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The interval is three minutes; ③ Open the equipment and count after the end of the sampling; ④Observe the time used by half reduction of each concentration count, namely the half time TH.
The curves of the half time of aerosol particles of which the diameter is over 0.3μm, 0.5μm and 1.0μm are fitted out through a large number of experimental data when the high voltage and high frequency complex electric field works or the high voltage and high frequency complex electric field and the filter work together, providing a theoretical and experimental basis to remove sub-micron-sized particles in an air-conditioned room as well as a reference for the engineering design.

This dielectric as-grown crystal has been well documented to be converted into n-type semiconductor by doping with the donor impurities that represent the III group elements and subsequent thermal annealing in the reduction atmosphere with a colouration revealed during this process (Fig. 1) [1, 2, 4].
The density of states in the CdF2 valence band revealed by the I-V fine structure is in a good agreement with the data obtained using the photoemission technique (Fig. 2) [7-10].

Today the production design demands the improvements of the customers’ satisfaction and the product quality, and the reduction of design cost and the design cycle.
This paper combines AutoCAD and Technology of Data Base, and we have realized the modular design of the cold feeding extruders.

ZrC and 3Si powder mixtures were first milled in a high-energy ball mill, Milling resulted in a significant reduction of grain size.
The structure parameters, i.e. the average grain size of silicide and SiC are obtained from XRD data by Strokes and Wilson's formula [5] and the SiC particles were well distributed in matrix, ascertained by SEM image of shown in Fig.3 (c).

Fig.1 The screw configurations on mixing section for screw No.1~5# Results and discussion The experimental data is shown in Table 1 and the result will be discussed separately in the following part.
For screw NO.5#, we substitute a group of GFA for the first group of KB, which results in a significant improvement on delivery ability and sharply reductions of the residence time and shear strength, so that the fiber length is the longest one.

Such a set-up is desirable as it enables tight control of power devices in extreme environment and size and cost reduction with respect to packaging.
These circuits have been successfully tested at ambient room temperature and high temperature performance can be extrapolated from temperature dependent DC characterization data.

T[℃] Young’s modulus E[Mpa] Yield strength σ0.2[Mpa] Fracture limit σb[Mpa] Elongation Δ[%] Reduction of area Ψ[%] Poisson ratio μ 25 2.034E5 382 636 26.35 6.85 0.3 400 1.761E5 345 574 20.35 48.57 0.3 Fig. 1 The geometry of specimens Test Condition and Method.
Test Results According to the experimental data, the relationship between the fatigue life (Nf) and the loading strain range (Δεt) on the log-log scale were shown in Fig.2.

At present, no quantitative data is available to determine the effect of Mg on surface roughness of the composite layer.
The reduction in the crystal size of the flakelike crystals was due to the inhibitory effect of Mg on the crystal growth of apatite.

Application of “fmincon” function optimization, finally got 150 group optimization solution.After screening, leaving 10 group data ,as shown in table 1: Tab.1 Groups of optimal results n x1 x2 x3 x4 f 160 183.723 1 290.089 4 661.498 6 61.409 2 -14.841 3 161 190.760 4 274.232 2 660.3 65.186 7 -14.190 1 92 192.196 9 273.206 4 662.616 8 68.521 5 -14.099 8 89 162.785 2 265.157 4 601.704 6 97.547 2 -14.779 6 78 185.534 4 351.146 0 747.205 8 165.677 1 -15.687 1 56 180.020 3 396.707 7 784.816 8 182.109 1 -16.962 6 55 179.630 5 397.983 3 785.349 0 182.365 7 -17.012 0 53 178.849 1 400.535 8 786.409 5 182.873 7 -17.111 6 52 178.457 6 401.812 6 786.938 0 183.125 4 -17.161 7 50 177.684 9 404.359 0 788.017 2 183.658 2 -17.261 8 Determination of the basic parameters Fig.2 Geometry relationship of pins Select n=78 group from the table used to calculate.
[3] Zhaowen Li,Yong Wang.Study on Noise Reduction and Vibration Damping of Roller Chain Systems.

The microstructure and mechanical properties of TA1 in two rolling proess are studied and compared in order to obtain the influence of electropulse on the microstructure and properties of TA1 and provide useful data for production.
While rollers are at room temperature and put through electropulsing, the pulse power source was applied to discharge unidirectional pulses with frequency (f=100Hz), peak current density (Im=80A/mm2) and duty ratio (D=80%), TA1 sheets were heated to 450℃ and synchronous rolled to 1mm at last, reduction in each pass is 0.1mm, roll speed is 10 r / min.