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Introduction Typical sandwich structures consist of a lightweight core material bonded to two thin face sheets of a stronger and stiffer material such as carbon/epoxy.
Stitched composite materials have been evaluated in recent years for structural applications, including stiffened wing structures for commercial aircraft.
(In Chinese) [3] Huang T, Jao G Q, Li Y, Journal of Mechanical Strength, Vol.29 (2007), p113.
Composites Science and Technology, Vol.63 (2003), p2401
Composites Science and Technology, Vol.65(2005), p2612

Effect of Die Coating on Tearing in Hot Extrusion of 7075 Aluminum Alloy Kuniaki Dohda1,a, Norio Takatsuji2,b, Tatsuya Funazuka2,c* and Ngernbamrung Sukunthakan3, d 1Department of Mechanical Engineering, Northwestern University, Evanston, 60201, USA 2Graduate School of Science and Engineering for Research, University of Toyama, Toyama, 930-8555, Japan 3Metal and Manufacturing Process Research Group, National Metal and Materials Technology Center, Pathumthani, 12120, Thailand adohda.kuni@northwestern.edu, btakatuji@sus.u-toyama.ac.jp, *cfunazuka@eng.u-toyama.ac.jp, dsukunthn@mtec.or.th Keywords: hot extrusion, 7075 aluminum alloy, die coating, tearing.
The material of die was made form SKD61 (HRC48).
At 600 mm, cracks were not observed on extruded material surface.
The surface of the extruded material was observed at 3000mm.
Dohda, Tearing mechanism of high-strength 7000 series aluminum alloy in hot extrusion, Journal of Japan Institute of Light Metals, 68 (12), 2018, p. 660-666

Compared with the ordinary semi-rigid material,it’s strength and stiffness are higher,it’s frost resistance, erosion resistance and fatigue resistance are better.
We need to study the subgrade material’s compressive strength, splitting tensile strength, flexural strength and other properties.And we also need to study the relationship among them.It can be of signification for the railway construction in cold region. 1.
Material and Test 1.1Materials 1.1.1cement：#425 cement,it’s brand is Lafarge and it’s produced in Dujiangyan city in Chengdu.
Relation of strength with age of lear concrete for roadbase[J].Journal of Chang’an University: Natural Science Edition,2004,24(3): 21-23
Road construction material[M].3rd ed.Beijing: People’s Communications Press, 1999.

We observe improved performance of the modified asphalt than the base asphalt, owing to the fact that the modified asphalt is a linear viscoelastic material, with special delayed elastic deformation and recovery properties.
Materials The materials used in the experiment are 2 kinds of base asphalt (i.e., jia de shi 70# and qi lu 70#) and 4 kinds of modified asphalt, i.e., MAC Modified asphalt, Crumb Rubber Modified asphalt, Rubber Modified asphalt and SBS Modified asphalt.
Additionally, under different stress levels, similar creep compliances are observed for modified asphalt, therefore the modified asphalt can be treated as linear viscoelastic materials.
Our conclusions are: (1) Modified asphalt is a linear viscoelastic material, with delayed elastic deformation and recovery properties during unloading period, and is vulnerable to stress level, temperature and loading frequency.
Journal of Chang’an University(Natural Science Edition).

This may be attributed to the insufficient hydrogen concentration trapped in the materials at lower c.d.
[2] Panagopoulos C and Papapanayiotou P, Journal of Materials Science, 30 (1995) 3449
[8] Matsui H, Kimura H, Moriya S, Materials Science and Engineering, 40 (1979) 207 [9] Moriya S, Matsui H, Kimura H, Materials Science and Engineering, 40 (1979) 217
[13] Matsui H, Kimura H, Moriya S, Materials Science and Engineering, 40 (1979) 207
[14] Kimura A, Kimura H, Materials Science and Engineering, 77 (1986) 75 [15] Zapplffe C, Sims C, Trans.

Abstract.“5.12 Wenchuan earthquake”triggered floods, landslide, collapse and secondary geological disaster, trigger a new soil and water loss, having the significant influence to the local river water quality.This article through the statistical analysis of minjiang river and jiangyou wenchuan, beichuan station 2006 ~ 2011 water conditions material, discussing the before and after the earthquake disaster areas of river water quality change characteristics.
Materials and Methods We chose minjiang river (Wenchuan water source), jiangyou station and beichuan station to investigate the water quality, and select ammonia nitrogen, total hardness, these two indicators to analyze the change trend of the water quality before and after the earthquake.Through the use of gray dynamic model group method, using different time data set up different gray GM (1, 1) model to construct the gray forecasting model group, as the earthquake disaster areas water quality prediction model.Water quality monitoring data are provided by Sichuan Soil and Water Conservation Ecological Environmental Monitoring Station.
A statistical prediction model of the organic pollutants concentration in Yellow River of Lanzhou [J].Environmental Science, 1989, 10 (3) :72-74 (.in Chinese) [4] Nagy H M, Watanabe M, Hirano M.
Journal of Hydraulic Engineering, 2002, 128 (6) : 588-595
Environmental Science & Technology, 2004, 27 (1): 51-54 (.in Chinese)

Simulation and Implementation for the Speed Control System of Horizontal Continuous Casting Dragger for Copper Yue-dong Chen1 and Zhen-hua Xia2, a 1,2Key Laboratory of Anhui Electric Drive and Control, Anhui Polytechnic University, Wuhu, Anhui a0xiazhenhua0@163.com Keywords: Copper material, continuous casting, Horizontal traction, variable-Frequency driving.
Traction with a horizontal continuous casting process not only requires frequent change steering, the ability of starting and braking of the motor is required highly, because copper material’s shape and size are quite different, there is a high demand on the higher speed range and a frequency range demand of 5 ~ 80HZ.
VVVF Control for the SFC copper ingots with horizontal draught, Journal of Anhui University of Technology and Science.2007,22(2):51-54

In this paper, fundamental experiment carried out by using modeling material and knowledge about bonding of some separated parts was obtained.
Introduction Industrial products with complex shape and/or different material at low cost have been increased in recent years.
For the same cause, material is considered to be flowed to the underside of rib.
Because too much material flows to the underside of ribs and pushes the rib, it is not extruded while the outer portion is extruded.
Chen, Fabrication of three-layer pipes composed of ZrO2 and stainless steel by multibillet extrusion method, Journal of JSTP, 41-469, 2000, pp.161-165

Chemical composition of CuOFE copper used for the synthesis of Cu-C materials.
Characteristics of stress relaxation grade for all analysed materials in function of time are shown in the figure 5.
CuOFE reference material has significantly higher maximum grade of stress relaxation, which equals 16% (more than 23% higher than for both Cu-C materials).
Fukui: The Science and technology of Carbon Nanotubes, ISBN: 0 08 042696 4, Elsevier Science Ltd, 1999
Nasibulin: New Hybrid Copper Composite Materials Based on Carbon Nanostructures, Journal of Materials Science and Engineering, B 2 (4), 2012 [7] T.

Ceramic materials have been used in many industrial fields for a long time, and in such luminescent materials field, some useful materials have been utilized.
Garnet and sesuquioxide materials are common transparent ceramic materials because they have a simple cubic structure.
In addition to oxide materials, halide materials are also developed and introduced.
The Cooperative Research Project of Research Institute of Electronics, Shizuoka University, KRF foundation, Hitachi Metals Materials Science foundation, and Inamori foundation are also acknowledged.
Li, Formability of ABO3 cubic perovskites, Journal of Physics and Chemistry of Solids, 69 (2008) 967-974