Paweł Ciężkowski, Jan Maciejewski, Sebastian Bąk and Arkadiusz Kwaśniewski
The improvement in mineral crushing process efficiency is a very important issue, especially from a technological point of view, which takes into account the preparation of a product with an appropriate grain size and shape (aggregate production). Economic aspects related to energy consumption and cost-consuming processes are equally important. The selection of appropriate crushing devices at each stage of crushing and their configuration have a fundamental influence on the quality of the products as well as the efficiency and energy
Paweł Ciężkowski, Jan Maciejewski and Sebastian Bąk
 CIĘŻKOWSKI P., MACIEJEWSKI J., Badania i analiza maszynowego procesu rozdrabniania wapienia zwartego Morawica, Przegląd Mechaniczny, 2014, nr 5, 35-41, ISSN: 0032-2259.
 CIĘŻKOWSKI P., MACIEJEWSKI J., BĄK S., KUŚMIERCZYK J., Study on the Efficiency of the Crushing Processes Using the Model of Jaw Crusher, Machine Dynamics Research, 2015, Vol. 39, No 2, 123-132.
 CIĘŻKOWSKI P. (ed.), Kruszenie skał - teoria, eksperyment i zastosowania inżynierskie, (P. Ciężkowski), Instytut Technologii Eksploatacji - PIB, Radom ul. K
Mehdi Missoum Benziane, Noureddine Della, Sidali Denine, Sedat Sert and Said Nouri
, 23 ] Experimental results from various tests
(direct shear, unconfined compression and triaxial compression) have confirmed that the efficiency of fiber treatment is highly dependent on the fiber concentration, on testing conditions (e.g., stress and strain levels, stress path and loading direction) and on a large number of variables related equally to the physical and dimensional characteristics of both fiber and sand matrix (e.g.,fiber and particle sizes and particle size distribution, particle shape and fiber surface, fiber/grain frictional properties
Hala Hammadeh, Farzat Askifi, Andrzej Ubysz, Marek Maj and Amjad Zeno
there are two principle patterns of flow in a silo: funnel flow and mass flow. [ 1 , 2 , 9 ] In mass flow, all the stored material is in motion and is directed downward, and there are no stagnant zones. While these stagnant zones appear in funnel flow beside the wall, which reduces the efficiency of the silo.
One of the proposed solutions to avoid the problems of funnel flow is by using an Insert (an input element) inside the silo, [ 4 , 5 , 6 , 11 , 14 ] where choosing the appropriate position of the Insert inside the silo contributes significantly to reducing
determined. Average values of energy parameters and uniaxial compression strength were analysed in this project.
Tests were conducted with material servo-control testing machine MTS-815. Conditions of the experiments and tested parameters are presented in Figure 2 .
Conditions of experiments and parameters (ϕ – diameter of a sample; h– height of a sample).
Due to the high rigidity of material testing machine MTS-815 and the efficiency of the supply hydraulic system, it was possible to obtain a complete stress-strain curve of the loaded rock samples
This paper presents a concept for vibration-mitigation techniques with the potential to reduce ground vibration amplitudes by applying an additional vibration source. The idea of an additional generator is verified in the case of an impact load for the points located on the ground surface and below it. Equations of motion for the damped transversally isotropic ground model with the absorbing boundary conditions are presented and numerically integrated using FlexPDE software, based on the finite element method. The efficiency of the solution is analyzed in terms of reducing the vertical and horizontal components. Results are presented in the form of a dimensionless amplitude reduction factor. In each case being analyzed, a vibration mitigation effect in a three-story building was achieved.
., ŻAKOWICZ S., Physical and hydraulics properties of the MSW for water balance of the landfill , Proceedings of the 3rd International Congress on Environmental Geotechnics, Lisboa, 1998, Vol. 1, 217-222.
 KODA E., Local water monitoring on surroundings of sanitary landfill , Annals of Warsaw Agricultural University - SGGW, Land Reclamation, 2004, No. 35a, 131-144.
 KODA E., Assessment of efficiency of the old landfill protection system based on transport modeling and monitoring research , Proceedings of the 6th International
Dariusz Łydżba, Adrian Różański, Magdalena Rajczakowska and Damian Stefaniuk
The needle probe test, as a thermal conductivity measurement method, has become very popular in recent years. In the present study, the efficiency of this methodology, for the case of composite materials, is investigated based on the numerical simulations. The material under study is a two-phase composite with periodic microstructure of “matrix-inclusion” type. Two-scale analysis, incorporating micromechanics approach, is performed. First, the effective thermal conductivity of the composite considered is found by the solution of the appropriate boundary value problem stated for the single unit cell. Next, numerical simulations of the needle probe test are carried out. In this case, two different locations of the measuring sensor are considered. It is shown that the “equivalent” conductivity, derived from the probe test, is strongly affected by the location of the sensor. Moreover, comparing the results obtained for different scales, one can notice that the “equivalent” conductivity cannot be interpreted as the effective one for the composites considered. Hence, a crude approximation of the effective property is proposed based on the volume fractions of constituents and the equivalent conductivities derived from different sensor locations.
Ceramic water filters were prepared from different proportions of kaolin and soft wood and sintered at 900 °C, 950 °C, and 1000 °C. The flow rate, conductivity, pH of filtered water and removal efficiency (microbial, water hardness agent’s, nitrite and turbidity) were analysed. The ceramic filter with 15 % saw dust, 80 % clay and 5 % grog that was fired at temperature of 950 °C or 1000 °C showed the best removal efficiency. Statistical ANOVA tests showed a significant difference between ceramic filters with various compositions in their removal efficiencies.
Iman Faridmehr, Mohammad Reza YazdaniPour, Mohammad Javadi Jokar and Togay Ozbakkaloglu
and density were considered.
6 Seepage Analysis
In this section, a numerical model using Seep-3D software was developed to evaluate the efficiency of the cut-off wall to decrease the seepage over the dam’s foundation. To this end, the numerical results were validated by instrumentation statistics (from 17-years dam operation).
6.1 Numerical Model
The numerical model was developed in Seep-3D software where all seven materials used in the real dam project, including the dam’s body and cut-off wall, were considered during simulation having the same material