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Materials and equipment A total of 129 pieces of 32×120×3900mm Larix gmelinii form IKEA Wood in Mohe County, Hei Longjiang province, which contain the diameter class of 22cm and 26cm.
Larch timber is used as structural material which often bears side pressure, and there is some relation between side flexural and other strength.
Wood Science, 1979, 12(2):73-79
Size Effect of Length on Tensile Strength of Visually-Graded Chinese Fir Dimension Lumber [J] Journal of building materials 2010, 13(5):646-649.
ASTM D4761-05 Standard test methods for mechanical properties of lumber and wood-base structural material [S].

Materials and methods 1.1 Preparation of materials A new joint compound ( compatible agent+tackifier+SBS +crumb rubber +stabilizer) was studied.
Chemical materials for construction,2001(3):27-29(In Chinese) [6] Dongchang Zhang, Liqin Long.Technology of highway and transport. 2009(6):52-53 [7] Chongqi Shuo, Shang Lou.
Construction and building materials,2006,20,78-82 [9] Wei Wu, Guanghua Cui.
Foreign Sciences Section on Pharmacy, 2000, 27 ( 5):292 － 297 [10] Abu-izzaka, Garciacontrerasl.
Journal of Pharmaceutical Sciences, 1996, 85 ( 2 ):144-149

Material. sbacterium, BHI fluid nutrient medium, 1.5mlEP tube, PCR tube, micropette plus, electrophoresis apparatus, SC-B and gel imaging system.
Journal of Environmental Sciences,2011,31(8):1594-1601(in Chinese) [4] Yongmei Hu,Xiangqian Ge,Yunxiang Liang.
Journal of Anhui Agricultural Sciences,2009,37(6)：2402-2403，2421(in Chinese) [7] Wenjun Wang.Purification ability of Bacillus subtilison eutrophic water[J]．Hubei Agricultural Sciences, 2011,50(10):1972-1974(in Chinese) [8] Wei X,Yunxiang L,Jingyuan D.
Journal of Huazhong Agricultural University,2003,22(3):247-250 [9] Radler R H Chemical.
Water Science and Technology.1999.40:37-44 [10] Brk H Treatment of wastewater in the rhizosphere of the wetland plants-the root-zone method[J].

Virtual Campus Roaming System Optimization Algorithms Based on Virtual Reality Wei Yu Qing1, Xiao Juan1 and Hao Dong Qing2 1 College of Mathematics and Information Technology, Hebei Normal University of Science & Technology, Qinhuangdao 066004, China 2 Qinhuangdao Economic and Technological Development Zone News Center, Qinhuangdao 066004, China hbweiyuqing@yeah.net Keywords: Virtual Reality, 3D, Roaming System, System Optimization Abstract.
Internet-based VR roaming system design through the collection of information on user groups , such as the virtual scene pattern, colors, materials and other information needed to understand the interactive user needs, design time can be adjusted according to user needs to do in order to save development time.
Floor model is actually a rectangular parallelepiped having a thickness obvious, Shape node by the coordinate system of the original design of the shape of the floor, the material is selected, according to a number of specific parameters and appearance of the actual adjustment.
Acknowledgements The authors thank the following funds: Qinhuangdao Municipal Science and Technology Bureau of soft science projects: Computer Language College Examination Reforms and Practice (2008-1-102); Qinhuangdao Municipal Science and Technology Bureau of soft science projects: Virtual Campus Roaming System Research and Design (201101A022) References [1] Coors Volker: 3D-GIS in networking environments, Computers,Environment and Urban Systems, Vol.27 (2003), 345-357 [2] Fang Xiao-feng. 3D Simulation Designing System for Urban Planning Based on Virtual Reality[J].
Journal of Yangtze University, Vol.4 (2009),pp.217-219 [6] N.

