Search results

With varying of mesh number of the stainless substrates, their Fe2O3 nanowire structures are systematically characterized.
The smaller wires had a significant effect on the smaller grain or seed size of the stainless steel, which had an impact on their diameter of the nanowires.
(d) (b) (c) (a) Figure 2 SEM images of nanowires growth on Mesh number (a) 40, (b) 60, (c) 80 and (d) 100.
Figure 3 Diameter of Nanowires on the difference mesh number.
The XRD pattern of nanowires on the mesh number 60 was shown in Figure 4.

Simulation program design of random loads In simulated drum cutting process, the following questions should be considered: (1) Simulating cutting pure coal and rock layers by corresponding mechanical model; (2) Determining location and number of rock sandwich according to geological data, simulated cutting rock sandwich by rock mechanics model; (3) Hard parcels are randomly distributed in the seam, but for a coal seam, its size, shape and location is determined [6].
Simulation and result analysis of random loads Taking a certain type continuous miner as an example, parameters used in the simulation are: drum diameter 0.915 m, drum width 3.35 m, rotating speed 38 r/min, cutting depth 0.58 m, boom length 6.445 m, swing speed 3.42 m/min; there is a layer coarse-grained sandstone along the seam, the upper and lower limit coordinates is:＝380 cm,＝350 cm; Parcels are sulfide type and distribution in Gamma function, there are 40, and the mean size of the long axis is 10 cm.
It can be found from results that loads of the drum are changing regardless of how is cut object, and there is significant volatility, which is reason of different pick number at each time, construction characteristics and physical properties of coal and rock.
Acknowledgements This work was supported by: 1National Natural Science Foundation-funded Project (59774033); 2Project of Creative Team for Liaoning Provincial Education Office (2007T068); 3Project guiding scientific and technological research of China Coal Industry Association (MTKJ-08-311); 4Liaoning Province Key Laboratory of large-scale mining equipment (the second batch of Science and Technology projects of Liaoning Province, 2008403010). 5Project of 2009 Safety Technology Development Program (Safety Production Supervision Bureau of Liaoning Province, the file number: [2009]88).

However, it is well known that the surface charge properties of different ceramic powders vary with the type of powder and in some cases even with the producer[7,8] ,so a number of studies on powder surface modification processing have been carried out.
Curve 1 is the spectrum of origin powder, the peak in the wave number 892.9 cm-1 is Si-N bond stretching vibration, while the 3474 cm-1 peak related with the O-H stretching vibration, due to hydrolysis of silicon in the air, which results of the O-H bond.
a c b Fig.3（a） The SEM of original Si3N4 powder Fig. 3 shows the morphology and grain size of Si3N4 powder without modifier and powders modified by tartaric acid and PEI.
At the same time we can see the powder modified with PEI are spherical trend, diamond, flaky particles significantly reduced the number of spherical particles increased significantly.

Patch is the gathering of species, and its type, scale, size, location, shape, edge and number not only have great influence on the structure of the landscape, but also have great effect on the ecological process.
During the operational process, it is necessary to consider seven ecological characteristics of landscape, such as large patches of natural vegetation, size of grain, the risk of proliferation, variability of gene, ecotone, small patches of natural vegetation, corridors, etc.
However, it can increase a small number of patches of agriculture between the large patches of natural vegetation and buildings.
For instance, in the construction of green area patches, great attention should be paid on the construction of large-scale green area patches, while arranging small green area patches as supplements; the more the number of green area patches, the higher the diversity of eco-system and species; the closer the connection between patches, the frequenter the species exchange in patches, the stronger capacity of resisting disturbance of the whole biotic population.

This comprised some 50% of the total number of contributions.
Vacancies at grain boundaries appeared to be shallow traps for positrons.
A number of other topics were studied, including: effects of the As-vapour pressure on vacancy concentration in GaAs, VSi in electron irradiated 6H-SiC, activation of dopants in B- and Al-ion implanted SiC, voids in Al- and N-ion implanted ZnO, Zn associated defects in GaP with Znimpurities.
Final Remarks In this conference there was a considerable number of contributions on metals and metal alloys, a little more, relatively, (23% of the total) than in ICPA12 (20%) [1].

