Dust flows around an obstacle in three-dimensionally extended dust clouds have been investigated on parabolic flights. As the obstacle, a tungsten wire has installed midplane between electrodes of parallel-plate radio frequency discharge. A periodic motion was generated by superimposing low-frequency modulation electrodes, shifting cloud electrodes. Due to nature motion, several shocks could be observed at varying densities. When flow transonic or supersonic, bow were formed upstream and...

In this paper, we give a detailed description of novel plasma chamber-the Zyflex chamber-that has been specifically designed for complex/dusty research under reduced gravitational influence as realized during parabolic flight or aboard the International Space Station. The cylindrical, radio-frequency driven discharge device includes variety innovations that, example, allow us to flexibly adjust parameters and its volume via enhanced generation control movable, multi-segmented electrode...

First results of complex plasma experiments in microgravity with grid electrodes the Ekoplasma facility are presented. These separate region production from working volume where microparticles injected. Grid allow a control parameters, and provide nearly force-free environment for microparticles. The show that electrode method can be applied to plasmas this technology yields promising new experimental future research topics.

Properties of self-excited dust acoustic waves under the influence active compression particle system were experimentally studied in laboratory and microgravity conditions (parabolic flight). Ground based experiments clearly show that wave properties can be manipulated by changing discharge volume, its aspect ratio, thus density. Complementary conditions, performed to exclude effects gravity inflicted sedimentation anisotropic behavior, less conclusive due residual fluctuations planes...

Template matching is a well-proven approach in the area of articulated object tracking. Matching accuracy and computation time template are essential yet often conflicting goals. In this paper, we present novel, adaptive based on silhouette object. With our approach, ratio between speed simply modifiable parameter, and, even at high accuracy, it still faster than state-of-the-art approach. We approximate by small set axis-aligned rectangles. Utilizing integral image, can thus compare with an...

During a long term research in the field of evacuation simulation, one two most questions, which have been asked, are "Where should I place pedestrians my simulation?" and "Which pre-movement time choose?" To answer these placed different locations to show effect time, building interval has varied (we choose uniform distribution for interval). What we found was boundary value, on influence calculated changed.

Detection of articulated objects in images, including location and state, is an important challenging task many object tracking applications. Image edges have proven to be a key feature, although their quality influenced by factors. In this paper, we propose novel edge gradient-based template matching method for detection. contrast other methods, ours does not perform any binarization or discretization during the online matching. This facilitated new continuous gradient similarity measure....

The micrometer-sized particles in a complex plasma can be directly visualized and recorded by digital video cameras. To analyze the dynamics of single particles, reliable algorithms are required to accurately determine their positions sub-pixel accuracy from images. Here, we combine with common techniques for image processing, study several algorithms, pre- post-processing methods, impact choice threshold parameters.

The influence of a supersonic projectile on three-dimensional complex plasma is studied. Micron sized particles in low-temperature formed large undisturbed system the new 'Zyflex' chamber during microgravity conditions. A probe particle excited Mach cone with number M $\approx$ 1.5 - 2 and double structure weakly damped cloud. speed sound measured different methods charge estimations are compared to calculations from standard theories. high image resolution enables study cones single level...

A new experimental method for creating void-free complex (``dusty'') plasmas under microgravity conditions is presented. The based on a pulsed operation mode of four-channel radio-frequency generator plasma sustainment. dust cloud micrometer-sized particles can be immersed in the bulk low temperature conditions. It typically contains central volume depleted - void that prevents generation large, continuous clouds. Experiments performed at different neutral gas pressures and discharge volumes...

A new experimental method for creating void-free complex (dusty) plasmas under microgravity conditions is presented. The based on a pulsed operation mode of four-channel radio frequency generator plasma sustainment. dust cloud micrometer-sized particles can be immersed in the bulk low temperature conditions. It typically contains central volume depleted particles—the void—that prevents generation large, continuous clouds. Experiments performed at different neutral gas pressures and discharge...

Abstract As the emission regulations are getting more stringent, engine manufacturers continuously improving performance and emissions along with exploring alternative fuel options. Diesel engines dominate current on highway heavy duty market. Compared diesel, natural gas have many advantages like near zero soot emissions, lower CO2 operating cost, quieter operation, domestic availability. Natural can operate at stoichiometric air ratio allow for use of cost effective three-way catalytic...

Abstract Microparticles immersed in a low‐temperature plasma acquire strong negative charges and thus repel each other. Nevertheless, effective attraction between the microparticles such complex can occur due to interplay fluxes of ions microparticles. Here, we report observation droplets formed during parabolic flight, explain their formation terms ion drag force that sustains droplet. We have found good agreement experimentally determined droplet size its theoretical estimate using...

We discuss the diagnostics of a complex plasma cloud recorded in experiments performed framework Ekoplasma project. A supersonic extra particle is used as probe dynamics. fine-structured Mach cone behind observed. investigate spatial and temporal development with computer based measurement to determine speed sound cloud. Also time position dependent characteristics velocity field are recorded.