FSW, being a solid state, low energy input, repeatable mechanical process capable of producing very high strength welds in a wide range of materials, offers a potentially lower cost, environmentally benign solution to these challenges faced by fabricators of this era [1].
This heat, along with the adiabatic heat within the material, causes the stirred materials to soften without melting.
Tables 1 shows the composition the two materials involved in the study.
Materials Science and Engineering A459 (2007), 7-18
[2] Shashi Prakash Dwivedi, “Effect of process parameters on tensile strength of friction stir welding A356/C355 aluminum alloys joint”, Journal of mechanical science and technology 28(1) (2014)285~291 [3] M.Jayaraman, R.Sivasubramanian, V.Balasubramanian, A.K.Lakshminarayanan, “Optimization of process parameters for friction stir welding of cast aluminium A319 by Taguchi method” JSIR 68(1) 36-43 [4] M.Ghosh, K.Kumar, S.V.Kailas, A.K.Ray, “Optimization of friction stri welding parameters for dissimilar aluminum alloys” Materials and design 31 (2010) 3033-3037 [5] Saad Ahmed Khodir, Toshiya Shibayanagi, “Friction stir welding of dissimilar AA2024 and AA7075 aluminum alloys” Materials and science engineering B 148 (2008) 82-87 [6] R.Nandan et al, “Recent Advances in Friction Stir Welding-Process, Weldment Structure and Properties”, Progress in Material Science 53, 2008, 980-1023

(eds) Design and Computation of Modern Engineering Materials.
Advanced Structured Materials, 54 (2014) pp 73–87
Journal of the Mechanical Behavior of Biomedical Materials. 127 (2022) pp.1-14.
Altenbach (eds) Design and Computation of Modern Engineering Materials.
Advanced Structured Materials, 54 (2014).

The technology's success relies heavily on operational parameters, including bed material properties and combustion conditions [7].
Silica sand, used as bed material, contributes to high combustion efficiency through its excellent heat transfer properties and thermal stability [8].
Materials and experimental setup.
Prior to each experimental run, silica sand (mean particle size: 250 μm, bulk density: 2.6 g/cm³) was introduced into the reactor as bed material.
of Environmental Management, Vol. 247, pp. 123-135 (2019) [8] Prakasa, E., Wijaya, K., Sutanto, H., Evaluation of Bed Materials in Waste-to-Energy Applications: Focus on Thermal Properties and System Stability, Renewable Energy, Vol. 185, pp. 257-268 (2022) [9] Liu, H., Wang, X., Zhang, L., Performance Analysis of Municipal Solid Waste Co-firing in Fluidized Bed Combustion Systems: Effects of Operational Parameters, Applied Energy, Vol. 331, pp. 120375 (2023) [10] Chen, X., Li, H., Wang, Y., Zhang, M., Analysis of Bed Material Behavior and Agglomeration Mechanisms in Biomass-Coal Co-firing Fluidized Bed Systems, Waste Management, Vol. 135, pp. 78-89 (2022) [11] Park, S.J., Kim, J.H., Lee, Y.K., Heat Transfer Mechanisms and Moisture Tolerance in RDF-Coal Co-firing Fluidized Bed Systems, Journal of Cleaner Production, Vol. 382, pp. 135647 (2023) [12] Mulhidin, S., Rahman, A., Pratama, H., Investigation of RDF Mixing Ratios on Furnace Temperature Stability in Coal Power Plants, Energy

Research and Realization of automobile transmission quality information technology of Internet of things based on Traceability Jin Ling Key words: The gearbox, the technology of the Internet of things, IDEF, information tracing method Abstract: This research mainly according to automotive modular production characteristic, proposed for tracing method module production in batches; parts relation and order information system construction of internal and external traceability system model; using the mass matrix and the batch list theory, research on the above two kinds of design theory of quality traceability scheme based on distributed management system, and establish the integrated application model and parts material network technology suppliers; tracing back combined back and realize the goal of batches of the product quality control in advance and the defects of the products.
Journal of Huazhong University of Science and Technology(Medical Sciences). 2013(02)

Introduction With the versatile applications of manufactured nanoparticles (NPs) which have been defined as a dimension in the range 1-100 nm in various fields, nanotechnology has proved to be a new horizon of material science.
Materials and methods Chemicals.
References [1] Nel, A.; Xia, T.; Madler, L.; Li, N., Toxic Potential of Materials at the Nanolevel.
Science 2006, 311, 622-627
The Journal of Physical Chemistry C 2009, 113, 10962-10966

Among these methods, electron beam welding has drawn more attention due to its high energy density, a deep and narrow joint, a minimal heat-affected zone (HAZ) and small distortion of welded materials [3,4].
Electron beam welding, laser beam welding and gas tungsten arc welding of titanium sheet, Material Science and Engineering.
Tensile and fatigue properties of electron beam welded dissmilar joints between Ti-6Al-4V and BT9 titanium alloys, Materials Science &Engineering A 584 (2013) 47-56
Advanced Materials Research. 996 (2014) 736-742
Effects of Stress-relief Annealing on the Residual Stress and the Microstructure of TA15 Welded Joint, Materials Science Form. 849 (2016) 281-286.