The flotation process characterization is typically based on the mineral properties and related to feed particle size. Laboratory testing allows for evaluation of batch kinetics, while plant surveys are carried out evaluation, sometimes rougher stage also characterized by considering either full sampling circuit or short-cut method. Comparisons results useful identifying scale-up factors. kinet...

Analysis of the vibration reduction characteristics shock absorbers is crucial for engines. In this study, fractal theory was applied to contact surface an under-platform damper (UPD), and influence excitation force in same opposite directions on roughness studied. First, based geometry (FGT), characterization method a UPD proposed. Then, friction mechanical model rough established by combining...

Graphite ore collected from Hunan province, south China was characterized by chemical analysis, X-ray diffraction, and optical microscopy. Rougher and multi-stage flotation tests using a mechanical flotation cell and a flotation column containing an additional centrifugal force field were carried out to promote its grade and economic value. In rougher flotation, both the mechanical flotation ce...

Lactobacillus plantarum A6, isolated from fermented cassava, can break down cassava raw starch that has not been subjected to preliminary physicochemical treatment. When the pH was kept at 6, the microorganism cultured in a bioreactor excreted a high alpha-amylase activity (60 U/ml). Synthesis of the enzyme occurred during the stationary phase and resulted in full hydrolysis of the cassava star...

Surface roughness has been considered as an important influencing factor for cell response. The aim of this study was to find out whether MC3T3-E1 cells, a mouse osteoblast-like cell line, can sense the amplitudes of surface topography of titanium alloy (Ti6Al4V), and if surface-dependent cell morphology would be presented on the substrata with varied roughness. A series of polished samples (Ra...

BACKGROUND When provisional restorations are worn for long term period, the adhesion of bacteria becomes a primary factor in the development of periodontal diseases. The aims of this study were to evaluate the surface roughness and bacterial adhesion of four different provisional fixed prosthodon-tic materials. METHODS Ten cylindrical specimens were prepared from bis-acrylic composites (PreVI...

A beetles' first line of defense against environmental hazards is their mesothoracic elytra--rigid, protective forewings. In order to study the interaction of these wings with water, the surface microstructures of various beetles' elytra were observed by Environment Scanning Electron Microscopy (ESEM) and Atomic Force Microscopy (AFM). Chemistry components were ascertained using X-ray photoelec...

the endocarp of celtis australis l. with hyrcanian forests of northern iran and arid mountains of northern africa ecotypes were studied considering macro and micro morphologic characteristics, using binocular and scanning electron microscope. the aim of this research was to evaluate the endocarp diversity in different ecological conditions. the results showed that celtis australis l. is bigger,...

We report the first successful measurement (with HST/WFPC2) of a significant proper motion for a m V ∼ 25 object which we had proposed as the optical counterpart of the radio pulsar PSR B0656+14. The yearly displacement of 43±2 mas is highly significant and, while in agreement with early, rougher, radio measurements , stands out for its vastly improved accuracy. Together with the report of a po...