Search results

This statement can be confirmed by the statistical data indicating that in the last decade the global production of primary aluminium has been systematically growing (around 5% per year).
Parts made from aluminium alloys often replace those made from steel - especially in the automotive industry, where the mass reduction results in fuel savings, which is beneficial not only for economic reasons but also has a positive impact on the natural environment (reduction of CO2 and harmful substances emission to the atmosphere).
Even at the design stage, a special attention is paid to ensure high mechanical strength with simultaneous weight reduction.
They concluded that increased defect density in the crystal structure caused by plastic deformation would enhance the diffusion distance of Si considerably and therefore result in the formation of a more evident peak for the GP zones, the anticipation of the metastable β”/β’ peak temperatures and the reduction of Si and Mg2Si phases amount that eventually forms.
The diffraction data were collected over 2ϴ range of 30-100° with a step size of 0.01 and the counting time per step 5s.

The authors of [9-12] notes, that slight overheating of alloys above the liquidus line leads to a significant reduction of complexes in a liquid.
An increase in the cooling rate to 104 K/s is accompanied by a significant reduction in the dimensions and volume fraction of primary aluminum crystals to 10 – 15 % (Fig. 1).
An increase in the rate of cooling of alloys contributes to the subsequent reduction of both the size and volume fraction of primary crystals of the Al2Cu phase.A similar situation was observed in the study of the microstructure after overheating of hypereutectic alloys to a temperature of 100 K above the liquidus line, namely, further reduction of the measurements of the primary phase of Al2Cu and an increase in the volume fraction of the eutectic.
Subsequent cooling of this sample on the thermogram recorded the formation of primary crystals of the Al2Cu phase at a temperature of 836 K, while the second at a temperature of 817 K corresponds to the formation of the eutectic, which correlates with the data of the diagram of the state of the Al-Cu system (Fig. 8, b).
At present, data on corrosion resistance of aluminum and its alloys are known [18-22].

A reduction in the elasticity modulus of the epoxy resin and the nanocomposites with the increase in temperature was verified.
In other case, the reduction was 17.63 (%) with the same length and 1.8% of NiTi volume fraction.
This work attributed the reduction of elasticity modulus to the softening of matrix, and the fraction of the NiTi in the composition of the sample.
The convective heat transfer coefficient is obtained by comparing the experimental data of temperature versus time with those obtained in the Ansys CFX software.
Thermocouple locations Numerical Experimental Total Error (%) Tmax(ºC) Tmin(ºC) Tmax(ºC) Tmin(ºC) Tmax Tmin 1 53.09 41.79 50.375 43.596 5.39 4.14 2 51.51 41.97 50.375 43.596 2.25 3.72 3 50.20 41.79 50.375 43.596 0.35 4.14 For cases evaluated, the total error is below 6%, when compared to the maximum temperature and the experimental data obtained at the final of the simulation, therefore, the mathematical model shows considerable precision.

Electronic business activities has a large amount of data transmission and storage, data transmission on Internet technology, and the Internet is a natural vulnerability and insecurity of the network, the data is easy to lose and intercepted.
Enterprises in the electronic commerce activity generates large amounts of data is that they carry out non-stop operation of an important support, product data, customer relationship management are related to the huge data base.
Digital signature is a user uses a private key of the original data is encrypted data obtained from Hashi abstract.
Encryption technology is the electronic commerce takes the main security measures, is the most commonly used security means, using technical means to important data into code (encryption) transmission, after arriving at the destination with the same or different means reduction (decryption).
Influence of data packet forwarding speed of three main factors: link transmission speed, the router ability of data processing and routing lookup speed.

This electrocatalytic effect is detected normally by the reduction current increase (Ired) and the oxidation current decrease (Iox) of the typical polyoxometalates redox processes.
A DMAX RigaKu 2200 diffractometer with a graphite secondary monochromator is used to obtain data regarding the NHM crystalline nature.
Nevertheless, the presence of such nanoparticles is confirmed, in good agreement with XRD data, and the typical vibrational modes of the SiW12 Keggin structure (979 cm-1 for Si-O, 923 cm-1 for W=O, 877 cm-1 from W-O vertex, and 778cm-1 from W-O edge) are marked with an asterisk for MH3 with some shifts suggesting the interaction with the NTS matrix [40].
However, as shown in figures 4b) and 4c, in sample MH4 and especially in sample MH5 the dispersion is suppressed and the nanoparticles agglomerate although the size of the nanoparticles is retained, in agreement with XRD data.
The main diffraction peaks of this oxide are detected between 2q = 22° and 29° (JCPDS data 32-1395, 33-1387, 20-1324, and 20-1323) as well as the main peak of the NTS matrix observed in Fig. 1, suggesting its nanoscale or amorphous nature making it hard to detect.

