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A Strategy for On-line Monitoring the Crosslinking Degree of 3D Printing Hydrogel Fiber Based on Dual-threshold Enhancement Method Yu Li1, Pingyan Bian2 1 School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo, Henan, China 454000, liyu@hpu.edu.cn 2 School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo, Henan, China 454000, bianpy@hpu.edu.cn Keywords: image enhancement, dual-threshold, crosslinking degree, 3D printing Abstract.
The crosslinking degree is one of the factors that determine the mechanical properties of the hydrogel fiber and scaffolds.
It raised two demands of the enhancement of crosslinking image: first the processing and analyzing of image should be modified for operator’ real-time observation; second the residual noise cannot be too big to affect the precision of crosslinking degree.
According to the above problems, the dual-threshold enhancement method was applied to process the crosslinking image of hydrogel fiber fabricated by the 3D printing process, in order to realize an accurate real-time measurement of crosslinking degree and ensure the mechanical properties of hydrogel fiber and scaffolds.
But after the image enhancement processing, the error derived from the pre-enhancing image can reduce, the weak bright portion of the image will be strengthened, the color gradation of the crosslinking image will be improved, the physical properties of the image will be restored, and the measurement of crosslinking degree will be more accurate.

The range of forces and accelerations are dependent on factors such as drop height, weight, shape, impact orientation and the surface onto which it is dropped.
Because the mesh size of the BGA tin balls would affect accuracy in stress and computer time.
The Component List of Material Properties.
In the LS-DYNA program, the basic material properties required for the linear elastic dynamic impact model are generally defined by the following parameters: density, Young's modulus, and Poisson ratio.
The mechanical properties for corresponding elements are listed in Table 1. 2.2 Loading Conditions The initial loading condition in this study assumes to be a half-sine wave with a peak value of 150 Grms and a duration of 6 ms.

Furthermore, EHD also has the benefit of being mechanical failure-free owing to its non-mechanical construction.
This mechanical energy causes the ionization of gas molecules, which causes these molecules to accelerate due to the kinetic energy imparted by collision.
Ambient temperature and relative humidity are nuisance factors that affect the drying in a non-uniform way, which might result in erratic data distribution in some cases.
Furthermore, ‘’ is a factor that influences the drying ratio ()[47].
Qu, “Physical and sensory properties of electrohydrodynamic (EHD) dried scallop muscle,” Journal of Aquatic Food Product Technology, vol. 21, no. 3, pp. 238–247, 2012, doi: 10.1080/10498850.2011.590271

Indeed, SSA in austenitic stainless steel affects mainly in α'-martensite.
However, it has been recently recognized that an additional static aging treatment at low temperatures on cold rolled metastable austenitic stainless steels containing α'-martensite is responsible for significant changes in mechanical properties, like yield strength and total elongation [4].
In this paper, the SSA in three different stainless steel grades, i.e. 301LN, 304L and 316L, is investigated and the value of their mechanical properties is optimized by a combination of the cold rolling degree, the martensite volume fraction and the time-temperature variables of the aging treatment.
Moreover, the base materials with a so-called 2B finish, which are fully austenitic, do not reveal any SSA effect on the mechanical properties within the range of time and temperature investigated in this study.
The way by which martensite is formed plays an important role on the mechanical properties.

For investigating the effect of temperature on the dynamic properties of concrete material, tests for cylindrical concrete specimens at 23℃ ~ 800℃ were carried out by using Split Hopkinson Pressure Bar (SHPB) apparatus, and the strain rates ranged from 30/s to 220/s.
In fact, the temperature has a significant effect on the mechanical properties of concrete material [15-23].
It is evident that micro-cracks will initiate and increase gradually with increasing temperatures induced by the incompatible physical properties between the cement and the aggregates inside concrete, even by the change in chemical and physical properties of concrete.
Many researchers investigated the effect of temperature on the strength of concrete under quasi-static loading condition and concluded that the strength of concrete deceases with increasing temperatures, and it can be explained by: a) dehydration of hydrated cement paste when temperature is higher than105°C; b) incompatible in physical properties between the cement and the aggregates inside concrete; c) the change in chemical and physical properties of concrete (above 5000C); d) crystalline transformation of quartz from α to β at about 573°C.
Conclusions The compressive behavior of concrete material is significantly affected by temperature and strain rate.

And these defects could have very strong adsorption properties of water and oxygen, which are not beneficial to the stability of OSC.
This may significantly change the mechanical and photo-electric properties of films.
Lu, Metal/metal-oxide interfaces: how metal contacts affect the work function and band structure of MoO3, Adv.
Correlation of Localized Structural, Electronic, and Chemical Properties Using Conductive Probe Atomic Force Microscopy and Raman Microprobe Spectroscopy, Langmuir 21 (2005) 3521-3528
Marks, Polymer solar cells with enhanced fill factors, Nat.

The HCF properties are shown in Table 2.
Due to HCF test results was influenced by many factors, so the number of cycles were different when stress ratio, surface state and value of stress intensity were same.
In addition, it will also be affected by multi-directional stress, which is also the reason for the embrittlement.
Hence, we know that TC11 alloy WSP sample is also affected by the multi-directional stress during the cyclic loading.
[15] Wang Jihui，Zheng Junping，Liu Jiachen，Huang Dinghai, Mechanical Behavior of Materials, Tian Jing：Tian Jing University Press. 83(2006)

Due to the ductility properties of coconut fibers will be useful especially for building materials on building infrastructure in the earthquake zone.
Aside from the fiber content, a fiber length factor determining the properties of splitting tensile strength of coconut fiber-reinforced concrete composite.
Kawai, Characterization of the morphological, physical, and mechanical properties of seven non-wood plant fiber bundles, Journal Wood Sci, 53 (2007) 108- 113
Chouw, Mechanical and dynamic properties of coconut fiber reinforced concrete, Construction and Building Mat, 30 (2012) 814–825
Hsieh, Effects of short coconut fiber on the mechanical properties, plastic cracking behavior, and impact resistance of cementitious composites, Construction and Building Materials, 127 (2016) 984–992

However, HPDC products possess low mechanical properties resulting from a substantial number of porosity during die-filling and the solidification in the die cavity.
Heat treatments, involving solid solution and aging treatments, are commonly regarded as the effective methods for improving the mechanical properties of Mg alloys.
Numerous studies focused on the effect of the solid solution treatment or ageing on the microstructure and mechanical properties of the die-cast AZ91[4-6].
The microstructure and mechanical properties of the AZ91 alloy are greatly dependent of the competitive behavior between precipitation of β- Mg17Al12 phase and recrystallization of α-Mg matrix.
All of the above changes in the factors facilitate the formation of recrystallization nuclei of α-Mg matrix.

Introduction Permanent magnet coupling, also known as magnetic coupling,it is the device transmitting the torque form the motor to the load that is through the air gap between the permanent magnet, and it is transmission without mechanical connection between the motor and load.
The factors that directly affect the torque transmission has the gap size between copper plate and the aluminum plate, material parameters and characteristics of the permanent magnet, parameters and characteristics of copper plate,the rise or descent temperature , machining precision and accuracy of installation.
Permanent coupling basic structure is relatively simple, but the difference of various magnetic properties and magnetic media together with effect of transient for the eddy current as the relative motion of permanent magnet and the copper plate, that caused extremely complicated for the magnetic field distribution.
Transient contains two meanings, one is transient electromagnetic process, one is transient mechanical processes in three-dimensional magnetic field.
For the magnetic coupling structure , the performance analysis and optimization, and to determine the impact factor based on the simulation.