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Changes in bone quality in idiopathic individuals can also alter the bone's mechanical properties and anatomical structure.
Spondylolisthesis, a chronic vertebral column instability form, ranks among the most prevalent conditions affecting the lower spine.
Moreover, factors like thread pitch, depth, and thread form also notably impact pullout resistance [13].
Furthermore, bone strength and bone mineral quality play a critical role in determining the strength of the pedicle screw-bone interface, consequently affecting the screw's movement toward the bone interface.
Wu, Biomechanical properties of novel transpedicular transdiscal screw fixation with interbody arthrodesis technique in lumbar spine, finite element study, Journal of Orthopaedic Translation 15, 50-58, (2018)

This situation makes engineering staffs hope to get a model, which can use the basic physical and mechanical properties of loess parameters to calculate the coefficient of collapsibility of loess, and which is practical and correct on theory.
The discussion of affect factors of collapsible loess Loess was incompact soil and deposited in dry and cold climates.
Only when the CaCO3 in loess as cement, it will affect the collapsibility.
Other factors, such as clay content is also the important factors influencing the collapsibility of loess, but because of it is not common parameter in engineering soil test, considering the simplification of model ,the clay content is not considered.
In addition, the loess natural density and dry density are also very important factors, but the density of loess is relate to its dry density and water content, and water content has already been considered.

If the carbon fiber was insert into concrete, which can effectively improve the tensile properties of concrete.
The crack resistance effect is affected by many factors.
British Journal of Applied Physics.1952.3.72 [4]K.Nishioka,S.Yamakawa,K.Shirakwa, Properties and Applications of Carbon Fiber Reinforced Cement Composites.
Influence of tensile strength of carbon fiber reinforced concrete factors analysis [J].
The Experimental Study on Mechanical properties of Carbon Fiber Concrete [J].

The presence of gas in steel is a problem in terms of quality, by the way how is influenced steels mechanical and technological characteristics.
Current steel making technology allows inclusion of gas content at relatively low value, but under current conditions, it places a great emphasis on the purity of the steel and the superior mechanical and technological properties, secondary treatment is required (ladle metallurgy) and, if possible, even the treatment of liquid steel in vacuum installations.
The negative influence of the hydrogen in the steel is manifested by the following: - it is one of the causes of blowholes and shadows lines appearance in ingots and kill steel castings parts; - contribute to the occurrence of the defect called "flakes" in rolled steel (very small cracks of stellar form) from steels alloyed with chromium and nickel, which substantially reduces the fatigue strength of steel parts; - affect the electric and magnetic properties of steels.
Fig. 1 The amount of nitrogen removed according to the duration of the treatment under vacuum or under high vacuum To take account of two correlation factors, in Fig. 2 is presented the variation of nitrogen removal efficiency (hN), depending on vacuum process duration, respectively high vacuum process.

For formulate loose blasting program and select the blasting parameters Accurately, first of all, we must sample and test the roadway rock and the roof rock mechanical properties , the measured results shown in Table 1.
The blast-hole depth should be considered the higher the efficiency of drilling and a good blasting effect, drilling equipment and the level of construction technology, labor organizations, and other factors, but also to facilitate the construct organization and management.
Blast - hole layout shown in Fig.1. 4 Charging Structure After the holes parameters and explosives species are identified, the charging form and related parameters is an important factor affecting the blast effect.
When the blast hole block length is too short, the plug material will out of the blast holes prematurely , so that the detonation gas would not achieve the "gas wedge", affect the blasting effects; When the plug material is too long, it will not only increase the workload of blockage, affect the speed of construction but also will lead the cracks cannot reach to the orifice rock, so orifice rock cannot reach the purpose of loosening, so mechanized mining machine does not work, affecting the normal production of coal.
(2) Detonating sequence affect the loose blasting effect.

Although AZ91 alloy offers a good combination of mechanical properties, it is unsuitable for use at temperatures above 120 °C due to its poor creep resistance and its large decrease in strength at elevated temperatures [5].
Despite the enormous role of the various factors of the constituent phases, however, mechanical behavior of Mg alloys has not been investigated based on the concepts of two-phase materials.
However, different microstructural features between squeeze and die cast alloys such as grain and particle sizes will affect the tensile and creep properties differently [8].
Tensile and Creep Properties.
The room temperature tensile properties are shown in Fig. 3.

Surface roughness is an important product quality since it greatly influences the performance of mechanical parts as well as production cost that give impact on the mechanical properties (fatigue, corrosion, creep life, etc.) and other functional attributes of parts (friction, wear, heat transmission, lubrication, etc.) [3].
An unfavourable phenomenon encountered in various machining processes occurrence can be critical as it affects MRR, geometrical accuracy, and surface finish of the workpiece.
Table 1: Experimental parameters Controlled Parameters Experimental Conditions Levels Variable Parameters Factors I II III Spindle Speed (rpm) A 30000 40000 50000 Feed Rate (mm/min) B 1 2 3 Depth of Cut (µm) C 20 30 40 3 RESULTS AND ANALYSIS Surface Roughness (Ra) Table 2: Mean S/N ratio values of surface roughness Control Factor Level surface roughness Factors I II III Max-Min Rank Spindle Speed (10 3rpm) A 17.8437 17.9102 13.5413 4.3689 1 Feed rate (mm/min) B 16.0207 16.5465 16.7279 0.7072 3 Depth of cut (μm) C 16.8079 16.4595 16.0277 0.7803 2 Table 2 show spindle speed is the most significant factor that effected on the surface roughness followed by the depth of cut and feed rate.
Besides, the P-values of other factors B also have confidence level of more than 99% which shows that this factor has a strong influence on MRR.
International Journal of Mechanical and Material Engineering, 4(1), 93–97.

To fulfil this function, cladding must have good thermal and technical properties.
This achieves the optimum ratio of expended financial costs for revitalisation and improvement of the thermal and technical properties of the structure.
The thermal and technical properties of the building envelope have a significant influence on the energy performance of the building.
This is a decisive factor affecting both finances and environmental protection.
It is dependent on many factors, such as weather conditions, quality of maintenance or manner of use.

It has unique physical and chemical properties because of its special structure.
This was due to the thermal conductivity of graphene oxide is smaller than that of graphene, and the structural defects occered in the process of oxidation, directly affecting the transfer of heat along the two-dimensional plane .
Studies showed that there were some differences in properties of graphene product which obtained by the different method.
The current findings indicate that graphene nanofluids can significantly improve the heat transfer properties of nanofluids, thermal interface materials and thermal conductive composite materials.
Jiang, Factors affecting thermal conductivity of epoxy thermal interface composite containing graphene nanoplatelets, Materials and Design, submited [21] W.

The two factors responsible for the electrical and magnetic properties of prepared ferrites are sintering conditions [3] and method of preparation [4].
It is known that the desired, technologically speaking, properties of ferrites depend on a careful optimization of factors, such as bulk composition, purity, microstructure, divalent iron and/or oxygen stoichiometry and an adequate control of the corresponding homogeneity.
Previous works showed that the grain size is one of the most important parameters affecting the magnetic properties of ferrites [13].
It can alter the cation distribution to a greater extent which is deciding factor in determining the overall magnetic properties in the nanoregime.
The presence of Mn3+ and Fe2+ in octahedral site leads to Jahn–Teller distortion which affects the magnetic properties in manganese containing ferrite [47].