Results 241 to 250 of about 3,944,107 (299)

Blue shift paradox in selective reflection

AIP Conference Proceedings, 1995
Blue shift of selective reflection line predicted theoretically has never been seen in the experiments. To solve this paradox we study the origin of this blue shift in more detail.
T. A. Vartanyan, D. Bloch, M. Ducloy
openaire   +1 more source

Can red shifts turn blue?

General Relativity and Gravitation, 1983
Red shifts can turn blue and blue shifts can turn red in real astrophysical situations involving magnetic neutron stars. It is also possible for red shifts and blue shifts to be emitted simultaneously from the same object. With this general relativistic effect, the red shift may be arbitrarily large but the blue shift cannot exceed 1/2.
Jeffrey M. Cohen, Mitchell F. Struble
openaire   +1 more source

Puzzle of SS433: both a blue shift and a red shift

Physics Today, 1979
Recent observations confirm that a fourteenth-magnitude “peculiar” star in our galaxy is a bizarre object indeed, the like of which has not been seen before. Its spectrum exhibits hydrogen (Balmer) and helium emission lines with red and blue shifts indicating velocities up to 50 000 km/sec (0.17c), and these shifts vary roughly sinusoidally with a ...
openaire   +1 more source

COOPERATIVITY OF THE DEHYDRATION BLUE‐SHIFT OF BACTERIORHODOPSIN*

Photochemistry and Photobiology, 1991
Abstract– Dehydration of purple membrane (PM) causes a hlue‐shift of the absorbance maximum from 570 nm to about 530 nm [Lazarev and Terpugov (1980) Biochim. Biophys. Acta590.324–338; Hildebrandt and Stockburger (1984) Biochemistry23,5539–5548].
Robert Renthal, Ruben Regalado
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Expected Number of Blue-shifts and Red-shifts of Ejected Sources

Nature, 1966
Doppler effect in quasar red-shifts and theoretical expected number of blue-shifts and red-shifts of ejected ...
JOHN FAULKNER, JAMES E. GUNN, BRUCE A. PETERSON   +2 more
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Explaining the Blue Shift in Election Canvassing

SSRN Electronic Journal, 2015
We conduct statistical analysis of the rise in the number of votes counted after Election Day (“overtime votes”) and the growing tendency of these votes to disproportionately favor Democrats in presidential elections (the “blue shift”). We provide a historical description of these two time series, from 1948 to 2016, and establish that the timing of the
Edward B. Foley, Charles Stewart III
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Spectral blue shift of thermal radiators

SPIE Proceedings, 1998
The traditional concept of graybody in IR application is investigated and new viewpoints are proposed. It is found that the spectral distribution of thermal radiation of a real body with emissivity (epsilon) < 1, compared with that of absolute blackbody, will shift to shortwave region, i.e. the blue shift phenomena will appear.
Yifeng Wang, Chitao Feng
openaire   +1 more source

Super Broadband Emission Across NIR‐I and NIR‐II Under Blue Light Excitation of Cr3+, Ni2+ Co‐Doped Sr2GaTaO6 Phosphor Achieved by Two‐Site Occupation and Effective Energy Transfer

Laser & Photonics Reviews
The performance of the near‐infrared phosphor‐converted light‐emitting diodes (NIR pc‐LEDs) mainly depends on the NIR emitting phosphors used. Cr3+ doped materials can be excited by blue light chips, but their emission is located in the NIR‐I region (650–
Yifu Zhuo, Fugen Wu, Yaping Niu, Yun Wang, Qi Zhang, Yun Teng, Huafeng Dong, Zhongfei Mu   +7 more
semanticscholar   +1 more source

Red versus blue shifts in trimethylammoiumhexafluorosilicate

Chemical Physics Letters, 2004
Abstract Hartree–Fock and density functional methods have been used to obtain the molecular structure, electron density topography and the vibrational frequencies of trimethylammoiumhexafluorosilicate (TMAHFS). In the isolated molecule the N–H⋯F bond is predicted to be nonlinear with a deviation of 16° from linearity and the SiF 6 2− orients with a
Nilesh R Dhumal, Shridhar P Gejji
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Improper, blue-shifting hydrogen bond

Theoretical Chemistry Accounts: Theory, Computation, and Modeling (Theoretica Chimica Acta), 2002
The spectral manifestation and the nature of improper, blue-shifting hydrogen-bonded complexes are entirely different from those of standard hydrogen-bonded complexes. While the latter class of complexes is characterized by an elongation of the X–H bond and a concomitant red shift of the respective stretch frequency, a contraction of the X–H bond and a
Pavel Hobza, Zdenek Havlas
openaire   +1 more source