The radioactive radium-225 ((225)Ra) atom is a favorable case to search for permanent electric dipole moment. Because of its strong nuclear octupole deformation and large atomic mass, (225)Ra particularly sensitive interactions in the medium that violate both time-reversal symmetry parity. We have developed cold-atom technique study spin precession atoms held an optical trap, demonstrated principle this method by completing first measurement moment, reaching upper limit...

Longwall shearers operating in the underground mine workings move along longwall face conveyor troughs. The haulage system, which is made up of two kinematic pairs form track wheels installed shearer movers, cooperating with toothed route built conveyor’s throughs, responsible for moving shearer. currently used solutions shearers’ systems do not ensure proper cooperation segments, results failures and breakdowns operation systems, causing significant financial losses. Rigid solution gear...

This paper presents the idea and provides an analysis of rock breakout mechanism utilizing undercut/breakout anchor. The new design is a modification standard undercut anchor, which commonly found in applications involving steel-to-concrete anchorage. Of particular concern was effect strength on anchor-pullout-induced failure mass. A numerical employed to model changes shape size cones under varying conditions as result modifying anchor loading pattern. problem question pivotal for potential...

The paper describes a computer analysis of the pull-out test used to determine force needed pull out fragment rock and shape this broken fragment. analyzed material is sandstone porphyry. included comparison different methods propagation cracks in Abaqus program using Finite Element Method. work also contains description laboratory tests analytical considerations.

We demonstrate a technique for transferring ${}^{226}$Ra atoms from three-dimensional magneto-optical trap (MOT) into standing wave optical dipole (ODT) in an adjacent chamber. The resulting small trapping volume (120 $\ensuremath{\mu}$m diameter) allows high control of the electric and magnetic fields applied to atoms. are first transferred traveling-wave trap, which is then translated 46 cm science subsequently orthogonal standing-wave ODT by application one-dimensional MOT along axis. For...

We observe the electric-dipole forbidden $7s\ensuremath{\rightarrow}8s$ transition in francium isotopes $^{208\ensuremath{-}211}\mathrm{Fr}$ and $^{213}\mathrm{Fr}$ using a two-photon excitation scheme. collect atoms online from an accelerator confine them magneto-optical trap for measurements. In combination with previous measurements of $7s\ensuremath{\rightarrow}7{p}_{1/2}$ we perform King plot analysis. compare thus-determined ratio field shift constants (1.228...

Abstract The method of unconventional solid rock loosening with undercutting anchors and the literature analysis problem are presented. tests test results rocks process a fixed anchor described. were carried out within RODEST project, OPUS 10 competition No. 2015/19/B/ST10/02817, financed by National Science Centre. Numerical modeling as well series laboratory in situ out. stand equipment methodology for conducted four mines, which allowed to obtain determine following characteristics: force...

Scraper chains are the main transport cables of scraper conveyors. Problems related to processes destruction link used in these conveyors described. Design and their division into different types for use presented. The most common damages presented reasons wear discussed.

The main purpose of this work was to tests form and size fatigue wear the top layer oil gear pump wheel (3PW-BPF-24). object operated during a determined number hours at strictly controlled operational environmental parameters. A microscope focal differentiation by Alicona InfiniteFocus G4 (with Focus-Variation optical measuring technology) used for an identification, measurement description noticed superficial defects, which resulted from process earlier thermochemical treatment. finished...

The radioactive radium-225 ($^{225}$Ra) atom is a favorable case to search for permanent electric dipole moment (EDM). Due its strong nuclear octupole deformation and large atomic mass, $^{225}$Ra particularly sensitive interactions in the medium that violate both time-reversal symmetry parity. We have developed cold-atom technique study spin precession of atoms held an optical trap, demonstrated principle this method by completing first measurement EDM, reaching upper limit...

Undercutting anchors are structural elements used in construction and geotechnics to stabilize both structures soils. Their main applications include stabilizing slopes embankments, reinforcing foundations, providing support during tunnel other underground works. The authors propose the use of these rock mass detachment technology. This article presents a comprehensive analysis mechanism behind using an undercutting anchor. Particular attention is given influence parameters such as fracture...

