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Online since: September 2014
Authors: Bao Jun Cheng, Li Li Jia, Xiong Wu, Jia Chao Lin, Yuan Peng, Yu Xin Gao
Compared with C0, the rheological properties of C1 which has the same amount of cementing material while with no zeolite powder, little cement and more microspheres is quite different , which is especially evident in yield stress and viscosity reduction.
Figure 5 shows that when the zeolite powder content is less than 4% , zeolite powder’s addition has greater impact on compressive strength at early age but less impact at later age according to the C1~C4’s data.
When the addition of zeolite is 4%, the compressive strength reduction of concrete at 3d, 28d, and 56d is 11.2%, 8.1%, and 4.5% compared with standard concrete.
When the ratio of zeolite powder is 2% (C3), the self-shrinkage reduction of group C1 at 1d, 3d, 7d and14d is 77.1%, 49.6%, 44.0% and 38.1%respectively.
The reduction electric flux of group C3 at 28d is 18.5% of that of group C1, showing that the effect of zeolite powder’s self-curing can improve the chloride-penetration resistance of concrete.
Online since: October 2013
Authors: Rong Qiao Wang, Wu Lin Si, Dian Yin Hu
This model was used to analyze the dynamic response considering dry friction damper by Griffin[3], Oden [4][5] which fits the experiment data.
Same operation is required for all corresponding nodes on contact surface Firstly, normal forces of nodes on contact surface is computed by static analysis and an array is defined to store the data; shear and normal contact stiffness formulas are deduced based on Greenwood-Williamson Model and Hertz contact whose equations show closely relationship with normal force [13].
Simulation Results and Comparison with Experimental Data The test system [14] for measuring the dynamic response of blade with assembled dovetail attachment is shown in Fig.6.
In addition, maximum reduction ratio (51.16%) is obtained when f=77Hz according to peak value of green curve (0.518mm).
In Fig. 9, numerical frequency (red with rectangle) fits experimental data (blue with circle) well, while maximum error is 1.43% at centrifugal force equaling 0.95KN.
Online since: July 2013
Authors: Yuan Zhang
Some data shows that 80% of purchase cost of an enterprise is concentrated at 20% of purchased products and varieties.
Meanwhile, the data sharing between buyers and sellers can be realized by relying on network platform.
A part of carbons is utilized in the production of methyl alcohol, in which carbon emission reduction relative to power generation by direct coal burning is realized, but still not enough.
To further make use of carbons and realize more emission reduction, carbon use can be more highly realized by using carbon capture technology or developing the organic products such as containing coal-made ethylene glycol and olefin longer carbon chain.
Realization of data consistency can promote all branches of a group to efficiently share data, improve customer service, and speed up capital turnover, save communication cost, and increase work efficiency and economic benefits.
Online since: July 2015
Authors: Antônio Gilson Barbosa de Lima, W.M.P. Barbosa de Lima, J.C.S. Melo, Wilton Pereira Silva
Among the different methods for reduction of moisture in solids we can cite the drying.
The values of the parameters hm, kl and kv were obtained by agreement between numerical and experimental data of average moisture content, using the least square error technique, as follows: , (11a-b) where ERMQ is the least square error, is the variance, n is the number of experimental points and is the number of estimated parameters [13].
The numerical values of the mean moisture content of lentil obtained in this study were validated by comparing with the experimental data reported by Tang and Sokhansanj [17], as shown in Fig. 2.
We can see that there is a good agreement between experimental and numerical data.
Excessive localized drying and heating for a certain amount of time reduction grain quality.
Online since: July 2007
Authors: Yves Bréchet, John Dunlop, B. Decreus, Hatem Zurob
The recovery data is summarized in Figures 1a and 1b.
The activation energy, Ua, and activation volume, Va, for the recovery process were adjusted to fit the experimental data.
The experimental data was fitted to the Verdier et al model [11] using Ua = 175kJ/mole and Va = 24.5b3.
Data was fitted using Ua = 155kJ/mole and Va = 20b 3.
The second pre-recovery treatment was of 65hr duration and resulted in a 50% reduction of the stored energy.
Online since: September 2011
Authors: Wen Cheng Jin, Hong Yin Yang, Shan Shan Xia, Wen Huang
Then the sample was suffered from a strain rate of 0.01/min until the fibers broken completely, so as to collect the load-displacement data of the fiber bundle when the stress exceeded 10N.
