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Properties of steel welded structures depend on many factors such as welding technology, filler materials, and state of stress.
Chemical composition of metal weld deposit could be regarded as a very important factor influencing properties of weld metal deposit (WMD).
In typical low alloy steel weld structure the best mechanical properties correspond with maximal amount of acicular ferrite (AF) in weld metal deposit (WMD) and minimal amount of MAC phases (self-tempered martensite, retained austenite, carbide).
Dobrzanski, Structure and mechanical properties of gradient coatings deposited by PVD techniques onto the X40CrMoV5-1 steel substrate, Journal of Materials Science 43 (2008) 4300-4307
Tański, J Domagala-Dubiel, Unique properties, development perspectives and expected applications of laser treated casting magnesium alloys, Archives Of Civil And Mechanical Engineering 12/3 (2012) 318-326

Results demonstrated that both concrete with DRF and DRFC additives have superior mechanical properties, surpassing the controlled specimens.
Physical and Mechanical Properties Test of DRF Linear density & diameter of DRF.
Additionally, the diameter of the fiber can also affect the tensile properties of the fiber.
Compared to reference samples, concrete samples with DRFC have better mechanical properties.
Hao, "Influencing factors on the healing performance of microcapsule self-healing concrete," Materials, vol. 14, no. 15, Aug. 2021, doi: 10.3390/ma14154139

It is also necessary to analyze and extract useful characteristics of variables from large quantities of data and eliminates the influence of relevant and repeated factors, so as to reduce as many feature dimensions of the samples as possible without affecting solving the problems.
PCA is a method to represent the original multiple variables with several comprehensive factors and make the comprehensive factors reflect as much of the information of the original variables as possible and the comprehensive factors do not relate to each other so as to reduce dimensions.
These comprehensive factors of y1, y2, …, yp are defined respectively as the first, second…pth principal components, and their variaces are degressive.
Case Analysis As data is known[10], we use meteorological factors to predict the occurrence degree of wheat midge.
Dimensions of raw data are reduced by PCA, which not only reduces data redundance but also eliminates influence of the relative factors.

Recently, the increasing usage of carbon fiber reinforced polymer (CFRP) composite appears to be a solution for rehabilitation and strengthening of the concrete structures because of its physical and mechanical properties, such as high strength-to-weight ratio, high corrosion /environmental degradation resistance, and easy to handle during construction.
CFRP has exceptional properties such as light weight, high tensile strength and stiffness and resistance to both chemicals and corrosion, make them particularly suitable for rehabilitation.
Practically, moisture and salinity are the factors that have a great influence on the CFRP strengthening system.
The results also shows that, height and the distance from the sea are the factors which influence in the intensity of attack by chloride ions.
For design requirements based on factors such as the accessibility of the site, project budget and the amount of increase required in the shear capacity the strengthening scheme needs to be selected.

Effects on the Properties of Polyethylene Film Aging by Different Methods Chen Li1,2, ShengLing Xiao 1,2 a 1Northeast Forestry University, Harbin, 150040, China 2Key Laboratory of Forest Sustainable Management and Micro-bioengineering in Heilongjiang Province, Harbin, 150040, China aCorresponding author: shenglingxiao@163.com Keywords: PE film, ultraviolet aging, thermal aging Abstract.
Plastics expose in natural, and their properties are affected by light, heat, oxygen, water and other factors, the surface will appear yellow or crack, the performances are deteriorative and the use life becomes shorten.
Although at the beginning the cross-linking reaction has advantage, but then the cleavage reaction is dominant, finally, the polymer molecular weights reduce so that the mechanical properties decrease[3]. 3.
The results demonstrated that the effect on the air permeability of PE film by ultraviolet aging was higher than thermal aging, aging made the barrier properties dropped down, and the air permeability increased.
Ageing effect on the properties of tri-layer polyethylene film used as greenhouse roof.

