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Sun YK et al[8] found that the doped Al could reduce electrode dissolution in the electrolyte and stabilize the structure of the material.
The substitution of some Mn-O linkages in the spinel by K-O enhances the stability of the octahedral sites in the spinel skeleton structure.
K entering into the crystal structure lead to amounts of octahedral sites occupied by K+ , the Mn3+ changes into Mn4+, the active materials reduce a lot.
Moreover, the radius of K+ is much larger than Mn3+, which will lead to the deformation at constant volume of the structure and hinder the lithium ion diffusion when charging and discharging.
Journal of Electroanalytical Chemistry, 2008, 624(1): 197-204

Shu Yin Associate Professor Lab. of Environmental Inorganic Materials Chemistry, Center for Exploration of New Inorganic Materials (CENIM), Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai 980-8577, JAPAN.
Staff Scientist Advances in Mechanism theory & Application Mechanism and Robot Transmission Mechanism Mechanical Testing Theory and Technology Mechanical Dynamics Science Mechanical Structure Strength Mechanical Tribology and Surface Technology.
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Synthesis of metallic or semiconducting nanostructures on cellulose has been successfully carried out due to its favorable dimensions, morphology, chemistry and inexpensive production cost of being exploited as a bio-template and reducing agent coupled with the stabilizing properties of surfactants [15, 18-22].
It has been well demonstrated that sonochemistry is a powerful technique for making nano-structures of various materials with novel properties [7, 14].
The nanometric structure and the morphology of the nano-MnO2/NCW composite suspension and MnO2 nanoparticles were observed by Transmission Electron Microscope (TEM, JEM-100CX, JEOL, Japan).
Ruzbehani, Evaluation of the Porosity and the Nano-structure Morphology of MnO2 Prepared by Pulse Current Electrodeposition, Int.
MacLachlan, Free-standing mesoporous silica films with tunable chiral nematic structures, Nature 468 (2010) 422–425

According to Eitel [15], the increase in mesopore volume is caused by the porous structure of the silica gels that are formed during the carbonation.
Chindaprasirt, S.Rukzon, Pore Structure Changes of Blended Cement Pastes Containing Fly Ash, Rice Husk Ash, and Palm Oil Fuel Ash Caused by Carbonation, Journal of materials in civil engineering (November 2009) 666-671
[9] Qi Zhang, Guang Ye, Eduard Koenders, Investigation of the structure of heated Portland cement paste by using various techniques, Construction and Building Materials 38 (2013) 1040–1050
[13] Parrott, L., Moisture conditioning and transport properties of concrete test specimens, Materials and Structure, 27 (1944) 460-468
Sereda, Mechanism of the carbonation shrinkage of lime and hydrated cement, Journal of Applied Chemistry, Vol.18, Issue 4 (April 1968) 111-117

It is well-known that the influential factors for the reinforcing fillers are the particle size, particle structure and surface chemistry.
In other words, particle size is partially determined the characteristic of surface activity and structure of the pigment, the smaller the particle size is, the stronger chemical nature for the surface, and the more easy to form an aggregated structure19.
Experimental Materials Butadiene rubber (BR9000) that the cis-1,4 structure content was 98.8%, which was produced by Qilu Petrochemical Company (China).
Hence, this hinders the rubber molecules to form the network structure.
More importantly, when filled with the particle size of MgO below 50 nm, resulting in a great increase of G＇, while the G＇decreased sharply as a strain increasing to a certain value compared with that of BR filled with the particle size of MgO exceed100 nm, indicating that there was filler network structure existing in BR/MgO composites, this phenomenon was known as Payne effect 23.It can also found that the difference among G＇of those BR/MgO composites filled with the particle size of MgO exceed100 nm were very little, and the value of G＇decreased slightly with the increasing of the strain, indicating that the Payne effect was not evident.

The researcher confirmed that the performance of polymer nanocomposites strongly depends on the types of CNTs (SWCNTs or MWCNTs), morphology of CNTs, the choice of matrix, processing step, structure (length, diameter and chirality), the interfacial interaction and CNTs dispersion within the polymer matrix [11].
These shorter lengths of SWCNTs have been used as a starting material for further chemical modification toward its functionalization that can changed the properties of SWCNTs including the dispersing property and the band structure [13,14].
These process have break the agglomerate structures in aqueous and non-aqueous suspensions that allow the full potential of CNTs [17-21].
Functionalized CNTs are solvated as individual tubes, which make it possible to carry out further solution chemistry [17].
Bang, Smart Materials and Structures based on Carbon Nanotubes Composites, in: www.intechopen.com, p. 371-375

Moreover, fine needle-like structures are observed in the equiaxed grains of sintered Ti-10Mn regardless of the sintering temperature.
On the other hand, in the case of Ti-14Mn, only the specimen sintered at 1473 K shows needle-like structures in the equiaxed grains.
However, small amounts of these structures are observed near the grain boundaries of the equiaxed grains in Ti-14Mn specimens sintered at 1373 and 1423 K.
These results indicate that the equiaxed grains present in sintered Ti-10Mn and Ti-14Mn belong to the b phase and that the needle-like structures observed in the equiaxed grains of sintered Ti-10Mn belong to the a phase.
Moreover, although the XRD profile of sintered Ti-14Mn does not show any diffraction peaks corresponding to the a phase, the small amount of needle-like structures observed near the grain boundaries of the equiaxed grains in specimens sintered at 1373 and 1423 K are estimated to belong to the a phase.

Introduction Additive manufacturing also refer as 3D printing technology enables us to make extremely complicated geometries and structures which are hard or impossible to create in traditional manufacturing processes [1].
Understanding these attributes is essential for optimizing the design and suitability of 3D printed structures for applications where impact loading is a common occurrence [3].
The pattern of infill can also influence the distribution of impact forces within the structure.
A study on the influence of particular printing settings, e.g., temperature and layer height and infill structure, on impact resistance.
P, “Bio-based and biodegradable polymers - State-of-the-art, challenges and emerging trends,” Current Opinion in Green and Sustainable Chemistry, vol. 21, pp. 75–81, Feb. 2020, doi: 10.1016/j.cogsc.2019.12.005

The system also can optimize structures of neural network and train it on additional data set to increase recognition capability.
The majority of eukaryotic genes display a complex structure in which code for protein are interrupted by intervening, non-coding sequences.
Therefore, we can consider a complex structure in which code are interrupted by intervening, non-coding sequences.
A structure of each network is selected from a predefined domain.
Matsuo et al.: Biological Chemistry Hoppe-Seyler Vol. 375 (1994), p. 675 [24] S.

The advantage of this method could omit the huge middle-colder and relative system, and simplify the structure of gas-turbine.
Discussion and Conclusion Combustion is essentially a chemistry reaction under a given temperature region.
But this method would destruct flow field, make the structure and process control of turbine more complicated and occur partial overheat region.
The structure of turbine blades is displayed in Fig.9.
These need research systematically in serial problems such as: turbine structure, blade air-film defense, flow field and temperature field and process control.