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With the gradual improving of permanent magnet material performance-price ratio and control system performance, permanent magnet linear synchronous motor will be more widely used in NC machine direct drive system.
In order to simplify the analysis, this paper makes some assumptions as follows: 1) Only thinking the fundamental magnetic field; 2) The yoke of the stator and mover is isotropic, and their permeability is infinite; 3) The ferromagnetic materials are unsaturated, the magnetic is linear, and the principle of superposition is satisfied; 4) The changes of the Z-axis magnetic field are ignored; 5) The conductivity of ferromagnetic materials is zero, the eddy current is ingored.
The different kinds of ferromagnetic materials are respectively located in the yoke of the primary and the secondary.
The curve of electromagnetic thrust and magnetic levitation force Acknowledgment This project is financially supported by National Natural Science Foundation of China (50975181).
Journal of Shenyang University of Technology, 2009, 31(6): 601-605

Therefore, the GH984G alloy possessed excellent stability of microstructure and mechanical properties between 700 and 750 ℃ up to 3000 h, and it is a promising material for 700 ℃ advance ultra-supercritical coal-fired power plants.
Experiments The specimen materials of GH984G were vacuum induction melted and then hot worked to bars of 16 mm in diameter.
Bakker, Materials for Ultrasupercritical Coal Power Plants-Boiler Materials, Part 1.
Tanzosh, Boiler Materials for Ultra-Supercritical Coal Power Plants—Steamside Oxidation, Journal of Materials Engineering and Performance. 15 (2006) 255-274
Du, A superheater tube superalloy GH2984 with excellent properties, Acta Metall Sin (in Chinese). 41 (2005) 1221-27 [10] Metallic materials - Tensile testing at elevated temperature (ISO 783: 1999, MOD), GB/T4338-2006. p. 5

This study was conducted through the characterisation of parameters directly related with the degree of alteration of the materials: water absorption at atmospheric pressure (EN 13755), open porosity (EN 1936), flexural strength (EN 12372) and bowing (EN 16306 par. 8.2).
Materials and Methods The five marble samples tested, and their petrographic characteristics, are shown in Table 1.
Construction and Building Materials 23.7 (2009): 2599-2605
International Journal of Rock Mechanics and Mining Sciences 36.1 (1999): 119-126
Environmental Earth Sciences 75.11 (2016): 946

Being electric it is popular to test CFRPs materials using eddy current sensors.
Meyendorf, High-resolution eddy current sensor system for quality assessment of carbon fiber materials, Microsystem Technologies-Micro-and Nanosystems-Information Storage and Processing Systems 16 (2010) 791-797
Composites Science and Technology. 61(6) (2001) 865–873
Hu, Novel electromagnetic modeling approach of carbon fiber-reinforced polymer laminate for calculation of eddy currents and eddy current testing signals, Journal of Composite Materials. 49 (2015) 617-631
R Valeau, Eddy current nondestructive testing of graphite composite materials, Mater.

Study on transient air permeability of concrete under different curing conditions MU Song1,2,a, WU Ye1,3,b, JIANG Qian1,3,c, Shi Liang1,3,d 1State key laboratory of high performance civil engineering materials, Jiangsu Research Institute of Building Science, Nanjing 210008, People’s Republic of China 2 Southeast Univeristy, Nanjing 210008, People’s Republic of China 3 Jiangsu SOBUTE New Materials Co., Ltd., Nanjing 211103, People’s Republic of China amusing@cnjsjk.cn, bwuye@cnjsjk.cn, cjiangqian@cnjsjk.cn, dshiliang@cnjsjk.cn Keywords: Air permeability; Curing condition; Ratio of water to binder; Mineral admixture Abstract: Quality of concrete cover is a key factor for concrete durability.
Experiment Raw Materials.
However, abnormal results of W/B65 and FA15 samples demonstrate that curing compound is not an effective method to guarantee good air permeability of cementitious materials of concrete with a high ratio of W/B.
Materials and StructuresVol.25(1992), p. 358 [3] Basheer, L., Kropp, J., & Cleland, D.
Journal of Advanced Concrete TechnologyVol. 11(2013), p. 322.

The cleanliness of materials for pharmaceutical components is of paramount importance.
If materials are not clean and sterile, bacteria can thrive on biomedical equipment, potentially leading to infections upon use.
Rethwisch, “Materials Science and Engineering: An Introduction”, 10th ed., Hoboken, NJ: John Wiley & Sons, 2018
Osipov, “Microstructure and Corrosion Resistance of Ferritic and Martensitic Stainless Steels: A Review,” Materials, 2019
Nawrat, “Electrochemical polishing of austenitic stainless steels,” Materials (Basel)., vol. 13, no. 11, pp. 1–25, 2020, doi: 10.3390/ma13112557

Furthermore, adhesive joints allow overcoming the problems related to the difficulties in joining large areas or dissimilar materials, also preventing contact corrosion.
Materials and Methods The material studied in this work is AA6082 alloy in the shape of 2.0 × 100.0 × 25.0 mm3 metal sheets.
Properties of uncured material.
It is important to point out that, for this kind of materials, a shore hardness test is advisable, hence presented results only have comparative purposes.
Qu, Journal of Adhesion Science Microstructure , adhesion strength and failure path at a polymer / roughened metal interface, J.

Research Programme Design As we all know, fiber raw materials have a very big impact on the application and production processes of textile products.
Generally, the higher crystallinity of polymer materials, the higher proportion of crystallization area, molecular arrangement more tidiness, and the ability of bear external force is larger, the better strength of fiber.
Table 3 shows that the degree, rigidity and elastic of fibers are highly related with molecular structure and morphology structure, and comply with the general rule of polymer materials.
[4] Dongya Gu: Liaoning chemical Industry (Natural science edition), 2009, 38(12): 914-915.
[5]Yi-xian Lin and Wen-qin Du: Wuyi university journal (Natural science edition), 2006(03): 76-77.

Professor Wen Shizhu, at Tsinghua university tribological state key laboratory, made a great contribution for subsequent research in fluid lubrication and friction of materials research [4].
Possessing both the wide and the accurate study, AR 2000 ex can undertake fluid, polymer melt conductor and reactive materials research and development.
Xie: Synthetic lubricating materials, Vol. 33 (2006) NO.3, p. 33-37
Bai: Synthetic lubricating materials, Vol. 31 (2004) NO.1, p. 35-41
Wen: Journal of Mechanical Engineering, Vol. 36 (2000), p. 2-6

Introduction It is well known that the size of crack tip plastic zone is a factor of fundamental importance in the fracture behavior of metallic materials.
However in metallic materials, the crack propagation need more energy than that consumed by new formed free surfaces [3], which implies that there is always a region around the crack tip where plastic deformation occurs, inferring that the stress singularity does not in fact exist.
Second, the effect of material yielding is omitted on the value of KI.
Orowan E, “Energy criteria of fracture,” Welding Journal. 1955;34:157-160
Yu MH, “Advances in strength theories for materials under complex stress state in the 20th century,” J.