scholarly journals Influence of the Stellar Wind on the Nebular Ionization in NGC 1535 and 4361

1983 ◽  
Vol 103 ◽  
pp. 338-339
Author(s):  
J. Adam ◽  
J. Köppen
Keyword(s):  
Wind Velocity ◽  
Stellar Wind ◽  
Short Wavelength ◽  
Wavelength Region ◽  
Absorption Lines ◽  
High Dispersion ◽  
High Excitation ◽  
Short Wavelength Region

The high excitation planetaries NGC 1535 and 4361 were observed with IUE satellite in the short wavelength region at high dispersion. In NGC 1535 we found P Cygni profiles of NV 1238, 1242 and OV 1371 lines with a terminal wind velocity of about 2000 km/sec. In NGC 4361 these lines are narrow absorption lines (width 0.5 Å), probably of photospheric origin.

scholarly journals Ultraviolet Studies of Novae

1979 ◽  
Vol 53 ◽  
pp. 522-522
Author(s):  
M. Friedjung ◽  
B. Rocca
Keyword(s):  
Wavelength Region ◽  
Resonance Absorption ◽  
Absorption Lines ◽  
High Dispersion ◽  
Short Wavelength Region ◽  
Disk Model ◽  
Long Wave ◽  
High Ionization ◽  
Clear Sign ◽  
Wave Region

High dispersion spectra of WZ Sagittae and Nova Cygni 1978, taken by IUE, have been studied by us.Of the two spectra of WZ Sagittae in our possession, the long wave region one shows little besides the interstellar Mg II doublet. The more interesting short wavelength region has relatively wide (130-250 km/s) resonance absorption lines sometimes at the center of wider emission. No clear sign of ejection is seen. The study of the profiles of the CIV, NV, OI, and SiIV resonance lines and of Hell 1640 Å indicates:a) The absorption lines are probably not interstellar (widths, depths).b) A standard accretion disk model can be used. The high ionization lines are probably formed in a region ionized by the boundary layer. The line width indicates that they are formed near the edge of the disk (top of raised edge?), illuminated by radiation from a radius a factor of 10 smaller.

scholarly journals EUVE Spectra of Coronae and Flares

1996 ◽  
Vol 152 ◽  
pp. 81-88 ◽  
Author(s):  
Carole Jordan
Keyword(s):  
Short Wavelength ◽  
Extreme Ultraviolet ◽  
Emission Measure ◽  
Wavelength Region ◽  
Late Type ◽  
Short Wavelength Region ◽  
Plane Parallel ◽  
Parallel Geometry ◽  
Measure Distribution

Following a summary of early solar EUV spectroscopy the spectra of some late-type stars obtained with the Extreme Ultraviolet Explorer (EUVE) are briefly surveyed. Some transitions which are not included in current emissivity codes but could lead to numerous weak lines, and an apparent continuum in the EUVE short wavelength region, are discussed. The importance of the geometry adopted when interpreting the emission measure distribution is stressed, since radial factors can lead to an apparent emission measure distribution gradient that is steeper than the value of 3/2 expected in plane parallel geometry.

APB differentially affects the cone contributions to the zebrafish ERG

2002 ◽  
Vol 19 (4) ◽  
pp. 521-529 ◽  
Author(s):  
SHANNON SASZIK ◽  
AMBER ALEXANDER ◽  
TIMOTHY LAWRENCE ◽  
JOSEPH BILOTTA
Keyword(s):  
Glutamate Receptors ◽  
Spectral Sensitivity ◽  
Visual Processing ◽  
Short Wavelength ◽  
Wavelength Region ◽  
Wave Component ◽  
Adult Zebrafish ◽  
Short Wavelength Region ◽  
Long Wavelength ◽  
Sensitivity Functions

