True-Color Holography

True-color holograms, as they are the most advanced and realistic three-dimensional images obtainable with current technologies, can become valuable tools for the preservation, documentation and diffusion of cultural heritage. In this respect, the transportable Z3RGB color holography system and the HoLoFoS™ illuminant developed by the Hellenic Institute of Holography have been successfully utilized for the in-situ recording and displaying of OptoClones™ (Denisyuk-type color holograms) in four museums and two countries. The holographic image of an OptoClone™ is characterized by a wide angle of view, full parallax and perspective, good color rendition and ultra-realistic reproduction of the optical properties of the materials of an artefact. In this paper, we report on our accumulated expertise in on-site holographic documentation of museum artworks of various types, already from four museums of world caliber and reputation (Athens and Thessaloniki Byzantine, Fabergé Museum of St. Petersburg and Diamond Fund of Russia). In one case, a world’s first, the in-situ recorded OptoClones™ have been subsequently displayed as part of the permanent exhibition of the Byzantine & Christian Museum of Athens in replacement of the original artifacts while on loan. On another occasion involving State Treasures from the Diamond Fund of Russia, the recorded OptoClones™ exhibited inside the Moscow Kremlin were highly appraised by officials and international experts as well as the general public allowing reasonable optimism for the prospects of Display Holography for museums.

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Wavelength selection for true-color holography

Applied Optics ◽

10.1364/ao.33.006811 ◽

1994 ◽

Vol 33 (29) ◽

pp. 6811 ◽

Cited By ~ 17

Author(s):

Mark S. Peercy ◽

Lambertus Hesselink

Keyword(s):

Wavelength Selection ◽

Color Holography ◽

Selection For ◽

True Color

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Application of a Pilot-Scale Pulsed Electrocoagulation system to OCC-Based Paper Mill Effluent

TAPPI Journal ◽

10.32964/tj8.3.14 ◽

2009 ◽

Vol 8 (3) ◽

pp. 14-20 ◽

Cited By ~ 2

Author(s):

YUAN-SHING PERNG ◽

EUGENE I-CHEN WANG ◽

SHIH-TSUNG YU ◽

AN-YI CHANG

Keyword(s):

Water Quality ◽

Quality Indicators ◽

Paper Mill ◽

Pilot Scale ◽

Operating Conditions ◽

Optimal Dosage ◽

Water Quality Indicators ◽

Paper Mill Effluent ◽

Treated Effluent ◽

True Color

Trends toward closure of white water recirculation loops in papermaking often lead to a need for system modifications. We conducted a pilot-scale study using pulsed electrocoagulation technology to treat the effluent of an old corrugated containerboard (OCC)-based paper mill in order to evaluate its treatment performance. The operating variables were a current density of 0–240 A/m2, a hydraulic retention time (HRT) of 8–16 min, and a coagulant (anionic polyacrylamide) dosage of 0–22 mg/L. Water quality indicators investigated were electrical con-ductivity, suspended solids (SS), chemical oxygen demand (COD), and true color. The results were encouraging. Under the operating conditions without coagulant addition, the highest removals for conductivity, SS, COD, and true color were 39.8%, 85.7%, 70.5%, and 97.1%, respectively (with an HRT of 16 min). The use of a coagulant enhanced the removal of both conductivity and COD. With an optimal dosage of 20 mg/L and a shortened HRT of 10 min, the highest removal achieved for the four water quality indicators were 37.7%, 88.7%, 74.2%, and 91.7%, respectively. The water qualities thus attained should be adequate to allow reuse of a substantial portion of the treated effluent as process water makeup in papermaking.

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Color holography: recent improvements and applications

10.1117/12.2001115 ◽

2013 ◽

Author(s):

Hans I. Bjelkhagen

Keyword(s):

Color Holography

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NASA MODIS Previews NPOESS VIIRS Capabilities

Weather and Forecasting ◽

10.1175/waf935.1 ◽

2006 ◽

Vol 21 (4) ◽

pp. 649-655 ◽

Cited By ~ 21

Author(s):

Thomas F. Lee ◽

Steven D. Miller ◽

Carl Schueler ◽

Shawn Miller

Keyword(s):

Satellite System ◽

Infrared Imager ◽

Defense Meteorological Satellite Program ◽

Moderate Resolution ◽

Resolution Imaging ◽

Moderate Resolution Imaging Spectroradiometer ◽

Using Data ◽

Color Simulation ◽

True Color ◽

Real Time Simulations

Abstract The Visible/Infrared Imager Radiometer Suite (VIIRS), scheduled to fly on the satellites of the National Polar-orbiting Operational Environmental Satellite System, will combine the missions of the Advanced Very High Resolution Radiometer (AVHRR), which flies on current National Oceanic and Atmospheric Administration satellites, and the Operational Linescan System aboard the Defense Meteorological Satellite Program satellites. VIIRS will offer a number of improvements to weather forecasters. First, because of a sophisticated downlink and relay system, VIIRS latencies will be 30 min or less around the globe, improving the timeliness and therefore the operational usefulness of the images. Second, with 22 channels, VIIRS will offer many more products than its predecessors. As an example, a true-color simulation is shown using data from the Earth Observing System’s Moderate Resolution Imaging Spectroradiometer (MODIS), an application current geostationary imagers cannot produce because of a missing “green” wavelength channel. Third, VIIRS images will have improved quality. Through a unique pixel aggregation strategy, VIIRS pixels will not expand rapidly toward the edge of a scan like those of MODIS or AVHRR. Data will retain nearly the same resolution at the edge of the swath as at nadir. Graphs and image simulations depict the improvement in output image quality. Last, the NexSat Web site, which provides near-real-time simulations of VIIRS products, is introduced.

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