Results 21 to 30 of about 6,785,321 (317)
Lexical-Grammatical Means of Expressing Oppositivity in an English Literary Text
RUDN Journal of Language Studies, Semiotics and Semantics, 2021 The article considers the notional nature and peculiarities of genus-species relations between the phenomena of opposition and oppositivity ; it also deals with the lexical-and-grammatica ways of expressing the latter in an English literary text.
Larisa N. Lunkova, Julia I. Frolova
doaj +1 more source
Diethyl 3,3′-[(4-fluorophenyl)methylidene]bis(1H-indole-2-carboxylate)
IUCrData, 2019 In the title compound, C29H25FN2O4, the mean planes of the indole ring systems (r.m.s. deviations = 0.0107 and 0.0158 Å) are approximately perpendicular to each other, subtending a dihedral angle of 87.43 (16)°. The 4-fluorophenyl ring is twisted by 77.6
Yu-Long Li +6 more
doaj +1 more source
Assessing the monitor warm-up time required before a psychological experiment can begin [PDF]
Tutorials in Quantitative Methods for Psychology, 2017 Visual experiments in psychology, psychophysics, and cognitive neuroscience require precise control over stimulus characteristics, such as luminance and contrast. In such experiments, stimuli are most often presented using computer monitors.
Poth, Christian H., Horstmann, Gernot
doaj +1 more source
Binocular contrast vision at and above threshold [PDF]
, 2006 A fundamental problem for any visual system with binocular overlap is the combination of information from the two eyes. Electrophysiology shows that binocular integration of luminance contrast occurs early in visual cortex, but a specific systems ...
Georgeson, Mark A. +6 more
core +1 more source
Crystal structure of diethyl 3,3′-[(2,4-dichlorophenyl)methylidene]bis(1H-indole-2-carboxylate)
Acta Crystallographica Section E: Crystallographic Communications, 2017 In the title compound, C29H24Cl2N2O4, the mean planes of the two indole ring systems (r.m.s. deviations = 0.1249 and 0.0075 Å) are approximately perpendicular to one another, with a dihedral angle of 80.9 (5)° between them.
Yu-Long Li +4 more
doaj +1 more source
IEEE Access, 2021 A fusion algorithm is proposed for the restoration and enhancement of underwater images. Color balance, contrast optimization and histogram stretching are carried out. To alleviate the effect of color shift in an underwater image, the scalar values of R,
Weilin Luo, Shunqiang Duan, Jiwen Zheng
doaj +1 more source
Crystal structure of diethyl 3,3′-[(4-nitrophenyl)methylene]bis(1H-indole-2-carboxylate)
Acta Crystallographica Section E: Crystallographic Communications, 2017 In the title compound, C29H25N3O6, the mean planes of the two indole ring systems (r.m.s. deviations = 0.0115 and 0.0082 Å) are approximately perpendicular to one another, making a dihedral angle of 89.7 (5)°; the benzene ring is twisted with respect to ...
Hong-Shun Sun +4 more
doaj +1 more source
Journal of Ophthalmic & Vision Research, 2022 Purpose: To assess the impact of color and polarity in predicting the changes of visual resolution for different text backgrounds with increasing contrast ratios.
Ai-Hong Chen, Nurulain Muhamad
doaj +1 more source
R_Contrast: Rapid measurement of recognition contrast thresholds. [PDF]
, 1997 R_Contrast is a program for the rapid assessment of recognition contrast thresholds on the ...
Strasburger, Hans, Hans Strasburger
core +1 more source
A Comparative Study of Antegrade Air Pyelogram and Retrograde Air Pyelogram for Initial Puncture Access during Percutaneous Nephrolithotomy [PDF]
Journal of Clinical and Diagnostic Research, 2017 Introduction: Access into the collecting system is considered to be the most critical step for Percutaneous Nephrolithotomy (PCNL). Aim: The present study provides a comparative view into antegrade air pyelography and retrograde air pyelography ...
Dharmendra K. Jangid +4 more
doaj +1 more source