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Factors that allow for a narrow frequency range include the characteristics of the pores and the stability of the material.
Hassan et al., “Factors Affecting Acoustic Properties of Natural-Fiber-Based Materials and Composites: A Review,” Textiles, vol. 1, no. 1, pp. 55–85, 2021, doi: 10.3390/textiles1010005
Birkett, “Effect of Varying Mixing Ratios and Pre-Heat Temperature on the Mechanical Properties of Polyurethane (PU) Foam,” Procedia Eng., vol. 132, pp. 701–708, 2015, doi: 10.1016/j.proeng.2015.12.550
Tiuc et al., “The analysis of factors that influence the sound absorption coefficient of porous materials,” 2014
Kremensas, “Bio-based polyurethane composite foams with improved mechanical, thermal, and antibacterial properties,” Materials (Basel)., vol. 13, no. 5, Mar. 2020, doi: 10.3390/ma13051108

The distribution of temperature and porosity could be used for more precise calculation of internal stresses in cast component under loading conditions with respect to the structural factors.
There are many applications of cast super-invar components in axisymmetric assemblies because as-cast microstructure of the alloy ensures macroscopic isotropy of mechanical properties [7] over the volume.
Such information could be used afterwards for more precise prediction of internal stresses in cast component under loading conditions with respect to the structural factors.
Modelling of Grain Structure The growth morphology and scale of microstructure in a casting process are directly related with the macroscopic mechanical properties of the final product.
The calculated grain parameter together with dendrite arm spacing influence on mechanical properties of cast alloys owing to variation in growth conditions during radial solidification of cylindrical casting.

These stresses can be caused by various factors, intrinsic to the material such as variations in density or volume, densification or surface oxidation, and extrinsic factors such as thermal or thermoplastic deformations generated during cooling step of the sintering program [6].
In order to induce different magnitudes of residual stresses and verify its effect on the mechanical properties, the content of zircon-alumina in suspensions was varied.
Finally it is necessary to know the mechanical properties which have the multi-layered components by combining different layer formulations and verify if them have better mechanical properties, also Table 1 shows the results obtained.
Table 2 shows the mechanical properties obtained in the designed multi-layered materials, it is important to note that materials that had better mechanical properties were those with compressive residual stresses in thick layers and tensile in thin layers, while the materials having tensile residual stresses in thick layers and compression in thin layers present very low mechanical properties, that are so far to improve the mechanical properties.
Properties of multilayer materials.

Sb-doped Heusler Fe2VAl alloy was synthesized to evaluate the effect of heavy element doping on thermoelectric properties of the Heusler alloy.
The effect of the additional substitution on thermoelectric properties was investigated.
In contrast to the electronic properties, the additional Ti-substitution has little effect on the κ value.
Finally, ZT value was calculated from measured thermoelectric properties (Fig. 7).
Jones: The Theory of the Properties of Metals and Alloys (Clarendon Press, Oxford, 1936).

The microstructure of carbon fibers with different properties also varies.
Even with considerable mechanical properties, the microstructure characteristics of carbon fibers produced by different manufacturers or processes are different.
In recent years, many researchers have conducted in-depth analysis of the load-bearing mechanical properties of carbon fibers based on this model.
The mechanical properties of carbon fibers, such as strength and modulus, are related to these defects.
By eliminating defects, the mechanical properties of carbon fibers can be effectively improved.

Among them, fibre-reinforced thermoplastics have received particular attention due to their lightweight nature, enhanced mechanical properties, and cost-effective manufacturing, making them especially attractive in aerospace and infrastructure sectors [6,7].
Although the overall geometry is identical, the layer structure introduces differences in thermal and flow histories, potentially affecting morphing response.
However, this duration slightly varied depending on environmental factors such as room temperature and airflow.
This behaviour aligns with the thermal properties of the constituent materials.
Mehrdad, "Shape memory and mechanical properties of cross-linked polyethylene/clay nanocomposites," European Polymer Journal, pp. 2856-2865, 2007

Indeed, two conflicting factors are known to affect cordierite formation.
In case of cycles A and B several dwell times at different temperatures were investigated both during heating and cooling in order to determine their effect on the properties of the sintered bars.
Physical and mechanical properties data of the sintered cordierite bars.
Shafer, Preparation and properties of mullite-cordierite composites, Ceram.
Saito, Mechanical properties of alkoxy-derived cordierite ceramics, J.

In addtion, it is one of the main control factors to hydrocarbon migration, accumulation and preservation.
With the further understanding, Scherer et al.came to realize that there are many factors affecting strata porosity variation, and depth is just the more important one of factors[7-10].
Liu(2007) deduced porosity dual function, depth and time as variable factors, from the visco-elastic stress-strain mode(Bingham model) under the conditon of constant speed burial[14].
Characteristics and causes of sandstone porosity evolution The influence with sandstone reservoir properties always attributes to compaction, cementation and dissolution.
Quantitative researches would solve dynamic problems in hydrocarbon accumulation, and relate different accumulation factors with accumulation process organically.

Many factors affect cold resistance.
Physicomechanical and thermophysical properties of metals.
[9] Properties of elements: Reference book.
Physical properties.
Physicomechanical and thermophysical properties of metals.

The above said nature of the reinforcements, promotes the bonding strength and mechanical properties.
Multiple ceramic particles reinforced composites are developed to achieve the combination of properties that are not available in a single ceramic material [13].
Analysis of variance is employed to identify the significant factor which is affecting the surface roughness during machining.
Table 1 Level of factors Factors Levels Discharge current (Amps) 10 11 12 Pulse on time (µs) 50 100 200 Flushing pressure(Kg/cm2) 0.3 0.4 0.5 Experimental work Spark erosion type electrical discharge machining with model 150 is used for this experimental work.
Zeng, B.Yang and Q.Li: Microstructure and mechanical properties of in-situ Al- Cu/TiC composites: Journal Materials Science Technology Vol 14 (1998), p.255- 258