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Thus, how to accurately simulate the true characteristics is a key technology addressed urgently for establishing high-fidelity FE model.
It can be seen that for a certain component, the section size and the FE element type are determined, the tension and compressive stiffness are only associated with the axial elastic modulus of the thin layer elements material.
For a specific structure component, when the structure size and the FE element type are determined, the shear stiffness is only related to the tangential shear modulus of the thin layer elements material.
But this kind of modeling method has some disadvantages: 1) Equivalent simulation for bolted joints needs to determine the material attribute values of the thin layer elements based on the test data, which cannot use without test data; 2) For the regular bolted joints, the interface can be easy to add a thin layer element, but for the irregular bolted joints, the interface is difficult to add a thin layer element to simulate.
Finally the paper discussed the modeling method that based on the parameterized modeling technology can apply to different bolted joints structure in engineering system, and which has provided effective technical support for the establishment of the FE model and dynamic characteristics analysis of mechanical system.

The presence of pores creates strong Van der Waals forces between the carbon and sulfur materials [14].
Yushin, Li-ion battery materials: Present and future, Materials Today 18 (5) (2014) 252–264
Liu, Biomass-derived porous carbon materials for advanced lithium sulfur batteries.
Key Engineering Materials 860 (2020), 173–177
Ji, Carbon materials for high-performance lithium-ion capacitor, Curr.

Introduction The current development of Ukraine’s mining industry is characterized by increasing depths of open-pit operations, extended in-pit haul road networks, and rising energy intensity in the transportation of mined material.
Based on the presented diagram (Fig. 2), which compares three types of haulage systems—traditional diesel, combined diesel–trolley, and fully electric—a comprehensive analysis can be carried out to assess the efficiency of each system according to three key performance indicators: fuel consumption, CO₂ emissions, and productivity.
Dependence of efficiency on the type of transport system The diesel haulage system remains the traditional solution in most open-pit mines; however, it delivers the weakest performance across all three key parameters.
[20] Information on https://engineering.ubc.ca/spotlight/student-project/optimizing-trolley-assist-co-pper-mountain-mine.

A Microfluidic Platform for Multi-antigen immunofluorescence assays Baoyue Zhang, Huixue Song, Tan Chen, Zhanhui Wang (*) Key lab for Biomedical Information and Health Engineering, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, P.R.
Materials and Mehtods A.Microfluidic Divice Fabrication The microfluidic device used for cell culture consists of 8 × 8 culture chamber array.

Design of Planetary Gear Reducer with Double Circular-Arc Helical Gear Chin-Yu Wang1, a 1Department of Mechanical Engineering, Cheng Shiu University, Taiwan, R.O.C.
If compared to the involute helical-spur gear drive of the same size and material, the bearing capacity of the tooth surface would be 2~3 times higher.
Another key point in the researches of circular-arc helical gears is about errors.
If similar bearing torque and the same material is used and the rotation condition is not changed, the volume of power winch can be reduced, cost can be lowered and flexibility of the miniaturization design can be improved because gears with smaller modulus can be used in the design of double circular-arc helical gear.
[3] Chen, Zhao Guang, Tang, Yu Yong, Wu, Hong Yie, Differential Geometry and Its Applications in Mechanical Engineering, Harbin Institute of Technology Press, Harbin, 1998

Gao 1,c 1 Department of Mechanical Engineering University of Connecticut Storrs, CT 06269-3139, USA a jzhang@engr.uconn.edu, bruqiang@engr.uconn.edu, crgao@engr.uconn.edu Keywords: Empirical mode decomposition, Hilbert-Huang transform, Ensemble empirical mode decomposition, Mode mixing, Vibration signals Abstract.
Through analyzing these two key parameters in the EEMD process, a criterion based on SNR is proposed to evaluate the selection of the amplitude of the added white noise, and correlation coefficient is used to determine the number of the trials.
Wang, Smart Materials and Structure, Vol. 12 (2003), p. 447 [6] R.
Hadjileontiadis, Engineering in Medicine and Biology Magazine, IEEE, Vol. 26 (2007), p. 30 [10] B.

