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Some e-learning systems organize their learning materials in a category tree.
A user can find learning materials needed from the resource tree.
Users can find suitable learning materials by key words input.
Usually, there are two sources for the learning materials in an e-learning system.
Journal of Applied Sciences Research, 2007 3 (9) 828-836

There are several structures that can be used as a model, from natural to synthetically processed materials [5,6].
Callister, D.G Rethwisch: Materials Science and Engineering – An Introduction.
Studart et al: Journal of the American Ceramic Society Vol 89 (6) (2006), p. 1771
Zhu: Journal of the American Ceramic Society Vol 84 (7) (2001), p. 1654
FUKUSHIMA: International Materials Reviews Vol 57 (2) (2012), p. 115.

Feeding Mathematical Modeling of Superalloy Vacuum-Electromagnetic Casting and Its Application Wenzhong Jina*, Sufang Li, Wei Zhang aLuoyang Key Laboratory of Advanced Materials Forming Technology, Luoyang Institute of Science and Technology, Luoyang 471023, China *Corresponding author: Tel: +86-379-64963904; fax: +86-379-65928252.
The electromagnetic force responsible for producing the rotating motion can be expressed as [5]: (1) Where μr is the magnetic permeability for nonmagnetic conductive materials, μ0 is the magnetic permeability for free space, α is the eddy-current constant, P is the number of stirrer poles, H is the amplitude of the tangential magnetic field-strength at the stirrer side, r is the radius of the molten pool, R is the inner radius of the stirrer, Φ is the angle of phase displacement, ωs is the angular frequency of the eddy current, and t is the time of one cycle.
Journal of Materials Processing Technology. 77 (1998) 300-304
Materials Science and Engineering 2002; A327: 133-137
Materials Science and Engineering 2003; A355: 325-330

Adhesive pressing veneer performance study of compound sheet of straw Zhao Yan1, Pang Jiuyin2, Gao Zhenguo3 (1.3Beihua University, Jilin, 1320132 2Wood materials in Jilin Province Science and Engineering, Key Laboratory, Jilin) Key words: Veneer straw composite panels; Straw; Economic benefits Abstract: Using veneer and Straw shavings two kinds of raw materials to manufacture composite way veneer straw composite panels, Straw is discussed when the shop is the amount of glue, Adhesive proportion factor effect the performance of the veneer, and this kind of plank makes a simple analysis of economic benefit.The results show that: SEM test proves that the API surface diffusion performance is better than that of UF adhesive.
The research content Single raw material of man-made board production process, raw material moisture content and form, the slab of moisture content, density and thickness of plate, sizing amount, hot pressing pressure, temperature and time etc as the main factor.
When two or more composite board material, also need to add raw material proportioning, slab structure, analysing and sizing amount proportion factor as the main factor, etc.
Fujian Journal of Kasetsart University,1997,26(2):223~227

Computer Science.
Computer engineering & Science.
Advanced Materials Research.
Journal of AnHui University.
Chinese Journal of Computers.

Imron Rosidi tries to increase the production of cassava chips by optimizing the use of available materials.
Packaging materials are used to wrap chips before they are sold to consumers.
This data includes the amount of raw materials used, the amount of production, production time, and production costs.
The level of use of raw materials required in making this cassava stick in one package is presented in Table 1 and the level of inventory of raw materials held in one week for each material is presented in Table 2.
Journal of Simulation, 7(1), https://doi.org/10.1057/jos.2012.22.

Baptista: Materials Science and Engineering A Vol. 363 (2003), p. 297
Suryanarayana: Progress in Materials Science Vol. 46 (2001), p. 1
Oberacker: The Institute of Materials (Ed.), London Vol. (1993), p. 220
Filgueira: International Journal of Refractory Metals &Hard Materials Vol. 21 (2003), p. 251
Filgueira: Materials Science Forum Vol. 416 (2003), p. 293

Four sheet materials were tested; their principal characteristics are summarized in Table 1.
The two sheet materials with 2 mm thickness were the most thoroughly investigated.
The results for all the materials are overlapped in order to observe the general trends.
Lemoine (ArcelorMittal Maizière R&D Automotive Products) for providing the materials, to M.
Materials Proc.

Materials and methods Study site The study site is located at Zhenqin Village (33°29′37″N, 97°14′28″E), Chengduo County of Tibetan Autonomous Prefecture of Yushu, Qinghai Province.
The parent soil materials are mainly diluvial, moraine and outwash deposits.
Vol. 21(2001), p.101-107 [4]Shang Z H, Long R J, Ma Y S: Pratacultural Science.
Vol. 28(2008), p.1034-1044 [14]Wu W Z, Zhou Q, Yu B, et al.: Journal of Mountain Research.
Vol. 27(2009), p. 683-687 [15]Yin X Q, Song B, Dong W H, et al.: Journal of Geographical Sciences.

Zhou et al. have reported that the oxidized products of Li3Bi can do duty for potential composite materials [4].
The elastic constants of materials under pressures are indispensable to predict phase transition [8].
The calculated bulk, shear, and Young’s modulus as a function of pressure show that bulk modulus, shear modulus and Young’s modulus increase rapidly with the increasing pressure, implying that the external pressure can improve the hardness of the materials.
Part of the calculations was performed in Center for Computational Science of CASHIPS.
Ling: Journal of Yunnan University Vol. 34 (2012), p. 45