Search results

Due to the fact that the kinetics of the rate of the chemical reaction at the interface is greater than the rate of solid-phase diffusion, the conditions and factors that ensure its occurrence are considered [10].
We see from (1) that the redistribution of nitrogen during nitriding directly depends on the diffusion coefficient and affects the diffusion time.
Experimental and tabular data for the pre-exponential factor are known.
[5] Heat Treatment Optimization and Nitriding Effects on Mechanical Properties of 32CrMoV12-10 Steel Fatih DEMİR1, Muhammed Bora AKIN1, Ahmet YARTAŞI1* 1Çankırı Karatekin University, Department of Chemical Engineering, Çankırı, 18100, Turkiye, 121
Kotova, Mechanical stability of materials.

Therefore, series of experiments are necessarily implemented to study various influence factors on the permeability of such ore heap, to provide theoretical basis for ameliorating heap permeability and improving copper recovery.
In addition, poor heap permeability and other factors such as imperfect facilities led to low leaching rate.
Ore Chemical Properties.
Alkaline oxide not only leads to high acid consumption, but also generates precipitation caused by chemical reaction to block the seepage path, which eventually affect leaching effect.
Conclusions Leaching process of copper oxide ore is mainly influenced by leaching flow velocity, whereas mud content and granularity are the key factors of controlling heap permeability.

Thermal Properties.
The properties of fibers and the bonding properties between fibers and resins are the key factors to determine the bending properties of composites[17].
Effect of chopped basalt fiber on mechanical properties of concrete[J].
Effect of chopped basalt fiber on mechanical properties of concrete[J].
Mechanical properties of basalt fiber with surface modification reinforced epoxy resin composite[J].

Facial Prediction and Recognition Using Wavelets Transform Algorithm and Technique Okuwobi Idowu Paul and Yonghua Lu College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 211106, China Corresp.
Facial recognition is influenced by several factors such as shape, reflectance, pose, occlusion and illumination which make it even more difficult.
The decomposition of the data into different frequency ranges allows us to isolate the frequency components introduced by intrinsic deformations due to expression or extrinsic factors into certain sub-bands.
Meanwhile, small variations in th1and th2 will not affect the performance of the method.
Eigenhill and eigenface methods were highly affected by illumination changes, while the proposed method is more robust to illumination changes as a property of Gabor wavelets..

The key factors affect the nucleation rate are not only effective titanium content in the steel, cooling rate and temperature, but also the size, distribution and quantity of the second phase particles existing in the steel.
The results are important for controlling the microstructure and properties of the steels.
Therefore mechanical property of the steel can be improved effectively.
The heterogeneous nucleation and epitaxial growth of the TiC formation could be important factors for controlling of mechanical properties of the steels.

The complexity of hydrate-bearing environments, coupled with the challenges of drilling and degassing, underscores the need for a holistic understanding of the factors affecting methane recovery.
The primary objective is to provide a systematic evaluation of how factors such as pressure, temperature, inhibitor concentration, geological conditions, and drilling parameters affect the dissociation process and overall extraction performance.
These properties govern the stability of gas hydrates and their response to external stimuli during extraction processes.
Geomechanical models incorporate sediment properties, using equations like Darcy’s law for gas flow.
Models rely on idealized assumptions, such as uniform sediment properties or simplified chemical interactions, which may not fully capture real-world complexities.