Study on Features of 532nm Laser as Laser Source of Lidar Zhang Peng1, a, Xi Mingming1, a, Wang Manman1, a, Liu Pu1, a, Liu Tao1, a, Peng Hui1, a, Ren Guidong1, a, Tian Chun-Lin1, b* 1College of Mechanical and Electric Engineering, Changchun University of Science and Technology, Satellite Road No.7089, Changchun Jilin China, 130022 a2014200051@mails.cust.edu.cn, b*48851795@qq.com (Corresponding Author) Keywords: 532nm laser, Nd3+:YAG laser, High power, Laser tracking system Abstract.
Laser source is the key technology component of Lidar, the characteristics of Laser source directly determines the detection performance of Lidar.
The pulsed Nd3+:YAG laser is a typical Lidar source, because of the high output power, good beam quality, high stability and engineering technology mature making it has wide application in the Lidar [5-7].
In order to reduce the influence of the thermal lens effect, the laser work material adopts Nd3+:YAG crystal rods which have good heat conduction performance, the geometrical dimensions of crystal rods is Φ6×90mm, the doping concentrations of Nd3+ ion is 1.0atm%, the refractive index is 1.8197@1064nm, at both ends of the crystal rod are coated transmittance films that the transmittance 99.75%@1064nm, the laser damage threshold of crystal rods≥500MW/cm2Outside the cavity, using the nonlinear optical effect of KTP crystal and adopting II class phase matching, the 1064 nm light double frequency and output the wavelength of the second harmonic is 532nm.As a result of the KTP crystal frequency doubling efficiency can’t reach 100%, so adopt the narrowband filter will 1064 nm laser filter out, the angle between narrowband filter is placed and optical axis is 45 ° to ensure that the 1064 nm laser is completely filter out.
It’s including the pump efficiency of xenon lamp, the optical coupling efficiency of condensing cavity, the Work material Nd3+:YAG crystal rods on the absorption of the pump efficiency, each optical device insertion loss in the cavity, such as optical device for resonant cavity light energy of reflection, absorption and scattering loss, etc.

Numerical Study of Thickness Distribution of Stretch-Blow Bottles for Defects Prediction Pan Yayue1, a, Zheng Shuiying2,b and Pan Xiaohong1,c 1 Institute of Advanced Manufacture Engineering, Zhejiang University, Hangzhou 310027, China 2 Institute of Chemical Machinery, Zhejiang University, Hangzhou 310027, China a panyayue@126.com, bzhengshuiying@zju.edu.cn, cpan_xh@zju.edu.cn Keywords: Stretch blow molding process, Simulation, Thickness distribution, Prediction of defects Abstract.
Unfortunately, the numerical studies and experiments were all limited to study the molding process or the material constitutive model, and had no link with the defects in the bottles.
The wall thickness distribution is a key factor in determining the properties of bottles.
The bottles and molds Mathematical Model Stretch blow molding of PET bottles is a complicated process involving complex geometries, nonlinear time and temperature dependent material, large strain, and complex contact conditions.
Tanner: Engineering Rheology (Oxford University Press, New York 1985)

The suggestions to solve the problems The healthy living environment Healthy living environment designing means to design healthy,comfortable and safety space quality of living environment.Both the comfortable and safety outdoor wind environment,the space environment with smooth ventilation are the keys of living environment designing.In order to avoid the influence of high-rise residential wind environment, we can take the measures to improve as follows:Firstly,on the arrangement and distribution of building group,we can use the ladder form with high middle and low around.In the middle is the highest building,the surrounding buildings’ heights are decreasing,so that can build good streamline building outlines designing with rich layering.
In the aspect of residential itself,we can ues the low carbon building materials to reduce the waste of energy and pollution;In the aspect of living environment,we should pay attention to the balance of ecological and economic benefits’ combination,rational utilize the local natural resources,reduce the use of hard site to expand the natural afforestation.Processing the transitharmonious relationship between residential,afforest and human,ensure the fusion of construction and natural environment,and the harmonious communication between human and nature.
Engineering Structures, Vol. 18, No. 11, pp.861-875,1996
[7] Amir, Samuel,Robot, Scanlon.The wind effects on structures——Wind engineering [M].Liu Shangpei,Xiang Haifan,Xie Jiming,translate,Shanghai; Tongji University press,1992.348～3771

The effect of support platform motion on the strength of the blades and shafting is a key issue to be investigated for designing the wind turbine and support platform [9].
Ocean Engineering (2001)
Offshore Mechanics and Arctic Engineering (1999)
Workshop on Advanced Smart Materials and Smart Structures Technology, Dalian, China (2011)