. There remain examples of neoplasms of different histogenesis, the classification of which is questionable because of similar cytologic and growth patterns at the light microscopic level; i.e. amelanotic melanoma versus carcinoma and occasionally sarcoma, sarcomas with an epithelial pattern of growth simulating carcinoma, histologically similar mesenchymal tumors of different histogenesis (histiocytoma versus rhabdomyosarcoma, lytic osteogenic sarcoma versus rhabdomyosarcoma), and myxomatous mesenchymal tumors of diverse histogenesis (myxoid rhabdo and liposarcomas, cardiac myxoma, myxoid neurofibroma, etc.)

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