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When the humidification reached 250mL/h, the spinning process was adversely affected and quality of yarn decreased.
It was revealed that the moisture treatment improved the friction properties, conductivity and flexibility of the fibers.
Table 1 Parameters in the spinning process Yarn number[tex] Twist factor[α] Roller gauge Drafting ratio at back zone Spindle speed [r·min -1 ] 22.5 390 18*28 1.15 5000 Equipments Fig. 1 Schematic diagram of the humidification device The schematic diagram of the humidification device is shown in Fig. 1.
Yarn hairiness The yarn hairiness was measured by using the Model YG172 hairiness tester (Textile Mechanical & Electrical Co., Ltd.
Yarn comprehensive quality Many factors were involved when evaluating the yarn general propertied.

Optimization of Surface Roughness Based on Multi-linear Regression Model and Genetic Algorithm Pan Yongzhi1, a, Zhao Jun 2, b, Fu Xiuli1, c and Ai Xing2, d 1 School of Mechanical Engineering, University of Jinan, Jinan, China 2 School of Mechanical Engineering, Shandong University, Jinan, China a yongzhi.pan@gmail.com, bzhaojun@sdu.edu.cn, cme_fuxl@ujn.edu.cn, daixing@sdu.edu.cn Keywords: helical angle; high-speed milling; surface roughness; genetic algorithm.
Introduction Surface roughness is a measure of the technological quality and a factor that greatly influences manufacturing cost, which describes the geometry of the machined surface and combined with the surface texture.
There are many parameters affecting surface roughness, such as cutting conditions, tool geometries, tool wear and material properties and so on.
Numerous investigations concerning the influences of cutting conditions, tool geometry and material properties on surface roughness have already been reported.
Summary In the high-speed milling process of 7050-7451 aluminum alloy, the axial depth-of-cut, the radial depth-of-cut and helical angle are the major factors affecting surface roughness of workpiece.

Introduction The oriented hydroxyapatite (OHA) has been widely used as implants for bone-repairing and tissue engineering scaffold due to its special properties.
The two major factors were investigated experimentally.
It was reported that the impacts of anionic substituents in HA on the structure and properties of natural and synthetic calcium apatites are obvious.
Temperature is an important factor affecting the oriental growth of HA.
SEM micrographs of obtained HA synthesized at (a) 40 ℃; (b) 70 ℃ Conclusion Both temperature and aging are two major factors that influence the oriental growth of HA crystal in preparation.

Good lubricants constantly depend on the chemical composition and mechanical properties. 
Indeed such wear laws were generally implemented in models with different characteristics (e.g. geometries, material properties or kinematic/loading conditions), so their results are not easily comparable.
The palm olein and kernel film layer on the contact as the main factor affected reducing wear and frictional rates.
Friction and wear properties of micro textured DLC coated surfaces in boundary lubricated sliding. 
Lubrication properties of trimethylolpropane esters based on palm oil and palm kernel oils. 

Factors Influencing the MTC and its realization methods have always been of concern to many researchers.
Afterwards, they used molecular dynamics simulation method to study the MTC and the influencing factors.
Yuan and his colleagues using diamond cutting tool to machine aluminum alloy material suggest that the MTC has a relationship with edge radius, material properties, the cutting process and so on[3].
It pointed out that the MTC is related to the actual cutting parameters and changes with edge radius, the cutting parameters, and the material properties.
The DMTC Effect on the Surface Quality There are many factors affecting surface roughness, such as specific processing parameters, surface residual height, the MTC, elastic recovery, different phrases of burr height, and so on.

The mould's design depends not only on the geometric shape of parts but also on the thermal properties of the flow material and mold material.
DOE is an efficient technique that requires lesser experimental trials and estimates individual and interaction factors [42-44].
The effect of injection molded factors on the quality of parts (i.e., surface roughness) is presented in Fig. 1.
Parappagoudar, Study of the effect of nano-silica particles on resin-bonded moulding sand properties and quality of casting, Silicon. 10(5) (2018) 1921-1936
Gudiño, Morphological and mechanical properties of bilayers wood-plastic composites and foams obtained by rotational molding, Polymers. 12(3) (2020) 503

Its properties depend on the nature of mechanical forces in addition to the location as well as the age, sex and race of the subject.
The results indicate that bone minerals vary with different factors, the structure and chemistry of bone mineral and related synthetic and mineral apatite's.
Previous studies have shown that trabecular bone mechanical properties are affected by its non uniform mineral distribution [5].
This non uniformity distribution will affect the apparent stiffness of cancellous bone.

The eutectic microstructure determines the mechanical properties of the Al-Si alloys because eutectic phase contains a hard, brittle silicon phase in a softer α-Al phase.
Therefore, controlling the eutectic silicon morphology by modification had been extensively used in industry to improve the mechanical properties of the castings.
A significant quantity of research work has been conducted in recent years to study the efficiency of various modifier elements such as Sr, Na and Sb on microstructure and mechanical properties of cast and semi-solid A356 alloys.
Abdulkhalek, Effect of microstructure on the mechanical properties and fracture of commercial hypoeutectic Al-Si alloy modified with Na, Sb and Sr, Journal of Materials science 34 (199) 3555-3564
Kori, Effect of a grain refiner cum moidifer on mechanical properties of Al-7Si and Al-11Si alloys, Met.

The mechanical properties are the next topic of research.
Wettability is a further crucial factor.
The surface energy would change with the addition of fillers and reinforcing particles, affecting the solder's wettability.
Abdraboh, Thermal and mechanical properties of Sn-Zn-Bi lead-free solder alloys, J.
Lin, Microstructure and Mechanical Properties of Sn-8.55Zn-1Ag-XAl Solder Alloys, Mater.

Aluminum is widely used for the automotive parts, the aerospace pats, and the mechincal parts due to its properties such as the light weight, the high ductility, and the rust resistance.
The ball-end milling process is one of the most important processes which are widely used to produce the mechanical parts.
There are many factors affecting to the surface roughness of the machining parts.
It is known that the cutting conditions affect the surface roughness [5].
As the Box-Behnken design has fewer design points so this design is less expensive to run than central composite designs with the same number of factors.