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When the surface roughness continues to increase (Fig. 5c), the number of incident photons reflection times increases because of the deeper surface grooves and pits, resulting in a trapping effect.
In addition, the cladding layer is also grain Refinement Strengthened because of the characteristics of fast cooling and heating during laser cladding.

Research on Nitrogen Removal Performance of Leachate Treatment of WSIP Reactor Duan XiuJu1,2,a, He Qiang1, b, Liu YaLi1, c 1Chongqing University, Chongqing 400045, China 2Chongqing construction community, Chongqing 400014, China 3 Chongqing planning and design institute, Chongqing 401147, China a duanxiuju@126.com, b duanxiuju@126.com, c liuyali126@126.com Duan Xiuju: Male; PhD; Research on water treatment technic; Phone (fax) number: 023-63670156 Key words: Landfill leachate, Nitrogen removal, Sequential Batch, Nitrification and Denitrification Abstract: This thesis put forward the treatment concept of “without Biomass Retention Sequential Batch Intensified Pretreatment (WSIP)” in leachate treatment, for sake of improving performance of nitrogen removal, optimizing excess water’s nutritional ratio and benefitting the follow-up aerobic biological treatment.
The WSIP sludge in the period of domestication turn starchiness to garrulous shape, sludge grains are more big, sedimentation ability is fairly well.

Fig.1 and is grain size distribution curve of loess and compaction curve of loess.
When the moisture content is greater than one certain number and the free water appears in the soil.

Each household is less than an acre of land, planting vegetables, grain and cotton mainly.
The target of urbanization in Lijie town obviously ignore agricultural population numbers, the phenomenon of “Hollow Village” and industrial structure in present situation.

A broad and weak peak at a wave number about 210 cm-1 has been attributed to TiN phase.
For the film deposited at 40 sccm N2 flow rate, the above-mentioned features remained, but shallow and blunt grain boundaries appeared, as shown in Fig. 4(a).

.% alumina (200 MPa).This can be explained by the superior hardness of the alumina particles relative to the ductile Al-matrix, the refinement of the grain structure within the Al-matrix, and the obstruction of dislocation movement in the Al-matrix induced by the presence of alumina nanoparticles [18] [19].
The calculation of fitness value is accomplished by using GA programming in MATLAB platform by applying multi-objective optimization, with population size 100, number of variables which are weight percentage of alumina nanoparticles =1 PopInitRange [-1;1], ParetoFraction 0.1, Lower bound(LB) = 0, upper bound (UB)=10, and hardness, compressive yield strength and wear rate equations are applied as fitness functions as shown: Hv=(33.0005574750791+2169.23802417033*x)/(1+60.5373408734736*x+(2.35808221567289)* x^2) ; % objective 1 ; YS=139.5676049049+ (-38.6160004316183)*0.0827125645674813^x + 5.77256517969737* x ; % objective 2 ; WR=(3.49127323190855+0.233186567677515*x)/(1 + 0.293807440103305* x + -0.0185737691818809* x^2); % objective 3 ; Fig. 9 shows the running window in the Matlab program of GA optimization where the Pareto front represents multi-objective optimization.

The microstructure of CNTs cement-based composite materials was analyzed through SEM , found that the surfaces of carbon nanotubes in composite materials were coated by cement hydration products, the structure of CNTs cement mortar was close-grained.
There are a large number of scholars committed to the study of CNTs dispersity. [[] Jiang Linqin，Gao Lian．Effect of Chemical Treatment on the Dispersion Properties of Carbon Nanotubes．Journal of Inorganic Materials. 18 (2003) 1135-1138. ,[] Cwiren A, Habermehl-Cwirzen K, Penttala V.

However, synthesis factors can produce great influence on phase structure, grain configuration, degree of crystallinity etc.
The wave number of 3440cm-1 and 1637cm-1 is respectively the broad of peak stretching vibration and bending vibration of O-H.

A large number of stone chips and limestone powder are produced in the process of its mining and production.
Table 2 The specific surface area of ground limestone/m2·kg-1 Sample BET Ventilation CL400 570 326 CL800 1510 554 CL1250 1800 729 The particle size distribution and grain size distribution curve of these three kinds of limestone are shown in Figs.1~3, and the particle size distribution characteristics are shown in table 3.

At bottom of weld metal we may remark some transversal cracks, with size about 80-200mm and a hole between weld metal and parent metal, figure 8c.At high spot power, about 2, the parent metal has a dendritic structure, with different orientation of the grains with closed axes and big length (figure 9a).
Acknowledgements This work was supported by Romanian project number POSDRU /159/1.5S/132397, entitled “Excellence in research by doctoral and postdoctoral scholarships”.