The project is due to manholes surrounding backfill not dense , there is no hierarchical compaction required , fillers poor quality , poor moisture control and other factors affecting the compaction effect , caused by too much work for the settlement . 2 sewer project construction quality control points 2.1 Quality control pipe .
Quality control during excavation should take the following points: 2.3.1 Slope Landslide Control First of all, the former location of the pipeline trench excavation by construction patterns in the field put on the line , the excavation methods are manual excavation ( excavation with hand tools ) , mechanical excavation ( excavators excavation ) , should also be adopted in case of lots of rock blasting excavation .
According to soil type , soil mechanical properties to help determine the appropriate slot slope .
Secondly , try to make the mound excavation trench excavation on one side and the other side can be placed transported to drain to be installed , must not allow the drainage ditch was excavated placed side out soil buried. 2.3.2 Control section of the trench slotted wide cross-section from the bottom , deepened , bottom , and between the layers slope gradient layer width and other factors to determine the remaining units .
Tube should be adopted under the crane , the crane should be opened along the trench line and away from the edge of the ditch should be greater than 1m, in order to avoid the trench wall collapsed, affecting the stability of the trench slope.

Introduction Surface tension is the governing factor in all processes of cutting, welding, soldering, and joining.
Due to the fact that material is affected by the thermal-mechanical process, through an interaction with the laser beam, knowledge on stress and deformation analysis for the application and the process of monitoring is ideal.
The equation of mechanical equilibrium is defined as (2)
A decrease of Emat and ρ with depth h is expressed by the attenuation factor cos δ by Equations (11) and (12)
A technological constant KcutL = f (Wlas, vp, p, d) affects the surface roughness, i.e. the surface deformation and the achievable depth of cut and analogously affects the surface tension σsurh.

With the development of numerical methods and computer technology, the mechanical behavior of arch dam under the seismic load can be simulated using numerical simulation method.
In the numerical model, there are many factors that can affect the dynamic response of arch dams such as: reservoir models, nonlinear of transverse joint, absorbability of reservoir bottom, traveling wave effect of seismic waves radiation damping of dam foundation[2].
Since the mechanical property of the base is uniform near the dam foundation, the simplified homogenous foundation is used in the model.
Fig.1 finite element models of arch dam-foundation system (additional mass model) Fig.2 finite element models of arch dam-foundation system (fluid finite element model) Different reservoir models affecting the dynamic characteristics of the dam: The former 8 natural frequencies and vibration modes were calculated using block Lanczos method.
Earthquake analysis of arch dam factors to be considered [C], The 14th world conference on earthquake engineering, Beijing, 2008 [3] Fenves G L, Mojtahedi S, Reimer R B.

Furthermore, quality supervision departments tend to concentrate on furniture amount of strength, stability, formaldehyde, heavy metals, soft and hard covering areas such as physical and chemical properties of the surface when they inspect office space and office furniture.
All the factors above mentioned are all related to users’ physiological and psychological experience and affect their health and safety as well as the product evaluation and purchase.
In addition, it has a good moisturizing quality, steady elasticity, great survivability and no expansion and contraction. 2.4 Material Factors Affecting the Performance of Office Chairs.
The sultry phenomenon caused by adpressed parts of the body with seat is a factor to affect comfort level.
From the related parameters, wool fabrics not only has good moisture absorption properties and heat insulation but also moisture disappears quickly.

In tensile strength test of load perpendicular to the weld axis, the specimens had same tensile properties as that of the raw material.
Compared with the conventional drawing steels, AHSS combines high strength and good formability properties, which make thinner steel sheet to be used possible and practical [1-4].
In this paper, main characteristics of CO2 laser welded 1000MPa grade thin TRIP steel plate, including microstructures and mechanical properties, were investigated.
Tensile properties were tested with the load perpendicular to and parallel with the weld axis at a crosshead moving speed of 5mm/min. on Automated Materials Testing System of Instron.
And porosity fraction of specimen was the determinant factor for the type of fracture likely to be occurred.