TWO-PHOTON COHERENT TRANSIENTS

Two-photon mutation, free-induction decay, and population inversion by adiabatic rapid passage have been studied in NH//3. These effects are easily visualized with a vector model. Relaxation times T//1 and T//2 have been measured

DISPERSIVE MODULATOR - A NEW CONCEPT IN OPTICAL PULSE COMPRESSION

A description of a new method of optical pulse compression, named the dispersive modulator, is given. In this device, amplitude modulation and temporal compression of light were achieved by passage through a Stark-modulated, near-resonant dispersive medium. The relationship between the dispersive modulator and the chirp compression scheme is discussed. Experimental results on modulation of 10- mu CO//2 and N//2O laser light, including a case where 100 percent modulation was observed, are presented

OPTICAL PROBING AND TESTING TECHNIQUE FOR LIGHT-SENSITIVE ELECTRICAL DEVICES.

Semiconductor or superconductor devices may be tested one at a time without electrically probing each device individually by optically probing each device with a light intensity sufficient nondestructively to affect the electrical transport mechanism of the device and then observing the effect the light probe has at some common and remote electrical point or points. Modern LSI and VLSI contains a large number of devices on a single chip. It is impossible to have probing or testing leads for each of them. A simple optical scanning technique is described which can be used to locate the bad devices on a chip without adding many more voltage leads. This technique works for light-sensitive devices in general, either semiconductive or superconductive, discrete or two-dimensional continuum

Isoforms of cyclic AMP response element binding proteins in Drosophila S2 cells4408

Activation or inhibition of the cyclic AMP (cAMP)-protein kinase A (PKA) pathway can ultimately regulate the transcription of a variety of genes. In vertebrates, the best characterized nuclear targets of PKA are the &#039;cAMP response element&#039; (CRE) binding proteins (CREB). Differences in the transcriptional response to this pathway between cells and tissues can be based on the presence of distinct CREB isoforms. In this context, we have now investigated the presence of different dCREB transcripts in a stable, embryonic insect cell line, i.e., Drosophila Schneider 2 (S2) cells. In addition, we have studied the possible effect of cellular cAMP- and Ca2+ increases on the expression of a luciferase reporter in cells transfected with a CRE-containing reporter gene construct. In combination with recent data from the literature, our results indicate that the regulation of CRE-dependent gene expression shows some important differences between insects and vertebrates</p

Intrinsic Regularity Detection in 3D Geometry

Abstract. Automatic detection of symmetries, regularity, and repetitive structures in 3D geometry is a fundamental problem in shape analysis and pattern recognition with applications in computer vision and graphics. Especially challenging is to detect intrinsic regularity, where the repetitions are on an intrinsic grid, without any apparent Euclidean pattern to describe the shape, but rising out of (near) isometric deformation of the underlying surface. In this paper, we employ multidimensional scaling to reduce the problem of intrinsic structure detection to a simpler problem of 2D grid detection. Potential 2D grids are then identified using an autocorrelation analysis, refined using local fitting, validated, and finally projected back to the spatial domain. We test the detection algorithm on a variety of scanned plaster models in presence of imperfections like missing data, noise and outliers. We also present a range of applications including scan completion, shape editing, super-resolution, and structural correspondence.