Search results

P-Least Squares Method of Curve Fitting Lemin Gu College of Materials Science and Engineering Tongji University, Shanghai, China gulemin@tongji.edu.cn Keywords: Least Squares method, Chebyshev; Optimal Approximation; Curve fitting Abstract.
This method is introduced by some examples unified in the materials science, the chemical engineering and the life body change. 1 Introduction Least Squares (LS) method independently published by French mathematician Legendre (A.M.Legendre,1752—1833) in 1805, and by German mathematician Gauss (C.F.Gauss,1777—1855) in 1809, is the most widely used in mathematical statistics today.
In materials science, chemical engineering, bio-engineering, involving a large number of experiments and data processing, calculation of LS method because of its convenient and effective making it the most commonly used method.
Numerical Mathematics A Journal of Chinese Universities (soon publishes)
JOURNAL OF SHANDONG INSTITUTE OF LIGHT INDUSTRY.Vol.17 (2003), p.51-55

This result will play a theoretical guidance for the research of waveguide containing left-handed materials.
It was until the split ring resonator (SRR) medium introduced by Pendry et al. [3] that gave the opportunity to make a material with negative permeability, from which a left-handed medium can be constructed, as Smith et al. demonstrate [4].Since then, “left-handed”materials becomes the hot subject both in experimental and theoretical efforts, as it promises applications on optics, quantum optics, and electromagnetism. [5-8] Compared to traditional medium waveguide, sandwich structured materials made up of usual medium of coat- and substrate- layers and“left-handed”materials of central-layer show peculiar properties in plane guided wave, such as the absence of the fundamental TE modes, mode double degeneracy, and sign varying energy flux.
Acknowledgment This work was financially supported by the Natural Science Foundation of China under Project number 50061001and 50661001; supported by the Science Foundation of Guangxi Province under Project number 0991026, 0832029, and 0639004.
Observation of the inverse Doppler effect in negative-index materials at optical frequencies[J]. 2011, 5(4): 239-245
Journal of Physics: Condensed Matter. 1998, 10(22): 4785

Compared to other smart materials, GMM has faster response and larger magnetostrictive strain.
Journal of Jilin University (Engineering Science)(2007)
Journal of Materials Research(2005)
Journal of Zhejiang University(Engineering Science)(2008)
JOURNAL OF MECHANICAL ENGINEERING(2009)

Karppi 1996 The application of electron beam welding for the joining of dissimilar metals: An overview Journal of Materials Processing Technology 59(3) 257-267 [5] D.
Dontu, M Avram, A Spânu, C Rizescu, C Rizescu, T Pascu 2016 Study on laser welding of stainless steel/copper dissimilar materials IOP Conference Series: Materials Science and Engineering 147 (1) 012047 [6] D.
Munteanu 2016 The electron beam welding of dissimilar materials - Case study IOP Conference Series: Materials Science and Engineering 161(1) 012058 [8] E.
Taban 2008 Toughness and microstructural analysis of superduplex stainless steel joined by plasma arc welding Journal of Materials Science 43(12) 4309-4315 [9] T.P.
-L Lü 2016 Microstructure and properties of pure iron/copper composite cladding layers on carbon steel International Journal of Minerals, Metallurgy and Materials 23(8) 920-927 [11] B.

As known worldwide, concrete is the most used materials in construction industry, due to its high durability and service life compared to other materials.
Al-Khatib, An Experimental Study on Self Consolidating Concrete (SCC) under Hot Weather and Hauling Time, Key Engineering Materials Journal, http://dx.doi.org/10.4028/www.scientific.net/kem.677.3, (2016)
Contemporary Materials (pp. 239-249).
International Journal of Concrete Structures and Materials, (2015),219-239
Moder Applied Science, (2009) 47-54.

Abstract: Composite materials are now a day most frequently used materials in aerospace structures.
They also increase weight of the system tat may nullify the advantages we get from composite materials.
These composite materials are mostly carbon fibre reinforced composites [1,4,6-8,9,10] and fibreglass reinforced composites[2,11].
There are number of studies on mechanically fastened composite materials [4,6-10,14,15].
The basic materials used to prepare joints of composite material were carbon gibers,glass fiber, epoxy, polyvinyl alcohol, wax polish, nut and bolt.

In order to coal mine safety production and protection of the area’s fragile water environment, the curtain grouting technique using fly ash cement materials mainly is taken for preventing water.
Furthermore, the curtain grouting technique using fly ash cement materials mainly is taken for preventing water, which is not only helpful for coal mine safety production and protection of water resources, but also low cost.
[5] Xi'an branch, China coal science research institute.
Xi'an: Xi'an branch, China coal science research institute.
Journal o f Mining & Safety Engineering. 27 (1): 35-39. (2010)

Study of the Gas Sensor Array based on Micro-Machined Ceramic Hotplate Yanbing Xue 1,2,a, and Zhenan Tang1,b 1School of Electronic Science and Technology, Dalian University of Technology, Dalian, Liaoning 116023, China 2School of Electrical and information Engineering, Dalian Jiao Tong University, Dalian, Liaoning 116028, China adlxyb@djtu.edu.cn, btangza@dlut.edu.cn Keywords: Ceramic hotplate, Gas sensor array, Gas sensitive materials, laser processing Abstract.
Taking ceramic hotplate as heating platform and nano-SnO2 materials with Pd doping concentration of 0.2 at.% and 10 at.% as sensitive materials respectively, the array with two gas sensors was designed and fabricated.
Gas sensor array is composed by coating different sensitive materials on interdigitated electrodes located in the symmetry position on the bridge.
(a) (b) Fig.4 Photos of array gas sensors (a) Ceramic microstructure by laser processing (b) Mounting on TO-5 package Preparation of sensitive materials.
Two kinds of sensitive materials of sensor array are 0.2 at.% and 10 at.% Pd doped SnO2 powders, respectively.

Acknowledgements This work is financially supported by the National Nature Science Foundation of China (No. 51072099) References [1] Yuko Morohashi, Tadashi Maruyama, Takako Donomae, et al, Neutron Irradiation Effect on Isotopically Tailored 11B4C, Journal of Nuclear Science and Technology, 45, 867–872(2008)
Speyer, Hyukjae Lee, Advances in pressureless densification of boron Carbide, Journal of Materials Science 39, 6017– 6021(2004)
[7] H.R.Baharvandi and A.M.Hadian, Pressureless Sintering of TiB2-B4C Ceramic Matrix Composite, Journal of Materials Engineering and Performance, 17, 838–841(2008)
Dariel, A novel approach for the preparation of B4C-based cermets, International Journal of Refractory Metals & Hard Materials 18, 131–135(2000)
Effects of sintering aids on mechanical and dielectric properties of Si3N4 ceramics, Materials Research Innovations 4, 338–341 (2010)

If the inclusion in the raw materials is very low, inclusions in smelting amorphous master alloy would be lower.
To control impurities of oxygen, nitrogen, carbon and other elements of the various raw materials into the furnace are very important
Acknowledgements This work was financially supported by the National Natural Science Foundation of China (50974051).
Journal of Iron and Steel Research, 2011, 18(6): 17~22
Journal of Iron and Steel Research, 1991, (2): 7.