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The study was conducted on eighteen subjects, required to drill wood material using electric drill for 5 and 15 minutes.
There were two experiments taken for each subject using equipments to drill wood materials for two different duration periods. 2.3 Experiment Apparatus 2.3.1 Drilling machine The portable drilling machine (Bosch GBM 450 RE, approx. weight 1.5 kg, ø4 mm, 450 W) was used in this study.
International Journal of Industrial Ergonomics 2008:38: 652–660
Proceeding of 2009 IEEE Toronto International Conference–Science and Technology for Humanity.Toronto,Canada, 2009
Scandinavian Journal of Work Environment and Health 1997:3:23–27

The creep deformation of engineering materials at elevated temperatures has received significant attention for many years [2-5].
Power function of time addressed by Findley[20,21] can be adopted to precisely predict the creep behavior of some materials and composites.
Acknowledgements The authors are grateful for the help of the Center for Nanotechology, Materials Science, and Microsystems at National Tsing-Hua University, Taiwan, R.O.C.
Creep of engineering materials.
American Society for Testings and Materials, Philadelphia, PA, 1944

It is important to create materials, which allow tuning the electron band structure on demand, a process called band-structure engineering.
Korbutyak, in XI International Conference on Nanostructured Materials NANO2012, 26-31 Aug. 2012, Rhodes, Greece, Rhodes, Greece, 26-31 Aug. 2012
Chen, Polycrystalline Graphene and Other Two-Dimensional Materials, Nat Nano 9 (2014) 755-767
[18] Quantum Espresso, Integrated Open-Source computer codes for electronic-structure calculations and materials modeling at the nanoscale.
Yip (Ed.), Handbook of materials modeling,  Springer, Dordrecht, 2005, pp. 196-214 [20] R.

Materials and Methods The Source of Bacteria.
Science of the Total Environment,Vol.355(2006),p. 78 [4] Jingyuan Xu, Zhenyang Ge, Yong He.
Anhui Agricultural Sciences, Vol.35(2007),p.10033.
Beijing: Science Press, 2001:399-413.
African Journal of Microbiology Research. 2010, 4(3):185-196.

New materials, information, biology, communication, energy, aerospace, electronics and many other fields’ new technique are profoundly changing people's lives, the application of new technique plays a more and more important role in economic growth.
Science Press , 2005, pp. 1-30, 92-107
Hunan Science and Technology Press, Changsha. 2000. pp.11-54，411-416.
[9] Kai Tang, Huiyun Zhang, Journal of Hebei University of Technology, 2002,Vol31(6),pp.18-24.
[11] Huiyun Zhang,Yuanhu Tang, Science & Technology Progress and Policy, 2002.11, pp.117-119.

The "optimal" approximating or fitting of the known data means that the analytical expression of Y = f (x, c) adapted to the background material is used to reflect the dependency between x and Y.
Acknowledgment This research is supported by Achievement Transfer Program of Institutions of Higher Education inChongqing（No. kjzh11221）and Chongqing Engineering Research Center for Metallurgy Inspection & Equipment (No. cstc2011pt-gc70007) , the National Natural Science Funds(NO.51275547) and Research Foundation of Chongqing University of Science & Technology (No.
CK2011B02),the Science & Technology Innovation Foundation of Ministry of Science & Technology for Small-Medium Enterprises(No. 12C26245116128 & No. 12C26215116103） References [1]Jia Bi,Zhang Hua,Shi Jinliang, Chang Jin,Zhang Jia xiang,Fu Wei song.
Journal of Wuhan University of Sci. & T ech. ( Natur al Science Edit ion),2007,30(3):231-233 [2]Dawson P R.Ironmaking and Steelmaking, 1993，20(2):137-143
Mineral Metallurgy Material [J], 2002,9(1):20-24

Similarly, in order to improve the structural reliability, the material using amount would increase.
Obviously, the reliability index and material using amount are a contradiction.
There is a single objective function which is about the material using amount generally in the model.
Acknowledgements This work was financially supported by the Guangdong Natural Science Foundation (06027195) and the State Key Laboratory of Subtropical Building Science, China (Grant No.
Journal of Hefei University of Technology (Natural Science), Vol.14(1) (1991), p.55.

Ding: Material Script of china Vol. 18 (2004), p. 72
Anand: International Journal of Plasticity Vol. 19 (2003), p. 1843
Bourke: Materials Science and Engineering A Vol. 399 (2005), p. 1 [5] S.R.
Nave: Metallurgical and Materials Transactions A.
Physical Metallurgy and Materials Science Vol. 36 (2005), p. 1697-1704

Zhang Xing [3] and Yu Shouwen [4] et al. introduce a variable of material damage degree, in the study on isotropic material, to reflect the elastic modulus changes at different time.
According to material mechanics, when members reach their design capacity, there is: =M/W=.
Material.
Journal of Vibration and Shock, 2009, 01: 68 -71 +196
Transportation Science & Technology, 2008, 06:10-12.

Introduction Magnetic ferrite nano-materials with good magnetic properties of ferrite and quantum size effects [1] of nano-materials, are widely used in a variety of applications including high-density information storage, magnetic fluid, targeted drug delivery and electromagnetic wave absorbing, etc. [2-5].
Its outstanding properties, as well as its potential economic advantage, has led magnetic ferrite nano-materials attract considerable interest in information recording and medication research, etc.
References [1] J P Liu, L L Liao: Inorganic nano-materials.
Ferrite material.
[14] Q R Lv，Q Q Fang, R Li, et al: Journal of Anhui University Natural Science Edition (In Chinese).