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This type of solutions is time limited in its application, so big is the risk of vanishing the global sense of the structure where the stone is included.
Taking granite as an example, we can summarize [4] the chemical phenomena that explain the alterations of feldspars (other granite components, as quartz and muscovite, do not suffer chemical degradation): · progressive hydration of the aluminium environment · subsequent modification of the coordination number of aluminium with oxygen (from 4 to 6) · lixiviation of alkaline metals (sodium and potassium) · reduction of silicic acid levels · transformation of matrix structure (from 3D into 2D-clay particles) This way the granitic rock is transformed into clay (the phenomenon is called kaolinization).
The alkaline activation uses exactly the opposite processes enabling the reversibility of the chemical transformations experienced so far by the rock: · previous dehydration of clay (by calcination) · therefore modification of the coordination number from 6 to 4 · enrichment of sodium or potassium levels · increase of the silicic acid level · transformation of matrix structure (from 2D into 3D) The dehydration treatment of clay (kaolin is the most used type of clay) is made in a furnace at 750ºC, giving place, as a consequence, to an amorphous material called metakaolin (MK).
[4] Teixeira-Pinto, A. – “Sistemas Ligantes Obtidos por Activação Alcalina dos Metacaulinos”, PhD Thesis, Universidade do Minho (2004) [5] Davidovits, J. – “Chemistry of Geopolymeric Systems.

Munir1,e,* 1Department of Chemical Engineering and Materials Science, University of California, Davis, CA 95616, USA. 2Institute of Physical Chemistry, RWTH Aachen University, D-52056 Aachen, Germany.
In this regard, attempts were made to assess the properties of solid oxide electrolytes when their structure is in the nanometric scale.
Examples of the latter include crystal structure, surface topography, and reactivity.
Powders containing agglomerates produce an inhomogeneous structure when compacted, a circumstance that leads to lower green densities [20].

It should be noted here that the sodium hydrogen titanate formed by the NaOH treatment takes a layered structure, where Na+ ions are located in the interspaces of the TiO62- layers, as shown in Fig. 3.
However, the resultant metal did not form the apatite in SBF, because the calcium titanate takes a dense structure shown in Fig. 3, to give only small amount of release of the Ca2+ ions into SBF.
Reproduced with permission from ref. [9], Copyright 2013, Royal Society of Chemistry.
The same metals in a porous form was deeply penetrated with newly grown bone [12], when it was implanted into rabbit femur, and formed bone tissue in the porous structure ectopically even when it was implanted into muscle of dog. 4.

The observed peaks for the planes (220), (311), (400), (422), (511) and (440) confirmed the phase formation of CoFe2O4 with spinel structure.
The dielectric constant (ε') results are due to heterogeneous structure of the material.
Chandra, Preparation and characterization of nanosize nickel-substituted cobalt ferrites (Co1−xNixFe2O4), Journal of Solid State Chemistry 178 (2005) 3183-3189
Lee, Electronic structure and magnetic properties of the Ni0.2Cd0.3Fe2.5−xAlxO4 (0 ≤ x ≤ 0.4) ferrite nanoparticles, Journal of Nanoscience and Nanotechnology 11 (2011) 396-401

The secretion of oil pointed to a durable structure of the lubricant and the dropping point temperature indicated applicability in plastic cold forming processes (Tab. 3).
Oil secretions reflecting the durability of the structure of the lubricant were similar.
The structure of the lubricant was durable.
Smolyakowa, Production of greases from industrial petroleum wastes, Chemistry and Technology of Fuels and Oils, 2007 (43) 281- 283

The c/a ratio of θ-MnNi crystal is 0.94 and the crystal structure of twin crystal is not exactly identical to that of the matrix. c/a ratio of the twin crystal is 1.02 quite similar to fcc crystal.
The DO24 structure is an ordered phase and the new fcc structure formed by dislocation climb is also ordered and has same chemistry as the η-Ni3Ti phase.

To further study the metallographic structure, cross-sections polished with sand-paper grit 1200 were prepared.
Fig. 6 SEM microstructure of ZrO2 + 3 vol. % Ti composite (a) and the analysis of the microstructure by graphical method (b) Fig. 6 shows the microstructure of ZrO2 + 3 vol.% Ti composite (Fig. 6a) and the processed image of this structure (Fig. 6b).
The chemical composition analysis of the selected areas and points confirmed the homogeneity of the structure.
Szafran, Ceramic-metal composites with an interpenetrating network, Materials Chemistry and Physics 81 (2003) 329-332 [3]K.

To reveal the type of the structure and its transformation after the welding process, Differential Scanning Calorimetry (DSC) was used.
Fig. 7 The recorded burst stress - Standard Extrapolation Method ISO/TR 9080, 1992(E) As general conclusions it has to be mentioned the following considerations: · The burr has lower plasticity comparing to the base material and comparing to the heat affected zone, due to the direct contact with the heated tool which means faster heating and the modification of the chain structure
Kenneth , et al., Polyolefins, Ullmann'sEncyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2005,. doi:10.1002/14356007.a21_487 [6] R.
Maszybrocka, et al., Changes in the Molecular Structure of UHMW Polyethylene under the Influence of Thermal and Radiation Modification, as Well as Time, Solid State Phenomena, vol, 197, 19-24, 2013, 10.4028/www.scientific.net/SSP.197.19 [13] F.J.

The main libraries that were implemented in the CNN model for this study is Keras and Scikit-Learn, in which Keras was used for the structure of the CNN model while Scikit-Learn was used for the machine learning analysis.
The input layer, convolution layer, subsampling or pooling layer, and output layer make up the majority of the structure of CNN as shown in Fig. 1.
The current CNN model has the potential to be better by including other optimization algorithm or improving the structure of the CNN model to get the desired results, which in this case was the tensile strength of the 4D printed parts.
Dou, “Biopolymers; Definition, classification and applications,” Egyptian Journal of Chemistry, vol. 62, no. 9.

Early studies by Ludwig and Woodbury [3, 4] using electron paramagnetic resonance (EPR) were crucial in resolving the hyperfine structure and electron spin states (S) of the 3d-row TMs in silicon.
Early studies provided useful insights on the electronic structure [7, 8, 9, 10] and migration barriers [11, 12] of these TMs, especially those of the 3d row.
Lower-symmetry structures following Jahn-Teller (JT) distortions were also considered, leading in some cases to an energy decrease, mainly within DFT+U.
International Journal of Quantum Chemistry, 114:14-49, 2014