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Kanchev”, Ruse, Bulgaria 2Institute of Electronics, Bulgarian Academy of Sciences, Sofia, 3Institute of Metal Science, Equipment and Technologies with Hydro- and Aerodynamics Centre, Bulgarian Academy of Sciences, Sofia, Bulgaria a*mpnikolova@uni-ruse.bg, bstsvalkov@gmail.com, cst.parshorov@gmail.com, deyankov@uni-ruse.bg, epeterpitiv@gmail.com Keywords: biocompatible coatings; hierarchical structure; TiO2; TiN; SBF; corrosion.
The surface morphology and chemistry of the samples was investigated by using scanning electron microscope (SEM - LYRA I XMU, Tescan) equipped with energy dispersive spectroscopy (EDS – Quantax 200, Bruker) under an accelerating beam voltage of 20 kV.
Biological aspects and structure formation.
Yamamuro, Solutions able to reproduce in vivo surface-structure changes in bioactive glass-ceramic A-W, J.

The centre of Lima has a large number of historic structures with a ground floor in adobe, and their upper storeys in quincha, a traditional technique consisting of a timber frame with an infill of canes and mud.
The objective of the present study is to produce a reliable strategy for numerical modelling of these structures, supported by validation against accurate in situ surveys and experimental work.
An approach has been taken to investigate each component of the composite structure in detail, alone and in combination with other components to determine the most significant parameters and their contribution to the overall behaviour.
Timber Structures: Rotational stiffness of carpentry joints. in 9th World Conference on Timber Engineering. 2006.
Mathematics, Physics and Chemistry 4. 2000. p. 417-424.

Simple structure, low cost, high level of test automation are its characteristics.
Introductions Today, the science and technology is highly developed, and a large number of technical problems in weak signal detection are existed in scientific research, production, national defense, biomedicine, chemistry, physics, and many other fields.
The system structure diagram is shown in figure 1.
Fig. 1 The system structure diagram LM358 op-amp circuit is adopted to the low noise preamplifier in this circuit.
The while loop structure is used in the design of the background panel, because the cyclic processing is requested in the analysis of signal.

The results show that the prepared CNTs/MgAl-LDHs exhibit a three-dimensional honeycomb structure with a specific surface area of 103.019 m2/g, which is larger than the specific surface area of MgAl-LDHs of 84.344 m2/g.
As can be seen from Fig.1a, Mg/Al-LDHs has a hexagonal structure with a smooth surface and complete crystals with a size of about 6 μm.
As can be seen from Fig.1b, the carbon nanotubes are uniformly attached to the surface of the hydrotalcite, and the CNTs/MgAl-LDHs exhibit a three-dimensional grade honeycomb structure.
The peak indicates that the sample has higher purity, single crystal phase and complete structure.
Conclusion The one-step hydrothermal synthesis of magnesium aluminum hydrotalcite and carbon nanotube composites has a good void structure and a high specific surface area.

The X-Ray patterns show that Gd3+-Gd3+ ion coordination units and tungstate zigzags constitute the main structure of the host material, and they are isolated by the [WO4]2- groups.
Fig. 1 (b) presents the schematic diagram of three-dimensional (3D) of Li3Ba2Y3(WO4)8 indicates the fact that the samples have a monoclinic structure with the space group C2/c [10-12].
Seo, Optimization of Yttrium Aluminum Garnet:Ce3+ Phosphors for White Light- Emitting Diodes by Combinatorial Chemistry Method, J.
Wang, Growth and structure of Nd3+-doped Li3Ba2Y3(WO4)8 crystal with a disorder structure, CrystEngComm, 12 (2010) 1307–1310
Wang, Growth, structure and spectroscopic characterization of a new laser crystals Nd3+:Li3Ba2Gd3(WO4)8, J.

The structure of P(MEO2MA-co-OEGMA300) was confirmed by 1H NMR and GPC.
Results and discussion Characterization of structure and properties.
The structure of polymer was investigated by H1NMR.
The molecular structure of P(MEO2MA-co-OEGMA300) was confirmed by 1H NMR.
Smart Materials and Structures. 21 (2012) 053001

Crystal structure and surface morphology of graded PST thin films were characterized by X-ray diffraction (XRD) and atom force microscope (AFM).
Some dopants including Mg2+, Ni2+, Mn2+, Co2+, Al3+, Cr3+, and Bi3+, which can occupy the B sites of the (ABO3) perovskite structure and behave as electron acceptors, have been known to lower dielectric loss [14, 15].
The crystal structures of undoped and 6 mol % Fe-doped PST powders are cubic phase and no second phase appears, which implies that the dopants have entered the unit-cell maintaining the perovskite structure of the solid solution.
The XRD pattern showed PST powder was pure perovskite structure without any other second phase and Fe doping depressed the crystallinity of PST.
Kim, II, Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures.

Calcined HTLCs (CHT-X) at 500°C have been shown to recover their original layered structure by taking up chloride ion from aqueous solution.
Their structure can be derived from the layered mineral brucite Mg(OH)2, in which Mg2+ is located in the center of an edge-sharing octahedral surrounded with hydroxyls.
The so-called “memory effect” means that the resulting material is an atomic mixture of metal oxides which can take up anions from aqueous solution to recover its original layered structure.
And it also could be seen from SEM image that the HT-X synthesized in this study exhibits clear layer structure.
The layered structure reconstruction was observed after chloride adsorption (CHT-4-A), indicating that the chloride was adsorbed onto the positive layer and formed the negative layer.

. % dispersed easily and enhancing the crystallinity structures and mechanical properties of PLA composites.
Morphology of PLA and composite films were examined by optical microscopy, chemical and crystal structures of composites are analyzed by (ATR-FTIR) spectroscopy and XRD techniques.
As result the existence of ZnO particles did not change the semi-crystalline nature of PLA structure.
This result was confirmed by XRD technique which showed an increase of diffraction planes (1 1 0 / 2 0 0 and 2 0 3) positioned at 19.5 and 22.5 °C from crystalline structure of Polylactic acid composite films.
Wen, One-pot route to graft long-chain polymer onto silica nanoparticles and its application for high performance poly(L-lactide) nanocomposites, The Royal Society of Chemistry 9 (2019) 13908-13915.

With increasing the flow rate, a transition from columnar to spherical structure is formed.
Fig. 8 (a~f) the plan view (a) of the film and the cross-sectional view of the films under 10 sccm (b), 20 sccm (c), 30 sccm (d), 40 sccm (e), 50 sccm (f) A structure zone model(SZM)[20] was proposed recently for structure evolution of the nanocomposite films.
On account of the structure changing by simply altering the inlet gas flow rate rather than traditional method of substrate heating which limited the category of the substrate, this method can be used more widely for obtaining the various structure of the Ni/α-C:H films.
A film structure evolution from columnar to spherical is occurred with increasing the C2H2 flow rate.
[18] H.W.NESBITT, D.LEGRAND and G.M.BANCROFT: Physics and Chemistry Minerals, Vol.27(2007),p.357