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Ammonium nitrogen pollution is a key factor related to water eutrophication.
Biochar, a product through low oxygen thermochemical process of biomass, can be used for ammonium nitrogen adsorption, and further applicated as a tool to mitigate global warming and improve soil properties.
Ding et al. [4] investigated the biochar adsorption properties for ammonium nitrogen retention.
The vessels are shaken in the mechanical shaker for 6 h at 25˚C.
Initial solution pH can affect ammonium nitrogen removal from wastewater by biochar adsorption.

Abstract The knowledge and control of the structural and morphological properties of nanocrystalline silicon is a fundamental requisite for its proper application in photovoltaics.
The results showed that the nature of the film substrate induces deep changes in the structural properties of the deposited films.
Notwithstanding the large amount of work which has been done to study the structure and properties of nc-Si in the past few years, current scientific knowledge can not provide, however, precise correlations between growth parameters and optoelectronic properties, as the material features are subtly related to the specific deposition technique.
Raman measurements carried out with the 488 nm laser showed that for both sets the crystallinity of samples prepared with dilution factors lower than 20% is higher than 60% and almost uniform across the wafer.
The results have clearly demonstrated that the structural properties of the nc-Si films are strictly related to the substrate nature, particularly for high silane dilutions.

Elasto-Plastic analysis on Wellbore Stability under the Condition of Permeation Jianbing Sanga, Sufang Xingb, Chenhua Luc, Wenjia Wangd, Bo Liue* School of Mechanical Engineering, Hebei University of Technology, Tianjin, 300130, China asangjianbing@126.com, bsufangxing@sohu.com, cluchenhua0617@163.com, dikarugas@126.com, eliubo@hebut.edu.cn Keywords: wellbore stability, permeation, elasto-plastic analysis, SD effects Abstract.
Maintaining the wellbore stability is a key factor for oil and gas drilling operations.
Majority of rocks around wellbopre contain crevice fluid, which affect not only the mechanical properties of rocks but also the stability of wellbore.
Mechanical Model and Basic equation In initional condition, formation rocks are acted only by ground stress.
Fig1 is the mechanical model of well.

At the same time, the depth of micro-cutting and the increment of elastic and temperature deformations affect the values of the radial wear of the tool and the radial removal of the material.
Each of the subsystems has its own set of properties, state parameters, development history, vector of input and output variables, and vector of disturbing effects.
Changes in the cutting mode affect the maximum depth of micro-cutting.
Changes in the radial removal of metal, the wear of the wheel, the increments of elastic deformations and the depth of micro-cutting during one cycle during internal cylindrical grinding Conclusion Thus, a description shows that to predict the spatial position of elements of the technological system it’s necessary to have information about the quality parameters of the workpiece, the original profile of the tool and analytical models that define the relationship with the technological factors the depths of micro-cutting, radial, material removal, wear of the wheel, cutting forces, elastic and thermal strains.
Bogutskiy, Modeling of the process of stochastic interaction of a tool and a workpiece on grinding operations, Science-intensive technologies in mechanical engineering, 5 (2017) 9-18

The safety of pipelines depends on the high toughness of steels and the toughness of pipeline steels is a main factor on pipeline fracture.
However, it was found that besises pure steels and acicular ferrite that are the main factors for improving the toughness of pipeline steels, the grain size of polygonal ferrite plays important role in the shear-area percentage of DWTT fracture of pipeline steels.
,oC Rough rolling temp., oC Rough rolling temp., oC Cooling rate, oC/s Final cooling temp., oC 1 1220 1050 790 16 500 2 1220 1050 790 14 500 3 1220 1050 790 10 500 4 1220 1050 790 10 530 5 1220 1050 790 10 550 Table 2 Mechanical properties of X70 pipeline steel No.
Thus it can be seen the portion and the size of polygonal ferrite greatly affect DWTT fracture toughness.
Conclusions (1) The shear-area percentage of DWTT of X70 pipeline steel is affected by the content of polygonal ferrite.

Zhang et al [9-10] studied the composition optimization and mechanical properties of Al-Mg-Si cast alloys.
Table 1 shows the factors and levels of the orthogonal test (five factors and three levels), while Table 2 illustrates the optimized chemical composition of the investigated alloys.
The initiation produce of cracking was affected by strength of material.
These factors resulted that the OA alloy had better thermal fatigue behavior than that of ZL101 alloy.
These factors resulted that the thermal fatigue resistance of OA alloy was superior to that of ZL101 alloy.

The permeability of these mixtures is also strongly affected by the technology behind their production because they are manufactured to achieve maximum density according to the Proctor test [4].
Table 1: Physical-mechanical parameters of used Liapor aggregates Property/Aggregate 1-4/500 4-8/450 8-16/275 Bulk density - loose fill [kg·m-3] 490 460 273 Compressive strength by compression in the cylinder [N·mm-2] 3.0 1.7 0.6 Void space – loose fill [%] 34.8 40.3 44.8 Absorption [%] 5 minutes 11 8 6 30 minutes 13 10 8 60 minutes 15 12 10 120 minutes 17 14 13 total 30 25 25 Table 2: Physical-mechanical parameters of used natural aggregates Property/Aggregate 0-4 Bulk density - loose fill [kg·m-3] 1550 Density [kg·m-3] 2660 Void space – loose fill [%] 41.7 Absorption [%] 5 minutes 0.4 30 minutes 0.4 60 minutes 0.6 120 minutes 0.6 total 0.7 The results show a significant difference between the values of absorption for natural and Liapor aggregates.
From the point of view of the design of the sub-base mechanically strengthened or cement-bonded mixtures, absorption in the short term is a significantly important factor in predicted retention capacity.
The results of the absorption and other physical and mechanical properties of the mixtures are shown in Table 4.
This factor is significant for the immediate capture of rainwater.

Relative displacement value at both ends of the structure component is the main factor affecting the structure of the normal use, also not to be ignored.
The dynamic mechanical model of soil mainly includes linear visco-elastic model, nonlinear elasticity and plasticity model and equivalent nonlinear visco-elastic model.
Reflex of wave was produced in artificial boundaries and affect the wave’s freedom propagation.
As a result of the relative stiffness at the ends of the pillar is larger than it in the roof plate and the middle of bottom plate, the side wall has deformation caused by the soil pressure around; the peak accelerator of the seismic wave is the main factor that affects the maximum relative displacement in structure components.
Although damage on small structure, the structure of normal use, it will affect the relative displacement of big.

Bubble in RMC is one of the key influences on compression strength, its amount and distribution determines the overall mechanical properties of the composite directly.
Mechanical model of single raised bubble in micro cylinder channel is established based on the flow characteristics of non-newtonian fluid.
How to minimize vibration during manufacturing process is now an important factor that affects machining precision [1].
Compared to cast iron, RMC has ten times the vibration alleviating properties, which is suitable for machine tool bed [2].
Meanwhile, due to the changed viscosity property of resin matrix, internal friction is existed between the bubble and resin matrix.

Double targets magnetron sputtering codeposition V - C - the structure and mechanical properties of Co films [J].
Unbalanced magnetron sputtering deposition type of graphite carbon film structure and tribological properties [J].
Magnetron sputtering of ZrAlYN coating prepared by the structure and properties of [J].
TiAlN/AlON microstructure and mechanical properties of nanometer multilayer coatings research [J].
Ti6Al4V alloy type of diamond film on the tribological properties and corrosion behavior [J].