Tab.1 Average value of carbon fiber bundle tension test sample length 5cm 10cm 15cm 20cm Fb(N) 0.08481 0.08070 0.07939 0.07830 L(mm) 50.4 100.3 149.2 199.9 The dimensions of the statistic data were removed and the reference scale was assumed to be 1cm.
Take the logarithm of the data so as to obtain the fitting line equation by least square method.
Length will lead to the reduction of strength, so fiber rope is unfit for bearing members which is too long.
The strength discreteness of fiber bundle in experiment is much greater than the calculated value, so strength reduction should be made in designing.
Online since: May 2012
Authors: Xiao Jie Chen
Fig. 3 Engine noise (source Rolls Royce data).
The specific data is shown in Table 1.
Emission data for all aircraft and engines is published by FAA and other regulatory bodies.
Nevertheless, the industry continues to make advances in the reduction of emissions by improving energy efficiency.
Taking road transport (mainly cars) as a datum (100%) source of energy per seat kilometre, rail uses less than 70% and air about 55%.
Online since: October 2015
Authors: K. Sumeru, Farid Nasir Ani, Henry Nasution, Triaji P. Pramudantoro
As a result, a reduction of input power on the compressor leads to energy savings in the A/C.
First, the measured data were taken on the air conditioner which was operated with R290 as working fluid and using mineral oil lubricant without nanoparticle.
To obtain the cooling capacity and COP, the measured data are plotted in P-h (pressure vs. enthalpy) diagram as shown in Fig. 1.
(4) (5) The input power reduction due to nanoparticle in the lubricant is calculated by Eq. (6)
Using Eq. (6), the input power reduction on the air conditioner using nanoparticle in the lubricant is 3.1%.
Online since: June 2010
Authors: L.A. Japaridze, G.S. Abashidze, N.M. Chikhradze, Fernand D.S. Marquis, L.M. Okujava
The task of cost reduction may be solved through application of the less expensive materials in comparison with carbon fibres.
An application of hybrid reinforcing fibers and of strengthened matrix will permit a considerable reduction of the blade cost without significant loss of physical-mechanical properties of the material.
Data in Table 1 are the proof of the mentioned advantages of autoclave method of hybrid composites.
Figure 4 Increasing of strength and elasticity characteristics of composites as a result of reinforcement of matrix with mullite-similar addition - series C; - series D According to data given in Fig. 3, substitution of carbon reinforcing structures for basalt ones leads to the maximal drop of strength and elasticity modulus on tension accordingly by 46% and 32%.
The substitution of 20%-40% high-strength and high-modulus carbon fiber for high-strength basalt in hybrid polymer composite provides an acceptable reduction of strength and stiffness in tension and compression allowing its use in wind power turbine blade applications. 2.
Online since: August 2014
Authors: Wu Fen Chen, Wan Ceng Hu, Jia Jia Xia, Chao Lei Duan, Song Song Yang, Ai Lian Liu
IT has the ability of all-weather, all-day, large area, the distance to obtain real-time high-resolution image data.
If it has not the additive noise component, When compared with the details of target the radar imaging system resolution is smaller, the sampling interval of the speckle noise pollution is big enough, and a pixel quality of reduction are independent of each other, the SAR image speckle noise model can be simplified as multiplicative noise model.
Fig 1 Improvement of denoising algorithm flow chart spot 2 Experiment results and analysis of SAR image In order to evaluate denoising effect, we need not only evaluation of the noise reduction effect from the visual perception, also need the objective evaluation index of noise reduction effect, the real SAR images, the commonly used evaluation indicators are: smooth index FI; Edge to keep index ESI;equivalent number of looks ENL; Histogram test filtering effect; The mean value; Standard variance; Edge to keep index (FOM); Peak signal-to-noise ratio (PSNR); The mean square error (MSE), and the signal-to-noise ratio (SNR).
This paper adopted two evaluation indexes to do detailed analysis to the result of the filtering, the data listed in table 2, and the corresponding edge detection image as shown in figure 4 C From figure 2 and figure 3and figure 2, table 1, it shows the comparison from the denoising ability and FOM to various filtering algorithm. 1. the denoising ability .The mean filter has a superior noise smoothing ability; Median filter is different from the mean filter, which will not cause the fuzzy boundaries of SAR image in the attenuation of noise, also can be better to isolate speckle noise; Lee filter effect is better than median filter but the noise of the edge is still obvious; Frost eliminate the speckle noise very well, but there are still some spots.
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