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Early windmills were designed to grind grain and pump water.
The unit of hardness given by the test is known as the Vickers Hardness Number (HV).

Studies also have revealed other additional important properties of Ni-P coatings obtained by autocatalytic reduction method such as paramagnetic characteristics, high electrical resistivity, semi-amorphous and amorphous structure, nanometre grain size [8, 9].
The lower the pH, the specific reactions of electroless process are slower and thus the number of nickel ions deposited on the steel support are decreasing and the phosphorus level increases, phosphorus being in greater quantity in the solution.

We established that at a certain deposition rate and substrate temperature, the two-phase magnetic structure can form in which hexagonal cobalt grains are distributed in a cubic cobalt matrix.
When processing the experimental data, we established that the line intensity (defined as the area under the corresponding absorption curve from a unit surface) per unit thickness of cobalt in the multilayer structure has the dependence presented in Fig. 2 irrespective of the number of pairs of layers n.

According to the Dunham classification, it is Sparstone with obliterative texture, blocky mosaic with relatively homogenous grain size predominantly ~0.3 mm.
Acknowledgements This work was financially supported by BUT student research project number: FAST-J-22-8046 “Study of the kinetics of decomposition reactions of limestones under thermal stress”.

The ilmenite processing are mostly gravity separation, magnetic separation, electrostatic separation, flotation, and joint process, among which gravity separation and electrostatic separation are still the main process of sorting ilmenite, and for fine-grained ilmenite, mainly adopts magnetic separation-flotation process [5].
At present, the local small and medium-sized enterprises mostly adopt the way of using titanium but abandoning iron, which resulting in a large number of complex iron minerals have been discarded.

A design of experiment (DOE) method is necessary for the experimental work which involves many inputs to minimise the number of experiments needed to be preformed.
When the heating rate was increased, the porosity of the samples was lower and the grain became finer so the density was increased [11,12].

EDEM is a discrete element program that has the ability to model entire boundary value problems directly with a large number of particles.
Particles Stress Tamping pines at different frequencies, through observation of the grain total stress condition, in the way of ballasted particles in tamping pines the process of vibration and gripping, the stress of the particles are increased gradually.

The as-built microstructure of Ti-6Al-4V DED material exhibits the typical martensitic structure expected after cooling rapidly from the beta phase field, while HIP’d and aged material shows the expected grain boundary alpha and inter-granular coarse alpha plates.
Tensile properties of Ti-6Al-4V Fabricated by a number of Additive Manufacturing techniques are shown in Figure 4.

The fine grained soil at the Mississippi River estuary and the Yellow River estuary can be treated as Tresca materials, so the thin layer of rigid body (shearing failure part) deformation can be divided into translational and rotational movement.
In the example, the still water depth is 8.0m, under one 50-year reappearing period wind, the mean wavelength is 70.6m, then 10 average of 70.6 of the Rayleigh distributed random numbers are generated, such as: [77.8 15.4 26.8 124.3 132.9 38.0 89.9 130.5 69.1 168.1] m.

This method is a new process of internal polishing using a vibrating tool with attached rare earth permanent magnet, instead of using magnetic material abrasive grains as in conventional magnetic field-assisted polishing.
Therefore, increasing the frequency also increases the number of vibrations that the tool shaft vibrates against the workpiece.