APB (DL-2-amino-4-phosphonobutyric acid) has been found to affect the retinal processing of many vertebrate species as evidenced by the suppression of the b-wave component of the electroretinogram (ERG). The present study examined the effects of APB on the cone contributions to the ERG response of adult zebrafish (Danio rerio). ERG responses were obtained from light-adapted adult zebrafish following intravitreal injection of either saline alone or saline with various concentrations of APB ranging from 10 μm to 500 μM. Visual stimuli were 200-ms flashes of various wavelengths and irradiances. Spectral sensitivity functions were calculated from the irradiance versus response amplitude functions of the a-, b-, and d-wave components of the ERG response. Saline had no effects on the ERG response. However, APB had differential effects on the sensitivity of the b- and d-wave components. The effects of APB on the b-wave component were most apparent in the ultraviolet and short-wavelength portions (320–440 nm) of the spectral sensitivity function, although the b-wave was not completely eliminated at these wavelengths. APB-treated subjects were found to possess the same cone mechanisms (L-M and M-S) in the middle- and long-wavelength areas of the spectrum as saline injected subjects, although absolute sensitivity was lower for the APB-injected subjects. Spectral sensitivity based on the d-wave response was affected by APB but only in the short-wavelength region. All results appear to be independent of the APB dose. These results support the notion that glutamate receptors play a specific role in zebrafish visual processing. In addition, the effects of APB support recent anatomical evidence that the zebrafish retina may possess different types of glutamate receptors.

scholarly journals PHOTOCONDUCTIVITY OF SINGLE-FORMED TlInSe2 SINGLE CRYSTALS

2021 ◽  
Author(s):  
A.Ch. Matiyev ◽  
R.T. Uspazhiev
Keyword(s):  
Single Crystals ◽  
Short Wavelength ◽  
Tensile Deformation ◽  
Wavelength Region ◽  
Crystallographic Axis ◽  
Short Wavelength Region ◽  
Long Wavelength ◽  
Compression Deformation

Based on the performed studies, it was found that tensile deformation along the [1] crystallographic axis of TlInSe2 crystals shifts the energy of indirect transitions to the short-wavelength region, and the compression deformation, on the contrary, to the long-wavelength region.

Pyrene-fused PDI based ternary solar cells: high power conversion efficiency over 10%, and improved device thermal stability

2019 ◽  
Vol 3 (1) ◽  
pp. 93-102 ◽  
Author(s):  
Yanbin Gong ◽  
Kai Chang ◽  
Cheng Chen ◽  
Mengmeng Han ◽  
Xuejun Zhan ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Solar Cells ◽  
Power Conversion Efficiency ◽  
High Power ◽  
Short Wavelength ◽  
Power Conversion ◽  
Wavelength Region ◽  
High Power Conversion Efficiency ◽  
Short Wavelength Region ◽  
Thermal Stability Of

A class of pyrene-fused PDI-NFAs are designed and synthesized for fabricating ternary OSC devices to improve the absorption in the short wavelength region, VOC and thermal stability of the ternary devices.

scholarly journals Re-Evaluation of the Orbital Elements of HDE 226868 = Cyg X-1

1980 ◽  
Vol 88 ◽  
pp. 355-356
Author(s):  
C. T. Bolton ◽  
Douglas R. Gies
Keyword(s):  
Mass Transfer ◽  
Line Profile ◽  
Stellar Wind ◽  
Spectrophotometric Study ◽  
High Dispersion ◽  
Plate Material ◽  
High Excitation ◽  
Orbital Elements ◽  
Hydrogen Lines

We have scanned 75 high dispersion spectrograms of HDE 226868 = Cyg X-1 with the PDS microdensitometer of the David Dunlap Observatory in preparation for a detailed spectrophotometric study of the system. The plate material is identical to that described by Bolton (1972a,b,1975) and includes those plates. We have determined velocities for all of the spectrograms by fitting a parabola to the bottom of each line profile. The lines were divided into three groups, hydrogen lines, He I lines, and high excitation lines (He II, Si III and IV, N III), according to excitation, and separate mean velocities were determined for each group on each plate. We have computed the orbital elements of the system separately for each line group in order to look for differences caused by the effects of mass transfer or stellar wind.

Metamorphic InGaAs/AlAsSb quantum wells grown on GaAs substrates for intersubband devices operating toward short-wavelength region

2006 ◽  
Vol 42 (10) ◽  
pp. 600 ◽  
Author(s):  
S. Gozu ◽  
A. Ueta ◽  
N. Yamamoto ◽  
K. Akahane ◽  
N. Ohtani ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Short Wavelength ◽  
Wavelength Region ◽  
Short Wavelength Region ◽  
Gaas Substrates
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