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Analysis of Mechanical Traces Left Probably by Ball Lightning

100%

Polak W.

Advances in Science and Technology. Research Journal

2021

tom Vol. 15, no 4

182--191

A possible ball lightning (BL) incident, reported in a local TV as a thunderbolt which during heavy storm entered the room through one of windows and left it through the other, is analyzed. Precise reports, concerning the course of the incident and caused damages, were collected over the next few days in talks with seven eyewitnesses. To verify the reports, photographic documentation, pieces of the window panes, front-window meshes and other fragments of damaged objects were collected simultaneously on the scene. Reconstruction of the glass panes in the laboratory and analysis of Wallner lines existing on surfaces of radial cracks of the panes enabled to identify the direction of force causing the pane breakage. Since the forces turned out to be external for both windows, it excludes the reported movement of BL through the room. From the analysis of traces, the object which destroyed the window pane from the outside should have the following properties differing from those of an ordinary stone: it should be able to break the mesh mechanically on a small circular area, then becoming a larger and softer object be able to push the glass pane forcefully and violently. BL may be responsible for the damages if a solid-like non-hot BL core, capable to explode, is assumed. It is postulated that the BL core is composed of positively-charged crystalline nanoparticles of covalently-bonded nitrogen ions N+ and electron gas inside.

Erstellung von modellgleichungen zur beschreibung von partikelwechselwirkungen bei flockungsprozessen. Teil 1, grundlagen der populationstheorie und des rechenmodells

100%

Dyląg M. , Rosiński J. , Kamieński J.

tom R. 105, z. 5-M

89-96

At work bases of the theory of balance were discussed of the population, the schedule serving for the description of the size of particles and it for changes occurring as a result of lawsuits of the urbanized area, cracking and erosion. In the particular theoretical bases of the method of balance of the population were discussed as well as equations of the quantitative, leaned among others model were derived for adopted assumptions and simplifications.

Modellbildung von Partikelwechselwirkungen bei dispersen Stoffsystemen - Grundlagen der Flockung

100%

Dyląg M. , Rosiński J. , Kamieński J.

tom R. 105, z. 5-M

79-88

At work conditions enabling the flockulation process, connected with the necessity to reduce of repelling forces value which appears between particles of the solid body were introduced and basic sizes and notions were defined. An attempt of working out the dynamic quantitative model based on population balance was carried out. In the model the opposed effects of agglomeration, cracking and erosion for forming flocks were taken into consideration.