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According to the reference [11], the laser welding machine used is 4kW YAG laser, and the thickness of the welding material is TC4 titanium alloy of 1.5mm.
Acknowledgments This work was supported by the National Natural Science Foundation of China (61305031), Natural Science Fund of Jiangsu Province and ‘333’ fund (KB2012227，12KJB510023), ‘226’ High-level Personnel Training Project of Nantong city.
References [1] Zhang Shenghai, Shen Yifu, Qiu Huijuan: Optics & Laser Technology Vol.48(2013),p.381-388 [2] LI Yuan, WANG Qinglin, XU De: Transactions of the China Welding Institution Vol.8 (2008),p.16 [3] Fan Fanglei, Li Liangyu, Yue Jianfeng, Jiang Haizhen: Mechanical Science and Technology for Aerospace Engineering Vol.27 (2008),p. 1199-1206
[10] TIAN Ai-ling, ZHOU Jian-zhong,WANG Hong-jun,LIU Bing-cai: Journal of Xi’an Technological University Vol.27 (2007), p.10-14

Design about Automatic Vehicles Following System for Field Vibrator Motorcade Shuqing Li 1, a, Huan Zhang2,b and Zhifei Tao 3,c 1 Tianjin University of Science and Technology, China 2 Tianjin University of Science and Technology, China 3 BGP, China alshq@tust.edu.cn, bkittyzh@163.com, ctaozf@126.com Keywords: vehicles following technology; unmanned vehicle platoon; vehicles distance control; laser ranging.
Furthermore, the Mobileye Vision Technologies, a technology company in Israel, had successfully developed a relatively low-cost unmanned system, and the cost of material required for only a few hundred dollars beyond its simple function, such as only driving in the single lane road, acceleration, and parking at the traffic lights.
Research on Motion Control Approaches of Autonomous Vehicle in Urban Environments［D］．University of Science and Technology of China. 2012.
The International Journal of Robotics Research, Sep 2007; vol. 26: pp. 889-916, 2007

Huoshiling Formation Volcanic Reservoir Control Factors Analysis Of Wangfu Fault Depression In Southern Songliao Basin Xu Yan1,a, Haitao Xue2,b 1College of Earth Sciences, Northeast Petroleum University, Daqing, Heilongjiang, 163318, China 2Research Institute of Unconventional Petroleum and Renewable energy, China University of Petroleum (East China), Qingdao, Shandong, 266580, China ahame_xuyan@aliyun.com b1127888260@qq.com Keywords: volcanic reservoir, control factors, Huoshiling Formation, Wangfu sag, Songliao basin Abstract.
Elements logging analysis showed that the acidic dacite ingredients，the weak rhyolitic structure is visible on the FMI image, chloritization matrix is able to be seen under a microscope, alteration was serious and produced micro pores and microcracks, most of microcracks was filling with felsic and carbonaceous material.
Acknowledgements This work was financially supported by No. 41302103 project from Natural Science Foundation of China.
Reference [1] Yanxiong Wu, Pujun Wu, Weihua Bian etc.: OIL and GAS GEOLOGY, Vol. 33(2012), p. 236-247,264 In Chinese [2] Bo Zhou, Zhoubo Li, Baozhi Pan: Journal of Jilin University(Earth Science Edition) , Vol. 35(2005), p. 394-397 In Chinese [3] Lianguo Zhao, Yueqiao Zhang: PETROLEUM EXPLORATION AND DEVELOPMENT, Vol. 29 (2002), p. 44-46 In Chinese [4] Xiurong Zhang, Yajuan Yang, Jinghong Xiang: Progress in Exploration Geophysics, Vol. 29(2006), p. 211-215 In Chinese

Combined with laboratory conditions, the diffuser material, sewage emissions chosen model Scale model Scale value is: geometric scale: 30; flow scale: 4929.5; velocity ratio feet: 5.5; the scale of relative density: 1. 3.3 Analysis of test results 3.3.1 Analysis of the results of different azimuth The vents level azimuth directly related to sewage jet path and diluted diffusion effect on the project, there are three programs which include the azimuth of 0 °, 45 °, 90 ° as a physical model test program.
Research of environmental Sciences. 1994,7（5）：49—52
Hydraulic journal.1993,6
Marine environmental Science. 2000,19（4）：41—45
Advances in water sciences. 1995,6（3）：176—181

So from the calculation and analysis above, we may conclude: in the six central provinces, the urbanization levels of Hubei and Hunan belong to the high level, and the other four belong to the general level; judging from the ranking, Hubei’s urbanization level is the highest, Hunan ranking second, Henan ranking the third, Shanxi ranking the fourth, and Jiangxi and Anhui ranking at the bottom. 3.7 Comparative Analysis of Six Central Provinces’ Urbanization 3.7.1 Economic Level Restrict the Development of Urbanization Economic development level has a great impact on the region's urbanization level; it’s the fundamental driving force for urbanization and the material guarantee of improving the level of urbanization.
Acknowledgements This work was financially supported by Shanxi Philosophy Social Sciences Characteristic Discipline Construction Foundation (E08003).
Principle Research of Building Quantization Index System in New Rural Construction in China [J].Pioneering with Science and Technology Monthly, 2007(10):160-161
Extension Engineering Method[M].Beijing: Science Press,1997
[J].JOURNAL OF GUANGDONG UNIVERSITY OF TECHNOLOGY,2000,17(2):101-104

