Method and apparatus for aligning a laser beam projector Patent

Laser beam projector for continuous, precise alignment between target, laser generator, and astronomical telescope during trackin

Method of directing a laser beam with very high accuracy

System will collimate and direct an argon laser beam with high angular tracking accuracy at objects on the moons surface. It can be adapted to missile and satellite tracking

A relativistic study of Bessel beams

We present a fully relativistic analysis of Bessel beams revealing some noteworthy features that are not explicit in the standard description. It is shown that there is a reference frame in which the field takes a particularly simple form, the wave appearing to rotate in circles. The concepts of polarization and angular momentum for Bessel beams is also reanalyzed.Comment: 11 pages, 2 fig

[N]pT Monte Carlo Simulations of the Cluster-Crystal-Forming Penetrable Sphere Model

Certain models with purely repulsive pair interactions can form cluster crystals with multiply-occupied lattice sites. Simulating these models' equilibrium properties is, however, quite challenging. Here, we develop an expanded isothermal-isobaric $[N]pT$ ensemble that surmounts this problem by allowing both particle number and lattice spacing to fluctuate. We apply the method with a Monte Carlo simulation scheme to solve the phase diagram of a prototypical cluster-crystal former, the penetrable sphere model (PSM), and compare the results with earlier theoretical predictions. At high temperatures and densities, the equilibrium occupancy $n_{\mathrm{c}}^{\mathrm{eq}}$ of face-centered cubic (FCC) crystal increases linearly. At low temperatures, although $n_{\mathrm{c}}^{\mathrm{eq}}$ plateaus at integer values, the crystal behavior changes continuously with density. The previously ambiguous crossover around $T\sim0.1$ is resolved

Trapped radiation experiment

Trapped radiation detector on Mariner IV space probe measurement of outer Van Allen belt - feasibility of detecting trapped radiation at Mar

Observations with University of Iowa equipment on Mariner IV, November 1964 - February 1965 Preliminary report

Mariner IV space probe electron and proton density measurements in earth magnetosphere and interplanetary spac

Packing Fractions and Maximum Angles of Stability of Granular Materials

In two-dimensional rotating drum experiments, we find two separate influences of the packing fraction of a granular heap on its stability. For a fixed grain shape, the stability increases with packing fraction. However, in determining the relative stability of different grain shapes, those with the lowest average packing fractions tend to form the most stable heaps. We also show that only the configuration close to the surface of the pile figures prominently.Comment: 4 pages, 4 figure

Power increases situated creativity

The present paper examined whether power was linked with situated creativity. We proposed that powerful (vs powerless) people engage in creative thought when creativity contributes to contextual goals but avoid creative thought when creativity impedes contextual goals. Extending the Situated Focus Theory of Power (Guinote, 2007a; 2010) to creativity, we suggested that powerful people are better able to achieve situational goals because they can flexibly focus on cues that indicate what is required for success in a given context. Across three experiments, we found that powerful (vs powerless) people engaged in more creative thinking when creativity facilitated contextual goals. This was not the case when creativity hindered contextual goals. Further, neither affect (Experiment 2) nor effort (Experiments 1 and 3) contributed to these effects. However, local processing undermined creativity for powerful people, indicating that processing style may contribute to the link between power and situated creativity. These findings suggest that powerful people flexibly vary creativity in line with the situation