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Quartz belongs to the hard and brittle materials, which has the characteristics of high strength, not conductive, low fracture toughness and high hardness [1].
Considering the chemical etching processing principle of the quartz materials and the existing processing technology, HF, HF+CH3COOH, NH4HF2 and NH4F+HF dissolved solution are currently used.
References [1] Yundian Zhang, Machining technology of hard and brittle materials (Science Press, China 2011).
Journal of Vacuum Science \& Technology A. 1993, 11(4): 763-767
Journal of chemical physics. 2002, 116: 275-280

Different aspects of storage such as materials, PCM container, heat transfer, enhancement technology innovation have been examined.
Corresponding Author Yongqi Xie is working at the School of Aeronautics Science and Engineering, Beihang University, China.
Dutta, A numerical model for heat sinks with phase change materials and thermal conductivity enhancers, International Journal of Heat and Mass Transfer. 49 (2006) 1833-1844
John, Phase change heat transfer enhancement using copper porous foam, Journal of Heat Transfer. 130 (2008) 082301-1-082301-11
Wu, Heat transfer enhancement of high temperature thermal energy storage using metal foams and expanded graphite, Solar Energy Materials & Solar Cells. 95 (2011) 636-643.

It was observed that PBS/NR composites are green-composites or eco-materials.
The development of biodegradable polymeric materials has been a subject of great research challenge in materials science.
Experimental part Materials.
These results show that PBS/NR composites are environmentally friendly and degradable materials that can be considered as alternatives to non-biodegradable plastic materials for applications.
Journal of Polymer Science Part B: Polymer Physics 2000, 38, 525-536

Meanwhile, it enjoys advantages like high tenacity, high strength, high insulation and high dielectric constant; therefore, it has been widely used in insulation materials, fiber protection and reinforcing materials, etc.
Preparation of the Polycrystalline Alumina Fubers by Sol-gel Progress [J].Journal of Xiamen University (Natural Science).2006, 45(3):375-378
Fabrication and Characterization of Mono-Dispersed Al2O3 Powders [J].Journal of Aeronautical Materials.2006, 26(4):96-99
New Chemical Materials.2004, 32(7):13-15
Preparation of Alumina as a Raw Material of Phosphor and Controlling of Its Particle Size and Shape [J].Journal of the Chinese Ceramic Society.2004, 32(4):393-397

Although many crystalline materials require only quadric and cubic IFCs to define lattice thermal conductivity, extracting beyond cubic IFCs is needed for highly anharmonic materials.
Wang et al., A mixed-space approach to first-principles calculation of phonon frequencies for polar materials, Journal of Physics Condensed Matter. 22 (2010)
Miyazaki, Heat conduction in nanostructured materials, Journal of Thermal Science and Technology. 11 (2016) 1-15
Giannozzi et al., Quantum espresso: A modular and open-source software project for quantum simulations of materials, Journal of Physics Condensed Matter. 21 (2009)
Tanaka, First principles phonon calculations in material sciences, Scripta Materialia. 108 (2015) 1-5

Introduction Methylammonium Lead Iodide (MAPbI3) is one of the most fascinatingly promising perovskite materials in the photovoltaics and material science field of applications.
Since 2009, the researchers had a great interest in the perovskite materials as a result of its high efficiency as a photovoltaic material [4-7] such as its easy fabrication, low price, tunable bandgap, high carrier diffusion of speed and length, and high Power Conversion Efficiency (PCE) due to its high absorption [8, 9].
Bonadio et al., "Entropy-driven stabilization of the cubic phase of MaPbI 3 at room temperature," Journal of Materials Chemistry A, vol. 9, no. 2, pp. 1089-1099, 2021
Giannozzi et al., "QUANTUM ESPRESSO: a modular and open-source software project for quantum simulations of materials," vol. 21, no. 39, p. 395502, 2009
Liu et al., "Role of organic cation orientation in formamidine based perovskite materials," vol. 11, no. 1, pp. 1-10, 2021

l The fineness of coal gangue The reaction materials can be provided with interface area microwave field interaction, and contact degree of the sample between the components has great influence on the microwave absorbing ability of reactants and reaction.
Because the microwave activated coal gangue could transfer heat from the strong microwave absorbing materials.
Acknowledgements This work was financially supported by the National Natural Science Foundation （51264017）.
Microwave irradiation activated coal gangue cement system test on [J]. materials review.2011,25 (17): 474 [2] Wenzhong Wang.
Beijing: Science Press,.1999,10 [7] Zhiman Zhao,Heming Cheng.

In recent years, stepwise graded materials, where the material properties vary gradually or layer-by-layer within the material itself, were utilized as a core material in sandwich composites.
Alρ is density of base material of aluminum foam.
Simitses: Journal of Applied Mechanics - Tansactions of the ASME Vol.75(2008), p.125 [4] G.J.
Fleck: European Journal of Mechanics - A: Solids Vol.25(2006), p. 215 [5] Erheng Wang, Nate Gardner, Arun Shukla:International Journal of Solids and Structures Vol.46 (2009), p. 3492 [6] P.J.
Li: Journal of the Mechanics and Physics of Solids Vol.53(2005), p. 2174

At the present time, the most widespread approach to the description of geological materials is based on the usage of internal variables.
Using this model enables deriving constitutive equations for a wide range of geological materials with various structures (rocks, loose materials, soils and etc.) [13,14].
Evaluating the residual life of salt pillars // Journal of Mining Science. 1998. – vol. 34. - Issue 1. – p. 14-20
Stability assessment of interchamber pillars // Journal of Mining Science. 1997. – vol. 33. - Issue 1. – p. 23-30
Discrete element modeling of rock failure dynamics // Journal of Mining Science. 2012. – vol. 48. - Issue 1. – p. 96-102

It is used for damage detection of materials [1], process control [2], flows of various materials in pipes [3], mixing processes [4], geophysical inspection [5] and in medicine [6].
Further in the paper we deal with this problem choosing special materials instead of water.
When compressibility and flexibility are required, foam materials made of flexible materials, such as rubber, neoprene, polyurethane or textile materials, can be considered.
Pambaguian, et al., Damage identification in carbon fiber reinforced polymer plates using electrical resistance tomography mapping, Journal of Composite Materials 47 (2013) 3285–3301
Salama, A Comparative study of medical imaging techniques, International Journal of Information Science and Intelligent System 4 (2015) 37-58