Through the experimental research on the use of recycled aggregate and recycled concrete powder, I propose recycled coarse aggregate, recycled powder of various physical and chemical characteristic and the powder mixed with cement slurry mixed with recycled coarse aggregate on the surface of the mechanical properties after treatment.
Recycled coarse aggregate particles have more angular, the surface is rough, more edges in the group that contains a certain amount of hardening cement mortar (cement mortar porosity is big, bibulous rate is high), In the process of broken disintegration, there are a large number of cracks within the concrete block as the cumulative damage., these factors make the holes of recycled aggregate content increased, thus increasing their rate of water absorption Through the bibulous rate test method for the measurement of recycled coarse aggregate bibulous rate and natural coarse aggregate gravel bibulous rate experimental results were 5.31%, 3.30%.
At present, the recycled coarse aggregate crush index can consult the standard of natural coarse aggregate , the crush index according to《the common concrete with sand, stone quality and testing method standard》(2006) JGJ52-the provisions of the methods to determine [3].The strength properties of recycled coarse aggregate depends on its mineral composition, proportion, water imbibition, pore structure.
In this paper the crush index of recycled coarse aggregate is 25.5%, the natural macadam crush index is10%. 3 The surface disposal of the recycled aggregates and compressive strength After crushing，the surface of the recycled coarse aggregate adhere to cement mortar or a small amount of hardening mortar alone into pieces, increasing the aggregate surface roughness, porosity, so this affects the new mix concrete compressive strength and so on the various work performance.
But if the water cement ratio is too big, it will affect the growth of the compressive strength of recycled aggregate, can not reach the purpose of strengthening.

Introduction Anchorages for CFRP tendon include: Bonded anchorage, Mechanical anchorage and complex anchorage.
The contact parameters: FKN (Act contact stiffness factor to) is 0.3; ICONT (initial near factor) is 0.1; FC (coefficient of friction): between the clip and anchor ring is 0.1, between the clip and the metal cylinder is 0.85; using the Augmented Lagrangian integral algorithm.
The coefficient of friction between the clip and the metal tube affects the stress value.
Summary 1) The numerical model meet the actual situation, which has better applicability. 2) Due to the large differences of material properties and treatments of surface, the F-D curve of the nonlinear spring unit should be improved. 3) When the angle of clips is 6°, the difference angle between clips and anchor ring is 0.1°, and the friction coefficient of the metal tube and clips is 0.9, the anchorage is the best.
Mechanical behavior experiment of wedge-bond anchorage for CFRP-tendons[J].

Simulation of Thermal Stress and Hot Tearing in Engine Block Casting Jinxiang Liu1,a, Ridong Liao1,b 1School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, PR China a liujx@bit.edu.cn, b liaord@bit.edu.cn Keywords: Thermal stress; Hot tearing; Engine block; Finite element analysis Abstract: Using finite element method, a numerical simulation is presented for engine block casting.
In addition, composition can affect hot tearing tendency.
Physically, two factors contribute to hot tearing in the mushy zone.
Tend is the temperature at which bridging of the dendrite arms between grains occurs. b is the solidification shrinkage factor. m is the viscosity of the liquid.
The amount of plastic strain will strongly depend upon the stress properties in the mushy zone.

The hydraulic structural parts sensors also named "Installation Disk" were produced through mechanical cutting LY12-CZ rods for many years.
Thus, the relevant factors must be comprehensive considered to select the reasonable mold structure, which include shape and size of the casting, application requirements and alloy materials of the mould, performance and processing costs of the die, as well as specific equipment on which the die fixed.
In general, durying the squeeze casting process, the parameters that affecting the quality of the workpiece main include specific pressure, pressure start time, holding time, mold temperature, metal pouring temperature, mold lubrication and so on.
Table I: The process parameters of the squeeze casting for flange roughcast Parameter Specific pressure (MPa) Pressure start time (s) Pressure speed (mm / s) Holding time (s) Mold temperature (oC) Pouring temperature (oC) Value 80 ~ 90 5 ~ 7 10 5 ~10 250 ~ 300 680 ~ 690 In the squeeze casting process, specific pressure applied during solidification can make melting metal timely eliminate pores, shrinkage, shrinkage porosity and other casting defects under the influence of isopressing, generates the crystallization solidification conditions under the pressure, and gain fine-grained microstructure and mechanical properties[2, 16].
There are many factors that affecting the size of specific pressure, in addition to workpiece material, the press style, shape and size of the workpiece should also be considered, the general way to determine the value of specific pressure is through experiment.