The theory is that delaminating a complex surface 3D digital model along the contour line, and forming a series of section 2D data, then doing plastic forming from the top to the bottom level by level and part by part according to the section 2D data.
Under the control of computer, the forming head mounted on a 3-axis joint linking CNC machine is moved to the top position of a model first and set a rolling reduction for the sheet metal, and then plastic deformation is done along the contour line of the first level (shown in Fig. 1).
When the surface of the first level is finished, the forming head will be set another rolling reduction and be moved along the next contour line, and then the surface of the second level will be done.
Fig. 16 Fig. 17 The specific data of machine tools automatic programming is below, but it’s too long to show all in this article, so a small part of program at beginning is cut out to show the data

The results of creep of neat RPC and its composites are shown in Fig. 2, which are obtained by averaging the data of three parallel tests carried out under a constant tensile stress of 10 MPa. 2 3 1 Fig. 2.
The data obtained testify that addition of 10 wt. % of EVAc considerably increases creep of the investigated materials.
Dots — experimental data; lines — approximations according to Eqs. (1) and (2).
Corresponding creep data in these coordinates are shown in Fig. 3, from which one can conclude that the experimental points are really arranged along straight lines.
Decomposition of organic modifier in clays can lead to discoloration of polymers as well as reduction in modification efficiency, especially after multiple reprocessing steps, what is unavoidable during recycling.

Recent developments in the fusion materials program are focused on adjusting the chemical composition to achieve low activation after irradiation as well as on the reduction of the shift of the ductile–brittle transition temperature after irradiation.
Up to now, published data on the fatigue properties of RAFM steels is relatively limited.
Comparison with international data depicted in Fig. 3(a) indicates that the LCF properties of indigenous RAFM steels are close to the international data.
(a) (b) Fig. 2 Comparison of cyclic stress response curves of RAFM steels with varying W and Ta contents tested at a constant strain rate (3×10-3 s-1) [11] (a) and comparison of fatigue life of RAFM steels with modified 9Cr-1Mo ferritic steel at 823 K (550oC) (b) (a) (b) Fig. 3 Comparison of fatigue of Indian RAFM steels with international data [11] (a) and effect of tungsten and tantalum on cyclic stress-strain curves of RAFM steels at 823 K (550oC) and strain rate 3×10-3 s-1 (b).
Hence in the intermediate temperature range beyond 473 K to about 773 K (500oC), where oxidation effects are not predominant, life reduction with increasing temperature has been attributed to the effects of DSA.

Disaster reduction technologies based on digital information means of Binhai Industrial Park.
We use this technology to ensure the inherent risk index, social risk index and management measures risk indicator, mainly through a large number of experimental scene simulation and data statistical analysis, with a new risk assessment method-ARAMIS.
Monitoring and warning, the technology is the basis of risk assessment, by data information collection, arrangement and analysis.
In addition, we should integrate and make use of the monitoring and management information technology for the coastal zone industrial disasters sources, and research the fast forecast system of dangerous goods leakage, based on the GPS data transmission, GIS visualization technology, as well as perfect the decision support system of data processing and monitoring management for industrial disasters sources.
[3] Ruobo Wang, “Disaster Chain of Urban Land Subsidence in Tianjin,” Meteorology and Disaster Reduction Research, Vol31 No1,pp. 54-60,Mar,2008(In Chinese)

For example, a study conducted by Li[1] has applied wavelet transform to decomposition, noise reduction and reconstruction in a set of traffic flow time series collected from several detectors in signalized related intersections group.
Thus, situations occur where traffic arrives at the downstream randomly, contributing to the reduction of coordination control and adjacent intersection correlations.
The detailed field data collection efforts was performed on four adjacent intersections in the city of Chuzhou to collect data on signal timing, volumes of different movements, geometric properties and platoon characteristics.
Simulation Evaluation The field and simulation data were used along with guideline elements to determine where interconnection of a series of isolated signal is desired.
The field and simulation data collected were used to verify the guidelines established to evaluate whether signal interconnection is helpful in improving traffic operation through isolated intersections.