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Lord et al. investigated the influence to NiFe2O4 electric properties of oxygen pressure during sintering.
El-Sayed.

Table 1 The percentage composition of impurity elements in pure ammonium paratungstate (×10-6) Fe Si As Sb Ca V Ti Al Mn Mg Ni Cr Na P Co Pb Bi Sn Cu Mo S K Cd 8 8 8 8 8 8 8 5 5 5 5 5 5 5 5 0.8 0.8 0.8 3 20 3.6 5 1 Fig.1 The temperature curve of tungstic oxide reduced in the hydrogen gas Results and Discussion Fig. 2 and Table 2 display the SEM image and the granularity distribution of the as prepared tungsten powders with tungstic oxide through the first deoxidation in the hydrogen gas, respectively.
El-Shall: Nanostruct.

Table 1 Chemical compositions and mechanical properties of base materials Chemical composition (wt%) Mechanical properties Ca Al Mn Zn Si Cu Ni Fe Mg YS (MPa) UTS (MPa) El. (%) AZ31 0.04 2.5 -3.5 - - 0.1 0.05 0.005 0.005 Bal. 135 235 21.0 AZ31 +0.5CaO 0.51 2.84 0.41 0.86 0.031 0.001 - 0 Bal. 156.0 236.4 16.7 AZ31 +1.0CaO 0.96 2.87 0.41 0.75 0.57 0 - 0.001 Bal. 163.5 263.8 14.3 AZ31 +1.5CaO 1.46 3.12 0.36 0.75 0.017 0.001 - 0 Bal. 164.1 269.2 13.4 Results and discussion A welding process parameter window was developed to achieve fully penetrated welds in butt-joint specimens, as shown in Fig. 1.

References [1] Mechanical Optimization Design, Chen Lizhou, et al., Shanghai Science & Technology Press, Shanghai, 1982 [2] Theory of Machines and Mechanism (the fifedition), Sun Heng and Fu Zeshao, Higher Education Press, Beijing, 2009 [3] Foundation of Mechanical Design (the fifth edition), Yang Kezhen, el at., Higher Education Press, Beijing, 2006 [4] Methodology in Fuzzy Mathematics, Wang Caihua and Song Liantian, China Architecture & Building Press, Beijing, 1988

The elemental analyses were performed on an Elementar (Germany) Vario EL III elemental analyzer.
Zhang , Y.R Peng, et al.

Silica nanoparticles preparation using alkali etching process Marwa Nabil1,a* and Hussien.A.Motaweh2,b 1Advanced Technology and New Materials Research Institute, City for Scientific Research and Technology Applications, New Borg El-Arab City, Alexandria, Egypt. 2Department of Physics, Faculty of Science, Damanhour University, Egypt.
In this respect, it is interesting to note that the red photoluminescence observed by Glinka et al from mesoporous silica and silica nanoparticles and showing certain similarities with the PL of surface oxidized silicon nanocrystals is attributed to NBOs.

For boron adsorption, main adsorbents that have been studied are: (1) activated carbon [4]; (2) Mg/Al double-layered hydroxide compounds [5]; (3) clay materials [6]; (4) metal hydroxides and oxides [7]; (5) ion-exchange resins [8,9].
Lesch and E.L.

Tidrow, et al, Infrared Physics & Technology[J] 47 (2005) P.67-75
[5] Sun, X.M.; Zhang, H., Zhu, H., Xu, P., Li, G.R., Liu, J,Zheng,H.Z.Highresponsivity resonant cavity enhanced InGaAs/GaAs quantum-dot photosensor for wavelength of 1 mm at room temperature Electronics Letters Volume: 45 , Issue: 6 Digital Object Identifier: 10.1049/el.2009.0033 Publication Year: 2009 , P.329 – 331

Chen Hui et al. reported that pulsed current supply also shows better machining stability [9].
[8] Hewidy, M.S., Ebeid, S.J., El Taweel, T.A., Youssef, A.H., Modelling the performance of ECM assisted by low frequency vibrations, Journal of Materials Processing Technology. 189(2007)466–472

[3] El-fiky, Mohamed1, Ono, Satoshi, Nakayama, Shigeru.
[7] Qiao, Lihong, Zhu, Yixin1,Yang, Jianjun et al.A Petri net and genetic algorithm based method for flexible manufacturing cells modeling and scheduling.