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Ilościowa ocena urobku na potrzeby symulacji procesu jego rozpływu kopalnianą siecią transportową

Bardziński P. J., Król R.

Transport Przemysłowy i Maszyny Robocze

2018

Nr 1

15--18

Przeprowadzono analizę ilościową transportowanej rudy na podstawie odczytów z wag przenośnikowych oraz raportów operatorów URB, dotyczących masy urobku dostarczanego przez wozy transportowe do wybranych punktów załadowczych. Mimo dużych różnic między odczytami dokonywanymi w trakcie zmian, po skumulowaniu odczytów i przedstawieniu ich w przedziałach dobowych, zauważono, że wielkości mas transportowanych w ciągu dnia niewiele się różnią od siebie. Wskazuje to na wysoką jakość kontroli transportu. Porównano rozbieżności między odczytami z wag a danymi z systemu MOPRONA, które wynikają z błędów pomiarowych wag przenośnikowych, założonych i uogólnionych pojemności wozów transportujących urobek z przodków do punktów załadowczych oraz terminowości odczytów z wag. Opisane badania wykonano na potrzeby stworzenia modelu procesu rozpływu urobku w wybranej podziemnej kopalni rud miedzi.

Quantitative analysis of transported ore was based on readings from belt scales and URB operator reports regarding the ore mass delivered by haul trucks to the chosen loading points. Despite substantial differences between the readings performed on each shift, after the readings were aggregated and presented on their daily Schedule intervals, only minor differences were observed between the ore masses transported during the day. This indicates the high quality of transport control. A comparison was made between the readings from belt scales and the data from MOPRONA system. The differences were caused by measurement errors of belt scales, assumed and generalized capacity of vehiclestransporting the ore from mining fronts to the loading points as well as the deviations from regularity of belt scale reads. The described research was performed for the purpose of simulation of the ore flow distribution in the chosen underground copper ore mine’s transport system.

Determination of the electronic band structure of the rutile polymorph of TiO2: a quantum chemical approach

Bardziński P. J.

Materials Science Poland

2011

Vol. 29, No. 3

223--232

The aim of this work is the investigation of the relationship between the electronic band structure of the TiO2 rutile and the dimensionality of the system. For three dimensional system the bulk form of rutile was considered, while a slab model was chosen in order to represent the titanium (IV) dioxide (110) surface. The influence of changing the number of atomic layers on the bandgap value for the (110) surface was also examined. Density of states referring to the bands from the first valence band up to the bottom of the conduction band was projected on the whole set of atomic orbitals as well as on the significant shells of the titanium and oxygen atoms. Ab initio calculations with a B3LYP functional were carried out. Basis sets used were modified Ti 86-411(d31)G darco unpub and O 8-411 muscat 1999. The results are compared with experimental and computational data already available in the literature. Surface termination problem was discussed and the application of the obtained results as a starting point to obtain the first model of the rutile titania nanotube was proposed. The surface formation energies for rutile planes with a different surface terminations were compared and the modification to the equation needed for surface energy calculation was introduced.