Automatic Ultrasonic Inspection Method of Railway Axle and its Remaining Life Prediction Hongwei Hu1, aXiongbing Li2,b , Xianghong Wang 1,c and Yimin Shao1, d 1 College of Automobile and Mechanical Engineering, Changsha University of Science and Technology ,Changsha,China 2 CAD/CAM Institute, Central South University, Changsha,China ahhwlucky@163.com, blixb_ex@163.com, cwangxianghong2000@gmail.com, d sym_888@163.com Keywords: railway axle; crack; automatic ultrasonic inspection ; defect analysis; life prediction; Abstract.
When the inspection* Supported by Research Fund of Hunan Provincial Education Department (10C0362) and National Natural Science Foundation in China (51005252) is done, we are more concerned about that how long the inspected railway axle can be continued to use.
Different algorithms for predicting life of cracked components are available in literatures[5,6].Among many models and algorithms to calculate the crack propagation rate, the most popular is Paris–Erdogan equation: , (1) where and are the parameters related to the material of axle, is the stress intensity factor(SIF).
Hoddinott: Railway axle failure investigations and fatigue crack growth monitoring of an axle, Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, vol. 218(2004), p. 283
[6] Cheng jin and Zhao Shushan:Fracture mechanics,Beijing:Science Press,2006 (in Chinese) [7] Vapnik, V.

Materials and Methods Preparation of Soil Specimens.
Xiao, Effect of relative density and biocementation on cyclic response of calcareous sand, Canadian Geotechnical Journal. 56 (12) (2019) 1849–1862. https://doi.org/10.1139/cgj-2018-0573 [2] J.
Pan, Biostabilization of desert sands using bacterially induced calcite precipitation, Geomicrobiology Journal. 33 (3-4) (2016) 243–249. https://doi.org/10.1080/01490451.2015.1053584 [5] F.
Jonkers, Biopolymers and biotech admixtures for eco-efficient construction materials, Woodhead Publishing. (2016). https://doi.org/10.1016/B978-0-08-100214-8.01001-0 [6] L.
Khosthtinat, Advancements in exploiting Sporosarcina pasteurii as sustainable construction material: a review, Sustainability. 15 (18) (2023) 13869. https://doi.org/10.3390/su151813869 [9] K.L.

Collins, Nonstoichiometry in line compounds, Journal of Materials Science 42, 1915-1919 (2007), http://dx.doi.org/10.1007/s10853-006-0055-2). ].
Collins, Diffusion and equilibration of site-preferences following transmutation of tracer atoms, in Diffusion and Thermal Transport in Bulk and Nano-materials, ed.
Lattice parameters a and distances of nearest approach in elements are in angstroms, with lattice parameters from [[] ASM Alloy Phase Diagram Database; https://www.asminternational.org/materials-resources/online-databases/-/journal_content/56/10192/15469013/DATABASE.
This work was supported in part by the National Science Foundation under grant DMR 18-09531 (MMN Program) and predecessor grants.

Journal Citation (to be inserted by the publisher) Copyright by Trans Tech Publications Positron and Positronium Annihilation in Low-Dielectric-Constant Films Studied by a Pulsed Positron Beam R.
Xu 5 1 National Institute of Advanced Industrial Science and Technology, Tsukuba-shi, Ibaraki 305-8568 and 8565, Japan, e-mail: r-suzuki@aist.go.jp 2 Semiconductor Process Lab.
Ltd., Fuji-shi, Shizuoka 416-8501, Japan 5 Oak Ridge National Laboratory,P.O.Box 2008,Oak Ridge,TN 37831,USA Keywords: low dielectric constant, low-k, diffusion of ortho-positronium, positron annihilation lifetime spectroscopy, PALS, AMOC, plasma-enhanced chemical vapor deposition, spin-on dielectric, porous material, three-gamma annihilation.
Since porous low-k materials are only available as thin films, slow positron beam techniques should be used.

The films deposited at different VS voltage (Fig. 2) are, including the unbiased substrate (Vf = +8.1 V), polycrystalline materials.
The effects of crystallite boundaries and preferential orientation in thin films are more important than in bulk materials.
Adamovich, The 2022 Plasma Roadmap; low temperature plasma science and technology, J.
Lichtenberg, Principles of Plasma Discharges and Materials Processing, 2nd Edition John Wiley & Sons, Inc. (2005) ISBN 0-471-72001-1 [18] A.
Brett, A corrosion study of nanocrystalline copper thin films, Corrosion Science 52 (2010) 3891-3895