Search results

El-Aziz: J.
Li, et al.: Chinese Patent, 200810117838.3 (2008)

These modifications are accomplished in two ways, either by synthetically modifying the monomers prior to polymerization or by the post-polymerization substitution of the polymer at the reactive benzimidazole N-H sites. [3] However, few papers were published on modifying the monomers prior to polymerization at the reactive benzimidazole N-H sites. [4] Hay et al firstly reported that the N-H group in benzimidazoles could undergo a C-N coupling reaction with activated halides to give linear polymers with high molecular weight under appropriate temperature, and the N-substituted homopolymers and copolymers have very high glass transition temperature and thermal stability. [5, 6] In addition, pursuing to explore higher molecular weight PBIs with different structures, carbonyl groups in the PBI polymers would be increased solubility and flexibility. [7] Base on these, in this paper, the synthesis of 1,4-bis(2-benzimidazolyl) benzene (BBIB) is reported along with the preparation of poly(N-arylenebenzimidazole
Elemental analyses were performed using a Vario EL III analyzer.

The former require a strong stand to aial radial load, The latter require a strong stand to tortional loading and shear to enhance bending rigidity. which are filled by orthotropic functionally material,Installing top layer in one direction have four independent elastic constants, the stress-strain relationship of the main arbor is expressed by equation(6) ：                            −−−− −−−− ====           LT T L LT T T TL T LT L G EE EE σ σ σ µ µ ε ε ε 1 00 0 1 0 1 3 2 1 (6) Where {EL} and {ET} and are respectively spanwise and radial elasticity; {GLT} is the shear moduli {GLT} , {µLT} or {µTL} is the poisson ration.
Each of the vibration modes is corresponding Material definition (fiberglass/araldite) Whole layer definition Section definition M o d e a n al ys i s Blade model Fig. 1 blade numerical design process of composite material to a frequency .

Zaman and A.L.
El-Helece: Elixir Chem.

El-kafrawy, Adel.
US Patent 4302252. 11/24/1981 [3] Orilall MC, Matsumoto F, et al.

The elemental composition of the chars was determined by using a Vario EL-2 elemental analyzer.
Cerrella and A.L.

Schottky barriers with a diameter of 1.2 mm and thickness of 80 nm on CVD layers and ohmic contacts on the opposite side were formed by thermal evaporation of Cr and Cr/Al, respectively.
The photocurrent was measured in short-circuit mode and the external quantum efficiencies (el/ph) of the devices were determined from values of photocurrent for both the unirradiated and irradiated samples at several temperatures in the range from 23oC to 180°C.

., Herbst A.L., Noller K.L., Titus-Erustoff L., Hoover R.N.: American Journal of Epidemiology, 154 (2001), p. 316
[4] Jan S.T., Devanesan P.D., Stack D.E., Ramanathan R., Byun J., Gross M.L., Rogan E.G., Cavalieri E.L.: Chemical Research in Toxicology, 11 (1998), p. 412

Zheng et al. [10] found that the addition of the P2O5 nucleating agent has the effect on the crystallization and microstructure of lithium disilicate glass ceramics.
El-Meliegy, R. van Noort, Glasses and Glass Ceramics for Medical Applications, Springer Science+Business Media, LLC 2012

In particular, nc-Si:H thin films exhibit photoluminescence (PL) and electroluminescence (EL) behavior at room temperature [3].
The crystalline volume fraction was estimated from Raman spectra using the procedure proposed by Tsu et.al [6].