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in creator/contributor: "Land, C.E."  
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Optical image storage in ion implanted PLZT ceramics

Description: Optical images can be stored in transparent lead-lanthanum-zirconate-titanate (PLZT) ceramics by exposure to near-uv light with photon energies greater than the band gas energy of approx. 3.35 eV. The image storage process relies on optically induced changes in the switching properties of ferroelectric domains (photoferroelectric effect). Stored images are nonvolatile but can be erased by uniform uv illumination and simultaneous application of an electric field. Although high quality images, wi… more
Date: January 1, 1980
Creator: Peercy, P. S. & Land, C. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Photoferroelectric effects in PLZT ceramics

Description: A photoferroelectric effect described as photoassisted domain switching (PDS) is used to store high resolution, high contrast, nonvolatile optical information, including gray scale images in PLZT ceramics. Image storage is achieved by switching the ferroelectric remanent polarization while exposing the image on one of the indium tin oxide electroded surfaces of a PLZT plate, using near-UV light at the PLZT band gap energy (3.35 eV). PDS eliminates the photoconductive films required in previous … more
Date: January 1, 1977
Creator: Land, C.E. & Peercy, P.S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Ion-implanted PLZT ceramics: a new high-sensitivity image storage medium

Description: Results were presented of our studies of photoferroelectric (PFE) image storage in H- and He-ion implanted PLZT (lead lanthanum zirconate titanate) ceramics which demonstrate that the photosensitivity of PLZT can be significantly increased by ion implantation in the ceramic surface to be exposed to image light. More recently, implantations of Ar and Ar + Ne into the PLZT surface have produced much greater photosensitivity enhancement. For example, the photosensitivity after implantation with 1.… more
Date: January 1, 1980
Creator: Peercy, P.S. & Land, C.E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Piezoelectric sensor pen for dynamic signature verification

Description: The concept of using handwriting dynamics for electronic identification is discussed. A piezoelectric sensor pen for obtaining the pen point dynamics during writing is described. Design equations are derived and details of an operating device are presented. Typical output waveforms are shown to demonstrate the operation of the pen and to show the dissimilarities between dynamics of a genuine signature and an attempted forgery.
Date: January 1, 1977
Creator: EerNisse, E. P.; Land, C. E. & Snelling, J. B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Photosensitivity enhancement of PLZT ceramics by positive-ion implantation

Description: The photosensitivity of lead lanthanum zirconate titanate (PLZT) ceramic material used in high resolution, high contrast, and nonvolatile photoferroelectric image storage and display devices is enhanced significantly by positive ion implantation of the PLZT near its surface. Implanted ions include H/sup +/, He/sup +/, Ne/sup +/, Ar/sup +/, as well as chemically reactive ions from Fe, Cr, and Al. The positive ion implantation advantageously serves to shift the absorption characteristics of the P… more
Date: January 28, 1982
Creator: Peercy, P.S. & Land, C.E.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
open access

Computation of Confidence Limits for Linear Functions of the Normal Mean and Variance

Description: A program is described that calculates exact and optimal (uniformly most accurate unbiased) confidence limits for linear functions of the normal mean and variance. The program can therefore also be used to calculate confidence limits for monotone transformations of such functions (e.g., lognormal means). The accuracy of the program has been thoroughly evaluated in terms of coverage probabilities for a wide range of parameter values.
Date: September 1, 1999
Creator: Land, C.E. & Lyon, B.F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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