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DuPont et al. tested steel grade 23 in both tube form (T23) and pipe form (P23) and observed that the drop in strength and hardness at higher temperatures after aging during creep [9].
Sohail et al. researched on the damages in alloyed superheater and reheater tubes steels for natural circulation water wall tubes high-pressure drum boiler units and confirmed that microscopic irregularities were observed as the scale surface and huge pits were also observed [10].
Area for microstructural observation Results and discussion Results of the tensile test were given in Table 2, in which there was no clear change in the elongation (EL) of all specimens.
Mechanical properties of the initial and loaded specimens Specimen Loading condition Strengths and elongation Stress (MPa) Time (h) UTS (MPa) YS (MPa) EL (%) D 0 0 481 325 22 A1 6.45 2160 488 378 21 B1 9.68 2160 553 380 23 C1 12.9 2160 605 402 23 B2 9.68 4320 456 335 23 C2 12.9 4320 446 340 23 Fig. 4.
Cardoso et al. observed an extraction replica of the 2.25Mo-1Mo superheater tube by transmission electron microscopy, as expected, presence of pearlite in the initial tube was confirmed and there were several regions composed by the M3C precipitate [16].

Reineck et al. [1, 2] presented the high-current d.c. arc plasma process (HCDCA) for deposition of diamond coatings on cutting tools.
Dagiloke et al. [8] developed a software package to describe high-speed machining applied to a number of metal cutting operations.
El-Wardany et al. [10] dealt with an experimental and analytical investigation into the different factors which influence the temperature distribution on ceramic tool rake face during machining of difficult-to-cut materials.
Sutter et al. [12] designed a new high-speed machining experiment to obtain orthogonal cutting in a wide range of cutting speeds up to 100m/s.
El-Wardany, E.

Effect of Firm Characteristics on Sources of Supply and Demand Risks: An Empirical Investigation on Moroccan Industrial Firms Mariam EL HIRIa*, Abdelali EN-NADIb and Anas CHAFIc Faculty of Sciences and Techniques, Laboratory of industrial techniques, Sidi Mohammed Ben Abdellah University, FEZ, Morocco amariam.elhiri@usmba.ac.ma, bennadi.abdelali@yahoo.fr, canaschafi@gmail.com Keywords: supply risk, demand risk, source of risk, supply chain, factorial correspondence analysis Abstract.
Xiaohui et al, ranked the sources of risk in three categories, the item character, the market character and the customer demand [16].
[10] Mariam EL HIRI, Abdelali EN-NADI and Anas CHAFI. (2018), Risk and Performance within Supply Chains - Case of Moroccan Industries- International Journal of Engineering Research in Africa, Vol. 34, pp 189-197 [11] Safaei, A.

With the advent of the fact that rheologic properties and the flow behaviour of blood are of immense importance in the fundamental study of arterial stenosis, Shukla et al. [6] have studied the effect of stenosis on the resistance to flow through artery by considering the behaviour of blood as a power-law fluid and a Casson fluid.
A theoretical model for sedimentation of red cell aggregates in narrow horizontal tubes has been proposed by Secomb and El-Kareh in which they modelled the core region as a solid cylinder moving inside the tube [8].
Secomb, A.W. el-Kareh.

Bahig El-Deeb extracts the bacteria from aquatic plants which can enrich heavy metal, identifying effect and mechanism of many kinds of bacterium on adsorption of heavy metals[9].Also, some scholars use electrospun nanofibrous Membrane[10], succinic anhydride modified mercerized nanocellulose[11], modified diatomite[12], beech sawdust[13], etc, and they all obtain some good achievements on research.
[8] Mohamed Abdel Salam, Ghalia Al-Zhrani, Samia A.
[9]Bahig El-Deeb,Youssuf Gherbawy,Sabry Hassan.

After annealing, CiOi and VO reduced with the increase of 1109.2CiOi 604.8Cs 1020.4CiOiI 862.3CiOi 830.5VO - 0.005 - 0.004 - 0.003 - 0.002 - 0.001 0 0.001 0.002 0.003 0.004 0.005 500 600 700 800 900 1000 1100 1200 Wavenumber (cm- 1) Absorbance 0 0.0005 0.001 0.0015 0.002 0.0025 0.003 12 13 14 15 16 17 log (dose) absorbance el VO el CiOi He VO He CiOi Fig. 4 Absorption spectra of He irradiated samples (top: 5x10 12 /cm2, bottom: 5x10 13/cm2).
Londos et al. had reported the emergence of the line at 945 and 964 cm-1 between 230 and 330 oC [11].

A series of situations have been simulated, including the void growth, the grain growth, the super plastic deformation et al.
Substituting (eq.4) in to (eq.3), the discrete element form becomes ( ) ( )ln / 1 : e e e v e e V s V dKT c c d E dV u ds W dV dt dt λ λ σ ε     Ω        = − + − +               ∑ ∫ ∫ ∫ & && p (5) here we use λ to denote the element attribution, 1 0 λ  =   ，boundar y el ement ，i nt er nal el ement (6) following Suo's theory[6], we assume that the velocity induced by diffusion is proportion to the driving force.

Previous work by Santos, et al [3] showed that titanium nitride layers without cracks and low roughness can be produced onto titanium substrates by laser gas nitriding by controlling laser and processing parameters.
The energy per line, El, is calculated as El = Pav/v, where Pav is the average power and v is the laser scanning speed.

Tab. 1 Data for box beam of bridge(*MAT_CSCM) /kg/s/m MID RO NPLOT INCRE IRATE ERODE RECOV IRETRC C50 2550 1 0 1 1.1 1 0 PreD 　 　 　 　 　 　 　 0 　 　 　 　 　 　 　 G K α θ λ β NH CH 1.8×1010 2.1e10 15.16 0.3143 10.51 0.01929 　 　 α1 θ1 λ1 β1 α2 θ2 λ2 β2 0.7473 1.2×10-3 0.17 0.0646 0.66 1.2×10-3 0.16 0.065 R X0 W D1 D2 　 　 　 5 93.31 0.05 2.50×10-4 3.49×10-7 　 　 　 B Gfc D Gfs Gft pwrc pwrt pmod 100 11.0×103 0.1 106.0 106.0 5 1 0 η0χ Nc η0τ Nt overc overt Srate repow 1.13×10-4 0.78 6.71×10-5 0.48 3.25e7 6.2×106 1 1 3．Explicit Analysis on the Bridge during Strong Earthquake The analysis was performed by the ground motion of EL-Centro earthquake record, as shown in Fig. 4.
Result Analyses Fig. 4 EL-Centro Wavetwo-dimensions The collapse Process of the bridge is simulated by LS-DYNA971 during the strong earthquake.
Zhou,C., et al.

The input motion consisted of the components of N-S, E-W, U-D of 1940 El Centro and 1995 Kobe earthquake wave respectively.
• Case No.21: Inputted 1940 El Centro with peak acceleration 3.88g in X-direction and 3.29g in Y-direction
References: [1] Shu-biao Yang, et al.