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LCA is a process of evaluating the environmental impacts associated with a product, process, or activity by: identifying and quantifying the energy and materials used and the wastes released to the environment; assessing the impacts of those energy and material uses and releases to the environment; and identifying and evaluating opportunities for environmental improvements [9].
All emissions, energy consumption, materials and cost are based on this functional unit.
Acknowledgment This research was supported financially by the Key Project (No.71033005) from National Natural Science Foundation of China.
Hu, et al., To evaluate the environmental impact of copper slag as raw material of copper concentration using life cycle assessment method, Chinese Journal of Environmental Engineering 3 (2009) 349-353
Graduate University of Chinese Academy of Sciences, Beijing, China, 2007

Active isocyanate group can react with the most materials that have active hydrogen groups [1].
[3] Rozman HD, Tay GS, Journal of Applied Polymer Science, 110 (2008) 3647–54
[5] Mat Amin KA, Haji Badri K, Journal of Applied Polymer Science, 105 (2007) 2488–96
[10] Wilberforce S, Hashemi S, Journal of Materials Science, 44 (2009) 1333-43
[16] Sapuan S, Pua F-l, El-Shekeil Y, AL-Oqla FM, Materials & Design, 50 (2013) 467-70

Experimental Part Materials.
PMMA is one of the known insulating polymer materials.
Ramakrishna, Biocompatibility evaluation of protein-incorporated electrospun polyurethane-based scaffolds with smooth muscle cells for vascular tissue engineering, Journal of Materials Science. 48 (15) (2013) 5113-5124
Wendorff, Functional materials by electrospinning of polymers, Progress in Polymer Science. 38(6) (2013) 963-991
Li, Electrospun poly (methyl methacrylate) nanofibers and microparticles, Journal of materials science. 45( 4) (2010) 1032

Material Properties and Loading Conditions.
a connecting material, since it is a commercial product, elastic behavior was assumed as shown in Table 4 and material properties were applied to the properties of commonly used steel materials.
Acknowledgments This research was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education (2021R1A6A1A03044326).
Kim, A Statistical Analysis of Results of Detailed Inspections on Aged Concrete Erosion Control Dams in Gyeongsangbuk-do, Journal of Korean Society of Forest Science. 111 (2022) 276–286
Im, Hydraulic Relation of Discharge and Velocity in Small, Steep Mountain Streams Using the Salt-dilution Method, Journal of korean society of forest science. 107 (2018) 158-165

Journal of Materials Science: Materials in Electronics 25, 864–872 (2014)
Journal of Materials Science: Materials in Electronics 26(6), 3629–3637 (2015)
Journal of Materials Science: Materials in Electronics 27(4), 3182–3192 (2016)
Journal of Materials Science 46(5), (2011)
Journal of Materials Science: Materials in Medicine 28, 1557–1562 (2017)

The recent development of two types of environmental friendly cementitious materials, magnesium oxychloride cement and magnesium phosphate cement, at HKUST are presented.
The bonding of these cementitious materials can be achieved at room temperature through chemical reaction, as opposed to fusion or sintering at high temperature.
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Pairs of different materials are most suitable for these purposes, for example, metal-ultrahigh molecular weight polyethylene [13-15].
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Shi, Niobium carbide (MXene) reduces UHMWPE particle-induced osteolysis, Bioactive Materials. (2021) [18] D.Yang, S.
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Takahashi, Vitamin E-stabilized highly crosslinked polyethylenes: The role and effectiveness in total hip arthroplasty, Journal of Orthopaedic Science. 22, 3 (2017) 384–390

Hardness value is also affected by the particles size of the materials.
E, Biomechanical Assessment Of Vertebrae With Lytic Metastases With Subject- Specific Finite Element Models, Journal Of The Mechanical Behavior Of Biomedical Materials. 98 (2019) 268–290
Materials Science And Engineering. 31 (6) (2010) 1240–1244
J, Microhardness Of Human Cancellous Bone Tissue In Progressive Hip Osteoarthritis, Journal Of The Mechanical Behavior Of Biomedical Materials. 64 (2016) 86–93
W, Preparation And Characterization Of Nano-Hydroxyapatite / Silicone Rubber Composite, Materials Letters. 62 (2008) 3307–3309

Introduction With the development of new materials and maching technologies, more and more structural ceramic parts are used to substitute for metal counterparts due to their excellent physical, chemical and mechanical properties [1] .
But for super-precision ELID grinding of hard and fragile materials, owing to thermal deformation of machine tool, it's not correct.
Zhu and Richard Monahan: Journal of Materials Processing Technology Vol.104 (2000), p. 178-184 [2] H.
Bandyopadhyay: Journal of Material Process Technology, Vol.57 (1996), p.272-277 [3] Z.H.
Yu: Natural Science Journal of Jilin University of Technology Vol. 31 (2001) No. 3, p. 95-97 [4] Q.P.

And the nano Fe3O4/LDPE composite materials with different mass percentage concentration of 0.25 to 1 percent were prepared by melt blending.
Introduction Compared to common polymers at the macro level, Inorganic nano composite polymer materials shows unexpected characteristics such as light, electricity，magnetism and thermal aspects and demonstrates broad application prospect.It has become a concerning research direction in material science [1, 2].At present, many scholars mainly make the cross-linked polyethylene and low-density polyethylene as the basic materials and make various preliminary dielectric property study based on several concentrations of different inorganic nano-composite materials.
[2] Wenjun Zou, Jin Peng, Yun Yang: Materials LettersVol.61(2007), p. 725-729
[6] Xia Cheng, Shaoqing Chen, Xia Wang: Insulating Materials Vol.41(2008):44-48,in Chinese
[10] Liqiu Chu, Yu Chen, Wenjuan Su: Polymer Materials Science and EngineeringVol.27(2011), p.39-42,in Chinese