High demands on the accuracy and quality become strict if it is necessary to manufacture elements with small-size periodic profile, for example, fine-grained tooth-wheels for transmission nodes or slots with a complex profile and etc.
The appearance and reamer in diameter of heavy-duty mill with the constructive feed (a); reamer in diameter of mill with “helical backing-off” (b) Тhis tool has a number of advantages and disadvantages, both in terms of operational characteristics or dynamics of the machining process as well as from the viewpoint of physical processes occurring in the zone of contact of the tool with the work-piece.
For example, increasing the feed per tooth by decreasing the number of teeth in the annular circular row should significantly reduce tool life, in the design of which axial constructive feed is laid.
A number of papers [3,4,5] has been devoted to the research in the field of the tooling design and tooling operation with constructive feed, however, the questions of their wear properties are not lit enough.

Fe % Cr % Ni % Mo % Mn % S % 64.46 17.556 11.889 2.482 1.490 0.017 The average size grain of the steel, as measured by scanning electronic microscope observation (Fig.1), is estimated to 10 µm.
Evolution of crack size vs number of cycles The figure 5 indicates that a decrease in the load frequency is accompanied by an increasing of the crack opening, over the whole fatigue test.
For a same number of cycles, the sample is much longer solicited mechanically and exposed to the chemical medium, for the low frequency than the higher one.
The time appears then a more significant factor than the number of cycles of corrosion-fatigue.

Magnesium wrought alloy AZ31B with average grain size of about 23 µm was used.
The number of cycles to first turning point was designated as Ni, crack initiation life, and the number of cycles to second turning point was designated as Nrp, which composed of crack initiation and slow propagation.
In order to normalize all the results obtained from different solution concentration, Table 1 summarizes the ratio of the crack initiation life Ni to the total number of cycles to failure Nf and the ratio of Nrp to Nf.

Cu-Ca alloys were vacuum induction melted to cast cylinder type ingots. 10~15% cold working of ingots by simple compression was done to get globular grains by SIMA mechanism during reheating of billets to semi-solid temperatures.
The design, the number and the size of slots should be varied if the capacity of induction motor is changed.
For example, the slot height and the slot number of 60W rotor core are reduced to 25 mm and 30, respectively, which will make the control of processing conditions easier.
The numbers on the micrographs mark the locations of microstructural sampling, that is,1 is the bottom and 5 the top of rotor.

ARIMA allows short-term and long-term forecasts ranging from one to an arbitrary number of steps ahead.
The Parameters of the ARIMA Model To succinctly describe non-stationary or seasonal series, the ARIMA M(p,q) model can be extended to construct general ARIMA models, allowing an arbitrary number of regular (d>=1) and seasonal (D>=1) difference levels.
The d, which is the number of differences needed to make the data stationary .In our case it was d=1 for all the plugins.
Lei lu-lu, Du Hong-fei Application of B-J Model for non-stationary time-serial analysis in deformation prediction Science of Sureying and Mapping 37(5): 207.209,226,( 2012) [3] Liu yangfang,Chen qihua,Ding linlei Application of combination gray model in deformation prediction Geotechnical Investigation & Surveying (1):58-60,( 2013) [4] Huo xin-lin, Chang ping-fan, Bai lei Time series forecasting of the trend of total food-grain consumption in china journal of shanxi agricultural univercity (social science edition) ,3(4):317-320, (2001) [5] Ni hai-er, Zhou rui-juan Combined Time series Models for the Dynamic Analysis of the Fisheries Resources journal of natural resources 26(6):992-998,(2011) [6] YAN Li- ping, LING Jian- zhong, LI Jian- sheng, et al.