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Finally, they apply the resonator on the noise reduction of outdoor ventilation, and explore the influence of resonator on the environmental noise reduction by simplifying experiments.
Also, the experimental data are obtained by acoustic pressure standard measurement of CNS-8753[5].
It is esay to find that noise reduction occurs at 2nd BPF again, and there is a maximum noise reduction for 2.7 dBA at H5G30.
However for 1st BPF, there is no obvious noise reduction for all cases.
H.: Reduction of Centrifugal Fan Noise by Use of Resonator.

Research background Data reported by the Ministry of Housing and Urban-Rural Development of the People’s Republic of China(MOHURD) shows that 3513 wastewater treatment plants have been put into operation in China by September 2013[1].
Literature search and on-the-spot investigation show that the study on the way of concentrated activated sludge reflow used in energy saving and consumption reduction at home and abroad is still back.
Feasibility of concentrated activated sludge reflow process used in energy saving and consumption reduction of small and medium-sized wastewater treatment plant is verified through comparing water quality and technical indicators.
Pilot effect of concentrated sludge reflow instead of secondary settling tank reflow used in energy saving and consumption reduction Based on laboratory study, the author selected two wastewater plants as the pilot unit.
The data of operation for 20 days shows that effluent quality initially fluctuates significantly and tends to be stable in later period.

Then the author stressed the physical and chemical characteristics of the produce of NOX in waste gas and the prevention and emissions reduction.
Among them，the article expounded the principles, process and application status of the reduction of ammonia nitrogen removal, and give it a simple evaluation.
According to the in complete monitoring data, it is between 800 to 1600mg/Nm3, it doesn’t live up to the national standard GB4915-2004 and EU standard 2000/76/EC.
SCR is a developed practical technique of great potential, SCR can assure that the concentration of NOx in waste gas decreases to 100~200mg/Nm3.The effect of NO2 emission reduction can be as high as 80% to 90%, and unlike SNCR, its emission reduction performance won’t be affected by the mass shaping of cement kiln scale.
Discuss on the technology of NOX emission reduction in cement plant.

After determination the times of spectrum analysis data as shown table 1.
From table 1 the times of spectrum analysis data, each monitoring point was above the national minimum standard of noise.
Noise value of the main suction cabinet and times frequency spectrum analysis measurement data as shown tables 2 and 3.
Therefore, after the noise reduction transformation, the noise value of the main suction cabinet is reduction of 9.5dB.
Therefore, after the noise reduction transformation, the noise value of the main suction cabinet is reduction of 9.5dB.

It follows from the obtained data that the hot working with the following accelerate cooling under industrial conditions does not develop a tendency toward corrosion cracking in 3% agueous NaCl solution.
This is confirmed by experimental data for the effect of steel chemical composition and heat-treatment schedules on its tendency toward ICC.
With an increase in dislocation density a tendency is observed toward a reduction in corrosion rate (Table 2).
In contrast to data obtained in [9] for a similar steel given TMP, the grain size and overall amount of carbide phase in this case has almost no effect on ICC.
It follows from data in Table 2 that steel TMP-worked under industrial conditions practically does not develop a tendency toward corrosion cracking in 3% aqueous NaCl solution.

To achieve the goal of reducing 40%-45%, the amount of reduction of emission are 7.28-8.19, 6.38-7.18, 5.49-6.18 billion tonnes separately.
Table2 The amount of emission and reduction in three situations (a hundred million tonnes ) Goal of emission of carbon intensity The total discharge of emission The amount of reduction High Middle Low High Middle Low 2005 50.6 50.6 50.6 -- -- -- Remain unchanged 182.6 159.5 137.9 -- -- -- Lower 40% in 2020 109.8 95.7 83 72.8 63.8 54.9 Lower 45% 100.7 87.7 76.1 81.9 71.8 61.8 If the energy technology can reach or approach advanced international standards, a great change happens in structrue of energy, then 72%~81% of the goal of reducing 40%, 64%~72% of the goal of reducing 45% would be achieved, moreover, other measures to energy conservation and emission reduction need to take.
MODEL DESCRIPTION AND DATA SOURCES The basic structure of the energy- environment-economic model is on the basis of model of Lofgren(2002), added energy and made it dynamic in the plate of technology of production., energy embedded in the model as: substitution between energy firstly , then energy substitute for capital, lastly energy substitute for labor , the relation of substitution are described by the function of constant elasticity of substitution(short for CES).
The basic data of the model are the social accounting matrix table in 2007 established through data of input-output table in 2007 and corresponding customs, tax revenue, international payments and flow of funds in 2007.
From the results, the situation s2b and s2d effect the reduction in some degree.

Data acquisition system allows continuous introduction of corrections and rapid response to emerging issues, which in turn leads to reduction of losses and increases company's competitiveness on the global market.
Presence of automated equipment (PLC, HMI/SCADA, etc.) with standardized network interfaces significantly improves possibility of data acquisition, allowing fully automated data acquisition, requiring only pre-processing, basic aggregation, reduction and archiving of the data.
Scheme of data acquisition using the Mistrz system Data collectors are placed in the data acquisition cells in separate areas of the production hall, common for a few workstations.
Operation of the Data Acquisition System.
Sometimes workers forget to confirm the operation or enter incorrect data, despite of the data validation.

This paper will discuss what are cloud computing data centers, cloud computing data center construction, cloud computing data center architecture, cloud computing data center management and maintenance, and the relationship between cloud computing data centers and clouds.
Cloud Computing Data Center Construction Construction of cloud computing data centers is a system, a complex and iterative process.
Data Storage and Backup.
The data handled by user are not stored locally, but in the data center of the Internet.
All the data is handled remotely.

And assessment data acquisition difficulties, the assessment field dependence and confidentiality are strong; Assess needs more and more.
Node conditional probability can be determined by learning a large number of sample data or the knowledge of experts in the field.
Attribute Reduction Algorithm attribute dependence progressive genetic reduction based design method.
For building assessment model, we compare SASR with CTR data table in literature [5], setting that fitness function is calculated based on the dependence and genetic algorithm takes optimal preservation strategy.
When the number of instances of the data sets and the number of original attributes are less, the advantage of SASR on the time complexity is not yet clear, but when increasing the number of instances of the data sets and the original number of attributes, the advantage of SASR on the time complexity gradually shows up.

It understands knowledge as data partition.
Data Discretization Rough set can only analyze and process the discrete data.
So need to standardize the attribute data and convert it to dimensionless data.
Then disperse the continuous data.
Attribute Data Discretization and Attribute Reduction Disperse the data in table 1 with the method of equidistance, and reduce sample data which have the same decision rules.