Drives in belt conveyors are critical components of the conveyor system, susceptible to various factors that can cause disruptions and energy losses. In underground mining conditions, risk drive fires is particularly hazardous. Therefore, it necessary develop highly effective fire suppression systems. However, there no guidelines for designing such This study presents a methodology selecting verifying systems drives. The proposed AMIGA system extinguishing on coal mine belts, incorporating...

The method of analyzing the results dust concentration measurements in mine workings that was conducted within ROCD (Reducing risks from Occupational exposure to Coal Dust) European project using developed prediction algorithm is presented. analysis based on average with use CIP-10R gravimetric meters, for respirable PM4 concentration, and IPSQ analyzer instantaneous (including PM2.5 dust) Pł-2 optical meters PM10 dust. Based analyses measurement results, characteristics distribution PM10,...

Longwall shearers’ haulage system of the Eicotrack type, used most often nowadays, is presented in this article. Its disadvantages, causing problems with a correct operation mechanized longwall shearer systems, are discussed. The concept innovative Flextrack, which should reduce occurrence disadvantages mentioned above, described. A course and research results, connected rig tests Flextrack functionality, presented. Measurement results wear stresses, obtained for compared Based on an...

Abstract Theoretical backgrounds of airborne dust control with use atomized stream liquid are presented. Testing procedure, a special attention paid to analysis drops fraction distribution, is presented on the example new nozzle design developed at KOMAG. The method for calculation absorption surface discussed. test results used analyse operational parameters which important systems.

Abstract The following stages of a designing process the toothed haulage segment are presented in article. segment, developed within framework KOMTRACK project, is an element innovative system for highly productive longwall complexes. according to Contract No. POIR.04.01.04-00-0068/17, realized by consortium: KOMAG, AGH University Science and Technology, Foundry Institute, Specodlew Innovative Enterprise Engineering, Ltd. Polish Mining Group, J.S.C., co-financed with means European Regional...

Artykuł dotyczy zagadnienia zastosowania innowacyjnego rozwiązania służącego do czyszczenia maszyn i urządzeń znajdującychsię w wyrobiskach górniczych z zastosowaniem technologii UCT (Underground Cleaning Technology). Podczas podawanajest pod ciśnieniem mieszanina gazów składająca się głównej mierze dwutlenku węgla (suchy lód), który sublimując zwiększaefektywność czyszczenia. prac powstaje zapylenie powietrza wynikające obecności wyrobisku nagromadzeń pyłuwęglowego kamiennego oraz emisji...

An analysis of form and size the fatigue wear gear wheel top layer prototype oil pump (type 3PW-BPF-24) is presented in publication. The object research was subject to endurance tests, so called labour resource test. During this test loaded cycles with maximal working pressure. Additionally, continuous monitoring tests exploitational environmental parameters were conducted. After a completion noticed superficial defects due phenomenon previously applied thermochemical treatment measured...

Today, there are many diagnostic methods and advanced measurement techniques enabling the correct diagnosis assessment of type degree wear cogwheels (gears, pumps, etc.). The present study presents an analysis surface defects a cogwheel oil pump prototype (3PW-BPF-24). test object operated for certain number hours under controlled operating environmental parameters. damage to layer was caused by fatigue phenomena previous thermo-chemical treatment. On basis significant percentage share...

Artykuł dotyczy zagadnienia zastosowania innowacyjnego rozwiązania służącego do czyszczenia maszyn i urządzeń znajdującychsię w wyrobiskach górniczych z zastosowaniem technologii UCT (Underground Cleaning Technology). Podczas podawanajest pod ciśnieniem mieszanina gazów składająca się głównej mierze dwutlenku węgla (suchy lód), który sublimując zwiększaefektywność czyszczenia. prac powstaje zapylenie powietrza wynikające obecności wyrobisku nagromadzeń pyłuwęglowego kamiennego oraz emisji...