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The factors include: temperature, water flow, bioturbation and so on.
Organochlorine pesticide residues in the soil is not only related to the physical and chemical properties of pesticide itself, but also is related to the factors in soil (mechanical composition, content of the organic matter, humidity, type of the crop, pH and Eh), biological factors (microbial communities), climate factors (temperature, humidity and light intensity, etc.) and farming conditions and so on [22, 23].
The factors influencing volatilization rate of OCPs in soils include soil property, physical and chemical properties of OCPs and environmental conditions.
The factors that affect the diffusion coefficient of OCPs in the soil include: bulk density, the adsorption of soil, porosity, water content and physicochemical properties of OCPs.
But the migration and transformation mechanism of organochlorine in the environmental soil and the researches on the factors that affect migration and transformation of OCPs are few.

However, adding up to 20 % results in a steep decrease in the compressive strength due to the densification and space ratio factors in the mortar.
Details of physical properties composition of the RHA used in this study are as shown in Table 1.
Table 1: Physical properties of cement and Perlis rice husk ash.
Combustion temperature and duration are important factors that influence whether silica remains amorphous or becomes crystalline in RHA.
Jeon, “Effect of polymer cement modifiers on mechanical and physical properties of polymer-modified mortar using recycled artificial marble waste fine aggregate,” J.

The size of bore diameter of hollow screw, to some extent, will affect the dual-drive feed system's static stiffness, and then affect the machining accuracy of the workpiece.
However, the size of bore diameter of hollow screw, to some extent, will affect the dual-drive feed system’s static stiffness, and then affect the machining accuracy of the workpiece.
In addition, we employ Structural Static Analysis to process its property and also study the relation between bore diameter of hollow screw and static deformation of the dual-drive system.
In the Workbench, the definition of model parts material properties is defined, as shown in table 3.
Generally, we should take every factor together to design the size of screw bore diameter.

Also the effect of added fluorides on the mechanical properties of final product was monitored.
This fact is probably due to several factors.
All these factors had negative influence on the compressive strength of alkali activated materials.
Unfortunately, the dosage of AlF3∙3H2O to alkali activated BFS affects negatively the compressive strength, therefore the compromise between the mechanical properties and the efflorescence must be taken into consideration.

While water sorption properties is a key factor in mechanical properties and durability of cement-based materials [10-12], the existence of the calcium compounds in the OPC leaves the concrete vulnerable to acid attack.
The physical properties of the WTCRs and natural aggregates.
[9] Mhaya, A.M., et al., Long-term mechanical and durable properties of waste tires rubber crumbs replaced GBFS modified concretes.
[16] Fu, C., et al., Evolution of mechanical properties of steel fiber-reinforced rubberized concrete (FR-RC).
[20] Mhaya, A.M., et al., Evaluating mechanical properties and impact resistance of modified concrete containing ground Blast Furnace slag and discarded rubber tire crumbs.

The key factors of synthesis experiment involving the carbon source, the catalyst and high temperature heat source.
Compared with metal materials, carbon fiber has the characteristics of high strength, high modulus, low density and low coefficient of linear expansion on the physical properties.
Although carbon nanofiber is a new member in the family of carbon materials, it has the excellent properties and has wide application prospects.
But the analysis of main affecting factors can reveal the formation and growth mechanism of carbon nanofiber in the flame.
The key factors of synthesis experiment for carbon nanofibers involving the carbon source, the catalyst and high temperature heat source.

The purpose was to obtain more homogenous crystalline structure of the cast parts, with better mechanical properties.
The mold filling method with molten metal and heat transfer method influences the mechanical properties of the cast parts.
Many researchers have significantly improved and refined the models by incorporating more realistic phenomena, such as [2] and [3] modeled the transient flow phenomena in the mold for the casting process and well investigated the effects of various factors on the turbulence flow state of liquid metal [1].
The physical properties required in equations (1), (3), (5), (6) and (7) used by Comsol are presented in table 1.
The following conclusions have been drawn, after the microstructure analyzes: a) From the grain size point of view, it is observed that the smoother structure appears in the case of die casting followed by the one obtained by investment casting, and the coarser structure is obtained from the sand casting; b) The parts obtained by die casting have the best mechanical properties, followed by the ones obtained by investment casting, and the worst properties have the parts obtained by sand casting; c) In the case of sand casting, after solidification, a dendritic microstructure is obtained, with segregations at the grain boundary which adversely affects the mechanical properties of the piece obtained by this process; d) At investment casting and die casting, silicon crystals are missing from microstructure; By simulating the mold filling method with liquid metal, areas where vortexes appear can be determined, and by appropriate technological methods can be prevented their formation resulting

Setting up the FEM model of a spacecraft catheter connector, analysis its static strength and optimized its structure, Shorten the diameter and reduced the weight of catheter connector, within the requirement of properties.
Constitutive Model of Material Properties and Non-metallic Materials.
The friction coefficient affected by many factors which related to the contact pressure, contact surface roughness, surface texture, etc., need a large number of experiments to study .The friction coefficient of this subject shown in Table 2.
[2] Courtney, T.H: Mechanical Behavior of Materials(McGraw-Hill, USA, 1990)
Cheng: Volume I of Mechanical Design Handbook (NO.4).

Cement: P.O.42.5 ordinary Portland cement is used, and the physical properties are shown in Table 1.
The determination of the input layer node is based on the factors affecting the water retention of concrete.
The influencing factors considered in this paper are: substitution rate, cement dosage, concrete powder dosage, water retention rate, apparent density, age, and six factors.
Research progress on carbonization of recycled aggregate and its influence on properties of recycled concrete,2018，49 (11) : 1147-115
Influence of nano-clay on rheology, fresh properties, heat of hydration and strength of cement-based mortars[J].

The changing of material directly affects the design and manufacturing process.
At last, thermal stress and thermal deformation analysis are presented by taking nonlinear material properties into account, which provide some reference to evaluate the cooling capacity and structure design of exhaust manifold.
The main influence factors of the nodal temperatures are gas temperature and heat transfer coefficient.
Thermal Deformation and Thermal Stress Analysis Considering temperature variation, strain of elastomer is caused by two combined effect factors.
For the shortage of the mechanical properties of the material under high temperature, a fatigue analysis should be proceeded to verify whether the exhaust manifold meets the design requirements.