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The solid state reduction of hematite to Fe3O4 and FeO has been observed after 120 hours of MA by a planetary ball mill.
In this way, we can point out what is the uniqueness in the solid state reduction by MA in the Fe2O3-C system.
Furthermore, it should be noticed that the magnetite is already produced after 20 h of milling as is clear from the saturation magnetization, which is invisible by X-ray diffraction data shown in Fig. 3.
Hence, it turns out that the magnetic data can supply a better understanding of the amount of magnetite phase produced by ball milling.
Conclusions The present work evidently shows that a solid state reduction is occurred by MA using a high energy mill in Fe2O3-C system, despite the fact that the chemical reduction of Fe2O3 to Fe3O4 and FeO by graphite is characterized by a positive reaction heat.

These days, the rough set is usually used to deal with mass decision-making data.
It can make attribute reduction for large numbers of data to find the foundation.
If B is an attribute reduction set, then.
Experiments and discussion The data sheet in literature [4] is a table for fault decision-making for a certain weapon system.
There are about six decision-making reduction sets. .

Next, taking the achievements of students who are in the first semester of the freshman year (data of four-term students with the same course types and numbers; the corresponding relation of course and credit is shown in Table 1) and studying in mathematics major of Beijing University of Science and Technology (USTB) as an example, the simulation is carried out with the above method.
Taking the achievements of students in first semester of the freshman year and USTB mathematics major as an example, this paper evaluates the mean vector and covariance matrix of  multi-dimensional normal distribution with historical data (see Table 2 and 3).
Finally, the total credits achieved by students, the distribution law and cumulative distribution law, and the deviation with actual data can be worked out, as shown in Table 6, Fig. 2 andFig. 3 are the comparison of two distribution law curves and two cumulative distribution law curves.
Therefore, this paper adopts control variable method, which has higher efficiency in variance reduction techniques, to conduct variance reduction so as to reduce the random fluctuation.
The credit value found by several groups of simulation has relatively big fluctuation, for which variance reduction can be carried out through adopting the variable control method in variance reduction techniques.

Data Selection.
Data Pretreatment.
The reprocessing of the data generate in the previous step, check the integrity and consistency of the data, processing the noise data , Using statistical methods to fill the missing data.
Data Reduction.
Data Mining.

Cu-supported on Sodium-treated Sepiolite for Selective Catalytic Reduction of NO by Propylene Zhihao ZHANG1, Yang LI1, Yunfang QI1, Qing YE1,a*, Shulan Ji1 and Dao WANG1 1Key Laboratory of Beijing on Regional Air Pollution Control, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China ayeqing@bjut.edu.cn Keywords: Selective Catalytic Reduction of NO by Propylene; sepiolite; Cu Abstract.
Selective catalytic reduction with hydrocarbons is one of the most extended and efficient commercial DeNOx processes for nitric oxide removal from stationary sources.
Reports on a large number of catalysts for the selective catalytic reduction (SCR) have appeared since 1990, being the majority of these catalysts ion exchanged zeolites [1].
Catalyst Surf.area (m2/g) CuO cry. size (nm) a Cu2O cry. size (nm) b The peaks of H2-TPR Tmax (oC)/ NO conv. (%) Sep 57.6 - - - - Na-Sep 64.7 - - - - Cu /Na-Sep 60.9 18.5 7.8 310/380/540 350/35 a The data were estimated according to the Scherrer equation using the FWHM of the (111) line for CuO b The data were estimated according to the Scherrer equation using the FWHM of the (111) line for Cu2O Acknowledgments This work was supported by the National Natural Science Foundation of China (Grant Nos. 21277008 and 20777005), the Project of Construction of Innovative Teams and Teacher Career Development for Universities and Colleges Under Beijing Municipality (IDHT20140504) and Beijing City Board of Education Science and Technology Development Program (KM20131 00050010).

A significant reduction of the data exchanging between the server and the browser brings a faster response speed.
Ajax data processing is shown in Figure 3.
XML data encapsulation method is used in this paper to improve the Web data processing capabilities, and the DOC object used achieves dynamic display of the content on a page.
Research of Not Refurbishing and Updating Data Method in AJAX Web Application.
Data exchange applied research on AJAX[J].

It is mainly for processing and analysis of the collected data, among of which, the correlation analysis of the collected data can be used to verify the feasibility of the system.
The remote control center is mainly responsible for starting the data collection, receiving raw data, and making a certain pretreatment and display, meanwhile sending the processed data to the analysis center when having an abnormal alarm.
This paper focuses on the research of the analysis center system, for processing and analysis of data collected, including the correlation between the signal noise reduction and signal analysis and research [5].
So, the noise reduction processing is very important before signal analysis.
Taking the strain data and temperature data as samples, the correlation coefficient of them is calculated and analyzed and compared with different algorithms.

The experimental data show that: The yield ratio of the Q460C was found to increase with the elongation at break A and the reduction of area Z decreasing while the plasticity and toughness decrease as the testing temperature drops.
The Comparison of Strength Index of Experimental Data with Parameter Fitting.
But it is great deviated from fitting data below -20°C.
The experimental data is as following fig.8.
(2) In comparison with the data of fitting formula, the experimental data is more adverse to the application of Q460C steel.

The data outside intrinsic dimension space will be regarded as noise signal to be eliminated.
Finanly the process of global array by affine transformation will be replaced by mean reconstruction,the data after denoise may be obtained in the inverse process of the phase space reconstruction.
The data outside intrinsic dimension space will be regarded as noise signal to be eliminated.
Finanly the process of global array by affine transformation will be replaced by mean reconstruction,the data after denoise may be obtained in the inverse process of the phase space reconstruction.
In this experiment, vibration acceleration data with color noise is collected from cantilever fan in an aluminum company.

Application of Auxiliary Antenna Elements for SAR Reduction in the Human Head M.
This technique provides approximately 20% reduction in the SAR value as well as 2.8 dB reduction in antenna received power [6].
SAR reduction depends on the size and shape of ferrite material also.
The results reported in [12] indicate 57.75% SAR reduction.
Carlberg, "Cell phones and brain tumors: a review including the long-term epidemiologic data," Surgical neurology, vol. 72, pp. 205-214, 2009