Wide-field birefringent elements

Birefrigent array consists of two plates with retardation properties nearly independent of direction of incident light over unlimited range of wavelengths. Array can be used as birefrigent color filter. Optical properties of plates may also be changed electro-optically rather than thermally

Color Plates

32–35. Sage Grouse • 36–39. Blue Grouse • 40–43. Spruce Grouse • 44–46. Willow Ptarmigan • 47–49. Rock Ptarmigan • 50–51. White-tailed Ptarmigan • 52–54. Ruffed Grouse • 55–58. Pinnated Grouse • 59–60. Sharp-tailed Grouse • 61. Downy Young of Grouse and Partridges • 89. Long-tailed Tree Quail • 90. Bearded Tree Quail • 91. Mountain Quail • 92. Barred Quail and Scaled Quail • 93. Elegant Quail • 94. Gambel Quail • 95. Scaled Quail • 96. Gambel Quail • 97. Hybrid Gambel x Scaled Quail • 98. California Quail • 99. Bobwhite Quail • 100. Spotted Wood Quail • 101. Masked Bobwhite • 102. Black-throated Bobwhite • 103. Buffy-crowned Tree Quail and Singing Quail • 104–6. Harlequin Quail • 107. Chukar Partridge • 108–9. Gray Partridge • 110. Downy Young of Quail

Regularities Of Stability For Printing Forms Of Offset Printing With Dampening In Short Runs

The complex research for the changes in the properties of the printing plates' printing and gap elements influenced by the printing process short runs was conducted, that allowed to determine the change of printing and gap elements' surface microgeometry, also to determine the change of the oxide layer stability, and to explain the decrease of the ink receptivity coefficient. The mathematical regression equation model of the printing plates' elements' impact onto the imprints' optical density in offset printing was developed, that allows estimating and predicting properties of modern brand of printing plate. Work reveals some new facts about characteristics for printability such as influences of printing plate's elements parameters' on color characteristics of imprints. Dampening solution, printing plates application and printing settings as well as color features of the imprints are analyzed in the context of offset printing

Benchmarking matching color in composite restorations

The purpose of this study was to investigate the color samples (A2, A3 and B1) of three different brands of resin composites using dentine masses. 135 discs were prepared (5 plates for each thickness, color and brand of composite material). A colorimetric evaluation, using white and black background, was performed just after preparation. The color was measured corresponding to "Vita" scale and ΔL, Δa, Δb and ΔE values were calculated using a spectrophotometer. The results showed that Value, Chroma and Hue often differ even if the same commercial color and same thickness is used. In conclusion, this study showed that the perfect aesthetics restoration is possible combining individual abilities, experience and correct techniques

Documentation for the machine-readable version of Faint Blue Objects at High Galactic Latitude

The machine-readable data file of a catalog of objects selected according to relative ultraviolet excess from ubv 3-color 1.2 m Palomar Schmidt plates is described

Dangers of Delay, or, the Careless Isabella: Embellished with a Magic Lantern Exhibition

Imprint from label on front wrapper; manufacturing information from p. 12. 12 pages, [1] leaf of plates: 1 color illustrations; 17 cm. Published in the 1800s.https://digitalcommons.georgefox.edu/quakerbooks/1027/thumbnail.jp